LXR qemu/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
  21static QTAILQ_HEAD(FsDriverEntry_head, FsDriverListEntry) fsdriver_entries =
  22    QTAILQ_HEAD_INITIALIZER(fsdriver_entries);
  23
  24static 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    { .name = "proxy", .ops = &proxy_ops},
  31};
  32
  33int qemu_fsdev_add(QemuOpts *opts, Error **errp)
  34{
  35    int i;
  36    struct FsDriverListEntry *fsle;
  37    const char *fsdev_id = qemu_opts_id(opts);
  38    const char *fsdriver = qemu_opt_get(opts, "fsdriver");
  39    const char *writeout = qemu_opt_get(opts, "writeout");
  40    bool ro = qemu_opt_get_bool(opts, "readonly", 0);
  41
  42    if (!fsdev_id) {
  43        error_setg(errp, "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_setg(errp, "fsdev: fsdriver %s not found", fsdriver);
  56            return -1;
  57        }
  58    } else {
  59        error_setg(errp, "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, errp)) {
  79            g_free(fsle->fse.fsdev_id);
  80            g_free(fsle);
  81            return -1;
  82        }
  83    }
  84
  85    QTAILQ_INSERT_TAIL(&fsdriver_entries, fsle, next);
  86    return 0;
  87}
  88
  89FsDriverEntry *get_fsdev_fsentry(char *id)
  90{
  91    if (id) {
  92        struct FsDriverListEntry *fsle;
  93
  94        QTAILQ_FOREACH(fsle, &fsdriver_entries, next) {
  95            if (strcmp(fsle->fse.fsdev_id, id) == 0) {
  96                return &fsle->fse;
  97            }
  98        }
  99    }
 100    return NULL;
 101}
 102