hw/9pfs/codir.c

   1 /*
   2  * 9p backend
   3  *
   4  * Copyright IBM, Corp. 2011
   5  *
   6  * Authors:
   7  *  Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  */
  13
  14 #include "qemu/osdep.h"
  15 #include "fsdev/qemu-fsdev.h"
  16 #include "qemu/thread.h"
  17 #include "qemu/coroutine.h"
  18 #include "coth.h"
  19
  20 int coroutine_fn v9fs_co_readdir(V9fsPDU *pdu, V9fsFidState *fidp,
  21                                  struct dirent **dent)
  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             struct dirent *entry;
  32
  33             errno = 0;
  34             entry = s->ops->readdir(&s->ctx, &fidp->fs);
  35             if (!entry && errno) {
  36                 err = -errno;
  37             } else {
  38                 *dent = entry;
  39                 err = 0;
  40             }
  41         });
  42     return err;
  43 }
  44
  45 off_t v9fs_co_telldir(V9fsPDU *pdu, V9fsFidState *fidp)
  46 {
  47     off_t err;
  48     V9fsState *s = pdu->s;
  49
  50     if (v9fs_request_cancelled(pdu)) {
  51         return -EINTR;
  52     }
  53     v9fs_co_run_in_worker(
  54         {
  55             err = s->ops->telldir(&s->ctx, &fidp->fs);
  56             if (err < 0) {
  57                 err = -errno;
  58             }
  59         });
  60     return err;
  61 }
  62
  63 void coroutine_fn v9fs_co_seekdir(V9fsPDU *pdu, V9fsFidState *fidp,
  64                                   off_t offset)
  65 {
  66     V9fsState *s = pdu->s;
  67     if (v9fs_request_cancelled(pdu)) {
  68         return;
  69     }
  70     v9fs_co_run_in_worker(
  71         {
  72             s->ops->seekdir(&s->ctx, &fidp->fs, offset);
  73         });
  74 }
  75
  76 void coroutine_fn v9fs_co_rewinddir(V9fsPDU *pdu, V9fsFidState *fidp)
  77 {
  78     V9fsState *s = pdu->s;
  79     if (v9fs_request_cancelled(pdu)) {
  80         return;
  81     }
  82     v9fs_co_run_in_worker(
  83         {
  84             s->ops->rewinddir(&s->ctx, &fidp->fs);
  85         });
  86 }
  87
  88 int coroutine_fn v9fs_co_mkdir(V9fsPDU *pdu, V9fsFidState *fidp,
  89                                V9fsString *name, mode_t mode, uid_t uid,
  90                                gid_t gid, struct stat *stbuf)
  91 {
  92     int err;
  93     FsCred cred;
  94     V9fsPath path;
  95     V9fsState *s = pdu->s;
  96
  97     if (v9fs_request_cancelled(pdu)) {
  98         return -EINTR;
  99     }
 100     cred_init(&cred);
 101     cred.fc_mode = mode;
 102     cred.fc_uid = uid;
 103     cred.fc_gid = gid;
 104     v9fs_path_read_lock(s);
 105     v9fs_co_run_in_worker(
 106         {
 107             err = s->ops->mkdir(&s->ctx, &fidp->path, name->data,  &cred);
 108             if (err < 0) {
 109                 err = -errno;
 110             } else {
 111                 v9fs_path_init(&path);
 112                 err = v9fs_name_to_path(s, &fidp->path, name->data, &path);
 113                 if (!err) {
 114                     err = s->ops->lstat(&s->ctx, &path, stbuf);
 115                     if (err < 0) {
 116                         err = -errno;
 117                     }
 118                 }
 119                 v9fs_path_free(&path);
 120             }
 121         });
 122     v9fs_path_unlock(s);
 123     return err;
 124 }
 125
 126 int coroutine_fn v9fs_co_opendir(V9fsPDU *pdu, V9fsFidState *fidp)
 127 {
 128     int err;
 129     V9fsState *s = pdu->s;
 130
 131     if (v9fs_request_cancelled(pdu)) {
 132         return -EINTR;
 133     }
 134     v9fs_path_read_lock(s);
 135     v9fs_co_run_in_worker(
 136         {
 137             err = s->ops->opendir(&s->ctx, &fidp->path, &fidp->fs);
 138             if (err < 0) {
 139                 err = -errno;
 140             } else {
 141                 err = 0;
 142             }
 143         });
 144     v9fs_path_unlock(s);
 145     if (!err) {
 146         total_open_fd++;
 147         if (total_open_fd > open_fd_hw) {
 148             v9fs_reclaim_fd(pdu);
 149         }
 150     }
 151     return err;
 152 }
 153
 154 int coroutine_fn v9fs_co_closedir(V9fsPDU *pdu, V9fsFidOpenState *fs)
 155 {
 156     int err;
 157     V9fsState *s = pdu->s;
 158
 159     if (v9fs_request_cancelled(pdu)) {
 160         return -EINTR;
 161     }
 162     v9fs_co_run_in_worker(
 163         {
 164             err = s->ops->closedir(&s->ctx, fs);
 165             if (err < 0) {
 166                 err = -errno;
 167             }
 168         });
 169     if (!err) {
 170         total_open_fd--;
 171     }
 172     return err;
 173 }