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Use loop functions even in api test.

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git-svn-id: https://cryptsetup.googlecode.com/svn/trunk@448 36d66b0a-2a48-0410-832c-cd162a569da5
This commit is contained in:
Milan Broz
2011-03-12 22:29:14 +00:00
parent dd9bff8d67
commit 01e03f7002
5 changed files with 57 additions and 61 deletions
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40
lib/utils_loop.c
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@@ -35,7 +35,7 @@ char *crypt_loop_get_device(void)
struct stat st;
struct loop_info64 lo64 = {0};
for(i = 0; i < 256; i++) {
for (i = 0; i < 256; i++) {
sprintf(dev, "/dev/loop%d", i);
if (stat(dev, &st) || !S_ISBLK(st.st_mode))
return NULL;
@@ -44,7 +44,8 @@ char *crypt_loop_get_device(void)
if (loop_fd < 0)
return NULL;
if(ioctl(loop_fd, LOOP_GET_STATUS64, &lo64) && errno == ENXIO) {
if (ioctl(loop_fd, LOOP_GET_STATUS64, &lo64) &&
errno == ENXIO) {
close(loop_fd);
return strdup(dev);
}
@@ -54,8 +55,8 @@ char *crypt_loop_get_device(void)
return NULL;
}
int crypt_loop_attach(const char *loop, const char *file,
int offset, int *readonly)
int crypt_loop_attach(const char *loop, const char *file, int offset,
int autoclear, int *readonly)
{
struct loop_info64 lo64 = {0};
int loop_fd = -1, file_fd = -1, r = 1;
@@ -74,7 +75,8 @@ int crypt_loop_attach(const char *loop, const char *file,
strncpy((char*)lo64.lo_file_name, file, LO_NAME_SIZE);
lo64.lo_offset = offset;
lo64.lo_flags |= LO_FLAGS_AUTOCLEAR;
if (autoclear)
lo64.lo_flags |= LO_FLAGS_AUTOCLEAR;
if (ioctl(loop_fd, LOOP_SET_FD, file_fd) < 0)
goto out;
@@ -85,11 +87,13 @@ int crypt_loop_attach(const char *loop, const char *file,
}
/* Verify that autoclear is really set */
memset(&lo64, 0, sizeof(lo64));
if (ioctl(loop_fd, LOOP_GET_STATUS64, &lo64) < 0 ||
!(lo64.lo_flags & LO_FLAGS_AUTOCLEAR)) {
if (autoclear) {
memset(&lo64, 0, sizeof(lo64));
if (ioctl(loop_fd, LOOP_GET_STATUS64, &lo64) < 0 ||
!(lo64.lo_flags & LO_FLAGS_AUTOCLEAR)) {
(void)ioctl(loop_fd, LOOP_CLR_FD, 0);
goto out;
goto out;
}
}
r = 0;
@@ -101,6 +105,21 @@ out:
return r ? -1 : loop_fd;
}
int crypt_loop_detach(const char *loop)
{
int loop_fd = -1, r = 1;
loop_fd = open(loop, O_RDONLY);
if (loop_fd < 0)
return 1;
if (!ioctl(loop_fd, LOOP_CLR_FD, 0))
r = 0;
close(loop_fd);
return r;
}
char *crypt_loop_backing_file(const char *loop)
{
struct loop_info64 lo64 = {0};
@@ -127,6 +146,9 @@ int crypt_loop_device(const char *loop)
{
struct stat st;
if (!loop)
return 0;
if (stat(loop, &st) || !S_ISBLK(st.st_mode) ||
major(st.st_rdev) != LOOP_DEV_MAJOR)
return 0;