LXR qemu/hw/9pfs/coth.h

   1/*
   2 * 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_9P_COTH_H
  16#define QEMU_9P_COTH_H
  17
  18#include "qemu/thread.h"
  19#include "qemu/coroutine.h"
  20#include "9p.h"
  21
  22/*
  23 * we want to use bottom half because we want to make sure the below
  24 * sequence of events.
  25 *
  26 *   1. Yield the coroutine in the QEMU thread.
  27 *   2. Submit the coroutine to a worker thread.
  28 *   3. Enter the coroutine in the worker thread.
  29 * we cannot swap step 1 and 2, because that would imply worker thread
  30 * can enter coroutine while step1 is still running
  31 */
  32#define v9fs_co_run_in_worker(code_block)                               \
  33    do {                                                                \
  34        QEMUBH *co_bh;                                                  \
  35        co_bh = qemu_bh_new(co_run_in_worker_bh,                        \
  36                            qemu_coroutine_self());                     \
  37        qemu_bh_schedule(co_bh);                                        \
  38        /*                                                              \
  39         * yield in qemu thread and re-enter back                       \
  40         * in worker thread                                             \
  41         */                                                             \
  42        qemu_coroutine_yield();                                         \
  43        qemu_bh_delete(co_bh);                                          \
  44        code_block;                                                     \
  45        /* re-enter back to qemu thread */                              \
  46        qemu_coroutine_yield();                                         \
  47    } while (0)
  48
  49void co_run_in_worker_bh(void *);
  50int coroutine_fn v9fs_co_readlink(V9fsPDU *, V9fsPath *, V9fsString *);
  51int coroutine_fn v9fs_co_readdir(V9fsPDU *, V9fsFidState *, struct dirent **);
  52off_t coroutine_fn v9fs_co_telldir(V9fsPDU *, V9fsFidState *);
  53void coroutine_fn v9fs_co_seekdir(V9fsPDU *, V9fsFidState *, off_t);
  54void coroutine_fn v9fs_co_rewinddir(V9fsPDU *, V9fsFidState *);
  55int coroutine_fn v9fs_co_statfs(V9fsPDU *, V9fsPath *, struct statfs *);
  56int coroutine_fn v9fs_co_lstat(V9fsPDU *, V9fsPath *, struct stat *);
  57int coroutine_fn v9fs_co_chmod(V9fsPDU *, V9fsPath *, mode_t);
  58int coroutine_fn v9fs_co_utimensat(V9fsPDU *, V9fsPath *, struct timespec [2]);
  59int coroutine_fn v9fs_co_chown(V9fsPDU *, V9fsPath *, uid_t, gid_t);
  60int coroutine_fn v9fs_co_truncate(V9fsPDU *, V9fsPath *, off_t);
  61int coroutine_fn v9fs_co_llistxattr(V9fsPDU *, V9fsPath *, void *, size_t);
  62int coroutine_fn v9fs_co_lgetxattr(V9fsPDU *, V9fsPath *,
  63                                   V9fsString *, void *, size_t);
  64int coroutine_fn v9fs_co_mknod(V9fsPDU *, V9fsFidState *, V9fsString *, uid_t,
  65                               gid_t, dev_t, mode_t, struct stat *);
  66int coroutine_fn v9fs_co_mkdir(V9fsPDU *, V9fsFidState *, V9fsString *,
  67                               mode_t, uid_t, gid_t, struct stat *);
  68int coroutine_fn v9fs_co_remove(V9fsPDU *, V9fsPath *);
  69int coroutine_fn v9fs_co_rename(V9fsPDU *, V9fsPath *, V9fsPath *);
  70int coroutine_fn v9fs_co_unlinkat(V9fsPDU *, V9fsPath *, V9fsString *,
  71                                  int flags);
  72int coroutine_fn v9fs_co_renameat(V9fsPDU *, V9fsPath *, V9fsString *,
  73                                  V9fsPath *, V9fsString *);
  74int coroutine_fn v9fs_co_fstat(V9fsPDU *, V9fsFidState *, struct stat *);
  75int coroutine_fn v9fs_co_opendir(V9fsPDU *, V9fsFidState *);
  76int coroutine_fn v9fs_co_open(V9fsPDU *, V9fsFidState *, int);
  77int coroutine_fn v9fs_co_open2(V9fsPDU *, V9fsFidState *, V9fsString *,
  78                               gid_t, int, int, struct stat *);
  79int coroutine_fn v9fs_co_lsetxattr(V9fsPDU *, V9fsPath *, V9fsString *,
  80                                   void *, size_t, int);
  81int coroutine_fn v9fs_co_lremovexattr(V9fsPDU *, V9fsPath *, V9fsString *);
  82int coroutine_fn v9fs_co_closedir(V9fsPDU *, V9fsFidOpenState *);
  83int coroutine_fn v9fs_co_close(V9fsPDU *, V9fsFidOpenState *);
  84int coroutine_fn v9fs_co_fsync(V9fsPDU *, V9fsFidState *, int);
  85int coroutine_fn v9fs_co_symlink(V9fsPDU *, V9fsFidState *, V9fsString *,
  86                                 const char *, gid_t, struct stat *);
  87int coroutine_fn v9fs_co_link(V9fsPDU *, V9fsFidState *,
  88                              V9fsFidState *, V9fsString *);
  89int coroutine_fn v9fs_co_pwritev(V9fsPDU *, V9fsFidState *,
  90                                 struct iovec *, int, int64_t);
  91int coroutine_fn v9fs_co_preadv(V9fsPDU *, V9fsFidState *,
  92                                struct iovec *, int, int64_t);
  93int coroutine_fn v9fs_co_name_to_path(V9fsPDU *, V9fsPath *,
  94                                      const char *, V9fsPath *);
  95int coroutine_fn v9fs_co_st_gen(V9fsPDU *pdu, V9fsPath *path, mode_t,
  96                                V9fsStatDotl *v9stat);
  97
  98#endif
  99