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 "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
  41     if (!fsdev_id) {
  42         error_report("fsdev: No id specified");
  43         return -1;
  44     }
  45
  46     if (fsdriver) {
  47         for (i = 0; i < ARRAY_SIZE(FsDrivers); i++) {
  48             if (strcmp(FsDrivers[i].name, fsdriver) == 0) {
  49                 break;
  50             }
  51         }
  52
  53         if (i == ARRAY_SIZE(FsDrivers)) {
  54             error_report("fsdev: fsdriver %s not found", fsdriver);
  55             return -1;
  56         }
  57     } else {
  58         error_report("fsdev: No fsdriver specified");
  59         return -1;
  60     }
  61
  62     fsle = g_malloc0(sizeof(*fsle));
  63     fsle->fse.fsdev_id = g_strdup(fsdev_id);
  64     fsle->fse.ops = FsDrivers[i].ops;
  65     if (writeout) {
  66         if (!strcmp(writeout, "immediate")) {
  67             fsle->fse.export_flags |= V9FS_IMMEDIATE_WRITEOUT;
  68         }
  69     }
  70     if (ro) {
  71         fsle->fse.export_flags |= V9FS_RDONLY;
  72     } else {
  73         fsle->fse.export_flags &= ~V9FS_RDONLY;
  74     }
  75
  76     if (fsle->fse.ops->parse_opts) {
  77         if (fsle->fse.ops->parse_opts(opts, &fsle->fse)) {
  78             g_free(fsle->fse.fsdev_id);
  79             g_free(fsle);
  80             return -1;
  81         }
  82     }
  83
  84     QTAILQ_INSERT_TAIL(&fsdriver_entries, fsle, next);
  85     return 0;
  86 }
  87
  88 FsDriverEntry *get_fsdev_fsentry(char *id)
  89 {
  90     if (id) {
  91         struct FsDriverListEntry *fsle;
  92
  93         QTAILQ_FOREACH(fsle, &fsdriver_entries, next) {
  94             if (strcmp(fsle->fse.fsdev_id, id) == 0) {
  95                 return &fsle->fse;
  96             }
  97         }
  98     }
  99     return NULL;
 100 }