1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2008 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 version 2.
8 */
9
10 #include <linux/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/gfs2_ondisk.h>
15 #include <linux/bio.h>
16
17 #include "gfs2.h"
18 #include "incore.h"
19 #include "bmap.h"
20 #include "glock.h"
21 #include "glops.h"
22 #include "inode.h"
23 #include "log.h"
24 #include "meta_io.h"
25 #include "recovery.h"
26 #include "rgrp.h"
27 #include "util.h"
28 #include "trans.h"
29
30 /**
31 * ail_empty_gl - remove all buffers for a given lock from the AIL
32 * @gl: the glock
33 *
34 * None of the buffers should be dirty, locked, or pinned.
35 */
36
37 static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
38 {
39 struct gfs2_sbd *sdp = gl->gl_sbd;
40 struct list_head *head = &gl->gl_ail_list;
41 struct gfs2_bufdata *bd;
42 struct buffer_head *bh;
43 struct gfs2_trans tr;
44
45 memset(&tr, 0, sizeof(tr));
46 tr.tr_revokes = atomic_read(&gl->gl_ail_count);
47
48 if (!tr.tr_revokes)
49 return;
50
51 /* A shortened, inline version of gfs2_trans_begin() */
52 tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
53 tr.tr_ip = (unsigned long)__builtin_return_address(0);
54 INIT_LIST_HEAD(&tr.tr_list_buf);
55 gfs2_log_reserve(sdp, tr.tr_reserved);
56 BUG_ON(current->journal_info);
57 current->journal_info = &tr;
58
59 gfs2_log_lock(sdp);
60 while (!list_empty(head)) {
61 bd = list_entry(head->next, struct gfs2_bufdata,
62 bd_ail_gl_list);
63 bh = bd->bd_bh;
64 gfs2_remove_from_ail(bd);
65 bd->bd_bh = NULL;
66 bh->b_private = NULL;
67 bd->bd_blkno = bh->b_blocknr;
68 gfs2_assert_withdraw(sdp, !buffer_busy(bh));
69 gfs2_trans_add_revoke(sdp, bd);
70 }
71 gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
72 gfs2_log_unlock(sdp);
73
74 gfs2_trans_end(sdp);
75 gfs2_log_flush(sdp, NULL);
76 }
77
78 /**
79 * rgrp_go_sync - sync out the metadata for this glock
80 * @gl: the glock
81 *
82 * Called when demoting or unlocking an EX glock. We must flush
83 * to disk all dirty buffers/pages relating to this glock, and must not
84 * not return to caller to demote/unlock the glock until I/O is complete.
85 */
86
87 static void rgrp_go_sync(struct gfs2_glock *gl)
88 {
89 struct address_space *metamapping = gl->gl_aspace->i_mapping;
90 int error;
91
92 if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
93 return;
94 BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
95
96 gfs2_log_flush(gl->gl_sbd, gl);
97 filemap_fdatawrite(metamapping);
98 error = filemap_fdatawait(metamapping);
99 mapping_set_error(metamapping, error);
100 gfs2_ail_empty_gl(gl);
101 }
102
103 /**
104 * rgrp_go_inval - invalidate the metadata for this glock
105 * @gl: the glock
106 * @flags:
107 *
108 * We never used LM_ST_DEFERRED with resource groups, so that we
109 * should always see the metadata flag set here.
110 *
111 */
112
113 static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
114 {
115 struct address_space *mapping = gl->gl_aspace->i_mapping;
116
117 BUG_ON(!(flags & DIO_METADATA));
118 gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
119 truncate_inode_pages(mapping, 0);
120
121 if (gl->gl_object) {
122 struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
123 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
124 }
125 }
126
127 /**
128 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
129 * @gl: the glock protecting the inode
130 *
131 */
132
133 static void inode_go_sync(struct gfs2_glock *gl)
134 {
135 struct gfs2_inode *ip = gl->gl_object;
136 struct address_space *metamapping = gl->gl_aspace->i_mapping;
137 int error;
138
139 if (ip && !S_ISREG(ip->i_inode.i_mode))
140 ip = NULL;
141 if (ip && test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
142 unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
143 if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
144 return;
145
146 BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
147
148 gfs2_log_flush(gl->gl_sbd, gl);
149 filemap_fdatawrite(metamapping);
150 if (ip) {
151 struct address_space *mapping = ip->i_inode.i_mapping;
152 filemap_fdatawrite(mapping);
153 error = filemap_fdatawait(mapping);
154 mapping_set_error(mapping, error);
155 }
156 error = filemap_fdatawait(metamapping);
157 mapping_set_error(metamapping, error);
158 gfs2_ail_empty_gl(gl);
159 /*
160 * Writeback of the data mapping may cause the dirty flag to be set
161 * so we have to clear it again here.
162 */
163 smp_mb__before_clear_bit();
164 clear_bit(GLF_DIRTY, &gl->gl_flags);
165 }
166
167 /**
168 * inode_go_inval - prepare a inode glock to be released
169 * @gl: the glock
170 * @flags:
171 *
172 * Normally we invlidate everything, but if we are moving into
173 * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
174 * can keep hold of the metadata, since it won't have changed.
175 *
176 */
177
178 static void inode_go_inval(struct gfs2_glock *gl, int flags)
179 {
180 struct gfs2_inode *ip = gl->gl_object;
181
182 gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
183
184 if (flags & DIO_METADATA) {
185 struct address_space *mapping = gl->gl_aspace->i_mapping;
186 truncate_inode_pages(mapping, 0);
187 if (ip)
188 set_bit(GIF_INVALID, &ip->i_flags);
189 }
190
191 if (ip == GFS2_I(gl->gl_sbd->sd_rindex))
192 gl->gl_sbd->sd_rindex_uptodate = 0;
193 if (ip && S_ISREG(ip->i_inode.i_mode))
194 truncate_inode_pages(ip->i_inode.i_mapping, 0);
195 }
196
197 /**
198 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
199 * @gl: the glock
200 *
201 * Returns: 1 if it's ok
202 */
203
204 static int inode_go_demote_ok(const struct gfs2_glock *gl)
205 {
206 struct gfs2_sbd *sdp = gl->gl_sbd;
207 if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
208 return 0;
209 return 1;
210 }
211
212 /**
213 * inode_go_lock - operation done after an inode lock is locked by a process
214 * @gl: the glock
215 * @flags:
216 *
217 * Returns: errno
218 */
219
220 static int inode_go_lock(struct gfs2_holder *gh)
221 {
222 struct gfs2_glock *gl = gh->gh_gl;
223 struct gfs2_sbd *sdp = gl->gl_sbd;
224 struct gfs2_inode *ip = gl->gl_object;
225 int error = 0;
226
227 if (!ip || (gh->gh_flags & GL_SKIP))
228 return 0;
229
230 if (test_bit(GIF_INVALID, &ip->i_flags)) {
231 error = gfs2_inode_refresh(ip);
232 if (error)
233 return error;
234 }
235
236 if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
237 (gl->gl_state == LM_ST_EXCLUSIVE) &&
238 (gh->gh_state == LM_ST_EXCLUSIVE)) {
239 spin_lock(&sdp->sd_trunc_lock);
240 if (list_empty(&ip->i_trunc_list))
241 list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
242 spin_unlock(&sdp->sd_trunc_lock);
243 wake_up(&sdp->sd_quota_wait);
244 return 1;
245 }
246
247 return error;
248 }
249
250 /**
251 * inode_go_dump - print information about an inode
252 * @seq: The iterator
253 * @ip: the inode
254 *
255 * Returns: 0 on success, -ENOBUFS when we run out of space
256 */
257
258 static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
259 {
260 const struct gfs2_inode *ip = gl->gl_object;
261 if (ip == NULL)
262 return 0;
263 gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu/%llu\n",
264 (unsigned long long)ip->i_no_formal_ino,
265 (unsigned long long)ip->i_no_addr,
266 IF2DT(ip->i_inode.i_mode), ip->i_flags,
267 (unsigned int)ip->i_diskflags,
268 (unsigned long long)ip->i_inode.i_size,
269 (unsigned long long)ip->i_disksize);
270 return 0;
271 }
272
273 /**
274 * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
275 * @gl: the glock
276 *
277 * Returns: 1 if it's ok
278 */
279
280 static int rgrp_go_demote_ok(const struct gfs2_glock *gl)
281 {
282 return !gl->gl_aspace->i_mapping->nrpages;
283 }
284
285 /**
286 * rgrp_go_lock - operation done after an rgrp lock is locked by
287 * a first holder on this node.
288 * @gl: the glock
289 * @flags:
290 *
291 * Returns: errno
292 */
293
294 static int rgrp_go_lock(struct gfs2_holder *gh)
295 {
296 return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
297 }
298
299 /**
300 * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
301 * a last holder on this node.
302 * @gl: the glock
303 * @flags:
304 *
305 */
306
307 static void rgrp_go_unlock(struct gfs2_holder *gh)
308 {
309 gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
310 }
311
312 /**
313 * trans_go_sync - promote/demote the transaction glock
314 * @gl: the glock
315 * @state: the requested state
316 * @flags:
317 *
318 */
319
320 static void trans_go_sync(struct gfs2_glock *gl)
321 {
322 struct gfs2_sbd *sdp = gl->gl_sbd;
323
324 if (gl->gl_state != LM_ST_UNLOCKED &&
325 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
326 flush_workqueue(gfs2_delete_workqueue);
327 gfs2_meta_syncfs(sdp);
328 gfs2_log_shutdown(sdp);
329 }
330 }
331
332 /**
333 * trans_go_xmote_bh - After promoting/demoting the transaction glock
334 * @gl: the glock
335 *
336 */
337
338 static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
339 {
340 struct gfs2_sbd *sdp = gl->gl_sbd;
341 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
342 struct gfs2_glock *j_gl = ip->i_gl;
343 struct gfs2_log_header_host head;
344 int error;
345
346 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
347 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
348
349 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
350 if (error)
351 gfs2_consist(sdp);
352 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
353 gfs2_consist(sdp);
354
355 /* Initialize some head of the log stuff */
356 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
357 sdp->sd_log_sequence = head.lh_sequence + 1;
358 gfs2_log_pointers_init(sdp, head.lh_blkno);
359 }
360 }
361 return 0;
362 }
363
364 /**
365 * trans_go_demote_ok
366 * @gl: the glock
367 *
368 * Always returns 0
369 */
370
371 static int trans_go_demote_ok(const struct gfs2_glock *gl)
372 {
373 return 0;
374 }
375
376 /**
377 * iopen_go_callback - schedule the dcache entry for the inode to be deleted
378 * @gl: the glock
379 *
380 * gl_spin lock is held while calling this
381 */
382 static void iopen_go_callback(struct gfs2_glock *gl)
383 {
384 struct gfs2_inode *ip = (struct gfs2_inode *)gl->gl_object;
385
386 if (gl->gl_demote_state == LM_ST_UNLOCKED &&
387 gl->gl_state == LM_ST_SHARED &&
388 ip && test_bit(GIF_USER, &ip->i_flags)) {
389 gfs2_glock_hold(gl);
390 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
391 gfs2_glock_put_nolock(gl);
392 }
393 }
394
395 const struct gfs2_glock_operations gfs2_meta_glops = {
396 .go_type = LM_TYPE_META,
397 };
398
399 const struct gfs2_glock_operations gfs2_inode_glops = {
400 .go_xmote_th = inode_go_sync,
401 .go_inval = inode_go_inval,
402 .go_demote_ok = inode_go_demote_ok,
403 .go_lock = inode_go_lock,
404 .go_dump = inode_go_dump,
405 .go_type = LM_TYPE_INODE,
406 .go_min_hold_time = HZ / 5,
407 };
408
409 const struct gfs2_glock_operations gfs2_rgrp_glops = {
410 .go_xmote_th = rgrp_go_sync,
411 .go_inval = rgrp_go_inval,
412 .go_demote_ok = rgrp_go_demote_ok,
413 .go_lock = rgrp_go_lock,
414 .go_unlock = rgrp_go_unlock,
415 .go_dump = gfs2_rgrp_dump,
416 .go_type = LM_TYPE_RGRP,
417 .go_min_hold_time = HZ / 5,
418 };
419
420 const struct gfs2_glock_operations gfs2_trans_glops = {
421 .go_xmote_th = trans_go_sync,
422 .go_xmote_bh = trans_go_xmote_bh,
423 .go_demote_ok = trans_go_demote_ok,
424 .go_type = LM_TYPE_NONDISK,
425 };
426
427 const struct gfs2_glock_operations gfs2_iopen_glops = {
428 .go_type = LM_TYPE_IOPEN,
429 .go_callback = iopen_go_callback,
430 };
431
432 const struct gfs2_glock_operations gfs2_flock_glops = {
433 .go_type = LM_TYPE_FLOCK,
434 };
435
436 const struct gfs2_glock_operations gfs2_nondisk_glops = {
437 .go_type = LM_TYPE_NONDISK,
438 };
439
440 const struct gfs2_glock_operations gfs2_quota_glops = {
441 .go_type = LM_TYPE_QUOTA,
442 };
443
444 const struct gfs2_glock_operations gfs2_journal_glops = {
445 .go_type = LM_TYPE_JOURNAL,
446 };
447
448 const struct gfs2_glock_operations *gfs2_glops_list[] = {
449 [LM_TYPE_META] = &gfs2_meta_glops,
450 [LM_TYPE_INODE] = &gfs2_inode_glops,
451 [LM_TYPE_RGRP] = &gfs2_rgrp_glops,
452 [LM_TYPE_NONDISK] = &gfs2_trans_glops,
453 [LM_TYPE_IOPEN] = &gfs2_iopen_glops,
454 [LM_TYPE_FLOCK] = &gfs2_flock_glops,
455 [LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
456 [LM_TYPE_QUOTA] = &gfs2_quota_glops,
457 [LM_TYPE_JOURNAL] = &gfs2_journal_glops,
458 };
459
460
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