btrfs-progs/send-dump.c

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/*
* Copyright (C) 2016 Fujitsu. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program.
*/
#include <unistd.h>
#include <stdint.h>
#include <dirent.h>
#include <pthread.h>
#include <math.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <libgen.h>
#include <mntent.h>
#include <limits.h>
#include <stdlib.h>
#include <time.h>
#include <ctype.h>
#include <asm/types.h>
#include <uuid/uuid.h>
#include "utils.h"
#include "commands.h"
#include "send-utils.h"
#include "send-stream.h"
#include "send-dump.h"
#define PATH_CAT_OR_RET(function_name, outpath, path1, path2, ret) \
({ \
ret = path_cat_out(outpath, path1, path2); \
if (ret < 0) { \
error("%s: path invalid: %s\n", function_name, path2); \
return ret; \
} \
})
/*
* Print path and escape characters (in a C way) that could break the line.
* Returns the length of the escaped characters. Unprintable characters are
* escaped as octals.
*/
static int print_path_escaped(const char *path)
{
size_t i;
size_t path_len = strlen(path);
int len = 0;
for (i = 0; i < path_len; i++) {
char c = path[i];
len++;
switch (c) {
case '\a': putchar('\\'); putchar('a'); len++; break;
case '\b': putchar('\\'); putchar('b'); len++; break;
case '\e': putchar('\\'); putchar('e'); len++; break;
case '\f': putchar('\\'); putchar('f'); len++; break;
case '\n': putchar('\\'); putchar('n'); len++; break;
case '\r': putchar('\\'); putchar('r'); len++; break;
case '\t': putchar('\\'); putchar('t'); len++; break;
case '\v': putchar('\\'); putchar('v'); len++; break;
case ' ': putchar('\\'); putchar(' '); len++; break;
case '\\': putchar('\\'); putchar('\\'); len++; break;
default:
if (!isprint(c)) {
printf("\\%c%c%c",
'0' + ((c & 0300) >> 6),
'0' + ((c & 070) >> 3),
'0' + (c & 07));
len += 3;
} else {
putchar(c);
}
}
}
return len;
}
/*
* Underlying PRINT_DUMP, the only difference is how we handle
* the full path.
*/
__attribute__ ((format (printf, 5, 6)))
static int __print_dump(int subvol, void *user, const char *path,
const char *title, const char *fmt, ...)
{
struct btrfs_dump_send_args *r = user;
char full_path[PATH_MAX] = {0};
char *out_path;
va_list args;
int ret;
if (subvol) {
PATH_CAT_OR_RET(title, r->full_subvol_path, r->root_path, path, ret);
out_path = r->full_subvol_path;
} else {
PATH_CAT_OR_RET(title, full_path, r->full_subvol_path, path, ret);
out_path = full_path;
}
/* Unified header */
printf("%-16s", title);
ret = print_path_escaped(out_path);
if (!fmt) {
putchar('\n');
return 0;
}
/* Short paths are aligned to 32 chars; longer paths get a single space */
do {
putchar(' ');
} while (++ret < 32);
va_start(args, fmt);
/* Operation specified ones */
vprintf(fmt, args);
va_end(args);
putchar('\n');
return 0;
}
/* For subvolume/snapshot operation only */
#define PRINT_DUMP_SUBVOL(user, path, title, fmt, ...) \
__print_dump(1, user, path, title, fmt, ##__VA_ARGS__)
/* For other operations */
#define PRINT_DUMP(user, path, title, fmt, ...) \
__print_dump(0, user, path, title, fmt, ##__VA_ARGS__)
static int print_subvol(const char *path, const u8 *uuid, u64 ctransid,
void *user)
{
char uuid_str[BTRFS_UUID_UNPARSED_SIZE];
uuid_unparse(uuid, uuid_str);
return PRINT_DUMP_SUBVOL(user, path, "subvol", "uuid=%s transid=%llu",
uuid_str, ctransid);
}
static int print_snapshot(const char *path, const u8 *uuid, u64 ctransid,
const u8 *parent_uuid, u64 parent_ctransid,
void *user)
{
char uuid_str[BTRFS_UUID_UNPARSED_SIZE];
char parent_uuid_str[BTRFS_UUID_UNPARSED_SIZE];
int ret;
uuid_unparse(uuid, uuid_str);
uuid_unparse(parent_uuid, parent_uuid_str);
ret = PRINT_DUMP_SUBVOL(user, path, "snapshot",
"uuid=%s transid=%llu parent_uuid=%s parent_transid=%llu",
uuid_str, ctransid, parent_uuid_str,
parent_ctransid);
return ret;
}
static int print_mkfile(const char *path, void *user)
{
return PRINT_DUMP(user, path, "mkfile", NULL);
}
static int print_mkdir(const char *path, void *user)
{
return PRINT_DUMP(user, path, "mkdir", NULL);
}
static int print_mknod(const char *path, u64 mode, u64 dev, void *user)
{
return PRINT_DUMP(user, path, "mknod", "mode=%llo dev=0x%llx", mode,
dev);
}
static int print_mkfifo(const char *path, void *user)
{
return PRINT_DUMP(user, path, "mkfifo", NULL);
}
static int print_mksock(const char *path, void *user)
{
return PRINT_DUMP(user, path, "mksock", NULL);
}
static int print_symlink(const char *path, const char *lnk, void *user)
{
return PRINT_DUMP(user, path, "symlink", "dest=%s", lnk);
}
static int print_rename(const char *from, const char *to, void *user)
{
struct btrfs_dump_send_args *r = user;
char full_to[PATH_MAX];
int ret;
PATH_CAT_OR_RET("rename", full_to, r->full_subvol_path, to, ret);
return PRINT_DUMP(user, from, "rename", "dest=%s", full_to);
}
static int print_link(const char *path, const char *lnk, void *user)
{
return PRINT_DUMP(user, path, "link", "dest=%s", lnk);
}
static int print_unlink(const char *path, void *user)
{
return PRINT_DUMP(user, path, "unlink", NULL);
}
static int print_rmdir(const char *path, void *user)
{
return PRINT_DUMP(user, path, "rmdir", NULL);
}
static int print_write(const char *path, const void *data, u64 offset,
u64 len, void *user)
{
return PRINT_DUMP(user, path, "write", "offset=%llu len=%llu",
offset, len);
}
static int print_clone(const char *path, u64 offset, u64 len,
const u8 *clone_uuid, u64 clone_ctransid,
const char *clone_path, u64 clone_offset,
void *user)
{
struct btrfs_dump_send_args *r = user;
char full_path[PATH_MAX];
int ret;
PATH_CAT_OR_RET("clone", full_path, r->full_subvol_path, clone_path,
ret);
return PRINT_DUMP(user, path, "clone",
"offset=%llu len=%llu from=%s clone_offset=%llu",
offset, len, full_path, clone_offset);
}
static int print_set_xattr(const char *path, const char *name,
const void *data, int len, void *user)
{
return PRINT_DUMP(user, path, "set_xattr", "name=%s data=%.*s len=%d",
name, len, (char *)data, len);
}
static int print_remove_xattr(const char *path, const char *name, void *user)
{
return PRINT_DUMP(user, path, "remove_xattr", "name=%s", name);
}
static int print_truncate(const char *path, u64 size, void *user)
{
return PRINT_DUMP(user, path, "truncate", "size=%llu", size);
}
static int print_chmod(const char *path, u64 mode, void *user)
{
return PRINT_DUMP(user, path, "chmod", "mode=%llo", mode);
}
static int print_chown(const char *path, u64 uid, u64 gid, void *user)
{
return PRINT_DUMP(user, path, "chown", "gid=%llu uid=%llu", gid, uid);
}
static int sprintf_timespec(struct timespec *ts, char *dest, int max_size)
{
struct tm tm;
int ret;
if (!localtime_r(&ts->tv_sec, &tm)) {
error("failed to convert time %lld.%.9ld to local time",
(long long)ts->tv_sec, ts->tv_nsec);
return -EINVAL;
}
ret = strftime(dest, max_size, "%FT%T%z", &tm);
if (ret == 0) {
error(
"time %lld.%ld is too long to convert into readable string",
(long long)ts->tv_sec, ts->tv_nsec);
return -EINVAL;
}
return 0;
}
#define TIME_STRING_MAX 64
static int print_utimes(const char *path, struct timespec *at,
struct timespec *mt, struct timespec *ct,
void *user)
{
char at_str[TIME_STRING_MAX];
char mt_str[TIME_STRING_MAX];
char ct_str[TIME_STRING_MAX];
if (sprintf_timespec(at, at_str, TIME_STRING_MAX - 1) < 0 ||
sprintf_timespec(mt, mt_str, TIME_STRING_MAX - 1) < 0 ||
sprintf_timespec(ct, ct_str, TIME_STRING_MAX - 1) < 0)
return -EINVAL;
return PRINT_DUMP(user, path, "utimes", "atime=%s mtime=%s ctime=%s",
at_str, mt_str, ct_str);
}
static int print_update_extent(const char *path, u64 offset, u64 len,
void *user)
{
return PRINT_DUMP(user, path, "update_extent", "offset=%llu len=%llu",
offset, len);
}
struct btrfs_send_ops btrfs_print_send_ops = {
.subvol = print_subvol,
.snapshot = print_snapshot,
.mkfile = print_mkfile,
.mkdir = print_mkdir,
.mknod = print_mknod,
.mkfifo = print_mkfifo,
.mksock = print_mksock,
.symlink = print_symlink,
.rename = print_rename,
.link = print_link,
.unlink = print_unlink,
.rmdir = print_rmdir,
.write = print_write,
.clone = print_clone,
.set_xattr = print_set_xattr,
.remove_xattr = print_remove_xattr,
.truncate = print_truncate,
.chmod = print_chmod,
.chown = print_chown,
.utimes = print_utimes,
.update_extent = print_update_extent
};