* Boston, MA 021110-1307, USA.
*/
-#define _XOPEN_SOURCE 700
-#define __USE_XOPEN2K8
-#define __XOPEN2K8 /* due to an error in dirent.h, to get dirfd() */
-#define _GNU_SOURCE /* O_NOATIME */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/types.h>
#include <sys/stat.h>
+#include <sys/sysinfo.h>
#include <uuid/uuid.h>
#include <fcntl.h>
#include <unistd.h>
#include <limits.h>
#include <blkid/blkid.h>
#include <sys/vfs.h>
+#include <sys/statfs.h>
+#include <linux/magic.h>
+#include <getopt.h>
+
+#include <btrfsutil.h>
#include "kerncompat.h"
#include "radix-tree.h"
#include "utils.h"
#include "volumes.h"
#include "ioctl.h"
+#include "commands.h"
+#include "mkfs/common.h"
#ifndef BLKDISCARD
#define BLKDISCARD _IO(0x12,119)
static int btrfs_scan_done = 0;
-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)
-{
- strncpy(argv0_buf, argv[0], sizeof(argv0_buf));
- argv0_buf[sizeof(argv0_buf) - 1] = 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;
-}
+static int rand_seed_initlized = 0;
+static unsigned short rand_seed[3];
+struct btrfs_config bconf;
/*
* Discard the given range in one go
{
while (len > 0) {
/* 1G granularity */
- u64 chunk_size = min_t(u64, len, 1*1024*1024*1024);
+ u64 chunk_size = min_t(u64, len, SZ_1G);
int ret;
ret = discard_range(fd, start, chunk_size);
return 0;
}
-static u64 reference_root_table[] = {
- [1] = BTRFS_ROOT_TREE_OBJECTID,
- [2] = BTRFS_EXTENT_TREE_OBJECTID,
- [3] = BTRFS_CHUNK_TREE_OBJECTID,
- [4] = BTRFS_DEV_TREE_OBJECTID,
- [5] = BTRFS_FS_TREE_OBJECTID,
- [6] = BTRFS_CSUM_TREE_OBJECTID,
-};
-
int test_uuid_unique(char *fs_uuid)
{
int unique = 1;
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;
}
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 = NULL;
- struct btrfs_root_item root_item;
- struct btrfs_disk_key disk_key;
- struct btrfs_extent_item *extent_item;
- struct btrfs_inode_item *inode_item;
- struct btrfs_chunk *chunk;
- struct btrfs_dev_item *dev_item;
- struct btrfs_dev_extent *dev_extent;
- u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
- u8 *ptr;
- int i;
- int ret;
- u32 itemoff;
- u32 nritems = 0;
- u64 first_free;
- u64 ref_root;
- u32 array_size;
- u32 item_size;
- int skinny_metadata = !!(features &
- BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA);
-
- first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
- first_free &= ~((u64)sectorsize - 1);
-
- memset(&super, 0, sizeof(super));
-
- num_bytes = (num_bytes / sectorsize) * sectorsize;
- 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);
-
- btrfs_set_super_bytenr(&super, 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_total_bytes(&super, num_bytes);
- btrfs_set_super_bytes_used(&super, 6 * leafsize);
- btrfs_set_super_sectorsize(&super, sectorsize);
- btrfs_set_super_leafsize(&super, leafsize);
- btrfs_set_super_nodesize(&super, nodesize);
- btrfs_set_super_stripesize(&super, 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, leafsize));
-
- /* create the tree of root objects */
- memset(buf->data, 0, leafsize);
- buf->len = leafsize;
- btrfs_set_header_bytenr(buf, 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_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
- write_extent_buffer(buf, super.fsid, btrfs_header_fsid(),
- BTRFS_FSID_SIZE);
-
- write_extent_buffer(buf, chunk_tree_uuid,
- btrfs_header_chunk_tree_uuid(buf),
- BTRFS_UUID_SIZE);
-
- /* create the items for the root tree */
- memset(&root_item, 0, sizeof(root_item));
- inode_item = &root_item.inode;
- 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, leafsize);
- btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
- btrfs_set_root_refs(&root_item, 1);
- btrfs_set_root_used(&root_item, leafsize);
- btrfs_set_root_generation(&root_item, 1);
-
- memset(&disk_key, 0, sizeof(disk_key));
- btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
- btrfs_set_disk_key_offset(&disk_key, 0);
- nritems = 0;
-
- itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, 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);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(root_item));
- write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
- nritems), sizeof(root_item));
- nritems++;
-
- itemoff = itemoff - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, 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);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(root_item));
- write_extent_buffer(buf, &root_item,
- btrfs_item_ptr_offset(buf, nritems),
- sizeof(root_item));
- nritems++;
-
- itemoff = itemoff - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, 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);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(root_item));
- write_extent_buffer(buf, &root_item,
- btrfs_item_ptr_offset(buf, nritems),
- sizeof(root_item));
- nritems++;
-
- itemoff = itemoff - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, 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);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(root_item));
- write_extent_buffer(buf, &root_item,
- btrfs_item_ptr_offset(buf, nritems),
- sizeof(root_item));
- nritems++;
-
-
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, leafsize, blocks[1]);
- if (ret != leafsize) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
-
- /* create the items for the extent tree */
- memset(buf->data+sizeof(struct btrfs_header), 0,
- leafsize-sizeof(struct btrfs_header));
- nritems = 0;
- itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize);
- 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]);
-
- /* create extent item */
- itemoff -= item_size;
- btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
- if (skinny_metadata) {
- btrfs_set_disk_key_type(&disk_key,
- BTRFS_METADATA_ITEM_KEY);
- btrfs_set_disk_key_offset(&disk_key, 0);
- } else {
- btrfs_set_disk_key_type(&disk_key,
- BTRFS_EXTENT_ITEM_KEY);
- btrfs_set_disk_key_offset(&disk_key, leafsize);
- }
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
- itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- item_size);
- extent_item = btrfs_item_ptr(buf, nritems,
- struct btrfs_extent_item);
- btrfs_set_extent_refs(buf, extent_item, 1);
- btrfs_set_extent_generation(buf, extent_item, 1);
- btrfs_set_extent_flags(buf, extent_item,
- BTRFS_EXTENT_FLAG_TREE_BLOCK);
- nritems++;
-
- /* create extent ref */
- ref_root = reference_root_table[i];
- btrfs_set_disk_key_objectid(&disk_key, 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_offset(buf, btrfs_item_nr(nritems),
- itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems), 0);
- nritems++;
- }
- btrfs_set_header_bytenr(buf, 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, leafsize, blocks[2]);
- if (ret != leafsize) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
-
- /* create the chunk tree */
- memset(buf->data+sizeof(struct btrfs_header), 0,
- leafsize-sizeof(struct btrfs_header));
- nritems = 0;
- item_size = sizeof(*dev_item);
- itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - item_size;
-
- /* first device 1 (there is no device 0) */
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
- btrfs_set_disk_key_offset(&disk_key, 1);
- btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
-
- dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item);
- btrfs_set_device_id(buf, dev_item, 1);
- btrfs_set_device_generation(buf, dev_item, 0);
- 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_type(buf, dev_item, 0);
-
- write_extent_buffer(buf, super.dev_item.uuid,
- (unsigned long)btrfs_device_uuid(dev_item),
- BTRFS_UUID_SIZE);
- write_extent_buffer(buf, super.fsid,
- (unsigned long)btrfs_device_fsid(dev_item),
- BTRFS_UUID_SIZE);
- read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item,
- sizeof(*dev_item));
-
- nritems++;
- item_size = btrfs_chunk_item_size(1);
- itemoff = itemoff - item_size;
-
- /* then we have chunk 0 */
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
- btrfs_set_disk_key_offset(&disk_key, 0);
- btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
-
- chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk);
- btrfs_set_chunk_length(buf, chunk, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
- 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_num_stripes(buf, chunk, 1);
- btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
- btrfs_set_stripe_offset_nr(buf, chunk, 0, 0);
- nritems++;
-
- write_extent_buffer(buf, super.dev_item.uuid,
- (unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe),
- BTRFS_UUID_SIZE);
-
- /* copy the key for the chunk to the system array */
- ptr = super.sys_chunk_array;
- array_size = sizeof(disk_key);
-
- memcpy(ptr, &disk_key, sizeof(disk_key));
- ptr += sizeof(disk_key);
-
- /* copy the chunk to the system array */
- read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
- array_size += item_size;
- ptr += item_size;
- btrfs_set_super_sys_array_size(&super, array_size);
-
- btrfs_set_header_bytenr(buf, 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, leafsize, blocks[3]);
- if (ret != leafsize) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
-
- /* create the device tree */
- memset(buf->data+sizeof(struct btrfs_header), 0,
- leafsize-sizeof(struct btrfs_header));
- nritems = 0;
- itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) -
- sizeof(struct btrfs_dev_extent);
-
- btrfs_set_disk_key_objectid(&disk_key, 1);
- btrfs_set_disk_key_offset(&disk_key, 0);
- btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(struct btrfs_dev_extent));
- dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent);
- btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
- BTRFS_CHUNK_TREE_OBJECTID);
- btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
- BTRFS_FIRST_CHUNK_TREE_OBJECTID);
- btrfs_set_dev_extent_chunk_offset(buf, dev_extent, 0);
-
- write_extent_buffer(buf, chunk_tree_uuid,
- (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
- BTRFS_UUID_SIZE);
-
- btrfs_set_dev_extent_length(buf, dev_extent,
- BTRFS_MKFS_SYSTEM_GROUP_SIZE);
- nritems++;
-
- btrfs_set_header_bytenr(buf, 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, leafsize, blocks[4]);
- if (ret != leafsize) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
-
- /* create the FS root */
- memset(buf->data+sizeof(struct btrfs_header), 0,
- leafsize-sizeof(struct btrfs_header));
- btrfs_set_header_bytenr(buf, 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, leafsize, blocks[5]);
- if (ret != leafsize) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
- /* finally create the csum root */
- memset(buf->data+sizeof(struct btrfs_header), 0,
- leafsize-sizeof(struct btrfs_header));
- btrfs_set_header_bytenr(buf, 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, leafsize, blocks[6]);
- if (ret != leafsize) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
-
- /* and write out the super block */
- BUG_ON(sizeof(super) > sectorsize);
- memset(buf->data, 0, sectorsize);
- memcpy(buf->data, &super, sizeof(super));
- buf->len = sectorsize;
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, sectorsize, blocks[0]);
- if (ret != sectorsize) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
-
- ret = 0;
-
-out:
- free(buf);
- return ret;
-}
-
u64 btrfs_device_size(int fd, struct stat *st)
{
u64 size;
return ret;
}
-#define ZERO_DEV_BYTES (2 * 1024 * 1024)
+#define ZERO_DEV_BYTES SZ_2M
/* 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)
}
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,
+ struct btrfs_root *root, int fd, const char *path,
+ 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_fs_info *fs_info = root->fs_info;
+ struct btrfs_super_block *super = 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 = kzalloc(sizeof(*device), GFP_NOFS);
- if (!device)
- return -ENOMEM;
- buf = kmalloc(sectorsize, GFP_NOFS);
+ device_total_bytes = (device_total_bytes / sectorsize) * sectorsize;
+
+ device = calloc(1, sizeof(*device));
+ if (!device) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ buf = calloc(1, sectorsize);
if (!buf) {
- kfree(device);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto out;
}
- 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->dev_root = fs_info->dev_root;
+ device->name = strdup(path);
+ if (!device->name) {
+ ret = -ENOMEM;
+ goto out;
+ }
- ret = btrfs_add_device(trans, root, device);
- BUG_ON(ret);
+ INIT_LIST_HEAD(&device->dev_list);
+ ret = btrfs_add_device(trans, fs_info, device);
+ if (ret)
+ goto out;
- 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);
memcpy(disk_super, super, sizeof(*disk_super));
- printf("adding device %s id %llu\n", path,
- (unsigned long long)device->devid);
-
btrfs_set_super_bytenr(disk_super, BTRFS_SUPER_INFO_OFFSET);
btrfs_set_stack_device_id(dev_item, device->devid);
btrfs_set_stack_device_type(dev_item, device->type);
ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
BUG_ON(ret != sectorsize);
- kfree(buf);
- list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
- device->fs_devices = root->fs_info->fs_devices;
+ free(buf);
+ list_add(&device->dev_list, &fs_info->fs_devices->devices);
+ device->fs_devices = fs_info->fs_devices;
return 0;
+
+out:
+ free(device);
+ free(buf);
+ return ret;
}
-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: %m");
+ 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, u64 *block_count_ret,
+ u64 max_block_count, unsigned opflags)
{
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: %m", file);
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) {
+ if (opflags & PREP_DEVICE_DISCARD) {
/*
* We intentionally ignore errors from the discard ioctl. It
* is not necessary for the mkfs functionality but just an
* optimization.
*/
if (discard_range(fd, 0, 0) == 0) {
- fprintf(stderr, "Performing full device TRIM (%s) ...\n",
- pretty_size(block_count));
+ if (opflags & PREP_DEVICE_VERBOSE)
+ printf("Performing full device TRIM %s (%s) ...\n",
+ file, pretty_size(block_count));
discard_blocks(fd, 0, 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)
+ if (!ret && (opflags & PREP_DEVICE_ZERO_END))
ret = zero_dev_clamped(fd, block_count - ZERO_DEV_BYTES,
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;
btrfs_set_stack_inode_generation(&inode_item, trans->transid);
btrfs_set_stack_inode_size(&inode_item, 0);
btrfs_set_stack_inode_nlink(&inode_item, 1);
- btrfs_set_stack_inode_nbytes(&inode_item, root->leafsize);
+ btrfs_set_stack_inode_nbytes(&inode_item, root->fs_info->nodesize);
btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0755);
btrfs_set_stack_timespec_sec(&inode_item.atime, now);
btrfs_set_stack_timespec_nsec(&inode_item.atime, 0);
btrfs_set_stack_timespec_nsec(&inode_item.ctime, 0);
btrfs_set_stack_timespec_sec(&inode_item.mtime, now);
btrfs_set_stack_timespec_nsec(&inode_item.mtime, 0);
- btrfs_set_stack_timespec_sec(&inode_item.otime, 0);
+ btrfs_set_stack_timespec_sec(&inode_item.otime, now);
btrfs_set_stack_timespec_nsec(&inode_item.otime, 0);
if (root->fs_info->tree_root == root)
if (stat(path, &statbuf) < 0)
return -errno;
- return S_ISBLK(statbuf.st_mode);
+ return !!S_ISBLK(statbuf.st_mode);
}
/*
return ret;
}
+int is_reg_file(const char *path)
+{
+ struct stat statbuf;
+
+ if (stat(path, &statbuf) < 0)
+ return -errno;
+ return S_ISREG(statbuf.st_mode);
+}
+
+int is_path_exist(const char *path)
+{
+ struct stat statbuf;
+ int ret;
+
+ ret = stat(path, &statbuf);
+ if (ret < 0) {
+ if (errno == ENOENT)
+ return 0;
+ else
+ return -errno;
+ }
+ return 1;
+}
+
/*
* This function checks if the given input parameter is
* an uuid or a path
- * return -1: some error in the given input
- * return 0: unknow input
- * return 1: given input is uuid
- * return 2: given input is path
+ * return <0 : some error in the given input
+ * return BTRFS_ARG_UNKNOWN: unknown input
+ * 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)
{
if (is_mount_point(path) == 1)
return BTRFS_ARG_MNTPOINT;
+ if (is_reg_file(path))
+ return BTRFS_ARG_REG;
+
return BTRFS_ARG_UNKNOWN;
}
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: %m", dev);
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': %m",
+ path);
} 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 if dir_only is 1
+ */
+int btrfs_open(const char *path, DIR **dirstream, int verbose, int dir_only)
+{
+ struct statfs stfs;
+ struct stat st;
+ int ret;
+
+ if (statfs(path, &stfs) != 0) {
+ error_on(verbose, "cannot access '%s': %m", path);
+ return -1;
+ }
+
+ if (stfs.f_type != BTRFS_SUPER_MAGIC) {
+ error_on(verbose, "not a btrfs filesystem: %s", path);
+ return -2;
+ }
+
+ if (stat(path, &st) != 0) {
+ error_on(verbose, "cannot access '%s': %m", path);
+ return -1;
}
- return fdmnt;
+ if (dir_only && !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': %m", path);
+ }
+
+ return ret;
+}
+
+int btrfs_open_dir(const char *path, DIR **dirstream, int verbose)
+{
+ return btrfs_open(path, dirstream, verbose, 1);
+}
+
+int btrfs_open_file_or_dir(const char *path, DIR **dirstream, int verbose)
+{
+ return btrfs_open(path, dirstream, verbose, 0);
}
/* 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);
return 0;
}
-/* Checks whether a and b are identical or device
+/*
+ * Checks whether a and b are identical or device
* files associated with the same block device
*/
static int is_same_blk_file(const char* a, const char* b)
strncpy_null(real_b, b);
/* Identical path? */
- if(strcmp(real_a, real_b) == 0)
+ if (strcmp(real_a, real_b) == 0)
return 1;
- if(stat(a, &st_buf_a) < 0 ||
- stat(b, &st_buf_b) < 0)
- {
+ if (stat(a, &st_buf_a) < 0 || stat(b, &st_buf_b) < 0) {
if (errno == ENOENT)
return 0;
return -errno;
}
/* Same blockdevice? */
- if(S_ISBLK(st_buf_a.st_mode) &&
- S_ISBLK(st_buf_b.st_mode) &&
- st_buf_a.st_rdev == st_buf_b.st_rdev)
- {
+ if (S_ISBLK(st_buf_a.st_mode) && S_ISBLK(st_buf_b.st_mode) &&
+ st_buf_a.st_rdev == st_buf_b.st_rdev) {
return 1;
}
/* Hardlink? */
if (st_buf_a.st_dev == st_buf_b.st_dev &&
- st_buf_a.st_ino == st_buf_b.st_ino)
- {
+ st_buf_a.st_ino == st_buf_b.st_ino) {
return 1;
}
const char* file)
{
int ret;
- struct list_head *head;
- struct list_head *cur;
struct btrfs_device *device;
- head = &fs_devices->devices;
- list_for_each(cur, head) {
- device = list_entry(cur, struct btrfs_device, dev_list);
-
+ list_for_each_entry(device, &fs_devices->devices, dev_list) {
if((ret = is_same_loop_file(device->name, file)))
return ret;
}
fd = open(file, O_RDONLY);
if (fd < 0) {
- fprintf (stderr, "check_mounted(): Could not open %s\n", file);
+ error("mount check: cannot open %s: %m", file);
return -errno;
}
/* scan the initial device */
ret = btrfs_scan_one_device(fd, file, &fs_devices_mnt,
- &total_devs, BTRFS_SUPER_INFO_OFFSET, 0);
+ &total_devs, BTRFS_SUPER_INFO_OFFSET, SBREAD_DEFAULT);
is_btrfs = (ret >= 0);
/* scan other devices */
if (is_btrfs && total_devs > 1) {
- ret = btrfs_scan_lblkid();
+ ret = btrfs_scan_devices();
if (ret)
return ret;
}
- /* iterate over the list of currently mountes filesystems */
+ /* iterate over the list of currently mounted filesystems */
if ((f = setmntent ("/proc/self/mounts", "r")) == NULL)
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",
- strerror(errno));
+ warning(
+ "failed to open /dev/btrfs-control, skipping device registration: %m");
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': %m", fname);
+ ret = -errno;
}
close(fd);
return ret;
/*
* Register all devices in the fs_uuid list created in the user
- * space. Ensure btrfs_scan_lblkid() is called before this func.
+ * space. Ensure btrfs_scan_devices() is called before this func.
*/
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,
ret = 0;
disk_super = (struct btrfs_super_block *)buf;
- if (btrfs_super_magic(disk_super) != BTRFS_MAGIC)
+ /*
+ * Accept devices from the same filesystem, allow partially created
+ * structures.
+ */
+ if (btrfs_super_magic(disk_super) != BTRFS_MAGIC &&
+ btrfs_super_magic(disk_super) != BTRFS_MAGIC_PARTIAL)
goto brelse;
if (!memcmp(disk_super->fsid, root->fs_info->super_copy->fsid,
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[] =
int mult = 0;
const char** suffix = NULL;
u64 last_size;
+ int negative;
if (str_size == 0)
return 0;
+ negative = !!(unit_mode & UNITS_NEGATIVE);
+ unit_mode &= ~UNITS_NEGATIVE;
+
if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_RAW) {
- snprintf(str, str_size, "%llu", size);
+ if (negative)
+ snprintf(str, str_size, "%lld", size);
+ else
+ snprintf(str, str_size, "%llu", size);
return 0;
}
num_divs = 0;
break;
default:
- while (size >= mult) {
- last_size = size;
- size /= mult;
- num_divs++;
+ if (negative) {
+ s64 ssize = (s64)size;
+ s64 last_ssize = ssize;
+
+ while ((ssize < 0 ? -ssize : ssize) >= mult) {
+ last_ssize = ssize;
+ ssize /= mult;
+ num_divs++;
+ }
+ last_size = (u64)last_ssize;
+ } else {
+ while (size >= mult) {
+ last_size = size;
+ 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)) {
assert(0);
return -1;
}
- fraction = (float)last_size / base;
+
+ if (negative) {
+ fraction = (float)(s64)last_size / base;
+ } else {
+ fraction = (float)last_size / base;
+ }
return snprintf(str, str_size, "%.2f%s", fraction, suffix[num_divs]);
}
/*
- * __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)
int len = strlen(input);
if (len > BTRFS_LABEL_SIZE - 1) {
- fprintf(stderr, "ERROR: Label %s is too long (max %d)\n",
- input, BTRFS_LABEL_SIZE - 1);
+ error("label %s is too long (max %d)", input,
+ BTRFS_LABEL_SIZE - 1);
return -1;
}
ret = check_mounted(dev);
if (ret < 0) {
- fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
+ error("checking mount status of %s failed: %d", dev, ret);
return -1;
}
if (ret > 0) {
- fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
- dev);
+ error("device %s is mounted, use mount point", dev);
return -1;
}
return -1;
trans = btrfs_start_transaction(root, 1);
- snprintf(root->fs_info->super_copy->label, BTRFS_LABEL_SIZE, "%s",
- label);
+ BUG_ON(IS_ERR(trans));
+ __strncpy_null(root->fs_info->super_copy->label, label, BTRFS_LABEL_SIZE - 1);
+
btrfs_commit_transaction(trans, root);
/* Now we close it since we are done. */
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) {
- fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
+ error("unable to access %s: %m", mount_path);
return -1;
}
+ memset(label, 0, sizeof(label));
+ __strncpy_null(label, labelp, BTRFS_LABEL_SIZE - 1);
if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
- fprintf(stderr, "ERROR: unable to set label %s\n",
- strerror(errno));
+ error("unable to set label of %s: %m", mount_path);
close(fd);
return -1;
}
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;
ret = check_mounted(dev);
if (ret < 0) {
- fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
+ error("checking mount status of %s failed: %d", dev, ret);
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.
if(!root)
return -1;
- memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
+ __strncpy_null(label, root->fs_info->super_copy->label,
+ BTRFS_LABEL_SIZE - 1);
/* Now we close it since we are done. */
close_ctree(root);
{
char label[BTRFS_LABEL_SIZE];
int fd;
+ int ret;
fd = open(mount_path, O_RDONLY | O_NOATIME);
if (fd < 0) {
- fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
+ error("unable to access %s: %m", mount_path);
return -1;
}
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)
+ error("unable to get label of %s: %m", mount_path);
+ ret = -errno;
close(fd);
- return -1;
+ return ret;
}
- strncpy(labelp, label, sizeof(label));
+ __strncpy_null(labelp, label, BTRFS_LABEL_SIZE - 1);
close(fd);
return 0;
}
return ret;
}
-int btrfs_scan_block_devices(int run_ioctl)
-{
-
- struct stat st;
- int ret;
- int fd;
- struct btrfs_fs_devices *tmp_devices;
- u64 num_devices;
- FILE *proc_partitions;
- int i;
- char buf[1024];
- char fullpath[110];
- int scans = 0;
- int special;
-
-scan_again:
- proc_partitions = fopen("/proc/partitions","r");
- if (!proc_partitions) {
- fprintf(stderr, "Unable to open '/proc/partitions' for scanning\n");
- return -ENOENT;
- }
- /* skip the header */
- for (i = 0; i < 2; i++)
- if (!fgets(buf, 1023, proc_partitions)) {
- fprintf(stderr,
- "Unable to read '/proc/partitions' for scanning\n");
- fclose(proc_partitions);
- return -ENOENT;
- }
-
- strcpy(fullpath,"/dev/");
- while(fgets(buf, 1023, proc_partitions)) {
- ret = sscanf(buf," %*d %*d %*d %99s", fullpath + 5);
- if (ret != 1) {
- fprintf(stderr,
- "failed to scan device name from /proc/partitions\n");
- break;
- }
-
- /*
- * multipath and MD devices may register as a btrfs filesystem
- * both through the original block device and through
- * the special (/dev/mapper or /dev/mdX) entry.
- * This scans the special entries last
- */
- special = strncmp(fullpath, "/dev/dm-", strlen("/dev/dm-")) == 0;
- if (!special)
- special = strncmp(fullpath, "/dev/md", strlen("/dev/md")) == 0;
-
- if (scans == 0 && special)
- continue;
- if (scans > 0 && !special)
- continue;
-
- ret = lstat(fullpath, &st);
- if (ret < 0) {
- fprintf(stderr, "failed to stat %s\n", fullpath);
- continue;
- }
- if (!S_ISBLK(st.st_mode)) {
- continue;
- }
-
- fd = open(fullpath, O_RDONLY);
- if (fd < 0) {
- if (errno != ENOMEDIUM)
- fprintf(stderr, "failed to open %s: %s\n",
- fullpath, strerror(errno));
- continue;
- }
- ret = btrfs_scan_one_device(fd, fullpath, &tmp_devices,
- &num_devices,
- BTRFS_SUPER_INFO_OFFSET, 0);
- if (ret == 0 && run_ioctl > 0) {
- btrfs_register_one_device(fullpath);
- }
- close(fd);
- }
-
- fclose(proc_partitions);
-
- if (scans == 0) {
- scans++;
- goto scan_again;
- }
- return 0;
-}
-
/*
* A not-so-good version fls64. No fascinating optimization since
* no one except parse_size use it
u64 ret;
if (!s) {
- fprintf(stderr, "ERROR: Size value is empty\n");
+ error("size value is empty");
exit(1);
}
if (s[0] == '-') {
- fprintf(stderr,
- "ERROR: Size value '%s' is less equal than 0\n", s);
+ error("size value '%s' is less equal than 0", s);
exit(1);
}
ret = strtoull(s, &endptr, 10);
if (endptr == s) {
- fprintf(stderr, "ERROR: Size value '%s' is invalid\n", s);
+ error("size value '%s' is invalid", s);
exit(1);
}
if (endptr[0] && endptr[1]) {
- fprintf(stderr, "ERROR: Illegal suffix contains character '%c' in wrong position\n",
+ error("illegal suffix contains character '%c' in wrong position",
endptr[1]);
exit(1);
}
* 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);
+ error("size value '%s' is too large for u64", s);
exit(1);
}
if (endptr[0]) {
case 'b':
break;
default:
- fprintf(stderr, "ERROR: Unknown size descriptor '%c'\n",
- c);
+ error("unknown size descriptor '%c'", c);
exit(1);
}
}
/* 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);
+ error("size value '%s' is too large for u64", s);
exit(1);
}
ret *= mult;
return ret;
}
+u64 parse_qgroupid(const char *p)
+{
+ char *s = strchr(p, '/');
+ const char *ptr_src_end = p + strlen(p);
+ char *ptr_parse_end = NULL;
+ enum btrfs_util_error err;
+ u64 level;
+ u64 id;
+ int fd;
+ int ret = 0;
+
+ if (p[0] == '/')
+ goto path;
+
+ /* Numeric format like '0/257' is the primary case */
+ if (!s) {
+ id = strtoull(p, &ptr_parse_end, 10);
+ if (ptr_parse_end != ptr_src_end)
+ goto path;
+ return id;
+ }
+ level = strtoull(p, &ptr_parse_end, 10);
+ if (ptr_parse_end != s)
+ goto path;
+
+ id = strtoull(s + 1, &ptr_parse_end, 10);
+ if (ptr_parse_end != ptr_src_end)
+ goto path;
+
+ return (level << BTRFS_QGROUP_LEVEL_SHIFT) | id;
+
+path:
+ /* Path format like subv at 'my_subvol' is the fallback case */
+ err = btrfs_util_is_subvolume(p);
+ if (err)
+ goto err;
+ fd = open(p, O_RDONLY);
+ if (fd < 0)
+ goto err;
+ ret = lookup_path_rootid(fd, &id);
+ if (ret)
+ error("failed to lookup root id: %s", strerror(-ret));
+ close(fd);
+ if (ret < 0)
+ goto err;
+ return id;
+
+err:
+ error("invalid qgroupid or subvolume path: %s", p);
+ exit(-1);
+}
+
int open_file_or_dir3(const char *fname, DIR **dirstream, int open_flags)
{
int ret;
}
if (fd < 0) {
fd = -1;
- if (*dirstream)
+ if (*dirstream) {
closedir(*dirstream);
+ *dirstream = NULL;
+ }
}
return fd;
}
void close_file_or_dir(int fd, DIR *dirstream)
{
- if (dirstream)
+ int old_errno;
+
+ old_errno = errno;
+ if (dirstream) {
closedir(dirstream);
- else if (fd >= 0)
+ } else if (fd >= 0) {
close(fd);
+ }
+
+ errno = old_errno;
}
int get_device_info(int fd, u64 devid,
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,
*
* Returns 0 on success, or a negative errno.
*/
-int get_fs_info(char *path, struct btrfs_ioctl_fs_info_args *fi_args,
+int get_fs_info(const char *path, struct btrfs_ioctl_fs_info_args *fi_args,
struct btrfs_ioctl_dev_info_args **di_ret)
{
int fd = -1;
int ret = 0;
int ndevs = 0;
- int i = 0;
+ u64 last_devid = 0;
+ int replacing = 0;
struct btrfs_fs_devices *fs_devices_mnt = NULL;
struct btrfs_ioctl_dev_info_args *di_args;
- char mp[BTRFS_PATH_NAME_MAX + 1];
+ struct btrfs_ioctl_dev_info_args tmp;
+ 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;
/* Ensure it's mounted, then set path to the mountpoint */
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: %m", path);
goto out;
}
ret = check_mounted_where(fd, path, mp, sizeof(mp),
ret = -EIO;
goto out;
}
- devid = btrfs_stack_device_id(&disk_super->dev_item);
-
- fi_args->max_id = devid;
- i = devid;
+ last_devid = btrfs_stack_device_id(&disk_super->dev_item);
+ fi_args->max_id = last_devid;
memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
close(fd);
ret = search_chunk_tree_for_fs_info(fd, fi_args);
if (ret)
goto out;
+
+ /*
+ * search_chunk_tree_for_fs_info() will lacks the devid 0
+ * so manual probe for it here.
+ */
+ ret = get_device_info(fd, 0, &tmp);
+ if (!ret) {
+ fi_args->num_devices++;
+ ndevs++;
+ replacing = 1;
+ if (last_devid == 0)
+ last_devid++;
+ }
}
if (!fi_args->num_devices)
goto out;
}
- for (; i <= fi_args->max_id; ++i) {
- ret = get_device_info(fd, i, &di_args[ndevs]);
+ if (replacing)
+ memcpy(di_args, &tmp, sizeof(tmp));
+ for (; last_devid <= fi_args->max_id; last_devid++) {
+ ret = get_device_info(fd, last_devid, &di_args[ndevs]);
if (ret == -ENODEV)
continue;
if (ret)
return ret;
}
-#define isoctal(c) (((c) & ~7) == '0')
-
-static inline void translate(char *f, char *t)
-{
- while (*f != '\0') {
- if (*f == '\\' &&
- isoctal(f[1]) && isoctal(f[2]) && isoctal(f[3])) {
- *t++ = 64*(f[1] & 7) + 8*(f[2] & 7) + (f[3] & 7);
- f += 4;
- } else
- *t++ = *f++;
- }
- *t = '\0';
- return;
-}
-
-/*
- * Checks if the swap device.
- * Returns 1 if swap device, < 0 on error or 0 if not swap device.
- */
-static int is_swap_device(const char *file)
+int get_fsid(const char *path, u8 *fsid, int silent)
{
- FILE *f;
- struct stat st_buf;
- dev_t dev;
- ino_t ino = 0;
- char tmp[PATH_MAX];
- char buf[PATH_MAX];
- char *cp;
- int ret = 0;
-
- if (stat(file, &st_buf) < 0)
- return -errno;
- if (S_ISBLK(st_buf.st_mode))
- dev = st_buf.st_rdev;
- else if (S_ISREG(st_buf.st_mode)) {
- dev = st_buf.st_dev;
- ino = st_buf.st_ino;
- } else
- return 0;
-
- if ((f = fopen("/proc/swaps", "r")) == NULL)
- return 0;
+ int ret;
+ int fd;
+ struct btrfs_ioctl_fs_info_args args;
- /* skip the first line */
- if (fgets(tmp, sizeof(tmp), f) == NULL)
+ fd = open(path, O_RDONLY);
+ if (fd < 0) {
+ ret = -errno;
+ if (!silent)
+ error("failed to open %s: %s", path,
+ strerror(-ret));
goto out;
+ }
- while (fgets(tmp, sizeof(tmp), f) != NULL) {
- if ((cp = strchr(tmp, ' ')) != NULL)
- *cp = '\0';
- if ((cp = strchr(tmp, '\t')) != NULL)
- *cp = '\0';
- translate(tmp, buf);
- if (stat(buf, &st_buf) != 0)
- continue;
- if (S_ISBLK(st_buf.st_mode)) {
- if (dev == st_buf.st_rdev) {
- ret = 1;
- break;
- }
- } else if (S_ISREG(st_buf.st_mode)) {
- if (dev == st_buf.st_dev && ino == st_buf.st_ino) {
- ret = 1;
- break;
- }
- }
+ ret = ioctl(fd, BTRFS_IOC_FS_INFO, &args);
+ if (ret < 0) {
+ ret = -errno;
+ goto out;
}
-out:
- fclose(f);
+ memcpy(fsid, args.fsid, BTRFS_FSID_SIZE);
+ ret = 0;
+out:
+ if (fd != -1)
+ close(fd);
return ret;
}
-/*
- * Check for existing filesystem or partition table on device.
- * Returns:
- * 1 for existing fs or partition
- * 0 for nothing found
- * -1 for internal error
- */
-static int
-check_overwrite(
- char *device)
+int is_seen_fsid(u8 *fsid, struct seen_fsid *seen_fsid_hash[])
{
- const char *type;
- blkid_probe pr = NULL;
- int ret;
- blkid_loff_t size;
+ u8 hash = fsid[0];
+ int slot = hash % SEEN_FSID_HASH_SIZE;
+ struct seen_fsid *seen = seen_fsid_hash[slot];
- if (!device || !*device)
- return 0;
+ while (seen) {
+ if (memcmp(seen->fsid, fsid, BTRFS_FSID_SIZE) == 0)
+ return 1;
- ret = -1; /* will reset on success of all setup calls */
+ seen = seen->next;
+ }
- pr = blkid_new_probe_from_filename(device);
- if (!pr)
- goto out;
+ return 0;
+}
- size = blkid_probe_get_size(pr);
- if (size < 0)
- goto out;
+int add_seen_fsid(u8 *fsid, struct seen_fsid *seen_fsid_hash[],
+ int fd, DIR *dirstream)
+{
+ u8 hash = fsid[0];
+ int slot = hash % SEEN_FSID_HASH_SIZE;
+ struct seen_fsid *seen = seen_fsid_hash[slot];
+ struct seen_fsid *alloc;
- /* nothing to overwrite on a 0-length device */
- if (size == 0) {
- ret = 0;
- goto out;
- }
+ if (!seen)
+ goto insert;
- ret = blkid_probe_enable_partitions(pr, 1);
- if (ret < 0)
- goto out;
+ while (1) {
+ if (memcmp(seen->fsid, fsid, BTRFS_FSID_SIZE) == 0)
+ return -EEXIST;
- ret = blkid_do_fullprobe(pr);
- if (ret < 0)
- goto out;
+ if (!seen->next)
+ break;
- /*
- * Blkid returns 1 for nothing found and 0 when it finds a signature,
- * but we want the exact opposite, so reverse the return value here.
- *
- * In addition print some useful diagnostics about what actually is
- * on the device.
- */
- if (ret) {
- ret = 0;
- goto out;
+ seen = seen->next;
}
- if (!blkid_probe_lookup_value(pr, "TYPE", &type, NULL)) {
- fprintf(stderr,
- "%s appears to contain an existing "
- "filesystem (%s).\n", device, type);
- } else if (!blkid_probe_lookup_value(pr, "PTTYPE", &type, NULL)) {
- fprintf(stderr,
- "%s appears to contain a partition "
- "table (%s).\n", device, type);
- } else {
- fprintf(stderr,
- "%s appears to contain something weird "
- "according to blkid\n", device);
- }
- ret = 1;
+insert:
+ alloc = malloc(sizeof(*alloc));
+ if (!alloc)
+ return -ENOMEM;
-out:
- if (pr)
- blkid_free_probe(pr);
- if (ret == -1)
- fprintf(stderr,
- "probe of %s failed, cannot detect "
- "existing filesystem.\n", device);
- return ret;
+ alloc->next = NULL;
+ memcpy(alloc->fsid, fsid, BTRFS_FSID_SIZE);
+ alloc->fd = fd;
+ alloc->dirstream = dirstream;
+
+ if (seen)
+ seen->next = alloc;
+ else
+ seen_fsid_hash[slot] = alloc;
+
+ return 0;
+}
+
+void free_seen_fsid(struct seen_fsid *seen_fsid_hash[])
+{
+ int slot;
+ struct seen_fsid *seen;
+ struct seen_fsid *next;
+
+ for (slot = 0; slot < SEEN_FSID_HASH_SIZE; slot++) {
+ seen = seen_fsid_hash[slot];
+ while (seen) {
+ next = seen->next;
+ close_file_or_dir(seen->fd, seen->dirstream);
+ free(seen);
+ seen = next;
+ }
+ seen_fsid_hash[slot] = NULL;
+ }
}
static int group_profile_devs_min(u64 flag)
}
int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
- u64 dev_cnt, int mixed, char *estr)
+ u64 dev_cnt, int mixed, int ssd)
{
- size_t sz = 100;
u64 allowed = 0;
+ u64 profile = metadata_profile | data_profile;
switch (dev_cnt) {
default:
case 2:
allowed |= BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_RAID5;
- break;
case 1:
allowed |= BTRFS_BLOCK_GROUP_DUP;
}
- if (dev_cnt > 1 &&
- ((metadata_profile | data_profile) & BTRFS_BLOCK_GROUP_DUP)) {
- snprintf(estr, sz,
- "DUP is not allowed when FS has multiple devices\n");
- return 1;
+ if (dev_cnt > 1 && profile & BTRFS_BLOCK_GROUP_DUP) {
+ warning("DUP is not recommended on filesystem with multiple devices");
}
if (metadata_profile & ~allowed) {
- snprintf(estr, sz,
- "unable to create FS with metadata profile %s "
+ fprintf(stderr,
+ "ERROR: unable to create FS with metadata profile %s "
"(have %llu devices but %d devices are required)\n",
btrfs_group_profile_str(metadata_profile), dev_cnt,
group_profile_devs_min(metadata_profile));
return 1;
}
if (data_profile & ~allowed) {
- snprintf(estr, sz,
- "unable to create FS with data profile %s "
+ fprintf(stderr,
+ "ERROR: unable to create FS with data profile %s "
"(have %llu devices but %d devices are required)\n",
btrfs_group_profile_str(data_profile), dev_cnt,
group_profile_devs_min(data_profile));
return 1;
}
- if (!mixed && (data_profile & BTRFS_BLOCK_GROUP_DUP)) {
- snprintf(estr, sz,
- "dup for data is allowed only in mixed mode");
- return 1;
+ if (dev_cnt == 3 && profile & BTRFS_BLOCK_GROUP_RAID6) {
+ warning("RAID6 is not recommended on filesystem with 3 devices only");
}
+ if (dev_cnt == 2 && profile & BTRFS_BLOCK_GROUP_RAID5) {
+ warning("RAID5 is not recommended on filesystem with 2 devices only");
+ }
+ 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;
}
-/* Check if disk is suitable for btrfs
- * returns:
- * 1: something is wrong, estr provides the error
- * 0: all is fine
- */
-int test_dev_for_mkfs(char *file, int force_overwrite, char *estr)
+int group_profile_max_safe_loss(u64 flags)
{
- int ret, fd;
- size_t sz = 100;
- struct stat st;
-
- ret = is_swap_device(file);
- if (ret < 0) {
- snprintf(estr, sz, "error checking %s status: %s\n", file,
- strerror(-ret));
- return 1;
- }
- if (ret == 1) {
- snprintf(estr, sz, "%s is a swap device\n", file);
- return 1;
- }
- if (!force_overwrite) {
- if (check_overwrite(file)) {
- snprintf(estr, sz, "Use the -f option to force overwrite.\n");
- return 1;
- }
- }
- ret = check_mounted(file);
- if (ret < 0) {
- snprintf(estr, sz, "error checking %s mount status\n",
- file);
- return 1;
- }
- if (ret == 1) {
- snprintf(estr, sz, "%s is mounted\n", file);
- return 1;
- }
- /* check if the device is busy */
- fd = open(file, O_RDWR|O_EXCL);
- if (fd < 0) {
- snprintf(estr, sz, "unable to open %s: %s\n", file,
- strerror(errno));
- return 1;
- }
- if (fstat(fd, &st)) {
- snprintf(estr, sz, "unable to stat %s: %s\n", file,
- strerror(errno));
- close(fd);
- return 1;
- }
- if (!S_ISBLK(st.st_mode)) {
- fprintf(stderr, "'%s' is not a block device\n", file);
- close(fd);
+ switch (flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
+ case 0: /* single */
+ case BTRFS_BLOCK_GROUP_DUP:
+ case BTRFS_BLOCK_GROUP_RAID0:
+ return 0;
+ case BTRFS_BLOCK_GROUP_RAID1:
+ case BTRFS_BLOCK_GROUP_RAID5:
+ case BTRFS_BLOCK_GROUP_RAID10:
return 1;
+ case BTRFS_BLOCK_GROUP_RAID6:
+ return 2;
+ default:
+ return -1;
}
- close(fd);
- return 0;
}
-int btrfs_scan_lblkid()
+int btrfs_scan_devices(void)
{
int fd = -1;
int ret;
if (btrfs_scan_done)
return 0;
- if (blkid_get_cache(&cache, 0) < 0) {
- printf("ERROR: lblkid cache get failed\n");
+ if (blkid_get_cache(&cache, NULL) < 0) {
+ error("blkid cache get failed");
return 1;
}
blkid_probe_all(cache);
if (!dev)
continue;
/* if we are here its definitely a btrfs disk*/
- strncpy(path, blkid_dev_devname(dev), PATH_MAX);
+ strncpy_null(path, blkid_dev_devname(dev));
fd = open(path, O_RDONLY);
if (fd < 0) {
- printf("ERROR: could not open %s\n", path);
+ error("cannot open %s: %m", path);
continue;
}
ret = btrfs_scan_one_device(fd, path, &tmp_devices,
- &num_devices, BTRFS_SUPER_INFO_OFFSET, 0);
+ &num_devices, BTRFS_SUPER_INFO_OFFSET,
+ SBREAD_DEFAULT);
if (ret) {
- printf("ERROR: could not scan %s\n", path);
+ error("cannot scan %s: %s", path, strerror(-ret));
close (fd);
continue;
}
return 0;
}
-int is_vol_small(char *file)
-{
- int fd = -1;
- int e;
- struct stat st;
- u64 size;
-
- fd = open(file, O_RDONLY);
- if (fd < 0)
- return -errno;
- if (fstat(fd, &st) < 0) {
- e = -errno;
- close(fd);
- return e;
- }
- size = btrfs_device_size(fd, &st);
- if (size == 0) {
- close(fd);
- return -1;
- }
- if (size < BTRFS_MKFS_SMALL_VOLUME_SIZE) {
- close(fd);
- return 1;
- } else {
- close(fd);
- return 0;
- }
-}
-
/*
* This reads a line from the stdin and only returns non-zero if the
* 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;
}
/*
- * For a given:
- * - file or directory return the containing tree root id
- * - subvolume return its own tree id
- * - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
- * undefined and function returns -1
- */
-int lookup_ino_rootid(int fd, u64 *rootid)
-{
- 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) {
- fprintf(stderr, "ERROR: Failed to lookup root id - %s\n",
- strerror(e));
- return ret;
- }
-
- *rootid = args.treeid;
-
- 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
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
+ * 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 result;
}
+/*
+ * Check if the BTRFS_IOC_TREE_SEARCH_V2 ioctl is supported on a given
+ * filesystem, opened at fd
+ */
int btrfs_tree_search2_ioctl_supported(int fd)
{
struct btrfs_ioctl_search_args_v2 *args2;
int args2_size = 1024;
char args2_buf[args2_size];
int ret;
- static int v2_supported = -1;
-
- if (v2_supported != -1)
- return v2_supported;
args2 = (struct btrfs_ioctl_search_args_v2 *)args2_buf;
sk = &(args2->key);
args2->buf_size = args2_size - sizeof(struct btrfs_ioctl_search_args_v2);
ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH_V2, args2);
if (ret == -EOPNOTSUPP)
- v2_supported = 0;
+ return 0;
else if (ret == 0)
- v2_supported = 1;
- else
- return ret;
+ return 1;
+ return ret;
+}
+
+int btrfs_check_nodesize(u32 nodesize, u32 sectorsize, u64 features)
+{
+ if (nodesize < sectorsize) {
+ error("illegal nodesize %u (smaller than %u)",
+ nodesize, sectorsize);
+ return -1;
+ } else if (nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
+ error("illegal nodesize %u (larger than %u)",
+ nodesize, BTRFS_MAX_METADATA_BLOCKSIZE);
+ return -1;
+ } else if (nodesize & (sectorsize - 1)) {
+ error("illegal nodesize %u (not aligned to %u)",
+ nodesize, sectorsize);
+ return -1;
+ } else if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS &&
+ nodesize != sectorsize) {
+ error("illegal nodesize %u (not equal to %u for mixed block group)",
+ 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;
+}
+
+u64 div_factor(u64 num, int factor)
+{
+ if (factor == 10)
+ return num;
+ num *= factor;
+ num /= 10;
+ return num;
+}
+/*
+ * Get the length of the string converted from a u64 number.
+ *
+ * Result is equal to log10(num) + 1, but without the use of math library.
+ */
+int count_digits(u64 num)
+{
+ int ret = 0;
+
+ if (num == 0)
+ return 1;
+ while (num > 0) {
+ ret++;
+ num /= 10;
+ }
+ return ret;
+}
+
+int string_is_numerical(const char *str)
+{
+ if (!str)
+ return 0;
+ if (!(*str >= '0' && *str <= '9'))
+ return 0;
+ while (*str >= '0' && *str <= '9')
+ str++;
+ if (*str != '\0')
+ return 0;
+ return 1;
+}
+
+int prefixcmp(const char *str, const char *prefix)
+{
+ for (; ; str++, prefix++)
+ if (!*prefix)
+ return 0;
+ else if (*str != *prefix)
+ return (unsigned char)*prefix - (unsigned char)*str;
+}
+
+/* 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, "..");
+}
+
+const char *subvol_strip_mountpoint(const char *mnt, const char *full_path)
+{
+ int len = strlen(mnt);
+ if (!len)
+ return full_path;
+
+ if ((strncmp(mnt, full_path, len) != 0) || (full_path[len] != '/')) {
+ error("not on mount point: %s", mnt);
+ exit(1);
+ }
+
+ if (mnt[len - 1] != '/')
+ len += 1;
+
+ return full_path + len;
+}
+
+/* Set the seed manually */
+void init_rand_seed(u64 seed)
+{
+ int i;
+
+ /* only use the last 48 bits */
+ for (i = 0; i < 3; i++) {
+ rand_seed[i] = (unsigned short)(seed ^ (unsigned short)(-1));
+ seed >>= 16;
+ }
+ rand_seed_initlized = 1;
+}
+
+static void __init_seed(void)
+{
+ struct timeval tv;
+ int ret;
+ int fd;
+
+ if(rand_seed_initlized)
+ return;
+ /* Use urandom as primary seed source. */
+ fd = open("/dev/urandom", O_RDONLY);
+ if (fd >= 0) {
+ ret = read(fd, rand_seed, sizeof(rand_seed));
+ close(fd);
+ if (ret < sizeof(rand_seed))
+ goto fallback;
+ } else {
+fallback:
+ /* Use time and pid as fallback seed */
+ warning("failed to read /dev/urandom, use time and pid as random seed");
+ gettimeofday(&tv, 0);
+ rand_seed[0] = getpid() ^ (tv.tv_sec & 0xFFFF);
+ rand_seed[1] = getppid() ^ (tv.tv_usec & 0xFFFF);
+ rand_seed[2] = (tv.tv_sec ^ tv.tv_usec) >> 16;
+ }
+ rand_seed_initlized = 1;
+}
+
+u32 rand_u32(void)
+{
+ __init_seed();
+ /*
+ * Don't use nrand48, its range is [0,2^31) The highest bit will alwasy
+ * be 0. Use jrand48 to include the highest bit.
+ */
+ return (u32)jrand48(rand_seed);
+}
+
+/* Return random number in range [0, upper) */
+unsigned int rand_range(unsigned int upper)
+{
+ __init_seed();
+ /*
+ * Use the full 48bits to mod, which would be more uniformly
+ * distributed
+ */
+ return (unsigned int)(jrand48(rand_seed) % upper);
+}
+
+int rand_int(void)
+{
+ return (int)(rand_u32());
+}
+
+u64 rand_u64(void)
+{
+ u64 ret = 0;
+
+ ret += rand_u32();
+ ret <<= 32;
+ ret += rand_u32();
+ return ret;
+}
+
+u16 rand_u16(void)
+{
+ return (u16)(rand_u32());
+}
+
+u8 rand_u8(void)
+{
+ return (u8)(rand_u32());
+}
+
+void btrfs_config_init(void)
+{
+}
+
+/* Returns total size of main memory in bytes, -1UL if error. */
+unsigned long total_memory(void)
+{
+ struct sysinfo si;
+
+ if (sysinfo(&si) < 0) {
+ error("can't determine memory size");
+ return -1UL;
+ }
+ return si.totalram * si.mem_unit; /* bytes */
+}
+
+void print_device_info(struct btrfs_device *device, char *prefix)
+{
+ if (prefix)
+ printf("%s", prefix);
+ printf("Device: id = %llu, name = %s\n",
+ device->devid, device->name);
+}
+
+void print_all_devices(struct list_head *devices)
+{
+ struct btrfs_device *dev;
- return v2_supported;
+ printf("All Devices:\n");
+ list_for_each_entry(dev, devices, dev_list)
+ print_device_info(dev, "\t");
+ printf("\n");
}