#include <linux/buffer_head.h>
#include <linux/file.h>
#include <linux/fs.h>
+#include <linux/fsnotify.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
#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/namei.h>
#include <linux/swap.h>
#include <linux/writeback.h>
#include <linux/statfs.h>
#include <linux/compat.h>
#include <linux/bit_spinlock.h>
-#include <linux/version.h>
+#include <linux/security.h>
#include <linux/xattr.h>
#include <linux/vmalloc.h>
+#include "compat.h"
#include "ctree.h"
#include "disk-io.h"
#include "transaction.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;
-static noinline int create_subvol(struct btrfs_root *root, char *name,
- int namelen)
+ 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_trans_handle *trans;
struct btrfs_key key;
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 new_dirid = BTRFS_FIRST_FREE_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);
goto fail;
leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
- objectid, trans->transid, 0, 0,
- 0, 0);
+ 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;
inode_item->generation = cpu_to_le64(1);
inode_item->size = cpu_to_le64(3);
inode_item->nlink = cpu_to_le32(1);
- inode_item->nblocks = cpu_to_le64(1);
+ inode_item->nbytes = cpu_to_le64(root->leafsize);
inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
btrfs_set_root_bytenr(&root_item, leaf->start);
+ btrfs_set_root_generation(&root_item, trans->transid);
btrfs_set_root_level(&root_item, 0);
btrfs_set_root_refs(&root_item, 1);
btrfs_set_root_used(&root_item, 0);
+ btrfs_set_root_last_snapshot(&root_item, 0);
memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
root_item.drop_level = 0;
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 = root->fs_info->sb->s_root->d_inode;
- ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
+ 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;
+ btrfs_i_size_write(dir, dir->i_size + namelen * 2);
+ ret = btrfs_update_inode(trans, root, dir);
+ 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);
- BUG_ON(!new_root);
-
- trans = btrfs_start_transaction(new_root, 1);
- BUG_ON(!trans);
-
- ret = btrfs_create_subvol_root(new_root, trans, new_dirid,
- BTRFS_I(dir)->block_group);
- if (ret)
- goto fail;
+ ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
+ objectid, root->root_key.objectid,
+ dir->i_ino, index, name, namelen);
- /* Invalidate existing dcache entry for new subvolume. */
- btrfs_invalidate_dcache_root(root, name, namelen);
+ BUG_ON(ret);
+ 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;
}
-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 (!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 = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
+ 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);
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:
return ret;
}
-int btrfs_defrag_file(struct file *file)
+/* copy of may_create in fs/namei.c() */
+static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
+{
+ if (child->d_inode)
+ return -EEXIST;
+ if (IS_DEADDIR(dir))
+ return -ENOENT;
+ return inode_permission(dir, MAY_WRITE | MAY_EXEC);
+}
+
+/*
+ * Create a new subvolume below @parent. This is largely modeled after
+ * 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 namelen,
+ struct btrfs_root *snap_src)
+{
+ struct inode *dir = parent->dentry->d_inode;
+ struct dentry *dentry;
+ int error;
+
+ mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
+
+ dentry = lookup_one_len(name, parent->dentry, namelen);
+ error = PTR_ERR(dentry);
+ if (IS_ERR(dentry))
+ goto out_unlock;
+
+ error = -EEXIST;
+ if (dentry->d_inode)
+ goto out_dput;
+
+ error = mnt_want_write(parent->mnt);
+ if (error)
+ goto out_dput;
+
+ error = btrfs_may_create(dir, dentry);
+ if (error)
+ goto out_drop_write;
+
+ 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) {
+ error = create_snapshot(snap_src, dentry,
+ name, namelen);
+ } else {
+ error = create_subvol(BTRFS_I(dir)->root, dentry,
+ name, namelen);
+ }
+ 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(&dir->i_mutex);
+ return error;
+}
+
+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;
int namelen;
int mod = 0;
- vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
+ if (root->fs_info->sb->s_flags & MS_RDONLY)
+ return -EROFS;
- 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);
+ 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;
}
-static noinline int btrfs_ioctl_snap_create(struct btrfs_root *root,
- void __user *arg)
+static noinline int btrfs_ioctl_snap_create(struct file *file,
+ 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;
- u64 root_dirid;
+ struct file *src_file;
int namelen;
- int ret;
+ int ret = 0;
- vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
+ if (root->fs_info->sb->s_flags & MS_RDONLY)
+ return -EROFS;
- 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;
}
+ if (subvol) {
+ ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen,
+ NULL);
+ } else {
+ 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(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, 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) {
- ret = -ENOMEM;
+ 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);
- 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);
+ 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 (di && !IS_ERR(di)) {
- ret = -EEXIST;
+ 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;
}
- if (IS_ERR(di)) {
- ret = PTR_ERR(di);
+ 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;
}
- mutex_lock(&root->fs_info->drop_mutex);
- if (root == root->fs_info->tree_root)
- ret = create_subvol(root, vol_args->name, namelen);
- else
- ret = create_snapshot(root, vol_args->name, namelen);
- mutex_unlock(&root->fs_info->drop_mutex);
+ 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) {
+ shrink_dcache_sb(root->fs_info->sb);
+ 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 ret;
+ return err;
}
static int btrfs_ioctl_defrag(struct file *file)
{
struct inode *inode = fdentry(file)->d_inode;
struct btrfs_root *root = BTRFS_I(inode)->root;
+ int ret;
+
+ ret = mnt_want_write(file->f_path.mnt);
+ if (ret)
+ return ret;
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;
- vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (root->fs_info->sb->s_flags & MS_RDONLY)
+ return -EROFS;
- 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_rm_device(root, vol_args->name);
-out:
kfree(vol_args);
return ret;
}
-long btrfs_ioctl_clone(struct file *file, unsigned long src_fd)
+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;
struct file *src_file;
struct inode *src;
struct btrfs_trans_handle *trans;
- struct btrfs_ordered_extent *ordered;
struct btrfs_path *path;
struct extent_buffer *leaf;
char *buf;
struct btrfs_key key;
- struct btrfs_key new_key;
- u32 size;
u32 nritems;
int slot;
int ret;
+ u64 len = olen;
+ u64 bs = root->fs_info->sb->s_blocksize;
+ u64 hint_byte;
+
+ /*
+ * TODO:
+ * - split compressed inline extents. annoying: we need to
+ * decompress into destination's address_space (the file offset
+ * may change, so source mapping won't do), then recompress (or
+ * otherwise reinsert) a subrange.
+ * - allow ranges within the same file to be cloned (provided
+ * 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(src_fd);
- if (!src_file)
- return -EBADF;
+ src_file = fget(srcfd);
+ if (!src_file) {
+ ret = -EBADF;
+ goto out_drop_write;
+ }
src = src_file->f_dentry->d_inode;
+ ret = -EINVAL;
+ if (src == inode)
+ goto out_fput;
+
ret = -EISDIR;
if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
goto out_fput;
mutex_lock(&inode->i_mutex);
}
- ret = -ENOTEMPTY;
- if (inode->i_size)
+ /* determine range to clone */
+ ret = -EINVAL;
+ if (off >= src->i_size || off + len > src->i_size)
+ goto out_unlock;
+ if (len == 0)
+ olen = len = src->i_size - off;
+ /* if we extend to eof, continue to block boundary */
+ if (off + len == src->i_size)
+ len = ((src->i_size + bs-1) & ~(bs-1))
+ - off;
+
+ /* verify the end result is block aligned */
+ if ((off & (bs-1)) ||
+ ((off + len) & (bs-1)))
goto out_unlock;
/* do any pending delalloc/csum calc on src, one way or
another, and lock file content */
while (1) {
- lock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
- ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1);
+ struct btrfs_ordered_extent *ordered;
+ lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
+ ordered = btrfs_lookup_first_ordered_extent(inode, off+len);
if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered)
break;
- unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
+ unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
if (ordered)
btrfs_put_ordered_extent(ordered);
- btrfs_wait_ordered_range(src, 0, (u64)-1);
+ btrfs_wait_ordered_range(src, off, off+len);
}
trans = btrfs_start_transaction(root, 1);
BUG_ON(!trans);
+ /* punch hole in destination first */
+ btrfs_drop_extents(trans, root, inode, off, off + len,
+ off + len, 0, &hint_byte, 1);
+
+ /* clone data */
key.objectid = src->i_ino;
key.type = BTRFS_EXTENT_DATA_KEY;
key.offset = 0;
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;
if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
struct btrfs_file_extent_item *extent;
- int found_type;
+ int type;
+ u32 size;
+ struct btrfs_key new_key;
+ u64 disko = 0, diskl = 0;
+ u64 datao = 0, datal = 0;
+ u8 comp;
- extent = btrfs_item_ptr(leaf, slot,
- struct btrfs_file_extent_item);
- found_type = btrfs_file_extent_type(leaf, extent);
- if (found_type == BTRFS_FILE_EXTENT_REG) {
- u64 ds = btrfs_file_extent_disk_bytenr(leaf,
- extent);
- u64 dl = btrfs_file_extent_disk_num_bytes(leaf,
- extent);
- /* ds == 0 means there's a hole */
- if (ds != 0) {
- ret = btrfs_inc_extent_ref(trans, root,
- ds, dl,
- root->root_key.objectid,
- trans->transid,
- inode->i_ino, key.offset);
- if (ret)
- goto out;
- }
- }
- }
-
- if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY ||
- btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) {
size = btrfs_item_size_nr(leaf, slot);
read_extent_buffer(leaf, buf,
btrfs_item_ptr_offset(leaf, slot),
size);
+
+ extent = btrfs_item_ptr(leaf, slot,
+ 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 ||
+ 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);
+ } else if (type == BTRFS_FILE_EXTENT_INLINE) {
+ /* take upper bound, may be compressed */
+ datal = btrfs_file_extent_ram_bytes(leaf,
+ extent);
+ }
btrfs_release_path(root, path);
+
+ if (key.offset + datal < off ||
+ key.offset >= off+len)
+ goto next;
+
memcpy(&new_key, &key, sizeof(new_key));
new_key.objectid = inode->i_ino;
- ret = btrfs_insert_item(trans, root, &new_key,
- buf, size);
- BUG_ON(ret);
- } else {
- btrfs_release_path(root, path);
+ new_key.offset = key.offset + destoff - off;
+
+ if (type == BTRFS_FILE_EXTENT_REG ||
+ type == BTRFS_FILE_EXTENT_PREALLOC) {
+ ret = btrfs_insert_empty_item(trans, root, path,
+ &new_key, size);
+ if (ret)
+ goto out;
+
+ leaf = path->nodes[0];
+ slot = path->slots[0];
+ write_extent_buffer(leaf, buf,
+ btrfs_item_ptr_offset(leaf, slot),
+ size);
+
+ extent = btrfs_item_ptr(leaf, slot,
+ struct btrfs_file_extent_item);
+
+ if (off > key.offset) {
+ datao += off - key.offset;
+ datal -= off - key.offset;
+ }
+
+ if (key.offset + datal > off + len)
+ datal = off + len - key.offset;
+
+ /* disko == 0 means it's a hole */
+ if (!disko)
+ datao = 0;
+
+ btrfs_set_file_extent_offset(leaf, extent,
+ datao);
+ btrfs_set_file_extent_num_bytes(leaf, extent,
+ datal);
+ if (disko) {
+ inode_add_bytes(inode, datal);
+ ret = btrfs_inc_extent_ref(trans, root,
+ disko, diskl, 0,
+ root->root_key.objectid,
+ inode->i_ino,
+ new_key.offset - datao);
+ BUG_ON(ret);
+ }
+ } else if (type == BTRFS_FILE_EXTENT_INLINE) {
+ u64 skip = 0;
+ u64 trim = 0;
+ if (off > key.offset) {
+ skip = off - key.offset;
+ new_key.offset += skip;
+ }
+
+ if (key.offset + datal > off+len)
+ trim = key.offset + datal - (off+len);
+
+ if (comp && (skip || trim)) {
+ ret = -EINVAL;
+ goto out;
+ }
+ size -= skip + trim;
+ datal -= skip + trim;
+ ret = btrfs_insert_empty_item(trans, root, path,
+ &new_key, size);
+ if (ret)
+ goto out;
+
+ if (skip) {
+ u32 start =
+ btrfs_file_extent_calc_inline_size(0);
+ memmove(buf+start, buf+start+skip,
+ datal);
+ }
+
+ leaf = path->nodes[0];
+ slot = path->slots[0];
+ write_extent_buffer(leaf, buf,
+ btrfs_item_ptr_offset(leaf, slot),
+ size);
+ inode_add_bytes(inode, datal);
+ }
+
+ btrfs_mark_buffer_dirty(leaf);
}
+
+next:
+ btrfs_release_path(root, path);
key.offset++;
}
ret = 0;
btrfs_release_path(root, path);
if (ret == 0) {
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
- inode->i_blocks = src->i_blocks;
- btrfs_i_size_write(inode, src->i_size);
+ if (destoff + olen > inode->i_size)
+ btrfs_i_size_write(inode, destoff + olen);
BTRFS_I(inode)->flags = BTRFS_I(src)->flags;
ret = btrfs_update_inode(trans, root, inode);
}
btrfs_end_transaction(trans, root);
- unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
+ unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
if (ret)
vmtruncate(inode, 0);
out_unlock:
btrfs_free_path(path);
out_fput:
fput(src_file);
+out_drop_write:
+ mnt_drop_write(file->f_path.mnt);
return ret;
}
+static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
+{
+ struct btrfs_ioctl_clone_range_args 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);
+}
+
/*
* there are many ways the trans_start and trans_end ioctls can lead
* to deadlocks. They should only be used by applications that
* 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;
struct btrfs_trans_handle *trans;
- int ret = 0;
+ int ret;
+ ret = -EPERM;
if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
+ goto out;
- if (file->private_data) {
- ret = -EINPROGRESS;
+ ret = -EINPROGRESS;
+ if (file->private_data)
+ goto out;
+
+ ret = mnt_want_write(file->f_path.mnt);
+ if (ret)
goto out;
- }
mutex_lock(&root->fs_info->trans_mutex);
root->fs_info->open_ioctl_trans++;
mutex_unlock(&root->fs_info->trans_mutex);
+ ret = -ENOMEM;
trans = btrfs_start_ioctl_transaction(root, 0);
- if (trans)
- file->private_data = trans;
- else
- ret = -ENOMEM;
- /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/
+ if (!trans)
+ goto out_drop;
+
+ file->private_data = trans;
+ return 0;
+
+out_drop:
+ mutex_lock(&root->fs_info->trans_mutex);
+ root->fs_info->open_ioctl_trans--;
+ mutex_unlock(&root->fs_info->trans_mutex);
+ mnt_drop_write(file->f_path.mnt);
out:
return ret;
}
struct inode *inode = fdentry(file)->d_inode;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans;
- int ret = 0;
trans = file->private_data;
- if (!trans) {
- ret = -EINVAL;
- goto out;
- }
- btrfs_end_transaction(trans, root);
+ if (!trans)
+ return -EINVAL;
file->private_data = NULL;
+ btrfs_end_transaction(trans, root);
+
mutex_lock(&root->fs_info->trans_mutex);
root->fs_info->open_ioctl_trans--;
mutex_unlock(&root->fs_info->trans_mutex);
-out:
- return ret;
+ mnt_drop_write(file->f_path.mnt);
+ return 0;
}
long btrfs_ioctl(struct file *file, unsigned int
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(root, (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_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);
+ return btrfs_ioctl_clone(file, arg, 0, 0, 0);
+ case BTRFS_IOC_CLONE_RANGE:
+ 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;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff