From 70f6d82ec73c3ae2d3adc6853c5bebcd73610097 Mon Sep 17 00:00:00 2001 From: Omar Sandoval Date: Tue, 29 Sep 2015 20:50:38 -0700 Subject: [PATCH] Btrfs: add free space tree mount option Now we can finally hook up everything so we can actually use free space tree. The free space tree is enabled by passing the space_cache=v2 mount option. On the first mount with the this option set, the free space tree will be created and the FREE_SPACE_TREE read-only compat bit will be set. Any time the filesystem is mounted from then on, we must use the free space tree. The clear_cache option will also clear the free space tree. Signed-off-by: Omar Sandoval Signed-off-by: Chris Mason --- fs/btrfs/ctree.h | 7 +++++- fs/btrfs/disk-io.c | 38 +++++++++++++++++++++++++++++++++ fs/btrfs/super.c | 53 ++++++++++++++++++++++++++++++++++++++-------- 3 files changed, 88 insertions(+), 10 deletions(-) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 0888c3e2cc7d..ed610f9c04b2 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -531,7 +531,10 @@ struct btrfs_super_block { #define BTRFS_FEATURE_COMPAT_SUPP 0ULL #define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL -#define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL + +#define BTRFS_FEATURE_COMPAT_RO_SUPP \ + (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE) + #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET 0ULL #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR 0ULL @@ -2203,6 +2206,7 @@ struct btrfs_ioctl_defrag_range_args { #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21) #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR (1 << 22) #define BTRFS_MOUNT_RESCAN_UUID_TREE (1 << 23) +#define BTRFS_MOUNT_FREE_SPACE_TREE (1 << 24) #define BTRFS_DEFAULT_COMMIT_INTERVAL (30) #define BTRFS_DEFAULT_MAX_INLINE (8192) @@ -3744,6 +3748,7 @@ static inline void free_fs_info(struct btrfs_fs_info *fs_info) kfree(fs_info->csum_root); kfree(fs_info->quota_root); kfree(fs_info->uuid_root); + kfree(fs_info->free_space_root); kfree(fs_info->super_copy); kfree(fs_info->super_for_commit); security_free_mnt_opts(&fs_info->security_opts); diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 1e60d00d4ea7..af7ac28380c2 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -42,6 +42,7 @@ #include "locking.h" #include "tree-log.h" #include "free-space-cache.h" +#include "free-space-tree.h" #include "inode-map.h" #include "check-integrity.h" #include "rcu-string.h" @@ -1647,6 +1648,9 @@ struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info, if (location->objectid == BTRFS_UUID_TREE_OBJECTID) return fs_info->uuid_root ? fs_info->uuid_root : ERR_PTR(-ENOENT); + if (location->objectid == BTRFS_FREE_SPACE_TREE_OBJECTID) + return fs_info->free_space_root ? fs_info->free_space_root : + ERR_PTR(-ENOENT); again: root = btrfs_lookup_fs_root(fs_info, location->objectid); if (root) { @@ -2144,6 +2148,7 @@ static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root) free_root_extent_buffers(info->uuid_root); if (chunk_root) free_root_extent_buffers(info->chunk_root); + free_root_extent_buffers(info->free_space_root); } void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info) @@ -2445,6 +2450,15 @@ static int btrfs_read_roots(struct btrfs_fs_info *fs_info, fs_info->uuid_root = root; } + if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) { + location.objectid = BTRFS_FREE_SPACE_TREE_OBJECTID; + root = btrfs_read_tree_root(tree_root, &location); + if (IS_ERR(root)) + return PTR_ERR(root); + set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); + fs_info->free_space_root = root; + } + return 0; } @@ -3073,6 +3087,30 @@ int open_ctree(struct super_block *sb, btrfs_qgroup_rescan_resume(fs_info); + if (btrfs_test_opt(tree_root, CLEAR_CACHE) && + btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) { + pr_info("BTRFS: clearing free space tree\n"); + ret = btrfs_clear_free_space_tree(fs_info); + if (ret) { + pr_warn("BTRFS: failed to clear free space tree %d\n", + ret); + close_ctree(tree_root); + return ret; + } + } + + if (btrfs_test_opt(tree_root, FREE_SPACE_TREE) && + !btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) { + pr_info("BTRFS: creating free space tree\n"); + ret = btrfs_create_free_space_tree(fs_info); + if (ret) { + pr_warn("BTRFS: failed to create free space tree %d\n", + ret); + close_ctree(tree_root); + return ret; + } + } + if (!fs_info->uuid_root) { pr_info("BTRFS: creating UUID tree\n"); ret = btrfs_create_uuid_tree(fs_info); diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 442bf434b783..bfdaf123f4e9 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -312,10 +312,11 @@ enum { Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, Opt_compress_type, Opt_compress_force, Opt_compress_force_type, Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, - Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed, - Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, Opt_inode_cache, - Opt_no_space_cache, Opt_recovery, Opt_skip_balance, - Opt_check_integrity, Opt_check_integrity_including_extent_data, + Opt_space_cache, Opt_space_cache_version, Opt_clear_cache, + Opt_user_subvol_rm_allowed, Opt_enospc_debug, Opt_subvolrootid, + Opt_defrag, Opt_inode_cache, Opt_no_space_cache, Opt_recovery, + Opt_skip_balance, Opt_check_integrity, + Opt_check_integrity_including_extent_data, Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree, Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard, Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow, @@ -354,6 +355,7 @@ static match_table_t tokens = { {Opt_discard, "discard"}, {Opt_nodiscard, "nodiscard"}, {Opt_space_cache, "space_cache"}, + {Opt_space_cache_version, "space_cache=%s"}, {Opt_clear_cache, "clear_cache"}, {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, {Opt_enospc_debug, "enospc_debug"}, @@ -392,7 +394,9 @@ int btrfs_parse_options(struct btrfs_root *root, char *options) bool compress_force = false; cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); - if (cache_gen) + if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE)) + btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE); + else if (cache_gen) btrfs_set_opt(info->mount_opt, SPACE_CACHE); if (!options) @@ -626,15 +630,35 @@ int btrfs_parse_options(struct btrfs_root *root, char *options) "turning off discard"); break; case Opt_space_cache: - btrfs_set_and_info(root, SPACE_CACHE, - "enabling disk space caching"); + case Opt_space_cache_version: + if (token == Opt_space_cache || + strcmp(args[0].from, "v1") == 0) { + btrfs_clear_opt(root->fs_info->mount_opt, + FREE_SPACE_TREE); + btrfs_set_and_info(root, SPACE_CACHE, + "enabling disk space caching"); + } else if (strcmp(args[0].from, "v2") == 0) { + btrfs_clear_opt(root->fs_info->mount_opt, + SPACE_CACHE); + btrfs_set_and_info(root, FREE_SPACE_TREE, + "enabling free space tree"); + } else { + ret = -EINVAL; + goto out; + } break; case Opt_rescan_uuid_tree: btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); break; case Opt_no_space_cache: - btrfs_clear_and_info(root, SPACE_CACHE, - "disabling disk space caching"); + if (btrfs_test_opt(root, SPACE_CACHE)) { + btrfs_clear_and_info(root, SPACE_CACHE, + "disabling disk space caching"); + } + if (btrfs_test_opt(root, FREE_SPACE_TREE)) { + btrfs_clear_and_info(root, FREE_SPACE_TREE, + "disabling free space tree"); + } break; case Opt_inode_cache: btrfs_set_pending_and_info(info, INODE_MAP_CACHE, @@ -747,8 +771,17 @@ int btrfs_parse_options(struct btrfs_root *root, char *options) } } out: + if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE) && + !btrfs_test_opt(root, FREE_SPACE_TREE) && + !btrfs_test_opt(root, CLEAR_CACHE)) { + btrfs_err(root->fs_info, "cannot disable free space tree"); + ret = -EINVAL; + + } if (!ret && btrfs_test_opt(root, SPACE_CACHE)) btrfs_info(root->fs_info, "disk space caching is enabled"); + if (!ret && btrfs_test_opt(root, FREE_SPACE_TREE)) + btrfs_info(root->fs_info, "using free space tree"); kfree(orig); return ret; } @@ -1155,6 +1188,8 @@ static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) seq_puts(seq, ",noacl"); if (btrfs_test_opt(root, SPACE_CACHE)) seq_puts(seq, ",space_cache"); + else if (btrfs_test_opt(root, FREE_SPACE_TREE)) + seq_puts(seq, ",space_cache=v2"); else seq_puts(seq, ",nospace_cache"); if (btrfs_test_opt(root, RESCAN_UUID_TREE))