Commit | Line | Data |
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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> | |
5c676f6d | 20 | #include <linux/gfs2_ondisk.h> |
b3b94faa DT |
21 | #include <asm/semaphore.h> |
22 | ||
23 | #include "gfs2.h" | |
5c676f6d SW |
24 | #include "lm_interface.h" |
25 | #include "incore.h" | |
b3b94faa DT |
26 | #include "glock.h" |
27 | #include "glops.h" | |
28 | #include "inode.h" | |
29 | #include "log.h" | |
30 | #include "lops.h" | |
31 | #include "meta_io.h" | |
32 | #include "rgrp.h" | |
33 | #include "trans.h" | |
5c676f6d | 34 | #include "util.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 | ||
54 | /** | |
55 | * stuck_releasepage - We're stuck in gfs2_releasepage(). Print stuff out. | |
56 | * @bh: the buffer we're stuck on | |
57 | * | |
58 | */ | |
59 | ||
60 | static void stuck_releasepage(struct buffer_head *bh) | |
61 | { | |
b09e593d SW |
62 | struct inode *inode = bh->b_page->mapping->host; |
63 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; | |
5c676f6d | 64 | struct gfs2_bufdata *bd = bh->b_private; |
b3b94faa DT |
65 | struct gfs2_glock *gl; |
66 | ||
b09e593d | 67 | fs_warn(sdp, "stuck in gfs2_releasepage() %p\n", inode); |
b3b94faa DT |
68 | fs_warn(sdp, "blkno = %llu, bh->b_count = %d\n", |
69 | (uint64_t)bh->b_blocknr, atomic_read(&bh->b_count)); | |
70 | fs_warn(sdp, "pinned = %u\n", buffer_pinned(bh)); | |
5c676f6d | 71 | fs_warn(sdp, "bh->b_private = %s\n", (bd) ? "!NULL" : "NULL"); |
b3b94faa DT |
72 | |
73 | if (!bd) | |
74 | return; | |
75 | ||
76 | gl = bd->bd_gl; | |
77 | ||
78 | fs_warn(sdp, "gl = (%u, %llu)\n", | |
79 | gl->gl_name.ln_type, gl->gl_name.ln_number); | |
80 | ||
81 | fs_warn(sdp, "bd_list_tr = %s, bd_le.le_list = %s\n", | |
82 | (list_empty(&bd->bd_list_tr)) ? "no" : "yes", | |
83 | (list_empty(&bd->bd_le.le_list)) ? "no" : "yes"); | |
84 | ||
85 | if (gl->gl_ops == &gfs2_inode_glops) { | |
5c676f6d | 86 | struct gfs2_inode *ip = gl->gl_object; |
b3b94faa DT |
87 | unsigned int x; |
88 | ||
89 | if (!ip) | |
90 | return; | |
91 | ||
92 | fs_warn(sdp, "ip = %llu %llu\n", | |
93 | ip->i_num.no_formal_ino, ip->i_num.no_addr); | |
94 | fs_warn(sdp, "ip->i_count = %d, ip->i_vnode = %s\n", | |
95 | atomic_read(&ip->i_count), | |
96 | (ip->i_vnode) ? "!NULL" : "NULL"); | |
97 | ||
98 | for (x = 0; x < GFS2_MAX_META_HEIGHT; x++) | |
99 | fs_warn(sdp, "ip->i_cache[%u] = %s\n", | |
100 | x, (ip->i_cache[x]) ? "!NULL" : "NULL"); | |
101 | } | |
102 | } | |
103 | ||
104 | /** | |
105 | * gfs2_aspace_releasepage - free the metadata associated with a page | |
106 | * @page: the page that's being released | |
107 | * @gfp_mask: passed from Linux VFS, ignored by us | |
108 | * | |
109 | * Call try_to_free_buffers() if the buffers in this page can be | |
110 | * released. | |
111 | * | |
112 | * Returns: 0 | |
113 | */ | |
114 | ||
115 | static int gfs2_aspace_releasepage(struct page *page, gfp_t gfp_mask) | |
116 | { | |
117 | struct inode *aspace = page->mapping->host; | |
5c676f6d | 118 | struct gfs2_sbd *sdp = aspace->i_sb->s_fs_info; |
b3b94faa DT |
119 | struct buffer_head *bh, *head; |
120 | struct gfs2_bufdata *bd; | |
121 | unsigned long t; | |
122 | ||
123 | if (!page_has_buffers(page)) | |
124 | goto out; | |
125 | ||
126 | head = bh = page_buffers(page); | |
127 | do { | |
128 | t = jiffies; | |
129 | ||
130 | while (atomic_read(&bh->b_count)) { | |
131 | if (atomic_read(&aspace->i_writecount)) { | |
132 | if (time_after_eq(jiffies, t + | |
133 | gfs2_tune_get(sdp, gt_stall_secs) * HZ)) { | |
134 | stuck_releasepage(bh); | |
135 | t = jiffies; | |
136 | } | |
137 | ||
138 | yield(); | |
139 | continue; | |
140 | } | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
145 | gfs2_assert_warn(sdp, !buffer_pinned(bh)); | |
146 | ||
5c676f6d | 147 | bd = bh->b_private; |
b3b94faa DT |
148 | if (bd) { |
149 | gfs2_assert_warn(sdp, bd->bd_bh == bh); | |
150 | gfs2_assert_warn(sdp, list_empty(&bd->bd_list_tr)); | |
151 | gfs2_assert_warn(sdp, list_empty(&bd->bd_le.le_list)); | |
152 | gfs2_assert_warn(sdp, !bd->bd_ail); | |
153 | kmem_cache_free(gfs2_bufdata_cachep, bd); | |
5c676f6d | 154 | bh->b_private = NULL; |
b3b94faa DT |
155 | } |
156 | ||
157 | bh = bh->b_this_page; | |
158 | } | |
159 | while (bh != head); | |
160 | ||
161 | out: | |
162 | return try_to_free_buffers(page); | |
163 | } | |
164 | ||
165 | static struct address_space_operations aspace_aops = { | |
166 | .writepage = gfs2_aspace_writepage, | |
167 | .releasepage = gfs2_aspace_releasepage, | |
168 | }; | |
169 | ||
170 | /** | |
171 | * gfs2_aspace_get - Create and initialize a struct inode structure | |
172 | * @sdp: the filesystem the aspace is in | |
173 | * | |
174 | * Right now a struct inode is just a struct inode. Maybe Linux | |
175 | * will supply a more lightweight address space construct (that works) | |
176 | * in the future. | |
177 | * | |
178 | * Make sure pages/buffers in this aspace aren't in high memory. | |
179 | * | |
180 | * Returns: the aspace | |
181 | */ | |
182 | ||
183 | struct inode *gfs2_aspace_get(struct gfs2_sbd *sdp) | |
184 | { | |
185 | struct inode *aspace; | |
186 | ||
187 | aspace = new_inode(sdp->sd_vfs); | |
188 | if (aspace) { | |
189 | mapping_set_gfp_mask(aspace->i_mapping, GFP_KERNEL); | |
190 | aspace->i_mapping->a_ops = &aspace_aops; | |
191 | aspace->i_size = ~0ULL; | |
5c676f6d | 192 | aspace->u.generic_ip = NULL; |
b3b94faa DT |
193 | insert_inode_hash(aspace); |
194 | } | |
b3b94faa DT |
195 | return aspace; |
196 | } | |
197 | ||
198 | void gfs2_aspace_put(struct inode *aspace) | |
199 | { | |
200 | remove_inode_hash(aspace); | |
201 | iput(aspace); | |
202 | } | |
203 | ||
204 | /** | |
205 | * gfs2_ail1_start_one - Start I/O on a part of the AIL | |
206 | * @sdp: the filesystem | |
207 | * @tr: the part of the AIL | |
208 | * | |
209 | */ | |
210 | ||
211 | void gfs2_ail1_start_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai) | |
212 | { | |
213 | struct gfs2_bufdata *bd, *s; | |
214 | struct buffer_head *bh; | |
215 | int retry; | |
216 | ||
190562bd SW |
217 | BUG_ON(!spin_is_locked(&sdp->sd_log_lock)); |
218 | ||
b3b94faa DT |
219 | do { |
220 | retry = 0; | |
221 | ||
222 | list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, | |
223 | bd_ail_st_list) { | |
224 | bh = bd->bd_bh; | |
225 | ||
226 | gfs2_assert(sdp, bd->bd_ail == ai); | |
227 | ||
228 | if (!buffer_busy(bh)) { | |
229 | if (!buffer_uptodate(bh)) | |
230 | gfs2_io_error_bh(sdp, bh); | |
231 | list_move(&bd->bd_ail_st_list, | |
232 | &ai->ai_ail2_list); | |
233 | continue; | |
234 | } | |
235 | ||
236 | if (!buffer_dirty(bh)) | |
237 | continue; | |
238 | ||
239 | list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list); | |
240 | ||
241 | gfs2_log_unlock(sdp); | |
242 | wait_on_buffer(bh); | |
243 | ll_rw_block(WRITE, 1, &bh); | |
244 | gfs2_log_lock(sdp); | |
245 | ||
246 | retry = 1; | |
247 | break; | |
248 | } | |
249 | } while (retry); | |
250 | } | |
251 | ||
252 | /** | |
253 | * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced | |
254 | * @sdp: the filesystem | |
255 | * @ai: the AIL entry | |
256 | * | |
257 | */ | |
258 | ||
259 | int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai, int flags) | |
260 | { | |
261 | struct gfs2_bufdata *bd, *s; | |
262 | struct buffer_head *bh; | |
263 | ||
264 | list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, | |
265 | bd_ail_st_list) { | |
266 | bh = bd->bd_bh; | |
267 | ||
268 | gfs2_assert(sdp, bd->bd_ail == ai); | |
269 | ||
270 | if (buffer_busy(bh)) { | |
271 | if (flags & DIO_ALL) | |
272 | continue; | |
273 | else | |
274 | break; | |
275 | } | |
276 | ||
277 | if (!buffer_uptodate(bh)) | |
278 | gfs2_io_error_bh(sdp, bh); | |
279 | ||
280 | list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list); | |
281 | } | |
282 | ||
283 | return list_empty(&ai->ai_ail1_list); | |
284 | } | |
285 | ||
286 | /** | |
287 | * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced | |
288 | * @sdp: the filesystem | |
289 | * @ai: the AIL entry | |
290 | * | |
291 | */ | |
292 | ||
293 | void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai) | |
294 | { | |
295 | struct list_head *head = &ai->ai_ail2_list; | |
296 | struct gfs2_bufdata *bd; | |
297 | ||
298 | while (!list_empty(head)) { | |
299 | bd = list_entry(head->prev, struct gfs2_bufdata, | |
300 | bd_ail_st_list); | |
301 | gfs2_assert(sdp, bd->bd_ail == ai); | |
302 | bd->bd_ail = NULL; | |
303 | list_del(&bd->bd_ail_st_list); | |
304 | list_del(&bd->bd_ail_gl_list); | |
305 | atomic_dec(&bd->bd_gl->gl_ail_count); | |
306 | brelse(bd->bd_bh); | |
307 | } | |
308 | } | |
309 | ||
310 | /** | |
311 | * ail_empty_gl - remove all buffers for a given lock from the AIL | |
312 | * @gl: the glock | |
313 | * | |
314 | * None of the buffers should be dirty, locked, or pinned. | |
315 | */ | |
316 | ||
317 | void gfs2_ail_empty_gl(struct gfs2_glock *gl) | |
318 | { | |
319 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
320 | unsigned int blocks; | |
321 | struct list_head *head = &gl->gl_ail_list; | |
322 | struct gfs2_bufdata *bd; | |
323 | struct buffer_head *bh; | |
324 | uint64_t blkno; | |
325 | int error; | |
326 | ||
327 | blocks = atomic_read(&gl->gl_ail_count); | |
328 | if (!blocks) | |
329 | return; | |
330 | ||
331 | error = gfs2_trans_begin(sdp, 0, blocks); | |
332 | if (gfs2_assert_withdraw(sdp, !error)) | |
333 | return; | |
334 | ||
335 | gfs2_log_lock(sdp); | |
336 | while (!list_empty(head)) { | |
337 | bd = list_entry(head->next, struct gfs2_bufdata, | |
338 | bd_ail_gl_list); | |
339 | bh = bd->bd_bh; | |
340 | blkno = bh->b_blocknr; | |
341 | gfs2_assert_withdraw(sdp, !buffer_busy(bh)); | |
342 | ||
343 | bd->bd_ail = NULL; | |
344 | list_del(&bd->bd_ail_st_list); | |
345 | list_del(&bd->bd_ail_gl_list); | |
346 | atomic_dec(&gl->gl_ail_count); | |
347 | brelse(bh); | |
348 | gfs2_log_unlock(sdp); | |
349 | ||
350 | gfs2_trans_add_revoke(sdp, blkno); | |
351 | ||
352 | gfs2_log_lock(sdp); | |
353 | } | |
354 | gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count)); | |
355 | gfs2_log_unlock(sdp); | |
356 | ||
357 | gfs2_trans_end(sdp); | |
b09e593d | 358 | gfs2_log_flush(sdp, NULL); |
b3b94faa DT |
359 | } |
360 | ||
361 | /** | |
362 | * gfs2_meta_inval - Invalidate all buffers associated with a glock | |
363 | * @gl: the glock | |
364 | * | |
365 | */ | |
366 | ||
367 | void gfs2_meta_inval(struct gfs2_glock *gl) | |
368 | { | |
369 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
370 | struct inode *aspace = gl->gl_aspace; | |
371 | struct address_space *mapping = gl->gl_aspace->i_mapping; | |
372 | ||
373 | gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count)); | |
374 | ||
375 | atomic_inc(&aspace->i_writecount); | |
376 | truncate_inode_pages(mapping, 0); | |
377 | atomic_dec(&aspace->i_writecount); | |
378 | ||
379 | gfs2_assert_withdraw(sdp, !mapping->nrpages); | |
380 | } | |
381 | ||
382 | /** | |
383 | * gfs2_meta_sync - Sync all buffers associated with a glock | |
384 | * @gl: The glock | |
385 | * @flags: DIO_START | DIO_WAIT | |
386 | * | |
387 | */ | |
388 | ||
389 | void gfs2_meta_sync(struct gfs2_glock *gl, int flags) | |
390 | { | |
391 | struct address_space *mapping = gl->gl_aspace->i_mapping; | |
392 | int error = 0; | |
393 | ||
394 | if (flags & DIO_START) | |
395 | filemap_fdatawrite(mapping); | |
396 | if (!error && (flags & DIO_WAIT)) | |
397 | error = filemap_fdatawait(mapping); | |
398 | ||
399 | if (error) | |
400 | gfs2_io_error(gl->gl_sbd); | |
401 | } | |
402 | ||
403 | /** | |
404 | * getbuf - Get a buffer with a given address space | |
405 | * @sdp: the filesystem | |
406 | * @aspace: the address space | |
407 | * @blkno: the block number (filesystem scope) | |
408 | * @create: 1 if the buffer should be created | |
409 | * | |
410 | * Returns: the buffer | |
411 | */ | |
412 | ||
413 | static struct buffer_head *getbuf(struct gfs2_sbd *sdp, struct inode *aspace, | |
414 | uint64_t blkno, int create) | |
415 | { | |
416 | struct page *page; | |
417 | struct buffer_head *bh; | |
418 | unsigned int shift; | |
419 | unsigned long index; | |
420 | unsigned int bufnum; | |
421 | ||
422 | shift = PAGE_CACHE_SHIFT - sdp->sd_sb.sb_bsize_shift; | |
423 | index = blkno >> shift; /* convert block to page */ | |
424 | bufnum = blkno - (index << shift); /* block buf index within page */ | |
425 | ||
426 | if (create) { | |
427 | for (;;) { | |
428 | page = grab_cache_page(aspace->i_mapping, index); | |
429 | if (page) | |
430 | break; | |
431 | yield(); | |
432 | } | |
433 | } else { | |
434 | page = find_lock_page(aspace->i_mapping, index); | |
435 | if (!page) | |
436 | return NULL; | |
437 | } | |
438 | ||
439 | if (!page_has_buffers(page)) | |
440 | create_empty_buffers(page, sdp->sd_sb.sb_bsize, 0); | |
441 | ||
442 | /* Locate header for our buffer within our page */ | |
443 | for (bh = page_buffers(page); bufnum--; bh = bh->b_this_page) | |
444 | /* Do nothing */; | |
445 | get_bh(bh); | |
446 | ||
447 | if (!buffer_mapped(bh)) | |
448 | map_bh(bh, sdp->sd_vfs, blkno); | |
449 | ||
450 | unlock_page(page); | |
451 | mark_page_accessed(page); | |
452 | page_cache_release(page); | |
453 | ||
454 | return bh; | |
455 | } | |
456 | ||
457 | static void meta_prep_new(struct buffer_head *bh) | |
458 | { | |
459 | struct gfs2_meta_header *mh = (struct gfs2_meta_header *)bh->b_data; | |
460 | ||
461 | lock_buffer(bh); | |
462 | clear_buffer_dirty(bh); | |
463 | set_buffer_uptodate(bh); | |
464 | unlock_buffer(bh); | |
465 | ||
466 | mh->mh_magic = cpu_to_be32(GFS2_MAGIC); | |
467 | } | |
468 | ||
469 | /** | |
470 | * gfs2_meta_new - Get a block | |
471 | * @gl: The glock associated with this block | |
472 | * @blkno: The block number | |
473 | * | |
474 | * Returns: The buffer | |
475 | */ | |
476 | ||
477 | struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, uint64_t blkno) | |
478 | { | |
479 | struct buffer_head *bh; | |
480 | bh = getbuf(gl->gl_sbd, gl->gl_aspace, blkno, CREATE); | |
481 | meta_prep_new(bh); | |
482 | return bh; | |
483 | } | |
484 | ||
485 | /** | |
486 | * gfs2_meta_read - Read a block from disk | |
487 | * @gl: The glock covering the block | |
488 | * @blkno: The block number | |
489 | * @flags: flags to gfs2_dreread() | |
490 | * @bhp: the place where the buffer is returned (NULL on failure) | |
491 | * | |
492 | * Returns: errno | |
493 | */ | |
494 | ||
495 | int gfs2_meta_read(struct gfs2_glock *gl, uint64_t blkno, int flags, | |
496 | struct buffer_head **bhp) | |
497 | { | |
498 | int error; | |
499 | ||
500 | *bhp = getbuf(gl->gl_sbd, gl->gl_aspace, blkno, CREATE); | |
501 | error = gfs2_meta_reread(gl->gl_sbd, *bhp, flags); | |
502 | if (error) | |
503 | brelse(*bhp); | |
504 | ||
505 | return error; | |
506 | } | |
507 | ||
508 | /** | |
509 | * gfs2_meta_reread - Reread a block from disk | |
510 | * @sdp: the filesystem | |
511 | * @bh: The block to read | |
512 | * @flags: Flags that control the read | |
513 | * | |
514 | * Returns: errno | |
515 | */ | |
516 | ||
517 | int gfs2_meta_reread(struct gfs2_sbd *sdp, struct buffer_head *bh, int flags) | |
518 | { | |
519 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
520 | return -EIO; | |
521 | ||
522 | if (flags & DIO_FORCE) | |
523 | clear_buffer_uptodate(bh); | |
524 | ||
525 | if ((flags & DIO_START) && !buffer_uptodate(bh)) | |
526 | ll_rw_block(READ, 1, &bh); | |
527 | ||
528 | if (flags & DIO_WAIT) { | |
529 | wait_on_buffer(bh); | |
530 | ||
531 | if (!buffer_uptodate(bh)) { | |
5c676f6d | 532 | struct gfs2_trans *tr = current->journal_info; |
b3b94faa DT |
533 | if (tr && tr->tr_touched) |
534 | gfs2_io_error_bh(sdp, bh); | |
535 | return -EIO; | |
536 | } | |
537 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
538 | return -EIO; | |
539 | } | |
540 | ||
541 | return 0; | |
542 | } | |
543 | ||
544 | /** | |
586dfdaa | 545 | * gfs2_attach_bufdata - attach a struct gfs2_bufdata structure to a buffer |
b3b94faa DT |
546 | * @gl: the glock the buffer belongs to |
547 | * @bh: The buffer to be attached to | |
586dfdaa | 548 | * @meta: Flag to indicate whether its metadata or not |
b3b94faa DT |
549 | */ |
550 | ||
568f4c96 SW |
551 | void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh, |
552 | int meta) | |
b3b94faa DT |
553 | { |
554 | struct gfs2_bufdata *bd; | |
555 | ||
18ec7d5c SW |
556 | if (meta) |
557 | lock_page(bh->b_page); | |
b3b94faa | 558 | |
5c676f6d | 559 | if (bh->b_private) { |
18ec7d5c SW |
560 | if (meta) |
561 | unlock_page(bh->b_page); | |
b3b94faa DT |
562 | return; |
563 | } | |
564 | ||
f55ab26a | 565 | bd = kmem_cache_alloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL), |
b3b94faa DT |
566 | memset(bd, 0, sizeof(struct gfs2_bufdata)); |
567 | ||
568 | bd->bd_bh = bh; | |
569 | bd->bd_gl = gl; | |
570 | ||
571 | INIT_LIST_HEAD(&bd->bd_list_tr); | |
18ec7d5c | 572 | if (meta) { |
586dfdaa | 573 | lops_init_le(&bd->bd_le, &gfs2_buf_lops); |
18ec7d5c | 574 | } else { |
586dfdaa | 575 | lops_init_le(&bd->bd_le, &gfs2_databuf_lops); |
18ec7d5c SW |
576 | get_bh(bh); |
577 | } | |
5c676f6d | 578 | bh->b_private = bd; |
b3b94faa | 579 | |
18ec7d5c SW |
580 | if (meta) |
581 | unlock_page(bh->b_page); | |
b3b94faa DT |
582 | } |
583 | ||
584 | /** | |
a98ab220 | 585 | * gfs2_pin - Pin a buffer in memory |
b3b94faa DT |
586 | * @sdp: the filesystem the buffer belongs to |
587 | * @bh: The buffer to be pinned | |
588 | * | |
589 | */ | |
590 | ||
a98ab220 | 591 | void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh) |
b3b94faa | 592 | { |
5c676f6d | 593 | struct gfs2_bufdata *bd = bh->b_private; |
b3b94faa DT |
594 | |
595 | gfs2_assert_withdraw(sdp, test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)); | |
596 | ||
597 | if (test_set_buffer_pinned(bh)) | |
598 | gfs2_assert_withdraw(sdp, 0); | |
599 | ||
600 | wait_on_buffer(bh); | |
601 | ||
602 | /* If this buffer is in the AIL and it has already been written | |
603 | to in-place disk block, remove it from the AIL. */ | |
604 | ||
605 | gfs2_log_lock(sdp); | |
606 | if (bd->bd_ail && !buffer_in_io(bh)) | |
607 | list_move(&bd->bd_ail_st_list, &bd->bd_ail->ai_ail2_list); | |
608 | gfs2_log_unlock(sdp); | |
609 | ||
610 | clear_buffer_dirty(bh); | |
611 | wait_on_buffer(bh); | |
612 | ||
613 | if (!buffer_uptodate(bh)) | |
614 | gfs2_io_error_bh(sdp, bh); | |
615 | ||
616 | get_bh(bh); | |
617 | } | |
618 | ||
619 | /** | |
a98ab220 | 620 | * gfs2_unpin - Unpin a buffer |
b3b94faa DT |
621 | * @sdp: the filesystem the buffer belongs to |
622 | * @bh: The buffer to unpin | |
623 | * @ai: | |
624 | * | |
625 | */ | |
626 | ||
a98ab220 SW |
627 | void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh, |
628 | struct gfs2_ail *ai) | |
b3b94faa | 629 | { |
5c676f6d | 630 | struct gfs2_bufdata *bd = bh->b_private; |
b3b94faa DT |
631 | |
632 | gfs2_assert_withdraw(sdp, buffer_uptodate(bh)); | |
633 | ||
634 | if (!buffer_pinned(bh)) | |
635 | gfs2_assert_withdraw(sdp, 0); | |
636 | ||
637 | mark_buffer_dirty(bh); | |
638 | clear_buffer_pinned(bh); | |
639 | ||
640 | gfs2_log_lock(sdp); | |
641 | if (bd->bd_ail) { | |
642 | list_del(&bd->bd_ail_st_list); | |
643 | brelse(bh); | |
644 | } else { | |
645 | struct gfs2_glock *gl = bd->bd_gl; | |
646 | list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list); | |
647 | atomic_inc(&gl->gl_ail_count); | |
648 | } | |
649 | bd->bd_ail = ai; | |
650 | list_add(&bd->bd_ail_st_list, &ai->ai_ail1_list); | |
651 | gfs2_log_unlock(sdp); | |
652 | } | |
653 | ||
654 | /** | |
655 | * gfs2_meta_wipe - make inode's buffers so they aren't dirty/pinned anymore | |
656 | * @ip: the inode who owns the buffers | |
657 | * @bstart: the first buffer in the run | |
658 | * @blen: the number of buffers in the run | |
659 | * | |
660 | */ | |
661 | ||
662 | void gfs2_meta_wipe(struct gfs2_inode *ip, uint64_t bstart, uint32_t blen) | |
663 | { | |
664 | struct gfs2_sbd *sdp = ip->i_sbd; | |
665 | struct inode *aspace = ip->i_gl->gl_aspace; | |
666 | struct buffer_head *bh; | |
667 | ||
668 | while (blen) { | |
669 | bh = getbuf(sdp, aspace, bstart, NO_CREATE); | |
670 | if (bh) { | |
5c676f6d | 671 | struct gfs2_bufdata *bd = bh->b_private; |
b3b94faa DT |
672 | |
673 | if (test_clear_buffer_pinned(bh)) { | |
5c676f6d | 674 | struct gfs2_trans *tr = current->journal_info; |
b3b94faa DT |
675 | gfs2_log_lock(sdp); |
676 | list_del_init(&bd->bd_le.le_list); | |
677 | gfs2_assert_warn(sdp, sdp->sd_log_num_buf); | |
678 | sdp->sd_log_num_buf--; | |
679 | gfs2_log_unlock(sdp); | |
5c676f6d | 680 | tr->tr_num_buf_rm++; |
b3b94faa DT |
681 | brelse(bh); |
682 | } | |
683 | if (bd) { | |
684 | gfs2_log_lock(sdp); | |
685 | if (bd->bd_ail) { | |
686 | uint64_t blkno = bh->b_blocknr; | |
687 | bd->bd_ail = NULL; | |
688 | list_del(&bd->bd_ail_st_list); | |
689 | list_del(&bd->bd_ail_gl_list); | |
690 | atomic_dec(&bd->bd_gl->gl_ail_count); | |
691 | brelse(bh); | |
692 | gfs2_log_unlock(sdp); | |
693 | gfs2_trans_add_revoke(sdp, blkno); | |
694 | } else | |
695 | gfs2_log_unlock(sdp); | |
696 | } | |
697 | ||
698 | lock_buffer(bh); | |
699 | clear_buffer_dirty(bh); | |
700 | clear_buffer_uptodate(bh); | |
701 | unlock_buffer(bh); | |
702 | ||
703 | brelse(bh); | |
704 | } | |
705 | ||
706 | bstart++; | |
707 | blen--; | |
708 | } | |
709 | } | |
710 | ||
711 | /** | |
712 | * gfs2_meta_cache_flush - get rid of any references on buffers for this inode | |
713 | * @ip: The GFS2 inode | |
714 | * | |
715 | * This releases buffers that are in the most-recently-used array of | |
716 | * blocks used for indirect block addressing for this inode. | |
717 | */ | |
718 | ||
719 | void gfs2_meta_cache_flush(struct gfs2_inode *ip) | |
720 | { | |
721 | struct buffer_head **bh_slot; | |
722 | unsigned int x; | |
723 | ||
724 | spin_lock(&ip->i_spin); | |
725 | ||
726 | for (x = 0; x < GFS2_MAX_META_HEIGHT; x++) { | |
727 | bh_slot = &ip->i_cache[x]; | |
728 | if (!*bh_slot) | |
729 | break; | |
730 | brelse(*bh_slot); | |
731 | *bh_slot = NULL; | |
732 | } | |
733 | ||
734 | spin_unlock(&ip->i_spin); | |
735 | } | |
736 | ||
737 | /** | |
738 | * gfs2_meta_indirect_buffer - Get a metadata buffer | |
739 | * @ip: The GFS2 inode | |
740 | * @height: The level of this buf in the metadata (indir addr) tree (if any) | |
741 | * @num: The block number (device relative) of the buffer | |
742 | * @new: Non-zero if we may create a new buffer | |
743 | * @bhp: the buffer is returned here | |
744 | * | |
745 | * Try to use the gfs2_inode's MRU metadata tree cache. | |
746 | * | |
747 | * Returns: errno | |
748 | */ | |
749 | ||
750 | int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, uint64_t num, | |
751 | int new, struct buffer_head **bhp) | |
752 | { | |
753 | struct buffer_head *bh, **bh_slot = ip->i_cache + height; | |
754 | int error; | |
755 | ||
756 | spin_lock(&ip->i_spin); | |
757 | bh = *bh_slot; | |
758 | if (bh) { | |
759 | if (bh->b_blocknr == num) | |
760 | get_bh(bh); | |
761 | else | |
762 | bh = NULL; | |
763 | } | |
764 | spin_unlock(&ip->i_spin); | |
765 | ||
766 | if (bh) { | |
767 | if (new) | |
768 | meta_prep_new(bh); | |
769 | else { | |
770 | error = gfs2_meta_reread(ip->i_sbd, bh, | |
771 | DIO_START | DIO_WAIT); | |
772 | if (error) { | |
773 | brelse(bh); | |
774 | return error; | |
775 | } | |
776 | } | |
777 | } else { | |
778 | if (new) | |
779 | bh = gfs2_meta_new(ip->i_gl, num); | |
780 | else { | |
781 | error = gfs2_meta_read(ip->i_gl, num, | |
782 | DIO_START | DIO_WAIT, &bh); | |
783 | if (error) | |
784 | return error; | |
785 | } | |
786 | ||
787 | spin_lock(&ip->i_spin); | |
788 | if (*bh_slot != bh) { | |
789 | brelse(*bh_slot); | |
790 | *bh_slot = bh; | |
791 | get_bh(bh); | |
792 | } | |
793 | spin_unlock(&ip->i_spin); | |
794 | } | |
795 | ||
796 | if (new) { | |
797 | if (gfs2_assert_warn(ip->i_sbd, height)) { | |
798 | brelse(bh); | |
799 | return -EIO; | |
800 | } | |
d4e9c4c3 | 801 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
802 | gfs2_metatype_set(bh, GFS2_METATYPE_IN, GFS2_FORMAT_IN); |
803 | gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); | |
804 | ||
805 | } else if (gfs2_metatype_check(ip->i_sbd, bh, | |
806 | (height) ? GFS2_METATYPE_IN : GFS2_METATYPE_DI)) { | |
807 | brelse(bh); | |
808 | return -EIO; | |
809 | } | |
810 | ||
811 | *bhp = bh; | |
812 | ||
813 | return 0; | |
814 | } | |
815 | ||
816 | /** | |
817 | * gfs2_meta_ra - start readahead on an extent of a file | |
818 | * @gl: the glock the blocks belong to | |
819 | * @dblock: the starting disk block | |
820 | * @extlen: the number of blocks in the extent | |
821 | * | |
822 | */ | |
823 | ||
824 | void gfs2_meta_ra(struct gfs2_glock *gl, uint64_t dblock, uint32_t extlen) | |
825 | { | |
826 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
827 | struct inode *aspace = gl->gl_aspace; | |
828 | struct buffer_head *first_bh, *bh; | |
568f4c96 SW |
829 | uint32_t max_ra = gfs2_tune_get(sdp, gt_max_readahead) >> |
830 | sdp->sd_sb.sb_bsize_shift; | |
b3b94faa DT |
831 | int error; |
832 | ||
833 | if (!extlen || !max_ra) | |
834 | return; | |
835 | if (extlen > max_ra) | |
836 | extlen = max_ra; | |
837 | ||
838 | first_bh = getbuf(sdp, aspace, dblock, CREATE); | |
839 | ||
840 | if (buffer_uptodate(first_bh)) | |
841 | goto out; | |
842 | if (!buffer_locked(first_bh)) { | |
843 | error = gfs2_meta_reread(sdp, first_bh, DIO_START); | |
844 | if (error) | |
845 | goto out; | |
846 | } | |
847 | ||
848 | dblock++; | |
849 | extlen--; | |
850 | ||
851 | while (extlen) { | |
852 | bh = getbuf(sdp, aspace, dblock, CREATE); | |
853 | ||
854 | if (!buffer_uptodate(bh) && !buffer_locked(bh)) { | |
855 | error = gfs2_meta_reread(sdp, bh, DIO_START); | |
856 | brelse(bh); | |
857 | if (error) | |
858 | goto out; | |
859 | } else | |
860 | brelse(bh); | |
861 | ||
862 | dblock++; | |
863 | extlen--; | |
864 | ||
865 | if (buffer_uptodate(first_bh)) | |
866 | break; | |
867 | } | |
868 | ||
869 | out: | |
870 | brelse(first_bh); | |
871 | } | |
872 | ||
873 | /** | |
874 | * gfs2_meta_syncfs - sync all the buffers in a filesystem | |
875 | * @sdp: the filesystem | |
876 | * | |
877 | */ | |
878 | ||
879 | void gfs2_meta_syncfs(struct gfs2_sbd *sdp) | |
880 | { | |
b09e593d | 881 | gfs2_log_flush(sdp, NULL); |
b3b94faa DT |
882 | for (;;) { |
883 | gfs2_ail1_start(sdp, DIO_ALL); | |
884 | if (gfs2_ail1_empty(sdp, DIO_ALL)) | |
885 | break; | |
fe1bdedc | 886 | msleep(10); |
b3b94faa DT |
887 | } |
888 | } | |
889 |