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Diffstat (limited to 'fs/btrfs/ctree.c')
-rw-r--r--fs/btrfs/ctree.c233
1 files changed, 48 insertions, 185 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 118ad4d2cb..35c1d24d4a 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -230,9 +230,9 @@ noinline void btrfs_release_path(struct btrfs_path *p)
* cause could be a bug, eg. due to ENOSPC, and not for common errors that are
* caused by external factors.
*/
-bool __cold abort_should_print_stack(int errno)
+bool __cold abort_should_print_stack(int error)
{
- switch (errno) {
+ switch (error) {
case -EIO:
case -EROFS:
case -ENOMEM:
@@ -316,6 +316,7 @@ int btrfs_copy_root(struct btrfs_trans_handle *trans,
int ret = 0;
int level;
struct btrfs_disk_key disk_key;
+ u64 reloc_src_root = 0;
WARN_ON(test_bit(BTRFS_ROOT_SHAREABLE, &root->state) &&
trans->transid != fs_info->running_transaction->transid);
@@ -328,9 +329,11 @@ int btrfs_copy_root(struct btrfs_trans_handle *trans,
else
btrfs_node_key(buf, &disk_key, 0);
+ if (new_root_objectid == BTRFS_TREE_RELOC_OBJECTID)
+ reloc_src_root = btrfs_header_owner(buf);
cow = btrfs_alloc_tree_block(trans, root, 0, new_root_objectid,
&disk_key, level, buf->start, 0,
- BTRFS_NESTING_NEW_ROOT);
+ reloc_src_root, BTRFS_NESTING_NEW_ROOT);
if (IS_ERR(cow))
return PTR_ERR(cow);
@@ -429,7 +432,7 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
if (btrfs_block_can_be_shared(trans, root, buf)) {
ret = btrfs_lookup_extent_info(trans, fs_info, buf->start,
btrfs_header_level(buf), 1,
- &refs, &flags);
+ &refs, &flags, NULL);
if (ret)
return ret;
if (unlikely(refs == 0)) {
@@ -518,13 +521,13 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
* bytes the allocator should try to find free next to the block it returns.
* This is just a hint and may be ignored by the allocator.
*/
-static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct extent_buffer *buf,
- struct extent_buffer *parent, int parent_slot,
- struct extent_buffer **cow_ret,
- u64 search_start, u64 empty_size,
- enum btrfs_lock_nesting nest)
+int btrfs_force_cow_block(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *buf,
+ struct extent_buffer *parent, int parent_slot,
+ struct extent_buffer **cow_ret,
+ u64 search_start, u64 empty_size,
+ enum btrfs_lock_nesting nest)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_disk_key disk_key;
@@ -533,6 +536,7 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
int last_ref = 0;
int unlock_orig = 0;
u64 parent_start = 0;
+ u64 reloc_src_root = 0;
if (*cow_ret == buf)
unlock_orig = 1;
@@ -551,12 +555,14 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
else
btrfs_node_key(buf, &disk_key, 0);
- if ((root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) && parent)
- parent_start = parent->start;
-
+ if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) {
+ if (parent)
+ parent_start = parent->start;
+ reloc_src_root = btrfs_header_owner(buf);
+ }
cow = btrfs_alloc_tree_block(trans, root, parent_start,
root->root_key.objectid, &disk_key, level,
- search_start, empty_size, nest);
+ search_start, empty_size, reloc_src_root, nest);
if (IS_ERR(cow))
return PTR_ERR(cow);
@@ -679,11 +685,11 @@ static inline int should_cow_block(struct btrfs_trans_handle *trans,
}
/*
- * cows a single block, see __btrfs_cow_block for the real work.
+ * COWs a single block, see btrfs_force_cow_block() for the real work.
* This version of it has extra checks so that a block isn't COWed more than
* once per transaction, as long as it hasn't been written yet
*/
-noinline int btrfs_cow_block(struct btrfs_trans_handle *trans,
+int btrfs_cow_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct extent_buffer *buf,
struct extent_buffer *parent, int parent_slot,
struct extent_buffer **cow_ret,
@@ -723,7 +729,7 @@ noinline int btrfs_cow_block(struct btrfs_trans_handle *trans,
return 0;
}
- search_start = buf->start & ~((u64)SZ_1G - 1);
+ search_start = round_down(buf->start, SZ_1G);
/*
* Before CoWing this block for later modification, check if it's
@@ -732,8 +738,8 @@ noinline int btrfs_cow_block(struct btrfs_trans_handle *trans,
* Also We don't care about the error, as it's handled internally.
*/
btrfs_qgroup_trace_subtree_after_cow(trans, root, buf);
- ret = __btrfs_cow_block(trans, root, buf, parent,
- parent_slot, cow_ret, search_start, 0, nest);
+ ret = btrfs_force_cow_block(trans, root, buf, parent, parent_slot,
+ cow_ret, search_start, 0, nest);
trace_btrfs_cow_block(root, buf, *cow_ret);
@@ -742,49 +748,6 @@ noinline int btrfs_cow_block(struct btrfs_trans_handle *trans,
ALLOW_ERROR_INJECTION(btrfs_cow_block, ERRNO);
/*
- * helper function for defrag to decide if two blocks pointed to by a
- * node are actually close by
- */
-static int close_blocks(u64 blocknr, u64 other, u32 blocksize)
-{
- if (blocknr < other && other - (blocknr + blocksize) < 32768)
- return 1;
- if (blocknr > other && blocknr - (other + blocksize) < 32768)
- return 1;
- return 0;
-}
-
-#ifdef __LITTLE_ENDIAN
-
-/*
- * Compare two keys, on little-endian the disk order is same as CPU order and
- * we can avoid the conversion.
- */
-static int comp_keys(const struct btrfs_disk_key *disk_key,
- const struct btrfs_key *k2)
-{
- const struct btrfs_key *k1 = (const struct btrfs_key *)disk_key;
-
- return btrfs_comp_cpu_keys(k1, k2);
-}
-
-#else
-
-/*
- * compare two keys in a memcmp fashion
- */
-static int comp_keys(const struct btrfs_disk_key *disk,
- const struct btrfs_key *k2)
-{
- struct btrfs_key k1;
-
- btrfs_disk_key_to_cpu(&k1, disk);
-
- return btrfs_comp_cpu_keys(&k1, k2);
-}
-#endif
-
-/*
* same as comp_keys only with two btrfs_key's
*/
int __pure btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2)
@@ -805,105 +768,6 @@ int __pure btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_ke
}
/*
- * this is used by the defrag code to go through all the
- * leaves pointed to by a node and reallocate them so that
- * disk order is close to key order
- */
-int btrfs_realloc_node(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, struct extent_buffer *parent,
- int start_slot, u64 *last_ret,
- struct btrfs_key *progress)
-{
- struct btrfs_fs_info *fs_info = root->fs_info;
- struct extent_buffer *cur;
- u64 blocknr;
- u64 search_start = *last_ret;
- u64 last_block = 0;
- u64 other;
- u32 parent_nritems;
- int end_slot;
- int i;
- int err = 0;
- u32 blocksize;
- int progress_passed = 0;
- struct btrfs_disk_key disk_key;
-
- /*
- * COWing must happen through a running transaction, which always
- * matches the current fs generation (it's a transaction with a state
- * less than TRANS_STATE_UNBLOCKED). If it doesn't, then turn the fs
- * into error state to prevent the commit of any transaction.
- */
- if (unlikely(trans->transaction != fs_info->running_transaction ||
- trans->transid != fs_info->generation)) {
- btrfs_abort_transaction(trans, -EUCLEAN);
- btrfs_crit(fs_info,
-"unexpected transaction when attempting to reallocate parent %llu for root %llu, transaction %llu running transaction %llu fs generation %llu",
- parent->start, btrfs_root_id(root), trans->transid,
- fs_info->running_transaction->transid,
- fs_info->generation);
- return -EUCLEAN;
- }
-
- parent_nritems = btrfs_header_nritems(parent);
- blocksize = fs_info->nodesize;
- end_slot = parent_nritems - 1;
-
- if (parent_nritems <= 1)
- return 0;
-
- for (i = start_slot; i <= end_slot; i++) {
- int close = 1;
-
- btrfs_node_key(parent, &disk_key, i);
- if (!progress_passed && comp_keys(&disk_key, progress) < 0)
- continue;
-
- progress_passed = 1;
- blocknr = btrfs_node_blockptr(parent, i);
- if (last_block == 0)
- last_block = blocknr;
-
- if (i > 0) {
- other = btrfs_node_blockptr(parent, i - 1);
- close = close_blocks(blocknr, other, blocksize);
- }
- if (!close && i < end_slot) {
- other = btrfs_node_blockptr(parent, i + 1);
- close = close_blocks(blocknr, other, blocksize);
- }
- if (close) {
- last_block = blocknr;
- continue;
- }
-
- cur = btrfs_read_node_slot(parent, i);
- if (IS_ERR(cur))
- return PTR_ERR(cur);
- if (search_start == 0)
- search_start = last_block;
-
- btrfs_tree_lock(cur);
- err = __btrfs_cow_block(trans, root, cur, parent, i,
- &cur, search_start,
- min(16 * blocksize,
- (end_slot - i) * blocksize),
- BTRFS_NESTING_COW);
- if (err) {
- btrfs_tree_unlock(cur);
- free_extent_buffer(cur);
- break;
- }
- search_start = cur->start;
- last_block = cur->start;
- *last_ret = search_start;
- btrfs_tree_unlock(cur);
- free_extent_buffer(cur);
- }
- return err;
-}
-
-/*
* Search for a key in the given extent_buffer.
*
* The lower boundary for the search is specified by the slot number @first_slot.
@@ -969,7 +833,7 @@ int btrfs_bin_search(struct extent_buffer *eb, int first_slot,
tmp = &unaligned;
}
- ret = comp_keys(tmp, key);
+ ret = btrfs_comp_keys(tmp, key);
if (ret < 0)
low = mid + 1;
@@ -984,19 +848,19 @@ int btrfs_bin_search(struct extent_buffer *eb, int first_slot,
return 1;
}
-static void root_add_used(struct btrfs_root *root, u32 size)
+static void root_add_used_bytes(struct btrfs_root *root)
{
spin_lock(&root->accounting_lock);
btrfs_set_root_used(&root->root_item,
- btrfs_root_used(&root->root_item) + size);
+ btrfs_root_used(&root->root_item) + root->fs_info->nodesize);
spin_unlock(&root->accounting_lock);
}
-static void root_sub_used(struct btrfs_root *root, u32 size)
+static void root_sub_used_bytes(struct btrfs_root *root)
{
spin_lock(&root->accounting_lock);
btrfs_set_root_used(&root->root_item,
- btrfs_root_used(&root->root_item) - size);
+ btrfs_root_used(&root->root_item) - root->fs_info->nodesize);
spin_unlock(&root->accounting_lock);
}
@@ -1112,7 +976,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
/* once for the path */
free_extent_buffer(mid);
- root_sub_used(root, mid->len);
+ root_sub_used_bytes(root);
btrfs_free_tree_block(trans, btrfs_root_id(root), mid, 0, 1);
/* once for the root ptr */
free_extent_buffer_stale(mid);
@@ -1182,7 +1046,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
right = NULL;
goto out;
}
- root_sub_used(root, right->len);
+ root_sub_used_bytes(root);
btrfs_free_tree_block(trans, btrfs_root_id(root), right,
0, 1);
free_extent_buffer_stale(right);
@@ -1240,7 +1104,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
mid = NULL;
goto out;
}
- root_sub_used(root, mid->len);
+ root_sub_used_bytes(root);
btrfs_free_tree_block(trans, btrfs_root_id(root), mid, 0, 1);
free_extent_buffer_stale(mid);
mid = NULL;
@@ -2006,7 +1870,7 @@ static int search_leaf(struct btrfs_trans_handle *trans,
* the extent buffer's header and we have recently accessed
* the header's level field.
*/
- ret = comp_keys(&first_key, key);
+ ret = btrfs_comp_keys(&first_key, key);
if (ret < 0) {
/*
* The first key is smaller than the key we want
@@ -2091,8 +1955,8 @@ static int search_leaf(struct btrfs_trans_handle *trans,
}
/*
- * btrfs_search_slot - look for a key in a tree and perform necessary
- * modifications to preserve tree invariants.
+ * Look for a key in a tree and perform necessary modifications to preserve
+ * tree invariants.
*
* @trans: Handle of transaction, used when modifying the tree
* @p: Holds all btree nodes along the search path
@@ -2515,7 +2379,7 @@ static int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path)
*/
if (path->slots[0] < btrfs_header_nritems(path->nodes[0])) {
btrfs_item_key(path->nodes[0], &found_key, path->slots[0]);
- ret = comp_keys(&found_key, &orig_key);
+ ret = btrfs_comp_keys(&found_key, &orig_key);
if (ret == 0) {
if (path->slots[0] > 0) {
path->slots[0]--;
@@ -2530,7 +2394,7 @@ static int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path)
}
btrfs_item_key(path->nodes[0], &found_key, 0);
- ret = comp_keys(&found_key, &key);
+ ret = btrfs_comp_keys(&found_key, &key);
/*
* We might have had an item with the previous key in the tree right
* before we released our path. And after we released our path, that
@@ -2721,7 +2585,7 @@ void btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
slot = path->slots[0];
if (slot > 0) {
btrfs_item_key(eb, &disk_key, slot - 1);
- if (unlikely(comp_keys(&disk_key, new_key) >= 0)) {
+ if (unlikely(btrfs_comp_keys(&disk_key, new_key) >= 0)) {
btrfs_print_leaf(eb);
btrfs_crit(fs_info,
"slot %u key (%llu %u %llu) new key (%llu %u %llu)",
@@ -2735,7 +2599,7 @@ void btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
}
if (slot < btrfs_header_nritems(eb) - 1) {
btrfs_item_key(eb, &disk_key, slot + 1);
- if (unlikely(comp_keys(&disk_key, new_key) <= 0)) {
+ if (unlikely(btrfs_comp_keys(&disk_key, new_key) <= 0)) {
btrfs_print_leaf(eb);
btrfs_crit(fs_info,
"slot %u key (%llu %u %llu) new key (%llu %u %llu)",
@@ -2976,7 +2840,6 @@ static noinline int insert_new_root(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path, int level)
{
- struct btrfs_fs_info *fs_info = root->fs_info;
u64 lower_gen;
struct extent_buffer *lower;
struct extent_buffer *c;
@@ -2995,11 +2858,11 @@ static noinline int insert_new_root(struct btrfs_trans_handle *trans,
c = btrfs_alloc_tree_block(trans, root, 0, root->root_key.objectid,
&lower_key, level, root->node->start, 0,
- BTRFS_NESTING_NEW_ROOT);
+ 0, BTRFS_NESTING_NEW_ROOT);
if (IS_ERR(c))
return PTR_ERR(c);
- root_add_used(root, fs_info->nodesize);
+ root_add_used_bytes(root);
btrfs_set_header_nritems(c, 1);
btrfs_set_node_key(c, &lower_key, 0);
@@ -3139,11 +3002,11 @@ static noinline int split_node(struct btrfs_trans_handle *trans,
split = btrfs_alloc_tree_block(trans, root, 0, root->root_key.objectid,
&disk_key, level, c->start, 0,
- BTRFS_NESTING_SPLIT);
+ 0, BTRFS_NESTING_SPLIT);
if (IS_ERR(split))
return PTR_ERR(split);
- root_add_used(root, fs_info->nodesize);
+ root_add_used_bytes(root);
ASSERT(btrfs_header_level(c) == level);
ret = btrfs_tree_mod_log_eb_copy(split, c, 0, mid, c_nritems - mid);
@@ -3890,13 +3753,13 @@ again:
* use BTRFS_NESTING_NEW_ROOT.
*/
right = btrfs_alloc_tree_block(trans, root, 0, root->root_key.objectid,
- &disk_key, 0, l->start, 0,
+ &disk_key, 0, l->start, 0, 0,
num_doubles ? BTRFS_NESTING_NEW_ROOT :
BTRFS_NESTING_SPLIT);
if (IS_ERR(right))
return PTR_ERR(right);
- root_add_used(root, fs_info->nodesize);
+ root_add_used_bytes(root);
if (split == 0) {
if (mid <= slot) {
@@ -4576,7 +4439,7 @@ static noinline int btrfs_del_leaf(struct btrfs_trans_handle *trans,
*/
btrfs_unlock_up_safe(path, 0);
- root_sub_used(root, leaf->len);
+ root_sub_used_bytes(root);
atomic_inc(&leaf->refs);
btrfs_free_tree_block(trans, btrfs_root_id(root), leaf, 0, 1);