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Btrfs: Give each subvol and snapshot their own anonymous devid

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Each subvolume has its own private inode number space, and so we need
to fill in different device numbers for each subvolume to avoid confusing
applications.

This commit puts a struct super_block into struct btrfs_root so it can
call set_anon_super() and get a different device number generated for
each root.

btrfs_rename is changed to prevent renames across subvols.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-11-17 20:42:26 -05:00
parent 3de4586c52
commit 3394e1607e
5 changed files with 34 additions and 6 deletions
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6
fs/btrfs/ctree.h
View file

@ -799,6 +799,12 @@ struct btrfs_root {
spinlock_t list_lock;
struct list_head dead_list;
struct list_head orphan_list;
/*
* right now this just gets used so that a root has its own devid
* for stat. It may be used for more later
*/
struct super_block anon_super;
};
/*

13
fs/btrfs/disk-io.c
View file

@ -877,6 +877,12 @@ static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
root->defrag_running = 0;
root->defrag_level = 0;
root->root_key.objectid = objectid;
root->anon_super.s_root = NULL;
root->anon_super.s_dev = 0;
INIT_LIST_HEAD(&root->anon_super.s_list);
INIT_LIST_HEAD(&root->anon_super.s_instances);
init_rwsem(&root->anon_super.s_umount);
return 0;
}
@ -1083,6 +1089,9 @@ struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location);
if (IS_ERR(root))
return root;
set_anon_super(&root->anon_super, NULL);
ret = radix_tree_insert(&fs_info->fs_roots_radix,
(unsigned long)root->root_key.objectid,
root);
@ -1950,6 +1959,10 @@ int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
{
radix_tree_delete(&fs_info->fs_roots_radix,
(unsigned long)root->root_key.objectid);
if (root->anon_super.s_dev) {
down_write(&root->anon_super.s_umount);
kill_anon_super(&root->anon_super);
}
if (root->in_sysfs)
btrfs_sysfs_del_root(root);
if (root->node)

15
fs/btrfs/inode.c
View file

@ -2212,7 +2212,12 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
struct btrfs_trans_handle *trans;
unsigned long nr = 0;
if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
/*
* the FIRST_FREE_OBJECTID check makes sure we don't try to rmdir
* the root of a subvolume or snapshot
*/
if (inode->i_size > BTRFS_EMPTY_DIR_SIZE ||
inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) {
return -ENOTEMPTY;
}
@ -4410,7 +4415,6 @@ int btrfs_create_subvol_root(struct btrfs_root *new_root, struct dentry *dentry,
if (error)
return error;
atomic_inc(&inode->i_count);
d_instantiate(dentry, inode);
return 0;
}
@ -4548,6 +4552,7 @@ static int btrfs_getattr(struct vfsmount *mnt,
{
struct inode *inode = dentry->d_inode;
generic_fillattr(inode, stat);
stat->dev = BTRFS_I(inode)->root->anon_super.s_dev;
stat->blksize = PAGE_CACHE_SIZE;
stat->blocks = (inode_get_bytes(inode) +
BTRFS_I(inode)->delalloc_bytes) >> 9;
@ -4565,6 +4570,11 @@ static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
u64 index = 0;
int ret;
/* we're not allowed to rename between subvolumes */
if (BTRFS_I(old_inode)->root->root_key.objectid !=
BTRFS_I(new_dir)->root->root_key.objectid)
return -EXDEV;
if (S_ISDIR(old_inode->i_mode) && new_inode &&
new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
return -ENOTEMPTY;
@ -4920,6 +4930,7 @@ static int btrfs_permission(struct inode *inode, int mask)
}
static struct inode_operations btrfs_dir_inode_operations = {
.getattr = btrfs_getattr,
.lookup = btrfs_lookup,
.create = btrfs_create,
.unlink = btrfs_unlink,

2
fs/btrfs/ioctl.c
View file

@ -127,7 +127,6 @@ static noinline int create_subvol(struct btrfs_root *root,
key.objectid = objectid;
key.offset = 1;
btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
printk("inserting root objectid %Lu\n", objectid);
ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
&root_item);
if (ret)
@ -175,7 +174,6 @@ fail:
ret = err;
fail_commit:
btrfs_btree_balance_dirty(root, nr);
printk("all done ret %d\n", ret);
return ret;
}

4
fs/btrfs/transaction.c
View file

@ -832,13 +832,13 @@ static noinline int finish_pending_snapshot(struct btrfs_fs_info *fs_info,
struct inode *parent_inode;
struct inode *inode;
trans = btrfs_start_transaction(fs_info->fs_root, 1);
parent_inode = pending->dentry->d_parent->d_inode;
trans = btrfs_start_transaction(BTRFS_I(parent_inode)->root, 1);
/*
* insert the directory item
*/
namelen = strlen(pending->name);
parent_inode = pending->dentry->d_parent->d_inode;
ret = btrfs_set_inode_index(parent_inode, &index);
ret = btrfs_insert_dir_item(trans,
BTRFS_I(parent_inode)->root,