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xfs: add the ability to join a held buffer to a defer_ops 

In certain cases, defer_ops callers will lock a buffer and want to hold
the lock across transaction rolls.  Similar to ijoined inodes, we want
to dirty & join the buffer with each transaction roll in defer_finish so
that afterwards the caller still owns the buffer lock and we haven't
inadvertently pinned the log.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2017-12-07 19:07:02 -08:00
parent b7e0b6ff54
commit b7b2846fe2
2 changed files with 40 additions and 4 deletions
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39
fs/xfs/libxfs/xfs_defer.c
View File

@ -249,6 +249,10 @@ xfs_defer_trans_roll(
for (i = 0; i < XFS_DEFER_OPS_NR_INODES && dop->dop_inodes[i]; i++)
xfs_trans_log_inode(*tp, dop->dop_inodes[i], XFS_ILOG_CORE);
/* Hold the (previously bjoin'd) buffer locked across the roll. */
for (i = 0; i < XFS_DEFER_OPS_NR_BUFS && dop->dop_bufs[i]; i++)
xfs_trans_dirty_buf(*tp, dop->dop_bufs[i]);
trace_xfs_defer_trans_roll((*tp)->t_mountp, dop);
/* Roll the transaction. */
@ -264,6 +268,12 @@ xfs_defer_trans_roll(
for (i = 0; i < XFS_DEFER_OPS_NR_INODES && dop->dop_inodes[i]; i++)
xfs_trans_ijoin(*tp, dop->dop_inodes[i], 0);
/* Rejoin the buffers and dirty them so the log moves forward. */
for (i = 0; i < XFS_DEFER_OPS_NR_BUFS && dop->dop_bufs[i]; i++) {
xfs_trans_bjoin(*tp, dop->dop_bufs[i]);
xfs_trans_bhold(*tp, dop->dop_bufs[i]);
}
return error;
}
@ -295,6 +305,31 @@ xfs_defer_ijoin(
}
}
ASSERT(0);
return -EFSCORRUPTED;
}
/*
* Add this buffer to the deferred op. Each joined buffer is relogged
* each time we roll the transaction.
*/
int
xfs_defer_bjoin(
struct xfs_defer_ops *dop,
struct xfs_buf *bp)
{
int i;
for (i = 0; i < XFS_DEFER_OPS_NR_BUFS; i++) {
if (dop->dop_bufs[i] == bp)
return 0;
else if (dop->dop_bufs[i] == NULL) {
dop->dop_bufs[i] = bp;
return 0;
}
}
ASSERT(0);
return -EFSCORRUPTED;
}
@ -493,9 +528,7 @@ xfs_defer_init(
struct xfs_defer_ops *dop,
xfs_fsblock_t *fbp)
{
dop->dop_committed = false;
dop->dop_low = false;
memset(&dop->dop_inodes, 0, sizeof(dop->dop_inodes));
memset(dop, 0, sizeof(struct xfs_defer_ops));
*fbp = NULLFSBLOCK;
INIT_LIST_HEAD(&dop->dop_intake);
INIT_LIST_HEAD(&dop->dop_pending);

5
fs/xfs/libxfs/xfs_defer.h
View File

@ -59,6 +59,7 @@ enum xfs_defer_ops_type {
};
#define XFS_DEFER_OPS_NR_INODES 2 /* join up to two inodes */
#define XFS_DEFER_OPS_NR_BUFS 2 /* join up to two buffers */
struct xfs_defer_ops {
bool dop_committed; /* did any trans commit? */
@ -66,8 +67,9 @@ struct xfs_defer_ops {
struct list_head dop_intake; /* unlogged pending work */
struct list_head dop_pending; /* logged pending work */
/* relog these inodes with each roll */
/* relog these with each roll */
struct xfs_inode *dop_inodes[XFS_DEFER_OPS_NR_INODES];
struct xfs_buf *dop_bufs[XFS_DEFER_OPS_NR_BUFS];
};
void xfs_defer_add(struct xfs_defer_ops *dop, enum xfs_defer_ops_type type,
@ -77,6 +79,7 @@ void xfs_defer_cancel(struct xfs_defer_ops *dop);
void xfs_defer_init(struct xfs_defer_ops *dop, xfs_fsblock_t *fbp);
bool xfs_defer_has_unfinished_work(struct xfs_defer_ops *dop);
int xfs_defer_ijoin(struct xfs_defer_ops *dop, struct xfs_inode *ip);
int xfs_defer_bjoin(struct xfs_defer_ops *dop, struct xfs_buf *bp);
/* Description of a deferred type. */
struct xfs_defer_op_type {