Btrfs: start of support for many FS volumes
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 32224ff..66d9fb2 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -16,9 +16,23 @@
#include "transaction.h"
#include "btrfs_inode.h"
+void btrfs_fsinfo_release(struct kobject *obj)
+{
+ struct btrfs_fs_info *fsinfo = container_of(obj,
+ struct btrfs_fs_info, kobj);
+ kfree(fsinfo);
+}
+
+struct kobj_type btrfs_fsinfo_ktype = {
+ .release = btrfs_fsinfo_release,
+};
+
+decl_subsys(btrfs, &btrfs_fsinfo_ktype, NULL);
+
#define BTRFS_SUPER_MAGIC 0x9123682E
static struct inode_operations btrfs_dir_inode_operations;
+static struct inode_operations btrfs_dir_ro_inode_operations;
static struct super_operations btrfs_super_ops;
static struct file_operations btrfs_dir_file_operations;
static struct inode_operations btrfs_file_inode_operations;
@@ -37,7 +51,8 @@
{
struct btrfs_path *path;
struct btrfs_inode_item *inode_item;
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct btrfs_key location;
int ret;
path = btrfs_alloc_path();
@@ -46,13 +61,12 @@
mutex_lock(&root->fs_info->fs_mutex);
check_inode(inode);
- ret = btrfs_lookup_inode(NULL, root, path, inode->i_ino, 0);
+
+ memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
+ ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
if (ret) {
- btrfs_release_path(root, path);
btrfs_free_path(path);
- mutex_unlock(&root->fs_info->fs_mutex);
- make_bad_inode(inode);
- return;
+ goto make_bad;
}
check_inode(inode);
inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
@@ -73,7 +87,6 @@
inode->i_blocks = btrfs_inode_nblocks(inode_item);
inode->i_generation = btrfs_inode_generation(inode_item);
- btrfs_release_path(root, path);
btrfs_free_path(path);
inode_item = NULL;
@@ -92,8 +105,11 @@
inode->i_op = &btrfs_file_inode_operations;
break;
case S_IFDIR:
- inode->i_op = &btrfs_dir_inode_operations;
inode->i_fop = &btrfs_dir_file_operations;
+ if (root == root->fs_info->tree_root)
+ inode->i_op = &btrfs_dir_ro_inode_operations;
+ else
+ inode->i_op = &btrfs_dir_inode_operations;
break;
case S_IFLNK:
// inode->i_op = &page_symlink_inode_operations;
@@ -101,6 +117,12 @@
}
check_inode(inode);
return;
+
+make_bad:
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ make_bad_inode(inode);
}
static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
@@ -128,7 +150,7 @@
}
di = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
struct btrfs_dir_item);
- objectid = btrfs_dir_objectid(di);
+ objectid = btrfs_disk_key_objectid(&di->location);
ret = btrfs_del_item(trans, root, path);
BUG_ON(ret);
@@ -157,7 +179,7 @@
struct btrfs_trans_handle *trans;
int ret;
- root = btrfs_sb(dir->i_sb);
+ root = BTRFS_I(dir)->root;
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
ret = btrfs_unlink_trans(trans, root, dir, dentry);
@@ -171,7 +193,7 @@
struct inode *inode = dentry->d_inode;
int err;
int ret;
- struct btrfs_root *root = btrfs_sb(dir->i_sb);
+ struct btrfs_root *root = BTRFS_I(dir)->root;
struct btrfs_path *path;
struct btrfs_key key;
struct btrfs_trans_handle *trans;
@@ -268,7 +290,8 @@
BUG_ON(ret);
btrfs_release_path(root, path);
- ret = btrfs_lookup_inode(trans, root, path, objectid, -1);
+ ret = btrfs_lookup_inode(trans, root, path,
+ &BTRFS_I(inode)->location, -1);
BUG_ON(ret);
ret = btrfs_del_item(trans, root, path);
BUG_ON(ret);
@@ -355,7 +378,7 @@
static void btrfs_delete_inode(struct inode *inode)
{
struct btrfs_trans_handle *trans;
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_root *root = BTRFS_I(inode)->root;
int ret;
truncate_inode_pages(&inode->i_data, 0);
@@ -378,13 +401,13 @@
}
static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
- ino_t *ino)
+ struct btrfs_key *location)
{
const char *name = dentry->d_name.name;
int namelen = dentry->d_name.len;
struct btrfs_dir_item *di;
struct btrfs_path *path;
- struct btrfs_root *root = btrfs_sb(dir->i_sb);
+ struct btrfs_root *root = BTRFS_I(dir)->root;
int ret;
path = btrfs_alloc_path();
@@ -393,13 +416,13 @@
ret = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
namelen, 0);
if (ret || !btrfs_match_dir_item_name(root, path, name, namelen)) {
- *ino = 0;
+ location->objectid = 0;
ret = 0;
goto out;
}
di = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
struct btrfs_dir_item);
- *ino = btrfs_dir_objectid(di);
+ btrfs_disk_key_to_cpu(location, &di->location);
out:
btrfs_release_path(root, path);
btrfs_free_path(path);
@@ -407,26 +430,76 @@
return ret;
}
+int fixup_tree_root_location(struct btrfs_root *root,
+ struct btrfs_key *location,
+ struct btrfs_root **sub_root)
+{
+ struct btrfs_path *path;
+ struct btrfs_root_item *ri;
+ int ret;
+
+ if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
+ return 0;
+ if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
+ return 0;
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ mutex_lock(&root->fs_info->fs_mutex);
+
+ ret = btrfs_lookup_inode(NULL, root, path, location, 0);
+ if (ret)
+ goto out;
+ ri = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+ path->slots[0],
+ struct btrfs_root_item);
+ location->objectid = btrfs_root_dirid(ri);
+ location->flags = 0;
+ btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
+ location->offset = 0;
+ /* FIXME properly select the root */
+ *sub_root = root->fs_info->fs_root;
+out:
+ btrfs_free_path(path);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return ret;
+}
+
+
static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
{
struct inode * inode;
- struct btrfs_root *root = btrfs_sb(dir->i_sb);
- ino_t ino;
+ struct btrfs_inode *bi = BTRFS_I(dir);
+ struct btrfs_root *root = bi->root;
+ struct btrfs_root *sub_root = root;
+ struct btrfs_key location;
int ret;
if (dentry->d_name.len > BTRFS_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
mutex_lock(&root->fs_info->fs_mutex);
- ret = btrfs_inode_by_name(dir, dentry, &ino);
+ ret = btrfs_inode_by_name(dir, dentry, &location);
mutex_unlock(&root->fs_info->fs_mutex);
if (ret < 0)
return ERR_PTR(ret);
inode = NULL;
- if (ino) {
- inode = iget(dir->i_sb, ino);
+ if (location.objectid) {
+ ret = fixup_tree_root_location(root, &location, &sub_root);
+ if (ret < 0)
+ return ERR_PTR(ret);
+ if (ret > 0)
+ return ERR_PTR(-ENOENT);
+ inode = iget_locked(dir->i_sb, location.objectid);
if (!inode)
return ERR_PTR(-EACCES);
+ if (inode->i_state & I_NEW) {
+ BTRFS_I(inode)->root = sub_root;
+ memcpy(&BTRFS_I(inode)->location, &location,
+ sizeof(location));
+ btrfs_read_locked_inode(inode);
+ unlock_new_inode(inode);
+ }
check_inode(inode);
}
check_inode(dir);
@@ -436,7 +509,7 @@
static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
struct inode *inode = filp->f_path.dentry->d_inode;
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_item *item;
struct btrfs_dir_item *di;
struct btrfs_key key;
@@ -448,11 +521,16 @@
int advance;
unsigned char d_type = DT_UNKNOWN;
int over = 0;
+ int key_type = BTRFS_DIR_INDEX_KEY;
+
+ /* FIXME, use a real flag for deciding about the key type */
+ if (root->fs_info->tree_root == root)
+ key_type = BTRFS_DIR_ITEM_KEY;
mutex_lock(&root->fs_info->fs_mutex);
key.objectid = inode->i_ino;
key.flags = 0;
- btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
+ btrfs_set_key_type(&key, key_type);
key.offset = filp->f_pos;
path = btrfs_alloc_path();
btrfs_init_path(path);
@@ -482,10 +560,11 @@
item = leaf->items + slot;
if (btrfs_disk_key_objectid(&item->key) != key.objectid)
break;
- if (btrfs_disk_key_offset(&item->key) >
+ if (key_type == BTRFS_DIR_INDEX_KEY &&
+ btrfs_disk_key_offset(&item->key) >
root->fs_info->highest_inode)
break;
- if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_INDEX_KEY)
+ if (btrfs_disk_key_type(&item->key) != key_type)
continue;
if (btrfs_disk_key_offset(&item->key) < filp->f_pos)
continue;
@@ -495,7 +574,7 @@
over = filldir(dirent, (const char *)(di + 1),
btrfs_dir_name_len(di),
btrfs_disk_key_offset(&item->key),
- btrfs_dir_objectid(di), d_type);
+ btrfs_disk_key_objectid(&di->location), d_type);
if (over)
goto nopos;
}
@@ -527,6 +606,7 @@
struct dentry * root_dentry;
struct btrfs_super_block *disk_super;
struct btrfs_root *root;
+ struct btrfs_inode *bi;
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_magic = BTRFS_SUPER_MAGIC;
@@ -546,6 +626,13 @@
btrfs_super_root_dir(disk_super));
inode = iget_locked(sb, btrfs_super_root_dir(disk_super));
+ bi = BTRFS_I(inode);
+ bi->location.objectid = inode->i_ino;
+ bi->location.offset = 0;
+ bi->location.flags = 0;
+ bi->root = root->fs_info->tree_root;
+ btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY);
+
if (!inode)
return -ENOMEM;
if (inode->i_state & I_NEW) {
@@ -594,7 +681,8 @@
BUG_ON(!path);
btrfs_init_path(path);
- ret = btrfs_lookup_inode(trans, root, path, inode->i_ino, 1);
+ ret = btrfs_lookup_inode(trans, root, path,
+ &BTRFS_I(inode)->location, 1);
if (ret) {
if (ret > 0)
ret = -ENOENT;
@@ -616,7 +704,7 @@
static int btrfs_write_inode(struct inode *inode, int wait)
{
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans;
int ret;
@@ -637,8 +725,8 @@
{
struct inode *inode;
struct btrfs_inode_item inode_item;
- struct btrfs_root *root = btrfs_sb(dir->i_sb);
- struct btrfs_key key;
+ struct btrfs_root *root = BTRFS_I(dir)->root;
+ struct btrfs_key *key;
int ret;
u64 objectid;
@@ -646,6 +734,8 @@
if (!inode)
return ERR_PTR(-ENOMEM);
+ BTRFS_I(inode)->root = BTRFS_I(dir)->root;
+ key = &BTRFS_I(inode)->location;
check_inode(inode);
ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
BUG_ON(ret);
@@ -658,11 +748,11 @@
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
fill_inode_item(&inode_item, inode);
- key.objectid = objectid;
- key.flags = 0;
- key.offset = 0;
- btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
- ret = btrfs_insert_inode_map(trans, root, objectid, &key);
+ key->objectid = objectid;
+ key->flags = 0;
+ key->offset = 0;
+ btrfs_set_key_type(key, BTRFS_INODE_ITEM_KEY);
+ ret = btrfs_insert_inode_map(trans, root, objectid, key);
BUG_ON(ret);
ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
@@ -678,13 +768,20 @@
struct dentry *dentry, struct inode *inode)
{
int ret;
- ret = btrfs_insert_dir_item(trans, btrfs_sb(inode->i_sb),
+ struct btrfs_key key;
+ struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
+ key.objectid = inode->i_ino;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
+ key.offset = 0;
+
+ ret = btrfs_insert_dir_item(trans, root,
dentry->d_name.name, dentry->d_name.len,
dentry->d_parent->d_inode->i_ino,
- inode->i_ino, 0);
+ &key, 0);
if (ret == 0) {
dentry->d_parent->d_inode->i_size += dentry->d_name.len * 2;
- ret = btrfs_update_inode(trans, btrfs_sb(inode->i_sb),
+ ret = btrfs_update_inode(trans, root,
dentry->d_parent->d_inode);
}
check_inode(inode);
@@ -710,7 +807,7 @@
int mode, struct nameidata *nd)
{
struct btrfs_trans_handle *trans;
- struct btrfs_root *root = btrfs_sb(dir->i_sb);
+ struct btrfs_root *root = BTRFS_I(dir)->root;
struct inode *inode;
int err;
int drop_inode = 0;
@@ -747,18 +844,26 @@
static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
struct inode *inode, struct inode *dir)
{
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_root *root = BTRFS_I(dir)->root;
int ret;
char buf[2];
+ struct btrfs_key key;
+
buf[0] = '.';
buf[1] = '.';
+ key.objectid = inode->i_ino;
+ key.offset = 0;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
+
ret = btrfs_insert_dir_item(trans, root, buf, 1, inode->i_ino,
- inode->i_ino, 1);
+ &key, 1);
if (ret)
goto error;
+ key.objectid = dir->i_ino;
ret = btrfs_insert_dir_item(trans, root, buf, 2, inode->i_ino,
- dir->i_ino, 1);
+ &key, 1);
if (ret)
goto error;
inode->i_size = 6;
@@ -771,7 +876,7 @@
{
struct inode *inode;
struct btrfs_trans_handle *trans;
- struct btrfs_root *root = btrfs_sb(dir->i_sb);
+ struct btrfs_root *root = BTRFS_I(dir)->root;
int err = 0;
int drop_on_err = 0;
@@ -910,7 +1015,7 @@
u64 extent_end = 0;
u64 objectid = inode->i_ino;
struct btrfs_path *path;
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans = NULL;
struct btrfs_file_extent_item *item;
struct btrfs_leaf *leaf;
@@ -999,7 +1104,7 @@
struct buffer_head *result, int create)
{
int err;
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_root *root = BTRFS_I(inode)->root;
mutex_lock(&root->fs_info->fs_mutex);
err = btrfs_get_block_lock(inode, iblock, result, create);
// err = btrfs_get_block_inline(inode, iblock, result, create);
@@ -1041,7 +1146,7 @@
static void btrfs_truncate(struct inode *inode)
{
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_root *root = BTRFS_I(inode)->root;
int ret;
struct btrfs_trans_handle *trans;
@@ -1208,7 +1313,7 @@
int err = 0;
int ret = 0;
struct inode *inode = file->f_path.dentry->d_inode;
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_root *root = BTRFS_I(inode)->root;
struct page *pages[1];
if (file->f_flags & O_DIRECT)
@@ -1365,7 +1470,7 @@
int err = 0;
int ret = 0;
struct inode *inode = file->f_path.dentry->d_inode;
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
+ struct btrfs_root *root = BTRFS_I(inode)->root;
unsigned long page_index;
if (file->f_flags & O_DIRECT)
@@ -1432,13 +1537,14 @@
{
char *kaddr;
unsigned long left, count = desc->count;
+ struct inode *inode = page->mapping->host;
if (size > count)
size = count;
if (!PageChecked(page)) {
/* FIXME, do it per block */
- struct btrfs_root *root = btrfs_sb(page->mapping->host->i_sb);
+ struct btrfs_root *root = BTRFS_I(inode)->root;
int ret = btrfs_csum_verify_file_block(root,
page->mapping->host->i_ino,
page->index << PAGE_CACHE_SHIFT,
@@ -1662,6 +1768,10 @@
.rmdir = btrfs_rmdir,
};
+static struct inode_operations btrfs_dir_ro_inode_operations = {
+ .lookup = btrfs_lookup,
+};
+
static struct file_operations btrfs_dir_file_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
@@ -1697,13 +1807,21 @@
err = init_inodecache();
if (err)
return err;
+ kset_set_kset_s(&btrfs_subsys, fs_subsys);
+ err = subsystem_register(&btrfs_subsys);
+ if (err)
+ goto out;
return register_filesystem(&btrfs_fs_type);
+out:
+ destroy_inodecache();
+ return err;
}
static void __exit exit_btrfs_fs(void)
{
destroy_inodecache();
unregister_filesystem(&btrfs_fs_type);
+ subsystem_unregister(&btrfs_subsys);
printk("btrfs unloaded\n");
}