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 "osdep.h"
  18 #include "qemu-common.h"
  19 #include "qemu-config.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     { .name = "handle", .ops = &handle_ops},
  27 };
  28
  29 int qemu_fsdev_add(QemuOpts *opts)
  30 {
  31     struct FsDriverListEntry *fsle;
  32     int i;
  33     const char *fsdev_id = qemu_opts_id(opts);
  34     const char *fsdriver = qemu_opt_get(opts, "fsdriver");
  35     const char *path = qemu_opt_get(opts, "path");
  36     const char *sec_model = qemu_opt_get(opts, "security_model");
  37     const char *writeout = qemu_opt_get(opts, "writeout");
  38
  39
  40     if (!fsdev_id) {
  41         fprintf(stderr, "fsdev: No id specified\n");
  42         return -1;
  43     }
  44
  45     if (fsdriver) {
  46         for (i = 0; i < ARRAY_SIZE(FsDrivers); i++) {
  47             if (strcmp(FsDrivers[i].name, fsdriver) == 0) {
  48                 break;
  49             }
  50         }
  51
  52         if (i == ARRAY_SIZE(FsDrivers)) {
  53             fprintf(stderr, "fsdev: fsdriver %s not found\n", fsdriver);
  54             return -1;
  55         }
  56     } else {
  57         fprintf(stderr, "fsdev: No fsdriver specified\n");
  58         return -1;
  59     }
  60
  61     if (!sec_model) {
  62         fprintf(stderr, "fsdev: No security_model specified.\n");
  63         return -1;
  64     }
  65
  66     if (!path) {
  67         fprintf(stderr, "fsdev: No path specified.\n");
  68         return -1;
  69     }
  70
  71     fsle = g_malloc(sizeof(*fsle));
  72
  73     fsle->fse.fsdev_id = g_strdup(fsdev_id);
  74     fsle->fse.path = g_strdup(path);
  75     fsle->fse.ops = FsDrivers[i].ops;
  76     fsle->fse.export_flags = 0;
  77     if (writeout) {
  78         if (!strcmp(writeout, "immediate")) {
  79             fsle->fse.export_flags |= V9FS_IMMEDIATE_WRITEOUT;
  80         }
  81     }
  82
  83     if (!strcmp(sec_model, "passthrough")) {
  84         fsle->fse.export_flags |= V9FS_SM_PASSTHROUGH;
  85     } else if (!strcmp(sec_model, "mapped")) {
  86         fsle->fse.export_flags |= V9FS_SM_MAPPED;
  87     } else if (!strcmp(sec_model, "none")) {
  88         fsle->fse.export_flags |= V9FS_SM_NONE;
  89     } else {
  90         fprintf(stderr, "Default to security_model=none. You may want"
  91                 " enable advanced security model using "
  92                 "security option:\n\t security_model=passthrough\n\t "
  93                 "security_model=mapped\n");
  94
  95         fsle->fse.export_flags |= V9FS_SM_NONE;
  96     }
  97
  98     QTAILQ_INSERT_TAIL(&fsdriver_entries, fsle, next);
  99     return 0;
 100 }
 101
 102 FsDriverEntry *get_fsdev_fsentry(char *id)
 103 {
 104     if (id) {
 105         struct FsDriverListEntry *fsle;
 106
 107         QTAILQ_FOREACH(fsle, &fsdriver_entries, next) {
 108             if (strcmp(fsle->fse.fsdev_id, id) == 0) {
 109                 return &fsle->fse;
 110             }
 111         }
 112     }
 113     return NULL;
 114 }
 115
 116 static void fsdev_register_config(void)
 117 {
 118     qemu_add_opts(&qemu_fsdev_opts);
 119     qemu_add_opts(&qemu_virtfs_opts);
 120 }
 121 machine_init(fsdev_register_config);
 122