*/
#include <linux/sched.h>
+#include <linux/crc32c.h>
#include "hash.h"
#include "ctree.h"
#include "disk-io.h"
btrfs_item_key_to_cpu(leaf, &key, slot);
if (key.objectid < block_group->key.objectid) {
- if (key.objectid + key.offset > first_free)
+ if (btrfs_key_type(&key) != BTRFS_EXTENT_REF_KEY &&
+ key.objectid + key.offset > first_free)
first_free = key.objectid + key.offset;
goto next;
}
return found_group;
}
-static u64 hash_extent_ref(u64 root_objectid, u64 root_generation,
+static u64 hash_extent_ref(u64 root_objectid, u64 ref_generation,
u64 owner, u64 owner_offset)
{
u32 high_crc = ~(u32)0;
lenum = cpu_to_le64(root_objectid);
high_crc = crc32c(high_crc, &lenum, sizeof(lenum));
- lenum = cpu_to_le64(root_generation);
- high_crc = crc32c(high_crc, &lenum, sizeof(lenum));
+ lenum = cpu_to_le64(ref_generation);
+ low_crc = crc32c(low_crc, &lenum, sizeof(lenum));
+#if 0
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));
-
+#endif
return ((u64)high_crc << 32) | (u64)low_crc;
}
-int insert_extent_ref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct btrfs_path *path,
- u64 bytenr,
- u64 root_objectid, u64 root_generation,
- u64 owner, u64 owner_offset)
+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 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 *l;
- struct btrfs_extent_item *item;
+ 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;
+}
+
+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)
+{
+ u64 hash;
+ struct btrfs_key key;
+ struct btrfs_extent_ref ref;
+ struct btrfs_extent_ref *disk_ref;
int ret;
btrfs_set_stack_ref_root(&ref, root_objectid);
- btrfs_set_stack_ref_generation(&ref, root_generation);
+ btrfs_set_stack_ref_generation(&ref, ref_generation);
btrfs_set_stack_ref_objectid(&ref, owner);
btrfs_set_stack_ref_offset(&ref, owner_offset);
- ret = btrfs_name_hash(&ref, sizeof(ref), &hash);
+ hash = hash_extent_ref(root_objectid, ref_generation, owner,
+ owner_offset);
key.offset = hash;
key.objectid = bytenr;
key.type = BTRFS_EXTENT_REF_KEY;
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))
+ goto out;
+ key.offset++;
+ btrfs_release_path(root, path);
+ ret = btrfs_insert_empty_item(trans, root, path, &key,
+ sizeof(ref));
}
-
+ if (ret)
+ 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 root_generation,
+ u64 root_objectid, u64 ref_generation,
u64 owner, u64 owner_offset)
{
struct btrfs_path *path;
btrfs_mark_buffer_dirty(path->nodes[0]);
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);
+ BUG_ON(ret);
finish_current_insert(trans, root->fs_info->extent_root);
del_pending_extents(trans, root->fs_info->extent_root);
}
int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root)
+ 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);
+ root->node->len, owner_objectid,
+ generation, 0, 0);
}
int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
int level;
int ret;
int faili;
- int err;
if (!root->ref_cows)
return 0;
if (disk_bytenr == 0)
continue;
ret = btrfs_inc_extent_ref(trans, root, disk_bytenr,
- btrfs_file_extent_disk_num_bytes(buf, fi));
+ btrfs_file_extent_disk_num_bytes(buf, fi),
+ root->root_key.objectid, trans->transid,
+ key.objectid, key.offset);
if (ret) {
faili = i;
goto fail;
} else {
bytenr = btrfs_node_blockptr(buf, i);
ret = btrfs_inc_extent_ref(trans, root, bytenr,
- btrfs_level_size(root, level - 1));
+ btrfs_level_size(root, level - 1),
+ root->root_key.objectid,
+ trans->transid, 0, 0);
if (ret) {
faili = i;
goto fail;
return 0;
fail:
WARN_ON(1);
+#if 0
for (i =0; i < faili; i++) {
if (level == 0) {
u64 disk_bytenr;
BUG_ON(err);
}
}
+#endif
return ret;
}
static int finish_current_insert(struct btrfs_trans_handle *trans, struct
btrfs_root *extent_root)
{
+ u64 start;
+ u64 end;
+ struct btrfs_fs_info *info = extent_root->fs_info;
+ struct btrfs_path *path;
struct btrfs_key ins;
struct btrfs_extent_item extent_item;
int ret;
int err = 0;
- u64 start;
- u64 end;
- struct btrfs_fs_info *info = extent_root->fs_info;
btrfs_set_stack_extent_refs(&extent_item, 1);
btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY);
- btrfs_set_stack_extent_owner(&extent_item,
- extent_root->root_key.objectid);
+ path = btrfs_alloc_path();
while(1) {
ret = find_first_extent_bit(&info->extent_ins, 0, &start,
&extent_item, sizeof(extent_item));
clear_extent_bits(&info->extent_ins, start, end, EXTENT_LOCKED,
GFP_NOFS);
+ err = btrfs_insert_extent_backref(trans, extent_root, path,
+ start, extent_root->root_key.objectid,
+ 0, 0, 0);
+ BUG_ON(err);
}
+ btrfs_free_path(path);
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, int pin,
+ *root, u64 bytenr, u64 num_bytes,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner_objectid, u64 owner_offset, int pin,
int mark_free)
{
struct btrfs_path *path;
if (!path)
return -ENOMEM;
+ if (ref_generation && owner_objectid == 0 && root_objectid == 3) {
+//printk("drop backref root %Lu gen %Lu byte %Lu\n", root_objectid, ref_generation, bytenr );
+ }
+ ret = lookup_extent_backref(trans, extent_root, path,
+ bytenr, root_objectid,
+ ref_generation,
+ owner_objectid, owner_offset, 1);
+ if (ret == 0) {
+ ret = btrfs_del_item(trans, extent_root, path);
+ } else {
+ btrfs_print_leaf(extent_root, path->nodes[0]);
+ WARN_ON(1);
+ printk("Unable to find ref byte nr %Lu root %Lu "
+ " gen %Lu owner %Lu offset %Lu\n", bytenr,
+ root_objectid, ref_generation, owner_objectid,
+ owner_offset);
+ }
+ btrfs_release_path(extent_root, path);
ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1);
if (ret < 0)
return ret;
clear_extent_bits(pending_del, start, end, EXTENT_LOCKED,
GFP_NOFS);
ret = __free_extent(trans, extent_root,
- start, end + 1 - start, 0, 0);
+ start, end + 1 - start,
+ extent_root->root_key.objectid,
+ 0, 0, 0, 0, 0);
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, int pin)
+ *root, u64 bytenr, u64 num_bytes,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner_objectid, u64 owner_offset, int pin)
{
struct btrfs_root *extent_root = root->fs_info->extent_root;
int pending_ret;
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);
return 0;
}
- ret = __free_extent(trans, root, bytenr, num_bytes, pin, pin == 0);
+ ret = __free_extent(trans, root, bytenr, num_bytes, 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;
}
btrfs_item_key_to_cpu(l, &key, path->slots[0]);
/*
- * a rare case, go back one key if we hit a block group item
- * instead of an extent item
+ * walk backwards to find the first extent item key
*/
- if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY &&
- key.objectid + key.offset >= search_start) {
- ins->objectid = key.objectid;
- ins->offset = key.offset - 1;
- btrfs_release_path(root, path);
- ret = btrfs_search_slot(trans, root, ins, path, 0, 0);
- if (ret < 0)
- goto error;
-
- if (path->slots[0] > 0) {
+ while(btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY) {
+ if (path->slots[0] == 0) {
+ ret = btrfs_prev_leaf(root, path);
+ if (ret != 0) {
+ ret = btrfs_search_slot(trans, root, ins,
+ path, 0, 0);
+ if (ret < 0)
+ goto error;
+ if (path->slots[0] > 0)
+ path->slots[0]--;
+ break;
+ }
+ } else {
path->slots[0]--;
}
+ l = path->nodes[0];
+ btrfs_item_key_to_cpu(l, &key, path->slots[0]);
}
-
while (1) {
l = path->nodes[0];
slot = path->slots[0];
}
}
if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY) {
- if (!start_found) {
+ if (!start_found && btrfs_key_type(&key) ==
+ BTRFS_BLOCK_GROUP_ITEM_KEY) {
last_byte = key.objectid;
start_found = 1;
}
* returns 0 if everything worked, non-zero otherwise.
*/
int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, u64 owner,
- u64 num_bytes, u64 empty_size, u64 hint_byte,
+ struct btrfs_root *root,
+ u64 num_bytes, 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)
{
int ret;
struct btrfs_fs_info *info = root->fs_info;
struct btrfs_root *extent_root = info->extent_root;
struct btrfs_extent_item extent_item;
+ struct btrfs_path *path;
btrfs_set_stack_extent_refs(&extent_item, 1);
- btrfs_set_stack_extent_owner(&extent_item, owner);
WARN_ON(num_bytes < root->sectorsize);
ret = find_free_extent(trans, root, num_bytes, empty_size,
trans->alloc_exclude_start = 0;
trans->alloc_exclude_nr = 0;
+ BUG_ON(ret);
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ ret = btrfs_insert_extent_backref(trans, extent_root, path,
+ ins->objectid, root_objectid,
+ ref_generation, owner, owner_offset);
BUG_ON(ret);
+ btrfs_free_path(path);
finish_current_insert(trans, extent_root);
pending_ret = del_pending_extents(trans, extent_root);
*/
struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
- u32 blocksize, u64 hint,
+ 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,
+ u64 root_objectid,
+ u64 ref_generation,
+ u64 first_objectid,
+ int level,
+ u64 hint,
u64 empty_size)
{
struct btrfs_key ins;
int ret;
struct extent_buffer *buf;
- ret = btrfs_alloc_extent(trans, root, root->root_key.objectid,
- blocksize, empty_size, hint,
+ ret = btrfs_alloc_extent(trans, root, blocksize,
+ root_objectid, ref_generation,
+ first_objectid, level, 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) {
- btrfs_free_extent(trans, root, ins.objectid, blocksize, 0);
+ btrfs_free_extent(trans, root, ins.objectid, blocksize,
+ root->root_key.objectid, ref_generation,
+ 0, 0, 0);
return ERR_PTR(-ENOMEM);
}
btrfs_set_buffer_uptodate(buf);
static int drop_leaf_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct extent_buffer *leaf)
{
+ u64 leaf_owner;
+ u64 leaf_generation;
struct btrfs_key key;
struct btrfs_file_extent_item *fi;
int i;
BUG_ON(!btrfs_is_leaf(leaf));
nritems = btrfs_header_nritems(leaf);
+ leaf_owner = btrfs_header_owner(leaf);
+ leaf_generation = btrfs_header_generation(leaf);
+
for (i = 0; i < nritems; i++) {
u64 disk_bytenr;
if (disk_bytenr == 0)
continue;
ret = btrfs_free_extent(trans, root, disk_bytenr,
- btrfs_file_extent_disk_num_bytes(leaf, fi), 0);
+ btrfs_file_extent_disk_num_bytes(leaf, fi),
+ leaf_owner, leaf_generation,
+ key.objectid, key.offset, 0);
BUG_ON(ret);
}
return 0;
static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, int *level)
{
+ u64 root_owner;
+ u64 root_gen;
+ u64 bytenr;
struct extent_buffer *next;
struct extent_buffer *cur;
- u64 bytenr;
+ struct extent_buffer *parent;
u32 blocksize;
int ret;
u32 refs;
ret = lookup_extent_ref(trans, root, bytenr, blocksize, &refs);
BUG_ON(ret);
if (refs != 1) {
+ parent = path->nodes[*level];
+ root_owner = btrfs_header_owner(parent);
+ root_gen = btrfs_header_generation(parent);
path->slots[*level]++;
ret = btrfs_free_extent(trans, root, bytenr,
- blocksize, 1);
+ blocksize, root_owner,
+ root_gen, 0, 0, 1);
BUG_ON(ret);
continue;
}
blocksize, &refs);
BUG_ON(ret);
if (refs != 1) {
+ parent = path->nodes[*level];
+ root_owner = btrfs_header_owner(parent);
+ root_gen = btrfs_header_generation(parent);
+
path->slots[*level]++;
free_extent_buffer(next);
- ret = btrfs_free_extent(trans, root,
- bytenr, blocksize, 1);
+ ret = btrfs_free_extent(trans, root, bytenr,
+ blocksize,
+ root_owner,
+ root_gen, 0, 0, 1);
BUG_ON(ret);
continue;
}
out:
WARN_ON(*level < 0);
WARN_ON(*level >= BTRFS_MAX_LEVEL);
+
+ if (path->nodes[*level] == root->node) {
+ root_owner = root->root_key.objectid;
+ 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, 1);
+ path->nodes[*level]->len,
+ root_owner, root_gen, 0, 0, 1);
free_extent_buffer(path->nodes[*level]);
path->nodes[*level] = NULL;
*level += 1;
static int walk_up_tree(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, int *level)
{
+ u64 root_owner;
+ u64 root_gen;
+ struct btrfs_root_item *root_item = &root->root_item;
int i;
int slot;
int ret;
- struct btrfs_root_item *root_item = &root->root_item;
for(i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) {
slot = path->slots[i];
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);
+ }
ret = btrfs_free_extent(trans, root,
path->nodes[*level]->start,
- path->nodes[*level]->len, 1);
+ path->nodes[*level]->len,
+ root_owner, root_gen, 0, 0, 1);
BUG_ON(ret);
free_extent_buffer(path->nodes[*level]);
path->nodes[*level] = NULL;
projects / linux-2.6-block.git / blobdiff