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-rw-r--r--fs/btrfs/Makefile2
-rw-r--r--fs/btrfs/btrfs_inode.h3
-rw-r--r--fs/btrfs/ctree.c2
-rw-r--r--fs/btrfs/ctree.h14
-rw-r--r--fs/btrfs/disk-io.c2
-rw-r--r--fs/btrfs/inode.c237
-rw-r--r--fs/btrfs/orphan.c67
7 files changed, 322 insertions, 5 deletions
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index f8a38b0..5a0fd7b 100644
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -6,7 +6,7 @@ btrfs-y := super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \
hash.o file-item.o inode-item.o inode-map.o disk-io.o \
transaction.o bit-radix.o inode.o file.o tree-defrag.o \
extent_map.o sysfs.o struct-funcs.o xattr.o ordered-data.o \
- extent_io.o volumes.o async-thread.o ioctl.o locking.o
+ extent_io.o volumes.o async-thread.o ioctl.o locking.o orphan.o
btrfs-$(CONFIG_FS_POSIX_ACL) += acl.o
else
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index 9f2a4ef..df624fd 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -39,6 +39,9 @@ struct btrfs_inode {
struct posix_acl *i_acl;
struct posix_acl *i_default_acl;
+ /* for keeping track of orphaned inodes */
+ struct list_head i_orphan;
+
/*
* transid of the trans_handle that last modified this inode
*/
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index cdc7130..f2a9499 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -2622,7 +2622,7 @@ int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
total_data += data_size[i];
}
- total_size = total_data + (nr - 1) * sizeof(struct btrfs_item);
+ total_size = total_data + (nr * sizeof(struct btrfs_item));
ret = btrfs_search_slot(trans, root, cpu_key, path, total_size, 1);
if (ret == 0) {
return -EEXIST;
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index f87d726..012ad52 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -74,6 +74,9 @@ struct btrfs_ordered_sum;
/* directory objectid inside the root tree */
#define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
+/* orhpan objectid for tracking unlinked/truncated files */
+#define BTRFS_ORPHAN_OBJECTID -5ULL
+
/*
* All files have objectids higher than this.
*/
@@ -646,6 +649,9 @@ struct btrfs_root {
/* the dirty list is only used by non-reference counted roots */
struct list_head dirty_list;
+
+ spinlock_t orphan_lock;
+ struct list_head orphan_list;
};
/*
@@ -657,6 +663,7 @@ struct btrfs_root {
#define BTRFS_INODE_ITEM_KEY 1
#define BTRFS_INODE_REF_KEY 2
#define BTRFS_XATTR_ITEM_KEY 8
+#define BTRFS_ORPHAN_ITEM_KEY 9
/* reserve 2-15 close to the inode for later flexibility */
/*
@@ -1560,6 +1567,13 @@ struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
struct btrfs_path *path, u64 dir,
const char *name, u16 name_len,
int mod);
+
+/* orphan.c */
+int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 offset);
+int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 offset);
+
/* inode-map.c */
int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
struct btrfs_root *fs_root,
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index ec01062..d609239 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -732,7 +732,9 @@ static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
root->in_sysfs = 0;
INIT_LIST_HEAD(&root->dirty_list);
+ INIT_LIST_HEAD(&root->orphan_list);
spin_lock_init(&root->node_lock);
+ spin_lock_init(&root->orphan_lock);
mutex_init(&root->objectid_mutex);
memset(&root->root_key, 0, sizeof(root->root_key));
memset(&root->root_item, 0, sizeof(root->root_item));
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 2d885354..0c9ec8a 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -78,6 +78,8 @@ static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
[S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
};
+static void btrfs_truncate(struct inode *inode);
+
int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
int for_del)
{
@@ -826,6 +828,190 @@ zeroit:
return -EIO;
}
+/*
+ * This creates an orphan entry for the given inode in case something goes
+ * wrong in the middle of an unlink/truncate.
+ */
+int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode)
+{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ int ret = 0;
+
+ spin_lock(&root->orphan_lock);
+
+ /* already on the orphan list, we're good */
+ if (!list_empty(&BTRFS_I(inode)->i_orphan)) {
+ spin_unlock(&root->orphan_lock);
+ return 0;
+ }
+
+ list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list);
+
+ 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);
+
+ return ret;
+}
+
+/*
+ * We have done the truncate/delete so we can go ahead and remove the orphan
+ * item for this particular inode.
+ */
+int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode)
+{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ int ret = 0;
+
+ spin_lock(&root->orphan_lock);
+
+ if (list_empty(&BTRFS_I(inode)->i_orphan)) {
+ spin_unlock(&root->orphan_lock);
+ return 0;
+ }
+
+ list_del_init(&BTRFS_I(inode)->i_orphan);
+ if (!trans) {
+ spin_unlock(&root->orphan_lock);
+ return 0;
+ }
+
+ spin_unlock(&root->orphan_lock);
+
+ ret = btrfs_del_orphan_item(trans, root, inode->i_ino);
+
+ return ret;
+}
+
+/*
+ * this cleans up any orphans that may be left on the list from the last use
+ * of this root.
+ */
+void btrfs_orphan_cleanup(struct btrfs_root *root)
+{
+ struct btrfs_path *path;
+ struct extent_buffer *leaf;
+ struct btrfs_item *item;
+ struct btrfs_key key, found_key;
+ struct btrfs_trans_handle *trans;
+ struct inode *inode;
+ int ret = 0, nr_unlink = 0, nr_truncate = 0;
+
+ /* don't do orphan cleanup if the fs is readonly. */
+ if (root->inode->i_sb->s_flags & MS_RDONLY)
+ return;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return;
+ path->reada = -1;
+
+ key.objectid = BTRFS_ORPHAN_OBJECTID;
+ btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY);
+ key.offset = (u64)-1;
+
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, root->inode);
+
+ while (1) {
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ if (ret < 0) {
+ printk(KERN_ERR "Error searching slot for orphan: %d"
+ "\n", ret);
+ break;
+ }
+
+ /*
+ * if ret == 0 means we found what we were searching for, which
+ * is weird, but possible, so only screw with path if we didnt
+ * find the key and see if we have stuff that matches
+ */
+ if (ret > 0) {
+ if (path->slots[0] == 0)
+ break;
+ path->slots[0]--;
+ }
+
+ /* pull out the item */
+ leaf = path->nodes[0];
+ item = btrfs_item_nr(leaf, path->slots[0]);
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+
+ /* make sure the item matches what we want */
+ if (found_key.objectid != BTRFS_ORPHAN_OBJECTID)
+ break;
+ if (btrfs_key_type(&found_key) != BTRFS_ORPHAN_ITEM_KEY)
+ break;
+
+ /* release the path since we're done with it */
+ btrfs_release_path(root, path);
+
+ /*
+ * this is where we are basically btrfs_lookup, without the
+ * crossing root thing. we store the inode number in the
+ * offset of the orphan item.
+ */
+ inode = btrfs_iget_locked(root->inode->i_sb,
+ found_key.offset, root);
+ if (!inode)
+ break;
+
+ if (inode->i_state & I_NEW) {
+ BTRFS_I(inode)->root = root;
+
+ /* have to set the location manually */
+ BTRFS_I(inode)->location.objectid = inode->i_ino;
+ BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
+ BTRFS_I(inode)->location.offset = 0;
+
+ btrfs_read_locked_inode(inode);
+ unlock_new_inode(inode);
+ }
+
+ /*
+ * add this inode to the orphan list so btrfs_orphan_del does
+ * the proper thing when we hit it
+ */
+ spin_lock(&root->orphan_lock);
+ list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list);
+ spin_unlock(&root->orphan_lock);
+
+ /*
+ * if this is a bad inode, means we actually succeeded in
+ * removing the inode, but not the orphan record, which means
+ * we need to manually delete the orphan since iput will just
+ * do a destroy_inode
+ */
+ if (is_bad_inode(inode)) {
+ btrfs_orphan_del(trans, inode);
+ iput(inode);
+ continue;
+ }
+
+ /* if we have links, this was a truncate, lets do that */
+ if (inode->i_nlink) {
+ nr_truncate++;
+ btrfs_truncate(inode);
+ } else {
+ nr_unlink++;
+ }
+
+ /* this will do delete_inode and everything for us */
+ iput(inode);
+ }
+
+ 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);
+ btrfs_end_transaction(trans, root);
+}
+
void btrfs_read_locked_inode(struct inode *inode)
{
struct btrfs_path *path;
@@ -1067,6 +1253,7 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
{
struct btrfs_root *root;
struct btrfs_trans_handle *trans;
+ struct inode *inode = dentry->d_inode;
int ret;
unsigned long nr = 0;
@@ -1080,6 +1267,10 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
btrfs_set_trans_block_group(trans, dir);
ret = btrfs_unlink_trans(trans, root, dir, dentry);
+
+ if (inode->i_nlink == 0)
+ ret = btrfs_orphan_add(trans, inode);
+
nr = trans->blocks_used;
btrfs_end_transaction_throttle(trans, root);
@@ -1108,12 +1299,17 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
trans = btrfs_start_transaction(root, 1);
btrfs_set_trans_block_group(trans, dir);
+ err = btrfs_orphan_add(trans, inode);
+ if (err)
+ goto fail_trans;
+
/* now the directory is empty */
err = btrfs_unlink_trans(trans, root, dir, dentry);
if (!err) {
btrfs_i_size_write(inode, 0);
}
+fail_trans:
nr = trans->blocks_used;
ret = btrfs_end_transaction_throttle(trans, root);
fail:
@@ -1131,6 +1327,9 @@ fail:
*
* csum items that cross the new i_size are truncated to the new size
* as well.
+ *
+ * min_type is the minimum key type to truncate down to. If set to 0, this
+ * will kill all the items on this inode, including the INODE_ITEM_KEY.
*/
static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
@@ -1495,6 +1694,7 @@ void btrfs_delete_inode(struct inode *inode)
truncate_inode_pages(&inode->i_data, 0);
if (is_bad_inode(inode)) {
+ btrfs_orphan_del(NULL, inode);
goto no_delete;
}
btrfs_wait_ordered_range(inode, 0, (u64)-1);
@@ -1504,8 +1704,12 @@ void btrfs_delete_inode(struct inode *inode)
btrfs_set_trans_block_group(trans, inode);
ret = btrfs_truncate_in_trans(trans, root, inode, 0);
- if (ret)
+ if (ret) {
+ btrfs_orphan_del(NULL, inode);
goto no_delete_lock;
+ }
+
+ btrfs_orphan_del(trans, inode);
nr = trans->blocks_used;
clear_inode(inode);
@@ -1688,7 +1892,7 @@ static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
struct btrfs_root *root = bi->root;
struct btrfs_root *sub_root = root;
struct btrfs_key location;
- int ret;
+ int ret, do_orphan = 0;
if (dentry->d_name.len > BTRFS_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
@@ -1706,6 +1910,7 @@ static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
return ERR_PTR(ret);
if (ret > 0)
return ERR_PTR(-ENOENT);
+
inode = btrfs_iget_locked(dir->i_sb, location.objectid,
sub_root);
if (!inode)
@@ -1715,6 +1920,7 @@ static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
if (sub_root != root) {
igrab(inode);
sub_root->inode = inode;
+ do_orphan = 1;
}
BTRFS_I(inode)->root = sub_root;
memcpy(&BTRFS_I(inode)->location, &location,
@@ -1723,6 +1929,10 @@ static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
unlock_new_inode(inode);
}
}
+
+ if (unlikely(do_orphan))
+ btrfs_orphan_cleanup(sub_root);
+
return d_splice_alias(inode, dentry);
}
@@ -2964,12 +3174,19 @@ static void btrfs_truncate(struct inode *inode)
btrfs_set_trans_block_group(trans, inode);
btrfs_i_size_write(inode, inode->i_size);
+ ret = btrfs_orphan_add(trans, inode);
+ if (ret)
+ goto out;
/* FIXME, add redo link to tree so we don't leak on crash */
ret = btrfs_truncate_in_trans(trans, root, inode,
BTRFS_EXTENT_DATA_KEY);
btrfs_update_inode(trans, root, inode);
- nr = trans->blocks_used;
+ ret = btrfs_orphan_del(trans, inode);
+ BUG_ON(ret);
+
+out:
+ nr = trans->blocks_used;
ret = btrfs_end_transaction_throttle(trans, root);
BUG_ON(ret);
btrfs_btree_balance_dirty(root, nr);
@@ -3046,6 +3263,7 @@ struct inode *btrfs_alloc_inode(struct super_block *sb)
btrfs_ordered_inode_tree_init(&ei->ordered_tree);
ei->i_acl = BTRFS_ACL_NOT_CACHED;
ei->i_default_acl = BTRFS_ACL_NOT_CACHED;
+ INIT_LIST_HEAD(&ei->i_orphan);
return &ei->vfs_inode;
}
@@ -3062,6 +3280,14 @@ void btrfs_destroy_inode(struct inode *inode)
BTRFS_I(inode)->i_default_acl != BTRFS_ACL_NOT_CACHED)
posix_acl_release(BTRFS_I(inode)->i_default_acl);
+ spin_lock(&BTRFS_I(inode)->root->orphan_lock);
+ if (!list_empty(&BTRFS_I(inode)->i_orphan)) {
+ printk(KERN_ERR "BTRFS: inode %lu: inode still on the orphan"
+ " list\n", inode->i_ino);
+ dump_stack();
+ }
+ spin_unlock(&BTRFS_I(inode)->root->orphan_lock);
+
while(1) {
ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1);
if (!ordered)
@@ -3202,6 +3428,11 @@ static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
if (ret)
goto out_fail;
+ if (new_inode->i_nlink == 0) {
+ ret = btrfs_orphan_add(trans, new_inode);
+ if (ret)
+ goto out_fail;
+ }
}
ret = btrfs_set_inode_index(new_dir, old_inode);
if (ret)
diff --git a/fs/btrfs/orphan.c b/fs/btrfs/orphan.c
new file mode 100644
index 0000000..3c0d52a
--- /dev/null
+++ b/fs/btrfs/orphan.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2008 Red Hat. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include "ctree.h"
+#include "disk-io.h"
+
+int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 offset)
+{
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ int ret = 0;
+
+ key.objectid = BTRFS_ORPHAN_OBJECTID;
+ btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY);
+ key.offset = offset;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ ret = btrfs_insert_empty_item(trans, root, path, &key, 0);
+
+ btrfs_free_path(path);
+ return ret;
+}
+
+int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 offset)
+{
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ int ret = 0;
+
+ key.objectid = BTRFS_ORPHAN_OBJECTID;
+ btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY);
+ key.offset = offset;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
+ if (ret)
+ goto out;
+
+ ret = btrfs_del_item(trans, root, path);
+
+out:
+ btrfs_free_path(path);
+ return ret;
+}
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