X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lustre%2Fllite%2Frw26.c;h=25ade0e0e0cee9eddd2de9349be6b0f6d041d35b;hp=b9193e8722785d9ef064e333dd0607aa9d58d27b;hb=119036444bc48381b2d5ca3333438000c409046a;hpb=2dc9c16e770415d56839e1996015fec5fab93f29 diff --git a/lustre/llite/rw26.c b/lustre/llite/rw26.c index b9193e8..25ade0e 100644 --- a/lustre/llite/rw26.c +++ b/lustre/llite/rw26.c @@ -1,27 +1,46 @@ /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: * - * Lustre Lite I/O page cache routines for the 2.5/2.6 kernel version + * GPL HEADER START + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * - * Copyright (c) 2001-2003 Cluster File Systems, Inc. + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 only, + * as published by the Free Software Foundation. * - * This file is part of Lustre, http://www.lustre.org. + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License version 2 for more details (a copy is included + * in the LICENSE file that accompanied this code). * - * Lustre is free software; you can redistribute it and/or - * modify it under the terms of version 2 of the GNU General Public - * License as published by the Free Software Foundation. + * You should have received a copy of the GNU General Public License + * version 2 along with this program; If not, see + * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf * - * Lustre is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. * - * You should have received a copy of the GNU General Public License - * along with Lustre; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * GPL HEADER END + */ +/* + * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. + * Use is subject to license terms. + */ +/* + * This file is part of Lustre, http://www.lustre.org/ + * Lustre is a trademark of Sun Microsystems, Inc. + * + * lustre/lustre/llite/rw26.c + * + * Lustre Lite I/O page cache routines for the 2.5/2.6 kernel version */ +#ifndef AUTOCONF_INCLUDED #include +#endif #include #include #include @@ -35,75 +54,491 @@ #include #include -#include #include #include #include -#include #include #include #include #define DEBUG_SUBSYSTEM S_LLITE -#include -#include +//#include +#include #include "llite_internal.h" #include -static int ll_writepage_26(struct page *page, struct writeback_control *wbc) +/** + * Implements Linux VM address_space::invalidatepage() method. This method is + * called when the page is truncate from a file, either as a result of + * explicit truncate, or when inode is removed from memory (as a result of + * final iput(), umount, or memory pressure induced icache shrinking). + * + * [0, offset] bytes of the page remain valid (this is for a case of not-page + * aligned truncate). Lustre leaves partially truncated page in the cache, + * relying on struct inode::i_size to limit further accesses. + */ +static int cl_invalidatepage(struct page *vmpage, unsigned long offset) { - struct inode *inode = page->mapping->host; - struct obd_export *exp; - struct ll_async_page *llap; - int rc; + struct inode *inode; + struct lu_env *env; + struct cl_page *page; + struct cl_object *obj; + + int result; + int refcheck; + + LASSERT(PageLocked(vmpage)); + LASSERT(!PageWriteback(vmpage)); + + /* + * It is safe to not check anything in invalidatepage/releasepage + * below because they are run with page locked and all our io is + * happening with locked page too + */ + result = 0; + if (offset == 0) { + env = cl_env_get(&refcheck); + if (!IS_ERR(env)) { + inode = vmpage->mapping->host; + obj = ll_i2info(inode)->lli_clob; + if (obj != NULL) { + page = cl_vmpage_page(vmpage, obj); + if (page != NULL) { + lu_ref_add(&page->cp_reference, + "delete", vmpage); + cl_page_delete(env, page); + result = 1; + lu_ref_del(&page->cp_reference, + "delete", vmpage); + cl_page_put(env, page); + } + } else + LASSERT(vmpage->private == 0); + cl_env_put(env, &refcheck); + } + } + return result; +} + +#ifdef HAVE_INVALIDATEPAGE_RETURN_INT +static int ll_invalidatepage(struct page *page, unsigned long offset) +{ + return cl_invalidatepage(page, offset); +} +#else /* !HAVE_INVALIDATEPAGE_RETURN_INT */ +static void ll_invalidatepage(struct page *page, unsigned long offset) +{ + cl_invalidatepage(page, offset); +} +#endif + +#ifdef HAVE_RELEASEPAGE_WITH_INT +#define RELEASEPAGE_ARG_TYPE int +#else +#define RELEASEPAGE_ARG_TYPE gfp_t +#endif +static int ll_releasepage(struct page *page, RELEASEPAGE_ARG_TYPE gfp_mask) +{ + void *cookie; + + cookie = cl_env_reenter(); + ll_invalidatepage(page, 0); + cl_env_reexit(cookie); + return 1; +} + +static int ll_set_page_dirty(struct page *vmpage) +{ +#if 0 + struct cl_page *page = vvp_vmpage_page_transient(vmpage); + struct vvp_object *obj = cl_inode2vvp(vmpage->mapping->host); + struct vvp_page *cpg; + + /* + * XXX should page method be called here? + */ + LASSERT(&obj->co_cl == page->cp_obj); + cpg = cl2vvp_page(cl_page_at(page, &vvp_device_type)); + /* + * XXX cannot do much here, because page is possibly not locked: + * sys_munmap()->... + * ->unmap_page_range()->zap_pte_range()->set_page_dirty(). + */ + vvp_write_pending(obj, cpg); +#endif + RETURN(__set_page_dirty_nobuffers(vmpage)); +} + +#define MAX_DIRECTIO_SIZE 2*1024*1024*1024UL + +static inline int ll_get_user_pages(int rw, unsigned long user_addr, + size_t size, struct page ***pages, + int *max_pages) +{ + int result = -ENOMEM; + + /* set an arbitrary limit to prevent arithmetic overflow */ + if (size > MAX_DIRECTIO_SIZE) { + *pages = NULL; + return -EFBIG; + } + + *max_pages = (user_addr + size + CFS_PAGE_SIZE - 1) >> CFS_PAGE_SHIFT; + *max_pages -= user_addr >> CFS_PAGE_SHIFT; + + OBD_ALLOC_LARGE(*pages, *max_pages * sizeof(**pages)); + if (*pages) { + down_read(¤t->mm->mmap_sem); + result = get_user_pages(current, current->mm, user_addr, + *max_pages, (rw == READ), 0, *pages, + NULL); + up_read(¤t->mm->mmap_sem); + if (unlikely(result <= 0)) + OBD_FREE_LARGE(*pages, *max_pages * sizeof(**pages)); + } + + return result; +} + +/* ll_free_user_pages - tear down page struct array + * @pages: array of page struct pointers underlying target buffer */ +static void ll_free_user_pages(struct page **pages, int npages, int do_dirty) +{ + int i; + + for (i = 0; i < npages; i++) { + if (pages[i] == NULL) + break; + if (do_dirty) + set_page_dirty_lock(pages[i]); + page_cache_release(pages[i]); + } + + OBD_FREE_LARGE(pages, npages * sizeof(*pages)); +} + +ssize_t ll_direct_rw_pages(const struct lu_env *env, struct cl_io *io, + int rw, struct inode *inode, + struct ll_dio_pages *pv) +{ + struct cl_page *clp; + struct cl_2queue *queue; + struct cl_object *obj = io->ci_obj; + int i; + ssize_t rc = 0; + loff_t file_offset = pv->ldp_start_offset; + long size = pv->ldp_size; + int page_count = pv->ldp_nr; + struct page **pages = pv->ldp_pages; + long page_size = cl_page_size(obj); + bool do_io; + int io_pages = 0; + ENTRY; + + queue = &io->ci_queue; + cl_2queue_init(queue); + for (i = 0; i < page_count; i++) { + if (pv->ldp_offsets) + file_offset = pv->ldp_offsets[i]; + + LASSERT(!(file_offset & (page_size - 1))); + clp = cl_page_find(env, obj, cl_index(obj, file_offset), + pv->ldp_pages[i], CPT_TRANSIENT); + if (IS_ERR(clp)) { + rc = PTR_ERR(clp); + break; + } + + rc = cl_page_own(env, io, clp); + if (rc) { + LASSERT(clp->cp_state == CPS_FREEING); + cl_page_put(env, clp); + break; + } + + do_io = true; + + /* check the page type: if the page is a host page, then do + * write directly */ + if (clp->cp_type == CPT_CACHEABLE) { + cfs_page_t *vmpage = cl_page_vmpage(env, clp); + cfs_page_t *src_page; + cfs_page_t *dst_page; + void *src; + void *dst; + + src_page = (rw == WRITE) ? pages[i] : vmpage; + dst_page = (rw == WRITE) ? vmpage : pages[i]; + + src = kmap_atomic(src_page, KM_USER0); + dst = kmap_atomic(dst_page, KM_USER1); + memcpy(dst, src, min(page_size, size)); + kunmap_atomic(dst, KM_USER1); + kunmap_atomic(src, KM_USER0); + + /* make sure page will be added to the transfer by + * cl_io_submit()->...->vvp_page_prep_write(). */ + if (rw == WRITE) + set_page_dirty(vmpage); + + if (rw == READ) { + /* do not issue the page for read, since it + * may reread a ra page which has NOT uptodate + * bit set. */ + cl_page_disown(env, io, clp); + do_io = false; + } + } + + if (likely(do_io)) { + cl_2queue_add(queue, clp); + + /* + * Set page clip to tell transfer formation engine + * that page has to be sent even if it is beyond KMS. + */ + cl_page_clip(env, clp, 0, min(size, page_size)); + + ++io_pages; + } + + /* drop the reference count for cl_page_find */ + cl_page_put(env, clp); + size -= page_size; + file_offset += page_size; + } + + if (rc == 0 && io_pages) { + rc = cl_io_submit_sync(env, io, + rw == READ ? CRT_READ : CRT_WRITE, + queue, CRP_NORMAL, 0); + } + if (rc == 0) + rc = pv->ldp_size; + + cl_2queue_discard(env, io, queue); + cl_2queue_disown(env, io, queue); + cl_2queue_fini(env, queue); + RETURN(rc); +} +EXPORT_SYMBOL(ll_direct_rw_pages); + +static ssize_t ll_direct_IO_26_seg(const struct lu_env *env, struct cl_io *io, + int rw, struct inode *inode, + struct address_space *mapping, + size_t size, loff_t file_offset, + struct page **pages, int page_count) +{ + struct ll_dio_pages pvec = { .ldp_pages = pages, + .ldp_nr = page_count, + .ldp_size = size, + .ldp_offsets = NULL, + .ldp_start_offset = file_offset + }; + + return ll_direct_rw_pages(env, io, rw, inode, &pvec); +} + +/* This is the maximum size of a single O_DIRECT request, based on a 128kB + * kmalloc limit. We need to fit all of the brw_page structs, each one + * representing PAGE_SIZE worth of user data, into a single buffer, and + * then truncate this to be a full-sized RPC. This is 22MB for 4kB pages. */ +#define MAX_DIO_SIZE ((128 * 1024 / sizeof(struct brw_page) * CFS_PAGE_SIZE) & \ + ~(PTLRPC_MAX_BRW_SIZE - 1)) +static ssize_t ll_direct_IO_26(int rw, struct kiocb *iocb, + const struct iovec *iov, loff_t file_offset, + unsigned long nr_segs) +{ + struct lu_env *env; + struct cl_io *io; + struct file *file = iocb->ki_filp; + struct inode *inode = file->f_mapping->host; + struct ccc_object *obj = cl_inode2ccc(inode); + long count = iov_length(iov, nr_segs); + long tot_bytes = 0, result = 0; + struct ll_inode_info *lli = ll_i2info(inode); + struct lov_stripe_md *lsm = lli->lli_smd; + unsigned long seg = 0; + long size = MAX_DIO_SIZE; + int refcheck; ENTRY; - LASSERT(!PageDirty(page)); - LASSERT(PageLocked(page)); - - exp = ll_i2obdexp(inode); - if (exp == NULL) - GOTO(out, rc = -EINVAL); - - llap = llap_from_page(page); - if (IS_ERR(llap)) - GOTO(out, rc = PTR_ERR(llap)); - - page_cache_get(page); - if (llap->llap_write_queued) { - LL_CDEBUG_PAGE(D_PAGE, page, "marking urgent\n"); - rc = obd_set_async_flags(exp, ll_i2info(inode)->lli_smd, NULL, - llap->llap_cookie, - ASYNC_READY | ASYNC_URGENT); - } else { - llap->llap_write_queued = 1; - rc = obd_queue_async_io(exp, ll_i2info(inode)->lli_smd, NULL, - llap->llap_cookie, OBD_BRW_WRITE, 0, 0, - 0, ASYNC_READY | ASYNC_URGENT); - if (rc == 0) - LL_CDEBUG_PAGE(D_PAGE, page, "mmap write queued\n"); - else - llap->llap_write_queued = 0; + if (!lli->lli_smd || !lli->lli_smd->lsm_object_id) + RETURN(-EBADF); + + /* FIXME: io smaller than PAGE_SIZE is broken on ia64 ??? */ + if ((file_offset & ~CFS_PAGE_MASK) || (count & ~CFS_PAGE_MASK)) + RETURN(-EINVAL); + + CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), size=%lu (max %lu), " + "offset=%lld=%llx, pages %lu (max %lu)\n", + inode->i_ino, inode->i_generation, inode, count, MAX_DIO_SIZE, + file_offset, file_offset, count >> CFS_PAGE_SHIFT, + MAX_DIO_SIZE >> CFS_PAGE_SHIFT); + + /* Check that all user buffers are aligned as well */ + for (seg = 0; seg < nr_segs; seg++) { + if (((unsigned long)iov[seg].iov_base & ~CFS_PAGE_MASK) || + (iov[seg].iov_len & ~CFS_PAGE_MASK)) + RETURN(-EINVAL); + } + + env = cl_env_get(&refcheck); + LASSERT(!IS_ERR(env)); + io = ccc_env_io(env)->cui_cl.cis_io; + LASSERT(io != NULL); + + /* 0. Need locking between buffered and direct access. and race with + *size changing by concurrent truncates and writes. + * 1. Need inode sem to operate transient pages. */ + if (rw == READ) + LOCK_INODE_MUTEX(inode); + + LASSERT(obj->cob_transient_pages == 0); + for (seg = 0; seg < nr_segs; seg++) { + long iov_left = iov[seg].iov_len; + unsigned long user_addr = (unsigned long)iov[seg].iov_base; + + if (rw == READ) { + if (file_offset >= inode->i_size) + break; + if (file_offset + iov_left > inode->i_size) + iov_left = inode->i_size - file_offset; + } + + while (iov_left > 0) { + struct page **pages; + int page_count, max_pages = 0; + long bytes; + + bytes = min(size,iov_left); + page_count = ll_get_user_pages(rw, user_addr, bytes, + &pages, &max_pages); + if (likely(page_count > 0)) { + if (unlikely(page_count < max_pages)) + bytes = page_count << CFS_PAGE_SHIFT; + result = ll_direct_IO_26_seg(env, io, rw, inode, + file->f_mapping, + bytes, + file_offset, pages, + page_count); + ll_free_user_pages(pages, max_pages, rw==READ); + } else if (page_count == 0) { + GOTO(out, result = -EFAULT); + } else { + result = page_count; + } + if (unlikely(result <= 0)) { + /* If we can't allocate a large enough buffer + * for the request, shrink it to a smaller + * PAGE_SIZE multiple and try again. + * We should always be able to kmalloc for a + * page worth of page pointers = 4MB on i386. */ + if (result == -ENOMEM && + size > (CFS_PAGE_SIZE / sizeof(*pages)) * + CFS_PAGE_SIZE) { + size = ((((size / 2) - 1) | + ~CFS_PAGE_MASK) + 1) & + CFS_PAGE_MASK; + CDEBUG(D_VFSTRACE,"DIO size now %lu\n", + size); + continue; + } + + GOTO(out, result); + } + + tot_bytes += result; + file_offset += result; + iov_left -= result; + user_addr += result; + } } - if (rc) - page_cache_release(page); out: - if (rc) + LASSERT(obj->cob_transient_pages == 0); + if (rw == READ) + UNLOCK_INODE_MUTEX(inode); + + if (tot_bytes > 0) { + if (rw == WRITE) { + lov_stripe_lock(lsm); + obd_adjust_kms(ll_i2dtexp(inode), lsm, file_offset, 0); + lov_stripe_unlock(lsm); + } + } + + cl_env_put(env, &refcheck); + RETURN(tot_bytes ? : result); +} + +#ifdef HAVE_KERNEL_WRITE_BEGIN_END +static int ll_write_begin(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned flags, + struct page **pagep, void **fsdata) +{ + pgoff_t index = pos >> PAGE_CACHE_SHIFT; + struct page *page; + int rc; + unsigned from = pos & (PAGE_CACHE_SIZE - 1); + ENTRY; + + page = grab_cache_page_write_begin(mapping, index, flags); + if (!page) + RETURN(-ENOMEM); + + *pagep = page; + + rc = ll_prepare_write(file, page, from, from + len); + if (rc) { unlock_page(page); + page_cache_release(page); + } RETURN(rc); } +static int ll_write_end(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *page, void *fsdata) +{ + unsigned from = pos & (PAGE_CACHE_SIZE - 1); + int rc; + rc = ll_commit_write(file, page, from, from + copied); + + unlock_page(page); + page_cache_release(page); + return rc?rc:copied; +} +#endif + +#ifdef CONFIG_MIGRATION +int ll_migratepage(struct address_space *mapping, + struct page *newpage, struct page *page) +{ + /* Always fail page migration until we have a proper implementation */ + return -EIO; +} +#endif + struct address_space_operations ll_aops = { .readpage = ll_readpage, // .readpages = ll_readpages, -// .direct_IO = ll_direct_IO_26, - .writepage = ll_writepage_26, + .direct_IO = ll_direct_IO_26, + .writepage = ll_writepage, .writepages = generic_writepages, - .set_page_dirty = __set_page_dirty_nobuffers, + .set_page_dirty = ll_set_page_dirty, .sync_page = NULL, +#ifdef HAVE_KERNEL_WRITE_BEGIN_END + .write_begin = ll_write_begin, + .write_end = ll_write_end, +#else .prepare_write = ll_prepare_write, .commit_write = ll_commit_write, - .removepage = ll_removepage, +#endif + .invalidatepage = ll_invalidatepage, + .releasepage = (void *)ll_releasepage, +#ifdef CONFIG_MIGRATION + .migratepage = ll_migratepage, +#endif .bmap = NULL };