hw/9pfs: Add file descriptor reclaim support

[qemu.git] / hw / 9pfs / codir.c

/*
 * Virtio 9p backend
 *
 * Copyright IBM, Corp. 2011
 *
 * Authors:
 *  Aneesh Kumar K.V <[email protected]>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
 */

#include "fsdev/qemu-fsdev.h"
#include "qemu-thread.h"
#include "qemu-coroutine.h"
#include "virtio-9p-coth.h"

int v9fs_co_readdir_r(V9fsState *s, V9fsFidState *fidp, struct dirent *dent,
                      struct dirent **result)
{
    int err;

    v9fs_co_run_in_worker(
        {
            errno = 0;
            err = s->ops->readdir_r(&s->ctx, fidp->fs.dir, dent, result);
            if (!*result && errno) {
                err = -errno;
            } else {
                err = 0;
            }
        });
    return err;
}

off_t v9fs_co_telldir(V9fsState *s, V9fsFidState *fidp)
{
    off_t err;

    v9fs_co_run_in_worker(
        {
            err = s->ops->telldir(&s->ctx, fidp->fs.dir);
            if (err < 0) {
                err = -errno;
            }
        });
    return err;
}

void v9fs_co_seekdir(V9fsState *s, V9fsFidState *fidp, off_t offset)
{
    v9fs_co_run_in_worker(
        {
            s->ops->seekdir(&s->ctx, fidp->fs.dir, offset);
        });
}

void v9fs_co_rewinddir(V9fsState *s, V9fsFidState *fidp)
{
    v9fs_co_run_in_worker(
        {
            s->ops->rewinddir(&s->ctx, fidp->fs.dir);
        });
}

int v9fs_co_mkdir(V9fsState *s, char *name, mode_t mode, uid_t uid, gid_t gid)
{
    int err;
    FsCred cred;

    cred_init(&cred);
    cred.fc_mode = mode;
    cred.fc_uid = uid;
    cred.fc_gid = gid;
    v9fs_co_run_in_worker(
        {
            err = s->ops->mkdir(&s->ctx, name, &cred);
            if (err < 0) {
                err = -errno;
            }
        });
    return err;
}

int v9fs_co_opendir(V9fsState *s, V9fsFidState *fidp)
{
    int err;

    v9fs_co_run_in_worker(
        {
            fidp->fs.dir = s->ops->opendir(&s->ctx, fidp->path.data);
            if (!fidp->fs.dir) {
                err = -errno;
            } else {
                err = 0;
            }
        });
    return err;
}

int v9fs_co_closedir(V9fsState *s, DIR *dir)
{
    int err;

    v9fs_co_run_in_worker(
        {
            err = s->ops->closedir(&s->ctx, dir);
            if (err < 0) {
                err = -errno;
            }
        });
    return err;
}