openkylin
/
cryptsetup
mirror of https://gitee.com/openkylin/cryptsetup.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity
cryptsetup/lib/utils_device.c

1090 lines
25 KiB
C
Raw Blame History

/*
* device backend utilities
*
* Copyright (C) 2004 Jana Saout <jana@saout.de>
* Copyright (C) 2004-2007 Clemens Fruhwirth <clemens@endorphin.org>
* Copyright (C) 2009-2023 Red Hat, Inc. All rights reserved.
* Copyright (C) 2009-2023 Milan Broz
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <linux/fs.h>
#include <unistd.h>
#ifdef HAVE_SYS_SYSMACROS_H
# include <sys/sysmacros.h> /* for major, minor */
#endif
#ifdef HAVE_SYS_STATVFS_H
# include <sys/statvfs.h>
#endif
#include "internal.h"
#include "utils_device_locking.h"
struct device {
char *path;
char *file_path;
int loop_fd;
int ro_dev_fd;
int dev_fd;
int dev_fd_excl;
struct crypt_lock_handle *lh;
unsigned int o_direct:1;
unsigned int init_done:1; /* path is bdev or loop already initialized */
/* cached values */
size_t alignment;
size_t block_size;
size_t loop_block_size;
};
static size_t device_fs_block_size_fd(int fd)
{
size_t page_size = crypt_getpagesize();
#ifdef HAVE_SYS_STATVFS_H
struct statvfs buf;
/*
* NOTE: some filesystems (NFS) returns bogus blocksize (1MB).
* Page-size io should always work and avoids increasing IO beyond aligned LUKS header.
*/
if (!fstatvfs(fd, &buf) && buf.f_bsize && buf.f_bsize <= page_size)
return (size_t)buf.f_bsize;
#endif
return page_size;
}
static size_t device_block_size_fd(int fd, size_t *min_size)
{
struct stat st;
size_t bsize;
int arg;
if (fstat(fd, &st) < 0)
return 0;
if (S_ISREG(st.st_mode))
bsize = device_fs_block_size_fd(fd);
else {
if (ioctl(fd, BLKSSZGET, &arg) < 0)
bsize = crypt_getpagesize();
else
bsize = (size_t)arg;
}
if (!min_size)
return bsize;
if (S_ISREG(st.st_mode)) {
/* file can be empty as well */
if (st.st_size > (ssize_t)bsize)
*min_size = bsize;
else
*min_size = st.st_size;
} else {
/* block device must have at least one block */
*min_size = bsize;
}
return bsize;
}
static size_t device_block_phys_size_fd(int fd)
{
struct stat st;
int arg;
size_t bsize = SECTOR_SIZE;
if (fstat(fd, &st) < 0)
return bsize;
if (S_ISREG(st.st_mode))
bsize = MAX_SECTOR_SIZE;
else if (ioctl(fd, BLKPBSZGET, &arg) >= 0)
bsize = (size_t)arg;
return bsize;
}
static size_t device_alignment_fd(int devfd)
{
long alignment = DEFAULT_MEM_ALIGNMENT;
#ifdef _PC_REC_XFER_ALIGN
alignment = fpathconf(devfd, _PC_REC_XFER_ALIGN);
if (alignment < 0)
alignment = DEFAULT_MEM_ALIGNMENT;
#endif
return (size_t)alignment;
}
static int device_read_test(int devfd)
{
char buffer[512];
int r = -EIO;
size_t minsize = 0, blocksize, alignment;
blocksize = device_block_size_fd(devfd, &minsize);
alignment = device_alignment_fd(devfd);
if (!blocksize || !alignment)
return -EINVAL;
if (minsize == 0)
return 0;
if (minsize > sizeof(buffer))
minsize = sizeof(buffer);
if (read_blockwise(devfd, blocksize, alignment, buffer, minsize) == (ssize_t)minsize)
r = 0;
crypt_safe_memzero(buffer, sizeof(buffer));
return r;
}
/*
* The direct-io is always preferred. The header is usually mapped to the same
* device and can be accessed when the rest of device is mapped to data device.
* Using direct-io ensures that we do not mess with data in cache.
* (But proper alignment should prevent this in the first place.)
* The read test is needed to detect broken configurations (seen with remote
* block devices) that allow open with direct-io but then fails on read.
*/
static int device_ready(struct crypt_device *cd, struct device *device)
{
int devfd = -1, r = 0;
struct stat st;
size_t tmp_size;
if (!device)
return -EINVAL;
if (device->o_direct) {
log_dbg(cd, "Trying to open and read device %s with direct-io.",
device_path(device));
device->o_direct = 0;
devfd = open(device_path(device), O_RDONLY | O_DIRECT);
if (devfd >= 0) {
if (device_read_test(devfd) == 0) {
device->o_direct = 1;
} else {
close(devfd);
devfd = -1;
}
}
}
if (devfd < 0) {
log_dbg(cd, "Trying to open device %s without direct-io.",
device_path(device));
devfd = open(device_path(device), O_RDONLY);
}
if (devfd < 0) {
log_err(cd, _("Device %s does not exist or access denied."),
device_path(device));
return -EINVAL;
}
if (fstat(devfd, &st) < 0)
r = -EINVAL;
else if (!S_ISBLK(st.st_mode))
r = S_ISREG(st.st_mode) ? -ENOTBLK : -EINVAL;
if (r == -EINVAL) {
log_err(cd, _("Device %s is not compatible."),
device_path(device));
close(devfd);
return r;
}
/* Allow only increase (loop device) */
tmp_size = device_alignment_fd(devfd);
if (tmp_size > device->alignment)
device->alignment = tmp_size;
tmp_size = device_block_size_fd(devfd, NULL);
if (tmp_size > device->block_size)
device->block_size = tmp_size;
close(devfd);
return r;
}
static int _open_locked(struct crypt_device *cd, struct device *device, int flags)
{
int fd;
if (!device)
return -EINVAL;
log_dbg(cd, "Opening locked device %s", device_path(device));
if ((flags & O_ACCMODE) != O_RDONLY && device_locked_readonly(device->lh)) {
log_dbg(cd, "Cannot open locked device %s in write mode. Read lock held.", device_path(device));
return -EAGAIN;
}
fd = open(device_path(device), flags);
if (fd < 0)
return -errno;
if (device_locked_verify(cd, fd, device->lh)) {
/* fd doesn't correspond to a locked resource */
close(fd);
log_dbg(cd, "Failed to verify lock resource for device %s.", device_path(device));
return -EINVAL;
}
return fd;
}
/*
* Common wrapper for device sync.
*/
void device_sync(struct crypt_device *cd, struct device *device)
{
if (!device || device->dev_fd < 0)
return;
if (fsync(device->dev_fd) == -1)
log_dbg(cd, "Cannot sync device %s.", device_path(device));
}
/*
* in non-locked mode returns always fd or -1
*
* in locked mode:
* opened fd or one of:
* -EAGAIN : requested write mode while device being locked in via shared lock
* -EINVAL : invalid lock fd state
* -1 : all other errors
*/
static int device_open_internal(struct crypt_device *cd, struct device *device, int flags)
{
int access, devfd;
if (device->o_direct)
flags |= O_DIRECT;
access = flags & O_ACCMODE;
if (access == O_WRONLY)
access = O_RDWR;
if (access == O_RDONLY && device->ro_dev_fd >= 0) {
log_dbg(cd, "Reusing open r%c fd on device %s", 'o', device_path(device));
return device->ro_dev_fd;
} else if (access == O_RDWR && device->dev_fd >= 0) {
log_dbg(cd, "Reusing open r%c fd on device %s", 'w', device_path(device));
return device->dev_fd;
}
if (device_locked(device->lh))
devfd = _open_locked(cd, device, flags);
else
devfd = open(device_path(device), flags);
if (devfd < 0) {
log_dbg(cd, "Cannot open device %s%s.",
device_path(device),
access != O_RDONLY ? " for write" : "");
return devfd;
}
if (access == O_RDONLY)
device->ro_dev_fd = devfd;
else
device->dev_fd = devfd;
return devfd;
}
int device_open(struct crypt_device *cd, struct device *device, int flags)
{
if (!device)
return -EINVAL;
assert(!device_locked(device->lh));
return device_open_internal(cd, device, flags);
}
int device_open_excl(struct crypt_device *cd, struct device *device, int flags)
{
const char *path;
struct stat st;
if (!device)
return -EINVAL;
assert(!device_locked(device->lh));
if (device->dev_fd_excl < 0) {
path = device_path(device);
if (stat(path, &st))
return -EINVAL;
if (!S_ISBLK(st.st_mode))
log_dbg(cd, "%s is not a block device. Can't open in exclusive mode.",
path);
else {
/* open(2) with O_EXCL (w/o O_CREAT) on regular file is undefined behaviour according to man page */
/* coverity[toctou] */
device->dev_fd_excl = open(path, O_RDONLY | O_EXCL); /* lgtm[cpp/toctou-race-condition] */
if (device->dev_fd_excl < 0)
return errno == EBUSY ? -EBUSY : device->dev_fd_excl;
if (fstat(device->dev_fd_excl, &st) || !S_ISBLK(st.st_mode)) {
log_dbg(cd, "%s is not a block device. Can't open in exclusive mode.",
path);
close(device->dev_fd_excl);
device->dev_fd_excl = -1;
} else
log_dbg(cd, "Device %s is blocked for exclusive open.", path);
}
}
return device_open_internal(cd, device, flags);
}
void device_release_excl(struct crypt_device *cd, struct device *device)
{
if (device && device->dev_fd_excl >= 0) {
if (close(device->dev_fd_excl))
log_dbg(cd, "Failed to release exclusive handle on device %s.",
device_path(device));
else
log_dbg(cd, "Closed exclusive fd for %s.", device_path(device));
device->dev_fd_excl = -1;
}
}
int device_open_locked(struct crypt_device *cd, struct device *device, int flags)
{
if (!device)
return -EINVAL;
assert(!crypt_metadata_locking_enabled() || device_locked(device->lh));
return device_open_internal(cd, device, flags);
}
/* Avoid any read from device, expects direct-io to work. */
int device_alloc_no_check(struct device **device, const char *path)
{
struct device *dev;
if (!path) {
*device = NULL;
return 0;
}
dev = malloc(sizeof(struct device));
if (!dev)
return -ENOMEM;
memset(dev, 0, sizeof(struct device));
dev->path = strdup(path);
if (!dev->path) {
free(dev);
return -ENOMEM;
}
dev->loop_fd = -1;
dev->ro_dev_fd = -1;
dev->dev_fd = -1;
dev->dev_fd_excl = -1;
dev->o_direct = 1;
*device = dev;
return 0;
}
int device_alloc(struct crypt_device *cd, struct device **device, const char *path)
{
struct device *dev;
int r;
r = device_alloc_no_check(&dev, path);
if (r < 0)
return r;
if (dev) {
r = device_ready(cd, dev);
if (!r) {
dev->init_done = 1;
} else if (r == -ENOTBLK) {
/* alloc loop later */
} else if (r < 0) {
free(dev->path);
free(dev);
return -ENOTBLK;
}
}
*device = dev;
return 0;
}
void device_free(struct crypt_device *cd, struct device *device)
{
if (!device)
return;
device_close(cd, device);
if (device->dev_fd_excl != -1) {
log_dbg(cd, "Closed exclusive fd for %s.", device_path(device));
close(device->dev_fd_excl);
}
if (device->loop_fd != -1) {
log_dbg(cd, "Closed loop %s (%s).", device->path, device->file_path);
close(device->loop_fd);
}
assert(!device_locked(device->lh));
free(device->file_path);
free(device->path);
free(device);
}
/* Get block device path */
const char *device_block_path(const struct device *device)
{
if (!device || !device->init_done)
return NULL;
return device->path;
}
/* Get device-mapper name of device (if possible) */
const char *device_dm_name(const struct device *device)
{
const char *dmdir = dm_get_dir();
size_t dmdir_len = strlen(dmdir);
if (!device || !device->init_done)
return NULL;
if (strncmp(device->path, dmdir, dmdir_len))
return NULL;
return &device->path[dmdir_len+1];
}
/* Get path to device / file */
const char *device_path(const struct device *device)
{
if (!device)
return NULL;
if (device->file_path)
return device->file_path;
return device->path;
}
/* block device topology ioctls, introduced in 2.6.32 */
#ifndef BLKIOMIN
#define BLKIOMIN _IO(0x12,120)
#define BLKIOOPT _IO(0x12,121)
#define BLKALIGNOFF _IO(0x12,122)
#endif
void device_topology_alignment(struct crypt_device *cd,
struct device *device,
unsigned long *required_alignment, /* bytes */
unsigned long *alignment_offset, /* bytes */
unsigned long default_alignment)
{
int dev_alignment_offset = 0;
unsigned int min_io_size = 0, opt_io_size = 0;
unsigned long temp_alignment = 0;
int fd;
*required_alignment = default_alignment;
*alignment_offset = 0;
if (!device || !device->path) //FIXME
return;
fd = open(device->path, O_RDONLY);
if (fd == -1)
return;
/* minimum io size */
if (ioctl(fd, BLKIOMIN, &min_io_size) == -1) {
log_dbg(cd, "Topology info for %s not supported, using default offset %lu bytes.",
device->path, default_alignment);
goto out;
}
/* optimal io size */
if (ioctl(fd, BLKIOOPT, &opt_io_size) == -1)
opt_io_size = min_io_size;
/* alignment offset, bogus -1 means misaligned/unknown */
if (ioctl(fd, BLKALIGNOFF, &dev_alignment_offset) == -1 || dev_alignment_offset < 0)
dev_alignment_offset = 0;
*alignment_offset = (unsigned long)dev_alignment_offset;
temp_alignment = (unsigned long)min_io_size;
/*
* Ignore bogus opt-io that could break alignment.
* Also real opt_io_size should be aligned to minimal page size (4k).
* Some bogus USB enclosures reports wrong data here.
*/
if ((temp_alignment < (unsigned long)opt_io_size) &&
!((unsigned long)opt_io_size % temp_alignment) && !MISALIGNED_4K(opt_io_size))
temp_alignment = (unsigned long)opt_io_size;
else if (opt_io_size && (opt_io_size != min_io_size))
log_err(cd, _("Ignoring bogus optimal-io size for data device (%u bytes)."), opt_io_size);
/* If calculated alignment is multiple of default, keep default */
if (temp_alignment && (default_alignment % temp_alignment))
*required_alignment = temp_alignment;
log_dbg(cd, "Topology: IO (%u/%u), offset = %lu; Required alignment is %lu bytes.",
min_io_size, opt_io_size, *alignment_offset, *required_alignment);
out:
(void)close(fd);
}
size_t device_block_size(struct crypt_device *cd, struct device *device)
{
int fd;
if (!device)
return 0;
if (device->block_size)
return device->block_size;
fd = open(device->file_path ?: device->path, O_RDONLY);
if (fd >= 0) {
device->block_size = device_block_size_fd(fd, NULL);
close(fd);
}
if (!device->block_size)
log_dbg(cd, "Cannot get block size for device %s.", device_path(device));
return device->block_size;
}
size_t device_optimal_encryption_sector_size(struct crypt_device *cd, struct device *device)
{
int fd;
size_t phys_block_size;
if (!device)
return SECTOR_SIZE;
fd = open(device->file_path ?: device->path, O_RDONLY);
if (fd < 0) {
log_dbg(cd, "Cannot get optimal encryption sector size for device %s.", device_path(device));
return SECTOR_SIZE;
}
/* cache device block size */
device->block_size = device_block_size_fd(fd, NULL);
if (!device->block_size) {
close(fd);
log_dbg(cd, "Cannot get block size for device %s.", device_path(device));
return SECTOR_SIZE;
}
if (device->block_size >= MAX_SECTOR_SIZE) {
close(fd);
return MISALIGNED(device->block_size, MAX_SECTOR_SIZE) ? SECTOR_SIZE : MAX_SECTOR_SIZE;
}
phys_block_size = device_block_phys_size_fd(fd);
close(fd);
if (device->block_size >= phys_block_size ||
phys_block_size <= SECTOR_SIZE ||
phys_block_size > MAX_SECTOR_SIZE ||
MISALIGNED(phys_block_size, device->block_size))
return device->block_size;
return phys_block_size;
}
int device_read_ahead(struct device *device, uint32_t *read_ahead)
{
int fd, r = 0;
long read_ahead_long;
if (!device)
return 0;
if ((fd = open(device->path, O_RDONLY)) < 0)
return 0;
r = ioctl(fd, BLKRAGET, &read_ahead_long) ? 0 : 1;
close(fd);
if (r)
*read_ahead = (uint32_t) read_ahead_long;
return r;
}
/* Get data size in bytes */
int device_size(struct device *device, uint64_t *size)
{
struct stat st;
int devfd, r = -EINVAL;
if (!device)
return -EINVAL;
devfd = open(device->path, O_RDONLY);
if (devfd == -1)
return -EINVAL;
if (fstat(devfd, &st) < 0)
goto out;
if (S_ISREG(st.st_mode)) {
*size = (uint64_t)st.st_size;
r = 0;
} else if (ioctl(devfd, BLKGETSIZE64, size) >= 0)
r = 0;
out:
close(devfd);
return r;
}
/* For a file, allocate the required space */
int device_fallocate(struct device *device, uint64_t size)
{
struct stat st;
int devfd, r = -EINVAL;
if (!device)
return -EINVAL;
devfd = open(device_path(device), O_RDWR);
if (devfd == -1)
return -EINVAL;
if (!fstat(devfd, &st) && S_ISREG(st.st_mode) &&
((uint64_t)st.st_size >= size || !posix_fallocate(devfd, 0, size))) {
r = 0;
if (device->file_path && crypt_loop_resize(device->path))
r = -EINVAL;
}
close(devfd);
return r;
}
int device_check_size(struct crypt_device *cd,
struct device *device,
uint64_t req_offset, int falloc)
{
uint64_t dev_size;
if (device_size(device, &dev_size)) {
log_dbg(cd, "Cannot get device size for device %s.", device_path(device));
return -EIO;
}
log_dbg(cd, "Device size %" PRIu64 ", offset %" PRIu64 ".", dev_size, req_offset);
if (req_offset > dev_size) {
/* If it is header file, increase its size */
if (falloc && !device_fallocate(device, req_offset))
return 0;
log_err(cd, _("Device %s is too small. Need at least %" PRIu64 " bytes."),
device_path(device), req_offset);
return -EINVAL;
}
return 0;
}
static int device_info(struct crypt_device *cd,
struct device *device,
enum devcheck device_check,
int *readonly, uint64_t *size)
{
struct stat st;
int fd = -1, r, flags = 0, real_readonly;
uint64_t real_size;
if (!device)
return -ENOTBLK;
real_readonly = 0;
real_size = 0;
if (stat(device->path, &st) < 0) {
r = -EINVAL;
goto out;
}
/* never wipe header on mounted device */
if (device_check == DEV_EXCL && S_ISBLK(st.st_mode))
flags |= O_EXCL;
/* Try to open read-write to check whether it is a read-only device */
/* coverity[toctou] */
fd = open(device->path, O_RDWR | flags);
if (fd == -1 && errno == EROFS) {
real_readonly = 1;
fd = open(device->path, O_RDONLY | flags);
}
if (fd == -1 && device_check == DEV_EXCL && errno == EBUSY) {
r = -EBUSY;
goto out;
}
if (fd == -1) {
r = errno ? -errno : -EINVAL;
goto out;
}
r = 0;
if (S_ISREG(st.st_mode)) {
//FIXME: add readonly check
real_size = (uint64_t)st.st_size;
real_size >>= SECTOR_SHIFT;
} else {
/* If the device can be opened read-write, i.e. readonly is still 0, then
* check whether BKROGET says that it is read-only. E.g. read-only loop
* devices may be opened read-write but are read-only according to BLKROGET
*/
if (real_readonly == 0 && (r = ioctl(fd, BLKROGET, &real_readonly)) < 0)
goto out;
r = ioctl(fd, BLKGETSIZE64, &real_size);
if (r >= 0) {
real_size >>= SECTOR_SHIFT;
goto out;
}
}
out:
if (fd != -1)
close(fd);
switch (r) {
case 0:
if (readonly)
*readonly = real_readonly;
if (size)
*size = real_size;
break;
case -EBUSY:
log_err(cd, _("Cannot use device %s which is in use "
"(already mapped or mounted)."), device_path(device));
break;
case -EACCES:
log_err(cd, _("Cannot use device %s, permission denied."), device_path(device));
break;
default:
log_err(cd, _("Cannot get info about device %s."), device_path(device));
r = -EINVAL;
}
return r;
}
int device_check_access(struct crypt_device *cd,
struct device *device,
enum devcheck device_check)
{
return device_info(cd, device, device_check, NULL, NULL);
}
static int device_internal_prepare(struct crypt_device *cd, struct device *device)
{
char *loop_device = NULL, *file_path = NULL;
int r, loop_fd, readonly = 0;
if (device->init_done)
return 0;
if (getuid() || geteuid()) {
log_err(cd, _("Cannot use a loopback device, "
"running as non-root user."));
return -ENOTSUP;
}
log_dbg(cd, "Allocating a free loop device (block size: %zu).",
device->loop_block_size ?: SECTOR_SIZE);
/* Keep the loop open, detached on last close. */
loop_fd = crypt_loop_attach(&loop_device, device->path, 0, 1, &readonly, device->loop_block_size);
if (loop_fd == -1) {
log_err(cd, _("Attaching loopback device failed "
"(loop device with autoclear flag is required)."));
free(loop_device);
return -EINVAL;
}
file_path = device->path;
device->path = loop_device;
r = device_ready(cd, device);
if (r < 0) {
device->path = file_path;
crypt_loop_detach(loop_device);
free(loop_device);
return r;
}
log_dbg(cd, "Attached loop device block size is %zu bytes.", device_block_size_fd(loop_fd, NULL));
device->loop_fd = loop_fd;
device->file_path = file_path;
device->init_done = 1;
return 0;
}
int device_block_adjust(struct crypt_device *cd,
struct device *device,
enum devcheck device_check,
uint64_t device_offset,
uint64_t *size,
uint32_t *flags)
{
int r, real_readonly;
uint64_t real_size;
if (!device)
return -ENOTBLK;
r = device_internal_prepare(cd, device);
if (r)
return r;
r = device_info(cd, device, device_check, &real_readonly, &real_size);
if (r)
return r;
if (device_offset >= real_size) {
log_err(cd, _("Requested offset is beyond real size of device %s."),
device_path(device));
return -EINVAL;
}
if (size && !*size) {
*size = real_size;
if (!*size) {
log_err(cd, _("Device %s has zero size."), device_path(device));
return -ENOTBLK;
}
*size -= device_offset;
}
/* in case of size is set by parameter */
if (size && ((real_size - device_offset) < *size)) {
log_dbg(cd, "Device %s: offset = %" PRIu64 " requested size = %" PRIu64
", backing device size = %" PRIu64,
device->path, device_offset, *size, real_size);
log_err(cd, _("Device %s is too small."), device_path(device));
return -EINVAL;
}
if (flags && real_readonly)
*flags |= CRYPT_ACTIVATE_READONLY;
if (size)
log_dbg(cd, "Calculated device size is %" PRIu64" sectors (%s), offset %" PRIu64 ".",
*size, real_readonly ? "RO" : "RW", device_offset);
return 0;
}
size_t size_round_up(size_t size, size_t block)
{
size_t s = (size + (block - 1)) / block;
return s * block;
}
void device_disable_direct_io(struct device *device)
{
if (device)
device->o_direct = 0;
}
int device_direct_io(const struct device *device)
{
return device ? device->o_direct : 0;
}
static int device_compare_path(const char *path1, const char *path2)
{
struct stat st_path1, st_path2;
if (stat(path1, &st_path1 ) < 0 || stat(path2, &st_path2 ) < 0)
return -EINVAL;
if (S_ISBLK(st_path1.st_mode) && S_ISBLK(st_path2.st_mode))
return (st_path1.st_rdev == st_path2.st_rdev) ? 1 : 0;
if (S_ISREG(st_path1.st_mode) && S_ISREG(st_path2.st_mode))
return (st_path1.st_ino == st_path2.st_ino &&
st_path1.st_dev == st_path2.st_dev) ? 1 : 0;
return 0;
}
int device_is_identical(struct device *device1, struct device *device2)
{
if (!device1 || !device2)
return 0;
if (device1 == device2)
return 1;
if (!strcmp(device_path(device1), device_path(device2)))
return 1;
return device_compare_path(device_path(device1), device_path(device2));
}
int device_is_rotational(struct device *device)
{
struct stat st;
if (!device)
return -EINVAL;
if (stat(device_path(device), &st) < 0)
return -EINVAL;
if (!S_ISBLK(st.st_mode))
return 0;
return crypt_dev_is_rotational(major(st.st_rdev), minor(st.st_rdev));
}
size_t device_alignment(struct device *device)
{
int devfd;
if (!device)
return -EINVAL;
if (!device->alignment) {
devfd = open(device_path(device), O_RDONLY);
if (devfd != -1) {
device->alignment = device_alignment_fd(devfd);
close(devfd);
}
}
return device->alignment;
}
void device_set_lock_handle(struct device *device, struct crypt_lock_handle *h)
{
if (device)
device->lh = h;
}
struct crypt_lock_handle *device_get_lock_handle(struct device *device)
{
return device ? device->lh : NULL;
}
int device_read_lock(struct crypt_device *cd, struct device *device)
{
if (!device || !crypt_metadata_locking_enabled())
return 0;
if (device_read_lock_internal(cd, device))
return -EBUSY;
return 0;
}
int device_write_lock(struct crypt_device *cd, struct device *device)
{
if (!device || !crypt_metadata_locking_enabled())
return 0;
assert(!device_locked(device->lh) || !device_locked_readonly(device->lh));
return device_write_lock_internal(cd, device);
}
void device_read_unlock(struct crypt_device *cd, struct device *device)
{
if (!device || !crypt_metadata_locking_enabled())
return;
assert(device_locked(device->lh));
device_unlock_internal(cd, device);
}
void device_write_unlock(struct crypt_device *cd, struct device *device)
{
if (!device || !crypt_metadata_locking_enabled())
return;
assert(device_locked(device->lh) && !device_locked_readonly(device->lh));
device_unlock_internal(cd, device);
}
bool device_is_locked(struct device *device)
{
return device ? device_locked(device->lh) : 0;
}
void device_close(struct crypt_device *cd, struct device *device)
{
if (!device)
return;
if (device->ro_dev_fd != -1) {
log_dbg(cd, "Closing read only fd for %s.", device_path(device));
if (close(device->ro_dev_fd))
log_dbg(cd, "Failed to close read only fd for %s.", device_path(device));
device->ro_dev_fd = -1;
}
if (device->dev_fd != -1) {
log_dbg(cd, "Closing read write fd for %s.", device_path(device));
if (close(device->dev_fd))
log_dbg(cd, "Failed to close read write fd for %s.", device_path(device));
device->dev_fd = -1;
}
}
void device_set_block_size(struct device *device, size_t size)
{
if (!device)
return;
device->loop_block_size = size;
}
Reference in New Issue View Git Blame Copy Permalink