diff options
| author | Byoungyoung Lee <blee@gatech.edu> | 2015-03-25 14:57:53 +1100 |
|---|---|---|
| committer | Dave Chinner <david@fromorbit.com> | 2015-03-25 14:57:53 +1100 |
| commit | 20dafeefac97d1a690b113f2a954dc84fdf8f290 (patch) | |
| tree | 826d1ee45edb8545a27af8bc1f4f494665b1c534 | |
| parent | 65dd297ac25565701fead5e4ee69b9ca62729f0e (diff) | |
| download | lwn-20dafeefac97d1a690b113f2a954dc84fdf8f290.tar.gz lwn-20dafeefac97d1a690b113f2a954dc84fdf8f290.zip | |
xfs: xfs_mru_cache_insert() should use GFP_NOFS
xfs_mru_cache_insert() can be called from within transaction context
during block allocation like so:
write(2)
....
xfs_get_blocks
xfs_iomap_write_direct
start transaction
xfs_bmapi_write
xfs_bmapi_allocate
xfs_bmap_btalloc
xfs_bmap_btalloc_filestreams
xfs_filestream_new_ag
xfs_filestream_pick_ag
xfs_mru_cache_insert
radix_tree_preload(GFP_KERNEL)
In this case, GFP_KERNEL is incorrect and can potentially lead to
deadlocks in memory reclaim. It should use GFP_NOFS allocations to
avoid lock recursion problems.
[dchinner: rewrote commit message]
Signed-off-by: Byoungyoung Lee <blee@gatech.edu>
Signed-off-by: Sanidhya Kashyap <sanidhya.gatech@gmail.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
| -rw-r--r-- | fs/xfs/xfs_mru_cache.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/xfs/xfs_mru_cache.c b/fs/xfs/xfs_mru_cache.c index 30ecca3037e3..f8a674d7f092 100644 --- a/fs/xfs/xfs_mru_cache.c +++ b/fs/xfs/xfs_mru_cache.c @@ -437,7 +437,7 @@ xfs_mru_cache_insert( if (!mru || !mru->lists) return -EINVAL; - if (radix_tree_preload(GFP_KERNEL)) + if (radix_tree_preload(GFP_NOFS)) return -ENOMEM; INIT_LIST_HEAD(&elem->list_node); |