/*!
* \brief Label database, with \p aversion in host order.
*/
int
uphys_setlabel(struct ubik_dbase *adbase, afs_int32 afile,
struct ubik_version *aversion)
{
struct ubik_hdr thdr;
afs_int32 code, fd;
fd = uphys_open(adbase, afile);
if (fd < 0)
return UNOENT;
memset(&thdr, 0, sizeof(thdr));
thdr.version.epoch = htonl(aversion->epoch);
thdr.version.counter = htonl(aversion->counter);
thdr.magic = htonl(UBIK_MAGIC);
thdr.size = htons(HDRSIZE);
code = write(fd, &thdr, sizeof(thdr));
fsync(fd); /* preserve over crash */
uphys_close(fd);
if (code != sizeof(thdr)) {
return EIO;
}
return 0;
}
int
uphys_sync(struct ubik_dbase *adbase, afs_int32 afile)
{
afs_int32 code, fd;
fd = uphys_open(adbase, afile);
code = fsync(fd);
uphys_close(fd);
return code;
}
int
uphys_read(struct ubik_dbase *adbase, afs_int32 afile,
void *abuffer, afs_int32 apos, afs_int32 alength)
{
int fd;
afs_int32 code;
fd = uphys_open(adbase, afile);
if (fd < 0)
return -1;
code = lseek(fd, apos + HDRSIZE, 0);
if (code < 0) {
uphys_close(fd);
return -1;
}
code = read(fd, abuffer, alength);
uphys_close(fd);
return code;
}
/*!
* \brief Get database label, with \p aversion in host order.
*/
int
uphys_getlabel(struct ubik_dbase *adbase, afs_int32 afile,
struct ubik_version *aversion)
{
struct ubik_hdr thdr;
afs_int32 code, fd;
fd = uphys_open(adbase, afile);
if (fd < 0)
return UNOENT;
code = read(fd, &thdr, sizeof(thdr));
if (code != sizeof(thdr)) {
uphys_close(fd);
return EIO;
}
aversion->epoch = ntohl(thdr.version.epoch);
aversion->counter = ntohl(thdr.version.counter);
uphys_close(fd);
return 0;
}
int
uphys_truncate(struct ubik_dbase *adbase, afs_int32 afile,
afs_int32 asize)
{
afs_int32 code, fd;
fd = uphys_open(adbase, afile);
if (fd < 0)
return UNOENT;
code = ftruncate(fd, asize + HDRSIZE);
uphys_close(fd);
return code;
}
int
uphys_write(struct ubik_dbase *adbase, afs_int32 afile,
void *abuffer, afs_int32 apos, afs_int32 alength)
{
int fd;
afs_int32 code;
afs_int32 length;
fd = uphys_open(adbase, afile);
if (fd < 0)
return -1;
code = lseek(fd, apos + HDRSIZE, 0);
if (code < 0) {
uphys_close(fd);
return -1;
}
length = write(fd, abuffer, alength);
code = uphys_close(fd);
if (code)
return -1;
else
return length;
}
int
uphys_stat(struct ubik_dbase *adbase, afs_int32 afid, struct ubik_stat *astat)
{
int fd;
struct stat tstat;
afs_int32 code;
fd = uphys_open(adbase, afid);
if (fd < 0)
return fd;
code = fstat(fd, &tstat);
uphys_close(fd);
if (code < 0) {
return code;
}
astat->mtime = tstat.st_mtime;
code = tstat.st_size - HDRSIZE;
if (code < 0)
astat->size = 0;
else
astat->size = code;
return 0;
}