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btrfs: disable the device add feature for temp-fsid

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The device addition operation will transform the cloned temp-fsid mounted
device into a multi-device filesystem. Therefore, it is marked as
unsupported.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain
2023-10-04 23:00:26 +08:00
committed by David Sterba
parent c47b02c1bd
commit ac6ea6a914
1 changed files with 6 additions and 0 deletions
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6
fs/btrfs/ioctl.c
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@@ -2635,6 +2635,12 @@ static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg)
return -EINVAL;
}
if (fs_info->fs_devices->temp_fsid) {
btrfs_err(fs_info,
"device add not supported on cloned temp-fsid mount");
return -EINVAL;
}
if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) {
if (!btrfs_exclop_start_try_lock(fs_info, BTRFS_EXCLOP_DEV_ADD))
return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;