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     { .name = "synth", .ops = &synth_ops},
  28 };
  29
  30 int qemu_fsdev_add(QemuOpts *opts)
  31 {
  32     struct FsDriverListEntry *fsle;
  33     int i;
  34     const char *fsdev_id = qemu_opts_id(opts);
  35     const char *fsdriver = qemu_opt_get(opts, "fsdriver");
  36     const char *path = qemu_opt_get(opts, "path");
  37     const char *sec_model = qemu_opt_get(opts, "security_model");
  38     const char *writeout = qemu_opt_get(opts, "writeout");
  39     bool ro = qemu_opt_get_bool(opts, "readonly", 0);
  40
  41     if (!fsdev_id) {
  42         fprintf(stderr, "fsdev: No id specified\n");
  43         return -1;
  44     }
  45
  46     if (fsdriver) {
  47         for (i = 0; i < ARRAY_SIZE(FsDrivers); i++) {
  48             if (strcmp(FsDrivers[i].name, fsdriver) == 0) {
  49                 break;
  50             }
  51         }
  52
  53         if (i == ARRAY_SIZE(FsDrivers)) {
  54             fprintf(stderr, "fsdev: fsdriver %s not found\n", fsdriver);
  55             return -1;
  56         }
  57     } else {
  58         fprintf(stderr, "fsdev: No fsdriver specified\n");
  59         return -1;
  60     }
  61
  62     if (!strcmp(fsdriver, "local") && !sec_model) {
  63         fprintf(stderr, "security model not specified, "
  64                 "local fs needs security model\nvalid options are:"
  65                 "\tsecurity_model=[passthrough|mapped|none]\n");
  66         return -1;
  67     }
  68
  69     if (strcmp(fsdriver, "local") && sec_model) {
  70         fprintf(stderr, "only local fs driver needs security model\n");
  71         return -1;
  72     }
  73
  74     if (!path) {
  75         fprintf(stderr, "fsdev: No path specified.\n");
  76         return -1;
  77     }
  78
  79     fsle = g_malloc(sizeof(*fsle));
  80
  81     fsle->fse.fsdev_id = g_strdup(fsdev_id);
  82     fsle->fse.path = g_strdup(path);
  83     fsle->fse.ops = FsDrivers[i].ops;
  84     fsle->fse.export_flags = 0;
  85     if (writeout) {
  86         if (!strcmp(writeout, "immediate")) {
  87             fsle->fse.export_flags |= V9FS_IMMEDIATE_WRITEOUT;
  88         }
  89     }
  90     if (ro) {
  91         fsle->fse.export_flags |= V9FS_RDONLY;
  92     } else {
  93         fsle->fse.export_flags &= ~V9FS_RDONLY;
  94     }
  95
  96     if (strcmp(fsdriver, "local")) {
  97         goto done;
  98     }
  99
 100     if (!strcmp(sec_model, "passthrough")) {
 101         fsle->fse.export_flags |= V9FS_SM_PASSTHROUGH;
 102     } else if (!strcmp(sec_model, "mapped")) {
 103         fsle->fse.export_flags |= V9FS_SM_MAPPED;
 104     } else if (!strcmp(sec_model, "none")) {
 105         fsle->fse.export_flags |= V9FS_SM_NONE;
 106     } else {
 107         fprintf(stderr, "Invalid security model %s specified, valid options are"
 108                 "\n\t [passthrough|mapped|none]\n", sec_model);
 109         return -1;
 110     }
 111 done:
 112     QTAILQ_INSERT_TAIL(&fsdriver_entries, fsle, next);
 113     return 0;
 114 }
 115
 116 FsDriverEntry *get_fsdev_fsentry(char *id)
 117 {
 118     if (id) {
 119         struct FsDriverListEntry *fsle;
 120
 121         QTAILQ_FOREACH(fsle, &fsdriver_entries, next) {
 122             if (strcmp(fsle->fse.fsdev_id, id) == 0) {
 123                 return &fsle->fse;
 124             }
 125         }
 126     }
 127     return NULL;
 128 }
 129
 130 static void fsdev_register_config(void)
 131 {
 132     qemu_add_opts(&qemu_fsdev_opts);
 133     qemu_add_opts(&qemu_virtfs_opts);
 134 }
 135 machine_init(fsdev_register_config);
 136