hw/9pfs/virtio-9p-coth.h

   1 /*
   2  * Virtio 9p backend
   3  *
   4  * Copyright IBM, Corp. 2010
   5  *
   6  * Authors:
   7  *  Harsh Prateek Bora <harsh@linux.vnet.ibm.com>
   8  *  Venkateswararao Jujjuri(JV) <jvrao@linux.vnet.ibm.com>
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2.  See
  11  * the COPYING file in the top-level directory.
  12  *
  13  */
  14
  15 #ifndef _QEMU_VIRTIO_9P_COTH_H
  16 #define _QEMU_VIRTIO_9P_COTH_H
  17
  18 #include "qemu-thread.h"
  19 #include "qemu-coroutine.h"
  20 #include "virtio-9p.h"
  21 #include <glib.h>
  22
  23 typedef struct V9fsThPool {
  24     int rfd;
  25     int wfd;
  26     GThreadPool *pool;
  27     GAsyncQueue *completed;
  28 } V9fsThPool;
  29
  30 /*
  31  * we want to use bottom half because we want to make sure the below
  32  * sequence of events.
  33  *
  34  *   1. Yield the coroutine in the QEMU thread.
  35  *   2. Submit the coroutine to a worker thread.
  36  *   3. Enter the coroutine in the worker thread.
  37  * we cannot swap step 1 and 2, because that would imply worker thread
  38  * can enter coroutine while step1 is still running
  39  */
  40 #define v9fs_co_run_in_worker(code_block)                               \
  41     do {                                                                \
  42         QEMUBH *co_bh;                                                  \
  43         co_bh = qemu_bh_new(co_run_in_worker_bh,                        \
  44                             qemu_coroutine_self());                     \
  45         qemu_bh_schedule(co_bh);                                        \
  46         /*                                                              \
  47          * yeild in qemu thread and re-enter back                       \
  48          * in glib worker thread                                        \
  49          */                                                             \
  50         qemu_coroutine_yield();                                         \
  51         qemu_bh_delete(co_bh);                                          \
  52         code_block;                                                     \
  53         /* re-enter back to qemu thread */                              \
  54         qemu_coroutine_yield();                                         \
  55     } while (0)
  56
  57 extern void co_run_in_worker_bh(void *);
  58 extern int v9fs_init_worker_threads(void);
  59 extern int v9fs_co_readlink(V9fsState *, V9fsString *, V9fsString *);
  60 extern int v9fs_co_readdir(V9fsState *, V9fsFidState *,
  61                            struct dirent **);
  62 extern off_t v9fs_co_telldir(V9fsState *, V9fsFidState *);
  63 extern void v9fs_co_seekdir(V9fsState *, V9fsFidState *, off_t);
  64 extern void v9fs_co_rewinddir(V9fsState *, V9fsFidState *);
  65 extern int v9fs_co_statfs(V9fsState *, V9fsString *, struct statfs *);
  66 extern int v9fs_co_lstat(V9fsState *, V9fsString *, struct stat *);
  67 extern int v9fs_co_chmod(V9fsState *, V9fsString *, mode_t);
  68 extern int v9fs_co_utimensat(V9fsState *, V9fsString *, struct timespec [2]);
  69 extern int v9fs_co_chown(V9fsState *, V9fsString *, uid_t, gid_t);
  70 extern int v9fs_co_truncate(V9fsState *, V9fsString *, off_t);
  71 extern int v9fs_co_llistxattr(V9fsState *, V9fsString *, void *, size_t);
  72 extern int v9fs_co_lgetxattr(V9fsState *, V9fsString *,
  73                              V9fsString *, void *, size_t);
  74 extern int v9fs_co_mknod(V9fsState *, V9fsString *, uid_t,
  75                          gid_t, dev_t, mode_t);
  76 extern int v9fs_co_mkdir(V9fsState *, char *, mode_t, uid_t, gid_t);
  77 extern int v9fs_co_remove(V9fsState *, V9fsString *);
  78 extern int v9fs_co_rename(V9fsState *, V9fsString *, V9fsString *);
  79 #endif