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xfs: restore old agirotor behavior 

Prior to the removal of xfs_ialloc_next_ag, we would increment the agi
rotor and return the *old* value.  atomic_inc_return returns the new
value, which causes mkfs to allocate the root directory in AG 1.  Put
back the old behavior (at least for mkfs) by subtracting 1 here.

Fixes: 20a5eab49d ("xfs: convert xfs_ialloc_next_ag() to an atomic")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2023-02-17 15:44:25 -08:00
parent 60b730a40c
commit 6e2985c938
1 changed files with 2 additions and 1 deletions
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3
fs/xfs/libxfs/xfs_ialloc.c
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@ -1729,7 +1729,8 @@ xfs_dialloc(
* an AG has enough space for file creation.
*/
if (S_ISDIR(mode))
start_agno = atomic_inc_return(&mp->m_agirotor) % mp->m_maxagi;
start_agno = (atomic_inc_return(&mp->m_agirotor) - 1) %
mp->m_maxagi;
else {
start_agno = XFS_INO_TO_AGNO(mp, parent);
if (start_agno >= mp->m_maxagi)