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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3 | * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. | |
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 | |
7 | * of the GNU General Public License v.2. | |
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> | |
20 | #include <asm/semaphore.h> | |
21 | ||
22 | #include "gfs2.h" | |
23 | #include "glock.h" | |
24 | #include "glops.h" | |
25 | #include "inode.h" | |
26 | #include "log.h" | |
27 | #include "lops.h" | |
28 | #include "meta_io.h" | |
29 | #include "rgrp.h" | |
30 | #include "trans.h" | |
31 | ||
32 | #define buffer_busy(bh) \ | |
33 | ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned))) | |
34 | #define buffer_in_io(bh) \ | |
35 | ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock))) | |
36 | ||
37 | static int aspace_get_block(struct inode *inode, sector_t lblock, | |
38 | struct buffer_head *bh_result, int create) | |
39 | { | |
40 | gfs2_assert_warn(get_v2sdp(inode->i_sb), 0); | |
41 | return -EOPNOTSUPP; | |
42 | } | |
43 | ||
44 | static int gfs2_aspace_writepage(struct page *page, | |
45 | struct writeback_control *wbc) | |
46 | { | |
47 | return block_write_full_page(page, aspace_get_block, wbc); | |
48 | } | |
49 | ||
50 | /** | |
51 | * stuck_releasepage - We're stuck in gfs2_releasepage(). Print stuff out. | |
52 | * @bh: the buffer we're stuck on | |
53 | * | |
54 | */ | |
55 | ||
56 | static void stuck_releasepage(struct buffer_head *bh) | |
57 | { | |
58 | struct gfs2_sbd *sdp = get_v2sdp(bh->b_page->mapping->host->i_sb); | |
59 | struct gfs2_bufdata *bd = get_v2bd(bh); | |
60 | struct gfs2_glock *gl; | |
61 | ||
62 | fs_warn(sdp, "stuck in gfs2_releasepage()\n"); | |
63 | fs_warn(sdp, "blkno = %llu, bh->b_count = %d\n", | |
64 | (uint64_t)bh->b_blocknr, atomic_read(&bh->b_count)); | |
65 | fs_warn(sdp, "pinned = %u\n", buffer_pinned(bh)); | |
66 | fs_warn(sdp, "get_v2bd(bh) = %s\n", (bd) ? "!NULL" : "NULL"); | |
67 | ||
68 | if (!bd) | |
69 | return; | |
70 | ||
71 | gl = bd->bd_gl; | |
72 | ||
73 | fs_warn(sdp, "gl = (%u, %llu)\n", | |
74 | gl->gl_name.ln_type, gl->gl_name.ln_number); | |
75 | ||
76 | fs_warn(sdp, "bd_list_tr = %s, bd_le.le_list = %s\n", | |
77 | (list_empty(&bd->bd_list_tr)) ? "no" : "yes", | |
78 | (list_empty(&bd->bd_le.le_list)) ? "no" : "yes"); | |
79 | ||
80 | if (gl->gl_ops == &gfs2_inode_glops) { | |
81 | struct gfs2_inode *ip = get_gl2ip(gl); | |
82 | unsigned int x; | |
83 | ||
84 | if (!ip) | |
85 | return; | |
86 | ||
87 | fs_warn(sdp, "ip = %llu %llu\n", | |
88 | ip->i_num.no_formal_ino, ip->i_num.no_addr); | |
89 | fs_warn(sdp, "ip->i_count = %d, ip->i_vnode = %s\n", | |
90 | atomic_read(&ip->i_count), | |
91 | (ip->i_vnode) ? "!NULL" : "NULL"); | |
92 | ||
93 | for (x = 0; x < GFS2_MAX_META_HEIGHT; x++) | |
94 | fs_warn(sdp, "ip->i_cache[%u] = %s\n", | |
95 | x, (ip->i_cache[x]) ? "!NULL" : "NULL"); | |
96 | } | |
97 | } | |
98 | ||
99 | /** | |
100 | * gfs2_aspace_releasepage - free the metadata associated with a page | |
101 | * @page: the page that's being released | |
102 | * @gfp_mask: passed from Linux VFS, ignored by us | |
103 | * | |
104 | * Call try_to_free_buffers() if the buffers in this page can be | |
105 | * released. | |
106 | * | |
107 | * Returns: 0 | |
108 | */ | |
109 | ||
110 | static int gfs2_aspace_releasepage(struct page *page, gfp_t gfp_mask) | |
111 | { | |
112 | struct inode *aspace = page->mapping->host; | |
113 | struct gfs2_sbd *sdp = get_v2sdp(aspace->i_sb); | |
114 | struct buffer_head *bh, *head; | |
115 | struct gfs2_bufdata *bd; | |
116 | unsigned long t; | |
117 | ||
118 | if (!page_has_buffers(page)) | |
119 | goto out; | |
120 | ||
121 | head = bh = page_buffers(page); | |
122 | do { | |
123 | t = jiffies; | |
124 | ||
125 | while (atomic_read(&bh->b_count)) { | |
126 | if (atomic_read(&aspace->i_writecount)) { | |
127 | if (time_after_eq(jiffies, t + | |
128 | gfs2_tune_get(sdp, gt_stall_secs) * HZ)) { | |
129 | stuck_releasepage(bh); | |
130 | t = jiffies; | |
131 | } | |
132 | ||
133 | yield(); | |
134 | continue; | |
135 | } | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | gfs2_assert_warn(sdp, !buffer_pinned(bh)); | |
141 | ||
142 | bd = get_v2bd(bh); | |
143 | if (bd) { | |
144 | gfs2_assert_warn(sdp, bd->bd_bh == bh); | |
145 | gfs2_assert_warn(sdp, list_empty(&bd->bd_list_tr)); | |
146 | gfs2_assert_warn(sdp, list_empty(&bd->bd_le.le_list)); | |
147 | gfs2_assert_warn(sdp, !bd->bd_ail); | |
148 | kmem_cache_free(gfs2_bufdata_cachep, bd); | |
149 | atomic_dec(&sdp->sd_bufdata_count); | |
150 | set_v2bd(bh, NULL); | |
151 | } | |
152 | ||
153 | bh = bh->b_this_page; | |
154 | } | |
155 | while (bh != head); | |
156 | ||
157 | out: | |
158 | return try_to_free_buffers(page); | |
159 | } | |
160 | ||
161 | static struct address_space_operations aspace_aops = { | |
162 | .writepage = gfs2_aspace_writepage, | |
163 | .releasepage = gfs2_aspace_releasepage, | |
164 | }; | |
165 | ||
166 | /** | |
167 | * gfs2_aspace_get - Create and initialize a struct inode structure | |
168 | * @sdp: the filesystem the aspace is in | |
169 | * | |
170 | * Right now a struct inode is just a struct inode. Maybe Linux | |
171 | * will supply a more lightweight address space construct (that works) | |
172 | * in the future. | |
173 | * | |
174 | * Make sure pages/buffers in this aspace aren't in high memory. | |
175 | * | |
176 | * Returns: the aspace | |
177 | */ | |
178 | ||
179 | struct inode *gfs2_aspace_get(struct gfs2_sbd *sdp) | |
180 | { | |
181 | struct inode *aspace; | |
182 | ||
183 | aspace = new_inode(sdp->sd_vfs); | |
184 | if (aspace) { | |
185 | mapping_set_gfp_mask(aspace->i_mapping, GFP_KERNEL); | |
186 | aspace->i_mapping->a_ops = &aspace_aops; | |
187 | aspace->i_size = ~0ULL; | |
188 | set_v2ip(aspace, NULL); | |
189 | insert_inode_hash(aspace); | |
190 | } | |
191 | ||
192 | return aspace; | |
193 | } | |
194 | ||
195 | void gfs2_aspace_put(struct inode *aspace) | |
196 | { | |
197 | remove_inode_hash(aspace); | |
198 | iput(aspace); | |
199 | } | |
200 | ||
201 | /** | |
202 | * gfs2_ail1_start_one - Start I/O on a part of the AIL | |
203 | * @sdp: the filesystem | |
204 | * @tr: the part of the AIL | |
205 | * | |
206 | */ | |
207 | ||
208 | void gfs2_ail1_start_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai) | |
209 | { | |
210 | struct gfs2_bufdata *bd, *s; | |
211 | struct buffer_head *bh; | |
212 | int retry; | |
213 | ||
214 | do { | |
215 | retry = 0; | |
216 | ||
217 | list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, | |
218 | bd_ail_st_list) { | |
219 | bh = bd->bd_bh; | |
220 | ||
221 | gfs2_assert(sdp, bd->bd_ail == ai); | |
222 | ||
223 | if (!buffer_busy(bh)) { | |
224 | if (!buffer_uptodate(bh)) | |
225 | gfs2_io_error_bh(sdp, bh); | |
226 | list_move(&bd->bd_ail_st_list, | |
227 | &ai->ai_ail2_list); | |
228 | continue; | |
229 | } | |
230 | ||
231 | if (!buffer_dirty(bh)) | |
232 | continue; | |
233 | ||
234 | list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list); | |
235 | ||
236 | gfs2_log_unlock(sdp); | |
237 | wait_on_buffer(bh); | |
238 | ll_rw_block(WRITE, 1, &bh); | |
239 | gfs2_log_lock(sdp); | |
240 | ||
241 | retry = 1; | |
242 | break; | |
243 | } | |
244 | } while (retry); | |
245 | } | |
246 | ||
247 | /** | |
248 | * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced | |
249 | * @sdp: the filesystem | |
250 | * @ai: the AIL entry | |
251 | * | |
252 | */ | |
253 | ||
254 | int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai, int flags) | |
255 | { | |
256 | struct gfs2_bufdata *bd, *s; | |
257 | struct buffer_head *bh; | |
258 | ||
259 | list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, | |
260 | bd_ail_st_list) { | |
261 | bh = bd->bd_bh; | |
262 | ||
263 | gfs2_assert(sdp, bd->bd_ail == ai); | |
264 | ||
265 | if (buffer_busy(bh)) { | |
266 | if (flags & DIO_ALL) | |
267 | continue; | |
268 | else | |
269 | break; | |
270 | } | |
271 | ||
272 | if (!buffer_uptodate(bh)) | |
273 | gfs2_io_error_bh(sdp, bh); | |
274 | ||
275 | list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list); | |
276 | } | |
277 | ||
278 | return list_empty(&ai->ai_ail1_list); | |
279 | } | |
280 | ||
281 | /** | |
282 | * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced | |
283 | * @sdp: the filesystem | |
284 | * @ai: the AIL entry | |
285 | * | |
286 | */ | |
287 | ||
288 | void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai) | |
289 | { | |
290 | struct list_head *head = &ai->ai_ail2_list; | |
291 | struct gfs2_bufdata *bd; | |
292 | ||
293 | while (!list_empty(head)) { | |
294 | bd = list_entry(head->prev, struct gfs2_bufdata, | |
295 | bd_ail_st_list); | |
296 | gfs2_assert(sdp, bd->bd_ail == ai); | |
297 | bd->bd_ail = NULL; | |
298 | list_del(&bd->bd_ail_st_list); | |
299 | list_del(&bd->bd_ail_gl_list); | |
300 | atomic_dec(&bd->bd_gl->gl_ail_count); | |
301 | brelse(bd->bd_bh); | |
302 | } | |
303 | } | |
304 | ||
305 | /** | |
306 | * ail_empty_gl - remove all buffers for a given lock from the AIL | |
307 | * @gl: the glock | |
308 | * | |
309 | * None of the buffers should be dirty, locked, or pinned. | |
310 | */ | |
311 | ||
312 | void gfs2_ail_empty_gl(struct gfs2_glock *gl) | |
313 | { | |
314 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
315 | unsigned int blocks; | |
316 | struct list_head *head = &gl->gl_ail_list; | |
317 | struct gfs2_bufdata *bd; | |
318 | struct buffer_head *bh; | |
319 | uint64_t blkno; | |
320 | int error; | |
321 | ||
322 | blocks = atomic_read(&gl->gl_ail_count); | |
323 | if (!blocks) | |
324 | return; | |
325 | ||
326 | error = gfs2_trans_begin(sdp, 0, blocks); | |
327 | if (gfs2_assert_withdraw(sdp, !error)) | |
328 | return; | |
329 | ||
330 | gfs2_log_lock(sdp); | |
331 | while (!list_empty(head)) { | |
332 | bd = list_entry(head->next, struct gfs2_bufdata, | |
333 | bd_ail_gl_list); | |
334 | bh = bd->bd_bh; | |
335 | blkno = bh->b_blocknr; | |
336 | gfs2_assert_withdraw(sdp, !buffer_busy(bh)); | |
337 | ||
338 | bd->bd_ail = NULL; | |
339 | list_del(&bd->bd_ail_st_list); | |
340 | list_del(&bd->bd_ail_gl_list); | |
341 | atomic_dec(&gl->gl_ail_count); | |
342 | brelse(bh); | |
343 | gfs2_log_unlock(sdp); | |
344 | ||
345 | gfs2_trans_add_revoke(sdp, blkno); | |
346 | ||
347 | gfs2_log_lock(sdp); | |
348 | } | |
349 | gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count)); | |
350 | gfs2_log_unlock(sdp); | |
351 | ||
352 | gfs2_trans_end(sdp); | |
353 | gfs2_log_flush(sdp); | |
354 | } | |
355 | ||
356 | /** | |
357 | * gfs2_meta_inval - Invalidate all buffers associated with a glock | |
358 | * @gl: the glock | |
359 | * | |
360 | */ | |
361 | ||
362 | void gfs2_meta_inval(struct gfs2_glock *gl) | |
363 | { | |
364 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
365 | struct inode *aspace = gl->gl_aspace; | |
366 | struct address_space *mapping = gl->gl_aspace->i_mapping; | |
367 | ||
368 | gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count)); | |
369 | ||
370 | atomic_inc(&aspace->i_writecount); | |
371 | truncate_inode_pages(mapping, 0); | |
372 | atomic_dec(&aspace->i_writecount); | |
373 | ||
374 | gfs2_assert_withdraw(sdp, !mapping->nrpages); | |
375 | } | |
376 | ||
377 | /** | |
378 | * gfs2_meta_sync - Sync all buffers associated with a glock | |
379 | * @gl: The glock | |
380 | * @flags: DIO_START | DIO_WAIT | |
381 | * | |
382 | */ | |
383 | ||
384 | void gfs2_meta_sync(struct gfs2_glock *gl, int flags) | |
385 | { | |
386 | struct address_space *mapping = gl->gl_aspace->i_mapping; | |
387 | int error = 0; | |
388 | ||
389 | if (flags & DIO_START) | |
390 | filemap_fdatawrite(mapping); | |
391 | if (!error && (flags & DIO_WAIT)) | |
392 | error = filemap_fdatawait(mapping); | |
393 | ||
394 | if (error) | |
395 | gfs2_io_error(gl->gl_sbd); | |
396 | } | |
397 | ||
398 | /** | |
399 | * getbuf - Get a buffer with a given address space | |
400 | * @sdp: the filesystem | |
401 | * @aspace: the address space | |
402 | * @blkno: the block number (filesystem scope) | |
403 | * @create: 1 if the buffer should be created | |
404 | * | |
405 | * Returns: the buffer | |
406 | */ | |
407 | ||
408 | static struct buffer_head *getbuf(struct gfs2_sbd *sdp, struct inode *aspace, | |
409 | uint64_t blkno, int create) | |
410 | { | |
411 | struct page *page; | |
412 | struct buffer_head *bh; | |
413 | unsigned int shift; | |
414 | unsigned long index; | |
415 | unsigned int bufnum; | |
416 | ||
417 | shift = PAGE_CACHE_SHIFT - sdp->sd_sb.sb_bsize_shift; | |
418 | index = blkno >> shift; /* convert block to page */ | |
419 | bufnum = blkno - (index << shift); /* block buf index within page */ | |
420 | ||
421 | if (create) { | |
422 | for (;;) { | |
423 | page = grab_cache_page(aspace->i_mapping, index); | |
424 | if (page) | |
425 | break; | |
426 | yield(); | |
427 | } | |
428 | } else { | |
429 | page = find_lock_page(aspace->i_mapping, index); | |
430 | if (!page) | |
431 | return NULL; | |
432 | } | |
433 | ||
434 | if (!page_has_buffers(page)) | |
435 | create_empty_buffers(page, sdp->sd_sb.sb_bsize, 0); | |
436 | ||
437 | /* Locate header for our buffer within our page */ | |
438 | for (bh = page_buffers(page); bufnum--; bh = bh->b_this_page) | |
439 | /* Do nothing */; | |
440 | get_bh(bh); | |
441 | ||
442 | if (!buffer_mapped(bh)) | |
443 | map_bh(bh, sdp->sd_vfs, blkno); | |
444 | ||
445 | unlock_page(page); | |
446 | mark_page_accessed(page); | |
447 | page_cache_release(page); | |
448 | ||
449 | return bh; | |
450 | } | |
451 | ||
452 | static void meta_prep_new(struct buffer_head *bh) | |
453 | { | |
454 | struct gfs2_meta_header *mh = (struct gfs2_meta_header *)bh->b_data; | |
455 | ||
456 | lock_buffer(bh); | |
457 | clear_buffer_dirty(bh); | |
458 | set_buffer_uptodate(bh); | |
459 | unlock_buffer(bh); | |
460 | ||
461 | mh->mh_magic = cpu_to_be32(GFS2_MAGIC); | |
462 | } | |
463 | ||
464 | /** | |
465 | * gfs2_meta_new - Get a block | |
466 | * @gl: The glock associated with this block | |
467 | * @blkno: The block number | |
468 | * | |
469 | * Returns: The buffer | |
470 | */ | |
471 | ||
472 | struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, uint64_t blkno) | |
473 | { | |
474 | struct buffer_head *bh; | |
475 | bh = getbuf(gl->gl_sbd, gl->gl_aspace, blkno, CREATE); | |
476 | meta_prep_new(bh); | |
477 | return bh; | |
478 | } | |
479 | ||
480 | /** | |
481 | * gfs2_meta_read - Read a block from disk | |
482 | * @gl: The glock covering the block | |
483 | * @blkno: The block number | |
484 | * @flags: flags to gfs2_dreread() | |
485 | * @bhp: the place where the buffer is returned (NULL on failure) | |
486 | * | |
487 | * Returns: errno | |
488 | */ | |
489 | ||
490 | int gfs2_meta_read(struct gfs2_glock *gl, uint64_t blkno, int flags, | |
491 | struct buffer_head **bhp) | |
492 | { | |
493 | int error; | |
494 | ||
495 | *bhp = getbuf(gl->gl_sbd, gl->gl_aspace, blkno, CREATE); | |
496 | error = gfs2_meta_reread(gl->gl_sbd, *bhp, flags); | |
497 | if (error) | |
498 | brelse(*bhp); | |
499 | ||
500 | return error; | |
501 | } | |
502 | ||
503 | /** | |
504 | * gfs2_meta_reread - Reread a block from disk | |
505 | * @sdp: the filesystem | |
506 | * @bh: The block to read | |
507 | * @flags: Flags that control the read | |
508 | * | |
509 | * Returns: errno | |
510 | */ | |
511 | ||
512 | int gfs2_meta_reread(struct gfs2_sbd *sdp, struct buffer_head *bh, int flags) | |
513 | { | |
514 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
515 | return -EIO; | |
516 | ||
517 | if (flags & DIO_FORCE) | |
518 | clear_buffer_uptodate(bh); | |
519 | ||
520 | if ((flags & DIO_START) && !buffer_uptodate(bh)) | |
521 | ll_rw_block(READ, 1, &bh); | |
522 | ||
523 | if (flags & DIO_WAIT) { | |
524 | wait_on_buffer(bh); | |
525 | ||
526 | if (!buffer_uptodate(bh)) { | |
527 | struct gfs2_trans *tr = get_transaction; | |
528 | if (tr && tr->tr_touched) | |
529 | gfs2_io_error_bh(sdp, bh); | |
530 | return -EIO; | |
531 | } | |
532 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
533 | return -EIO; | |
534 | } | |
535 | ||
536 | return 0; | |
537 | } | |
538 | ||
539 | /** | |
586dfdaa | 540 | * gfs2_attach_bufdata - attach a struct gfs2_bufdata structure to a buffer |
b3b94faa DT |
541 | * @gl: the glock the buffer belongs to |
542 | * @bh: The buffer to be attached to | |
586dfdaa | 543 | * @meta: Flag to indicate whether its metadata or not |
b3b94faa DT |
544 | */ |
545 | ||
586dfdaa | 546 | void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh, int meta) |
b3b94faa DT |
547 | { |
548 | struct gfs2_bufdata *bd; | |
549 | ||
550 | lock_page(bh->b_page); | |
551 | ||
552 | if (get_v2bd(bh)) { | |
553 | unlock_page(bh->b_page); | |
554 | return; | |
555 | } | |
556 | ||
557 | bd = kmem_cache_alloc(gfs2_bufdata_cachep, GFP_KERNEL | __GFP_NOFAIL), | |
558 | atomic_inc(&gl->gl_sbd->sd_bufdata_count); | |
559 | ||
560 | memset(bd, 0, sizeof(struct gfs2_bufdata)); | |
561 | ||
562 | bd->bd_bh = bh; | |
563 | bd->bd_gl = gl; | |
564 | ||
565 | INIT_LIST_HEAD(&bd->bd_list_tr); | |
586dfdaa SW |
566 | if (meta) |
567 | lops_init_le(&bd->bd_le, &gfs2_buf_lops); | |
568 | else | |
569 | lops_init_le(&bd->bd_le, &gfs2_databuf_lops); | |
b3b94faa DT |
570 | |
571 | set_v2bd(bh, bd); | |
572 | ||
573 | unlock_page(bh->b_page); | |
574 | } | |
575 | ||
576 | /** | |
a98ab220 | 577 | * gfs2_pin - Pin a buffer in memory |
b3b94faa DT |
578 | * @sdp: the filesystem the buffer belongs to |
579 | * @bh: The buffer to be pinned | |
580 | * | |
581 | */ | |
582 | ||
a98ab220 | 583 | void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh) |
b3b94faa DT |
584 | { |
585 | struct gfs2_bufdata *bd = get_v2bd(bh); | |
586 | ||
587 | gfs2_assert_withdraw(sdp, test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)); | |
588 | ||
589 | if (test_set_buffer_pinned(bh)) | |
590 | gfs2_assert_withdraw(sdp, 0); | |
591 | ||
592 | wait_on_buffer(bh); | |
593 | ||
594 | /* If this buffer is in the AIL and it has already been written | |
595 | to in-place disk block, remove it from the AIL. */ | |
596 | ||
597 | gfs2_log_lock(sdp); | |
598 | if (bd->bd_ail && !buffer_in_io(bh)) | |
599 | list_move(&bd->bd_ail_st_list, &bd->bd_ail->ai_ail2_list); | |
600 | gfs2_log_unlock(sdp); | |
601 | ||
602 | clear_buffer_dirty(bh); | |
603 | wait_on_buffer(bh); | |
604 | ||
605 | if (!buffer_uptodate(bh)) | |
606 | gfs2_io_error_bh(sdp, bh); | |
607 | ||
608 | get_bh(bh); | |
609 | } | |
610 | ||
611 | /** | |
a98ab220 | 612 | * gfs2_unpin - Unpin a buffer |
b3b94faa DT |
613 | * @sdp: the filesystem the buffer belongs to |
614 | * @bh: The buffer to unpin | |
615 | * @ai: | |
616 | * | |
617 | */ | |
618 | ||
a98ab220 SW |
619 | void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh, |
620 | struct gfs2_ail *ai) | |
b3b94faa DT |
621 | { |
622 | struct gfs2_bufdata *bd = get_v2bd(bh); | |
623 | ||
624 | gfs2_assert_withdraw(sdp, buffer_uptodate(bh)); | |
625 | ||
626 | if (!buffer_pinned(bh)) | |
627 | gfs2_assert_withdraw(sdp, 0); | |
628 | ||
629 | mark_buffer_dirty(bh); | |
630 | clear_buffer_pinned(bh); | |
631 | ||
632 | gfs2_log_lock(sdp); | |
633 | if (bd->bd_ail) { | |
634 | list_del(&bd->bd_ail_st_list); | |
635 | brelse(bh); | |
636 | } else { | |
637 | struct gfs2_glock *gl = bd->bd_gl; | |
638 | list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list); | |
639 | atomic_inc(&gl->gl_ail_count); | |
640 | } | |
641 | bd->bd_ail = ai; | |
642 | list_add(&bd->bd_ail_st_list, &ai->ai_ail1_list); | |
643 | gfs2_log_unlock(sdp); | |
644 | } | |
645 | ||
646 | /** | |
647 | * gfs2_meta_wipe - make inode's buffers so they aren't dirty/pinned anymore | |
648 | * @ip: the inode who owns the buffers | |
649 | * @bstart: the first buffer in the run | |
650 | * @blen: the number of buffers in the run | |
651 | * | |
652 | */ | |
653 | ||
654 | void gfs2_meta_wipe(struct gfs2_inode *ip, uint64_t bstart, uint32_t blen) | |
655 | { | |
656 | struct gfs2_sbd *sdp = ip->i_sbd; | |
657 | struct inode *aspace = ip->i_gl->gl_aspace; | |
658 | struct buffer_head *bh; | |
659 | ||
660 | while (blen) { | |
661 | bh = getbuf(sdp, aspace, bstart, NO_CREATE); | |
662 | if (bh) { | |
663 | struct gfs2_bufdata *bd = get_v2bd(bh); | |
664 | ||
665 | if (test_clear_buffer_pinned(bh)) { | |
666 | gfs2_log_lock(sdp); | |
667 | list_del_init(&bd->bd_le.le_list); | |
668 | gfs2_assert_warn(sdp, sdp->sd_log_num_buf); | |
669 | sdp->sd_log_num_buf--; | |
670 | gfs2_log_unlock(sdp); | |
671 | get_transaction->tr_num_buf_rm++; | |
672 | brelse(bh); | |
673 | } | |
674 | if (bd) { | |
675 | gfs2_log_lock(sdp); | |
676 | if (bd->bd_ail) { | |
677 | uint64_t blkno = bh->b_blocknr; | |
678 | bd->bd_ail = NULL; | |
679 | list_del(&bd->bd_ail_st_list); | |
680 | list_del(&bd->bd_ail_gl_list); | |
681 | atomic_dec(&bd->bd_gl->gl_ail_count); | |
682 | brelse(bh); | |
683 | gfs2_log_unlock(sdp); | |
684 | gfs2_trans_add_revoke(sdp, blkno); | |
685 | } else | |
686 | gfs2_log_unlock(sdp); | |
687 | } | |
688 | ||
689 | lock_buffer(bh); | |
690 | clear_buffer_dirty(bh); | |
691 | clear_buffer_uptodate(bh); | |
692 | unlock_buffer(bh); | |
693 | ||
694 | brelse(bh); | |
695 | } | |
696 | ||
697 | bstart++; | |
698 | blen--; | |
699 | } | |
700 | } | |
701 | ||
702 | /** | |
703 | * gfs2_meta_cache_flush - get rid of any references on buffers for this inode | |
704 | * @ip: The GFS2 inode | |
705 | * | |
706 | * This releases buffers that are in the most-recently-used array of | |
707 | * blocks used for indirect block addressing for this inode. | |
708 | */ | |
709 | ||
710 | void gfs2_meta_cache_flush(struct gfs2_inode *ip) | |
711 | { | |
712 | struct buffer_head **bh_slot; | |
713 | unsigned int x; | |
714 | ||
715 | spin_lock(&ip->i_spin); | |
716 | ||
717 | for (x = 0; x < GFS2_MAX_META_HEIGHT; x++) { | |
718 | bh_slot = &ip->i_cache[x]; | |
719 | if (!*bh_slot) | |
720 | break; | |
721 | brelse(*bh_slot); | |
722 | *bh_slot = NULL; | |
723 | } | |
724 | ||
725 | spin_unlock(&ip->i_spin); | |
726 | } | |
727 | ||
728 | /** | |
729 | * gfs2_meta_indirect_buffer - Get a metadata buffer | |
730 | * @ip: The GFS2 inode | |
731 | * @height: The level of this buf in the metadata (indir addr) tree (if any) | |
732 | * @num: The block number (device relative) of the buffer | |
733 | * @new: Non-zero if we may create a new buffer | |
734 | * @bhp: the buffer is returned here | |
735 | * | |
736 | * Try to use the gfs2_inode's MRU metadata tree cache. | |
737 | * | |
738 | * Returns: errno | |
739 | */ | |
740 | ||
741 | int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, uint64_t num, | |
742 | int new, struct buffer_head **bhp) | |
743 | { | |
744 | struct buffer_head *bh, **bh_slot = ip->i_cache + height; | |
745 | int error; | |
746 | ||
747 | spin_lock(&ip->i_spin); | |
748 | bh = *bh_slot; | |
749 | if (bh) { | |
750 | if (bh->b_blocknr == num) | |
751 | get_bh(bh); | |
752 | else | |
753 | bh = NULL; | |
754 | } | |
755 | spin_unlock(&ip->i_spin); | |
756 | ||
757 | if (bh) { | |
758 | if (new) | |
759 | meta_prep_new(bh); | |
760 | else { | |
761 | error = gfs2_meta_reread(ip->i_sbd, bh, | |
762 | DIO_START | DIO_WAIT); | |
763 | if (error) { | |
764 | brelse(bh); | |
765 | return error; | |
766 | } | |
767 | } | |
768 | } else { | |
769 | if (new) | |
770 | bh = gfs2_meta_new(ip->i_gl, num); | |
771 | else { | |
772 | error = gfs2_meta_read(ip->i_gl, num, | |
773 | DIO_START | DIO_WAIT, &bh); | |
774 | if (error) | |
775 | return error; | |
776 | } | |
777 | ||
778 | spin_lock(&ip->i_spin); | |
779 | if (*bh_slot != bh) { | |
780 | brelse(*bh_slot); | |
781 | *bh_slot = bh; | |
782 | get_bh(bh); | |
783 | } | |
784 | spin_unlock(&ip->i_spin); | |
785 | } | |
786 | ||
787 | if (new) { | |
788 | if (gfs2_assert_warn(ip->i_sbd, height)) { | |
789 | brelse(bh); | |
790 | return -EIO; | |
791 | } | |
d4e9c4c3 | 792 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
793 | gfs2_metatype_set(bh, GFS2_METATYPE_IN, GFS2_FORMAT_IN); |
794 | gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); | |
795 | ||
796 | } else if (gfs2_metatype_check(ip->i_sbd, bh, | |
797 | (height) ? GFS2_METATYPE_IN : GFS2_METATYPE_DI)) { | |
798 | brelse(bh); | |
799 | return -EIO; | |
800 | } | |
801 | ||
802 | *bhp = bh; | |
803 | ||
804 | return 0; | |
805 | } | |
806 | ||
807 | /** | |
808 | * gfs2_meta_ra - start readahead on an extent of a file | |
809 | * @gl: the glock the blocks belong to | |
810 | * @dblock: the starting disk block | |
811 | * @extlen: the number of blocks in the extent | |
812 | * | |
813 | */ | |
814 | ||
815 | void gfs2_meta_ra(struct gfs2_glock *gl, uint64_t dblock, uint32_t extlen) | |
816 | { | |
817 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
818 | struct inode *aspace = gl->gl_aspace; | |
819 | struct buffer_head *first_bh, *bh; | |
820 | uint32_t max_ra = gfs2_tune_get(sdp, gt_max_readahead) >> sdp->sd_sb.sb_bsize_shift; | |
821 | int error; | |
822 | ||
823 | if (!extlen || !max_ra) | |
824 | return; | |
825 | if (extlen > max_ra) | |
826 | extlen = max_ra; | |
827 | ||
828 | first_bh = getbuf(sdp, aspace, dblock, CREATE); | |
829 | ||
830 | if (buffer_uptodate(first_bh)) | |
831 | goto out; | |
832 | if (!buffer_locked(first_bh)) { | |
833 | error = gfs2_meta_reread(sdp, first_bh, DIO_START); | |
834 | if (error) | |
835 | goto out; | |
836 | } | |
837 | ||
838 | dblock++; | |
839 | extlen--; | |
840 | ||
841 | while (extlen) { | |
842 | bh = getbuf(sdp, aspace, dblock, CREATE); | |
843 | ||
844 | if (!buffer_uptodate(bh) && !buffer_locked(bh)) { | |
845 | error = gfs2_meta_reread(sdp, bh, DIO_START); | |
846 | brelse(bh); | |
847 | if (error) | |
848 | goto out; | |
849 | } else | |
850 | brelse(bh); | |
851 | ||
852 | dblock++; | |
853 | extlen--; | |
854 | ||
855 | if (buffer_uptodate(first_bh)) | |
856 | break; | |
857 | } | |
858 | ||
859 | out: | |
860 | brelse(first_bh); | |
861 | } | |
862 | ||
863 | /** | |
864 | * gfs2_meta_syncfs - sync all the buffers in a filesystem | |
865 | * @sdp: the filesystem | |
866 | * | |
867 | */ | |
868 | ||
869 | void gfs2_meta_syncfs(struct gfs2_sbd *sdp) | |
870 | { | |
871 | gfs2_log_flush(sdp); | |
872 | for (;;) { | |
873 | gfs2_ail1_start(sdp, DIO_ALL); | |
874 | if (gfs2_ail1_empty(sdp, DIO_ALL)) | |
875 | break; | |
876 | msleep(100); | |
877 | } | |
878 | } | |
879 |