mirror of
https://gitlab.com/cryptsetup/cryptsetup.git
synced 2025-12-06 00:10:04 +01:00
New device access backend.
Allocate loop device late (only when real block device needed). Rework underlying device/file access functions. Move all device (and ioctl) access to utils_device.c. Allows using file where appropriate without allocation loop device.
This commit is contained in:
Milan Broz
295
lib/utils.c
295
lib/utils.c
@@ -22,20 +22,10 @@
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <stdarg.h>
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#include <errno.h>
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#include <linux/fs.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <sys/resource.h>
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#include "libcryptsetup.h"
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#include "internal.h"
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unsigned crypt_getpagesize(void)
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@@ -74,52 +64,15 @@ static void *aligned_malloc(void **base, int size, int alignment)
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#endif
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}
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int device_read_ahead(const char *dev, uint32_t *read_ahead)
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{
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int fd, r = 0;
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long read_ahead_long;
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if ((fd = open(dev, O_RDONLY)) < 0)
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return 0;
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r = ioctl(fd, BLKRAGET, &read_ahead_long) ? 0 : 1;
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close(fd);
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if (r)
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*read_ahead = (uint32_t) read_ahead_long;
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return r;
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}
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static int sector_size(int fd)
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{
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int bsize;
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if (ioctl(fd,BLKSSZGET, &bsize) < 0)
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return -EINVAL;
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else
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return bsize;
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}
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int sector_size_for_device(const char *device)
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{
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int fd = open(device, O_RDONLY);
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int r;
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if(fd < 0)
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return -EINVAL;
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r = sector_size(fd);
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close(fd);
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return r;
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}
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ssize_t write_blockwise(int fd, void *orig_buf, size_t count)
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ssize_t write_blockwise(int fd, int bsize, void *orig_buf, size_t count)
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{
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void *hangover_buf, *hangover_buf_base = NULL;
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void *buf, *buf_base = NULL;
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int r, hangover, solid, bsize, alignment;
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int r, hangover, solid, alignment;
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ssize_t ret = -1;
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if ((bsize = sector_size(fd)) < 0)
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return bsize;
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if (fd == -1 || !orig_buf || bsize <= 0)
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return -1;
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hangover = count % bsize;
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solid = count - hangover;
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@@ -163,14 +116,14 @@ out:
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return ret;
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}
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ssize_t read_blockwise(int fd, void *orig_buf, size_t count) {
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ssize_t read_blockwise(int fd, int bsize, void *orig_buf, size_t count) {
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void *hangover_buf, *hangover_buf_base = NULL;
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void *buf, *buf_base = NULL;
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int r, hangover, solid, bsize, alignment;
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int r, hangover, solid, alignment;
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ssize_t ret = -1;
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if ((bsize = sector_size(fd)) < 0)
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return bsize;
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if (fd == -1 || !orig_buf || bsize <= 0)
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return -1;
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hangover = count % bsize;
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solid = count - hangover;
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@@ -213,15 +166,15 @@ out:
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* is implicitly included in the read/write offset, which can not be set to non-aligned
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* boundaries. Hence, we combine llseek with write.
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*/
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ssize_t write_lseek_blockwise(int fd, char *buf, size_t count, off_t offset) {
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ssize_t write_lseek_blockwise(int fd, int bsize, char *buf, size_t count, off_t offset) {
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char *frontPadBuf;
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void *frontPadBuf_base = NULL;
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int r, bsize, frontHang;
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int r, frontHang;
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size_t innerCount = 0;
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ssize_t ret = -1;
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if ((bsize = sector_size(fd)) < 0)
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return bsize;
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if (fd == -1 || !buf || bsize <= 0)
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return -1;
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frontHang = offset % bsize;
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@@ -255,7 +208,7 @@ ssize_t write_lseek_blockwise(int fd, char *buf, size_t count, off_t offset) {
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count -= innerCount;
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}
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ret = count ? write_blockwise(fd, buf, count) : 0;
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ret = count ? write_blockwise(fd, bsize, buf, count) : 0;
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if (ret >= 0)
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ret += innerCount;
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out:
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@@ -264,171 +217,6 @@ out:
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return ret;
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}
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int device_ready(struct crypt_device *cd, const char *device, int mode)
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{
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int devfd, r = 0;
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ssize_t s;
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struct stat st;
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char buf[512];
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if(stat(device, &st) < 0) {
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log_err(cd, _("Device %s doesn't exist or access denied.\n"), device);
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return -EINVAL;
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}
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if (!S_ISBLK(st.st_mode))
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return -ENOTBLK;
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log_dbg("Trying to open and read device %s.", device);
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devfd = open(device, mode | O_DIRECT | O_SYNC);
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if(devfd < 0) {
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log_err(cd, _("Cannot open device %s for %s%s access.\n"), device,
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(mode & O_EXCL) ? _("exclusive ") : "",
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(mode & O_RDWR) ? _("writable") : _("read-only"));
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return -EINVAL;
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}
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/* Try to read first sector */
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s = read_blockwise(devfd, buf, sizeof(buf));
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if (s < 0 || s != sizeof(buf)) {
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log_verbose(cd, _("Cannot read device %s.\n"), device);
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r = -EIO;
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}
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memset(buf, 0, sizeof(buf));
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close(devfd);
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return r;
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}
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int device_size(const char *device, uint64_t *size)
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{
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int devfd, r = 0;
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devfd = open(device, O_RDONLY);
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if(devfd == -1)
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return -EINVAL;
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if (ioctl(devfd, BLKGETSIZE64, size) < 0)
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r = -EINVAL;
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close(devfd);
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return r;
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}
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static int get_device_infos(const char *device, enum devcheck device_check,
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int *readonly, uint64_t *size)
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{
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struct stat st;
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unsigned long size_small;
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int fd, r = -1;
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int flags = 0;
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*readonly = 0;
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*size = 0;
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if (stat(device, &st) < 0)
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return -EINVAL;
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/* never wipe header on mounted device */
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if (device_check == DEV_EXCL && S_ISBLK(st.st_mode))
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flags |= O_EXCL;
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/* Try to open read-write to check whether it is a read-only device */
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fd = open(device, O_RDWR | flags);
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if (fd == -1 && errno == EROFS) {
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*readonly = 1;
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fd = open(device, O_RDONLY | flags);
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}
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if (fd == -1 && device_check == DEV_EXCL && errno == EBUSY)
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return -EBUSY;
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if (fd == -1)
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return -EINVAL;
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/* If the device can be opened read-write, i.e. readonly is still 0, then
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* check whether BKROGET says that it is read-only. E.g. read-only loop
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* devices may be openend read-write but are read-only according to BLKROGET
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*/
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if (*readonly == 0 && (r = ioctl(fd, BLKROGET, readonly)) < 0)
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goto out;
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if (ioctl(fd, BLKGETSIZE64, size) >= 0) {
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*size >>= SECTOR_SHIFT;
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r = 0;
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goto out;
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}
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if (ioctl(fd, BLKGETSIZE, &size_small) >= 0) {
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*size = (uint64_t)size_small;
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r = 0;
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goto out;
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}
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r = -EINVAL;
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out:
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close(fd);
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return r;
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}
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int device_check_and_adjust(struct crypt_device *cd,
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const char *device,
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enum devcheck device_check,
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uint64_t *size,
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uint64_t *offset,
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uint32_t *flags)
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{
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int r, real_readonly;
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uint64_t real_size;
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if (!device)
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return -ENOTBLK;
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r = get_device_infos(device, device_check, &real_readonly, &real_size);
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if (r < 0) {
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if (r == -EBUSY)
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log_err(cd, _("Cannot use device %s which is in use "
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"(already mapped or mounted).\n"),
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device);
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else
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log_err(cd, _("Cannot get info about device %s.\n"),
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device);
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return r;
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}
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if (*offset >= real_size) {
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log_err(cd, _("Requested offset is beyond real size of device %s.\n"),
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device);
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return -EINVAL;
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}
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if (!*size) {
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*size = real_size;
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if (!*size) {
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log_err(cd, _("Device %s has zero size.\n"), device);
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return -ENOTBLK;
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}
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*size -= *offset;
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}
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/* in case of size is set by parameter */
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if ((real_size - *offset) < *size) {
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log_dbg("Device %s: offset = %" PRIu64 " requested size = %" PRIu64
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", backing device size = %" PRIu64,
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device, *offset, *size, real_size);
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log_err(cd, _("Device %s is too small.\n"), device);
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return -EINVAL;
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}
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if (real_readonly)
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*flags |= CRYPT_ACTIVATE_READONLY;
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log_dbg("Calculated device size is %" PRIu64 " sectors (%s), offset %" PRIu64 ".",
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*size, real_readonly ? "RO" : "RW", *offset);
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return 0;
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}
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/* MEMLOCK */
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#define DEFAULT_PROCESS_PRIORITY -18
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@@ -467,60 +255,3 @@ int crypt_memlock_dec(struct crypt_device *ctx)
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}
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return _memlock_count ? 1 : 0;
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}
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/* DEVICE TOPOLOGY */
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/* block device topology ioctls, introduced in 2.6.32 */
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#ifndef BLKIOMIN
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#define BLKIOMIN _IO(0x12,120)
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#define BLKIOOPT _IO(0x12,121)
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#define BLKALIGNOFF _IO(0x12,122)
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#endif
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void get_topology_alignment(const char *device,
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unsigned long *required_alignment, /* bytes */
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unsigned long *alignment_offset, /* bytes */
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unsigned long default_alignment)
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{
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int dev_alignment_offset = 0;
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unsigned int min_io_size = 0, opt_io_size = 0;
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unsigned long temp_alignment = 0;
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int fd;
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*required_alignment = default_alignment;
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*alignment_offset = 0;
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fd = open(device, O_RDONLY);
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if (fd == -1)
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return;
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/* minimum io size */
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if (ioctl(fd, BLKIOMIN, &min_io_size) == -1) {
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log_dbg("Topology info for %s not supported, using default offset %lu bytes.",
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device, default_alignment);
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goto out;
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}
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/* optimal io size */
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if (ioctl(fd, BLKIOOPT, &opt_io_size) == -1)
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opt_io_size = min_io_size;
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/* alignment offset, bogus -1 means misaligned/unknown */
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if (ioctl(fd, BLKALIGNOFF, &dev_alignment_offset) == -1 || dev_alignment_offset < 0)
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dev_alignment_offset = 0;
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*alignment_offset = (unsigned long)dev_alignment_offset;
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temp_alignment = (unsigned long)min_io_size;
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if (temp_alignment < (unsigned long)opt_io_size)
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temp_alignment = (unsigned long)opt_io_size;
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/* If calculated alignment is multiple of default, keep default */
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if (temp_alignment && (default_alignment % temp_alignment))
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*required_alignment = temp_alignment;
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log_dbg("Topology: IO (%u/%u), offset = %lu; Required alignment is %lu bytes.",
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min_io_size, opt_io_size, *alignment_offset, *required_alignment);
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out:
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(void)close(fd);
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}
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