#define BLKDISCARD _IO(0x12,119)
#endif
-static int
-discard_blocks(int fd, u64 start, u64 len)
+static char argv0_buf[ARGV0_BUF_SIZE] = "btrfs";
+
+void fixup_argv0(char **argv, const char *token)
+{
+ int len = strlen(argv0_buf);
+
+ snprintf(argv0_buf + len, sizeof(argv0_buf) - len, " %s", token);
+ argv[0] = argv0_buf;
+}
+
+void set_argv0(char **argv)
+{
+ sprintf(argv0_buf, "%s", argv[0]);
+}
+
+int check_argc_exact(int nargs, int expected)
+{
+ if (nargs < expected)
+ fprintf(stderr, "%s: too few arguments\n", argv0_buf);
+ if (nargs > expected)
+ fprintf(stderr, "%s: too many arguments\n", argv0_buf);
+
+ return nargs != expected;
+}
+
+int check_argc_min(int nargs, int expected)
+{
+ if (nargs < expected) {
+ fprintf(stderr, "%s: too few arguments\n", argv0_buf);
+ return 1;
+ }
+
+ return 0;
+}
+
+int check_argc_max(int nargs, int expected)
+{
+ if (nargs > expected) {
+ fprintf(stderr, "%s: too many arguments\n", argv0_buf);
+ return 1;
+ }
+
+ return 0;
+}
+
+
+/*
+ * Discard the given range in one go
+ */
+static int discard_range(int fd, u64 start, u64 len)
{
u64 range[2] = { start, len };
return 0;
}
+/*
+ * Discard blocks in the given range in 1G chunks, the process is interruptible
+ */
+static int discard_blocks(int fd, u64 start, u64 len)
+{
+ while (len > 0) {
+ /* 1G granularity */
+ u64 chunk_size = min_t(u64, len, 1*1024*1024*1024);
+ int ret;
+
+ ret = discard_range(fd, start, chunk_size);
+ if (ret)
+ return ret;
+ len -= chunk_size;
+ start += chunk_size;
+ }
+
+ return 0;
+}
+
static u64 reference_root_table[] = {
[1] = BTRFS_ROOT_TREE_OBJECTID,
[2] = BTRFS_EXTENT_TREE_OBJECTID,
[6] = BTRFS_CSUM_TREE_OBJECTID,
};
-int make_btrfs(int fd, const char *device, const char *label,
+int test_uuid_unique(char *fs_uuid)
+{
+ int unique = 1;
+ blkid_dev_iterate iter = NULL;
+ blkid_dev dev = NULL;
+ blkid_cache cache = NULL;
+
+ if (blkid_get_cache(&cache, 0) < 0) {
+ printf("ERROR: lblkid cache get failed\n");
+ return 1;
+ }
+ blkid_probe_all(cache);
+ iter = blkid_dev_iterate_begin(cache);
+ blkid_dev_set_search(iter, "UUID", fs_uuid);
+
+ while (blkid_dev_next(iter, &dev) == 0) {
+ dev = blkid_verify(cache, dev);
+ if (dev) {
+ unique = 0;
+ break;
+ }
+ }
+
+ blkid_dev_iterate_end(iter);
+ blkid_put_cache(cache);
+
+ return unique;
+}
+
+int make_btrfs(int fd, const char *device, const char *label, char *fs_uuid,
u64 blocks[7], u64 num_bytes, u32 nodesize,
u32 leafsize, u32 sectorsize, u32 stripesize, u64 features)
{
struct btrfs_super_block super;
- struct extent_buffer *buf;
+ struct extent_buffer *buf = NULL;
struct btrfs_root_item root_item;
struct btrfs_disk_key disk_key;
struct btrfs_extent_item *extent_item;
memset(&super, 0, sizeof(super));
num_bytes = (num_bytes / sectorsize) * sectorsize;
- uuid_generate(super.fsid);
+ if (fs_uuid) {
+ if (uuid_parse(fs_uuid, super.fsid) != 0) {
+ fprintf(stderr, "could not parse UUID: %s\n", fs_uuid);
+ ret = -EINVAL;
+ goto out;
+ }
+ if (!test_uuid_unique(fs_uuid)) {
+ fprintf(stderr, "non-unique UUID: %s\n", fs_uuid);
+ ret = -EBUSY;
+ goto out;
+ }
+ } else {
+ uuid_generate(super.fsid);
+ }
uuid_generate(super.dev_item.uuid);
uuid_generate(chunk_tree_uuid);
write_extent_buffer(buf, super.fsid, btrfs_header_fsid(),
BTRFS_FSID_SIZE);
- write_extent_buffer(buf, chunk_tree_uuid, (unsigned long)
+ write_extent_buffer(buf, chunk_tree_uuid,
btrfs_header_chunk_tree_uuid(buf),
BTRFS_UUID_SIZE);
return ret;
}
-static int zero_dev_start(int fd)
+#define ZERO_DEV_BYTES (2 * 1024 * 1024)
+
+/* don't write outside the device by clamping the region to the device size */
+static int zero_dev_clamped(int fd, off_t start, ssize_t len, u64 dev_size)
{
- off_t start = 0;
- size_t len = 2 * 1024 * 1024;
+ off_t end = max(start, start + len);
#ifdef __sparc__
- /* don't overwrite the disk labels on sparc */
- start = 1024;
- len -= 1024;
+ /* and don't overwrite the disk labels on sparc */
+ start = max(start, 1024);
+ end = max(end, 1024);
#endif
- return zero_blocks(fd, start, len);
-}
-static int zero_dev_end(int fd, u64 dev_size)
-{
- size_t len = 2 * 1024 * 1024;
- off_t start = dev_size - len;
+ start = min_t(u64, start, dev_size);
+ end = min_t(u64, end, dev_size);
- return zero_blocks(fd, start, len);
+ return zero_blocks(fd, start, end - start);
}
int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
return 0;
}
+static void btrfs_wipe_existing_sb(int fd)
+{
+ const char *off = NULL;
+ size_t len = 0;
+ loff_t offset;
+ char buf[BUFSIZ];
+ int rc = 0;
+ blkid_probe pr = NULL;
+
+ pr = blkid_new_probe();
+ if (!pr)
+ return;
+
+ if (blkid_probe_set_device(pr, fd, 0, 0))
+ goto out;
+
+ rc = blkid_probe_lookup_value(pr, "SBMAGIC_OFFSET", &off, NULL);
+ if (!rc)
+ rc = blkid_probe_lookup_value(pr, "SBMAGIC", NULL, &len);
+
+ if (rc || len == 0 || off == NULL)
+ goto out;
+
+ offset = strtoll(off, NULL, 10);
+ if (len > sizeof(buf))
+ len = sizeof(buf);
+
+ memset(buf, 0, len);
+ rc = pwrite(fd, buf, len, offset);
+ fsync(fd);
+
+out:
+ blkid_free_probe(pr);
+ return;
+}
+
int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
u64 max_block_count, int *mixed, int discard)
{
u64 block_count;
- u64 bytenr;
struct stat st;
int i, ret;
ret = fstat(fd, &st);
if (ret < 0) {
fprintf(stderr, "unable to stat %s\n", file);
- exit(1);
+ return 1;
}
block_count = btrfs_device_size(fd, &st);
if (block_count == 0) {
fprintf(stderr, "unable to find %s size\n", file);
- exit(1);
+ return 1;
}
if (max_block_count)
block_count = min(block_count, max_block_count);
- zero_end = 1;
- if (block_count < 1024 * 1024 * 1024 && !(*mixed)) {
- printf("SMALL VOLUME: forcing mixed metadata/data groups\n");
+ if (block_count < BTRFS_MKFS_SMALL_VOLUME_SIZE && !(*mixed))
*mixed = 1;
- }
if (discard) {
/*
* is not necessary for the mkfs functionality but just an
* optimization.
*/
- if (discard_blocks(fd, 0, 0) == 0) {
+ if (discard_range(fd, 0, 0) == 0) {
fprintf(stderr, "Performing full device TRIM (%s) ...\n",
pretty_size(block_count));
discard_blocks(fd, 0, block_count);
}
}
- ret = zero_dev_start(fd);
- if (ret) {
- fprintf(stderr, "failed to zero device start %d\n", ret);
- exit(1);
- }
+ ret = zero_dev_clamped(fd, 0, ZERO_DEV_BYTES, block_count);
+ for (i = 0 ; !ret && i < BTRFS_SUPER_MIRROR_MAX; i++)
+ ret = zero_dev_clamped(fd, btrfs_sb_offset(i),
+ BTRFS_SUPER_INFO_SIZE, block_count);
+ if (!ret && zero_end)
+ ret = zero_dev_clamped(fd, block_count - ZERO_DEV_BYTES,
+ ZERO_DEV_BYTES, block_count);
- for (i = 0 ; i < BTRFS_SUPER_MIRROR_MAX; i++) {
- bytenr = btrfs_sb_offset(i);
- if (bytenr >= block_count)
- break;
- zero_blocks(fd, bytenr, BTRFS_SUPER_INFO_SIZE);
+ if (ret < 0) {
+ fprintf(stderr, "ERROR: failed to zero device '%s' - %s\n",
+ file, strerror(-ret));
+ return 1;
}
- if (zero_end) {
- ret = zero_dev_end(fd, block_count);
- if (ret) {
- fprintf(stderr, "failed to zero device end %d\n", ret);
- exit(1);
- }
- }
+ btrfs_wipe_existing_sb(fd);
+
*block_count_ret = block_count;
return 0;
}
char real_a[PATH_MAX];
char real_b[PATH_MAX];
- if(!realpath(a, real_a) ||
- !realpath(b, real_b))
- {
- return -errno;
- }
+ if(!realpath(a, real_a))
+ strcpy(real_a, a);
+
+ if (!realpath(b, real_b))
+ strcpy(real_b, b);
/* Identical path? */
if(strcmp(real_a, real_b) == 0)
{
char res_a[PATH_MAX];
char res_b[PATH_MAX];
- const char* final_a;
- const char* final_b;
+ const char* final_a = NULL;
+ const char* final_b = NULL;
int ret;
/* Resolve a if it is a loop device */
return 0;
return ret;
} else if (ret) {
- if ((ret = resolve_loop_device(a, res_a, sizeof(res_a))) < 0)
- return ret;
-
- final_a = res_a;
+ ret = resolve_loop_device(a, res_a, sizeof(res_a));
+ if (ret < 0) {
+ if (errno != EPERM)
+ return ret;
+ } else {
+ final_a = res_a;
+ }
} else {
final_a = a;
}
return 0;
return ret;
} else if (ret) {
- if((ret = resolve_loop_device(b, res_b, sizeof(res_b))) < 0)
- return ret;
-
- final_b = res_b;
+ ret = resolve_loop_device(b, res_b, sizeof(res_b));
+ if (ret < 0) {
+ if (errno != EPERM)
+ return ret;
+ } else {
+ final_b = res_b;
+ }
} else {
final_b = b;
}
}
/*
+ * Resolve a pathname to a device mapper node to /dev/mapper/<name>
+ * Returns NULL on invalid input or malloc failure; Other failures
+ * will be handled by the caller using the input pathame.
+ */
+char *canonicalize_dm_name(const char *ptname)
+{
+ FILE *f;
+ size_t sz;
+ char path[PATH_MAX], name[PATH_MAX], *res = NULL;
+
+ if (!ptname || !*ptname)
+ return NULL;
+
+ snprintf(path, sizeof(path), "/sys/block/%s/dm/name", ptname);
+ if (!(f = fopen(path, "r")))
+ return NULL;
+
+ /* read <name>\n from sysfs */
+ if (fgets(name, sizeof(name), f) && (sz = strlen(name)) > 1) {
+ name[sz - 1] = '\0';
+ snprintf(path, sizeof(path), "/dev/mapper/%s", name);
+
+ if (access(path, F_OK) == 0)
+ res = strdup(path);
+ }
+ fclose(f);
+ return res;
+}
+
+/*
+ * Resolve a pathname to a canonical device node, e.g. /dev/sda1 or
+ * to a device mapper pathname.
+ * Returns NULL on invalid input or malloc failure; Other failures
+ * will be handled by the caller using the input pathame.
+ */
+char *canonicalize_path(const char *path)
+{
+ char *canonical, *p;
+
+ if (!path || !*path)
+ return NULL;
+
+ canonical = realpath(path, NULL);
+ if (!canonical)
+ return strdup(path);
+ p = strrchr(canonical, '/');
+ if (p && strncmp(p, "/dm-", 4) == 0 && isdigit(*(p + 4))) {
+ char *dm = canonicalize_dm_name(p + 1);
+
+ if (dm) {
+ free(canonical);
+ return dm;
+ }
+ }
+ return canonical;
+}
+
+/*
* returns 1 if the device was mounted, < 0 on error or 0 if everything
* is safe to continue.
*/
/* scan the initial device */
ret = btrfs_scan_one_device(fd, file, &fs_devices_mnt,
- &total_devs, BTRFS_SUPER_INFO_OFFSET);
+ &total_devs, BTRFS_SUPER_INFO_OFFSET, 0);
is_btrfs = (ret >= 0);
/* scan other devices */
if (is_btrfs && total_devs > 1) {
- if ((ret = btrfs_scan_for_fsid(!BTRFS_UPDATE_KERNEL)))
+ ret = btrfs_scan_lblkid(!BTRFS_UPDATE_KERNEL);
+ if (ret)
return ret;
}
/* iterate over the list of currently mountes filesystems */
- if ((f = setmntent ("/proc/mounts", "r")) == NULL)
+ if ((f = setmntent ("/proc/self/mounts", "r")) == NULL)
return -errno;
while ((mnt = getmntent (f)) != NULL) {
close(fd);
}
-int btrfs_scan_one_dir(char *dirname, int run_ioctl)
-{
- DIR *dirp = NULL;
- struct dirent *dirent;
- struct pending_dir *pending;
- struct stat st;
- int ret;
- int fd;
- int dirname_len;
- char *fullpath;
- struct list_head pending_list;
- struct btrfs_fs_devices *tmp_devices;
- u64 num_devices;
-
- INIT_LIST_HEAD(&pending_list);
-
- pending = malloc(sizeof(*pending));
- if (!pending)
- return -ENOMEM;
- strcpy(pending->name, dirname);
-
-again:
- dirname_len = strlen(pending->name);
- fullpath = malloc(PATH_MAX);
- dirname = pending->name;
-
- if (!fullpath) {
- ret = -ENOMEM;
- goto fail;
- }
- dirp = opendir(dirname);
- if (!dirp) {
- fprintf(stderr, "Unable to open %s for scanning\n", dirname);
- ret = -ENOENT;
- goto fail;
- }
- while(1) {
- dirent = readdir(dirp);
- if (!dirent)
- break;
- if (dirent->d_name[0] == '.')
- continue;
- if (dirname_len + strlen(dirent->d_name) + 2 > PATH_MAX) {
- ret = -EFAULT;
- goto fail;
- }
- snprintf(fullpath, PATH_MAX, "%s/%s", dirname, dirent->d_name);
- ret = lstat(fullpath, &st);
- if (ret < 0) {
- fprintf(stderr, "failed to stat %s\n", fullpath);
- continue;
- }
- if (S_ISLNK(st.st_mode))
- continue;
- if (S_ISDIR(st.st_mode)) {
- struct pending_dir *next = malloc(sizeof(*next));
- if (!next) {
- ret = -ENOMEM;
- goto fail;
- }
- strcpy(next->name, fullpath);
- list_add_tail(&next->list, &pending_list);
- }
- if (!S_ISBLK(st.st_mode)) {
- continue;
- }
- fd = open(fullpath, O_RDONLY);
- if (fd < 0) {
- /* ignore the following errors:
- ENXIO (device don't exists)
- ENOMEDIUM (No medium found ->
- like a cd tray empty)
- */
- if(errno != ENXIO && errno != ENOMEDIUM)
- fprintf(stderr, "failed to read %s: %s\n",
- fullpath, strerror(errno));
- continue;
- }
- ret = btrfs_scan_one_device(fd, fullpath, &tmp_devices,
- &num_devices,
- BTRFS_SUPER_INFO_OFFSET);
- if (ret == 0 && run_ioctl > 0) {
- btrfs_register_one_device(fullpath);
- }
- close(fd);
- }
- if (!list_empty(&pending_list)) {
- free(pending);
- pending = list_entry(pending_list.next, struct pending_dir,
- list);
- free(fullpath);
- list_del(&pending->list);
- closedir(dirp);
- dirp = NULL;
- goto again;
- }
- ret = 0;
-fail:
- free(pending);
- free(fullpath);
- while (!list_empty(&pending_list)) {
- pending = list_entry(pending_list.next, struct pending_dir,
- list);
- list_del(&pending->list);
- free(pending);
- }
- if (dirp)
- closedir(dirp);
- return ret;
-}
-
-int btrfs_scan_for_fsid(int run_ioctls)
-{
- int ret;
-
- ret = scan_for_btrfs(BTRFS_SCAN_PROC, run_ioctls);
- if (ret)
- ret = scan_for_btrfs(BTRFS_SCAN_DEV, run_ioctls);
- return ret;
-}
-
int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
int super_offset)
{
fd = open(mount_path, O_RDONLY | O_NOATIME);
if (fd < 0) {
- fprintf(stderr, "ERROR: unable access to '%s'\n", mount_path);
+ fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
return -1;
}
return 0;
}
-static int get_label_unmounted(const char *dev)
+static int get_label_unmounted(const char *dev, char *label)
{
struct btrfs_root *root;
int ret;
if(!root)
return -1;
- fprintf(stdout, "%s\n", root->fs_info->super_copy->label);
+ memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
/* Now we close it since we are done. */
close_ctree(root);
fd = open(mount_path, O_RDONLY | O_NOATIME);
if (fd < 0) {
- fprintf(stderr, "ERROR: unable access to '%s'\n", mount_path);
+ fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
return -1;
}
return 0;
}
-int get_label(const char *btrfs_dev)
+int get_label(const char *btrfs_dev, char *label)
{
int ret;
- char label[BTRFS_LABEL_SIZE];
- if (is_existing_blk_or_reg_file(btrfs_dev))
- ret = get_label_unmounted(btrfs_dev);
- else {
+ ret = is_existing_blk_or_reg_file(btrfs_dev);
+ if (!ret)
ret = get_label_mounted(btrfs_dev, label);
- if (!ret)
- fprintf(stdout, "%s\n", label);
- }
+ else if (ret > 0)
+ ret = get_label_unmounted(btrfs_dev, label);
+
return ret;
}
int set_label(const char *btrfs_dev, const char *label)
{
+ int ret;
+
if (check_label(label))
return -1;
- return is_existing_blk_or_reg_file(btrfs_dev) ?
- set_label_unmounted(btrfs_dev, label) :
- set_label_mounted(btrfs_dev, label);
+ ret = is_existing_blk_or_reg_file(btrfs_dev);
+ if (!ret)
+ ret = set_label_mounted(btrfs_dev, label);
+ else if (ret > 0)
+ ret = set_label_unmounted(btrfs_dev, label);
+
+ return ret;
}
int btrfs_scan_block_devices(int run_ioctl)
}
ret = btrfs_scan_one_device(fd, fullpath, &tmp_devices,
&num_devices,
- BTRFS_SUPER_INFO_OFFSET);
+ BTRFS_SUPER_INFO_OFFSET, 0);
if (ret == 0 && run_ioctl > 0) {
btrfs_register_one_device(fullpath);
}
return 0;
}
-u64 parse_size(char *s)
+/*
+ * A not-so-good version fls64. No fascinating optimization since
+ * no one except parse_size use it
+ */
+static int fls64(u64 x)
{
int i;
+
+ for (i = 0; i <64; i++)
+ if (x << i & (1ULL << 63))
+ return 64 - i;
+ return 64 - i;
+}
+
+u64 parse_size(char *s)
+{
char c;
+ char *endptr;
u64 mult = 1;
+ u64 ret;
- for (i = 0; s && s[i] && isdigit(s[i]); i++) ;
- if (!i) {
- fprintf(stderr, "ERROR: size value is empty\n");
- exit(50);
+ if (!s) {
+ fprintf(stderr, "ERROR: Size value is empty\n");
+ exit(1);
}
-
- if (s[i]) {
- c = tolower(s[i]);
+ if (s[0] == '-') {
+ fprintf(stderr,
+ "ERROR: Size value '%s' is less equal than 0\n", s);
+ exit(1);
+ }
+ ret = strtoull(s, &endptr, 10);
+ if (endptr == s) {
+ fprintf(stderr, "ERROR: Size value '%s' is invalid\n", s);
+ exit(1);
+ }
+ if (endptr[0] && endptr[1]) {
+ fprintf(stderr, "ERROR: Illegal suffix contains character '%c' in wrong position\n",
+ endptr[1]);
+ exit(1);
+ }
+ /*
+ * strtoll returns LLONG_MAX when overflow, if this happens,
+ * need to call strtoull to get the real size
+ */
+ if (errno == ERANGE && ret == ULLONG_MAX) {
+ fprintf(stderr,
+ "ERROR: Size value '%s' is too large for u64\n", s);
+ exit(1);
+ }
+ if (endptr[0]) {
+ c = tolower(endptr[0]);
switch (c) {
case 'e':
mult *= 1024;
+ /* fallthrough */
case 'p':
mult *= 1024;
+ /* fallthrough */
case 't':
mult *= 1024;
+ /* fallthrough */
case 'g':
mult *= 1024;
+ /* fallthrough */
case 'm':
mult *= 1024;
+ /* fallthrough */
case 'k':
mult *= 1024;
+ /* fallthrough */
case 'b':
break;
default:
- fprintf(stderr, "ERROR: Unknown size descriptor "
- "'%c'\n", c);
+ fprintf(stderr, "ERROR: Unknown size descriptor '%c'\n",
+ c);
exit(1);
}
}
- if (s[i] && s[i+1]) {
- fprintf(stderr, "ERROR: Illegal suffix contains "
- "character '%c' in wrong position\n",
- s[i+1]);
- exit(51);
+ /* Check whether ret * mult overflow */
+ if (fls64(ret) + fls64(mult) - 1 > 64) {
+ fprintf(stderr,
+ "ERROR: Size value '%s' is too large for u64\n", s);
+ exit(1);
}
- return strtoull(s, NULL, 10) * mult;
+ ret *= mult;
+ return ret;
}
-int open_file_or_dir(const char *fname, DIR **dirstream)
+int open_file_or_dir3(const char *fname, DIR **dirstream, int open_flags)
{
int ret;
struct stat st;
if (S_ISDIR(st.st_mode)) {
*dirstream = opendir(fname);
if (!*dirstream)
- return -2;
+ return -1;
fd = dirfd(*dirstream);
+ } else if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
+ fd = open(fname, open_flags);
} else {
- fd = open(fname, O_RDWR);
+ /*
+ * we set this on purpose, in case the caller output
+ * strerror(errno) as success
+ */
+ errno = EINVAL;
+ return -1;
}
if (fd < 0) {
- fd = -3;
+ fd = -1;
if (*dirstream)
closedir(*dirstream);
}
return fd;
}
+int open_file_or_dir(const char *fname, DIR **dirstream)
+{
+ return open_file_or_dir3(fname, dirstream, O_RDWR);
+}
+
void close_file_or_dir(int fd, DIR *dirstream)
{
if (dirstream)
close(fd);
}
-static int get_device_info(int fd, u64 devid,
+int get_device_info(int fd, u64 devid,
struct btrfs_ioctl_dev_info_args *di_args)
{
int ret;
int fd = -1;
int ret = 0;
int ndevs = 0;
- int i = 1;
+ int i = 0;
struct btrfs_fs_devices *fs_devices_mnt = NULL;
struct btrfs_ioctl_dev_info_args *di_args;
char mp[BTRFS_PATH_NAME_MAX + 1];
memset(fi_args, 0, sizeof(*fi_args));
if (is_block_device(path)) {
+ struct btrfs_super_block *disk_super;
+ char buf[BTRFS_SUPER_INFO_SIZE];
+ u64 devid;
+
/* Ensure it's mounted, then set path to the mountpoint */
fd = open(path, O_RDONLY);
if (fd < 0) {
path = mp;
/* Only fill in this one device */
fi_args->num_devices = 1;
- fi_args->max_id = fs_devices_mnt->latest_devid;
- i = fs_devices_mnt->latest_devid;
+
+ disk_super = (struct btrfs_super_block *)buf;
+ ret = btrfs_read_dev_super(fd, disk_super,
+ BTRFS_SUPER_INFO_OFFSET, 0);
+ if (ret < 0) {
+ ret = -EIO;
+ goto out;
+ }
+ devid = btrfs_stack_device_id(&disk_super->dev_item);
+
+ fi_args->max_id = devid;
+ i = devid;
+
memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
close(fd);
}
ndevs++;
}
- BUG_ON(ndevs == 0);
- ret = 0;
+ /*
+ * only when the only dev we wanted to find is not there then
+ * let any error be returned
+ */
+ if (fi_args->num_devices != 1) {
+ BUG_ON(ndevs == 0);
+ ret = 0;
+ }
+
out:
close_file_or_dir(fd, dirstream);
return ret;
return 0;
}
-int test_skip_this_disk(char *path)
-{
- int fd;
-
- /*
- * this will eliminate disks which are mounted (btrfs)
- * and non-dm disk path when dm is enabled
- */
- fd = open(path, O_RDWR|O_EXCL);
- if (fd < 0)
- return 1;
- close(fd);
- return 0;
-}
-
int btrfs_scan_lblkid(int update_kernel)
{
int fd = -1;
+ int ret;
u64 num_devices;
struct btrfs_fs_devices *tmp_devices;
blkid_dev_iterate iter = NULL;
continue;
/* if we are here its definitely a btrfs disk*/
strncpy(path, blkid_dev_devname(dev), PATH_MAX);
- if (test_skip_this_disk(path))
- continue;
fd = open(path, O_RDONLY);
if (fd < 0) {
printf("ERROR: could not open %s\n", path);
continue;
}
- btrfs_scan_one_device(fd, path, &tmp_devices,
- &num_devices, BTRFS_SUPER_INFO_OFFSET);
+ ret = btrfs_scan_one_device(fd, path, &tmp_devices,
+ &num_devices, BTRFS_SUPER_INFO_OFFSET, 0);
+ if (ret) {
+ printf("ERROR: could not scan %s\n", path);
+ close (fd);
+ continue;
+ }
+
close(fd);
if (update_kernel)
btrfs_register_one_device(path);
}
blkid_dev_iterate_end(iter);
+ blkid_put_cache(cache);
return 0;
}
-/*
- * scans devs for the btrfs
-*/
-int scan_for_btrfs(int where, int update_kernel)
-{
- int ret = 0;
-
- switch (where) {
- case BTRFS_SCAN_PROC:
- ret = btrfs_scan_block_devices(update_kernel);
- break;
- case BTRFS_SCAN_DEV:
- ret = btrfs_scan_one_dir("/dev", update_kernel);
- break;
- case BTRFS_SCAN_LBLKID:
- ret = btrfs_scan_lblkid(update_kernel);
- break;
- }
- return ret;
-}
-
int is_vol_small(char *file)
{
int fd = -1;
close(fd);
return -1;
}
- if (size < 1024 * 1024 * 1024) {
+ if (size < BTRFS_MKFS_SMALL_VOLUME_SIZE) {
close(fd);
return 1;
} else {
/*
* For a given:
* - file or directory return the containing tree root id
- * - subvolume return it's own tree id
+ * - subvolume return its own tree id
* - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
* undefined and function returns -1
*/
return 0;
}
+
+/*
+ * return 0 if a btrfs mount point is found
+ * return 1 if a mount point is found but not btrfs
+ * return <0 if something goes wrong
+ */
+int find_mount_root(const char *path, char **mount_root)
+{
+ FILE *mnttab;
+ int fd;
+ struct mntent *ent;
+ int len;
+ int ret;
+ int not_btrfs = 1;
+ int longest_matchlen = 0;
+ char *longest_match = NULL;
+
+ fd = open(path, O_RDONLY | O_NOATIME);
+ if (fd < 0)
+ return -errno;
+ close(fd);
+
+ mnttab = setmntent("/proc/self/mounts", "r");
+ if (!mnttab)
+ return -errno;
+
+ while ((ent = getmntent(mnttab))) {
+ len = strlen(ent->mnt_dir);
+ if (strncmp(ent->mnt_dir, path, len) == 0) {
+ /* match found and use the latest match */
+ if (longest_matchlen <= len) {
+ free(longest_match);
+ longest_matchlen = len;
+ longest_match = strdup(ent->mnt_dir);
+ not_btrfs = strcmp(ent->mnt_type, "btrfs");
+ }
+ }
+ }
+ endmntent(mnttab);
+
+ if (!longest_match)
+ return -ENOENT;
+ if (not_btrfs) {
+ free(longest_match);
+ return 1;
+ }
+
+ ret = 0;
+ *mount_root = realpath(longest_match, NULL);
+ if (!*mount_root)
+ ret = -errno;
+
+ free(longest_match);
+ return ret;
+}
+
+int test_minimum_size(const char *file, u32 leafsize)
+{
+ int fd;
+ struct stat statbuf;
+
+ fd = open(file, O_RDONLY);
+ if (fd < 0)
+ return -errno;
+ if (stat(file, &statbuf) < 0) {
+ close(fd);
+ return -errno;
+ }
+ if (btrfs_device_size(fd, &statbuf) < btrfs_min_dev_size(leafsize)) {
+ close(fd);
+ return 1;
+ }
+ close(fd);
+ return 0;
+}
+
+/*
+ * test if name is a correct subvolume name
+ * this function return
+ * 0-> name is not a correct subvolume name
+ * 1-> name is a correct subvolume name
+ */
+int test_issubvolname(const char *name)
+{
+ return name[0] != '\0' && !strchr(name, '/') &&
+ strcmp(name, ".") && strcmp(name, "..");
+}
+
+/*
+ * test if path is a directory
+ * this function return
+ * 0-> path exists but it is not a directory
+ * 1-> path exists and it is a directory
+ * -1 -> path is unaccessible
+ */
+int test_isdir(const char *path)
+{
+ struct stat st;
+ int ret;
+
+ ret = stat(path, &st);
+ if(ret < 0 )
+ return -1;
+
+ return S_ISDIR(st.st_mode);
+}
projects / platform / upstream / btrfs-progs.git / blobdiff