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 "qemu/main-loop.h"
  19#include "coth.h"
  20
  21int 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
  46off_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
  64void 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
  77void 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
  89int 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
 127int 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
 155int 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}
 175