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