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Commit | Line | Data |
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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
7ae8fa84 | 3 | * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
4 | * |
5 | * This copyrighted material is made available to anyone wishing to use, | |
6 | * modify, copy, or redistribute it subject to the terms and conditions | |
e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
b3b94faa DT |
8 | */ |
9 | ||
10 | #include <linux/sched.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/completion.h> | |
14 | #include <linux/buffer_head.h> | |
15 | #include <linux/pagemap.h> | |
fd88de56 | 16 | #include <linux/pagevec.h> |
9b124fbb | 17 | #include <linux/mpage.h> |
d1665e41 | 18 | #include <linux/fs.h> |
a8d638e3 | 19 | #include <linux/writeback.h> |
5c676f6d | 20 | #include <linux/gfs2_ondisk.h> |
7d308590 | 21 | #include <linux/lm_interface.h> |
b3b94faa DT |
22 | |
23 | #include "gfs2.h" | |
5c676f6d | 24 | #include "incore.h" |
b3b94faa DT |
25 | #include "bmap.h" |
26 | #include "glock.h" | |
27 | #include "inode.h" | |
b3b94faa DT |
28 | #include "log.h" |
29 | #include "meta_io.h" | |
30 | #include "ops_address.h" | |
b3b94faa DT |
31 | #include "quota.h" |
32 | #include "trans.h" | |
18ec7d5c | 33 | #include "rgrp.h" |
61a30dcb | 34 | #include "ops_file.h" |
5c676f6d | 35 | #include "util.h" |
4340fe62 | 36 | #include "glops.h" |
b3b94faa | 37 | |
ba7f7290 SW |
38 | |
39 | static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page, | |
40 | unsigned int from, unsigned int to) | |
41 | { | |
42 | struct buffer_head *head = page_buffers(page); | |
43 | unsigned int bsize = head->b_size; | |
44 | struct buffer_head *bh; | |
45 | unsigned int start, end; | |
46 | ||
47 | for (bh = head, start = 0; bh != head || !start; | |
48 | bh = bh->b_this_page, start = end) { | |
49 | end = start + bsize; | |
50 | if (end <= from || start >= to) | |
51 | continue; | |
52 | gfs2_trans_add_bh(ip->i_gl, bh, 0); | |
53 | } | |
54 | } | |
55 | ||
b3b94faa | 56 | /** |
4ff14670 | 57 | * gfs2_get_block - Fills in a buffer head with details about a block |
b3b94faa DT |
58 | * @inode: The inode |
59 | * @lblock: The block number to look up | |
60 | * @bh_result: The buffer head to return the result in | |
61 | * @create: Non-zero if we may add block to the file | |
62 | * | |
63 | * Returns: errno | |
64 | */ | |
65 | ||
4ff14670 SW |
66 | int gfs2_get_block(struct inode *inode, sector_t lblock, |
67 | struct buffer_head *bh_result, int create) | |
b3b94faa | 68 | { |
23591256 | 69 | return gfs2_block_map(inode, lblock, create, bh_result); |
b3b94faa DT |
70 | } |
71 | ||
72 | /** | |
7a6bbacb | 73 | * gfs2_get_block_noalloc - Fills in a buffer head with details about a block |
b3b94faa DT |
74 | * @inode: The inode |
75 | * @lblock: The block number to look up | |
76 | * @bh_result: The buffer head to return the result in | |
77 | * @create: Non-zero if we may add block to the file | |
78 | * | |
79 | * Returns: errno | |
80 | */ | |
81 | ||
7a6bbacb SW |
82 | static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock, |
83 | struct buffer_head *bh_result, int create) | |
b3b94faa | 84 | { |
b3b94faa DT |
85 | int error; |
86 | ||
23591256 | 87 | error = gfs2_block_map(inode, lblock, 0, bh_result); |
b3b94faa DT |
88 | if (error) |
89 | return error; | |
7a6bbacb SW |
90 | if (bh_result->b_blocknr == 0) |
91 | return -EIO; | |
92 | return 0; | |
b3b94faa DT |
93 | } |
94 | ||
7a6bbacb SW |
95 | static int gfs2_get_block_direct(struct inode *inode, sector_t lblock, |
96 | struct buffer_head *bh_result, int create) | |
623d9355 | 97 | { |
23591256 | 98 | return gfs2_block_map(inode, lblock, 0, bh_result); |
623d9355 | 99 | } |
7a6bbacb | 100 | |
b3b94faa DT |
101 | /** |
102 | * gfs2_writepage - Write complete page | |
103 | * @page: Page to write | |
104 | * | |
105 | * Returns: errno | |
106 | * | |
18ec7d5c SW |
107 | * Some of this is copied from block_write_full_page() although we still |
108 | * call it to do most of the work. | |
b3b94faa DT |
109 | */ |
110 | ||
111 | static int gfs2_writepage(struct page *page, struct writeback_control *wbc) | |
112 | { | |
18ec7d5c | 113 | struct inode *inode = page->mapping->host; |
f4387149 SW |
114 | struct gfs2_inode *ip = GFS2_I(inode); |
115 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
18ec7d5c SW |
116 | loff_t i_size = i_size_read(inode); |
117 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
118 | unsigned offset; | |
b3b94faa | 119 | int error; |
18ec7d5c | 120 | int done_trans = 0; |
b3b94faa | 121 | |
b3b94faa DT |
122 | if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) { |
123 | unlock_page(page); | |
124 | return -EIO; | |
125 | } | |
5c676f6d | 126 | if (current->journal_info) |
18ec7d5c SW |
127 | goto out_ignore; |
128 | ||
129 | /* Is the page fully outside i_size? (truncate in progress) */ | |
130 | offset = i_size & (PAGE_CACHE_SIZE-1); | |
d2d7b8a2 | 131 | if (page->index > end_index || (page->index == end_index && !offset)) { |
18ec7d5c | 132 | page->mapping->a_ops->invalidatepage(page, 0); |
b3b94faa | 133 | unlock_page(page); |
18ec7d5c | 134 | return 0; /* don't care */ |
b3b94faa DT |
135 | } |
136 | ||
18ec7d5c SW |
137 | if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip)) { |
138 | error = gfs2_trans_begin(sdp, RES_DINODE + 1, 0); | |
139 | if (error) | |
140 | goto out_ignore; | |
f4387149 SW |
141 | if (!page_has_buffers(page)) { |
142 | create_empty_buffers(page, inode->i_sb->s_blocksize, | |
143 | (1 << BH_Dirty)|(1 << BH_Uptodate)); | |
144 | } | |
18ec7d5c SW |
145 | gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1); |
146 | done_trans = 1; | |
147 | } | |
7a6bbacb | 148 | error = block_write_full_page(page, gfs2_get_block_noalloc, wbc); |
18ec7d5c SW |
149 | if (done_trans) |
150 | gfs2_trans_end(sdp); | |
b3b94faa | 151 | gfs2_meta_cache_flush(ip); |
b3b94faa | 152 | return error; |
18ec7d5c SW |
153 | |
154 | out_ignore: | |
155 | redirty_page_for_writepage(wbc, page); | |
156 | unlock_page(page); | |
157 | return 0; | |
b3b94faa DT |
158 | } |
159 | ||
a8d638e3 SW |
160 | /** |
161 | * gfs2_writepages - Write a bunch of dirty pages back to disk | |
162 | * @mapping: The mapping to write | |
163 | * @wbc: Write-back control | |
164 | * | |
165 | * For journaled files and/or ordered writes this just falls back to the | |
166 | * kernel's default writepages path for now. We will probably want to change | |
167 | * that eventually (i.e. when we look at allocate on flush). | |
168 | * | |
169 | * For the data=writeback case though we can already ignore buffer heads | |
170 | * and write whole extents at once. This is a big reduction in the | |
171 | * number of I/O requests we send and the bmap calls we make in this case. | |
172 | */ | |
a2cf8222 AB |
173 | static int gfs2_writepages(struct address_space *mapping, |
174 | struct writeback_control *wbc) | |
a8d638e3 SW |
175 | { |
176 | struct inode *inode = mapping->host; | |
177 | struct gfs2_inode *ip = GFS2_I(inode); | |
178 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
179 | ||
180 | if (sdp->sd_args.ar_data == GFS2_DATA_WRITEBACK && !gfs2_is_jdata(ip)) | |
181 | return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc); | |
182 | ||
183 | return generic_writepages(mapping, wbc); | |
184 | } | |
185 | ||
b3b94faa DT |
186 | /** |
187 | * stuffed_readpage - Fill in a Linux page with stuffed file data | |
188 | * @ip: the inode | |
189 | * @page: the page | |
190 | * | |
191 | * Returns: errno | |
192 | */ | |
193 | ||
194 | static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) | |
195 | { | |
196 | struct buffer_head *dibh; | |
197 | void *kaddr; | |
198 | int error; | |
199 | ||
bf126aee SW |
200 | /* |
201 | * Due to the order of unstuffing files and ->nopage(), we can be | |
202 | * asked for a zero page in the case of a stuffed file being extended, | |
203 | * so we need to supply one here. It doesn't happen often. | |
204 | */ | |
205 | if (unlikely(page->index)) { | |
206 | kaddr = kmap_atomic(page, KM_USER0); | |
207 | memset(kaddr, 0, PAGE_CACHE_SIZE); | |
208 | kunmap_atomic(kaddr, KM_USER0); | |
209 | flush_dcache_page(page); | |
210 | SetPageUptodate(page); | |
211 | return 0; | |
212 | } | |
fd88de56 | 213 | |
b3b94faa DT |
214 | error = gfs2_meta_inode_buffer(ip, &dibh); |
215 | if (error) | |
216 | return error; | |
217 | ||
5c4e9e03 | 218 | kaddr = kmap_atomic(page, KM_USER0); |
fd88de56 | 219 | memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), |
b3b94faa | 220 | ip->i_di.di_size); |
fd88de56 | 221 | memset(kaddr + ip->i_di.di_size, 0, PAGE_CACHE_SIZE - ip->i_di.di_size); |
c312c4fd | 222 | kunmap_atomic(kaddr, KM_USER0); |
bf126aee | 223 | flush_dcache_page(page); |
b3b94faa | 224 | brelse(dibh); |
b3b94faa DT |
225 | SetPageUptodate(page); |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
b3b94faa | 230 | |
b3b94faa DT |
231 | /** |
232 | * gfs2_readpage - readpage with locking | |
18ec7d5c SW |
233 | * @file: The file to read a page for. N.B. This may be NULL if we are |
234 | * reading an internal file. | |
b3b94faa DT |
235 | * @page: The page to read |
236 | * | |
237 | * Returns: errno | |
238 | */ | |
239 | ||
240 | static int gfs2_readpage(struct file *file, struct page *page) | |
241 | { | |
feaa7bba SW |
242 | struct gfs2_inode *ip = GFS2_I(page->mapping->host); |
243 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); | |
dc41aeed | 244 | struct gfs2_file *gf = NULL; |
18ec7d5c | 245 | struct gfs2_holder gh; |
b3b94faa | 246 | int error; |
59a1cc6b | 247 | int do_unlock = 0; |
b3b94faa | 248 | |
dd538c83 | 249 | if (likely(file != &gfs2_internal_file_sentinel)) { |
59a1cc6b | 250 | if (file) { |
dc41aeed | 251 | gf = file->private_data; |
59a1cc6b | 252 | if (test_bit(GFF_EXLOCK, &gf->f_flags)) |
dc41aeed | 253 | /* gfs2_sharewrite_nopage has grabbed the ip->i_gl already */ |
59a1cc6b SW |
254 | goto skip_lock; |
255 | } | |
2ca99501 | 256 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME|LM_FLAG_TRY_1CB, &gh); |
59a1cc6b | 257 | do_unlock = 1; |
dcd24799 | 258 | error = gfs2_glock_nq_atime(&gh); |
fd88de56 | 259 | if (unlikely(error)) |
61a30dcb SW |
260 | goto out_unlock; |
261 | } | |
b3b94faa | 262 | |
59a1cc6b | 263 | skip_lock: |
18ec7d5c | 264 | if (gfs2_is_stuffed(ip)) { |
fd88de56 SW |
265 | error = stuffed_readpage(ip, page); |
266 | unlock_page(page); | |
b3b94faa | 267 | } else |
18ec7d5c | 268 | error = mpage_readpage(page, gfs2_get_block); |
b3b94faa DT |
269 | |
270 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
271 | error = -EIO; | |
272 | ||
07903c02 | 273 | if (do_unlock) { |
61a30dcb SW |
274 | gfs2_glock_dq_m(1, &gh); |
275 | gfs2_holder_uninit(&gh); | |
276 | } | |
18ec7d5c | 277 | out: |
b3b94faa | 278 | return error; |
18ec7d5c SW |
279 | out_unlock: |
280 | unlock_page(page); | |
a13cbe37 JW |
281 | if (error == GLR_TRYFAILED) { |
282 | error = AOP_TRUNCATED_PAGE; | |
283 | yield(); | |
284 | } | |
59a1cc6b | 285 | if (do_unlock) |
fd88de56 SW |
286 | gfs2_holder_uninit(&gh); |
287 | goto out; | |
288 | } | |
289 | ||
fd88de56 SW |
290 | /** |
291 | * gfs2_readpages - Read a bunch of pages at once | |
292 | * | |
293 | * Some notes: | |
294 | * 1. This is only for readahead, so we can simply ignore any things | |
295 | * which are slightly inconvenient (such as locking conflicts between | |
296 | * the page lock and the glock) and return having done no I/O. Its | |
297 | * obviously not something we'd want to do on too regular a basis. | |
298 | * Any I/O we ignore at this time will be done via readpage later. | |
e1d5b18a | 299 | * 2. We don't handle stuffed files here we let readpage do the honours. |
fd88de56 SW |
300 | * 3. mpage_readpages() does most of the heavy lifting in the common case. |
301 | * 4. gfs2_get_block() is relied upon to set BH_Boundary in the right places. | |
302 | * 5. We use LM_FLAG_TRY_1CB here, effectively we then have lock-ahead as | |
303 | * well as read-ahead. | |
304 | */ | |
305 | static int gfs2_readpages(struct file *file, struct address_space *mapping, | |
306 | struct list_head *pages, unsigned nr_pages) | |
307 | { | |
308 | struct inode *inode = mapping->host; | |
feaa7bba SW |
309 | struct gfs2_inode *ip = GFS2_I(inode); |
310 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
fd88de56 | 311 | struct gfs2_holder gh; |
e1d5b18a | 312 | int ret = 0; |
59a1cc6b | 313 | int do_unlock = 0; |
fd88de56 | 314 | |
dd538c83 | 315 | if (likely(file != &gfs2_internal_file_sentinel)) { |
59a1cc6b SW |
316 | if (file) { |
317 | struct gfs2_file *gf = file->private_data; | |
318 | if (test_bit(GFF_EXLOCK, &gf->f_flags)) | |
319 | goto skip_lock; | |
320 | } | |
fd88de56 | 321 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, |
2ca99501 | 322 | LM_FLAG_TRY_1CB|GL_ATIME, &gh); |
59a1cc6b | 323 | do_unlock = 1; |
dcd24799 | 324 | ret = gfs2_glock_nq_atime(&gh); |
907b9bce | 325 | if (ret == GLR_TRYFAILED) |
fd88de56 SW |
326 | goto out_noerror; |
327 | if (unlikely(ret)) | |
328 | goto out_unlock; | |
329 | } | |
59a1cc6b | 330 | skip_lock: |
e1d5b18a | 331 | if (!gfs2_is_stuffed(ip)) |
fd88de56 | 332 | ret = mpage_readpages(mapping, pages, nr_pages, gfs2_get_block); |
fd88de56 | 333 | |
59a1cc6b | 334 | if (do_unlock) { |
fd88de56 SW |
335 | gfs2_glock_dq_m(1, &gh); |
336 | gfs2_holder_uninit(&gh); | |
337 | } | |
338 | out: | |
339 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
340 | ret = -EIO; | |
341 | return ret; | |
342 | out_noerror: | |
343 | ret = 0; | |
344 | out_unlock: | |
59a1cc6b | 345 | if (do_unlock) |
fd88de56 | 346 | gfs2_holder_uninit(&gh); |
18ec7d5c | 347 | goto out; |
b3b94faa DT |
348 | } |
349 | ||
350 | /** | |
351 | * gfs2_prepare_write - Prepare to write a page to a file | |
352 | * @file: The file to write to | |
353 | * @page: The page which is to be prepared for writing | |
354 | * @from: From (byte range within page) | |
355 | * @to: To (byte range within page) | |
356 | * | |
357 | * Returns: errno | |
358 | */ | |
359 | ||
360 | static int gfs2_prepare_write(struct file *file, struct page *page, | |
361 | unsigned from, unsigned to) | |
362 | { | |
feaa7bba SW |
363 | struct gfs2_inode *ip = GFS2_I(page->mapping->host); |
364 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); | |
18ec7d5c SW |
365 | unsigned int data_blocks, ind_blocks, rblocks; |
366 | int alloc_required; | |
b3b94faa | 367 | int error = 0; |
18ec7d5c SW |
368 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + from; |
369 | loff_t end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
370 | struct gfs2_alloc *al; | |
52ae7b79 RC |
371 | unsigned int write_len = to - from; |
372 | ||
b3b94faa | 373 | |
2ca99501 | 374 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME|LM_FLAG_TRY_1CB, &ip->i_gh); |
dcd24799 | 375 | error = gfs2_glock_nq_atime(&ip->i_gh); |
2ca99501 | 376 | if (unlikely(error)) { |
2d72e710 SW |
377 | if (error == GLR_TRYFAILED) { |
378 | unlock_page(page); | |
2ca99501 | 379 | error = AOP_TRUNCATED_PAGE; |
a13cbe37 | 380 | yield(); |
2d72e710 | 381 | } |
18ec7d5c | 382 | goto out_uninit; |
2ca99501 | 383 | } |
b3b94faa | 384 | |
52ae7b79 | 385 | gfs2_write_calc_reserv(ip, write_len, &data_blocks, &ind_blocks); |
18ec7d5c | 386 | |
52ae7b79 | 387 | error = gfs2_write_alloc_required(ip, pos, write_len, &alloc_required); |
18ec7d5c SW |
388 | if (error) |
389 | goto out_unlock; | |
b3b94faa | 390 | |
18ec7d5c | 391 | |
f5c54804 | 392 | ip->i_alloc.al_requested = 0; |
18ec7d5c SW |
393 | if (alloc_required) { |
394 | al = gfs2_alloc_get(ip); | |
395 | ||
396 | error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
397 | if (error) | |
398 | goto out_alloc_put; | |
399 | ||
2933f925 | 400 | error = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid); |
18ec7d5c SW |
401 | if (error) |
402 | goto out_qunlock; | |
403 | ||
404 | al->al_requested = data_blocks + ind_blocks; | |
405 | error = gfs2_inplace_reserve(ip); | |
406 | if (error) | |
407 | goto out_qunlock; | |
408 | } | |
409 | ||
410 | rblocks = RES_DINODE + ind_blocks; | |
411 | if (gfs2_is_jdata(ip)) | |
412 | rblocks += data_blocks ? data_blocks : 1; | |
413 | if (ind_blocks || data_blocks) | |
414 | rblocks += RES_STATFS + RES_QUOTA; | |
415 | ||
416 | error = gfs2_trans_begin(sdp, rblocks, 0); | |
417 | if (error) | |
418 | goto out; | |
419 | ||
420 | if (gfs2_is_stuffed(ip)) { | |
421 | if (end > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { | |
f25ef0c1 | 422 | error = gfs2_unstuff_dinode(ip, page); |
5c4e9e03 SW |
423 | if (error == 0) |
424 | goto prepare_write; | |
425 | } else if (!PageUptodate(page)) | |
b3b94faa | 426 | error = stuffed_readpage(ip, page); |
5c4e9e03 | 427 | goto out; |
18ec7d5c SW |
428 | } |
429 | ||
5c4e9e03 | 430 | prepare_write: |
18ec7d5c SW |
431 | error = block_prepare_write(page, from, to, gfs2_get_block); |
432 | ||
433 | out: | |
434 | if (error) { | |
435 | gfs2_trans_end(sdp); | |
436 | if (alloc_required) { | |
437 | gfs2_inplace_release(ip); | |
438 | out_qunlock: | |
439 | gfs2_quota_unlock(ip); | |
440 | out_alloc_put: | |
441 | gfs2_alloc_put(ip); | |
442 | } | |
443 | out_unlock: | |
444 | gfs2_glock_dq_m(1, &ip->i_gh); | |
445 | out_uninit: | |
446 | gfs2_holder_uninit(&ip->i_gh); | |
447 | } | |
b3b94faa DT |
448 | |
449 | return error; | |
450 | } | |
451 | ||
7ae8fa84 RP |
452 | /** |
453 | * adjust_fs_space - Adjusts the free space available due to gfs2_grow | |
454 | * @inode: the rindex inode | |
455 | */ | |
456 | static void adjust_fs_space(struct inode *inode) | |
457 | { | |
458 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; | |
459 | struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; | |
460 | struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; | |
461 | u64 fs_total, new_free; | |
462 | ||
463 | /* Total up the file system space, according to the latest rindex. */ | |
464 | fs_total = gfs2_ri_total(sdp); | |
465 | ||
466 | spin_lock(&sdp->sd_statfs_spin); | |
467 | if (fs_total > (m_sc->sc_total + l_sc->sc_total)) | |
468 | new_free = fs_total - (m_sc->sc_total + l_sc->sc_total); | |
469 | else | |
470 | new_free = 0; | |
471 | spin_unlock(&sdp->sd_statfs_spin); | |
6c53267f RP |
472 | fs_warn(sdp, "File system extended by %llu blocks.\n", |
473 | (unsigned long long)new_free); | |
7ae8fa84 RP |
474 | gfs2_statfs_change(sdp, new_free, new_free, 0); |
475 | } | |
476 | ||
b3b94faa DT |
477 | /** |
478 | * gfs2_commit_write - Commit write to a file | |
479 | * @file: The file to write to | |
480 | * @page: The page containing the data | |
481 | * @from: From (byte range within page) | |
482 | * @to: To (byte range within page) | |
483 | * | |
484 | * Returns: errno | |
485 | */ | |
486 | ||
487 | static int gfs2_commit_write(struct file *file, struct page *page, | |
488 | unsigned from, unsigned to) | |
489 | { | |
490 | struct inode *inode = page->mapping->host; | |
feaa7bba SW |
491 | struct gfs2_inode *ip = GFS2_I(inode); |
492 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
18ec7d5c SW |
493 | int error = -EOPNOTSUPP; |
494 | struct buffer_head *dibh; | |
48516ced SW |
495 | struct gfs2_alloc *al = &ip->i_alloc; |
496 | struct gfs2_dinode *di; | |
b3b94faa | 497 | |
18ec7d5c SW |
498 | if (gfs2_assert_withdraw(sdp, gfs2_glock_is_locked_by_me(ip->i_gl))) |
499 | goto fail_nounlock; | |
500 | ||
501 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
502 | if (error) | |
503 | goto fail_endtrans; | |
504 | ||
505 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); | |
48516ced | 506 | di = (struct gfs2_dinode *)dibh->b_data; |
18ec7d5c | 507 | |
b3b94faa | 508 | if (gfs2_is_stuffed(ip)) { |
cd915493 | 509 | u64 file_size; |
b3b94faa DT |
510 | void *kaddr; |
511 | ||
cd915493 | 512 | file_size = ((u64)page->index << PAGE_CACHE_SHIFT) + to; |
b3b94faa | 513 | |
18ec7d5c | 514 | kaddr = kmap_atomic(page, KM_USER0); |
b3b94faa | 515 | memcpy(dibh->b_data + sizeof(struct gfs2_dinode) + from, |
0bd5996a | 516 | kaddr + from, to - from); |
c312c4fd | 517 | kunmap_atomic(kaddr, KM_USER0); |
b3b94faa DT |
518 | |
519 | SetPageUptodate(page); | |
520 | ||
ae619320 | 521 | if (inode->i_size < file_size) { |
b3b94faa | 522 | i_size_write(inode, file_size); |
ae619320 SW |
523 | mark_inode_dirty(inode); |
524 | } | |
b3b94faa | 525 | } else { |
568f4c96 SW |
526 | if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || |
527 | gfs2_is_jdata(ip)) | |
257f9b4e | 528 | gfs2_page_add_databufs(ip, page, from, to); |
b3b94faa DT |
529 | error = generic_commit_write(file, page, from, to); |
530 | if (error) | |
531 | goto fail; | |
532 | } | |
533 | ||
48516ced | 534 | if (ip->i_di.di_size < inode->i_size) { |
18ec7d5c | 535 | ip->i_di.di_size = inode->i_size; |
48516ced SW |
536 | di->di_size = cpu_to_be64(inode->i_size); |
537 | } | |
538 | ||
7ae8fa84 RP |
539 | if (inode == sdp->sd_rindex) |
540 | adjust_fs_space(inode); | |
541 | ||
18ec7d5c SW |
542 | brelse(dibh); |
543 | gfs2_trans_end(sdp); | |
544 | if (al->al_requested) { | |
545 | gfs2_inplace_release(ip); | |
546 | gfs2_quota_unlock(ip); | |
547 | gfs2_alloc_put(ip); | |
548 | } | |
1de91390 | 549 | unlock_page(page); |
18ec7d5c | 550 | gfs2_glock_dq_m(1, &ip->i_gh); |
1de91390 | 551 | lock_page(page); |
18ec7d5c | 552 | gfs2_holder_uninit(&ip->i_gh); |
b3b94faa DT |
553 | return 0; |
554 | ||
18ec7d5c SW |
555 | fail: |
556 | brelse(dibh); | |
557 | fail_endtrans: | |
558 | gfs2_trans_end(sdp); | |
559 | if (al->al_requested) { | |
560 | gfs2_inplace_release(ip); | |
561 | gfs2_quota_unlock(ip); | |
562 | gfs2_alloc_put(ip); | |
563 | } | |
1de91390 | 564 | unlock_page(page); |
18ec7d5c | 565 | gfs2_glock_dq_m(1, &ip->i_gh); |
1de91390 | 566 | lock_page(page); |
18ec7d5c SW |
567 | gfs2_holder_uninit(&ip->i_gh); |
568 | fail_nounlock: | |
b3b94faa | 569 | ClearPageUptodate(page); |
b3b94faa DT |
570 | return error; |
571 | } | |
572 | ||
573 | /** | |
574 | * gfs2_bmap - Block map function | |
575 | * @mapping: Address space info | |
576 | * @lblock: The block to map | |
577 | * | |
578 | * Returns: The disk address for the block or 0 on hole or error | |
579 | */ | |
580 | ||
581 | static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) | |
582 | { | |
feaa7bba | 583 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
b3b94faa DT |
584 | struct gfs2_holder i_gh; |
585 | sector_t dblock = 0; | |
586 | int error; | |
587 | ||
b3b94faa DT |
588 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
589 | if (error) | |
590 | return 0; | |
591 | ||
592 | if (!gfs2_is_stuffed(ip)) | |
4ff14670 | 593 | dblock = generic_block_bmap(mapping, lblock, gfs2_get_block); |
b3b94faa DT |
594 | |
595 | gfs2_glock_dq_uninit(&i_gh); | |
596 | ||
597 | return dblock; | |
598 | } | |
599 | ||
600 | static void discard_buffer(struct gfs2_sbd *sdp, struct buffer_head *bh) | |
601 | { | |
64fb4eb7 | 602 | struct gfs2_bufdata *bd; |
b3b94faa DT |
603 | |
604 | gfs2_log_lock(sdp); | |
5c676f6d | 605 | bd = bh->b_private; |
64fb4eb7 SW |
606 | if (bd) { |
607 | bd->bd_bh = NULL; | |
5c676f6d | 608 | bh->b_private = NULL; |
15d00c0b SW |
609 | } |
610 | gfs2_log_unlock(sdp); | |
b3b94faa DT |
611 | |
612 | lock_buffer(bh); | |
613 | clear_buffer_dirty(bh); | |
614 | bh->b_bdev = NULL; | |
615 | clear_buffer_mapped(bh); | |
616 | clear_buffer_req(bh); | |
617 | clear_buffer_new(bh); | |
618 | clear_buffer_delay(bh); | |
619 | unlock_buffer(bh); | |
620 | } | |
621 | ||
8628de05 | 622 | static void gfs2_invalidatepage(struct page *page, unsigned long offset) |
b3b94faa | 623 | { |
15d00c0b | 624 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); |
b3b94faa DT |
625 | struct buffer_head *head, *bh, *next; |
626 | unsigned int curr_off = 0; | |
b3b94faa DT |
627 | |
628 | BUG_ON(!PageLocked(page)); | |
629 | if (!page_has_buffers(page)) | |
8628de05 | 630 | return; |
b3b94faa DT |
631 | |
632 | bh = head = page_buffers(page); | |
633 | do { | |
634 | unsigned int next_off = curr_off + bh->b_size; | |
635 | next = bh->b_this_page; | |
636 | ||
637 | if (offset <= curr_off) | |
638 | discard_buffer(sdp, bh); | |
639 | ||
640 | curr_off = next_off; | |
641 | bh = next; | |
642 | } while (bh != head); | |
643 | ||
644 | if (!offset) | |
8628de05 | 645 | try_to_release_page(page, 0); |
b3b94faa | 646 | |
8628de05 | 647 | return; |
b3b94faa DT |
648 | } |
649 | ||
c7b33834 SW |
650 | /** |
651 | * gfs2_ok_for_dio - check that dio is valid on this file | |
652 | * @ip: The inode | |
653 | * @rw: READ or WRITE | |
654 | * @offset: The offset at which we are reading or writing | |
655 | * | |
656 | * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o) | |
657 | * 1 (to accept the i/o request) | |
658 | */ | |
659 | static int gfs2_ok_for_dio(struct gfs2_inode *ip, int rw, loff_t offset) | |
660 | { | |
661 | /* | |
662 | * Should we return an error here? I can't see that O_DIRECT for | |
663 | * a journaled file makes any sense. For now we'll silently fall | |
664 | * back to buffered I/O, likewise we do the same for stuffed | |
665 | * files since they are (a) small and (b) unaligned. | |
666 | */ | |
667 | if (gfs2_is_jdata(ip)) | |
668 | return 0; | |
669 | ||
670 | if (gfs2_is_stuffed(ip)) | |
671 | return 0; | |
672 | ||
673 | if (offset > i_size_read(&ip->i_inode)) | |
674 | return 0; | |
675 | return 1; | |
676 | } | |
677 | ||
678 | ||
679 | ||
a9e5f4d0 SW |
680 | static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb, |
681 | const struct iovec *iov, loff_t offset, | |
682 | unsigned long nr_segs) | |
d1665e41 SW |
683 | { |
684 | struct file *file = iocb->ki_filp; | |
685 | struct inode *inode = file->f_mapping->host; | |
feaa7bba | 686 | struct gfs2_inode *ip = GFS2_I(inode); |
d1665e41 SW |
687 | struct gfs2_holder gh; |
688 | int rv; | |
689 | ||
690 | /* | |
c7b33834 SW |
691 | * Deferred lock, even if its a write, since we do no allocation |
692 | * on this path. All we need change is atime, and this lock mode | |
693 | * ensures that other nodes have flushed their buffered read caches | |
694 | * (i.e. their page cache entries for this inode). We do not, | |
695 | * unfortunately have the option of only flushing a range like | |
696 | * the VFS does. | |
d1665e41 | 697 | */ |
c7b33834 | 698 | gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, GL_ATIME, &gh); |
dcd24799 | 699 | rv = gfs2_glock_nq_atime(&gh); |
d1665e41 | 700 | if (rv) |
c7b33834 SW |
701 | return rv; |
702 | rv = gfs2_ok_for_dio(ip, rw, offset); | |
703 | if (rv != 1) | |
704 | goto out; /* dio not valid, fall back to buffered i/o */ | |
705 | ||
706 | rv = blockdev_direct_IO_no_locking(rw, iocb, inode, inode->i_sb->s_bdev, | |
707 | iov, offset, nr_segs, | |
708 | gfs2_get_block_direct, NULL); | |
d1665e41 SW |
709 | out: |
710 | gfs2_glock_dq_m(1, &gh); | |
711 | gfs2_holder_uninit(&gh); | |
d1665e41 SW |
712 | return rv; |
713 | } | |
714 | ||
4340fe62 SW |
715 | /** |
716 | * stuck_releasepage - We're stuck in gfs2_releasepage(). Print stuff out. | |
717 | * @bh: the buffer we're stuck on | |
718 | * | |
719 | */ | |
720 | ||
721 | static void stuck_releasepage(struct buffer_head *bh) | |
722 | { | |
723 | struct inode *inode = bh->b_page->mapping->host; | |
724 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; | |
725 | struct gfs2_bufdata *bd = bh->b_private; | |
726 | struct gfs2_glock *gl; | |
166afccd SW |
727 | static unsigned limit = 0; |
728 | ||
0bd5996a | 729 | if (limit > 3) |
166afccd | 730 | return; |
0bd5996a | 731 | limit++; |
4340fe62 SW |
732 | |
733 | fs_warn(sdp, "stuck in gfs2_releasepage() %p\n", inode); | |
734 | fs_warn(sdp, "blkno = %llu, bh->b_count = %d\n", | |
735 | (unsigned long long)bh->b_blocknr, atomic_read(&bh->b_count)); | |
736 | fs_warn(sdp, "pinned = %u\n", buffer_pinned(bh)); | |
737 | fs_warn(sdp, "bh->b_private = %s\n", (bd) ? "!NULL" : "NULL"); | |
738 | ||
739 | if (!bd) | |
740 | return; | |
741 | ||
742 | gl = bd->bd_gl; | |
743 | ||
907b9bce | 744 | fs_warn(sdp, "gl = (%u, %llu)\n", |
4340fe62 SW |
745 | gl->gl_name.ln_type, (unsigned long long)gl->gl_name.ln_number); |
746 | ||
747 | fs_warn(sdp, "bd_list_tr = %s, bd_le.le_list = %s\n", | |
748 | (list_empty(&bd->bd_list_tr)) ? "no" : "yes", | |
749 | (list_empty(&bd->bd_le.le_list)) ? "no" : "yes"); | |
750 | ||
751 | if (gl->gl_ops == &gfs2_inode_glops) { | |
752 | struct gfs2_inode *ip = gl->gl_object; | |
753 | unsigned int x; | |
754 | ||
755 | if (!ip) | |
756 | return; | |
757 | ||
758 | fs_warn(sdp, "ip = %llu %llu\n", | |
759 | (unsigned long long)ip->i_num.no_formal_ino, | |
760 | (unsigned long long)ip->i_num.no_addr); | |
761 | ||
762 | for (x = 0; x < GFS2_MAX_META_HEIGHT; x++) | |
763 | fs_warn(sdp, "ip->i_cache[%u] = %s\n", | |
764 | x, (ip->i_cache[x]) ? "!NULL" : "NULL"); | |
765 | } | |
766 | } | |
767 | ||
768 | /** | |
623d9355 | 769 | * gfs2_releasepage - free the metadata associated with a page |
4340fe62 SW |
770 | * @page: the page that's being released |
771 | * @gfp_mask: passed from Linux VFS, ignored by us | |
772 | * | |
773 | * Call try_to_free_buffers() if the buffers in this page can be | |
774 | * released. | |
775 | * | |
776 | * Returns: 0 | |
777 | */ | |
778 | ||
779 | int gfs2_releasepage(struct page *page, gfp_t gfp_mask) | |
780 | { | |
781 | struct inode *aspace = page->mapping->host; | |
782 | struct gfs2_sbd *sdp = aspace->i_sb->s_fs_info; | |
783 | struct buffer_head *bh, *head; | |
784 | struct gfs2_bufdata *bd; | |
166afccd | 785 | unsigned long t = jiffies + gfs2_tune_get(sdp, gt_stall_secs) * HZ; |
4340fe62 SW |
786 | |
787 | if (!page_has_buffers(page)) | |
788 | goto out; | |
789 | ||
790 | head = bh = page_buffers(page); | |
791 | do { | |
4340fe62 | 792 | while (atomic_read(&bh->b_count)) { |
166afccd SW |
793 | if (!atomic_read(&aspace->i_writecount)) |
794 | return 0; | |
795 | ||
61057c6b RC |
796 | if (!(gfp_mask & __GFP_WAIT)) |
797 | return 0; | |
798 | ||
166afccd SW |
799 | if (time_after_eq(jiffies, t)) { |
800 | stuck_releasepage(bh); | |
801 | /* should we withdraw here? */ | |
802 | return 0; | |
4340fe62 SW |
803 | } |
804 | ||
166afccd | 805 | yield(); |
4340fe62 SW |
806 | } |
807 | ||
808 | gfs2_assert_warn(sdp, !buffer_pinned(bh)); | |
623d9355 | 809 | gfs2_assert_warn(sdp, !buffer_dirty(bh)); |
4340fe62 | 810 | |
623d9355 | 811 | gfs2_log_lock(sdp); |
4340fe62 SW |
812 | bd = bh->b_private; |
813 | if (bd) { | |
814 | gfs2_assert_warn(sdp, bd->bd_bh == bh); | |
815 | gfs2_assert_warn(sdp, list_empty(&bd->bd_list_tr)); | |
4340fe62 | 816 | gfs2_assert_warn(sdp, !bd->bd_ail); |
623d9355 SW |
817 | bd->bd_bh = NULL; |
818 | if (!list_empty(&bd->bd_le.le_list)) | |
819 | bd = NULL; | |
4340fe62 SW |
820 | bh->b_private = NULL; |
821 | } | |
623d9355 SW |
822 | gfs2_log_unlock(sdp); |
823 | if (bd) | |
824 | kmem_cache_free(gfs2_bufdata_cachep, bd); | |
4340fe62 SW |
825 | |
826 | bh = bh->b_this_page; | |
166afccd | 827 | } while (bh != head); |
4340fe62 | 828 | |
a9e5f4d0 | 829 | out: |
4340fe62 SW |
830 | return try_to_free_buffers(page); |
831 | } | |
832 | ||
66de045d | 833 | const struct address_space_operations gfs2_file_aops = { |
b3b94faa | 834 | .writepage = gfs2_writepage, |
a8d638e3 | 835 | .writepages = gfs2_writepages, |
b3b94faa | 836 | .readpage = gfs2_readpage, |
fd88de56 | 837 | .readpages = gfs2_readpages, |
b3b94faa DT |
838 | .sync_page = block_sync_page, |
839 | .prepare_write = gfs2_prepare_write, | |
840 | .commit_write = gfs2_commit_write, | |
841 | .bmap = gfs2_bmap, | |
842 | .invalidatepage = gfs2_invalidatepage, | |
4340fe62 | 843 | .releasepage = gfs2_releasepage, |
b3b94faa DT |
844 | .direct_IO = gfs2_direct_IO, |
845 | }; | |
846 |