| /* |
| * Copyright (C) 2007 Oracle. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public |
| * License v2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public |
| * License along with this program; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 021110-1307, USA. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/bio.h> |
| #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/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/security.h> |
| #include <linux/xattr.h> |
| #include <linux/vmalloc.h> |
| #include <linux/slab.h> |
| #include "compat.h" |
| #include "ctree.h" |
| #include "disk-io.h" |
| #include "transaction.h" |
| #include "btrfs_inode.h" |
| #include "ioctl.h" |
| #include "print-tree.h" |
| #include "volumes.h" |
| #include "locking.h" |
| #include "ctree.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_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; |
| struct inode *dir = dentry->d_parent->d_inode; |
| int ret; |
| int err; |
| u64 objectid; |
| u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; |
| u64 index = 0; |
| |
| /* |
| * 1 - inode item |
| * 2 - refs |
| * 1 - root item |
| * 2 - dir items |
| */ |
| ret = btrfs_reserve_metadata_space(root, 6); |
| if (ret) |
| return ret; |
| |
| trans = btrfs_start_transaction(root, 1); |
| BUG_ON(!trans); |
| |
| ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
| 0, &objectid); |
| if (ret) |
| goto fail; |
| |
| 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; |
| } |
| |
| 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; |
| memset(inode_item, 0, sizeof(*inode_item)); |
| inode_item->generation = cpu_to_le64(1); |
| inode_item->size = cpu_to_le64(3); |
| inode_item->nlink = cpu_to_le32(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, leaf->len); |
| 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_tree_unlock(leaf); |
| free_extent_buffer(leaf); |
| leaf = NULL; |
| |
| btrfs_set_root_dirid(&root_item, new_dirid); |
| |
| key.objectid = objectid; |
| 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 |
| */ |
| 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, index); |
| 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_add_root_ref(trans, root->fs_info->tree_root, |
| objectid, root->root_key.objectid, |
| dir->i_ino, index, name, namelen); |
| |
| BUG_ON(ret); |
| |
| d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); |
| fail: |
| err = btrfs_commit_transaction(trans, root); |
| if (err && !ret) |
| ret = err; |
| |
| btrfs_unreserve_metadata_space(root, 6); |
| return ret; |
| } |
| |
| static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, |
| char *name, int namelen) |
| { |
| struct inode *inode; |
| struct btrfs_pending_snapshot *pending_snapshot; |
| struct btrfs_trans_handle *trans; |
| int ret; |
| |
| if (!root->ref_cows) |
| return -EINVAL; |
| |
| /* |
| * 1 - inode item |
| * 2 - refs |
| * 1 - root item |
| * 2 - dir items |
| */ |
| ret = btrfs_reserve_metadata_space(root, 6); |
| if (ret) |
| goto fail; |
| |
| pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
| if (!pending_snapshot) { |
| ret = -ENOMEM; |
| btrfs_unreserve_metadata_space(root, 6); |
| goto fail; |
| } |
| 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; |
| } |
| 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_commit_transaction(trans, root); |
| BUG_ON(ret); |
| btrfs_unreserve_metadata_space(root, 6); |
| |
| inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); |
| if (IS_ERR(inode)) { |
| ret = PTR_ERR(inode); |
| goto fail; |
| } |
| BUG_ON(!inode); |
| d_instantiate(dentry, inode); |
| ret = 0; |
| fail: |
| return ret; |
| } |
| |
| /* 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 should_defrag_range(struct inode *inode, u64 start, u64 len, |
| int thresh, u64 *last_len, u64 *skip, |
| u64 *defrag_end) |
| { |
| struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
| struct extent_map *em = NULL; |
| struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
| int ret = 1; |
| |
| |
| if (thresh == 0) |
| thresh = 256 * 1024; |
| |
| /* |
| * make sure that once we start defragging and extent, we keep on |
| * defragging it |
| */ |
| if (start < *defrag_end) |
| return 1; |
| |
| *skip = 0; |
| |
| /* |
| * hopefully we have this extent in the tree already, try without |
| * the full extent lock |
| */ |
| read_lock(&em_tree->lock); |
| em = lookup_extent_mapping(em_tree, start, len); |
| read_unlock(&em_tree->lock); |
| |
| if (!em) { |
| /* get the big lock and read metadata off disk */ |
| lock_extent(io_tree, start, start + len - 1, GFP_NOFS); |
| em = btrfs_get_extent(inode, NULL, 0, start, len, 0); |
| unlock_extent(io_tree, start, start + len - 1, GFP_NOFS); |
| |
| if (!em) |
| return 0; |
| } |
| |
| /* this will cover holes, and inline extents */ |
| if (em->block_start >= EXTENT_MAP_LAST_BYTE) |
| ret = 0; |
| |
| /* |
| * we hit a real extent, if it is big don't bother defragging it again |
| */ |
| if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh) |
| ret = 0; |
| |
| /* |
| * last_len ends up being a counter of how many bytes we've defragged. |
| * every time we choose not to defrag an extent, we reset *last_len |
| * so that the next tiny extent will force a defrag. |
| * |
| * The end result of this is that tiny extents before a single big |
| * extent will force at least part of that big extent to be defragged. |
| */ |
| if (ret) { |
| *last_len += len; |
| *defrag_end = extent_map_end(em); |
| } else { |
| *last_len = 0; |
| *skip = extent_map_end(em); |
| *defrag_end = 0; |
| } |
| |
| free_extent_map(em); |
| return ret; |
| } |
| |
| static int btrfs_defrag_file(struct file *file, |
| struct btrfs_ioctl_defrag_range_args *range) |
| { |
| struct inode *inode = fdentry(file)->d_inode; |
| struct btrfs_root *root = BTRFS_I(inode)->root; |
| struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
| struct btrfs_ordered_extent *ordered; |
| struct page *page; |
| unsigned long last_index; |
| unsigned long ra_pages = root->fs_info->bdi.ra_pages; |
| unsigned long total_read = 0; |
| u64 page_start; |
| u64 page_end; |
| u64 last_len = 0; |
| u64 skip = 0; |
| u64 defrag_end = 0; |
| unsigned long i; |
| int ret; |
| |
| if (inode->i_size == 0) |
| return 0; |
| |
| if (range->start + range->len > range->start) { |
| last_index = min_t(u64, inode->i_size - 1, |
| range->start + range->len - 1) >> PAGE_CACHE_SHIFT; |
| } else { |
| last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; |
| } |
| |
| i = range->start >> PAGE_CACHE_SHIFT; |
| while (i <= last_index) { |
| if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, |
| PAGE_CACHE_SIZE, |
| range->extent_thresh, |
| &last_len, &skip, |
| &defrag_end)) { |
| unsigned long next; |
| /* |
| * the should_defrag function tells us how much to skip |
| * bump our counter by the suggested amount |
| */ |
| next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; |
| i = max(i + 1, next); |
| continue; |
| } |
| |
| if (total_read % ra_pages == 0) { |
| btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, |
| min(last_index, i + ra_pages - 1)); |
| } |
| total_read++; |
| mutex_lock(&inode->i_mutex); |
| if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) |
| BTRFS_I(inode)->force_compress = 1; |
| |
| ret = btrfs_check_data_free_space(root, inode, PAGE_CACHE_SIZE); |
| if (ret) { |
| ret = -ENOSPC; |
| break; |
| } |
| |
| ret = btrfs_reserve_metadata_for_delalloc(root, inode, 1); |
| if (ret) { |
| btrfs_free_reserved_data_space(root, inode, |
| PAGE_CACHE_SIZE); |
| ret = -ENOSPC; |
| break; |
| } |
| again: |
| if (inode->i_size == 0 || |
| i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) { |
| ret = 0; |
| goto err_reservations; |
| } |
| |
| page = grab_cache_page(inode->i_mapping, i); |
| if (!page) |
| goto err_reservations; |
| |
| if (!PageUptodate(page)) { |
| btrfs_readpage(NULL, page); |
| lock_page(page); |
| if (!PageUptodate(page)) { |
| unlock_page(page); |
| page_cache_release(page); |
| goto err_reservations; |
| } |
| } |
| |
| if (page->mapping != inode->i_mapping) { |
| unlock_page(page); |
| page_cache_release(page); |
| goto again; |
| } |
| |
| wait_on_page_writeback(page); |
| |
| if (PageDirty(page)) { |
| btrfs_free_reserved_data_space(root, inode, |
| PAGE_CACHE_SIZE); |
| goto loop_unlock; |
| } |
| |
| page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
| page_end = page_start + PAGE_CACHE_SIZE - 1; |
| lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
| |
| ordered = btrfs_lookup_ordered_extent(inode, page_start); |
| if (ordered) { |
| unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
| unlock_page(page); |
| page_cache_release(page); |
| btrfs_start_ordered_extent(inode, ordered, 1); |
| btrfs_put_ordered_extent(ordered); |
| goto again; |
| } |
| set_page_extent_mapped(page); |
| |
| /* |
| * this makes sure page_mkwrite is called on the |
| * page if it is dirtied again later |
| */ |
| clear_page_dirty_for_io(page); |
| clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, |
| page_end, EXTENT_DIRTY | EXTENT_DELALLOC | |
| EXTENT_DO_ACCOUNTING, GFP_NOFS); |
| |
| btrfs_set_extent_delalloc(inode, page_start, page_end, NULL); |
| ClearPageChecked(page); |
| set_page_dirty(page); |
| unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
| |
| loop_unlock: |
| unlock_page(page); |
| page_cache_release(page); |
| mutex_unlock(&inode->i_mutex); |
| |
| btrfs_unreserve_metadata_for_delalloc(root, inode, 1); |
| balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); |
| i++; |
| } |
| |
| if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) |
| filemap_flush(inode->i_mapping); |
| |
| if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { |
| /* the filemap_flush will queue IO into the worker threads, but |
| * we have to make sure the IO is actually started and that |
| * ordered extents get created before we return |
| */ |
| atomic_inc(&root->fs_info->async_submit_draining); |
| while (atomic_read(&root->fs_info->nr_async_submits) || |
| atomic_read(&root->fs_info->async_delalloc_pages)) { |
| wait_event(root->fs_info->async_submit_wait, |
| (atomic_read(&root->fs_info->nr_async_submits) == 0 && |
| atomic_read(&root->fs_info->async_delalloc_pages) == 0)); |
| } |
| atomic_dec(&root->fs_info->async_submit_draining); |
| |
| mutex_lock(&inode->i_mutex); |
| BTRFS_I(inode)->force_compress = 0; |
| mutex_unlock(&inode->i_mutex); |
| } |
| |
| return 0; |
| |
| err_reservations: |
| mutex_unlock(&inode->i_mutex); |
| btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE); |
| btrfs_unreserve_metadata_for_delalloc(root, inode, 1); |
| return ret; |
| } |
| |
| static noinline int btrfs_ioctl_resize(struct btrfs_root *root, |
| void __user *arg) |
| { |
| u64 new_size; |
| u64 old_size; |
| u64 devid = 1; |
| struct btrfs_ioctl_vol_args *vol_args; |
| struct btrfs_trans_handle *trans; |
| struct btrfs_device *device = NULL; |
| char *sizestr; |
| char *devstr = NULL; |
| int ret = 0; |
| int namelen; |
| int mod = 0; |
| |
| if (root->fs_info->sb->s_flags & MS_RDONLY) |
| return -EROFS; |
| |
| 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); |
| |
| mutex_lock(&root->fs_info->volume_mutex); |
| sizestr = vol_args->name; |
| devstr = strchr(sizestr, ':'); |
| if (devstr) { |
| char *end; |
| sizestr = devstr + 1; |
| *devstr = '\0'; |
| devstr = vol_args->name; |
| devid = simple_strtoull(devstr, &end, 10); |
| 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", |
| (unsigned long long)devid); |
| ret = -EINVAL; |
| goto out_unlock; |
| } |
| if (!strcmp(sizestr, "max")) |
| new_size = device->bdev->bd_inode->i_size; |
| else { |
| if (sizestr[0] == '-') { |
| mod = -1; |
| sizestr++; |
| } else if (sizestr[0] == '+') { |
| mod = 1; |
| sizestr++; |
| } |
| new_size = memparse(sizestr, NULL); |
| if (new_size == 0) { |
| ret = -EINVAL; |
| goto out_unlock; |
| } |
| } |
| |
| old_size = device->total_bytes; |
| |
| if (mod < 0) { |
| if (new_size > old_size) { |
| ret = -EINVAL; |
| goto out_unlock; |
| } |
| new_size = old_size - new_size; |
| } else if (mod > 0) { |
| new_size = old_size + new_size; |
| } |
| |
| if (new_size < 256 * 1024 * 1024) { |
| ret = -EINVAL; |
| goto out_unlock; |
| } |
| if (new_size > device->bdev->bd_inode->i_size) { |
| ret = -EFBIG; |
| goto out_unlock; |
| } |
| |
| do_div(new_size, root->sectorsize); |
| new_size *= root->sectorsize; |
| |
| printk(KERN_INFO "new size for %s is %llu\n", |
| device->name, (unsigned long long)new_size); |
| |
| if (new_size > old_size) { |
| trans = btrfs_start_transaction(root, 1); |
| ret = btrfs_grow_device(trans, device, new_size); |
| btrfs_commit_transaction(trans, root); |
| } else { |
| ret = btrfs_shrink_device(device, new_size); |
| } |
| |
| out_unlock: |
| mutex_unlock(&root->fs_info->volume_mutex); |
| kfree(vol_args); |
| return ret; |
| } |
| |
| 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 file *src_file; |
| int namelen; |
| int ret = 0; |
| |
| if (root->fs_info->sb->s_flags & MS_RDONLY) |
| return -EROFS; |
| |
| 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, '/')) { |
| ret = -EINVAL; |
| 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) |
| 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 key_in_sk(struct btrfs_key *key, |
| struct btrfs_ioctl_search_key *sk) |
| { |
| struct btrfs_key test; |
| int ret; |
| |
| test.objectid = sk->min_objectid; |
| test.type = sk->min_type; |
| test.offset = sk->min_offset; |
| |
| ret = btrfs_comp_cpu_keys(key, &test); |
| if (ret < 0) |
| return 0; |
| |
| test.objectid = sk->max_objectid; |
| test.type = sk->max_type; |
| test.offset = sk->max_offset; |
| |
| ret = btrfs_comp_cpu_keys(key, &test); |
| if (ret > 0) |
| return 0; |
| return 1; |
| } |
| |
| static noinline int copy_to_sk(struct btrfs_root *root, |
| struct btrfs_path *path, |
| struct btrfs_key *key, |
| struct btrfs_ioctl_search_key *sk, |
| char *buf, |
| unsigned long *sk_offset, |
| int *num_found) |
| { |
| u64 found_transid; |
| struct extent_buffer *leaf; |
| struct btrfs_ioctl_search_header sh; |
| unsigned long item_off; |
| unsigned long item_len; |
| int nritems; |
| int i; |
| int slot; |
| int found = 0; |
| int ret = 0; |
| |
| leaf = path->nodes[0]; |
| slot = path->slots[0]; |
| nritems = btrfs_header_nritems(leaf); |
| |
| if (btrfs_header_generation(leaf) > sk->max_transid) { |
| i = nritems; |
| goto advance_key; |
| } |
| found_transid = btrfs_header_generation(leaf); |
| |
| for (i = slot; i < nritems; i++) { |
| item_off = btrfs_item_ptr_offset(leaf, i); |
| item_len = btrfs_item_size_nr(leaf, i); |
| |
| if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) |
| item_len = 0; |
| |
| if (sizeof(sh) + item_len + *sk_offset > |
| BTRFS_SEARCH_ARGS_BUFSIZE) { |
| ret = 1; |
| goto overflow; |
| } |
| |
| btrfs_item_key_to_cpu(leaf, key, i); |
| if (!key_in_sk(key, sk)) |
| continue; |
| |
| sh.objectid = key->objectid; |
| sh.offset = key->offset; |
| sh.type = key->type; |
| sh.len = item_len; |
| sh.transid = found_transid; |
| |
| /* copy search result header */ |
| memcpy(buf + *sk_offset, &sh, sizeof(sh)); |
| *sk_offset += sizeof(sh); |
| |
| if (item_len) { |
| char *p = buf + *sk_offset; |
| /* copy the item */ |
| read_extent_buffer(leaf, p, |
| item_off, item_len); |
| *sk_offset += item_len; |
| } |
| found++; |
| |
| if (*num_found >= sk->nr_items) |
| break; |
| } |
| advance_key: |
| ret = 0; |
| if (key->offset < (u64)-1 && key->offset < sk->max_offset) |
| key->offset++; |
| else if (key->type < (u8)-1 && key->type < sk->max_type) { |
| key->offset = 0; |
| key->type++; |
| } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { |
| key->offset = 0; |
| key->type = 0; |
| key->objectid++; |
| } else |
| ret = 1; |
| overflow: |
| *num_found += found; |
| return ret; |
| } |
| |
| static noinline int search_ioctl(struct inode *inode, |
| struct btrfs_ioctl_search_args *args) |
| { |
| struct btrfs_root *root; |
| struct btrfs_key key; |
| struct btrfs_key max_key; |
| struct btrfs_path *path; |
| struct btrfs_ioctl_search_key *sk = &args->key; |
| struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; |
| int ret; |
| int num_found = 0; |
| unsigned long sk_offset = 0; |
| |
| path = btrfs_alloc_path(); |
| if (!path) |
| return -ENOMEM; |
| |
| if (sk->tree_id == 0) { |
| /* search the root of the inode that was passed */ |
| root = BTRFS_I(inode)->root; |
| } else { |
| key.objectid = sk->tree_id; |
| key.type = BTRFS_ROOT_ITEM_KEY; |
| key.offset = (u64)-1; |
| root = btrfs_read_fs_root_no_name(info, &key); |
| if (IS_ERR(root)) { |
| printk(KERN_ERR "could not find root %llu\n", |
| sk->tree_id); |
| btrfs_free_path(path); |
| return -ENOENT; |
| } |
| } |
| |
| key.objectid = sk->min_objectid; |
| key.type = sk->min_type; |
| key.offset = sk->min_offset; |
| |
| max_key.objectid = sk->max_objectid; |
| max_key.type = sk->max_type; |
| max_key.offset = sk->max_offset; |
| |
| path->keep_locks = 1; |
| |
| while(1) { |
| ret = btrfs_search_forward(root, &key, &max_key, path, 0, |
| sk->min_transid); |
| if (ret != 0) { |
| if (ret > 0) |
| ret = 0; |
| goto err; |
| } |
| ret = copy_to_sk(root, path, &key, sk, args->buf, |
| &sk_offset, &num_found); |
| btrfs_release_path(root, path); |
| if (ret || num_found >= sk->nr_items) |
| break; |
| |
| } |
| ret = 0; |
| err: |
| sk->nr_items = num_found; |
| btrfs_free_path(path); |
| return ret; |
| } |
| |
| static noinline int btrfs_ioctl_tree_search(struct file *file, |
| void __user *argp) |
| { |
| struct btrfs_ioctl_search_args *args; |
| struct inode *inode; |
| int ret; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| |
| args = kmalloc(sizeof(*args), GFP_KERNEL); |
| if (!args) |
| return -ENOMEM; |
| |
| if (copy_from_user(args, argp, sizeof(*args))) { |
| kfree(args); |
| return -EFAULT; |
| } |
| inode = fdentry(file)->d_inode; |
| ret = search_ioctl(inode, args); |
| if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) |
| ret = -EFAULT; |
| kfree(args); |
| return ret; |
| } |
| |
| /* |
| * Search INODE_REFs to identify path name of 'dirid' directory |
| * in a 'tree_id' tree. and sets path name to 'name'. |
| */ |
| static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
| u64 tree_id, u64 dirid, char *name) |
| { |
| struct btrfs_root *root; |
| struct btrfs_key key; |
| char *ptr; |
| int ret = -1; |
| int slot; |
| int len; |
| int total_len = 0; |
| struct btrfs_inode_ref *iref; |
| struct extent_buffer *l; |
| struct btrfs_path *path; |
| |
| if (dirid == BTRFS_FIRST_FREE_OBJECTID) { |
| name[0]='\0'; |
| return 0; |
| } |
| |
| path = btrfs_alloc_path(); |
| if (!path) |
| return -ENOMEM; |
| |
| ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; |
| |
| key.objectid = tree_id; |
| key.type = BTRFS_ROOT_ITEM_KEY; |
| key.offset = (u64)-1; |
| root = btrfs_read_fs_root_no_name(info, &key); |
| if (IS_ERR(root)) { |
| printk(KERN_ERR "could not find root %llu\n", tree_id); |
| ret = -ENOENT; |
| goto out; |
| } |
| |
| key.objectid = dirid; |
| key.type = BTRFS_INODE_REF_KEY; |
| key.offset = (u64)-1; |
| |
| while(1) { |
| ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| if (ret < 0) |
| goto out; |
| |
| l = path->nodes[0]; |
| slot = path->slots[0]; |
| if (ret > 0 && slot > 0) |
| slot--; |
| btrfs_item_key_to_cpu(l, &key, slot); |
| |
| if (ret > 0 && (key.objectid != dirid || |
| key.type != BTRFS_INODE_REF_KEY)) { |
| ret = -ENOENT; |
| goto out; |
| } |
| |
| iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); |
| len = btrfs_inode_ref_name_len(l, iref); |
| ptr -= len + 1; |
| total_len += len + 1; |
| if (ptr < name) |
| goto out; |
| |
| *(ptr + len) = '/'; |
| read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); |
| |
| if (key.offset == BTRFS_FIRST_FREE_OBJECTID) |
| break; |
| |
| btrfs_release_path(root, path); |
| key.objectid = key.offset; |
| key.offset = (u64)-1; |
| dirid = key.objectid; |
| |
| } |
| if (ptr < name) |
| goto out; |
| memcpy(name, ptr, total_len); |
| name[total_len]='\0'; |
| ret = 0; |
| out: |
| btrfs_free_path(path); |
| return ret; |
| } |
| |
| static noinline int btrfs_ioctl_ino_lookup(struct file *file, |
| void __user *argp) |
| { |
| struct btrfs_ioctl_ino_lookup_args *args; |
| struct inode *inode; |
| int ret; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| |
| args = kmalloc(sizeof(*args), GFP_KERNEL); |
| if (copy_from_user(args, argp, sizeof(*args))) { |
| kfree(args); |
| return -EFAULT; |
| } |
| inode = fdentry(file)->d_inode; |
| |
| if (args->treeid == 0) |
| args->treeid = BTRFS_I(inode)->root->root_key.objectid; |
| |
| ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, |
| args->treeid, args->objectid, |
| args->name); |
| |
| if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) |
| ret = -EFAULT; |
| |
| kfree(args); |
| 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) { |
| 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 err; |
| } |
| |
| static int btrfs_ioctl_defrag(struct file *file, void __user *argp) |
| { |
| struct inode *inode = fdentry(file)->d_inode; |
| struct btrfs_root *root = BTRFS_I(inode)->root; |
| struct btrfs_ioctl_defrag_range_args *range; |
| 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; |
| } |
| |
| range = kzalloc(sizeof(*range), GFP_KERNEL); |
| if (!range) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| if (argp) { |
| if (copy_from_user(range, argp, |
| sizeof(*range))) { |
| ret = -EFAULT; |
| kfree(range); |
| } |
| /* compression requires us to start the IO */ |
| if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { |
| range->flags |= BTRFS_DEFRAG_RANGE_START_IO; |
| range->extent_thresh = (u32)-1; |
| } |
| } else { |
| /* the rest are all set to zero by kzalloc */ |
| range->len = (u64)-1; |
| } |
| btrfs_defrag_file(file, range); |
| kfree(range); |
| break; |
| } |
| out: |
| mnt_drop_write(file->f_path.mnt); |
| return ret; |
| } |
| |
| static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
| { |
| struct btrfs_ioctl_vol_args *vol_args; |
| int ret; |
| |
| 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'; |
| ret = btrfs_init_new_device(root, vol_args->name); |
| |
| kfree(vol_args); |
| return ret; |
| } |
| |
| 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 = memdup_user(arg, sizeof(*vol_args)); |
| if (IS_ERR(vol_args)) |
| return PTR_ERR(vol_args); |
| |
| vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
| ret = btrfs_rm_device(root, vol_args->name); |
| |
| kfree(vol_args); |
| return ret; |
| } |
| |
| 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_path *path; |
| struct extent_buffer *leaf; |
| char *buf; |
| struct btrfs_key key; |
| 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(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; |
| |
| ret = -EXDEV; |
| if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) |
| goto out_fput; |
| |
| ret = -ENOMEM; |
| buf = vmalloc(btrfs_level_size(root, 0)); |
| if (!buf) |
| goto out_fput; |
| |
| path = btrfs_alloc_path(); |
| if (!path) { |
| vfree(buf); |
| goto out_fput; |
| } |
| path->reada = 2; |
| |
| if (inode < src) { |
| mutex_lock(&inode->i_mutex); |
| mutex_lock(&src->i_mutex); |
| } else { |
| mutex_lock(&src->i_mutex); |
| mutex_lock(&inode->i_mutex); |
| } |
| |
| /* 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) { |
| 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, off, off+len, GFP_NOFS); |
| if (ordered) |
| btrfs_put_ordered_extent(ordered); |
| 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, inode, off, off + len, &hint_byte, 1); |
| |
| /* clone data */ |
| key.objectid = src->i_ino; |
| key.type = BTRFS_EXTENT_DATA_KEY; |
| key.offset = 0; |
| |
| while (1) { |
| /* |
| * note the key will change type as we walk through the |
| * tree. |
| */ |
| ret = btrfs_search_slot(trans, root, &key, path, 0, 0); |
| if (ret < 0) |
| goto out; |
| |
| nritems = btrfs_header_nritems(path->nodes[0]); |
| if (path->slots[0] >= nritems) { |
| ret = btrfs_next_leaf(root, path); |
| if (ret < 0) |
| goto out; |
| if (ret > 0) |
| break; |
| nritems = btrfs_header_nritems(path->nodes[0]); |
| } |
| leaf = path->nodes[0]; |
| slot = path->slots[0]; |
| |
| btrfs_item_key_to_cpu(leaf, &key, slot); |
| 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 type; |
| u32 size; |
| struct btrfs_key new_key; |
| u64 disko = 0, diskl = 0; |
| u64 datao = 0, datal = 0; |
| u8 comp; |
| |
| 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; |
| 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; |
| out: |
| btrfs_release_path(root, path); |
| if (ret == 0) { |
| inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 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, off, off+len, GFP_NOFS); |
| if (ret) |
| vmtruncate(inode, 0); |
| out_unlock: |
| mutex_unlock(&src->i_mutex); |
| mutex_unlock(&inode->i_mutex); |
| vfree(buf); |
| 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. |
| */ |
| 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; |
| |
| ret = -EPERM; |
| if (!capable(CAP_SYS_ADMIN)) |
| goto out; |
| |
| 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) |
| 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; |
| } |
| |
| static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
| { |
| struct inode *inode = fdentry(file)->d_inode; |
| struct btrfs_root *root = BTRFS_I(inode)->root; |
| struct btrfs_root *new_root; |
| struct btrfs_dir_item *di; |
| struct btrfs_trans_handle *trans; |
| struct btrfs_path *path; |
| struct btrfs_key location; |
| struct btrfs_disk_key disk_key; |
| struct btrfs_super_block *disk_super; |
| u64 features; |
| u64 objectid = 0; |
| u64 dir_id; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| |
| if (copy_from_user(&objectid, argp, sizeof(objectid))) |
| return -EFAULT; |
| |
| if (!objectid) |
| objectid = root->root_key.objectid; |
| |
| location.objectid = objectid; |
| location.type = BTRFS_ROOT_ITEM_KEY; |
| location.offset = (u64)-1; |
| |
| new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); |
| if (IS_ERR(new_root)) |
| return PTR_ERR(new_root); |
| |
| if (btrfs_root_refs(&new_root->root_item) == 0) |
| return -ENOENT; |
| |
| path = btrfs_alloc_path(); |
| if (!path) |
| return -ENOMEM; |
| path->leave_spinning = 1; |
| |
| trans = btrfs_start_transaction(root, 1); |
| if (!trans) { |
| btrfs_free_path(path); |
| return -ENOMEM; |
| } |
| |
| dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); |
| di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, |
| dir_id, "default", 7, 1); |
| if (!di) { |
| btrfs_free_path(path); |
| btrfs_end_transaction(trans, root); |
| printk(KERN_ERR "Umm, you don't have the default dir item, " |
| "this isn't going to work\n"); |
| return -ENOENT; |
| } |
| |
| btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); |
| btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); |
| btrfs_mark_buffer_dirty(path->nodes[0]); |
| btrfs_free_path(path); |
| |
| disk_super = &root->fs_info->super_copy; |
| features = btrfs_super_incompat_flags(disk_super); |
| if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { |
| features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; |
| btrfs_set_super_incompat_flags(disk_super, features); |
| } |
| btrfs_end_transaction(trans, root); |
| |
| return 0; |
| } |
| |
| long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) |
| { |
| struct btrfs_ioctl_space_args space_args; |
| struct btrfs_ioctl_space_info space; |
| struct btrfs_ioctl_space_info *dest; |
| struct btrfs_ioctl_space_info *dest_orig; |
| struct btrfs_ioctl_space_info *user_dest; |
| struct btrfs_space_info *info; |
| int alloc_size; |
| int ret = 0; |
| int slot_count = 0; |
| |
| if (copy_from_user(&space_args, |
| (struct btrfs_ioctl_space_args __user *)arg, |
| sizeof(space_args))) |
| return -EFAULT; |
| |
| /* first we count slots */ |
| rcu_read_lock(); |
| list_for_each_entry_rcu(info, &root->fs_info->space_info, list) |
| slot_count++; |
| rcu_read_unlock(); |
| |
| /* space_slots == 0 means they are asking for a count */ |
| if (space_args.space_slots == 0) { |
| space_args.total_spaces = slot_count; |
| goto out; |
| } |
| alloc_size = sizeof(*dest) * slot_count; |
| /* we generally have at most 6 or so space infos, one for each raid |
| * level. So, a whole page should be more than enough for everyone |
| */ |
| if (alloc_size > PAGE_CACHE_SIZE) |
| return -ENOMEM; |
| |
| space_args.total_spaces = 0; |
| dest = kmalloc(alloc_size, GFP_NOFS); |
| if (!dest) |
| return -ENOMEM; |
| dest_orig = dest; |
| |
| /* now we have a buffer to copy into */ |
| rcu_read_lock(); |
| list_for_each_entry_rcu(info, &root->fs_info->space_info, list) { |
| /* make sure we don't copy more than we allocated |
| * in our buffer |
| */ |
| if (slot_count == 0) |
| break; |
| slot_count--; |
| |
| /* make sure userland has enough room in their buffer */ |
| if (space_args.total_spaces >= space_args.space_slots) |
| break; |
| |
| space.flags = info->flags; |
| space.total_bytes = info->total_bytes; |
| space.used_bytes = info->bytes_used; |
| memcpy(dest, &space, sizeof(space)); |
| dest++; |
| space_args.total_spaces++; |
| } |
| rcu_read_unlock(); |
| |
| user_dest = (struct btrfs_ioctl_space_info *) |
| (arg + sizeof(struct btrfs_ioctl_space_args)); |
| |
| if (copy_to_user(user_dest, dest_orig, alloc_size)) |
| ret = -EFAULT; |
| |
| kfree(dest_orig); |
| out: |
| if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) |
| ret = -EFAULT; |
| |
| return ret; |
| } |
| |
| /* |
| * 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_end(struct file *file) |
| { |
| struct inode *inode = fdentry(file)->d_inode; |
| struct btrfs_root *root = BTRFS_I(inode)->root; |
| struct btrfs_trans_handle *trans; |
| |
| trans = file->private_data; |
| 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); |
| |
| 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(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_DEFAULT_SUBVOL: |
| return btrfs_ioctl_default_subvol(file, argp); |
| case BTRFS_IOC_DEFRAG: |
| return btrfs_ioctl_defrag(file, NULL); |
| case BTRFS_IOC_DEFRAG_RANGE: |
| return btrfs_ioctl_defrag(file, argp); |
| case BTRFS_IOC_RESIZE: |
| return btrfs_ioctl_resize(root, argp); |
| case BTRFS_IOC_ADD_DEV: |
| return btrfs_ioctl_add_dev(root, argp); |
| case BTRFS_IOC_RM_DEV: |
| 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, 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_TREE_SEARCH: |
| return btrfs_ioctl_tree_search(file, argp); |
| case BTRFS_IOC_INO_LOOKUP: |
| return btrfs_ioctl_ino_lookup(file, argp); |
| case BTRFS_IOC_SPACE_INFO: |
| return btrfs_ioctl_space_info(root, argp); |
| case BTRFS_IOC_SYNC: |
| btrfs_sync_fs(file->f_dentry->d_sb, 1); |
| return 0; |
| } |
| |
| return -ENOTTY; |
| } |