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-rw-r--r--fs/btrfs/ctree.c155
-rw-r--r--fs/btrfs/ctree.h26
-rw-r--r--fs/btrfs/disk-io.c9
-rw-r--r--fs/btrfs/extent-tree.c2034
-rw-r--r--fs/btrfs/root-tree.c5
-rw-r--r--fs/btrfs/transaction.c15
-rw-r--r--fs/btrfs/volumes.c9
7 files changed, 1828 insertions, 425 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index f9cd40967d0..50e81f43e6d 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -179,7 +179,6 @@ int noinline __btrfs_cow_block(struct btrfs_trans_handle *trans,
struct extent_buffer *cow;
u32 nritems;
int ret = 0;
- int different_trans = 0;
int level;
int unlock_orig = 0;
@@ -233,13 +232,33 @@ int noinline __btrfs_cow_block(struct btrfs_trans_handle *trans,
WARN_ON(btrfs_header_generation(buf) > trans->transid);
if (btrfs_header_generation(buf) != trans->transid) {
u32 nr_extents;
- different_trans = 1;
ret = btrfs_inc_ref(trans, root, buf, cow, &nr_extents);
if (ret)
return ret;
ret = btrfs_cache_ref(trans, root, buf, nr_extents);
WARN_ON(ret);
+ } else if (btrfs_header_owner(buf) == BTRFS_TREE_RELOC_OBJECTID) {
+ /*
+ * There are only two places that can drop reference to
+ * tree blocks owned by living reloc trees, one is here,
+ * the other place is btrfs_merge_path. In both places,
+ * we check reference count while tree block is locked.
+ * Furthermore, if reference count is one, it won't get
+ * increased by someone else.
+ */
+ u32 refs;
+ ret = btrfs_lookup_extent_ref(trans, root, buf->start,
+ buf->len, &refs);
+ BUG_ON(ret);
+ if (refs == 1) {
+ ret = btrfs_update_ref(trans, root, buf, cow,
+ 0, nritems);
+ clean_tree_block(trans, root, buf);
+ } else {
+ ret = btrfs_inc_ref(trans, root, buf, cow, NULL);
+ }
+ BUG_ON(ret);
} else {
ret = btrfs_update_ref(trans, root, buf, cow, 0, nritems);
if (ret)
@@ -247,6 +266,14 @@ int noinline __btrfs_cow_block(struct btrfs_trans_handle *trans,
clean_tree_block(trans, root, buf);
}
+ if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) {
+ ret = btrfs_add_reloc_mapping(root, buf->start,
+ buf->len, cow->start);
+ BUG_ON(ret);
+ ret = btrfs_reloc_tree_cache_ref(trans, root, cow, buf->start);
+ WARN_ON(ret);
+ }
+
if (buf == root->node) {
WARN_ON(parent && parent != buf);
@@ -1466,6 +1493,130 @@ done:
return ret;
}
+int btrfs_merge_path(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_key *node_keys,
+ u64 *nodes, int lowest_level)
+{
+ struct extent_buffer *eb;
+ struct extent_buffer *parent;
+ struct btrfs_key key;
+ u64 bytenr;
+ u64 generation;
+ u32 blocksize;
+ int level;
+ int slot;
+ int key_match;
+ int ret;
+
+ eb = btrfs_lock_root_node(root);
+ ret = btrfs_cow_block(trans, root, eb, NULL, 0, &eb, 0);
+ BUG_ON(ret);
+
+ parent = eb;
+ while (1) {
+ level = btrfs_header_level(parent);
+ if (level == 0 || level <= lowest_level)
+ break;
+
+ ret = bin_search(parent, &node_keys[lowest_level], level,
+ &slot);
+ if (ret && slot > 0)
+ slot--;
+
+ bytenr = btrfs_node_blockptr(parent, slot);
+ if (nodes[level - 1] == bytenr)
+ break;
+
+ blocksize = btrfs_level_size(root, level - 1);
+ generation = btrfs_node_ptr_generation(parent, slot);
+ btrfs_node_key_to_cpu(eb, &key, slot);
+ key_match = !memcmp(&key, &node_keys[level - 1], sizeof(key));
+
+ /*
+ * if node keys match and node pointer hasn't been modified
+ * in the running transaction, we can merge the path. for
+ * reloc trees, the node pointer check is skipped, this is
+ * because the reloc trees are fully controlled by the space
+ * balance code, no one else can modify them.
+ */
+ if (!nodes[level - 1] || !key_match ||
+ (generation == trans->transid &&
+ root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID)) {
+next_level:
+ if (level == 1 || level == lowest_level + 1)
+ break;
+
+ eb = read_tree_block(root, bytenr, blocksize,
+ generation);
+ btrfs_tree_lock(eb);
+
+ ret = btrfs_cow_block(trans, root, eb, parent, slot,
+ &eb, 0);
+ BUG_ON(ret);
+
+ btrfs_tree_unlock(parent);
+ free_extent_buffer(parent);
+ parent = eb;
+ continue;
+ }
+
+ if (generation == trans->transid) {
+ u32 refs;
+ BUG_ON(btrfs_header_owner(eb) !=
+ BTRFS_TREE_RELOC_OBJECTID);
+ /*
+ * lock the block to keep __btrfs_cow_block from
+ * changing the reference count.
+ */
+ eb = read_tree_block(root, bytenr, blocksize,
+ generation);
+ btrfs_tree_lock(eb);
+
+ ret = btrfs_lookup_extent_ref(trans, root, bytenr,
+ blocksize, &refs);
+ BUG_ON(ret);
+ /*
+ * if replace block whose reference count is one,
+ * we have to "drop the subtree". so skip it for
+ * simplicity
+ */
+ if (refs == 1) {
+ btrfs_tree_unlock(eb);
+ free_extent_buffer(eb);
+ goto next_level;
+ }
+ }
+
+ btrfs_set_node_blockptr(parent, slot, nodes[level - 1]);
+ btrfs_set_node_ptr_generation(parent, slot, trans->transid);
+ btrfs_mark_buffer_dirty(parent);
+
+ ret = btrfs_inc_extent_ref(trans, root,
+ nodes[level - 1],
+ blocksize, parent->start,
+ btrfs_header_owner(parent),
+ btrfs_header_generation(parent),
+ level - 1, 0);
+ BUG_ON(ret);
+ ret = btrfs_free_extent(trans, root, bytenr,
+ blocksize, parent->start,
+ btrfs_header_owner(parent),
+ btrfs_header_generation(parent),
+ level - 1, 0, 1);
+ BUG_ON(ret);
+
+ if (generation == trans->transid) {
+ btrfs_tree_unlock(eb);
+ free_extent_buffer(eb);
+ }
+ break;
+ }
+ btrfs_tree_unlock(parent);
+ free_extent_buffer(parent);
+ return 0;
+}
+
/*
* adjust the pointers going up the tree, starting at level
* making sure the right key of each node is points to 'key'.
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 3e62a1b0a1f..2775e270881 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -604,6 +604,7 @@ struct btrfs_fs_info {
struct mutex chunk_mutex;
struct mutex drop_mutex;
struct mutex volume_mutex;
+ struct mutex tree_reloc_mutex;
struct list_head trans_list;
struct list_head hashers;
struct list_head dead_roots;
@@ -647,6 +648,10 @@ struct btrfs_fs_info {
struct task_struct *cleaner_kthread;
int thread_pool_size;
+ /* tree relocation relocated fields */
+ struct extent_io_tree reloc_mapping_tree;
+ struct list_head dead_reloc_roots;
+ struct btrfs_leaf_ref_tree reloc_ref_tree;
struct btrfs_leaf_ref_tree shared_ref_tree;
struct kobject super_kobj;
@@ -698,6 +703,7 @@ struct btrfs_root {
struct btrfs_leaf_ref_tree ref_tree_struct;
struct btrfs_dirty_root *dirty_root;
struct btrfs_root *log_root;
+ struct btrfs_root *reloc_root;
struct btrfs_root_item root_item;
struct btrfs_key root_key;
@@ -1517,7 +1523,6 @@ struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u32 blocksize);
-int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size);
int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
@@ -1582,10 +1587,29 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 bytes_used,
u64 type, u64 chunk_objectid, u64 chunk_offset,
u64 size);
+int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 group_start);
+int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start);
+int btrfs_free_reloc_root(struct btrfs_root *root);
+int btrfs_drop_dead_reloc_roots(struct btrfs_root *root);
+int btrfs_add_reloc_mapping(struct btrfs_root *root, u64 orig_bytenr,
+ u64 num_bytes, u64 new_bytenr);
+int btrfs_get_reloc_mapping(struct btrfs_root *root, u64 orig_bytenr,
+ u64 num_bytes, u64 *new_bytenr);
+void btrfs_free_reloc_mappings(struct btrfs_root *root);
+int btrfs_reloc_tree_cache_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *buf, u64 orig_start);
+int btrfs_add_dead_reloc_root(struct btrfs_root *root);
+int btrfs_cleanup_reloc_trees(struct btrfs_root *root);
/* ctree.c */
int btrfs_previous_item(struct btrfs_root *root,
struct btrfs_path *path, u64 min_objectid,
int type);
+int btrfs_merge_path(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_key *node_keys,
+ u64 *nodes, int lowest_level);
int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct btrfs_path *path,
struct btrfs_key *new_key);
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 8969fee2331..45bc3132b05 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1406,6 +1406,10 @@ struct btrfs_root *open_ctree(struct super_block *sb,
fs_info->btree_inode->i_mapping, GFP_NOFS);
fs_info->do_barriers = 1;
+ extent_io_tree_init(&fs_info->reloc_mapping_tree,
+ fs_info->btree_inode->i_mapping, GFP_NOFS);
+ INIT_LIST_HEAD(&fs_info->dead_reloc_roots);
+ btrfs_leaf_ref_tree_init(&fs_info->reloc_ref_tree);
btrfs_leaf_ref_tree_init(&fs_info->shared_ref_tree);
BTRFS_I(fs_info->btree_inode)->root = tree_root;
@@ -1421,6 +1425,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
mutex_init(&fs_info->transaction_kthread_mutex);
mutex_init(&fs_info->cleaner_mutex);
mutex_init(&fs_info->volume_mutex);
+ mutex_init(&fs_info->tree_reloc_mutex);
init_waitqueue_head(&fs_info->transaction_throttle);
init_waitqueue_head(&fs_info->transaction_wait);
init_waitqueue_head(&fs_info->async_submit_wait);
@@ -1627,6 +1632,10 @@ struct btrfs_root *open_ctree(struct super_block *sb,
ret = btrfs_recover_log_trees(log_tree_root);
BUG_ON(ret);
}
+
+ ret = btrfs_cleanup_reloc_trees(tree_root);
+ BUG_ON(ret);
+
fs_info->last_trans_committed = btrfs_super_generation(disk_super);
return tree_root;
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 9ab099bc01a..8043b9d584a 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1834,6 +1834,7 @@ static int pin_down_bytes(struct btrfs_trans_handle *trans,
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);
@@ -2487,6 +2488,7 @@ int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len)
return -ENOSPC;
}
btrfs_add_free_space(cache, start, len);
+ update_reserved_extents(root, start, len, 0);
maybe_unlock_mutex(root);
return 0;
}
@@ -2947,6 +2949,10 @@ static int noinline walk_down_tree(struct btrfs_trans_handle *trans,
*/
if (*level == 1) {
ref = btrfs_lookup_leaf_ref(root, bytenr);
+ if (ref && ref->generation != ptr_gen) {
+ btrfs_free_leaf_ref(root, ref);
+ ref = NULL;
+ }
if (ref) {
ret = cache_drop_leaf_ref(trans, root, ref);
BUG_ON(ret);
@@ -3153,34 +3159,6 @@ out:
return ret;
}
-int btrfs_free_block_groups(struct btrfs_fs_info *info)
-{
- struct btrfs_block_group_cache *block_group;
- struct rb_node *n;
-
- mutex_lock(&info->alloc_mutex);
- spin_lock(&info->block_group_cache_lock);
- while ((n = rb_last(&info->block_group_cache_tree)) != NULL) {
- block_group = rb_entry(n, struct btrfs_block_group_cache,
- cache_node);
-
- spin_unlock(&info->block_group_cache_lock);
- btrfs_remove_free_space_cache(block_group);
- spin_lock(&info->block_group_cache_lock);
-
- rb_erase(&block_group->cache_node,
- &info->block_group_cache_tree);
-
- spin_lock(&block_group->space_info->lock);
- list_del(&block_group->list);
- spin_unlock(&block_group->space_info->lock);
- kfree(block_group);
- }
- spin_unlock(&info->block_group_cache_lock);
- mutex_unlock(&info->alloc_mutex);
- return 0;
-}
-
static unsigned long calc_ra(unsigned long start, unsigned long last,
unsigned long nr)
{
@@ -3192,37 +3170,43 @@ static int noinline relocate_inode_pages(struct inode *inode, u64 start,
{
u64 page_start;
u64 page_end;
+ unsigned long first_index;
unsigned long last_index;
unsigned long i;
struct page *page;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
struct file_ra_state *ra;
- unsigned long total_read = 0;
- unsigned long ra_pages;
struct btrfs_ordered_extent *ordered;
- struct btrfs_trans_handle *trans;
+ unsigned int total_read = 0;
+ unsigned int total_dirty = 0;
+ int ret = 0;
ra = kzalloc(sizeof(*ra), GFP_NOFS);
mutex_lock(&inode->i_mutex);
- i = start >> PAGE_CACHE_SHIFT;
+ first_index = start >> PAGE_CACHE_SHIFT;
last_index = (start + len - 1) >> PAGE_CACHE_SHIFT;
- ra_pages = BTRFS_I(inode)->root->fs_info->bdi.ra_pages;
+ /* make sure the dirty trick played by the caller work */
+ ret = invalidate_inode_pages2_range(inode->i_mapping,
+ first_index, last_index);
+ if (ret)
+ goto out_unlock;
file_ra_state_init(ra, inode->i_mapping);
- for (; i <= last_index; i++) {
- if (total_read % ra_pages == 0) {
+ for (i = first_index ; i <= last_index; i++) {
+ if (total_read % ra->ra_pages == 0) {
btrfs_force_ra(inode->i_mapping, ra, NULL, i,
- calc_ra(i, last_index, ra_pages));
+ calc_ra(i, last_index, ra->ra_pages));
}
total_read++;
again:
if (((u64)i << PAGE_CACHE_SHIFT) > i_size_read(inode))
- goto truncate_racing;
+ BUG_ON(1);
page = grab_cache_page(inode->i_mapping, i);
if (!page) {
+ ret = -ENOMEM;
goto out_unlock;
}
if (!PageUptodate(page)) {
@@ -3231,6 +3215,7 @@ again:
if (!PageUptodate(page)) {
unlock_page(page);
page_cache_release(page);
+ ret = -EIO;
goto out_unlock;
}
}
@@ -3251,14 +3236,13 @@ again:
}
set_page_extent_mapped(page);
- /*
- * make sure page_mkwrite is called for this page if userland
- * wants to change it from mmap
- */
- clear_page_dirty_for_io(page);
-
btrfs_set_extent_delalloc(inode, page_start, page_end);
+ if (i == first_index)
+ set_extent_bits(io_tree, page_start, page_end,
+ EXTENT_BOUNDARY, GFP_NOFS);
+
set_page_dirty(page);
+ total_dirty++;
unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
unlock_page(page);
@@ -3266,347 +3250,1457 @@ again:
}
out_unlock:
- /* we have to start the IO in order to get the ordered extents
- * instantiated. This allows the relocation to code to wait
- * for all the ordered extents to hit the disk.
- *
- * Otherwise, it would constantly loop over the same extents
- * because the old ones don't get deleted until the IO is
- * started
- */
- btrfs_fdatawrite_range(inode->i_mapping, start, start + len - 1,
- WB_SYNC_NONE);
kfree(ra);
- trans = btrfs_start_transaction(BTRFS_I(inode)->root, 1);
- if (trans) {
- btrfs_end_transaction(trans, BTRFS_I(inode)->root);
- mark_inode_dirty(inode);
- }
mutex_unlock(&inode->i_mutex);
- return 0;
+ balance_dirty_pages_ratelimited_nr(inode->i_mapping, total_dirty);
+ return ret;
+}
+
+static int noinline relocate_data_extent(struct inode *reloc_inode,
+ struct btrfs_key *extent_key,
+ u64 offset)
+{
+ struct btrfs_root *root = BTRFS_I(reloc_inode)->root;
+ struct extent_map_tree *em_tree = &BTRFS_I(reloc_inode)->extent_tree;
+ struct extent_map *em;
+
+ em = alloc_extent_map(GFP_NOFS);
+ BUG_ON(!em || IS_ERR(em));
+
+ em->start = extent_key->objectid - offset;
+ em->len = extent_key->offset;
+ em->block_start = extent_key->objectid;
+ em->bdev = root->fs_info->fs_devices->latest_bdev;
+ set_bit(EXTENT_FLAG_PINNED, &em->flags);
+
+ /* setup extent map to cheat btrfs_readpage */
+ mutex_lock(&BTRFS_I(reloc_inode)->extent_mutex);
+ while (1) {
+ int ret;
+ spin_lock(&em_tree->lock);
+ ret = add_extent_mapping(em_tree, em);
+ spin_unlock(&em_tree->lock);
+ if (ret != -EEXIST) {
+ free_extent_map(em);
+ break;
+ }
+ btrfs_drop_extent_cache(reloc_inode, em->start,
+ em->start + em->len - 1, 0);
+ }
+ mutex_unlock(&BTRFS_I(reloc_inode)->extent_mutex);
-truncate_racing:
- vmtruncate(inode, inode->i_size);
- balance_dirty_pages_ratelimited_nr(inode->i_mapping,
- total_read);
- goto out_unlock;
+ return relocate_inode_pages(reloc_inode, extent_key->objectid - offset,
+ extent_key->offset);
}
-/*
- * The back references tell us which tree holds a ref on a block,
- * but it is possible for the tree root field in the reference to
- * reflect the original root before a snapshot was made. In this
- * case we should search through all the children of a given root
- * to find potential holders of references on a block.
- *
- * Instead, we do something a little less fancy and just search
- * all the roots for a given key/block combination.
- */
-static int find_root_for_ref(struct btrfs_root *root,
- struct btrfs_path *path,
- struct btrfs_key *key0,
- int level,
- int file_key,
- struct btrfs_root **found_root,
- u64 bytenr)
-{
- struct btrfs_key root_location;
- struct btrfs_root *cur_root = *found_root;
- struct btrfs_file_extent_item *file_extent;
- u64 root_search_start = BTRFS_FS_TREE_OBJECTID;
- u64 found_bytenr;
- int ret;
+struct btrfs_ref_path {
+ u64 extent_start;
+ u64 nodes[BTRFS_MAX_LEVEL];
+ u64 root_objectid;
+ u64 root_generation;
+ u64 owner_objectid;
+ u64 owner_offset;
+ u32 num_refs;
+ int lowest_level;
+ int current_level;
+};
- root_location.offset = (u64)-1;
- root_location.type = BTRFS_ROOT_ITEM_KEY;
- path->lowest_level = level;
- path->reada = 0;
- while(1) {
- ret = btrfs_search_slot(NULL, cur_root, key0, path, 0, 0);
- found_bytenr = 0;
- if (ret == 0 && file_key) {
- struct extent_buffer *leaf = path->nodes[0];
- file_extent = btrfs_item_ptr(leaf, path->slots[0],
- struct btrfs_file_extent_item);
- if (btrfs_file_extent_type(leaf, file_extent) ==
- BTRFS_FILE_EXTENT_REG) {
- found_bytenr =
- btrfs_file_extent_disk_bytenr(leaf,
- file_extent);
- }
- } else if (!file_key) {
- if (path->nodes[level])
- found_bytenr = path->nodes[level]->start;
- }
-
- btrfs_release_path(cur_root, path);
-
- if (found_bytenr == bytenr) {
- *found_root = cur_root;
+struct disk_extent {
+ u64 disk_bytenr;
+ u64 disk_num_bytes;
+ u64 offset;
+ u64 num_bytes;
+};
+
+static int is_cowonly_root(u64 root_objectid)
+{
+ if (root_objectid == BTRFS_ROOT_TREE_OBJECTID ||
+ root_objectid == BTRFS_EXTENT_TREE_OBJECTID ||
+ root_objectid == BTRFS_CHUNK_TREE_OBJECTID ||
+ root_objectid == BTRFS_DEV_TREE_OBJECTID ||
+ root_objectid == BTRFS_TREE_LOG_OBJECTID)
+ return 1;
+ return 0;
+}
+
+static int noinline __next_ref_path(struct btrfs_trans_handle *trans,
+ struct btrfs_root *extent_root,
+ struct btrfs_ref_path *ref_path,
+ int first_time)
+{
+ struct extent_buffer *leaf;
+ struct btrfs_path *path;
+ struct btrfs_extent_ref *ref;
+ struct btrfs_key key;
+ struct btrfs_key found_key;
+ u64 bytenr;
+ u32 nritems;
+ int level;
+ int ret = 1;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ mutex_lock(&extent_root->fs_info->alloc_mutex);
+
+ if (first_time) {
+ ref_path->lowest_level = -1;
+ ref_path->current_level = -1;
+ goto walk_up;
+ }
+walk_down:
+ level = ref_path->current_level - 1;
+ while (level >= -1) {
+ u64 parent;
+ if (level < ref_path->lowest_level)
+ break;
+
+ if (level >= 0) {
+ bytenr = ref_path->nodes[level];
+ } else {
+ bytenr = ref_path->extent_start;
+ }
+ BUG_ON(bytenr == 0);
+
+ parent = ref_path->nodes[level + 1];
+ ref_path->nodes[level + 1] = 0;
+ ref_path->current_level = level;
+ BUG_ON(parent == 0);
+
+ key.objectid = bytenr;
+ key.offset = parent + 1;
+ key.type = BTRFS_EXTENT_REF_KEY;
+
+ ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0);
+ if (ret < 0)
+ goto out;
+ BUG_ON(ret == 0);
+
+ leaf = path->nodes[0];
+ nritems = btrfs_header_nritems(leaf);
+ if (path->slots[0] >= nritems) {
+ ret = btrfs_next_leaf(extent_root, path);
+ if (ret < 0)
+ goto out;
+ if (ret > 0)
+ goto next;
+ 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 found;
+next:
+ level--;
+ btrfs_release_path(extent_root, path);
+ if (need_resched()) {
+ mutex_unlock(&extent_root->fs_info->alloc_mutex);
+ cond_resched();
+ mutex_lock(&extent_root->fs_info->alloc_mutex);
+ }
+ }
+ /* reached lowest level */
+ ret = 1;
+ goto out;
+walk_up:
+ level = ref_path->current_level;
+ while (level < BTRFS_MAX_LEVEL - 1) {
+ u64 ref_objectid;
+ if (level >= 0) {
+ bytenr = ref_path->nodes[level];
+ } else {
+ bytenr = ref_path->extent_start;
+ }
+ BUG_ON(bytenr == 0);
+
+ key.objectid = bytenr;
+ key.offset = 0;
+ key.type = BTRFS_EXTENT_REF_KEY;
+
+ ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0);
+ if (ret < 0)
+ goto out;
+
+ leaf = path->nodes[0];
+ nritems = btrfs_header_nritems(leaf);
+ if (path->slots[0] >= nritems) {
+ ret = btrfs_next_leaf(extent_root, path);
+ if (ret < 0)
+ goto out;
+ if (ret > 0) {
+ /* the extent was freed by someone */
+ if (ref_path->lowest_level == level)
+ goto out;
+ btrfs_release_path(extent_root, path);
+ goto walk_down;
+ }
+ 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) {
+ /* the extent was freed by someone */
+ if (ref_path->lowest_level == level) {
+ ret = 1;
+ goto out;
+ }
+ btrfs_release_path(extent_root, path);
+ goto walk_down;
+ }
+found:
+ ref = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_extent_ref);
+ ref_objectid = btrfs_ref_objectid(leaf, ref);
+ if (ref_objectid < BTRFS_FIRST_FREE_OBJECTID) {
+ if (first_time) {
+ level = (int)ref_objectid;
+ BUG_ON(level >= BTRFS_MAX_LEVEL);
+ ref_path->lowest_level = level;
+ ref_path->current_level = level;
+ ref_path->nodes[level] = bytenr;
+ } else {
+ WARN_ON(ref_objectid != level);
+ }
+ } else {
+ WARN_ON(level != -1);
+ }
+ first_time = 0;
+
+ if (ref_path->lowest_level == level) {
+ ref_path->owner_objectid = ref_objectid;
+ ref_path->owner_offset = btrfs_ref_offset(leaf, ref);
+ ref_path->num_refs = btrfs_ref_num_refs(leaf, ref);
+ }
+
+ /*
+ * the block is tree root or the block isn't in reference
+ * counted tree.
+ */
+ if (found_key.objectid == found_key.offset ||
+ is_cowonly_root(btrfs_ref_root(leaf, ref))) {
+ ref_path->root_objectid = btrfs_ref_root(leaf, ref);
+ ref_path->root_generation =
+ btrfs_ref_generation(leaf, ref);
+ if (level < 0) {
+ /* special reference from the tree log */
+ ref_path->nodes[0] = found_key.offset;
+ ref_path->current_level = 0;
+ }
ret = 0;
goto out;
}
- ret = btrfs_search_root(root->fs_info->tree_root,
- root_search_start, &root_search_start);
- if (ret)
- break;
- root_location.objectid = root_search_start;
- cur_root = btrfs_read_fs_root_no_name(root->fs_info,
- &root_location);
- if (!cur_root) {
- ret = 1;
- break;
+ level++;
+ BUG_ON(ref_path->nodes[level] != 0);
+ ref_path->nodes[level] = found_key.offset;
+ ref_path->current_level = level;
+
+ /*
+ * the reference was created in the running transaction,
+ * no need to continue walking up.
+ */
+ if (btrfs_ref_generation(leaf, ref) == trans->transid) {
+ ref_path->root_objectid = btrfs_ref_root(leaf, ref);
+ ref_path->root_generation =
+ btrfs_ref_generation(leaf, ref);
+ ret = 0;
+ goto out;
+ }
+
+ btrfs_release_path(extent_root, path);
+ if (need_resched()) {
+ mutex_unlock(&extent_root->fs_info->alloc_mutex);
+ cond_resched();
+ mutex_lock(&extent_root->fs_info->alloc_mutex);
}
}
+ /* reached max tree level, but no tree root found. */
+ BUG();
out:
- path->lowest_level = 0;
+ mutex_unlock(&extent_root->fs_info->alloc_mutex);
+ btrfs_free_path(path);
return ret;
}
-/*
- * note, this releases the path
- */
-static int noinline relocate_one_reference(struct btrfs_root *extent_root,
- struct btrfs_path *path,
- struct btrfs_key *extent_key,
- u64 *last_file_objectid,
- u64 *last_file_offset,
- u64 *last_file_root,
- u64 last_extent)
-{
- struct inode *inode;
- struct btrfs_root *found_root;
- struct btrfs_key root_location;
+static int btrfs_first_ref_path(struct btrfs_trans_handle *trans,
+ struct btrfs_root *extent_root,
+ struct btrfs_ref_path *ref_path,
+ u64 extent_start)
+{
+ memset(ref_path, 0, sizeof(*ref_path));
+ ref_path->extent_start = extent_start;
+
+ return __next_ref_path(trans, extent_root, ref_path, 1);
+}
+
+static int btrfs_next_ref_path(struct btrfs_trans_handle *trans,
+ struct btrfs_root *extent_root,
+ struct btrfs_ref_path *ref_path)
+{
+ return __next_ref_path(trans, extent_root, ref_path, 0);
+}
+
+static int noinline get_new_locations(struct inode *reloc_inode,
+ struct btrfs_key *extent_key,
+ u64 offset, int no_fragment,
+ struct disk_extent **extents,
+ int *nr_extents)
+{
+ struct btrfs_root *root = BTRFS_I(reloc_inode)->root;
+ struct btrfs_path *path;
+ struct btrfs_file_extent_item *fi;
+ struct extent_buffer *leaf;
+ struct disk_extent *exts = *extents;
struct btrfs_key found_key;
- struct btrfs_extent_ref *ref;
- u64 ref_root;
- u64 ref_gen;
- u64 ref_objectid;
- u64 ref_offset;
+ u64 cur_pos;
+ u64 last_byte;
+ u32 nritems;
+ int nr = 0;
+ int max = *nr_extents;
int ret;
- int level;
- WARN_ON(!mutex_is_locked(&extent_root->fs_info->alloc_mutex));
+ WARN_ON(!no_fragment && *extents);
+ if (!exts) {
+ max = 1;
+ exts = kmalloc(sizeof(*exts) * max, GFP_NOFS);
+ if (!exts)
+ return -ENOMEM;
+ }
- ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
- struct btrfs_extent_ref);
- ref_root = btrfs_ref_root(path->nodes[0], ref);
- ref_gen = btrfs_ref_generation(path->nodes[0], ref);
- ref_objectid = btrfs_ref_objectid(path->nodes[0], ref);
- ref_offset = btrfs_ref_offset(path->nodes[0], ref);
- btrfs_release_path(extent_root, path);
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
- root_location.objectid = ref_root;
- if (ref_gen == 0)
- root_location.offset = 0;
- else
- root_location.offset = (u64)-1;
- root_location.type = BTRFS_ROOT_ITEM_KEY;
+ cur_pos = extent_key->objectid - offset;
+ last_byte = extent_key->objectid + extent_key->offset;
+ ret = btrfs_lookup_file_extent(NULL, root, path, reloc_inode->i_ino,
+ cur_pos, 0);
+ if (ret < 0)
+ goto out;
+ if (ret > 0) {
+ ret = -ENOENT;
+ goto out;
+ }
- found_root = btrfs_read_fs_root_no_name(extent_root->fs_info,
- &root_location);
- BUG_ON(!found_root);
- mutex_unlock(&extent_root->fs_info->alloc_mutex);
+ while (1) {
+ leaf = path->nodes[0];
+ nritems = btrfs_header_nritems(leaf);
+ if (path->slots[0] >= nritems) {
+ ret = btrfs_next_leaf(root, path);
+ if (ret < 0)
+ goto out;
+ if (ret > 0)
+ break;
+ leaf = path->nodes[0];
+ }
- if (ref_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
- found_key.objectid = ref_objectid;
- found_key.type = BTRFS_EXTENT_DATA_KEY;
- found_key.offset = ref_offset;
- level = 0;
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+ if (found_key.offset != cur_pos ||
+ found_key.type != BTRFS_EXTENT_DATA_KEY ||
+ found_key.objectid != reloc_inode->i_ino)
+ break;
- if (last_extent == extent_key->objectid &&
- *last_file_objectid == ref_objectid &&
- *last_file_offset == ref_offset &&
- *last_file_root == ref_root)
- goto out;
+ fi = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_file_extent_item);
+ if (btrfs_file_extent_type(leaf, fi) !=
+ BTRFS_FILE_EXTENT_REG ||
+ btrfs_file_extent_disk_bytenr(leaf, fi) == 0)
+ break;
- ret = find_root_for_ref(extent_root, path, &found_key,
- level, 1, &found_root,
- extent_key->objectid);
+ if (nr == max) {
+ struct disk_extent *old = exts;
+ max *= 2;
+ exts = kzalloc(sizeof(*exts) * max, GFP_NOFS);
+ memcpy(exts, old, sizeof(*exts) * nr);
+ if (old != *extents)
+ kfree(old);
+ }
- if (ret)
+ exts[nr].disk_bytenr =
+ btrfs_file_extent_disk_bytenr(leaf, fi);
+ exts[nr].disk_num_bytes =
+ btrfs_file_extent_disk_num_bytes(leaf, fi);
+ exts[nr].offset = btrfs_file_extent_offset(leaf, fi);
+ exts[nr].num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
+ WARN_ON(exts[nr].offset > 0);
+ WARN_ON(exts[nr].num_bytes != exts[nr].disk_num_bytes);
+
+ cur_pos += exts[nr].num_bytes;
+ nr++;
+
+ if (cur_pos + offset >= last_byte)
+ break;
+
+ if (no_fragment) {
+ ret = 1;
goto out;
+ }
+ path->slots[0]++;
+ }
- if (last_extent == extent_key->objectid &&
- *last_file_objectid == ref_objectid &&
- *last_file_offset == ref_offset &&
- *last_file_root == ref_root)
+ WARN_ON(cur_pos + offset > last_byte);
+ if (cur_pos + offset < last_byte) {
+ ret = -ENOENT;
+ goto out;
+ }
+ ret = 0;
+out:
+ btrfs_free_path(path);
+ if (ret) {
+ if (exts != *extents)
+ kfree(exts);
+ } else {
+ *extents = exts;
+ *nr_extents = nr;
+ }
+ return ret;
+}
+
+static int noinline replace_one_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct btrfs_key *extent_key,
+ struct btrfs_key *leaf_key,
+ struct btrfs_ref_path *ref_path,
+ struct disk_extent *new_extents,
+ int nr_extents)
+{
+ struct extent_buffer *leaf;
+ struct btrfs_file_extent_item *fi;
+ struct inode *inode = NULL;
+ struct btrfs_key key;
+ u64 lock_start = 0;
+ u64 lock_end = 0;
+ u64 num_bytes;
+ u64 ext_offset;
+ u64 first_pos;
+ u32 nritems;
+ int extent_locked = 0;
+ int ret;
+
+ first_pos = ref_path->owner_offset;
+ if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) {
+ key.objectid = ref_path->owner_objectid;
+ key.offset = ref_path->owner_offset;
+ key.type = BTRFS_EXTENT_DATA_KEY;
+ } else {
+ memcpy(&key, leaf_key, sizeof(key));
+ }
+
+ while (1) {
+ ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
+ if (ret < 0)
goto out;
- inode = btrfs_iget_locked(extent_root->fs_info->sb,
- ref_objectid, found_root);
- if (inode->i_state & I_NEW) {
- /* the inode and parent dir are two different roots */
- BTRFS_I(inode)->root = found_root;
- BTRFS_I(inode)->location.objectid = ref_objectid;
- BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
- BTRFS_I(inode)->location.offset = 0;
- btrfs_read_locked_inode(inode);
- unlock_new_inode(inode);
+ leaf = path->nodes[0];
+ nritems = btrfs_header_nritems(leaf);
+next:
+ if (extent_locked && ret > 0) {
+ /*
+ * the file extent item was modified by someone
+ * before the extent got locked.
+ */
+ mutex_unlock(&BTRFS_I(inode)->extent_mutex);
+ unlock_extent(&BTRFS_I(inode)->io_tree, lock_start,
+ lock_end, GFP_NOFS);
+ extent_locked = 0;
+ }
+
+ if (path->slots[0] >= nritems) {
+ if (ref_path->owner_objectid ==
+ BTRFS_MULTIPLE_OBJECTIDS)
+ break;
+
+ BUG_ON(extent_locked);
+ ret = btrfs_next_leaf(root, path);
+ if (ret < 0)
+ goto out;
+ if (ret > 0)
+ break;
+ leaf = path->nodes[0];
+ nritems = btrfs_header_nritems(leaf);
+ }
+
+ btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
+ if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) {
+ if ((key.objectid > ref_path->owner_objectid) ||
+ (key.objectid == ref_path->owner_objectid &&
+ key.type > BTRFS_EXTENT_DATA_KEY) ||
+ (key.offset >= first_pos + extent_key->offset))
+ break;
}
- /* this can happen if the reference is not against
- * the latest version of the tree root
- */
- if (is_bad_inode(inode))
- goto out;
- *last_file_objectid = inode->i_ino;
- *last_file_root = found_root->root_key.objectid;
- *last_file_offset = ref_offset;
+ if (inode && key.objectid != inode->i_ino) {
+ BUG_ON(extent_locked);
+ btrfs_release_path(root, path);
+ mutex_unlock(&inode->i_mutex);
+ iput(inode);
+ inode = NULL;
+ continue;
+ }
- relocate_inode_pages(inode, ref_offset, extent_key->offset);
- iput(inode);
- } else {
- struct btrfs_trans_handle *trans;
- struct extent_buffer *eb;
- int needs_lock = 0;
+ if (key.type != BTRFS_EXTENT_DATA_KEY) {
+ path->slots[0]++;
+ ret = 1;
+ goto next;
+ }
+ fi = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_file_extent_item);
+ if ((btrfs_file_extent_type(leaf, fi) !=
+ BTRFS_FILE_EXTENT_REG) ||
+ (btrfs_file_extent_disk_bytenr(leaf, fi) !=
+ extent_key->objectid)) {
+ path->slots[0]++;
+ ret = 1;
+ goto next;
+ }
- eb = read_tree_block(found_root, extent_key->objectid,
- extent_key->offset, 0);
- btrfs_tree_lock(eb);
- level = btrfs_header_level(eb);
+ num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
+ ext_offset = btrfs_file_extent_offset(leaf, fi);
- if (level == 0)
- btrfs_item_key_to_cpu(eb, &found_key, 0);
- else
- btrfs_node_key_to_cpu(eb, &found_key, 0);
+ if (first_pos > key.offset - ext_offset)
+ first_pos = key.offset - ext_offset;
- btrfs_tree_unlock(eb);
- free_extent_buffer(eb);
+ if (!extent_locked) {
+ lock_start = key.offset;
+ lock_end = lock_start + num_bytes - 1;
+ } else {
+ BUG_ON(lock_start != key.offset);
+ BUG_ON(lock_end - lock_start + 1 < num_bytes);
+ }
+
+ if (!inode) {
+ btrfs_release_path(root, path);
+
+ inode = btrfs_iget_locked(root->fs_info->sb,
+ key.objectid, root);
+ if (inode->i_state & I_NEW) {
+ BTRFS_I(inode)->root = root;
+ BTRFS_I(inode)->location.objectid =
+ key.objectid;
+ BTRFS_I(inode)->location.type =
+ BTRFS_INODE_ITEM_KEY;
+ BTRFS_I(inode)->location.offset = 0;
+ btrfs_read_locked_inode(inode);
+ unlock_new_inode(inode);
+ }
+ /*
+ * some code call btrfs_commit_transaction while
+ * holding the i_mutex, so we can't use mutex_lock
+ * here.
+ */
+ if (is_bad_inode(inode) ||
+ !mutex_trylock(&inode->i_mutex)) {
+ iput(inode);
+ inode = NULL;
+ key.offset = (u64)-1;
+ goto skip;
+ }
+ }
+
+ if (!extent_locked) {
+ struct btrfs_ordered_extent *ordered;
+
+ btrfs_release_path(root, path);
- ret = find_root_for_ref(extent_root, path, &found_key,
- level, 0, &found_root,
- extent_key->objectid);
+ lock_extent(&BTRFS_I(inode)->io_tree, lock_start,
+ lock_end, GFP_NOFS);
+ ordered = btrfs_lookup_first_ordered_extent(inode,
+ lock_end);
+ if (ordered &&
+ ordered->file_offset <= lock_end &&
+ ordered->file_offset + ordered->len > lock_start) {
+ unlock_extent(&BTRFS_I(inode)->io_tree,
+ lock_start, lock_end, GFP_NOFS);
+ btrfs_start_ordered_extent(inode, ordered, 1);
+ btrfs_put_ordered_extent(ordered);
+ key.offset += num_bytes;
+ goto skip;
+ }
+ if (ordered)
+ btrfs_put_ordered_extent(ordered);
+
+ mutex_lock(&BTRFS_I(inode)->extent_mutex);
+ extent_locked = 1;
+ continue;
+ }
+ if (nr_extents == 1) {
+ /* update extent pointer in place */
+ btrfs_set_file_extent_generation(leaf, fi,
+ trans->transid);
+ btrfs_set_file_extent_disk_bytenr(leaf, fi,
+ new_extents[0].disk_bytenr);
+ btrfs_set_file_extent_disk_num_bytes(leaf, fi,
+ new_extents[0].disk_num_bytes);
+ ext_offset += new_extents[0].offset;
+ btrfs_set_file_extent_offset(leaf, fi, ext_offset);
+ btrfs_mark_buffer_dirty(leaf);
+
+ btrfs_drop_extent_cache(inode, key.offset,
+ key.offset + num_bytes - 1, 0);
+
+ ret = btrfs_inc_extent_ref(trans, root,
+ new_extents[0].disk_bytenr,
+ new_extents[0].disk_num_bytes,
+ leaf->start,
+ root->root_key.objectid,
+ trans->transid,
+ key.objectid, key.offset);
+ BUG_ON(ret);
+
+ ret = btrfs_free_extent(trans, root,
+ extent_key->objectid,
+ extent_key->offset,
+ leaf->start,
+ btrfs_header_owner(leaf),
+ btrfs_header_generation(leaf),
+ key.objectid, key.offset, 0);
+ BUG_ON(ret);
+
+ btrfs_release_path(root, path);
+ key.offset += num_bytes;
+ } else {
+ u64 alloc_hint;
+ u64 extent_len;
+ int i;
+ /*
+ * drop old extent pointer at first, then insert the
+ * new pointers one bye one
+ */
+ btrfs_release_path(root, path);
+ ret = btrfs_drop_extents(trans, root, inode, key.offset,
+ key.offset + num_bytes,
+ key.offset, &alloc_hint);
+ BUG_ON(ret);
+
+ for (i = 0; i < nr_extents; i++) {
+ if (ext_offset >= new_extents[i].num_bytes) {
+ ext_offset -= new_extents[i].num_bytes;
+ continue;
+ }
+ extent_len = min(new_extents[i].num_bytes -
+ ext_offset, num_bytes);
+
+ ret = btrfs_insert_empty_item(trans, root,
+ path, &key,
+ sizeof(*fi));
+ BUG_ON(ret);
+
+ leaf = path->nodes[0];
+ fi = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_file_extent_item);
+ btrfs_set_file_extent_generation(leaf, fi,
+ trans->transid);
+ btrfs_set_file_extent_type(leaf, fi,
+ BTRFS_FILE_EXTENT_REG);
+ btrfs_set_file_extent_disk_bytenr(leaf, fi,
+ new_extents[i].disk_bytenr);
+ btrfs_set_file_extent_disk_num_bytes(leaf, fi,
+ new_extents[i].disk_num_bytes);
+ btrfs_set_file_extent_num_bytes(leaf, fi,
+ extent_len);
+ ext_offset += new_extents[i].offset;
+ btrfs_set_file_extent_offset(leaf, fi,
+ ext_offset);
+ btrfs_mark_buffer_dirty(leaf);
+
+ btrfs_drop_extent_cache(inode, key.offset,
+ key.offset + extent_len - 1, 0);
+
+ ret = btrfs_inc_extent_ref(trans, root,
+ new_extents[i].disk_bytenr,
+ new_extents[i].disk_num_bytes,
+ leaf->start,
+ root->root_key.objectid,
+ trans->transid,
+ key.objectid, key.offset);
+ BUG_ON(ret);
+ btrfs_release_path(root, path);
+
+ inode->i_blocks += extent_len >> 9;
+
+ ext_offset = 0;
+ num_bytes -= extent_len;
+ key.offset += extent_len;
+
+ if (num_bytes == 0)
+ break;
+ }
+ BUG_ON(i >= nr_extents);
+ }
+
+ if (extent_locked) {
+ mutex_unlock(&BTRFS_I(inode)->extent_mutex);
+ unlock_extent(&BTRFS_I(inode)->io_tree, lock_start,
+ lock_end, GFP_NOFS);
+ extent_locked = 0;
+ }
+skip:
+ if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS &&
+ key.offset >= first_pos + extent_key->offset)
+ break;
+
+ cond_resched();
+ }
+ ret = 0;
+out:
+ btrfs_release_path(root, path);
+ if (inode) {
+ mutex_unlock(&inode->i_mutex);
+ if (extent_locked) {
+ mutex_unlock(&BTRFS_I(inode)->extent_mutex);
+ unlock_extent(&BTRFS_I(inode)->io_tree, lock_start,
+ lock_end, GFP_NOFS);
+ }
+ iput(inode);
+ }
+ return ret;
+}
+
+int btrfs_add_reloc_mapping(struct btrfs_root *root, u64 orig_bytenr,
+ u64 num_bytes, u64 new_bytenr)
+{
+ set_extent_bits(&root->fs_info->reloc_mapping_tree,
+ orig_bytenr, orig_bytenr + num_bytes - 1,
+ EXTENT_LOCKED, GFP_NOFS);
+ set_state_private(&root->fs_info->reloc_mapping_tree,
+ orig_bytenr, new_bytenr);
+ return 0;
+}
+
+int btrfs_get_reloc_mapping(struct btrfs_root *root, u64 orig_bytenr,
+ u64 num_bytes, u64 *new_bytenr)
+{
+ u64 bytenr;
+ u64 cur_bytenr = orig_bytenr;
+ u64 prev_bytenr = orig_bytenr;
+ int ret;
+
+ while (1) {
+ ret = get_state_private(&root->fs_info->reloc_mapping_tree,
+ cur_bytenr, &bytenr);
if (ret)
- goto out;
+ break;
+ prev_bytenr = cur_bytenr;
+ cur_bytenr = bytenr;
+ }
- /*
- * right here almost anything could happen to our key,
- * but that's ok. The cow below will either relocate it
- * or someone else will have relocated it. Either way,
- * it is in a different spot than it was before and
- * we're happy.
- */
+ if (orig_bytenr == cur_bytenr)
+ return -ENOENT;
- trans = btrfs_start_transaction(found_root, 1);
+ if (prev_bytenr != orig_bytenr) {
+ set_state_private(&root->fs_info->reloc_mapping_tree,
+ orig_bytenr, cur_bytenr);
+ }
+ *new_bytenr = cur_bytenr;
+ return 0;
+}
- if (found_root == extent_root->fs_info->extent_root ||
- found_root == extent_root->fs_info->chunk_root ||
- found_root == extent_root->fs_info->dev_root) {
- needs_lock = 1;
- mutex_lock(&extent_root->fs_info->alloc_mutex);
+void btrfs_free_reloc_mappings(struct btrfs_root *root)
+{
+ clear_extent_bits(&root->fs_info->reloc_mapping_tree,
+ 0, (u64)-1, -1, GFP_NOFS);
+}
+
+int btrfs_reloc_tree_cache_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *buf, u64 orig_start)
+{
+ int level;
+ int ret;
+
+ BUG_ON(btrfs_header_generation(buf) != trans->transid);
+ BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID);
+
+ level = btrfs_header_level(buf);
+ if (level == 0) {
+ struct btrfs_leaf_ref *ref;
+ struct btrfs_leaf_ref *orig_ref;
+
+ orig_ref = btrfs_lookup_leaf_ref(root, orig_start);
+ if (!orig_ref)
+ return -ENOENT;
+
+ ref = btrfs_alloc_leaf_ref(root, orig_ref->nritems);
+ if (!ref) {
+ btrfs_free_leaf_ref(root, orig_ref);
+ return -ENOMEM;
}
- path->lowest_level = level;
- path->reada = 2;
- ret = btrfs_search_slot(trans, found_root, &found_key, path,
- 0, 1);
+ ref->nritems = orig_ref->nritems;
+ memcpy(ref->extents, orig_ref->extents,
+ sizeof(ref->extents[0]) * ref->nritems);
+
+ btrfs_free_leaf_ref(root, orig_ref);
+
+ ref->root_gen = trans->transid;
+ ref->bytenr = buf->start;
+ ref->owner = btrfs_header_owner(buf);
+ ref->generation = btrfs_header_generation(buf);
+ ret = btrfs_add_leaf_ref(root, ref, 0);
+ WARN_ON(ret);
+ btrfs_free_leaf_ref(root, ref);
+ }
+ return 0;
+}
+
+static int noinline invalidate_extent_cache(struct btrfs_root *root,
+ struct extent_buffer *leaf,
+ struct btrfs_block_group_cache *group,
+ struct btrfs_root *target_root)
+{
+ struct btrfs_key key;
+ struct inode *inode = NULL;
+ struct btrfs_file_extent_item *fi;
+ u64 num_bytes;
+ u64 skip_objectid = 0;
+ u32 nritems;
+ u32 i;
+
+ nritems = btrfs_header_nritems(leaf);
+ for (i = 0; i < nritems; i++) {
+ btrfs_item_key_to_cpu(leaf, &key, i);
+ if (key.objectid == skip_objectid ||
+ key.type != BTRFS_EXTENT_DATA_KEY)
+ continue;
+ fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item);
+ if (btrfs_file_extent_type(leaf, fi) ==
+ BTRFS_FILE_EXTENT_INLINE)
+ continue;
+ if (btrfs_file_extent_disk_bytenr(leaf, fi) == 0)
+ continue;
+ if (!inode || inode->i_ino != key.objectid) {
+ iput(inode);
+ inode = btrfs_ilookup(target_root->fs_info->sb,
+ key.objectid, target_root, 1);
+ }
+ if (!inode) {
+ skip_objectid = key.objectid;
+ continue;
+ }
+ num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
+
+ lock_extent(&BTRFS_I(inode)->io_tree, key.offset,
+ key.offset + num_bytes - 1, GFP_NOFS);
+ mutex_lock(&BTRFS_I(inode)->extent_mutex);
+ btrfs_drop_extent_cache(inode, key.offset,
+ key.offset + num_bytes - 1, 1);
+ mutex_unlock(&BTRFS_I(inode)->extent_mutex);
+ unlock_extent(&BTRFS_I(inode)->io_tree, key.offset,
+ key.offset + num_bytes - 1, GFP_NOFS);
+ cond_resched();
+ }
+ iput(inode);
+ return 0;
+}
+
+static int noinline replace_extents_in_leaf(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *leaf,
+ struct btrfs_block_group_cache *group,
+ struct inode *reloc_inode)
+{
+ struct btrfs_key key;
+ struct btrfs_key extent_key;
+ struct btrfs_file_extent_item *fi;
+ struct btrfs_leaf_ref *ref;
+ struct disk_extent *new_extent;
+ u64 bytenr;
+ u64 num_bytes;
+ u32 nritems;
+ u32 i;
+ int ext_index;
+ int nr_extent;
+ int ret;
+
+ new_extent = kmalloc(sizeof(*new_extent), GFP_NOFS);
+ BUG_ON(!new_extent);
+
+ ref = btrfs_lookup_leaf_ref(root, leaf->start);
+ BUG_ON(!ref);
+
+ ext_index = -1;
+ nritems = btrfs_header_nritems(leaf);
+ for (i = 0; i < nritems; i++) {
+ btrfs_item_key_to_cpu(leaf, &key, i);
+ if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
+ continue;
+ fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item);
+ if (btrfs_file_extent_type(leaf, fi) ==
+ BTRFS_FILE_EXTENT_INLINE)
+ continue;
+ bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
+ num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
+ if (bytenr == 0)
+ continue;
+
+ ext_index++;
+ if (bytenr >= group->key.objectid + group->key.offset ||
+ bytenr + num_bytes <= group->key.objectid)
+ continue;
+
+ extent_key.objectid = bytenr;
+ extent_key.offset = num_bytes;
+ extent_key.type = BTRFS_EXTENT_ITEM_KEY;
+ nr_extent = 1;
+ ret = get_new_locations(reloc_inode, &extent_key,
+ group->key.objectid, 1,
+ &new_extent, &nr_extent);
+ if (ret > 0)
+ continue;
+ BUG_ON(ret < 0);
+
+ BUG_ON(ref->extents[ext_index].bytenr != bytenr);
+ BUG_ON(ref->extents[ext_index].num_bytes != num_bytes);
+ ref->extents[ext_index].bytenr = new_extent->disk_bytenr;
+ ref->extents[ext_index].num_bytes = new_extent->disk_num_bytes;
+
+ btrfs_set_file_extent_generation(leaf, fi, trans->transid);
+ btrfs_set_file_extent_disk_bytenr(leaf, fi,
+ new_extent->disk_bytenr);
+ btrfs_set_file_extent_disk_num_bytes(leaf, fi,
+ new_extent->disk_num_bytes);
+ new_extent->offset += btrfs_file_extent_offset(leaf, fi);
+ btrfs_set_file_extent_offset(leaf, fi, new_extent->offset);
+ btrfs_mark_buffer_dirty(leaf);
+
+ ret = btrfs_inc_extent_ref(trans, root,
+ new_extent->disk_bytenr,
+ new_extent->disk_num_bytes,
+ leaf->start,
+ root->root_key.objectid,
+ trans->transid,
+ key.objectid, key.offset);
+ BUG_ON(ret);
+ ret = btrfs_free_extent(trans, root,
+ bytenr, num_bytes, leaf->start,
+ btrfs_header_owner(leaf),
+ btrfs_header_generation(leaf),
+ key.objectid, key.offset, 0);
+ BUG_ON(ret);
+ cond_resched();
+ }
+ kfree(new_extent);
+ BUG_ON(ext_index + 1 != ref->nritems);
+ btrfs_free_leaf_ref(root, ref);
+ return 0;
+}
+
+int btrfs_free_reloc_root(struct btrfs_root *root)
+{
+ struct btrfs_root *reloc_root;
+
+ if (root->reloc_root) {
+ reloc_root = root->reloc_root;
+ root->reloc_root = NULL;
+ list_add(&reloc_root->dead_list,
+ &root->fs_info->dead_reloc_roots);
+ }
+ return 0;
+}
+
+int btrfs_drop_dead_reloc_roots(struct btrfs_root *root)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *reloc_root;
+ struct btrfs_root *prev_root = NULL;
+ struct list_head dead_roots;
+ int ret;
+ unsigned long nr;
+
+ INIT_LIST_HEAD(&dead_roots);
+ list_splice_init(&root->fs_info->dead_reloc_roots, &dead_roots);
+
+ while (!list_empty(&dead_roots)) {
+ reloc_root = list_entry(dead_roots.prev,
+ struct btrfs_root, dead_list);
+ list_del_init(&reloc_root->dead_list);
+
+ BUG_ON(reloc_root->commit_root != NULL);
+ while (1) {
+ trans = btrfs_join_transaction(root, 1);
+ BUG_ON(!trans);
+
+ mutex_lock(&root->fs_info->drop_mutex);
+ ret = btrfs_drop_snapshot(trans, reloc_root);
+ if (ret != -EAGAIN)
+ break;
+ mutex_unlock(&root->fs_info->drop_mutex);
+
+ nr = trans->blocks_used;
+ ret = btrfs_end_transaction(trans, root);
+ BUG_ON(ret);
+ btrfs_btree_balance_dirty(root, nr);
+ }
+
+ free_extent_buffer(reloc_root->node);
+
+ ret = btrfs_del_root(trans, root->fs_info->tree_root,
+ &reloc_root->root_key);
+ BUG_ON(ret);
+ mutex_unlock(&root->fs_info->drop_mutex);
+
+ nr = trans->blocks_used;
+ ret = btrfs_end_transaction(trans, root);
+ BUG_ON(ret);
+ btrfs_btree_balance_dirty(root, nr);
+
+ kfree(prev_root);
+ prev_root = reloc_root;
+ }
+ if (prev_root) {
+ btrfs_remove_leaf_refs(prev_root, (u64)-1, 0);
+ kfree(prev_root);
+ }
+ return 0;
+}
+
+int btrfs_add_dead_reloc_root(struct btrfs_root *root)
+{
+ list_add(&root->dead_list, &root->fs_info->dead_reloc_roots);
+ return 0;
+}
+
+int btrfs_cleanup_reloc_trees(struct btrfs_root *root)
+{
+ struct btrfs_root *reloc_root;
+ struct btrfs_trans_handle *trans;
+ struct btrfs_key location;
+ int found;
+ int ret;
+
+ mutex_lock(&root->fs_info->tree_reloc_mutex);
+ ret = btrfs_find_dead_roots(root, BTRFS_TREE_RELOC_OBJECTID, NULL);
+ BUG_ON(ret);
+ found = !list_empty(&root->fs_info->dead_reloc_roots);
+ mutex_unlock(&root->fs_info->tree_reloc_mutex);
+
+ if (found) {
+ trans = btrfs_start_transaction(root, 1);
+ BUG_ON(!trans);
+ ret = btrfs_commit_transaction(trans, root);
+ BUG_ON(ret);
+ }
+
+ location.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID;
+ location.offset = (u64)-1;
+ location.type = BTRFS_ROOT_ITEM_KEY;
+
+ reloc_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
+ BUG_ON(!reloc_root);
+ btrfs_orphan_cleanup(reloc_root);
+ return 0;
+}
+
+static int noinline init_reloc_tree(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root)
+{
+ struct btrfs_root *reloc_root;
+ struct extent_buffer *eb;
+ struct btrfs_root_item *root_item;
+ struct btrfs_key root_key;
+ int ret;
+
+ BUG_ON(!root->ref_cows);
+ if (root->reloc_root)
+ return 0;
+
+ root_item = kmalloc(sizeof(*root_item), GFP_NOFS);
+ BUG_ON(!root_item);
+
+ ret = btrfs_copy_root(trans, root, root->commit_root,
+ &eb, BTRFS_TREE_RELOC_OBJECTID);
+ BUG_ON(ret);
+
+ root_key.objectid = BTRFS_TREE_RELOC_OBJECTID;
+ root_key.offset = root->root_key.objectid;
+ root_key.type = BTRFS_ROOT_ITEM_KEY;
+
+ memcpy(root_item, &root->root_item, sizeof(root_item));
+ btrfs_set_root_refs(root_item, 0);
+ btrfs_set_root_bytenr(root_item, eb->start);
+ btrfs_set_root_level(root_item, btrfs_header_level(eb));
+ memset(&root_item->drop_progress, 0, sizeof(root_item->drop_progress));
+ root_item->drop_level = 0;
+
+ btrfs_tree_unlock(eb);
+ free_extent_buffer(eb);
+
+ ret = btrfs_insert_root(trans, root->fs_info->tree_root,
+ &root_key, root_item);
+ BUG_ON(ret);
+ kfree(root_item);
+
+ reloc_root = btrfs_read_fs_root_no_radix(root->fs_info->tree_root,
+ &root_key);
+ BUG_ON(!reloc_root);
+ reloc_root->last_trans = trans->transid;
+ reloc_root->commit_root = NULL;
+ reloc_root->ref_tree = &root->fs_info->reloc_ref_tree;
+
+ root->reloc_root = reloc_root;
+ return 0;
+}
+
+/*
+ * Core function of space balance.
+ *
+ * The idea is using reloc trees to relocate tree blocks in reference
+ * counted roots. There is one reloc tree for each subvol, all reloc
+ * trees share same key objectid. Reloc trees are snapshots of the
+ * latest committed roots (subvol root->commit_root). To relocate a tree
+ * block referenced by a subvol, the code COW the block through the reloc
+ * tree, then update pointer in the subvol to point to the new block.
+ * Since all reloc trees share same key objectid, we can easily do special
+ * handing to share tree blocks between reloc trees. Once a tree block has
+ * been COWed in one reloc tree, we can use the result when the same block
+ * is COWed again through other reloc trees.
+ */
+static int noinline relocate_one_path(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct btrfs_key *first_key,
+ struct btrfs_ref_path *ref_path,
+ struct btrfs_block_group_cache *group,
+ struct inode *reloc_inode)
+{
+ struct btrfs_root *reloc_root;
+ struct extent_buffer *eb = NULL;
+ struct btrfs_key *keys;
+ u64 *nodes;
+ int level;
+ int lowest_merge;
+ int lowest_level = 0;
+ int update_refs;
+ int ret;
+
+ if (ref_path->owner_objectid < BTRFS_FIRST_FREE_OBJECTID)
+ lowest_level = ref_path->owner_objectid;
+
+ if (is_cowonly_root(ref_path->root_objectid)) {
+ path->lowest_level = lowest_level;
+ ret = btrfs_search_slot(trans, root, first_key, path, 0, 1);
+ BUG_ON(ret < 0);
path->lowest_level = 0;
- btrfs_release_path(found_root, path);
+ btrfs_release_path(root, path);
+ return 0;
+ }
- if (found_root == found_root->fs_info->extent_root)
- btrfs_extent_post_op(trans, found_root);
- if (needs_lock)
- mutex_unlock(&extent_root->fs_info->alloc_mutex);
+ keys = kzalloc(sizeof(*keys) * BTRFS_MAX_LEVEL, GFP_NOFS);
+ BUG_ON(!keys);
+ nodes = kzalloc(sizeof(*nodes) * BTRFS_MAX_LEVEL, GFP_NOFS);
+ BUG_ON(!nodes);
+
+ mutex_lock(&root->fs_info->tree_reloc_mutex);
+ ret = init_reloc_tree(trans, root);
+ BUG_ON(ret);
+ reloc_root = root->reloc_root;
+
+ path->lowest_level = lowest_level;
+ ret = btrfs_search_slot(trans, reloc_root, first_key, path, 0, 0);
+ BUG_ON(ret);
+ /*
+ * get relocation mapping for tree blocks in the path
+ */
+ lowest_merge = BTRFS_MAX_LEVEL;
+ for (level = BTRFS_MAX_LEVEL - 1; level >= lowest_level; level--) {
+ u64 new_bytenr;
+ eb = path->nodes[level];
+ if (!eb || eb == reloc_root->node)
+ continue;
+ ret = btrfs_get_reloc_mapping(reloc_root, eb->start, eb->len,
+ &new_bytenr);
+ if (ret)
+ continue;
+ if (level == 0)
+ btrfs_item_key_to_cpu(eb, &keys[level], 0);
+ else
+ btrfs_node_key_to_cpu(eb, &keys[level], 0);
+ nodes[level] = new_bytenr;
+ lowest_merge = level;
+ }
- btrfs_end_transaction(trans, found_root);
+ update_refs = 0;
+ if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
+ eb = path->nodes[0];
+ if (btrfs_header_generation(eb) < trans->transid)
+ update_refs = 1;
+ }
+ btrfs_release_path(reloc_root, path);
+ /*
+ * merge tree blocks that already relocated in other reloc trees
+ */
+ if (lowest_merge != BTRFS_MAX_LEVEL) {
+ ret = btrfs_merge_path(trans, reloc_root, keys, nodes,
+ lowest_merge);
+ BUG_ON(ret < 0);
}
-out:
- mutex_lock(&extent_root->fs_info->alloc_mutex);
+ /*
+ * cow any tree blocks that still haven't been relocated
+ */
+ ret = btrfs_search_slot(trans, reloc_root, first_key, path, 0, 1);
+ BUG_ON(ret);
+ /*
+ * if we are relocating data block group, update extent pointers
+ * in the newly created tree leaf.
+ */
+ eb = path->nodes[0];
+ if (update_refs && nodes[0] != eb->start) {
+ ret = replace_extents_in_leaf(trans, reloc_root, eb, group,
+ reloc_inode);
+ BUG_ON(ret);
+ }
+
+ memset(keys, 0, sizeof(*keys) * BTRFS_MAX_LEVEL);
+ memset(nodes, 0, sizeof(*nodes) * BTRFS_MAX_LEVEL);
+ for (level = BTRFS_MAX_LEVEL - 1; level >= lowest_level; level--) {
+ eb = path->nodes[level];
+ if (!eb || eb == reloc_root->node)
+ continue;
+ BUG_ON(btrfs_header_owner(eb) != BTRFS_TREE_RELOC_OBJECTID);
+ nodes[level] = eb->start;
+ if (level == 0)
+ btrfs_item_key_to_cpu(eb, &keys[level], 0);
+ else
+ btrfs_node_key_to_cpu(eb, &keys[level], 0);
+ }
+
+ if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
+ eb = path->nodes[0];
+ extent_buffer_get(eb);
+ }
+ btrfs_release_path(reloc_root, path);
+ /*
+ * replace tree blocks in the fs tree with tree blocks in
+ * the reloc tree.
+ */
+ ret = btrfs_merge_path(trans, root, keys, nodes, lowest_level);
+ BUG_ON(ret < 0);
+
+ if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
+ ret = invalidate_extent_cache(reloc_root, eb, group, root);
+ BUG_ON(ret);
+ free_extent_buffer(eb);
+ }
+ mutex_unlock(&root->fs_info->tree_reloc_mutex);
+
+ path->lowest_level = 0;
+ kfree(nodes);
+ kfree(keys);
+ return 0;
+}
+
+static int noinline relocate_tree_block(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct btrfs_key *first_key,
+ struct btrfs_ref_path *ref_path)
+{
+ int ret;
+ int needs_lock = 0;
+
+ if (root == root->fs_info->extent_root ||
+ root == root->fs_info->chunk_root ||
+ root == root->fs_info->dev_root) {
+ needs_lock = 1;
+ mutex_lock(&root->fs_info->alloc_mutex);
+ }
+
+ ret = relocate_one_path(trans, root, path, first_key,
+ ref_path, NULL, NULL);
+ BUG_ON(ret);
+
+ if (root == root->fs_info->extent_root)
+ btrfs_extent_post_op(trans, root);
+ if (needs_lock)
+ mutex_unlock(&root->fs_info->alloc_mutex);
+
return 0;
}
-static int noinline del_extent_zero(struct btrfs_root *extent_root,
+static int noinline del_extent_zero(struct btrfs_trans_handle *trans,
+ struct btrfs_root *extent_root,
struct btrfs_path *path,
struct btrfs_key *extent_key)
{
int ret;
- struct btrfs_trans_handle *trans;
- trans = btrfs_start_transaction(extent_root, 1);
+ mutex_lock(&extent_root->fs_info->alloc_mutex);
ret = btrfs_search_slot(trans, extent_root, extent_key, path, -1, 1);
- if (ret > 0) {
- ret = -EIO;
- goto out;
- }
- if (ret < 0)
+ if (ret)
goto out;
ret = btrfs_del_item(trans, extent_root, path);
out:
- btrfs_end_transaction(trans, extent_root);
+ btrfs_release_path(extent_root, path);
+ mutex_unlock(&extent_root->fs_info->alloc_mutex);
return ret;
}
+static struct btrfs_root noinline *read_ref_root(struct btrfs_fs_info *fs_info,
+ struct btrfs_ref_path *ref_path)
+{
+ struct btrfs_key root_key;
+
+ root_key.objectid = ref_path->root_objectid;
+ root_key.type = BTRFS_ROOT_ITEM_KEY;
+ if (is_cowonly_root(ref_path->root_objectid))
+ root_key.offset = 0;
+ else
+ root_key.offset = (u64)-1;
+
+ return btrfs_read_fs_root_no_name(fs_info, &root_key);
+}
+
static int noinline relocate_one_extent(struct btrfs_root *extent_root,
struct btrfs_path *path,
- struct btrfs_key *extent_key)
+ struct btrfs_key *extent_key,
+ struct btrfs_block_group_cache *group,
+ struct inode *reloc_inode, int pass)
{
- struct btrfs_key key;
- struct btrfs_key found_key;
- struct extent_buffer *leaf;
- u64 last_file_objectid = 0;
- u64 last_file_root = 0;
- u64 last_file_offset = (u64)-1;
- u64 last_extent = 0;
- u32 nritems;
- u32 item_size;
- int ret = 0;
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *found_root;
+ struct btrfs_ref_path *ref_path = NULL;
+ struct disk_extent *new_extents = NULL;
+ int nr_extents = 0;
+ int loops;
+ int ret;
+ int level;
+ struct btrfs_key first_key;
+ u64 prev_block = 0;
+
+ mutex_unlock(&extent_root->fs_info->alloc_mutex);
+
+ trans = btrfs_start_transaction(extent_root, 1);
+ BUG_ON(!trans);
if (extent_key->objectid == 0) {
- ret = del_extent_zero(extent_root, path, extent_key);
+ ret = del_extent_zero(trans, extent_root, path, extent_key);
goto out;
}
- key.objectid = extent_key->objectid;
- key.type = BTRFS_EXTENT_REF_KEY;
- key.offset = 0;
- while(1) {
- ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
+ ref_path = kmalloc(sizeof(*ref_path), GFP_NOFS);
+ if (!ref_path) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ for (loops = 0; ; loops++) {
+ if (loops == 0) {
+ ret = btrfs_first_ref_path(trans, extent_root, ref_path,
+ extent_key->objectid);
+ } else {
+ ret = btrfs_next_ref_path(trans, extent_root, ref_path);
+ }
if (ret < 0)
goto out;
+ if (ret > 0)
+ break;
- ret = 0;
- leaf = path->nodes[0];
- nritems = btrfs_header_nritems(leaf);
- if (path->slots[0] == nritems) {
- ret = btrfs_next_leaf(extent_root, path);
- if (ret > 0) {
- ret = 0;
- goto out;
+ if (ref_path->root_objectid == BTRFS_TREE_LOG_OBJECTID ||
+ ref_path->root_objectid == BTRFS_TREE_RELOC_OBJECTID)
+ continue;
+
+ found_root = read_ref_root(extent_root->fs_info, ref_path);
+ BUG_ON(!found_root);
+ /*
+ * for reference counted tree, only process reference paths
+ * rooted at the latest committed root.
+ */
+ if (found_root->ref_cows &&
+ ref_path->root_generation != found_root->root_key.offset)
+ continue;
+
+ if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
+ if (pass == 0) {
+ /*
+ * copy data extents to new locations
+ */
+ u64 group_start = group->key.objectid;
+ ret = relocate_data_extent(reloc_inode,
+ extent_key,
+ group_start);
+ if (ret < 0)
+ goto out;
+ break;
}
- if (ret < 0)
- goto out;
- leaf = path->nodes[0];
+ level = 0;
+ } else {
+ level = ref_path->owner_objectid;
}
- btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
- if (found_key.objectid != extent_key->objectid) {
- break;
- }
+ if (prev_block != ref_path->nodes[level]) {
+ struct extent_buffer *eb;
+ u64 block_start = ref_path->nodes[level];
+ u64 block_size = btrfs_level_size(found_root, level);
- if (found_key.type != BTRFS_EXTENT_REF_KEY) {
- break;
+ eb = read_tree_block(found_root, block_start,
+ block_size, 0);
+ btrfs_tree_lock(eb);
+ BUG_ON(level != btrfs_header_level(eb));
+
+ if (level == 0)
+ btrfs_item_key_to_cpu(eb, &first_key, 0);
+ else
+ btrfs_node_key_to_cpu(eb, &first_key, 0);
+
+ btrfs_tree_unlock(eb);
+ free_extent_buffer(eb);
+ prev_block = block_start;
}
- key.offset = found_key.offset + 1;
- item_size = btrfs_item_size_nr(leaf, path->slots[0]);
+ if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID &&
+ pass >= 2) {
+ /*
+ * use fallback method to process the remaining
+ * references.
+ */
+ if (!new_extents) {
+ u64 group_start = group->key.objectid;
+ ret = get_new_locations(reloc_inode,
+ extent_key,
+ group_start, 0,
+ &new_extents,
+ &nr_extents);
+ if (ret < 0)
+ goto out;
+ }
+ btrfs_record_root_in_trans(found_root);
+ ret = replace_one_extent(trans, found_root,
+ path, extent_key,
+ &first_key, ref_path,
+ new_extents, nr_extents);
+ if (ret < 0)
+ goto out;
+ continue;
+ }
- ret = relocate_one_reference(extent_root, path, extent_key,
- &last_file_objectid,
- &last_file_offset,
- &last_file_root, last_extent);
- if (ret)
+ btrfs_record_root_in_trans(found_root);
+ if (ref_path->owner_objectid < BTRFS_FIRST_FREE_OBJECTID) {
+ ret = relocate_tree_block(trans, found_root, path,
+ &first_key, ref_path);
+ } else {
+ /*
+ * try to update data extent references while
+ * keeping metadata shared between snapshots.
+ */
+ ret = relocate_one_path(trans, found_root, path,
+ &first_key, ref_path,
+ group, reloc_inode);
+ }
+ if (ret < 0)
goto out;
- last_extent = extent_key->objectid;
}
ret = 0;
out:
- btrfs_release_path(extent_root, path);
+ btrfs_end_transaction(trans, extent_root);
+ kfree(new_extents);
+ kfree(ref_path);
+ mutex_lock(&extent_root->fs_info->alloc_mutex);
return ret;
}
@@ -3686,84 +4780,155 @@ int __alloc_chunk_for_shrink(struct btrfs_root *root,
return 0;
}
-int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 shrink_start)
+static int __insert_orphan_inode(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 objectid, u64 size)
+{
+ struct btrfs_path *path;
+ struct btrfs_inode_item *item;
+ struct extent_buffer *leaf;
+ int ret;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ ret = btrfs_insert_empty_inode(trans, root, path, objectid);
+ if (ret)
+ goto out;
+
+ leaf = path->nodes[0];
+ item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item);
+ memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item));
+ btrfs_set_inode_generation(leaf, item, 1);
+ btrfs_set_inode_size(leaf, item, size);
+ btrfs_set_inode_mode(leaf, item, S_IFREG | 0600);
+ btrfs_set_inode_flags(leaf, item, BTRFS_INODE_NODATASUM);
+ btrfs_mark_buffer_dirty(leaf);
+ btrfs_release_path(root, path);
+out:
+ btrfs_free_path(path);
+ return ret;
+}
+
+static struct inode noinline *create_reloc_inode(struct btrfs_fs_info *fs_info,
+ struct btrfs_block_group_cache *group)
+{
+ struct inode *inode = NULL;
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *root;
+ struct btrfs_key root_key;
+ u64 objectid = BTRFS_FIRST_FREE_OBJECTID;
+ int err = 0;
+
+ root_key.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID;
+ root_key.type = BTRFS_ROOT_ITEM_KEY;
+ root_key.offset = (u64)-1;
+ root = btrfs_read_fs_root_no_name(fs_info, &root_key);
+ if (IS_ERR(root))
+ return ERR_CAST(root);
+
+ trans = btrfs_start_transaction(root, 1);
+ BUG_ON(!trans);
+
+ err = btrfs_find_free_objectid(trans, root, objectid, &objectid);
+ if (err)
+ goto out;
+
+ err = __insert_orphan_inode(trans, root, objectid, group->key.offset);
+ BUG_ON(err);
+
+ err = btrfs_insert_file_extent(trans, root, objectid, 0, 0, 0,
+ group->key.offset, 0);
+ BUG_ON(err);
+
+ inode = btrfs_iget_locked(root->fs_info->sb, objectid, root);
+ if (inode->i_state & I_NEW) {
+ BTRFS_I(inode)->root = root;
+ BTRFS_I(inode)->location.objectid = objectid;
+ BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
+ BTRFS_I(inode)->location.offset = 0;
+ btrfs_read_locked_inode(inode);
+ unlock_new_inode(inode);
+ BUG_ON(is_bad_inode(inode));
+ } else {
+ BUG_ON(1);
+ }
+
+ err = btrfs_orphan_add(trans, inode);
+out:
+ btrfs_end_transaction(trans, root);
+ if (err) {
+ if (inode)
+ iput(inode);
+ inode = ERR_PTR(err);
+ }
+ return inode;
+}
+
+int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start)
{
struct btrfs_trans_handle *trans;
- struct btrfs_root *tree_root = root->fs_info->tree_root;
struct btrfs_path *path;
+ struct btrfs_fs_info *info = root->fs_info;
+ struct extent_buffer *leaf;
+ struct inode *reloc_inode;
+ struct btrfs_block_group_cache *block_group;
+ struct btrfs_key key;
u64 cur_byte;
u64 total_found;
- u64 shrink_last_byte;
- struct btrfs_block_group_cache *shrink_block_group;
- struct btrfs_key key;
- struct btrfs_key found_key;
- struct extent_buffer *leaf;
u32 nritems;
int ret;
int progress;
+ int pass = 0;
- mutex_lock(&root->fs_info->alloc_mutex);
- shrink_block_group = btrfs_lookup_block_group(root->fs_info,
- shrink_start);
- BUG_ON(!shrink_block_group);
+ root = root->fs_info->extent_root;
- shrink_last_byte = shrink_block_group->key.objectid +
- shrink_block_group->key.offset;
+ block_group = btrfs_lookup_block_group(info, group_start);
+ BUG_ON(!block_group);
+
+ printk("btrfs relocating block group %llu flags %llu\n",
+ (unsigned long long)block_group->key.objectid,
+ (unsigned long long)block_group->flags);
- shrink_block_group->space_info->total_bytes -=
- shrink_block_group->key.offset;
path = btrfs_alloc_path();
- root = root->fs_info->extent_root;
- path->reada = 2;
+ BUG_ON(!path);
- printk("btrfs relocating block group %llu flags %llu\n",
- (unsigned long long)shrink_start,
- (unsigned long long)shrink_block_group->flags);
+ reloc_inode = create_reloc_inode(info, block_group);
+ BUG_ON(IS_ERR(reloc_inode));
- __alloc_chunk_for_shrink(root, shrink_block_group, 1);
+ mutex_lock(&root->fs_info->alloc_mutex);
-again:
+ __alloc_chunk_for_shrink(root, block_group, 1);
+ block_group->ro = 1;
+ block_group->space_info->total_bytes -= block_group->key.offset;
- shrink_block_group->ro = 1;
+ mutex_unlock(&root->fs_info->alloc_mutex);
+ btrfs_start_delalloc_inodes(info->tree_root);
+ btrfs_wait_ordered_extents(info->tree_root, 0);
+again:
total_found = 0;
progress = 0;
- key.objectid = shrink_start;
+ key.objectid = block_group->key.objectid;
key.offset = 0;
key.type = 0;
cur_byte = key.objectid;
- mutex_unlock(&root->fs_info->alloc_mutex);
+ trans = btrfs_start_transaction(info->tree_root, 1);
+ btrfs_commit_transaction(trans, info->tree_root);
- btrfs_start_delalloc_inodes(root);
- btrfs_wait_ordered_extents(tree_root, 0);
+ mutex_lock(&root->fs_info->cleaner_mutex);
+ btrfs_clean_old_snapshots(info->tree_root);
+ btrfs_remove_leaf_refs(info->tree_root, (u64)-1, 1);
+ mutex_unlock(&root->fs_info->cleaner_mutex);
mutex_lock(&root->fs_info->alloc_mutex);
- ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
- if (ret < 0)
- goto out;
-
- ret = btrfs_previous_item(root, path, 0, BTRFS_EXTENT_ITEM_KEY);
- if (ret < 0)
- goto out;
-
- if (ret == 0) {
- leaf = path->nodes[0];
- btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
- if (found_key.objectid + found_key.offset > shrink_start &&
- found_key.objectid < shrink_last_byte) {
- cur_byte = found_key.objectid;
- key.objectid = cur_byte;
- }
- }
- btrfs_release_path(root, path);
-
while(1) {
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
goto out;
-
next:
leaf = path->nodes[0];
nritems = btrfs_header_nritems(leaf);
@@ -3779,109 +4944,76 @@ next:
nritems = btrfs_header_nritems(leaf);
}
- btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+ btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
- if (found_key.objectid >= shrink_last_byte)
+ if (key.objectid >= block_group->key.objectid +
+ block_group->key.offset)
break;
if (progress && need_resched()) {
- memcpy(&key, &found_key, sizeof(key));
- cond_resched();
btrfs_release_path(root, path);
- btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ mutex_unlock(&root->fs_info->alloc_mutex);
+ cond_resched();
+ mutex_lock(&root->fs_info->alloc_mutex);
progress = 0;
- goto next;
+ continue;
}
progress = 1;
- if (btrfs_key_type(&found_key) != BTRFS_EXTENT_ITEM_KEY ||
- found_key.objectid + found_key.offset <= cur_byte) {
- memcpy(&key, &found_key, sizeof(key));
- key.offset++;
+ if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY ||
+ key.objectid + key.offset <= cur_byte) {
path->slots[0]++;
goto next;
}
total_found++;
- cur_byte = found_key.objectid + found_key.offset;
- key.objectid = cur_byte;
+ cur_byte = key.objectid + key.offset;
btrfs_release_path(root, path);
- ret = relocate_one_extent(root, path, &found_key);
- __alloc_chunk_for_shrink(root, shrink_block_group, 0);
- }
-
- btrfs_release_path(root, path);
-
- if (total_found > 0) {
- printk("btrfs relocate found %llu last extent was %llu\n",
- (unsigned long long)total_found,
- (unsigned long long)found_key.objectid);
- mutex_unlock(&root->fs_info->alloc_mutex);
- trans = btrfs_start_transaction(tree_root, 1);
- btrfs_commit_transaction(trans, tree_root);
-
- btrfs_clean_old_snapshots(tree_root);
- btrfs_start_delalloc_inodes(root);
- btrfs_wait_ordered_extents(tree_root, 0);
+ __alloc_chunk_for_shrink(root, block_group, 0);
+ ret = relocate_one_extent(root, path, &key, block_group,
+ reloc_inode, pass);
+ BUG_ON(ret < 0);
- trans = btrfs_start_transaction(tree_root, 1);
- btrfs_commit_transaction(trans, tree_root);
- mutex_lock(&root->fs_info->alloc_mutex);
- goto again;
+ key.objectid = cur_byte;
+ key.type = 0;
+ key.offset = 0;
}
- /*
- * we've freed all the extents, now remove the block
- * group item from the tree
- */
+ btrfs_release_path(root, path);
mutex_unlock(&root->fs_info->alloc_mutex);
- trans = btrfs_start_transaction(root, 1);
-
- mutex_lock(&root->fs_info->alloc_mutex);
- memcpy(&key, &shrink_block_group->key, sizeof(key));
-
- ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
- if (ret > 0)
- ret = -EIO;
- if (ret < 0) {
- btrfs_end_transaction(trans, root);
- goto out;
+ if (pass == 0) {
+ btrfs_wait_ordered_range(reloc_inode, 0, (u64)-1);
+ invalidate_mapping_pages(reloc_inode->i_mapping, 0, -1);
+ WARN_ON(reloc_inode->i_mapping->nrpages);
}
- spin_lock(&root->fs_info->block_group_cache_lock);
- rb_erase(&shrink_block_group->cache_node,
- &root->fs_info->block_group_cache_tree);
- spin_unlock(&root->fs_info->block_group_cache_lock);
-
- ret = btrfs_remove_free_space(shrink_block_group, key.objectid,
- key.offset);
- if (ret) {
- btrfs_end_transaction(trans, root);
- goto out;
+ if (total_found > 0) {
+ printk("btrfs found %llu extents in pass %d\n",
+ (unsigned long long)total_found, pass);
+ pass++;
+ goto again;
}
- /*
- memset(shrink_block_group, 0, sizeof(*shrink_block_group));
- kfree(shrink_block_group);
- */
- btrfs_del_item(trans, root, path);
- btrfs_release_path(root, path);
- mutex_unlock(&root->fs_info->alloc_mutex);
- btrfs_commit_transaction(trans, root);
+ /* delete reloc_inode */
+ iput(reloc_inode);
+
+ /* unpin extents in this range */
+ trans = btrfs_start_transaction(info->tree_root, 1);
+ btrfs_commit_transaction(trans, info->tree_root);
mutex_lock(&root->fs_info->alloc_mutex);
- /* the code to unpin extents might set a few bits in the free
- * space cache for this range again
- */
- /* XXX? */
- ret = btrfs_remove_free_space(shrink_block_group, key.objectid,
- key.offset);
+ spin_lock(&block_group->lock);
+ WARN_ON(block_group->pinned > 0);
+ WARN_ON(block_group->reserved > 0);
+ WARN_ON(btrfs_block_group_used(&block_group->item) > 0);
+ spin_unlock(&block_group->lock);
+ ret = 0;
out:
- btrfs_free_path(path);
mutex_unlock(&root->fs_info->alloc_mutex);
+ btrfs_free_path(path);
return ret;
}
@@ -3922,6 +5054,33 @@ out:
return ret;
}
+int btrfs_free_block_groups(struct btrfs_fs_info *info)
+{
+ struct btrfs_block_group_cache *block_group;
+ struct rb_node *n;
+
+ mutex_lock(&info->alloc_mutex);
+ spin_lock(&info->block_group_cache_lock);
+ while ((n = rb_last(&info->block_group_cache_tree)) != NULL) {
+ block_group = rb_entry(n, struct btrfs_block_group_cache,
+ cache_node);
+
+ spin_unlock(&info->block_group_cache_lock);
+ btrfs_remove_free_space_cache(block_group);
+ spin_lock(&info->block_group_cache_lock);
+
+ rb_erase(&block_group->cache_node,
+ &info->block_group_cache_tree);
+ spin_lock(&block_group->space_info->lock);
+ list_del(&block_group->list);
+ spin_unlock(&block_group->space_info->lock);
+ kfree(block_group);
+ }
+ spin_unlock(&info->block_group_cache_lock);
+ mutex_unlock(&info->alloc_mutex);
+ return 0;
+}
+
int btrfs_read_block_groups(struct btrfs_root *root)
{
struct btrfs_path *path;
@@ -4039,3 +5198,46 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans,
return 0;
}
+
+int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 group_start)
+{
+ struct btrfs_path *path;
+ struct btrfs_block_group_cache *block_group;
+ struct btrfs_key key;
+ int ret;
+
+ BUG_ON(!mutex_is_locked(&root->fs_info->alloc_mutex));
+ root = root->fs_info->extent_root;
+
+ block_group = btrfs_lookup_block_group(root->fs_info, group_start);
+ BUG_ON(!block_group);
+
+ memcpy(&key, &block_group->key, sizeof(key));
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+
+ btrfs_remove_free_space_cache(block_group);
+ rb_erase(&block_group->cache_node,
+ &root->fs_info->block_group_cache_tree);
+ spin_lock(&block_group->space_info->lock);
+ list_del(&block_group->list);
+ spin_unlock(&block_group->space_info->lock);
+
+ /*
+ memset(shrink_block_group, 0, sizeof(*shrink_block_group));
+ kfree(shrink_block_group);
+ */
+
+ ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
+ if (ret > 0)
+ ret = -EIO;
+ if (ret < 0)
+ goto out;
+
+ ret = btrfs_del_item(trans, root, path);
+out:
+ btrfs_free_path(path);
+ return ret;
+}
diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c
index e3984f902e7..0091c01abb0 100644
--- a/fs/btrfs/root-tree.c
+++ b/fs/btrfs/root-tree.c
@@ -210,7 +210,10 @@ again:
goto err;
}
- ret = btrfs_add_dead_root(dead_root, latest);
+ if (objectid == BTRFS_TREE_RELOC_OBJECTID)
+ ret = btrfs_add_dead_reloc_root(dead_root);
+ else
+ ret = btrfs_add_dead_root(dead_root, latest);
if (ret)
goto err;
goto again;
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 8c83cf464c8..444abe0796a 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -477,6 +477,7 @@ static noinline int add_dirty_roots(struct btrfs_trans_handle *trans,
dirty = root->dirty_root;
btrfs_free_log(trans, root);
+ btrfs_free_reloc_root(root);
if (root->commit_root == root->node) {
WARN_ON(root->node->start !=
@@ -855,6 +856,11 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
* with the tree-log code.
*/
mutex_lock(&root->fs_info->tree_log_mutex);
+ /*
+ * keep tree reloc code from adding new reloc trees
+ */
+ mutex_lock(&root->fs_info->tree_reloc_mutex);
+
ret = add_dirty_roots(trans, &root->fs_info->fs_roots_radix,
&dirty_fs_roots);
@@ -865,6 +871,8 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
*/
btrfs_free_log_root_tree(trans, root->fs_info);
+ btrfs_free_reloc_mappings(root);
+
ret = btrfs_commit_tree_roots(trans, root);
BUG_ON(ret);
@@ -910,10 +918,13 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
mutex_unlock(&root->fs_info->tree_log_mutex);
btrfs_finish_extent_commit(trans, root, pinned_copy);
- mutex_lock(&root->fs_info->trans_mutex);
-
kfree(pinned_copy);
+ btrfs_drop_dead_reloc_roots(root);
+ mutex_unlock(&root->fs_info->tree_reloc_mutex);
+
+ mutex_lock(&root->fs_info->trans_mutex);
+
cur_trans->commit_done = 1;
root->fs_info->last_trans_committed = cur_trans->transid;
wake_up(&cur_trans->commit_wait);
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index ddf89626498..51f113119b2 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1268,7 +1268,7 @@ int btrfs_relocate_chunk(struct btrfs_root *root,
em_tree = &root->fs_info->mapping_tree.map_tree;
/* step one, relocate all the extents inside this chunk */
- ret = btrfs_shrink_extent_tree(extent_root, chunk_offset);
+ ret = btrfs_relocate_block_group(extent_root, chunk_offset);
BUG_ON(ret);
trans = btrfs_start_transaction(root, 1);
@@ -1308,15 +1308,18 @@ int btrfs_relocate_chunk(struct btrfs_root *root,
BUG_ON(ret);
}
+ ret = btrfs_remove_block_group(trans, extent_root, chunk_offset);
+ BUG_ON(ret);
+
spin_lock(&em_tree->lock);
remove_extent_mapping(em_tree, em);
+ spin_unlock(&em_tree->lock);
+
kfree(map);
em->bdev = NULL;
/* once for the tree */
free_extent_map(em);
- spin_unlock(&em_tree->lock);
-
/* once for us */
free_extent_map(em);
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-19 22:36:28 +0000