struct extent_buffer **cow_ret, u64 new_root_objectid)
{
struct extent_buffer *cow;
- u32 nritems;
int ret = 0;
int level;
- struct btrfs_key first_key;
struct btrfs_root *new_root;
new_root = kmalloc(sizeof(*new_root), GFP_NOFS);
WARN_ON(root->ref_cows && trans->transid != root->last_trans);
level = btrfs_header_level(buf);
- nritems = btrfs_header_nritems(buf);
- if (nritems) {
- if (level == 0)
- btrfs_item_key_to_cpu(buf, &first_key, 0);
- else
- btrfs_node_key_to_cpu(buf, &first_key, 0);
- } else {
- first_key.objectid = 0;
- }
- cow = __btrfs_alloc_free_block(trans, new_root, buf->len,
- new_root_objectid,
- trans->transid, first_key.objectid,
- level, buf->start, 0);
+ cow = btrfs_alloc_free_block(trans, new_root, buf->len, 0,
+ new_root_objectid, trans->transid,
+ level, buf->start, 0);
if (IS_ERR(cow)) {
kfree(new_root);
return PTR_ERR(cow);
btrfs_clear_header_flag(cow, BTRFS_HEADER_FLAG_WRITTEN);
WARN_ON(btrfs_header_generation(buf) > trans->transid);
- ret = btrfs_inc_ref(trans, new_root, buf);
+ ret = btrfs_inc_ref(trans, new_root, buf, cow, NULL);
kfree(new_root);
if (ret)
struct extent_buffer **cow_ret,
u64 search_start, u64 empty_size)
{
- u64 root_gen;
+ u64 parent_start;
struct extent_buffer *cow;
u32 nritems;
int ret = 0;
int different_trans = 0;
int level;
- struct btrfs_key first_key;
-
- if (root->ref_cows) {
- root_gen = trans->transid;
- } else {
- root_gen = 0;
- }
WARN_ON(root->ref_cows && trans->transid !=
root->fs_info->running_transaction->transid);
WARN_ON(root->ref_cows && trans->transid != root->last_trans);
+ if (parent)
+ parent_start = parent->start;
+ else
+ parent_start = 0;
+
level = btrfs_header_level(buf);
nritems = btrfs_header_nritems(buf);
- if (nritems) {
- if (level == 0)
- btrfs_item_key_to_cpu(buf, &first_key, 0);
- else
- btrfs_node_key_to_cpu(buf, &first_key, 0);
- } else {
- first_key.objectid = 0;
- }
- cow = __btrfs_alloc_free_block(trans, root, buf->len,
- root->root_key.objectid,
- root_gen, first_key.objectid, level,
- search_start, empty_size);
+ cow = btrfs_alloc_free_block(trans, root, buf->len, parent_start,
+ root->root_key.objectid, trans->transid,
+ level, search_start, empty_size);
if (IS_ERR(cow))
return PTR_ERR(cow);
WARN_ON(btrfs_header_generation(buf) > trans->transid);
if (btrfs_header_generation(buf) != trans->transid) {
different_trans = 1;
- ret = btrfs_inc_ref(trans, root, buf);
+ ret = btrfs_inc_ref(trans, root, buf, cow, NULL);
if (ret)
return ret;
} else {
+ ret = btrfs_update_ref(trans, root, buf, cow, 0, nritems);
+ if (ret)
+ return ret;
clean_tree_block(trans, root, buf);
}
if (buf == root->node) {
- root_gen = btrfs_header_generation(buf);
root->node = cow;
extent_buffer_get(cow);
if (buf != root->commit_root) {
btrfs_free_extent(trans, root, buf->start,
- buf->len, root->root_key.objectid,
- root_gen, 0, 0, 1);
+ buf->len, buf->start,
+ root->root_key.objectid,
+ btrfs_header_generation(buf),
+ 0, 0, 1);
}
free_extent_buffer(buf);
add_root_to_dirty_list(root);
} else {
- root_gen = btrfs_header_generation(parent);
btrfs_set_node_blockptr(parent, parent_slot,
cow->start);
WARN_ON(trans->transid == 0);
btrfs_mark_buffer_dirty(parent);
WARN_ON(btrfs_header_generation(parent) != trans->transid);
btrfs_free_extent(trans, root, buf->start, buf->len,
- btrfs_header_owner(parent), root_gen,
- 0, 0, 1);
+ parent_start, btrfs_header_owner(parent),
+ btrfs_header_generation(parent), 0, 0, 1);
}
free_extent_buffer(buf);
btrfs_mark_buffer_dirty(cow);
BUG_ON(ret);
root->node = child;
+
+ ret = btrfs_update_extent_ref(trans, root, child->start,
+ mid->start, child->start,
+ root->root_key.objectid,
+ trans->transid,
+ level - 1, 0);
+ BUG_ON(ret);
+
add_root_to_dirty_list(root);
path->nodes[level] = NULL;
clean_tree_block(trans, root, mid);
/* once for the path */
free_extent_buffer(mid);
ret = btrfs_free_extent(trans, root, mid->start, mid->len,
- root->root_key.objectid,
+ mid->start, root->root_key.objectid,
btrfs_header_generation(mid), 0, 0, 1);
/* once for the root ptr */
free_extent_buffer(mid);
if (wret)
ret = wret;
wret = btrfs_free_extent(trans, root, bytenr,
- blocksize,
+ blocksize, parent->start,
btrfs_header_owner(parent),
generation, 0, 0, 1);
if (wret)
if (wret)
ret = wret;
wret = btrfs_free_extent(trans, root, bytenr, blocksize,
+ parent->start,
btrfs_header_owner(parent),
root_gen, 0, 0, 1);
if (wret)
}
/*
+ * update item key.
+ *
+ * This function isn't completely safe. It's the caller's responsibility
+ * that the new key won't break the order
+ */
+int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct btrfs_path *path,
+ struct btrfs_key *new_key)
+{
+ struct btrfs_disk_key disk_key;
+ struct extent_buffer *eb;
+ int slot;
+
+ eb = path->nodes[0];
+ slot = path->slots[0];
+ if (slot > 0) {
+ btrfs_item_key(eb, &disk_key, slot - 1);
+ if (btrfs_comp_keys(&disk_key, new_key) >= 0)
+ return -1;
+ }
+ if (slot < btrfs_header_nritems(eb) - 1) {
+ btrfs_item_key(eb, &disk_key, slot + 1);
+ if (btrfs_comp_keys(&disk_key, new_key) <= 0)
+ return -1;
+ }
+
+ btrfs_cpu_key_to_disk(&disk_key, new_key);
+ btrfs_set_item_key(eb, &disk_key, slot);
+ btrfs_mark_buffer_dirty(eb);
+ if (slot == 0)
+ fixup_low_keys(trans, root, path, &disk_key, 1);
+ return 0;
+}
+
+/*
* try to push data from one node into the next node left in the
* tree.
*
btrfs_set_header_nritems(dst, dst_nritems + push_items);
btrfs_mark_buffer_dirty(src);
btrfs_mark_buffer_dirty(dst);
+
+ ret = btrfs_update_ref(trans, root, src, dst, dst_nritems, push_items);
+ BUG_ON(ret);
return ret;
}
btrfs_mark_buffer_dirty(src);
btrfs_mark_buffer_dirty(dst);
+
+ ret = btrfs_update_ref(trans, root, src, dst, 0, push_items);
+ BUG_ON(ret);
return ret;
}
struct btrfs_root *root,
struct btrfs_path *path, int level)
{
- u64 root_gen;
u64 lower_gen;
struct extent_buffer *lower;
struct extent_buffer *c;
+ struct extent_buffer *old;
struct btrfs_disk_key lower_key;
+ int ret;
BUG_ON(path->nodes[level]);
BUG_ON(path->nodes[level-1] != root->node);
- if (root->ref_cows)
- root_gen = trans->transid;
- else
- root_gen = 0;
-
lower = path->nodes[level-1];
if (level == 1)
btrfs_item_key(lower, &lower_key, 0);
else
btrfs_node_key(lower, &lower_key, 0);
- c = __btrfs_alloc_free_block(trans, root, root->nodesize,
+ c = btrfs_alloc_free_block(trans, root, root->nodesize, 0,
root->root_key.objectid,
- root_gen, lower_key.objectid, level,
+ trans->transid, level,
root->node->start, 0);
if (IS_ERR(c))
return PTR_ERR(c);
+
memset_extent_buffer(c, 0, 0, root->nodesize);
btrfs_set_header_nritems(c, 1);
btrfs_set_header_level(c, level);
btrfs_set_node_key(c, &lower_key, 0);
btrfs_set_node_blockptr(c, 0, lower->start);
lower_gen = btrfs_header_generation(lower);
- WARN_ON(lower_gen == 0);
+ WARN_ON(lower_gen != trans->transid);
btrfs_set_node_ptr_generation(c, 0, lower_gen);
btrfs_mark_buffer_dirty(c);
- /* the super has an extra ref to root->node */
- free_extent_buffer(root->node);
+ old = root->node;
root->node = c;
+
+ ret = btrfs_update_extent_ref(trans, root, lower->start,
+ lower->start, c->start,
+ root->root_key.objectid,
+ trans->transid, level - 1, 0);
+ BUG_ON(ret);
+
+ /* the super has an extra ref to root->node */
+ free_extent_buffer(old);
+
add_root_to_dirty_list(root);
extent_buffer_get(c);
path->nodes[level] = c;
path->slots[level] = 0;
-
- if (root->ref_cows && lower_gen != trans->transid) {
- struct btrfs_path *back_path = btrfs_alloc_path();
- int ret;
- ret = btrfs_insert_extent_backref(trans,
- root->fs_info->extent_root,
- path, lower->start,
- root->root_key.objectid,
- trans->transid, 0, 0);
- BUG_ON(ret);
- btrfs_free_path(back_path);
- }
return 0;
}
static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, int level)
{
- u64 root_gen;
struct extent_buffer *c;
struct extent_buffer *split;
struct btrfs_disk_key disk_key;
}
c_nritems = btrfs_header_nritems(c);
- if (root->ref_cows)
- root_gen = trans->transid;
- else
- root_gen = 0;
btrfs_node_key(c, &disk_key, 0);
- split = __btrfs_alloc_free_block(trans, root, root->nodesize,
+ split = btrfs_alloc_free_block(trans, root, root->nodesize,
+ path->nodes[level + 1]->start,
root->root_key.objectid,
- root_gen,
- btrfs_disk_key_objectid(&disk_key),
- level, c->start, 0);
+ trans->transid, level, c->start, 0);
if (IS_ERR(split))
return PTR_ERR(split);
if (wret)
ret = wret;
+ ret = btrfs_update_ref(trans, root, c, split, 0, c_nritems - mid);
+ BUG_ON(ret);
+
if (path->slots[level] >= mid) {
path->slots[level] -= mid;
free_extent_buffer(c);
btrfs_set_node_key(upper, &disk_key, slot + 1);
btrfs_mark_buffer_dirty(upper);
+ ret = btrfs_update_ref(trans, root, left, right, 0, push_items);
+ BUG_ON(ret);
+
/* then fixup the leaf pointer in the path */
if (path->slots[0] >= left_nritems) {
path->slots[0] -= left_nritems;
if (wret)
ret = wret;
+ ret = btrfs_update_ref(trans, root, right, left,
+ old_left_nritems, push_items);
+ BUG_ON(ret);
+
/* then fixup the leaf pointer in the path */
if (path->slots[0] < push_items) {
path->slots[0] += old_left_nritems;
*root, struct btrfs_key *ins_key,
struct btrfs_path *path, int data_size, int extend)
{
- u64 root_gen;
struct extent_buffer *l;
u32 nritems;
int mid;
if (extend)
space_needed = data_size;
- if (root->ref_cows)
- root_gen = trans->transid;
- else
- root_gen = 0;
-
/* first try to make some room by pushing left and right */
if (ins_key->type != BTRFS_DIR_ITEM_KEY) {
wret = push_leaf_right(trans, root, path, data_size, 0);
nritems = btrfs_header_nritems(l);
mid = (nritems + 1)/ 2;
- btrfs_item_key(l, &disk_key, 0);
-
- right = __btrfs_alloc_free_block(trans, root, root->leafsize,
- root->root_key.objectid,
- root_gen, disk_key.objectid, 0,
- l->start, 0);
+ right = btrfs_alloc_free_block(trans, root, root->leafsize,
+ path->nodes[1]->start,
+ root->root_key.objectid,
+ trans->transid, 0, l->start, 0);
if (IS_ERR(right)) {
BUG_ON(1);
return PTR_ERR(right);
btrfs_mark_buffer_dirty(l);
BUG_ON(path->slots[0] != slot);
+ ret = btrfs_update_ref(trans, root, l, right, 0, nritems);
+ BUG_ON(ret);
+
if (mid <= slot) {
free_extent_buffer(path->nodes[0]);
path->nodes[0] = right;
ret = wret;
wret = btrfs_free_extent(trans, root,
leaf->start, leaf->len,
+ path->nodes[1]->start,
btrfs_header_owner(path->nodes[1]),
root_gen, 0, 0, 1);
if (wret)
free_extent_buffer(leaf);
wret = btrfs_free_extent(trans, root, bytenr,
- blocksize,
+ blocksize, path->nodes[1]->start,
btrfs_header_owner(path->nodes[1]),
root_gen, 0, 0, 1);
if (wret)
#define BLOCK_GROUP_DIRTY EXTENT_DIRTY
+#define PENDING_EXTENT_INSERT 0
+#define PENDING_EXTENT_DELETE 1
+#define PENDING_BACKREF_UPDATE 2
+
+struct pending_extent_op {
+ int type;
+ u64 bytenr;
+ u64 num_bytes;
+ u64 parent;
+ u64 orig_parent;
+ u64 generation;
+ u64 orig_generation;
+ int level;
+};
+
static int finish_current_insert(struct btrfs_trans_handle *trans, struct
btrfs_root *extent_root);
static int del_pending_extents(struct btrfs_trans_handle *trans, struct
btrfs_root *extent_root);
+void maybe_lock_mutex(struct btrfs_root *root)
+{
+}
+
+void maybe_unlock_mutex(struct btrfs_root *root)
+{
+}
+
static int cache_block_group(struct btrfs_root *root,
struct btrfs_block_group_cache *block_group)
{
return found_group;
}
-static u64 hash_extent_ref(u64 root_objectid, u64 ref_generation,
- u64 owner, u64 owner_offset)
-{
- u32 high_crc = ~(u32)0;
- u32 low_crc = ~(u32)0;
- __le64 lenum;
-
- lenum = cpu_to_le64(root_objectid);
- high_crc = crc32c(high_crc, &lenum, sizeof(lenum));
- lenum = cpu_to_le64(ref_generation);
- low_crc = crc32c(low_crc, &lenum, sizeof(lenum));
- if (owner >= BTRFS_FIRST_FREE_OBJECTID) {
- lenum = cpu_to_le64(owner);
- low_crc = crc32c(low_crc, &lenum, sizeof(lenum));
- lenum = cpu_to_le64(owner_offset);
- low_crc = crc32c(low_crc, &lenum, sizeof(lenum));
- }
- return ((u64)high_crc << 32) | (u64)low_crc;
-}
-
-static int match_extent_ref(struct extent_buffer *leaf,
- struct btrfs_extent_ref *disk_ref,
- struct btrfs_extent_ref *cpu_ref)
-{
- int ret;
- int len;
-
- if (cpu_ref->objectid)
- len = sizeof(*cpu_ref);
- else
- len = 2 * sizeof(u64);
- ret = memcmp_extent_buffer(leaf, cpu_ref, (unsigned long)disk_ref,
- len);
- return ret == 0;
-}
-
-static int noinline lookup_extent_backref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct btrfs_path *path, u64 bytenr,
- u64 root_objectid,
- u64 ref_generation, u64 owner,
- u64 owner_offset, int del)
-{
- u64 hash;
- struct btrfs_key key;
- struct btrfs_key found_key;
- struct btrfs_extent_ref ref;
- struct extent_buffer *leaf;
- struct btrfs_extent_ref *disk_ref;
- int ret;
- int ret2;
-
- btrfs_set_stack_ref_root(&ref, root_objectid);
- btrfs_set_stack_ref_generation(&ref, ref_generation);
- btrfs_set_stack_ref_objectid(&ref, owner);
- btrfs_set_stack_ref_offset(&ref, owner_offset);
-
- hash = hash_extent_ref(root_objectid, ref_generation, owner,
- owner_offset);
- key.offset = hash;
- key.objectid = bytenr;
- key.type = BTRFS_EXTENT_REF_KEY;
-
- while (1) {
- ret = btrfs_search_slot(trans, root, &key, path,
- del ? -1 : 0, del);
- if (ret < 0)
- goto out;
- leaf = path->nodes[0];
- if (ret != 0) {
- u32 nritems = btrfs_header_nritems(leaf);
- if (path->slots[0] >= nritems) {
- ret2 = btrfs_next_leaf(root, path);
- if (ret2)
- goto out;
- leaf = path->nodes[0];
- }
- btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
- if (found_key.objectid != bytenr ||
- found_key.type != BTRFS_EXTENT_REF_KEY)
- goto out;
- key.offset = found_key.offset;
- if (del) {
- btrfs_release_path(root, path);
- continue;
- }
- }
- disk_ref = btrfs_item_ptr(path->nodes[0],
- path->slots[0],
- struct btrfs_extent_ref);
- if (match_extent_ref(path->nodes[0], disk_ref, &ref)) {
- ret = 0;
- goto out;
- }
- btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
- key.offset = found_key.offset + 1;
- btrfs_release_path(root, path);
- }
-out:
- return ret;
-}
-
/*
* Back reference rules. Back refs have three main goals:
*
* File extents can be referenced by:
*
* - multiple snapshots, subvolumes, or different generations in one subvol
- * - different files inside a single subvolume (in theory, not implemented yet)
+ * - different files inside a single subvolume
* - different offsets inside a file (bookend extents in file.c)
*
* The extent ref structure has fields for:
* - Generation number of the tree holding the reference
* - objectid of the file holding the reference
* - offset in the file corresponding to the key holding the reference
+ * - number of references holding by parent node (alway 1 for tree blocks)
+ *
+ * Btree leaf may hold multiple references to a file extent. In most cases,
+ * these references are from same file and the corresponding offsets inside
+ * the file are close together. So inode objectid and offset in file are
+ * just hints, they provide hints about where in the btree the references
+ * can be found and when we can stop searching.
*
* When a file extent is allocated the fields are filled in:
- * (root_key.objectid, trans->transid, inode objectid, offset in file)
+ * (root_key.objectid, trans->transid, inode objectid, offset in file, 1)
*
* When a leaf is cow'd new references are added for every file extent found
- * in the leaf. It looks the same as the create case, but trans->transid
- * will be different when the block is cow'd.
+ * in the leaf. It looks similar to the create case, but trans->transid will
+ * be different when the block is cow'd.
*
- * (root_key.objectid, trans->transid, inode objectid, offset in file)
+ * (root_key.objectid, trans->transid, inode objectid, offset in file,
+ * number of references in the leaf)
*
- * When a file extent is removed either during snapshot deletion or file
- * truncation, the corresponding back reference is found
- * by searching for:
+ * Because inode objectid and offset in file are just hints, they are not
+ * used when backrefs are deleted. When a file extent is removed either
+ * during snapshot deletion or file truncation, we find the corresponding
+ * back back reference and check the following fields.
*
- * (btrfs_header_owner(leaf), btrfs_header_generation(leaf),
- * inode objectid, offset in file)
+ * (btrfs_header_owner(leaf), btrfs_header_generation(leaf))
*
* Btree extents can be referenced by:
*
* - Different subvolumes
* - Different generations of the same subvolume
*
- * Storing sufficient information for a full reverse mapping of a btree
- * block would require storing the lowest key of the block in the backref,
- * and it would require updating that lowest key either before write out or
- * every time it changed. Instead, the objectid of the lowest key is stored
- * along with the level of the tree block. This provides a hint
- * about where in the btree the block can be found. Searches through the
- * btree only need to look for a pointer to that block, so they stop one
- * level higher than the level recorded in the backref.
- *
- * Some btrees do not do reference counting on their extents. These
- * include the extent tree and the tree of tree roots. Backrefs for these
- * trees always have a generation of zero.
- *
* When a tree block is created, back references are inserted:
*
- * (root->root_key.objectid, trans->transid or zero, level, lowest_key_objectid)
+ * (root->root_key.objectid, trans->transid, level, 0, 1)
*
- * When a tree block is cow'd in a reference counted root,
- * new back references are added for all the blocks it points to.
- * These are of the form (trans->transid will have increased since creation):
+ * When a tree block is cow'd, new back references are added for all the
+ * blocks it points to. If the tree block isn't in reference counted root,
+ * the old back references are removed. These new back references are of
+ * the form (trans->transid will have increased since creation):
*
- * (root->root_key.objectid, trans->transid, level, lowest_key_objectid)
+ * (root->root_key.objectid, trans->transid, level, 0, 1)
*
- * Because the lowest_key_objectid and the level are just hints
- * they are not used when backrefs are deleted. When a backref is deleted:
+ * When a backref is in deleting, the following fields are checked:
*
* if backref was for a tree root:
- * root_objectid = root->root_key.objectid
+ * (btrfs_header_owner(itself), btrfs_header_generation(itself))
* else
- * root_objectid = btrfs_header_owner(parent)
+ * (btrfs_header_owner(parent), btrfs_header_generation(parent))
*
- * (root_objectid, btrfs_header_generation(parent) or zero, 0, 0)
+ * Back Reference Key composing:
*
- * Back Reference Key hashing:
- *
- * Back references have four fields, each 64 bits long. Unfortunately,
- * This is hashed into a single 64 bit number and placed into the key offset.
- * The key objectid corresponds to the first byte in the extent, and the
- * key type is set to BTRFS_EXTENT_REF_KEY
+ * The key objectid corresponds to the first byte in the extent, the key
+ * type is set to BTRFS_EXTENT_REF_KEY, and the key offset is the first
+ * byte of parent extent. If a extent is tree root, the key offset is set
+ * to the key objectid.
*/
-int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct btrfs_path *path, u64 bytenr,
- u64 root_objectid, u64 ref_generation,
- u64 owner, u64 owner_offset)
+
+static int noinline lookup_extent_backref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, u64 bytenr,
+ u64 parent, u64 ref_root,
+ u64 ref_generation, int del)
{
- u64 hash;
struct btrfs_key key;
- struct btrfs_extent_ref ref;
- struct btrfs_extent_ref *disk_ref;
+ struct btrfs_extent_ref *ref;
+ struct extent_buffer *leaf;
int ret;
- btrfs_set_stack_ref_root(&ref, root_objectid);
- btrfs_set_stack_ref_generation(&ref, ref_generation);
- btrfs_set_stack_ref_objectid(&ref, owner);
- btrfs_set_stack_ref_offset(&ref, owner_offset);
+ key.objectid = bytenr;
+ key.type = BTRFS_EXTENT_REF_KEY;
+ key.offset = parent;
+
+ ret = btrfs_search_slot(trans, root, &key, path, del ? -1 : 0, 1);
+ if (ret < 0)
+ goto out;
+ if (ret > 0) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ leaf = path->nodes[0];
+ ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref);
+ if (btrfs_ref_root(leaf, ref) != ref_root ||
+ btrfs_ref_generation(leaf, ref) != ref_generation) {
+ ret = -EIO;
+ WARN_ON(1);
+ goto out;
+ }
+ ret = 0;
+out:
+ return ret;
+}
+
+static int noinline insert_extent_backref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ u64 bytenr, u64 parent,
+ u64 ref_root, u64 ref_generation,
+ u64 owner_objectid, u64 owner_offset)
+{
+ struct btrfs_key key;
+ struct extent_buffer *leaf;
+ struct btrfs_extent_ref *ref;
+ u32 num_refs;
+ int ret;
- hash = hash_extent_ref(root_objectid, ref_generation, owner,
- owner_offset);
- key.offset = hash;
key.objectid = bytenr;
key.type = BTRFS_EXTENT_REF_KEY;
+ key.offset = parent;
- ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(ref));
- while (ret == -EEXIST) {
- disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
- struct btrfs_extent_ref);
- if (match_extent_ref(path->nodes[0], disk_ref, &ref))
+ ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*ref));
+ if (ret == 0) {
+ leaf = path->nodes[0];
+ ref = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_extent_ref);
+ btrfs_set_ref_root(leaf, ref, ref_root);
+ btrfs_set_ref_generation(leaf, ref, ref_generation);
+ btrfs_set_ref_objectid(leaf, ref, owner_objectid);
+ btrfs_set_ref_offset(leaf, ref, owner_offset);
+ btrfs_set_ref_num_refs(leaf, ref, 1);
+ } else if (ret == -EEXIST) {
+ u64 existing_owner;
+ BUG_ON(owner_objectid < BTRFS_FIRST_FREE_OBJECTID);
+ leaf = path->nodes[0];
+ ref = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_extent_ref);
+ if (btrfs_ref_root(leaf, ref) != ref_root ||
+ btrfs_ref_generation(leaf, ref) != ref_generation) {
+ ret = -EIO;
+ WARN_ON(1);
goto out;
- key.offset++;
- btrfs_release_path(root, path);
- ret = btrfs_insert_empty_item(trans, root, path, &key,
- sizeof(ref));
- }
- if (ret)
+ }
+
+ num_refs = btrfs_ref_num_refs(leaf, ref);
+ BUG_ON(num_refs == 0);
+ btrfs_set_ref_num_refs(leaf, ref, num_refs + 1);
+
+ existing_owner = btrfs_ref_objectid(leaf, ref);
+ if (existing_owner == owner_objectid &&
+ btrfs_ref_offset(leaf, ref) > owner_offset) {
+ btrfs_set_ref_offset(leaf, ref, owner_offset);
+ } else if (existing_owner != owner_objectid &&
+ existing_owner != BTRFS_MULTIPLE_OBJECTIDS) {
+ btrfs_set_ref_objectid(leaf, ref,
+ BTRFS_MULTIPLE_OBJECTIDS);
+ btrfs_set_ref_offset(leaf, ref, 0);
+ }
+ ret = 0;
+ } else {
goto out;
- disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
- struct btrfs_extent_ref);
- write_extent_buffer(path->nodes[0], &ref, (unsigned long)disk_ref,
- sizeof(ref));
+ }
btrfs_mark_buffer_dirty(path->nodes[0]);
out:
btrfs_release_path(root, path);
return ret;
}
-int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- u64 bytenr, u64 num_bytes,
- u64 root_objectid, u64 ref_generation,
- u64 owner, u64 owner_offset)
+static int noinline remove_extent_backref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path)
+{
+ struct extent_buffer *leaf;
+ struct btrfs_extent_ref *ref;
+ u32 num_refs;
+ int ret = 0;
+
+ leaf = path->nodes[0];
+ ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref);
+ num_refs = btrfs_ref_num_refs(leaf, ref);
+ BUG_ON(num_refs == 0);
+ num_refs -= 1;
+ if (num_refs == 0) {
+ ret = btrfs_del_item(trans, root, path);
+ } else {
+ btrfs_set_ref_num_refs(leaf, ref, num_refs);
+ btrfs_mark_buffer_dirty(leaf);
+ }
+ btrfs_release_path(root, path);
+ return ret;
+}
+
+static int __btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 bytenr,
+ u64 orig_parent, u64 parent,
+ u64 orig_root, u64 ref_root,
+ u64 orig_generation, u64 ref_generation,
+ u64 owner_objectid, u64 owner_offset)
+{
+ int ret;
+ struct btrfs_root *extent_root = root->fs_info->extent_root;
+ struct btrfs_path *path;
+
+ if (root == root->fs_info->extent_root) {
+ struct pending_extent_op *extent_op;
+ u64 num_bytes;
+
+ BUG_ON(owner_objectid >= BTRFS_MAX_LEVEL);
+ num_bytes = btrfs_level_size(root, (int)owner_objectid);
+ if (test_range_bit(&root->fs_info->extent_ins, bytenr,
+ bytenr + num_bytes - 1, EXTENT_LOCKED, 0)) {
+ u64 priv;
+ ret = get_state_private(&root->fs_info->extent_ins,
+ bytenr, &priv);
+ BUG_ON(ret);
+ extent_op = (struct pending_extent_op *)
+ (unsigned long)priv;
+ BUG_ON(extent_op->parent != orig_parent);
+ BUG_ON(extent_op->generation != orig_generation);
+ extent_op->parent = parent;
+ extent_op->generation = ref_generation;
+ } else {
+ extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS);
+ BUG_ON(!extent_op);
+
+ extent_op->type = PENDING_BACKREF_UPDATE;
+ extent_op->bytenr = bytenr;
+ extent_op->num_bytes = num_bytes;
+ extent_op->parent = parent;
+ extent_op->orig_parent = orig_parent;
+ extent_op->generation = ref_generation;
+ extent_op->orig_generation = orig_generation;
+ extent_op->level = (int)owner_objectid;
+
+ set_extent_bits(&root->fs_info->extent_ins,
+ bytenr, bytenr + num_bytes - 1,
+ EXTENT_LOCKED, GFP_NOFS);
+ set_state_private(&root->fs_info->extent_ins,
+ bytenr, (unsigned long)extent_op);
+ }
+ return 0;
+ }
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+ ret = lookup_extent_backref(trans, extent_root, path,
+ bytenr, orig_parent, orig_root,
+ orig_generation, 1);
+ if (ret)
+ goto out;
+ ret = remove_extent_backref(trans, extent_root, path);
+ if (ret)
+ goto out;
+ ret = insert_extent_backref(trans, extent_root, path, bytenr,
+ parent, ref_root, ref_generation,
+ owner_objectid, owner_offset);
+ BUG_ON(ret);
+ finish_current_insert(trans, extent_root);
+ del_pending_extents(trans, extent_root);
+out:
+ btrfs_free_path(path);
+ return ret;
+}
+
+int btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 bytenr,
+ u64 orig_parent, u64 parent,
+ u64 ref_root, u64 ref_generation,
+ u64 owner_objectid, u64 owner_offset)
+{
+ int ret;
+ if (ref_root == BTRFS_TREE_LOG_OBJECTID &&
+ owner_objectid < BTRFS_FIRST_FREE_OBJECTID)
+ return 0;
+ maybe_lock_mutex(root);
+ ret = __btrfs_update_extent_ref(trans, root, bytenr, orig_parent,
+ parent, ref_root, ref_root,
+ ref_generation, ref_generation,
+ owner_objectid, owner_offset);
+ maybe_unlock_mutex(root);
+ return ret;
+}
+
+static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 bytenr,
+ u64 orig_parent, u64 parent,
+ u64 orig_root, u64 ref_root,
+ u64 orig_generation, u64 ref_generation,
+ u64 owner_objectid, u64 owner_offset)
{
struct btrfs_path *path;
int ret;
struct btrfs_extent_item *item;
u32 refs;
- WARN_ON(num_bytes < root->sectorsize);
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
+ path->reada = 1;
key.objectid = bytenr;
- btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
- key.offset = num_bytes;
+ key.type = BTRFS_EXTENT_ITEM_KEY;
+ key.offset = (u64)-1;
+
ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path,
0, 1);
if (ret < 0)
return ret;
- if (ret != 0) {
- BUG();
- }
- BUG_ON(ret != 0);
+ BUG_ON(ret == 0 || path->slots[0] == 0);
+
+ path->slots[0]--;
l = path->nodes[0];
+
+ btrfs_item_key_to_cpu(l, &key, path->slots[0]);
+ BUG_ON(key.objectid != bytenr);
+ BUG_ON(key.type != BTRFS_EXTENT_ITEM_KEY);
+
item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item);
refs = btrfs_extent_refs(l, item);
btrfs_set_extent_refs(l, item, refs + 1);
btrfs_release_path(root->fs_info->extent_root, path);
- ret = btrfs_insert_extent_backref(trans, root->fs_info->extent_root,
- path, bytenr, root_objectid,
- ref_generation, owner, owner_offset);
+ path->reada = 1;
+ ret = insert_extent_backref(trans, root->fs_info->extent_root,
+ path, bytenr, parent,
+ ref_root, ref_generation,
+ owner_objectid, owner_offset);
BUG_ON(ret);
finish_current_insert(trans, root->fs_info->extent_root);
del_pending_extents(trans, root->fs_info->extent_root);
return 0;
}
+int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 bytenr, u64 num_bytes, u64 parent,
+ u64 ref_root, u64 ref_generation,
+ u64 owner_objectid, u64 owner_offset)
+{
+ int ret;
+ if (ref_root == BTRFS_TREE_LOG_OBJECTID &&
+ owner_objectid < BTRFS_FIRST_FREE_OBJECTID)
+ return 0;
+ maybe_lock_mutex(root);
+ ret = __btrfs_inc_extent_ref(trans, root, bytenr, 0, parent,
+ 0, ref_root, 0, ref_generation,
+ owner_objectid, owner_offset);
+ maybe_unlock_mutex(root);
+ return ret;
+}
+
int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
return 0;
}
-static int lookup_extent_ref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, u64 bytenr,
- u64 num_bytes, u32 *refs)
+int lookup_extent_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 bytenr,
+ u64 num_bytes, u32 *refs)
{
struct btrfs_path *path;
int ret;
WARN_ON(num_bytes < root->sectorsize);
path = btrfs_alloc_path();
+ path->reada = 1;
key.objectid = bytenr;
key.offset = num_bytes;
btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
goto out;
if (ret != 0) {
btrfs_print_leaf(root, path->nodes[0]);
- printk("failed to find block number %llu\n",
- (unsigned long long)bytenr);
+ printk("failed to find block number %Lu\n", bytenr);
BUG();
}
l = path->nodes[0];
return 0;
}
-u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
- struct btrfs_path *count_path,
- u64 first_extent)
-{
- struct btrfs_root *extent_root = root->fs_info->extent_root;
- struct btrfs_path *path;
- u64 bytenr;
- u64 found_objectid;
- u64 root_objectid = root->root_key.objectid;
- u32 total_count = 0;
- u32 cur_count;
- u32 refs;
- u32 nritems;
- int ret;
- struct btrfs_key key;
- struct btrfs_key found_key;
- struct extent_buffer *l;
- struct btrfs_extent_item *item;
- struct btrfs_extent_ref *ref_item;
- int level = -1;
-
- path = btrfs_alloc_path();
-again:
- if (level == -1)
- bytenr = first_extent;
- else
- bytenr = count_path->nodes[level]->start;
-
- cur_count = 0;
- key.objectid = bytenr;
- key.offset = 0;
-
- btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
- ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
- if (ret < 0)
- goto out;
- BUG_ON(ret == 0);
-
- l = path->nodes[0];
- btrfs_item_key_to_cpu(l, &found_key, path->slots[0]);
-
- if (found_key.objectid != bytenr ||
- found_key.type != BTRFS_EXTENT_ITEM_KEY) {
- goto out;
- }
-
- item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item);
- refs = btrfs_extent_refs(l, item);
- while (1) {
- nritems = btrfs_header_nritems(l);
- if (path->slots[0] >= nritems) {
- ret = btrfs_next_leaf(extent_root, path);
- if (ret == 0)
- continue;
- break;
- }
- btrfs_item_key_to_cpu(l, &found_key, path->slots[0]);
- if (found_key.objectid != bytenr)
- break;
- if (found_key.type != BTRFS_EXTENT_REF_KEY) {
- path->slots[0]++;
- continue;
- }
-
- cur_count++;
- ref_item = btrfs_item_ptr(l, path->slots[0],
- struct btrfs_extent_ref);
- found_objectid = btrfs_ref_root(l, ref_item);
-
- if (found_objectid != root_objectid) {
- total_count = 2;
- goto out;
- }
- total_count = 1;
- path->slots[0]++;
- }
- if (cur_count == 0) {
- total_count = 0;
- goto out;
- }
- if (level >= 0 && root->node == count_path->nodes[level])
- goto out;
- level++;
- btrfs_release_path(root, path);
- goto again;
-
-out:
- btrfs_free_path(path);
- return total_count;
-}
-int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, u64 owner_objectid)
-{
- u64 generation;
- u64 key_objectid;
- u64 level;
- u32 nritems;
- struct btrfs_disk_key disk_key;
-
- level = btrfs_header_level(root->node);
- generation = trans->transid;
- nritems = btrfs_header_nritems(root->node);
- if (nritems > 0) {
- if (level == 0)
- btrfs_item_key(root->node, &disk_key, 0);
- else
- btrfs_node_key(root->node, &disk_key, 0);
- key_objectid = btrfs_disk_key_objectid(&disk_key);
- } else {
- key_objectid = 0;
- }
- return btrfs_inc_extent_ref(trans, root, root->node->start,
- root->node->len, owner_objectid,
- generation, level, key_objectid);
-}
-
int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
- struct extent_buffer *buf)
+ struct extent_buffer *orig_buf, struct extent_buffer *buf,
+ u32 *nr_extents)
{
u64 bytenr;
+ u64 ref_root;
+ u64 orig_root;
+ u64 ref_generation;
+ u64 orig_generation;
u32 nritems;
+ u32 nr_file_extents = 0;
struct btrfs_key key;
struct btrfs_file_extent_item *fi;
int i;
int level;
- int ret;
- int faili;
+ int ret = 0;
+ int faili = 0;
+ int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *,
+ u64, u64, u64, u64, u64, u64, u64, u64, u64);
- if (!root->ref_cows)
- return 0;
+ ref_root = btrfs_header_owner(buf);
+ ref_generation = btrfs_header_generation(buf);
+ orig_root = btrfs_header_owner(orig_buf);
+ orig_generation = btrfs_header_generation(orig_buf);
- level = btrfs_header_level(buf);
nritems = btrfs_header_nritems(buf);
+ level = btrfs_header_level(buf);
+
+ if (root->ref_cows) {
+ process_func = __btrfs_inc_extent_ref;
+ } else {
+ if (level == 0 &&
+ root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID)
+ goto out;
+ process_func = __btrfs_update_extent_ref;
+ }
+
for (i = 0; i < nritems; i++) {
+ cond_resched();
if (level == 0) {
- u64 disk_bytenr;
btrfs_item_key_to_cpu(buf, &key, i);
if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
continue;
if (btrfs_file_extent_type(buf, fi) ==
BTRFS_FILE_EXTENT_INLINE)
continue;
- disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi);
- if (disk_bytenr == 0)
+ bytenr = btrfs_file_extent_disk_bytenr(buf, fi);
+ if (bytenr == 0)
continue;
- ret = btrfs_inc_extent_ref(trans, root, disk_bytenr,
- btrfs_file_extent_disk_num_bytes(buf, fi),
- root->root_key.objectid, trans->transid,
- key.objectid, key.offset);
+
+ nr_file_extents++;
+
+ maybe_lock_mutex(root);
+ ret = process_func(trans, root, bytenr,
+ orig_buf->start, buf->start,
+ orig_root, ref_root,
+ orig_generation, ref_generation,
+ key.objectid, key.offset);
+ maybe_unlock_mutex(root);
+
if (ret) {
faili = i;
+ WARN_ON(1);
goto fail;
}
} else {
bytenr = btrfs_node_blockptr(buf, i);
- btrfs_node_key_to_cpu(buf, &key, i);
- ret = btrfs_inc_extent_ref(trans, root, bytenr,
- btrfs_level_size(root, level - 1),
- root->root_key.objectid,
- trans->transid,
- level - 1, key.objectid);
+ maybe_lock_mutex(root);
+ ret = process_func(trans, root, bytenr,
+ orig_buf->start, buf->start,
+ orig_root, ref_root,
+ orig_generation, ref_generation,
+ level - 1, 0);
+ maybe_unlock_mutex(root);
if (ret) {
faili = i;
+ WARN_ON(1);
goto fail;
}
}
}
+out:
+ if (nr_extents) {
+ if (level == 0)
+ *nr_extents = nr_file_extents;
+ else
+ *nr_extents = nritems;
+ }
return 0;
fail:
WARN_ON(1);
return ret;
}
+int btrfs_update_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct extent_buffer *orig_buf,
+ struct extent_buffer *buf, int start_slot, int nr)
+
+{
+ u64 bytenr;
+ u64 ref_root;
+ u64 orig_root;
+ u64 ref_generation;
+ u64 orig_generation;
+ struct btrfs_key key;
+ struct btrfs_file_extent_item *fi;
+ int i;
+ int ret;
+ int slot;
+ int level;
+
+ BUG_ON(start_slot < 0);
+ BUG_ON(start_slot + nr > btrfs_header_nritems(buf));
+
+ ref_root = btrfs_header_owner(buf);
+ ref_generation = btrfs_header_generation(buf);
+ orig_root = btrfs_header_owner(orig_buf);
+ orig_generation = btrfs_header_generation(orig_buf);
+ level = btrfs_header_level(buf);
+
+ if (!root->ref_cows) {
+ if (level == 0 &&
+ root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID)
+ return 0;
+ }
+
+ for (i = 0, slot = start_slot; i < nr; i++, slot++) {
+ cond_resched();
+ if (level == 0) {
+ btrfs_item_key_to_cpu(buf, &key, slot);
+ if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
+ continue;
+ fi = btrfs_item_ptr(buf, slot,
+ struct btrfs_file_extent_item);
+ if (btrfs_file_extent_type(buf, fi) ==
+ BTRFS_FILE_EXTENT_INLINE)
+ continue;
+ bytenr = btrfs_file_extent_disk_bytenr(buf, fi);
+ if (bytenr == 0)
+ continue;
+
+ maybe_lock_mutex(root);
+ ret = __btrfs_update_extent_ref(trans, root, bytenr,
+ orig_buf->start, buf->start,
+ orig_root, ref_root,
+ orig_generation, ref_generation,
+ key.objectid, key.offset);
+ maybe_unlock_mutex(root);
+ if (ret)
+ goto fail;
+ } else {
+ bytenr = btrfs_node_blockptr(buf, slot);
+ maybe_lock_mutex(root);
+ ret = __btrfs_update_extent_ref(trans, root, bytenr,
+ orig_buf->start, buf->start,
+ orig_root, ref_root,
+ orig_generation, ref_generation,
+ level - 1, 0);
+ maybe_unlock_mutex(root);
+ if (ret)
+ goto fail;
+ }
+ }
+ return 0;
+fail:
+ WARN_ON(1);
+ return -1;
+}
+
static int write_one_cache_group(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
{
u64 start;
u64 end;
+ u64 priv;
struct btrfs_fs_info *info = extent_root->fs_info;
- struct extent_buffer *eb;
struct btrfs_path *path;
- struct btrfs_key ins;
- struct btrfs_disk_key first;
+ struct btrfs_extent_ref *ref;
+ struct pending_extent_op *extent_op;
+ struct btrfs_key key;
struct btrfs_extent_item extent_item;
int ret;
- int level;
int err = 0;
btrfs_set_stack_extent_refs(&extent_item, 1);
- btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY);
path = btrfs_alloc_path();
while(1) {
if (ret)
break;
- ins.objectid = start;
- ins.offset = end + 1 - start;
- err = btrfs_insert_item(trans, extent_root, &ins,
+ ret = get_state_private(&info->extent_ins, start, &priv);
+ BUG_ON(ret);
+ extent_op = (struct pending_extent_op *)(unsigned long)priv;
+
+ if (extent_op->type == PENDING_EXTENT_INSERT) {
+ key.objectid = start;
+ key.offset = end + 1 - start;
+ key.type = BTRFS_EXTENT_ITEM_KEY;
+ err = btrfs_insert_item(trans, extent_root, &key,
&extent_item, sizeof(extent_item));
- clear_extent_bits(&info->extent_ins, start, end, EXTENT_LOCKED,
- GFP_NOFS);
- eb = read_tree_block(extent_root, ins.objectid, ins.offset,
- trans->transid);
- level = btrfs_header_level(eb);
- if (level == 0) {
- btrfs_item_key(eb, &first, 0);
+ BUG_ON(err);
+
+ clear_extent_bits(&info->extent_ins, start, end,
+ EXTENT_LOCKED, GFP_NOFS);
+
+ err = insert_extent_backref(trans, extent_root, path,
+ start, extent_op->parent,
+ extent_root->root_key.objectid,
+ extent_op->generation,
+ extent_op->level, 0);
+ BUG_ON(err);
+ } else if (extent_op->type == PENDING_BACKREF_UPDATE) {
+ err = lookup_extent_backref(trans, extent_root, path,
+ start, extent_op->orig_parent,
+ extent_root->root_key.objectid,
+ extent_op->orig_generation, 0);
+ BUG_ON(err);
+
+ clear_extent_bits(&info->extent_ins, start, end,
+ EXTENT_LOCKED, GFP_NOFS);
+
+ key.objectid = start;
+ key.offset = extent_op->parent;
+ key.type = BTRFS_EXTENT_REF_KEY;
+ err = btrfs_set_item_key_safe(trans, extent_root, path,
+ &key);
+ BUG_ON(err);
+ ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
+ struct btrfs_extent_ref);
+ btrfs_set_ref_generation(path->nodes[0], ref,
+ extent_op->generation);
+ btrfs_mark_buffer_dirty(path->nodes[0]);
+ btrfs_release_path(extent_root, path);
} else {
- btrfs_node_key(eb, &first, 0);
+ BUG_ON(1);
}
- err = btrfs_insert_extent_backref(trans, extent_root, path,
- start, extent_root->root_key.objectid,
- 0, level,
- btrfs_disk_key_objectid(&first));
- BUG_ON(err);
- free_extent_buffer(eb);
+ kfree(extent_op);
}
btrfs_free_path(path);
return 0;
}
-static int pin_down_bytes(struct btrfs_root *root, u64 bytenr, u32 num_bytes,
- int pending)
+static int pin_down_bytes(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 bytenr, u64 num_bytes, int is_data)
{
int err = 0;
struct extent_buffer *buf;
- if (!pending) {
- buf = btrfs_find_tree_block(root, bytenr, num_bytes);
- if (buf) {
- if (btrfs_buffer_uptodate(buf, 0)) {
- u64 transid =
- root->fs_info->running_transaction->transid;
- if (btrfs_header_generation(buf) ==
- transid && !btrfs_header_flag(buf,
- BTRFS_HEADER_FLAG_WRITTEN)) {
- free_extent_buffer(buf);
- return 1;
- }
- }
+ if (is_data)
+ goto pinit;
+
+ buf = btrfs_find_tree_block(root, bytenr, num_bytes);
+ if (!buf)
+ goto pinit;
+
+ /* 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)) {
+ u64 header_owner = btrfs_header_owner(buf);
+ u64 header_transid = btrfs_header_generation(buf);
+ if (header_owner != BTRFS_TREE_LOG_OBJECTID &&
+ header_owner != BTRFS_TREE_RELOC_OBJECTID &&
+ header_transid == trans->transid &&
+ !btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) {
+ clean_tree_block(NULL, root, buf);
free_extent_buffer(buf);
+ return 1;
}
- update_pinned_extents(root, bytenr, num_bytes, 1);
- } else {
- set_extent_bits(&root->fs_info->pending_del,
- bytenr, bytenr + num_bytes - 1,
- EXTENT_LOCKED, GFP_NOFS);
}
+ free_extent_buffer(buf);
+pinit:
+ update_pinned_extents(root, bytenr, num_bytes, 1);
+
BUG_ON(err < 0);
return 0;
}
* remove an extent from the root, returns 0 on success
*/
static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, u64 bytenr, u64 num_bytes,
+ *root, u64 bytenr, u64 num_bytes, u64 parent,
u64 root_objectid, u64 ref_generation,
u64 owner_objectid, u64 owner_offset, int pin,
int mark_free)
if (!path)
return -ENOMEM;
- ret = lookup_extent_backref(trans, extent_root, path,
- bytenr, root_objectid,
- ref_generation,
- owner_objectid, owner_offset, 1);
+ ret = lookup_extent_backref(trans, extent_root, path, bytenr, parent,
+ root_objectid, ref_generation, 1);
if (ret == 0) {
struct btrfs_key found_key;
extent_slot = path->slots[0];
if (path->slots[0] - extent_slot > 5)
break;
}
- if (!found_extent)
- ret = btrfs_del_item(trans, extent_root, path);
+ if (!found_extent) {
+ ret = remove_extent_backref(trans, extent_root, path);
+ BUG_ON(ret);
+ btrfs_release_path(extent_root, path);
+ ret = btrfs_search_slot(trans, extent_root,
+ &key, path, -1, 1);
+ BUG_ON(ret);
+ extent_slot = path->slots[0];
+ }
} else {
btrfs_print_leaf(extent_root, path->nodes[0]);
- WARN_ON(1);
printk("Unable to find ref byte nr %llu root %llu "
" gen %llu owner %llu offset %llu\n",
(unsigned long long)bytenr,
(unsigned long long)ref_generation,
(unsigned long long)owner_objectid,
(unsigned long long)owner_offset);
- }
- if (!found_extent) {
- btrfs_release_path(extent_root, path);
- ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1);
- if (ret < 0)
- return ret;
- BUG_ON(ret);
- extent_slot = path->slots[0];
+ BUG_ON(1);
}
leaf = path->nodes[0];
btrfs_mark_buffer_dirty(leaf);
if (refs == 0 && found_extent && path->slots[0] == extent_slot + 1) {
+ struct btrfs_extent_ref *ref;
+ ref = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_extent_ref);
+ BUG_ON(btrfs_ref_num_refs(leaf, ref) != 1);
/* if the back ref and the extent are next to each other
* they get deleted below in one shot
*/
num_to_del = 2;
} else if (found_extent) {
/* otherwise delete the extent back ref */
- ret = btrfs_del_item(trans, extent_root, path);
+ ret = remove_extent_backref(trans, extent_root, path);
BUG_ON(ret);
/* if refs are 0, we need to setup the path for deletion */
if (refs == 0) {
u64 root_used;
if (pin) {
- ret = pin_down_bytes(root, bytenr, num_bytes, 0);
+ ret = pin_down_bytes(trans, root, bytenr, num_bytes, 0);
if (ret > 0)
mark_free = 1;
BUG_ON(ret < 0);
{
int ret;
int err = 0;
+ int mark_free = 0;
u64 start;
u64 end;
+ u64 priv;
struct extent_io_tree *pending_del;
- struct extent_io_tree *pinned_extents;
+ struct extent_io_tree *extent_ins;
+ struct pending_extent_op *extent_op;
+ extent_ins = &extent_root->fs_info->extent_ins;
pending_del = &extent_root->fs_info->pending_del;
- pinned_extents = &extent_root->fs_info->pinned_extents;
while(1) {
ret = find_first_extent_bit(pending_del, 0, &start, &end,
EXTENT_LOCKED);
if (ret)
break;
- update_pinned_extents(extent_root, start, end + 1 - start, 1);
+
+ ret = get_state_private(pending_del, start, &priv);
+ BUG_ON(ret);
+ extent_op = (struct pending_extent_op *)(unsigned long)priv;
+
clear_extent_bits(pending_del, start, end, EXTENT_LOCKED,
GFP_NOFS);
- ret = __free_extent(trans, extent_root,
- start, end + 1 - start,
- extent_root->root_key.objectid,
- 0, 0, 0, 0, 0);
+
+ ret = pin_down_bytes(trans, extent_root, start,
+ end + 1 - start, 0);
+ mark_free = ret > 0;
+ if (!test_range_bit(extent_ins, start, end,
+ EXTENT_LOCKED, 0)) {
+free_extent:
+ ret = __free_extent(trans, extent_root,
+ start, end + 1 - start,
+ extent_op->orig_parent,
+ extent_root->root_key.objectid,
+ extent_op->orig_generation,
+ extent_op->level, 0, 0, mark_free);
+ kfree(extent_op);
+ } else {
+ kfree(extent_op);
+ ret = get_state_private(extent_ins, start, &priv);
+ BUG_ON(ret);
+ extent_op = (struct pending_extent_op *)
+ (unsigned long)priv;
+
+ clear_extent_bits(extent_ins, start, end,
+ EXTENT_LOCKED, GFP_NOFS);
+
+ if (extent_op->type == PENDING_BACKREF_UPDATE)
+ goto free_extent;
+
+ ret = update_block_group(trans, extent_root, start,
+ end + 1 - start, 0, mark_free);
+ BUG_ON(ret);
+ kfree(extent_op);
+ }
if (ret)
err = ret;
}
* remove an extent from the root, returns 0 on success
*/
int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, u64 bytenr, u64 num_bytes,
+ *root, u64 bytenr, u64 num_bytes, u64 parent,
u64 root_objectid, u64 ref_generation,
u64 owner_objectid, u64 owner_offset, int pin)
{
int ret;
WARN_ON(num_bytes < root->sectorsize);
- if (!root->ref_cows)
- ref_generation = 0;
-
if (root == extent_root) {
- pin_down_bytes(root, bytenr, num_bytes, 1);
+ struct pending_extent_op *extent_op;
+
+ extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS);
+ BUG_ON(!extent_op);
+
+ extent_op->type = PENDING_EXTENT_DELETE;
+ extent_op->bytenr = bytenr;
+ extent_op->num_bytes = num_bytes;
+ extent_op->parent = parent;
+ extent_op->orig_parent = parent;
+ extent_op->generation = ref_generation;
+ extent_op->orig_generation = ref_generation;
+ extent_op->level = (int)owner_objectid;
+
+ set_extent_bits(&root->fs_info->pending_del,
+ bytenr, bytenr + num_bytes - 1,
+ EXTENT_LOCKED, GFP_NOFS);
+ set_state_private(&root->fs_info->pending_del,
+ bytenr, (unsigned long)extent_op);
return 0;
}
- ret = __free_extent(trans, root, bytenr, num_bytes, root_objectid,
- ref_generation, owner_objectid, owner_offset,
- pin, pin == 0);
+ ret = __free_extent(trans, root, bytenr, num_bytes, parent,
+ root_objectid, ref_generation,
+ owner_objectid, owner_offset, pin, pin == 0);
pending_ret = del_pending_extents(trans, root->fs_info->extent_root);
return ret ? ret : pending_ret;
}
*/
int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
- u64 num_bytes, u64 root_objectid, u64 ref_generation,
+ u64 num_bytes, u64 parent,
+ u64 root_objectid, u64 ref_generation,
u64 owner, u64 owner_offset,
u64 empty_size, u64 hint_byte,
u64 search_end, struct btrfs_key *ins, int data)
if (ret)
return ret;
+ if (parent == 0)
+ parent = ins->objectid;
+
/* block accounting for super block */
super_used = btrfs_super_bytes_used(&info->super_copy);
btrfs_set_super_bytes_used(&info->super_copy, super_used + num_bytes);
GFP_NOFS);
if (root == extent_root) {
+ struct pending_extent_op *extent_op;
+
+ extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS);
+ BUG_ON(!extent_op);
+
+ extent_op->type = PENDING_EXTENT_INSERT;
+ extent_op->bytenr = ins->objectid;
+ extent_op->num_bytes = ins->offset;
+ extent_op->parent = parent;
+ extent_op->orig_parent = 0;
+ extent_op->generation = ref_generation;
+ extent_op->orig_generation = 0;
+ extent_op->level = (int)owner;
+
set_extent_bits(&root->fs_info->extent_ins, ins->objectid,
ins->objectid + ins->offset - 1,
EXTENT_LOCKED, GFP_NOFS);
+ set_state_private(&root->fs_info->extent_ins,
+ ins->objectid, (unsigned long)extent_op);
goto update_block;
}
trans->alloc_exclude_nr = ins->offset;
memcpy(&keys[0], ins, sizeof(*ins));
- keys[1].offset = hash_extent_ref(root_objectid, ref_generation,
- owner, owner_offset);
keys[1].objectid = ins->objectid;
keys[1].type = BTRFS_EXTENT_REF_KEY;
+ keys[1].offset = parent;
sizes[0] = sizeof(*extent_item);
sizes[1] = sizeof(*ref);
btrfs_set_ref_generation(path->nodes[0], ref, ref_generation);
btrfs_set_ref_objectid(path->nodes[0], ref, owner);
btrfs_set_ref_offset(path->nodes[0], ref, owner_offset);
+ btrfs_set_ref_num_refs(path->nodes[0], ref, 1);
btrfs_mark_buffer_dirty(path->nodes[0]);
*/
struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
- u32 blocksize,
- u64 root_objectid, u64 hint,
- u64 empty_size)
-{
- u64 ref_generation;
-
- if (root->ref_cows)
- ref_generation = trans->transid;
- else
- ref_generation = 0;
-
-
- return __btrfs_alloc_free_block(trans, root, blocksize, root_objectid,
- ref_generation, 0, 0, hint, empty_size);
-}
-
-/*
- * helper function to allocate a block for a given tree
- * returns the tree buffer or NULL.
- */
-struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- u32 blocksize,
+ u32 blocksize, u64 parent,
u64 root_objectid,
u64 ref_generation,
- u64 first_objectid,
int level,
u64 hint,
u64 empty_size)
int ret;
struct extent_buffer *buf;
- ret = btrfs_alloc_extent(trans, root, blocksize,
+ ret = btrfs_alloc_extent(trans, root, blocksize, parent,
root_objectid, ref_generation,
- level, first_objectid, empty_size, hint,
+ level, 0, empty_size, hint,
(u64)-1, &ins, 0);
if (ret) {
BUG_ON(ret > 0);
}
buf = btrfs_find_create_tree_block(root, ins.objectid, blocksize);
if (!buf) {
+ if (parent == 0)
+ parent = ins.objectid;
btrfs_free_extent(trans, root, ins.objectid, blocksize,
- root->root_key.objectid, ref_generation,
- 0, 0, 0);
+ parent, root->root_key.objectid,
+ ref_generation, 0, 0, 0);
BUG_ON(1);
return ERR_PTR(-ENOMEM);
}
continue;
ret = btrfs_free_extent(trans, root, disk_bytenr,
btrfs_file_extent_disk_num_bytes(leaf, fi),
- leaf_owner, leaf_generation,
+ leaf->start, leaf_owner, leaf_generation,
key.objectid, key.offset, 0);
BUG_ON(ret);
}
root_owner = btrfs_header_owner(parent);
root_gen = btrfs_header_generation(parent);
path->slots[*level]++;
- ret = btrfs_free_extent(trans, root, bytenr,
- blocksize, root_owner,
+ ret = btrfs_free_extent(trans, root, bytenr, blocksize,
+ parent->start, root_owner,
root_gen, 0, 0, 1);
BUG_ON(ret);
continue;
path->slots[*level]++;
free_extent_buffer(next);
ret = btrfs_free_extent(trans, root, bytenr,
- blocksize,
- root_owner,
- root_gen, 0, 0, 1);
+ blocksize, parent->start,
+ root_owner, root_gen, 0, 0, 1);
BUG_ON(ret);
continue;
}
root_gen = btrfs_header_generation(parent);
ret = btrfs_free_extent(trans, root, path->nodes[*level]->start,
- path->nodes[*level]->len,
+ path->nodes[*level]->len, parent->start,
root_owner, root_gen, 0, 0, 1);
free_extent_buffer(path->nodes[*level]);
path->nodes[*level] = NULL;
root_item->drop_level = i;
return 0;
} else {
- if (path->nodes[*level] == root->node) {
- root_owner = root->root_key.objectid;
- root_gen =
- btrfs_header_generation(path->nodes[*level]);
- } else {
- struct extent_buffer *node;
- node = path->nodes[*level + 1];
- root_owner = btrfs_header_owner(node);
- root_gen = btrfs_header_generation(node);
- }
+ struct extent_buffer *parent;
+ if (path->nodes[*level] == root->node)
+ parent = path->nodes[*level];
+ else
+ parent = path->nodes[*level + 1];
+
+ root_owner = btrfs_header_owner(parent);
+ root_gen = btrfs_header_generation(parent);
ret = btrfs_free_extent(trans, root,
path->nodes[*level]->start,
path->nodes[*level]->len,
- root_owner, root_gen, 0, 0, 1);
+ parent->start, root_owner,
+ root_gen, 0, 0, 1);
BUG_ON(ret);
free_extent_buffer(path->nodes[*level]);
path->nodes[*level] = NULL;
return 0;
}
-u64 btrfs_hash_extent_ref(u64 root_objectid, u64 ref_generation,
- u64 owner, u64 owner_offset)
-{
- return hash_extent_ref(root_objectid, ref_generation,
- owner, owner_offset);
-}
-
int btrfs_update_block_group(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u64 num_bytes, int alloc,