btrfs: Use wrapper macro for rcu string to remove duplicate code

Cleanup patch and no functional changes.

Signed-off-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 6eaaddd..d3a5d2a 100644 (file)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3157,10 +3157,8 @@ static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info,
        di_args->total_bytes = btrfs_device_get_total_bytes(dev);
        memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
        if (dev->name) {
-               struct rcu_string *name;
-
-               name = rcu_dereference(dev->name);
-               strncpy(di_args->path, name->str, sizeof(di_args->path) - 1);
+               strncpy(di_args->path, rcu_str_deref(dev->name),
+                               sizeof(di_args->path) - 1);
                di_args->path[sizeof(di_args->path) - 1] = 0;
        } else {
                di_args->path[0] = '\0';

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index c4eb9ec..3be1456 100644 (file)
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -3779,7 +3779,6 @@ int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
        struct scrub_ctx *sctx;
        int ret;
        struct btrfs_device *dev;
-       struct rcu_string *name;
 
        if (btrfs_fs_closing(fs_info))
                return -EINVAL;
@@ -3833,11 +3832,8 @@ int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
        if (!is_dev_replace && !readonly &&
            !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state)) {
                mutex_unlock(&fs_info->fs_devices->device_list_mutex);
-               rcu_read_lock();
-               name = rcu_dereference(dev->name);
-               btrfs_err(fs_info, "scrub: device %s is not writable",
-                         name->str);
-               rcu_read_unlock();
+               btrfs_err_in_rcu(fs_info, "scrub: device %s is not writable",
+                               rcu_str_deref(dev->name));
                return -EROFS;
        }
 

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 67de3c0..6601c9a 100644 (file)
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -2303,7 +2303,6 @@ static int btrfs_show_devname(struct seq_file *m, struct dentry *root)
        struct btrfs_fs_devices *cur_devices;
        struct btrfs_device *dev, *first_dev = NULL;
        struct list_head *head;
-       struct rcu_string *name;
 
        /*
         * Lightweight locking of the devices. We should not need
@@ -2327,12 +2326,10 @@ static int btrfs_show_devname(struct seq_file *m, struct dentry *root)
                cur_devices = cur_devices->seed;
        }
 
-       if (first_dev) {
-               name = rcu_dereference(first_dev->name);
-               seq_escape(m, name->str, " \t\n\\");
-       } else {
+       if (first_dev)
+               seq_escape(m, rcu_str_deref(first_dev->name), " \t\n\\");
+       else
                WARN_ON(1);
-       }
        rcu_read_unlock();
        return 0;
 }

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index d86346f..7497720 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -6094,21 +6094,11 @@ static void submit_stripe_bio(struct btrfs_bio *bbio, struct bio *bio,
        btrfs_io_bio(bio)->stripe_index = dev_nr;
        bio->bi_end_io = btrfs_end_bio;
        bio->bi_iter.bi_sector = physical >> 9;
-#ifdef DEBUG
-       {
-               struct rcu_string *name;
-
-               rcu_read_lock();
-               name = rcu_dereference(dev->name);
-               btrfs_debug(fs_info,
-                       "btrfs_map_bio: rw %d 0x%x, sector=%llu, dev=%lu (%s id %llu), size=%u",
-                       bio_op(bio), bio->bi_opf,
-                       (u64)bio->bi_iter.bi_sector,
-                       (u_long)dev->bdev->bd_dev, name->str, dev->devid,
-                       bio->bi_iter.bi_size);
-               rcu_read_unlock();
-       }
-#endif
+       btrfs_debug_in_rcu(fs_info,
+       "btrfs_map_bio: rw %d 0x%x, sector=%llu, dev=%lu (%s id %llu), size=%u",
+               bio_op(bio), bio->bi_opf, (u64)bio->bi_iter.bi_sector,
+               (u_long)dev->bdev->bd_dev, rcu_str_deref(dev->name), dev->devid,
+               bio->bi_iter.bi_size);
        bio_set_dev(bio, dev->bdev);
 
        btrfs_bio_counter_inc_noblocked(fs_info);