linux/fs/xfs/xfs_trans_buf.c
Brian Foster a5814bceea xfs: disallow marking previously dirty buffers as ordered
Ordered buffers are used in situations where the buffer is not
physically logged but must pass through the transaction/logging
pipeline for a particular transaction. As a result, ordered buffers
are not unpinned and written back until the transaction commits to
the log. Ordered buffers have a strict requirement that the target
buffer must not be currently dirty and resident in the log pipeline
at the time it is marked ordered. If a dirty+ordered buffer is
committed, the buffer is reinserted to the AIL but not physically
relogged at the LSN of the associated checkpoint. The buffer log
item is assigned the LSN of the latest checkpoint and the AIL
effectively releases the previously logged buffer content from the
active log before the buffer has been written back. If the tail
pushes forward and a filesystem crash occurs while in this state, an
inconsistent filesystem could result.

It is currently the caller responsibility to ensure an ordered
buffer is not already dirty from a previous modification. This is
unclear and error prone when not used in situations where it is
guaranteed a buffer has not been previously modified (such as new
metadata allocations).

To facilitate general purpose use of ordered buffers, update
xfs_trans_ordered_buf() to conditionally order the buffer based on
state of the log item and return the status of the result. If the
bli is dirty, do not order the buffer and return false. The caller
must either physically log the buffer (having acquired the
appropriate log reservation) or push it from the AIL to clean it
before it can be marked ordered in the current transaction.

Note that ordered buffers are currently only used in two situations:
1.) inode chunk allocation where previously logged buffers are not
possible and 2.) extent swap which will be updated to handle ordered
buffer failures in a separate patch.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2017-09-01 10:55:30 -07:00

829 lines
23 KiB
C

/*
* Copyright (c) 2000-2002,2005 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_mount.h"
#include "xfs_inode.h"
#include "xfs_trans.h"
#include "xfs_buf_item.h"
#include "xfs_trans_priv.h"
#include "xfs_error.h"
#include "xfs_trace.h"
/*
* Check to see if a buffer matching the given parameters is already
* a part of the given transaction.
*/
STATIC struct xfs_buf *
xfs_trans_buf_item_match(
struct xfs_trans *tp,
struct xfs_buftarg *target,
struct xfs_buf_map *map,
int nmaps)
{
struct xfs_log_item_desc *lidp;
struct xfs_buf_log_item *blip;
int len = 0;
int i;
for (i = 0; i < nmaps; i++)
len += map[i].bm_len;
list_for_each_entry(lidp, &tp->t_items, lid_trans) {
blip = (struct xfs_buf_log_item *)lidp->lid_item;
if (blip->bli_item.li_type == XFS_LI_BUF &&
blip->bli_buf->b_target == target &&
XFS_BUF_ADDR(blip->bli_buf) == map[0].bm_bn &&
blip->bli_buf->b_length == len) {
ASSERT(blip->bli_buf->b_map_count == nmaps);
return blip->bli_buf;
}
}
return NULL;
}
/*
* Add the locked buffer to the transaction.
*
* The buffer must be locked, and it cannot be associated with any
* transaction.
*
* If the buffer does not yet have a buf log item associated with it,
* then allocate one for it. Then add the buf item to the transaction.
*/
STATIC void
_xfs_trans_bjoin(
struct xfs_trans *tp,
struct xfs_buf *bp,
int reset_recur)
{
struct xfs_buf_log_item *bip;
ASSERT(bp->b_transp == NULL);
/*
* The xfs_buf_log_item pointer is stored in b_fsprivate. If
* it doesn't have one yet, then allocate one and initialize it.
* The checks to see if one is there are in xfs_buf_item_init().
*/
xfs_buf_item_init(bp, tp->t_mountp);
bip = bp->b_fspriv;
ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_CANCEL));
ASSERT(!(bip->bli_flags & XFS_BLI_LOGGED));
if (reset_recur)
bip->bli_recur = 0;
/*
* Take a reference for this transaction on the buf item.
*/
atomic_inc(&bip->bli_refcount);
/*
* Get a log_item_desc to point at the new item.
*/
xfs_trans_add_item(tp, &bip->bli_item);
/*
* Initialize b_fsprivate2 so we can find it with incore_match()
* in xfs_trans_get_buf() and friends above.
*/
bp->b_transp = tp;
}
void
xfs_trans_bjoin(
struct xfs_trans *tp,
struct xfs_buf *bp)
{
_xfs_trans_bjoin(tp, bp, 0);
trace_xfs_trans_bjoin(bp->b_fspriv);
}
/*
* Get and lock the buffer for the caller if it is not already
* locked within the given transaction. If it is already locked
* within the transaction, just increment its lock recursion count
* and return a pointer to it.
*
* If the transaction pointer is NULL, make this just a normal
* get_buf() call.
*/
struct xfs_buf *
xfs_trans_get_buf_map(
struct xfs_trans *tp,
struct xfs_buftarg *target,
struct xfs_buf_map *map,
int nmaps,
xfs_buf_flags_t flags)
{
xfs_buf_t *bp;
xfs_buf_log_item_t *bip;
if (!tp)
return xfs_buf_get_map(target, map, nmaps, flags);
/*
* If we find the buffer in the cache with this transaction
* pointer in its b_fsprivate2 field, then we know we already
* have it locked. In this case we just increment the lock
* recursion count and return the buffer to the caller.
*/
bp = xfs_trans_buf_item_match(tp, target, map, nmaps);
if (bp != NULL) {
ASSERT(xfs_buf_islocked(bp));
if (XFS_FORCED_SHUTDOWN(tp->t_mountp)) {
xfs_buf_stale(bp);
bp->b_flags |= XBF_DONE;
}
ASSERT(bp->b_transp == tp);
bip = bp->b_fspriv;
ASSERT(bip != NULL);
ASSERT(atomic_read(&bip->bli_refcount) > 0);
bip->bli_recur++;
trace_xfs_trans_get_buf_recur(bip);
return bp;
}
bp = xfs_buf_get_map(target, map, nmaps, flags);
if (bp == NULL) {
return NULL;
}
ASSERT(!bp->b_error);
_xfs_trans_bjoin(tp, bp, 1);
trace_xfs_trans_get_buf(bp->b_fspriv);
return bp;
}
/*
* Get and lock the superblock buffer of this file system for the
* given transaction.
*
* We don't need to use incore_match() here, because the superblock
* buffer is a private buffer which we keep a pointer to in the
* mount structure.
*/
xfs_buf_t *
xfs_trans_getsb(xfs_trans_t *tp,
struct xfs_mount *mp,
int flags)
{
xfs_buf_t *bp;
xfs_buf_log_item_t *bip;
/*
* Default to just trying to lock the superblock buffer
* if tp is NULL.
*/
if (tp == NULL)
return xfs_getsb(mp, flags);
/*
* If the superblock buffer already has this transaction
* pointer in its b_fsprivate2 field, then we know we already
* have it locked. In this case we just increment the lock
* recursion count and return the buffer to the caller.
*/
bp = mp->m_sb_bp;
if (bp->b_transp == tp) {
bip = bp->b_fspriv;
ASSERT(bip != NULL);
ASSERT(atomic_read(&bip->bli_refcount) > 0);
bip->bli_recur++;
trace_xfs_trans_getsb_recur(bip);
return bp;
}
bp = xfs_getsb(mp, flags);
if (bp == NULL)
return NULL;
_xfs_trans_bjoin(tp, bp, 1);
trace_xfs_trans_getsb(bp->b_fspriv);
return bp;
}
/*
* Get and lock the buffer for the caller if it is not already
* locked within the given transaction. If it has not yet been
* read in, read it from disk. If it is already locked
* within the transaction and already read in, just increment its
* lock recursion count and return a pointer to it.
*
* If the transaction pointer is NULL, make this just a normal
* read_buf() call.
*/
int
xfs_trans_read_buf_map(
struct xfs_mount *mp,
struct xfs_trans *tp,
struct xfs_buftarg *target,
struct xfs_buf_map *map,
int nmaps,
xfs_buf_flags_t flags,
struct xfs_buf **bpp,
const struct xfs_buf_ops *ops)
{
struct xfs_buf *bp = NULL;
struct xfs_buf_log_item *bip;
int error;
*bpp = NULL;
/*
* If we find the buffer in the cache with this transaction
* pointer in its b_fsprivate2 field, then we know we already
* have it locked. If it is already read in we just increment
* the lock recursion count and return the buffer to the caller.
* If the buffer is not yet read in, then we read it in, increment
* the lock recursion count, and return it to the caller.
*/
if (tp)
bp = xfs_trans_buf_item_match(tp, target, map, nmaps);
if (bp) {
ASSERT(xfs_buf_islocked(bp));
ASSERT(bp->b_transp == tp);
ASSERT(bp->b_fspriv != NULL);
ASSERT(!bp->b_error);
ASSERT(bp->b_flags & XBF_DONE);
/*
* We never locked this buf ourselves, so we shouldn't
* brelse it either. Just get out.
*/
if (XFS_FORCED_SHUTDOWN(mp)) {
trace_xfs_trans_read_buf_shut(bp, _RET_IP_);
return -EIO;
}
bip = bp->b_fspriv;
bip->bli_recur++;
ASSERT(atomic_read(&bip->bli_refcount) > 0);
trace_xfs_trans_read_buf_recur(bip);
*bpp = bp;
return 0;
}
bp = xfs_buf_read_map(target, map, nmaps, flags, ops);
if (!bp) {
if (!(flags & XBF_TRYLOCK))
return -ENOMEM;
return tp ? 0 : -EAGAIN;
}
/*
* If we've had a read error, then the contents of the buffer are
* invalid and should not be used. To ensure that a followup read tries
* to pull the buffer from disk again, we clear the XBF_DONE flag and
* mark the buffer stale. This ensures that anyone who has a current
* reference to the buffer will interpret it's contents correctly and
* future cache lookups will also treat it as an empty, uninitialised
* buffer.
*/
if (bp->b_error) {
error = bp->b_error;
if (!XFS_FORCED_SHUTDOWN(mp))
xfs_buf_ioerror_alert(bp, __func__);
bp->b_flags &= ~XBF_DONE;
xfs_buf_stale(bp);
if (tp && (tp->t_flags & XFS_TRANS_DIRTY))
xfs_force_shutdown(tp->t_mountp, SHUTDOWN_META_IO_ERROR);
xfs_buf_relse(bp);
/* bad CRC means corrupted metadata */
if (error == -EFSBADCRC)
error = -EFSCORRUPTED;
return error;
}
if (XFS_FORCED_SHUTDOWN(mp)) {
xfs_buf_relse(bp);
trace_xfs_trans_read_buf_shut(bp, _RET_IP_);
return -EIO;
}
if (tp) {
_xfs_trans_bjoin(tp, bp, 1);
trace_xfs_trans_read_buf(bp->b_fspriv);
}
*bpp = bp;
return 0;
}
/*
* Release the buffer bp which was previously acquired with one of the
* xfs_trans_... buffer allocation routines if the buffer has not
* been modified within this transaction. If the buffer is modified
* within this transaction, do decrement the recursion count but do
* not release the buffer even if the count goes to 0. If the buffer is not
* modified within the transaction, decrement the recursion count and
* release the buffer if the recursion count goes to 0.
*
* If the buffer is to be released and it was not modified before
* this transaction began, then free the buf_log_item associated with it.
*
* If the transaction pointer is NULL, make this just a normal
* brelse() call.
*/
void
xfs_trans_brelse(xfs_trans_t *tp,
xfs_buf_t *bp)
{
xfs_buf_log_item_t *bip;
int freed;
/*
* Default to a normal brelse() call if the tp is NULL.
*/
if (tp == NULL) {
ASSERT(bp->b_transp == NULL);
xfs_buf_relse(bp);
return;
}
ASSERT(bp->b_transp == tp);
bip = bp->b_fspriv;
ASSERT(bip->bli_item.li_type == XFS_LI_BUF);
ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_CANCEL));
ASSERT(atomic_read(&bip->bli_refcount) > 0);
trace_xfs_trans_brelse(bip);
/*
* If the release is just for a recursive lock,
* then decrement the count and return.
*/
if (bip->bli_recur > 0) {
bip->bli_recur--;
return;
}
/*
* If the buffer is dirty within this transaction, we can't
* release it until we commit.
*/
if (bip->bli_item.li_desc->lid_flags & XFS_LID_DIRTY)
return;
/*
* If the buffer has been invalidated, then we can't release
* it until the transaction commits to disk unless it is re-dirtied
* as part of this transaction. This prevents us from pulling
* the item from the AIL before we should.
*/
if (bip->bli_flags & XFS_BLI_STALE)
return;
ASSERT(!(bip->bli_flags & XFS_BLI_LOGGED));
/*
* Free up the log item descriptor tracking the released item.
*/
xfs_trans_del_item(&bip->bli_item);
/*
* Clear the hold flag in the buf log item if it is set.
* We wouldn't want the next user of the buffer to
* get confused.
*/
if (bip->bli_flags & XFS_BLI_HOLD) {
bip->bli_flags &= ~XFS_BLI_HOLD;
}
/*
* Drop our reference to the buf log item.
*/
freed = atomic_dec_and_test(&bip->bli_refcount);
/*
* If the buf item is not tracking data in the log, then we must free it
* before releasing the buffer back to the free pool.
*
* If the fs has shutdown and we dropped the last reference, it may fall
* on us to release a (possibly dirty) bli if it never made it to the
* AIL (e.g., the aborted unpin already happened and didn't release it
* due to our reference). Since we're already shutdown and need xa_lock,
* just force remove from the AIL and release the bli here.
*/
if (XFS_FORCED_SHUTDOWN(tp->t_mountp) && freed) {
xfs_trans_ail_remove(&bip->bli_item, SHUTDOWN_LOG_IO_ERROR);
xfs_buf_item_relse(bp);
} else if (!(bip->bli_flags & XFS_BLI_DIRTY)) {
/***
ASSERT(bp->b_pincount == 0);
***/
ASSERT(atomic_read(&bip->bli_refcount) == 0);
ASSERT(!(bip->bli_item.li_flags & XFS_LI_IN_AIL));
ASSERT(!(bip->bli_flags & XFS_BLI_INODE_ALLOC_BUF));
xfs_buf_item_relse(bp);
}
bp->b_transp = NULL;
xfs_buf_relse(bp);
}
/*
* Mark the buffer as not needing to be unlocked when the buf item's
* iop_unlock() routine is called. The buffer must already be locked
* and associated with the given transaction.
*/
/* ARGSUSED */
void
xfs_trans_bhold(xfs_trans_t *tp,
xfs_buf_t *bp)
{
xfs_buf_log_item_t *bip = bp->b_fspriv;
ASSERT(bp->b_transp == tp);
ASSERT(bip != NULL);
ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_CANCEL));
ASSERT(atomic_read(&bip->bli_refcount) > 0);
bip->bli_flags |= XFS_BLI_HOLD;
trace_xfs_trans_bhold(bip);
}
/*
* Cancel the previous buffer hold request made on this buffer
* for this transaction.
*/
void
xfs_trans_bhold_release(xfs_trans_t *tp,
xfs_buf_t *bp)
{
xfs_buf_log_item_t *bip = bp->b_fspriv;
ASSERT(bp->b_transp == tp);
ASSERT(bip != NULL);
ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_CANCEL));
ASSERT(atomic_read(&bip->bli_refcount) > 0);
ASSERT(bip->bli_flags & XFS_BLI_HOLD);
bip->bli_flags &= ~XFS_BLI_HOLD;
trace_xfs_trans_bhold_release(bip);
}
/*
* Mark a buffer dirty in the transaction.
*/
void
xfs_trans_dirty_buf(
struct xfs_trans *tp,
struct xfs_buf *bp)
{
struct xfs_buf_log_item *bip = bp->b_fspriv;
ASSERT(bp->b_transp == tp);
ASSERT(bip != NULL);
ASSERT(bp->b_iodone == NULL ||
bp->b_iodone == xfs_buf_iodone_callbacks);
/*
* Mark the buffer as needing to be written out eventually,
* and set its iodone function to remove the buffer's buf log
* item from the AIL and free it when the buffer is flushed
* to disk. See xfs_buf_attach_iodone() for more details
* on li_cb and xfs_buf_iodone_callbacks().
* If we end up aborting this transaction, we trap this buffer
* inside the b_bdstrat callback so that this won't get written to
* disk.
*/
bp->b_flags |= XBF_DONE;
ASSERT(atomic_read(&bip->bli_refcount) > 0);
bp->b_iodone = xfs_buf_iodone_callbacks;
bip->bli_item.li_cb = xfs_buf_iodone;
/*
* If we invalidated the buffer within this transaction, then
* cancel the invalidation now that we're dirtying the buffer
* again. There are no races with the code in xfs_buf_item_unpin(),
* because we have a reference to the buffer this entire time.
*/
if (bip->bli_flags & XFS_BLI_STALE) {
bip->bli_flags &= ~XFS_BLI_STALE;
ASSERT(bp->b_flags & XBF_STALE);
bp->b_flags &= ~XBF_STALE;
bip->__bli_format.blf_flags &= ~XFS_BLF_CANCEL;
}
bip->bli_flags |= XFS_BLI_DIRTY | XFS_BLI_LOGGED;
tp->t_flags |= XFS_TRANS_DIRTY;
bip->bli_item.li_desc->lid_flags |= XFS_LID_DIRTY;
}
/*
* This is called to mark bytes first through last inclusive of the given
* buffer as needing to be logged when the transaction is committed.
* The buffer must already be associated with the given transaction.
*
* First and last are numbers relative to the beginning of this buffer,
* so the first byte in the buffer is numbered 0 regardless of the
* value of b_blkno.
*/
void
xfs_trans_log_buf(
struct xfs_trans *tp,
struct xfs_buf *bp,
uint first,
uint last)
{
struct xfs_buf_log_item *bip = bp->b_fspriv;
ASSERT(first <= last && last < BBTOB(bp->b_length));
ASSERT(!(bip->bli_flags & XFS_BLI_ORDERED));
xfs_trans_dirty_buf(tp, bp);
trace_xfs_trans_log_buf(bip);
xfs_buf_item_log(bip, first, last);
}
/*
* Invalidate a buffer that is being used within a transaction.
*
* Typically this is because the blocks in the buffer are being freed, so we
* need to prevent it from being written out when we're done. Allowing it
* to be written again might overwrite data in the free blocks if they are
* reallocated to a file.
*
* We prevent the buffer from being written out by marking it stale. We can't
* get rid of the buf log item at this point because the buffer may still be
* pinned by another transaction. If that is the case, then we'll wait until
* the buffer is committed to disk for the last time (we can tell by the ref
* count) and free it in xfs_buf_item_unpin(). Until that happens we will
* keep the buffer locked so that the buffer and buf log item are not reused.
*
* We also set the XFS_BLF_CANCEL flag in the buf log format structure and log
* the buf item. This will be used at recovery time to determine that copies
* of the buffer in the log before this should not be replayed.
*
* We mark the item descriptor and the transaction dirty so that we'll hold
* the buffer until after the commit.
*
* Since we're invalidating the buffer, we also clear the state about which
* parts of the buffer have been logged. We also clear the flag indicating
* that this is an inode buffer since the data in the buffer will no longer
* be valid.
*
* We set the stale bit in the buffer as well since we're getting rid of it.
*/
void
xfs_trans_binval(
xfs_trans_t *tp,
xfs_buf_t *bp)
{
xfs_buf_log_item_t *bip = bp->b_fspriv;
int i;
ASSERT(bp->b_transp == tp);
ASSERT(bip != NULL);
ASSERT(atomic_read(&bip->bli_refcount) > 0);
trace_xfs_trans_binval(bip);
if (bip->bli_flags & XFS_BLI_STALE) {
/*
* If the buffer is already invalidated, then
* just return.
*/
ASSERT(bp->b_flags & XBF_STALE);
ASSERT(!(bip->bli_flags & (XFS_BLI_LOGGED | XFS_BLI_DIRTY)));
ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_INODE_BUF));
ASSERT(!(bip->__bli_format.blf_flags & XFS_BLFT_MASK));
ASSERT(bip->__bli_format.blf_flags & XFS_BLF_CANCEL);
ASSERT(bip->bli_item.li_desc->lid_flags & XFS_LID_DIRTY);
ASSERT(tp->t_flags & XFS_TRANS_DIRTY);
return;
}
xfs_buf_stale(bp);
bip->bli_flags |= XFS_BLI_STALE;
bip->bli_flags &= ~(XFS_BLI_INODE_BUF | XFS_BLI_LOGGED | XFS_BLI_DIRTY);
bip->__bli_format.blf_flags &= ~XFS_BLF_INODE_BUF;
bip->__bli_format.blf_flags |= XFS_BLF_CANCEL;
bip->__bli_format.blf_flags &= ~XFS_BLFT_MASK;
for (i = 0; i < bip->bli_format_count; i++) {
memset(bip->bli_formats[i].blf_data_map, 0,
(bip->bli_formats[i].blf_map_size * sizeof(uint)));
}
bip->bli_item.li_desc->lid_flags |= XFS_LID_DIRTY;
tp->t_flags |= XFS_TRANS_DIRTY;
}
/*
* This call is used to indicate that the buffer contains on-disk inodes which
* must be handled specially during recovery. They require special handling
* because only the di_next_unlinked from the inodes in the buffer should be
* recovered. The rest of the data in the buffer is logged via the inodes
* themselves.
*
* All we do is set the XFS_BLI_INODE_BUF flag in the items flags so it can be
* transferred to the buffer's log format structure so that we'll know what to
* do at recovery time.
*/
void
xfs_trans_inode_buf(
xfs_trans_t *tp,
xfs_buf_t *bp)
{
xfs_buf_log_item_t *bip = bp->b_fspriv;
ASSERT(bp->b_transp == tp);
ASSERT(bip != NULL);
ASSERT(atomic_read(&bip->bli_refcount) > 0);
bip->bli_flags |= XFS_BLI_INODE_BUF;
xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DINO_BUF);
}
/*
* This call is used to indicate that the buffer is going to
* be staled and was an inode buffer. This means it gets
* special processing during unpin - where any inodes
* associated with the buffer should be removed from ail.
* There is also special processing during recovery,
* any replay of the inodes in the buffer needs to be
* prevented as the buffer may have been reused.
*/
void
xfs_trans_stale_inode_buf(
xfs_trans_t *tp,
xfs_buf_t *bp)
{
xfs_buf_log_item_t *bip = bp->b_fspriv;
ASSERT(bp->b_transp == tp);
ASSERT(bip != NULL);
ASSERT(atomic_read(&bip->bli_refcount) > 0);
bip->bli_flags |= XFS_BLI_STALE_INODE;
bip->bli_item.li_cb = xfs_buf_iodone;
xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DINO_BUF);
}
/*
* Mark the buffer as being one which contains newly allocated
* inodes. We need to make sure that even if this buffer is
* relogged as an 'inode buf' we still recover all of the inode
* images in the face of a crash. This works in coordination with
* xfs_buf_item_committed() to ensure that the buffer remains in the
* AIL at its original location even after it has been relogged.
*/
/* ARGSUSED */
void
xfs_trans_inode_alloc_buf(
xfs_trans_t *tp,
xfs_buf_t *bp)
{
xfs_buf_log_item_t *bip = bp->b_fspriv;
ASSERT(bp->b_transp == tp);
ASSERT(bip != NULL);
ASSERT(atomic_read(&bip->bli_refcount) > 0);
bip->bli_flags |= XFS_BLI_INODE_ALLOC_BUF;
xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DINO_BUF);
}
/*
* Mark the buffer as ordered for this transaction. This means that the contents
* of the buffer are not recorded in the transaction but it is tracked in the
* AIL as though it was. This allows us to record logical changes in
* transactions rather than the physical changes we make to the buffer without
* changing writeback ordering constraints of metadata buffers.
*/
bool
xfs_trans_ordered_buf(
struct xfs_trans *tp,
struct xfs_buf *bp)
{
struct xfs_buf_log_item *bip = bp->b_fspriv;
ASSERT(bp->b_transp == tp);
ASSERT(bip != NULL);
ASSERT(atomic_read(&bip->bli_refcount) > 0);
if (xfs_buf_item_dirty_format(bip))
return false;
bip->bli_flags |= XFS_BLI_ORDERED;
trace_xfs_buf_item_ordered(bip);
/*
* We don't log a dirty range of an ordered buffer but it still needs
* to be marked dirty and that it has been logged.
*/
xfs_trans_dirty_buf(tp, bp);
return true;
}
/*
* Set the type of the buffer for log recovery so that it can correctly identify
* and hence attach the correct buffer ops to the buffer after replay.
*/
void
xfs_trans_buf_set_type(
struct xfs_trans *tp,
struct xfs_buf *bp,
enum xfs_blft type)
{
struct xfs_buf_log_item *bip = bp->b_fspriv;
if (!tp)
return;
ASSERT(bp->b_transp == tp);
ASSERT(bip != NULL);
ASSERT(atomic_read(&bip->bli_refcount) > 0);
xfs_blft_to_flags(&bip->__bli_format, type);
}
void
xfs_trans_buf_copy_type(
struct xfs_buf *dst_bp,
struct xfs_buf *src_bp)
{
struct xfs_buf_log_item *sbip = src_bp->b_fspriv;
struct xfs_buf_log_item *dbip = dst_bp->b_fspriv;
enum xfs_blft type;
type = xfs_blft_from_flags(&sbip->__bli_format);
xfs_blft_to_flags(&dbip->__bli_format, type);
}
/*
* Similar to xfs_trans_inode_buf(), this marks the buffer as a cluster of
* dquots. However, unlike in inode buffer recovery, dquot buffers get
* recovered in their entirety. (Hence, no XFS_BLI_DQUOT_ALLOC_BUF flag).
* The only thing that makes dquot buffers different from regular
* buffers is that we must not replay dquot bufs when recovering
* if a _corresponding_ quotaoff has happened. We also have to distinguish
* between usr dquot bufs and grp dquot bufs, because usr and grp quotas
* can be turned off independently.
*/
/* ARGSUSED */
void
xfs_trans_dquot_buf(
xfs_trans_t *tp,
xfs_buf_t *bp,
uint type)
{
struct xfs_buf_log_item *bip = bp->b_fspriv;
ASSERT(type == XFS_BLF_UDQUOT_BUF ||
type == XFS_BLF_PDQUOT_BUF ||
type == XFS_BLF_GDQUOT_BUF);
bip->__bli_format.blf_flags |= type;
switch (type) {
case XFS_BLF_UDQUOT_BUF:
type = XFS_BLFT_UDQUOT_BUF;
break;
case XFS_BLF_PDQUOT_BUF:
type = XFS_BLFT_PDQUOT_BUF;
break;
case XFS_BLF_GDQUOT_BUF:
type = XFS_BLFT_GDQUOT_BUF;
break;
default:
type = XFS_BLFT_UNKNOWN_BUF;
break;
}
xfs_trans_buf_set_type(tp, bp, type);
}