blob: 44db1808cdb598df6b91548410b3634480c06c31 [file] [log] [blame]
Mark Fashehccd979b2005-12-15 14:31:24 -08001/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public
17 * License along with this program; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 021110-1307, USA.
20 */
21
22#include <linux/fs.h>
23#include <linux/slab.h>
24#include <linux/highmem.h>
25#include <linux/pagemap.h>
26#include <asm/byteorder.h>
Mark Fasheh9517bac2007-02-09 20:24:12 -080027#include <linux/swap.h>
Mark Fasheh6af67d82007-03-06 17:24:46 -080028#include <linux/pipe_fs_i.h>
Mark Fasheh628a24f2007-10-30 12:08:32 -070029#include <linux/mpage.h>
Jan Karaa90714c2008-10-09 19:38:40 +020030#include <linux/quotaops.h>
Joseph Qi24c40b32015-02-16 16:00:00 -080031#include <linux/blkdev.h>
Mark Fashehccd979b2005-12-15 14:31:24 -080032
Mark Fashehccd979b2005-12-15 14:31:24 -080033#include <cluster/masklog.h>
34
35#include "ocfs2.h"
36
37#include "alloc.h"
38#include "aops.h"
39#include "dlmglue.h"
40#include "extent_map.h"
41#include "file.h"
42#include "inode.h"
43#include "journal.h"
Mark Fasheh9517bac2007-02-09 20:24:12 -080044#include "suballoc.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080045#include "super.h"
46#include "symlink.h"
Tao Ma293b2f72009-08-25 08:02:48 +080047#include "refcounttree.h"
Tao Ma95581562011-02-22 21:33:59 +080048#include "ocfs2_trace.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080049
50#include "buffer_head_io.h"
Joseph Qi24c40b32015-02-16 16:00:00 -080051#include "dir.h"
52#include "namei.h"
53#include "sysfile.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080054
55static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock,
56 struct buffer_head *bh_result, int create)
57{
58 int err = -EIO;
59 int status;
60 struct ocfs2_dinode *fe = NULL;
61 struct buffer_head *bh = NULL;
62 struct buffer_head *buffer_cache_bh = NULL;
63 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
64 void *kaddr;
65
Tao Ma95581562011-02-22 21:33:59 +080066 trace_ocfs2_symlink_get_block(
67 (unsigned long long)OCFS2_I(inode)->ip_blkno,
68 (unsigned long long)iblock, bh_result, create);
Mark Fashehccd979b2005-12-15 14:31:24 -080069
70 BUG_ON(ocfs2_inode_is_fast_symlink(inode));
71
72 if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) {
73 mlog(ML_ERROR, "block offset > PATH_MAX: %llu",
74 (unsigned long long)iblock);
75 goto bail;
76 }
77
Joel Beckerb657c952008-11-13 14:49:11 -080078 status = ocfs2_read_inode_block(inode, &bh);
Mark Fashehccd979b2005-12-15 14:31:24 -080079 if (status < 0) {
80 mlog_errno(status);
81 goto bail;
82 }
83 fe = (struct ocfs2_dinode *) bh->b_data;
84
Mark Fashehccd979b2005-12-15 14:31:24 -080085 if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb,
86 le32_to_cpu(fe->i_clusters))) {
Rui Xiang7391a292013-11-12 15:06:54 -080087 err = -ENOMEM;
Mark Fashehccd979b2005-12-15 14:31:24 -080088 mlog(ML_ERROR, "block offset is outside the allocated size: "
89 "%llu\n", (unsigned long long)iblock);
90 goto bail;
91 }
92
93 /* We don't use the page cache to create symlink data, so if
94 * need be, copy it over from the buffer cache. */
95 if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) {
96 u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) +
97 iblock;
98 buffer_cache_bh = sb_getblk(osb->sb, blkno);
99 if (!buffer_cache_bh) {
Rui Xiang7391a292013-11-12 15:06:54 -0800100 err = -ENOMEM;
Mark Fashehccd979b2005-12-15 14:31:24 -0800101 mlog(ML_ERROR, "couldn't getblock for symlink!\n");
102 goto bail;
103 }
104
105 /* we haven't locked out transactions, so a commit
106 * could've happened. Since we've got a reference on
107 * the bh, even if it commits while we're doing the
108 * copy, the data is still good. */
109 if (buffer_jbd(buffer_cache_bh)
110 && ocfs2_inode_is_new(inode)) {
Cong Wangc4bc8dc2011-11-25 23:14:34 +0800111 kaddr = kmap_atomic(bh_result->b_page);
Mark Fashehccd979b2005-12-15 14:31:24 -0800112 if (!kaddr) {
113 mlog(ML_ERROR, "couldn't kmap!\n");
114 goto bail;
115 }
116 memcpy(kaddr + (bh_result->b_size * iblock),
117 buffer_cache_bh->b_data,
118 bh_result->b_size);
Cong Wangc4bc8dc2011-11-25 23:14:34 +0800119 kunmap_atomic(kaddr);
Mark Fashehccd979b2005-12-15 14:31:24 -0800120 set_buffer_uptodate(bh_result);
121 }
122 brelse(buffer_cache_bh);
123 }
124
125 map_bh(bh_result, inode->i_sb,
126 le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock);
127
128 err = 0;
129
130bail:
Mark Fasheha81cb882008-10-07 14:25:16 -0700131 brelse(bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800132
Mark Fashehccd979b2005-12-15 14:31:24 -0800133 return err;
134}
135
Tao Ma6f70fa52009-08-25 08:05:12 +0800136int ocfs2_get_block(struct inode *inode, sector_t iblock,
137 struct buffer_head *bh_result, int create)
Mark Fashehccd979b2005-12-15 14:31:24 -0800138{
139 int err = 0;
Mark Fasheh49cb8d22007-03-09 16:21:46 -0800140 unsigned int ext_flags;
Mark Fasheh628a24f2007-10-30 12:08:32 -0700141 u64 max_blocks = bh_result->b_size >> inode->i_blkbits;
142 u64 p_blkno, count, past_eof;
Mark Fasheh25baf2da2007-02-14 15:30:30 -0800143 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
Mark Fashehccd979b2005-12-15 14:31:24 -0800144
Tao Ma95581562011-02-22 21:33:59 +0800145 trace_ocfs2_get_block((unsigned long long)OCFS2_I(inode)->ip_blkno,
146 (unsigned long long)iblock, bh_result, create);
Mark Fashehccd979b2005-12-15 14:31:24 -0800147
148 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE)
149 mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n",
150 inode, inode->i_ino);
151
152 if (S_ISLNK(inode->i_mode)) {
153 /* this always does I/O for some reason. */
154 err = ocfs2_symlink_get_block(inode, iblock, bh_result, create);
155 goto bail;
156 }
157
Mark Fasheh628a24f2007-10-30 12:08:32 -0700158 err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &count,
Mark Fasheh49cb8d22007-03-09 16:21:46 -0800159 &ext_flags);
Mark Fashehccd979b2005-12-15 14:31:24 -0800160 if (err) {
161 mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, "
Mark Fashehb06970532006-03-03 10:24:33 -0800162 "%llu, NULL)\n", err, inode, (unsigned long long)iblock,
163 (unsigned long long)p_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -0800164 goto bail;
165 }
166
Mark Fasheh628a24f2007-10-30 12:08:32 -0700167 if (max_blocks < count)
168 count = max_blocks;
169
Mark Fasheh25baf2da2007-02-14 15:30:30 -0800170 /*
171 * ocfs2 never allocates in this function - the only time we
172 * need to use BH_New is when we're extending i_size on a file
173 * system which doesn't support holes, in which case BH_New
Christoph Hellwigebdec242010-10-06 10:47:23 +0200174 * allows __block_write_begin() to zero.
Coly Lic0420ad2008-06-30 18:45:45 +0800175 *
176 * If we see this on a sparse file system, then a truncate has
177 * raced us and removed the cluster. In this case, we clear
178 * the buffers dirty and uptodate bits and let the buffer code
179 * ignore it as a hole.
Mark Fasheh25baf2da2007-02-14 15:30:30 -0800180 */
Coly Lic0420ad2008-06-30 18:45:45 +0800181 if (create && p_blkno == 0 && ocfs2_sparse_alloc(osb)) {
182 clear_buffer_dirty(bh_result);
183 clear_buffer_uptodate(bh_result);
184 goto bail;
185 }
Mark Fashehccd979b2005-12-15 14:31:24 -0800186
Mark Fasheh49cb8d22007-03-09 16:21:46 -0800187 /* Treat the unwritten extent as a hole for zeroing purposes. */
188 if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN))
Mark Fasheh25baf2da2007-02-14 15:30:30 -0800189 map_bh(bh_result, inode->i_sb, p_blkno);
190
Mark Fasheh628a24f2007-10-30 12:08:32 -0700191 bh_result->b_size = count << inode->i_blkbits;
192
Mark Fasheh25baf2da2007-02-14 15:30:30 -0800193 if (!ocfs2_sparse_alloc(osb)) {
194 if (p_blkno == 0) {
195 err = -EIO;
196 mlog(ML_ERROR,
197 "iblock = %llu p_blkno = %llu blkno=(%llu)\n",
198 (unsigned long long)iblock,
199 (unsigned long long)p_blkno,
200 (unsigned long long)OCFS2_I(inode)->ip_blkno);
201 mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters);
202 dump_stack();
Wengang Wang1f4cea32009-07-13 11:38:58 +0800203 goto bail;
Mark Fasheh25baf2da2007-02-14 15:30:30 -0800204 }
Mark Fashehccd979b2005-12-15 14:31:24 -0800205 }
206
Joel Becker56934862010-07-01 15:13:31 -0700207 past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
Tao Ma95581562011-02-22 21:33:59 +0800208
209 trace_ocfs2_get_block_end((unsigned long long)OCFS2_I(inode)->ip_blkno,
210 (unsigned long long)past_eof);
Joel Becker56934862010-07-01 15:13:31 -0700211 if (create && (iblock >= past_eof))
212 set_buffer_new(bh_result);
213
Mark Fashehccd979b2005-12-15 14:31:24 -0800214bail:
215 if (err < 0)
216 err = -EIO;
217
Mark Fashehccd979b2005-12-15 14:31:24 -0800218 return err;
219}
220
Mark Fasheh1afc32b2007-09-07 14:46:51 -0700221int ocfs2_read_inline_data(struct inode *inode, struct page *page,
222 struct buffer_head *di_bh)
Mark Fasheh6798d352007-09-07 14:05:51 -0700223{
224 void *kaddr;
Jan Karad2849fb2007-12-19 15:24:09 +0100225 loff_t size;
Mark Fasheh6798d352007-09-07 14:05:51 -0700226 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
227
228 if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) {
229 ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag",
230 (unsigned long long)OCFS2_I(inode)->ip_blkno);
231 return -EROFS;
232 }
233
234 size = i_size_read(inode);
235
236 if (size > PAGE_CACHE_SIZE ||
Tiger Yangd9ae49d2009-03-05 11:06:15 +0800237 size > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) {
Mark Fasheh6798d352007-09-07 14:05:51 -0700238 ocfs2_error(inode->i_sb,
Jan Karad2849fb2007-12-19 15:24:09 +0100239 "Inode %llu has with inline data has bad size: %Lu",
240 (unsigned long long)OCFS2_I(inode)->ip_blkno,
241 (unsigned long long)size);
Mark Fasheh6798d352007-09-07 14:05:51 -0700242 return -EROFS;
243 }
244
Cong Wangc4bc8dc2011-11-25 23:14:34 +0800245 kaddr = kmap_atomic(page);
Mark Fasheh6798d352007-09-07 14:05:51 -0700246 if (size)
247 memcpy(kaddr, di->id2.i_data.id_data, size);
248 /* Clear the remaining part of the page */
249 memset(kaddr + size, 0, PAGE_CACHE_SIZE - size);
250 flush_dcache_page(page);
Cong Wangc4bc8dc2011-11-25 23:14:34 +0800251 kunmap_atomic(kaddr);
Mark Fasheh6798d352007-09-07 14:05:51 -0700252
253 SetPageUptodate(page);
254
255 return 0;
256}
257
258static int ocfs2_readpage_inline(struct inode *inode, struct page *page)
259{
260 int ret;
261 struct buffer_head *di_bh = NULL;
Mark Fasheh6798d352007-09-07 14:05:51 -0700262
263 BUG_ON(!PageLocked(page));
Julia Lawall86c838b2008-02-26 21:45:56 +0100264 BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL));
Mark Fasheh6798d352007-09-07 14:05:51 -0700265
Joel Beckerb657c952008-11-13 14:49:11 -0800266 ret = ocfs2_read_inode_block(inode, &di_bh);
Mark Fasheh6798d352007-09-07 14:05:51 -0700267 if (ret) {
268 mlog_errno(ret);
269 goto out;
270 }
271
272 ret = ocfs2_read_inline_data(inode, page, di_bh);
273out:
274 unlock_page(page);
275
276 brelse(di_bh);
277 return ret;
278}
279
Mark Fashehccd979b2005-12-15 14:31:24 -0800280static int ocfs2_readpage(struct file *file, struct page *page)
281{
282 struct inode *inode = page->mapping->host;
Mark Fasheh6798d352007-09-07 14:05:51 -0700283 struct ocfs2_inode_info *oi = OCFS2_I(inode);
Mark Fashehccd979b2005-12-15 14:31:24 -0800284 loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT;
285 int ret, unlock = 1;
286
Tao Ma95581562011-02-22 21:33:59 +0800287 trace_ocfs2_readpage((unsigned long long)oi->ip_blkno,
288 (page ? page->index : 0));
Mark Fashehccd979b2005-12-15 14:31:24 -0800289
Mark Fashehe63aecb62007-10-18 15:30:42 -0700290 ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page);
Mark Fashehccd979b2005-12-15 14:31:24 -0800291 if (ret != 0) {
292 if (ret == AOP_TRUNCATED_PAGE)
293 unlock = 0;
294 mlog_errno(ret);
295 goto out;
296 }
297
Mark Fasheh6798d352007-09-07 14:05:51 -0700298 if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
Jan Karac7e25e62011-06-23 22:51:47 +0200299 /*
300 * Unlock the page and cycle ip_alloc_sem so that we don't
301 * busyloop waiting for ip_alloc_sem to unlock
302 */
Mark Fashehe9dfc0b2007-05-14 11:38:51 -0700303 ret = AOP_TRUNCATED_PAGE;
Jan Karac7e25e62011-06-23 22:51:47 +0200304 unlock_page(page);
305 unlock = 0;
306 down_read(&oi->ip_alloc_sem);
307 up_read(&oi->ip_alloc_sem);
Mark Fashehe63aecb62007-10-18 15:30:42 -0700308 goto out_inode_unlock;
Mark Fashehe9dfc0b2007-05-14 11:38:51 -0700309 }
Mark Fashehccd979b2005-12-15 14:31:24 -0800310
311 /*
312 * i_size might have just been updated as we grabed the meta lock. We
313 * might now be discovering a truncate that hit on another node.
314 * block_read_full_page->get_block freaks out if it is asked to read
315 * beyond the end of a file, so we check here. Callers
Nick Piggin54cb8822007-07-19 01:46:59 -0700316 * (generic_file_read, vm_ops->fault) are clever enough to check i_size
Mark Fashehccd979b2005-12-15 14:31:24 -0800317 * and notice that the page they just read isn't needed.
318 *
319 * XXX sys_readahead() seems to get that wrong?
320 */
321 if (start >= i_size_read(inode)) {
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800322 zero_user(page, 0, PAGE_SIZE);
Mark Fashehccd979b2005-12-15 14:31:24 -0800323 SetPageUptodate(page);
324 ret = 0;
325 goto out_alloc;
326 }
327
Mark Fasheh6798d352007-09-07 14:05:51 -0700328 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
329 ret = ocfs2_readpage_inline(inode, page);
330 else
331 ret = block_read_full_page(page, ocfs2_get_block);
Mark Fashehccd979b2005-12-15 14:31:24 -0800332 unlock = 0;
333
Mark Fashehccd979b2005-12-15 14:31:24 -0800334out_alloc:
335 up_read(&OCFS2_I(inode)->ip_alloc_sem);
Mark Fashehe63aecb62007-10-18 15:30:42 -0700336out_inode_unlock:
337 ocfs2_inode_unlock(inode, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -0800338out:
339 if (unlock)
340 unlock_page(page);
Mark Fashehccd979b2005-12-15 14:31:24 -0800341 return ret;
342}
343
Mark Fasheh628a24f2007-10-30 12:08:32 -0700344/*
345 * This is used only for read-ahead. Failures or difficult to handle
346 * situations are safe to ignore.
347 *
348 * Right now, we don't bother with BH_Boundary - in-inode extent lists
349 * are quite large (243 extents on 4k blocks), so most inodes don't
350 * grow out to a tree. If need be, detecting boundary extents could
351 * trivially be added in a future version of ocfs2_get_block().
352 */
353static int ocfs2_readpages(struct file *filp, struct address_space *mapping,
354 struct list_head *pages, unsigned nr_pages)
355{
356 int ret, err = -EIO;
357 struct inode *inode = mapping->host;
358 struct ocfs2_inode_info *oi = OCFS2_I(inode);
359 loff_t start;
360 struct page *last;
361
362 /*
363 * Use the nonblocking flag for the dlm code to avoid page
364 * lock inversion, but don't bother with retrying.
365 */
366 ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK);
367 if (ret)
368 return err;
369
370 if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
371 ocfs2_inode_unlock(inode, 0);
372 return err;
373 }
374
375 /*
376 * Don't bother with inline-data. There isn't anything
377 * to read-ahead in that case anyway...
378 */
379 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
380 goto out_unlock;
381
382 /*
383 * Check whether a remote node truncated this file - we just
384 * drop out in that case as it's not worth handling here.
385 */
386 last = list_entry(pages->prev, struct page, lru);
387 start = (loff_t)last->index << PAGE_CACHE_SHIFT;
388 if (start >= i_size_read(inode))
389 goto out_unlock;
390
391 err = mpage_readpages(mapping, pages, nr_pages, ocfs2_get_block);
392
393out_unlock:
394 up_read(&oi->ip_alloc_sem);
395 ocfs2_inode_unlock(inode, 0);
396
397 return err;
398}
399
Mark Fashehccd979b2005-12-15 14:31:24 -0800400/* Note: Because we don't support holes, our allocation has
401 * already happened (allocation writes zeros to the file data)
402 * so we don't have to worry about ordered writes in
403 * ocfs2_writepage.
404 *
405 * ->writepage is called during the process of invalidating the page cache
406 * during blocked lock processing. It can't block on any cluster locks
407 * to during block mapping. It's relying on the fact that the block
408 * mapping can't have disappeared under the dirty pages that it is
409 * being asked to write back.
410 */
411static int ocfs2_writepage(struct page *page, struct writeback_control *wbc)
412{
Tao Ma95581562011-02-22 21:33:59 +0800413 trace_ocfs2_writepage(
414 (unsigned long long)OCFS2_I(page->mapping->host)->ip_blkno,
415 page->index);
Mark Fashehccd979b2005-12-15 14:31:24 -0800416
Tao Ma95581562011-02-22 21:33:59 +0800417 return block_write_full_page(page, ocfs2_get_block, wbc);
Mark Fashehccd979b2005-12-15 14:31:24 -0800418}
419
Mark Fashehccd979b2005-12-15 14:31:24 -0800420/* Taken from ext3. We don't necessarily need the full blown
421 * functionality yet, but IMHO it's better to cut and paste the whole
422 * thing so we can avoid introducing our own bugs (and easily pick up
423 * their fixes when they happen) --Mark */
Mark Fasheh60b11392007-02-16 11:46:50 -0800424int walk_page_buffers( handle_t *handle,
425 struct buffer_head *head,
426 unsigned from,
427 unsigned to,
428 int *partial,
429 int (*fn)( handle_t *handle,
430 struct buffer_head *bh))
Mark Fashehccd979b2005-12-15 14:31:24 -0800431{
432 struct buffer_head *bh;
433 unsigned block_start, block_end;
434 unsigned blocksize = head->b_size;
435 int err, ret = 0;
436 struct buffer_head *next;
437
438 for ( bh = head, block_start = 0;
439 ret == 0 && (bh != head || !block_start);
440 block_start = block_end, bh = next)
441 {
442 next = bh->b_this_page;
443 block_end = block_start + blocksize;
444 if (block_end <= from || block_start >= to) {
445 if (partial && !buffer_uptodate(bh))
446 *partial = 1;
447 continue;
448 }
449 err = (*fn)(handle, bh);
450 if (!ret)
451 ret = err;
452 }
453 return ret;
454}
455
Mark Fashehccd979b2005-12-15 14:31:24 -0800456static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block)
457{
458 sector_t status;
459 u64 p_blkno = 0;
460 int err = 0;
461 struct inode *inode = mapping->host;
462
Tao Ma95581562011-02-22 21:33:59 +0800463 trace_ocfs2_bmap((unsigned long long)OCFS2_I(inode)->ip_blkno,
464 (unsigned long long)block);
Mark Fashehccd979b2005-12-15 14:31:24 -0800465
466 /* We don't need to lock journal system files, since they aren't
467 * accessed concurrently from multiple nodes.
468 */
469 if (!INODE_JOURNAL(inode)) {
Mark Fashehe63aecb62007-10-18 15:30:42 -0700470 err = ocfs2_inode_lock(inode, NULL, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -0800471 if (err) {
472 if (err != -ENOENT)
473 mlog_errno(err);
474 goto bail;
475 }
476 down_read(&OCFS2_I(inode)->ip_alloc_sem);
477 }
478
Mark Fasheh6798d352007-09-07 14:05:51 -0700479 if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
480 err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL,
481 NULL);
Mark Fashehccd979b2005-12-15 14:31:24 -0800482
483 if (!INODE_JOURNAL(inode)) {
484 up_read(&OCFS2_I(inode)->ip_alloc_sem);
Mark Fashehe63aecb62007-10-18 15:30:42 -0700485 ocfs2_inode_unlock(inode, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -0800486 }
487
488 if (err) {
489 mlog(ML_ERROR, "get_blocks() failed, block = %llu\n",
490 (unsigned long long)block);
491 mlog_errno(err);
492 goto bail;
493 }
494
Mark Fashehccd979b2005-12-15 14:31:24 -0800495bail:
496 status = err ? 0 : p_blkno;
497
Mark Fashehccd979b2005-12-15 14:31:24 -0800498 return status;
499}
500
501/*
502 * TODO: Make this into a generic get_blocks function.
503 *
504 * From do_direct_io in direct-io.c:
505 * "So what we do is to permit the ->get_blocks function to populate
506 * bh.b_size with the size of IO which is permitted at this offset and
507 * this i_blkbits."
508 *
509 * This function is called directly from get_more_blocks in direct-io.c.
510 *
511 * called like this: dio->get_blocks(dio->inode, fs_startblk,
512 * fs_count, map_bh, dio->rw == WRITE);
513 */
514static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
Mark Fashehccd979b2005-12-15 14:31:24 -0800515 struct buffer_head *bh_result, int create)
516{
517 int ret;
Joseph Qi49255dc2015-02-16 16:00:03 -0800518 u32 cpos = 0;
519 int alloc_locked = 0;
Mark Fasheh4f902c32007-03-09 16:26:50 -0800520 u64 p_blkno, inode_blocks, contig_blocks;
Mark Fasheh49cb8d22007-03-09 16:21:46 -0800521 unsigned int ext_flags;
Florin Malita184d7d22006-06-03 19:30:10 -0400522 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -0800523 unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
Joseph Qi49255dc2015-02-16 16:00:03 -0800524 unsigned long len = bh_result->b_size;
525 unsigned int clusters_to_alloc = 0;
526
527 cpos = ocfs2_blocks_to_clusters(inode->i_sb, iblock);
Mark Fashehccd979b2005-12-15 14:31:24 -0800528
Mark Fashehccd979b2005-12-15 14:31:24 -0800529 /* This function won't even be called if the request isn't all
530 * nicely aligned and of the right size, so there's no need
531 * for us to check any of that. */
532
Mark Fasheh25baf2da2007-02-14 15:30:30 -0800533 inode_blocks = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
Mark Fasheh564f8a32006-12-14 13:01:05 -0800534
Mark Fashehccd979b2005-12-15 14:31:24 -0800535 /* This figures out the size of the next contiguous block, and
536 * our logical offset */
Mark Fasheh363041a2007-01-17 12:31:35 -0800537 ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno,
Mark Fasheh49cb8d22007-03-09 16:21:46 -0800538 &contig_blocks, &ext_flags);
Mark Fashehccd979b2005-12-15 14:31:24 -0800539 if (ret) {
540 mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n",
541 (unsigned long long)iblock);
542 ret = -EIO;
543 goto bail;
544 }
545
Tao Macbaee472010-02-26 10:54:52 +0800546 /* We should already CoW the refcounted extent in case of create. */
547 BUG_ON(create && (ext_flags & OCFS2_EXT_REFCOUNTED));
548
Joseph Qi49255dc2015-02-16 16:00:03 -0800549 /* allocate blocks if no p_blkno is found, and create == 1 */
550 if (!p_blkno && create) {
551 ret = ocfs2_inode_lock(inode, NULL, 1);
552 if (ret < 0) {
553 mlog_errno(ret);
554 goto bail;
555 }
556
557 alloc_locked = 1;
558
559 /* fill hole, allocate blocks can't be larger than the size
560 * of the hole */
561 clusters_to_alloc = ocfs2_clusters_for_bytes(inode->i_sb, len);
562 if (clusters_to_alloc > contig_blocks)
563 clusters_to_alloc = contig_blocks;
564
565 /* allocate extent and insert them into the extent tree */
566 ret = ocfs2_extend_allocation(inode, cpos,
567 clusters_to_alloc, 0);
568 if (ret < 0) {
569 mlog_errno(ret);
570 goto bail;
571 }
572
573 ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno,
574 &contig_blocks, &ext_flags);
575 if (ret < 0) {
576 mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n",
577 (unsigned long long)iblock);
578 ret = -EIO;
579 goto bail;
580 }
581 }
582
Mark Fasheh25baf2da2007-02-14 15:30:30 -0800583 /*
584 * get_more_blocks() expects us to describe a hole by clearing
585 * the mapped bit on bh_result().
Mark Fasheh49cb8d22007-03-09 16:21:46 -0800586 *
587 * Consider an unwritten extent as a hole.
Mark Fasheh25baf2da2007-02-14 15:30:30 -0800588 */
Mark Fasheh49cb8d22007-03-09 16:21:46 -0800589 if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN))
Mark Fasheh25baf2da2007-02-14 15:30:30 -0800590 map_bh(bh_result, inode->i_sb, p_blkno);
Christoph Hellwig5fe878ae2009-12-15 16:47:50 -0800591 else
Mark Fasheh25baf2da2007-02-14 15:30:30 -0800592 clear_buffer_mapped(bh_result);
Mark Fashehccd979b2005-12-15 14:31:24 -0800593
594 /* make sure we don't map more than max_blocks blocks here as
595 that's all the kernel will handle at this point. */
596 if (max_blocks < contig_blocks)
597 contig_blocks = max_blocks;
598 bh_result->b_size = contig_blocks << blocksize_bits;
599bail:
Joseph Qi49255dc2015-02-16 16:00:03 -0800600 if (alloc_locked)
601 ocfs2_inode_unlock(inode, 1);
Mark Fashehccd979b2005-12-15 14:31:24 -0800602 return ret;
603}
604
Sunil Mushran2bd63212010-01-25 16:57:38 -0800605/*
Mark Fashehccd979b2005-12-15 14:31:24 -0800606 * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're
Christoph Hellwigbd5fe6c2011-06-24 14:29:43 -0400607 * particularly interested in the aio/dio case. We use the rw_lock DLM lock
608 * to protect io on one node from truncation on another.
Mark Fashehccd979b2005-12-15 14:31:24 -0800609 */
610static void ocfs2_dio_end_io(struct kiocb *iocb,
611 loff_t offset,
612 ssize_t bytes,
Christoph Hellwig7b7a8662013-09-04 15:04:39 +0200613 void *private)
Mark Fashehccd979b2005-12-15 14:31:24 -0800614{
Al Viro496ad9a2013-01-23 17:07:38 -0500615 struct inode *inode = file_inode(iocb->ki_filp);
Mark Fasheh7cdfc3a2007-04-16 17:28:51 -0700616 int level;
Mark Fashehccd979b2005-12-15 14:31:24 -0800617
618 /* this io's submitter should not have unlocked this before we could */
619 BUG_ON(!ocfs2_iocb_is_rw_locked(iocb));
Mark Fasheh7cdfc3a2007-04-16 17:28:51 -0700620
Christoph Hellwigdf2d6f22011-06-24 14:29:46 -0400621 if (ocfs2_iocb_is_sem_locked(iocb))
Tristan Ye39c99f12010-12-07 14:35:07 +0800622 ocfs2_iocb_clear_sem_locked(iocb);
Tristan Ye39c99f12010-12-07 14:35:07 +0800623
Mark Fasheha11f7e62011-06-22 14:23:38 -0700624 if (ocfs2_iocb_is_unaligned_aio(iocb)) {
625 ocfs2_iocb_clear_unaligned_aio(iocb);
626
Wengang Wangc18ceab2014-04-03 14:46:46 -0700627 mutex_unlock(&OCFS2_I(inode)->ip_unaligned_aio);
Mark Fasheha11f7e62011-06-22 14:23:38 -0700628 }
629
Mark Fashehccd979b2005-12-15 14:31:24 -0800630 ocfs2_iocb_clear_rw_locked(iocb);
Mark Fasheh7cdfc3a2007-04-16 17:28:51 -0700631
632 level = ocfs2_iocb_rw_locked_level(iocb);
Mark Fasheh7cdfc3a2007-04-16 17:28:51 -0700633 ocfs2_rw_unlock(inode, level);
Mark Fashehccd979b2005-12-15 14:31:24 -0800634}
635
Joel Becker03f981c2007-01-04 14:54:41 -0800636static int ocfs2_releasepage(struct page *page, gfp_t wait)
637{
Joel Becker03f981c2007-01-04 14:54:41 -0800638 if (!page_has_buffers(page))
639 return 0;
Jan Kara41ecc342013-11-12 15:07:08 -0800640 return try_to_free_buffers(page);
Joel Becker03f981c2007-01-04 14:54:41 -0800641}
642
Joseph Qi24c40b32015-02-16 16:00:00 -0800643static int ocfs2_is_overwrite(struct ocfs2_super *osb,
644 struct inode *inode, loff_t offset)
645{
646 int ret = 0;
647 u32 v_cpos = 0;
648 u32 p_cpos = 0;
649 unsigned int num_clusters = 0;
650 unsigned int ext_flags = 0;
651
652 v_cpos = ocfs2_bytes_to_clusters(osb->sb, offset);
653 ret = ocfs2_get_clusters(inode, v_cpos, &p_cpos,
654 &num_clusters, &ext_flags);
655 if (ret < 0) {
656 mlog_errno(ret);
657 return ret;
658 }
659
660 if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN))
661 return 1;
662
663 return 0;
664}
665
666static ssize_t ocfs2_direct_IO_write(struct kiocb *iocb,
667 struct iov_iter *iter,
668 loff_t offset)
669{
670 ssize_t ret = 0;
671 ssize_t written = 0;
672 bool orphaned = false;
673 int is_overwrite = 0;
674 struct file *file = iocb->ki_filp;
675 struct inode *inode = file_inode(file)->i_mapping->host;
676 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
677 struct buffer_head *di_bh = NULL;
678 size_t count = iter->count;
679 journal_t *journal = osb->journal->j_journal;
680 u32 zero_len;
681 int cluster_align;
682 loff_t final_size = offset + count;
683 int append_write = offset >= i_size_read(inode) ? 1 : 0;
684 unsigned int num_clusters = 0;
685 unsigned int ext_flags = 0;
686
687 {
688 u64 o = offset;
689
690 zero_len = do_div(o, 1 << osb->s_clustersize_bits);
691 cluster_align = !zero_len;
692 }
693
694 /*
695 * when final_size > inode->i_size, inode->i_size will be
696 * updated after direct write, so add the inode to orphan
697 * dir first.
698 */
699 if (final_size > i_size_read(inode)) {
700 ret = ocfs2_add_inode_to_orphan(osb, inode);
701 if (ret < 0) {
702 mlog_errno(ret);
703 goto out;
704 }
705 orphaned = true;
706 }
707
708 if (append_write) {
709 ret = ocfs2_inode_lock(inode, &di_bh, 1);
710 if (ret < 0) {
711 mlog_errno(ret);
712 goto clean_orphan;
713 }
714
715 if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
716 ret = ocfs2_zero_extend(inode, di_bh, offset);
717 else
718 ret = ocfs2_extend_no_holes(inode, di_bh, offset,
719 offset);
720 if (ret < 0) {
721 mlog_errno(ret);
722 ocfs2_inode_unlock(inode, 1);
723 brelse(di_bh);
724 goto clean_orphan;
725 }
726
727 is_overwrite = ocfs2_is_overwrite(osb, inode, offset);
728 if (is_overwrite < 0) {
729 mlog_errno(is_overwrite);
730 ocfs2_inode_unlock(inode, 1);
731 brelse(di_bh);
732 goto clean_orphan;
733 }
734
735 ocfs2_inode_unlock(inode, 1);
736 brelse(di_bh);
737 di_bh = NULL;
738 }
739
740 written = __blockdev_direct_IO(WRITE, iocb, inode, inode->i_sb->s_bdev,
741 iter, offset,
742 ocfs2_direct_IO_get_blocks,
743 ocfs2_dio_end_io, NULL, 0);
744 if (unlikely(written < 0)) {
745 loff_t i_size = i_size_read(inode);
746
747 if (offset + count > i_size) {
748 ret = ocfs2_inode_lock(inode, &di_bh, 1);
749 if (ret < 0) {
750 mlog_errno(ret);
751 goto clean_orphan;
752 }
753
754 if (i_size == i_size_read(inode)) {
755 ret = ocfs2_truncate_file(inode, di_bh,
756 i_size);
757 if (ret < 0) {
758 if (ret != -ENOSPC)
759 mlog_errno(ret);
760
761 ocfs2_inode_unlock(inode, 1);
762 brelse(di_bh);
763 goto clean_orphan;
764 }
765 }
766
767 ocfs2_inode_unlock(inode, 1);
768 brelse(di_bh);
769
770 ret = jbd2_journal_force_commit(journal);
771 if (ret < 0)
772 mlog_errno(ret);
773 }
774 } else if (written < 0 && append_write && !is_overwrite &&
775 !cluster_align) {
776 u32 p_cpos = 0;
777 u32 v_cpos = ocfs2_bytes_to_clusters(osb->sb, offset);
778
779 ret = ocfs2_get_clusters(inode, v_cpos, &p_cpos,
780 &num_clusters, &ext_flags);
781 if (ret < 0) {
782 mlog_errno(ret);
783 goto clean_orphan;
784 }
785
786 BUG_ON(!p_cpos || (ext_flags & OCFS2_EXT_UNWRITTEN));
787
788 ret = blkdev_issue_zeroout(osb->sb->s_bdev,
789 p_cpos << (osb->s_clustersize_bits - 9),
790 zero_len >> 9, GFP_KERNEL, false);
791 if (ret < 0)
792 mlog_errno(ret);
793 }
794
795clean_orphan:
796 if (orphaned) {
797 int tmp_ret;
798 int update_isize = written > 0 ? 1 : 0;
799 loff_t end = update_isize ? offset + written : 0;
800
801 tmp_ret = ocfs2_del_inode_from_orphan(osb, inode,
802 update_isize, end);
803 if (tmp_ret < 0) {
804 ret = tmp_ret;
805 goto out;
806 }
807
808 tmp_ret = jbd2_journal_force_commit(journal);
809 if (tmp_ret < 0) {
810 ret = tmp_ret;
811 mlog_errno(tmp_ret);
812 }
813 }
814
815out:
816 if (ret >= 0)
817 ret = written;
818 return ret;
819}
820
Mark Fashehccd979b2005-12-15 14:31:24 -0800821static ssize_t ocfs2_direct_IO(int rw,
822 struct kiocb *iocb,
Al Virod8d3d942014-03-04 21:27:34 -0500823 struct iov_iter *iter,
824 loff_t offset)
Mark Fashehccd979b2005-12-15 14:31:24 -0800825{
826 struct file *file = iocb->ki_filp;
Al Viro496ad9a2013-01-23 17:07:38 -0500827 struct inode *inode = file_inode(file)->i_mapping->host;
Joseph Qi24c40b32015-02-16 16:00:00 -0800828 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
829 int full_coherency = !(osb->s_mount_opt &
830 OCFS2_MOUNT_COHERENCY_BUFFERED);
Mark Fasheh53013cb2006-05-05 19:04:03 -0700831
Mark Fasheh6798d352007-09-07 14:05:51 -0700832 /*
833 * Fallback to buffered I/O if we see an inode without
834 * extents.
835 */
836 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
837 return 0;
838
Joseph Qi24c40b32015-02-16 16:00:00 -0800839 /* Fallback to buffered I/O if we are appending and
840 * concurrent O_DIRECT writes are allowed.
841 */
842 if (i_size_read(inode) <= offset && !full_coherency)
Tao Mab80474b2009-09-10 15:28:47 +0800843 return 0;
844
Joseph Qi24c40b32015-02-16 16:00:00 -0800845 if (rw == READ)
846 return __blockdev_direct_IO(rw, iocb, inode,
847 inode->i_sb->s_bdev,
Al Viro31b14032014-03-05 01:33:16 -0500848 iter, offset,
Tao Mac1e8d352011-03-07 16:43:21 +0800849 ocfs2_direct_IO_get_blocks,
850 ocfs2_dio_end_io, NULL, 0);
Joseph Qi24c40b32015-02-16 16:00:00 -0800851 else
852 return ocfs2_direct_IO_write(iocb, iter, offset);
Mark Fashehccd979b2005-12-15 14:31:24 -0800853}
854
Mark Fasheh9517bac2007-02-09 20:24:12 -0800855static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb,
856 u32 cpos,
857 unsigned int *start,
858 unsigned int *end)
859{
860 unsigned int cluster_start = 0, cluster_end = PAGE_CACHE_SIZE;
861
862 if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) {
863 unsigned int cpp;
864
865 cpp = 1 << (PAGE_CACHE_SHIFT - osb->s_clustersize_bits);
866
867 cluster_start = cpos % cpp;
868 cluster_start = cluster_start << osb->s_clustersize_bits;
869
870 cluster_end = cluster_start + osb->s_clustersize;
871 }
872
873 BUG_ON(cluster_start > PAGE_SIZE);
874 BUG_ON(cluster_end > PAGE_SIZE);
875
876 if (start)
877 *start = cluster_start;
878 if (end)
879 *end = cluster_end;
880}
881
882/*
883 * 'from' and 'to' are the region in the page to avoid zeroing.
884 *
885 * If pagesize > clustersize, this function will avoid zeroing outside
886 * of the cluster boundary.
887 *
888 * from == to == 0 is code for "zero the entire cluster region"
889 */
890static void ocfs2_clear_page_regions(struct page *page,
891 struct ocfs2_super *osb, u32 cpos,
892 unsigned from, unsigned to)
893{
894 void *kaddr;
895 unsigned int cluster_start, cluster_end;
896
897 ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end);
898
Cong Wangc4bc8dc2011-11-25 23:14:34 +0800899 kaddr = kmap_atomic(page);
Mark Fasheh9517bac2007-02-09 20:24:12 -0800900
901 if (from || to) {
902 if (from > cluster_start)
903 memset(kaddr + cluster_start, 0, from - cluster_start);
904 if (to < cluster_end)
905 memset(kaddr + to, 0, cluster_end - to);
906 } else {
907 memset(kaddr + cluster_start, 0, cluster_end - cluster_start);
908 }
909
Cong Wangc4bc8dc2011-11-25 23:14:34 +0800910 kunmap_atomic(kaddr);
Mark Fasheh9517bac2007-02-09 20:24:12 -0800911}
912
913/*
Mark Fasheh4e9563f2007-11-01 11:37:48 -0700914 * Nonsparse file systems fully allocate before we get to the write
915 * code. This prevents ocfs2_write() from tagging the write as an
916 * allocating one, which means ocfs2_map_page_blocks() might try to
917 * read-in the blocks at the tail of our file. Avoid reading them by
918 * testing i_size against each block offset.
919 */
920static int ocfs2_should_read_blk(struct inode *inode, struct page *page,
921 unsigned int block_start)
922{
923 u64 offset = page_offset(page) + block_start;
924
925 if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
926 return 1;
927
928 if (i_size_read(inode) > offset)
929 return 1;
930
931 return 0;
932}
933
934/*
Christoph Hellwigebdec242010-10-06 10:47:23 +0200935 * Some of this taken from __block_write_begin(). We already have our
Mark Fasheh9517bac2007-02-09 20:24:12 -0800936 * mapping by now though, and the entire write will be allocating or
937 * it won't, so not much need to use BH_New.
938 *
939 * This will also skip zeroing, which is handled externally.
940 */
Mark Fasheh60b11392007-02-16 11:46:50 -0800941int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
942 struct inode *inode, unsigned int from,
943 unsigned int to, int new)
Mark Fasheh9517bac2007-02-09 20:24:12 -0800944{
945 int ret = 0;
946 struct buffer_head *head, *bh, *wait[2], **wait_bh = wait;
947 unsigned int block_end, block_start;
948 unsigned int bsize = 1 << inode->i_blkbits;
949
950 if (!page_has_buffers(page))
951 create_empty_buffers(page, bsize, 0);
952
953 head = page_buffers(page);
954 for (bh = head, block_start = 0; bh != head || !block_start;
955 bh = bh->b_this_page, block_start += bsize) {
956 block_end = block_start + bsize;
957
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700958 clear_buffer_new(bh);
959
Mark Fasheh9517bac2007-02-09 20:24:12 -0800960 /*
961 * Ignore blocks outside of our i/o range -
962 * they may belong to unallocated clusters.
963 */
Mark Fasheh60b11392007-02-16 11:46:50 -0800964 if (block_start >= to || block_end <= from) {
Mark Fasheh9517bac2007-02-09 20:24:12 -0800965 if (PageUptodate(page))
966 set_buffer_uptodate(bh);
967 continue;
968 }
969
970 /*
971 * For an allocating write with cluster size >= page
972 * size, we always write the entire page.
973 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700974 if (new)
975 set_buffer_new(bh);
Mark Fasheh9517bac2007-02-09 20:24:12 -0800976
977 if (!buffer_mapped(bh)) {
978 map_bh(bh, inode->i_sb, *p_blkno);
979 unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
980 }
981
982 if (PageUptodate(page)) {
983 if (!buffer_uptodate(bh))
984 set_buffer_uptodate(bh);
985 } else if (!buffer_uptodate(bh) && !buffer_delay(bh) &&
Mark Fashehbce99762007-06-18 11:12:36 -0700986 !buffer_new(bh) &&
Mark Fasheh4e9563f2007-11-01 11:37:48 -0700987 ocfs2_should_read_blk(inode, page, block_start) &&
Mark Fashehbce99762007-06-18 11:12:36 -0700988 (block_start < from || block_end > to)) {
Mark Fasheh9517bac2007-02-09 20:24:12 -0800989 ll_rw_block(READ, 1, &bh);
990 *wait_bh++=bh;
991 }
992
993 *p_blkno = *p_blkno + 1;
994 }
995
996 /*
997 * If we issued read requests - let them complete.
998 */
999 while(wait_bh > wait) {
1000 wait_on_buffer(*--wait_bh);
1001 if (!buffer_uptodate(*wait_bh))
1002 ret = -EIO;
1003 }
1004
1005 if (ret == 0 || !new)
1006 return ret;
1007
1008 /*
1009 * If we get -EIO above, zero out any newly allocated blocks
1010 * to avoid exposing stale data.
1011 */
1012 bh = head;
1013 block_start = 0;
1014 do {
Mark Fasheh9517bac2007-02-09 20:24:12 -08001015 block_end = block_start + bsize;
1016 if (block_end <= from)
1017 goto next_bh;
1018 if (block_start >= to)
1019 break;
1020
Christoph Lametereebd2aa2008-02-04 22:28:29 -08001021 zero_user(page, block_start, bh->b_size);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001022 set_buffer_uptodate(bh);
1023 mark_buffer_dirty(bh);
1024
1025next_bh:
1026 block_start = block_end;
1027 bh = bh->b_this_page;
1028 } while (bh != head);
1029
1030 return ret;
1031}
1032
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001033#if (PAGE_CACHE_SIZE >= OCFS2_MAX_CLUSTERSIZE)
1034#define OCFS2_MAX_CTXT_PAGES 1
1035#else
1036#define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_CACHE_SIZE)
1037#endif
Mark Fasheh6af67d82007-03-06 17:24:46 -08001038
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001039#define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_CACHE_SIZE / OCFS2_MIN_CLUSTERSIZE)
Mark Fasheh6af67d82007-03-06 17:24:46 -08001040
1041/*
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001042 * Describe the state of a single cluster to be written to.
Mark Fasheh9517bac2007-02-09 20:24:12 -08001043 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001044struct ocfs2_write_cluster_desc {
1045 u32 c_cpos;
1046 u32 c_phys;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001047 /*
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001048 * Give this a unique field because c_phys eventually gets
1049 * filled.
Mark Fasheh9517bac2007-02-09 20:24:12 -08001050 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001051 unsigned c_new;
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001052 unsigned c_unwritten;
Sunil Mushrane7432672009-08-06 16:12:58 -07001053 unsigned c_needs_zero;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001054};
Mark Fasheh9517bac2007-02-09 20:24:12 -08001055
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001056struct ocfs2_write_ctxt {
1057 /* Logical cluster position / len of write */
1058 u32 w_cpos;
1059 u32 w_clen;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001060
Sunil Mushrane7432672009-08-06 16:12:58 -07001061 /* First cluster allocated in a nonsparse extend */
1062 u32 w_first_new_cpos;
1063
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001064 struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE];
Mark Fasheh9517bac2007-02-09 20:24:12 -08001065
1066 /*
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001067 * This is true if page_size > cluster_size.
Mark Fasheh9517bac2007-02-09 20:24:12 -08001068 *
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001069 * It triggers a set of special cases during write which might
1070 * have to deal with allocating writes to partial pages.
Mark Fasheh9517bac2007-02-09 20:24:12 -08001071 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001072 unsigned int w_large_pages;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001073
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001074 /*
1075 * Pages involved in this write.
1076 *
1077 * w_target_page is the page being written to by the user.
1078 *
1079 * w_pages is an array of pages which always contains
1080 * w_target_page, and in the case of an allocating write with
1081 * page_size < cluster size, it will contain zero'd and mapped
1082 * pages adjacent to w_target_page which need to be written
1083 * out in so that future reads from that region will get
1084 * zero's.
1085 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001086 unsigned int w_num_pages;
Goldwyn Rodrigues83fd9c72010-06-10 17:21:36 -05001087 struct page *w_pages[OCFS2_MAX_CTXT_PAGES];
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001088 struct page *w_target_page;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001089
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001090 /*
Wengang Wang5cffff92011-07-24 10:36:54 -07001091 * w_target_locked is used for page_mkwrite path indicating no unlocking
1092 * against w_target_page in ocfs2_write_end_nolock.
1093 */
1094 unsigned int w_target_locked:1;
1095
1096 /*
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001097 * ocfs2_write_end() uses this to know what the real range to
1098 * write in the target should be.
1099 */
1100 unsigned int w_target_from;
1101 unsigned int w_target_to;
1102
1103 /*
1104 * We could use journal_current_handle() but this is cleaner,
1105 * IMHO -Mark
1106 */
1107 handle_t *w_handle;
1108
1109 struct buffer_head *w_di_bh;
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001110
1111 struct ocfs2_cached_dealloc_ctxt w_dealloc;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001112};
1113
Mark Fasheh1d410a62007-09-07 14:20:45 -07001114void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages)
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001115{
1116 int i;
1117
Mark Fasheh1d410a62007-09-07 14:20:45 -07001118 for(i = 0; i < num_pages; i++) {
1119 if (pages[i]) {
1120 unlock_page(pages[i]);
1121 mark_page_accessed(pages[i]);
1122 page_cache_release(pages[i]);
1123 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001124 }
Mark Fasheh1d410a62007-09-07 14:20:45 -07001125}
1126
Junxiao Bi136f49b2014-12-18 16:17:37 -08001127static void ocfs2_unlock_pages(struct ocfs2_write_ctxt *wc)
Mark Fasheh1d410a62007-09-07 14:20:45 -07001128{
Wengang Wang5cffff92011-07-24 10:36:54 -07001129 int i;
1130
1131 /*
1132 * w_target_locked is only set to true in the page_mkwrite() case.
1133 * The intent is to allow us to lock the target page from write_begin()
1134 * to write_end(). The caller must hold a ref on w_target_page.
1135 */
1136 if (wc->w_target_locked) {
1137 BUG_ON(!wc->w_target_page);
1138 for (i = 0; i < wc->w_num_pages; i++) {
1139 if (wc->w_target_page == wc->w_pages[i]) {
1140 wc->w_pages[i] = NULL;
1141 break;
1142 }
1143 }
1144 mark_page_accessed(wc->w_target_page);
1145 page_cache_release(wc->w_target_page);
1146 }
Mark Fasheh1d410a62007-09-07 14:20:45 -07001147 ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages);
Junxiao Bi136f49b2014-12-18 16:17:37 -08001148}
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001149
Junxiao Bi136f49b2014-12-18 16:17:37 -08001150static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt *wc)
1151{
1152 ocfs2_unlock_pages(wc);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001153 brelse(wc->w_di_bh);
1154 kfree(wc);
1155}
1156
1157static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp,
1158 struct ocfs2_super *osb, loff_t pos,
Mark Fasheh607d44a2007-05-09 15:14:45 -07001159 unsigned len, struct buffer_head *di_bh)
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001160{
tao.ma@oracle.com30b85482007-09-06 08:02:25 +08001161 u32 cend;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001162 struct ocfs2_write_ctxt *wc;
1163
1164 wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS);
1165 if (!wc)
1166 return -ENOMEM;
1167
1168 wc->w_cpos = pos >> osb->s_clustersize_bits;
Sunil Mushrane7432672009-08-06 16:12:58 -07001169 wc->w_first_new_cpos = UINT_MAX;
tao.ma@oracle.com30b85482007-09-06 08:02:25 +08001170 cend = (pos + len - 1) >> osb->s_clustersize_bits;
1171 wc->w_clen = cend - wc->w_cpos + 1;
Mark Fasheh607d44a2007-05-09 15:14:45 -07001172 get_bh(di_bh);
1173 wc->w_di_bh = di_bh;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001174
1175 if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits))
1176 wc->w_large_pages = 1;
1177 else
1178 wc->w_large_pages = 0;
1179
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001180 ocfs2_init_dealloc_ctxt(&wc->w_dealloc);
1181
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001182 *wcp = wc;
1183
1184 return 0;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001185}
1186
1187/*
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001188 * If a page has any new buffers, zero them out here, and mark them uptodate
1189 * and dirty so they'll be written out (in order to prevent uninitialised
1190 * block data from leaking). And clear the new bit.
Mark Fasheh9517bac2007-02-09 20:24:12 -08001191 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001192static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to)
Mark Fasheh9517bac2007-02-09 20:24:12 -08001193{
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001194 unsigned int block_start, block_end;
1195 struct buffer_head *head, *bh;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001196
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001197 BUG_ON(!PageLocked(page));
1198 if (!page_has_buffers(page))
1199 return;
1200
1201 bh = head = page_buffers(page);
1202 block_start = 0;
1203 do {
1204 block_end = block_start + bh->b_size;
1205
1206 if (buffer_new(bh)) {
1207 if (block_end > from && block_start < to) {
1208 if (!PageUptodate(page)) {
1209 unsigned start, end;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001210
1211 start = max(from, block_start);
1212 end = min(to, block_end);
1213
Christoph Lametereebd2aa2008-02-04 22:28:29 -08001214 zero_user_segment(page, start, end);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001215 set_buffer_uptodate(bh);
1216 }
1217
1218 clear_buffer_new(bh);
1219 mark_buffer_dirty(bh);
1220 }
1221 }
1222
1223 block_start = block_end;
1224 bh = bh->b_this_page;
1225 } while (bh != head);
1226}
1227
1228/*
1229 * Only called when we have a failure during allocating write to write
1230 * zero's to the newly allocated region.
1231 */
1232static void ocfs2_write_failure(struct inode *inode,
1233 struct ocfs2_write_ctxt *wc,
1234 loff_t user_pos, unsigned user_len)
1235{
1236 int i;
Mark Fasheh5c26a7b2007-09-18 17:49:29 -07001237 unsigned from = user_pos & (PAGE_CACHE_SIZE - 1),
1238 to = user_pos + user_len;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001239 struct page *tmppage;
1240
Mark Fasheh5c26a7b2007-09-18 17:49:29 -07001241 ocfs2_zero_new_buffers(wc->w_target_page, from, to);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001242
1243 for(i = 0; i < wc->w_num_pages; i++) {
1244 tmppage = wc->w_pages[i];
1245
Sunil Mushran961cecb2008-07-16 17:22:22 -07001246 if (page_has_buffers(tmppage)) {
Mark Fasheh53ef99c2008-11-18 16:53:43 -08001247 if (ocfs2_should_order_data(inode))
Joel Becker2b4e30f2008-09-03 20:03:41 -07001248 ocfs2_jbd2_file_inode(wc->w_handle, inode);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001249
Sunil Mushran961cecb2008-07-16 17:22:22 -07001250 block_commit_write(tmppage, from, to);
1251 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001252 }
1253}
1254
1255static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno,
1256 struct ocfs2_write_ctxt *wc,
1257 struct page *page, u32 cpos,
1258 loff_t user_pos, unsigned user_len,
1259 int new)
1260{
1261 int ret;
1262 unsigned int map_from = 0, map_to = 0;
1263 unsigned int cluster_start, cluster_end;
1264 unsigned int user_data_from = 0, user_data_to = 0;
1265
1266 ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos,
Mark Fasheh9517bac2007-02-09 20:24:12 -08001267 &cluster_start, &cluster_end);
1268
Goldwyn Rodrigues272b62c2011-02-17 09:44:40 -06001269 /* treat the write as new if the a hole/lseek spanned across
1270 * the page boundary.
1271 */
1272 new = new | ((i_size_read(inode) <= page_offset(page)) &&
1273 (page_offset(page) <= user_pos));
1274
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001275 if (page == wc->w_target_page) {
1276 map_from = user_pos & (PAGE_CACHE_SIZE - 1);
1277 map_to = map_from + user_len;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001278
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001279 if (new)
1280 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
1281 cluster_start, cluster_end,
1282 new);
1283 else
1284 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
1285 map_from, map_to, new);
1286 if (ret) {
Mark Fasheh9517bac2007-02-09 20:24:12 -08001287 mlog_errno(ret);
1288 goto out;
1289 }
1290
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001291 user_data_from = map_from;
1292 user_data_to = map_to;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001293 if (new) {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001294 map_from = cluster_start;
1295 map_to = cluster_end;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001296 }
1297 } else {
1298 /*
1299 * If we haven't allocated the new page yet, we
1300 * shouldn't be writing it out without copying user
1301 * data. This is likely a math error from the caller.
1302 */
1303 BUG_ON(!new);
1304
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001305 map_from = cluster_start;
1306 map_to = cluster_end;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001307
1308 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001309 cluster_start, cluster_end, new);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001310 if (ret) {
1311 mlog_errno(ret);
1312 goto out;
1313 }
1314 }
1315
1316 /*
1317 * Parts of newly allocated pages need to be zero'd.
1318 *
1319 * Above, we have also rewritten 'to' and 'from' - as far as
1320 * the rest of the function is concerned, the entire cluster
1321 * range inside of a page needs to be written.
1322 *
1323 * We can skip this if the page is up to date - it's already
1324 * been zero'd from being read in as a hole.
1325 */
1326 if (new && !PageUptodate(page))
1327 ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb),
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001328 cpos, user_data_from, user_data_to);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001329
1330 flush_dcache_page(page);
1331
Mark Fasheh9517bac2007-02-09 20:24:12 -08001332out:
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001333 return ret;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001334}
1335
1336/*
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001337 * This function will only grab one clusters worth of pages.
Mark Fasheh9517bac2007-02-09 20:24:12 -08001338 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001339static int ocfs2_grab_pages_for_write(struct address_space *mapping,
1340 struct ocfs2_write_ctxt *wc,
Joel Becker693c2412010-07-02 17:20:27 -07001341 u32 cpos, loff_t user_pos,
1342 unsigned user_len, int new,
Mark Fasheh7307de82007-05-09 15:16:19 -07001343 struct page *mmap_page)
Mark Fasheh9517bac2007-02-09 20:24:12 -08001344{
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001345 int ret = 0, i;
Joel Becker693c2412010-07-02 17:20:27 -07001346 unsigned long start, target_index, end_index, index;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001347 struct inode *inode = mapping->host;
Joel Becker693c2412010-07-02 17:20:27 -07001348 loff_t last_byte;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001349
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001350 target_index = user_pos >> PAGE_CACHE_SHIFT;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001351
1352 /*
1353 * Figure out how many pages we'll be manipulating here. For
Mark Fasheh60b11392007-02-16 11:46:50 -08001354 * non allocating write, we just change the one
Joel Becker693c2412010-07-02 17:20:27 -07001355 * page. Otherwise, we'll need a whole clusters worth. If we're
1356 * writing past i_size, we only need enough pages to cover the
1357 * last page of the write.
Mark Fasheh9517bac2007-02-09 20:24:12 -08001358 */
Mark Fasheh9517bac2007-02-09 20:24:12 -08001359 if (new) {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001360 wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb);
1361 start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos);
Joel Becker693c2412010-07-02 17:20:27 -07001362 /*
1363 * We need the index *past* the last page we could possibly
1364 * touch. This is the page past the end of the write or
1365 * i_size, whichever is greater.
1366 */
1367 last_byte = max(user_pos + user_len, i_size_read(inode));
1368 BUG_ON(last_byte < 1);
1369 end_index = ((last_byte - 1) >> PAGE_CACHE_SHIFT) + 1;
1370 if ((start + wc->w_num_pages) > end_index)
1371 wc->w_num_pages = end_index - start;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001372 } else {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001373 wc->w_num_pages = 1;
1374 start = target_index;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001375 }
1376
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001377 for(i = 0; i < wc->w_num_pages; i++) {
Mark Fasheh9517bac2007-02-09 20:24:12 -08001378 index = start + i;
1379
Mark Fasheh7307de82007-05-09 15:16:19 -07001380 if (index == target_index && mmap_page) {
1381 /*
1382 * ocfs2_pagemkwrite() is a little different
1383 * and wants us to directly use the page
1384 * passed in.
1385 */
1386 lock_page(mmap_page);
1387
Wengang Wang5cffff92011-07-24 10:36:54 -07001388 /* Exit and let the caller retry */
Mark Fasheh7307de82007-05-09 15:16:19 -07001389 if (mmap_page->mapping != mapping) {
Wengang Wang5cffff92011-07-24 10:36:54 -07001390 WARN_ON(mmap_page->mapping);
Mark Fasheh7307de82007-05-09 15:16:19 -07001391 unlock_page(mmap_page);
Wengang Wang5cffff92011-07-24 10:36:54 -07001392 ret = -EAGAIN;
Mark Fasheh7307de82007-05-09 15:16:19 -07001393 goto out;
1394 }
1395
1396 page_cache_get(mmap_page);
1397 wc->w_pages[i] = mmap_page;
Wengang Wang5cffff92011-07-24 10:36:54 -07001398 wc->w_target_locked = true;
Mark Fasheh7307de82007-05-09 15:16:19 -07001399 } else {
1400 wc->w_pages[i] = find_or_create_page(mapping, index,
1401 GFP_NOFS);
1402 if (!wc->w_pages[i]) {
1403 ret = -ENOMEM;
1404 mlog_errno(ret);
1405 goto out;
1406 }
Mark Fasheh9517bac2007-02-09 20:24:12 -08001407 }
Jan Kara12695292013-02-21 16:42:57 -08001408 wait_for_stable_page(wc->w_pages[i]);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001409
1410 if (index == target_index)
1411 wc->w_target_page = wc->w_pages[i];
Mark Fasheh9517bac2007-02-09 20:24:12 -08001412 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001413out:
Wengang Wang5cffff92011-07-24 10:36:54 -07001414 if (ret)
1415 wc->w_target_locked = false;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001416 return ret;
1417}
1418
1419/*
1420 * Prepare a single cluster for write one cluster into the file.
1421 */
1422static int ocfs2_write_cluster(struct address_space *mapping,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001423 u32 phys, unsigned int unwritten,
Sunil Mushrane7432672009-08-06 16:12:58 -07001424 unsigned int should_zero,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001425 struct ocfs2_alloc_context *data_ac,
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001426 struct ocfs2_alloc_context *meta_ac,
1427 struct ocfs2_write_ctxt *wc, u32 cpos,
1428 loff_t user_pos, unsigned user_len)
1429{
Sunil Mushrane7432672009-08-06 16:12:58 -07001430 int ret, i, new;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001431 u64 v_blkno, p_blkno;
1432 struct inode *inode = mapping->host;
Joel Beckerf99b9b72008-08-20 19:36:33 -07001433 struct ocfs2_extent_tree et;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001434
1435 new = phys == 0 ? 1 : 0;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001436 if (new) {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001437 u32 tmp_pos;
1438
Mark Fasheh9517bac2007-02-09 20:24:12 -08001439 /*
1440 * This is safe to call with the page locks - it won't take
1441 * any additional semaphores or cluster locks.
1442 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001443 tmp_pos = cpos;
Tao Ma0eb8d472008-08-18 17:38:45 +08001444 ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode,
1445 &tmp_pos, 1, 0, wc->w_di_bh,
1446 wc->w_handle, data_ac,
1447 meta_ac, NULL);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001448 /*
1449 * This shouldn't happen because we must have already
1450 * calculated the correct meta data allocation required. The
1451 * internal tree allocation code should know how to increase
1452 * transaction credits itself.
1453 *
1454 * If need be, we could handle -EAGAIN for a
1455 * RESTART_TRANS here.
1456 */
1457 mlog_bug_on_msg(ret == -EAGAIN,
1458 "Inode %llu: EAGAIN return during allocation.\n",
1459 (unsigned long long)OCFS2_I(inode)->ip_blkno);
1460 if (ret < 0) {
1461 mlog_errno(ret);
1462 goto out;
1463 }
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001464 } else if (unwritten) {
Joel Becker5e404e92009-02-13 03:54:22 -08001465 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
1466 wc->w_di_bh);
Joel Beckerf99b9b72008-08-20 19:36:33 -07001467 ret = ocfs2_mark_extent_written(inode, &et,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001468 wc->w_handle, cpos, 1, phys,
Joel Beckerf99b9b72008-08-20 19:36:33 -07001469 meta_ac, &wc->w_dealloc);
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001470 if (ret < 0) {
1471 mlog_errno(ret);
1472 goto out;
1473 }
Mark Fasheh9517bac2007-02-09 20:24:12 -08001474 }
1475
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001476 if (should_zero)
1477 v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, cpos);
1478 else
1479 v_blkno = user_pos >> inode->i_sb->s_blocksize_bits;
1480
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001481 /*
1482 * The only reason this should fail is due to an inability to
1483 * find the extent added.
1484 */
Mark Fasheh49cb8d22007-03-09 16:21:46 -08001485 ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL,
1486 NULL);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001487 if (ret < 0) {
jiangyiwen61fb9ea2014-12-10 15:42:02 -08001488 mlog(ML_ERROR, "Get physical blkno failed for inode %llu, "
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001489 "at logical block %llu",
1490 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1491 (unsigned long long)v_blkno);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001492 goto out;
1493 }
1494
1495 BUG_ON(p_blkno == 0);
1496
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001497 for(i = 0; i < wc->w_num_pages; i++) {
1498 int tmpret;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001499
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001500 tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc,
1501 wc->w_pages[i], cpos,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001502 user_pos, user_len,
1503 should_zero);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001504 if (tmpret) {
1505 mlog_errno(tmpret);
1506 if (ret == 0)
Wengang Wangcbfa9632009-07-13 11:38:23 +08001507 ret = tmpret;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001508 }
Mark Fasheh9517bac2007-02-09 20:24:12 -08001509 }
1510
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001511 /*
1512 * We only have cleanup to do in case of allocating write.
1513 */
1514 if (ret && new)
1515 ocfs2_write_failure(inode, wc, user_pos, user_len);
1516
Mark Fasheh9517bac2007-02-09 20:24:12 -08001517out:
Mark Fasheh9517bac2007-02-09 20:24:12 -08001518
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001519 return ret;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001520}
1521
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001522static int ocfs2_write_cluster_by_desc(struct address_space *mapping,
1523 struct ocfs2_alloc_context *data_ac,
1524 struct ocfs2_alloc_context *meta_ac,
1525 struct ocfs2_write_ctxt *wc,
1526 loff_t pos, unsigned len)
1527{
1528 int ret, i;
Mark Fashehdb562462007-09-17 09:06:29 -07001529 loff_t cluster_off;
1530 unsigned int local_len = len;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001531 struct ocfs2_write_cluster_desc *desc;
Mark Fashehdb562462007-09-17 09:06:29 -07001532 struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb);
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001533
1534 for (i = 0; i < wc->w_clen; i++) {
1535 desc = &wc->w_desc[i];
1536
Mark Fashehdb562462007-09-17 09:06:29 -07001537 /*
1538 * We have to make sure that the total write passed in
1539 * doesn't extend past a single cluster.
1540 */
1541 local_len = len;
1542 cluster_off = pos & (osb->s_clustersize - 1);
1543 if ((cluster_off + local_len) > osb->s_clustersize)
1544 local_len = osb->s_clustersize - cluster_off;
1545
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001546 ret = ocfs2_write_cluster(mapping, desc->c_phys,
Sunil Mushrane7432672009-08-06 16:12:58 -07001547 desc->c_unwritten,
1548 desc->c_needs_zero,
1549 data_ac, meta_ac,
Mark Fashehdb562462007-09-17 09:06:29 -07001550 wc, desc->c_cpos, pos, local_len);
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001551 if (ret) {
1552 mlog_errno(ret);
1553 goto out;
1554 }
Mark Fashehdb562462007-09-17 09:06:29 -07001555
1556 len -= local_len;
1557 pos += local_len;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001558 }
1559
1560 ret = 0;
1561out:
1562 return ret;
1563}
1564
Mark Fasheh9517bac2007-02-09 20:24:12 -08001565/*
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001566 * ocfs2_write_end() wants to know which parts of the target page it
1567 * should complete the write on. It's easiest to compute them ahead of
1568 * time when a more complete view of the write is available.
Mark Fasheh9517bac2007-02-09 20:24:12 -08001569 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001570static void ocfs2_set_target_boundaries(struct ocfs2_super *osb,
1571 struct ocfs2_write_ctxt *wc,
1572 loff_t pos, unsigned len, int alloc)
Mark Fasheh9517bac2007-02-09 20:24:12 -08001573{
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001574 struct ocfs2_write_cluster_desc *desc;
1575
1576 wc->w_target_from = pos & (PAGE_CACHE_SIZE - 1);
1577 wc->w_target_to = wc->w_target_from + len;
1578
1579 if (alloc == 0)
1580 return;
1581
1582 /*
1583 * Allocating write - we may have different boundaries based
1584 * on page size and cluster size.
1585 *
1586 * NOTE: We can no longer compute one value from the other as
1587 * the actual write length and user provided length may be
1588 * different.
1589 */
1590
1591 if (wc->w_large_pages) {
1592 /*
1593 * We only care about the 1st and last cluster within
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001594 * our range and whether they should be zero'd or not. Either
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001595 * value may be extended out to the start/end of a
1596 * newly allocated cluster.
1597 */
1598 desc = &wc->w_desc[0];
Sunil Mushrane7432672009-08-06 16:12:58 -07001599 if (desc->c_needs_zero)
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001600 ocfs2_figure_cluster_boundaries(osb,
1601 desc->c_cpos,
1602 &wc->w_target_from,
1603 NULL);
1604
1605 desc = &wc->w_desc[wc->w_clen - 1];
Sunil Mushrane7432672009-08-06 16:12:58 -07001606 if (desc->c_needs_zero)
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001607 ocfs2_figure_cluster_boundaries(osb,
1608 desc->c_cpos,
1609 NULL,
1610 &wc->w_target_to);
1611 } else {
1612 wc->w_target_from = 0;
1613 wc->w_target_to = PAGE_CACHE_SIZE;
1614 }
1615}
1616
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001617/*
1618 * Populate each single-cluster write descriptor in the write context
1619 * with information about the i/o to be done.
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001620 *
1621 * Returns the number of clusters that will have to be allocated, as
1622 * well as a worst case estimate of the number of extent records that
1623 * would have to be created during a write to an unwritten region.
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001624 */
1625static int ocfs2_populate_write_desc(struct inode *inode,
1626 struct ocfs2_write_ctxt *wc,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001627 unsigned int *clusters_to_alloc,
1628 unsigned int *extents_to_split)
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001629{
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001630 int ret;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001631 struct ocfs2_write_cluster_desc *desc;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001632 unsigned int num_clusters = 0;
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001633 unsigned int ext_flags = 0;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001634 u32 phys = 0;
1635 int i;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001636
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001637 *clusters_to_alloc = 0;
1638 *extents_to_split = 0;
1639
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001640 for (i = 0; i < wc->w_clen; i++) {
1641 desc = &wc->w_desc[i];
1642 desc->c_cpos = wc->w_cpos + i;
1643
1644 if (num_clusters == 0) {
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001645 /*
1646 * Need to look up the next extent record.
1647 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001648 ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001649 &num_clusters, &ext_flags);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001650 if (ret) {
1651 mlog_errno(ret);
Mark Fasheh607d44a2007-05-09 15:14:45 -07001652 goto out;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001653 }
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001654
Tao Ma293b2f72009-08-25 08:02:48 +08001655 /* We should already CoW the refcountd extent. */
1656 BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1657
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001658 /*
1659 * Assume worst case - that we're writing in
1660 * the middle of the extent.
1661 *
1662 * We can assume that the write proceeds from
1663 * left to right, in which case the extent
1664 * insert code is smart enough to coalesce the
1665 * next splits into the previous records created.
1666 */
1667 if (ext_flags & OCFS2_EXT_UNWRITTEN)
1668 *extents_to_split = *extents_to_split + 2;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001669 } else if (phys) {
1670 /*
1671 * Only increment phys if it doesn't describe
1672 * a hole.
1673 */
1674 phys++;
1675 }
1676
Sunil Mushrane7432672009-08-06 16:12:58 -07001677 /*
1678 * If w_first_new_cpos is < UINT_MAX, we have a non-sparse
1679 * file that got extended. w_first_new_cpos tells us
1680 * where the newly allocated clusters are so we can
1681 * zero them.
1682 */
1683 if (desc->c_cpos >= wc->w_first_new_cpos) {
1684 BUG_ON(phys == 0);
1685 desc->c_needs_zero = 1;
1686 }
1687
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001688 desc->c_phys = phys;
1689 if (phys == 0) {
1690 desc->c_new = 1;
Sunil Mushrane7432672009-08-06 16:12:58 -07001691 desc->c_needs_zero = 1;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001692 *clusters_to_alloc = *clusters_to_alloc + 1;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001693 }
Sunil Mushrane7432672009-08-06 16:12:58 -07001694
1695 if (ext_flags & OCFS2_EXT_UNWRITTEN) {
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001696 desc->c_unwritten = 1;
Sunil Mushrane7432672009-08-06 16:12:58 -07001697 desc->c_needs_zero = 1;
1698 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001699
1700 num_clusters--;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001701 }
1702
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001703 ret = 0;
1704out:
1705 return ret;
1706}
1707
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001708static int ocfs2_write_begin_inline(struct address_space *mapping,
1709 struct inode *inode,
1710 struct ocfs2_write_ctxt *wc)
1711{
1712 int ret;
1713 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1714 struct page *page;
1715 handle_t *handle;
1716 struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1717
Junxiao Bif775da22014-10-09 15:25:15 -07001718 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1719 if (IS_ERR(handle)) {
1720 ret = PTR_ERR(handle);
1721 mlog_errno(ret);
1722 goto out;
1723 }
1724
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001725 page = find_or_create_page(mapping, 0, GFP_NOFS);
1726 if (!page) {
Junxiao Bif775da22014-10-09 15:25:15 -07001727 ocfs2_commit_trans(osb, handle);
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001728 ret = -ENOMEM;
1729 mlog_errno(ret);
1730 goto out;
1731 }
1732 /*
1733 * If we don't set w_num_pages then this page won't get unlocked
1734 * and freed on cleanup of the write context.
1735 */
1736 wc->w_pages[0] = wc->w_target_page = page;
1737 wc->w_num_pages = 1;
1738
Joel Becker0cf2f762009-02-12 16:41:25 -08001739 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
Joel Becker13723d02008-10-17 19:25:01 -07001740 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001741 if (ret) {
1742 ocfs2_commit_trans(osb, handle);
1743
1744 mlog_errno(ret);
1745 goto out;
1746 }
1747
1748 if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
1749 ocfs2_set_inode_data_inline(inode, di);
1750
1751 if (!PageUptodate(page)) {
1752 ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh);
1753 if (ret) {
1754 ocfs2_commit_trans(osb, handle);
1755
1756 goto out;
1757 }
1758 }
1759
1760 wc->w_handle = handle;
1761out:
1762 return ret;
1763}
1764
1765int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size)
1766{
1767 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1768
Mark Fasheh0d8a4e02007-11-20 11:48:41 -08001769 if (new_size <= le16_to_cpu(di->id2.i_data.id_count))
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001770 return 1;
1771 return 0;
1772}
1773
1774static int ocfs2_try_to_write_inline_data(struct address_space *mapping,
1775 struct inode *inode, loff_t pos,
1776 unsigned len, struct page *mmap_page,
1777 struct ocfs2_write_ctxt *wc)
1778{
1779 int ret, written = 0;
1780 loff_t end = pos + len;
1781 struct ocfs2_inode_info *oi = OCFS2_I(inode);
Tiger Yangd9ae49d2009-03-05 11:06:15 +08001782 struct ocfs2_dinode *di = NULL;
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001783
Tao Ma95581562011-02-22 21:33:59 +08001784 trace_ocfs2_try_to_write_inline_data((unsigned long long)oi->ip_blkno,
1785 len, (unsigned long long)pos,
1786 oi->ip_dyn_features);
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001787
1788 /*
1789 * Handle inodes which already have inline data 1st.
1790 */
1791 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1792 if (mmap_page == NULL &&
1793 ocfs2_size_fits_inline_data(wc->w_di_bh, end))
1794 goto do_inline_write;
1795
1796 /*
1797 * The write won't fit - we have to give this inode an
1798 * inline extent list now.
1799 */
1800 ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh);
1801 if (ret)
1802 mlog_errno(ret);
1803 goto out;
1804 }
1805
1806 /*
1807 * Check whether the inode can accept inline data.
1808 */
1809 if (oi->ip_clusters != 0 || i_size_read(inode) != 0)
1810 return 0;
1811
1812 /*
1813 * Check whether the write can fit.
1814 */
Tiger Yangd9ae49d2009-03-05 11:06:15 +08001815 di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1816 if (mmap_page ||
1817 end > ocfs2_max_inline_data_with_xattr(inode->i_sb, di))
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001818 return 0;
1819
1820do_inline_write:
1821 ret = ocfs2_write_begin_inline(mapping, inode, wc);
1822 if (ret) {
1823 mlog_errno(ret);
1824 goto out;
1825 }
1826
1827 /*
1828 * This signals to the caller that the data can be written
1829 * inline.
1830 */
1831 written = 1;
1832out:
1833 return written ? written : ret;
1834}
1835
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001836/*
1837 * This function only does anything for file systems which can't
1838 * handle sparse files.
1839 *
1840 * What we want to do here is fill in any hole between the current end
1841 * of allocation and the end of our write. That way the rest of the
1842 * write path can treat it as an non-allocating write, which has no
1843 * special case code for sparse/nonsparse files.
1844 */
Joel Becker56934862010-07-01 15:13:31 -07001845static int ocfs2_expand_nonsparse_inode(struct inode *inode,
1846 struct buffer_head *di_bh,
1847 loff_t pos, unsigned len,
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001848 struct ocfs2_write_ctxt *wc)
1849{
1850 int ret;
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001851 loff_t newsize = pos + len;
1852
Joel Becker56934862010-07-01 15:13:31 -07001853 BUG_ON(ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)));
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001854
1855 if (newsize <= i_size_read(inode))
1856 return 0;
1857
Joel Becker56934862010-07-01 15:13:31 -07001858 ret = ocfs2_extend_no_holes(inode, di_bh, newsize, pos);
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001859 if (ret)
1860 mlog_errno(ret);
1861
Sunil Mushrane7432672009-08-06 16:12:58 -07001862 wc->w_first_new_cpos =
1863 ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode));
1864
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001865 return ret;
1866}
1867
Joel Becker56934862010-07-01 15:13:31 -07001868static int ocfs2_zero_tail(struct inode *inode, struct buffer_head *di_bh,
1869 loff_t pos)
1870{
1871 int ret = 0;
1872
1873 BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)));
1874 if (pos > i_size_read(inode))
1875 ret = ocfs2_zero_extend(inode, di_bh, pos);
1876
1877 return ret;
1878}
1879
Tao Ma50308d82010-11-04 15:14:11 +08001880/*
1881 * Try to flush truncate logs if we can free enough clusters from it.
1882 * As for return value, "< 0" means error, "0" no space and "1" means
1883 * we have freed enough spaces and let the caller try to allocate again.
1884 */
1885static int ocfs2_try_to_free_truncate_log(struct ocfs2_super *osb,
1886 unsigned int needed)
1887{
1888 tid_t target;
1889 int ret = 0;
1890 unsigned int truncated_clusters;
1891
1892 mutex_lock(&osb->osb_tl_inode->i_mutex);
1893 truncated_clusters = osb->truncated_clusters;
1894 mutex_unlock(&osb->osb_tl_inode->i_mutex);
1895
1896 /*
1897 * Check whether we can succeed in allocating if we free
1898 * the truncate log.
1899 */
1900 if (truncated_clusters < needed)
1901 goto out;
1902
1903 ret = ocfs2_flush_truncate_log(osb);
1904 if (ret) {
1905 mlog_errno(ret);
1906 goto out;
1907 }
1908
1909 if (jbd2_journal_start_commit(osb->journal->j_journal, &target)) {
1910 jbd2_log_wait_commit(osb->journal->j_journal, target);
1911 ret = 1;
1912 }
1913out:
1914 return ret;
1915}
1916
Tao Ma0378da0f2010-08-12 10:25:28 +08001917int ocfs2_write_begin_nolock(struct file *filp,
1918 struct address_space *mapping,
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001919 loff_t pos, unsigned len, unsigned flags,
1920 struct page **pagep, void **fsdata,
1921 struct buffer_head *di_bh, struct page *mmap_page)
1922{
Sunil Mushrane7432672009-08-06 16:12:58 -07001923 int ret, cluster_of_pages, credits = OCFS2_INODE_UPDATE_CREDITS;
Tao Ma50308d82010-11-04 15:14:11 +08001924 unsigned int clusters_to_alloc, extents_to_split, clusters_need = 0;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001925 struct ocfs2_write_ctxt *wc;
1926 struct inode *inode = mapping->host;
1927 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1928 struct ocfs2_dinode *di;
1929 struct ocfs2_alloc_context *data_ac = NULL;
1930 struct ocfs2_alloc_context *meta_ac = NULL;
1931 handle_t *handle;
Joel Beckerf99b9b72008-08-20 19:36:33 -07001932 struct ocfs2_extent_tree et;
Tao Ma50308d82010-11-04 15:14:11 +08001933 int try_free = 1, ret1;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001934
Tao Ma50308d82010-11-04 15:14:11 +08001935try_again:
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001936 ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh);
1937 if (ret) {
1938 mlog_errno(ret);
1939 return ret;
1940 }
1941
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001942 if (ocfs2_supports_inline_data(osb)) {
1943 ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len,
1944 mmap_page, wc);
1945 if (ret == 1) {
1946 ret = 0;
1947 goto success;
1948 }
1949 if (ret < 0) {
1950 mlog_errno(ret);
1951 goto out;
1952 }
1953 }
1954
Joel Becker56934862010-07-01 15:13:31 -07001955 if (ocfs2_sparse_alloc(osb))
1956 ret = ocfs2_zero_tail(inode, di_bh, pos);
1957 else
1958 ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos, len,
1959 wc);
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001960 if (ret) {
1961 mlog_errno(ret);
1962 goto out;
1963 }
1964
Tao Ma293b2f72009-08-25 08:02:48 +08001965 ret = ocfs2_check_range_for_refcount(inode, pos, len);
1966 if (ret < 0) {
1967 mlog_errno(ret);
1968 goto out;
1969 } else if (ret == 1) {
Tao Ma50308d82010-11-04 15:14:11 +08001970 clusters_need = wc->w_clen;
Tiger Yangc7dd3392013-08-13 16:00:58 -07001971 ret = ocfs2_refcount_cow(inode, di_bh,
Tao Ma37f8a2b2009-08-26 09:47:28 +08001972 wc->w_cpos, wc->w_clen, UINT_MAX);
Tao Ma293b2f72009-08-25 08:02:48 +08001973 if (ret) {
1974 mlog_errno(ret);
1975 goto out;
1976 }
1977 }
1978
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001979 ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc,
1980 &extents_to_split);
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001981 if (ret) {
1982 mlog_errno(ret);
1983 goto out;
1984 }
Tao Ma50308d82010-11-04 15:14:11 +08001985 clusters_need += clusters_to_alloc;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001986
1987 di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1988
Tao Ma95581562011-02-22 21:33:59 +08001989 trace_ocfs2_write_begin_nolock(
1990 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1991 (long long)i_size_read(inode),
1992 le32_to_cpu(di->i_clusters),
1993 pos, len, flags, mmap_page,
1994 clusters_to_alloc, extents_to_split);
1995
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001996 /*
1997 * We set w_target_from, w_target_to here so that
1998 * ocfs2_write_end() knows which range in the target page to
1999 * write out. An allocation requires that we write the entire
2000 * cluster range.
2001 */
Mark Fashehb27b7cb2007-06-18 11:22:56 -07002002 if (clusters_to_alloc || extents_to_split) {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002003 /*
2004 * XXX: We are stretching the limits of
Mark Fashehb27b7cb2007-06-18 11:22:56 -07002005 * ocfs2_lock_allocators(). It greatly over-estimates
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002006 * the work to be done.
2007 */
Joel Becker5e404e92009-02-13 03:54:22 -08002008 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
2009 wc->w_di_bh);
Joel Beckerf99b9b72008-08-20 19:36:33 -07002010 ret = ocfs2_lock_allocators(inode, &et,
Tao Ma231b87d2008-08-18 17:38:42 +08002011 clusters_to_alloc, extents_to_split,
Joel Beckerf99b9b72008-08-20 19:36:33 -07002012 &data_ac, &meta_ac);
Mark Fasheh9517bac2007-02-09 20:24:12 -08002013 if (ret) {
2014 mlog_errno(ret);
Mark Fasheh607d44a2007-05-09 15:14:45 -07002015 goto out;
Mark Fasheh9517bac2007-02-09 20:24:12 -08002016 }
2017
Mark Fasheh4fe370a2009-12-07 13:15:40 -08002018 if (data_ac)
2019 data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv;
2020
Tao Ma811f9332008-08-18 17:38:43 +08002021 credits = ocfs2_calc_extend_credits(inode->i_sb,
Goldwyn Rodrigues06f9da62013-11-12 15:06:52 -08002022 &di->id2.i_list);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002023
Mark Fasheh9517bac2007-02-09 20:24:12 -08002024 }
2025
Sunil Mushrane7432672009-08-06 16:12:58 -07002026 /*
2027 * We have to zero sparse allocated clusters, unwritten extent clusters,
2028 * and non-sparse clusters we just extended. For non-sparse writes,
2029 * we know zeros will only be needed in the first and/or last cluster.
2030 */
2031 if (clusters_to_alloc || extents_to_split ||
Sunil Mushran8379e7c2009-09-04 11:12:01 -07002032 (wc->w_clen && (wc->w_desc[0].c_needs_zero ||
2033 wc->w_desc[wc->w_clen - 1].c_needs_zero)))
Sunil Mushrane7432672009-08-06 16:12:58 -07002034 cluster_of_pages = 1;
2035 else
2036 cluster_of_pages = 0;
2037
2038 ocfs2_set_target_boundaries(osb, wc, pos, len, cluster_of_pages);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002039
Mark Fasheh9517bac2007-02-09 20:24:12 -08002040 handle = ocfs2_start_trans(osb, credits);
2041 if (IS_ERR(handle)) {
2042 ret = PTR_ERR(handle);
2043 mlog_errno(ret);
Mark Fasheh607d44a2007-05-09 15:14:45 -07002044 goto out;
Mark Fasheh9517bac2007-02-09 20:24:12 -08002045 }
2046
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002047 wc->w_handle = handle;
Mark Fasheh9517bac2007-02-09 20:24:12 -08002048
Christoph Hellwig5dd40562010-03-03 09:05:00 -05002049 if (clusters_to_alloc) {
2050 ret = dquot_alloc_space_nodirty(inode,
2051 ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc));
2052 if (ret)
2053 goto out_commit;
Jan Karaa90714c2008-10-09 19:38:40 +02002054 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002055 /*
2056 * We don't want this to fail in ocfs2_write_end(), so do it
2057 * here.
2058 */
Joel Becker0cf2f762009-02-12 16:41:25 -08002059 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
Joel Becker13723d02008-10-17 19:25:01 -07002060 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fasheh9517bac2007-02-09 20:24:12 -08002061 if (ret) {
2062 mlog_errno(ret);
Jan Karaa90714c2008-10-09 19:38:40 +02002063 goto out_quota;
Mark Fasheh9517bac2007-02-09 20:24:12 -08002064 }
2065
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002066 /*
2067 * Fill our page array first. That way we've grabbed enough so
2068 * that we can zero and flush if we error after adding the
2069 * extent.
2070 */
Joel Becker693c2412010-07-02 17:20:27 -07002071 ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, len,
Sunil Mushrane7432672009-08-06 16:12:58 -07002072 cluster_of_pages, mmap_page);
Wengang Wang5cffff92011-07-24 10:36:54 -07002073 if (ret && ret != -EAGAIN) {
Mark Fasheh9517bac2007-02-09 20:24:12 -08002074 mlog_errno(ret);
Jan Karaa90714c2008-10-09 19:38:40 +02002075 goto out_quota;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002076 }
Mark Fasheh9517bac2007-02-09 20:24:12 -08002077
Wengang Wang5cffff92011-07-24 10:36:54 -07002078 /*
2079 * ocfs2_grab_pages_for_write() returns -EAGAIN if it could not lock
2080 * the target page. In this case, we exit with no error and no target
2081 * page. This will trigger the caller, page_mkwrite(), to re-try
2082 * the operation.
2083 */
2084 if (ret == -EAGAIN) {
2085 BUG_ON(wc->w_target_page);
2086 ret = 0;
2087 goto out_quota;
2088 }
2089
Mark Fasheh0d172ba2007-05-14 18:09:54 -07002090 ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos,
2091 len);
2092 if (ret) {
2093 mlog_errno(ret);
Jan Karaa90714c2008-10-09 19:38:40 +02002094 goto out_quota;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002095 }
2096
2097 if (data_ac)
2098 ocfs2_free_alloc_context(data_ac);
2099 if (meta_ac)
2100 ocfs2_free_alloc_context(meta_ac);
2101
Mark Fasheh1afc32b2007-09-07 14:46:51 -07002102success:
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002103 *pagep = wc->w_target_page;
2104 *fsdata = wc;
2105 return 0;
Jan Karaa90714c2008-10-09 19:38:40 +02002106out_quota:
2107 if (clusters_to_alloc)
Christoph Hellwig5dd40562010-03-03 09:05:00 -05002108 dquot_free_space(inode,
Jan Karaa90714c2008-10-09 19:38:40 +02002109 ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc));
Mark Fasheh9517bac2007-02-09 20:24:12 -08002110out_commit:
2111 ocfs2_commit_trans(osb, handle);
2112
Mark Fasheh9517bac2007-02-09 20:24:12 -08002113out:
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002114 ocfs2_free_write_ctxt(wc);
2115
Xue jiufeib1214e42013-11-12 15:07:06 -08002116 if (data_ac) {
Mark Fasheh9517bac2007-02-09 20:24:12 -08002117 ocfs2_free_alloc_context(data_ac);
Xue jiufeib1214e42013-11-12 15:07:06 -08002118 data_ac = NULL;
2119 }
2120 if (meta_ac) {
Mark Fasheh9517bac2007-02-09 20:24:12 -08002121 ocfs2_free_alloc_context(meta_ac);
Xue jiufeib1214e42013-11-12 15:07:06 -08002122 meta_ac = NULL;
2123 }
Tao Ma50308d82010-11-04 15:14:11 +08002124
2125 if (ret == -ENOSPC && try_free) {
2126 /*
2127 * Try to free some truncate log so that we can have enough
2128 * clusters to allocate.
2129 */
2130 try_free = 0;
2131
2132 ret1 = ocfs2_try_to_free_truncate_log(osb, clusters_need);
2133 if (ret1 == 1)
2134 goto try_again;
2135
2136 if (ret1 < 0)
2137 mlog_errno(ret1);
2138 }
2139
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002140 return ret;
2141}
Mark Fasheh9517bac2007-02-09 20:24:12 -08002142
Nick Pigginb6af1bc2007-10-16 01:25:24 -07002143static int ocfs2_write_begin(struct file *file, struct address_space *mapping,
2144 loff_t pos, unsigned len, unsigned flags,
2145 struct page **pagep, void **fsdata)
Mark Fasheh607d44a2007-05-09 15:14:45 -07002146{
2147 int ret;
2148 struct buffer_head *di_bh = NULL;
2149 struct inode *inode = mapping->host;
2150
Mark Fashehe63aecb62007-10-18 15:30:42 -07002151 ret = ocfs2_inode_lock(inode, &di_bh, 1);
Mark Fasheh607d44a2007-05-09 15:14:45 -07002152 if (ret) {
2153 mlog_errno(ret);
2154 return ret;
2155 }
2156
2157 /*
2158 * Take alloc sem here to prevent concurrent lookups. That way
2159 * the mapping, zeroing and tree manipulation within
2160 * ocfs2_write() will be safe against ->readpage(). This
2161 * should also serve to lock out allocation from a shared
2162 * writeable region.
2163 */
2164 down_write(&OCFS2_I(inode)->ip_alloc_sem);
2165
Tao Ma0378da0f2010-08-12 10:25:28 +08002166 ret = ocfs2_write_begin_nolock(file, mapping, pos, len, flags, pagep,
Mark Fasheh7307de82007-05-09 15:16:19 -07002167 fsdata, di_bh, NULL);
Mark Fasheh607d44a2007-05-09 15:14:45 -07002168 if (ret) {
2169 mlog_errno(ret);
Mark Fashehc934a922007-10-18 15:23:46 -07002170 goto out_fail;
Mark Fasheh607d44a2007-05-09 15:14:45 -07002171 }
2172
2173 brelse(di_bh);
2174
2175 return 0;
2176
Mark Fasheh607d44a2007-05-09 15:14:45 -07002177out_fail:
2178 up_write(&OCFS2_I(inode)->ip_alloc_sem);
2179
2180 brelse(di_bh);
Mark Fashehe63aecb62007-10-18 15:30:42 -07002181 ocfs2_inode_unlock(inode, 1);
Mark Fasheh607d44a2007-05-09 15:14:45 -07002182
2183 return ret;
2184}
2185
Mark Fasheh1afc32b2007-09-07 14:46:51 -07002186static void ocfs2_write_end_inline(struct inode *inode, loff_t pos,
2187 unsigned len, unsigned *copied,
2188 struct ocfs2_dinode *di,
2189 struct ocfs2_write_ctxt *wc)
2190{
2191 void *kaddr;
2192
2193 if (unlikely(*copied < len)) {
2194 if (!PageUptodate(wc->w_target_page)) {
2195 *copied = 0;
2196 return;
2197 }
2198 }
2199
Cong Wangc4bc8dc2011-11-25 23:14:34 +08002200 kaddr = kmap_atomic(wc->w_target_page);
Mark Fasheh1afc32b2007-09-07 14:46:51 -07002201 memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied);
Cong Wangc4bc8dc2011-11-25 23:14:34 +08002202 kunmap_atomic(kaddr);
Mark Fasheh1afc32b2007-09-07 14:46:51 -07002203
Tao Ma95581562011-02-22 21:33:59 +08002204 trace_ocfs2_write_end_inline(
2205 (unsigned long long)OCFS2_I(inode)->ip_blkno,
Mark Fasheh1afc32b2007-09-07 14:46:51 -07002206 (unsigned long long)pos, *copied,
2207 le16_to_cpu(di->id2.i_data.id_count),
2208 le16_to_cpu(di->i_dyn_features));
2209}
2210
Mark Fasheh7307de82007-05-09 15:16:19 -07002211int ocfs2_write_end_nolock(struct address_space *mapping,
2212 loff_t pos, unsigned len, unsigned copied,
2213 struct page *page, void *fsdata)
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002214{
2215 int i;
2216 unsigned from, to, start = pos & (PAGE_CACHE_SIZE - 1);
2217 struct inode *inode = mapping->host;
2218 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2219 struct ocfs2_write_ctxt *wc = fsdata;
2220 struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
2221 handle_t *handle = wc->w_handle;
2222 struct page *tmppage;
2223
Mark Fasheh1afc32b2007-09-07 14:46:51 -07002224 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2225 ocfs2_write_end_inline(inode, pos, len, &copied, di, wc);
2226 goto out_write_size;
2227 }
2228
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002229 if (unlikely(copied < len)) {
2230 if (!PageUptodate(wc->w_target_page))
2231 copied = 0;
2232
2233 ocfs2_zero_new_buffers(wc->w_target_page, start+copied,
2234 start+len);
2235 }
2236 flush_dcache_page(wc->w_target_page);
2237
2238 for(i = 0; i < wc->w_num_pages; i++) {
2239 tmppage = wc->w_pages[i];
2240
2241 if (tmppage == wc->w_target_page) {
2242 from = wc->w_target_from;
2243 to = wc->w_target_to;
2244
2245 BUG_ON(from > PAGE_CACHE_SIZE ||
2246 to > PAGE_CACHE_SIZE ||
2247 to < from);
2248 } else {
2249 /*
2250 * Pages adjacent to the target (if any) imply
2251 * a hole-filling write in which case we want
2252 * to flush their entire range.
2253 */
2254 from = 0;
2255 to = PAGE_CACHE_SIZE;
2256 }
2257
Sunil Mushran961cecb2008-07-16 17:22:22 -07002258 if (page_has_buffers(tmppage)) {
Mark Fasheh53ef99c2008-11-18 16:53:43 -08002259 if (ocfs2_should_order_data(inode))
Joel Becker2b4e30f2008-09-03 20:03:41 -07002260 ocfs2_jbd2_file_inode(wc->w_handle, inode);
Sunil Mushran961cecb2008-07-16 17:22:22 -07002261 block_commit_write(tmppage, from, to);
2262 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002263 }
2264
Mark Fasheh1afc32b2007-09-07 14:46:51 -07002265out_write_size:
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002266 pos += copied;
Junxiao Bif17c20d2013-09-11 14:19:45 -07002267 if (pos > i_size_read(inode)) {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002268 i_size_write(inode, pos);
2269 mark_inode_dirty(inode);
2270 }
2271 inode->i_blocks = ocfs2_inode_sector_count(inode);
2272 di->i_size = cpu_to_le64((u64)i_size_read(inode));
2273 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2274 di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
2275 di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
Darrick J. Wong2931cdc2014-04-03 14:46:48 -07002276 ocfs2_update_inode_fsync_trans(handle, inode, 1);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002277 ocfs2_journal_dirty(handle, wc->w_di_bh);
2278
Junxiao Bi136f49b2014-12-18 16:17:37 -08002279 /* unlock pages before dealloc since it needs acquiring j_trans_barrier
2280 * lock, or it will cause a deadlock since journal commit threads holds
2281 * this lock and will ask for the page lock when flushing the data.
2282 * put it here to preserve the unlock order.
2283 */
2284 ocfs2_unlock_pages(wc);
2285
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002286 ocfs2_commit_trans(osb, handle);
Mark Fasheh59a5e412007-06-22 15:52:36 -07002287
Mark Fashehb27b7cb2007-06-18 11:22:56 -07002288 ocfs2_run_deallocs(osb, &wc->w_dealloc);
2289
Junxiao Bi136f49b2014-12-18 16:17:37 -08002290 brelse(wc->w_di_bh);
2291 kfree(wc);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002292
2293 return copied;
Mark Fasheh9517bac2007-02-09 20:24:12 -08002294}
2295
Nick Pigginb6af1bc2007-10-16 01:25:24 -07002296static int ocfs2_write_end(struct file *file, struct address_space *mapping,
2297 loff_t pos, unsigned len, unsigned copied,
2298 struct page *page, void *fsdata)
Mark Fasheh607d44a2007-05-09 15:14:45 -07002299{
2300 int ret;
2301 struct inode *inode = mapping->host;
2302
2303 ret = ocfs2_write_end_nolock(mapping, pos, len, copied, page, fsdata);
2304
Mark Fasheh607d44a2007-05-09 15:14:45 -07002305 up_write(&OCFS2_I(inode)->ip_alloc_sem);
Mark Fashehe63aecb62007-10-18 15:30:42 -07002306 ocfs2_inode_unlock(inode, 1);
Mark Fasheh607d44a2007-05-09 15:14:45 -07002307
2308 return ret;
2309}
2310
Christoph Hellwigf5e54d62006-06-28 04:26:44 -07002311const struct address_space_operations ocfs2_aops = {
Hisashi Hifumi1fca3a02009-03-05 17:22:21 +09002312 .readpage = ocfs2_readpage,
2313 .readpages = ocfs2_readpages,
2314 .writepage = ocfs2_writepage,
2315 .write_begin = ocfs2_write_begin,
2316 .write_end = ocfs2_write_end,
2317 .bmap = ocfs2_bmap,
Hisashi Hifumi1fca3a02009-03-05 17:22:21 +09002318 .direct_IO = ocfs2_direct_IO,
Jan Kara41ecc342013-11-12 15:07:08 -08002319 .invalidatepage = block_invalidatepage,
Hisashi Hifumi1fca3a02009-03-05 17:22:21 +09002320 .releasepage = ocfs2_releasepage,
2321 .migratepage = buffer_migrate_page,
2322 .is_partially_uptodate = block_is_partially_uptodate,
Andi Kleenaa261f52009-09-16 11:50:16 +02002323 .error_remove_page = generic_error_remove_page,
Mark Fashehccd979b2005-12-15 14:31:24 -08002324};