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linux/fs/xfs/xfs_bmap.c
Dave Chinner cf11da9c5d xfs: refine the allocation stack switch 
The allocation stack switch at xfs_bmapi_allocate() has served it's
purpose, but is no longer a sufficient solution to the stack usage
problem we have in the XFS allocation path.

Whilst the kernel stack size is now 16k, that is not a valid reason
for undoing all our "keep stack usage down" modifications. What it
does allow us to do is have the freedom to refine and perfect the
modifications knowing that if we get it wrong it won't blow up in
our faces - we have a safety net now.

This is important because we still have the issue of older kernels
having smaller stacks and that they are still supported and are
demonstrating a wide range of different stack overflows.  Red Hat
has several open bugs for allocation based stack overflows from
directory modifications and direct IO block allocation and these
problems still need to be solved. If we can solve them upstream,
then distro's won't need to bake their own unique solutions.

To that end, I've observed that every allocation based stack
overflow report has had a specific characteristic - it has happened
during or directly after a bmap btree block split. That event
requires a new block to be allocated to the tree, and so we
effectively stack one allocation stack on top of another, and that's
when we get into trouble.

A further observation is that bmap btree block splits are much rarer
than writeback allocation - over a range of different workloads I've
observed the ratio of bmap btree inserts to splits ranges from 100:1
(xfstests run) to 10000:1 (local VM image server with sparse files
that range in the hundreds of thousands to millions of extents).
Either way, bmap btree split events are much, much rarer than
allocation events.

Finally, we have to move the kswapd state to the allocation workqueue
work when allocation is done on behalf of kswapd. This is proving to
cause significant perturbation in performance under memory pressure
and appears to be generating allocation deadlock warnings under some
workloads, so avoiding the use of a workqueue for the majority of
kswapd writeback allocation will minimise the impact of such
behaviour.

Hence it makes sense to move the stack switch to xfs_btree_split()
and only do it for bmap btree splits. Stack switches during
allocation will be much rarer, so there won't be significant
performacne overhead caused by switching stacks. The worse case
stack from all allocation paths will be split, not just writeback.
And the majority of memory allocations will be done in the correct
context (e.g. kswapd) without causing additional latency, and so we
simplify the memory reclaim interactions between processes,
workqueues and kswapd.

The worst stack I've been able to generate with this patch in place
is 5600 bytes deep. It's very revealing because we exit XFS at:

37)     1768      64   kmem_cache_alloc+0x13b/0x170

about 1800 bytes of stack consumed, and the remaining 3800 bytes
(and 36 functions) is memory reclaim, swap and the IO stack. And
this occurs in the inode allocation from an open(O_CREAT) syscall,
not writeback.

The amount of stack being used is much less than I've previously be
able to generate - fs_mark testing has been able to generate stack
usage of around 7k without too much trouble; with this patch it's
only just getting to 5.5k. This is primarily because the metadata
allocation paths (e.g. directory blocks) are no longer causing
double splits on the same stack, and hence now stack tracing is
showing swapping being the worst stack consumer rather than XFS.

Performance of fs_mark inode create workloads is unchanged.
Performance of fs_mark async fsync workloads is consistently good
with context switches reduced by around 150,000/s (30%).
Performance of dbench, streaming IO and postmark is unchanged.
Allocation deadlock warnings have not been seen on the workloads
that generated them since adding this patch.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
2014-07-15 07:08:24 +10:00

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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_inum.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_mount.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_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_dinode.h"
#include "xfs_filestream.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,
xfs_fileoff_t off,
xfs_fsblock_t bno,
xfs_filblks_t len,
int *stat) /* success/failure */
{
cur->bc_rec.b.br_startoff = off;
cur->bc_rec.b.br_startblock = bno;
cur->bc_rec.b.br_blockcount = len;
return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat);
}
STATIC int /* error */
xfs_bmbt_lookup_ge(
struct xfs_btree_cur *cur,
xfs_fileoff_t off,
xfs_fsblock_t bno,
xfs_filblks_t len,
int *stat) /* success/failure */
{
cur->bc_rec.b.br_startoff = off;
cur->bc_rec.b.br_startblock = bno;
cur->bc_rec.b.br_blockcount = len;
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 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 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 [off, bno, len, state].
* This either works (return 0) or gets an EFSCORRUPTED error.
*/
STATIC int
xfs_bmbt_update(
struct xfs_btree_cur *cur,
xfs_fileoff_t off,
xfs_fsblock_t bno,
xfs_filblks_t len,
xfs_exntst_t state)
{
union xfs_btree_rec rec;
xfs_bmbt_disk_set_allf(&rec.bmbt, off, bno, len, state);
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_UUID &&
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;
}
}
/*
* Debug/sanity checking code
*/
STATIC int
xfs_bmap_sanity_check(
struct xfs_mount *mp,
struct xfs_buf *bp,
int level)
{
struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
if (block->bb_magic != cpu_to_be32(XFS_BMAP_CRC_MAGIC) &&
block->bb_magic != cpu_to_be32(XFS_BMAP_MAGIC))
return 0;
if (be16_to_cpu(block->bb_level) != level ||
be16_to_cpu(block->bb_numrecs) == 0 ||
be16_to_cpu(block->bb_numrecs) > mp->m_bmap_dmxr[level != 0])
return 0;
return 1;
}
#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.
*/
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;
}
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 != NULLDFSBNO);
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);
XFS_WANT_CORRUPTED_GOTO(
xfs_bmap_sanity_check(mp, bp, level),
error0);
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(XFS_FSB_SANITY_CHECK(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);
}
if (bp_release) {
bp_release = 0;
xfs_trans_brelse(NULL, 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;
}
/*
* Add bmap trace insert entries for all the contents of the extent records.
*/
void
xfs_bmap_trace_exlist(
xfs_inode_t *ip, /* incore inode pointer */
xfs_extnum_t cnt, /* count of entries in the list */
int whichfork, /* data or attr fork */
unsigned long caller_ip)
{
xfs_extnum_t idx; /* extent record index */
xfs_ifork_t *ifp; /* inode fork pointer */
int state = 0;
if (whichfork == XFS_ATTR_FORK)
state |= BMAP_ATTRFORK;
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(cnt == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
for (idx = 0; idx < cnt; idx++)
trace_xfs_extlist(ip, idx, whichfork, caller_ip);
}
/*
* 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)
#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(
xfs_fsblock_t bno, /* fs block number of extent */
xfs_filblks_t len, /* length of extent */
xfs_bmap_free_t *flist, /* list of extents */
xfs_mount_t *mp) /* mount point structure */
{
xfs_bmap_free_item_t *cur; /* current (next) element */
xfs_bmap_free_item_t *new; /* new element */
xfs_bmap_free_item_t *prev; /* previous 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->xbfi_startblock = bno;
new->xbfi_blockcount = (xfs_extlen_t)len;
for (prev = NULL, cur = flist->xbf_first;
cur != NULL;
prev = cur, cur = cur->xbfi_next) {
if (cur->xbfi_startblock >= bno)
break;
}
if (prev)
prev->xbfi_next = new;
else
flist->xbf_first = new;
new->xbfi_next = cur;
flist->xbf_count++;
}
/*
* Remove the entry "free" from the free item list. Prev points to the
* previous entry, unless "free" is the head of the list.
*/
void
xfs_bmap_del_free(
xfs_bmap_free_t *flist, /* free item list header */
xfs_bmap_free_item_t *prev, /* previous item on list, if any */
xfs_bmap_free_item_t *free) /* list item to be freed */
{
if (prev)
prev->xbfi_next = free->xbfi_next;
else
flist->xbf_first = free->xbfi_next;
flist->xbf_count--;
kmem_zone_free(xfs_bmap_free_item_zone, free);
}
/*
* Free up any items left in the list.
*/
void
xfs_bmap_cancel(
xfs_bmap_free_t *flist) /* list of bmap_free_items */
{
xfs_bmap_free_item_t *free; /* free list item */
xfs_bmap_free_item_t *next;
if (flist->xbf_count == 0)
return;
ASSERT(flist->xbf_first != NULL);
for (free = flist->xbf_first; free; free = next) {
next = free->xbfi_next;
xfs_bmap_del_free(flist, NULL, free);
}
ASSERT(flist->xbf_count == 0);
}
/*
* 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 */
mp = ip->i_mount;
ifp = XFS_IFORK_PTR(ip, whichfork);
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
if ((error = xfs_btree_check_lptr(cur, cbno, 1)))
return error;
#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_bmap_add_free(cbno, 1, cur->bc_private.b.flist, mp);
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 */
xfs_bmap_free_t *flist, /* 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 */
xfs_bmbt_rec_host_t *ep; /* extent record pointer */
int error; /* error return value */
xfs_extnum_t i, cnt; /* extent record index */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_bmbt_key_t *kp; /* root block key pointer */
xfs_mount_t *mp; /* mount structure */
xfs_extnum_t nextents; /* number of file extents */
xfs_bmbt_ptr_t *pp; /* root block address pointer */
mp = ip->i_mount;
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;
if (xfs_sb_version_hascrc(&mp->m_sb))
xfs_btree_init_block_int(mp, block, XFS_BUF_DADDR_NULL,
XFS_BMAP_CRC_MAGIC, 1, 1, ip->i_ino,
XFS_BTREE_LONG_PTRS | XFS_BTREE_CRC_BLOCKS);
else
xfs_btree_init_block_int(mp, block, XFS_BUF_DADDR_NULL,
XFS_BMAP_MAGIC, 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.flist = flist;
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;
args.firstblock = *firstblock;
if (*firstblock == NULLFSBLOCK) {
args.type = XFS_ALLOCTYPE_START_BNO;
args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
} else if (flist->xbf_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;
}
/*
* Allocation can't fail, the space was reserved.
*/
ASSERT(args.fsbno != NULLFSBLOCK);
ASSERT(*firstblock == NULLFSBLOCK ||
args.agno == XFS_FSB_TO_AGNO(mp, *firstblock) ||
(flist->xbf_low &&
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);
if (xfs_sb_version_hascrc(&mp->m_sb))
xfs_btree_init_block_int(mp, ablock, abp->b_bn,
XFS_BMAP_CRC_MAGIC, 0, 0, ip->i_ino,
XFS_BTREE_LONG_PTRS | XFS_BTREE_CRC_BLOCKS);
else
xfs_btree_init_block_int(mp, ablock, abp->b_bn,
XFS_BMAP_MAGIC, 0, 0, ip->i_ino,
XFS_BTREE_LONG_PTRS);
arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
for (cnt = i = 0; i < nextents; i++) {
ep = xfs_iext_get_ext(ifp, i);
if (!isnullstartblock(xfs_bmbt_get_startblock(ep))) {
arp->l0 = cpu_to_be64(ep->l0);
arp->l1 = cpu_to_be64(ep->l1);
arp++; 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(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;
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 */
xfs_bmbt_rec_host_t *ep; /* extent record pointer */
/*
* 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(ip->i_d.di_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_IFEXTIREC)) ==
XFS_IFINLINE);
memset(&args, 0, sizeof(args));
args.tp = tp;
args.mp = ip->i_mount;
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);
/* initialise the block and copy the data */
init_fn(tp, bp, ip, ifp);
/* account for the change in fork size and log everything */
xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);
xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
xfs_bmap_local_to_extents_empty(ip, whichfork);
flags |= XFS_ILOG_CORE;
xfs_iext_add(ifp, 0, 1);
ep = xfs_iext_get_ext(ifp, 0);
xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
trace_xfs_bmap_post_update(ip, 0,
whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0,
_THIS_IP_);
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 */
xfs_bmap_free_t *flist, /* 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.flist = flist;
cur->bc_private.b.firstblock = *firstblock;
if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat)))
goto error0;
/* must be at least one entry */
XFS_WANT_CORRUPTED_GOTO(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 XFS_ERROR(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 */
xfs_bmap_free_t *flist, /* 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, flist, &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 */
xfs_bmap_free_t *flist, /* 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(ip->i_d.di_mode)) {
memset(&dargs, 0, sizeof(dargs));
dargs.geo = ip->i_mount->m_dir_geo;
dargs.dp = ip;
dargs.firstblock = firstblock;
dargs.flist = flist;
dargs.total = dargs.geo->fsbcount;
dargs.whichfork = XFS_DATA_FORK;
dargs.trans = tp;
return xfs_dir2_sf_to_block(&dargs);
}
if (S_ISLNK(ip->i_d.di_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 */
xfs_bmap_free_t flist; /* 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 committed; /* xaction was committed */
int logflags; /* logging flags */
int error; /* error return value */
int cancel_flags = 0;
ASSERT(XFS_IFORK_Q(ip) == 0);
mp = ip->i_mount;
ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
tp = xfs_trans_alloc(mp, XFS_TRANS_ADDAFORK);
blks = XFS_ADDAFORK_SPACE_RES(mp);
if (rsvd)
tp->t_flags |= XFS_TRANS_RESERVE;
error = xfs_trans_reserve(tp, &M_RES(mp)->tr_addafork, blks, 0);
if (error) {
xfs_trans_cancel(tp, 0);
return error;
}
cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
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;
cancel_flags |= XFS_TRANS_ABORT;
if (XFS_IFORK_Q(ip))
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;
}
ASSERT(ip->i_d.di_anextents == 0);
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_UUID:
ip->i_d.di_forkoff = roundup(sizeof(uuid_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 = XFS_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_bmap_init(&flist, &firstblock);
switch (ip->i_d.di_format) {
case XFS_DINODE_FMT_LOCAL:
error = xfs_bmap_add_attrfork_local(tp, ip, &firstblock, &flist,
&logflags);
break;
case XFS_DINODE_FMT_EXTENTS:
error = xfs_bmap_add_attrfork_extents(tp, ip, &firstblock,
&flist, &logflags);
break;
case XFS_DINODE_FMT_BTREE:
error = xfs_bmap_add_attrfork_btree(tp, ip, &firstblock, &flist,
&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)) {
__int64_t sbfields = 0;
spin_lock(&mp->m_sb_lock);
if (!xfs_sb_version_hasattr(&mp->m_sb)) {
xfs_sb_version_addattr(&mp->m_sb);
sbfields |= XFS_SB_VERSIONNUM;
}
if (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2) {
xfs_sb_version_addattr2(&mp->m_sb);
sbfields |= (XFS_SB_VERSIONNUM | XFS_SB_FEATURES2);
}
if (sbfields) {
spin_unlock(&mp->m_sb_lock);
xfs_mod_sb(tp, sbfields);
} else
spin_unlock(&mp->m_sb_lock);
}
error = xfs_bmap_finish(&tp, &flist, &committed);
if (error)
goto bmap_cancel;
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
bmap_cancel:
xfs_bmap_cancel(&flist);
trans_cancel:
xfs_trans_cancel(tp, cancel_flags);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
}
/*
* Internal and external extent tree search functions.
*/
/*
* Read in the extents to if_extents.
* All inode fields are set up by caller, we just traverse the btree
* and copy the records in. If the file system cannot contain unwritten
* extents, the records are checked for no "state" flags.
*/
int /* error */
xfs_bmap_read_extents(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode */
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_exntfmt_t exntf; /* XFS_EXTFMT_NOSTATE, if checking */
xfs_extnum_t i, 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 */
/* REFERENCED */
xfs_extnum_t room; /* number of entries there's room for */
bno = NULLFSBLOCK;
mp = ip->i_mount;
ifp = XFS_IFORK_PTR(ip, whichfork);
exntf = (whichfork != XFS_DATA_FORK) ? XFS_EXTFMT_NOSTATE :
XFS_EXTFMT_INODE(ip);
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);
pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
bno = be64_to_cpu(*pp);
ASSERT(bno != NULLDFSBNO);
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) {
error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
XFS_BMAP_BTREE_REF, &xfs_bmbt_buf_ops);
if (error)
return error;
block = XFS_BUF_TO_BLOCK(bp);
XFS_WANT_CORRUPTED_GOTO(
xfs_bmap_sanity_check(mp, bp, level),
error0);
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(XFS_FSB_SANITY_CHECK(mp, bno), error0);
xfs_trans_brelse(tp, bp);
}
/*
* Here with bp and block set to the leftmost leaf node in the tree.
*/
room = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
i = 0;
/*
* 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;
xfs_extnum_t start;
num_recs = xfs_btree_get_numrecs(block);
if (unlikely(i + num_recs > room)) {
ASSERT(i + num_recs <= room);
xfs_warn(ip->i_mount,
"corrupt dinode %Lu, (btree extents).",
(unsigned long long) ip->i_ino);
XFS_CORRUPTION_ERROR("xfs_bmap_read_extents(1)",
XFS_ERRLEVEL_LOW, ip->i_mount, block);
goto error0;
}
XFS_WANT_CORRUPTED_GOTO(
xfs_bmap_sanity_check(mp, bp, 0),
error0);
/*
* 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);
start = i;
for (j = 0; j < num_recs; j++, i++, frp++) {
xfs_bmbt_rec_host_t *trp = xfs_iext_get_ext(ifp, i);
trp->l0 = be64_to_cpu(frp->l0);
trp->l1 = be64_to_cpu(frp->l1);
}
if (exntf == XFS_EXTFMT_NOSTATE) {
/*
* Check all attribute bmap btree records and
* any "older" data bmap btree records for a
* set bit in the "extent flag" position.
*/
if (unlikely(xfs_check_nostate_extents(ifp,
start, num_recs))) {
XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
XFS_ERRLEVEL_LOW,
ip->i_mount);
goto error0;
}
}
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)
return error;
block = XFS_BUF_TO_BLOCK(bp);
}
ASSERT(i == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
ASSERT(i == XFS_IFORK_NEXTENTS(ip, whichfork));
XFS_BMAP_TRACE_EXLIST(ip, i, whichfork);
return 0;
error0:
xfs_trans_brelse(tp, bp);
return XFS_ERROR(EFSCORRUPTED);
}
/*
* Search the extent records for the entry containing block bno.
* If bno lies in a hole, point to the next entry. If bno lies
* past eof, *eofp will be set, and *prevp will contain the last
* entry (null if none). Else, *lastxp will be set to the index
* of the found entry; *gotp will contain the entry.
*/
STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
xfs_bmap_search_multi_extents(
xfs_ifork_t *ifp, /* inode fork pointer */
xfs_fileoff_t bno, /* block number searched for */
int *eofp, /* out: end of file found */
xfs_extnum_t *lastxp, /* out: last extent index */
xfs_bmbt_irec_t *gotp, /* out: extent entry found */
xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
{
xfs_bmbt_rec_host_t *ep; /* extent record pointer */
xfs_extnum_t lastx; /* last extent index */
/*
* Initialize the extent entry structure to catch access to
* uninitialized br_startblock field.
*/
gotp->br_startoff = 0xffa5a5a5a5a5a5a5LL;
gotp->br_blockcount = 0xa55a5a5a5a5a5a5aLL;
gotp->br_state = XFS_EXT_INVALID;
#if XFS_BIG_BLKNOS
gotp->br_startblock = 0xffffa5a5a5a5a5a5LL;
#else
gotp->br_startblock = 0xffffa5a5;
#endif
prevp->br_startoff = NULLFILEOFF;
ep = xfs_iext_bno_to_ext(ifp, bno, &lastx);
if (lastx > 0) {
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx - 1), prevp);
}
if (lastx < (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
xfs_bmbt_get_all(ep, gotp);
*eofp = 0;
} else {
if (lastx > 0) {
*gotp = *prevp;
}
*eofp = 1;
ep = NULL;
}
*lastxp = lastx;
return ep;
}
/*
* Search the extents list for the inode, for the extent containing bno.
* If bno lies in a hole, point to the next entry. If bno lies past eof,
* *eofp will be set, and *prevp will contain the last entry (null if none).
* Else, *lastxp will be set to the index of the found
* entry; *gotp will contain the entry.
*/
STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
xfs_bmap_search_extents(
xfs_inode_t *ip, /* incore inode pointer */
xfs_fileoff_t bno, /* block number searched for */
int fork, /* data or attr fork */
int *eofp, /* out: end of file found */
xfs_extnum_t *lastxp, /* out: last extent index */
xfs_bmbt_irec_t *gotp, /* out: extent entry found */
xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
{
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_bmbt_rec_host_t *ep; /* extent record pointer */
XFS_STATS_INC(xs_look_exlist);
ifp = XFS_IFORK_PTR(ip, fork);
ep = xfs_bmap_search_multi_extents(ifp, bno, eofp, lastxp, gotp, prevp);
if (unlikely(!(gotp->br_startblock) && (*lastxp != NULLEXTNUM) &&
!(XFS_IS_REALTIME_INODE(ip) && fork == XFS_DATA_FORK))) {
xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO,
"Access to block zero in inode %llu "
"start_block: %llx start_off: %llx "
"blkcnt: %llx extent-state: %x lastx: %x",
(unsigned long long)ip->i_ino,
(unsigned long long)gotp->br_startblock,
(unsigned long long)gotp->br_startoff,
(unsigned long long)gotp->br_blockcount,
gotp->br_state, *lastxp);
*lastxp = NULLEXTNUM;
*eofp = 1;
return NULL;
}
return ep;
}
/*
* Returns the file-relative block number of the first unused block(s)
* in the file with at least "len" logically contiguous blocks free.
* This is the lowest-address hole if the file has holes, else the first block
* past the end of file.
* Return 0 if the file is currently local (in-inode).
*/
int /* error */
xfs_bmap_first_unused(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *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 */
{
int error; /* error return value */
int idx; /* extent record index */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_fileoff_t lastaddr; /* last block number seen */
xfs_fileoff_t lowest; /* lowest useful block */
xfs_fileoff_t max; /* starting useful block */
xfs_fileoff_t off; /* offset for this block */
xfs_extnum_t nextents; /* number of extent entries */
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;
}
ifp = XFS_IFORK_PTR(ip, whichfork);
if (!(ifp->if_flags & XFS_IFEXTENTS) &&
(error = xfs_iread_extents(tp, ip, whichfork)))
return error;
lowest = *first_unused;
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
for (idx = 0, lastaddr = 0, max = lowest; idx < nextents; idx++) {
xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
off = xfs_bmbt_get_startoff(ep);
/*
* See if the hole before this extent will work.
*/
if (off >= lowest + len && off - max >= len) {
*first_unused = max;
return 0;
}
lastaddr = off + xfs_bmbt_get_blockcount(ep);
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(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode */
xfs_fileoff_t *last_block, /* last block */
int whichfork) /* data or attr fork */
{
xfs_fileoff_t bno; /* input file offset */
int eof; /* hit end of file */
xfs_bmbt_rec_host_t *ep; /* pointer to last extent */
int error; /* error return value */
xfs_bmbt_irec_t got; /* current extent value */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_extnum_t lastx; /* last extent used */
xfs_bmbt_irec_t prev; /* previous extent value */
if (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)
return XFS_ERROR(EIO);
if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
*last_block = 0;
return 0;
}
ifp = XFS_IFORK_PTR(ip, whichfork);
if (!(ifp->if_flags & XFS_IFEXTENTS) &&
(error = xfs_iread_extents(tp, ip, whichfork)))
return error;
bno = *last_block - 1;
ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
&prev);
if (eof || xfs_bmbt_get_startoff(ep) > bno) {
if (prev.br_startoff == NULLFILEOFF)
*last_block = 0;
else
*last_block = prev.br_startoff + prev.br_blockcount;
}
/*
* Otherwise *last_block is already the right answer.
*/
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);
int error;
int nextents;
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
error = xfs_iread_extents(tp, ip, whichfork);
if (error)
return error;
}
nextents = ifp->if_bytes / sizeof(xfs_bmbt_rec_t);
if (nextents == 0) {
*is_empty = 1;
return 0;
}
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, nextents - 1), rec);
*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 = 0;
error = xfs_bmap_last_extent(NULL, bma->ip, whichfork, &rec,
&is_empty);
if (error)
return error;
if (is_empty) {
bma->aeof = 1;
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 XFS_ERROR(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_bmbt_rec_host_t *ep; /* ptr to fork's extent */
xfs_ifork_t *ifp; /* inode fork pointer */
int rval; /* return value */
xfs_bmbt_irec_t s; /* internal version of extent */
#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);
ep = xfs_iext_get_ext(ifp, 0);
xfs_bmbt_get_all(ep, &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)
{
struct xfs_bmbt_irec *new = &bma->got;
int diff; /* temp value */
xfs_bmbt_rec_host_t *ep; /* extent entry for idx */
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 = 0;/* state bits, accessed thru macros */
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 */
xfs_filblks_t temp2=0;/* value for da_new calculations */
int tmp_rval; /* partial logging flags */
ifp = XFS_IFORK_PTR(bma->ip, XFS_DATA_FORK);
ASSERT(bma->idx >= 0);
ASSERT(bma->idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec));
ASSERT(!isnullstartblock(new->br_startblock));
ASSERT(!bma->cur ||
(bma->cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL));
XFS_STATS_INC(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.
*/
ep = xfs_iext_get_ext(ifp, bma->idx);
xfs_bmbt_get_all(ep, &PREV);
new_endoff = new->br_startoff + new->br_blockcount;
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 (bma->idx > 0) {
state |= BMAP_LEFT_VALID;
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1), &LEFT);
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 (bma->idx < bma->ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) {
state |= BMAP_RIGHT_VALID;
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx + 1), &RIGHT);
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.
*/
bma->idx--;
trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
LEFT.br_blockcount + PREV.br_blockcount +
RIGHT.br_blockcount);
trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
xfs_iext_remove(bma->ip, bma->idx + 1, 2, state);
bma->ip->i_d.di_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.br_startoff,
RIGHT.br_startblock,
RIGHT.br_blockcount, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
error = xfs_btree_delete(bma->cur, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
error = xfs_btree_decrement(bma->cur, 0, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
LEFT.br_startblock,
LEFT.br_blockcount +
PREV.br_blockcount +
RIGHT.br_blockcount, LEFT.br_state);
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.
*/
bma->idx--;
trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
LEFT.br_blockcount + PREV.br_blockcount);
trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
if (bma->cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(bma->cur, LEFT.br_startoff,
LEFT.br_startblock, LEFT.br_blockcount,
&i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
LEFT.br_startblock,
LEFT.br_blockcount +
PREV.br_blockcount, LEFT.br_state);
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.
*/
trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
xfs_bmbt_set_startblock(ep, new->br_startblock);
xfs_bmbt_set_blockcount(ep,
PREV.br_blockcount + RIGHT.br_blockcount);
trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
if (bma->cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
RIGHT.br_startblock,
RIGHT.br_blockcount, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
error = xfs_bmbt_update(bma->cur, PREV.br_startoff,
new->br_startblock,
PREV.br_blockcount +
RIGHT.br_blockcount, PREV.br_state);
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.
*/
trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
xfs_bmbt_set_startblock(ep, new->br_startblock);
trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
bma->ip->i_d.di_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->br_startoff,
new->br_startblock, new->br_blockcount,
&i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 0, done);
bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
error = xfs_btree_insert(bma->cur, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(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.
*/
trace_xfs_bmap_pre_update(bma->ip, bma->idx - 1, state, _THIS_IP_);
xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx - 1),
LEFT.br_blockcount + new->br_blockcount);
xfs_bmbt_set_startoff(ep,
PREV.br_startoff + new->br_blockcount);
trace_xfs_bmap_post_update(bma->ip, bma->idx - 1, state, _THIS_IP_);
temp = PREV.br_blockcount - new->br_blockcount;
trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
xfs_bmbt_set_blockcount(ep, temp);
if (bma->cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(bma->cur, LEFT.br_startoff,
LEFT.br_startblock, LEFT.br_blockcount,
&i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
LEFT.br_startblock,
LEFT.br_blockcount +
new->br_blockcount,
LEFT.br_state);
if (error)
goto done;
}
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
startblockval(PREV.br_startblock));
xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
bma->idx--;
break;
case BMAP_LEFT_FILLING:
/*
* Filling in the first part of a previous delayed allocation.
* The left neighbor is not contiguous.
*/
trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
xfs_bmbt_set_startoff(ep, new_endoff);
temp = PREV.br_blockcount - new->br_blockcount;
xfs_bmbt_set_blockcount(ep, temp);
xfs_iext_insert(bma->ip, bma->idx, 1, new, state);
bma->ip->i_d.di_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->br_startoff,
new->br_startblock, new->br_blockcount,
&i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 0, done);
bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
error = xfs_btree_insert(bma->cur, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
}
if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
bma->firstblock, bma->flist,
&bma->cur, 1, &tmp_rval, XFS_DATA_FORK);
rval |= tmp_rval;
if (error)
goto done;
}
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));
ep = xfs_iext_get_ext(ifp, bma->idx + 1);
xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
trace_xfs_bmap_post_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
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.
*/
temp = PREV.br_blockcount - new->br_blockcount;
trace_xfs_bmap_pre_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
xfs_bmbt_set_blockcount(ep, temp);
xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, bma->idx + 1),
new->br_startoff, new->br_startblock,
new->br_blockcount + RIGHT.br_blockcount,
RIGHT.br_state);
trace_xfs_bmap_post_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
if (bma->cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
RIGHT.br_startblock,
RIGHT.br_blockcount, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
error = xfs_bmbt_update(bma->cur, new->br_startoff,
new->br_startblock,
new->br_blockcount +
RIGHT.br_blockcount,
RIGHT.br_state);
if (error)
goto done;
}
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
startblockval(PREV.br_startblock));
trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
bma->idx++;
break;
case BMAP_RIGHT_FILLING:
/*
* Filling in the last part of a previous delayed allocation.
* The right neighbor is not contiguous.
*/
temp = PREV.br_blockcount - new->br_blockcount;
trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
xfs_bmbt_set_blockcount(ep, temp);
xfs_iext_insert(bma->ip, bma->idx + 1, 1, new, state);
bma->ip->i_d.di_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->br_startoff,
new->br_startblock, new->br_blockcount,
&i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 0, done);
bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
error = xfs_btree_insert(bma->cur, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
}
if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
bma->firstblock, bma->flist, &bma->cur, 1,
&tmp_rval, XFS_DATA_FORK);
rval |= tmp_rval;
if (error)
goto done;
}
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));
ep = xfs_iext_get_ext(ifp, bma->idx);
xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
bma->idx++;
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
*/
temp = new->br_startoff - PREV.br_startoff;
temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
trace_xfs_bmap_pre_update(bma->ip, bma->idx, 0, _THIS_IP_);
xfs_bmbt_set_blockcount(ep, temp); /* truncate PREV */
LEFT = *new;
RIGHT.br_state = PREV.br_state;
RIGHT.br_startblock = nullstartblock(
(int)xfs_bmap_worst_indlen(bma->ip, temp2));
RIGHT.br_startoff = new_endoff;
RIGHT.br_blockcount = temp2;
/* insert LEFT (r[0]) and RIGHT (r[1]) at the same time */
xfs_iext_insert(bma->ip, bma->idx + 1, 2, &LEFT, state);
bma->ip->i_d.di_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->br_startoff,
new->br_startblock, new->br_blockcount,
&i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 0, done);
bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
error = xfs_btree_insert(bma->cur, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
}
if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
bma->firstblock, bma->flist, &bma->cur,
1, &tmp_rval, XFS_DATA_FORK);
rval |= tmp_rval;
if (error)
goto done;
}
temp = xfs_bmap_worst_indlen(bma->ip, temp);
temp2 = xfs_bmap_worst_indlen(bma->ip, temp2);
diff = (int)(temp + temp2 - startblockval(PREV.br_startblock) -
(bma->cur ? bma->cur->bc_private.b.allocated : 0));
if (diff > 0) {
error = xfs_icsb_modify_counters(bma->ip->i_mount,
XFS_SBS_FDBLOCKS,
-((int64_t)diff), 0);
ASSERT(!error);
if (error)
goto done;
}
ep = xfs_iext_get_ext(ifp, bma->idx);
xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
trace_xfs_bmap_pre_update(bma->ip, bma->idx + 2, state, _THIS_IP_);
xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, bma->idx + 2),
nullstartblock((int)temp2));
trace_xfs_bmap_post_update(bma->ip, bma->idx + 2, state, _THIS_IP_);
bma->idx++;
da_new = temp + temp2;
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);
}
/* convert to a btree if necessary */
if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
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->flist, &bma->cur,
da_old > 0, &tmp_logflags, XFS_DATA_FORK);
bma->logflags |= tmp_logflags;
if (error)
goto done;
}
/* adjust for changes in reserved delayed indirect blocks */
if (da_old || da_new) {
temp = da_new;
if (bma->cur)
temp += bma->cur->bc_private.b.allocated;
ASSERT(temp <= da_old);
if (temp < da_old)
xfs_icsb_modify_counters(bma->ip->i_mount,
XFS_SBS_FDBLOCKS,
(int64_t)(da_old - temp), 0);
}
/* clear out the allocated field, done with it now in any case. */
if (bma->cur)
bma->cur->bc_private.b.allocated = 0;
xfs_bmap_check_leaf_extents(bma->cur, bma->ip, XFS_DATA_FORK);
done:
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 */
xfs_extnum_t *idx, /* extent number to update/insert */
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 */
xfs_bmap_free_t *flist, /* list of extents to be freed */
int *logflagsp) /* inode logging flags */
{
xfs_btree_cur_t *cur; /* btree cursor */
xfs_bmbt_rec_host_t *ep; /* extent entry for idx */
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_exntst_t newext; /* new extent state */
xfs_exntst_t oldext; /* old extent state */
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 = 0;/* state bits, accessed thru macros */
*logflagsp = 0;
cur = *curp;
ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
ASSERT(*idx >= 0);
ASSERT(*idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec));
ASSERT(!isnullstartblock(new->br_startblock));
XFS_STATS_INC(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;
ep = xfs_iext_get_ext(ifp, *idx);
xfs_bmbt_get_all(ep, &PREV);
newext = new->br_state;
oldext = (newext == XFS_EXT_UNWRITTEN) ?
XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
ASSERT(PREV.br_state == oldext);
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 (*idx > 0) {
state |= BMAP_LEFT_VALID;
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &LEFT);
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 == newext &&
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 (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) {
state |= BMAP_RIGHT_VALID;
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx + 1), &RIGHT);
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 &&
newext == 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.
*/
--*idx;
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
LEFT.br_blockcount + PREV.br_blockcount +
RIGHT.br_blockcount);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
xfs_iext_remove(ip, *idx + 1, 2, state);
ip->i_d.di_nextents -= 2;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
RIGHT.br_startblock,
RIGHT.br_blockcount, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_btree_delete(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_btree_decrement(cur, 0, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_btree_delete(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_btree_decrement(cur, 0, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
LEFT.br_startblock,
LEFT.br_blockcount + PREV.br_blockcount +
RIGHT.br_blockcount, LEFT.br_state)))
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.
*/
--*idx;
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
LEFT.br_blockcount + PREV.br_blockcount);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
xfs_iext_remove(ip, *idx + 1, 1, state);
ip->i_d.di_nextents--;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
PREV.br_startblock, PREV.br_blockcount,
&i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_btree_delete(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_btree_decrement(cur, 0, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
LEFT.br_startblock,
LEFT.br_blockcount + PREV.br_blockcount,
LEFT.br_state)))
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.
*/
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
xfs_bmbt_set_blockcount(ep,
PREV.br_blockcount + RIGHT.br_blockcount);
xfs_bmbt_set_state(ep, newext);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
xfs_iext_remove(ip, *idx + 1, 1, state);
ip->i_d.di_nextents--;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
RIGHT.br_startblock,
RIGHT.br_blockcount, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_btree_delete(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_btree_decrement(cur, 0, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_bmbt_update(cur, new->br_startoff,
new->br_startblock,
new->br_blockcount + RIGHT.br_blockcount,
newext)))
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.
*/
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
xfs_bmbt_set_state(ep, newext);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
new->br_startblock, new->br_blockcount,
&i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_bmbt_update(cur, new->br_startoff,
new->br_startblock, new->br_blockcount,
newext)))
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.
*/
trace_xfs_bmap_pre_update(ip, *idx - 1, state, _THIS_IP_);
xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx - 1),
LEFT.br_blockcount + new->br_blockcount);
xfs_bmbt_set_startoff(ep,
PREV.br_startoff + new->br_blockcount);
trace_xfs_bmap_post_update(ip, *idx - 1, state, _THIS_IP_);
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
xfs_bmbt_set_startblock(ep,
new->br_startblock + new->br_blockcount);
xfs_bmbt_set_blockcount(ep,
PREV.br_blockcount - new->br_blockcount);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
--*idx;
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
PREV.br_startblock, PREV.br_blockcount,
&i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_bmbt_update(cur,
PREV.br_startoff + new->br_blockcount,
PREV.br_startblock + new->br_blockcount,
PREV.br_blockcount - new->br_blockcount,
oldext)))
goto done;
if ((error = xfs_btree_decrement(cur, 0, &i)))
goto done;
error = xfs_bmbt_update(cur, LEFT.br_startoff,
LEFT.br_startblock,
LEFT.br_blockcount + new->br_blockcount,
LEFT.br_state);
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.
*/
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
ASSERT(ep && xfs_bmbt_get_state(ep) == oldext);
xfs_bmbt_set_startoff(ep, new_endoff);
xfs_bmbt_set_blockcount(ep,
PREV.br_blockcount - new->br_blockcount);
xfs_bmbt_set_startblock(ep,
new->br_startblock + new->br_blockcount);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
xfs_iext_insert(ip, *idx, 1, new, state);
ip->i_d.di_nextents++;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
PREV.br_startblock, PREV.br_blockcount,
&i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_bmbt_update(cur,
PREV.br_startoff + new->br_blockcount,
PREV.br_startblock + new->br_blockcount,
PREV.br_blockcount - new->br_blockcount,
oldext)))
goto done;
cur->bc_rec.b = *new;
if ((error = xfs_btree_insert(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(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.
*/
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
xfs_bmbt_set_blockcount(ep,
PREV.br_blockcount - new->br_blockcount);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
++*idx;
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
new->br_startoff, new->br_startblock,
new->br_blockcount + RIGHT.br_blockcount, newext);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
PREV.br_startblock,
PREV.br_blockcount, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
PREV.br_startblock,
PREV.br_blockcount - new->br_blockcount,
oldext)))
goto done;
if ((error = xfs_btree_increment(cur, 0, &i)))
goto done;
if ((error = xfs_bmbt_update(cur, new->br_startoff,
new->br_startblock,
new->br_blockcount + RIGHT.br_blockcount,
newext)))
goto done;
}
break;
case BMAP_RIGHT_FILLING:
/*
* Setting the last part of a previous oldext extent to newext.
* The right neighbor is not contiguous.
*/
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
xfs_bmbt_set_blockcount(ep,
PREV.br_blockcount - new->br_blockcount);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
++*idx;
xfs_iext_insert(ip, *idx, 1, new, state);
ip->i_d.di_nextents++;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
PREV.br_startblock, PREV.br_blockcount,
&i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
PREV.br_startblock,
PREV.br_blockcount - new->br_blockcount,
oldext)))
goto done;
if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
new->br_startblock, new->br_blockcount,
&i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 0, done);
cur->bc_rec.b.br_state = XFS_EXT_NORM;
if ((error = xfs_btree_insert(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(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.
*/
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
xfs_bmbt_set_blockcount(ep,
new->br_startoff - PREV.br_startoff);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
r[0] = *new;
r[1].br_startoff = new_endoff;
r[1].br_blockcount =
PREV.br_startoff + PREV.br_blockcount - new_endoff;
r[1].br_startblock = new->br_startblock + new->br_blockcount;
r[1].br_state = oldext;
++*idx;
xfs_iext_insert(ip, *idx, 2, &r[0], state);
ip->i_d.di_nextents += 2;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
PREV.br_startblock, PREV.br_blockcount,
&i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
/* new right extent - oldext */
if ((error = xfs_bmbt_update(cur, r[1].br_startoff,
r[1].br_startblock, r[1].br_blockcount,
r[1].br_state)))
goto done;
/* new left extent - oldext */
cur->bc_rec.b = PREV;
cur->bc_rec.b.br_blockcount =
new->br_startoff - PREV.br_startoff;
if ((error = xfs_btree_insert(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(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.
*/
if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
new->br_startblock, new->br_blockcount,
&i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 0, done);
/* new middle extent - newext */
cur->bc_rec.b.br_state = new->br_state;
if ((error = xfs_btree_insert(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(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);
}
/* convert to a btree if necessary */
if (xfs_bmap_needs_btree(ip, XFS_DATA_FORK)) {
int tmp_logflags; /* partial log flag return val */
ASSERT(cur == NULL);
error = xfs_bmap_extents_to_btree(tp, ip, first, flist, &cur,
0, &tmp_logflags, XFS_DATA_FORK);
*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, XFS_DATA_FORK);
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 */
xfs_extnum_t *idx, /* extent number to update/insert */
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; /* state bits, accessed thru macros */
xfs_filblks_t temp=0; /* temp for indirect calculations */
ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
state = 0;
ASSERT(isnullstartblock(new->br_startblock));
/*
* Check and set flags if this segment has a left neighbor
*/
if (*idx > 0) {
state |= BMAP_LEFT_VALID;
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &left);
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 (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
state |= BMAP_RIGHT_VALID;
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx), &right);
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.
*/
--*idx;
temp = left.br_blockcount + new->br_blockcount +
right.br_blockcount;
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
oldlen = startblockval(left.br_startblock) +
startblockval(new->br_startblock) +
startblockval(right.br_startblock);
newlen = xfs_bmap_worst_indlen(ip, temp);
xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
nullstartblock((int)newlen));
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
xfs_iext_remove(ip, *idx + 1, 1, state);
break;
case BMAP_LEFT_CONTIG:
/*
* New allocation is contiguous with a delayed allocation
* on the left.
* Merge the new allocation with the left neighbor.
*/
--*idx;
temp = left.br_blockcount + new->br_blockcount;
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
oldlen = startblockval(left.br_startblock) +
startblockval(new->br_startblock);
newlen = xfs_bmap_worst_indlen(ip, temp);
xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
nullstartblock((int)newlen));
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
break;
case BMAP_RIGHT_CONTIG:
/*
* New allocation is contiguous with a delayed allocation
* on the right.
* Merge the new allocation with the right neighbor.
*/
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
temp = new->br_blockcount + right.br_blockcount;
oldlen = startblockval(new->br_startblock) +
startblockval(right.br_startblock);
newlen = xfs_bmap_worst_indlen(ip, temp);
xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
new->br_startoff,
nullstartblock((int)newlen), temp, right.br_state);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
break;
case 0:
/*
* New allocation is not contiguous with another
* delayed allocation.
* Insert a new entry.
*/
oldlen = newlen = 0;
xfs_iext_insert(ip, *idx, 1, new, state);
break;
}
if (oldlen != newlen) {
ASSERT(oldlen > newlen);
xfs_icsb_modify_counters(ip->i_mount, XFS_SBS_FDBLOCKS,
(int64_t)(oldlen - newlen), 0);
/*
* 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_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_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; /* state bits, accessed thru macros */
ifp = XFS_IFORK_PTR(bma->ip, whichfork);
ASSERT(bma->idx >= 0);
ASSERT(bma->idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec));
ASSERT(!isnullstartblock(new->br_startblock));
ASSERT(!bma->cur ||
!(bma->cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL));
XFS_STATS_INC(xs_add_exlist);
state = 0;
if (whichfork == XFS_ATTR_FORK)
state |= BMAP_ATTRFORK;
/*
* Check and set flags if this segment has a left neighbor.
*/
if (bma->idx > 0) {
state |= BMAP_LEFT_VALID;
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1), &left);
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 (bma->idx < ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
state |= BMAP_RIGHT_VALID;
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &right);
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.
*/
--bma->idx;
trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
left.br_blockcount + new->br_blockcount +
right.br_blockcount);
trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
XFS_IFORK_NEXT_SET(bma->ip, whichfork,
XFS_IFORK_NEXTENTS(bma->ip, whichfork) - 1);
if (bma->cur == NULL) {
rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
} else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(bma->cur, right.br_startoff,
right.br_startblock, right.br_blockcount,
&i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
error = xfs_btree_delete(bma->cur, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
error = xfs_btree_decrement(bma->cur, 0, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
error = xfs_bmbt_update(bma->cur, left.br_startoff,
left.br_startblock,
left.br_blockcount +
new->br_blockcount +
right.br_blockcount,
left.br_state);
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.
*/
--bma->idx;
trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
left.br_blockcount + new->br_blockcount);
trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
if (bma->cur == NULL) {
rval = xfs_ilog_fext(whichfork);
} else {
rval = 0;
error = xfs_bmbt_lookup_eq(bma->cur, left.br_startoff,
left.br_startblock, left.br_blockcount,
&i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
error = xfs_bmbt_update(bma->cur, left.br_startoff,
left.br_startblock,
left.br_blockcount +
new->br_blockcount,
left.br_state);
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.
*/
trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, bma->idx),
new->br_startoff, new->br_startblock,
new->br_blockcount + right.br_blockcount,
right.br_state);
trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
if (bma->cur == NULL) {
rval = xfs_ilog_fext(whichfork);
} else {
rval = 0;
error = xfs_bmbt_lookup_eq(bma->cur,
right.br_startoff,
right.br_startblock,
right.br_blockcount, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
error = xfs_bmbt_update(bma->cur, new->br_startoff,
new->br_startblock,
new->br_blockcount +
right.br_blockcount,
right.br_state);
if (error)
goto done;
}
break;
case 0:
/*
* New allocation is not contiguous with another
* real allocation.
* Insert a new entry.
*/
xfs_iext_insert(bma->ip, bma->idx, 1, new, state);
XFS_IFORK_NEXT_SET(bma->ip, whichfork,
XFS_IFORK_NEXTENTS(bma->ip, whichfork) + 1);
if (bma->cur == NULL) {
rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
} else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(bma->cur,
new->br_startoff,
new->br_startblock,
new->br_blockcount, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 0, done);
bma->cur->bc_rec.b.br_state = new->br_state;
error = xfs_btree_insert(bma->cur, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
}
break;
}
/* 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->flist, &bma->cur,
0, &tmp_logflags, whichfork);
bma->logflags |= tmp_logflags;
if (error)
goto done;
}
/* clear out the allocated field, done with it now in any case. */
if (bma->cur)
bma->cur->bc_private.b.allocated = 0;
xfs_bmap_check_leaf_extents(bma->cur, bma->ip, whichfork);
done:
bma->logflags |= 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.
*/
if ((temp = (align_alen % extsz))) {
align_alen += extsz - temp;
}
/*
* 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 XFS_ERROR(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 XFS_ERROR(EINVAL);
} else {
ASSERT(orig_off >= align_off);
ASSERT(orig_end <= align_off + align_alen);
}
#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) && ap->userdata;
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);
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;
}
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; /* minimum allocation alignment */
xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
xfs_agnumber_t ag;
xfs_alloc_arg_t args;
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);
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;
align = ap->userdata ? xfs_get_extsz_hint(ap->ip) : 0;
if (unlikely(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 (ap->userdata && 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;
/* Trim the allocation back to the maximum an AG can fit. */
args.maxlen = MIN(ap->length, XFS_ALLOC_AG_MAX_USABLE(mp));
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 (ap->userdata && 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->flist->xbf_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 (unlikely(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_CACHE_SIZE) {
args.prod = 1;
args.mod = 0;
} else {
args.prod = PAGE_CACHE_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->flist->xbf_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.isfl = 0;
args.userdata = ap->userdata;
if ((error = xfs_alloc_vextent(&args)))
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;
args.minleft = 0;
if ((error = xfs_alloc_vextent(&args)))
return error;
ap->flist->xbf_low = 1;
}
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->flist->xbf_low &&
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->flist->xbf_low && fb_agno < args.agno));
ap->length = args.len;
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;
/*
* Adjust the disk quota also. This was reserved
* earlier.
*/
xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
XFS_TRANS_DQ_BCOUNT,
(long) args.len);
} 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) && ap->userdata)
return xfs_bmap_rtalloc(ap);
return xfs_bmap_btalloc(ap);
}
/*
* 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;
struct xfs_bmbt_irec prev;
xfs_fileoff_t obno;
xfs_fileoff_t end;
xfs_extnum_t lastx;
int error;
int eof;
int n = 0;
int whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
XFS_ATTR_FORK : XFS_DATA_FORK;
ASSERT(*nmap >= 1);
ASSERT(!(flags & ~(XFS_BMAPI_ATTRFORK|XFS_BMAPI_ENTIRE|
XFS_BMAPI_IGSTATE)));
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_RANDOM_BMAPIFORMAT))) {
XFS_ERROR_REPORT("xfs_bmapi_read", XFS_ERRLEVEL_LOW, mp);
return XFS_ERROR(EFSCORRUPTED);
}
if (XFS_FORCED_SHUTDOWN(mp))
return XFS_ERROR(EIO);
XFS_STATS_INC(xs_blk_mapr);
ifp = XFS_IFORK_PTR(ip, whichfork);
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
error = xfs_iread_extents(NULL, ip, whichfork);
if (error)
return error;
}
xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got, &prev);
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 (++lastx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t))
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx), &got);
else
eof = 1;
}
*nmap = n;
return 0;
}
STATIC int
xfs_bmapi_reserve_delalloc(
struct xfs_inode *ip,
xfs_fileoff_t aoff,
xfs_filblks_t len,
struct xfs_bmbt_irec *got,
struct xfs_bmbt_irec *prev,
xfs_extnum_t *lastx,
int eof)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
xfs_extlen_t alen;
xfs_extlen_t indlen;
char rt = XFS_IS_REALTIME_INODE(ip);
xfs_extlen_t extsz;
int error;
alen = XFS_FILBLKS_MIN(len, MAXEXTLEN);
if (!eof)
alen = XFS_FILBLKS_MIN(alen, got->br_startoff - aoff);
/* Figure out the extent size, adjust alen */
extsz = xfs_get_extsz_hint(ip);
if (extsz) {
/*
* Make sure we don't exceed a single extent length when we
* align the extent by reducing length we are going to
* allocate by the maximum amount extent size aligment may
* require.
*/
alen = XFS_FILBLKS_MIN(len, MAXEXTLEN - (2 * extsz - 1));
error = xfs_bmap_extsize_align(mp, got, prev, extsz, rt, eof,
1, 0, &aoff, &alen);
ASSERT(!error);
}
if (rt)
extsz = alen / mp->m_sb.sb_rextsize;
/*
* 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,
rt ? XFS_QMOPT_RES_RTBLKS : 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);
if (rt) {
error = xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS,
-((int64_t)extsz), 0);
} else {
error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
-((int64_t)alen), 0);
}
if (error)
goto out_unreserve_quota;
error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
-((int64_t)indlen), 0);
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, lastx, got);
/*
* Update our extent pointer, given that xfs_bmap_add_extent_hole_delay
* might have merged it into one of the neighbouring ones.
*/
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *lastx), got);
ASSERT(got->br_startoff <= aoff);
ASSERT(got->br_startoff + got->br_blockcount >= aoff + alen);
ASSERT(isnullstartblock(got->br_startblock));
ASSERT(got->br_state == XFS_EXT_NORM);
return 0;
out_unreserve_blocks:
if (rt)
xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS, extsz, 0);
else
xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS, alen, 0);
out_unreserve_quota:
if (XFS_IS_QUOTA_ON(mp))
xfs_trans_unreserve_quota_nblks(NULL, ip, (long)alen, 0, rt ?
XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS);
return error;
}
/*
* Map file blocks to filesystem blocks, adding delayed allocations as needed.
*/
int
xfs_bmapi_delay(
struct xfs_inode *ip, /* incore inode */
xfs_fileoff_t bno, /* starting file offs. mapped */
xfs_filblks_t len, /* length to map in file */
struct xfs_bmbt_irec *mval, /* output: map values */
int *nmap, /* i/o: mval size/count */
int flags) /* XFS_BMAPI_... */
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
struct xfs_bmbt_irec got; /* current file extent record */
struct xfs_bmbt_irec prev; /* previous file extent record */
xfs_fileoff_t obno; /* old block number (offset) */
xfs_fileoff_t end; /* end of mapped file region */
xfs_extnum_t lastx; /* last useful extent number */
int eof; /* we've hit the end of extents */
int n = 0; /* current extent index */
int error = 0;
ASSERT(*nmap >= 1);
ASSERT(*nmap <= XFS_BMAP_MAX_NMAP);
ASSERT(!(flags & ~XFS_BMAPI_ENTIRE));
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_RANDOM_BMAPIFORMAT))) {
XFS_ERROR_REPORT("xfs_bmapi_delay", XFS_ERRLEVEL_LOW, mp);
return XFS_ERROR(EFSCORRUPTED);
}
if (XFS_FORCED_SHUTDOWN(mp))
return XFS_ERROR(EIO);
XFS_STATS_INC(xs_blk_mapw);
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
if (error)
return error;
}
xfs_bmap_search_extents(ip, bno, XFS_DATA_FORK, &eof, &lastx, &got, &prev);
end = bno + len;
obno = bno;
while (bno < end && n < *nmap) {
if (eof || got.br_startoff > bno) {
error = xfs_bmapi_reserve_delalloc(ip, bno, len, &got,
&prev, &lastx, eof);
if (error) {
if (n == 0) {
*nmap = 0;
return error;
}
break;
}
}
/* 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. */
prev = got;
if (++lastx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t))
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx), &got);
else
eof = 1;
}
*nmap = n;
return 0;
}
static int
xfs_bmapi_allocate(
struct xfs_bmalloca *bma)
{
struct xfs_mount *mp = bma->ip->i_mount;
int whichfork = (bma->flags & XFS_BMAPI_ATTRFORK) ?
XFS_ATTR_FORK : XFS_DATA_FORK;
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;
if (bma->idx != NULLEXTNUM && bma->idx) {
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1),
&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);
}
/*
* Indicate if this is the first user data in the file, or just any
* user data.
*/
if (!(bma->flags & XFS_BMAPI_METADATA)) {
bma->userdata = (bma->offset == 0) ?
XFS_ALLOC_INITIAL_USER_DATA : XFS_ALLOC_USERDATA;
}
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->flist->xbf_low)
bma->minleft = 0;
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.flist = bma->flist;
}
/*
* 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;
/*
* A wasdelay extent has been initialized, so shouldn't be flagged
* as unwritten.
*/
if (!bma->wasdel && (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);
else
error = xfs_bmap_add_extent_hole_real(bma, whichfork);
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_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &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 = (flags & XFS_BMAPI_ATTRFORK) ?
XFS_ATTR_FORK : XFS_DATA_FORK;
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.flist = bma->flist;
}
mval->br_state = (mval->br_state == XFS_EXT_UNWRITTEN)
? XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
error = xfs_bmap_add_extent_unwritten_real(bma->tp, bma->ip, &bma->idx,
&bma->cur, mval, bma->firstblock, bma->flist,
&tmp_logflags);
bma->logflags |= tmp_logflags;
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_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &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_bmap_free *flist) /* 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 */
int eof; /* 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 */
char inhole; /* current location is hole in file */
char wasdelay; /* old extent was delayed */
#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 = (flags & XFS_BMAPI_ATTRFORK) ?
XFS_ATTR_FORK : XFS_DATA_FORK;
ASSERT(*nmap >= 1);
ASSERT(*nmap <= XFS_BMAP_MAX_NMAP);
ASSERT(!(flags & XFS_BMAPI_IGSTATE));
ASSERT(tp != NULL);
ASSERT(len > 0);
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL);
ASSERT(xfs_isilocked(ip, 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_RANDOM_BMAPIFORMAT))) {
XFS_ERROR_REPORT("xfs_bmapi_write", XFS_ERRLEVEL_LOW, mp);
return XFS_ERROR(EFSCORRUPTED);
}
if (XFS_FORCED_SHUTDOWN(mp))
return XFS_ERROR(EIO);
ifp = XFS_IFORK_PTR(ip, whichfork);
XFS_STATS_INC(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;
}
xfs_bmap_search_extents(ip, bno, whichfork, &eof, &bma.idx, &bma.got,
&bma.prev);
n = 0;
end = bno + len;
obno = bno;
bma.tp = tp;
bma.ip = ip;
bma.total = total;
bma.userdata = 0;
bma.flist = flist;
bma.firstblock = firstblock;
while (bno < end && n < *nmap) {
inhole = eof || bma.got.br_startoff > bno;
wasdelay = !inhole && isnullstartblock(bma.got.br_startblock);
/*
* First, deal with the hole before the allocated space
* that we found, if any.
*/
if (inhole || wasdelay) {
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;
}
/* 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 (++bma.idx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t)) {
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma.idx),
&bma.got);
} else
eof = 1;
}
*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) ||
(flist->xbf_low &&
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;
}
/*
* Called by xfs_bmapi to update file extent records and the btree
* after removing space (or undoing a delayed allocation).
*/
STATIC int /* error */
xfs_bmap_del_extent(
xfs_inode_t *ip, /* incore inode pointer */
xfs_trans_t *tp, /* current transaction pointer */
xfs_extnum_t *idx, /* extent number to update/delete */
xfs_bmap_free_t *flist, /* 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 */
{
xfs_filblks_t da_new; /* new delay-alloc indirect blocks */
xfs_filblks_t da_old; /* old delay-alloc indirect blocks */
xfs_fsblock_t del_endblock=0; /* first block past del */
xfs_fileoff_t del_endoff; /* first offset past del */
int delay; /* current block is delayed allocated */
int do_fx; /* free extent at end of routine */
xfs_bmbt_rec_host_t *ep; /* current extent entry pointer */
int error; /* error return value */
int flags; /* inode logging flags */
xfs_bmbt_irec_t 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 */
xfs_filblks_t temp; /* for indirect length calculations */
xfs_filblks_t temp2; /* for indirect length calculations */
int state = 0;
XFS_STATS_INC(xs_del_exlist);
if (whichfork == XFS_ATTR_FORK)
state |= BMAP_ATTRFORK;
mp = ip->i_mount;
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT((*idx >= 0) && (*idx < ifp->if_bytes /
(uint)sizeof(xfs_bmbt_rec_t)));
ASSERT(del->br_blockcount > 0);
ep = xfs_iext_get_ext(ifp, *idx);
xfs_bmbt_get_all(ep, &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);
delay = isnullstartblock(got.br_startblock);
ASSERT(isnullstartblock(del->br_startblock) == delay);
flags = 0;
qfield = 0;
error = 0;
/*
* If deleting a real allocation, must free up the disk space.
*/
if (!delay) {
flags = XFS_ILOG_CORE;
/*
* Realtime allocation. Free it and record di_nblocks update.
*/
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;
}
/*
* Ordinary allocation.
*/
else {
do_fx = 1;
nblks = del->br_blockcount;
qfield = XFS_TRANS_DQ_BCOUNT;
}
/*
* Set up del_endblock and cur for later.
*/
del_endblock = del->br_startblock + del->br_blockcount;
if (cur) {
if ((error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
got.br_startblock, got.br_blockcount,
&i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
}
da_old = da_new = 0;
} else {
da_old = startblockval(got.br_startblock);
da_new = 0;
nblks = 0;
do_fx = 0;
}
/*
* Set flag value to use in switch statement.
* Left-contig is 2, right-contig is 1.
*/
switch (((got.br_startoff == del->br_startoff) << 1) |
(got_endoff == del_endoff)) {
case 3:
/*
* Matches the whole extent. Delete the entry.
*/
xfs_iext_remove(ip, *idx, 1,
whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0);
--*idx;
if (delay)
break;
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(i == 1, done);
break;
case 2:
/*
* Deleting the first part of the extent.
*/
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
xfs_bmbt_set_startoff(ep, del_endoff);
temp = got.br_blockcount - del->br_blockcount;
xfs_bmbt_set_blockcount(ep, temp);
if (delay) {
temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
da_old);
xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
da_new = temp;
break;
}
xfs_bmbt_set_startblock(ep, del_endblock);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
if (!cur) {
flags |= xfs_ilog_fext(whichfork);
break;
}
if ((error = xfs_bmbt_update(cur, del_endoff, del_endblock,
got.br_blockcount - del->br_blockcount,
got.br_state)))
goto done;
break;
case 1:
/*
* Deleting the last part of the extent.
*/
temp = got.br_blockcount - del->br_blockcount;
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
xfs_bmbt_set_blockcount(ep, temp);
if (delay) {
temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
da_old);
xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
da_new = temp;
break;
}
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
if (!cur) {
flags |= xfs_ilog_fext(whichfork);
break;
}
if ((error = xfs_bmbt_update(cur, got.br_startoff,
got.br_startblock,
got.br_blockcount - del->br_blockcount,
got.br_state)))
goto done;
break;
case 0:
/*
* Deleting the middle of the extent.
*/
temp = del->br_startoff - got.br_startoff;
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
xfs_bmbt_set_blockcount(ep, temp);
new.br_startoff = del_endoff;
temp2 = got_endoff - del_endoff;
new.br_blockcount = temp2;
new.br_state = got.br_state;
if (!delay) {
new.br_startblock = del_endblock;
flags |= XFS_ILOG_CORE;
if (cur) {
if ((error = xfs_bmbt_update(cur,
got.br_startoff,
got.br_startblock, temp,
got.br_state)))
goto done;
if ((error = xfs_btree_increment(cur, 0, &i)))
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.
*/
if ((error = xfs_bmbt_lookup_eq(cur,
got.br_startoff,
got.br_startblock,
temp, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
/*
* Update the btree record back
* to the original value.
*/
if ((error = xfs_bmbt_update(cur,
got.br_startoff,
got.br_startblock,
got.br_blockcount,
got.br_state)))
goto done;
/*
* Reset the extent record back
* to the original value.
*/
xfs_bmbt_set_blockcount(ep,
got.br_blockcount);
flags = 0;
error = XFS_ERROR(ENOSPC);
goto done;
}
XFS_WANT_CORRUPTED_GOTO(i == 1, done);
} else
flags |= xfs_ilog_fext(whichfork);
XFS_IFORK_NEXT_SET(ip, whichfork,
XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
} else {
ASSERT(whichfork == XFS_DATA_FORK);
temp = xfs_bmap_worst_indlen(ip, temp);
xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
temp2 = xfs_bmap_worst_indlen(ip, temp2);
new.br_startblock = nullstartblock((int)temp2);
da_new = temp + temp2;
while (da_new > da_old) {
if (temp) {
temp--;
da_new--;
xfs_bmbt_set_startblock(ep,
nullstartblock((int)temp));
}
if (da_new == da_old)
break;
if (temp2) {
temp2--;
da_new--;
new.br_startblock =
nullstartblock((int)temp2);
}
}
}
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
xfs_iext_insert(ip, *idx + 1, 1, &new, state);
++*idx;
break;
}
/*
* If we need to, add to list of extents to delete.
*/
if (do_fx)
xfs_bmap_add_free(del->br_startblock, del->br_blockcount, flist,
mp);
/*
* Adjust inode # blocks in the file.
*/
if (nblks)
ip->i_d.di_nblocks -= nblks;
/*
* Adjust quota data.
*/
if (qfield)
xfs_trans_mod_dquot_byino(tp, ip, qfield, (long)-nblks);
/*
* Account for change in delayed indirect blocks.
* Nothing to do for disk quota accounting here.
*/
ASSERT(da_old >= da_new);
if (da_old > da_new) {
xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
(int64_t)(da_old - da_new), 0);
}
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 bno, /* starting offset to unmap */
xfs_filblks_t len, /* length to unmap in file */
int flags, /* misc flags */
xfs_extnum_t nexts, /* number of extents max */
xfs_fsblock_t *firstblock, /* first allocated block
controls a.g. for allocs */
xfs_bmap_free_t *flist, /* i/o: list extents to free */
int *done) /* set if not done yet */
{
xfs_btree_cur_t *cur; /* bmap btree cursor */
xfs_bmbt_irec_t del; /* extent being deleted */
int eof; /* is deleting at eof */
xfs_bmbt_rec_host_t *ep; /* extent record pointer */
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 */
xfs_extnum_t lastx; /* last extent index used */
int logflags; /* transaction logging flags */
xfs_extlen_t mod; /* rt extent offset */
xfs_mount_t *mp; /* mount structure */
xfs_extnum_t nextents; /* number of file extents */
xfs_bmbt_irec_t prev; /* previous extent record */
xfs_fileoff_t start; /* first file offset deleted */
int tmp_logflags; /* partial logging flags */
int wasdel; /* was a delayed alloc extent */
int whichfork; /* data or attribute fork */
xfs_fsblock_t sum;
trace_xfs_bunmap(ip, bno, len, flags, _RET_IP_);
whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
XFS_ATTR_FORK : XFS_DATA_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 XFS_ERROR(EFSCORRUPTED);
}
mp = ip->i_mount;
if (XFS_FORCED_SHUTDOWN(mp))
return XFS_ERROR(EIO);
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ASSERT(len > 0);
ASSERT(nexts >= 0);
if (!(ifp->if_flags & XFS_IFEXTENTS) &&
(error = xfs_iread_extents(tp, ip, whichfork)))
return error;
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
if (nextents == 0) {
*done = 1;
return 0;
}
XFS_STATS_INC(xs_blk_unmap);
isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
start = bno;
bno = start + len - 1;
ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
&prev);
/*
* Check to see if the given block number is past the end of the
* file, back up to the last block if so...
*/
if (eof) {
ep = xfs_iext_get_ext(ifp, --lastx);
xfs_bmbt_get_all(ep, &got);
bno = got.br_startoff + got.br_blockcount - 1;
}
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.flist = flist;
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_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
}
extno = 0;
while (bno != (xfs_fileoff_t)-1 && bno >= start && lastx >= 0 &&
(nexts == 0 || extno < nexts)) {
/*
* Is the found extent after a hole in which bno lives?
* Just back up to the previous extent, if so.
*/
if (got.br_startoff > bno) {
if (--lastx < 0)
break;
ep = xfs_iext_get_ext(ifp, lastx);
xfs_bmbt_get_all(ep, &got);
}
/*
* Is the last block of this extent before the range
* we're supposed to delete? If so, we're done.
*/
bno = XFS_FILEOFF_MIN(bno,
got.br_startoff + got.br_blockcount - 1);
if (bno < start)
break;
/*
* Then deal with the (possibly delayed) allocated space
* we found.
*/
ASSERT(ep != NULL);
del = got;
wasdel = isnullstartblock(del.br_startblock);
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 > bno + 1)
del.br_blockcount = bno + 1 - del.br_startoff;
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(bno >= mod);
bno -= mod > del.br_blockcount ?
del.br_blockcount : mod;
if (bno < got.br_startoff) {
if (--lastx >= 0)
xfs_bmbt_get_all(xfs_iext_get_ext(
ifp, lastx), &got);
}
continue;
}
/*
* It's written, turn it unwritten.
* This is better than zeroing it.
*/
ASSERT(del.br_state == XFS_EXT_NORM);
ASSERT(xfs_trans_get_block_res(tp) > 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,
&lastx, &cur, &del, firstblock, flist,
&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 ||
xfs_trans_get_block_res(tp) == 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(bno >= del.br_blockcount);
bno -= del.br_blockcount;
if (got.br_startoff > bno) {
if (--lastx >= 0) {
ep = xfs_iext_get_ext(ifp,
lastx);
xfs_bmbt_get_all(ep, &got);
}
}
continue;
} else if (del.br_state == XFS_EXT_UNWRITTEN) {
/*
* This one is already unwritten.
* It must have a written left neighbor.
* Unwrite the killed part of that one and
* try again.
*/
ASSERT(lastx > 0);
xfs_bmbt_get_all(xfs_iext_get_ext(ifp,
lastx - 1), &prev);
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;
lastx--;
error = xfs_bmap_add_extent_unwritten_real(tp,
ip, &lastx, &cur, &prev,
firstblock, flist, &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, &lastx, &cur, &del,
firstblock, flist, &logflags);
if (error)
goto error0;
goto nodelete;
}
}
if (wasdel) {
ASSERT(startblockval(del.br_startblock) > 0);
/* Update realtime/data freespace, unreserve quota */
if (isrt) {
xfs_filblks_t rtexts;
rtexts = XFS_FSB_TO_B(mp, del.br_blockcount);
do_div(rtexts, mp->m_sb.sb_rextsize);
xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS,
(int64_t)rtexts, 0);
(void)xfs_trans_reserve_quota_nblks(NULL,
ip, -((long)del.br_blockcount), 0,
XFS_QMOPT_RES_RTBLKS);
} else {
xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
(int64_t)del.br_blockcount, 0);
(void)xfs_trans_reserve_quota_nblks(NULL,
ip, -((long)del.br_blockcount), 0,
XFS_QMOPT_RES_REGBLKS);
}
ip->i_delayed_blks -= del.br_blockcount;
if (cur)
cur->bc_private.b.flags |=
XFS_BTCUR_BPRV_WASDEL;
} else if (cur)
cur->bc_private.b.flags &= ~XFS_BTCUR_BPRV_WASDEL;
/*
* 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.
*/
if (!wasdel && xfs_trans_get_block_res(tp) == 0 &&
XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_NEXTENTS(ip, whichfork) >= /* Note the >= */
XFS_IFORK_MAXEXT(ip, whichfork) &&
del.br_startoff > got.br_startoff &&
del.br_startoff + del.br_blockcount <
got.br_startoff + got.br_blockcount) {
error = XFS_ERROR(ENOSPC);
goto error0;
}
error = xfs_bmap_del_extent(ip, tp, &lastx, flist, cur, &del,
&tmp_logflags, whichfork);
logflags |= tmp_logflags;
if (error)
goto error0;
bno = del.br_startoff - 1;
nodelete:
/*
* If not done go on to the next (previous) record.
*/
if (bno != (xfs_fileoff_t)-1 && bno >= start) {
if (lastx >= 0) {
ep = xfs_iext_get_ext(ifp, lastx);
if (xfs_bmbt_get_startoff(ep) > bno) {
if (--lastx >= 0)
ep = xfs_iext_get_ext(ifp,
lastx);
}
xfs_bmbt_get_all(ep, &got);
}
extno++;
}
}
*done = bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0;
/*
* 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, flist,
&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;
}
/*
* Shift extent records to the left to cover a hole.
*
* The maximum number of extents to be shifted in a single operation
* is @num_exts, and @current_ext keeps track of the current extent
* index we have shifted. @offset_shift_fsb is the length by which each
* extent is shifted. If there is no hole to shift the extents
* into, this will be considered invalid operation and we abort immediately.
*/
int
xfs_bmap_shift_extents(
struct xfs_trans *tp,
struct xfs_inode *ip,
int *done,
xfs_fileoff_t start_fsb,
xfs_fileoff_t offset_shift_fsb,
xfs_extnum_t *current_ext,
xfs_fsblock_t *firstblock,
struct xfs_bmap_free *flist,
int num_exts)
{
struct xfs_btree_cur *cur;
struct xfs_bmbt_rec_host *gotp;
struct xfs_bmbt_irec got;
struct xfs_bmbt_irec left;
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp;
xfs_extnum_t nexts = 0;
xfs_fileoff_t startoff;
int error = 0;
int i;
int whichfork = XFS_DATA_FORK;
int logflags;
xfs_filblks_t blockcount = 0;
int total_extents;
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_RANDOM_BMAPIFORMAT))) {
XFS_ERROR_REPORT("xfs_bmap_shift_extents",
XFS_ERRLEVEL_LOW, mp);
return XFS_ERROR(EFSCORRUPTED);
}
if (XFS_FORCED_SHUTDOWN(mp))
return XFS_ERROR(EIO);
ASSERT(current_ext != NULL);
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 *current_ext is 0, we would need to lookup the extent
* from where we would start shifting and store it in gotp.
*/
if (!*current_ext) {
gotp = xfs_iext_bno_to_ext(ifp, start_fsb, current_ext);
/*
* gotp can be null in 2 cases: 1) if there are no extents
* or 2) start_fsb lies in a hole beyond which there are
* no extents. Either way, we are done.
*/
if (!gotp) {
*done = 1;
return 0;
}
}
/* We are going to change core inode */
logflags = XFS_ILOG_CORE;
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.flist = flist;
cur->bc_private.b.flags = 0;
} else {
cur = NULL;
logflags |= XFS_ILOG_DEXT;
}
/*
* There may be delalloc extents in the data fork before the range we
* are collapsing out, so we cannot
* use the count of real extents here. Instead we have to calculate it
* from the incore fork.
*/
total_extents = ifp->if_bytes / sizeof(xfs_bmbt_rec_t);
while (nexts++ < num_exts && *current_ext < total_extents) {
gotp = xfs_iext_get_ext(ifp, *current_ext);
xfs_bmbt_get_all(gotp, &got);
startoff = got.br_startoff - offset_shift_fsb;
/*
* Before shifting extent into hole, make sure that the hole
* is large enough to accomodate the shift.
*/
if (*current_ext) {
xfs_bmbt_get_all(xfs_iext_get_ext(ifp,
*current_ext - 1), &left);
if (startoff < left.br_startoff + left.br_blockcount)
error = XFS_ERROR(EINVAL);
} else if (offset_shift_fsb > got.br_startoff) {
/*
* When first extent is shifted, offset_shift_fsb
* should be less than the stating offset of
* the first extent.
*/
error = XFS_ERROR(EINVAL);
}
if (error)
goto del_cursor;
if (cur) {
error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
got.br_startblock,
got.br_blockcount,
&i);
if (error)
goto del_cursor;
XFS_WANT_CORRUPTED_GOTO(i == 1, del_cursor);
}
/* Check if we can merge 2 adjacent extents */
if (*current_ext &&
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) {
blockcount = left.br_blockcount +
got.br_blockcount;
xfs_iext_remove(ip, *current_ext, 1, 0);
if (cur) {
error = xfs_btree_delete(cur, &i);
if (error)
goto del_cursor;
XFS_WANT_CORRUPTED_GOTO(i == 1, del_cursor);
}
XFS_IFORK_NEXT_SET(ip, whichfork,
XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
gotp = xfs_iext_get_ext(ifp, --*current_ext);
xfs_bmbt_get_all(gotp, &got);
/* Make cursor point to the extent we will update */
if (cur) {
error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
got.br_startblock,
got.br_blockcount,
&i);
if (error)
goto del_cursor;
XFS_WANT_CORRUPTED_GOTO(i == 1, del_cursor);
}
xfs_bmbt_set_blockcount(gotp, blockcount);
got.br_blockcount = blockcount;
} else {
/* We have to update the startoff */
xfs_bmbt_set_startoff(gotp, startoff);
got.br_startoff = startoff;
}
if (cur) {
error = xfs_bmbt_update(cur, got.br_startoff,
got.br_startblock,
got.br_blockcount,
got.br_state);
if (error)
goto del_cursor;
}
(*current_ext)++;
total_extents = ifp->if_bytes / sizeof(xfs_bmbt_rec_t);
}
/* Check if we are done */
if (*current_ext == total_extents)
*done = 1;
del_cursor:
if (cur)
xfs_btree_del_cursor(cur,
error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
xfs_trans_log_inode(tp, ip, logflags);
return error;
}
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