diff options
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/extent-tree.c | 54 | ||||
| -rw-r--r-- | fs/btrfs/root-tree.c | 56 |
2 files changed, 56 insertions, 54 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 9870310a861b..d3b58e388535 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -4105,60 +4105,6 @@ out: return ret; } -/* - * btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation - * root: the root of the parent directory - * rsv: block reservation - * items: the number of items that we need do reservation - * use_global_rsv: allow fallback to the global block reservation - * - * This function is used to reserve the space for snapshot/subvolume - * creation and deletion. Those operations are different with the - * common file/directory operations, they change two fs/file trees - * and root tree, the number of items that the qgroup reserves is - * different with the free space reservation. So we can not use - * the space reservation mechanism in start_transaction(). - */ -int btrfs_subvolume_reserve_metadata(struct btrfs_root *root, - struct btrfs_block_rsv *rsv, int items, - bool use_global_rsv) -{ - u64 qgroup_num_bytes = 0; - u64 num_bytes; - int ret; - struct btrfs_fs_info *fs_info = root->fs_info; - struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; - - if (test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) { - /* One for parent inode, two for dir entries */ - qgroup_num_bytes = 3 * fs_info->nodesize; - ret = btrfs_qgroup_reserve_meta_prealloc(root, - qgroup_num_bytes, true); - if (ret) - return ret; - } - - num_bytes = btrfs_calc_trans_metadata_size(fs_info, items); - rsv->space_info = btrfs_find_space_info(fs_info, - BTRFS_BLOCK_GROUP_METADATA); - ret = btrfs_block_rsv_add(root, rsv, num_bytes, - BTRFS_RESERVE_FLUSH_ALL); - - if (ret == -ENOSPC && use_global_rsv) - ret = btrfs_block_rsv_migrate(global_rsv, rsv, num_bytes, true); - - if (ret && qgroup_num_bytes) - btrfs_qgroup_free_meta_prealloc(root, qgroup_num_bytes); - - return ret; -} - -void btrfs_subvolume_release_metadata(struct btrfs_fs_info *fs_info, - struct btrfs_block_rsv *rsv) -{ - btrfs_block_rsv_release(fs_info, rsv, (u64)-1); -} - static int update_block_group(struct btrfs_trans_handle *trans, u64 bytenr, u64 num_bytes, int alloc) { diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c index 22124122728c..47733fb55df7 100644 --- a/fs/btrfs/root-tree.c +++ b/fs/btrfs/root-tree.c @@ -9,6 +9,8 @@ #include "transaction.h" #include "disk-io.h" #include "print-tree.h" +#include "qgroup.h" +#include "space-info.h" /* * Read a root item from the tree. In case we detect a root item smaller then @@ -497,3 +499,57 @@ void btrfs_update_root_times(struct btrfs_trans_handle *trans, btrfs_set_stack_timespec_nsec(&item->ctime, ct.tv_nsec); spin_unlock(&root->root_item_lock); } + +/* + * btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation + * root: the root of the parent directory + * rsv: block reservation + * items: the number of items that we need do reservation + * use_global_rsv: allow fallback to the global block reservation + * + * This function is used to reserve the space for snapshot/subvolume + * creation and deletion. Those operations are different with the + * common file/directory operations, they change two fs/file trees + * and root tree, the number of items that the qgroup reserves is + * different with the free space reservation. So we can not use + * the space reservation mechanism in start_transaction(). + */ +int btrfs_subvolume_reserve_metadata(struct btrfs_root *root, + struct btrfs_block_rsv *rsv, int items, + bool use_global_rsv) +{ + u64 qgroup_num_bytes = 0; + u64 num_bytes; + int ret; + struct btrfs_fs_info *fs_info = root->fs_info; + struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv; + + if (test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) { + /* One for parent inode, two for dir entries */ + qgroup_num_bytes = 3 * fs_info->nodesize; + ret = btrfs_qgroup_reserve_meta_prealloc(root, + qgroup_num_bytes, true); + if (ret) + return ret; + } + + num_bytes = btrfs_calc_trans_metadata_size(fs_info, items); + rsv->space_info = btrfs_find_space_info(fs_info, + BTRFS_BLOCK_GROUP_METADATA); + ret = btrfs_block_rsv_add(root, rsv, num_bytes, + BTRFS_RESERVE_FLUSH_ALL); + + if (ret == -ENOSPC && use_global_rsv) + ret = btrfs_block_rsv_migrate(global_rsv, rsv, num_bytes, true); + + if (ret && qgroup_num_bytes) + btrfs_qgroup_free_meta_prealloc(root, qgroup_num_bytes); + + return ret; +} + +void btrfs_subvolume_release_metadata(struct btrfs_fs_info *fs_info, + struct btrfs_block_rsv *rsv) +{ + btrfs_block_rsv_release(fs_info, rsv, (u64)-1); +} |