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btrfs: add info when mount fails due to stale replace target

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commit f2c3bec215 upstream.

If the replace target device reappears after the suspended replace is
cancelled, it blocks the mount operation as it can't find the matching
replace-item in the metadata. As shown below,

   BTRFS error (device sda5): replace devid present without an active replace item

To overcome this situation, the user can run the command

   btrfs device scan --forget <replace target device>

and try the mount command again. And also, to avoid repeating the issue,
superblock on the devid=0 must be wiped.

   wipefs -a device-path-to-devid=0.

This patch adds some info when this situation occurs.

Reported-by: Samuel Greiner <samuel@balkonien.org>
Link: https://lore.kernel.org/linux-btrfs/b4f62b10-b295-26ea-71f9-9a5c9299d42c@balkonien.org/T/
CC: stable@vger.kernel.org # 5.0+
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Anand Jain 2022-08-12 18:32:19 +08:00 committed by Greg Kroah-Hartman
parent 40554fa41a
commit 5b44dcf8b7
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/dev-replace.c
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@ -125,7 +125,7 @@ int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info)
if (btrfs_find_device(fs_info->fs_devices,
BTRFS_DEV_REPLACE_DEVID, NULL, NULL, false)) {
btrfs_err(fs_info,
"replace devid present without an active replace item");
"replace without active item, run 'device scan --forget' on the target device");
ret = -EUCLEAN;
} else {
dev_replace->srcdev = NULL;