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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> |
7d308590 | 21 | #include <linux/lm_interface.h> |
b3b94faa DT |
22 | |
23 | #include "gfs2.h" | |
5c676f6d | 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 | } | |
56965536 | 123 | list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list); |
b3b94faa DT |
124 | continue; |
125 | } | |
126 | ||
127 | if (!buffer_dirty(bh)) | |
128 | continue; | |
129 | ||
130 | list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list); | |
131 | ||
132 | gfs2_log_unlock(sdp); | |
133 | wait_on_buffer(bh); | |
134 | ll_rw_block(WRITE, 1, &bh); | |
135 | gfs2_log_lock(sdp); | |
136 | ||
137 | retry = 1; | |
138 | break; | |
139 | } | |
140 | } while (retry); | |
141 | } | |
142 | ||
143 | /** | |
144 | * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced | |
145 | * @sdp: the filesystem | |
146 | * @ai: the AIL entry | |
147 | * | |
148 | */ | |
149 | ||
150 | int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai, int flags) | |
151 | { | |
152 | struct gfs2_bufdata *bd, *s; | |
153 | struct buffer_head *bh; | |
154 | ||
155 | list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, | |
156 | bd_ail_st_list) { | |
157 | bh = bd->bd_bh; | |
158 | ||
159 | gfs2_assert(sdp, bd->bd_ail == ai); | |
160 | ||
161 | if (buffer_busy(bh)) { | |
162 | if (flags & DIO_ALL) | |
163 | continue; | |
164 | else | |
165 | break; | |
166 | } | |
167 | ||
168 | if (!buffer_uptodate(bh)) | |
169 | gfs2_io_error_bh(sdp, bh); | |
170 | ||
171 | list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list); | |
172 | } | |
173 | ||
174 | return list_empty(&ai->ai_ail1_list); | |
175 | } | |
176 | ||
177 | /** | |
178 | * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced | |
179 | * @sdp: the filesystem | |
180 | * @ai: the AIL entry | |
181 | * | |
182 | */ | |
183 | ||
184 | void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai) | |
185 | { | |
186 | struct list_head *head = &ai->ai_ail2_list; | |
187 | struct gfs2_bufdata *bd; | |
188 | ||
189 | while (!list_empty(head)) { | |
190 | bd = list_entry(head->prev, struct gfs2_bufdata, | |
191 | bd_ail_st_list); | |
192 | gfs2_assert(sdp, bd->bd_ail == ai); | |
193 | bd->bd_ail = NULL; | |
194 | list_del(&bd->bd_ail_st_list); | |
195 | list_del(&bd->bd_ail_gl_list); | |
196 | atomic_dec(&bd->bd_gl->gl_ail_count); | |
197 | brelse(bd->bd_bh); | |
198 | } | |
199 | } | |
200 | ||
201 | /** | |
202 | * ail_empty_gl - remove all buffers for a given lock from the AIL | |
203 | * @gl: the glock | |
204 | * | |
205 | * None of the buffers should be dirty, locked, or pinned. | |
206 | */ | |
207 | ||
208 | void gfs2_ail_empty_gl(struct gfs2_glock *gl) | |
209 | { | |
210 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
211 | unsigned int blocks; | |
212 | struct list_head *head = &gl->gl_ail_list; | |
213 | struct gfs2_bufdata *bd; | |
214 | struct buffer_head *bh; | |
cd915493 | 215 | u64 blkno; |
b3b94faa DT |
216 | int error; |
217 | ||
218 | blocks = atomic_read(&gl->gl_ail_count); | |
219 | if (!blocks) | |
220 | return; | |
221 | ||
222 | error = gfs2_trans_begin(sdp, 0, blocks); | |
223 | if (gfs2_assert_withdraw(sdp, !error)) | |
224 | return; | |
225 | ||
226 | gfs2_log_lock(sdp); | |
227 | while (!list_empty(head)) { | |
228 | bd = list_entry(head->next, struct gfs2_bufdata, | |
229 | bd_ail_gl_list); | |
230 | bh = bd->bd_bh; | |
231 | blkno = bh->b_blocknr; | |
232 | gfs2_assert_withdraw(sdp, !buffer_busy(bh)); | |
233 | ||
234 | bd->bd_ail = NULL; | |
235 | list_del(&bd->bd_ail_st_list); | |
236 | list_del(&bd->bd_ail_gl_list); | |
237 | atomic_dec(&gl->gl_ail_count); | |
238 | brelse(bh); | |
239 | gfs2_log_unlock(sdp); | |
240 | ||
241 | gfs2_trans_add_revoke(sdp, blkno); | |
242 | ||
243 | gfs2_log_lock(sdp); | |
244 | } | |
245 | gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count)); | |
246 | gfs2_log_unlock(sdp); | |
247 | ||
248 | gfs2_trans_end(sdp); | |
b09e593d | 249 | gfs2_log_flush(sdp, NULL); |
b3b94faa DT |
250 | } |
251 | ||
252 | /** | |
253 | * gfs2_meta_inval - Invalidate all buffers associated with a glock | |
254 | * @gl: the glock | |
255 | * | |
256 | */ | |
257 | ||
258 | void gfs2_meta_inval(struct gfs2_glock *gl) | |
259 | { | |
260 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
261 | struct inode *aspace = gl->gl_aspace; | |
262 | struct address_space *mapping = gl->gl_aspace->i_mapping; | |
263 | ||
264 | gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count)); | |
265 | ||
266 | atomic_inc(&aspace->i_writecount); | |
267 | truncate_inode_pages(mapping, 0); | |
268 | atomic_dec(&aspace->i_writecount); | |
269 | ||
270 | gfs2_assert_withdraw(sdp, !mapping->nrpages); | |
271 | } | |
272 | ||
273 | /** | |
274 | * gfs2_meta_sync - Sync all buffers associated with a glock | |
275 | * @gl: The glock | |
276 | * @flags: DIO_START | DIO_WAIT | |
277 | * | |
278 | */ | |
279 | ||
280 | void gfs2_meta_sync(struct gfs2_glock *gl, int flags) | |
281 | { | |
282 | struct address_space *mapping = gl->gl_aspace->i_mapping; | |
283 | int error = 0; | |
284 | ||
285 | if (flags & DIO_START) | |
286 | filemap_fdatawrite(mapping); | |
287 | if (!error && (flags & DIO_WAIT)) | |
288 | error = filemap_fdatawait(mapping); | |
289 | ||
290 | if (error) | |
291 | gfs2_io_error(gl->gl_sbd); | |
292 | } | |
293 | ||
294 | /** | |
295 | * getbuf - Get a buffer with a given address space | |
296 | * @sdp: the filesystem | |
297 | * @aspace: the address space | |
298 | * @blkno: the block number (filesystem scope) | |
299 | * @create: 1 if the buffer should be created | |
300 | * | |
301 | * Returns: the buffer | |
302 | */ | |
303 | ||
304 | static struct buffer_head *getbuf(struct gfs2_sbd *sdp, struct inode *aspace, | |
cd915493 | 305 | u64 blkno, int create) |
b3b94faa DT |
306 | { |
307 | struct page *page; | |
308 | struct buffer_head *bh; | |
309 | unsigned int shift; | |
310 | unsigned long index; | |
311 | unsigned int bufnum; | |
312 | ||
313 | shift = PAGE_CACHE_SHIFT - sdp->sd_sb.sb_bsize_shift; | |
314 | index = blkno >> shift; /* convert block to page */ | |
315 | bufnum = blkno - (index << shift); /* block buf index within page */ | |
316 | ||
317 | if (create) { | |
318 | for (;;) { | |
319 | page = grab_cache_page(aspace->i_mapping, index); | |
320 | if (page) | |
321 | break; | |
322 | yield(); | |
323 | } | |
324 | } else { | |
325 | page = find_lock_page(aspace->i_mapping, index); | |
326 | if (!page) | |
327 | return NULL; | |
328 | } | |
329 | ||
330 | if (!page_has_buffers(page)) | |
331 | create_empty_buffers(page, sdp->sd_sb.sb_bsize, 0); | |
332 | ||
333 | /* Locate header for our buffer within our page */ | |
334 | for (bh = page_buffers(page); bufnum--; bh = bh->b_this_page) | |
335 | /* Do nothing */; | |
336 | get_bh(bh); | |
337 | ||
338 | if (!buffer_mapped(bh)) | |
339 | map_bh(bh, sdp->sd_vfs, blkno); | |
340 | ||
341 | unlock_page(page); | |
342 | mark_page_accessed(page); | |
343 | page_cache_release(page); | |
344 | ||
345 | return bh; | |
346 | } | |
347 | ||
348 | static void meta_prep_new(struct buffer_head *bh) | |
349 | { | |
350 | struct gfs2_meta_header *mh = (struct gfs2_meta_header *)bh->b_data; | |
351 | ||
352 | lock_buffer(bh); | |
353 | clear_buffer_dirty(bh); | |
354 | set_buffer_uptodate(bh); | |
355 | unlock_buffer(bh); | |
356 | ||
357 | mh->mh_magic = cpu_to_be32(GFS2_MAGIC); | |
358 | } | |
359 | ||
360 | /** | |
361 | * gfs2_meta_new - Get a block | |
362 | * @gl: The glock associated with this block | |
363 | * @blkno: The block number | |
364 | * | |
365 | * Returns: The buffer | |
366 | */ | |
367 | ||
cd915493 | 368 | struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno) |
b3b94faa DT |
369 | { |
370 | struct buffer_head *bh; | |
371 | bh = getbuf(gl->gl_sbd, gl->gl_aspace, blkno, CREATE); | |
372 | meta_prep_new(bh); | |
373 | return bh; | |
374 | } | |
375 | ||
376 | /** | |
377 | * gfs2_meta_read - Read a block from disk | |
378 | * @gl: The glock covering the block | |
379 | * @blkno: The block number | |
380 | * @flags: flags to gfs2_dreread() | |
381 | * @bhp: the place where the buffer is returned (NULL on failure) | |
382 | * | |
383 | * Returns: errno | |
384 | */ | |
385 | ||
cd915493 | 386 | int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags, |
b3b94faa DT |
387 | struct buffer_head **bhp) |
388 | { | |
389 | int error; | |
390 | ||
391 | *bhp = getbuf(gl->gl_sbd, gl->gl_aspace, blkno, CREATE); | |
392 | error = gfs2_meta_reread(gl->gl_sbd, *bhp, flags); | |
393 | if (error) | |
394 | brelse(*bhp); | |
395 | ||
396 | return error; | |
397 | } | |
398 | ||
399 | /** | |
400 | * gfs2_meta_reread - Reread a block from disk | |
401 | * @sdp: the filesystem | |
402 | * @bh: The block to read | |
403 | * @flags: Flags that control the read | |
404 | * | |
405 | * Returns: errno | |
406 | */ | |
407 | ||
408 | int gfs2_meta_reread(struct gfs2_sbd *sdp, struct buffer_head *bh, int flags) | |
409 | { | |
410 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
411 | return -EIO; | |
412 | ||
b3b94faa DT |
413 | if ((flags & DIO_START) && !buffer_uptodate(bh)) |
414 | ll_rw_block(READ, 1, &bh); | |
415 | ||
416 | if (flags & DIO_WAIT) { | |
417 | wait_on_buffer(bh); | |
418 | ||
419 | if (!buffer_uptodate(bh)) { | |
5c676f6d | 420 | struct gfs2_trans *tr = current->journal_info; |
b3b94faa DT |
421 | if (tr && tr->tr_touched) |
422 | gfs2_io_error_bh(sdp, bh); | |
423 | return -EIO; | |
424 | } | |
425 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
426 | return -EIO; | |
427 | } | |
428 | ||
429 | return 0; | |
430 | } | |
431 | ||
432 | /** | |
586dfdaa | 433 | * gfs2_attach_bufdata - attach a struct gfs2_bufdata structure to a buffer |
b3b94faa DT |
434 | * @gl: the glock the buffer belongs to |
435 | * @bh: The buffer to be attached to | |
586dfdaa | 436 | * @meta: Flag to indicate whether its metadata or not |
b3b94faa DT |
437 | */ |
438 | ||
568f4c96 SW |
439 | void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh, |
440 | int meta) | |
b3b94faa DT |
441 | { |
442 | struct gfs2_bufdata *bd; | |
443 | ||
18ec7d5c SW |
444 | if (meta) |
445 | lock_page(bh->b_page); | |
b3b94faa | 446 | |
5c676f6d | 447 | if (bh->b_private) { |
18ec7d5c SW |
448 | if (meta) |
449 | unlock_page(bh->b_page); | |
b3b94faa DT |
450 | return; |
451 | } | |
452 | ||
f55ab26a | 453 | bd = kmem_cache_alloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL), |
b3b94faa | 454 | memset(bd, 0, sizeof(struct gfs2_bufdata)); |
b3b94faa DT |
455 | bd->bd_bh = bh; |
456 | bd->bd_gl = gl; | |
457 | ||
458 | INIT_LIST_HEAD(&bd->bd_list_tr); | |
82ffa516 | 459 | if (meta) |
586dfdaa | 460 | lops_init_le(&bd->bd_le, &gfs2_buf_lops); |
82ffa516 | 461 | else |
586dfdaa | 462 | lops_init_le(&bd->bd_le, &gfs2_databuf_lops); |
5c676f6d | 463 | bh->b_private = bd; |
b3b94faa | 464 | |
18ec7d5c SW |
465 | if (meta) |
466 | unlock_page(bh->b_page); | |
b3b94faa DT |
467 | } |
468 | ||
469 | /** | |
a98ab220 | 470 | * gfs2_pin - Pin a buffer in memory |
b3b94faa DT |
471 | * @sdp: the filesystem the buffer belongs to |
472 | * @bh: The buffer to be pinned | |
473 | * | |
474 | */ | |
475 | ||
a98ab220 | 476 | void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh) |
b3b94faa | 477 | { |
5c676f6d | 478 | struct gfs2_bufdata *bd = bh->b_private; |
b3b94faa DT |
479 | |
480 | gfs2_assert_withdraw(sdp, test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)); | |
481 | ||
482 | if (test_set_buffer_pinned(bh)) | |
483 | gfs2_assert_withdraw(sdp, 0); | |
484 | ||
485 | wait_on_buffer(bh); | |
486 | ||
487 | /* If this buffer is in the AIL and it has already been written | |
488 | to in-place disk block, remove it from the AIL. */ | |
489 | ||
490 | gfs2_log_lock(sdp); | |
491 | if (bd->bd_ail && !buffer_in_io(bh)) | |
492 | list_move(&bd->bd_ail_st_list, &bd->bd_ail->ai_ail2_list); | |
493 | gfs2_log_unlock(sdp); | |
494 | ||
495 | clear_buffer_dirty(bh); | |
496 | wait_on_buffer(bh); | |
497 | ||
498 | if (!buffer_uptodate(bh)) | |
499 | gfs2_io_error_bh(sdp, bh); | |
500 | ||
501 | get_bh(bh); | |
502 | } | |
503 | ||
504 | /** | |
a98ab220 | 505 | * gfs2_unpin - Unpin a buffer |
b3b94faa DT |
506 | * @sdp: the filesystem the buffer belongs to |
507 | * @bh: The buffer to unpin | |
508 | * @ai: | |
509 | * | |
510 | */ | |
511 | ||
a98ab220 SW |
512 | void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh, |
513 | struct gfs2_ail *ai) | |
b3b94faa | 514 | { |
5c676f6d | 515 | struct gfs2_bufdata *bd = bh->b_private; |
b3b94faa DT |
516 | |
517 | gfs2_assert_withdraw(sdp, buffer_uptodate(bh)); | |
518 | ||
519 | if (!buffer_pinned(bh)) | |
520 | gfs2_assert_withdraw(sdp, 0); | |
521 | ||
522 | mark_buffer_dirty(bh); | |
523 | clear_buffer_pinned(bh); | |
524 | ||
525 | gfs2_log_lock(sdp); | |
526 | if (bd->bd_ail) { | |
527 | list_del(&bd->bd_ail_st_list); | |
528 | brelse(bh); | |
529 | } else { | |
530 | struct gfs2_glock *gl = bd->bd_gl; | |
531 | list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list); | |
532 | atomic_inc(&gl->gl_ail_count); | |
533 | } | |
534 | bd->bd_ail = ai; | |
535 | list_add(&bd->bd_ail_st_list, &ai->ai_ail1_list); | |
536 | gfs2_log_unlock(sdp); | |
537 | } | |
538 | ||
539 | /** | |
540 | * gfs2_meta_wipe - make inode's buffers so they aren't dirty/pinned anymore | |
541 | * @ip: the inode who owns the buffers | |
542 | * @bstart: the first buffer in the run | |
543 | * @blen: the number of buffers in the run | |
544 | * | |
545 | */ | |
546 | ||
cd915493 | 547 | void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen) |
b3b94faa | 548 | { |
feaa7bba | 549 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
550 | struct inode *aspace = ip->i_gl->gl_aspace; |
551 | struct buffer_head *bh; | |
552 | ||
553 | while (blen) { | |
554 | bh = getbuf(sdp, aspace, bstart, NO_CREATE); | |
555 | if (bh) { | |
5c676f6d | 556 | struct gfs2_bufdata *bd = bh->b_private; |
b3b94faa DT |
557 | |
558 | if (test_clear_buffer_pinned(bh)) { | |
5c676f6d | 559 | struct gfs2_trans *tr = current->journal_info; |
b3b94faa DT |
560 | gfs2_log_lock(sdp); |
561 | list_del_init(&bd->bd_le.le_list); | |
562 | gfs2_assert_warn(sdp, sdp->sd_log_num_buf); | |
563 | sdp->sd_log_num_buf--; | |
564 | gfs2_log_unlock(sdp); | |
5c676f6d | 565 | tr->tr_num_buf_rm++; |
b3b94faa DT |
566 | brelse(bh); |
567 | } | |
568 | if (bd) { | |
569 | gfs2_log_lock(sdp); | |
570 | if (bd->bd_ail) { | |
cd915493 | 571 | u64 blkno = bh->b_blocknr; |
b3b94faa DT |
572 | bd->bd_ail = NULL; |
573 | list_del(&bd->bd_ail_st_list); | |
574 | list_del(&bd->bd_ail_gl_list); | |
575 | atomic_dec(&bd->bd_gl->gl_ail_count); | |
576 | brelse(bh); | |
577 | gfs2_log_unlock(sdp); | |
578 | gfs2_trans_add_revoke(sdp, blkno); | |
579 | } else | |
580 | gfs2_log_unlock(sdp); | |
581 | } | |
582 | ||
583 | lock_buffer(bh); | |
584 | clear_buffer_dirty(bh); | |
585 | clear_buffer_uptodate(bh); | |
586 | unlock_buffer(bh); | |
587 | ||
588 | brelse(bh); | |
589 | } | |
590 | ||
591 | bstart++; | |
592 | blen--; | |
593 | } | |
594 | } | |
595 | ||
596 | /** | |
597 | * gfs2_meta_cache_flush - get rid of any references on buffers for this inode | |
598 | * @ip: The GFS2 inode | |
599 | * | |
600 | * This releases buffers that are in the most-recently-used array of | |
601 | * blocks used for indirect block addressing for this inode. | |
602 | */ | |
603 | ||
604 | void gfs2_meta_cache_flush(struct gfs2_inode *ip) | |
605 | { | |
606 | struct buffer_head **bh_slot; | |
607 | unsigned int x; | |
608 | ||
609 | spin_lock(&ip->i_spin); | |
610 | ||
611 | for (x = 0; x < GFS2_MAX_META_HEIGHT; x++) { | |
612 | bh_slot = &ip->i_cache[x]; | |
613 | if (!*bh_slot) | |
614 | break; | |
615 | brelse(*bh_slot); | |
616 | *bh_slot = NULL; | |
617 | } | |
618 | ||
619 | spin_unlock(&ip->i_spin); | |
620 | } | |
621 | ||
622 | /** | |
623 | * gfs2_meta_indirect_buffer - Get a metadata buffer | |
624 | * @ip: The GFS2 inode | |
625 | * @height: The level of this buf in the metadata (indir addr) tree (if any) | |
626 | * @num: The block number (device relative) of the buffer | |
627 | * @new: Non-zero if we may create a new buffer | |
628 | * @bhp: the buffer is returned here | |
629 | * | |
630 | * Try to use the gfs2_inode's MRU metadata tree cache. | |
631 | * | |
632 | * Returns: errno | |
633 | */ | |
634 | ||
cd915493 | 635 | int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num, |
b3b94faa DT |
636 | int new, struct buffer_head **bhp) |
637 | { | |
638 | struct buffer_head *bh, **bh_slot = ip->i_cache + height; | |
639 | int error; | |
640 | ||
641 | spin_lock(&ip->i_spin); | |
642 | bh = *bh_slot; | |
643 | if (bh) { | |
644 | if (bh->b_blocknr == num) | |
645 | get_bh(bh); | |
646 | else | |
647 | bh = NULL; | |
648 | } | |
649 | spin_unlock(&ip->i_spin); | |
650 | ||
651 | if (bh) { | |
652 | if (new) | |
653 | meta_prep_new(bh); | |
654 | else { | |
feaa7bba | 655 | error = gfs2_meta_reread(GFS2_SB(&ip->i_inode), bh, |
b3b94faa DT |
656 | DIO_START | DIO_WAIT); |
657 | if (error) { | |
658 | brelse(bh); | |
659 | return error; | |
660 | } | |
661 | } | |
662 | } else { | |
663 | if (new) | |
664 | bh = gfs2_meta_new(ip->i_gl, num); | |
665 | else { | |
666 | error = gfs2_meta_read(ip->i_gl, num, | |
667 | DIO_START | DIO_WAIT, &bh); | |
668 | if (error) | |
669 | return error; | |
670 | } | |
671 | ||
672 | spin_lock(&ip->i_spin); | |
673 | if (*bh_slot != bh) { | |
674 | brelse(*bh_slot); | |
675 | *bh_slot = bh; | |
676 | get_bh(bh); | |
677 | } | |
678 | spin_unlock(&ip->i_spin); | |
679 | } | |
680 | ||
681 | if (new) { | |
feaa7bba | 682 | if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), height)) { |
b3b94faa DT |
683 | brelse(bh); |
684 | return -EIO; | |
685 | } | |
d4e9c4c3 | 686 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
687 | gfs2_metatype_set(bh, GFS2_METATYPE_IN, GFS2_FORMAT_IN); |
688 | gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); | |
689 | ||
feaa7bba | 690 | } else if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, |
b3b94faa DT |
691 | (height) ? GFS2_METATYPE_IN : GFS2_METATYPE_DI)) { |
692 | brelse(bh); | |
693 | return -EIO; | |
694 | } | |
695 | ||
696 | *bhp = bh; | |
697 | ||
698 | return 0; | |
699 | } | |
700 | ||
701 | /** | |
702 | * gfs2_meta_ra - start readahead on an extent of a file | |
703 | * @gl: the glock the blocks belong to | |
704 | * @dblock: the starting disk block | |
705 | * @extlen: the number of blocks in the extent | |
706 | * | |
707 | */ | |
708 | ||
cd915493 | 709 | void gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen) |
b3b94faa DT |
710 | { |
711 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
712 | struct inode *aspace = gl->gl_aspace; | |
713 | struct buffer_head *first_bh, *bh; | |
cd915493 | 714 | u32 max_ra = gfs2_tune_get(sdp, gt_max_readahead) >> |
568f4c96 | 715 | sdp->sd_sb.sb_bsize_shift; |
b3b94faa DT |
716 | int error; |
717 | ||
718 | if (!extlen || !max_ra) | |
719 | return; | |
720 | if (extlen > max_ra) | |
721 | extlen = max_ra; | |
722 | ||
723 | first_bh = getbuf(sdp, aspace, dblock, CREATE); | |
724 | ||
725 | if (buffer_uptodate(first_bh)) | |
726 | goto out; | |
727 | if (!buffer_locked(first_bh)) { | |
728 | error = gfs2_meta_reread(sdp, first_bh, DIO_START); | |
729 | if (error) | |
730 | goto out; | |
731 | } | |
732 | ||
733 | dblock++; | |
734 | extlen--; | |
735 | ||
736 | while (extlen) { | |
737 | bh = getbuf(sdp, aspace, dblock, CREATE); | |
738 | ||
739 | if (!buffer_uptodate(bh) && !buffer_locked(bh)) { | |
740 | error = gfs2_meta_reread(sdp, bh, DIO_START); | |
741 | brelse(bh); | |
742 | if (error) | |
743 | goto out; | |
744 | } else | |
745 | brelse(bh); | |
746 | ||
747 | dblock++; | |
748 | extlen--; | |
749 | ||
750 | if (buffer_uptodate(first_bh)) | |
751 | break; | |
752 | } | |
753 | ||
a91ea69f | 754 | out: |
b3b94faa DT |
755 | brelse(first_bh); |
756 | } | |
757 | ||
758 | /** | |
759 | * gfs2_meta_syncfs - sync all the buffers in a filesystem | |
760 | * @sdp: the filesystem | |
761 | * | |
762 | */ | |
763 | ||
764 | void gfs2_meta_syncfs(struct gfs2_sbd *sdp) | |
765 | { | |
b09e593d | 766 | gfs2_log_flush(sdp, NULL); |
b3b94faa DT |
767 | for (;;) { |
768 | gfs2_ail1_start(sdp, DIO_ALL); | |
769 | if (gfs2_ail1_empty(sdp, DIO_ALL)) | |
770 | break; | |
fe1bdedc | 771 | msleep(10); |
b3b94faa DT |
772 | } |
773 | } | |
774 |