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xfs: separate primary inode selection criteria in xfs_iget_cache_hit 

During review of the v6 deferred inode inactivation patchset[1], Dave
commented that _cache_hit should have a clear separation between inode
selection criteria and actions performed on a selected inode.  Move a
hunk to make this true, and compact the shrink cases in the function.

[1] https://lore.kernel.org/linux-xfs/162310469340.3465262.504398465311182657.stgit@locust/T/#mca6d958521cb88bbc1bfe1a30767203328d410b5
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong 2021-06-18 11:57:06 -07:00
parent ff7bebeb91
commit 77b4d2861e
1 changed files with 16 additions and 23 deletions
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39
fs/xfs/xfs_icache.c
View File

@ -507,13 +507,8 @@ xfs_iget_cache_hit(
* will not match, so check for that, too. * will not match, so check for that, too.
*/ */
spin_lock(&ip->i_flags_lock); spin_lock(&ip->i_flags_lock);
if (ip->i_ino != ino) { if (ip->i_ino != ino)
trace_xfs_iget_skip(ip); goto out_skip;
XFS_STATS_INC(mp, xs_ig_frecycle);
error = -EAGAIN;
goto out_error;
}
/* /*
* If we are racing with another cache hit that is currently * If we are racing with another cache hit that is currently
@ -525,12 +520,8 @@ xfs_iget_cache_hit(
* wait_on_inode to wait for these flags to be cleared * wait_on_inode to wait for these flags to be cleared
* instead of polling for it. * instead of polling for it.
*/ */
if (ip->i_flags & (XFS_INEW|XFS_IRECLAIM)) { if (ip->i_flags & (XFS_INEW | XFS_IRECLAIM))
trace_xfs_iget_skip(ip); goto out_skip;
XFS_STATS_INC(mp, xs_ig_frecycle);
error = -EAGAIN;
goto out_error;
}
/* /*
* Check the inode free state is valid. This also detects lookup * Check the inode free state is valid. This also detects lookup
@ -540,23 +531,21 @@ xfs_iget_cache_hit(
if (error) if (error)
goto out_error; goto out_error;
if (ip->i_flags & XFS_IRECLAIMABLE) { /* Skip inodes that have no vfs state. */
if (flags & XFS_IGET_INCORE) { if ((flags & XFS_IGET_INCORE) &&
error = -EAGAIN; (ip->i_flags & XFS_IRECLAIMABLE))
goto out_error; goto out_skip;
}
/* The inode fits the selection criteria; process it. */
if (ip->i_flags & XFS_IRECLAIMABLE) {
/* Drops i_flags_lock and RCU read lock. */ /* Drops i_flags_lock and RCU read lock. */
error = xfs_iget_recycle(pag, ip); error = xfs_iget_recycle(pag, ip);
if (error) if (error)
return error; return error;
} else { } else {
/* If the VFS inode is being torn down, pause and try again. */ /* If the VFS inode is being torn down, pause and try again. */
if (!igrab(inode)) { if (!igrab(inode))
trace_xfs_iget_skip(ip); goto out_skip;
error = -EAGAIN;
goto out_error;
}
/* We've got a live one. */ /* We've got a live one. */
spin_unlock(&ip->i_flags_lock); spin_unlock(&ip->i_flags_lock);
@ -573,6 +562,10 @@ xfs_iget_cache_hit(
return 0; return 0;
out_skip:
trace_xfs_iget_skip(ip);
XFS_STATS_INC(mp, xs_ig_frecycle);
error = -EAGAIN;
out_error: out_error:
spin_unlock(&ip->i_flags_lock); spin_unlock(&ip->i_flags_lock);
rcu_read_unlock(); rcu_read_unlock();