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| author | Qu Wenruo <quwenruo@cn.fujitsu.com> | 2017-03-09 09:34:37 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2017-08-16 16:12:02 +0200 |
| commit | 4330e183c9537df20952d4a9ee142c536fb8ae54 (patch) | |
| tree | b7e998ae879d9122c9aa597f2293afa42f6698cb /fs/btrfs/disk-io.c | |
| parent | 21634a19f6467674ef67fba9714c835a1c0a1e67 (diff) | |
| download | linux-4330e183c9537df20952d4a9ee142c536fb8ae54.tar.bz2 | |
btrfs: Do chunk level check for degraded rw mount
Now use the btrfs_check_rw_degradable() to check if we can mount in the
degraded mode.
With this patch, we can mount in the following case:
# mkfs.btrfs -f -m raid1 -d single /dev/sdb /dev/sdc
# wipefs -a /dev/sdc
# mount /dev/sdb /mnt/btrfs -o degraded
As the single data chunk is only on sdb, so it's OK to mount as
degraded, as missing one device is OK for RAID1.
But still fail in the following case as expected:
# mkfs.btrfs -f -m raid1 -d single /dev/sdb /dev/sdc
# wipefs -a /dev/sdb
# mount /dev/sdc /mnt/btrfs -o degraded
As the data chunk is only in sdb, so it's not OK to mount it as
degraded.
Reported-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Reported-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/disk-io.c')
| -rw-r--r-- | fs/btrfs/disk-io.c | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 080e2ebb8aa0..78fc7f5ab773 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -3035,15 +3035,10 @@ retry_root_backup: btrfs_err(fs_info, "failed to read block groups: %d", ret); goto fail_sysfs; } - fs_info->num_tolerated_disk_barrier_failures = - btrfs_calc_num_tolerated_disk_barrier_failures(fs_info); - if (fs_info->fs_devices->missing_devices > - fs_info->num_tolerated_disk_barrier_failures && - !(sb->s_flags & MS_RDONLY)) { + + if (!(sb->s_flags & MS_RDONLY) && !btrfs_check_rw_degradable(fs_info)) { btrfs_warn(fs_info, -"missing devices (%llu) exceeds the limit (%d), writeable mount is not allowed", - fs_info->fs_devices->missing_devices, - fs_info->num_tolerated_disk_barrier_failures); + "writeable mount is not allowed due to too many missing devices"); goto fail_sysfs; } |