/* * device backend utilities * * Copyright (C) 2004 Jana Saout * Copyright (C) 2004-2007 Clemens Fruhwirth * 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 #include #include #include #include #include #include #include #ifdef HAVE_SYS_SYSMACROS_H # include /* for major, minor */ #endif #ifdef HAVE_SYS_STATVFS_H # include #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; }