Commit | Line | Data |
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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3a8a9a10 | 3 | * Copyright (C) 2004-2006 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/mm.h> | |
16 | #include <linux/pagemap.h> | |
17 | #include <linux/writeback.h> | |
18 | #include <linux/swap.h> | |
19 | #include <linux/delay.h> | |
5c676f6d | 20 | #include <linux/gfs2_ondisk.h> |
b3b94faa DT |
21 | |
22 | #include "gfs2.h" | |
5c676f6d SW |
23 | #include "lm_interface.h" |
24 | #include "incore.h" | |
b3b94faa DT |
25 | #include "glock.h" |
26 | #include "glops.h" | |
27 | #include "inode.h" | |
28 | #include "log.h" | |
29 | #include "lops.h" | |
30 | #include "meta_io.h" | |
31 | #include "rgrp.h" | |
32 | #include "trans.h" | |
5c676f6d | 33 | #include "util.h" |
4340fe62 | 34 | #include "ops_address.h" |
b3b94faa DT |
35 | |
36 | #define buffer_busy(bh) \ | |
37 | ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned))) | |
38 | #define buffer_in_io(bh) \ | |
39 | ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock))) | |
40 | ||
41 | static int aspace_get_block(struct inode *inode, sector_t lblock, | |
42 | struct buffer_head *bh_result, int create) | |
43 | { | |
5c676f6d | 44 | gfs2_assert_warn(inode->i_sb->s_fs_info, 0); |
b3b94faa DT |
45 | return -EOPNOTSUPP; |
46 | } | |
47 | ||
48 | static int gfs2_aspace_writepage(struct page *page, | |
49 | struct writeback_control *wbc) | |
50 | { | |
51 | return block_write_full_page(page, aspace_get_block, wbc); | |
52 | } | |
53 | ||
66de045d | 54 | static const struct address_space_operations aspace_aops = { |
b3b94faa | 55 | .writepage = gfs2_aspace_writepage, |
4340fe62 | 56 | .releasepage = gfs2_releasepage, |
b3b94faa DT |
57 | }; |
58 | ||
59 | /** | |
60 | * gfs2_aspace_get - Create and initialize a struct inode structure | |
61 | * @sdp: the filesystem the aspace is in | |
62 | * | |
63 | * Right now a struct inode is just a struct inode. Maybe Linux | |
64 | * will supply a more lightweight address space construct (that works) | |
65 | * in the future. | |
66 | * | |
67 | * Make sure pages/buffers in this aspace aren't in high memory. | |
68 | * | |
69 | * Returns: the aspace | |
70 | */ | |
71 | ||
72 | struct inode *gfs2_aspace_get(struct gfs2_sbd *sdp) | |
73 | { | |
74 | struct inode *aspace; | |
75 | ||
76 | aspace = new_inode(sdp->sd_vfs); | |
77 | if (aspace) { | |
f3bba03f | 78 | mapping_set_gfp_mask(aspace->i_mapping, GFP_NOFS); |
b3b94faa DT |
79 | aspace->i_mapping->a_ops = &aspace_aops; |
80 | aspace->i_size = ~0ULL; | |
5c676f6d | 81 | aspace->u.generic_ip = NULL; |
b3b94faa DT |
82 | insert_inode_hash(aspace); |
83 | } | |
b3b94faa DT |
84 | return aspace; |
85 | } | |
86 | ||
87 | void gfs2_aspace_put(struct inode *aspace) | |
88 | { | |
89 | remove_inode_hash(aspace); | |
90 | iput(aspace); | |
91 | } | |
92 | ||
93 | /** | |
94 | * gfs2_ail1_start_one - Start I/O on a part of the AIL | |
95 | * @sdp: the filesystem | |
96 | * @tr: the part of the AIL | |
97 | * | |
98 | */ | |
99 | ||
100 | void gfs2_ail1_start_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai) | |
101 | { | |
102 | struct gfs2_bufdata *bd, *s; | |
103 | struct buffer_head *bh; | |
104 | int retry; | |
105 | ||
190562bd SW |
106 | BUG_ON(!spin_is_locked(&sdp->sd_log_lock)); |
107 | ||
b3b94faa DT |
108 | do { |
109 | retry = 0; | |
110 | ||
111 | list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, | |
112 | bd_ail_st_list) { | |
113 | bh = bd->bd_bh; | |
114 | ||
115 | gfs2_assert(sdp, bd->bd_ail == ai); | |
116 | ||
117 | if (!buffer_busy(bh)) { | |
1b50259b SW |
118 | if (!buffer_uptodate(bh)) { |
119 | gfs2_log_unlock(sdp); | |
b3b94faa | 120 | gfs2_io_error_bh(sdp, bh); |
1b50259b SW |
121 | gfs2_log_lock(sdp); |
122 | } | |
b3b94faa DT |
123 | list_move(&bd->bd_ail_st_list, |
124 | &ai->ai_ail2_list); | |
125 | continue; | |
126 | } | |
127 | ||
128 | if (!buffer_dirty(bh)) | |
129 | continue; | |
130 | ||
131 | list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list); | |
132 | ||
133 | gfs2_log_unlock(sdp); | |
134 | wait_on_buffer(bh); | |
135 | ll_rw_block(WRITE, 1, &bh); | |
136 | gfs2_log_lock(sdp); | |
137 | ||
138 | retry = 1; | |
139 | break; | |
140 | } | |
141 | } while (retry); | |
142 | } | |
143 | ||
144 | /** | |
145 | * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced | |
146 | * @sdp: the filesystem | |
147 | * @ai: the AIL entry | |
148 | * | |
149 | */ | |
150 | ||
151 | int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai, int flags) | |
152 | { | |
153 | struct gfs2_bufdata *bd, *s; | |
154 | struct buffer_head *bh; | |
155 | ||
156 | list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, | |
157 | bd_ail_st_list) { | |
158 | bh = bd->bd_bh; | |
159 | ||
160 | gfs2_assert(sdp, bd->bd_ail == ai); | |
161 | ||
162 | if (buffer_busy(bh)) { | |
163 | if (flags & DIO_ALL) | |
164 | continue; | |
165 | else | |
166 | break; | |
167 | } | |
168 | ||
169 | if (!buffer_uptodate(bh)) | |
170 | gfs2_io_error_bh(sdp, bh); | |
171 | ||
172 | list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list); | |
173 | } | |
174 | ||
175 | return list_empty(&ai->ai_ail1_list); | |
176 | } | |
177 | ||
178 | /** | |
179 | * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced | |
180 | * @sdp: the filesystem | |
181 | * @ai: the AIL entry | |
182 | * | |
183 | */ | |
184 | ||
185 | void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai) | |
186 | { | |
187 | struct list_head *head = &ai->ai_ail2_list; | |
188 | struct gfs2_bufdata *bd; | |
189 | ||
190 | while (!list_empty(head)) { | |
191 | bd = list_entry(head->prev, struct gfs2_bufdata, | |
192 | bd_ail_st_list); | |
193 | gfs2_assert(sdp, bd->bd_ail == ai); | |
194 | bd->bd_ail = NULL; | |
195 | list_del(&bd->bd_ail_st_list); | |
196 | list_del(&bd->bd_ail_gl_list); | |
197 | atomic_dec(&bd->bd_gl->gl_ail_count); | |
198 | brelse(bd->bd_bh); | |
199 | } | |
200 | } | |
201 | ||
202 | /** | |
203 | * ail_empty_gl - remove all buffers for a given lock from the AIL | |
204 | * @gl: the glock | |
205 | * | |
206 | * None of the buffers should be dirty, locked, or pinned. | |
207 | */ | |
208 | ||
209 | void gfs2_ail_empty_gl(struct gfs2_glock *gl) | |
210 | { | |
211 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
212 | unsigned int blocks; | |
213 | struct list_head *head = &gl->gl_ail_list; | |
214 | struct gfs2_bufdata *bd; | |
215 | struct buffer_head *bh; | |
cd915493 | 216 | u64 blkno; |
b3b94faa DT |
217 | int error; |
218 | ||
219 | blocks = atomic_read(&gl->gl_ail_count); | |
220 | if (!blocks) | |
221 | return; | |
222 | ||
223 | error = gfs2_trans_begin(sdp, 0, blocks); | |
224 | if (gfs2_assert_withdraw(sdp, !error)) | |
225 | return; | |
226 | ||
227 | gfs2_log_lock(sdp); | |
228 | while (!list_empty(head)) { | |
229 | bd = list_entry(head->next, struct gfs2_bufdata, | |
230 | bd_ail_gl_list); | |
231 | bh = bd->bd_bh; | |
232 | blkno = bh->b_blocknr; | |
233 | gfs2_assert_withdraw(sdp, !buffer_busy(bh)); | |
234 | ||
235 | bd->bd_ail = NULL; | |
236 | list_del(&bd->bd_ail_st_list); | |
237 | list_del(&bd->bd_ail_gl_list); | |
238 | atomic_dec(&gl->gl_ail_count); | |
239 | brelse(bh); | |
240 | gfs2_log_unlock(sdp); | |
241 | ||
242 | gfs2_trans_add_revoke(sdp, blkno); | |
243 | ||
244 | gfs2_log_lock(sdp); | |
245 | } | |
246 | gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count)); | |
247 | gfs2_log_unlock(sdp); | |
248 | ||
249 | gfs2_trans_end(sdp); | |
b09e593d | 250 | gfs2_log_flush(sdp, NULL); |
b3b94faa DT |
251 | } |
252 | ||
253 | /** | |
254 | * gfs2_meta_inval - Invalidate all buffers associated with a glock | |
255 | * @gl: the glock | |
256 | * | |
257 | */ | |
258 | ||
259 | void gfs2_meta_inval(struct gfs2_glock *gl) | |
260 | { | |
261 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
262 | struct inode *aspace = gl->gl_aspace; | |
263 | struct address_space *mapping = gl->gl_aspace->i_mapping; | |
264 | ||
265 | gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count)); | |
266 | ||
267 | atomic_inc(&aspace->i_writecount); | |
268 | truncate_inode_pages(mapping, 0); | |
269 | atomic_dec(&aspace->i_writecount); | |
270 | ||
271 | gfs2_assert_withdraw(sdp, !mapping->nrpages); | |
272 | } | |
273 | ||
274 | /** | |
275 | * gfs2_meta_sync - Sync all buffers associated with a glock | |
276 | * @gl: The glock | |
277 | * @flags: DIO_START | DIO_WAIT | |
278 | * | |
279 | */ | |
280 | ||
281 | void gfs2_meta_sync(struct gfs2_glock *gl, int flags) | |
282 | { | |
283 | struct address_space *mapping = gl->gl_aspace->i_mapping; | |
284 | int error = 0; | |
285 | ||
286 | if (flags & DIO_START) | |
287 | filemap_fdatawrite(mapping); | |
288 | if (!error && (flags & DIO_WAIT)) | |
289 | error = filemap_fdatawait(mapping); | |
290 | ||
291 | if (error) | |
292 | gfs2_io_error(gl->gl_sbd); | |
293 | } | |
294 | ||
295 | /** | |
296 | * getbuf - Get a buffer with a given address space | |
297 | * @sdp: the filesystem | |
298 | * @aspace: the address space | |
299 | * @blkno: the block number (filesystem scope) | |
300 | * @create: 1 if the buffer should be created | |
301 | * | |
302 | * Returns: the buffer | |
303 | */ | |
304 | ||
305 | static struct buffer_head *getbuf(struct gfs2_sbd *sdp, struct inode *aspace, | |
cd915493 | 306 | u64 blkno, int create) |
b3b94faa DT |
307 | { |
308 | struct page *page; | |
309 | struct buffer_head *bh; | |
310 | unsigned int shift; | |
311 | unsigned long index; | |
312 | unsigned int bufnum; | |
313 | ||
314 | shift = PAGE_CACHE_SHIFT - sdp->sd_sb.sb_bsize_shift; | |
315 | index = blkno >> shift; /* convert block to page */ | |
316 | bufnum = blkno - (index << shift); /* block buf index within page */ | |
317 | ||
318 | if (create) { | |
319 | for (;;) { | |
320 | page = grab_cache_page(aspace->i_mapping, index); | |
321 | if (page) | |
322 | break; | |
323 | yield(); | |
324 | } | |
325 | } else { | |
326 | page = find_lock_page(aspace->i_mapping, index); | |
327 | if (!page) | |
328 | return NULL; | |
329 | } | |
330 | ||
331 | if (!page_has_buffers(page)) | |
332 | create_empty_buffers(page, sdp->sd_sb.sb_bsize, 0); | |
333 | ||
334 | /* Locate header for our buffer within our page */ | |
335 | for (bh = page_buffers(page); bufnum--; bh = bh->b_this_page) | |
336 | /* Do nothing */; | |
337 | get_bh(bh); | |
338 | ||
339 | if (!buffer_mapped(bh)) | |
340 | map_bh(bh, sdp->sd_vfs, blkno); | |
341 | ||
342 | unlock_page(page); | |
343 | mark_page_accessed(page); | |
344 | page_cache_release(page); | |
345 | ||
346 | return bh; | |
347 | } | |
348 | ||
349 | static void meta_prep_new(struct buffer_head *bh) | |
350 | { | |
351 | struct gfs2_meta_header *mh = (struct gfs2_meta_header *)bh->b_data; | |
352 | ||
353 | lock_buffer(bh); | |
354 | clear_buffer_dirty(bh); | |
355 | set_buffer_uptodate(bh); | |
356 | unlock_buffer(bh); | |
357 | ||
358 | mh->mh_magic = cpu_to_be32(GFS2_MAGIC); | |
359 | } | |
360 | ||
361 | /** | |
362 | * gfs2_meta_new - Get a block | |
363 | * @gl: The glock associated with this block | |
364 | * @blkno: The block number | |
365 | * | |
366 | * Returns: The buffer | |
367 | */ | |
368 | ||
cd915493 | 369 | struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno) |
b3b94faa DT |
370 | { |
371 | struct buffer_head *bh; | |
372 | bh = getbuf(gl->gl_sbd, gl->gl_aspace, blkno, CREATE); | |
373 | meta_prep_new(bh); | |
374 | return bh; | |
375 | } | |
376 | ||
377 | /** | |
378 | * gfs2_meta_read - Read a block from disk | |
379 | * @gl: The glock covering the block | |
380 | * @blkno: The block number | |
381 | * @flags: flags to gfs2_dreread() | |
382 | * @bhp: the place where the buffer is returned (NULL on failure) | |
383 | * | |
384 | * Returns: errno | |
385 | */ | |
386 | ||
cd915493 | 387 | int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags, |
b3b94faa DT |
388 | struct buffer_head **bhp) |
389 | { | |
390 | int error; | |
391 | ||
392 | *bhp = getbuf(gl->gl_sbd, gl->gl_aspace, blkno, CREATE); | |
393 | error = gfs2_meta_reread(gl->gl_sbd, *bhp, flags); | |
394 | if (error) | |
395 | brelse(*bhp); | |
396 | ||
397 | return error; | |
398 | } | |
399 | ||
400 | /** | |
401 | * gfs2_meta_reread - Reread a block from disk | |
402 | * @sdp: the filesystem | |
403 | * @bh: The block to read | |
404 | * @flags: Flags that control the read | |
405 | * | |
406 | * Returns: errno | |
407 | */ | |
408 | ||
409 | int gfs2_meta_reread(struct gfs2_sbd *sdp, struct buffer_head *bh, int flags) | |
410 | { | |
411 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
412 | return -EIO; | |
413 | ||
414 | if (flags & DIO_FORCE) | |
415 | clear_buffer_uptodate(bh); | |
416 | ||
417 | if ((flags & DIO_START) && !buffer_uptodate(bh)) | |
418 | ll_rw_block(READ, 1, &bh); | |
419 | ||
420 | if (flags & DIO_WAIT) { | |
421 | wait_on_buffer(bh); | |
422 | ||
423 | if (!buffer_uptodate(bh)) { | |
5c676f6d | 424 | struct gfs2_trans *tr = current->journal_info; |
b3b94faa DT |
425 | if (tr && tr->tr_touched) |
426 | gfs2_io_error_bh(sdp, bh); | |
427 | return -EIO; | |
428 | } | |
429 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
430 | return -EIO; | |
431 | } | |
432 | ||
433 | return 0; | |
434 | } | |
435 | ||
436 | /** | |
586dfdaa | 437 | * gfs2_attach_bufdata - attach a struct gfs2_bufdata structure to a buffer |
b3b94faa DT |
438 | * @gl: the glock the buffer belongs to |
439 | * @bh: The buffer to be attached to | |
586dfdaa | 440 | * @meta: Flag to indicate whether its metadata or not |
b3b94faa DT |
441 | */ |
442 | ||
568f4c96 SW |
443 | void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh, |
444 | int meta) | |
b3b94faa DT |
445 | { |
446 | struct gfs2_bufdata *bd; | |
447 | ||
18ec7d5c SW |
448 | if (meta) |
449 | lock_page(bh->b_page); | |
b3b94faa | 450 | |
5c676f6d | 451 | if (bh->b_private) { |
18ec7d5c SW |
452 | if (meta) |
453 | unlock_page(bh->b_page); | |
b3b94faa DT |
454 | return; |
455 | } | |
456 | ||
f55ab26a | 457 | bd = kmem_cache_alloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL), |
b3b94faa | 458 | memset(bd, 0, sizeof(struct gfs2_bufdata)); |
b3b94faa DT |
459 | bd->bd_bh = bh; |
460 | bd->bd_gl = gl; | |
461 | ||
462 | INIT_LIST_HEAD(&bd->bd_list_tr); | |
18ec7d5c | 463 | if (meta) { |
586dfdaa | 464 | lops_init_le(&bd->bd_le, &gfs2_buf_lops); |
18ec7d5c | 465 | } else { |
586dfdaa | 466 | lops_init_le(&bd->bd_le, &gfs2_databuf_lops); |
18ec7d5c | 467 | } |
5c676f6d | 468 | bh->b_private = bd; |
b3b94faa | 469 | |
18ec7d5c SW |
470 | if (meta) |
471 | unlock_page(bh->b_page); | |
b3b94faa DT |
472 | } |
473 | ||
474 | /** | |
a98ab220 | 475 | * gfs2_pin - Pin a buffer in memory |
b3b94faa DT |
476 | * @sdp: the filesystem the buffer belongs to |
477 | * @bh: The buffer to be pinned | |
478 | * | |
479 | */ | |
480 | ||
a98ab220 | 481 | void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh) |
b3b94faa | 482 | { |
5c676f6d | 483 | struct gfs2_bufdata *bd = bh->b_private; |
b3b94faa DT |
484 | |
485 | gfs2_assert_withdraw(sdp, test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)); | |
486 | ||
487 | if (test_set_buffer_pinned(bh)) | |
488 | gfs2_assert_withdraw(sdp, 0); | |
489 | ||
490 | wait_on_buffer(bh); | |
491 | ||
492 | /* If this buffer is in the AIL and it has already been written | |
493 | to in-place disk block, remove it from the AIL. */ | |
494 | ||
495 | gfs2_log_lock(sdp); | |
496 | if (bd->bd_ail && !buffer_in_io(bh)) | |
497 | list_move(&bd->bd_ail_st_list, &bd->bd_ail->ai_ail2_list); | |
498 | gfs2_log_unlock(sdp); | |
499 | ||
500 | clear_buffer_dirty(bh); | |
501 | wait_on_buffer(bh); | |
502 | ||
503 | if (!buffer_uptodate(bh)) | |
504 | gfs2_io_error_bh(sdp, bh); | |
505 | ||
506 | get_bh(bh); | |
507 | } | |
508 | ||
509 | /** | |
a98ab220 | 510 | * gfs2_unpin - Unpin a buffer |
b3b94faa DT |
511 | * @sdp: the filesystem the buffer belongs to |
512 | * @bh: The buffer to unpin | |
513 | * @ai: | |
514 | * | |
515 | */ | |
516 | ||
a98ab220 SW |
517 | void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh, |
518 | struct gfs2_ail *ai) | |
b3b94faa | 519 | { |
5c676f6d | 520 | struct gfs2_bufdata *bd = bh->b_private; |
b3b94faa DT |
521 | |
522 | gfs2_assert_withdraw(sdp, buffer_uptodate(bh)); | |
523 | ||
524 | if (!buffer_pinned(bh)) | |
525 | gfs2_assert_withdraw(sdp, 0); | |
526 | ||
527 | mark_buffer_dirty(bh); | |
528 | clear_buffer_pinned(bh); | |
529 | ||
530 | gfs2_log_lock(sdp); | |
531 | if (bd->bd_ail) { | |
532 | list_del(&bd->bd_ail_st_list); | |
533 | brelse(bh); | |
534 | } else { | |
535 | struct gfs2_glock *gl = bd->bd_gl; | |
536 | list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list); | |
537 | atomic_inc(&gl->gl_ail_count); | |
538 | } | |
539 | bd->bd_ail = ai; | |
540 | list_add(&bd->bd_ail_st_list, &ai->ai_ail1_list); | |
541 | gfs2_log_unlock(sdp); | |
542 | } | |
543 | ||
544 | /** | |
545 | * gfs2_meta_wipe - make inode's buffers so they aren't dirty/pinned anymore | |
546 | * @ip: the inode who owns the buffers | |
547 | * @bstart: the first buffer in the run | |
548 | * @blen: the number of buffers in the run | |
549 | * | |
550 | */ | |
551 | ||
cd915493 | 552 | void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen) |
b3b94faa | 553 | { |
feaa7bba | 554 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
555 | struct inode *aspace = ip->i_gl->gl_aspace; |
556 | struct buffer_head *bh; | |
557 | ||
558 | while (blen) { | |
559 | bh = getbuf(sdp, aspace, bstart, NO_CREATE); | |
560 | if (bh) { | |
5c676f6d | 561 | struct gfs2_bufdata *bd = bh->b_private; |
b3b94faa DT |
562 | |
563 | if (test_clear_buffer_pinned(bh)) { | |
5c676f6d | 564 | struct gfs2_trans *tr = current->journal_info; |
b3b94faa DT |
565 | gfs2_log_lock(sdp); |
566 | list_del_init(&bd->bd_le.le_list); | |
567 | gfs2_assert_warn(sdp, sdp->sd_log_num_buf); | |
568 | sdp->sd_log_num_buf--; | |
569 | gfs2_log_unlock(sdp); | |
5c676f6d | 570 | tr->tr_num_buf_rm++; |
b3b94faa DT |
571 | brelse(bh); |
572 | } | |
573 | if (bd) { | |
574 | gfs2_log_lock(sdp); | |
575 | if (bd->bd_ail) { | |
cd915493 | 576 | u64 blkno = bh->b_blocknr; |
b3b94faa DT |
577 | bd->bd_ail = NULL; |
578 | list_del(&bd->bd_ail_st_list); | |
579 | list_del(&bd->bd_ail_gl_list); | |
580 | atomic_dec(&bd->bd_gl->gl_ail_count); | |
581 | brelse(bh); | |
582 | gfs2_log_unlock(sdp); | |
583 | gfs2_trans_add_revoke(sdp, blkno); | |
584 | } else | |
585 | gfs2_log_unlock(sdp); | |
586 | } | |
587 | ||
588 | lock_buffer(bh); | |
589 | clear_buffer_dirty(bh); | |
590 | clear_buffer_uptodate(bh); | |
591 | unlock_buffer(bh); | |
592 | ||
593 | brelse(bh); | |
594 | } | |
595 | ||
596 | bstart++; | |
597 | blen--; | |
598 | } | |
599 | } | |
600 | ||
601 | /** | |
602 | * gfs2_meta_cache_flush - get rid of any references on buffers for this inode | |
603 | * @ip: The GFS2 inode | |
604 | * | |
605 | * This releases buffers that are in the most-recently-used array of | |
606 | * blocks used for indirect block addressing for this inode. | |
607 | */ | |
608 | ||
609 | void gfs2_meta_cache_flush(struct gfs2_inode *ip) | |
610 | { | |
611 | struct buffer_head **bh_slot; | |
612 | unsigned int x; | |
613 | ||
614 | spin_lock(&ip->i_spin); | |
615 | ||
616 | for (x = 0; x < GFS2_MAX_META_HEIGHT; x++) { | |
617 | bh_slot = &ip->i_cache[x]; | |
618 | if (!*bh_slot) | |
619 | break; | |
620 | brelse(*bh_slot); | |
621 | *bh_slot = NULL; | |
622 | } | |
623 | ||
624 | spin_unlock(&ip->i_spin); | |
625 | } | |
626 | ||
627 | /** | |
628 | * gfs2_meta_indirect_buffer - Get a metadata buffer | |
629 | * @ip: The GFS2 inode | |
630 | * @height: The level of this buf in the metadata (indir addr) tree (if any) | |
631 | * @num: The block number (device relative) of the buffer | |
632 | * @new: Non-zero if we may create a new buffer | |
633 | * @bhp: the buffer is returned here | |
634 | * | |
635 | * Try to use the gfs2_inode's MRU metadata tree cache. | |
636 | * | |
637 | * Returns: errno | |
638 | */ | |
639 | ||
cd915493 | 640 | int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num, |
b3b94faa DT |
641 | int new, struct buffer_head **bhp) |
642 | { | |
643 | struct buffer_head *bh, **bh_slot = ip->i_cache + height; | |
644 | int error; | |
645 | ||
646 | spin_lock(&ip->i_spin); | |
647 | bh = *bh_slot; | |
648 | if (bh) { | |
649 | if (bh->b_blocknr == num) | |
650 | get_bh(bh); | |
651 | else | |
652 | bh = NULL; | |
653 | } | |
654 | spin_unlock(&ip->i_spin); | |
655 | ||
656 | if (bh) { | |
657 | if (new) | |
658 | meta_prep_new(bh); | |
659 | else { | |
feaa7bba | 660 | error = gfs2_meta_reread(GFS2_SB(&ip->i_inode), bh, |
b3b94faa DT |
661 | DIO_START | DIO_WAIT); |
662 | if (error) { | |
663 | brelse(bh); | |
664 | return error; | |
665 | } | |
666 | } | |
667 | } else { | |
668 | if (new) | |
669 | bh = gfs2_meta_new(ip->i_gl, num); | |
670 | else { | |
671 | error = gfs2_meta_read(ip->i_gl, num, | |
672 | DIO_START | DIO_WAIT, &bh); | |
673 | if (error) | |
674 | return error; | |
675 | } | |
676 | ||
677 | spin_lock(&ip->i_spin); | |
678 | if (*bh_slot != bh) { | |
679 | brelse(*bh_slot); | |
680 | *bh_slot = bh; | |
681 | get_bh(bh); | |
682 | } | |
683 | spin_unlock(&ip->i_spin); | |
684 | } | |
685 | ||
686 | if (new) { | |
feaa7bba | 687 | if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), height)) { |
b3b94faa DT |
688 | brelse(bh); |
689 | return -EIO; | |
690 | } | |
d4e9c4c3 | 691 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
692 | gfs2_metatype_set(bh, GFS2_METATYPE_IN, GFS2_FORMAT_IN); |
693 | gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); | |
694 | ||
feaa7bba | 695 | } else if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, |
b3b94faa DT |
696 | (height) ? GFS2_METATYPE_IN : GFS2_METATYPE_DI)) { |
697 | brelse(bh); | |
698 | return -EIO; | |
699 | } | |
700 | ||
701 | *bhp = bh; | |
702 | ||
703 | return 0; | |
704 | } | |
705 | ||
706 | /** | |
707 | * gfs2_meta_ra - start readahead on an extent of a file | |
708 | * @gl: the glock the blocks belong to | |
709 | * @dblock: the starting disk block | |
710 | * @extlen: the number of blocks in the extent | |
711 | * | |
712 | */ | |
713 | ||
cd915493 | 714 | void gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen) |
b3b94faa DT |
715 | { |
716 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
717 | struct inode *aspace = gl->gl_aspace; | |
718 | struct buffer_head *first_bh, *bh; | |
cd915493 | 719 | u32 max_ra = gfs2_tune_get(sdp, gt_max_readahead) >> |
568f4c96 | 720 | sdp->sd_sb.sb_bsize_shift; |
b3b94faa DT |
721 | int error; |
722 | ||
723 | if (!extlen || !max_ra) | |
724 | return; | |
725 | if (extlen > max_ra) | |
726 | extlen = max_ra; | |
727 | ||
728 | first_bh = getbuf(sdp, aspace, dblock, CREATE); | |
729 | ||
730 | if (buffer_uptodate(first_bh)) | |
731 | goto out; | |
732 | if (!buffer_locked(first_bh)) { | |
733 | error = gfs2_meta_reread(sdp, first_bh, DIO_START); | |
734 | if (error) | |
735 | goto out; | |
736 | } | |
737 | ||
738 | dblock++; | |
739 | extlen--; | |
740 | ||
741 | while (extlen) { | |
742 | bh = getbuf(sdp, aspace, dblock, CREATE); | |
743 | ||
744 | if (!buffer_uptodate(bh) && !buffer_locked(bh)) { | |
745 | error = gfs2_meta_reread(sdp, bh, DIO_START); | |
746 | brelse(bh); | |
747 | if (error) | |
748 | goto out; | |
749 | } else | |
750 | brelse(bh); | |
751 | ||
752 | dblock++; | |
753 | extlen--; | |
754 | ||
755 | if (buffer_uptodate(first_bh)) | |
756 | break; | |
757 | } | |
758 | ||
a91ea69f | 759 | out: |
b3b94faa DT |
760 | brelse(first_bh); |
761 | } | |
762 | ||
763 | /** | |
764 | * gfs2_meta_syncfs - sync all the buffers in a filesystem | |
765 | * @sdp: the filesystem | |
766 | * | |
767 | */ | |
768 | ||
769 | void gfs2_meta_syncfs(struct gfs2_sbd *sdp) | |
770 | { | |
b09e593d | 771 | gfs2_log_flush(sdp, NULL); |
b3b94faa DT |
772 | for (;;) { |
773 | gfs2_ail1_start(sdp, DIO_ALL); | |
774 | if (gfs2_ail1_empty(sdp, DIO_ALL)) | |
775 | break; | |
fe1bdedc | 776 | msleep(10); |
b3b94faa DT |
777 | } |
778 | } | |
779 |