#include <limits.h>
#include <blkid/blkid.h>
#include <sys/vfs.h>
+#include <sys/statfs.h>
+#include <linux/magic.h>
+#include <getopt.h>
#include "kerncompat.h"
#include "radix-tree.h"
#include "utils.h"
#include "volumes.h"
#include "ioctl.h"
+#include "commands.h"
#ifndef BLKDISCARD
#define BLKDISCARD _IO(0x12,119)
blkid_dev dev = NULL;
blkid_cache cache = NULL;
- if (blkid_get_cache(&cache, 0) < 0) {
+ if (blkid_get_cache(&cache, NULL) < 0) {
printf("ERROR: lblkid cache get failed\n");
return 1;
}
/*
* @fs_uuid - if NULL, generates a UUID, returns back the new filesystem UUID
*/
-int make_btrfs(int fd, const char *device, const char *label, char *fs_uuid,
- u64 blocks[7], u64 num_bytes, u32 nodesize,
- u32 sectorsize, u32 stripesize, u64 features)
+int make_btrfs(int fd, struct btrfs_mkfs_config *cfg)
{
struct btrfs_super_block super;
- struct extent_buffer *buf = NULL;
+ struct extent_buffer *buf;
struct btrfs_root_item root_item;
struct btrfs_disk_key disk_key;
struct btrfs_extent_item *extent_item;
u64 ref_root;
u32 array_size;
u32 item_size;
- int skinny_metadata = !!(features &
+ int skinny_metadata = !!(cfg->features &
BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA);
+ u64 num_bytes;
- first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
- first_free &= ~((u64)sectorsize - 1);
+ buf = malloc(sizeof(*buf) + max(cfg->sectorsize, cfg->nodesize));
+ if (!buf)
+ return -ENOMEM;
+
+ first_free = BTRFS_SUPER_INFO_OFFSET + cfg->sectorsize * 2 - 1;
+ first_free &= ~((u64)cfg->sectorsize - 1);
memset(&super, 0, sizeof(super));
- num_bytes = (num_bytes / sectorsize) * sectorsize;
- if (fs_uuid && *fs_uuid) {
- if (uuid_parse(fs_uuid, super.fsid) != 0) {
- fprintf(stderr, "could not parse UUID: %s\n", fs_uuid);
+ num_bytes = (cfg->num_bytes / cfg->sectorsize) * cfg->sectorsize;
+ if (cfg->fs_uuid && *cfg->fs_uuid) {
+ if (uuid_parse(cfg->fs_uuid, super.fsid) != 0) {
+ fprintf(stderr, "could not parse UUID: %s\n",
+ cfg->fs_uuid);
ret = -EINVAL;
goto out;
}
- if (!test_uuid_unique(fs_uuid)) {
- fprintf(stderr, "non-unique UUID: %s\n", fs_uuid);
+ if (!test_uuid_unique(cfg->fs_uuid)) {
+ fprintf(stderr, "non-unique UUID: %s\n", cfg->fs_uuid);
ret = -EBUSY;
goto out;
}
} else {
uuid_generate(super.fsid);
- if (fs_uuid)
- uuid_unparse(super.fsid, fs_uuid);
+ if (cfg->fs_uuid)
+ uuid_unparse(super.fsid, cfg->fs_uuid);
}
uuid_generate(super.dev_item.uuid);
uuid_generate(chunk_tree_uuid);
- btrfs_set_super_bytenr(&super, blocks[0]);
+ btrfs_set_super_bytenr(&super, cfg->blocks[0]);
btrfs_set_super_num_devices(&super, 1);
btrfs_set_super_magic(&super, BTRFS_MAGIC);
btrfs_set_super_generation(&super, 1);
- btrfs_set_super_root(&super, blocks[1]);
- btrfs_set_super_chunk_root(&super, blocks[3]);
+ btrfs_set_super_root(&super, cfg->blocks[1]);
+ btrfs_set_super_chunk_root(&super, cfg->blocks[3]);
btrfs_set_super_total_bytes(&super, num_bytes);
- btrfs_set_super_bytes_used(&super, 6 * nodesize);
- btrfs_set_super_sectorsize(&super, sectorsize);
- btrfs_set_super_leafsize(&super, nodesize);
- btrfs_set_super_nodesize(&super, nodesize);
- btrfs_set_super_stripesize(&super, stripesize);
+ btrfs_set_super_bytes_used(&super, 6 * cfg->nodesize);
+ btrfs_set_super_sectorsize(&super, cfg->sectorsize);
+ btrfs_set_super_leafsize(&super, cfg->nodesize);
+ btrfs_set_super_nodesize(&super, cfg->nodesize);
+ btrfs_set_super_stripesize(&super, cfg->stripesize);
btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
btrfs_set_super_chunk_root_generation(&super, 1);
btrfs_set_super_cache_generation(&super, -1);
- btrfs_set_super_incompat_flags(&super, features);
- if (label)
- strncpy(super.label, label, BTRFS_LABEL_SIZE - 1);
-
- buf = malloc(sizeof(*buf) + max(sectorsize, nodesize));
+ btrfs_set_super_incompat_flags(&super, cfg->features);
+ if (cfg->label)
+ strncpy(super.label, cfg->label, BTRFS_LABEL_SIZE - 1);
/* create the tree of root objects */
- memset(buf->data, 0, nodesize);
- buf->len = nodesize;
- btrfs_set_header_bytenr(buf, blocks[1]);
+ memset(buf->data, 0, cfg->nodesize);
+ buf->len = cfg->nodesize;
+ btrfs_set_header_bytenr(buf, cfg->blocks[1]);
btrfs_set_header_nritems(buf, 4);
btrfs_set_header_generation(buf, 1);
btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV);
btrfs_set_stack_inode_generation(inode_item, 1);
btrfs_set_stack_inode_size(inode_item, 3);
btrfs_set_stack_inode_nlink(inode_item, 1);
- btrfs_set_stack_inode_nbytes(inode_item, nodesize);
+ btrfs_set_stack_inode_nbytes(inode_item, cfg->nodesize);
btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
btrfs_set_root_refs(&root_item, 1);
- btrfs_set_root_used(&root_item, nodesize);
+ btrfs_set_root_used(&root_item, cfg->nodesize);
btrfs_set_root_generation(&root_item, 1);
memset(&disk_key, 0, sizeof(disk_key));
btrfs_set_disk_key_offset(&disk_key, 0);
nritems = 0;
- itemoff = __BTRFS_LEAF_DATA_SIZE(nodesize) - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, blocks[2]);
+ itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - sizeof(root_item);
+ btrfs_set_root_bytenr(&root_item, cfg->blocks[2]);
btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
btrfs_set_item_key(buf, &disk_key, nritems);
btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
nritems++;
itemoff = itemoff - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, blocks[4]);
+ btrfs_set_root_bytenr(&root_item, cfg->blocks[4]);
btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID);
btrfs_set_item_key(buf, &disk_key, nritems);
btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
nritems++;
itemoff = itemoff - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, blocks[5]);
+ btrfs_set_root_bytenr(&root_item, cfg->blocks[5]);
btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
btrfs_set_item_key(buf, &disk_key, nritems);
btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
nritems++;
itemoff = itemoff - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, blocks[6]);
+ btrfs_set_root_bytenr(&root_item, cfg->blocks[6]);
btrfs_set_disk_key_objectid(&disk_key, BTRFS_CSUM_TREE_OBJECTID);
btrfs_set_item_key(buf, &disk_key, nritems);
btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, nodesize, blocks[1]);
- if (ret != nodesize) {
+ ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[1]);
+ if (ret != cfg->nodesize) {
ret = (ret < 0 ? -errno : -EIO);
goto out;
}
/* create the items for the extent tree */
memset(buf->data + sizeof(struct btrfs_header), 0,
- nodesize - sizeof(struct btrfs_header));
+ cfg->nodesize - sizeof(struct btrfs_header));
nritems = 0;
- itemoff = __BTRFS_LEAF_DATA_SIZE(nodesize);
+ itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize);
for (i = 1; i < 7; i++) {
item_size = sizeof(struct btrfs_extent_item);
if (!skinny_metadata)
item_size += sizeof(struct btrfs_tree_block_info);
- BUG_ON(blocks[i] < first_free);
- BUG_ON(blocks[i] < blocks[i - 1]);
+ BUG_ON(cfg->blocks[i] < first_free);
+ BUG_ON(cfg->blocks[i] < cfg->blocks[i - 1]);
/* create extent item */
itemoff -= item_size;
- btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
+ btrfs_set_disk_key_objectid(&disk_key, cfg->blocks[i]);
if (skinny_metadata) {
btrfs_set_disk_key_type(&disk_key,
BTRFS_METADATA_ITEM_KEY);
} else {
btrfs_set_disk_key_type(&disk_key,
BTRFS_EXTENT_ITEM_KEY);
- btrfs_set_disk_key_offset(&disk_key, nodesize);
+ btrfs_set_disk_key_offset(&disk_key, cfg->nodesize);
}
btrfs_set_item_key(buf, &disk_key, nritems);
btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
/* create extent ref */
ref_root = reference_root_table[i];
- btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
+ btrfs_set_disk_key_objectid(&disk_key, cfg->blocks[i]);
btrfs_set_disk_key_offset(&disk_key, ref_root);
btrfs_set_disk_key_type(&disk_key, BTRFS_TREE_BLOCK_REF_KEY);
btrfs_set_item_key(buf, &disk_key, nritems);
btrfs_set_item_size(buf, btrfs_item_nr(nritems), 0);
nritems++;
}
- btrfs_set_header_bytenr(buf, blocks[2]);
+ btrfs_set_header_bytenr(buf, cfg->blocks[2]);
btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
btrfs_set_header_nritems(buf, nritems);
csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, nodesize, blocks[2]);
- if (ret != nodesize) {
+ ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[2]);
+ if (ret != cfg->nodesize) {
ret = (ret < 0 ? -errno : -EIO);
goto out;
}
/* create the chunk tree */
memset(buf->data + sizeof(struct btrfs_header), 0,
- nodesize - sizeof(struct btrfs_header));
+ cfg->nodesize - sizeof(struct btrfs_header));
nritems = 0;
item_size = sizeof(*dev_item);
- itemoff = __BTRFS_LEAF_DATA_SIZE(nodesize) - item_size;
+ itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - item_size;
/* first device 1 (there is no device 0) */
btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
btrfs_set_device_total_bytes(buf, dev_item, num_bytes);
btrfs_set_device_bytes_used(buf, dev_item,
BTRFS_MKFS_SYSTEM_GROUP_SIZE);
- btrfs_set_device_io_align(buf, dev_item, sectorsize);
- btrfs_set_device_io_width(buf, dev_item, sectorsize);
- btrfs_set_device_sector_size(buf, dev_item, sectorsize);
+ btrfs_set_device_io_align(buf, dev_item, cfg->sectorsize);
+ btrfs_set_device_io_width(buf, dev_item, cfg->sectorsize);
+ btrfs_set_device_sector_size(buf, dev_item, cfg->sectorsize);
btrfs_set_device_type(buf, dev_item, 0);
write_extent_buffer(buf, super.dev_item.uuid,
btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
btrfs_set_chunk_stripe_len(buf, chunk, 64 * 1024);
btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM);
- btrfs_set_chunk_io_align(buf, chunk, sectorsize);
- btrfs_set_chunk_io_width(buf, chunk, sectorsize);
- btrfs_set_chunk_sector_size(buf, chunk, sectorsize);
+ btrfs_set_chunk_io_align(buf, chunk, cfg->sectorsize);
+ btrfs_set_chunk_io_width(buf, chunk, cfg->sectorsize);
+ btrfs_set_chunk_sector_size(buf, chunk, cfg->sectorsize);
btrfs_set_chunk_num_stripes(buf, chunk, 1);
btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
btrfs_set_stripe_offset_nr(buf, chunk, 0, 0);
ptr += item_size;
btrfs_set_super_sys_array_size(&super, array_size);
- btrfs_set_header_bytenr(buf, blocks[3]);
+ btrfs_set_header_bytenr(buf, cfg->blocks[3]);
btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
btrfs_set_header_nritems(buf, nritems);
csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, nodesize, blocks[3]);
- if (ret != nodesize) {
+ ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[3]);
+ if (ret != cfg->nodesize) {
ret = (ret < 0 ? -errno : -EIO);
goto out;
}
/* create the device tree */
memset(buf->data + sizeof(struct btrfs_header), 0,
- nodesize - sizeof(struct btrfs_header));
+ cfg->nodesize - sizeof(struct btrfs_header));
nritems = 0;
- itemoff = __BTRFS_LEAF_DATA_SIZE(nodesize) -
+ itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) -
sizeof(struct btrfs_dev_extent);
btrfs_set_disk_key_objectid(&disk_key, 1);
BTRFS_MKFS_SYSTEM_GROUP_SIZE);
nritems++;
- btrfs_set_header_bytenr(buf, blocks[4]);
+ btrfs_set_header_bytenr(buf, cfg->blocks[4]);
btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
btrfs_set_header_nritems(buf, nritems);
csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, nodesize, blocks[4]);
- if (ret != nodesize) {
+ ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[4]);
+ if (ret != cfg->nodesize) {
ret = (ret < 0 ? -errno : -EIO);
goto out;
}
/* create the FS root */
memset(buf->data + sizeof(struct btrfs_header), 0,
- nodesize - sizeof(struct btrfs_header));
- btrfs_set_header_bytenr(buf, blocks[5]);
+ cfg->nodesize - sizeof(struct btrfs_header));
+ btrfs_set_header_bytenr(buf, cfg->blocks[5]);
btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
btrfs_set_header_nritems(buf, 0);
csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, nodesize, blocks[5]);
- if (ret != nodesize) {
+ ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[5]);
+ if (ret != cfg->nodesize) {
ret = (ret < 0 ? -errno : -EIO);
goto out;
}
/* finally create the csum root */
memset(buf->data + sizeof(struct btrfs_header), 0,
- nodesize - sizeof(struct btrfs_header));
- btrfs_set_header_bytenr(buf, blocks[6]);
+ cfg->nodesize - sizeof(struct btrfs_header));
+ btrfs_set_header_bytenr(buf, cfg->blocks[6]);
btrfs_set_header_owner(buf, BTRFS_CSUM_TREE_OBJECTID);
btrfs_set_header_nritems(buf, 0);
csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, nodesize, blocks[6]);
- if (ret != nodesize) {
+ ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[6]);
+ if (ret != cfg->nodesize) {
ret = (ret < 0 ? -errno : -EIO);
goto out;
}
/* and write out the super block */
- BUG_ON(sizeof(super) > sectorsize);
- memset(buf->data, 0, sectorsize);
+ BUG_ON(sizeof(super) > cfg->sectorsize);
+ memset(buf->data, 0, BTRFS_SUPER_INFO_SIZE);
memcpy(buf->data, &super, sizeof(super));
- buf->len = sectorsize;
+ buf->len = BTRFS_SUPER_INFO_SIZE;
csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, sectorsize, blocks[0]);
- if (ret != sectorsize) {
+ ret = pwrite(fd, buf->data, BTRFS_SUPER_INFO_SIZE, cfg->blocks[0]);
+ if (ret != BTRFS_SUPER_INFO_SIZE) {
ret = (ret < 0 ? -errno : -EIO);
goto out;
}
int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
struct btrfs_root *root, int fd, char *path,
- u64 block_count, u32 io_width, u32 io_align,
+ u64 device_total_bytes, u32 io_width, u32 io_align,
u32 sectorsize)
{
struct btrfs_super_block *disk_super;
struct btrfs_super_block *super = root->fs_info->super_copy;
struct btrfs_device *device;
struct btrfs_dev_item *dev_item;
- char *buf;
- u64 total_bytes;
+ char *buf = NULL;
+ u64 fs_total_bytes;
u64 num_devs;
int ret;
+ device_total_bytes = (device_total_bytes / sectorsize) * sectorsize;
+
device = kzalloc(sizeof(*device), GFP_NOFS);
if (!device)
- return -ENOMEM;
- buf = kmalloc(sectorsize, GFP_NOFS);
- if (!buf) {
- kfree(device);
- return -ENOMEM;
- }
+ goto err_nomem;
+ buf = kzalloc(sectorsize, GFP_NOFS);
+ if (!buf)
+ goto err_nomem;
BUG_ON(sizeof(*disk_super) > sectorsize);
- memset(buf, 0, sectorsize);
disk_super = (struct btrfs_super_block *)buf;
dev_item = &disk_super->dev_item;
device->sector_size = sectorsize;
device->fd = fd;
device->writeable = 1;
- device->total_bytes = block_count;
+ device->total_bytes = device_total_bytes;
device->bytes_used = 0;
device->total_ios = 0;
device->dev_root = root->fs_info->dev_root;
device->name = strdup(path);
+ if (!device->name)
+ goto err_nomem;
+ INIT_LIST_HEAD(&device->dev_list);
ret = btrfs_add_device(trans, root, device);
BUG_ON(ret);
- total_bytes = btrfs_super_total_bytes(super) + block_count;
- btrfs_set_super_total_bytes(super, total_bytes);
+ fs_total_bytes = btrfs_super_total_bytes(super) + device_total_bytes;
+ btrfs_set_super_total_bytes(super, fs_total_bytes);
num_devs = btrfs_super_num_devices(super) + 1;
btrfs_set_super_num_devices(super, num_devs);
list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
device->fs_devices = root->fs_info->fs_devices;
return 0;
+
+err_nomem:
+ kfree(device);
+ kfree(buf);
+ return -ENOMEM;
}
-static void btrfs_wipe_existing_sb(int fd)
+static int btrfs_wipe_existing_sb(int fd)
{
const char *off = NULL;
size_t len = 0;
loff_t offset;
char buf[BUFSIZ];
- int rc = 0;
+ int ret = 0;
blkid_probe pr = NULL;
pr = blkid_new_probe();
if (!pr)
- return;
+ return -1;
- if (blkid_probe_set_device(pr, fd, 0, 0))
+ if (blkid_probe_set_device(pr, fd, 0, 0)) {
+ ret = -1;
goto out;
+ }
- rc = blkid_probe_lookup_value(pr, "SBMAGIC_OFFSET", &off, NULL);
- if (!rc)
- rc = blkid_probe_lookup_value(pr, "SBMAGIC", NULL, &len);
+ ret = blkid_probe_lookup_value(pr, "SBMAGIC_OFFSET", &off, NULL);
+ if (!ret)
+ ret = blkid_probe_lookup_value(pr, "SBMAGIC", NULL, &len);
- if (rc || len == 0 || off == NULL)
+ if (ret || len == 0 || off == NULL) {
+ /*
+ * If lookup fails, the probe did not find any values, eg. for
+ * a file image or a loop device. Soft error.
+ */
+ ret = 1;
goto out;
+ }
offset = strtoll(off, NULL, 10);
if (len > sizeof(buf))
len = sizeof(buf);
memset(buf, 0, len);
- rc = pwrite(fd, buf, len, offset);
+ ret = pwrite(fd, buf, len, offset);
+ if (ret < 0) {
+ error("cannot wipe existing superblock: %s", strerror(errno));
+ ret = -1;
+ } else if (ret != len) {
+ error("cannot wipe existing superblock: wrote %d of %zd", ret, len);
+ ret = -1;
+ }
fsync(fd);
out:
blkid_free_probe(pr);
- return;
+ return ret;
}
-int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
- u64 max_block_count, int *mixed, int discard)
+int btrfs_prepare_device(int fd, const char *file, int zero_end,
+ u64 *block_count_ret, u64 max_block_count, int discard)
{
u64 block_count;
struct stat st;
ret = fstat(fd, &st);
if (ret < 0) {
- fprintf(stderr, "unable to stat %s\n", file);
+ error("unable to stat %s: %s", file, strerror(errno));
return 1;
}
block_count = btrfs_device_size(fd, &st);
if (block_count == 0) {
- fprintf(stderr, "unable to find %s size\n", file);
+ error("unable to determine size of %s", file);
return 1;
}
if (max_block_count)
block_count = min(block_count, max_block_count);
- if (block_count < BTRFS_MKFS_SMALL_VOLUME_SIZE && !(*mixed))
- *mixed = 1;
-
if (discard) {
/*
* We intentionally ignore errors from the discard ioctl. It
ZERO_DEV_BYTES, block_count);
if (ret < 0) {
- fprintf(stderr, "ERROR: failed to zero device '%s' - %s\n",
- file, strerror(-ret));
+ error("failed to zero device '%s': %s", file, strerror(-ret));
return 1;
}
- btrfs_wipe_existing_sb(fd);
+ ret = btrfs_wipe_existing_sb(fd);
+ if (ret < 0) {
+ error("cannot wipe superblocks on %s", file);
+ return 1;
+ }
*block_count_ret = block_count;
return 0;
if (stat(path, &statbuf) < 0)
return -errno;
- return S_ISBLK(statbuf.st_mode);
+ return !!S_ISBLK(statbuf.st_mode);
}
/*
* return BTRFS_ARG_UUID: given input is uuid
* return BTRFS_ARG_MNTPOINT: given input is path
* return BTRFS_ARG_REG: given input is regular file
+ * return BTRFS_ARG_BLKDEV: given input is block device
*/
int check_arg_type(const char *input)
{
ret = is_block_device(dev);
if (ret <= 0) {
if (!ret) {
- fprintf(stderr, "%s is not a block device\n", dev);
+ error("not a block device: %s", dev);
ret = -EINVAL;
} else {
- fprintf(stderr, "Could not check %s: %s\n",
- dev, strerror(-ret));
+ error("cannot check %s: %s", dev, strerror(-ret));
}
goto out;
}
fd = open(dev, O_RDONLY);
if (fd < 0) {
ret = -errno;
- fprintf(stderr, "Could not open %s: %s\n", dev, strerror(errno));
+ error("cannot open %s: %s", dev, strerror(errno));
goto out;
}
*
* On error, return -1, errno should be set.
*/
-int open_path_or_dev_mnt(const char *path, DIR **dirstream)
+int open_path_or_dev_mnt(const char *path, DIR **dirstream, int verbose)
{
- char mp[BTRFS_PATH_NAME_MAX + 1];
- int fdmnt;
+ char mp[PATH_MAX];
+ int ret;
if (is_block_device(path)) {
- int ret;
-
ret = get_btrfs_mount(path, mp, sizeof(mp));
if (ret < 0) {
/* not a mounted btrfs dev */
+ error_on(verbose, "'%s' is not a mounted btrfs device",
+ path);
errno = EINVAL;
return -1;
}
- fdmnt = open_file_or_dir(mp, dirstream);
+ ret = open_file_or_dir(mp, dirstream);
+ error_on(verbose && ret < 0, "can't access '%s': %s",
+ path, strerror(errno));
} else {
- fdmnt = open_file_or_dir(path, dirstream);
+ ret = btrfs_open_dir(path, dirstream, 1);
+ }
+
+ return ret;
+}
+
+/*
+ * Do the following checks before calling open_file_or_dir():
+ * 1: path is in a btrfs filesystem
+ * 2: path is a directory
+ */
+int btrfs_open_dir(const char *path, DIR **dirstream, int verbose)
+{
+ struct statfs stfs;
+ struct stat st;
+ int ret;
+
+ if (statfs(path, &stfs) != 0) {
+ error_on(verbose, "cannot access '%s': %s", path,
+ strerror(errno));
+ return -1;
+ }
+
+ if (stfs.f_type != BTRFS_SUPER_MAGIC) {
+ error_on(verbose, "not a btrfs filesystem: %s", path);
+ return -2;
}
- return fdmnt;
+ if (stat(path, &st) != 0) {
+ error_on(verbose, "cannot access '%s': %s", path,
+ strerror(errno));
+ return -1;
+ }
+
+ if (!S_ISDIR(st.st_mode)) {
+ error_on(verbose, "not a directory: %s", path);
+ return -3;
+ }
+
+ ret = open_file_or_dir(path, dirstream);
+ if (ret < 0) {
+ error_on(verbose, "cannot access '%s': %s", path,
+ strerror(errno));
+ }
+
+ return ret;
}
/* checks if a device is a loop device */
MAJOR(statbuf.st_rdev) == LOOP_MAJOR);
}
+/*
+ * Takes a loop device path (e.g. /dev/loop0) and returns
+ * the associated file (e.g. /images/my_btrfs.img) using
+ * loopdev API
+ */
+static int resolve_loop_device_with_loopdev(const char* loop_dev, char* loop_file)
+{
+ int fd;
+ int ret;
+ struct loop_info64 lo64;
+
+ fd = open(loop_dev, O_RDONLY | O_NONBLOCK);
+ if (fd < 0)
+ return -errno;
+ ret = ioctl(fd, LOOP_GET_STATUS64, &lo64);
+ if (ret < 0) {
+ ret = -errno;
+ goto out;
+ }
+
+ memcpy(loop_file, lo64.lo_file_name, sizeof(lo64.lo_file_name));
+ loop_file[sizeof(lo64.lo_file_name)] = 0;
+
+out:
+ close(fd);
+
+ return ret;
+}
/* Takes a loop device path (e.g. /dev/loop0) and returns
* the associated file (e.g. /images/my_btrfs.img) */
if (!realpath(loop_dev, real_loop_dev))
return -errno;
snprintf(p, PATH_MAX, "/sys/block/%s/loop/backing_file", strrchr(real_loop_dev, '/'));
- if (!(f = fopen(p, "r")))
+ if (!(f = fopen(p, "r"))) {
+ if (errno == ENOENT)
+ /*
+ * It's possibly a partitioned loop device, which is
+ * resolvable with loopdev API.
+ */
+ return resolve_loop_device_with_loopdev(loop_dev, loop_file);
return -errno;
+ }
snprintf(fmt, 20, "%%%i[^\n]", max_len-1);
ret = fscanf(f, fmt, loop_file);
fd = open(file, O_RDONLY);
if (fd < 0) {
- fprintf (stderr, "check_mounted(): Could not open %s\n", file);
+ error("mount check: cannot open %s: %s", file,
+ strerror(errno));
return -errno;
}
struct btrfs_ioctl_vol_args args;
int fd;
int ret;
- int e;
fd = open("/dev/btrfs-control", O_RDWR);
if (fd < 0) {
- fprintf(stderr, "failed to open /dev/btrfs-control "
- "skipping device registration: %s\n",
+ warning(
+ "failed to open /dev/btrfs-control, skipping device registration: %s",
strerror(errno));
return -errno;
}
- strncpy(args.name, fname, BTRFS_PATH_NAME_MAX);
- args.name[BTRFS_PATH_NAME_MAX-1] = 0;
+ memset(&args, 0, sizeof(args));
+ strncpy_null(args.name, fname);
ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
- e = errno;
if (ret < 0) {
- fprintf(stderr, "ERROR: device scan failed '%s' - %s\n",
- fname, strerror(e));
- ret = -e;
+ error("device scan failed on '%s': %s", fname,
+ strerror(errno));
+ ret = -errno;
}
close(fd);
return ret;
*/
int btrfs_register_all_devices(void)
{
- int err;
+ int err = 0;
+ int ret = 0;
struct btrfs_fs_devices *fs_devices;
struct btrfs_device *device;
struct list_head *all_uuids;
list_for_each_entry(fs_devices, all_uuids, list) {
list_for_each_entry(device, &fs_devices->devices, dev_list) {
- if (strlen(device->name) != 0) {
+ if (*device->name)
err = btrfs_register_one_device(device->name);
- if (err < 0)
- return err;
- if (err > 0)
- return -err;
- }
+
+ if (err)
+ ret++;
}
}
- return 0;
+
+ return ret;
}
int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
return ret;
}
+/*
+ * Note: this function uses a static per-thread buffer. Do not call this
+ * function more than 10 times within one argument list!
+ */
+const char *pretty_size_mode(u64 size, unsigned mode)
+{
+ static __thread int ps_index = 0;
+ static __thread char ps_array[10][32];
+ char *ret;
+
+ ret = ps_array[ps_index];
+ ps_index++;
+ ps_index %= 10;
+ (void)pretty_size_snprintf(size, ret, 32, mode);
+
+ return ret;
+}
+
static const char* unit_suffix_binary[] =
{ "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
static const char* unit_suffix_decimal[] =
size /= mult;
num_divs++;
}
+ /*
+ * If the value is smaller than base, we didn't do any
+ * division, in that case, base should be 1, not original
+ * base, or the unit will be wrong
+ */
+ if (num_divs == 0)
+ base = 1;
}
if (num_divs >= ARRAY_SIZE(unit_suffix_binary)) {
}
/*
- * __strncpy__null - strncpy with null termination
+ * __strncpy_null - strncpy with null termination
* @dest: the target array
* @src: the source string
* @n: maximum bytes to copy (size of *dest)
* byte ('\0'), to the buffer pointed to by dest, up to a maximum
* of n bytes. Then ensure that dest is null-terminated.
*/
-char *__strncpy__null(char *dest, const char *src, size_t n)
+char *__strncpy_null(char *dest, const char *src, size_t n)
{
strncpy(dest, src, n);
if (n > 0)
return 0;
}
-static int set_label_mounted(const char *mount_path, const char *label)
+static int set_label_mounted(const char *mount_path, const char *labelp)
{
int fd;
+ char label[BTRFS_LABEL_SIZE];
fd = open(mount_path, O_RDONLY | O_NOATIME);
if (fd < 0) {
return -1;
}
+ memset(label, 0, sizeof(label));
+ strncpy(label, labelp, sizeof(label));
if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
fprintf(stderr, "ERROR: unable to set label %s\n",
strerror(errno));
return 0;
}
-static int get_label_unmounted(const char *dev, char *label)
+int get_label_unmounted(const char *dev, char *label)
{
struct btrfs_root *root;
int ret;
fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
return -1;
}
- if (ret > 0) {
- fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
- dev);
- return -1;
- }
/* Open the super_block at the default location
* and as read-only.
{
char label[BTRFS_LABEL_SIZE];
int fd;
+ int ret;
fd = open(mount_path, O_RDONLY | O_NOATIME);
if (fd < 0) {
}
memset(label, '\0', sizeof(label));
- if (ioctl(fd, BTRFS_IOC_GET_FSLABEL, label) < 0) {
- fprintf(stderr, "ERROR: unable get label %s\n", strerror(errno));
+ ret = ioctl(fd, BTRFS_IOC_GET_FSLABEL, label);
+ if (ret < 0) {
+ if (errno != ENOTTY)
+ fprintf(stderr, "ERROR: unable to get label %s\n",
+ strerror(errno));
+ ret = -errno;
close(fd);
- return -1;
+ return ret;
}
strncpy(labelp, label, sizeof(label));
}
/*
- * Unsafe subvolume check.
- *
- * This only checks ino == BTRFS_FIRST_FREE_OBJECTID, even it is not in a
- * btrfs mount point.
- * Must use together with other reliable method like btrfs ioctl.
- */
-static int __is_subvol(const char *path)
-{
- struct stat st;
- int ret;
-
- ret = lstat(path, &st);
- if (ret < 0)
- return ret;
-
- return st.st_ino == BTRFS_FIRST_FREE_OBJECTID;
-}
-
-/*
* A not-so-good version fls64. No fascinating optimization since
* no one except parse_size use it
*/
path:
/* Path format like subv at 'my_subvol' is the fallback case */
- ret = __is_subvol(p);
+ ret = test_issubvolume(p);
if (ret < 0 || !ret)
goto err;
fd = open(p, O_RDONLY);
memset(&di_args->uuid, '\0', sizeof(di_args->uuid));
ret = ioctl(fd, BTRFS_IOC_DEV_INFO, di_args);
- return ret ? -errno : 0;
+ return ret < 0 ? -errno : 0;
}
static u64 find_max_device_id(struct btrfs_ioctl_search_args *search_args,
struct btrfs_fs_devices *fs_devices_mnt = NULL;
struct btrfs_ioctl_dev_info_args *di_args;
struct btrfs_ioctl_dev_info_args tmp;
- char mp[BTRFS_PATH_NAME_MAX + 1];
+ char mp[PATH_MAX];
DIR *dirstream = NULL;
memset(fi_args, 0, sizeof(*fi_args));
- if (is_block_device(path)) {
+ if (is_block_device(path) == 1) {
struct btrfs_super_block *disk_super;
char buf[BTRFS_SUPER_INFO_SIZE];
u64 devid;
fd = open(path, O_RDONLY);
if (fd < 0) {
ret = -errno;
- fprintf(stderr, "Couldn't open %s: %s\n",
- path, strerror(errno));
+ error("cannot open %s: %s", path, strerror(errno));
goto out;
}
ret = check_mounted_where(fd, path, mp, sizeof(mp),
* 0 for nothing found
* -1 for internal error
*/
-static int
-check_overwrite(
- char *device)
+static int check_overwrite(const char *device)
{
const char *type;
blkid_probe pr = NULL;
}
int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
- u64 dev_cnt, int mixed)
+ u64 dev_cnt, int mixed, int ssd)
{
u64 allowed = 0;
if (dev_cnt > 1 &&
((metadata_profile | data_profile) & BTRFS_BLOCK_GROUP_DUP)) {
- fprintf(stderr,
- "ERROR: DUP is not allowed when FS has multiple devices\n");
- return 1;
+ warning("DUP is not recommended on filesystem with multiple devices");
}
if (metadata_profile & ~allowed) {
fprintf(stderr,
return 1;
}
- if (!mixed && (data_profile & BTRFS_BLOCK_GROUP_DUP)) {
- fprintf(stderr,
- "ERROR: DUP for data is allowed only in mixed mode");
- return 1;
- }
+ warning_on(!mixed && (data_profile & BTRFS_BLOCK_GROUP_DUP) && ssd,
+ "DUP may not actually lead to 2 copies on the device, see manual page");
+
return 0;
}
* 1: something is wrong, an error is printed
* 0: all is fine
*/
-int test_dev_for_mkfs(char *file, int force_overwrite)
+int test_dev_for_mkfs(const char *file, int force_overwrite)
{
int ret, fd;
struct stat st;
return 0;
}
-int btrfs_scan_lblkid()
+int btrfs_scan_lblkid(void)
{
int fd = -1;
int ret;
if (btrfs_scan_done)
return 0;
- if (blkid_get_cache(&cache, 0) < 0) {
+ if (blkid_get_cache(&cache, NULL) < 0) {
printf("ERROR: lblkid cache get failed\n");
return 1;
}
return 0;
}
-int is_vol_small(char *file)
+int is_vol_small(const char *file)
{
int fd = -1;
int e;
* first whitespace delimited token is a case insensitive match with yes
* or y.
*/
-int ask_user(char *question)
+int ask_user(const char *question)
{
char buf[30] = {0,};
char *saveptr = NULL;
{
struct btrfs_ioctl_ino_lookup_args args;
int ret;
- int e;
memset(&args, 0, sizeof(args));
args.treeid = 0;
args.objectid = BTRFS_FIRST_FREE_OBJECTID;
ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
- e = errno;
- if (ret) {
+ if (ret < 0) {
fprintf(stderr, "ERROR: Failed to lookup root id - %s\n",
- strerror(e));
+ strerror(errno));
return ret;
}
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
+ * Test if path is a directory
+ * Returns:
+ * 0 - path exists but it is not a directory
+ * 1 - path exists and it is a directory
+ * < 0 - error
*/
int test_isdir(const char *path)
{
int ret;
ret = stat(path, &st);
- if(ret < 0 )
- return -1;
+ if (ret < 0)
+ return -errno;
- return S_ISDIR(st.st_mode);
+ return !!S_ISDIR(st.st_mode);
}
void units_set_mode(unsigned *units, unsigned mode)
return 1;
}
-char* btrfs_group_type_str(u64 flag)
+const char* btrfs_group_type_str(u64 flag)
{
u64 mask = BTRFS_BLOCK_GROUP_TYPE_MASK |
BTRFS_SPACE_INFO_GLOBAL_RSV;
}
}
-char* btrfs_group_profile_str(u64 flag)
+const char* btrfs_group_profile_str(u64 flag)
{
switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
case 0:
}
}
-u64 disk_size(char *path)
+u64 disk_size(const char *path)
{
struct statfs sfs;
return sfs.f_bsize * sfs.f_blocks;
}
-u64 get_partition_size(char *dev)
+u64 get_partition_size(const char *dev)
{
u64 result;
int fd = open(dev, O_RDONLY);
return v2_supported;
}
-int btrfs_check_nodesize(u32 nodesize, u32 sectorsize)
+int btrfs_check_nodesize(u32 nodesize, u32 sectorsize, u64 features)
{
if (nodesize < sectorsize) {
fprintf(stderr,
"ERROR: Illegal nodesize %u (not aligned to %u)\n",
nodesize, sectorsize);
return -1;
+ } else if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS &&
+ nodesize != sectorsize) {
+ fprintf(stderr,
+ "ERROR: Illegal nodesize %u (not equal to %u for mixed block group)\n",
+ nodesize, sectorsize);
+ return -1;
}
return 0;
}
+
+/*
+ * Copy a path argument from SRC to DEST and check the SRC length if it's at
+ * most PATH_MAX and fits into DEST. DESTLEN is supposed to be exact size of
+ * the buffer.
+ * The destination buffer is zero terminated.
+ * Return < 0 for error, 0 otherwise.
+ */
+int arg_copy_path(char *dest, const char *src, int destlen)
+{
+ size_t len = strlen(src);
+
+ if (len >= PATH_MAX || len >= destlen)
+ return -ENAMETOOLONG;
+
+ __strncpy_null(dest, src, destlen);
+
+ return 0;
+}
+
+unsigned int get_unit_mode_from_arg(int *argc, char *argv[], int df_mode)
+{
+ unsigned int unit_mode = UNITS_DEFAULT;
+ int arg_i;
+ int arg_end;
+
+ for (arg_i = 0; arg_i < *argc; arg_i++) {
+ if (!strcmp(argv[arg_i], "--"))
+ break;
+
+ if (!strcmp(argv[arg_i], "--raw")) {
+ unit_mode = UNITS_RAW;
+ argv[arg_i] = NULL;
+ continue;
+ }
+ if (!strcmp(argv[arg_i], "--human-readable")) {
+ unit_mode = UNITS_HUMAN_BINARY;
+ argv[arg_i] = NULL;
+ continue;
+ }
+
+ if (!strcmp(argv[arg_i], "--iec")) {
+ units_set_mode(&unit_mode, UNITS_BINARY);
+ argv[arg_i] = NULL;
+ continue;
+ }
+ if (!strcmp(argv[arg_i], "--si")) {
+ units_set_mode(&unit_mode, UNITS_DECIMAL);
+ argv[arg_i] = NULL;
+ continue;
+ }
+
+ if (!strcmp(argv[arg_i], "--kbytes")) {
+ units_set_base(&unit_mode, UNITS_KBYTES);
+ argv[arg_i] = NULL;
+ continue;
+ }
+ if (!strcmp(argv[arg_i], "--mbytes")) {
+ units_set_base(&unit_mode, UNITS_MBYTES);
+ argv[arg_i] = NULL;
+ continue;
+ }
+ if (!strcmp(argv[arg_i], "--gbytes")) {
+ units_set_base(&unit_mode, UNITS_GBYTES);
+ argv[arg_i] = NULL;
+ continue;
+ }
+ if (!strcmp(argv[arg_i], "--tbytes")) {
+ units_set_base(&unit_mode, UNITS_TBYTES);
+ argv[arg_i] = NULL;
+ continue;
+ }
+
+ if (!df_mode)
+ continue;
+
+ if (!strcmp(argv[arg_i], "-b")) {
+ unit_mode = UNITS_RAW;
+ argv[arg_i] = NULL;
+ continue;
+ }
+ if (!strcmp(argv[arg_i], "-h")) {
+ unit_mode = UNITS_HUMAN_BINARY;
+ argv[arg_i] = NULL;
+ continue;
+ }
+ if (!strcmp(argv[arg_i], "-H")) {
+ unit_mode = UNITS_HUMAN_DECIMAL;
+ argv[arg_i] = NULL;
+ continue;
+ }
+ if (!strcmp(argv[arg_i], "-k")) {
+ units_set_base(&unit_mode, UNITS_KBYTES);
+ argv[arg_i] = NULL;
+ continue;
+ }
+ if (!strcmp(argv[arg_i], "-m")) {
+ units_set_base(&unit_mode, UNITS_MBYTES);
+ argv[arg_i] = NULL;
+ continue;
+ }
+ if (!strcmp(argv[arg_i], "-g")) {
+ units_set_base(&unit_mode, UNITS_GBYTES);
+ argv[arg_i] = NULL;
+ continue;
+ }
+ if (!strcmp(argv[arg_i], "-t")) {
+ units_set_base(&unit_mode, UNITS_TBYTES);
+ argv[arg_i] = NULL;
+ continue;
+ }
+ }
+
+ for (arg_i = 0, arg_end = 0; arg_i < *argc; arg_i++) {
+ if (!argv[arg_i])
+ continue;
+ argv[arg_end] = argv[arg_i];
+ arg_end++;
+ }
+
+ *argc = arg_end;
+
+ return unit_mode;
+}
+
+int string_is_numerical(const char *str)
+{
+ if (!(*str >= '0' && *str <= '9'))
+ return 0;
+ while (*str >= '0' && *str <= '9')
+ str++;
+ if (*str != '\0')
+ return 0;
+ return 1;
+}
+
+/*
+ * Preprocess @argv with getopt_long to reorder options and consume the "--"
+ * option separator.
+ * Unknown short and long options are reported, optionally the @usage is printed
+ * before exit.
+ */
+void clean_args_no_options(int argc, char *argv[], const char * const *usagestr)
+{
+ static const struct option long_options[] = {
+ {NULL, 0, NULL, 0}
+ };
+
+ while (1) {
+ int c = getopt_long(argc, argv, "", long_options, NULL);
+
+ if (c < 0)
+ break;
+
+ switch (c) {
+ default:
+ if (usagestr)
+ usage(usagestr);
+ }
+ }
+}
+
+/* Subvolume helper functions */
+/*
+ * 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 subvolume
+ * Returns:
+ * 0 - path exists but it is not a subvolume
+ * 1 - path exists and it is a subvolume
+ * < 0 - error
+ */
+int test_issubvolume(const char *path)
+{
+ struct stat st;
+ struct statfs stfs;
+ int res;
+
+ res = stat(path, &st);
+ if (res < 0)
+ return -errno;
+
+ if (st.st_ino != BTRFS_FIRST_FREE_OBJECTID || !S_ISDIR(st.st_mode))
+ return 0;
+
+ res = statfs(path, &stfs);
+ if (res < 0)
+ return -errno;
+
+ return (int)stfs.f_type == BTRFS_SUPER_MAGIC;
+}
+
+const char *subvol_strip_mountpoint(const char *mnt, const char *full_path)
+{
+ int len = strlen(mnt);
+ if (!len)
+ return full_path;
+
+ if (mnt[len - 1] != '/')
+ len += 1;
+
+ return full_path + len;
+}
+
+/*
+ * Returns
+ * <0: Std error
+ * 0: All fine
+ * 1: Error; and error info printed to the terminal. Fixme.
+ * 2: If the fullpath is root tree instead of subvol tree
+ */
+int get_subvol_info(const char *fullpath, struct root_info *get_ri)
+{
+ u64 sv_id;
+ int ret = 1;
+ int fd = -1;
+ int mntfd = -1;
+ char *mnt = NULL;
+ const char *svpath = NULL;
+ DIR *dirstream1 = NULL;
+ DIR *dirstream2 = NULL;
+
+ ret = test_issubvolume(fullpath);
+ if (ret < 0)
+ return ret;
+ if (!ret) {
+ error("not a subvolume: %s", fullpath);
+ return 1;
+ }
+
+ ret = find_mount_root(fullpath, &mnt);
+ if (ret < 0)
+ return ret;
+ if (ret > 0) {
+ error("%s doesn't belong to btrfs mount point", fullpath);
+ return 1;
+ }
+ ret = 1;
+ svpath = subvol_strip_mountpoint(mnt, fullpath);
+
+ fd = btrfs_open_dir(fullpath, &dirstream1, 1);
+ if (fd < 0)
+ goto out;
+
+ ret = btrfs_list_get_path_rootid(fd, &sv_id);
+ if (ret) {
+ error("can't get rootid for '%s'", fullpath);
+ goto out;
+ }
+
+ mntfd = btrfs_open_dir(mnt, &dirstream2, 1);
+ if (mntfd < 0)
+ goto out;
+
+ if (sv_id == BTRFS_FS_TREE_OBJECTID) {
+ ret = 2;
+ /*
+ * So that caller may decide if thats an error or just fine.
+ */
+ goto out;
+ }
+
+ memset(get_ri, 0, sizeof(*get_ri));
+ get_ri->root_id = sv_id;
+
+ ret = btrfs_get_subvol(mntfd, get_ri);
+ if (ret)
+ error("can't find '%s': %d", svpath, ret);
+
+out:
+ close_file_or_dir(mntfd, dirstream2);
+ close_file_or_dir(mntfd, dirstream1);
+ free(mnt);
+
+ return ret;
+}