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Commit 36350e95 authored by Gu Jinxiang's avatar Gu Jinxiang Committed by David Sterba
Browse files

btrfs: return device pointer from btrfs_scan_one_device 



Return device pointer (with the IS_ERR semantics) from
btrfs_scan_one_device so we don't have to return in through pointer.

And since btrfs_fs_devices can be obtained from btrfs_device, return that.

Signed-off-by: default avatarGu Jinxiang <gujx@cn.fujitsu.com>
Reviewed-by: default avatarNikolay Borisov <nborisov@suse.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
[ fixed conflics after recent changes to btrfs_scan_one_device ]
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent d64dcbd1

fs/btrfs/super.c

+21 −13
Original line number Diff line number Diff line
@@ -888,7 +888,7 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags, 
{

	substring_t args[MAX_OPT_ARGS];

	char *device_name, *opts, *orig, *p;

	struct btrfs_fs_devices *fs_devices = NULL;

	struct btrfs_device *device = NULL;

	int error = 0;



	lockdep_assert_held(&uuid_mutex);
@@ -918,13 +918,15 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags, 
				error = -ENOMEM;

				goto out;

			}

			error = btrfs_scan_one_device(device_name,

					flags, holder, &fs_devices);

			device = btrfs_scan_one_device(device_name, flags,

					holder);

			kfree(device_name);

			if (error)

			if (IS_ERR(device)) {

				error = PTR_ERR(device);

				goto out;

			}

		}

	}



out:

	kfree(orig);
@@ -1518,6 +1520,7 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type, 
{

	struct block_device *bdev = NULL;

	struct super_block *s;

	struct btrfs_device *device = NULL;

	struct btrfs_fs_devices *fs_devices = NULL;

	struct btrfs_fs_info *fs_info = NULL;

	struct security_mnt_opts new_sec_opts;
@@ -1561,12 +1564,14 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type, 
		goto error_fs_info;

	}



	error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices);

	if (error) {

	device = btrfs_scan_one_device(device_name, mode, fs_type);

	if (IS_ERR(device)) {

		mutex_unlock(&uuid_mutex);

		error = PTR_ERR(device);

		goto error_fs_info;

	}



	fs_devices = device->fs_devices;

	fs_info->fs_devices = fs_devices;



	error = btrfs_open_devices(fs_devices, mode, fs_type);
@@ -2227,7 +2232,7 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd, 
				unsigned long arg)

{

	struct btrfs_ioctl_vol_args *vol;

	struct btrfs_fs_devices *fs_devices;

	struct btrfs_device *device = NULL;

	int ret = -ENOTTY;



	if (!capable(CAP_SYS_ADMIN))
@@ -2240,19 +2245,22 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd, 
	switch (cmd) {

	case BTRFS_IOC_SCAN_DEV:

		mutex_lock(&uuid_mutex);

		ret = btrfs_scan_one_device(vol->name, FMODE_READ,

					    &btrfs_root_fs_type, &fs_devices);

		device = btrfs_scan_one_device(vol->name, FMODE_READ,

					       &btrfs_root_fs_type);

		ret = PTR_ERR_OR_ZERO(device);

		mutex_unlock(&uuid_mutex);

		break;

	case BTRFS_IOC_DEVICES_READY:

		mutex_lock(&uuid_mutex);

		ret = btrfs_scan_one_device(vol->name, FMODE_READ,

					    &btrfs_root_fs_type, &fs_devices);

		if (ret) {

		device = btrfs_scan_one_device(vol->name, FMODE_READ,

					       &btrfs_root_fs_type);

		if (IS_ERR(device)) {

			mutex_unlock(&uuid_mutex);

			ret = PTR_ERR(device);

			break;

		}

		ret = !(fs_devices->num_devices == fs_devices->total_devices);

		ret = !(device->fs_devices->num_devices ==

			device->fs_devices->total_devices);

		mutex_unlock(&uuid_mutex);

		break;

	case BTRFS_IOC_GET_SUPPORTED_FEATURES:

fs/btrfs/volumes.c

+7 −11
Original line number Diff line number Diff line
@@ -1213,15 +1213,14 @@ static int btrfs_read_disk_super(struct block_device *bdev, u64 bytenr, 
 * and we are not allowed to call set_blocksize during the scan. The superblock

 * is read via pagecache

 */

int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,

			  struct btrfs_fs_devices **fs_devices_ret)

struct btrfs_device *btrfs_scan_one_device(const char *path, fmode_t flags,

					   void *holder)

{

	struct btrfs_super_block *disk_super;

	bool new_device_added = false;

	struct btrfs_device *device;

	struct btrfs_device *device = NULL;

	struct block_device *bdev;

	struct page *page;

	int ret = 0;

	u64 bytenr;



	lockdep_assert_held(&uuid_mutex);
@@ -1237,18 +1236,15 @@ int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, 


	bdev = blkdev_get_by_path(path, flags, holder);

	if (IS_ERR(bdev))

		return PTR_ERR(bdev);

		return ERR_CAST(bdev);



	if (btrfs_read_disk_super(bdev, bytenr, &page, &disk_super)) {

		ret = -EINVAL;

		device = ERR_PTR(-EINVAL);

		goto error_bdev_put;

	}



	device = device_list_add(path, disk_super, &new_device_added);

	if (IS_ERR(device)) {

		ret = PTR_ERR(device);

	} else {

		*fs_devices_ret = device->fs_devices;

	if (!IS_ERR(device)) {

		if (new_device_added)

			btrfs_free_stale_devices(path, device);

	}
@@ -1258,7 +1254,7 @@ int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, 
error_bdev_put:

	blkdev_put(bdev, flags);



	return ret;

	return device;

}



static int contains_pending_extent(struct btrfs_transaction *transaction,

fs/btrfs/volumes.h

+2 −2
Original line number Diff line number Diff line
@@ -403,8 +403,8 @@ blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio, 
			   int mirror_num, int async_submit);

int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,

		       fmode_t flags, void *holder);

int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,

			  struct btrfs_fs_devices **fs_devices_ret);

struct btrfs_device *btrfs_scan_one_device(const char *path,

					   fmode_t flags, void *holder);

int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);

void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices, int step);

void btrfs_assign_next_active_device(struct btrfs_fs_info *fs_info,