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/*
* Virtio 9p backend
*
* Copyright IBM, Corp. 2011
*
* Authors:
* Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include "fsdev/qemu-fsdev.h"
#include "qemu/thread.h"
#include "qemu/coroutine.h"
#include "coth.h"
int v9fs_co_readdir_r(V9fsPDU *pdu, V9fsFidState *fidp, struct dirent *dent,
struct dirent **result)
{
int err;
V9fsState *s = pdu->s;
if (v9fs_request_cancelled(pdu)) {
return -EINTR;
}
v9fs_co_run_in_worker(
{
errno = 0;
err = s->ops->readdir_r(&s->ctx, &fidp->fs, dent, result);
if (!*result && errno) {
err = -errno;
} else {
err = 0;
}
});
return err;
}
off_t v9fs_co_telldir(V9fsPDU *pdu, V9fsFidState *fidp)
{
off_t err;
V9fsState *s = pdu->s;
if (v9fs_request_cancelled(pdu)) {
return -EINTR;
}
v9fs_co_run_in_worker(
{
err = s->ops->telldir(&s->ctx, &fidp->fs);
if (err < 0) {
err = -errno;
}
});
return err;
}
void v9fs_co_seekdir(V9fsPDU *pdu, V9fsFidState *fidp, off_t offset)
{
V9fsState *s = pdu->s;
if (v9fs_request_cancelled(pdu)) {
return;
}
v9fs_co_run_in_worker(
{
s->ops->seekdir(&s->ctx, &fidp->fs, offset);
});
}
void v9fs_co_rewinddir(V9fsPDU *pdu, V9fsFidState *fidp)
{
V9fsState *s = pdu->s;
if (v9fs_request_cancelled(pdu)) {
return;
}
v9fs_co_run_in_worker(
{
s->ops->rewinddir(&s->ctx, &fidp->fs);
});
}
int v9fs_co_mkdir(V9fsPDU *pdu, V9fsFidState *fidp, V9fsString *name,
mode_t mode, uid_t uid, gid_t gid, struct stat *stbuf)
{
int err;
FsCred cred;
V9fsPath path;
V9fsState *s = pdu->s;
if (v9fs_request_cancelled(pdu)) {
return -EINTR;
}
cred_init(&cred);
cred.fc_mode = mode;
cred.fc_uid = uid;
cred.fc_gid = gid;
v9fs_path_read_lock(s);
v9fs_co_run_in_worker(
{
err = s->ops->mkdir(&s->ctx, &fidp->path, name->data, &cred);
if (err < 0) {
err = -errno;
} else {
v9fs_path_init(&path);
err = v9fs_name_to_path(s, &fidp->path, name->data, &path);
if (!err) {
err = s->ops->lstat(&s->ctx, &path, stbuf);
if (err < 0) {
err = -errno;
}
}
v9fs_path_free(&path);
}
});
v9fs_path_unlock(s);
return err;
}
int v9fs_co_opendir(V9fsPDU *pdu, V9fsFidState *fidp)
{
int err;
V9fsState *s = pdu->s;
if (v9fs_request_cancelled(pdu)) {
return -EINTR;
}
v9fs_path_read_lock(s);
v9fs_co_run_in_worker(
{
err = s->ops->opendir(&s->ctx, &fidp->path, &fidp->fs);
if (err < 0) {
err = -errno;
} else {
err = 0;
}
});
v9fs_path_unlock(s);
if (!err) {
total_open_fd++;
if (total_open_fd > open_fd_hw) {
v9fs_reclaim_fd(pdu);
}
}
return err;
}
int v9fs_co_closedir(V9fsPDU *pdu, V9fsFidOpenState *fs)
{
int err;
V9fsState *s = pdu->s;
if (v9fs_request_cancelled(pdu)) {
return -EINTR;
}
v9fs_co_run_in_worker(
{
err = s->ops->closedir(&s->ctx, fs);
if (err < 0) {
err = -errno;
}
});
if (!err) {
total_open_fd--;
}
return err;
}
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