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ccd979bd MF |
1 | /* -*- 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> | |
9517bac6 | 27 | #include <linux/swap.h> |
6af67d82 | 28 | #include <linux/pipe_fs_i.h> |
628a24f5 | 29 | #include <linux/mpage.h> |
a90714c1 | 30 | #include <linux/quotaops.h> |
24c40b32 | 31 | #include <linux/blkdev.h> |
e2e40f2c | 32 | #include <linux/uio.h> |
ccd979bd | 33 | |
ccd979bd MF |
34 | #include <cluster/masklog.h> |
35 | ||
36 | #include "ocfs2.h" | |
37 | ||
38 | #include "alloc.h" | |
39 | #include "aops.h" | |
40 | #include "dlmglue.h" | |
41 | #include "extent_map.h" | |
42 | #include "file.h" | |
43 | #include "inode.h" | |
44 | #include "journal.h" | |
9517bac6 | 45 | #include "suballoc.h" |
ccd979bd MF |
46 | #include "super.h" |
47 | #include "symlink.h" | |
293b2f70 | 48 | #include "refcounttree.h" |
9558156b | 49 | #include "ocfs2_trace.h" |
ccd979bd MF |
50 | |
51 | #include "buffer_head_io.h" | |
24c40b32 JQ |
52 | #include "dir.h" |
53 | #include "namei.h" | |
54 | #include "sysfile.h" | |
ccd979bd MF |
55 | |
56 | static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock, | |
57 | struct buffer_head *bh_result, int create) | |
58 | { | |
59 | int err = -EIO; | |
60 | int status; | |
61 | struct ocfs2_dinode *fe = NULL; | |
62 | struct buffer_head *bh = NULL; | |
63 | struct buffer_head *buffer_cache_bh = NULL; | |
64 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
65 | void *kaddr; | |
66 | ||
9558156b TM |
67 | trace_ocfs2_symlink_get_block( |
68 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
69 | (unsigned long long)iblock, bh_result, create); | |
ccd979bd MF |
70 | |
71 | BUG_ON(ocfs2_inode_is_fast_symlink(inode)); | |
72 | ||
73 | if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) { | |
74 | mlog(ML_ERROR, "block offset > PATH_MAX: %llu", | |
75 | (unsigned long long)iblock); | |
76 | goto bail; | |
77 | } | |
78 | ||
b657c95c | 79 | status = ocfs2_read_inode_block(inode, &bh); |
ccd979bd MF |
80 | if (status < 0) { |
81 | mlog_errno(status); | |
82 | goto bail; | |
83 | } | |
84 | fe = (struct ocfs2_dinode *) bh->b_data; | |
85 | ||
ccd979bd MF |
86 | if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb, |
87 | le32_to_cpu(fe->i_clusters))) { | |
7391a294 | 88 | err = -ENOMEM; |
ccd979bd MF |
89 | mlog(ML_ERROR, "block offset is outside the allocated size: " |
90 | "%llu\n", (unsigned long long)iblock); | |
91 | goto bail; | |
92 | } | |
93 | ||
94 | /* We don't use the page cache to create symlink data, so if | |
95 | * need be, copy it over from the buffer cache. */ | |
96 | if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) { | |
97 | u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + | |
98 | iblock; | |
99 | buffer_cache_bh = sb_getblk(osb->sb, blkno); | |
100 | if (!buffer_cache_bh) { | |
7391a294 | 101 | err = -ENOMEM; |
ccd979bd MF |
102 | mlog(ML_ERROR, "couldn't getblock for symlink!\n"); |
103 | goto bail; | |
104 | } | |
105 | ||
106 | /* we haven't locked out transactions, so a commit | |
107 | * could've happened. Since we've got a reference on | |
108 | * the bh, even if it commits while we're doing the | |
109 | * copy, the data is still good. */ | |
110 | if (buffer_jbd(buffer_cache_bh) | |
111 | && ocfs2_inode_is_new(inode)) { | |
c4bc8dcb | 112 | kaddr = kmap_atomic(bh_result->b_page); |
ccd979bd MF |
113 | if (!kaddr) { |
114 | mlog(ML_ERROR, "couldn't kmap!\n"); | |
115 | goto bail; | |
116 | } | |
117 | memcpy(kaddr + (bh_result->b_size * iblock), | |
118 | buffer_cache_bh->b_data, | |
119 | bh_result->b_size); | |
c4bc8dcb | 120 | kunmap_atomic(kaddr); |
ccd979bd MF |
121 | set_buffer_uptodate(bh_result); |
122 | } | |
123 | brelse(buffer_cache_bh); | |
124 | } | |
125 | ||
126 | map_bh(bh_result, inode->i_sb, | |
127 | le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock); | |
128 | ||
129 | err = 0; | |
130 | ||
131 | bail: | |
a81cb88b | 132 | brelse(bh); |
ccd979bd | 133 | |
ccd979bd MF |
134 | return err; |
135 | } | |
136 | ||
6f70fa51 TM |
137 | int ocfs2_get_block(struct inode *inode, sector_t iblock, |
138 | struct buffer_head *bh_result, int create) | |
ccd979bd MF |
139 | { |
140 | int err = 0; | |
49cb8d2d | 141 | unsigned int ext_flags; |
628a24f5 MF |
142 | u64 max_blocks = bh_result->b_size >> inode->i_blkbits; |
143 | u64 p_blkno, count, past_eof; | |
25baf2da | 144 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 145 | |
9558156b TM |
146 | trace_ocfs2_get_block((unsigned long long)OCFS2_I(inode)->ip_blkno, |
147 | (unsigned long long)iblock, bh_result, create); | |
ccd979bd MF |
148 | |
149 | if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) | |
150 | mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n", | |
151 | inode, inode->i_ino); | |
152 | ||
153 | if (S_ISLNK(inode->i_mode)) { | |
154 | /* this always does I/O for some reason. */ | |
155 | err = ocfs2_symlink_get_block(inode, iblock, bh_result, create); | |
156 | goto bail; | |
157 | } | |
158 | ||
628a24f5 | 159 | err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &count, |
49cb8d2d | 160 | &ext_flags); |
ccd979bd MF |
161 | if (err) { |
162 | mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, " | |
b0697053 MF |
163 | "%llu, NULL)\n", err, inode, (unsigned long long)iblock, |
164 | (unsigned long long)p_blkno); | |
ccd979bd MF |
165 | goto bail; |
166 | } | |
167 | ||
628a24f5 MF |
168 | if (max_blocks < count) |
169 | count = max_blocks; | |
170 | ||
25baf2da MF |
171 | /* |
172 | * ocfs2 never allocates in this function - the only time we | |
173 | * need to use BH_New is when we're extending i_size on a file | |
174 | * system which doesn't support holes, in which case BH_New | |
ebdec241 | 175 | * allows __block_write_begin() to zero. |
c0420ad2 CL |
176 | * |
177 | * If we see this on a sparse file system, then a truncate has | |
178 | * raced us and removed the cluster. In this case, we clear | |
179 | * the buffers dirty and uptodate bits and let the buffer code | |
180 | * ignore it as a hole. | |
25baf2da | 181 | */ |
c0420ad2 CL |
182 | if (create && p_blkno == 0 && ocfs2_sparse_alloc(osb)) { |
183 | clear_buffer_dirty(bh_result); | |
184 | clear_buffer_uptodate(bh_result); | |
185 | goto bail; | |
186 | } | |
25baf2da | 187 | |
49cb8d2d MF |
188 | /* Treat the unwritten extent as a hole for zeroing purposes. */ |
189 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) | |
25baf2da MF |
190 | map_bh(bh_result, inode->i_sb, p_blkno); |
191 | ||
628a24f5 MF |
192 | bh_result->b_size = count << inode->i_blkbits; |
193 | ||
25baf2da MF |
194 | if (!ocfs2_sparse_alloc(osb)) { |
195 | if (p_blkno == 0) { | |
196 | err = -EIO; | |
197 | mlog(ML_ERROR, | |
198 | "iblock = %llu p_blkno = %llu blkno=(%llu)\n", | |
199 | (unsigned long long)iblock, | |
200 | (unsigned long long)p_blkno, | |
201 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
202 | mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters); | |
203 | dump_stack(); | |
1f4cea37 | 204 | goto bail; |
25baf2da | 205 | } |
25baf2da | 206 | } |
ccd979bd | 207 | |
5693486b | 208 | past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); |
9558156b TM |
209 | |
210 | trace_ocfs2_get_block_end((unsigned long long)OCFS2_I(inode)->ip_blkno, | |
211 | (unsigned long long)past_eof); | |
5693486b JB |
212 | if (create && (iblock >= past_eof)) |
213 | set_buffer_new(bh_result); | |
214 | ||
ccd979bd MF |
215 | bail: |
216 | if (err < 0) | |
217 | err = -EIO; | |
218 | ||
ccd979bd MF |
219 | return err; |
220 | } | |
221 | ||
1afc32b9 MF |
222 | int ocfs2_read_inline_data(struct inode *inode, struct page *page, |
223 | struct buffer_head *di_bh) | |
6798d35a MF |
224 | { |
225 | void *kaddr; | |
d2849fb2 | 226 | loff_t size; |
6798d35a MF |
227 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
228 | ||
229 | if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) { | |
7ecef14a | 230 | ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag\n", |
6798d35a MF |
231 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
232 | return -EROFS; | |
233 | } | |
234 | ||
235 | size = i_size_read(inode); | |
236 | ||
237 | if (size > PAGE_CACHE_SIZE || | |
d9ae49d6 | 238 | size > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) { |
6798d35a | 239 | ocfs2_error(inode->i_sb, |
7ecef14a | 240 | "Inode %llu has with inline data has bad size: %Lu\n", |
d2849fb2 JK |
241 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
242 | (unsigned long long)size); | |
6798d35a MF |
243 | return -EROFS; |
244 | } | |
245 | ||
c4bc8dcb | 246 | kaddr = kmap_atomic(page); |
6798d35a MF |
247 | if (size) |
248 | memcpy(kaddr, di->id2.i_data.id_data, size); | |
249 | /* Clear the remaining part of the page */ | |
250 | memset(kaddr + size, 0, PAGE_CACHE_SIZE - size); | |
251 | flush_dcache_page(page); | |
c4bc8dcb | 252 | kunmap_atomic(kaddr); |
6798d35a MF |
253 | |
254 | SetPageUptodate(page); | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | static int ocfs2_readpage_inline(struct inode *inode, struct page *page) | |
260 | { | |
261 | int ret; | |
262 | struct buffer_head *di_bh = NULL; | |
6798d35a MF |
263 | |
264 | BUG_ON(!PageLocked(page)); | |
86c838b0 | 265 | BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)); |
6798d35a | 266 | |
b657c95c | 267 | ret = ocfs2_read_inode_block(inode, &di_bh); |
6798d35a MF |
268 | if (ret) { |
269 | mlog_errno(ret); | |
270 | goto out; | |
271 | } | |
272 | ||
273 | ret = ocfs2_read_inline_data(inode, page, di_bh); | |
274 | out: | |
275 | unlock_page(page); | |
276 | ||
277 | brelse(di_bh); | |
278 | return ret; | |
279 | } | |
280 | ||
ccd979bd MF |
281 | static int ocfs2_readpage(struct file *file, struct page *page) |
282 | { | |
283 | struct inode *inode = page->mapping->host; | |
6798d35a | 284 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
ccd979bd MF |
285 | loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT; |
286 | int ret, unlock = 1; | |
287 | ||
9558156b TM |
288 | trace_ocfs2_readpage((unsigned long long)oi->ip_blkno, |
289 | (page ? page->index : 0)); | |
ccd979bd | 290 | |
e63aecb6 | 291 | ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page); |
ccd979bd MF |
292 | if (ret != 0) { |
293 | if (ret == AOP_TRUNCATED_PAGE) | |
294 | unlock = 0; | |
295 | mlog_errno(ret); | |
296 | goto out; | |
297 | } | |
298 | ||
6798d35a | 299 | if (down_read_trylock(&oi->ip_alloc_sem) == 0) { |
c7e25e6e JK |
300 | /* |
301 | * Unlock the page and cycle ip_alloc_sem so that we don't | |
302 | * busyloop waiting for ip_alloc_sem to unlock | |
303 | */ | |
e9dfc0b2 | 304 | ret = AOP_TRUNCATED_PAGE; |
c7e25e6e JK |
305 | unlock_page(page); |
306 | unlock = 0; | |
307 | down_read(&oi->ip_alloc_sem); | |
308 | up_read(&oi->ip_alloc_sem); | |
e63aecb6 | 309 | goto out_inode_unlock; |
e9dfc0b2 | 310 | } |
ccd979bd MF |
311 | |
312 | /* | |
313 | * i_size might have just been updated as we grabed the meta lock. We | |
314 | * might now be discovering a truncate that hit on another node. | |
315 | * block_read_full_page->get_block freaks out if it is asked to read | |
316 | * beyond the end of a file, so we check here. Callers | |
54cb8821 | 317 | * (generic_file_read, vm_ops->fault) are clever enough to check i_size |
ccd979bd MF |
318 | * and notice that the page they just read isn't needed. |
319 | * | |
320 | * XXX sys_readahead() seems to get that wrong? | |
321 | */ | |
322 | if (start >= i_size_read(inode)) { | |
eebd2aa3 | 323 | zero_user(page, 0, PAGE_SIZE); |
ccd979bd MF |
324 | SetPageUptodate(page); |
325 | ret = 0; | |
326 | goto out_alloc; | |
327 | } | |
328 | ||
6798d35a MF |
329 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
330 | ret = ocfs2_readpage_inline(inode, page); | |
331 | else | |
332 | ret = block_read_full_page(page, ocfs2_get_block); | |
ccd979bd MF |
333 | unlock = 0; |
334 | ||
ccd979bd MF |
335 | out_alloc: |
336 | up_read(&OCFS2_I(inode)->ip_alloc_sem); | |
e63aecb6 MF |
337 | out_inode_unlock: |
338 | ocfs2_inode_unlock(inode, 0); | |
ccd979bd MF |
339 | out: |
340 | if (unlock) | |
341 | unlock_page(page); | |
ccd979bd MF |
342 | return ret; |
343 | } | |
344 | ||
628a24f5 MF |
345 | /* |
346 | * This is used only for read-ahead. Failures or difficult to handle | |
347 | * situations are safe to ignore. | |
348 | * | |
349 | * Right now, we don't bother with BH_Boundary - in-inode extent lists | |
350 | * are quite large (243 extents on 4k blocks), so most inodes don't | |
351 | * grow out to a tree. If need be, detecting boundary extents could | |
352 | * trivially be added in a future version of ocfs2_get_block(). | |
353 | */ | |
354 | static int ocfs2_readpages(struct file *filp, struct address_space *mapping, | |
355 | struct list_head *pages, unsigned nr_pages) | |
356 | { | |
357 | int ret, err = -EIO; | |
358 | struct inode *inode = mapping->host; | |
359 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
360 | loff_t start; | |
361 | struct page *last; | |
362 | ||
363 | /* | |
364 | * Use the nonblocking flag for the dlm code to avoid page | |
365 | * lock inversion, but don't bother with retrying. | |
366 | */ | |
367 | ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK); | |
368 | if (ret) | |
369 | return err; | |
370 | ||
371 | if (down_read_trylock(&oi->ip_alloc_sem) == 0) { | |
372 | ocfs2_inode_unlock(inode, 0); | |
373 | return err; | |
374 | } | |
375 | ||
376 | /* | |
377 | * Don't bother with inline-data. There isn't anything | |
378 | * to read-ahead in that case anyway... | |
379 | */ | |
380 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) | |
381 | goto out_unlock; | |
382 | ||
383 | /* | |
384 | * Check whether a remote node truncated this file - we just | |
385 | * drop out in that case as it's not worth handling here. | |
386 | */ | |
387 | last = list_entry(pages->prev, struct page, lru); | |
388 | start = (loff_t)last->index << PAGE_CACHE_SHIFT; | |
389 | if (start >= i_size_read(inode)) | |
390 | goto out_unlock; | |
391 | ||
392 | err = mpage_readpages(mapping, pages, nr_pages, ocfs2_get_block); | |
393 | ||
394 | out_unlock: | |
395 | up_read(&oi->ip_alloc_sem); | |
396 | ocfs2_inode_unlock(inode, 0); | |
397 | ||
398 | return err; | |
399 | } | |
400 | ||
ccd979bd MF |
401 | /* Note: Because we don't support holes, our allocation has |
402 | * already happened (allocation writes zeros to the file data) | |
403 | * so we don't have to worry about ordered writes in | |
404 | * ocfs2_writepage. | |
405 | * | |
406 | * ->writepage is called during the process of invalidating the page cache | |
407 | * during blocked lock processing. It can't block on any cluster locks | |
408 | * to during block mapping. It's relying on the fact that the block | |
409 | * mapping can't have disappeared under the dirty pages that it is | |
410 | * being asked to write back. | |
411 | */ | |
412 | static int ocfs2_writepage(struct page *page, struct writeback_control *wbc) | |
413 | { | |
9558156b TM |
414 | trace_ocfs2_writepage( |
415 | (unsigned long long)OCFS2_I(page->mapping->host)->ip_blkno, | |
416 | page->index); | |
ccd979bd | 417 | |
9558156b | 418 | return block_write_full_page(page, ocfs2_get_block, wbc); |
ccd979bd MF |
419 | } |
420 | ||
ccd979bd MF |
421 | /* Taken from ext3. We don't necessarily need the full blown |
422 | * functionality yet, but IMHO it's better to cut and paste the whole | |
423 | * thing so we can avoid introducing our own bugs (and easily pick up | |
424 | * their fixes when they happen) --Mark */ | |
60b11392 MF |
425 | int walk_page_buffers( handle_t *handle, |
426 | struct buffer_head *head, | |
427 | unsigned from, | |
428 | unsigned to, | |
429 | int *partial, | |
430 | int (*fn)( handle_t *handle, | |
431 | struct buffer_head *bh)) | |
ccd979bd MF |
432 | { |
433 | struct buffer_head *bh; | |
434 | unsigned block_start, block_end; | |
435 | unsigned blocksize = head->b_size; | |
436 | int err, ret = 0; | |
437 | struct buffer_head *next; | |
438 | ||
439 | for ( bh = head, block_start = 0; | |
440 | ret == 0 && (bh != head || !block_start); | |
441 | block_start = block_end, bh = next) | |
442 | { | |
443 | next = bh->b_this_page; | |
444 | block_end = block_start + blocksize; | |
445 | if (block_end <= from || block_start >= to) { | |
446 | if (partial && !buffer_uptodate(bh)) | |
447 | *partial = 1; | |
448 | continue; | |
449 | } | |
450 | err = (*fn)(handle, bh); | |
451 | if (!ret) | |
452 | ret = err; | |
453 | } | |
454 | return ret; | |
455 | } | |
456 | ||
ccd979bd MF |
457 | static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block) |
458 | { | |
459 | sector_t status; | |
460 | u64 p_blkno = 0; | |
461 | int err = 0; | |
462 | struct inode *inode = mapping->host; | |
463 | ||
9558156b TM |
464 | trace_ocfs2_bmap((unsigned long long)OCFS2_I(inode)->ip_blkno, |
465 | (unsigned long long)block); | |
ccd979bd MF |
466 | |
467 | /* We don't need to lock journal system files, since they aren't | |
468 | * accessed concurrently from multiple nodes. | |
469 | */ | |
470 | if (!INODE_JOURNAL(inode)) { | |
e63aecb6 | 471 | err = ocfs2_inode_lock(inode, NULL, 0); |
ccd979bd MF |
472 | if (err) { |
473 | if (err != -ENOENT) | |
474 | mlog_errno(err); | |
475 | goto bail; | |
476 | } | |
477 | down_read(&OCFS2_I(inode)->ip_alloc_sem); | |
478 | } | |
479 | ||
6798d35a MF |
480 | if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) |
481 | err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL, | |
482 | NULL); | |
ccd979bd MF |
483 | |
484 | if (!INODE_JOURNAL(inode)) { | |
485 | up_read(&OCFS2_I(inode)->ip_alloc_sem); | |
e63aecb6 | 486 | ocfs2_inode_unlock(inode, 0); |
ccd979bd MF |
487 | } |
488 | ||
489 | if (err) { | |
490 | mlog(ML_ERROR, "get_blocks() failed, block = %llu\n", | |
491 | (unsigned long long)block); | |
492 | mlog_errno(err); | |
493 | goto bail; | |
494 | } | |
495 | ||
ccd979bd MF |
496 | bail: |
497 | status = err ? 0 : p_blkno; | |
498 | ||
ccd979bd MF |
499 | return status; |
500 | } | |
501 | ||
502 | /* | |
503 | * TODO: Make this into a generic get_blocks function. | |
504 | * | |
505 | * From do_direct_io in direct-io.c: | |
506 | * "So what we do is to permit the ->get_blocks function to populate | |
507 | * bh.b_size with the size of IO which is permitted at this offset and | |
508 | * this i_blkbits." | |
509 | * | |
510 | * This function is called directly from get_more_blocks in direct-io.c. | |
511 | * | |
512 | * called like this: dio->get_blocks(dio->inode, fs_startblk, | |
513 | * fs_count, map_bh, dio->rw == WRITE); | |
514 | */ | |
515 | static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock, | |
ccd979bd MF |
516 | struct buffer_head *bh_result, int create) |
517 | { | |
518 | int ret; | |
49255dce JQ |
519 | u32 cpos = 0; |
520 | int alloc_locked = 0; | |
4f902c37 | 521 | u64 p_blkno, inode_blocks, contig_blocks; |
49cb8d2d | 522 | unsigned int ext_flags; |
184d7d20 | 523 | unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; |
1d8fa7a2 | 524 | unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; |
49255dce | 525 | unsigned long len = bh_result->b_size; |
ae1f0814 | 526 | unsigned int clusters_to_alloc = 0, contig_clusters = 0; |
49255dce JQ |
527 | |
528 | cpos = ocfs2_blocks_to_clusters(inode->i_sb, iblock); | |
ccd979bd | 529 | |
ccd979bd MF |
530 | /* This function won't even be called if the request isn't all |
531 | * nicely aligned and of the right size, so there's no need | |
532 | * for us to check any of that. */ | |
533 | ||
25baf2da | 534 | inode_blocks = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); |
564f8a32 | 535 | |
6ab855a9 WW |
536 | down_read(&OCFS2_I(inode)->ip_alloc_sem); |
537 | ||
ccd979bd MF |
538 | /* This figures out the size of the next contiguous block, and |
539 | * our logical offset */ | |
363041a5 | 540 | ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, |
49cb8d2d | 541 | &contig_blocks, &ext_flags); |
6ab855a9 WW |
542 | up_read(&OCFS2_I(inode)->ip_alloc_sem); |
543 | ||
ccd979bd MF |
544 | if (ret) { |
545 | mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n", | |
546 | (unsigned long long)iblock); | |
547 | ret = -EIO; | |
548 | goto bail; | |
549 | } | |
550 | ||
cbaee472 TM |
551 | /* We should already CoW the refcounted extent in case of create. */ |
552 | BUG_ON(create && (ext_flags & OCFS2_EXT_REFCOUNTED)); | |
553 | ||
49255dce JQ |
554 | /* allocate blocks if no p_blkno is found, and create == 1 */ |
555 | if (!p_blkno && create) { | |
556 | ret = ocfs2_inode_lock(inode, NULL, 1); | |
557 | if (ret < 0) { | |
558 | mlog_errno(ret); | |
559 | goto bail; | |
560 | } | |
561 | ||
562 | alloc_locked = 1; | |
563 | ||
6ab855a9 WW |
564 | down_write(&OCFS2_I(inode)->ip_alloc_sem); |
565 | ||
49255dce JQ |
566 | /* fill hole, allocate blocks can't be larger than the size |
567 | * of the hole */ | |
568 | clusters_to_alloc = ocfs2_clusters_for_bytes(inode->i_sb, len); | |
ae1f0814 JQ |
569 | contig_clusters = ocfs2_clusters_for_blocks(inode->i_sb, |
570 | contig_blocks); | |
571 | if (clusters_to_alloc > contig_clusters) | |
572 | clusters_to_alloc = contig_clusters; | |
49255dce JQ |
573 | |
574 | /* allocate extent and insert them into the extent tree */ | |
575 | ret = ocfs2_extend_allocation(inode, cpos, | |
576 | clusters_to_alloc, 0); | |
577 | if (ret < 0) { | |
6ab855a9 | 578 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
49255dce JQ |
579 | mlog_errno(ret); |
580 | goto bail; | |
581 | } | |
582 | ||
583 | ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, | |
584 | &contig_blocks, &ext_flags); | |
585 | if (ret < 0) { | |
6ab855a9 | 586 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
49255dce JQ |
587 | mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n", |
588 | (unsigned long long)iblock); | |
589 | ret = -EIO; | |
590 | goto bail; | |
591 | } | |
4e357b93 | 592 | set_buffer_new(bh_result); |
6ab855a9 | 593 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
49255dce JQ |
594 | } |
595 | ||
25baf2da MF |
596 | /* |
597 | * get_more_blocks() expects us to describe a hole by clearing | |
598 | * the mapped bit on bh_result(). | |
49cb8d2d MF |
599 | * |
600 | * Consider an unwritten extent as a hole. | |
25baf2da | 601 | */ |
49cb8d2d | 602 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) |
25baf2da | 603 | map_bh(bh_result, inode->i_sb, p_blkno); |
5fe878ae | 604 | else |
25baf2da | 605 | clear_buffer_mapped(bh_result); |
ccd979bd MF |
606 | |
607 | /* make sure we don't map more than max_blocks blocks here as | |
608 | that's all the kernel will handle at this point. */ | |
609 | if (max_blocks < contig_blocks) | |
610 | contig_blocks = max_blocks; | |
611 | bh_result->b_size = contig_blocks << blocksize_bits; | |
612 | bail: | |
49255dce JQ |
613 | if (alloc_locked) |
614 | ocfs2_inode_unlock(inode, 1); | |
ccd979bd MF |
615 | return ret; |
616 | } | |
617 | ||
2bd63216 | 618 | /* |
ccd979bd | 619 | * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're |
bd5fe6c5 CH |
620 | * particularly interested in the aio/dio case. We use the rw_lock DLM lock |
621 | * to protect io on one node from truncation on another. | |
ccd979bd MF |
622 | */ |
623 | static void ocfs2_dio_end_io(struct kiocb *iocb, | |
624 | loff_t offset, | |
625 | ssize_t bytes, | |
7b7a8665 | 626 | void *private) |
ccd979bd | 627 | { |
496ad9aa | 628 | struct inode *inode = file_inode(iocb->ki_filp); |
7cdfc3a1 | 629 | int level; |
ccd979bd MF |
630 | |
631 | /* this io's submitter should not have unlocked this before we could */ | |
632 | BUG_ON(!ocfs2_iocb_is_rw_locked(iocb)); | |
7cdfc3a1 | 633 | |
a11f7e63 MF |
634 | if (ocfs2_iocb_is_unaligned_aio(iocb)) { |
635 | ocfs2_iocb_clear_unaligned_aio(iocb); | |
636 | ||
c18ceab0 | 637 | mutex_unlock(&OCFS2_I(inode)->ip_unaligned_aio); |
a11f7e63 MF |
638 | } |
639 | ||
512f62ac JQ |
640 | /* Let rw unlock to be done later to protect append direct io write */ |
641 | if (offset + bytes <= i_size_read(inode)) { | |
642 | ocfs2_iocb_clear_rw_locked(iocb); | |
7cdfc3a1 | 643 | |
512f62ac JQ |
644 | level = ocfs2_iocb_rw_locked_level(iocb); |
645 | ocfs2_rw_unlock(inode, level); | |
646 | } | |
ccd979bd MF |
647 | } |
648 | ||
03f981cf JB |
649 | static int ocfs2_releasepage(struct page *page, gfp_t wait) |
650 | { | |
03f981cf JB |
651 | if (!page_has_buffers(page)) |
652 | return 0; | |
41ecc345 | 653 | return try_to_free_buffers(page); |
03f981cf JB |
654 | } |
655 | ||
24c40b32 JQ |
656 | static int ocfs2_is_overwrite(struct ocfs2_super *osb, |
657 | struct inode *inode, loff_t offset) | |
658 | { | |
659 | int ret = 0; | |
660 | u32 v_cpos = 0; | |
661 | u32 p_cpos = 0; | |
662 | unsigned int num_clusters = 0; | |
663 | unsigned int ext_flags = 0; | |
664 | ||
665 | v_cpos = ocfs2_bytes_to_clusters(osb->sb, offset); | |
666 | ret = ocfs2_get_clusters(inode, v_cpos, &p_cpos, | |
667 | &num_clusters, &ext_flags); | |
668 | if (ret < 0) { | |
669 | mlog_errno(ret); | |
670 | return ret; | |
671 | } | |
672 | ||
673 | if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) | |
674 | return 1; | |
675 | ||
676 | return 0; | |
677 | } | |
678 | ||
14a5275d JQ |
679 | static int ocfs2_direct_IO_zero_extend(struct ocfs2_super *osb, |
680 | struct inode *inode, loff_t offset, | |
681 | u64 zero_len, int cluster_align) | |
682 | { | |
683 | u32 p_cpos = 0; | |
684 | u32 v_cpos = ocfs2_bytes_to_clusters(osb->sb, i_size_read(inode)); | |
685 | unsigned int num_clusters = 0; | |
686 | unsigned int ext_flags = 0; | |
687 | int ret = 0; | |
688 | ||
689 | if (offset <= i_size_read(inode) || cluster_align) | |
690 | return 0; | |
691 | ||
692 | ret = ocfs2_get_clusters(inode, v_cpos, &p_cpos, &num_clusters, | |
693 | &ext_flags); | |
694 | if (ret < 0) { | |
695 | mlog_errno(ret); | |
696 | return ret; | |
697 | } | |
698 | ||
699 | if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) { | |
700 | u64 s = i_size_read(inode); | |
32e5a2a2 | 701 | sector_t sector = ((u64)p_cpos << (osb->s_clustersize_bits - 9)) + |
14a5275d JQ |
702 | (do_div(s, osb->s_clustersize) >> 9); |
703 | ||
704 | ret = blkdev_issue_zeroout(osb->sb->s_bdev, sector, | |
705 | zero_len >> 9, GFP_NOFS, false); | |
706 | if (ret < 0) | |
707 | mlog_errno(ret); | |
708 | } | |
709 | ||
710 | return ret; | |
711 | } | |
712 | ||
713 | static int ocfs2_direct_IO_extend_no_holes(struct ocfs2_super *osb, | |
714 | struct inode *inode, loff_t offset) | |
715 | { | |
716 | u64 zero_start, zero_len, total_zero_len; | |
717 | u32 p_cpos = 0, clusters_to_add; | |
718 | u32 v_cpos = ocfs2_bytes_to_clusters(osb->sb, i_size_read(inode)); | |
719 | unsigned int num_clusters = 0; | |
720 | unsigned int ext_flags = 0; | |
721 | u32 size_div, offset_div; | |
722 | int ret = 0; | |
723 | ||
724 | { | |
725 | u64 o = offset; | |
726 | u64 s = i_size_read(inode); | |
727 | ||
728 | offset_div = do_div(o, osb->s_clustersize); | |
729 | size_div = do_div(s, osb->s_clustersize); | |
730 | } | |
731 | ||
732 | if (offset <= i_size_read(inode)) | |
733 | return 0; | |
734 | ||
735 | clusters_to_add = ocfs2_bytes_to_clusters(inode->i_sb, offset) - | |
736 | ocfs2_bytes_to_clusters(inode->i_sb, i_size_read(inode)); | |
737 | total_zero_len = offset - i_size_read(inode); | |
738 | if (clusters_to_add) | |
739 | total_zero_len -= offset_div; | |
740 | ||
741 | /* Allocate clusters to fill out holes, and this is only needed | |
742 | * when we add more than one clusters. Otherwise the cluster will | |
743 | * be allocated during direct IO */ | |
744 | if (clusters_to_add > 1) { | |
745 | ret = ocfs2_extend_allocation(inode, | |
746 | OCFS2_I(inode)->ip_clusters, | |
747 | clusters_to_add - 1, 0); | |
748 | if (ret) { | |
749 | mlog_errno(ret); | |
750 | goto out; | |
751 | } | |
752 | } | |
753 | ||
754 | while (total_zero_len) { | |
755 | ret = ocfs2_get_clusters(inode, v_cpos, &p_cpos, &num_clusters, | |
756 | &ext_flags); | |
757 | if (ret < 0) { | |
758 | mlog_errno(ret); | |
759 | goto out; | |
760 | } | |
761 | ||
762 | zero_start = ocfs2_clusters_to_bytes(osb->sb, p_cpos) + | |
763 | size_div; | |
764 | zero_len = ocfs2_clusters_to_bytes(osb->sb, num_clusters) - | |
765 | size_div; | |
766 | zero_len = min(total_zero_len, zero_len); | |
767 | ||
768 | if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) { | |
769 | ret = blkdev_issue_zeroout(osb->sb->s_bdev, | |
770 | zero_start >> 9, zero_len >> 9, | |
771 | GFP_NOFS, false); | |
772 | if (ret < 0) { | |
773 | mlog_errno(ret); | |
774 | goto out; | |
775 | } | |
776 | } | |
777 | ||
778 | total_zero_len -= zero_len; | |
779 | v_cpos += ocfs2_bytes_to_clusters(osb->sb, zero_len + size_div); | |
780 | ||
781 | /* Only at first iteration can be cluster not aligned. | |
782 | * So set size_div to 0 for the rest */ | |
783 | size_div = 0; | |
784 | } | |
785 | ||
786 | out: | |
787 | return ret; | |
788 | } | |
789 | ||
24c40b32 JQ |
790 | static ssize_t ocfs2_direct_IO_write(struct kiocb *iocb, |
791 | struct iov_iter *iter, | |
792 | loff_t offset) | |
793 | { | |
794 | ssize_t ret = 0; | |
795 | ssize_t written = 0; | |
796 | bool orphaned = false; | |
797 | int is_overwrite = 0; | |
798 | struct file *file = iocb->ki_filp; | |
799 | struct inode *inode = file_inode(file)->i_mapping->host; | |
800 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
801 | struct buffer_head *di_bh = NULL; | |
802 | size_t count = iter->count; | |
803 | journal_t *journal = osb->journal->j_journal; | |
14a5275d JQ |
804 | u64 zero_len_head, zero_len_tail; |
805 | int cluster_align_head, cluster_align_tail; | |
24c40b32 JQ |
806 | loff_t final_size = offset + count; |
807 | int append_write = offset >= i_size_read(inode) ? 1 : 0; | |
808 | unsigned int num_clusters = 0; | |
809 | unsigned int ext_flags = 0; | |
810 | ||
811 | { | |
812 | u64 o = offset; | |
14a5275d JQ |
813 | u64 s = i_size_read(inode); |
814 | ||
815 | zero_len_head = do_div(o, 1 << osb->s_clustersize_bits); | |
816 | cluster_align_head = !zero_len_head; | |
24c40b32 | 817 | |
14a5275d JQ |
818 | zero_len_tail = osb->s_clustersize - |
819 | do_div(s, osb->s_clustersize); | |
820 | if ((offset - i_size_read(inode)) < zero_len_tail) | |
821 | zero_len_tail = offset - i_size_read(inode); | |
822 | cluster_align_tail = !zero_len_tail; | |
24c40b32 JQ |
823 | } |
824 | ||
825 | /* | |
826 | * when final_size > inode->i_size, inode->i_size will be | |
827 | * updated after direct write, so add the inode to orphan | |
828 | * dir first. | |
829 | */ | |
830 | if (final_size > i_size_read(inode)) { | |
831 | ret = ocfs2_add_inode_to_orphan(osb, inode); | |
832 | if (ret < 0) { | |
833 | mlog_errno(ret); | |
834 | goto out; | |
835 | } | |
836 | orphaned = true; | |
837 | } | |
838 | ||
839 | if (append_write) { | |
7e9b1955 | 840 | ret = ocfs2_inode_lock(inode, NULL, 1); |
24c40b32 JQ |
841 | if (ret < 0) { |
842 | mlog_errno(ret); | |
843 | goto clean_orphan; | |
844 | } | |
845 | ||
14a5275d JQ |
846 | /* zeroing out the previously allocated cluster tail |
847 | * that but not zeroed */ | |
6ab855a9 WW |
848 | if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) { |
849 | down_read(&OCFS2_I(inode)->ip_alloc_sem); | |
14a5275d JQ |
850 | ret = ocfs2_direct_IO_zero_extend(osb, inode, offset, |
851 | zero_len_tail, cluster_align_tail); | |
6ab855a9 WW |
852 | up_read(&OCFS2_I(inode)->ip_alloc_sem); |
853 | } else { | |
854 | down_write(&OCFS2_I(inode)->ip_alloc_sem); | |
14a5275d | 855 | ret = ocfs2_direct_IO_extend_no_holes(osb, inode, |
24c40b32 | 856 | offset); |
6ab855a9 WW |
857 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
858 | } | |
24c40b32 JQ |
859 | if (ret < 0) { |
860 | mlog_errno(ret); | |
861 | ocfs2_inode_unlock(inode, 1); | |
24c40b32 JQ |
862 | goto clean_orphan; |
863 | } | |
864 | ||
865 | is_overwrite = ocfs2_is_overwrite(osb, inode, offset); | |
866 | if (is_overwrite < 0) { | |
867 | mlog_errno(is_overwrite); | |
d162eaad | 868 | ret = is_overwrite; |
24c40b32 | 869 | ocfs2_inode_unlock(inode, 1); |
24c40b32 JQ |
870 | goto clean_orphan; |
871 | } | |
872 | ||
873 | ocfs2_inode_unlock(inode, 1); | |
24c40b32 JQ |
874 | } |
875 | ||
17f8c842 OS |
876 | written = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter, |
877 | offset, ocfs2_direct_IO_get_blocks, | |
878 | ocfs2_dio_end_io, NULL, 0); | |
faaebf18 JQ |
879 | /* overwrite aio may return -EIOCBQUEUED, and it is not an error */ |
880 | if ((written < 0) && (written != -EIOCBQUEUED)) { | |
24c40b32 JQ |
881 | loff_t i_size = i_size_read(inode); |
882 | ||
883 | if (offset + count > i_size) { | |
884 | ret = ocfs2_inode_lock(inode, &di_bh, 1); | |
885 | if (ret < 0) { | |
886 | mlog_errno(ret); | |
887 | goto clean_orphan; | |
888 | } | |
889 | ||
890 | if (i_size == i_size_read(inode)) { | |
891 | ret = ocfs2_truncate_file(inode, di_bh, | |
892 | i_size); | |
893 | if (ret < 0) { | |
894 | if (ret != -ENOSPC) | |
895 | mlog_errno(ret); | |
896 | ||
897 | ocfs2_inode_unlock(inode, 1); | |
898 | brelse(di_bh); | |
faaebf18 | 899 | di_bh = NULL; |
24c40b32 JQ |
900 | goto clean_orphan; |
901 | } | |
902 | } | |
903 | ||
904 | ocfs2_inode_unlock(inode, 1); | |
905 | brelse(di_bh); | |
faaebf18 | 906 | di_bh = NULL; |
24c40b32 JQ |
907 | |
908 | ret = jbd2_journal_force_commit(journal); | |
909 | if (ret < 0) | |
910 | mlog_errno(ret); | |
911 | } | |
bdd86215 | 912 | } else if (written > 0 && append_write && !is_overwrite && |
14a5275d JQ |
913 | !cluster_align_head) { |
914 | /* zeroing out the allocated cluster head */ | |
24c40b32 JQ |
915 | u32 p_cpos = 0; |
916 | u32 v_cpos = ocfs2_bytes_to_clusters(osb->sb, offset); | |
917 | ||
37a8d89a JQ |
918 | ret = ocfs2_inode_lock(inode, NULL, 0); |
919 | if (ret < 0) { | |
920 | mlog_errno(ret); | |
921 | goto clean_orphan; | |
922 | } | |
923 | ||
24c40b32 JQ |
924 | ret = ocfs2_get_clusters(inode, v_cpos, &p_cpos, |
925 | &num_clusters, &ext_flags); | |
926 | if (ret < 0) { | |
927 | mlog_errno(ret); | |
37a8d89a | 928 | ocfs2_inode_unlock(inode, 0); |
24c40b32 JQ |
929 | goto clean_orphan; |
930 | } | |
931 | ||
932 | BUG_ON(!p_cpos || (ext_flags & OCFS2_EXT_UNWRITTEN)); | |
933 | ||
934 | ret = blkdev_issue_zeroout(osb->sb->s_bdev, | |
32e5a2a2 | 935 | (u64)p_cpos << (osb->s_clustersize_bits - 9), |
14a5275d | 936 | zero_len_head >> 9, GFP_NOFS, false); |
24c40b32 JQ |
937 | if (ret < 0) |
938 | mlog_errno(ret); | |
37a8d89a JQ |
939 | |
940 | ocfs2_inode_unlock(inode, 0); | |
24c40b32 JQ |
941 | } |
942 | ||
943 | clean_orphan: | |
944 | if (orphaned) { | |
945 | int tmp_ret; | |
946 | int update_isize = written > 0 ? 1 : 0; | |
947 | loff_t end = update_isize ? offset + written : 0; | |
948 | ||
cf1776a9 JQ |
949 | tmp_ret = ocfs2_inode_lock(inode, &di_bh, 1); |
950 | if (tmp_ret < 0) { | |
951 | ret = tmp_ret; | |
952 | mlog_errno(ret); | |
953 | goto out; | |
954 | } | |
955 | ||
956 | tmp_ret = ocfs2_del_inode_from_orphan(osb, inode, di_bh, | |
24c40b32 JQ |
957 | update_isize, end); |
958 | if (tmp_ret < 0) { | |
959 | ret = tmp_ret; | |
cf1776a9 | 960 | mlog_errno(ret); |
faaebf18 | 961 | brelse(di_bh); |
24c40b32 JQ |
962 | goto out; |
963 | } | |
964 | ||
cf1776a9 | 965 | ocfs2_inode_unlock(inode, 1); |
faaebf18 | 966 | brelse(di_bh); |
cf1776a9 | 967 | |
24c40b32 JQ |
968 | tmp_ret = jbd2_journal_force_commit(journal); |
969 | if (tmp_ret < 0) { | |
970 | ret = tmp_ret; | |
971 | mlog_errno(tmp_ret); | |
972 | } | |
973 | } | |
974 | ||
975 | out: | |
976 | if (ret >= 0) | |
977 | ret = written; | |
978 | return ret; | |
979 | } | |
980 | ||
22c6186e | 981 | static ssize_t ocfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter, |
d8d3d94b | 982 | loff_t offset) |
ccd979bd MF |
983 | { |
984 | struct file *file = iocb->ki_filp; | |
496ad9aa | 985 | struct inode *inode = file_inode(file)->i_mapping->host; |
24c40b32 JQ |
986 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
987 | int full_coherency = !(osb->s_mount_opt & | |
988 | OCFS2_MOUNT_COHERENCY_BUFFERED); | |
53013cba | 989 | |
6798d35a MF |
990 | /* |
991 | * Fallback to buffered I/O if we see an inode without | |
992 | * extents. | |
993 | */ | |
994 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) | |
995 | return 0; | |
996 | ||
24c40b32 JQ |
997 | /* Fallback to buffered I/O if we are appending and |
998 | * concurrent O_DIRECT writes are allowed. | |
999 | */ | |
1000 | if (i_size_read(inode) <= offset && !full_coherency) | |
b80474b4 TM |
1001 | return 0; |
1002 | ||
6f673763 | 1003 | if (iov_iter_rw(iter) == READ) |
17f8c842 OS |
1004 | return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, |
1005 | iter, offset, | |
1006 | ocfs2_direct_IO_get_blocks, | |
1007 | ocfs2_dio_end_io, NULL, 0); | |
24c40b32 JQ |
1008 | else |
1009 | return ocfs2_direct_IO_write(iocb, iter, offset); | |
ccd979bd MF |
1010 | } |
1011 | ||
9517bac6 MF |
1012 | static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb, |
1013 | u32 cpos, | |
1014 | unsigned int *start, | |
1015 | unsigned int *end) | |
1016 | { | |
1017 | unsigned int cluster_start = 0, cluster_end = PAGE_CACHE_SIZE; | |
1018 | ||
1019 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) { | |
1020 | unsigned int cpp; | |
1021 | ||
1022 | cpp = 1 << (PAGE_CACHE_SHIFT - osb->s_clustersize_bits); | |
1023 | ||
1024 | cluster_start = cpos % cpp; | |
1025 | cluster_start = cluster_start << osb->s_clustersize_bits; | |
1026 | ||
1027 | cluster_end = cluster_start + osb->s_clustersize; | |
1028 | } | |
1029 | ||
1030 | BUG_ON(cluster_start > PAGE_SIZE); | |
1031 | BUG_ON(cluster_end > PAGE_SIZE); | |
1032 | ||
1033 | if (start) | |
1034 | *start = cluster_start; | |
1035 | if (end) | |
1036 | *end = cluster_end; | |
1037 | } | |
1038 | ||
1039 | /* | |
1040 | * 'from' and 'to' are the region in the page to avoid zeroing. | |
1041 | * | |
1042 | * If pagesize > clustersize, this function will avoid zeroing outside | |
1043 | * of the cluster boundary. | |
1044 | * | |
1045 | * from == to == 0 is code for "zero the entire cluster region" | |
1046 | */ | |
1047 | static void ocfs2_clear_page_regions(struct page *page, | |
1048 | struct ocfs2_super *osb, u32 cpos, | |
1049 | unsigned from, unsigned to) | |
1050 | { | |
1051 | void *kaddr; | |
1052 | unsigned int cluster_start, cluster_end; | |
1053 | ||
1054 | ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end); | |
1055 | ||
c4bc8dcb | 1056 | kaddr = kmap_atomic(page); |
9517bac6 MF |
1057 | |
1058 | if (from || to) { | |
1059 | if (from > cluster_start) | |
1060 | memset(kaddr + cluster_start, 0, from - cluster_start); | |
1061 | if (to < cluster_end) | |
1062 | memset(kaddr + to, 0, cluster_end - to); | |
1063 | } else { | |
1064 | memset(kaddr + cluster_start, 0, cluster_end - cluster_start); | |
1065 | } | |
1066 | ||
c4bc8dcb | 1067 | kunmap_atomic(kaddr); |
9517bac6 MF |
1068 | } |
1069 | ||
4e9563fd MF |
1070 | /* |
1071 | * Nonsparse file systems fully allocate before we get to the write | |
1072 | * code. This prevents ocfs2_write() from tagging the write as an | |
1073 | * allocating one, which means ocfs2_map_page_blocks() might try to | |
1074 | * read-in the blocks at the tail of our file. Avoid reading them by | |
1075 | * testing i_size against each block offset. | |
1076 | */ | |
1077 | static int ocfs2_should_read_blk(struct inode *inode, struct page *page, | |
1078 | unsigned int block_start) | |
1079 | { | |
1080 | u64 offset = page_offset(page) + block_start; | |
1081 | ||
1082 | if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) | |
1083 | return 1; | |
1084 | ||
1085 | if (i_size_read(inode) > offset) | |
1086 | return 1; | |
1087 | ||
1088 | return 0; | |
1089 | } | |
1090 | ||
9517bac6 | 1091 | /* |
ebdec241 | 1092 | * Some of this taken from __block_write_begin(). We already have our |
9517bac6 MF |
1093 | * mapping by now though, and the entire write will be allocating or |
1094 | * it won't, so not much need to use BH_New. | |
1095 | * | |
1096 | * This will also skip zeroing, which is handled externally. | |
1097 | */ | |
60b11392 MF |
1098 | int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno, |
1099 | struct inode *inode, unsigned int from, | |
1100 | unsigned int to, int new) | |
9517bac6 MF |
1101 | { |
1102 | int ret = 0; | |
1103 | struct buffer_head *head, *bh, *wait[2], **wait_bh = wait; | |
1104 | unsigned int block_end, block_start; | |
1105 | unsigned int bsize = 1 << inode->i_blkbits; | |
1106 | ||
1107 | if (!page_has_buffers(page)) | |
1108 | create_empty_buffers(page, bsize, 0); | |
1109 | ||
1110 | head = page_buffers(page); | |
1111 | for (bh = head, block_start = 0; bh != head || !block_start; | |
1112 | bh = bh->b_this_page, block_start += bsize) { | |
1113 | block_end = block_start + bsize; | |
1114 | ||
3a307ffc MF |
1115 | clear_buffer_new(bh); |
1116 | ||
9517bac6 MF |
1117 | /* |
1118 | * Ignore blocks outside of our i/o range - | |
1119 | * they may belong to unallocated clusters. | |
1120 | */ | |
60b11392 | 1121 | if (block_start >= to || block_end <= from) { |
9517bac6 MF |
1122 | if (PageUptodate(page)) |
1123 | set_buffer_uptodate(bh); | |
1124 | continue; | |
1125 | } | |
1126 | ||
1127 | /* | |
1128 | * For an allocating write with cluster size >= page | |
1129 | * size, we always write the entire page. | |
1130 | */ | |
3a307ffc MF |
1131 | if (new) |
1132 | set_buffer_new(bh); | |
9517bac6 MF |
1133 | |
1134 | if (!buffer_mapped(bh)) { | |
1135 | map_bh(bh, inode->i_sb, *p_blkno); | |
1136 | unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); | |
1137 | } | |
1138 | ||
1139 | if (PageUptodate(page)) { | |
1140 | if (!buffer_uptodate(bh)) | |
1141 | set_buffer_uptodate(bh); | |
1142 | } else if (!buffer_uptodate(bh) && !buffer_delay(bh) && | |
bce99768 | 1143 | !buffer_new(bh) && |
4e9563fd | 1144 | ocfs2_should_read_blk(inode, page, block_start) && |
bce99768 | 1145 | (block_start < from || block_end > to)) { |
9517bac6 MF |
1146 | ll_rw_block(READ, 1, &bh); |
1147 | *wait_bh++=bh; | |
1148 | } | |
1149 | ||
1150 | *p_blkno = *p_blkno + 1; | |
1151 | } | |
1152 | ||
1153 | /* | |
1154 | * If we issued read requests - let them complete. | |
1155 | */ | |
1156 | while(wait_bh > wait) { | |
1157 | wait_on_buffer(*--wait_bh); | |
1158 | if (!buffer_uptodate(*wait_bh)) | |
1159 | ret = -EIO; | |
1160 | } | |
1161 | ||
1162 | if (ret == 0 || !new) | |
1163 | return ret; | |
1164 | ||
1165 | /* | |
1166 | * If we get -EIO above, zero out any newly allocated blocks | |
1167 | * to avoid exposing stale data. | |
1168 | */ | |
1169 | bh = head; | |
1170 | block_start = 0; | |
1171 | do { | |
9517bac6 MF |
1172 | block_end = block_start + bsize; |
1173 | if (block_end <= from) | |
1174 | goto next_bh; | |
1175 | if (block_start >= to) | |
1176 | break; | |
1177 | ||
eebd2aa3 | 1178 | zero_user(page, block_start, bh->b_size); |
9517bac6 MF |
1179 | set_buffer_uptodate(bh); |
1180 | mark_buffer_dirty(bh); | |
1181 | ||
1182 | next_bh: | |
1183 | block_start = block_end; | |
1184 | bh = bh->b_this_page; | |
1185 | } while (bh != head); | |
1186 | ||
1187 | return ret; | |
1188 | } | |
1189 | ||
3a307ffc MF |
1190 | #if (PAGE_CACHE_SIZE >= OCFS2_MAX_CLUSTERSIZE) |
1191 | #define OCFS2_MAX_CTXT_PAGES 1 | |
1192 | #else | |
1193 | #define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_CACHE_SIZE) | |
1194 | #endif | |
1195 | ||
1196 | #define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_CACHE_SIZE / OCFS2_MIN_CLUSTERSIZE) | |
1197 | ||
6af67d82 | 1198 | /* |
3a307ffc | 1199 | * Describe the state of a single cluster to be written to. |
6af67d82 | 1200 | */ |
3a307ffc MF |
1201 | struct ocfs2_write_cluster_desc { |
1202 | u32 c_cpos; | |
1203 | u32 c_phys; | |
1204 | /* | |
1205 | * Give this a unique field because c_phys eventually gets | |
1206 | * filled. | |
1207 | */ | |
1208 | unsigned c_new; | |
b27b7cbc | 1209 | unsigned c_unwritten; |
e7432675 | 1210 | unsigned c_needs_zero; |
3a307ffc | 1211 | }; |
6af67d82 | 1212 | |
3a307ffc MF |
1213 | struct ocfs2_write_ctxt { |
1214 | /* Logical cluster position / len of write */ | |
1215 | u32 w_cpos; | |
1216 | u32 w_clen; | |
6af67d82 | 1217 | |
e7432675 SM |
1218 | /* First cluster allocated in a nonsparse extend */ |
1219 | u32 w_first_new_cpos; | |
1220 | ||
3a307ffc | 1221 | struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE]; |
6af67d82 | 1222 | |
3a307ffc MF |
1223 | /* |
1224 | * This is true if page_size > cluster_size. | |
1225 | * | |
1226 | * It triggers a set of special cases during write which might | |
1227 | * have to deal with allocating writes to partial pages. | |
1228 | */ | |
1229 | unsigned int w_large_pages; | |
6af67d82 | 1230 | |
3a307ffc MF |
1231 | /* |
1232 | * Pages involved in this write. | |
1233 | * | |
1234 | * w_target_page is the page being written to by the user. | |
1235 | * | |
1236 | * w_pages is an array of pages which always contains | |
1237 | * w_target_page, and in the case of an allocating write with | |
1238 | * page_size < cluster size, it will contain zero'd and mapped | |
1239 | * pages adjacent to w_target_page which need to be written | |
1240 | * out in so that future reads from that region will get | |
1241 | * zero's. | |
1242 | */ | |
3a307ffc | 1243 | unsigned int w_num_pages; |
83fd9c7f | 1244 | struct page *w_pages[OCFS2_MAX_CTXT_PAGES]; |
3a307ffc | 1245 | struct page *w_target_page; |
eeb47d12 | 1246 | |
5cffff9e WW |
1247 | /* |
1248 | * w_target_locked is used for page_mkwrite path indicating no unlocking | |
1249 | * against w_target_page in ocfs2_write_end_nolock. | |
1250 | */ | |
1251 | unsigned int w_target_locked:1; | |
1252 | ||
3a307ffc MF |
1253 | /* |
1254 | * ocfs2_write_end() uses this to know what the real range to | |
1255 | * write in the target should be. | |
1256 | */ | |
1257 | unsigned int w_target_from; | |
1258 | unsigned int w_target_to; | |
1259 | ||
1260 | /* | |
1261 | * We could use journal_current_handle() but this is cleaner, | |
1262 | * IMHO -Mark | |
1263 | */ | |
1264 | handle_t *w_handle; | |
1265 | ||
1266 | struct buffer_head *w_di_bh; | |
b27b7cbc MF |
1267 | |
1268 | struct ocfs2_cached_dealloc_ctxt w_dealloc; | |
3a307ffc MF |
1269 | }; |
1270 | ||
1d410a6e | 1271 | void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages) |
3a307ffc MF |
1272 | { |
1273 | int i; | |
1274 | ||
1d410a6e MF |
1275 | for(i = 0; i < num_pages; i++) { |
1276 | if (pages[i]) { | |
1277 | unlock_page(pages[i]); | |
1278 | mark_page_accessed(pages[i]); | |
1279 | page_cache_release(pages[i]); | |
1280 | } | |
6af67d82 | 1281 | } |
1d410a6e MF |
1282 | } |
1283 | ||
136f49b9 | 1284 | static void ocfs2_unlock_pages(struct ocfs2_write_ctxt *wc) |
1d410a6e | 1285 | { |
5cffff9e WW |
1286 | int i; |
1287 | ||
1288 | /* | |
1289 | * w_target_locked is only set to true in the page_mkwrite() case. | |
1290 | * The intent is to allow us to lock the target page from write_begin() | |
1291 | * to write_end(). The caller must hold a ref on w_target_page. | |
1292 | */ | |
1293 | if (wc->w_target_locked) { | |
1294 | BUG_ON(!wc->w_target_page); | |
1295 | for (i = 0; i < wc->w_num_pages; i++) { | |
1296 | if (wc->w_target_page == wc->w_pages[i]) { | |
1297 | wc->w_pages[i] = NULL; | |
1298 | break; | |
1299 | } | |
1300 | } | |
1301 | mark_page_accessed(wc->w_target_page); | |
1302 | page_cache_release(wc->w_target_page); | |
1303 | } | |
1d410a6e | 1304 | ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages); |
136f49b9 | 1305 | } |
6af67d82 | 1306 | |
136f49b9 JB |
1307 | static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt *wc) |
1308 | { | |
1309 | ocfs2_unlock_pages(wc); | |
3a307ffc MF |
1310 | brelse(wc->w_di_bh); |
1311 | kfree(wc); | |
1312 | } | |
1313 | ||
1314 | static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp, | |
1315 | struct ocfs2_super *osb, loff_t pos, | |
607d44aa | 1316 | unsigned len, struct buffer_head *di_bh) |
3a307ffc | 1317 | { |
30b8548f | 1318 | u32 cend; |
3a307ffc MF |
1319 | struct ocfs2_write_ctxt *wc; |
1320 | ||
1321 | wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS); | |
1322 | if (!wc) | |
1323 | return -ENOMEM; | |
6af67d82 | 1324 | |
3a307ffc | 1325 | wc->w_cpos = pos >> osb->s_clustersize_bits; |
e7432675 | 1326 | wc->w_first_new_cpos = UINT_MAX; |
30b8548f | 1327 | cend = (pos + len - 1) >> osb->s_clustersize_bits; |
1328 | wc->w_clen = cend - wc->w_cpos + 1; | |
607d44aa MF |
1329 | get_bh(di_bh); |
1330 | wc->w_di_bh = di_bh; | |
6af67d82 | 1331 | |
3a307ffc MF |
1332 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) |
1333 | wc->w_large_pages = 1; | |
1334 | else | |
1335 | wc->w_large_pages = 0; | |
1336 | ||
b27b7cbc MF |
1337 | ocfs2_init_dealloc_ctxt(&wc->w_dealloc); |
1338 | ||
3a307ffc | 1339 | *wcp = wc; |
6af67d82 | 1340 | |
3a307ffc | 1341 | return 0; |
6af67d82 MF |
1342 | } |
1343 | ||
9517bac6 | 1344 | /* |
3a307ffc MF |
1345 | * If a page has any new buffers, zero them out here, and mark them uptodate |
1346 | * and dirty so they'll be written out (in order to prevent uninitialised | |
1347 | * block data from leaking). And clear the new bit. | |
9517bac6 | 1348 | */ |
3a307ffc | 1349 | static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to) |
9517bac6 | 1350 | { |
3a307ffc MF |
1351 | unsigned int block_start, block_end; |
1352 | struct buffer_head *head, *bh; | |
9517bac6 | 1353 | |
3a307ffc MF |
1354 | BUG_ON(!PageLocked(page)); |
1355 | if (!page_has_buffers(page)) | |
1356 | return; | |
9517bac6 | 1357 | |
3a307ffc MF |
1358 | bh = head = page_buffers(page); |
1359 | block_start = 0; | |
1360 | do { | |
1361 | block_end = block_start + bh->b_size; | |
1362 | ||
1363 | if (buffer_new(bh)) { | |
1364 | if (block_end > from && block_start < to) { | |
1365 | if (!PageUptodate(page)) { | |
1366 | unsigned start, end; | |
3a307ffc MF |
1367 | |
1368 | start = max(from, block_start); | |
1369 | end = min(to, block_end); | |
1370 | ||
eebd2aa3 | 1371 | zero_user_segment(page, start, end); |
3a307ffc MF |
1372 | set_buffer_uptodate(bh); |
1373 | } | |
1374 | ||
1375 | clear_buffer_new(bh); | |
1376 | mark_buffer_dirty(bh); | |
1377 | } | |
1378 | } | |
9517bac6 | 1379 | |
3a307ffc MF |
1380 | block_start = block_end; |
1381 | bh = bh->b_this_page; | |
1382 | } while (bh != head); | |
1383 | } | |
1384 | ||
1385 | /* | |
1386 | * Only called when we have a failure during allocating write to write | |
1387 | * zero's to the newly allocated region. | |
1388 | */ | |
1389 | static void ocfs2_write_failure(struct inode *inode, | |
1390 | struct ocfs2_write_ctxt *wc, | |
1391 | loff_t user_pos, unsigned user_len) | |
1392 | { | |
1393 | int i; | |
5c26a7b7 MF |
1394 | unsigned from = user_pos & (PAGE_CACHE_SIZE - 1), |
1395 | to = user_pos + user_len; | |
3a307ffc MF |
1396 | struct page *tmppage; |
1397 | ||
5c26a7b7 | 1398 | ocfs2_zero_new_buffers(wc->w_target_page, from, to); |
9517bac6 | 1399 | |
3a307ffc MF |
1400 | for(i = 0; i < wc->w_num_pages; i++) { |
1401 | tmppage = wc->w_pages[i]; | |
9517bac6 | 1402 | |
961cecbe | 1403 | if (page_has_buffers(tmppage)) { |
53ef99ca | 1404 | if (ocfs2_should_order_data(inode)) |
2b4e30fb | 1405 | ocfs2_jbd2_file_inode(wc->w_handle, inode); |
961cecbe SM |
1406 | |
1407 | block_commit_write(tmppage, from, to); | |
1408 | } | |
9517bac6 | 1409 | } |
9517bac6 MF |
1410 | } |
1411 | ||
3a307ffc MF |
1412 | static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno, |
1413 | struct ocfs2_write_ctxt *wc, | |
1414 | struct page *page, u32 cpos, | |
1415 | loff_t user_pos, unsigned user_len, | |
1416 | int new) | |
9517bac6 | 1417 | { |
3a307ffc MF |
1418 | int ret; |
1419 | unsigned int map_from = 0, map_to = 0; | |
9517bac6 | 1420 | unsigned int cluster_start, cluster_end; |
3a307ffc | 1421 | unsigned int user_data_from = 0, user_data_to = 0; |
9517bac6 | 1422 | |
3a307ffc | 1423 | ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos, |
9517bac6 MF |
1424 | &cluster_start, &cluster_end); |
1425 | ||
272b62c1 GR |
1426 | /* treat the write as new if the a hole/lseek spanned across |
1427 | * the page boundary. | |
1428 | */ | |
1429 | new = new | ((i_size_read(inode) <= page_offset(page)) && | |
1430 | (page_offset(page) <= user_pos)); | |
1431 | ||
3a307ffc MF |
1432 | if (page == wc->w_target_page) { |
1433 | map_from = user_pos & (PAGE_CACHE_SIZE - 1); | |
1434 | map_to = map_from + user_len; | |
1435 | ||
1436 | if (new) | |
1437 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, | |
1438 | cluster_start, cluster_end, | |
1439 | new); | |
1440 | else | |
1441 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, | |
1442 | map_from, map_to, new); | |
1443 | if (ret) { | |
9517bac6 MF |
1444 | mlog_errno(ret); |
1445 | goto out; | |
1446 | } | |
1447 | ||
3a307ffc MF |
1448 | user_data_from = map_from; |
1449 | user_data_to = map_to; | |
9517bac6 | 1450 | if (new) { |
3a307ffc MF |
1451 | map_from = cluster_start; |
1452 | map_to = cluster_end; | |
9517bac6 MF |
1453 | } |
1454 | } else { | |
1455 | /* | |
1456 | * If we haven't allocated the new page yet, we | |
1457 | * shouldn't be writing it out without copying user | |
1458 | * data. This is likely a math error from the caller. | |
1459 | */ | |
1460 | BUG_ON(!new); | |
1461 | ||
3a307ffc MF |
1462 | map_from = cluster_start; |
1463 | map_to = cluster_end; | |
9517bac6 MF |
1464 | |
1465 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, | |
3a307ffc | 1466 | cluster_start, cluster_end, new); |
9517bac6 MF |
1467 | if (ret) { |
1468 | mlog_errno(ret); | |
1469 | goto out; | |
1470 | } | |
1471 | } | |
1472 | ||
1473 | /* | |
1474 | * Parts of newly allocated pages need to be zero'd. | |
1475 | * | |
1476 | * Above, we have also rewritten 'to' and 'from' - as far as | |
1477 | * the rest of the function is concerned, the entire cluster | |
1478 | * range inside of a page needs to be written. | |
1479 | * | |
1480 | * We can skip this if the page is up to date - it's already | |
1481 | * been zero'd from being read in as a hole. | |
1482 | */ | |
1483 | if (new && !PageUptodate(page)) | |
1484 | ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb), | |
3a307ffc | 1485 | cpos, user_data_from, user_data_to); |
9517bac6 MF |
1486 | |
1487 | flush_dcache_page(page); | |
1488 | ||
9517bac6 | 1489 | out: |
3a307ffc | 1490 | return ret; |
9517bac6 MF |
1491 | } |
1492 | ||
1493 | /* | |
3a307ffc | 1494 | * This function will only grab one clusters worth of pages. |
9517bac6 | 1495 | */ |
3a307ffc MF |
1496 | static int ocfs2_grab_pages_for_write(struct address_space *mapping, |
1497 | struct ocfs2_write_ctxt *wc, | |
693c241a JB |
1498 | u32 cpos, loff_t user_pos, |
1499 | unsigned user_len, int new, | |
7307de80 | 1500 | struct page *mmap_page) |
9517bac6 | 1501 | { |
3a307ffc | 1502 | int ret = 0, i; |
693c241a | 1503 | unsigned long start, target_index, end_index, index; |
9517bac6 | 1504 | struct inode *inode = mapping->host; |
693c241a | 1505 | loff_t last_byte; |
9517bac6 | 1506 | |
3a307ffc | 1507 | target_index = user_pos >> PAGE_CACHE_SHIFT; |
9517bac6 MF |
1508 | |
1509 | /* | |
1510 | * Figure out how many pages we'll be manipulating here. For | |
60b11392 | 1511 | * non allocating write, we just change the one |
693c241a JB |
1512 | * page. Otherwise, we'll need a whole clusters worth. If we're |
1513 | * writing past i_size, we only need enough pages to cover the | |
1514 | * last page of the write. | |
9517bac6 | 1515 | */ |
9517bac6 | 1516 | if (new) { |
3a307ffc MF |
1517 | wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb); |
1518 | start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos); | |
693c241a JB |
1519 | /* |
1520 | * We need the index *past* the last page we could possibly | |
1521 | * touch. This is the page past the end of the write or | |
1522 | * i_size, whichever is greater. | |
1523 | */ | |
1524 | last_byte = max(user_pos + user_len, i_size_read(inode)); | |
1525 | BUG_ON(last_byte < 1); | |
1526 | end_index = ((last_byte - 1) >> PAGE_CACHE_SHIFT) + 1; | |
1527 | if ((start + wc->w_num_pages) > end_index) | |
1528 | wc->w_num_pages = end_index - start; | |
9517bac6 | 1529 | } else { |
3a307ffc MF |
1530 | wc->w_num_pages = 1; |
1531 | start = target_index; | |
9517bac6 MF |
1532 | } |
1533 | ||
3a307ffc | 1534 | for(i = 0; i < wc->w_num_pages; i++) { |
9517bac6 MF |
1535 | index = start + i; |
1536 | ||
7307de80 MF |
1537 | if (index == target_index && mmap_page) { |
1538 | /* | |
1539 | * ocfs2_pagemkwrite() is a little different | |
1540 | * and wants us to directly use the page | |
1541 | * passed in. | |
1542 | */ | |
1543 | lock_page(mmap_page); | |
1544 | ||
5cffff9e | 1545 | /* Exit and let the caller retry */ |
7307de80 | 1546 | if (mmap_page->mapping != mapping) { |
5cffff9e | 1547 | WARN_ON(mmap_page->mapping); |
7307de80 | 1548 | unlock_page(mmap_page); |
5cffff9e | 1549 | ret = -EAGAIN; |
7307de80 MF |
1550 | goto out; |
1551 | } | |
1552 | ||
1553 | page_cache_get(mmap_page); | |
1554 | wc->w_pages[i] = mmap_page; | |
5cffff9e | 1555 | wc->w_target_locked = true; |
7307de80 MF |
1556 | } else { |
1557 | wc->w_pages[i] = find_or_create_page(mapping, index, | |
1558 | GFP_NOFS); | |
1559 | if (!wc->w_pages[i]) { | |
1560 | ret = -ENOMEM; | |
1561 | mlog_errno(ret); | |
1562 | goto out; | |
1563 | } | |
9517bac6 | 1564 | } |
1269529b | 1565 | wait_for_stable_page(wc->w_pages[i]); |
3a307ffc MF |
1566 | |
1567 | if (index == target_index) | |
1568 | wc->w_target_page = wc->w_pages[i]; | |
9517bac6 | 1569 | } |
3a307ffc | 1570 | out: |
5cffff9e WW |
1571 | if (ret) |
1572 | wc->w_target_locked = false; | |
3a307ffc MF |
1573 | return ret; |
1574 | } | |
1575 | ||
1576 | /* | |
1577 | * Prepare a single cluster for write one cluster into the file. | |
1578 | */ | |
1579 | static int ocfs2_write_cluster(struct address_space *mapping, | |
b27b7cbc | 1580 | u32 phys, unsigned int unwritten, |
e7432675 | 1581 | unsigned int should_zero, |
b27b7cbc | 1582 | struct ocfs2_alloc_context *data_ac, |
3a307ffc MF |
1583 | struct ocfs2_alloc_context *meta_ac, |
1584 | struct ocfs2_write_ctxt *wc, u32 cpos, | |
1585 | loff_t user_pos, unsigned user_len) | |
1586 | { | |
e7432675 | 1587 | int ret, i, new; |
3a307ffc MF |
1588 | u64 v_blkno, p_blkno; |
1589 | struct inode *inode = mapping->host; | |
f99b9b7c | 1590 | struct ocfs2_extent_tree et; |
3a307ffc MF |
1591 | |
1592 | new = phys == 0 ? 1 : 0; | |
9517bac6 | 1593 | if (new) { |
3a307ffc MF |
1594 | u32 tmp_pos; |
1595 | ||
9517bac6 MF |
1596 | /* |
1597 | * This is safe to call with the page locks - it won't take | |
1598 | * any additional semaphores or cluster locks. | |
1599 | */ | |
3a307ffc | 1600 | tmp_pos = cpos; |
0eb8d47e TM |
1601 | ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode, |
1602 | &tmp_pos, 1, 0, wc->w_di_bh, | |
1603 | wc->w_handle, data_ac, | |
1604 | meta_ac, NULL); | |
9517bac6 MF |
1605 | /* |
1606 | * This shouldn't happen because we must have already | |
1607 | * calculated the correct meta data allocation required. The | |
1608 | * internal tree allocation code should know how to increase | |
1609 | * transaction credits itself. | |
1610 | * | |
1611 | * If need be, we could handle -EAGAIN for a | |
1612 | * RESTART_TRANS here. | |
1613 | */ | |
1614 | mlog_bug_on_msg(ret == -EAGAIN, | |
1615 | "Inode %llu: EAGAIN return during allocation.\n", | |
1616 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1617 | if (ret < 0) { | |
1618 | mlog_errno(ret); | |
1619 | goto out; | |
1620 | } | |
b27b7cbc | 1621 | } else if (unwritten) { |
5e404e9e JB |
1622 | ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), |
1623 | wc->w_di_bh); | |
f99b9b7c | 1624 | ret = ocfs2_mark_extent_written(inode, &et, |
b27b7cbc | 1625 | wc->w_handle, cpos, 1, phys, |
f99b9b7c | 1626 | meta_ac, &wc->w_dealloc); |
b27b7cbc MF |
1627 | if (ret < 0) { |
1628 | mlog_errno(ret); | |
1629 | goto out; | |
1630 | } | |
1631 | } | |
3a307ffc | 1632 | |
b27b7cbc | 1633 | if (should_zero) |
3a307ffc | 1634 | v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, cpos); |
b27b7cbc | 1635 | else |
3a307ffc | 1636 | v_blkno = user_pos >> inode->i_sb->s_blocksize_bits; |
9517bac6 | 1637 | |
3a307ffc MF |
1638 | /* |
1639 | * The only reason this should fail is due to an inability to | |
1640 | * find the extent added. | |
1641 | */ | |
49cb8d2d MF |
1642 | ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL, |
1643 | NULL); | |
9517bac6 | 1644 | if (ret < 0) { |
61fb9ea4 | 1645 | mlog(ML_ERROR, "Get physical blkno failed for inode %llu, " |
3a307ffc MF |
1646 | "at logical block %llu", |
1647 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1648 | (unsigned long long)v_blkno); | |
9517bac6 MF |
1649 | goto out; |
1650 | } | |
1651 | ||
1652 | BUG_ON(p_blkno == 0); | |
1653 | ||
3a307ffc MF |
1654 | for(i = 0; i < wc->w_num_pages; i++) { |
1655 | int tmpret; | |
9517bac6 | 1656 | |
3a307ffc MF |
1657 | tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc, |
1658 | wc->w_pages[i], cpos, | |
b27b7cbc MF |
1659 | user_pos, user_len, |
1660 | should_zero); | |
3a307ffc MF |
1661 | if (tmpret) { |
1662 | mlog_errno(tmpret); | |
1663 | if (ret == 0) | |
cbfa9639 | 1664 | ret = tmpret; |
3a307ffc | 1665 | } |
9517bac6 MF |
1666 | } |
1667 | ||
3a307ffc MF |
1668 | /* |
1669 | * We only have cleanup to do in case of allocating write. | |
1670 | */ | |
1671 | if (ret && new) | |
1672 | ocfs2_write_failure(inode, wc, user_pos, user_len); | |
1673 | ||
9517bac6 | 1674 | out: |
9517bac6 | 1675 | |
3a307ffc | 1676 | return ret; |
9517bac6 MF |
1677 | } |
1678 | ||
0d172baa MF |
1679 | static int ocfs2_write_cluster_by_desc(struct address_space *mapping, |
1680 | struct ocfs2_alloc_context *data_ac, | |
1681 | struct ocfs2_alloc_context *meta_ac, | |
1682 | struct ocfs2_write_ctxt *wc, | |
1683 | loff_t pos, unsigned len) | |
1684 | { | |
1685 | int ret, i; | |
db56246c MF |
1686 | loff_t cluster_off; |
1687 | unsigned int local_len = len; | |
0d172baa | 1688 | struct ocfs2_write_cluster_desc *desc; |
db56246c | 1689 | struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb); |
0d172baa MF |
1690 | |
1691 | for (i = 0; i < wc->w_clen; i++) { | |
1692 | desc = &wc->w_desc[i]; | |
1693 | ||
db56246c MF |
1694 | /* |
1695 | * We have to make sure that the total write passed in | |
1696 | * doesn't extend past a single cluster. | |
1697 | */ | |
1698 | local_len = len; | |
1699 | cluster_off = pos & (osb->s_clustersize - 1); | |
1700 | if ((cluster_off + local_len) > osb->s_clustersize) | |
1701 | local_len = osb->s_clustersize - cluster_off; | |
1702 | ||
b27b7cbc | 1703 | ret = ocfs2_write_cluster(mapping, desc->c_phys, |
e7432675 SM |
1704 | desc->c_unwritten, |
1705 | desc->c_needs_zero, | |
1706 | data_ac, meta_ac, | |
db56246c | 1707 | wc, desc->c_cpos, pos, local_len); |
0d172baa MF |
1708 | if (ret) { |
1709 | mlog_errno(ret); | |
1710 | goto out; | |
1711 | } | |
db56246c MF |
1712 | |
1713 | len -= local_len; | |
1714 | pos += local_len; | |
0d172baa MF |
1715 | } |
1716 | ||
1717 | ret = 0; | |
1718 | out: | |
1719 | return ret; | |
1720 | } | |
1721 | ||
3a307ffc MF |
1722 | /* |
1723 | * ocfs2_write_end() wants to know which parts of the target page it | |
1724 | * should complete the write on. It's easiest to compute them ahead of | |
1725 | * time when a more complete view of the write is available. | |
1726 | */ | |
1727 | static void ocfs2_set_target_boundaries(struct ocfs2_super *osb, | |
1728 | struct ocfs2_write_ctxt *wc, | |
1729 | loff_t pos, unsigned len, int alloc) | |
9517bac6 | 1730 | { |
3a307ffc | 1731 | struct ocfs2_write_cluster_desc *desc; |
9517bac6 | 1732 | |
3a307ffc MF |
1733 | wc->w_target_from = pos & (PAGE_CACHE_SIZE - 1); |
1734 | wc->w_target_to = wc->w_target_from + len; | |
1735 | ||
1736 | if (alloc == 0) | |
1737 | return; | |
1738 | ||
1739 | /* | |
1740 | * Allocating write - we may have different boundaries based | |
1741 | * on page size and cluster size. | |
1742 | * | |
1743 | * NOTE: We can no longer compute one value from the other as | |
1744 | * the actual write length and user provided length may be | |
1745 | * different. | |
1746 | */ | |
9517bac6 | 1747 | |
3a307ffc MF |
1748 | if (wc->w_large_pages) { |
1749 | /* | |
1750 | * We only care about the 1st and last cluster within | |
b27b7cbc | 1751 | * our range and whether they should be zero'd or not. Either |
3a307ffc MF |
1752 | * value may be extended out to the start/end of a |
1753 | * newly allocated cluster. | |
1754 | */ | |
1755 | desc = &wc->w_desc[0]; | |
e7432675 | 1756 | if (desc->c_needs_zero) |
3a307ffc MF |
1757 | ocfs2_figure_cluster_boundaries(osb, |
1758 | desc->c_cpos, | |
1759 | &wc->w_target_from, | |
1760 | NULL); | |
1761 | ||
1762 | desc = &wc->w_desc[wc->w_clen - 1]; | |
e7432675 | 1763 | if (desc->c_needs_zero) |
3a307ffc MF |
1764 | ocfs2_figure_cluster_boundaries(osb, |
1765 | desc->c_cpos, | |
1766 | NULL, | |
1767 | &wc->w_target_to); | |
1768 | } else { | |
1769 | wc->w_target_from = 0; | |
1770 | wc->w_target_to = PAGE_CACHE_SIZE; | |
1771 | } | |
9517bac6 MF |
1772 | } |
1773 | ||
0d172baa MF |
1774 | /* |
1775 | * Populate each single-cluster write descriptor in the write context | |
1776 | * with information about the i/o to be done. | |
b27b7cbc MF |
1777 | * |
1778 | * Returns the number of clusters that will have to be allocated, as | |
1779 | * well as a worst case estimate of the number of extent records that | |
1780 | * would have to be created during a write to an unwritten region. | |
0d172baa MF |
1781 | */ |
1782 | static int ocfs2_populate_write_desc(struct inode *inode, | |
1783 | struct ocfs2_write_ctxt *wc, | |
b27b7cbc MF |
1784 | unsigned int *clusters_to_alloc, |
1785 | unsigned int *extents_to_split) | |
9517bac6 | 1786 | { |
0d172baa | 1787 | int ret; |
3a307ffc | 1788 | struct ocfs2_write_cluster_desc *desc; |
0d172baa | 1789 | unsigned int num_clusters = 0; |
b27b7cbc | 1790 | unsigned int ext_flags = 0; |
0d172baa MF |
1791 | u32 phys = 0; |
1792 | int i; | |
9517bac6 | 1793 | |
b27b7cbc MF |
1794 | *clusters_to_alloc = 0; |
1795 | *extents_to_split = 0; | |
1796 | ||
3a307ffc MF |
1797 | for (i = 0; i < wc->w_clen; i++) { |
1798 | desc = &wc->w_desc[i]; | |
1799 | desc->c_cpos = wc->w_cpos + i; | |
1800 | ||
1801 | if (num_clusters == 0) { | |
b27b7cbc MF |
1802 | /* |
1803 | * Need to look up the next extent record. | |
1804 | */ | |
3a307ffc | 1805 | ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys, |
b27b7cbc | 1806 | &num_clusters, &ext_flags); |
3a307ffc MF |
1807 | if (ret) { |
1808 | mlog_errno(ret); | |
607d44aa | 1809 | goto out; |
3a307ffc | 1810 | } |
b27b7cbc | 1811 | |
293b2f70 TM |
1812 | /* We should already CoW the refcountd extent. */ |
1813 | BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED); | |
1814 | ||
b27b7cbc MF |
1815 | /* |
1816 | * Assume worst case - that we're writing in | |
1817 | * the middle of the extent. | |
1818 | * | |
1819 | * We can assume that the write proceeds from | |
1820 | * left to right, in which case the extent | |
1821 | * insert code is smart enough to coalesce the | |
1822 | * next splits into the previous records created. | |
1823 | */ | |
1824 | if (ext_flags & OCFS2_EXT_UNWRITTEN) | |
1825 | *extents_to_split = *extents_to_split + 2; | |
3a307ffc MF |
1826 | } else if (phys) { |
1827 | /* | |
1828 | * Only increment phys if it doesn't describe | |
1829 | * a hole. | |
1830 | */ | |
1831 | phys++; | |
1832 | } | |
1833 | ||
e7432675 SM |
1834 | /* |
1835 | * If w_first_new_cpos is < UINT_MAX, we have a non-sparse | |
1836 | * file that got extended. w_first_new_cpos tells us | |
1837 | * where the newly allocated clusters are so we can | |
1838 | * zero them. | |
1839 | */ | |
1840 | if (desc->c_cpos >= wc->w_first_new_cpos) { | |
1841 | BUG_ON(phys == 0); | |
1842 | desc->c_needs_zero = 1; | |
1843 | } | |
1844 | ||
3a307ffc MF |
1845 | desc->c_phys = phys; |
1846 | if (phys == 0) { | |
1847 | desc->c_new = 1; | |
e7432675 | 1848 | desc->c_needs_zero = 1; |
0d172baa | 1849 | *clusters_to_alloc = *clusters_to_alloc + 1; |
3a307ffc | 1850 | } |
e7432675 SM |
1851 | |
1852 | if (ext_flags & OCFS2_EXT_UNWRITTEN) { | |
b27b7cbc | 1853 | desc->c_unwritten = 1; |
e7432675 SM |
1854 | desc->c_needs_zero = 1; |
1855 | } | |
3a307ffc MF |
1856 | |
1857 | num_clusters--; | |
9517bac6 MF |
1858 | } |
1859 | ||
0d172baa MF |
1860 | ret = 0; |
1861 | out: | |
1862 | return ret; | |
1863 | } | |
1864 | ||
1afc32b9 MF |
1865 | static int ocfs2_write_begin_inline(struct address_space *mapping, |
1866 | struct inode *inode, | |
1867 | struct ocfs2_write_ctxt *wc) | |
1868 | { | |
1869 | int ret; | |
1870 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1871 | struct page *page; | |
1872 | handle_t *handle; | |
1873 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; | |
1874 | ||
f775da2f JB |
1875 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
1876 | if (IS_ERR(handle)) { | |
1877 | ret = PTR_ERR(handle); | |
1878 | mlog_errno(ret); | |
1879 | goto out; | |
1880 | } | |
1881 | ||
1afc32b9 MF |
1882 | page = find_or_create_page(mapping, 0, GFP_NOFS); |
1883 | if (!page) { | |
f775da2f | 1884 | ocfs2_commit_trans(osb, handle); |
1afc32b9 MF |
1885 | ret = -ENOMEM; |
1886 | mlog_errno(ret); | |
1887 | goto out; | |
1888 | } | |
1889 | /* | |
1890 | * If we don't set w_num_pages then this page won't get unlocked | |
1891 | * and freed on cleanup of the write context. | |
1892 | */ | |
1893 | wc->w_pages[0] = wc->w_target_page = page; | |
1894 | wc->w_num_pages = 1; | |
1895 | ||
0cf2f763 | 1896 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh, |
13723d00 | 1897 | OCFS2_JOURNAL_ACCESS_WRITE); |
1afc32b9 MF |
1898 | if (ret) { |
1899 | ocfs2_commit_trans(osb, handle); | |
1900 | ||
1901 | mlog_errno(ret); | |
1902 | goto out; | |
1903 | } | |
1904 | ||
1905 | if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) | |
1906 | ocfs2_set_inode_data_inline(inode, di); | |
1907 | ||
1908 | if (!PageUptodate(page)) { | |
1909 | ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh); | |
1910 | if (ret) { | |
1911 | ocfs2_commit_trans(osb, handle); | |
1912 | ||
1913 | goto out; | |
1914 | } | |
1915 | } | |
1916 | ||
1917 | wc->w_handle = handle; | |
1918 | out: | |
1919 | return ret; | |
1920 | } | |
1921 | ||
1922 | int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size) | |
1923 | { | |
1924 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; | |
1925 | ||
0d8a4e0c | 1926 | if (new_size <= le16_to_cpu(di->id2.i_data.id_count)) |
1afc32b9 MF |
1927 | return 1; |
1928 | return 0; | |
1929 | } | |
1930 | ||
1931 | static int ocfs2_try_to_write_inline_data(struct address_space *mapping, | |
1932 | struct inode *inode, loff_t pos, | |
1933 | unsigned len, struct page *mmap_page, | |
1934 | struct ocfs2_write_ctxt *wc) | |
1935 | { | |
1936 | int ret, written = 0; | |
1937 | loff_t end = pos + len; | |
1938 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
d9ae49d6 | 1939 | struct ocfs2_dinode *di = NULL; |
1afc32b9 | 1940 | |
9558156b TM |
1941 | trace_ocfs2_try_to_write_inline_data((unsigned long long)oi->ip_blkno, |
1942 | len, (unsigned long long)pos, | |
1943 | oi->ip_dyn_features); | |
1afc32b9 MF |
1944 | |
1945 | /* | |
1946 | * Handle inodes which already have inline data 1st. | |
1947 | */ | |
1948 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { | |
1949 | if (mmap_page == NULL && | |
1950 | ocfs2_size_fits_inline_data(wc->w_di_bh, end)) | |
1951 | goto do_inline_write; | |
1952 | ||
1953 | /* | |
1954 | * The write won't fit - we have to give this inode an | |
1955 | * inline extent list now. | |
1956 | */ | |
1957 | ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh); | |
1958 | if (ret) | |
1959 | mlog_errno(ret); | |
1960 | goto out; | |
1961 | } | |
1962 | ||
1963 | /* | |
1964 | * Check whether the inode can accept inline data. | |
1965 | */ | |
1966 | if (oi->ip_clusters != 0 || i_size_read(inode) != 0) | |
1967 | return 0; | |
1968 | ||
1969 | /* | |
1970 | * Check whether the write can fit. | |
1971 | */ | |
d9ae49d6 TY |
1972 | di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; |
1973 | if (mmap_page || | |
1974 | end > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) | |
1afc32b9 MF |
1975 | return 0; |
1976 | ||
1977 | do_inline_write: | |
1978 | ret = ocfs2_write_begin_inline(mapping, inode, wc); | |
1979 | if (ret) { | |
1980 | mlog_errno(ret); | |
1981 | goto out; | |
1982 | } | |
1983 | ||
1984 | /* | |
1985 | * This signals to the caller that the data can be written | |
1986 | * inline. | |
1987 | */ | |
1988 | written = 1; | |
1989 | out: | |
1990 | return written ? written : ret; | |
1991 | } | |
1992 | ||
65ed39d6 MF |
1993 | /* |
1994 | * This function only does anything for file systems which can't | |
1995 | * handle sparse files. | |
1996 | * | |
1997 | * What we want to do here is fill in any hole between the current end | |
1998 | * of allocation and the end of our write. That way the rest of the | |
1999 | * write path can treat it as an non-allocating write, which has no | |
2000 | * special case code for sparse/nonsparse files. | |
2001 | */ | |
5693486b JB |
2002 | static int ocfs2_expand_nonsparse_inode(struct inode *inode, |
2003 | struct buffer_head *di_bh, | |
2004 | loff_t pos, unsigned len, | |
65ed39d6 MF |
2005 | struct ocfs2_write_ctxt *wc) |
2006 | { | |
2007 | int ret; | |
65ed39d6 MF |
2008 | loff_t newsize = pos + len; |
2009 | ||
5693486b | 2010 | BUG_ON(ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))); |
65ed39d6 MF |
2011 | |
2012 | if (newsize <= i_size_read(inode)) | |
2013 | return 0; | |
2014 | ||
5693486b | 2015 | ret = ocfs2_extend_no_holes(inode, di_bh, newsize, pos); |
65ed39d6 MF |
2016 | if (ret) |
2017 | mlog_errno(ret); | |
2018 | ||
e7432675 SM |
2019 | wc->w_first_new_cpos = |
2020 | ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode)); | |
2021 | ||
65ed39d6 MF |
2022 | return ret; |
2023 | } | |
2024 | ||
5693486b JB |
2025 | static int ocfs2_zero_tail(struct inode *inode, struct buffer_head *di_bh, |
2026 | loff_t pos) | |
2027 | { | |
2028 | int ret = 0; | |
2029 | ||
2030 | BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))); | |
2031 | if (pos > i_size_read(inode)) | |
2032 | ret = ocfs2_zero_extend(inode, di_bh, pos); | |
2033 | ||
2034 | return ret; | |
2035 | } | |
2036 | ||
50308d81 TM |
2037 | /* |
2038 | * Try to flush truncate logs if we can free enough clusters from it. | |
2039 | * As for return value, "< 0" means error, "0" no space and "1" means | |
2040 | * we have freed enough spaces and let the caller try to allocate again. | |
2041 | */ | |
2042 | static int ocfs2_try_to_free_truncate_log(struct ocfs2_super *osb, | |
2043 | unsigned int needed) | |
2044 | { | |
2045 | tid_t target; | |
2046 | int ret = 0; | |
2047 | unsigned int truncated_clusters; | |
2048 | ||
5955102c | 2049 | inode_lock(osb->osb_tl_inode); |
50308d81 | 2050 | truncated_clusters = osb->truncated_clusters; |
5955102c | 2051 | inode_unlock(osb->osb_tl_inode); |
50308d81 TM |
2052 | |
2053 | /* | |
2054 | * Check whether we can succeed in allocating if we free | |
2055 | * the truncate log. | |
2056 | */ | |
2057 | if (truncated_clusters < needed) | |
2058 | goto out; | |
2059 | ||
2060 | ret = ocfs2_flush_truncate_log(osb); | |
2061 | if (ret) { | |
2062 | mlog_errno(ret); | |
2063 | goto out; | |
2064 | } | |
2065 | ||
2066 | if (jbd2_journal_start_commit(osb->journal->j_journal, &target)) { | |
2067 | jbd2_log_wait_commit(osb->journal->j_journal, target); | |
2068 | ret = 1; | |
2069 | } | |
2070 | out: | |
2071 | return ret; | |
2072 | } | |
2073 | ||
0378da0f TM |
2074 | int ocfs2_write_begin_nolock(struct file *filp, |
2075 | struct address_space *mapping, | |
0d172baa MF |
2076 | loff_t pos, unsigned len, unsigned flags, |
2077 | struct page **pagep, void **fsdata, | |
2078 | struct buffer_head *di_bh, struct page *mmap_page) | |
2079 | { | |
e7432675 | 2080 | int ret, cluster_of_pages, credits = OCFS2_INODE_UPDATE_CREDITS; |
50308d81 | 2081 | unsigned int clusters_to_alloc, extents_to_split, clusters_need = 0; |
0d172baa MF |
2082 | struct ocfs2_write_ctxt *wc; |
2083 | struct inode *inode = mapping->host; | |
2084 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
2085 | struct ocfs2_dinode *di; | |
2086 | struct ocfs2_alloc_context *data_ac = NULL; | |
2087 | struct ocfs2_alloc_context *meta_ac = NULL; | |
2088 | handle_t *handle; | |
f99b9b7c | 2089 | struct ocfs2_extent_tree et; |
50308d81 | 2090 | int try_free = 1, ret1; |
0d172baa | 2091 | |
50308d81 | 2092 | try_again: |
0d172baa MF |
2093 | ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh); |
2094 | if (ret) { | |
2095 | mlog_errno(ret); | |
2096 | return ret; | |
2097 | } | |
2098 | ||
1afc32b9 MF |
2099 | if (ocfs2_supports_inline_data(osb)) { |
2100 | ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len, | |
2101 | mmap_page, wc); | |
2102 | if (ret == 1) { | |
2103 | ret = 0; | |
2104 | goto success; | |
2105 | } | |
2106 | if (ret < 0) { | |
2107 | mlog_errno(ret); | |
2108 | goto out; | |
2109 | } | |
2110 | } | |
2111 | ||
5693486b JB |
2112 | if (ocfs2_sparse_alloc(osb)) |
2113 | ret = ocfs2_zero_tail(inode, di_bh, pos); | |
2114 | else | |
2115 | ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos, len, | |
2116 | wc); | |
65ed39d6 MF |
2117 | if (ret) { |
2118 | mlog_errno(ret); | |
2119 | goto out; | |
2120 | } | |
2121 | ||
293b2f70 TM |
2122 | ret = ocfs2_check_range_for_refcount(inode, pos, len); |
2123 | if (ret < 0) { | |
2124 | mlog_errno(ret); | |
2125 | goto out; | |
2126 | } else if (ret == 1) { | |
50308d81 | 2127 | clusters_need = wc->w_clen; |
c7dd3392 | 2128 | ret = ocfs2_refcount_cow(inode, di_bh, |
37f8a2bf | 2129 | wc->w_cpos, wc->w_clen, UINT_MAX); |
293b2f70 TM |
2130 | if (ret) { |
2131 | mlog_errno(ret); | |
2132 | goto out; | |
2133 | } | |
2134 | } | |
2135 | ||
b27b7cbc MF |
2136 | ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc, |
2137 | &extents_to_split); | |
0d172baa MF |
2138 | if (ret) { |
2139 | mlog_errno(ret); | |
2140 | goto out; | |
2141 | } | |
50308d81 | 2142 | clusters_need += clusters_to_alloc; |
0d172baa MF |
2143 | |
2144 | di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; | |
2145 | ||
9558156b TM |
2146 | trace_ocfs2_write_begin_nolock( |
2147 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
2148 | (long long)i_size_read(inode), | |
2149 | le32_to_cpu(di->i_clusters), | |
2150 | pos, len, flags, mmap_page, | |
2151 | clusters_to_alloc, extents_to_split); | |
2152 | ||
3a307ffc MF |
2153 | /* |
2154 | * We set w_target_from, w_target_to here so that | |
2155 | * ocfs2_write_end() knows which range in the target page to | |
2156 | * write out. An allocation requires that we write the entire | |
2157 | * cluster range. | |
2158 | */ | |
b27b7cbc | 2159 | if (clusters_to_alloc || extents_to_split) { |
3a307ffc MF |
2160 | /* |
2161 | * XXX: We are stretching the limits of | |
b27b7cbc | 2162 | * ocfs2_lock_allocators(). It greatly over-estimates |
3a307ffc MF |
2163 | * the work to be done. |
2164 | */ | |
5e404e9e JB |
2165 | ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), |
2166 | wc->w_di_bh); | |
f99b9b7c | 2167 | ret = ocfs2_lock_allocators(inode, &et, |
231b87d1 | 2168 | clusters_to_alloc, extents_to_split, |
f99b9b7c | 2169 | &data_ac, &meta_ac); |
9517bac6 MF |
2170 | if (ret) { |
2171 | mlog_errno(ret); | |
607d44aa | 2172 | goto out; |
9517bac6 MF |
2173 | } |
2174 | ||
4fe370af MF |
2175 | if (data_ac) |
2176 | data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv; | |
2177 | ||
811f933d | 2178 | credits = ocfs2_calc_extend_credits(inode->i_sb, |
06f9da6e | 2179 | &di->id2.i_list); |
3a307ffc | 2180 | |
9517bac6 MF |
2181 | } |
2182 | ||
e7432675 SM |
2183 | /* |
2184 | * We have to zero sparse allocated clusters, unwritten extent clusters, | |
2185 | * and non-sparse clusters we just extended. For non-sparse writes, | |
2186 | * we know zeros will only be needed in the first and/or last cluster. | |
2187 | */ | |
2188 | if (clusters_to_alloc || extents_to_split || | |
8379e7c4 SM |
2189 | (wc->w_clen && (wc->w_desc[0].c_needs_zero || |
2190 | wc->w_desc[wc->w_clen - 1].c_needs_zero))) | |
e7432675 SM |
2191 | cluster_of_pages = 1; |
2192 | else | |
2193 | cluster_of_pages = 0; | |
2194 | ||
2195 | ocfs2_set_target_boundaries(osb, wc, pos, len, cluster_of_pages); | |
3a307ffc | 2196 | |
9517bac6 MF |
2197 | handle = ocfs2_start_trans(osb, credits); |
2198 | if (IS_ERR(handle)) { | |
2199 | ret = PTR_ERR(handle); | |
2200 | mlog_errno(ret); | |
607d44aa | 2201 | goto out; |
9517bac6 MF |
2202 | } |
2203 | ||
3a307ffc MF |
2204 | wc->w_handle = handle; |
2205 | ||
5dd4056d CH |
2206 | if (clusters_to_alloc) { |
2207 | ret = dquot_alloc_space_nodirty(inode, | |
2208 | ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc)); | |
2209 | if (ret) | |
2210 | goto out_commit; | |
a90714c1 | 2211 | } |
7f27ec97 | 2212 | |
0cf2f763 | 2213 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh, |
13723d00 | 2214 | OCFS2_JOURNAL_ACCESS_WRITE); |
3a307ffc | 2215 | if (ret) { |
9517bac6 | 2216 | mlog_errno(ret); |
a90714c1 | 2217 | goto out_quota; |
9517bac6 MF |
2218 | } |
2219 | ||
3a307ffc MF |
2220 | /* |
2221 | * Fill our page array first. That way we've grabbed enough so | |
2222 | * that we can zero and flush if we error after adding the | |
2223 | * extent. | |
2224 | */ | |
693c241a | 2225 | ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, len, |
e7432675 | 2226 | cluster_of_pages, mmap_page); |
5cffff9e | 2227 | if (ret && ret != -EAGAIN) { |
9517bac6 | 2228 | mlog_errno(ret); |
a90714c1 | 2229 | goto out_quota; |
9517bac6 MF |
2230 | } |
2231 | ||
5cffff9e WW |
2232 | /* |
2233 | * ocfs2_grab_pages_for_write() returns -EAGAIN if it could not lock | |
2234 | * the target page. In this case, we exit with no error and no target | |
2235 | * page. This will trigger the caller, page_mkwrite(), to re-try | |
2236 | * the operation. | |
2237 | */ | |
2238 | if (ret == -EAGAIN) { | |
2239 | BUG_ON(wc->w_target_page); | |
2240 | ret = 0; | |
2241 | goto out_quota; | |
2242 | } | |
2243 | ||
0d172baa MF |
2244 | ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos, |
2245 | len); | |
2246 | if (ret) { | |
2247 | mlog_errno(ret); | |
a90714c1 | 2248 | goto out_quota; |
9517bac6 | 2249 | } |
9517bac6 | 2250 | |
3a307ffc MF |
2251 | if (data_ac) |
2252 | ocfs2_free_alloc_context(data_ac); | |
2253 | if (meta_ac) | |
2254 | ocfs2_free_alloc_context(meta_ac); | |
9517bac6 | 2255 | |
1afc32b9 | 2256 | success: |
3a307ffc MF |
2257 | *pagep = wc->w_target_page; |
2258 | *fsdata = wc; | |
2259 | return 0; | |
a90714c1 JK |
2260 | out_quota: |
2261 | if (clusters_to_alloc) | |
5dd4056d | 2262 | dquot_free_space(inode, |
a90714c1 | 2263 | ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc)); |
9517bac6 MF |
2264 | out_commit: |
2265 | ocfs2_commit_trans(osb, handle); | |
2266 | ||
9517bac6 | 2267 | out: |
3a307ffc MF |
2268 | ocfs2_free_write_ctxt(wc); |
2269 | ||
b1214e47 | 2270 | if (data_ac) { |
9517bac6 | 2271 | ocfs2_free_alloc_context(data_ac); |
b1214e47 X |
2272 | data_ac = NULL; |
2273 | } | |
2274 | if (meta_ac) { | |
9517bac6 | 2275 | ocfs2_free_alloc_context(meta_ac); |
b1214e47 X |
2276 | meta_ac = NULL; |
2277 | } | |
50308d81 TM |
2278 | |
2279 | if (ret == -ENOSPC && try_free) { | |
2280 | /* | |
2281 | * Try to free some truncate log so that we can have enough | |
2282 | * clusters to allocate. | |
2283 | */ | |
2284 | try_free = 0; | |
2285 | ||
2286 | ret1 = ocfs2_try_to_free_truncate_log(osb, clusters_need); | |
2287 | if (ret1 == 1) | |
2288 | goto try_again; | |
2289 | ||
2290 | if (ret1 < 0) | |
2291 | mlog_errno(ret1); | |
2292 | } | |
2293 | ||
3a307ffc MF |
2294 | return ret; |
2295 | } | |
2296 | ||
b6af1bcd NP |
2297 | static int ocfs2_write_begin(struct file *file, struct address_space *mapping, |
2298 | loff_t pos, unsigned len, unsigned flags, | |
2299 | struct page **pagep, void **fsdata) | |
607d44aa MF |
2300 | { |
2301 | int ret; | |
2302 | struct buffer_head *di_bh = NULL; | |
2303 | struct inode *inode = mapping->host; | |
2304 | ||
e63aecb6 | 2305 | ret = ocfs2_inode_lock(inode, &di_bh, 1); |
607d44aa MF |
2306 | if (ret) { |
2307 | mlog_errno(ret); | |
2308 | return ret; | |
2309 | } | |
2310 | ||
2311 | /* | |
2312 | * Take alloc sem here to prevent concurrent lookups. That way | |
2313 | * the mapping, zeroing and tree manipulation within | |
2314 | * ocfs2_write() will be safe against ->readpage(). This | |
2315 | * should also serve to lock out allocation from a shared | |
2316 | * writeable region. | |
2317 | */ | |
2318 | down_write(&OCFS2_I(inode)->ip_alloc_sem); | |
2319 | ||
0378da0f | 2320 | ret = ocfs2_write_begin_nolock(file, mapping, pos, len, flags, pagep, |
7307de80 | 2321 | fsdata, di_bh, NULL); |
607d44aa MF |
2322 | if (ret) { |
2323 | mlog_errno(ret); | |
c934a92d | 2324 | goto out_fail; |
607d44aa MF |
2325 | } |
2326 | ||
2327 | brelse(di_bh); | |
2328 | ||
2329 | return 0; | |
2330 | ||
607d44aa MF |
2331 | out_fail: |
2332 | up_write(&OCFS2_I(inode)->ip_alloc_sem); | |
2333 | ||
2334 | brelse(di_bh); | |
e63aecb6 | 2335 | ocfs2_inode_unlock(inode, 1); |
607d44aa MF |
2336 | |
2337 | return ret; | |
2338 | } | |
2339 | ||
1afc32b9 MF |
2340 | static void ocfs2_write_end_inline(struct inode *inode, loff_t pos, |
2341 | unsigned len, unsigned *copied, | |
2342 | struct ocfs2_dinode *di, | |
2343 | struct ocfs2_write_ctxt *wc) | |
2344 | { | |
2345 | void *kaddr; | |
2346 | ||
2347 | if (unlikely(*copied < len)) { | |
2348 | if (!PageUptodate(wc->w_target_page)) { | |
2349 | *copied = 0; | |
2350 | return; | |
2351 | } | |
2352 | } | |
2353 | ||
c4bc8dcb | 2354 | kaddr = kmap_atomic(wc->w_target_page); |
1afc32b9 | 2355 | memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied); |
c4bc8dcb | 2356 | kunmap_atomic(kaddr); |
1afc32b9 | 2357 | |
9558156b TM |
2358 | trace_ocfs2_write_end_inline( |
2359 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1afc32b9 MF |
2360 | (unsigned long long)pos, *copied, |
2361 | le16_to_cpu(di->id2.i_data.id_count), | |
2362 | le16_to_cpu(di->i_dyn_features)); | |
2363 | } | |
2364 | ||
7307de80 MF |
2365 | int ocfs2_write_end_nolock(struct address_space *mapping, |
2366 | loff_t pos, unsigned len, unsigned copied, | |
2367 | struct page *page, void *fsdata) | |
3a307ffc | 2368 | { |
7f27ec97 | 2369 | int i, ret; |
3a307ffc MF |
2370 | unsigned from, to, start = pos & (PAGE_CACHE_SIZE - 1); |
2371 | struct inode *inode = mapping->host; | |
2372 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
2373 | struct ocfs2_write_ctxt *wc = fsdata; | |
2374 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; | |
2375 | handle_t *handle = wc->w_handle; | |
2376 | struct page *tmppage; | |
2377 | ||
7f27ec97 | 2378 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh, |
2379 | OCFS2_JOURNAL_ACCESS_WRITE); | |
2380 | if (ret) { | |
2381 | copied = ret; | |
2382 | mlog_errno(ret); | |
2383 | goto out; | |
2384 | } | |
2385 | ||
1afc32b9 MF |
2386 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
2387 | ocfs2_write_end_inline(inode, pos, len, &copied, di, wc); | |
2388 | goto out_write_size; | |
2389 | } | |
2390 | ||
3a307ffc MF |
2391 | if (unlikely(copied < len)) { |
2392 | if (!PageUptodate(wc->w_target_page)) | |
2393 | copied = 0; | |
2394 | ||
2395 | ocfs2_zero_new_buffers(wc->w_target_page, start+copied, | |
2396 | start+len); | |
2397 | } | |
2398 | flush_dcache_page(wc->w_target_page); | |
2399 | ||
2400 | for(i = 0; i < wc->w_num_pages; i++) { | |
2401 | tmppage = wc->w_pages[i]; | |
2402 | ||
2403 | if (tmppage == wc->w_target_page) { | |
2404 | from = wc->w_target_from; | |
2405 | to = wc->w_target_to; | |
2406 | ||
2407 | BUG_ON(from > PAGE_CACHE_SIZE || | |
2408 | to > PAGE_CACHE_SIZE || | |
2409 | to < from); | |
2410 | } else { | |
2411 | /* | |
2412 | * Pages adjacent to the target (if any) imply | |
2413 | * a hole-filling write in which case we want | |
2414 | * to flush their entire range. | |
2415 | */ | |
2416 | from = 0; | |
2417 | to = PAGE_CACHE_SIZE; | |
2418 | } | |
2419 | ||
961cecbe | 2420 | if (page_has_buffers(tmppage)) { |
53ef99ca | 2421 | if (ocfs2_should_order_data(inode)) |
2b4e30fb | 2422 | ocfs2_jbd2_file_inode(wc->w_handle, inode); |
961cecbe SM |
2423 | block_commit_write(tmppage, from, to); |
2424 | } | |
3a307ffc MF |
2425 | } |
2426 | ||
1afc32b9 | 2427 | out_write_size: |
3a307ffc | 2428 | pos += copied; |
f17c20dd | 2429 | if (pos > i_size_read(inode)) { |
3a307ffc MF |
2430 | i_size_write(inode, pos); |
2431 | mark_inode_dirty(inode); | |
2432 | } | |
2433 | inode->i_blocks = ocfs2_inode_sector_count(inode); | |
2434 | di->i_size = cpu_to_le64((u64)i_size_read(inode)); | |
2435 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
2436 | di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec); | |
2437 | di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); | |
2931cdcb | 2438 | ocfs2_update_inode_fsync_trans(handle, inode, 1); |
3a307ffc MF |
2439 | ocfs2_journal_dirty(handle, wc->w_di_bh); |
2440 | ||
7f27ec97 | 2441 | out: |
136f49b9 JB |
2442 | /* unlock pages before dealloc since it needs acquiring j_trans_barrier |
2443 | * lock, or it will cause a deadlock since journal commit threads holds | |
2444 | * this lock and will ask for the page lock when flushing the data. | |
2445 | * put it here to preserve the unlock order. | |
2446 | */ | |
2447 | ocfs2_unlock_pages(wc); | |
2448 | ||
3a307ffc | 2449 | ocfs2_commit_trans(osb, handle); |
59a5e416 | 2450 | |
b27b7cbc MF |
2451 | ocfs2_run_deallocs(osb, &wc->w_dealloc); |
2452 | ||
136f49b9 JB |
2453 | brelse(wc->w_di_bh); |
2454 | kfree(wc); | |
607d44aa MF |
2455 | |
2456 | return copied; | |
2457 | } | |
2458 | ||
b6af1bcd NP |
2459 | static int ocfs2_write_end(struct file *file, struct address_space *mapping, |
2460 | loff_t pos, unsigned len, unsigned copied, | |
2461 | struct page *page, void *fsdata) | |
607d44aa MF |
2462 | { |
2463 | int ret; | |
2464 | struct inode *inode = mapping->host; | |
2465 | ||
2466 | ret = ocfs2_write_end_nolock(mapping, pos, len, copied, page, fsdata); | |
2467 | ||
3a307ffc | 2468 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
e63aecb6 | 2469 | ocfs2_inode_unlock(inode, 1); |
9517bac6 | 2470 | |
607d44aa | 2471 | return ret; |
9517bac6 MF |
2472 | } |
2473 | ||
f5e54d6e | 2474 | const struct address_space_operations ocfs2_aops = { |
1fca3a05 HH |
2475 | .readpage = ocfs2_readpage, |
2476 | .readpages = ocfs2_readpages, | |
2477 | .writepage = ocfs2_writepage, | |
2478 | .write_begin = ocfs2_write_begin, | |
2479 | .write_end = ocfs2_write_end, | |
2480 | .bmap = ocfs2_bmap, | |
1fca3a05 | 2481 | .direct_IO = ocfs2_direct_IO, |
41ecc345 | 2482 | .invalidatepage = block_invalidatepage, |
1fca3a05 HH |
2483 | .releasepage = ocfs2_releasepage, |
2484 | .migratepage = buffer_migrate_page, | |
2485 | .is_partially_uptodate = block_is_partially_uptodate, | |
aa261f54 | 2486 | .error_remove_page = generic_error_remove_page, |
ccd979bd | 2487 | }; |