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| author | Stefan Behrens <sbehrens@giantdisaster.de> | 2012-05-04 15:16:07 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2012-05-04 15:16:07 -0400 |
| commit | ea9947b4395fa34666086b2fa6f686e94903e047 (patch) | |
| tree | 086ab5150fc7f37b2070ab1200bf8b5275c85f06 /fs/btrfs | |
| parent | d04b1debc92535453df2494d0b019edf0bb91003 (diff) | |
| download | linux-stable-ea9947b4395fa34666086b2fa6f686e94903e047.tar.gz linux-stable-ea9947b4395fa34666086b2fa6f686e94903e047.tar.bz2 linux-stable-ea9947b4395fa34666086b2fa6f686e94903e047.zip | |
Btrfs: fix crash in scrub repair code when device is missing
Fix that when scrub tries to repair an I/O or checksum error and one of
the devices containing the mirror is missing, it crashes in bio_add_page
because the bdev is a NULL pointer for missing devices.
Reported-by: Marco L. Crociani <marco.crociani@gmail.com>
Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/scrub.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c index b679bf68861e..7e487be0094e 100644 --- a/fs/btrfs/scrub.c +++ b/fs/btrfs/scrub.c @@ -998,6 +998,7 @@ static int scrub_setup_recheck_block(struct scrub_dev *sdev, page = sblock->pagev + page_index; page->logical = logical; page->physical = bbio->stripes[mirror_index].physical; + /* for missing devices, bdev is NULL */ page->bdev = bbio->stripes[mirror_index].dev->bdev; page->mirror_num = mirror_index + 1; page->page = alloc_page(GFP_NOFS); @@ -1042,6 +1043,12 @@ static int scrub_recheck_block(struct btrfs_fs_info *fs_info, struct scrub_page *page = sblock->pagev + page_num; DECLARE_COMPLETION_ONSTACK(complete); + if (page->bdev == NULL) { + page->io_error = 1; + sblock->no_io_error_seen = 0; + continue; + } + BUG_ON(!page->page); bio = bio_alloc(GFP_NOFS, 1); if (!bio) |