diff options
Diffstat (limited to 'util.c')
| -rw-r--r-- | util.c | 49 |
1 files changed, 49 insertions, 0 deletions
@@ -30,6 +30,7 @@ #include <sys/un.h> #include <sys/resource.h> #include <sys/vfs.h> +#include <sys/mman.h> #include <linux/magic.h> #include <poll.h> #include <ctype.h> @@ -2334,3 +2335,51 @@ void set_hooks(void) set_dlm_hooks(); set_cmap_hooks(); } + +int zero_disk_range(int fd, unsigned long long sector, size_t count) +{ + int ret = 0; + int fd_zero; + void *addr = NULL; + size_t written = 0; + size_t len = count * 512; + ssize_t n; + + fd_zero = open("/dev/zero", O_RDONLY); + if (fd_zero < 0) { + pr_err("Cannot open /dev/zero\n"); + return -1; + } + + if (lseek64(fd, sector * 512, SEEK_SET) < 0) { + ret = -errno; + pr_err("Failed to seek offset for zeroing\n"); + goto out; + } + + addr = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd_zero, 0); + + if (addr == MAP_FAILED) { + ret = -errno; + pr_err("Mapping /dev/zero failed\n"); + goto out; + } + + do { + n = write(fd, addr + written, len - written); + if (n < 0) { + if (errno == EINTR) + continue; + ret = -errno; + pr_err("Zeroing disk range failed\n"); + break; + } + written += n; + } while (written != len); + + munmap(addr, len); + +out: + close(fd_zero); + return ret; +} |