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     bool ro = qemu_opt_get_bool(opts, "readonly", 0);
  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 (!strcmp(fsdriver, "local") && !sec_model) {
  62         fprintf(stderr, "security model not specified, "
  63                 "local fs needs security model\nvalid options are:"
  64                 "\tsecurity_model=[passthrough|mapped|none]\n");
  65         return -1;
  66     }
  67
  68     if (strcmp(fsdriver, "local") && sec_model) {
  69         fprintf(stderr, "only local fs driver needs security model\n");
  70         return -1;
  71     }
  72
  73     if (!path) {
  74         fprintf(stderr, "fsdev: No path specified.\n");
  75         return -1;
  76     }
  77
  78     fsle = g_malloc(sizeof(*fsle));
  79
  80     fsle->fse.fsdev_id = g_strdup(fsdev_id);
  81     fsle->fse.path = g_strdup(path);
  82     fsle->fse.ops = FsDrivers[i].ops;
  83     fsle->fse.export_flags = 0;
  84     if (writeout) {
  85         if (!strcmp(writeout, "immediate")) {
  86             fsle->fse.export_flags |= V9FS_IMMEDIATE_WRITEOUT;
  87         }
  88     }
  89     if (ro) {
  90         fsle->fse.export_flags |= V9FS_RDONLY;
  91     } else {
  92         fsle->fse.export_flags &= ~V9FS_RDONLY;
  93     }
  94
  95     if (strcmp(fsdriver, "local")) {
  96         goto done;
  97     }
  98
  99     if (!strcmp(sec_model, "passthrough")) {
 100         fsle->fse.export_flags |= V9FS_SM_PASSTHROUGH;
 101     } else if (!strcmp(sec_model, "mapped")) {
 102         fsle->fse.export_flags |= V9FS_SM_MAPPED;
 103     } else if (!strcmp(sec_model, "none")) {
 104         fsle->fse.export_flags |= V9FS_SM_NONE;
 105     } else {
 106         fprintf(stderr, "Invalid security model %s specified, valid options are"
 107                 "\n\t [passthrough|mapped|none]\n", sec_model);
 108         return -1;
 109     }
 110 done:
 111     QTAILQ_INSERT_TAIL(&fsdriver_entries, fsle, next);
 112     return 0;
 113 }
 114
 115 FsDriverEntry *get_fsdev_fsentry(char *id)
 116 {
 117     if (id) {
 118         struct FsDriverListEntry *fsle;
 119
 120         QTAILQ_FOREACH(fsle, &fsdriver_entries, next) {
 121             if (strcmp(fsle->fse.fsdev_id, id) == 0) {
 122                 return &fsle->fse;
 123             }
 124         }
 125     }
 126     return NULL;
 127 }
 128
 129 static void fsdev_register_config(void)
 130 {
 131     qemu_add_opts(&qemu_fsdev_opts);
 132     qemu_add_opts(&qemu_virtfs_opts);
 133 }
 134 machine_init(fsdev_register_config);
 135