/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: * * Copyright (c) 2001-2003 Cluster File Systems, Inc. * Author: Peter Braam * Author: Andreas Dilger * * This file is part of the Lustre file system, http://www.lustre.org * Lustre is a trademark of Cluster File Systems, Inc. * * You may have signed or agreed to another license before downloading * this software. If so, you are bound by the terms and conditions * of that agreement, and the following does not apply to you. See the * LICENSE file included with this distribution for more information. * * If you did not agree to a different license, then this copy of Lustre * is open source software; you can redistribute it and/or modify it * under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * In either case, Lustre 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 * license text for more details. */ #ifndef EXPORT_SYMTAB # define EXPORT_SYMTAB #endif #define DEBUG_SUBSYSTEM S_ECHO #include #include #include #include #include #include #define ECHO_INIT_OBJID 0x1000000000000000ULL #define ECHO_HANDLE_MAGIC 0xabcd0123fedc9876ULL #define ECHO_PERSISTENT_PAGES (ECHO_PERSISTENT_SIZE >> CFS_PAGE_SHIFT) static cfs_page_t *echo_persistent_pages[ECHO_PERSISTENT_PAGES]; enum { LPROC_ECHO_READ_BYTES = 1, LPROC_ECHO_WRITE_BYTES = 2, LPROC_ECHO_LAST = LPROC_ECHO_WRITE_BYTES +1 }; static int echo_connect(const struct lu_env *env, struct lustre_handle *conn, struct obd_device *obd, struct obd_uuid *cluuid, struct obd_connect_data *data, void *localdata) { data->ocd_connect_flags &= ECHO_CONNECT_SUPPORTED; return class_connect(conn, obd, cluuid); } static int echo_disconnect(struct obd_export *exp) { LASSERT (exp != NULL); ldlm_cancel_locks_for_export(exp); /* complete all outstanding replies */ spin_lock(&exp->exp_lock); while (!list_empty(&exp->exp_outstanding_replies)) { struct ptlrpc_reply_state *rs = list_entry(exp->exp_outstanding_replies.next, struct ptlrpc_reply_state, rs_exp_list); struct ptlrpc_service *svc = rs->rs_service; spin_lock(&svc->srv_lock); list_del_init(&rs->rs_exp_list); ptlrpc_schedule_difficult_reply(rs); spin_unlock(&svc->srv_lock); } spin_unlock(&exp->exp_lock); return class_disconnect(exp); } static int echo_destroy_export(struct obd_export *exp) { ENTRY; target_destroy_export(exp); RETURN(0); } static __u64 echo_next_id(struct obd_device *obddev) { obd_id id; spin_lock(&obddev->u.echo.eo_lock); id = ++obddev->u.echo.eo_lastino; spin_unlock(&obddev->u.echo.eo_lock); return id; } int echo_create(struct obd_export *exp, struct obdo *oa, struct lov_stripe_md **ea, struct obd_trans_info *oti) { struct obd_device *obd = class_exp2obd(exp); if (!obd) { CERROR("invalid client cookie "LPX64"\n", exp->exp_handle.h_cookie); return -EINVAL; } if (!(oa->o_mode && S_IFMT)) { CERROR("echo obd: no type!\n"); return -ENOENT; } if (!(oa->o_valid & OBD_MD_FLTYPE)) { CERROR("invalid o_valid "LPX64"\n", oa->o_valid); return -EINVAL; } oa->o_id = echo_next_id(obd); oa->o_valid = OBD_MD_FLID; return 0; } int echo_destroy(struct obd_export *exp, struct obdo *oa, struct lov_stripe_md *ea, struct obd_trans_info *oti, struct obd_export *md_exp) { struct obd_device *obd = class_exp2obd(exp); ENTRY; if (!obd) { CERROR("invalid client cookie "LPX64"\n", exp->exp_handle.h_cookie); RETURN(-EINVAL); } if (!(oa->o_valid & OBD_MD_FLID)) { CERROR("obdo missing FLID valid flag: "LPX64"\n", oa->o_valid); RETURN(-EINVAL); } if (oa->o_id > obd->u.echo.eo_lastino || oa->o_id < ECHO_INIT_OBJID) { CERROR("bad destroy objid: "LPX64"\n", oa->o_id); RETURN(-EINVAL); } RETURN(0); } static int echo_getattr(struct obd_export *exp, struct obd_info *oinfo) { struct obd_device *obd = class_exp2obd(exp); obd_id id = oinfo->oi_oa->o_id; ENTRY; if (!obd) { CERROR("invalid client cookie "LPX64"\n", exp->exp_handle.h_cookie); RETURN(-EINVAL); } if (!(oinfo->oi_oa->o_valid & OBD_MD_FLID)) { CERROR("obdo missing FLID valid flag: "LPX64"\n", oinfo->oi_oa->o_valid); RETURN(-EINVAL); } obdo_cpy_md(oinfo->oi_oa, &obd->u.echo.eo_oa, oinfo->oi_oa->o_valid); oinfo->oi_oa->o_id = id; RETURN(0); } static int echo_setattr(struct obd_export *exp, struct obd_info *oinfo, struct obd_trans_info *oti) { struct obd_device *obd = class_exp2obd(exp); ENTRY; if (!obd) { CERROR("invalid client cookie "LPX64"\n", exp->exp_handle.h_cookie); RETURN(-EINVAL); } if (!(oinfo->oi_oa->o_valid & OBD_MD_FLID)) { CERROR("obdo missing FLID valid flag: "LPX64"\n", oinfo->oi_oa->o_valid); RETURN(-EINVAL); } memcpy(&obd->u.echo.eo_oa, oinfo->oi_oa, sizeof(*oinfo->oi_oa)); if (oinfo->oi_oa->o_id & 4) { /* Save lock to force ACKed reply */ ldlm_lock_addref (&obd->u.echo.eo_nl_lock, LCK_NL); oti->oti_ack_locks[0].mode = LCK_NL; oti->oti_ack_locks[0].lock = obd->u.echo.eo_nl_lock; } RETURN(0); } static void echo_page_debug_setup(cfs_page_t *page, int rw, obd_id id, __u64 offset, int len) { int page_offset = offset & ~CFS_PAGE_MASK; char *addr = ((char *)cfs_kmap(page)) + page_offset; if (len % OBD_ECHO_BLOCK_SIZE != 0) CERROR("Unexpected block size %d\n", len); while (len > 0) { if (rw & OBD_BRW_READ) block_debug_setup(addr, OBD_ECHO_BLOCK_SIZE, offset, id); else block_debug_setup(addr, OBD_ECHO_BLOCK_SIZE, 0xecc0ecc0ecc0ecc0ULL, 0xecc0ecc0ecc0ecc0ULL); addr += OBD_ECHO_BLOCK_SIZE; offset += OBD_ECHO_BLOCK_SIZE; len -= OBD_ECHO_BLOCK_SIZE; } cfs_kunmap(page); } static int echo_page_debug_check(cfs_page_t *page, obd_id id, __u64 offset, int len) { int page_offset = offset & ~CFS_PAGE_MASK; char *addr = ((char *)cfs_kmap(page)) + page_offset; int rc = 0; int rc2; if (len % OBD_ECHO_BLOCK_SIZE != 0) CERROR("Unexpected block size %d\n", len); while (len > 0) { rc2 = block_debug_check("echo", addr, OBD_ECHO_BLOCK_SIZE, offset, id); if (rc2 != 0 && rc == 0) rc = rc2; addr += OBD_ECHO_BLOCK_SIZE; offset += OBD_ECHO_BLOCK_SIZE; len -= OBD_ECHO_BLOCK_SIZE; } cfs_kunmap(page); return (rc); } /* This allows us to verify that desc_private is passed unmolested */ #define DESC_PRIV 0x10293847 int echo_preprw(int cmd, struct obd_export *export, struct obdo *oa, int objcount, struct obd_ioobj *obj, int niocount, struct niobuf_remote *nb, struct niobuf_local *res, struct obd_trans_info *oti, struct lustre_capa *unused) { struct obd_device *obd; struct niobuf_local *r = res; int tot_bytes = 0; int rc = 0; int i; ENTRY; obd = export->exp_obd; if (obd == NULL) RETURN(-EINVAL); /* Temp fix to stop falling foul of osc_announce_cached() */ oa->o_valid &= ~(OBD_MD_FLBLOCKS | OBD_MD_FLGRANT); memset(res, 0, sizeof(*res) * niocount); CDEBUG(D_PAGE, "%s %d obdos with %d IOs\n", cmd == OBD_BRW_READ ? "reading" : "writing", objcount, niocount); if (oti) oti->oti_handle = (void *)DESC_PRIV; for (i = 0; i < objcount; i++, obj++) { int gfp_mask = (obj->ioo_id & 1) ? CFS_ALLOC_HIGHUSER : CFS_ALLOC_STD; int ispersistent = obj->ioo_id == ECHO_PERSISTENT_OBJID; int debug_setup = (!ispersistent && (oa->o_valid & OBD_MD_FLFLAGS) != 0 && (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0); int j; for (j = 0 ; j < obj->ioo_bufcnt ; j++, nb++, r++) { if (ispersistent && (nb->offset >> CFS_PAGE_SHIFT) < ECHO_PERSISTENT_PAGES) { r->page = echo_persistent_pages[nb->offset >> CFS_PAGE_SHIFT]; /* Take extra ref so __free_pages() can be called OK */ cfs_get_page (r->page); } else { OBD_PAGE_ALLOC(r->page, gfp_mask); if (r->page == NULL) { CERROR("can't get page %u/%u for id " LPU64"\n", j, obj->ioo_bufcnt, obj->ioo_id); GOTO(preprw_cleanup, rc = -ENOMEM); } } tot_bytes += nb->len; atomic_inc(&obd->u.echo.eo_prep); r->offset = nb->offset; r->len = nb->len; LASSERT((r->offset & ~CFS_PAGE_MASK) + r->len <= CFS_PAGE_SIZE); CDEBUG(D_PAGE, "$$$$ get page %p @ "LPU64" for %d\n", r->page, r->offset, r->len); if (cmd & OBD_BRW_READ) r->rc = r->len; if (debug_setup) echo_page_debug_setup(r->page, cmd, obj->ioo_id, r->offset, r->len); } } if (cmd & OBD_BRW_READ) lprocfs_counter_add(obd->obd_stats, LPROC_ECHO_READ_BYTES, tot_bytes); else lprocfs_counter_add(obd->obd_stats, LPROC_ECHO_WRITE_BYTES, tot_bytes); CDEBUG(D_PAGE, "%d pages allocated after prep\n", atomic_read(&obd->u.echo.eo_prep)); RETURN(0); preprw_cleanup: /* It is possible that we would rather handle errors by allow * any already-set-up pages to complete, rather than tearing them * all down again. I believe that this is what the in-kernel * prep/commit operations do. */ CERROR("cleaning up %ld pages (%d obdos)\n", (long)(r - res), objcount); while (r-- > res) { cfs_kunmap(r->page); /* NB if this is a persistent page, __free_pages will just * lose the extra ref gained above */ OBD_PAGE_FREE(r->page); atomic_dec(&obd->u.echo.eo_prep); } memset(res, 0, sizeof(*res) * niocount); return rc; } int echo_commitrw(int cmd, struct obd_export *export, struct obdo *oa, int objcount, struct obd_ioobj *obj, int niocount, struct niobuf_local *res, struct obd_trans_info *oti, int rc) { struct obd_device *obd; struct niobuf_local *r = res; int i, vrc = 0; ENTRY; obd = export->exp_obd; if (obd == NULL) RETURN(-EINVAL); if (rc) GOTO(commitrw_cleanup, rc); if ((cmd & OBD_BRW_RWMASK) == OBD_BRW_READ) { CDEBUG(D_PAGE, "reading %d obdos with %d IOs\n", objcount, niocount); } else { CDEBUG(D_PAGE, "writing %d obdos with %d IOs\n", objcount, niocount); } if (niocount && !r) { CERROR("NULL res niobuf with niocount %d\n", niocount); RETURN(-EINVAL); } LASSERT(oti == NULL || oti->oti_handle == (void *)DESC_PRIV); for (i = 0; i < objcount; i++, obj++) { int verify = (rc == 0 && obj->ioo_id != ECHO_PERSISTENT_OBJID && (oa->o_valid & OBD_MD_FLFLAGS) != 0 && (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0); int j; for (j = 0 ; j < obj->ioo_bufcnt ; j++, r++) { cfs_page_t *page = r->page; void *addr; if (page == NULL) { CERROR("null page objid "LPU64":%p, buf %d/%d\n", obj->ioo_id, page, j, obj->ioo_bufcnt); GOTO(commitrw_cleanup, rc = -EFAULT); } addr = cfs_kmap(page); CDEBUG(D_PAGE, "$$$$ use page %p, addr %p@"LPU64"\n", r->page, addr, r->offset); if (verify) { vrc = echo_page_debug_check(page, obj->ioo_id, r->offset, r->len); /* check all the pages always */ if (vrc != 0 && rc == 0) rc = vrc; } cfs_kunmap(page); /* NB see comment above regarding persistent pages */ OBD_PAGE_FREE(page); atomic_dec(&obd->u.echo.eo_prep); } } CDEBUG(D_PAGE, "%d pages remain after commit\n", atomic_read(&obd->u.echo.eo_prep)); RETURN(rc); commitrw_cleanup: CERROR("cleaning up %ld pages (%d obdos)\n", niocount - (long)(r - res) - 1, objcount); while (++r < res + niocount) { cfs_page_t *page = r->page; /* NB see comment above regarding persistent pages */ OBD_PAGE_FREE(page); atomic_dec(&obd->u.echo.eo_prep); } return rc; } static int echo_setup(struct obd_device *obd, struct lustre_cfg *lcfg) { struct lprocfs_static_vars lvars; int rc; int lock_flags = 0; struct ldlm_res_id res_id = {.name = {1}}; ENTRY; spin_lock_init(&obd->u.echo.eo_lock); obd->u.echo.eo_lastino = ECHO_INIT_OBJID; obd->obd_namespace = ldlm_namespace_new(obd, "echo-tgt", LDLM_NAMESPACE_SERVER, LDLM_NAMESPACE_MODEST); if (obd->obd_namespace == NULL) { LBUG(); RETURN(-ENOMEM); } rc = ldlm_cli_enqueue_local(obd->obd_namespace, &res_id, LDLM_PLAIN, NULL, LCK_NL, &lock_flags, NULL, ldlm_completion_ast, NULL, NULL, 0, NULL, &obd->u.echo.eo_nl_lock); LASSERT (rc == ELDLM_OK); lprocfs_echo_init_vars(&lvars); if (lprocfs_obd_setup(obd, lvars.obd_vars) == 0 && lprocfs_alloc_obd_stats(obd, LPROC_ECHO_LAST) == 0) { lprocfs_counter_init(obd->obd_stats, LPROC_ECHO_READ_BYTES, LPROCFS_CNTR_AVGMINMAX, "read_bytes", "bytes"); lprocfs_counter_init(obd->obd_stats, LPROC_ECHO_WRITE_BYTES, LPROCFS_CNTR_AVGMINMAX, "write_bytes", "bytes"); } ptlrpc_init_client (LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL, "echo_ldlm_cb_client", &obd->obd_ldlm_client); RETURN(0); } static int echo_cleanup(struct obd_device *obd) { int leaked; ENTRY; lprocfs_obd_cleanup(obd); lprocfs_free_obd_stats(obd); ldlm_lock_decref (&obd->u.echo.eo_nl_lock, LCK_NL); /* XXX Bug 3413; wait for a bit to ensure the BL callback has * happened before calling ldlm_namespace_free() */ set_current_state (TASK_UNINTERRUPTIBLE); cfs_schedule_timeout (CFS_TASK_UNINT, cfs_time_seconds(1)); ldlm_namespace_free(obd->obd_namespace, NULL, obd->obd_force); obd->obd_namespace = NULL; leaked = atomic_read(&obd->u.echo.eo_prep); if (leaked != 0) CERROR("%d prep/commitrw pages leaked\n", leaked); RETURN(0); } static struct obd_ops echo_obd_ops = { .o_owner = THIS_MODULE, .o_connect = echo_connect, .o_disconnect = echo_disconnect, .o_destroy_export = echo_destroy_export, .o_create = echo_create, .o_destroy = echo_destroy, .o_getattr = echo_getattr, .o_setattr = echo_setattr, .o_preprw = echo_preprw, .o_commitrw = echo_commitrw, .o_setup = echo_setup, .o_cleanup = echo_cleanup }; extern int echo_client_init(void); extern void echo_client_exit(void); static void echo_persistent_pages_fini (void) { int i; for (i = 0; i < ECHO_PERSISTENT_PAGES; i++) if (echo_persistent_pages[i] != NULL) { OBD_PAGE_FREE(echo_persistent_pages[i]); echo_persistent_pages[i] = NULL; } } static int echo_persistent_pages_init (void) { cfs_page_t *pg; int i; for (i = 0; i < ECHO_PERSISTENT_PAGES; i++) { int gfp_mask = (i < ECHO_PERSISTENT_PAGES/2) ? CFS_ALLOC_STD : CFS_ALLOC_HIGHUSER; OBD_PAGE_ALLOC(pg, gfp_mask); if (pg == NULL) { echo_persistent_pages_fini (); return (-ENOMEM); } memset (cfs_kmap (pg), 0, CFS_PAGE_SIZE); cfs_kunmap (pg); echo_persistent_pages[i] = pg; } return (0); } static int __init obdecho_init(void) { struct lprocfs_static_vars lvars; int rc; ENTRY; printk(KERN_INFO "Lustre: Echo OBD driver; info@clusterfs.com\n"); LASSERT(CFS_PAGE_SIZE % OBD_ECHO_BLOCK_SIZE == 0); lprocfs_echo_init_vars(&lvars); rc = echo_persistent_pages_init (); if (rc != 0) goto failed_0; rc = class_register_type(&echo_obd_ops, NULL, lvars.module_vars, LUSTRE_ECHO_NAME, NULL); if (rc != 0) goto failed_1; rc = echo_client_init(); if (rc == 0) RETURN (0); class_unregister_type(LUSTRE_ECHO_NAME); failed_1: echo_persistent_pages_fini (); failed_0: RETURN(rc); } static void /*__exit*/ obdecho_exit(void) { echo_client_exit(); class_unregister_type(LUSTRE_ECHO_NAME); echo_persistent_pages_fini (); } MODULE_AUTHOR("Cluster File Systems, Inc. "); MODULE_DESCRIPTION("Lustre Testing Echo OBD driver"); MODULE_LICENSE("GPL"); cfs_module(obdecho, "1.0.0", obdecho_init, obdecho_exit);