2 * -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
3 * vim:expandtab:shiftwidth=8:tabstop=8:
7 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 only,
11 * as published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License version 2 for more details (a copy is included
17 * in the LICENSE file that accompanied this code).
19 * You should have received a copy of the GNU General Public License
20 * version 2 along with this program; If not, see [sun.com URL with a
23 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
24 * CA 95054 USA or visit www.sun.com if you need additional information or
30 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
31 * Use is subject to license terms.
34 * This file is part of Lustre, http://www.lustre.org/
35 * Lustre is a trademark of Sun Microsystems, Inc.
37 * lustre/lustre/llite/rw26.c
39 * Lustre Lite I/O page cache routines for the 2.5/2.6 kernel version
42 #ifndef AUTOCONF_INCLUDED
43 #include <linux/config.h>
45 #include <linux/kernel.h>
47 #include <linux/string.h>
48 #include <linux/stat.h>
49 #include <linux/errno.h>
50 #include <linux/smp_lock.h>
51 #include <linux/unistd.h>
52 #include <linux/version.h>
53 #include <asm/system.h>
54 #include <asm/uaccess.h>
57 #include <linux/buffer_head.h>
58 #include <linux/mpage.h>
59 #include <linux/writeback.h>
60 #include <linux/stat.h>
61 #include <asm/uaccess.h>
63 #include <linux/pagemap.h>
64 #include <linux/smp_lock.h>
66 #define DEBUG_SUBSYSTEM S_LLITE
68 //#include <lustre_mdc.h>
69 #include <lustre_lite.h>
70 #include "llite_internal.h"
71 #include <linux/lustre_compat25.h>
73 static int ll_writepage_26(struct page *page, struct writeback_control *wbc)
75 return ll_writepage(page);
78 /* It is safe to not check anything in invalidatepage/releasepage below
79 because they are run with page locked and all our io is happening with
81 #ifdef HAVE_INVALIDATEPAGE_RETURN_INT
82 static int ll_invalidatepage(struct page *page, unsigned long offset)
86 if (PagePrivate(page))
91 static void ll_invalidatepage(struct page *page, unsigned long offset)
93 if (offset == 0 && PagePrivate(page))
97 static int ll_releasepage(struct page *page, gfp_t gfp_mask)
99 if (PagePrivate(page))
104 static int ll_set_page_dirty(struct page *page)
106 struct ll_async_page *llap;
109 llap = llap_from_page(page, LLAP_ORIGIN_UNKNOWN);
111 RETURN(PTR_ERR(llap));
113 llap_write_pending(page->mapping->host, llap);
114 RETURN(__set_page_dirty_nobuffers(page));
117 #define MAX_DIRECTIO_SIZE 2*1024*1024*1024UL
119 static inline int ll_get_user_pages(int rw, unsigned long user_addr,
120 size_t size, struct page ***pages)
122 int result = -ENOMEM;
125 /* set an arbitrary limit to prevent arithmetic overflow */
126 if (size > MAX_DIRECTIO_SIZE) {
131 page_count = (user_addr + size + CFS_PAGE_SIZE - 1) >> CFS_PAGE_SHIFT;
132 page_count -= user_addr >> CFS_PAGE_SHIFT;
134 OBD_ALLOC_WAIT(*pages, page_count * sizeof(**pages));
136 down_read(¤t->mm->mmap_sem);
137 result = get_user_pages(current, current->mm, user_addr,
138 page_count, (rw == READ), 0, *pages,
140 up_read(¤t->mm->mmap_sem);
142 OBD_FREE(*pages, page_count * sizeof(**pages));
148 /* ll_free_user_pages - tear down page struct array
149 * @pages: array of page struct pointers underlying target buffer */
150 static void ll_free_user_pages(struct page **pages, int npages, int do_dirty)
154 for (i = 0; i < npages; i++) {
156 set_page_dirty_lock(pages[i]);
157 page_cache_release(pages[i]);
160 OBD_FREE(pages, npages * sizeof(*pages));
163 static ssize_t ll_direct_IO_26_seg(int rw, struct inode *inode,
164 struct address_space *mapping,
165 struct obd_info *oinfo,
166 struct ptlrpc_request_set *set,
167 size_t size, loff_t file_offset,
168 struct page **pages, int page_count)
170 struct brw_page *pga;
175 OBD_ALLOC(pga, sizeof(*pga) * page_count);
177 CDEBUG(D_VFSTRACE, "sizeof(*pga) = %u page_count = %u\n",
178 (int)sizeof(*pga), page_count);
182 for (i = 0, length = size; length > 0;
183 length -=pga[i].count, file_offset +=pga[i].count,i++) {/*i last!*/
184 pga[i].pg = pages[i];
185 pga[i].off = file_offset;
186 /* To the end of the page, or the length, whatever is less */
187 pga[i].count = min_t(int, CFS_PAGE_SIZE -
188 (file_offset & ~CFS_PAGE_MASK),
192 POISON_PAGE(pages[i], 0x0d);
195 rc = obd_brw_async(rw == WRITE ? OBD_BRW_WRITE : OBD_BRW_READ,
196 ll_i2dtexp(inode), oinfo, page_count,
201 OBD_FREE(pga, sizeof(*pga) * page_count);
205 /* This is the maximum size of a single O_DIRECT request, based on a 128kB
206 * kmalloc limit. We need to fit all of the brw_page structs, each one
207 * representing PAGE_SIZE worth of user data, into a single buffer, and
208 * then truncate this to be a full-sized RPC. This is 22MB for 4kB pages. */
209 #define MAX_DIO_SIZE ((128 * 1024 / sizeof(struct brw_page) * CFS_PAGE_SIZE) & \
210 ~(PTLRPC_MAX_BRW_SIZE - 1))
211 static ssize_t ll_direct_IO_26(int rw, struct kiocb *iocb,
212 const struct iovec *iov, loff_t file_offset,
213 unsigned long nr_segs)
215 struct file *file = iocb->ki_filp;
216 struct inode *inode = file->f_mapping->host;
217 ssize_t count = iov_length(iov, nr_segs), tot_bytes = 0;
218 struct ll_inode_info *lli = ll_i2info(inode);
219 struct lov_stripe_md *lsm = lli->lli_smd;
220 struct ptlrpc_request_set *set;
221 struct obd_info oinfo;
223 unsigned long seg = 0;
224 size_t size = MAX_DIO_SIZE;
228 if (!lli->lli_smd || !lli->lli_smd->lsm_object_id)
231 /* FIXME: io smaller than PAGE_SIZE is broken on ia64 ??? */
232 if ((file_offset & ~CFS_PAGE_MASK) || (count & ~CFS_PAGE_MASK))
235 CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), size="LPSZ" (max %lu), "
236 "offset=%lld=%llx, pages "LPSZ" (max %lu)\n",
237 inode->i_ino, inode->i_generation, inode, count, MAX_DIO_SIZE,
238 file_offset, file_offset, count >> CFS_PAGE_SHIFT,
239 MAX_DIO_SIZE >> CFS_PAGE_SHIFT);
242 ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_DIRECT_WRITE, count);
243 opc = CAPA_OPC_OSS_WRITE;
244 llap_write_pending(inode, NULL);
246 ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_DIRECT_READ, count);
247 opc = CAPA_OPC_OSS_RW;
250 /* Check that all user buffers are aligned as well */
251 for (seg = 0; seg < nr_segs; seg++) {
252 if (((unsigned long)iov[seg].iov_base & ~CFS_PAGE_MASK) ||
253 (iov[seg].iov_len & ~CFS_PAGE_MASK))
257 set = ptlrpc_prep_set();
261 ll_inode_fill_obdo(inode, rw, &oa);
264 oinfo.oi_capa = ll_osscapa_get(inode, opc);
266 /* need locking between buffered and direct access. and race with
267 *size changing by concurrent truncates and writes. */
269 LOCK_INODE_MUTEX(inode);
271 for (seg = 0; seg < nr_segs; seg++) {
272 size_t iov_left = iov[seg].iov_len;
273 unsigned long user_addr = (unsigned long)iov[seg].iov_base;
276 if (file_offset >= inode->i_size)
278 if (file_offset + iov_left > inode->i_size)
279 iov_left = inode->i_size - file_offset;
282 while (iov_left > 0) {
287 page_count = ll_get_user_pages(rw, user_addr,
290 LASSERT(page_count != 0);
291 if (page_count > 0) {
292 result = ll_direct_IO_26_seg(rw, inode,
298 ll_free_user_pages(pages, page_count, rw==READ);
302 if (page_count < 0 || result <= 0) {
303 /* If we can't allocate a large enough buffer
304 * for the request, shrink it to a smaller
305 * PAGE_SIZE multiple and try again.
306 * We should always be able to kmalloc for a
307 * page worth of page pointers = 4MB on i386. */
308 if ((page_count == -ENOMEM||result == -ENOMEM)&&
309 size > (CFS_PAGE_SIZE / sizeof(*pages)) *
311 size = ((((size / 2) - 1) |
312 ~CFS_PAGE_MASK) + 1) &
314 CDEBUG(D_VFSTRACE, "DIO size now %u\n",
320 tot_bytes = page_count < 0 ? page_count : result;
321 GOTO(out, tot_bytes);
325 file_offset += result;
332 UNLOCK_INODE_MUTEX(inode);
337 rc = ptlrpc_set_wait(set);
340 } else if (rw == WRITE) {
341 lov_stripe_lock(lsm);
342 obd_adjust_kms(ll_i2dtexp(inode), lsm, file_offset, 0);
343 lov_stripe_unlock(lsm);
347 capa_put(oinfo.oi_capa);
348 ptlrpc_set_destroy(set);
352 struct address_space_operations ll_aops = {
353 .readpage = ll_readpage,
354 // .readpages = ll_readpages,
355 .direct_IO = ll_direct_IO_26,
356 .writepage = ll_writepage_26,
357 .writepages = generic_writepages,
358 .set_page_dirty = ll_set_page_dirty,
360 .prepare_write = ll_prepare_write,
361 .commit_write = ll_commit_write,
362 .invalidatepage = ll_invalidatepage,
363 .releasepage = ll_releasepage,