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btrfs: factor __btrfs_open_devices() to create btrfs_open_one_device()

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No functional changes, create btrfs_open_one_device() from
__btrfs_open_devices(). This is a preparatory work to add dynamic
device scan.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
[ minor whitespace fixes ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2017-11-09 23:45:24 +08:00 committed by David Sterba
parent 9f050db43e
commit 0fb08bccbc
1 changed files with 65 additions and 56 deletions
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121
fs/btrfs/volumes.c
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@ -659,6 +659,70 @@ static void btrfs_free_stale_device(struct btrfs_device *cur_dev)
}
}
static int btrfs_open_one_device(struct btrfs_fs_devices *fs_devices,
struct btrfs_device *device, fmode_t flags,
void *holder)
{
struct request_queue *q;
struct block_device *bdev;
struct buffer_head *bh;
struct btrfs_super_block *disk_super;
u64 devid;
int ret;
if (device->bdev)
return -EINVAL;
if (!device->name)
return -EINVAL;
ret = btrfs_get_bdev_and_sb(device->name->str, flags, holder, 1,
&bdev, &bh);
if (ret)
return ret;
disk_super = (struct btrfs_super_block *)bh->b_data;
devid = btrfs_stack_device_id(&disk_super->dev_item);
if (devid != device->devid)
goto error_brelse;
if (memcmp(device->uuid, disk_super->dev_item.uuid, BTRFS_UUID_SIZE))
goto error_brelse;
device->generation = btrfs_super_generation(disk_super);
if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_SEEDING) {
device->writeable = 0;
fs_devices->seeding = 1;
} else {
device->writeable = !bdev_read_only(bdev);
}
q = bdev_get_queue(bdev);
if (blk_queue_discard(q))
device->can_discard = 1;
if (!blk_queue_nonrot(q))
fs_devices->rotating = 1;
device->bdev = bdev;
device->in_fs_metadata = 0;
device->mode = flags;
fs_devices->open_devices++;
if (device->writeable && device->devid != BTRFS_DEV_REPLACE_DEVID) {
fs_devices->rw_devices++;
list_add(&device->dev_alloc_list, &fs_devices->alloc_list);
}
brelse(bh);
return 0;
error_brelse:
brelse(bh);
blkdev_put(bdev, flags);
return -EINVAL;
}
/*
* Add new device to list of registered devices
*
@ -1011,76 +1075,21 @@ int btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
fmode_t flags, void *holder)
{
struct request_queue *q;
struct block_device *bdev;
struct list_head *head = &fs_devices->devices;
struct btrfs_device *device;
struct btrfs_device *latest_dev = NULL;
struct buffer_head *bh;
struct btrfs_super_block *disk_super;
u64 devid;
int ret = 0;
flags |= FMODE_EXCL;
list_for_each_entry(device, head, dev_list) {
if (device->bdev)
continue;
if (!device->name)
continue;
/* Just open everything we can; ignore failures here */
if (btrfs_get_bdev_and_sb(device->name->str, flags, holder, 1,
&bdev, &bh))
if (btrfs_open_one_device(fs_devices, device, flags, holder))
continue;
disk_super = (struct btrfs_super_block *)bh->b_data;
devid = btrfs_stack_device_id(&disk_super->dev_item);
if (devid != device->devid)
goto error_brelse;
if (memcmp(device->uuid, disk_super->dev_item.uuid,
BTRFS_UUID_SIZE))
goto error_brelse;
device->generation = btrfs_super_generation(disk_super);
if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_SEEDING) {
device->writeable = 0;
fs_devices->seeding = 1;
} else {
device->writeable = !bdev_read_only(bdev);
}
q = bdev_get_queue(bdev);
if (blk_queue_discard(q))
device->can_discard = 1;
if (!blk_queue_nonrot(q))
fs_devices->rotating = 1;
device->bdev = bdev;
device->in_fs_metadata = 0;
device->mode = flags;
fs_devices->open_devices++;
if (device->writeable &&
device->devid != BTRFS_DEV_REPLACE_DEVID) {
fs_devices->rw_devices++;
list_add(&device->dev_alloc_list,
&fs_devices->alloc_list);
}
brelse(bh);
if (!latest_dev ||
device->generation > latest_dev->generation)
latest_dev = device;
continue;
error_brelse:
brelse(bh);
blkdev_put(bdev, flags);
continue;
}
if (fs_devices->open_devices == 0) {
ret = -EINVAL;