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xfs: use generic percpu counters for free inode counter

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XFS has hand-rolled per-cpu counters for the superblock since before
there was any generic implementation. The free inode counter is not
used for any limit enforcement - the per-AG free inode counters are
used during allocation to determine if there are inode available for
allocation.

Hence we don't need any of the complexity of the hand-rolled
counters and we can simply replace them with generic per-cpu
counters similar to the inode counter.

This version introduces a xfs_mod_ifree() helper function from
Christoph Hellwig.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Dave Chinner 2015-02-23 21:19:53 +11:00 • committed by Dave Chinner
parent 501ab32387
commit e88b64ea1f
6 changed files with 42 additions and 48 deletions
Download patch file Download diff file Expand all files Collapse all files

5
fs/xfs/xfs_trans.c
View file

@ -560,8 +560,7 @@ xfs_trans_unreserve_and_mod_sb(
}
if (ifreedelta) {
error = xfs_icsb_modify_counters(mp, XFS_SBS_IFREE,
ifreedelta, rsvd);
error = xfs_mod_ifree(mp, ifreedelta);
if (error)
goto out_undo_icount;
}
@ -630,7 +629,7 @@ xfs_trans_unreserve_and_mod_sb(
out_undo_ifreecount:
if (ifreedelta)
xfs_icsb_modify_counters(mp, XFS_SBS_IFREE, -ifreedelta, rsvd);
xfs_mod_ifree(mp, -ifreedelta);
out_undo_icount:
if (idelta)
xfs_mod_icount(mp, -idelta);