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 "virtio-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
  49extern void co_run_in_worker_bh(void *);
  50extern int v9fs_init_worker_threads(void);
  51extern int v9fs_co_readlink(V9fsPDU *, V9fsPath *, V9fsString *);
  52extern int v9fs_co_readdir_r(V9fsPDU *, V9fsFidState *,
  53                           struct dirent *, struct dirent **result);
  54extern off_t v9fs_co_telldir(V9fsPDU *, V9fsFidState *);
  55extern void v9fs_co_seekdir(V9fsPDU *, V9fsFidState *, off_t);
  56extern void v9fs_co_rewinddir(V9fsPDU *, V9fsFidState *);
  57extern int v9fs_co_statfs(V9fsPDU *, V9fsPath *, struct statfs *);
  58extern int v9fs_co_lstat(V9fsPDU *, V9fsPath *, struct stat *);
  59extern int v9fs_co_chmod(V9fsPDU *, V9fsPath *, mode_t);
  60extern int v9fs_co_utimensat(V9fsPDU *, V9fsPath *, struct timespec [2]);
  61extern int v9fs_co_chown(V9fsPDU *, V9fsPath *, uid_t, gid_t);
  62extern int v9fs_co_truncate(V9fsPDU *, V9fsPath *, off_t);
  63extern int v9fs_co_llistxattr(V9fsPDU *, V9fsPath *, void *, size_t);
  64extern int v9fs_co_lgetxattr(V9fsPDU *, V9fsPath *,
  65                             V9fsString *, void *, size_t);
  66extern int v9fs_co_mknod(V9fsPDU *, V9fsFidState *, V9fsString *, uid_t,
  67                         gid_t, dev_t, mode_t, struct stat *);
  68extern int v9fs_co_mkdir(V9fsPDU *, V9fsFidState *, V9fsString *,
  69                         mode_t, uid_t, gid_t, struct stat *);
  70extern int v9fs_co_remove(V9fsPDU *, V9fsPath *);
  71extern int v9fs_co_rename(V9fsPDU *, V9fsPath *, V9fsPath *);
  72extern int v9fs_co_unlinkat(V9fsPDU *, V9fsPath *, V9fsString *, int flags);
  73extern int v9fs_co_renameat(V9fsPDU *, V9fsPath *, V9fsString *,
  74                            V9fsPath *, V9fsString *);
  75extern int v9fs_co_fstat(V9fsPDU *, V9fsFidState *, struct stat *);
  76extern int v9fs_co_opendir(V9fsPDU *, V9fsFidState *);
  77extern int v9fs_co_open(V9fsPDU *, V9fsFidState *, int);
  78extern int v9fs_co_open2(V9fsPDU *, V9fsFidState *, V9fsString *,
  79                         gid_t, int, int, struct stat *);
  80extern int v9fs_co_lsetxattr(V9fsPDU *, V9fsPath *, V9fsString *,
  81                             void *, size_t, int);
  82extern int v9fs_co_lremovexattr(V9fsPDU *, V9fsPath *, V9fsString *);
  83extern int v9fs_co_closedir(V9fsPDU *, V9fsFidOpenState *);
  84extern int v9fs_co_close(V9fsPDU *, V9fsFidOpenState *);
  85extern int v9fs_co_fsync(V9fsPDU *, V9fsFidState *, int);
  86extern int v9fs_co_symlink(V9fsPDU *, V9fsFidState *, V9fsString *,
  87                           const char *, gid_t, struct stat *);
  88extern int v9fs_co_link(V9fsPDU *, V9fsFidState *,
  89                        V9fsFidState *, V9fsString *);
  90extern int v9fs_co_pwritev(V9fsPDU *, V9fsFidState *,
  91                           struct iovec *, int, int64_t);
  92extern int v9fs_co_preadv(V9fsPDU *, V9fsFidState *,
  93                          struct iovec *, int, int64_t);
  94extern int v9fs_co_name_to_path(V9fsPDU *, V9fsPath *,
  95                                const char *, V9fsPath *);
  96extern int v9fs_co_st_gen(V9fsPDU *pdu, V9fsPath *path, mode_t,
  97                          V9fsStatDotl *v9stat);
  98
  99#endif
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