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328970de | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
ccd979bd MF |
2 | /* -*- mode: c; c-basic-offset: 8; -*- |
3 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
4 | * | |
5 | * Copyright (C) 2002, 2004 Oracle. All rights reserved. | |
ccd979bd MF |
6 | */ |
7 | ||
8 | #include <linux/fs.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/highmem.h> | |
11 | #include <linux/pagemap.h> | |
12 | #include <asm/byteorder.h> | |
9517bac6 | 13 | #include <linux/swap.h> |
628a24f5 | 14 | #include <linux/mpage.h> |
a90714c1 | 15 | #include <linux/quotaops.h> |
24c40b32 | 16 | #include <linux/blkdev.h> |
e2e40f2c | 17 | #include <linux/uio.h> |
f86196ea | 18 | #include <linux/mm.h> |
ccd979bd | 19 | |
ccd979bd MF |
20 | #include <cluster/masklog.h> |
21 | ||
22 | #include "ocfs2.h" | |
23 | ||
24 | #include "alloc.h" | |
25 | #include "aops.h" | |
26 | #include "dlmglue.h" | |
27 | #include "extent_map.h" | |
28 | #include "file.h" | |
29 | #include "inode.h" | |
30 | #include "journal.h" | |
9517bac6 | 31 | #include "suballoc.h" |
ccd979bd MF |
32 | #include "super.h" |
33 | #include "symlink.h" | |
293b2f70 | 34 | #include "refcounttree.h" |
9558156b | 35 | #include "ocfs2_trace.h" |
ccd979bd MF |
36 | |
37 | #include "buffer_head_io.h" | |
24c40b32 JQ |
38 | #include "dir.h" |
39 | #include "namei.h" | |
40 | #include "sysfile.h" | |
ccd979bd MF |
41 | |
42 | static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock, | |
43 | struct buffer_head *bh_result, int create) | |
44 | { | |
45 | int err = -EIO; | |
46 | int status; | |
47 | struct ocfs2_dinode *fe = NULL; | |
48 | struct buffer_head *bh = NULL; | |
49 | struct buffer_head *buffer_cache_bh = NULL; | |
50 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
51 | void *kaddr; | |
52 | ||
9558156b TM |
53 | trace_ocfs2_symlink_get_block( |
54 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
55 | (unsigned long long)iblock, bh_result, create); | |
ccd979bd MF |
56 | |
57 | BUG_ON(ocfs2_inode_is_fast_symlink(inode)); | |
58 | ||
59 | if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) { | |
60 | mlog(ML_ERROR, "block offset > PATH_MAX: %llu", | |
61 | (unsigned long long)iblock); | |
62 | goto bail; | |
63 | } | |
64 | ||
b657c95c | 65 | status = ocfs2_read_inode_block(inode, &bh); |
ccd979bd MF |
66 | if (status < 0) { |
67 | mlog_errno(status); | |
68 | goto bail; | |
69 | } | |
70 | fe = (struct ocfs2_dinode *) bh->b_data; | |
71 | ||
ccd979bd MF |
72 | if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb, |
73 | le32_to_cpu(fe->i_clusters))) { | |
7391a294 | 74 | err = -ENOMEM; |
ccd979bd MF |
75 | mlog(ML_ERROR, "block offset is outside the allocated size: " |
76 | "%llu\n", (unsigned long long)iblock); | |
77 | goto bail; | |
78 | } | |
79 | ||
80 | /* We don't use the page cache to create symlink data, so if | |
81 | * need be, copy it over from the buffer cache. */ | |
82 | if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) { | |
83 | u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + | |
84 | iblock; | |
85 | buffer_cache_bh = sb_getblk(osb->sb, blkno); | |
86 | if (!buffer_cache_bh) { | |
7391a294 | 87 | err = -ENOMEM; |
ccd979bd MF |
88 | mlog(ML_ERROR, "couldn't getblock for symlink!\n"); |
89 | goto bail; | |
90 | } | |
91 | ||
92 | /* we haven't locked out transactions, so a commit | |
93 | * could've happened. Since we've got a reference on | |
94 | * the bh, even if it commits while we're doing the | |
95 | * copy, the data is still good. */ | |
96 | if (buffer_jbd(buffer_cache_bh) | |
97 | && ocfs2_inode_is_new(inode)) { | |
c4bc8dcb | 98 | kaddr = kmap_atomic(bh_result->b_page); |
ccd979bd MF |
99 | if (!kaddr) { |
100 | mlog(ML_ERROR, "couldn't kmap!\n"); | |
101 | goto bail; | |
102 | } | |
103 | memcpy(kaddr + (bh_result->b_size * iblock), | |
104 | buffer_cache_bh->b_data, | |
105 | bh_result->b_size); | |
c4bc8dcb | 106 | kunmap_atomic(kaddr); |
ccd979bd MF |
107 | set_buffer_uptodate(bh_result); |
108 | } | |
109 | brelse(buffer_cache_bh); | |
110 | } | |
111 | ||
112 | map_bh(bh_result, inode->i_sb, | |
113 | le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock); | |
114 | ||
115 | err = 0; | |
116 | ||
117 | bail: | |
a81cb88b | 118 | brelse(bh); |
ccd979bd | 119 | |
ccd979bd MF |
120 | return err; |
121 | } | |
122 | ||
3e4c56d4 | 123 | static int ocfs2_lock_get_block(struct inode *inode, sector_t iblock, |
124 | struct buffer_head *bh_result, int create) | |
125 | { | |
126 | int ret = 0; | |
127 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
128 | ||
129 | down_read(&oi->ip_alloc_sem); | |
130 | ret = ocfs2_get_block(inode, iblock, bh_result, create); | |
131 | up_read(&oi->ip_alloc_sem); | |
132 | ||
133 | return ret; | |
134 | } | |
135 | ||
6f70fa51 TM |
136 | int ocfs2_get_block(struct inode *inode, sector_t iblock, |
137 | struct buffer_head *bh_result, int create) | |
ccd979bd MF |
138 | { |
139 | int err = 0; | |
49cb8d2d | 140 | unsigned int ext_flags; |
628a24f5 MF |
141 | u64 max_blocks = bh_result->b_size >> inode->i_blkbits; |
142 | u64 p_blkno, count, past_eof; | |
25baf2da | 143 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 144 | |
9558156b TM |
145 | trace_ocfs2_get_block((unsigned long long)OCFS2_I(inode)->ip_blkno, |
146 | (unsigned long long)iblock, bh_result, create); | |
ccd979bd MF |
147 | |
148 | if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) | |
149 | mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n", | |
150 | inode, inode->i_ino); | |
151 | ||
152 | if (S_ISLNK(inode->i_mode)) { | |
153 | /* this always does I/O for some reason. */ | |
154 | err = ocfs2_symlink_get_block(inode, iblock, bh_result, create); | |
155 | goto bail; | |
156 | } | |
157 | ||
628a24f5 | 158 | err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &count, |
49cb8d2d | 159 | &ext_flags); |
ccd979bd MF |
160 | if (err) { |
161 | mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, " | |
b0697053 MF |
162 | "%llu, NULL)\n", err, inode, (unsigned long long)iblock, |
163 | (unsigned long long)p_blkno); | |
ccd979bd MF |
164 | goto bail; |
165 | } | |
166 | ||
628a24f5 MF |
167 | if (max_blocks < count) |
168 | count = max_blocks; | |
169 | ||
25baf2da MF |
170 | /* |
171 | * ocfs2 never allocates in this function - the only time we | |
172 | * need to use BH_New is when we're extending i_size on a file | |
173 | * system which doesn't support holes, in which case BH_New | |
ebdec241 | 174 | * allows __block_write_begin() to zero. |
c0420ad2 CL |
175 | * |
176 | * If we see this on a sparse file system, then a truncate has | |
177 | * raced us and removed the cluster. In this case, we clear | |
178 | * the buffers dirty and uptodate bits and let the buffer code | |
179 | * ignore it as a hole. | |
25baf2da | 180 | */ |
c0420ad2 CL |
181 | if (create && p_blkno == 0 && ocfs2_sparse_alloc(osb)) { |
182 | clear_buffer_dirty(bh_result); | |
183 | clear_buffer_uptodate(bh_result); | |
184 | goto bail; | |
185 | } | |
25baf2da | 186 | |
49cb8d2d MF |
187 | /* Treat the unwritten extent as a hole for zeroing purposes. */ |
188 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) | |
25baf2da MF |
189 | map_bh(bh_result, inode->i_sb, p_blkno); |
190 | ||
628a24f5 MF |
191 | bh_result->b_size = count << inode->i_blkbits; |
192 | ||
25baf2da MF |
193 | if (!ocfs2_sparse_alloc(osb)) { |
194 | if (p_blkno == 0) { | |
195 | err = -EIO; | |
196 | mlog(ML_ERROR, | |
197 | "iblock = %llu p_blkno = %llu blkno=(%llu)\n", | |
198 | (unsigned long long)iblock, | |
199 | (unsigned long long)p_blkno, | |
200 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
201 | mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters); | |
202 | dump_stack(); | |
1f4cea37 | 203 | goto bail; |
25baf2da | 204 | } |
25baf2da | 205 | } |
ccd979bd | 206 | |
5693486b | 207 | past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); |
9558156b TM |
208 | |
209 | trace_ocfs2_get_block_end((unsigned long long)OCFS2_I(inode)->ip_blkno, | |
210 | (unsigned long long)past_eof); | |
5693486b JB |
211 | if (create && (iblock >= past_eof)) |
212 | set_buffer_new(bh_result); | |
213 | ||
ccd979bd MF |
214 | bail: |
215 | if (err < 0) | |
216 | err = -EIO; | |
217 | ||
ccd979bd MF |
218 | return err; |
219 | } | |
220 | ||
1afc32b9 MF |
221 | int ocfs2_read_inline_data(struct inode *inode, struct page *page, |
222 | struct buffer_head *di_bh) | |
6798d35a MF |
223 | { |
224 | void *kaddr; | |
d2849fb2 | 225 | loff_t size; |
6798d35a MF |
226 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
227 | ||
228 | if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) { | |
7ecef14a | 229 | ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag\n", |
6798d35a MF |
230 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
231 | return -EROFS; | |
232 | } | |
233 | ||
234 | size = i_size_read(inode); | |
235 | ||
09cbfeaf | 236 | if (size > PAGE_SIZE || |
d9ae49d6 | 237 | size > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) { |
6798d35a | 238 | ocfs2_error(inode->i_sb, |
7ecef14a | 239 | "Inode %llu has with inline data has bad size: %Lu\n", |
d2849fb2 JK |
240 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
241 | (unsigned long long)size); | |
6798d35a MF |
242 | return -EROFS; |
243 | } | |
244 | ||
c4bc8dcb | 245 | kaddr = kmap_atomic(page); |
6798d35a MF |
246 | if (size) |
247 | memcpy(kaddr, di->id2.i_data.id_data, size); | |
248 | /* Clear the remaining part of the page */ | |
09cbfeaf | 249 | memset(kaddr + size, 0, PAGE_SIZE - size); |
6798d35a | 250 | flush_dcache_page(page); |
c4bc8dcb | 251 | kunmap_atomic(kaddr); |
6798d35a MF |
252 | |
253 | SetPageUptodate(page); | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
258 | static int ocfs2_readpage_inline(struct inode *inode, struct page *page) | |
259 | { | |
260 | int ret; | |
261 | struct buffer_head *di_bh = NULL; | |
6798d35a MF |
262 | |
263 | BUG_ON(!PageLocked(page)); | |
86c838b0 | 264 | BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)); |
6798d35a | 265 | |
b657c95c | 266 | ret = ocfs2_read_inode_block(inode, &di_bh); |
6798d35a MF |
267 | if (ret) { |
268 | mlog_errno(ret); | |
269 | goto out; | |
270 | } | |
271 | ||
272 | ret = ocfs2_read_inline_data(inode, page, di_bh); | |
273 | out: | |
274 | unlock_page(page); | |
275 | ||
276 | brelse(di_bh); | |
277 | return ret; | |
278 | } | |
279 | ||
ccd979bd MF |
280 | static int ocfs2_readpage(struct file *file, struct page *page) |
281 | { | |
282 | struct inode *inode = page->mapping->host; | |
6798d35a | 283 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
09cbfeaf | 284 | loff_t start = (loff_t)page->index << PAGE_SHIFT; |
ccd979bd MF |
285 | int ret, unlock = 1; |
286 | ||
9558156b TM |
287 | trace_ocfs2_readpage((unsigned long long)oi->ip_blkno, |
288 | (page ? page->index : 0)); | |
ccd979bd | 289 | |
e63aecb6 | 290 | ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page); |
ccd979bd MF |
291 | if (ret != 0) { |
292 | if (ret == AOP_TRUNCATED_PAGE) | |
293 | unlock = 0; | |
294 | mlog_errno(ret); | |
295 | goto out; | |
296 | } | |
297 | ||
6798d35a | 298 | if (down_read_trylock(&oi->ip_alloc_sem) == 0) { |
c7e25e6e JK |
299 | /* |
300 | * Unlock the page and cycle ip_alloc_sem so that we don't | |
301 | * busyloop waiting for ip_alloc_sem to unlock | |
302 | */ | |
e9dfc0b2 | 303 | ret = AOP_TRUNCATED_PAGE; |
c7e25e6e JK |
304 | unlock_page(page); |
305 | unlock = 0; | |
306 | down_read(&oi->ip_alloc_sem); | |
307 | up_read(&oi->ip_alloc_sem); | |
e63aecb6 | 308 | goto out_inode_unlock; |
e9dfc0b2 | 309 | } |
ccd979bd MF |
310 | |
311 | /* | |
312 | * i_size might have just been updated as we grabed the meta lock. We | |
313 | * might now be discovering a truncate that hit on another node. | |
314 | * block_read_full_page->get_block freaks out if it is asked to read | |
315 | * beyond the end of a file, so we check here. Callers | |
54cb8821 | 316 | * (generic_file_read, vm_ops->fault) are clever enough to check i_size |
ccd979bd MF |
317 | * and notice that the page they just read isn't needed. |
318 | * | |
319 | * XXX sys_readahead() seems to get that wrong? | |
320 | */ | |
321 | if (start >= i_size_read(inode)) { | |
eebd2aa3 | 322 | zero_user(page, 0, PAGE_SIZE); |
ccd979bd MF |
323 | SetPageUptodate(page); |
324 | ret = 0; | |
325 | goto out_alloc; | |
326 | } | |
327 | ||
6798d35a MF |
328 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
329 | ret = ocfs2_readpage_inline(inode, page); | |
330 | else | |
331 | ret = block_read_full_page(page, ocfs2_get_block); | |
ccd979bd MF |
332 | unlock = 0; |
333 | ||
ccd979bd | 334 | out_alloc: |
d324cd4c | 335 | up_read(&oi->ip_alloc_sem); |
e63aecb6 MF |
336 | out_inode_unlock: |
337 | ocfs2_inode_unlock(inode, 0); | |
ccd979bd MF |
338 | out: |
339 | if (unlock) | |
340 | unlock_page(page); | |
ccd979bd MF |
341 | return ret; |
342 | } | |
343 | ||
628a24f5 MF |
344 | /* |
345 | * This is used only for read-ahead. Failures or difficult to handle | |
346 | * situations are safe to ignore. | |
347 | * | |
348 | * Right now, we don't bother with BH_Boundary - in-inode extent lists | |
349 | * are quite large (243 extents on 4k blocks), so most inodes don't | |
350 | * grow out to a tree. If need be, detecting boundary extents could | |
351 | * trivially be added in a future version of ocfs2_get_block(). | |
352 | */ | |
d4388340 | 353 | static void ocfs2_readahead(struct readahead_control *rac) |
628a24f5 | 354 | { |
d4388340 MWO |
355 | int ret; |
356 | struct inode *inode = rac->mapping->host; | |
628a24f5 | 357 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
628a24f5 MF |
358 | |
359 | /* | |
360 | * Use the nonblocking flag for the dlm code to avoid page | |
361 | * lock inversion, but don't bother with retrying. | |
362 | */ | |
363 | ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK); | |
364 | if (ret) | |
d4388340 | 365 | return; |
628a24f5 | 366 | |
d4388340 MWO |
367 | if (down_read_trylock(&oi->ip_alloc_sem) == 0) |
368 | goto out_unlock; | |
628a24f5 MF |
369 | |
370 | /* | |
371 | * Don't bother with inline-data. There isn't anything | |
372 | * to read-ahead in that case anyway... | |
373 | */ | |
374 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) | |
d4388340 | 375 | goto out_up; |
628a24f5 MF |
376 | |
377 | /* | |
378 | * Check whether a remote node truncated this file - we just | |
379 | * drop out in that case as it's not worth handling here. | |
380 | */ | |
d4388340 MWO |
381 | if (readahead_pos(rac) >= i_size_read(inode)) |
382 | goto out_up; | |
628a24f5 | 383 | |
d4388340 | 384 | mpage_readahead(rac, ocfs2_get_block); |
628a24f5 | 385 | |
d4388340 | 386 | out_up: |
628a24f5 | 387 | up_read(&oi->ip_alloc_sem); |
d4388340 | 388 | out_unlock: |
628a24f5 | 389 | ocfs2_inode_unlock(inode, 0); |
628a24f5 MF |
390 | } |
391 | ||
ccd979bd MF |
392 | /* Note: Because we don't support holes, our allocation has |
393 | * already happened (allocation writes zeros to the file data) | |
394 | * so we don't have to worry about ordered writes in | |
395 | * ocfs2_writepage. | |
396 | * | |
397 | * ->writepage is called during the process of invalidating the page cache | |
398 | * during blocked lock processing. It can't block on any cluster locks | |
399 | * to during block mapping. It's relying on the fact that the block | |
400 | * mapping can't have disappeared under the dirty pages that it is | |
401 | * being asked to write back. | |
402 | */ | |
403 | static int ocfs2_writepage(struct page *page, struct writeback_control *wbc) | |
404 | { | |
9558156b TM |
405 | trace_ocfs2_writepage( |
406 | (unsigned long long)OCFS2_I(page->mapping->host)->ip_blkno, | |
407 | page->index); | |
ccd979bd | 408 | |
9558156b | 409 | return block_write_full_page(page, ocfs2_get_block, wbc); |
ccd979bd MF |
410 | } |
411 | ||
ccd979bd MF |
412 | /* Taken from ext3. We don't necessarily need the full blown |
413 | * functionality yet, but IMHO it's better to cut and paste the whole | |
414 | * thing so we can avoid introducing our own bugs (and easily pick up | |
415 | * their fixes when they happen) --Mark */ | |
60b11392 MF |
416 | int walk_page_buffers( handle_t *handle, |
417 | struct buffer_head *head, | |
418 | unsigned from, | |
419 | unsigned to, | |
420 | int *partial, | |
421 | int (*fn)( handle_t *handle, | |
422 | struct buffer_head *bh)) | |
ccd979bd MF |
423 | { |
424 | struct buffer_head *bh; | |
425 | unsigned block_start, block_end; | |
426 | unsigned blocksize = head->b_size; | |
427 | int err, ret = 0; | |
428 | struct buffer_head *next; | |
429 | ||
430 | for ( bh = head, block_start = 0; | |
431 | ret == 0 && (bh != head || !block_start); | |
432 | block_start = block_end, bh = next) | |
433 | { | |
434 | next = bh->b_this_page; | |
435 | block_end = block_start + blocksize; | |
436 | if (block_end <= from || block_start >= to) { | |
437 | if (partial && !buffer_uptodate(bh)) | |
438 | *partial = 1; | |
439 | continue; | |
440 | } | |
441 | err = (*fn)(handle, bh); | |
442 | if (!ret) | |
443 | ret = err; | |
444 | } | |
445 | return ret; | |
446 | } | |
447 | ||
ccd979bd MF |
448 | static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block) |
449 | { | |
450 | sector_t status; | |
451 | u64 p_blkno = 0; | |
452 | int err = 0; | |
453 | struct inode *inode = mapping->host; | |
454 | ||
9558156b TM |
455 | trace_ocfs2_bmap((unsigned long long)OCFS2_I(inode)->ip_blkno, |
456 | (unsigned long long)block); | |
ccd979bd | 457 | |
06a70305 DW |
458 | /* |
459 | * The swap code (ab-)uses ->bmap to get a block mapping and then | |
460 | * bypasseѕ the file system for actual I/O. We really can't allow | |
461 | * that on refcounted inodes, so we have to skip out here. And yes, | |
462 | * 0 is the magic code for a bmap error.. | |
463 | */ | |
464 | if (ocfs2_is_refcount_inode(inode)) | |
465 | return 0; | |
466 | ||
ccd979bd MF |
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 | ||
03f981cf JB |
502 | static int ocfs2_releasepage(struct page *page, gfp_t wait) |
503 | { | |
03f981cf JB |
504 | if (!page_has_buffers(page)) |
505 | return 0; | |
41ecc345 | 506 | return try_to_free_buffers(page); |
03f981cf JB |
507 | } |
508 | ||
9517bac6 MF |
509 | static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb, |
510 | u32 cpos, | |
511 | unsigned int *start, | |
512 | unsigned int *end) | |
513 | { | |
09cbfeaf | 514 | unsigned int cluster_start = 0, cluster_end = PAGE_SIZE; |
9517bac6 | 515 | |
09cbfeaf | 516 | if (unlikely(PAGE_SHIFT > osb->s_clustersize_bits)) { |
9517bac6 MF |
517 | unsigned int cpp; |
518 | ||
09cbfeaf | 519 | cpp = 1 << (PAGE_SHIFT - osb->s_clustersize_bits); |
9517bac6 MF |
520 | |
521 | cluster_start = cpos % cpp; | |
522 | cluster_start = cluster_start << osb->s_clustersize_bits; | |
523 | ||
524 | cluster_end = cluster_start + osb->s_clustersize; | |
525 | } | |
526 | ||
527 | BUG_ON(cluster_start > PAGE_SIZE); | |
528 | BUG_ON(cluster_end > PAGE_SIZE); | |
529 | ||
530 | if (start) | |
531 | *start = cluster_start; | |
532 | if (end) | |
533 | *end = cluster_end; | |
534 | } | |
535 | ||
536 | /* | |
537 | * 'from' and 'to' are the region in the page to avoid zeroing. | |
538 | * | |
539 | * If pagesize > clustersize, this function will avoid zeroing outside | |
540 | * of the cluster boundary. | |
541 | * | |
542 | * from == to == 0 is code for "zero the entire cluster region" | |
543 | */ | |
544 | static void ocfs2_clear_page_regions(struct page *page, | |
545 | struct ocfs2_super *osb, u32 cpos, | |
546 | unsigned from, unsigned to) | |
547 | { | |
548 | void *kaddr; | |
549 | unsigned int cluster_start, cluster_end; | |
550 | ||
551 | ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end); | |
552 | ||
c4bc8dcb | 553 | kaddr = kmap_atomic(page); |
9517bac6 MF |
554 | |
555 | if (from || to) { | |
556 | if (from > cluster_start) | |
557 | memset(kaddr + cluster_start, 0, from - cluster_start); | |
558 | if (to < cluster_end) | |
559 | memset(kaddr + to, 0, cluster_end - to); | |
560 | } else { | |
561 | memset(kaddr + cluster_start, 0, cluster_end - cluster_start); | |
562 | } | |
563 | ||
c4bc8dcb | 564 | kunmap_atomic(kaddr); |
9517bac6 MF |
565 | } |
566 | ||
4e9563fd MF |
567 | /* |
568 | * Nonsparse file systems fully allocate before we get to the write | |
569 | * code. This prevents ocfs2_write() from tagging the write as an | |
570 | * allocating one, which means ocfs2_map_page_blocks() might try to | |
571 | * read-in the blocks at the tail of our file. Avoid reading them by | |
572 | * testing i_size against each block offset. | |
573 | */ | |
574 | static int ocfs2_should_read_blk(struct inode *inode, struct page *page, | |
575 | unsigned int block_start) | |
576 | { | |
577 | u64 offset = page_offset(page) + block_start; | |
578 | ||
579 | if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) | |
580 | return 1; | |
581 | ||
582 | if (i_size_read(inode) > offset) | |
583 | return 1; | |
584 | ||
585 | return 0; | |
586 | } | |
587 | ||
9517bac6 | 588 | /* |
ebdec241 | 589 | * Some of this taken from __block_write_begin(). We already have our |
9517bac6 MF |
590 | * mapping by now though, and the entire write will be allocating or |
591 | * it won't, so not much need to use BH_New. | |
592 | * | |
593 | * This will also skip zeroing, which is handled externally. | |
594 | */ | |
60b11392 MF |
595 | int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno, |
596 | struct inode *inode, unsigned int from, | |
597 | unsigned int to, int new) | |
9517bac6 MF |
598 | { |
599 | int ret = 0; | |
600 | struct buffer_head *head, *bh, *wait[2], **wait_bh = wait; | |
601 | unsigned int block_end, block_start; | |
93407472 | 602 | unsigned int bsize = i_blocksize(inode); |
9517bac6 MF |
603 | |
604 | if (!page_has_buffers(page)) | |
605 | create_empty_buffers(page, bsize, 0); | |
606 | ||
607 | head = page_buffers(page); | |
608 | for (bh = head, block_start = 0; bh != head || !block_start; | |
609 | bh = bh->b_this_page, block_start += bsize) { | |
610 | block_end = block_start + bsize; | |
611 | ||
3a307ffc MF |
612 | clear_buffer_new(bh); |
613 | ||
9517bac6 MF |
614 | /* |
615 | * Ignore blocks outside of our i/o range - | |
616 | * they may belong to unallocated clusters. | |
617 | */ | |
60b11392 | 618 | if (block_start >= to || block_end <= from) { |
9517bac6 MF |
619 | if (PageUptodate(page)) |
620 | set_buffer_uptodate(bh); | |
621 | continue; | |
622 | } | |
623 | ||
624 | /* | |
625 | * For an allocating write with cluster size >= page | |
626 | * size, we always write the entire page. | |
627 | */ | |
3a307ffc MF |
628 | if (new) |
629 | set_buffer_new(bh); | |
9517bac6 MF |
630 | |
631 | if (!buffer_mapped(bh)) { | |
632 | map_bh(bh, inode->i_sb, *p_blkno); | |
e64855c6 | 633 | clean_bdev_bh_alias(bh); |
9517bac6 MF |
634 | } |
635 | ||
636 | if (PageUptodate(page)) { | |
637 | if (!buffer_uptodate(bh)) | |
638 | set_buffer_uptodate(bh); | |
639 | } else if (!buffer_uptodate(bh) && !buffer_delay(bh) && | |
bce99768 | 640 | !buffer_new(bh) && |
4e9563fd | 641 | ocfs2_should_read_blk(inode, page, block_start) && |
bce99768 | 642 | (block_start < from || block_end > to)) { |
dfec8a14 | 643 | ll_rw_block(REQ_OP_READ, 0, 1, &bh); |
9517bac6 MF |
644 | *wait_bh++=bh; |
645 | } | |
646 | ||
647 | *p_blkno = *p_blkno + 1; | |
648 | } | |
649 | ||
650 | /* | |
651 | * If we issued read requests - let them complete. | |
652 | */ | |
653 | while(wait_bh > wait) { | |
654 | wait_on_buffer(*--wait_bh); | |
655 | if (!buffer_uptodate(*wait_bh)) | |
656 | ret = -EIO; | |
657 | } | |
658 | ||
659 | if (ret == 0 || !new) | |
660 | return ret; | |
661 | ||
662 | /* | |
663 | * If we get -EIO above, zero out any newly allocated blocks | |
664 | * to avoid exposing stale data. | |
665 | */ | |
666 | bh = head; | |
667 | block_start = 0; | |
668 | do { | |
9517bac6 MF |
669 | block_end = block_start + bsize; |
670 | if (block_end <= from) | |
671 | goto next_bh; | |
672 | if (block_start >= to) | |
673 | break; | |
674 | ||
eebd2aa3 | 675 | zero_user(page, block_start, bh->b_size); |
9517bac6 MF |
676 | set_buffer_uptodate(bh); |
677 | mark_buffer_dirty(bh); | |
678 | ||
679 | next_bh: | |
680 | block_start = block_end; | |
681 | bh = bh->b_this_page; | |
682 | } while (bh != head); | |
683 | ||
684 | return ret; | |
685 | } | |
686 | ||
ea1754a0 | 687 | #if (PAGE_SIZE >= OCFS2_MAX_CLUSTERSIZE) |
3a307ffc MF |
688 | #define OCFS2_MAX_CTXT_PAGES 1 |
689 | #else | |
09cbfeaf | 690 | #define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_SIZE) |
3a307ffc MF |
691 | #endif |
692 | ||
09cbfeaf | 693 | #define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_SIZE / OCFS2_MIN_CLUSTERSIZE) |
3a307ffc | 694 | |
4506cfb6 RD |
695 | struct ocfs2_unwritten_extent { |
696 | struct list_head ue_node; | |
697 | struct list_head ue_ip_node; | |
698 | u32 ue_cpos; | |
699 | u32 ue_phys; | |
700 | }; | |
701 | ||
6af67d82 | 702 | /* |
3a307ffc | 703 | * Describe the state of a single cluster to be written to. |
6af67d82 | 704 | */ |
3a307ffc MF |
705 | struct ocfs2_write_cluster_desc { |
706 | u32 c_cpos; | |
707 | u32 c_phys; | |
708 | /* | |
709 | * Give this a unique field because c_phys eventually gets | |
710 | * filled. | |
711 | */ | |
712 | unsigned c_new; | |
b46637d5 | 713 | unsigned c_clear_unwritten; |
e7432675 | 714 | unsigned c_needs_zero; |
3a307ffc | 715 | }; |
6af67d82 | 716 | |
3a307ffc MF |
717 | struct ocfs2_write_ctxt { |
718 | /* Logical cluster position / len of write */ | |
719 | u32 w_cpos; | |
720 | u32 w_clen; | |
6af67d82 | 721 | |
e7432675 SM |
722 | /* First cluster allocated in a nonsparse extend */ |
723 | u32 w_first_new_cpos; | |
724 | ||
c1ad1e3c RD |
725 | /* Type of caller. Must be one of buffer, mmap, direct. */ |
726 | ocfs2_write_type_t w_type; | |
727 | ||
3a307ffc | 728 | struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE]; |
6af67d82 | 729 | |
3a307ffc MF |
730 | /* |
731 | * This is true if page_size > cluster_size. | |
732 | * | |
733 | * It triggers a set of special cases during write which might | |
734 | * have to deal with allocating writes to partial pages. | |
735 | */ | |
736 | unsigned int w_large_pages; | |
6af67d82 | 737 | |
3a307ffc MF |
738 | /* |
739 | * Pages involved in this write. | |
740 | * | |
741 | * w_target_page is the page being written to by the user. | |
742 | * | |
743 | * w_pages is an array of pages which always contains | |
744 | * w_target_page, and in the case of an allocating write with | |
745 | * page_size < cluster size, it will contain zero'd and mapped | |
746 | * pages adjacent to w_target_page which need to be written | |
747 | * out in so that future reads from that region will get | |
748 | * zero's. | |
749 | */ | |
3a307ffc | 750 | unsigned int w_num_pages; |
83fd9c7f | 751 | struct page *w_pages[OCFS2_MAX_CTXT_PAGES]; |
3a307ffc | 752 | struct page *w_target_page; |
eeb47d12 | 753 | |
5cffff9e WW |
754 | /* |
755 | * w_target_locked is used for page_mkwrite path indicating no unlocking | |
756 | * against w_target_page in ocfs2_write_end_nolock. | |
757 | */ | |
758 | unsigned int w_target_locked:1; | |
759 | ||
3a307ffc MF |
760 | /* |
761 | * ocfs2_write_end() uses this to know what the real range to | |
762 | * write in the target should be. | |
763 | */ | |
764 | unsigned int w_target_from; | |
765 | unsigned int w_target_to; | |
766 | ||
767 | /* | |
768 | * We could use journal_current_handle() but this is cleaner, | |
769 | * IMHO -Mark | |
770 | */ | |
771 | handle_t *w_handle; | |
772 | ||
773 | struct buffer_head *w_di_bh; | |
b27b7cbc MF |
774 | |
775 | struct ocfs2_cached_dealloc_ctxt w_dealloc; | |
4506cfb6 RD |
776 | |
777 | struct list_head w_unwritten_list; | |
63de8bd9 | 778 | unsigned int w_unwritten_count; |
3a307ffc MF |
779 | }; |
780 | ||
1d410a6e | 781 | void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages) |
3a307ffc MF |
782 | { |
783 | int i; | |
784 | ||
1d410a6e MF |
785 | for(i = 0; i < num_pages; i++) { |
786 | if (pages[i]) { | |
787 | unlock_page(pages[i]); | |
788 | mark_page_accessed(pages[i]); | |
09cbfeaf | 789 | put_page(pages[i]); |
1d410a6e | 790 | } |
6af67d82 | 791 | } |
1d410a6e MF |
792 | } |
793 | ||
136f49b9 | 794 | static void ocfs2_unlock_pages(struct ocfs2_write_ctxt *wc) |
1d410a6e | 795 | { |
5cffff9e WW |
796 | int i; |
797 | ||
798 | /* | |
799 | * w_target_locked is only set to true in the page_mkwrite() case. | |
800 | * The intent is to allow us to lock the target page from write_begin() | |
801 | * to write_end(). The caller must hold a ref on w_target_page. | |
802 | */ | |
803 | if (wc->w_target_locked) { | |
804 | BUG_ON(!wc->w_target_page); | |
805 | for (i = 0; i < wc->w_num_pages; i++) { | |
806 | if (wc->w_target_page == wc->w_pages[i]) { | |
807 | wc->w_pages[i] = NULL; | |
808 | break; | |
809 | } | |
810 | } | |
811 | mark_page_accessed(wc->w_target_page); | |
09cbfeaf | 812 | put_page(wc->w_target_page); |
5cffff9e | 813 | } |
1d410a6e | 814 | ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages); |
136f49b9 | 815 | } |
6af67d82 | 816 | |
4506cfb6 RD |
817 | static void ocfs2_free_unwritten_list(struct inode *inode, |
818 | struct list_head *head) | |
819 | { | |
820 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
c15471f7 | 821 | struct ocfs2_unwritten_extent *ue = NULL, *tmp = NULL; |
4506cfb6 | 822 | |
c15471f7 RD |
823 | list_for_each_entry_safe(ue, tmp, head, ue_node) { |
824 | list_del(&ue->ue_node); | |
4506cfb6 | 825 | spin_lock(&oi->ip_lock); |
c15471f7 | 826 | list_del(&ue->ue_ip_node); |
4506cfb6 | 827 | spin_unlock(&oi->ip_lock); |
c15471f7 | 828 | kfree(ue); |
4506cfb6 RD |
829 | } |
830 | } | |
831 | ||
832 | static void ocfs2_free_write_ctxt(struct inode *inode, | |
833 | struct ocfs2_write_ctxt *wc) | |
136f49b9 | 834 | { |
4506cfb6 | 835 | ocfs2_free_unwritten_list(inode, &wc->w_unwritten_list); |
136f49b9 | 836 | ocfs2_unlock_pages(wc); |
3a307ffc MF |
837 | brelse(wc->w_di_bh); |
838 | kfree(wc); | |
839 | } | |
840 | ||
841 | static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp, | |
842 | struct ocfs2_super *osb, loff_t pos, | |
c1ad1e3c RD |
843 | unsigned len, ocfs2_write_type_t type, |
844 | struct buffer_head *di_bh) | |
3a307ffc | 845 | { |
30b8548f | 846 | u32 cend; |
3a307ffc MF |
847 | struct ocfs2_write_ctxt *wc; |
848 | ||
849 | wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS); | |
850 | if (!wc) | |
851 | return -ENOMEM; | |
6af67d82 | 852 | |
3a307ffc | 853 | wc->w_cpos = pos >> osb->s_clustersize_bits; |
e7432675 | 854 | wc->w_first_new_cpos = UINT_MAX; |
30b8548f | 855 | cend = (pos + len - 1) >> osb->s_clustersize_bits; |
856 | wc->w_clen = cend - wc->w_cpos + 1; | |
607d44aa MF |
857 | get_bh(di_bh); |
858 | wc->w_di_bh = di_bh; | |
c1ad1e3c | 859 | wc->w_type = type; |
6af67d82 | 860 | |
09cbfeaf | 861 | if (unlikely(PAGE_SHIFT > osb->s_clustersize_bits)) |
3a307ffc MF |
862 | wc->w_large_pages = 1; |
863 | else | |
864 | wc->w_large_pages = 0; | |
865 | ||
b27b7cbc | 866 | ocfs2_init_dealloc_ctxt(&wc->w_dealloc); |
4506cfb6 | 867 | INIT_LIST_HEAD(&wc->w_unwritten_list); |
b27b7cbc | 868 | |
3a307ffc | 869 | *wcp = wc; |
6af67d82 | 870 | |
3a307ffc | 871 | return 0; |
6af67d82 MF |
872 | } |
873 | ||
9517bac6 | 874 | /* |
3a307ffc MF |
875 | * If a page has any new buffers, zero them out here, and mark them uptodate |
876 | * and dirty so they'll be written out (in order to prevent uninitialised | |
877 | * block data from leaking). And clear the new bit. | |
9517bac6 | 878 | */ |
3a307ffc | 879 | static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to) |
9517bac6 | 880 | { |
3a307ffc MF |
881 | unsigned int block_start, block_end; |
882 | struct buffer_head *head, *bh; | |
9517bac6 | 883 | |
3a307ffc MF |
884 | BUG_ON(!PageLocked(page)); |
885 | if (!page_has_buffers(page)) | |
886 | return; | |
9517bac6 | 887 | |
3a307ffc MF |
888 | bh = head = page_buffers(page); |
889 | block_start = 0; | |
890 | do { | |
891 | block_end = block_start + bh->b_size; | |
892 | ||
893 | if (buffer_new(bh)) { | |
894 | if (block_end > from && block_start < to) { | |
895 | if (!PageUptodate(page)) { | |
896 | unsigned start, end; | |
3a307ffc MF |
897 | |
898 | start = max(from, block_start); | |
899 | end = min(to, block_end); | |
900 | ||
eebd2aa3 | 901 | zero_user_segment(page, start, end); |
3a307ffc MF |
902 | set_buffer_uptodate(bh); |
903 | } | |
904 | ||
905 | clear_buffer_new(bh); | |
906 | mark_buffer_dirty(bh); | |
907 | } | |
908 | } | |
9517bac6 | 909 | |
3a307ffc MF |
910 | block_start = block_end; |
911 | bh = bh->b_this_page; | |
912 | } while (bh != head); | |
913 | } | |
914 | ||
915 | /* | |
916 | * Only called when we have a failure during allocating write to write | |
917 | * zero's to the newly allocated region. | |
918 | */ | |
919 | static void ocfs2_write_failure(struct inode *inode, | |
920 | struct ocfs2_write_ctxt *wc, | |
921 | loff_t user_pos, unsigned user_len) | |
922 | { | |
923 | int i; | |
09cbfeaf | 924 | unsigned from = user_pos & (PAGE_SIZE - 1), |
5c26a7b7 | 925 | to = user_pos + user_len; |
3a307ffc MF |
926 | struct page *tmppage; |
927 | ||
65c4db8c RD |
928 | if (wc->w_target_page) |
929 | ocfs2_zero_new_buffers(wc->w_target_page, from, to); | |
9517bac6 | 930 | |
3a307ffc MF |
931 | for(i = 0; i < wc->w_num_pages; i++) { |
932 | tmppage = wc->w_pages[i]; | |
9517bac6 | 933 | |
65c4db8c | 934 | if (tmppage && page_has_buffers(tmppage)) { |
53ef99ca | 935 | if (ocfs2_should_order_data(inode)) |
bbd0f327 JQ |
936 | ocfs2_jbd2_inode_add_write(wc->w_handle, inode, |
937 | user_pos, user_len); | |
961cecbe SM |
938 | |
939 | block_commit_write(tmppage, from, to); | |
940 | } | |
9517bac6 | 941 | } |
9517bac6 MF |
942 | } |
943 | ||
3a307ffc MF |
944 | static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno, |
945 | struct ocfs2_write_ctxt *wc, | |
946 | struct page *page, u32 cpos, | |
947 | loff_t user_pos, unsigned user_len, | |
948 | int new) | |
9517bac6 | 949 | { |
3a307ffc MF |
950 | int ret; |
951 | unsigned int map_from = 0, map_to = 0; | |
9517bac6 | 952 | unsigned int cluster_start, cluster_end; |
3a307ffc | 953 | unsigned int user_data_from = 0, user_data_to = 0; |
9517bac6 | 954 | |
3a307ffc | 955 | ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos, |
9517bac6 MF |
956 | &cluster_start, &cluster_end); |
957 | ||
272b62c1 GR |
958 | /* treat the write as new if the a hole/lseek spanned across |
959 | * the page boundary. | |
960 | */ | |
961 | new = new | ((i_size_read(inode) <= page_offset(page)) && | |
962 | (page_offset(page) <= user_pos)); | |
963 | ||
3a307ffc | 964 | if (page == wc->w_target_page) { |
09cbfeaf | 965 | map_from = user_pos & (PAGE_SIZE - 1); |
3a307ffc MF |
966 | map_to = map_from + user_len; |
967 | ||
968 | if (new) | |
969 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, | |
970 | cluster_start, cluster_end, | |
971 | new); | |
972 | else | |
973 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, | |
974 | map_from, map_to, new); | |
975 | if (ret) { | |
9517bac6 MF |
976 | mlog_errno(ret); |
977 | goto out; | |
978 | } | |
979 | ||
3a307ffc MF |
980 | user_data_from = map_from; |
981 | user_data_to = map_to; | |
9517bac6 | 982 | if (new) { |
3a307ffc MF |
983 | map_from = cluster_start; |
984 | map_to = cluster_end; | |
9517bac6 MF |
985 | } |
986 | } else { | |
987 | /* | |
988 | * If we haven't allocated the new page yet, we | |
989 | * shouldn't be writing it out without copying user | |
990 | * data. This is likely a math error from the caller. | |
991 | */ | |
992 | BUG_ON(!new); | |
993 | ||
3a307ffc MF |
994 | map_from = cluster_start; |
995 | map_to = cluster_end; | |
9517bac6 MF |
996 | |
997 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, | |
3a307ffc | 998 | cluster_start, cluster_end, new); |
9517bac6 MF |
999 | if (ret) { |
1000 | mlog_errno(ret); | |
1001 | goto out; | |
1002 | } | |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * Parts of newly allocated pages need to be zero'd. | |
1007 | * | |
1008 | * Above, we have also rewritten 'to' and 'from' - as far as | |
1009 | * the rest of the function is concerned, the entire cluster | |
1010 | * range inside of a page needs to be written. | |
1011 | * | |
1012 | * We can skip this if the page is up to date - it's already | |
1013 | * been zero'd from being read in as a hole. | |
1014 | */ | |
1015 | if (new && !PageUptodate(page)) | |
1016 | ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb), | |
3a307ffc | 1017 | cpos, user_data_from, user_data_to); |
9517bac6 MF |
1018 | |
1019 | flush_dcache_page(page); | |
1020 | ||
9517bac6 | 1021 | out: |
3a307ffc | 1022 | return ret; |
9517bac6 MF |
1023 | } |
1024 | ||
1025 | /* | |
3a307ffc | 1026 | * This function will only grab one clusters worth of pages. |
9517bac6 | 1027 | */ |
3a307ffc MF |
1028 | static int ocfs2_grab_pages_for_write(struct address_space *mapping, |
1029 | struct ocfs2_write_ctxt *wc, | |
693c241a JB |
1030 | u32 cpos, loff_t user_pos, |
1031 | unsigned user_len, int new, | |
7307de80 | 1032 | struct page *mmap_page) |
9517bac6 | 1033 | { |
3a307ffc | 1034 | int ret = 0, i; |
693c241a | 1035 | unsigned long start, target_index, end_index, index; |
9517bac6 | 1036 | struct inode *inode = mapping->host; |
693c241a | 1037 | loff_t last_byte; |
9517bac6 | 1038 | |
09cbfeaf | 1039 | target_index = user_pos >> PAGE_SHIFT; |
9517bac6 MF |
1040 | |
1041 | /* | |
1042 | * Figure out how many pages we'll be manipulating here. For | |
60b11392 | 1043 | * non allocating write, we just change the one |
693c241a JB |
1044 | * page. Otherwise, we'll need a whole clusters worth. If we're |
1045 | * writing past i_size, we only need enough pages to cover the | |
1046 | * last page of the write. | |
9517bac6 | 1047 | */ |
9517bac6 | 1048 | if (new) { |
3a307ffc MF |
1049 | wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb); |
1050 | start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos); | |
693c241a JB |
1051 | /* |
1052 | * We need the index *past* the last page we could possibly | |
1053 | * touch. This is the page past the end of the write or | |
1054 | * i_size, whichever is greater. | |
1055 | */ | |
1056 | last_byte = max(user_pos + user_len, i_size_read(inode)); | |
1057 | BUG_ON(last_byte < 1); | |
09cbfeaf | 1058 | end_index = ((last_byte - 1) >> PAGE_SHIFT) + 1; |
693c241a JB |
1059 | if ((start + wc->w_num_pages) > end_index) |
1060 | wc->w_num_pages = end_index - start; | |
9517bac6 | 1061 | } else { |
3a307ffc MF |
1062 | wc->w_num_pages = 1; |
1063 | start = target_index; | |
9517bac6 | 1064 | } |
09cbfeaf | 1065 | end_index = (user_pos + user_len - 1) >> PAGE_SHIFT; |
9517bac6 | 1066 | |
3a307ffc | 1067 | for(i = 0; i < wc->w_num_pages; i++) { |
9517bac6 MF |
1068 | index = start + i; |
1069 | ||
65c4db8c RD |
1070 | if (index >= target_index && index <= end_index && |
1071 | wc->w_type == OCFS2_WRITE_MMAP) { | |
7307de80 MF |
1072 | /* |
1073 | * ocfs2_pagemkwrite() is a little different | |
1074 | * and wants us to directly use the page | |
1075 | * passed in. | |
1076 | */ | |
1077 | lock_page(mmap_page); | |
1078 | ||
5cffff9e | 1079 | /* Exit and let the caller retry */ |
7307de80 | 1080 | if (mmap_page->mapping != mapping) { |
5cffff9e | 1081 | WARN_ON(mmap_page->mapping); |
7307de80 | 1082 | unlock_page(mmap_page); |
5cffff9e | 1083 | ret = -EAGAIN; |
7307de80 MF |
1084 | goto out; |
1085 | } | |
1086 | ||
09cbfeaf | 1087 | get_page(mmap_page); |
7307de80 | 1088 | wc->w_pages[i] = mmap_page; |
5cffff9e | 1089 | wc->w_target_locked = true; |
65c4db8c RD |
1090 | } else if (index >= target_index && index <= end_index && |
1091 | wc->w_type == OCFS2_WRITE_DIRECT) { | |
1092 | /* Direct write has no mapping page. */ | |
1093 | wc->w_pages[i] = NULL; | |
1094 | continue; | |
7307de80 MF |
1095 | } else { |
1096 | wc->w_pages[i] = find_or_create_page(mapping, index, | |
1097 | GFP_NOFS); | |
1098 | if (!wc->w_pages[i]) { | |
1099 | ret = -ENOMEM; | |
1100 | mlog_errno(ret); | |
1101 | goto out; | |
1102 | } | |
9517bac6 | 1103 | } |
1269529b | 1104 | wait_for_stable_page(wc->w_pages[i]); |
3a307ffc MF |
1105 | |
1106 | if (index == target_index) | |
1107 | wc->w_target_page = wc->w_pages[i]; | |
9517bac6 | 1108 | } |
3a307ffc | 1109 | out: |
5cffff9e WW |
1110 | if (ret) |
1111 | wc->w_target_locked = false; | |
3a307ffc MF |
1112 | return ret; |
1113 | } | |
1114 | ||
1115 | /* | |
1116 | * Prepare a single cluster for write one cluster into the file. | |
1117 | */ | |
1118 | static int ocfs2_write_cluster(struct address_space *mapping, | |
2de6a3c7 | 1119 | u32 *phys, unsigned int new, |
b46637d5 | 1120 | unsigned int clear_unwritten, |
e7432675 | 1121 | unsigned int should_zero, |
b27b7cbc | 1122 | struct ocfs2_alloc_context *data_ac, |
3a307ffc MF |
1123 | struct ocfs2_alloc_context *meta_ac, |
1124 | struct ocfs2_write_ctxt *wc, u32 cpos, | |
1125 | loff_t user_pos, unsigned user_len) | |
1126 | { | |
b46637d5 | 1127 | int ret, i; |
2de6a3c7 | 1128 | u64 p_blkno; |
3a307ffc | 1129 | struct inode *inode = mapping->host; |
f99b9b7c | 1130 | struct ocfs2_extent_tree et; |
2de6a3c7 | 1131 | int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); |
3a307ffc | 1132 | |
9517bac6 | 1133 | if (new) { |
3a307ffc MF |
1134 | u32 tmp_pos; |
1135 | ||
9517bac6 MF |
1136 | /* |
1137 | * This is safe to call with the page locks - it won't take | |
1138 | * any additional semaphores or cluster locks. | |
1139 | */ | |
3a307ffc | 1140 | tmp_pos = cpos; |
0eb8d47e | 1141 | ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode, |
b46637d5 RD |
1142 | &tmp_pos, 1, !clear_unwritten, |
1143 | wc->w_di_bh, wc->w_handle, | |
1144 | data_ac, meta_ac, NULL); | |
9517bac6 MF |
1145 | /* |
1146 | * This shouldn't happen because we must have already | |
1147 | * calculated the correct meta data allocation required. The | |
1148 | * internal tree allocation code should know how to increase | |
1149 | * transaction credits itself. | |
1150 | * | |
1151 | * If need be, we could handle -EAGAIN for a | |
1152 | * RESTART_TRANS here. | |
1153 | */ | |
1154 | mlog_bug_on_msg(ret == -EAGAIN, | |
1155 | "Inode %llu: EAGAIN return during allocation.\n", | |
1156 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1157 | if (ret < 0) { | |
1158 | mlog_errno(ret); | |
1159 | goto out; | |
1160 | } | |
b46637d5 | 1161 | } else if (clear_unwritten) { |
5e404e9e JB |
1162 | ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), |
1163 | wc->w_di_bh); | |
f99b9b7c | 1164 | ret = ocfs2_mark_extent_written(inode, &et, |
2de6a3c7 | 1165 | wc->w_handle, cpos, 1, *phys, |
f99b9b7c | 1166 | meta_ac, &wc->w_dealloc); |
b27b7cbc MF |
1167 | if (ret < 0) { |
1168 | mlog_errno(ret); | |
1169 | goto out; | |
1170 | } | |
1171 | } | |
3a307ffc | 1172 | |
3a307ffc MF |
1173 | /* |
1174 | * The only reason this should fail is due to an inability to | |
1175 | * find the extent added. | |
1176 | */ | |
2de6a3c7 | 1177 | ret = ocfs2_get_clusters(inode, cpos, phys, NULL, NULL); |
9517bac6 | 1178 | if (ret < 0) { |
61fb9ea4 | 1179 | mlog(ML_ERROR, "Get physical blkno failed for inode %llu, " |
2de6a3c7 RD |
1180 | "at logical cluster %u", |
1181 | (unsigned long long)OCFS2_I(inode)->ip_blkno, cpos); | |
9517bac6 MF |
1182 | goto out; |
1183 | } | |
1184 | ||
2de6a3c7 RD |
1185 | BUG_ON(*phys == 0); |
1186 | ||
1187 | p_blkno = ocfs2_clusters_to_blocks(inode->i_sb, *phys); | |
1188 | if (!should_zero) | |
1189 | p_blkno += (user_pos >> inode->i_sb->s_blocksize_bits) & (u64)(bpc - 1); | |
9517bac6 | 1190 | |
3a307ffc MF |
1191 | for(i = 0; i < wc->w_num_pages; i++) { |
1192 | int tmpret; | |
9517bac6 | 1193 | |
65c4db8c RD |
1194 | /* This is the direct io target page. */ |
1195 | if (wc->w_pages[i] == NULL) { | |
1196 | p_blkno++; | |
1197 | continue; | |
1198 | } | |
1199 | ||
3a307ffc MF |
1200 | tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc, |
1201 | wc->w_pages[i], cpos, | |
b27b7cbc MF |
1202 | user_pos, user_len, |
1203 | should_zero); | |
3a307ffc MF |
1204 | if (tmpret) { |
1205 | mlog_errno(tmpret); | |
1206 | if (ret == 0) | |
cbfa9639 | 1207 | ret = tmpret; |
3a307ffc | 1208 | } |
9517bac6 MF |
1209 | } |
1210 | ||
3a307ffc MF |
1211 | /* |
1212 | * We only have cleanup to do in case of allocating write. | |
1213 | */ | |
1214 | if (ret && new) | |
1215 | ocfs2_write_failure(inode, wc, user_pos, user_len); | |
1216 | ||
9517bac6 | 1217 | out: |
9517bac6 | 1218 | |
3a307ffc | 1219 | return ret; |
9517bac6 MF |
1220 | } |
1221 | ||
0d172baa MF |
1222 | static int ocfs2_write_cluster_by_desc(struct address_space *mapping, |
1223 | struct ocfs2_alloc_context *data_ac, | |
1224 | struct ocfs2_alloc_context *meta_ac, | |
1225 | struct ocfs2_write_ctxt *wc, | |
1226 | loff_t pos, unsigned len) | |
1227 | { | |
1228 | int ret, i; | |
db56246c MF |
1229 | loff_t cluster_off; |
1230 | unsigned int local_len = len; | |
0d172baa | 1231 | struct ocfs2_write_cluster_desc *desc; |
db56246c | 1232 | struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb); |
0d172baa MF |
1233 | |
1234 | for (i = 0; i < wc->w_clen; i++) { | |
1235 | desc = &wc->w_desc[i]; | |
1236 | ||
db56246c MF |
1237 | /* |
1238 | * We have to make sure that the total write passed in | |
1239 | * doesn't extend past a single cluster. | |
1240 | */ | |
1241 | local_len = len; | |
1242 | cluster_off = pos & (osb->s_clustersize - 1); | |
1243 | if ((cluster_off + local_len) > osb->s_clustersize) | |
1244 | local_len = osb->s_clustersize - cluster_off; | |
1245 | ||
2de6a3c7 | 1246 | ret = ocfs2_write_cluster(mapping, &desc->c_phys, |
b46637d5 RD |
1247 | desc->c_new, |
1248 | desc->c_clear_unwritten, | |
e7432675 SM |
1249 | desc->c_needs_zero, |
1250 | data_ac, meta_ac, | |
db56246c | 1251 | wc, desc->c_cpos, pos, local_len); |
0d172baa MF |
1252 | if (ret) { |
1253 | mlog_errno(ret); | |
1254 | goto out; | |
1255 | } | |
db56246c MF |
1256 | |
1257 | len -= local_len; | |
1258 | pos += local_len; | |
0d172baa MF |
1259 | } |
1260 | ||
1261 | ret = 0; | |
1262 | out: | |
1263 | return ret; | |
1264 | } | |
1265 | ||
3a307ffc MF |
1266 | /* |
1267 | * ocfs2_write_end() wants to know which parts of the target page it | |
1268 | * should complete the write on. It's easiest to compute them ahead of | |
1269 | * time when a more complete view of the write is available. | |
1270 | */ | |
1271 | static void ocfs2_set_target_boundaries(struct ocfs2_super *osb, | |
1272 | struct ocfs2_write_ctxt *wc, | |
1273 | loff_t pos, unsigned len, int alloc) | |
9517bac6 | 1274 | { |
3a307ffc | 1275 | struct ocfs2_write_cluster_desc *desc; |
9517bac6 | 1276 | |
09cbfeaf | 1277 | wc->w_target_from = pos & (PAGE_SIZE - 1); |
3a307ffc MF |
1278 | wc->w_target_to = wc->w_target_from + len; |
1279 | ||
1280 | if (alloc == 0) | |
1281 | return; | |
1282 | ||
1283 | /* | |
1284 | * Allocating write - we may have different boundaries based | |
1285 | * on page size and cluster size. | |
1286 | * | |
1287 | * NOTE: We can no longer compute one value from the other as | |
1288 | * the actual write length and user provided length may be | |
1289 | * different. | |
1290 | */ | |
9517bac6 | 1291 | |
3a307ffc MF |
1292 | if (wc->w_large_pages) { |
1293 | /* | |
1294 | * We only care about the 1st and last cluster within | |
b27b7cbc | 1295 | * our range and whether they should be zero'd or not. Either |
3a307ffc MF |
1296 | * value may be extended out to the start/end of a |
1297 | * newly allocated cluster. | |
1298 | */ | |
1299 | desc = &wc->w_desc[0]; | |
e7432675 | 1300 | if (desc->c_needs_zero) |
3a307ffc MF |
1301 | ocfs2_figure_cluster_boundaries(osb, |
1302 | desc->c_cpos, | |
1303 | &wc->w_target_from, | |
1304 | NULL); | |
1305 | ||
1306 | desc = &wc->w_desc[wc->w_clen - 1]; | |
e7432675 | 1307 | if (desc->c_needs_zero) |
3a307ffc MF |
1308 | ocfs2_figure_cluster_boundaries(osb, |
1309 | desc->c_cpos, | |
1310 | NULL, | |
1311 | &wc->w_target_to); | |
1312 | } else { | |
1313 | wc->w_target_from = 0; | |
09cbfeaf | 1314 | wc->w_target_to = PAGE_SIZE; |
3a307ffc | 1315 | } |
9517bac6 MF |
1316 | } |
1317 | ||
4506cfb6 RD |
1318 | /* |
1319 | * Check if this extent is marked UNWRITTEN by direct io. If so, we need not to | |
1320 | * do the zero work. And should not to clear UNWRITTEN since it will be cleared | |
1321 | * by the direct io procedure. | |
1322 | * If this is a new extent that allocated by direct io, we should mark it in | |
1323 | * the ip_unwritten_list. | |
1324 | */ | |
1325 | static int ocfs2_unwritten_check(struct inode *inode, | |
1326 | struct ocfs2_write_ctxt *wc, | |
1327 | struct ocfs2_write_cluster_desc *desc) | |
1328 | { | |
1329 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
c15471f7 | 1330 | struct ocfs2_unwritten_extent *ue = NULL, *new = NULL; |
4506cfb6 RD |
1331 | int ret = 0; |
1332 | ||
1333 | if (!desc->c_needs_zero) | |
1334 | return 0; | |
1335 | ||
1336 | retry: | |
1337 | spin_lock(&oi->ip_lock); | |
1338 | /* Needs not to zero no metter buffer or direct. The one who is zero | |
1339 | * the cluster is doing zero. And he will clear unwritten after all | |
1340 | * cluster io finished. */ | |
c15471f7 RD |
1341 | list_for_each_entry(ue, &oi->ip_unwritten_list, ue_ip_node) { |
1342 | if (desc->c_cpos == ue->ue_cpos) { | |
4506cfb6 RD |
1343 | BUG_ON(desc->c_new); |
1344 | desc->c_needs_zero = 0; | |
1345 | desc->c_clear_unwritten = 0; | |
1346 | goto unlock; | |
1347 | } | |
1348 | } | |
1349 | ||
1350 | if (wc->w_type != OCFS2_WRITE_DIRECT) | |
1351 | goto unlock; | |
1352 | ||
1353 | if (new == NULL) { | |
1354 | spin_unlock(&oi->ip_lock); | |
1355 | new = kmalloc(sizeof(struct ocfs2_unwritten_extent), | |
1356 | GFP_NOFS); | |
1357 | if (new == NULL) { | |
1358 | ret = -ENOMEM; | |
1359 | goto out; | |
1360 | } | |
1361 | goto retry; | |
1362 | } | |
1363 | /* This direct write will doing zero. */ | |
1364 | new->ue_cpos = desc->c_cpos; | |
1365 | new->ue_phys = desc->c_phys; | |
1366 | desc->c_clear_unwritten = 0; | |
1367 | list_add_tail(&new->ue_ip_node, &oi->ip_unwritten_list); | |
1368 | list_add_tail(&new->ue_node, &wc->w_unwritten_list); | |
63de8bd9 | 1369 | wc->w_unwritten_count++; |
4506cfb6 RD |
1370 | new = NULL; |
1371 | unlock: | |
1372 | spin_unlock(&oi->ip_lock); | |
1373 | out: | |
0ae1c2db | 1374 | kfree(new); |
4506cfb6 RD |
1375 | return ret; |
1376 | } | |
1377 | ||
0d172baa MF |
1378 | /* |
1379 | * Populate each single-cluster write descriptor in the write context | |
1380 | * with information about the i/o to be done. | |
b27b7cbc MF |
1381 | * |
1382 | * Returns the number of clusters that will have to be allocated, as | |
1383 | * well as a worst case estimate of the number of extent records that | |
1384 | * would have to be created during a write to an unwritten region. | |
0d172baa MF |
1385 | */ |
1386 | static int ocfs2_populate_write_desc(struct inode *inode, | |
1387 | struct ocfs2_write_ctxt *wc, | |
b27b7cbc MF |
1388 | unsigned int *clusters_to_alloc, |
1389 | unsigned int *extents_to_split) | |
9517bac6 | 1390 | { |
0d172baa | 1391 | int ret; |
3a307ffc | 1392 | struct ocfs2_write_cluster_desc *desc; |
0d172baa | 1393 | unsigned int num_clusters = 0; |
b27b7cbc | 1394 | unsigned int ext_flags = 0; |
0d172baa MF |
1395 | u32 phys = 0; |
1396 | int i; | |
9517bac6 | 1397 | |
b27b7cbc MF |
1398 | *clusters_to_alloc = 0; |
1399 | *extents_to_split = 0; | |
1400 | ||
3a307ffc MF |
1401 | for (i = 0; i < wc->w_clen; i++) { |
1402 | desc = &wc->w_desc[i]; | |
1403 | desc->c_cpos = wc->w_cpos + i; | |
1404 | ||
1405 | if (num_clusters == 0) { | |
b27b7cbc MF |
1406 | /* |
1407 | * Need to look up the next extent record. | |
1408 | */ | |
3a307ffc | 1409 | ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys, |
b27b7cbc | 1410 | &num_clusters, &ext_flags); |
3a307ffc MF |
1411 | if (ret) { |
1412 | mlog_errno(ret); | |
607d44aa | 1413 | goto out; |
3a307ffc | 1414 | } |
b27b7cbc | 1415 | |
293b2f70 TM |
1416 | /* We should already CoW the refcountd extent. */ |
1417 | BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED); | |
1418 | ||
b27b7cbc MF |
1419 | /* |
1420 | * Assume worst case - that we're writing in | |
1421 | * the middle of the extent. | |
1422 | * | |
1423 | * We can assume that the write proceeds from | |
1424 | * left to right, in which case the extent | |
1425 | * insert code is smart enough to coalesce the | |
1426 | * next splits into the previous records created. | |
1427 | */ | |
1428 | if (ext_flags & OCFS2_EXT_UNWRITTEN) | |
1429 | *extents_to_split = *extents_to_split + 2; | |
3a307ffc MF |
1430 | } else if (phys) { |
1431 | /* | |
1432 | * Only increment phys if it doesn't describe | |
1433 | * a hole. | |
1434 | */ | |
1435 | phys++; | |
1436 | } | |
1437 | ||
e7432675 SM |
1438 | /* |
1439 | * If w_first_new_cpos is < UINT_MAX, we have a non-sparse | |
1440 | * file that got extended. w_first_new_cpos tells us | |
1441 | * where the newly allocated clusters are so we can | |
1442 | * zero them. | |
1443 | */ | |
1444 | if (desc->c_cpos >= wc->w_first_new_cpos) { | |
1445 | BUG_ON(phys == 0); | |
1446 | desc->c_needs_zero = 1; | |
1447 | } | |
1448 | ||
3a307ffc MF |
1449 | desc->c_phys = phys; |
1450 | if (phys == 0) { | |
1451 | desc->c_new = 1; | |
e7432675 | 1452 | desc->c_needs_zero = 1; |
b46637d5 | 1453 | desc->c_clear_unwritten = 1; |
0d172baa | 1454 | *clusters_to_alloc = *clusters_to_alloc + 1; |
3a307ffc | 1455 | } |
e7432675 SM |
1456 | |
1457 | if (ext_flags & OCFS2_EXT_UNWRITTEN) { | |
b46637d5 | 1458 | desc->c_clear_unwritten = 1; |
e7432675 SM |
1459 | desc->c_needs_zero = 1; |
1460 | } | |
3a307ffc | 1461 | |
4506cfb6 RD |
1462 | ret = ocfs2_unwritten_check(inode, wc, desc); |
1463 | if (ret) { | |
1464 | mlog_errno(ret); | |
1465 | goto out; | |
1466 | } | |
1467 | ||
3a307ffc | 1468 | num_clusters--; |
9517bac6 MF |
1469 | } |
1470 | ||
0d172baa MF |
1471 | ret = 0; |
1472 | out: | |
1473 | return ret; | |
1474 | } | |
1475 | ||
1afc32b9 MF |
1476 | static int ocfs2_write_begin_inline(struct address_space *mapping, |
1477 | struct inode *inode, | |
1478 | struct ocfs2_write_ctxt *wc) | |
1479 | { | |
1480 | int ret; | |
1481 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1482 | struct page *page; | |
1483 | handle_t *handle; | |
1484 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; | |
1485 | ||
f775da2f JB |
1486 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
1487 | if (IS_ERR(handle)) { | |
1488 | ret = PTR_ERR(handle); | |
1489 | mlog_errno(ret); | |
1490 | goto out; | |
1491 | } | |
1492 | ||
1afc32b9 MF |
1493 | page = find_or_create_page(mapping, 0, GFP_NOFS); |
1494 | if (!page) { | |
f775da2f | 1495 | ocfs2_commit_trans(osb, handle); |
1afc32b9 MF |
1496 | ret = -ENOMEM; |
1497 | mlog_errno(ret); | |
1498 | goto out; | |
1499 | } | |
1500 | /* | |
1501 | * If we don't set w_num_pages then this page won't get unlocked | |
1502 | * and freed on cleanup of the write context. | |
1503 | */ | |
1504 | wc->w_pages[0] = wc->w_target_page = page; | |
1505 | wc->w_num_pages = 1; | |
1506 | ||
0cf2f763 | 1507 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh, |
13723d00 | 1508 | OCFS2_JOURNAL_ACCESS_WRITE); |
1afc32b9 MF |
1509 | if (ret) { |
1510 | ocfs2_commit_trans(osb, handle); | |
1511 | ||
1512 | mlog_errno(ret); | |
1513 | goto out; | |
1514 | } | |
1515 | ||
1516 | if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) | |
1517 | ocfs2_set_inode_data_inline(inode, di); | |
1518 | ||
1519 | if (!PageUptodate(page)) { | |
1520 | ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh); | |
1521 | if (ret) { | |
1522 | ocfs2_commit_trans(osb, handle); | |
1523 | ||
1524 | goto out; | |
1525 | } | |
1526 | } | |
1527 | ||
1528 | wc->w_handle = handle; | |
1529 | out: | |
1530 | return ret; | |
1531 | } | |
1532 | ||
1533 | int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size) | |
1534 | { | |
1535 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; | |
1536 | ||
0d8a4e0c | 1537 | if (new_size <= le16_to_cpu(di->id2.i_data.id_count)) |
1afc32b9 MF |
1538 | return 1; |
1539 | return 0; | |
1540 | } | |
1541 | ||
1542 | static int ocfs2_try_to_write_inline_data(struct address_space *mapping, | |
1543 | struct inode *inode, loff_t pos, | |
1544 | unsigned len, struct page *mmap_page, | |
1545 | struct ocfs2_write_ctxt *wc) | |
1546 | { | |
1547 | int ret, written = 0; | |
1548 | loff_t end = pos + len; | |
1549 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
d9ae49d6 | 1550 | struct ocfs2_dinode *di = NULL; |
1afc32b9 | 1551 | |
9558156b TM |
1552 | trace_ocfs2_try_to_write_inline_data((unsigned long long)oi->ip_blkno, |
1553 | len, (unsigned long long)pos, | |
1554 | oi->ip_dyn_features); | |
1afc32b9 MF |
1555 | |
1556 | /* | |
1557 | * Handle inodes which already have inline data 1st. | |
1558 | */ | |
1559 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { | |
1560 | if (mmap_page == NULL && | |
1561 | ocfs2_size_fits_inline_data(wc->w_di_bh, end)) | |
1562 | goto do_inline_write; | |
1563 | ||
1564 | /* | |
1565 | * The write won't fit - we have to give this inode an | |
1566 | * inline extent list now. | |
1567 | */ | |
1568 | ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh); | |
1569 | if (ret) | |
1570 | mlog_errno(ret); | |
1571 | goto out; | |
1572 | } | |
1573 | ||
1574 | /* | |
1575 | * Check whether the inode can accept inline data. | |
1576 | */ | |
1577 | if (oi->ip_clusters != 0 || i_size_read(inode) != 0) | |
1578 | return 0; | |
1579 | ||
1580 | /* | |
1581 | * Check whether the write can fit. | |
1582 | */ | |
d9ae49d6 TY |
1583 | di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; |
1584 | if (mmap_page || | |
1585 | end > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) | |
1afc32b9 MF |
1586 | return 0; |
1587 | ||
1588 | do_inline_write: | |
1589 | ret = ocfs2_write_begin_inline(mapping, inode, wc); | |
1590 | if (ret) { | |
1591 | mlog_errno(ret); | |
1592 | goto out; | |
1593 | } | |
1594 | ||
1595 | /* | |
1596 | * This signals to the caller that the data can be written | |
1597 | * inline. | |
1598 | */ | |
1599 | written = 1; | |
1600 | out: | |
1601 | return written ? written : ret; | |
1602 | } | |
1603 | ||
65ed39d6 MF |
1604 | /* |
1605 | * This function only does anything for file systems which can't | |
1606 | * handle sparse files. | |
1607 | * | |
1608 | * What we want to do here is fill in any hole between the current end | |
1609 | * of allocation and the end of our write. That way the rest of the | |
1610 | * write path can treat it as an non-allocating write, which has no | |
1611 | * special case code for sparse/nonsparse files. | |
1612 | */ | |
5693486b JB |
1613 | static int ocfs2_expand_nonsparse_inode(struct inode *inode, |
1614 | struct buffer_head *di_bh, | |
1615 | loff_t pos, unsigned len, | |
65ed39d6 MF |
1616 | struct ocfs2_write_ctxt *wc) |
1617 | { | |
1618 | int ret; | |
65ed39d6 MF |
1619 | loff_t newsize = pos + len; |
1620 | ||
5693486b | 1621 | BUG_ON(ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))); |
65ed39d6 MF |
1622 | |
1623 | if (newsize <= i_size_read(inode)) | |
1624 | return 0; | |
1625 | ||
5693486b | 1626 | ret = ocfs2_extend_no_holes(inode, di_bh, newsize, pos); |
65ed39d6 MF |
1627 | if (ret) |
1628 | mlog_errno(ret); | |
1629 | ||
46e62556 RD |
1630 | /* There is no wc if this is call from direct. */ |
1631 | if (wc) | |
1632 | wc->w_first_new_cpos = | |
1633 | ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode)); | |
e7432675 | 1634 | |
65ed39d6 MF |
1635 | return ret; |
1636 | } | |
1637 | ||
5693486b JB |
1638 | static int ocfs2_zero_tail(struct inode *inode, struct buffer_head *di_bh, |
1639 | loff_t pos) | |
1640 | { | |
1641 | int ret = 0; | |
1642 | ||
1643 | BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))); | |
1644 | if (pos > i_size_read(inode)) | |
1645 | ret = ocfs2_zero_extend(inode, di_bh, pos); | |
1646 | ||
1647 | return ret; | |
1648 | } | |
1649 | ||
c1ad1e3c RD |
1650 | int ocfs2_write_begin_nolock(struct address_space *mapping, |
1651 | loff_t pos, unsigned len, ocfs2_write_type_t type, | |
0d172baa MF |
1652 | struct page **pagep, void **fsdata, |
1653 | struct buffer_head *di_bh, struct page *mmap_page) | |
1654 | { | |
e7432675 | 1655 | int ret, cluster_of_pages, credits = OCFS2_INODE_UPDATE_CREDITS; |
50308d81 | 1656 | unsigned int clusters_to_alloc, extents_to_split, clusters_need = 0; |
0d172baa MF |
1657 | struct ocfs2_write_ctxt *wc; |
1658 | struct inode *inode = mapping->host; | |
1659 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1660 | struct ocfs2_dinode *di; | |
1661 | struct ocfs2_alloc_context *data_ac = NULL; | |
1662 | struct ocfs2_alloc_context *meta_ac = NULL; | |
1663 | handle_t *handle; | |
f99b9b7c | 1664 | struct ocfs2_extent_tree et; |
50308d81 | 1665 | int try_free = 1, ret1; |
0d172baa | 1666 | |
50308d81 | 1667 | try_again: |
c1ad1e3c | 1668 | ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, type, di_bh); |
0d172baa MF |
1669 | if (ret) { |
1670 | mlog_errno(ret); | |
1671 | return ret; | |
1672 | } | |
1673 | ||
1afc32b9 MF |
1674 | if (ocfs2_supports_inline_data(osb)) { |
1675 | ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len, | |
1676 | mmap_page, wc); | |
1677 | if (ret == 1) { | |
1678 | ret = 0; | |
1679 | goto success; | |
1680 | } | |
1681 | if (ret < 0) { | |
1682 | mlog_errno(ret); | |
1683 | goto out; | |
1684 | } | |
1685 | } | |
1686 | ||
46e62556 RD |
1687 | /* Direct io change i_size late, should not zero tail here. */ |
1688 | if (type != OCFS2_WRITE_DIRECT) { | |
1689 | if (ocfs2_sparse_alloc(osb)) | |
1690 | ret = ocfs2_zero_tail(inode, di_bh, pos); | |
1691 | else | |
1692 | ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos, | |
1693 | len, wc); | |
1694 | if (ret) { | |
1695 | mlog_errno(ret); | |
1696 | goto out; | |
1697 | } | |
65ed39d6 MF |
1698 | } |
1699 | ||
293b2f70 TM |
1700 | ret = ocfs2_check_range_for_refcount(inode, pos, len); |
1701 | if (ret < 0) { | |
1702 | mlog_errno(ret); | |
1703 | goto out; | |
1704 | } else if (ret == 1) { | |
50308d81 | 1705 | clusters_need = wc->w_clen; |
c7dd3392 | 1706 | ret = ocfs2_refcount_cow(inode, di_bh, |
37f8a2bf | 1707 | wc->w_cpos, wc->w_clen, UINT_MAX); |
293b2f70 TM |
1708 | if (ret) { |
1709 | mlog_errno(ret); | |
1710 | goto out; | |
1711 | } | |
1712 | } | |
1713 | ||
b27b7cbc MF |
1714 | ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc, |
1715 | &extents_to_split); | |
0d172baa MF |
1716 | if (ret) { |
1717 | mlog_errno(ret); | |
1718 | goto out; | |
1719 | } | |
50308d81 | 1720 | clusters_need += clusters_to_alloc; |
0d172baa MF |
1721 | |
1722 | di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; | |
1723 | ||
9558156b TM |
1724 | trace_ocfs2_write_begin_nolock( |
1725 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1726 | (long long)i_size_read(inode), | |
1727 | le32_to_cpu(di->i_clusters), | |
c1ad1e3c | 1728 | pos, len, type, mmap_page, |
9558156b TM |
1729 | clusters_to_alloc, extents_to_split); |
1730 | ||
3a307ffc MF |
1731 | /* |
1732 | * We set w_target_from, w_target_to here so that | |
1733 | * ocfs2_write_end() knows which range in the target page to | |
1734 | * write out. An allocation requires that we write the entire | |
1735 | * cluster range. | |
1736 | */ | |
b27b7cbc | 1737 | if (clusters_to_alloc || extents_to_split) { |
3a307ffc MF |
1738 | /* |
1739 | * XXX: We are stretching the limits of | |
b27b7cbc | 1740 | * ocfs2_lock_allocators(). It greatly over-estimates |
3a307ffc MF |
1741 | * the work to be done. |
1742 | */ | |
5e404e9e JB |
1743 | ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), |
1744 | wc->w_di_bh); | |
f99b9b7c | 1745 | ret = ocfs2_lock_allocators(inode, &et, |
231b87d1 | 1746 | clusters_to_alloc, extents_to_split, |
f99b9b7c | 1747 | &data_ac, &meta_ac); |
9517bac6 MF |
1748 | if (ret) { |
1749 | mlog_errno(ret); | |
607d44aa | 1750 | goto out; |
9517bac6 MF |
1751 | } |
1752 | ||
4fe370af MF |
1753 | if (data_ac) |
1754 | data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv; | |
1755 | ||
811f933d | 1756 | credits = ocfs2_calc_extend_credits(inode->i_sb, |
06f9da6e | 1757 | &di->id2.i_list); |
46e62556 RD |
1758 | } else if (type == OCFS2_WRITE_DIRECT) |
1759 | /* direct write needs not to start trans if no extents alloc. */ | |
1760 | goto success; | |
9517bac6 | 1761 | |
e7432675 SM |
1762 | /* |
1763 | * We have to zero sparse allocated clusters, unwritten extent clusters, | |
1764 | * and non-sparse clusters we just extended. For non-sparse writes, | |
1765 | * we know zeros will only be needed in the first and/or last cluster. | |
1766 | */ | |
4506cfb6 RD |
1767 | if (wc->w_clen && (wc->w_desc[0].c_needs_zero || |
1768 | wc->w_desc[wc->w_clen - 1].c_needs_zero)) | |
e7432675 SM |
1769 | cluster_of_pages = 1; |
1770 | else | |
1771 | cluster_of_pages = 0; | |
1772 | ||
1773 | ocfs2_set_target_boundaries(osb, wc, pos, len, cluster_of_pages); | |
3a307ffc | 1774 | |
9517bac6 MF |
1775 | handle = ocfs2_start_trans(osb, credits); |
1776 | if (IS_ERR(handle)) { | |
1777 | ret = PTR_ERR(handle); | |
1778 | mlog_errno(ret); | |
607d44aa | 1779 | goto out; |
9517bac6 MF |
1780 | } |
1781 | ||
3a307ffc MF |
1782 | wc->w_handle = handle; |
1783 | ||
5dd4056d CH |
1784 | if (clusters_to_alloc) { |
1785 | ret = dquot_alloc_space_nodirty(inode, | |
1786 | ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc)); | |
1787 | if (ret) | |
1788 | goto out_commit; | |
a90714c1 | 1789 | } |
7f27ec97 | 1790 | |
0cf2f763 | 1791 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh, |
13723d00 | 1792 | OCFS2_JOURNAL_ACCESS_WRITE); |
3a307ffc | 1793 | if (ret) { |
9517bac6 | 1794 | mlog_errno(ret); |
a90714c1 | 1795 | goto out_quota; |
9517bac6 MF |
1796 | } |
1797 | ||
3a307ffc MF |
1798 | /* |
1799 | * Fill our page array first. That way we've grabbed enough so | |
1800 | * that we can zero and flush if we error after adding the | |
1801 | * extent. | |
1802 | */ | |
693c241a | 1803 | ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, len, |
e7432675 | 1804 | cluster_of_pages, mmap_page); |
5cffff9e | 1805 | if (ret && ret != -EAGAIN) { |
9517bac6 | 1806 | mlog_errno(ret); |
a90714c1 | 1807 | goto out_quota; |
9517bac6 MF |
1808 | } |
1809 | ||
5cffff9e WW |
1810 | /* |
1811 | * ocfs2_grab_pages_for_write() returns -EAGAIN if it could not lock | |
1812 | * the target page. In this case, we exit with no error and no target | |
1813 | * page. This will trigger the caller, page_mkwrite(), to re-try | |
1814 | * the operation. | |
1815 | */ | |
1816 | if (ret == -EAGAIN) { | |
1817 | BUG_ON(wc->w_target_page); | |
1818 | ret = 0; | |
1819 | goto out_quota; | |
1820 | } | |
1821 | ||
0d172baa MF |
1822 | ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos, |
1823 | len); | |
1824 | if (ret) { | |
1825 | mlog_errno(ret); | |
a90714c1 | 1826 | goto out_quota; |
9517bac6 | 1827 | } |
9517bac6 | 1828 | |
3a307ffc MF |
1829 | if (data_ac) |
1830 | ocfs2_free_alloc_context(data_ac); | |
1831 | if (meta_ac) | |
1832 | ocfs2_free_alloc_context(meta_ac); | |
9517bac6 | 1833 | |
1afc32b9 | 1834 | success: |
65c4db8c RD |
1835 | if (pagep) |
1836 | *pagep = wc->w_target_page; | |
3a307ffc MF |
1837 | *fsdata = wc; |
1838 | return 0; | |
a90714c1 JK |
1839 | out_quota: |
1840 | if (clusters_to_alloc) | |
5dd4056d | 1841 | dquot_free_space(inode, |
a90714c1 | 1842 | ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc)); |
9517bac6 MF |
1843 | out_commit: |
1844 | ocfs2_commit_trans(osb, handle); | |
1845 | ||
9517bac6 | 1846 | out: |
c33f0785 ER |
1847 | /* |
1848 | * The mmapped page won't be unlocked in ocfs2_free_write_ctxt(), | |
1849 | * even in case of error here like ENOSPC and ENOMEM. So, we need | |
1850 | * to unlock the target page manually to prevent deadlocks when | |
1851 | * retrying again on ENOSPC, or when returning non-VM_FAULT_LOCKED | |
1852 | * to VM code. | |
1853 | */ | |
1854 | if (wc->w_target_locked) | |
1855 | unlock_page(mmap_page); | |
1856 | ||
4506cfb6 | 1857 | ocfs2_free_write_ctxt(inode, wc); |
3a307ffc | 1858 | |
b1214e47 | 1859 | if (data_ac) { |
9517bac6 | 1860 | ocfs2_free_alloc_context(data_ac); |
b1214e47 X |
1861 | data_ac = NULL; |
1862 | } | |
1863 | if (meta_ac) { | |
9517bac6 | 1864 | ocfs2_free_alloc_context(meta_ac); |
b1214e47 X |
1865 | meta_ac = NULL; |
1866 | } | |
50308d81 TM |
1867 | |
1868 | if (ret == -ENOSPC && try_free) { | |
1869 | /* | |
1870 | * Try to free some truncate log so that we can have enough | |
1871 | * clusters to allocate. | |
1872 | */ | |
1873 | try_free = 0; | |
1874 | ||
1875 | ret1 = ocfs2_try_to_free_truncate_log(osb, clusters_need); | |
1876 | if (ret1 == 1) | |
1877 | goto try_again; | |
1878 | ||
1879 | if (ret1 < 0) | |
1880 | mlog_errno(ret1); | |
1881 | } | |
1882 | ||
3a307ffc MF |
1883 | return ret; |
1884 | } | |
1885 | ||
b6af1bcd NP |
1886 | static int ocfs2_write_begin(struct file *file, struct address_space *mapping, |
1887 | loff_t pos, unsigned len, unsigned flags, | |
1888 | struct page **pagep, void **fsdata) | |
607d44aa MF |
1889 | { |
1890 | int ret; | |
1891 | struct buffer_head *di_bh = NULL; | |
1892 | struct inode *inode = mapping->host; | |
1893 | ||
e63aecb6 | 1894 | ret = ocfs2_inode_lock(inode, &di_bh, 1); |
607d44aa MF |
1895 | if (ret) { |
1896 | mlog_errno(ret); | |
1897 | return ret; | |
1898 | } | |
1899 | ||
1900 | /* | |
1901 | * Take alloc sem here to prevent concurrent lookups. That way | |
1902 | * the mapping, zeroing and tree manipulation within | |
1903 | * ocfs2_write() will be safe against ->readpage(). This | |
1904 | * should also serve to lock out allocation from a shared | |
1905 | * writeable region. | |
1906 | */ | |
1907 | down_write(&OCFS2_I(inode)->ip_alloc_sem); | |
1908 | ||
c1ad1e3c RD |
1909 | ret = ocfs2_write_begin_nolock(mapping, pos, len, OCFS2_WRITE_BUFFER, |
1910 | pagep, fsdata, di_bh, NULL); | |
607d44aa MF |
1911 | if (ret) { |
1912 | mlog_errno(ret); | |
c934a92d | 1913 | goto out_fail; |
607d44aa MF |
1914 | } |
1915 | ||
1916 | brelse(di_bh); | |
1917 | ||
1918 | return 0; | |
1919 | ||
607d44aa MF |
1920 | out_fail: |
1921 | up_write(&OCFS2_I(inode)->ip_alloc_sem); | |
1922 | ||
1923 | brelse(di_bh); | |
e63aecb6 | 1924 | ocfs2_inode_unlock(inode, 1); |
607d44aa MF |
1925 | |
1926 | return ret; | |
1927 | } | |
1928 | ||
1afc32b9 MF |
1929 | static void ocfs2_write_end_inline(struct inode *inode, loff_t pos, |
1930 | unsigned len, unsigned *copied, | |
1931 | struct ocfs2_dinode *di, | |
1932 | struct ocfs2_write_ctxt *wc) | |
1933 | { | |
1934 | void *kaddr; | |
1935 | ||
1936 | if (unlikely(*copied < len)) { | |
1937 | if (!PageUptodate(wc->w_target_page)) { | |
1938 | *copied = 0; | |
1939 | return; | |
1940 | } | |
1941 | } | |
1942 | ||
c4bc8dcb | 1943 | kaddr = kmap_atomic(wc->w_target_page); |
1afc32b9 | 1944 | memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied); |
c4bc8dcb | 1945 | kunmap_atomic(kaddr); |
1afc32b9 | 1946 | |
9558156b TM |
1947 | trace_ocfs2_write_end_inline( |
1948 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1afc32b9 MF |
1949 | (unsigned long long)pos, *copied, |
1950 | le16_to_cpu(di->id2.i_data.id_count), | |
1951 | le16_to_cpu(di->i_dyn_features)); | |
1952 | } | |
1953 | ||
7307de80 | 1954 | int ocfs2_write_end_nolock(struct address_space *mapping, |
07f38d97 | 1955 | loff_t pos, unsigned len, unsigned copied, void *fsdata) |
3a307ffc | 1956 | { |
7f27ec97 | 1957 | int i, ret; |
09cbfeaf | 1958 | unsigned from, to, start = pos & (PAGE_SIZE - 1); |
3a307ffc MF |
1959 | struct inode *inode = mapping->host; |
1960 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1961 | struct ocfs2_write_ctxt *wc = fsdata; | |
1962 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; | |
1963 | handle_t *handle = wc->w_handle; | |
1964 | struct page *tmppage; | |
1965 | ||
4506cfb6 RD |
1966 | BUG_ON(!list_empty(&wc->w_unwritten_list)); |
1967 | ||
46e62556 RD |
1968 | if (handle) { |
1969 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), | |
1970 | wc->w_di_bh, OCFS2_JOURNAL_ACCESS_WRITE); | |
1971 | if (ret) { | |
1972 | copied = ret; | |
1973 | mlog_errno(ret); | |
1974 | goto out; | |
1975 | } | |
7f27ec97 | 1976 | } |
1977 | ||
1afc32b9 MF |
1978 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
1979 | ocfs2_write_end_inline(inode, pos, len, &copied, di, wc); | |
1980 | goto out_write_size; | |
1981 | } | |
1982 | ||
65c4db8c | 1983 | if (unlikely(copied < len) && wc->w_target_page) { |
3a307ffc MF |
1984 | if (!PageUptodate(wc->w_target_page)) |
1985 | copied = 0; | |
1986 | ||
1987 | ocfs2_zero_new_buffers(wc->w_target_page, start+copied, | |
1988 | start+len); | |
1989 | } | |
65c4db8c RD |
1990 | if (wc->w_target_page) |
1991 | flush_dcache_page(wc->w_target_page); | |
3a307ffc MF |
1992 | |
1993 | for(i = 0; i < wc->w_num_pages; i++) { | |
1994 | tmppage = wc->w_pages[i]; | |
1995 | ||
65c4db8c RD |
1996 | /* This is the direct io target page. */ |
1997 | if (tmppage == NULL) | |
1998 | continue; | |
1999 | ||
3a307ffc MF |
2000 | if (tmppage == wc->w_target_page) { |
2001 | from = wc->w_target_from; | |
2002 | to = wc->w_target_to; | |
2003 | ||
09cbfeaf KS |
2004 | BUG_ON(from > PAGE_SIZE || |
2005 | to > PAGE_SIZE || | |
3a307ffc MF |
2006 | to < from); |
2007 | } else { | |
2008 | /* | |
2009 | * Pages adjacent to the target (if any) imply | |
2010 | * a hole-filling write in which case we want | |
2011 | * to flush their entire range. | |
2012 | */ | |
2013 | from = 0; | |
09cbfeaf | 2014 | to = PAGE_SIZE; |
3a307ffc MF |
2015 | } |
2016 | ||
961cecbe | 2017 | if (page_has_buffers(tmppage)) { |
bbd0f327 JQ |
2018 | if (handle && ocfs2_should_order_data(inode)) { |
2019 | loff_t start_byte = | |
2020 | ((loff_t)tmppage->index << PAGE_SHIFT) + | |
2021 | from; | |
2022 | loff_t length = to - from; | |
2023 | ocfs2_jbd2_inode_add_write(handle, inode, | |
2024 | start_byte, length); | |
2025 | } | |
961cecbe SM |
2026 | block_commit_write(tmppage, from, to); |
2027 | } | |
3a307ffc MF |
2028 | } |
2029 | ||
1afc32b9 | 2030 | out_write_size: |
46e62556 RD |
2031 | /* Direct io do not update i_size here. */ |
2032 | if (wc->w_type != OCFS2_WRITE_DIRECT) { | |
2033 | pos += copied; | |
2034 | if (pos > i_size_read(inode)) { | |
2035 | i_size_write(inode, pos); | |
2036 | mark_inode_dirty(inode); | |
2037 | } | |
2038 | inode->i_blocks = ocfs2_inode_sector_count(inode); | |
2039 | di->i_size = cpu_to_le64((u64)i_size_read(inode)); | |
078cd827 | 2040 | inode->i_mtime = inode->i_ctime = current_time(inode); |
46e62556 RD |
2041 | di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec); |
2042 | di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); | |
583fee3e JJB |
2043 | if (handle) |
2044 | ocfs2_update_inode_fsync_trans(handle, inode, 1); | |
46e62556 RD |
2045 | } |
2046 | if (handle) | |
2047 | ocfs2_journal_dirty(handle, wc->w_di_bh); | |
3a307ffc | 2048 | |
7f27ec97 | 2049 | out: |
136f49b9 JB |
2050 | /* unlock pages before dealloc since it needs acquiring j_trans_barrier |
2051 | * lock, or it will cause a deadlock since journal commit threads holds | |
2052 | * this lock and will ask for the page lock when flushing the data. | |
2053 | * put it here to preserve the unlock order. | |
2054 | */ | |
2055 | ocfs2_unlock_pages(wc); | |
2056 | ||
46e62556 RD |
2057 | if (handle) |
2058 | ocfs2_commit_trans(osb, handle); | |
59a5e416 | 2059 | |
b27b7cbc MF |
2060 | ocfs2_run_deallocs(osb, &wc->w_dealloc); |
2061 | ||
136f49b9 JB |
2062 | brelse(wc->w_di_bh); |
2063 | kfree(wc); | |
607d44aa MF |
2064 | |
2065 | return copied; | |
2066 | } | |
2067 | ||
b6af1bcd NP |
2068 | static int ocfs2_write_end(struct file *file, struct address_space *mapping, |
2069 | loff_t pos, unsigned len, unsigned copied, | |
2070 | struct page *page, void *fsdata) | |
607d44aa MF |
2071 | { |
2072 | int ret; | |
2073 | struct inode *inode = mapping->host; | |
2074 | ||
07f38d97 | 2075 | ret = ocfs2_write_end_nolock(mapping, pos, len, copied, fsdata); |
607d44aa | 2076 | |
3a307ffc | 2077 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
e63aecb6 | 2078 | ocfs2_inode_unlock(inode, 1); |
9517bac6 | 2079 | |
607d44aa | 2080 | return ret; |
9517bac6 MF |
2081 | } |
2082 | ||
c15471f7 RD |
2083 | struct ocfs2_dio_write_ctxt { |
2084 | struct list_head dw_zero_list; | |
2085 | unsigned dw_zero_count; | |
2086 | int dw_orphaned; | |
2087 | pid_t dw_writer_pid; | |
2088 | }; | |
2089 | ||
2090 | static struct ocfs2_dio_write_ctxt * | |
2091 | ocfs2_dio_alloc_write_ctx(struct buffer_head *bh, int *alloc) | |
2092 | { | |
2093 | struct ocfs2_dio_write_ctxt *dwc = NULL; | |
2094 | ||
2095 | if (bh->b_private) | |
2096 | return bh->b_private; | |
2097 | ||
2098 | dwc = kmalloc(sizeof(struct ocfs2_dio_write_ctxt), GFP_NOFS); | |
2099 | if (dwc == NULL) | |
2100 | return NULL; | |
2101 | INIT_LIST_HEAD(&dwc->dw_zero_list); | |
2102 | dwc->dw_zero_count = 0; | |
2103 | dwc->dw_orphaned = 0; | |
2104 | dwc->dw_writer_pid = task_pid_nr(current); | |
2105 | bh->b_private = dwc; | |
2106 | *alloc = 1; | |
2107 | ||
2108 | return dwc; | |
2109 | } | |
2110 | ||
2111 | static void ocfs2_dio_free_write_ctx(struct inode *inode, | |
2112 | struct ocfs2_dio_write_ctxt *dwc) | |
2113 | { | |
2114 | ocfs2_free_unwritten_list(inode, &dwc->dw_zero_list); | |
2115 | kfree(dwc); | |
2116 | } | |
2117 | ||
2118 | /* | |
2119 | * TODO: Make this into a generic get_blocks function. | |
2120 | * | |
2121 | * From do_direct_io in direct-io.c: | |
2122 | * "So what we do is to permit the ->get_blocks function to populate | |
2123 | * bh.b_size with the size of IO which is permitted at this offset and | |
2124 | * this i_blkbits." | |
2125 | * | |
2126 | * This function is called directly from get_more_blocks in direct-io.c. | |
2127 | * | |
2128 | * called like this: dio->get_blocks(dio->inode, fs_startblk, | |
2129 | * fs_count, map_bh, dio->rw == WRITE); | |
2130 | */ | |
3e4c56d4 | 2131 | static int ocfs2_dio_wr_get_block(struct inode *inode, sector_t iblock, |
c15471f7 RD |
2132 | struct buffer_head *bh_result, int create) |
2133 | { | |
2134 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
a86a72a4 | 2135 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
c15471f7 RD |
2136 | struct ocfs2_write_ctxt *wc; |
2137 | struct ocfs2_write_cluster_desc *desc = NULL; | |
2138 | struct ocfs2_dio_write_ctxt *dwc = NULL; | |
2139 | struct buffer_head *di_bh = NULL; | |
2140 | u64 p_blkno; | |
7a243c82 JG |
2141 | unsigned int i_blkbits = inode->i_sb->s_blocksize_bits; |
2142 | loff_t pos = iblock << i_blkbits; | |
2143 | sector_t endblk = (i_size_read(inode) - 1) >> i_blkbits; | |
c15471f7 RD |
2144 | unsigned len, total_len = bh_result->b_size; |
2145 | int ret = 0, first_get_block = 0; | |
2146 | ||
2147 | len = osb->s_clustersize - (pos & (osb->s_clustersize - 1)); | |
2148 | len = min(total_len, len); | |
2149 | ||
7a243c82 JG |
2150 | /* |
2151 | * bh_result->b_size is count in get_more_blocks according to write | |
2152 | * "pos" and "end", we need map twice to return different buffer state: | |
2153 | * 1. area in file size, not set NEW; | |
2154 | * 2. area out file size, set NEW. | |
2155 | * | |
2156 | * iblock endblk | |
2157 | * |--------|---------|---------|--------- | |
2158 | * |<-------area in file------->| | |
2159 | */ | |
2160 | ||
2161 | if ((iblock <= endblk) && | |
2162 | ((iblock + ((len - 1) >> i_blkbits)) > endblk)) | |
2163 | len = (endblk - iblock + 1) << i_blkbits; | |
2164 | ||
c15471f7 RD |
2165 | mlog(0, "get block of %lu at %llu:%u req %u\n", |
2166 | inode->i_ino, pos, len, total_len); | |
2167 | ||
ce170828 RD |
2168 | /* |
2169 | * Because we need to change file size in ocfs2_dio_end_io_write(), or | |
2170 | * we may need to add it to orphan dir. So can not fall to fast path | |
2171 | * while file size will be changed. | |
2172 | */ | |
2173 | if (pos + total_len <= i_size_read(inode)) { | |
a86a72a4 | 2174 | |
3e4c56d4 | 2175 | /* This is the fast path for re-write. */ |
2176 | ret = ocfs2_lock_get_block(inode, iblock, bh_result, create); | |
ce170828 RD |
2177 | if (buffer_mapped(bh_result) && |
2178 | !buffer_new(bh_result) && | |
2179 | ret == 0) | |
2180 | goto out; | |
c15471f7 | 2181 | |
ce170828 RD |
2182 | /* Clear state set by ocfs2_get_block. */ |
2183 | bh_result->b_state = 0; | |
2184 | } | |
c15471f7 RD |
2185 | |
2186 | dwc = ocfs2_dio_alloc_write_ctx(bh_result, &first_get_block); | |
2187 | if (unlikely(dwc == NULL)) { | |
2188 | ret = -ENOMEM; | |
2189 | mlog_errno(ret); | |
2190 | goto out; | |
2191 | } | |
2192 | ||
2193 | if (ocfs2_clusters_for_bytes(inode->i_sb, pos + total_len) > | |
2194 | ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode)) && | |
2195 | !dwc->dw_orphaned) { | |
2196 | /* | |
2197 | * when we are going to alloc extents beyond file size, add the | |
2198 | * inode to orphan dir, so we can recall those spaces when | |
2199 | * system crashed during write. | |
2200 | */ | |
2201 | ret = ocfs2_add_inode_to_orphan(osb, inode); | |
2202 | if (ret < 0) { | |
2203 | mlog_errno(ret); | |
2204 | goto out; | |
2205 | } | |
2206 | dwc->dw_orphaned = 1; | |
2207 | } | |
2208 | ||
2209 | ret = ocfs2_inode_lock(inode, &di_bh, 1); | |
2210 | if (ret) { | |
2211 | mlog_errno(ret); | |
2212 | goto out; | |
2213 | } | |
2214 | ||
a86a72a4 RD |
2215 | down_write(&oi->ip_alloc_sem); |
2216 | ||
c15471f7 | 2217 | if (first_get_block) { |
1119d3c0 | 2218 | if (ocfs2_sparse_alloc(osb)) |
c15471f7 RD |
2219 | ret = ocfs2_zero_tail(inode, di_bh, pos); |
2220 | else | |
2221 | ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos, | |
2222 | total_len, NULL); | |
2223 | if (ret < 0) { | |
2224 | mlog_errno(ret); | |
2225 | goto unlock; | |
2226 | } | |
2227 | } | |
2228 | ||
2229 | ret = ocfs2_write_begin_nolock(inode->i_mapping, pos, len, | |
2230 | OCFS2_WRITE_DIRECT, NULL, | |
2231 | (void **)&wc, di_bh, NULL); | |
2232 | if (ret) { | |
2233 | mlog_errno(ret); | |
2234 | goto unlock; | |
2235 | } | |
2236 | ||
2237 | desc = &wc->w_desc[0]; | |
2238 | ||
2239 | p_blkno = ocfs2_clusters_to_blocks(inode->i_sb, desc->c_phys); | |
2240 | BUG_ON(p_blkno == 0); | |
2241 | p_blkno += iblock & (u64)(ocfs2_clusters_to_blocks(inode->i_sb, 1) - 1); | |
2242 | ||
2243 | map_bh(bh_result, inode->i_sb, p_blkno); | |
2244 | bh_result->b_size = len; | |
2245 | if (desc->c_needs_zero) | |
2246 | set_buffer_new(bh_result); | |
2247 | ||
7a243c82 JG |
2248 | if (iblock > endblk) |
2249 | set_buffer_new(bh_result); | |
2250 | ||
c15471f7 RD |
2251 | /* May sleep in end_io. It should not happen in a irq context. So defer |
2252 | * it to dio work queue. */ | |
2253 | set_buffer_defer_completion(bh_result); | |
2254 | ||
2255 | if (!list_empty(&wc->w_unwritten_list)) { | |
2256 | struct ocfs2_unwritten_extent *ue = NULL; | |
2257 | ||
2258 | ue = list_first_entry(&wc->w_unwritten_list, | |
2259 | struct ocfs2_unwritten_extent, | |
2260 | ue_node); | |
2261 | BUG_ON(ue->ue_cpos != desc->c_cpos); | |
2262 | /* The physical address may be 0, fill it. */ | |
2263 | ue->ue_phys = desc->c_phys; | |
2264 | ||
2265 | list_splice_tail_init(&wc->w_unwritten_list, &dwc->dw_zero_list); | |
63de8bd9 | 2266 | dwc->dw_zero_count += wc->w_unwritten_count; |
c15471f7 RD |
2267 | } |
2268 | ||
07f38d97 | 2269 | ret = ocfs2_write_end_nolock(inode->i_mapping, pos, len, len, wc); |
c15471f7 RD |
2270 | BUG_ON(ret != len); |
2271 | ret = 0; | |
2272 | unlock: | |
a86a72a4 | 2273 | up_write(&oi->ip_alloc_sem); |
c15471f7 RD |
2274 | ocfs2_inode_unlock(inode, 1); |
2275 | brelse(di_bh); | |
2276 | out: | |
2277 | if (ret < 0) | |
2278 | ret = -EIO; | |
2279 | return ret; | |
2280 | } | |
2281 | ||
08554955 DW |
2282 | static int ocfs2_dio_end_io_write(struct inode *inode, |
2283 | struct ocfs2_dio_write_ctxt *dwc, | |
2284 | loff_t offset, | |
2285 | ssize_t bytes) | |
c15471f7 RD |
2286 | { |
2287 | struct ocfs2_cached_dealloc_ctxt dealloc; | |
2288 | struct ocfs2_extent_tree et; | |
2289 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
a86a72a4 | 2290 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
c15471f7 RD |
2291 | struct ocfs2_unwritten_extent *ue = NULL; |
2292 | struct buffer_head *di_bh = NULL; | |
2293 | struct ocfs2_dinode *di; | |
2294 | struct ocfs2_alloc_context *data_ac = NULL; | |
2295 | struct ocfs2_alloc_context *meta_ac = NULL; | |
2296 | handle_t *handle = NULL; | |
2297 | loff_t end = offset + bytes; | |
90bd070a | 2298 | int ret = 0, credits = 0; |
c15471f7 RD |
2299 | |
2300 | ocfs2_init_dealloc_ctxt(&dealloc); | |
2301 | ||
2302 | /* We do clear unwritten, delete orphan, change i_size here. If neither | |
2303 | * of these happen, we can skip all this. */ | |
2304 | if (list_empty(&dwc->dw_zero_list) && | |
2305 | end <= i_size_read(inode) && | |
2306 | !dwc->dw_orphaned) | |
2307 | goto out; | |
2308 | ||
a86a72a4 RD |
2309 | ret = ocfs2_inode_lock(inode, &di_bh, 1); |
2310 | if (ret < 0) { | |
2311 | mlog_errno(ret); | |
2312 | goto out; | |
2313 | } | |
2314 | ||
2315 | down_write(&oi->ip_alloc_sem); | |
2316 | ||
c15471f7 RD |
2317 | /* Delete orphan before acquire i_mutex. */ |
2318 | if (dwc->dw_orphaned) { | |
2319 | BUG_ON(dwc->dw_writer_pid != task_pid_nr(current)); | |
2320 | ||
2321 | end = end > i_size_read(inode) ? end : 0; | |
2322 | ||
2323 | ret = ocfs2_del_inode_from_orphan(osb, inode, di_bh, | |
2324 | !!end, end); | |
2325 | if (ret < 0) | |
2326 | mlog_errno(ret); | |
2327 | } | |
2328 | ||
aef73a61 | 2329 | di = (struct ocfs2_dinode *)di_bh->b_data; |
c15471f7 RD |
2330 | |
2331 | ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh); | |
2332 | ||
71a36944 CG |
2333 | /* Attach dealloc with extent tree in case that we may reuse extents |
2334 | * which are already unlinked from current extent tree due to extent | |
2335 | * rotation and merging. | |
2336 | */ | |
2337 | et.et_dealloc = &dealloc; | |
2338 | ||
c15471f7 RD |
2339 | ret = ocfs2_lock_allocators(inode, &et, 0, dwc->dw_zero_count*2, |
2340 | &data_ac, &meta_ac); | |
28888681 RD |
2341 | if (ret) { |
2342 | mlog_errno(ret); | |
2343 | goto unlock; | |
2344 | } | |
c15471f7 RD |
2345 | |
2346 | credits = ocfs2_calc_extend_credits(inode->i_sb, &di->id2.i_list); | |
2347 | ||
2348 | handle = ocfs2_start_trans(osb, credits); | |
2349 | if (IS_ERR(handle)) { | |
2350 | ret = PTR_ERR(handle); | |
2351 | mlog_errno(ret); | |
2352 | goto unlock; | |
2353 | } | |
2354 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, | |
2355 | OCFS2_JOURNAL_ACCESS_WRITE); | |
2356 | if (ret) { | |
2357 | mlog_errno(ret); | |
2358 | goto commit; | |
2359 | } | |
2360 | ||
2361 | list_for_each_entry(ue, &dwc->dw_zero_list, ue_node) { | |
2362 | ret = ocfs2_mark_extent_written(inode, &et, handle, | |
2363 | ue->ue_cpos, 1, | |
2364 | ue->ue_phys, | |
2365 | meta_ac, &dealloc); | |
2366 | if (ret < 0) { | |
2367 | mlog_errno(ret); | |
2368 | break; | |
2369 | } | |
2370 | } | |
2371 | ||
2372 | if (end > i_size_read(inode)) { | |
2373 | ret = ocfs2_set_inode_size(handle, inode, di_bh, end); | |
2374 | if (ret < 0) | |
2375 | mlog_errno(ret); | |
2376 | } | |
2377 | commit: | |
2378 | ocfs2_commit_trans(osb, handle); | |
2379 | unlock: | |
a86a72a4 | 2380 | up_write(&oi->ip_alloc_sem); |
c15471f7 RD |
2381 | ocfs2_inode_unlock(inode, 1); |
2382 | brelse(di_bh); | |
2383 | out: | |
c15471f7 RD |
2384 | if (data_ac) |
2385 | ocfs2_free_alloc_context(data_ac); | |
2386 | if (meta_ac) | |
2387 | ocfs2_free_alloc_context(meta_ac); | |
28888681 | 2388 | ocfs2_run_deallocs(osb, &dealloc); |
28888681 | 2389 | ocfs2_dio_free_write_ctx(inode, dwc); |
08554955 DW |
2390 | |
2391 | return ret; | |
c15471f7 RD |
2392 | } |
2393 | ||
2394 | /* | |
2395 | * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're | |
2396 | * particularly interested in the aio/dio case. We use the rw_lock DLM lock | |
2397 | * to protect io on one node from truncation on another. | |
2398 | */ | |
2399 | static int ocfs2_dio_end_io(struct kiocb *iocb, | |
2400 | loff_t offset, | |
2401 | ssize_t bytes, | |
2402 | void *private) | |
2403 | { | |
2404 | struct inode *inode = file_inode(iocb->ki_filp); | |
2405 | int level; | |
08554955 | 2406 | int ret = 0; |
c15471f7 RD |
2407 | |
2408 | /* this io's submitter should not have unlocked this before we could */ | |
2409 | BUG_ON(!ocfs2_iocb_is_rw_locked(iocb)); | |
2410 | ||
5040f8df WW |
2411 | if (bytes <= 0) |
2412 | mlog_ratelimited(ML_ERROR, "Direct IO failed, bytes = %lld", | |
2413 | (long long)bytes); | |
2414 | if (private) { | |
2415 | if (bytes > 0) | |
2416 | ret = ocfs2_dio_end_io_write(inode, private, offset, | |
2417 | bytes); | |
2418 | else | |
2419 | ocfs2_dio_free_write_ctx(inode, private); | |
2420 | } | |
c15471f7 RD |
2421 | |
2422 | ocfs2_iocb_clear_rw_locked(iocb); | |
2423 | ||
2424 | level = ocfs2_iocb_rw_locked_level(iocb); | |
2425 | ocfs2_rw_unlock(inode, level); | |
08554955 | 2426 | return ret; |
c15471f7 RD |
2427 | } |
2428 | ||
c8b8e32d | 2429 | static ssize_t ocfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter) |
c15471f7 RD |
2430 | { |
2431 | struct file *file = iocb->ki_filp; | |
93c76a3d | 2432 | struct inode *inode = file->f_mapping->host; |
c15471f7 | 2433 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
c15471f7 RD |
2434 | get_block_t *get_block; |
2435 | ||
2436 | /* | |
2437 | * Fallback to buffered I/O if we see an inode without | |
2438 | * extents. | |
2439 | */ | |
2440 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) | |
2441 | return 0; | |
2442 | ||
2443 | /* Fallback to buffered I/O if we do not support append dio. */ | |
c8b8e32d CH |
2444 | if (iocb->ki_pos + iter->count > i_size_read(inode) && |
2445 | !ocfs2_supports_append_dio(osb)) | |
c15471f7 RD |
2446 | return 0; |
2447 | ||
2448 | if (iov_iter_rw(iter) == READ) | |
3e4c56d4 | 2449 | get_block = ocfs2_lock_get_block; |
c15471f7 | 2450 | else |
3e4c56d4 | 2451 | get_block = ocfs2_dio_wr_get_block; |
c15471f7 RD |
2452 | |
2453 | return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, | |
c8b8e32d | 2454 | iter, get_block, |
c15471f7 RD |
2455 | ocfs2_dio_end_io, NULL, 0); |
2456 | } | |
2457 | ||
f5e54d6e | 2458 | const struct address_space_operations ocfs2_aops = { |
1fca3a05 | 2459 | .readpage = ocfs2_readpage, |
d4388340 | 2460 | .readahead = ocfs2_readahead, |
1fca3a05 HH |
2461 | .writepage = ocfs2_writepage, |
2462 | .write_begin = ocfs2_write_begin, | |
2463 | .write_end = ocfs2_write_end, | |
2464 | .bmap = ocfs2_bmap, | |
1fca3a05 | 2465 | .direct_IO = ocfs2_direct_IO, |
41ecc345 | 2466 | .invalidatepage = block_invalidatepage, |
1fca3a05 HH |
2467 | .releasepage = ocfs2_releasepage, |
2468 | .migratepage = buffer_migrate_page, | |
2469 | .is_partially_uptodate = block_is_partially_uptodate, | |
aa261f54 | 2470 | .error_remove_page = generic_error_remove_page, |
ccd979bd | 2471 | }; |