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