X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lustre%2Fllite%2Frw.c;h=017ec521df18134663fd5dc36bfec26ba256169a;hp=e5890bf19c89ce153d2da2d74eaca96034ce08de;hb=5900da4464d90468519964571c441382cd512232;hpb=bdd161755db65e1e7382ac4f22df9f574c1ed52c diff --git a/lustre/llite/rw.c b/lustre/llite/rw.c index e5890bf..017ec52 100644 --- a/lustre/llite/rw.c +++ b/lustre/llite/rw.c @@ -1,7 +1,7 @@ /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: * - * Lustre Lite I/O Page Cache + * Lustre Lite I/O page cache routines shared by different kernel revs * * Copyright (c) 2001-2003 Cluster File Systems, Inc. * @@ -21,7 +21,9 @@ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ +#ifndef AUTOCONF_INCLUDED #include +#endif #include #include #include @@ -34,13 +36,6 @@ #include #include -#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) -#include -#include -#include -#else -#include -#endif #include #include #include @@ -50,45 +45,19 @@ #define DEBUG_SUBSYSTEM S_LLITE -#include -#include +//#include +#include #include "llite_internal.h" #include -/* - * Remove page from dirty list - */ -static void __set_page_clean(struct page *page) -{ - struct address_space *mapping = page->mapping; - struct inode *inode; - - if (!mapping) - return; - - PGCACHE_WRLOCK(mapping); - - list_del(&page->list); - list_add(&page->list, &mapping->clean_pages); - - /* XXX doesn't inode_lock protect i_state ? */ - inode = mapping->host; - if (list_empty(&mapping->dirty_pages)) { - CDEBUG(D_INODE, "inode clean\n"); - inode->i_state &= ~I_DIRTY_PAGES; - } - - PGCACHE_WRUNLOCK(mapping); - EXIT; -} +#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 -void set_page_clean(struct page *page) -{ - if (PageDirty(page)) { - ClearPageDirty(page); - __set_page_clean(page); - } -} +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, @@ -96,334 +65,220 @@ static int ll_brw(int cmd, struct inode *inode, struct obdo *oa, { 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_i2obdconn(inode), oa, lsm, 1, &pg, NULL); - if (rc != 0 && rc != -EIO) + 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) CERROR("error from obd_brw: rc = %d\n", rc); - RETURN(rc); } -/* - * we were asked to read a single page but we're going to try and read a batch - * of pages all at once. this vaguely simulates 2.5's readpages. - */ -static int ll_readpage(struct file *file, struct page *first_page) +/* 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 inode *inode = first_page->mapping->host; struct ll_inode_info *lli = ll_i2info(inode); - struct page *page = first_page; - struct list_head *pos; - struct brw_page *pgs; - struct obdo *oa; - unsigned long end_index, extent_end = 0; - struct ptlrpc_request_set *set; - int npgs = 0, rc = 0, max_pages; + struct obd_info oinfo = { { { 0 } } }; + struct ost_lvb lvb; + struct obdo oa; + int rc; ENTRY; + 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)); - 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(&file->f_dentry->d_inode->i_count) > 0); - - if (inode->i_size <= ((obd_off)page->index) << PAGE_SHIFT) { - CERROR("reading beyond EOF\n"); - memset(kmap(page), 0, PAGE_SIZE); - kunmap(page); - SetPageUptodate(page); - unlock_page(page); - RETURN(rc); + ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_TRUNC, 1); + if (lli->lli_size_sem_owner != current) { + EXIT; + return; } - /* try to read the file's preferred block size in a one-er */ - end_index = first_page->index + - (inode->i_blksize >> PAGE_CACHE_SHIFT); - if (end_index > (inode->i_size >> PAGE_CACHE_SHIFT)) - end_index = inode->i_size >> PAGE_CACHE_SHIFT; - - max_pages = ((end_index - first_page->index) << PAGE_CACHE_SHIFT) >> - PAGE_SHIFT; - pgs = kmalloc(max_pages * sizeof(*pgs), GFP_USER); - if (pgs == NULL) - RETURN(-ENOMEM); - - /* - * find how far we're allowed to read under the extent ll_file_read - * is passing us.. - */ - spin_lock(&lli->lli_read_extent_lock); - list_for_each(pos, &lli->lli_read_extents) { - struct ll_read_extent *rextent; - rextent = list_entry(pos, struct ll_read_extent, re_lli_item); - if (rextent->re_task != current) - continue; - - if (rextent->re_extent.end + PAGE_SIZE < rextent->re_extent.end) - /* extent wrapping */ - extent_end = ~0; - else { - extent_end = (rextent->re_extent.end + PAGE_SIZE) - << PAGE_CACHE_SHIFT; - /* 32bit indexes, 64bit extents.. */ - if (((u64)extent_end >> PAGE_CACHE_SHIFT) < - rextent->re_extent.end) - extent_end = ~0; - } - break; + if (!lli->lli_smd) { + CDEBUG(D_INODE, "truncate on inode %lu with no objects\n", + inode->i_ino); + GOTO(out_unlock, 0); } - spin_unlock(&lli->lli_read_extent_lock); - - if (extent_end == 0) { - static long next_print; - if (time_after(jiffies, next_print)) { - next_print = jiffies + 30 * HZ; - CDEBUG(D_INODE, "mmap readpage - check locks\n"); - } - end_index = page->index + 1; - } else if (extent_end < end_index) - end_index = extent_end; - - /* to balance the find_get_page ref the other pages get that is - * decrefed on teardown.. */ - page_cache_get(page); - do { - unsigned long index ; - - pgs[npgs].pg = page; - pgs[npgs].off = ((obd_off)page->index) << PAGE_CACHE_SHIFT; - pgs[npgs].flag = 0; - pgs[npgs].count = PAGE_SIZE; - /* XXX Workaround for BA OSTs returning short reads at EOF. - * The linux OST will return the full page, zero-filled at the - * end, which will just overwrite the data we set here. Bug - * 593 relates to fixing this properly. - */ - if (inode->i_size < pgs[npgs].off + PAGE_SIZE) { - int count = inode->i_size - pgs[npgs].off; - void *addr = kmap(page); - pgs[npgs].count = count; - //POISON(addr, 0x7c, count); - memset(addr + count, 0, PAGE_SIZE - count); - kunmap(page); - } - npgs++; - if (npgs == max_pages) - break; + 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); + } - /* - * find pages ahead of us that we can read in. - * grab_cache_page waits on pages that are locked so - * we first try find_get_page, which doesn't. this stops - * the worst case behaviour of racing threads waiting on - * each other, but doesn't remove it entirely. - */ - for (index = page->index + 1, page = NULL; - page == NULL && index < end_index; index++) { - - /* see if the page already exists and needs updating */ - page = find_get_page(inode->i_mapping, index); - if (page) { - if (Page_Uptodate(page) || TryLockPage(page)) - goto out_release; - if (!page->mapping || Page_Uptodate(page)) - goto out_unlock; - } else { - /* ok, we have to create it.. */ - page = grab_cache_page(inode->i_mapping, index); - if (page == NULL) - continue; - if (Page_Uptodate(page)) - goto out_unlock; + 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); } - - break; - - out_unlock: - unlock_page(page); - out_release: page_cache_release(page); - page = NULL; } - - } while (page); - - if ((oa = obdo_alloc()) == NULL) { - CERROR("ENOMEM allocing obdo\n"); - rc = -ENOMEM; - } else if ((set = ptlrpc_prep_set()) == NULL) { - CERROR("ENOMEM allocing request set\n"); - obdo_free(oa); - rc = -ENOMEM; - } else { - struct ll_file_data *fd = file->private_data; - - oa->o_id = lli->lli_smd->lsm_object_id; - memcpy(obdo_handle(oa), &fd->fd_ost_och.och_fh, - sizeof(fd->fd_ost_och.och_fh)); - oa->o_valid = OBD_MD_FLID | OBD_MD_FLHANDLE; - obdo_from_inode(oa, inode, OBD_MD_FLTYPE | OBD_MD_FLATIME); - - rc = obd_brw_async(OBD_BRW_READ, ll_i2obdconn(inode), oa, - ll_i2info(inode)->lli_smd, npgs, pgs, - set, NULL); - if (rc == 0) - rc = ptlrpc_set_wait(set); - ptlrpc_set_destroy(set); - if (rc == 0) - obdo_refresh_inode(inode, oa, oa->o_valid); - if (rc && rc != -EIO) - CERROR("error from obd_brw_async: rc = %d\n", rc); - obdo_free(oa); - } - - while (npgs-- > 0) { - page = pgs[npgs].pg; - - if (rc == 0) - SetPageUptodate(page); - unlock_page(page); - page_cache_release(page); } - kfree(pgs); - RETURN(rc); -} /* ll_readpage */ + 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)); -/* 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. */ -void ll_truncate(struct inode *inode) -{ - struct lov_stripe_md *lsm = ll_i2info(inode)->lli_smd; - struct obdo oa; - int err; - ENTRY; - CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p)\n", inode->i_ino, - inode->i_generation, inode); + 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; - /* object not yet allocated */ - if (!lsm) { - CERROR("truncate on inode %lu with no objects\n", inode->i_ino); - EXIT; - return; - } + 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); - /* vmtruncate will just throw away our dirty pages, make sure - * we don't think they're still dirty, being careful to round - * i_size to the first whole page that was tossed */ - err = ll_clear_dirty_pages(ll_i2obdconn(inode), lsm, - (inode->i_size + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT, - ~0); + ll_inode_size_unlock(inode, 0); - 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); - - CDEBUG(D_INFO, "calling punch for "LPX64" (all bytes after %Lu)\n", - oa.o_id, inode->i_size); - - /* truncate == punch from new size to absolute end of file */ - err = obd_punch(ll_i2obdconn(inode), &oa, lsm, inode->i_size, - OBD_OBJECT_EOF, NULL); - if (err) - CERROR("obd_truncate fails (%d) ino %lu\n", err, inode->i_ino); + 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; -} /* ll_truncate */ -//#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)) + out_unlock: + ll_inode_size_unlock(inode, 0); +} /* ll_truncate */ -static int ll_prepare_write(struct file *file, struct page *page, unsigned from, - unsigned to) +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 ll_file_data *fd = file->private_data; struct lov_stripe_md *lsm = lli->lli_smd; - obd_off offset = ((obd_off)page->index) << PAGE_SHIFT; - struct brw_page pg; + obd_off offset = ((obd_off)page->index) << CFS_PAGE_SHIFT; + struct obd_info oinfo = { { { 0 } } }; + struct brw_page pga; struct obdo oa; + struct ost_lvb lvb; int rc = 0; ENTRY; - if (!PageLocked(page)) - LBUG(); - - if (PageUptodate(page)) - RETURN(0); - - //POISON(addr + from, 0xca, to - from); + LASSERT(PageLocked(page)); + (void)llap_cast_private(page); /* assertion */ /* Check to see if we should return -EIO right away */ - pg.pg = page; - pg.off = offset; - pg.count = PAGE_SIZE; - pg.flag = 0; - rc = obd_brw(OBD_BRW_CHECK, ll_i2obdconn(inode), NULL, lsm, 1,&pg,NULL); + pga.pg = page; + pga.off = offset; + pga.count = CFS_PAGE_SIZE; + pga.flag = 0; + + oa.o_mode = inode->i_mode; + 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)) { + 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); + } - /* If are writing to a new page, no need to read old data. - * the extent locking and getattr procedures in ll_file_write have - * guaranteed that i_size is stable enough for our zeroing needs */ - if (inode->i_size <= offset) { - memset(kmap(page), 0, PAGE_SIZE); + /* 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. */ + 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); } - oa.o_id = lsm->lsm_object_id; - oa.o_mode = inode->i_mode; - memcpy(obdo_handle(&oa), &fd->fd_ost_och.och_fh, - sizeof(fd->fd_ost_och.och_fh)); - oa.o_valid = OBD_MD_FLID |OBD_MD_FLMODE |OBD_MD_FLTYPE |OBD_MD_FLHANDLE; - + /* XXX could be an async ocp read.. read-ahead? */ rc = ll_brw(OBD_BRW_READ, inode, &oa, page, 0); - if (rc == 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); + } EXIT; prepare_done: @@ -433,170 +288,486 @@ static int ll_prepare_write(struct file *file, struct page *page, unsigned from, return rc; } -/* - * background file writeback. This is called regularly from kupdated to write - * dirty data, from kswapd when memory is low, and from filemap_fdatasync when - * super blocks or inodes are synced.. +static int ll_ap_make_ready(void *data, int cmd) +{ + struct ll_async_page *llap; + struct page *page; + ENTRY; + + llap = LLAP_FROM_COOKIE(data); + page = llap->llap_page; + + 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); + + LASSERT(!PageWriteback(page)); + + /* 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 */ + 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 + * write length of a given queued page as it builds the RPC containing + * the page: * - * obd_brw errors down in _batch_writepage are ignored, so pages are always - * unlocked. Also, there is nobody to return an error code to from here - the - * application may not even be running anymore. + * 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. * - * this should be async so that things like kswapd can have a chance to - * free some more pages that our allocating writeback may need, but it isn't - * yet. + * The kms serves these purposes as it is set at both truncate and extending + * writes. */ -#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)) -static unsigned long ll_local_cache_dirty_pages; -static unsigned long ll_max_dirty_pages = 20 * 1024 * 1024 / PAGE_SIZE; +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; -static spinlock_t ll_local_cache_page_count_lock = SPIN_LOCK_UNLOCKED; + /* readpage queues with _COUNT_STABLE, shouldn't get here. */ + LASSERT(cmd != OBD_BRW_READ); -int ll_rd_dirty_pages(char *page, char **start, off_t off, int count, int *eof, - void *data) -{ - unsigned long dirty_count; - spin_lock(&ll_local_cache_page_count_lock); - dirty_count = ll_local_cache_dirty_pages; - spin_unlock(&ll_local_cache_page_count_lock); - return snprintf(page, count, "%lu\n", dirty_count); + llap = LLAP_FROM_COOKIE(data); + page = llap->llap_page; + 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 << CFS_PAGE_SHIFT) >= kms) + return 0; + + /* catch sub-page write at end of file */ + if (((__u64)page->index << CFS_PAGE_SHIFT) + CFS_PAGE_SIZE > kms) + return kms % CFS_PAGE_SIZE; + + return CFS_PAGE_SIZE; } -int ll_rd_max_dirty_pages(char *page, char **start, off_t off, int count, - int *eof, void *data) +void ll_inode_fill_obdo(struct inode *inode, int cmd, struct obdo *oa) { - unsigned long max_dirty; - spin_lock(&ll_local_cache_page_count_lock); - max_dirty = ll_max_dirty_pages; - spin_unlock(&ll_local_cache_page_count_lock); - return snprintf(page, count, "%lu\n", max_dirty); + struct lov_stripe_md *lsm; + obd_flag 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) { + oa->o_valid |= OBD_MD_FLEPOCH; + oa->o_easize = ll_i2info(inode)->lli_ioepoch; + + 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); } -int ll_wr_max_dirty_pages(struct file *file, const char *buffer, - unsigned long count, void *data) +static void ll_ap_fill_obdo(void *data, int cmd, struct obdo *oa) { - unsigned long max_dirty; - signed long max_dirty_signed; - char kernbuf[20], *end; - - if (count > (sizeof(kernbuf) - 1)) - return -EINVAL; + struct ll_async_page *llap; + ENTRY; - if (copy_from_user(kernbuf, buffer, count)) - return -EFAULT; + llap = LLAP_FROM_COOKIE(data); + ll_inode_fill_obdo(llap->llap_page->mapping->host, cmd, oa); - kernbuf[count] = '\0'; + EXIT; +} - max_dirty_signed = simple_strtol(kernbuf, &end, 0); - if (kernbuf == end) - return -EINVAL; - max_dirty = (unsigned long)max_dirty_signed; +static void ll_ap_update_obdo(void *data, int cmd, struct obdo *oa, + obd_valid valid) +{ + struct ll_async_page *llap; + ENTRY; -#if 0 - if (max_dirty < ll_local_cache_dirty_pages) - flush_to_new_max_dirty(); -#endif + llap = LLAP_FROM_COOKIE(data); + obdo_from_inode(oa, llap->llap_page->mapping->host, valid); - spin_lock(&ll_local_cache_page_count_lock); - CDEBUG(D_CACHE, "changing max_dirty from %lu to %lu\n", - ll_max_dirty_pages, max_dirty); - ll_max_dirty_pages = max_dirty; - spin_unlock(&ll_local_cache_page_count_lock); - return count; + EXIT; } -static int ll_local_cache_full(void) +static struct obd_capa *ll_ap_lookup_capa(void *data, int cmd) { - int full = 0; - spin_lock(&ll_local_cache_page_count_lock); - if (ll_max_dirty_pages && - ll_local_cache_dirty_pages >= ll_max_dirty_pages) { - full = 1; - } - spin_unlock(&ll_local_cache_page_count_lock); - /* XXX instrument? */ - /* XXX trigger async writeback when full, or 75% of full? */ - return full; -} + struct ll_async_page *llap = LLAP_FROM_COOKIE(data); + int opc = cmd & OBD_BRW_WRITE ? CAPA_OPC_OSS_WRITE : CAPA_OPC_OSS_RW; -static void ll_local_cache_flushed_pages(unsigned long pgcount) -{ - unsigned long dirty_count; - spin_lock(&ll_local_cache_page_count_lock); - dirty_count = ll_local_cache_dirty_pages; - ll_local_cache_dirty_pages -= pgcount; - CDEBUG(D_CACHE, "dirty pages: %lu->%lu)\n", - dirty_count, ll_local_cache_dirty_pages); - spin_unlock(&ll_local_cache_page_count_lock); - LASSERT(dirty_count >= pgcount); + return ll_osscapa_get(llap->llap_page->mapping->host, opc); } -static void ll_local_cache_dirtied_pages(unsigned long pgcount) +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, +}; + +struct ll_async_page *llap_cast_private(struct page *page) { - unsigned long dirty_count; - spin_lock(&ll_local_cache_page_count_lock); - dirty_count = ll_local_cache_dirty_pages; - ll_local_cache_dirty_pages += pgcount; - CDEBUG(D_CACHE, "dirty pages: %lu->%lu\n", - dirty_count, ll_local_cache_dirty_pages); - spin_unlock(&ll_local_cache_page_count_lock); - /* XXX track maximum cached, report to lprocfs */ + 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; } -int ll_clear_dirty_pages(struct lustre_handle *conn, struct lov_stripe_md *lsm, - unsigned long start, unsigned long end) +/* 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) { - unsigned long cleared; - int rc; + struct ll_async_page *llap, dummy_llap = { .llap_magic = 0xd11ad11a }; + unsigned long total, want, count = 0; - ENTRY; - rc = obd_clear_dirty_pages(conn, lsm, start, end, &cleared); - if (!rc) - ll_local_cache_flushed_pages(cleared); - RETURN(rc); + 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; } -int ll_mark_dirty_page(struct lustre_handle *conn, struct lov_stripe_md *lsm, - unsigned long index) +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; int rc; - ENTRY; - if (ll_local_cache_full()) - RETURN(-EDQUOT); - rc = obd_mark_page_dirty(conn, lsm, index); - if (!rc) - ll_local_cache_dirtied_pages(1); - RETURN(rc); + 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) { + /* 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_i2dtexp(page->mapping->host); + if (exp == NULL) + RETURN(ERR_PTR(-EINVAL)); + + /* 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 << CFS_PAGE_SHIFT, + &ll_async_page_ops, llap, &llap->llap_cookie); + if (rc) { + 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 << CFS_PAGE_SHIFT); + /* also zeroing the PRIVBITS low order bitflags */ + __set_page_ll_data(page, llap); + llap->llap_page = page; + spin_lock(&sbi->ll_lock); + sbi->ll_pglist_gen++; + 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); } -static int ll_writepage(struct page *page) +static int queue_or_sync_write(struct obd_export *exp, struct inode *inode, + struct ll_async_page *llap, + unsigned to, obd_flag async_flags) { - struct inode *inode = page->mapping->host; - struct obdo oa; + 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; - CDEBUG(D_CACHE, "page %p [lau %d] inode %p\n", page, - PageLaunder(page), inode); - LASSERT(PageLocked(page)); + /* _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); - oa.o_id = ll_i2info(inode)->lli_smd->lsm_object_id; - oa.o_valid = OBD_MD_FLID; - obdo_from_inode(&oa, inode, OBD_MD_FLTYPE | OBD_MD_FLATIME | - OBD_MD_FLMTIME | OBD_MD_FLCTIME); + LL_CDEBUG_PAGE(D_PAGE, llap->llap_page, "sync write returned %d\n", rc); - RETURN(ll_batch_writepage(inode, &oa, page)); +free_oig: + oig_release(oig); +out: + RETURN(rc); } -/* - * we really don't want to start writeback here, we want to give callers some - * time to further dirty the pages before we write them out. - */ -static int ll_commit_write(struct file *file, struct page *page, - unsigned from, unsigned to) +/* update our write count to account for i_size increases that may have + * happened since we've queued the page for io. */ + +/* 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) { 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; + struct ll_async_page *llap; loff_t size; int rc = 0; ENTRY; @@ -607,152 +778,769 @@ static int ll_commit_write(struct file *file, struct page *page, 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_ORIGIN_COMMIT_WRITE); + if (IS_ERR(llap)) + RETURN(PTR_ERR(llap)); + + exp = ll_i2dtexp(inode); + if (exp == NULL) + RETURN(-EINVAL); + + 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)) { - lprocfs_counter_incr(ll_i2sbi(inode)->ll_stats, - LPROC_LL_DIRTY_MISSES); - rc = ll_mark_dirty_page(ll_i2obdconn(inode), - ll_i2info(inode)->lli_smd, - page->index); - if (rc < 0 && rc != -EDQUOT) - RETURN(rc); /* XXX lproc counter here? */ + ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_DIRTY_MISSES, 1); + + rc = queue_or_sync_write(exp, inode, llap, to, 0); + if (rc) + GOTO(out, rc); } 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); } - size = (((obd_off)page->index) << PAGE_SHIFT) + to; - if (size > inode->i_size) - inode->i_size = size; + /* put the page in the page cache, from now on ll_removepage is + * 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) { + 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); +} - SetPageUptodate(page); - set_page_dirty(page); +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; - /* This means that we've hit either the local cache limit or the limit - * of the OST's grant. */ - if (rc == -EDQUOT) { - struct ll_file_data *fd = file->private_data; - struct obdo oa; - int rc; + 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); - oa.o_id = ll_i2info(inode)->lli_smd->lsm_object_id; - memcpy(obdo_handle(&oa), &fd->fd_ost_och.och_fh, - sizeof(fd->fd_ost_och.och_fh)); - oa.o_valid = OBD_MD_FLID | OBD_MD_FLHANDLE; - obdo_from_inode(&oa, inode, OBD_MD_FLTYPE | OBD_MD_FLATIME | - OBD_MD_FLMTIME | OBD_MD_FLCTIME); + RETURN(ret); +} - rc = ll_batch_writepage(inode, &oa, page); - lock_page(page); /* caller expects to unlock */ - RETURN(rc); +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(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.*/ +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); + 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) + ll_ra_count_put(ll_i2sbi(page->mapping->host), 1); + + if (rc == 0) { + if (cmd & OBD_BRW_READ) { + if (!llap->llap_defer_uptodate) + SetPageUptodate(page); + } else { + llap->llap_write_queued = 0; + } + ClearPageError(page); + } else { + 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); } - RETURN(0); -} /* ll_commit_write */ -#else -static int ll_writepage(struct page *page, - struct writeback_control *wbc) + unlock_page(page); + + 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); + + RETURN(ret); +} + +/* 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; + + LASSERT(!in_interrupt()); + + /* 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(page) == 0) { + EXIT; + return; + } + + LL_CDEBUG_PAGE(D_PAGE, page, "being evicted\n"); + + 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_ORIGIN_REMOVEPAGE); + if (IS_ERR(llap)) { + CERROR("page %p ind %lu couldn't find llap: %ld\n", page, + page->index, PTR_ERR(llap)); + EXIT; + return; + } - return 0; + 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) + 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_pglist_item)) + list_del_init(&llap->llap_pglist_item); + sbi->ll_pglist_gen++; + sbi->ll_async_page_count--; + spin_unlock(&sbi->ll_lock); + OBD_SLAB_FREE(llap, ll_async_page_slab, ll_async_page_slab_size); + EXIT; } -static int ll_commit_write(struct file *file, struct page *page, - unsigned from, unsigned to) + +static int ll_page_matches(struct page *page, int fd_flags) { - return 0; + struct lustre_handle match_lockh = {0}; + struct inode *inode = page->mapping->host; + ldlm_policy_data_t page_extent; + int flags, matches; + ENTRY; + + if (unlikely(fd_flags & LL_FILE_GROUP_LOCKED)) + RETURN(1); + + page_extent.l_extent.start = (__u64)page->index << CFS_PAGE_SHIFT; + page_extent.l_extent.end = + 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); + RETURN(matches); } -#endif -#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)) -static int ll_direct_IO(int rw, struct inode *inode, struct kiobuf *iobuf, - unsigned long blocknr, int blocksize) +static int ll_issue_page_read(struct obd_export *exp, + struct ll_async_page *llap, + struct obd_io_group *oig, int defer) { - struct ll_inode_info *lli = ll_i2info(inode); - struct lov_stripe_md *lsm = lli->lli_smd; - struct brw_page *pga; - struct ptlrpc_request_set *set; - struct obdo oa; - int length, i, flags, rc = 0; - loff_t offset; + 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, + 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); + } + 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 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, + 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; + unsigned int gfp_mask; + struct inode *inode; + struct lov_stripe_md *lsm; + struct ll_ra_read *bead; + struct ost_lvb lvb; ENTRY; - if (!lsm || !lsm->lsm_object_id) - RETURN(-EBADF); + 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); + } - /* FIXME: io smaller than PAGE_SIZE is broken on ia64 */ - if ((iobuf->offset & (PAGE_SIZE - 1)) || - (iobuf->length & (PAGE_SIZE - 1))) - RETURN(-EINVAL); + 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; + } + 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); - set = ptlrpc_prep_set(); - if (set == NULL) - RETURN(-ENOMEM); - - OBD_ALLOC(pga, sizeof(*pga) * iobuf->nr_pages); - if (!pga) { - ptlrpc_set_destroy(set); - RETURN(-ENOMEM); - } - - flags = (rw == WRITE ? OBD_BRW_CREATE : 0) /* | OBD_BRW_DIRECTIO */; - offset = ((obd_off)blocknr << inode->i_blkbits); - length = iobuf->length; - - for (i = 0, length = iobuf->length; length > 0; - length -= pga[i].count, offset += pga[i].count, i++) { /*i last!*/ - pga[i].pg = iobuf->maplist[i]; - pga[i].off = offset; - /* To the end of the page, or the length, whatever is less */ - pga[i].count = min_t(int, PAGE_SIZE - (offset & ~PAGE_MASK), - length); - pga[i].flag = flags; - if (rw == READ) { - //POISON(kmap(iobuf->maplist[i]), 0xc5, PAGE_SIZE); - //kunmap(iobuf->maplist[i]); + if (end == 0) { + ll_ra_stats_inc(mapping, RA_STAT_ZERO_WINDOW); + RETURN(0); + } + + 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); + + 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_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_ORIGIN_READAHEAD); + if (IS_ERR(llap) || llap->llap_defer_uptodate) + goto next_page; + + /* 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|LL_FILE_READAHEAD)) <= 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; + } + + 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"); + } else { + next_page: + LL_CDEBUG_PAGE(D_READA | D_PAGE, page, + "skipping read-ahead\n"); + + unlock_page(page); + } + page_cache_release(page); } - oa.o_id = lsm->lsm_object_id; - oa.o_valid = OBD_MD_FLID; - obdo_from_inode(&oa, inode, OBD_MD_FLTYPE | OBD_MD_FLATIME | - OBD_MD_FLMTIME | OBD_MD_FLCTIME); + LASSERTF(reserved >= 0, "reserved %lu\n", reserved); + if (reserved != 0) + 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); + } - if (rw == WRITE) - lprocfs_counter_add(ll_i2sbi(inode)->ll_stats, - LPROC_LL_DIRECT_WRITE, iobuf->length); - else - lprocfs_counter_add(ll_i2sbi(inode)->ll_stats, - LPROC_LL_DIRECT_READ, iobuf->length); - rc = obd_brw_async(rw == WRITE ? OBD_BRW_WRITE : OBD_BRW_READ, - ll_i2obdconn(inode), &oa, lsm, iobuf->nr_pages, pga, - set, NULL); - if (rc) { - CDEBUG(rc == -ENOSPC ? D_INODE : D_ERROR, - "error from obd_brw_async: rc = %d\n", rc); - } else { - rc = ptlrpc_set_wait(set); - if (rc) - CERROR("error from callback: rc = %d\n", rc); + RETURN(ret); +} + +static void ras_set_start(struct ll_readahead_state *ras, unsigned long index) +{ + 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) +{ + ras->ras_last_readpage = index; + ras->ras_consecutive_requests = 0; + ras->ras_consecutive_pages = 0; + ras->ras_window_len = 0; + ras_set_start(ras, index); + ras->ras_next_readahead = max(ras->ras_window_start, index); + + RAS_CDEBUG(ras); +} + +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_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); + + 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); } - ptlrpc_set_destroy(set); - if (rc == 0) - rc = iobuf->length; - OBD_FREE(pga, sizeof(*pga) * iobuf->nr_pages); + ras->ras_last_readpage = index; + ras->ras_consecutive_pages++; + ras_set_start(ras, index); + ras->ras_next_readahead = max(ras->ras_window_start, + ras->ras_next_readahead); + + /* 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); + } + + /* 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); } -#endif -//#endif +/* + * 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) +{ + struct ll_file_data *fd = LUSTRE_FPRIVATE(filp); + struct inode *inode = page->mapping->host; + struct obd_export *exp; + struct ll_async_page *llap; + struct obd_io_group *oig = NULL; + int rc; + ENTRY; + + LASSERT(PageLocked(page)); + LASSERT(!PageUptodate(page)); + CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p),offset=%Lu=%#Lx\n", + inode->i_ino, inode->i_generation, inode, + (((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); + } -struct address_space_operations ll_aops = { - readpage: ll_readpage, -#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,5,0)) - direct_IO: ll_direct_IO, -#endif - writepage: ll_writepage, - sync_page: block_sync_page, - prepare_write: ll_prepare_write, - commit_write: ll_commit_write, - bmap: NULL -//#endif -}; + 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_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, + NULL, oig); + LL_CDEBUG_PAGE(D_PAGE, page, "marking uptodate from defer\n"); + SetPageUptodate(page); + unlock_page(page); + GOTO(out_oig, rc = 0); + } + + 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) { + 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 << CFS_PAGE_SHIFT); + } + } + + rc = ll_issue_page_read(exp, llap, oig, 0); + if (rc) + GOTO(out, rc); + + LL_CDEBUG_PAGE(D_PAGE, page, "queued readpage\n"); + if (ll_i2sbi(inode)->ll_ra_info.ra_max_pages) + ll_readahead(&fd->fd_ras, exp, page->mapping, oig, + fd->fd_flags); + + rc = obd_trigger_group_io(exp, ll_i2info(inode)->lli_smd, NULL, oig); + +out: + if (rc) + unlock_page(page); +out_oig: + if (oig != NULL) + oig_release(oig); + RETURN(rc); +}