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linux/fs/xfs/libxfs/xfs_bmap.c
Darrick J. Wong 6d8a45ce29 xfs: don't screw up direct writes when freesp is fragmented 
xfs_bmap_btalloc is given a range of file offset blocks that must be
allocated to some data/attr/cow fork.  If the fork has an extent size
hint associated with it, the request will be enlarged on both ends to
try to satisfy the alignment hint.  If free space is fragmentated,
sometimes we can allocate some blocks but not enough to fulfill any of
the requested range.  Since bmapi_allocate always trims the new extent
mapping to match the originally requested range, this results in
bmapi_write returning zero and no mapping.

The consequences of this vary -- buffered writes will simply re-call
bmapi_write until it can satisfy at least one block from the original
request.  Direct IO overwrites notice nmaps == 0 and return -ENOSPC
through the dio mechanism out to userspace with the weird result that
writes fail even when we have enough space because the ENOSPC return
overrides any partial write status.  For direct CoW writes the situation
was disastrous because nobody notices us returning an invalid zero-length
wrong-offset mapping to iomap and the write goes off into space.

Therefore, if free space is so fragmented that we managed to allocate
some space but not enough to map into even a single block of the
original allocation request range, we should break the alignment hint in
order to guarantee at least some forward progress for the direct write.
If we return a short allocation to iomap_apply it'll call back about the
remaining blocks.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
2018-01-29 07:27:24 -08:00

6157 lines
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/*
* Copyright (c) 2000-2006 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_bit.h"
#include "xfs_sb.h"
#include "xfs_mount.h"
#include "xfs_defer.h"
#include "xfs_da_format.h"
#include "xfs_da_btree.h"
#include "xfs_dir2.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
#include "xfs_trans.h"
#include "xfs_inode_item.h"
#include "xfs_extfree_item.h"
#include "xfs_alloc.h"
#include "xfs_bmap.h"
#include "xfs_bmap_util.h"
#include "xfs_bmap_btree.h"
#include "xfs_rtalloc.h"
#include "xfs_errortag.h"
#include "xfs_error.h"
#include "xfs_quota.h"
#include "xfs_trans_space.h"
#include "xfs_buf_item.h"
#include "xfs_trace.h"
#include "xfs_symlink.h"
#include "xfs_attr_leaf.h"
#include "xfs_filestream.h"
#include "xfs_rmap.h"
#include "xfs_ag_resv.h"
#include "xfs_refcount.h"
#include "xfs_icache.h"
kmem_zone_t *xfs_bmap_free_item_zone;
/*
* Miscellaneous helper functions
*/
/*
* Compute and fill in the value of the maximum depth of a bmap btree
* in this filesystem. Done once, during mount.
*/
void
xfs_bmap_compute_maxlevels(
xfs_mount_t *mp, /* file system mount structure */
int whichfork) /* data or attr fork */
{
int level; /* btree level */
uint maxblocks; /* max blocks at this level */
uint maxleafents; /* max leaf entries possible */
int maxrootrecs; /* max records in root block */
int minleafrecs; /* min records in leaf block */
int minnoderecs; /* min records in node block */
int sz; /* root block size */
/*
* The maximum number of extents in a file, hence the maximum
* number of leaf entries, is controlled by the type of di_nextents
* (a signed 32-bit number, xfs_extnum_t), or by di_anextents
* (a signed 16-bit number, xfs_aextnum_t).
*
* Note that we can no longer assume that if we are in ATTR1 that
* the fork offset of all the inodes will be
* (xfs_default_attroffset(ip) >> 3) because we could have mounted
* with ATTR2 and then mounted back with ATTR1, keeping the
* di_forkoff's fixed but probably at various positions. Therefore,
* for both ATTR1 and ATTR2 we have to assume the worst case scenario
* of a minimum size available.
*/
if (whichfork == XFS_DATA_FORK) {
maxleafents = MAXEXTNUM;
sz = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
} else {
maxleafents = MAXAEXTNUM;
sz = XFS_BMDR_SPACE_CALC(MINABTPTRS);
}
maxrootrecs = xfs_bmdr_maxrecs(sz, 0);
minleafrecs = mp->m_bmap_dmnr[0];
minnoderecs = mp->m_bmap_dmnr[1];
maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
for (level = 1; maxblocks > 1; level++) {
if (maxblocks <= maxrootrecs)
maxblocks = 1;
else
maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
}
mp->m_bm_maxlevels[whichfork] = level;
}
STATIC int /* error */
xfs_bmbt_lookup_eq(
struct xfs_btree_cur *cur,
struct xfs_bmbt_irec *irec,
int *stat) /* success/failure */
{
cur->bc_rec.b = *irec;
return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat);
}
STATIC int /* error */
xfs_bmbt_lookup_first(
struct xfs_btree_cur *cur,
int *stat) /* success/failure */
{
cur->bc_rec.b.br_startoff = 0;
cur->bc_rec.b.br_startblock = 0;
cur->bc_rec.b.br_blockcount = 0;
return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat);
}
/*
* Check if the inode needs to be converted to btree format.
*/
static inline bool xfs_bmap_needs_btree(struct xfs_inode *ip, int whichfork)
{
return whichfork != XFS_COW_FORK &&
XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_NEXTENTS(ip, whichfork) >
XFS_IFORK_MAXEXT(ip, whichfork);
}
/*
* Check if the inode should be converted to extent format.
*/
static inline bool xfs_bmap_wants_extents(struct xfs_inode *ip, int whichfork)
{
return whichfork != XFS_COW_FORK &&
XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
XFS_IFORK_NEXTENTS(ip, whichfork) <=
XFS_IFORK_MAXEXT(ip, whichfork);
}
/*
* Update the record referred to by cur to the value given by irec
* This either works (return 0) or gets an EFSCORRUPTED error.
*/
STATIC int
xfs_bmbt_update(
struct xfs_btree_cur *cur,
struct xfs_bmbt_irec *irec)
{
union xfs_btree_rec rec;
xfs_bmbt_disk_set_all(&rec.bmbt, irec);
return xfs_btree_update(cur, &rec);
}
/*
* Compute the worst-case number of indirect blocks that will be used
* for ip's delayed extent of length "len".
*/
STATIC xfs_filblks_t
xfs_bmap_worst_indlen(
xfs_inode_t *ip, /* incore inode pointer */
xfs_filblks_t len) /* delayed extent length */
{
int level; /* btree level number */
int maxrecs; /* maximum record count at this level */
xfs_mount_t *mp; /* mount structure */
xfs_filblks_t rval; /* return value */
mp = ip->i_mount;
maxrecs = mp->m_bmap_dmxr[0];
for (level = 0, rval = 0;
level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
level++) {
len += maxrecs - 1;
do_div(len, maxrecs);
rval += len;
if (len == 1)
return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
level - 1;
if (level == 0)
maxrecs = mp->m_bmap_dmxr[1];
}
return rval;
}
/*
* Calculate the default attribute fork offset for newly created inodes.
*/
uint
xfs_default_attroffset(
struct xfs_inode *ip)
{
struct xfs_mount *mp = ip->i_mount;
uint offset;
if (mp->m_sb.sb_inodesize == 256) {
offset = XFS_LITINO(mp, ip->i_d.di_version) -
XFS_BMDR_SPACE_CALC(MINABTPTRS);
} else {
offset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
}
ASSERT(offset < XFS_LITINO(mp, ip->i_d.di_version));
return offset;
}
/*
* Helper routine to reset inode di_forkoff field when switching
* attribute fork from local to extent format - we reset it where
* possible to make space available for inline data fork extents.
*/
STATIC void
xfs_bmap_forkoff_reset(
xfs_inode_t *ip,
int whichfork)
{
if (whichfork == XFS_ATTR_FORK &&
ip->i_d.di_format != XFS_DINODE_FMT_DEV &&
ip->i_d.di_format != XFS_DINODE_FMT_BTREE) {
uint dfl_forkoff = xfs_default_attroffset(ip) >> 3;
if (dfl_forkoff > ip->i_d.di_forkoff)
ip->i_d.di_forkoff = dfl_forkoff;
}
}
#ifdef DEBUG
STATIC struct xfs_buf *
xfs_bmap_get_bp(
struct xfs_btree_cur *cur,
xfs_fsblock_t bno)
{
struct xfs_log_item_desc *lidp;
int i;
if (!cur)
return NULL;
for (i = 0; i < XFS_BTREE_MAXLEVELS; i++) {
if (!cur->bc_bufs[i])
break;
if (XFS_BUF_ADDR(cur->bc_bufs[i]) == bno)
return cur->bc_bufs[i];
}
/* Chase down all the log items to see if the bp is there */
list_for_each_entry(lidp, &cur->bc_tp->t_items, lid_trans) {
struct xfs_buf_log_item *bip;
bip = (struct xfs_buf_log_item *)lidp->lid_item;
if (bip->bli_item.li_type == XFS_LI_BUF &&
XFS_BUF_ADDR(bip->bli_buf) == bno)
return bip->bli_buf;
}
return NULL;
}
STATIC void
xfs_check_block(
struct xfs_btree_block *block,
xfs_mount_t *mp,
int root,
short sz)
{
int i, j, dmxr;
__be64 *pp, *thispa; /* pointer to block address */
xfs_bmbt_key_t *prevp, *keyp;
ASSERT(be16_to_cpu(block->bb_level) > 0);
prevp = NULL;
for( i = 1; i <= xfs_btree_get_numrecs(block); i++) {
dmxr = mp->m_bmap_dmxr[0];
keyp = XFS_BMBT_KEY_ADDR(mp, block, i);
if (prevp) {
ASSERT(be64_to_cpu(prevp->br_startoff) <
be64_to_cpu(keyp->br_startoff));
}
prevp = keyp;
/*
* Compare the block numbers to see if there are dups.
*/
if (root)
pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, i, sz);
else
pp = XFS_BMBT_PTR_ADDR(mp, block, i, dmxr);
for (j = i+1; j <= be16_to_cpu(block->bb_numrecs); j++) {
if (root)
thispa = XFS_BMAP_BROOT_PTR_ADDR(mp, block, j, sz);
else
thispa = XFS_BMBT_PTR_ADDR(mp, block, j, dmxr);
if (*thispa == *pp) {
xfs_warn(mp, "%s: thispa(%d) == pp(%d) %Ld",
__func__, j, i,
(unsigned long long)be64_to_cpu(*thispa));
panic("%s: ptrs are equal in node\n",
__func__);
}
}
}
}
/*
* Check that the extents for the inode ip are in the right order in all
* btree leaves. THis becomes prohibitively expensive for large extent count
* files, so don't bother with inodes that have more than 10,000 extents in
* them. The btree record ordering checks will still be done, so for such large
* bmapbt constructs that is going to catch most corruptions.
*/
STATIC void
xfs_bmap_check_leaf_extents(
xfs_btree_cur_t *cur, /* btree cursor or null */
xfs_inode_t *ip, /* incore inode pointer */
int whichfork) /* data or attr fork */
{
struct xfs_btree_block *block; /* current btree block */
xfs_fsblock_t bno; /* block # of "block" */
xfs_buf_t *bp; /* buffer for "block" */
int error; /* error return value */
xfs_extnum_t i=0, j; /* index into the extents list */
xfs_ifork_t *ifp; /* fork structure */
int level; /* btree level, for checking */
xfs_mount_t *mp; /* file system mount structure */
__be64 *pp; /* pointer to block address */
xfs_bmbt_rec_t *ep; /* pointer to current extent */
xfs_bmbt_rec_t last = {0, 0}; /* last extent in prev block */
xfs_bmbt_rec_t *nextp; /* pointer to next extent */
int bp_release = 0;
if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE) {
return;
}
/* skip large extent count inodes */
if (ip->i_d.di_nextents > 10000)
return;
bno = NULLFSBLOCK;
mp = ip->i_mount;
ifp = XFS_IFORK_PTR(ip, whichfork);
block = ifp->if_broot;
/*
* Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
*/
level = be16_to_cpu(block->bb_level);
ASSERT(level > 0);
xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
bno = be64_to_cpu(*pp);
ASSERT(bno != NULLFSBLOCK);
ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
/*
* Go down the tree until leaf level is reached, following the first
* pointer (leftmost) at each level.
*/
while (level-- > 0) {
/* See if buf is in cur first */
bp_release = 0;
bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
if (!bp) {
bp_release = 1;
error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
XFS_BMAP_BTREE_REF,
&xfs_bmbt_buf_ops);
if (error)
goto error_norelse;
}
block = XFS_BUF_TO_BLOCK(bp);
if (level == 0)
break;
/*
* Check this block for basic sanity (increasing keys and
* no duplicate blocks).
*/
xfs_check_block(block, mp, 0, 0);
pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
bno = be64_to_cpu(*pp);
XFS_WANT_CORRUPTED_GOTO(mp,
xfs_verify_fsbno(mp, bno), error0);
if (bp_release) {
bp_release = 0;
xfs_trans_brelse(NULL, bp);
}
}
/*
* Here with bp and block set to the leftmost leaf node in the tree.
*/
i = 0;
/*
* Loop over all leaf nodes checking that all extents are in the right order.
*/
for (;;) {
xfs_fsblock_t nextbno;
xfs_extnum_t num_recs;
num_recs = xfs_btree_get_numrecs(block);
/*
* Read-ahead the next leaf block, if any.
*/
nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
/*
* Check all the extents to make sure they are OK.
* If we had a previous block, the last entry should
* conform with the first entry in this one.
*/
ep = XFS_BMBT_REC_ADDR(mp, block, 1);
if (i) {
ASSERT(xfs_bmbt_disk_get_startoff(&last) +
xfs_bmbt_disk_get_blockcount(&last) <=
xfs_bmbt_disk_get_startoff(ep));
}
for (j = 1; j < num_recs; j++) {
nextp = XFS_BMBT_REC_ADDR(mp, block, j + 1);
ASSERT(xfs_bmbt_disk_get_startoff(ep) +
xfs_bmbt_disk_get_blockcount(ep) <=
xfs_bmbt_disk_get_startoff(nextp));
ep = nextp;
}
last = *ep;
i += num_recs;
if (bp_release) {
bp_release = 0;
xfs_trans_brelse(NULL, bp);
}
bno = nextbno;
/*
* If we've reached the end, stop.
*/
if (bno == NULLFSBLOCK)
break;
bp_release = 0;
bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
if (!bp) {
bp_release = 1;
error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
XFS_BMAP_BTREE_REF,
&xfs_bmbt_buf_ops);
if (error)
goto error_norelse;
}
block = XFS_BUF_TO_BLOCK(bp);
}
return;
error0:
xfs_warn(mp, "%s: at error0", __func__);
if (bp_release)
xfs_trans_brelse(NULL, bp);
error_norelse:
xfs_warn(mp, "%s: BAD after btree leaves for %d extents",
__func__, i);
panic("%s: CORRUPTED BTREE OR SOMETHING", __func__);
return;
}
/*
* Validate that the bmbt_irecs being returned from bmapi are valid
* given the caller's original parameters. Specifically check the
* ranges of the returned irecs to ensure that they only extend beyond
* the given parameters if the XFS_BMAPI_ENTIRE flag was set.
*/
STATIC void
xfs_bmap_validate_ret(
xfs_fileoff_t bno,
xfs_filblks_t len,
int flags,
xfs_bmbt_irec_t *mval,
int nmap,
int ret_nmap)
{
int i; /* index to map values */
ASSERT(ret_nmap <= nmap);
for (i = 0; i < ret_nmap; i++) {
ASSERT(mval[i].br_blockcount > 0);
if (!(flags & XFS_BMAPI_ENTIRE)) {
ASSERT(mval[i].br_startoff >= bno);
ASSERT(mval[i].br_blockcount <= len);
ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
bno + len);
} else {
ASSERT(mval[i].br_startoff < bno + len);
ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
bno);
}
ASSERT(i == 0 ||
mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
mval[i].br_startoff);
ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
mval[i].br_startblock != HOLESTARTBLOCK);
ASSERT(mval[i].br_state == XFS_EXT_NORM ||
mval[i].br_state == XFS_EXT_UNWRITTEN);
}
}
#else
#define xfs_bmap_check_leaf_extents(cur, ip, whichfork) do { } while (0)
#define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap) do { } while (0)
#endif /* DEBUG */
/*
* bmap free list manipulation functions
*/
/*
* Add the extent to the list of extents to be free at transaction end.
* The list is maintained sorted (by block number).
*/
void
xfs_bmap_add_free(
struct xfs_mount *mp,
struct xfs_defer_ops *dfops,
xfs_fsblock_t bno,
xfs_filblks_t len,
struct xfs_owner_info *oinfo)
{
struct xfs_extent_free_item *new; /* new element */
#ifdef DEBUG
xfs_agnumber_t agno;
xfs_agblock_t agbno;
ASSERT(bno != NULLFSBLOCK);
ASSERT(len > 0);
ASSERT(len <= MAXEXTLEN);
ASSERT(!isnullstartblock(bno));
agno = XFS_FSB_TO_AGNO(mp, bno);
agbno = XFS_FSB_TO_AGBNO(mp, bno);
ASSERT(agno < mp->m_sb.sb_agcount);
ASSERT(agbno < mp->m_sb.sb_agblocks);
ASSERT(len < mp->m_sb.sb_agblocks);
ASSERT(agbno + len <= mp->m_sb.sb_agblocks);
#endif
ASSERT(xfs_bmap_free_item_zone != NULL);
new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
new->xefi_startblock = bno;
new->xefi_blockcount = (xfs_extlen_t)len;
if (oinfo)
new->xefi_oinfo = *oinfo;
else
xfs_rmap_skip_owner_update(&new->xefi_oinfo);
trace_xfs_bmap_free_defer(mp, XFS_FSB_TO_AGNO(mp, bno), 0,
XFS_FSB_TO_AGBNO(mp, bno), len);
xfs_defer_add(dfops, XFS_DEFER_OPS_TYPE_FREE, &new->xefi_list);
}
/*
* Inode fork format manipulation functions
*/
/*
* Transform a btree format file with only one leaf node, where the
* extents list will fit in the inode, into an extents format file.
* Since the file extents are already in-core, all we have to do is
* give up the space for the btree root and pitch the leaf block.
*/
STATIC int /* error */
xfs_bmap_btree_to_extents(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_btree_cur_t *cur, /* btree cursor */
int *logflagsp, /* inode logging flags */
int whichfork) /* data or attr fork */
{
/* REFERENCED */
struct xfs_btree_block *cblock;/* child btree block */
xfs_fsblock_t cbno; /* child block number */
xfs_buf_t *cbp; /* child block's buffer */
int error; /* error return value */
xfs_ifork_t *ifp; /* inode fork data */
xfs_mount_t *mp; /* mount point structure */
__be64 *pp; /* ptr to block address */
struct xfs_btree_block *rblock;/* root btree block */
struct xfs_owner_info oinfo;
mp = ip->i_mount;
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(whichfork != XFS_COW_FORK);
ASSERT(ifp->if_flags & XFS_IFEXTENTS);
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
rblock = ifp->if_broot;
ASSERT(be16_to_cpu(rblock->bb_level) == 1);
ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
ASSERT(xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0) == 1);
pp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, ifp->if_broot_bytes);
cbno = be64_to_cpu(*pp);
*logflagsp = 0;
#ifdef DEBUG
XFS_WANT_CORRUPTED_RETURN(cur->bc_mp,
xfs_btree_check_lptr(cur, cbno, 1));
#endif
error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp, XFS_BMAP_BTREE_REF,
&xfs_bmbt_buf_ops);
if (error)
return error;
cblock = XFS_BUF_TO_BLOCK(cbp);
if ((error = xfs_btree_check_block(cur, cblock, 0, cbp)))
return error;
xfs_rmap_ino_bmbt_owner(&oinfo, ip->i_ino, whichfork);
xfs_bmap_add_free(mp, cur->bc_private.b.dfops, cbno, 1, &oinfo);
ip->i_d.di_nblocks--;
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
xfs_trans_binval(tp, cbp);
if (cur->bc_bufs[0] == cbp)
cur->bc_bufs[0] = NULL;
xfs_iroot_realloc(ip, -1, whichfork);
ASSERT(ifp->if_broot == NULL);
ASSERT((ifp->if_flags & XFS_IFBROOT) == 0);
XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
*logflagsp = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
return 0;
}
/*
* Convert an extents-format file into a btree-format file.
* The new file will have a root block (in the inode) and a single child block.
*/
STATIC int /* error */
xfs_bmap_extents_to_btree(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first-block-allocated */
struct xfs_defer_ops *dfops, /* blocks freed in xaction */
xfs_btree_cur_t **curp, /* cursor returned to caller */
int wasdel, /* converting a delayed alloc */
int *logflagsp, /* inode logging flags */
int whichfork) /* data or attr fork */
{
struct xfs_btree_block *ablock; /* allocated (child) bt block */
xfs_buf_t *abp; /* buffer for ablock */
xfs_alloc_arg_t args; /* allocation arguments */
xfs_bmbt_rec_t *arp; /* child record pointer */
struct xfs_btree_block *block; /* btree root block */
xfs_btree_cur_t *cur; /* bmap btree cursor */
int error; /* error return value */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_bmbt_key_t *kp; /* root block key pointer */
xfs_mount_t *mp; /* mount structure */
xfs_bmbt_ptr_t *pp; /* root block address pointer */
struct xfs_iext_cursor icur;
struct xfs_bmbt_irec rec;
xfs_extnum_t cnt = 0;
mp = ip->i_mount;
ASSERT(whichfork != XFS_COW_FORK);
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS);
/*
* Make space in the inode incore.
*/
xfs_iroot_realloc(ip, 1, whichfork);
ifp->if_flags |= XFS_IFBROOT;
/*
* Fill in the root.
*/
block = ifp->if_broot;
xfs_btree_init_block_int(mp, block, XFS_BUF_DADDR_NULL,
XFS_BTNUM_BMAP, 1, 1, ip->i_ino,
XFS_BTREE_LONG_PTRS);
/*
* Need a cursor. Can't allocate until bb_level is filled in.
*/
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
cur->bc_private.b.firstblock = *firstblock;
cur->bc_private.b.dfops = dfops;
cur->bc_private.b.flags = wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
/*
* Convert to a btree with two levels, one record in root.
*/
XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_BTREE);
memset(&args, 0, sizeof(args));
args.tp = tp;
args.mp = mp;
xfs_rmap_ino_bmbt_owner(&args.oinfo, ip->i_ino, whichfork);
args.firstblock = *firstblock;
if (*firstblock == NULLFSBLOCK) {
args.type = XFS_ALLOCTYPE_START_BNO;
args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
} else if (dfops->dop_low) {
args.type = XFS_ALLOCTYPE_START_BNO;
args.fsbno = *firstblock;
} else {
args.type = XFS_ALLOCTYPE_NEAR_BNO;
args.fsbno = *firstblock;
}
args.minlen = args.maxlen = args.prod = 1;
args.wasdel = wasdel;
*logflagsp = 0;
if ((error = xfs_alloc_vextent(&args))) {
xfs_iroot_realloc(ip, -1, whichfork);
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
return error;
}
if (WARN_ON_ONCE(args.fsbno == NULLFSBLOCK)) {
xfs_iroot_realloc(ip, -1, whichfork);
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
return -ENOSPC;
}
/*
* Allocation can't fail, the space was reserved.
*/
ASSERT(*firstblock == NULLFSBLOCK ||
args.agno >= XFS_FSB_TO_AGNO(mp, *firstblock));
*firstblock = cur->bc_private.b.firstblock = args.fsbno;
cur->bc_private.b.allocated++;
ip->i_d.di_nblocks++;
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0);
/*
* Fill in the child block.
*/
abp->b_ops = &xfs_bmbt_buf_ops;
ablock = XFS_BUF_TO_BLOCK(abp);
xfs_btree_init_block_int(mp, ablock, abp->b_bn,
XFS_BTNUM_BMAP, 0, 0, ip->i_ino,
XFS_BTREE_LONG_PTRS);
for_each_xfs_iext(ifp, &icur, &rec) {
if (isnullstartblock(rec.br_startblock))
continue;
arp = XFS_BMBT_REC_ADDR(mp, ablock, 1 + cnt);
xfs_bmbt_disk_set_all(arp, &rec);
cnt++;
}
ASSERT(cnt == XFS_IFORK_NEXTENTS(ip, whichfork));
xfs_btree_set_numrecs(ablock, cnt);
/*
* Fill in the root key and pointer.
*/
kp = XFS_BMBT_KEY_ADDR(mp, block, 1);
arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp));
pp = XFS_BMBT_PTR_ADDR(mp, block, 1, xfs_bmbt_get_maxrecs(cur,
be16_to_cpu(block->bb_level)));
*pp = cpu_to_be64(args.fsbno);
/*
* Do all this logging at the end so that
* the root is at the right level.
*/
xfs_btree_log_block(cur, abp, XFS_BB_ALL_BITS);
xfs_btree_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs));
ASSERT(*curp == NULL);
*curp = cur;
*logflagsp = XFS_ILOG_CORE | xfs_ilog_fbroot(whichfork);
return 0;
}
/*
* Convert a local file to an extents file.
* This code is out of bounds for data forks of regular files,
* since the file data needs to get logged so things will stay consistent.
* (The bmap-level manipulations are ok, though).
*/
void
xfs_bmap_local_to_extents_empty(
struct xfs_inode *ip,
int whichfork)
{
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(whichfork != XFS_COW_FORK);
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
ASSERT(ifp->if_bytes == 0);
ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);
xfs_bmap_forkoff_reset(ip, whichfork);
ifp->if_flags &= ~XFS_IFINLINE;
ifp->if_flags |= XFS_IFEXTENTS;
ifp->if_u1.if_root = NULL;
ifp->if_height = 0;
XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
}
STATIC int /* error */
xfs_bmap_local_to_extents(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first block allocated in xaction */
xfs_extlen_t total, /* total blocks needed by transaction */
int *logflagsp, /* inode logging flags */
int whichfork,
void (*init_fn)(struct xfs_trans *tp,
struct xfs_buf *bp,
struct xfs_inode *ip,
struct xfs_ifork *ifp))
{
int error = 0;
int flags; /* logging flags returned */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_alloc_arg_t args; /* allocation arguments */
xfs_buf_t *bp; /* buffer for extent block */
struct xfs_bmbt_irec rec;
struct xfs_iext_cursor icur;
/*
* We don't want to deal with the case of keeping inode data inline yet.
* So sending the data fork of a regular inode is invalid.
*/
ASSERT(!(S_ISREG(VFS_I(ip)->i_mode) && whichfork == XFS_DATA_FORK));
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
if (!ifp->if_bytes) {
xfs_bmap_local_to_extents_empty(ip, whichfork);
flags = XFS_ILOG_CORE;
goto done;
}
flags = 0;
error = 0;
ASSERT((ifp->if_flags & (XFS_IFINLINE|XFS_IFEXTENTS)) == XFS_IFINLINE);
memset(&args, 0, sizeof(args));
args.tp = tp;
args.mp = ip->i_mount;
xfs_rmap_ino_owner(&args.oinfo, ip->i_ino, whichfork, 0);
args.firstblock = *firstblock;
/*
* Allocate a block. We know we need only one, since the
* file currently fits in an inode.
*/
if (*firstblock == NULLFSBLOCK) {
args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
args.type = XFS_ALLOCTYPE_START_BNO;
} else {
args.fsbno = *firstblock;
args.type = XFS_ALLOCTYPE_NEAR_BNO;
}
args.total = total;
args.minlen = args.maxlen = args.prod = 1;
error = xfs_alloc_vextent(&args);
if (error)
goto done;
/* Can't fail, the space was reserved. */
ASSERT(args.fsbno != NULLFSBLOCK);
ASSERT(args.len == 1);
*firstblock = args.fsbno;
bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0);
/*
* Initialize the block, copy the data and log the remote buffer.
*
* The callout is responsible for logging because the remote format
* might differ from the local format and thus we don't know how much to
* log here. Note that init_fn must also set the buffer log item type
* correctly.
*/
init_fn(tp, bp, ip, ifp);
/* account for the change in fork size */
xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
xfs_bmap_local_to_extents_empty(ip, whichfork);
flags |= XFS_ILOG_CORE;
ifp->if_u1.if_root = NULL;
ifp->if_height = 0;
rec.br_startoff = 0;
rec.br_startblock = args.fsbno;
rec.br_blockcount = 1;
rec.br_state = XFS_EXT_NORM;
xfs_iext_first(ifp, &icur);
xfs_iext_insert(ip, &icur, &rec, 0);
XFS_IFORK_NEXT_SET(ip, whichfork, 1);
ip->i_d.di_nblocks = 1;
xfs_trans_mod_dquot_byino(tp, ip,
XFS_TRANS_DQ_BCOUNT, 1L);
flags |= xfs_ilog_fext(whichfork);
done:
*logflagsp = flags;
return error;
}
/*
* Called from xfs_bmap_add_attrfork to handle btree format files.
*/
STATIC int /* error */
xfs_bmap_add_attrfork_btree(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first block allocated */
struct xfs_defer_ops *dfops, /* blocks to free at commit */
int *flags) /* inode logging flags */
{
xfs_btree_cur_t *cur; /* btree cursor */
int error; /* error return value */
xfs_mount_t *mp; /* file system mount struct */
int stat; /* newroot status */
mp = ip->i_mount;
if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip))
*flags |= XFS_ILOG_DBROOT;
else {
cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK);
cur->bc_private.b.dfops = dfops;
cur->bc_private.b.firstblock = *firstblock;
error = xfs_bmbt_lookup_first(cur, &stat);
if (error)
goto error0;
/* must be at least one entry */
XFS_WANT_CORRUPTED_GOTO(mp, stat == 1, error0);
if ((error = xfs_btree_new_iroot(cur, flags, &stat)))
goto error0;
if (stat == 0) {
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
return -ENOSPC;
}
*firstblock = cur->bc_private.b.firstblock;
cur->bc_private.b.allocated = 0;
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
}
return 0;
error0:
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
return error;
}
/*
* Called from xfs_bmap_add_attrfork to handle extents format files.
*/
STATIC int /* error */
xfs_bmap_add_attrfork_extents(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first block allocated */
struct xfs_defer_ops *dfops, /* blocks to free at commit */
int *flags) /* inode logging flags */
{
xfs_btree_cur_t *cur; /* bmap btree cursor */
int error; /* error return value */
if (ip->i_d.di_nextents * sizeof(xfs_bmbt_rec_t) <= XFS_IFORK_DSIZE(ip))
return 0;
cur = NULL;
error = xfs_bmap_extents_to_btree(tp, ip, firstblock, dfops, &cur, 0,
flags, XFS_DATA_FORK);
if (cur) {
cur->bc_private.b.allocated = 0;
xfs_btree_del_cursor(cur,
error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
}
return error;
}
/*
* Called from xfs_bmap_add_attrfork to handle local format files. Each
* different data fork content type needs a different callout to do the
* conversion. Some are basic and only require special block initialisation
* callouts for the data formating, others (directories) are so specialised they
* handle everything themselves.
*
* XXX (dgc): investigate whether directory conversion can use the generic
* formatting callout. It should be possible - it's just a very complex
* formatter.
*/
STATIC int /* error */
xfs_bmap_add_attrfork_local(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_fsblock_t *firstblock, /* first block allocated */
struct xfs_defer_ops *dfops, /* blocks to free at commit */
int *flags) /* inode logging flags */
{
xfs_da_args_t dargs; /* args for dir/attr code */
if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
return 0;
if (S_ISDIR(VFS_I(ip)->i_mode)) {
memset(&dargs, 0, sizeof(dargs));
dargs.geo = ip->i_mount->m_dir_geo;
dargs.dp = ip;
dargs.firstblock = firstblock;
dargs.dfops = dfops;
dargs.total = dargs.geo->fsbcount;
dargs.whichfork = XFS_DATA_FORK;
dargs.trans = tp;
return xfs_dir2_sf_to_block(&dargs);
}
if (S_ISLNK(VFS_I(ip)->i_mode))
return xfs_bmap_local_to_extents(tp, ip, firstblock, 1,
flags, XFS_DATA_FORK,
xfs_symlink_local_to_remote);
/* should only be called for types that support local format data */
ASSERT(0);
return -EFSCORRUPTED;
}
/*
* Convert inode from non-attributed to attributed.
* Must not be in a transaction, ip must not be locked.
*/
int /* error code */
xfs_bmap_add_attrfork(
xfs_inode_t *ip, /* incore inode pointer */
int size, /* space new attribute needs */
int rsvd) /* xact may use reserved blks */
{
xfs_fsblock_t firstblock; /* 1st block/ag allocated */
struct xfs_defer_ops dfops; /* freed extent records */
xfs_mount_t *mp; /* mount structure */
xfs_trans_t *tp; /* transaction pointer */
int blks; /* space reservation */
int version = 1; /* superblock attr version */
int logflags; /* logging flags */
int error; /* error return value */
ASSERT(XFS_IFORK_Q(ip) == 0);
mp = ip->i_mount;
ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
blks = XFS_ADDAFORK_SPACE_RES(mp);
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_addafork, blks, 0,
rsvd ? XFS_TRANS_RESERVE : 0, &tp);
if (error)
return error;
xfs_ilock(ip, XFS_ILOCK_EXCL);
error = xfs_trans_reserve_quota_nblks(tp, ip, blks, 0, rsvd ?
XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
XFS_QMOPT_RES_REGBLKS);
if (error)
goto trans_cancel;
if (XFS_IFORK_Q(ip))
goto trans_cancel;
if (ip->i_d.di_anextents != 0) {
error = -EFSCORRUPTED;
goto trans_cancel;
}
if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS) {
/*
* For inodes coming from pre-6.2 filesystems.
*/
ASSERT(ip->i_d.di_aformat == 0);
ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
}
xfs_trans_ijoin(tp, ip, 0);
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
switch (ip->i_d.di_format) {
case XFS_DINODE_FMT_DEV:
ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
break;
case XFS_DINODE_FMT_LOCAL:
case XFS_DINODE_FMT_EXTENTS:
case XFS_DINODE_FMT_BTREE:
ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
if (!ip->i_d.di_forkoff)
ip->i_d.di_forkoff = xfs_default_attroffset(ip) >> 3;
else if (mp->m_flags & XFS_MOUNT_ATTR2)
version = 2;
break;
default:
ASSERT(0);
error = -EINVAL;
goto trans_cancel;
}
ASSERT(ip->i_afp == NULL);
ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
ip->i_afp->if_flags = XFS_IFEXTENTS;
logflags = 0;
xfs_defer_init(&dfops, &firstblock);
switch (ip->i_d.di_format) {
case XFS_DINODE_FMT_LOCAL:
error = xfs_bmap_add_attrfork_local(tp, ip, &firstblock, &dfops,
&logflags);
break;
case XFS_DINODE_FMT_EXTENTS:
error = xfs_bmap_add_attrfork_extents(tp, ip, &firstblock,
&dfops, &logflags);
break;
case XFS_DINODE_FMT_BTREE:
error = xfs_bmap_add_attrfork_btree(tp, ip, &firstblock, &dfops,
&logflags);
break;
default:
error = 0;
break;
}
if (logflags)
xfs_trans_log_inode(tp, ip, logflags);
if (error)
goto bmap_cancel;
if (!xfs_sb_version_hasattr(&mp->m_sb) ||
(!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2)) {
bool log_sb = false;
spin_lock(&mp->m_sb_lock);
if (!xfs_sb_version_hasattr(&mp->m_sb)) {
xfs_sb_version_addattr(&mp->m_sb);
log_sb = true;
}
if (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2) {
xfs_sb_version_addattr2(&mp->m_sb);
log_sb = true;
}
spin_unlock(&mp->m_sb_lock);
if (log_sb)
xfs_log_sb(tp);
}
error = xfs_defer_finish(&tp, &dfops);
if (error)
goto bmap_cancel;
error = xfs_trans_commit(tp);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
bmap_cancel:
xfs_defer_cancel(&dfops);
trans_cancel:
xfs_trans_cancel(tp);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
}
/*
* Internal and external extent tree search functions.
*/
/*
* Read in extents from a btree-format inode.
*/
int
xfs_iread_extents(
struct xfs_trans *tp,
struct xfs_inode *ip,
int whichfork)
{
struct xfs_mount *mp = ip->i_mount;
int state = xfs_bmap_fork_to_state(whichfork);
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
xfs_extnum_t nextents = XFS_IFORK_NEXTENTS(ip, whichfork);
struct xfs_btree_block *block = ifp->if_broot;
struct xfs_iext_cursor icur;
struct xfs_bmbt_irec new;
xfs_fsblock_t bno;
struct xfs_buf *bp;
xfs_extnum_t i, j;
int level;
__be64 *pp;
int error;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
if (unlikely(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, mp);
return -EFSCORRUPTED;
}
/*
* Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
*/
level = be16_to_cpu(block->bb_level);
ASSERT(level > 0);
pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
bno = be64_to_cpu(*pp);
/*
* Go down the tree until leaf level is reached, following the first
* pointer (leftmost) at each level.
*/
while (level-- > 0) {
error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
XFS_BMAP_BTREE_REF, &xfs_bmbt_buf_ops);
if (error)
goto out;
block = XFS_BUF_TO_BLOCK(bp);
if (level == 0)
break;
pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
bno = be64_to_cpu(*pp);
XFS_WANT_CORRUPTED_GOTO(mp,
xfs_verify_fsbno(mp, bno), out_brelse);
xfs_trans_brelse(tp, bp);
}
/*
* Here with bp and block set to the leftmost leaf node in the tree.
*/
i = 0;
xfs_iext_first(ifp, &icur);
/*
* Loop over all leaf nodes. Copy information to the extent records.
*/
for (;;) {
xfs_bmbt_rec_t *frp;
xfs_fsblock_t nextbno;
xfs_extnum_t num_recs;
num_recs = xfs_btree_get_numrecs(block);
if (unlikely(i + num_recs > nextents)) {
ASSERT(i + num_recs <= nextents);
xfs_warn(ip->i_mount,
"corrupt dinode %Lu, (btree extents).",
(unsigned long long) ip->i_ino);
XFS_CORRUPTION_ERROR(__func__,
XFS_ERRLEVEL_LOW, ip->i_mount, block);
error = -EFSCORRUPTED;
goto out_brelse;
}
/*
* Read-ahead the next leaf block, if any.
*/
nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
if (nextbno != NULLFSBLOCK)
xfs_btree_reada_bufl(mp, nextbno, 1,
&xfs_bmbt_buf_ops);
/*
* Copy records into the extent records.
*/
frp = XFS_BMBT_REC_ADDR(mp, block, 1);
for (j = 0; j < num_recs; j++, frp++, i++) {
xfs_bmbt_disk_get_all(frp, &new);
if (!xfs_bmbt_validate_extent(mp, whichfork, &new)) {
XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
XFS_ERRLEVEL_LOW, mp);
error = -EFSCORRUPTED;
goto out_brelse;
}
xfs_iext_insert(ip, &icur, &new, state);
trace_xfs_read_extent(ip, &icur, state, _THIS_IP_);
xfs_iext_next(ifp, &icur);
}
xfs_trans_brelse(tp, bp);
bno = nextbno;
/*
* If we've reached the end, stop.
*/
if (bno == NULLFSBLOCK)
break;
error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
XFS_BMAP_BTREE_REF, &xfs_bmbt_buf_ops);
if (error)
goto out;
block = XFS_BUF_TO_BLOCK(bp);
}
if (i != XFS_IFORK_NEXTENTS(ip, whichfork)) {
error = -EFSCORRUPTED;
goto out;
}
ASSERT(i == xfs_iext_count(ifp));
ifp->if_flags |= XFS_IFEXTENTS;
return 0;
out_brelse:
xfs_trans_brelse(tp, bp);
out:
xfs_iext_destroy(ifp);
return error;
}
/*
* Returns the relative block number of the first unused block(s) in the given
* fork with at least "len" logically contiguous blocks free. This is the
* lowest-address hole if the fork has holes, else the first block past the end
* of fork. Return 0 if the fork is currently local (in-inode).
*/
int /* error */
xfs_bmap_first_unused(
struct xfs_trans *tp, /* transaction pointer */
struct xfs_inode *ip, /* incore inode */
xfs_extlen_t len, /* size of hole to find */
xfs_fileoff_t *first_unused, /* unused block */
int whichfork) /* data or attr fork */
{
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_bmbt_irec got;
struct xfs_iext_cursor icur;
xfs_fileoff_t lastaddr = 0;
xfs_fileoff_t lowest, max;
int error;
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE ||
XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ||
XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
*first_unused = 0;
return 0;
}
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
error = xfs_iread_extents(tp, ip, whichfork);
if (error)
return error;
}
lowest = max = *first_unused;
for_each_xfs_iext(ifp, &icur, &got) {
/*
* See if the hole before this extent will work.
*/
if (got.br_startoff >= lowest + len &&
got.br_startoff - max >= len)
break;
lastaddr = got.br_startoff + got.br_blockcount;
max = XFS_FILEOFF_MAX(lastaddr, lowest);
}
*first_unused = max;
return 0;
}
/*
* Returns the file-relative block number of the last block - 1 before
* last_block (input value) in the file.
* This is not based on i_size, it is based on the extent records.
* Returns 0 for local files, as they do not have extent records.
*/
int /* error */
xfs_bmap_last_before(
struct xfs_trans *tp, /* transaction pointer */
struct xfs_inode *ip, /* incore inode */
xfs_fileoff_t *last_block, /* last block */
int whichfork) /* data or attr fork */
{
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_bmbt_irec got;
struct xfs_iext_cursor icur;
int error;
switch (XFS_IFORK_FORMAT(ip, whichfork)) {
case XFS_DINODE_FMT_LOCAL:
*last_block = 0;
return 0;
case XFS_DINODE_FMT_BTREE:
case XFS_DINODE_FMT_EXTENTS:
break;
default:
return -EIO;
}
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
error = xfs_iread_extents(tp, ip, whichfork);
if (error)
return error;
}
if (!xfs_iext_lookup_extent_before(ip, ifp, last_block, &icur, &got))
*last_block = 0;
return 0;
}
int
xfs_bmap_last_extent(
struct xfs_trans *tp,
struct xfs_inode *ip,
int whichfork,
struct xfs_bmbt_irec *rec,
int *is_empty)
{
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_iext_cursor icur;
int error;
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
error = xfs_iread_extents(tp, ip, whichfork);
if (error)
return error;
}
xfs_iext_last(ifp, &icur);
if (!xfs_iext_get_extent(ifp, &icur, rec))
*is_empty = 1;
else
*is_empty = 0;
return 0;
}
/*
* Check the last inode extent to determine whether this allocation will result
* in blocks being allocated at the end of the file. When we allocate new data
* blocks at the end of the file which do not start at the previous data block,
* we will try to align the new blocks at stripe unit boundaries.
*
* Returns 1 in bma->aeof if the file (fork) is empty as any new write will be
* at, or past the EOF.
*/
STATIC int
xfs_bmap_isaeof(
struct xfs_bmalloca *bma,
int whichfork)
{
struct xfs_bmbt_irec rec;
int is_empty;
int error;
bma->aeof = false;
error = xfs_bmap_last_extent(NULL, bma->ip, whichfork, &rec,
&is_empty);
if (error)
return error;
if (is_empty) {
bma->aeof = true;
return 0;
}
/*
* Check if we are allocation or past the last extent, or at least into
* the last delayed allocated extent.
*/
bma->aeof = bma->offset >= rec.br_startoff + rec.br_blockcount ||
(bma->offset >= rec.br_startoff &&
isnullstartblock(rec.br_startblock));
return 0;
}
/*
* Returns the file-relative block number of the first block past eof in
* the file. This is not based on i_size, it is based on the extent records.
* Returns 0 for local files, as they do not have extent records.
*/
int
xfs_bmap_last_offset(
struct xfs_inode *ip,
xfs_fileoff_t *last_block,
int whichfork)
{
struct xfs_bmbt_irec rec;
int is_empty;
int error;
*last_block = 0;
if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL)
return 0;
if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
return -EIO;
error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, &is_empty);
if (error || is_empty)
return error;
*last_block = rec.br_startoff + rec.br_blockcount;
return 0;
}
/*
* Returns whether the selected fork of the inode has exactly one
* block or not. For the data fork we check this matches di_size,
* implying the file's range is 0..bsize-1.
*/
int /* 1=>1 block, 0=>otherwise */
xfs_bmap_one_block(
xfs_inode_t *ip, /* incore inode */
int whichfork) /* data or attr fork */
{
xfs_ifork_t *ifp; /* inode fork pointer */
int rval; /* return value */
xfs_bmbt_irec_t s; /* internal version of extent */
struct xfs_iext_cursor icur;
#ifndef DEBUG
if (whichfork == XFS_DATA_FORK)
return XFS_ISIZE(ip) == ip->i_mount->m_sb.sb_blocksize;
#endif /* !DEBUG */
if (XFS_IFORK_NEXTENTS(ip, whichfork) != 1)
return 0;
if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
return 0;
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(ifp->if_flags & XFS_IFEXTENTS);
xfs_iext_first(ifp, &icur);
xfs_iext_get_extent(ifp, &icur, &s);
rval = s.br_startoff == 0 && s.br_blockcount == 1;
if (rval && whichfork == XFS_DATA_FORK)
ASSERT(XFS_ISIZE(ip) == ip->i_mount->m_sb.sb_blocksize);
return rval;
}
/*
* Extent tree manipulation functions used during allocation.
*/
/*
* Convert a delayed allocation to a real allocation.
*/
STATIC int /* error */
xfs_bmap_add_extent_delay_real(
struct xfs_bmalloca *bma,
int whichfork)
{
struct xfs_bmbt_irec *new = &bma->got;
int error; /* error return value */
int i; /* temp state */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_fileoff_t new_endoff; /* end offset of new entry */
xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
/* left is 0, right is 1, prev is 2 */
int rval=0; /* return value (logging flags) */
int state = xfs_bmap_fork_to_state(whichfork);
xfs_filblks_t da_new; /* new count del alloc blocks used */
xfs_filblks_t da_old; /* old count del alloc blocks used */
xfs_filblks_t temp=0; /* value for da_new calculations */
int tmp_rval; /* partial logging flags */
struct xfs_mount *mp;
xfs_extnum_t *nextents;
struct xfs_bmbt_irec old;
mp = bma->ip->i_mount;
ifp = XFS_IFORK_PTR(bma->ip, whichfork);
ASSERT(whichfork != XFS_ATTR_FORK);
nextents = (whichfork == XFS_COW_FORK ? &bma->ip->i_cnextents :
&bma->ip->i_d.di_nextents);
ASSERT(!isnullstartblock(new->br_startblock));
ASSERT(!bma->cur ||
(bma->cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL));
XFS_STATS_INC(mp, xs_add_exlist);
#define LEFT r[0]
#define RIGHT r[1]
#define PREV r[2]
/*
* Set up a bunch of variables to make the tests simpler.
*/
xfs_iext_get_extent(ifp, &bma->icur, &PREV);
new_endoff = new->br_startoff + new->br_blockcount;
ASSERT(isnullstartblock(PREV.br_startblock));
ASSERT(PREV.br_startoff <= new->br_startoff);
ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
da_old = startblockval(PREV.br_startblock);
da_new = 0;
/*
* Set flags determining what part of the previous delayed allocation
* extent is being replaced by a real allocation.
*/
if (PREV.br_startoff == new->br_startoff)
state |= BMAP_LEFT_FILLING;
if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
state |= BMAP_RIGHT_FILLING;
/*
* Check and set flags if this segment has a left neighbor.
* Don't set contiguous if the combined extent would be too large.
*/
if (xfs_iext_peek_prev_extent(ifp, &bma->icur, &LEFT)) {
state |= BMAP_LEFT_VALID;
if (isnullstartblock(LEFT.br_startblock))
state |= BMAP_LEFT_DELAY;
}
if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
LEFT.br_state == new->br_state &&
LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
state |= BMAP_LEFT_CONTIG;
/*
* Check and set flags if this segment has a right neighbor.
* Don't set contiguous if the combined extent would be too large.
* Also check for all-three-contiguous being too large.
*/
if (xfs_iext_peek_next_extent(ifp, &bma->icur, &RIGHT)) {
state |= BMAP_RIGHT_VALID;
if (isnullstartblock(RIGHT.br_startblock))
state |= BMAP_RIGHT_DELAY;
}
if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
new_endoff == RIGHT.br_startoff &&
new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
new->br_state == RIGHT.br_state &&
new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
BMAP_RIGHT_FILLING)) !=
(BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
BMAP_RIGHT_FILLING) ||
LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
<= MAXEXTLEN))
state |= BMAP_RIGHT_CONTIG;
error = 0;
/*
* Switch out based on the FILLING and CONTIG state bits.
*/
switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Filling in all of a previously delayed allocation extent.
* The left and right neighbors are both contiguous with new.
*/
LEFT.br_blockcount += PREV.br_blockcount + RIGHT.br_blockcount;
xfs_iext_remove(bma->ip, &bma->icur, state);
xfs_iext_remove(bma->ip, &bma->icur, state);
xfs_iext_prev(ifp, &bma->icur);
xfs_iext_update_extent(bma->ip, state, &bma->icur, &LEFT);
(*nextents)--;
if (bma->cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(bma->cur, &RIGHT, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_btree_delete(bma->cur, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_btree_decrement(bma->cur, 0, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_bmbt_update(bma->cur, &LEFT);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
/*
* Filling in all of a previously delayed allocation extent.
* The left neighbor is contiguous, the right is not.
*/
old = LEFT;
LEFT.br_blockcount += PREV.br_blockcount;
xfs_iext_remove(bma->ip, &bma->icur, state);
xfs_iext_prev(ifp, &bma->icur);
xfs_iext_update_extent(bma->ip, state, &bma->icur, &LEFT);
if (bma->cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(bma->cur, &old, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_bmbt_update(bma->cur, &LEFT);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Filling in all of a previously delayed allocation extent.
* The right neighbor is contiguous, the left is not.
*/
PREV.br_startblock = new->br_startblock;
PREV.br_blockcount += RIGHT.br_blockcount;
xfs_iext_next(ifp, &bma->icur);
xfs_iext_remove(bma->ip, &bma->icur, state);
xfs_iext_prev(ifp, &bma->icur);
xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
if (bma->cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(bma->cur, &RIGHT, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_bmbt_update(bma->cur, &PREV);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
/*
* Filling in all of a previously delayed allocation extent.
* Neither the left nor right neighbors are contiguous with
* the new one.
*/
PREV.br_startblock = new->br_startblock;
PREV.br_state = new->br_state;
xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
(*nextents)++;
if (bma->cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(bma->cur, new, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
error = xfs_btree_insert(bma->cur, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
}
break;
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
/*
* Filling in the first part of a previous delayed allocation.
* The left neighbor is contiguous.
*/
old = LEFT;
temp = PREV.br_blockcount - new->br_blockcount;
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
startblockval(PREV.br_startblock));
LEFT.br_blockcount += new->br_blockcount;
PREV.br_blockcount = temp;
PREV.br_startoff += new->br_blockcount;
PREV.br_startblock = nullstartblock(da_new);
xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
xfs_iext_prev(ifp, &bma->icur);
xfs_iext_update_extent(bma->ip, state, &bma->icur, &LEFT);
if (bma->cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(bma->cur, &old, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_bmbt_update(bma->cur, &LEFT);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING:
/*
* Filling in the first part of a previous delayed allocation.
* The left neighbor is not contiguous.
*/
xfs_iext_update_extent(bma->ip, state, &bma->icur, new);
(*nextents)++;
if (bma->cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(bma->cur, new, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
error = xfs_btree_insert(bma->cur, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
}
if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
bma->firstblock, bma->dfops,
&bma->cur, 1, &tmp_rval, whichfork);
rval |= tmp_rval;
if (error)
goto done;
}
temp = PREV.br_blockcount - new->br_blockcount;
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
startblockval(PREV.br_startblock) -
(bma->cur ? bma->cur->bc_private.b.allocated : 0));
PREV.br_startoff = new_endoff;
PREV.br_blockcount = temp;
PREV.br_startblock = nullstartblock(da_new);
xfs_iext_next(ifp, &bma->icur);
xfs_iext_insert(bma->ip, &bma->icur, &PREV, state);
xfs_iext_prev(ifp, &bma->icur);
break;
case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Filling in the last part of a previous delayed allocation.
* The right neighbor is contiguous with the new allocation.
*/
old = RIGHT;
RIGHT.br_startoff = new->br_startoff;
RIGHT.br_startblock = new->br_startblock;
RIGHT.br_blockcount += new->br_blockcount;
if (bma->cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(bma->cur, &old, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_bmbt_update(bma->cur, &RIGHT);
if (error)
goto done;
}
temp = PREV.br_blockcount - new->br_blockcount;
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
startblockval(PREV.br_startblock));
PREV.br_blockcount = temp;
PREV.br_startblock = nullstartblock(da_new);
xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
xfs_iext_next(ifp, &bma->icur);
xfs_iext_update_extent(bma->ip, state, &bma->icur, &RIGHT);
break;
case BMAP_RIGHT_FILLING:
/*
* Filling in the last part of a previous delayed allocation.
* The right neighbor is not contiguous.
*/
xfs_iext_update_extent(bma->ip, state, &bma->icur, new);
(*nextents)++;
if (bma->cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(bma->cur, new, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
error = xfs_btree_insert(bma->cur, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
}
if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
bma->firstblock, bma->dfops, &bma->cur, 1,
&tmp_rval, whichfork);
rval |= tmp_rval;
if (error)
goto done;
}
temp = PREV.br_blockcount - new->br_blockcount;
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
startblockval(PREV.br_startblock) -
(bma->cur ? bma->cur->bc_private.b.allocated : 0));
PREV.br_startblock = nullstartblock(da_new);
PREV.br_blockcount = temp;
xfs_iext_insert(bma->ip, &bma->icur, &PREV, state);
xfs_iext_next(ifp, &bma->icur);
break;
case 0:
/*
* Filling in the middle part of a previous delayed allocation.
* Contiguity is impossible here.
* This case is avoided almost all the time.
*
* We start with a delayed allocation:
*
* +ddddddddddddddddddddddddddddddddddddddddddddddddddddddd+
* PREV @ idx
*
* and we are allocating:
* +rrrrrrrrrrrrrrrrr+
* new
*
* and we set it up for insertion as:
* +ddddddddddddddddddd+rrrrrrrrrrrrrrrrr+ddddddddddddddddd+
* new
* PREV @ idx LEFT RIGHT
* inserted at idx + 1
*/
old = PREV;
/* LEFT is the new middle */
LEFT = *new;
/* RIGHT is the new right */
RIGHT.br_state = PREV.br_state;
RIGHT.br_startoff = new_endoff;
RIGHT.br_blockcount =
PREV.br_startoff + PREV.br_blockcount - new_endoff;
RIGHT.br_startblock =
nullstartblock(xfs_bmap_worst_indlen(bma->ip,
RIGHT.br_blockcount));
/* truncate PREV */
PREV.br_blockcount = new->br_startoff - PREV.br_startoff;
PREV.br_startblock =
nullstartblock(xfs_bmap_worst_indlen(bma->ip,
PREV.br_blockcount));
xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
xfs_iext_next(ifp, &bma->icur);
xfs_iext_insert(bma->ip, &bma->icur, &RIGHT, state);
xfs_iext_insert(bma->ip, &bma->icur, &LEFT, state);
(*nextents)++;
if (bma->cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(bma->cur, new, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
error = xfs_btree_insert(bma->cur, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
}
if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
bma->firstblock, bma->dfops, &bma->cur,
1, &tmp_rval, whichfork);
rval |= tmp_rval;
if (error)
goto done;
}
da_new = startblockval(PREV.br_startblock) +
startblockval(RIGHT.br_startblock);
break;
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_LEFT_CONTIG:
case BMAP_RIGHT_CONTIG:
/*
* These cases are all impossible.
*/
ASSERT(0);
}
/* add reverse mapping */
error = xfs_rmap_map_extent(mp, bma->dfops, bma->ip, whichfork, new);
if (error)
goto done;
/* convert to a btree if necessary */
if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
int tmp_logflags; /* partial log flag return val */
ASSERT(bma->cur == NULL);
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
bma->firstblock, bma->dfops, &bma->cur,
da_old > 0, &tmp_logflags, whichfork);
bma->logflags |= tmp_logflags;
if (error)
goto done;
}
if (bma->cur) {
da_new += bma->cur->bc_private.b.allocated;
bma->cur->bc_private.b.allocated = 0;
}
/* adjust for changes in reserved delayed indirect blocks */
if (da_new != da_old) {
ASSERT(state == 0 || da_new < da_old);
error = xfs_mod_fdblocks(mp, (int64_t)(da_old - da_new),
false);
}
xfs_bmap_check_leaf_extents(bma->cur, bma->ip, whichfork);
done:
if (whichfork != XFS_COW_FORK)
bma->logflags |= rval;
return error;
#undef LEFT
#undef RIGHT
#undef PREV
}
/*
* Convert an unwritten allocation to a real allocation or vice versa.
*/
STATIC int /* error */
xfs_bmap_add_extent_unwritten_real(
struct xfs_trans *tp,
xfs_inode_t *ip, /* incore inode pointer */
int whichfork,
struct xfs_iext_cursor *icur,
xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
xfs_bmbt_irec_t *new, /* new data to add to file extents */
xfs_fsblock_t *first, /* pointer to firstblock variable */
struct xfs_defer_ops *dfops, /* list of extents to be freed */
int *logflagsp) /* inode logging flags */
{
xfs_btree_cur_t *cur; /* btree cursor */
int error; /* error return value */
int i; /* temp state */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_fileoff_t new_endoff; /* end offset of new entry */
xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
/* left is 0, right is 1, prev is 2 */
int rval=0; /* return value (logging flags) */
int state = xfs_bmap_fork_to_state(whichfork);
struct xfs_mount *mp = ip->i_mount;
struct xfs_bmbt_irec old;
*logflagsp = 0;
cur = *curp;
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(!isnullstartblock(new->br_startblock));
XFS_STATS_INC(mp, xs_add_exlist);
#define LEFT r[0]
#define RIGHT r[1]
#define PREV r[2]
/*
* Set up a bunch of variables to make the tests simpler.
*/
error = 0;
xfs_iext_get_extent(ifp, icur, &PREV);
ASSERT(new->br_state != PREV.br_state);
new_endoff = new->br_startoff + new->br_blockcount;
ASSERT(PREV.br_startoff <= new->br_startoff);
ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
/*
* Set flags determining what part of the previous oldext allocation
* extent is being replaced by a newext allocation.
*/
if (PREV.br_startoff == new->br_startoff)
state |= BMAP_LEFT_FILLING;
if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
state |= BMAP_RIGHT_FILLING;
/*
* Check and set flags if this segment has a left neighbor.
* Don't set contiguous if the combined extent would be too large.
*/
if (xfs_iext_peek_prev_extent(ifp, icur, &LEFT)) {
state |= BMAP_LEFT_VALID;
if (isnullstartblock(LEFT.br_startblock))
state |= BMAP_LEFT_DELAY;
}
if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
LEFT.br_state == new->br_state &&
LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
state |= BMAP_LEFT_CONTIG;
/*
* Check and set flags if this segment has a right neighbor.
* Don't set contiguous if the combined extent would be too large.
* Also check for all-three-contiguous being too large.
*/
if (xfs_iext_peek_next_extent(ifp, icur, &RIGHT)) {
state |= BMAP_RIGHT_VALID;
if (isnullstartblock(RIGHT.br_startblock))
state |= BMAP_RIGHT_DELAY;
}
if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
new_endoff == RIGHT.br_startoff &&
new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
new->br_state == RIGHT.br_state &&
new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
BMAP_RIGHT_FILLING)) !=
(BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
BMAP_RIGHT_FILLING) ||
LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
<= MAXEXTLEN))
state |= BMAP_RIGHT_CONTIG;
/*
* Switch out based on the FILLING and CONTIG state bits.
*/
switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Setting all of a previous oldext extent to newext.
* The left and right neighbors are both contiguous with new.
*/
LEFT.br_blockcount += PREV.br_blockcount + RIGHT.br_blockcount;
xfs_iext_remove(ip, icur, state);
xfs_iext_remove(ip, icur, state);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &LEFT);
XFS_IFORK_NEXT_SET(ip, whichfork,
XFS_IFORK_NEXTENTS(ip, whichfork) - 2);
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, &RIGHT, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
if ((error = xfs_btree_delete(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
if ((error = xfs_btree_decrement(cur, 0, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
if ((error = xfs_btree_delete(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
if ((error = xfs_btree_decrement(cur, 0, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_bmbt_update(cur, &LEFT);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
/*
* Setting all of a previous oldext extent to newext.
* The left neighbor is contiguous, the right is not.
*/
LEFT.br_blockcount += PREV.br_blockcount;
xfs_iext_remove(ip, icur, state);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &LEFT);
XFS_IFORK_NEXT_SET(ip, whichfork,
XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, &PREV, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
if ((error = xfs_btree_delete(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
if ((error = xfs_btree_decrement(cur, 0, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_bmbt_update(cur, &LEFT);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Setting all of a previous oldext extent to newext.
* The right neighbor is contiguous, the left is not.
*/
PREV.br_blockcount += RIGHT.br_blockcount;
PREV.br_state = new->br_state;
xfs_iext_next(ifp, icur);
xfs_iext_remove(ip, icur, state);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &PREV);
XFS_IFORK_NEXT_SET(ip, whichfork,
XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, &RIGHT, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
if ((error = xfs_btree_delete(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
if ((error = xfs_btree_decrement(cur, 0, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_bmbt_update(cur, &PREV);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
/*
* Setting all of a previous oldext extent to newext.
* Neither the left nor right neighbors are contiguous with
* the new one.
*/
PREV.br_state = new->br_state;
xfs_iext_update_extent(ip, state, icur, &PREV);
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(cur, new, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_bmbt_update(cur, &PREV);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
/*
* Setting the first part of a previous oldext extent to newext.
* The left neighbor is contiguous.
*/
LEFT.br_blockcount += new->br_blockcount;
old = PREV;
PREV.br_startoff += new->br_blockcount;
PREV.br_startblock += new->br_blockcount;
PREV.br_blockcount -= new->br_blockcount;
xfs_iext_update_extent(ip, state, icur, &PREV);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &LEFT);
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(cur, &old, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_bmbt_update(cur, &PREV);
if (error)
goto done;
error = xfs_btree_decrement(cur, 0, &i);
if (error)
goto done;
error = xfs_bmbt_update(cur, &LEFT);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING:
/*
* Setting the first part of a previous oldext extent to newext.
* The left neighbor is not contiguous.
*/
old = PREV;
PREV.br_startoff += new->br_blockcount;
PREV.br_startblock += new->br_blockcount;
PREV.br_blockcount -= new->br_blockcount;
xfs_iext_update_extent(ip, state, icur, &PREV);
xfs_iext_insert(ip, icur, new, state);
XFS_IFORK_NEXT_SET(ip, whichfork,
XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, &old, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_bmbt_update(cur, &PREV);
if (error)
goto done;
cur->bc_rec.b = *new;
if ((error = xfs_btree_insert(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
}
break;
case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Setting the last part of a previous oldext extent to newext.
* The right neighbor is contiguous with the new allocation.
*/
old = PREV;
PREV.br_blockcount -= new->br_blockcount;
RIGHT.br_startoff = new->br_startoff;
RIGHT.br_startblock = new->br_startblock;
RIGHT.br_blockcount += new->br_blockcount;
xfs_iext_update_extent(ip, state, icur, &PREV);
xfs_iext_next(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &RIGHT);
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(cur, &old, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_bmbt_update(cur, &PREV);
if (error)
goto done;
error = xfs_btree_increment(cur, 0, &i);
if (error)
goto done;
error = xfs_bmbt_update(cur, &RIGHT);
if (error)
goto done;
}
break;
case BMAP_RIGHT_FILLING:
/*
* Setting the last part of a previous oldext extent to newext.
* The right neighbor is not contiguous.
*/
old = PREV;
PREV.br_blockcount -= new->br_blockcount;
xfs_iext_update_extent(ip, state, icur, &PREV);
xfs_iext_next(ifp, icur);
xfs_iext_insert(ip, icur, new, state);
XFS_IFORK_NEXT_SET(ip, whichfork,
XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, &old, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_bmbt_update(cur, &PREV);
if (error)
goto done;
error = xfs_bmbt_lookup_eq(cur, new, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
if ((error = xfs_btree_insert(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
}
break;
case 0:
/*
* Setting the middle part of a previous oldext extent to
* newext. Contiguity is impossible here.
* One extent becomes three extents.
*/
old = PREV;
PREV.br_blockcount = new->br_startoff - PREV.br_startoff;
r[0] = *new;
r[1].br_startoff = new_endoff;
r[1].br_blockcount =
old.br_startoff + old.br_blockcount - new_endoff;
r[1].br_startblock = new->br_startblock + new->br_blockcount;
r[1].br_state = PREV.br_state;
xfs_iext_update_extent(ip, state, icur, &PREV);
xfs_iext_next(ifp, icur);
xfs_iext_insert(ip, icur, &r[1], state);
xfs_iext_insert(ip, icur, &r[0], state);
XFS_IFORK_NEXT_SET(ip, whichfork,
XFS_IFORK_NEXTENTS(ip, whichfork) + 2);
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, &old, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
/* new right extent - oldext */
error = xfs_bmbt_update(cur, &r[1]);
if (error)
goto done;
/* new left extent - oldext */
cur->bc_rec.b = PREV;
if ((error = xfs_btree_insert(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
/*
* Reset the cursor to the position of the new extent
* we are about to insert as we can't trust it after
* the previous insert.
*/
error = xfs_bmbt_lookup_eq(cur, new, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
/* new middle extent - newext */
if ((error = xfs_btree_insert(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
}
break;
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_LEFT_CONTIG:
case BMAP_RIGHT_CONTIG:
/*
* These cases are all impossible.
*/
ASSERT(0);
}
/* update reverse mappings */
error = xfs_rmap_convert_extent(mp, dfops, ip, whichfork, new);
if (error)
goto done;
/* convert to a btree if necessary */
if (xfs_bmap_needs_btree(ip, whichfork)) {
int tmp_logflags; /* partial log flag return val */
ASSERT(cur == NULL);
error = xfs_bmap_extents_to_btree(tp, ip, first, dfops, &cur,
0, &tmp_logflags, whichfork);
*logflagsp |= tmp_logflags;
if (error)
goto done;
}
/* clear out the allocated field, done with it now in any case. */
if (cur) {
cur->bc_private.b.allocated = 0;
*curp = cur;
}
xfs_bmap_check_leaf_extents(*curp, ip, whichfork);
done:
*logflagsp |= rval;
return error;
#undef LEFT
#undef RIGHT
#undef PREV
}
/*
* Convert a hole to a delayed allocation.
*/
STATIC void
xfs_bmap_add_extent_hole_delay(
xfs_inode_t *ip, /* incore inode pointer */
int whichfork,
struct xfs_iext_cursor *icur,
xfs_bmbt_irec_t *new) /* new data to add to file extents */
{
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_bmbt_irec_t left; /* left neighbor extent entry */
xfs_filblks_t newlen=0; /* new indirect size */
xfs_filblks_t oldlen=0; /* old indirect size */
xfs_bmbt_irec_t right; /* right neighbor extent entry */
int state = xfs_bmap_fork_to_state(whichfork);
xfs_filblks_t temp; /* temp for indirect calculations */
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(isnullstartblock(new->br_startblock));
/*
* Check and set flags if this segment has a left neighbor
*/
if (xfs_iext_peek_prev_extent(ifp, icur, &left)) {
state |= BMAP_LEFT_VALID;
if (isnullstartblock(left.br_startblock))
state |= BMAP_LEFT_DELAY;
}
/*
* Check and set flags if the current (right) segment exists.
* If it doesn't exist, we're converting the hole at end-of-file.
*/
if (xfs_iext_get_extent(ifp, icur, &right)) {
state |= BMAP_RIGHT_VALID;
if (isnullstartblock(right.br_startblock))
state |= BMAP_RIGHT_DELAY;
}
/*
* Set contiguity flags on the left and right neighbors.
* Don't let extents get too large, even if the pieces are contiguous.
*/
if ((state & BMAP_LEFT_VALID) && (state & BMAP_LEFT_DELAY) &&
left.br_startoff + left.br_blockcount == new->br_startoff &&
left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
state |= BMAP_LEFT_CONTIG;
if ((state & BMAP_RIGHT_VALID) && (state & BMAP_RIGHT_DELAY) &&
new->br_startoff + new->br_blockcount == right.br_startoff &&
new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
(!(state & BMAP_LEFT_CONTIG) ||
(left.br_blockcount + new->br_blockcount +
right.br_blockcount <= MAXEXTLEN)))
state |= BMAP_RIGHT_CONTIG;
/*
* Switch out based on the contiguity flags.
*/
switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
/*
* New allocation is contiguous with delayed allocations
* on the left and on the right.
* Merge all three into a single extent record.
*/
temp = left.br_blockcount + new->br_blockcount +
right.br_blockcount;
oldlen = startblockval(left.br_startblock) +
startblockval(new->br_startblock) +
startblockval(right.br_startblock);
newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
oldlen);
left.br_startblock = nullstartblock(newlen);
left.br_blockcount = temp;
xfs_iext_remove(ip, icur, state);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &left);
break;
case BMAP_LEFT_CONTIG:
/*
* New allocation is contiguous with a delayed allocation
* on the left.
* Merge the new allocation with the left neighbor.
*/
temp = left.br_blockcount + new->br_blockcount;
oldlen = startblockval(left.br_startblock) +
startblockval(new->br_startblock);
newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
oldlen);
left.br_blockcount = temp;
left.br_startblock = nullstartblock(newlen);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &left);
break;
case BMAP_RIGHT_CONTIG:
/*
* New allocation is contiguous with a delayed allocation
* on the right.
* Merge the new allocation with the right neighbor.
*/
temp = new->br_blockcount + right.br_blockcount;
oldlen = startblockval(new->br_startblock) +
startblockval(right.br_startblock);
newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
oldlen);
right.br_startoff = new->br_startoff;
right.br_startblock = nullstartblock(newlen);
right.br_blockcount = temp;
xfs_iext_update_extent(ip, state, icur, &right);
break;
case 0:
/*
* New allocation is not contiguous with another
* delayed allocation.
* Insert a new entry.
*/
oldlen = newlen = 0;
xfs_iext_insert(ip, icur, new, state);
break;
}
if (oldlen != newlen) {
ASSERT(oldlen > newlen);
xfs_mod_fdblocks(ip->i_mount, (int64_t)(oldlen - newlen),
false);
/*
* Nothing to do for disk quota accounting here.
*/
}
}
/*
* Convert a hole to a real allocation.
*/
STATIC int /* error */
xfs_bmap_add_extent_hole_real(
struct xfs_trans *tp,
struct xfs_inode *ip,
int whichfork,
struct xfs_iext_cursor *icur,
struct xfs_btree_cur **curp,
struct xfs_bmbt_irec *new,
xfs_fsblock_t *first,
struct xfs_defer_ops *dfops,
int *logflagsp)
{
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_mount *mp = ip->i_mount;
struct xfs_btree_cur *cur = *curp;
int error; /* error return value */
int i; /* temp state */
xfs_bmbt_irec_t left; /* left neighbor extent entry */
xfs_bmbt_irec_t right; /* right neighbor extent entry */
int rval=0; /* return value (logging flags) */
int state = xfs_bmap_fork_to_state(whichfork);
struct xfs_bmbt_irec old;
ASSERT(!isnullstartblock(new->br_startblock));
ASSERT(!cur || !(cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL));
XFS_STATS_INC(mp, xs_add_exlist);
/*
* Check and set flags if this segment has a left neighbor.
*/
if (xfs_iext_peek_prev_extent(ifp, icur, &left)) {
state |= BMAP_LEFT_VALID;
if (isnullstartblock(left.br_startblock))
state |= BMAP_LEFT_DELAY;
}
/*
* Check and set flags if this segment has a current value.
* Not true if we're inserting into the "hole" at eof.
*/
if (xfs_iext_get_extent(ifp, icur, &right)) {
state |= BMAP_RIGHT_VALID;
if (isnullstartblock(right.br_startblock))
state |= BMAP_RIGHT_DELAY;
}
/*
* We're inserting a real allocation between "left" and "right".
* Set the contiguity flags. Don't let extents get too large.
*/
if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
left.br_startoff + left.br_blockcount == new->br_startoff &&
left.br_startblock + left.br_blockcount == new->br_startblock &&
left.br_state == new->br_state &&
left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
state |= BMAP_LEFT_CONTIG;
if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
new->br_startoff + new->br_blockcount == right.br_startoff &&
new->br_startblock + new->br_blockcount == right.br_startblock &&
new->br_state == right.br_state &&
new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
(!(state & BMAP_LEFT_CONTIG) ||
left.br_blockcount + new->br_blockcount +
right.br_blockcount <= MAXEXTLEN))
state |= BMAP_RIGHT_CONTIG;
error = 0;
/*
* Select which case we're in here, and implement it.
*/
switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
/*
* New allocation is contiguous with real allocations on the
* left and on the right.
* Merge all three into a single extent record.
*/
left.br_blockcount += new->br_blockcount + right.br_blockcount;
xfs_iext_remove(ip, icur, state);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &left);
XFS_IFORK_NEXT_SET(ip, whichfork,
XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
if (cur == NULL) {
rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
} else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, &right, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_btree_delete(cur, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_btree_decrement(cur, 0, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_bmbt_update(cur, &left);
if (error)
goto done;
}
break;
case BMAP_LEFT_CONTIG:
/*
* New allocation is contiguous with a real allocation
* on the left.
* Merge the new allocation with the left neighbor.
*/
old = left;
left.br_blockcount += new->br_blockcount;
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &left);
if (cur == NULL) {
rval = xfs_ilog_fext(whichfork);
} else {
rval = 0;
error = xfs_bmbt_lookup_eq(cur, &old, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_bmbt_update(cur, &left);
if (error)
goto done;
}
break;
case BMAP_RIGHT_CONTIG:
/*
* New allocation is contiguous with a real allocation
* on the right.
* Merge the new allocation with the right neighbor.
*/
old = right;
right.br_startoff = new->br_startoff;
right.br_startblock = new->br_startblock;
right.br_blockcount += new->br_blockcount;
xfs_iext_update_extent(ip, state, icur, &right);
if (cur == NULL) {
rval = xfs_ilog_fext(whichfork);
} else {
rval = 0;
error = xfs_bmbt_lookup_eq(cur, &old, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_bmbt_update(cur, &right);
if (error)
goto done;
}
break;
case 0:
/*
* New allocation is not contiguous with another
* real allocation.
* Insert a new entry.
*/
xfs_iext_insert(ip, icur, new, state);
XFS_IFORK_NEXT_SET(ip, whichfork,
XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
if (cur == NULL) {
rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
} else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, new, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
error = xfs_btree_insert(cur, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
}
break;
}
/* add reverse mapping */
error = xfs_rmap_map_extent(mp, dfops, ip, whichfork, new);
if (error)
goto done;
/* convert to a btree if necessary */
if (xfs_bmap_needs_btree(ip, whichfork)) {
int tmp_logflags; /* partial log flag return val */
ASSERT(cur == NULL);
error = xfs_bmap_extents_to_btree(tp, ip, first, dfops, curp,
0, &tmp_logflags, whichfork);
*logflagsp |= tmp_logflags;
cur = *curp;
if (error)
goto done;
}
/* clear out the allocated field, done with it now in any case. */
if (cur)
cur->bc_private.b.allocated = 0;
xfs_bmap_check_leaf_extents(cur, ip, whichfork);
done:
*logflagsp |= rval;
return error;
}
/*
* Functions used in the extent read, allocate and remove paths
*/
/*
* Adjust the size of the new extent based on di_extsize and rt extsize.
*/
int
xfs_bmap_extsize_align(
xfs_mount_t *mp,
xfs_bmbt_irec_t *gotp, /* next extent pointer */
xfs_bmbt_irec_t *prevp, /* previous extent pointer */
xfs_extlen_t extsz, /* align to this extent size */
int rt, /* is this a realtime inode? */
int eof, /* is extent at end-of-file? */
int delay, /* creating delalloc extent? */
int convert, /* overwriting unwritten extent? */
xfs_fileoff_t *offp, /* in/out: aligned offset */
xfs_extlen_t *lenp) /* in/out: aligned length */
{
xfs_fileoff_t orig_off; /* original offset */
xfs_extlen_t orig_alen; /* original length */
xfs_fileoff_t orig_end; /* original off+len */
xfs_fileoff_t nexto; /* next file offset */
xfs_fileoff_t prevo; /* previous file offset */
xfs_fileoff_t align_off; /* temp for offset */
xfs_extlen_t align_alen; /* temp for length */
xfs_extlen_t temp; /* temp for calculations */
if (convert)
return 0;
orig_off = align_off = *offp;
orig_alen = align_alen = *lenp;
orig_end = orig_off + orig_alen;
/*
* If this request overlaps an existing extent, then don't
* attempt to perform any additional alignment.
*/
if (!delay && !eof &&
(orig_off >= gotp->br_startoff) &&
(orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
return 0;
}
/*
* If the file offset is unaligned vs. the extent size
* we need to align it. This will be possible unless
* the file was previously written with a kernel that didn't
* perform this alignment, or if a truncate shot us in the
* foot.
*/
temp = do_mod(orig_off, extsz);
if (temp) {
align_alen += temp;
align_off -= temp;
}
/* Same adjustment for the end of the requested area. */
temp = (align_alen % extsz);
if (temp)
align_alen += extsz - temp;
/*
* For large extent hint sizes, the aligned extent might be larger than
* MAXEXTLEN. In that case, reduce the size by an extsz so that it pulls
* the length back under MAXEXTLEN. The outer allocation loops handle
* short allocation just fine, so it is safe to do this. We only want to
* do it when we are forced to, though, because it means more allocation
* operations are required.
*/
while (align_alen > MAXEXTLEN)
align_alen -= extsz;
ASSERT(align_alen <= MAXEXTLEN);
/*
* If the previous block overlaps with this proposed allocation
* then move the start forward without adjusting the length.
*/
if (prevp->br_startoff != NULLFILEOFF) {
if (prevp->br_startblock == HOLESTARTBLOCK)
prevo = prevp->br_startoff;
else
prevo = prevp->br_startoff + prevp->br_blockcount;
} else
prevo = 0;
if (align_off != orig_off && align_off < prevo)
align_off = prevo;
/*
* If the next block overlaps with this proposed allocation
* then move the start back without adjusting the length,
* but not before offset 0.
* This may of course make the start overlap previous block,
* and if we hit the offset 0 limit then the next block
* can still overlap too.
*/
if (!eof && gotp->br_startoff != NULLFILEOFF) {
if ((delay && gotp->br_startblock == HOLESTARTBLOCK) ||
(!delay && gotp->br_startblock == DELAYSTARTBLOCK))
nexto = gotp->br_startoff + gotp->br_blockcount;
else
nexto = gotp->br_startoff;
} else
nexto = NULLFILEOFF;
if (!eof &&
align_off + align_alen != orig_end &&
align_off + align_alen > nexto)
align_off = nexto > align_alen ? nexto - align_alen : 0;
/*
* If we're now overlapping the next or previous extent that
* means we can't fit an extsz piece in this hole. Just move
* the start forward to the first valid spot and set
* the length so we hit the end.
*/
if (align_off != orig_off && align_off < prevo)
align_off = prevo;
if (align_off + align_alen != orig_end &&
align_off + align_alen > nexto &&
nexto != NULLFILEOFF) {
ASSERT(nexto > prevo);
align_alen = nexto - align_off;
}
/*
* If realtime, and the result isn't a multiple of the realtime
* extent size we need to remove blocks until it is.
*/
if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) {
/*
* We're not covering the original request, or
* we won't be able to once we fix the length.
*/
if (orig_off < align_off ||
orig_end > align_off + align_alen ||
align_alen - temp < orig_alen)
return -EINVAL;
/*
* Try to fix it by moving the start up.
*/
if (align_off + temp <= orig_off) {
align_alen -= temp;
align_off += temp;
}
/*
* Try to fix it by moving the end in.
*/
else if (align_off + align_alen - temp >= orig_end)
align_alen -= temp;
/*
* Set the start to the minimum then trim the length.
*/
else {
align_alen -= orig_off - align_off;
align_off = orig_off;
align_alen -= align_alen % mp->m_sb.sb_rextsize;
}
/*
* Result doesn't cover the request, fail it.
*/
if (orig_off < align_off || orig_end > align_off + align_alen)
return -EINVAL;
} else {
ASSERT(orig_off >= align_off);
/* see MAXEXTLEN handling above */
ASSERT(orig_end <= align_off + align_alen ||
align_alen + extsz > MAXEXTLEN);
}
#ifdef DEBUG
if (!eof && gotp->br_startoff != NULLFILEOFF)
ASSERT(align_off + align_alen <= gotp->br_startoff);
if (prevp->br_startoff != NULLFILEOFF)
ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount);
#endif
*lenp = align_alen;
*offp = align_off;
return 0;
}
#define XFS_ALLOC_GAP_UNITS 4
void
xfs_bmap_adjacent(
struct xfs_bmalloca *ap) /* bmap alloc argument struct */
{
xfs_fsblock_t adjust; /* adjustment to block numbers */
xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
xfs_mount_t *mp; /* mount point structure */
int nullfb; /* true if ap->firstblock isn't set */
int rt; /* true if inode is realtime */
#define ISVALID(x,y) \
(rt ? \
(x) < mp->m_sb.sb_rblocks : \
XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
mp = ap->ip->i_mount;
nullfb = *ap->firstblock == NULLFSBLOCK;
rt = XFS_IS_REALTIME_INODE(ap->ip) &&
xfs_alloc_is_userdata(ap->datatype);
fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, *ap->firstblock);
/*
* If allocating at eof, and there's a previous real block,
* try to use its last block as our starting point.
*/
if (ap->eof && ap->prev.br_startoff != NULLFILEOFF &&
!isnullstartblock(ap->prev.br_startblock) &&
ISVALID(ap->prev.br_startblock + ap->prev.br_blockcount,
ap->prev.br_startblock)) {
ap->blkno = ap->prev.br_startblock + ap->prev.br_blockcount;
/*
* Adjust for the gap between prevp and us.
*/
adjust = ap->offset -
(ap->prev.br_startoff + ap->prev.br_blockcount);
if (adjust &&
ISVALID(ap->blkno + adjust, ap->prev.br_startblock))
ap->blkno += adjust;
}
/*
* If not at eof, then compare the two neighbor blocks.
* Figure out whether either one gives us a good starting point,
* and pick the better one.
*/
else if (!ap->eof) {
xfs_fsblock_t gotbno; /* right side block number */
xfs_fsblock_t gotdiff=0; /* right side difference */
xfs_fsblock_t prevbno; /* left side block number */
xfs_fsblock_t prevdiff=0; /* left side difference */
/*
* If there's a previous (left) block, select a requested
* start block based on it.
*/
if (ap->prev.br_startoff != NULLFILEOFF &&
!isnullstartblock(ap->prev.br_startblock) &&
(prevbno = ap->prev.br_startblock +
ap->prev.br_blockcount) &&
ISVALID(prevbno, ap->prev.br_startblock)) {
/*
* Calculate gap to end of previous block.
*/
adjust = prevdiff = ap->offset -
(ap->prev.br_startoff +
ap->prev.br_blockcount);
/*
* Figure the startblock based on the previous block's
* end and the gap size.
* Heuristic!
* If the gap is large relative to the piece we're
* allocating, or using it gives us an invalid block
* number, then just use the end of the previous block.
*/
if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->length &&
ISVALID(prevbno + prevdiff,
ap->prev.br_startblock))
prevbno += adjust;
else
prevdiff += adjust;
/*
* If the firstblock forbids it, can't use it,
* must use default.
*/
if (!rt && !nullfb &&
XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno)
prevbno = NULLFSBLOCK;
}
/*
* No previous block or can't follow it, just default.
*/
else
prevbno = NULLFSBLOCK;
/*
* If there's a following (right) block, select a requested
* start block based on it.
*/
if (!isnullstartblock(ap->got.br_startblock)) {
/*
* Calculate gap to start of next block.
*/
adjust = gotdiff = ap->got.br_startoff - ap->offset;
/*
* Figure the startblock based on the next block's
* start and the gap size.
*/
gotbno = ap->got.br_startblock;
/*
* Heuristic!
* If the gap is large relative to the piece we're
* allocating, or using it gives us an invalid block
* number, then just use the start of the next block
* offset by our length.
*/
if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->length &&
ISVALID(gotbno - gotdiff, gotbno))
gotbno -= adjust;
else if (ISVALID(gotbno - ap->length, gotbno)) {
gotbno -= ap->length;
gotdiff += adjust - ap->length;
} else
gotdiff += adjust;
/*
* If the firstblock forbids it, can't use it,
* must use default.
*/
if (!rt && !nullfb &&
XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno)
gotbno = NULLFSBLOCK;
}
/*
* No next block, just default.
*/
else
gotbno = NULLFSBLOCK;
/*
* If both valid, pick the better one, else the only good
* one, else ap->blkno is already set (to 0 or the inode block).
*/
if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
ap->blkno = prevdiff <= gotdiff ? prevbno : gotbno;
else if (prevbno != NULLFSBLOCK)
ap->blkno = prevbno;
else if (gotbno != NULLFSBLOCK)
ap->blkno = gotbno;
}
#undef ISVALID
}
static int
xfs_bmap_longest_free_extent(
struct xfs_trans *tp,
xfs_agnumber_t ag,
xfs_extlen_t *blen,
int *notinit)
{
struct xfs_mount *mp = tp->t_mountp;
struct xfs_perag *pag;
xfs_extlen_t longest;
int error = 0;
pag = xfs_perag_get(mp, ag);
if (!pag->pagf_init) {
error = xfs_alloc_pagf_init(mp, tp, ag, XFS_ALLOC_FLAG_TRYLOCK);
if (error)
goto out;
if (!pag->pagf_init) {
*notinit = 1;
goto out;
}
}
longest = xfs_alloc_longest_free_extent(mp, pag,
xfs_alloc_min_freelist(mp, pag),
xfs_ag_resv_needed(pag, XFS_AG_RESV_NONE));
if (*blen < longest)
*blen = longest;
out:
xfs_perag_put(pag);
return error;
}
static void
xfs_bmap_select_minlen(
struct xfs_bmalloca *ap,
struct xfs_alloc_arg *args,
xfs_extlen_t *blen,
int notinit)
{
if (notinit || *blen < ap->minlen) {
/*
* Since we did a BUF_TRYLOCK above, it is possible that
* there is space for this request.
*/
args->minlen = ap->minlen;
} else if (*blen < args->maxlen) {
/*
* If the best seen length is less than the request length,
* use the best as the minimum.
*/
args->minlen = *blen;
} else {
/*
* Otherwise we've seen an extent as big as maxlen, use that
* as the minimum.
*/
args->minlen = args->maxlen;
}
}
STATIC int
xfs_bmap_btalloc_nullfb(
struct xfs_bmalloca *ap,
struct xfs_alloc_arg *args,
xfs_extlen_t *blen)
{
struct xfs_mount *mp = ap->ip->i_mount;
xfs_agnumber_t ag, startag;
int notinit = 0;
int error;
args->type = XFS_ALLOCTYPE_START_BNO;
args->total = ap->total;
startag = ag = XFS_FSB_TO_AGNO(mp, args->fsbno);
if (startag == NULLAGNUMBER)
startag = ag = 0;
while (*blen < args->maxlen) {
error = xfs_bmap_longest_free_extent(args->tp, ag, blen,
&notinit);
if (error)
return error;
if (++ag == mp->m_sb.sb_agcount)
ag = 0;
if (ag == startag)
break;
}
xfs_bmap_select_minlen(ap, args, blen, notinit);
return 0;
}
STATIC int
xfs_bmap_btalloc_filestreams(
struct xfs_bmalloca *ap,
struct xfs_alloc_arg *args,
xfs_extlen_t *blen)
{
struct xfs_mount *mp = ap->ip->i_mount;
xfs_agnumber_t ag;
int notinit = 0;
int error;
args->type = XFS_ALLOCTYPE_NEAR_BNO;
args->total = ap->total;
ag = XFS_FSB_TO_AGNO(mp, args->fsbno);
if (ag == NULLAGNUMBER)
ag = 0;
error = xfs_bmap_longest_free_extent(args->tp, ag, blen, &notinit);
if (error)
return error;
if (*blen < args->maxlen) {
error = xfs_filestream_new_ag(ap, &ag);
if (error)
return error;
error = xfs_bmap_longest_free_extent(args->tp, ag, blen,
&notinit);
if (error)
return error;
}
xfs_bmap_select_minlen(ap, args, blen, notinit);
/*
* Set the failure fallback case to look in the selected AG as stream
* may have moved.
*/
ap->blkno = args->fsbno = XFS_AGB_TO_FSB(mp, ag, 0);
return 0;
}
/* Update all inode and quota accounting for the allocation we just did. */
static void
xfs_bmap_btalloc_accounting(
struct xfs_bmalloca *ap,
struct xfs_alloc_arg *args)
{
if (ap->flags & XFS_BMAPI_COWFORK) {
/*
* COW fork blocks are in-core only and thus are treated as
* in-core quota reservation (like delalloc blocks) even when
* converted to real blocks. The quota reservation is not
* accounted to disk until blocks are remapped to the data
* fork. So if these blocks were previously delalloc, we
* already have quota reservation and there's nothing to do
* yet.
*/
if (ap->wasdel)
return;
/*
* Otherwise, we've allocated blocks in a hole. The transaction
* has acquired in-core quota reservation for this extent.
* Rather than account these as real blocks, however, we reduce
* the transaction quota reservation based on the allocation.
* This essentially transfers the transaction quota reservation
* to that of a delalloc extent.
*/
ap->ip->i_delayed_blks += args->len;
xfs_trans_mod_dquot_byino(ap->tp, ap->ip, XFS_TRANS_DQ_RES_BLKS,
-(long)args->len);
return;
}
/* data/attr fork only */
ap->ip->i_d.di_nblocks += args->len;
xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
if (ap->wasdel)
ap->ip->i_delayed_blks -= args->len;
xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT : XFS_TRANS_DQ_BCOUNT,
args->len);
}
STATIC int
xfs_bmap_btalloc(
struct xfs_bmalloca *ap) /* bmap alloc argument struct */
{
xfs_mount_t *mp; /* mount point structure */
xfs_alloctype_t atype = 0; /* type for allocation routines */
xfs_extlen_t align = 0; /* minimum allocation alignment */
xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
xfs_agnumber_t ag;
xfs_alloc_arg_t args;
xfs_fileoff_t orig_offset;
xfs_extlen_t orig_length;
xfs_extlen_t blen;
xfs_extlen_t nextminlen = 0;
int nullfb; /* true if ap->firstblock isn't set */
int isaligned;
int tryagain;
int error;
int stripe_align;
ASSERT(ap->length);
orig_offset = ap->offset;
orig_length = ap->length;
mp = ap->ip->i_mount;
/* stripe alignment for allocation is determined by mount parameters */
stripe_align = 0;
if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC))
stripe_align = mp->m_swidth;
else if (mp->m_dalign)
stripe_align = mp->m_dalign;
if (ap->flags & XFS_BMAPI_COWFORK)
align = xfs_get_cowextsz_hint(ap->ip);
else if (xfs_alloc_is_userdata(ap->datatype))
align = xfs_get_extsz_hint(ap->ip);
if (align) {
error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev,
align, 0, ap->eof, 0, ap->conv,
&ap->offset, &ap->length);
ASSERT(!error);
ASSERT(ap->length);
}
nullfb = *ap->firstblock == NULLFSBLOCK;
fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, *ap->firstblock);
if (nullfb) {
if (xfs_alloc_is_userdata(ap->datatype) &&
xfs_inode_is_filestream(ap->ip)) {
ag = xfs_filestream_lookup_ag(ap->ip);
ag = (ag != NULLAGNUMBER) ? ag : 0;
ap->blkno = XFS_AGB_TO_FSB(mp, ag, 0);
} else {
ap->blkno = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
}
} else
ap->blkno = *ap->firstblock;
xfs_bmap_adjacent(ap);
/*
* If allowed, use ap->blkno; otherwise must use firstblock since
* it's in the right allocation group.
*/
if (nullfb || XFS_FSB_TO_AGNO(mp, ap->blkno) == fb_agno)
;
else
ap->blkno = *ap->firstblock;
/*
* Normal allocation, done through xfs_alloc_vextent.
*/
tryagain = isaligned = 0;
memset(&args, 0, sizeof(args));
args.tp = ap->tp;
args.mp = mp;
args.fsbno = ap->blkno;
xfs_rmap_skip_owner_update(&args.oinfo);
/* Trim the allocation back to the maximum an AG can fit. */
args.maxlen = MIN(ap->length, mp->m_ag_max_usable);
args.firstblock = *ap->firstblock;
blen = 0;
if (nullfb) {
/*
* Search for an allocation group with a single extent large
* enough for the request. If one isn't found, then adjust
* the minimum allocation size to the largest space found.
*/
if (xfs_alloc_is_userdata(ap->datatype) &&
xfs_inode_is_filestream(ap->ip))
error = xfs_bmap_btalloc_filestreams(ap, &args, &blen);
else
error = xfs_bmap_btalloc_nullfb(ap, &args, &blen);
if (error)
return error;
} else if (ap->dfops->dop_low) {
if (xfs_inode_is_filestream(ap->ip))
args.type = XFS_ALLOCTYPE_FIRST_AG;
else
args.type = XFS_ALLOCTYPE_START_BNO;
args.total = args.minlen = ap->minlen;
} else {
args.type = XFS_ALLOCTYPE_NEAR_BNO;
args.total = ap->total;
args.minlen = ap->minlen;
}
/* apply extent size hints if obtained earlier */
if (align) {
args.prod = align;
if ((args.mod = (xfs_extlen_t)do_mod(ap->offset, args.prod)))
args.mod = (xfs_extlen_t)(args.prod - args.mod);
} else if (mp->m_sb.sb_blocksize >= PAGE_SIZE) {
args.prod = 1;
args.mod = 0;
} else {
args.prod = PAGE_SIZE >> mp->m_sb.sb_blocklog;
if ((args.mod = (xfs_extlen_t)(do_mod(ap->offset, args.prod))))
args.mod = (xfs_extlen_t)(args.prod - args.mod);
}
/*
* If we are not low on available data blocks, and the
* underlying logical volume manager is a stripe, and
* the file offset is zero then try to allocate data
* blocks on stripe unit boundary.
* NOTE: ap->aeof is only set if the allocation length
* is >= the stripe unit and the allocation offset is
* at the end of file.
*/
if (!ap->dfops->dop_low && ap->aeof) {
if (!ap->offset) {
args.alignment = stripe_align;
atype = args.type;
isaligned = 1;
/*
* Adjust for alignment
*/
if (blen > args.alignment && blen <= args.maxlen)
args.minlen = blen - args.alignment;
args.minalignslop = 0;
} else {
/*
* First try an exact bno allocation.
* If it fails then do a near or start bno
* allocation with alignment turned on.
*/
atype = args.type;
tryagain = 1;
args.type = XFS_ALLOCTYPE_THIS_BNO;
args.alignment = 1;
/*
* Compute the minlen+alignment for the
* next case. Set slop so that the value
* of minlen+alignment+slop doesn't go up
* between the calls.
*/
if (blen > stripe_align && blen <= args.maxlen)
nextminlen = blen - stripe_align;
else
nextminlen = args.minlen;
if (nextminlen + stripe_align > args.minlen + 1)
args.minalignslop =
nextminlen + stripe_align -
args.minlen - 1;
else
args.minalignslop = 0;
}
} else {
args.alignment = 1;
args.minalignslop = 0;
}
args.minleft = ap->minleft;
args.wasdel = ap->wasdel;
args.resv = XFS_AG_RESV_NONE;
args.datatype = ap->datatype;
if (ap->datatype & XFS_ALLOC_USERDATA_ZERO)
args.ip = ap->ip;
error = xfs_alloc_vextent(&args);
if (error)
return error;
if (tryagain && args.fsbno == NULLFSBLOCK) {
/*
* Exact allocation failed. Now try with alignment
* turned on.
*/
args.type = atype;
args.fsbno = ap->blkno;
args.alignment = stripe_align;
args.minlen = nextminlen;
args.minalignslop = 0;
isaligned = 1;
if ((error = xfs_alloc_vextent(&args)))
return error;
}
if (isaligned && args.fsbno == NULLFSBLOCK) {
/*
* allocation failed, so turn off alignment and
* try again.
*/
args.type = atype;
args.fsbno = ap->blkno;
args.alignment = 0;
if ((error = xfs_alloc_vextent(&args)))
return error;
}
if (args.fsbno == NULLFSBLOCK && nullfb &&
args.minlen > ap->minlen) {
args.minlen = ap->minlen;
args.type = XFS_ALLOCTYPE_START_BNO;
args.fsbno = ap->blkno;
if ((error = xfs_alloc_vextent(&args)))
return error;
}
if (args.fsbno == NULLFSBLOCK && nullfb) {
args.fsbno = 0;
args.type = XFS_ALLOCTYPE_FIRST_AG;
args.total = ap->minlen;
if ((error = xfs_alloc_vextent(&args)))
return error;
ap->dfops->dop_low = true;
}
if (args.fsbno != NULLFSBLOCK) {
/*
* check the allocation happened at the same or higher AG than
* the first block that was allocated.
*/
ASSERT(*ap->firstblock == NULLFSBLOCK ||
XFS_FSB_TO_AGNO(mp, *ap->firstblock) <=
XFS_FSB_TO_AGNO(mp, args.fsbno));
ap->blkno = args.fsbno;
if (*ap->firstblock == NULLFSBLOCK)
*ap->firstblock = args.fsbno;
ASSERT(nullfb || fb_agno <= args.agno);
ap->length = args.len;
/*
* If the extent size hint is active, we tried to round the
* caller's allocation request offset down to extsz and the
* length up to another extsz boundary. If we found a free
* extent we mapped it in starting at this new offset. If the
* newly mapped space isn't long enough to cover any of the
* range of offsets that was originally requested, move the
* mapping up so that we can fill as much of the caller's
* original request as possible. Free space is apparently
* very fragmented so we're unlikely to be able to satisfy the
* hints anyway.
*/
if (ap->length <= orig_length)
ap->offset = orig_offset;
else if (ap->offset + ap->length < orig_offset + orig_length)
ap->offset = orig_offset + orig_length - ap->length;
xfs_bmap_btalloc_accounting(ap, &args);
} else {
ap->blkno = NULLFSBLOCK;
ap->length = 0;
}
return 0;
}
/*
* xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
* It figures out where to ask the underlying allocator to put the new extent.
*/
STATIC int
xfs_bmap_alloc(
struct xfs_bmalloca *ap) /* bmap alloc argument struct */
{
if (XFS_IS_REALTIME_INODE(ap->ip) &&
xfs_alloc_is_userdata(ap->datatype))
return xfs_bmap_rtalloc(ap);
return xfs_bmap_btalloc(ap);
}
/* Trim extent to fit a logical block range. */
void
xfs_trim_extent(
struct xfs_bmbt_irec *irec,
xfs_fileoff_t bno,
xfs_filblks_t len)
{
xfs_fileoff_t distance;
xfs_fileoff_t end = bno + len;
if (irec->br_startoff + irec->br_blockcount <= bno ||
irec->br_startoff >= end) {
irec->br_blockcount = 0;
return;
}
if (irec->br_startoff < bno) {
distance = bno - irec->br_startoff;
if (isnullstartblock(irec->br_startblock))
irec->br_startblock = DELAYSTARTBLOCK;
if (irec->br_startblock != DELAYSTARTBLOCK &&
irec->br_startblock != HOLESTARTBLOCK)
irec->br_startblock += distance;
irec->br_startoff += distance;
irec->br_blockcount -= distance;
}
if (end < irec->br_startoff + irec->br_blockcount) {
distance = irec->br_startoff + irec->br_blockcount - end;
irec->br_blockcount -= distance;
}
}
/* trim extent to within eof */
void
xfs_trim_extent_eof(
struct xfs_bmbt_irec *irec,
struct xfs_inode *ip)
{
xfs_trim_extent(irec, 0, XFS_B_TO_FSB(ip->i_mount,
i_size_read(VFS_I(ip))));
}
/*
* Trim the returned map to the required bounds
*/
STATIC void
xfs_bmapi_trim_map(
struct xfs_bmbt_irec *mval,
struct xfs_bmbt_irec *got,
xfs_fileoff_t *bno,
xfs_filblks_t len,
xfs_fileoff_t obno,
xfs_fileoff_t end,
int n,
int flags)
{
if ((flags & XFS_BMAPI_ENTIRE) ||
got->br_startoff + got->br_blockcount <= obno) {
*mval = *got;
if (isnullstartblock(got->br_startblock))
mval->br_startblock = DELAYSTARTBLOCK;
return;
}
if (obno > *bno)
*bno = obno;
ASSERT((*bno >= obno) || (n == 0));
ASSERT(*bno < end);
mval->br_startoff = *bno;
if (isnullstartblock(got->br_startblock))
mval->br_startblock = DELAYSTARTBLOCK;
else
mval->br_startblock = got->br_startblock +
(*bno - got->br_startoff);
/*
* Return the minimum of what we got and what we asked for for
* the length. We can use the len variable here because it is
* modified below and we could have been there before coming
* here if the first part of the allocation didn't overlap what
* was asked for.
*/
mval->br_blockcount = XFS_FILBLKS_MIN(end - *bno,
got->br_blockcount - (*bno - got->br_startoff));
mval->br_state = got->br_state;
ASSERT(mval->br_blockcount <= len);
return;
}
/*
* Update and validate the extent map to return
*/
STATIC void
xfs_bmapi_update_map(
struct xfs_bmbt_irec **map,
xfs_fileoff_t *bno,
xfs_filblks_t *len,
xfs_fileoff_t obno,
xfs_fileoff_t end,
int *n,
int flags)
{
xfs_bmbt_irec_t *mval = *map;
ASSERT((flags & XFS_BMAPI_ENTIRE) ||
((mval->br_startoff + mval->br_blockcount) <= end));
ASSERT((flags & XFS_BMAPI_ENTIRE) || (mval->br_blockcount <= *len) ||
(mval->br_startoff < obno));
*bno = mval->br_startoff + mval->br_blockcount;
*len = end - *bno;
if (*n > 0 && mval->br_startoff == mval[-1].br_startoff) {
/* update previous map with new information */
ASSERT(mval->br_startblock == mval[-1].br_startblock);
ASSERT(mval->br_blockcount > mval[-1].br_blockcount);
ASSERT(mval->br_state == mval[-1].br_state);
mval[-1].br_blockcount = mval->br_blockcount;
mval[-1].br_state = mval->br_state;
} else if (*n > 0 && mval->br_startblock != DELAYSTARTBLOCK &&
mval[-1].br_startblock != DELAYSTARTBLOCK &&
mval[-1].br_startblock != HOLESTARTBLOCK &&
mval->br_startblock == mval[-1].br_startblock +
mval[-1].br_blockcount &&
((flags & XFS_BMAPI_IGSTATE) ||
mval[-1].br_state == mval->br_state)) {
ASSERT(mval->br_startoff ==
mval[-1].br_startoff + mval[-1].br_blockcount);
mval[-1].br_blockcount += mval->br_blockcount;
} else if (*n > 0 &&
mval->br_startblock == DELAYSTARTBLOCK &&
mval[-1].br_startblock == DELAYSTARTBLOCK &&
mval->br_startoff ==
mval[-1].br_startoff + mval[-1].br_blockcount) {
mval[-1].br_blockcount += mval->br_blockcount;
mval[-1].br_state = mval->br_state;
} else if (!((*n == 0) &&
((mval->br_startoff + mval->br_blockcount) <=
obno))) {
mval++;
(*n)++;
}
*map = mval;
}
/*
* Map file blocks to filesystem blocks without allocation.
*/
int
xfs_bmapi_read(
struct xfs_inode *ip,
xfs_fileoff_t bno,
xfs_filblks_t len,
struct xfs_bmbt_irec *mval,
int *nmap,
int flags)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp;
struct xfs_bmbt_irec got;
xfs_fileoff_t obno;
xfs_fileoff_t end;
struct xfs_iext_cursor icur;
int error;
bool eof = false;
int n = 0;
int whichfork = xfs_bmapi_whichfork(flags);
ASSERT(*nmap >= 1);
ASSERT(!(flags & ~(XFS_BMAPI_ATTRFORK|XFS_BMAPI_ENTIRE|
XFS_BMAPI_IGSTATE|XFS_BMAPI_COWFORK)));
ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED|XFS_ILOCK_EXCL));
if (unlikely(XFS_TEST_ERROR(
(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
mp, XFS_ERRTAG_BMAPIFORMAT))) {
XFS_ERROR_REPORT("xfs_bmapi_read", XFS_ERRLEVEL_LOW, mp);
return -EFSCORRUPTED;
}
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
XFS_STATS_INC(mp, xs_blk_mapr);
ifp = XFS_IFORK_PTR(ip, whichfork);
/* No CoW fork? Return a hole. */
if (whichfork == XFS_COW_FORK && !ifp) {
mval->br_startoff = bno;
mval->br_startblock = HOLESTARTBLOCK;
mval->br_blockcount = len;
mval->br_state = XFS_EXT_NORM;
*nmap = 1;
return 0;
}
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
error = xfs_iread_extents(NULL, ip, whichfork);
if (error)
return error;
}
if (!xfs_iext_lookup_extent(ip, ifp, bno, &icur, &got))
eof = true;
end = bno + len;
obno = bno;
while (bno < end && n < *nmap) {
/* Reading past eof, act as though there's a hole up to end. */
if (eof)
got.br_startoff = end;
if (got.br_startoff > bno) {
/* Reading in a hole. */
mval->br_startoff = bno;
mval->br_startblock = HOLESTARTBLOCK;
mval->br_blockcount =
XFS_FILBLKS_MIN(len, got.br_startoff - bno);
mval->br_state = XFS_EXT_NORM;
bno += mval->br_blockcount;
len -= mval->br_blockcount;
mval++;
n++;
continue;
}
/* set up the extent map to return. */
xfs_bmapi_trim_map(mval, &got, &bno, len, obno, end, n, flags);
xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
/* If we're done, stop now. */
if (bno >= end || n >= *nmap)
break;
/* Else go on to the next record. */
if (!xfs_iext_next_extent(ifp, &icur, &got))
eof = true;
}
*nmap = n;
return 0;
}
/*
* Add a delayed allocation extent to an inode. Blocks are reserved from the
* global pool and the extent inserted into the inode in-core extent tree.
*
* On entry, got refers to the first extent beyond the offset of the extent to
* allocate or eof is specified if no such extent exists. On return, got refers
* to the extent record that was inserted to the inode fork.
*
* Note that the allocated extent may have been merged with contiguous extents
* during insertion into the inode fork. Thus, got does not reflect the current
* state of the inode fork on return. If necessary, the caller can use lastx to
* look up the updated record in the inode fork.
*/
int
xfs_bmapi_reserve_delalloc(
struct xfs_inode *ip,
int whichfork,
xfs_fileoff_t off,
xfs_filblks_t len,
xfs_filblks_t prealloc,
struct xfs_bmbt_irec *got,
struct xfs_iext_cursor *icur,
int eof)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
xfs_extlen_t alen;
xfs_extlen_t indlen;
int error;
xfs_fileoff_t aoff = off;
/*
* Cap the alloc length. Keep track of prealloc so we know whether to
* tag the inode before we return.
*/
alen = XFS_FILBLKS_MIN(len + prealloc, MAXEXTLEN);
if (!eof)
alen = XFS_FILBLKS_MIN(alen, got->br_startoff - aoff);
if (prealloc && alen >= len)
prealloc = alen - len;
/* Figure out the extent size, adjust alen */
if (whichfork == XFS_COW_FORK) {
struct xfs_bmbt_irec prev;
xfs_extlen_t extsz = xfs_get_cowextsz_hint(ip);
if (!xfs_iext_peek_prev_extent(ifp, icur, &prev))
prev.br_startoff = NULLFILEOFF;
error = xfs_bmap_extsize_align(mp, got, &prev, extsz, 0, eof,
1, 0, &aoff, &alen);
ASSERT(!error);
}
/*
* Make a transaction-less quota reservation for delayed allocation
* blocks. This number gets adjusted later. We return if we haven't
* allocated blocks already inside this loop.
*/
error = xfs_trans_reserve_quota_nblks(NULL, ip, (long)alen, 0,
XFS_QMOPT_RES_REGBLKS);
if (error)
return error;
/*
* Split changing sb for alen and indlen since they could be coming
* from different places.
*/
indlen = (xfs_extlen_t)xfs_bmap_worst_indlen(ip, alen);
ASSERT(indlen > 0);
error = xfs_mod_fdblocks(mp, -((int64_t)alen), false);
if (error)
goto out_unreserve_quota;
error = xfs_mod_fdblocks(mp, -((int64_t)indlen), false);
if (error)
goto out_unreserve_blocks;
ip->i_delayed_blks += alen;
got->br_startoff = aoff;
got->br_startblock = nullstartblock(indlen);
got->br_blockcount = alen;
got->br_state = XFS_EXT_NORM;
xfs_bmap_add_extent_hole_delay(ip, whichfork, icur, got);
/*
* Tag the inode if blocks were preallocated. Note that COW fork
* preallocation can occur at the start or end of the extent, even when
* prealloc == 0, so we must also check the aligned offset and length.
*/
if (whichfork == XFS_DATA_FORK && prealloc)
xfs_inode_set_eofblocks_tag(ip);
if (whichfork == XFS_COW_FORK && (prealloc || aoff < off || alen > len))
xfs_inode_set_cowblocks_tag(ip);
return 0;
out_unreserve_blocks:
xfs_mod_fdblocks(mp, alen, false);
out_unreserve_quota:
if (XFS_IS_QUOTA_ON(mp))
xfs_trans_unreserve_quota_nblks(NULL, ip, (long)alen, 0,
XFS_QMOPT_RES_REGBLKS);
return error;
}
static int
xfs_bmapi_allocate(
struct xfs_bmalloca *bma)
{
struct xfs_mount *mp = bma->ip->i_mount;
int whichfork = xfs_bmapi_whichfork(bma->flags);
struct xfs_ifork *ifp = XFS_IFORK_PTR(bma->ip, whichfork);
int tmp_logflags = 0;
int error;
ASSERT(bma->length > 0);
/*
* For the wasdelay case, we could also just allocate the stuff asked
* for in this bmap call but that wouldn't be as good.
*/
if (bma->wasdel) {
bma->length = (xfs_extlen_t)bma->got.br_blockcount;
bma->offset = bma->got.br_startoff;
xfs_iext_peek_prev_extent(ifp, &bma->icur, &bma->prev);
} else {
bma->length = XFS_FILBLKS_MIN(bma->length, MAXEXTLEN);
if (!bma->eof)
bma->length = XFS_FILBLKS_MIN(bma->length,
bma->got.br_startoff - bma->offset);
}
/*
* Set the data type being allocated. For the data fork, the first data
* in the file is treated differently to all other allocations. For the
* attribute fork, we only need to ensure the allocated range is not on
* the busy list.
*/
if (!(bma->flags & XFS_BMAPI_METADATA)) {
bma->datatype = XFS_ALLOC_NOBUSY;
if (whichfork == XFS_DATA_FORK) {
if (bma->offset == 0)
bma->datatype |= XFS_ALLOC_INITIAL_USER_DATA;
else
bma->datatype |= XFS_ALLOC_USERDATA;
}
if (bma->flags & XFS_BMAPI_ZERO)
bma->datatype |= XFS_ALLOC_USERDATA_ZERO;
}
bma->minlen = (bma->flags & XFS_BMAPI_CONTIG) ? bma->length : 1;
/*
* Only want to do the alignment at the eof if it is userdata and
* allocation length is larger than a stripe unit.
*/
if (mp->m_dalign && bma->length >= mp->m_dalign &&
!(bma->flags & XFS_BMAPI_METADATA) && whichfork == XFS_DATA_FORK) {
error = xfs_bmap_isaeof(bma, whichfork);
if (error)
return error;
}
error = xfs_bmap_alloc(bma);
if (error)
return error;
if (bma->cur)
bma->cur->bc_private.b.firstblock = *bma->firstblock;
if (bma->blkno == NULLFSBLOCK)
return 0;
if ((ifp->if_flags & XFS_IFBROOT) && !bma->cur) {
bma->cur = xfs_bmbt_init_cursor(mp, bma->tp, bma->ip, whichfork);
bma->cur->bc_private.b.firstblock = *bma->firstblock;
bma->cur->bc_private.b.dfops = bma->dfops;
}
/*
* Bump the number of extents we've allocated
* in this call.
*/
bma->nallocs++;
if (bma->cur)
bma->cur->bc_private.b.flags =
bma->wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
bma->got.br_startoff = bma->offset;
bma->got.br_startblock = bma->blkno;
bma->got.br_blockcount = bma->length;
bma->got.br_state = XFS_EXT_NORM;
/*
* In the data fork, a wasdelay extent has been initialized, so
* shouldn't be flagged as unwritten.
*
* For the cow fork, however, we convert delalloc reservations
* (extents allocated for speculative preallocation) to
* allocated unwritten extents, and only convert the unwritten
* extents to real extents when we're about to write the data.
*/
if ((!bma->wasdel || (bma->flags & XFS_BMAPI_COWFORK)) &&
(bma->flags & XFS_BMAPI_PREALLOC) &&
xfs_sb_version_hasextflgbit(&mp->m_sb))
bma->got.br_state = XFS_EXT_UNWRITTEN;
if (bma->wasdel)
error = xfs_bmap_add_extent_delay_real(bma, whichfork);
else
error = xfs_bmap_add_extent_hole_real(bma->tp, bma->ip,
whichfork, &bma->icur, &bma->cur, &bma->got,
bma->firstblock, bma->dfops, &bma->logflags);
bma->logflags |= tmp_logflags;
if (error)
return error;
/*
* Update our extent pointer, given that xfs_bmap_add_extent_delay_real
* or xfs_bmap_add_extent_hole_real might have merged it into one of
* the neighbouring ones.
*/
xfs_iext_get_extent(ifp, &bma->icur, &bma->got);
ASSERT(bma->got.br_startoff <= bma->offset);
ASSERT(bma->got.br_startoff + bma->got.br_blockcount >=
bma->offset + bma->length);
ASSERT(bma->got.br_state == XFS_EXT_NORM ||
bma->got.br_state == XFS_EXT_UNWRITTEN);
return 0;
}
STATIC int
xfs_bmapi_convert_unwritten(
struct xfs_bmalloca *bma,
struct xfs_bmbt_irec *mval,
xfs_filblks_t len,
int flags)
{
int whichfork = xfs_bmapi_whichfork(flags);
struct xfs_ifork *ifp = XFS_IFORK_PTR(bma->ip, whichfork);
int tmp_logflags = 0;
int error;
/* check if we need to do unwritten->real conversion */
if (mval->br_state == XFS_EXT_UNWRITTEN &&
(flags & XFS_BMAPI_PREALLOC))
return 0;
/* check if we need to do real->unwritten conversion */
if (mval->br_state == XFS_EXT_NORM &&
(flags & (XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT)) !=
(XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT))
return 0;
/*
* Modify (by adding) the state flag, if writing.
*/
ASSERT(mval->br_blockcount <= len);
if ((ifp->if_flags & XFS_IFBROOT) && !bma->cur) {
bma->cur = xfs_bmbt_init_cursor(bma->ip->i_mount, bma->tp,
bma->ip, whichfork);
bma->cur->bc_private.b.firstblock = *bma->firstblock;
bma->cur->bc_private.b.dfops = bma->dfops;
}
mval->br_state = (mval->br_state == XFS_EXT_UNWRITTEN)
? XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
/*
* Before insertion into the bmbt, zero the range being converted
* if required.
*/
if (flags & XFS_BMAPI_ZERO) {
error = xfs_zero_extent(bma->ip, mval->br_startblock,
mval->br_blockcount);
if (error)
return error;
}
error = xfs_bmap_add_extent_unwritten_real(bma->tp, bma->ip, whichfork,
&bma->icur, &bma->cur, mval, bma->firstblock,
bma->dfops, &tmp_logflags);
/*
* Log the inode core unconditionally in the unwritten extent conversion
* path because the conversion might not have done so (e.g., if the
* extent count hasn't changed). We need to make sure the inode is dirty
* in the transaction for the sake of fsync(), even if nothing has
* changed, because fsync() will not force the log for this transaction
* unless it sees the inode pinned.
*
* Note: If we're only converting cow fork extents, there aren't
* any on-disk updates to make, so we don't need to log anything.
*/
if (whichfork != XFS_COW_FORK)
bma->logflags |= tmp_logflags | XFS_ILOG_CORE;
if (error)
return error;
/*
* Update our extent pointer, given that
* xfs_bmap_add_extent_unwritten_real might have merged it into one
* of the neighbouring ones.
*/
xfs_iext_get_extent(ifp, &bma->icur, &bma->got);
/*
* We may have combined previously unwritten space with written space,
* so generate another request.
*/
if (mval->br_blockcount < len)
return -EAGAIN;
return 0;
}
/*
* Map file blocks to filesystem blocks, and allocate blocks or convert the
* extent state if necessary. Details behaviour is controlled by the flags
* parameter. Only allocates blocks from a single allocation group, to avoid
* locking problems.
*
* The returned value in "firstblock" from the first call in a transaction
* must be remembered and presented to subsequent calls in "firstblock".
* An upper bound for the number of blocks to be allocated is supplied to
* the first call in "total"; if no allocation group has that many free
* blocks then the call will fail (return NULLFSBLOCK in "firstblock").
*/
int
xfs_bmapi_write(
struct xfs_trans *tp, /* transaction pointer */
struct xfs_inode *ip, /* incore inode */
xfs_fileoff_t bno, /* starting file offs. mapped */
xfs_filblks_t len, /* length to map in file */
int flags, /* XFS_BMAPI_... */
xfs_fsblock_t *firstblock, /* first allocated block
controls a.g. for allocs */
xfs_extlen_t total, /* total blocks needed */
struct xfs_bmbt_irec *mval, /* output: map values */
int *nmap, /* i/o: mval size/count */
struct xfs_defer_ops *dfops) /* i/o: list extents to free */
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp;
struct xfs_bmalloca bma = { NULL }; /* args for xfs_bmap_alloc */
xfs_fileoff_t end; /* end of mapped file region */
bool eof = false; /* after the end of extents */
int error; /* error return */
int n; /* current extent index */
xfs_fileoff_t obno; /* old block number (offset) */
int whichfork; /* data or attr fork */
#ifdef DEBUG
xfs_fileoff_t orig_bno; /* original block number value */
int orig_flags; /* original flags arg value */
xfs_filblks_t orig_len; /* original value of len arg */
struct xfs_bmbt_irec *orig_mval; /* original value of mval */
int orig_nmap; /* original value of *nmap */
orig_bno = bno;
orig_len = len;
orig_flags = flags;
orig_mval = mval;
orig_nmap = *nmap;
#endif
whichfork = xfs_bmapi_whichfork(flags);
ASSERT(*nmap >= 1);
ASSERT(*nmap <= XFS_BMAP_MAX_NMAP);
ASSERT(!(flags & XFS_BMAPI_IGSTATE));
ASSERT(tp != NULL ||
(flags & (XFS_BMAPI_CONVERT | XFS_BMAPI_COWFORK)) ==
(XFS_BMAPI_CONVERT | XFS_BMAPI_COWFORK));
ASSERT(len > 0);
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL);
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ASSERT(!(flags & XFS_BMAPI_REMAP));
/* zeroing is for currently only for data extents, not metadata */
ASSERT((flags & (XFS_BMAPI_METADATA | XFS_BMAPI_ZERO)) !=
(XFS_BMAPI_METADATA | XFS_BMAPI_ZERO));
/*
* we can allocate unwritten extents or pre-zero allocated blocks,
* but it makes no sense to do both at once. This would result in
* zeroing the unwritten extent twice, but it still being an
* unwritten extent....
*/
ASSERT((flags & (XFS_BMAPI_PREALLOC | XFS_BMAPI_ZERO)) !=
(XFS_BMAPI_PREALLOC | XFS_BMAPI_ZERO));
if (unlikely(XFS_TEST_ERROR(
(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
mp, XFS_ERRTAG_BMAPIFORMAT))) {
XFS_ERROR_REPORT("xfs_bmapi_write", XFS_ERRLEVEL_LOW, mp);
return -EFSCORRUPTED;
}
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
ifp = XFS_IFORK_PTR(ip, whichfork);
XFS_STATS_INC(mp, xs_blk_mapw);
if (*firstblock == NULLFSBLOCK) {
if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE)
bma.minleft = be16_to_cpu(ifp->if_broot->bb_level) + 1;
else
bma.minleft = 1;
} else {
bma.minleft = 0;
}
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
error = xfs_iread_extents(tp, ip, whichfork);
if (error)
goto error0;
}
n = 0;
end = bno + len;
obno = bno;
if (!xfs_iext_lookup_extent(ip, ifp, bno, &bma.icur, &bma.got))
eof = true;
if (!xfs_iext_peek_prev_extent(ifp, &bma.icur, &bma.prev))
bma.prev.br_startoff = NULLFILEOFF;
bma.tp = tp;
bma.ip = ip;
bma.total = total;
bma.datatype = 0;
bma.dfops = dfops;
bma.firstblock = firstblock;
while (bno < end && n < *nmap) {
bool need_alloc = false, wasdelay = false;
/* in hole or beyond EOF? */
if (eof || bma.got.br_startoff > bno) {
/*
* CoW fork conversions should /never/ hit EOF or
* holes. There should always be something for us
* to work on.
*/
ASSERT(!((flags & XFS_BMAPI_CONVERT) &&
(flags & XFS_BMAPI_COWFORK)));
if (flags & XFS_BMAPI_DELALLOC) {
/*
* For the COW fork we can reasonably get a
* request for converting an extent that races
* with other threads already having converted
* part of it, as there converting COW to
* regular blocks is not protected using the
* IOLOCK.
*/
ASSERT(flags & XFS_BMAPI_COWFORK);
if (!(flags & XFS_BMAPI_COWFORK)) {
error = -EIO;
goto error0;
}
if (eof || bno >= end)
break;
} else {
need_alloc = true;
}
} else if (isnullstartblock(bma.got.br_startblock)) {
wasdelay = true;
}
/*
* First, deal with the hole before the allocated space
* that we found, if any.
*/
if ((need_alloc || wasdelay) &&
!(flags & XFS_BMAPI_CONVERT_ONLY)) {
bma.eof = eof;
bma.conv = !!(flags & XFS_BMAPI_CONVERT);
bma.wasdel = wasdelay;
bma.offset = bno;
bma.flags = flags;
/*
* There's a 32/64 bit type mismatch between the
* allocation length request (which can be 64 bits in
* length) and the bma length request, which is
* xfs_extlen_t and therefore 32 bits. Hence we have to
* check for 32-bit overflows and handle them here.
*/
if (len > (xfs_filblks_t)MAXEXTLEN)
bma.length = MAXEXTLEN;
else
bma.length = len;
ASSERT(len > 0);
ASSERT(bma.length > 0);
error = xfs_bmapi_allocate(&bma);
if (error)
goto error0;
if (bma.blkno == NULLFSBLOCK)
break;
/*
* If this is a CoW allocation, record the data in
* the refcount btree for orphan recovery.
*/
if (whichfork == XFS_COW_FORK) {
error = xfs_refcount_alloc_cow_extent(mp, dfops,
bma.blkno, bma.length);
if (error)
goto error0;
}
}
/* Deal with the allocated space we found. */
xfs_bmapi_trim_map(mval, &bma.got, &bno, len, obno,
end, n, flags);
/* Execute unwritten extent conversion if necessary */
error = xfs_bmapi_convert_unwritten(&bma, mval, len, flags);
if (error == -EAGAIN)
continue;
if (error)
goto error0;
/* update the extent map to return */
xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
/*
* If we're done, stop now. Stop when we've allocated
* XFS_BMAP_MAX_NMAP extents no matter what. Otherwise
* the transaction may get too big.
*/
if (bno >= end || n >= *nmap || bma.nallocs >= *nmap)
break;
/* Else go on to the next record. */
bma.prev = bma.got;
if (!xfs_iext_next_extent(ifp, &bma.icur, &bma.got))
eof = true;
}
*nmap = n;
/*
* Transform from btree to extents, give it cur.
*/
if (xfs_bmap_wants_extents(ip, whichfork)) {
int tmp_logflags = 0;
ASSERT(bma.cur);
error = xfs_bmap_btree_to_extents(tp, ip, bma.cur,
&tmp_logflags, whichfork);
bma.logflags |= tmp_logflags;
if (error)
goto error0;
}
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE ||
XFS_IFORK_NEXTENTS(ip, whichfork) >
XFS_IFORK_MAXEXT(ip, whichfork));
error = 0;
error0:
/*
* Log everything. Do this after conversion, there's no point in
* logging the extent records if we've converted to btree format.
*/
if ((bma.logflags & xfs_ilog_fext(whichfork)) &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
bma.logflags &= ~xfs_ilog_fext(whichfork);
else if ((bma.logflags & xfs_ilog_fbroot(whichfork)) &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
bma.logflags &= ~xfs_ilog_fbroot(whichfork);
/*
* Log whatever the flags say, even if error. Otherwise we might miss
* detecting a case where the data is changed, there's an error,
* and it's not logged so we don't shutdown when we should.
*/
if (bma.logflags)
xfs_trans_log_inode(tp, ip, bma.logflags);
if (bma.cur) {
if (!error) {
ASSERT(*firstblock == NULLFSBLOCK ||
XFS_FSB_TO_AGNO(mp, *firstblock) <=
XFS_FSB_TO_AGNO(mp,
bma.cur->bc_private.b.firstblock));
*firstblock = bma.cur->bc_private.b.firstblock;
}
xfs_btree_del_cursor(bma.cur,
error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
}
if (!error)
xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval,
orig_nmap, *nmap);
return error;
}
static int
xfs_bmapi_remap(
struct xfs_trans *tp,
struct xfs_inode *ip,
xfs_fileoff_t bno,
xfs_filblks_t len,
xfs_fsblock_t startblock,
struct xfs_defer_ops *dfops)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
struct xfs_btree_cur *cur = NULL;
xfs_fsblock_t firstblock = NULLFSBLOCK;
struct xfs_bmbt_irec got;
struct xfs_iext_cursor icur;
int logflags = 0, error;
ASSERT(len > 0);
ASSERT(len <= (xfs_filblks_t)MAXEXTLEN);
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
if (unlikely(XFS_TEST_ERROR(
(XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_BTREE),
mp, XFS_ERRTAG_BMAPIFORMAT))) {
XFS_ERROR_REPORT("xfs_bmapi_remap", XFS_ERRLEVEL_LOW, mp);
return -EFSCORRUPTED;
}
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
if (error)
return error;
}
if (xfs_iext_lookup_extent(ip, ifp, bno, &icur, &got)) {
/* make sure we only reflink into a hole. */
ASSERT(got.br_startoff > bno);
ASSERT(got.br_startoff - bno >= len);
}
ip->i_d.di_nblocks += len;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
if (ifp->if_flags & XFS_IFBROOT) {
cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK);
cur->bc_private.b.firstblock = firstblock;
cur->bc_private.b.dfops = dfops;
cur->bc_private.b.flags = 0;
}
got.br_startoff = bno;
got.br_startblock = startblock;
got.br_blockcount = len;
got.br_state = XFS_EXT_NORM;
error = xfs_bmap_add_extent_hole_real(tp, ip, XFS_DATA_FORK, &icur,
&cur, &got, &firstblock, dfops, &logflags);
if (error)
goto error0;
if (xfs_bmap_wants_extents(ip, XFS_DATA_FORK)) {
int tmp_logflags = 0;
error = xfs_bmap_btree_to_extents(tp, ip, cur,
&tmp_logflags, XFS_DATA_FORK);
logflags |= tmp_logflags;
}
error0:
if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS)
logflags &= ~XFS_ILOG_DEXT;
else if (ip->i_d.di_format != XFS_DINODE_FMT_BTREE)
logflags &= ~XFS_ILOG_DBROOT;
if (logflags)
xfs_trans_log_inode(tp, ip, logflags);
if (cur) {
xfs_btree_del_cursor(cur,
error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
}
return error;
}
/*
* When a delalloc extent is split (e.g., due to a hole punch), the original
* indlen reservation must be shared across the two new extents that are left
* behind.
*
* Given the original reservation and the worst case indlen for the two new
* extents (as calculated by xfs_bmap_worst_indlen()), split the original
* reservation fairly across the two new extents. If necessary, steal available
* blocks from a deleted extent to make up a reservation deficiency (e.g., if
* ores == 1). The number of stolen blocks is returned. The availability and
* subsequent accounting of stolen blocks is the responsibility of the caller.
*/
static xfs_filblks_t
xfs_bmap_split_indlen(
xfs_filblks_t ores, /* original res. */
xfs_filblks_t *indlen1, /* ext1 worst indlen */
xfs_filblks_t *indlen2, /* ext2 worst indlen */
xfs_filblks_t avail) /* stealable blocks */
{
xfs_filblks_t len1 = *indlen1;
xfs_filblks_t len2 = *indlen2;
xfs_filblks_t nres = len1 + len2; /* new total res. */
xfs_filblks_t stolen = 0;
xfs_filblks_t resfactor;
/*
* Steal as many blocks as we can to try and satisfy the worst case
* indlen for both new extents.
*/
if (ores < nres && avail)
stolen = XFS_FILBLKS_MIN(nres - ores, avail);
ores += stolen;
/* nothing else to do if we've satisfied the new reservation */
if (ores >= nres)
return stolen;
/*
* We can't meet the total required reservation for the two extents.
* Calculate the percent of the overall shortage between both extents
* and apply this percentage to each of the requested indlen values.
* This distributes the shortage fairly and reduces the chances that one
* of the two extents is left with nothing when extents are repeatedly
* split.
*/
resfactor = (ores * 100);
do_div(resfactor, nres);
len1 *= resfactor;
do_div(len1, 100);
len2 *= resfactor;
do_div(len2, 100);
ASSERT(len1 + len2 <= ores);
ASSERT(len1 < *indlen1 && len2 < *indlen2);
/*
* Hand out the remainder to each extent. If one of the two reservations
* is zero, we want to make sure that one gets a block first. The loop
* below starts with len1, so hand len2 a block right off the bat if it
* is zero.
*/
ores -= (len1 + len2);
ASSERT((*indlen1 - len1) + (*indlen2 - len2) >= ores);
if (ores && !len2 && *indlen2) {
len2++;
ores--;
}
while (ores) {
if (len1 < *indlen1) {
len1++;
ores--;
}
if (!ores)
break;
if (len2 < *indlen2) {
len2++;
ores--;
}
}
*indlen1 = len1;
*indlen2 = len2;
return stolen;
}
int
xfs_bmap_del_extent_delay(
struct xfs_inode *ip,
int whichfork,
struct xfs_iext_cursor *icur,
struct xfs_bmbt_irec *got,
struct xfs_bmbt_irec *del)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_bmbt_irec new;
int64_t da_old, da_new, da_diff = 0;
xfs_fileoff_t del_endoff, got_endoff;
xfs_filblks_t got_indlen, new_indlen, stolen;
int state = xfs_bmap_fork_to_state(whichfork);
int error = 0;
bool isrt;
XFS_STATS_INC(mp, xs_del_exlist);
isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
del_endoff = del->br_startoff + del->br_blockcount;
got_endoff = got->br_startoff + got->br_blockcount;
da_old = startblockval(got->br_startblock);
da_new = 0;
ASSERT(del->br_blockcount > 0);
ASSERT(got->br_startoff <= del->br_startoff);
ASSERT(got_endoff >= del_endoff);
if (isrt) {
uint64_t rtexts = XFS_FSB_TO_B(mp, del->br_blockcount);
do_div(rtexts, mp->m_sb.sb_rextsize);
xfs_mod_frextents(mp, rtexts);
}
/*
* Update the inode delalloc counter now and wait to update the
* sb counters as we might have to borrow some blocks for the
* indirect block accounting.
*/
error = xfs_trans_reserve_quota_nblks(NULL, ip,
-((long)del->br_blockcount), 0,
isrt ? XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS);
if (error)
return error;
ip->i_delayed_blks -= del->br_blockcount;
if (got->br_startoff == del->br_startoff)
state |= BMAP_LEFT_FILLING;
if (got_endoff == del_endoff)
state |= BMAP_RIGHT_FILLING;
switch (state & (BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING)) {
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
/*
* Matches the whole extent. Delete the entry.
*/
xfs_iext_remove(ip, icur, state);
xfs_iext_prev(ifp, icur);
break;
case BMAP_LEFT_FILLING:
/*
* Deleting the first part of the extent.
*/
got->br_startoff = del_endoff;
got->br_blockcount -= del->br_blockcount;
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip,
got->br_blockcount), da_old);
got->br_startblock = nullstartblock((int)da_new);
xfs_iext_update_extent(ip, state, icur, got);
break;
case BMAP_RIGHT_FILLING:
/*
* Deleting the last part of the extent.
*/
got->br_blockcount = got->br_blockcount - del->br_blockcount;
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip,
got->br_blockcount), da_old);
got->br_startblock = nullstartblock((int)da_new);
xfs_iext_update_extent(ip, state, icur, got);
break;
case 0:
/*
* Deleting the middle of the extent.
*
* Distribute the original indlen reservation across the two new
* extents. Steal blocks from the deleted extent if necessary.
* Stealing blocks simply fudges the fdblocks accounting below.
* Warn if either of the new indlen reservations is zero as this
* can lead to delalloc problems.
*/
got->br_blockcount = del->br_startoff - got->br_startoff;
got_indlen = xfs_bmap_worst_indlen(ip, got->br_blockcount);
new.br_blockcount = got_endoff - del_endoff;
new_indlen = xfs_bmap_worst_indlen(ip, new.br_blockcount);
WARN_ON_ONCE(!got_indlen || !new_indlen);
stolen = xfs_bmap_split_indlen(da_old, &got_indlen, &new_indlen,
del->br_blockcount);
got->br_startblock = nullstartblock((int)got_indlen);
new.br_startoff = del_endoff;
new.br_state = got->br_state;
new.br_startblock = nullstartblock((int)new_indlen);
xfs_iext_update_extent(ip, state, icur, got);
xfs_iext_next(ifp, icur);
xfs_iext_insert(ip, icur, &new, state);
da_new = got_indlen + new_indlen - stolen;
del->br_blockcount -= stolen;
break;
}
ASSERT(da_old >= da_new);
da_diff = da_old - da_new;
if (!isrt)
da_diff += del->br_blockcount;
if (da_diff)
xfs_mod_fdblocks(mp, da_diff, false);
return error;
}
void
xfs_bmap_del_extent_cow(
struct xfs_inode *ip,
struct xfs_iext_cursor *icur,
struct xfs_bmbt_irec *got,
struct xfs_bmbt_irec *del)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK);
struct xfs_bmbt_irec new;
xfs_fileoff_t del_endoff, got_endoff;
int state = BMAP_COWFORK;
XFS_STATS_INC(mp, xs_del_exlist);
del_endoff = del->br_startoff + del->br_blockcount;
got_endoff = got->br_startoff + got->br_blockcount;
ASSERT(del->br_blockcount > 0);
ASSERT(got->br_startoff <= del->br_startoff);
ASSERT(got_endoff >= del_endoff);
ASSERT(!isnullstartblock(got->br_startblock));
if (got->br_startoff == del->br_startoff)
state |= BMAP_LEFT_FILLING;
if (got_endoff == del_endoff)
state |= BMAP_RIGHT_FILLING;
switch (state & (BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING)) {
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
/*
* Matches the whole extent. Delete the entry.
*/
xfs_iext_remove(ip, icur, state);
xfs_iext_prev(ifp, icur);
break;
case BMAP_LEFT_FILLING:
/*
* Deleting the first part of the extent.
*/
got->br_startoff = del_endoff;
got->br_blockcount -= del->br_blockcount;
got->br_startblock = del->br_startblock + del->br_blockcount;
xfs_iext_update_extent(ip, state, icur, got);
break;
case BMAP_RIGHT_FILLING:
/*
* Deleting the last part of the extent.
*/
got->br_blockcount -= del->br_blockcount;
xfs_iext_update_extent(ip, state, icur, got);
break;
case 0:
/*
* Deleting the middle of the extent.
*/
got->br_blockcount = del->br_startoff - got->br_startoff;
new.br_startoff = del_endoff;
new.br_blockcount = got_endoff - del_endoff;
new.br_state = got->br_state;
new.br_startblock = del->br_startblock + del->br_blockcount;
xfs_iext_update_extent(ip, state, icur, got);
xfs_iext_next(ifp, icur);
xfs_iext_insert(ip, icur, &new, state);
break;
}
ip->i_delayed_blks -= del->br_blockcount;
}
/*
* Called by xfs_bmapi to update file extent records and the btree
* after removing space.
*/
STATIC int /* error */
xfs_bmap_del_extent_real(
xfs_inode_t *ip, /* incore inode pointer */
xfs_trans_t *tp, /* current transaction pointer */
struct xfs_iext_cursor *icur,
struct xfs_defer_ops *dfops, /* list of extents to be freed */
xfs_btree_cur_t *cur, /* if null, not a btree */
xfs_bmbt_irec_t *del, /* data to remove from extents */
int *logflagsp, /* inode logging flags */
int whichfork, /* data or attr fork */
int bflags) /* bmapi flags */
{
xfs_fsblock_t del_endblock=0; /* first block past del */
xfs_fileoff_t del_endoff; /* first offset past del */
int do_fx; /* free extent at end of routine */
int error; /* error return value */
int flags = 0;/* inode logging flags */
struct xfs_bmbt_irec got; /* current extent entry */
xfs_fileoff_t got_endoff; /* first offset past got */
int i; /* temp state */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_mount_t *mp; /* mount structure */
xfs_filblks_t nblks; /* quota/sb block count */
xfs_bmbt_irec_t new; /* new record to be inserted */
/* REFERENCED */
uint qfield; /* quota field to update */
int state = xfs_bmap_fork_to_state(whichfork);
struct xfs_bmbt_irec old;
mp = ip->i_mount;
XFS_STATS_INC(mp, xs_del_exlist);
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(del->br_blockcount > 0);
xfs_iext_get_extent(ifp, icur, &got);
ASSERT(got.br_startoff <= del->br_startoff);
del_endoff = del->br_startoff + del->br_blockcount;
got_endoff = got.br_startoff + got.br_blockcount;
ASSERT(got_endoff >= del_endoff);
ASSERT(!isnullstartblock(got.br_startblock));
qfield = 0;
error = 0;
/*
* If it's the case where the directory code is running with no block
* reservation, and the deleted block is in the middle of its extent,
* and the resulting insert of an extent would cause transformation to
* btree format, then reject it. The calling code will then swap blocks
* around instead. We have to do this now, rather than waiting for the
* conversion to btree format, since the transaction will be dirty then.
*/
if (tp->t_blk_res == 0 &&
XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_NEXTENTS(ip, whichfork) >=
XFS_IFORK_MAXEXT(ip, whichfork) &&
del->br_startoff > got.br_startoff && del_endoff < got_endoff)
return -ENOSPC;
flags = XFS_ILOG_CORE;
if (whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip)) {
xfs_fsblock_t bno;
xfs_filblks_t len;
ASSERT(do_mod(del->br_blockcount, mp->m_sb.sb_rextsize) == 0);
ASSERT(do_mod(del->br_startblock, mp->m_sb.sb_rextsize) == 0);
bno = del->br_startblock;
len = del->br_blockcount;
do_div(bno, mp->m_sb.sb_rextsize);
do_div(len, mp->m_sb.sb_rextsize);
error = xfs_rtfree_extent(tp, bno, (xfs_extlen_t)len);
if (error)
goto done;
do_fx = 0;
nblks = len * mp->m_sb.sb_rextsize;
qfield = XFS_TRANS_DQ_RTBCOUNT;
} else {
do_fx = 1;
nblks = del->br_blockcount;
qfield = XFS_TRANS_DQ_BCOUNT;
}
del_endblock = del->br_startblock + del->br_blockcount;
if (cur) {
error = xfs_bmbt_lookup_eq(cur, &got, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
}
if (got.br_startoff == del->br_startoff)
state |= BMAP_LEFT_FILLING;
if (got_endoff == del_endoff)
state |= BMAP_RIGHT_FILLING;
switch (state & (BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING)) {
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
/*
* Matches the whole extent. Delete the entry.
*/
xfs_iext_remove(ip, icur, state);
xfs_iext_prev(ifp, icur);
XFS_IFORK_NEXT_SET(ip, whichfork,
XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
flags |= XFS_ILOG_CORE;
if (!cur) {
flags |= xfs_ilog_fext(whichfork);
break;
}
if ((error = xfs_btree_delete(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
break;
case BMAP_LEFT_FILLING:
/*
* Deleting the first part of the extent.
*/
got.br_startoff = del_endoff;
got.br_startblock = del_endblock;
got.br_blockcount -= del->br_blockcount;
xfs_iext_update_extent(ip, state, icur, &got);
if (!cur) {
flags |= xfs_ilog_fext(whichfork);
break;
}
error = xfs_bmbt_update(cur, &got);
if (error)
goto done;
break;
case BMAP_RIGHT_FILLING:
/*
* Deleting the last part of the extent.
*/
got.br_blockcount -= del->br_blockcount;
xfs_iext_update_extent(ip, state, icur, &got);
if (!cur) {
flags |= xfs_ilog_fext(whichfork);
break;
}
error = xfs_bmbt_update(cur, &got);
if (error)
goto done;
break;
case 0:
/*
* Deleting the middle of the extent.
*/
old = got;
got.br_blockcount = del->br_startoff - got.br_startoff;
xfs_iext_update_extent(ip, state, icur, &got);
new.br_startoff = del_endoff;
new.br_blockcount = got_endoff - del_endoff;
new.br_state = got.br_state;
new.br_startblock = del_endblock;
flags |= XFS_ILOG_CORE;
if (cur) {
error = xfs_bmbt_update(cur, &got);
if (error)
goto done;
error = xfs_btree_increment(cur, 0, &i);
if (error)
goto done;
cur->bc_rec.b = new;
error = xfs_btree_insert(cur, &i);
if (error && error != -ENOSPC)
goto done;
/*
* If get no-space back from btree insert, it tried a
* split, and we have a zero block reservation. Fix up
* our state and return the error.
*/
if (error == -ENOSPC) {
/*
* Reset the cursor, don't trust it after any
* insert operation.
*/
error = xfs_bmbt_lookup_eq(cur, &got, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
/*
* Update the btree record back
* to the original value.
*/
error = xfs_bmbt_update(cur, &old);
if (error)
goto done;
/*
* Reset the extent record back
* to the original value.
*/
xfs_iext_update_extent(ip, state, icur, &old);
flags = 0;
error = -ENOSPC;
goto done;
}
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
} else
flags |= xfs_ilog_fext(whichfork);
XFS_IFORK_NEXT_SET(ip, whichfork,
XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
xfs_iext_next(ifp, icur);
xfs_iext_insert(ip, icur, &new, state);
break;
}
/* remove reverse mapping */
error = xfs_rmap_unmap_extent(mp, dfops, ip, whichfork, del);
if (error)
goto done;
/*
* If we need to, add to list of extents to delete.
*/
if (do_fx && !(bflags & XFS_BMAPI_REMAP)) {
if (xfs_is_reflink_inode(ip) && whichfork == XFS_DATA_FORK) {
error = xfs_refcount_decrease_extent(mp, dfops, del);
if (error)
goto done;
} else
xfs_bmap_add_free(mp, dfops, del->br_startblock,
del->br_blockcount, NULL);
}
/*
* Adjust inode # blocks in the file.
*/
if (nblks)
ip->i_d.di_nblocks -= nblks;
/*
* Adjust quota data.
*/
if (qfield && !(bflags & XFS_BMAPI_REMAP))
xfs_trans_mod_dquot_byino(tp, ip, qfield, (long)-nblks);
done:
*logflagsp = flags;
return error;
}
/*
* Unmap (remove) blocks from a file.
* If nexts is nonzero then the number of extents to remove is limited to
* that value. If not all extents in the block range can be removed then
* *done is set.
*/
int /* error */
__xfs_bunmapi(
xfs_trans_t *tp, /* transaction pointer */
struct xfs_inode *ip, /* incore inode */
xfs_fileoff_t start, /* first file offset deleted */
xfs_filblks_t *rlen, /* i/o: amount remaining */
int flags, /* misc flags */
xfs_extnum_t nexts, /* number of extents max */
xfs_fsblock_t *firstblock, /* first allocated block
controls a.g. for allocs */
struct xfs_defer_ops *dfops) /* i/o: deferred updates */
{
xfs_btree_cur_t *cur; /* bmap btree cursor */
xfs_bmbt_irec_t del; /* extent being deleted */
int error; /* error return value */
xfs_extnum_t extno; /* extent number in list */
xfs_bmbt_irec_t got; /* current extent record */
xfs_ifork_t *ifp; /* inode fork pointer */
int isrt; /* freeing in rt area */
int logflags; /* transaction logging flags */
xfs_extlen_t mod; /* rt extent offset */
xfs_mount_t *mp; /* mount structure */
int tmp_logflags; /* partial logging flags */
int wasdel; /* was a delayed alloc extent */
int whichfork; /* data or attribute fork */
xfs_fsblock_t sum;
xfs_filblks_t len = *rlen; /* length to unmap in file */
xfs_fileoff_t max_len;
xfs_agnumber_t prev_agno = NULLAGNUMBER, agno;
xfs_fileoff_t end;
struct xfs_iext_cursor icur;
bool done = false;
trace_xfs_bunmap(ip, start, len, flags, _RET_IP_);
whichfork = xfs_bmapi_whichfork(flags);
ASSERT(whichfork != XFS_COW_FORK);
ifp = XFS_IFORK_PTR(ip, whichfork);
if (unlikely(
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
XFS_ERROR_REPORT("xfs_bunmapi", XFS_ERRLEVEL_LOW,
ip->i_mount);
return -EFSCORRUPTED;
}
mp = ip->i_mount;
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ASSERT(len > 0);
ASSERT(nexts >= 0);
/*
* Guesstimate how many blocks we can unmap without running the risk of
* blowing out the transaction with a mix of EFIs and reflink
* adjustments.
*/
if (tp && xfs_is_reflink_inode(ip) && whichfork == XFS_DATA_FORK)
max_len = min(len, xfs_refcount_max_unmap(tp->t_log_res));
else
max_len = len;
if (!(ifp->if_flags & XFS_IFEXTENTS) &&
(error = xfs_iread_extents(tp, ip, whichfork)))
return error;
if (xfs_iext_count(ifp) == 0) {
*rlen = 0;
return 0;
}
XFS_STATS_INC(mp, xs_blk_unmap);
isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
end = start + len;
if (!xfs_iext_lookup_extent_before(ip, ifp, &end, &icur, &got)) {
*rlen = 0;
return 0;
}
end--;
logflags = 0;
if (ifp->if_flags & XFS_IFBROOT) {
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
cur->bc_private.b.firstblock = *firstblock;
cur->bc_private.b.dfops = dfops;
cur->bc_private.b.flags = 0;
} else
cur = NULL;
if (isrt) {
/*
* Synchronize by locking the bitmap inode.
*/
xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL|XFS_ILOCK_RTBITMAP);
xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL|XFS_ILOCK_RTSUM);
xfs_trans_ijoin(tp, mp->m_rsumip, XFS_ILOCK_EXCL);
}
extno = 0;
while (end != (xfs_fileoff_t)-1 && end >= start &&
(nexts == 0 || extno < nexts) && max_len > 0) {
/*
* Is the found extent after a hole in which end lives?
* Just back up to the previous extent, if so.
*/
if (got.br_startoff > end &&
!xfs_iext_prev_extent(ifp, &icur, &got)) {
done = true;
break;
}
/*
* Is the last block of this extent before the range
* we're supposed to delete? If so, we're done.
*/
end = XFS_FILEOFF_MIN(end,
got.br_startoff + got.br_blockcount - 1);
if (end < start)
break;
/*
* Then deal with the (possibly delayed) allocated space
* we found.
*/
del = got;
wasdel = isnullstartblock(del.br_startblock);
/*
* Make sure we don't touch multiple AGF headers out of order
* in a single transaction, as that could cause AB-BA deadlocks.
*/
if (!wasdel) {
agno = XFS_FSB_TO_AGNO(mp, del.br_startblock);
if (prev_agno != NULLAGNUMBER && prev_agno > agno)
break;
prev_agno = agno;
}
if (got.br_startoff < start) {
del.br_startoff = start;
del.br_blockcount -= start - got.br_startoff;
if (!wasdel)
del.br_startblock += start - got.br_startoff;
}
if (del.br_startoff + del.br_blockcount > end + 1)
del.br_blockcount = end + 1 - del.br_startoff;
/* How much can we safely unmap? */
if (max_len < del.br_blockcount) {
del.br_startoff += del.br_blockcount - max_len;
if (!wasdel)
del.br_startblock += del.br_blockcount - max_len;
del.br_blockcount = max_len;
}
sum = del.br_startblock + del.br_blockcount;
if (isrt &&
(mod = do_mod(sum, mp->m_sb.sb_rextsize))) {
/*
* Realtime extent not lined up at the end.
* The extent could have been split into written
* and unwritten pieces, or we could just be
* unmapping part of it. But we can't really
* get rid of part of a realtime extent.
*/
if (del.br_state == XFS_EXT_UNWRITTEN ||
!xfs_sb_version_hasextflgbit(&mp->m_sb)) {
/*
* This piece is unwritten, or we're not
* using unwritten extents. Skip over it.
*/
ASSERT(end >= mod);
end -= mod > del.br_blockcount ?
del.br_blockcount : mod;
if (end < got.br_startoff &&
!xfs_iext_prev_extent(ifp, &icur, &got)) {
done = true;
break;
}
continue;
}
/*
* It's written, turn it unwritten.
* This is better than zeroing it.
*/
ASSERT(del.br_state == XFS_EXT_NORM);
ASSERT(tp->t_blk_res > 0);
/*
* If this spans a realtime extent boundary,
* chop it back to the start of the one we end at.
*/
if (del.br_blockcount > mod) {
del.br_startoff += del.br_blockcount - mod;
del.br_startblock += del.br_blockcount - mod;
del.br_blockcount = mod;
}
del.br_state = XFS_EXT_UNWRITTEN;
error = xfs_bmap_add_extent_unwritten_real(tp, ip,
whichfork, &icur, &cur, &del,
firstblock, dfops, &logflags);
if (error)
goto error0;
goto nodelete;
}
if (isrt && (mod = do_mod(del.br_startblock, mp->m_sb.sb_rextsize))) {
/*
* Realtime extent is lined up at the end but not
* at the front. We'll get rid of full extents if
* we can.
*/
mod = mp->m_sb.sb_rextsize - mod;
if (del.br_blockcount > mod) {
del.br_blockcount -= mod;
del.br_startoff += mod;
del.br_startblock += mod;
} else if ((del.br_startoff == start &&
(del.br_state == XFS_EXT_UNWRITTEN ||
tp->t_blk_res == 0)) ||
!xfs_sb_version_hasextflgbit(&mp->m_sb)) {
/*
* Can't make it unwritten. There isn't
* a full extent here so just skip it.
*/
ASSERT(end >= del.br_blockcount);
end -= del.br_blockcount;
if (got.br_startoff > end &&
!xfs_iext_prev_extent(ifp, &icur, &got)) {
done = true;
break;
}
continue;
} else if (del.br_state == XFS_EXT_UNWRITTEN) {
struct xfs_bmbt_irec prev;
/*
* This one is already unwritten.
* It must have a written left neighbor.
* Unwrite the killed part of that one and
* try again.
*/
if (!xfs_iext_prev_extent(ifp, &icur, &prev))
ASSERT(0);
ASSERT(prev.br_state == XFS_EXT_NORM);
ASSERT(!isnullstartblock(prev.br_startblock));
ASSERT(del.br_startblock ==
prev.br_startblock + prev.br_blockcount);
if (prev.br_startoff < start) {
mod = start - prev.br_startoff;
prev.br_blockcount -= mod;
prev.br_startblock += mod;
prev.br_startoff = start;
}
prev.br_state = XFS_EXT_UNWRITTEN;
error = xfs_bmap_add_extent_unwritten_real(tp,
ip, whichfork, &icur, &cur,
&prev, firstblock, dfops,
&logflags);
if (error)
goto error0;
goto nodelete;
} else {
ASSERT(del.br_state == XFS_EXT_NORM);
del.br_state = XFS_EXT_UNWRITTEN;
error = xfs_bmap_add_extent_unwritten_real(tp,
ip, whichfork, &icur, &cur,
&del, firstblock, dfops,
&logflags);
if (error)
goto error0;
goto nodelete;
}
}
if (wasdel) {
error = xfs_bmap_del_extent_delay(ip, whichfork, &icur,
&got, &del);
} else {
error = xfs_bmap_del_extent_real(ip, tp, &icur, dfops,
cur, &del, &tmp_logflags, whichfork,
flags);
logflags |= tmp_logflags;
}
if (error)
goto error0;
max_len -= del.br_blockcount;
end = del.br_startoff - 1;
nodelete:
/*
* If not done go on to the next (previous) record.
*/
if (end != (xfs_fileoff_t)-1 && end >= start) {
if (!xfs_iext_get_extent(ifp, &icur, &got) ||
(got.br_startoff > end &&
!xfs_iext_prev_extent(ifp, &icur, &got))) {
done = true;
break;
}
extno++;
}
}
if (done || end == (xfs_fileoff_t)-1 || end < start)
*rlen = 0;
else
*rlen = end - start + 1;
/*
* Convert to a btree if necessary.
*/
if (xfs_bmap_needs_btree(ip, whichfork)) {
ASSERT(cur == NULL);
error = xfs_bmap_extents_to_btree(tp, ip, firstblock, dfops,
&cur, 0, &tmp_logflags, whichfork);
logflags |= tmp_logflags;
if (error)
goto error0;
}
/*
* transform from btree to extents, give it cur
*/
else if (xfs_bmap_wants_extents(ip, whichfork)) {
ASSERT(cur != NULL);
error = xfs_bmap_btree_to_extents(tp, ip, cur, &tmp_logflags,
whichfork);
logflags |= tmp_logflags;
if (error)
goto error0;
}
/*
* transform from extents to local?
*/
error = 0;
error0:
/*
* Log everything. Do this after conversion, there's no point in
* logging the extent records if we've converted to btree format.
*/
if ((logflags & xfs_ilog_fext(whichfork)) &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
logflags &= ~xfs_ilog_fext(whichfork);
else if ((logflags & xfs_ilog_fbroot(whichfork)) &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
logflags &= ~xfs_ilog_fbroot(whichfork);
/*
* Log inode even in the error case, if the transaction
* is dirty we'll need to shut down the filesystem.
*/
if (logflags)
xfs_trans_log_inode(tp, ip, logflags);
if (cur) {
if (!error) {
*firstblock = cur->bc_private.b.firstblock;
cur->bc_private.b.allocated = 0;
}
xfs_btree_del_cursor(cur,
error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
}
return error;
}
/* Unmap a range of a file. */
int
xfs_bunmapi(
xfs_trans_t *tp,
struct xfs_inode *ip,
xfs_fileoff_t bno,
xfs_filblks_t len,
int flags,
xfs_extnum_t nexts,
xfs_fsblock_t *firstblock,
struct xfs_defer_ops *dfops,
int *done)
{
int error;
error = __xfs_bunmapi(tp, ip, bno, &len, flags, nexts, firstblock,
dfops);
*done = (len == 0);
return error;
}
/*
* Determine whether an extent shift can be accomplished by a merge with the
* extent that precedes the target hole of the shift.
*/
STATIC bool
xfs_bmse_can_merge(
struct xfs_bmbt_irec *left, /* preceding extent */
struct xfs_bmbt_irec *got, /* current extent to shift */
xfs_fileoff_t shift) /* shift fsb */
{
xfs_fileoff_t startoff;
startoff = got->br_startoff - shift;
/*
* The extent, once shifted, must be adjacent in-file and on-disk with
* the preceding extent.
*/
if ((left->br_startoff + left->br_blockcount != startoff) ||
(left->br_startblock + left->br_blockcount != got->br_startblock) ||
(left->br_state != got->br_state) ||
(left->br_blockcount + got->br_blockcount > MAXEXTLEN))
return false;
return true;
}
/*
* A bmap extent shift adjusts the file offset of an extent to fill a preceding
* hole in the file. If an extent shift would result in the extent being fully
* adjacent to the extent that currently precedes the hole, we can merge with
* the preceding extent rather than do the shift.
*
* This function assumes the caller has verified a shift-by-merge is possible
* with the provided extents via xfs_bmse_can_merge().
*/
STATIC int
xfs_bmse_merge(
struct xfs_inode *ip,
int whichfork,
xfs_fileoff_t shift, /* shift fsb */
struct xfs_iext_cursor *icur,
struct xfs_bmbt_irec *got, /* extent to shift */
struct xfs_bmbt_irec *left, /* preceding extent */
struct xfs_btree_cur *cur,
int *logflags, /* output */
struct xfs_defer_ops *dfops)
{
struct xfs_bmbt_irec new;
xfs_filblks_t blockcount;
int error, i;
struct xfs_mount *mp = ip->i_mount;
blockcount = left->br_blockcount + got->br_blockcount;
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ASSERT(xfs_bmse_can_merge(left, got, shift));
new = *left;
new.br_blockcount = blockcount;
/*
* Update the on-disk extent count, the btree if necessary and log the
* inode.
*/
XFS_IFORK_NEXT_SET(ip, whichfork,
XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
*logflags |= XFS_ILOG_CORE;
if (!cur) {
*logflags |= XFS_ILOG_DEXT;
goto done;
}
/* lookup and remove the extent to merge */
error = xfs_bmbt_lookup_eq(cur, got, &i);
if (error)
return error;
XFS_WANT_CORRUPTED_RETURN(mp, i == 1);
error = xfs_btree_delete(cur, &i);
if (error)
return error;
XFS_WANT_CORRUPTED_RETURN(mp, i == 1);
/* lookup and update size of the previous extent */
error = xfs_bmbt_lookup_eq(cur, left, &i);
if (error)
return error;
XFS_WANT_CORRUPTED_RETURN(mp, i == 1);
error = xfs_bmbt_update(cur, &new);
if (error)
return error;
done:
xfs_iext_remove(ip, icur, 0);
xfs_iext_prev(XFS_IFORK_PTR(ip, whichfork), icur);
xfs_iext_update_extent(ip, xfs_bmap_fork_to_state(whichfork), icur,
&new);
/* update reverse mapping. rmap functions merge the rmaps for us */
error = xfs_rmap_unmap_extent(mp, dfops, ip, whichfork, got);
if (error)
return error;
memcpy(&new, got, sizeof(new));
new.br_startoff = left->br_startoff + left->br_blockcount;
return xfs_rmap_map_extent(mp, dfops, ip, whichfork, &new);
}
static int
xfs_bmap_shift_update_extent(
struct xfs_inode *ip,
int whichfork,
struct xfs_iext_cursor *icur,
struct xfs_bmbt_irec *got,
struct xfs_btree_cur *cur,
int *logflags,
struct xfs_defer_ops *dfops,
xfs_fileoff_t startoff)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_bmbt_irec prev = *got;
int error, i;
*logflags |= XFS_ILOG_CORE;
got->br_startoff = startoff;
if (cur) {
error = xfs_bmbt_lookup_eq(cur, &prev, &i);
if (error)
return error;
XFS_WANT_CORRUPTED_RETURN(mp, i == 1);
error = xfs_bmbt_update(cur, got);
if (error)
return error;
} else {
*logflags |= XFS_ILOG_DEXT;
}
xfs_iext_update_extent(ip, xfs_bmap_fork_to_state(whichfork), icur,
got);
/* update reverse mapping */
error = xfs_rmap_unmap_extent(mp, dfops, ip, whichfork, &prev);
if (error)
return error;
return xfs_rmap_map_extent(mp, dfops, ip, whichfork, got);
}
int
xfs_bmap_collapse_extents(
struct xfs_trans *tp,
struct xfs_inode *ip,
xfs_fileoff_t *next_fsb,
xfs_fileoff_t offset_shift_fsb,
bool *done,
xfs_fileoff_t stop_fsb,
xfs_fsblock_t *firstblock,
struct xfs_defer_ops *dfops)
{
int whichfork = XFS_DATA_FORK;
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_btree_cur *cur = NULL;
struct xfs_bmbt_irec got, prev;
struct xfs_iext_cursor icur;
xfs_fileoff_t new_startoff;
int error = 0;
int logflags = 0;
if (unlikely(XFS_TEST_ERROR(
(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
mp, XFS_ERRTAG_BMAPIFORMAT))) {
XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, mp);
return -EFSCORRUPTED;
}
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL));
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
error = xfs_iread_extents(tp, ip, whichfork);
if (error)
return error;
}
if (ifp->if_flags & XFS_IFBROOT) {
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
cur->bc_private.b.firstblock = *firstblock;
cur->bc_private.b.dfops = dfops;
cur->bc_private.b.flags = 0;
}
if (!xfs_iext_lookup_extent(ip, ifp, *next_fsb, &icur, &got)) {
*done = true;
goto del_cursor;
}
XFS_WANT_CORRUPTED_GOTO(mp, !isnullstartblock(got.br_startblock),
del_cursor);
new_startoff = got.br_startoff - offset_shift_fsb;
if (xfs_iext_peek_prev_extent(ifp, &icur, &prev)) {
if (new_startoff < prev.br_startoff + prev.br_blockcount) {
error = -EINVAL;
goto del_cursor;
}
if (xfs_bmse_can_merge(&prev, &got, offset_shift_fsb)) {
error = xfs_bmse_merge(ip, whichfork, offset_shift_fsb,
&icur, &got, &prev, cur, &logflags,
dfops);
if (error)
goto del_cursor;
goto done;
}
} else {
if (got.br_startoff < offset_shift_fsb) {
error = -EINVAL;
goto del_cursor;
}
}
error = xfs_bmap_shift_update_extent(ip, whichfork, &icur, &got, cur,
&logflags, dfops, new_startoff);
if (error)
goto del_cursor;
done:
if (!xfs_iext_next_extent(ifp, &icur, &got)) {
*done = true;
goto del_cursor;
}
*next_fsb = got.br_startoff;
del_cursor:
if (cur)
xfs_btree_del_cursor(cur,
error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
if (logflags)
xfs_trans_log_inode(tp, ip, logflags);
return error;
}
int
xfs_bmap_insert_extents(
struct xfs_trans *tp,
struct xfs_inode *ip,
xfs_fileoff_t *next_fsb,
xfs_fileoff_t offset_shift_fsb,
bool *done,
xfs_fileoff_t stop_fsb,
xfs_fsblock_t *firstblock,
struct xfs_defer_ops *dfops)
{
int whichfork = XFS_DATA_FORK;
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_btree_cur *cur = NULL;
struct xfs_bmbt_irec got, next;
struct xfs_iext_cursor icur;
xfs_fileoff_t new_startoff;
int error = 0;
int logflags = 0;
if (unlikely(XFS_TEST_ERROR(
(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
mp, XFS_ERRTAG_BMAPIFORMAT))) {
XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, mp);
return -EFSCORRUPTED;
}
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL));
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
error = xfs_iread_extents(tp, ip, whichfork);
if (error)
return error;
}
if (ifp->if_flags & XFS_IFBROOT) {
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
cur->bc_private.b.firstblock = *firstblock;
cur->bc_private.b.dfops = dfops;
cur->bc_private.b.flags = 0;
}
if (*next_fsb == NULLFSBLOCK) {
xfs_iext_last(ifp, &icur);
if (!xfs_iext_get_extent(ifp, &icur, &got) ||
stop_fsb > got.br_startoff) {
*done = true;
goto del_cursor;
}
} else {
if (!xfs_iext_lookup_extent(ip, ifp, *next_fsb, &icur, &got)) {
*done = true;
goto del_cursor;
}
}
XFS_WANT_CORRUPTED_GOTO(mp, !isnullstartblock(got.br_startblock),
del_cursor);
if (stop_fsb >= got.br_startoff + got.br_blockcount) {
error = -EIO;
goto del_cursor;
}
new_startoff = got.br_startoff + offset_shift_fsb;
if (xfs_iext_peek_next_extent(ifp, &icur, &next)) {
if (new_startoff + got.br_blockcount > next.br_startoff) {
error = -EINVAL;
goto del_cursor;
}
/*
* Unlike a left shift (which involves a hole punch), a right
* shift does not modify extent neighbors in any way. We should
* never find mergeable extents in this scenario. Check anyways
* and warn if we encounter two extents that could be one.
*/
if (xfs_bmse_can_merge(&got, &next, offset_shift_fsb))
WARN_ON_ONCE(1);
}
error = xfs_bmap_shift_update_extent(ip, whichfork, &icur, &got, cur,
&logflags, dfops, new_startoff);
if (error)
goto del_cursor;
if (!xfs_iext_prev_extent(ifp, &icur, &got) ||
stop_fsb >= got.br_startoff + got.br_blockcount) {
*done = true;
goto del_cursor;
}
*next_fsb = got.br_startoff;
del_cursor:
if (cur)
xfs_btree_del_cursor(cur,
error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
if (logflags)
xfs_trans_log_inode(tp, ip, logflags);
return error;
}
/*
* Splits an extent into two extents at split_fsb block such that it is the
* first block of the current_ext. @ext is a target extent to be split.
* @split_fsb is a block where the extents is split. If split_fsb lies in a
* hole or the first block of extents, just return 0.
*/
STATIC int
xfs_bmap_split_extent_at(
struct xfs_trans *tp,
struct xfs_inode *ip,
xfs_fileoff_t split_fsb,
xfs_fsblock_t *firstfsb,
struct xfs_defer_ops *dfops)
{
int whichfork = XFS_DATA_FORK;
struct xfs_btree_cur *cur = NULL;
struct xfs_bmbt_irec got;
struct xfs_bmbt_irec new; /* split extent */
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp;
xfs_fsblock_t gotblkcnt; /* new block count for got */
struct xfs_iext_cursor icur;
int error = 0;
int logflags = 0;
int i = 0;
if (unlikely(XFS_TEST_ERROR(
(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
mp, XFS_ERRTAG_BMAPIFORMAT))) {
XFS_ERROR_REPORT("xfs_bmap_split_extent_at",
XFS_ERRLEVEL_LOW, mp);
return -EFSCORRUPTED;
}
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
ifp = XFS_IFORK_PTR(ip, whichfork);
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
/* Read in all the extents */
error = xfs_iread_extents(tp, ip, whichfork);
if (error)
return error;
}
/*
* If there are not extents, or split_fsb lies in a hole we are done.
*/
if (!xfs_iext_lookup_extent(ip, ifp, split_fsb, &icur, &got) ||
got.br_startoff >= split_fsb)
return 0;
gotblkcnt = split_fsb - got.br_startoff;
new.br_startoff = split_fsb;
new.br_startblock = got.br_startblock + gotblkcnt;
new.br_blockcount = got.br_blockcount - gotblkcnt;
new.br_state = got.br_state;
if (ifp->if_flags & XFS_IFBROOT) {
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
cur->bc_private.b.firstblock = *firstfsb;
cur->bc_private.b.dfops = dfops;
cur->bc_private.b.flags = 0;
error = xfs_bmbt_lookup_eq(cur, &got, &i);
if (error)
goto del_cursor;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, del_cursor);
}
got.br_blockcount = gotblkcnt;
xfs_iext_update_extent(ip, xfs_bmap_fork_to_state(whichfork), &icur,
&got);
logflags = XFS_ILOG_CORE;
if (cur) {
error = xfs_bmbt_update(cur, &got);
if (error)
goto del_cursor;
} else
logflags |= XFS_ILOG_DEXT;
/* Add new extent */
xfs_iext_next(ifp, &icur);
xfs_iext_insert(ip, &icur, &new, 0);
XFS_IFORK_NEXT_SET(ip, whichfork,
XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
if (cur) {
error = xfs_bmbt_lookup_eq(cur, &new, &i);
if (error)
goto del_cursor;
XFS_WANT_CORRUPTED_GOTO(mp, i == 0, del_cursor);
error = xfs_btree_insert(cur, &i);
if (error)
goto del_cursor;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, del_cursor);
}
/*
* Convert to a btree if necessary.
*/
if (xfs_bmap_needs_btree(ip, whichfork)) {
int tmp_logflags; /* partial log flag return val */
ASSERT(cur == NULL);
error = xfs_bmap_extents_to_btree(tp, ip, firstfsb, dfops,
&cur, 0, &tmp_logflags, whichfork);
logflags |= tmp_logflags;
}
del_cursor:
if (cur) {
cur->bc_private.b.allocated = 0;
xfs_btree_del_cursor(cur,
error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
}
if (logflags)
xfs_trans_log_inode(tp, ip, logflags);
return error;
}
int
xfs_bmap_split_extent(
struct xfs_inode *ip,
xfs_fileoff_t split_fsb)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_trans *tp;
struct xfs_defer_ops dfops;
xfs_fsblock_t firstfsb;
int error;
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write,
XFS_DIOSTRAT_SPACE_RES(mp, 0), 0, 0, &tp);
if (error)
return error;
xfs_ilock(ip, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
xfs_defer_init(&dfops, &firstfsb);
error = xfs_bmap_split_extent_at(tp, ip, split_fsb,
&firstfsb, &dfops);
if (error)
goto out;
error = xfs_defer_finish(&tp, &dfops);
if (error)
goto out;
return xfs_trans_commit(tp);
out:
xfs_defer_cancel(&dfops);
xfs_trans_cancel(tp);
return error;
}
/* Deferred mapping is only for real extents in the data fork. */
static bool
xfs_bmap_is_update_needed(
struct xfs_bmbt_irec *bmap)
{
return bmap->br_startblock != HOLESTARTBLOCK &&
bmap->br_startblock != DELAYSTARTBLOCK;
}
/* Record a bmap intent. */
static int
__xfs_bmap_add(
struct xfs_mount *mp,
struct xfs_defer_ops *dfops,
enum xfs_bmap_intent_type type,
struct xfs_inode *ip,
int whichfork,
struct xfs_bmbt_irec *bmap)
{
int error;
struct xfs_bmap_intent *bi;
trace_xfs_bmap_defer(mp,
XFS_FSB_TO_AGNO(mp, bmap->br_startblock),
type,
XFS_FSB_TO_AGBNO(mp, bmap->br_startblock),
ip->i_ino, whichfork,
bmap->br_startoff,
bmap->br_blockcount,
bmap->br_state);
bi = kmem_alloc(sizeof(struct xfs_bmap_intent), KM_SLEEP | KM_NOFS);
INIT_LIST_HEAD(&bi->bi_list);
bi->bi_type = type;
bi->bi_owner = ip;
bi->bi_whichfork = whichfork;
bi->bi_bmap = *bmap;
error = xfs_defer_ijoin(dfops, bi->bi_owner);
if (error) {
kmem_free(bi);
return error;
}
xfs_defer_add(dfops, XFS_DEFER_OPS_TYPE_BMAP, &bi->bi_list);
return 0;
}
/* Map an extent into a file. */
int
xfs_bmap_map_extent(
struct xfs_mount *mp,
struct xfs_defer_ops *dfops,
struct xfs_inode *ip,
struct xfs_bmbt_irec *PREV)
{
if (!xfs_bmap_is_update_needed(PREV))
return 0;
return __xfs_bmap_add(mp, dfops, XFS_BMAP_MAP, ip,
XFS_DATA_FORK, PREV);
}
/* Unmap an extent out of a file. */
int
xfs_bmap_unmap_extent(
struct xfs_mount *mp,
struct xfs_defer_ops *dfops,
struct xfs_inode *ip,
struct xfs_bmbt_irec *PREV)
{
if (!xfs_bmap_is_update_needed(PREV))
return 0;
return __xfs_bmap_add(mp, dfops, XFS_BMAP_UNMAP, ip,
XFS_DATA_FORK, PREV);
}
/*
* Process one of the deferred bmap operations. We pass back the
* btree cursor to maintain our lock on the bmapbt between calls.
*/
int
xfs_bmap_finish_one(
struct xfs_trans *tp,
struct xfs_defer_ops *dfops,
struct xfs_inode *ip,
enum xfs_bmap_intent_type type,
int whichfork,
xfs_fileoff_t startoff,
xfs_fsblock_t startblock,
xfs_filblks_t *blockcount,
xfs_exntst_t state)
{
xfs_fsblock_t firstfsb;
int error = 0;
/*
* firstfsb is tied to the transaction lifetime and is used to
* ensure correct AG locking order and schedule work item
* continuations. XFS_BUI_MAX_FAST_EXTENTS (== 1) restricts us
* to only making one bmap call per transaction, so it should
* be safe to have it as a local variable here.
*/
firstfsb = NULLFSBLOCK;
trace_xfs_bmap_deferred(tp->t_mountp,
XFS_FSB_TO_AGNO(tp->t_mountp, startblock), type,
XFS_FSB_TO_AGBNO(tp->t_mountp, startblock),
ip->i_ino, whichfork, startoff, *blockcount, state);
if (WARN_ON_ONCE(whichfork != XFS_DATA_FORK))
return -EFSCORRUPTED;
if (XFS_TEST_ERROR(false, tp->t_mountp,
XFS_ERRTAG_BMAP_FINISH_ONE))
return -EIO;
switch (type) {
case XFS_BMAP_MAP:
error = xfs_bmapi_remap(tp, ip, startoff, *blockcount,
startblock, dfops);
*blockcount = 0;
break;
case XFS_BMAP_UNMAP:
error = __xfs_bunmapi(tp, ip, startoff, blockcount,
XFS_BMAPI_REMAP, 1, &firstfsb, dfops);
break;
default:
ASSERT(0);
error = -EFSCORRUPTED;
}
return error;
}
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