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Set block size for loop device if supported by kernel (4.13+).

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This commit is contained in:
Milan Broz
2017-08-22 13:45:59 +02:00
parent 497fb0b3c3
commit 4e2deadba7
1 changed files with 26 additions and 0 deletions
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26
lib/utils_loop.c
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@@ -32,6 +32,9 @@
#ifdef HAVE_SYS_SYSMACROS_H
# include <sys/sysmacros.h> /* for major, minor */
#endif
#ifdef HAVE_SYS_STATVFS_H
# include <sys/statvfs.h>
#endif
#include <linux/loop.h>
#include "utils_loop.h"
@@ -50,6 +53,11 @@
#define LOOP_SET_CAPACITY 0x4C07
#endif
#ifndef LO_FLAGS_BLOCKSIZE
#define LO_FLAGS_BLOCKSIZE 32
#define LO_INFO_BLOCKSIZE(l) (l)->lo_init[0]
#endif
static char *crypt_loop_get_device_old(void)
{
char dev[20];
@@ -100,6 +108,21 @@ static char *crypt_loop_get_device(void)
return strdup(dev);
}
static size_t crypt_loop_block_size_fd(int fd)
{
size_t bs = 512;
#ifdef HAVE_SYS_STATVFS_H
struct statvfs buf;
if (!fstatvfs(fd, &buf) && buf.f_bsize)
bs = (size_t)buf.f_bsize;
if (bs != 1024 && bs != 2048 && bs != 4096)
bs = 512;
#endif
return bs;
}
int crypt_loop_attach(char **loop, const char *file, int offset,
int autoclear, int *readonly)
{
@@ -144,6 +167,9 @@ int crypt_loop_attach(char **loop, const char *file, int offset,
if (autoclear)
lo64.lo_flags |= LO_FLAGS_AUTOCLEAR;
LO_INFO_BLOCKSIZE(&lo64) = crypt_loop_block_size_fd(file_fd);
lo64.lo_flags |= LO_FLAGS_BLOCKSIZE;
if (ioctl(loop_fd, LOOP_SET_STATUS64, &lo64) < 0) {
(void)ioctl(loop_fd, LOOP_CLR_FD, 0);
goto out;