/* -*- 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.
+ *
+ * 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 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).
*
- * Copyright (c) 2001-2003 Cluster File Systems, Inc.
+ * 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
*
- * This file is part of Lustre, http://www.lustre.org.
+ * 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.
*
- * 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.
+ * GPL HEADER END
+ */
+/*
+ * Copyright 2008 Sun Microsystems, Inc. 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 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.
+ * lustre/lustre/llite/rw26.c
*
- * 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.
+ * Lustre Lite I/O page cache routines for the 2.5/2.6 kernel version
*/
+#ifndef AUTOCONF_INCLUDED
#include <linux/config.h>
+#endif
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/writeback.h>
#include <linux/stat.h>
#include <asm/uaccess.h>
-#include <asm/segment.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/smp_lock.h>
#define DEBUG_SUBSYSTEM S_LLITE
-#include <linux/lustre_mds.h>
-#include <linux/lustre_lite.h>
+//#include <lustre_mdc.h>
+#include <lustre_lite.h>
#include "llite_internal.h"
#include <linux/lustre_compat25.h>
-/* called as the osc engine completes an rpc that included our ocp.
- * the ocp itself holds a reference to the page and will drop it when
- * the page is removed from the page cache. our job is simply to
- * transfer rc into the page and unlock it */
-void ll_complete_writepage_26(struct obd_client_page *ocp, int rc)
+static int ll_writepage_26(struct page *page, struct writeback_control *wbc)
+{
+ return ll_writepage(page);
+}
+
+/* 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 */
+#ifdef HAVE_INVALIDATEPAGE_RETURN_INT
+static int ll_invalidatepage(struct page *page, unsigned long offset)
+{
+ if (offset)
+ return 0;
+ if (PagePrivate(page))
+ ll_removepage(page);
+ return 1;
+}
+#else
+static void ll_invalidatepage(struct page *page, unsigned long offset)
+{
+ if (offset == 0 && PagePrivate(page))
+ ll_removepage(page);
+}
+#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)
+{
+ if (PagePrivate(page))
+ ll_removepage(page);
+ return 1;
+}
+
+static int ll_set_page_dirty(struct page *page)
{
- struct page *page = ocp->ocp_page;
+ struct ll_async_page *llap;
+ ENTRY;
+
+ llap = llap_from_page(page, LLAP_ORIGIN_UNKNOWN);
+ if (IS_ERR(llap))
+ RETURN(PTR_ERR(llap));
+
+ llap_write_pending(page->mapping->host, llap);
+ RETURN(__set_page_dirty_nobuffers(page));
+}
- LASSERT(page->private == (unsigned long)ocp);
- LASSERT(PageLocked(page));
+#define MAX_DIRECTIO_SIZE 2*1024*1024*1024UL
- if (rc != 0) {
- CERROR("writeback error on page %p index %ld: %d\n", page,
- page->index, rc);
- SetPageError(page);
+static inline int ll_get_user_pages(int rw, unsigned long user_addr,
+ size_t size, struct page ***pages)
+{
+ int result = -ENOMEM;
+ int page_count;
+
+ /* set an arbitrary limit to prevent arithmetic overflow */
+ if (size > MAX_DIRECTIO_SIZE) {
+ *pages = NULL;
+ return -EFBIG;
}
- ocp->ocp_flags &= ~OCP_IO_READY;
- /* let everyone get at this page again.. I wonder if this ordering
- * is corect */
- unlock_page(page);
- end_page_writeback(page);
+ page_count = (user_addr + size + CFS_PAGE_SIZE - 1) >> CFS_PAGE_SHIFT;
+ page_count -= user_addr >> CFS_PAGE_SHIFT;
+
+ OBD_ALLOC_WAIT(*pages, page_count * sizeof(**pages));
+ if (*pages) {
+ down_read(¤t->mm->mmap_sem);
+ result = get_user_pages(current, current->mm, user_addr,
+ page_count, (rw == READ), 0, *pages,
+ NULL);
+ up_read(¤t->mm->mmap_sem);
+ if (result < 0)
+ OBD_FREE(*pages, page_count * sizeof(**pages));
+ }
- page_cache_release(page);
+ return result;
}
-static int ll_writepage_26(struct page *page, struct writeback_control *wbc)
+/* 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 (do_dirty)
+ set_page_dirty_lock(pages[i]);
+ page_cache_release(pages[i]);
+ }
+
+ OBD_FREE(pages, npages * sizeof(*pages));
+}
+
+static ssize_t ll_direct_IO_26_seg(int rw, struct inode *inode,
+ struct address_space *mapping,
+ struct obd_info *oinfo,
+ struct ptlrpc_request_set *set,
+ size_t size, loff_t file_offset,
+ struct page **pages, int page_count)
{
- struct obd_client_page *ocp;
+ struct brw_page *pga;
+ int i, rc = 0;
+ size_t length;
ENTRY;
- LASSERT(!PageDirty(page));
- LASSERT(PageLocked(page));
- LASSERT(page->private != 0);
+ OBD_ALLOC(pga, sizeof(*pga) * page_count);
+ if (!pga) {
+ CDEBUG(D_VFSTRACE, "sizeof(*pga) = %u page_count = %u\n",
+ (int)sizeof(*pga), page_count);
+ RETURN(-ENOMEM);
+ }
+
+ for (i = 0, length = size; length > 0;
+ length -=pga[i].count, file_offset +=pga[i].count,i++) {/*i last!*/
+ pga[i].pg = pages[i];
+ pga[i].off = file_offset;
+ /* To the end of the page, or the length, whatever is less */
+ pga[i].count = min_t(int, CFS_PAGE_SIZE -
+ (file_offset & ~CFS_PAGE_MASK),
+ length);
+ pga[i].flag = 0;
+ if (rw == READ)
+ POISON_PAGE(pages[i], 0x0d);
+ }
+
+ rc = obd_brw_async(rw == WRITE ? OBD_BRW_WRITE : OBD_BRW_READ,
+ ll_i2dtexp(inode), oinfo, page_count,
+ pga, NULL, set);
+ if (rc == 0)
+ rc = size;
+
+ OBD_FREE(pga, sizeof(*pga) * page_count);
+ RETURN(rc);
+}
+
+/* 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 file *file = iocb->ki_filp;
+ struct inode *inode = file->f_mapping->host;
+ ssize_t count = iov_length(iov, nr_segs), tot_bytes = 0;
+ struct ll_inode_info *lli = ll_i2info(inode);
+ struct lov_stripe_md *lsm = lli->lli_smd;
+ struct ptlrpc_request_set *set;
+ struct obd_info oinfo;
+ struct obdo oa;
+ unsigned long seg = 0;
+ size_t size = MAX_DIO_SIZE;
+ int opc;
+ ENTRY;
+
+ 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);
- ocp = (struct obd_client_page *)page->private;
- ocp->ocp_flags |= OCP_IO_READY;
+ CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), size="LPSZ" (max %lu), "
+ "offset=%lld=%llx, pages "LPSZ" (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);
- page_cache_get(page);
+ if (rw == WRITE) {
+ ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_DIRECT_WRITE, count);
+ opc = CAPA_OPC_OSS_WRITE;
+ llap_write_pending(inode, NULL);
+ } else {
+ ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_DIRECT_READ, count);
+ opc = CAPA_OPC_OSS_RW;
+ }
+
+ /* 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);
+ }
+
+ set = ptlrpc_prep_set();
+ if (set == NULL)
+ RETURN(-ENOMEM);
+
+ ll_inode_fill_obdo(inode, rw, &oa);
+ oinfo.oi_oa = &oa;
+ oinfo.oi_md = lsm;
+ oinfo.oi_capa = ll_osscapa_get(inode, opc);
+
+ /* need locking between buffered and direct access. and race with
+ *size changing by concurrent truncates and writes. */
+ if (rw == READ)
+ LOCK_INODE_MUTEX(inode);
+
+ for (seg = 0; seg < nr_segs; seg++) {
+ size_t 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;
+ }
- /* filemap_fdatawait() makes me think we need to set PageWriteback
- * on pages that are in flight. But our ocp mechanics doesn't
- * really expect a page to be on both the osc lru and in flight.
- * so for now, we don't unlock the page.. dirtiers whill wait
- * for io to complete */
- SetPageWriteback(page);
+ while (iov_left > 0) {
+ struct page **pages;
+ int page_count;
+ ssize_t result;
+
+ page_count = ll_get_user_pages(rw, user_addr,
+ min(size, iov_left),
+ &pages);
+ LASSERT(page_count != 0);
+ if (page_count > 0) {
+ result = ll_direct_IO_26_seg(rw, inode,
+ file->f_mapping,
+ &oinfo, set,
+ min(size,iov_left),
+ file_offset, pages,
+ page_count);
+ ll_free_user_pages(pages, page_count, rw==READ);
+ } else {
+ result = 0;
+ }
+ if (page_count < 0 || 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 ((page_count == -ENOMEM||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 %u\n",
+ (int)size);
+ continue;
+ }
+
+ if (tot_bytes <= 0)
+ tot_bytes = page_count < 0 ? page_count : result;
+ GOTO(out, tot_bytes);
+ }
+
+ tot_bytes += result;
+ file_offset += result;
+ iov_left -= result;
+ user_addr += result;
+ }
+ }
+out:
+ if (rw == READ)
+ UNLOCK_INODE_MUTEX(inode);
+
+ if (tot_bytes > 0) {
+ int rc;
+
+ rc = ptlrpc_set_wait(set);
+ if (rc) {
+ tot_bytes = rc;
+ } else if (rw == WRITE) {
+ lov_stripe_lock(lsm);
+ obd_adjust_kms(ll_i2dtexp(inode), lsm, file_offset, 0);
+ lov_stripe_unlock(lsm);
+ }
+ }
- /* sadly, not all callers who writepage eventually call sync_page
- * (ahem, kswapd) so we need to raise this page's priority
- * immediately */
- RETURN(ll_sync_page(page));
+ capa_put(oinfo.oi_capa);
+ ptlrpc_set_destroy(set);
+ RETURN(tot_bytes);
}
struct address_space_operations ll_aops = {
- readpage: ll_readpage,
-// readpages: ll_readpages,
-// direct_IO: ll_direct_IO_26,
- writepage: ll_writepage_26,
- writepages: generic_writepages,
- set_page_dirty: __set_page_dirty_nobuffers,
- sync_page: block_sync_page,
- prepare_write: ll_prepare_write,
- commit_write: ll_commit_write,
- bmap: NULL
+ .readpage = ll_readpage,
+// .readpages = ll_readpages,
+ .direct_IO = ll_direct_IO_26,
+ .writepage = ll_writepage_26,
+ .writepages = generic_writepages,
+ .set_page_dirty = ll_set_page_dirty,
+ .sync_page = NULL,
+ .prepare_write = ll_prepare_write,
+ .commit_write = ll_commit_write,
+ .invalidatepage = ll_invalidatepage,
+ .releasepage = ll_releasepage,
+ .bmap = NULL
};
git://git.whamcloud.com / fs / lustre-release.git / blobdiff