2 * Copyright (C) 2007 Oracle. All rights reserved.
3 * Copyright (C) 2008 Morey Roof. All rights reserved.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public
7 * License v2 as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public
15 * License along with this program; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 021110-1307, USA.
23 #include <sys/ioctl.h>
24 #include <sys/mount.h>
25 #include <sys/types.h>
27 #include <sys/sysinfo.h>
28 #include <uuid/uuid.h>
33 #include <linux/loop.h>
34 #include <linux/major.h>
35 #include <linux/kdev_t.h>
37 #include <blkid/blkid.h>
39 #include <sys/statfs.h>
40 #include <linux/magic.h>
43 #include "kerncompat.h"
44 #include "radix-tree.h"
47 #include "transaction.h"
53 #include "mkfs/common.h"
56 #define BLKDISCARD _IO(0x12,119)
59 static int btrfs_scan_done = 0;
61 static int rand_seed_initlized = 0;
62 static unsigned short rand_seed[3];
64 struct btrfs_config bconf;
67 * Discard the given range in one go
69 static int discard_range(int fd, u64 start, u64 len)
71 u64 range[2] = { start, len };
73 if (ioctl(fd, BLKDISCARD, &range) < 0)
79 * Discard blocks in the given range in 1G chunks, the process is interruptible
81 static int discard_blocks(int fd, u64 start, u64 len)
85 u64 chunk_size = min_t(u64, len, SZ_1G);
88 ret = discard_range(fd, start, chunk_size);
98 int test_uuid_unique(char *fs_uuid)
101 blkid_dev_iterate iter = NULL;
102 blkid_dev dev = NULL;
103 blkid_cache cache = NULL;
105 if (blkid_get_cache(&cache, NULL) < 0) {
106 printf("ERROR: lblkid cache get failed\n");
109 blkid_probe_all(cache);
110 iter = blkid_dev_iterate_begin(cache);
111 blkid_dev_set_search(iter, "UUID", fs_uuid);
113 while (blkid_dev_next(iter, &dev) == 0) {
114 dev = blkid_verify(cache, dev);
121 blkid_dev_iterate_end(iter);
122 blkid_put_cache(cache);
127 u64 btrfs_device_size(int fd, struct stat *st)
130 if (S_ISREG(st->st_mode)) {
133 if (!S_ISBLK(st->st_mode)) {
136 if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
142 static int zero_blocks(int fd, off_t start, size_t len)
144 char *buf = malloc(len);
151 written = pwrite(fd, buf, len, start);
158 #define ZERO_DEV_BYTES SZ_2M
160 /* don't write outside the device by clamping the region to the device size */
161 static int zero_dev_clamped(int fd, off_t start, ssize_t len, u64 dev_size)
163 off_t end = max(start, start + len);
166 /* and don't overwrite the disk labels on sparc */
167 start = max(start, 1024);
168 end = max(end, 1024);
171 start = min_t(u64, start, dev_size);
172 end = min_t(u64, end, dev_size);
174 return zero_blocks(fd, start, end - start);
177 int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
178 struct btrfs_root *root, int fd, const char *path,
179 u64 device_total_bytes, u32 io_width, u32 io_align,
182 struct btrfs_super_block *disk_super;
183 struct btrfs_fs_info *fs_info = root->fs_info;
184 struct btrfs_super_block *super = fs_info->super_copy;
185 struct btrfs_device *device;
186 struct btrfs_dev_item *dev_item;
192 device_total_bytes = (device_total_bytes / sectorsize) * sectorsize;
194 device = calloc(1, sizeof(*device));
199 buf = calloc(1, sectorsize);
205 disk_super = (struct btrfs_super_block *)buf;
206 dev_item = &disk_super->dev_item;
208 uuid_generate(device->uuid);
211 device->io_width = io_width;
212 device->io_align = io_align;
213 device->sector_size = sectorsize;
215 device->writeable = 1;
216 device->total_bytes = device_total_bytes;
217 device->bytes_used = 0;
218 device->total_ios = 0;
219 device->dev_root = fs_info->dev_root;
220 device->name = strdup(path);
226 INIT_LIST_HEAD(&device->dev_list);
227 ret = btrfs_add_device(trans, fs_info, device);
231 fs_total_bytes = btrfs_super_total_bytes(super) + device_total_bytes;
232 btrfs_set_super_total_bytes(super, fs_total_bytes);
234 num_devs = btrfs_super_num_devices(super) + 1;
235 btrfs_set_super_num_devices(super, num_devs);
237 memcpy(disk_super, super, sizeof(*disk_super));
239 btrfs_set_super_bytenr(disk_super, BTRFS_SUPER_INFO_OFFSET);
240 btrfs_set_stack_device_id(dev_item, device->devid);
241 btrfs_set_stack_device_type(dev_item, device->type);
242 btrfs_set_stack_device_io_align(dev_item, device->io_align);
243 btrfs_set_stack_device_io_width(dev_item, device->io_width);
244 btrfs_set_stack_device_sector_size(dev_item, device->sector_size);
245 btrfs_set_stack_device_total_bytes(dev_item, device->total_bytes);
246 btrfs_set_stack_device_bytes_used(dev_item, device->bytes_used);
247 memcpy(&dev_item->uuid, device->uuid, BTRFS_UUID_SIZE);
249 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
250 BUG_ON(ret != sectorsize);
253 list_add(&device->dev_list, &fs_info->fs_devices->devices);
254 device->fs_devices = fs_info->fs_devices;
263 static int btrfs_wipe_existing_sb(int fd)
265 const char *off = NULL;
270 blkid_probe pr = NULL;
272 pr = blkid_new_probe();
276 if (blkid_probe_set_device(pr, fd, 0, 0)) {
281 ret = blkid_probe_lookup_value(pr, "SBMAGIC_OFFSET", &off, NULL);
283 ret = blkid_probe_lookup_value(pr, "SBMAGIC", NULL, &len);
285 if (ret || len == 0 || off == NULL) {
287 * If lookup fails, the probe did not find any values, eg. for
288 * a file image or a loop device. Soft error.
294 offset = strtoll(off, NULL, 10);
295 if (len > sizeof(buf))
299 ret = pwrite(fd, buf, len, offset);
301 error("cannot wipe existing superblock: %s", strerror(errno));
303 } else if (ret != len) {
304 error("cannot wipe existing superblock: wrote %d of %zd", ret, len);
310 blkid_free_probe(pr);
314 int btrfs_prepare_device(int fd, const char *file, u64 *block_count_ret,
315 u64 max_block_count, unsigned opflags)
321 ret = fstat(fd, &st);
323 error("unable to stat %s: %s", file, strerror(errno));
327 block_count = btrfs_device_size(fd, &st);
328 if (block_count == 0) {
329 error("unable to determine size of %s", file);
333 block_count = min(block_count, max_block_count);
335 if (opflags & PREP_DEVICE_DISCARD) {
337 * We intentionally ignore errors from the discard ioctl. It
338 * is not necessary for the mkfs functionality but just an
341 if (discard_range(fd, 0, 0) == 0) {
342 if (opflags & PREP_DEVICE_VERBOSE)
343 printf("Performing full device TRIM %s (%s) ...\n",
344 file, pretty_size(block_count));
345 discard_blocks(fd, 0, block_count);
349 ret = zero_dev_clamped(fd, 0, ZERO_DEV_BYTES, block_count);
350 for (i = 0 ; !ret && i < BTRFS_SUPER_MIRROR_MAX; i++)
351 ret = zero_dev_clamped(fd, btrfs_sb_offset(i),
352 BTRFS_SUPER_INFO_SIZE, block_count);
353 if (!ret && (opflags & PREP_DEVICE_ZERO_END))
354 ret = zero_dev_clamped(fd, block_count - ZERO_DEV_BYTES,
355 ZERO_DEV_BYTES, block_count);
358 error("failed to zero device '%s': %s", file, strerror(-ret));
362 ret = btrfs_wipe_existing_sb(fd);
364 error("cannot wipe superblocks on %s", file);
368 *block_count_ret = block_count;
372 int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
373 struct btrfs_root *root, u64 objectid)
376 struct btrfs_inode_item inode_item;
377 time_t now = time(NULL);
379 memset(&inode_item, 0, sizeof(inode_item));
380 btrfs_set_stack_inode_generation(&inode_item, trans->transid);
381 btrfs_set_stack_inode_size(&inode_item, 0);
382 btrfs_set_stack_inode_nlink(&inode_item, 1);
383 btrfs_set_stack_inode_nbytes(&inode_item, root->fs_info->nodesize);
384 btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0755);
385 btrfs_set_stack_timespec_sec(&inode_item.atime, now);
386 btrfs_set_stack_timespec_nsec(&inode_item.atime, 0);
387 btrfs_set_stack_timespec_sec(&inode_item.ctime, now);
388 btrfs_set_stack_timespec_nsec(&inode_item.ctime, 0);
389 btrfs_set_stack_timespec_sec(&inode_item.mtime, now);
390 btrfs_set_stack_timespec_nsec(&inode_item.mtime, 0);
391 btrfs_set_stack_timespec_sec(&inode_item.otime, now);
392 btrfs_set_stack_timespec_nsec(&inode_item.otime, 0);
394 if (root->fs_info->tree_root == root)
395 btrfs_set_super_root_dir(root->fs_info->super_copy, objectid);
397 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
401 ret = btrfs_insert_inode_ref(trans, root, "..", 2, objectid, objectid, 0);
405 btrfs_set_root_dirid(&root->root_item, objectid);
412 * checks if a path is a block device node
413 * Returns negative errno on failure, otherwise
414 * returns 1 for blockdev, 0 for not-blockdev
416 int is_block_device(const char *path)
420 if (stat(path, &statbuf) < 0)
423 return !!S_ISBLK(statbuf.st_mode);
427 * check if given path is a mount point
428 * return 1 if yes. 0 if no. -1 for error
430 int is_mount_point(const char *path)
436 f = setmntent("/proc/self/mounts", "r");
440 while ((mnt = getmntent(f)) != NULL) {
441 if (strcmp(mnt->mnt_dir, path))
450 int is_reg_file(const char *path)
454 if (stat(path, &statbuf) < 0)
456 return S_ISREG(statbuf.st_mode);
459 int is_path_exist(const char *path)
464 ret = stat(path, &statbuf);
475 * This function checks if the given input parameter is
477 * return <0 : some error in the given input
478 * return BTRFS_ARG_UNKNOWN: unknown input
479 * return BTRFS_ARG_UUID: given input is uuid
480 * return BTRFS_ARG_MNTPOINT: given input is path
481 * return BTRFS_ARG_REG: given input is regular file
482 * return BTRFS_ARG_BLKDEV: given input is block device
484 int check_arg_type(const char *input)
492 if (realpath(input, path)) {
493 if (is_block_device(path) == 1)
494 return BTRFS_ARG_BLKDEV;
496 if (is_mount_point(path) == 1)
497 return BTRFS_ARG_MNTPOINT;
499 if (is_reg_file(path))
500 return BTRFS_ARG_REG;
502 return BTRFS_ARG_UNKNOWN;
505 if (strlen(input) == (BTRFS_UUID_UNPARSED_SIZE - 1) &&
506 !uuid_parse(input, uuid))
507 return BTRFS_ARG_UUID;
509 return BTRFS_ARG_UNKNOWN;
513 * Find the mount point for a mounted device.
514 * On success, returns 0 with mountpoint in *mp.
515 * On failure, returns -errno (not mounted yields -EINVAL)
516 * Is noisy on failures, expects to be given a mounted device.
518 int get_btrfs_mount(const char *dev, char *mp, size_t mp_size)
523 ret = is_block_device(dev);
526 error("not a block device: %s", dev);
529 error("cannot check %s: %s", dev, strerror(-ret));
534 fd = open(dev, O_RDONLY);
537 error("cannot open %s: %s", dev, strerror(errno));
541 ret = check_mounted_where(fd, dev, mp, mp_size, NULL);
544 } else { /* mounted, all good */
554 * Given a pathname, return a filehandle to:
555 * the original pathname or,
556 * if the pathname is a mounted btrfs device, to its mountpoint.
558 * On error, return -1, errno should be set.
560 int open_path_or_dev_mnt(const char *path, DIR **dirstream, int verbose)
565 if (is_block_device(path)) {
566 ret = get_btrfs_mount(path, mp, sizeof(mp));
568 /* not a mounted btrfs dev */
569 error_on(verbose, "'%s' is not a mounted btrfs device",
574 ret = open_file_or_dir(mp, dirstream);
575 error_on(verbose && ret < 0, "can't access '%s': %s",
576 path, strerror(errno));
578 ret = btrfs_open_dir(path, dirstream, 1);
585 * Do the following checks before calling open_file_or_dir():
586 * 1: path is in a btrfs filesystem
587 * 2: path is a directory if dir_only is 1
589 int btrfs_open(const char *path, DIR **dirstream, int verbose, int dir_only)
595 if (statfs(path, &stfs) != 0) {
596 error_on(verbose, "cannot access '%s': %s", path,
601 if (stfs.f_type != BTRFS_SUPER_MAGIC) {
602 error_on(verbose, "not a btrfs filesystem: %s", path);
606 if (stat(path, &st) != 0) {
607 error_on(verbose, "cannot access '%s': %s", path,
612 if (dir_only && !S_ISDIR(st.st_mode)) {
613 error_on(verbose, "not a directory: %s", path);
617 ret = open_file_or_dir(path, dirstream);
619 error_on(verbose, "cannot access '%s': %s", path,
626 int btrfs_open_dir(const char *path, DIR **dirstream, int verbose)
628 return btrfs_open(path, dirstream, verbose, 1);
631 int btrfs_open_file_or_dir(const char *path, DIR **dirstream, int verbose)
633 return btrfs_open(path, dirstream, verbose, 0);
636 /* checks if a device is a loop device */
637 static int is_loop_device (const char* device) {
640 if(stat(device, &statbuf) < 0)
643 return (S_ISBLK(statbuf.st_mode) &&
644 MAJOR(statbuf.st_rdev) == LOOP_MAJOR);
648 * Takes a loop device path (e.g. /dev/loop0) and returns
649 * the associated file (e.g. /images/my_btrfs.img) using
652 static int resolve_loop_device_with_loopdev(const char* loop_dev, char* loop_file)
656 struct loop_info64 lo64;
658 fd = open(loop_dev, O_RDONLY | O_NONBLOCK);
661 ret = ioctl(fd, LOOP_GET_STATUS64, &lo64);
667 memcpy(loop_file, lo64.lo_file_name, sizeof(lo64.lo_file_name));
668 loop_file[sizeof(lo64.lo_file_name)] = 0;
676 /* Takes a loop device path (e.g. /dev/loop0) and returns
677 * the associated file (e.g. /images/my_btrfs.img) */
678 static int resolve_loop_device(const char* loop_dev, char* loop_file,
685 char real_loop_dev[PATH_MAX];
687 if (!realpath(loop_dev, real_loop_dev))
689 snprintf(p, PATH_MAX, "/sys/block/%s/loop/backing_file", strrchr(real_loop_dev, '/'));
690 if (!(f = fopen(p, "r"))) {
693 * It's possibly a partitioned loop device, which is
694 * resolvable with loopdev API.
696 return resolve_loop_device_with_loopdev(loop_dev, loop_file);
700 snprintf(fmt, 20, "%%%i[^\n]", max_len-1);
701 ret = fscanf(f, fmt, loop_file);
710 * Checks whether a and b are identical or device
711 * files associated with the same block device
713 static int is_same_blk_file(const char* a, const char* b)
715 struct stat st_buf_a, st_buf_b;
716 char real_a[PATH_MAX];
717 char real_b[PATH_MAX];
719 if (!realpath(a, real_a))
720 strncpy_null(real_a, a);
722 if (!realpath(b, real_b))
723 strncpy_null(real_b, b);
725 /* Identical path? */
726 if (strcmp(real_a, real_b) == 0)
729 if (stat(a, &st_buf_a) < 0 || stat(b, &st_buf_b) < 0) {
735 /* Same blockdevice? */
736 if (S_ISBLK(st_buf_a.st_mode) && S_ISBLK(st_buf_b.st_mode) &&
737 st_buf_a.st_rdev == st_buf_b.st_rdev) {
742 if (st_buf_a.st_dev == st_buf_b.st_dev &&
743 st_buf_a.st_ino == st_buf_b.st_ino) {
750 /* checks if a and b are identical or device
751 * files associated with the same block device or
752 * if one file is a loop device that uses the other
755 static int is_same_loop_file(const char* a, const char* b)
757 char res_a[PATH_MAX];
758 char res_b[PATH_MAX];
759 const char* final_a = NULL;
760 const char* final_b = NULL;
763 /* Resolve a if it is a loop device */
764 if((ret = is_loop_device(a)) < 0) {
769 ret = resolve_loop_device(a, res_a, sizeof(res_a));
780 /* Resolve b if it is a loop device */
781 if ((ret = is_loop_device(b)) < 0) {
786 ret = resolve_loop_device(b, res_b, sizeof(res_b));
797 return is_same_blk_file(final_a, final_b);
800 /* Checks if a file exists and is a block or regular file*/
801 static int is_existing_blk_or_reg_file(const char* filename)
805 if(stat(filename, &st_buf) < 0) {
812 return (S_ISBLK(st_buf.st_mode) || S_ISREG(st_buf.st_mode));
815 /* Checks if a file is used (directly or indirectly via a loop device)
816 * by a device in fs_devices
818 static int blk_file_in_dev_list(struct btrfs_fs_devices* fs_devices,
822 struct btrfs_device *device;
824 list_for_each_entry(device, &fs_devices->devices, dev_list) {
825 if((ret = is_same_loop_file(device->name, file)))
833 * Resolve a pathname to a device mapper node to /dev/mapper/<name>
834 * Returns NULL on invalid input or malloc failure; Other failures
835 * will be handled by the caller using the input pathame.
837 char *canonicalize_dm_name(const char *ptname)
841 char path[PATH_MAX], name[PATH_MAX], *res = NULL;
843 if (!ptname || !*ptname)
846 snprintf(path, sizeof(path), "/sys/block/%s/dm/name", ptname);
847 if (!(f = fopen(path, "r")))
850 /* read <name>\n from sysfs */
851 if (fgets(name, sizeof(name), f) && (sz = strlen(name)) > 1) {
853 snprintf(path, sizeof(path), "/dev/mapper/%s", name);
855 if (access(path, F_OK) == 0)
863 * Resolve a pathname to a canonical device node, e.g. /dev/sda1 or
864 * to a device mapper pathname.
865 * Returns NULL on invalid input or malloc failure; Other failures
866 * will be handled by the caller using the input pathame.
868 char *canonicalize_path(const char *path)
875 canonical = realpath(path, NULL);
878 p = strrchr(canonical, '/');
879 if (p && strncmp(p, "/dm-", 4) == 0 && isdigit(*(p + 4))) {
880 char *dm = canonicalize_dm_name(p + 1);
891 * returns 1 if the device was mounted, < 0 on error or 0 if everything
892 * is safe to continue.
894 int check_mounted(const char* file)
899 fd = open(file, O_RDONLY);
901 error("mount check: cannot open %s: %s", file,
906 ret = check_mounted_where(fd, file, NULL, 0, NULL);
912 int check_mounted_where(int fd, const char *file, char *where, int size,
913 struct btrfs_fs_devices **fs_dev_ret)
918 struct btrfs_fs_devices *fs_devices_mnt = NULL;
922 /* scan the initial device */
923 ret = btrfs_scan_one_device(fd, file, &fs_devices_mnt,
924 &total_devs, BTRFS_SUPER_INFO_OFFSET, SBREAD_DEFAULT);
925 is_btrfs = (ret >= 0);
927 /* scan other devices */
928 if (is_btrfs && total_devs > 1) {
929 ret = btrfs_scan_devices();
934 /* iterate over the list of currently mounted filesystems */
935 if ((f = setmntent ("/proc/self/mounts", "r")) == NULL)
938 while ((mnt = getmntent (f)) != NULL) {
940 if(strcmp(mnt->mnt_type, "btrfs") != 0)
943 ret = blk_file_in_dev_list(fs_devices_mnt, mnt->mnt_fsname);
945 /* ignore entries in the mount table that are not
946 associated with a file*/
947 if((ret = is_existing_blk_or_reg_file(mnt->mnt_fsname)) < 0)
948 goto out_mntloop_err;
952 ret = is_same_loop_file(file, mnt->mnt_fsname);
956 goto out_mntloop_err;
961 /* Did we find an entry in mnt table? */
962 if (mnt && size && where) {
963 strncpy(where, mnt->mnt_dir, size);
967 *fs_dev_ret = fs_devices_mnt;
978 struct list_head list;
982 int btrfs_register_one_device(const char *fname)
984 struct btrfs_ioctl_vol_args args;
988 fd = open("/dev/btrfs-control", O_RDWR);
991 "failed to open /dev/btrfs-control, skipping device registration: %s",
995 memset(&args, 0, sizeof(args));
996 strncpy_null(args.name, fname);
997 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
999 error("device scan failed on '%s': %s", fname,
1008 * Register all devices in the fs_uuid list created in the user
1009 * space. Ensure btrfs_scan_devices() is called before this func.
1011 int btrfs_register_all_devices(void)
1015 struct btrfs_fs_devices *fs_devices;
1016 struct btrfs_device *device;
1017 struct list_head *all_uuids;
1019 all_uuids = btrfs_scanned_uuids();
1021 list_for_each_entry(fs_devices, all_uuids, list) {
1022 list_for_each_entry(device, &fs_devices->devices, dev_list) {
1024 err = btrfs_register_one_device(device->name);
1034 int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
1037 struct btrfs_super_block *disk_super;
1041 buf = malloc(BTRFS_SUPER_INFO_SIZE);
1046 ret = pread(fd, buf, BTRFS_SUPER_INFO_SIZE, super_offset);
1047 if (ret != BTRFS_SUPER_INFO_SIZE)
1051 disk_super = (struct btrfs_super_block *)buf;
1053 * Accept devices from the same filesystem, allow partially created
1056 if (btrfs_super_magic(disk_super) != BTRFS_MAGIC &&
1057 btrfs_super_magic(disk_super) != BTRFS_MAGIC_PARTIAL)
1060 if (!memcmp(disk_super->fsid, root->fs_info->super_copy->fsid,
1070 * Note: this function uses a static per-thread buffer. Do not call this
1071 * function more than 10 times within one argument list!
1073 const char *pretty_size_mode(u64 size, unsigned mode)
1075 static __thread int ps_index = 0;
1076 static __thread char ps_array[10][32];
1079 ret = ps_array[ps_index];
1082 (void)pretty_size_snprintf(size, ret, 32, mode);
1087 static const char* unit_suffix_binary[] =
1088 { "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
1089 static const char* unit_suffix_decimal[] =
1090 { "B", "kB", "MB", "GB", "TB", "PB", "EB"};
1092 int pretty_size_snprintf(u64 size, char *str, size_t str_size, unsigned unit_mode)
1098 const char** suffix = NULL;
1105 negative = !!(unit_mode & UNITS_NEGATIVE);
1106 unit_mode &= ~UNITS_NEGATIVE;
1108 if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_RAW) {
1110 snprintf(str, str_size, "%lld", size);
1112 snprintf(str, str_size, "%llu", size);
1116 if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_BINARY) {
1119 suffix = unit_suffix_binary;
1120 } else if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_DECIMAL) {
1123 suffix = unit_suffix_decimal;
1128 fprintf(stderr, "INTERNAL ERROR: unknown unit base, mode %d\n",
1136 switch (unit_mode & UNITS_MODE_MASK) {
1137 case UNITS_TBYTES: base *= mult; num_divs++;
1138 case UNITS_GBYTES: base *= mult; num_divs++;
1139 case UNITS_MBYTES: base *= mult; num_divs++;
1140 case UNITS_KBYTES: num_divs++;
1148 s64 ssize = (s64)size;
1149 s64 last_ssize = ssize;
1151 while ((ssize < 0 ? -ssize : ssize) >= mult) {
1156 last_size = (u64)last_ssize;
1158 while (size >= mult) {
1165 * If the value is smaller than base, we didn't do any
1166 * division, in that case, base should be 1, not original
1167 * base, or the unit will be wrong
1173 if (num_divs >= ARRAY_SIZE(unit_suffix_binary)) {
1175 printf("INTERNAL ERROR: unsupported unit suffix, index %d\n",
1182 fraction = (float)(s64)last_size / base;
1184 fraction = (float)last_size / base;
1187 return snprintf(str, str_size, "%.2f%s", fraction, suffix[num_divs]);
1191 * __strncpy_null - strncpy with null termination
1192 * @dest: the target array
1193 * @src: the source string
1194 * @n: maximum bytes to copy (size of *dest)
1196 * Like strncpy, but ensures destination is null-terminated.
1198 * Copies the string pointed to by src, including the terminating null
1199 * byte ('\0'), to the buffer pointed to by dest, up to a maximum
1200 * of n bytes. Then ensure that dest is null-terminated.
1202 char *__strncpy_null(char *dest, const char *src, size_t n)
1204 strncpy(dest, src, n);
1211 * Checks to make sure that the label matches our requirements.
1213 0 if everything is safe and usable
1214 -1 if the label is too long
1216 static int check_label(const char *input)
1218 int len = strlen(input);
1220 if (len > BTRFS_LABEL_SIZE - 1) {
1221 error("label %s is too long (max %d)", input,
1222 BTRFS_LABEL_SIZE - 1);
1229 static int set_label_unmounted(const char *dev, const char *label)
1231 struct btrfs_trans_handle *trans;
1232 struct btrfs_root *root;
1235 ret = check_mounted(dev);
1237 error("checking mount status of %s failed: %d", dev, ret);
1241 error("device %s is mounted, use mount point", dev);
1245 /* Open the super_block at the default location
1246 * and as read-write.
1248 root = open_ctree(dev, 0, OPEN_CTREE_WRITES);
1249 if (!root) /* errors are printed by open_ctree() */
1252 trans = btrfs_start_transaction(root, 1);
1253 BUG_ON(IS_ERR(trans));
1254 __strncpy_null(root->fs_info->super_copy->label, label, BTRFS_LABEL_SIZE - 1);
1256 btrfs_commit_transaction(trans, root);
1258 /* Now we close it since we are done. */
1263 static int set_label_mounted(const char *mount_path, const char *labelp)
1266 char label[BTRFS_LABEL_SIZE];
1268 fd = open(mount_path, O_RDONLY | O_NOATIME);
1270 error("unable to access %s: %s", mount_path, strerror(errno));
1274 memset(label, 0, sizeof(label));
1275 __strncpy_null(label, labelp, BTRFS_LABEL_SIZE - 1);
1276 if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
1277 error("unable to set label of %s: %s", mount_path,
1287 int get_label_unmounted(const char *dev, char *label)
1289 struct btrfs_root *root;
1292 ret = check_mounted(dev);
1294 error("checking mount status of %s failed: %d", dev, ret);
1298 /* Open the super_block at the default location
1301 root = open_ctree(dev, 0, 0);
1305 __strncpy_null(label, root->fs_info->super_copy->label,
1306 BTRFS_LABEL_SIZE - 1);
1308 /* Now we close it since we are done. */
1314 * If a partition is mounted, try to get the filesystem label via its
1315 * mounted path rather than device. Return the corresponding error
1316 * the user specified the device path.
1318 int get_label_mounted(const char *mount_path, char *labelp)
1320 char label[BTRFS_LABEL_SIZE];
1324 fd = open(mount_path, O_RDONLY | O_NOATIME);
1326 error("unable to access %s: %s", mount_path, strerror(errno));
1330 memset(label, '\0', sizeof(label));
1331 ret = ioctl(fd, BTRFS_IOC_GET_FSLABEL, label);
1333 if (errno != ENOTTY)
1334 error("unable to get label of %s: %s", mount_path,
1341 __strncpy_null(labelp, label, BTRFS_LABEL_SIZE - 1);
1346 int get_label(const char *btrfs_dev, char *label)
1350 ret = is_existing_blk_or_reg_file(btrfs_dev);
1352 ret = get_label_mounted(btrfs_dev, label);
1354 ret = get_label_unmounted(btrfs_dev, label);
1359 int set_label(const char *btrfs_dev, const char *label)
1363 if (check_label(label))
1366 ret = is_existing_blk_or_reg_file(btrfs_dev);
1368 ret = set_label_mounted(btrfs_dev, label);
1370 ret = set_label_unmounted(btrfs_dev, label);
1376 * A not-so-good version fls64. No fascinating optimization since
1377 * no one except parse_size use it
1379 static int fls64(u64 x)
1383 for (i = 0; i <64; i++)
1384 if (x << i & (1ULL << 63))
1389 u64 parse_size(char *s)
1397 error("size value is empty");
1401 error("size value '%s' is less equal than 0", s);
1404 ret = strtoull(s, &endptr, 10);
1406 error("size value '%s' is invalid", s);
1409 if (endptr[0] && endptr[1]) {
1410 error("illegal suffix contains character '%c' in wrong position",
1415 * strtoll returns LLONG_MAX when overflow, if this happens,
1416 * need to call strtoull to get the real size
1418 if (errno == ERANGE && ret == ULLONG_MAX) {
1419 error("size value '%s' is too large for u64", s);
1423 c = tolower(endptr[0]);
1446 error("unknown size descriptor '%c'", c);
1450 /* Check whether ret * mult overflow */
1451 if (fls64(ret) + fls64(mult) - 1 > 64) {
1452 error("size value '%s' is too large for u64", s);
1459 u64 parse_qgroupid(const char *p)
1461 char *s = strchr(p, '/');
1462 const char *ptr_src_end = p + strlen(p);
1463 char *ptr_parse_end = NULL;
1472 /* Numeric format like '0/257' is the primary case */
1474 id = strtoull(p, &ptr_parse_end, 10);
1475 if (ptr_parse_end != ptr_src_end)
1479 level = strtoull(p, &ptr_parse_end, 10);
1480 if (ptr_parse_end != s)
1483 id = strtoull(s + 1, &ptr_parse_end, 10);
1484 if (ptr_parse_end != ptr_src_end)
1487 return (level << BTRFS_QGROUP_LEVEL_SHIFT) | id;
1490 /* Path format like subv at 'my_subvol' is the fallback case */
1491 ret = test_issubvolume(p);
1492 if (ret < 0 || !ret)
1494 fd = open(p, O_RDONLY);
1497 ret = lookup_path_rootid(fd, &id);
1499 error("failed to lookup root id: %s", strerror(-ret));
1506 error("invalid qgroupid or subvolume path: %s", p);
1510 int open_file_or_dir3(const char *fname, DIR **dirstream, int open_flags)
1516 ret = stat(fname, &st);
1520 if (S_ISDIR(st.st_mode)) {
1521 *dirstream = opendir(fname);
1524 fd = dirfd(*dirstream);
1525 } else if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
1526 fd = open(fname, open_flags);
1529 * we set this on purpose, in case the caller output
1530 * strerror(errno) as success
1538 closedir(*dirstream);
1545 int open_file_or_dir(const char *fname, DIR **dirstream)
1547 return open_file_or_dir3(fname, dirstream, O_RDWR);
1550 void close_file_or_dir(int fd, DIR *dirstream)
1556 closedir(dirstream);
1557 } else if (fd >= 0) {
1564 int get_device_info(int fd, u64 devid,
1565 struct btrfs_ioctl_dev_info_args *di_args)
1569 di_args->devid = devid;
1570 memset(&di_args->uuid, '\0', sizeof(di_args->uuid));
1572 ret = ioctl(fd, BTRFS_IOC_DEV_INFO, di_args);
1573 return ret < 0 ? -errno : 0;
1576 static u64 find_max_device_id(struct btrfs_ioctl_search_args *search_args,
1579 struct btrfs_dev_item *dev_item;
1580 char *buf = search_args->buf;
1582 buf += (nr_items - 1) * (sizeof(struct btrfs_ioctl_search_header)
1583 + sizeof(struct btrfs_dev_item));
1584 buf += sizeof(struct btrfs_ioctl_search_header);
1586 dev_item = (struct btrfs_dev_item *)buf;
1588 return btrfs_stack_device_id(dev_item);
1591 static int search_chunk_tree_for_fs_info(int fd,
1592 struct btrfs_ioctl_fs_info_args *fi_args)
1596 u64 start_devid = 1;
1597 struct btrfs_ioctl_search_args search_args;
1598 struct btrfs_ioctl_search_key *search_key = &search_args.key;
1600 fi_args->num_devices = 0;
1602 max_items = BTRFS_SEARCH_ARGS_BUFSIZE
1603 / (sizeof(struct btrfs_ioctl_search_header)
1604 + sizeof(struct btrfs_dev_item));
1606 search_key->tree_id = BTRFS_CHUNK_TREE_OBJECTID;
1607 search_key->min_objectid = BTRFS_DEV_ITEMS_OBJECTID;
1608 search_key->max_objectid = BTRFS_DEV_ITEMS_OBJECTID;
1609 search_key->min_type = BTRFS_DEV_ITEM_KEY;
1610 search_key->max_type = BTRFS_DEV_ITEM_KEY;
1611 search_key->min_transid = 0;
1612 search_key->max_transid = (u64)-1;
1613 search_key->nr_items = max_items;
1614 search_key->max_offset = (u64)-1;
1617 search_key->min_offset = start_devid;
1619 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &search_args);
1623 fi_args->num_devices += (u64)search_key->nr_items;
1625 if (search_key->nr_items == max_items) {
1626 start_devid = find_max_device_id(&search_args,
1627 search_key->nr_items) + 1;
1631 /* get the lastest max_id to stay consistent with the num_devices */
1632 if (search_key->nr_items == 0)
1634 * last tree_search returns an empty buf, use the devid of
1635 * the last dev_item of the previous tree_search
1637 fi_args->max_id = start_devid - 1;
1639 fi_args->max_id = find_max_device_id(&search_args,
1640 search_key->nr_items);
1646 * For a given path, fill in the ioctl fs_ and info_ args.
1647 * If the path is a btrfs mountpoint, fill info for all devices.
1648 * If the path is a btrfs device, fill in only that device.
1650 * The path provided must be either on a mounted btrfs fs,
1651 * or be a mounted btrfs device.
1653 * Returns 0 on success, or a negative errno.
1655 int get_fs_info(const char *path, struct btrfs_ioctl_fs_info_args *fi_args,
1656 struct btrfs_ioctl_dev_info_args **di_ret)
1663 struct btrfs_fs_devices *fs_devices_mnt = NULL;
1664 struct btrfs_ioctl_dev_info_args *di_args;
1665 struct btrfs_ioctl_dev_info_args tmp;
1667 DIR *dirstream = NULL;
1669 memset(fi_args, 0, sizeof(*fi_args));
1671 if (is_block_device(path) == 1) {
1672 struct btrfs_super_block *disk_super;
1673 char buf[BTRFS_SUPER_INFO_SIZE];
1675 /* Ensure it's mounted, then set path to the mountpoint */
1676 fd = open(path, O_RDONLY);
1679 error("cannot open %s: %s", path, strerror(errno));
1682 ret = check_mounted_where(fd, path, mp, sizeof(mp),
1691 /* Only fill in this one device */
1692 fi_args->num_devices = 1;
1694 disk_super = (struct btrfs_super_block *)buf;
1695 ret = btrfs_read_dev_super(fd, disk_super,
1696 BTRFS_SUPER_INFO_OFFSET, 0);
1701 last_devid = btrfs_stack_device_id(&disk_super->dev_item);
1702 fi_args->max_id = last_devid;
1704 memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
1708 /* at this point path must not be for a block device */
1709 fd = open_file_or_dir(path, &dirstream);
1715 /* fill in fi_args if not just a single device */
1716 if (fi_args->num_devices != 1) {
1717 ret = ioctl(fd, BTRFS_IOC_FS_INFO, fi_args);
1724 * The fs_args->num_devices does not include seed devices
1726 ret = search_chunk_tree_for_fs_info(fd, fi_args);
1731 * search_chunk_tree_for_fs_info() will lacks the devid 0
1732 * so manual probe for it here.
1734 ret = get_device_info(fd, 0, &tmp);
1736 fi_args->num_devices++;
1739 if (last_devid == 0)
1744 if (!fi_args->num_devices)
1747 di_args = *di_ret = malloc((fi_args->num_devices) * sizeof(*di_args));
1754 memcpy(di_args, &tmp, sizeof(tmp));
1755 for (; last_devid <= fi_args->max_id; last_devid++) {
1756 ret = get_device_info(fd, last_devid, &di_args[ndevs]);
1765 * only when the only dev we wanted to find is not there then
1766 * let any error be returned
1768 if (fi_args->num_devices != 1) {
1774 close_file_or_dir(fd, dirstream);
1778 int get_fsid(const char *path, u8 *fsid, int silent)
1782 struct btrfs_ioctl_fs_info_args args;
1784 fd = open(path, O_RDONLY);
1788 error("failed to open %s: %s", path,
1793 ret = ioctl(fd, BTRFS_IOC_FS_INFO, &args);
1799 memcpy(fsid, args.fsid, BTRFS_FSID_SIZE);
1808 int is_seen_fsid(u8 *fsid, struct seen_fsid *seen_fsid_hash[])
1811 int slot = hash % SEEN_FSID_HASH_SIZE;
1812 struct seen_fsid *seen = seen_fsid_hash[slot];
1815 if (memcmp(seen->fsid, fsid, BTRFS_FSID_SIZE) == 0)
1824 int add_seen_fsid(u8 *fsid, struct seen_fsid *seen_fsid_hash[],
1825 int fd, DIR *dirstream)
1828 int slot = hash % SEEN_FSID_HASH_SIZE;
1829 struct seen_fsid *seen = seen_fsid_hash[slot];
1830 struct seen_fsid *alloc;
1836 if (memcmp(seen->fsid, fsid, BTRFS_FSID_SIZE) == 0)
1846 alloc = malloc(sizeof(*alloc));
1851 memcpy(alloc->fsid, fsid, BTRFS_FSID_SIZE);
1853 alloc->dirstream = dirstream;
1858 seen_fsid_hash[slot] = alloc;
1863 void free_seen_fsid(struct seen_fsid *seen_fsid_hash[])
1866 struct seen_fsid *seen;
1867 struct seen_fsid *next;
1869 for (slot = 0; slot < SEEN_FSID_HASH_SIZE; slot++) {
1870 seen = seen_fsid_hash[slot];
1873 close_file_or_dir(seen->fd, seen->dirstream);
1877 seen_fsid_hash[slot] = NULL;
1881 static int group_profile_devs_min(u64 flag)
1883 switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
1884 case 0: /* single */
1885 case BTRFS_BLOCK_GROUP_DUP:
1887 case BTRFS_BLOCK_GROUP_RAID0:
1888 case BTRFS_BLOCK_GROUP_RAID1:
1889 case BTRFS_BLOCK_GROUP_RAID5:
1891 case BTRFS_BLOCK_GROUP_RAID6:
1893 case BTRFS_BLOCK_GROUP_RAID10:
1900 int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
1901 u64 dev_cnt, int mixed, int ssd)
1904 u64 profile = metadata_profile | data_profile;
1909 allowed |= BTRFS_BLOCK_GROUP_RAID10;
1911 allowed |= BTRFS_BLOCK_GROUP_RAID6;
1913 allowed |= BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
1914 BTRFS_BLOCK_GROUP_RAID5;
1916 allowed |= BTRFS_BLOCK_GROUP_DUP;
1919 if (dev_cnt > 1 && profile & BTRFS_BLOCK_GROUP_DUP) {
1920 warning("DUP is not recommended on filesystem with multiple devices");
1922 if (metadata_profile & ~allowed) {
1924 "ERROR: unable to create FS with metadata profile %s "
1925 "(have %llu devices but %d devices are required)\n",
1926 btrfs_group_profile_str(metadata_profile), dev_cnt,
1927 group_profile_devs_min(metadata_profile));
1930 if (data_profile & ~allowed) {
1932 "ERROR: unable to create FS with data profile %s "
1933 "(have %llu devices but %d devices are required)\n",
1934 btrfs_group_profile_str(data_profile), dev_cnt,
1935 group_profile_devs_min(data_profile));
1939 if (dev_cnt == 3 && profile & BTRFS_BLOCK_GROUP_RAID6) {
1940 warning("RAID6 is not recommended on filesystem with 3 devices only");
1942 if (dev_cnt == 2 && profile & BTRFS_BLOCK_GROUP_RAID5) {
1943 warning("RAID5 is not recommended on filesystem with 2 devices only");
1945 warning_on(!mixed && (data_profile & BTRFS_BLOCK_GROUP_DUP) && ssd,
1946 "DUP may not actually lead to 2 copies on the device, see manual page");
1951 int group_profile_max_safe_loss(u64 flags)
1953 switch (flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
1954 case 0: /* single */
1955 case BTRFS_BLOCK_GROUP_DUP:
1956 case BTRFS_BLOCK_GROUP_RAID0:
1958 case BTRFS_BLOCK_GROUP_RAID1:
1959 case BTRFS_BLOCK_GROUP_RAID5:
1960 case BTRFS_BLOCK_GROUP_RAID10:
1962 case BTRFS_BLOCK_GROUP_RAID6:
1969 int btrfs_scan_devices(void)
1974 struct btrfs_fs_devices *tmp_devices;
1975 blkid_dev_iterate iter = NULL;
1976 blkid_dev dev = NULL;
1977 blkid_cache cache = NULL;
1978 char path[PATH_MAX];
1980 if (btrfs_scan_done)
1983 if (blkid_get_cache(&cache, NULL) < 0) {
1984 error("blkid cache get failed");
1987 blkid_probe_all(cache);
1988 iter = blkid_dev_iterate_begin(cache);
1989 blkid_dev_set_search(iter, "TYPE", "btrfs");
1990 while (blkid_dev_next(iter, &dev) == 0) {
1991 dev = blkid_verify(cache, dev);
1994 /* if we are here its definitely a btrfs disk*/
1995 strncpy_null(path, blkid_dev_devname(dev));
1997 fd = open(path, O_RDONLY);
1999 error("cannot open %s: %s", path, strerror(errno));
2002 ret = btrfs_scan_one_device(fd, path, &tmp_devices,
2003 &num_devices, BTRFS_SUPER_INFO_OFFSET,
2006 error("cannot scan %s: %s", path, strerror(-ret));
2013 blkid_dev_iterate_end(iter);
2014 blkid_put_cache(cache);
2016 btrfs_scan_done = 1;
2022 * This reads a line from the stdin and only returns non-zero if the
2023 * first whitespace delimited token is a case insensitive match with yes
2026 int ask_user(const char *question)
2028 char buf[30] = {0,};
2029 char *saveptr = NULL;
2032 printf("%s [y/N]: ", question);
2034 return fgets(buf, sizeof(buf) - 1, stdin) &&
2035 (answer = strtok_r(buf, " \t\n\r", &saveptr)) &&
2036 (!strcasecmp(answer, "yes") || !strcasecmp(answer, "y"));
2040 * return 0 if a btrfs mount point is found
2041 * return 1 if a mount point is found but not btrfs
2042 * return <0 if something goes wrong
2044 int find_mount_root(const char *path, char **mount_root)
2052 int longest_matchlen = 0;
2053 char *longest_match = NULL;
2055 fd = open(path, O_RDONLY | O_NOATIME);
2060 mnttab = setmntent("/proc/self/mounts", "r");
2064 while ((ent = getmntent(mnttab))) {
2065 len = strlen(ent->mnt_dir);
2066 if (strncmp(ent->mnt_dir, path, len) == 0) {
2067 /* match found and use the latest match */
2068 if (longest_matchlen <= len) {
2069 free(longest_match);
2070 longest_matchlen = len;
2071 longest_match = strdup(ent->mnt_dir);
2072 not_btrfs = strcmp(ent->mnt_type, "btrfs");
2081 free(longest_match);
2086 *mount_root = realpath(longest_match, NULL);
2090 free(longest_match);
2095 * Test if path is a directory
2097 * 0 - path exists but it is not a directory
2098 * 1 - path exists and it is a directory
2101 int test_isdir(const char *path)
2106 ret = stat(path, &st);
2110 return !!S_ISDIR(st.st_mode);
2113 void units_set_mode(unsigned *units, unsigned mode)
2115 unsigned base = *units & UNITS_MODE_MASK;
2117 *units = base | mode;
2120 void units_set_base(unsigned *units, unsigned base)
2122 unsigned mode = *units & ~UNITS_MODE_MASK;
2124 *units = base | mode;
2127 int find_next_key(struct btrfs_path *path, struct btrfs_key *key)
2131 for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
2132 if (!path->nodes[level])
2134 if (path->slots[level] + 1 >=
2135 btrfs_header_nritems(path->nodes[level]))
2138 btrfs_item_key_to_cpu(path->nodes[level], key,
2139 path->slots[level] + 1);
2141 btrfs_node_key_to_cpu(path->nodes[level], key,
2142 path->slots[level] + 1);
2148 const char* btrfs_group_type_str(u64 flag)
2150 u64 mask = BTRFS_BLOCK_GROUP_TYPE_MASK |
2151 BTRFS_SPACE_INFO_GLOBAL_RSV;
2153 switch (flag & mask) {
2154 case BTRFS_BLOCK_GROUP_DATA:
2156 case BTRFS_BLOCK_GROUP_SYSTEM:
2158 case BTRFS_BLOCK_GROUP_METADATA:
2160 case BTRFS_BLOCK_GROUP_DATA|BTRFS_BLOCK_GROUP_METADATA:
2161 return "Data+Metadata";
2162 case BTRFS_SPACE_INFO_GLOBAL_RSV:
2163 return "GlobalReserve";
2169 const char* btrfs_group_profile_str(u64 flag)
2171 switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2174 case BTRFS_BLOCK_GROUP_RAID0:
2176 case BTRFS_BLOCK_GROUP_RAID1:
2178 case BTRFS_BLOCK_GROUP_RAID5:
2180 case BTRFS_BLOCK_GROUP_RAID6:
2182 case BTRFS_BLOCK_GROUP_DUP:
2184 case BTRFS_BLOCK_GROUP_RAID10:
2191 u64 disk_size(const char *path)
2195 if (statfs(path, &sfs) < 0)
2198 return sfs.f_bsize * sfs.f_blocks;
2201 u64 get_partition_size(const char *dev)
2204 int fd = open(dev, O_RDONLY);
2208 if (ioctl(fd, BLKGETSIZE64, &result) < 0) {
2218 * Check if the BTRFS_IOC_TREE_SEARCH_V2 ioctl is supported on a given
2219 * filesystem, opened at fd
2221 int btrfs_tree_search2_ioctl_supported(int fd)
2223 struct btrfs_ioctl_search_args_v2 *args2;
2224 struct btrfs_ioctl_search_key *sk;
2225 int args2_size = 1024;
2226 char args2_buf[args2_size];
2229 args2 = (struct btrfs_ioctl_search_args_v2 *)args2_buf;
2233 * Search for the extent tree item in the root tree.
2235 sk->tree_id = BTRFS_ROOT_TREE_OBJECTID;
2236 sk->min_objectid = BTRFS_EXTENT_TREE_OBJECTID;
2237 sk->max_objectid = BTRFS_EXTENT_TREE_OBJECTID;
2238 sk->min_type = BTRFS_ROOT_ITEM_KEY;
2239 sk->max_type = BTRFS_ROOT_ITEM_KEY;
2241 sk->max_offset = (u64)-1;
2242 sk->min_transid = 0;
2243 sk->max_transid = (u64)-1;
2245 args2->buf_size = args2_size - sizeof(struct btrfs_ioctl_search_args_v2);
2246 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH_V2, args2);
2247 if (ret == -EOPNOTSUPP)
2254 int btrfs_check_nodesize(u32 nodesize, u32 sectorsize, u64 features)
2256 if (nodesize < sectorsize) {
2257 error("illegal nodesize %u (smaller than %u)",
2258 nodesize, sectorsize);
2260 } else if (nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
2261 error("illegal nodesize %u (larger than %u)",
2262 nodesize, BTRFS_MAX_METADATA_BLOCKSIZE);
2264 } else if (nodesize & (sectorsize - 1)) {
2265 error("illegal nodesize %u (not aligned to %u)",
2266 nodesize, sectorsize);
2268 } else if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS &&
2269 nodesize != sectorsize) {
2270 error("illegal nodesize %u (not equal to %u for mixed block group)",
2271 nodesize, sectorsize);
2278 * Copy a path argument from SRC to DEST and check the SRC length if it's at
2279 * most PATH_MAX and fits into DEST. DESTLEN is supposed to be exact size of
2281 * The destination buffer is zero terminated.
2282 * Return < 0 for error, 0 otherwise.
2284 int arg_copy_path(char *dest, const char *src, int destlen)
2286 size_t len = strlen(src);
2288 if (len >= PATH_MAX || len >= destlen)
2289 return -ENAMETOOLONG;
2291 __strncpy_null(dest, src, destlen);
2296 unsigned int get_unit_mode_from_arg(int *argc, char *argv[], int df_mode)
2298 unsigned int unit_mode = UNITS_DEFAULT;
2302 for (arg_i = 0; arg_i < *argc; arg_i++) {
2303 if (!strcmp(argv[arg_i], "--"))
2306 if (!strcmp(argv[arg_i], "--raw")) {
2307 unit_mode = UNITS_RAW;
2311 if (!strcmp(argv[arg_i], "--human-readable")) {
2312 unit_mode = UNITS_HUMAN_BINARY;
2317 if (!strcmp(argv[arg_i], "--iec")) {
2318 units_set_mode(&unit_mode, UNITS_BINARY);
2322 if (!strcmp(argv[arg_i], "--si")) {
2323 units_set_mode(&unit_mode, UNITS_DECIMAL);
2328 if (!strcmp(argv[arg_i], "--kbytes")) {
2329 units_set_base(&unit_mode, UNITS_KBYTES);
2333 if (!strcmp(argv[arg_i], "--mbytes")) {
2334 units_set_base(&unit_mode, UNITS_MBYTES);
2338 if (!strcmp(argv[arg_i], "--gbytes")) {
2339 units_set_base(&unit_mode, UNITS_GBYTES);
2343 if (!strcmp(argv[arg_i], "--tbytes")) {
2344 units_set_base(&unit_mode, UNITS_TBYTES);
2352 if (!strcmp(argv[arg_i], "-b")) {
2353 unit_mode = UNITS_RAW;
2357 if (!strcmp(argv[arg_i], "-h")) {
2358 unit_mode = UNITS_HUMAN_BINARY;
2362 if (!strcmp(argv[arg_i], "-H")) {
2363 unit_mode = UNITS_HUMAN_DECIMAL;
2367 if (!strcmp(argv[arg_i], "-k")) {
2368 units_set_base(&unit_mode, UNITS_KBYTES);
2372 if (!strcmp(argv[arg_i], "-m")) {
2373 units_set_base(&unit_mode, UNITS_MBYTES);
2377 if (!strcmp(argv[arg_i], "-g")) {
2378 units_set_base(&unit_mode, UNITS_GBYTES);
2382 if (!strcmp(argv[arg_i], "-t")) {
2383 units_set_base(&unit_mode, UNITS_TBYTES);
2389 for (arg_i = 0, arg_end = 0; arg_i < *argc; arg_i++) {
2392 argv[arg_end] = argv[arg_i];
2401 u64 div_factor(u64 num, int factor)
2410 * Get the length of the string converted from a u64 number.
2412 * Result is equal to log10(num) + 1, but without the use of math library.
2414 int count_digits(u64 num)
2427 int string_is_numerical(const char *str)
2431 if (!(*str >= '0' && *str <= '9'))
2433 while (*str >= '0' && *str <= '9')
2440 int prefixcmp(const char *str, const char *prefix)
2442 for (; ; str++, prefix++)
2445 else if (*str != *prefix)
2446 return (unsigned char)*prefix - (unsigned char)*str;
2449 /* Subvolume helper functions */
2451 * test if name is a correct subvolume name
2452 * this function return
2453 * 0-> name is not a correct subvolume name
2454 * 1-> name is a correct subvolume name
2456 int test_issubvolname(const char *name)
2458 return name[0] != '\0' && !strchr(name, '/') &&
2459 strcmp(name, ".") && strcmp(name, "..");
2463 * Test if path is a subvolume
2465 * 0 - path exists but it is not a subvolume
2466 * 1 - path exists and it is a subvolume
2469 int test_issubvolume(const char *path)
2475 res = stat(path, &st);
2479 if (st.st_ino != BTRFS_FIRST_FREE_OBJECTID || !S_ISDIR(st.st_mode))
2482 res = statfs(path, &stfs);
2486 return (int)stfs.f_type == BTRFS_SUPER_MAGIC;
2489 const char *subvol_strip_mountpoint(const char *mnt, const char *full_path)
2491 int len = strlen(mnt);
2495 if (mnt[len - 1] != '/')
2498 return full_path + len;
2505 * 1: Error; and error info printed to the terminal. Fixme.
2506 * 2: If the fullpath is root tree instead of subvol tree
2508 int get_subvol_info(const char *fullpath, struct root_info *get_ri)
2515 const char *svpath = NULL;
2516 DIR *dirstream1 = NULL;
2517 DIR *dirstream2 = NULL;
2519 ret = test_issubvolume(fullpath);
2523 error("not a subvolume: %s", fullpath);
2527 ret = find_mount_root(fullpath, &mnt);
2531 error("%s doesn't belong to btrfs mount point", fullpath);
2535 svpath = subvol_strip_mountpoint(mnt, fullpath);
2537 fd = btrfs_open_dir(fullpath, &dirstream1, 1);
2541 ret = btrfs_list_get_path_rootid(fd, &sv_id);
2545 mntfd = btrfs_open_dir(mnt, &dirstream2, 1);
2549 memset(get_ri, 0, sizeof(*get_ri));
2550 get_ri->root_id = sv_id;
2552 if (sv_id == BTRFS_FS_TREE_OBJECTID)
2553 ret = btrfs_get_toplevel_subvol(mntfd, get_ri);
2555 ret = btrfs_get_subvol(mntfd, get_ri);
2557 error("can't find '%s': %d", svpath, ret);
2560 close_file_or_dir(mntfd, dirstream2);
2561 close_file_or_dir(fd, dirstream1);
2567 int get_subvol_info_by_rootid(const char *mnt, struct root_info *get_ri, u64 r_id)
2571 DIR *dirstream = NULL;
2573 fd = btrfs_open_dir(mnt, &dirstream, 1);
2577 memset(get_ri, 0, sizeof(*get_ri));
2578 get_ri->root_id = r_id;
2580 if (r_id == BTRFS_FS_TREE_OBJECTID)
2581 ret = btrfs_get_toplevel_subvol(fd, get_ri);
2583 ret = btrfs_get_subvol(fd, get_ri);
2586 error("can't find rootid '%llu' on '%s': %d", r_id, mnt, ret);
2588 close_file_or_dir(fd, dirstream);
2593 int get_subvol_info_by_uuid(const char *mnt, struct root_info *get_ri, u8 *uuid_arg)
2597 DIR *dirstream = NULL;
2599 fd = btrfs_open_dir(mnt, &dirstream, 1);
2603 memset(get_ri, 0, sizeof(*get_ri));
2604 uuid_copy(get_ri->uuid, uuid_arg);
2606 ret = btrfs_get_subvol(fd, get_ri);
2608 char uuid_parsed[BTRFS_UUID_UNPARSED_SIZE];
2609 uuid_unparse(uuid_arg, uuid_parsed);
2610 error("can't find uuid '%s' on '%s': %d",
2611 uuid_parsed, mnt, ret);
2614 close_file_or_dir(fd, dirstream);
2619 /* Set the seed manually */
2620 void init_rand_seed(u64 seed)
2624 /* only use the last 48 bits */
2625 for (i = 0; i < 3; i++) {
2626 rand_seed[i] = (unsigned short)(seed ^ (unsigned short)(-1));
2629 rand_seed_initlized = 1;
2632 static void __init_seed(void)
2638 if(rand_seed_initlized)
2640 /* Use urandom as primary seed source. */
2641 fd = open("/dev/urandom", O_RDONLY);
2643 ret = read(fd, rand_seed, sizeof(rand_seed));
2645 if (ret < sizeof(rand_seed))
2649 /* Use time and pid as fallback seed */
2650 warning("failed to read /dev/urandom, use time and pid as random seed");
2651 gettimeofday(&tv, 0);
2652 rand_seed[0] = getpid() ^ (tv.tv_sec & 0xFFFF);
2653 rand_seed[1] = getppid() ^ (tv.tv_usec & 0xFFFF);
2654 rand_seed[2] = (tv.tv_sec ^ tv.tv_usec) >> 16;
2656 rand_seed_initlized = 1;
2663 * Don't use nrand48, its range is [0,2^31) The highest bit will alwasy
2664 * be 0. Use jrand48 to include the highest bit.
2666 return (u32)jrand48(rand_seed);
2669 /* Return random number in range [0, upper) */
2670 unsigned int rand_range(unsigned int upper)
2674 * Use the full 48bits to mod, which would be more uniformly
2677 return (unsigned int)(jrand48(rand_seed) % upper);
2682 return (int)(rand_u32());
2697 return (u16)(rand_u32());
2702 return (u8)(rand_u32());
2705 void btrfs_config_init(void)
2709 /* Returns total size of main memory in bytes, -1UL if error. */
2710 unsigned long total_memory(void)
2714 if (sysinfo(&si) < 0) {
2715 error("can't determine memory size");
2718 return si.totalram * si.mem_unit; /* bytes */
2721 void print_device_info(struct btrfs_device *device, char *prefix)
2724 printf("%s", prefix);
2725 printf("Device: id = %llu, name = %s\n",
2726 device->devid, device->name);
2729 void print_all_devices(struct list_head *devices)
2731 struct btrfs_device *dev;
2733 printf("All Devices:\n");
2734 list_for_each_entry(dev, devices, dev_list)
2735 print_device_info(dev, "\t");