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 #ifdef CONFIG_OPEN_BY_HANDLE
  27     { .name = "handle", .ops = &handle_ops},
  28 #endif
  29     { .name = "synth", .ops = &synth_ops},
  30 };
  31
  32 int qemu_fsdev_add(QemuOpts *opts)
  33 {
  34     struct FsDriverListEntry *fsle;
  35     int i;
  36     const char *fsdev_id = qemu_opts_id(opts);
  37     const char *fsdriver = qemu_opt_get(opts, "fsdriver");
  38     const char *path = qemu_opt_get(opts, "path");
  39     const char *sec_model = qemu_opt_get(opts, "security_model");
  40     const char *writeout = qemu_opt_get(opts, "writeout");
  41     bool ro = qemu_opt_get_bool(opts, "readonly", 0);
  42
  43     if (!fsdev_id) {
  44         fprintf(stderr, "fsdev: No id specified\n");
  45         return -1;
  46     }
  47
  48     if (fsdriver) {
  49         for (i = 0; i < ARRAY_SIZE(FsDrivers); i++) {
  50             if (strcmp(FsDrivers[i].name, fsdriver) == 0) {
  51                 break;
  52             }
  53         }
  54
  55         if (i == ARRAY_SIZE(FsDrivers)) {
  56             fprintf(stderr, "fsdev: fsdriver %s not found\n", fsdriver);
  57             return -1;
  58         }
  59     } else {
  60         fprintf(stderr, "fsdev: No fsdriver specified\n");
  61         return -1;
  62     }
  63
  64     if (!strcmp(fsdriver, "local") && !sec_model) {
  65         fprintf(stderr, "security model not specified, "
  66                 "local fs needs security model\nvalid options are:"
  67                 "\tsecurity_model=[passthrough|mapped|none]\n");
  68         return -1;
  69     }
  70
  71     if (strcmp(fsdriver, "local") && sec_model) {
  72         fprintf(stderr, "only local fs driver needs security model\n");
  73         return -1;
  74     }
  75
  76     if (!path) {
  77         fprintf(stderr, "fsdev: No path specified.\n");
  78         return -1;
  79     }
  80
  81     fsle = g_malloc(sizeof(*fsle));
  82
  83     fsle->fse.fsdev_id = g_strdup(fsdev_id);
  84     fsle->fse.path = g_strdup(path);
  85     fsle->fse.ops = FsDrivers[i].ops;
  86     fsle->fse.export_flags = 0;
  87     if (writeout) {
  88         if (!strcmp(writeout, "immediate")) {
  89             fsle->fse.export_flags |= V9FS_IMMEDIATE_WRITEOUT;
  90         }
  91     }
  92     if (ro) {
  93         fsle->fse.export_flags |= V9FS_RDONLY;
  94     } else {
  95         fsle->fse.export_flags &= ~V9FS_RDONLY;
  96     }
  97
  98     if (strcmp(fsdriver, "local")) {
  99         goto done;
 100     }
 101
 102     if (!strcmp(sec_model, "passthrough")) {
 103         fsle->fse.export_flags |= V9FS_SM_PASSTHROUGH;
 104     } else if (!strcmp(sec_model, "mapped")) {
 105         fsle->fse.export_flags |= V9FS_SM_MAPPED;
 106     } else if (!strcmp(sec_model, "none")) {
 107         fsle->fse.export_flags |= V9FS_SM_NONE;
 108     } else {
 109         fprintf(stderr, "Invalid security model %s specified, valid options are"
 110                 "\n\t [passthrough|mapped|none]\n", sec_model);
 111         return -1;
 112     }
 113 done:
 114     QTAILQ_INSERT_TAIL(&fsdriver_entries, fsle, next);
 115     return 0;
 116 }
 117
 118 FsDriverEntry *get_fsdev_fsentry(char *id)
 119 {
 120     if (id) {
 121         struct FsDriverListEntry *fsle;
 122
 123         QTAILQ_FOREACH(fsle, &fsdriver_entries, next) {
 124             if (strcmp(fsle->fse.fsdev_id, id) == 0) {
 125                 return &fsle->fse;
 126             }
 127         }
 128     }
 129     return NULL;
 130 }
 131
 132 static void fsdev_register_config(void)
 133 {
 134     qemu_add_opts(&qemu_fsdev_opts);
 135     qemu_add_opts(&qemu_virtfs_opts);
 136 }
 137 machine_init(fsdev_register_config);
 138