X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=lustre%2Flov%2Flov_page.c;h=48ef2624fbf3a7f02b16d358301c73ac50838d07;hb=f87359b51f61a4baa9bf62faebb6625d518d23b4;hp=95366c12b134d0b78b5c4fe0af111627b331677b;hpb=e3457782b1fa1bdc6d5170f20774112113dcab50;p=fs%2Flustre-release.git diff --git a/lustre/lov/lov_page.c b/lustre/lov/lov_page.c index 95366c1..48ef262 100644 --- a/lustre/lov/lov_page.c +++ b/lustre/lov/lov_page.c @@ -15,11 +15,7 @@ * * You should have received a copy of the GNU General Public License * version 2 along with this program; If not, see - * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf - * - * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, - * CA 95054 USA or visit www.sun.com if you need additional information or - * have any questions. + * http://www.gnu.org/licenses/gpl-2.0.html * * GPL HEADER END */ @@ -27,7 +23,7 @@ * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. * Use is subject to license terms. * - * Copyright (c) 2011, 2013, Intel Corporation. + * Copyright (c) 2011, 2017, Intel Corporation. */ /* * This file is part of Lustre, http://www.lustre.org/ @@ -53,107 +49,72 @@ * */ -/** - * Adjust the stripe index by layout of raid0. @max_index is the maximum - * page index covered by an underlying DLM lock. - * This function converts max_index from stripe level to file level, and make - * sure it's not beyond one stripe. - */ -static int lov_raid0_page_is_under_lock(const struct lu_env *env, - const struct cl_page_slice *slice, - struct cl_io *unused, - pgoff_t *max_index) -{ - struct lov_object *loo = cl2lov(slice->cpl_obj); - struct lov_layout_raid0 *r0 = lov_r0(loo); - pgoff_t index = *max_index; - unsigned int pps; /* pages per stripe */ - ENTRY; - - CDEBUG(D_READA, DFID "*max_index = %lu, nr = %d\n", - PFID(lu_object_fid(lov2lu(loo))), index, r0->lo_nr); - - if (index == 0) /* the page is not covered by any lock */ - RETURN(0); - - if (r0->lo_nr == 1) /* single stripe file */ - RETURN(0); - - /* max_index is stripe level, convert it into file level */ - if (index != CL_PAGE_EOF) { - int stripeno = lov_page_stripe(slice->cpl_page); - *max_index = lov_stripe_pgoff(loo->lo_lsm, index, stripeno); - } - - /* calculate the end of current stripe */ - pps = loo->lo_lsm->lsm_stripe_size >> PAGE_CACHE_SHIFT; - index = slice->cpl_index + pps - slice->cpl_index % pps - 1; - - CDEBUG(D_READA, DFID "*max_index = %lu, index = %lu, pps = %u, " - "stripe_size = %u, stripe no = %u, page index = %lu\n", - PFID(lu_object_fid(lov2lu(loo))), *max_index, index, pps, - loo->lo_lsm->lsm_stripe_size, lov_page_stripe(slice->cpl_page), - slice->cpl_index); - - /* never exceed the end of the stripe */ - *max_index = min_t(pgoff_t, *max_index, index); - RETURN(0); -} - -static int lov_raid0_page_print(const struct lu_env *env, - const struct cl_page_slice *slice, - void *cookie, lu_printer_t printer) +static int lov_comp_page_print(const struct lu_env *env, + const struct cl_page_slice *slice, + void *cookie, lu_printer_t printer) { struct lov_page *lp = cl2lov_page(slice); - return (*printer)(env, cookie, LUSTRE_LOV_NAME"-page@%p, raid0\n", lp); + return (*printer)(env, cookie, + LUSTRE_LOV_NAME"-page@%p, gen: %u\n", + lp, lp->lps_layout_gen); } -static const struct cl_page_operations lov_raid0_page_ops = { - .cpo_is_under_lock = lov_raid0_page_is_under_lock, - .cpo_print = lov_raid0_page_print +static const struct cl_page_operations lov_comp_page_ops = { + .cpo_print = lov_comp_page_print }; -int lov_page_init_raid0(const struct lu_env *env, struct cl_object *obj, - struct cl_page *page, pgoff_t index) +int lov_page_init_composite(const struct lu_env *env, struct cl_object *obj, + struct cl_page *page, pgoff_t index) { struct lov_object *loo = cl2lov(obj); - struct lov_layout_raid0 *r0 = lov_r0(loo); - struct lov_io *lio = lov_env_io(env); - struct cl_object *subobj; - struct cl_object *o; + struct lov_io *lio = lov_env_io(env); + struct cl_object *subobj; + struct cl_object *o; struct lov_io_sub *sub; - struct lov_page *lpg = cl_object_page_slice(obj, page); - loff_t offset; - obd_off suboff; - int stripe; - int rc; + struct lov_page *lpg = cl_object_page_slice(obj, page); + struct lov_layout_raid0 *r0; + loff_t offset; + loff_t suboff; + int entry; + int stripe; + int rc; + ENTRY; offset = cl_offset(obj, index); - stripe = lov_stripe_number(loo->lo_lsm, offset); + entry = lov_io_layout_at(lio, offset); + if (entry < 0 || !lsm_entry_inited(loo->lo_lsm, entry)) { + /* non-existing layout component */ + lov_page_init_empty(env, obj, page, index); + RETURN(0); + } + + r0 = lov_r0(loo, entry); + stripe = lov_stripe_number(loo->lo_lsm, entry, offset); LASSERT(stripe < r0->lo_nr); - rc = lov_stripe_offset(loo->lo_lsm, offset, stripe, - &suboff); + rc = lov_stripe_offset(loo->lo_lsm, entry, offset, stripe, &suboff); LASSERT(rc == 0); - cl_page_slice_add(page, &lpg->lps_cl, obj, index, &lov_raid0_page_ops); + page->cp_lov_index = lov_comp_index(entry, stripe); + lpg->lps_layout_gen = loo->lo_lsm->lsm_layout_gen; + cl_page_slice_add(page, &lpg->lps_cl, obj, &lov_comp_page_ops); - sub = lov_sub_get(env, lio, stripe); + sub = lov_sub_get(env, lio, page->cp_lov_index); if (IS_ERR(sub)) RETURN(PTR_ERR(sub)); subobj = lovsub2cl(r0->lo_sub[stripe]); list_for_each_entry(o, &subobj->co_lu.lo_header->loh_layers, co_lu.lo_linkage) { - if (o->co_ops->coo_page_init != NULL) { + if (o->co_ops->coo_page_init) { rc = o->co_ops->coo_page_init(sub->sub_env, o, page, cl_index(subobj, suboff)); if (rc != 0) break; } } - lov_sub_put(sub); + RETURN(rc); } @@ -161,9 +122,9 @@ static int lov_empty_page_print(const struct lu_env *env, const struct cl_page_slice *slice, void *cookie, lu_printer_t printer) { - struct lov_page *lp = cl2lov_page(slice); + struct lov_page *lp = cl2lov_page(slice); - return (*printer)(env, cookie, LUSTRE_LOV_NAME"-page@%p, empty.\n", lp); + return (*printer)(env, cookie, LUSTRE_LOV_NAME"-page@%p, empty.\n", lp); } static const struct cl_page_operations lov_empty_page_ops = { @@ -175,9 +136,11 @@ int lov_page_init_empty(const struct lu_env *env, struct cl_object *obj, { struct lov_page *lpg = cl_object_page_slice(obj, page); void *addr; + ENTRY; - cl_page_slice_add(page, &lpg->lps_cl, obj, index, &lov_empty_page_ops); + page->cp_lov_index = ~0; + cl_page_slice_add(page, &lpg->lps_cl, obj, &lov_empty_page_ops); addr = kmap(page->cp_vmpage); memset(addr, 0, cl_page_size(obj)); kunmap(page->cp_vmpage); @@ -185,6 +148,21 @@ int lov_page_init_empty(const struct lu_env *env, struct cl_object *obj, RETURN(0); } +int lov_page_init_foreign(const struct lu_env *env, struct cl_object *obj, + struct cl_page *page, pgoff_t index) +{ + CDEBUG(D_PAGE, DFID" has no data\n", PFID(lu_object_fid(&obj->co_lu))); + RETURN(-ENODATA); +} + +bool lov_page_is_empty(const struct cl_page *page) +{ + const struct cl_page_slice *slice = cl_page_at(page, &lov_device_type); + + LASSERT(slice != NULL); + return slice->cpl_ops == &lov_empty_page_ops; +} + /** @} lov */