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