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authorDarrick J. Wong <darrick.wong@oracle.com>2017-06-19 18:58:56 +0300
committerDarrick J. Wong <darrick.wong@oracle.com>2017-06-20 00:11:34 +0300
commit378f681c4b588c0432236e5517bf47b7e54ff2dc (patch)
tree7d5ab6268ac52f10a6085c3a1edaaea83d83f30b /fs/xfs/xfs_icache.c
parente936945ee49693f40217db82a7db55c94e34ce4c (diff)
downloadlinux-378f681c4b588c0432236e5517bf47b7e54ff2dc.tar.xz
xfs: check if an inode is cached and allocated
Check the inode cache for a particular inode number. If it's in the cache, check that it's not currently being reclaimed. If it's not being reclaimed, return zero if the inode is allocated. This function will be used by various scrubbers to decide if the cache is more up to date than the disk in terms of checking if an inode is allocated. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
Diffstat (limited to 'fs/xfs/xfs_icache.c')
-rw-r--r--fs/xfs/xfs_icache.c52
1 files changed, 50 insertions, 2 deletions
diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index 990210fcb9c3..d78c853265d4 100644
--- a/fs/xfs/xfs_icache.c
+++ b/fs/xfs/xfs_icache.c
@@ -368,6 +368,11 @@ xfs_iget_cache_hit(
if (ip->i_flags & XFS_IRECLAIMABLE) {
trace_xfs_iget_reclaim(ip);
+ if (flags & XFS_IGET_INCORE) {
+ error = -EAGAIN;
+ goto out_error;
+ }
+
/*
* We need to set XFS_IRECLAIM to prevent xfs_reclaim_inode
* from stomping over us while we recycle the inode. We can't
@@ -432,7 +437,8 @@ xfs_iget_cache_hit(
if (lock_flags != 0)
xfs_ilock(ip, lock_flags);
- xfs_iflags_clear(ip, XFS_ISTALE | XFS_IDONTCACHE);
+ if (!(flags & XFS_IGET_INCORE))
+ xfs_iflags_clear(ip, XFS_ISTALE | XFS_IDONTCACHE);
XFS_STATS_INC(mp, xs_ig_found);
return 0;
@@ -603,6 +609,10 @@ again:
goto out_error_or_again;
} else {
rcu_read_unlock();
+ if (flags & XFS_IGET_INCORE) {
+ error = -ENOENT;
+ goto out_error_or_again;
+ }
XFS_STATS_INC(mp, xs_ig_missed);
error = xfs_iget_cache_miss(mp, pag, tp, ino, &ip,
@@ -623,7 +633,7 @@ again:
return 0;
out_error_or_again:
- if (error == -EAGAIN) {
+ if (!(flags & XFS_IGET_INCORE) && error == -EAGAIN) {
delay(1);
goto again;
}
@@ -632,6 +642,44 @@ out_error_or_again:
}
/*
+ * "Is this a cached inode that's also allocated?"
+ *
+ * Look up an inode by number in the given file system. If the inode is
+ * in cache and isn't in purgatory, return 1 if the inode is allocated
+ * and 0 if it is not. For all other cases (not in cache, being torn
+ * down, etc.), return a negative error code.
+ *
+ * The caller has to prevent inode allocation and freeing activity,
+ * presumably by locking the AGI buffer. This is to ensure that an
+ * inode cannot transition from allocated to freed until the caller is
+ * ready to allow that. If the inode is in an intermediate state (new,
+ * reclaimable, or being reclaimed), -EAGAIN will be returned; if the
+ * inode is not in the cache, -ENOENT will be returned. The caller must
+ * deal with these scenarios appropriately.
+ *
+ * This is a specialized use case for the online scrubber; if you're
+ * reading this, you probably want xfs_iget.
+ */
+int
+xfs_icache_inode_is_allocated(
+ struct xfs_mount *mp,
+ struct xfs_trans *tp,
+ xfs_ino_t ino,
+ bool *inuse)
+{
+ struct xfs_inode *ip;
+ int error;
+
+ error = xfs_iget(mp, tp, ino, XFS_IGET_INCORE, 0, &ip);
+ if (error)
+ return error;
+
+ *inuse = !!(VFS_I(ip)->i_mode);
+ IRELE(ip);
+ return 0;
+}
+
+/*
* The inode lookup is done in batches to keep the amount of lock traffic and
* radix tree lookups to a minimum. The batch size is a trade off between
* lookup reduction and stack usage. This is in the reclaim path, so we can't