hw/9pfs/codir.c

   1
   2 /*
   3  * Virtio 9p backend
   4  *
   5  * Copyright IBM, Corp. 2011
   6  *
   7  * Authors:
   8  *  Aneesh Kumar K.V <aneesh.kumar@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 #include "fsdev/qemu-fsdev.h"
  16 #include "qemu-thread.h"
  17 #include "qemu-coroutine.h"
  18 #include "virtio-9p-coth.h"
  19
  20 int v9fs_co_readdir_r(V9fsState *s, V9fsFidState *fidp, struct dirent *dent,
  21                       struct dirent **result)
  22 {
  23     int err;
  24
  25     v9fs_co_run_in_worker(
  26         {
  27             errno = 0;
  28             err = s->ops->readdir_r(&s->ctx, fidp->fs.dir, dent, result);
  29             if (!*result && errno) {
  30                 err = -errno;
  31             } else {
  32                 err = 0;
  33             }
  34         });
  35     return err;
  36 }
  37
  38 off_t v9fs_co_telldir(V9fsState *s, V9fsFidState *fidp)
  39 {
  40     off_t err;
  41
  42     v9fs_co_run_in_worker(
  43         {
  44             err = s->ops->telldir(&s->ctx, fidp->fs.dir);
  45             if (err < 0) {
  46                 err = -errno;
  47             }
  48         });
  49     return err;
  50 }
  51
  52 void v9fs_co_seekdir(V9fsState *s, V9fsFidState *fidp, off_t offset)
  53 {
  54     v9fs_co_run_in_worker(
  55         {
  56             s->ops->seekdir(&s->ctx, fidp->fs.dir, offset);
  57         });
  58 }
  59
  60 void v9fs_co_rewinddir(V9fsState *s, V9fsFidState *fidp)
  61 {
  62     v9fs_co_run_in_worker(
  63         {
  64             s->ops->rewinddir(&s->ctx, fidp->fs.dir);
  65         });
  66 }
  67
  68 int v9fs_co_mkdir(V9fsState *s, V9fsFidState *fidp, V9fsString *name,
  69                   mode_t mode, uid_t uid, gid_t gid, struct stat *stbuf)
  70 {
  71     int err;
  72     FsCred cred;
  73     V9fsString fullname;
  74
  75     cred_init(&cred);
  76     cred.fc_mode = mode;
  77     cred.fc_uid = uid;
  78     cred.fc_gid = gid;
  79     v9fs_string_init(&fullname);
  80     qemu_co_rwlock_rdlock(&s->rename_lock);
  81     v9fs_string_sprintf(&fullname, "%s/%s", fidp->path.data, name->data);
  82     v9fs_co_run_in_worker(
  83         {
  84             err = s->ops->mkdir(&s->ctx, fullname.data, &cred);
  85             if (err < 0) {
  86                 err = -errno;
  87             } else {
  88                 err = s->ops->lstat(&s->ctx, fullname.data, stbuf);
  89                 if (err < 0) {
  90                     err = -errno;
  91                 }
  92             }
  93         });
  94     qemu_co_rwlock_unlock(&s->rename_lock);
  95     v9fs_string_free(&fullname);
  96     return err;
  97 }
  98
  99 int v9fs_co_opendir(V9fsState *s, V9fsFidState *fidp)
 100 {
 101     int err;
 102
 103     qemu_co_rwlock_rdlock(&s->rename_lock);
 104     v9fs_co_run_in_worker(
 105         {
 106             fidp->fs.dir = s->ops->opendir(&s->ctx, fidp->path.data);
 107             if (!fidp->fs.dir) {
 108                 err = -errno;
 109             } else {
 110                 err = 0;
 111             }
 112         });
 113     qemu_co_rwlock_unlock(&s->rename_lock);
 114     if (!err) {
 115         total_open_fd++;
 116         if (total_open_fd > open_fd_hw) {
 117             v9fs_reclaim_fd(s);
 118         }
 119     }
 120     return err;
 121 }
 122
 123 int v9fs_co_closedir(V9fsState *s, DIR *dir)
 124 {
 125     int err;
 126
 127     v9fs_co_run_in_worker(
 128         {
 129             err = s->ops->closedir(&s->ctx, dir);
 130             if (err < 0) {
 131                 err = -errno;
 132             }
 133         });
 134     if (!err) {
 135         total_open_fd--;
 136     }
 137     return err;
 138 }