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Commit f7d3d2f9 authored by Chris Mason's avatar Chris Mason
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Merge branch 'freespace-tree' into for-linus-4.5 

Signed-off-by: default avatarChris Mason <clm@fb.com>
parents 9f9499ae 70f6d82e
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Showing with 2934 additions and 113 deletions
fs/btrfs/Makefile
View file @ f7d3d2f9
......@@ -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
View file @ f7d3d2f9
......@@ -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);
......@@ -4247,6 +4318,30 @@ 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)
......@@ -4257,6 +4352,64 @@ 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
View file @ f7d3d2f9
......@@ -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
View file @ f7d3d2f9
......@@ -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"
......@@ -357,8 +358,8 @@ 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,
struct btrfs_fs_info *info, u64 start, u64 end)
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;
int ret;
......@@ -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) {
......@@ -6661,6 +6675,13 @@ 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);
......@@ -7672,6 +7693,11 @@ 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",
......@@ -7752,6 +7778,11 @@ 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 */
......@@ -9656,6 +9687,8 @@ 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);
......@@ -9667,6 +9700,7 @@ 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;
}
......@@ -9877,6 +9911,8 @@ 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);
}
......@@ -9907,6 +9943,7 @@ 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) {
/*
......@@ -10277,6 +10314,10 @@ 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
View file @ f7d3d2f9
......@@ -4797,24 +4797,14 @@ 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)
......@@ -4837,6 +4827,24 @@ 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;
......@@ -5594,6 +5602,155 @@ 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;
......
fs/btrfs/extent_io.h
View file @ f7d3d2f9
......@@ -282,8 +282,10 @@ void set_page_extent_mapped(struct page *page);
struct extent_buffer *alloc_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 *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
u64 start);
u64 start);
struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
u64 start);
......@@ -328,6 +330,12 @@ void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
unsigned long src_offset, unsigned long len);
void memset_extent_buffer(struct extent_buffer *eb, char c,
unsigned long start, unsigned long len);
int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
unsigned long pos);
void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
unsigned long pos, unsigned long len);
void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
unsigned long pos, unsigned long len);
void clear_extent_buffer_dirty(struct extent_buffer *eb);
int set_extent_buffer_dirty(struct extent_buffer *eb);
int set_extent_buffer_uptodate(struct extent_buffer *eb);
......
fs/btrfs/free-space-tree.c 0 → 100644
View file @ f7d3d2f9
/*
* Copyright (C) 2015 Facebook. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include <linux/kernel.h>
#include <linux/vmalloc.h>
#include "ctree.h"
#include "disk-io.h"
#include "locking.h"
#include "free-space-tree.h"
#include "transaction.h"
static int __add_block_group_free_space(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group,
struct btrfs_path *path);
void set_free_space_tree_thresholds(struct btrfs_block_group_cache *cache)
{
u32 bitmap_range;
size_t bitmap_size;
u64 num_bitmaps, total_bitmap_size;
/*
* We convert to bitmaps when the disk space required for using extents
* exceeds that required for using bitmaps.
*/
bitmap_range = cache->sectorsize * BTRFS_FREE_SPACE_BITMAP_BITS;
num_bitmaps = div_u64(cache->key.offset + bitmap_range - 1,
bitmap_range);
bitmap_size = sizeof(struct btrfs_item) + BTRFS_FREE_SPACE_BITMAP_SIZE;
total_bitmap_size = num_bitmaps * bitmap_size;
cache->bitmap_high_thresh = div_u64(total_bitmap_size,
sizeof(struct btrfs_item));
/*
* We allow for a small buffer between the high threshold and low
* threshold to avoid thrashing back and forth between the two formats.
*/
if (cache->bitmap_high_thresh > 100)
cache->bitmap_low_thresh = cache->bitmap_high_thresh - 100;
else
cache->bitmap_low_thresh = 0;
}
static int add_new_free_space_info(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group,
struct btrfs_path *path)
{
struct btrfs_root *root = fs_info->free_space_root;
struct btrfs_free_space_info *info;
struct btrfs_key key;
struct extent_buffer *leaf;
int ret;
key.objectid = block_group->key.objectid;
key.type = BTRFS_FREE_SPACE_INFO_KEY;
key.offset = block_group->key.offset;
ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*info));
if (ret)
goto out;
leaf = path->nodes[0];
info = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_free_space_info);
btrfs_set_free_space_extent_count(leaf, info, 0);
btrfs_set_free_space_flags(leaf, info, 0);
btrfs_mark_buffer_dirty(leaf);
ret = 0;
out:
btrfs_release_path(path);
return ret;
}
struct btrfs_free_space_info *
search_free_space_info(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group,
struct btrfs_path *path, int cow)
{
struct btrfs_root *root = fs_info->free_space_root;
struct btrfs_key key;
int ret;
key.objectid = block_group->key.objectid;
key.type = BTRFS_FREE_SPACE_INFO_KEY;
key.offset = block_group->key.offset;
ret = btrfs_search_slot(trans, root, &key, path, 0, cow);
if (ret < 0)
return ERR_PTR(ret);
if (ret != 0) {
btrfs_warn(fs_info, "missing free space info for %llu\n",
block_group->key.objectid);
ASSERT(0);
return ERR_PTR(-ENOENT);
}
return btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_free_space_info);
}
/*
* btrfs_search_slot() but we're looking for the greatest key less than the
* passed key.
*/
static int btrfs_search_prev_slot(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_key *key, struct btrfs_path *p,
int ins_len, int cow)
{
int ret;
ret = btrfs_search_slot(trans, root, key, p, ins_len, cow);
if (ret < 0)
return ret;
if (ret == 0) {
ASSERT(0);
return -EIO;
}
if (p->slots[0] == 0) {
ASSERT(0);
return -EIO;
}
p->slots[0]--;
return 0;
}
static inline u32 free_space_bitmap_size(u64 size, u32 sectorsize)
{
return DIV_ROUND_UP((u32)div_u64(size, sectorsize), BITS_PER_BYTE);
}
static unsigned long *alloc_bitmap(u32 bitmap_size)
{
return __vmalloc(bitmap_size, GFP_NOFS | __GFP_HIGHMEM | __GFP_ZERO,
PAGE_KERNEL);
}
int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group,
struct btrfs_path *path)
{
struct btrfs_root *root = fs_info->free_space_root;
struct btrfs_free_space_info *info;
struct btrfs_key key, found_key;
struct extent_buffer *leaf;
unsigned long *bitmap;
char *bitmap_cursor;
u64 start, end;
u64 bitmap_range, i;
u32 bitmap_size, flags, expected_extent_count;
u32 extent_count = 0;
int done = 0, nr;
int ret;
bitmap_size = free_space_bitmap_size(block_group->key.offset,
block_group->sectorsize);
bitmap = alloc_bitmap(bitmap_size);
if (!bitmap) {
ret = -ENOMEM;
goto out;
}
start = block_group->key.objectid;
end = block_group->key.objectid + block_group->key.offset;
key.objectid = end - 1;
key.type = (u8)-1;
key.offset = (u64)-1;
while (!done) {
ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1);
if (ret)
goto out;
leaf = path->nodes[0];
nr = 0;
path->slots[0]++;
while (path->slots[0] > 0) {
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1);
if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) {
ASSERT(found_key.objectid == block_group->key.objectid);
ASSERT(found_key.offset == block_group->key.offset);
done = 1;
break;
} else if (found_key.type == BTRFS_FREE_SPACE_EXTENT_KEY) {
u64 first, last;
ASSERT(found_key.objectid >= start);
ASSERT(found_key.objectid < end);
ASSERT(found_key.objectid + found_key.offset <= end);
first = div_u64(found_key.objectid - start,
block_group->sectorsize);
last = div_u64(found_key.objectid + found_key.offset - start,
block_group->sectorsize);
bitmap_set(bitmap, first, last - first);
extent_count++;
nr++;
path->slots[0]--;
} else {
ASSERT(0);
}
}
ret = btrfs_del_items(trans, root, path, path->slots[0], nr);
if (ret)
goto out;
btrfs_release_path(path);
}
info = search_free_space_info(trans, fs_info, block_group, path, 1);
if (IS_ERR(info)) {
ret = PTR_ERR(info);
goto out;
}
leaf = path->nodes[0];
flags = btrfs_free_space_flags(leaf, info);
flags |= BTRFS_FREE_SPACE_USING_BITMAPS;
btrfs_set_free_space_flags(leaf, info, flags);
expected_extent_count = btrfs_free_space_extent_count(leaf, info);
btrfs_mark_buffer_dirty(leaf);
btrfs_release_path(path);
if (extent_count != expected_extent_count) {
btrfs_err(fs_info, "incorrect extent count for %llu; counted %u, expected %u",
block_group->key.objectid, extent_count,
expected_extent_count);
ASSERT(0);
ret = -EIO;
goto out;
}
bitmap_cursor = (char *)bitmap;
bitmap_range = block_group->sectorsize * BTRFS_FREE_SPACE_BITMAP_BITS;
i = start;
while (i < end) {
unsigned long ptr;
u64 extent_size;
u32 data_size;
extent_size = min(end - i, bitmap_range);
data_size = free_space_bitmap_size(extent_size,
block_group->sectorsize);
key.objectid = i;
key.type = BTRFS_FREE_SPACE_BITMAP_KEY;
key.offset = extent_size;
ret = btrfs_insert_empty_item(trans, root, path, &key,
data_size);
if (ret)
goto out;
leaf = path->nodes[0];
ptr = btrfs_item_ptr_offset(leaf, path->slots[0]);
write_extent_buffer(leaf, bitmap_cursor, ptr,
data_size);
btrfs_mark_buffer_dirty(leaf);
btrfs_release_path(path);
i += extent_size;
bitmap_cursor += data_size;
}
ret = 0;
out:
vfree(bitmap);
if (ret)
btrfs_abort_transaction(trans, root, ret);
return ret;
}
int convert_free_space_to_extents(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group,
struct btrfs_path *path)
{
struct btrfs_root *root = fs_info->free_space_root;
struct btrfs_free_space_info *info;
struct btrfs_key key, found_key;
struct extent_buffer *leaf;
unsigned long *bitmap;
u64 start, end;
/* Initialize to silence GCC. */
u64 extent_start = 0;
u64 offset;
u32 bitmap_size, flags, expected_extent_count;
int prev_bit = 0, bit, bitnr;
u32 extent_count = 0;
int done = 0, nr;
int ret;
bitmap_size = free_space_bitmap_size(block_group->key.offset,
block_group->sectorsize);
bitmap = alloc_bitmap(bitmap_size);
if (!bitmap) {
ret = -ENOMEM;
goto out;
}
start = block_group->key.objectid;
end = block_group->key.objectid + block_group->key.offset;
key.objectid = end - 1;
key.type = (u8)-1;
key.offset = (u64)-1;
while (!done) {
ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1);
if (ret)
goto out;
leaf = path->nodes[0];
nr = 0;
path->slots[0]++;
while (path->slots[0] > 0) {
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1);
if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) {
ASSERT(found_key.objectid == block_group->key.objectid);
ASSERT(found_key.offset == block_group->key.offset);
done = 1;
break;
} else if (found_key.type == BTRFS_FREE_SPACE_BITMAP_KEY) {
unsigned long ptr;
char *bitmap_cursor;
u32 bitmap_pos, data_size;
ASSERT(found_key.objectid >= start);
ASSERT(found_key.objectid < end);
ASSERT(found_key.objectid + found_key.offset <= end);
bitmap_pos = div_u64(found_key.objectid - start,
block_group->sectorsize *
BITS_PER_BYTE);
bitmap_cursor = ((char *)bitmap) + bitmap_pos;
data_size = free_space_bitmap_size(found_key.offset,
block_group->sectorsize);
ptr = btrfs_item_ptr_offset(leaf, path->slots[0] - 1);
read_extent_buffer(leaf, bitmap_cursor, ptr,
data_size);
nr++;
path->slots[0]--;
} else {
ASSERT(0);
}
}
ret = btrfs_del_items(trans, root, path, path->slots[0], nr);
if (ret)
goto out;
btrfs_release_path(path);
}
info = search_free_space_info(trans, fs_info, block_group, path, 1);
if (IS_ERR(info)) {
ret = PTR_ERR(info);
goto out;
}
leaf = path->nodes[0];
flags = btrfs_free_space_flags(leaf, info);
flags &= ~BTRFS_FREE_SPACE_USING_BITMAPS;
btrfs_set_free_space_flags(leaf, info, flags);
expected_extent_count = btrfs_free_space_extent_count(leaf, info);
btrfs_mark_buffer_dirty(leaf);
btrfs_release_path(path);
offset = start;
bitnr = 0;
while (offset < end) {
bit = !!test_bit(bitnr, bitmap);
if (prev_bit == 0 && bit == 1) {
extent_start = offset;
} else if (prev_bit == 1 && bit == 0) {
key.objectid = extent_start;
key.type = BTRFS_FREE_SPACE_EXTENT_KEY;
key.offset = offset - extent_start;
ret = btrfs_insert_empty_item(trans, root, path, &key, 0);
if (ret)
goto out;
btrfs_release_path(path);
extent_count++;
}
prev_bit = bit;
offset += block_group->sectorsize;
bitnr++;
}
if (prev_bit == 1) {
key.objectid = extent_start;
key.type = BTRFS_FREE_SPACE_EXTENT_KEY;
key.offset = end - extent_start;
ret = btrfs_insert_empty_item(trans, root, path, &key, 0);
if (ret)
goto out;
btrfs_release_path(path);
extent_count++;
}
if (extent_count != expected_extent_count) {
btrfs_err(fs_info, "incorrect extent count for %llu; counted %u, expected %u",
block_group->key.objectid, extent_count,
expected_extent_count);
ASSERT(0);
ret = -EIO;
goto out;
}
ret = 0;
out:
vfree(bitmap);
if (ret)
btrfs_abort_transaction(trans, root, ret);
return ret;
}
static int update_free_space_extent_count(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group,
struct btrfs_path *path,
int new_extents)
{
struct btrfs_free_space_info *info;
u32 flags;
u32 extent_count;
int ret = 0;
if (new_extents == 0)
return 0;
info = search_free_space_info(trans, fs_info, block_group, path, 1);
if (IS_ERR(info)) {
ret = PTR_ERR(info);
goto out;
}
flags = btrfs_free_space_flags(path->nodes[0], info);
extent_count = btrfs_free_space_extent_count(path->nodes[0], info);
extent_count += new_extents;
btrfs_set_free_space_extent_count(path->nodes[0], info, extent_count);
btrfs_mark_buffer_dirty(path->nodes[0]);
btrfs_release_path(path);
if (!(flags & BTRFS_FREE_SPACE_USING_BITMAPS) &&
extent_count > block_group->bitmap_high_thresh) {
ret = convert_free_space_to_bitmaps(trans, fs_info, block_group,
path);
} else if ((flags & BTRFS_FREE_SPACE_USING_BITMAPS) &&
extent_count < block_group->bitmap_low_thresh) {
ret = convert_free_space_to_extents(trans, fs_info, block_group,
path);
}
out:
return ret;
}
int free_space_test_bit(struct btrfs_block_group_cache *block_group,
struct btrfs_path *path, u64 offset)
{
struct extent_buffer *leaf;
struct btrfs_key key;
u64 found_start, found_end;
unsigned long ptr, i;
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY);
found_start = key.objectid;
found_end = key.objectid + key.offset;
ASSERT(offset >= found_start && offset < found_end);
ptr = btrfs_item_ptr_offset(leaf, path->slots[0]);
i = div_u64(offset - found_start, block_group->sectorsize);
return !!extent_buffer_test_bit(leaf, ptr, i);
}
static void free_space_set_bits(struct btrfs_block_group_cache *block_group,
struct btrfs_path *path, u64 *start, u64 *size,
int bit)
{
struct extent_buffer *leaf;
struct btrfs_key key;
u64 end = *start + *size;
u64 found_start, found_end;
unsigned long ptr, first, last;
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY);
found_start = key.objectid;
found_end = key.objectid + key.offset;
ASSERT(*start >= found_start && *start < found_end);
ASSERT(end > found_start);
if (end > found_end)
end = found_end;
ptr = btrfs_item_ptr_offset(leaf, path->slots[0]);
first = div_u64(*start - found_start, block_group->sectorsize);
last = div_u64(end - found_start, block_group->sectorsize);
if (bit)
extent_buffer_bitmap_set(leaf, ptr, first, last - first);
else
extent_buffer_bitmap_clear(leaf, ptr, first, last - first);
btrfs_mark_buffer_dirty(leaf);
*size -= end - *start;
*start = end;
}
/*
* We can't use btrfs_next_item() in modify_free_space_bitmap() because
* btrfs_next_leaf() doesn't get the path for writing. We can forgo the fancy
* tree walking in btrfs_next_leaf() anyways because we know exactly what we're
* looking for.
*/
static int free_space_next_bitmap(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct btrfs_path *p)
{
struct btrfs_key key;
if (p->slots[0] + 1 < btrfs_header_nritems(p->nodes[0])) {
p->slots[0]++;
return 0;
}
btrfs_item_key_to_cpu(p->nodes[0], &key, p->slots[0]);
btrfs_release_path(p);
key.objectid += key.offset;
key.type = (u8)-1;
key.offset = (u64)-1;
return btrfs_search_prev_slot(trans, root, &key, p, 0, 1);
}
/*
* If remove is 1, then we are removing free space, thus clearing bits in the
* bitmap. If remove is 0, then we are adding free space, thus setting bits in
* the bitmap.
*/
static int modify_free_space_bitmap(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group,
struct btrfs_path *path,
u64 start, u64 size, int remove)
{
struct btrfs_root *root = fs_info->free_space_root;
struct btrfs_key key;
u64 end = start + size;
u64 cur_start, cur_size;
int prev_bit, next_bit;
int new_extents;
int ret;
/*
* Read the bit for the block immediately before the extent of space if
* that block is within the block group.
*/
if (start > block_group->key.objectid) {
u64 prev_block = start - block_group->sectorsize;
key.objectid = prev_block;
key.type = (u8)-1;
key.offset = (u64)-1;
ret = btrfs_search_prev_slot(trans, root, &key, path, 0, 1);
if (ret)
goto out;
prev_bit = free_space_test_bit(block_group, path, prev_block);
/* The previous block may have been in the previous bitmap. */
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
if (start >= key.objectid + key.offset) {
ret = free_space_next_bitmap(trans, root, path);
if (ret)
goto out;
}
} else {
key.objectid = start;
key.type = (u8)-1;
key.offset = (u64)-1;
ret = btrfs_search_prev_slot(trans, root, &key, path, 0, 1);
if (ret)
goto out;
prev_bit = -1;
}
/*
* Iterate over all of the bitmaps overlapped by the extent of space,
* clearing/setting bits as required.
*/
cur_start = start;
cur_size = size;
while (1) {
free_space_set_bits(block_group, path, &cur_start, &cur_size,
!remove);
if (cur_size == 0)
break;
ret = free_space_next_bitmap(trans, root, path);
if (ret)
goto out;
}
/*
* Read the bit for the block immediately after the extent of space if
* that block is within the block group.
*/
if (end < block_group->key.objectid + block_group->key.offset) {
/* The next block may be in the next bitmap. */
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
if (end >= key.objectid + key.offset) {
ret = free_space_next_bitmap(trans, root, path);
if (ret)
goto out;
}
next_bit = free_space_test_bit(block_group, path, end);
} else {
next_bit = -1;
}
if (remove) {
new_extents = -1;
if (prev_bit == 1) {
/* Leftover on the left. */
new_extents++;
}
if (next_bit == 1) {
/* Leftover on the right. */
new_extents++;
}
} else {
new_extents = 1;
if (prev_bit == 1) {
/* Merging with neighbor on the left. */
new_extents--;
}
if (next_bit == 1) {
/* Merging with neighbor on the right. */
new_extents--;
}
}
btrfs_release_path(path);
ret = update_free_space_extent_count(trans, fs_info, block_group, path,
new_extents);
out:
return ret;
}
static int remove_free_space_extent(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group,
struct btrfs_path *path,
u64 start, u64 size)
{
struct btrfs_root *root = fs_info->free_space_root;
struct btrfs_key key;
u64 found_start, found_end;
u64 end = start + size;
int new_extents = -1;
int ret;
key.objectid = start;
key.type = (u8)-1;
key.offset = (u64)-1;
ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1);
if (ret)
goto out;
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
ASSERT(key.type == BTRFS_FREE_SPACE_EXTENT_KEY);
found_start = key.objectid;
found_end = key.objectid + key.offset;
ASSERT(start >= found_start && end <= found_end);
/*
* Okay, now that we've found the free space extent which contains the
* free space that we are removing, there are four cases:
*
* 1. We're using the whole extent: delete the key we found and
* decrement the free space extent count.
* 2. We are using part of the extent starting at the beginning: delete
* the key we found and insert a new key representing the leftover at
* the end. There is no net change in the number of extents.
* 3. We are using part of the extent ending at the end: delete the key
* we found and insert a new key representing the leftover at the
* beginning. There is no net change in the number of extents.
* 4. We are using part of the extent in the middle: delete the key we
* found and insert two new keys representing the leftovers on each
* side. Where we used to have one extent, we now have two, so increment
* the extent count. We may need to convert the block group to bitmaps
* as a result.
*/
/* Delete the existing key (cases 1-4). */
ret = btrfs_del_item(trans, root, path);
if (ret)
goto out;
/* Add a key for leftovers at the beginning (cases 3 and 4). */
if (start > found_start) {
key.objectid = found_start;
key.type = BTRFS_FREE_SPACE_EXTENT_KEY;
key.offset = start - found_start;
btrfs_release_path(path);
ret = btrfs_insert_empty_item(trans, root, path, &key, 0);
if (ret)
goto out;
new_extents++;
}
/* Add a key for leftovers at the end (cases 2 and 4). */
if (end < found_end) {
key.objectid = end;
key.type = BTRFS_FREE_SPACE_EXTENT_KEY;
key.offset = found_end - end;
btrfs_release_path(path);
ret = btrfs_insert_empty_item(trans, root, path, &key, 0);
if (ret)
goto out;
new_extents++;
}
btrfs_release_path(path);
ret = update_free_space_extent_count(trans, fs_info, block_group, path,
new_extents);
out:
return ret;
}
int __remove_from_free_space_tree(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group,
struct btrfs_path *path, u64 start, u64 size)
{
struct btrfs_free_space_info *info;
u32 flags;
int ret;
if (block_group->needs_free_space) {
ret = __add_block_group_free_space(trans, fs_info, block_group,
path);
if (ret)
return ret;
}
info = search_free_space_info(NULL, fs_info, block_group, path, 0);
if (IS_ERR(info))
return PTR_ERR(info);
flags = btrfs_free_space_flags(path->nodes[0], info);
btrfs_release_path(path);
if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) {
return modify_free_space_bitmap(trans, fs_info, block_group,
path, start, size, 1);
} else {
return remove_free_space_extent(trans, fs_info, block_group,
path, start, size);
}
}
int remove_from_free_space_tree(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
u64 start, u64 size)
{
struct btrfs_block_group_cache *block_group;
struct btrfs_path *path;
int ret;
if (!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE))
return 0;
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto out;
}
block_group = btrfs_lookup_block_group(fs_info, start);
if (!block_group) {
ASSERT(0);
ret = -ENOENT;
goto out;
}
mutex_lock(&block_group->free_space_lock);
ret = __remove_from_free_space_tree(trans, fs_info, block_group, path,
start, size);
mutex_unlock(&block_group->free_space_lock);
btrfs_put_block_group(block_group);
out:
btrfs_free_path(path);
if (ret)
btrfs_abort_transaction(trans, fs_info->free_space_root, ret);
return ret;
}
static int add_free_space_extent(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group,
struct btrfs_path *path,
u64 start, u64 size)
{
struct btrfs_root *root = fs_info->free_space_root;
struct btrfs_key key, new_key;
u64 found_start, found_end;
u64 end = start + size;
int new_extents = 1;
int ret;
/*
* We are adding a new extent of free space, but we need to merge
* extents. There are four cases here:
*
* 1. The new extent does not have any immediate neighbors to merge
* with: add the new key and increment the free space extent count. We
* may need to convert the block group to bitmaps as a result.
* 2. The new extent has an immediate neighbor before it: remove the
* previous key and insert a new key combining both of them. There is no
* net change in the number of extents.
* 3. The new extent has an immediate neighbor after it: remove the next
* key and insert a new key combining both of them. There is no net
* change in the number of extents.
* 4. The new extent has immediate neighbors on both sides: remove both
* of the keys and insert a new key combining all of them. Where we used
* to have two extents, we now have one, so decrement the extent count.
*/
new_key.objectid = start;
new_key.type = BTRFS_FREE_SPACE_EXTENT_KEY;
new_key.offset = size;
/* Search for a neighbor on the left. */
if (start == block_group->key.objectid)
goto right;
key.objectid = start - 1;
key.type = (u8)-1;
key.offset = (u64)-1;
ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1);
if (ret)
goto out;
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
if (key.type != BTRFS_FREE_SPACE_EXTENT_KEY) {
ASSERT(key.type == BTRFS_FREE_SPACE_INFO_KEY);
btrfs_release_path(path);
goto right;
}
found_start = key.objectid;
found_end = key.objectid + key.offset;
ASSERT(found_start >= block_group->key.objectid &&
found_end > block_group->key.objectid);
ASSERT(found_start < start && found_end <= start);
/*
* Delete the neighbor on the left and absorb it into the new key (cases
* 2 and 4).
*/
if (found_end == start) {
ret = btrfs_del_item(trans, root, path);
if (ret)
goto out;
new_key.objectid = found_start;
new_key.offset += key.offset;
new_extents--;
}
btrfs_release_path(path);
right:
/* Search for a neighbor on the right. */
if (end == block_group->key.objectid + block_group->key.offset)
goto insert;
key.objectid = end;
key.type = (u8)-1;
key.offset = (u64)-1;
ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1);
if (ret)
goto out;
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
if (key.type != BTRFS_FREE_SPACE_EXTENT_KEY) {
ASSERT(key.type == BTRFS_FREE_SPACE_INFO_KEY);
btrfs_release_path(path);
goto insert;
}
found_start = key.objectid;
found_end = key.objectid + key.offset;
ASSERT(found_start >= block_group->key.objectid &&
found_end > block_group->key.objectid);
ASSERT((found_start < start && found_end <= start) ||
(found_start >= end && found_end > end));
/*
* Delete the neighbor on the right and absorb it into the new key
* (cases 3 and 4).
*/
if (found_start == end) {
ret = btrfs_del_item(trans, root, path);
if (ret)
goto out;
new_key.offset += key.offset;
new_extents--;
}
btrfs_release_path(path);
insert:
/* Insert the new key (cases 1-4). */
ret = btrfs_insert_empty_item(trans, root, path, &new_key, 0);
if (ret)
goto out;
btrfs_release_path(path);
ret = update_free_space_extent_count(trans, fs_info, block_group, path,
new_extents);
out:
return ret;
}
int __add_to_free_space_tree(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group,
struct btrfs_path *path, u64 start, u64 size)
{
struct btrfs_free_space_info *info;
u32 flags;
int ret;
if (block_group->needs_free_space) {
ret = __add_block_group_free_space(trans, fs_info, block_group,
path);
if (ret)
return ret;
}
info = search_free_space_info(NULL, fs_info, block_group, path, 0);
if (IS_ERR(info))
return PTR_ERR(info);
flags = btrfs_free_space_flags(path->nodes[0], info);
btrfs_release_path(path);
if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) {
return modify_free_space_bitmap(trans, fs_info, block_group,
path, start, size, 0);
} else {
return add_free_space_extent(trans, fs_info, block_group, path,
start, size);
}
}
int add_to_free_space_tree(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
u64 start, u64 size)
{
struct btrfs_block_group_cache *block_group;
struct btrfs_path *path;
int ret;
if (!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE))
return 0;
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto out;
}
block_group = btrfs_lookup_block_group(fs_info, start);
if (!block_group) {
ASSERT(0);
ret = -ENOENT;
goto out;
}
mutex_lock(&block_group->free_space_lock);
ret = __add_to_free_space_tree(trans, fs_info, block_group, path, start,
size);
mutex_unlock(&block_group->free_space_lock);
btrfs_put_block_group(block_group);
out:
btrfs_free_path(path);
if (ret)
btrfs_abort_transaction(trans, fs_info->free_space_root, ret);
return ret;
}
/*
* Populate the free space tree by walking the extent tree. Operations on the
* extent tree that happen as a result of writes to the free space tree will go
* through the normal add/remove hooks.
*/
static int populate_free_space_tree(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group)
{
struct btrfs_root *extent_root = fs_info->extent_root;
struct btrfs_path *path, *path2;
struct btrfs_key key;
u64 start, end;
int ret;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
path->reada = 1;
path2 = btrfs_alloc_path();
if (!path2) {
btrfs_free_path(path);
return -ENOMEM;
}
ret = add_new_free_space_info(trans, fs_info, block_group, path2);
if (ret)
goto out;
/*
* Iterate through all of the extent and metadata items in this block
* group, adding the free space between them and the free space at the
* end. Note that EXTENT_ITEM and METADATA_ITEM are less than
* BLOCK_GROUP_ITEM, so an extent may precede the block group that it's
* contained in.
*/
key.objectid = block_group->key.objectid;
key.type = BTRFS_EXTENT_ITEM_KEY;
key.offset = 0;
ret = btrfs_search_slot_for_read(extent_root, &key, path, 1, 0);
if (ret < 0)
goto out;
ASSERT(ret == 0);
start = block_group->key.objectid;
end = block_group->key.objectid + block_group->key.offset;
while (1) {
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
if (key.type == BTRFS_EXTENT_ITEM_KEY ||
key.type == BTRFS_METADATA_ITEM_KEY) {
if (key.objectid >= end)
break;
if (start < key.objectid) {
ret = __add_to_free_space_tree(trans, fs_info,
block_group,
path2, start,
key.objectid -
start);
if (ret)
goto out;
}
start = key.objectid;
if (key.type == BTRFS_METADATA_ITEM_KEY)
start += fs_info->tree_root->nodesize;
else
start += key.offset;
} else if (key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) {
if (key.objectid != block_group->key.objectid)
break;
}
ret = btrfs_next_item(extent_root, path);
if (ret < 0)
goto out;
if (ret)
break;
}
if (start < end) {
ret = __add_to_free_space_tree(trans, fs_info, block_group,
path2, start, end - start);
if (ret)
goto out;
}
ret = 0;
out:
btrfs_free_path(path2);
btrfs_free_path(path);
return ret;
}
int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info)
{
struct btrfs_trans_handle *trans;
struct btrfs_root *tree_root = fs_info->tree_root;
struct btrfs_root *free_space_root;
struct btrfs_block_group_cache *block_group;
struct rb_node *node;
int ret;
trans = btrfs_start_transaction(tree_root, 0);
if (IS_ERR(trans))
return PTR_ERR(trans);
free_space_root = btrfs_create_tree(trans, fs_info,
BTRFS_FREE_SPACE_TREE_OBJECTID);
if (IS_ERR(free_space_root)) {
ret = PTR_ERR(free_space_root);
goto abort;
}
fs_info->free_space_root = free_space_root;
node = rb_first(&fs_info->block_group_cache_tree);
while (node) {
block_group = rb_entry(node, struct btrfs_block_group_cache,
cache_node);
ret = populate_free_space_tree(trans, fs_info, block_group);
if (ret)
goto abort;
node = rb_next(node);
}
btrfs_set_fs_compat_ro(fs_info, FREE_SPACE_TREE);
ret = btrfs_commit_transaction(trans, tree_root);
if (ret)
return ret;
return 0;
abort:
btrfs_abort_transaction(trans, tree_root, ret);
btrfs_end_transaction(trans, tree_root);
return ret;
}
static int clear_free_space_tree(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
struct btrfs_path *path;
struct btrfs_key key;
int nr;
int ret;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
path->leave_spinning = 1;
key.objectid = 0;
key.type = 0;
key.offset = 0;
while (1) {
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret < 0)
goto out;
nr = btrfs_header_nritems(path->nodes[0]);
if (!nr)
break;
path->slots[0] = 0;
ret = btrfs_del_items(trans, root, path, 0, nr);
if (ret)
goto out;
btrfs_release_path(path);
}
ret = 0;
out:
btrfs_free_path(path);
return ret;
}
int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info)
{
struct btrfs_trans_handle *trans;
struct btrfs_root *tree_root = fs_info->tree_root;
struct btrfs_root *free_space_root = fs_info->free_space_root;
int ret;
trans = btrfs_start_transaction(tree_root, 0);
if (IS_ERR(trans))
return PTR_ERR(trans);
btrfs_clear_fs_compat_ro(fs_info, FREE_SPACE_TREE);
fs_info->free_space_root = NULL;
ret = clear_free_space_tree(trans, free_space_root);
if (ret)
goto abort;
ret = btrfs_del_root(trans, tree_root, &free_space_root->root_key);
if (ret)
goto abort;
list_del(&free_space_root->dirty_list);
btrfs_tree_lock(free_space_root->node);
clean_tree_block(trans, tree_root->fs_info, free_space_root->node);
btrfs_tree_unlock(free_space_root->node);
btrfs_free_tree_block(trans, free_space_root, free_space_root->node,
0, 1);
free_extent_buffer(free_space_root->node);
free_extent_buffer(free_space_root->commit_root);
kfree(free_space_root);
ret = btrfs_commit_transaction(trans, tree_root);
if (ret)
return ret;
return 0;
abort:
btrfs_abort_transaction(trans, tree_root, ret);
btrfs_end_transaction(trans, tree_root);
return ret;
}
static int __add_block_group_free_space(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group,
struct btrfs_path *path)
{
u64 start, end;
int ret;
start = block_group->key.objectid;
end = block_group->key.objectid + block_group->key.offset;
block_group->needs_free_space = 0;
ret = add_new_free_space_info(trans, fs_info, block_group, path);
if (ret)
return ret;
return __add_to_free_space_tree(trans, fs_info, block_group, path,
block_group->key.objectid,
block_group->key.offset);
}
int add_block_group_free_space(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group)
{
struct btrfs_path *path = NULL;
int ret = 0;
if (!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE))
return 0;
mutex_lock(&block_group->free_space_lock);
if (!block_group->needs_free_space)
goto out;
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto out;
}
ret = __add_block_group_free_space(trans, fs_info, block_group, path);
out:
btrfs_free_path(path);
mutex_unlock(&block_group->free_space_lock);
if (ret)
btrfs_abort_transaction(trans, fs_info->free_space_root, ret);
return ret;
}
int remove_block_group_free_space(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group)
{
struct btrfs_root *root = fs_info->free_space_root;
struct btrfs_path *path;
struct btrfs_key key, found_key;
struct extent_buffer *leaf;
u64 start, end;
int done = 0, nr;
int ret;
if (!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE))
return 0;
if (block_group->needs_free_space) {
/* We never added this block group to the free space tree. */
return 0;
}
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto out;
}
start = block_group->key.objectid;
end = block_group->key.objectid + block_group->key.offset;
key.objectid = end - 1;
key.type = (u8)-1;
key.offset = (u64)-1;
while (!done) {
ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1);
if (ret)
goto out;
leaf = path->nodes[0];
nr = 0;
path->slots[0]++;
while (path->slots[0] > 0) {
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1);
if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) {
ASSERT(found_key.objectid == block_group->key.objectid);
ASSERT(found_key.offset == block_group->key.offset);
done = 1;
nr++;
path->slots[0]--;
break;
} else if (found_key.type == BTRFS_FREE_SPACE_EXTENT_KEY ||
found_key.type == BTRFS_FREE_SPACE_BITMAP_KEY) {
ASSERT(found_key.objectid >= start);
ASSERT(found_key.objectid < end);
ASSERT(found_key.objectid + found_key.offset <= end);
nr++;
path->slots[0]--;
} else {
ASSERT(0);
}
}
ret = btrfs_del_items(trans, root, path, path->slots[0], nr);
if (ret)
goto out;
btrfs_release_path(path);
}
ret = 0;
out:
btrfs_free_path(path);
if (ret)
btrfs_abort_transaction(trans, root, ret);
return ret;
}
static int load_free_space_bitmaps(struct btrfs_caching_control *caching_ctl,
struct btrfs_path *path,
u32 expected_extent_count)
{
struct btrfs_block_group_cache *block_group;
struct btrfs_fs_info *fs_info;
struct btrfs_root *root;
struct btrfs_key key;
int prev_bit = 0, bit;
/* Initialize to silence GCC. */
u64 extent_start = 0;
u64 end, offset;
u64 total_found = 0;
u32 extent_count = 0;
int ret;
block_group = caching_ctl->block_group;
fs_info = block_group->fs_info;
root = fs_info->free_space_root;
end = block_group->key.objectid + block_group->key.offset;
while (1) {
ret = btrfs_next_item(root, path);
if (ret < 0)
goto out;
if (ret)
break;
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
if (key.type == BTRFS_FREE_SPACE_INFO_KEY)
break;
ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY);
ASSERT(key.objectid < end && key.objectid + key.offset <= end);
caching_ctl->progress = key.objectid;
offset = key.objectid;
while (offset < key.objectid + key.offset) {
bit = free_space_test_bit(block_group, path, offset);
if (prev_bit == 0 && bit == 1) {
extent_start = offset;
} else if (prev_bit == 1 && bit == 0) {
total_found += add_new_free_space(block_group,
fs_info,
extent_start,
offset);
if (total_found > CACHING_CTL_WAKE_UP) {
total_found = 0;
wake_up(&caching_ctl->wait);
}
extent_count++;
}
prev_bit = bit;
offset += block_group->sectorsize;
}
}
if (prev_bit == 1) {
total_found += add_new_free_space(block_group, fs_info,
extent_start, end);
extent_count++;
}
if (extent_count != expected_extent_count) {
btrfs_err(fs_info, "incorrect extent count for %llu; counted %u, expected %u",
block_group->key.objectid, extent_count,
expected_extent_count);
ASSERT(0);
ret = -EIO;
goto out;
}
caching_ctl->progress = (u64)-1;
ret = 0;
out:
return ret;
}
static int load_free_space_extents(struct btrfs_caching_control *caching_ctl,
struct btrfs_path *path,
u32 expected_extent_count)
{
struct btrfs_block_group_cache *block_group;
struct btrfs_fs_info *fs_info;
struct btrfs_root *root;
struct btrfs_key key;
u64 end;
u64 total_found = 0;
u32 extent_count = 0;
int ret;
block_group = caching_ctl->block_group;
fs_info = block_group->fs_info;
root = fs_info->free_space_root;
end = block_group->key.objectid + block_group->key.offset;
while (1) {
ret = btrfs_next_item(root, path);
if (ret < 0)
goto out;
if (ret)
break;
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
if (key.type == BTRFS_FREE_SPACE_INFO_KEY)
break;
ASSERT(key.type == BTRFS_FREE_SPACE_EXTENT_KEY);
ASSERT(key.objectid < end && key.objectid + key.offset <= end);
caching_ctl->progress = key.objectid;
total_found += add_new_free_space(block_group, fs_info,
key.objectid,
key.objectid + key.offset);
if (total_found > CACHING_CTL_WAKE_UP) {
total_found = 0;
wake_up(&caching_ctl->wait);
}
extent_count++;
}
if (extent_count != expected_extent_count) {
btrfs_err(fs_info, "incorrect extent count for %llu; counted %u, expected %u",
block_group->key.objectid, extent_count,
expected_extent_count);
ASSERT(0);
ret = -EIO;
goto out;
}
caching_ctl->progress = (u64)-1;
ret = 0;
out:
return ret;
}
int load_free_space_tree(struct btrfs_caching_control *caching_ctl)
{
struct btrfs_block_group_cache *block_group;
struct btrfs_fs_info *fs_info;
struct btrfs_free_space_info *info;
struct btrfs_path *path;
u32 extent_count, flags;
int ret;
block_group = caching_ctl->block_group;
fs_info = block_group->fs_info;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
/*
* Just like caching_thread() doesn't want to deadlock on the extent
* tree, we don't want to deadlock on the free space tree.
*/
path->skip_locking = 1;
path->search_commit_root = 1;
path->reada = 1;
info = search_free_space_info(NULL, fs_info, block_group, path, 0);
if (IS_ERR(info)) {
ret = PTR_ERR(info);
goto out;
}
extent_count = btrfs_free_space_extent_count(path->nodes[0], info);
flags = btrfs_free_space_flags(path->nodes[0], info);
/*
* We left path pointing to the free space info item, so now
* load_free_space_foo can just iterate through the free space tree from
* there.
*/
if (flags & BTRFS_FREE_SPACE_USING_BITMAPS)
ret = load_free_space_bitmaps(caching_ctl, path, extent_count);
else
ret = load_free_space_extents(caching_ctl, path, extent_count);
out:
btrfs_free_path(path);
return ret;
}
fs/btrfs/free-space-tree.h 0 → 100644
View file @ f7d3d2f9
/*
* Copyright (C) 2015 Facebook. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#ifndef __BTRFS_FREE_SPACE_TREE
#define __BTRFS_FREE_SPACE_TREE
/*
* The default size for new free space bitmap items. The last bitmap in a block
* group may be truncated, and none of the free space tree code assumes that
* existing bitmaps are this size.
*/
#define BTRFS_FREE_SPACE_BITMAP_SIZE 256
#define BTRFS_FREE_SPACE_BITMAP_BITS (BTRFS_FREE_SPACE_BITMAP_SIZE * BITS_PER_BYTE)
void set_free_space_tree_thresholds(struct btrfs_block_group_cache *block_group);
int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info);
int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info);
int load_free_space_tree(struct btrfs_caching_control *caching_ctl);
int add_block_group_free_space(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group);
int remove_block_group_free_space(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group);
int add_to_free_space_tree(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
u64 start, u64 size);
int remove_from_free_space_tree(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
u64 start, u64 size);
/* Exposed for testing. */
struct btrfs_free_space_info *
search_free_space_info(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group,
struct btrfs_path *path, int cow);
int __add_to_free_space_tree(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group,
struct btrfs_path *path, u64 start, u64 size);
int __remove_from_free_space_tree(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group,
struct btrfs_path *path, u64 start, u64 size);
int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group,
struct btrfs_path *path);
int convert_free_space_to_extents(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group,
struct btrfs_path *path);
int free_space_test_bit(struct btrfs_block_group_cache *block_group,
struct btrfs_path *path, u64 offset);
#endif
fs/btrfs/super.c
View file @ f7d3d2f9
......@@ -295,10 +295,11 @@ 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,
......@@ -340,6 +341,7 @@ 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"},
......@@ -383,7 +385,9 @@ 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)
......@@ -617,15 +621,35 @@ 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,
......@@ -754,8 +778,17 @@ 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;
}
......@@ -1162,6 +1195,8 @@ 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))
......@@ -2225,6 +2260,9 @@ static int btrfs_run_sanity_tests(void)
if (ret)
goto out;
ret = btrfs_test_qgroups();
if (ret)
goto out;
ret = btrfs_test_free_space_tree();
out:
btrfs_destroy_test_fs();
return ret;
......
fs/btrfs/tests/btrfs-tests.c
View file @ f7d3d2f9
......@@ -21,6 +21,9 @@
#include <linux/magic.h>
#include "btrfs-tests.h"
#include "../ctree.h"
#include "../free-space-cache.h"
#include "../free-space-tree.h"
#include "../transaction.h"
#include "../volumes.h"
#include "../disk-io.h"
#include "../qgroup.h"
......@@ -122,6 +125,9 @@ struct btrfs_fs_info *btrfs_alloc_dummy_fs_info(void)
INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC);
INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
extent_io_tree_init(&fs_info->freed_extents[0], NULL);
extent_io_tree_init(&fs_info->freed_extents[1], NULL);
fs_info->pinned_extents = &fs_info->freed_extents[0];
return fs_info;
}
......@@ -169,3 +175,55 @@ void btrfs_free_dummy_root(struct btrfs_root *root)
kfree(root);
}
struct btrfs_block_group_cache *
btrfs_alloc_dummy_block_group(unsigned long length)
{
struct btrfs_block_group_cache *cache;
cache = kzalloc(sizeof(*cache), GFP_NOFS);
if (!cache)
return NULL;
cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl),
GFP_NOFS);
if (!cache->free_space_ctl) {
kfree(cache);
return NULL;
}
cache->fs_info = btrfs_alloc_dummy_fs_info();
if (!cache->fs_info) {
kfree(cache->free_space_ctl);
kfree(cache);
return NULL;
}
cache->key.objectid = 0;
cache->key.offset = length;
cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
cache->sectorsize = 4096;
cache->full_stripe_len = 4096;
INIT_LIST_HEAD(&cache->list);
INIT_LIST_HEAD(&cache->cluster_list);
INIT_LIST_HEAD(&cache->bg_list);
btrfs_init_free_space_ctl(cache);
mutex_init(&cache->free_space_lock);
return cache;
}
void btrfs_free_dummy_block_group(struct btrfs_block_group_cache *cache)
{
if (!cache)
return;
__btrfs_remove_free_space_cache(cache->free_space_ctl);
kfree(cache->free_space_ctl);
kfree(cache);
}
void btrfs_init_dummy_trans(struct btrfs_trans_handle *trans)
{
memset(trans, 0, sizeof(*trans));
trans->transid = 1;
INIT_LIST_HEAD(&trans->qgroup_ref_list);
trans->type = __TRANS_DUMMY;
}
fs/btrfs/tests/btrfs-tests.h
View file @ f7d3d2f9
......@@ -24,17 +24,23 @@
#define test_msg(fmt, ...) pr_info("BTRFS: selftest: " fmt, ##__VA_ARGS__)
struct btrfs_root;
struct btrfs_trans_handle;
int btrfs_test_free_space_cache(void);
int btrfs_test_extent_buffer_operations(void);
int btrfs_test_extent_io(void);
int btrfs_test_inodes(void);
int btrfs_test_qgroups(void);
int btrfs_test_free_space_tree(void);
int btrfs_init_test_fs(void);
void btrfs_destroy_test_fs(void);
struct inode *btrfs_new_test_inode(void);
struct btrfs_fs_info *btrfs_alloc_dummy_fs_info(void);
void btrfs_free_dummy_root(struct btrfs_root *root);
struct btrfs_block_group_cache *
btrfs_alloc_dummy_block_group(unsigned long length);
void btrfs_free_dummy_block_group(struct btrfs_block_group_cache *cache);
void btrfs_init_dummy_trans(struct btrfs_trans_handle *trans);
#else
static inline int btrfs_test_free_space_cache(void)
{
......@@ -63,6 +69,10 @@ static inline int btrfs_test_qgroups(void)
{
return 0;
}
static inline int btrfs_test_free_space_tree(void)
{
return 0;
}
#endif
#endif
fs/btrfs/tests/extent-io-tests.c
View file @ f7d3d2f9
......@@ -18,6 +18,7 @@
#include <linux/pagemap.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include "btrfs-tests.h"
#include "../extent_io.h"
......@@ -76,6 +77,8 @@ static int test_find_delalloc(void)
u64 found;
int ret = -EINVAL;
test_msg("Running find delalloc tests\n");
inode = btrfs_new_test_inode();
if (!inode) {
test_msg("Failed to allocate test inode\n");
......@@ -268,8 +271,139 @@ static int test_find_delalloc(void)
return ret;
}
static int __test_eb_bitmaps(unsigned long *bitmap, struct extent_buffer *eb,
unsigned long len)
{
unsigned long i, x;
memset(bitmap, 0, len);
memset_extent_buffer(eb, 0, 0, len);
if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
test_msg("Bitmap was not zeroed\n");
return -EINVAL;
}
bitmap_set(bitmap, 0, len * BITS_PER_BYTE);
extent_buffer_bitmap_set(eb, 0, 0, len * BITS_PER_BYTE);
if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
test_msg("Setting all bits failed\n");
return -EINVAL;
}
bitmap_clear(bitmap, 0, len * BITS_PER_BYTE);
extent_buffer_bitmap_clear(eb, 0, 0, len * BITS_PER_BYTE);
if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
test_msg("Clearing all bits failed\n");
return -EINVAL;
}
bitmap_set(bitmap, (PAGE_CACHE_SIZE - sizeof(long) / 2) * BITS_PER_BYTE,
sizeof(long) * BITS_PER_BYTE);
extent_buffer_bitmap_set(eb, PAGE_CACHE_SIZE - sizeof(long) / 2, 0,
sizeof(long) * BITS_PER_BYTE);
if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
test_msg("Setting straddling pages failed\n");
return -EINVAL;
}
bitmap_set(bitmap, 0, len * BITS_PER_BYTE);
bitmap_clear(bitmap,
(PAGE_CACHE_SIZE - sizeof(long) / 2) * BITS_PER_BYTE,
sizeof(long) * BITS_PER_BYTE);
extent_buffer_bitmap_set(eb, 0, 0, len * BITS_PER_BYTE);
extent_buffer_bitmap_clear(eb, PAGE_CACHE_SIZE - sizeof(long) / 2, 0,
sizeof(long) * BITS_PER_BYTE);
if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
test_msg("Clearing straddling pages failed\n");
return -EINVAL;
}
/*
* Generate a wonky pseudo-random bit pattern for the sake of not using
* something repetitive that could miss some hypothetical off-by-n bug.
*/
x = 0;
for (i = 0; i < len / sizeof(long); i++) {
x = (0x19660dULL * (u64)x + 0x3c6ef35fULL) & 0xffffffffUL;
bitmap[i] = x;
}
write_extent_buffer(eb, bitmap, 0, len);
for (i = 0; i < len * BITS_PER_BYTE; i++) {
int bit, bit1;
bit = !!test_bit(i, bitmap);
bit1 = !!extent_buffer_test_bit(eb, 0, i);
if (bit1 != bit) {
test_msg("Testing bit pattern failed\n");
return -EINVAL;
}
bit1 = !!extent_buffer_test_bit(eb, i / BITS_PER_BYTE,
i % BITS_PER_BYTE);
if (bit1 != bit) {
test_msg("Testing bit pattern with offset failed\n");
return -EINVAL;
}
}
return 0;
}
static int test_eb_bitmaps(void)
{
unsigned long len = PAGE_CACHE_SIZE * 4;
unsigned long *bitmap;
struct extent_buffer *eb;
int ret;
test_msg("Running extent buffer bitmap tests\n");
bitmap = kmalloc(len, GFP_NOFS);
if (!bitmap) {
test_msg("Couldn't allocate test bitmap\n");
return -ENOMEM;
}
eb = __alloc_dummy_extent_buffer(NULL, 0, len);
if (!eb) {
test_msg("Couldn't allocate test extent buffer\n");
kfree(bitmap);
return -ENOMEM;
}
ret = __test_eb_bitmaps(bitmap, eb, len);
if (ret)
goto out;
/* Do it over again with an extent buffer which isn't page-aligned. */
free_extent_buffer(eb);
eb = __alloc_dummy_extent_buffer(NULL, PAGE_CACHE_SIZE / 2, len);
if (!eb) {
test_msg("Couldn't allocate test extent buffer\n");
kfree(bitmap);
return -ENOMEM;
}
ret = __test_eb_bitmaps(bitmap, eb, len);
out:
free_extent_buffer(eb);
kfree(bitmap);
return ret;
}
int btrfs_test_extent_io(void)
{
test_msg("Running find delalloc tests\n");
return test_find_delalloc();
int ret;
test_msg("Running extent I/O tests\n");
ret = test_find_delalloc();
if (ret)
goto out;
ret = test_eb_bitmaps();
out:
test_msg("Extent I/O tests finished\n");
return ret;
}
fs/btrfs/tests/free-space-tests.c
View file @ f7d3d2f9
......@@ -23,41 +23,6 @@
#include "../free-space-cache.h"
#define BITS_PER_BITMAP (PAGE_CACHE_SIZE * 8)
static struct btrfs_block_group_cache *init_test_block_group(void)
{
struct btrfs_block_group_cache *cache;
cache = kzalloc(sizeof(*cache), GFP_NOFS);
if (!cache)
return NULL;
cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl),
GFP_NOFS);
if (!cache->free_space_ctl) {
kfree(cache);
return NULL;
}
cache->fs_info = btrfs_alloc_dummy_fs_info();
if (!cache->fs_info) {
kfree(cache->free_space_ctl);
kfree(cache);
return NULL;
}
cache->key.objectid = 0;
cache->key.offset = 1024 * 1024 * 1024;
cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
cache->sectorsize = 4096;
cache->full_stripe_len = 4096;
spin_lock_init(&cache->lock);
INIT_LIST_HEAD(&cache->list);
INIT_LIST_HEAD(&cache->cluster_list);
INIT_LIST_HEAD(&cache->bg_list);
btrfs_init_free_space_ctl(cache);
return cache;
}
/*
* This test just does basic sanity checking, making sure we can add an exten
......@@ -891,7 +856,7 @@ int btrfs_test_free_space_cache(void)
test_msg("Running btrfs free space cache tests\n");
cache = init_test_block_group();
cache = btrfs_alloc_dummy_block_group(1024 * 1024 * 1024);
if (!cache) {
test_msg("Couldn't run the tests\n");
return 0;
......@@ -922,9 +887,7 @@ int btrfs_test_free_space_cache(void)
ret = test_steal_space_from_bitmap_to_extent(cache);
out:
__btrfs_remove_free_space_cache(cache->free_space_ctl);
kfree(cache->free_space_ctl);
kfree(cache);
btrfs_free_dummy_block_group(cache);
btrfs_free_dummy_root(root);
test_msg("Free space cache tests finished\n");
return ret;
......
fs/btrfs/tests/free-space-tree-tests.c 0 → 100644
View file @ f7d3d2f9
/*
* Copyright (C) 2015 Facebook. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include "btrfs-tests.h"
#include "../ctree.h"
#include "../disk-io.h"
#include "../free-space-tree.h"
#include "../transaction.h"
struct free_space_extent {
u64 start, length;
};
/*
* The test cases align their operations to this in order to hit some of the
* edge cases in the bitmap code.
*/
#define BITMAP_RANGE (BTRFS_FREE_SPACE_BITMAP_BITS * 4096)
static int __check_free_space_extents(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *cache,
struct btrfs_path *path,
struct free_space_extent *extents,
unsigned int num_extents)
{
struct btrfs_free_space_info *info;
struct btrfs_key key;
int prev_bit = 0, bit;
u64 extent_start = 0, offset, end;
u32 flags, extent_count;
unsigned int i;
int ret;
info = search_free_space_info(trans, fs_info, cache, path, 0);
if (IS_ERR(info)) {
test_msg("Could not find free space info\n");
ret = PTR_ERR(info);
goto out;
}
flags = btrfs_free_space_flags(path->nodes[0], info);
extent_count = btrfs_free_space_extent_count(path->nodes[0], info);
if (extent_count != num_extents) {
test_msg("Extent count is wrong\n");
ret = -EINVAL;
goto out;
}
if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) {
if (path->slots[0] != 0)
goto invalid;
end = cache->key.objectid + cache->key.offset;
i = 0;
while (++path->slots[0] < btrfs_header_nritems(path->nodes[0])) {
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
if (key.type != BTRFS_FREE_SPACE_BITMAP_KEY)
goto invalid;
offset = key.objectid;
while (offset < key.objectid + key.offset) {
bit = free_space_test_bit(cache, path, offset);
if (prev_bit == 0 && bit == 1) {
extent_start = offset;
} else if (prev_bit == 1 && bit == 0) {
if (i >= num_extents)
goto invalid;
if (i >= num_extents ||
extent_start != extents[i].start ||
offset - extent_start != extents[i].length)
goto invalid;
i++;
}
prev_bit = bit;
offset += cache->sectorsize;
}
}
if (prev_bit == 1) {
if (i >= num_extents ||
extent_start != extents[i].start ||
end - extent_start != extents[i].length)
goto invalid;
i++;
}
if (i != num_extents)
goto invalid;
} else {
if (btrfs_header_nritems(path->nodes[0]) != num_extents + 1 ||
path->slots[0] != 0)
goto invalid;
for (i = 0; i < num_extents; i++) {
path->slots[0]++;
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
if (key.type != BTRFS_FREE_SPACE_EXTENT_KEY ||
key.objectid != extents[i].start ||
key.offset != extents[i].length)
goto invalid;
}
}
ret = 0;
out:
btrfs_release_path(path);
return ret;
invalid:
test_msg("Free space tree is invalid\n");
ret = -EINVAL;
goto out;
}
static int check_free_space_extents(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *cache,
struct btrfs_path *path,
struct free_space_extent *extents,
unsigned int num_extents)
{
struct btrfs_free_space_info *info;
u32 flags;
int ret;
info = search_free_space_info(trans, fs_info, cache, path, 0);
if (IS_ERR(info)) {
test_msg("Could not find free space info\n");
btrfs_release_path(path);
return PTR_ERR(info);
}
flags = btrfs_free_space_flags(path->nodes[0], info);
btrfs_release_path(path);
ret = __check_free_space_extents(trans, fs_info, cache, path, extents,
num_extents);
if (ret)
return ret;
/* Flip it to the other format and check that for good measure. */
if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) {
ret = convert_free_space_to_extents(trans, fs_info, cache, path);
if (ret) {
test_msg("Could not convert to extents\n");
return ret;
}
} else {
ret = convert_free_space_to_bitmaps(trans, fs_info, cache, path);
if (ret) {
test_msg("Could not convert to bitmaps\n");
return ret;
}
}
return __check_free_space_extents(trans, fs_info, cache, path, extents,
num_extents);
}
static int test_empty_block_group(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *cache,
struct btrfs_path *path)
{
struct free_space_extent extents[] = {
{cache->key.objectid, cache->key.offset},
};
return check_free_space_extents(trans, fs_info, cache, path,
extents, ARRAY_SIZE(extents));
}
static int test_remove_all(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *cache,
struct btrfs_path *path)
{
struct free_space_extent extents[] = {};
int ret;
ret = __remove_from_free_space_tree(trans, fs_info, cache, path,
cache->key.objectid,
cache->key.offset);
if (ret) {
test_msg("Could not remove free space\n");
return ret;
}
return check_free_space_extents(trans, fs_info, cache, path,
extents, ARRAY_SIZE(extents));
}
static int test_remove_beginning(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *cache,
struct btrfs_path *path)
{
struct free_space_extent extents[] = {
{cache->key.objectid + BITMAP_RANGE,
cache->key.offset - BITMAP_RANGE},
};
int ret;
ret = __remove_from_free_space_tree(trans, fs_info, cache, path,
cache->key.objectid, BITMAP_RANGE);
if (ret) {
test_msg("Could not remove free space\n");
return ret;
}
return check_free_space_extents(trans, fs_info, cache, path,
extents, ARRAY_SIZE(extents));
}
static int test_remove_end(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *cache,
struct btrfs_path *path)
{
struct free_space_extent extents[] = {
{cache->key.objectid, cache->key.offset - BITMAP_RANGE},
};
int ret;
ret = __remove_from_free_space_tree(trans, fs_info, cache, path,
cache->key.objectid +
cache->key.offset - BITMAP_RANGE,
BITMAP_RANGE);
if (ret) {
test_msg("Could not remove free space\n");
return ret;
}
return check_free_space_extents(trans, fs_info, cache, path,
extents, ARRAY_SIZE(extents));
}
static int test_remove_middle(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *cache,
struct btrfs_path *path)
{
struct free_space_extent extents[] = {
{cache->key.objectid, BITMAP_RANGE},
{cache->key.objectid + 2 * BITMAP_RANGE,
cache->key.offset - 2 * BITMAP_RANGE},
};
int ret;
ret = __remove_from_free_space_tree(trans, fs_info, cache, path,
cache->key.objectid + BITMAP_RANGE,
BITMAP_RANGE);
if (ret) {
test_msg("Could not remove free space\n");
return ret;
}
return check_free_space_extents(trans, fs_info, cache, path,
extents, ARRAY_SIZE(extents));
}
static int test_merge_left(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *cache,
struct btrfs_path *path)
{
struct free_space_extent extents[] = {
{cache->key.objectid, 2 * BITMAP_RANGE},
};
int ret;
ret = __remove_from_free_space_tree(trans, fs_info, cache, path,
cache->key.objectid,
cache->key.offset);
if (ret) {
test_msg("Could not remove free space\n");
return ret;
}
ret = __add_to_free_space_tree(trans, fs_info, cache, path,
cache->key.objectid, BITMAP_RANGE);
if (ret) {
test_msg("Could not add free space\n");
return ret;
}
ret = __add_to_free_space_tree(trans, fs_info, cache, path,
cache->key.objectid + BITMAP_RANGE,
BITMAP_RANGE);
if (ret) {
test_msg("Could not add free space\n");
return ret;
}
return check_free_space_extents(trans, fs_info, cache, path,
extents, ARRAY_SIZE(extents));
}
static int test_merge_right(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *cache,
struct btrfs_path *path)
{
struct free_space_extent extents[] = {
{cache->key.objectid + BITMAP_RANGE, 2 * BITMAP_RANGE},
};
int ret;
ret = __remove_from_free_space_tree(trans, fs_info, cache, path,
cache->key.objectid,
cache->key.offset);
if (ret) {
test_msg("Could not remove free space\n");
return ret;
}
ret = __add_to_free_space_tree(trans, fs_info, cache, path,
cache->key.objectid + 2 * BITMAP_RANGE,
BITMAP_RANGE);
if (ret) {
test_msg("Could not add free space\n");
return ret;
}
ret = __add_to_free_space_tree(trans, fs_info, cache, path,
cache->key.objectid + BITMAP_RANGE,
BITMAP_RANGE);
if (ret) {
test_msg("Could not add free space\n");
return ret;
}
return check_free_space_extents(trans, fs_info, cache, path,
extents, ARRAY_SIZE(extents));
}
static int test_merge_both(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *cache,
struct btrfs_path *path)
{
struct free_space_extent extents[] = {
{cache->key.objectid, 3 * BITMAP_RANGE},
};
int ret;
ret = __remove_from_free_space_tree(trans, fs_info, cache, path,
cache->key.objectid,
cache->key.offset);
if (ret) {
test_msg("Could not remove free space\n");
return ret;
}
ret = __add_to_free_space_tree(trans, fs_info, cache, path,
cache->key.objectid, BITMAP_RANGE);
if (ret) {
test_msg("Could not add free space\n");
return ret;
}
ret = __add_to_free_space_tree(trans, fs_info, cache, path,
cache->key.objectid + 2 * BITMAP_RANGE,
BITMAP_RANGE);
if (ret) {
test_msg("Could not add free space\n");
return ret;
}
ret = __add_to_free_space_tree(trans, fs_info, cache, path,
cache->key.objectid + BITMAP_RANGE,
BITMAP_RANGE);
if (ret) {
test_msg("Could not add free space\n");
return ret;
}
return check_free_space_extents(trans, fs_info, cache, path,
extents, ARRAY_SIZE(extents));
}
static int test_merge_none(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *cache,
struct btrfs_path *path)
{
struct free_space_extent extents[] = {
{cache->key.objectid, BITMAP_RANGE},
{cache->key.objectid + 2 * BITMAP_RANGE, BITMAP_RANGE},
{cache->key.objectid + 4 * BITMAP_RANGE, BITMAP_RANGE},
};
int ret;
ret = __remove_from_free_space_tree(trans, fs_info, cache, path,
cache->key.objectid,
cache->key.offset);
if (ret) {
test_msg("Could not remove free space\n");
return ret;
}
ret = __add_to_free_space_tree(trans, fs_info, cache, path,
cache->key.objectid, BITMAP_RANGE);
if (ret) {
test_msg("Could not add free space\n");
return ret;
}
ret = __add_to_free_space_tree(trans, fs_info, cache, path,
cache->key.objectid + 4 * BITMAP_RANGE,
BITMAP_RANGE);
if (ret) {
test_msg("Could not add free space\n");
return ret;
}
ret = __add_to_free_space_tree(trans, fs_info, cache, path,
cache->key.objectid + 2 * BITMAP_RANGE,
BITMAP_RANGE);
if (ret) {
test_msg("Could not add free space\n");
return ret;
}
return check_free_space_extents(trans, fs_info, cache, path,
extents, ARRAY_SIZE(extents));
}
typedef int (*test_func_t)(struct btrfs_trans_handle *,
struct btrfs_fs_info *,
struct btrfs_block_group_cache *,
struct btrfs_path *);
static int run_test(test_func_t test_func, int bitmaps)
{
struct btrfs_root *root = NULL;
struct btrfs_block_group_cache *cache = NULL;
struct btrfs_trans_handle trans;
struct btrfs_path *path = NULL;
int ret;
root = btrfs_alloc_dummy_root();
if (IS_ERR(root)) {
test_msg("Couldn't allocate dummy root\n");
ret = PTR_ERR(root);
goto out;
}
root->fs_info = btrfs_alloc_dummy_fs_info();
if (!root->fs_info) {
test_msg("Couldn't allocate dummy fs info\n");
ret = -ENOMEM;
goto out;
}
btrfs_set_super_compat_ro_flags(root->fs_info->super_copy,
BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE);
root->fs_info->free_space_root = root;
root->fs_info->tree_root = root;
root->node = alloc_test_extent_buffer(root->fs_info, 4096);
if (!root->node) {
test_msg("Couldn't allocate dummy buffer\n");
ret = -ENOMEM;
goto out;
}
btrfs_set_header_level(root->node, 0);
btrfs_set_header_nritems(root->node, 0);
root->alloc_bytenr += 8192;
cache = btrfs_alloc_dummy_block_group(8 * BITMAP_RANGE);
if (!cache) {
test_msg("Couldn't allocate dummy block group cache\n");
ret = -ENOMEM;
goto out;
}
cache->bitmap_low_thresh = 0;
cache->bitmap_high_thresh = (u32)-1;
cache->needs_free_space = 1;
btrfs_init_dummy_trans(&trans);
path = btrfs_alloc_path();
if (!path) {
test_msg("Couldn't allocate path\n");
return -ENOMEM;
}
ret = add_block_group_free_space(&trans, root->fs_info, cache);
if (ret) {
test_msg("Could not add block group free space\n");
goto out;
}
if (bitmaps) {
ret = convert_free_space_to_bitmaps(&trans, root->fs_info,
cache, path);
if (ret) {
test_msg("Could not convert block group to bitmaps\n");
goto out;
}
}
ret = test_func(&trans, root->fs_info, cache, path);
if (ret)
goto out;
ret = remove_block_group_free_space(&trans, root->fs_info, cache);
if (ret) {
test_msg("Could not remove block group free space\n");
goto out;
}
if (btrfs_header_nritems(root->node) != 0) {
test_msg("Free space tree has leftover items\n");
ret = -EINVAL;
goto out;
}
ret = 0;
out:
btrfs_free_path(path);
btrfs_free_dummy_block_group(cache);
btrfs_free_dummy_root(root);
return ret;
}
static int run_test_both_formats(test_func_t test_func)
{
int ret;
ret = run_test(test_func, 0);
if (ret)
return ret;
return run_test(test_func, 1);
}
int btrfs_test_free_space_tree(void)
{
test_func_t tests[] = {
test_empty_block_group,
test_remove_all,
test_remove_beginning,
test_remove_end,
test_remove_middle,
test_merge_left,
test_merge_right,
test_merge_both,
test_merge_none,
};
int i;
test_msg("Running free space tree tests\n");
for (i = 0; i < ARRAY_SIZE(tests); i++) {
int ret = run_test_both_formats(tests[i]);
if (ret) {
test_msg("%pf failed\n", tests[i]);
return ret;
}
}
return 0;
}
fs/btrfs/tests/qgroup-tests.c
View file @ f7d3d2f9
......@@ -23,14 +23,6 @@
#include "../qgroup.h"
#include "../backref.h"
static void init_dummy_trans(struct btrfs_trans_handle *trans)
{
memset(trans, 0, sizeof(*trans));
trans->transid = 1;
INIT_LIST_HEAD(&trans->qgroup_ref_list);
trans->type = __TRANS_DUMMY;
}
static int insert_normal_tree_ref(struct btrfs_root *root, u64 bytenr,
u64 num_bytes, u64 parent, u64 root_objectid)
{
......@@ -44,7 +36,7 @@ static int insert_normal_tree_ref(struct btrfs_root *root, u64 bytenr,
u32 size = sizeof(*item) + sizeof(*iref) + sizeof(*block_info);
int ret;
init_dummy_trans(&trans);
btrfs_init_dummy_trans(&trans);
ins.objectid = bytenr;
ins.type = BTRFS_EXTENT_ITEM_KEY;
......@@ -94,7 +86,7 @@ static int add_tree_ref(struct btrfs_root *root, u64 bytenr, u64 num_bytes,
u64 refs;
int ret;
init_dummy_trans(&trans);
btrfs_init_dummy_trans(&trans);
key.objectid = bytenr;
key.type = BTRFS_EXTENT_ITEM_KEY;
......@@ -144,7 +136,7 @@ static int remove_extent_item(struct btrfs_root *root, u64 bytenr,
struct btrfs_path *path;
int ret;
init_dummy_trans(&trans);
btrfs_init_dummy_trans(&trans);
key.objectid = bytenr;
key.type = BTRFS_EXTENT_ITEM_KEY;
......@@ -178,7 +170,7 @@ static int remove_extent_ref(struct btrfs_root *root, u64 bytenr,
u64 refs;
int ret;
init_dummy_trans(&trans);
btrfs_init_dummy_trans(&trans);
key.objectid = bytenr;
key.type = BTRFS_EXTENT_ITEM_KEY;
......@@ -232,7 +224,7 @@ static int test_no_shared_qgroup(struct btrfs_root *root)
struct ulist *new_roots = NULL;
int ret;
init_dummy_trans(&trans);
btrfs_init_dummy_trans(&trans);
test_msg("Qgroup basic add\n");
ret = btrfs_create_qgroup(NULL, fs_info, 5);
......@@ -326,7 +318,7 @@ static int test_multiple_refs(struct btrfs_root *root)
struct ulist *new_roots = NULL;
int ret;
init_dummy_trans(&trans);
btrfs_init_dummy_trans(&trans);
test_msg("Qgroup multiple refs test\n");
......
include/trace/events/btrfs.h
View file @ f7d3d2f9
......@@ -45,7 +45,8 @@ struct btrfs_qgroup_operation;
{ BTRFS_TREE_LOG_OBJECTID, "TREE_LOG" }, \
{ BTRFS_QUOTA_TREE_OBJECTID, "QUOTA_TREE" }, \
{ BTRFS_TREE_RELOC_OBJECTID, "TREE_RELOC" }, \
{ BTRFS_UUID_TREE_OBJECTID, "UUID_RELOC" }, \
{ BTRFS_UUID_TREE_OBJECTID, "UUID_TREE" }, \
{ BTRFS_FREE_SPACE_TREE_OBJECTID, "FREE_SPACE_TREE" }, \
{ BTRFS_DATA_RELOC_TREE_OBJECTID, "DATA_RELOC_TREE" })
#define show_root_type(obj) \
......
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