LXR qemu/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
  20int 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
  45off_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
  63void 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
  76void 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
  88int 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
 126int 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
 154int 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}
 174