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 "qemu-fsdev.h"
  15 #include "qemu/queue.h"
  16 #include "qemu-common.h"
  17 #include "qemu/config-file.h"
  18 #include "qemu/error-report.h"
  19
  20 static QTAILQ_HEAD(FsDriverEntry_head, FsDriverListEntry) fsdriver_entries =
  21     QTAILQ_HEAD_INITIALIZER(fsdriver_entries);
  22
  23 static FsDriverTable FsDrivers[] = {
  24     { .name = "local", .ops = &local_ops},
  25 #ifdef CONFIG_OPEN_BY_HANDLE
  26     { .name = "handle", .ops = &handle_ops},
  27 #endif
  28     { .name = "synth", .ops = &synth_ops},
  29     { .name = "proxy", .ops = &proxy_ops},
  30 };
  31
  32 int qemu_fsdev_add(QemuOpts *opts)
  33 {
  34     int i;
  35     struct FsDriverListEntry *fsle;
  36     const char *fsdev_id = qemu_opts_id(opts);
  37     const char *fsdriver = qemu_opt_get(opts, "fsdriver");
  38     const char *writeout = qemu_opt_get(opts, "writeout");
  39     bool ro = qemu_opt_get_bool(opts, "readonly", 0);
  40     Error *local_err = NULL;
  41
  42     if (!fsdev_id) {
  43         error_report("fsdev: No id specified");
  44         return -1;
  45     }
  46
  47     if (fsdriver) {
  48         for (i = 0; i < ARRAY_SIZE(FsDrivers); i++) {
  49             if (strcmp(FsDrivers[i].name, fsdriver) == 0) {
  50                 break;
  51             }
  52         }
  53
  54         if (i == ARRAY_SIZE(FsDrivers)) {
  55             error_report("fsdev: fsdriver %s not found", fsdriver);
  56             return -1;
  57         }
  58     } else {
  59         error_report("fsdev: No fsdriver specified");
  60         return -1;
  61     }
  62
  63     fsle = g_malloc0(sizeof(*fsle));
  64     fsle->fse.fsdev_id = g_strdup(fsdev_id);
  65     fsle->fse.ops = FsDrivers[i].ops;
  66     if (writeout) {
  67         if (!strcmp(writeout, "immediate")) {
  68             fsle->fse.export_flags |= V9FS_IMMEDIATE_WRITEOUT;
  69         }
  70     }
  71     if (ro) {
  72         fsle->fse.export_flags |= V9FS_RDONLY;
  73     } else {
  74         fsle->fse.export_flags &= ~V9FS_RDONLY;
  75     }
  76
  77     if (fsle->fse.ops->parse_opts) {
  78         if (fsle->fse.ops->parse_opts(opts, &fsle->fse, &local_err)) {
  79             error_report_err(local_err);
  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 }