blob: f37d3c0e20535eacce542c7184f48d8b509884a2 [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
Mark Fashehccd979b2005-12-15 14:31:24 -080032#include <cluster/masklog.h>
33
34#include "ocfs2.h"
35
36#include "alloc.h"
37#include "aops.h"
38#include "dlmglue.h"
39#include "extent_map.h"
40#include "file.h"
41#include "inode.h"
42#include "journal.h"
Mark Fasheh9517bac2007-02-09 20:24:12 -080043#include "suballoc.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080044#include "super.h"
45#include "symlink.h"
Tao Ma293b2f72009-08-25 08:02:48 +080046#include "refcounttree.h"
Tao Ma95581562011-02-22 21:33:59 +080047#include "ocfs2_trace.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
Tao Ma95581562011-02-22 21:33:59 +080062 trace_ocfs2_symlink_get_block(
63 (unsigned long long)OCFS2_I(inode)->ip_blkno,
64 (unsigned long long)iblock, bh_result, create);
Mark Fashehccd979b2005-12-15 14:31:24 -080065
66 BUG_ON(ocfs2_inode_is_fast_symlink(inode));
67
68 if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) {
69 mlog(ML_ERROR, "block offset > PATH_MAX: %llu",
70 (unsigned long long)iblock);
71 goto bail;
72 }
73
Joel Beckerb657c952008-11-13 14:49:11 -080074 status = ocfs2_read_inode_block(inode, &bh);
Mark Fashehccd979b2005-12-15 14:31:24 -080075 if (status < 0) {
76 mlog_errno(status);
77 goto bail;
78 }
79 fe = (struct ocfs2_dinode *) bh->b_data;
80
Mark Fashehccd979b2005-12-15 14:31:24 -080081 if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb,
82 le32_to_cpu(fe->i_clusters))) {
83 mlog(ML_ERROR, "block offset is outside the allocated size: "
84 "%llu\n", (unsigned long long)iblock);
85 goto bail;
86 }
87
88 /* We don't use the page cache to create symlink data, so if
89 * need be, copy it over from the buffer cache. */
90 if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) {
91 u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) +
92 iblock;
93 buffer_cache_bh = sb_getblk(osb->sb, blkno);
94 if (!buffer_cache_bh) {
95 mlog(ML_ERROR, "couldn't getblock for symlink!\n");
96 goto bail;
97 }
98
99 /* we haven't locked out transactions, so a commit
100 * could've happened. Since we've got a reference on
101 * the bh, even if it commits while we're doing the
102 * copy, the data is still good. */
103 if (buffer_jbd(buffer_cache_bh)
104 && ocfs2_inode_is_new(inode)) {
Cong Wangc4bc8dc2011-11-25 23:14:34 +0800105 kaddr = kmap_atomic(bh_result->b_page);
Mark Fashehccd979b2005-12-15 14:31:24 -0800106 if (!kaddr) {
107 mlog(ML_ERROR, "couldn't kmap!\n");
108 goto bail;
109 }
110 memcpy(kaddr + (bh_result->b_size * iblock),
111 buffer_cache_bh->b_data,
112 bh_result->b_size);
Cong Wangc4bc8dc2011-11-25 23:14:34 +0800113 kunmap_atomic(kaddr);
Mark Fashehccd979b2005-12-15 14:31:24 -0800114 set_buffer_uptodate(bh_result);
115 }
116 brelse(buffer_cache_bh);
117 }
118
119 map_bh(bh_result, inode->i_sb,
120 le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock);
121
122 err = 0;
123
124bail:
Mark Fasheha81cb882008-10-07 14:25:16 -0700125 brelse(bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800126
Mark Fashehccd979b2005-12-15 14:31:24 -0800127 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
Tao Ma95581562011-02-22 21:33:59 +0800139 trace_ocfs2_get_block((unsigned long long)OCFS2_I(inode)->ip_blkno,
140 (unsigned long long)iblock, bh_result, create);
Mark Fashehccd979b2005-12-15 14:31:24 -0800141
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));
Tao Ma95581562011-02-22 21:33:59 +0800202
203 trace_ocfs2_get_block_end((unsigned long long)OCFS2_I(inode)->ip_blkno,
204 (unsigned long long)past_eof);
Joel Becker56934862010-07-01 15:13:31 -0700205 if (create && (iblock >= past_eof))
206 set_buffer_new(bh_result);
207
Mark Fashehccd979b2005-12-15 14:31:24 -0800208bail:
209 if (err < 0)
210 err = -EIO;
211
Mark Fashehccd979b2005-12-15 14:31:24 -0800212 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
Cong Wangc4bc8dc2011-11-25 23:14:34 +0800239 kaddr = kmap_atomic(page);
Mark Fasheh6798d352007-09-07 14:05:51 -0700240 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);
Cong Wangc4bc8dc2011-11-25 23:14:34 +0800245 kunmap_atomic(kaddr);
Mark Fasheh6798d352007-09-07 14:05:51 -0700246
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
Tao Ma95581562011-02-22 21:33:59 +0800281 trace_ocfs2_readpage((unsigned long long)oi->ip_blkno,
282 (page ? page->index : 0));
Mark Fashehccd979b2005-12-15 14:31:24 -0800283
Mark Fashehe63aecb62007-10-18 15:30:42 -0700284 ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page);
Mark Fashehccd979b2005-12-15 14:31:24 -0800285 if (ret != 0) {
286 if (ret == AOP_TRUNCATED_PAGE)
287 unlock = 0;
288 mlog_errno(ret);
289 goto out;
290 }
291
Mark Fasheh6798d352007-09-07 14:05:51 -0700292 if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
Jan Karac7e25e62011-06-23 22:51:47 +0200293 /*
294 * Unlock the page and cycle ip_alloc_sem so that we don't
295 * busyloop waiting for ip_alloc_sem to unlock
296 */
Mark Fashehe9dfc0b2007-05-14 11:38:51 -0700297 ret = AOP_TRUNCATED_PAGE;
Jan Karac7e25e62011-06-23 22:51:47 +0200298 unlock_page(page);
299 unlock = 0;
300 down_read(&oi->ip_alloc_sem);
301 up_read(&oi->ip_alloc_sem);
Mark Fashehe63aecb62007-10-18 15:30:42 -0700302 goto out_inode_unlock;
Mark Fashehe9dfc0b2007-05-14 11:38:51 -0700303 }
Mark Fashehccd979b2005-12-15 14:31:24 -0800304
305 /*
306 * i_size might have just been updated as we grabed the meta lock. We
307 * might now be discovering a truncate that hit on another node.
308 * block_read_full_page->get_block freaks out if it is asked to read
309 * beyond the end of a file, so we check here. Callers
Nick Piggin54cb8822007-07-19 01:46:59 -0700310 * (generic_file_read, vm_ops->fault) are clever enough to check i_size
Mark Fashehccd979b2005-12-15 14:31:24 -0800311 * and notice that the page they just read isn't needed.
312 *
313 * XXX sys_readahead() seems to get that wrong?
314 */
315 if (start >= i_size_read(inode)) {
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800316 zero_user(page, 0, PAGE_SIZE);
Mark Fashehccd979b2005-12-15 14:31:24 -0800317 SetPageUptodate(page);
318 ret = 0;
319 goto out_alloc;
320 }
321
Mark Fasheh6798d352007-09-07 14:05:51 -0700322 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
323 ret = ocfs2_readpage_inline(inode, page);
324 else
325 ret = block_read_full_page(page, ocfs2_get_block);
Mark Fashehccd979b2005-12-15 14:31:24 -0800326 unlock = 0;
327
Mark Fashehccd979b2005-12-15 14:31:24 -0800328out_alloc:
329 up_read(&OCFS2_I(inode)->ip_alloc_sem);
Mark Fashehe63aecb62007-10-18 15:30:42 -0700330out_inode_unlock:
331 ocfs2_inode_unlock(inode, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -0800332out:
333 if (unlock)
334 unlock_page(page);
Mark Fashehccd979b2005-12-15 14:31:24 -0800335 return ret;
336}
337
Mark Fasheh628a24f2007-10-30 12:08:32 -0700338/*
339 * This is used only for read-ahead. Failures or difficult to handle
340 * situations are safe to ignore.
341 *
342 * Right now, we don't bother with BH_Boundary - in-inode extent lists
343 * are quite large (243 extents on 4k blocks), so most inodes don't
344 * grow out to a tree. If need be, detecting boundary extents could
345 * trivially be added in a future version of ocfs2_get_block().
346 */
347static int ocfs2_readpages(struct file *filp, struct address_space *mapping,
348 struct list_head *pages, unsigned nr_pages)
349{
350 int ret, err = -EIO;
351 struct inode *inode = mapping->host;
352 struct ocfs2_inode_info *oi = OCFS2_I(inode);
353 loff_t start;
354 struct page *last;
355
356 /*
357 * Use the nonblocking flag for the dlm code to avoid page
358 * lock inversion, but don't bother with retrying.
359 */
360 ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK);
361 if (ret)
362 return err;
363
364 if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
365 ocfs2_inode_unlock(inode, 0);
366 return err;
367 }
368
369 /*
370 * Don't bother with inline-data. There isn't anything
371 * to read-ahead in that case anyway...
372 */
373 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
374 goto out_unlock;
375
376 /*
377 * Check whether a remote node truncated this file - we just
378 * drop out in that case as it's not worth handling here.
379 */
380 last = list_entry(pages->prev, struct page, lru);
381 start = (loff_t)last->index << PAGE_CACHE_SHIFT;
382 if (start >= i_size_read(inode))
383 goto out_unlock;
384
385 err = mpage_readpages(mapping, pages, nr_pages, ocfs2_get_block);
386
387out_unlock:
388 up_read(&oi->ip_alloc_sem);
389 ocfs2_inode_unlock(inode, 0);
390
391 return err;
392}
393
Mark Fashehccd979b2005-12-15 14:31:24 -0800394/* Note: Because we don't support holes, our allocation has
395 * already happened (allocation writes zeros to the file data)
396 * so we don't have to worry about ordered writes in
397 * ocfs2_writepage.
398 *
399 * ->writepage is called during the process of invalidating the page cache
400 * during blocked lock processing. It can't block on any cluster locks
401 * to during block mapping. It's relying on the fact that the block
402 * mapping can't have disappeared under the dirty pages that it is
403 * being asked to write back.
404 */
405static int ocfs2_writepage(struct page *page, struct writeback_control *wbc)
406{
Tao Ma95581562011-02-22 21:33:59 +0800407 trace_ocfs2_writepage(
408 (unsigned long long)OCFS2_I(page->mapping->host)->ip_blkno,
409 page->index);
Mark Fashehccd979b2005-12-15 14:31:24 -0800410
Tao Ma95581562011-02-22 21:33:59 +0800411 return block_write_full_page(page, ocfs2_get_block, wbc);
Mark Fashehccd979b2005-12-15 14:31:24 -0800412}
413
Mark Fashehccd979b2005-12-15 14:31:24 -0800414/* Taken from ext3. We don't necessarily need the full blown
415 * functionality yet, but IMHO it's better to cut and paste the whole
416 * thing so we can avoid introducing our own bugs (and easily pick up
417 * their fixes when they happen) --Mark */
Mark Fasheh60b11392007-02-16 11:46:50 -0800418int walk_page_buffers( handle_t *handle,
419 struct buffer_head *head,
420 unsigned from,
421 unsigned to,
422 int *partial,
423 int (*fn)( handle_t *handle,
424 struct buffer_head *bh))
Mark Fashehccd979b2005-12-15 14:31:24 -0800425{
426 struct buffer_head *bh;
427 unsigned block_start, block_end;
428 unsigned blocksize = head->b_size;
429 int err, ret = 0;
430 struct buffer_head *next;
431
432 for ( bh = head, block_start = 0;
433 ret == 0 && (bh != head || !block_start);
434 block_start = block_end, bh = next)
435 {
436 next = bh->b_this_page;
437 block_end = block_start + blocksize;
438 if (block_end <= from || block_start >= to) {
439 if (partial && !buffer_uptodate(bh))
440 *partial = 1;
441 continue;
442 }
443 err = (*fn)(handle, bh);
444 if (!ret)
445 ret = err;
446 }
447 return ret;
448}
449
Mark Fashehccd979b2005-12-15 14:31:24 -0800450static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block)
451{
452 sector_t status;
453 u64 p_blkno = 0;
454 int err = 0;
455 struct inode *inode = mapping->host;
456
Tao Ma95581562011-02-22 21:33:59 +0800457 trace_ocfs2_bmap((unsigned long long)OCFS2_I(inode)->ip_blkno,
458 (unsigned long long)block);
Mark Fashehccd979b2005-12-15 14:31:24 -0800459
460 /* We don't need to lock journal system files, since they aren't
461 * accessed concurrently from multiple nodes.
462 */
463 if (!INODE_JOURNAL(inode)) {
Mark Fashehe63aecb62007-10-18 15:30:42 -0700464 err = ocfs2_inode_lock(inode, NULL, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -0800465 if (err) {
466 if (err != -ENOENT)
467 mlog_errno(err);
468 goto bail;
469 }
470 down_read(&OCFS2_I(inode)->ip_alloc_sem);
471 }
472
Mark Fasheh6798d352007-09-07 14:05:51 -0700473 if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
474 err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL,
475 NULL);
Mark Fashehccd979b2005-12-15 14:31:24 -0800476
477 if (!INODE_JOURNAL(inode)) {
478 up_read(&OCFS2_I(inode)->ip_alloc_sem);
Mark Fashehe63aecb62007-10-18 15:30:42 -0700479 ocfs2_inode_unlock(inode, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -0800480 }
481
482 if (err) {
483 mlog(ML_ERROR, "get_blocks() failed, block = %llu\n",
484 (unsigned long long)block);
485 mlog_errno(err);
486 goto bail;
487 }
488
Mark Fashehccd979b2005-12-15 14:31:24 -0800489bail:
490 status = err ? 0 : p_blkno;
491
Mark Fashehccd979b2005-12-15 14:31:24 -0800492 return status;
493}
494
495/*
496 * TODO: Make this into a generic get_blocks function.
497 *
498 * From do_direct_io in direct-io.c:
499 * "So what we do is to permit the ->get_blocks function to populate
500 * bh.b_size with the size of IO which is permitted at this offset and
501 * this i_blkbits."
502 *
503 * This function is called directly from get_more_blocks in direct-io.c.
504 *
505 * called like this: dio->get_blocks(dio->inode, fs_startblk,
506 * fs_count, map_bh, dio->rw == WRITE);
Christoph Hellwig5fe878a2009-12-15 16:47:50 -0800507 *
508 * Note that we never bother to allocate blocks here, and thus ignore the
509 * create argument.
Mark Fashehccd979b2005-12-15 14:31:24 -0800510 */
511static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
Mark Fashehccd979b2005-12-15 14:31:24 -0800512 struct buffer_head *bh_result, int create)
513{
514 int ret;
Mark Fasheh4f902c32007-03-09 16:26:50 -0800515 u64 p_blkno, inode_blocks, contig_blocks;
Mark Fasheh49cb8d22007-03-09 16:21:46 -0800516 unsigned int ext_flags;
Florin Malita184d7d22006-06-03 19:30:10 -0400517 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -0800518 unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
Mark Fashehccd979b2005-12-15 14:31:24 -0800519
Mark Fashehccd979b2005-12-15 14:31:24 -0800520 /* This function won't even be called if the request isn't all
521 * nicely aligned and of the right size, so there's no need
522 * for us to check any of that. */
523
Mark Fasheh25baf2d2007-02-14 15:30:30 -0800524 inode_blocks = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
Mark Fasheh564f8a32006-12-14 13:01:05 -0800525
Mark Fashehccd979b2005-12-15 14:31:24 -0800526 /* This figures out the size of the next contiguous block, and
527 * our logical offset */
Mark Fasheh363041a2007-01-17 12:31:35 -0800528 ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno,
Mark Fasheh49cb8d22007-03-09 16:21:46 -0800529 &contig_blocks, &ext_flags);
Mark Fashehccd979b2005-12-15 14:31:24 -0800530 if (ret) {
531 mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n",
532 (unsigned long long)iblock);
533 ret = -EIO;
534 goto bail;
535 }
536
Tao Macbaee472010-02-26 10:54:52 +0800537 /* We should already CoW the refcounted extent in case of create. */
538 BUG_ON(create && (ext_flags & OCFS2_EXT_REFCOUNTED));
539
Mark Fasheh25baf2d2007-02-14 15:30:30 -0800540 /*
541 * get_more_blocks() expects us to describe a hole by clearing
542 * the mapped bit on bh_result().
Mark Fasheh49cb8d22007-03-09 16:21:46 -0800543 *
544 * Consider an unwritten extent as a hole.
Mark Fasheh25baf2d2007-02-14 15:30:30 -0800545 */
Mark Fasheh49cb8d22007-03-09 16:21:46 -0800546 if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN))
Mark Fasheh25baf2d2007-02-14 15:30:30 -0800547 map_bh(bh_result, inode->i_sb, p_blkno);
Christoph Hellwig5fe878a2009-12-15 16:47:50 -0800548 else
Mark Fasheh25baf2d2007-02-14 15:30:30 -0800549 clear_buffer_mapped(bh_result);
Mark Fashehccd979b2005-12-15 14:31:24 -0800550
551 /* make sure we don't map more than max_blocks blocks here as
552 that's all the kernel will handle at this point. */
553 if (max_blocks < contig_blocks)
554 contig_blocks = max_blocks;
555 bh_result->b_size = contig_blocks << blocksize_bits;
556bail:
557 return ret;
558}
559
Sunil Mushran2bd63212010-01-25 16:57:38 -0800560/*
Mark Fashehccd979b2005-12-15 14:31:24 -0800561 * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're
Christoph Hellwigbd5fe6c2011-06-24 14:29:43 -0400562 * particularly interested in the aio/dio case. We use the rw_lock DLM lock
563 * to protect io on one node from truncation on another.
Mark Fashehccd979b2005-12-15 14:31:24 -0800564 */
565static void ocfs2_dio_end_io(struct kiocb *iocb,
566 loff_t offset,
567 ssize_t bytes,
Christoph Hellwig7b7a8662013-09-04 15:04:39 +0200568 void *private)
Mark Fashehccd979b2005-12-15 14:31:24 -0800569{
Al Viro496ad9a2013-01-23 17:07:38 -0500570 struct inode *inode = file_inode(iocb->ki_filp);
Mark Fasheh7cdfc3a2007-04-16 17:28:51 -0700571 int level;
Mark Fasheha11f7e62011-06-22 14:23:38 -0700572 wait_queue_head_t *wq = ocfs2_ioend_wq(inode);
Mark Fashehccd979b2005-12-15 14:31:24 -0800573
574 /* this io's submitter should not have unlocked this before we could */
575 BUG_ON(!ocfs2_iocb_is_rw_locked(iocb));
Mark Fasheh7cdfc3a2007-04-16 17:28:51 -0700576
Christoph Hellwigdf2d6f22011-06-24 14:29:46 -0400577 if (ocfs2_iocb_is_sem_locked(iocb))
Tristan Ye39c99f12010-12-07 14:35:07 +0800578 ocfs2_iocb_clear_sem_locked(iocb);
Tristan Ye39c99f12010-12-07 14:35:07 +0800579
Mark Fasheha11f7e62011-06-22 14:23:38 -0700580 if (ocfs2_iocb_is_unaligned_aio(iocb)) {
581 ocfs2_iocb_clear_unaligned_aio(iocb);
582
583 if (atomic_dec_and_test(&OCFS2_I(inode)->ip_unaligned_aio) &&
584 waitqueue_active(wq)) {
585 wake_up_all(wq);
586 }
587 }
588
Mark Fashehccd979b2005-12-15 14:31:24 -0800589 ocfs2_iocb_clear_rw_locked(iocb);
Mark Fasheh7cdfc3a2007-04-16 17:28:51 -0700590
591 level = ocfs2_iocb_rw_locked_level(iocb);
Mark Fasheh7cdfc3a2007-04-16 17:28:51 -0700592 ocfs2_rw_unlock(inode, level);
Mark Fashehccd979b2005-12-15 14:31:24 -0800593}
594
Joel Becker03f981c2007-01-04 14:54:41 -0800595/*
596 * ocfs2_invalidatepage() and ocfs2_releasepage() are shamelessly stolen
597 * from ext3. PageChecked() bits have been removed as OCFS2 does not
598 * do journalled data.
599 */
Lukas Czernerd47992f2013-05-21 23:17:23 -0400600static void ocfs2_invalidatepage(struct page *page, unsigned int offset,
601 unsigned int length)
Joel Becker03f981c2007-01-04 14:54:41 -0800602{
603 journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
604
Lukas Czernere5f8d302013-05-21 23:58:46 -0400605 jbd2_journal_invalidatepage(journal, page, offset, length);
Joel Becker03f981c2007-01-04 14:54:41 -0800606}
607
608static int ocfs2_releasepage(struct page *page, gfp_t wait)
609{
610 journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
611
612 if (!page_has_buffers(page))
613 return 0;
Joel Becker2b4e30f2008-09-03 20:03:41 -0700614 return jbd2_journal_try_to_free_buffers(journal, page, wait);
Joel Becker03f981c2007-01-04 14:54:41 -0800615}
616
Mark Fashehccd979b2005-12-15 14:31:24 -0800617static ssize_t ocfs2_direct_IO(int rw,
618 struct kiocb *iocb,
619 const struct iovec *iov,
620 loff_t offset,
621 unsigned long nr_segs)
622{
623 struct file *file = iocb->ki_filp;
Al Viro496ad9a2013-01-23 17:07:38 -0500624 struct inode *inode = file_inode(file)->i_mapping->host;
Mark Fasheh53013cb2006-05-05 19:04:03 -0700625
Mark Fasheh6798d352007-09-07 14:05:51 -0700626 /*
627 * Fallback to buffered I/O if we see an inode without
628 * extents.
629 */
630 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
631 return 0;
632
Tao Mab80474b2009-09-10 15:28:47 +0800633 /* Fallback to buffered I/O if we are appending. */
634 if (i_size_read(inode) <= offset)
635 return 0;
636
Tao Mac1e8d352011-03-07 16:43:21 +0800637 return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev,
638 iov, offset, nr_segs,
639 ocfs2_direct_IO_get_blocks,
640 ocfs2_dio_end_io, NULL, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -0800641}
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
Cong Wangc4bc8dc2011-11-25 23:14:34 +0800687 kaddr = kmap_atomic(page);
Mark Fasheh9517bac2007-02-09 20:24:12 -0800688
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
Cong Wangc4bc8dc2011-11-25 23:14:34 +0800698 kunmap_atomic(kaddr);
Mark Fasheh9517bac2007-02-09 20:24:12 -0800699}
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 /*
Wengang Wang5cffff92011-07-24 10:36:54 -0700879 * w_target_locked is used for page_mkwrite path indicating no unlocking
880 * against w_target_page in ocfs2_write_end_nolock.
881 */
882 unsigned int w_target_locked:1;
883
884 /*
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700885 * ocfs2_write_end() uses this to know what the real range to
886 * write in the target should be.
887 */
888 unsigned int w_target_from;
889 unsigned int w_target_to;
890
891 /*
892 * We could use journal_current_handle() but this is cleaner,
893 * IMHO -Mark
894 */
895 handle_t *w_handle;
896
897 struct buffer_head *w_di_bh;
Mark Fashehb27b7cb2007-06-18 11:22:56 -0700898
899 struct ocfs2_cached_dealloc_ctxt w_dealloc;
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700900};
901
Mark Fasheh1d410a62007-09-07 14:20:45 -0700902void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages)
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700903{
904 int i;
905
Mark Fasheh1d410a62007-09-07 14:20:45 -0700906 for(i = 0; i < num_pages; i++) {
907 if (pages[i]) {
908 unlock_page(pages[i]);
909 mark_page_accessed(pages[i]);
910 page_cache_release(pages[i]);
911 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700912 }
Mark Fasheh1d410a62007-09-07 14:20:45 -0700913}
914
915static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt *wc)
916{
Wengang Wang5cffff92011-07-24 10:36:54 -0700917 int i;
918
919 /*
920 * w_target_locked is only set to true in the page_mkwrite() case.
921 * The intent is to allow us to lock the target page from write_begin()
922 * to write_end(). The caller must hold a ref on w_target_page.
923 */
924 if (wc->w_target_locked) {
925 BUG_ON(!wc->w_target_page);
926 for (i = 0; i < wc->w_num_pages; i++) {
927 if (wc->w_target_page == wc->w_pages[i]) {
928 wc->w_pages[i] = NULL;
929 break;
930 }
931 }
932 mark_page_accessed(wc->w_target_page);
933 page_cache_release(wc->w_target_page);
934 }
Mark Fasheh1d410a62007-09-07 14:20:45 -0700935 ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages);
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700936
937 brelse(wc->w_di_bh);
938 kfree(wc);
939}
940
941static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp,
942 struct ocfs2_super *osb, loff_t pos,
Mark Fasheh607d44a2007-05-09 15:14:45 -0700943 unsigned len, struct buffer_head *di_bh)
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700944{
tao.ma@oracle.com30b85482007-09-06 08:02:25 +0800945 u32 cend;
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700946 struct ocfs2_write_ctxt *wc;
947
948 wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS);
949 if (!wc)
950 return -ENOMEM;
951
952 wc->w_cpos = pos >> osb->s_clustersize_bits;
Sunil Mushrane7432672009-08-06 16:12:58 -0700953 wc->w_first_new_cpos = UINT_MAX;
tao.ma@oracle.com30b85482007-09-06 08:02:25 +0800954 cend = (pos + len - 1) >> osb->s_clustersize_bits;
955 wc->w_clen = cend - wc->w_cpos + 1;
Mark Fasheh607d44a2007-05-09 15:14:45 -0700956 get_bh(di_bh);
957 wc->w_di_bh = di_bh;
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700958
959 if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits))
960 wc->w_large_pages = 1;
961 else
962 wc->w_large_pages = 0;
963
Mark Fashehb27b7cb2007-06-18 11:22:56 -0700964 ocfs2_init_dealloc_ctxt(&wc->w_dealloc);
965
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700966 *wcp = wc;
967
968 return 0;
Mark Fasheh9517bac2007-02-09 20:24:12 -0800969}
970
971/*
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700972 * If a page has any new buffers, zero them out here, and mark them uptodate
973 * and dirty so they'll be written out (in order to prevent uninitialised
974 * block data from leaking). And clear the new bit.
Mark Fasheh9517bac2007-02-09 20:24:12 -0800975 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700976static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to)
Mark Fasheh9517bac2007-02-09 20:24:12 -0800977{
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700978 unsigned int block_start, block_end;
979 struct buffer_head *head, *bh;
Mark Fasheh9517bac2007-02-09 20:24:12 -0800980
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700981 BUG_ON(!PageLocked(page));
982 if (!page_has_buffers(page))
983 return;
984
985 bh = head = page_buffers(page);
986 block_start = 0;
987 do {
988 block_end = block_start + bh->b_size;
989
990 if (buffer_new(bh)) {
991 if (block_end > from && block_start < to) {
992 if (!PageUptodate(page)) {
993 unsigned start, end;
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700994
995 start = max(from, block_start);
996 end = min(to, block_end);
997
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800998 zero_user_segment(page, start, end);
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700999 set_buffer_uptodate(bh);
1000 }
1001
1002 clear_buffer_new(bh);
1003 mark_buffer_dirty(bh);
1004 }
1005 }
1006
1007 block_start = block_end;
1008 bh = bh->b_this_page;
1009 } while (bh != head);
1010}
1011
1012/*
1013 * Only called when we have a failure during allocating write to write
1014 * zero's to the newly allocated region.
1015 */
1016static void ocfs2_write_failure(struct inode *inode,
1017 struct ocfs2_write_ctxt *wc,
1018 loff_t user_pos, unsigned user_len)
1019{
1020 int i;
Mark Fasheh5c26a7b2007-09-18 17:49:29 -07001021 unsigned from = user_pos & (PAGE_CACHE_SIZE - 1),
1022 to = user_pos + user_len;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001023 struct page *tmppage;
1024
Mark Fasheh5c26a7b2007-09-18 17:49:29 -07001025 ocfs2_zero_new_buffers(wc->w_target_page, from, to);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001026
1027 for(i = 0; i < wc->w_num_pages; i++) {
1028 tmppage = wc->w_pages[i];
1029
Sunil Mushran961cecb2008-07-16 17:22:22 -07001030 if (page_has_buffers(tmppage)) {
Mark Fasheh53ef99c2008-11-18 16:53:43 -08001031 if (ocfs2_should_order_data(inode))
Joel Becker2b4e30f2008-09-03 20:03:41 -07001032 ocfs2_jbd2_file_inode(wc->w_handle, inode);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001033
Sunil Mushran961cecb2008-07-16 17:22:22 -07001034 block_commit_write(tmppage, from, to);
1035 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001036 }
1037}
1038
1039static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno,
1040 struct ocfs2_write_ctxt *wc,
1041 struct page *page, u32 cpos,
1042 loff_t user_pos, unsigned user_len,
1043 int new)
1044{
1045 int ret;
1046 unsigned int map_from = 0, map_to = 0;
1047 unsigned int cluster_start, cluster_end;
1048 unsigned int user_data_from = 0, user_data_to = 0;
1049
1050 ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos,
Mark Fasheh9517bac2007-02-09 20:24:12 -08001051 &cluster_start, &cluster_end);
1052
Goldwyn Rodrigues272b62c2011-02-17 09:44:40 -06001053 /* treat the write as new if the a hole/lseek spanned across
1054 * the page boundary.
1055 */
1056 new = new | ((i_size_read(inode) <= page_offset(page)) &&
1057 (page_offset(page) <= user_pos));
1058
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001059 if (page == wc->w_target_page) {
1060 map_from = user_pos & (PAGE_CACHE_SIZE - 1);
1061 map_to = map_from + user_len;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001062
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001063 if (new)
1064 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
1065 cluster_start, cluster_end,
1066 new);
1067 else
1068 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
1069 map_from, map_to, new);
1070 if (ret) {
Mark Fasheh9517bac2007-02-09 20:24:12 -08001071 mlog_errno(ret);
1072 goto out;
1073 }
1074
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001075 user_data_from = map_from;
1076 user_data_to = map_to;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001077 if (new) {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001078 map_from = cluster_start;
1079 map_to = cluster_end;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001080 }
1081 } else {
1082 /*
1083 * If we haven't allocated the new page yet, we
1084 * shouldn't be writing it out without copying user
1085 * data. This is likely a math error from the caller.
1086 */
1087 BUG_ON(!new);
1088
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001089 map_from = cluster_start;
1090 map_to = cluster_end;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001091
1092 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001093 cluster_start, cluster_end, new);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001094 if (ret) {
1095 mlog_errno(ret);
1096 goto out;
1097 }
1098 }
1099
1100 /*
1101 * Parts of newly allocated pages need to be zero'd.
1102 *
1103 * Above, we have also rewritten 'to' and 'from' - as far as
1104 * the rest of the function is concerned, the entire cluster
1105 * range inside of a page needs to be written.
1106 *
1107 * We can skip this if the page is up to date - it's already
1108 * been zero'd from being read in as a hole.
1109 */
1110 if (new && !PageUptodate(page))
1111 ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb),
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001112 cpos, user_data_from, user_data_to);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001113
1114 flush_dcache_page(page);
1115
Mark Fasheh9517bac2007-02-09 20:24:12 -08001116out:
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001117 return ret;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001118}
1119
1120/*
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001121 * This function will only grab one clusters worth of pages.
Mark Fasheh9517bac2007-02-09 20:24:12 -08001122 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001123static int ocfs2_grab_pages_for_write(struct address_space *mapping,
1124 struct ocfs2_write_ctxt *wc,
Joel Becker693c2412010-07-02 17:20:27 -07001125 u32 cpos, loff_t user_pos,
1126 unsigned user_len, int new,
Mark Fasheh7307de82007-05-09 15:16:19 -07001127 struct page *mmap_page)
Mark Fasheh9517bac2007-02-09 20:24:12 -08001128{
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001129 int ret = 0, i;
Joel Becker693c2412010-07-02 17:20:27 -07001130 unsigned long start, target_index, end_index, index;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001131 struct inode *inode = mapping->host;
Joel Becker693c2412010-07-02 17:20:27 -07001132 loff_t last_byte;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001133
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001134 target_index = user_pos >> PAGE_CACHE_SHIFT;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001135
1136 /*
1137 * Figure out how many pages we'll be manipulating here. For
Mark Fasheh60b11392007-02-16 11:46:50 -08001138 * non allocating write, we just change the one
Joel Becker693c2412010-07-02 17:20:27 -07001139 * page. Otherwise, we'll need a whole clusters worth. If we're
1140 * writing past i_size, we only need enough pages to cover the
1141 * last page of the write.
Mark Fasheh9517bac2007-02-09 20:24:12 -08001142 */
Mark Fasheh9517bac2007-02-09 20:24:12 -08001143 if (new) {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001144 wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb);
1145 start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos);
Joel Becker693c2412010-07-02 17:20:27 -07001146 /*
1147 * We need the index *past* the last page we could possibly
1148 * touch. This is the page past the end of the write or
1149 * i_size, whichever is greater.
1150 */
1151 last_byte = max(user_pos + user_len, i_size_read(inode));
1152 BUG_ON(last_byte < 1);
1153 end_index = ((last_byte - 1) >> PAGE_CACHE_SHIFT) + 1;
1154 if ((start + wc->w_num_pages) > end_index)
1155 wc->w_num_pages = end_index - start;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001156 } else {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001157 wc->w_num_pages = 1;
1158 start = target_index;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001159 }
1160
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001161 for(i = 0; i < wc->w_num_pages; i++) {
Mark Fasheh9517bac2007-02-09 20:24:12 -08001162 index = start + i;
1163
Mark Fasheh7307de82007-05-09 15:16:19 -07001164 if (index == target_index && mmap_page) {
1165 /*
1166 * ocfs2_pagemkwrite() is a little different
1167 * and wants us to directly use the page
1168 * passed in.
1169 */
1170 lock_page(mmap_page);
1171
Wengang Wang5cffff92011-07-24 10:36:54 -07001172 /* Exit and let the caller retry */
Mark Fasheh7307de82007-05-09 15:16:19 -07001173 if (mmap_page->mapping != mapping) {
Wengang Wang5cffff92011-07-24 10:36:54 -07001174 WARN_ON(mmap_page->mapping);
Mark Fasheh7307de82007-05-09 15:16:19 -07001175 unlock_page(mmap_page);
Wengang Wang5cffff92011-07-24 10:36:54 -07001176 ret = -EAGAIN;
Mark Fasheh7307de82007-05-09 15:16:19 -07001177 goto out;
1178 }
1179
1180 page_cache_get(mmap_page);
1181 wc->w_pages[i] = mmap_page;
Wengang Wang5cffff92011-07-24 10:36:54 -07001182 wc->w_target_locked = true;
Mark Fasheh7307de82007-05-09 15:16:19 -07001183 } else {
1184 wc->w_pages[i] = find_or_create_page(mapping, index,
1185 GFP_NOFS);
1186 if (!wc->w_pages[i]) {
1187 ret = -ENOMEM;
1188 mlog_errno(ret);
1189 goto out;
1190 }
Mark Fasheh9517bac2007-02-09 20:24:12 -08001191 }
Jan Kara12695292013-02-21 16:42:57 -08001192 wait_for_stable_page(wc->w_pages[i]);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001193
1194 if (index == target_index)
1195 wc->w_target_page = wc->w_pages[i];
Mark Fasheh9517bac2007-02-09 20:24:12 -08001196 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001197out:
Wengang Wang5cffff92011-07-24 10:36:54 -07001198 if (ret)
1199 wc->w_target_locked = false;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001200 return ret;
1201}
1202
1203/*
1204 * Prepare a single cluster for write one cluster into the file.
1205 */
1206static int ocfs2_write_cluster(struct address_space *mapping,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001207 u32 phys, unsigned int unwritten,
Sunil Mushrane7432672009-08-06 16:12:58 -07001208 unsigned int should_zero,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001209 struct ocfs2_alloc_context *data_ac,
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001210 struct ocfs2_alloc_context *meta_ac,
1211 struct ocfs2_write_ctxt *wc, u32 cpos,
1212 loff_t user_pos, unsigned user_len)
1213{
Sunil Mushrane7432672009-08-06 16:12:58 -07001214 int ret, i, new;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001215 u64 v_blkno, p_blkno;
1216 struct inode *inode = mapping->host;
Joel Beckerf99b9b72008-08-20 19:36:33 -07001217 struct ocfs2_extent_tree et;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001218
1219 new = phys == 0 ? 1 : 0;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001220 if (new) {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001221 u32 tmp_pos;
1222
Mark Fasheh9517bac2007-02-09 20:24:12 -08001223 /*
1224 * This is safe to call with the page locks - it won't take
1225 * any additional semaphores or cluster locks.
1226 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001227 tmp_pos = cpos;
Tao Ma0eb8d472008-08-18 17:38:45 +08001228 ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode,
1229 &tmp_pos, 1, 0, wc->w_di_bh,
1230 wc->w_handle, data_ac,
1231 meta_ac, NULL);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001232 /*
1233 * This shouldn't happen because we must have already
1234 * calculated the correct meta data allocation required. The
1235 * internal tree allocation code should know how to increase
1236 * transaction credits itself.
1237 *
1238 * If need be, we could handle -EAGAIN for a
1239 * RESTART_TRANS here.
1240 */
1241 mlog_bug_on_msg(ret == -EAGAIN,
1242 "Inode %llu: EAGAIN return during allocation.\n",
1243 (unsigned long long)OCFS2_I(inode)->ip_blkno);
1244 if (ret < 0) {
1245 mlog_errno(ret);
1246 goto out;
1247 }
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001248 } else if (unwritten) {
Joel Becker5e404e92009-02-13 03:54:22 -08001249 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
1250 wc->w_di_bh);
Joel Beckerf99b9b72008-08-20 19:36:33 -07001251 ret = ocfs2_mark_extent_written(inode, &et,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001252 wc->w_handle, cpos, 1, phys,
Joel Beckerf99b9b72008-08-20 19:36:33 -07001253 meta_ac, &wc->w_dealloc);
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001254 if (ret < 0) {
1255 mlog_errno(ret);
1256 goto out;
1257 }
Mark Fasheh9517bac2007-02-09 20:24:12 -08001258 }
1259
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001260 if (should_zero)
1261 v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, cpos);
1262 else
1263 v_blkno = user_pos >> inode->i_sb->s_blocksize_bits;
1264
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001265 /*
1266 * The only reason this should fail is due to an inability to
1267 * find the extent added.
1268 */
Mark Fasheh49cb8d22007-03-09 16:21:46 -08001269 ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL,
1270 NULL);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001271 if (ret < 0) {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001272 ocfs2_error(inode->i_sb, "Corrupting extend for inode %llu, "
1273 "at logical block %llu",
1274 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1275 (unsigned long long)v_blkno);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001276 goto out;
1277 }
1278
1279 BUG_ON(p_blkno == 0);
1280
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001281 for(i = 0; i < wc->w_num_pages; i++) {
1282 int tmpret;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001283
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001284 tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc,
1285 wc->w_pages[i], cpos,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001286 user_pos, user_len,
1287 should_zero);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001288 if (tmpret) {
1289 mlog_errno(tmpret);
1290 if (ret == 0)
Wengang Wangcbfa9632009-07-13 11:38:23 +08001291 ret = tmpret;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001292 }
Mark Fasheh9517bac2007-02-09 20:24:12 -08001293 }
1294
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001295 /*
1296 * We only have cleanup to do in case of allocating write.
1297 */
1298 if (ret && new)
1299 ocfs2_write_failure(inode, wc, user_pos, user_len);
1300
Mark Fasheh9517bac2007-02-09 20:24:12 -08001301out:
Mark Fasheh9517bac2007-02-09 20:24:12 -08001302
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001303 return ret;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001304}
1305
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001306static int ocfs2_write_cluster_by_desc(struct address_space *mapping,
1307 struct ocfs2_alloc_context *data_ac,
1308 struct ocfs2_alloc_context *meta_ac,
1309 struct ocfs2_write_ctxt *wc,
1310 loff_t pos, unsigned len)
1311{
1312 int ret, i;
Mark Fashehdb562462007-09-17 09:06:29 -07001313 loff_t cluster_off;
1314 unsigned int local_len = len;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001315 struct ocfs2_write_cluster_desc *desc;
Mark Fashehdb562462007-09-17 09:06:29 -07001316 struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb);
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001317
1318 for (i = 0; i < wc->w_clen; i++) {
1319 desc = &wc->w_desc[i];
1320
Mark Fashehdb562462007-09-17 09:06:29 -07001321 /*
1322 * We have to make sure that the total write passed in
1323 * doesn't extend past a single cluster.
1324 */
1325 local_len = len;
1326 cluster_off = pos & (osb->s_clustersize - 1);
1327 if ((cluster_off + local_len) > osb->s_clustersize)
1328 local_len = osb->s_clustersize - cluster_off;
1329
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001330 ret = ocfs2_write_cluster(mapping, desc->c_phys,
Sunil Mushrane7432672009-08-06 16:12:58 -07001331 desc->c_unwritten,
1332 desc->c_needs_zero,
1333 data_ac, meta_ac,
Mark Fashehdb562462007-09-17 09:06:29 -07001334 wc, desc->c_cpos, pos, local_len);
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001335 if (ret) {
1336 mlog_errno(ret);
1337 goto out;
1338 }
Mark Fashehdb562462007-09-17 09:06:29 -07001339
1340 len -= local_len;
1341 pos += local_len;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001342 }
1343
1344 ret = 0;
1345out:
1346 return ret;
1347}
1348
Mark Fasheh9517bac2007-02-09 20:24:12 -08001349/*
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001350 * ocfs2_write_end() wants to know which parts of the target page it
1351 * should complete the write on. It's easiest to compute them ahead of
1352 * time when a more complete view of the write is available.
Mark Fasheh9517bac2007-02-09 20:24:12 -08001353 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001354static void ocfs2_set_target_boundaries(struct ocfs2_super *osb,
1355 struct ocfs2_write_ctxt *wc,
1356 loff_t pos, unsigned len, int alloc)
Mark Fasheh9517bac2007-02-09 20:24:12 -08001357{
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001358 struct ocfs2_write_cluster_desc *desc;
1359
1360 wc->w_target_from = pos & (PAGE_CACHE_SIZE - 1);
1361 wc->w_target_to = wc->w_target_from + len;
1362
1363 if (alloc == 0)
1364 return;
1365
1366 /*
1367 * Allocating write - we may have different boundaries based
1368 * on page size and cluster size.
1369 *
1370 * NOTE: We can no longer compute one value from the other as
1371 * the actual write length and user provided length may be
1372 * different.
1373 */
1374
1375 if (wc->w_large_pages) {
1376 /*
1377 * We only care about the 1st and last cluster within
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001378 * our range and whether they should be zero'd or not. Either
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001379 * value may be extended out to the start/end of a
1380 * newly allocated cluster.
1381 */
1382 desc = &wc->w_desc[0];
Sunil Mushrane7432672009-08-06 16:12:58 -07001383 if (desc->c_needs_zero)
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001384 ocfs2_figure_cluster_boundaries(osb,
1385 desc->c_cpos,
1386 &wc->w_target_from,
1387 NULL);
1388
1389 desc = &wc->w_desc[wc->w_clen - 1];
Sunil Mushrane7432672009-08-06 16:12:58 -07001390 if (desc->c_needs_zero)
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001391 ocfs2_figure_cluster_boundaries(osb,
1392 desc->c_cpos,
1393 NULL,
1394 &wc->w_target_to);
1395 } else {
1396 wc->w_target_from = 0;
1397 wc->w_target_to = PAGE_CACHE_SIZE;
1398 }
1399}
1400
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001401/*
1402 * Populate each single-cluster write descriptor in the write context
1403 * with information about the i/o to be done.
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001404 *
1405 * Returns the number of clusters that will have to be allocated, as
1406 * well as a worst case estimate of the number of extent records that
1407 * would have to be created during a write to an unwritten region.
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001408 */
1409static int ocfs2_populate_write_desc(struct inode *inode,
1410 struct ocfs2_write_ctxt *wc,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001411 unsigned int *clusters_to_alloc,
1412 unsigned int *extents_to_split)
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001413{
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001414 int ret;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001415 struct ocfs2_write_cluster_desc *desc;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001416 unsigned int num_clusters = 0;
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001417 unsigned int ext_flags = 0;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001418 u32 phys = 0;
1419 int i;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001420
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001421 *clusters_to_alloc = 0;
1422 *extents_to_split = 0;
1423
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001424 for (i = 0; i < wc->w_clen; i++) {
1425 desc = &wc->w_desc[i];
1426 desc->c_cpos = wc->w_cpos + i;
1427
1428 if (num_clusters == 0) {
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001429 /*
1430 * Need to look up the next extent record.
1431 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001432 ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001433 &num_clusters, &ext_flags);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001434 if (ret) {
1435 mlog_errno(ret);
Mark Fasheh607d44a2007-05-09 15:14:45 -07001436 goto out;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001437 }
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001438
Tao Ma293b2f72009-08-25 08:02:48 +08001439 /* We should already CoW the refcountd extent. */
1440 BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1441
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001442 /*
1443 * Assume worst case - that we're writing in
1444 * the middle of the extent.
1445 *
1446 * We can assume that the write proceeds from
1447 * left to right, in which case the extent
1448 * insert code is smart enough to coalesce the
1449 * next splits into the previous records created.
1450 */
1451 if (ext_flags & OCFS2_EXT_UNWRITTEN)
1452 *extents_to_split = *extents_to_split + 2;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001453 } else if (phys) {
1454 /*
1455 * Only increment phys if it doesn't describe
1456 * a hole.
1457 */
1458 phys++;
1459 }
1460
Sunil Mushrane7432672009-08-06 16:12:58 -07001461 /*
1462 * If w_first_new_cpos is < UINT_MAX, we have a non-sparse
1463 * file that got extended. w_first_new_cpos tells us
1464 * where the newly allocated clusters are so we can
1465 * zero them.
1466 */
1467 if (desc->c_cpos >= wc->w_first_new_cpos) {
1468 BUG_ON(phys == 0);
1469 desc->c_needs_zero = 1;
1470 }
1471
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001472 desc->c_phys = phys;
1473 if (phys == 0) {
1474 desc->c_new = 1;
Sunil Mushrane7432672009-08-06 16:12:58 -07001475 desc->c_needs_zero = 1;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001476 *clusters_to_alloc = *clusters_to_alloc + 1;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001477 }
Sunil Mushrane7432672009-08-06 16:12:58 -07001478
1479 if (ext_flags & OCFS2_EXT_UNWRITTEN) {
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001480 desc->c_unwritten = 1;
Sunil Mushrane7432672009-08-06 16:12:58 -07001481 desc->c_needs_zero = 1;
1482 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001483
1484 num_clusters--;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001485 }
1486
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001487 ret = 0;
1488out:
1489 return ret;
1490}
1491
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001492static int ocfs2_write_begin_inline(struct address_space *mapping,
1493 struct inode *inode,
1494 struct ocfs2_write_ctxt *wc)
1495{
1496 int ret;
1497 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1498 struct page *page;
1499 handle_t *handle;
1500 struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1501
1502 page = find_or_create_page(mapping, 0, GFP_NOFS);
1503 if (!page) {
1504 ret = -ENOMEM;
1505 mlog_errno(ret);
1506 goto out;
1507 }
1508 /*
1509 * If we don't set w_num_pages then this page won't get unlocked
1510 * and freed on cleanup of the write context.
1511 */
1512 wc->w_pages[0] = wc->w_target_page = page;
1513 wc->w_num_pages = 1;
1514
1515 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1516 if (IS_ERR(handle)) {
1517 ret = PTR_ERR(handle);
1518 mlog_errno(ret);
1519 goto out;
1520 }
1521
Joel Becker0cf2f762009-02-12 16:41:25 -08001522 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
Joel Becker13723d02008-10-17 19:25:01 -07001523 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001524 if (ret) {
1525 ocfs2_commit_trans(osb, handle);
1526
1527 mlog_errno(ret);
1528 goto out;
1529 }
1530
1531 if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
1532 ocfs2_set_inode_data_inline(inode, di);
1533
1534 if (!PageUptodate(page)) {
1535 ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh);
1536 if (ret) {
1537 ocfs2_commit_trans(osb, handle);
1538
1539 goto out;
1540 }
1541 }
1542
1543 wc->w_handle = handle;
1544out:
1545 return ret;
1546}
1547
1548int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size)
1549{
1550 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1551
Mark Fasheh0d8a4e02007-11-20 11:48:41 -08001552 if (new_size <= le16_to_cpu(di->id2.i_data.id_count))
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001553 return 1;
1554 return 0;
1555}
1556
1557static int ocfs2_try_to_write_inline_data(struct address_space *mapping,
1558 struct inode *inode, loff_t pos,
1559 unsigned len, struct page *mmap_page,
1560 struct ocfs2_write_ctxt *wc)
1561{
1562 int ret, written = 0;
1563 loff_t end = pos + len;
1564 struct ocfs2_inode_info *oi = OCFS2_I(inode);
Tiger Yangd9ae49d2009-03-05 11:06:15 +08001565 struct ocfs2_dinode *di = NULL;
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001566
Tao Ma95581562011-02-22 21:33:59 +08001567 trace_ocfs2_try_to_write_inline_data((unsigned long long)oi->ip_blkno,
1568 len, (unsigned long long)pos,
1569 oi->ip_dyn_features);
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001570
1571 /*
1572 * Handle inodes which already have inline data 1st.
1573 */
1574 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1575 if (mmap_page == NULL &&
1576 ocfs2_size_fits_inline_data(wc->w_di_bh, end))
1577 goto do_inline_write;
1578
1579 /*
1580 * The write won't fit - we have to give this inode an
1581 * inline extent list now.
1582 */
1583 ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh);
1584 if (ret)
1585 mlog_errno(ret);
1586 goto out;
1587 }
1588
1589 /*
1590 * Check whether the inode can accept inline data.
1591 */
1592 if (oi->ip_clusters != 0 || i_size_read(inode) != 0)
1593 return 0;
1594
1595 /*
1596 * Check whether the write can fit.
1597 */
Tiger Yangd9ae49d2009-03-05 11:06:15 +08001598 di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1599 if (mmap_page ||
1600 end > ocfs2_max_inline_data_with_xattr(inode->i_sb, di))
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001601 return 0;
1602
1603do_inline_write:
1604 ret = ocfs2_write_begin_inline(mapping, inode, wc);
1605 if (ret) {
1606 mlog_errno(ret);
1607 goto out;
1608 }
1609
1610 /*
1611 * This signals to the caller that the data can be written
1612 * inline.
1613 */
1614 written = 1;
1615out:
1616 return written ? written : ret;
1617}
1618
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001619/*
1620 * This function only does anything for file systems which can't
1621 * handle sparse files.
1622 *
1623 * What we want to do here is fill in any hole between the current end
1624 * of allocation and the end of our write. That way the rest of the
1625 * write path can treat it as an non-allocating write, which has no
1626 * special case code for sparse/nonsparse files.
1627 */
Joel Becker56934862010-07-01 15:13:31 -07001628static int ocfs2_expand_nonsparse_inode(struct inode *inode,
1629 struct buffer_head *di_bh,
1630 loff_t pos, unsigned len,
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001631 struct ocfs2_write_ctxt *wc)
1632{
1633 int ret;
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001634 loff_t newsize = pos + len;
1635
Joel Becker56934862010-07-01 15:13:31 -07001636 BUG_ON(ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)));
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001637
1638 if (newsize <= i_size_read(inode))
1639 return 0;
1640
Joel Becker56934862010-07-01 15:13:31 -07001641 ret = ocfs2_extend_no_holes(inode, di_bh, newsize, pos);
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001642 if (ret)
1643 mlog_errno(ret);
1644
Sunil Mushrane7432672009-08-06 16:12:58 -07001645 wc->w_first_new_cpos =
1646 ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode));
1647
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001648 return ret;
1649}
1650
Joel Becker56934862010-07-01 15:13:31 -07001651static int ocfs2_zero_tail(struct inode *inode, struct buffer_head *di_bh,
1652 loff_t pos)
1653{
1654 int ret = 0;
1655
1656 BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)));
1657 if (pos > i_size_read(inode))
1658 ret = ocfs2_zero_extend(inode, di_bh, pos);
1659
1660 return ret;
1661}
1662
Tao Ma50308d82010-11-04 15:14:11 +08001663/*
1664 * Try to flush truncate logs if we can free enough clusters from it.
1665 * As for return value, "< 0" means error, "0" no space and "1" means
1666 * we have freed enough spaces and let the caller try to allocate again.
1667 */
1668static int ocfs2_try_to_free_truncate_log(struct ocfs2_super *osb,
1669 unsigned int needed)
1670{
1671 tid_t target;
1672 int ret = 0;
1673 unsigned int truncated_clusters;
1674
1675 mutex_lock(&osb->osb_tl_inode->i_mutex);
1676 truncated_clusters = osb->truncated_clusters;
1677 mutex_unlock(&osb->osb_tl_inode->i_mutex);
1678
1679 /*
1680 * Check whether we can succeed in allocating if we free
1681 * the truncate log.
1682 */
1683 if (truncated_clusters < needed)
1684 goto out;
1685
1686 ret = ocfs2_flush_truncate_log(osb);
1687 if (ret) {
1688 mlog_errno(ret);
1689 goto out;
1690 }
1691
1692 if (jbd2_journal_start_commit(osb->journal->j_journal, &target)) {
1693 jbd2_log_wait_commit(osb->journal->j_journal, target);
1694 ret = 1;
1695 }
1696out:
1697 return ret;
1698}
1699
Tao Ma0378da0f2010-08-12 10:25:28 +08001700int ocfs2_write_begin_nolock(struct file *filp,
1701 struct address_space *mapping,
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001702 loff_t pos, unsigned len, unsigned flags,
1703 struct page **pagep, void **fsdata,
1704 struct buffer_head *di_bh, struct page *mmap_page)
1705{
Sunil Mushrane7432672009-08-06 16:12:58 -07001706 int ret, cluster_of_pages, credits = OCFS2_INODE_UPDATE_CREDITS;
Tao Ma50308d82010-11-04 15:14:11 +08001707 unsigned int clusters_to_alloc, extents_to_split, clusters_need = 0;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001708 struct ocfs2_write_ctxt *wc;
1709 struct inode *inode = mapping->host;
1710 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1711 struct ocfs2_dinode *di;
1712 struct ocfs2_alloc_context *data_ac = NULL;
1713 struct ocfs2_alloc_context *meta_ac = NULL;
1714 handle_t *handle;
Joel Beckerf99b9b72008-08-20 19:36:33 -07001715 struct ocfs2_extent_tree et;
Tao Ma50308d82010-11-04 15:14:11 +08001716 int try_free = 1, ret1;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001717
Tao Ma50308d82010-11-04 15:14:11 +08001718try_again:
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001719 ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh);
1720 if (ret) {
1721 mlog_errno(ret);
1722 return ret;
1723 }
1724
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001725 if (ocfs2_supports_inline_data(osb)) {
1726 ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len,
1727 mmap_page, wc);
1728 if (ret == 1) {
1729 ret = 0;
1730 goto success;
1731 }
1732 if (ret < 0) {
1733 mlog_errno(ret);
1734 goto out;
1735 }
1736 }
1737
Joel Becker56934862010-07-01 15:13:31 -07001738 if (ocfs2_sparse_alloc(osb))
1739 ret = ocfs2_zero_tail(inode, di_bh, pos);
1740 else
1741 ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos, len,
1742 wc);
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001743 if (ret) {
1744 mlog_errno(ret);
1745 goto out;
1746 }
1747
Tao Ma293b2f72009-08-25 08:02:48 +08001748 ret = ocfs2_check_range_for_refcount(inode, pos, len);
1749 if (ret < 0) {
1750 mlog_errno(ret);
1751 goto out;
1752 } else if (ret == 1) {
Tao Ma50308d82010-11-04 15:14:11 +08001753 clusters_need = wc->w_clen;
Tiger Yangc7dd3392013-08-13 16:00:58 -07001754 ret = ocfs2_refcount_cow(inode, di_bh,
Tao Ma37f8a2b2009-08-26 09:47:28 +08001755 wc->w_cpos, wc->w_clen, UINT_MAX);
Tao Ma293b2f72009-08-25 08:02:48 +08001756 if (ret) {
1757 mlog_errno(ret);
1758 goto out;
1759 }
1760 }
1761
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001762 ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc,
1763 &extents_to_split);
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001764 if (ret) {
1765 mlog_errno(ret);
1766 goto out;
1767 }
Tao Ma50308d82010-11-04 15:14:11 +08001768 clusters_need += clusters_to_alloc;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001769
1770 di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1771
Tao Ma95581562011-02-22 21:33:59 +08001772 trace_ocfs2_write_begin_nolock(
1773 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1774 (long long)i_size_read(inode),
1775 le32_to_cpu(di->i_clusters),
1776 pos, len, flags, mmap_page,
1777 clusters_to_alloc, extents_to_split);
1778
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001779 /*
1780 * We set w_target_from, w_target_to here so that
1781 * ocfs2_write_end() knows which range in the target page to
1782 * write out. An allocation requires that we write the entire
1783 * cluster range.
1784 */
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001785 if (clusters_to_alloc || extents_to_split) {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001786 /*
1787 * XXX: We are stretching the limits of
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001788 * ocfs2_lock_allocators(). It greatly over-estimates
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001789 * the work to be done.
1790 */
Joel Becker5e404e92009-02-13 03:54:22 -08001791 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
1792 wc->w_di_bh);
Joel Beckerf99b9b72008-08-20 19:36:33 -07001793 ret = ocfs2_lock_allocators(inode, &et,
Tao Ma231b87d2008-08-18 17:38:42 +08001794 clusters_to_alloc, extents_to_split,
Joel Beckerf99b9b72008-08-20 19:36:33 -07001795 &data_ac, &meta_ac);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001796 if (ret) {
1797 mlog_errno(ret);
Mark Fasheh607d44a2007-05-09 15:14:45 -07001798 goto out;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001799 }
1800
Mark Fasheh4fe370a2009-12-07 13:15:40 -08001801 if (data_ac)
1802 data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv;
1803
Tao Ma811f9332008-08-18 17:38:43 +08001804 credits = ocfs2_calc_extend_credits(inode->i_sb,
1805 &di->id2.i_list,
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001806 clusters_to_alloc);
1807
Mark Fasheh9517bac2007-02-09 20:24:12 -08001808 }
1809
Sunil Mushrane7432672009-08-06 16:12:58 -07001810 /*
1811 * We have to zero sparse allocated clusters, unwritten extent clusters,
1812 * and non-sparse clusters we just extended. For non-sparse writes,
1813 * we know zeros will only be needed in the first and/or last cluster.
1814 */
1815 if (clusters_to_alloc || extents_to_split ||
Sunil Mushran8379e7c2009-09-04 11:12:01 -07001816 (wc->w_clen && (wc->w_desc[0].c_needs_zero ||
1817 wc->w_desc[wc->w_clen - 1].c_needs_zero)))
Sunil Mushrane7432672009-08-06 16:12:58 -07001818 cluster_of_pages = 1;
1819 else
1820 cluster_of_pages = 0;
1821
1822 ocfs2_set_target_boundaries(osb, wc, pos, len, cluster_of_pages);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001823
Mark Fasheh9517bac2007-02-09 20:24:12 -08001824 handle = ocfs2_start_trans(osb, credits);
1825 if (IS_ERR(handle)) {
1826 ret = PTR_ERR(handle);
1827 mlog_errno(ret);
Mark Fasheh607d44a2007-05-09 15:14:45 -07001828 goto out;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001829 }
1830
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001831 wc->w_handle = handle;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001832
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001833 if (clusters_to_alloc) {
1834 ret = dquot_alloc_space_nodirty(inode,
1835 ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc));
1836 if (ret)
1837 goto out_commit;
Jan Karaa90714c2008-10-09 19:38:40 +02001838 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001839 /*
1840 * We don't want this to fail in ocfs2_write_end(), so do it
1841 * here.
1842 */
Joel Becker0cf2f762009-02-12 16:41:25 -08001843 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
Joel Becker13723d02008-10-17 19:25:01 -07001844 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001845 if (ret) {
1846 mlog_errno(ret);
Jan Karaa90714c2008-10-09 19:38:40 +02001847 goto out_quota;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001848 }
1849
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001850 /*
1851 * Fill our page array first. That way we've grabbed enough so
1852 * that we can zero and flush if we error after adding the
1853 * extent.
1854 */
Joel Becker693c2412010-07-02 17:20:27 -07001855 ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, len,
Sunil Mushrane7432672009-08-06 16:12:58 -07001856 cluster_of_pages, mmap_page);
Wengang Wang5cffff92011-07-24 10:36:54 -07001857 if (ret && ret != -EAGAIN) {
Mark Fasheh9517bac2007-02-09 20:24:12 -08001858 mlog_errno(ret);
Jan Karaa90714c2008-10-09 19:38:40 +02001859 goto out_quota;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001860 }
Mark Fasheh9517bac2007-02-09 20:24:12 -08001861
Wengang Wang5cffff92011-07-24 10:36:54 -07001862 /*
1863 * ocfs2_grab_pages_for_write() returns -EAGAIN if it could not lock
1864 * the target page. In this case, we exit with no error and no target
1865 * page. This will trigger the caller, page_mkwrite(), to re-try
1866 * the operation.
1867 */
1868 if (ret == -EAGAIN) {
1869 BUG_ON(wc->w_target_page);
1870 ret = 0;
1871 goto out_quota;
1872 }
1873
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001874 ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos,
1875 len);
1876 if (ret) {
1877 mlog_errno(ret);
Jan Karaa90714c2008-10-09 19:38:40 +02001878 goto out_quota;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001879 }
1880
1881 if (data_ac)
1882 ocfs2_free_alloc_context(data_ac);
1883 if (meta_ac)
1884 ocfs2_free_alloc_context(meta_ac);
1885
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001886success:
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001887 *pagep = wc->w_target_page;
1888 *fsdata = wc;
1889 return 0;
Jan Karaa90714c2008-10-09 19:38:40 +02001890out_quota:
1891 if (clusters_to_alloc)
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001892 dquot_free_space(inode,
Jan Karaa90714c2008-10-09 19:38:40 +02001893 ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc));
Mark Fasheh9517bac2007-02-09 20:24:12 -08001894out_commit:
1895 ocfs2_commit_trans(osb, handle);
1896
Mark Fasheh9517bac2007-02-09 20:24:12 -08001897out:
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001898 ocfs2_free_write_ctxt(wc);
1899
Mark Fasheh9517bac2007-02-09 20:24:12 -08001900 if (data_ac)
1901 ocfs2_free_alloc_context(data_ac);
1902 if (meta_ac)
1903 ocfs2_free_alloc_context(meta_ac);
Tao Ma50308d82010-11-04 15:14:11 +08001904
1905 if (ret == -ENOSPC && try_free) {
1906 /*
1907 * Try to free some truncate log so that we can have enough
1908 * clusters to allocate.
1909 */
1910 try_free = 0;
1911
1912 ret1 = ocfs2_try_to_free_truncate_log(osb, clusters_need);
1913 if (ret1 == 1)
1914 goto try_again;
1915
1916 if (ret1 < 0)
1917 mlog_errno(ret1);
1918 }
1919
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001920 return ret;
1921}
Mark Fasheh9517bac2007-02-09 20:24:12 -08001922
Nick Pigginb6af1bc2007-10-16 01:25:24 -07001923static int ocfs2_write_begin(struct file *file, struct address_space *mapping,
1924 loff_t pos, unsigned len, unsigned flags,
1925 struct page **pagep, void **fsdata)
Mark Fasheh607d44a2007-05-09 15:14:45 -07001926{
1927 int ret;
1928 struct buffer_head *di_bh = NULL;
1929 struct inode *inode = mapping->host;
1930
Mark Fashehe63aecb62007-10-18 15:30:42 -07001931 ret = ocfs2_inode_lock(inode, &di_bh, 1);
Mark Fasheh607d44a2007-05-09 15:14:45 -07001932 if (ret) {
1933 mlog_errno(ret);
1934 return ret;
1935 }
1936
1937 /*
1938 * Take alloc sem here to prevent concurrent lookups. That way
1939 * the mapping, zeroing and tree manipulation within
1940 * ocfs2_write() will be safe against ->readpage(). This
1941 * should also serve to lock out allocation from a shared
1942 * writeable region.
1943 */
1944 down_write(&OCFS2_I(inode)->ip_alloc_sem);
1945
Tao Ma0378da0f2010-08-12 10:25:28 +08001946 ret = ocfs2_write_begin_nolock(file, mapping, pos, len, flags, pagep,
Mark Fasheh7307de82007-05-09 15:16:19 -07001947 fsdata, di_bh, NULL);
Mark Fasheh607d44a2007-05-09 15:14:45 -07001948 if (ret) {
1949 mlog_errno(ret);
Mark Fashehc934a922007-10-18 15:23:46 -07001950 goto out_fail;
Mark Fasheh607d44a2007-05-09 15:14:45 -07001951 }
1952
1953 brelse(di_bh);
1954
1955 return 0;
1956
Mark Fasheh607d44a2007-05-09 15:14:45 -07001957out_fail:
1958 up_write(&OCFS2_I(inode)->ip_alloc_sem);
1959
1960 brelse(di_bh);
Mark Fashehe63aecb62007-10-18 15:30:42 -07001961 ocfs2_inode_unlock(inode, 1);
Mark Fasheh607d44a2007-05-09 15:14:45 -07001962
1963 return ret;
1964}
1965
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001966static void ocfs2_write_end_inline(struct inode *inode, loff_t pos,
1967 unsigned len, unsigned *copied,
1968 struct ocfs2_dinode *di,
1969 struct ocfs2_write_ctxt *wc)
1970{
1971 void *kaddr;
1972
1973 if (unlikely(*copied < len)) {
1974 if (!PageUptodate(wc->w_target_page)) {
1975 *copied = 0;
1976 return;
1977 }
1978 }
1979
Cong Wangc4bc8dc2011-11-25 23:14:34 +08001980 kaddr = kmap_atomic(wc->w_target_page);
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001981 memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied);
Cong Wangc4bc8dc2011-11-25 23:14:34 +08001982 kunmap_atomic(kaddr);
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001983
Tao Ma95581562011-02-22 21:33:59 +08001984 trace_ocfs2_write_end_inline(
1985 (unsigned long long)OCFS2_I(inode)->ip_blkno,
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001986 (unsigned long long)pos, *copied,
1987 le16_to_cpu(di->id2.i_data.id_count),
1988 le16_to_cpu(di->i_dyn_features));
1989}
1990
Mark Fasheh7307de82007-05-09 15:16:19 -07001991int ocfs2_write_end_nolock(struct address_space *mapping,
1992 loff_t pos, unsigned len, unsigned copied,
1993 struct page *page, void *fsdata)
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001994{
1995 int i;
1996 unsigned from, to, start = pos & (PAGE_CACHE_SIZE - 1);
1997 struct inode *inode = mapping->host;
1998 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1999 struct ocfs2_write_ctxt *wc = fsdata;
2000 struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
2001 handle_t *handle = wc->w_handle;
2002 struct page *tmppage;
2003
Mark Fasheh1afc32b2007-09-07 14:46:51 -07002004 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2005 ocfs2_write_end_inline(inode, pos, len, &copied, di, wc);
2006 goto out_write_size;
2007 }
2008
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002009 if (unlikely(copied < len)) {
2010 if (!PageUptodate(wc->w_target_page))
2011 copied = 0;
2012
2013 ocfs2_zero_new_buffers(wc->w_target_page, start+copied,
2014 start+len);
2015 }
2016 flush_dcache_page(wc->w_target_page);
2017
2018 for(i = 0; i < wc->w_num_pages; i++) {
2019 tmppage = wc->w_pages[i];
2020
2021 if (tmppage == wc->w_target_page) {
2022 from = wc->w_target_from;
2023 to = wc->w_target_to;
2024
2025 BUG_ON(from > PAGE_CACHE_SIZE ||
2026 to > PAGE_CACHE_SIZE ||
2027 to < from);
2028 } else {
2029 /*
2030 * Pages adjacent to the target (if any) imply
2031 * a hole-filling write in which case we want
2032 * to flush their entire range.
2033 */
2034 from = 0;
2035 to = PAGE_CACHE_SIZE;
2036 }
2037
Sunil Mushran961cecb2008-07-16 17:22:22 -07002038 if (page_has_buffers(tmppage)) {
Mark Fasheh53ef99c2008-11-18 16:53:43 -08002039 if (ocfs2_should_order_data(inode))
Joel Becker2b4e30f2008-09-03 20:03:41 -07002040 ocfs2_jbd2_file_inode(wc->w_handle, inode);
Sunil Mushran961cecb2008-07-16 17:22:22 -07002041 block_commit_write(tmppage, from, to);
2042 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002043 }
2044
Mark Fasheh1afc32b2007-09-07 14:46:51 -07002045out_write_size:
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002046 pos += copied;
Junxiao Bif17c20d2013-09-11 14:19:45 -07002047 if (pos > i_size_read(inode)) {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002048 i_size_write(inode, pos);
2049 mark_inode_dirty(inode);
2050 }
2051 inode->i_blocks = ocfs2_inode_sector_count(inode);
2052 di->i_size = cpu_to_le64((u64)i_size_read(inode));
2053 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2054 di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
2055 di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002056 ocfs2_journal_dirty(handle, wc->w_di_bh);
2057
2058 ocfs2_commit_trans(osb, handle);
Mark Fasheh59a5e412007-06-22 15:52:36 -07002059
Mark Fashehb27b7cb2007-06-18 11:22:56 -07002060 ocfs2_run_deallocs(osb, &wc->w_dealloc);
2061
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002062 ocfs2_free_write_ctxt(wc);
2063
2064 return copied;
Mark Fasheh9517bac2007-02-09 20:24:12 -08002065}
2066
Nick Pigginb6af1bc2007-10-16 01:25:24 -07002067static int ocfs2_write_end(struct file *file, struct address_space *mapping,
2068 loff_t pos, unsigned len, unsigned copied,
2069 struct page *page, void *fsdata)
Mark Fasheh607d44a2007-05-09 15:14:45 -07002070{
2071 int ret;
2072 struct inode *inode = mapping->host;
2073
2074 ret = ocfs2_write_end_nolock(mapping, pos, len, copied, page, fsdata);
2075
Mark Fasheh607d44a2007-05-09 15:14:45 -07002076 up_write(&OCFS2_I(inode)->ip_alloc_sem);
Mark Fashehe63aecb62007-10-18 15:30:42 -07002077 ocfs2_inode_unlock(inode, 1);
Mark Fasheh607d44a2007-05-09 15:14:45 -07002078
2079 return ret;
2080}
2081
Christoph Hellwigf5e54d62006-06-28 04:26:44 -07002082const struct address_space_operations ocfs2_aops = {
Hisashi Hifumi1fca3a02009-03-05 17:22:21 +09002083 .readpage = ocfs2_readpage,
2084 .readpages = ocfs2_readpages,
2085 .writepage = ocfs2_writepage,
2086 .write_begin = ocfs2_write_begin,
2087 .write_end = ocfs2_write_end,
2088 .bmap = ocfs2_bmap,
Hisashi Hifumi1fca3a02009-03-05 17:22:21 +09002089 .direct_IO = ocfs2_direct_IO,
2090 .invalidatepage = ocfs2_invalidatepage,
2091 .releasepage = ocfs2_releasepage,
2092 .migratepage = buffer_migrate_page,
2093 .is_partially_uptodate = block_is_partially_uptodate,
Andi Kleenaa261f52009-09-16 11:50:16 +02002094 .error_remove_page = generic_error_remove_page,
Mark Fashehccd979b2005-12-15 14:31:24 -08002095};