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 "qemu/main-loop.h"
  19 #include "coth.h"
  20
  21 int coroutine_fn v9fs_co_readdir(V9fsPDU *pdu, V9fsFidState *fidp,
  22                                  struct dirent **dent)
  23 {
  24     int err;
  25     V9fsState *s = pdu->s;
  26
  27     if (v9fs_request_cancelled(pdu)) {
  28         return -EINTR;
  29     }
  30     v9fs_co_run_in_worker(
  31         {
  32             struct dirent *entry;
  33
  34             errno = 0;
  35             entry = s->ops->readdir(&s->ctx, &fidp->fs);
  36             if (!entry && errno) {
  37                 err = -errno;
  38             } else {
  39                 *dent = entry;
  40                 err = 0;
  41             }
  42         });
  43     return err;
  44 }
  45
  46 off_t v9fs_co_telldir(V9fsPDU *pdu, V9fsFidState *fidp)
  47 {
  48     off_t err;
  49     V9fsState *s = pdu->s;
  50
  51     if (v9fs_request_cancelled(pdu)) {
  52         return -EINTR;
  53     }
  54     v9fs_co_run_in_worker(
  55         {
  56             err = s->ops->telldir(&s->ctx, &fidp->fs);
  57             if (err < 0) {
  58                 err = -errno;
  59             }
  60         });
  61     return err;
  62 }
  63
  64 void coroutine_fn v9fs_co_seekdir(V9fsPDU *pdu, V9fsFidState *fidp,
  65                                   off_t offset)
  66 {
  67     V9fsState *s = pdu->s;
  68     if (v9fs_request_cancelled(pdu)) {
  69         return;
  70     }
  71     v9fs_co_run_in_worker(
  72         {
  73             s->ops->seekdir(&s->ctx, &fidp->fs, offset);
  74         });
  75 }
  76
  77 void coroutine_fn v9fs_co_rewinddir(V9fsPDU *pdu, V9fsFidState *fidp)
  78 {
  79     V9fsState *s = pdu->s;
  80     if (v9fs_request_cancelled(pdu)) {
  81         return;
  82     }
  83     v9fs_co_run_in_worker(
  84         {
  85             s->ops->rewinddir(&s->ctx, &fidp->fs);
  86         });
  87 }
  88
  89 int coroutine_fn v9fs_co_mkdir(V9fsPDU *pdu, V9fsFidState *fidp,
  90                                V9fsString *name, mode_t mode, uid_t uid,
  91                                gid_t gid, struct stat *stbuf)
  92 {
  93     int err;
  94     FsCred cred;
  95     V9fsPath path;
  96     V9fsState *s = pdu->s;
  97
  98     if (v9fs_request_cancelled(pdu)) {
  99         return -EINTR;
 100     }
 101     cred_init(&cred);
 102     cred.fc_mode = mode;
 103     cred.fc_uid = uid;
 104     cred.fc_gid = gid;
 105     v9fs_path_read_lock(s);
 106     v9fs_co_run_in_worker(
 107         {
 108             err = s->ops->mkdir(&s->ctx, &fidp->path, name->data,  &cred);
 109             if (err < 0) {
 110                 err = -errno;
 111             } else {
 112                 v9fs_path_init(&path);
 113                 err = v9fs_name_to_path(s, &fidp->path, name->data, &path);
 114                 if (!err) {
 115                     err = s->ops->lstat(&s->ctx, &path, stbuf);
 116                     if (err < 0) {
 117                         err = -errno;
 118                     }
 119                 }
 120                 v9fs_path_free(&path);
 121             }
 122         });
 123     v9fs_path_unlock(s);
 124     return err;
 125 }
 126
 127 int coroutine_fn v9fs_co_opendir(V9fsPDU *pdu, V9fsFidState *fidp)
 128 {
 129     int err;
 130     V9fsState *s = pdu->s;
 131
 132     if (v9fs_request_cancelled(pdu)) {
 133         return -EINTR;
 134     }
 135     v9fs_path_read_lock(s);
 136     v9fs_co_run_in_worker(
 137         {
 138             err = s->ops->opendir(&s->ctx, &fidp->path, &fidp->fs);
 139             if (err < 0) {
 140                 err = -errno;
 141             } else {
 142                 err = 0;
 143             }
 144         });
 145     v9fs_path_unlock(s);
 146     if (!err) {
 147         total_open_fd++;
 148         if (total_open_fd > open_fd_hw) {
 149             v9fs_reclaim_fd(pdu);
 150         }
 151     }
 152     return err;
 153 }
 154
 155 int coroutine_fn v9fs_co_closedir(V9fsPDU *pdu, V9fsFidOpenState *fs)
 156 {
 157     int err;
 158     V9fsState *s = pdu->s;
 159
 160     if (v9fs_request_cancelled(pdu)) {
 161         return -EINTR;
 162     }
 163     v9fs_co_run_in_worker(
 164         {
 165             err = s->ops->closedir(&s->ctx, fs);
 166             if (err < 0) {
 167                 err = -errno;
 168             }
 169         });
 170     if (!err) {
 171         total_open_fd--;
 172     }
 173     return err;
 174 }