static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct extent_buffer *buf,
- struct extent_buffer *cow)
+ struct extent_buffer *cow,
+ int *last_ref)
{
u64 refs;
u64 owner;
BUG_ON(ret);
}
clean_tree_block(trans, root, buf);
+ *last_ref = 1;
}
return 0;
}
struct btrfs_disk_key disk_key;
struct extent_buffer *cow;
int level;
+ int last_ref = 0;
int unlock_orig = 0;
u64 parent_start;
(unsigned long)btrfs_header_fsid(cow),
BTRFS_FSID_SIZE);
- update_ref_for_cow(trans, root, buf, cow);
+ update_ref_for_cow(trans, root, buf, cow, &last_ref);
if (buf == root->node) {
WARN_ON(parent && parent != buf);
extent_buffer_get(cow);
spin_unlock(&root->node_lock);
- btrfs_free_tree_block(trans, root, buf->start, buf->len,
- parent_start, root->root_key.objectid, level);
+ btrfs_free_tree_block(trans, root, buf, parent_start,
+ last_ref);
free_extent_buffer(buf);
add_root_to_dirty_list(root);
} else {
btrfs_set_node_ptr_generation(parent, parent_slot,
trans->transid);
btrfs_mark_buffer_dirty(parent);
- btrfs_free_tree_block(trans, root, buf->start, buf->len,
- parent_start, root->root_key.objectid, level);
+ btrfs_free_tree_block(trans, root, buf, parent_start,
+ last_ref);
}
if (unlock_orig)
btrfs_tree_unlock(buf);
return bin_search(eb, key, level, slot);
}
+static void root_add_used(struct btrfs_root *root, u32 size)
+{
+ spin_lock(&root->accounting_lock);
+ btrfs_set_root_used(&root->root_item,
+ btrfs_root_used(&root->root_item) + size);
+ spin_unlock(&root->accounting_lock);
+}
+
+static void root_sub_used(struct btrfs_root *root, u32 size)
+{
+ spin_lock(&root->accounting_lock);
+ btrfs_set_root_used(&root->root_item,
+ btrfs_root_used(&root->root_item) - size);
+ spin_unlock(&root->accounting_lock);
+}
+
/* given a node and slot number, this reads the blocks it points to. The
* extent buffer is returned with a reference taken (but unlocked).
* NULL is returned on error.
btrfs_tree_lock(child);
btrfs_set_lock_blocking(child);
ret = btrfs_cow_block(trans, root, child, mid, 0, &child);
- BUG_ON(ret);
+ if (ret) {
+ btrfs_tree_unlock(child);
+ free_extent_buffer(child);
+ goto enospc;
+ }
spin_lock(&root->node_lock);
root->node = child;
btrfs_tree_unlock(mid);
/* once for the path */
free_extent_buffer(mid);
- ret = btrfs_free_tree_block(trans, root, mid->start, mid->len,
- 0, root->root_key.objectid, level);
+
+ root_sub_used(root, mid->len);
+ btrfs_free_tree_block(trans, root, mid, 0, 1);
/* once for the root ptr */
free_extent_buffer(mid);
- return ret;
+ return 0;
}
if (btrfs_header_nritems(mid) >
BTRFS_NODEPTRS_PER_BLOCK(root) / 4)
if (wret < 0 && wret != -ENOSPC)
ret = wret;
if (btrfs_header_nritems(right) == 0) {
- u64 bytenr = right->start;
- u32 blocksize = right->len;
-
clean_tree_block(trans, root, right);
btrfs_tree_unlock(right);
- free_extent_buffer(right);
- right = NULL;
wret = del_ptr(trans, root, path, level + 1, pslot +
1);
if (wret)
ret = wret;
- wret = btrfs_free_tree_block(trans, root,
- bytenr, blocksize, 0,
- root->root_key.objectid,
- level);
- if (wret)
- ret = wret;
+ root_sub_used(root, right->len);
+ btrfs_free_tree_block(trans, root, right, 0, 1);
+ free_extent_buffer(right);
+ right = NULL;
} else {
struct btrfs_disk_key right_key;
btrfs_node_key(right, &right_key, 0);
BUG_ON(wret == 1);
}
if (btrfs_header_nritems(mid) == 0) {
- /* we've managed to empty the middle node, drop it */
- u64 bytenr = mid->start;
- u32 blocksize = mid->len;
-
clean_tree_block(trans, root, mid);
btrfs_tree_unlock(mid);
- free_extent_buffer(mid);
- mid = NULL;
wret = del_ptr(trans, root, path, level + 1, pslot);
if (wret)
ret = wret;
- wret = btrfs_free_tree_block(trans, root, bytenr, blocksize,
- 0, root->root_key.objectid, level);
- if (wret)
- ret = wret;
+ root_sub_used(root, mid->len);
+ btrfs_free_tree_block(trans, root, mid, 0, 1);
+ free_extent_buffer(mid);
+ mid = NULL;
} else {
/* update the parent key to reflect our changes */
struct btrfs_disk_key mid_key;
p->nodes[level + 1],
p->slots[level + 1], &b);
if (err) {
- free_extent_buffer(b);
ret = err;
goto done;
}
if (IS_ERR(c))
return PTR_ERR(c);
+ root_add_used(root, root->nodesize);
+
memset_extent_buffer(c, 0, 0, sizeof(struct btrfs_header));
btrfs_set_header_nritems(c, 1);
btrfs_set_header_level(c, level);
int nritems;
BUG_ON(!path->nodes[level]);
+ btrfs_assert_tree_locked(path->nodes[level]);
lower = path->nodes[level];
nritems = btrfs_header_nritems(lower);
BUG_ON(slot > nritems);
if (IS_ERR(split))
return PTR_ERR(split);
+ root_add_used(root, root->nodesize);
+
memset_extent_buffer(split, 0, 0, sizeof(struct btrfs_header));
btrfs_set_header_level(split, btrfs_header_level(c));
btrfs_set_header_bytenr(split, split->start);
if (left_nritems)
btrfs_mark_buffer_dirty(left);
+ else
+ clean_tree_block(trans, root, left);
+
btrfs_mark_buffer_dirty(right);
btrfs_item_key(right, &disk_key, 0);
btrfs_mark_buffer_dirty(left);
if (right_nritems)
btrfs_mark_buffer_dirty(right);
+ else
+ clean_tree_block(trans, root, right);
btrfs_item_key(right, &disk_key, 0);
wret = fixup_low_keys(trans, root, path, &disk_key, 1);
/* then fixup the leaf pointer in the path */
if (path->slots[0] < push_items) {
path->slots[0] += old_left_nritems;
- if (btrfs_header_nritems(path->nodes[0]) == 0)
- clean_tree_block(trans, root, path->nodes[0]);
btrfs_tree_unlock(path->nodes[0]);
free_extent_buffer(path->nodes[0]);
path->nodes[0] = left;
right = btrfs_alloc_free_block(trans, root, root->leafsize, 0,
root->root_key.objectid,
&disk_key, 0, l->start, 0);
- if (IS_ERR(right)) {
- BUG_ON(1);
+ if (IS_ERR(right))
return PTR_ERR(right);
- }
+
+ root_add_used(root, root->leafsize);
memset_extent_buffer(right, 0, 0, sizeof(struct btrfs_header));
btrfs_set_header_bytenr(right, right->start);
btrfs_set_path_blocking(path);
ret = split_leaf(trans, root, &key, path, ins_len, 1);
- BUG_ON(ret);
+ if (ret)
+ goto err;
path->keep_locks = 0;
btrfs_unlock_up_safe(path, 1);
*/
btrfs_unlock_up_safe(path, 0);
- ret = btrfs_free_tree_block(trans, root, leaf->start, leaf->len,
- 0, root->root_key.objectid, 0);
- return ret;
+ root_sub_used(root, leaf->len);
+
+ btrfs_free_tree_block(trans, root, leaf, 0, 1);
+ return 0;
}
/*
* delete the item at the leaf level in path. If that empties
if (leaf == root->node) {
btrfs_set_header_level(leaf, 0);
} else {
+ btrfs_set_path_blocking(path);
+ clean_tree_block(trans, root, leaf);
ret = btrfs_del_leaf(trans, root, path, leaf);
BUG_ON(ret);
}
static int update_block_group(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
- u64 bytenr, u64 num_bytes, int alloc,
- int mark_free);
-static int update_reserved_extents(struct btrfs_block_group_cache *cache,
- u64 num_bytes, int reserve);
+ u64 bytenr, u64 num_bytes, int alloc);
+static int update_reserved_bytes(struct btrfs_block_group_cache *cache,
+ u64 num_bytes, int reserve, int sinfo);
static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u64 num_bytes, u64 parent,
static int do_chunk_alloc(struct btrfs_trans_handle *trans,
struct btrfs_root *extent_root, u64 alloc_bytes,
u64 flags, int force);
-static int pin_down_bytes(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct btrfs_path *path,
- u64 bytenr, u64 num_bytes,
- int is_data, int reserved,
- struct extent_buffer **must_clean);
static int find_next_key(struct btrfs_path *path, int level,
struct btrfs_key *key);
static void dump_space_info(struct btrfs_space_info *info, u64 bytes,
void btrfs_put_block_group(struct btrfs_block_group_cache *cache)
{
- if (atomic_dec_and_test(&cache->count))
+ if (atomic_dec_and_test(&cache->count)) {
+ WARN_ON(cache->pinned > 0);
+ WARN_ON(cache->reserved > 0);
+ WARN_ON(cache->reserved_pinned > 0);
kfree(cache);
+ }
}
/*
exclude_super_stripes(extent_root, block_group);
spin_lock(&block_group->space_info->lock);
- block_group->space_info->bytes_super += block_group->bytes_super;
+ block_group->space_info->bytes_readonly += block_group->bytes_super;
spin_unlock(&block_group->space_info->lock);
last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET);
return ret;
}
-
/* helper function to actually process a single delayed ref entry */
static int run_one_delayed_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
BUG_ON(extent_op);
head = btrfs_delayed_node_to_head(node);
if (insert_reserved) {
- int mark_free = 0;
- struct extent_buffer *must_clean = NULL;
-
- ret = pin_down_bytes(trans, root, NULL,
- node->bytenr, node->num_bytes,
- head->is_data, 1, &must_clean);
- if (ret > 0)
- mark_free = 1;
-
- if (must_clean) {
- clean_tree_block(NULL, root, must_clean);
- btrfs_tree_unlock(must_clean);
- free_extent_buffer(must_clean);
- }
+ btrfs_pin_extent(root, node->bytenr,
+ node->num_bytes, 1);
if (head->is_data) {
ret = btrfs_del_csums(trans, root,
node->bytenr,
node->num_bytes);
BUG_ON(ret);
}
- if (mark_free) {
- ret = btrfs_free_reserved_extent(root,
- node->bytenr,
- node->num_bytes);
- BUG_ON(ret);
- }
}
mutex_unlock(&head->mutex);
return 0;
ret = 0;
out:
btrfs_free_path(path);
+ if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID)
+ WARN_ON(ret > 0);
return ret;
}
found->bytes_pinned = 0;
found->bytes_reserved = 0;
found->bytes_readonly = 0;
- found->bytes_delalloc = 0;
+ found->bytes_may_use = 0;
found->full = 0;
found->force_alloc = 0;
*space_info = found;
}
}
-static void set_block_group_readonly(struct btrfs_block_group_cache *cache)
-{
- spin_lock(&cache->space_info->lock);
- spin_lock(&cache->lock);
- if (!cache->ro) {
- cache->space_info->bytes_readonly += cache->key.offset -
- btrfs_block_group_used(&cache->item);
- cache->ro = 1;
- }
- spin_unlock(&cache->lock);
- spin_unlock(&cache->space_info->lock);
-}
-
u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags)
{
u64 num_devices = root->fs_info->fs_devices->rw_devices;
void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *inode)
{
- u64 alloc_target;
-
- alloc_target = btrfs_get_alloc_profile(root, 1);
BTRFS_I(inode)->space_info = __find_space_info(root->fs_info,
- alloc_target);
+ BTRFS_BLOCK_GROUP_DATA);
}
static u64 calculate_bytes_needed(struct btrfs_root *root, int num_items)
return reclaimed >= to_reclaim;
}
+static int should_retry_reserve(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_block_rsv *block_rsv,
+ u64 num_bytes, int *retries)
+{
+ struct btrfs_space_info *space_info = block_rsv->space_info;
+ int ret;
+
+ if ((*retries) > 2)
+ return -ENOSPC;
+
+ ret = maybe_allocate_chunk(trans, root, space_info, num_bytes);
+ if (ret)
+ return 1;
+
+ if (trans && trans->transaction->in_commit)
+ return -ENOSPC;
+
+ ret = shrink_delalloc(trans, root, space_info, num_bytes);
+ if (ret)
+ return ret;
+
+ spin_lock(&space_info->lock);
+ if (space_info->bytes_pinned < num_bytes)
+ ret = 1;
+ spin_unlock(&space_info->lock);
+ if (ret)
+ return -ENOSPC;
+
+ (*retries)++;
+
+ if (trans)
+ return -EAGAIN;
+
+ trans = btrfs_join_transaction(root, 1);
+ BUG_ON(IS_ERR(trans));
+ ret = btrfs_commit_transaction(trans, root);
+ BUG_ON(ret);
+
+ return 1;
+}
+
+static int reserve_metadata_bytes(struct btrfs_block_rsv *block_rsv,
+ u64 num_bytes)
+{
+ struct btrfs_space_info *space_info = block_rsv->space_info;
+ u64 unused;
+ int ret = -ENOSPC;
+
+ spin_lock(&space_info->lock);
+ unused = space_info->bytes_used + space_info->bytes_reserved +
+ space_info->bytes_pinned + space_info->bytes_readonly;
+
+ if (unused < space_info->total_bytes)
+ unused = space_info->total_bytes - unused;
+ else
+ unused = 0;
+
+ if (unused >= num_bytes) {
+ if (block_rsv->priority >= 10) {
+ space_info->bytes_reserved += num_bytes;
+ ret = 0;
+ } else {
+ if ((unused + block_rsv->reserved) *
+ block_rsv->priority >=
+ (num_bytes + block_rsv->reserved) * 10) {
+ space_info->bytes_reserved += num_bytes;
+ ret = 0;
+ }
+ }
+ }
+ spin_unlock(&space_info->lock);
+
+ return ret;
+}
+
+static struct btrfs_block_rsv *get_block_rsv(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root)
+{
+ struct btrfs_block_rsv *block_rsv;
+ if (root->ref_cows)
+ block_rsv = trans->block_rsv;
+ else
+ block_rsv = root->block_rsv;
+
+ if (!block_rsv)
+ block_rsv = &root->fs_info->empty_block_rsv;
+
+ return block_rsv;
+}
+
+static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv,
+ u64 num_bytes)
+{
+ int ret = -ENOSPC;
+ spin_lock(&block_rsv->lock);
+ if (block_rsv->reserved >= num_bytes) {
+ block_rsv->reserved -= num_bytes;
+ if (block_rsv->reserved < block_rsv->size)
+ block_rsv->full = 0;
+ ret = 0;
+ }
+ spin_unlock(&block_rsv->lock);
+ return ret;
+}
+
+static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv,
+ u64 num_bytes, int update_size)
+{
+ spin_lock(&block_rsv->lock);
+ block_rsv->reserved += num_bytes;
+ if (update_size)
+ block_rsv->size += num_bytes;
+ else if (block_rsv->reserved >= block_rsv->size)
+ block_rsv->full = 1;
+ spin_unlock(&block_rsv->lock);
+}
+
+void block_rsv_release_bytes(struct btrfs_block_rsv *block_rsv,
+ struct btrfs_block_rsv *dest, u64 num_bytes)
+{
+ struct btrfs_space_info *space_info = block_rsv->space_info;
+
+ spin_lock(&block_rsv->lock);
+ if (num_bytes == (u64)-1)
+ num_bytes = block_rsv->size;
+ block_rsv->size -= num_bytes;
+ if (block_rsv->reserved >= block_rsv->size) {
+ num_bytes = block_rsv->reserved - block_rsv->size;
+ block_rsv->reserved = block_rsv->size;
+ block_rsv->full = 1;
+ } else {
+ num_bytes = 0;
+ }
+ spin_unlock(&block_rsv->lock);
+
+ if (num_bytes > 0) {
+ if (dest) {
+ block_rsv_add_bytes(dest, num_bytes, 0);
+ } else {
+ spin_lock(&space_info->lock);
+ space_info->bytes_reserved -= num_bytes;
+ spin_unlock(&space_info->lock);
+ }
+ }
+}
+
+static int block_rsv_migrate_bytes(struct btrfs_block_rsv *src,
+ struct btrfs_block_rsv *dst, u64 num_bytes)
+{
+ int ret;
+
+ ret = block_rsv_use_bytes(src, num_bytes);
+ if (ret)
+ return ret;
+
+ block_rsv_add_bytes(dst, num_bytes, 1);
+ return 0;
+}
+
+void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv)
+{
+ memset(rsv, 0, sizeof(*rsv));
+ spin_lock_init(&rsv->lock);
+ atomic_set(&rsv->usage, 1);
+ rsv->priority = 6;
+ INIT_LIST_HEAD(&rsv->list);
+}
+
+struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root)
+{
+ struct btrfs_block_rsv *block_rsv;
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ u64 alloc_target;
+
+ block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS);
+ if (!block_rsv)
+ return NULL;
+
+ btrfs_init_block_rsv(block_rsv);
+
+ alloc_target = btrfs_get_alloc_profile(root, 0);
+ block_rsv->space_info = __find_space_info(fs_info,
+ BTRFS_BLOCK_GROUP_METADATA);
+
+ return block_rsv;
+}
+
+void btrfs_free_block_rsv(struct btrfs_root *root,
+ struct btrfs_block_rsv *rsv)
+{
+ if (rsv && atomic_dec_and_test(&rsv->usage)) {
+ btrfs_block_rsv_release(root, rsv, (u64)-1);
+ if (!rsv->durable)
+ kfree(rsv);
+ }
+}
+
+/*
+ * make the block_rsv struct be able to capture freed space.
+ * the captured space will re-add to the the block_rsv struct
+ * after transaction commit
+ */
+void btrfs_add_durable_block_rsv(struct btrfs_fs_info *fs_info,
+ struct btrfs_block_rsv *block_rsv)
+{
+ block_rsv->durable = 1;
+ mutex_lock(&fs_info->durable_block_rsv_mutex);
+ list_add_tail(&block_rsv->list, &fs_info->durable_block_rsv_list);
+ mutex_unlock(&fs_info->durable_block_rsv_mutex);
+}
+
+int btrfs_block_rsv_add(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_block_rsv *block_rsv,
+ u64 num_bytes, int *retries)
+{
+ int ret;
+
+ if (num_bytes == 0)
+ return 0;
+again:
+ ret = reserve_metadata_bytes(block_rsv, num_bytes);
+ if (!ret) {
+ block_rsv_add_bytes(block_rsv, num_bytes, 1);
+ return 0;
+ }
+
+ ret = should_retry_reserve(trans, root, block_rsv, num_bytes, retries);
+ if (ret > 0)
+ goto again;
+
+ return ret;
+}
+
+int btrfs_block_rsv_check(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_block_rsv *block_rsv,
+ u64 min_reserved, int min_factor)
+{
+ u64 num_bytes = 0;
+ int commit_trans = 0;
+ int ret = -ENOSPC;
+
+ if (!block_rsv)
+ return 0;
+
+ spin_lock(&block_rsv->lock);
+ if (min_factor > 0)
+ num_bytes = div_factor(block_rsv->size, min_factor);
+ if (min_reserved > num_bytes)
+ num_bytes = min_reserved;
+
+ if (block_rsv->reserved >= num_bytes) {
+ ret = 0;
+ } else {
+ num_bytes -= block_rsv->reserved;
+ if (block_rsv->durable &&
+ block_rsv->freed[0] + block_rsv->freed[1] >= num_bytes)
+ commit_trans = 1;
+ }
+ spin_unlock(&block_rsv->lock);
+ if (!ret)
+ return 0;
+
+ if (block_rsv->refill_used) {
+ ret = reserve_metadata_bytes(block_rsv, num_bytes);
+ if (!ret) {
+ block_rsv_add_bytes(block_rsv, num_bytes, 0);
+ return 0;
+ }
+ }
+
+ if (commit_trans) {
+ if (trans)
+ return -EAGAIN;
+
+ trans = btrfs_join_transaction(root, 1);
+ BUG_ON(IS_ERR(trans));
+ ret = btrfs_commit_transaction(trans, root);
+ return 0;
+ }
+
+ WARN_ON(1);
+ printk(KERN_INFO"block_rsv size %llu reserved %llu freed %llu %llu\n",
+ block_rsv->size, block_rsv->reserved,
+ block_rsv->freed[0], block_rsv->freed[1]);
+
+ return -ENOSPC;
+}
+
+int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
+ struct btrfs_block_rsv *dst_rsv,
+ u64 num_bytes)
+{
+ return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes);
+}
+
+void btrfs_block_rsv_release(struct btrfs_root *root,
+ struct btrfs_block_rsv *block_rsv,
+ u64 num_bytes)
+{
+ struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv;
+ if (global_rsv->full || global_rsv == block_rsv ||
+ block_rsv->space_info != global_rsv->space_info)
+ global_rsv = NULL;
+ block_rsv_release_bytes(block_rsv, global_rsv, num_bytes);
+}
+
+static void init_global_block_rsv(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_space_info *space_info;
+
+ space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM);
+ fs_info->chunk_block_rsv.space_info = space_info;
+ fs_info->chunk_block_rsv.priority = 10;
+
+ space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA);
+ fs_info->trans_block_rsv.space_info = space_info;
+ fs_info->empty_block_rsv.space_info = space_info;
+ fs_info->empty_block_rsv.priority = 10;
+
+ fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv;
+}
+
static int update_block_group(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
- u64 bytenr, u64 num_bytes, int alloc,
- int mark_free)
+ u64 bytenr, u64 num_bytes, int alloc)
{
struct btrfs_block_group_cache *cache;
struct btrfs_fs_info *info = root->fs_info;
cache->space_info->bytes_reserved -= num_bytes;
cache->space_info->bytes_used += num_bytes;
cache->space_info->disk_used += num_bytes * factor;
- if (cache->ro)
- cache->space_info->bytes_readonly -= num_bytes;
spin_unlock(&cache->lock);
spin_unlock(&cache->space_info->lock);
} else {
old_val -= num_bytes;
btrfs_set_block_group_used(&cache->item, old_val);
+ cache->pinned += num_bytes;
+ cache->space_info->bytes_pinned += num_bytes;
cache->space_info->bytes_used -= num_bytes;
cache->space_info->disk_used -= num_bytes * factor;
- if (cache->ro)
- cache->space_info->bytes_readonly += num_bytes;
spin_unlock(&cache->lock);
spin_unlock(&cache->space_info->lock);
- if (mark_free) {
- int ret;
- ret = btrfs_discard_extent(root, bytenr,
- num_bytes);
- WARN_ON(ret);
-
- ret = btrfs_add_free_space(cache, bytenr,
- num_bytes);
- WARN_ON(ret);
- }
+ set_extent_dirty(info->pinned_extents,
+ bytenr, bytenr + num_bytes - 1,
+ GFP_NOFS | __GFP_NOFAIL);
}
btrfs_put_block_group(cache);
total -= num_bytes;
return bytenr;
}
-/*
- * this function must be called within transaction
- */
-int btrfs_pin_extent(struct btrfs_root *root,
- u64 bytenr, u64 num_bytes, int reserved)
+static int pin_down_extent(struct btrfs_root *root,
+ struct btrfs_block_group_cache *cache,
+ u64 bytenr, u64 num_bytes, int reserved)
{
- struct btrfs_fs_info *fs_info = root->fs_info;
- struct btrfs_block_group_cache *cache;
-
- cache = btrfs_lookup_block_group(fs_info, bytenr);
- BUG_ON(!cache);
-
spin_lock(&cache->space_info->lock);
spin_lock(&cache->lock);
cache->pinned += num_bytes;
spin_unlock(&cache->lock);
spin_unlock(&cache->space_info->lock);
- btrfs_put_block_group(cache);
+ set_extent_dirty(root->fs_info->pinned_extents, bytenr,
+ bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL);
+ return 0;
+}
- set_extent_dirty(fs_info->pinned_extents,
- bytenr, bytenr + num_bytes - 1, GFP_NOFS);
+/*
+ * this function must be called within transaction
+ */
+int btrfs_pin_extent(struct btrfs_root *root,
+ u64 bytenr, u64 num_bytes, int reserved)
+{
+ struct btrfs_block_group_cache *cache;
+
+ cache = btrfs_lookup_block_group(root->fs_info, bytenr);
+ BUG_ON(!cache);
+
+ pin_down_extent(root, cache, bytenr, num_bytes, reserved);
+
+ btrfs_put_block_group(cache);
return 0;
}
-static int update_reserved_extents(struct btrfs_block_group_cache *cache,
- u64 num_bytes, int reserve)
+/*
+ * update size of reserved extents. this function may return -EAGAIN
+ * if 'reserve' is true or 'sinfo' is false.
+ */
+static int update_reserved_bytes(struct btrfs_block_group_cache *cache,
+ u64 num_bytes, int reserve, int sinfo)
{
- spin_lock(&cache->space_info->lock);
- spin_lock(&cache->lock);
- if (reserve) {
- cache->reserved += num_bytes;
- cache->space_info->bytes_reserved += num_bytes;
+ int ret = 0;
+ if (sinfo) {
+ struct btrfs_space_info *space_info = cache->space_info;
+ spin_lock(&space_info->lock);
+ spin_lock(&cache->lock);
+ if (reserve) {
+ if (cache->ro) {
+ ret = -EAGAIN;
+ } else {
+ cache->reserved += num_bytes;
+ space_info->bytes_reserved += num_bytes;
+ }
+ } else {
+ if (cache->ro)
+ space_info->bytes_readonly += num_bytes;
+ cache->reserved -= num_bytes;
+ space_info->bytes_reserved -= num_bytes;
+ }
+ spin_unlock(&cache->lock);
+ spin_unlock(&space_info->lock);
} else {
- cache->reserved -= num_bytes;
- cache->space_info->bytes_reserved -= num_bytes;
+ spin_lock(&cache->lock);
+ if (cache->ro) {
+ ret = -EAGAIN;
+ } else {
+ if (reserve)
+ cache->reserved += num_bytes;
+ else
+ cache->reserved -= num_bytes;
+ }
+ spin_unlock(&cache->lock);
}
- spin_unlock(&cache->lock);
- spin_unlock(&cache->space_info->lock);
- return 0;
+ return ret;
}
int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
btrfs_add_free_space(cache, start, len);
}
+ start += len;
+
spin_lock(&cache->space_info->lock);
spin_lock(&cache->lock);
cache->pinned -= len;
cache->space_info->bytes_pinned -= len;
+ if (cache->ro) {
+ cache->space_info->bytes_readonly += len;
+ } else if (cache->reserved_pinned > 0) {
+ len = min(len, cache->reserved_pinned);
+ cache->reserved_pinned -= len;
+ cache->space_info->bytes_reserved += len;
+ }
spin_unlock(&cache->lock);
spin_unlock(&cache->space_info->lock);
-
- start += len;
}
if (cache)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct extent_io_tree *unpin;
+ struct btrfs_block_rsv *block_rsv;
+ struct btrfs_block_rsv *next_rsv;
u64 start;
u64 end;
+ int idx;
int ret;
if (fs_info->pinned_extents == &fs_info->freed_extents[0])
cond_resched();
}
- return ret;
-}
-
-static int pin_down_bytes(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct btrfs_path *path,
- u64 bytenr, u64 num_bytes,
- int is_data, int reserved,
- struct extent_buffer **must_clean)
-{
- int err = 0;
- struct extent_buffer *buf;
-
- if (is_data)
- goto pinit;
+ mutex_lock(&fs_info->durable_block_rsv_mutex);
+ list_for_each_entry_safe(block_rsv, next_rsv,
+ &fs_info->durable_block_rsv_list, list) {
- /*
- * discard is sloooow, and so triggering discards on
- * individual btree blocks isn't a good plan. Just
- * pin everything in discard mode.
- */
- if (btrfs_test_opt(root, DISCARD))
- goto pinit;
-
- buf = btrfs_find_tree_block(root, bytenr, num_bytes);
- if (!buf)
- goto pinit;
+ idx = trans->transid & 0x1;
+ if (block_rsv->freed[idx] > 0) {
+ block_rsv_add_bytes(block_rsv,
+ block_rsv->freed[idx], 0);
+ block_rsv->freed[idx] = 0;
+ }
+ if (atomic_read(&block_rsv->usage) == 0) {
+ btrfs_block_rsv_release(root, block_rsv, (u64)-1);
- /* we can reuse a block if it hasn't been written
- * and it is from this transaction. We can't
- * reuse anything from the tree log root because
- * it has tiny sub-transactions.
- */
- if (btrfs_buffer_uptodate(buf, 0) &&
- btrfs_try_tree_lock(buf)) {
- u64 header_owner = btrfs_header_owner(buf);
- u64 header_transid = btrfs_header_generation(buf);
- if (header_owner != BTRFS_TREE_LOG_OBJECTID &&
- header_transid == trans->transid &&
- !btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) {
- *must_clean = buf;
- return 1;
+ if (block_rsv->freed[0] == 0 &&
+ block_rsv->freed[1] == 0) {
+ list_del_init(&block_rsv->list);
+ kfree(block_rsv);
+ }
+ } else {
+ btrfs_block_rsv_release(root, block_rsv, 0);
}
- btrfs_tree_unlock(buf);
}
- free_extent_buffer(buf);
-pinit:
- if (path)
- btrfs_set_path_blocking(path);
- /* unlocks the pinned mutex */
- btrfs_pin_extent(root, bytenr, num_bytes, reserved);
+ mutex_unlock(&fs_info->durable_block_rsv_mutex);
- BUG_ON(err < 0);
return 0;
}
BUG_ON(ret);
}
} else {
- int mark_free = 0;
- struct extent_buffer *must_clean = NULL;
-
if (found_extent) {
BUG_ON(is_data && refs_to_drop !=
extent_data_ref_count(root, path, iref));
}
}
- ret = pin_down_bytes(trans, root, path, bytenr,
- num_bytes, is_data, 0, &must_clean);
- if (ret > 0)
- mark_free = 1;
- BUG_ON(ret < 0);
- /*
- * it is going to be very rare for someone to be waiting
- * on the block we're freeing. del_items might need to
- * schedule, so rather than get fancy, just force it
- * to blocking here
- */
- if (must_clean)
- btrfs_set_lock_blocking(must_clean);
-
ret = btrfs_del_items(trans, extent_root, path, path->slots[0],
num_to_del);
BUG_ON(ret);
btrfs_release_path(extent_root, path);
- if (must_clean) {
- clean_tree_block(NULL, root, must_clean);
- btrfs_tree_unlock(must_clean);
- free_extent_buffer(must_clean);
- }
-
if (is_data) {
ret = btrfs_del_csums(trans, root, bytenr, num_bytes);
BUG_ON(ret);
(bytenr + num_bytes - 1) >> PAGE_CACHE_SHIFT);
}
- ret = update_block_group(trans, root, bytenr, num_bytes, 0,
- mark_free);
+ ret = update_block_group(trans, root, bytenr, num_bytes, 0);
BUG_ON(ret);
}
btrfs_free_path(path);
}
/*
- * when we free an extent, it is possible (and likely) that we free the last
+ * when we free an block, it is possible (and likely) that we free the last
* delayed ref for that extent as well. This searches the delayed ref tree for
* a given extent, and if there are no other delayed refs to be processed, it
* removes it from the tree.
struct btrfs_delayed_ref_root *delayed_refs;
struct btrfs_delayed_ref_node *ref;
struct rb_node *node;
- int ret;
+ int ret = 0;
delayed_refs = &trans->transaction->delayed_refs;
spin_lock(&delayed_refs->lock);
list_del_init(&head->cluster);
spin_unlock(&delayed_refs->lock);
- ret = run_one_delayed_ref(trans, root->fs_info->tree_root,
- &head->node, head->extent_op,
- head->must_insert_reserved);
- BUG_ON(ret);
+ BUG_ON(head->extent_op);
+ if (head->must_insert_reserved)
+ ret = 1;
+
+ mutex_unlock(&head->mutex);
btrfs_put_delayed_ref(&head->node);
- return 0;
+ return ret;
out:
spin_unlock(&delayed_refs->lock);
return 0;
}
+void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *buf,
+ u64 parent, int last_ref)
+{
+ struct btrfs_block_rsv *block_rsv;
+ struct btrfs_block_group_cache *cache = NULL;
+ int ret;
+
+ if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
+ ret = btrfs_add_delayed_tree_ref(trans, buf->start, buf->len,
+ parent, root->root_key.objectid,
+ btrfs_header_level(buf),
+ BTRFS_DROP_DELAYED_REF, NULL);
+ BUG_ON(ret);
+ }
+
+ if (!last_ref)
+ return;
+
+ block_rsv = get_block_rsv(trans, root);
+ cache = btrfs_lookup_block_group(root->fs_info, buf->start);
+ BUG_ON(block_rsv->space_info != cache->space_info);
+
+ if (btrfs_header_generation(buf) == trans->transid) {
+ if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
+ ret = check_ref_cleanup(trans, root, buf->start);
+ if (!ret)
+ goto pin;
+ }
+
+ if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) {
+ pin_down_extent(root, cache, buf->start, buf->len, 1);
+ goto pin;
+ }
+
+ WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags));
+
+ btrfs_add_free_space(cache, buf->start, buf->len);
+ ret = update_reserved_bytes(cache, buf->len, 0, 0);
+ if (ret == -EAGAIN) {
+ /* block group became read-only */
+ update_reserved_bytes(cache, buf->len, 0, 1);
+ goto out;
+ }
+
+ ret = 1;
+ spin_lock(&block_rsv->lock);
+ if (block_rsv->reserved < block_rsv->size) {
+ block_rsv->reserved += buf->len;
+ ret = 0;
+ }
+ spin_unlock(&block_rsv->lock);
+
+ if (ret) {
+ spin_lock(&cache->space_info->lock);
+ cache->space_info->bytes_reserved -= buf->len;
+ spin_unlock(&cache->space_info->lock);
+ }
+ goto out;
+ }
+pin:
+ if (block_rsv->durable && !cache->ro) {
+ ret = 0;
+ spin_lock(&cache->lock);
+ if (!cache->ro) {
+ cache->reserved_pinned += buf->len;
+ ret = 1;
+ }
+ spin_unlock(&cache->lock);
+
+ if (ret) {
+ spin_lock(&block_rsv->lock);
+ block_rsv->freed[trans->transid & 0x1] += buf->len;
+ spin_unlock(&block_rsv->lock);
+ }
+ }
+out:
+ btrfs_put_block_group(cache);
+}
+
int btrfs_free_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u64 num_bytes, u64 parent,
parent, root_objectid, (int)owner,
BTRFS_DROP_DELAYED_REF, NULL);
BUG_ON(ret);
- ret = check_ref_cleanup(trans, root, bytenr);
- BUG_ON(ret);
} else {
ret = btrfs_add_delayed_data_ref(trans, bytenr, num_bytes,
parent, root_objectid, owner,
return ret;
}
-int btrfs_free_tree_block(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- u64 bytenr, u32 blocksize,
- u64 parent, u64 root_objectid, int level)
-{
- u64 used;
- spin_lock(&root->node_lock);
- used = btrfs_root_used(&root->root_item) - blocksize;
- btrfs_set_root_used(&root->root_item, used);
- spin_unlock(&root->node_lock);
-
- return btrfs_free_extent(trans, root, bytenr, blocksize,
- parent, root_objectid, level, 0);
-}
-
static u64 stripe_align(struct btrfs_root *root, u64 val)
{
u64 mask = ((u64)root->stripesize - 1);
u64 num_bytes, u64 empty_size,
u64 search_start, u64 search_end,
u64 hint_byte, struct btrfs_key *ins,
- u64 exclude_start, u64 exclude_nr,
int data)
{
int ret = 0;
int done_chunk_alloc = 0;
struct btrfs_space_info *space_info;
int last_ptr_loop = 0;
- int index = 0;
int loop = 0;
+ int index = 0;
bool found_uncached_bg = false;
bool failed_cluster_refill = false;
bool failed_alloc = false;
goto loop;
}
- if (exclude_nr > 0 &&
- (search_start + num_bytes > exclude_start &&
- search_start < exclude_start + exclude_nr)) {
- search_start = exclude_start + exclude_nr;
+ ins->objectid = search_start;
+ ins->offset = num_bytes;
+ if (offset < search_start)
+ btrfs_add_free_space(block_group, offset,
+ search_start - offset);
+ BUG_ON(offset > search_start);
+
+ ret = update_reserved_bytes(block_group, num_bytes, 1,
+ (data & BTRFS_BLOCK_GROUP_DATA));
+ if (ret == -EAGAIN) {
btrfs_add_free_space(block_group, offset, num_bytes);
- /*
- * if search_start is still in this block group
- * then we just re-search this block group
- */
- if (search_start >= block_group->key.objectid &&
- search_start < (block_group->key.objectid +
- block_group->key.offset))
- goto have_block_group;
goto loop;
}
+ /* we are all good, lets return */
ins->objectid = search_start;
ins->offset = num_bytes;
btrfs_add_free_space(block_group, offset,
search_start - offset);
BUG_ON(offset > search_start);
-
- update_reserved_extents(block_group, num_bytes, 1);
-
- /* we are all good, lets return */
break;
loop:
failed_cluster_refill = false;
WARN_ON(num_bytes < root->sectorsize);
ret = find_free_extent(trans, root, num_bytes, empty_size,
- search_start, search_end, hint_byte, ins,
- trans->alloc_exclude_start,
- trans->alloc_exclude_nr, data);
+ search_start, search_end, hint_byte,
+ ins, data);
if (ret == -ENOSPC && num_bytes > min_alloc_size) {
num_bytes = num_bytes >> 1;
ret = btrfs_discard_extent(root, start, len);
btrfs_add_free_space(cache, start, len);
- update_reserved_extents(cache, len, 0);
+ update_reserved_bytes(cache, len, 0, 1);
btrfs_put_block_group(cache);
return ret;
btrfs_mark_buffer_dirty(path->nodes[0]);
btrfs_free_path(path);
- ret = update_block_group(trans, root, ins->objectid, ins->offset,
- 1, 0);
+ ret = update_block_group(trans, root, ins->objectid, ins->offset, 1);
if (ret) {
printk(KERN_ERR "btrfs update block group failed for %llu "
"%llu\n", (unsigned long long)ins->objectid,
btrfs_mark_buffer_dirty(leaf);
btrfs_free_path(path);
- ret = update_block_group(trans, root, ins->objectid, ins->offset,
- 1, 0);
+ ret = update_block_group(trans, root, ins->objectid, ins->offset, 1);
if (ret) {
printk(KERN_ERR "btrfs update block group failed for %llu "
"%llu\n", (unsigned long long)ins->objectid,
put_caching_control(caching_ctl);
}
- update_reserved_extents(block_group, ins->offset, 1);
+ ret = update_reserved_bytes(block_group, ins->offset, 1, 1);
+ BUG_ON(ret);
btrfs_put_block_group(block_group);
ret = alloc_reserved_file_extent(trans, root, 0, root_objectid,
0, owner, offset, ins, 1);
return ret;
}
-/*
- * finds a free extent and does all the dirty work required for allocation
- * returns the key for the extent through ins, and a tree buffer for
- * the first block of the extent through buf.
- *
- * returns 0 if everything worked, non-zero otherwise.
- */
-static int alloc_tree_block(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- u64 num_bytes, u64 parent, u64 root_objectid,
- struct btrfs_disk_key *key, int level,
- u64 empty_size, u64 hint_byte, u64 search_end,
- struct btrfs_key *ins)
-{
- int ret;
- u64 flags = 0;
-
- ret = btrfs_reserve_extent(trans, root, num_bytes, num_bytes,
- empty_size, hint_byte, search_end,
- ins, 0);
- if (ret)
- return ret;
-
- if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) {
- if (parent == 0)
- parent = ins->objectid;
- flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF;
- } else
- BUG_ON(parent > 0);
-
- if (root_objectid != BTRFS_TREE_LOG_OBJECTID) {
- struct btrfs_delayed_extent_op *extent_op;
- extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS);
- BUG_ON(!extent_op);
- if (key)
- memcpy(&extent_op->key, key, sizeof(extent_op->key));
- else
- memset(&extent_op->key, 0, sizeof(extent_op->key));
- extent_op->flags_to_set = flags;
- extent_op->update_key = 1;
- extent_op->update_flags = 1;
- extent_op->is_data = 0;
-
- ret = btrfs_add_delayed_tree_ref(trans, ins->objectid,
- ins->offset, parent, root_objectid,
- level, BTRFS_ADD_DELAYED_EXTENT,
- extent_op);
- BUG_ON(ret);
- }
-
- if (root_objectid == root->root_key.objectid) {
- u64 used;
- spin_lock(&root->node_lock);
- used = btrfs_root_used(&root->root_item) + num_bytes;
- btrfs_set_root_used(&root->root_item, used);
- spin_unlock(&root->node_lock);
- }
- return ret;
-}
-
struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u32 blocksize,
return buf;
}
+static struct btrfs_block_rsv *
+use_block_rsv(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u32 blocksize)
+{
+ struct btrfs_block_rsv *block_rsv;
+ int ret;
+
+ block_rsv = get_block_rsv(trans, root);
+
+ if (block_rsv->size == 0) {
+ ret = reserve_metadata_bytes(block_rsv, blocksize);
+ if (ret)
+ return ERR_PTR(ret);
+ return block_rsv;
+ }
+
+ ret = block_rsv_use_bytes(block_rsv, blocksize);
+ if (!ret)
+ return block_rsv;
+
+ WARN_ON(1);
+ printk(KERN_INFO"block_rsv size %llu reserved %llu freed %llu %llu\n",
+ block_rsv->size, block_rsv->reserved,
+ block_rsv->freed[0], block_rsv->freed[1]);
+
+ return ERR_PTR(-ENOSPC);
+}
+
+static void unuse_block_rsv(struct btrfs_block_rsv *block_rsv, u32 blocksize)
+{
+ block_rsv_add_bytes(block_rsv, blocksize, 0);
+ block_rsv_release_bytes(block_rsv, NULL, 0);
+}
+
/*
- * helper function to allocate a block for a given tree
+ * finds a free extent and does all the dirty work required for allocation
+ * returns the key for the extent through ins, and a tree buffer for
+ * the first block of the extent through buf.
+ *
* returns the tree buffer or NULL.
*/
struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
u64 hint, u64 empty_size)
{
struct btrfs_key ins;
- int ret;
+ struct btrfs_block_rsv *block_rsv;
struct extent_buffer *buf;
+ u64 flags = 0;
+ int ret;
+
- ret = alloc_tree_block(trans, root, blocksize, parent, root_objectid,
- key, level, empty_size, hint, (u64)-1, &ins);
+ block_rsv = use_block_rsv(trans, root, blocksize);
+ if (IS_ERR(block_rsv))
+ return ERR_CAST(block_rsv);
+
+ ret = btrfs_reserve_extent(trans, root, blocksize, blocksize,
+ empty_size, hint, (u64)-1, &ins, 0);
if (ret) {
- BUG_ON(ret > 0);
+ unuse_block_rsv(block_rsv, blocksize);
return ERR_PTR(ret);
}
buf = btrfs_init_new_buffer(trans, root, ins.objectid,
blocksize, level);
+ BUG_ON(IS_ERR(buf));
+
+ if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) {
+ if (parent == 0)
+ parent = ins.objectid;
+ flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF;
+ } else
+ BUG_ON(parent > 0);
+
+ if (root_objectid != BTRFS_TREE_LOG_OBJECTID) {
+ struct btrfs_delayed_extent_op *extent_op;
+ extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS);
+ BUG_ON(!extent_op);
+ if (key)
+ memcpy(&extent_op->key, key, sizeof(extent_op->key));
+ else
+ memset(&extent_op->key, 0, sizeof(extent_op->key));
+ extent_op->flags_to_set = flags;
+ extent_op->update_key = 1;
+ extent_op->update_flags = 1;
+ extent_op->is_data = 0;
+
+ ret = btrfs_add_delayed_tree_ref(trans, ins.objectid,
+ ins.offset, parent, root_objectid,
+ level, BTRFS_ADD_DELAYED_EXTENT,
+ extent_op);
+ BUG_ON(ret);
+ }
return buf;
}
struct btrfs_path *path,
struct walk_control *wc)
{
- int ret = 0;
+ int ret;
int level = wc->level;
struct extent_buffer *eb = path->nodes[level];
u64 parent = 0;
btrfs_header_owner(path->nodes[level + 1]));
}
- ret = btrfs_free_extent(trans, root, eb->start, eb->len, parent,
- root->root_key.objectid, level, 0);
- BUG_ON(ret);
+ btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1);
out:
wc->refs[level] = 0;
wc->flags[level] = 0;
- return ret;
+ return 0;
}
static noinline int walk_down_tree(struct btrfs_trans_handle *trans,
return flags;
}
-static int __alloc_chunk_for_shrink(struct btrfs_root *root,
- struct btrfs_block_group_cache *shrink_block_group,
- int force)
+static int set_block_group_ro(struct btrfs_block_group_cache *cache)
{
- struct btrfs_trans_handle *trans;
- u64 new_alloc_flags;
- u64 calc;
+ struct btrfs_space_info *sinfo = cache->space_info;
+ u64 num_bytes;
+ int ret = -ENOSPC;
- spin_lock(&shrink_block_group->lock);
- if (btrfs_block_group_used(&shrink_block_group->item) +
- shrink_block_group->reserved > 0) {
- spin_unlock(&shrink_block_group->lock);
+ if (cache->ro)
+ return 0;
- trans = btrfs_start_transaction(root, 1);
- spin_lock(&shrink_block_group->lock);
+ spin_lock(&sinfo->lock);
+ spin_lock(&cache->lock);
+ num_bytes = cache->key.offset - cache->reserved - cache->pinned -
+ cache->bytes_super - btrfs_block_group_used(&cache->item);
+
+ if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned +
+ sinfo->bytes_may_use + sinfo->bytes_readonly +
+ cache->reserved_pinned + num_bytes < sinfo->total_bytes) {
+ sinfo->bytes_readonly += num_bytes;
+ sinfo->bytes_reserved += cache->reserved_pinned;
+ cache->reserved_pinned = 0;
+ cache->ro = 1;
+ ret = 0;
+ }
+ spin_unlock(&cache->lock);
+ spin_unlock(&sinfo->lock);
+ return ret;
+}
- new_alloc_flags = update_block_group_flags(root,
- shrink_block_group->flags);
- if (new_alloc_flags != shrink_block_group->flags) {
- calc =
- btrfs_block_group_used(&shrink_block_group->item);
- } else {
- calc = shrink_block_group->key.offset;
- }
- spin_unlock(&shrink_block_group->lock);
+int btrfs_set_block_group_ro(struct btrfs_root *root,
+ struct btrfs_block_group_cache *cache)
- do_chunk_alloc(trans, root->fs_info->extent_root,
- calc + 2 * 1024 * 1024, new_alloc_flags, force);
+{
+ struct btrfs_trans_handle *trans;
+ u64 alloc_flags;
+ int ret;
- btrfs_end_transaction(trans, root);
- } else
- spin_unlock(&shrink_block_group->lock);
- return 0;
-}
+ BUG_ON(cache->ro);
+ trans = btrfs_join_transaction(root, 1);
+ BUG_ON(IS_ERR(trans));
-int btrfs_prepare_block_group_relocation(struct btrfs_root *root,
- struct btrfs_block_group_cache *group)
+ alloc_flags = update_block_group_flags(root, cache->flags);
+ if (alloc_flags != cache->flags)
+ do_chunk_alloc(trans, root, 2 * 1024 * 1024, alloc_flags, 1);
+ ret = set_block_group_ro(cache);
+ if (!ret)
+ goto out;
+ alloc_flags = get_alloc_profile(root, cache->space_info->flags);
+ ret = do_chunk_alloc(trans, root, 2 * 1024 * 1024, alloc_flags, 1);
+ if (ret < 0)
+ goto out;
+ ret = set_block_group_ro(cache);
+out:
+ btrfs_end_transaction(trans, root);
+ return ret;
+}
+
+int btrfs_set_block_group_rw(struct btrfs_root *root,
+ struct btrfs_block_group_cache *cache)
{
- __alloc_chunk_for_shrink(root, group, 1);
- set_block_group_readonly(group);
+ struct btrfs_space_info *sinfo = cache->space_info;
+ u64 num_bytes;
+
+ BUG_ON(!cache->ro);
+
+ spin_lock(&sinfo->lock);
+ spin_lock(&cache->lock);
+ num_bytes = cache->key.offset - cache->reserved - cache->pinned -
+ cache->bytes_super - btrfs_block_group_used(&cache->item);
+ sinfo->bytes_readonly -= num_bytes;
+ cache->ro = 0;
+ spin_unlock(&cache->lock);
+ spin_unlock(&sinfo->lock);
return 0;
}
space_info = list_entry(info->space_info.next,
struct btrfs_space_info,
list);
-
+ if (space_info->bytes_pinned > 0 ||
+ space_info->bytes_reserved > 0) {
+ WARN_ON(1);
+ dump_space_info(space_info, 0, 0);
+ }
list_del(&space_info->list);
kfree(space_info);
}
cache = kzalloc(sizeof(*cache), GFP_NOFS);
if (!cache) {
ret = -ENOMEM;
- break;
+ goto error;
}
atomic_set(&cache->count, 1);
BUG_ON(ret);
cache->space_info = space_info;
spin_lock(&cache->space_info->lock);
- cache->space_info->bytes_super += cache->bytes_super;
+ cache->space_info->bytes_readonly += cache->bytes_super;
spin_unlock(&cache->space_info->lock);
__link_block_group(space_info, cache);
set_avail_alloc_bits(root->fs_info, cache->flags);
if (btrfs_chunk_readonly(root, cache->key.objectid))
- set_block_group_readonly(cache);
+ set_block_group_ro(cache);
}
list_for_each_entry_rcu(space_info, &root->fs_info->space_info, list) {
* mirrored block groups.
*/
list_for_each_entry(cache, &space_info->block_groups[3], list)
- set_block_group_readonly(cache);
+ set_block_group_ro(cache);
list_for_each_entry(cache, &space_info->block_groups[4], list)
- set_block_group_readonly(cache);
+ set_block_group_ro(cache);
}
+
+ init_global_block_rsv(info);
ret = 0;
error:
btrfs_free_path(path);
BUG_ON(ret);
spin_lock(&cache->space_info->lock);
- cache->space_info->bytes_super += cache->bytes_super;
+ cache->space_info->bytes_readonly += cache->bytes_super;
spin_unlock(&cache->space_info->lock);
__link_block_group(cache->space_info, cache);
git.openpandora.org / pandora-kernel.git / commitdiff