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bufferhead: Add _gfp version for sb_getblk() 

sb_getblk() is used during ext4 (and possibly other FSes) writeback
paths. Sometimes such path require allocating memory and guaranteeing
that such allocation won't block. Currently, however, there is no way
to provide user flags for sb_getblk which could lead to deadlocks.

This patch implements a sb_getblk_gfp with the only difference it can
accept user-provided GFP flags.

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 01:32:44 -04:00 committed by Theodore Ts'o
parent 0f0ff9a9f3
commit bd7ade3cd9
1 changed files with 7 additions and 0 deletions
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7
include/linux/buffer_head.h
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@ -317,6 +317,13 @@ sb_getblk(struct super_block *sb, sector_t block)
return __getblk_gfp(sb->s_bdev, block, sb->s_blocksize, __GFP_MOVABLE);
}
static inline struct buffer_head *
sb_getblk_gfp(struct super_block *sb, sector_t block, gfp_t gfp)
{
return __getblk_gfp(sb->s_bdev, block, sb->s_blocksize, gfp);
}
static inline struct buffer_head *
sb_find_get_block(struct super_block *sb, sector_t block)
{