inode.c 27.5 KB
Newer Older
David Teigland's avatar
David Teigland committed
1
2
/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
Bob Peterson's avatar
Bob Peterson committed
3
 * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
David Teigland's avatar
David Teigland committed
4
5
6
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
7
 * of the GNU General Public License version 2.
David Teigland's avatar
David Teigland committed
8
9
10
11
12
13
14
15
16
 */

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/posix_acl.h>
#include <linux/sort.h>
17
#include <linux/gfs2_ondisk.h>
18
#include <linux/crc32.h>
19
#include <linux/security.h>
20
#include <linux/time.h>
David Teigland's avatar
David Teigland committed
21
22

#include "gfs2.h"
23
#include "incore.h"
David Teigland's avatar
David Teigland committed
24
25
26
#include "acl.h"
#include "bmap.h"
#include "dir.h"
27
#include "xattr.h"
David Teigland's avatar
David Teigland committed
28
29
30
31
32
33
34
35
#include "glock.h"
#include "glops.h"
#include "inode.h"
#include "log.h"
#include "meta_io.h"
#include "quota.h"
#include "rgrp.h"
#include "trans.h"
36
#include "util.h"
David Teigland's avatar
David Teigland committed
37

38
39
40
41
42
struct gfs2_inum_range_host {
	u64 ir_start;
	u64 ir_length;
};

43
44
45
static int iget_test(struct inode *inode, void *opaque)
{
	struct gfs2_inode *ip = GFS2_I(inode);
46
	u64 *no_addr = opaque;
47

48
	if (ip->i_no_addr == *no_addr && test_bit(GIF_USER, &ip->i_flags))
49
		return 1;
David Teigland's avatar
David Teigland committed
50

51
52
53
54
	return 0;
}

static int iget_set(struct inode *inode, void *opaque)
David Teigland's avatar
David Teigland committed
55
{
56
	struct gfs2_inode *ip = GFS2_I(inode);
57
	u64 *no_addr = opaque;
David Teigland's avatar
David Teigland committed
58

59
60
	inode->i_ino = (unsigned long)*no_addr;
	ip->i_no_addr = *no_addr;
61
	set_bit(GIF_USER, &ip->i_flags);
62
63
	return 0;
}
David Teigland's avatar
David Teigland committed
64

65
struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr)
66
{
67
68
	unsigned long hash = (unsigned long)no_addr;
	return ilookup5(sb, hash, iget_test, &no_addr);
69
}
David Teigland's avatar
David Teigland committed
70

71
static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
72
{
73
74
	unsigned long hash = (unsigned long)no_addr;
	return iget5_locked(sb, hash, iget_test, iget_set, &no_addr);
David Teigland's avatar
David Teigland committed
75
76
}

77
78
79
80
81
82
83
84
85
86
struct gfs2_skip_data {
	u64	no_addr;
	int	skipped;
};

static int iget_skip_test(struct inode *inode, void *opaque)
{
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_skip_data *data = opaque;

87
	if (ip->i_no_addr == data->no_addr && test_bit(GIF_USER, &ip->i_flags)){
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
		if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)){
			data->skipped = 1;
			return 0;
		}
		return 1;
	}
	return 0;
}

static int iget_skip_set(struct inode *inode, void *opaque)
{
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_skip_data *data = opaque;

	if (data->skipped)
		return 1;
	inode->i_ino = (unsigned long)(data->no_addr);
	ip->i_no_addr = data->no_addr;
106
	set_bit(GIF_USER, &ip->i_flags);
107
108
109
110
111
112
113
114
115
116
117
118
119
120
	return 0;
}

static struct inode *gfs2_iget_skip(struct super_block *sb,
				    u64 no_addr)
{
	struct gfs2_skip_data data;
	unsigned long hash = (unsigned long)no_addr;

	data.no_addr = no_addr;
	data.skipped = 0;
	return iget5_locked(sb, hash, iget_skip_test, iget_skip_set, &data);
}

121
122
123
124
125
126
127
128
129
130
131
132
/**
 * GFS2 lookup code fills in vfs inode contents based on info obtained
 * from directory entry inside gfs2_inode_lookup(). This has caused issues
 * with NFS code path since its get_dentry routine doesn't have the relevant
 * directory entry when gfs2_inode_lookup() is invoked. Part of the code
 * segment inside gfs2_inode_lookup code needs to get moved around.
 *
 * Clean up I_LOCK and I_NEW as well.
 **/

void gfs2_set_iop(struct inode *inode)
{
133
	struct gfs2_sbd *sdp = GFS2_SB(inode);
134
135
136
137
	umode_t mode = inode->i_mode;

	if (S_ISREG(mode)) {
		inode->i_op = &gfs2_file_iops;
138
		if (gfs2_localflocks(sdp))
139
			inode->i_fop = &gfs2_file_fops_nolock;
140
		else
141
			inode->i_fop = &gfs2_file_fops;
142
143
	} else if (S_ISDIR(mode)) {
		inode->i_op = &gfs2_dir_iops;
144
		if (gfs2_localflocks(sdp))
145
			inode->i_fop = &gfs2_dir_fops_nolock;
146
		else
147
			inode->i_fop = &gfs2_dir_fops;
148
149
150
	} else if (S_ISLNK(mode)) {
		inode->i_op = &gfs2_symlink_iops;
	} else {
Denis Cheng's avatar
Denis Cheng committed
151
		inode->i_op = &gfs2_file_iops;
Denis Cheng's avatar
Denis Cheng committed
152
		init_special_inode(inode, inode->i_mode, inode->i_rdev);
153
154
155
156
157
	}

	unlock_new_inode(inode);
}

David Teigland's avatar
David Teigland committed
158
/**
159
160
 * gfs2_inode_lookup - Lookup an inode
 * @sb: The super block
161
 * @no_addr: The inode number
162
 * @type: The type of the inode
163
 * @skip_freeing: set this not return an inode if it is currently being freed.
David Teigland's avatar
David Teigland committed
164
 *
165
 * Returns: A VFS inode, or an error
David Teigland's avatar
David Teigland committed
166
167
 */

168
struct inode *gfs2_inode_lookup(struct super_block *sb,
169
170
				unsigned int type,
				u64 no_addr,
171
				u64 no_formal_ino, int skip_freeing)
David Teigland's avatar
David Teigland committed
172
{
173
174
	struct inode *inode;
	struct gfs2_inode *ip;
175
176
	struct gfs2_glock *io_gl;
	int error;
David Teigland's avatar
David Teigland committed
177

178
179
180
181
182
183
	if (skip_freeing)
		inode = gfs2_iget_skip(sb, no_addr);
	else
		inode = gfs2_iget(sb, no_addr);
	ip = GFS2_I(inode);

184
185
186
	if (!inode)
		return ERR_PTR(-ENOBUFS);

187
188
	if (inode->i_state & I_NEW) {
		struct gfs2_sbd *sdp = GFS2_SB(inode);
189
		ip->i_no_formal_ino = no_formal_ino;
David Teigland's avatar
David Teigland committed
190

191
		error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
192
193
194
		if (unlikely(error))
			goto fail;
		ip->i_gl->gl_object = ip;
David Teigland's avatar
David Teigland committed
195

196
		error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
197
198
		if (unlikely(error))
			goto fail_put;
David Teigland's avatar
David Teigland committed
199

200
		set_bit(GIF_INVALID, &ip->i_flags);
201
202
203
		error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
		if (unlikely(error))
			goto fail_iopen;
Abhijith Das's avatar
Abhijith Das committed
204
		ip->i_iopen_gh.gh_gl->gl_object = ip;
David Teigland's avatar
David Teigland committed
205

206
		gfs2_glock_put(io_gl);
207

208
209
210
211
212
		if ((type == DT_UNKNOWN) && (no_formal_ino == 0))
			goto gfs2_nfsbypass;

		inode->i_mode = DT2IF(type);

213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
		/*
		 * We must read the inode in order to work out its type in
		 * this case. Note that this doesn't happen often as we normally
		 * know the type beforehand. This code path only occurs during
		 * unlinked inode recovery (where it is safe to do this glock,
		 * which is not true in the general case).
		 */
		if (type == DT_UNKNOWN) {
			struct gfs2_holder gh;
			error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
			if (unlikely(error))
				goto fail_glock;
			/* Inode is now uptodate */
			gfs2_glock_dq_uninit(&gh);
		}

229
		gfs2_set_iop(inode);
230
	}
David Teigland's avatar
David Teigland committed
231

232
gfs2_nfsbypass:
David Teigland's avatar
David Teigland committed
233
	return inode;
234
235
fail_glock:
	gfs2_glock_dq(&ip->i_iopen_gh);
236
237
238
239
240
241
fail_iopen:
	gfs2_glock_put(io_gl);
fail_put:
	ip->i_gl->gl_object = NULL;
	gfs2_glock_put(ip->i_gl);
fail:
242
	iget_failed(inode);
243
	return ERR_PTR(error);
David Teigland's avatar
David Teigland committed
244
245
}

246
static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
247
248
{
	const struct gfs2_dinode *str = buf;
249
	struct timespec atime;
250
	u16 height, depth;
251

252
253
	if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)))
		goto corrupt;
254
	ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino);
255
	ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
256
	ip->i_inode.i_rdev = 0;
257
	switch (ip->i_inode.i_mode & S_IFMT) {
258
259
260
261
262
263
264
	case S_IFBLK:
	case S_IFCHR:
		ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
					   be32_to_cpu(str->di_minor));
		break;
	};

265
266
	ip->i_inode.i_uid = be32_to_cpu(str->di_uid);
	ip->i_inode.i_gid = be32_to_cpu(str->di_gid);
267
268
269
270
271
272
	/*
	 * We will need to review setting the nlink count here in the
	 * light of the forthcoming ro bind mount work. This is a reminder
	 * to do that.
	 */
	ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink);
273
274
	ip->i_disksize = be64_to_cpu(str->di_size);
	i_size_write(&ip->i_inode, ip->i_disksize);
275
	gfs2_set_inode_blocks(&ip->i_inode, be64_to_cpu(str->di_blocks));
276
277
278
279
	atime.tv_sec = be64_to_cpu(str->di_atime);
	atime.tv_nsec = be32_to_cpu(str->di_atime_nsec);
	if (timespec_compare(&ip->i_inode.i_atime, &atime) < 0)
		ip->i_inode.i_atime = atime;
280
	ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
281
	ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec);
282
	ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
283
	ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec);
284

285
	ip->i_goal = be64_to_cpu(str->di_goal_meta);
286
	ip->i_generation = be64_to_cpu(str->di_generation);
287

288
	ip->i_diskflags = be32_to_cpu(str->di_flags);
289
	gfs2_set_inode_flags(&ip->i_inode);
290
291
292
293
	height = be16_to_cpu(str->di_height);
	if (unlikely(height > GFS2_MAX_META_HEIGHT))
		goto corrupt;
	ip->i_height = (u8)height;
294

295
296
297
298
	depth = be16_to_cpu(str->di_depth);
	if (unlikely(depth > GFS2_DIR_MAX_DEPTH))
		goto corrupt;
	ip->i_depth = (u8)depth;
299
	ip->i_entries = be32_to_cpu(str->di_entries);
300

301
	ip->i_eattr = be64_to_cpu(str->di_eattr);
302
303
304
	if (S_ISREG(ip->i_inode.i_mode))
		gfs2_set_aops(&ip->i_inode);

305
	return 0;
306
307
308
309
corrupt:
	if (gfs2_consist_inode(ip))
		gfs2_dinode_print(ip);
	return -EIO;
310
311
}

David Teigland's avatar
David Teigland committed
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
/**
 * gfs2_inode_refresh - Refresh the incore copy of the dinode
 * @ip: The GFS2 inode
 *
 * Returns: errno
 */

int gfs2_inode_refresh(struct gfs2_inode *ip)
{
	struct buffer_head *dibh;
	int error;

	error = gfs2_meta_inode_buffer(ip, &dibh);
	if (error)
		return error;

328
	if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
David Teigland's avatar
David Teigland committed
329
330
331
332
		brelse(dibh);
		return -EIO;
	}

333
	error = gfs2_dinode_in(ip, dibh->b_data);
David Teigland's avatar
David Teigland committed
334
	brelse(dibh);
335
	clear_bit(GIF_INVALID, &ip->i_flags);
David Teigland's avatar
David Teigland committed
336

337
	return error;
David Teigland's avatar
David Teigland committed
338
339
}

340
int gfs2_dinode_dealloc(struct gfs2_inode *ip)
David Teigland's avatar
David Teigland committed
341
{
342
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teigland's avatar
David Teigland committed
343
344
345
346
	struct gfs2_alloc *al;
	struct gfs2_rgrpd *rgd;
	int error;

347
	if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
David Teigland's avatar
David Teigland committed
348
		if (gfs2_consist_inode(ip))
349
			gfs2_dinode_print(ip);
David Teigland's avatar
David Teigland committed
350
351
352
353
		return -EIO;
	}

	al = gfs2_alloc_get(ip);
354
355
	if (!al)
		return -ENOMEM;
David Teigland's avatar
David Teigland committed
356
357
358
359
360
361
362
363
364

	error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
	if (error)
		goto out;

	error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
	if (error)
		goto out_qs;

365
	rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
David Teigland's avatar
David Teigland committed
366
367
368
369
370
371
372
373
374
375
376
	if (!rgd) {
		gfs2_consist_inode(ip);
		error = -EIO;
		goto out_rindex_relse;
	}

	error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
				   &al->al_rgd_gh);
	if (error)
		goto out_rindex_relse;

377
	error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1);
David Teigland's avatar
David Teigland committed
378
379
380
	if (error)
		goto out_rg_gunlock;

381
382
	set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
	set_bit(GLF_LFLUSH, &ip->i_gl->gl_flags);
David Teigland's avatar
David Teigland committed
383
384
385
386
387

	gfs2_free_di(rgd, ip);

	gfs2_trans_end(sdp);

388
out_rg_gunlock:
David Teigland's avatar
David Teigland committed
389
	gfs2_glock_dq_uninit(&al->al_rgd_gh);
390
out_rindex_relse:
David Teigland's avatar
David Teigland committed
391
	gfs2_glock_dq_uninit(&al->al_ri_gh);
392
out_qs:
David Teigland's avatar
David Teigland committed
393
	gfs2_quota_unhold(ip);
394
out:
395
	gfs2_alloc_put(ip);
David Teigland's avatar
David Teigland committed
396
397
398
399
	return error;
}

/**
400
 * gfs2_change_nlink - Change nlink count on inode
David Teigland's avatar
David Teigland committed
401
402
403
404
405
 * @ip: The GFS2 inode
 * @diff: The change in the nlink count required
 *
 * Returns: errno
 */
406
int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
David Teigland's avatar
David Teigland committed
407
408
{
	struct buffer_head *dibh;
409
	u32 nlink;
David Teigland's avatar
David Teigland committed
410
411
	int error;

412
413
	BUG_ON(diff != 1 && diff != -1);
	nlink = ip->i_inode.i_nlink + diff;
David Teigland's avatar
David Teigland committed
414
415
416

	/* If we are reducing the nlink count, but the new value ends up being
	   bigger than the old one, we must have underflowed. */
417
	if (diff < 0 && nlink > ip->i_inode.i_nlink) {
David Teigland's avatar
David Teigland committed
418
		if (gfs2_consist_inode(ip))
419
			gfs2_dinode_print(ip);
David Teigland's avatar
David Teigland committed
420
421
422
423
424
425
426
		return -EIO;
	}

	error = gfs2_meta_inode_buffer(ip, &dibh);
	if (error)
		return error;

427
428
429
430
431
	if (diff > 0)
		inc_nlink(&ip->i_inode);
	else
		drop_nlink(&ip->i_inode);

432
	ip->i_inode.i_ctime = CURRENT_TIME;
David Teigland's avatar
David Teigland committed
433

434
	gfs2_trans_add_bh(ip->i_gl, dibh, 1);
435
	gfs2_dinode_out(ip, dibh->b_data);
David Teigland's avatar
David Teigland committed
436
	brelse(dibh);
437
	mark_inode_dirty(&ip->i_inode);
David Teigland's avatar
David Teigland committed
438

439
	if (ip->i_inode.i_nlink == 0)
Russell Cattelan's avatar
Russell Cattelan committed
440
		gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
441

442
443
444
	return error;
}

445
446
447
struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
{
	struct qstr qstr;
448
	struct inode *inode;
449
	gfs2_str2qstr(&qstr, name);
450
	inode = gfs2_lookupi(dip, &qstr, 1);
451
452
453
454
455
456
457
458
459
	/* gfs2_lookupi has inconsistent callers: vfs
	 * related routines expect NULL for no entry found,
	 * gfs2_lookup_simple callers expect ENOENT
	 * and do not check for NULL.
	 */
	if (inode == NULL)
		return ERR_PTR(-ENOENT);
	else
		return inode;
460
461
462
}


David Teigland's avatar
David Teigland committed
463
464
465
466
467
468
469
/**
 * gfs2_lookupi - Look up a filename in a directory and return its inode
 * @d_gh: An initialized holder for the directory glock
 * @name: The name of the inode to look for
 * @is_root: If 1, ignore the caller's permissions
 * @i_gh: An uninitialized holder for the new inode glock
 *
470
471
472
473
 * This can be called via the VFS filldir function when NFS is doing
 * a readdirplus and the inode which its intending to stat isn't
 * already in cache. In this case we must not take the directory glock
 * again, since the readdir call will have already taken that lock.
David Teigland's avatar
David Teigland committed
474
475
476
477
 *
 * Returns: errno
 */

478
struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
479
			   int is_root)
David Teigland's avatar
David Teigland committed
480
{
Steven Whitehouse's avatar
Steven Whitehouse committed
481
	struct super_block *sb = dir->i_sb;
482
	struct gfs2_inode *dip = GFS2_I(dir);
David Teigland's avatar
David Teigland committed
483
	struct gfs2_holder d_gh;
484
	int error = 0;
485
	struct inode *inode = NULL;
486
	int unlock = 0;
David Teigland's avatar
David Teigland committed
487
488

	if (!name->len || name->len > GFS2_FNAMESIZE)
489
		return ERR_PTR(-ENAMETOOLONG);
David Teigland's avatar
David Teigland committed
490

491
492
493
	if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
	    (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
	     dir == sb->s_root->d_inode)) {
494
495
		igrab(dir);
		return dir;
David Teigland's avatar
David Teigland committed
496
497
	}

498
	if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
499
500
501
502
503
		error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
		if (error)
			return ERR_PTR(error);
		unlock = 1;
	}
David Teigland's avatar
David Teigland committed
504
505

	if (!is_root) {
506
		error = gfs2_permission(dir, MAY_EXEC);
David Teigland's avatar
David Teigland committed
507
508
509
510
		if (error)
			goto out;
	}

511
512
513
	inode = gfs2_dir_search(dir, name);
	if (IS_ERR(inode))
		error = PTR_ERR(inode);
514
out:
515
516
	if (unlock)
		gfs2_glock_dq_uninit(&d_gh);
517
518
	if (error == -ENOENT)
		return NULL;
519
	return inode ? inode : ERR_PTR(error);
David Teigland's avatar
David Teigland committed
520
521
}

522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
static void gfs2_inum_range_in(struct gfs2_inum_range_host *ir, const void *buf)
{
	const struct gfs2_inum_range *str = buf;

	ir->ir_start = be64_to_cpu(str->ir_start);
	ir->ir_length = be64_to_cpu(str->ir_length);
}

static void gfs2_inum_range_out(const struct gfs2_inum_range_host *ir, void *buf)
{
	struct gfs2_inum_range *str = buf;

	str->ir_start = cpu_to_be64(ir->ir_start);
	str->ir_length = cpu_to_be64(ir->ir_length);
}

538
static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino)
David Teigland's avatar
David Teigland committed
539
{
540
	struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
David Teigland's avatar
David Teigland committed
541
	struct buffer_head *bh;
542
	struct gfs2_inum_range_host ir;
David Teigland's avatar
David Teigland committed
543
544
545
546
547
	int error;

	error = gfs2_trans_begin(sdp, RES_DINODE, 0);
	if (error)
		return error;
548
	mutex_lock(&sdp->sd_inum_mutex);
David Teigland's avatar
David Teigland committed
549
550
551

	error = gfs2_meta_inode_buffer(ip, &bh);
	if (error) {
552
		mutex_unlock(&sdp->sd_inum_mutex);
David Teigland's avatar
David Teigland committed
553
554
555
556
557
558
559
560
561
		gfs2_trans_end(sdp);
		return error;
	}

	gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));

	if (ir.ir_length) {
		*formal_ino = ir.ir_start++;
		ir.ir_length--;
562
		gfs2_trans_add_bh(ip->i_gl, bh, 1);
David Teigland's avatar
David Teigland committed
563
564
565
		gfs2_inum_range_out(&ir,
				    bh->b_data + sizeof(struct gfs2_dinode));
		brelse(bh);
566
		mutex_unlock(&sdp->sd_inum_mutex);
David Teigland's avatar
David Teigland committed
567
568
569
570
571
572
		gfs2_trans_end(sdp);
		return 0;
	}

	brelse(bh);

573
	mutex_unlock(&sdp->sd_inum_mutex);
David Teigland's avatar
David Teigland committed
574
575
576
577
578
	gfs2_trans_end(sdp);

	return 1;
}

579
static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino)
David Teigland's avatar
David Teigland committed
580
{
581
582
	struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
	struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
David Teigland's avatar
David Teigland committed
583
584
	struct gfs2_holder gh;
	struct buffer_head *bh;
585
	struct gfs2_inum_range_host ir;
David Teigland's avatar
David Teigland committed
586
587
588
589
590
591
592
593
594
	int error;

	error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
	if (error)
		return error;

	error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
	if (error)
		goto out;
595
	mutex_lock(&sdp->sd_inum_mutex);
David Teigland's avatar
David Teigland committed
596
597
598
599

	error = gfs2_meta_inode_buffer(ip, &bh);
	if (error)
		goto out_end_trans;
600

David Teigland's avatar
David Teigland committed
601
602
603
604
	gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));

	if (!ir.ir_length) {
		struct buffer_head *m_bh;
605
		u64 x, y;
606
		__be64 z;
David Teigland's avatar
David Teigland committed
607
608
609
610
611

		error = gfs2_meta_inode_buffer(m_ip, &m_bh);
		if (error)
			goto out_brelse;

612
613
		z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode));
		x = y = be64_to_cpu(z);
David Teigland's avatar
David Teigland committed
614
615
616
617
618
		ir.ir_start = x;
		ir.ir_length = GFS2_INUM_QUANTUM;
		x += GFS2_INUM_QUANTUM;
		if (x < y)
			gfs2_consist_inode(m_ip);
619
		z = cpu_to_be64(x);
620
		gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
621
		*(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z;
David Teigland's avatar
David Teigland committed
622
623
624
625
626
627
628

		brelse(m_bh);
	}

	*formal_ino = ir.ir_start++;
	ir.ir_length--;

629
	gfs2_trans_add_bh(ip->i_gl, bh, 1);
David Teigland's avatar
David Teigland committed
630
631
	gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));

632
out_brelse:
David Teigland's avatar
David Teigland committed
633
	brelse(bh);
634
out_end_trans:
635
	mutex_unlock(&sdp->sd_inum_mutex);
David Teigland's avatar
David Teigland committed
636
	gfs2_trans_end(sdp);
637
out:
David Teigland's avatar
David Teigland committed
638
639
640
641
	gfs2_glock_dq_uninit(&gh);
	return error;
}

642
static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum)
David Teigland's avatar
David Teigland committed
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
{
	int error;

	error = pick_formal_ino_1(sdp, inum);
	if (error <= 0)
		return error;

	error = pick_formal_ino_2(sdp, inum);

	return error;
}

/**
 * create_ok - OK to create a new on-disk inode here?
 * @dip:  Directory in which dinode is to be created
 * @name:  Name of new dinode
 * @mode:
 *
 * Returns: errno
 */

664
static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
David Teigland's avatar
David Teigland committed
665
666
667
668
		     unsigned int mode)
{
	int error;

669
	error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
David Teigland's avatar
David Teigland committed
670
671
672
673
	if (error)
		return error;

	/*  Don't create entries in an unlinked directory  */
674
	if (!dip->i_inode.i_nlink)
David Teigland's avatar
David Teigland committed
675
676
		return -EPERM;

677
	error = gfs2_dir_check(&dip->i_inode, name, NULL);
David Teigland's avatar
David Teigland committed
678
679
680
681
682
683
684
685
686
687
	switch (error) {
	case -ENOENT:
		error = 0;
		break;
	case 0:
		return -EEXIST;
	default:
		return error;
	}

688
	if (dip->i_entries == (u32)-1)
David Teigland's avatar
David Teigland committed
689
		return -EFBIG;
690
	if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
David Teigland's avatar
David Teigland committed
691
692
693
694
695
696
697
698
		return -EMLINK;

	return 0;
}

static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
			       unsigned int *uid, unsigned int *gid)
{
699
	if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
700
	    (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
David Teigland's avatar
David Teigland committed
701
702
		if (S_ISDIR(*mode))
			*mode |= S_ISUID;
703
		else if (dip->i_inode.i_uid != current_fsuid())
David Teigland's avatar
David Teigland committed
704
			*mode &= ~07111;
705
		*uid = dip->i_inode.i_uid;
David Teigland's avatar
David Teigland committed
706
	} else
707
		*uid = current_fsuid();
David Teigland's avatar
David Teigland committed
708

709
	if (dip->i_inode.i_mode & S_ISGID) {
David Teigland's avatar
David Teigland committed
710
711
		if (S_ISDIR(*mode))
			*mode |= S_ISGID;
712
		*gid = dip->i_inode.i_gid;
David Teigland's avatar
David Teigland committed
713
	} else
714
		*gid = current_fsgid();
David Teigland's avatar
David Teigland committed
715
716
}

717
static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
David Teigland's avatar
David Teigland committed
718
{
719
	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
David Teigland's avatar
David Teigland committed
720
721
	int error;

722
723
	if (gfs2_alloc_get(dip) == NULL)
		return -ENOMEM;
David Teigland's avatar
David Teigland committed
724

725
	dip->i_alloc->al_requested = RES_DINODE;
David Teigland's avatar
David Teigland committed
726
727
728
729
	error = gfs2_inplace_reserve(dip);
	if (error)
		goto out;

730
	error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
David Teigland's avatar
David Teigland committed
731
732
733
	if (error)
		goto out_ipreserv;

734
	error = gfs2_alloc_di(dip, no_addr, generation);
David Teigland's avatar
David Teigland committed
735
736
737

	gfs2_trans_end(sdp);

738
out_ipreserv:
David Teigland's avatar
David Teigland committed
739
	gfs2_inplace_release(dip);
740
out:
David Teigland's avatar
David Teigland committed
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
	gfs2_alloc_put(dip);
	return error;
}

/**
 * init_dinode - Fill in a new dinode structure
 * @dip: the directory this inode is being created in
 * @gl: The glock covering the new inode
 * @inum: the inode number
 * @mode: the file permissions
 * @uid:
 * @gid:
 *
 */

static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
Al Viro's avatar
Al Viro committed
757
			const struct gfs2_inum_host *inum, unsigned int mode,
758
			unsigned int uid, unsigned int gid,
759
			const u64 *generation, dev_t dev, struct buffer_head **bhp)
David Teigland's avatar
David Teigland committed
760
{
761
	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
762
	struct gfs2_dinode *di;
David Teigland's avatar
David Teigland committed
763
	struct buffer_head *dibh;
764
	struct timespec tv = CURRENT_TIME;
David Teigland's avatar
David Teigland committed
765
766

	dibh = gfs2_meta_new(gl, inum->no_addr);
767
	gfs2_trans_add_bh(gl, dibh, 1);
David Teigland's avatar
David Teigland committed
768
769
	gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
	gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
770
771
	di = (struct gfs2_dinode *)dibh->b_data;

772
773
	di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
	di->di_num.no_addr = cpu_to_be64(inum->no_addr);
774
775
776
	di->di_mode = cpu_to_be32(mode);
	di->di_uid = cpu_to_be32(uid);
	di->di_gid = cpu_to_be32(gid);
777
778
	di->di_nlink = 0;
	di->di_size = 0;
779
	di->di_blocks = cpu_to_be64(1);
780
	di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec);
781
782
	di->di_major = cpu_to_be32(MAJOR(dev));
	di->di_minor = cpu_to_be32(MINOR(dev));
783
	di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
784
	di->di_generation = cpu_to_be64(*generation);
785
	di->di_flags = 0;
David Teigland's avatar
David Teigland committed
786
787

	if (S_ISREG(mode)) {
788
		if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
David Teigland's avatar
David Teigland committed
789
		    gfs2_tune_get(sdp, gt_new_files_jdata))
790
			di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
David Teigland's avatar
David Teigland committed
791
	} else if (S_ISDIR(mode)) {
792
		di->di_flags |= cpu_to_be32(dip->i_diskflags &
793
					    GFS2_DIF_INHERIT_JDATA);
David Teigland's avatar
David Teigland committed
794
795
	}

796
	di->__pad1 = 0;
797
	di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
798
	di->di_height = 0;
799
800
	di->__pad2 = 0;
	di->__pad3 = 0;
801
802
	di->di_depth = 0;
	di->di_entries = 0;
803
	memset(&di->__pad4, 0, sizeof(di->__pad4));
804
	di->di_eattr = 0;
805
806
807
	di->di_atime_nsec = cpu_to_be32(tv.tv_nsec);
	di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec);
	di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec);
808
	memset(&di->di_reserved, 0, sizeof(di->di_reserved));
809
810
	
	set_buffer_uptodate(dibh);
811

812
	*bhp = dibh;
David Teigland's avatar
David Teigland committed
813
814
815
}

static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
Al Viro's avatar
Al Viro committed
816
		       unsigned int mode, const struct gfs2_inum_host *inum,
817
		       const u64 *generation, dev_t dev, struct buffer_head **bhp)
David Teigland's avatar
David Teigland committed
818
{
819
	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
David Teigland's avatar
David Teigland committed
820
821
822
823
	unsigned int uid, gid;
	int error;

	munge_mode_uid_gid(dip, &mode, &uid, &gid);
824
825
	if (!gfs2_alloc_get(dip))
		return -ENOMEM;
David Teigland's avatar
David Teigland committed
826
827
828
829
830
831
832
833
834

	error = gfs2_quota_lock(dip, uid, gid);
	if (error)
		goto out;

	error = gfs2_quota_check(dip, uid, gid);
	if (error)
		goto out_quota;

835
	error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
David Teigland's avatar
David Teigland committed
836
837
838
	if (error)
		goto out_quota;

839
	init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, bhp);
David Teigland's avatar
David Teigland committed
840
841
842
	gfs2_quota_change(dip, +1, uid, gid);
	gfs2_trans_end(sdp);

843
out_quota:
David Teigland's avatar
David Teigland committed
844
	gfs2_quota_unlock(dip);
845
out:
David Teigland's avatar
David Teigland committed
846
847
848
849
	gfs2_alloc_put(dip);
	return error;
}

850
851
static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
		       struct gfs2_inode *ip)
David Teigland's avatar
David Teigland committed
852
{
853
	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
David Teigland's avatar
David Teigland committed
854
855
856
857
858
859
	struct gfs2_alloc *al;
	int alloc_required;
	struct buffer_head *dibh;
	int error;

	al = gfs2_alloc_get(dip);
860
861
	if (!al)
		return -ENOMEM;
David Teigland's avatar
David Teigland committed
862
863
864
865
866

	error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
	if (error)
		goto fail;

867
	error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
868
	if (alloc_required < 0)
Bob Peterson's avatar
Bob Peterson committed
869
		goto fail_quota_locks;
David Teigland's avatar
David Teigland committed
870
	if (alloc_required) {
871
		error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
David Teigland's avatar
David Teigland committed
872
873
874
875
876
877
878
879
880
		if (error)
			goto fail_quota_locks;

		al->al_requested = sdp->sd_max_dirres;

		error = gfs2_inplace_reserve(dip);
		if (error)
			goto fail_quota_locks;

881
		error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
882
					 al->al_rgd->rd_length +
883
					 2 * RES_DINODE +
David Teigland's avatar
David Teigland committed
884
885
886
887
					 RES_STATFS + RES_QUOTA, 0);
		if (error)
			goto fail_ipreserv;
	} else {
888
		error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
David Teigland's avatar
David Teigland committed
889
890
891
892
		if (error)
			goto fail_quota_locks;
	}

893
	error = gfs2_dir_add(&dip->i_inode, name, ip, IF2DT(ip->i_inode.i_mode));
David Teigland's avatar
David Teigland committed
894
895
896
897
898
899
	if (error)
		goto fail_end_trans;

	error = gfs2_meta_inode_buffer(ip, &dibh);
	if (error)
		goto fail_end_trans;
900
	ip->i_inode.i_nlink = 1;
901
	gfs2_trans_add_bh(ip->i_gl, dibh, 1);
902
	gfs2_dinode_out(ip, dibh->b_data);
David Teigland's avatar
David Teigland committed
903
904
905
	brelse(dibh);
	return 0;

906
fail_end_trans:
David Teigland's avatar
David Teigland committed
907
908
	gfs2_trans_end(sdp);

909
fail_ipreserv:
910
	if (dip->i_alloc->al_rgd)
David Teigland's avatar
David Teigland committed
911
912
		gfs2_inplace_release(dip);

913
fail_quota_locks:
David Teigland's avatar
David Teigland committed
914
915
	gfs2_quota_unlock(dip);

916
fail:
David Teigland's avatar
David Teigland committed
917
918
919
920
	gfs2_alloc_put(dip);
	return error;
}

921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip)
{
	int err;
	size_t len;
	void *value;
	char *name;

	err = security_inode_init_security(&ip->i_inode, &dip->i_inode,
					   &name, &value, &len);

	if (err) {
		if (err == -EOPNOTSUPP)
			return 0;
		return err;
	}

937
	err = gfs2_xattr_set(&ip->i_inode, GFS2_EATYPE_SECURITY, name, value, len, 0);
938
939
940
941
942
943
	kfree(value);
	kfree(name);

	return err;
}

David Teigland's avatar
David Teigland committed
944
945
946
947
948
949
950
951
952
/**
 * gfs2_createi - Create a new inode
 * @ghs: An array of two holders
 * @name: The name of the new file
 * @mode: the permissions on the new inode
 *
 * @ghs[0] is an initialized holder for the directory
 * @ghs[1] is the holder for the inode lock
 *
953
 * If the return value is not NULL, the glocks on both the directory and the new
David Teigland's avatar
David Teigland committed
954
955
956
 * file are held.  A transaction has been started and an inplace reservation
 * is held, as well.
 *
957
 * Returns: An inode
David Teigland's avatar
David Teigland committed
958
959
 */

960
struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
961
			   unsigned int mode, dev_t dev)
David Teigland's avatar
David Teigland committed
962
{
963
	struct inode *inode = NULL;
964
	struct gfs2_inode *dip = ghs->gh_gl->gl_object;
965
966
	struct inode *dir = &dip->i_inode;
	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
967
	struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
David Teigland's avatar
David Teigland committed
968
	int error;
969
	u64 generation;
970
	struct buffer_head *bh = NULL;
David Teigland's avatar
David Teigland committed
971
972

	if (!name->len || name->len > GFS2_FNAMESIZE)
973
		return ERR_PTR(-ENAMETOOLONG);
David Teigland's avatar
David Teigland committed
974
975
976
977
978
979
980
981
982
983

	gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
	error = gfs2_glock_nq(ghs);
	if (error)
		goto fail;

	error = create_ok(dip, name, mode);
	if (error)
		goto fail_gunlock;

984
	error = pick_formal_ino(sdp, &inum.no_formal_ino);
David Teigland's avatar
David Teigland committed
985
986
987
	if (error)
		goto fail_gunlock;

988
	error = alloc_dinode(dip, &inum.no_addr, &generation);
David Teigland's avatar
David Teigland committed
989
990
991
	if (error)
		goto fail_gunlock;

992
993
994
995
	error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
				  LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
	if (error)
		goto fail_gunlock;
David Teigland's avatar
David Teigland committed
996

997
	error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, &bh);
David Teigland's avatar
David Teigland committed
998
999
1000
	if (error)
		goto fail_gunlock2;

1001
1002
	inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode),
					inum.no_addr,
1003
					inum.no_formal_ino, 0);
1004
	if (IS_ERR(inode))
David Teigland's avatar
David Teigland committed
1005