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/spinlock.h>
11 #include <linux/completion.h>
12 #include <linux/buffer_head.h>
13 #include <linux/gfs2_ondisk.h>
14 #include <linux/bio.h>
15 #include <linux/posix_acl.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
gfs2_ail_empty_gl(struct gfs2_glock * gl)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 spin_lock(&sdp->sd_ail_lock);
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 spin_unlock(&sdp->sd_ail_lock);
66
67 bd->bd_bh = NULL;
68 bh->b_private = NULL;
69 bd->bd_blkno = bh->b_blocknr;
70 gfs2_log_lock(sdp);
71 gfs2_assert_withdraw(sdp, !buffer_busy(bh));
72 gfs2_trans_add_revoke(sdp, bd);
73 gfs2_log_unlock(sdp);
74
75 spin_lock(&sdp->sd_ail_lock);
76 }
77 gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
78 spin_unlock(&sdp->sd_ail_lock);
79
80 gfs2_trans_end(sdp);
81 gfs2_log_flush(sdp, NULL);
82 }
83
84 /**
85 * rgrp_go_sync - sync out the metadata for this glock
86 * @gl: the glock
87 *
88 * Called when demoting or unlocking an EX glock. We must flush
89 * to disk all dirty buffers/pages relating to this glock, and must not
90 * not return to caller to demote/unlock the glock until I/O is complete.
91 */
92
rgrp_go_sync(struct gfs2_glock * gl)93 static void rgrp_go_sync(struct gfs2_glock *gl)
94 {
95 struct address_space *metamapping = gfs2_glock2aspace(gl);
96 int error;
97
98 if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
99 return;
100 BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
101
102 gfs2_log_flush(gl->gl_sbd, gl);
103 filemap_fdatawrite(metamapping);
104 error = filemap_fdatawait(metamapping);
105 mapping_set_error(metamapping, error);
106 gfs2_ail_empty_gl(gl);
107 }
108
109 /**
110 * rgrp_go_inval - invalidate the metadata for this glock
111 * @gl: the glock
112 * @flags:
113 *
114 * We never used LM_ST_DEFERRED with resource groups, so that we
115 * should always see the metadata flag set here.
116 *
117 */
118
rgrp_go_inval(struct gfs2_glock * gl,int flags)119 static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
120 {
121 struct address_space *mapping = gfs2_glock2aspace(gl);
122
123 BUG_ON(!(flags & DIO_METADATA));
124 gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
125 truncate_inode_pages(mapping, 0);
126
127 if (gl->gl_object) {
128 struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
129 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
130 }
131 }
132
133 /**
134 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
135 * @gl: the glock protecting the inode
136 *
137 */
138
inode_go_sync(struct gfs2_glock * gl)139 static void inode_go_sync(struct gfs2_glock *gl)
140 {
141 struct gfs2_inode *ip = gl->gl_object;
142 struct address_space *metamapping = gfs2_glock2aspace(gl);
143 int error;
144
145 if (ip && !S_ISREG(ip->i_inode.i_mode))
146 ip = NULL;
147 if (ip && test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
148 unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
149 if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
150 return;
151
152 BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
153
154 gfs2_log_flush(gl->gl_sbd, gl);
155 filemap_fdatawrite(metamapping);
156 if (ip) {
157 struct address_space *mapping = ip->i_inode.i_mapping;
158 filemap_fdatawrite(mapping);
159 error = filemap_fdatawait(mapping);
160 mapping_set_error(mapping, error);
161 }
162 error = filemap_fdatawait(metamapping);
163 mapping_set_error(metamapping, error);
164 gfs2_ail_empty_gl(gl);
165 /*
166 * Writeback of the data mapping may cause the dirty flag to be set
167 * so we have to clear it again here.
168 */
169 smp_mb__before_clear_bit();
170 clear_bit(GLF_DIRTY, &gl->gl_flags);
171 }
172
173 /**
174 * inode_go_inval - prepare a inode glock to be released
175 * @gl: the glock
176 * @flags:
177 *
178 * Normally we invlidate everything, but if we are moving into
179 * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
180 * can keep hold of the metadata, since it won't have changed.
181 *
182 */
183
inode_go_inval(struct gfs2_glock * gl,int flags)184 static void inode_go_inval(struct gfs2_glock *gl, int flags)
185 {
186 struct gfs2_inode *ip = gl->gl_object;
187
188 gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
189
190 if (flags & DIO_METADATA) {
191 struct address_space *mapping = gfs2_glock2aspace(gl);
192 truncate_inode_pages(mapping, 0);
193 if (ip) {
194 set_bit(GIF_INVALID, &ip->i_flags);
195 forget_all_cached_acls(&ip->i_inode);
196 }
197 }
198
199 if (ip == GFS2_I(gl->gl_sbd->sd_rindex))
200 gl->gl_sbd->sd_rindex_uptodate = 0;
201 if (ip && S_ISREG(ip->i_inode.i_mode))
202 truncate_inode_pages(ip->i_inode.i_mapping, 0);
203 }
204
205 /**
206 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
207 * @gl: the glock
208 *
209 * Returns: 1 if it's ok
210 */
211
inode_go_demote_ok(const struct gfs2_glock * gl)212 static int inode_go_demote_ok(const struct gfs2_glock *gl)
213 {
214 struct gfs2_sbd *sdp = gl->gl_sbd;
215 struct gfs2_holder *gh;
216
217 if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
218 return 0;
219
220 if (!list_empty(&gl->gl_holders)) {
221 gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list);
222 if (gh->gh_list.next != &gl->gl_holders)
223 return 0;
224 }
225
226 return 1;
227 }
228
229 /**
230 * inode_go_lock - operation done after an inode lock is locked by a process
231 * @gl: the glock
232 * @flags:
233 *
234 * Returns: errno
235 */
236
inode_go_lock(struct gfs2_holder * gh)237 static int inode_go_lock(struct gfs2_holder *gh)
238 {
239 struct gfs2_glock *gl = gh->gh_gl;
240 struct gfs2_sbd *sdp = gl->gl_sbd;
241 struct gfs2_inode *ip = gl->gl_object;
242 int error = 0;
243
244 if (!ip || (gh->gh_flags & GL_SKIP))
245 return 0;
246
247 if (test_bit(GIF_INVALID, &ip->i_flags)) {
248 error = gfs2_inode_refresh(ip);
249 if (error)
250 return error;
251 }
252
253 if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
254 (gl->gl_state == LM_ST_EXCLUSIVE) &&
255 (gh->gh_state == LM_ST_EXCLUSIVE)) {
256 spin_lock(&sdp->sd_trunc_lock);
257 if (list_empty(&ip->i_trunc_list))
258 list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
259 spin_unlock(&sdp->sd_trunc_lock);
260 wake_up(&sdp->sd_quota_wait);
261 return 1;
262 }
263
264 return error;
265 }
266
267 /**
268 * inode_go_dump - print information about an inode
269 * @seq: The iterator
270 * @ip: the inode
271 *
272 * Returns: 0 on success, -ENOBUFS when we run out of space
273 */
274
inode_go_dump(struct seq_file * seq,const struct gfs2_glock * gl)275 static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
276 {
277 const struct gfs2_inode *ip = gl->gl_object;
278 if (ip == NULL)
279 return 0;
280 gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu\n",
281 (unsigned long long)ip->i_no_formal_ino,
282 (unsigned long long)ip->i_no_addr,
283 IF2DT(ip->i_inode.i_mode), ip->i_flags,
284 (unsigned int)ip->i_diskflags,
285 (unsigned long long)i_size_read(&ip->i_inode));
286 return 0;
287 }
288
289 /**
290 * rgrp_go_lock - operation done after an rgrp lock is locked by
291 * a first holder on this node.
292 * @gl: the glock
293 * @flags:
294 *
295 * Returns: errno
296 */
297
rgrp_go_lock(struct gfs2_holder * gh)298 static int rgrp_go_lock(struct gfs2_holder *gh)
299 {
300 return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
301 }
302
303 /**
304 * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
305 * a last holder on this node.
306 * @gl: the glock
307 * @flags:
308 *
309 */
310
rgrp_go_unlock(struct gfs2_holder * gh)311 static void rgrp_go_unlock(struct gfs2_holder *gh)
312 {
313 gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
314 }
315
316 /**
317 * trans_go_sync - promote/demote the transaction glock
318 * @gl: the glock
319 * @state: the requested state
320 * @flags:
321 *
322 */
323
trans_go_sync(struct gfs2_glock * gl)324 static void trans_go_sync(struct gfs2_glock *gl)
325 {
326 struct gfs2_sbd *sdp = gl->gl_sbd;
327
328 if (gl->gl_state != LM_ST_UNLOCKED &&
329 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
330 gfs2_meta_syncfs(sdp);
331 gfs2_log_shutdown(sdp);
332 }
333 }
334
335 /**
336 * trans_go_xmote_bh - After promoting/demoting the transaction glock
337 * @gl: the glock
338 *
339 */
340
trans_go_xmote_bh(struct gfs2_glock * gl,struct gfs2_holder * gh)341 static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
342 {
343 struct gfs2_sbd *sdp = gl->gl_sbd;
344 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
345 struct gfs2_glock *j_gl = ip->i_gl;
346 struct gfs2_log_header_host head;
347 int error;
348
349 if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
350 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
351
352 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
353 if (error)
354 gfs2_consist(sdp);
355 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
356 gfs2_consist(sdp);
357
358 /* Initialize some head of the log stuff */
359 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
360 sdp->sd_log_sequence = head.lh_sequence + 1;
361 gfs2_log_pointers_init(sdp, head.lh_blkno);
362 }
363 }
364 return 0;
365 }
366
367 /**
368 * trans_go_demote_ok
369 * @gl: the glock
370 *
371 * Always returns 0
372 */
373
trans_go_demote_ok(const struct gfs2_glock * gl)374 static int trans_go_demote_ok(const struct gfs2_glock *gl)
375 {
376 return 0;
377 }
378
379 /**
380 * iopen_go_callback - schedule the dcache entry for the inode to be deleted
381 * @gl: the glock
382 *
383 * gl_spin lock is held while calling this
384 */
iopen_go_callback(struct gfs2_glock * gl)385 static void iopen_go_callback(struct gfs2_glock *gl)
386 {
387 struct gfs2_inode *ip = (struct gfs2_inode *)gl->gl_object;
388 struct gfs2_sbd *sdp = gl->gl_sbd;
389
390 if (sdp->sd_vfs->s_flags & MS_RDONLY)
391 return;
392
393 if (gl->gl_demote_state == LM_ST_UNLOCKED &&
394 gl->gl_state == LM_ST_SHARED && ip) {
395 gfs2_glock_hold(gl);
396 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
397 gfs2_glock_put_nolock(gl);
398 }
399 }
400
401 const struct gfs2_glock_operations gfs2_meta_glops = {
402 .go_type = LM_TYPE_META,
403 };
404
405 const struct gfs2_glock_operations gfs2_inode_glops = {
406 .go_xmote_th = inode_go_sync,
407 .go_inval = inode_go_inval,
408 .go_demote_ok = inode_go_demote_ok,
409 .go_lock = inode_go_lock,
410 .go_dump = inode_go_dump,
411 .go_type = LM_TYPE_INODE,
412 .go_min_hold_time = HZ / 5,
413 .go_flags = GLOF_ASPACE,
414 };
415
416 const struct gfs2_glock_operations gfs2_rgrp_glops = {
417 .go_xmote_th = rgrp_go_sync,
418 .go_inval = rgrp_go_inval,
419 .go_lock = rgrp_go_lock,
420 .go_unlock = rgrp_go_unlock,
421 .go_dump = gfs2_rgrp_dump,
422 .go_type = LM_TYPE_RGRP,
423 .go_min_hold_time = HZ / 5,
424 .go_flags = GLOF_ASPACE,
425 };
426
427 const struct gfs2_glock_operations gfs2_trans_glops = {
428 .go_xmote_th = trans_go_sync,
429 .go_xmote_bh = trans_go_xmote_bh,
430 .go_demote_ok = trans_go_demote_ok,
431 .go_type = LM_TYPE_NONDISK,
432 };
433
434 const struct gfs2_glock_operations gfs2_iopen_glops = {
435 .go_type = LM_TYPE_IOPEN,
436 .go_callback = iopen_go_callback,
437 };
438
439 const struct gfs2_glock_operations gfs2_flock_glops = {
440 .go_type = LM_TYPE_FLOCK,
441 };
442
443 const struct gfs2_glock_operations gfs2_nondisk_glops = {
444 .go_type = LM_TYPE_NONDISK,
445 };
446
447 const struct gfs2_glock_operations gfs2_quota_glops = {
448 .go_type = LM_TYPE_QUOTA,
449 };
450
451 const struct gfs2_glock_operations gfs2_journal_glops = {
452 .go_type = LM_TYPE_JOURNAL,
453 };
454
455 const struct gfs2_glock_operations *gfs2_glops_list[] = {
456 [LM_TYPE_META] = &gfs2_meta_glops,
457 [LM_TYPE_INODE] = &gfs2_inode_glops,
458 [LM_TYPE_RGRP] = &gfs2_rgrp_glops,
459 [LM_TYPE_IOPEN] = &gfs2_iopen_glops,
460 [LM_TYPE_FLOCK] = &gfs2_flock_glops,
461 [LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
462 [LM_TYPE_QUOTA] = &gfs2_quota_glops,
463 [LM_TYPE_JOURNAL] = &gfs2_journal_glops,
464 };
465
466