Btrfs: Add support for device scanning and detection ioctls
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 4890151..f971a29 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -365,12 +365,12 @@
struct list_head *next;
struct btrfs_device *device;
- list = &fs_info->devices;
- while(!list_empty(list)) {
- next = list->next;
- list_del(next);
+ list = &fs_info->fs_devices->devices;
+ list_for_each(next, list) {
device = list_entry(next, struct btrfs_device, dev_list);
- kfree(device);
+ if (device->bdev && device->bdev != fs_info->sb->s_bdev)
+ close_bdev_excl(device->bdev);
+ device->bdev = NULL;
}
return 0;
}
@@ -655,7 +655,8 @@
return 0;
}
#endif
-struct btrfs_root *open_ctree(struct super_block *sb)
+struct btrfs_root *open_ctree(struct super_block *sb,
+ struct btrfs_fs_devices *fs_devices)
{
u32 sectorsize;
u32 nodesize;
@@ -697,8 +698,8 @@
fs_info->extent_root = extent_root;
fs_info->chunk_root = chunk_root;
fs_info->dev_root = dev_root;
+ fs_info->fs_devices = fs_devices;
INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
- INIT_LIST_HEAD(&fs_info->devices);
INIT_LIST_HEAD(&fs_info->space_info);
btrfs_mapping_init(&fs_info->mapping_tree);
fs_info->sb = sb;
@@ -779,6 +780,12 @@
if (!btrfs_super_root(disk_super))
goto fail_sb_buffer;
+ if (btrfs_super_num_devices(disk_super) != fs_devices->num_devices) {
+ printk("Btrfs: wanted %llu devices, but found %llu\n",
+ (unsigned long long)btrfs_super_num_devices(disk_super),
+ (unsigned long long)fs_devices->num_devices);
+ goto fail_sb_buffer;
+ }
nodesize = btrfs_super_nodesize(disk_super);
leafsize = btrfs_super_leafsize(disk_super);
sectorsize = btrfs_super_sectorsize(disk_super);
@@ -799,8 +806,6 @@
}
mutex_lock(&fs_info->fs_mutex);
- ret = btrfs_read_super_device(tree_root, fs_info->sb_buffer);
- BUG_ON(ret);
ret = btrfs_read_sys_array(tree_root);
BUG_ON(ret);
@@ -859,6 +864,7 @@
fail_iput:
iput(fs_info->btree_inode);
fail:
+ close_all_devices(fs_info);
kfree(extent_root);
kfree(tree_root);
kfree(fs_info);