X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lustre%2Fllite%2Frw.c;h=4c6da36d9665f8e04815f6601b9f07f310748fca;hp=3b142faf7f78272b4824b76b94f886a6c2c29883;hb=a221fb78b48c82df803e1f6f1548a2f75e0ad13f;hpb=7c4035f317111463f62b708f073cee8ef01e52dd diff --git a/lustre/llite/rw.c b/lustre/llite/rw.c index 3b142fa..4c6da36 100644 --- a/lustre/llite/rw.c +++ b/lustre/llite/rw.c @@ -1,27 +1,44 @@ /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: * - * Lustre Lite I/O page cache routines shared by different kernel revs + * GPL HEADER START + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * - * Copyright (c) 2001-2003 Cluster File Systems, Inc. + * 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 file is part of Lustre, http://www.lustre.org. + * 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). * - * Lustre is free 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. + * 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 * - * 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 - * GNU General Public License for more details. + * 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. * - * You should have received a copy of the GNU General Public License - * along with Lustre; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * GPL HEADER END + */ +/* + * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. + * Use is subject to license terms. + */ +/* + * This file is part of Lustre, http://www.lustre.org/ + * Lustre is a trademark of Sun Microsystems, Inc. + * + * lustre/llite/rw.c + * + * Lustre Lite I/O page cache routines shared by different kernel revs */ -#include +#include #include #include #include @@ -36,891 +53,752 @@ #include #include #include -#include #include #include #include +/* current_is_kswapd() */ +#include #define DEBUG_SUBSYSTEM S_LLITE -#include -#include +//#include +#include +#include #include "llite_internal.h" #include -#ifndef list_for_each_prev_safe -#define list_for_each_prev_safe(pos, n, head) \ - for (pos = (head)->prev, n = pos->prev; pos != (head); \ - pos = n, n = pos->prev ) -#endif - -/* SYNCHRONOUS I/O to object storage for an inode */ -static int ll_brw(int cmd, struct inode *inode, struct obdo *oa, - struct page *page, int flags) +/* this isn't where truncate starts. roughly: + * sys_truncate->ll_setattr_raw->vmtruncate->ll_truncate. setattr_raw grabs + * DLM lock on [size, EOF], i_mutex, ->lli_size_sem, and WRITE_I_ALLOC_SEM to + * avoid races. + * + * must be called under ->lli_size_sem */ +void ll_truncate(struct inode *inode) { struct ll_inode_info *lli = ll_i2info(inode); - struct lov_stripe_md *lsm = lli->lli_smd; - struct timeval start; - struct brw_page pg; - int rc; ENTRY; - do_gettimeofday(&start); - - pg.pg = page; - pg.disk_offset = pg.page_offset = ((obd_off)page->index) << PAGE_SHIFT; + CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p) to %Lu\n",inode->i_ino, + inode->i_generation, inode, i_size_read(inode)); - if (cmd == OBD_BRW_WRITE && - (pg.disk_offset + PAGE_SIZE > inode->i_size)) - pg.count = inode->i_size % PAGE_SIZE; - else - pg.count = PAGE_SIZE; - - CDEBUG(D_PAGE, "%s %d bytes ino %lu at "LPU64"/"LPX64"\n", - cmd & OBD_BRW_WRITE ? "write" : "read", pg.count, inode->i_ino, - pg.disk_offset, pg.disk_offset); - if (pg.count == 0) { - CERROR("ZERO COUNT: ino %lu: size %p:%Lu(%p:%Lu) idx %lu off " - LPU64"\n", inode->i_ino, inode, inode->i_size, - page->mapping->host, page->mapping->host->i_size, - page->index, pg.disk_offset); + ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_TRUNC, 1); + if (lli->lli_size_sem_owner == cfs_current()) { + LASSERT_SEM_LOCKED(&lli->lli_size_sem); + ll_inode_size_unlock(inode, 0); } - pg.flag = flags; - - if (cmd == OBD_BRW_WRITE) - lprocfs_counter_add(ll_i2sbi(inode)->ll_stats, - LPROC_LL_BRW_WRITE, pg.count); - else - lprocfs_counter_add(ll_i2sbi(inode)->ll_stats, - LPROC_LL_BRW_READ, pg.count); - rc = obd_brw(cmd, ll_i2dtexp(inode), oa, lsm, 1, &pg, NULL); - if (rc == 0) - obdo_to_inode(inode, oa, OBD_MD_FLBLOCKS); - else if (rc != -EIO) - CERROR("error from obd_brw: rc = %d\n", rc); - ll_stime_record(ll_i2sbi(inode), &start, - &ll_i2sbi(inode)->ll_brw_stime); - RETURN(rc); -} - -__u64 lov_merge_size(struct lov_stripe_md *lsm, int kms); + EXIT; + return; +} /* ll_truncate */ -/* - * this isn't where truncate starts. roughly: - * sys_truncate->ll_setattr_raw->vmtruncate->ll_truncate - * we grab the lock back in setattr_raw to avoid races. - * - * must be called with lli_size_sem held. +/** + * Finalizes cl-data before exiting typical address_space operation. Dual to + * ll_cl_init(). */ -void ll_truncate(struct inode *inode) +static void ll_cl_fini(struct ll_cl_context *lcc) { - struct lov_stripe_md *lsm = ll_i2info(inode)->lli_smd; - struct ll_inode_info *lli = ll_i2info(inode); - struct obdo *oa = NULL; - int rc; - ENTRY; + struct lu_env *env = lcc->lcc_env; + struct cl_io *io = lcc->lcc_io; + struct cl_page *page = lcc->lcc_page; - CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p) to %llu\n", inode->i_ino, - inode->i_generation, inode, inode->i_size); + LASSERT(lcc->lcc_cookie == current); + LASSERT(env != NULL); - if (lli->lli_size_pid != current->pid) { - EXIT; - return; + if (page != NULL) { + lu_ref_del(&page->cp_reference, "cl_io", io); + cl_page_put(env, page); } - if (!lsm) { - CDEBUG(D_INODE, "truncate on inode %lu with no objects\n", - inode->i_ino); - GOTO(out_unlock, 0); + if (io && lcc->lcc_created) { + cl_io_end(env, io); + cl_io_unlock(env, io); + cl_io_iter_fini(env, io); + cl_io_fini(env, io); + } + cl_env_put(env, &lcc->lcc_refcheck); +} + +/** + * Initializes common cl-data at the typical address_space operation entry + * point. + */ +static struct ll_cl_context *ll_cl_init(struct file *file, + struct page *vmpage, int create) +{ + struct ll_cl_context *lcc; + struct lu_env *env; + struct cl_io *io; + struct cl_object *clob; + struct ccc_io *cio; + + int refcheck; + int result = 0; + + clob = ll_i2info(vmpage->mapping->host)->lli_clob; + LASSERT(clob != NULL); + + env = cl_env_get(&refcheck); + if (IS_ERR(env)) + return ERR_PTR(PTR_ERR(env)); + + lcc = &vvp_env_info(env)->vti_io_ctx; + memset(lcc, 0, sizeof(*lcc)); + lcc->lcc_env = env; + lcc->lcc_refcheck = refcheck; + lcc->lcc_cookie = current; + + cio = ccc_env_io(env); + io = cio->cui_cl.cis_io; + if (io == NULL && create) { + struct vvp_io *vio; + loff_t pos; + + /* + * Loop-back driver calls ->prepare_write() and ->sendfile() + * methods directly, bypassing file system ->write() operation, + * so cl_io has to be created here. + */ + + io = &ccc_env_info(env)->cti_io; + vio = vvp_env_io(env); + ll_io_init(io, file, 1); + + /* No lock at all for this kind of IO - we can't do it because + * we have held page lock, it would cause deadlock. + * XXX: This causes poor performance to loop device - One page + * per RPC. + * In order to get better performance, users should use + * lloop driver instead. + */ + io->ci_lockreq = CILR_NEVER; + + pos = (vmpage->index << CFS_PAGE_SHIFT); + + /* Create a temp IO to serve write. */ + result = cl_io_rw_init(env, io, CIT_WRITE, pos, CFS_PAGE_SIZE); + if (result == 0) { + cio->cui_fd = LUSTRE_FPRIVATE(file); + cio->cui_iov = NULL; + cio->cui_nrsegs = 0; + result = cl_io_iter_init(env, io); + if (result == 0) { + result = cl_io_lock(env, io); + if (result == 0) + result = cl_io_start(env, io); + } + } else + result = io->ci_result; + lcc->lcc_created = 1; } - LASSERT(atomic_read(&lli->lli_size_sem.count) <= 0); - - if (lov_merge_size(lsm, 0) == inode->i_size) { - CDEBUG(D_VFSTRACE, "skipping punch for "LPX64" (size = %llu)\n", - lsm->lsm_object_id, inode->i_size); - GOTO(out_unlock, 0); + lcc->lcc_io = io; + if (io == NULL) + result = -EIO; + if (result == 0) { + struct cl_page *page; + + LASSERT(io != NULL); + LASSERT(io->ci_state == CIS_IO_GOING); + LASSERT(cio->cui_fd == LUSTRE_FPRIVATE(file)); + page = cl_page_find(env, clob, vmpage->index, vmpage, + CPT_CACHEABLE); + if (!IS_ERR(page)) { + lcc->lcc_page = page; + lu_ref_add(&page->cp_reference, "cl_io", io); + result = 0; + } else + result = PTR_ERR(page); } - - CDEBUG(D_INFO, "calling punch for "LPX64" (new size %llu)\n", - lsm->lsm_object_id, inode->i_size); - - oa = obdo_alloc(); - if (oa == NULL) { - CERROR("cannot alloc oa, error %d\n", - -ENOMEM); - EXIT; - return; + if (result) { + ll_cl_fini(lcc); + lcc = ERR_PTR(result); } - oa->o_id = lsm->lsm_object_id; - oa->o_gr = lsm->lsm_object_gr; - oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP | OBD_MD_FLIFID; - obdo_from_inode(oa, inode, OBD_MD_FLTYPE | OBD_MD_FLMODE | - OBD_MD_FLATIME | OBD_MD_FLMTIME | OBD_MD_FLCTIME); - memcpy(obdo_id(oa), &lli->lli_id, sizeof(lli->lli_id)); - - obd_adjust_kms(ll_i2dtexp(inode), lsm, inode->i_size, 1); - - lli->lli_size_pid = 0; - up(&lli->lli_size_sem); - - rc = obd_punch(ll_i2dtexp(inode), oa, lsm, inode->i_size, - OBD_OBJECT_EOF, NULL, lli->lli_trunc_capa); - if (rc) - CERROR("obd_truncate fails (%d) ino %lu\n", rc, inode->i_ino); - else - obdo_to_inode(inode, oa, OBD_MD_FLSIZE | OBD_MD_FLBLOCKS | - OBD_MD_FLATIME | OBD_MD_FLMTIME | OBD_MD_FLCTIME); - - obdo_free(oa); - - EXIT; - return; - -out_unlock: - LASSERT(atomic_read(&lli->lli_size_sem.count) <= 0); - up(&lli->lli_size_sem); -} /* ll_truncate */ + CDEBUG(D_VFSTRACE, "%lu@"DFID" -> %i %p %p\n", + vmpage->index, PFID(lu_object_fid(&clob->co_lu)), result, + env, io); + return lcc; +} -struct ll_async_page *llap_cast_private(struct page *page) +static struct ll_cl_context *ll_cl_get(void) { - struct ll_async_page *llap = (struct ll_async_page *)page->private; - - LASSERTF(llap == NULL || llap->llap_magic == LLAP_MAGIC, - "page %p private %lu gave magic %d which != %d\n", - page, page->private, llap->llap_magic, LLAP_MAGIC); - return llap; + struct ll_cl_context *lcc; + struct lu_env *env; + int refcheck; + + env = cl_env_get(&refcheck); + LASSERT(!IS_ERR(env)); + lcc = &vvp_env_info(env)->vti_io_ctx; + LASSERT(env == lcc->lcc_env); + LASSERT(current == lcc->lcc_cookie); + cl_env_put(env, &refcheck); + + /* env has got in ll_cl_init, so it is still usable. */ + return lcc; } -int ll_prepare_write(struct file *file, struct page *page, - unsigned from, unsigned to) +/** + * ->prepare_write() address space operation called by generic_file_write() + * for every page during write. + */ +int ll_prepare_write(struct file *file, struct page *vmpage, unsigned from, + unsigned to) { - struct inode *inode = page->mapping->host; - struct ll_inode_info *lli = ll_i2info(inode); - struct lov_stripe_md *lsm = lli->lli_smd; - obd_off offset = ((obd_off)page->index) << PAGE_SHIFT; - struct obdo *oa = NULL; - struct brw_page pga; - __u64 kms; - int rc = 0; + struct ll_cl_context *lcc; + int result; ENTRY; - LASSERT(LLI_DIRTY_HANDLE(inode)); - LASSERT(PageLocked(page)); - (void)llap_cast_private(page); /* assertion */ - - /* Check to see if we should return -EIO right away */ - pga.pg = page; - pga.disk_offset = pga.page_offset = offset; - pga.count = PAGE_SIZE; - pga.flag = 0; - - oa = obdo_alloc(); - if (oa == NULL) - RETURN(-ENOMEM); - - oa->o_id = lsm->lsm_object_id; - oa->o_gr = lsm->lsm_object_gr; - oa->o_mode = inode->i_mode; - - oa->o_valid = OBD_MD_FLID | OBD_MD_FLMODE | - OBD_MD_FLTYPE | OBD_MD_FLGROUP; - - oa->o_fsuid = current->fsuid; - oa->o_valid |= OBD_MD_FLFSUID; - - rc = obd_brw(OBD_BRW_CHECK, ll_i2dtexp(inode), - oa, lsm, 1, &pga, NULL); - if (rc) - GOTO(out_free_oa, rc); - - if (PageUptodate(page)) - GOTO(out_free_oa, 0); - - /* We're completely overwriting an existing page, so _don't_ set it up - * to date until commit_write */ - if (from == 0 && to == PAGE_SIZE) { - POISON_PAGE(page, 0x11); - GOTO(out_free_oa, 0); - } - - /* If are writing to a new page, no need to read old data. The extent - * locking will have updated the KMS, and for our purposes here we can - * treat it like i_size. */ - down(&lli->lli_size_sem); - kms = lov_merge_size(lsm, 1); - up(&lli->lli_size_sem); - if (kms <= offset) { - memset(kmap(page), 0, PAGE_SIZE); - kunmap(page); - GOTO(prepare_done, rc = 0); - } - - /* XXX could be an async ocp read.. read-ahead? */ - rc = ll_brw(OBD_BRW_READ, inode, oa, page, 0); - if (rc == 0) { - /* bug 1598: don't clobber blksize */ - oa->o_valid &= ~(OBD_MD_FLSIZE | OBD_MD_FLBLKSZ); - obdo_refresh_inode(inode, oa, oa->o_valid); - } else if (rc == -ENOENT) { - /* tolerate no entry error here, cause the objects might - * not be created yet */ - rc = 0; + lcc = ll_cl_init(file, vmpage, 1); + if (!IS_ERR(lcc)) { + struct lu_env *env = lcc->lcc_env; + struct cl_io *io = lcc->lcc_io; + struct cl_page *page = lcc->lcc_page; + + cl_page_assume(env, io, page); + if (cl_io_is_append(io)) { + struct cl_object *obj = io->ci_obj; + struct inode *inode = ccc_object_inode(obj); + /** + * In VFS file->page write loop, for appending, the + * write offset might be reset according to the new + * file size before holding i_mutex. So crw_pos should + * be reset here. BUG:17711. + */ + io->u.ci_wr.wr.crw_pos = i_size_read(inode); + } + result = cl_io_prepare_write(env, io, page, from, to); + if (result == 0) { + /* + * Add a reference, so that page is not evicted from + * the cache until ->commit_write() is called. + */ + cl_page_get(page); + lu_ref_add(&page->cp_reference, "prepare_write", + cfs_current()); + } else { + cl_page_unassume(env, io, page); + ll_cl_fini(lcc); + } + /* returning 0 in prepare assumes commit must be called + * afterwards */ + } else { + result = PTR_ERR(lcc); } - - EXIT; -prepare_done: - if (rc == 0) - SetPageUptodate(page); -out_free_oa: - obdo_free(oa); - return rc; + RETURN(result); } -static int ll_ap_make_ready(void *data, int cmd) +int ll_commit_write(struct file *file, struct page *vmpage, unsigned from, + unsigned to) { - struct ll_async_page *llap; - struct page *page; + struct ll_cl_context *lcc; + struct lu_env *env; + struct cl_io *io; + struct cl_page *page; + int result; ENTRY; - llap = LLAP_FROM_COOKIE(data); - page = llap->llap_page; - - LASSERT(cmd != OBD_BRW_READ); + lcc = ll_cl_get(); + env = lcc->lcc_env; + page = lcc->lcc_page; + io = lcc->lcc_io; - /* we're trying to write, but the page is locked.. come back later */ - if (TryLockPage(page)) - RETURN(-EAGAIN); + LASSERT(cl_page_is_owned(page, io)); + result = cl_io_commit_write(env, io, page, from, to); + if (cl_page_is_owned(page, io)) + cl_page_unassume(env, io, page); + /* + * Release reference acquired by cl_io_prepare_write(). + */ + lu_ref_del(&page->cp_reference, "prepare_write", cfs_current()); + cl_page_put(env, page); + ll_cl_fini(lcc); + RETURN(result); +} - LL_CDEBUG_PAGE(D_PAGE, page, "made ready\n"); - page_cache_get(page); +struct obd_capa *cl_capa_lookup(struct inode *inode, enum cl_req_type crt) +{ + __u64 opc; - /* if we left PageDirty we might get another writepage call - * in the future. list walkers are bright enough - * to check page dirty so we can leave it on whatever list - * its on. XXX also, we're called with the cli list so if - * we got the page cache list we'd create a lock inversion - * with the removepage path which gets the page lock then the - * cli lock */ - clear_page_dirty(page); - RETURN(0); + opc = crt == CRT_WRITE ? CAPA_OPC_OSS_WRITE : CAPA_OPC_OSS_RW; + return ll_osscapa_get(inode, opc); } -/* We have two reasons for giving llite the opportunity to change the - * write length of a given queued page as it builds the RPC containing - * the page: - * - * 1) Further extending writes may have landed in the page cache - * since a partial write first queued this page requiring us - * to write more from the page cache. (No further races are possible, since - * by the time this is called, the page is locked.) - * 2) We might have raced with truncate and want to avoid performing - * write RPCs that are just going to be thrown away by the - * truncate's punch on the storage targets. +static void ll_ra_stats_inc_sbi(struct ll_sb_info *sbi, enum ra_stat which); + +/* WARNING: This algorithm is used to reduce the contention on + * sbi->ll_lock. It should work well if the ra_max_pages is much + * greater than the single file's read-ahead window. * - * The kms serves these purposes as it is set at both truncate and extending - * writes. + * TODO: There may exist a `global sync problem' in this implementation. + * Considering the global ra window is 100M, and each file's ra window is 10M, + * there are over 10 files trying to get its ra budget and reach + * ll_ra_count_get at the exactly same time. All of them will get a zero ra + * window, although the global window is 100M. -jay */ -static int ll_ap_refresh_count(void *data, int cmd) +static unsigned long ll_ra_count_get(struct ll_sb_info *sbi, unsigned long len) { - struct ll_inode_info *lli; - struct ll_async_page *llap; - struct lov_stripe_md *lsm; - struct page *page; - __u64 kms; + struct ll_ra_info *ra = &sbi->ll_ra_info; + unsigned long ret; ENTRY; - /* readpage queues with _COUNT_STABLE, shouldn't get here. */ - LASSERT(cmd != OBD_BRW_READ); - - llap = LLAP_FROM_COOKIE(data); - page = llap->llap_page; - lli = ll_i2info(page->mapping->host); - lsm = lli->lli_smd; - - /* - * this callback is called with client lock taken, thus, it should not - * sleep or deadlock is possible. --umka + /** + * If read-ahead pages left are less than 1M, do not do read-ahead, + * otherwise it will form small read RPC(< 1M), which hurt server + * performance a lot. */ -// down(&lli->lli_size_sem); - kms = lov_merge_size(lsm, 1); -// up(&lli->lli_size_sem); - - /* catch race with truncate */ - if (((__u64)page->index << PAGE_SHIFT) >= kms) - return 0; + ret = min(ra->ra_max_pages - cfs_atomic_read(&ra->ra_cur_pages), len); + if ((int)ret < 0 || ret < min((unsigned long)PTLRPC_MAX_BRW_PAGES, len)) + GOTO(out, ret = 0); - /* catch sub-page write at end of file */ - if (((__u64)page->index << PAGE_SHIFT) + PAGE_SIZE > kms) - return kms % PAGE_SIZE; - - return PAGE_SIZE; + if (cfs_atomic_add_return(ret, &ra->ra_cur_pages) > ra->ra_max_pages) { + cfs_atomic_sub(ret, &ra->ra_cur_pages); + ret = 0; + } +out: + RETURN(ret); } -void ll_inode_fill_obdo(struct inode *inode, int cmd, struct obdo *oa) +void ll_ra_count_put(struct ll_sb_info *sbi, unsigned long len) { - struct lov_stripe_md *lsm; - obd_valid valid_flags; - - lsm = ll_i2info(inode)->lli_smd; - - oa->o_id = lsm->lsm_object_id; - oa->o_gr = lsm->lsm_object_gr; - oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP; - valid_flags = OBD_MD_FLTYPE | OBD_MD_FLATIME; - if (cmd == OBD_BRW_WRITE || cmd == OBD_BRW_READ) { - oa->o_valid |= OBD_MD_FLIFID | OBD_MD_FLEPOCH; - *(obdo_id(oa)) = ll_i2info(inode)->lli_id; - oa->o_easize = ll_i2info(inode)->lli_io_epoch; - valid_flags |= OBD_MD_FLMTIME | OBD_MD_FLCTIME; - } - - obdo_from_inode(oa, inode, valid_flags); + struct ll_ra_info *ra = &sbi->ll_ra_info; + cfs_atomic_sub(len, &ra->ra_cur_pages); } -static void ll_ap_fill_obdo(void *data, int cmd, struct obdo *oa) +static void ll_ra_stats_inc_sbi(struct ll_sb_info *sbi, enum ra_stat which) { - struct ll_async_page *llap; - ENTRY; - - llap = LLAP_FROM_COOKIE(data); - ll_inode_fill_obdo(llap->llap_page->mapping->host, cmd, oa); - oa->o_fsuid = llap->llap_fsuid; - EXIT; + LASSERTF(which >= 0 && which < _NR_RA_STAT, "which: %u\n", which); + lprocfs_counter_incr(sbi->ll_ra_stats, which); } -static struct obd_async_page_ops ll_async_page_ops = { - .ap_make_ready = ll_ap_make_ready, - .ap_refresh_count = ll_ap_refresh_count, - .ap_fill_obdo = ll_ap_fill_obdo, - .ap_completion = ll_ap_completion, -}; - - -/* XXX have the exp be an argument? */ -struct ll_async_page *llap_from_page(struct page *page, unsigned origin) +void ll_ra_stats_inc(struct address_space *mapping, enum ra_stat which) { - struct ll_async_page *llap; - struct obd_export *exp; - struct inode *inode = page->mapping->host; - struct ll_sb_info *sbi = ll_i2sbi(inode); - int rc; - ENTRY; - - LASSERTF(origin < LLAP__ORIGIN_MAX, "%u\n", origin); + struct ll_sb_info *sbi = ll_i2sbi(mapping->host); + ll_ra_stats_inc_sbi(sbi, which); +} - llap = llap_cast_private(page); - if (llap != NULL) { - GOTO(out, llap); - } - exp = ll_i2dtexp(page->mapping->host); - if (exp == NULL) - RETURN(ERR_PTR(-EINVAL)); - - OBD_ALLOC(llap, sizeof(*llap)); - if (llap == NULL) { - RETURN(ERR_PTR(-ENOMEM)); - } - llap->llap_magic = LLAP_MAGIC; - INIT_LIST_HEAD(&llap->llap_pending_write); - rc = obd_prep_async_page(exp, ll_i2info(inode)->lli_smd, NULL, page, - (obd_off)page->index << PAGE_SHIFT, - &ll_async_page_ops, llap, &llap->llap_cookie); - if (rc) { - OBD_FREE(llap, sizeof(*llap)); - RETURN(ERR_PTR(rc)); - } +#define RAS_CDEBUG(ras) \ + CDEBUG(D_READA, \ + "lrp %lu cr %lu cp %lu ws %lu wl %lu nra %lu r %lu ri %lu" \ + "csr %lu sf %lu sp %lu sl %lu \n", \ + ras->ras_last_readpage, ras->ras_consecutive_requests, \ + ras->ras_consecutive_pages, ras->ras_window_start, \ + ras->ras_window_len, ras->ras_next_readahead, \ + ras->ras_requests, ras->ras_request_index, \ + ras->ras_consecutive_stride_requests, ras->ras_stride_offset, \ + ras->ras_stride_pages, ras->ras_stride_length) - CDEBUG(D_CACHE, "llap %p page %p cookie %p obj off "LPU64"\n", llap, - page, llap->llap_cookie, (obd_off)page->index << PAGE_SHIFT); - - __set_page_ll_data(page, llap); - - /* also zeroing the PRIVBITS low order bitflags */ - llap->llap_page = page; +static int index_in_window(unsigned long index, unsigned long point, + unsigned long before, unsigned long after) +{ + unsigned long start = point - before, end = point + after; - spin_lock(&sbi->ll_lock); - sbi->ll_pglist_gen++; - list_add_tail(&llap->llap_proc_item, &sbi->ll_pglist); - spin_unlock(&sbi->ll_lock); + if (start > point) + start = 0; + if (end < point) + end = ~0; -out: - llap->llap_origin = origin; - RETURN(llap); + return start <= index && index <= end; } -static int queue_or_sync_write(struct obd_export *exp, - struct lov_stripe_md *lsm, - struct ll_async_page *llap, - unsigned to, - obd_flags async_flags) +static struct ll_readahead_state *ll_ras_get(struct file *f) { - struct obd_io_group *oig; - int rc; - ENTRY; - - /* _make_ready only sees llap once we've unlocked the page */ - llap->llap_write_queued = 1; - rc = obd_queue_async_io(exp, lsm, NULL, llap->llap_cookie, - OBD_BRW_WRITE, 0, 0, 0, async_flags); - if (rc == 0) { - LL_CDEBUG_PAGE(D_PAGE, llap->llap_page, "write queued\n"); - llap_write_pending(llap->llap_page->mapping->host, llap); - GOTO(out, 0); - } - - llap->llap_write_queued = 0; - - rc = oig_init(&oig); - if (rc) - GOTO(out, rc); - rc = obd_queue_group_io(exp, lsm, NULL, oig, llap->llap_cookie, - OBD_BRW_WRITE, 0, to, 0, ASYNC_READY | - ASYNC_URGENT | ASYNC_COUNT_STABLE | - ASYNC_GROUP_SYNC); - if (rc) - GOTO(free_oig, rc); - - rc = obd_trigger_group_io(exp, lsm, NULL, oig); - if (rc) - GOTO(free_oig, rc); - - rc = oig_wait(oig); + struct ll_file_data *fd; - if (!rc && async_flags & ASYNC_READY) - unlock_page(llap->llap_page); - - LL_CDEBUG_PAGE(D_PAGE, llap->llap_page, - "sync write returned %d\n", rc); - - EXIT; -free_oig: - oig_release(oig); -out: - return rc; + fd = LUSTRE_FPRIVATE(f); + return &fd->fd_ras; } -/* be careful not to return success without setting the page Uptodate or - * the next pass through prepare_write will read in stale data from disk. */ -int ll_commit_write(struct file *file, struct page *page, unsigned from, - unsigned to) +void ll_ra_read_in(struct file *f, struct ll_ra_read *rar) { - struct inode *inode = page->mapping->host; - struct ll_inode_info *lli = ll_i2info(inode); - struct lov_stripe_md *lsm = lli->lli_smd; - struct obd_export *exp = NULL; - struct ll_async_page *llap; - loff_t size; - int rc = 0; - ENTRY; + struct ll_readahead_state *ras; - SIGNAL_MASK_ASSERT(); /* XXX BUG 1511 */ - LASSERT(inode == file->f_dentry->d_inode); - LASSERT(PageLocked(page)); - LASSERT(LLI_DIRTY_HANDLE(inode)); + ras = ll_ras_get(f); - CDEBUG(D_INODE, "inode %p is writing page %p from %d to %d at %lu\n", - inode, page, from, to, page->index); + cfs_spin_lock(&ras->ras_lock); + ras->ras_requests++; + ras->ras_request_index = 0; + ras->ras_consecutive_requests++; + rar->lrr_reader = current; - llap = llap_from_page(page, LLAP_ORIGIN_COMMIT_WRITE); - if (IS_ERR(llap)) - RETURN(PTR_ERR(llap)); + cfs_list_add(&rar->lrr_linkage, &ras->ras_read_beads); + cfs_spin_unlock(&ras->ras_lock); +} - exp = ll_i2dtexp(inode); - if (exp == NULL) - RETURN(-EINVAL); +void ll_ra_read_ex(struct file *f, struct ll_ra_read *rar) +{ + struct ll_readahead_state *ras; - llap->llap_fsuid = current->fsuid; + ras = ll_ras_get(f); - /* queue a write for some time in the future the first time we - * dirty the page */ - if (!PageDirty(page)) { - lprocfs_counter_incr(ll_i2sbi(inode)->ll_stats, - LPROC_LL_DIRTY_MISSES); + cfs_spin_lock(&ras->ras_lock); + cfs_list_del_init(&rar->lrr_linkage); + cfs_spin_unlock(&ras->ras_lock); +} - rc = queue_or_sync_write(exp, ll_i2info(inode)->lli_smd, - llap, to, 0); - if (rc) - GOTO(out, rc); - } else { - lprocfs_counter_incr(ll_i2sbi(inode)->ll_stats, - LPROC_LL_DIRTY_HITS); - } +static struct ll_ra_read *ll_ra_read_get_locked(struct ll_readahead_state *ras) +{ + struct ll_ra_read *scan; - /* put the page in the page cache, from now on ll_removepage is - * responsible for cleaning up the llap. - * don't dirty the page if it has been write out in q_o_s_w */ - if (llap->llap_write_queued) - set_page_dirty(page); - EXIT; -out: - size = (((obd_off)page->index) << PAGE_SHIFT) + to; - down(&lli->lli_size_sem); - if (rc == 0) { - obd_adjust_kms(exp, lsm, size, 0); - if (size > inode->i_size) - inode->i_size = size; - SetPageUptodate(page); - } else if (size > inode->i_size) { - /* this page beyond the pales of i_size, so it can't be - * truncated in ll_p_r_e during lock revoking. we must - * teardown our book-keeping here. */ - ll_removepage(page); + cfs_list_for_each_entry(scan, &ras->ras_read_beads, lrr_linkage) { + if (scan->lrr_reader == current) + return scan; } - up(&lli->lli_size_sem); - return rc; + return NULL; } -static unsigned long ll_ra_count_get(struct ll_sb_info *sbi, unsigned long len) +struct ll_ra_read *ll_ra_read_get(struct file *f) { - struct ll_ra_info *ra = &sbi->ll_ra_info; - unsigned long ret; - ENTRY; + struct ll_readahead_state *ras; + struct ll_ra_read *bead; - spin_lock(&sbi->ll_lock); - ret = min(ra->ra_max_pages - ra->ra_cur_pages, len); - ra->ra_cur_pages += ret; - spin_unlock(&sbi->ll_lock); + ras = ll_ras_get(f); - RETURN(ret); + cfs_spin_lock(&ras->ras_lock); + bead = ll_ra_read_get_locked(ras); + cfs_spin_unlock(&ras->ras_lock); + return bead; } -static void ll_ra_count_put(struct ll_sb_info *sbi, unsigned long len) +static int cl_read_ahead_page(const struct lu_env *env, struct cl_io *io, + struct cl_page_list *queue, struct cl_page *page, + struct page *vmpage) { - struct ll_ra_info *ra = &sbi->ll_ra_info; - spin_lock(&sbi->ll_lock); - LASSERTF(ra->ra_cur_pages >= len, "r_c_p %lu len %lu\n", - ra->ra_cur_pages, len); - ra->ra_cur_pages -= len; - spin_unlock(&sbi->ll_lock); -} + struct ccc_page *cp; + int rc; -int ll_writepage(struct page *page) -{ - struct inode *inode = page->mapping->host; - struct obd_export *exp; - struct ll_async_page *llap; - int rc = 0; ENTRY; - LASSERT(!PageDirty(page)); - LASSERT(PageLocked(page)); - LASSERT(LLI_DIRTY_HANDLE(inode)); - - exp = ll_i2dtexp(inode); - if (exp == NULL) - GOTO(out, rc = -EINVAL); - - llap = llap_from_page(page, LLAP_ORIGIN_WRITEPAGE); - if (IS_ERR(llap)) - GOTO(out, rc = PTR_ERR(llap)); - - page_cache_get(page); - if (llap->llap_write_queued) { - LL_CDEBUG_PAGE(D_PAGE, page, "marking urgent\n"); - rc = obd_set_async_flags(exp, ll_i2info(inode)->lli_smd, NULL, - llap->llap_cookie, - ASYNC_READY | ASYNC_URGENT); - } else { - rc = queue_or_sync_write(exp, ll_i2info(inode)->lli_smd, llap, - PAGE_SIZE, ASYNC_READY | - ASYNC_URGENT); - } - if (rc) - page_cache_release(page); - EXIT; -out: - if (rc) - unlock_page(page); - return rc; + rc = 0; + cl_page_assume(env, io, page); + lu_ref_add(&page->cp_reference, "ra", cfs_current()); + cp = cl2ccc_page(cl_page_at(page, &vvp_device_type)); + if (!cp->cpg_defer_uptodate && !Page_Uptodate(vmpage)) { + rc = cl_page_is_under_lock(env, io, page); + if (rc == -EBUSY) { + cp->cpg_defer_uptodate = 1; + cp->cpg_ra_used = 0; + cl_page_list_add(queue, page); + rc = 1; + } else { + cl_page_delete(env, page); + rc = -ENOLCK; + } + } else + /* skip completed pages */ + cl_page_unassume(env, io, page); + lu_ref_del(&page->cp_reference, "ra", cfs_current()); + cl_page_put(env, page); + RETURN(rc); } -/* called for each page in a completed rpc.*/ -void ll_ap_completion(void *data, int cmd, struct obdo *oa, int rc) +/** + * Initiates read-ahead of a page with given index. + * + * \retval +ve: page was added to \a queue. + * + * \retval -ENOLCK: there is no extent lock for this part of a file, stop + * read-ahead. + * + * \retval -ve, 0: page wasn't added to \a queue for other reason. + */ +static int ll_read_ahead_page(const struct lu_env *env, struct cl_io *io, + struct cl_page_list *queue, + pgoff_t index, struct address_space *mapping) { - struct ll_async_page *llap; - struct page *page; - ENTRY; + struct page *vmpage; + struct cl_object *clob = ll_i2info(mapping->host)->lli_clob; + struct cl_page *page; + enum ra_stat which = _NR_RA_STAT; /* keep gcc happy */ + unsigned int gfp_mask; + int rc = 0; + const char *msg = NULL; - llap = LLAP_FROM_COOKIE(data); - page = llap->llap_page; - LASSERT(PageLocked(page)); - - LL_CDEBUG_PAGE(D_PAGE, page, "completing cmd %d with %d\n", cmd, rc); - - if (cmd == OBD_BRW_READ && llap->llap_defer_uptodate) - ll_ra_count_put(ll_i2sbi(page->mapping->host), 1); + ENTRY; - if (rc == 0) { - if (cmd == OBD_BRW_READ) { - if (!llap->llap_defer_uptodate) - SetPageUptodate(page); + gfp_mask = GFP_HIGHUSER & ~__GFP_WAIT; +#ifdef __GFP_NOWARN + gfp_mask |= __GFP_NOWARN; +#endif + vmpage = grab_cache_page_nowait_gfp(mapping, index, gfp_mask); + if (vmpage != NULL) { + /* Check if vmpage was truncated or reclaimed */ + if (vmpage->mapping == mapping) { + page = cl_page_find(env, clob, vmpage->index, + vmpage, CPT_CACHEABLE); + if (!IS_ERR(page)) { + rc = cl_read_ahead_page(env, io, queue, + page, vmpage); + if (rc == -ENOLCK) { + which = RA_STAT_FAILED_MATCH; + msg = "lock match failed"; + } + } else { + which = RA_STAT_FAILED_GRAB_PAGE; + msg = "cl_page_find failed"; + } } else { - llap->llap_write_queued = 0; + which = RA_STAT_WRONG_GRAB_PAGE; + msg = "g_c_p_n returned invalid page"; } - ClearPageError(page); + if (rc != 1) + unlock_page(vmpage); + page_cache_release(vmpage); } else { - if (cmd == OBD_BRW_READ) - llap->llap_defer_uptodate = 0; - SetPageError(page); + which = RA_STAT_FAILED_GRAB_PAGE; + msg = "g_c_p_n failed"; } - - unlock_page(page); - - if (cmd == OBD_BRW_WRITE) { - llap_write_complete(page->mapping->host, llap); - ll_try_done_writing(page->mapping->host); + if (msg != NULL) { + ll_ra_stats_inc(mapping, which); + CDEBUG(D_READA, "%s\n", msg); } - - if (PageWriteback(page)) { - end_page_writeback(page); - } - page_cache_release(page); - EXIT; + RETURN(rc); } -/* the kernel calls us here when a page is unhashed from the page cache. - * the page will be locked and the kernel is holding a spinlock, so - * we need to be careful. we're just tearing down our book-keeping - * here. */ -void ll_removepage(struct page *page) -{ - struct inode *inode = page->mapping->host; - struct obd_export *exp; - struct ll_async_page *llap; - struct ll_sb_info *sbi = ll_i2sbi(inode); - int rc; - ENTRY; +#define RIA_DEBUG(ria) \ + CDEBUG(D_READA, "rs %lu re %lu ro %lu rl %lu rp %lu\n", \ + ria->ria_start, ria->ria_end, ria->ria_stoff, ria->ria_length,\ + ria->ria_pages) - LASSERT(!in_interrupt()); +#define RAS_INCREASE_STEP PTLRPC_MAX_BRW_PAGES - /* sync pages or failed read pages can leave pages in the page - * cache that don't have our data associated with them anymore */ - if (page->private == 0) { - EXIT; - return; - } +static inline int stride_io_mode(struct ll_readahead_state *ras) +{ + return ras->ras_consecutive_stride_requests > 1; +} +/* The function calculates how much pages will be read in + * [off, off + length], in such stride IO area, + * stride_offset = st_off, stride_lengh = st_len, + * stride_pages = st_pgs + * + * |------------------|*****|------------------|*****|------------|*****|.... + * st_off + * |--- st_pgs ---| + * |----- st_len -----| + * + * How many pages it should read in such pattern + * |-------------------------------------------------------------| + * off + * |<------ length ------->| + * + * = |<----->| + |-------------------------------------| + |---| + * start_left st_pgs * i end_left + */ +static unsigned long +stride_pg_count(pgoff_t st_off, unsigned long st_len, unsigned long st_pgs, + unsigned long off, unsigned long length) +{ + __u64 start = off > st_off ? off - st_off : 0; + __u64 end = off + length > st_off ? off + length - st_off : 0; + unsigned long start_left = 0; + unsigned long end_left = 0; + unsigned long pg_count; + + if (st_len == 0 || length == 0 || end == 0) + return length; + + start_left = do_div(start, st_len); + if (start_left < st_pgs) + start_left = st_pgs - start_left; + else + start_left = 0; - LL_CDEBUG_PAGE(D_PAGE, page, "being evicted\n"); + end_left = do_div(end, st_len); + if (end_left > st_pgs) + end_left = st_pgs; - exp = ll_i2dtexp(inode); - if (exp == NULL) { - CERROR("page %p ind %lu gave null export\n", page, page->index); - EXIT; - return; - } - llap = llap_from_page(page, 0); - if (IS_ERR(llap)) { - CERROR("page %p ind %lu couldn't find llap: %ld\n", page, - page->index, PTR_ERR(llap)); - EXIT; - return; - } + CDEBUG(D_READA, "start "LPU64", end "LPU64" start_left %lu end_left %lu \n", + start, end, start_left, end_left); - llap_write_complete(inode, llap); - rc = obd_teardown_async_page(exp, ll_i2info(inode)->lli_smd, NULL, - llap->llap_cookie); - if (rc != 0) - CERROR("page %p ind %lu failed: %d\n", page, page->index, rc); - - /* this unconditional free is only safe because the page lock - * is providing exclusivity to memory pressure/truncate/writeback..*/ - __clear_page_ll_data(page); - - spin_lock(&sbi->ll_lock); - if (!list_empty(&llap->llap_proc_item)) - list_del_init(&llap->llap_proc_item); - sbi->ll_pglist_gen++; - spin_unlock(&sbi->ll_lock); - OBD_FREE(llap, sizeof(*llap)); - EXIT; -} + if (start == end) + pg_count = end_left - (st_pgs - start_left); + else + pg_count = start_left + st_pgs * (end - start - 1) + end_left; -static int ll_page_matches(struct page *page, int fd_flags, int readahead) -{ - struct lustre_handle match_lockh = {0}; - struct inode *inode = page->mapping->host; - ldlm_policy_data_t page_extent; - int flags, matches; - ENTRY; + CDEBUG(D_READA, "st_off %lu, st_len %lu st_pgs %lu off %lu length %lu" + "pgcount %lu\n", st_off, st_len, st_pgs, off, length, pg_count); - if (fd_flags & LL_FILE_GROUP_LOCKED) - RETURN(1); - - page_extent.l_extent.start = (__u64)page->index << PAGE_CACHE_SHIFT; - page_extent.l_extent.end = - page_extent.l_extent.start + PAGE_CACHE_SIZE - 1; - flags = LDLM_FL_TEST_LOCK; - if (!readahead) - flags |= LDLM_FL_CBPENDING | LDLM_FL_BLOCK_GRANTED; - matches = obd_match(ll_i2sbi(inode)->ll_dt_exp, - ll_i2info(inode)->lli_smd, LDLM_EXTENT, - &page_extent, LCK_PR | LCK_PW, &flags, inode, - &match_lockh); - RETURN(matches); + return pg_count; } -static int ll_issue_page_read(struct obd_export *exp, - struct ll_async_page *llap, - struct obd_io_group *oig, int defer) +static int ria_page_count(struct ra_io_arg *ria) { - struct page *page = llap->llap_page; - int rc; - - page_cache_get(page); - llap->llap_defer_uptodate = defer; - llap->llap_ra_used = 0; - - rc = obd_queue_group_io(exp, ll_i2info(page->mapping->host)->lli_smd, - NULL, oig, llap->llap_cookie, OBD_BRW_READ, 0, - PAGE_SIZE, 0, ASYNC_COUNT_STABLE | ASYNC_READY - | ASYNC_URGENT); - if (rc) { - LL_CDEBUG_PAGE(D_ERROR, page, "read queue failed: rc %d\n", rc); - page_cache_release(page); - } - RETURN(rc); -} + __u64 length = ria->ria_end >= ria->ria_start ? + ria->ria_end - ria->ria_start + 1 : 0; -static void ll_ra_stats_inc_unlocked(struct ll_ra_info *ra, enum ra_stat which) -{ - LASSERTF(which >= 0 && which < _NR_RA_STAT, "which: %u\n", which); - ra->ra_stats[which]++; + return stride_pg_count(ria->ria_stoff, ria->ria_length, + ria->ria_pages, ria->ria_start, + length); } -static void ll_ra_stats_inc(struct address_space *mapping, enum ra_stat which) +/*Check whether the index is in the defined ra-window */ +static int ras_inside_ra_window(unsigned long idx, struct ra_io_arg *ria) { - struct ll_sb_info *sbi = ll_i2sbi(mapping->host); - struct ll_ra_info *ra = &ll_i2sbi(mapping->host)->ll_ra_info; - - spin_lock(&sbi->ll_lock); - ll_ra_stats_inc_unlocked(ra, which); - spin_unlock(&sbi->ll_lock); + /* If ria_length == ria_pages, it means non-stride I/O mode, + * idx should always inside read-ahead window in this case + * For stride I/O mode, just check whether the idx is inside + * the ria_pages. */ + return ria->ria_length == 0 || ria->ria_length == ria->ria_pages || + (idx >= ria->ria_stoff && (idx - ria->ria_stoff) % + ria->ria_length < ria->ria_pages); } -void ll_ra_accounting(struct page *page, struct address_space *mapping) +static int ll_read_ahead_pages(const struct lu_env *env, + struct cl_io *io, struct cl_page_list *queue, + struct ra_io_arg *ria, + unsigned long *reserved_pages, + struct address_space *mapping, + unsigned long *ra_end) { - struct ll_async_page *llap; - - llap = llap_from_page(page, LLAP_ORIGIN_WRITEPAGE); - if (IS_ERR(llap)) - return; - - if (!llap->llap_defer_uptodate || llap->llap_ra_used) - return; - - ll_ra_stats_inc(mapping, RA_STAT_DISCARDED); + int rc, count = 0, stride_ria; + unsigned long page_idx; + + LASSERT(ria != NULL); + RIA_DEBUG(ria); + + stride_ria = ria->ria_length > ria->ria_pages && ria->ria_pages > 0; + for (page_idx = ria->ria_start; page_idx <= ria->ria_end && + *reserved_pages > 0; page_idx++) { + if (ras_inside_ra_window(page_idx, ria)) { + /* If the page is inside the read-ahead window*/ + rc = ll_read_ahead_page(env, io, queue, + page_idx, mapping); + if (rc == 1) { + (*reserved_pages)--; + count ++; + } else if (rc == -ENOLCK) + break; + } else if (stride_ria) { + /* If it is not in the read-ahead window, and it is + * read-ahead mode, then check whether it should skip + * the stride gap */ + pgoff_t offset; + /* FIXME: This assertion only is valid when it is for + * forward read-ahead, it will be fixed when backward + * read-ahead is implemented */ + LASSERTF(page_idx > ria->ria_stoff, "Invalid page_idx %lu" + "rs %lu re %lu ro %lu rl %lu rp %lu\n", page_idx, + ria->ria_start, ria->ria_end, ria->ria_stoff, + ria->ria_length, ria->ria_pages); + offset = page_idx - ria->ria_stoff; + offset = offset % (ria->ria_length); + if (offset > ria->ria_pages) { + page_idx += ria->ria_length - offset; + CDEBUG(D_READA, "i %lu skip %lu \n", page_idx, + ria->ria_length - offset); + continue; + } + } + } + *ra_end = page_idx; + return count; } -#define RAS_CDEBUG(ras) \ - CDEBUG(D_READA, "lrp %lu c %lu ws %lu wl %lu nra %lu\n", \ - ras->ras_last_readpage, ras->ras_consecutive, \ - ras->ras_window_start, ras->ras_window_len, \ - ras->ras_next_readahead); - -static int index_in_window(unsigned long index, unsigned long point, - unsigned long before, unsigned long after) +int ll_readahead(const struct lu_env *env, struct cl_io *io, + struct ll_readahead_state *ras, struct address_space *mapping, + struct cl_page_list *queue, int flags) { - unsigned long start = point - before, end = point + after; + struct vvp_io *vio = vvp_env_io(env); + struct vvp_thread_info *vti = vvp_env_info(env); + struct cl_attr *attr = ccc_env_thread_attr(env); + unsigned long start = 0, end = 0, reserved; + unsigned long ra_end, len; + struct inode *inode; + struct ll_ra_read *bead; + struct ra_io_arg *ria = &vti->vti_ria; + struct ll_inode_info *lli; + struct cl_object *clob; + int ret = 0; + __u64 kms; + ENTRY; - if (start > point) - start = 0; - if (end < point) - end = ~0; + inode = mapping->host; + lli = ll_i2info(inode); + clob = lli->lli_clob; - return start <= index && index <= end; -} + memset(ria, 0, sizeof *ria); -static int ll_readahead(struct ll_readahead_state *ras, - struct obd_export *exp, struct address_space *mapping, - struct obd_io_group *oig, int flags) -{ - unsigned long i, start = 0, end = 0, reserved; - struct ll_async_page *llap; - struct page *page; - int rc, ret = 0, match_failed = 0; - __u64 kms; - ENTRY; + cl_object_attr_lock(clob); + ret = cl_object_attr_get(env, clob, attr); + cl_object_attr_unlock(clob); - kms = lov_merge_size(ll_i2info(mapping->host)->lli_smd, 1); + if (ret != 0) + RETURN(ret); + kms = attr->cat_kms; if (kms == 0) { ll_ra_stats_inc(mapping, RA_STAT_ZERO_LEN); RETURN(0); } - spin_lock(&ras->ras_lock); - /* reserve a part of the read-ahead window that we'll be issuing */ + cfs_spin_lock(&ras->ras_lock); + if (vio->cui_ra_window_set) + bead = &vio->cui_bead; + else + bead = NULL; + + /* Enlarge the RA window to encompass the full read */ + if (bead != NULL && ras->ras_window_start + ras->ras_window_len < + bead->lrr_start + bead->lrr_count) { + ras->ras_window_len = bead->lrr_start + bead->lrr_count - + ras->ras_window_start; + } + /* Reserve a part of the read-ahead window that we'll be issuing */ if (ras->ras_window_len) { start = ras->ras_next_readahead; end = ras->ras_window_start + ras->ras_window_len - 1; - end = min(end, (unsigned long)(kms >> PAGE_CACHE_SHIFT)); - ras->ras_next_readahead = max(end, end + 1); + } + if (end != 0) { + unsigned long tmp_end; + /* + * Align RA window to an optimal boundary. + * + * XXX This would be better to align to cl_max_pages_per_rpc + * instead of PTLRPC_MAX_BRW_PAGES, because the RPC size may + * be aligned to the RAID stripe size in the future and that + * is more important than the RPC size. + */ + tmp_end = ((end + 1) & (~(PTLRPC_MAX_BRW_PAGES - 1))) - 1; + if (tmp_end > start) + end = tmp_end; + + /* Truncate RA window to end of file */ + end = min(end, (unsigned long)((kms - 1) >> CFS_PAGE_SHIFT)); + ras->ras_next_readahead = max(end, end + 1); RAS_CDEBUG(ras); } - - spin_unlock(&ras->ras_lock); + ria->ria_start = start; + ria->ria_end = end; + /* If stride I/O mode is detected, get stride window*/ + if (stride_io_mode(ras)) { + ria->ria_stoff = ras->ras_stride_offset; + ria->ria_length = ras->ras_stride_length; + ria->ria_pages = ras->ras_stride_pages; + } + cfs_spin_unlock(&ras->ras_lock); if (end == 0) { ll_ra_stats_inc(mapping, RA_STAT_ZERO_WINDOW); RETURN(0); } + len = ria_page_count(ria); + if (len == 0) + RETURN(0); - reserved = ll_ra_count_get(ll_i2sbi(mapping->host), end - start + 1); - if (reserved < end - start + 1) - ll_ra_stats_inc(mapping, RA_STAT_MAX_IN_FLIGHT); - - for (i = start; reserved > 0 && !match_failed && i <= end; i++) { - /* skip locked pages from previous readpage calls */ - page = grab_cache_page_nowait(mapping, i); - if (page == NULL) { - CDEBUG(D_READA, "g_c_p_n failed\n"); - continue; - } - - /* we do this first so that we can see the page in the /proc - * accounting */ - llap = llap_from_page(page, LLAP_ORIGIN_READAHEAD); - if (IS_ERR(llap) || llap->llap_defer_uptodate) - goto next_page; + reserved = ll_ra_count_get(ll_i2sbi(inode), len); - /* skip completed pages */ - if (Page_Uptodate(page)) - goto next_page; - - /* bail when we hit the end of the lock. */ - if ((rc = ll_page_matches(page, flags, 1)) <= 0) { - LL_CDEBUG_PAGE(D_READA | D_PAGE, page, - "lock match failed: rc %d\n", rc); - ll_ra_stats_inc(mapping, RA_STAT_FAILED_MATCH); - match_failed = 1; - goto next_page; - } + if (reserved < len) + ll_ra_stats_inc(mapping, RA_STAT_MAX_IN_FLIGHT); - rc = ll_issue_page_read(exp, llap, oig, 1); - if (rc == 0) { - reserved--; - ret++; - LL_CDEBUG_PAGE(D_READA| D_PAGE, page, - "started read-ahead\n"); - } - if (rc) { - next_page: - LL_CDEBUG_PAGE(D_READA | D_PAGE, page, - "skipping read-ahead\n"); + CDEBUG(D_READA, "reserved page %lu \n", reserved); - unlock_page(page); - } - page_cache_release(page); - } + ret = ll_read_ahead_pages(env, io, queue, + ria, &reserved, mapping, &ra_end); LASSERTF(reserved >= 0, "reserved %lu\n", reserved); if (reserved != 0) - ll_ra_count_put(ll_i2sbi(mapping->host), reserved); + ll_ra_count_put(ll_i2sbi(inode), reserved); - if (i == end + 1 && end == (kms >> PAGE_CACHE_SHIFT)) + if (ra_end == end + 1 && ra_end == (kms >> CFS_PAGE_SHIFT)) ll_ra_stats_inc(mapping, RA_STAT_EOF); /* if we didn't get to the end of the region we reserved from @@ -928,15 +806,18 @@ static int ll_readahead(struct ll_readahead_state *ras, * next read-ahead tries from where we left off. we only do so * if the region we failed to issue read-ahead on is still ahead * of the app and behind the next index to start read-ahead from */ - if (i != end + 1) { - spin_lock(&ras->ras_lock); - if (i < ras->ras_next_readahead && - index_in_window(i, ras->ras_window_start, 0, + CDEBUG(D_READA, "ra_end %lu end %lu stride end %lu \n", + ra_end, end, ria->ria_end); + + if (ra_end != end + 1) { + cfs_spin_lock(&ras->ras_lock); + if (ra_end < ras->ras_next_readahead && + index_in_window(ra_end, ras->ras_window_start, 0, ras->ras_window_len)) { - ras->ras_next_readahead = i; - RAS_CDEBUG(ras); + ras->ras_next_readahead = ra_end; + RAS_CDEBUG(ras); } - spin_unlock(&ras->ras_lock); + cfs_spin_unlock(&ras->ras_lock); } RETURN(ret); @@ -944,38 +825,161 @@ static int ll_readahead(struct ll_readahead_state *ras, static void ras_set_start(struct ll_readahead_state *ras, unsigned long index) { - ras->ras_window_start = index & (~(PTLRPC_MAX_BRW_PAGES - 1)); + ras->ras_window_start = index & (~(RAS_INCREASE_STEP - 1)); } /* called with the ras_lock held or from places where it doesn't matter */ static void ras_reset(struct ll_readahead_state *ras, unsigned long index) { ras->ras_last_readpage = index; - ras->ras_consecutive = 1; + ras->ras_consecutive_requests = 0; + ras->ras_consecutive_pages = 0; ras->ras_window_len = 0; ras_set_start(ras, index); - ras->ras_next_readahead = ras->ras_window_start; + ras->ras_next_readahead = max(ras->ras_window_start, index); RAS_CDEBUG(ras); } +/* called with the ras_lock held or from places where it doesn't matter */ +static void ras_stride_reset(struct ll_readahead_state *ras) +{ + ras->ras_consecutive_stride_requests = 0; + ras->ras_stride_length = 0; + ras->ras_stride_pages = 0; + RAS_CDEBUG(ras); +} + void ll_readahead_init(struct inode *inode, struct ll_readahead_state *ras) { - spin_lock_init(&ras->ras_lock); + cfs_spin_lock_init(&ras->ras_lock); ras_reset(ras, 0); + ras->ras_requests = 0; + CFS_INIT_LIST_HEAD(&ras->ras_read_beads); +} + +/* + * Check whether the read request is in the stride window. + * If it is in the stride window, return 1, otherwise return 0. + */ +static int index_in_stride_window(unsigned long index, + struct ll_readahead_state *ras, + struct inode *inode) +{ + unsigned long stride_gap = index - ras->ras_last_readpage - 1; + + if (ras->ras_stride_length == 0 || ras->ras_stride_pages == 0 || + ras->ras_stride_pages == ras->ras_stride_length) + return 0; + + /* If it is contiguous read */ + if (stride_gap == 0) + return ras->ras_consecutive_pages + 1 <= ras->ras_stride_pages; + + /*Otherwise check the stride by itself */ + return (ras->ras_stride_length - ras->ras_stride_pages) == stride_gap && + ras->ras_consecutive_pages == ras->ras_stride_pages; +} + +static void ras_update_stride_detector(struct ll_readahead_state *ras, + unsigned long index) +{ + unsigned long stride_gap = index - ras->ras_last_readpage - 1; + + if (!stride_io_mode(ras) && (stride_gap != 0 || + ras->ras_consecutive_stride_requests == 0)) { + ras->ras_stride_pages = ras->ras_consecutive_pages; + ras->ras_stride_length = stride_gap +ras->ras_consecutive_pages; + } + LASSERT(ras->ras_request_index == 0); + LASSERT(ras->ras_consecutive_stride_requests == 0); + + if (index <= ras->ras_last_readpage) { + /*Reset stride window for forward read*/ + ras_stride_reset(ras); + return; + } + + ras->ras_stride_pages = ras->ras_consecutive_pages; + ras->ras_stride_length = stride_gap +ras->ras_consecutive_pages; + + RAS_CDEBUG(ras); + return; +} + +static unsigned long +stride_page_count(struct ll_readahead_state *ras, unsigned long len) +{ + return stride_pg_count(ras->ras_stride_offset, ras->ras_stride_length, + ras->ras_stride_pages, ras->ras_stride_offset, + len); +} + +/* Stride Read-ahead window will be increased inc_len according to + * stride I/O pattern */ +static void ras_stride_increase_window(struct ll_readahead_state *ras, + struct ll_ra_info *ra, + unsigned long inc_len) +{ + unsigned long left, step, window_len; + unsigned long stride_len; + + LASSERT(ras->ras_stride_length > 0); + LASSERTF(ras->ras_window_start + ras->ras_window_len + >= ras->ras_stride_offset, "window_start %lu, window_len %lu" + " stride_offset %lu\n", ras->ras_window_start, + ras->ras_window_len, ras->ras_stride_offset); + + stride_len = ras->ras_window_start + ras->ras_window_len - + ras->ras_stride_offset; + + left = stride_len % ras->ras_stride_length; + window_len = ras->ras_window_len - left; + + if (left < ras->ras_stride_pages) + left += inc_len; + else + left = ras->ras_stride_pages + inc_len; + + LASSERT(ras->ras_stride_pages != 0); + + step = left / ras->ras_stride_pages; + left %= ras->ras_stride_pages; + + window_len += step * ras->ras_stride_length + left; + + if (stride_page_count(ras, window_len) <= ra->ra_max_pages_per_file) + ras->ras_window_len = window_len; + + RAS_CDEBUG(ras); +} + +static void ras_increase_window(struct ll_readahead_state *ras, + struct ll_ra_info *ra, struct inode *inode) +{ + /* The stretch of ra-window should be aligned with max rpc_size + * but current clio architecture does not support retrieve such + * information from lower layer. FIXME later + */ + if (stride_io_mode(ras)) + ras_stride_increase_window(ras, ra, RAS_INCREASE_STEP); + else + ras->ras_window_len = min(ras->ras_window_len + + RAS_INCREASE_STEP, + ra->ra_max_pages_per_file); } -static void ras_update(struct ll_sb_info *sbi, struct ll_readahead_state *ras, - unsigned long index, unsigned hit) +void ras_update(struct ll_sb_info *sbi, struct inode *inode, + struct ll_readahead_state *ras, unsigned long index, + unsigned hit) { struct ll_ra_info *ra = &sbi->ll_ra_info; - int zero = 0; + int zero = 0, stride_detect = 0, ra_miss = 0; ENTRY; - spin_lock(&sbi->ll_lock); - spin_lock(&ras->ras_lock); - - ll_ra_stats_inc_unlocked(ra, hit ? RA_STAT_HIT : RA_STAT_MISS); + cfs_spin_lock(&ras->ras_lock); + + ll_ra_stats_inc_sbi(sbi, hit ? RA_STAT_HIT : RA_STAT_MISS); /* reset the read-ahead window in two cases. First when the app seeks * or reads to some other part of the file. Secondly if we get a @@ -984,134 +988,238 @@ static void ras_update(struct ll_sb_info *sbi, struct ll_readahead_state *ras, * reclaiming it before we get to it. */ if (!index_in_window(index, ras->ras_last_readpage, 8, 8)) { zero = 1; - ll_ra_stats_inc_unlocked(ra, RA_STAT_DISTANT_READPAGE); + ll_ra_stats_inc_sbi(sbi, RA_STAT_DISTANT_READPAGE); } else if (!hit && ras->ras_window_len && index < ras->ras_next_readahead && index_in_window(index, ras->ras_window_start, 0, ras->ras_window_len)) { - zero = 1; - ll_ra_stats_inc_unlocked(ra, RA_STAT_MISS_IN_WINDOW); + ra_miss = 1; + ll_ra_stats_inc_sbi(sbi, RA_STAT_MISS_IN_WINDOW); } + /* On the second access to a file smaller than the tunable + * ra_max_read_ahead_whole_pages trigger RA on all pages in the + * file up to ra_max_pages_per_file. This is simply a best effort + * and only occurs once per open file. Normal RA behavior is reverted + * to for subsequent IO. The mmap case does not increment + * ras_requests and thus can never trigger this behavior. */ + if (ras->ras_requests == 2 && !ras->ras_request_index) { + __u64 kms_pages; + + kms_pages = (i_size_read(inode) + CFS_PAGE_SIZE - 1) >> + CFS_PAGE_SHIFT; + + CDEBUG(D_READA, "kmsp "LPU64" mwp %lu mp %lu\n", kms_pages, + ra->ra_max_read_ahead_whole_pages, ra->ra_max_pages_per_file); + + if (kms_pages && + kms_pages <= ra->ra_max_read_ahead_whole_pages) { + ras->ras_window_start = 0; + ras->ras_last_readpage = 0; + ras->ras_next_readahead = 0; + ras->ras_window_len = min(ra->ra_max_pages_per_file, + ra->ra_max_read_ahead_whole_pages); + GOTO(out_unlock, 0); + } + } if (zero) { - ras_reset(ras, index); - GOTO(out_unlock, 0); + /* check whether it is in stride I/O mode*/ + if (!index_in_stride_window(index, ras, inode)) { + if (ras->ras_consecutive_stride_requests == 0 && + ras->ras_request_index == 0) { + ras_update_stride_detector(ras, index); + ras->ras_consecutive_stride_requests ++; + } else { + ras_stride_reset(ras); + } + ras_reset(ras, index); + ras->ras_consecutive_pages++; + GOTO(out_unlock, 0); + } else { + ras->ras_consecutive_pages = 0; + ras->ras_consecutive_requests = 0; + if (++ras->ras_consecutive_stride_requests > 1) + stride_detect = 1; + RAS_CDEBUG(ras); + } + } else { + if (ra_miss) { + if (index_in_stride_window(index, ras, inode) && + stride_io_mode(ras)) { + /*If stride-RA hit cache miss, the stride dector + *will not be reset to avoid the overhead of + *redetecting read-ahead mode */ + if (index != ras->ras_last_readpage + 1) + ras->ras_consecutive_pages = 0; + ras_reset(ras, index); + RAS_CDEBUG(ras); + } else { + /* Reset both stride window and normal RA + * window */ + ras_reset(ras, index); + ras->ras_consecutive_pages++; + ras_stride_reset(ras); + GOTO(out_unlock, 0); + } + } else if (stride_io_mode(ras)) { + /* If this is contiguous read but in stride I/O mode + * currently, check whether stride step still is valid, + * if invalid, it will reset the stride ra window*/ + if (!index_in_stride_window(index, ras, inode)) { + /* Shrink stride read-ahead window to be zero */ + ras_stride_reset(ras); + ras->ras_window_len = 0; + ras->ras_next_readahead = index; + } + } } - + ras->ras_consecutive_pages++; ras->ras_last_readpage = index; - ras->ras_consecutive++; ras_set_start(ras, index); - ras->ras_next_readahead = max(ras->ras_window_start, - ras->ras_next_readahead); - /* wait for a few pages to arrive before issuing readahead to avoid - * the worst overutilization */ - if (ras->ras_consecutive == 3) { - ras->ras_window_len = PTLRPC_MAX_BRW_PAGES; + if (stride_io_mode(ras)) + /* Since stride readahead is sentivite to the offset + * of read-ahead, so we use original offset here, + * instead of ras_window_start, which is 1M aligned*/ + ras->ras_next_readahead = max(index, + ras->ras_next_readahead); + else + ras->ras_next_readahead = max(ras->ras_window_start, + ras->ras_next_readahead); + RAS_CDEBUG(ras); + + /* Trigger RA in the mmap case where ras_consecutive_requests + * is not incremented and thus can't be used to trigger RA */ + if (!ras->ras_window_len && ras->ras_consecutive_pages == 4) { + ras->ras_window_len = RAS_INCREASE_STEP; GOTO(out_unlock, 0); } - /* we need to increase the window sometimes. we'll arbitrarily - * do it half-way through the pages in an rpc */ - if ((index & (PTLRPC_MAX_BRW_PAGES - 1)) == - (PTLRPC_MAX_BRW_PAGES >> 1)) { - ras->ras_window_len += PTLRPC_MAX_BRW_PAGES; - ras->ras_window_len = min(ras->ras_window_len, - ra->ra_max_pages); - + /* Initially reset the stride window offset to next_readahead*/ + if (ras->ras_consecutive_stride_requests == 2 && stride_detect) { + /** + * Once stride IO mode is detected, next_readahead should be + * reset to make sure next_readahead > stride offset + */ + ras->ras_next_readahead = max(index, ras->ras_next_readahead); + ras->ras_stride_offset = index; + ras->ras_window_len = RAS_INCREASE_STEP; } + /* The initial ras_window_len is set to the request size. To avoid + * uselessly reading and discarding pages for random IO the window is + * only increased once per consecutive request received. */ + if ((ras->ras_consecutive_requests > 1 || stride_detect) && + !ras->ras_request_index) + ras_increase_window(ras, ra, inode); EXIT; out_unlock: RAS_CDEBUG(ras); - spin_unlock(&ras->ras_lock); - spin_unlock(&sbi->ll_lock); + ras->ras_request_index++; + cfs_spin_unlock(&ras->ras_lock); + return; } -/* - * for now we do our readpage the same on both 2.4 and 2.5. The kernel's - * read-ahead assumes it is valid to issue readpage all the way up to - * i_size, but our dlm locks make that not the case. We disable the - * kernel's read-ahead and do our own by walking ahead in the page cache - * checking for dlm lock coverage. the main difference between 2.4 and - * 2.6 is how read-ahead gets batched and issued, but we're using our own, - * so they look the same. - */ -int ll_readpage(struct file *filp, struct page *page) +int ll_writepage(struct page *vmpage, struct writeback_control *unused) { - struct ll_file_data *fd = filp->private_data; - struct inode *inode = page->mapping->host; - struct obd_export *exp; - struct ll_async_page *llap; - struct obd_io_group *oig = NULL; - int rc; + struct inode *inode = vmpage->mapping->host; + struct lu_env *env; + struct cl_io *io; + struct cl_page *page; + struct cl_object *clob; + struct cl_2queue *queue; + struct cl_env_nest nest; + int result; ENTRY; - LASSERT(PageLocked(page)); - LASSERT(!PageUptodate(page)); - CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p),offset="LPX64"\n", - inode->i_ino, inode->i_generation, inode, - (((obd_off)page->index) << PAGE_SHIFT)); - LASSERT(atomic_read(&filp->f_dentry->d_inode->i_count) > 0); - - rc = oig_init(&oig); - if (rc < 0) - GOTO(out, rc); - - exp = ll_i2dtexp(inode); - if (exp == NULL) - GOTO(out, rc = -EINVAL); - - llap = llap_from_page(page, LLAP_ORIGIN_READPAGE); - if (IS_ERR(llap)) - GOTO(out, rc = PTR_ERR(llap)); - - if (ll_i2sbi(inode)->ll_flags & LL_SBI_READAHEAD) - ras_update(ll_i2sbi(inode), &fd->fd_ras, page->index, - llap->llap_defer_uptodate); - - if (llap->llap_defer_uptodate) { - llap->llap_ra_used = 1; - rc = ll_readahead(&fd->fd_ras, exp, page->mapping, oig, - fd->fd_flags); - if (rc > 0) - obd_trigger_group_io(exp, ll_i2info(inode)->lli_smd, - NULL, oig); - LL_CDEBUG_PAGE(D_PAGE, page, "marking uptodate from defer\n"); - SetPageUptodate(page); - unlock_page(page); - GOTO(out_oig, rc = 0); - } + LASSERT(PageLocked(vmpage)); + LASSERT(!PageWriteback(vmpage)); - rc = ll_page_matches(page, fd->fd_flags, 0); - if (rc < 0) { - LL_CDEBUG_PAGE(D_ERROR, page, "lock match failed: rc %d\n", rc); - GOTO(out, rc); - } + if (ll_i2dtexp(inode) == NULL) + RETURN(-EINVAL); - if (rc == 0) { - CWARN("ino %lu page %lu (%llu) not covered by " - "a lock (mmap?). check debug logs.\n", - inode->i_ino, page->index, - (long long)page->index << PAGE_CACHE_SHIFT); + env = cl_env_nested_get(&nest); + if (IS_ERR(env)) + RETURN(PTR_ERR(env)); + + io = &ccc_env_info(env)->cti_io; + queue = &vvp_env_info(env)->vti_queue; + clob = ll_i2info(inode)->lli_clob; + LASSERT(clob != NULL); + + io->ci_obj = clob; + result = cl_io_init(env, io, CIT_MISC, clob); + if (result == 0) { + page = cl_page_find(env, clob, vmpage->index, + vmpage, CPT_CACHEABLE); + if (!IS_ERR(page)) { + lu_ref_add(&page->cp_reference, "writepage", + cfs_current()); + cl_page_assume(env, io, page); + /* + * Mark page dirty, because this is what + * ->vio_submit()->cpo_prep_write() assumes. + * + * XXX better solution is to detect this from within + * cl_io_submit_rw() somehow. + */ + set_page_dirty(vmpage); + cl_2queue_init_page(queue, page); + result = cl_io_submit_rw(env, io, CRT_WRITE, + queue, CRP_NORMAL); + cl_page_list_disown(env, io, &queue->c2_qin); + if (result != 0) { + /* + * There is no need to clear PG_writeback, as + * cl_io_submit_rw() calls completion callback + * on failure. + */ + /* + * Re-dirty page on error so it retries write, + * but not in case when IO has actually + * occurred and completed with an error. + */ + if (!PageError(vmpage)) + set_page_dirty(vmpage); + } + LASSERT(!cl_page_is_owned(page, io)); + lu_ref_del(&page->cp_reference, + "writepage", cfs_current()); + cl_page_put(env, page); + cl_2queue_fini(env, queue); + } } + cl_io_fini(env, io); + cl_env_nested_put(&nest, env); + RETURN(result); +} - rc = ll_issue_page_read(exp, llap, oig, 0); - if (rc) - GOTO(out, rc); +int ll_readpage(struct file *file, struct page *vmpage) +{ + struct ll_cl_context *lcc; + int result; + ENTRY; - LL_CDEBUG_PAGE(D_PAGE, page, "queued readpage\n"); - if (ll_i2sbi(inode)->ll_flags & LL_SBI_READAHEAD) - ll_readahead(&fd->fd_ras, exp, page->mapping, oig, - fd->fd_flags); + lcc = ll_cl_init(file, vmpage, 0); + if (!IS_ERR(lcc)) { + struct lu_env *env = lcc->lcc_env; + struct cl_io *io = lcc->lcc_io; + struct cl_page *page = lcc->lcc_page; - rc = obd_trigger_group_io(exp, ll_i2info(inode)->lli_smd, NULL, oig); - EXIT; -out: - if (rc) - unlock_page(page); -out_oig: - if (oig != NULL) - oig_release(oig); - return rc; + LASSERT(page->cp_type == CPT_CACHEABLE); + if (likely(!PageUptodate(vmpage))) { + cl_page_assume(env, io, page); + result = cl_io_read_page(env, io, page); + } else { + /* Page from a non-object file. */ + LASSERT(!ll_i2info(vmpage->mapping->host)->lli_smd); + unlock_page(vmpage); + result = 0; + } + ll_cl_fini(lcc); + } else { + result = PTR_ERR(lcc); + } + RETURN(result); } +