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| author |   Wang Shilong <wangsl.fnst@cn.fujitsu.com> | 2014-06-11 10:55:22 +0800 |
|---|---|---|
| committer |   Chris Mason <clm@fb.com> | 2014-06-13 09:52:21 -0700 |
| commit | 5fbc7c59fd22c5a6531b40b0759624b680a95e52 (patch) | |
| tree | dfd0fff7de04cc8250bfd1128bfac9f9ccff3601 /tools/perf/scripts/python/syscall-counts.py | |
| parent | btrfs: new ioctl TREE_SEARCH_V2 (diff) | |
| download | wireguard-linux-5fbc7c59fd22c5a6531b40b0759624b680a95e52.tar.xz wireguard-linux-5fbc7c59fd22c5a6531b40b0759624b680a95e52.zip | |
Btrfs: fix unfinished readahead thread for raid5/6 degraded mounting
Steps to reproduce:
# mkfs.btrfs -f /dev/sd[b-f] -m raid5 -d raid5
# mkfs.ext4 /dev/sdc --->corrupt one of btrfs device
# mount /dev/sdb /mnt -o degraded
# btrfs scrub start -BRd /mnt
This is because readahead would skip missing device, this is not true
for RAID5/6, because REQ_GET_READ_MIRRORS return 1 for RAID5/6 block
mapping. If expected data locates in missing device, readahead thread
would not call __readahead_hook() which makes event @rc->elems=0
wait forever.
Fix this problem by checking return value of btrfs_map_block(),we
can only skip missing device safely if there are several mirrors.
Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'tools/perf/scripts/python/syscall-counts.py')
0 files changed, 0 insertions, 0 deletions