Btrfs: split out ioctl.c
Split the ioctl handling out of inode.c into a file of it's own.
Also fix up checkpatch.pl warnings for the moved code.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 7daef8d..0c79346 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2667,114 +2667,17 @@
}
}
-static int noinline create_subvol(struct btrfs_root *root, char *name,
- int namelen)
+int btrfs_create_subvol_root(struct btrfs_root *new_root,
+ struct btrfs_trans_handle *trans, u64 new_dirid,
+ struct btrfs_block_group_cache *block_group)
{
- 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 *inode;
- struct inode *dir;
int ret;
- int err;
- u64 objectid;
- u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
- unsigned long nr = 1;
-
- mutex_lock(&root->fs_info->fs_mutex);
- ret = btrfs_check_free_space(root, 1, 0);
- if (ret)
- goto fail_commit;
-
- 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,
- objectid, trans->transid, 0, 0,
- 0, 0);
- if (IS_ERR(leaf))
- return PTR_ERR(leaf);
-
- btrfs_set_header_nritems(leaf, 0);
- btrfs_set_header_level(leaf, 0);
- btrfs_set_header_bytenr(leaf, leaf->start);
- btrfs_set_header_generation(leaf, trans->transid);
- btrfs_set_header_owner(leaf, objectid);
-
- write_extent_buffer(leaf, root->fs_info->fsid,
- (unsigned long)btrfs_header_fsid(leaf),
- BTRFS_FSID_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->nblocks = cpu_to_le64(1);
- inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
-
- btrfs_set_root_bytenr(&root_item, leaf->start);
- btrfs_set_root_level(&root_item, 0);
- btrfs_set_root_refs(&root_item, 1);
- btrfs_set_root_used(&root_item, 0);
-
- memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
- root_item.drop_level = 0;
-
- free_extent_buffer(leaf);
- leaf = NULL;
-
- btrfs_set_root_dirid(&root_item, new_dirid);
-
- key.objectid = objectid;
- key.offset = 1;
- 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;
-
- /*
- * 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,
- name, namelen, dir->i_ino, &key,
- BTRFS_FT_DIR);
- 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);
- if (ret)
- goto fail;
-
- 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);
inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid,
- new_dirid,
- BTRFS_I(dir)->block_group, S_IFDIR | 0700);
+ new_dirid, block_group, S_IFDIR | 0700);
if (IS_ERR(inode))
- goto fail;
+ return PTR_ERR(inode);
inode->i_op = &btrfs_dir_inode_operations;
inode->i_fop = &btrfs_dir_file_operations;
new_root->inode = inode;
@@ -2783,67 +2686,8 @@
new_dirid);
inode->i_nlink = 1;
inode->i_size = 0;
- ret = btrfs_update_inode(trans, new_root, inode);
- if (ret)
- goto fail;
- /* Invalidate existing dcache entry for new subvolume. */
- btrfs_invalidate_dcache_root(root, name, namelen);
-
-fail:
- nr = trans->blocks_used;
- err = btrfs_commit_transaction(trans, new_root);
- if (err && !ret)
- ret = err;
-fail_commit:
- mutex_unlock(&root->fs_info->fs_mutex);
- btrfs_btree_balance_dirty(root, nr);
- btrfs_throttle(root);
- return ret;
-}
-
-static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
-{
- struct btrfs_pending_snapshot *pending_snapshot;
- struct btrfs_trans_handle *trans;
- int ret;
- int err;
- unsigned long nr = 0;
-
- if (!root->ref_cows)
- return -EINVAL;
-
- mutex_lock(&root->fs_info->fs_mutex);
- ret = btrfs_check_free_space(root, 1, 0);
- if (ret)
- goto fail_unlock;
-
- pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
- if (!pending_snapshot) {
- ret = -ENOMEM;
- goto fail_unlock;
- }
- pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
- if (!pending_snapshot->name) {
- ret = -ENOMEM;
- kfree(pending_snapshot);
- goto fail_unlock;
- }
- memcpy(pending_snapshot->name, name, namelen);
- pending_snapshot->name[namelen] = '\0';
- 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:
- mutex_unlock(&root->fs_info->fs_mutex);
- btrfs_btree_balance_dirty(root, nr);
- btrfs_throttle(root);
- return ret;
+ return btrfs_update_inode(trans, new_root, inode);
}
unsigned long btrfs_force_ra(struct address_space *mapping,
@@ -2861,571 +2705,6 @@
#endif
}
-int btrfs_defrag_file(struct file *file) {
- 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 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;
- unsigned long i;
- int ret;
-
- mutex_lock(&root->fs_info->fs_mutex);
- ret = btrfs_check_free_space(root, inode->i_size, 0);
- mutex_unlock(&root->fs_info->fs_mutex);
- if (ret)
- return -ENOSPC;
-
- mutex_lock(&inode->i_mutex);
- last_index = inode->i_size >> PAGE_CACHE_SHIFT;
- for (i = 0; i <= last_index; i++) {
- 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++;
- page = grab_cache_page(inode->i_mapping, i);
- if (!page)
- goto out_unlock;
- if (!PageUptodate(page)) {
- btrfs_readpage(NULL, page);
- lock_page(page);
- if (!PageUptodate(page)) {
- unlock_page(page);
- page_cache_release(page);
- goto out_unlock;
- }
- }
-
-#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
- ClearPageDirty(page);
-#else
- cancel_dirty_page(page, PAGE_CACHE_SIZE);
-#endif
- wait_on_page_writeback(page);
- set_page_extent_mapped(page);
-
- 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);
- set_extent_delalloc(io_tree, page_start,
- page_end, GFP_NOFS);
-
- unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
- set_page_dirty(page);
- unlock_page(page);
- page_cache_release(page);
- balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
- }
-
-out_unlock:
- mutex_unlock(&inode->i_mutex);
- return 0;
-}
-
-static 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;
-
- 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;
- }
- namelen = strlen(vol_args->name);
- if (namelen > BTRFS_VOL_NAME_MAX) {
- ret = -EINVAL;
- goto out;
- }
-
- mutex_lock(&root->fs_info->fs_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("resizing devid %Lu\n", devid);
- }
- device = btrfs_find_device(root, devid, NULL);
- if (!device) {
- printk("resizer unable to find device %Lu\n", 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 = btrfs_parse_size(sizestr);
- 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("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->fs_mutex);
-out:
- kfree(vol_args);
- return ret;
-}
-
-static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root,
- void __user *arg)
-{
- struct btrfs_ioctl_vol_args *vol_args;
- struct btrfs_dir_item *di;
- struct btrfs_path *path;
- u64 root_dirid;
- int namelen;
- int ret;
-
- 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;
- }
-
- namelen = strlen(vol_args->name);
- if (namelen > BTRFS_VOL_NAME_MAX) {
- ret = -EINVAL;
- goto out;
- }
- if (strchr(vol_args->name, '/')) {
- ret = -EINVAL;
- goto out;
- }
-
- path = btrfs_alloc_path();
- if (!path) {
- ret = -ENOMEM;
- goto out;
- }
-
- root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
- mutex_lock(&root->fs_info->fs_mutex);
- di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
- path, root_dirid,
- vol_args->name, namelen, 0);
- mutex_unlock(&root->fs_info->fs_mutex);
- btrfs_free_path(path);
-
- if (di && !IS_ERR(di)) {
- ret = -EEXIST;
- goto out;
- }
-
- if (IS_ERR(di)) {
- ret = PTR_ERR(di);
- goto out;
- }
-
- if (root == root->fs_info->tree_root)
- ret = create_subvol(root, vol_args->name, namelen);
- else
- ret = create_snapshot(root, vol_args->name, namelen);
-out:
- kfree(vol_args);
- return ret;
-}
-
-static int btrfs_ioctl_defrag(struct file *file)
-{
- struct inode *inode = fdentry(file)->d_inode;
- struct btrfs_root *root = BTRFS_I(inode)->root;
-
- switch (inode->i_mode & S_IFMT) {
- case S_IFDIR:
- mutex_lock(&root->fs_info->fs_mutex);
- btrfs_defrag_root(root, 0);
- btrfs_defrag_root(root->fs_info->extent_root, 0);
- mutex_unlock(&root->fs_info->fs_mutex);
- break;
- case S_IFREG:
- btrfs_defrag_file(file);
- break;
- }
-
- return 0;
-}
-
-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 (!vol_args)
- return -ENOMEM;
-
- if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
- ret = -EFAULT;
- goto out;
- }
- 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)
-{
- struct btrfs_ioctl_vol_args *vol_args;
- int ret;
-
- 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;
- }
- ret = btrfs_rm_device(root, vol_args->name);
-
-out:
- kfree(vol_args);
- return ret;
-}
-
-int dup_item_to_inode(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct btrfs_path *path,
- struct extent_buffer *leaf,
- int slot,
- struct btrfs_key *key,
- u64 destino)
-{
- char *dup;
- int len = btrfs_item_size_nr(leaf, slot);
- struct btrfs_key ckey = *key;
- int ret = 0;
-
- dup = kmalloc(len, GFP_NOFS);
- if (!dup)
- return -ENOMEM;
-
- read_extent_buffer(leaf, dup, btrfs_item_ptr_offset(leaf, slot), len);
- btrfs_release_path(root, path);
-
- ckey.objectid = destino;
- ret = btrfs_insert_item(trans, root, &ckey, dup, len);
- kfree(dup);
- return ret;
-}
-
-long btrfs_ioctl_clone(struct file *file, unsigned long src_fd)
-{
- 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;
- int ret;
- u64 pos;
- struct btrfs_path *path;
- struct btrfs_key key;
- struct extent_buffer *leaf;
- u32 nritems;
- int slot;
-
- src_file = fget(src_fd);
- if (!src_file)
- return -EBADF;
- src = src_file->f_dentry->d_inode;
-
- ret = -EXDEV;
- if (src->i_sb != inode->i_sb)
- goto out_fput;
-
- if (inode < src) {
- mutex_lock(&inode->i_mutex);
- mutex_lock(&src->i_mutex);
- } else {
- mutex_lock(&src->i_mutex);
- mutex_lock(&inode->i_mutex);
- }
-
- ret = -ENOTEMPTY;
- if (inode->i_size)
- goto out_unlock;
-
- /* do any pending delalloc/csum calc on src, one way or
- another, and lock file content */
- while (1) {
- filemap_write_and_wait(src->i_mapping);
- lock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
- if (BTRFS_I(src)->delalloc_bytes == 0)
- break;
- unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
- }
-
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 0);
- path = btrfs_alloc_path();
- if (!path) {
- ret = -ENOMEM;
- goto out;
- }
- key.offset = 0;
- key.type = BTRFS_EXTENT_DATA_KEY;
- key.objectid = src->i_ino;
- pos = 0;
- path->reada = 2;
-
- 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;
-
- if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
- ret = btrfs_next_leaf(root, path);
- if (ret < 0)
- goto out;
- if (ret > 0)
- break;
- }
- leaf = path->nodes[0];
- slot = path->slots[0];
- btrfs_item_key_to_cpu(leaf, &key, slot);
- nritems = btrfs_header_nritems(leaf);
-
- if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_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;
- pos = key.offset;
- 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 len = btrfs_file_extent_num_bytes(leaf,
- extent);
- u64 ds = btrfs_file_extent_disk_bytenr(leaf,
- extent);
- u64 dl = btrfs_file_extent_disk_num_bytes(leaf,
- extent);
- u64 off = btrfs_file_extent_offset(leaf,
- extent);
- btrfs_insert_file_extent(trans, root,
- inode->i_ino, pos,
- ds, dl, len, off);
- /* ds == 0 means there's a hole */
- if (ds != 0) {
- btrfs_inc_extent_ref(trans, root,
- ds, dl,
- root->root_key.objectid,
- trans->transid,
- inode->i_ino, pos);
- }
- pos = key.offset + len;
- } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
- ret = dup_item_to_inode(trans, root, path,
- leaf, slot, &key,
- inode->i_ino);
- if (ret)
- goto out;
- pos = key.offset + btrfs_item_size_nr(leaf,
- slot);
- }
- } else if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) {
- ret = dup_item_to_inode(trans, root, path, leaf,
- slot, &key, inode->i_ino);
-
- if (ret)
- goto out;
- }
- key.offset++;
- btrfs_release_path(root, path);
- }
-
- ret = 0;
-out:
- btrfs_free_path(path);
-
- inode->i_blocks = src->i_blocks;
- i_size_write(inode, src->i_size);
- btrfs_update_inode(trans, root, inode);
-
- unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
-
- btrfs_end_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
-
-out_unlock:
- mutex_unlock(&src->i_mutex);
- mutex_unlock(&inode->i_mutex);
-out_fput:
- fput(src_file);
- 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_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;
-
- mutex_lock(&root->fs_info->fs_mutex);
- if (file->private_data) {
- ret = -EINPROGRESS;
- goto out;
- }
- trans = btrfs_start_transaction(root, 0);
- if (trans)
- file->private_data = trans;
- else
- ret = -ENOMEM;
- /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/
-out:
- mutex_unlock(&root->fs_info->fs_mutex);
- 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;
- int ret = 0;
-
- mutex_lock(&root->fs_info->fs_mutex);
- trans = file->private_data;
- if (!trans) {
- ret = -EINVAL;
- goto out;
- }
- btrfs_end_transaction(trans, root);
- file->private_data = 0;
-out:
- mutex_unlock(&root->fs_info->fs_mutex);
- return ret;
-}
-
-long btrfs_ioctl(struct file *file, unsigned int
- cmd, unsigned long arg)
-{
- struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
-
- switch (cmd) {
- case BTRFS_IOC_SNAP_CREATE:
- return btrfs_ioctl_snap_create(root, (void __user *)arg);
- case BTRFS_IOC_DEFRAG:
- return btrfs_ioctl_defrag(file);
- case BTRFS_IOC_RESIZE:
- return btrfs_ioctl_resize(root, (void __user *)arg);
- case BTRFS_IOC_ADD_DEV:
- return btrfs_ioctl_add_dev(root, (void __user *)arg);
- case BTRFS_IOC_RM_DEV:
- return btrfs_ioctl_rm_dev(root, (void __user *)arg);
- case BTRFS_IOC_BALANCE:
- return btrfs_balance(root->fs_info->dev_root);
- case BTRFS_IOC_CLONE:
- return btrfs_ioctl_clone(file, arg);
- 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_sync_fs(file->f_dentry->d_sb, 1);
- return 0;
- }
-
- return -ENOTTY;
-}
-
-/*
- * Called inside transaction, so use GFP_NOFS
- */
struct inode *btrfs_alloc_inode(struct super_block *sb)
{
struct btrfs_inode *ei;