Yan, Zheng
2010-Apr-26 10:45 UTC
[PATCH V2 09/12] Btrfs: Metadata reservation for orphan inodes
reserve metadata space for handling orphan inodes
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
---
diff -urp 2/fs/btrfs/btrfs_inode.h 3/fs/btrfs/btrfs_inode.h
--- 2/fs/btrfs/btrfs_inode.h 2010-04-26 17:27:52.113080051 +0800
+++ 3/fs/btrfs/btrfs_inode.h 2010-04-26 17:27:52.118079430 +0800
@@ -151,6 +151,7 @@ struct btrfs_inode {
* of these.
*/
unsigned ordered_data_close:1;
+ unsigned orphan_meta_reserved:1;
unsigned dummy_inode:1;
/*
diff -urp 2/fs/btrfs/ctree.h 3/fs/btrfs/ctree.h
--- 2/fs/btrfs/ctree.h 2010-04-26 17:27:52.114079844 +0800
+++ 3/fs/btrfs/ctree.h 2010-04-26 17:27:52.119079920 +0800
@@ -1068,7 +1068,6 @@ struct btrfs_root {
int ref_cows;
int track_dirty;
int in_radix;
- int clean_orphans;
u64 defrag_trans_start;
struct btrfs_key defrag_progress;
@@ -1082,8 +1081,11 @@ struct btrfs_root {
struct list_head root_list;
- spinlock_t list_lock;
+ spinlock_t orphan_lock;
struct list_head orphan_list;
+ struct btrfs_block_rsv *orphan_block_rsv;
+ int orphan_item_inserted;
+ int orphan_cleanup_state;
spinlock_t inode_lock;
/* red-black tree that keeps track of in-memory inodes */
@@ -2079,6 +2081,9 @@ int btrfs_trans_reserve_metadata(struct
int num_items, int *retries);
void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
+int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
+ struct inode *inode);
+void btrfs_orphan_release_metadata(struct inode *inode);
int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans,
struct btrfs_pending_snapshot *pending);
int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes);
@@ -2403,6 +2408,13 @@ int btrfs_update_inode(struct btrfs_tran
int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode);
void btrfs_orphan_cleanup(struct btrfs_root *root);
+void btrfs_orphan_pre_snapshot(struct btrfs_trans_handle *trans,
+ struct btrfs_pending_snapshot *pending,
+ u64 *bytes_to_reserve);
+void btrfs_orphan_post_snapshot(struct btrfs_trans_handle *trans,
+ struct btrfs_pending_snapshot *pending);
+void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root);
int btrfs_cont_expand(struct inode *inode, loff_t size);
int btrfs_invalidate_inodes(struct btrfs_root *root);
void btrfs_add_delayed_iput(struct inode *inode);
diff -urp 2/fs/btrfs/disk-io.c 3/fs/btrfs/disk-io.c
--- 2/fs/btrfs/disk-io.c 2010-04-26 17:27:52.105081158 +0800
+++ 3/fs/btrfs/disk-io.c 2010-04-26 17:27:52.120080690 +0800
@@ -895,7 +895,8 @@ static int __setup_root(u32 nodesize, u3
root->ref_cows = 0;
root->track_dirty = 0;
root->in_radix = 0;
- root->clean_orphans = 0;
+ root->orphan_item_inserted = 0;
+ root->orphan_cleanup_state = 0;
root->fs_info = fs_info;
root->objectid = objectid;
@@ -905,12 +906,13 @@ static int __setup_root(u32 nodesize, u3
root->in_sysfs = 0;
root->inode_tree = RB_ROOT;
root->block_rsv = NULL;
+ root->orphan_block_rsv = NULL;
INIT_LIST_HEAD(&root->dirty_list);
INIT_LIST_HEAD(&root->orphan_list);
INIT_LIST_HEAD(&root->root_list);
spin_lock_init(&root->node_lock);
- spin_lock_init(&root->list_lock);
+ spin_lock_init(&root->orphan_lock);
spin_lock_init(&root->inode_lock);
spin_lock_init(&root->accounting_lock);
mutex_init(&root->objectid_mutex);
@@ -1194,19 +1196,23 @@ again:
if (root)
return root;
- ret = btrfs_find_orphan_item(fs_info->tree_root, location->objectid);
- if (ret == 0)
- ret = -ENOENT;
- if (ret < 0)
- return ERR_PTR(ret);
-
root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location);
if (IS_ERR(root))
return root;
- WARN_ON(btrfs_root_refs(&root->root_item) == 0);
set_anon_super(&root->anon_super, NULL);
+ if (btrfs_root_refs(&root->root_item) == 0) {
+ ret = -ENOENT;
+ goto fail;
+ }
+
+ ret = btrfs_find_orphan_item(fs_info->tree_root, location->objectid);
+ if (ret < 0)
+ goto fail;
+ if (ret == 0)
+ root->orphan_item_inserted = 1;
+
ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM);
if (ret)
goto fail;
@@ -1215,10 +1221,9 @@ again:
ret = radix_tree_insert(&fs_info->fs_roots_radix,
(unsigned long)root->root_key.objectid,
root);
- if (ret == 0) {
+ if (ret == 0)
root->in_radix = 1;
- root->clean_orphans = 1;
- }
+
spin_unlock(&fs_info->fs_roots_radix_lock);
radix_tree_preload_end();
if (ret) {
@@ -1989,6 +1994,9 @@ struct btrfs_root *open_ctree(struct sup
BUG_ON(ret);
if (!(sb->s_flags & MS_RDONLY)) {
+ ret = btrfs_cleanup_fs_roots(fs_info);
+ BUG_ON(ret);
+
ret = btrfs_recover_relocation(tree_root);
if (ret < 0) {
printk(KERN_WARNING
diff -urp 2/fs/btrfs/extent-tree.c 3/fs/btrfs/extent-tree.c
--- 2/fs/btrfs/extent-tree.c 2010-04-26 17:27:52.115079356 +0800
+++ 3/fs/btrfs/extent-tree.c 2010-04-26 17:27:52.122094940 +0800
@@ -3625,6 +3625,34 @@ void btrfs_trans_release_metadata(struct
trans->bytes_reserved = 0;
}
+int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
+ struct inode *inode)
+{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root);
+ struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv;
+
+ /*
+ * one for deleting orphan item, one for updating inode and
+ * two for calling btrfs_truncate_inode_items.
+ *
+ * btrfs_truncate_inode_items is a delete operation, it frees
+ * more space than it uses in most cases. So two units of
+ * metadata space should be enough for calling it many times.
+ * If all of the metadata space is used, we can commit
+ * transaction and use space it freed.
+ */
+ u64 num_bytes = calc_trans_metadata_size(root, 4);
+ return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes);
+}
+
+void btrfs_orphan_release_metadata(struct inode *inode)
+{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ u64 num_bytes = calc_trans_metadata_size(root, 4);
+ btrfs_block_rsv_release(root, root->orphan_block_rsv, num_bytes);
+}
+
int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans,
struct btrfs_pending_snapshot *pending)
{
diff -urp 2/fs/btrfs/inode.c 3/fs/btrfs/inode.c
--- 2/fs/btrfs/inode.c 2010-04-26 17:27:52.108089893 +0800
+++ 3/fs/btrfs/inode.c 2010-04-26 17:27:52.124089496 +0800
@@ -1981,32 +1981,196 @@ void btrfs_run_delayed_iputs(struct btrf
}
/*
+ * calculate extra metadata reservation when snapshotting a subvolume
+ * contains orphan files.
+ */
+void btrfs_orphan_pre_snapshot(struct btrfs_trans_handle *trans,
+ struct btrfs_pending_snapshot *pending,
+ u64 *bytes_to_reserve)
+{
+ struct btrfs_root *root;
+ struct btrfs_block_rsv *block_rsv;
+ u64 num_bytes;
+ int index;
+
+ root = pending->root;
+ if (!root->orphan_block_rsv || list_empty(&root->orphan_list))
+ return;
+
+ block_rsv = root->orphan_block_rsv;
+
+ /* orphan block reservation for the snapshot */
+ num_bytes = block_rsv->size;
+
+ /*
+ * after the snapshot is created, COWing tree blocks may use more
+ * space than it frees. So we should make sure there is enough
+ * reserved space.
+ */
+ index = trans->transid & 0x1;
+ if (block_rsv->reserved + block_rsv->freed[index] <
block_rsv->size) {
+ num_bytes += block_rsv->size -
+ (block_rsv->reserved + block_rsv->freed[index]);
+ }
+
+ *bytes_to_reserve += num_bytes;
+}
+
+void btrfs_orphan_post_snapshot(struct btrfs_trans_handle *trans,
+ struct btrfs_pending_snapshot *pending)
+{
+ struct btrfs_root *root = pending->root;
+ struct btrfs_root *snap = pending->snap;
+ struct btrfs_block_rsv *block_rsv;
+ u64 num_bytes;
+ int index;
+ int ret;
+
+ if (!root->orphan_block_rsv || list_empty(&root->orphan_list))
+ return;
+
+ /* refill source subvolume''s orphan block reservation */
+ block_rsv = root->orphan_block_rsv;
+ index = trans->transid & 0x1;
+ if (block_rsv->reserved + block_rsv->freed[index] <
block_rsv->size) {
+ num_bytes = block_rsv->size -
+ (block_rsv->reserved + block_rsv->freed[index]);
+ ret = btrfs_block_rsv_migrate(&pending->block_rsv,
+ root->orphan_block_rsv,
+ num_bytes);
+ BUG_ON(ret);
+ }
+
+ /* setup orphan block reservation for the snapshot */
+ block_rsv = btrfs_alloc_block_rsv(snap);
+ BUG_ON(!block_rsv);
+
+ btrfs_add_durable_block_rsv(root->fs_info, block_rsv);
+ snap->orphan_block_rsv = block_rsv;
+
+ num_bytes = root->orphan_block_rsv->size;
+ ret = btrfs_block_rsv_migrate(&pending->block_rsv,
+ block_rsv, num_bytes);
+ BUG_ON(ret);
+
+#if 0
+ /* insert orphan item for the snapshot */
+ WARN_ON(!root->orphan_item_inserted);
+ ret = btrfs_insert_orphan_item(trans, root->fs_info->tree_root,
+ snap->root_key.objectid);
+ BUG_ON(ret);
+ snap->orphan_item_inserted = 1;
+#endif
+}
+
+enum btrfs_orphan_cleanup_state {
+ ORPHAN_CLEANUP_STARTED = 1,
+ ORPHAN_CLEANUP_DONE = 2,
+};
+
+/*
+ * This is called in transaction commmit time. If there are no orphan
+ * files in the subvolume, it removes orphan item and frees block_rsv
+ * structure.
+ */
+void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root)
+{
+ int ret;
+
+ if (!list_empty(&root->orphan_list) ||
+ root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE)
+ return;
+
+ if (root->orphan_item_inserted &&
+ btrfs_root_refs(&root->root_item) > 0) {
+ ret = btrfs_del_orphan_item(trans, root->fs_info->tree_root,
+ root->root_key.objectid);
+ BUG_ON(ret);
+ root->orphan_item_inserted = 0;
+ }
+
+ if (root->orphan_block_rsv) {
+ WARN_ON(root->orphan_block_rsv->size > 0);
+ btrfs_free_block_rsv(root, root->orphan_block_rsv);
+ root->orphan_block_rsv = NULL;
+ }
+}
+
+/*
* This creates an orphan entry for the given inode in case something goes
* wrong in the middle of an unlink/truncate.
+ *
+ * NOTE: caller of this function should reserve 5 units of metadata for
+ * this function.
*/
int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
- int ret = 0;
+ struct btrfs_block_rsv *block_rsv = NULL;
+ int reserve = 0;
+ int insert = 0;
+ int ret;
- spin_lock(&root->list_lock);
+ if (!root->orphan_block_rsv) {
+ block_rsv = btrfs_alloc_block_rsv(root);
+ BUG_ON(!block_rsv);
+ }
- /* already on the orphan list, we''re good */
- if (!list_empty(&BTRFS_I(inode)->i_orphan)) {
- spin_unlock(&root->list_lock);
- return 0;
+ spin_lock(&root->orphan_lock);
+ if (!root->orphan_block_rsv) {
+ root->orphan_block_rsv = block_rsv;
+ } else if (block_rsv) {
+ btrfs_free_block_rsv(root, block_rsv);
+ block_rsv = NULL;
}
- list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list);
+ if (list_empty(&BTRFS_I(inode)->i_orphan)) {
+ list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list);
+#if 0
+ /*
+ * For proper ENOSPC handling, we should do orphan
+ * cleanup when mounting. But this introduces backward
+ * compatibility issue.
+ */
+ if (!xchg(&root->orphan_item_inserted, 1))
+ insert = 2;
+ else
+ insert = 1;
+#endif
+ insert = 1;
+ } else {
+ WARN_ON(!BTRFS_I(inode)->orphan_meta_reserved);
+ }
- spin_unlock(&root->list_lock);
+ if (!BTRFS_I(inode)->orphan_meta_reserved) {
+ BTRFS_I(inode)->orphan_meta_reserved = 1;
+ reserve = 1;
+ }
+ spin_unlock(&root->orphan_lock);
- /*
- * insert an orphan item to track this unlinked/truncated file
- */
- ret = btrfs_insert_orphan_item(trans, root, inode->i_ino);
+ if (block_rsv)
+ btrfs_add_durable_block_rsv(root->fs_info, block_rsv);
- return ret;
+ /* grab metadata reservation from transaction handle */
+ if (reserve) {
+ ret = btrfs_orphan_reserve_metadata(trans, inode);
+ BUG_ON(ret);
+ }
+
+ /* insert an orphan item to track this unlinked/truncated file */
+ if (insert >= 1) {
+ ret = btrfs_insert_orphan_item(trans, root, inode->i_ino);
+ BUG_ON(ret);
+ }
+
+ /* insert an orphan item to track subvolume contains orphan files */
+ if (insert >= 2) {
+ ret = btrfs_insert_orphan_item(trans, root->fs_info->tree_root,
+ root->root_key.objectid);
+ BUG_ON(ret);
+ }
+ return 0;
}
/*
@@ -2016,26 +2180,31 @@ int btrfs_orphan_add(struct btrfs_trans_
int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
+ int delete_item = 0;
+ int release_rsv = 0;
int ret = 0;
- spin_lock(&root->list_lock);
-
- if (list_empty(&BTRFS_I(inode)->i_orphan)) {
- spin_unlock(&root->list_lock);
- return 0;
+ spin_lock(&root->orphan_lock);
+ if (!list_empty(&BTRFS_I(inode)->i_orphan)) {
+ list_del_init(&BTRFS_I(inode)->i_orphan);
+ delete_item = 1;
}
- list_del_init(&BTRFS_I(inode)->i_orphan);
- if (!trans) {
- spin_unlock(&root->list_lock);
- return 0;
+ if (BTRFS_I(inode)->orphan_meta_reserved) {
+ BTRFS_I(inode)->orphan_meta_reserved = 0;
+ release_rsv = 1;
}
+ spin_unlock(&root->orphan_lock);
- spin_unlock(&root->list_lock);
+ if (trans && delete_item) {
+ ret = btrfs_del_orphan_item(trans, root, inode->i_ino);
+ BUG_ON(ret);
+ }
- ret = btrfs_del_orphan_item(trans, root, inode->i_ino);
+ if (release_rsv)
+ btrfs_orphan_release_metadata(inode);
- return ret;
+ return 0;
}
/*
@@ -2052,7 +2221,7 @@ void btrfs_orphan_cleanup(struct btrfs_r
struct inode *inode;
int ret = 0, nr_unlink = 0, nr_truncate = 0;
- if (!xchg(&root->clean_orphans, 0))
+ if (cmpxchg(&root->orphan_cleanup_state, 0, ORPHAN_CLEANUP_STARTED))
return;
path = btrfs_alloc_path();
@@ -2105,16 +2274,15 @@ void btrfs_orphan_cleanup(struct btrfs_r
found_key.type = BTRFS_INODE_ITEM_KEY;
found_key.offset = 0;
inode = btrfs_iget(root->fs_info->sb, &found_key, root, NULL);
- if (IS_ERR(inode))
- break;
+ BUG_ON(IS_ERR(inode));
/*
* add this inode to the orphan list so btrfs_orphan_del does
* the proper thing when we hit it
*/
- spin_lock(&root->list_lock);
+ spin_lock(&root->orphan_lock);
list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list);
- spin_unlock(&root->list_lock);
+ spin_unlock(&root->orphan_lock);
/*
* if this is a bad inode, means we actually succeeded in
@@ -2141,13 +2309,23 @@ void btrfs_orphan_cleanup(struct btrfs_r
/* this will do delete_inode and everything for us */
iput(inode);
}
+ btrfs_free_path(path);
+
+ root->orphan_cleanup_state = ORPHAN_CLEANUP_DONE;
+
+ if (root->orphan_block_rsv)
+ btrfs_block_rsv_release(root, root->orphan_block_rsv,
+ (u64)-1);
+
+ if (root->orphan_block_rsv || root->orphan_item_inserted) {
+ trans = btrfs_join_transaction(root, 1);
+ btrfs_end_transaction(trans, root);
+ }
if (nr_unlink)
printk(KERN_INFO "btrfs: unlinked %d orphans\n", nr_unlink);
if (nr_truncate)
printk(KERN_INFO "btrfs: truncated %d orphans\n", nr_truncate);
-
- btrfs_free_path(path);
}
/*
@@ -3180,6 +3358,7 @@ out:
if (pending_del_nr) {
ret = btrfs_del_items(trans, root, path, pending_del_slot,
pending_del_nr);
+ BUG_ON(ret);
}
btrfs_free_path(path);
return err;
@@ -3385,7 +3564,10 @@ static int btrfs_setattr_size(struct ino
}
}
- trans = btrfs_start_transaction(root, 1);
+ trans = btrfs_start_transaction(root, 5);
+ if (IS_ERR(trans))
+ return PTR_ERR(trans);
+
btrfs_set_trans_block_group(trans, inode);
ret = btrfs_orphan_add(trans, inode);
@@ -3405,8 +3587,11 @@ static int btrfs_setattr_size(struct ino
i_size_write(inode, attr->ia_size);
btrfs_ordered_update_i_size(inode, inode->i_size, NULL);
- trans = btrfs_start_transaction(root, 1);
+ trans = btrfs_start_transaction(root, 0);
+ BUG_ON(IS_ERR(trans));
btrfs_set_trans_block_group(trans, inode);
+ trans->block_rsv = root->orphan_block_rsv;
+ BUG_ON(!trans->block_rsv);
ret = btrfs_update_inode(trans, root, inode);
BUG_ON(ret);
@@ -3486,10 +3671,21 @@ void btrfs_delete_inode(struct inode *in
btrfs_i_size_write(inode, 0);
while (1) {
- trans = btrfs_start_transaction(root, 1);
+ trans = btrfs_start_transaction(root, 0);
+ BUG_ON(IS_ERR(trans));
btrfs_set_trans_block_group(trans, inode);
- ret = btrfs_truncate_inode_items(trans, root, inode, 0, 0);
+ trans->block_rsv = root->orphan_block_rsv;
+
+ ret = btrfs_block_rsv_check(trans, root,
+ root->orphan_block_rsv, 0, 5);
+ if (ret) {
+ BUG_ON(ret != -EAGAIN);
+ ret = btrfs_commit_transaction(trans, root);
+ BUG_ON(ret);
+ continue;
+ }
+ ret = btrfs_truncate_inode_items(trans, root, inode, 0, 0);
if (ret != -EAGAIN)
break;
@@ -3497,6 +3693,7 @@ void btrfs_delete_inode(struct inode *in
btrfs_end_transaction(trans, root);
trans = NULL;
btrfs_btree_balance_dirty(root, nr);
+
}
if (ret == 0) {
@@ -5246,8 +5443,10 @@ static void btrfs_truncate(struct inode
btrfs_wait_ordered_range(inode, inode->i_size & (~mask), (u64)-1);
btrfs_ordered_update_i_size(inode, inode->i_size, NULL);
- trans = btrfs_start_transaction(root, 1);
+ trans = btrfs_start_transaction(root, 0);
+ BUG_ON(IS_ERR(trans));
btrfs_set_trans_block_group(trans, inode);
+ trans->block_rsv = root->orphan_block_rsv;
/*
* setattr is responsible for setting the ordered_data_close flag,
@@ -5270,6 +5469,23 @@ static void btrfs_truncate(struct inode
btrfs_add_ordered_operation(trans, root, inode);
while (1) {
+ if (!trans) {
+ trans = btrfs_start_transaction(root, 0);
+ BUG_ON(IS_ERR(trans));
+ btrfs_set_trans_block_group(trans, inode);
+ trans->block_rsv = root->orphan_block_rsv;
+ }
+
+ ret = btrfs_block_rsv_check(trans, root,
+ root->orphan_block_rsv, 0, 5);
+ if (ret) {
+ BUG_ON(ret != -EAGAIN);
+ ret = btrfs_commit_transaction(trans, root);
+ BUG_ON(ret);
+ trans = NULL;
+ continue;
+ }
+
ret = btrfs_truncate_inode_items(trans, root, inode,
inode->i_size,
BTRFS_EXTENT_DATA_KEY);
@@ -5281,10 +5497,8 @@ static void btrfs_truncate(struct inode
nr = trans->blocks_used;
btrfs_end_transaction(trans, root);
+ trans = NULL;
btrfs_btree_balance_dirty(root, nr);
-
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, inode);
}
if (ret == 0 && inode->i_nlink > 0) {
@@ -5370,6 +5584,7 @@ struct inode *btrfs_alloc_inode(struct s
ei->reserved_extents = 0;
ei->ordered_data_close = 0;
+ ei->orphan_meta_reserved = 0;
ei->dummy_inode = 0;
ei->force_compress = 0;
@@ -5416,13 +5631,13 @@ void btrfs_destroy_inode(struct inode *i
spin_unlock(&root->fs_info->ordered_extent_lock);
}
- spin_lock(&root->list_lock);
+ spin_lock(&root->orphan_lock);
if (!list_empty(&BTRFS_I(inode)->i_orphan)) {
printk(KERN_INFO "BTRFS: inode %lu still on the orphan list\n",
inode->i_ino);
list_del_init(&BTRFS_I(inode)->i_orphan);
}
- spin_unlock(&root->list_lock);
+ spin_unlock(&root->orphan_lock);
while (1) {
ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1);
diff -urp 2/fs/btrfs/ioctl.c 3/fs/btrfs/ioctl.c
--- 2/fs/btrfs/ioctl.c 2010-04-26 17:27:52.104080598 +0800
+++ 3/fs/btrfs/ioctl.c 2010-04-26 17:27:52.125100043 +0800
@@ -1296,10 +1296,12 @@ static noinline int btrfs_ioctl_snap_des
dest->root_item.drop_level = 0;
btrfs_set_root_refs(&dest->root_item, 0);
- ret = btrfs_insert_orphan_item(trans,
- root->fs_info->tree_root,
- dest->root_key.objectid);
- BUG_ON(ret);
+ if (!xchg(&dest->orphan_item_inserted, 1)) {
+ ret = btrfs_insert_orphan_item(trans,
+ root->fs_info->tree_root,
+ dest->root_key.objectid);
+ BUG_ON(ret);
+ }
ret = btrfs_commit_transaction(trans, root);
BUG_ON(ret);
diff -urp 2/fs/btrfs/root-tree.c 3/fs/btrfs/root-tree.c
--- 2/fs/btrfs/root-tree.c 2010-04-26 17:27:52.108089893 +0800
+++ 3/fs/btrfs/root-tree.c 2010-04-26 17:27:52.126110591 +0800
@@ -259,6 +259,8 @@ int btrfs_find_orphan_roots(struct btrfs
struct extent_buffer *leaf;
struct btrfs_path *path;
struct btrfs_key key;
+ struct btrfs_key root_key;
+ struct btrfs_root *root;
int err = 0;
int ret;
@@ -270,6 +272,9 @@ int btrfs_find_orphan_roots(struct btrfs
key.type = BTRFS_ORPHAN_ITEM_KEY;
key.offset = 0;
+ root_key.type = BTRFS_ROOT_ITEM_KEY;
+ root_key.offset = (u64)-1;
+
while (1) {
ret = btrfs_search_slot(NULL, tree_root, &key, path, 0, 0);
if (ret < 0) {
@@ -294,13 +299,25 @@ int btrfs_find_orphan_roots(struct btrfs
key.type != BTRFS_ORPHAN_ITEM_KEY)
break;
- ret = btrfs_find_dead_roots(tree_root, key.offset);
- if (ret) {
+ root_key.objectid = key.offset;
+ key.offset++;
+
+ root = btrfs_read_fs_root_no_name(tree_root->fs_info,
+ &root_key);
+ if (!IS_ERR(root))
+ continue;
+
+ ret = PTR_ERR(root);
+ if (ret != -ENOENT) {
err = ret;
break;
}
- key.offset++;
+ ret = btrfs_find_dead_roots(tree_root, root_key.objectid);
+ if (ret) {
+ err = ret;
+ break;
+ }
}
btrfs_free_path(path);
diff -urp 2/fs/btrfs/super.c 3/fs/btrfs/super.c
--- 2/fs/btrfs/super.c 2010-04-26 17:27:52.113080051 +0800
+++ 3/fs/btrfs/super.c 2010-04-26 17:27:52.127095576 +0800
@@ -693,11 +693,11 @@ static int btrfs_remount(struct super_bl
if (btrfs_super_log_root(&root->fs_info->super_copy) != 0)
return -EINVAL;
- /* recover relocation */
- ret = btrfs_recover_relocation(root);
+ ret = btrfs_cleanup_fs_roots(root->fs_info);
WARN_ON(ret);
- ret = btrfs_cleanup_fs_roots(root->fs_info);
+ /* recover relocation */
+ ret = btrfs_recover_relocation(root);
WARN_ON(ret);
sb->s_flags &= ~MS_RDONLY;
diff -urp 2/fs/btrfs/transaction.c 3/fs/btrfs/transaction.c
--- 2/fs/btrfs/transaction.c 2010-04-26 17:27:52.104080598 +0800
+++ 3/fs/btrfs/transaction.c 2010-04-26 17:27:52.128080142 +0800
@@ -675,6 +675,7 @@ static noinline int commit_fs_roots(stru
btrfs_free_log(trans, root);
btrfs_update_reloc_root(trans, root);
+ btrfs_orphan_commit_root(trans, root);
if (root->commit_root != root->node) {
switch_commit_root(root);
@@ -834,6 +835,8 @@ static noinline int create_pending_snaps
struct extent_buffer *tmp;
struct extent_buffer *old;
int ret;
+ int retries = 0;
+ u64 to_reserve = 0;
u64 index = 0;
u64 objectid;
@@ -849,6 +852,17 @@ static noinline int create_pending_snaps
goto fail;
}
+ btrfs_orphan_pre_snapshot(trans, pending, &to_reserve);
+
+ if (to_reserve > 0) {
+ ret = btrfs_block_rsv_add(trans, root, &pending->block_rsv,
+ to_reserve, &retries);
+ if (ret) {
+ pending->error = ret;
+ goto fail;
+ }
+ }
+
key.objectid = objectid;
key.offset = (u64)-1;
key.type = BTRFS_ROOT_ITEM_KEY;
@@ -908,6 +922,8 @@ static noinline int create_pending_snaps
key.offset = (u64)-1;
pending->snap = btrfs_read_fs_root_no_name(root->fs_info, &key);
BUG_ON(IS_ERR(pending->snap));
+
+ btrfs_orphan_post_snapshot(trans, pending);
fail:
kfree(new_root_item);
btrfs_block_rsv_release(root, &pending->block_rsv, (u64)-1);
--
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