| Message ID | 20210914090558.79411-6-nborisov@suse.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Implement progs support for removing received uuid on RW vols | expand |
On 2021/9/14 下午5:05, Nikolay Borisov wrote: > It will be used to clear received data on RW snapshots that were > received. It would be more helpful to mention it's a backport of kernel function. > > Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: Qu Wenruo <wqu@suse.com> Thanks, Qu > --- > kernel-shared/ctree.h | 3 ++ > kernel-shared/uuid-tree.c | 82 +++++++++++++++++++++++++++++++++++++++ > 2 files changed, 85 insertions(+) > > diff --git a/kernel-shared/ctree.h b/kernel-shared/ctree.h > index 91a85796a678..158281a9fd67 100644 > --- a/kernel-shared/ctree.h > +++ b/kernel-shared/ctree.h > @@ -2860,6 +2860,9 @@ int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type, > u64 subvol_id_cpu); > > int btrfs_is_empty_uuid(u8 *uuid); > +int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type, > + u64 subid); > + > > static inline int is_fstree(u64 rootid) > { > diff --git a/kernel-shared/uuid-tree.c b/kernel-shared/uuid-tree.c > index 51a7b5d9ff5d..0f0fbf667dda 100644 > --- a/kernel-shared/uuid-tree.c > +++ b/kernel-shared/uuid-tree.c > @@ -120,3 +120,85 @@ int btrfs_is_empty_uuid(u8 *uuid) > } > return 1; > } > + > +int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type, > + u64 subid) > +{ > + struct btrfs_fs_info *fs_info = trans->fs_info; > + struct btrfs_root *uuid_root = fs_info->uuid_root; > + int ret; > + struct btrfs_path *path = NULL; > + struct btrfs_key key; > + struct extent_buffer *eb; > + int slot; > + unsigned long offset; > + u32 item_size; > + unsigned long move_dst; > + unsigned long move_src; > + unsigned long move_len; > + > + if (!uuid_root) { > + ret = -EINVAL; > + goto out; > + } > + > + btrfs_uuid_to_key(uuid, &key); > + key.type = type; > + > + path = btrfs_alloc_path(); > + if (!path) { > + ret = -ENOMEM; > + goto out; > + } > + > + ret = btrfs_search_slot(trans, uuid_root, &key, path, -1, 1); > + if (ret < 0) { > + warning("error %d while searching for uuid item!", ret); > + goto out; > + } > + if (ret > 0) { > + ret = -ENOENT; > + goto out; > + } > + > + > + eb = path->nodes[0]; > + slot = path->slots[0]; > + offset = btrfs_item_ptr_offset(eb, slot); > + item_size = btrfs_item_size_nr(eb, slot); > + if (!IS_ALIGNED(item_size, sizeof(u64))) { > + warning("uuid item with illegal size %lu!", (unsigned long)item_size); > + ret = -ENOENT; > + goto out; > + } > + while (item_size) { > + __le64 read_subid; > + > + read_extent_buffer(eb, &read_subid, offset, sizeof(read_subid)); > + if (le64_to_cpu(read_subid) == subid) > + break; > + offset += sizeof(read_subid); > + item_size -= sizeof(read_subid); > + } > + > + if (!item_size) { > + ret = -ENOENT; > + goto out; > + } > + > + item_size = btrfs_item_size_nr(eb, slot); > + if (item_size == sizeof(subid)) { > + ret = btrfs_del_item(trans, uuid_root, path); > + goto out; > + } > + > + move_dst = offset; > + move_src = offset + sizeof(subid); > + move_len = item_size - (move_src - btrfs_item_ptr_offset(eb, slot)); > + memmove_extent_buffer(eb, move_dst, move_src, move_len); > + btrfs_truncate_item(path, item_size - sizeof(subid), 1); > + > +out: > + btrfs_free_path(path); > + return ret; > +} >
diff --git a/kernel-shared/ctree.h b/kernel-shared/ctree.h index 91a85796a678..158281a9fd67 100644 --- a/kernel-shared/ctree.h +++ b/kernel-shared/ctree.h @@ -2860,6 +2860,9 @@ int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type, u64 subvol_id_cpu); int btrfs_is_empty_uuid(u8 *uuid); +int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type, + u64 subid); + static inline int is_fstree(u64 rootid) { diff --git a/kernel-shared/uuid-tree.c b/kernel-shared/uuid-tree.c index 51a7b5d9ff5d..0f0fbf667dda 100644 --- a/kernel-shared/uuid-tree.c +++ b/kernel-shared/uuid-tree.c @@ -120,3 +120,85 @@ int btrfs_is_empty_uuid(u8 *uuid) } return 1; } + +int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type, + u64 subid) +{ + struct btrfs_fs_info *fs_info = trans->fs_info; + struct btrfs_root *uuid_root = fs_info->uuid_root; + int ret; + struct btrfs_path *path = NULL; + struct btrfs_key key; + struct extent_buffer *eb; + int slot; + unsigned long offset; + u32 item_size; + unsigned long move_dst; + unsigned long move_src; + unsigned long move_len; + + if (!uuid_root) { + ret = -EINVAL; + goto out; + } + + btrfs_uuid_to_key(uuid, &key); + key.type = type; + + path = btrfs_alloc_path(); + if (!path) { + ret = -ENOMEM; + goto out; + } + + ret = btrfs_search_slot(trans, uuid_root, &key, path, -1, 1); + if (ret < 0) { + warning("error %d while searching for uuid item!", ret); + goto out; + } + if (ret > 0) { + ret = -ENOENT; + goto out; + } + + + eb = path->nodes[0]; + slot = path->slots[0]; + offset = btrfs_item_ptr_offset(eb, slot); + item_size = btrfs_item_size_nr(eb, slot); + if (!IS_ALIGNED(item_size, sizeof(u64))) { + warning("uuid item with illegal size %lu!", (unsigned long)item_size); + ret = -ENOENT; + goto out; + } + while (item_size) { + __le64 read_subid; + + read_extent_buffer(eb, &read_subid, offset, sizeof(read_subid)); + if (le64_to_cpu(read_subid) == subid) + break; + offset += sizeof(read_subid); + item_size -= sizeof(read_subid); + } + + if (!item_size) { + ret = -ENOENT; + goto out; + } + + item_size = btrfs_item_size_nr(eb, slot); + if (item_size == sizeof(subid)) { + ret = btrfs_del_item(trans, uuid_root, path); + goto out; + } + + move_dst = offset; + move_src = offset + sizeof(subid); + move_len = item_size - (move_src - btrfs_item_ptr_offset(eb, slot)); + memmove_extent_buffer(eb, move_dst, move_src, move_len); + btrfs_truncate_item(path, item_size - sizeof(subid), 1); + +out: + btrfs_free_path(path); + return ret; +}
It will be used to clear received data on RW snapshots that were received. Signed-off-by: Nikolay Borisov <nborisov@suse.com> --- kernel-shared/ctree.h | 3 ++ kernel-shared/uuid-tree.c | 82 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 85 insertions(+)