X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;ds=sidebyside;f=lustre%2Fllite%2Frw.c;h=017ec521df18134663fd5dc36bfec26ba256169a;hb=5900da4464d90468519964571c441382cd512232;hp=18551bcc3c810c5e111b03a7a467aa1ca666eac8;hpb=cbd3a230274e1197d378725ee9e2aed6e35d2cb6;p=fs%2Flustre-release.git diff --git a/lustre/llite/rw.c b/lustre/llite/rw.c index 18551bc..017ec52 100644 --- a/lustre/llite/rw.c +++ b/lustre/llite/rw.c @@ -21,7 +21,9 @@ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ +#ifndef AUTOCONF_INCLUDED #include +#endif #include #include #include @@ -43,8 +45,8 @@ #define DEBUG_SUBSYSTEM S_LLITE -#include -#include +//#include +#include #include "llite_internal.h" #include @@ -54,43 +56,53 @@ pos = n, n = pos->prev ) #endif +cfs_mem_cache_t *ll_async_page_slab = NULL; +size_t ll_async_page_slab_size = 0; + /* 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) { struct ll_inode_info *lli = ll_i2info(inode); struct lov_stripe_md *lsm = lli->lli_smd; + struct obd_info oinfo = { { { 0 } } }; struct brw_page pg; - int rc; + int opc, rc; ENTRY; pg.pg = page; - pg.off = ((obd_off)page->index) << PAGE_SHIFT; + pg.off = ((obd_off)page->index) << CFS_PAGE_SHIFT; - if (cmd == OBD_BRW_WRITE && (pg.off + PAGE_SIZE > inode->i_size)) - pg.count = inode->i_size % PAGE_SIZE; + if ((cmd & OBD_BRW_WRITE) && (pg.off+CFS_PAGE_SIZE>i_size_read(inode))) + pg.count = i_size_read(inode) % CFS_PAGE_SIZE; else - pg.count = PAGE_SIZE; + pg.count = CFS_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.off, pg.off); + LL_CDEBUG_PAGE(D_PAGE, page, "%s %d bytes ino %lu at "LPU64"/"LPX64"\n", + cmd & OBD_BRW_WRITE ? "write" : "read", pg.count, + inode->i_ino, pg.off, pg.off); 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.off); + LPU64"\n", inode->i_ino, inode, i_size_read(inode), + page->mapping->host, i_size_read(page->mapping->host), + page->index, pg.off); } pg.flag = flags; - if (cmd == OBD_BRW_WRITE) - lprocfs_counter_add(ll_i2sbi(inode)->ll_stats, - LPROC_LL_BRW_WRITE, pg.count); + if (cmd & OBD_BRW_WRITE) + ll_stats_ops_tally(ll_i2sbi(inode), 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_i2obdexp(inode), oa, lsm, 1, &pg, NULL); + ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_BRW_READ, + pg.count); + oinfo.oi_oa = oa; + oinfo.oi_md = lsm; + /* NB partial write, so we might not have CAPA_OPC_OSS_READ capa */ + opc = cmd & OBD_BRW_WRITE ? CAPA_OPC_OSS_WRITE : CAPA_OPC_OSS_RW; + oinfo.oi_capa = ll_osscapa_get(inode, opc); + rc = obd_brw(cmd, ll_i2dtexp(inode), &oinfo, 1, &pg, NULL); + capa_put(oinfo.oi_capa); if (rc == 0) obdo_to_inode(inode, oa, OBD_MD_FLBLOCKS); else if (rc != -EIO) @@ -99,85 +111,148 @@ static int ll_brw(int cmd, struct inode *inode, struct obdo *oa, } /* 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. */ + * 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 lov_stripe_md *lsm = ll_i2info(inode)->lli_smd; + struct ll_inode_info *lli = ll_i2info(inode); + struct obd_info oinfo = { { { 0 } } }; + struct ost_lvb lvb; struct obdo oa; int rc; ENTRY; - CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p)\n", inode->i_ino, - inode->i_generation, inode); + CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p) to %Lu=%#Lx\n",inode->i_ino, + inode->i_generation, inode, i_size_read(inode), + i_size_read(inode)); - if (!lsm) { - CDEBUG(D_INODE, "truncate on inode %lu with no objects\n", - inode->i_ino); + ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_TRUNC, 1); + if (lli->lli_size_sem_owner != current) { EXIT; return; } - oa.o_id = lsm->lsm_object_id; - oa.o_valid = OBD_MD_FLID; - obdo_from_inode(&oa, inode, OBD_MD_FLTYPE|OBD_MD_FLMODE|OBD_MD_FLATIME| - OBD_MD_FLMTIME | OBD_MD_FLCTIME); + if (!lli->lli_smd) { + CDEBUG(D_INODE, "truncate on inode %lu with no objects\n", + inode->i_ino); + GOTO(out_unlock, 0); + } + + LASSERT(atomic_read(&lli->lli_size_sem.count) <= 0); + + /* XXX I'm pretty sure this is a hack to paper over a more fundamental + * race condition. */ + lov_stripe_lock(lli->lli_smd); + inode_init_lvb(inode, &lvb); + obd_merge_lvb(ll_i2dtexp(inode), lli->lli_smd, &lvb, 0); + if (lvb.lvb_size == i_size_read(inode)) { + CDEBUG(D_VFSTRACE, "skipping punch for obj "LPX64", %Lu=%#Lx\n", + lli->lli_smd->lsm_object_id, i_size_read(inode), + i_size_read(inode)); + lov_stripe_unlock(lli->lli_smd); + GOTO(out_unlock, 0); + } + + obd_adjust_kms(ll_i2dtexp(inode), lli->lli_smd, i_size_read(inode), 1); + lov_stripe_unlock(lli->lli_smd); + + if (unlikely((ll_i2sbi(inode)->ll_flags & LL_SBI_CHECKSUM) && + (i_size_read(inode) & ~CFS_PAGE_MASK))) { + /* If the truncate leaves behind a partial page, update its + * checksum. */ + struct page *page = find_get_page(inode->i_mapping, + i_size_read(inode) >> + CFS_PAGE_SHIFT); + if (page != NULL) { + struct ll_async_page *llap = llap_cast_private(page); + if (llap != NULL) { + llap->llap_checksum = + crc32_le(0, kmap(page), CFS_PAGE_SIZE); + kunmap(page); + } + page_cache_release(page); + } + } + + CDEBUG(D_INFO, "calling punch for "LPX64" (new size %Lu=%#Lx)\n", + lli->lli_smd->lsm_object_id, i_size_read(inode), i_size_read(inode)); - CDEBUG(D_INFO, "calling punch for "LPX64" (all bytes after %Lu)\n", - oa.o_id, inode->i_size); + oinfo.oi_md = lli->lli_smd; + oinfo.oi_policy.l_extent.start = i_size_read(inode); + oinfo.oi_policy.l_extent.end = OBD_OBJECT_EOF; + oinfo.oi_oa = &oa; + oa.o_id = lli->lli_smd->lsm_object_id; + oa.o_gr = lli->lli_smd->lsm_object_gr; + oa.o_valid = OBD_MD_FLID | OBD_MD_FLGROUP; - /* truncate == punch from new size to absolute end of file */ - /* NB: obd_punch must be called with i_sem held! It updates the kms! */ - rc = obd_punch(ll_i2obdexp(inode), &oa, lsm, inode->i_size, - OBD_OBJECT_EOF, NULL); + obdo_from_inode(&oa, inode, OBD_MD_FLTYPE | OBD_MD_FLMODE | + OBD_MD_FLATIME | OBD_MD_FLMTIME | OBD_MD_FLCTIME | + OBD_MD_FLFID | OBD_MD_FLGENER); + + ll_inode_size_unlock(inode, 0); + + oinfo.oi_capa = ll_osscapa_get(inode, CAPA_OPC_OSS_TRUNC); + rc = obd_punch_rqset(ll_i2dtexp(inode), &oinfo, NULL); + ll_truncate_free_capa(oinfo.oi_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); - + OBD_MD_FLATIME | OBD_MD_FLMTIME | OBD_MD_FLCTIME); EXIT; return; + + out_unlock: + ll_inode_size_unlock(inode, 0); } /* ll_truncate */ -__u64 lov_merge_size(struct lov_stripe_md *lsm, int kms); int ll_prepare_write(struct file *file, struct page *page, 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; + obd_off offset = ((obd_off)page->index) << CFS_PAGE_SHIFT; + struct obd_info oinfo = { { { 0 } } }; struct brw_page pga; struct obdo oa; - __u64 kms; + struct ost_lvb lvb; int rc = 0; ENTRY; - if (!PageLocked(page)) - LBUG(); + LASSERT(PageLocked(page)); + (void)llap_cast_private(page); /* assertion */ /* Check to see if we should return -EIO right away */ pga.pg = page; pga.off = offset; - pga.count = PAGE_SIZE; + pga.count = CFS_PAGE_SIZE; pga.flag = 0; - oa.o_id = lsm->lsm_object_id; oa.o_mode = inode->i_mode; - oa.o_valid = OBD_MD_FLID | OBD_MD_FLMODE | OBD_MD_FLTYPE; - - rc = obd_brw(OBD_BRW_CHECK, ll_i2obdexp(inode), &oa, lsm, 1, &pga, - NULL); + oa.o_id = lsm->lsm_object_id; + oa.o_gr = lsm->lsm_object_gr; + oa.o_valid = OBD_MD_FLID | OBD_MD_FLMODE | + OBD_MD_FLTYPE | OBD_MD_FLGROUP; + obdo_from_inode(&oa, inode, OBD_MD_FLFID | OBD_MD_FLGENER); + + oinfo.oi_oa = &oa; + oinfo.oi_md = lsm; + rc = obd_brw(OBD_BRW_CHECK, ll_i2dtexp(inode), &oinfo, 1, &pga, NULL); if (rc) RETURN(rc); - if (PageUptodate(page)) + if (PageUptodate(page)) { + LL_CDEBUG_PAGE(D_PAGE, page, "uptodate\n"); RETURN(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) { + if (from == 0 && to == CFS_PAGE_SIZE) { + LL_CDEBUG_PAGE(D_PAGE, page, "full page write\n"); POISON_PAGE(page, 0x11); RETURN(0); } @@ -185,9 +260,14 @@ int ll_prepare_write(struct file *file, struct page *page, unsigned from, /* 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. */ - kms = lov_merge_size(lsm, 1); - if (kms <= offset) { - memset(kmap(page), 0, PAGE_SIZE); + lov_stripe_lock(lsm); + inode_init_lvb(inode, &lvb); + obd_merge_lvb(ll_i2dtexp(inode), lsm, &lvb, 1); + lov_stripe_unlock(lsm); + if (lvb.lvb_size <= offset) { + LL_CDEBUG_PAGE(D_PAGE, page, "kms "LPU64" <= offset "LPU64"\n", + lvb.lvb_size, offset); + memset(kmap(page), 0, CFS_PAGE_SIZE); kunmap(page); GOTO(prepare_done, rc = 0); } @@ -208,34 +288,23 @@ int ll_prepare_write(struct file *file, struct page *page, unsigned from, return rc; } -struct ll_async_page *llap_from_cookie(void *cookie) -{ - struct ll_async_page *llap = cookie; - if (llap->llap_magic != LLAP_MAGIC) - return ERR_PTR(-EINVAL); - return llap; -}; - static int ll_ap_make_ready(void *data, int cmd) { struct ll_async_page *llap; struct page *page; ENTRY; - llap = llap_from_cookie(data); - if (IS_ERR(llap)) - RETURN(-EINVAL); - + llap = LLAP_FROM_COOKIE(data); page = llap->llap_page; - LASSERT(cmd != OBD_BRW_READ); + LASSERTF(!(cmd & OBD_BRW_READ), "cmd %x page %p ino %lu index %lu\n", cmd, page, + page->mapping->host->i_ino, page->index); /* we're trying to write, but the page is locked.. come back later */ if (TryLockPage(page)) RETURN(-EAGAIN); - LL_CDEBUG_PAGE(D_PAGE, page, "made ready\n"); - page_cache_get(page); + LASSERT(!PageWriteback(page)); /* if we left PageDirty we might get another writepage call * in the future. list walkers are bright enough @@ -244,19 +313,29 @@ static int ll_ap_make_ready(void *data, int cmd) * 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); + LASSERTF(!PageWriteback(page),"cmd %x page %p ino %lu index %lu\n", cmd, page, + page->mapping->host->i_ino, page->index); + clear_page_dirty_for_io(page); + + /* This actually clears the dirty bit in the radix tree.*/ + set_page_writeback(page); + + LL_CDEBUG_PAGE(D_PAGE, page, "made ready\n"); + page_cache_get(page); + RETURN(0); } -/* We have two reasons for giving llite the opportunity to change the +/* 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: + * 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. + * 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 + * write RPCs that are just going to be thrown away by the * truncate's punch on the storage targets. * * The kms serves these purposes as it is set at both truncate and extending @@ -264,32 +343,39 @@ static int ll_ap_make_ready(void *data, int cmd) */ static int ll_ap_refresh_count(void *data, int cmd) { + struct ll_inode_info *lli; struct ll_async_page *llap; struct lov_stripe_md *lsm; struct page *page; + struct inode *inode; + struct ost_lvb lvb; __u64 kms; ENTRY; /* readpage queues with _COUNT_STABLE, shouldn't get here. */ LASSERT(cmd != OBD_BRW_READ); - llap = llap_from_cookie(data); - if (IS_ERR(llap)) - RETURN(PTR_ERR(llap)); - + llap = LLAP_FROM_COOKIE(data); page = llap->llap_page; - lsm = ll_i2info(page->mapping->host)->lli_smd; - kms = lov_merge_size(lsm, 1); + inode = page->mapping->host; + lli = ll_i2info(inode); + lsm = lli->lli_smd; + + lov_stripe_lock(lsm); + inode_init_lvb(inode, &lvb); + obd_merge_lvb(ll_i2dtexp(inode), lsm, &lvb, 1); + kms = lvb.lvb_size; + lov_stripe_unlock(lsm); /* catch race with truncate */ - if (((__u64)page->index << PAGE_SHIFT) >= kms) + if (((__u64)page->index << CFS_PAGE_SHIFT) >= kms) return 0; /* catch sub-page write at end of file */ - if (((__u64)page->index << PAGE_SHIFT) + PAGE_SIZE > kms) - return kms % PAGE_SIZE; + if (((__u64)page->index << CFS_PAGE_SHIFT) + CFS_PAGE_SIZE > kms) + return kms % CFS_PAGE_SIZE; - return PAGE_SIZE; + return CFS_PAGE_SIZE; } void ll_inode_fill_obdo(struct inode *inode, int cmd, struct obdo *oa) @@ -300,14 +386,16 @@ void ll_inode_fill_obdo(struct inode *inode, int cmd, struct obdo *oa) lsm = ll_i2info(inode)->lli_smd; oa->o_id = lsm->lsm_object_id; - oa->o_valid = OBD_MD_FLID; + 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) { - oa->o_valid |= OBD_MD_FLIFID | OBD_MD_FLEPOCH; - mdc_pack_fid(obdo_fid(oa), inode->i_ino, 0, inode->i_mode); - oa->o_easize = ll_i2info(inode)->lli_io_epoch; + if (cmd & OBD_BRW_WRITE) { + oa->o_valid |= OBD_MD_FLEPOCH; + oa->o_easize = ll_i2info(inode)->lli_ioepoch; - valid_flags |= OBD_MD_FLMTIME | OBD_MD_FLCTIME; + valid_flags |= OBD_MD_FLMTIME | OBD_MD_FLCTIME | + OBD_MD_FLUID | OBD_MD_FLGID | + OBD_MD_FLFID | OBD_MD_FLGENER; } obdo_from_inode(oa, inode, valid_flags); @@ -318,72 +406,355 @@ static void ll_ap_fill_obdo(void *data, int cmd, struct obdo *oa) struct ll_async_page *llap; ENTRY; - llap = llap_from_cookie(data); - if (IS_ERR(llap)) { - EXIT; - return; - } - + llap = LLAP_FROM_COOKIE(data); ll_inode_fill_obdo(llap->llap_page->mapping->host, cmd, oa); + + EXIT; +} + +static void ll_ap_update_obdo(void *data, int cmd, struct obdo *oa, + obd_valid valid) +{ + struct ll_async_page *llap; + ENTRY; + + llap = LLAP_FROM_COOKIE(data); + obdo_from_inode(oa, llap->llap_page->mapping->host, valid); + EXIT; } +static struct obd_capa *ll_ap_lookup_capa(void *data, int cmd) +{ + struct ll_async_page *llap = LLAP_FROM_COOKIE(data); + int opc = cmd & OBD_BRW_WRITE ? CAPA_OPC_OSS_WRITE : CAPA_OPC_OSS_RW; + + return ll_osscapa_get(llap->llap_page->mapping->host, opc); +} + 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_update_obdo = ll_ap_update_obdo, .ap_completion = ll_ap_completion, + .ap_lookup_capa = ll_ap_lookup_capa, }; -/* XXX have the exp be an argument? */ -struct ll_async_page *llap_from_page(struct page *page) +struct ll_async_page *llap_cast_private(struct page *page) +{ + struct ll_async_page *llap = (struct ll_async_page *)page_private(page); + + LASSERTF(llap == NULL || llap->llap_magic == LLAP_MAGIC, + "page %p private %lu gave magic %d which != %d\n", + page, page_private(page), llap->llap_magic, LLAP_MAGIC); + + return llap; +} + +/* Try to shrink the page cache for the @sbi filesystem by 1/@shrink_fraction. + * + * There is an llap attached onto every page in lustre, linked off @sbi. + * We add an llap to the list so we don't lose our place during list walking. + * If llaps in the list are being moved they will only move to the end + * of the LRU, and we aren't terribly interested in those pages here (we + * start at the beginning of the list where the least-used llaps are. + */ +int llap_shrink_cache(struct ll_sb_info *sbi, int shrink_fraction) +{ + struct ll_async_page *llap, dummy_llap = { .llap_magic = 0xd11ad11a }; + unsigned long total, want, count = 0; + + total = sbi->ll_async_page_count; + + /* There can be a large number of llaps (600k or more in a large + * memory machine) so the VM 1/6 shrink ratio is likely too much. + * Since we are freeing pages also, we don't necessarily want to + * shrink so much. Limit to 40MB of pages + llaps per call. */ + if (shrink_fraction == 0) + want = sbi->ll_async_page_count - sbi->ll_async_page_max + 32; + else + want = (total + shrink_fraction - 1) / shrink_fraction; + + if (want > 40 << (20 - CFS_PAGE_SHIFT)) + want = 40 << (20 - CFS_PAGE_SHIFT); + + CDEBUG(D_CACHE, "shrinking %lu of %lu pages (1/%d)\n", + want, total, shrink_fraction); + + spin_lock(&sbi->ll_lock); + list_add(&dummy_llap.llap_pglist_item, &sbi->ll_pglist); + + while (--total >= 0 && count < want) { + struct page *page; + int keep; + + if (unlikely(need_resched())) { + spin_unlock(&sbi->ll_lock); + cond_resched(); + spin_lock(&sbi->ll_lock); + } + + llap = llite_pglist_next_llap(sbi,&dummy_llap.llap_pglist_item); + list_del_init(&dummy_llap.llap_pglist_item); + if (llap == NULL) + break; + + page = llap->llap_page; + LASSERT(page != NULL); + + list_add(&dummy_llap.llap_pglist_item, &llap->llap_pglist_item); + + /* Page needs/undergoing IO */ + if (TryLockPage(page)) { + LL_CDEBUG_PAGE(D_PAGE, page, "can't lock\n"); + continue; + } + + keep = (llap->llap_write_queued || PageDirty(page) || + PageWriteback(page) || (!PageUptodate(page) && + llap->llap_origin != LLAP_ORIGIN_READAHEAD)); + + LL_CDEBUG_PAGE(D_PAGE, page,"%s LRU page: %s%s%s%s%s origin %s\n", + keep ? "keep" : "drop", + llap->llap_write_queued ? "wq " : "", + PageDirty(page) ? "pd " : "", + PageUptodate(page) ? "" : "!pu ", + PageWriteback(page) ? "wb" : "", + llap->llap_defer_uptodate ? "" : "!du", + llap_origins[llap->llap_origin]); + + /* If page is dirty or undergoing IO don't discard it */ + if (keep) { + unlock_page(page); + continue; + } + + page_cache_get(page); + spin_unlock(&sbi->ll_lock); + + if (page->mapping != NULL) { + ll_teardown_mmaps(page->mapping, + (__u64)page->index << CFS_PAGE_SHIFT, + ((__u64)page->index << CFS_PAGE_SHIFT)| + ~CFS_PAGE_MASK); + if (!PageDirty(page) && !page_mapped(page)) { + ll_ra_accounting(llap, page->mapping); + ll_truncate_complete_page(page); + ++count; + } else { + LL_CDEBUG_PAGE(D_PAGE, page, "Not dropping page" + " because it is " + "%s\n", + PageDirty(page)? + "dirty":"mapped"); + } + } + unlock_page(page); + page_cache_release(page); + + spin_lock(&sbi->ll_lock); + } + list_del(&dummy_llap.llap_pglist_item); + spin_unlock(&sbi->ll_lock); + + CDEBUG(D_CACHE, "shrank %lu/%lu and left %lu unscanned\n", + count, want, total); + + return count; +} + +struct ll_async_page *llap_from_page(struct page *page, unsigned origin) { struct ll_async_page *llap; struct obd_export *exp; struct inode *inode = page->mapping->host; - struct ll_sb_info *sbi = ll_i2sbi(inode); + struct ll_sb_info *sbi; int rc; ENTRY; - llap = (struct ll_async_page *)page->private; + if (!inode) { + static int triggered; + + if (!triggered) { + LL_CDEBUG_PAGE(D_ERROR, page, "Bug 10047. Wrong anon " + "page received\n"); + libcfs_debug_dumpstack(NULL); + triggered = 1; + } + RETURN(ERR_PTR(-EINVAL)); + } + sbi = ll_i2sbi(inode); + LASSERT(ll_async_page_slab); + LASSERTF(origin < LLAP__ORIGIN_MAX, "%u\n", origin); + + llap = llap_cast_private(page); if (llap != NULL) { - if (llap->llap_magic != LLAP_MAGIC) - RETURN(ERR_PTR(-EINVAL)); - RETURN(llap); + /* move to end of LRU list, except when page is just about to + * die */ + if (origin != LLAP_ORIGIN_REMOVEPAGE) { + spin_lock(&sbi->ll_lock); + sbi->ll_pglist_gen++; + list_del_init(&llap->llap_pglist_item); + list_add_tail(&llap->llap_pglist_item, &sbi->ll_pglist); + spin_unlock(&sbi->ll_lock); + } + GOTO(out, llap); } - exp = ll_i2obdexp(page->mapping->host); + exp = ll_i2dtexp(page->mapping->host); if (exp == NULL) RETURN(ERR_PTR(-EINVAL)); - OBD_ALLOC(llap, sizeof(*llap)); + /* limit the number of lustre-cached pages */ + if (sbi->ll_async_page_count >= sbi->ll_async_page_max) + llap_shrink_cache(sbi, 0); + + OBD_SLAB_ALLOC(llap, ll_async_page_slab, CFS_ALLOC_STD, + ll_async_page_slab_size); if (llap == NULL) RETURN(ERR_PTR(-ENOMEM)); llap->llap_magic = LLAP_MAGIC; + llap->llap_cookie = (void *)llap + size_round(sizeof(*llap)); + rc = obd_prep_async_page(exp, ll_i2info(inode)->lli_smd, NULL, page, - (obd_off)page->index << PAGE_SHIFT, + (obd_off)page->index << CFS_PAGE_SHIFT, &ll_async_page_ops, llap, &llap->llap_cookie); if (rc) { - OBD_FREE(llap, sizeof(*llap)); + OBD_SLAB_FREE(llap, ll_async_page_slab, + ll_async_page_slab_size); RETURN(ERR_PTR(rc)); } CDEBUG(D_CACHE, "llap %p page %p cookie %p obj off "LPU64"\n", llap, - page, llap->llap_cookie, (obd_off)page->index << PAGE_SHIFT); + page, llap->llap_cookie, (obd_off)page->index << CFS_PAGE_SHIFT); /* also zeroing the PRIVBITS low order bitflags */ - page->private = (unsigned long)llap; + __set_page_ll_data(page, llap); llap->llap_page = page; - spin_lock(&sbi->ll_lock); sbi->ll_pglist_gen++; - list_add_tail(&llap->llap_proc_item, &sbi->ll_pglist); + sbi->ll_async_page_count++; + list_add_tail(&llap->llap_pglist_item, &sbi->ll_pglist); + INIT_LIST_HEAD(&llap->llap_pending_write); spin_unlock(&sbi->ll_lock); + out: + if (unlikely(sbi->ll_flags & LL_SBI_CHECKSUM)) { + __u32 csum = 0; + csum = crc32_le(csum, kmap(page), CFS_PAGE_SIZE); + kunmap(page); + if (origin == LLAP_ORIGIN_READAHEAD || + origin == LLAP_ORIGIN_READPAGE) { + llap->llap_checksum = 0; + } else if (origin == LLAP_ORIGIN_COMMIT_WRITE || + llap->llap_checksum == 0) { + llap->llap_checksum = csum; + CDEBUG(D_PAGE, "page %p cksum %x\n", page, csum); + } else if (llap->llap_checksum == csum) { + /* origin == LLAP_ORIGIN_WRITEPAGE */ + CDEBUG(D_PAGE, "page %p cksum %x confirmed\n", + page, csum); + } else { + /* origin == LLAP_ORIGIN_WRITEPAGE */ + LL_CDEBUG_PAGE(D_ERROR, page, "old cksum %x != new " + "%x!\n", llap->llap_checksum, csum); + } + } + + llap->llap_origin = origin; RETURN(llap); } -void lov_increase_kms(struct obd_export *exp, struct lov_stripe_md *lsm, - obd_off size); +static int queue_or_sync_write(struct obd_export *exp, struct inode *inode, + struct ll_async_page *llap, + unsigned to, obd_flag async_flags) +{ + unsigned long size_index = i_size_read(inode) >> CFS_PAGE_SHIFT; + struct obd_io_group *oig; + struct ll_sb_info *sbi = ll_i2sbi(inode); + int rc, noquot = llap->llap_ignore_quota ? OBD_BRW_NOQUOTA : 0; + ENTRY; + + /* _make_ready only sees llap once we've unlocked the page */ + llap->llap_write_queued = 1; + rc = obd_queue_async_io(exp, ll_i2info(inode)->lli_smd, NULL, + llap->llap_cookie, OBD_BRW_WRITE | noquot, + 0, 0, 0, async_flags); + if (rc == 0) { + LL_CDEBUG_PAGE(D_PAGE, llap->llap_page, "write queued\n"); + GOTO(out, 0); + } + + llap->llap_write_queued = 0; + /* Do not pass llap here as it is sync write. */ + llap_write_pending(inode, NULL); + + rc = oig_init(&oig); + if (rc) + GOTO(out, rc); + + /* make full-page requests if we are not at EOF (bug 4410) */ + if (to != CFS_PAGE_SIZE && llap->llap_page->index < size_index) { + LL_CDEBUG_PAGE(D_PAGE, llap->llap_page, + "sync write before EOF: size_index %lu, to %d\n", + size_index, to); + to = CFS_PAGE_SIZE; + } else if (to != CFS_PAGE_SIZE && llap->llap_page->index == size_index) { + int size_to = i_size_read(inode) & ~CFS_PAGE_MASK; + LL_CDEBUG_PAGE(D_PAGE, llap->llap_page, + "sync write at EOF: size_index %lu, to %d/%d\n", + size_index, to, size_to); + if (to < size_to) + to = size_to; + } + + /* compare the checksum once before the page leaves llite */ + if (unlikely((sbi->ll_flags & LL_SBI_CHECKSUM) && + llap->llap_checksum != 0)) { + __u32 csum = 0; + struct page *page = llap->llap_page; + csum = crc32_le(csum, kmap(page), CFS_PAGE_SIZE); + kunmap(page); + if (llap->llap_checksum == csum) { + CDEBUG(D_PAGE, "page %p cksum %x confirmed\n", + page, csum); + } else { + CERROR("page %p old cksum %x != new cksum %x!\n", + page, llap->llap_checksum, csum); + } + } + + rc = obd_queue_group_io(exp, ll_i2info(inode)->lli_smd, NULL, oig, + llap->llap_cookie, OBD_BRW_WRITE | noquot, + 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, ll_i2info(inode)->lli_smd, NULL, oig); + if (rc) + GOTO(free_oig, rc); + + rc = oig_wait(oig); + + if (!rc && async_flags & ASYNC_READY) { + unlock_page(llap->llap_page); + if (PageWriteback(llap->llap_page)) { + end_page_writeback(llap->llap_page); + } + } + + if (rc == 0 && llap_write_complete(inode, llap)) + ll_queue_done_writing(inode, 0); + + LL_CDEBUG_PAGE(D_PAGE, llap->llap_page, "sync write returned %d\n", rc); + +free_oig: + oig_release(oig); +out: + RETURN(rc); +} + /* update our write count to account for i_size increases that may have * happened since we've queued the page for io. */ @@ -395,7 +766,7 @@ int ll_commit_write(struct file *file, struct page *page, unsigned from, 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 obd_export *exp; struct ll_async_page *llap; loff_t size; int rc = 0; @@ -408,81 +779,81 @@ int ll_commit_write(struct file *file, struct page *page, unsigned from, CDEBUG(D_INODE, "inode %p is writing page %p from %d to %d at %lu\n", inode, page, from, to, page->index); - llap = llap_from_page(page); + llap = llap_from_page(page, LLAP_ORIGIN_COMMIT_WRITE); if (IS_ERR(llap)) RETURN(PTR_ERR(llap)); - /* 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); - - exp = ll_i2obdexp(inode); - if (exp == NULL) - RETURN(-EINVAL); - - /* _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, 0); - if (rc != 0) { /* async failed, try sync.. */ - struct obd_io_group *oig; - rc = oig_init(&oig); - if (rc) - GOTO(out, rc); - - llap->llap_write_queued = 0; - 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); + exp = ll_i2dtexp(inode); + if (exp == NULL) + RETURN(-EINVAL); - rc = obd_trigger_group_io(exp, lsm, NULL, oig); - if (rc) - GOTO(free_oig, rc); + llap->llap_ignore_quota = capable(CAP_SYS_RESOURCE); + + /* + * queue a write for some time in the future the first time we + * dirty the page. + * + * This is different from what other file systems do: they usually + * just mark page (and some of its buffers) dirty and rely on + * balance_dirty_pages() to start a write-back. Lustre wants write-back + * to be started earlier for the following reasons: + * + * (1) with a large number of clients we need to limit the amount + * of cached data on the clients a lot; + * + * (2) large compute jobs generally want compute-only then io-only + * and the IO should complete as quickly as possible; + * + * (3) IO is batched up to the RPC size and is async until the + * client max cache is hit + * (/proc/fs/lustre/osc/OSC.../max_dirty_mb) + * + */ + if (!PageDirty(page)) { + ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_DIRTY_MISSES, 1); - rc = oig_wait(oig); -free_oig: - oig_release(oig); + rc = queue_or_sync_write(exp, inode, llap, to, 0); + if (rc) GOTO(out, rc); - } - LL_CDEBUG_PAGE(D_PAGE, page, "write queued\n"); - //llap_write_pending(inode, llap); } else { - lprocfs_counter_incr(ll_i2sbi(inode)->ll_stats, - LPROC_LL_DIRTY_HITS); + ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_DIRTY_HITS, 1); } /* put the page in the page cache, from now on ll_removepage is - * responsible for cleaning up the llap */ - set_page_dirty(page); + * responsible for cleaning up the llap. + * only set page dirty when it's queued to be write out */ + if (llap->llap_write_queued) + set_page_dirty(page); out: + size = (((obd_off)page->index) << CFS_PAGE_SHIFT) + to; + ll_inode_size_lock(inode, 0); if (rc == 0) { - size = (((obd_off)page->index) << PAGE_SHIFT) + to; - lov_increase_kms(exp, lsm, size); - if (size > inode->i_size) - inode->i_size = size; + lov_stripe_lock(lsm); + obd_adjust_kms(exp, lsm, size, 0); + lov_stripe_unlock(lsm); + if (size > i_size_read(inode)) + i_size_write(inode, size); SetPageUptodate(page); + } else if (size > i_size_read(inode)) { + /* 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); } + ll_inode_size_unlock(inode, 0); RETURN(rc); } static unsigned long ll_ra_count_get(struct ll_sb_info *sbi, unsigned long len) { + struct ll_ra_info *ra = &sbi->ll_ra_info; unsigned long ret; ENTRY; spin_lock(&sbi->ll_lock); - ret = min(sbi->ll_max_read_ahead_pages - sbi->ll_read_ahead_pages, - len); - sbi->ll_read_ahead_pages += ret; + ret = min(ra->ra_max_pages - ra->ra_cur_pages, len); + ra->ra_cur_pages += ret; spin_unlock(&sbi->ll_lock); RETURN(ret); @@ -490,36 +861,34 @@ static unsigned long ll_ra_count_get(struct ll_sb_info *sbi, unsigned long len) static void ll_ra_count_put(struct ll_sb_info *sbi, unsigned long len) { + struct ll_ra_info *ra = &sbi->ll_ra_info; spin_lock(&sbi->ll_lock); - LASSERTF(sbi->ll_read_ahead_pages >= len, "r_a_p %lu len %lu\n", - sbi->ll_read_ahead_pages, len); - sbi->ll_read_ahead_pages -= len; + 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); } /* called for each page in a completed rpc.*/ -void ll_ap_completion(void *data, int cmd, struct obdo *oa, int rc) +int ll_ap_completion(void *data, int cmd, struct obdo *oa, int rc) { struct ll_async_page *llap; struct page *page; + int ret = 0; ENTRY; - llap = llap_from_cookie(data); - if (IS_ERR(llap)) { - EXIT; - return; - } - + llap = LLAP_FROM_COOKIE(data); page = llap->llap_page; LASSERT(PageLocked(page)); - + LASSERT(CheckWriteback(page,cmd)); + LL_CDEBUG_PAGE(D_PAGE, page, "completing cmd %d with %d\n", cmd, rc); - if (cmd == OBD_BRW_READ && llap->llap_defer_uptodate) + if (cmd & OBD_BRW_READ && llap->llap_defer_uptodate) ll_ra_count_put(ll_i2sbi(page->mapping->host), 1); if (rc == 0) { - if (cmd == OBD_BRW_READ) { + if (cmd & OBD_BRW_READ) { if (!llap->llap_defer_uptodate) SetPageUptodate(page); } else { @@ -527,20 +896,32 @@ void ll_ap_completion(void *data, int cmd, struct obdo *oa, int rc) } ClearPageError(page); } else { - if (cmd == OBD_BRW_READ) + if (cmd & OBD_BRW_READ) { llap->llap_defer_uptodate = 0; + } SetPageError(page); + if (rc == -ENOSPC) + set_bit(AS_ENOSPC, &page->mapping->flags); + else + set_bit(AS_EIO, &page->mapping->flags); } unlock_page(page); - if (0 && cmd == OBD_BRW_WRITE) { - llap_write_complete(page->mapping->host, llap); - ll_try_done_writing(page->mapping->host); + if (cmd & OBD_BRW_WRITE) { + /* Only rc == 0, write succeed, then this page could be deleted + * from the pending_writing list + */ + if (rc == 0 && llap_write_complete(page->mapping->host, llap)) + ll_queue_done_writing(page->mapping->host, 0); } + if (PageWriteback(page)) { + end_page_writeback(page); + } page_cache_release(page); - EXIT; + + RETURN(ret); } /* the kernel calls us here when a page is unhashed from the page cache. @@ -560,21 +941,21 @@ void ll_removepage(struct page *page) /* 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) { + if (page_private(page) == 0) { EXIT; return; } LL_CDEBUG_PAGE(D_PAGE, page, "being evicted\n"); - exp = ll_i2obdexp(inode); + 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); + llap = llap_from_page(page, LLAP_ORIGIN_REMOVEPAGE); if (IS_ERR(llap)) { CERROR("page %p ind %lu couldn't find llap: %ld\n", page, page->index, PTR_ERR(llap)); @@ -582,7 +963,9 @@ void ll_removepage(struct page *page) return; } - //llap_write_complete(inode, llap); + if (llap_write_complete(inode, llap)) + ll_queue_done_writing(inode, 0); + rc = obd_teardown_async_page(exp, ll_i2info(inode)->lli_smd, NULL, llap->llap_cookie); if (rc != 0) @@ -590,14 +973,15 @@ void ll_removepage(struct page *page) /* this unconditional free is only safe because the page lock * is providing exclusivity to memory pressure/truncate/writeback..*/ - page->private = 0; + __clear_page_ll_data(page); spin_lock(&sbi->ll_lock); - if (!list_empty(&llap->llap_proc_item)) - list_del_init(&llap->llap_proc_item); + if (!list_empty(&llap->llap_pglist_item)) + list_del_init(&llap->llap_pglist_item); sbi->ll_pglist_gen++; + sbi->ll_async_page_count--; spin_unlock(&sbi->ll_lock); - OBD_FREE(llap, sizeof(*llap)); + OBD_SLAB_FREE(llap, ll_async_page_slab, ll_async_page_slab_size); EXIT; } @@ -609,14 +993,16 @@ static int ll_page_matches(struct page *page, int fd_flags) int flags, matches; ENTRY; - if (fd_flags & LL_FILE_GROUP_LOCKED) + if (unlikely(fd_flags & LL_FILE_GROUP_LOCKED)) RETURN(1); - page_extent.l_extent.start = (__u64)page->index << PAGE_CACHE_SHIFT; + page_extent.l_extent.start = (__u64)page->index << CFS_PAGE_SHIFT; page_extent.l_extent.end = - page_extent.l_extent.start + PAGE_CACHE_SIZE - 1; - flags = LDLM_FL_CBPENDING | LDLM_FL_BLOCK_GRANTED | LDLM_FL_TEST_LOCK; - matches = obd_match(ll_i2sbi(inode)->ll_osc_exp, + page_extent.l_extent.start + CFS_PAGE_SIZE - 1; + flags = LDLM_FL_TEST_LOCK | LDLM_FL_BLOCK_GRANTED; + if (!(fd_flags & LL_FILE_READAHEAD)) + flags |= LDLM_FL_CBPENDING; + 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); @@ -632,10 +1018,11 @@ static int ll_issue_page_read(struct obd_export *exp, 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); + CFS_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); @@ -643,11 +1030,109 @@ static int ll_issue_page_read(struct obd_export *exp, RETURN(rc); } +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]++; +} + +static void ll_ra_stats_inc(struct address_space *mapping, enum ra_stat which) +{ + 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); +} + +void ll_ra_accounting(struct ll_async_page *llap, struct address_space *mapping) +{ + if (!llap->llap_defer_uptodate || llap->llap_ra_used) + return; + + ll_ra_stats_inc(mapping, RA_STAT_DISCARDED); +} + #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); + CDEBUG(D_READA, \ + "lrp %lu cr %lu cp %lu ws %lu wl %lu nra %lu r %lu ri %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); + +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; + + if (start > point) + start = 0; + if (end < point) + end = ~0; + + return start <= index && index <= end; +} + +static struct ll_readahead_state *ll_ras_get(struct file *f) +{ + struct ll_file_data *fd; + + fd = LUSTRE_FPRIVATE(f); + return &fd->fd_ras; +} + +void ll_ra_read_in(struct file *f, struct ll_ra_read *rar) +{ + struct ll_readahead_state *ras; + + ras = ll_ras_get(f); + + spin_lock(&ras->ras_lock); + ras->ras_requests++; + ras->ras_request_index = 0; + ras->ras_consecutive_requests++; + rar->lrr_reader = current; + + list_add(&rar->lrr_linkage, &ras->ras_read_beads); + spin_unlock(&ras->ras_lock); +} + +void ll_ra_read_ex(struct file *f, struct ll_ra_read *rar) +{ + struct ll_readahead_state *ras; + + ras = ll_ras_get(f); + + spin_lock(&ras->ras_lock); + list_del_init(&rar->lrr_linkage); + spin_unlock(&ras->ras_lock); +} + +static struct ll_ra_read *ll_ra_read_get_locked(struct ll_readahead_state *ras) +{ + struct ll_ra_read *scan; + + list_for_each_entry(scan, &ras->ras_read_beads, lrr_linkage) { + if (scan->lrr_reader == current) + return scan; + } + return NULL; +} + +struct ll_ra_read *ll_ra_read_get(struct file *f) +{ + struct ll_readahead_state *ras; + struct ll_ra_read *bead; + + ras = ll_ras_get(f); + + spin_lock(&ras->ras_lock); + bead = ll_ra_read_get_locked(ras); + spin_unlock(&ras->ras_lock); + return bead; +} static int ll_readahead(struct ll_readahead_state *ras, struct obd_export *exp, struct address_space *mapping, @@ -656,43 +1141,82 @@ static int ll_readahead(struct ll_readahead_state *ras, unsigned long i, start = 0, end = 0, reserved; struct ll_async_page *llap; struct page *page; - int rc, ret = 0; + int rc, ret = 0, match_failed = 0; __u64 kms; + unsigned int gfp_mask; + struct inode *inode; + struct lov_stripe_md *lsm; + struct ll_ra_read *bead; + struct ost_lvb lvb; ENTRY; - kms = lov_merge_size(ll_i2info(mapping->host)->lli_smd, 1); - if (kms == 0) + inode = mapping->host; + lsm = ll_i2info(inode)->lli_smd; + + lov_stripe_lock(lsm); + inode_init_lvb(inode, &lvb); + obd_merge_lvb(ll_i2dtexp(inode), lsm, &lvb, 1); + kms = lvb.lvb_size; + lov_stripe_unlock(lsm); + if (kms == 0) { + ll_ra_stats_inc(mapping, RA_STAT_ZERO_LEN); RETURN(0); + } spin_lock(&ras->ras_lock); - + bead = ll_ra_read_get_locked(ras); + /* 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)); + } + if (end != 0) { + /* 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); - if (end == 0) + if (end == 0) { + ll_ra_stats_inc(mapping, RA_STAT_ZERO_WINDOW); RETURN(0); + } - reserved = ll_ra_count_get(ll_i2sbi(mapping->host), end - start + 1); + reserved = ll_ra_count_get(ll_i2sbi(inode), end - start + 1); + if (reserved < end - start + 1) + ll_ra_stats_inc(mapping, RA_STAT_MAX_IN_FLIGHT); - for (i = start; reserved > 0 && i <= end; i++) { + gfp_mask = GFP_HIGHUSER & ~__GFP_WAIT; +#ifdef __GFP_NOWARN + gfp_mask |= __GFP_NOWARN; +#endif + + for (i = start; reserved > 0 && !match_failed && i <= end; i++) { /* skip locked pages from previous readpage calls */ - page = grab_cache_page_nowait(mapping, i); + page = grab_cache_page_nowait_gfp(mapping, i, gfp_mask); if (page == NULL) { + ll_ra_stats_inc(mapping, RA_STAT_FAILED_GRAB_PAGE); CDEBUG(D_READA, "g_c_p_n failed\n"); continue; } - + + /* Check if page was truncated or reclaimed */ + if (page->mapping != mapping) { + ll_ra_stats_inc(mapping, RA_STAT_WRONG_GRAB_PAGE); + CDEBUG(D_READA, "g_c_p_n returned invalid page\n"); + goto next_page; + } + /* we do this first so that we can see the page in the /proc * accounting */ - llap = llap_from_page(page); + llap = llap_from_page(page, LLAP_ORIGIN_READAHEAD); if (IS_ERR(llap) || llap->llap_defer_uptodate) goto next_page; @@ -701,10 +1225,11 @@ static int ll_readahead(struct ll_readahead_state *ras, goto next_page; /* bail when we hit the end of the lock. */ - if ((rc = ll_page_matches(page, flags)) <= 0) { + if ((rc = ll_page_matches(page, flags|LL_FILE_READAHEAD)) <= 0){ LL_CDEBUG_PAGE(D_READA | D_PAGE, page, "lock match failed: rc %d\n", rc); - i = end; + ll_ra_stats_inc(mapping, RA_STAT_FAILED_MATCH); + match_failed = 1; goto next_page; } @@ -712,12 +1237,11 @@ static int ll_readahead(struct ll_readahead_state *ras, if (rc == 0) { reserved--; ret++; - LL_CDEBUG_PAGE(D_READA| D_PAGE, page, + LL_CDEBUG_PAGE(D_READA| D_PAGE, page, "started read-ahead\n"); - } - if (rc) { + } else { next_page: - LL_CDEBUG_PAGE(D_READA | D_PAGE, page, + LL_CDEBUG_PAGE(D_READA | D_PAGE, page, "skipping read-ahead\n"); unlock_page(page); @@ -727,27 +1251,43 @@ static int ll_readahead(struct ll_readahead_state *ras, 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 >> 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 + * the ras we need to go back and update the ras so that the + * 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, + ras->ras_window_len)) { + ras->ras_next_readahead = i; + RAS_CDEBUG(ras); + } + spin_unlock(&ras->ras_lock); + } + RETURN(ret); } -static void ras_set_start(struct ll_readahead_state *ras, - unsigned long index) +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_next_readahead = max(ras->ras_window_start, - ras->ras_next_readahead); + ras->ras_window_start = index & (~((1024 * 1024 >> CFS_PAGE_SHIFT) - 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) +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); } @@ -756,44 +1296,152 @@ void ll_readahead_init(struct inode *inode, struct ll_readahead_state *ras) { spin_lock_init(&ras->ras_lock); ras_reset(ras, 0); + ras->ras_requests = 0; + INIT_LIST_HEAD(&ras->ras_read_beads); } -static void ras_update(struct ll_readahead_state *ras, - unsigned long index, unsigned long max) +static 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; ENTRY; + spin_lock(&sbi->ll_lock); spin_lock(&ras->ras_lock); - if (index != ras->ras_last_readpage + 1) { + ll_ra_stats_inc_unlocked(ra, 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 + * read-ahead miss that we think we've previously issued. This can + * be a symptom of there being so many read-ahead pages that the VM is + * 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); + } 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); + } + + /* 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. 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); + + 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, + ra->ra_max_read_ahead_whole_pages); + GOTO(out_unlock, 0); + } + } + + if (zero) { ras_reset(ras, index); GOTO(out_unlock, 0); } ras->ras_last_readpage = index; - ras->ras_consecutive++; + ras->ras_consecutive_pages++; ras_set_start(ras, index); + ras->ras_next_readahead = max(ras->ras_window_start, + ras->ras_next_readahead); - if (ras->ras_consecutive == 2) { - ras->ras_window_len = PTLRPC_MAX_BRW_PAGES; + /* 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 == 3) { + ras->ras_window_len = 1024 * 1024 >> CFS_PAGE_SHIFT; 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, max); + /* 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 && !ras->ras_request_index) { + ras->ras_window_len = min(ras->ras_window_len + + (1024 * 1024 >> CFS_PAGE_SHIFT), + ra->ra_max_pages); } EXIT; out_unlock: RAS_CDEBUG(ras); + ras->ras_request_index++; spin_unlock(&ras->ras_lock); + spin_unlock(&sbi->ll_lock); return; } +int ll_writepage(struct page *page) +{ + struct inode *inode = page->mapping->host; + struct ll_inode_info *lli = ll_i2info(inode); + struct obd_export *exp; + struct ll_async_page *llap; + int rc = 0; + ENTRY; + + LASSERT(!PageDirty(page)); + LASSERT(PageLocked(page)); + + 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)); + + LASSERT(!PageWriteback(page)); + set_page_writeback(page); + + page_cache_get(page); + if (llap->llap_write_queued) { + LL_CDEBUG_PAGE(D_PAGE, page, "marking urgent\n"); + rc = obd_set_async_flags(exp, lli->lli_smd, NULL, + llap->llap_cookie, + ASYNC_READY | ASYNC_URGENT); + } else { + rc = queue_or_sync_write(exp, inode, llap, CFS_PAGE_SIZE, + ASYNC_READY | ASYNC_URGENT); + } + if (rc) + page_cache_release(page); +out: + if (rc) { + if (!lli->lli_async_rc) + lli->lli_async_rc = rc; + /* re-dirty page on error so it retries write */ + if (PageWriteback(page)) { + end_page_writeback(page); + } + /* resend page only for not started IO*/ + if (!PageError(page)) + ll_redirty_page(page); + unlock_page(page); + } + RETURN(rc); +} + /* * 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 @@ -805,7 +1453,7 @@ out_unlock: */ int ll_readpage(struct file *filp, struct page *page) { - struct ll_file_data *fd = filp->private_data; + struct ll_file_data *fd = LUSTRE_FPRIVATE(filp); struct inode *inode = page->mapping->host; struct obd_export *exp; struct ll_async_page *llap; @@ -815,32 +1463,46 @@ int ll_readpage(struct file *filp, struct page *page) LASSERT(PageLocked(page)); LASSERT(!PageUptodate(page)); - CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p),offset="LPX64"\n", + CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p),offset=%Lu=%#Lx\n", inode->i_ino, inode->i_generation, inode, - (((obd_off)page->index) << PAGE_SHIFT)); + (((loff_t)page->index) << CFS_PAGE_SHIFT), + (((loff_t)page->index) << CFS_PAGE_SHIFT)); LASSERT(atomic_read(&filp->f_dentry->d_inode->i_count) > 0); + if (!ll_i2info(inode)->lli_smd) { + /* File with no objects - one big hole */ + /* We use this just for remove_from_page_cache that is not + * exported, we'd make page back up to date. */ + ll_truncate_complete_page(page); + clear_page(kmap(page)); + kunmap(page); + SetPageUptodate(page); + unlock_page(page); + RETURN(0); + } + rc = oig_init(&oig); if (rc < 0) GOTO(out, rc); - exp = ll_i2obdexp(inode); + exp = ll_i2dtexp(inode); if (exp == NULL) GOTO(out, rc = -EINVAL); - llap = llap_from_page(page); + 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(&fd->fd_ras, page->index, - ll_i2sbi(inode)->ll_max_read_ahead_pages); + if (ll_i2sbi(inode)->ll_ra_info.ra_max_pages) + ras_update(ll_i2sbi(inode), 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, + 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); @@ -848,23 +1510,18 @@ int ll_readpage(struct file *filp, struct page *page) GOTO(out_oig, rc = 0); } - rc = ll_page_matches(page, fd->fd_flags); - if (rc < 0) { - LL_CDEBUG_PAGE(D_ERROR, page, "lock match failed: rc %d\n", rc); - GOTO(out, rc); - } + if (likely((fd->fd_flags & LL_FILE_IGNORE_LOCK) == 0)) { + rc = ll_page_matches(page, fd->fd_flags); + if (rc < 0) { + LL_CDEBUG_PAGE(D_ERROR, page, "lock match failed: rc %d\n", rc); + GOTO(out, rc); + } - if (rc == 0) { - static unsigned long next_print; - CDEBUG(D_INODE, "ino %lu page %lu (%llu) didn't match a lock\n", - inode->i_ino, page->index, - (long long)page->index << PAGE_CACHE_SHIFT); - if (time_after(jiffies, next_print)) { + 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); - next_print = jiffies + 30 * HZ; + "a lock (mmap?). check debug logs.\n", + inode->i_ino, page->index, + (long long)page->index << CFS_PAGE_SHIFT); } } @@ -873,7 +1530,7 @@ int ll_readpage(struct file *filp, struct page *page) GOTO(out, rc); LL_CDEBUG_PAGE(D_PAGE, page, "queued readpage\n"); - if (ll_i2sbi(inode)->ll_flags & LL_SBI_READAHEAD) + if (ll_i2sbi(inode)->ll_ra_info.ra_max_pages) ll_readahead(&fd->fd_ras, exp, page->mapping, oig, fd->fd_flags);