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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> | |
5c676f6d | 15 | #include <linux/gfs2_ondisk.h> |
b3b94faa DT |
16 | #include <asm/semaphore.h> |
17 | ||
18 | #include "gfs2.h" | |
5c676f6d SW |
19 | #include "lm_interface.h" |
20 | #include "incore.h" | |
b3b94faa DT |
21 | #include "bmap.h" |
22 | #include "glock.h" | |
23 | #include "glops.h" | |
24 | #include "inode.h" | |
25 | #include "log.h" | |
26 | #include "meta_io.h" | |
27 | #include "page.h" | |
28 | #include "recovery.h" | |
29 | #include "rgrp.h" | |
5c676f6d | 30 | #include "util.h" |
b3b94faa DT |
31 | |
32 | /** | |
33 | * meta_go_sync - sync out the metadata for this glock | |
34 | * @gl: the glock | |
35 | * @flags: DIO_* | |
36 | * | |
37 | * Called when demoting or unlocking an EX glock. We must flush | |
38 | * to disk all dirty buffers/pages relating to this glock, and must not | |
39 | * not return to caller to demote/unlock the glock until I/O is complete. | |
40 | */ | |
41 | ||
42 | static void meta_go_sync(struct gfs2_glock *gl, int flags) | |
43 | { | |
44 | if (!(flags & DIO_METADATA)) | |
45 | return; | |
46 | ||
47 | if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) { | |
48 | gfs2_log_flush_glock(gl); | |
49 | gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT); | |
50 | if (flags & DIO_RELEASE) | |
51 | gfs2_ail_empty_gl(gl); | |
52 | } | |
53 | ||
54 | clear_bit(GLF_SYNC, &gl->gl_flags); | |
55 | } | |
56 | ||
57 | /** | |
58 | * meta_go_inval - invalidate the metadata for this glock | |
59 | * @gl: the glock | |
60 | * @flags: | |
61 | * | |
62 | */ | |
63 | ||
64 | static void meta_go_inval(struct gfs2_glock *gl, int flags) | |
65 | { | |
66 | if (!(flags & DIO_METADATA)) | |
67 | return; | |
68 | ||
69 | gfs2_meta_inval(gl); | |
70 | gl->gl_vn++; | |
71 | } | |
72 | ||
73 | /** | |
74 | * meta_go_demote_ok - Check to see if it's ok to unlock a glock | |
75 | * @gl: the glock | |
76 | * | |
77 | * Returns: 1 if we have no cached data; ok to demote meta glock | |
78 | */ | |
79 | ||
80 | static int meta_go_demote_ok(struct gfs2_glock *gl) | |
81 | { | |
82 | return !gl->gl_aspace->i_mapping->nrpages; | |
83 | } | |
84 | ||
85 | /** | |
86 | * inode_go_xmote_th - promote/demote a glock | |
87 | * @gl: the glock | |
88 | * @state: the requested state | |
89 | * @flags: | |
90 | * | |
91 | */ | |
92 | ||
93 | static void inode_go_xmote_th(struct gfs2_glock *gl, unsigned int state, | |
94 | int flags) | |
95 | { | |
96 | if (gl->gl_state != LM_ST_UNLOCKED) | |
97 | gfs2_pte_inval(gl); | |
98 | gfs2_glock_xmote_th(gl, state, flags); | |
99 | } | |
100 | ||
101 | /** | |
102 | * inode_go_xmote_bh - After promoting/demoting a glock | |
103 | * @gl: the glock | |
104 | * | |
105 | */ | |
106 | ||
107 | static void inode_go_xmote_bh(struct gfs2_glock *gl) | |
108 | { | |
109 | struct gfs2_holder *gh = gl->gl_req_gh; | |
110 | struct buffer_head *bh; | |
111 | int error; | |
112 | ||
113 | if (gl->gl_state != LM_ST_UNLOCKED && | |
114 | (!gh || !(gh->gh_flags & GL_SKIP))) { | |
115 | error = gfs2_meta_read(gl, gl->gl_name.ln_number, DIO_START, | |
116 | &bh); | |
117 | if (!error) | |
118 | brelse(bh); | |
119 | } | |
120 | } | |
121 | ||
122 | /** | |
123 | * inode_go_drop_th - unlock a glock | |
124 | * @gl: the glock | |
125 | * | |
126 | * Invoked from rq_demote(). | |
127 | * Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long) | |
128 | * is being purged from our node's glock cache; we're dropping lock. | |
129 | */ | |
130 | ||
131 | static void inode_go_drop_th(struct gfs2_glock *gl) | |
132 | { | |
133 | gfs2_pte_inval(gl); | |
134 | gfs2_glock_drop_th(gl); | |
135 | } | |
136 | ||
137 | /** | |
138 | * inode_go_sync - Sync the dirty data and/or metadata for an inode glock | |
139 | * @gl: the glock protecting the inode | |
140 | * @flags: | |
141 | * | |
142 | */ | |
143 | ||
144 | static void inode_go_sync(struct gfs2_glock *gl, int flags) | |
145 | { | |
146 | int meta = (flags & DIO_METADATA); | |
147 | int data = (flags & DIO_DATA); | |
148 | ||
149 | if (test_bit(GLF_DIRTY, &gl->gl_flags)) { | |
150 | if (meta && data) { | |
151 | gfs2_page_sync(gl, flags | DIO_START); | |
152 | gfs2_log_flush_glock(gl); | |
153 | gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT); | |
154 | gfs2_page_sync(gl, flags | DIO_WAIT); | |
155 | clear_bit(GLF_DIRTY, &gl->gl_flags); | |
156 | } else if (meta) { | |
157 | gfs2_log_flush_glock(gl); | |
158 | gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT); | |
159 | } else if (data) | |
160 | gfs2_page_sync(gl, flags | DIO_START | DIO_WAIT); | |
161 | if (flags & DIO_RELEASE) | |
162 | gfs2_ail_empty_gl(gl); | |
163 | } | |
164 | ||
165 | clear_bit(GLF_SYNC, &gl->gl_flags); | |
166 | } | |
167 | ||
168 | /** | |
169 | * inode_go_inval - prepare a inode glock to be released | |
170 | * @gl: the glock | |
171 | * @flags: | |
172 | * | |
173 | */ | |
174 | ||
175 | static void inode_go_inval(struct gfs2_glock *gl, int flags) | |
176 | { | |
177 | int meta = (flags & DIO_METADATA); | |
178 | int data = (flags & DIO_DATA); | |
179 | ||
180 | if (meta) { | |
181 | gfs2_meta_inval(gl); | |
182 | gl->gl_vn++; | |
183 | } | |
184 | if (data) | |
185 | gfs2_page_inval(gl); | |
186 | } | |
187 | ||
188 | /** | |
189 | * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock | |
190 | * @gl: the glock | |
191 | * | |
192 | * Returns: 1 if it's ok | |
193 | */ | |
194 | ||
195 | static int inode_go_demote_ok(struct gfs2_glock *gl) | |
196 | { | |
197 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
198 | int demote = 0; | |
199 | ||
5c676f6d | 200 | if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages) |
b3b94faa DT |
201 | demote = 1; |
202 | else if (!sdp->sd_args.ar_localcaching && | |
203 | time_after_eq(jiffies, gl->gl_stamp + | |
204 | gfs2_tune_get(sdp, gt_demote_secs) * HZ)) | |
205 | demote = 1; | |
206 | ||
207 | return demote; | |
208 | } | |
209 | ||
210 | /** | |
211 | * inode_go_lock - operation done after an inode lock is locked by a process | |
212 | * @gl: the glock | |
213 | * @flags: | |
214 | * | |
215 | * Returns: errno | |
216 | */ | |
217 | ||
218 | static int inode_go_lock(struct gfs2_holder *gh) | |
219 | { | |
220 | struct gfs2_glock *gl = gh->gh_gl; | |
5c676f6d | 221 | struct gfs2_inode *ip = gl->gl_object; |
b3b94faa DT |
222 | int error = 0; |
223 | ||
224 | if (!ip) | |
225 | return 0; | |
226 | ||
227 | if (ip->i_vn != gl->gl_vn) { | |
228 | error = gfs2_inode_refresh(ip); | |
229 | if (error) | |
230 | return error; | |
231 | gfs2_inode_attr_in(ip); | |
232 | } | |
233 | ||
234 | if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) && | |
235 | (gl->gl_state == LM_ST_EXCLUSIVE) && | |
236 | (gh->gh_flags & GL_LOCAL_EXCL)) | |
237 | error = gfs2_truncatei_resume(ip); | |
238 | ||
239 | return error; | |
240 | } | |
241 | ||
242 | /** | |
243 | * inode_go_unlock - operation done before an inode lock is unlocked by a | |
244 | * process | |
245 | * @gl: the glock | |
246 | * @flags: | |
247 | * | |
248 | */ | |
249 | ||
250 | static void inode_go_unlock(struct gfs2_holder *gh) | |
251 | { | |
252 | struct gfs2_glock *gl = gh->gh_gl; | |
5c676f6d | 253 | struct gfs2_inode *ip = gl->gl_object; |
b3b94faa DT |
254 | |
255 | if (ip && test_bit(GLF_DIRTY, &gl->gl_flags)) | |
256 | gfs2_inode_attr_in(ip); | |
257 | ||
258 | if (ip) | |
259 | gfs2_meta_cache_flush(ip); | |
260 | } | |
261 | ||
262 | /** | |
263 | * inode_greedy - | |
264 | * @gl: the glock | |
265 | * | |
266 | */ | |
267 | ||
268 | static void inode_greedy(struct gfs2_glock *gl) | |
269 | { | |
270 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
5c676f6d | 271 | struct gfs2_inode *ip = gl->gl_object; |
b3b94faa DT |
272 | unsigned int quantum = gfs2_tune_get(sdp, gt_greedy_quantum); |
273 | unsigned int max = gfs2_tune_get(sdp, gt_greedy_max); | |
274 | unsigned int new_time; | |
275 | ||
276 | spin_lock(&ip->i_spin); | |
277 | ||
278 | if (time_after(ip->i_last_pfault + quantum, jiffies)) { | |
279 | new_time = ip->i_greedy + quantum; | |
280 | if (new_time > max) | |
281 | new_time = max; | |
282 | } else { | |
283 | new_time = ip->i_greedy - quantum; | |
284 | if (!new_time || new_time > max) | |
285 | new_time = 1; | |
286 | } | |
287 | ||
288 | ip->i_greedy = new_time; | |
289 | ||
290 | spin_unlock(&ip->i_spin); | |
291 | ||
292 | gfs2_inode_put(ip); | |
293 | } | |
294 | ||
295 | /** | |
296 | * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock | |
297 | * @gl: the glock | |
298 | * | |
299 | * Returns: 1 if it's ok | |
300 | */ | |
301 | ||
302 | static int rgrp_go_demote_ok(struct gfs2_glock *gl) | |
303 | { | |
304 | return !gl->gl_aspace->i_mapping->nrpages; | |
305 | } | |
306 | ||
307 | /** | |
308 | * rgrp_go_lock - operation done after an rgrp lock is locked by | |
309 | * a first holder on this node. | |
310 | * @gl: the glock | |
311 | * @flags: | |
312 | * | |
313 | * Returns: errno | |
314 | */ | |
315 | ||
316 | static int rgrp_go_lock(struct gfs2_holder *gh) | |
317 | { | |
5c676f6d | 318 | return gfs2_rgrp_bh_get(gh->gh_gl->gl_object); |
b3b94faa DT |
319 | } |
320 | ||
321 | /** | |
322 | * rgrp_go_unlock - operation done before an rgrp lock is unlocked by | |
323 | * a last holder on this node. | |
324 | * @gl: the glock | |
325 | * @flags: | |
326 | * | |
327 | */ | |
328 | ||
329 | static void rgrp_go_unlock(struct gfs2_holder *gh) | |
330 | { | |
5c676f6d | 331 | gfs2_rgrp_bh_put(gh->gh_gl->gl_object); |
b3b94faa DT |
332 | } |
333 | ||
334 | /** | |
335 | * trans_go_xmote_th - promote/demote the transaction glock | |
336 | * @gl: the glock | |
337 | * @state: the requested state | |
338 | * @flags: | |
339 | * | |
340 | */ | |
341 | ||
342 | static void trans_go_xmote_th(struct gfs2_glock *gl, unsigned int state, | |
343 | int flags) | |
344 | { | |
345 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
346 | ||
347 | if (gl->gl_state != LM_ST_UNLOCKED && | |
348 | test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { | |
349 | gfs2_meta_syncfs(sdp); | |
350 | gfs2_log_shutdown(sdp); | |
351 | } | |
352 | ||
353 | gfs2_glock_xmote_th(gl, state, flags); | |
354 | } | |
355 | ||
356 | /** | |
357 | * trans_go_xmote_bh - After promoting/demoting the transaction glock | |
358 | * @gl: the glock | |
359 | * | |
360 | */ | |
361 | ||
362 | static void trans_go_xmote_bh(struct gfs2_glock *gl) | |
363 | { | |
364 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
5c676f6d SW |
365 | struct gfs2_inode *ip = sdp->sd_jdesc->jd_inode->u.generic_ip; |
366 | struct gfs2_glock *j_gl = ip->i_gl; | |
b3b94faa DT |
367 | struct gfs2_log_header head; |
368 | int error; | |
369 | ||
370 | if (gl->gl_state != LM_ST_UNLOCKED && | |
371 | test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { | |
5c676f6d | 372 | gfs2_meta_cache_flush(sdp->sd_jdesc->jd_inode->u.generic_ip); |
b3b94faa DT |
373 | j_gl->gl_ops->go_inval(j_gl, DIO_METADATA | DIO_DATA); |
374 | ||
375 | error = gfs2_find_jhead(sdp->sd_jdesc, &head); | |
376 | if (error) | |
377 | gfs2_consist(sdp); | |
378 | if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) | |
379 | gfs2_consist(sdp); | |
380 | ||
381 | /* Initialize some head of the log stuff */ | |
382 | if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) { | |
383 | sdp->sd_log_sequence = head.lh_sequence + 1; | |
384 | gfs2_log_pointers_init(sdp, head.lh_blkno); | |
385 | } | |
386 | } | |
387 | } | |
388 | ||
389 | /** | |
390 | * trans_go_drop_th - unlock the transaction glock | |
391 | * @gl: the glock | |
392 | * | |
393 | * We want to sync the device even with localcaching. Remember | |
394 | * that localcaching journal replay only marks buffers dirty. | |
395 | */ | |
396 | ||
397 | static void trans_go_drop_th(struct gfs2_glock *gl) | |
398 | { | |
399 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
400 | ||
401 | if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { | |
402 | gfs2_meta_syncfs(sdp); | |
403 | gfs2_log_shutdown(sdp); | |
404 | } | |
405 | ||
406 | gfs2_glock_drop_th(gl); | |
407 | } | |
408 | ||
409 | /** | |
410 | * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock | |
411 | * @gl: the glock | |
412 | * | |
413 | * Returns: 1 if it's ok | |
414 | */ | |
415 | ||
416 | static int quota_go_demote_ok(struct gfs2_glock *gl) | |
417 | { | |
418 | return !atomic_read(&gl->gl_lvb_count); | |
419 | } | |
420 | ||
421 | struct gfs2_glock_operations gfs2_meta_glops = { | |
422 | .go_xmote_th = gfs2_glock_xmote_th, | |
423 | .go_drop_th = gfs2_glock_drop_th, | |
424 | .go_sync = meta_go_sync, | |
425 | .go_inval = meta_go_inval, | |
426 | .go_demote_ok = meta_go_demote_ok, | |
427 | .go_type = LM_TYPE_META | |
428 | }; | |
429 | ||
430 | struct gfs2_glock_operations gfs2_inode_glops = { | |
431 | .go_xmote_th = inode_go_xmote_th, | |
432 | .go_xmote_bh = inode_go_xmote_bh, | |
433 | .go_drop_th = inode_go_drop_th, | |
434 | .go_sync = inode_go_sync, | |
435 | .go_inval = inode_go_inval, | |
436 | .go_demote_ok = inode_go_demote_ok, | |
437 | .go_lock = inode_go_lock, | |
438 | .go_unlock = inode_go_unlock, | |
439 | .go_greedy = inode_greedy, | |
440 | .go_type = LM_TYPE_INODE | |
441 | }; | |
442 | ||
443 | struct gfs2_glock_operations gfs2_rgrp_glops = { | |
444 | .go_xmote_th = gfs2_glock_xmote_th, | |
445 | .go_drop_th = gfs2_glock_drop_th, | |
446 | .go_sync = meta_go_sync, | |
447 | .go_inval = meta_go_inval, | |
448 | .go_demote_ok = rgrp_go_demote_ok, | |
449 | .go_lock = rgrp_go_lock, | |
450 | .go_unlock = rgrp_go_unlock, | |
451 | .go_type = LM_TYPE_RGRP | |
452 | }; | |
453 | ||
454 | struct gfs2_glock_operations gfs2_trans_glops = { | |
455 | .go_xmote_th = trans_go_xmote_th, | |
456 | .go_xmote_bh = trans_go_xmote_bh, | |
457 | .go_drop_th = trans_go_drop_th, | |
458 | .go_type = LM_TYPE_NONDISK | |
459 | }; | |
460 | ||
461 | struct gfs2_glock_operations gfs2_iopen_glops = { | |
462 | .go_xmote_th = gfs2_glock_xmote_th, | |
463 | .go_drop_th = gfs2_glock_drop_th, | |
464 | .go_callback = gfs2_iopen_go_callback, | |
465 | .go_type = LM_TYPE_IOPEN | |
466 | }; | |
467 | ||
468 | struct gfs2_glock_operations gfs2_flock_glops = { | |
469 | .go_xmote_th = gfs2_glock_xmote_th, | |
470 | .go_drop_th = gfs2_glock_drop_th, | |
471 | .go_type = LM_TYPE_FLOCK | |
472 | }; | |
473 | ||
474 | struct gfs2_glock_operations gfs2_nondisk_glops = { | |
475 | .go_xmote_th = gfs2_glock_xmote_th, | |
476 | .go_drop_th = gfs2_glock_drop_th, | |
477 | .go_type = LM_TYPE_NONDISK | |
478 | }; | |
479 | ||
480 | struct gfs2_glock_operations gfs2_quota_glops = { | |
481 | .go_xmote_th = gfs2_glock_xmote_th, | |
482 | .go_drop_th = gfs2_glock_drop_th, | |
483 | .go_demote_ok = quota_go_demote_ok, | |
484 | .go_type = LM_TYPE_QUOTA | |
485 | }; | |
486 | ||
487 | struct gfs2_glock_operations gfs2_journal_glops = { | |
488 | .go_xmote_th = gfs2_glock_xmote_th, | |
489 | .go_drop_th = gfs2_glock_drop_th, | |
490 | .go_type = LM_TYPE_JOURNAL | |
491 | }; | |
492 |