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ext4: avoid deadlocks in the writeback path by using sb_getblk_gfp

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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>
Cc: stable@vger.kernel.org
This commit is contained in:
Nikolay Borisov 2015-07-02 01:34:07 -04:00 committed by Theodore Ts'o
parent bd7ade3cd9
commit c45653c341
1 changed files with 3 additions and 3 deletions
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6
fs/ext4/extents.c
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@ -503,7 +503,7 @@ __read_extent_tree_block(const char *function, unsigned int line,
struct buffer_head *bh;
int err;
bh = sb_getblk(inode->i_sb, pblk);
bh = sb_getblk_gfp(inode->i_sb, pblk, __GFP_MOVABLE | GFP_NOFS);
if (unlikely(!bh))
return ERR_PTR(-ENOMEM);
@ -1088,7 +1088,7 @@ 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 (unlikely(!bh)) {
err = -ENOMEM;
goto cleanup;
@ -1282,7 +1282,7 @@ 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 (unlikely(!bh))
return -ENOMEM;
lock_buffer(bh);