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authorNikolay Borisov <kernel@kyup.com>2015-07-02 01:34:07 -0400
committerBen Hutchings <ben@decadent.org.uk>2015-08-12 16:33:19 +0200
commitd612a04deae8a70636a2fced4fdd0bb94dfb6219 (patch)
tree82212766ebf7863e37c8ebd555400c06ab81bb55 /fs
parent786d7b3d2d1096c893e0fda85126c3972c98b027 (diff)
ext4: avoid deadlocks in the writeback path by using sb_getblk_gfp
commit c45653c341f5c8a0ce19c8f0ad4678640849cb86 upstream. Switch ext4 to using sb_getblk_gfp with GFP_NOFS added to fix possible deadlocks in the page writeback path. Signed-off-by: Nikolay Borisov <kernel@kyup.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> [bwh: Backported to 3.2: adjust context] Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'fs')
-rw-r--r--fs/ext4/extents.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 2da63ab7c416..e3d65abb41b3 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -700,7 +700,8 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
path[ppos].p_depth = i;
path[ppos].p_ext = NULL;
- bh = sb_getblk(inode->i_sb, path[ppos].p_block);
+ bh = sb_getblk_gfp(inode->i_sb, path[ppos].p_block,
+ __GFP_MOVABLE | GFP_NOFS);
if (unlikely(!bh)) {
ret = -ENOMEM;
goto err;
@@ -905,7 +906,7 @@ static int ext4_ext_split(handle_t *handle, struct inode *inode,
err = -EIO;
goto cleanup;
}
- bh = sb_getblk(inode->i_sb, newblock);
+ bh = sb_getblk_gfp(inode->i_sb, newblock, __GFP_MOVABLE | GFP_NOFS);
if (!bh) {
err = -ENOMEM;
goto cleanup;
@@ -1089,7 +1090,7 @@ static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
if (newblock == 0)
return err;
- bh = sb_getblk(inode->i_sb, newblock);
+ bh = sb_getblk_gfp(inode->i_sb, newblock, __GFP_MOVABLE | GFP_NOFS);
if (!bh)
return -ENOMEM;
lock_buffer(bh);