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[GFS2] Move gfs2_dinode_in to inode.c
[linux-2.6/kmemtrace.git] / fs / gfs2 / inode.c
blobb39cfcfe92766e08dc35757ff293fa6404184358
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 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/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/posix_acl.h>
16 #include <linux/sort.h>
17 #include <linux/gfs2_ondisk.h>
18 #include <linux/crc32.h>
19 #include <linux/lm_interface.h>
20 #include <linux/security.h>
21
22 #include "gfs2.h"
23 #include "incore.h"
24 #include "acl.h"
25 #include "bmap.h"
26 #include "dir.h"
27 #include "eattr.h"
28 #include "glock.h"
29 #include "glops.h"
30 #include "inode.h"
31 #include "log.h"
32 #include "meta_io.h"
33 #include "ops_address.h"
34 #include "ops_file.h"
35 #include "ops_inode.h"
36 #include "quota.h"
37 #include "rgrp.h"
38 #include "trans.h"
39 #include "util.h"
40
41 /**
42 * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode
43 * @ip: The GFS2 inode (with embedded disk inode data)
44 * @inode: The Linux VFS inode
45 *
46 */
47
48 void gfs2_inode_attr_in(struct gfs2_inode *ip)
49 {
50 struct inode *inode = &ip->i_inode;
51 struct gfs2_dinode_host *di = &ip->i_di;
52
53 inode->i_ino = ip->i_num.no_addr;
54
55 switch (di->di_mode & S_IFMT) {
56 case S_IFBLK:
57 case S_IFCHR:
58 inode->i_rdev = MKDEV(di->di_major, di->di_minor);
59 break;
60 default:
61 inode->i_rdev = 0;
62 break;
63 };
64
65 inode->i_mode = di->di_mode;
66 inode->i_nlink = di->di_nlink;
67 inode->i_uid = di->di_uid;
68 inode->i_gid = di->di_gid;
69 i_size_write(inode, di->di_size);
70 inode->i_atime.tv_sec = di->di_atime;
71 inode->i_mtime.tv_sec = di->di_mtime;
72 inode->i_ctime.tv_sec = di->di_ctime;
73 inode->i_atime.tv_nsec = 0;
74 inode->i_mtime.tv_nsec = 0;
75 inode->i_ctime.tv_nsec = 0;
76 inode->i_blocks = di->di_blocks <<
77 (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
78
79 if (di->di_flags & GFS2_DIF_IMMUTABLE)
80 inode->i_flags |= S_IMMUTABLE;
81 else
82 inode->i_flags &= ~S_IMMUTABLE;
83
84 if (di->di_flags & GFS2_DIF_APPENDONLY)
85 inode->i_flags |= S_APPEND;
86 else
87 inode->i_flags &= ~S_APPEND;
88 }
89
90 /**
91 * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode
92 * @ip: The GFS2 inode
93 *
94 * Only copy out the attributes that we want the VFS layer
95 * to be able to modify.
96 */
97
98 void gfs2_inode_attr_out(struct gfs2_inode *ip)
99 {
100 struct inode *inode = &ip->i_inode;
101 struct gfs2_dinode_host *di = &ip->i_di;
102 gfs2_assert_withdraw(GFS2_SB(inode),
103 (di->di_mode & S_IFMT) == (inode->i_mode & S_IFMT));
104 di->di_mode = inode->i_mode;
105 di->di_uid = inode->i_uid;
106 di->di_gid = inode->i_gid;
107 di->di_atime = inode->i_atime.tv_sec;
108 di->di_mtime = inode->i_mtime.tv_sec;
109 di->di_ctime = inode->i_ctime.tv_sec;
110 }
111
112 static int iget_test(struct inode *inode, void *opaque)
113 {
114 struct gfs2_inode *ip = GFS2_I(inode);
115 struct gfs2_inum_host *inum = opaque;
116
117 if (ip && ip->i_num.no_addr == inum->no_addr)
118 return 1;
119
120 return 0;
121 }
122
123 static int iget_set(struct inode *inode, void *opaque)
124 {
125 struct gfs2_inode *ip = GFS2_I(inode);
126 struct gfs2_inum_host *inum = opaque;
127
128 ip->i_num = *inum;
129 return 0;
130 }
131
132 struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum_host *inum)
133 {
134 return ilookup5(sb, (unsigned long)inum->no_formal_ino,
135 iget_test, inum);
136 }
137
138 static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum_host *inum)
139 {
140 return iget5_locked(sb, (unsigned long)inum->no_formal_ino,
141 iget_test, iget_set, inum);
142 }
143
144 /**
145 * gfs2_inode_lookup - Lookup an inode
146 * @sb: The super block
147 * @inum: The inode number
148 * @type: The type of the inode
149 *
150 * Returns: A VFS inode, or an error
151 */
152
153 struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum_host *inum, unsigned int type)
154 {
155 struct inode *inode = gfs2_iget(sb, inum);
156 struct gfs2_inode *ip = GFS2_I(inode);
157 struct gfs2_glock *io_gl;
158 int error;
159
160 if (!inode)
161 return ERR_PTR(-ENOBUFS);
162
163 if (inode->i_state & I_NEW) {
164 struct gfs2_sbd *sdp = GFS2_SB(inode);
165 umode_t mode = DT2IF(type);
166 inode->i_private = ip;
167 inode->i_mode = mode;
168
169 if (S_ISREG(mode)) {
170 inode->i_op = &gfs2_file_iops;
171 inode->i_fop = &gfs2_file_fops;
172 inode->i_mapping->a_ops = &gfs2_file_aops;
173 } else if (S_ISDIR(mode)) {
174 inode->i_op = &gfs2_dir_iops;
175 inode->i_fop = &gfs2_dir_fops;
176 } else if (S_ISLNK(mode)) {
177 inode->i_op = &gfs2_symlink_iops;
178 } else {
179 inode->i_op = &gfs2_dev_iops;
180 }
181
182 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
183 if (unlikely(error))
184 goto fail;
185 ip->i_gl->gl_object = ip;
186
187 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
188 if (unlikely(error))
189 goto fail_put;
190
191 ip->i_vn = ip->i_gl->gl_vn - 1;
192 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
193 if (unlikely(error))
194 goto fail_iopen;
195
196 gfs2_glock_put(io_gl);
197 unlock_new_inode(inode);
198 }
199
200 return inode;
201 fail_iopen:
202 gfs2_glock_put(io_gl);
203 fail_put:
204 ip->i_gl->gl_object = NULL;
205 gfs2_glock_put(ip->i_gl);
206 fail:
207 iput(inode);
208 return ERR_PTR(error);
209 }
210
211 static void gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
212 {
213 struct gfs2_dinode_host *di = &ip->i_di;
214 const struct gfs2_dinode *str = buf;
215
216 gfs2_meta_header_in(&di->di_header, buf);
217 gfs2_inum_in(&di->di_num, &str->di_num);
218
219 di->di_mode = be32_to_cpu(str->di_mode);
220 di->di_uid = be32_to_cpu(str->di_uid);
221 di->di_gid = be32_to_cpu(str->di_gid);
222 di->di_nlink = be32_to_cpu(str->di_nlink);
223 di->di_size = be64_to_cpu(str->di_size);
224 di->di_blocks = be64_to_cpu(str->di_blocks);
225 di->di_atime = be64_to_cpu(str->di_atime);
226 di->di_mtime = be64_to_cpu(str->di_mtime);
227 di->di_ctime = be64_to_cpu(str->di_ctime);
228 di->di_major = be32_to_cpu(str->di_major);
229 di->di_minor = be32_to_cpu(str->di_minor);
230
231 di->di_goal_meta = be64_to_cpu(str->di_goal_meta);
232 di->di_goal_data = be64_to_cpu(str->di_goal_data);
233 di->di_generation = be64_to_cpu(str->di_generation);
234
235 di->di_flags = be32_to_cpu(str->di_flags);
236 di->di_payload_format = be32_to_cpu(str->di_payload_format);
237 di->di_height = be16_to_cpu(str->di_height);
238
239 di->di_depth = be16_to_cpu(str->di_depth);
240 di->di_entries = be32_to_cpu(str->di_entries);
241
242 di->di_eattr = be64_to_cpu(str->di_eattr);
243 }
244
245 /**
246 * gfs2_inode_refresh - Refresh the incore copy of the dinode
247 * @ip: The GFS2 inode
248 *
249 * Returns: errno
250 */
251
252 int gfs2_inode_refresh(struct gfs2_inode *ip)
253 {
254 struct buffer_head *dibh;
255 int error;
256
257 error = gfs2_meta_inode_buffer(ip, &dibh);
258 if (error)
259 return error;
260
261 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
262 brelse(dibh);
263 return -EIO;
264 }
265
266 gfs2_dinode_in(ip, dibh->b_data);
267
268 brelse(dibh);
269
270 if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) {
271 if (gfs2_consist_inode(ip))
272 gfs2_dinode_print(&ip->i_di);
273 return -EIO;
274 }
275 if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino)
276 return -ESTALE;
277
278 ip->i_vn = ip->i_gl->gl_vn;
279
280 return 0;
281 }
282
283 int gfs2_dinode_dealloc(struct gfs2_inode *ip)
284 {
285 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
286 struct gfs2_alloc *al;
287 struct gfs2_rgrpd *rgd;
288 int error;
289
290 if (ip->i_di.di_blocks != 1) {
291 if (gfs2_consist_inode(ip))
292 gfs2_dinode_print(&ip->i_di);
293 return -EIO;
294 }
295
296 al = gfs2_alloc_get(ip);
297
298 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
299 if (error)
300 goto out;
301
302 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
303 if (error)
304 goto out_qs;
305
306 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
307 if (!rgd) {
308 gfs2_consist_inode(ip);
309 error = -EIO;
310 goto out_rindex_relse;
311 }
312
313 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
314 &al->al_rgd_gh);
315 if (error)
316 goto out_rindex_relse;
317
318 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1);
319 if (error)
320 goto out_rg_gunlock;
321
322 gfs2_trans_add_gl(ip->i_gl);
323
324 gfs2_free_di(rgd, ip);
325
326 gfs2_trans_end(sdp);
327 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
328
329 out_rg_gunlock:
330 gfs2_glock_dq_uninit(&al->al_rgd_gh);
331 out_rindex_relse:
332 gfs2_glock_dq_uninit(&al->al_ri_gh);
333 out_qs:
334 gfs2_quota_unhold(ip);
335 out:
336 gfs2_alloc_put(ip);
337 return error;
338 }
339
340 /**
341 * gfs2_change_nlink - Change nlink count on inode
342 * @ip: The GFS2 inode
343 * @diff: The change in the nlink count required
344 *
345 * Returns: errno
346 */
347
348 int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
349 {
350 struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info;
351 struct buffer_head *dibh;
352 u32 nlink;
353 int error;
354
355 BUG_ON(ip->i_di.di_nlink != ip->i_inode.i_nlink);
356 nlink = ip->i_di.di_nlink + diff;
357
358 /* If we are reducing the nlink count, but the new value ends up being
359 bigger than the old one, we must have underflowed. */
360 if (diff < 0 && nlink > ip->i_di.di_nlink) {
361 if (gfs2_consist_inode(ip))
362 gfs2_dinode_print(&ip->i_di);
363 return -EIO;
364 }
365
366 error = gfs2_meta_inode_buffer(ip, &dibh);
367 if (error)
368 return error;
369
370 ip->i_di.di_nlink = nlink;
371 ip->i_di.di_ctime = get_seconds();
372 ip->i_inode.i_nlink = nlink;
373
374 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
375 gfs2_dinode_out(ip, dibh->b_data);
376 brelse(dibh);
377 mark_inode_dirty(&ip->i_inode);
378
379 if (ip->i_di.di_nlink == 0) {
380 struct gfs2_rgrpd *rgd;
381 struct gfs2_holder ri_gh, rg_gh;
382
383 error = gfs2_rindex_hold(sdp, &ri_gh);
384 if (error)
385 goto out;
386 error = -EIO;
387 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
388 if (!rgd)
389 goto out_norgrp;
390 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
391 if (error)
392 goto out_norgrp;
393
394 clear_nlink(&ip->i_inode);
395 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
396 gfs2_glock_dq_uninit(&rg_gh);
397 out_norgrp:
398 gfs2_glock_dq_uninit(&ri_gh);
399 }
400 out:
401 return error;
402 }
403
404 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
405 {
406 struct qstr qstr;
407 gfs2_str2qstr(&qstr, name);
408 return gfs2_lookupi(dip, &qstr, 1, NULL);
409 }
410
411
412 /**
413 * gfs2_lookupi - Look up a filename in a directory and return its inode
414 * @d_gh: An initialized holder for the directory glock
415 * @name: The name of the inode to look for
416 * @is_root: If 1, ignore the caller's permissions
417 * @i_gh: An uninitialized holder for the new inode glock
418 *
419 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
420 * @is_root is true.
421 *
422 * Returns: errno
423 */
424
425 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
426 int is_root, struct nameidata *nd)
427 {
428 struct super_block *sb = dir->i_sb;
429 struct gfs2_inode *dip = GFS2_I(dir);
430 struct gfs2_holder d_gh;
431 struct gfs2_inum_host inum;
432 unsigned int type;
433 int error = 0;
434 struct inode *inode = NULL;
435
436 if (!name->len || name->len > GFS2_FNAMESIZE)
437 return ERR_PTR(-ENAMETOOLONG);
438
439 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
440 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
441 dir == sb->s_root->d_inode)) {
442 igrab(dir);
443 return dir;
444 }
445
446 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
447 if (error)
448 return ERR_PTR(error);
449
450 if (!is_root) {
451 error = permission(dir, MAY_EXEC, NULL);
452 if (error)
453 goto out;
454 }
455
456 error = gfs2_dir_search(dir, name, &inum, &type);
457 if (error)
458 goto out;
459
460 inode = gfs2_inode_lookup(sb, &inum, type);
461
462 out:
463 gfs2_glock_dq_uninit(&d_gh);
464 if (error == -ENOENT)
465 return NULL;
466 return inode;
467 }
468
469 static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino)
470 {
471 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
472 struct buffer_head *bh;
473 struct gfs2_inum_range_host ir;
474 int error;
475
476 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
477 if (error)
478 return error;
479 mutex_lock(&sdp->sd_inum_mutex);
480
481 error = gfs2_meta_inode_buffer(ip, &bh);
482 if (error) {
483 mutex_unlock(&sdp->sd_inum_mutex);
484 gfs2_trans_end(sdp);
485 return error;
486 }
487
488 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
489
490 if (ir.ir_length) {
491 *formal_ino = ir.ir_start++;
492 ir.ir_length--;
493 gfs2_trans_add_bh(ip->i_gl, bh, 1);
494 gfs2_inum_range_out(&ir,
495 bh->b_data + sizeof(struct gfs2_dinode));
496 brelse(bh);
497 mutex_unlock(&sdp->sd_inum_mutex);
498 gfs2_trans_end(sdp);
499 return 0;
500 }
501
502 brelse(bh);
503
504 mutex_unlock(&sdp->sd_inum_mutex);
505 gfs2_trans_end(sdp);
506
507 return 1;
508 }
509
510 static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino)
511 {
512 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
513 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
514 struct gfs2_holder gh;
515 struct buffer_head *bh;
516 struct gfs2_inum_range_host ir;
517 int error;
518
519 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
520 if (error)
521 return error;
522
523 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
524 if (error)
525 goto out;
526 mutex_lock(&sdp->sd_inum_mutex);
527
528 error = gfs2_meta_inode_buffer(ip, &bh);
529 if (error)
530 goto out_end_trans;
531
532 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
533
534 if (!ir.ir_length) {
535 struct buffer_head *m_bh;
536 u64 x, y;
537 __be64 z;
538
539 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
540 if (error)
541 goto out_brelse;
542
543 z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode));
544 x = y = be64_to_cpu(z);
545 ir.ir_start = x;
546 ir.ir_length = GFS2_INUM_QUANTUM;
547 x += GFS2_INUM_QUANTUM;
548 if (x < y)
549 gfs2_consist_inode(m_ip);
550 z = cpu_to_be64(x);
551 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
552 *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z;
553
554 brelse(m_bh);
555 }
556
557 *formal_ino = ir.ir_start++;
558 ir.ir_length--;
559
560 gfs2_trans_add_bh(ip->i_gl, bh, 1);
561 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
562
563 out_brelse:
564 brelse(bh);
565 out_end_trans:
566 mutex_unlock(&sdp->sd_inum_mutex);
567 gfs2_trans_end(sdp);
568 out:
569 gfs2_glock_dq_uninit(&gh);
570 return error;
571 }
572
573 static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum)
574 {
575 int error;
576
577 error = pick_formal_ino_1(sdp, inum);
578 if (error <= 0)
579 return error;
580
581 error = pick_formal_ino_2(sdp, inum);
582
583 return error;
584 }
585
586 /**
587 * create_ok - OK to create a new on-disk inode here?
588 * @dip: Directory in which dinode is to be created
589 * @name: Name of new dinode
590 * @mode:
591 *
592 * Returns: errno
593 */
594
595 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
596 unsigned int mode)
597 {
598 int error;
599
600 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
601 if (error)
602 return error;
603
604 /* Don't create entries in an unlinked directory */
605 if (!dip->i_di.di_nlink)
606 return -EPERM;
607
608 error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
609 switch (error) {
610 case -ENOENT:
611 error = 0;
612 break;
613 case 0:
614 return -EEXIST;
615 default:
616 return error;
617 }
618
619 if (dip->i_di.di_entries == (u32)-1)
620 return -EFBIG;
621 if (S_ISDIR(mode) && dip->i_di.di_nlink == (u32)-1)
622 return -EMLINK;
623
624 return 0;
625 }
626
627 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
628 unsigned int *uid, unsigned int *gid)
629 {
630 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
631 (dip->i_di.di_mode & S_ISUID) && dip->i_di.di_uid) {
632 if (S_ISDIR(*mode))
633 *mode |= S_ISUID;
634 else if (dip->i_di.di_uid != current->fsuid)
635 *mode &= ~07111;
636 *uid = dip->i_di.di_uid;
637 } else
638 *uid = current->fsuid;
639
640 if (dip->i_di.di_mode & S_ISGID) {
641 if (S_ISDIR(*mode))
642 *mode |= S_ISGID;
643 *gid = dip->i_di.di_gid;
644 } else
645 *gid = current->fsgid;
646 }
647
648 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum_host *inum,
649 u64 *generation)
650 {
651 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
652 int error;
653
654 gfs2_alloc_get(dip);
655
656 dip->i_alloc.al_requested = RES_DINODE;
657 error = gfs2_inplace_reserve(dip);
658 if (error)
659 goto out;
660
661 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
662 if (error)
663 goto out_ipreserv;
664
665 inum->no_addr = gfs2_alloc_di(dip, generation);
666
667 gfs2_trans_end(sdp);
668
669 out_ipreserv:
670 gfs2_inplace_release(dip);
671 out:
672 gfs2_alloc_put(dip);
673 return error;
674 }
675
676 /**
677 * init_dinode - Fill in a new dinode structure
678 * @dip: the directory this inode is being created in
679 * @gl: The glock covering the new inode
680 * @inum: the inode number
681 * @mode: the file permissions
682 * @uid:
683 * @gid:
684 *
685 */
686
687 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
688 const struct gfs2_inum_host *inum, unsigned int mode,
689 unsigned int uid, unsigned int gid,
690 const u64 *generation)
691 {
692 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
693 struct gfs2_dinode *di;
694 struct buffer_head *dibh;
695
696 dibh = gfs2_meta_new(gl, inum->no_addr);
697 gfs2_trans_add_bh(gl, dibh, 1);
698 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
699 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
700 di = (struct gfs2_dinode *)dibh->b_data;
701
702 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
703 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
704 di->di_mode = cpu_to_be32(mode);
705 di->di_uid = cpu_to_be32(uid);
706 di->di_gid = cpu_to_be32(gid);
707 di->di_nlink = cpu_to_be32(0);
708 di->di_size = cpu_to_be64(0);
709 di->di_blocks = cpu_to_be64(1);
710 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
711 di->di_major = di->di_minor = cpu_to_be32(0);
712 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
713 di->di_generation = cpu_to_be64(*generation);
714 di->di_flags = cpu_to_be32(0);
715
716 if (S_ISREG(mode)) {
717 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
718 gfs2_tune_get(sdp, gt_new_files_jdata))
719 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
720 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
721 gfs2_tune_get(sdp, gt_new_files_directio))
722 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
723 } else if (S_ISDIR(mode)) {
724 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
725 GFS2_DIF_INHERIT_DIRECTIO);
726 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
727 GFS2_DIF_INHERIT_JDATA);
728 }
729
730 di->__pad1 = 0;
731 di->di_payload_format = cpu_to_be32(0);
732 di->di_height = cpu_to_be32(0);
733 di->__pad2 = 0;
734 di->__pad3 = 0;
735 di->di_depth = cpu_to_be16(0);
736 di->di_entries = cpu_to_be32(0);
737 memset(&di->__pad4, 0, sizeof(di->__pad4));
738 di->di_eattr = cpu_to_be64(0);
739 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
740
741 brelse(dibh);
742 }
743
744 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
745 unsigned int mode, const struct gfs2_inum_host *inum,
746 const u64 *generation)
747 {
748 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
749 unsigned int uid, gid;
750 int error;
751
752 munge_mode_uid_gid(dip, &mode, &uid, &gid);
753 gfs2_alloc_get(dip);
754
755 error = gfs2_quota_lock(dip, uid, gid);
756 if (error)
757 goto out;
758
759 error = gfs2_quota_check(dip, uid, gid);
760 if (error)
761 goto out_quota;
762
763 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
764 if (error)
765 goto out_quota;
766
767 init_dinode(dip, gl, inum, mode, uid, gid, generation);
768 gfs2_quota_change(dip, +1, uid, gid);
769 gfs2_trans_end(sdp);
770
771 out_quota:
772 gfs2_quota_unlock(dip);
773 out:
774 gfs2_alloc_put(dip);
775 return error;
776 }
777
778 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
779 struct gfs2_inode *ip)
780 {
781 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
782 struct gfs2_alloc *al;
783 int alloc_required;
784 struct buffer_head *dibh;
785 int error;
786
787 al = gfs2_alloc_get(dip);
788
789 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
790 if (error)
791 goto fail;
792
793 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
794 if (alloc_required < 0)
795 goto fail;
796 if (alloc_required) {
797 error = gfs2_quota_check(dip, dip->i_di.di_uid,
798 dip->i_di.di_gid);
799 if (error)
800 goto fail_quota_locks;
801
802 al->al_requested = sdp->sd_max_dirres;
803
804 error = gfs2_inplace_reserve(dip);
805 if (error)
806 goto fail_quota_locks;
807
808 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
809 al->al_rgd->rd_ri.ri_length +
810 2 * RES_DINODE +
811 RES_STATFS + RES_QUOTA, 0);
812 if (error)
813 goto fail_ipreserv;
814 } else {
815 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
816 if (error)
817 goto fail_quota_locks;
818 }
819
820 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode));
821 if (error)
822 goto fail_end_trans;
823
824 error = gfs2_meta_inode_buffer(ip, &dibh);
825 if (error)
826 goto fail_end_trans;
827 ip->i_di.di_nlink = 1;
828 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
829 gfs2_dinode_out(ip, dibh->b_data);
830 brelse(dibh);
831 return 0;
832
833 fail_end_trans:
834 gfs2_trans_end(sdp);
835
836 fail_ipreserv:
837 if (dip->i_alloc.al_rgd)
838 gfs2_inplace_release(dip);
839
840 fail_quota_locks:
841 gfs2_quota_unlock(dip);
842
843 fail:
844 gfs2_alloc_put(dip);
845 return error;
846 }
847
848 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip)
849 {
850 int err;
851 size_t len;
852 void *value;
853 char *name;
854 struct gfs2_ea_request er;
855
856 err = security_inode_init_security(&ip->i_inode, &dip->i_inode,
857 &name, &value, &len);
858
859 if (err) {
860 if (err == -EOPNOTSUPP)
861 return 0;
862 return err;
863 }
864
865 memset(&er, 0, sizeof(struct gfs2_ea_request));
866
867 er.er_type = GFS2_EATYPE_SECURITY;
868 er.er_name = name;
869 er.er_data = value;
870 er.er_name_len = strlen(name);
871 er.er_data_len = len;
872
873 err = gfs2_ea_set_i(ip, &er);
874
875 kfree(value);
876 kfree(name);
877
878 return err;
879 }
880
881 /**
882 * gfs2_createi - Create a new inode
883 * @ghs: An array of two holders
884 * @name: The name of the new file
885 * @mode: the permissions on the new inode
886 *
887 * @ghs[0] is an initialized holder for the directory
888 * @ghs[1] is the holder for the inode lock
889 *
890 * If the return value is not NULL, the glocks on both the directory and the new
891 * file are held. A transaction has been started and an inplace reservation
892 * is held, as well.
893 *
894 * Returns: An inode
895 */
896
897 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
898 unsigned int mode)
899 {
900 struct inode *inode;
901 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
902 struct inode *dir = &dip->i_inode;
903 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
904 struct gfs2_inum_host inum;
905 int error;
906 u64 generation;
907
908 if (!name->len || name->len > GFS2_FNAMESIZE)
909 return ERR_PTR(-ENAMETOOLONG);
910
911 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
912 error = gfs2_glock_nq(ghs);
913 if (error)
914 goto fail;
915
916 error = create_ok(dip, name, mode);
917 if (error)
918 goto fail_gunlock;
919
920 error = pick_formal_ino(sdp, &inum.no_formal_ino);
921 if (error)
922 goto fail_gunlock;
923
924 error = alloc_dinode(dip, &inum, &generation);
925 if (error)
926 goto fail_gunlock;
927
928 if (inum.no_addr < dip->i_num.no_addr) {
929 gfs2_glock_dq(ghs);
930
931 error = gfs2_glock_nq_num(sdp, inum.no_addr,
932 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
933 GL_SKIP, ghs + 1);
934 if (error) {
935 return ERR_PTR(error);
936 }
937
938 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
939 error = gfs2_glock_nq(ghs);
940 if (error) {
941 gfs2_glock_dq_uninit(ghs + 1);
942 return ERR_PTR(error);
943 }
944
945 error = create_ok(dip, name, mode);
946 if (error)
947 goto fail_gunlock2;
948 } else {
949 error = gfs2_glock_nq_num(sdp, inum.no_addr,
950 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
951 GL_SKIP, ghs + 1);
952 if (error)
953 goto fail_gunlock;
954 }
955
956 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation);
957 if (error)
958 goto fail_gunlock2;
959
960 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode));
961 if (IS_ERR(inode))
962 goto fail_gunlock2;
963
964 error = gfs2_inode_refresh(GFS2_I(inode));
965 if (error)
966 goto fail_iput;
967
968 error = gfs2_acl_create(dip, GFS2_I(inode));
969 if (error)
970 goto fail_iput;
971
972 error = gfs2_security_init(dip, GFS2_I(inode));
973 if (error)
974 goto fail_iput;
975
976 error = link_dinode(dip, name, GFS2_I(inode));
977 if (error)
978 goto fail_iput;
979
980 if (!inode)
981 return ERR_PTR(-ENOMEM);
982 return inode;
983
984 fail_iput:
985 iput(inode);
986 fail_gunlock2:
987 gfs2_glock_dq_uninit(ghs + 1);
988 fail_gunlock:
989 gfs2_glock_dq(ghs);
990 fail:
991 return ERR_PTR(error);
992 }
993
994 /**
995 * gfs2_rmdiri - Remove a directory
996 * @dip: The parent directory of the directory to be removed
997 * @name: The name of the directory to be removed
998 * @ip: The GFS2 inode of the directory to be removed
999 *
1000 * Assumes Glocks on dip and ip are held
1001 *
1002 * Returns: errno
1003 */
1004
1005 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
1006 struct gfs2_inode *ip)
1007 {
1008 struct qstr dotname;
1009 int error;
1010
1011 if (ip->i_di.di_entries != 2) {
1012 if (gfs2_consist_inode(ip))
1013 gfs2_dinode_print(&ip->i_di);
1014 return -EIO;
1015 }
1016
1017 error = gfs2_dir_del(dip, name);
1018 if (error)
1019 return error;
1020
1021 error = gfs2_change_nlink(dip, -1);
1022 if (error)
1023 return error;
1024
1025 gfs2_str2qstr(&dotname, ".");
1026 error = gfs2_dir_del(ip, &dotname);
1027 if (error)
1028 return error;
1029
1030 gfs2_str2qstr(&dotname, "..");
1031 error = gfs2_dir_del(ip, &dotname);
1032 if (error)
1033 return error;
1034
1035 error = gfs2_change_nlink(ip, -2);
1036 if (error)
1037 return error;
1038
1039 return error;
1040 }
1041
1042 /*
1043 * gfs2_unlink_ok - check to see that a inode is still in a directory
1044 * @dip: the directory
1045 * @name: the name of the file
1046 * @ip: the inode
1047 *
1048 * Assumes that the lock on (at least) @dip is held.
1049 *
1050 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1051 */
1052
1053 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1054 struct gfs2_inode *ip)
1055 {
1056 struct gfs2_inum_host inum;
1057 unsigned int type;
1058 int error;
1059
1060 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1061 return -EPERM;
1062
1063 if ((dip->i_di.di_mode & S_ISVTX) &&
1064 dip->i_di.di_uid != current->fsuid &&
1065 ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER))
1066 return -EPERM;
1067
1068 if (IS_APPEND(&dip->i_inode))
1069 return -EPERM;
1070
1071 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
1072 if (error)
1073 return error;
1074
1075 error = gfs2_dir_search(&dip->i_inode, name, &inum, &type);
1076 if (error)
1077 return error;
1078
1079 if (!gfs2_inum_equal(&inum, &ip->i_num))
1080 return -ENOENT;
1081
1082 if (IF2DT(ip->i_di.di_mode) != type) {
1083 gfs2_consist_inode(dip);
1084 return -EIO;
1085 }
1086
1087 return 0;
1088 }
1089
1090 /*
1091 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1092 * @this: move this
1093 * @to: to here
1094 *
1095 * Follow @to back to the root and make sure we don't encounter @this
1096 * Assumes we already hold the rename lock.
1097 *
1098 * Returns: errno
1099 */
1100
1101 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1102 {
1103 struct inode *dir = &to->i_inode;
1104 struct super_block *sb = dir->i_sb;
1105 struct inode *tmp;
1106 struct qstr dotdot;
1107 int error = 0;
1108
1109 gfs2_str2qstr(&dotdot, "..");
1110
1111 igrab(dir);
1112
1113 for (;;) {
1114 if (dir == &this->i_inode) {
1115 error = -EINVAL;
1116 break;
1117 }
1118 if (dir == sb->s_root->d_inode) {
1119 error = 0;
1120 break;
1121 }
1122
1123 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1124 if (IS_ERR(tmp)) {
1125 error = PTR_ERR(tmp);
1126 break;
1127 }
1128
1129 iput(dir);
1130 dir = tmp;
1131 }
1132
1133 iput(dir);
1134
1135 return error;
1136 }
1137
1138 /**
1139 * gfs2_readlinki - return the contents of a symlink
1140 * @ip: the symlink's inode
1141 * @buf: a pointer to the buffer to be filled
1142 * @len: a pointer to the length of @buf
1143 *
1144 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1145 * to be freed by the caller.
1146 *
1147 * Returns: errno
1148 */
1149
1150 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1151 {
1152 struct gfs2_holder i_gh;
1153 struct buffer_head *dibh;
1154 unsigned int x;
1155 int error;
1156
1157 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1158 error = gfs2_glock_nq_atime(&i_gh);
1159 if (error) {
1160 gfs2_holder_uninit(&i_gh);
1161 return error;
1162 }
1163
1164 if (!ip->i_di.di_size) {
1165 gfs2_consist_inode(ip);
1166 error = -EIO;
1167 goto out;
1168 }
1169
1170 error = gfs2_meta_inode_buffer(ip, &dibh);
1171 if (error)
1172 goto out;
1173
1174 x = ip->i_di.di_size + 1;
1175 if (x > *len) {
1176 *buf = kmalloc(x, GFP_KERNEL);
1177 if (!*buf) {
1178 error = -ENOMEM;
1179 goto out_brelse;
1180 }
1181 }
1182
1183 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1184 *len = x;
1185
1186 out_brelse:
1187 brelse(dibh);
1188 out:
1189 gfs2_glock_dq_uninit(&i_gh);
1190 return error;
1191 }
1192
1193 /**
1194 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1195 * conditionally update the inode's atime
1196 * @gh: the holder to acquire
1197 *
1198 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1199 * Update if the difference between the current time and the inode's current
1200 * atime is greater than an interval specified at mount.
1201 *
1202 * Returns: errno
1203 */
1204
1205 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1206 {
1207 struct gfs2_glock *gl = gh->gh_gl;
1208 struct gfs2_sbd *sdp = gl->gl_sbd;
1209 struct gfs2_inode *ip = gl->gl_object;
1210 s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1211 unsigned int state;
1212 int flags;
1213 int error;
1214
1215 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1216 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1217 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1218 return -EINVAL;
1219
1220 state = gh->gh_state;
1221 flags = gh->gh_flags;
1222
1223 error = gfs2_glock_nq(gh);
1224 if (error)
1225 return error;
1226
1227 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1228 (sdp->sd_vfs->s_flags & MS_RDONLY))
1229 return 0;
1230
1231 curtime = get_seconds();
1232 if (curtime - ip->i_di.di_atime >= quantum) {
1233 gfs2_glock_dq(gh);
1234 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1235 gh);
1236 error = gfs2_glock_nq(gh);
1237 if (error)
1238 return error;
1239
1240 /* Verify that atime hasn't been updated while we were
1241 trying to get exclusive lock. */
1242
1243 curtime = get_seconds();
1244 if (curtime - ip->i_di.di_atime >= quantum) {
1245 struct buffer_head *dibh;
1246 struct gfs2_dinode *di;
1247
1248 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1249 if (error == -EROFS)
1250 return 0;
1251 if (error)
1252 goto fail;
1253
1254 error = gfs2_meta_inode_buffer(ip, &dibh);
1255 if (error)
1256 goto fail_end_trans;
1257
1258 ip->i_di.di_atime = curtime;
1259
1260 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1261 di = (struct gfs2_dinode *)dibh->b_data;
1262 di->di_atime = cpu_to_be64(ip->i_di.di_atime);
1263 brelse(dibh);
1264
1265 gfs2_trans_end(sdp);
1266 }
1267
1268 /* If someone else has asked for the glock,
1269 unlock and let them have it. Then reacquire
1270 in the original state. */
1271 if (gfs2_glock_is_blocking(gl)) {
1272 gfs2_glock_dq(gh);
1273 gfs2_holder_reinit(state, flags, gh);
1274 return gfs2_glock_nq(gh);
1275 }
1276 }
1277
1278 return 0;
1279
1280 fail_end_trans:
1281 gfs2_trans_end(sdp);
1282 fail:
1283 gfs2_glock_dq(gh);
1284 return error;
1285 }
1286
1287 /**
1288 * glock_compare_atime - Compare two struct gfs2_glock structures for sort
1289 * @arg_a: the first structure
1290 * @arg_b: the second structure
1291 *
1292 * Returns: 1 if A > B
1293 * -1 if A < B
1294 * 0 if A == B
1295 */
1296
1297 static int glock_compare_atime(const void *arg_a, const void *arg_b)
1298 {
1299 const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a;
1300 const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b;
1301 const struct lm_lockname *a = &gh_a->gh_gl->gl_name;
1302 const struct lm_lockname *b = &gh_b->gh_gl->gl_name;
1303
1304 if (a->ln_number > b->ln_number)
1305 return 1;
1306 if (a->ln_number < b->ln_number)
1307 return -1;
1308 if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE)
1309 return 1;
1310 if (gh_a->gh_state == LM_ST_SHARED && (gh_b->gh_flags & GL_ATIME))
1311 return 1;
1312
1313 return 0;
1314 }
1315
1316 /**
1317 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
1318 * atime update
1319 * @num_gh: the number of structures
1320 * @ghs: an array of struct gfs2_holder structures
1321 *
1322 * Returns: 0 on success (all glocks acquired),
1323 * errno on failure (no glocks acquired)
1324 */
1325
1326 int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
1327 {
1328 struct gfs2_holder **p;
1329 unsigned int x;
1330 int error = 0;
1331
1332 if (!num_gh)
1333 return 0;
1334
1335 if (num_gh == 1) {
1336 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1337 if (ghs->gh_flags & GL_ATIME)
1338 error = gfs2_glock_nq_atime(ghs);
1339 else
1340 error = gfs2_glock_nq(ghs);
1341 return error;
1342 }
1343
1344 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
1345 if (!p)
1346 return -ENOMEM;
1347
1348 for (x = 0; x < num_gh; x++)
1349 p[x] = &ghs[x];
1350
1351 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
1352
1353 for (x = 0; x < num_gh; x++) {
1354 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1355
1356 if (p[x]->gh_flags & GL_ATIME)
1357 error = gfs2_glock_nq_atime(p[x]);
1358 else
1359 error = gfs2_glock_nq(p[x]);
1360
1361 if (error) {
1362 while (x--)
1363 gfs2_glock_dq(p[x]);
1364 break;
1365 }
1366 }
1367
1368 kfree(p);
1369 return error;
1370 }
1371
1372
1373 static int
1374 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1375 {
1376 struct buffer_head *dibh;
1377 int error;
1378
1379 error = gfs2_meta_inode_buffer(ip, &dibh);
1380 if (!error) {
1381 error = inode_setattr(&ip->i_inode, attr);
1382 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1383 gfs2_inode_attr_out(ip);
1384
1385 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1386 gfs2_dinode_out(ip, dibh->b_data);
1387 brelse(dibh);
1388 }
1389 return error;
1390 }
1391
1392 /**
1393 * gfs2_setattr_simple -
1394 * @ip:
1395 * @attr:
1396 *
1397 * Called with a reference on the vnode.
1398 *
1399 * Returns: errno
1400 */
1401
1402 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1403 {
1404 int error;
1405
1406 if (current->journal_info)
1407 return __gfs2_setattr_simple(ip, attr);
1408
1409 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1410 if (error)
1411 return error;
1412
1413 error = __gfs2_setattr_simple(ip, attr);
1414 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1415 return error;
1416 }
1417
kmemtrace - Kernel memory tracer