struct btrfs_root *tree_root;
struct btrfs_root *chunk_root;
struct btrfs_root *dev_root;
+ struct btrfs_root *fs_root;
/* the log root tree is a directory of all the other log roots */
struct btrfs_root *log_root_tree;
struct btrfs_root_item root_item;
struct btrfs_key root_key;
struct btrfs_fs_info *fs_info;
- struct inode *inode;
struct extent_io_tree dirty_log_pages;
struct kobject root_kobj;
#define PageChecked PageFsMisc
#endif
+struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
+int btrfs_set_inode_index(struct inode *dir, u64 *index);
int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct inode *dir, struct inode *inode,
struct btrfs_trans_handle *trans, u64 new_dirid,
struct btrfs_block_group_cache *block_group);
-void btrfs_invalidate_dcache_root(struct btrfs_root *root, char *name,
- int namelen);
-
int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
size_t size, struct bio *bio, unsigned long bio_flags);
u64 objectid)
{
root->node = NULL;
- root->inode = NULL;
root->commit_root = NULL;
root->ref_tree = NULL;
root->sectorsize = sectorsize;
u32 blocksize;
u32 stripesize;
u64 generation;
+ struct btrfs_key location;
struct buffer_head *bh;
struct btrfs_root *extent_root = kzalloc(sizeof(struct btrfs_root),
GFP_NOFS);
goto fail_cleaner;
if (sb->s_flags & MS_RDONLY)
- return tree_root;
+ goto read_fs_root;
if (btrfs_super_log_root(disk_super) != 0) {
u32 blocksize;
ret = btrfs_cleanup_reloc_trees(tree_root);
BUG_ON(ret);
+ location.objectid = BTRFS_FS_TREE_OBJECTID;
+ location.type = BTRFS_ROOT_ITEM_KEY;
+ location.offset = (u64)-1;
+
+read_fs_root:
+ fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location);
+ if (!fs_info->fs_root)
+ goto fail_cleaner;
return tree_root;
fail_cleaner:
(unsigned long)root->root_key.objectid);
if (root->in_sysfs)
btrfs_sysfs_del_root(root);
- if (root->inode)
- iput(root->inode);
if (root->node)
free_extent_buffer(root->node);
if (root->commit_root)
return inode;
}
-static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
- struct nameidata *nd)
+struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry)
{
struct inode * inode;
struct btrfs_inode *bi = BTRFS_I(dir);
inode = btrfs_iget(dir->i_sb, &location, sub_root, &new);
if (IS_ERR(inode))
return ERR_CAST(inode);
-
- /* the inode and parent dir are two different roots */
- if (new && root != sub_root) {
- igrab(inode);
- sub_root->inode = inode;
- }
}
+ return inode;
+}
+
+static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
+ struct nameidata *nd)
+{
+ struct inode *inode;
+
+ if (dentry->d_name.len > BTRFS_NAME_LEN)
+ return ERR_PTR(-ENAMETOOLONG);
+
+ inode = btrfs_lookup_dentry(dir, dentry);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
return d_splice_alias(inode, dentry);
}
return 0;
filp->f_pos = 2;
}
-
path = btrfs_alloc_path();
path->reada = 2;
path->slots[0]++;
}
}
+
advance = 1;
item = btrfs_item_nr(leaf, slot);
btrfs_item_key_to_cpu(leaf, &found_key, slot);
d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
btrfs_dir_item_key_to_cpu(leaf, di, &location);
+
+ /* is this a reference to our own snapshot? If so
+ * skip it
+ */
+ if (location.type == BTRFS_ROOT_ITEM_KEY &&
+ location.objectid == root->root_key.objectid) {
+ over = 0;
+ goto skip;
+ }
over = filldir(dirent, name_ptr, name_len,
found_key.offset, location.objectid,
d_type);
+skip:
if (name_ptr != tmp_name)
kfree(name_ptr);
if (over)
goto nopos;
-
di_len = btrfs_dir_name_len(leaf, di) +
btrfs_dir_data_len(leaf, di) + sizeof(*di);
di_cur += di_len;
* helper to find a free sequence number in a given directory. This current
* code is very simple, later versions will do smarter things in the btree
*/
-static int btrfs_set_inode_index(struct inode *dir, struct inode *inode,
- u64 *index)
+int btrfs_set_inode_index(struct inode *dir, u64 *index)
{
int ret = 0;
return ERR_PTR(-ENOMEM);
if (dir) {
- ret = btrfs_set_inode_index(dir, inode, index);
+ ret = btrfs_set_inode_index(dir, index);
if (ret)
return ERR_PTR(ret);
}
err = btrfs_check_free_space(root, 1, 0);
if (err)
goto fail;
- err = btrfs_set_inode_index(dir, inode, &index);
+ err = btrfs_set_inode_index(dir, &index);
if (err)
goto fail;
* Invalidate a single dcache entry at the root of the filesystem.
* Needed after creation of snapshot or subvolume.
*/
-void btrfs_invalidate_dcache_root(struct btrfs_root *root, char *name,
+void btrfs_invalidate_dcache_root(struct inode *dir, char *name,
int namelen)
{
struct dentry *alias, *entry;
struct qstr qstr;
- alias = d_find_alias(root->fs_info->sb->s_root->d_inode);
+ alias = d_find_alias(dir);
if (alias) {
qstr.name = name;
qstr.len = namelen;
return PTR_ERR(inode);
inode->i_op = &btrfs_dir_inode_operations;
inode->i_fop = &btrfs_dir_file_operations;
- new_root->inode = inode;
inode->i_nlink = 1;
btrfs_i_size_write(inode, 0);
}
}
- ret = btrfs_set_inode_index(new_dir, old_inode, &index);
+ ret = btrfs_set_inode_index(new_dir, &index);
if (ret)
goto out_fail;
int err;
u64 objectid;
u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
+ u64 index = 0;
unsigned long nr = 1;
ret = btrfs_check_free_space(root, 1, 0);
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)
* insert the directory item
*/
key.offset = (u64)-1;
- dir = root->fs_info->sb->s_root->d_inode;
- ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
+ dir = dentry->d_parent->d_inode;
+ ret = btrfs_set_inode_index(dir, &index);
+ BUG_ON(ret);
+
+ ret = btrfs_insert_dir_item(trans, root,
name, namelen, dir->i_ino, &key,
- BTRFS_FT_DIR, 0);
+ BTRFS_FT_DIR, index);
if (ret)
goto fail;
-
+#if 0
ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
name, namelen, objectid,
root->fs_info->sb->s_root->d_inode->i_ino, 0);
if (ret)
goto fail;
-
+#endif
ret = btrfs_commit_transaction(trans, root);
if (ret)
goto fail_commit;
- new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
+ new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
BUG_ON(!new_root);
trans = btrfs_start_transaction(new_root, 1);
ret = err;
fail_commit:
btrfs_btree_balance_dirty(root, nr);
+printk("all done ret %d\n", ret);
return ret;
}
-static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
+static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
+ char *name, int namelen)
{
struct btrfs_pending_snapshot *pending_snapshot;
struct btrfs_trans_handle *trans;
- int ret;
+ int ret = 0;
int err;
unsigned long nr = 0;
if (ret)
goto fail_unlock;
- pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
+ pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
if (!pending_snapshot) {
ret = -ENOMEM;
goto fail_unlock;
}
memcpy(pending_snapshot->name, name, namelen);
pending_snapshot->name[namelen] = '\0';
+ pending_snapshot->dentry = dentry;
trans = btrfs_start_transaction(root, 1);
BUG_ON(!trans);
pending_snapshot->root = root;
list_add(&pending_snapshot->list,
&trans->transaction->pending_snapshots);
- ret = btrfs_update_inode(trans, root, root->inode);
err = btrfs_commit_transaction(trans, root);
fail_unlock:
* inside this filesystem so it's quite a bit simpler.
*/
static noinline int btrfs_mksubvol(struct path *parent, char *name,
- int mode, int namelen)
+ int mode, int namelen,
+ struct btrfs_root *snap_src)
{
struct dentry *dentry;
int error;
if (!IS_POSIXACL(parent->dentry->d_inode))
mode &= ~current->fs->umask;
+
error = mnt_want_write(parent->mnt);
if (error)
goto out_dput;
* Also we should pass on the mode eventually to allow creating new
* subvolume with specific mode bits.
*/
- error = create_subvol(BTRFS_I(parent->dentry->d_inode)->root, dentry,
- name, namelen);
+ if (snap_src) {
+ error = create_snapshot(snap_src, dentry, name, namelen);
+ } else {
+ error = create_subvol(BTRFS_I(parent->dentry->d_inode)->root,
+ dentry, name, namelen);
+ }
if (error)
goto out_drop_write;
}
static noinline int btrfs_ioctl_snap_create(struct file *file,
- void __user *arg)
+ void __user *arg, int subvol)
{
struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
struct btrfs_ioctl_vol_args *vol_args;
struct btrfs_dir_item *di;
struct btrfs_path *path;
+ struct file *src_file;
u64 root_dirid;
int namelen;
- int ret;
+ int ret = 0;
if (root->fs_info->sb->s_flags & MS_RDONLY)
return -EROFS;
goto out;
}
- if (root == root->fs_info->tree_root) {
+ if (subvol) {
ret = btrfs_mksubvol(&file->f_path, vol_args->name,
file->f_path.dentry->d_inode->i_mode,
- namelen);
+ namelen, NULL);
} else {
- ret = create_snapshot(root, vol_args->name, namelen);
+ struct inode *src_inode;
+ src_file = fget(vol_args->fd);
+ if (!src_file) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ src_inode = src_file->f_path.dentry->d_inode;
+ if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) {
+ printk("btrfs: Snapshot src from another FS\n");
+ ret = -EINVAL;
+ fput(src_file);
+ goto out;
+ }
+ ret = btrfs_mksubvol(&file->f_path, vol_args->name,
+ file->f_path.dentry->d_inode->i_mode,
+ namelen, BTRFS_I(src_inode)->root);
+ fput(src_file);
}
out:
switch (cmd) {
case BTRFS_IOC_SNAP_CREATE:
- return btrfs_ioctl_snap_create(file, (void __user *)arg);
+ return btrfs_ioctl_snap_create(file, (void __user *)arg, 0);
+ case BTRFS_IOC_SUBVOL_CREATE:
+ return btrfs_ioctl_snap_create(file, (void __user *)arg, 1);
case BTRFS_IOC_DEFRAG:
return btrfs_ioctl_defrag(file);
case BTRFS_IOC_RESIZE:
#define BTRFS_IOCTL_MAGIC 0x94
#define BTRFS_VOL_NAME_MAX 255
-#define BTRFS_PATH_NAME_MAX 4095
+#define BTRFS_PATH_NAME_MAX 3072
struct btrfs_ioctl_vol_args {
+ __s64 fd;
char name[BTRFS_PATH_NAME_MAX + 1];
};
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_BALANCE _IOW(BTRFS_IOCTL_MAGIC, 12, \
struct btrfs_ioctl_vol_args)
-
struct btrfs_ioctl_clone_range_args {
__s64 src_fd;
__u64 src_offset, src_length;
#define BTRFS_IOC_CLONE_RANGE _IOW(BTRFS_IOCTL_MAGIC, 13, \
struct btrfs_ioctl_clone_range_args)
+#define BTRFS_IOC_SUBVOL_CREATE _IOW(BTRFS_IOCTL_MAGIC, 14, \
+ struct btrfs_ioctl_vol_args)
+
#endif
out:
/*
* If no subvolume name is specified we use the default one. Allocate
- * a copy of the string "default" here so that code later in the
+ * a copy of the string "." here so that code later in the
* mount path doesn't care if it's the default volume or another one.
*/
if (!*subvol_name) {
- *subvol_name = kstrdup("default", GFP_KERNEL);
+ *subvol_name = kstrdup(".", GFP_KERNEL);
if (!*subvol_name)
return -ENOMEM;
}
}
sb->s_fs_info = tree_root;
disk_super = &tree_root->fs_info->super_copy;
- inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super),
- tree_root);
+ inode = btrfs_iget_locked(sb, BTRFS_FIRST_FREE_OBJECTID,
+ tree_root->fs_info->fs_root);
bi = BTRFS_I(inode);
bi->location.objectid = inode->i_ino;
bi->location.offset = 0;
- bi->root = tree_root;
+ bi->root = tree_root->fs_info->fs_root;
btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY);
struct extent_buffer *tmp;
struct extent_buffer *old;
int ret;
- int namelen;
u64 objectid;
new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS);
if (ret)
goto fail;
+ key.offset = (u64)-1;
+ memcpy(&pending->root_key, &key, sizeof(key));
+fail:
+ kfree(new_root_item);
+ return ret;
+}
+
+static noinline int finish_pending_snapshot(struct btrfs_fs_info *fs_info,
+ struct btrfs_pending_snapshot *pending)
+{
+ int ret;
+ int namelen;
+ u64 index = 0;
+ struct btrfs_trans_handle *trans;
+ struct inode *parent_inode;
+ struct inode *inode;
+
+ trans = btrfs_start_transaction(fs_info->fs_root, 1);
+
/*
* insert the directory item
*/
- key.offset = (u64)-1;
namelen = strlen(pending->name);
- ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
- pending->name, namelen,
- root->fs_info->sb->s_root->d_inode->i_ino,
- &key, BTRFS_FT_DIR, 0);
+ 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,
+ pending->name, namelen,
+ parent_inode->i_ino,
+ &pending->root_key, BTRFS_FT_DIR, index);
if (ret)
goto fail;
-
+#if 0
ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
pending->name, strlen(pending->name), objectid,
root->fs_info->sb->s_root->d_inode->i_ino, 0);
-
- /* Invalidate existing dcache entry for new snapshot. */
- btrfs_invalidate_dcache_root(root, pending->name, namelen);
-
+#endif
+ inode = btrfs_lookup_dentry(parent_inode, pending->dentry);
+ d_instantiate(pending->dentry, inode);
fail:
- kfree(new_root_item);
+ btrfs_end_transaction(trans, fs_info->fs_root);
return ret;
}
*/
static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_pending_snapshot *pending;
+ struct list_head *head = &trans->transaction->pending_snapshots;
+ struct list_head *cur;
+ int ret;
+
+ list_for_each(cur, head) {
+ pending = list_entry(cur, struct btrfs_pending_snapshot, list);
+ ret = create_pending_snapshot(trans, fs_info, pending);
+ BUG_ON(ret);
+ }
+ return 0;
+}
+
+static noinline int finish_pending_snapshots(struct btrfs_trans_handle *trans,
+ struct btrfs_fs_info *fs_info)
{
struct btrfs_pending_snapshot *pending;
struct list_head *head = &trans->transaction->pending_snapshots;
while(!list_empty(head)) {
pending = list_entry(head->next,
struct btrfs_pending_snapshot, list);
- ret = create_pending_snapshot(trans, fs_info, pending);
+ ret = finish_pending_snapshot(fs_info, pending);
BUG_ON(ret);
list_del(&pending->list);
kfree(pending->name);
btrfs_drop_dead_reloc_roots(root);
mutex_unlock(&root->fs_info->tree_reloc_mutex);
+ /* do the directory inserts of any pending snapshot creations */
+ finish_pending_snapshots(trans, root->fs_info);
+
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);
+
put_transaction(cur_trans);
put_transaction(cur_trans);
list_splice_init(&root->fs_info->dead_roots, &dirty_fs_roots);
mutex_unlock(&root->fs_info->trans_mutex);
+
kmem_cache_free(btrfs_trans_handle_cachep, trans);
if (root->fs_info->closing) {
};
struct btrfs_pending_snapshot {
+ struct dentry *dentry;
struct btrfs_root *root;
char *name;
+ struct btrfs_key root_key;
struct list_head list;
};
projects / karo-tx-linux.git / commitdiff