* 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 <linux/kdev_t.h>
#include <limits.h>
#include <blkid/blkid.h>
+#include <sys/vfs.h>
+
#include "kerncompat.h"
#include "radix-tree.h"
#include "ctree.h"
#define BLKDISCARD _IO(0x12,119)
#endif
-static int
-discard_blocks(int fd, u64 start, u64 len)
+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;
+}
+
+
+/*
+ * Discard the given range in one go
+ */
+static int discard_range(int fd, u64 start, u64 len)
{
u64 range[2] = { start, len };
return 0;
}
+/*
+ * Discard blocks in the given range in 1G chunks, the process is interruptible
+ */
+static int discard_blocks(int fd, u64 start, u64 len)
+{
+ while (len > 0) {
+ /* 1G granularity */
+ u64 chunk_size = min_t(u64, len, 1*1024*1024*1024);
+ int ret;
+
+ ret = discard_range(fd, start, chunk_size);
+ if (ret)
+ return ret;
+ len -= chunk_size;
+ start += chunk_size;
+ }
+
+ return 0;
+}
+
static u64 reference_root_table[] = {
[1] = BTRFS_ROOT_TREE_OBJECTID,
[2] = BTRFS_EXTENT_TREE_OBJECTID,
[6] = BTRFS_CSUM_TREE_OBJECTID,
};
-int make_btrfs(int fd, const char *device, const char *label,
+int test_uuid_unique(char *fs_uuid)
+{
+ int unique = 1;
+ blkid_dev_iterate iter = NULL;
+ blkid_dev dev = NULL;
+ blkid_cache cache = NULL;
+
+ if (blkid_get_cache(&cache, 0) < 0) {
+ printf("ERROR: lblkid cache get failed\n");
+ return 1;
+ }
+ blkid_probe_all(cache);
+ iter = blkid_dev_iterate_begin(cache);
+ blkid_dev_set_search(iter, "UUID", fs_uuid);
+
+ while (blkid_dev_next(iter, &dev) == 0) {
+ dev = blkid_verify(cache, dev);
+ if (dev) {
+ unique = 0;
+ break;
+ }
+ }
+
+ blkid_dev_iterate_end(iter);
+ blkid_put_cache(cache);
+
+ return unique;
+}
+
+int make_btrfs(int fd, const char *device, const char *label, char *fs_uuid,
u64 blocks[7], u64 num_bytes, u32 nodesize,
- u32 leafsize, u32 sectorsize, u32 stripesize, u64 features)
+ u32 sectorsize, u32 stripesize, u64 features)
{
struct btrfs_super_block super;
- struct extent_buffer *buf;
+ struct extent_buffer *buf = NULL;
struct btrfs_root_item root_item;
struct btrfs_disk_key disk_key;
struct btrfs_extent_item *extent_item;
memset(&super, 0, sizeof(super));
num_bytes = (num_bytes / sectorsize) * sectorsize;
- uuid_generate(super.fsid);
+ if (fs_uuid) {
+ if (uuid_parse(fs_uuid, super.fsid) != 0) {
+ fprintf(stderr, "could not parse UUID: %s\n", fs_uuid);
+ ret = -EINVAL;
+ goto out;
+ }
+ if (!test_uuid_unique(fs_uuid)) {
+ fprintf(stderr, "non-unique UUID: %s\n", fs_uuid);
+ ret = -EBUSY;
+ goto out;
+ }
+ } else {
+ uuid_generate(super.fsid);
+ }
uuid_generate(super.dev_item.uuid);
uuid_generate(chunk_tree_uuid);
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_bytes_used(&super, 6 * nodesize);
btrfs_set_super_sectorsize(&super, sectorsize);
- btrfs_set_super_leafsize(&super, leafsize);
+ btrfs_set_super_leafsize(&super, nodesize);
btrfs_set_super_nodesize(&super, nodesize);
btrfs_set_super_stripesize(&super, stripesize);
btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
if (label)
strncpy(super.label, label, BTRFS_LABEL_SIZE - 1);
- buf = malloc(sizeof(*buf) + max(sectorsize, leafsize));
+ buf = malloc(sizeof(*buf) + max(sectorsize, nodesize));
/* create the tree of root objects */
- memset(buf->data, 0, leafsize);
- buf->len = leafsize;
+ memset(buf->data, 0, nodesize);
+ buf->len = nodesize;
btrfs_set_header_bytenr(buf, blocks[1]);
btrfs_set_header_nritems(buf, 4);
btrfs_set_header_generation(buf, 1);
write_extent_buffer(buf, super.fsid, btrfs_header_fsid(),
BTRFS_FSID_SIZE);
- write_extent_buffer(buf, chunk_tree_uuid, (unsigned long)
+ write_extent_buffer(buf, chunk_tree_uuid,
btrfs_header_chunk_tree_uuid(buf),
BTRFS_UUID_SIZE);
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_nbytes(inode_item, nodesize);
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_used(&root_item, 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(leafsize) - sizeof(root_item);
+ itemoff = __BTRFS_LEAF_DATA_SIZE(nodesize) - 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);
csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, leafsize, blocks[1]);
- if (ret != leafsize) {
+ ret = pwrite(fd, buf->data, nodesize, blocks[1]);
+ if (ret != nodesize) {
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));
+ memset(buf->data + sizeof(struct btrfs_header), 0,
+ nodesize - sizeof(struct btrfs_header));
nritems = 0;
- itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize);
+ itemoff = __BTRFS_LEAF_DATA_SIZE(nodesize);
for (i = 1; i < 7; i++) {
item_size = sizeof(struct btrfs_extent_item);
if (!skinny_metadata)
} else {
btrfs_set_disk_key_type(&disk_key,
BTRFS_EXTENT_ITEM_KEY);
- btrfs_set_disk_key_offset(&disk_key, leafsize);
+ btrfs_set_disk_key_offset(&disk_key, nodesize);
}
btrfs_set_item_key(buf, &disk_key, nritems);
btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
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 = pwrite(fd, buf->data, nodesize, blocks[2]);
+ if (ret != nodesize) {
ret = (ret < 0 ? -errno : -EIO);
goto out;
}
/* create the chunk tree */
- memset(buf->data+sizeof(struct btrfs_header), 0,
- leafsize-sizeof(struct btrfs_header));
+ memset(buf->data + sizeof(struct btrfs_header), 0,
+ nodesize - sizeof(struct btrfs_header));
nritems = 0;
item_size = sizeof(*dev_item);
- itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - item_size;
+ itemoff = __BTRFS_LEAF_DATA_SIZE(nodesize) - item_size;
/* first device 1 (there is no device 0) */
btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
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 = pwrite(fd, buf->data, nodesize, blocks[3]);
+ if (ret != nodesize) {
ret = (ret < 0 ? -errno : -EIO);
goto out;
}
/* create the device tree */
- memset(buf->data+sizeof(struct btrfs_header), 0,
- leafsize-sizeof(struct btrfs_header));
+ memset(buf->data + sizeof(struct btrfs_header), 0,
+ nodesize - sizeof(struct btrfs_header));
nritems = 0;
- itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) -
+ itemoff = __BTRFS_LEAF_DATA_SIZE(nodesize) -
sizeof(struct btrfs_dev_extent);
btrfs_set_disk_key_objectid(&disk_key, 1);
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 = pwrite(fd, buf->data, nodesize, blocks[4]);
+ if (ret != nodesize) {
ret = (ret < 0 ? -errno : -EIO);
goto out;
}
/* create the FS root */
- memset(buf->data+sizeof(struct btrfs_header), 0,
- leafsize-sizeof(struct btrfs_header));
+ memset(buf->data + sizeof(struct btrfs_header), 0,
+ nodesize - 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 = pwrite(fd, buf->data, nodesize, blocks[5]);
+ if (ret != nodesize) {
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));
+ memset(buf->data + sizeof(struct btrfs_header), 0,
+ nodesize - 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 = pwrite(fd, buf->data, nodesize, blocks[6]);
+ if (ret != nodesize) {
ret = (ret < 0 ? -errno : -EIO);
goto out;
}
return ret;
}
-static int zero_dev_start(int fd)
+#define ZERO_DEV_BYTES (2 * 1024 * 1024)
+
+/* don't write outside the device by clamping the region to the device size */
+static int zero_dev_clamped(int fd, off_t start, ssize_t len, u64 dev_size)
{
- off_t start = 0;
- size_t len = 2 * 1024 * 1024;
+ off_t end = max(start, start + len);
#ifdef __sparc__
- /* don't overwrite the disk labels on sparc */
- start = 1024;
- len -= 1024;
+ /* and don't overwrite the disk labels on sparc */
+ start = max(start, 1024);
+ end = max(end, 1024);
#endif
- return zero_blocks(fd, start, len);
-}
-static int zero_dev_end(int fd, u64 dev_size)
-{
- size_t len = 2 * 1024 * 1024;
- off_t start = dev_size - len;
+ start = min_t(u64, start, dev_size);
+ end = min_t(u64, end, dev_size);
- return zero_blocks(fd, start, len);
+ return zero_blocks(fd, start, end - start);
}
int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
return 0;
}
+static void btrfs_wipe_existing_sb(int fd)
+{
+ const char *off = NULL;
+ size_t len = 0;
+ loff_t offset;
+ char buf[BUFSIZ];
+ int rc = 0;
+ blkid_probe pr = NULL;
+
+ pr = blkid_new_probe();
+ if (!pr)
+ return;
+
+ if (blkid_probe_set_device(pr, fd, 0, 0))
+ goto out;
+
+ rc = blkid_probe_lookup_value(pr, "SBMAGIC_OFFSET", &off, NULL);
+ if (!rc)
+ rc = blkid_probe_lookup_value(pr, "SBMAGIC", NULL, &len);
+
+ if (rc || len == 0 || off == NULL)
+ goto out;
+
+ offset = strtoll(off, NULL, 10);
+ if (len > sizeof(buf))
+ len = sizeof(buf);
+
+ memset(buf, 0, len);
+ rc = pwrite(fd, buf, len, offset);
+ fsync(fd);
+
+out:
+ blkid_free_probe(pr);
+ return;
+}
+
int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
u64 max_block_count, int *mixed, int discard)
{
u64 block_count;
- u64 bytenr;
struct stat st;
int i, ret;
ret = fstat(fd, &st);
if (ret < 0) {
fprintf(stderr, "unable to stat %s\n", file);
- exit(1);
+ return 1;
}
block_count = btrfs_device_size(fd, &st);
if (block_count == 0) {
fprintf(stderr, "unable to find %s size\n", file);
- exit(1);
+ return 1;
}
if (max_block_count)
block_count = min(block_count, max_block_count);
- zero_end = 1;
- if (block_count < 1024 * 1024 * 1024 && !(*mixed)) {
- printf("SMALL VOLUME: forcing mixed metadata/data groups\n");
+ if (block_count < BTRFS_MKFS_SMALL_VOLUME_SIZE && !(*mixed))
*mixed = 1;
- }
if (discard) {
/*
* is not necessary for the mkfs functionality but just an
* optimization.
*/
- if (discard_blocks(fd, 0, 0) == 0) {
- fprintf(stderr, "Performing full device TRIM (%s) ...\n",
+ if (discard_range(fd, 0, 0) == 0) {
+ printf("Performing full device TRIM (%s) ...\n",
pretty_size(block_count));
discard_blocks(fd, 0, block_count);
}
}
- ret = zero_dev_start(fd);
- if (ret) {
- fprintf(stderr, "failed to zero device start %d\n", ret);
- exit(1);
- }
+ ret = zero_dev_clamped(fd, 0, ZERO_DEV_BYTES, block_count);
+ for (i = 0 ; !ret && i < BTRFS_SUPER_MIRROR_MAX; i++)
+ ret = zero_dev_clamped(fd, btrfs_sb_offset(i),
+ BTRFS_SUPER_INFO_SIZE, block_count);
+ if (!ret && zero_end)
+ ret = zero_dev_clamped(fd, block_count - ZERO_DEV_BYTES,
+ ZERO_DEV_BYTES, block_count);
- for (i = 0 ; i < BTRFS_SUPER_MIRROR_MAX; i++) {
- bytenr = btrfs_sb_offset(i);
- if (bytenr >= block_count)
- break;
- zero_blocks(fd, bytenr, BTRFS_SUPER_INFO_SIZE);
+ if (ret < 0) {
+ fprintf(stderr, "ERROR: failed to zero device '%s' - %s\n",
+ file, strerror(-ret));
+ return 1;
}
- if (zero_end) {
- ret = zero_dev_end(fd, block_count);
- if (ret) {
- fprintf(stderr, "failed to zero device end %d\n", ret);
- exit(1);
- }
- }
+ btrfs_wipe_existing_sb(fd);
+
*block_count_ret = block_count;
return 0;
}
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->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);
return ret;
}
+static int is_reg_file(const char *path)
+{
+ struct stat statbuf;
+
+ if (stat(path, &statbuf) < 0)
+ return -errno;
+ return S_ISREG(statbuf.st_mode);
+}
+
+/*
+ * This function checks if the given input parameter is
+ * an uuid or a 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
+ */
+int check_arg_type(const char *input)
+{
+ uuid_t uuid;
+ char path[PATH_MAX];
+
+ if (!input)
+ return -EINVAL;
+
+ if (realpath(input, path)) {
+ if (is_block_device(path) == 1)
+ return BTRFS_ARG_BLKDEV;
+
+ if (is_mount_point(path) == 1)
+ return BTRFS_ARG_MNTPOINT;
+
+ if (is_reg_file(path))
+ return BTRFS_ARG_REG;
+
+ return BTRFS_ARG_UNKNOWN;
+ }
+
+ if (strlen(input) == (BTRFS_UUID_UNPARSED_SIZE - 1) &&
+ !uuid_parse(input, uuid))
+ return BTRFS_ARG_UUID;
+
+ return BTRFS_ARG_UNKNOWN;
+}
+
/*
* Find the mount point for a mounted device.
* On success, returns 0 with mountpoint in *mp.
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)
char real_a[PATH_MAX];
char real_b[PATH_MAX];
- if(!realpath(a, real_a))
- strcpy(real_a, a);
+ if (!realpath(a, real_a))
+ strncpy_null(real_a, a);
if (!realpath(b, real_b))
- strcpy(real_b, 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;
}
}
/*
+ * Resolve a pathname to a device mapper node to /dev/mapper/<name>
+ * Returns NULL on invalid input or malloc failure; Other failures
+ * will be handled by the caller using the input pathame.
+ */
+char *canonicalize_dm_name(const char *ptname)
+{
+ FILE *f;
+ size_t sz;
+ char path[PATH_MAX], name[PATH_MAX], *res = NULL;
+
+ if (!ptname || !*ptname)
+ return NULL;
+
+ snprintf(path, sizeof(path), "/sys/block/%s/dm/name", ptname);
+ if (!(f = fopen(path, "r")))
+ return NULL;
+
+ /* read <name>\n from sysfs */
+ if (fgets(name, sizeof(name), f) && (sz = strlen(name)) > 1) {
+ name[sz - 1] = '\0';
+ snprintf(path, sizeof(path), "/dev/mapper/%s", name);
+
+ if (access(path, F_OK) == 0)
+ res = strdup(path);
+ }
+ fclose(f);
+ return res;
+}
+
+/*
+ * Resolve a pathname to a canonical device node, e.g. /dev/sda1 or
+ * to a device mapper pathname.
+ * Returns NULL on invalid input or malloc failure; Other failures
+ * will be handled by the caller using the input pathame.
+ */
+char *canonicalize_path(const char *path)
+{
+ char *canonical, *p;
+
+ if (!path || !*path)
+ return NULL;
+
+ canonical = realpath(path, NULL);
+ if (!canonical)
+ return strdup(path);
+ p = strrchr(canonical, '/');
+ if (p && strncmp(p, "/dm-", 4) == 0 && isdigit(*(p + 4))) {
+ char *dm = canonicalize_dm_name(p + 1);
+
+ if (dm) {
+ free(canonical);
+ return dm;
+ }
+ }
+ return canonical;
+}
+
+/*
* returns 1 if the device was mounted, < 0 on error or 0 if everything
* is safe to continue.
*/
/* scan the initial device */
ret = btrfs_scan_one_device(fd, file, &fs_devices_mnt,
- &total_devs, BTRFS_SUPER_INFO_OFFSET);
+ &total_devs, BTRFS_SUPER_INFO_OFFSET, 0);
is_btrfs = (ret >= 0);
/* scan other devices */
if (is_btrfs && total_devs > 1) {
- if ((ret = btrfs_scan_for_fsid(!BTRFS_UPDATE_KERNEL)))
+ ret = btrfs_scan_lblkid();
+ if (ret)
return ret;
}
char name[PATH_MAX];
};
-void btrfs_register_one_device(char *fname)
+int btrfs_register_one_device(const char *fname)
{
struct btrfs_ioctl_vol_args args;
int fd;
int ret;
int e;
- fd = open("/dev/btrfs-control", O_RDONLY);
+ 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));
- return;
+ return -errno;
}
strncpy(args.name, fname, BTRFS_PATH_NAME_MAX);
args.name[BTRFS_PATH_NAME_MAX-1] = 0;
ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
e = errno;
- if(ret<0){
+ if (ret < 0) {
fprintf(stderr, "ERROR: device scan failed '%s' - %s\n",
fname, strerror(e));
+ ret = -e;
}
close(fd);
+ return ret;
}
-int btrfs_scan_one_dir(char *dirname, int run_ioctl)
+/*
+ * Register all devices in the fs_uuid list created in the user
+ * space. Ensure btrfs_scan_lblkid() is called before this func.
+ */
+int btrfs_register_all_devices(void)
{
- DIR *dirp = NULL;
- struct dirent *dirent;
- struct pending_dir *pending;
- struct stat st;
- int ret;
- int fd;
- int dirname_len;
- char *fullpath;
- struct list_head pending_list;
- struct btrfs_fs_devices *tmp_devices;
- u64 num_devices;
-
- INIT_LIST_HEAD(&pending_list);
-
- pending = malloc(sizeof(*pending));
- if (!pending)
- return -ENOMEM;
- strcpy(pending->name, dirname);
-
-again:
- dirname_len = strlen(pending->name);
- fullpath = malloc(PATH_MAX);
- dirname = pending->name;
-
- if (!fullpath) {
- ret = -ENOMEM;
- goto fail;
- }
- dirp = opendir(dirname);
- if (!dirp) {
- fprintf(stderr, "Unable to open %s for scanning\n", dirname);
- ret = -ENOENT;
- goto fail;
- }
- while(1) {
- dirent = readdir(dirp);
- if (!dirent)
- break;
- if (dirent->d_name[0] == '.')
- continue;
- if (dirname_len + strlen(dirent->d_name) + 2 > PATH_MAX) {
- ret = -EFAULT;
- goto fail;
- }
- snprintf(fullpath, PATH_MAX, "%s/%s", dirname, dirent->d_name);
- ret = lstat(fullpath, &st);
- if (ret < 0) {
- fprintf(stderr, "failed to stat %s\n", fullpath);
- continue;
- }
- if (S_ISLNK(st.st_mode))
- continue;
- if (S_ISDIR(st.st_mode)) {
- struct pending_dir *next = malloc(sizeof(*next));
- if (!next) {
- ret = -ENOMEM;
- goto fail;
+ int err;
+ struct btrfs_fs_devices *fs_devices;
+ struct btrfs_device *device;
+ struct list_head *all_uuids;
+
+ all_uuids = btrfs_scanned_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) {
+ err = btrfs_register_one_device(device->name);
+ if (err < 0)
+ return err;
+ if (err > 0)
+ return -err;
}
- strcpy(next->name, fullpath);
- list_add_tail(&next->list, &pending_list);
- }
- if (!S_ISBLK(st.st_mode)) {
- continue;
}
- fd = open(fullpath, O_RDONLY);
- if (fd < 0) {
- /* ignore the following errors:
- ENXIO (device don't exists)
- ENOMEDIUM (No medium found ->
- like a cd tray empty)
- */
- if(errno != ENXIO && errno != ENOMEDIUM)
- fprintf(stderr, "failed to read %s: %s\n",
- fullpath, strerror(errno));
- continue;
- }
- ret = btrfs_scan_one_device(fd, fullpath, &tmp_devices,
- &num_devices,
- BTRFS_SUPER_INFO_OFFSET);
- if (ret == 0 && run_ioctl > 0) {
- btrfs_register_one_device(fullpath);
- }
- close(fd);
- }
- if (!list_empty(&pending_list)) {
- free(pending);
- pending = list_entry(pending_list.next, struct pending_dir,
- list);
- free(fullpath);
- list_del(&pending->list);
- closedir(dirp);
- dirp = NULL;
- goto again;
}
- ret = 0;
-fail:
- free(pending);
- free(fullpath);
- while (!list_empty(&pending_list)) {
- pending = list_entry(pending_list.next, struct pending_dir,
- list);
- list_del(&pending->list);
- free(pending);
- }
- if (dirp)
- closedir(dirp);
- return ret;
-}
-
-int btrfs_scan_for_fsid(int run_ioctls)
-{
- int ret;
-
- ret = scan_for_btrfs(BTRFS_SCAN_PROC, run_ioctls);
- if (ret)
- ret = scan_for_btrfs(BTRFS_SCAN_DEV, run_ioctls);
- return ret;
+ return 0;
}
int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
return ret;
}
-static char *size_strs[] = { "", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
-int pretty_size_snprintf(u64 size, char *str, size_t str_bytes)
+static const char* unit_suffix_binary[] =
+ { "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
+static const char* unit_suffix_decimal[] =
+ { "B", "kB", "MB", "GB", "TB", "PB", "EB"};
+
+int pretty_size_snprintf(u64 size, char *str, size_t str_size, unsigned unit_mode)
{
- int num_divs = 0;
+ int num_divs;
float fraction;
+ u64 base = 0;
+ int mult = 0;
+ const char** suffix = NULL;
+ u64 last_size;
- if (str_bytes == 0)
+ if (str_size == 0)
return 0;
- if( size < 1024 ){
- fraction = size;
- num_divs = 0;
- } else {
- u64 last_size = size;
- num_divs = 0;
- while(size >= 1024){
+ if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_RAW) {
+ snprintf(str, str_size, "%llu", size);
+ return 0;
+ }
+
+ if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_BINARY) {
+ base = 1024;
+ mult = 1024;
+ suffix = unit_suffix_binary;
+ } else if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_DECIMAL) {
+ base = 1000;
+ mult = 1000;
+ suffix = unit_suffix_decimal;
+ }
+
+ /* Unknown mode */
+ if (!base) {
+ fprintf(stderr, "INTERNAL ERROR: unknown unit base, mode %d\n",
+ unit_mode);
+ assert(0);
+ return -1;
+ }
+
+ num_divs = 0;
+ last_size = size;
+ switch (unit_mode & UNITS_MODE_MASK) {
+ case UNITS_TBYTES: base *= mult; num_divs++;
+ case UNITS_GBYTES: base *= mult; num_divs++;
+ case UNITS_MBYTES: base *= mult; num_divs++;
+ case UNITS_KBYTES: num_divs++;
+ break;
+ case UNITS_BYTES:
+ base = 1;
+ num_divs = 0;
+ break;
+ default:
+ while (size >= mult) {
last_size = size;
- size /= 1024;
- num_divs ++;
+ size /= mult;
+ num_divs++;
}
+ }
- if (num_divs >= ARRAY_SIZE(size_strs)) {
- str[0] = '\0';
- return -1;
- }
- fraction = (float)last_size / 1024;
+ if (num_divs >= ARRAY_SIZE(unit_suffix_binary)) {
+ str[0] = '\0';
+ printf("INTERNAL ERROR: unsupported unit suffix, index %d\n",
+ num_divs);
+ assert(0);
+ return -1;
}
- return snprintf(str, str_bytes, "%.2f%s", fraction,
- size_strs[num_divs]);
+ fraction = (float)last_size / base;
+
+ return snprintf(str, str_size, "%.2f%s", fraction, suffix[num_divs]);
}
/*
fd = open(mount_path, O_RDONLY | O_NOATIME);
if (fd < 0) {
- fprintf(stderr, "ERROR: unable access to '%s'\n", mount_path);
+ fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
return -1;
}
fd = open(mount_path, O_RDONLY | O_NOATIME);
if (fd < 0) {
- fprintf(stderr, "ERROR: unable access to '%s'\n", mount_path);
+ fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
return -1;
}
{
int ret;
- if (is_existing_blk_or_reg_file(btrfs_dev))
- ret = get_label_unmounted(btrfs_dev, label);
- else
+ ret = is_existing_blk_or_reg_file(btrfs_dev);
+ if (!ret)
ret = get_label_mounted(btrfs_dev, label);
+ else if (ret > 0)
+ ret = get_label_unmounted(btrfs_dev, label);
return ret;
}
int set_label(const char *btrfs_dev, const char *label)
{
+ int ret;
+
if (check_label(label))
return -1;
- return is_existing_blk_or_reg_file(btrfs_dev) ?
- set_label_unmounted(btrfs_dev, label) :
- set_label_mounted(btrfs_dev, label);
+ ret = is_existing_blk_or_reg_file(btrfs_dev);
+ if (!ret)
+ ret = set_label_mounted(btrfs_dev, label);
+ else if (ret > 0)
+ ret = set_label_unmounted(btrfs_dev, label);
+
+ return ret;
}
int btrfs_scan_block_devices(int run_ioctl)
strcpy(fullpath,"/dev/");
while(fgets(buf, 1023, proc_partitions)) {
- i = sscanf(buf," %*d %*d %*d %99s", fullpath+5);
+ 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
}
ret = btrfs_scan_one_device(fd, fullpath, &tmp_devices,
&num_devices,
- BTRFS_SUPER_INFO_OFFSET);
+ BTRFS_SUPER_INFO_OFFSET, 0);
if (ret == 0 && run_ioctl > 0) {
btrfs_register_one_device(fullpath);
}
return 0;
}
-u64 parse_size(char *s)
+/*
+ * 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
+ */
+static int fls64(u64 x)
{
int i;
+
+ for (i = 0; i <64; i++)
+ if (x << i & (1ULL << 63))
+ return 64 - i;
+ return 64 - i;
+}
+
+u64 parse_size(char *s)
+{
char c;
+ char *endptr;
u64 mult = 1;
+ u64 ret;
- for (i = 0; s && s[i] && isdigit(s[i]); i++) ;
- if (!i) {
- fprintf(stderr, "ERROR: size value is empty\n");
- exit(50);
+ if (!s) {
+ fprintf(stderr, "ERROR: Size value is empty\n");
+ exit(1);
}
-
- if (s[i]) {
- c = tolower(s[i]);
+ if (s[0] == '-') {
+ fprintf(stderr,
+ "ERROR: Size value '%s' is less equal than 0\n", s);
+ exit(1);
+ }
+ ret = strtoull(s, &endptr, 10);
+ if (endptr == s) {
+ fprintf(stderr, "ERROR: Size value '%s' is invalid\n", s);
+ exit(1);
+ }
+ if (endptr[0] && endptr[1]) {
+ fprintf(stderr, "ERROR: Illegal suffix contains character '%c' in wrong position\n",
+ endptr[1]);
+ exit(1);
+ }
+ /*
+ * strtoll returns LLONG_MAX when overflow, if this happens,
+ * need to call strtoull to get the real size
+ */
+ if (errno == ERANGE && ret == ULLONG_MAX) {
+ fprintf(stderr,
+ "ERROR: Size value '%s' is too large for u64\n", s);
+ exit(1);
+ }
+ if (endptr[0]) {
+ c = tolower(endptr[0]);
switch (c) {
case 'e':
mult *= 1024;
case 'b':
break;
default:
- fprintf(stderr, "ERROR: Unknown size descriptor "
- "'%c'\n", c);
+ fprintf(stderr, "ERROR: Unknown size descriptor '%c'\n",
+ c);
exit(1);
}
}
- if (s[i] && s[i+1]) {
- fprintf(stderr, "ERROR: Illegal suffix contains "
- "character '%c' in wrong position\n",
- s[i+1]);
- exit(51);
+ /* Check whether ret * mult overflow */
+ if (fls64(ret) + fls64(mult) - 1 > 64) {
+ fprintf(stderr,
+ "ERROR: Size value '%s' is too large for u64\n", s);
+ exit(1);
}
- return strtoull(s, NULL, 10) * mult;
+ ret *= mult;
+ return ret;
}
-int open_file_or_dir(const char *fname, DIR **dirstream)
+u64 parse_qgroupid(const char *p)
+{
+ char *s = strchr(p, '/');
+ const char *ptr_src_end = p + strlen(p);
+ char *ptr_parse_end = NULL;
+ 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 */
+ ret = __is_subvol(p);
+ if (ret < 0 || !ret)
+ goto err;
+ fd = open(p, O_RDONLY);
+ if (fd < 0)
+ goto err;
+ ret = lookup_ino_rootid(fd, &id);
+ close(fd);
+ if (ret < 0)
+ goto err;
+ return id;
+
+err:
+ fprintf(stderr, "ERROR: invalid qgroupid or subvolume path: %s\n", p);
+ exit(-1);
+}
+
+int open_file_or_dir3(const char *fname, DIR **dirstream, int open_flags)
{
int ret;
struct stat st;
if (S_ISDIR(st.st_mode)) {
*dirstream = opendir(fname);
if (!*dirstream)
- return -2;
+ return -1;
fd = dirfd(*dirstream);
+ } else if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
+ fd = open(fname, open_flags);
} else {
- fd = open(fname, O_RDWR);
+ /*
+ * we set this on purpose, in case the caller output
+ * strerror(errno) as success
+ */
+ errno = EINVAL;
+ return -1;
}
if (fd < 0) {
- fd = -3;
+ fd = -1;
if (*dirstream)
closedir(*dirstream);
}
return fd;
}
+int open_file_or_dir(const char *fname, DIR **dirstream)
+{
+ return open_file_or_dir3(fname, dirstream, O_RDWR);
+}
+
void close_file_or_dir(int fd, DIR *dirstream)
{
if (dirstream)
close(fd);
}
-static int get_device_info(int fd, u64 devid,
+int get_device_info(int fd, u64 devid,
struct btrfs_ioctl_dev_info_args *di_args)
{
int ret;
return ret ? -errno : 0;
}
+static u64 find_max_device_id(struct btrfs_ioctl_search_args *search_args,
+ int nr_items)
+{
+ struct btrfs_dev_item *dev_item;
+ char *buf = search_args->buf;
+
+ buf += (nr_items - 1) * (sizeof(struct btrfs_ioctl_search_header)
+ + sizeof(struct btrfs_dev_item));
+ buf += sizeof(struct btrfs_ioctl_search_header);
+
+ dev_item = (struct btrfs_dev_item *)buf;
+
+ return btrfs_stack_device_id(dev_item);
+}
+
+static int search_chunk_tree_for_fs_info(int fd,
+ struct btrfs_ioctl_fs_info_args *fi_args)
+{
+ int ret;
+ int max_items;
+ u64 start_devid = 1;
+ struct btrfs_ioctl_search_args search_args;
+ struct btrfs_ioctl_search_key *search_key = &search_args.key;
+
+ fi_args->num_devices = 0;
+
+ max_items = BTRFS_SEARCH_ARGS_BUFSIZE
+ / (sizeof(struct btrfs_ioctl_search_header)
+ + sizeof(struct btrfs_dev_item));
+
+ search_key->tree_id = BTRFS_CHUNK_TREE_OBJECTID;
+ search_key->min_objectid = BTRFS_DEV_ITEMS_OBJECTID;
+ search_key->max_objectid = BTRFS_DEV_ITEMS_OBJECTID;
+ search_key->min_type = BTRFS_DEV_ITEM_KEY;
+ search_key->max_type = BTRFS_DEV_ITEM_KEY;
+ search_key->min_transid = 0;
+ search_key->max_transid = (u64)-1;
+ search_key->nr_items = max_items;
+ search_key->max_offset = (u64)-1;
+
+again:
+ search_key->min_offset = start_devid;
+
+ ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &search_args);
+ if (ret < 0)
+ return -errno;
+
+ fi_args->num_devices += (u64)search_key->nr_items;
+
+ if (search_key->nr_items == max_items) {
+ start_devid = find_max_device_id(&search_args,
+ search_key->nr_items) + 1;
+ goto again;
+ }
+
+ /* get the lastest max_id to stay consistent with the num_devices */
+ if (search_key->nr_items == 0)
+ /*
+ * last tree_search returns an empty buf, use the devid of
+ * the last dev_item of the previous tree_search
+ */
+ fi_args->max_id = start_devid - 1;
+ else
+ fi_args->max_id = find_max_device_id(&search_args,
+ search_key->nr_items);
+
+ return 0;
+}
+
/*
* For a given path, fill in the ioctl fs_ and info_ args.
* If the path is a btrfs mountpoint, fill info for all devices.
int fd = -1;
int ret = 0;
int ndevs = 0;
- int i = 1;
+ int i = 0;
+ int replacing = 0;
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];
DIR *dirstream = NULL;
memset(fi_args, 0, sizeof(*fi_args));
if (is_block_device(path)) {
+ struct btrfs_super_block *disk_super;
+ char buf[BTRFS_SUPER_INFO_SIZE];
+ u64 devid;
+
/* Ensure it's mounted, then set path to the mountpoint */
fd = open(path, O_RDONLY);
if (fd < 0) {
path = mp;
/* Only fill in this one device */
fi_args->num_devices = 1;
- fi_args->max_id = fs_devices_mnt->latest_devid;
- i = fs_devices_mnt->latest_devid;
+
+ disk_super = (struct btrfs_super_block *)buf;
+ ret = btrfs_read_dev_super(fd, disk_super,
+ BTRFS_SUPER_INFO_OFFSET, 0);
+ if (ret < 0) {
+ ret = -EIO;
+ goto out;
+ }
+ devid = btrfs_stack_device_id(&disk_super->dev_item);
+
+ fi_args->max_id = devid;
+ i = devid;
+
memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
close(fd);
}
ret = -errno;
goto out;
}
+
+ /*
+ * The fs_args->num_devices does not include seed devices
+ */
+ 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 (i == 0)
+ i++;
+ }
}
if (!fi_args->num_devices)
goto out;
- di_args = *di_ret = malloc(fi_args->num_devices * sizeof(*di_args));
+ di_args = *di_ret = malloc((fi_args->num_devices) * sizeof(*di_args));
if (!di_args) {
ret = -errno;
goto out;
}
+ if (replacing)
+ memcpy(di_args, &tmp, sizeof(tmp));
for (; i <= fi_args->max_id; ++i) {
- BUG_ON(ndevs >= fi_args->num_devices);
ret = get_device_info(fd, i, &di_args[ndevs]);
if (ret == -ENODEV)
continue;
ndevs++;
}
- BUG_ON(ndevs == 0);
- ret = 0;
+ /*
+ * only when the only dev we wanted to find is not there then
+ * let any error be returned
+ */
+ if (fi_args->num_devices != 1) {
+ BUG_ON(ndevs == 0);
+ ret = 0;
+ }
+
out:
close_file_or_dir(fd, dirstream);
return ret;
return ret;
}
+static int group_profile_devs_min(u64 flag)
+{
+ switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
+ case 0: /* single */
+ case BTRFS_BLOCK_GROUP_DUP:
+ return 1;
+ case BTRFS_BLOCK_GROUP_RAID0:
+ case BTRFS_BLOCK_GROUP_RAID1:
+ case BTRFS_BLOCK_GROUP_RAID5:
+ return 2;
+ case BTRFS_BLOCK_GROUP_RAID6:
+ return 3;
+ case BTRFS_BLOCK_GROUP_RAID10:
+ return 4;
+ default:
+ return -1;
+ }
+}
+
int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
u64 dev_cnt, int mixed, char *estr)
{
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 (metadata_profile & ~allowed) {
- snprintf(estr, sz, "unable to create FS with metadata "
- "profile %llu (have %llu devices)\n",
- metadata_profile, dev_cnt);
+ snprintf(estr, sz,
+ "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 %llu (have %llu devices)\n",
- metadata_profile, dev_cnt);
+ snprintf(estr, sz,
+ "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;
}
return 0;
}
-static int test_skip_this_disk(char *path)
-{
- int fd;
-
- /*
- * this will eliminate disks which are mounted (btrfs)
- * and non-dm disk path when dm is enabled
- */
- fd = open(path, O_RDWR|O_EXCL);
- if (fd < 0)
- return 1;
- close(fd);
- return 0;
-}
-
-int btrfs_scan_lblkid(int update_kernel)
+int btrfs_scan_lblkid()
{
int fd = -1;
int ret;
blkid_cache cache = NULL;
char path[PATH_MAX];
+ if (btrfs_scan_done)
+ return 0;
+
if (blkid_get_cache(&cache, 0) < 0) {
printf("ERROR: lblkid cache get failed\n");
return 1;
if (!dev)
continue;
/* if we are here its definitely a btrfs disk*/
- strncpy(path, blkid_dev_devname(dev), PATH_MAX);
- if (test_skip_this_disk(path))
- continue;
+ strncpy_null(path, blkid_dev_devname(dev));
fd = open(path, O_RDONLY);
if (fd < 0) {
continue;
}
ret = btrfs_scan_one_device(fd, path, &tmp_devices,
- &num_devices, BTRFS_SUPER_INFO_OFFSET);
+ &num_devices, BTRFS_SUPER_INFO_OFFSET, 0);
if (ret) {
printf("ERROR: could not scan %s\n", path);
close (fd);
}
close(fd);
- if (update_kernel)
- btrfs_register_one_device(path);
}
blkid_dev_iterate_end(iter);
- return 0;
-}
+ blkid_put_cache(cache);
-/*
- * scans devs for the btrfs
-*/
-int scan_for_btrfs(int where, int update_kernel)
-{
- int ret = 0;
+ btrfs_scan_done = 1;
- switch (where) {
- case BTRFS_SCAN_PROC:
- ret = btrfs_scan_block_devices(update_kernel);
- break;
- case BTRFS_SCAN_DEV:
- ret = btrfs_scan_one_dir("/dev", update_kernel);
- break;
- case BTRFS_SCAN_LBLKID:
- ret = btrfs_scan_lblkid(update_kernel);
- break;
- }
- return ret;
+ return 0;
}
int is_vol_small(char *file)
close(fd);
return -1;
}
- if (size < 1024 * 1024 * 1024) {
+ if (size < BTRFS_MKFS_SMALL_VOLUME_SIZE) {
close(fd);
return 1;
} else {
/*
* For a given:
* - file or directory return the containing tree root id
- * - subvolume return it's own tree id
+ * - subvolume return its own tree id
* - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
* undefined and function returns -1
*/
return 0;
}
+
+/*
+ * return 0 if a btrfs mount point is found
+ * return 1 if a mount point is found but not btrfs
+ * return <0 if something goes wrong
+ */
+int find_mount_root(const char *path, char **mount_root)
+{
+ FILE *mnttab;
+ int fd;
+ struct mntent *ent;
+ int len;
+ int ret;
+ int not_btrfs = 1;
+ int longest_matchlen = 0;
+ char *longest_match = NULL;
+
+ fd = open(path, O_RDONLY | O_NOATIME);
+ if (fd < 0)
+ return -errno;
+ close(fd);
+
+ mnttab = setmntent("/proc/self/mounts", "r");
+ if (!mnttab)
+ return -errno;
+
+ while ((ent = getmntent(mnttab))) {
+ len = strlen(ent->mnt_dir);
+ if (strncmp(ent->mnt_dir, path, len) == 0) {
+ /* match found and use the latest match */
+ if (longest_matchlen <= len) {
+ free(longest_match);
+ longest_matchlen = len;
+ longest_match = strdup(ent->mnt_dir);
+ not_btrfs = strcmp(ent->mnt_type, "btrfs");
+ }
+ }
+ }
+ endmntent(mnttab);
+
+ if (!longest_match)
+ return -ENOENT;
+ if (not_btrfs) {
+ free(longest_match);
+ return 1;
+ }
+
+ ret = 0;
+ *mount_root = realpath(longest_match, NULL);
+ if (!*mount_root)
+ ret = -errno;
+
+ free(longest_match);
+ return ret;
+}
+
+int test_minimum_size(const char *file, u32 nodesize)
+{
+ 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(nodesize)) {
+ close(fd);
+ return 1;
+ }
+ close(fd);
+ return 0;
+}
+
+/*
+ * test if name is a correct subvolume name
+ * this function return
+ * 0-> name is not a correct subvolume name
+ * 1-> name is a correct subvolume name
+ */
+int test_issubvolname(const char *name)
+{
+ return name[0] != '\0' && !strchr(name, '/') &&
+ strcmp(name, ".") && strcmp(name, "..");
+}
+
+/*
+ * test if path is a directory
+ * this function return
+ * 0-> path exists but it is not a directory
+ * 1-> path exists and it is a directory
+ * -1 -> path is unaccessible
+ */
+int test_isdir(const char *path)
+{
+ struct stat st;
+ int ret;
+
+ ret = stat(path, &st);
+ if(ret < 0 )
+ return -1;
+
+ return S_ISDIR(st.st_mode);
+}
+
+void units_set_mode(unsigned *units, unsigned mode)
+{
+ unsigned base = *units & UNITS_MODE_MASK;
+
+ *units = base | mode;
+}
+
+void units_set_base(unsigned *units, unsigned base)
+{
+ unsigned mode = *units & ~UNITS_MODE_MASK;
+
+ *units = base | mode;
+}
+
+int find_next_key(struct btrfs_path *path, struct btrfs_key *key)
+{
+ int level;
+
+ for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
+ if (!path->nodes[level])
+ break;
+ if (path->slots[level] + 1 >=
+ btrfs_header_nritems(path->nodes[level]))
+ continue;
+ if (level == 0)
+ btrfs_item_key_to_cpu(path->nodes[level], key,
+ path->slots[level] + 1);
+ else
+ btrfs_node_key_to_cpu(path->nodes[level], key,
+ path->slots[level] + 1);
+ return 0;
+ }
+ return 1;
+}
+
+char* btrfs_group_type_str(u64 flag)
+{
+ u64 mask = BTRFS_BLOCK_GROUP_TYPE_MASK |
+ BTRFS_SPACE_INFO_GLOBAL_RSV;
+
+ switch (flag & mask) {
+ case BTRFS_BLOCK_GROUP_DATA:
+ return "Data";
+ case BTRFS_BLOCK_GROUP_SYSTEM:
+ return "System";
+ case BTRFS_BLOCK_GROUP_METADATA:
+ return "Metadata";
+ case BTRFS_BLOCK_GROUP_DATA|BTRFS_BLOCK_GROUP_METADATA:
+ return "Data+Metadata";
+ case BTRFS_SPACE_INFO_GLOBAL_RSV:
+ return "GlobalReserve";
+ default:
+ return "unknown";
+ }
+}
+
+char* btrfs_group_profile_str(u64 flag)
+{
+ switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
+ case 0:
+ return "single";
+ case BTRFS_BLOCK_GROUP_RAID0:
+ return "RAID0";
+ case BTRFS_BLOCK_GROUP_RAID1:
+ return "RAID1";
+ case BTRFS_BLOCK_GROUP_RAID5:
+ return "RAID5";
+ case BTRFS_BLOCK_GROUP_RAID6:
+ return "RAID6";
+ case BTRFS_BLOCK_GROUP_DUP:
+ return "DUP";
+ case BTRFS_BLOCK_GROUP_RAID10:
+ return "RAID10";
+ default:
+ return "unknown";
+ }
+}
+
+u64 disk_size(char *path)
+{
+ struct statfs sfs;
+
+ if (statfs(path, &sfs) < 0)
+ return 0;
+ else
+ return sfs.f_bsize * sfs.f_blocks;
+}
+
+u64 get_partition_size(char *dev)
+{
+ u64 result;
+ int fd = open(dev, O_RDONLY);
+
+ if (fd < 0)
+ return 0;
+ if (ioctl(fd, BLKGETSIZE64, &result) < 0) {
+ close(fd);
+ return 0;
+ }
+ close(fd);
+
+ return result;
+}
+
+int btrfs_tree_search2_ioctl_supported(int fd)
+{
+ struct btrfs_ioctl_search_args_v2 *args2;
+ struct btrfs_ioctl_search_key *sk;
+ 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);
+
+ /*
+ * Search for the extent tree item in the root tree.
+ */
+ sk->tree_id = BTRFS_ROOT_TREE_OBJECTID;
+ sk->min_objectid = BTRFS_EXTENT_TREE_OBJECTID;
+ sk->max_objectid = BTRFS_EXTENT_TREE_OBJECTID;
+ sk->min_type = BTRFS_ROOT_ITEM_KEY;
+ sk->max_type = BTRFS_ROOT_ITEM_KEY;
+ sk->min_offset = 0;
+ sk->max_offset = (u64)-1;
+ sk->min_transid = 0;
+ sk->max_transid = (u64)-1;
+ sk->nr_items = 1;
+ 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;
+ else if (ret == 0)
+ v2_supported = 1;
+ else
+ return ret;
+
+ return v2_supported;
+}
+
+int btrfs_check_nodesize(u32 nodesize, u32 sectorsize)
+{
+ if (nodesize < sectorsize) {
+ fprintf(stderr,
+ "ERROR: Illegal nodesize %u (smaller than %u)\n",
+ nodesize, sectorsize);
+ return -1;
+ } else if (nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
+ fprintf(stderr,
+ "ERROR: Illegal nodesize %u (larger than %u)\n",
+ nodesize, BTRFS_MAX_METADATA_BLOCKSIZE);
+ return -1;
+ } else if (nodesize & (sectorsize - 1)) {
+ fprintf(stderr,
+ "ERROR: Illegal nodesize %u (not aligned to %u)\n",
+ nodesize, sectorsize);
+ return -1;
+ }
+ return 0;
+}
projects / platform / upstream / btrfs-progs.git / blobdiff