void jlist_insert_before(JList list, JLink sibling, void *data)
{
if (jlist_empty(list))
jlist_prepend(list, data);
else if (sibling) {
JLink new_link;
new_link = new jlink(data);
new_link->prev = sibling->prev;
new_link->next = sibling;
new_link->prev->next = new_link;
new_link->next->prev = new_link;
list->length++;
}
else
jlist_append(list, data);
}
int capfs_ftruncate64(int fd, int64_t length)
{
int i;
ireq req;
memset(&req, 0, sizeof(req));
/* check for badness */
if (fd < 0 || fd >= CAPFS_NR_OPEN
|| (pfds[fd] && pfds[fd]->fs == FS_RESV))
{
errno = EBADF;
return(-1);
}
/* check for UNIX */
if (!pfds[fd] || pfds[fd]->fs==FS_UNIX) {
#ifndef LARGE_FILE_SUPPORT
if ((off_t) length == length) {
return ftruncate(fd, (off_t) length);
}
else {
errno = EINVAL;
return(-1);
}
#else
return ftruncate64(fd, length);
#endif
}
if (pfds[fd]->fs == FS_PDIR) {
errno = EISDIR;
return(-1);
}
if (capfs_mode == 0)
{
req.majik_nr = IOD_MAJIK_NR;
req.release_nr = CAPFS_RELEASE_NR;
req.type = IOD_FTRUNCATE;
req.dsize = 0;
req.req.ftruncate.f_ino = FINO;
req.req.ftruncate.cap = pfds[fd]->fd.cap;
req.req.ftruncate.length = length;
/* build job to send reqs and recv acks */
if (build_simple_jobs(pfds[fd], &req) < 0) {
LOG(stderr, WARNING_MSG, SUBSYS_LIB, "capfs_ftruncate: build_simple_jobs failed\n");
return(-1);
}
/* call do_job */
while (!jlist_empty(active_p)) {
if (do_jobs(active_p, &socks, -1) < 0) {
LOG(stderr, WARNING_MSG, SUBSYS_LIB, "capfs_ftruncate: do_jobs failed\n");
return(-1);
}
}
/* check acks from iods */
for (i=0; i < PCNT; i++) {
if (pfds[fd]->fd.iod[i].ack.status) {
LOG(stderr, WARNING_MSG, SUBSYS_LIB, "capfs_ftruncate: non-zero status returned from iod %d\n", i);
errno = pfds[fd]->fd.iod[i].ack.eno;
return(-1);
}
}
}
return(0);
}
int capfs_read(int fd, char *buf, size_t count)
{
int i;
int64_t size = 0;
fdesc_p pfd_p = pfds[fd];
/* variables added for correct handling of EOF */
char *contacted;
int64_t exp_next_off, act_last_off, known_file_sz, calc_file_sz, start_off;
if (fd < 0 || fd >= CAPFS_NR_OPEN
|| (pfds[fd] && pfds[fd]->fs == FS_RESV)) {
errno = EBADF;
return(-1);
}
if (capfs_mode == 1) {
LOG(stderr, CRITICAL_MSG, SUBSYS_LIB, "capfs_read is not yet implemented for capfs! Please use"
"the VFS interface for accessing such files\n");
errno = ENOSYS;
return -1;
}
if (!pfd_p || pfd_p->fs == FS_UNIX) return(unix_read(fd, buf, count));
if (pfd_p->fs == FS_PDIR) return(unix_read(fd, buf, count));
#ifdef STRICT_FDESC_CHECK
if (do_fdesc_check(fd) < 0) {
LOG(stderr, CRITICAL_MSG, SUBSYS_LIB, "check failed at start of capfs_read()\n");
}
#endif
start_off = pfd_p->fd.off;
exp_next_off = pfd_p->fd.off + count;
known_file_sz = 0;
contacted = malloc(PCOUNT * sizeof(char));
for (i = 0; i < PCOUNT; i++) {
contacted[i] = 0;
pfd_p->fd.iod[i].ack.status = 0;
pfd_p->fd.iod[i].ack.dsize = 0;
}
/* build jobs, including requests and acks */
if (build_rw_jobs(pfd_p, buf, count, J_READ) < 0) {
LOG(stderr, WARNING_MSG, SUBSYS_LIB, "build_rw_jobs failed in capfs_read\n");
return(-1);
}
/* determine what iods we will contact */
for (i = 0; i < PCOUNT; i++) {
/* this isn't so efficient, but i don't want to muck with jlist imp. */
if (j_search(active_p, pfd_p->fd.iod[i].sock) != NULL) {
contacted[i] = 1;
}
}
/* send requests; receive data and acks */
while (!jlist_empty(active_p)) {
if (do_jobs(active_p, &socks, -1) < 0) {
PERROR(SUBSYS_LIB,"do_jobs");
free(contacted);
return(-1);
}
}
/* pass through responses, checking for errors, sizes */
for (i = 0; i < PCOUNT; i++) {
if (contacted[i]) {
if (pfd_p->fd.iod[i].ack.status) {
errno = pfd_p->fd.iod[i].ack.eno;
free(contacted);
return -1;
}
/* update known file size */
calc_file_sz = fsize_to_file_size(pfd_p->fd.iod[i].ack.ack.rw.fsize,
i, pfd_p);
size += pfd_p->fd.iod[i].ack.dsize;
if (calc_file_sz > known_file_sz) {
known_file_sz = calc_file_sz;
}
}
}
/* check for short read */
if (exp_next_off <= known_file_sz) {
/* we definitely did not hit EOF */
if (size < count) {
LOG(stderr, WARNING_MSG, SUBSYS_LIB, " capfs_read: hit hole, read %Ld of %d (everything should be ok)\n",
size, count);
}
pfd_p->fd.off = exp_next_off;
size = count; /* ensure correct return value (size might have hole) */
errno = 0;
}
else {
mack ack;
mreq req;
struct sockaddr saddr;
struct capfs_options opt;
opt.tcp = MGR_USE_TCP;
opt.use_hcache = 0;
/* we know we got a short read. it MIGHT be EOF, or it might just
* be that we hit a hole that happened to extend to the end of our
* region to read. we need to figure out which one happened.
*/
act_last_off = known_file_sz;
/* the quick and dirty way to figure out what happened is to
* stat() the file. a better solution would be to collect the
* remaining sizes from the iods we didn't already talk to.
*/
req.uid = getuid();
req.gid = getgid();
req.type = MGR_FSTAT;
req.dsize = 0;
req.req.fstat.meta = pfd_p->fd.meta;
saddr = pfd_p->fd.meta.mgr;
if (send_mreq_saddr(&opt, &saddr, &req, NULL, &ack, NULL) < 0 || ack.status != 0) {
PERROR(SUBSYS_LIB,"capfs_read: send_mreq_saddr - ");
/* error talking to mgr, but not really critical.
* assume we hit EOF, return what we know.
*/
pfd_p->fd.off = act_last_off;
size = act_last_off - start_off;
}
else {
/* got a response; determine if we hit EOF */
if (ack.ack.fstat.meta.u_stat.st_size > known_file_sz) {
/* the file is in fact bigger than we were told by the
* other iods
*/
known_file_sz = ack.ack.fstat.meta.u_stat.st_size;
}
if (exp_next_off <= known_file_sz) {
/* didn't really hit EOF */
if (size < count) {
LOG(stderr, WARNING_MSG, SUBSYS_LIB, " capfs_read: hit hole, read %Ld of %d (everything should be ok)\n",
size, count);
}
pfd_p->fd.off = exp_next_off;
size = count; /* ensure correct return value */
errno = 0;
}
else {
/* we really did hit EOF; return short read */
if(known_file_sz > start_off)
{
pfd_p->fd.off = known_file_sz;
size = known_file_sz - start_off;
errno = 0;
}
else
{
/* apparently tried to read after seeking beyond EOF;
* keep current offset but do not return any data
*/
pfd_p->fd.off = start_off;
size = 0;
errno = 0;
}
}
}
}
pfd_p->fd.meta.u_stat.atime = time(NULL);
LOG(stderr, DEBUG_MSG, SUBSYS_LIB, "capfs_read: completed %Ld bytes; new offset = %Ld\n", size,
pfd_p->fd.off);
#ifdef STRICT_FDESC_CHECK
if (do_fdesc_check(fd) < 0) {
LOG(stderr, CRITICAL_MSG, SUBSYS_LIB, "check failed at end of capfs_read()\n");
}
#endif
free(contacted);
return(size);
}
