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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: Stefan Behrens <sbehrens@giantdisaster.de>
This commit is contained in:
Stefan Behrens 2012-07-31 11:09:44 -06:00 committed by Chris Mason
parent bedb2cca72
commit 62856a9b73
1 changed files with 14 additions and 2 deletions
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16
fs/btrfs/check-integrity.c
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@ -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 !=