fsdev/qemu-fsdev.c

   1 /*
   2  * 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 "qemu/osdep.h"
  14 #include "qapi/error.h"
  15 #include "qemu-fsdev.h"
  16 #include "qemu/queue.h"
  17 #include "qemu/config-file.h"
  18 #include "qemu/error-report.h"
  19 #include "qemu/option.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 = "synth", .ops = &synth_ops},
  27     { .name = "proxy", .ops = &proxy_ops},
  28 };
  29
  30 int qemu_fsdev_add(QemuOpts *opts, Error **errp)
  31 {
  32     int i;
  33     struct FsDriverListEntry *fsle;
  34     const char *fsdev_id = qemu_opts_id(opts);
  35     const char *fsdriver = qemu_opt_get(opts, "fsdriver");
  36     const char *writeout = qemu_opt_get(opts, "writeout");
  37     bool ro = qemu_opt_get_bool(opts, "readonly", 0);
  38
  39     if (!fsdev_id) {
  40         error_setg(errp, "fsdev: No id specified");
  41         return -1;
  42     }
  43
  44     if (fsdriver) {
  45         for (i = 0; i < ARRAY_SIZE(FsDrivers); i++) {
  46             if (strcmp(FsDrivers[i].name, fsdriver) == 0) {
  47                 break;
  48             }
  49         }
  50
  51         if (i == ARRAY_SIZE(FsDrivers)) {
  52             error_setg(errp, "fsdev: fsdriver %s not found", fsdriver);
  53             return -1;
  54         }
  55     } else {
  56         error_setg(errp, "fsdev: No fsdriver specified");
  57         return -1;
  58     }
  59
  60     fsle = g_malloc0(sizeof(*fsle));
  61     fsle->fse.fsdev_id = g_strdup(fsdev_id);
  62     fsle->fse.ops = FsDrivers[i].ops;
  63     if (writeout) {
  64         if (!strcmp(writeout, "immediate")) {
  65             fsle->fse.export_flags |= V9FS_IMMEDIATE_WRITEOUT;
  66         }
  67     }
  68     if (ro) {
  69         fsle->fse.export_flags |= V9FS_RDONLY;
  70     } else {
  71         fsle->fse.export_flags &= ~V9FS_RDONLY;
  72     }
  73
  74     if (fsle->fse.ops->parse_opts) {
  75         if (fsle->fse.ops->parse_opts(opts, &fsle->fse, errp)) {
  76             g_free(fsle->fse.fsdev_id);
  77             g_free(fsle);
  78             return -1;
  79         }
  80     }
  81
  82     QTAILQ_INSERT_TAIL(&fsdriver_entries, fsle, next);
  83     return 0;
  84 }
  85
  86 FsDriverEntry *get_fsdev_fsentry(char *id)
  87 {
  88     if (id) {
  89         struct FsDriverListEntry *fsle;
  90
  91         QTAILQ_FOREACH(fsle, &fsdriver_entries, next) {
  92             if (strcmp(fsle->fse.fsdev_id, id) == 0) {
  93                 return &fsle->fse;
  94             }
  95         }
  96     }
  97     return NULL;
  98 }