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Commit 62856a9b authored by Stefan Behrens's avatar Stefan Behrens Committed by Chris Mason
Browse files

Btrfs: detect corrupted filesystem after write I/O errors 



In check-integrity, detect when a superblock is written that points
to blocks that have not been written to disk due to I/O write errors.

Signed-off-by: default avatarStefan Behrens <sbehrens@giantdisaster.de>
parent bedb2cca

fs/btrfs/check-integrity.c

+14 −2
Original line number Diff line number Diff line
@@ -37,8 +37,9 @@ 
 *        the file system was mounted, (i.e., they have been

 *        referenced by the super block) or they have been

 *        written since then and the write completion callback

 *        was called and a FLUSH request to the device where

 *        these blocks are located was received and completed.

 *        was called and no write error was indicated and a

 *        FLUSH request to the device where these blocks are

 *        located was received and completed.

 *    2b. All referenced blocks need to have a generation

 *        number which is equal to the parent's number.

 *
@@ -2601,6 +2602,17 @@ static int btrfsic_check_all_ref_blocks(struct btrfsic_state *state, 
			       (unsigned long long)l->block_ref_to->dev_bytenr,

			       l->block_ref_to->mirror_num);

			ret = -1;

		} else if (l->block_ref_to->iodone_w_error) {

			printk(KERN_INFO "btrfs: attempt to write superblock"

			       " which references block %c @%llu (%s/%llu/%d)"

			       " which has write error!\n",

			       btrfsic_get_block_type(state, l->block_ref_to),

			       (unsigned long long)

			       l->block_ref_to->logical_bytenr,

			       l->block_ref_to->dev_state->name,

			       (unsigned long long)l->block_ref_to->dev_bytenr,

			       l->block_ref_to->mirror_num);

			ret = -1;

		} else if (l->parent_generation !=

			   l->block_ref_to->generation &&

			   BTRFSIC_GENERATION_UNKNOWN !=