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| author | Eryu Guan <guaneryu@gmail.com> | 2014-10-13 08:42:12 +0400 |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2014-11-21 04:14:28 +0300 |
| commit | 2fc9f6baa24ac230166df41ed636224969523341 (patch) | |
| tree | 41ea291cb5ab8d7d1eef3c4c5a49afddec266a1b /fs/btrfs/dev-replace.c | |
| parent | 6b3a4d60dbf7a60b91d810498e8c212f26718efd (diff) | |
| download | linux-2fc9f6baa24ac230166df41ed636224969523341.tar.xz | |
Btrfs: return failure if btrfs_dev_replace_finishing() failed
device replace could fail due to another running scrub process or any
other errors btrfs_scrub_dev() may hit, but this failure doesn't get
returned to userspace.
The following steps could reproduce this issue
mkfs -t btrfs -f /dev/sdb1 /dev/sdb2
mount /dev/sdb1 /mnt/btrfs
while true; do btrfs scrub start -B /mnt/btrfs >/dev/null 2>&1; done &
btrfs replace start -Bf /dev/sdb2 /dev/sdb3 /mnt/btrfs
# if this replace succeeded, do the following and repeat until
# you see this log in dmesg
# BTRFS: btrfs_scrub_dev(/dev/sdb2, 2, /dev/sdb3) failed -115
#btrfs replace start -Bf /dev/sdb3 /dev/sdb2 /mnt/btrfs
# once you see the error log in dmesg, check return value of
# replace
echo $?
Introduce a new dev replace result
BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS
to catch -EINPROGRESS explicitly and return other errors directly to
userspace.
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs/dev-replace.c')
| -rw-r--r-- | fs/btrfs/dev-replace.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c index 6f662b34ba0e..971c061eb1ce 100644 --- a/fs/btrfs/dev-replace.c +++ b/fs/btrfs/dev-replace.c @@ -422,9 +422,15 @@ int btrfs_dev_replace_start(struct btrfs_root *root, &dev_replace->scrub_progress, 0, 1); ret = btrfs_dev_replace_finishing(root->fs_info, ret); - WARN_ON(ret); + /* don't warn if EINPROGRESS, someone else might be running scrub */ + if (ret == -EINPROGRESS) { + args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS; + ret = 0; + } else { + WARN_ON(ret); + } - return 0; + return ret; leave: dev_replace->srcdev = NULL; @@ -542,7 +548,7 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); - return 0; + return scrub_ret; } printk_in_rcu(KERN_INFO |