From: Josef Bacik Date: Wed, 15 Dec 2021 20:40:07 +0000 (-0500) Subject: btrfs: add code to support the block group root X-Git-Tag: baikal/aarch64/sdk6.1~4442^2~64 X-Git-Url: https://git.baikalelectronics.ru/sdk/?a=commitdiff_plain;h=3397f3aba3a83ae5cc9202a2e38fddc513066628;p=kernel.git btrfs: add code to support the block group root This code adds the on disk structures for the block group root, which will hold the block group items for extent tree v2. Signed-off-by: Josef Bacik Signed-off-by: David Sterba --- diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 54424b3411323..f460a7bb9ae8f 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -274,8 +274,14 @@ struct btrfs_super_block { /* the UUID written into btree blocks */ u8 metadata_uuid[BTRFS_FSID_SIZE]; + /* Extent tree v2 */ + __le64 block_group_root; + __le64 block_group_root_generation; + u8 block_group_root_level; + /* future expansion */ - __le64 reserved[28]; + u8 reserved8[7]; + __le64 reserved[25]; u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE]; struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS]; @@ -657,6 +663,7 @@ struct btrfs_fs_info { struct btrfs_root *quota_root; struct btrfs_root *uuid_root; struct btrfs_root *data_reloc_root; + struct btrfs_root *block_group_root; /* the log root tree is a directory of all the other log roots */ struct btrfs_root *log_root_tree; @@ -2349,6 +2356,17 @@ BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup, BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup, num_devices, 64); +/* + * For extent tree v2 we overload the extent root with the block group root, as + * we will have multiple extent roots. + */ +BTRFS_SETGET_STACK_FUNCS(backup_block_group_root, struct btrfs_root_backup, + extent_root, 64); +BTRFS_SETGET_STACK_FUNCS(backup_block_group_root_gen, struct btrfs_root_backup, + extent_root_gen, 64); +BTRFS_SETGET_STACK_FUNCS(backup_block_group_root_level, + struct btrfs_root_backup, extent_root_level, 8); + /* struct btrfs_balance_item */ BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64); @@ -2483,6 +2501,13 @@ BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block, BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64); BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block, uuid_tree_generation, 64); +BTRFS_SETGET_STACK_FUNCS(super_block_group_root, struct btrfs_super_block, + block_group_root, 64); +BTRFS_SETGET_STACK_FUNCS(super_block_group_root_generation, + struct btrfs_super_block, + block_group_root_generation, 64); +BTRFS_SETGET_STACK_FUNCS(super_block_group_root_level, struct btrfs_super_block, + block_group_root_level, 8); int btrfs_super_csum_size(const struct btrfs_super_block *s); const char *btrfs_super_csum_name(u16 csum_type); diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index e014cb8413c7b..fe1349737edbc 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1727,6 +1727,7 @@ void btrfs_free_fs_info(struct btrfs_fs_info *fs_info) btrfs_put_root(fs_info->uuid_root); btrfs_put_root(fs_info->fs_root); btrfs_put_root(fs_info->data_reloc_root); + btrfs_put_root(fs_info->block_group_root); btrfs_check_leaked_roots(fs_info); btrfs_extent_buffer_leak_debug_check(fs_info); kfree(fs_info->super_copy); @@ -2095,7 +2096,6 @@ static void backup_super_roots(struct btrfs_fs_info *info) { const int next_backup = info->backup_root_index; struct btrfs_root_backup *root_backup; - struct btrfs_root *extent_root = btrfs_extent_root(info, 0); struct btrfs_root *csum_root = btrfs_csum_root(info, 0); root_backup = info->super_for_commit->super_roots + next_backup; @@ -2121,11 +2121,23 @@ static void backup_super_roots(struct btrfs_fs_info *info) btrfs_set_backup_chunk_root_level(root_backup, btrfs_header_level(info->chunk_root->node)); - btrfs_set_backup_extent_root(root_backup, extent_root->node->start); - btrfs_set_backup_extent_root_gen(root_backup, - btrfs_header_generation(extent_root->node)); - btrfs_set_backup_extent_root_level(root_backup, - btrfs_header_level(extent_root->node)); + if (btrfs_fs_incompat(info, EXTENT_TREE_V2)) { + btrfs_set_backup_block_group_root(root_backup, + info->block_group_root->node->start); + btrfs_set_backup_block_group_root_gen(root_backup, + btrfs_header_generation(info->block_group_root->node)); + btrfs_set_backup_block_group_root_level(root_backup, + btrfs_header_level(info->block_group_root->node)); + } else { + struct btrfs_root *extent_root = btrfs_extent_root(info, 0); + + btrfs_set_backup_extent_root(root_backup, + extent_root->node->start); + btrfs_set_backup_extent_root_gen(root_backup, + btrfs_header_generation(extent_root->node)); + btrfs_set_backup_extent_root_level(root_backup, + btrfs_header_level(extent_root->node)); + } /* * we might commit during log recovery, which happens before we set @@ -2269,6 +2281,7 @@ static void free_root_pointers(struct btrfs_fs_info *info, bool free_chunk_root) free_root_extent_buffers(info->uuid_root); free_root_extent_buffers(info->fs_root); free_root_extent_buffers(info->data_reloc_root); + free_root_extent_buffers(info->block_group_root); if (free_chunk_root) free_root_extent_buffers(info->chunk_root); } @@ -2964,8 +2977,20 @@ static int load_important_roots(struct btrfs_fs_info *fs_info) gen = btrfs_super_generation(sb); level = btrfs_super_root_level(sb); ret = load_super_root(fs_info->tree_root, bytenr, gen, level); - if (ret) + if (ret) { btrfs_warn(fs_info, "couldn't read tree root"); + return ret; + } + + if (!btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) + return 0; + + bytenr = btrfs_super_block_group_root(sb); + gen = btrfs_super_block_group_root_generation(sb); + level = btrfs_super_block_group_root_level(sb); + ret = load_super_root(fs_info->block_group_root, bytenr, gen, level); + if (ret) + btrfs_warn(fs_info, "couldn't read block group root"); return ret; } @@ -2978,6 +3003,16 @@ static int __cold init_tree_roots(struct btrfs_fs_info *fs_info) int ret = 0; int i; + if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { + struct btrfs_root *root; + + root = btrfs_alloc_root(fs_info, BTRFS_BLOCK_GROUP_TREE_OBJECTID, + GFP_KERNEL); + if (!root) + return -ENOMEM; + fs_info->block_group_root = root; + } + for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) { if (handle_error) { if (!IS_ERR(tree_root->node)) diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h index 5e8bef4b7563a..2e10514ecda85 100644 --- a/fs/btrfs/disk-io.h +++ b/fs/btrfs/disk-io.h @@ -111,6 +111,8 @@ static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root) static inline struct btrfs_root *btrfs_block_group_root(struct btrfs_fs_info *fs_info) { + if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) + return fs_info->block_group_root; return btrfs_extent_root(fs_info, 0); } diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c index 0775ae9f44192..524fdb0ddd74b 100644 --- a/fs/btrfs/print-tree.c +++ b/fs/btrfs/print-tree.c @@ -23,6 +23,7 @@ static const struct root_name_map root_map[] = { { BTRFS_QUOTA_TREE_OBJECTID, "QUOTA_TREE" }, { BTRFS_UUID_TREE_OBJECTID, "UUID_TREE" }, { BTRFS_FREE_SPACE_TREE_OBJECTID, "FREE_SPACE_TREE" }, + { BTRFS_BLOCK_GROUP_TREE_OBJECTID, "BLOCK_GROUP_TREE" }, { BTRFS_DATA_RELOC_TREE_OBJECTID, "DATA_RELOC_TREE" }, }; diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h index 0d729664b4b41..f068ff30d6541 100644 --- a/include/trace/events/btrfs.h +++ b/include/trace/events/btrfs.h @@ -53,6 +53,7 @@ struct btrfs_space_info; { BTRFS_TREE_RELOC_OBJECTID, "TREE_RELOC" }, \ { BTRFS_UUID_TREE_OBJECTID, "UUID_TREE" }, \ { BTRFS_FREE_SPACE_TREE_OBJECTID, "FREE_SPACE_TREE" }, \ + { BTRFS_BLOCK_GROUP_TREE_OBJECTID, "BLOCK_GROUP_TREE" },\ { BTRFS_DATA_RELOC_TREE_OBJECTID, "DATA_RELOC_TREE" }) #define show_root_type(obj) \ diff --git a/include/uapi/linux/btrfs_tree.h b/include/uapi/linux/btrfs_tree.h index 5416f1f1a77a8..b069752a8ecfd 100644 --- a/include/uapi/linux/btrfs_tree.h +++ b/include/uapi/linux/btrfs_tree.h @@ -53,6 +53,9 @@ /* tracks free space in block groups. */ #define BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL +/* Holds the block group items for extent tree v2. */ +#define BTRFS_BLOCK_GROUP_TREE_OBJECTID 11ULL + /* device stats in the device tree */ #define BTRFS_DEV_STATS_OBJECTID 0ULL