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 #include "qemu/error-report.h"
  21
  22 static QTAILQ_HEAD(FsDriverEntry_head, FsDriverListEntry) fsdriver_entries =
  23     QTAILQ_HEAD_INITIALIZER(fsdriver_entries);
  24
  25 static FsDriverTable FsDrivers[] = {
  26     { .name = "local", .ops = &local_ops},
  27 #ifdef CONFIG_OPEN_BY_HANDLE
  28     { .name = "handle", .ops = &handle_ops},
  29 #endif
  30     { .name = "synth", .ops = &synth_ops},
  31     { .name = "proxy", .ops = &proxy_ops},
  32 };
  33
  34 int qemu_fsdev_add(QemuOpts *opts)
  35 {
  36     int i;
  37     struct FsDriverListEntry *fsle;
  38     const char *fsdev_id = qemu_opts_id(opts);
  39     const char *fsdriver = qemu_opt_get(opts, "fsdriver");
  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         error_report("fsdev: No id specified");
  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             error_report("fsdev: fsdriver %s not found", fsdriver);
  57             return -1;
  58         }
  59     } else {
  60         error_report("fsdev: No fsdriver specified");
  61         return -1;
  62     }
  63
  64     fsle = g_malloc0(sizeof(*fsle));
  65     fsle->fse.fsdev_id = g_strdup(fsdev_id);
  66     fsle->fse.ops = FsDrivers[i].ops;
  67     if (writeout) {
  68         if (!strcmp(writeout, "immediate")) {
  69             fsle->fse.export_flags |= V9FS_IMMEDIATE_WRITEOUT;
  70         }
  71     }
  72     if (ro) {
  73         fsle->fse.export_flags |= V9FS_RDONLY;
  74     } else {
  75         fsle->fse.export_flags &= ~V9FS_RDONLY;
  76     }
  77
  78     if (fsle->fse.ops->parse_opts) {
  79         if (fsle->fse.ops->parse_opts(opts, &fsle->fse)) {
  80             g_free(fsle->fse.fsdev_id);
  81             g_free(fsle);
  82             return -1;
  83         }
  84     }
  85
  86     QTAILQ_INSERT_TAIL(&fsdriver_entries, fsle, next);
  87     return 0;
  88 }
  89
  90 FsDriverEntry *get_fsdev_fsentry(char *id)
  91 {
  92     if (id) {
  93         struct FsDriverListEntry *fsle;
  94
  95         QTAILQ_FOREACH(fsle, &fsdriver_entries, next) {
  96             if (strcmp(fsle->fse.fsdev_id, id) == 0) {
  97                 return &fsle->fse;
  98             }
  99         }
 100     }
 101     return NULL;
 102 }