-
-/**
- * This is the entry point for the mount call into Lustre.
- * This is called when a server or client is mounted,
- * and this is where we start setting things up.
- * @param data Mount options (e.g. -o flock,abort_recov)
- */
-static int lustre_fill_super(struct super_block *sb, void *lmd2_data,
- int silent)
-{
- struct lustre_mount_data *lmd;
- struct lustre_sb_info *lsi;
- int rc;
-
- ENTRY;
-
- CDEBUG(D_MOUNT|D_VFSTRACE, "VFS Op: sb %p\n", sb);
-
- lsi = lustre_init_lsi(sb);
- if (!lsi)
- RETURN(-ENOMEM);
- lmd = lsi->lsi_lmd;
-
- /*
- * Disable lockdep during mount, because mount locking patterns are
- * 'special'.
- */
- lockdep_off();
-
- /*
- * LU-639: the OBD cleanup of last mount may not finish yet, wait here.
- */
- obd_zombie_barrier();
-
- /* Figure out the lmd from the mount options */
- if (lmd_parse(lmd2_data, lmd)) {
- lustre_put_lsi(sb);
- GOTO(out, rc = -EINVAL);
- }
-
- if (lmd_is_client(lmd)) {
- bool have_client = false;
-
- CDEBUG(D_MOUNT, "Mounting client %s\n", lmd->lmd_profile);
- if (!client_fill_super)
- request_module("lustre");
- spin_lock(&client_lock);
- if (client_fill_super && try_module_get(client_mod))
- have_client = true;
- spin_unlock(&client_lock);
- if (!have_client) {
- LCONSOLE_ERROR_MSG(0x165,
- "Nothing registered for client mount! Is the 'lustre' module loaded?\n");
- lustre_put_lsi(sb);
- rc = -ENODEV;
- } else {
- rc = lustre_start_mgc(sb);
- if (rc) {
- lustre_common_put_super(sb);
- GOTO(out, rc);
- }
- /* Connect and start */
- /* (should always be ll_fill_super) */
- rc = (*client_fill_super)(sb);
- /* c_f_s will call lustre_common_put_super on failure,
- * which takes care of the module reference.
- */
- }
- } else {
-#ifdef HAVE_SERVER_SUPPORT
- CDEBUG(D_MOUNT, "Mounting server from %s\n", lmd->lmd_dev);
- rc = server_fill_super(sb);
- /*
- * s_f_s calls lustre_start_mgc after the mount because we need
- * the MGS NIDs which are stored on disk. Plus, we may
- * need to start the MGS first.
- */
- /* s_f_s will call server_put_super on failure */
-#else
- CERROR("client-side-only module, cannot handle server mount\n");
- rc = -EINVAL;
-#endif
- }
-
- /*
- * If error happens in fill_super() call, @lsi will be killed there.
- * This is why we do not put it here.
- */
- GOTO(out, rc);
-out:
- if (rc) {
- CERROR("Unable to mount %s (%d)\n",
- s2lsi(sb) ? lmd->lmd_dev : "", rc);
- } else {
- CDEBUG(D_SUPER, "Mount %s complete\n",
- lmd->lmd_dev);
- }
- lockdep_on();
- return rc;
-}
-
-
-/*
- * We can't call ll_fill_super by name because it lives in a module that
- * must be loaded after this one.
- */
-void lustre_register_super_ops(struct module *mod,
- int (*cfs)(struct super_block *sb),
- void (*ksc)(struct super_block *sb))
-{
- spin_lock(&client_lock);
- client_mod = mod;
- client_fill_super = cfs;
- kill_super_cb = ksc;
- spin_unlock(&client_lock);
-}
-EXPORT_SYMBOL(lustre_register_super_ops);
-
-/***************** FS registration ******************/
-static struct dentry *lustre_mount(struct file_system_type *fs_type, int flags,
- const char *devname, void *data)
-{
- return mount_nodev(fs_type, flags, data, lustre_fill_super);
-}
-
-static void lustre_kill_super(struct super_block *sb)
-{
- struct lustre_sb_info *lsi = s2lsi(sb);
-
- if (kill_super_cb && lsi && !IS_SERVER(lsi))
- (*kill_super_cb)(sb);
-
- kill_anon_super(sb);
-}
-
-#ifdef HAVE_SERVER_SUPPORT
-/* Register the "lustre_tgt" fs type.
- *
- * Right now this isn't any different than the normal "lustre" filesystem
- * type, but it is added so that there is some compatibility to allow
- * changing documentation and scripts to start using the "lustre_tgt" type
- * at mount time. That will simplify test interop, and in case of upgrades
- * that change to the new type and then need to roll back for some reason.
- *
- * The long-term goal is to disentangle the client and server mount code.
- */
-static struct file_system_type lustre_fs_type_tgt = {
- .owner = THIS_MODULE,
- .name = "lustre_tgt",
- .mount = lustre_mount,
- .kill_sb = lustre_kill_super,
- .fs_flags = FS_REQUIRES_DEV | FS_RENAME_DOES_D_MOVE,
-};
-MODULE_ALIAS_FS("lustre_tgt");
-
-#define register_filesystem_tgt(fstype) \
-do { \
- int _rc; \
- \
- _rc = register_filesystem(fstype); \
- if (_rc && _rc != -EBUSY) { \
- /* Don't fail if server code also registers "lustre_tgt" */ \
- CERROR("obdclass: register fstype '%s' failed: rc = %d\n", \
- (fstype)->name, _rc); \
- return _rc; \
- } \
-} while (0)
-#define unregister_filesystem_tgt(fstype) unregister_filesystem(fstype)
-#else
-#define register_filesystem_tgt(fstype) do {} while (0)
-#define unregister_filesystem_tgt(fstype) do {} while (0)
-#endif
-
-/* Register the "lustre" fs type */
-static struct file_system_type lustre_fs_type = {
- .owner = THIS_MODULE,
- .name = "lustre",
- .mount = lustre_mount,
- .kill_sb = lustre_kill_super,
- .fs_flags = FS_RENAME_DOES_D_MOVE,
-};
-MODULE_ALIAS_FS("lustre");
-
-int lustre_register_fs(void)
-{
- register_filesystem_tgt(&lustre_fs_type_tgt);
-
- return register_filesystem(&lustre_fs_type);
-}
-
-int lustre_unregister_fs(void)
-{
- unregister_filesystem_tgt(&lustre_fs_type_tgt);
-
- return unregister_filesystem(&lustre_fs_type);
-}