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xfs: introduce xfs_dialloc_roll() 

Introduce a helper to make the on-disk inode allocation rolling
logic clearer in preparation of the following cleanup.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Dave Chinner 2020-12-09 10:02:17 -08:00 committed by Darrick J. Wong
parent 15574ebbff
commit aececc9f8d
3 changed files with 41 additions and 30 deletions
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35
fs/xfs/libxfs/xfs_ialloc.c
View File

@ -1682,6 +1682,41 @@ xfs_dialloc_ag(
return error; return error;
} }
int
xfs_dialloc_roll(
struct xfs_trans **tpp,
struct xfs_buf *agibp)
{
struct xfs_trans *tp = *tpp;
struct xfs_dquot_acct *dqinfo;
int error;
/*
* Hold to on to the agibp across the commit so no other allocation can
* come in and take the free inodes we just allocated for our caller.
*/
xfs_trans_bhold(tp, agibp);
/*
* We want the quota changes to be associated with the next transaction,
* NOT this one. So, detach the dqinfo from this and attach it to the
* next transaction.
*/
dqinfo = tp->t_dqinfo;
tp->t_dqinfo = NULL;
error = xfs_trans_roll(&tp);
/* Re-attach the quota info that we detached from prev trx. */
tp->t_dqinfo = dqinfo;
*tpp = tp;
if (error)
return error;
xfs_trans_bjoin(tp, agibp);
return 0;
}
/* /*
* Allocate an inode on disk. * Allocate an inode on disk.
* *

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

@ -32,6 +32,11 @@ xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o)
return xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog); return xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog);
} }
int
xfs_dialloc_roll(
struct xfs_trans **tpp,
struct xfs_buf *agibp);
/* /*
* Allocate an inode on disk. * Allocate an inode on disk.
* Mode is used to tell whether the new inode will need space, and whether * Mode is used to tell whether the new inode will need space, and whether

31
fs/xfs/xfs_inode.c
View File

@ -958,7 +958,6 @@ xfs_dir_ialloc(
xfs_inode_t *ip; xfs_inode_t *ip;
xfs_buf_t *ialloc_context = NULL; xfs_buf_t *ialloc_context = NULL;
int code; int code;
void *dqinfo;
tp = *tpp; tp = *tpp;
ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
@ -1002,41 +1001,13 @@ xfs_dir_ialloc(
* to succeed the second time. * to succeed the second time.
*/ */
if (ialloc_context) { if (ialloc_context) {
/* code = xfs_dialloc_roll(&tp, ialloc_context);
* Normally, xfs_trans_commit releases all the locks.
* We call bhold to hang on to the ialloc_context across
* the commit. Holding this buffer prevents any other
* processes from doing any allocations in this
* allocation group.
*/
xfs_trans_bhold(tp, ialloc_context);
/*
* We want the quota changes to be associated with the next
* transaction, NOT this one. So, detach the dqinfo from this
* and attach it to the next transaction.
*/
dqinfo = NULL;
if (tp->t_dqinfo) {
dqinfo = (void *)tp->t_dqinfo;
tp->t_dqinfo = NULL;
}
code = xfs_trans_roll(&tp);
/*
* Re-attach the quota info that we detached from prev trx.
*/
if (dqinfo)
tp->t_dqinfo = dqinfo;
if (code) { if (code) {
xfs_buf_relse(ialloc_context); xfs_buf_relse(ialloc_context);
*tpp = tp; *tpp = tp;
*ipp = NULL; *ipp = NULL;
return code; return code;
} }
xfs_trans_bjoin(tp, ialloc_context);
/* /*
* Call ialloc again. Since we've locked out all * Call ialloc again. Since we've locked out all