Commit bd7ade3c authored by Nikolay Borisov's avatar Nikolay Borisov Committed by Theodore Ts'o

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: default avatarNikolay Borisov <kernel@kyup.com>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
parent 0f0ff9a9
...@@ -317,6 +317,13 @@ sb_getblk(struct super_block *sb, sector_t block) ...@@ -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); 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 * static inline struct buffer_head *
sb_find_get_block(struct super_block *sb, sector_t block) sb_find_get_block(struct super_block *sb, sector_t block)
{ {
......
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