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
--- 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
--- 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
--- 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
--- 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);
