block: disallow FS recursion from sb_issue_discard allocation
Filesystems can call sb_issue_discard on a memory reclaim path (e.g. ext4 calls sb_issue_discard during journal commit). Use GFP_NOFS in sb_issue_discard to avoid recursing back into the FS. Reported-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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@ -933,7 +933,7 @@ static inline int sb_issue_discard(struct super_block *sb,
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{
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block <<= (sb->s_blocksize_bits - 9);
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nr_blocks <<= (sb->s_blocksize_bits - 9);
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return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_KERNEL,
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return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_NOFS,
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BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER);
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}
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