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/*

 * Virtio 9p backend

 *

 * Copyright IBM, Corp. 2010

 *

 * Authors:

 *  Harsh Prateek Bora <harsh@linux.vnet.ibm.com>

 *  Venkateswararao Jujjuri(JV) <jvrao@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.

 *

 */

#ifndef _QEMU_VIRTIO_9P_COTH_H

#define _QEMU_VIRTIO_9P_COTH_H

#include "qemu-thread.h"

#include "qemu-coroutine.h"

#include "virtio-9p.h"

#include <glib.h>

typedef struct V9fsThPool {

    int rfd;

    int wfd;

    GThreadPool *pool;

    GAsyncQueue *completed;

} V9fsThPool;

/*

 * we want to use bottom half because we want to make sure the below

 * sequence of events.

 *

 *   1. Yield the coroutine in the QEMU thread.

 *   2. Submit the coroutine to a worker thread.

 *   3. Enter the coroutine in the worker thread.

 * we cannot swap step 1 and 2, because that would imply worker thread

 * can enter coroutine while step1 is still running

 */

#define v9fs_co_run_in_worker(code_block)                               \

    do {                                                                \

        QEMUBH *co_bh;                                                  \

        co_bh = qemu_bh_new(co_run_in_worker_bh,                        \

                            qemu_coroutine_self());                     \

        qemu_bh_schedule(co_bh);                                        \

        /*                                                              \

         * yeild in qemu thread and re-enter back                       \

         * in glib worker thread                                        \

         */                                                             \

        qemu_coroutine_yield();                                         \

        qemu_bh_delete(co_bh);                                          \

        code_block;                                                     \

        /* re-enter back to qemu thread */                              \

        qemu_coroutine_yield();                                         \

    } while (0)

extern void co_run_in_worker_bh(void *);

extern int v9fs_init_worker_threads(void);

extern int v9fs_co_readlink(V9fsState *, V9fsString *, V9fsString *);

extern int v9fs_co_readdir_r(V9fsState *, V9fsFidState *,

                           struct dirent *, struct dirent **result);

extern off_t v9fs_co_telldir(V9fsState *, V9fsFidState *);

extern void v9fs_co_seekdir(V9fsState *, V9fsFidState *, off_t);

extern void v9fs_co_rewinddir(V9fsState *, V9fsFidState *);

extern int v9fs_co_statfs(V9fsState *, V9fsString *, struct statfs *);

extern int v9fs_co_lstat(V9fsState *, V9fsString *, struct stat *);

extern int v9fs_co_chmod(V9fsState *, V9fsString *, mode_t);

extern int v9fs_co_utimensat(V9fsState *, V9fsString *, struct timespec [2]);

extern int v9fs_co_chown(V9fsState *, V9fsString *, uid_t, gid_t);

extern int v9fs_co_truncate(V9fsState *, V9fsString *, off_t);

extern int v9fs_co_llistxattr(V9fsState *, V9fsString *, void *, size_t);

extern int v9fs_co_lgetxattr(V9fsState *, V9fsString *,

                             V9fsString *, void *, size_t);

extern int v9fs_co_mknod(V9fsState *, V9fsString *, uid_t,

                         gid_t, dev_t, mode_t);

extern int v9fs_co_mkdir(V9fsState *, char *, mode_t, uid_t, gid_t);

extern int v9fs_co_remove(V9fsState *, V9fsString *);

extern int v9fs_co_rename(V9fsState *, V9fsString *, V9fsString *);

extern int v9fs_co_fstat(V9fsState *, int, struct stat *);

extern int v9fs_co_opendir(V9fsState *, V9fsFidState *);

extern int v9fs_co_open(V9fsState *, V9fsFidState *, int);

extern int v9fs_co_open2(V9fsState *, V9fsFidState *, char *, gid_t, int, int);

extern int v9fs_co_lsetxattr(V9fsState *, V9fsString *, V9fsString *,

                             void *, size_t, int);

extern int v9fs_co_lremovexattr(V9fsState *, V9fsString *, V9fsString *);

extern int v9fs_co_closedir(V9fsState *, DIR *);

extern int v9fs_co_close(V9fsState *, int);

extern int v9fs_co_fsync(V9fsState *, V9fsFidState *, int);

extern int v9fs_co_symlink(V9fsState *, V9fsFidState *, const char *,

                           const char *, gid_t);

extern int v9fs_co_link(V9fsState *, V9fsString *, V9fsString *);

extern int v9fs_co_pwritev(V9fsState *, V9fsFidState *,

                           struct iovec *, int, int64_t);

extern int v9fs_co_preadv(V9fsState *, V9fsFidState *,

                          struct iovec *, int, int64_t);

#endif