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 "block/coroutine.h"
  18 #include "virtio-9p-coth.h"
  19
  20 int v9fs_co_readdir_r(V9fsPDU *pdu, V9fsFidState *fidp, struct dirent *dent,
  21                       struct dirent **result)
  22 {
  23     int err;
  24     V9fsState *s = pdu->s;
  25
  26     if (v9fs_request_cancelled(pdu)) {
  27         return -EINTR;
  28     }
  29     v9fs_co_run_in_worker(
  30         {
  31             errno = 0;
  32             err = s->ops->readdir_r(&s->ctx, &fidp->fs, dent, result);
  33             if (!*result && errno) {
  34                 err = -errno;
  35             } else {
  36                 err = 0;
  37             }
  38         });
  39     return err;
  40 }
  41
  42 off_t v9fs_co_telldir(V9fsPDU *pdu, V9fsFidState *fidp)
  43 {
  44     off_t err;
  45     V9fsState *s = pdu->s;
  46
  47     if (v9fs_request_cancelled(pdu)) {
  48         return -EINTR;
  49     }
  50     v9fs_co_run_in_worker(
  51         {
  52             err = s->ops->telldir(&s->ctx, &fidp->fs);
  53             if (err < 0) {
  54                 err = -errno;
  55             }
  56         });
  57     return err;
  58 }
  59
  60 void v9fs_co_seekdir(V9fsPDU *pdu, V9fsFidState *fidp, off_t offset)
  61 {
  62     V9fsState *s = pdu->s;
  63     if (v9fs_request_cancelled(pdu)) {
  64         return;
  65     }
  66     v9fs_co_run_in_worker(
  67         {
  68             s->ops->seekdir(&s->ctx, &fidp->fs, offset);
  69         });
  70 }
  71
  72 void v9fs_co_rewinddir(V9fsPDU *pdu, V9fsFidState *fidp)
  73 {
  74     V9fsState *s = pdu->s;
  75     if (v9fs_request_cancelled(pdu)) {
  76         return;
  77     }
  78     v9fs_co_run_in_worker(
  79         {
  80             s->ops->rewinddir(&s->ctx, &fidp->fs);
  81         });
  82 }
  83
  84 int v9fs_co_mkdir(V9fsPDU *pdu, V9fsFidState *fidp, V9fsString *name,
  85                   mode_t mode, uid_t uid, gid_t gid, struct stat *stbuf)
  86 {
  87     int err;
  88     FsCred cred;
  89     V9fsPath path;
  90     V9fsState *s = pdu->s;
  91
  92     if (v9fs_request_cancelled(pdu)) {
  93         return -EINTR;
  94     }
  95     cred_init(&cred);
  96     cred.fc_mode = mode;
  97     cred.fc_uid = uid;
  98     cred.fc_gid = gid;
  99     v9fs_path_read_lock(s);
 100     v9fs_co_run_in_worker(
 101         {
 102             err = s->ops->mkdir(&s->ctx, &fidp->path, name->data,  &cred);
 103             if (err < 0) {
 104                 err = -errno;
 105             } else {
 106                 v9fs_path_init(&path);
 107                 err = v9fs_name_to_path(s, &fidp->path, name->data, &path);
 108                 if (!err) {
 109                     err = s->ops->lstat(&s->ctx, &path, stbuf);
 110                     if (err < 0) {
 111                         err = -errno;
 112                     }
 113                 }
 114                 v9fs_path_free(&path);
 115             }
 116         });
 117     v9fs_path_unlock(s);
 118     return err;
 119 }
 120
 121 int v9fs_co_opendir(V9fsPDU *pdu, V9fsFidState *fidp)
 122 {
 123     int err;
 124     V9fsState *s = pdu->s;
 125
 126     if (v9fs_request_cancelled(pdu)) {
 127         return -EINTR;
 128     }
 129     v9fs_path_read_lock(s);
 130     v9fs_co_run_in_worker(
 131         {
 132             err = s->ops->opendir(&s->ctx, &fidp->path, &fidp->fs);
 133             if (err < 0) {
 134                 err = -errno;
 135             } else {
 136                 err = 0;
 137             }
 138         });
 139     v9fs_path_unlock(s);
 140     if (!err) {
 141         total_open_fd++;
 142         if (total_open_fd > open_fd_hw) {
 143             v9fs_reclaim_fd(pdu);
 144         }
 145     }
 146     return err;
 147 }
 148
 149 int v9fs_co_closedir(V9fsPDU *pdu, V9fsFidOpenState *fs)
 150 {
 151     int err;
 152     V9fsState *s = pdu->s;
 153
 154     if (v9fs_request_cancelled(pdu)) {
 155         return -EINTR;
 156     }
 157     v9fs_co_run_in_worker(
 158         {
 159             err = s->ops->closedir(&s->ctx, fs);
 160             if (err < 0) {
 161                 err = -errno;
 162             }
 163         });
 164     if (!err) {
 165         total_open_fd--;
 166     }
 167     return err;
 168 }