blob: 1fbb0e20131bf39e82f1822e0de172b7889497de [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>
Mark Fashehccd979b2005-12-15 14:31:24 -080031
32#define MLOG_MASK_PREFIX ML_FILE_IO
33#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"
Mark Fashehccd979b2005-12-15 14:31:24 -080048
49#include "buffer_head_io.h"
50
51static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock,
52 struct buffer_head *bh_result, int create)
53{
54 int err = -EIO;
55 int status;
56 struct ocfs2_dinode *fe = NULL;
57 struct buffer_head *bh = NULL;
58 struct buffer_head *buffer_cache_bh = NULL;
59 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
60 void *kaddr;
61
62 mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode,
63 (unsigned long long)iblock, bh_result, create);
64
65 BUG_ON(ocfs2_inode_is_fast_symlink(inode));
66
67 if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) {
68 mlog(ML_ERROR, "block offset > PATH_MAX: %llu",
69 (unsigned long long)iblock);
70 goto bail;
71 }
72
Joel Beckerb657c952008-11-13 14:49:11 -080073 status = ocfs2_read_inode_block(inode, &bh);
Mark Fashehccd979b2005-12-15 14:31:24 -080074 if (status < 0) {
75 mlog_errno(status);
76 goto bail;
77 }
78 fe = (struct ocfs2_dinode *) bh->b_data;
79
Mark Fashehccd979b2005-12-15 14:31:24 -080080 if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb,
81 le32_to_cpu(fe->i_clusters))) {
82 mlog(ML_ERROR, "block offset is outside the allocated size: "
83 "%llu\n", (unsigned long long)iblock);
84 goto bail;
85 }
86
87 /* We don't use the page cache to create symlink data, so if
88 * need be, copy it over from the buffer cache. */
89 if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) {
90 u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) +
91 iblock;
92 buffer_cache_bh = sb_getblk(osb->sb, blkno);
93 if (!buffer_cache_bh) {
94 mlog(ML_ERROR, "couldn't getblock for symlink!\n");
95 goto bail;
96 }
97
98 /* we haven't locked out transactions, so a commit
99 * could've happened. Since we've got a reference on
100 * the bh, even if it commits while we're doing the
101 * copy, the data is still good. */
102 if (buffer_jbd(buffer_cache_bh)
103 && ocfs2_inode_is_new(inode)) {
104 kaddr = kmap_atomic(bh_result->b_page, KM_USER0);
105 if (!kaddr) {
106 mlog(ML_ERROR, "couldn't kmap!\n");
107 goto bail;
108 }
109 memcpy(kaddr + (bh_result->b_size * iblock),
110 buffer_cache_bh->b_data,
111 bh_result->b_size);
112 kunmap_atomic(kaddr, KM_USER0);
113 set_buffer_uptodate(bh_result);
114 }
115 brelse(buffer_cache_bh);
116 }
117
118 map_bh(bh_result, inode->i_sb,
119 le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock);
120
121 err = 0;
122
123bail:
Mark Fasheha81cb882008-10-07 14:25:16 -0700124 brelse(bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800125
126 mlog_exit(err);
127 return err;
128}
129
Tao Ma6f70fa52009-08-25 08:05:12 +0800130int ocfs2_get_block(struct inode *inode, sector_t iblock,
131 struct buffer_head *bh_result, int create)
Mark Fashehccd979b2005-12-15 14:31:24 -0800132{
133 int err = 0;
Mark Fasheh49cb8d22007-03-09 16:21:46 -0800134 unsigned int ext_flags;
Mark Fasheh628a24f2007-10-30 12:08:32 -0700135 u64 max_blocks = bh_result->b_size >> inode->i_blkbits;
136 u64 p_blkno, count, past_eof;
Mark Fasheh25baf2d2007-02-14 15:30:30 -0800137 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
Mark Fashehccd979b2005-12-15 14:31:24 -0800138
139 mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode,
140 (unsigned long long)iblock, bh_result, create);
141
142 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE)
143 mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n",
144 inode, inode->i_ino);
145
146 if (S_ISLNK(inode->i_mode)) {
147 /* this always does I/O for some reason. */
148 err = ocfs2_symlink_get_block(inode, iblock, bh_result, create);
149 goto bail;
150 }
151
Mark Fasheh628a24f2007-10-30 12:08:32 -0700152 err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &count,
Mark Fasheh49cb8d22007-03-09 16:21:46 -0800153 &ext_flags);
Mark Fashehccd979b2005-12-15 14:31:24 -0800154 if (err) {
155 mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, "
Mark Fashehb06970532006-03-03 10:24:33 -0800156 "%llu, NULL)\n", err, inode, (unsigned long long)iblock,
157 (unsigned long long)p_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -0800158 goto bail;
159 }
160
Mark Fasheh628a24f2007-10-30 12:08:32 -0700161 if (max_blocks < count)
162 count = max_blocks;
163
Mark Fasheh25baf2d2007-02-14 15:30:30 -0800164 /*
165 * ocfs2 never allocates in this function - the only time we
166 * need to use BH_New is when we're extending i_size on a file
167 * system which doesn't support holes, in which case BH_New
Christoph Hellwigebdec242010-10-06 10:47:23 +0200168 * allows __block_write_begin() to zero.
Coly Lic0420ad2008-06-30 18:45:45 +0800169 *
170 * If we see this on a sparse file system, then a truncate has
171 * raced us and removed the cluster. In this case, we clear
172 * the buffers dirty and uptodate bits and let the buffer code
173 * ignore it as a hole.
Mark Fasheh25baf2d2007-02-14 15:30:30 -0800174 */
Coly Lic0420ad2008-06-30 18:45:45 +0800175 if (create && p_blkno == 0 && ocfs2_sparse_alloc(osb)) {
176 clear_buffer_dirty(bh_result);
177 clear_buffer_uptodate(bh_result);
178 goto bail;
179 }
Mark Fashehccd979b2005-12-15 14:31:24 -0800180
Mark Fasheh49cb8d22007-03-09 16:21:46 -0800181 /* Treat the unwritten extent as a hole for zeroing purposes. */
182 if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN))
Mark Fasheh25baf2d2007-02-14 15:30:30 -0800183 map_bh(bh_result, inode->i_sb, p_blkno);
184
Mark Fasheh628a24f2007-10-30 12:08:32 -0700185 bh_result->b_size = count << inode->i_blkbits;
186
Mark Fasheh25baf2d2007-02-14 15:30:30 -0800187 if (!ocfs2_sparse_alloc(osb)) {
188 if (p_blkno == 0) {
189 err = -EIO;
190 mlog(ML_ERROR,
191 "iblock = %llu p_blkno = %llu blkno=(%llu)\n",
192 (unsigned long long)iblock,
193 (unsigned long long)p_blkno,
194 (unsigned long long)OCFS2_I(inode)->ip_blkno);
195 mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters);
196 dump_stack();
Wengang Wang1f4cea32009-07-13 11:38:58 +0800197 goto bail;
Mark Fasheh25baf2d2007-02-14 15:30:30 -0800198 }
Mark Fashehccd979b2005-12-15 14:31:24 -0800199 }
200
Joel Becker56934862010-07-01 15:13:31 -0700201 past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
202 mlog(0, "Inode %lu, past_eof = %llu\n", inode->i_ino,
203 (unsigned long long)past_eof);
204 if (create && (iblock >= past_eof))
205 set_buffer_new(bh_result);
206
Mark Fashehccd979b2005-12-15 14:31:24 -0800207bail:
208 if (err < 0)
209 err = -EIO;
210
211 mlog_exit(err);
212 return err;
213}
214
Mark Fasheh1afc32b2007-09-07 14:46:51 -0700215int ocfs2_read_inline_data(struct inode *inode, struct page *page,
216 struct buffer_head *di_bh)
Mark Fasheh6798d352007-09-07 14:05:51 -0700217{
218 void *kaddr;
Jan Karad2849fb2007-12-19 15:24:09 +0100219 loff_t size;
Mark Fasheh6798d352007-09-07 14:05:51 -0700220 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
221
222 if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) {
223 ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag",
224 (unsigned long long)OCFS2_I(inode)->ip_blkno);
225 return -EROFS;
226 }
227
228 size = i_size_read(inode);
229
230 if (size > PAGE_CACHE_SIZE ||
Tiger Yangd9ae49d2009-03-05 11:06:15 +0800231 size > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) {
Mark Fasheh6798d352007-09-07 14:05:51 -0700232 ocfs2_error(inode->i_sb,
Jan Karad2849fb2007-12-19 15:24:09 +0100233 "Inode %llu has with inline data has bad size: %Lu",
234 (unsigned long long)OCFS2_I(inode)->ip_blkno,
235 (unsigned long long)size);
Mark Fasheh6798d352007-09-07 14:05:51 -0700236 return -EROFS;
237 }
238
239 kaddr = kmap_atomic(page, KM_USER0);
240 if (size)
241 memcpy(kaddr, di->id2.i_data.id_data, size);
242 /* Clear the remaining part of the page */
243 memset(kaddr + size, 0, PAGE_CACHE_SIZE - size);
244 flush_dcache_page(page);
245 kunmap_atomic(kaddr, KM_USER0);
246
247 SetPageUptodate(page);
248
249 return 0;
250}
251
252static int ocfs2_readpage_inline(struct inode *inode, struct page *page)
253{
254 int ret;
255 struct buffer_head *di_bh = NULL;
Mark Fasheh6798d352007-09-07 14:05:51 -0700256
257 BUG_ON(!PageLocked(page));
Julia Lawall86c838b2008-02-26 21:45:56 +0100258 BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL));
Mark Fasheh6798d352007-09-07 14:05:51 -0700259
Joel Beckerb657c952008-11-13 14:49:11 -0800260 ret = ocfs2_read_inode_block(inode, &di_bh);
Mark Fasheh6798d352007-09-07 14:05:51 -0700261 if (ret) {
262 mlog_errno(ret);
263 goto out;
264 }
265
266 ret = ocfs2_read_inline_data(inode, page, di_bh);
267out:
268 unlock_page(page);
269
270 brelse(di_bh);
271 return ret;
272}
273
Mark Fashehccd979b2005-12-15 14:31:24 -0800274static int ocfs2_readpage(struct file *file, struct page *page)
275{
276 struct inode *inode = page->mapping->host;
Mark Fasheh6798d352007-09-07 14:05:51 -0700277 struct ocfs2_inode_info *oi = OCFS2_I(inode);
Mark Fashehccd979b2005-12-15 14:31:24 -0800278 loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT;
279 int ret, unlock = 1;
280
281 mlog_entry("(0x%p, %lu)\n", file, (page ? page->index : 0));
282
Mark Fashehe63aecb62007-10-18 15:30:42 -0700283 ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page);
Mark Fashehccd979b2005-12-15 14:31:24 -0800284 if (ret != 0) {
285 if (ret == AOP_TRUNCATED_PAGE)
286 unlock = 0;
287 mlog_errno(ret);
288 goto out;
289 }
290
Mark Fasheh6798d352007-09-07 14:05:51 -0700291 if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
Mark Fashehe9dfc0b2007-05-14 11:38:51 -0700292 ret = AOP_TRUNCATED_PAGE;
Mark Fashehe63aecb62007-10-18 15:30:42 -0700293 goto out_inode_unlock;
Mark Fashehe9dfc0b2007-05-14 11:38:51 -0700294 }
Mark Fashehccd979b2005-12-15 14:31:24 -0800295
296 /*
297 * i_size might have just been updated as we grabed the meta lock. We
298 * might now be discovering a truncate that hit on another node.
299 * block_read_full_page->get_block freaks out if it is asked to read
300 * beyond the end of a file, so we check here. Callers
Nick Piggin54cb8822007-07-19 01:46:59 -0700301 * (generic_file_read, vm_ops->fault) are clever enough to check i_size
Mark Fashehccd979b2005-12-15 14:31:24 -0800302 * and notice that the page they just read isn't needed.
303 *
304 * XXX sys_readahead() seems to get that wrong?
305 */
306 if (start >= i_size_read(inode)) {
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800307 zero_user(page, 0, PAGE_SIZE);
Mark Fashehccd979b2005-12-15 14:31:24 -0800308 SetPageUptodate(page);
309 ret = 0;
310 goto out_alloc;
311 }
312
Mark Fasheh6798d352007-09-07 14:05:51 -0700313 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
314 ret = ocfs2_readpage_inline(inode, page);
315 else
316 ret = block_read_full_page(page, ocfs2_get_block);
Mark Fashehccd979b2005-12-15 14:31:24 -0800317 unlock = 0;
318
Mark Fashehccd979b2005-12-15 14:31:24 -0800319out_alloc:
320 up_read(&OCFS2_I(inode)->ip_alloc_sem);
Mark Fashehe63aecb62007-10-18 15:30:42 -0700321out_inode_unlock:
322 ocfs2_inode_unlock(inode, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -0800323out:
324 if (unlock)
325 unlock_page(page);
326 mlog_exit(ret);
327 return ret;
328}
329
Mark Fasheh628a24f2007-10-30 12:08:32 -0700330/*
331 * This is used only for read-ahead. Failures or difficult to handle
332 * situations are safe to ignore.
333 *
334 * Right now, we don't bother with BH_Boundary - in-inode extent lists
335 * are quite large (243 extents on 4k blocks), so most inodes don't
336 * grow out to a tree. If need be, detecting boundary extents could
337 * trivially be added in a future version of ocfs2_get_block().
338 */
339static int ocfs2_readpages(struct file *filp, struct address_space *mapping,
340 struct list_head *pages, unsigned nr_pages)
341{
342 int ret, err = -EIO;
343 struct inode *inode = mapping->host;
344 struct ocfs2_inode_info *oi = OCFS2_I(inode);
345 loff_t start;
346 struct page *last;
347
348 /*
349 * Use the nonblocking flag for the dlm code to avoid page
350 * lock inversion, but don't bother with retrying.
351 */
352 ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK);
353 if (ret)
354 return err;
355
356 if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
357 ocfs2_inode_unlock(inode, 0);
358 return err;
359 }
360
361 /*
362 * Don't bother with inline-data. There isn't anything
363 * to read-ahead in that case anyway...
364 */
365 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
366 goto out_unlock;
367
368 /*
369 * Check whether a remote node truncated this file - we just
370 * drop out in that case as it's not worth handling here.
371 */
372 last = list_entry(pages->prev, struct page, lru);
373 start = (loff_t)last->index << PAGE_CACHE_SHIFT;
374 if (start >= i_size_read(inode))
375 goto out_unlock;
376
377 err = mpage_readpages(mapping, pages, nr_pages, ocfs2_get_block);
378
379out_unlock:
380 up_read(&oi->ip_alloc_sem);
381 ocfs2_inode_unlock(inode, 0);
382
383 return err;
384}
385
Mark Fashehccd979b2005-12-15 14:31:24 -0800386/* Note: Because we don't support holes, our allocation has
387 * already happened (allocation writes zeros to the file data)
388 * so we don't have to worry about ordered writes in
389 * ocfs2_writepage.
390 *
391 * ->writepage is called during the process of invalidating the page cache
392 * during blocked lock processing. It can't block on any cluster locks
393 * to during block mapping. It's relying on the fact that the block
394 * mapping can't have disappeared under the dirty pages that it is
395 * being asked to write back.
396 */
397static int ocfs2_writepage(struct page *page, struct writeback_control *wbc)
398{
399 int ret;
400
401 mlog_entry("(0x%p)\n", page);
402
403 ret = block_write_full_page(page, ocfs2_get_block, wbc);
404
405 mlog_exit(ret);
406
407 return ret;
408}
409
Mark Fashehccd979b2005-12-15 14:31:24 -0800410/* Taken from ext3. We don't necessarily need the full blown
411 * functionality yet, but IMHO it's better to cut and paste the whole
412 * thing so we can avoid introducing our own bugs (and easily pick up
413 * their fixes when they happen) --Mark */
Mark Fasheh60b11392007-02-16 11:46:50 -0800414int walk_page_buffers( handle_t *handle,
415 struct buffer_head *head,
416 unsigned from,
417 unsigned to,
418 int *partial,
419 int (*fn)( handle_t *handle,
420 struct buffer_head *bh))
Mark Fashehccd979b2005-12-15 14:31:24 -0800421{
422 struct buffer_head *bh;
423 unsigned block_start, block_end;
424 unsigned blocksize = head->b_size;
425 int err, ret = 0;
426 struct buffer_head *next;
427
428 for ( bh = head, block_start = 0;
429 ret == 0 && (bh != head || !block_start);
430 block_start = block_end, bh = next)
431 {
432 next = bh->b_this_page;
433 block_end = block_start + blocksize;
434 if (block_end <= from || block_start >= to) {
435 if (partial && !buffer_uptodate(bh))
436 *partial = 1;
437 continue;
438 }
439 err = (*fn)(handle, bh);
440 if (!ret)
441 ret = err;
442 }
443 return ret;
444}
445
Mark Fashehccd979b2005-12-15 14:31:24 -0800446static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block)
447{
448 sector_t status;
449 u64 p_blkno = 0;
450 int err = 0;
451 struct inode *inode = mapping->host;
452
453 mlog_entry("(block = %llu)\n", (unsigned long long)block);
454
455 /* We don't need to lock journal system files, since they aren't
456 * accessed concurrently from multiple nodes.
457 */
458 if (!INODE_JOURNAL(inode)) {
Mark Fashehe63aecb62007-10-18 15:30:42 -0700459 err = ocfs2_inode_lock(inode, NULL, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -0800460 if (err) {
461 if (err != -ENOENT)
462 mlog_errno(err);
463 goto bail;
464 }
465 down_read(&OCFS2_I(inode)->ip_alloc_sem);
466 }
467
Mark Fasheh6798d352007-09-07 14:05:51 -0700468 if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
469 err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL,
470 NULL);
Mark Fashehccd979b2005-12-15 14:31:24 -0800471
472 if (!INODE_JOURNAL(inode)) {
473 up_read(&OCFS2_I(inode)->ip_alloc_sem);
Mark Fashehe63aecb62007-10-18 15:30:42 -0700474 ocfs2_inode_unlock(inode, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -0800475 }
476
477 if (err) {
478 mlog(ML_ERROR, "get_blocks() failed, block = %llu\n",
479 (unsigned long long)block);
480 mlog_errno(err);
481 goto bail;
482 }
483
Mark Fashehccd979b2005-12-15 14:31:24 -0800484bail:
485 status = err ? 0 : p_blkno;
486
487 mlog_exit((int)status);
488
489 return status;
490}
491
492/*
493 * TODO: Make this into a generic get_blocks function.
494 *
495 * From do_direct_io in direct-io.c:
496 * "So what we do is to permit the ->get_blocks function to populate
497 * bh.b_size with the size of IO which is permitted at this offset and
498 * this i_blkbits."
499 *
500 * This function is called directly from get_more_blocks in direct-io.c.
501 *
502 * called like this: dio->get_blocks(dio->inode, fs_startblk,
503 * fs_count, map_bh, dio->rw == WRITE);
Christoph Hellwig5fe878a2009-12-15 16:47:50 -0800504 *
505 * Note that we never bother to allocate blocks here, and thus ignore the
506 * create argument.
Mark Fashehccd979b2005-12-15 14:31:24 -0800507 */
508static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
Mark Fashehccd979b2005-12-15 14:31:24 -0800509 struct buffer_head *bh_result, int create)
510{
511 int ret;
Mark Fasheh4f902c32007-03-09 16:26:50 -0800512 u64 p_blkno, inode_blocks, contig_blocks;
Mark Fasheh49cb8d22007-03-09 16:21:46 -0800513 unsigned int ext_flags;
Florin Malita184d7d22006-06-03 19:30:10 -0400514 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -0800515 unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
Mark Fashehccd979b2005-12-15 14:31:24 -0800516
Mark Fashehccd979b2005-12-15 14:31:24 -0800517 /* This function won't even be called if the request isn't all
518 * nicely aligned and of the right size, so there's no need
519 * for us to check any of that. */
520
Mark Fasheh25baf2d2007-02-14 15:30:30 -0800521 inode_blocks = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
Mark Fasheh564f8a32006-12-14 13:01:05 -0800522
Mark Fashehccd979b2005-12-15 14:31:24 -0800523 /* This figures out the size of the next contiguous block, and
524 * our logical offset */
Mark Fasheh363041a2007-01-17 12:31:35 -0800525 ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno,
Mark Fasheh49cb8d22007-03-09 16:21:46 -0800526 &contig_blocks, &ext_flags);
Mark Fashehccd979b2005-12-15 14:31:24 -0800527 if (ret) {
528 mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n",
529 (unsigned long long)iblock);
530 ret = -EIO;
531 goto bail;
532 }
533
Tao Macbaee472010-02-26 10:54:52 +0800534 /* We should already CoW the refcounted extent in case of create. */
535 BUG_ON(create && (ext_flags & OCFS2_EXT_REFCOUNTED));
536
Mark Fasheh25baf2d2007-02-14 15:30:30 -0800537 /*
538 * get_more_blocks() expects us to describe a hole by clearing
539 * the mapped bit on bh_result().
Mark Fasheh49cb8d22007-03-09 16:21:46 -0800540 *
541 * Consider an unwritten extent as a hole.
Mark Fasheh25baf2d2007-02-14 15:30:30 -0800542 */
Mark Fasheh49cb8d22007-03-09 16:21:46 -0800543 if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN))
Mark Fasheh25baf2d2007-02-14 15:30:30 -0800544 map_bh(bh_result, inode->i_sb, p_blkno);
Christoph Hellwig5fe878a2009-12-15 16:47:50 -0800545 else
Mark Fasheh25baf2d2007-02-14 15:30:30 -0800546 clear_buffer_mapped(bh_result);
Mark Fashehccd979b2005-12-15 14:31:24 -0800547
548 /* make sure we don't map more than max_blocks blocks here as
549 that's all the kernel will handle at this point. */
550 if (max_blocks < contig_blocks)
551 contig_blocks = max_blocks;
552 bh_result->b_size = contig_blocks << blocksize_bits;
553bail:
554 return ret;
555}
556
Sunil Mushran2bd63212010-01-25 16:57:38 -0800557/*
Mark Fashehccd979b2005-12-15 14:31:24 -0800558 * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're
559 * particularly interested in the aio/dio case. Like the core uses
560 * i_alloc_sem, we use the rw_lock DLM lock to protect io on one node from
561 * truncation on another.
562 */
563static void ocfs2_dio_end_io(struct kiocb *iocb,
564 loff_t offset,
565 ssize_t bytes,
Christoph Hellwig40e2e972010-07-18 21:17:09 +0000566 void *private,
567 int ret,
568 bool is_async)
Mark Fashehccd979b2005-12-15 14:31:24 -0800569{
Josef Sipekd28c9172006-12-08 02:37:25 -0800570 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
Mark Fasheh7cdfc3a2007-04-16 17:28:51 -0700571 int level;
Mark Fashehccd979b2005-12-15 14:31:24 -0800572
573 /* this io's submitter should not have unlocked this before we could */
574 BUG_ON(!ocfs2_iocb_is_rw_locked(iocb));
Mark Fasheh7cdfc3a2007-04-16 17:28:51 -0700575
Tristan Ye39c99f12010-12-07 14:35:07 +0800576 if (ocfs2_iocb_is_sem_locked(iocb)) {
577 up_read(&inode->i_alloc_sem);
578 ocfs2_iocb_clear_sem_locked(iocb);
579 }
580
Mark Fashehccd979b2005-12-15 14:31:24 -0800581 ocfs2_iocb_clear_rw_locked(iocb);
Mark Fasheh7cdfc3a2007-04-16 17:28:51 -0700582
583 level = ocfs2_iocb_rw_locked_level(iocb);
Mark Fasheh7cdfc3a2007-04-16 17:28:51 -0700584 ocfs2_rw_unlock(inode, level);
Christoph Hellwig40e2e972010-07-18 21:17:09 +0000585
586 if (is_async)
587 aio_complete(iocb, ret, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -0800588}
589
Joel Becker03f981c2007-01-04 14:54:41 -0800590/*
591 * ocfs2_invalidatepage() and ocfs2_releasepage() are shamelessly stolen
592 * from ext3. PageChecked() bits have been removed as OCFS2 does not
593 * do journalled data.
594 */
595static void ocfs2_invalidatepage(struct page *page, unsigned long offset)
596{
597 journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
598
Joel Becker2b4e30f2008-09-03 20:03:41 -0700599 jbd2_journal_invalidatepage(journal, page, offset);
Joel Becker03f981c2007-01-04 14:54:41 -0800600}
601
602static int ocfs2_releasepage(struct page *page, gfp_t wait)
603{
604 journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
605
606 if (!page_has_buffers(page))
607 return 0;
Joel Becker2b4e30f2008-09-03 20:03:41 -0700608 return jbd2_journal_try_to_free_buffers(journal, page, wait);
Joel Becker03f981c2007-01-04 14:54:41 -0800609}
610
Mark Fashehccd979b2005-12-15 14:31:24 -0800611static ssize_t ocfs2_direct_IO(int rw,
612 struct kiocb *iocb,
613 const struct iovec *iov,
614 loff_t offset,
615 unsigned long nr_segs)
616{
617 struct file *file = iocb->ki_filp;
Josef Sipekd28c9172006-12-08 02:37:25 -0800618 struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
Mark Fashehccd979b2005-12-15 14:31:24 -0800619 int ret;
620
621 mlog_entry_void();
Mark Fasheh53013cb2006-05-05 19:04:03 -0700622
Mark Fasheh6798d352007-09-07 14:05:51 -0700623 /*
624 * Fallback to buffered I/O if we see an inode without
625 * extents.
626 */
627 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
628 return 0;
629
Tao Mab80474b2009-09-10 15:28:47 +0800630 /* Fallback to buffered I/O if we are appending. */
631 if (i_size_read(inode) <= offset)
632 return 0;
633
Christoph Hellwigeafdc7d2010-06-04 11:29:53 +0200634 ret = __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev,
635 iov, offset, nr_segs,
636 ocfs2_direct_IO_get_blocks,
637 ocfs2_dio_end_io, NULL, 0);
Mark Fashehc934a922007-10-18 15:23:46 -0700638
Mark Fashehccd979b2005-12-15 14:31:24 -0800639 mlog_exit(ret);
640 return ret;
641}
642
Mark Fasheh9517bac2007-02-09 20:24:12 -0800643static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb,
644 u32 cpos,
645 unsigned int *start,
646 unsigned int *end)
647{
648 unsigned int cluster_start = 0, cluster_end = PAGE_CACHE_SIZE;
649
650 if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) {
651 unsigned int cpp;
652
653 cpp = 1 << (PAGE_CACHE_SHIFT - osb->s_clustersize_bits);
654
655 cluster_start = cpos % cpp;
656 cluster_start = cluster_start << osb->s_clustersize_bits;
657
658 cluster_end = cluster_start + osb->s_clustersize;
659 }
660
661 BUG_ON(cluster_start > PAGE_SIZE);
662 BUG_ON(cluster_end > PAGE_SIZE);
663
664 if (start)
665 *start = cluster_start;
666 if (end)
667 *end = cluster_end;
668}
669
670/*
671 * 'from' and 'to' are the region in the page to avoid zeroing.
672 *
673 * If pagesize > clustersize, this function will avoid zeroing outside
674 * of the cluster boundary.
675 *
676 * from == to == 0 is code for "zero the entire cluster region"
677 */
678static void ocfs2_clear_page_regions(struct page *page,
679 struct ocfs2_super *osb, u32 cpos,
680 unsigned from, unsigned to)
681{
682 void *kaddr;
683 unsigned int cluster_start, cluster_end;
684
685 ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end);
686
687 kaddr = kmap_atomic(page, KM_USER0);
688
689 if (from || to) {
690 if (from > cluster_start)
691 memset(kaddr + cluster_start, 0, from - cluster_start);
692 if (to < cluster_end)
693 memset(kaddr + to, 0, cluster_end - to);
694 } else {
695 memset(kaddr + cluster_start, 0, cluster_end - cluster_start);
696 }
697
698 kunmap_atomic(kaddr, KM_USER0);
699}
700
701/*
Mark Fasheh4e9563f2007-11-01 11:37:48 -0700702 * Nonsparse file systems fully allocate before we get to the write
703 * code. This prevents ocfs2_write() from tagging the write as an
704 * allocating one, which means ocfs2_map_page_blocks() might try to
705 * read-in the blocks at the tail of our file. Avoid reading them by
706 * testing i_size against each block offset.
707 */
708static int ocfs2_should_read_blk(struct inode *inode, struct page *page,
709 unsigned int block_start)
710{
711 u64 offset = page_offset(page) + block_start;
712
713 if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
714 return 1;
715
716 if (i_size_read(inode) > offset)
717 return 1;
718
719 return 0;
720}
721
722/*
Christoph Hellwigebdec242010-10-06 10:47:23 +0200723 * Some of this taken from __block_write_begin(). We already have our
Mark Fasheh9517bac2007-02-09 20:24:12 -0800724 * mapping by now though, and the entire write will be allocating or
725 * it won't, so not much need to use BH_New.
726 *
727 * This will also skip zeroing, which is handled externally.
728 */
Mark Fasheh60b11392007-02-16 11:46:50 -0800729int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
730 struct inode *inode, unsigned int from,
731 unsigned int to, int new)
Mark Fasheh9517bac2007-02-09 20:24:12 -0800732{
733 int ret = 0;
734 struct buffer_head *head, *bh, *wait[2], **wait_bh = wait;
735 unsigned int block_end, block_start;
736 unsigned int bsize = 1 << inode->i_blkbits;
737
738 if (!page_has_buffers(page))
739 create_empty_buffers(page, bsize, 0);
740
741 head = page_buffers(page);
742 for (bh = head, block_start = 0; bh != head || !block_start;
743 bh = bh->b_this_page, block_start += bsize) {
744 block_end = block_start + bsize;
745
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700746 clear_buffer_new(bh);
747
Mark Fasheh9517bac2007-02-09 20:24:12 -0800748 /*
749 * Ignore blocks outside of our i/o range -
750 * they may belong to unallocated clusters.
751 */
Mark Fasheh60b11392007-02-16 11:46:50 -0800752 if (block_start >= to || block_end <= from) {
Mark Fasheh9517bac2007-02-09 20:24:12 -0800753 if (PageUptodate(page))
754 set_buffer_uptodate(bh);
755 continue;
756 }
757
758 /*
759 * For an allocating write with cluster size >= page
760 * size, we always write the entire page.
761 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700762 if (new)
763 set_buffer_new(bh);
Mark Fasheh9517bac2007-02-09 20:24:12 -0800764
765 if (!buffer_mapped(bh)) {
766 map_bh(bh, inode->i_sb, *p_blkno);
767 unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
768 }
769
770 if (PageUptodate(page)) {
771 if (!buffer_uptodate(bh))
772 set_buffer_uptodate(bh);
773 } else if (!buffer_uptodate(bh) && !buffer_delay(bh) &&
Mark Fashehbce99762007-06-18 11:12:36 -0700774 !buffer_new(bh) &&
Mark Fasheh4e9563f2007-11-01 11:37:48 -0700775 ocfs2_should_read_blk(inode, page, block_start) &&
Mark Fashehbce99762007-06-18 11:12:36 -0700776 (block_start < from || block_end > to)) {
Mark Fasheh9517bac2007-02-09 20:24:12 -0800777 ll_rw_block(READ, 1, &bh);
778 *wait_bh++=bh;
779 }
780
781 *p_blkno = *p_blkno + 1;
782 }
783
784 /*
785 * If we issued read requests - let them complete.
786 */
787 while(wait_bh > wait) {
788 wait_on_buffer(*--wait_bh);
789 if (!buffer_uptodate(*wait_bh))
790 ret = -EIO;
791 }
792
793 if (ret == 0 || !new)
794 return ret;
795
796 /*
797 * If we get -EIO above, zero out any newly allocated blocks
798 * to avoid exposing stale data.
799 */
800 bh = head;
801 block_start = 0;
802 do {
Mark Fasheh9517bac2007-02-09 20:24:12 -0800803 block_end = block_start + bsize;
804 if (block_end <= from)
805 goto next_bh;
806 if (block_start >= to)
807 break;
808
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800809 zero_user(page, block_start, bh->b_size);
Mark Fasheh9517bac2007-02-09 20:24:12 -0800810 set_buffer_uptodate(bh);
811 mark_buffer_dirty(bh);
812
813next_bh:
814 block_start = block_end;
815 bh = bh->b_this_page;
816 } while (bh != head);
817
818 return ret;
819}
820
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700821#if (PAGE_CACHE_SIZE >= OCFS2_MAX_CLUSTERSIZE)
822#define OCFS2_MAX_CTXT_PAGES 1
823#else
824#define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_CACHE_SIZE)
825#endif
Mark Fasheh6af67d82007-03-06 17:24:46 -0800826
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700827#define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_CACHE_SIZE / OCFS2_MIN_CLUSTERSIZE)
Mark Fasheh6af67d82007-03-06 17:24:46 -0800828
829/*
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700830 * Describe the state of a single cluster to be written to.
Mark Fasheh9517bac2007-02-09 20:24:12 -0800831 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700832struct ocfs2_write_cluster_desc {
833 u32 c_cpos;
834 u32 c_phys;
Mark Fasheh9517bac2007-02-09 20:24:12 -0800835 /*
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700836 * Give this a unique field because c_phys eventually gets
837 * filled.
Mark Fasheh9517bac2007-02-09 20:24:12 -0800838 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700839 unsigned c_new;
Mark Fashehb27b7cb2007-06-18 11:22:56 -0700840 unsigned c_unwritten;
Sunil Mushrane7432672009-08-06 16:12:58 -0700841 unsigned c_needs_zero;
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700842};
Mark Fasheh9517bac2007-02-09 20:24:12 -0800843
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700844struct ocfs2_write_ctxt {
845 /* Logical cluster position / len of write */
846 u32 w_cpos;
847 u32 w_clen;
Mark Fasheh9517bac2007-02-09 20:24:12 -0800848
Sunil Mushrane7432672009-08-06 16:12:58 -0700849 /* First cluster allocated in a nonsparse extend */
850 u32 w_first_new_cpos;
851
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700852 struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE];
Mark Fasheh9517bac2007-02-09 20:24:12 -0800853
854 /*
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700855 * This is true if page_size > cluster_size.
Mark Fasheh9517bac2007-02-09 20:24:12 -0800856 *
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700857 * It triggers a set of special cases during write which might
858 * have to deal with allocating writes to partial pages.
Mark Fasheh9517bac2007-02-09 20:24:12 -0800859 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700860 unsigned int w_large_pages;
Mark Fasheh9517bac2007-02-09 20:24:12 -0800861
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700862 /*
863 * Pages involved in this write.
864 *
865 * w_target_page is the page being written to by the user.
866 *
867 * w_pages is an array of pages which always contains
868 * w_target_page, and in the case of an allocating write with
869 * page_size < cluster size, it will contain zero'd and mapped
870 * pages adjacent to w_target_page which need to be written
871 * out in so that future reads from that region will get
872 * zero's.
873 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700874 unsigned int w_num_pages;
Goldwyn Rodrigues83fd9c72010-06-10 17:21:36 -0500875 struct page *w_pages[OCFS2_MAX_CTXT_PAGES];
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700876 struct page *w_target_page;
Mark Fasheh9517bac2007-02-09 20:24:12 -0800877
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700878 /*
879 * ocfs2_write_end() uses this to know what the real range to
880 * write in the target should be.
881 */
882 unsigned int w_target_from;
883 unsigned int w_target_to;
884
885 /*
886 * We could use journal_current_handle() but this is cleaner,
887 * IMHO -Mark
888 */
889 handle_t *w_handle;
890
891 struct buffer_head *w_di_bh;
Mark Fashehb27b7cb2007-06-18 11:22:56 -0700892
893 struct ocfs2_cached_dealloc_ctxt w_dealloc;
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700894};
895
Mark Fasheh1d410a62007-09-07 14:20:45 -0700896void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages)
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700897{
898 int i;
899
Mark Fasheh1d410a62007-09-07 14:20:45 -0700900 for(i = 0; i < num_pages; i++) {
901 if (pages[i]) {
902 unlock_page(pages[i]);
903 mark_page_accessed(pages[i]);
904 page_cache_release(pages[i]);
905 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700906 }
Mark Fasheh1d410a62007-09-07 14:20:45 -0700907}
908
909static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt *wc)
910{
911 ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages);
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700912
913 brelse(wc->w_di_bh);
914 kfree(wc);
915}
916
917static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp,
918 struct ocfs2_super *osb, loff_t pos,
Mark Fasheh607d44a2007-05-09 15:14:45 -0700919 unsigned len, struct buffer_head *di_bh)
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700920{
tao.ma@oracle.com30b85482007-09-06 08:02:25 +0800921 u32 cend;
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700922 struct ocfs2_write_ctxt *wc;
923
924 wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS);
925 if (!wc)
926 return -ENOMEM;
927
928 wc->w_cpos = pos >> osb->s_clustersize_bits;
Sunil Mushrane7432672009-08-06 16:12:58 -0700929 wc->w_first_new_cpos = UINT_MAX;
tao.ma@oracle.com30b85482007-09-06 08:02:25 +0800930 cend = (pos + len - 1) >> osb->s_clustersize_bits;
931 wc->w_clen = cend - wc->w_cpos + 1;
Mark Fasheh607d44a2007-05-09 15:14:45 -0700932 get_bh(di_bh);
933 wc->w_di_bh = di_bh;
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700934
935 if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits))
936 wc->w_large_pages = 1;
937 else
938 wc->w_large_pages = 0;
939
Mark Fashehb27b7cb2007-06-18 11:22:56 -0700940 ocfs2_init_dealloc_ctxt(&wc->w_dealloc);
941
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700942 *wcp = wc;
943
944 return 0;
Mark Fasheh9517bac2007-02-09 20:24:12 -0800945}
946
947/*
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700948 * If a page has any new buffers, zero them out here, and mark them uptodate
949 * and dirty so they'll be written out (in order to prevent uninitialised
950 * block data from leaking). And clear the new bit.
Mark Fasheh9517bac2007-02-09 20:24:12 -0800951 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700952static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to)
Mark Fasheh9517bac2007-02-09 20:24:12 -0800953{
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700954 unsigned int block_start, block_end;
955 struct buffer_head *head, *bh;
Mark Fasheh9517bac2007-02-09 20:24:12 -0800956
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700957 BUG_ON(!PageLocked(page));
958 if (!page_has_buffers(page))
959 return;
960
961 bh = head = page_buffers(page);
962 block_start = 0;
963 do {
964 block_end = block_start + bh->b_size;
965
966 if (buffer_new(bh)) {
967 if (block_end > from && block_start < to) {
968 if (!PageUptodate(page)) {
969 unsigned start, end;
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700970
971 start = max(from, block_start);
972 end = min(to, block_end);
973
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800974 zero_user_segment(page, start, end);
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700975 set_buffer_uptodate(bh);
976 }
977
978 clear_buffer_new(bh);
979 mark_buffer_dirty(bh);
980 }
981 }
982
983 block_start = block_end;
984 bh = bh->b_this_page;
985 } while (bh != head);
986}
987
988/*
989 * Only called when we have a failure during allocating write to write
990 * zero's to the newly allocated region.
991 */
992static void ocfs2_write_failure(struct inode *inode,
993 struct ocfs2_write_ctxt *wc,
994 loff_t user_pos, unsigned user_len)
995{
996 int i;
Mark Fasheh5c26a7b2007-09-18 17:49:29 -0700997 unsigned from = user_pos & (PAGE_CACHE_SIZE - 1),
998 to = user_pos + user_len;
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700999 struct page *tmppage;
1000
Mark Fasheh5c26a7b2007-09-18 17:49:29 -07001001 ocfs2_zero_new_buffers(wc->w_target_page, from, to);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001002
1003 for(i = 0; i < wc->w_num_pages; i++) {
1004 tmppage = wc->w_pages[i];
1005
Sunil Mushran961cecb2008-07-16 17:22:22 -07001006 if (page_has_buffers(tmppage)) {
Mark Fasheh53ef99c2008-11-18 16:53:43 -08001007 if (ocfs2_should_order_data(inode))
Joel Becker2b4e30f2008-09-03 20:03:41 -07001008 ocfs2_jbd2_file_inode(wc->w_handle, inode);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001009
Sunil Mushran961cecb2008-07-16 17:22:22 -07001010 block_commit_write(tmppage, from, to);
1011 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001012 }
1013}
1014
1015static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno,
1016 struct ocfs2_write_ctxt *wc,
1017 struct page *page, u32 cpos,
1018 loff_t user_pos, unsigned user_len,
1019 int new)
1020{
1021 int ret;
1022 unsigned int map_from = 0, map_to = 0;
1023 unsigned int cluster_start, cluster_end;
1024 unsigned int user_data_from = 0, user_data_to = 0;
1025
1026 ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos,
Mark Fasheh9517bac2007-02-09 20:24:12 -08001027 &cluster_start, &cluster_end);
1028
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001029 if (page == wc->w_target_page) {
1030 map_from = user_pos & (PAGE_CACHE_SIZE - 1);
1031 map_to = map_from + user_len;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001032
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001033 if (new)
1034 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
1035 cluster_start, cluster_end,
1036 new);
1037 else
1038 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
1039 map_from, map_to, new);
1040 if (ret) {
Mark Fasheh9517bac2007-02-09 20:24:12 -08001041 mlog_errno(ret);
1042 goto out;
1043 }
1044
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001045 user_data_from = map_from;
1046 user_data_to = map_to;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001047 if (new) {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001048 map_from = cluster_start;
1049 map_to = cluster_end;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001050 }
1051 } else {
1052 /*
1053 * If we haven't allocated the new page yet, we
1054 * shouldn't be writing it out without copying user
1055 * data. This is likely a math error from the caller.
1056 */
1057 BUG_ON(!new);
1058
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001059 map_from = cluster_start;
1060 map_to = cluster_end;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001061
1062 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001063 cluster_start, cluster_end, new);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001064 if (ret) {
1065 mlog_errno(ret);
1066 goto out;
1067 }
1068 }
1069
1070 /*
1071 * Parts of newly allocated pages need to be zero'd.
1072 *
1073 * Above, we have also rewritten 'to' and 'from' - as far as
1074 * the rest of the function is concerned, the entire cluster
1075 * range inside of a page needs to be written.
1076 *
1077 * We can skip this if the page is up to date - it's already
1078 * been zero'd from being read in as a hole.
1079 */
1080 if (new && !PageUptodate(page))
1081 ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb),
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001082 cpos, user_data_from, user_data_to);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001083
1084 flush_dcache_page(page);
1085
Mark Fasheh9517bac2007-02-09 20:24:12 -08001086out:
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001087 return ret;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001088}
1089
1090/*
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001091 * This function will only grab one clusters worth of pages.
Mark Fasheh9517bac2007-02-09 20:24:12 -08001092 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001093static int ocfs2_grab_pages_for_write(struct address_space *mapping,
1094 struct ocfs2_write_ctxt *wc,
Joel Becker693c2412010-07-02 17:20:27 -07001095 u32 cpos, loff_t user_pos,
1096 unsigned user_len, int new,
Mark Fasheh7307de82007-05-09 15:16:19 -07001097 struct page *mmap_page)
Mark Fasheh9517bac2007-02-09 20:24:12 -08001098{
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001099 int ret = 0, i;
Joel Becker693c2412010-07-02 17:20:27 -07001100 unsigned long start, target_index, end_index, index;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001101 struct inode *inode = mapping->host;
Joel Becker693c2412010-07-02 17:20:27 -07001102 loff_t last_byte;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001103
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001104 target_index = user_pos >> PAGE_CACHE_SHIFT;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001105
1106 /*
1107 * Figure out how many pages we'll be manipulating here. For
Mark Fasheh60b11392007-02-16 11:46:50 -08001108 * non allocating write, we just change the one
Joel Becker693c2412010-07-02 17:20:27 -07001109 * page. Otherwise, we'll need a whole clusters worth. If we're
1110 * writing past i_size, we only need enough pages to cover the
1111 * last page of the write.
Mark Fasheh9517bac2007-02-09 20:24:12 -08001112 */
Mark Fasheh9517bac2007-02-09 20:24:12 -08001113 if (new) {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001114 wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb);
1115 start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos);
Joel Becker693c2412010-07-02 17:20:27 -07001116 /*
1117 * We need the index *past* the last page we could possibly
1118 * touch. This is the page past the end of the write or
1119 * i_size, whichever is greater.
1120 */
1121 last_byte = max(user_pos + user_len, i_size_read(inode));
1122 BUG_ON(last_byte < 1);
1123 end_index = ((last_byte - 1) >> PAGE_CACHE_SHIFT) + 1;
1124 if ((start + wc->w_num_pages) > end_index)
1125 wc->w_num_pages = end_index - start;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001126 } else {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001127 wc->w_num_pages = 1;
1128 start = target_index;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001129 }
1130
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001131 for(i = 0; i < wc->w_num_pages; i++) {
Mark Fasheh9517bac2007-02-09 20:24:12 -08001132 index = start + i;
1133
Mark Fasheh7307de82007-05-09 15:16:19 -07001134 if (index == target_index && mmap_page) {
1135 /*
1136 * ocfs2_pagemkwrite() is a little different
1137 * and wants us to directly use the page
1138 * passed in.
1139 */
1140 lock_page(mmap_page);
1141
1142 if (mmap_page->mapping != mapping) {
1143 unlock_page(mmap_page);
1144 /*
1145 * Sanity check - the locking in
1146 * ocfs2_pagemkwrite() should ensure
1147 * that this code doesn't trigger.
1148 */
1149 ret = -EINVAL;
1150 mlog_errno(ret);
1151 goto out;
1152 }
1153
1154 page_cache_get(mmap_page);
1155 wc->w_pages[i] = mmap_page;
1156 } else {
1157 wc->w_pages[i] = find_or_create_page(mapping, index,
1158 GFP_NOFS);
1159 if (!wc->w_pages[i]) {
1160 ret = -ENOMEM;
1161 mlog_errno(ret);
1162 goto out;
1163 }
Mark Fasheh9517bac2007-02-09 20:24:12 -08001164 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001165
1166 if (index == target_index)
1167 wc->w_target_page = wc->w_pages[i];
Mark Fasheh9517bac2007-02-09 20:24:12 -08001168 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001169out:
1170 return ret;
1171}
1172
1173/*
1174 * Prepare a single cluster for write one cluster into the file.
1175 */
1176static int ocfs2_write_cluster(struct address_space *mapping,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001177 u32 phys, unsigned int unwritten,
Sunil Mushrane7432672009-08-06 16:12:58 -07001178 unsigned int should_zero,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001179 struct ocfs2_alloc_context *data_ac,
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001180 struct ocfs2_alloc_context *meta_ac,
1181 struct ocfs2_write_ctxt *wc, u32 cpos,
1182 loff_t user_pos, unsigned user_len)
1183{
Sunil Mushrane7432672009-08-06 16:12:58 -07001184 int ret, i, new;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001185 u64 v_blkno, p_blkno;
1186 struct inode *inode = mapping->host;
Joel Beckerf99b9b72008-08-20 19:36:33 -07001187 struct ocfs2_extent_tree et;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001188
1189 new = phys == 0 ? 1 : 0;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001190 if (new) {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001191 u32 tmp_pos;
1192
Mark Fasheh9517bac2007-02-09 20:24:12 -08001193 /*
1194 * This is safe to call with the page locks - it won't take
1195 * any additional semaphores or cluster locks.
1196 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001197 tmp_pos = cpos;
Tao Ma0eb8d472008-08-18 17:38:45 +08001198 ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode,
1199 &tmp_pos, 1, 0, wc->w_di_bh,
1200 wc->w_handle, data_ac,
1201 meta_ac, NULL);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001202 /*
1203 * This shouldn't happen because we must have already
1204 * calculated the correct meta data allocation required. The
1205 * internal tree allocation code should know how to increase
1206 * transaction credits itself.
1207 *
1208 * If need be, we could handle -EAGAIN for a
1209 * RESTART_TRANS here.
1210 */
1211 mlog_bug_on_msg(ret == -EAGAIN,
1212 "Inode %llu: EAGAIN return during allocation.\n",
1213 (unsigned long long)OCFS2_I(inode)->ip_blkno);
1214 if (ret < 0) {
1215 mlog_errno(ret);
1216 goto out;
1217 }
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001218 } else if (unwritten) {
Joel Becker5e404e92009-02-13 03:54:22 -08001219 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
1220 wc->w_di_bh);
Joel Beckerf99b9b72008-08-20 19:36:33 -07001221 ret = ocfs2_mark_extent_written(inode, &et,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001222 wc->w_handle, cpos, 1, phys,
Joel Beckerf99b9b72008-08-20 19:36:33 -07001223 meta_ac, &wc->w_dealloc);
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001224 if (ret < 0) {
1225 mlog_errno(ret);
1226 goto out;
1227 }
Mark Fasheh9517bac2007-02-09 20:24:12 -08001228 }
1229
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001230 if (should_zero)
1231 v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, cpos);
1232 else
1233 v_blkno = user_pos >> inode->i_sb->s_blocksize_bits;
1234
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001235 /*
1236 * The only reason this should fail is due to an inability to
1237 * find the extent added.
1238 */
Mark Fasheh49cb8d22007-03-09 16:21:46 -08001239 ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL,
1240 NULL);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001241 if (ret < 0) {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001242 ocfs2_error(inode->i_sb, "Corrupting extend for inode %llu, "
1243 "at logical block %llu",
1244 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1245 (unsigned long long)v_blkno);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001246 goto out;
1247 }
1248
1249 BUG_ON(p_blkno == 0);
1250
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001251 for(i = 0; i < wc->w_num_pages; i++) {
1252 int tmpret;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001253
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001254 tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc,
1255 wc->w_pages[i], cpos,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001256 user_pos, user_len,
1257 should_zero);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001258 if (tmpret) {
1259 mlog_errno(tmpret);
1260 if (ret == 0)
Wengang Wangcbfa9632009-07-13 11:38:23 +08001261 ret = tmpret;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001262 }
Mark Fasheh9517bac2007-02-09 20:24:12 -08001263 }
1264
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001265 /*
1266 * We only have cleanup to do in case of allocating write.
1267 */
1268 if (ret && new)
1269 ocfs2_write_failure(inode, wc, user_pos, user_len);
1270
Mark Fasheh9517bac2007-02-09 20:24:12 -08001271out:
Mark Fasheh9517bac2007-02-09 20:24:12 -08001272
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001273 return ret;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001274}
1275
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001276static int ocfs2_write_cluster_by_desc(struct address_space *mapping,
1277 struct ocfs2_alloc_context *data_ac,
1278 struct ocfs2_alloc_context *meta_ac,
1279 struct ocfs2_write_ctxt *wc,
1280 loff_t pos, unsigned len)
1281{
1282 int ret, i;
Mark Fashehdb562462007-09-17 09:06:29 -07001283 loff_t cluster_off;
1284 unsigned int local_len = len;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001285 struct ocfs2_write_cluster_desc *desc;
Mark Fashehdb562462007-09-17 09:06:29 -07001286 struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb);
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001287
1288 for (i = 0; i < wc->w_clen; i++) {
1289 desc = &wc->w_desc[i];
1290
Mark Fashehdb562462007-09-17 09:06:29 -07001291 /*
1292 * We have to make sure that the total write passed in
1293 * doesn't extend past a single cluster.
1294 */
1295 local_len = len;
1296 cluster_off = pos & (osb->s_clustersize - 1);
1297 if ((cluster_off + local_len) > osb->s_clustersize)
1298 local_len = osb->s_clustersize - cluster_off;
1299
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001300 ret = ocfs2_write_cluster(mapping, desc->c_phys,
Sunil Mushrane7432672009-08-06 16:12:58 -07001301 desc->c_unwritten,
1302 desc->c_needs_zero,
1303 data_ac, meta_ac,
Mark Fashehdb562462007-09-17 09:06:29 -07001304 wc, desc->c_cpos, pos, local_len);
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001305 if (ret) {
1306 mlog_errno(ret);
1307 goto out;
1308 }
Mark Fashehdb562462007-09-17 09:06:29 -07001309
1310 len -= local_len;
1311 pos += local_len;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001312 }
1313
1314 ret = 0;
1315out:
1316 return ret;
1317}
1318
Mark Fasheh9517bac2007-02-09 20:24:12 -08001319/*
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001320 * ocfs2_write_end() wants to know which parts of the target page it
1321 * should complete the write on. It's easiest to compute them ahead of
1322 * time when a more complete view of the write is available.
Mark Fasheh9517bac2007-02-09 20:24:12 -08001323 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001324static void ocfs2_set_target_boundaries(struct ocfs2_super *osb,
1325 struct ocfs2_write_ctxt *wc,
1326 loff_t pos, unsigned len, int alloc)
Mark Fasheh9517bac2007-02-09 20:24:12 -08001327{
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001328 struct ocfs2_write_cluster_desc *desc;
1329
1330 wc->w_target_from = pos & (PAGE_CACHE_SIZE - 1);
1331 wc->w_target_to = wc->w_target_from + len;
1332
1333 if (alloc == 0)
1334 return;
1335
1336 /*
1337 * Allocating write - we may have different boundaries based
1338 * on page size and cluster size.
1339 *
1340 * NOTE: We can no longer compute one value from the other as
1341 * the actual write length and user provided length may be
1342 * different.
1343 */
1344
1345 if (wc->w_large_pages) {
1346 /*
1347 * We only care about the 1st and last cluster within
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001348 * our range and whether they should be zero'd or not. Either
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001349 * value may be extended out to the start/end of a
1350 * newly allocated cluster.
1351 */
1352 desc = &wc->w_desc[0];
Sunil Mushrane7432672009-08-06 16:12:58 -07001353 if (desc->c_needs_zero)
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001354 ocfs2_figure_cluster_boundaries(osb,
1355 desc->c_cpos,
1356 &wc->w_target_from,
1357 NULL);
1358
1359 desc = &wc->w_desc[wc->w_clen - 1];
Sunil Mushrane7432672009-08-06 16:12:58 -07001360 if (desc->c_needs_zero)
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001361 ocfs2_figure_cluster_boundaries(osb,
1362 desc->c_cpos,
1363 NULL,
1364 &wc->w_target_to);
1365 } else {
1366 wc->w_target_from = 0;
1367 wc->w_target_to = PAGE_CACHE_SIZE;
1368 }
1369}
1370
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001371/*
1372 * Populate each single-cluster write descriptor in the write context
1373 * with information about the i/o to be done.
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001374 *
1375 * Returns the number of clusters that will have to be allocated, as
1376 * well as a worst case estimate of the number of extent records that
1377 * would have to be created during a write to an unwritten region.
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001378 */
1379static int ocfs2_populate_write_desc(struct inode *inode,
1380 struct ocfs2_write_ctxt *wc,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001381 unsigned int *clusters_to_alloc,
1382 unsigned int *extents_to_split)
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001383{
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001384 int ret;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001385 struct ocfs2_write_cluster_desc *desc;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001386 unsigned int num_clusters = 0;
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001387 unsigned int ext_flags = 0;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001388 u32 phys = 0;
1389 int i;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001390
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001391 *clusters_to_alloc = 0;
1392 *extents_to_split = 0;
1393
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001394 for (i = 0; i < wc->w_clen; i++) {
1395 desc = &wc->w_desc[i];
1396 desc->c_cpos = wc->w_cpos + i;
1397
1398 if (num_clusters == 0) {
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001399 /*
1400 * Need to look up the next extent record.
1401 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001402 ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001403 &num_clusters, &ext_flags);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001404 if (ret) {
1405 mlog_errno(ret);
Mark Fasheh607d44a2007-05-09 15:14:45 -07001406 goto out;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001407 }
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001408
Tao Ma293b2f72009-08-25 08:02:48 +08001409 /* We should already CoW the refcountd extent. */
1410 BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1411
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001412 /*
1413 * Assume worst case - that we're writing in
1414 * the middle of the extent.
1415 *
1416 * We can assume that the write proceeds from
1417 * left to right, in which case the extent
1418 * insert code is smart enough to coalesce the
1419 * next splits into the previous records created.
1420 */
1421 if (ext_flags & OCFS2_EXT_UNWRITTEN)
1422 *extents_to_split = *extents_to_split + 2;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001423 } else if (phys) {
1424 /*
1425 * Only increment phys if it doesn't describe
1426 * a hole.
1427 */
1428 phys++;
1429 }
1430
Sunil Mushrane7432672009-08-06 16:12:58 -07001431 /*
1432 * If w_first_new_cpos is < UINT_MAX, we have a non-sparse
1433 * file that got extended. w_first_new_cpos tells us
1434 * where the newly allocated clusters are so we can
1435 * zero them.
1436 */
1437 if (desc->c_cpos >= wc->w_first_new_cpos) {
1438 BUG_ON(phys == 0);
1439 desc->c_needs_zero = 1;
1440 }
1441
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001442 desc->c_phys = phys;
1443 if (phys == 0) {
1444 desc->c_new = 1;
Sunil Mushrane7432672009-08-06 16:12:58 -07001445 desc->c_needs_zero = 1;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001446 *clusters_to_alloc = *clusters_to_alloc + 1;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001447 }
Sunil Mushrane7432672009-08-06 16:12:58 -07001448
1449 if (ext_flags & OCFS2_EXT_UNWRITTEN) {
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001450 desc->c_unwritten = 1;
Sunil Mushrane7432672009-08-06 16:12:58 -07001451 desc->c_needs_zero = 1;
1452 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001453
1454 num_clusters--;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001455 }
1456
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001457 ret = 0;
1458out:
1459 return ret;
1460}
1461
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001462static int ocfs2_write_begin_inline(struct address_space *mapping,
1463 struct inode *inode,
1464 struct ocfs2_write_ctxt *wc)
1465{
1466 int ret;
1467 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1468 struct page *page;
1469 handle_t *handle;
1470 struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1471
1472 page = find_or_create_page(mapping, 0, GFP_NOFS);
1473 if (!page) {
1474 ret = -ENOMEM;
1475 mlog_errno(ret);
1476 goto out;
1477 }
1478 /*
1479 * If we don't set w_num_pages then this page won't get unlocked
1480 * and freed on cleanup of the write context.
1481 */
1482 wc->w_pages[0] = wc->w_target_page = page;
1483 wc->w_num_pages = 1;
1484
1485 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1486 if (IS_ERR(handle)) {
1487 ret = PTR_ERR(handle);
1488 mlog_errno(ret);
1489 goto out;
1490 }
1491
Joel Becker0cf2f762009-02-12 16:41:25 -08001492 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
Joel Becker13723d02008-10-17 19:25:01 -07001493 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001494 if (ret) {
1495 ocfs2_commit_trans(osb, handle);
1496
1497 mlog_errno(ret);
1498 goto out;
1499 }
1500
1501 if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
1502 ocfs2_set_inode_data_inline(inode, di);
1503
1504 if (!PageUptodate(page)) {
1505 ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh);
1506 if (ret) {
1507 ocfs2_commit_trans(osb, handle);
1508
1509 goto out;
1510 }
1511 }
1512
1513 wc->w_handle = handle;
1514out:
1515 return ret;
1516}
1517
1518int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size)
1519{
1520 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1521
Mark Fasheh0d8a4e02007-11-20 11:48:41 -08001522 if (new_size <= le16_to_cpu(di->id2.i_data.id_count))
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001523 return 1;
1524 return 0;
1525}
1526
1527static int ocfs2_try_to_write_inline_data(struct address_space *mapping,
1528 struct inode *inode, loff_t pos,
1529 unsigned len, struct page *mmap_page,
1530 struct ocfs2_write_ctxt *wc)
1531{
1532 int ret, written = 0;
1533 loff_t end = pos + len;
1534 struct ocfs2_inode_info *oi = OCFS2_I(inode);
Tiger Yangd9ae49d2009-03-05 11:06:15 +08001535 struct ocfs2_dinode *di = NULL;
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001536
1537 mlog(0, "Inode %llu, write of %u bytes at off %llu. features: 0x%x\n",
1538 (unsigned long long)oi->ip_blkno, len, (unsigned long long)pos,
1539 oi->ip_dyn_features);
1540
1541 /*
1542 * Handle inodes which already have inline data 1st.
1543 */
1544 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1545 if (mmap_page == NULL &&
1546 ocfs2_size_fits_inline_data(wc->w_di_bh, end))
1547 goto do_inline_write;
1548
1549 /*
1550 * The write won't fit - we have to give this inode an
1551 * inline extent list now.
1552 */
1553 ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh);
1554 if (ret)
1555 mlog_errno(ret);
1556 goto out;
1557 }
1558
1559 /*
1560 * Check whether the inode can accept inline data.
1561 */
1562 if (oi->ip_clusters != 0 || i_size_read(inode) != 0)
1563 return 0;
1564
1565 /*
1566 * Check whether the write can fit.
1567 */
Tiger Yangd9ae49d2009-03-05 11:06:15 +08001568 di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1569 if (mmap_page ||
1570 end > ocfs2_max_inline_data_with_xattr(inode->i_sb, di))
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001571 return 0;
1572
1573do_inline_write:
1574 ret = ocfs2_write_begin_inline(mapping, inode, wc);
1575 if (ret) {
1576 mlog_errno(ret);
1577 goto out;
1578 }
1579
1580 /*
1581 * This signals to the caller that the data can be written
1582 * inline.
1583 */
1584 written = 1;
1585out:
1586 return written ? written : ret;
1587}
1588
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001589/*
1590 * This function only does anything for file systems which can't
1591 * handle sparse files.
1592 *
1593 * What we want to do here is fill in any hole between the current end
1594 * of allocation and the end of our write. That way the rest of the
1595 * write path can treat it as an non-allocating write, which has no
1596 * special case code for sparse/nonsparse files.
1597 */
Joel Becker56934862010-07-01 15:13:31 -07001598static int ocfs2_expand_nonsparse_inode(struct inode *inode,
1599 struct buffer_head *di_bh,
1600 loff_t pos, unsigned len,
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001601 struct ocfs2_write_ctxt *wc)
1602{
1603 int ret;
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001604 loff_t newsize = pos + len;
1605
Joel Becker56934862010-07-01 15:13:31 -07001606 BUG_ON(ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)));
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001607
1608 if (newsize <= i_size_read(inode))
1609 return 0;
1610
Joel Becker56934862010-07-01 15:13:31 -07001611 ret = ocfs2_extend_no_holes(inode, di_bh, newsize, pos);
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001612 if (ret)
1613 mlog_errno(ret);
1614
Sunil Mushrane7432672009-08-06 16:12:58 -07001615 wc->w_first_new_cpos =
1616 ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode));
1617
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001618 return ret;
1619}
1620
Joel Becker56934862010-07-01 15:13:31 -07001621static int ocfs2_zero_tail(struct inode *inode, struct buffer_head *di_bh,
1622 loff_t pos)
1623{
1624 int ret = 0;
1625
1626 BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)));
1627 if (pos > i_size_read(inode))
1628 ret = ocfs2_zero_extend(inode, di_bh, pos);
1629
1630 return ret;
1631}
1632
Tao Ma50308d82010-11-04 15:14:11 +08001633/*
1634 * Try to flush truncate logs if we can free enough clusters from it.
1635 * As for return value, "< 0" means error, "0" no space and "1" means
1636 * we have freed enough spaces and let the caller try to allocate again.
1637 */
1638static int ocfs2_try_to_free_truncate_log(struct ocfs2_super *osb,
1639 unsigned int needed)
1640{
1641 tid_t target;
1642 int ret = 0;
1643 unsigned int truncated_clusters;
1644
1645 mutex_lock(&osb->osb_tl_inode->i_mutex);
1646 truncated_clusters = osb->truncated_clusters;
1647 mutex_unlock(&osb->osb_tl_inode->i_mutex);
1648
1649 /*
1650 * Check whether we can succeed in allocating if we free
1651 * the truncate log.
1652 */
1653 if (truncated_clusters < needed)
1654 goto out;
1655
1656 ret = ocfs2_flush_truncate_log(osb);
1657 if (ret) {
1658 mlog_errno(ret);
1659 goto out;
1660 }
1661
1662 if (jbd2_journal_start_commit(osb->journal->j_journal, &target)) {
1663 jbd2_log_wait_commit(osb->journal->j_journal, target);
1664 ret = 1;
1665 }
1666out:
1667 return ret;
1668}
1669
Tao Ma0378da0f2010-08-12 10:25:28 +08001670int ocfs2_write_begin_nolock(struct file *filp,
1671 struct address_space *mapping,
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001672 loff_t pos, unsigned len, unsigned flags,
1673 struct page **pagep, void **fsdata,
1674 struct buffer_head *di_bh, struct page *mmap_page)
1675{
Sunil Mushrane7432672009-08-06 16:12:58 -07001676 int ret, cluster_of_pages, credits = OCFS2_INODE_UPDATE_CREDITS;
Tao Ma50308d82010-11-04 15:14:11 +08001677 unsigned int clusters_to_alloc, extents_to_split, clusters_need = 0;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001678 struct ocfs2_write_ctxt *wc;
1679 struct inode *inode = mapping->host;
1680 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1681 struct ocfs2_dinode *di;
1682 struct ocfs2_alloc_context *data_ac = NULL;
1683 struct ocfs2_alloc_context *meta_ac = NULL;
1684 handle_t *handle;
Joel Beckerf99b9b72008-08-20 19:36:33 -07001685 struct ocfs2_extent_tree et;
Tao Ma50308d82010-11-04 15:14:11 +08001686 int try_free = 1, ret1;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001687
Tao Ma50308d82010-11-04 15:14:11 +08001688try_again:
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001689 ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh);
1690 if (ret) {
1691 mlog_errno(ret);
1692 return ret;
1693 }
1694
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001695 if (ocfs2_supports_inline_data(osb)) {
1696 ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len,
1697 mmap_page, wc);
1698 if (ret == 1) {
1699 ret = 0;
1700 goto success;
1701 }
1702 if (ret < 0) {
1703 mlog_errno(ret);
1704 goto out;
1705 }
1706 }
1707
Joel Becker56934862010-07-01 15:13:31 -07001708 if (ocfs2_sparse_alloc(osb))
1709 ret = ocfs2_zero_tail(inode, di_bh, pos);
1710 else
1711 ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos, len,
1712 wc);
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001713 if (ret) {
1714 mlog_errno(ret);
1715 goto out;
1716 }
1717
Tao Ma293b2f72009-08-25 08:02:48 +08001718 ret = ocfs2_check_range_for_refcount(inode, pos, len);
1719 if (ret < 0) {
1720 mlog_errno(ret);
1721 goto out;
1722 } else if (ret == 1) {
Tao Ma50308d82010-11-04 15:14:11 +08001723 clusters_need = wc->w_clen;
Tao Ma15502712010-08-12 10:36:38 +08001724 ret = ocfs2_refcount_cow(inode, filp, di_bh,
Tao Ma37f8a2b2009-08-26 09:47:28 +08001725 wc->w_cpos, wc->w_clen, UINT_MAX);
Tao Ma293b2f72009-08-25 08:02:48 +08001726 if (ret) {
1727 mlog_errno(ret);
1728 goto out;
1729 }
1730 }
1731
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001732 ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc,
1733 &extents_to_split);
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001734 if (ret) {
1735 mlog_errno(ret);
1736 goto out;
1737 }
Tao Ma50308d82010-11-04 15:14:11 +08001738 clusters_need += clusters_to_alloc;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001739
1740 di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1741
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001742 /*
1743 * We set w_target_from, w_target_to here so that
1744 * ocfs2_write_end() knows which range in the target page to
1745 * write out. An allocation requires that we write the entire
1746 * cluster range.
1747 */
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001748 if (clusters_to_alloc || extents_to_split) {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001749 /*
1750 * XXX: We are stretching the limits of
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001751 * ocfs2_lock_allocators(). It greatly over-estimates
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001752 * the work to be done.
1753 */
Tao Mae7d4cb62008-08-18 17:38:44 +08001754 mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u,"
1755 " clusters_to_add = %u, extents_to_split = %u\n",
1756 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1757 (long long)i_size_read(inode), le32_to_cpu(di->i_clusters),
1758 clusters_to_alloc, extents_to_split);
1759
Joel Becker5e404e92009-02-13 03:54:22 -08001760 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
1761 wc->w_di_bh);
Joel Beckerf99b9b72008-08-20 19:36:33 -07001762 ret = ocfs2_lock_allocators(inode, &et,
Tao Ma231b87d2008-08-18 17:38:42 +08001763 clusters_to_alloc, extents_to_split,
Joel Beckerf99b9b72008-08-20 19:36:33 -07001764 &data_ac, &meta_ac);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001765 if (ret) {
1766 mlog_errno(ret);
Mark Fasheh607d44a2007-05-09 15:14:45 -07001767 goto out;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001768 }
1769
Mark Fasheh4fe370a2009-12-07 13:15:40 -08001770 if (data_ac)
1771 data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv;
1772
Tao Ma811f9332008-08-18 17:38:43 +08001773 credits = ocfs2_calc_extend_credits(inode->i_sb,
1774 &di->id2.i_list,
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001775 clusters_to_alloc);
1776
Mark Fasheh9517bac2007-02-09 20:24:12 -08001777 }
1778
Sunil Mushrane7432672009-08-06 16:12:58 -07001779 /*
1780 * We have to zero sparse allocated clusters, unwritten extent clusters,
1781 * and non-sparse clusters we just extended. For non-sparse writes,
1782 * we know zeros will only be needed in the first and/or last cluster.
1783 */
1784 if (clusters_to_alloc || extents_to_split ||
Sunil Mushran8379e7c2009-09-04 11:12:01 -07001785 (wc->w_clen && (wc->w_desc[0].c_needs_zero ||
1786 wc->w_desc[wc->w_clen - 1].c_needs_zero)))
Sunil Mushrane7432672009-08-06 16:12:58 -07001787 cluster_of_pages = 1;
1788 else
1789 cluster_of_pages = 0;
1790
1791 ocfs2_set_target_boundaries(osb, wc, pos, len, cluster_of_pages);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001792
Mark Fasheh9517bac2007-02-09 20:24:12 -08001793 handle = ocfs2_start_trans(osb, credits);
1794 if (IS_ERR(handle)) {
1795 ret = PTR_ERR(handle);
1796 mlog_errno(ret);
Mark Fasheh607d44a2007-05-09 15:14:45 -07001797 goto out;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001798 }
1799
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001800 wc->w_handle = handle;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001801
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001802 if (clusters_to_alloc) {
1803 ret = dquot_alloc_space_nodirty(inode,
1804 ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc));
1805 if (ret)
1806 goto out_commit;
Jan Karaa90714c2008-10-09 19:38:40 +02001807 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001808 /*
1809 * We don't want this to fail in ocfs2_write_end(), so do it
1810 * here.
1811 */
Joel Becker0cf2f762009-02-12 16:41:25 -08001812 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
Joel Becker13723d02008-10-17 19:25:01 -07001813 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001814 if (ret) {
1815 mlog_errno(ret);
Jan Karaa90714c2008-10-09 19:38:40 +02001816 goto out_quota;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001817 }
1818
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001819 /*
1820 * Fill our page array first. That way we've grabbed enough so
1821 * that we can zero and flush if we error after adding the
1822 * extent.
1823 */
Joel Becker693c2412010-07-02 17:20:27 -07001824 ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, len,
Sunil Mushrane7432672009-08-06 16:12:58 -07001825 cluster_of_pages, mmap_page);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001826 if (ret) {
Mark Fasheh9517bac2007-02-09 20:24:12 -08001827 mlog_errno(ret);
Jan Karaa90714c2008-10-09 19:38:40 +02001828 goto out_quota;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001829 }
Mark Fasheh9517bac2007-02-09 20:24:12 -08001830
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001831 ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos,
1832 len);
1833 if (ret) {
1834 mlog_errno(ret);
Jan Karaa90714c2008-10-09 19:38:40 +02001835 goto out_quota;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001836 }
1837
1838 if (data_ac)
1839 ocfs2_free_alloc_context(data_ac);
1840 if (meta_ac)
1841 ocfs2_free_alloc_context(meta_ac);
1842
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001843success:
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001844 *pagep = wc->w_target_page;
1845 *fsdata = wc;
1846 return 0;
Jan Karaa90714c2008-10-09 19:38:40 +02001847out_quota:
1848 if (clusters_to_alloc)
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001849 dquot_free_space(inode,
Jan Karaa90714c2008-10-09 19:38:40 +02001850 ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc));
Mark Fasheh9517bac2007-02-09 20:24:12 -08001851out_commit:
1852 ocfs2_commit_trans(osb, handle);
1853
Mark Fasheh9517bac2007-02-09 20:24:12 -08001854out:
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001855 ocfs2_free_write_ctxt(wc);
1856
Mark Fasheh9517bac2007-02-09 20:24:12 -08001857 if (data_ac)
1858 ocfs2_free_alloc_context(data_ac);
1859 if (meta_ac)
1860 ocfs2_free_alloc_context(meta_ac);
Tao Ma50308d82010-11-04 15:14:11 +08001861
1862 if (ret == -ENOSPC && try_free) {
1863 /*
1864 * Try to free some truncate log so that we can have enough
1865 * clusters to allocate.
1866 */
1867 try_free = 0;
1868
1869 ret1 = ocfs2_try_to_free_truncate_log(osb, clusters_need);
1870 if (ret1 == 1)
1871 goto try_again;
1872
1873 if (ret1 < 0)
1874 mlog_errno(ret1);
1875 }
1876
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001877 return ret;
1878}
Mark Fasheh9517bac2007-02-09 20:24:12 -08001879
Nick Pigginb6af1bc2007-10-16 01:25:24 -07001880static int ocfs2_write_begin(struct file *file, struct address_space *mapping,
1881 loff_t pos, unsigned len, unsigned flags,
1882 struct page **pagep, void **fsdata)
Mark Fasheh607d44a2007-05-09 15:14:45 -07001883{
1884 int ret;
1885 struct buffer_head *di_bh = NULL;
1886 struct inode *inode = mapping->host;
1887
Mark Fashehe63aecb62007-10-18 15:30:42 -07001888 ret = ocfs2_inode_lock(inode, &di_bh, 1);
Mark Fasheh607d44a2007-05-09 15:14:45 -07001889 if (ret) {
1890 mlog_errno(ret);
1891 return ret;
1892 }
1893
1894 /*
1895 * Take alloc sem here to prevent concurrent lookups. That way
1896 * the mapping, zeroing and tree manipulation within
1897 * ocfs2_write() will be safe against ->readpage(). This
1898 * should also serve to lock out allocation from a shared
1899 * writeable region.
1900 */
1901 down_write(&OCFS2_I(inode)->ip_alloc_sem);
1902
Tao Ma0378da0f2010-08-12 10:25:28 +08001903 ret = ocfs2_write_begin_nolock(file, mapping, pos, len, flags, pagep,
Mark Fasheh7307de82007-05-09 15:16:19 -07001904 fsdata, di_bh, NULL);
Mark Fasheh607d44a2007-05-09 15:14:45 -07001905 if (ret) {
1906 mlog_errno(ret);
Mark Fashehc934a922007-10-18 15:23:46 -07001907 goto out_fail;
Mark Fasheh607d44a2007-05-09 15:14:45 -07001908 }
1909
1910 brelse(di_bh);
1911
1912 return 0;
1913
Mark Fasheh607d44a2007-05-09 15:14:45 -07001914out_fail:
1915 up_write(&OCFS2_I(inode)->ip_alloc_sem);
1916
1917 brelse(di_bh);
Mark Fashehe63aecb62007-10-18 15:30:42 -07001918 ocfs2_inode_unlock(inode, 1);
Mark Fasheh607d44a2007-05-09 15:14:45 -07001919
1920 return ret;
1921}
1922
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001923static void ocfs2_write_end_inline(struct inode *inode, loff_t pos,
1924 unsigned len, unsigned *copied,
1925 struct ocfs2_dinode *di,
1926 struct ocfs2_write_ctxt *wc)
1927{
1928 void *kaddr;
1929
1930 if (unlikely(*copied < len)) {
1931 if (!PageUptodate(wc->w_target_page)) {
1932 *copied = 0;
1933 return;
1934 }
1935 }
1936
1937 kaddr = kmap_atomic(wc->w_target_page, KM_USER0);
1938 memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied);
1939 kunmap_atomic(kaddr, KM_USER0);
1940
1941 mlog(0, "Data written to inode at offset %llu. "
1942 "id_count = %u, copied = %u, i_dyn_features = 0x%x\n",
1943 (unsigned long long)pos, *copied,
1944 le16_to_cpu(di->id2.i_data.id_count),
1945 le16_to_cpu(di->i_dyn_features));
1946}
1947
Mark Fasheh7307de82007-05-09 15:16:19 -07001948int ocfs2_write_end_nolock(struct address_space *mapping,
1949 loff_t pos, unsigned len, unsigned copied,
1950 struct page *page, void *fsdata)
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001951{
1952 int i;
1953 unsigned from, to, start = pos & (PAGE_CACHE_SIZE - 1);
1954 struct inode *inode = mapping->host;
1955 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1956 struct ocfs2_write_ctxt *wc = fsdata;
1957 struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1958 handle_t *handle = wc->w_handle;
1959 struct page *tmppage;
1960
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001961 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1962 ocfs2_write_end_inline(inode, pos, len, &copied, di, wc);
1963 goto out_write_size;
1964 }
1965
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001966 if (unlikely(copied < len)) {
1967 if (!PageUptodate(wc->w_target_page))
1968 copied = 0;
1969
1970 ocfs2_zero_new_buffers(wc->w_target_page, start+copied,
1971 start+len);
1972 }
1973 flush_dcache_page(wc->w_target_page);
1974
1975 for(i = 0; i < wc->w_num_pages; i++) {
1976 tmppage = wc->w_pages[i];
1977
1978 if (tmppage == wc->w_target_page) {
1979 from = wc->w_target_from;
1980 to = wc->w_target_to;
1981
1982 BUG_ON(from > PAGE_CACHE_SIZE ||
1983 to > PAGE_CACHE_SIZE ||
1984 to < from);
1985 } else {
1986 /*
1987 * Pages adjacent to the target (if any) imply
1988 * a hole-filling write in which case we want
1989 * to flush their entire range.
1990 */
1991 from = 0;
1992 to = PAGE_CACHE_SIZE;
1993 }
1994
Sunil Mushran961cecb2008-07-16 17:22:22 -07001995 if (page_has_buffers(tmppage)) {
Mark Fasheh53ef99c2008-11-18 16:53:43 -08001996 if (ocfs2_should_order_data(inode))
Joel Becker2b4e30f2008-09-03 20:03:41 -07001997 ocfs2_jbd2_file_inode(wc->w_handle, inode);
Sunil Mushran961cecb2008-07-16 17:22:22 -07001998 block_commit_write(tmppage, from, to);
1999 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002000 }
2001
Mark Fasheh1afc32b2007-09-07 14:46:51 -07002002out_write_size:
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002003 pos += copied;
2004 if (pos > inode->i_size) {
2005 i_size_write(inode, pos);
2006 mark_inode_dirty(inode);
2007 }
2008 inode->i_blocks = ocfs2_inode_sector_count(inode);
2009 di->i_size = cpu_to_le64((u64)i_size_read(inode));
2010 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2011 di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
2012 di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002013 ocfs2_journal_dirty(handle, wc->w_di_bh);
2014
2015 ocfs2_commit_trans(osb, handle);
Mark Fasheh59a5e412007-06-22 15:52:36 -07002016
Mark Fashehb27b7cb2007-06-18 11:22:56 -07002017 ocfs2_run_deallocs(osb, &wc->w_dealloc);
2018
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002019 ocfs2_free_write_ctxt(wc);
2020
2021 return copied;
Mark Fasheh9517bac2007-02-09 20:24:12 -08002022}
2023
Nick Pigginb6af1bc2007-10-16 01:25:24 -07002024static int ocfs2_write_end(struct file *file, struct address_space *mapping,
2025 loff_t pos, unsigned len, unsigned copied,
2026 struct page *page, void *fsdata)
Mark Fasheh607d44a2007-05-09 15:14:45 -07002027{
2028 int ret;
2029 struct inode *inode = mapping->host;
2030
2031 ret = ocfs2_write_end_nolock(mapping, pos, len, copied, page, fsdata);
2032
Mark Fasheh607d44a2007-05-09 15:14:45 -07002033 up_write(&OCFS2_I(inode)->ip_alloc_sem);
Mark Fashehe63aecb62007-10-18 15:30:42 -07002034 ocfs2_inode_unlock(inode, 1);
Mark Fasheh607d44a2007-05-09 15:14:45 -07002035
2036 return ret;
2037}
2038
Christoph Hellwigf5e54d62006-06-28 04:26:44 -07002039const struct address_space_operations ocfs2_aops = {
Hisashi Hifumi1fca3a02009-03-05 17:22:21 +09002040 .readpage = ocfs2_readpage,
2041 .readpages = ocfs2_readpages,
2042 .writepage = ocfs2_writepage,
2043 .write_begin = ocfs2_write_begin,
2044 .write_end = ocfs2_write_end,
2045 .bmap = ocfs2_bmap,
2046 .sync_page = block_sync_page,
2047 .direct_IO = ocfs2_direct_IO,
2048 .invalidatepage = ocfs2_invalidatepage,
2049 .releasepage = ocfs2_releasepage,
2050 .migratepage = buffer_migrate_page,
2051 .is_partially_uptodate = block_is_partially_uptodate,
Andi Kleenaa261f52009-09-16 11:50:16 +02002052 .error_remove_page = generic_error_remove_page,
Mark Fashehccd979b2005-12-15 14:31:24 -08002053};