blob: 657743254eb90079666eaab73723de0a1bc4ed51 [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 Fashehb0697052006-03-03 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 Hellwig40e2e972010-07-18 21:17:09 +0000568 void *private,
569 int ret,
570 bool is_async)
Mark Fashehccd979b2005-12-15 14:31:24 -0800571{
Josef Sipekd28c9172006-12-08 02:37:25 -0800572 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
Mark Fasheh7cdfc3a2007-04-16 17:28:51 -0700573 int level;
Mark Fasheha11f7e62011-06-22 14:23:38 -0700574 wait_queue_head_t *wq = ocfs2_ioend_wq(inode);
Mark Fashehccd979b2005-12-15 14:31:24 -0800575
576 /* this io's submitter should not have unlocked this before we could */
577 BUG_ON(!ocfs2_iocb_is_rw_locked(iocb));
Mark Fasheh7cdfc3a2007-04-16 17:28:51 -0700578
Christoph Hellwigdf2d6f22011-06-24 14:29:46 -0400579 if (ocfs2_iocb_is_sem_locked(iocb))
Tristan Ye39c99f12010-12-07 14:35:07 +0800580 ocfs2_iocb_clear_sem_locked(iocb);
Tristan Ye39c99f12010-12-07 14:35:07 +0800581
Mark Fasheha11f7e62011-06-22 14:23:38 -0700582 if (ocfs2_iocb_is_unaligned_aio(iocb)) {
583 ocfs2_iocb_clear_unaligned_aio(iocb);
584
585 if (atomic_dec_and_test(&OCFS2_I(inode)->ip_unaligned_aio) &&
586 waitqueue_active(wq)) {
587 wake_up_all(wq);
588 }
589 }
590
Mark Fashehccd979b2005-12-15 14:31:24 -0800591 ocfs2_iocb_clear_rw_locked(iocb);
Mark Fasheh7cdfc3a2007-04-16 17:28:51 -0700592
593 level = ocfs2_iocb_rw_locked_level(iocb);
Mark Fasheh7cdfc3a2007-04-16 17:28:51 -0700594 ocfs2_rw_unlock(inode, level);
Christoph Hellwig40e2e972010-07-18 21:17:09 +0000595
596 if (is_async)
597 aio_complete(iocb, ret, 0);
Christoph Hellwig72c50522011-06-24 14:29:48 -0400598 inode_dio_done(inode);
Mark Fashehccd979b2005-12-15 14:31:24 -0800599}
600
Joel Becker03f981c2007-01-04 14:54:41 -0800601/*
602 * ocfs2_invalidatepage() and ocfs2_releasepage() are shamelessly stolen
603 * from ext3. PageChecked() bits have been removed as OCFS2 does not
604 * do journalled data.
605 */
606static void ocfs2_invalidatepage(struct page *page, unsigned long offset)
607{
608 journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
609
Joel Becker2b4e30f2008-09-03 20:03:41 -0700610 jbd2_journal_invalidatepage(journal, page, offset);
Joel Becker03f981c2007-01-04 14:54:41 -0800611}
612
613static int ocfs2_releasepage(struct page *page, gfp_t wait)
614{
615 journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
616
617 if (!page_has_buffers(page))
618 return 0;
Joel Becker2b4e30f2008-09-03 20:03:41 -0700619 return jbd2_journal_try_to_free_buffers(journal, page, wait);
Joel Becker03f981c2007-01-04 14:54:41 -0800620}
621
Mark Fashehccd979b2005-12-15 14:31:24 -0800622static ssize_t ocfs2_direct_IO(int rw,
623 struct kiocb *iocb,
624 const struct iovec *iov,
625 loff_t offset,
626 unsigned long nr_segs)
627{
628 struct file *file = iocb->ki_filp;
Josef Sipekd28c9172006-12-08 02:37:25 -0800629 struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
Mark Fasheh53013cb2006-05-05 19:04:03 -0700630
Mark Fasheh6798d352007-09-07 14:05:51 -0700631 /*
632 * Fallback to buffered I/O if we see an inode without
633 * extents.
634 */
635 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
636 return 0;
637
Tao Mab80474b2009-09-10 15:28:47 +0800638 /* Fallback to buffered I/O if we are appending. */
639 if (i_size_read(inode) <= offset)
640 return 0;
641
Tao Mac1e8d352011-03-07 16:43:21 +0800642 return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev,
643 iov, offset, nr_segs,
644 ocfs2_direct_IO_get_blocks,
645 ocfs2_dio_end_io, NULL, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -0800646}
647
Mark Fasheh9517bac2007-02-09 20:24:12 -0800648static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb,
649 u32 cpos,
650 unsigned int *start,
651 unsigned int *end)
652{
653 unsigned int cluster_start = 0, cluster_end = PAGE_CACHE_SIZE;
654
655 if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) {
656 unsigned int cpp;
657
658 cpp = 1 << (PAGE_CACHE_SHIFT - osb->s_clustersize_bits);
659
660 cluster_start = cpos % cpp;
661 cluster_start = cluster_start << osb->s_clustersize_bits;
662
663 cluster_end = cluster_start + osb->s_clustersize;
664 }
665
666 BUG_ON(cluster_start > PAGE_SIZE);
667 BUG_ON(cluster_end > PAGE_SIZE);
668
669 if (start)
670 *start = cluster_start;
671 if (end)
672 *end = cluster_end;
673}
674
675/*
676 * 'from' and 'to' are the region in the page to avoid zeroing.
677 *
678 * If pagesize > clustersize, this function will avoid zeroing outside
679 * of the cluster boundary.
680 *
681 * from == to == 0 is code for "zero the entire cluster region"
682 */
683static void ocfs2_clear_page_regions(struct page *page,
684 struct ocfs2_super *osb, u32 cpos,
685 unsigned from, unsigned to)
686{
687 void *kaddr;
688 unsigned int cluster_start, cluster_end;
689
690 ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end);
691
Cong Wangc4bc8dc2011-11-25 23:14:34 +0800692 kaddr = kmap_atomic(page);
Mark Fasheh9517bac2007-02-09 20:24:12 -0800693
694 if (from || to) {
695 if (from > cluster_start)
696 memset(kaddr + cluster_start, 0, from - cluster_start);
697 if (to < cluster_end)
698 memset(kaddr + to, 0, cluster_end - to);
699 } else {
700 memset(kaddr + cluster_start, 0, cluster_end - cluster_start);
701 }
702
Cong Wangc4bc8dc2011-11-25 23:14:34 +0800703 kunmap_atomic(kaddr);
Mark Fasheh9517bac2007-02-09 20:24:12 -0800704}
705
706/*
Mark Fasheh4e9563f2007-11-01 11:37:48 -0700707 * Nonsparse file systems fully allocate before we get to the write
708 * code. This prevents ocfs2_write() from tagging the write as an
709 * allocating one, which means ocfs2_map_page_blocks() might try to
710 * read-in the blocks at the tail of our file. Avoid reading them by
711 * testing i_size against each block offset.
712 */
713static int ocfs2_should_read_blk(struct inode *inode, struct page *page,
714 unsigned int block_start)
715{
716 u64 offset = page_offset(page) + block_start;
717
718 if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
719 return 1;
720
721 if (i_size_read(inode) > offset)
722 return 1;
723
724 return 0;
725}
726
727/*
Christoph Hellwigebdec242010-10-06 10:47:23 +0200728 * Some of this taken from __block_write_begin(). We already have our
Mark Fasheh9517bac2007-02-09 20:24:12 -0800729 * mapping by now though, and the entire write will be allocating or
730 * it won't, so not much need to use BH_New.
731 *
732 * This will also skip zeroing, which is handled externally.
733 */
Mark Fasheh60b11392007-02-16 11:46:50 -0800734int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
735 struct inode *inode, unsigned int from,
736 unsigned int to, int new)
Mark Fasheh9517bac2007-02-09 20:24:12 -0800737{
738 int ret = 0;
739 struct buffer_head *head, *bh, *wait[2], **wait_bh = wait;
740 unsigned int block_end, block_start;
741 unsigned int bsize = 1 << inode->i_blkbits;
742
743 if (!page_has_buffers(page))
744 create_empty_buffers(page, bsize, 0);
745
746 head = page_buffers(page);
747 for (bh = head, block_start = 0; bh != head || !block_start;
748 bh = bh->b_this_page, block_start += bsize) {
749 block_end = block_start + bsize;
750
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700751 clear_buffer_new(bh);
752
Mark Fasheh9517bac2007-02-09 20:24:12 -0800753 /*
754 * Ignore blocks outside of our i/o range -
755 * they may belong to unallocated clusters.
756 */
Mark Fasheh60b11392007-02-16 11:46:50 -0800757 if (block_start >= to || block_end <= from) {
Mark Fasheh9517bac2007-02-09 20:24:12 -0800758 if (PageUptodate(page))
759 set_buffer_uptodate(bh);
760 continue;
761 }
762
763 /*
764 * For an allocating write with cluster size >= page
765 * size, we always write the entire page.
766 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700767 if (new)
768 set_buffer_new(bh);
Mark Fasheh9517bac2007-02-09 20:24:12 -0800769
770 if (!buffer_mapped(bh)) {
771 map_bh(bh, inode->i_sb, *p_blkno);
772 unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
773 }
774
775 if (PageUptodate(page)) {
776 if (!buffer_uptodate(bh))
777 set_buffer_uptodate(bh);
778 } else if (!buffer_uptodate(bh) && !buffer_delay(bh) &&
Mark Fashehbce99762007-06-18 11:12:36 -0700779 !buffer_new(bh) &&
Mark Fasheh4e9563f2007-11-01 11:37:48 -0700780 ocfs2_should_read_blk(inode, page, block_start) &&
Mark Fashehbce99762007-06-18 11:12:36 -0700781 (block_start < from || block_end > to)) {
Mark Fasheh9517bac2007-02-09 20:24:12 -0800782 ll_rw_block(READ, 1, &bh);
783 *wait_bh++=bh;
784 }
785
786 *p_blkno = *p_blkno + 1;
787 }
788
789 /*
790 * If we issued read requests - let them complete.
791 */
792 while(wait_bh > wait) {
793 wait_on_buffer(*--wait_bh);
794 if (!buffer_uptodate(*wait_bh))
795 ret = -EIO;
796 }
797
798 if (ret == 0 || !new)
799 return ret;
800
801 /*
802 * If we get -EIO above, zero out any newly allocated blocks
803 * to avoid exposing stale data.
804 */
805 bh = head;
806 block_start = 0;
807 do {
Mark Fasheh9517bac2007-02-09 20:24:12 -0800808 block_end = block_start + bsize;
809 if (block_end <= from)
810 goto next_bh;
811 if (block_start >= to)
812 break;
813
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800814 zero_user(page, block_start, bh->b_size);
Mark Fasheh9517bac2007-02-09 20:24:12 -0800815 set_buffer_uptodate(bh);
816 mark_buffer_dirty(bh);
817
818next_bh:
819 block_start = block_end;
820 bh = bh->b_this_page;
821 } while (bh != head);
822
823 return ret;
824}
825
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700826#if (PAGE_CACHE_SIZE >= OCFS2_MAX_CLUSTERSIZE)
827#define OCFS2_MAX_CTXT_PAGES 1
828#else
829#define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_CACHE_SIZE)
830#endif
Mark Fasheh6af67d82007-03-06 17:24:46 -0800831
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700832#define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_CACHE_SIZE / OCFS2_MIN_CLUSTERSIZE)
Mark Fasheh6af67d82007-03-06 17:24:46 -0800833
834/*
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700835 * Describe the state of a single cluster to be written to.
Mark Fasheh9517bac2007-02-09 20:24:12 -0800836 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700837struct ocfs2_write_cluster_desc {
838 u32 c_cpos;
839 u32 c_phys;
Mark Fasheh9517bac2007-02-09 20:24:12 -0800840 /*
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700841 * Give this a unique field because c_phys eventually gets
842 * filled.
Mark Fasheh9517bac2007-02-09 20:24:12 -0800843 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700844 unsigned c_new;
Mark Fashehb27b7cb2007-06-18 11:22:56 -0700845 unsigned c_unwritten;
Sunil Mushrane7432672009-08-06 16:12:58 -0700846 unsigned c_needs_zero;
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700847};
Mark Fasheh9517bac2007-02-09 20:24:12 -0800848
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700849struct ocfs2_write_ctxt {
850 /* Logical cluster position / len of write */
851 u32 w_cpos;
852 u32 w_clen;
Mark Fasheh9517bac2007-02-09 20:24:12 -0800853
Sunil Mushrane7432672009-08-06 16:12:58 -0700854 /* First cluster allocated in a nonsparse extend */
855 u32 w_first_new_cpos;
856
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700857 struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE];
Mark Fasheh9517bac2007-02-09 20:24:12 -0800858
859 /*
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700860 * This is true if page_size > cluster_size.
Mark Fasheh9517bac2007-02-09 20:24:12 -0800861 *
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700862 * It triggers a set of special cases during write which might
863 * have to deal with allocating writes to partial pages.
Mark Fasheh9517bac2007-02-09 20:24:12 -0800864 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700865 unsigned int w_large_pages;
Mark Fasheh9517bac2007-02-09 20:24:12 -0800866
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700867 /*
868 * Pages involved in this write.
869 *
870 * w_target_page is the page being written to by the user.
871 *
872 * w_pages is an array of pages which always contains
873 * w_target_page, and in the case of an allocating write with
874 * page_size < cluster size, it will contain zero'd and mapped
875 * pages adjacent to w_target_page which need to be written
876 * out in so that future reads from that region will get
877 * zero's.
878 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700879 unsigned int w_num_pages;
Goldwyn Rodrigues83fd9c72010-06-10 17:21:36 -0500880 struct page *w_pages[OCFS2_MAX_CTXT_PAGES];
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700881 struct page *w_target_page;
Mark Fasheh9517bac2007-02-09 20:24:12 -0800882
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700883 /*
Wengang Wang5cffff92011-07-24 10:36:54 -0700884 * w_target_locked is used for page_mkwrite path indicating no unlocking
885 * against w_target_page in ocfs2_write_end_nolock.
886 */
887 unsigned int w_target_locked:1;
888
889 /*
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700890 * ocfs2_write_end() uses this to know what the real range to
891 * write in the target should be.
892 */
893 unsigned int w_target_from;
894 unsigned int w_target_to;
895
896 /*
897 * We could use journal_current_handle() but this is cleaner,
898 * IMHO -Mark
899 */
900 handle_t *w_handle;
901
902 struct buffer_head *w_di_bh;
Mark Fashehb27b7cb2007-06-18 11:22:56 -0700903
904 struct ocfs2_cached_dealloc_ctxt w_dealloc;
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700905};
906
Mark Fasheh1d410a62007-09-07 14:20:45 -0700907void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages)
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700908{
909 int i;
910
Mark Fasheh1d410a62007-09-07 14:20:45 -0700911 for(i = 0; i < num_pages; i++) {
912 if (pages[i]) {
913 unlock_page(pages[i]);
914 mark_page_accessed(pages[i]);
915 page_cache_release(pages[i]);
916 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700917 }
Mark Fasheh1d410a62007-09-07 14:20:45 -0700918}
919
920static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt *wc)
921{
Wengang Wang5cffff92011-07-24 10:36:54 -0700922 int i;
923
924 /*
925 * w_target_locked is only set to true in the page_mkwrite() case.
926 * The intent is to allow us to lock the target page from write_begin()
927 * to write_end(). The caller must hold a ref on w_target_page.
928 */
929 if (wc->w_target_locked) {
930 BUG_ON(!wc->w_target_page);
931 for (i = 0; i < wc->w_num_pages; i++) {
932 if (wc->w_target_page == wc->w_pages[i]) {
933 wc->w_pages[i] = NULL;
934 break;
935 }
936 }
937 mark_page_accessed(wc->w_target_page);
938 page_cache_release(wc->w_target_page);
939 }
Mark Fasheh1d410a62007-09-07 14:20:45 -0700940 ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages);
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700941
942 brelse(wc->w_di_bh);
943 kfree(wc);
944}
945
946static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp,
947 struct ocfs2_super *osb, loff_t pos,
Mark Fasheh607d44a2007-05-09 15:14:45 -0700948 unsigned len, struct buffer_head *di_bh)
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700949{
tao.ma@oracle.com30b85482007-09-06 08:02:25 +0800950 u32 cend;
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700951 struct ocfs2_write_ctxt *wc;
952
953 wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS);
954 if (!wc)
955 return -ENOMEM;
956
957 wc->w_cpos = pos >> osb->s_clustersize_bits;
Sunil Mushrane7432672009-08-06 16:12:58 -0700958 wc->w_first_new_cpos = UINT_MAX;
tao.ma@oracle.com30b85482007-09-06 08:02:25 +0800959 cend = (pos + len - 1) >> osb->s_clustersize_bits;
960 wc->w_clen = cend - wc->w_cpos + 1;
Mark Fasheh607d44a2007-05-09 15:14:45 -0700961 get_bh(di_bh);
962 wc->w_di_bh = di_bh;
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700963
964 if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits))
965 wc->w_large_pages = 1;
966 else
967 wc->w_large_pages = 0;
968
Mark Fashehb27b7cb2007-06-18 11:22:56 -0700969 ocfs2_init_dealloc_ctxt(&wc->w_dealloc);
970
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700971 *wcp = wc;
972
973 return 0;
Mark Fasheh9517bac2007-02-09 20:24:12 -0800974}
975
976/*
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700977 * If a page has any new buffers, zero them out here, and mark them uptodate
978 * and dirty so they'll be written out (in order to prevent uninitialised
979 * block data from leaking). And clear the new bit.
Mark Fasheh9517bac2007-02-09 20:24:12 -0800980 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700981static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to)
Mark Fasheh9517bac2007-02-09 20:24:12 -0800982{
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700983 unsigned int block_start, block_end;
984 struct buffer_head *head, *bh;
Mark Fasheh9517bac2007-02-09 20:24:12 -0800985
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700986 BUG_ON(!PageLocked(page));
987 if (!page_has_buffers(page))
988 return;
989
990 bh = head = page_buffers(page);
991 block_start = 0;
992 do {
993 block_end = block_start + bh->b_size;
994
995 if (buffer_new(bh)) {
996 if (block_end > from && block_start < to) {
997 if (!PageUptodate(page)) {
998 unsigned start, end;
Mark Fasheh3a307ff2007-05-08 17:47:32 -0700999
1000 start = max(from, block_start);
1001 end = min(to, block_end);
1002
Christoph Lametereebd2aa2008-02-04 22:28:29 -08001003 zero_user_segment(page, start, end);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001004 set_buffer_uptodate(bh);
1005 }
1006
1007 clear_buffer_new(bh);
1008 mark_buffer_dirty(bh);
1009 }
1010 }
1011
1012 block_start = block_end;
1013 bh = bh->b_this_page;
1014 } while (bh != head);
1015}
1016
1017/*
1018 * Only called when we have a failure during allocating write to write
1019 * zero's to the newly allocated region.
1020 */
1021static void ocfs2_write_failure(struct inode *inode,
1022 struct ocfs2_write_ctxt *wc,
1023 loff_t user_pos, unsigned user_len)
1024{
1025 int i;
Mark Fasheh5c26a7b2007-09-18 17:49:29 -07001026 unsigned from = user_pos & (PAGE_CACHE_SIZE - 1),
1027 to = user_pos + user_len;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001028 struct page *tmppage;
1029
Mark Fasheh5c26a7b2007-09-18 17:49:29 -07001030 ocfs2_zero_new_buffers(wc->w_target_page, from, to);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001031
1032 for(i = 0; i < wc->w_num_pages; i++) {
1033 tmppage = wc->w_pages[i];
1034
Sunil Mushran961cecb2008-07-16 17:22:22 -07001035 if (page_has_buffers(tmppage)) {
Mark Fasheh53ef99c2008-11-18 16:53:43 -08001036 if (ocfs2_should_order_data(inode))
Joel Becker2b4e30f2008-09-03 20:03:41 -07001037 ocfs2_jbd2_file_inode(wc->w_handle, inode);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001038
Sunil Mushran961cecb2008-07-16 17:22:22 -07001039 block_commit_write(tmppage, from, to);
1040 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001041 }
1042}
1043
1044static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno,
1045 struct ocfs2_write_ctxt *wc,
1046 struct page *page, u32 cpos,
1047 loff_t user_pos, unsigned user_len,
1048 int new)
1049{
1050 int ret;
1051 unsigned int map_from = 0, map_to = 0;
1052 unsigned int cluster_start, cluster_end;
1053 unsigned int user_data_from = 0, user_data_to = 0;
1054
1055 ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos,
Mark Fasheh9517bac2007-02-09 20:24:12 -08001056 &cluster_start, &cluster_end);
1057
Goldwyn Rodrigues272b62c2011-02-17 09:44:40 -06001058 /* treat the write as new if the a hole/lseek spanned across
1059 * the page boundary.
1060 */
1061 new = new | ((i_size_read(inode) <= page_offset(page)) &&
1062 (page_offset(page) <= user_pos));
1063
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001064 if (page == wc->w_target_page) {
1065 map_from = user_pos & (PAGE_CACHE_SIZE - 1);
1066 map_to = map_from + user_len;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001067
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001068 if (new)
1069 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
1070 cluster_start, cluster_end,
1071 new);
1072 else
1073 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
1074 map_from, map_to, new);
1075 if (ret) {
Mark Fasheh9517bac2007-02-09 20:24:12 -08001076 mlog_errno(ret);
1077 goto out;
1078 }
1079
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001080 user_data_from = map_from;
1081 user_data_to = map_to;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001082 if (new) {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001083 map_from = cluster_start;
1084 map_to = cluster_end;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001085 }
1086 } else {
1087 /*
1088 * If we haven't allocated the new page yet, we
1089 * shouldn't be writing it out without copying user
1090 * data. This is likely a math error from the caller.
1091 */
1092 BUG_ON(!new);
1093
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001094 map_from = cluster_start;
1095 map_to = cluster_end;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001096
1097 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001098 cluster_start, cluster_end, new);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001099 if (ret) {
1100 mlog_errno(ret);
1101 goto out;
1102 }
1103 }
1104
1105 /*
1106 * Parts of newly allocated pages need to be zero'd.
1107 *
1108 * Above, we have also rewritten 'to' and 'from' - as far as
1109 * the rest of the function is concerned, the entire cluster
1110 * range inside of a page needs to be written.
1111 *
1112 * We can skip this if the page is up to date - it's already
1113 * been zero'd from being read in as a hole.
1114 */
1115 if (new && !PageUptodate(page))
1116 ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb),
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001117 cpos, user_data_from, user_data_to);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001118
1119 flush_dcache_page(page);
1120
Mark Fasheh9517bac2007-02-09 20:24:12 -08001121out:
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001122 return ret;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001123}
1124
1125/*
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001126 * This function will only grab one clusters worth of pages.
Mark Fasheh9517bac2007-02-09 20:24:12 -08001127 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001128static int ocfs2_grab_pages_for_write(struct address_space *mapping,
1129 struct ocfs2_write_ctxt *wc,
Joel Becker693c2412010-07-02 17:20:27 -07001130 u32 cpos, loff_t user_pos,
1131 unsigned user_len, int new,
Mark Fasheh7307de82007-05-09 15:16:19 -07001132 struct page *mmap_page)
Mark Fasheh9517bac2007-02-09 20:24:12 -08001133{
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001134 int ret = 0, i;
Joel Becker693c2412010-07-02 17:20:27 -07001135 unsigned long start, target_index, end_index, index;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001136 struct inode *inode = mapping->host;
Joel Becker693c2412010-07-02 17:20:27 -07001137 loff_t last_byte;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001138
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001139 target_index = user_pos >> PAGE_CACHE_SHIFT;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001140
1141 /*
1142 * Figure out how many pages we'll be manipulating here. For
Mark Fasheh60b11392007-02-16 11:46:50 -08001143 * non allocating write, we just change the one
Joel Becker693c2412010-07-02 17:20:27 -07001144 * page. Otherwise, we'll need a whole clusters worth. If we're
1145 * writing past i_size, we only need enough pages to cover the
1146 * last page of the write.
Mark Fasheh9517bac2007-02-09 20:24:12 -08001147 */
Mark Fasheh9517bac2007-02-09 20:24:12 -08001148 if (new) {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001149 wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb);
1150 start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos);
Joel Becker693c2412010-07-02 17:20:27 -07001151 /*
1152 * We need the index *past* the last page we could possibly
1153 * touch. This is the page past the end of the write or
1154 * i_size, whichever is greater.
1155 */
1156 last_byte = max(user_pos + user_len, i_size_read(inode));
1157 BUG_ON(last_byte < 1);
1158 end_index = ((last_byte - 1) >> PAGE_CACHE_SHIFT) + 1;
1159 if ((start + wc->w_num_pages) > end_index)
1160 wc->w_num_pages = end_index - start;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001161 } else {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001162 wc->w_num_pages = 1;
1163 start = target_index;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001164 }
1165
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001166 for(i = 0; i < wc->w_num_pages; i++) {
Mark Fasheh9517bac2007-02-09 20:24:12 -08001167 index = start + i;
1168
Mark Fasheh7307de82007-05-09 15:16:19 -07001169 if (index == target_index && mmap_page) {
1170 /*
1171 * ocfs2_pagemkwrite() is a little different
1172 * and wants us to directly use the page
1173 * passed in.
1174 */
1175 lock_page(mmap_page);
1176
Wengang Wang5cffff92011-07-24 10:36:54 -07001177 /* Exit and let the caller retry */
Mark Fasheh7307de82007-05-09 15:16:19 -07001178 if (mmap_page->mapping != mapping) {
Wengang Wang5cffff92011-07-24 10:36:54 -07001179 WARN_ON(mmap_page->mapping);
Mark Fasheh7307de82007-05-09 15:16:19 -07001180 unlock_page(mmap_page);
Wengang Wang5cffff92011-07-24 10:36:54 -07001181 ret = -EAGAIN;
Mark Fasheh7307de82007-05-09 15:16:19 -07001182 goto out;
1183 }
1184
1185 page_cache_get(mmap_page);
1186 wc->w_pages[i] = mmap_page;
Wengang Wang5cffff92011-07-24 10:36:54 -07001187 wc->w_target_locked = true;
Mark Fasheh7307de82007-05-09 15:16:19 -07001188 } else {
1189 wc->w_pages[i] = find_or_create_page(mapping, index,
1190 GFP_NOFS);
1191 if (!wc->w_pages[i]) {
1192 ret = -ENOMEM;
1193 mlog_errno(ret);
1194 goto out;
1195 }
Mark Fasheh9517bac2007-02-09 20:24:12 -08001196 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001197
1198 if (index == target_index)
1199 wc->w_target_page = wc->w_pages[i];
Mark Fasheh9517bac2007-02-09 20:24:12 -08001200 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001201out:
Wengang Wang5cffff92011-07-24 10:36:54 -07001202 if (ret)
1203 wc->w_target_locked = false;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001204 return ret;
1205}
1206
1207/*
1208 * Prepare a single cluster for write one cluster into the file.
1209 */
1210static int ocfs2_write_cluster(struct address_space *mapping,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001211 u32 phys, unsigned int unwritten,
Sunil Mushrane7432672009-08-06 16:12:58 -07001212 unsigned int should_zero,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001213 struct ocfs2_alloc_context *data_ac,
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001214 struct ocfs2_alloc_context *meta_ac,
1215 struct ocfs2_write_ctxt *wc, u32 cpos,
1216 loff_t user_pos, unsigned user_len)
1217{
Sunil Mushrane7432672009-08-06 16:12:58 -07001218 int ret, i, new;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001219 u64 v_blkno, p_blkno;
1220 struct inode *inode = mapping->host;
Joel Beckerf99b9b72008-08-20 19:36:33 -07001221 struct ocfs2_extent_tree et;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001222
1223 new = phys == 0 ? 1 : 0;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001224 if (new) {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001225 u32 tmp_pos;
1226
Mark Fasheh9517bac2007-02-09 20:24:12 -08001227 /*
1228 * This is safe to call with the page locks - it won't take
1229 * any additional semaphores or cluster locks.
1230 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001231 tmp_pos = cpos;
Tao Ma0eb8d472008-08-18 17:38:45 +08001232 ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode,
1233 &tmp_pos, 1, 0, wc->w_di_bh,
1234 wc->w_handle, data_ac,
1235 meta_ac, NULL);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001236 /*
1237 * This shouldn't happen because we must have already
1238 * calculated the correct meta data allocation required. The
1239 * internal tree allocation code should know how to increase
1240 * transaction credits itself.
1241 *
1242 * If need be, we could handle -EAGAIN for a
1243 * RESTART_TRANS here.
1244 */
1245 mlog_bug_on_msg(ret == -EAGAIN,
1246 "Inode %llu: EAGAIN return during allocation.\n",
1247 (unsigned long long)OCFS2_I(inode)->ip_blkno);
1248 if (ret < 0) {
1249 mlog_errno(ret);
1250 goto out;
1251 }
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001252 } else if (unwritten) {
Joel Becker5e404e92009-02-13 03:54:22 -08001253 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
1254 wc->w_di_bh);
Joel Beckerf99b9b72008-08-20 19:36:33 -07001255 ret = ocfs2_mark_extent_written(inode, &et,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001256 wc->w_handle, cpos, 1, phys,
Joel Beckerf99b9b72008-08-20 19:36:33 -07001257 meta_ac, &wc->w_dealloc);
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001258 if (ret < 0) {
1259 mlog_errno(ret);
1260 goto out;
1261 }
Mark Fasheh9517bac2007-02-09 20:24:12 -08001262 }
1263
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001264 if (should_zero)
1265 v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, cpos);
1266 else
1267 v_blkno = user_pos >> inode->i_sb->s_blocksize_bits;
1268
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001269 /*
1270 * The only reason this should fail is due to an inability to
1271 * find the extent added.
1272 */
Mark Fasheh49cb8d22007-03-09 16:21:46 -08001273 ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL,
1274 NULL);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001275 if (ret < 0) {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001276 ocfs2_error(inode->i_sb, "Corrupting extend for inode %llu, "
1277 "at logical block %llu",
1278 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1279 (unsigned long long)v_blkno);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001280 goto out;
1281 }
1282
1283 BUG_ON(p_blkno == 0);
1284
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001285 for(i = 0; i < wc->w_num_pages; i++) {
1286 int tmpret;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001287
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001288 tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc,
1289 wc->w_pages[i], cpos,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001290 user_pos, user_len,
1291 should_zero);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001292 if (tmpret) {
1293 mlog_errno(tmpret);
1294 if (ret == 0)
Wengang Wangcbfa9632009-07-13 11:38:23 +08001295 ret = tmpret;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001296 }
Mark Fasheh9517bac2007-02-09 20:24:12 -08001297 }
1298
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001299 /*
1300 * We only have cleanup to do in case of allocating write.
1301 */
1302 if (ret && new)
1303 ocfs2_write_failure(inode, wc, user_pos, user_len);
1304
Mark Fasheh9517bac2007-02-09 20:24:12 -08001305out:
Mark Fasheh9517bac2007-02-09 20:24:12 -08001306
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001307 return ret;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001308}
1309
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001310static int ocfs2_write_cluster_by_desc(struct address_space *mapping,
1311 struct ocfs2_alloc_context *data_ac,
1312 struct ocfs2_alloc_context *meta_ac,
1313 struct ocfs2_write_ctxt *wc,
1314 loff_t pos, unsigned len)
1315{
1316 int ret, i;
Mark Fashehdb562462007-09-17 09:06:29 -07001317 loff_t cluster_off;
1318 unsigned int local_len = len;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001319 struct ocfs2_write_cluster_desc *desc;
Mark Fashehdb562462007-09-17 09:06:29 -07001320 struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb);
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001321
1322 for (i = 0; i < wc->w_clen; i++) {
1323 desc = &wc->w_desc[i];
1324
Mark Fashehdb562462007-09-17 09:06:29 -07001325 /*
1326 * We have to make sure that the total write passed in
1327 * doesn't extend past a single cluster.
1328 */
1329 local_len = len;
1330 cluster_off = pos & (osb->s_clustersize - 1);
1331 if ((cluster_off + local_len) > osb->s_clustersize)
1332 local_len = osb->s_clustersize - cluster_off;
1333
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001334 ret = ocfs2_write_cluster(mapping, desc->c_phys,
Sunil Mushrane7432672009-08-06 16:12:58 -07001335 desc->c_unwritten,
1336 desc->c_needs_zero,
1337 data_ac, meta_ac,
Mark Fashehdb562462007-09-17 09:06:29 -07001338 wc, desc->c_cpos, pos, local_len);
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001339 if (ret) {
1340 mlog_errno(ret);
1341 goto out;
1342 }
Mark Fashehdb562462007-09-17 09:06:29 -07001343
1344 len -= local_len;
1345 pos += local_len;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001346 }
1347
1348 ret = 0;
1349out:
1350 return ret;
1351}
1352
Mark Fasheh9517bac2007-02-09 20:24:12 -08001353/*
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001354 * ocfs2_write_end() wants to know which parts of the target page it
1355 * should complete the write on. It's easiest to compute them ahead of
1356 * time when a more complete view of the write is available.
Mark Fasheh9517bac2007-02-09 20:24:12 -08001357 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001358static void ocfs2_set_target_boundaries(struct ocfs2_super *osb,
1359 struct ocfs2_write_ctxt *wc,
1360 loff_t pos, unsigned len, int alloc)
Mark Fasheh9517bac2007-02-09 20:24:12 -08001361{
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001362 struct ocfs2_write_cluster_desc *desc;
1363
1364 wc->w_target_from = pos & (PAGE_CACHE_SIZE - 1);
1365 wc->w_target_to = wc->w_target_from + len;
1366
1367 if (alloc == 0)
1368 return;
1369
1370 /*
1371 * Allocating write - we may have different boundaries based
1372 * on page size and cluster size.
1373 *
1374 * NOTE: We can no longer compute one value from the other as
1375 * the actual write length and user provided length may be
1376 * different.
1377 */
1378
1379 if (wc->w_large_pages) {
1380 /*
1381 * We only care about the 1st and last cluster within
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001382 * our range and whether they should be zero'd or not. Either
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001383 * value may be extended out to the start/end of a
1384 * newly allocated cluster.
1385 */
1386 desc = &wc->w_desc[0];
Sunil Mushrane7432672009-08-06 16:12:58 -07001387 if (desc->c_needs_zero)
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001388 ocfs2_figure_cluster_boundaries(osb,
1389 desc->c_cpos,
1390 &wc->w_target_from,
1391 NULL);
1392
1393 desc = &wc->w_desc[wc->w_clen - 1];
Sunil Mushrane7432672009-08-06 16:12:58 -07001394 if (desc->c_needs_zero)
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001395 ocfs2_figure_cluster_boundaries(osb,
1396 desc->c_cpos,
1397 NULL,
1398 &wc->w_target_to);
1399 } else {
1400 wc->w_target_from = 0;
1401 wc->w_target_to = PAGE_CACHE_SIZE;
1402 }
1403}
1404
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001405/*
1406 * Populate each single-cluster write descriptor in the write context
1407 * with information about the i/o to be done.
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001408 *
1409 * Returns the number of clusters that will have to be allocated, as
1410 * well as a worst case estimate of the number of extent records that
1411 * would have to be created during a write to an unwritten region.
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001412 */
1413static int ocfs2_populate_write_desc(struct inode *inode,
1414 struct ocfs2_write_ctxt *wc,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001415 unsigned int *clusters_to_alloc,
1416 unsigned int *extents_to_split)
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001417{
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001418 int ret;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001419 struct ocfs2_write_cluster_desc *desc;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001420 unsigned int num_clusters = 0;
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001421 unsigned int ext_flags = 0;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001422 u32 phys = 0;
1423 int i;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001424
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001425 *clusters_to_alloc = 0;
1426 *extents_to_split = 0;
1427
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001428 for (i = 0; i < wc->w_clen; i++) {
1429 desc = &wc->w_desc[i];
1430 desc->c_cpos = wc->w_cpos + i;
1431
1432 if (num_clusters == 0) {
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001433 /*
1434 * Need to look up the next extent record.
1435 */
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001436 ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys,
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001437 &num_clusters, &ext_flags);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001438 if (ret) {
1439 mlog_errno(ret);
Mark Fasheh607d44a2007-05-09 15:14:45 -07001440 goto out;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001441 }
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001442
Tao Ma293b2f72009-08-25 08:02:48 +08001443 /* We should already CoW the refcountd extent. */
1444 BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1445
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001446 /*
1447 * Assume worst case - that we're writing in
1448 * the middle of the extent.
1449 *
1450 * We can assume that the write proceeds from
1451 * left to right, in which case the extent
1452 * insert code is smart enough to coalesce the
1453 * next splits into the previous records created.
1454 */
1455 if (ext_flags & OCFS2_EXT_UNWRITTEN)
1456 *extents_to_split = *extents_to_split + 2;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001457 } else if (phys) {
1458 /*
1459 * Only increment phys if it doesn't describe
1460 * a hole.
1461 */
1462 phys++;
1463 }
1464
Sunil Mushrane7432672009-08-06 16:12:58 -07001465 /*
1466 * If w_first_new_cpos is < UINT_MAX, we have a non-sparse
1467 * file that got extended. w_first_new_cpos tells us
1468 * where the newly allocated clusters are so we can
1469 * zero them.
1470 */
1471 if (desc->c_cpos >= wc->w_first_new_cpos) {
1472 BUG_ON(phys == 0);
1473 desc->c_needs_zero = 1;
1474 }
1475
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001476 desc->c_phys = phys;
1477 if (phys == 0) {
1478 desc->c_new = 1;
Sunil Mushrane7432672009-08-06 16:12:58 -07001479 desc->c_needs_zero = 1;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001480 *clusters_to_alloc = *clusters_to_alloc + 1;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001481 }
Sunil Mushrane7432672009-08-06 16:12:58 -07001482
1483 if (ext_flags & OCFS2_EXT_UNWRITTEN) {
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001484 desc->c_unwritten = 1;
Sunil Mushrane7432672009-08-06 16:12:58 -07001485 desc->c_needs_zero = 1;
1486 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001487
1488 num_clusters--;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001489 }
1490
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001491 ret = 0;
1492out:
1493 return ret;
1494}
1495
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001496static int ocfs2_write_begin_inline(struct address_space *mapping,
1497 struct inode *inode,
1498 struct ocfs2_write_ctxt *wc)
1499{
1500 int ret;
1501 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1502 struct page *page;
1503 handle_t *handle;
1504 struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1505
1506 page = find_or_create_page(mapping, 0, GFP_NOFS);
1507 if (!page) {
1508 ret = -ENOMEM;
1509 mlog_errno(ret);
1510 goto out;
1511 }
1512 /*
1513 * If we don't set w_num_pages then this page won't get unlocked
1514 * and freed on cleanup of the write context.
1515 */
1516 wc->w_pages[0] = wc->w_target_page = page;
1517 wc->w_num_pages = 1;
1518
1519 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1520 if (IS_ERR(handle)) {
1521 ret = PTR_ERR(handle);
1522 mlog_errno(ret);
1523 goto out;
1524 }
1525
Joel Becker0cf2f762009-02-12 16:41:25 -08001526 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
Joel Becker13723d02008-10-17 19:25:01 -07001527 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001528 if (ret) {
1529 ocfs2_commit_trans(osb, handle);
1530
1531 mlog_errno(ret);
1532 goto out;
1533 }
1534
1535 if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
1536 ocfs2_set_inode_data_inline(inode, di);
1537
1538 if (!PageUptodate(page)) {
1539 ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh);
1540 if (ret) {
1541 ocfs2_commit_trans(osb, handle);
1542
1543 goto out;
1544 }
1545 }
1546
1547 wc->w_handle = handle;
1548out:
1549 return ret;
1550}
1551
1552int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size)
1553{
1554 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1555
Mark Fasheh0d8a4e02007-11-20 11:48:41 -08001556 if (new_size <= le16_to_cpu(di->id2.i_data.id_count))
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001557 return 1;
1558 return 0;
1559}
1560
1561static int ocfs2_try_to_write_inline_data(struct address_space *mapping,
1562 struct inode *inode, loff_t pos,
1563 unsigned len, struct page *mmap_page,
1564 struct ocfs2_write_ctxt *wc)
1565{
1566 int ret, written = 0;
1567 loff_t end = pos + len;
1568 struct ocfs2_inode_info *oi = OCFS2_I(inode);
Tiger Yangd9ae49d2009-03-05 11:06:15 +08001569 struct ocfs2_dinode *di = NULL;
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001570
Tao Ma95581562011-02-22 21:33:59 +08001571 trace_ocfs2_try_to_write_inline_data((unsigned long long)oi->ip_blkno,
1572 len, (unsigned long long)pos,
1573 oi->ip_dyn_features);
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001574
1575 /*
1576 * Handle inodes which already have inline data 1st.
1577 */
1578 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1579 if (mmap_page == NULL &&
1580 ocfs2_size_fits_inline_data(wc->w_di_bh, end))
1581 goto do_inline_write;
1582
1583 /*
1584 * The write won't fit - we have to give this inode an
1585 * inline extent list now.
1586 */
1587 ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh);
1588 if (ret)
1589 mlog_errno(ret);
1590 goto out;
1591 }
1592
1593 /*
1594 * Check whether the inode can accept inline data.
1595 */
1596 if (oi->ip_clusters != 0 || i_size_read(inode) != 0)
1597 return 0;
1598
1599 /*
1600 * Check whether the write can fit.
1601 */
Tiger Yangd9ae49d2009-03-05 11:06:15 +08001602 di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1603 if (mmap_page ||
1604 end > ocfs2_max_inline_data_with_xattr(inode->i_sb, di))
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001605 return 0;
1606
1607do_inline_write:
1608 ret = ocfs2_write_begin_inline(mapping, inode, wc);
1609 if (ret) {
1610 mlog_errno(ret);
1611 goto out;
1612 }
1613
1614 /*
1615 * This signals to the caller that the data can be written
1616 * inline.
1617 */
1618 written = 1;
1619out:
1620 return written ? written : ret;
1621}
1622
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001623/*
1624 * This function only does anything for file systems which can't
1625 * handle sparse files.
1626 *
1627 * What we want to do here is fill in any hole between the current end
1628 * of allocation and the end of our write. That way the rest of the
1629 * write path can treat it as an non-allocating write, which has no
1630 * special case code for sparse/nonsparse files.
1631 */
Joel Becker56934862010-07-01 15:13:31 -07001632static int ocfs2_expand_nonsparse_inode(struct inode *inode,
1633 struct buffer_head *di_bh,
1634 loff_t pos, unsigned len,
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001635 struct ocfs2_write_ctxt *wc)
1636{
1637 int ret;
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001638 loff_t newsize = pos + len;
1639
Joel Becker56934862010-07-01 15:13:31 -07001640 BUG_ON(ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)));
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001641
1642 if (newsize <= i_size_read(inode))
1643 return 0;
1644
Joel Becker56934862010-07-01 15:13:31 -07001645 ret = ocfs2_extend_no_holes(inode, di_bh, newsize, pos);
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001646 if (ret)
1647 mlog_errno(ret);
1648
Sunil Mushrane7432672009-08-06 16:12:58 -07001649 wc->w_first_new_cpos =
1650 ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode));
1651
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001652 return ret;
1653}
1654
Joel Becker56934862010-07-01 15:13:31 -07001655static int ocfs2_zero_tail(struct inode *inode, struct buffer_head *di_bh,
1656 loff_t pos)
1657{
1658 int ret = 0;
1659
1660 BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)));
1661 if (pos > i_size_read(inode))
1662 ret = ocfs2_zero_extend(inode, di_bh, pos);
1663
1664 return ret;
1665}
1666
Tao Ma50308d82010-11-04 15:14:11 +08001667/*
1668 * Try to flush truncate logs if we can free enough clusters from it.
1669 * As for return value, "< 0" means error, "0" no space and "1" means
1670 * we have freed enough spaces and let the caller try to allocate again.
1671 */
1672static int ocfs2_try_to_free_truncate_log(struct ocfs2_super *osb,
1673 unsigned int needed)
1674{
1675 tid_t target;
1676 int ret = 0;
1677 unsigned int truncated_clusters;
1678
1679 mutex_lock(&osb->osb_tl_inode->i_mutex);
1680 truncated_clusters = osb->truncated_clusters;
1681 mutex_unlock(&osb->osb_tl_inode->i_mutex);
1682
1683 /*
1684 * Check whether we can succeed in allocating if we free
1685 * the truncate log.
1686 */
1687 if (truncated_clusters < needed)
1688 goto out;
1689
1690 ret = ocfs2_flush_truncate_log(osb);
1691 if (ret) {
1692 mlog_errno(ret);
1693 goto out;
1694 }
1695
1696 if (jbd2_journal_start_commit(osb->journal->j_journal, &target)) {
1697 jbd2_log_wait_commit(osb->journal->j_journal, target);
1698 ret = 1;
1699 }
1700out:
1701 return ret;
1702}
1703
Tao Ma0378da0f2010-08-12 10:25:28 +08001704int ocfs2_write_begin_nolock(struct file *filp,
1705 struct address_space *mapping,
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001706 loff_t pos, unsigned len, unsigned flags,
1707 struct page **pagep, void **fsdata,
1708 struct buffer_head *di_bh, struct page *mmap_page)
1709{
Sunil Mushrane7432672009-08-06 16:12:58 -07001710 int ret, cluster_of_pages, credits = OCFS2_INODE_UPDATE_CREDITS;
Tao Ma50308d82010-11-04 15:14:11 +08001711 unsigned int clusters_to_alloc, extents_to_split, clusters_need = 0;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001712 struct ocfs2_write_ctxt *wc;
1713 struct inode *inode = mapping->host;
1714 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1715 struct ocfs2_dinode *di;
1716 struct ocfs2_alloc_context *data_ac = NULL;
1717 struct ocfs2_alloc_context *meta_ac = NULL;
1718 handle_t *handle;
Joel Beckerf99b9b72008-08-20 19:36:33 -07001719 struct ocfs2_extent_tree et;
Tao Ma50308d82010-11-04 15:14:11 +08001720 int try_free = 1, ret1;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001721
Tao Ma50308d82010-11-04 15:14:11 +08001722try_again:
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001723 ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh);
1724 if (ret) {
1725 mlog_errno(ret);
1726 return ret;
1727 }
1728
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001729 if (ocfs2_supports_inline_data(osb)) {
1730 ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len,
1731 mmap_page, wc);
1732 if (ret == 1) {
1733 ret = 0;
1734 goto success;
1735 }
1736 if (ret < 0) {
1737 mlog_errno(ret);
1738 goto out;
1739 }
1740 }
1741
Joel Becker56934862010-07-01 15:13:31 -07001742 if (ocfs2_sparse_alloc(osb))
1743 ret = ocfs2_zero_tail(inode, di_bh, pos);
1744 else
1745 ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos, len,
1746 wc);
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001747 if (ret) {
1748 mlog_errno(ret);
1749 goto out;
1750 }
1751
Tao Ma293b2f72009-08-25 08:02:48 +08001752 ret = ocfs2_check_range_for_refcount(inode, pos, len);
1753 if (ret < 0) {
1754 mlog_errno(ret);
1755 goto out;
1756 } else if (ret == 1) {
Tao Ma50308d82010-11-04 15:14:11 +08001757 clusters_need = wc->w_clen;
Tao Ma15502712010-08-12 10:36:38 +08001758 ret = ocfs2_refcount_cow(inode, filp, di_bh,
Tao Ma37f8a2b2009-08-26 09:47:28 +08001759 wc->w_cpos, wc->w_clen, UINT_MAX);
Tao Ma293b2f72009-08-25 08:02:48 +08001760 if (ret) {
1761 mlog_errno(ret);
1762 goto out;
1763 }
1764 }
1765
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001766 ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc,
1767 &extents_to_split);
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001768 if (ret) {
1769 mlog_errno(ret);
1770 goto out;
1771 }
Tao Ma50308d82010-11-04 15:14:11 +08001772 clusters_need += clusters_to_alloc;
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001773
1774 di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1775
Tao Ma95581562011-02-22 21:33:59 +08001776 trace_ocfs2_write_begin_nolock(
1777 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1778 (long long)i_size_read(inode),
1779 le32_to_cpu(di->i_clusters),
1780 pos, len, flags, mmap_page,
1781 clusters_to_alloc, extents_to_split);
1782
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001783 /*
1784 * We set w_target_from, w_target_to here so that
1785 * ocfs2_write_end() knows which range in the target page to
1786 * write out. An allocation requires that we write the entire
1787 * cluster range.
1788 */
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001789 if (clusters_to_alloc || extents_to_split) {
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001790 /*
1791 * XXX: We are stretching the limits of
Mark Fashehb27b7cb2007-06-18 11:22:56 -07001792 * ocfs2_lock_allocators(). It greatly over-estimates
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001793 * the work to be done.
1794 */
Joel Becker5e404e92009-02-13 03:54:22 -08001795 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
1796 wc->w_di_bh);
Joel Beckerf99b9b72008-08-20 19:36:33 -07001797 ret = ocfs2_lock_allocators(inode, &et,
Tao Ma231b87d2008-08-18 17:38:42 +08001798 clusters_to_alloc, extents_to_split,
Joel Beckerf99b9b72008-08-20 19:36:33 -07001799 &data_ac, &meta_ac);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001800 if (ret) {
1801 mlog_errno(ret);
Mark Fasheh607d44a2007-05-09 15:14:45 -07001802 goto out;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001803 }
1804
Mark Fasheh4fe370a2009-12-07 13:15:40 -08001805 if (data_ac)
1806 data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv;
1807
Tao Ma811f9332008-08-18 17:38:43 +08001808 credits = ocfs2_calc_extend_credits(inode->i_sb,
1809 &di->id2.i_list,
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001810 clusters_to_alloc);
1811
Mark Fasheh9517bac2007-02-09 20:24:12 -08001812 }
1813
Sunil Mushrane7432672009-08-06 16:12:58 -07001814 /*
1815 * We have to zero sparse allocated clusters, unwritten extent clusters,
1816 * and non-sparse clusters we just extended. For non-sparse writes,
1817 * we know zeros will only be needed in the first and/or last cluster.
1818 */
1819 if (clusters_to_alloc || extents_to_split ||
Sunil Mushran8379e7c2009-09-04 11:12:01 -07001820 (wc->w_clen && (wc->w_desc[0].c_needs_zero ||
1821 wc->w_desc[wc->w_clen - 1].c_needs_zero)))
Sunil Mushrane7432672009-08-06 16:12:58 -07001822 cluster_of_pages = 1;
1823 else
1824 cluster_of_pages = 0;
1825
1826 ocfs2_set_target_boundaries(osb, wc, pos, len, cluster_of_pages);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001827
Mark Fasheh9517bac2007-02-09 20:24:12 -08001828 handle = ocfs2_start_trans(osb, credits);
1829 if (IS_ERR(handle)) {
1830 ret = PTR_ERR(handle);
1831 mlog_errno(ret);
Mark Fasheh607d44a2007-05-09 15:14:45 -07001832 goto out;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001833 }
1834
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001835 wc->w_handle = handle;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001836
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001837 if (clusters_to_alloc) {
1838 ret = dquot_alloc_space_nodirty(inode,
1839 ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc));
1840 if (ret)
1841 goto out_commit;
Jan Karaa90714c2008-10-09 19:38:40 +02001842 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001843 /*
1844 * We don't want this to fail in ocfs2_write_end(), so do it
1845 * here.
1846 */
Joel Becker0cf2f762009-02-12 16:41:25 -08001847 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
Joel Becker13723d02008-10-17 19:25:01 -07001848 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001849 if (ret) {
1850 mlog_errno(ret);
Jan Karaa90714c2008-10-09 19:38:40 +02001851 goto out_quota;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001852 }
1853
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001854 /*
1855 * Fill our page array first. That way we've grabbed enough so
1856 * that we can zero and flush if we error after adding the
1857 * extent.
1858 */
Joel Becker693c2412010-07-02 17:20:27 -07001859 ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, len,
Sunil Mushrane7432672009-08-06 16:12:58 -07001860 cluster_of_pages, mmap_page);
Wengang Wang5cffff92011-07-24 10:36:54 -07001861 if (ret && ret != -EAGAIN) {
Mark Fasheh9517bac2007-02-09 20:24:12 -08001862 mlog_errno(ret);
Jan Karaa90714c2008-10-09 19:38:40 +02001863 goto out_quota;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001864 }
Mark Fasheh9517bac2007-02-09 20:24:12 -08001865
Wengang Wang5cffff92011-07-24 10:36:54 -07001866 /*
1867 * ocfs2_grab_pages_for_write() returns -EAGAIN if it could not lock
1868 * the target page. In this case, we exit with no error and no target
1869 * page. This will trigger the caller, page_mkwrite(), to re-try
1870 * the operation.
1871 */
1872 if (ret == -EAGAIN) {
1873 BUG_ON(wc->w_target_page);
1874 ret = 0;
1875 goto out_quota;
1876 }
1877
Mark Fasheh0d172ba2007-05-14 18:09:54 -07001878 ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos,
1879 len);
1880 if (ret) {
1881 mlog_errno(ret);
Jan Karaa90714c2008-10-09 19:38:40 +02001882 goto out_quota;
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001883 }
1884
1885 if (data_ac)
1886 ocfs2_free_alloc_context(data_ac);
1887 if (meta_ac)
1888 ocfs2_free_alloc_context(meta_ac);
1889
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001890success:
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001891 *pagep = wc->w_target_page;
1892 *fsdata = wc;
1893 return 0;
Jan Karaa90714c2008-10-09 19:38:40 +02001894out_quota:
1895 if (clusters_to_alloc)
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001896 dquot_free_space(inode,
Jan Karaa90714c2008-10-09 19:38:40 +02001897 ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc));
Mark Fasheh9517bac2007-02-09 20:24:12 -08001898out_commit:
1899 ocfs2_commit_trans(osb, handle);
1900
Mark Fasheh9517bac2007-02-09 20:24:12 -08001901out:
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001902 ocfs2_free_write_ctxt(wc);
1903
Mark Fasheh9517bac2007-02-09 20:24:12 -08001904 if (data_ac)
1905 ocfs2_free_alloc_context(data_ac);
1906 if (meta_ac)
1907 ocfs2_free_alloc_context(meta_ac);
Tao Ma50308d82010-11-04 15:14:11 +08001908
1909 if (ret == -ENOSPC && try_free) {
1910 /*
1911 * Try to free some truncate log so that we can have enough
1912 * clusters to allocate.
1913 */
1914 try_free = 0;
1915
1916 ret1 = ocfs2_try_to_free_truncate_log(osb, clusters_need);
1917 if (ret1 == 1)
1918 goto try_again;
1919
1920 if (ret1 < 0)
1921 mlog_errno(ret1);
1922 }
1923
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001924 return ret;
1925}
Mark Fasheh9517bac2007-02-09 20:24:12 -08001926
Nick Pigginb6af1bc2007-10-16 01:25:24 -07001927static int ocfs2_write_begin(struct file *file, struct address_space *mapping,
1928 loff_t pos, unsigned len, unsigned flags,
1929 struct page **pagep, void **fsdata)
Mark Fasheh607d44a2007-05-09 15:14:45 -07001930{
1931 int ret;
1932 struct buffer_head *di_bh = NULL;
1933 struct inode *inode = mapping->host;
1934
Mark Fashehe63aecb62007-10-18 15:30:42 -07001935 ret = ocfs2_inode_lock(inode, &di_bh, 1);
Mark Fasheh607d44a2007-05-09 15:14:45 -07001936 if (ret) {
1937 mlog_errno(ret);
1938 return ret;
1939 }
1940
1941 /*
1942 * Take alloc sem here to prevent concurrent lookups. That way
1943 * the mapping, zeroing and tree manipulation within
1944 * ocfs2_write() will be safe against ->readpage(). This
1945 * should also serve to lock out allocation from a shared
1946 * writeable region.
1947 */
1948 down_write(&OCFS2_I(inode)->ip_alloc_sem);
1949
Tao Ma0378da0f2010-08-12 10:25:28 +08001950 ret = ocfs2_write_begin_nolock(file, mapping, pos, len, flags, pagep,
Mark Fasheh7307de82007-05-09 15:16:19 -07001951 fsdata, di_bh, NULL);
Mark Fasheh607d44a2007-05-09 15:14:45 -07001952 if (ret) {
1953 mlog_errno(ret);
Mark Fashehc934a922007-10-18 15:23:46 -07001954 goto out_fail;
Mark Fasheh607d44a2007-05-09 15:14:45 -07001955 }
1956
1957 brelse(di_bh);
1958
1959 return 0;
1960
Mark Fasheh607d44a2007-05-09 15:14:45 -07001961out_fail:
1962 up_write(&OCFS2_I(inode)->ip_alloc_sem);
1963
1964 brelse(di_bh);
Mark Fashehe63aecb62007-10-18 15:30:42 -07001965 ocfs2_inode_unlock(inode, 1);
Mark Fasheh607d44a2007-05-09 15:14:45 -07001966
1967 return ret;
1968}
1969
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001970static void ocfs2_write_end_inline(struct inode *inode, loff_t pos,
1971 unsigned len, unsigned *copied,
1972 struct ocfs2_dinode *di,
1973 struct ocfs2_write_ctxt *wc)
1974{
1975 void *kaddr;
1976
1977 if (unlikely(*copied < len)) {
1978 if (!PageUptodate(wc->w_target_page)) {
1979 *copied = 0;
1980 return;
1981 }
1982 }
1983
Cong Wangc4bc8dc2011-11-25 23:14:34 +08001984 kaddr = kmap_atomic(wc->w_target_page);
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001985 memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied);
Cong Wangc4bc8dc2011-11-25 23:14:34 +08001986 kunmap_atomic(kaddr);
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001987
Tao Ma95581562011-02-22 21:33:59 +08001988 trace_ocfs2_write_end_inline(
1989 (unsigned long long)OCFS2_I(inode)->ip_blkno,
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001990 (unsigned long long)pos, *copied,
1991 le16_to_cpu(di->id2.i_data.id_count),
1992 le16_to_cpu(di->i_dyn_features));
1993}
1994
Mark Fasheh7307de82007-05-09 15:16:19 -07001995int ocfs2_write_end_nolock(struct address_space *mapping,
1996 loff_t pos, unsigned len, unsigned copied,
1997 struct page *page, void *fsdata)
Mark Fasheh3a307ff2007-05-08 17:47:32 -07001998{
1999 int i;
2000 unsigned from, to, start = pos & (PAGE_CACHE_SIZE - 1);
2001 struct inode *inode = mapping->host;
2002 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2003 struct ocfs2_write_ctxt *wc = fsdata;
2004 struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
2005 handle_t *handle = wc->w_handle;
2006 struct page *tmppage;
2007
Mark Fasheh1afc32b2007-09-07 14:46:51 -07002008 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2009 ocfs2_write_end_inline(inode, pos, len, &copied, di, wc);
2010 goto out_write_size;
2011 }
2012
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002013 if (unlikely(copied < len)) {
2014 if (!PageUptodate(wc->w_target_page))
2015 copied = 0;
2016
2017 ocfs2_zero_new_buffers(wc->w_target_page, start+copied,
2018 start+len);
2019 }
2020 flush_dcache_page(wc->w_target_page);
2021
2022 for(i = 0; i < wc->w_num_pages; i++) {
2023 tmppage = wc->w_pages[i];
2024
2025 if (tmppage == wc->w_target_page) {
2026 from = wc->w_target_from;
2027 to = wc->w_target_to;
2028
2029 BUG_ON(from > PAGE_CACHE_SIZE ||
2030 to > PAGE_CACHE_SIZE ||
2031 to < from);
2032 } else {
2033 /*
2034 * Pages adjacent to the target (if any) imply
2035 * a hole-filling write in which case we want
2036 * to flush their entire range.
2037 */
2038 from = 0;
2039 to = PAGE_CACHE_SIZE;
2040 }
2041
Sunil Mushran961cecb2008-07-16 17:22:22 -07002042 if (page_has_buffers(tmppage)) {
Mark Fasheh53ef99c2008-11-18 16:53:43 -08002043 if (ocfs2_should_order_data(inode))
Joel Becker2b4e30f2008-09-03 20:03:41 -07002044 ocfs2_jbd2_file_inode(wc->w_handle, inode);
Sunil Mushran961cecb2008-07-16 17:22:22 -07002045 block_commit_write(tmppage, from, to);
2046 }
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002047 }
2048
Mark Fasheh1afc32b2007-09-07 14:46:51 -07002049out_write_size:
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002050 pos += copied;
2051 if (pos > inode->i_size) {
2052 i_size_write(inode, pos);
2053 mark_inode_dirty(inode);
2054 }
2055 inode->i_blocks = ocfs2_inode_sector_count(inode);
2056 di->i_size = cpu_to_le64((u64)i_size_read(inode));
2057 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2058 di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
2059 di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002060 ocfs2_journal_dirty(handle, wc->w_di_bh);
2061
2062 ocfs2_commit_trans(osb, handle);
Mark Fasheh59a5e412007-06-22 15:52:36 -07002063
Mark Fashehb27b7cb2007-06-18 11:22:56 -07002064 ocfs2_run_deallocs(osb, &wc->w_dealloc);
2065
Mark Fasheh3a307ff2007-05-08 17:47:32 -07002066 ocfs2_free_write_ctxt(wc);
2067
2068 return copied;
Mark Fasheh9517bac2007-02-09 20:24:12 -08002069}
2070
Nick Pigginb6af1bc2007-10-16 01:25:24 -07002071static int ocfs2_write_end(struct file *file, struct address_space *mapping,
2072 loff_t pos, unsigned len, unsigned copied,
2073 struct page *page, void *fsdata)
Mark Fasheh607d44a2007-05-09 15:14:45 -07002074{
2075 int ret;
2076 struct inode *inode = mapping->host;
2077
2078 ret = ocfs2_write_end_nolock(mapping, pos, len, copied, page, fsdata);
2079
Mark Fasheh607d44a2007-05-09 15:14:45 -07002080 up_write(&OCFS2_I(inode)->ip_alloc_sem);
Mark Fashehe63aecb62007-10-18 15:30:42 -07002081 ocfs2_inode_unlock(inode, 1);
Mark Fasheh607d44a2007-05-09 15:14:45 -07002082
2083 return ret;
2084}
2085
Christoph Hellwigf5e54d62006-06-28 04:26:44 -07002086const struct address_space_operations ocfs2_aops = {
Hisashi Hifumi1fca3a02009-03-05 17:22:21 +09002087 .readpage = ocfs2_readpage,
2088 .readpages = ocfs2_readpages,
2089 .writepage = ocfs2_writepage,
2090 .write_begin = ocfs2_write_begin,
2091 .write_end = ocfs2_write_end,
2092 .bmap = ocfs2_bmap,
Hisashi Hifumi1fca3a02009-03-05 17:22:21 +09002093 .direct_IO = ocfs2_direct_IO,
2094 .invalidatepage = ocfs2_invalidatepage,
2095 .releasepage = ocfs2_releasepage,
2096 .migratepage = buffer_migrate_page,
2097 .is_partially_uptodate = block_is_partially_uptodate,
Andi Kleenaa261f52009-09-16 11:50:16 +02002098 .error_remove_page = generic_error_remove_page,
Mark Fashehccd979b2005-12-15 14:31:24 -08002099};