Merge branch 'freespace-4.5' into for-linus-4.5 (f0f76413) · Commits · e / devices / android_kernel_oneplus_sm7250

fs/btrfs/Makefile

+3 −2

Original line number	Diff line number	Diff line
		@@ -9,11 +9,12 @@ btrfs-y += super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \
		export.o tree-log.o free-space-cache.o zlib.o lzo.o \
		compression.o delayed-ref.o relocation.o delayed-inode.o scrub.o \
		reada.o backref.o ulist.o qgroup.o send.o dev-replace.o raid56.o \
		uuid-tree.o props.o hash.o
		uuid-tree.o props.o hash.o free-space-tree.o

		btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o
		btrfs-$(CONFIG_BTRFS_FS_CHECK_INTEGRITY) += check-integrity.o

		btrfs-$(CONFIG_BTRFS_FS_RUN_SANITY_TESTS) += tests/free-space-tests.o \
		tests/extent-buffer-tests.o tests/btrfs-tests.o \
		tests/extent-io-tests.o tests/inode-tests.o tests/qgroup-tests.o
		tests/extent-io-tests.o tests/inode-tests.o tests/qgroup-tests.o \
		tests/free-space-tree-tests.o

fs/btrfs/ctree.h

+155 −2

Original line number	Diff line number	Diff line
		@@ -96,6 +96,9 @@ struct btrfs_ordered_sum;
		/* for storing items that use the BTRFS_UUID_KEY* types */
		#define BTRFS_UUID_TREE_OBJECTID 9ULL

		/* tracks free space in block groups. */
		#define BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL

		/* for storing balance parameters in the root tree */
		#define BTRFS_BALANCE_OBJECTID -4ULL

		@@ -500,6 +503,8 @@ struct btrfs_super_block {
		* Compat flags that we support. If any incompat flags are set other than the
		* ones specified below then we will fail to mount
		*/
		#define BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE (1ULL << 0)

		#define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
		#define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1)
		#define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2)
		@@ -526,7 +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

		@@ -1088,6 +1096,13 @@ struct btrfs_block_group_item {
		__le64 flags;
		} __attribute__ ((__packed__));

		struct btrfs_free_space_info {
		__le32 extent_count;
		__le32 flags;
		} __attribute__ ((__packed__));

		#define BTRFS_FREE_SPACE_USING_BITMAPS (1ULL << 0)

		#define BTRFS_QGROUP_LEVEL_SHIFT 48
		static inline u64 btrfs_qgroup_level(u64 qgroupid)
		{
		@@ -1296,6 +1311,9 @@ struct btrfs_caching_control {
		atomic_t count;
		};

		/* Once caching_thread() finds this much free space, it will wake up waiters. */
		#define CACHING_CTL_WAKE_UP (1024 * 1024 * 2)

		struct btrfs_io_ctl {
		void cur, orig;
		struct page *page;
		@@ -1321,8 +1339,20 @@ struct btrfs_block_group_cache {
		u64 delalloc_bytes;
		u64 bytes_super;
		u64 flags;
		u64 sectorsize;
		u64 cache_generation;
		u32 sectorsize;

		/*
		* If the free space extent count exceeds this number, convert the block
		* group to bitmaps.
		*/
		u32 bitmap_high_thresh;

		/*
		* If the free space extent count drops below this number, convert the
		* block group back to extents.
		*/
		u32 bitmap_low_thresh;

		/*
		* It is just used for the delayed data space allocation because
		@@ -1378,6 +1408,15 @@ struct btrfs_block_group_cache {
		struct list_head io_list;

		struct btrfs_io_ctl io_ctl;

		/* Lock for free space tree operations. */
		struct mutex free_space_lock;

		/*
		* Does the block group need to be added to the free space tree?
		* Protected by free_space_lock.
		*/
		int needs_free_space;
		};

		/* delayed seq elem */
		@@ -1429,6 +1468,7 @@ struct btrfs_fs_info {
		struct btrfs_root *csum_root;
		struct btrfs_root *quota_root;
		struct btrfs_root *uuid_root;
		struct btrfs_root *free_space_root;

		/* the log root tree is a directory of all the other log roots */
		struct btrfs_root *log_root_tree;
		@@ -2092,6 +2132,27 @@ struct btrfs_ioctl_defrag_range_args {
		*/
		#define BTRFS_BLOCK_GROUP_ITEM_KEY 192

		/*
		* Every block group is represented in the free space tree by a free space info
		* item, which stores some accounting information. It is keyed on
		* (block_group_start, FREE_SPACE_INFO, block_group_length).
		*/
		#define BTRFS_FREE_SPACE_INFO_KEY 198

		/*
		* A free space extent tracks an extent of space that is free in a block group.
		* It is keyed on (start, FREE_SPACE_EXTENT, length).
		*/
		#define BTRFS_FREE_SPACE_EXTENT_KEY 199

		/*
		* When a block group becomes very fragmented, we convert it to use bitmaps
		* instead of extents. A free space bitmap is keyed on
		* (start, FREE_SPACE_BITMAP, length); the corresponding item is a bitmap with
		* (length / sectorsize) bits.
		*/
		#define BTRFS_FREE_SPACE_BITMAP_KEY 200

		#define BTRFS_DEV_EXTENT_KEY 204
		#define BTRFS_DEV_ITEM_KEY 216
		#define BTRFS_CHUNK_ITEM_KEY 228
		@@ -2184,6 +2245,7 @@ struct btrfs_ioctl_defrag_range_args {
		#define BTRFS_MOUNT_RESCAN_UUID_TREE (1 << 23)
		#define BTRFS_MOUNT_FRAGMENT_DATA (1 << 24)
		#define BTRFS_MOUNT_FRAGMENT_METADATA (1 << 25)
		#define BTRFS_MOUNT_FREE_SPACE_TREE (1 << 26)

		#define BTRFS_DEFAULT_COMMIT_INTERVAL (30)
		#define BTRFS_DEFAULT_MAX_INLINE (8192)
		@@ -2506,6 +2568,11 @@ BTRFS_SETGET_FUNCS(disk_block_group_flags,
		BTRFS_SETGET_STACK_FUNCS(block_group_flags,
		struct btrfs_block_group_item, flags, 64);

		/* struct btrfs_free_space_info */
		BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
		extent_count, 32);
		BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);

		/* struct btrfs_inode_ref */
		BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
		BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
		@@ -3573,6 +3640,9 @@ void btrfs_end_write_no_snapshoting(struct btrfs_root *root);
		void check_system_chunk(struct btrfs_trans_handle *trans,
		struct btrfs_root *root,
		const u64 type);
		u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
		struct btrfs_fs_info *info, u64 start, u64 end);

		/* ctree.c */
		int btrfs_bin_search(struct extent_buffer eb, struct btrfs_key key,
		int level, int *slot);
		@@ -3737,6 +3807,7 @@ 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);
		@@ -4246,6 +4317,30 @@ static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
		}
		}

		#define btrfs_clear_fs_incompat(__fs_info, opt) \
		__btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)

		static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
		u64 flag)
		{
		struct btrfs_super_block *disk_super;
		u64 features;

		disk_super = fs_info->super_copy;
		features = btrfs_super_incompat_flags(disk_super);
		if (features & flag) {
		spin_lock(&fs_info->super_lock);
		features = btrfs_super_incompat_flags(disk_super);
		if (features & flag) {
		features &= ~flag;
		btrfs_set_super_incompat_flags(disk_super, features);
		btrfs_info(fs_info, "clearing %llu feature flag",
		flag);
		}
		spin_unlock(&fs_info->super_lock);
		}
		}

		#define btrfs_fs_incompat(fs_info, opt) \
		__btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)

		@@ -4256,6 +4351,64 @@ static inline int __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
		return !!(btrfs_super_incompat_flags(disk_super) & flag);
		}

		#define btrfs_set_fs_compat_ro(__fs_info, opt) \
		__btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)

		static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
		u64 flag)
		{
		struct btrfs_super_block *disk_super;
		u64 features;

		disk_super = fs_info->super_copy;
		features = btrfs_super_compat_ro_flags(disk_super);
		if (!(features & flag)) {
		spin_lock(&fs_info->super_lock);
		features = btrfs_super_compat_ro_flags(disk_super);
		if (!(features & flag)) {
		features \|= flag;
		btrfs_set_super_compat_ro_flags(disk_super, features);
		btrfs_info(fs_info, "setting %llu ro feature flag",
		flag);
		}
		spin_unlock(&fs_info->super_lock);
		}
		}

		#define btrfs_clear_fs_compat_ro(__fs_info, opt) \
		__btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)

		static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
		u64 flag)
		{
		struct btrfs_super_block *disk_super;
		u64 features;

		disk_super = fs_info->super_copy;
		features = btrfs_super_compat_ro_flags(disk_super);
		if (features & flag) {
		spin_lock(&fs_info->super_lock);
		features = btrfs_super_compat_ro_flags(disk_super);
		if (features & flag) {
		features &= ~flag;
		btrfs_set_super_compat_ro_flags(disk_super, features);
		btrfs_info(fs_info, "clearing %llu ro feature flag",
		flag);
		}
		spin_unlock(&fs_info->super_lock);
		}
		}

		#define btrfs_fs_compat_ro(fs_info, opt) \
		__btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)

		static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
		{
		struct btrfs_super_block *disk_super;
		disk_super = fs_info->super_copy;
		return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
		}

		/*
		* Call btrfs_abort_transaction as early as possible when an error condition is
		* detected, that way the exact line number is reported.

fs/btrfs/disk-io.c

+38 −0

Original line number	Diff line number	Diff line
		@@ -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"
		@@ -1650,6 +1651,9 @@ 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) {
		@@ -2148,6 +2152,7 @@ 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)
		@@ -2448,6 +2453,15 @@ 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;
		}

		@@ -3076,6 +3090,30 @@ 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);

fs/btrfs/extent-tree.c

+71 −30

Original line number	Diff line number	Diff line
		@@ -33,6 +33,7 @@
		#include "raid56.h"
		#include "locking.h"
		#include "free-space-cache.h"
		#include "free-space-tree.h"
		#include "math.h"
		#include "sysfs.h"
		#include "qgroup.h"
		@@ -357,7 +358,7 @@ static void fragment_free_space(struct btrfs_root *root,
		* we need to check the pinned_extents for any extents that can't be used yet
		* since their free space will be released as soon as the transaction commits.
		*/
		static u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
		u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
		struct btrfs_fs_info *info, u64 start, u64 end)
		{
		u64 extent_start, extent_end, size, total_added = 0;
		@@ -395,11 +396,10 @@ static u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
		return total_added;
		}

		static noinline void caching_thread(struct btrfs_work *work)
		static int load_extent_tree_free(struct btrfs_caching_control *caching_ctl)
		{
		struct btrfs_block_group_cache *block_group;
		struct btrfs_fs_info *fs_info;
		struct btrfs_caching_control *caching_ctl;
		struct btrfs_root *extent_root;
		struct btrfs_path *path;
		struct extent_buffer *leaf;
		@@ -407,17 +407,16 @@ static noinline void caching_thread(struct btrfs_work *work)
		u64 total_found = 0;
		u64 last = 0;
		u32 nritems;
		int ret = -ENOMEM;
		int ret;
		bool wakeup = true;

		caching_ctl = container_of(work, struct btrfs_caching_control, work);
		block_group = caching_ctl->block_group;
		fs_info = block_group->fs_info;
		extent_root = fs_info->extent_root;

		path = btrfs_alloc_path();
		if (!path)
		goto out;
		return -ENOMEM;

		last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET);

		@@ -443,15 +442,11 @@ static noinline void caching_thread(struct btrfs_work *work)
		key.objectid = last;
		key.offset = 0;
		key.type = BTRFS_EXTENT_ITEM_KEY;
		again:
		mutex_lock(&caching_ctl->mutex);
		/* need to make sure the commit_root doesn't disappear */
		down_read(&fs_info->commit_root_sem);

		next:
		ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
		if (ret < 0)
		goto err;
		goto out;

		leaf = path->nodes[0];
		nritems = btrfs_header_nritems(leaf);
		@@ -477,12 +472,14 @@ static noinline void caching_thread(struct btrfs_work *work)
		up_read(&fs_info->commit_root_sem);
		mutex_unlock(&caching_ctl->mutex);
		cond_resched();
		goto again;
		mutex_lock(&caching_ctl->mutex);
		down_read(&fs_info->commit_root_sem);
		goto next;
		}

		ret = btrfs_next_leaf(extent_root, path);
		if (ret < 0)
		goto err;
		goto out;
		if (ret)
		break;
		leaf = path->nodes[0];
		@@ -521,7 +518,7 @@ static noinline void caching_thread(struct btrfs_work *work)
		else
		last = key.objectid + key.offset;

		if (total_found > (1024 * 1024 * 2)) {
		if (total_found > CACHING_CTL_WAKE_UP) {
		total_found = 0;
		if (wakeup)
		wake_up(&caching_ctl->wait);
		@@ -534,9 +531,35 @@ static noinline void caching_thread(struct btrfs_work *work)
		total_found += add_new_free_space(block_group, fs_info, last,
		block_group->key.objectid +
		block_group->key.offset);
		caching_ctl->progress = (u64)-1;

		out:
		btrfs_free_path(path);
		return ret;
		}

		static noinline void caching_thread(struct btrfs_work *work)
		{
		struct btrfs_block_group_cache *block_group;
		struct btrfs_fs_info *fs_info;
		struct btrfs_caching_control *caching_ctl;
		int ret;

		caching_ctl = container_of(work, struct btrfs_caching_control, work);
		block_group = caching_ctl->block_group;
		fs_info = block_group->fs_info;

		mutex_lock(&caching_ctl->mutex);
		down_read(&fs_info->commit_root_sem);

		if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE))
		ret = load_free_space_tree(caching_ctl);
		else
		ret = load_extent_tree_free(caching_ctl);

		spin_lock(&block_group->lock);
		block_group->caching_ctl = NULL;
		block_group->cached = BTRFS_CACHE_FINISHED;
		block_group->cached = ret ? BTRFS_CACHE_ERROR : BTRFS_CACHE_FINISHED;
		spin_unlock(&block_group->lock);

		#ifdef CONFIG_BTRFS_DEBUG
		@@ -555,20 +578,11 @@ static noinline void caching_thread(struct btrfs_work *work)
		#endif

		caching_ctl->progress = (u64)-1;
		err:
		btrfs_free_path(path);
		up_read(&fs_info->commit_root_sem);

		free_excluded_extents(extent_root, block_group);

		up_read(&fs_info->commit_root_sem);
		free_excluded_extents(fs_info->extent_root, block_group);
		mutex_unlock(&caching_ctl->mutex);
		out:
		if (ret) {
		spin_lock(&block_group->lock);
		block_group->caching_ctl = NULL;
		block_group->cached = BTRFS_CACHE_ERROR;
		spin_unlock(&block_group->lock);
		}

		wake_up(&caching_ctl->wait);

		put_caching_control(caching_ctl);
		@@ -680,8 +694,8 @@ static int cache_block_group(struct btrfs_block_group_cache *cache,
		}
		} else {
		/*
		* We are not going to do the fast caching, set cached to the
		* appropriate value and wakeup any waiters.
		* We're either using the free space tree or no caching at all.
		* Set cached to the appropriate value and wakeup any waiters.
		*/
		spin_lock(&cache->lock);
		if (load_cache_only) {
		@@ -6676,6 +6690,13 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
		}
		}

		ret = add_to_free_space_tree(trans, root->fs_info, bytenr,
		num_bytes);
		if (ret) {
		btrfs_abort_transaction(trans, extent_root, ret);
		goto out;
		}

		ret = update_block_group(trans, root, bytenr, num_bytes, 0);
		if (ret) {
		btrfs_abort_transaction(trans, extent_root, ret);
		@@ -7687,6 +7708,11 @@ static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
		btrfs_mark_buffer_dirty(path->nodes[0]);
		btrfs_free_path(path);

		ret = remove_from_free_space_tree(trans, fs_info, ins->objectid,
		ins->offset);
		if (ret)
		return ret;

		ret = update_block_group(trans, root, ins->objectid, ins->offset, 1);
		if (ret) { /* -ENOENT, logic error */
		btrfs_err(fs_info, "update block group failed for %llu %llu",
		@@ -7767,6 +7793,11 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
		btrfs_mark_buffer_dirty(leaf);
		btrfs_free_path(path);

		ret = remove_from_free_space_tree(trans, fs_info, ins->objectid,
		num_bytes);
		if (ret)
		return ret;

		ret = update_block_group(trans, root, ins->objectid, root->nodesize,
		1);
		if (ret) { /* -ENOENT, logic error */
		@@ -9671,6 +9702,8 @@ btrfs_create_block_group_cache(struct btrfs_root *root, u64 start, u64 size)
		cache->full_stripe_len = btrfs_full_stripe_len(root,
		&root->fs_info->mapping_tree,
		start);
		set_free_space_tree_thresholds(cache);

		atomic_set(&cache->count, 1);
		spin_lock_init(&cache->lock);
		init_rwsem(&cache->data_rwsem);
		@@ -9682,6 +9715,7 @@ btrfs_create_block_group_cache(struct btrfs_root *root, u64 start, u64 size)
		INIT_LIST_HEAD(&cache->io_list);
		btrfs_init_free_space_ctl(cache);
		atomic_set(&cache->trimming, 0);
		mutex_init(&cache->free_space_lock);

		return cache;
		}
		@@ -9892,6 +9926,8 @@ void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans,
		key.objectid, key.offset);
		if (ret)
		btrfs_abort_transaction(trans, extent_root, ret);
		add_block_group_free_space(trans, root->fs_info, block_group);
		/* already aborted the transaction if it failed. */
		next:
		list_del_init(&block_group->bg_list);
		}
		@@ -9922,6 +9958,7 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans,
		cache->flags = type;
		cache->last_byte_to_unpin = (u64)-1;
		cache->cached = BTRFS_CACHE_FINISHED;
		cache->needs_free_space = 1;
		ret = exclude_super_stripes(root, cache);
		if (ret) {
		/*
		@@ -10292,6 +10329,10 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans,

		unlock_chunks(root);

		ret = remove_block_group_free_space(trans, root->fs_info, block_group);
		if (ret)
		goto out;

		btrfs_put_block_group(block_group);
		btrfs_put_block_group(block_group);

fs/btrfs/extent_io.c

+170 −13

Original line number	Diff line number	Diff line
		@@ -4702,24 +4702,14 @@ struct extent_buffer btrfs_clone_extent_buffer(struct extent_buffer src)
		return new;
		}

		struct extent_buffer alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
		u64 start)
		struct extent_buffer __alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
		u64 start, unsigned long len)
		{
		struct extent_buffer *eb;
		unsigned long len;
		unsigned long num_pages;
		unsigned long i;

		if (!fs_info) {
		/*
		* Called only from tests that don't always have a fs_info
		* available, but we know that nodesize is 4096
		*/
		len = 4096;
		} else {
		len = fs_info->tree_root->nodesize;
		}
		num_pages = num_extent_pages(0, len);
		num_pages = num_extent_pages(start, len);

		eb = __alloc_extent_buffer(fs_info, start, len);
		if (!eb)
		@@ -4742,6 +4732,24 @@ struct extent_buffer alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
		return NULL;
		}

		struct extent_buffer alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
		u64 start)
		{
		unsigned long len;

		if (!fs_info) {
		/*
		* Called only from tests that don't always have a fs_info
		* available, but we know that nodesize is 4096
		*/
		len = 4096;
		} else {
		len = fs_info->tree_root->nodesize;
		}

		return __alloc_dummy_extent_buffer(fs_info, start, len);
		}

		static void check_buffer_tree_ref(struct extent_buffer *eb)
		{
		int refs;
		@@ -5497,6 +5505,155 @@ void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
		}
		}

		/*
		* The extent buffer bitmap operations are done with byte granularity because
		* bitmap items are not guaranteed to be aligned to a word and therefore a
		* single word in a bitmap may straddle two pages in the extent buffer.
		*/
		#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
		#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
		#define BITMAP_FIRST_BYTE_MASK(start) \
		((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
		#define BITMAP_LAST_BYTE_MASK(nbits) \
		(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))

		/*
		* eb_bitmap_offset() - calculate the page and offset of the byte containing the
		* given bit number
		* @eb: the extent buffer
		* @start: offset of the bitmap item in the extent buffer
		* @nr: bit number
		* @page_index: return index of the page in the extent buffer that contains the
		* given bit number
		* @page_offset: return offset into the page given by page_index
		*
		* This helper hides the ugliness of finding the byte in an extent buffer which
		* contains a given bit.
		*/
		static inline void eb_bitmap_offset(struct extent_buffer *eb,
		unsigned long start, unsigned long nr,
		unsigned long *page_index,
		size_t *page_offset)
		{
		size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1);
		size_t byte_offset = BIT_BYTE(nr);
		size_t offset;

		/*
		* The byte we want is the offset of the extent buffer + the offset of
		* the bitmap item in the extent buffer + the offset of the byte in the
		* bitmap item.
		*/
		offset = start_offset + start + byte_offset;

		*page_index = offset >> PAGE_CACHE_SHIFT;
		*page_offset = offset & (PAGE_CACHE_SIZE - 1);
		}

		/**
		* extent_buffer_test_bit - determine whether a bit in a bitmap item is set
		* @eb: the extent buffer
		* @start: offset of the bitmap item in the extent buffer
		* @nr: bit number to test
		*/
		int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
		unsigned long nr)
		{
		char *kaddr;
		struct page *page;
		unsigned long i;
		size_t offset;

		eb_bitmap_offset(eb, start, nr, &i, &offset);
		page = eb->pages[i];
		WARN_ON(!PageUptodate(page));
		kaddr = page_address(page);
		return 1U & (kaddr[offset] >> (nr & (BITS_PER_BYTE - 1)));
		}

		/**
		* extent_buffer_bitmap_set - set an area of a bitmap
		* @eb: the extent buffer
		* @start: offset of the bitmap item in the extent buffer
		* @pos: bit number of the first bit
		* @len: number of bits to set
		*/
		void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
		unsigned long pos, unsigned long len)
		{
		char *kaddr;
		struct page *page;
		unsigned long i;
		size_t offset;
		const unsigned int size = pos + len;
		int bits_to_set = BITS_PER_BYTE - (pos % BITS_PER_BYTE);
		unsigned int mask_to_set = BITMAP_FIRST_BYTE_MASK(pos);

		eb_bitmap_offset(eb, start, pos, &i, &offset);
		page = eb->pages[i];
		WARN_ON(!PageUptodate(page));
		kaddr = page_address(page);

		while (len >= bits_to_set) {
		kaddr[offset] \|= mask_to_set;
		len -= bits_to_set;
		bits_to_set = BITS_PER_BYTE;
		mask_to_set = ~0U;
		if (++offset >= PAGE_CACHE_SIZE && len > 0) {
		offset = 0;
		page = eb->pages[++i];
		WARN_ON(!PageUptodate(page));
		kaddr = page_address(page);
		}
		}
		if (len) {
		mask_to_set &= BITMAP_LAST_BYTE_MASK(size);
		kaddr[offset] \|= mask_to_set;
		}
		}


		/**
		* extent_buffer_bitmap_clear - clear an area of a bitmap
		* @eb: the extent buffer
		* @start: offset of the bitmap item in the extent buffer
		* @pos: bit number of the first bit
		* @len: number of bits to clear
		*/
		void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
		unsigned long pos, unsigned long len)
		{
		char *kaddr;
		struct page *page;
		unsigned long i;
		size_t offset;
		const unsigned int size = pos + len;
		int bits_to_clear = BITS_PER_BYTE - (pos % BITS_PER_BYTE);
		unsigned int mask_to_clear = BITMAP_FIRST_BYTE_MASK(pos);

		eb_bitmap_offset(eb, start, pos, &i, &offset);
		page = eb->pages[i];
		WARN_ON(!PageUptodate(page));
		kaddr = page_address(page);

		while (len >= bits_to_clear) {
		kaddr[offset] &= ~mask_to_clear;
		len -= bits_to_clear;
		bits_to_clear = BITS_PER_BYTE;
		mask_to_clear = ~0U;
		if (++offset >= PAGE_CACHE_SIZE && len > 0) {
		offset = 0;
		page = eb->pages[++i];
		WARN_ON(!PageUptodate(page));
		kaddr = page_address(page);
		}
		}
		if (len) {
		mask_to_clear &= BITMAP_LAST_BYTE_MASK(size);
		kaddr[offset] &= ~mask_to_clear;
		}
		}

		static inline bool areas_overlap(unsigned long src, unsigned long dst, unsigned long len)
		{
		unsigned long distance = (src > dst) ? src - dst : dst - src;