#include <linux/version.h>
#include <linux/xattr.h>
#include <linux/vmalloc.h>
+#include "compat.h"
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
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);
* 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;
- 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;
+ /* add the backref first */
+ ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
+ objectid, BTRFS_ROOT_BACKREF_KEY,
+ root->root_key.objectid,
+ dir->i_ino, index, name, namelen);
+
+ BUG_ON(ret);
+
+ /* now add the forward ref */
+ ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
+ root->root_key.objectid, BTRFS_ROOT_REF_KEY,
+ objectid,
+ dir->i_ino, index, name, namelen);
+
+ BUG_ON(ret);
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);
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) {
+ struct dentry *dir = dentry->d_parent;
+ struct dentry *test = dir->d_parent;
+ struct btrfs_path *path = btrfs_alloc_path();
+ int ret;
+ u64 test_oid;
+ u64 parent_oid = BTRFS_I(dir->d_inode)->root->root_key.objectid;
+
+ test_oid = snap_src->root_key.objectid;
+
+ ret = btrfs_find_root_ref(snap_src->fs_info->tree_root,
+ path, parent_oid, test_oid);
+ if (ret == 0)
+ goto create;
+ btrfs_release_path(snap_src->fs_info->tree_root, path);
+
+ /* we need to make sure we aren't creating a directory loop
+ * by taking a snapshot of something that has our current
+ * subvol in its directory tree. So, this loops through
+ * the dentries and checks the forward refs for each subvolume
+ * to see if is references the subvolume where we are
+ * placing this new snapshot.
+ */
+ while(1) {
+ if (!test ||
+ dir == snap_src->fs_info->sb->s_root ||
+ test == snap_src->fs_info->sb->s_root ||
+ test->d_inode->i_sb != snap_src->fs_info->sb) {
+ break;
+ }
+ if (S_ISLNK(test->d_inode->i_mode)) {
+ printk("Symlink in snapshot path, failed\n");
+ error = -EMLINK;
+ btrfs_free_path(path);
+ goto out_drop_write;
+ }
+ test_oid =
+ BTRFS_I(test->d_inode)->root->root_key.objectid;
+ ret = btrfs_find_root_ref(snap_src->fs_info->tree_root,
+ path, test_oid, parent_oid);
+ if (ret == 0) {
+ printk("Snapshot creation failed, looping\n");
+ error = -EMLINK;
+ btrfs_free_path(path);
+ goto out_drop_write;
+ }
+ btrfs_release_path(snap_src->fs_info->tree_root, path);
+ test = test->d_parent;
+ }
+create:
+ btrfs_free_path(path);
+ 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;
}
-int btrfs_defrag_file(struct file *file)
+static int btrfs_defrag_file(struct file *file)
{
struct inode *inode = fdentry(file)->d_inode;
struct btrfs_root *root = BTRFS_I(inode)->root;
devid = simple_strtoull(devstr, &end, 10);
printk(KERN_INFO "resizing devid %llu\n", devid);
}
- device = btrfs_find_device(root, devid, NULL);
+ device = btrfs_find_device(root, devid, NULL, NULL);
if (!device) {
printk(KERN_INFO "resizer unable to find device %llu\n", devid);
ret = -EINVAL;
}
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:
return 0;
}
-long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
+static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
{
struct btrfs_ioctl_vol_args *vol_args;
int ret;
return ret;
}
-long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
+static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
{
struct btrfs_ioctl_vol_args *vol_args;
int ret;
return ret;
}
-long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off,
- u64 olen, u64 destoff)
+static long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
+ u64 off, u64 olen, u64 destoff)
{
struct inode *inode = fdentry(file)->d_inode;
struct btrfs_root *root = BTRFS_I(inode)->root;
slot = path->slots[0];
btrfs_item_key_to_cpu(leaf, &key, slot);
- if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY ||
+ if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
key.objectid != src->i_ino)
break;
btrfs_mark_buffer_dirty(leaf);
}
- if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) {
- u32 size;
- struct btrfs_key new_key;
- u64 coverslen;
- int coff, clen;
-
- size = btrfs_item_size_nr(leaf, slot);
- coverslen = (size / BTRFS_CRC32_SIZE) <<
- root->fs_info->sb->s_blocksize_bits;
- printk("csums for %llu~%llu\n",
- key.offset, coverslen);
- if (key.offset + coverslen < off ||
- key.offset >= off+len)
- goto next;
-
- read_extent_buffer(leaf, buf,
- btrfs_item_ptr_offset(leaf, slot),
- size);
- btrfs_release_path(root, path);
-
- coff = 0;
- if (off > key.offset)
- coff = ((off - key.offset) >>
- root->fs_info->sb->s_blocksize_bits) *
- BTRFS_CRC32_SIZE;
- clen = size - coff;
- if (key.offset + coverslen > off+len)
- clen -= ((key.offset+coverslen-off-len) >>
- root->fs_info->sb->s_blocksize_bits) *
- BTRFS_CRC32_SIZE;
- printk(" will dup %d~%d of %d\n",
- coff, clen, size);
-
- memcpy(&new_key, &key, sizeof(new_key));
- new_key.objectid = inode->i_ino;
- new_key.offset = key.offset + destoff - off;
-
- ret = btrfs_insert_empty_item(trans, root, path,
- &new_key, clen);
- if (ret)
- goto out;
-
- leaf = path->nodes[0];
- slot = path->slots[0];
- write_extent_buffer(leaf, buf + coff,
- btrfs_item_ptr_offset(leaf, slot),
- clen);
- btrfs_mark_buffer_dirty(leaf);
- }
-
next:
btrfs_release_path(root, path);
key.offset++;
return ret;
}
-long btrfs_ioctl_clone_range(struct file *file, unsigned long argptr)
+static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
{
struct btrfs_ioctl_clone_range_args args;
- if (copy_from_user(&args, (void *)argptr, sizeof(args)))
+ if (copy_from_user(&args, argp, sizeof(args)))
return -EFAULT;
return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
args.src_length, args.dest_offset);
* basically own the machine, and have a very in depth understanding
* of all the possible deadlocks and enospc problems.
*/
-long btrfs_ioctl_trans_start(struct file *file)
+static long btrfs_ioctl_trans_start(struct file *file)
{
struct inode *inode = fdentry(file)->d_inode;
struct btrfs_root *root = BTRFS_I(inode)->root;
cmd, unsigned long arg)
{
struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
+ void __user *argp = (void __user *)arg;
switch (cmd) {
case BTRFS_IOC_SNAP_CREATE:
- return btrfs_ioctl_snap_create(file, (void __user *)arg);
+ return btrfs_ioctl_snap_create(file, argp, 0);
+ case BTRFS_IOC_SUBVOL_CREATE:
+ return btrfs_ioctl_snap_create(file, argp, 1);
case BTRFS_IOC_DEFRAG:
return btrfs_ioctl_defrag(file);
case BTRFS_IOC_RESIZE:
- return btrfs_ioctl_resize(root, (void __user *)arg);
+ return btrfs_ioctl_resize(root, argp);
case BTRFS_IOC_ADD_DEV:
- return btrfs_ioctl_add_dev(root, (void __user *)arg);
+ return btrfs_ioctl_add_dev(root, argp);
case BTRFS_IOC_RM_DEV:
- return btrfs_ioctl_rm_dev(root, (void __user *)arg);
+ return btrfs_ioctl_rm_dev(root, argp);
case BTRFS_IOC_BALANCE:
return btrfs_balance(root->fs_info->dev_root);
case BTRFS_IOC_CLONE:
return btrfs_ioctl_clone(file, arg, 0, 0, 0);
case BTRFS_IOC_CLONE_RANGE:
- return btrfs_ioctl_clone_range(file, arg);
+ return btrfs_ioctl_clone_range(file, argp);
case BTRFS_IOC_TRANS_START:
return btrfs_ioctl_trans_start(file);
case BTRFS_IOC_TRANS_END:
return btrfs_ioctl_trans_end(file);
case BTRFS_IOC_SYNC:
- btrfs_start_delalloc_inodes(root);
btrfs_sync_fs(file->f_dentry->d_sb, 1);
return 0;
}
projects / deliverable / linux.git / blobdiff