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)
-{
- 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;
-
- /* skip the first line */
- if (fgets(tmp, sizeof(tmp), f) == NULL)
- 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;
- }
- }
- }
-
-out:
- fclose(f);
-
- 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(const char *device)
-{
- const char *type;
- blkid_probe pr = NULL;
- int ret;
- blkid_loff_t size;
-
- if (!device || !*device)
- return 0;
-
- ret = -1; /* will reset on success of all setup calls */
-
- pr = blkid_new_probe_from_filename(device);
- if (!pr)
- goto out;
-
- size = blkid_probe_get_size(pr);
- if (size < 0)
- goto out;
-
- /* nothing to overwrite on a 0-length device */
- if (size == 0) {
- ret = 0;
- goto out;
- }
-
- ret = blkid_probe_enable_partitions(pr, 1);
- if (ret < 0)
- goto out;
-
- ret = blkid_do_fullprobe(pr);
- if (ret < 0)
- goto out;
-
- /*
- * 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;
- }
-
- 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;
-
-out:
- if (pr)
- blkid_free_probe(pr);
- if (ret == -1)
- fprintf(stderr,
- "probe of %s failed, cannot detect "
- "existing filesystem.\n", device);
- return ret;
-}
-
static int group_profile_devs_min(u64 flag)
{
switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
}
}
-u64 btrfs_min_dev_size(u32 nodesize)
-{
- return 2 * (BTRFS_MKFS_SYSTEM_GROUP_SIZE +
- btrfs_min_global_blk_rsv_size(nodesize));
-}
-
-/*
- * Btrfs minimum size calculation is complicated, it should include at least:
- * 1. system group size
- * 2. minimum global block reserve
- * 3. metadata used at mkfs
- * 4. space reservation to create uuid for first mount.
- * Also, raid factor should also be taken into consideration.
- * To avoid the overkill calculation, (system group + global block rsv) * 2
- * for *EACH* device should be good enough.
- */
-u64 btrfs_min_global_blk_rsv_size(u32 nodesize)
-{
- return (u64)nodesize << 10;
-}
-
-/*
- * Check if a device is suitable for btrfs
- * returns:
- * 1: something is wrong, an error is printed
- * 0: all is fine
- */
-int test_dev_for_mkfs(const char *file, int force_overwrite)
-{
- int ret, fd;
- struct stat st;
-
- ret = is_swap_device(file);
- if (ret < 0) {
- error("checking status of %s: %s", file, strerror(-ret));
- return 1;
- }
- if (ret == 1) {
- error("%s is a swap device", file);
- return 1;
- }
- if (!force_overwrite) {
- if (check_overwrite(file)) {
- error("use the -f option to force overwrite of %s",
- file);
- return 1;
- }
- }
- ret = check_mounted(file);
- if (ret < 0) {
- error("cannot check mount status of %s: %s", file,
- strerror(-ret));
- return 1;
- }
- if (ret == 1) {
- error("%s is mounted", file);
- return 1;
- }
- /* check if the device is busy */
- fd = open(file, O_RDWR|O_EXCL);
- if (fd < 0) {
- error("unable to open %s: %s", file, strerror(errno));
- return 1;
- }
- if (fstat(fd, &st)) {
- error("unable to stat %s: %s", file, strerror(errno));
- close(fd);
- return 1;
- }
- if (!S_ISBLK(st.st_mode)) {
- error("%s is not a block device", file);
- close(fd);
- return 1;
- }
- close(fd);
- return 0;
-}
-
int btrfs_scan_devices(void)
{
int fd = -1;
return 0;
}
-int is_vol_small(const 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
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 path is a directory
* Returns:
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 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
return ret;
}
+/* Set the seed manually */
void init_rand_seed(u64 seed)
{
int i;
return (u32)jrand48(rand_seed);
}
+/* Return random number in range [0, upper) */
unsigned int rand_range(unsigned int upper)
{
__init_seed();
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)
{
}
projects / platform / upstream / btrfs-progs.git / blobdiff