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loop-util: allow refreshing offset

This commit is contained in:
Lennart Poettering 2019-05-20 16:15:22 +02:00
parent ed9eeb7b0b
commit c37878fced
2 changed files with 17 additions and 3 deletions
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18
src/shared/loop-util.c
View File

@ -208,13 +208,27 @@ int loop_device_open(const char *loop_path, int open_flags, LoopDevice **ret) {
return d->fd;
}
int loop_device_refresh_size(LoopDevice *d) {
int loop_device_refresh_size(LoopDevice *d, uint64_t offset, uint64_t size) {
struct loop_info64 info;
assert(d);
if (d->fd < 0)
return -EBADF;
if (ioctl(d->fd, LOOP_SET_CAPACITY) < 0)
if (ioctl(d->fd, LOOP_GET_STATUS64, &info) < 0)
return -errno;
if (size == UINT64_MAX && offset == UINT64_MAX)
return 0;
if (info.lo_sizelimit == size && info.lo_offset == offset)
return 0;
if (size != UINT64_MAX)
info.lo_sizelimit = size;
if (offset != UINT64_MAX)
info.lo_offset = offset;
if (ioctl(d->fd, LOOP_SET_STATUS64, &info) < 0)
return -errno;
return 0;

2
src/shared/loop-util.h
View File

@ -27,4 +27,4 @@ DEFINE_TRIVIAL_CLEANUP_FUNC(LoopDevice*, loop_device_unref);
void loop_device_relinquish(LoopDevice *d);
int loop_device_refresh_size(LoopDevice *d);
int loop_device_refresh_size(LoopDevice *d, uint64_t offset, uint64_t size);