summaryrefslogtreecommitdiffstats
path: root/fs/btrfs/ctree.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/btrfs/ctree.c')
-rw-r--r--fs/btrfs/ctree.c775
1 files changed, 671 insertions, 104 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 8206b3900587..9d7621f271ff 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -321,7 +321,7 @@ struct tree_mod_root {
struct tree_mod_elem {
struct rb_node node;
u64 index; /* shifted logical */
- struct seq_list elem;
+ u64 seq;
enum mod_log_op op;
/* this is used for MOD_LOG_KEY_* and MOD_LOG_MOVE_KEYS operations */
@@ -341,20 +341,50 @@ struct tree_mod_elem {
struct tree_mod_root old_root;
};
-static inline void
-__get_tree_mod_seq(struct btrfs_fs_info *fs_info, struct seq_list *elem)
+static inline void tree_mod_log_read_lock(struct btrfs_fs_info *fs_info)
{
- elem->seq = atomic_inc_return(&fs_info->tree_mod_seq);
- list_add_tail(&elem->list, &fs_info->tree_mod_seq_list);
+ read_lock(&fs_info->tree_mod_log_lock);
}
-void btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
- struct seq_list *elem)
+static inline void tree_mod_log_read_unlock(struct btrfs_fs_info *fs_info)
+{
+ read_unlock(&fs_info->tree_mod_log_lock);
+}
+
+static inline void tree_mod_log_write_lock(struct btrfs_fs_info *fs_info)
+{
+ write_lock(&fs_info->tree_mod_log_lock);
+}
+
+static inline void tree_mod_log_write_unlock(struct btrfs_fs_info *fs_info)
+{
+ write_unlock(&fs_info->tree_mod_log_lock);
+}
+
+/*
+ * This adds a new blocker to the tree mod log's blocker list if the @elem
+ * passed does not already have a sequence number set. So when a caller expects
+ * to record tree modifications, it should ensure to set elem->seq to zero
+ * before calling btrfs_get_tree_mod_seq.
+ * Returns a fresh, unused tree log modification sequence number, even if no new
+ * blocker was added.
+ */
+u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
+ struct seq_list *elem)
{
- elem->flags = 1;
+ u64 seq;
+
+ tree_mod_log_write_lock(fs_info);
spin_lock(&fs_info->tree_mod_seq_lock);
- __get_tree_mod_seq(fs_info, elem);
+ if (!elem->seq) {
+ elem->seq = btrfs_inc_tree_mod_seq(fs_info);
+ list_add_tail(&elem->list, &fs_info->tree_mod_seq_list);
+ }
+ seq = btrfs_inc_tree_mod_seq(fs_info);
spin_unlock(&fs_info->tree_mod_seq_lock);
+ tree_mod_log_write_unlock(fs_info);
+
+ return seq;
}
void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
@@ -371,41 +401,46 @@ void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
if (!seq_putting)
return;
- BUG_ON(!(elem->flags & 1));
spin_lock(&fs_info->tree_mod_seq_lock);
list_del(&elem->list);
+ elem->seq = 0;
list_for_each_entry(cur_elem, &fs_info->tree_mod_seq_list, list) {
- if ((cur_elem->flags & 1) && cur_elem->seq < min_seq) {
+ if (cur_elem->seq < min_seq) {
if (seq_putting > cur_elem->seq) {
/*
* blocker with lower sequence number exists, we
* cannot remove anything from the log
*/
- goto out;
+ spin_unlock(&fs_info->tree_mod_seq_lock);
+ return;
}
min_seq = cur_elem->seq;
}
}
+ spin_unlock(&fs_info->tree_mod_seq_lock);
+
+ /*
+ * we removed the lowest blocker from the blocker list, so there may be
+ * more processible delayed refs.
+ */
+ wake_up(&fs_info->tree_mod_seq_wait);
/*
* anything that's lower than the lowest existing (read: blocked)
* sequence number can be removed from the tree.
*/
- write_lock(&fs_info->tree_mod_log_lock);
+ tree_mod_log_write_lock(fs_info);
tm_root = &fs_info->tree_mod_log;
for (node = rb_first(tm_root); node; node = next) {
next = rb_next(node);
tm = container_of(node, struct tree_mod_elem, node);
- if (tm->elem.seq > min_seq)
+ if (tm->seq > min_seq)
continue;
rb_erase(node, tm_root);
- list_del(&tm->elem.list);
kfree(tm);
}
- write_unlock(&fs_info->tree_mod_log_lock);
-out:
- spin_unlock(&fs_info->tree_mod_seq_lock);
+ tree_mod_log_write_unlock(fs_info);
}
/*
@@ -423,11 +458,9 @@ __tree_mod_log_insert(struct btrfs_fs_info *fs_info, struct tree_mod_elem *tm)
struct rb_node **new;
struct rb_node *parent = NULL;
struct tree_mod_elem *cur;
- int ret = 0;
- BUG_ON(!tm || !tm->elem.seq);
+ BUG_ON(!tm || !tm->seq);
- write_lock(&fs_info->tree_mod_log_lock);
tm_root = &fs_info->tree_mod_log;
new = &tm_root->rb_node;
while (*new) {
@@ -437,88 +470,81 @@ __tree_mod_log_insert(struct btrfs_fs_info *fs_info, struct tree_mod_elem *tm)
new = &((*new)->rb_left);
else if (cur->index > tm->index)
new = &((*new)->rb_right);
- else if (cur->elem.seq < tm->elem.seq)
+ else if (cur->seq < tm->seq)
new = &((*new)->rb_left);
- else if (cur->elem.seq > tm->elem.seq)
+ else if (cur->seq > tm->seq)
new = &((*new)->rb_right);
else {
kfree(tm);
- ret = -EEXIST;
- goto unlock;
+ return -EEXIST;
}
}
rb_link_node(&tm->node, parent, new);
rb_insert_color(&tm->node, tm_root);
-unlock:
- write_unlock(&fs_info->tree_mod_log_lock);
- return ret;
+ return 0;
}
+/*
+ * Determines if logging can be omitted. Returns 1 if it can. Otherwise, it
+ * returns zero with the tree_mod_log_lock acquired. The caller must hold
+ * this until all tree mod log insertions are recorded in the rb tree and then
+ * call tree_mod_log_write_unlock() to release.
+ */
static inline int tree_mod_dont_log(struct btrfs_fs_info *fs_info,
struct extent_buffer *eb) {
smp_mb();
if (list_empty(&(fs_info)->tree_mod_seq_list))
return 1;
- if (!eb)
- return 0;
- if (btrfs_header_level(eb) == 0)
+ if (eb && btrfs_header_level(eb) == 0)
+ return 1;
+
+ tree_mod_log_write_lock(fs_info);
+ if (list_empty(&fs_info->tree_mod_seq_list)) {
+ /*
+ * someone emptied the list while we were waiting for the lock.
+ * we must not add to the list when no blocker exists.
+ */
+ tree_mod_log_write_unlock(fs_info);
return 1;
+ }
+
return 0;
}
/*
- * This allocates memory and gets a tree modification sequence number when
- * needed.
+ * This allocates memory and gets a tree modification sequence number.
*
- * Returns 0 when no sequence number is needed, < 0 on error.
- * Returns 1 when a sequence number was added. In this case,
- * fs_info->tree_mod_seq_lock was acquired and must be released by the caller
- * after inserting into the rb tree.
+ * Returns <0 on error.
+ * Returns >0 (the added sequence number) on success.
*/
static inline int tree_mod_alloc(struct btrfs_fs_info *fs_info, gfp_t flags,
struct tree_mod_elem **tm_ret)
{
struct tree_mod_elem *tm;
- int seq;
- if (tree_mod_dont_log(fs_info, NULL))
- return 0;
-
- tm = *tm_ret = kzalloc(sizeof(*tm), flags);
+ /*
+ * once we switch from spin locks to something different, we should
+ * honor the flags parameter here.
+ */
+ tm = *tm_ret = kzalloc(sizeof(*tm), GFP_ATOMIC);
if (!tm)
return -ENOMEM;
- tm->elem.flags = 0;
- spin_lock(&fs_info->tree_mod_seq_lock);
- if (list_empty(&fs_info->tree_mod_seq_list)) {
- /*
- * someone emptied the list while we were waiting for the lock.
- * we must not add to the list, because no blocker exists. items
- * are removed from the list only when the existing blocker is
- * removed from the list.
- */
- kfree(tm);
- seq = 0;
- spin_unlock(&fs_info->tree_mod_seq_lock);
- } else {
- __get_tree_mod_seq(fs_info, &tm->elem);
- seq = tm->elem.seq;
- }
-
- return seq;
+ tm->seq = btrfs_inc_tree_mod_seq(fs_info);
+ return tm->seq;
}
-static noinline int
-tree_mod_log_insert_key_mask(struct btrfs_fs_info *fs_info,
- struct extent_buffer *eb, int slot,
- enum mod_log_op op, gfp_t flags)
+static inline int
+__tree_mod_log_insert_key(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *eb, int slot,
+ enum mod_log_op op, gfp_t flags)
{
- struct tree_mod_elem *tm;
int ret;
+ struct tree_mod_elem *tm;
ret = tree_mod_alloc(fs_info, flags, &tm);
- if (ret <= 0)
+ if (ret < 0)
return ret;
tm->index = eb->start >> PAGE_CACHE_SHIFT;
@@ -530,8 +556,22 @@ tree_mod_log_insert_key_mask(struct btrfs_fs_info *fs_info,
tm->slot = slot;
tm->generation = btrfs_node_ptr_generation(eb, slot);
- ret = __tree_mod_log_insert(fs_info, tm);
- spin_unlock(&fs_info->tree_mod_seq_lock);
+ return __tree_mod_log_insert(fs_info, tm);
+}
+
+static noinline int
+tree_mod_log_insert_key_mask(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *eb, int slot,
+ enum mod_log_op op, gfp_t flags)
+{
+ int ret;
+
+ if (tree_mod_dont_log(fs_info, eb))
+ return 0;
+
+ ret = __tree_mod_log_insert_key(fs_info, eb, slot, op, flags);
+
+ tree_mod_log_write_unlock(fs_info);
return ret;
}
@@ -543,6 +583,14 @@ tree_mod_log_insert_key(struct btrfs_fs_info *fs_info, struct extent_buffer *eb,
}
static noinline int
+tree_mod_log_insert_key_locked(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *eb, int slot,
+ enum mod_log_op op)
+{
+ return __tree_mod_log_insert_key(fs_info, eb, slot, op, GFP_NOFS);
+}
+
+static noinline int
tree_mod_log_insert_move(struct btrfs_fs_info *fs_info,
struct extent_buffer *eb, int dst_slot, int src_slot,
int nr_items, gfp_t flags)
@@ -555,14 +603,14 @@ tree_mod_log_insert_move(struct btrfs_fs_info *fs_info,
return 0;
for (i = 0; i + dst_slot < src_slot && i < nr_items; i++) {
- ret = tree_mod_log_insert_key(fs_info, eb, i + dst_slot,
+ ret = tree_mod_log_insert_key_locked(fs_info, eb, i + dst_slot,
MOD_LOG_KEY_REMOVE_WHILE_MOVING);
BUG_ON(ret < 0);
}
ret = tree_mod_alloc(fs_info, flags, &tm);
- if (ret <= 0)
- return ret;
+ if (ret < 0)
+ goto out;
tm->index = eb->start >> PAGE_CACHE_SHIFT;
tm->slot = src_slot;
@@ -571,10 +619,26 @@ tree_mod_log_insert_move(struct btrfs_fs_info *fs_info,
tm->op = MOD_LOG_MOVE_KEYS;
ret = __tree_mod_log_insert(fs_info, tm);
- spin_unlock(&fs_info->tree_mod_seq_lock);
+out:
+ tree_mod_log_write_unlock(fs_info);
return ret;
}
+static inline void
+__tree_mod_log_free_eb(struct btrfs_fs_info *fs_info, struct extent_buffer *eb)
+{
+ int i;
+ u32 nritems;
+ int ret;
+
+ nritems = btrfs_header_nritems(eb);
+ for (i = nritems - 1; i >= 0; i--) {
+ ret = tree_mod_log_insert_key_locked(fs_info, eb, i,
+ MOD_LOG_KEY_REMOVE_WHILE_FREEING);
+ BUG_ON(ret < 0);
+ }
+}
+
static noinline int
tree_mod_log_insert_root(struct btrfs_fs_info *fs_info,
struct extent_buffer *old_root,
@@ -583,9 +647,14 @@ tree_mod_log_insert_root(struct btrfs_fs_info *fs_info,
struct tree_mod_elem *tm;
int ret;
+ if (tree_mod_dont_log(fs_info, NULL))
+ return 0;
+
+ __tree_mod_log_free_eb(fs_info, old_root);
+
ret = tree_mod_alloc(fs_info, flags, &tm);
- if (ret <= 0)
- return ret;
+ if (ret < 0)
+ goto out;
tm->index = new_root->start >> PAGE_CACHE_SHIFT;
tm->old_root.logical = old_root->start;
@@ -594,7 +663,8 @@ tree_mod_log_insert_root(struct btrfs_fs_info *fs_info,
tm->op = MOD_LOG_ROOT_REPLACE;
ret = __tree_mod_log_insert(fs_info, tm);
- spin_unlock(&fs_info->tree_mod_seq_lock);
+out:
+ tree_mod_log_write_unlock(fs_info);
return ret;
}
@@ -608,7 +678,7 @@ __tree_mod_log_search(struct btrfs_fs_info *fs_info, u64 start, u64 min_seq,
struct tree_mod_elem *found = NULL;
u64 index = start >> PAGE_CACHE_SHIFT;
- read_lock(&fs_info->tree_mod_log_lock);
+ tree_mod_log_read_lock(fs_info);
tm_root = &fs_info->tree_mod_log;
node = tm_root->rb_node;
while (node) {
@@ -617,18 +687,18 @@ __tree_mod_log_search(struct btrfs_fs_info *fs_info, u64 start, u64 min_seq,
node = node->rb_left;
} else if (cur->index > index) {
node = node->rb_right;
- } else if (cur->elem.seq < min_seq) {
+ } else if (cur->seq < min_seq) {
node = node->rb_left;
} else if (!smallest) {
/* we want the node with the highest seq */
if (found)
- BUG_ON(found->elem.seq > cur->elem.seq);
+ BUG_ON(found->seq > cur->seq);
found = cur;
node = node->rb_left;
- } else if (cur->elem.seq > min_seq) {
+ } else if (cur->seq > min_seq) {
/* we want the node with the smallest seq */
if (found)
- BUG_ON(found->elem.seq < cur->elem.seq);
+ BUG_ON(found->seq < cur->seq);
found = cur;
node = node->rb_right;
} else {
@@ -636,7 +706,7 @@ __tree_mod_log_search(struct btrfs_fs_info *fs_info, u64 start, u64 min_seq,
break;
}
}
- read_unlock(&fs_info->tree_mod_log_lock);
+ tree_mod_log_read_unlock(fs_info);
return found;
}
@@ -664,7 +734,7 @@ tree_mod_log_search(struct btrfs_fs_info *fs_info, u64 start, u64 min_seq)
return __tree_mod_log_search(fs_info, start, min_seq, 0);
}
-static inline void
+static noinline void
tree_mod_log_eb_copy(struct btrfs_fs_info *fs_info, struct extent_buffer *dst,
struct extent_buffer *src, unsigned long dst_offset,
unsigned long src_offset, int nr_items)
@@ -675,18 +745,23 @@ tree_mod_log_eb_copy(struct btrfs_fs_info *fs_info, struct extent_buffer *dst,
if (tree_mod_dont_log(fs_info, NULL))
return;
- if (btrfs_header_level(dst) == 0 && btrfs_header_level(src) == 0)
+ if (btrfs_header_level(dst) == 0 && btrfs_header_level(src) == 0) {
+ tree_mod_log_write_unlock(fs_info);
return;
+ }
- /* speed this up by single seq for all operations? */
for (i = 0; i < nr_items; i++) {
- ret = tree_mod_log_insert_key(fs_info, src, i + src_offset,
- MOD_LOG_KEY_REMOVE);
+ ret = tree_mod_log_insert_key_locked(fs_info, src,
+ i + src_offset,
+ MOD_LOG_KEY_REMOVE);
BUG_ON(ret < 0);
- ret = tree_mod_log_insert_key(fs_info, dst, i + dst_offset,
- MOD_LOG_KEY_ADD);
+ ret = tree_mod_log_insert_key_locked(fs_info, dst,
+ i + dst_offset,
+ MOD_LOG_KEY_ADD);
BUG_ON(ret < 0);
}
+
+ tree_mod_log_write_unlock(fs_info);
}
static inline void
@@ -699,7 +774,7 @@ tree_mod_log_eb_move(struct btrfs_fs_info *fs_info, struct extent_buffer *dst,
BUG_ON(ret < 0);
}
-static inline void
+static noinline void
tree_mod_log_set_node_key(struct btrfs_fs_info *fs_info,
struct extent_buffer *eb,
struct btrfs_disk_key *disk_key, int slot, int atomic)
@@ -712,30 +787,22 @@ tree_mod_log_set_node_key(struct btrfs_fs_info *fs_info,
BUG_ON(ret < 0);
}
-static void tree_mod_log_free_eb(struct btrfs_fs_info *fs_info,
- struct extent_buffer *eb)
+static noinline void
+tree_mod_log_free_eb(struct btrfs_fs_info *fs_info, struct extent_buffer *eb)
{
- int i;
- int ret;
- u32 nritems;
-
if (tree_mod_dont_log(fs_info, eb))
return;
- nritems = btrfs_header_nritems(eb);
- for (i = nritems - 1; i >= 0; i--) {
- ret = tree_mod_log_insert_key(fs_info, eb, i,
- MOD_LOG_KEY_REMOVE_WHILE_FREEING);
- BUG_ON(ret < 0);
- }
+ __tree_mod_log_free_eb(fs_info, eb);
+
+ tree_mod_log_write_unlock(fs_info);
}
-static inline void
+static noinline void
tree_mod_log_set_root_pointer(struct btrfs_root *root,
struct extent_buffer *new_root_node)
{
int ret;
- tree_mod_log_free_eb(root->fs_info, root->node);
ret = tree_mod_log_insert_root(root->fs_info, root->node,
new_root_node, GFP_NOFS);
BUG_ON(ret < 0);
@@ -1069,7 +1136,7 @@ __tree_mod_log_rewind(struct extent_buffer *eb, u64 time_seq,
unsigned long p_size = sizeof(struct btrfs_key_ptr);
n = btrfs_header_nritems(eb);
- while (tm && tm->elem.seq >= time_seq) {
+ while (tm && tm->seq >= time_seq) {
/*
* all the operations are recorded with the operator used for
* the modification. as we're going backwards, we do the
@@ -2722,6 +2789,80 @@ done:
}
/*
+ * helper to use instead of search slot if no exact match is needed but
+ * instead the next or previous item should be returned.
+ * When find_higher is true, the next higher item is returned, the next lower
+ * otherwise.
+ * When return_any and find_higher are both true, and no higher item is found,
+ * return the next lower instead.
+ * When return_any is true and find_higher is false, and no lower item is found,
+ * return the next higher instead.
+ * It returns 0 if any item is found, 1 if none is found (tree empty), and
+ * < 0 on error
+ */
+int btrfs_search_slot_for_read(struct btrfs_root *root,
+ struct btrfs_key *key, struct btrfs_path *p,
+ int find_higher, int return_any)
+{
+ int ret;
+ struct extent_buffer *leaf;
+
+again:
+ ret = btrfs_search_slot(NULL, root, key, p, 0, 0);
+ if (ret <= 0)
+ return ret;
+ /*
+ * a return value of 1 means the path is at the position where the
+ * item should be inserted. Normally this is the next bigger item,
+ * but in case the previous item is the last in a leaf, path points
+ * to the first free slot in the previous leaf, i.e. at an invalid
+ * item.
+ */
+ leaf = p->nodes[0];
+
+ if (find_higher) {
+ if (p->slots[0] >= btrfs_header_nritems(leaf)) {
+ ret = btrfs_next_leaf(root, p);
+ if (ret <= 0)
+ return ret;
+ if (!return_any)
+ return 1;
+ /*
+ * no higher item found, return the next
+ * lower instead
+ */
+ return_any = 0;
+ find_higher = 0;
+ btrfs_release_path(p);
+ goto again;
+ }
+ } else {
+ if (p->slots[0] == 0) {
+ ret = btrfs_prev_leaf(root, p);
+ if (ret < 0)
+ return ret;
+ if (!ret) {
+ p->slots[0] = btrfs_header_nritems(leaf) - 1;
+ return 0;
+ }
+ if (!return_any)
+ return 1;
+ /*
+ * no lower item found, return the next
+ * higher instead
+ */
+ return_any = 0;
+ find_higher = 1;
+ btrfs_release_path(p);
+ goto again;
+ } else {
+ --p->slots[0];
+ }
+ }
+ return 0;
+}
+
+/*
* adjust the pointers going up the tree, starting at level
* making sure the right key of each node is points to 'key'.
* This is used after shifting pointers to the left, so it stops
@@ -4931,6 +5072,431 @@ out:
return ret;
}
+static void tree_move_down(struct btrfs_root *root,
+ struct btrfs_path *path,
+ int *level, int root_level)
+{
+ path->nodes[*level - 1] = read_node_slot(root, path->nodes[*level],
+ path->slots[*level]);
+ path->slots[*level - 1] = 0;
+ (*level)--;
+}
+
+static int tree_move_next_or_upnext(struct btrfs_root *root,
+ struct btrfs_path *path,
+ int *level, int root_level)
+{
+ int ret = 0;
+ int nritems;
+ nritems = btrfs_header_nritems(path->nodes[*level]);
+
+ path->slots[*level]++;
+
+ while (path->slots[*level] == nritems) {
+ if (*level == root_level)
+ return -1;
+
+ /* move upnext */
+ path->slots[*level] = 0;
+ free_extent_buffer(path->nodes[*level]);
+ path->nodes[*level] = NULL;
+ (*level)++;
+ path->slots[*level]++;
+
+ nritems = btrfs_header_nritems(path->nodes[*level]);
+ ret = 1;
+ }
+ return ret;
+}
+
+/*
+ * Returns 1 if it had to move up and next. 0 is returned if it moved only next
+ * or down.
+ */
+static int tree_advance(struct btrfs_root *root,
+ struct btrfs_path *path,
+ int *level, int root_level,
+ int allow_down,
+ struct btrfs_key *key)
+{
+ int ret;
+
+ if (*level == 0 || !allow_down) {
+ ret = tree_move_next_or_upnext(root, path, level, root_level);
+ } else {
+ tree_move_down(root, path, level, root_level);
+ ret = 0;
+ }
+ if (ret >= 0) {
+ if (*level == 0)
+ btrfs_item_key_to_cpu(path->nodes[*level], key,
+ path->slots[*level]);
+ else
+ btrfs_node_key_to_cpu(path->nodes[*level], key,
+ path->slots[*level]);
+ }
+ return ret;
+}
+
+static int tree_compare_item(struct btrfs_root *left_root,
+ struct btrfs_path *left_path,
+ struct btrfs_path *right_path,
+ char *tmp_buf)
+{
+ int cmp;
+ int len1, len2;
+ unsigned long off1, off2;
+
+ len1 = btrfs_item_size_nr(left_path->nodes[0], left_path->slots[0]);
+ len2 = btrfs_item_size_nr(right_path->nodes[0], right_path->slots[0]);
+ if (len1 != len2)
+ return 1;
+
+ off1 = btrfs_item_ptr_offset(left_path->nodes[0], left_path->slots[0]);
+ off2 = btrfs_item_ptr_offset(right_path->nodes[0],
+ right_path->slots[0]);
+
+ read_extent_buffer(left_path->nodes[0], tmp_buf, off1, len1);
+
+ cmp = memcmp_extent_buffer(right_path->nodes[0], tmp_buf, off2, len1);
+ if (cmp)
+ return 1;
+ return 0;
+}
+
+#define ADVANCE 1
+#define ADVANCE_ONLY_NEXT -1
+
+/*
+ * This function compares two trees and calls the provided callback for
+ * every changed/new/deleted item it finds.
+ * If shared tree blocks are encountered, whole subtrees are skipped, making
+ * the compare pretty fast on snapshotted subvolumes.
+ *
+ * This currently works on commit roots only. As commit roots are read only,
+ * we don't do any locking. The commit roots are protected with transactions.
+ * Transactions are ended and rejoined when a commit is tried in between.
+ *
+ * This function checks for modifications done to the trees while comparing.
+ * If it detects a change, it aborts immediately.
+ */
+int btrfs_compare_trees(struct btrfs_root *left_root,
+ struct btrfs_root *right_root,
+ btrfs_changed_cb_t changed_cb, void *ctx)
+{
+ int ret;
+ int cmp;
+ struct btrfs_trans_handle *trans = NULL;
+ struct btrfs_path *left_path = NULL;
+ struct btrfs_path *right_path = NULL;
+ struct btrfs_key left_key;
+ struct btrfs_key right_key;
+ char *tmp_buf = NULL;
+ int left_root_level;
+ int right_root_level;
+ int left_level;
+ int right_level;
+ int left_end_reached;
+ int right_end_reached;
+ int advance_left;
+ int advance_right;
+ u64 left_blockptr;
+ u64 right_blockptr;
+ u64 left_start_ctransid;
+ u64 right_start_ctransid;
+ u64 ctransid;
+
+ left_path = btrfs_alloc_path();
+ if (!left_path) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ right_path = btrfs_alloc_path();
+ if (!right_path) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ tmp_buf = kmalloc(left_root->leafsize, GFP_NOFS);
+ if (!tmp_buf) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ left_path->search_commit_root = 1;
+ left_path->skip_locking = 1;
+ right_path->search_commit_root = 1;
+ right_path->skip_locking = 1;
+
+ spin_lock(&left_root->root_times_lock);
+ left_start_ctransid = btrfs_root_ctransid(&left_root->root_item);
+ spin_unlock(&left_root->root_times_lock);
+
+ spin_lock(&right_root->root_times_lock);
+ right_start_ctransid = btrfs_root_ctransid(&right_root->root_item);
+ spin_unlock(&right_root->root_times_lock);
+
+ trans = btrfs_join_transaction(left_root);
+ if (IS_ERR(trans)) {
+ ret = PTR_ERR(trans);
+ trans = NULL;
+ goto out;
+ }
+
+ /*
+ * Strategy: Go to the first items of both trees. Then do
+ *
+ * If both trees are at level 0
+ * Compare keys of current items
+ * If left < right treat left item as new, advance left tree
+ * and repeat
+ * If left > right treat right item as deleted, advance right tree
+ * and repeat
+ * If left == right do deep compare of items, treat as changed if
+ * needed, advance both trees and repeat
+ * If both trees are at the same level but not at level 0
+ * Compare keys of current nodes/leafs
+ * If left < right advance left tree and repeat
+ * If left > right advance right tree and repeat
+ * If left == right compare blockptrs of the next nodes/leafs
+ * If they match advance both trees but stay at the same level
+ * and repeat
+ * If they don't match advance both trees while allowing to go
+ * deeper and repeat
+ * If tree levels are different
+ * Advance the tree that needs it and repeat
+ *
+ * Advancing a tree means:
+ * If we are at level 0, try to go to the next slot. If that's not
+ * possible, go one level up and repeat. Stop when we found a level
+ * where we could go to the next slot. We may at this point be on a
+ * node or a leaf.
+ *
+ * If we are not at level 0 and not on shared tree blocks, go one
+ * level deeper.
+ *
+ * If we are not at level 0 and on shared tree blocks, go one slot to
+ * the right if possible or go up and right.
+ */
+
+ left_level = btrfs_header_level(left_root->commit_root);
+ left_root_level = left_level;
+ left_path->nodes[left_level] = left_root->commit_root;
+ extent_buffer_get(left_path->nodes[left_level]);
+
+ right_level = btrfs_header_level(right_root->commit_root);
+ right_root_level = right_level;
+ right_path->nodes[right_level] = right_root->commit_root;
+ extent_buffer_get(right_path->nodes[right_level]);
+
+ if (left_level == 0)
+ btrfs_item_key_to_cpu(left_path->nodes[left_level],
+ &left_key, left_path->slots[left_level]);
+ else
+ btrfs_node_key_to_cpu(left_path->nodes[left_level],
+ &left_key, left_path->slots[left_level]);
+ if (right_level == 0)
+ btrfs_item_key_to_cpu(right_path->nodes[right_level],
+ &right_key, right_path->slots[right_level]);
+ else
+ btrfs_node_key_to_cpu(right_path->nodes[right_level],
+ &right_key, right_path->slots[right_level]);
+
+ left_end_reached = right_end_reached = 0;
+ advance_left = advance_right = 0;
+
+ while (1) {
+ /*
+ * We need to make sure the transaction does not get committed
+ * while we do anything on commit roots. This means, we need to
+ * join and leave transactions for every item that we process.
+ */
+ if (trans && btrfs_should_end_transaction(trans, left_root)) {
+ btrfs_release_path(left_path);
+ btrfs_release_path(right_path);
+
+ ret = btrfs_end_transaction(trans, left_root);
+ trans = NULL;
+ if (ret < 0)
+ goto out;
+ }
+ /* now rejoin the transaction */
+ if (!trans) {
+ trans = btrfs_join_transaction(left_root);
+ if (IS_ERR(trans)) {
+ ret = PTR_ERR(trans);
+ trans = NULL;
+ goto out;
+ }
+
+ spin_lock(&left_root->root_times_lock);
+ ctransid = btrfs_root_ctransid(&left_root->root_item);
+ spin_unlock(&left_root->root_times_lock);
+ if (ctransid != left_start_ctransid)
+ left_start_ctransid = 0;
+
+ spin_lock(&right_root->root_times_lock);
+ ctransid = btrfs_root_ctransid(&right_root->root_item);
+ spin_unlock(&right_root->root_times_lock);
+ if (ctransid != right_start_ctransid)
+ right_start_ctransid = 0;
+
+ if (!left_start_ctransid || !right_start_ctransid) {
+ WARN(1, KERN_WARNING
+ "btrfs: btrfs_compare_tree detected "
+ "a change in one of the trees while "
+ "iterating. This is probably a "
+ "bug.\n");
+ ret = -EIO;
+ goto out;
+ }
+
+ /*
+ * the commit root may have changed, so start again
+ * where we stopped
+ */
+ left_path->lowest_level = left_level;
+ right_path->lowest_level = right_level;
+ ret = btrfs_search_slot(NULL, left_root,
+ &left_key, left_path, 0, 0);
+ if (ret < 0)
+ goto out;
+ ret = btrfs_search_slot(NULL, right_root,
+ &right_key, right_path, 0, 0);
+ if (ret < 0)
+ goto out;
+ }
+
+ if (advance_left && !left_end_reached) {
+ ret = tree_advance(left_root, left_path, &left_level,
+ left_root_level,
+ advance_left != ADVANCE_ONLY_NEXT,
+ &left_key);
+ if (ret < 0)
+ left_end_reached = ADVANCE;
+ advance_left = 0;
+ }
+ if (advance_right && !right_end_reached) {
+ ret = tree_advance(right_root, right_path, &right_level,
+ right_root_level,
+ advance_right != ADVANCE_ONLY_NEXT,
+ &right_key);
+ if (ret < 0)
+ right_end_reached = ADVANCE;
+ advance_right = 0;
+ }
+
+ if (left_end_reached && right_end_reached) {
+ ret = 0;
+ goto out;
+ } else if (left_end_reached) {
+ if (right_level == 0) {
+ ret = changed_cb(left_root, right_root,
+ left_path, right_path,
+ &right_key,
+ BTRFS_COMPARE_TREE_DELETED,
+ ctx);
+ if (ret < 0)
+ goto out;
+ }
+ advance_right = ADVANCE;
+ continue;
+ } else if (right_end_reached) {
+ if (left_level == 0) {
+ ret = changed_cb(left_root, right_root,
+ left_path, right_path,
+ &left_key,
+ BTRFS_COMPARE_TREE_NEW,
+ ctx);
+ if (ret < 0)
+ goto out;
+ }
+ advance_left = ADVANCE;
+ continue;
+ }
+
+ if (left_level == 0 && right_level == 0) {
+ cmp = btrfs_comp_cpu_keys(&left_key, &right_key);
+ if (cmp < 0) {
+ ret = changed_cb(left_root, right_root,
+ left_path, right_path,
+ &left_key,
+ BTRFS_COMPARE_TREE_NEW,
+ ctx);
+ if (ret < 0)
+ goto out;
+ advance_left = ADVANCE;
+ } else if (cmp > 0) {
+ ret = changed_cb(left_root, right_root,
+ left_path, right_path,
+ &right_key,
+ BTRFS_COMPARE_TREE_DELETED,
+ ctx);
+ if (ret < 0)
+ goto out;
+ advance_right = ADVANCE;
+ } else {
+ ret = tree_compare_item(left_root, left_path,
+ right_path, tmp_buf);
+ if (ret) {
+ ret = changed_cb(left_root, right_root,
+ left_path, right_path,
+ &left_key,
+ BTRFS_COMPARE_TREE_CHANGED,
+ ctx);
+ if (ret < 0)
+ goto out;
+ }
+ advance_left = ADVANCE;
+ advance_right = ADVANCE;
+ }
+ } else if (left_level == right_level) {
+ cmp = btrfs_comp_cpu_keys(&left_key, &right_key);
+ if (cmp < 0) {
+ advance_left = ADVANCE;
+ } else if (cmp > 0) {
+ advance_right = ADVANCE;
+ } else {
+ left_blockptr = btrfs_node_blockptr(
+ left_path->nodes[left_level],
+ left_path->slots[left_level]);
+ right_blockptr = btrfs_node_blockptr(
+ right_path->nodes[right_level],
+ right_path->slots[right_level]);
+ if (left_blockptr == right_blockptr) {
+ /*
+ * As we're on a shared block, don't
+ * allow to go deeper.
+ */
+ advance_left = ADVANCE_ONLY_NEXT;
+ advance_right = ADVANCE_ONLY_NEXT;
+ } else {
+ advance_left = ADVANCE;
+ advance_right = ADVANCE;
+ }
+ }
+ } else if (left_level < right_level) {
+ advance_right = ADVANCE;
+ } else {
+ advance_left = ADVANCE;
+ }
+ }
+
+out:
+ btrfs_free_path(left_path);
+ btrfs_free_path(right_path);
+ kfree(tmp_buf);
+
+ if (trans) {
+ if (!ret)
+ ret = btrfs_end_transaction(trans, left_root);
+ else
+ btrfs_end_transaction(trans, left_root);
+ }
+
+ return ret;
+}
+
/*
* this is similar to btrfs_next_leaf, but does not try to preserve
* and fixup the path. It looks for and returns the next key in the
@@ -5127,6 +5693,7 @@ again:
* locked. To solve this situation, we give up
* on our lock and cycle.
*/
+ free_extent_buffer(next);
btrfs_release_path(path);
cond_resched();
goto again;