btrfs: sysfs: export currently running exclusive operation
/sys/fs/<fsid>/exclusive_operation contains the currently executing
exclusive operation. Add a sysfs_notify() when operation end, so
userspace can be notified of exclusive operation is finished.
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 438a367..eb8f235 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -809,6 +809,42 @@ static ssize_t btrfs_checksum_show(struct kobject *kobj,
BTRFS_ATTR(, checksum, btrfs_checksum_show);
+static ssize_t btrfs_exclusive_operation_show(struct kobject *kobj,
+ struct kobj_attribute *a, char *buf)
+{
+ struct btrfs_fs_info *fs_info = to_fs_info(kobj);
+ const char *str;
+
+ switch (READ_ONCE(fs_info->exclusive_operation)) {
+ case BTRFS_EXCLOP_NONE:
+ str = "none\n";
+ break;
+ case BTRFS_EXCLOP_BALANCE:
+ str = "balance\n";
+ break;
+ case BTRFS_EXCLOP_DEV_ADD:
+ str = "device add\n";
+ break;
+ case BTRFS_EXCLOP_DEV_REMOVE:
+ str = "device remove\n";
+ break;
+ case BTRFS_EXCLOP_DEV_REPLACE:
+ str = "device replace\n";
+ break;
+ case BTRFS_EXCLOP_RESIZE:
+ str = "resize\n";
+ break;
+ case BTRFS_EXCLOP_SWAP_ACTIVATE:
+ str = "swap activate\n";
+ break;
+ default:
+ str = "UNKNOWN\n";
+ break;
+ }
+ return scnprintf(buf, PAGE_SIZE, "%s", str);
+}
+BTRFS_ATTR(, exclusive_operation, btrfs_exclusive_operation_show);
+
static const struct attribute *btrfs_attrs[] = {
BTRFS_ATTR_PTR(, label),
BTRFS_ATTR_PTR(, nodesize),
@@ -817,6 +853,7 @@ static const struct attribute *btrfs_attrs[] = {
BTRFS_ATTR_PTR(, quota_override),
BTRFS_ATTR_PTR(, metadata_uuid),
BTRFS_ATTR_PTR(, checksum),
+ BTRFS_ATTR_PTR(, exclusive_operation),
NULL,
};