/* * GPL HEADER START * * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 only, * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License version 2 for more details (a copy is included * in the LICENSE file that accompanied this code). * * You should have received a copy of the GNU General Public License * version 2 along with this program; If not, see * http://www.gnu.org/licenses/gpl-2.0.html * * GPL HEADER END */ /* * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. * Use is subject to license terms. * * Copyright (c) 2011, 2017, Intel Corporation. */ /* * This file is part of Lustre, http://www.lustre.org/ * Lustre is a trademark of Sun Microsystems, Inc. * * lustre/obdclass/obd_mount.c * * Client mount routines * * Author: Nathan Rutman */ #define DEBUG_SUBSYSTEM S_CLASS #define D_MOUNT (D_SUPER|D_CONFIG/*|D_WARNING */) #define PRINT_CMD CDEBUG #include #include #include #include #include #include #include #include #include static DEFINE_SPINLOCK(client_lock); static struct module *client_mod; static int (*client_fill_super)(struct super_block *sb); static void (*kill_super_cb)(struct super_block *sb); /**************** config llog ********************/ /** * Get a config log from the MGS and process it. * This func is called for both clients and servers. * Continue to process new statements appended to the logs * (whenever the config lock is revoked) until lustre_end_log * is called. * * @param sb The superblock is used by the MGC to write to the local copy of * the config log * @param logname The name of the llog to replicate from the MGS * @param cfg Since the same MGC may be used to follow multiple config logs * (e.g. ost1, ost2, client), the config_llog_instance keeps the state for * this log, and is added to the mgc's list of logs to follow. */ int lustre_process_log(struct super_block *sb, char *logname, struct config_llog_instance *cfg) { struct lustre_cfg *lcfg; struct lustre_cfg_bufs *bufs; struct lustre_sb_info *lsi = s2lsi(sb); struct obd_device *mgc = lsi->lsi_mgc; int rc; ENTRY; LASSERT(mgc); LASSERT(cfg); OBD_ALLOC_PTR(bufs); if (bufs == NULL) RETURN(-ENOMEM); /* mgc_process_config */ lustre_cfg_bufs_reset(bufs, mgc->obd_name); lustre_cfg_bufs_set_string(bufs, 1, logname); lustre_cfg_bufs_set(bufs, 2, cfg, sizeof(*cfg)); lustre_cfg_bufs_set(bufs, 3, &sb, sizeof(sb)); OBD_ALLOC(lcfg, lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen)); if (!lcfg) GOTO(out, rc = -ENOMEM); lustre_cfg_init(lcfg, LCFG_LOG_START, bufs); rc = obd_process_config(mgc, sizeof(*lcfg), lcfg); OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens)); out: OBD_FREE_PTR(bufs); if (rc == -EINVAL) LCONSOLE_ERROR_MSG(0x15b, "%s: Configuration from log %s failed from MGS %d. Check client and MGS are on compatible version.\n", mgc->obd_name, logname, rc); else if (rc != 0) LCONSOLE_ERROR_MSG(0x15c, "%s: Confguration from log %s failed from MGS %d. Communication error between node & MGS, a bad configuration, or other errors. See syslog for more info\n", mgc->obd_name, logname, rc); /* class_obd_list(); */ RETURN(rc); } EXPORT_SYMBOL(lustre_process_log); /* Stop watching this config log for updates */ int lustre_end_log(struct super_block *sb, char *logname, struct config_llog_instance *cfg) { struct lustre_cfg *lcfg; struct lustre_cfg_bufs bufs; struct lustre_sb_info *lsi = s2lsi(sb); struct obd_device *mgc = lsi->lsi_mgc; int rc; ENTRY; if (!mgc) RETURN(-ENOENT); /* mgc_process_config */ lustre_cfg_bufs_reset(&bufs, mgc->obd_name); lustre_cfg_bufs_set_string(&bufs, 1, logname); if (cfg) lustre_cfg_bufs_set(&bufs, 2, cfg, sizeof(*cfg)); OBD_ALLOC(lcfg, lustre_cfg_len(bufs.lcfg_bufcount, bufs.lcfg_buflen)); if (!lcfg) RETURN(-ENOMEM); lustre_cfg_init(lcfg, LCFG_LOG_END, &bufs); rc = obd_process_config(mgc, sizeof(*lcfg), lcfg); OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens)); RETURN(rc); } EXPORT_SYMBOL(lustre_end_log); /**************** OBD start *******************/ /** * lustre_cfg_bufs are a holdover from 1.4; we can still set these up from * lctl (and do for echo cli/srv. */ static int do_lcfg(char *cfgname, lnet_nid_t nid, int cmd, char *s1, char *s2, char *s3, char *s4) { struct lustre_cfg_bufs bufs; struct lustre_cfg *lcfg = NULL; int rc; CDEBUG(D_TRACE, "lcfg %s %#x %s %s %s %s\n", cfgname, cmd, s1, s2, s3, s4); lustre_cfg_bufs_reset(&bufs, cfgname); if (s1) lustre_cfg_bufs_set_string(&bufs, 1, s1); if (s2) lustre_cfg_bufs_set_string(&bufs, 2, s2); if (s3) lustre_cfg_bufs_set_string(&bufs, 3, s3); if (s4) lustre_cfg_bufs_set_string(&bufs, 4, s4); OBD_ALLOC(lcfg, lustre_cfg_len(bufs.lcfg_bufcount, bufs.lcfg_buflen)); if (!lcfg) return -ENOMEM; lustre_cfg_init(lcfg, cmd, &bufs); lcfg->lcfg_nid = nid; rc = class_process_config(lcfg); OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens)); return rc; } /** * Call class_attach and class_setup. These methods in turn call * OBD type-specific methods. */ int lustre_start_simple(char *obdname, char *type, char *uuid, char *s1, char *s2, char *s3, char *s4) { int rc; CDEBUG(D_MOUNT, "Starting OBD %s (typ=%s)\n", obdname, type); rc = do_lcfg(obdname, 0, LCFG_ATTACH, type, uuid, NULL, NULL); if (rc) { CERROR("%s attach error %d\n", obdname, rc); return rc; } rc = do_lcfg(obdname, 0, LCFG_SETUP, s1, s2, s3, s4); if (rc) { CERROR("%s setup error %d\n", obdname, rc); do_lcfg(obdname, 0, LCFG_DETACH, NULL, NULL, NULL, NULL); } return rc; } static DEFINE_MUTEX(mgc_start_lock); /** * Set up a MGC OBD to process startup logs * * \param sb [in] super block of the MGC OBD * * \retval 0 success, otherwise error code */ int lustre_start_mgc(struct super_block *sb) { struct obd_connect_data *data = NULL; struct lustre_sb_info *lsi = s2lsi(sb); struct obd_device *obd; struct obd_export *exp; struct obd_uuid *uuid = NULL; uuid_t uuidc; lnet_nid_t nid; char nidstr[LNET_NIDSTR_SIZE]; char *mgcname = NULL, *niduuid = NULL, *mgssec = NULL; char *ptr; int rc = 0, i = 0, j; size_t len; ENTRY; LASSERT(lsi->lsi_lmd); /* Find the first non-lo MGS NID for our MGC name */ if (IS_SERVER(lsi)) { /* mount -o mgsnode=nid */ ptr = lsi->lsi_lmd->lmd_mgs; if (lsi->lsi_lmd->lmd_mgs && (class_parse_nid(lsi->lsi_lmd->lmd_mgs, &nid, &ptr) == 0)) { i++; } else if (IS_MGS(lsi)) { struct lnet_process_id id; while ((rc = LNetGetId(i++, &id)) != -ENOENT) { if (id.nid == LNET_NID_LO_0) continue; nid = id.nid; i++; break; } } } else { /* client */ /* Use NIDs from mount line: uml1,1@elan:uml2,2@elan:/lustre */ ptr = lsi->lsi_lmd->lmd_dev; if (class_parse_nid(ptr, &nid, &ptr) == 0) i++; } if (i == 0) { CERROR("No valid MGS NIDs found.\n"); RETURN(-EINVAL); } mutex_lock(&mgc_start_lock); libcfs_nid2str_r(nid, nidstr, sizeof(nidstr)); len = strlen(LUSTRE_MGC_OBDNAME) + strlen(nidstr) + 1; OBD_ALLOC(mgcname, len); OBD_ALLOC(niduuid, len + 2); if (mgcname == NULL || niduuid == NULL) GOTO(out_free, rc = -ENOMEM); snprintf(mgcname, len, "%s%s", LUSTRE_MGC_OBDNAME, nidstr); mgssec = lsi->lsi_lmd->lmd_mgssec ? lsi->lsi_lmd->lmd_mgssec : ""; OBD_ALLOC_PTR(data); if (data == NULL) GOTO(out_free, rc = -ENOMEM); obd = class_name2obd(mgcname); if (obd && !obd->obd_stopping) { int recov_bk; rc = obd_set_info_async(NULL, obd->obd_self_export, strlen(KEY_MGSSEC), KEY_MGSSEC, strlen(mgssec), mgssec, NULL); if (rc) GOTO(out_free, rc); /* Re-using an existing MGC */ atomic_inc(&obd->u.cli.cl_mgc_refcount); /* IR compatibility check, only for clients */ if (lmd_is_client(lsi->lsi_lmd)) { int has_ir; int vallen = sizeof(*data); __u32 *flags = &lsi->lsi_lmd->lmd_flags; rc = obd_get_info(NULL, obd->obd_self_export, strlen(KEY_CONN_DATA), KEY_CONN_DATA, &vallen, data); LASSERT(rc == 0); has_ir = OCD_HAS_FLAG(data, IMP_RECOV); if (has_ir ^ !(*flags & LMD_FLG_NOIR)) { /* LMD_FLG_NOIR is for test purpose only */ LCONSOLE_WARN( "Mounting client with IR setting not compatible with current MGC. Using MGC setting that is IR %s", has_ir ? "enabled" : "disabled"); if (has_ir) *flags &= ~LMD_FLG_NOIR; else *flags |= LMD_FLG_NOIR; } } recov_bk = 0; /* * If we are restarting the MGS, don't try to keep the MGC's * old connection, or registration will fail. */ if (IS_MGS(lsi)) { CDEBUG(D_MOUNT, "New MGS with live MGC\n"); recov_bk = 1; } /* * Try all connections, but only once (again). * We don't want to block another target from starting * (using its local copy of the log), but we do want to connect * if at all possible. */ recov_bk++; CDEBUG(D_MOUNT, "%s:Set MGC reconnect %d\n", mgcname, recov_bk); rc = obd_set_info_async(NULL, obd->obd_self_export, sizeof(KEY_INIT_RECOV_BACKUP), KEY_INIT_RECOV_BACKUP, sizeof(recov_bk), &recov_bk, NULL); GOTO(out, rc = 0); } CDEBUG(D_MOUNT, "Start MGC '%s'\n", mgcname); /* Add the primary NIDs for the MGS */ i = 0; snprintf(niduuid, len + 2, "%s_%x", mgcname, i); if (IS_SERVER(lsi)) { ptr = lsi->lsi_lmd->lmd_mgs; CDEBUG(D_MOUNT, "mgs NIDs %s.\n", ptr); if (IS_MGS(lsi)) { /* Use local NIDs (including LO) */ struct lnet_process_id id; while ((rc = LNetGetId(i++, &id)) != -ENOENT) { rc = do_lcfg(mgcname, id.nid, LCFG_ADD_UUID, niduuid, NULL, NULL, NULL); } } else { /* Use mgsnode= nids */ /* mount -o mgsnode=nid */ if (lsi->lsi_lmd->lmd_mgs) { ptr = lsi->lsi_lmd->lmd_mgs; } else if (class_find_param(ptr, PARAM_MGSNODE, &ptr) != 0) { CERROR("No MGS NIDs given.\n"); GOTO(out_free, rc = -EINVAL); } /* * Add primary MGS NID(s). * Multiple NIDs on one MGS node are separated * by commas. */ while (class_parse_nid(ptr, &nid, &ptr) == 0) { rc = do_lcfg(mgcname, nid, LCFG_ADD_UUID, niduuid, NULL, NULL, NULL); if (rc == 0) ++i; /* Stop at the first failover NID */ if (*ptr == ':') break; } } } else { /* client */ /* Use NIDs from mount line: uml1,1@elan:uml2,2@elan:/lustre */ ptr = lsi->lsi_lmd->lmd_dev; while (class_parse_nid(ptr, &nid, &ptr) == 0) { rc = do_lcfg(mgcname, nid, LCFG_ADD_UUID, niduuid, NULL, NULL, NULL); if (rc == 0) ++i; /* Stop at the first failover NID */ if (*ptr == ':') break; } } if (i == 0) { CERROR("No valid MGS NIDs found.\n"); GOTO(out_free, rc = -EINVAL); } lsi->lsi_lmd->lmd_mgs_failnodes = 1; /* Random uuid for MGC allows easier reconnects */ OBD_ALLOC_PTR(uuid); if (uuid == NULL) GOTO(out_free, rc = -ENOMEM); generate_random_uuid(uuidc.b); snprintf(uuid->uuid, sizeof(*uuid), "%pU", uuidc.b); /* Start the MGC */ rc = lustre_start_simple(mgcname, LUSTRE_MGC_NAME, (char *)uuid->uuid, LUSTRE_MGS_OBDNAME, niduuid, NULL, NULL); if (rc) GOTO(out_free, rc); /* Add any failover MGS NIDs */ i = 1; while (ptr && ((*ptr == ':' || class_find_param(ptr, PARAM_MGSNODE, &ptr) == 0))) { /* New failover node */ sprintf(niduuid, "%s_%x", mgcname, i); j = 0; while (class_parse_nid_quiet(ptr, &nid, &ptr) == 0) { rc = do_lcfg(mgcname, nid, LCFG_ADD_UUID, niduuid, NULL, NULL, NULL); if (rc == 0) ++j; if (*ptr == ':') break; } if (j > 0) { rc = do_lcfg(mgcname, 0, LCFG_ADD_CONN, niduuid, NULL, NULL, NULL); if (rc == 0) ++i; } else { /* at ":/fsname" */ break; } } lsi->lsi_lmd->lmd_mgs_failnodes = i; obd = class_name2obd(mgcname); if (!obd) { CERROR("Can't find mgcobd %s\n", mgcname); GOTO(out_free, rc = -ENOTCONN); } rc = obd_set_info_async(NULL, obd->obd_self_export, strlen(KEY_MGSSEC), KEY_MGSSEC, strlen(mgssec), mgssec, NULL); if (rc) GOTO(out_free, rc); /* * Keep a refcount of servers/clients who started with "mount", * so we know when we can get rid of the mgc. */ atomic_set(&obd->u.cli.cl_mgc_refcount, 1); /* We connect to the MGS at setup, and don't disconnect until cleanup */ data->ocd_connect_flags = OBD_CONNECT_VERSION | OBD_CONNECT_AT | OBD_CONNECT_FULL20 | OBD_CONNECT_IMP_RECOV | OBD_CONNECT_LVB_TYPE | OBD_CONNECT_BULK_MBITS | OBD_CONNECT_BARRIER; if (lmd_is_client(lsi->lsi_lmd) && lsi->lsi_lmd->lmd_flags & LMD_FLG_NOIR) data->ocd_connect_flags &= ~OBD_CONNECT_IMP_RECOV; data->ocd_version = LUSTRE_VERSION_CODE; rc = obd_connect(NULL, &exp, obd, uuid, data, NULL); if (rc) { CERROR("connect failed %d\n", rc); GOTO(out, rc); } obd->u.cli.cl_mgc_mgsexp = exp; out: /* * Keep the MGC info in the sb. Note that many lsi's can point * to the same mgc. */ lsi->lsi_mgc = obd; out_free: mutex_unlock(&mgc_start_lock); if (uuid) OBD_FREE_PTR(uuid); if (data) OBD_FREE_PTR(data); if (mgcname) OBD_FREE(mgcname, len); if (niduuid) OBD_FREE(niduuid, len + 2); RETURN(rc); } static int lustre_stop_mgc(struct super_block *sb) { struct lustre_sb_info *lsi = s2lsi(sb); struct obd_device *obd; char *niduuid = NULL, *ptr = NULL; int i, rc = 0, len = 0; ENTRY; if (!lsi) RETURN(-ENOENT); obd = lsi->lsi_mgc; if (!obd) RETURN(-ENOENT); lsi->lsi_mgc = NULL; mutex_lock(&mgc_start_lock); LASSERT(atomic_read(&obd->u.cli.cl_mgc_refcount) > 0); if (!atomic_dec_and_test(&obd->u.cli.cl_mgc_refcount)) { /* * This is not fatal, every client that stops * will call in here. */ CDEBUG(D_MOUNT, "MGC still has %d references.\n", atomic_read(&obd->u.cli.cl_mgc_refcount)); GOTO(out, rc = -EBUSY); } /* * The MGC has no recoverable data in any case. * force shotdown set in umount_begin */ obd->obd_no_recov = 1; if (obd->u.cli.cl_mgc_mgsexp) { /* * An error is not fatal, if we are unable to send the * disconnect mgs ping evictor cleans up the export */ rc = obd_disconnect(obd->u.cli.cl_mgc_mgsexp); if (rc) CDEBUG(D_MOUNT, "disconnect failed %d\n", rc); } /* * Save the obdname for cleaning the nid uuids, which are * obdname_XX */ len = strlen(obd->obd_name) + 6; OBD_ALLOC(niduuid, len); if (niduuid) { strcpy(niduuid, obd->obd_name); ptr = niduuid + strlen(niduuid); } rc = class_manual_cleanup(obd); if (rc) GOTO(out, rc); /* Clean the nid uuids */ if (!niduuid) GOTO(out, rc = -ENOMEM); for (i = 0; i < lsi->lsi_lmd->lmd_mgs_failnodes; i++) { sprintf(ptr, "_%x", i); rc = do_lcfg(LUSTRE_MGC_OBDNAME, 0, LCFG_DEL_UUID, niduuid, NULL, NULL, NULL); if (rc) CERROR("del MDC UUID %s failed: rc = %d\n", niduuid, rc); } out: if (niduuid) OBD_FREE(niduuid, len); /* class_import_put will get rid of the additional connections */ mutex_unlock(&mgc_start_lock); RETURN(rc); } /***************** lustre superblock **************/ static struct lustre_sb_info *lustre_init_lsi(struct super_block *sb) { struct lustre_sb_info *lsi; ENTRY; OBD_ALLOC_PTR(lsi); if (!lsi) RETURN(NULL); OBD_ALLOC_PTR(lsi->lsi_lmd); if (!lsi->lsi_lmd) { OBD_FREE_PTR(lsi); RETURN(NULL); } s2lsi_nocast(sb) = lsi; /* we take 1 extra ref for our setup */ atomic_set(&lsi->lsi_mounts, 1); /* Default umount style */ lsi->lsi_flags = LSI_UMOUNT_FAILOVER; INIT_LIST_HEAD(&lsi->lsi_lwp_list); mutex_init(&lsi->lsi_lwp_mutex); RETURN(lsi); } static int lustre_free_lsi(struct super_block *sb) { struct lustre_sb_info *lsi = s2lsi(sb); ENTRY; LASSERT(lsi != NULL); CDEBUG(D_MOUNT, "Freeing lsi %p\n", lsi); /* someone didn't call server_put_mount. */ LASSERT(atomic_read(&lsi->lsi_mounts) == 0); llcrypt_sb_free(sb); if (lsi->lsi_lmd != NULL) { if (lsi->lsi_lmd->lmd_dev != NULL) OBD_FREE(lsi->lsi_lmd->lmd_dev, strlen(lsi->lsi_lmd->lmd_dev) + 1); if (lsi->lsi_lmd->lmd_profile != NULL) OBD_FREE(lsi->lsi_lmd->lmd_profile, strlen(lsi->lsi_lmd->lmd_profile) + 1); if (lsi->lsi_lmd->lmd_fileset != NULL) OBD_FREE(lsi->lsi_lmd->lmd_fileset, strlen(lsi->lsi_lmd->lmd_fileset) + 1); if (lsi->lsi_lmd->lmd_mgssec != NULL) OBD_FREE(lsi->lsi_lmd->lmd_mgssec, strlen(lsi->lsi_lmd->lmd_mgssec) + 1); if (lsi->lsi_lmd->lmd_opts != NULL) OBD_FREE(lsi->lsi_lmd->lmd_opts, strlen(lsi->lsi_lmd->lmd_opts) + 1); if (lsi->lsi_lmd->lmd_exclude_count) OBD_FREE(lsi->lsi_lmd->lmd_exclude, sizeof(lsi->lsi_lmd->lmd_exclude[0]) * lsi->lsi_lmd->lmd_exclude_count); if (lsi->lsi_lmd->lmd_mgs != NULL) OBD_FREE(lsi->lsi_lmd->lmd_mgs, strlen(lsi->lsi_lmd->lmd_mgs) + 1); if (lsi->lsi_lmd->lmd_osd_type != NULL) OBD_FREE(lsi->lsi_lmd->lmd_osd_type, strlen(lsi->lsi_lmd->lmd_osd_type) + 1); if (lsi->lsi_lmd->lmd_params != NULL) OBD_FREE(lsi->lsi_lmd->lmd_params, 4096); if (lsi->lsi_lmd->lmd_nidnet != NULL) OBD_FREE(lsi->lsi_lmd->lmd_nidnet, strlen(lsi->lsi_lmd->lmd_nidnet) + 1); OBD_FREE_PTR(lsi->lsi_lmd); } LASSERT(lsi->lsi_llsbi == NULL); OBD_FREE_PTR(lsi); s2lsi_nocast(sb) = NULL; RETURN(0); } /* * The lsi has one reference for every server that is using the disk - * e.g. MDT, MGS, and potentially MGC */ int lustre_put_lsi(struct super_block *sb) { struct lustre_sb_info *lsi = s2lsi(sb); ENTRY; LASSERT(lsi != NULL); CDEBUG(D_MOUNT, "put %p %d\n", sb, atomic_read(&lsi->lsi_mounts)); if (atomic_dec_and_test(&lsi->lsi_mounts)) { if (IS_SERVER(lsi) && lsi->lsi_osd_exp) { lu_device_put(&lsi->lsi_dt_dev->dd_lu_dev); lsi->lsi_osd_exp->exp_obd->obd_lvfs_ctxt.dt = NULL; lsi->lsi_dt_dev = NULL; obd_disconnect(lsi->lsi_osd_exp); /* wait till OSD is gone */ obd_zombie_barrier(); } lustre_free_lsi(sb); RETURN(1); } RETURN(0); } EXPORT_SYMBOL(lustre_put_lsi); /* * The goal of this function is to extract the file system name * from the OBD name. This can come in two flavors. One is * fsname-MDTXXXX or fsname-XXXXXXX were X is a hexadecimal * number. In both cases we should return fsname. If it is * not a valid OBD name it is assumed to be the file system * name itself. */ void obdname2fsname(const char *tgt, char *fsname, size_t buflen) { const char *ptr; const char *tmp; size_t len = 0; /* * First we have to see if the @tgt has '-' at all. It is * valid for the user to request something like * lctl set_param -P llite.lustre*.xattr_cache=0 */ ptr = strrchr(tgt, '-'); if (!ptr) { /* No '-' means it could end in '*' */ ptr = strchr(tgt, '*'); if (!ptr) { /* No '*' either. Assume tgt = fsname */ len = strlen(tgt); goto valid_obd_name; } len = ptr - tgt; goto valid_obd_name; } /* tgt format fsname-MDT0000-* */ if ((!strncmp(ptr, "-MDT", 4) || !strncmp(ptr, "-OST", 4)) && (isxdigit(ptr[4]) && isxdigit(ptr[5]) && isxdigit(ptr[6]) && isxdigit(ptr[7]))) { len = ptr - tgt; goto valid_obd_name; } /* * tgt_format fsname-cli'dev'-'uuid' except for the llite case * which are named fsname-'uuid'. Examples: * * lustre-clilov-ffff88104db5b800 * lustre-ffff88104db5b800 (for llite device) * * The length of the OBD uuid can vary on different platforms. * This test if any invalid characters are in string. Allow * wildcards with '*' character. */ ptr++; if (!strspn(ptr, "0123456789abcdefABCDEF*")) { len = 0; goto no_fsname; } /* * Now that we validated the device name lets extract the * file system name. Most of the names in this class will * have '-cli' in its name which needs to be dropped. If * it doesn't have '-cli' then its a llite device which * ptr already points to the start of the uuid string. */ tmp = strstr(tgt, "-cli"); if (tmp) ptr = tmp; else ptr--; len = ptr - tgt; valid_obd_name: len = min_t(size_t, len, LUSTRE_MAXFSNAME); snprintf(fsname, buflen, "%.*s", (int)len, tgt); no_fsname: fsname[len] = '\0'; } EXPORT_SYMBOL(obdname2fsname); /** * SERVER NAME *** * * FSNAME is between 1 and 8 characters (inclusive). * Excluded characters are '/' and ':' * SEPARATOR is either ':' or '-' * TYPE: "OST", "MDT", etc. * INDEX: Hex representation of the index */ /** * Get the fsname ("lustre") from the server name ("lustre-OST003F"). * @param [in] svname server name including type and index * @param [out] fsname Buffer to copy filesystem name prefix into. * Must have at least 'strlen(fsname) + 1' chars. * @param [out] endptr if endptr isn't NULL it is set to end of fsname * rc < 0 on error */ int server_name2fsname(const char *svname, char *fsname, const char **endptr) { const char *dash; dash = svname + strnlen(svname, LUSTRE_MAXFSNAME); for (; dash > svname && *dash != '-' && *dash != ':'; dash--) ; if (dash == svname) return -EINVAL; if (fsname != NULL) { strncpy(fsname, svname, dash - svname); fsname[dash - svname] = '\0'; } if (endptr != NULL) *endptr = dash; return 0; } EXPORT_SYMBOL(server_name2fsname); /** * Get service name (svname) from string * rc < 0 on error * if endptr isn't NULL it is set to end of fsname * */ int server_name2svname(const char *label, char *svname, const char **endptr, size_t svsize) { int rc; const char *dash; /* We use server_name2fsname() just for parsing */ rc = server_name2fsname(label, NULL, &dash); if (rc != 0) return rc; if (endptr != NULL) *endptr = dash; if (strlcpy(svname, dash + 1, svsize) >= svsize) return -E2BIG; return 0; } EXPORT_SYMBOL(server_name2svname); /** * check server name is OST. **/ int server_name_is_ost(const char *svname) { const char *dash; int rc; /* We use server_name2fsname() just for parsing */ rc = server_name2fsname(svname, NULL, &dash); if (rc != 0) return rc; dash++; if (strncmp(dash, "OST", 3) == 0) return 1; return 0; } EXPORT_SYMBOL(server_name_is_ost); /** * Get the index from the target name MDTXXXX/OSTXXXX * rc = server type, or rc < 0 on error **/ int target_name2index(const char *tgtname, __u32 *idx, const char **endptr) { const char *dash = tgtname; unsigned long index; int rc; if (strncmp(dash, "MDT", 3) == 0) rc = LDD_F_SV_TYPE_MDT; else if (strncmp(dash, "OST", 3) == 0) rc = LDD_F_SV_TYPE_OST; else return -EINVAL; dash += 3; if (strncmp(dash, "all", 3) == 0) { if (endptr != NULL) *endptr = dash + 3; return rc | LDD_F_SV_ALL; } index = simple_strtoul(dash, (char **)endptr, 16); if (idx != NULL) *idx = index; if (index > 0xffff) return -ERANGE; return rc; } EXPORT_SYMBOL(target_name2index); /* * Get the index from the OBD name. * rc = server type, or * rc < 0 on error * if endptr isn't NULL it is set to end of name */ int server_name2index(const char *svname, __u32 *idx, const char **endptr) { const char *dash; int rc; /* We use server_name2fsname() just for parsing */ rc = server_name2fsname(svname, NULL, &dash); if (rc != 0) return rc; dash++; rc = target_name2index(dash, idx, endptr); if (rc < 0) return rc; /* Account for -mdc after index that is possible when specifying mdt */ if (endptr != NULL && strncmp(LUSTRE_MDC_NAME, *endptr + 1, sizeof(LUSTRE_MDC_NAME)-1) == 0) *endptr += sizeof(LUSTRE_MDC_NAME); return rc; } EXPORT_SYMBOL(server_name2index); /*************** mount common betweeen server and client ***************/ /* Common umount */ int lustre_common_put_super(struct super_block *sb) { int rc; ENTRY; CDEBUG(D_MOUNT, "dropping sb %p\n", sb); /* Drop a ref to the MGC */ rc = lustre_stop_mgc(sb); if (rc && (rc != -ENOENT)) { if (rc != -EBUSY) { CERROR("Can't stop MGC: %d\n", rc); RETURN(rc); } /* * BUSY just means that there's some other OBD that * needs the mgc. Let him clean it up. */ CDEBUG(D_MOUNT, "MGC still in use\n"); } /* Drop a ref to the mounted disk */ lustre_put_lsi(sb); RETURN(rc); } EXPORT_SYMBOL(lustre_common_put_super); static void lmd_print(struct lustre_mount_data *lmd) { int i; PRINT_CMD(D_MOUNT, " mount data:\n"); if (lmd_is_client(lmd)) PRINT_CMD(D_MOUNT, "profile: %s\n", lmd->lmd_profile); PRINT_CMD(D_MOUNT, "device: %s\n", lmd->lmd_dev); PRINT_CMD(D_MOUNT, "flags: %x\n", lmd->lmd_flags); if (lmd->lmd_opts) PRINT_CMD(D_MOUNT, "options: %s\n", lmd->lmd_opts); if (lmd->lmd_recovery_time_soft) PRINT_CMD(D_MOUNT, "recovery time soft: %d\n", lmd->lmd_recovery_time_soft); if (lmd->lmd_recovery_time_hard) PRINT_CMD(D_MOUNT, "recovery time hard: %d\n", lmd->lmd_recovery_time_hard); for (i = 0; i < lmd->lmd_exclude_count; i++) { PRINT_CMD(D_MOUNT, "exclude %d: OST%04x\n", i, lmd->lmd_exclude[i]); } } /* Is this server on the exclusion list */ int lustre_check_exclusion(struct super_block *sb, char *svname) { struct lustre_sb_info *lsi = s2lsi(sb); struct lustre_mount_data *lmd = lsi->lsi_lmd; __u32 index; int i, rc; ENTRY; rc = server_name2index(svname, &index, NULL); if (rc != LDD_F_SV_TYPE_OST) /* Only exclude OSTs */ RETURN(0); CDEBUG(D_MOUNT, "Check exclusion %s (%d) in %d of %s\n", svname, index, lmd->lmd_exclude_count, lmd->lmd_dev); for (i = 0; i < lmd->lmd_exclude_count; i++) { if (index == lmd->lmd_exclude[i]) { CWARN("Excluding %s (on exclusion list)\n", svname); RETURN(1); } } RETURN(0); } /* mount -v -o exclude=lustre-OST0001:lustre-OST0002 -t lustre ... */ static int lmd_make_exclusion(struct lustre_mount_data *lmd, const char *ptr) { const char *s1 = ptr, *s2; __u32 *exclude_list; __u32 index = 0; int rc = 0, devmax; ENTRY; /* * The shortest an ost name can be is 8 chars: -OST0000. * We don't actually know the fsname at this time, so in fact * a user could specify any fsname. */ devmax = strlen(ptr) / 8 + 1; /* temp storage until we figure out how many we have */ OBD_ALLOC_PTR_ARRAY(exclude_list, devmax); if (!exclude_list) RETURN(-ENOMEM); /* we enter this fn pointing at the '=' */ while (*s1 && *s1 != ' ' && *s1 != ',') { s1++; rc = server_name2index(s1, &index, &s2); if (rc < 0) { CERROR("Can't parse server name '%s': rc = %d\n", s1, rc); break; } if (rc == LDD_F_SV_TYPE_OST) exclude_list[lmd->lmd_exclude_count++] = index; else CDEBUG(D_MOUNT, "ignoring exclude %.*s: type = %#x\n", (uint)(s2-s1), s1, rc); s1 = s2; /* * now we are pointing at ':' (next exclude) * or ',' (end of excludes) */ if (lmd->lmd_exclude_count >= devmax) break; } if (rc >= 0) /* non-err */ rc = 0; if (lmd->lmd_exclude_count) { /* permanent, freed in lustre_free_lsi */ OBD_ALLOC_PTR_ARRAY(lmd->lmd_exclude, lmd->lmd_exclude_count); if (lmd->lmd_exclude) { memcpy(lmd->lmd_exclude, exclude_list, sizeof(index) * lmd->lmd_exclude_count); } else { rc = -ENOMEM; lmd->lmd_exclude_count = 0; } } OBD_FREE_PTR_ARRAY(exclude_list, devmax); RETURN(rc); } static int lmd_parse_mgssec(struct lustre_mount_data *lmd, char *ptr) { char *tail; int length; if (lmd->lmd_mgssec != NULL) { OBD_FREE(lmd->lmd_mgssec, strlen(lmd->lmd_mgssec) + 1); lmd->lmd_mgssec = NULL; } tail = strchr(ptr, ','); if (tail == NULL) length = strlen(ptr); else length = tail - ptr; OBD_ALLOC(lmd->lmd_mgssec, length + 1); if (lmd->lmd_mgssec == NULL) return -ENOMEM; memcpy(lmd->lmd_mgssec, ptr, length); lmd->lmd_mgssec[length] = '\0'; return 0; } static int lmd_parse_network(struct lustre_mount_data *lmd, char *ptr) { char *tail; int length; if (lmd->lmd_nidnet != NULL) { OBD_FREE(lmd->lmd_nidnet, strlen(lmd->lmd_nidnet) + 1); lmd->lmd_nidnet = NULL; } tail = strchr(ptr, ','); if (tail == NULL) length = strlen(ptr); else length = tail - ptr; OBD_ALLOC(lmd->lmd_nidnet, length + 1); if (lmd->lmd_nidnet == NULL) return -ENOMEM; memcpy(lmd->lmd_nidnet, ptr, length); lmd->lmd_nidnet[length] = '\0'; return 0; } static int lmd_parse_string(char **handle, char *ptr) { char *tail; int length; if ((handle == NULL) || (ptr == NULL)) return -EINVAL; if (*handle != NULL) { OBD_FREE(*handle, strlen(*handle) + 1); *handle = NULL; } tail = strchr(ptr, ','); if (tail == NULL) length = strlen(ptr); else length = tail - ptr; OBD_ALLOC(*handle, length + 1); if (*handle == NULL) return -ENOMEM; memcpy(*handle, ptr, length); (*handle)[length] = '\0'; return 0; } /* Collect multiple values for mgsnid specifiers */ static int lmd_parse_mgs(struct lustre_mount_data *lmd, char **ptr) { lnet_nid_t nid; char *tail = *ptr; char *mgsnid; int length; int oldlen = 0; /* Find end of NID-list */ while (class_parse_nid_quiet(tail, &nid, &tail) == 0) ; /* do nothing */ length = tail - *ptr; if (length == 0) { LCONSOLE_ERROR_MSG(0x159, "Can't parse NID '%s'\n", *ptr); return -EINVAL; } if (lmd->lmd_mgs != NULL) oldlen = strlen(lmd->lmd_mgs) + 1; OBD_ALLOC(mgsnid, oldlen + length + 1); if (mgsnid == NULL) return -ENOMEM; if (lmd->lmd_mgs != NULL) { /* Multiple mgsnid= are taken to mean failover locations */ memcpy(mgsnid, lmd->lmd_mgs, oldlen); mgsnid[oldlen - 1] = ':'; OBD_FREE(lmd->lmd_mgs, oldlen); } memcpy(mgsnid + oldlen, *ptr, length); mgsnid[oldlen + length] = '\0'; lmd->lmd_mgs = mgsnid; *ptr = tail; return 0; } /** * Find the first delimiter (comma or colon) from the specified \a buf and * make \a *endh point to the string starting with the delimiter. The commas * in expression list [...] will be skipped. * * @buf a delimiter-separated string * @endh a pointer to a pointer that will point to the string * starting with the delimiter * * RETURNS true if delimiter is found, false if delimiter is not found */ static bool lmd_find_delimiter(char *buf, char **endh) { char *c = buf; size_t pos; bool found; if (!buf) return false; try_again: if (*c == ',' || *c == ':') return true; pos = strcspn(c, "[:,]"); if (!pos) return false; /* Not a valid mount string */ if (*c == ']') { CWARN("invalid mount string format\n"); return false; } c += pos; if (*c == '[') { c = strchr(c, ']'); /* invalid mount string */ if (!c) { CWARN("invalid mount string format\n"); return false; } c++; goto try_again; } found = *c != '\0'; if (found && endh) *endh = c; return found; } /** * Find the first valid string delimited by comma or colon from the specified * \a buf and parse it to see whether it's a valid NID list. If yes, \a *endh * will point to the next string starting with the delimiter. * * \param[in] buf a delimiter-separated string * \param[in] endh a pointer to a pointer that will point to the string * starting with the delimiter * * \retval 0 if the string is a valid NID list * \retval 1 if the string is not a valid NID list */ static int lmd_parse_nidlist(char *buf, char **endh) { LIST_HEAD(nidlist); char *endp = buf; char tmp; int rc = 0; if (buf == NULL) return 1; while (*buf == ',' || *buf == ':') buf++; if (*buf == ' ' || *buf == '/' || *buf == '\0') return 1; if (!lmd_find_delimiter(buf, &endp)) endp = buf + strlen(buf); tmp = *endp; *endp = '\0'; if (cfs_parse_nidlist(buf, strlen(buf), &nidlist) <= 0) rc = 1; cfs_free_nidlist(&nidlist); *endp = tmp; if (rc != 0) return rc; if (endh != NULL) *endh = endp; return 0; } /** * Parse mount line options * e.g. mount -v -t lustre -o abort_recov uml1:uml2:/lustre-client /mnt/lustre * dev is passed as device=uml1:/lustre by mount.lustre_tgt */ static int lmd_parse(char *options, struct lustre_mount_data *lmd) { char *s1, *s2, *devname = NULL; struct lustre_mount_data *raw = (struct lustre_mount_data *)options; int rc = 0; ENTRY; LASSERT(lmd); if (!options) { LCONSOLE_ERROR_MSG(0x162, "Missing mount data: check /sbin/mount.lustre_tgt is installed.\n"); RETURN(-EINVAL); } /* Options should be a string - try to detect old lmd data */ if ((raw->lmd_magic & 0xffffff00) == (LMD_MAGIC & 0xffffff00)) { LCONSOLE_ERROR_MSG(0x163, "Using an old version of /sbin/mount.lustre. Please install version %s\n", LUSTRE_VERSION_STRING); RETURN(-EINVAL); } lmd->lmd_magic = LMD_MAGIC; OBD_ALLOC(lmd->lmd_params, LMD_PARAMS_MAXLEN); if (lmd->lmd_params == NULL) RETURN(-ENOMEM); lmd->lmd_params[0] = '\0'; /* Set default flags here */ s1 = options; while (*s1) { int clear = 0; int time_min = OBD_RECOVERY_TIME_MIN; char *s3; /* Skip whitespace and extra commas */ while (*s1 == ' ' || *s1 == ',') s1++; s3 = s1; /* * Client options are parsed in ll_options: eg. flock, * user_xattr, acl */ /* * Parse non-ldiskfs options here. Rather than modifying * ldiskfs, we just zero these out here */ if (strncmp(s1, "abort_recov", 11) == 0) { lmd->lmd_flags |= LMD_FLG_ABORT_RECOV; clear++; } else if (strncmp(s1, "abort_recov_mdt", 15) == 0) { lmd->lmd_flags |= LMD_FLG_ABORT_RECOV_MDT; clear++; } else if (strncmp(s1, "recovery_time_soft=", 19) == 0) { lmd->lmd_recovery_time_soft = max_t(int, simple_strtoul(s1 + 19, NULL, 10), time_min); clear++; } else if (strncmp(s1, "recovery_time_hard=", 19) == 0) { lmd->lmd_recovery_time_hard = max_t(int, simple_strtoul(s1 + 19, NULL, 10), time_min); clear++; } else if (strncmp(s1, "no_precreate", 12) == 0) { lmd->lmd_flags |= LMD_FLG_NO_PRECREATE; clear++; } else if (strncmp(s1, "noir", 4) == 0) { lmd->lmd_flags |= LMD_FLG_NOIR; /* test purpose only. */ clear++; } else if (strncmp(s1, "nosvc", 5) == 0) { lmd->lmd_flags |= LMD_FLG_NOSVC; clear++; } else if (strncmp(s1, "nomgs", 5) == 0) { lmd->lmd_flags |= LMD_FLG_NOMGS; clear++; } else if (strncmp(s1, "noscrub", 7) == 0) { lmd->lmd_flags |= LMD_FLG_NOSCRUB; clear++; } else if (strncmp(s1, "skip_lfsck", 10) == 0) { lmd->lmd_flags |= LMD_FLG_SKIP_LFSCK; clear++; } else if (strncmp(s1, "rdonly_dev", 10) == 0) { lmd->lmd_flags |= LMD_FLG_DEV_RDONLY; clear++; } else if (strncmp(s1, PARAM_MGSNODE, sizeof(PARAM_MGSNODE) - 1) == 0) { s2 = s1 + sizeof(PARAM_MGSNODE) - 1; /* * Assume the next mount opt is the first * invalid NID we get to. */ rc = lmd_parse_mgs(lmd, &s2); if (rc) goto invalid; s3 = s2; clear++; } else if (strncmp(s1, "writeconf", 9) == 0) { lmd->lmd_flags |= LMD_FLG_WRITECONF; clear++; } else if (strncmp(s1, "update", 6) == 0) { lmd->lmd_flags |= LMD_FLG_UPDATE; clear++; } else if (strncmp(s1, "virgin", 6) == 0) { lmd->lmd_flags |= LMD_FLG_VIRGIN; clear++; } else if (strncmp(s1, "noprimnode", 10) == 0) { lmd->lmd_flags |= LMD_FLG_NO_PRIMNODE; clear++; } else if (strncmp(s1, "mgssec=", 7) == 0) { rc = lmd_parse_mgssec(lmd, s1 + 7); if (rc) goto invalid; clear++; /* ost exclusion list */ } else if (strncmp(s1, "exclude=", 8) == 0) { rc = lmd_make_exclusion(lmd, s1 + 7); if (rc) goto invalid; clear++; } else if (strncmp(s1, "mgs", 3) == 0) { /* We are an MGS */ lmd->lmd_flags |= LMD_FLG_MGS; clear++; } else if (strncmp(s1, "svname=", 7) == 0) { rc = lmd_parse_string(&lmd->lmd_profile, s1 + 7); if (rc) goto invalid; clear++; } else if (strncmp(s1, "param=", 6) == 0) { size_t length, params_length; char *tail = s1; if (lmd_find_delimiter(s1 + 6, &tail)) { char *param_str = tail + 1; int supplementary = 1; while (lmd_parse_nidlist(param_str, ¶m_str) == 0) { supplementary = 0; } length = param_str - s1 - supplementary; } else { length = strlen(s1); } length -= 6; params_length = strlen(lmd->lmd_params); if (params_length + length + 1 >= LMD_PARAMS_MAXLEN) RETURN(-E2BIG); strncat(lmd->lmd_params, s1 + 6, length); lmd->lmd_params[params_length + length] = '\0'; strlcat(lmd->lmd_params, " ", LMD_PARAMS_MAXLEN); s3 = s1 + 6 + length; clear++; } else if (strncmp(s1, "localrecov", 10) == 0) { lmd->lmd_flags |= LMD_FLG_LOCAL_RECOV; clear++; } else if (strncmp(s1, "osd=", 4) == 0) { rc = lmd_parse_string(&lmd->lmd_osd_type, s1 + 4); if (rc) goto invalid; clear++; } /* * Linux 2.4 doesn't pass the device, so we stuck it at * the end of the options. */ else if (strncmp(s1, "device=", 7) == 0) { devname = s1 + 7; /* * terminate options right before device. device * must be the last one. */ *s1 = '\0'; break; } else if (strncmp(s1, "network=", 8) == 0) { rc = lmd_parse_network(lmd, s1 + 8); if (rc) goto invalid; /* check if LNet dynamic peer discovery is activated */ if (LNetGetPeerDiscoveryStatus()) { CERROR("LNet Dynamic Peer Discovery is enabled " "on this node. 'network' mount option " "cannot be taken into account.\n"); goto invalid; } clear++; } /* Find next opt */ s2 = strchr(s3, ','); if (s2 == NULL) { if (clear) *s1 = '\0'; break; } s2++; if (clear) memmove(s1, s2, strlen(s2) + 1); else s1 = s2; } if (!devname) { LCONSOLE_ERROR_MSG(0x164, "Can't find device name (need mount option 'device=...')\n"); goto invalid; } s1 = strstr(devname, ":/"); if (s1) { ++s1; lmd->lmd_flags |= LMD_FLG_CLIENT; /* Remove leading /s from fsname */ while (*++s1 == '/') ; s2 = s1; while (*s2 != '/' && *s2 != '\0') s2++; /* Freed in lustre_free_lsi */ OBD_ALLOC(lmd->lmd_profile, s2 - s1 + 8); if (!lmd->lmd_profile) RETURN(-ENOMEM); strncat(lmd->lmd_profile, s1, s2 - s1); strncat(lmd->lmd_profile, "-client", 7); s1 = s2; s2 = s1 + strlen(s1) - 1; /* Remove padding /s from fileset */ while (*s2 == '/') s2--; if (s2 > s1) { OBD_ALLOC(lmd->lmd_fileset, s2 - s1 + 2); if (lmd->lmd_fileset == NULL) { OBD_FREE(lmd->lmd_profile, strlen(lmd->lmd_profile) + 1); RETURN(-ENOMEM); } strncat(lmd->lmd_fileset, s1, s2 - s1 + 1); } } else { /* server mount */ if (lmd->lmd_nidnet != NULL) { /* 'network=' mount option forbidden for server */ OBD_FREE(lmd->lmd_nidnet, strlen(lmd->lmd_nidnet) + 1); lmd->lmd_nidnet = NULL; rc = -EINVAL; CERROR( "%s: option 'network=' not allowed for Lustre servers: rc = %d\n", devname, rc); RETURN(rc); } } /* Freed in lustre_free_lsi */ OBD_ALLOC(lmd->lmd_dev, strlen(devname) + 1); if (!lmd->lmd_dev) RETURN(-ENOMEM); strncpy(lmd->lmd_dev, devname, strlen(devname)+1); /* Save mount options */ s1 = options + strlen(options) - 1; while (s1 >= options && (*s1 == ',' || *s1 == ' ')) *s1-- = 0; while (*options && (*options == ',' || *options == ' ')) options++; if (*options != 0) { /* Freed in lustre_free_lsi */ OBD_ALLOC(lmd->lmd_opts, strlen(options) + 1); if (!lmd->lmd_opts) RETURN(-ENOMEM); strncpy(lmd->lmd_opts, options, strlen(options)+1); } lmd_print(lmd); lmd->lmd_magic = LMD_MAGIC; RETURN(rc); invalid: CERROR("Bad mount options %s\n", options); RETURN(-EINVAL); } /** * 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); }