diff options
Diffstat (limited to 'fs/btrfs/ioctl.c')
| -rw-r--r-- | fs/btrfs/ioctl.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index a7739461533d..c4e710ea08ba 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -353,15 +353,29 @@ update_flags: return ret; } +/* + * Start exclusive operation @type, return true on success + */ bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, enum btrfs_exclusive_operation type) { - return !cmpxchg(&fs_info->exclusive_operation, BTRFS_EXCLOP_NONE, type); + bool ret = false; + + spin_lock(&fs_info->super_lock); + if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) { + fs_info->exclusive_operation = type; + ret = true; + } + spin_unlock(&fs_info->super_lock); + + return ret; } void btrfs_exclop_finish(struct btrfs_fs_info *fs_info) { + spin_lock(&fs_info->super_lock); WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE); + spin_unlock(&fs_info->super_lock); sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation"); } |