mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 09:50:04 +00:00
4659 lines
103 KiB
C
4659 lines
103 KiB
C
/*
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* Copyright (C) 2012 Alexander Block. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/bsearch.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/sort.h>
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#include <linux/mount.h>
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#include <linux/xattr.h>
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#include <linux/posix_acl_xattr.h>
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#include <linux/radix-tree.h>
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#include <linux/crc32c.h>
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#include <linux/vmalloc.h>
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#include "send.h"
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#include "backref.h"
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#include "locking.h"
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#include "disk-io.h"
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#include "btrfs_inode.h"
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#include "transaction.h"
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static int g_verbose = 0;
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#define verbose_printk(...) if (g_verbose) printk(__VA_ARGS__)
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/*
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* A fs_path is a helper to dynamically build path names with unknown size.
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* It reallocates the internal buffer on demand.
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* It allows fast adding of path elements on the right side (normal path) and
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* fast adding to the left side (reversed path). A reversed path can also be
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* unreversed if needed.
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*/
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struct fs_path {
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union {
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struct {
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char *start;
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char *end;
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char *prepared;
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char *buf;
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int buf_len;
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int reversed:1;
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int virtual_mem:1;
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char inline_buf[];
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};
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char pad[PAGE_SIZE];
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};
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};
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#define FS_PATH_INLINE_SIZE \
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(sizeof(struct fs_path) - offsetof(struct fs_path, inline_buf))
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/* reused for each extent */
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struct clone_root {
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struct btrfs_root *root;
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u64 ino;
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u64 offset;
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u64 found_refs;
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};
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#define SEND_CTX_MAX_NAME_CACHE_SIZE 128
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#define SEND_CTX_NAME_CACHE_CLEAN_SIZE (SEND_CTX_MAX_NAME_CACHE_SIZE * 2)
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struct send_ctx {
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struct file *send_filp;
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loff_t send_off;
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char *send_buf;
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u32 send_size;
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u32 send_max_size;
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u64 total_send_size;
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u64 cmd_send_size[BTRFS_SEND_C_MAX + 1];
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struct vfsmount *mnt;
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struct btrfs_root *send_root;
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struct btrfs_root *parent_root;
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struct clone_root *clone_roots;
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int clone_roots_cnt;
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/* current state of the compare_tree call */
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struct btrfs_path *left_path;
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struct btrfs_path *right_path;
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struct btrfs_key *cmp_key;
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/*
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* infos of the currently processed inode. In case of deleted inodes,
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* these are the values from the deleted inode.
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*/
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u64 cur_ino;
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u64 cur_inode_gen;
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int cur_inode_new;
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int cur_inode_new_gen;
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int cur_inode_deleted;
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u64 cur_inode_size;
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u64 cur_inode_mode;
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u64 send_progress;
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struct list_head new_refs;
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struct list_head deleted_refs;
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struct radix_tree_root name_cache;
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struct list_head name_cache_list;
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int name_cache_size;
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struct file *cur_inode_filp;
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char *read_buf;
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};
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struct name_cache_entry {
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struct list_head list;
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/*
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* radix_tree has only 32bit entries but we need to handle 64bit inums.
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* We use the lower 32bit of the 64bit inum to store it in the tree. If
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* more then one inum would fall into the same entry, we use radix_list
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* to store the additional entries. radix_list is also used to store
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* entries where two entries have the same inum but different
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* generations.
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*/
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struct list_head radix_list;
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u64 ino;
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u64 gen;
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u64 parent_ino;
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u64 parent_gen;
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int ret;
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int need_later_update;
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int name_len;
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char name[];
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};
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static void fs_path_reset(struct fs_path *p)
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{
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if (p->reversed) {
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p->start = p->buf + p->buf_len - 1;
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p->end = p->start;
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*p->start = 0;
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} else {
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p->start = p->buf;
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p->end = p->start;
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*p->start = 0;
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}
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}
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static struct fs_path *fs_path_alloc(struct send_ctx *sctx)
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{
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struct fs_path *p;
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p = kmalloc(sizeof(*p), GFP_NOFS);
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if (!p)
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return NULL;
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p->reversed = 0;
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p->virtual_mem = 0;
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p->buf = p->inline_buf;
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p->buf_len = FS_PATH_INLINE_SIZE;
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fs_path_reset(p);
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return p;
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}
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static struct fs_path *fs_path_alloc_reversed(struct send_ctx *sctx)
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{
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struct fs_path *p;
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p = fs_path_alloc(sctx);
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if (!p)
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return NULL;
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p->reversed = 1;
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fs_path_reset(p);
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return p;
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}
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static void fs_path_free(struct send_ctx *sctx, struct fs_path *p)
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{
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if (!p)
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return;
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if (p->buf != p->inline_buf) {
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if (p->virtual_mem)
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vfree(p->buf);
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else
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kfree(p->buf);
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}
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kfree(p);
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}
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static int fs_path_len(struct fs_path *p)
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{
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return p->end - p->start;
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}
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static int fs_path_ensure_buf(struct fs_path *p, int len)
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{
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char *tmp_buf;
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int path_len;
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int old_buf_len;
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len++;
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if (p->buf_len >= len)
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return 0;
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path_len = p->end - p->start;
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old_buf_len = p->buf_len;
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len = PAGE_ALIGN(len);
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if (p->buf == p->inline_buf) {
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tmp_buf = kmalloc(len, GFP_NOFS);
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if (!tmp_buf) {
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tmp_buf = vmalloc(len);
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if (!tmp_buf)
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return -ENOMEM;
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p->virtual_mem = 1;
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}
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memcpy(tmp_buf, p->buf, p->buf_len);
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p->buf = tmp_buf;
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p->buf_len = len;
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} else {
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if (p->virtual_mem) {
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tmp_buf = vmalloc(len);
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if (!tmp_buf)
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return -ENOMEM;
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memcpy(tmp_buf, p->buf, p->buf_len);
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vfree(p->buf);
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} else {
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tmp_buf = krealloc(p->buf, len, GFP_NOFS);
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if (!tmp_buf) {
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tmp_buf = vmalloc(len);
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if (!tmp_buf)
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return -ENOMEM;
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memcpy(tmp_buf, p->buf, p->buf_len);
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kfree(p->buf);
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p->virtual_mem = 1;
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}
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}
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p->buf = tmp_buf;
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p->buf_len = len;
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}
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if (p->reversed) {
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tmp_buf = p->buf + old_buf_len - path_len - 1;
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p->end = p->buf + p->buf_len - 1;
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p->start = p->end - path_len;
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memmove(p->start, tmp_buf, path_len + 1);
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} else {
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p->start = p->buf;
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p->end = p->start + path_len;
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}
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return 0;
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}
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static int fs_path_prepare_for_add(struct fs_path *p, int name_len)
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{
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int ret;
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int new_len;
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new_len = p->end - p->start + name_len;
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if (p->start != p->end)
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new_len++;
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ret = fs_path_ensure_buf(p, new_len);
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if (ret < 0)
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goto out;
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if (p->reversed) {
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if (p->start != p->end)
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*--p->start = '/';
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p->start -= name_len;
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p->prepared = p->start;
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} else {
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if (p->start != p->end)
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*p->end++ = '/';
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p->prepared = p->end;
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p->end += name_len;
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*p->end = 0;
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}
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out:
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return ret;
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}
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static int fs_path_add(struct fs_path *p, const char *name, int name_len)
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{
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int ret;
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ret = fs_path_prepare_for_add(p, name_len);
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if (ret < 0)
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goto out;
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memcpy(p->prepared, name, name_len);
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p->prepared = NULL;
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out:
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return ret;
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}
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static int fs_path_add_path(struct fs_path *p, struct fs_path *p2)
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{
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int ret;
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ret = fs_path_prepare_for_add(p, p2->end - p2->start);
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if (ret < 0)
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goto out;
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memcpy(p->prepared, p2->start, p2->end - p2->start);
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p->prepared = NULL;
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out:
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return ret;
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}
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static int fs_path_add_from_extent_buffer(struct fs_path *p,
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struct extent_buffer *eb,
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unsigned long off, int len)
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{
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int ret;
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ret = fs_path_prepare_for_add(p, len);
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if (ret < 0)
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goto out;
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read_extent_buffer(eb, p->prepared, off, len);
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p->prepared = NULL;
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out:
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return ret;
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}
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#if 0
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static void fs_path_remove(struct fs_path *p)
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{
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BUG_ON(p->reversed);
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while (p->start != p->end && *p->end != '/')
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p->end--;
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*p->end = 0;
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}
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#endif
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static int fs_path_copy(struct fs_path *p, struct fs_path *from)
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{
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int ret;
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p->reversed = from->reversed;
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fs_path_reset(p);
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ret = fs_path_add_path(p, from);
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return ret;
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}
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static void fs_path_unreverse(struct fs_path *p)
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{
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char *tmp;
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int len;
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if (!p->reversed)
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return;
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tmp = p->start;
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len = p->end - p->start;
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p->start = p->buf;
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p->end = p->start + len;
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memmove(p->start, tmp, len + 1);
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p->reversed = 0;
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}
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static struct btrfs_path *alloc_path_for_send(void)
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{
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struct btrfs_path *path;
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path = btrfs_alloc_path();
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if (!path)
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return NULL;
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path->search_commit_root = 1;
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path->skip_locking = 1;
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return path;
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}
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int write_buf(struct file *filp, const void *buf, u32 len, loff_t *off)
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{
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int ret;
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mm_segment_t old_fs;
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u32 pos = 0;
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old_fs = get_fs();
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set_fs(KERNEL_DS);
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while (pos < len) {
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ret = vfs_write(filp, (char *)buf + pos, len - pos, off);
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/* TODO handle that correctly */
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/*if (ret == -ERESTARTSYS) {
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continue;
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}*/
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if (ret < 0)
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goto out;
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if (ret == 0) {
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ret = -EIO;
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goto out;
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}
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pos += ret;
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}
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ret = 0;
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out:
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set_fs(old_fs);
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return ret;
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}
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|
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static int tlv_put(struct send_ctx *sctx, u16 attr, const void *data, int len)
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{
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struct btrfs_tlv_header *hdr;
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int total_len = sizeof(*hdr) + len;
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int left = sctx->send_max_size - sctx->send_size;
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|
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if (unlikely(left < total_len))
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return -EOVERFLOW;
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|
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hdr = (struct btrfs_tlv_header *) (sctx->send_buf + sctx->send_size);
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hdr->tlv_type = cpu_to_le16(attr);
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hdr->tlv_len = cpu_to_le16(len);
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memcpy(hdr + 1, data, len);
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sctx->send_size += total_len;
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return 0;
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}
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|
|
|
#if 0
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static int tlv_put_u8(struct send_ctx *sctx, u16 attr, u8 value)
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{
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return tlv_put(sctx, attr, &value, sizeof(value));
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|
}
|
|
|
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static int tlv_put_u16(struct send_ctx *sctx, u16 attr, u16 value)
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|
{
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|
__le16 tmp = cpu_to_le16(value);
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return tlv_put(sctx, attr, &tmp, sizeof(tmp));
|
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}
|
|
|
|
static int tlv_put_u32(struct send_ctx *sctx, u16 attr, u32 value)
|
|
{
|
|
__le32 tmp = cpu_to_le32(value);
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return tlv_put(sctx, attr, &tmp, sizeof(tmp));
|
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}
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#endif
|
|
|
|
static int tlv_put_u64(struct send_ctx *sctx, u16 attr, u64 value)
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|
{
|
|
__le64 tmp = cpu_to_le64(value);
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return tlv_put(sctx, attr, &tmp, sizeof(tmp));
|
|
}
|
|
|
|
static int tlv_put_string(struct send_ctx *sctx, u16 attr,
|
|
const char *str, int len)
|
|
{
|
|
if (len == -1)
|
|
len = strlen(str);
|
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return tlv_put(sctx, attr, str, len);
|
|
}
|
|
|
|
static int tlv_put_uuid(struct send_ctx *sctx, u16 attr,
|
|
const u8 *uuid)
|
|
{
|
|
return tlv_put(sctx, attr, uuid, BTRFS_UUID_SIZE);
|
|
}
|
|
|
|
#if 0
|
|
static int tlv_put_timespec(struct send_ctx *sctx, u16 attr,
|
|
struct timespec *ts)
|
|
{
|
|
struct btrfs_timespec bts;
|
|
bts.sec = cpu_to_le64(ts->tv_sec);
|
|
bts.nsec = cpu_to_le32(ts->tv_nsec);
|
|
return tlv_put(sctx, attr, &bts, sizeof(bts));
|
|
}
|
|
#endif
|
|
|
|
static int tlv_put_btrfs_timespec(struct send_ctx *sctx, u16 attr,
|
|
struct extent_buffer *eb,
|
|
struct btrfs_timespec *ts)
|
|
{
|
|
struct btrfs_timespec bts;
|
|
read_extent_buffer(eb, &bts, (unsigned long)ts, sizeof(bts));
|
|
return tlv_put(sctx, attr, &bts, sizeof(bts));
|
|
}
|
|
|
|
|
|
#define TLV_PUT(sctx, attrtype, attrlen, data) \
|
|
do { \
|
|
ret = tlv_put(sctx, attrtype, attrlen, data); \
|
|
if (ret < 0) \
|
|
goto tlv_put_failure; \
|
|
} while (0)
|
|
|
|
#define TLV_PUT_INT(sctx, attrtype, bits, value) \
|
|
do { \
|
|
ret = tlv_put_u##bits(sctx, attrtype, value); \
|
|
if (ret < 0) \
|
|
goto tlv_put_failure; \
|
|
} while (0)
|
|
|
|
#define TLV_PUT_U8(sctx, attrtype, data) TLV_PUT_INT(sctx, attrtype, 8, data)
|
|
#define TLV_PUT_U16(sctx, attrtype, data) TLV_PUT_INT(sctx, attrtype, 16, data)
|
|
#define TLV_PUT_U32(sctx, attrtype, data) TLV_PUT_INT(sctx, attrtype, 32, data)
|
|
#define TLV_PUT_U64(sctx, attrtype, data) TLV_PUT_INT(sctx, attrtype, 64, data)
|
|
#define TLV_PUT_STRING(sctx, attrtype, str, len) \
|
|
do { \
|
|
ret = tlv_put_string(sctx, attrtype, str, len); \
|
|
if (ret < 0) \
|
|
goto tlv_put_failure; \
|
|
} while (0)
|
|
#define TLV_PUT_PATH(sctx, attrtype, p) \
|
|
do { \
|
|
ret = tlv_put_string(sctx, attrtype, p->start, \
|
|
p->end - p->start); \
|
|
if (ret < 0) \
|
|
goto tlv_put_failure; \
|
|
} while(0)
|
|
#define TLV_PUT_UUID(sctx, attrtype, uuid) \
|
|
do { \
|
|
ret = tlv_put_uuid(sctx, attrtype, uuid); \
|
|
if (ret < 0) \
|
|
goto tlv_put_failure; \
|
|
} while (0)
|
|
#define TLV_PUT_TIMESPEC(sctx, attrtype, ts) \
|
|
do { \
|
|
ret = tlv_put_timespec(sctx, attrtype, ts); \
|
|
if (ret < 0) \
|
|
goto tlv_put_failure; \
|
|
} while (0)
|
|
#define TLV_PUT_BTRFS_TIMESPEC(sctx, attrtype, eb, ts) \
|
|
do { \
|
|
ret = tlv_put_btrfs_timespec(sctx, attrtype, eb, ts); \
|
|
if (ret < 0) \
|
|
goto tlv_put_failure; \
|
|
} while (0)
|
|
|
|
static int send_header(struct send_ctx *sctx)
|
|
{
|
|
struct btrfs_stream_header hdr;
|
|
|
|
strcpy(hdr.magic, BTRFS_SEND_STREAM_MAGIC);
|
|
hdr.version = cpu_to_le32(BTRFS_SEND_STREAM_VERSION);
|
|
|
|
return write_buf(sctx->send_filp, &hdr, sizeof(hdr),
|
|
&sctx->send_off);
|
|
}
|
|
|
|
/*
|
|
* For each command/item we want to send to userspace, we call this function.
|
|
*/
|
|
static int begin_cmd(struct send_ctx *sctx, int cmd)
|
|
{
|
|
struct btrfs_cmd_header *hdr;
|
|
|
|
if (!sctx->send_buf) {
|
|
WARN_ON(1);
|
|
return -EINVAL;
|
|
}
|
|
|
|
BUG_ON(sctx->send_size);
|
|
|
|
sctx->send_size += sizeof(*hdr);
|
|
hdr = (struct btrfs_cmd_header *)sctx->send_buf;
|
|
hdr->cmd = cpu_to_le16(cmd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int send_cmd(struct send_ctx *sctx)
|
|
{
|
|
int ret;
|
|
struct btrfs_cmd_header *hdr;
|
|
u32 crc;
|
|
|
|
hdr = (struct btrfs_cmd_header *)sctx->send_buf;
|
|
hdr->len = cpu_to_le32(sctx->send_size - sizeof(*hdr));
|
|
hdr->crc = 0;
|
|
|
|
crc = crc32c(0, (unsigned char *)sctx->send_buf, sctx->send_size);
|
|
hdr->crc = cpu_to_le32(crc);
|
|
|
|
ret = write_buf(sctx->send_filp, sctx->send_buf, sctx->send_size,
|
|
&sctx->send_off);
|
|
|
|
sctx->total_send_size += sctx->send_size;
|
|
sctx->cmd_send_size[le16_to_cpu(hdr->cmd)] += sctx->send_size;
|
|
sctx->send_size = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Sends a move instruction to user space
|
|
*/
|
|
static int send_rename(struct send_ctx *sctx,
|
|
struct fs_path *from, struct fs_path *to)
|
|
{
|
|
int ret;
|
|
|
|
verbose_printk("btrfs: send_rename %s -> %s\n", from->start, to->start);
|
|
|
|
ret = begin_cmd(sctx, BTRFS_SEND_C_RENAME);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, from);
|
|
TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH_TO, to);
|
|
|
|
ret = send_cmd(sctx);
|
|
|
|
tlv_put_failure:
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Sends a link instruction to user space
|
|
*/
|
|
static int send_link(struct send_ctx *sctx,
|
|
struct fs_path *path, struct fs_path *lnk)
|
|
{
|
|
int ret;
|
|
|
|
verbose_printk("btrfs: send_link %s -> %s\n", path->start, lnk->start);
|
|
|
|
ret = begin_cmd(sctx, BTRFS_SEND_C_LINK);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, path);
|
|
TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH_LINK, lnk);
|
|
|
|
ret = send_cmd(sctx);
|
|
|
|
tlv_put_failure:
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Sends an unlink instruction to user space
|
|
*/
|
|
static int send_unlink(struct send_ctx *sctx, struct fs_path *path)
|
|
{
|
|
int ret;
|
|
|
|
verbose_printk("btrfs: send_unlink %s\n", path->start);
|
|
|
|
ret = begin_cmd(sctx, BTRFS_SEND_C_UNLINK);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, path);
|
|
|
|
ret = send_cmd(sctx);
|
|
|
|
tlv_put_failure:
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Sends a rmdir instruction to user space
|
|
*/
|
|
static int send_rmdir(struct send_ctx *sctx, struct fs_path *path)
|
|
{
|
|
int ret;
|
|
|
|
verbose_printk("btrfs: send_rmdir %s\n", path->start);
|
|
|
|
ret = begin_cmd(sctx, BTRFS_SEND_C_RMDIR);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, path);
|
|
|
|
ret = send_cmd(sctx);
|
|
|
|
tlv_put_failure:
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Helper function to retrieve some fields from an inode item.
|
|
*/
|
|
static int get_inode_info(struct btrfs_root *root,
|
|
u64 ino, u64 *size, u64 *gen,
|
|
u64 *mode, u64 *uid, u64 *gid,
|
|
u64 *rdev)
|
|
{
|
|
int ret;
|
|
struct btrfs_inode_item *ii;
|
|
struct btrfs_key key;
|
|
struct btrfs_path *path;
|
|
|
|
path = alloc_path_for_send();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
key.objectid = ino;
|
|
key.type = BTRFS_INODE_ITEM_KEY;
|
|
key.offset = 0;
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
ii = btrfs_item_ptr(path->nodes[0], path->slots[0],
|
|
struct btrfs_inode_item);
|
|
if (size)
|
|
*size = btrfs_inode_size(path->nodes[0], ii);
|
|
if (gen)
|
|
*gen = btrfs_inode_generation(path->nodes[0], ii);
|
|
if (mode)
|
|
*mode = btrfs_inode_mode(path->nodes[0], ii);
|
|
if (uid)
|
|
*uid = btrfs_inode_uid(path->nodes[0], ii);
|
|
if (gid)
|
|
*gid = btrfs_inode_gid(path->nodes[0], ii);
|
|
if (rdev)
|
|
*rdev = btrfs_inode_rdev(path->nodes[0], ii);
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
typedef int (*iterate_inode_ref_t)(int num, u64 dir, int index,
|
|
struct fs_path *p,
|
|
void *ctx);
|
|
|
|
/*
|
|
* Helper function to iterate the entries in ONE btrfs_inode_ref.
|
|
* The iterate callback may return a non zero value to stop iteration. This can
|
|
* be a negative value for error codes or 1 to simply stop it.
|
|
*
|
|
* path must point to the INODE_REF when called.
|
|
*/
|
|
static int iterate_inode_ref(struct send_ctx *sctx,
|
|
struct btrfs_root *root, struct btrfs_path *path,
|
|
struct btrfs_key *found_key, int resolve,
|
|
iterate_inode_ref_t iterate, void *ctx)
|
|
{
|
|
struct extent_buffer *eb;
|
|
struct btrfs_item *item;
|
|
struct btrfs_inode_ref *iref;
|
|
struct btrfs_path *tmp_path;
|
|
struct fs_path *p;
|
|
u32 cur;
|
|
u32 len;
|
|
u32 total;
|
|
int slot;
|
|
u32 name_len;
|
|
char *start;
|
|
int ret = 0;
|
|
int num;
|
|
int index;
|
|
|
|
p = fs_path_alloc_reversed(sctx);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
tmp_path = alloc_path_for_send();
|
|
if (!tmp_path) {
|
|
fs_path_free(sctx, p);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
eb = path->nodes[0];
|
|
slot = path->slots[0];
|
|
item = btrfs_item_nr(eb, slot);
|
|
iref = btrfs_item_ptr(eb, slot, struct btrfs_inode_ref);
|
|
cur = 0;
|
|
len = 0;
|
|
total = btrfs_item_size(eb, item);
|
|
|
|
num = 0;
|
|
while (cur < total) {
|
|
fs_path_reset(p);
|
|
|
|
name_len = btrfs_inode_ref_name_len(eb, iref);
|
|
index = btrfs_inode_ref_index(eb, iref);
|
|
if (resolve) {
|
|
start = btrfs_iref_to_path(root, tmp_path, iref, eb,
|
|
found_key->offset, p->buf,
|
|
p->buf_len);
|
|
if (IS_ERR(start)) {
|
|
ret = PTR_ERR(start);
|
|
goto out;
|
|
}
|
|
if (start < p->buf) {
|
|
/* overflow , try again with larger buffer */
|
|
ret = fs_path_ensure_buf(p,
|
|
p->buf_len + p->buf - start);
|
|
if (ret < 0)
|
|
goto out;
|
|
start = btrfs_iref_to_path(root, tmp_path, iref,
|
|
eb, found_key->offset, p->buf,
|
|
p->buf_len);
|
|
if (IS_ERR(start)) {
|
|
ret = PTR_ERR(start);
|
|
goto out;
|
|
}
|
|
BUG_ON(start < p->buf);
|
|
}
|
|
p->start = start;
|
|
} else {
|
|
ret = fs_path_add_from_extent_buffer(p, eb,
|
|
(unsigned long)(iref + 1), name_len);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
|
|
len = sizeof(*iref) + name_len;
|
|
iref = (struct btrfs_inode_ref *)((char *)iref + len);
|
|
cur += len;
|
|
|
|
ret = iterate(num, found_key->offset, index, p, ctx);
|
|
if (ret)
|
|
goto out;
|
|
|
|
num++;
|
|
}
|
|
|
|
out:
|
|
btrfs_free_path(tmp_path);
|
|
fs_path_free(sctx, p);
|
|
return ret;
|
|
}
|
|
|
|
typedef int (*iterate_dir_item_t)(int num, struct btrfs_key *di_key,
|
|
const char *name, int name_len,
|
|
const char *data, int data_len,
|
|
u8 type, void *ctx);
|
|
|
|
/*
|
|
* Helper function to iterate the entries in ONE btrfs_dir_item.
|
|
* The iterate callback may return a non zero value to stop iteration. This can
|
|
* be a negative value for error codes or 1 to simply stop it.
|
|
*
|
|
* path must point to the dir item when called.
|
|
*/
|
|
static int iterate_dir_item(struct send_ctx *sctx,
|
|
struct btrfs_root *root, struct btrfs_path *path,
|
|
struct btrfs_key *found_key,
|
|
iterate_dir_item_t iterate, void *ctx)
|
|
{
|
|
int ret = 0;
|
|
struct extent_buffer *eb;
|
|
struct btrfs_item *item;
|
|
struct btrfs_dir_item *di;
|
|
struct btrfs_key di_key;
|
|
char *buf = NULL;
|
|
char *buf2 = NULL;
|
|
int buf_len;
|
|
int buf_virtual = 0;
|
|
u32 name_len;
|
|
u32 data_len;
|
|
u32 cur;
|
|
u32 len;
|
|
u32 total;
|
|
int slot;
|
|
int num;
|
|
u8 type;
|
|
|
|
buf_len = PAGE_SIZE;
|
|
buf = kmalloc(buf_len, GFP_NOFS);
|
|
if (!buf) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
eb = path->nodes[0];
|
|
slot = path->slots[0];
|
|
item = btrfs_item_nr(eb, slot);
|
|
di = btrfs_item_ptr(eb, slot, struct btrfs_dir_item);
|
|
cur = 0;
|
|
len = 0;
|
|
total = btrfs_item_size(eb, item);
|
|
|
|
num = 0;
|
|
while (cur < total) {
|
|
name_len = btrfs_dir_name_len(eb, di);
|
|
data_len = btrfs_dir_data_len(eb, di);
|
|
type = btrfs_dir_type(eb, di);
|
|
btrfs_dir_item_key_to_cpu(eb, di, &di_key);
|
|
|
|
if (name_len + data_len > buf_len) {
|
|
buf_len = PAGE_ALIGN(name_len + data_len);
|
|
if (buf_virtual) {
|
|
buf2 = vmalloc(buf_len);
|
|
if (!buf2) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
vfree(buf);
|
|
} else {
|
|
buf2 = krealloc(buf, buf_len, GFP_NOFS);
|
|
if (!buf2) {
|
|
buf2 = vmalloc(buf_len);
|
|
if (!buf2) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
kfree(buf);
|
|
buf_virtual = 1;
|
|
}
|
|
}
|
|
|
|
buf = buf2;
|
|
buf2 = NULL;
|
|
}
|
|
|
|
read_extent_buffer(eb, buf, (unsigned long)(di + 1),
|
|
name_len + data_len);
|
|
|
|
len = sizeof(*di) + name_len + data_len;
|
|
di = (struct btrfs_dir_item *)((char *)di + len);
|
|
cur += len;
|
|
|
|
ret = iterate(num, &di_key, buf, name_len, buf + name_len,
|
|
data_len, type, ctx);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
num++;
|
|
}
|
|
|
|
out:
|
|
if (buf_virtual)
|
|
vfree(buf);
|
|
else
|
|
kfree(buf);
|
|
return ret;
|
|
}
|
|
|
|
static int __copy_first_ref(int num, u64 dir, int index,
|
|
struct fs_path *p, void *ctx)
|
|
{
|
|
int ret;
|
|
struct fs_path *pt = ctx;
|
|
|
|
ret = fs_path_copy(pt, p);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* we want the first only */
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Retrieve the first path of an inode. If an inode has more then one
|
|
* ref/hardlink, this is ignored.
|
|
*/
|
|
static int get_inode_path(struct send_ctx *sctx, struct btrfs_root *root,
|
|
u64 ino, struct fs_path *path)
|
|
{
|
|
int ret;
|
|
struct btrfs_key key, found_key;
|
|
struct btrfs_path *p;
|
|
|
|
p = alloc_path_for_send();
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
fs_path_reset(path);
|
|
|
|
key.objectid = ino;
|
|
key.type = BTRFS_INODE_REF_KEY;
|
|
key.offset = 0;
|
|
|
|
ret = btrfs_search_slot_for_read(root, &key, p, 1, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret) {
|
|
ret = 1;
|
|
goto out;
|
|
}
|
|
btrfs_item_key_to_cpu(p->nodes[0], &found_key, p->slots[0]);
|
|
if (found_key.objectid != ino ||
|
|
found_key.type != BTRFS_INODE_REF_KEY) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
ret = iterate_inode_ref(sctx, root, p, &found_key, 1,
|
|
__copy_first_ref, path);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = 0;
|
|
|
|
out:
|
|
btrfs_free_path(p);
|
|
return ret;
|
|
}
|
|
|
|
struct backref_ctx {
|
|
struct send_ctx *sctx;
|
|
|
|
/* number of total found references */
|
|
u64 found;
|
|
|
|
/*
|
|
* used for clones found in send_root. clones found behind cur_objectid
|
|
* and cur_offset are not considered as allowed clones.
|
|
*/
|
|
u64 cur_objectid;
|
|
u64 cur_offset;
|
|
|
|
/* may be truncated in case it's the last extent in a file */
|
|
u64 extent_len;
|
|
|
|
/* Just to check for bugs in backref resolving */
|
|
int found_itself;
|
|
};
|
|
|
|
static int __clone_root_cmp_bsearch(const void *key, const void *elt)
|
|
{
|
|
u64 root = (u64)(uintptr_t)key;
|
|
struct clone_root *cr = (struct clone_root *)elt;
|
|
|
|
if (root < cr->root->objectid)
|
|
return -1;
|
|
if (root > cr->root->objectid)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int __clone_root_cmp_sort(const void *e1, const void *e2)
|
|
{
|
|
struct clone_root *cr1 = (struct clone_root *)e1;
|
|
struct clone_root *cr2 = (struct clone_root *)e2;
|
|
|
|
if (cr1->root->objectid < cr2->root->objectid)
|
|
return -1;
|
|
if (cr1->root->objectid > cr2->root->objectid)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Called for every backref that is found for the current extent.
|
|
* Results are collected in sctx->clone_roots->ino/offset/found_refs
|
|
*/
|
|
static int __iterate_backrefs(u64 ino, u64 offset, u64 root, void *ctx_)
|
|
{
|
|
struct backref_ctx *bctx = ctx_;
|
|
struct clone_root *found;
|
|
int ret;
|
|
u64 i_size;
|
|
|
|
/* First check if the root is in the list of accepted clone sources */
|
|
found = bsearch((void *)(uintptr_t)root, bctx->sctx->clone_roots,
|
|
bctx->sctx->clone_roots_cnt,
|
|
sizeof(struct clone_root),
|
|
__clone_root_cmp_bsearch);
|
|
if (!found)
|
|
return 0;
|
|
|
|
if (found->root == bctx->sctx->send_root &&
|
|
ino == bctx->cur_objectid &&
|
|
offset == bctx->cur_offset) {
|
|
bctx->found_itself = 1;
|
|
}
|
|
|
|
/*
|
|
* There are inodes that have extents that lie behind its i_size. Don't
|
|
* accept clones from these extents.
|
|
*/
|
|
ret = get_inode_info(found->root, ino, &i_size, NULL, NULL, NULL, NULL,
|
|
NULL);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (offset + bctx->extent_len > i_size)
|
|
return 0;
|
|
|
|
/*
|
|
* Make sure we don't consider clones from send_root that are
|
|
* behind the current inode/offset.
|
|
*/
|
|
if (found->root == bctx->sctx->send_root) {
|
|
/*
|
|
* TODO for the moment we don't accept clones from the inode
|
|
* that is currently send. We may change this when
|
|
* BTRFS_IOC_CLONE_RANGE supports cloning from and to the same
|
|
* file.
|
|
*/
|
|
if (ino >= bctx->cur_objectid)
|
|
return 0;
|
|
#if 0
|
|
if (ino > bctx->cur_objectid)
|
|
return 0;
|
|
if (offset + bctx->extent_len > bctx->cur_offset)
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
bctx->found++;
|
|
found->found_refs++;
|
|
if (ino < found->ino) {
|
|
found->ino = ino;
|
|
found->offset = offset;
|
|
} else if (found->ino == ino) {
|
|
/*
|
|
* same extent found more then once in the same file.
|
|
*/
|
|
if (found->offset > offset + bctx->extent_len)
|
|
found->offset = offset;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Given an inode, offset and extent item, it finds a good clone for a clone
|
|
* instruction. Returns -ENOENT when none could be found. The function makes
|
|
* sure that the returned clone is usable at the point where sending is at the
|
|
* moment. This means, that no clones are accepted which lie behind the current
|
|
* inode+offset.
|
|
*
|
|
* path must point to the extent item when called.
|
|
*/
|
|
static int find_extent_clone(struct send_ctx *sctx,
|
|
struct btrfs_path *path,
|
|
u64 ino, u64 data_offset,
|
|
u64 ino_size,
|
|
struct clone_root **found)
|
|
{
|
|
int ret;
|
|
int extent_type;
|
|
u64 logical;
|
|
u64 disk_byte;
|
|
u64 num_bytes;
|
|
u64 extent_item_pos;
|
|
u64 flags = 0;
|
|
struct btrfs_file_extent_item *fi;
|
|
struct extent_buffer *eb = path->nodes[0];
|
|
struct backref_ctx *backref_ctx = NULL;
|
|
struct clone_root *cur_clone_root;
|
|
struct btrfs_key found_key;
|
|
struct btrfs_path *tmp_path;
|
|
int compressed;
|
|
u32 i;
|
|
|
|
tmp_path = alloc_path_for_send();
|
|
if (!tmp_path)
|
|
return -ENOMEM;
|
|
|
|
backref_ctx = kmalloc(sizeof(*backref_ctx), GFP_NOFS);
|
|
if (!backref_ctx) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (data_offset >= ino_size) {
|
|
/*
|
|
* There may be extents that lie behind the file's size.
|
|
* I at least had this in combination with snapshotting while
|
|
* writing large files.
|
|
*/
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
fi = btrfs_item_ptr(eb, path->slots[0],
|
|
struct btrfs_file_extent_item);
|
|
extent_type = btrfs_file_extent_type(eb, fi);
|
|
if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
compressed = btrfs_file_extent_compression(eb, fi);
|
|
|
|
num_bytes = btrfs_file_extent_num_bytes(eb, fi);
|
|
disk_byte = btrfs_file_extent_disk_bytenr(eb, fi);
|
|
if (disk_byte == 0) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
logical = disk_byte + btrfs_file_extent_offset(eb, fi);
|
|
|
|
ret = extent_from_logical(sctx->send_root->fs_info, disk_byte, tmp_path,
|
|
&found_key, &flags);
|
|
btrfs_release_path(tmp_path);
|
|
|
|
if (ret < 0)
|
|
goto out;
|
|
if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Setup the clone roots.
|
|
*/
|
|
for (i = 0; i < sctx->clone_roots_cnt; i++) {
|
|
cur_clone_root = sctx->clone_roots + i;
|
|
cur_clone_root->ino = (u64)-1;
|
|
cur_clone_root->offset = 0;
|
|
cur_clone_root->found_refs = 0;
|
|
}
|
|
|
|
backref_ctx->sctx = sctx;
|
|
backref_ctx->found = 0;
|
|
backref_ctx->cur_objectid = ino;
|
|
backref_ctx->cur_offset = data_offset;
|
|
backref_ctx->found_itself = 0;
|
|
backref_ctx->extent_len = num_bytes;
|
|
|
|
/*
|
|
* The last extent of a file may be too large due to page alignment.
|
|
* We need to adjust extent_len in this case so that the checks in
|
|
* __iterate_backrefs work.
|
|
*/
|
|
if (data_offset + num_bytes >= ino_size)
|
|
backref_ctx->extent_len = ino_size - data_offset;
|
|
|
|
/*
|
|
* Now collect all backrefs.
|
|
*/
|
|
if (compressed == BTRFS_COMPRESS_NONE)
|
|
extent_item_pos = logical - found_key.objectid;
|
|
else
|
|
extent_item_pos = 0;
|
|
|
|
extent_item_pos = logical - found_key.objectid;
|
|
ret = iterate_extent_inodes(sctx->send_root->fs_info,
|
|
found_key.objectid, extent_item_pos, 1,
|
|
__iterate_backrefs, backref_ctx);
|
|
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (!backref_ctx->found_itself) {
|
|
/* found a bug in backref code? */
|
|
ret = -EIO;
|
|
printk(KERN_ERR "btrfs: ERROR did not find backref in "
|
|
"send_root. inode=%llu, offset=%llu, "
|
|
"disk_byte=%llu found extent=%llu\n",
|
|
ino, data_offset, disk_byte, found_key.objectid);
|
|
goto out;
|
|
}
|
|
|
|
verbose_printk(KERN_DEBUG "btrfs: find_extent_clone: data_offset=%llu, "
|
|
"ino=%llu, "
|
|
"num_bytes=%llu, logical=%llu\n",
|
|
data_offset, ino, num_bytes, logical);
|
|
|
|
if (!backref_ctx->found)
|
|
verbose_printk("btrfs: no clones found\n");
|
|
|
|
cur_clone_root = NULL;
|
|
for (i = 0; i < sctx->clone_roots_cnt; i++) {
|
|
if (sctx->clone_roots[i].found_refs) {
|
|
if (!cur_clone_root)
|
|
cur_clone_root = sctx->clone_roots + i;
|
|
else if (sctx->clone_roots[i].root == sctx->send_root)
|
|
/* prefer clones from send_root over others */
|
|
cur_clone_root = sctx->clone_roots + i;
|
|
}
|
|
|
|
}
|
|
|
|
if (cur_clone_root) {
|
|
*found = cur_clone_root;
|
|
ret = 0;
|
|
} else {
|
|
ret = -ENOENT;
|
|
}
|
|
|
|
out:
|
|
btrfs_free_path(tmp_path);
|
|
kfree(backref_ctx);
|
|
return ret;
|
|
}
|
|
|
|
static int read_symlink(struct send_ctx *sctx,
|
|
struct btrfs_root *root,
|
|
u64 ino,
|
|
struct fs_path *dest)
|
|
{
|
|
int ret;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
struct btrfs_file_extent_item *ei;
|
|
u8 type;
|
|
u8 compression;
|
|
unsigned long off;
|
|
int len;
|
|
|
|
path = alloc_path_for_send();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
key.objectid = ino;
|
|
key.type = BTRFS_EXTENT_DATA_KEY;
|
|
key.offset = 0;
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
BUG_ON(ret);
|
|
|
|
ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
|
|
struct btrfs_file_extent_item);
|
|
type = btrfs_file_extent_type(path->nodes[0], ei);
|
|
compression = btrfs_file_extent_compression(path->nodes[0], ei);
|
|
BUG_ON(type != BTRFS_FILE_EXTENT_INLINE);
|
|
BUG_ON(compression);
|
|
|
|
off = btrfs_file_extent_inline_start(ei);
|
|
len = btrfs_file_extent_inline_len(path->nodes[0], ei);
|
|
|
|
ret = fs_path_add_from_extent_buffer(dest, path->nodes[0], off, len);
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Helper function to generate a file name that is unique in the root of
|
|
* send_root and parent_root. This is used to generate names for orphan inodes.
|
|
*/
|
|
static int gen_unique_name(struct send_ctx *sctx,
|
|
u64 ino, u64 gen,
|
|
struct fs_path *dest)
|
|
{
|
|
int ret = 0;
|
|
struct btrfs_path *path;
|
|
struct btrfs_dir_item *di;
|
|
char tmp[64];
|
|
int len;
|
|
u64 idx = 0;
|
|
|
|
path = alloc_path_for_send();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
while (1) {
|
|
len = snprintf(tmp, sizeof(tmp) - 1, "o%llu-%llu-%llu",
|
|
ino, gen, idx);
|
|
if (len >= sizeof(tmp)) {
|
|
/* should really not happen */
|
|
ret = -EOVERFLOW;
|
|
goto out;
|
|
}
|
|
|
|
di = btrfs_lookup_dir_item(NULL, sctx->send_root,
|
|
path, BTRFS_FIRST_FREE_OBJECTID,
|
|
tmp, strlen(tmp), 0);
|
|
btrfs_release_path(path);
|
|
if (IS_ERR(di)) {
|
|
ret = PTR_ERR(di);
|
|
goto out;
|
|
}
|
|
if (di) {
|
|
/* not unique, try again */
|
|
idx++;
|
|
continue;
|
|
}
|
|
|
|
if (!sctx->parent_root) {
|
|
/* unique */
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
di = btrfs_lookup_dir_item(NULL, sctx->parent_root,
|
|
path, BTRFS_FIRST_FREE_OBJECTID,
|
|
tmp, strlen(tmp), 0);
|
|
btrfs_release_path(path);
|
|
if (IS_ERR(di)) {
|
|
ret = PTR_ERR(di);
|
|
goto out;
|
|
}
|
|
if (di) {
|
|
/* not unique, try again */
|
|
idx++;
|
|
continue;
|
|
}
|
|
/* unique */
|
|
break;
|
|
}
|
|
|
|
ret = fs_path_add(dest, tmp, strlen(tmp));
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
enum inode_state {
|
|
inode_state_no_change,
|
|
inode_state_will_create,
|
|
inode_state_did_create,
|
|
inode_state_will_delete,
|
|
inode_state_did_delete,
|
|
};
|
|
|
|
static int get_cur_inode_state(struct send_ctx *sctx, u64 ino, u64 gen)
|
|
{
|
|
int ret;
|
|
int left_ret;
|
|
int right_ret;
|
|
u64 left_gen;
|
|
u64 right_gen;
|
|
|
|
ret = get_inode_info(sctx->send_root, ino, NULL, &left_gen, NULL, NULL,
|
|
NULL, NULL);
|
|
if (ret < 0 && ret != -ENOENT)
|
|
goto out;
|
|
left_ret = ret;
|
|
|
|
if (!sctx->parent_root) {
|
|
right_ret = -ENOENT;
|
|
} else {
|
|
ret = get_inode_info(sctx->parent_root, ino, NULL, &right_gen,
|
|
NULL, NULL, NULL, NULL);
|
|
if (ret < 0 && ret != -ENOENT)
|
|
goto out;
|
|
right_ret = ret;
|
|
}
|
|
|
|
if (!left_ret && !right_ret) {
|
|
if (left_gen == gen && right_gen == gen) {
|
|
ret = inode_state_no_change;
|
|
} else if (left_gen == gen) {
|
|
if (ino < sctx->send_progress)
|
|
ret = inode_state_did_create;
|
|
else
|
|
ret = inode_state_will_create;
|
|
} else if (right_gen == gen) {
|
|
if (ino < sctx->send_progress)
|
|
ret = inode_state_did_delete;
|
|
else
|
|
ret = inode_state_will_delete;
|
|
} else {
|
|
ret = -ENOENT;
|
|
}
|
|
} else if (!left_ret) {
|
|
if (left_gen == gen) {
|
|
if (ino < sctx->send_progress)
|
|
ret = inode_state_did_create;
|
|
else
|
|
ret = inode_state_will_create;
|
|
} else {
|
|
ret = -ENOENT;
|
|
}
|
|
} else if (!right_ret) {
|
|
if (right_gen == gen) {
|
|
if (ino < sctx->send_progress)
|
|
ret = inode_state_did_delete;
|
|
else
|
|
ret = inode_state_will_delete;
|
|
} else {
|
|
ret = -ENOENT;
|
|
}
|
|
} else {
|
|
ret = -ENOENT;
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int is_inode_existent(struct send_ctx *sctx, u64 ino, u64 gen)
|
|
{
|
|
int ret;
|
|
|
|
ret = get_cur_inode_state(sctx, ino, gen);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (ret == inode_state_no_change ||
|
|
ret == inode_state_did_create ||
|
|
ret == inode_state_will_delete)
|
|
ret = 1;
|
|
else
|
|
ret = 0;
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Helper function to lookup a dir item in a dir.
|
|
*/
|
|
static int lookup_dir_item_inode(struct btrfs_root *root,
|
|
u64 dir, const char *name, int name_len,
|
|
u64 *found_inode,
|
|
u8 *found_type)
|
|
{
|
|
int ret = 0;
|
|
struct btrfs_dir_item *di;
|
|
struct btrfs_key key;
|
|
struct btrfs_path *path;
|
|
|
|
path = alloc_path_for_send();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
di = btrfs_lookup_dir_item(NULL, root, path,
|
|
dir, name, name_len, 0);
|
|
if (!di) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
if (IS_ERR(di)) {
|
|
ret = PTR_ERR(di);
|
|
goto out;
|
|
}
|
|
btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key);
|
|
*found_inode = key.objectid;
|
|
*found_type = btrfs_dir_type(path->nodes[0], di);
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Looks up the first btrfs_inode_ref of a given ino. It returns the parent dir,
|
|
* generation of the parent dir and the name of the dir entry.
|
|
*/
|
|
static int get_first_ref(struct send_ctx *sctx,
|
|
struct btrfs_root *root, u64 ino,
|
|
u64 *dir, u64 *dir_gen, struct fs_path *name)
|
|
{
|
|
int ret;
|
|
struct btrfs_key key;
|
|
struct btrfs_key found_key;
|
|
struct btrfs_path *path;
|
|
struct btrfs_inode_ref *iref;
|
|
int len;
|
|
|
|
path = alloc_path_for_send();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
key.objectid = ino;
|
|
key.type = BTRFS_INODE_REF_KEY;
|
|
key.offset = 0;
|
|
|
|
ret = btrfs_search_slot_for_read(root, &key, path, 1, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (!ret)
|
|
btrfs_item_key_to_cpu(path->nodes[0], &found_key,
|
|
path->slots[0]);
|
|
if (ret || found_key.objectid != key.objectid ||
|
|
found_key.type != key.type) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
iref = btrfs_item_ptr(path->nodes[0], path->slots[0],
|
|
struct btrfs_inode_ref);
|
|
len = btrfs_inode_ref_name_len(path->nodes[0], iref);
|
|
ret = fs_path_add_from_extent_buffer(name, path->nodes[0],
|
|
(unsigned long)(iref + 1), len);
|
|
if (ret < 0)
|
|
goto out;
|
|
btrfs_release_path(path);
|
|
|
|
ret = get_inode_info(root, found_key.offset, NULL, dir_gen, NULL, NULL,
|
|
NULL, NULL);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
*dir = found_key.offset;
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int is_first_ref(struct send_ctx *sctx,
|
|
struct btrfs_root *root,
|
|
u64 ino, u64 dir,
|
|
const char *name, int name_len)
|
|
{
|
|
int ret;
|
|
struct fs_path *tmp_name;
|
|
u64 tmp_dir;
|
|
u64 tmp_dir_gen;
|
|
|
|
tmp_name = fs_path_alloc(sctx);
|
|
if (!tmp_name)
|
|
return -ENOMEM;
|
|
|
|
ret = get_first_ref(sctx, root, ino, &tmp_dir, &tmp_dir_gen, tmp_name);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (dir != tmp_dir || name_len != fs_path_len(tmp_name)) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
ret = !memcmp(tmp_name->start, name, name_len);
|
|
|
|
out:
|
|
fs_path_free(sctx, tmp_name);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Used by process_recorded_refs to determine if a new ref would overwrite an
|
|
* already existing ref. In case it detects an overwrite, it returns the
|
|
* inode/gen in who_ino/who_gen.
|
|
* When an overwrite is detected, process_recorded_refs does proper orphanizing
|
|
* to make sure later references to the overwritten inode are possible.
|
|
* Orphanizing is however only required for the first ref of an inode.
|
|
* process_recorded_refs does an additional is_first_ref check to see if
|
|
* orphanizing is really required.
|
|
*/
|
|
static int will_overwrite_ref(struct send_ctx *sctx, u64 dir, u64 dir_gen,
|
|
const char *name, int name_len,
|
|
u64 *who_ino, u64 *who_gen)
|
|
{
|
|
int ret = 0;
|
|
u64 other_inode = 0;
|
|
u8 other_type = 0;
|
|
|
|
if (!sctx->parent_root)
|
|
goto out;
|
|
|
|
ret = is_inode_existent(sctx, dir, dir_gen);
|
|
if (ret <= 0)
|
|
goto out;
|
|
|
|
ret = lookup_dir_item_inode(sctx->parent_root, dir, name, name_len,
|
|
&other_inode, &other_type);
|
|
if (ret < 0 && ret != -ENOENT)
|
|
goto out;
|
|
if (ret) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Check if the overwritten ref was already processed. If yes, the ref
|
|
* was already unlinked/moved, so we can safely assume that we will not
|
|
* overwrite anything at this point in time.
|
|
*/
|
|
if (other_inode > sctx->send_progress) {
|
|
ret = get_inode_info(sctx->parent_root, other_inode, NULL,
|
|
who_gen, NULL, NULL, NULL, NULL);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = 1;
|
|
*who_ino = other_inode;
|
|
} else {
|
|
ret = 0;
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Checks if the ref was overwritten by an already processed inode. This is
|
|
* used by __get_cur_name_and_parent to find out if the ref was orphanized and
|
|
* thus the orphan name needs be used.
|
|
* process_recorded_refs also uses it to avoid unlinking of refs that were
|
|
* overwritten.
|
|
*/
|
|
static int did_overwrite_ref(struct send_ctx *sctx,
|
|
u64 dir, u64 dir_gen,
|
|
u64 ino, u64 ino_gen,
|
|
const char *name, int name_len)
|
|
{
|
|
int ret = 0;
|
|
u64 gen;
|
|
u64 ow_inode;
|
|
u8 other_type;
|
|
|
|
if (!sctx->parent_root)
|
|
goto out;
|
|
|
|
ret = is_inode_existent(sctx, dir, dir_gen);
|
|
if (ret <= 0)
|
|
goto out;
|
|
|
|
/* check if the ref was overwritten by another ref */
|
|
ret = lookup_dir_item_inode(sctx->send_root, dir, name, name_len,
|
|
&ow_inode, &other_type);
|
|
if (ret < 0 && ret != -ENOENT)
|
|
goto out;
|
|
if (ret) {
|
|
/* was never and will never be overwritten */
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
ret = get_inode_info(sctx->send_root, ow_inode, NULL, &gen, NULL, NULL,
|
|
NULL, NULL);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (ow_inode == ino && gen == ino_gen) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
/* we know that it is or will be overwritten. check this now */
|
|
if (ow_inode < sctx->send_progress)
|
|
ret = 1;
|
|
else
|
|
ret = 0;
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Same as did_overwrite_ref, but also checks if it is the first ref of an inode
|
|
* that got overwritten. This is used by process_recorded_refs to determine
|
|
* if it has to use the path as returned by get_cur_path or the orphan name.
|
|
*/
|
|
static int did_overwrite_first_ref(struct send_ctx *sctx, u64 ino, u64 gen)
|
|
{
|
|
int ret = 0;
|
|
struct fs_path *name = NULL;
|
|
u64 dir;
|
|
u64 dir_gen;
|
|
|
|
if (!sctx->parent_root)
|
|
goto out;
|
|
|
|
name = fs_path_alloc(sctx);
|
|
if (!name)
|
|
return -ENOMEM;
|
|
|
|
ret = get_first_ref(sctx, sctx->parent_root, ino, &dir, &dir_gen, name);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = did_overwrite_ref(sctx, dir, dir_gen, ino, gen,
|
|
name->start, fs_path_len(name));
|
|
|
|
out:
|
|
fs_path_free(sctx, name);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Insert a name cache entry. On 32bit kernels the radix tree index is 32bit,
|
|
* so we need to do some special handling in case we have clashes. This function
|
|
* takes care of this with the help of name_cache_entry::radix_list.
|
|
* In case of error, nce is kfreed.
|
|
*/
|
|
static int name_cache_insert(struct send_ctx *sctx,
|
|
struct name_cache_entry *nce)
|
|
{
|
|
int ret = 0;
|
|
struct list_head *nce_head;
|
|
|
|
nce_head = radix_tree_lookup(&sctx->name_cache,
|
|
(unsigned long)nce->ino);
|
|
if (!nce_head) {
|
|
nce_head = kmalloc(sizeof(*nce_head), GFP_NOFS);
|
|
if (!nce_head)
|
|
return -ENOMEM;
|
|
INIT_LIST_HEAD(nce_head);
|
|
|
|
ret = radix_tree_insert(&sctx->name_cache, nce->ino, nce_head);
|
|
if (ret < 0) {
|
|
kfree(nce_head);
|
|
kfree(nce);
|
|
return ret;
|
|
}
|
|
}
|
|
list_add_tail(&nce->radix_list, nce_head);
|
|
list_add_tail(&nce->list, &sctx->name_cache_list);
|
|
sctx->name_cache_size++;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void name_cache_delete(struct send_ctx *sctx,
|
|
struct name_cache_entry *nce)
|
|
{
|
|
struct list_head *nce_head;
|
|
|
|
nce_head = radix_tree_lookup(&sctx->name_cache,
|
|
(unsigned long)nce->ino);
|
|
BUG_ON(!nce_head);
|
|
|
|
list_del(&nce->radix_list);
|
|
list_del(&nce->list);
|
|
sctx->name_cache_size--;
|
|
|
|
if (list_empty(nce_head)) {
|
|
radix_tree_delete(&sctx->name_cache, (unsigned long)nce->ino);
|
|
kfree(nce_head);
|
|
}
|
|
}
|
|
|
|
static struct name_cache_entry *name_cache_search(struct send_ctx *sctx,
|
|
u64 ino, u64 gen)
|
|
{
|
|
struct list_head *nce_head;
|
|
struct name_cache_entry *cur;
|
|
|
|
nce_head = radix_tree_lookup(&sctx->name_cache, (unsigned long)ino);
|
|
if (!nce_head)
|
|
return NULL;
|
|
|
|
list_for_each_entry(cur, nce_head, radix_list) {
|
|
if (cur->ino == ino && cur->gen == gen)
|
|
return cur;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Removes the entry from the list and adds it back to the end. This marks the
|
|
* entry as recently used so that name_cache_clean_unused does not remove it.
|
|
*/
|
|
static void name_cache_used(struct send_ctx *sctx, struct name_cache_entry *nce)
|
|
{
|
|
list_del(&nce->list);
|
|
list_add_tail(&nce->list, &sctx->name_cache_list);
|
|
}
|
|
|
|
/*
|
|
* Remove some entries from the beginning of name_cache_list.
|
|
*/
|
|
static void name_cache_clean_unused(struct send_ctx *sctx)
|
|
{
|
|
struct name_cache_entry *nce;
|
|
|
|
if (sctx->name_cache_size < SEND_CTX_NAME_CACHE_CLEAN_SIZE)
|
|
return;
|
|
|
|
while (sctx->name_cache_size > SEND_CTX_MAX_NAME_CACHE_SIZE) {
|
|
nce = list_entry(sctx->name_cache_list.next,
|
|
struct name_cache_entry, list);
|
|
name_cache_delete(sctx, nce);
|
|
kfree(nce);
|
|
}
|
|
}
|
|
|
|
static void name_cache_free(struct send_ctx *sctx)
|
|
{
|
|
struct name_cache_entry *nce;
|
|
|
|
while (!list_empty(&sctx->name_cache_list)) {
|
|
nce = list_entry(sctx->name_cache_list.next,
|
|
struct name_cache_entry, list);
|
|
name_cache_delete(sctx, nce);
|
|
kfree(nce);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Used by get_cur_path for each ref up to the root.
|
|
* Returns 0 if it succeeded.
|
|
* Returns 1 if the inode is not existent or got overwritten. In that case, the
|
|
* name is an orphan name. This instructs get_cur_path to stop iterating. If 1
|
|
* is returned, parent_ino/parent_gen are not guaranteed to be valid.
|
|
* Returns <0 in case of error.
|
|
*/
|
|
static int __get_cur_name_and_parent(struct send_ctx *sctx,
|
|
u64 ino, u64 gen,
|
|
u64 *parent_ino,
|
|
u64 *parent_gen,
|
|
struct fs_path *dest)
|
|
{
|
|
int ret;
|
|
int nce_ret;
|
|
struct btrfs_path *path = NULL;
|
|
struct name_cache_entry *nce = NULL;
|
|
|
|
/*
|
|
* First check if we already did a call to this function with the same
|
|
* ino/gen. If yes, check if the cache entry is still up-to-date. If yes
|
|
* return the cached result.
|
|
*/
|
|
nce = name_cache_search(sctx, ino, gen);
|
|
if (nce) {
|
|
if (ino < sctx->send_progress && nce->need_later_update) {
|
|
name_cache_delete(sctx, nce);
|
|
kfree(nce);
|
|
nce = NULL;
|
|
} else {
|
|
name_cache_used(sctx, nce);
|
|
*parent_ino = nce->parent_ino;
|
|
*parent_gen = nce->parent_gen;
|
|
ret = fs_path_add(dest, nce->name, nce->name_len);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = nce->ret;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
path = alloc_path_for_send();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* If the inode is not existent yet, add the orphan name and return 1.
|
|
* This should only happen for the parent dir that we determine in
|
|
* __record_new_ref
|
|
*/
|
|
ret = is_inode_existent(sctx, ino, gen);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (!ret) {
|
|
ret = gen_unique_name(sctx, ino, gen, dest);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = 1;
|
|
goto out_cache;
|
|
}
|
|
|
|
/*
|
|
* Depending on whether the inode was already processed or not, use
|
|
* send_root or parent_root for ref lookup.
|
|
*/
|
|
if (ino < sctx->send_progress)
|
|
ret = get_first_ref(sctx, sctx->send_root, ino,
|
|
parent_ino, parent_gen, dest);
|
|
else
|
|
ret = get_first_ref(sctx, sctx->parent_root, ino,
|
|
parent_ino, parent_gen, dest);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/*
|
|
* Check if the ref was overwritten by an inode's ref that was processed
|
|
* earlier. If yes, treat as orphan and return 1.
|
|
*/
|
|
ret = did_overwrite_ref(sctx, *parent_ino, *parent_gen, ino, gen,
|
|
dest->start, dest->end - dest->start);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret) {
|
|
fs_path_reset(dest);
|
|
ret = gen_unique_name(sctx, ino, gen, dest);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = 1;
|
|
}
|
|
|
|
out_cache:
|
|
/*
|
|
* Store the result of the lookup in the name cache.
|
|
*/
|
|
nce = kmalloc(sizeof(*nce) + fs_path_len(dest) + 1, GFP_NOFS);
|
|
if (!nce) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
nce->ino = ino;
|
|
nce->gen = gen;
|
|
nce->parent_ino = *parent_ino;
|
|
nce->parent_gen = *parent_gen;
|
|
nce->name_len = fs_path_len(dest);
|
|
nce->ret = ret;
|
|
strcpy(nce->name, dest->start);
|
|
|
|
if (ino < sctx->send_progress)
|
|
nce->need_later_update = 0;
|
|
else
|
|
nce->need_later_update = 1;
|
|
|
|
nce_ret = name_cache_insert(sctx, nce);
|
|
if (nce_ret < 0)
|
|
ret = nce_ret;
|
|
name_cache_clean_unused(sctx);
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Magic happens here. This function returns the first ref to an inode as it
|
|
* would look like while receiving the stream at this point in time.
|
|
* We walk the path up to the root. For every inode in between, we check if it
|
|
* was already processed/sent. If yes, we continue with the parent as found
|
|
* in send_root. If not, we continue with the parent as found in parent_root.
|
|
* If we encounter an inode that was deleted at this point in time, we use the
|
|
* inodes "orphan" name instead of the real name and stop. Same with new inodes
|
|
* that were not created yet and overwritten inodes/refs.
|
|
*
|
|
* When do we have have orphan inodes:
|
|
* 1. When an inode is freshly created and thus no valid refs are available yet
|
|
* 2. When a directory lost all it's refs (deleted) but still has dir items
|
|
* inside which were not processed yet (pending for move/delete). If anyone
|
|
* tried to get the path to the dir items, it would get a path inside that
|
|
* orphan directory.
|
|
* 3. When an inode is moved around or gets new links, it may overwrite the ref
|
|
* of an unprocessed inode. If in that case the first ref would be
|
|
* overwritten, the overwritten inode gets "orphanized". Later when we
|
|
* process this overwritten inode, it is restored at a new place by moving
|
|
* the orphan inode.
|
|
*
|
|
* sctx->send_progress tells this function at which point in time receiving
|
|
* would be.
|
|
*/
|
|
static int get_cur_path(struct send_ctx *sctx, u64 ino, u64 gen,
|
|
struct fs_path *dest)
|
|
{
|
|
int ret = 0;
|
|
struct fs_path *name = NULL;
|
|
u64 parent_inode = 0;
|
|
u64 parent_gen = 0;
|
|
int stop = 0;
|
|
|
|
name = fs_path_alloc(sctx);
|
|
if (!name) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
dest->reversed = 1;
|
|
fs_path_reset(dest);
|
|
|
|
while (!stop && ino != BTRFS_FIRST_FREE_OBJECTID) {
|
|
fs_path_reset(name);
|
|
|
|
ret = __get_cur_name_and_parent(sctx, ino, gen,
|
|
&parent_inode, &parent_gen, name);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret)
|
|
stop = 1;
|
|
|
|
ret = fs_path_add_path(dest, name);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ino = parent_inode;
|
|
gen = parent_gen;
|
|
}
|
|
|
|
out:
|
|
fs_path_free(sctx, name);
|
|
if (!ret)
|
|
fs_path_unreverse(dest);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Called for regular files when sending extents data. Opens a struct file
|
|
* to read from the file.
|
|
*/
|
|
static int open_cur_inode_file(struct send_ctx *sctx)
|
|
{
|
|
int ret = 0;
|
|
struct btrfs_key key;
|
|
struct path path;
|
|
struct inode *inode;
|
|
struct dentry *dentry;
|
|
struct file *filp;
|
|
int new = 0;
|
|
|
|
if (sctx->cur_inode_filp)
|
|
goto out;
|
|
|
|
key.objectid = sctx->cur_ino;
|
|
key.type = BTRFS_INODE_ITEM_KEY;
|
|
key.offset = 0;
|
|
|
|
inode = btrfs_iget(sctx->send_root->fs_info->sb, &key, sctx->send_root,
|
|
&new);
|
|
if (IS_ERR(inode)) {
|
|
ret = PTR_ERR(inode);
|
|
goto out;
|
|
}
|
|
|
|
dentry = d_obtain_alias(inode);
|
|
inode = NULL;
|
|
if (IS_ERR(dentry)) {
|
|
ret = PTR_ERR(dentry);
|
|
goto out;
|
|
}
|
|
|
|
path.mnt = sctx->mnt;
|
|
path.dentry = dentry;
|
|
filp = dentry_open(&path, O_RDONLY | O_LARGEFILE, current_cred());
|
|
dput(dentry);
|
|
dentry = NULL;
|
|
if (IS_ERR(filp)) {
|
|
ret = PTR_ERR(filp);
|
|
goto out;
|
|
}
|
|
sctx->cur_inode_filp = filp;
|
|
|
|
out:
|
|
/*
|
|
* no xxxput required here as every vfs op
|
|
* does it by itself on failure
|
|
*/
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Closes the struct file that was created in open_cur_inode_file
|
|
*/
|
|
static int close_cur_inode_file(struct send_ctx *sctx)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!sctx->cur_inode_filp)
|
|
goto out;
|
|
|
|
ret = filp_close(sctx->cur_inode_filp, NULL);
|
|
sctx->cur_inode_filp = NULL;
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Sends a BTRFS_SEND_C_SUBVOL command/item to userspace
|
|
*/
|
|
static int send_subvol_begin(struct send_ctx *sctx)
|
|
{
|
|
int ret;
|
|
struct btrfs_root *send_root = sctx->send_root;
|
|
struct btrfs_root *parent_root = sctx->parent_root;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
struct btrfs_root_ref *ref;
|
|
struct extent_buffer *leaf;
|
|
char *name = NULL;
|
|
int namelen;
|
|
|
|
path = alloc_path_for_send();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
name = kmalloc(BTRFS_PATH_NAME_MAX, GFP_NOFS);
|
|
if (!name) {
|
|
btrfs_free_path(path);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
key.objectid = send_root->objectid;
|
|
key.type = BTRFS_ROOT_BACKREF_KEY;
|
|
key.offset = 0;
|
|
|
|
ret = btrfs_search_slot_for_read(send_root->fs_info->tree_root,
|
|
&key, path, 1, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
|
|
if (key.type != BTRFS_ROOT_BACKREF_KEY ||
|
|
key.objectid != send_root->objectid) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_ref);
|
|
namelen = btrfs_root_ref_name_len(leaf, ref);
|
|
read_extent_buffer(leaf, name, (unsigned long)(ref + 1), namelen);
|
|
btrfs_release_path(path);
|
|
|
|
if (parent_root) {
|
|
ret = begin_cmd(sctx, BTRFS_SEND_C_SNAPSHOT);
|
|
if (ret < 0)
|
|
goto out;
|
|
} else {
|
|
ret = begin_cmd(sctx, BTRFS_SEND_C_SUBVOL);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
TLV_PUT_STRING(sctx, BTRFS_SEND_A_PATH, name, namelen);
|
|
TLV_PUT_UUID(sctx, BTRFS_SEND_A_UUID,
|
|
sctx->send_root->root_item.uuid);
|
|
TLV_PUT_U64(sctx, BTRFS_SEND_A_CTRANSID,
|
|
sctx->send_root->root_item.ctransid);
|
|
if (parent_root) {
|
|
TLV_PUT_UUID(sctx, BTRFS_SEND_A_CLONE_UUID,
|
|
sctx->parent_root->root_item.uuid);
|
|
TLV_PUT_U64(sctx, BTRFS_SEND_A_CLONE_CTRANSID,
|
|
sctx->parent_root->root_item.ctransid);
|
|
}
|
|
|
|
ret = send_cmd(sctx);
|
|
|
|
tlv_put_failure:
|
|
out:
|
|
btrfs_free_path(path);
|
|
kfree(name);
|
|
return ret;
|
|
}
|
|
|
|
static int send_truncate(struct send_ctx *sctx, u64 ino, u64 gen, u64 size)
|
|
{
|
|
int ret = 0;
|
|
struct fs_path *p;
|
|
|
|
verbose_printk("btrfs: send_truncate %llu size=%llu\n", ino, size);
|
|
|
|
p = fs_path_alloc(sctx);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
ret = begin_cmd(sctx, BTRFS_SEND_C_TRUNCATE);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = get_cur_path(sctx, ino, gen, p);
|
|
if (ret < 0)
|
|
goto out;
|
|
TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, p);
|
|
TLV_PUT_U64(sctx, BTRFS_SEND_A_SIZE, size);
|
|
|
|
ret = send_cmd(sctx);
|
|
|
|
tlv_put_failure:
|
|
out:
|
|
fs_path_free(sctx, p);
|
|
return ret;
|
|
}
|
|
|
|
static int send_chmod(struct send_ctx *sctx, u64 ino, u64 gen, u64 mode)
|
|
{
|
|
int ret = 0;
|
|
struct fs_path *p;
|
|
|
|
verbose_printk("btrfs: send_chmod %llu mode=%llu\n", ino, mode);
|
|
|
|
p = fs_path_alloc(sctx);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
ret = begin_cmd(sctx, BTRFS_SEND_C_CHMOD);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = get_cur_path(sctx, ino, gen, p);
|
|
if (ret < 0)
|
|
goto out;
|
|
TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, p);
|
|
TLV_PUT_U64(sctx, BTRFS_SEND_A_MODE, mode & 07777);
|
|
|
|
ret = send_cmd(sctx);
|
|
|
|
tlv_put_failure:
|
|
out:
|
|
fs_path_free(sctx, p);
|
|
return ret;
|
|
}
|
|
|
|
static int send_chown(struct send_ctx *sctx, u64 ino, u64 gen, u64 uid, u64 gid)
|
|
{
|
|
int ret = 0;
|
|
struct fs_path *p;
|
|
|
|
verbose_printk("btrfs: send_chown %llu uid=%llu, gid=%llu\n", ino, uid, gid);
|
|
|
|
p = fs_path_alloc(sctx);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
ret = begin_cmd(sctx, BTRFS_SEND_C_CHOWN);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = get_cur_path(sctx, ino, gen, p);
|
|
if (ret < 0)
|
|
goto out;
|
|
TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, p);
|
|
TLV_PUT_U64(sctx, BTRFS_SEND_A_UID, uid);
|
|
TLV_PUT_U64(sctx, BTRFS_SEND_A_GID, gid);
|
|
|
|
ret = send_cmd(sctx);
|
|
|
|
tlv_put_failure:
|
|
out:
|
|
fs_path_free(sctx, p);
|
|
return ret;
|
|
}
|
|
|
|
static int send_utimes(struct send_ctx *sctx, u64 ino, u64 gen)
|
|
{
|
|
int ret = 0;
|
|
struct fs_path *p = NULL;
|
|
struct btrfs_inode_item *ii;
|
|
struct btrfs_path *path = NULL;
|
|
struct extent_buffer *eb;
|
|
struct btrfs_key key;
|
|
int slot;
|
|
|
|
verbose_printk("btrfs: send_utimes %llu\n", ino);
|
|
|
|
p = fs_path_alloc(sctx);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
path = alloc_path_for_send();
|
|
if (!path) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
key.objectid = ino;
|
|
key.type = BTRFS_INODE_ITEM_KEY;
|
|
key.offset = 0;
|
|
ret = btrfs_search_slot(NULL, sctx->send_root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
eb = path->nodes[0];
|
|
slot = path->slots[0];
|
|
ii = btrfs_item_ptr(eb, slot, struct btrfs_inode_item);
|
|
|
|
ret = begin_cmd(sctx, BTRFS_SEND_C_UTIMES);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = get_cur_path(sctx, ino, gen, p);
|
|
if (ret < 0)
|
|
goto out;
|
|
TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, p);
|
|
TLV_PUT_BTRFS_TIMESPEC(sctx, BTRFS_SEND_A_ATIME, eb,
|
|
btrfs_inode_atime(ii));
|
|
TLV_PUT_BTRFS_TIMESPEC(sctx, BTRFS_SEND_A_MTIME, eb,
|
|
btrfs_inode_mtime(ii));
|
|
TLV_PUT_BTRFS_TIMESPEC(sctx, BTRFS_SEND_A_CTIME, eb,
|
|
btrfs_inode_ctime(ii));
|
|
/* TODO Add otime support when the otime patches get into upstream */
|
|
|
|
ret = send_cmd(sctx);
|
|
|
|
tlv_put_failure:
|
|
out:
|
|
fs_path_free(sctx, p);
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Sends a BTRFS_SEND_C_MKXXX or SYMLINK command to user space. We don't have
|
|
* a valid path yet because we did not process the refs yet. So, the inode
|
|
* is created as orphan.
|
|
*/
|
|
static int send_create_inode(struct send_ctx *sctx, u64 ino)
|
|
{
|
|
int ret = 0;
|
|
struct fs_path *p;
|
|
int cmd;
|
|
u64 gen;
|
|
u64 mode;
|
|
u64 rdev;
|
|
|
|
verbose_printk("btrfs: send_create_inode %llu\n", ino);
|
|
|
|
p = fs_path_alloc(sctx);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
ret = get_inode_info(sctx->send_root, ino, NULL, &gen, &mode, NULL,
|
|
NULL, &rdev);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (S_ISREG(mode)) {
|
|
cmd = BTRFS_SEND_C_MKFILE;
|
|
} else if (S_ISDIR(mode)) {
|
|
cmd = BTRFS_SEND_C_MKDIR;
|
|
} else if (S_ISLNK(mode)) {
|
|
cmd = BTRFS_SEND_C_SYMLINK;
|
|
} else if (S_ISCHR(mode) || S_ISBLK(mode)) {
|
|
cmd = BTRFS_SEND_C_MKNOD;
|
|
} else if (S_ISFIFO(mode)) {
|
|
cmd = BTRFS_SEND_C_MKFIFO;
|
|
} else if (S_ISSOCK(mode)) {
|
|
cmd = BTRFS_SEND_C_MKSOCK;
|
|
} else {
|
|
printk(KERN_WARNING "btrfs: unexpected inode type %o",
|
|
(int)(mode & S_IFMT));
|
|
ret = -ENOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
ret = begin_cmd(sctx, cmd);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = gen_unique_name(sctx, ino, gen, p);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, p);
|
|
TLV_PUT_U64(sctx, BTRFS_SEND_A_INO, ino);
|
|
|
|
if (S_ISLNK(mode)) {
|
|
fs_path_reset(p);
|
|
ret = read_symlink(sctx, sctx->send_root, ino, p);
|
|
if (ret < 0)
|
|
goto out;
|
|
TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH_LINK, p);
|
|
} else if (S_ISCHR(mode) || S_ISBLK(mode) ||
|
|
S_ISFIFO(mode) || S_ISSOCK(mode)) {
|
|
TLV_PUT_U64(sctx, BTRFS_SEND_A_RDEV, rdev);
|
|
}
|
|
|
|
ret = send_cmd(sctx);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
|
|
tlv_put_failure:
|
|
out:
|
|
fs_path_free(sctx, p);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* We need some special handling for inodes that get processed before the parent
|
|
* directory got created. See process_recorded_refs for details.
|
|
* This function does the check if we already created the dir out of order.
|
|
*/
|
|
static int did_create_dir(struct send_ctx *sctx, u64 dir)
|
|
{
|
|
int ret = 0;
|
|
struct btrfs_path *path = NULL;
|
|
struct btrfs_key key;
|
|
struct btrfs_key found_key;
|
|
struct btrfs_key di_key;
|
|
struct extent_buffer *eb;
|
|
struct btrfs_dir_item *di;
|
|
int slot;
|
|
|
|
path = alloc_path_for_send();
|
|
if (!path) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
key.objectid = dir;
|
|
key.type = BTRFS_DIR_INDEX_KEY;
|
|
key.offset = 0;
|
|
while (1) {
|
|
ret = btrfs_search_slot_for_read(sctx->send_root, &key, path,
|
|
1, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (!ret) {
|
|
eb = path->nodes[0];
|
|
slot = path->slots[0];
|
|
btrfs_item_key_to_cpu(eb, &found_key, slot);
|
|
}
|
|
if (ret || found_key.objectid != key.objectid ||
|
|
found_key.type != key.type) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
di = btrfs_item_ptr(eb, slot, struct btrfs_dir_item);
|
|
btrfs_dir_item_key_to_cpu(eb, di, &di_key);
|
|
|
|
if (di_key.objectid < sctx->send_progress) {
|
|
ret = 1;
|
|
goto out;
|
|
}
|
|
|
|
key.offset = found_key.offset + 1;
|
|
btrfs_release_path(path);
|
|
}
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Only creates the inode if it is:
|
|
* 1. Not a directory
|
|
* 2. Or a directory which was not created already due to out of order
|
|
* directories. See did_create_dir and process_recorded_refs for details.
|
|
*/
|
|
static int send_create_inode_if_needed(struct send_ctx *sctx)
|
|
{
|
|
int ret;
|
|
|
|
if (S_ISDIR(sctx->cur_inode_mode)) {
|
|
ret = did_create_dir(sctx, sctx->cur_ino);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ret = send_create_inode(sctx, sctx->cur_ino);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
struct recorded_ref {
|
|
struct list_head list;
|
|
char *dir_path;
|
|
char *name;
|
|
struct fs_path *full_path;
|
|
u64 dir;
|
|
u64 dir_gen;
|
|
int dir_path_len;
|
|
int name_len;
|
|
};
|
|
|
|
/*
|
|
* We need to process new refs before deleted refs, but compare_tree gives us
|
|
* everything mixed. So we first record all refs and later process them.
|
|
* This function is a helper to record one ref.
|
|
*/
|
|
static int record_ref(struct list_head *head, u64 dir,
|
|
u64 dir_gen, struct fs_path *path)
|
|
{
|
|
struct recorded_ref *ref;
|
|
char *tmp;
|
|
|
|
ref = kmalloc(sizeof(*ref), GFP_NOFS);
|
|
if (!ref)
|
|
return -ENOMEM;
|
|
|
|
ref->dir = dir;
|
|
ref->dir_gen = dir_gen;
|
|
ref->full_path = path;
|
|
|
|
tmp = strrchr(ref->full_path->start, '/');
|
|
if (!tmp) {
|
|
ref->name_len = ref->full_path->end - ref->full_path->start;
|
|
ref->name = ref->full_path->start;
|
|
ref->dir_path_len = 0;
|
|
ref->dir_path = ref->full_path->start;
|
|
} else {
|
|
tmp++;
|
|
ref->name_len = ref->full_path->end - tmp;
|
|
ref->name = tmp;
|
|
ref->dir_path = ref->full_path->start;
|
|
ref->dir_path_len = ref->full_path->end -
|
|
ref->full_path->start - 1 - ref->name_len;
|
|
}
|
|
|
|
list_add_tail(&ref->list, head);
|
|
return 0;
|
|
}
|
|
|
|
static void __free_recorded_refs(struct send_ctx *sctx, struct list_head *head)
|
|
{
|
|
struct recorded_ref *cur;
|
|
|
|
while (!list_empty(head)) {
|
|
cur = list_entry(head->next, struct recorded_ref, list);
|
|
fs_path_free(sctx, cur->full_path);
|
|
list_del(&cur->list);
|
|
kfree(cur);
|
|
}
|
|
}
|
|
|
|
static void free_recorded_refs(struct send_ctx *sctx)
|
|
{
|
|
__free_recorded_refs(sctx, &sctx->new_refs);
|
|
__free_recorded_refs(sctx, &sctx->deleted_refs);
|
|
}
|
|
|
|
/*
|
|
* Renames/moves a file/dir to its orphan name. Used when the first
|
|
* ref of an unprocessed inode gets overwritten and for all non empty
|
|
* directories.
|
|
*/
|
|
static int orphanize_inode(struct send_ctx *sctx, u64 ino, u64 gen,
|
|
struct fs_path *path)
|
|
{
|
|
int ret;
|
|
struct fs_path *orphan;
|
|
|
|
orphan = fs_path_alloc(sctx);
|
|
if (!orphan)
|
|
return -ENOMEM;
|
|
|
|
ret = gen_unique_name(sctx, ino, gen, orphan);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = send_rename(sctx, path, orphan);
|
|
|
|
out:
|
|
fs_path_free(sctx, orphan);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Returns 1 if a directory can be removed at this point in time.
|
|
* We check this by iterating all dir items and checking if the inode behind
|
|
* the dir item was already processed.
|
|
*/
|
|
static int can_rmdir(struct send_ctx *sctx, u64 dir, u64 send_progress)
|
|
{
|
|
int ret = 0;
|
|
struct btrfs_root *root = sctx->parent_root;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
struct btrfs_key found_key;
|
|
struct btrfs_key loc;
|
|
struct btrfs_dir_item *di;
|
|
|
|
/*
|
|
* Don't try to rmdir the top/root subvolume dir.
|
|
*/
|
|
if (dir == BTRFS_FIRST_FREE_OBJECTID)
|
|
return 0;
|
|
|
|
path = alloc_path_for_send();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
key.objectid = dir;
|
|
key.type = BTRFS_DIR_INDEX_KEY;
|
|
key.offset = 0;
|
|
|
|
while (1) {
|
|
ret = btrfs_search_slot_for_read(root, &key, path, 1, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (!ret) {
|
|
btrfs_item_key_to_cpu(path->nodes[0], &found_key,
|
|
path->slots[0]);
|
|
}
|
|
if (ret || found_key.objectid != key.objectid ||
|
|
found_key.type != key.type) {
|
|
break;
|
|
}
|
|
|
|
di = btrfs_item_ptr(path->nodes[0], path->slots[0],
|
|
struct btrfs_dir_item);
|
|
btrfs_dir_item_key_to_cpu(path->nodes[0], di, &loc);
|
|
|
|
if (loc.objectid > send_progress) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
btrfs_release_path(path);
|
|
key.offset = found_key.offset + 1;
|
|
}
|
|
|
|
ret = 1;
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This does all the move/link/unlink/rmdir magic.
|
|
*/
|
|
static int process_recorded_refs(struct send_ctx *sctx)
|
|
{
|
|
int ret = 0;
|
|
struct recorded_ref *cur;
|
|
struct recorded_ref *cur2;
|
|
struct ulist *check_dirs = NULL;
|
|
struct ulist_iterator uit;
|
|
struct ulist_node *un;
|
|
struct fs_path *valid_path = NULL;
|
|
u64 ow_inode = 0;
|
|
u64 ow_gen;
|
|
int did_overwrite = 0;
|
|
int is_orphan = 0;
|
|
|
|
verbose_printk("btrfs: process_recorded_refs %llu\n", sctx->cur_ino);
|
|
|
|
/*
|
|
* This should never happen as the root dir always has the same ref
|
|
* which is always '..'
|
|
*/
|
|
BUG_ON(sctx->cur_ino <= BTRFS_FIRST_FREE_OBJECTID);
|
|
|
|
valid_path = fs_path_alloc(sctx);
|
|
if (!valid_path) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
check_dirs = ulist_alloc(GFP_NOFS);
|
|
if (!check_dirs) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* First, check if the first ref of the current inode was overwritten
|
|
* before. If yes, we know that the current inode was already orphanized
|
|
* and thus use the orphan name. If not, we can use get_cur_path to
|
|
* get the path of the first ref as it would like while receiving at
|
|
* this point in time.
|
|
* New inodes are always orphan at the beginning, so force to use the
|
|
* orphan name in this case.
|
|
* The first ref is stored in valid_path and will be updated if it
|
|
* gets moved around.
|
|
*/
|
|
if (!sctx->cur_inode_new) {
|
|
ret = did_overwrite_first_ref(sctx, sctx->cur_ino,
|
|
sctx->cur_inode_gen);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret)
|
|
did_overwrite = 1;
|
|
}
|
|
if (sctx->cur_inode_new || did_overwrite) {
|
|
ret = gen_unique_name(sctx, sctx->cur_ino,
|
|
sctx->cur_inode_gen, valid_path);
|
|
if (ret < 0)
|
|
goto out;
|
|
is_orphan = 1;
|
|
} else {
|
|
ret = get_cur_path(sctx, sctx->cur_ino, sctx->cur_inode_gen,
|
|
valid_path);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
list_for_each_entry(cur, &sctx->new_refs, list) {
|
|
/*
|
|
* We may have refs where the parent directory does not exist
|
|
* yet. This happens if the parent directories inum is higher
|
|
* the the current inum. To handle this case, we create the
|
|
* parent directory out of order. But we need to check if this
|
|
* did already happen before due to other refs in the same dir.
|
|
*/
|
|
ret = get_cur_inode_state(sctx, cur->dir, cur->dir_gen);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret == inode_state_will_create) {
|
|
ret = 0;
|
|
/*
|
|
* First check if any of the current inodes refs did
|
|
* already create the dir.
|
|
*/
|
|
list_for_each_entry(cur2, &sctx->new_refs, list) {
|
|
if (cur == cur2)
|
|
break;
|
|
if (cur2->dir == cur->dir) {
|
|
ret = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If that did not happen, check if a previous inode
|
|
* did already create the dir.
|
|
*/
|
|
if (!ret)
|
|
ret = did_create_dir(sctx, cur->dir);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (!ret) {
|
|
ret = send_create_inode(sctx, cur->dir);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check if this new ref would overwrite the first ref of
|
|
* another unprocessed inode. If yes, orphanize the
|
|
* overwritten inode. If we find an overwritten ref that is
|
|
* not the first ref, simply unlink it.
|
|
*/
|
|
ret = will_overwrite_ref(sctx, cur->dir, cur->dir_gen,
|
|
cur->name, cur->name_len,
|
|
&ow_inode, &ow_gen);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret) {
|
|
ret = is_first_ref(sctx, sctx->parent_root,
|
|
ow_inode, cur->dir, cur->name,
|
|
cur->name_len);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret) {
|
|
ret = orphanize_inode(sctx, ow_inode, ow_gen,
|
|
cur->full_path);
|
|
if (ret < 0)
|
|
goto out;
|
|
} else {
|
|
ret = send_unlink(sctx, cur->full_path);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* link/move the ref to the new place. If we have an orphan
|
|
* inode, move it and update valid_path. If not, link or move
|
|
* it depending on the inode mode.
|
|
*/
|
|
if (is_orphan) {
|
|
ret = send_rename(sctx, valid_path, cur->full_path);
|
|
if (ret < 0)
|
|
goto out;
|
|
is_orphan = 0;
|
|
ret = fs_path_copy(valid_path, cur->full_path);
|
|
if (ret < 0)
|
|
goto out;
|
|
} else {
|
|
if (S_ISDIR(sctx->cur_inode_mode)) {
|
|
/*
|
|
* Dirs can't be linked, so move it. For moved
|
|
* dirs, we always have one new and one deleted
|
|
* ref. The deleted ref is ignored later.
|
|
*/
|
|
ret = send_rename(sctx, valid_path,
|
|
cur->full_path);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = fs_path_copy(valid_path, cur->full_path);
|
|
if (ret < 0)
|
|
goto out;
|
|
} else {
|
|
ret = send_link(sctx, cur->full_path,
|
|
valid_path);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
}
|
|
ret = ulist_add(check_dirs, cur->dir, cur->dir_gen,
|
|
GFP_NOFS);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
if (S_ISDIR(sctx->cur_inode_mode) && sctx->cur_inode_deleted) {
|
|
/*
|
|
* Check if we can already rmdir the directory. If not,
|
|
* orphanize it. For every dir item inside that gets deleted
|
|
* later, we do this check again and rmdir it then if possible.
|
|
* See the use of check_dirs for more details.
|
|
*/
|
|
ret = can_rmdir(sctx, sctx->cur_ino, sctx->cur_ino);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret) {
|
|
ret = send_rmdir(sctx, valid_path);
|
|
if (ret < 0)
|
|
goto out;
|
|
} else if (!is_orphan) {
|
|
ret = orphanize_inode(sctx, sctx->cur_ino,
|
|
sctx->cur_inode_gen, valid_path);
|
|
if (ret < 0)
|
|
goto out;
|
|
is_orphan = 1;
|
|
}
|
|
|
|
list_for_each_entry(cur, &sctx->deleted_refs, list) {
|
|
ret = ulist_add(check_dirs, cur->dir, cur->dir_gen,
|
|
GFP_NOFS);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
} else if (S_ISDIR(sctx->cur_inode_mode) &&
|
|
!list_empty(&sctx->deleted_refs)) {
|
|
/*
|
|
* We have a moved dir. Add the old parent to check_dirs
|
|
*/
|
|
cur = list_entry(sctx->deleted_refs.next, struct recorded_ref,
|
|
list);
|
|
ret = ulist_add(check_dirs, cur->dir, cur->dir_gen,
|
|
GFP_NOFS);
|
|
if (ret < 0)
|
|
goto out;
|
|
} else if (!S_ISDIR(sctx->cur_inode_mode)) {
|
|
/*
|
|
* We have a non dir inode. Go through all deleted refs and
|
|
* unlink them if they were not already overwritten by other
|
|
* inodes.
|
|
*/
|
|
list_for_each_entry(cur, &sctx->deleted_refs, list) {
|
|
ret = did_overwrite_ref(sctx, cur->dir, cur->dir_gen,
|
|
sctx->cur_ino, sctx->cur_inode_gen,
|
|
cur->name, cur->name_len);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (!ret) {
|
|
ret = send_unlink(sctx, cur->full_path);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
ret = ulist_add(check_dirs, cur->dir, cur->dir_gen,
|
|
GFP_NOFS);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* If the inode is still orphan, unlink the orphan. This may
|
|
* happen when a previous inode did overwrite the first ref
|
|
* of this inode and no new refs were added for the current
|
|
* inode. Unlinking does not mean that the inode is deleted in
|
|
* all cases. There may still be links to this inode in other
|
|
* places.
|
|
*/
|
|
if (is_orphan) {
|
|
ret = send_unlink(sctx, valid_path);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We did collect all parent dirs where cur_inode was once located. We
|
|
* now go through all these dirs and check if they are pending for
|
|
* deletion and if it's finally possible to perform the rmdir now.
|
|
* We also update the inode stats of the parent dirs here.
|
|
*/
|
|
ULIST_ITER_INIT(&uit);
|
|
while ((un = ulist_next(check_dirs, &uit))) {
|
|
/*
|
|
* In case we had refs into dirs that were not processed yet,
|
|
* we don't need to do the utime and rmdir logic for these dirs.
|
|
* The dir will be processed later.
|
|
*/
|
|
if (un->val > sctx->cur_ino)
|
|
continue;
|
|
|
|
ret = get_cur_inode_state(sctx, un->val, un->aux);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (ret == inode_state_did_create ||
|
|
ret == inode_state_no_change) {
|
|
/* TODO delayed utimes */
|
|
ret = send_utimes(sctx, un->val, un->aux);
|
|
if (ret < 0)
|
|
goto out;
|
|
} else if (ret == inode_state_did_delete) {
|
|
ret = can_rmdir(sctx, un->val, sctx->cur_ino);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret) {
|
|
ret = get_cur_path(sctx, un->val, un->aux,
|
|
valid_path);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = send_rmdir(sctx, valid_path);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
out:
|
|
free_recorded_refs(sctx);
|
|
ulist_free(check_dirs);
|
|
fs_path_free(sctx, valid_path);
|
|
return ret;
|
|
}
|
|
|
|
static int __record_new_ref(int num, u64 dir, int index,
|
|
struct fs_path *name,
|
|
void *ctx)
|
|
{
|
|
int ret = 0;
|
|
struct send_ctx *sctx = ctx;
|
|
struct fs_path *p;
|
|
u64 gen;
|
|
|
|
p = fs_path_alloc(sctx);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
ret = get_inode_info(sctx->send_root, dir, NULL, &gen, NULL, NULL,
|
|
NULL, NULL);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = get_cur_path(sctx, dir, gen, p);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = fs_path_add_path(p, name);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = record_ref(&sctx->new_refs, dir, gen, p);
|
|
|
|
out:
|
|
if (ret)
|
|
fs_path_free(sctx, p);
|
|
return ret;
|
|
}
|
|
|
|
static int __record_deleted_ref(int num, u64 dir, int index,
|
|
struct fs_path *name,
|
|
void *ctx)
|
|
{
|
|
int ret = 0;
|
|
struct send_ctx *sctx = ctx;
|
|
struct fs_path *p;
|
|
u64 gen;
|
|
|
|
p = fs_path_alloc(sctx);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
ret = get_inode_info(sctx->parent_root, dir, NULL, &gen, NULL, NULL,
|
|
NULL, NULL);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = get_cur_path(sctx, dir, gen, p);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = fs_path_add_path(p, name);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = record_ref(&sctx->deleted_refs, dir, gen, p);
|
|
|
|
out:
|
|
if (ret)
|
|
fs_path_free(sctx, p);
|
|
return ret;
|
|
}
|
|
|
|
static int record_new_ref(struct send_ctx *sctx)
|
|
{
|
|
int ret;
|
|
|
|
ret = iterate_inode_ref(sctx, sctx->send_root, sctx->left_path,
|
|
sctx->cmp_key, 0, __record_new_ref, sctx);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = 0;
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int record_deleted_ref(struct send_ctx *sctx)
|
|
{
|
|
int ret;
|
|
|
|
ret = iterate_inode_ref(sctx, sctx->parent_root, sctx->right_path,
|
|
sctx->cmp_key, 0, __record_deleted_ref, sctx);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = 0;
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
struct find_ref_ctx {
|
|
u64 dir;
|
|
struct fs_path *name;
|
|
int found_idx;
|
|
};
|
|
|
|
static int __find_iref(int num, u64 dir, int index,
|
|
struct fs_path *name,
|
|
void *ctx_)
|
|
{
|
|
struct find_ref_ctx *ctx = ctx_;
|
|
|
|
if (dir == ctx->dir && fs_path_len(name) == fs_path_len(ctx->name) &&
|
|
strncmp(name->start, ctx->name->start, fs_path_len(name)) == 0) {
|
|
ctx->found_idx = num;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int find_iref(struct send_ctx *sctx,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct btrfs_key *key,
|
|
u64 dir, struct fs_path *name)
|
|
{
|
|
int ret;
|
|
struct find_ref_ctx ctx;
|
|
|
|
ctx.dir = dir;
|
|
ctx.name = name;
|
|
ctx.found_idx = -1;
|
|
|
|
ret = iterate_inode_ref(sctx, root, path, key, 0, __find_iref, &ctx);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (ctx.found_idx == -1)
|
|
return -ENOENT;
|
|
|
|
return ctx.found_idx;
|
|
}
|
|
|
|
static int __record_changed_new_ref(int num, u64 dir, int index,
|
|
struct fs_path *name,
|
|
void *ctx)
|
|
{
|
|
int ret;
|
|
struct send_ctx *sctx = ctx;
|
|
|
|
ret = find_iref(sctx, sctx->parent_root, sctx->right_path,
|
|
sctx->cmp_key, dir, name);
|
|
if (ret == -ENOENT)
|
|
ret = __record_new_ref(num, dir, index, name, sctx);
|
|
else if (ret > 0)
|
|
ret = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __record_changed_deleted_ref(int num, u64 dir, int index,
|
|
struct fs_path *name,
|
|
void *ctx)
|
|
{
|
|
int ret;
|
|
struct send_ctx *sctx = ctx;
|
|
|
|
ret = find_iref(sctx, sctx->send_root, sctx->left_path, sctx->cmp_key,
|
|
dir, name);
|
|
if (ret == -ENOENT)
|
|
ret = __record_deleted_ref(num, dir, index, name, sctx);
|
|
else if (ret > 0)
|
|
ret = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int record_changed_ref(struct send_ctx *sctx)
|
|
{
|
|
int ret = 0;
|
|
|
|
ret = iterate_inode_ref(sctx, sctx->send_root, sctx->left_path,
|
|
sctx->cmp_key, 0, __record_changed_new_ref, sctx);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = iterate_inode_ref(sctx, sctx->parent_root, sctx->right_path,
|
|
sctx->cmp_key, 0, __record_changed_deleted_ref, sctx);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = 0;
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Record and process all refs at once. Needed when an inode changes the
|
|
* generation number, which means that it was deleted and recreated.
|
|
*/
|
|
static int process_all_refs(struct send_ctx *sctx,
|
|
enum btrfs_compare_tree_result cmd)
|
|
{
|
|
int ret;
|
|
struct btrfs_root *root;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
struct btrfs_key found_key;
|
|
struct extent_buffer *eb;
|
|
int slot;
|
|
iterate_inode_ref_t cb;
|
|
|
|
path = alloc_path_for_send();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
if (cmd == BTRFS_COMPARE_TREE_NEW) {
|
|
root = sctx->send_root;
|
|
cb = __record_new_ref;
|
|
} else if (cmd == BTRFS_COMPARE_TREE_DELETED) {
|
|
root = sctx->parent_root;
|
|
cb = __record_deleted_ref;
|
|
} else {
|
|
BUG();
|
|
}
|
|
|
|
key.objectid = sctx->cmp_key->objectid;
|
|
key.type = BTRFS_INODE_REF_KEY;
|
|
key.offset = 0;
|
|
while (1) {
|
|
ret = btrfs_search_slot_for_read(root, &key, path, 1, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret)
|
|
break;
|
|
|
|
eb = path->nodes[0];
|
|
slot = path->slots[0];
|
|
btrfs_item_key_to_cpu(eb, &found_key, slot);
|
|
|
|
if (found_key.objectid != key.objectid ||
|
|
found_key.type != key.type)
|
|
break;
|
|
|
|
ret = iterate_inode_ref(sctx, root, path, &found_key, 0, cb,
|
|
sctx);
|
|
btrfs_release_path(path);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
key.offset = found_key.offset + 1;
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
ret = process_recorded_refs(sctx);
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int send_set_xattr(struct send_ctx *sctx,
|
|
struct fs_path *path,
|
|
const char *name, int name_len,
|
|
const char *data, int data_len)
|
|
{
|
|
int ret = 0;
|
|
|
|
ret = begin_cmd(sctx, BTRFS_SEND_C_SET_XATTR);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, path);
|
|
TLV_PUT_STRING(sctx, BTRFS_SEND_A_XATTR_NAME, name, name_len);
|
|
TLV_PUT(sctx, BTRFS_SEND_A_XATTR_DATA, data, data_len);
|
|
|
|
ret = send_cmd(sctx);
|
|
|
|
tlv_put_failure:
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int send_remove_xattr(struct send_ctx *sctx,
|
|
struct fs_path *path,
|
|
const char *name, int name_len)
|
|
{
|
|
int ret = 0;
|
|
|
|
ret = begin_cmd(sctx, BTRFS_SEND_C_REMOVE_XATTR);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, path);
|
|
TLV_PUT_STRING(sctx, BTRFS_SEND_A_XATTR_NAME, name, name_len);
|
|
|
|
ret = send_cmd(sctx);
|
|
|
|
tlv_put_failure:
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int __process_new_xattr(int num, struct btrfs_key *di_key,
|
|
const char *name, int name_len,
|
|
const char *data, int data_len,
|
|
u8 type, void *ctx)
|
|
{
|
|
int ret;
|
|
struct send_ctx *sctx = ctx;
|
|
struct fs_path *p;
|
|
posix_acl_xattr_header dummy_acl;
|
|
|
|
p = fs_path_alloc(sctx);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* This hack is needed because empty acl's are stored as zero byte
|
|
* data in xattrs. Problem with that is, that receiving these zero byte
|
|
* acl's will fail later. To fix this, we send a dummy acl list that
|
|
* only contains the version number and no entries.
|
|
*/
|
|
if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS, name_len) ||
|
|
!strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT, name_len)) {
|
|
if (data_len == 0) {
|
|
dummy_acl.a_version =
|
|
cpu_to_le32(POSIX_ACL_XATTR_VERSION);
|
|
data = (char *)&dummy_acl;
|
|
data_len = sizeof(dummy_acl);
|
|
}
|
|
}
|
|
|
|
ret = get_cur_path(sctx, sctx->cur_ino, sctx->cur_inode_gen, p);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = send_set_xattr(sctx, p, name, name_len, data, data_len);
|
|
|
|
out:
|
|
fs_path_free(sctx, p);
|
|
return ret;
|
|
}
|
|
|
|
static int __process_deleted_xattr(int num, struct btrfs_key *di_key,
|
|
const char *name, int name_len,
|
|
const char *data, int data_len,
|
|
u8 type, void *ctx)
|
|
{
|
|
int ret;
|
|
struct send_ctx *sctx = ctx;
|
|
struct fs_path *p;
|
|
|
|
p = fs_path_alloc(sctx);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
ret = get_cur_path(sctx, sctx->cur_ino, sctx->cur_inode_gen, p);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = send_remove_xattr(sctx, p, name, name_len);
|
|
|
|
out:
|
|
fs_path_free(sctx, p);
|
|
return ret;
|
|
}
|
|
|
|
static int process_new_xattr(struct send_ctx *sctx)
|
|
{
|
|
int ret = 0;
|
|
|
|
ret = iterate_dir_item(sctx, sctx->send_root, sctx->left_path,
|
|
sctx->cmp_key, __process_new_xattr, sctx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int process_deleted_xattr(struct send_ctx *sctx)
|
|
{
|
|
int ret;
|
|
|
|
ret = iterate_dir_item(sctx, sctx->parent_root, sctx->right_path,
|
|
sctx->cmp_key, __process_deleted_xattr, sctx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct find_xattr_ctx {
|
|
const char *name;
|
|
int name_len;
|
|
int found_idx;
|
|
char *found_data;
|
|
int found_data_len;
|
|
};
|
|
|
|
static int __find_xattr(int num, struct btrfs_key *di_key,
|
|
const char *name, int name_len,
|
|
const char *data, int data_len,
|
|
u8 type, void *vctx)
|
|
{
|
|
struct find_xattr_ctx *ctx = vctx;
|
|
|
|
if (name_len == ctx->name_len &&
|
|
strncmp(name, ctx->name, name_len) == 0) {
|
|
ctx->found_idx = num;
|
|
ctx->found_data_len = data_len;
|
|
ctx->found_data = kmalloc(data_len, GFP_NOFS);
|
|
if (!ctx->found_data)
|
|
return -ENOMEM;
|
|
memcpy(ctx->found_data, data, data_len);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int find_xattr(struct send_ctx *sctx,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct btrfs_key *key,
|
|
const char *name, int name_len,
|
|
char **data, int *data_len)
|
|
{
|
|
int ret;
|
|
struct find_xattr_ctx ctx;
|
|
|
|
ctx.name = name;
|
|
ctx.name_len = name_len;
|
|
ctx.found_idx = -1;
|
|
ctx.found_data = NULL;
|
|
ctx.found_data_len = 0;
|
|
|
|
ret = iterate_dir_item(sctx, root, path, key, __find_xattr, &ctx);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (ctx.found_idx == -1)
|
|
return -ENOENT;
|
|
if (data) {
|
|
*data = ctx.found_data;
|
|
*data_len = ctx.found_data_len;
|
|
} else {
|
|
kfree(ctx.found_data);
|
|
}
|
|
return ctx.found_idx;
|
|
}
|
|
|
|
|
|
static int __process_changed_new_xattr(int num, struct btrfs_key *di_key,
|
|
const char *name, int name_len,
|
|
const char *data, int data_len,
|
|
u8 type, void *ctx)
|
|
{
|
|
int ret;
|
|
struct send_ctx *sctx = ctx;
|
|
char *found_data = NULL;
|
|
int found_data_len = 0;
|
|
struct fs_path *p = NULL;
|
|
|
|
ret = find_xattr(sctx, sctx->parent_root, sctx->right_path,
|
|
sctx->cmp_key, name, name_len, &found_data,
|
|
&found_data_len);
|
|
if (ret == -ENOENT) {
|
|
ret = __process_new_xattr(num, di_key, name, name_len, data,
|
|
data_len, type, ctx);
|
|
} else if (ret >= 0) {
|
|
if (data_len != found_data_len ||
|
|
memcmp(data, found_data, data_len)) {
|
|
ret = __process_new_xattr(num, di_key, name, name_len,
|
|
data, data_len, type, ctx);
|
|
} else {
|
|
ret = 0;
|
|
}
|
|
}
|
|
|
|
kfree(found_data);
|
|
fs_path_free(sctx, p);
|
|
return ret;
|
|
}
|
|
|
|
static int __process_changed_deleted_xattr(int num, struct btrfs_key *di_key,
|
|
const char *name, int name_len,
|
|
const char *data, int data_len,
|
|
u8 type, void *ctx)
|
|
{
|
|
int ret;
|
|
struct send_ctx *sctx = ctx;
|
|
|
|
ret = find_xattr(sctx, sctx->send_root, sctx->left_path, sctx->cmp_key,
|
|
name, name_len, NULL, NULL);
|
|
if (ret == -ENOENT)
|
|
ret = __process_deleted_xattr(num, di_key, name, name_len, data,
|
|
data_len, type, ctx);
|
|
else if (ret >= 0)
|
|
ret = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int process_changed_xattr(struct send_ctx *sctx)
|
|
{
|
|
int ret = 0;
|
|
|
|
ret = iterate_dir_item(sctx, sctx->send_root, sctx->left_path,
|
|
sctx->cmp_key, __process_changed_new_xattr, sctx);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = iterate_dir_item(sctx, sctx->parent_root, sctx->right_path,
|
|
sctx->cmp_key, __process_changed_deleted_xattr, sctx);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int process_all_new_xattrs(struct send_ctx *sctx)
|
|
{
|
|
int ret;
|
|
struct btrfs_root *root;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
struct btrfs_key found_key;
|
|
struct extent_buffer *eb;
|
|
int slot;
|
|
|
|
path = alloc_path_for_send();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
root = sctx->send_root;
|
|
|
|
key.objectid = sctx->cmp_key->objectid;
|
|
key.type = BTRFS_XATTR_ITEM_KEY;
|
|
key.offset = 0;
|
|
while (1) {
|
|
ret = btrfs_search_slot_for_read(root, &key, path, 1, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
eb = path->nodes[0];
|
|
slot = path->slots[0];
|
|
btrfs_item_key_to_cpu(eb, &found_key, slot);
|
|
|
|
if (found_key.objectid != key.objectid ||
|
|
found_key.type != key.type) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
ret = iterate_dir_item(sctx, root, path, &found_key,
|
|
__process_new_xattr, sctx);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
btrfs_release_path(path);
|
|
key.offset = found_key.offset + 1;
|
|
}
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Read some bytes from the current inode/file and send a write command to
|
|
* user space.
|
|
*/
|
|
static int send_write(struct send_ctx *sctx, u64 offset, u32 len)
|
|
{
|
|
int ret = 0;
|
|
struct fs_path *p;
|
|
loff_t pos = offset;
|
|
int num_read = 0;
|
|
mm_segment_t old_fs;
|
|
|
|
p = fs_path_alloc(sctx);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* vfs normally only accepts user space buffers for security reasons.
|
|
* we only read from the file and also only provide the read_buf buffer
|
|
* to vfs. As this buffer does not come from a user space call, it's
|
|
* ok to temporary allow kernel space buffers.
|
|
*/
|
|
old_fs = get_fs();
|
|
set_fs(KERNEL_DS);
|
|
|
|
verbose_printk("btrfs: send_write offset=%llu, len=%d\n", offset, len);
|
|
|
|
ret = open_cur_inode_file(sctx);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = vfs_read(sctx->cur_inode_filp, sctx->read_buf, len, &pos);
|
|
if (ret < 0)
|
|
goto out;
|
|
num_read = ret;
|
|
if (!num_read)
|
|
goto out;
|
|
|
|
ret = begin_cmd(sctx, BTRFS_SEND_C_WRITE);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = get_cur_path(sctx, sctx->cur_ino, sctx->cur_inode_gen, p);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, p);
|
|
TLV_PUT_U64(sctx, BTRFS_SEND_A_FILE_OFFSET, offset);
|
|
TLV_PUT(sctx, BTRFS_SEND_A_DATA, sctx->read_buf, num_read);
|
|
|
|
ret = send_cmd(sctx);
|
|
|
|
tlv_put_failure:
|
|
out:
|
|
fs_path_free(sctx, p);
|
|
set_fs(old_fs);
|
|
if (ret < 0)
|
|
return ret;
|
|
return num_read;
|
|
}
|
|
|
|
/*
|
|
* Send a clone command to user space.
|
|
*/
|
|
static int send_clone(struct send_ctx *sctx,
|
|
u64 offset, u32 len,
|
|
struct clone_root *clone_root)
|
|
{
|
|
int ret = 0;
|
|
struct fs_path *p;
|
|
u64 gen;
|
|
|
|
verbose_printk("btrfs: send_clone offset=%llu, len=%d, clone_root=%llu, "
|
|
"clone_inode=%llu, clone_offset=%llu\n", offset, len,
|
|
clone_root->root->objectid, clone_root->ino,
|
|
clone_root->offset);
|
|
|
|
p = fs_path_alloc(sctx);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
ret = begin_cmd(sctx, BTRFS_SEND_C_CLONE);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = get_cur_path(sctx, sctx->cur_ino, sctx->cur_inode_gen, p);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
TLV_PUT_U64(sctx, BTRFS_SEND_A_FILE_OFFSET, offset);
|
|
TLV_PUT_U64(sctx, BTRFS_SEND_A_CLONE_LEN, len);
|
|
TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, p);
|
|
|
|
if (clone_root->root == sctx->send_root) {
|
|
ret = get_inode_info(sctx->send_root, clone_root->ino, NULL,
|
|
&gen, NULL, NULL, NULL, NULL);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = get_cur_path(sctx, clone_root->ino, gen, p);
|
|
} else {
|
|
ret = get_inode_path(sctx, clone_root->root,
|
|
clone_root->ino, p);
|
|
}
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
TLV_PUT_UUID(sctx, BTRFS_SEND_A_CLONE_UUID,
|
|
clone_root->root->root_item.uuid);
|
|
TLV_PUT_U64(sctx, BTRFS_SEND_A_CLONE_CTRANSID,
|
|
clone_root->root->root_item.ctransid);
|
|
TLV_PUT_PATH(sctx, BTRFS_SEND_A_CLONE_PATH, p);
|
|
TLV_PUT_U64(sctx, BTRFS_SEND_A_CLONE_OFFSET,
|
|
clone_root->offset);
|
|
|
|
ret = send_cmd(sctx);
|
|
|
|
tlv_put_failure:
|
|
out:
|
|
fs_path_free(sctx, p);
|
|
return ret;
|
|
}
|
|
|
|
static int send_write_or_clone(struct send_ctx *sctx,
|
|
struct btrfs_path *path,
|
|
struct btrfs_key *key,
|
|
struct clone_root *clone_root)
|
|
{
|
|
int ret = 0;
|
|
struct btrfs_file_extent_item *ei;
|
|
u64 offset = key->offset;
|
|
u64 pos = 0;
|
|
u64 len;
|
|
u32 l;
|
|
u8 type;
|
|
|
|
ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
|
|
struct btrfs_file_extent_item);
|
|
type = btrfs_file_extent_type(path->nodes[0], ei);
|
|
if (type == BTRFS_FILE_EXTENT_INLINE) {
|
|
len = btrfs_file_extent_inline_len(path->nodes[0], ei);
|
|
/*
|
|
* it is possible the inline item won't cover the whole page,
|
|
* but there may be items after this page. Make
|
|
* sure to send the whole thing
|
|
*/
|
|
len = PAGE_CACHE_ALIGN(len);
|
|
} else {
|
|
len = btrfs_file_extent_num_bytes(path->nodes[0], ei);
|
|
}
|
|
|
|
if (offset + len > sctx->cur_inode_size)
|
|
len = sctx->cur_inode_size - offset;
|
|
if (len == 0) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (!clone_root) {
|
|
while (pos < len) {
|
|
l = len - pos;
|
|
if (l > BTRFS_SEND_READ_SIZE)
|
|
l = BTRFS_SEND_READ_SIZE;
|
|
ret = send_write(sctx, pos + offset, l);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (!ret)
|
|
break;
|
|
pos += ret;
|
|
}
|
|
ret = 0;
|
|
} else {
|
|
ret = send_clone(sctx, offset, len, clone_root);
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int is_extent_unchanged(struct send_ctx *sctx,
|
|
struct btrfs_path *left_path,
|
|
struct btrfs_key *ekey)
|
|
{
|
|
int ret = 0;
|
|
struct btrfs_key key;
|
|
struct btrfs_path *path = NULL;
|
|
struct extent_buffer *eb;
|
|
int slot;
|
|
struct btrfs_key found_key;
|
|
struct btrfs_file_extent_item *ei;
|
|
u64 left_disknr;
|
|
u64 right_disknr;
|
|
u64 left_offset;
|
|
u64 right_offset;
|
|
u64 left_offset_fixed;
|
|
u64 left_len;
|
|
u64 right_len;
|
|
u64 left_gen;
|
|
u64 right_gen;
|
|
u8 left_type;
|
|
u8 right_type;
|
|
|
|
path = alloc_path_for_send();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
eb = left_path->nodes[0];
|
|
slot = left_path->slots[0];
|
|
ei = btrfs_item_ptr(eb, slot, struct btrfs_file_extent_item);
|
|
left_type = btrfs_file_extent_type(eb, ei);
|
|
|
|
if (left_type != BTRFS_FILE_EXTENT_REG) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
left_disknr = btrfs_file_extent_disk_bytenr(eb, ei);
|
|
left_len = btrfs_file_extent_num_bytes(eb, ei);
|
|
left_offset = btrfs_file_extent_offset(eb, ei);
|
|
left_gen = btrfs_file_extent_generation(eb, ei);
|
|
|
|
/*
|
|
* Following comments will refer to these graphics. L is the left
|
|
* extents which we are checking at the moment. 1-8 are the right
|
|
* extents that we iterate.
|
|
*
|
|
* |-----L-----|
|
|
* |-1-|-2a-|-3-|-4-|-5-|-6-|
|
|
*
|
|
* |-----L-----|
|
|
* |--1--|-2b-|...(same as above)
|
|
*
|
|
* Alternative situation. Happens on files where extents got split.
|
|
* |-----L-----|
|
|
* |-----------7-----------|-6-|
|
|
*
|
|
* Alternative situation. Happens on files which got larger.
|
|
* |-----L-----|
|
|
* |-8-|
|
|
* Nothing follows after 8.
|
|
*/
|
|
|
|
key.objectid = ekey->objectid;
|
|
key.type = BTRFS_EXTENT_DATA_KEY;
|
|
key.offset = ekey->offset;
|
|
ret = btrfs_search_slot_for_read(sctx->parent_root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Handle special case where the right side has no extents at all.
|
|
*/
|
|
eb = path->nodes[0];
|
|
slot = path->slots[0];
|
|
btrfs_item_key_to_cpu(eb, &found_key, slot);
|
|
if (found_key.objectid != key.objectid ||
|
|
found_key.type != key.type) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* We're now on 2a, 2b or 7.
|
|
*/
|
|
key = found_key;
|
|
while (key.offset < ekey->offset + left_len) {
|
|
ei = btrfs_item_ptr(eb, slot, struct btrfs_file_extent_item);
|
|
right_type = btrfs_file_extent_type(eb, ei);
|
|
right_disknr = btrfs_file_extent_disk_bytenr(eb, ei);
|
|
right_len = btrfs_file_extent_num_bytes(eb, ei);
|
|
right_offset = btrfs_file_extent_offset(eb, ei);
|
|
right_gen = btrfs_file_extent_generation(eb, ei);
|
|
|
|
if (right_type != BTRFS_FILE_EXTENT_REG) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Are we at extent 8? If yes, we know the extent is changed.
|
|
* This may only happen on the first iteration.
|
|
*/
|
|
if (found_key.offset + right_len <= ekey->offset) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
left_offset_fixed = left_offset;
|
|
if (key.offset < ekey->offset) {
|
|
/* Fix the right offset for 2a and 7. */
|
|
right_offset += ekey->offset - key.offset;
|
|
} else {
|
|
/* Fix the left offset for all behind 2a and 2b */
|
|
left_offset_fixed += key.offset - ekey->offset;
|
|
}
|
|
|
|
/*
|
|
* Check if we have the same extent.
|
|
*/
|
|
if (left_disknr != right_disknr ||
|
|
left_offset_fixed != right_offset ||
|
|
left_gen != right_gen) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Go to the next extent.
|
|
*/
|
|
ret = btrfs_next_item(sctx->parent_root, path);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (!ret) {
|
|
eb = path->nodes[0];
|
|
slot = path->slots[0];
|
|
btrfs_item_key_to_cpu(eb, &found_key, slot);
|
|
}
|
|
if (ret || found_key.objectid != key.objectid ||
|
|
found_key.type != key.type) {
|
|
key.offset += right_len;
|
|
break;
|
|
} else {
|
|
if (found_key.offset != key.offset + right_len) {
|
|
/* Should really not happen */
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
}
|
|
key = found_key;
|
|
}
|
|
|
|
/*
|
|
* We're now behind the left extent (treat as unchanged) or at the end
|
|
* of the right side (treat as changed).
|
|
*/
|
|
if (key.offset >= ekey->offset + left_len)
|
|
ret = 1;
|
|
else
|
|
ret = 0;
|
|
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int process_extent(struct send_ctx *sctx,
|
|
struct btrfs_path *path,
|
|
struct btrfs_key *key)
|
|
{
|
|
int ret = 0;
|
|
struct clone_root *found_clone = NULL;
|
|
|
|
if (S_ISLNK(sctx->cur_inode_mode))
|
|
return 0;
|
|
|
|
if (sctx->parent_root && !sctx->cur_inode_new) {
|
|
ret = is_extent_unchanged(sctx, path, key);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ret = find_extent_clone(sctx, path, key->objectid, key->offset,
|
|
sctx->cur_inode_size, &found_clone);
|
|
if (ret != -ENOENT && ret < 0)
|
|
goto out;
|
|
|
|
ret = send_write_or_clone(sctx, path, key, found_clone);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int process_all_extents(struct send_ctx *sctx)
|
|
{
|
|
int ret;
|
|
struct btrfs_root *root;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
struct btrfs_key found_key;
|
|
struct extent_buffer *eb;
|
|
int slot;
|
|
|
|
root = sctx->send_root;
|
|
path = alloc_path_for_send();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
key.objectid = sctx->cmp_key->objectid;
|
|
key.type = BTRFS_EXTENT_DATA_KEY;
|
|
key.offset = 0;
|
|
while (1) {
|
|
ret = btrfs_search_slot_for_read(root, &key, path, 1, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
eb = path->nodes[0];
|
|
slot = path->slots[0];
|
|
btrfs_item_key_to_cpu(eb, &found_key, slot);
|
|
|
|
if (found_key.objectid != key.objectid ||
|
|
found_key.type != key.type) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
ret = process_extent(sctx, path, &found_key);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
btrfs_release_path(path);
|
|
key.offset = found_key.offset + 1;
|
|
}
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int process_recorded_refs_if_needed(struct send_ctx *sctx, int at_end)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (sctx->cur_ino == 0)
|
|
goto out;
|
|
if (!at_end && sctx->cur_ino == sctx->cmp_key->objectid &&
|
|
sctx->cmp_key->type <= BTRFS_INODE_REF_KEY)
|
|
goto out;
|
|
if (list_empty(&sctx->new_refs) && list_empty(&sctx->deleted_refs))
|
|
goto out;
|
|
|
|
ret = process_recorded_refs(sctx);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/*
|
|
* We have processed the refs and thus need to advance send_progress.
|
|
* Now, calls to get_cur_xxx will take the updated refs of the current
|
|
* inode into account.
|
|
*/
|
|
sctx->send_progress = sctx->cur_ino + 1;
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int finish_inode_if_needed(struct send_ctx *sctx, int at_end)
|
|
{
|
|
int ret = 0;
|
|
u64 left_mode;
|
|
u64 left_uid;
|
|
u64 left_gid;
|
|
u64 right_mode;
|
|
u64 right_uid;
|
|
u64 right_gid;
|
|
int need_chmod = 0;
|
|
int need_chown = 0;
|
|
|
|
ret = process_recorded_refs_if_needed(sctx, at_end);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (sctx->cur_ino == 0 || sctx->cur_inode_deleted)
|
|
goto out;
|
|
if (!at_end && sctx->cmp_key->objectid == sctx->cur_ino)
|
|
goto out;
|
|
|
|
ret = get_inode_info(sctx->send_root, sctx->cur_ino, NULL, NULL,
|
|
&left_mode, &left_uid, &left_gid, NULL);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (!S_ISLNK(sctx->cur_inode_mode)) {
|
|
if (!sctx->parent_root || sctx->cur_inode_new) {
|
|
need_chmod = 1;
|
|
need_chown = 1;
|
|
} else {
|
|
ret = get_inode_info(sctx->parent_root, sctx->cur_ino,
|
|
NULL, NULL, &right_mode, &right_uid,
|
|
&right_gid, NULL);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (left_uid != right_uid || left_gid != right_gid)
|
|
need_chown = 1;
|
|
if (left_mode != right_mode)
|
|
need_chmod = 1;
|
|
}
|
|
}
|
|
|
|
if (S_ISREG(sctx->cur_inode_mode)) {
|
|
ret = send_truncate(sctx, sctx->cur_ino, sctx->cur_inode_gen,
|
|
sctx->cur_inode_size);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
if (need_chown) {
|
|
ret = send_chown(sctx, sctx->cur_ino, sctx->cur_inode_gen,
|
|
left_uid, left_gid);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
if (need_chmod) {
|
|
ret = send_chmod(sctx, sctx->cur_ino, sctx->cur_inode_gen,
|
|
left_mode);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Need to send that every time, no matter if it actually changed
|
|
* between the two trees as we have done changes to the inode before.
|
|
*/
|
|
ret = send_utimes(sctx, sctx->cur_ino, sctx->cur_inode_gen);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int changed_inode(struct send_ctx *sctx,
|
|
enum btrfs_compare_tree_result result)
|
|
{
|
|
int ret = 0;
|
|
struct btrfs_key *key = sctx->cmp_key;
|
|
struct btrfs_inode_item *left_ii = NULL;
|
|
struct btrfs_inode_item *right_ii = NULL;
|
|
u64 left_gen = 0;
|
|
u64 right_gen = 0;
|
|
|
|
ret = close_cur_inode_file(sctx);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
sctx->cur_ino = key->objectid;
|
|
sctx->cur_inode_new_gen = 0;
|
|
|
|
/*
|
|
* Set send_progress to current inode. This will tell all get_cur_xxx
|
|
* functions that the current inode's refs are not updated yet. Later,
|
|
* when process_recorded_refs is finished, it is set to cur_ino + 1.
|
|
*/
|
|
sctx->send_progress = sctx->cur_ino;
|
|
|
|
if (result == BTRFS_COMPARE_TREE_NEW ||
|
|
result == BTRFS_COMPARE_TREE_CHANGED) {
|
|
left_ii = btrfs_item_ptr(sctx->left_path->nodes[0],
|
|
sctx->left_path->slots[0],
|
|
struct btrfs_inode_item);
|
|
left_gen = btrfs_inode_generation(sctx->left_path->nodes[0],
|
|
left_ii);
|
|
} else {
|
|
right_ii = btrfs_item_ptr(sctx->right_path->nodes[0],
|
|
sctx->right_path->slots[0],
|
|
struct btrfs_inode_item);
|
|
right_gen = btrfs_inode_generation(sctx->right_path->nodes[0],
|
|
right_ii);
|
|
}
|
|
if (result == BTRFS_COMPARE_TREE_CHANGED) {
|
|
right_ii = btrfs_item_ptr(sctx->right_path->nodes[0],
|
|
sctx->right_path->slots[0],
|
|
struct btrfs_inode_item);
|
|
|
|
right_gen = btrfs_inode_generation(sctx->right_path->nodes[0],
|
|
right_ii);
|
|
|
|
/*
|
|
* The cur_ino = root dir case is special here. We can't treat
|
|
* the inode as deleted+reused because it would generate a
|
|
* stream that tries to delete/mkdir the root dir.
|
|
*/
|
|
if (left_gen != right_gen &&
|
|
sctx->cur_ino != BTRFS_FIRST_FREE_OBJECTID)
|
|
sctx->cur_inode_new_gen = 1;
|
|
}
|
|
|
|
if (result == BTRFS_COMPARE_TREE_NEW) {
|
|
sctx->cur_inode_gen = left_gen;
|
|
sctx->cur_inode_new = 1;
|
|
sctx->cur_inode_deleted = 0;
|
|
sctx->cur_inode_size = btrfs_inode_size(
|
|
sctx->left_path->nodes[0], left_ii);
|
|
sctx->cur_inode_mode = btrfs_inode_mode(
|
|
sctx->left_path->nodes[0], left_ii);
|
|
if (sctx->cur_ino != BTRFS_FIRST_FREE_OBJECTID)
|
|
ret = send_create_inode_if_needed(sctx);
|
|
} else if (result == BTRFS_COMPARE_TREE_DELETED) {
|
|
sctx->cur_inode_gen = right_gen;
|
|
sctx->cur_inode_new = 0;
|
|
sctx->cur_inode_deleted = 1;
|
|
sctx->cur_inode_size = btrfs_inode_size(
|
|
sctx->right_path->nodes[0], right_ii);
|
|
sctx->cur_inode_mode = btrfs_inode_mode(
|
|
sctx->right_path->nodes[0], right_ii);
|
|
} else if (result == BTRFS_COMPARE_TREE_CHANGED) {
|
|
/*
|
|
* We need to do some special handling in case the inode was
|
|
* reported as changed with a changed generation number. This
|
|
* means that the original inode was deleted and new inode
|
|
* reused the same inum. So we have to treat the old inode as
|
|
* deleted and the new one as new.
|
|
*/
|
|
if (sctx->cur_inode_new_gen) {
|
|
/*
|
|
* First, process the inode as if it was deleted.
|
|
*/
|
|
sctx->cur_inode_gen = right_gen;
|
|
sctx->cur_inode_new = 0;
|
|
sctx->cur_inode_deleted = 1;
|
|
sctx->cur_inode_size = btrfs_inode_size(
|
|
sctx->right_path->nodes[0], right_ii);
|
|
sctx->cur_inode_mode = btrfs_inode_mode(
|
|
sctx->right_path->nodes[0], right_ii);
|
|
ret = process_all_refs(sctx,
|
|
BTRFS_COMPARE_TREE_DELETED);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/*
|
|
* Now process the inode as if it was new.
|
|
*/
|
|
sctx->cur_inode_gen = left_gen;
|
|
sctx->cur_inode_new = 1;
|
|
sctx->cur_inode_deleted = 0;
|
|
sctx->cur_inode_size = btrfs_inode_size(
|
|
sctx->left_path->nodes[0], left_ii);
|
|
sctx->cur_inode_mode = btrfs_inode_mode(
|
|
sctx->left_path->nodes[0], left_ii);
|
|
ret = send_create_inode_if_needed(sctx);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = process_all_refs(sctx, BTRFS_COMPARE_TREE_NEW);
|
|
if (ret < 0)
|
|
goto out;
|
|
/*
|
|
* Advance send_progress now as we did not get into
|
|
* process_recorded_refs_if_needed in the new_gen case.
|
|
*/
|
|
sctx->send_progress = sctx->cur_ino + 1;
|
|
|
|
/*
|
|
* Now process all extents and xattrs of the inode as if
|
|
* they were all new.
|
|
*/
|
|
ret = process_all_extents(sctx);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = process_all_new_xattrs(sctx);
|
|
if (ret < 0)
|
|
goto out;
|
|
} else {
|
|
sctx->cur_inode_gen = left_gen;
|
|
sctx->cur_inode_new = 0;
|
|
sctx->cur_inode_new_gen = 0;
|
|
sctx->cur_inode_deleted = 0;
|
|
sctx->cur_inode_size = btrfs_inode_size(
|
|
sctx->left_path->nodes[0], left_ii);
|
|
sctx->cur_inode_mode = btrfs_inode_mode(
|
|
sctx->left_path->nodes[0], left_ii);
|
|
}
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* We have to process new refs before deleted refs, but compare_trees gives us
|
|
* the new and deleted refs mixed. To fix this, we record the new/deleted refs
|
|
* first and later process them in process_recorded_refs.
|
|
* For the cur_inode_new_gen case, we skip recording completely because
|
|
* changed_inode did already initiate processing of refs. The reason for this is
|
|
* that in this case, compare_tree actually compares the refs of 2 different
|
|
* inodes. To fix this, process_all_refs is used in changed_inode to handle all
|
|
* refs of the right tree as deleted and all refs of the left tree as new.
|
|
*/
|
|
static int changed_ref(struct send_ctx *sctx,
|
|
enum btrfs_compare_tree_result result)
|
|
{
|
|
int ret = 0;
|
|
|
|
BUG_ON(sctx->cur_ino != sctx->cmp_key->objectid);
|
|
|
|
if (!sctx->cur_inode_new_gen &&
|
|
sctx->cur_ino != BTRFS_FIRST_FREE_OBJECTID) {
|
|
if (result == BTRFS_COMPARE_TREE_NEW)
|
|
ret = record_new_ref(sctx);
|
|
else if (result == BTRFS_COMPARE_TREE_DELETED)
|
|
ret = record_deleted_ref(sctx);
|
|
else if (result == BTRFS_COMPARE_TREE_CHANGED)
|
|
ret = record_changed_ref(sctx);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Process new/deleted/changed xattrs. We skip processing in the
|
|
* cur_inode_new_gen case because changed_inode did already initiate processing
|
|
* of xattrs. The reason is the same as in changed_ref
|
|
*/
|
|
static int changed_xattr(struct send_ctx *sctx,
|
|
enum btrfs_compare_tree_result result)
|
|
{
|
|
int ret = 0;
|
|
|
|
BUG_ON(sctx->cur_ino != sctx->cmp_key->objectid);
|
|
|
|
if (!sctx->cur_inode_new_gen && !sctx->cur_inode_deleted) {
|
|
if (result == BTRFS_COMPARE_TREE_NEW)
|
|
ret = process_new_xattr(sctx);
|
|
else if (result == BTRFS_COMPARE_TREE_DELETED)
|
|
ret = process_deleted_xattr(sctx);
|
|
else if (result == BTRFS_COMPARE_TREE_CHANGED)
|
|
ret = process_changed_xattr(sctx);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Process new/deleted/changed extents. We skip processing in the
|
|
* cur_inode_new_gen case because changed_inode did already initiate processing
|
|
* of extents. The reason is the same as in changed_ref
|
|
*/
|
|
static int changed_extent(struct send_ctx *sctx,
|
|
enum btrfs_compare_tree_result result)
|
|
{
|
|
int ret = 0;
|
|
|
|
BUG_ON(sctx->cur_ino != sctx->cmp_key->objectid);
|
|
|
|
if (!sctx->cur_inode_new_gen && !sctx->cur_inode_deleted) {
|
|
if (result != BTRFS_COMPARE_TREE_DELETED)
|
|
ret = process_extent(sctx, sctx->left_path,
|
|
sctx->cmp_key);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Updates compare related fields in sctx and simply forwards to the actual
|
|
* changed_xxx functions.
|
|
*/
|
|
static int changed_cb(struct btrfs_root *left_root,
|
|
struct btrfs_root *right_root,
|
|
struct btrfs_path *left_path,
|
|
struct btrfs_path *right_path,
|
|
struct btrfs_key *key,
|
|
enum btrfs_compare_tree_result result,
|
|
void *ctx)
|
|
{
|
|
int ret = 0;
|
|
struct send_ctx *sctx = ctx;
|
|
|
|
sctx->left_path = left_path;
|
|
sctx->right_path = right_path;
|
|
sctx->cmp_key = key;
|
|
|
|
ret = finish_inode_if_needed(sctx, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/* Ignore non-FS objects */
|
|
if (key->objectid == BTRFS_FREE_INO_OBJECTID ||
|
|
key->objectid == BTRFS_FREE_SPACE_OBJECTID)
|
|
goto out;
|
|
|
|
if (key->type == BTRFS_INODE_ITEM_KEY)
|
|
ret = changed_inode(sctx, result);
|
|
else if (key->type == BTRFS_INODE_REF_KEY)
|
|
ret = changed_ref(sctx, result);
|
|
else if (key->type == BTRFS_XATTR_ITEM_KEY)
|
|
ret = changed_xattr(sctx, result);
|
|
else if (key->type == BTRFS_EXTENT_DATA_KEY)
|
|
ret = changed_extent(sctx, result);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int full_send_tree(struct send_ctx *sctx)
|
|
{
|
|
int ret;
|
|
struct btrfs_trans_handle *trans = NULL;
|
|
struct btrfs_root *send_root = sctx->send_root;
|
|
struct btrfs_key key;
|
|
struct btrfs_key found_key;
|
|
struct btrfs_path *path;
|
|
struct extent_buffer *eb;
|
|
int slot;
|
|
u64 start_ctransid;
|
|
u64 ctransid;
|
|
|
|
path = alloc_path_for_send();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
spin_lock(&send_root->root_times_lock);
|
|
start_ctransid = btrfs_root_ctransid(&send_root->root_item);
|
|
spin_unlock(&send_root->root_times_lock);
|
|
|
|
key.objectid = BTRFS_FIRST_FREE_OBJECTID;
|
|
key.type = BTRFS_INODE_ITEM_KEY;
|
|
key.offset = 0;
|
|
|
|
join_trans:
|
|
/*
|
|
* We need to make sure the transaction does not get committed
|
|
* while we do anything on commit roots. Join a transaction to prevent
|
|
* this.
|
|
*/
|
|
trans = btrfs_join_transaction(send_root);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
trans = NULL;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Make sure the tree has not changed after re-joining. We detect this
|
|
* by comparing start_ctransid and ctransid. They should always match.
|
|
*/
|
|
spin_lock(&send_root->root_times_lock);
|
|
ctransid = btrfs_root_ctransid(&send_root->root_item);
|
|
spin_unlock(&send_root->root_times_lock);
|
|
|
|
if (ctransid != start_ctransid) {
|
|
WARN(1, KERN_WARNING "btrfs: the root that you're trying to "
|
|
"send was modified in between. This is "
|
|
"probably a bug.\n");
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
ret = btrfs_search_slot_for_read(send_root, &key, path, 1, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret)
|
|
goto out_finish;
|
|
|
|
while (1) {
|
|
/*
|
|
* When someone want to commit while we iterate, end the
|
|
* joined transaction and rejoin.
|
|
*/
|
|
if (btrfs_should_end_transaction(trans, send_root)) {
|
|
ret = btrfs_end_transaction(trans, send_root);
|
|
trans = NULL;
|
|
if (ret < 0)
|
|
goto out;
|
|
btrfs_release_path(path);
|
|
goto join_trans;
|
|
}
|
|
|
|
eb = path->nodes[0];
|
|
slot = path->slots[0];
|
|
btrfs_item_key_to_cpu(eb, &found_key, slot);
|
|
|
|
ret = changed_cb(send_root, NULL, path, NULL,
|
|
&found_key, BTRFS_COMPARE_TREE_NEW, sctx);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
key.objectid = found_key.objectid;
|
|
key.type = found_key.type;
|
|
key.offset = found_key.offset + 1;
|
|
|
|
ret = btrfs_next_item(send_root, path);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret) {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
out_finish:
|
|
ret = finish_inode_if_needed(sctx, 1);
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
if (trans) {
|
|
if (!ret)
|
|
ret = btrfs_end_transaction(trans, send_root);
|
|
else
|
|
btrfs_end_transaction(trans, send_root);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int send_subvol(struct send_ctx *sctx)
|
|
{
|
|
int ret;
|
|
|
|
ret = send_header(sctx);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = send_subvol_begin(sctx);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (sctx->parent_root) {
|
|
ret = btrfs_compare_trees(sctx->send_root, sctx->parent_root,
|
|
changed_cb, sctx);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = finish_inode_if_needed(sctx, 1);
|
|
if (ret < 0)
|
|
goto out;
|
|
} else {
|
|
ret = full_send_tree(sctx);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
if (!ret)
|
|
ret = close_cur_inode_file(sctx);
|
|
else
|
|
close_cur_inode_file(sctx);
|
|
|
|
free_recorded_refs(sctx);
|
|
return ret;
|
|
}
|
|
|
|
long btrfs_ioctl_send(struct file *mnt_file, void __user *arg_)
|
|
{
|
|
int ret = 0;
|
|
struct btrfs_root *send_root;
|
|
struct btrfs_root *clone_root;
|
|
struct btrfs_fs_info *fs_info;
|
|
struct btrfs_ioctl_send_args *arg = NULL;
|
|
struct btrfs_key key;
|
|
struct file *filp = NULL;
|
|
struct send_ctx *sctx = NULL;
|
|
u32 i;
|
|
u64 *clone_sources_tmp = NULL;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
send_root = BTRFS_I(fdentry(mnt_file)->d_inode)->root;
|
|
fs_info = send_root->fs_info;
|
|
|
|
arg = memdup_user(arg_, sizeof(*arg));
|
|
if (IS_ERR(arg)) {
|
|
ret = PTR_ERR(arg);
|
|
arg = NULL;
|
|
goto out;
|
|
}
|
|
|
|
if (!access_ok(VERIFY_READ, arg->clone_sources,
|
|
sizeof(*arg->clone_sources *
|
|
arg->clone_sources_count))) {
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
sctx = kzalloc(sizeof(struct send_ctx), GFP_NOFS);
|
|
if (!sctx) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&sctx->new_refs);
|
|
INIT_LIST_HEAD(&sctx->deleted_refs);
|
|
INIT_RADIX_TREE(&sctx->name_cache, GFP_NOFS);
|
|
INIT_LIST_HEAD(&sctx->name_cache_list);
|
|
|
|
sctx->send_filp = fget(arg->send_fd);
|
|
if (IS_ERR(sctx->send_filp)) {
|
|
ret = PTR_ERR(sctx->send_filp);
|
|
goto out;
|
|
}
|
|
|
|
sctx->mnt = mnt_file->f_path.mnt;
|
|
|
|
sctx->send_root = send_root;
|
|
sctx->clone_roots_cnt = arg->clone_sources_count;
|
|
|
|
sctx->send_max_size = BTRFS_SEND_BUF_SIZE;
|
|
sctx->send_buf = vmalloc(sctx->send_max_size);
|
|
if (!sctx->send_buf) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
sctx->read_buf = vmalloc(BTRFS_SEND_READ_SIZE);
|
|
if (!sctx->read_buf) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
sctx->clone_roots = vzalloc(sizeof(struct clone_root) *
|
|
(arg->clone_sources_count + 1));
|
|
if (!sctx->clone_roots) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (arg->clone_sources_count) {
|
|
clone_sources_tmp = vmalloc(arg->clone_sources_count *
|
|
sizeof(*arg->clone_sources));
|
|
if (!clone_sources_tmp) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
ret = copy_from_user(clone_sources_tmp, arg->clone_sources,
|
|
arg->clone_sources_count *
|
|
sizeof(*arg->clone_sources));
|
|
if (ret) {
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < arg->clone_sources_count; i++) {
|
|
key.objectid = clone_sources_tmp[i];
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
key.offset = (u64)-1;
|
|
clone_root = btrfs_read_fs_root_no_name(fs_info, &key);
|
|
if (!clone_root) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (IS_ERR(clone_root)) {
|
|
ret = PTR_ERR(clone_root);
|
|
goto out;
|
|
}
|
|
sctx->clone_roots[i].root = clone_root;
|
|
}
|
|
vfree(clone_sources_tmp);
|
|
clone_sources_tmp = NULL;
|
|
}
|
|
|
|
if (arg->parent_root) {
|
|
key.objectid = arg->parent_root;
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
key.offset = (u64)-1;
|
|
sctx->parent_root = btrfs_read_fs_root_no_name(fs_info, &key);
|
|
if (!sctx->parent_root) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Clones from send_root are allowed, but only if the clone source
|
|
* is behind the current send position. This is checked while searching
|
|
* for possible clone sources.
|
|
*/
|
|
sctx->clone_roots[sctx->clone_roots_cnt++].root = sctx->send_root;
|
|
|
|
/* We do a bsearch later */
|
|
sort(sctx->clone_roots, sctx->clone_roots_cnt,
|
|
sizeof(*sctx->clone_roots), __clone_root_cmp_sort,
|
|
NULL);
|
|
|
|
ret = send_subvol(sctx);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = begin_cmd(sctx, BTRFS_SEND_C_END);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = send_cmd(sctx);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
out:
|
|
if (filp)
|
|
fput(filp);
|
|
kfree(arg);
|
|
vfree(clone_sources_tmp);
|
|
|
|
if (sctx) {
|
|
if (sctx->send_filp)
|
|
fput(sctx->send_filp);
|
|
|
|
vfree(sctx->clone_roots);
|
|
vfree(sctx->send_buf);
|
|
vfree(sctx->read_buf);
|
|
|
|
name_cache_free(sctx);
|
|
|
|
kfree(sctx);
|
|
}
|
|
|
|
return ret;
|
|
}
|