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xfs: inode allocation can use a single perag instance

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Now that we've internalised the two-phase inode allocation, we can
now easily make the AG selection and allocation atomic from the
perspective of a single perag context. This will ensure AGs going
offline/away cannot occur between the selection and allocation
steps.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Dave Chinner 2021-06-02 10:48:24 +10:00 committed by Dave Chinner
parent b652afd937
commit 309161f660
1 changed files with 3 additions and 3 deletions
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6
fs/xfs/libxfs/xfs_ialloc.c
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@ -1432,6 +1432,7 @@ static int
xfs_dialloc_ag(
struct xfs_trans *tp,
struct xfs_buf *agbp,
struct xfs_perag *pag,
xfs_ino_t parent,
xfs_ino_t *inop)
{
@ -1446,7 +1447,6 @@ xfs_dialloc_ag(
int error;
int offset;
int i;
struct xfs_perag *pag = agbp->b_pag;
if (!xfs_sb_version_hasfinobt(&mp->m_sb))
return xfs_dialloc_ag_inobt(tp, agbp, pag, parent, inop);
@ -1763,9 +1763,9 @@ nextag:
xfs_perag_put(pag);
return error ? error : -ENOSPC;
found_ag:
xfs_perag_put(pag);
/* Allocate an inode in the found AG */
error = xfs_dialloc_ag(*tpp, agbp, parent, &ino);
error = xfs_dialloc_ag(*tpp, agbp, pag, parent, &ino);
xfs_perag_put(pag);
if (error)
return error;
*new_ino = ino;