diff options
| author | Peter Watkins <treestem@gmail.com> | 2012-05-07 16:11:37 -0400 |
|---|---|---|
| committer | Ben Myers <bpm@sgi.com> | 2012-05-21 10:45:44 -0500 |
| commit | 3ba316037470bbf98c8a16c2179c02794fb8862e (patch) | |
| tree | cd9a68a6f7ecefc76e7e66e21fd936a60a1e2b6f | |
| parent | ea562ed6e7df5acd9392d993882c39e855099165 (diff) | |
| download | linux-3ba316037470bbf98c8a16c2179c02794fb8862e.tar.bz2 | |
xfs: fix memory reclaim deadlock on agi buffer
Note xfs_iget can be called while holding a locked agi buffer. If
it goes into memory reclaim then inode teardown may try to lock the
same buffer. Prevent the deadlock by calling radix_tree_preload
with GFP_NOFS.
Signed-off-by: Peter Watkins <treestem@gmail.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
| -rw-r--r-- | fs/xfs/xfs_iget.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/xfs/xfs_iget.c b/fs/xfs/xfs_iget.c index 7f81397eeec2..1bb4365e8c25 100644 --- a/fs/xfs/xfs_iget.c +++ b/fs/xfs/xfs_iget.c @@ -317,9 +317,10 @@ xfs_iget_cache_miss( /* * Preload the radix tree so we can insert safely under the * write spinlock. Note that we cannot sleep inside the preload - * region. + * region. Since we can be called from transaction context, don't + * recurse into the file system. */ - if (radix_tree_preload(GFP_KERNEL)) { + if (radix_tree_preload(GFP_NOFS)) { error = EAGAIN; goto out_destroy; } |