fsdev/qemu-fsdev.c

   1 /*
   2  * Virtio 9p
   3  *
   4  * Copyright IBM, Corp. 2010
   5  *
   6  * Authors:
   7  *  Gautham R Shenoy <ego@in.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 #include <stdio.h>
  14 #include <string.h>
  15 #include "qemu-fsdev.h"
  16 #include "qemu/queue.h"
  17 #include "qemu/osdep.h"
  18 #include "qemu-common.h"
  19 #include "qemu/config-file.h"
  20
  21 static QTAILQ_HEAD(FsDriverEntry_head, FsDriverListEntry) fsdriver_entries =
  22     QTAILQ_HEAD_INITIALIZER(fsdriver_entries);
  23
  24 static FsDriverTable FsDrivers[] = {
  25     { .name = "local", .ops = &local_ops},
  26 #ifdef CONFIG_OPEN_BY_HANDLE
  27     { .name = "handle", .ops = &handle_ops},
  28 #endif
  29     { .name = "synth", .ops = &synth_ops},
  30     { .name = "proxy", .ops = &proxy_ops},
  31 };
  32
  33 int qemu_fsdev_add(QemuOpts *opts)
  34 {
  35     int i;
  36     struct FsDriverListEntry *fsle;
  37     const char *fsdev_id = qemu_opts_id(opts);
  38     const char *fsdriver = qemu_opt_get(opts, "fsdriver");
  39     const char *writeout = qemu_opt_get(opts, "writeout");
  40     bool ro = qemu_opt_get_bool(opts, "readonly", 0);
  41
  42     if (!fsdev_id) {
  43         fprintf(stderr, "fsdev: No id specified\n");
  44         return -1;
  45     }
  46
  47     if (fsdriver) {
  48         for (i = 0; i < ARRAY_SIZE(FsDrivers); i++) {
  49             if (strcmp(FsDrivers[i].name, fsdriver) == 0) {
  50                 break;
  51             }
  52         }
  53
  54         if (i == ARRAY_SIZE(FsDrivers)) {
  55             fprintf(stderr, "fsdev: fsdriver %s not found\n", fsdriver);
  56             return -1;
  57         }
  58     } else {
  59         fprintf(stderr, "fsdev: No fsdriver specified\n");
  60         return -1;
  61     }
  62
  63     fsle = g_malloc0(sizeof(*fsle));
  64     fsle->fse.fsdev_id = g_strdup(fsdev_id);
  65     fsle->fse.ops = FsDrivers[i].ops;
  66     if (writeout) {
  67         if (!strcmp(writeout, "immediate")) {
  68             fsle->fse.export_flags |= V9FS_IMMEDIATE_WRITEOUT;
  69         }
  70     }
  71     if (ro) {
  72         fsle->fse.export_flags |= V9FS_RDONLY;
  73     } else {
  74         fsle->fse.export_flags &= ~V9FS_RDONLY;
  75     }
  76
  77     if (fsle->fse.ops->parse_opts) {
  78         if (fsle->fse.ops->parse_opts(opts, &fsle->fse)) {
  79             g_free(fsle->fse.fsdev_id);
  80             g_free(fsle);
  81             return -1;
  82         }
  83     }
  84
  85     QTAILQ_INSERT_TAIL(&fsdriver_entries, fsle, next);
  86     return 0;
  87 }
  88
  89 FsDriverEntry *get_fsdev_fsentry(char *id)
  90 {
  91     if (id) {
  92         struct FsDriverListEntry *fsle;
  93
  94         QTAILQ_FOREACH(fsle, &fsdriver_entries, next) {
  95             if (strcmp(fsle->fse.fsdev_id, id) == 0) {
  96                 return &fsle->fse;
  97             }
  98         }
  99     }
 100     return NULL;
 101 }