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