-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
+/*
+ * GPL HEADER START
*
- * Lustre Lite I/O page cache routines for the 2.5/2.6 kernel version
+ * 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.
*
- * Copyright (c) 2001-2003 Cluster File Systems, Inc.
+ * 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).
*
- * This file is part of Lustre, http://www.lustre.org.
+ * 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 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.
+ * 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 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.
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
*
- * 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.
+ * Copyright (c) 2011, 2014, Intel Corporation.
+ */
+/*
+ * 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
*/
-#ifdef HAVE_KERNEL_CONFIG_H
-#include <linux/config.h>
-#endif
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
-#include <linux/smp_lock.h>
#include <linux/unistd.h>
-#include <linux/version.h>
-#include <asm/system.h>
#include <asm/uaccess.h>
+#ifdef HAVE_MIGRATE_H
+#include <linux/migrate.h>
+#elif defined(HAVE_MIGRATE_MODE_H)
+#include <linux/migrate_mode.h>
+#endif
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/mpage.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 <lustre_mdc.h>
-#include <lustre_lite.h>
#include "llite_internal.h"
-#include <linux/lustre_compat25.h>
+#include <lustre_compat.h>
-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;
-}
+/**
+ * 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 void ll_invalidatepage(struct page *vmpage,
+#ifdef HAVE_INVALIDATE_RANGE
+ unsigned int offset, unsigned int length
#else
-static void ll_invalidatepage(struct page *page, unsigned long offset)
-{
- if (offset == 0 && PagePrivate(page))
- ll_removepage(page);
-}
+ unsigned long offset
#endif
-static int ll_releasepage(struct page *page, gfp_t gfp_mask)
+ )
{
- if (PagePrivate(page))
- ll_removepage(page);
- return 1;
+ struct inode *inode;
+ struct lu_env *env;
+ struct cl_page *page;
+ struct cl_object *obj;
+
+ __u16 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
+ */
+#ifdef HAVE_INVALIDATE_RANGE
+ if (offset == 0 && length == PAGE_CACHE_SIZE) {
+#else
+ if (offset == 0) {
+#endif
+ 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) {
+ cl_page_delete(env, page);
+ cl_page_put(env, page);
+ }
+ } else
+ LASSERT(vmpage->private == 0);
+ cl_env_put(env, &refcheck);
+ }
+ }
}
-static int ll_set_page_dirty(struct page *page)
+#ifdef HAVE_RELEASEPAGE_WITH_INT
+#define RELEASEPAGE_ARG_TYPE int
+#else
+#define RELEASEPAGE_ARG_TYPE gfp_t
+#endif
+static int ll_releasepage(struct page *vmpage, RELEASEPAGE_ARG_TYPE gfp_mask)
{
- 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));
+ struct lu_env *env;
+ void *cookie;
+ struct cl_object *obj;
+ struct cl_page *page;
+ struct address_space *mapping;
+ int result = 0;
+
+ LASSERT(PageLocked(vmpage));
+ if (PageWriteback(vmpage) || PageDirty(vmpage))
+ return 0;
+
+ mapping = vmpage->mapping;
+ if (mapping == NULL)
+ return 1;
+
+ obj = ll_i2info(mapping->host)->lli_clob;
+ if (obj == NULL)
+ return 1;
+
+ /* 1 for caller, 1 for cl_page and 1 for page cache */
+ if (page_count(vmpage) > 3)
+ return 0;
+
+ page = cl_vmpage_page(vmpage, obj);
+ if (page == NULL)
+ return 1;
+
+ cookie = cl_env_reenter();
+ env = cl_env_percpu_get();
+ LASSERT(!IS_ERR(env));
+
+ if (!cl_page_in_use(page)) {
+ result = 1;
+ cl_page_delete(env, page);
+ }
+
+ /* To use percpu env array, the call path can not be rescheduled;
+ * otherwise percpu array will be messed if ll_releaspage() called
+ * again on the same CPU.
+ *
+ * If this page holds the last refc of cl_object, the following
+ * call path may cause reschedule:
+ * cl_page_put -> cl_page_free -> cl_object_put ->
+ * lu_object_put -> lu_object_free -> lov_delete_raid0.
+ *
+ * However, the kernel can't get rid of this inode until all pages have
+ * been cleaned up. Now that we hold page lock here, it's pretty safe
+ * that we won't get into object delete path.
+ */
+ LASSERT(cl_object_refc(obj) > 1);
+ cl_page_put(env, page);
+
+ cl_env_percpu_put(env);
+ cl_env_reexit(cookie);
+ return result;
}
#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)
+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)
{
- int result = -ENOMEM;
- int page_count;
+ 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;
+ size_t size = pv->ldp_size;
+ int page_count = pv->ldp_nr;
+ struct page **pages = pv->ldp_pages;
+ size_t 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) {
+ struct page *vmpage = cl_page_vmpage(clp);
+ struct page *src_page;
+ struct page *dst_page;
+ void *src;
+ void *dst;
+
+ src_page = (rw == WRITE) ? pages[i] : vmpage;
+ dst_page = (rw == WRITE) ? vmpage : pages[i];
+
+ src = ll_kmap_atomic(src_page, KM_USER0);
+ dst = ll_kmap_atomic(dst_page, KM_USER1);
+ memcpy(dst, src, min(page_size, size));
+ ll_kunmap_atomic(dst, KM_USER1);
+ ll_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;
+ }
+ }
- /* set an arbitrary limit to prevent arithmetic overflow */
- if (size > MAX_DIRECTIO_SIZE) {
- *pages = NULL;
- return -EFBIG;
+ 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;
}
- 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));
+ if (rc == 0 && io_pages) {
+ rc = cl_io_submit_sync(env, io,
+ rw == READ ? CRT_READ : CRT_WRITE,
+ queue, 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);
- return result;
+static ssize_t
+ll_direct_IO_seg(const struct lu_env *env, struct cl_io *io, int rw,
+ struct inode *inode, 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);
}
/* 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));
+ 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]);
+ }
+
+#if defined(HAVE_DIRECTIO_ITER) || defined(HAVE_IOV_ITER_RW)
+ kvfree(pages);
+#else
+ OBD_FREE_LARGE(pages, npages * sizeof(*pages));
+#endif
}
-static ssize_t ll_direct_IO_26_seg(int rw, struct inode *inode,
- struct address_space *mapping,
- struct lov_stripe_md *lsm,
- size_t size, loff_t file_offset,
- struct page **pages, int page_count)
-{
- struct brw_page *pga;
- struct obdo oa;
- int opc, i, rc = 0;
- size_t length;
- struct obd_capa *ocapa;
- loff_t file_offset_orig = file_offset;
- ENTRY;
-
- 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);
- }
+#ifdef KMALLOC_MAX_SIZE
+#define MAX_MALLOC KMALLOC_MAX_SIZE
+#else
+#define MAX_MALLOC (128 * 1024)
+#endif
- 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);
- }
+/* This is the maximum size of a single O_DIRECT request, based on the
+ * 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. For 4kB PAGE_SIZE this is
+ * up to 22MB for 128kB kmalloc and up to 682MB for 4MB kmalloc. */
+#define MAX_DIO_SIZE ((MAX_MALLOC / sizeof(struct brw_page) * PAGE_CACHE_SIZE) & \
+ ~(DT_MAX_BRW_SIZE - 1))
- ll_inode_fill_obdo(inode, rw, &oa);
-
- if (rw == WRITE) {
- lprocfs_counter_add(ll_i2sbi(inode)->ll_stats,
- LPROC_LL_DIRECT_WRITE, size);
- opc = CAPA_OPC_OSS_WRITE;
- llap_write_pending(inode, NULL);
- } else {
- lprocfs_counter_add(ll_i2sbi(inode)->ll_stats,
- LPROC_LL_DIRECT_READ, size);
- opc = CAPA_OPC_OSS_RW;
- }
- ocapa = ll_osscapa_get(inode, current->fsuid, opc);
- rc = obd_brw_rqset(rw == WRITE ? OBD_BRW_WRITE : OBD_BRW_READ,
- ll_i2dtexp(inode), &oa, lsm, page_count, pga, NULL,
- ocapa);
- capa_put(ocapa);
- if ((rc > 0) && (rw == WRITE)) {
- lov_stripe_lock(lsm);
- obd_adjust_kms(ll_i2dtexp(inode), lsm, file_offset_orig + rc, 0);
- lov_stripe_unlock(lsm);
- }
+#ifndef HAVE_IOV_ITER_RW
+# define iov_iter_rw(iter) rw
+#endif
- OBD_FREE(pga, sizeof(*pga) * page_count);
- RETURN(rc);
+#if defined(HAVE_DIRECTIO_ITER) || defined(HAVE_IOV_ITER_RW)
+static ssize_t
+ll_direct_IO(
+# ifndef HAVE_IOV_ITER_RW
+ int rw,
+# endif
+ struct kiocb *iocb, struct iov_iter *iter,
+ loff_t file_offset)
+{
+ struct lu_env *env;
+ struct cl_io *io;
+ struct file *file = iocb->ki_filp;
+ struct inode *inode = file->f_mapping->host;
+ ssize_t count = iov_iter_count(iter);
+ ssize_t tot_bytes = 0, result = 0;
+ size_t size = MAX_DIO_SIZE;
+ __u16 refcheck;
+
+ /* FIXME: io smaller than PAGE_SIZE is broken on ia64 ??? */
+ if ((file_offset & ~PAGE_MASK) || (count & ~PAGE_MASK))
+ return -EINVAL;
+
+ CDEBUG(D_VFSTRACE, "VFS Op:inode="DFID"(%p), size=%zd (max %lu), "
+ "offset=%lld=%llx, pages %zd (max %lu)\n",
+ PFID(ll_inode2fid(inode)), inode, count, MAX_DIO_SIZE,
+ file_offset, file_offset, count >> PAGE_CACHE_SHIFT,
+ MAX_DIO_SIZE >> PAGE_CACHE_SHIFT);
+
+ /* Check that all user buffers are aligned as well */
+ if (iov_iter_alignment(iter) & ~PAGE_MASK)
+ return -EINVAL;
+
+ env = cl_env_get(&refcheck);
+ LASSERT(!IS_ERR(env));
+ io = vvp_env_io(env)->vui_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 mutex to operate transient pages.
+ */
+ if (iov_iter_rw(iter) == READ)
+ mutex_lock(&inode->i_mutex);
+
+ while (iov_iter_count(iter)) {
+ struct page **pages;
+ size_t offs;
+
+ count = min_t(size_t, iov_iter_count(iter), size);
+ if (iov_iter_rw(iter) == READ) {
+ if (file_offset >= i_size_read(inode))
+ break;
+
+ if (file_offset + count > i_size_read(inode))
+ count = i_size_read(inode) - file_offset;
+ }
+
+ result = iov_iter_get_pages_alloc(iter, &pages, count, &offs);
+ if (likely(result > 0)) {
+ int n = DIV_ROUND_UP(result + offs, PAGE_SIZE);
+
+ result = ll_direct_IO_seg(env, io, iov_iter_rw(iter),
+ inode, result, file_offset,
+ pages, n);
+ ll_free_user_pages(pages, n,
+ iov_iter_rw(iter) == READ);
+
+ }
+ 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 > (PAGE_CACHE_SIZE / sizeof(*pages)) *
+ PAGE_CACHE_SIZE) {
+ size = ((((size / 2) - 1) |
+ ~PAGE_MASK) + 1) & PAGE_MASK;
+ CDEBUG(D_VFSTRACE, "DIO size now %zu\n",
+ size);
+ continue;
+ }
+
+ GOTO(out, result);
+ }
+
+ iov_iter_advance(iter, result);
+ tot_bytes += result;
+ file_offset += result;
+ }
+out:
+ if (iov_iter_rw(iter) == READ)
+ mutex_unlock(&inode->i_mutex);
+
+ if (tot_bytes > 0) {
+ struct vvp_io *vio = vvp_env_io(env);
+
+ /* no commit async for direct IO */
+ vio->u.write.vui_written += tot_bytes;
+ }
+
+ cl_env_put(env, &refcheck);
+ return tot_bytes ? : result;
}
+#else /* !HAVE_DIRECTIO_ITER && !HAVE_IOV_ITER_RW */
-/* 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)
+static inline int ll_get_user_pages(int rw, unsigned long user_addr,
+ size_t size, struct page ***pages,
+ int *max_pages)
{
- 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);
- unsigned long seg = 0;
- size_t size = MAX_DIO_SIZE;
- ENTRY;
+ 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 + PAGE_CACHE_SIZE - 1) >>
+ PAGE_CACHE_SHIFT;
+ *max_pages -= user_addr >> PAGE_CACHE_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;
+}
- if (!lli->lli_smd || !lli->lli_smd->lsm_object_id)
- RETURN(-EBADF);
+static ssize_t
+ll_direct_IO(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;
+ ssize_t count = iov_length(iov, nr_segs);
+ ssize_t tot_bytes = 0, result = 0;
+ unsigned long seg = 0;
+ size_t size = MAX_DIO_SIZE;
+ __u16 refcheck;
+ ENTRY;
/* FIXME: io smaller than PAGE_SIZE is broken on ia64 ??? */
- if ((file_offset & ~CFS_PAGE_MASK) || (count & ~CFS_PAGE_MASK))
+ if ((file_offset & ~PAGE_MASK) || (count & ~PAGE_MASK))
RETURN(-EINVAL);
- 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);
-
- if (rw == WRITE)
- ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_DIRECT_WRITE, count);
- else
- ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_DIRECT_READ, count);
+ CDEBUG(D_VFSTRACE, "VFS Op:inode="DFID"(%p), size=%zd (max %lu), "
+ "offset=%lld=%llx, pages %zd (max %lu)\n",
+ PFID(ll_inode2fid(inode)), inode, count, MAX_DIO_SIZE,
+ file_offset, file_offset, count >> PAGE_CACHE_SHIFT,
+ MAX_DIO_SIZE >> PAGE_CACHE_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))
+ if (((unsigned long)iov[seg].iov_base & ~PAGE_MASK) ||
+ (iov[seg].iov_len & ~PAGE_MASK))
RETURN(-EINVAL);
}
+ env = cl_env_get(&refcheck);
+ LASSERT(!IS_ERR(env));
+ io = vvp_env_io(env)->vui_cl.cis_io;
+ LASSERT(io != NULL);
+
for (seg = 0; seg < nr_segs; seg++) {
- size_t iov_left = iov[seg].iov_len;
+ size_t iov_left = iov[seg].iov_len;
unsigned long user_addr = (unsigned long)iov[seg].iov_base;
+ if (rw == READ) {
+ if (file_offset >= i_size_read(inode))
+ break;
+ if (file_offset + iov_left > i_size_read(inode))
+ iov_left = i_size_read(inode) - file_offset;
+ }
+
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,
- lli->lli_smd,
- min(size,iov_left),
- file_offset, pages,
- page_count);
- ll_free_user_pages(pages, page_count, rw==READ);
+ int page_count, max_pages = 0;
+ size_t 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 << PAGE_CACHE_SHIFT;
+ result = ll_direct_IO_seg(env, io, rw, inode,
+ 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 = 0;
+ result = page_count;
}
- if (page_count < 0 || result <= 0) {
+ 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 ((page_count == -ENOMEM||result == -ENOMEM)&&
- size > (CFS_PAGE_SIZE / sizeof(*pages)) *
- CFS_PAGE_SIZE) {
+ if (result == -ENOMEM &&
+ size > (PAGE_CACHE_SIZE / sizeof(*pages)) *
+ PAGE_CACHE_SIZE) {
size = ((((size / 2) - 1) |
- ~CFS_PAGE_MASK) + 1) &
- CFS_PAGE_MASK;
- CDEBUG(D_VFSTRACE, "DIO size now %u\n",
- (int)size);
+ ~PAGE_CACHE_MASK) + 1) &
+ PAGE_CACHE_MASK;
+ CDEBUG(D_VFSTRACE, "DIO size now %zu\n",
+ size);
continue;
}
- if (tot_bytes > 0)
- RETURN(tot_bytes);
- RETURN(page_count < 0 ? page_count : result);
+ GOTO(out, result);
}
tot_bytes += result;
user_addr += result;
}
}
- RETURN(tot_bytes);
+out:
+ if (tot_bytes > 0) {
+ struct vvp_io *vio = vvp_env_io(env);
+
+ /* no commit async for direct IO */
+ vio->u.write.vui_written += tot_bytes;
+ }
+
+ cl_env_put(env, &refcheck);
+ RETURN(tot_bytes ? tot_bytes : result);
}
+#endif /* HAVE_DIRECTIO_ITER || HAVE_IOV_ITER_RW */
-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 = 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
+/**
+ * Prepare partially written-to page for a write.
+ */
+static int ll_prepare_partial_page(const struct lu_env *env, struct cl_io *io,
+ struct cl_page *pg)
+{
+ struct cl_attr *attr = vvp_env_thread_attr(env);
+ struct cl_object *obj = io->ci_obj;
+ struct vvp_page *vpg = cl_object_page_slice(obj, pg);
+ loff_t offset = cl_offset(obj, vvp_index(vpg));
+ int result;
+
+ cl_object_attr_lock(obj);
+ result = cl_object_attr_get(env, obj, attr);
+ cl_object_attr_unlock(obj);
+ if (result == 0) {
+ /*
+ * If are writing to a new page, no need to read old data.
+ * The extent locking will have updated the KMS, and for our
+ * purposes here we can treat it like i_size.
+ */
+ if (attr->cat_kms <= offset) {
+ char *kaddr = ll_kmap_atomic(vpg->vpg_page, KM_USER0);
+
+ memset(kaddr, 0, cl_page_size(obj));
+ ll_kunmap_atomic(kaddr, KM_USER0);
+ } else if (vpg->vpg_defer_uptodate)
+ vpg->vpg_ra_used = 1;
+ else
+ result = ll_page_sync_io(env, io, pg, CRT_READ);
+ }
+ return result;
+}
+
+static int ll_write_begin(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, void **fsdata)
+{
+ struct ll_cl_context *lcc;
+ const struct lu_env *env;
+ struct cl_io *io;
+ struct cl_page *page;
+
+ struct cl_object *clob = ll_i2info(mapping->host)->lli_clob;
+ pgoff_t index = pos >> PAGE_CACHE_SHIFT;
+ struct page *vmpage = NULL;
+ unsigned from = pos & (PAGE_CACHE_SIZE - 1);
+ unsigned to = from + len;
+ int result = 0;
+ ENTRY;
+
+ CDEBUG(D_VFSTRACE, "Writing %lu of %d to %d bytes\n", index, from, len);
+
+ lcc = ll_cl_find(file);
+ if (lcc == NULL) {
+ io = NULL;
+ GOTO(out, result = -EIO);
+ }
+
+ env = lcc->lcc_env;
+ io = lcc->lcc_io;
+
+ /* To avoid deadlock, try to lock page first. */
+ vmpage = grab_cache_page_nowait(mapping, index);
+
+ if (unlikely(vmpage == NULL ||
+ PageDirty(vmpage) || PageWriteback(vmpage))) {
+ struct vvp_io *vio = vvp_env_io(env);
+ struct cl_page_list *plist = &vio->u.write.vui_queue;
+
+ /* if the page is already in dirty cache, we have to commit
+ * the pages right now; otherwise, it may cause deadlock
+ * because it holds page lock of a dirty page and request for
+ * more grants. It's okay for the dirty page to be the first
+ * one in commit page list, though. */
+ if (vmpage != NULL && plist->pl_nr > 0) {
+ unlock_page(vmpage);
+ page_cache_release(vmpage);
+ vmpage = NULL;
+ }
+
+ /* commit pages and then wait for page lock */
+ result = vvp_io_write_commit(env, io);
+ if (result < 0)
+ GOTO(out, result);
+
+ if (vmpage == NULL) {
+ vmpage = grab_cache_page_write_begin(mapping, index,
+ flags);
+ if (vmpage == NULL)
+ GOTO(out, result = -ENOMEM);
+ }
+ }
+
+ page = cl_page_find(env, clob, vmpage->index, vmpage, CPT_CACHEABLE);
+ if (IS_ERR(page))
+ GOTO(out, result = PTR_ERR(page));
+
+ lcc->lcc_page = page;
+ lu_ref_add(&page->cp_reference, "cl_io", io);
+
+ cl_page_assume(env, io, page);
+ if (!PageUptodate(vmpage)) {
+ /*
+ * We're completely overwriting an existing page,
+ * so _don't_ set it up to date until commit_write
+ */
+ if (from == 0 && to == PAGE_SIZE) {
+ CL_PAGE_HEADER(D_PAGE, env, page, "full page write\n");
+ POISON_PAGE(vmpage, 0x11);
+ } else {
+ /* TODO: can be optimized at OSC layer to check if it
+ * is a lockless IO. In that case, it's not necessary
+ * to read the data. */
+ result = ll_prepare_partial_page(env, io, page);
+ if (result == 0)
+ SetPageUptodate(vmpage);
+ }
+ }
+ if (result < 0)
+ cl_page_unassume(env, io, page);
+ EXIT;
+out:
+ if (result < 0) {
+ if (vmpage != NULL) {
+ unlock_page(vmpage);
+ page_cache_release(vmpage);
+ }
+ if (io)
+ io->ci_result = result;
+ } else {
+ *pagep = vmpage;
+ *fsdata = lcc;
+ }
+ RETURN(result);
+}
+
+static int ll_write_end(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned copied,
+ struct page *vmpage, void *fsdata)
+{
+ struct ll_cl_context *lcc = fsdata;
+ const struct lu_env *env;
+ struct cl_io *io;
+ struct vvp_io *vio;
+ struct cl_page *page;
+ unsigned from = pos & (PAGE_CACHE_SIZE - 1);
+ bool unplug = false;
+ int result = 0;
+ ENTRY;
+
+ page_cache_release(vmpage);
+
+ LASSERT(lcc != NULL);
+ env = lcc->lcc_env;
+ page = lcc->lcc_page;
+ io = lcc->lcc_io;
+ vio = vvp_env_io(env);
+
+ LASSERT(cl_page_is_owned(page, io));
+ if (copied > 0) {
+ struct cl_page_list *plist = &vio->u.write.vui_queue;
+
+ lcc->lcc_page = NULL; /* page will be queued */
+
+ /* Add it into write queue */
+ cl_page_list_add(plist, page);
+ if (plist->pl_nr == 1) /* first page */
+ vio->u.write.vui_from = from;
+ else
+ LASSERT(from == 0);
+ vio->u.write.vui_to = from + copied;
+
+ /* To address the deadlock in balance_dirty_pages() where
+ * this dirty page may be written back in the same thread. */
+ if (PageDirty(vmpage))
+ unplug = true;
+
+ /* We may have one full RPC, commit it soon */
+ if (plist->pl_nr >= PTLRPC_MAX_BRW_PAGES)
+ unplug = true;
+
+ CL_PAGE_DEBUG(D_VFSTRACE, env, page,
+ "queued page: %d.\n", plist->pl_nr);
+ } else {
+ cl_page_disown(env, io, page);
+
+ lcc->lcc_page = NULL;
+ lu_ref_del(&page->cp_reference, "cl_io", io);
+ cl_page_put(env, page);
+
+ /* page list is not contiguous now, commit it now */
+ unplug = true;
+ }
+ if (unplug ||
+ file->f_flags & O_SYNC || IS_SYNC(file->f_path.dentry->d_inode))
+ result = vvp_io_write_commit(env, io);
+
+ if (result < 0)
+ io->ci_result = result;
+ RETURN(result >= 0 ? copied : result);
+}
+
+#ifdef CONFIG_MIGRATION
+static int ll_migratepage(struct address_space *mapping,
+ struct page *newpage, struct page *page
+#ifdef HAVE_MIGRATEPAGE_4ARGS
+ , enum migrate_mode mode
+#endif
+ )
+{
+ /* Always fail page migration until we have a proper implementation */
+ return -EIO;
+}
+#endif
+
+const struct address_space_operations ll_aops = {
+ .readpage = ll_readpage,
+ .direct_IO = ll_direct_IO,
+ .writepage = ll_writepage,
+ .writepages = ll_writepages,
+ .set_page_dirty = __set_page_dirty_nobuffers,
+ .write_begin = ll_write_begin,
+ .write_end = ll_write_end,
+ .invalidatepage = ll_invalidatepage,
+ .releasepage = (void *)ll_releasepage,
+#ifdef CONFIG_MIGRATION
+ .migratepage = ll_migratepage,
+#endif
};
git://git.whamcloud.com / fs / lustre-release.git / blobdiff