#include <linux/time.h>
#include <linux/init.h>
#include <linux/string.h>
-#include <linux/smp_lock.h>
#include <linux/backing-dev.h>
#include <linux/mount.h>
#include <linux/mpage.h>
#include <linux/compat.h>
#include <linux/bit_spinlock.h>
#include <linux/security.h>
-#include <linux/version.h>
#include <linux/xattr.h>
#include <linux/vmalloc.h>
#include "compat.h"
#include "volumes.h"
#include "locking.h"
+/* Mask out flags that are inappropriate for the given type of inode. */
+static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
+{
+ if (S_ISDIR(mode))
+ return flags;
+ else if (S_ISREG(mode))
+ return flags & ~FS_DIRSYNC_FL;
+ else
+ return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
+}
+
+/*
+ * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
+ */
+static unsigned int btrfs_flags_to_ioctl(unsigned int flags)
+{
+ unsigned int iflags = 0;
+
+ if (flags & BTRFS_INODE_SYNC)
+ iflags |= FS_SYNC_FL;
+ if (flags & BTRFS_INODE_IMMUTABLE)
+ iflags |= FS_IMMUTABLE_FL;
+ if (flags & BTRFS_INODE_APPEND)
+ iflags |= FS_APPEND_FL;
+ if (flags & BTRFS_INODE_NODUMP)
+ iflags |= FS_NODUMP_FL;
+ if (flags & BTRFS_INODE_NOATIME)
+ iflags |= FS_NOATIME_FL;
+ if (flags & BTRFS_INODE_DIRSYNC)
+ iflags |= FS_DIRSYNC_FL;
+
+ return iflags;
+}
+
+/*
+ * Update inode->i_flags based on the btrfs internal flags.
+ */
+void btrfs_update_iflags(struct inode *inode)
+{
+ struct btrfs_inode *ip = BTRFS_I(inode);
+
+ inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
+
+ if (ip->flags & BTRFS_INODE_SYNC)
+ inode->i_flags |= S_SYNC;
+ if (ip->flags & BTRFS_INODE_IMMUTABLE)
+ inode->i_flags |= S_IMMUTABLE;
+ if (ip->flags & BTRFS_INODE_APPEND)
+ inode->i_flags |= S_APPEND;
+ if (ip->flags & BTRFS_INODE_NOATIME)
+ inode->i_flags |= S_NOATIME;
+ if (ip->flags & BTRFS_INODE_DIRSYNC)
+ inode->i_flags |= S_DIRSYNC;
+}
+
+/*
+ * Inherit flags from the parent inode.
+ *
+ * Unlike extN we don't have any flags we don't want to inherit currently.
+ */
+void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
+{
+ unsigned int flags;
+
+ if (!dir)
+ return;
+
+ flags = BTRFS_I(dir)->flags;
+
+ if (S_ISREG(inode->i_mode))
+ flags &= ~BTRFS_INODE_DIRSYNC;
+ else if (!S_ISDIR(inode->i_mode))
+ flags &= (BTRFS_INODE_NODUMP | BTRFS_INODE_NOATIME);
+
+ BTRFS_I(inode)->flags = flags;
+ btrfs_update_iflags(inode);
+}
+
+static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
+{
+ struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode);
+ unsigned int flags = btrfs_flags_to_ioctl(ip->flags);
+
+ if (copy_to_user(arg, &flags, sizeof(flags)))
+ return -EFAULT;
+ return 0;
+}
+
+static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
+{
+ struct inode *inode = file->f_path.dentry->d_inode;
+ struct btrfs_inode *ip = BTRFS_I(inode);
+ struct btrfs_root *root = ip->root;
+ struct btrfs_trans_handle *trans;
+ unsigned int flags, oldflags;
+ int ret;
+
+ if (copy_from_user(&flags, arg, sizeof(flags)))
+ return -EFAULT;
+
+ if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
+ FS_NOATIME_FL | FS_NODUMP_FL | \
+ FS_SYNC_FL | FS_DIRSYNC_FL))
+ return -EOPNOTSUPP;
+
+ if (!is_owner_or_cap(inode))
+ return -EACCES;
+
+ mutex_lock(&inode->i_mutex);
+
+ flags = btrfs_mask_flags(inode->i_mode, flags);
+ oldflags = btrfs_flags_to_ioctl(ip->flags);
+ if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
+ if (!capable(CAP_LINUX_IMMUTABLE)) {
+ ret = -EPERM;
+ goto out_unlock;
+ }
+ }
+
+ ret = mnt_want_write(file->f_path.mnt);
+ if (ret)
+ goto out_unlock;
+
+ if (flags & FS_SYNC_FL)
+ ip->flags |= BTRFS_INODE_SYNC;
+ else
+ ip->flags &= ~BTRFS_INODE_SYNC;
+ if (flags & FS_IMMUTABLE_FL)
+ ip->flags |= BTRFS_INODE_IMMUTABLE;
+ else
+ ip->flags &= ~BTRFS_INODE_IMMUTABLE;
+ if (flags & FS_APPEND_FL)
+ ip->flags |= BTRFS_INODE_APPEND;
+ else
+ ip->flags &= ~BTRFS_INODE_APPEND;
+ if (flags & FS_NODUMP_FL)
+ ip->flags |= BTRFS_INODE_NODUMP;
+ else
+ ip->flags &= ~BTRFS_INODE_NODUMP;
+ if (flags & FS_NOATIME_FL)
+ ip->flags |= BTRFS_INODE_NOATIME;
+ else
+ ip->flags &= ~BTRFS_INODE_NOATIME;
+ if (flags & FS_DIRSYNC_FL)
+ ip->flags |= BTRFS_INODE_DIRSYNC;
+ else
+ ip->flags &= ~BTRFS_INODE_DIRSYNC;
+ trans = btrfs_join_transaction(root, 1);
+ BUG_ON(!trans);
+
+ ret = btrfs_update_inode(trans, root, inode);
+ BUG_ON(ret);
+
+ btrfs_update_iflags(inode);
+ inode->i_ctime = CURRENT_TIME;
+ btrfs_end_transaction(trans, root);
+
+ mnt_drop_write(file->f_path.mnt);
+ out_unlock:
+ mutex_unlock(&inode->i_mutex);
+ return 0;
+}
+
+static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
+{
+ struct inode *inode = file->f_path.dentry->d_inode;
+
+ return put_user(inode->i_generation, arg);
+}
+
static noinline int create_subvol(struct btrfs_root *root,
struct dentry *dentry,
char *name, int namelen)
struct btrfs_root_item root_item;
struct btrfs_inode_item *inode_item;
struct extent_buffer *leaf;
- struct btrfs_root *new_root = root;
- struct inode *dir;
+ struct btrfs_root *new_root;
+ struct inode *dir = dentry->d_parent->d_inode;
int ret;
int err;
u64 objectid;
u64 index = 0;
unsigned long nr = 1;
- ret = btrfs_check_free_space(root, 1, 0);
+ /*
+ * 1 - inode item
+ * 2 - refs
+ * 1 - root item
+ * 2 - dir items
+ */
+ ret = btrfs_reserve_metadata_space(root, 6);
if (ret)
- goto fail_commit;
+ return ret;
trans = btrfs_start_transaction(root, 1);
BUG_ON(!trans);
if (ret)
goto fail;
- leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0,
- objectid, trans->transid, 0, 0, 0);
+ leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
+ 0, objectid, NULL, 0, 0, 0);
if (IS_ERR(leaf)) {
ret = PTR_ERR(leaf);
goto fail;
}
- btrfs_set_header_nritems(leaf, 0);
- btrfs_set_header_level(leaf, 0);
+ memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
btrfs_set_header_bytenr(leaf, leaf->start);
btrfs_set_header_generation(leaf, trans->transid);
+ btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
btrfs_set_header_owner(leaf, objectid);
write_extent_buffer(leaf, root->fs_info->fsid,
(unsigned long)btrfs_header_fsid(leaf),
BTRFS_FSID_SIZE);
+ write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
+ (unsigned long)btrfs_header_chunk_tree_uuid(leaf),
+ BTRFS_UUID_SIZE);
btrfs_mark_buffer_dirty(leaf);
inode_item = &root_item.inode;
btrfs_set_root_dirid(&root_item, new_dirid);
key.objectid = objectid;
- key.offset = 1;
+ key.offset = 0;
btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
&root_item);
if (ret)
goto fail;
+ key.offset = (u64)-1;
+ new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
+ BUG_ON(IS_ERR(new_root));
+
+ btrfs_record_root_in_trans(trans, new_root);
+
+ ret = btrfs_create_subvol_root(trans, new_root, new_dirid,
+ BTRFS_I(dir)->block_group);
/*
* insert the directory item
*/
- key.offset = (u64)-1;
- dir = dentry->d_parent->d_inode;
ret = btrfs_set_inode_index(dir, &index);
BUG_ON(ret);
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);
-
+ btrfs_i_size_write(dir, dir->i_size + namelen * 2);
+ ret = btrfs_update_inode(trans, root, dir);
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,
+ objectid, root->root_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_no_name(root->fs_info, &key);
- BUG_ON(!new_root);
-
- trans = btrfs_start_transaction(new_root, 1);
- BUG_ON(!trans);
-
- ret = btrfs_create_subvol_root(new_root, dentry, trans, new_dirid,
- BTRFS_I(dir)->block_group);
- if (ret)
- goto fail;
-
+ d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
fail:
nr = trans->blocks_used;
- err = btrfs_commit_transaction(trans, new_root);
+ err = btrfs_commit_transaction(trans, root);
if (err && !ret)
ret = err;
-fail_commit:
+
+ btrfs_unreserve_metadata_space(root, 6);
btrfs_btree_balance_dirty(root, nr);
return ret;
}
if (!root->ref_cows)
return -EINVAL;
- ret = btrfs_check_free_space(root, 1, 0);
+ /*
+ * 1 - inode item
+ * 2 - refs
+ * 1 - root item
+ * 2 - dir items
+ */
+ ret = btrfs_reserve_metadata_space(root, 6);
if (ret)
goto fail_unlock;
pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
if (!pending_snapshot) {
ret = -ENOMEM;
+ btrfs_unreserve_metadata_space(root, 6);
goto fail_unlock;
}
pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
if (!pending_snapshot->name) {
ret = -ENOMEM;
kfree(pending_snapshot);
+ btrfs_unreserve_metadata_space(root, 6);
goto fail_unlock;
}
memcpy(pending_snapshot->name, name, namelen);
* sys_mkdirat and vfs_mkdir, but we only do a single component lookup
* inside this filesystem so it's quite a bit simpler.
*/
-static noinline int btrfs_mksubvol(struct path *parent, char *name,
- int mode, int namelen,
+static noinline int btrfs_mksubvol(struct path *parent,
+ char *name, int namelen,
struct btrfs_root *snap_src)
{
+ struct inode *dir = parent->dentry->d_inode;
struct dentry *dentry;
int error;
- mutex_lock_nested(&parent->dentry->d_inode->i_mutex, I_MUTEX_PARENT);
+ mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
dentry = lookup_one_len(name, parent->dentry, namelen);
error = PTR_ERR(dentry);
if (dentry->d_inode)
goto out_dput;
- if (!IS_POSIXACL(parent->dentry->d_inode))
- mode &= ~current->fs->umask;
-
error = mnt_want_write(parent->mnt);
if (error)
goto out_dput;
- error = btrfs_may_create(parent->dentry->d_inode, dentry);
+ error = btrfs_may_create(dir, dentry);
if (error)
goto out_drop_write;
- /*
- * Actually perform the low-level subvolume creation after all
- * this VFS fuzz.
- *
- * Eventually we want to pass in an inode under which we create this
- * subvolume, but for now all are under the filesystem root.
- *
- * Also we should pass on the mode eventually to allow creating new
- * subvolume with specific mode bits.
- */
+ down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
+
+ if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
+ goto out_up_read;
+
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);
+ error = create_snapshot(snap_src, dentry,
+ name, namelen);
} else {
- error = create_subvol(BTRFS_I(parent->dentry->d_inode)->root,
- dentry, name, namelen);
+ error = create_subvol(BTRFS_I(dir)->root, dentry,
+ name, namelen);
}
- if (error)
- goto out_drop_write;
-
- fsnotify_mkdir(parent->dentry->d_inode, dentry);
+ if (!error)
+ fsnotify_mkdir(dir, dentry);
+out_up_read:
+ up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
out_drop_write:
mnt_drop_write(parent->mnt);
out_dput:
dput(dentry);
out_unlock:
- mutex_unlock(&parent->dentry->d_inode->i_mutex);
+ mutex_unlock(&dir->i_mutex);
return error;
}
-
-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;
unsigned long i;
int ret;
- ret = btrfs_check_free_space(root, inode->i_size, 0);
+ ret = btrfs_check_data_free_space(root, inode, inode->i_size);
if (ret)
return -ENOSPC;
clear_page_dirty_for_io(page);
btrfs_set_extent_delalloc(inode, page_start, page_end);
-
- unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
set_page_dirty(page);
+ unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
unlock_page(page);
page_cache_release(page);
balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
return 0;
}
-/*
- * Called inside transaction, so use GFP_NOFS
- */
-
-static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
+static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
+ void __user *arg)
{
u64 new_size;
u64 old_size;
if (root->fs_info->sb->s_flags & MS_RDONLY)
return -EROFS;
- vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
-
- if (!vol_args)
- return -ENOMEM;
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
- if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
- ret = -EFAULT;
- goto out;
- }
+ vol_args = memdup_user(arg, sizeof(*vol_args));
+ if (IS_ERR(vol_args))
+ return PTR_ERR(vol_args);
vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
namelen = strlen(vol_args->name);
*devstr = '\0';
devstr = vol_args->name;
devid = simple_strtoull(devstr, &end, 10);
- printk(KERN_INFO "resizing devid %llu\n", devid);
+ printk(KERN_INFO "resizing devid %llu\n",
+ (unsigned long long)devid);
}
device = btrfs_find_device(root, devid, NULL, NULL);
if (!device) {
- printk(KERN_INFO "resizer unable to find device %llu\n", devid);
+ printk(KERN_INFO "resizer unable to find device %llu\n",
+ (unsigned long long)devid);
ret = -EINVAL;
goto out_unlock;
}
out_unlock:
mutex_unlock(&root->fs_info->volume_mutex);
-out:
kfree(vol_args);
return ret;
}
{
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 = 0;
if (root->fs_info->sb->s_flags & MS_RDONLY)
return -EROFS;
- vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
-
- if (!vol_args)
- return -ENOMEM;
-
- if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
- ret = -EFAULT;
- goto out;
- }
+ vol_args = memdup_user(arg, sizeof(*vol_args));
+ if (IS_ERR(vol_args))
+ return PTR_ERR(vol_args);
vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
namelen = strlen(vol_args->name);
goto out;
}
- path = btrfs_alloc_path();
- if (!path) {
- ret = -ENOMEM;
- goto out;
- }
-
- root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
- di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
- path, root_dirid,
- vol_args->name, namelen, 0);
- btrfs_free_path(path);
-
- if (di && !IS_ERR(di)) {
- ret = -EEXIST;
- goto out;
- }
-
- if (IS_ERR(di)) {
- ret = PTR_ERR(di);
- goto out;
- }
-
if (subvol) {
- ret = btrfs_mksubvol(&file->f_path, vol_args->name,
- file->f_path.dentry->d_inode->i_mode,
- namelen, NULL);
+ ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen,
+ NULL);
} else {
struct inode *src_inode;
src_file = fget(vol_args->fd);
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");
+ printk(KERN_INFO "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);
+ ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen,
+ BTRFS_I(src_inode)->root);
fput(src_file);
}
-
out:
kfree(vol_args);
return ret;
}
+/*
+ * helper to check if the subvolume references other subvolumes
+ */
+static noinline int may_destroy_subvol(struct btrfs_root *root)
+{
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ int ret;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ key.objectid = root->root_key.objectid;
+ key.type = BTRFS_ROOT_REF_KEY;
+ key.offset = (u64)-1;
+
+ ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
+ &key, path, 0, 0);
+ if (ret < 0)
+ goto out;
+ BUG_ON(ret == 0);
+
+ ret = 0;
+ if (path->slots[0] > 0) {
+ path->slots[0]--;
+ btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
+ if (key.objectid == root->root_key.objectid &&
+ key.type == BTRFS_ROOT_REF_KEY)
+ ret = -ENOTEMPTY;
+ }
+out:
+ btrfs_free_path(path);
+ return ret;
+}
+
+static noinline int btrfs_ioctl_snap_destroy(struct file *file,
+ void __user *arg)
+{
+ struct dentry *parent = fdentry(file);
+ struct dentry *dentry;
+ struct inode *dir = parent->d_inode;
+ struct inode *inode;
+ struct btrfs_root *root = BTRFS_I(dir)->root;
+ struct btrfs_root *dest = NULL;
+ struct btrfs_ioctl_vol_args *vol_args;
+ struct btrfs_trans_handle *trans;
+ int namelen;
+ int ret;
+ int err = 0;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ vol_args = memdup_user(arg, sizeof(*vol_args));
+ if (IS_ERR(vol_args))
+ return PTR_ERR(vol_args);
+
+ vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
+ namelen = strlen(vol_args->name);
+ if (strchr(vol_args->name, '/') ||
+ strncmp(vol_args->name, "..", namelen) == 0) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ err = mnt_want_write(file->f_path.mnt);
+ if (err)
+ goto out;
+
+ mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
+ dentry = lookup_one_len(vol_args->name, parent, namelen);
+ if (IS_ERR(dentry)) {
+ err = PTR_ERR(dentry);
+ goto out_unlock_dir;
+ }
+
+ if (!dentry->d_inode) {
+ err = -ENOENT;
+ goto out_dput;
+ }
+
+ inode = dentry->d_inode;
+ if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) {
+ err = -EINVAL;
+ goto out_dput;
+ }
+
+ dest = BTRFS_I(inode)->root;
+
+ mutex_lock(&inode->i_mutex);
+ err = d_invalidate(dentry);
+ if (err)
+ goto out_unlock;
+
+ down_write(&root->fs_info->subvol_sem);
+
+ err = may_destroy_subvol(dest);
+ if (err)
+ goto out_up_write;
+
+ trans = btrfs_start_transaction(root, 1);
+ ret = btrfs_unlink_subvol(trans, root, dir,
+ dest->root_key.objectid,
+ dentry->d_name.name,
+ dentry->d_name.len);
+ BUG_ON(ret);
+
+ btrfs_record_root_in_trans(trans, dest);
+
+ memset(&dest->root_item.drop_progress, 0,
+ sizeof(dest->root_item.drop_progress));
+ dest->root_item.drop_level = 0;
+ btrfs_set_root_refs(&dest->root_item, 0);
+
+ ret = btrfs_insert_orphan_item(trans,
+ root->fs_info->tree_root,
+ dest->root_key.objectid);
+ BUG_ON(ret);
+
+ ret = btrfs_commit_transaction(trans, root);
+ BUG_ON(ret);
+ inode->i_flags |= S_DEAD;
+out_up_write:
+ up_write(&root->fs_info->subvol_sem);
+out_unlock:
+ mutex_unlock(&inode->i_mutex);
+ if (!err) {
+ btrfs_invalidate_inodes(dest);
+ d_delete(dentry);
+ }
+out_dput:
+ dput(dentry);
+out_unlock_dir:
+ mutex_unlock(&dir->i_mutex);
+ mnt_drop_write(file->f_path.mnt);
+out:
+ kfree(vol_args);
+ return err;
+}
+
static int btrfs_ioctl_defrag(struct file *file)
{
struct inode *inode = fdentry(file)->d_inode;
switch (inode->i_mode & S_IFMT) {
case S_IFDIR:
+ if (!capable(CAP_SYS_ADMIN)) {
+ ret = -EPERM;
+ goto out;
+ }
btrfs_defrag_root(root, 0);
btrfs_defrag_root(root->fs_info->extent_root, 0);
break;
case S_IFREG:
+ if (!(file->f_mode & FMODE_WRITE)) {
+ ret = -EINVAL;
+ goto out;
+ }
btrfs_defrag_file(file);
break;
}
-
- return 0;
+out:
+ mnt_drop_write(file->f_path.mnt);
+ return ret;
}
-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;
- vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
- if (!vol_args)
- return -ENOMEM;
+ vol_args = memdup_user(arg, sizeof(*vol_args));
+ if (IS_ERR(vol_args))
+ return PTR_ERR(vol_args);
- if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
- ret = -EFAULT;
- goto out;
- }
vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
ret = btrfs_init_new_device(root, vol_args->name);
-out:
kfree(vol_args);
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;
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
if (root->fs_info->sb->s_flags & MS_RDONLY)
return -EROFS;
- vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
+ vol_args = memdup_user(arg, sizeof(*vol_args));
+ if (IS_ERR(vol_args))
+ return PTR_ERR(vol_args);
- if (!vol_args)
- return -ENOMEM;
-
- if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
- ret = -EFAULT;
- goto out;
- }
vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
ret = btrfs_rm_device(root, vol_args->name);
-out:
kfree(vol_args);
return ret;
}
-long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off,
- u64 olen, u64 destoff)
+static noinline 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;
* they don't overlap)?
*/
+ /* the destination must be opened for writing */
+ if (!(file->f_mode & FMODE_WRITE))
+ return -EINVAL;
+
ret = mnt_want_write(file->f_path.mnt);
if (ret)
return ret;
src_file = fget(srcfd);
- if (!src_file)
- return -EBADF;
+ if (!src_file) {
+ ret = -EBADF;
+ goto out_drop_write;
+ }
src = src_file->f_dentry->d_inode;
ret = -EINVAL;
((off + len) & (bs-1)))
goto out_unlock;
- printk("final src extent is %llu~%llu\n", off, len);
- printk("final dst extent is %llu~%llu\n", destoff, len);
-
/* do any pending delalloc/csum calc on src, one way or
another, and lock file content */
while (1) {
BUG_ON(!trans);
/* punch hole in destination first */
- btrfs_drop_extents(trans, root, inode, off, off+len, 0, &hint_byte);
+ btrfs_drop_extents(trans, root, inode, off, off + len,
+ off + len, 0, &hint_byte, 1);
/* clone data */
key.objectid = src->i_ino;
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;
struct btrfs_file_extent_item);
comp = btrfs_file_extent_compression(leaf, extent);
type = btrfs_file_extent_type(leaf, extent);
- if (type == BTRFS_FILE_EXTENT_REG) {
- disko = btrfs_file_extent_disk_bytenr(leaf, extent);
- diskl = btrfs_file_extent_disk_num_bytes(leaf, extent);
+ if (type == BTRFS_FILE_EXTENT_REG ||
+ type == BTRFS_FILE_EXTENT_PREALLOC) {
+ disko = btrfs_file_extent_disk_bytenr(leaf,
+ extent);
+ diskl = btrfs_file_extent_disk_num_bytes(leaf,
+ extent);
datao = btrfs_file_extent_offset(leaf, extent);
- datal = btrfs_file_extent_num_bytes(leaf, extent);
+ datal = btrfs_file_extent_num_bytes(leaf,
+ extent);
} else if (type == BTRFS_FILE_EXTENT_INLINE) {
/* take upper bound, may be compressed */
datal = btrfs_file_extent_ram_bytes(leaf,
new_key.objectid = inode->i_ino;
new_key.offset = key.offset + destoff - off;
- if (type == BTRFS_FILE_EXTENT_REG) {
+ if (type == BTRFS_FILE_EXTENT_REG ||
+ type == BTRFS_FILE_EXTENT_PREALLOC) {
ret = btrfs_insert_empty_item(trans, root, path,
&new_key, size);
if (ret)
extent = btrfs_item_ptr(leaf, slot,
struct btrfs_file_extent_item);
- printk(" orig disk %llu~%llu data %llu~%llu\n",
- disko, diskl, datao, datal);
if (off > key.offset) {
datao += off - key.offset;
datal -= off - key.offset;
}
- if (key.offset + datao + datal + key.offset >
- off + len)
+ if (key.offset + datao + datal > off + len)
datal = off + len - key.offset - datao;
/* disko == 0 means it's a hole */
if (!disko)
datao = 0;
- printk(" final disk %llu~%llu data %llu~%llu\n",
- disko, diskl, datao, datal);
btrfs_set_file_extent_offset(leaf, extent,
datao);
if (disko) {
inode_add_bytes(inode, datal);
ret = btrfs_inc_extent_ref(trans, root,
- disko, diskl, leaf->start,
- root->root_key.objectid,
- trans->transid,
- inode->i_ino);
+ disko, diskl, 0,
+ root->root_key.objectid,
+ inode->i_ino,
+ new_key.offset - datao);
BUG_ON(ret);
}
} else if (type == BTRFS_FILE_EXTENT_INLINE) {
skip = off - key.offset;
new_key.offset += skip;
}
+
if (key.offset + datal > off+len)
trim = key.offset + datal - (off+len);
- printk("len %lld skip %lld trim %lld\n",
- datal, skip, trim);
+
if (comp && (skip || trim)) {
- printk("btrfs clone_range can't split compressed inline extents yet\n");
ret = -EINVAL;
goto out;
}
goto out;
if (skip) {
- u32 start = btrfs_file_extent_calc_inline_size(0);
+ u32 start =
+ btrfs_file_extent_calc_inline_size(0);
memmove(buf+start, buf+start+skip,
datal);
}
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:
+next:
btrfs_release_path(root, path);
key.offset++;
}
btrfs_free_path(path);
out_fput:
fput(src_file);
+out_drop_write:
+ mnt_drop_write(file->f_path.mnt);
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;
root->fs_info->open_ioctl_trans--;
mutex_unlock(&root->fs_info->trans_mutex);
+ mnt_drop_write(file->f_path.mnt);
+
out:
return ret;
}
cmd, unsigned long arg)
{
struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
+ void __user *argp = (void __user *)arg;
switch (cmd) {
+ case FS_IOC_GETFLAGS:
+ return btrfs_ioctl_getflags(file, argp);
+ case FS_IOC_SETFLAGS:
+ return btrfs_ioctl_setflags(file, argp);
+ case FS_IOC_GETVERSION:
+ return btrfs_ioctl_getversion(file, argp);
case BTRFS_IOC_SNAP_CREATE:
- return btrfs_ioctl_snap_create(file, (void __user *)arg, 0);
+ return btrfs_ioctl_snap_create(file, argp, 0);
case BTRFS_IOC_SUBVOL_CREATE:
- return btrfs_ioctl_snap_create(file, (void __user *)arg, 1);
+ return btrfs_ioctl_snap_create(file, argp, 1);
+ case BTRFS_IOC_SNAP_DESTROY:
+ return btrfs_ioctl_snap_destroy(file, argp);
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:
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff