1	// SPDX-License-Identifier: GPL-2.0-only
2	/*
3	* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4	* Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
5	*/
6
7	#include <linux/slab.h>
8	#include <linux/spinlock.h>
9	#include <linux/completion.h>
10	#include <linux/buffer_head.h>
11	#include <linux/namei.h>
12	#include <linux/mm.h>
13	#include <linux/cred.h>
14	#include <linux/xattr.h>
15	#include <linux/posix_acl.h>
16	#include <linux/gfs2_ondisk.h>
17	#include <linux/crc32.h>
18	#include <linux/iomap.h>
19	#include <linux/security.h>
20	#include <linux/fiemap.h>
21	#include <linux/uaccess.h>
22
23	#include "gfs2.h"
24	#include "incore.h"
25	#include "acl.h"
26	#include "bmap.h"
27	#include "dir.h"
28	#include "xattr.h"
29	#include "glock.h"
30	#include "inode.h"
31	#include "meta_io.h"
32	#include "quota.h"
33	#include "rgrp.h"
34	#include "trans.h"
35	#include "util.h"
36	#include "super.h"
37	#include "glops.h"
38
39	static const struct inode_operations gfs2_file_iops;
40	static const struct inode_operations gfs2_dir_iops;
41	static const struct inode_operations gfs2_symlink_iops;
42
43	/**
44	* gfs2_set_iop - Sets inode operations
45	* @inode: The inode with correct i_mode filled in
46	*
47	* GFS2 lookup code fills in vfs inode contents based on info obtained
48	* from directory entry inside gfs2_inode_lookup().
49	*/
50
51	static void gfs2_set_iop(struct inode *inode)
52	{
53	struct gfs2_sbd *sdp = GFS2_SB(inode);
54	umode_t mode = inode->i_mode;
55
56	if (S_ISREG(mode)) {
57	inode->i_op = &gfs2_file_iops;
58	if (gfs2_localflocks(sdp))
59	inode->i_fop = &gfs2_file_fops_nolock;
60	else
61	inode->i_fop = &gfs2_file_fops;
62	} else if (S_ISDIR(mode)) {
63	inode->i_op = &gfs2_dir_iops;
64	if (gfs2_localflocks(sdp))
65	inode->i_fop = &gfs2_dir_fops_nolock;
66	else
67	inode->i_fop = &gfs2_dir_fops;
68	} else if (S_ISLNK(mode)) {
69	inode->i_op = &gfs2_symlink_iops;
70	} else {
71	inode->i_op = &gfs2_file_iops;
72	init_special_inode(inode, inode->i_mode, inode->i_rdev);
73	}
74	}
75
76	static int iget_test(struct inode *inode, void *opaque)
77	{
78	u64 no_addr = *(u64 *)opaque;
79
80	return GFS2_I(inode)->i_no_addr == no_addr;
81	}
82
83	static int iget_set(struct inode *inode, void *opaque)
84	{
85	u64 no_addr = *(u64 *)opaque;
86
87	GFS2_I(inode)->i_no_addr = no_addr;
88	inode->i_ino = no_addr;
89	return 0;
90	}
91
92	/**
93	* gfs2_inode_lookup - Lookup an inode
94	* @sb: The super block
95	* @type: The type of the inode
96	* @no_addr: The inode number
97	* @no_formal_ino: The inode generation number
98	* @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
99	* GFS2_BLKST_FREE to indicate not to verify)
100	*
101	* If @type is DT_UNKNOWN, the inode type is fetched from disk.
102	*
103	* If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
104	* placeholder because it doesn't otherwise make sense), the on-disk block type
105	* is verified to be @blktype.
106	*
107	* When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE)
108	* if it detects that @no_formal_ino doesn't match the actual inode generation
109	* number. However, it doesn't always know unless @type is DT_UNKNOWN.
110	*
111	* Returns: A VFS inode, or an error
112	*/
113
114	struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
115	u64 no_addr, u64 no_formal_ino,
116	unsigned int blktype)
117	{
118	struct inode *inode;
119	struct gfs2_inode *ip;
120	struct gfs2_holder i_gh;
121	int error;
122
123	gfs2_holder_mark_uninitialized(gh: &i_gh);
124	inode = iget5_locked(sb, no_addr, test: iget_test, set: iget_set, &no_addr);
125	if (!inode)
126	return ERR_PTR(error: -ENOMEM);
127
128	ip = GFS2_I(inode);
129
130	if (inode->i_state & I_NEW) {
131	struct gfs2_sbd *sdp = GFS2_SB(inode);
132	struct gfs2_glock *io_gl;
133	int extra_flags = 0;
134
135	error = gfs2_glock_get(sdp, number: no_addr, glops: &gfs2_inode_glops, create: CREATE,
136	glp: &ip->i_gl);
137	if (unlikely(error))
138	goto fail;
139
140	error = gfs2_glock_get(sdp, number: no_addr, glops: &gfs2_iopen_glops, create: CREATE,
141	glp: &io_gl);
142	if (unlikely(error))
143	goto fail;
144
145	/*
146	* The only caller that sets @blktype to GFS2_BLKST_UNLINKED is
147	* delete_work_func(). Make sure not to cancel the delete work
148	* from within itself here.
149	*/
150	if (blktype == GFS2_BLKST_UNLINKED)
151	extra_flags |= LM_FLAG_TRY;
152	else
153	gfs2_cancel_delete_work(gl: io_gl);
154	error = gfs2_glock_nq_init(gl: io_gl, LM_ST_SHARED,
155	GL_EXACT | GL_NOPID | extra_flags,
156	gh: &ip->i_iopen_gh);
157	gfs2_glock_put(gl: io_gl);
158	if (unlikely(error))
159	goto fail;
160
161	if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
162	/*
163	* The GL_SKIP flag indicates to skip reading the inode
164	* block. We read the inode when instantiating it
165	* after possibly checking the block type.
166	*/
167	error = gfs2_glock_nq_init(gl: ip->i_gl, LM_ST_EXCLUSIVE,
168	GL_SKIP, gh: &i_gh);
169	if (error)
170	goto fail;
171
172	error = -ESTALE;
173	if (no_formal_ino &&
174	gfs2_inode_already_deleted(gl: ip->i_gl, generation: no_formal_ino))
175	goto fail;
176
177	if (blktype != GFS2_BLKST_FREE) {
178	error = gfs2_check_blk_type(sdp, no_addr,
179	type: blktype);
180	if (error)
181	goto fail;
182	}
183	}
184
185	set_bit(nr: GLF_INSTANTIATE_NEEDED, addr: &ip->i_gl->gl_flags);
186
187	/* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
188	inode_set_atime(inode,
189	sec: 1LL << (8 * sizeof(inode_get_atime_sec(inode)) - 1),
190	nsec: 0);
191
192	glock_set_object(gl: ip->i_gl, object: ip);
193
194	if (type == DT_UNKNOWN) {
195	/* Inode glock must be locked already */
196	error = gfs2_instantiate(gh: &i_gh);
197	if (error) {
198	glock_clear_object(gl: ip->i_gl, object: ip);
199	goto fail;
200	}
201	} else {
202	ip->i_no_formal_ino = no_formal_ino;
203	inode->i_mode = DT2IF(type);
204	}
205
206	if (gfs2_holder_initialized(gh: &i_gh))
207	gfs2_glock_dq_uninit(gh: &i_gh);
208	glock_set_object(gl: ip->i_iopen_gh.gh_gl, object: ip);
209
210	gfs2_set_iop(inode);
211	unlock_new_inode(inode);
212	}
213
214	if (no_formal_ino && ip->i_no_formal_ino &&
215	no_formal_ino != ip->i_no_formal_ino) {
216	iput(inode);
217	return ERR_PTR(error: -ESTALE);
218	}
219
220	return inode;
221
222	fail:
223	if (error == GLR_TRYFAILED)
224	error = -EAGAIN;
225	if (gfs2_holder_initialized(gh: &ip->i_iopen_gh))
226	gfs2_glock_dq_uninit(gh: &ip->i_iopen_gh);
227	if (gfs2_holder_initialized(gh: &i_gh))
228	gfs2_glock_dq_uninit(gh: &i_gh);
229	if (ip->i_gl) {
230	gfs2_glock_put(gl: ip->i_gl);
231	ip->i_gl = NULL;
232	}
233	iget_failed(inode);
234	return ERR_PTR(error);
235	}
236
237	/**
238	* gfs2_lookup_by_inum - look up an inode by inode number
239	* @sdp: The super block
240	* @no_addr: The inode number
241	* @no_formal_ino: The inode generation number (0 for any)
242	* @blktype: Requested block type (see gfs2_inode_lookup)
243	*/
244	struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
245	u64 no_formal_ino, unsigned int blktype)
246	{
247	struct super_block *sb = sdp->sd_vfs;
248	struct inode *inode;
249	int error;
250
251	inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino,
252	blktype);
253	if (IS_ERR(ptr: inode))
254	return inode;
255
256	if (no_formal_ino) {
257	error = -EIO;
258	if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
259	goto fail_iput;
260	}
261	return inode;
262
263	fail_iput:
264	iput(inode);
265	return ERR_PTR(error);
266	}
267
268
269	/**
270	* gfs2_lookup_meta - Look up an inode in a metadata directory
271	* @dip: The directory
272	* @name: The name of the inode
273	*/
274	struct inode *gfs2_lookup_meta(struct inode *dip, const char *name)
275	{
276	struct qstr qstr;
277	struct inode *inode;
278
279	gfs2_str2qstr(name: &qstr, fname: name);
280	inode = gfs2_lookupi(dir: dip, name: &qstr, is_root: 1);
281	if (IS_ERR_OR_NULL(ptr: inode))
282	return inode ? inode : ERR_PTR(error: -ENOENT);
283
284	/*
285	* Must not call back into the filesystem when allocating
286	* pages in the metadata inode's address space.
287	*/
288	mapping_set_gfp_mask(m: inode->i_mapping, GFP_NOFS);
289
290	return inode;
291	}
292
293
294	/**
295	* gfs2_lookupi - Look up a filename in a directory and return its inode
296	* @dir: The inode of the directory containing the inode to look-up
297	* @name: The name of the inode to look for
298	* @is_root: If 1, ignore the caller's permissions
299	*
300	* This can be called via the VFS filldir function when NFS is doing
301	* a readdirplus and the inode which its intending to stat isn't
302	* already in cache. In this case we must not take the directory glock
303	* again, since the readdir call will have already taken that lock.
304	*
305	* Returns: errno
306	*/
307
308	struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
309	int is_root)
310	{
311	struct super_block *sb = dir->i_sb;
312	struct gfs2_inode *dip = GFS2_I(inode: dir);
313	struct gfs2_holder d_gh;
314	int error = 0;
315	struct inode *inode = NULL;
316
317	gfs2_holder_mark_uninitialized(gh: &d_gh);
318	if (!name->len || name->len > GFS2_FNAMESIZE)
319	return ERR_PTR(error: -ENAMETOOLONG);
320
321	if ((name->len == 1 && memcmp(p: name->name, q: ".", size: 1) == 0) ||
322	(name->len == 2 && memcmp(p: name->name, q: "..", size: 2) == 0 &&
323	dir == d_inode(dentry: sb->s_root))) {
324	igrab(dir);
325	return dir;
326	}
327
328	if (gfs2_glock_is_locked_by_me(gl: dip->i_gl) == NULL) {
329	error = gfs2_glock_nq_init(gl: dip->i_gl, LM_ST_SHARED, flags: 0, gh: &d_gh);
330	if (error)
331	return ERR_PTR(error);
332	}
333
334	if (!is_root) {
335	error = gfs2_permission(idmap: &nop_mnt_idmap, inode: dir, MAY_EXEC);
336	if (error)
337	goto out;
338	}
339
340	inode = gfs2_dir_search(dir, filename: name, fail_on_exist: false);
341	if (IS_ERR(ptr: inode))
342	error = PTR_ERR(ptr: inode);
343	out:
344	if (gfs2_holder_initialized(gh: &d_gh))
345	gfs2_glock_dq_uninit(gh: &d_gh);
346	if (error == -ENOENT)
347	return NULL;
348	return inode ? inode : ERR_PTR(error);
349	}
350
351	/**
352	* create_ok - OK to create a new on-disk inode here?
353	* @dip: Directory in which dinode is to be created
354	* @name: Name of new dinode
355	* @mode:
356	*
357	* Returns: errno
358	*/
359
360	static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
361	umode_t mode)
362	{
363	int error;
364
365	error = gfs2_permission(idmap: &nop_mnt_idmap, inode: &dip->i_inode,
366	MAY_WRITE | MAY_EXEC);
367	if (error)
368	return error;
369
370	/* Don't create entries in an unlinked directory */
371	if (!dip->i_inode.i_nlink)
372	return -ENOENT;
373
374	if (dip->i_entries == (u32)-1)
375	return -EFBIG;
376	if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
377	return -EMLINK;
378
379	return 0;
380	}
381
382	static void munge_mode_uid_gid(const struct gfs2_inode *dip,
383	struct inode *inode)
384	{
385	if (GFS2_SB(inode: &dip->i_inode)->sd_args.ar_suiddir &&
386	(dip->i_inode.i_mode & S_ISUID) &&
387	!uid_eq(left: dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
388	if (S_ISDIR(inode->i_mode))
389	inode->i_mode |= S_ISUID;
390	else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
391	inode->i_mode &= ~07111;
392	inode->i_uid = dip->i_inode.i_uid;
393	} else
394	inode->i_uid = current_fsuid();
395
396	if (dip->i_inode.i_mode & S_ISGID) {
397	if (S_ISDIR(inode->i_mode))
398	inode->i_mode |= S_ISGID;
399	inode->i_gid = dip->i_inode.i_gid;
400	} else
401	inode->i_gid = current_fsgid();
402	}
403
404	static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
405	{
406	struct gfs2_sbd *sdp = GFS2_SB(inode: &ip->i_inode);
407	struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
408	int error;
409
410	error = gfs2_quota_lock_check(ip, ap: &ap);
411	if (error)
412	goto out;
413
414	error = gfs2_inplace_reserve(ip, ap: &ap);
415	if (error)
416	goto out_quota;
417
418	error = gfs2_trans_begin(sdp, blocks: (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, revokes: 0);
419	if (error)
420	goto out_ipreserv;
421
422	error = gfs2_alloc_blocks(ip, bn: &ip->i_no_addr, n: dblocks, dinode: 1);
423	if (error)
424	goto out_trans_end;
425
426	ip->i_no_formal_ino = ip->i_generation;
427	ip->i_inode.i_ino = ip->i_no_addr;
428	ip->i_goal = ip->i_no_addr;
429	if (*dblocks > 1)
430	ip->i_eattr = ip->i_no_addr + 1;
431
432	out_trans_end:
433	gfs2_trans_end(sdp);
434	out_ipreserv:
435	gfs2_inplace_release(ip);
436	out_quota:
437	gfs2_quota_unlock(ip);
438	out:
439	return error;
440	}
441
442	static void gfs2_init_dir(struct buffer_head *dibh,
443	const struct gfs2_inode *parent)
444	{
445	struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
446	struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
447
448	gfs2_qstr2dirent(name: &gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
449	dent->de_inum = di->di_num; /* already GFS2 endian */
450	dent->de_type = cpu_to_be16(DT_DIR);
451
452	dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
453	gfs2_qstr2dirent(name: &gfs2_qdotdot, reclen: dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
454	gfs2_inum_out(ip: parent, dent);
455	dent->de_type = cpu_to_be16(DT_DIR);
456
457	}
458
459	/**
460	* gfs2_init_xattr - Initialise an xattr block for a new inode
461	* @ip: The inode in question
462	*
463	* This sets up an empty xattr block for a new inode, ready to
464	* take any ACLs, LSM xattrs, etc.
465	*/
466
467	static void gfs2_init_xattr(struct gfs2_inode *ip)
468	{
469	struct gfs2_sbd *sdp = GFS2_SB(inode: &ip->i_inode);
470	struct buffer_head *bh;
471	struct gfs2_ea_header *ea;
472
473	bh = gfs2_meta_new(gl: ip->i_gl, blkno: ip->i_eattr);
474	gfs2_trans_add_meta(gl: ip->i_gl, bh);
475	gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
476	gfs2_buffer_clear_tail(bh, head: sizeof(struct gfs2_meta_header));
477
478	ea = GFS2_EA_BH2FIRST(bh);
479	ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
480	ea->ea_type = GFS2_EATYPE_UNUSED;
481	ea->ea_flags = GFS2_EAFLAG_LAST;
482
483	brelse(bh);
484	}
485
486	/**
487	* init_dinode - Fill in a new dinode structure
488	* @dip: The directory this inode is being created in
489	* @ip: The inode
490	* @symname: The symlink destination (if a symlink)
491	*
492	*/
493
494	static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
495	const char *symname)
496	{
497	struct gfs2_dinode *di;
498	struct buffer_head *dibh;
499
500	dibh = gfs2_meta_new(gl: ip->i_gl, blkno: ip->i_no_addr);
501	gfs2_trans_add_meta(gl: ip->i_gl, bh: dibh);
502	di = (struct gfs2_dinode *)dibh->b_data;
503	gfs2_dinode_out(ip, buf: di);
504
505	di->di_major = cpu_to_be32(imajor(&ip->i_inode));
506	di->di_minor = cpu_to_be32(iminor(&ip->i_inode));
507	di->__pad1 = 0;
508	di->__pad2 = 0;
509	di->__pad3 = 0;
510	memset(&di->__pad4, 0, sizeof(di->__pad4));
511	memset(&di->di_reserved, 0, sizeof(di->di_reserved));
512	gfs2_buffer_clear_tail(bh: dibh, head: sizeof(struct gfs2_dinode));
513
514	switch(ip->i_inode.i_mode & S_IFMT) {
515	case S_IFDIR:
516	gfs2_init_dir(dibh, parent: dip);
517	break;
518	case S_IFLNK:
519	memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
520	break;
521	}
522
523	set_buffer_uptodate(dibh);
524	brelse(bh: dibh);
525	}
526
527	/**
528	* gfs2_trans_da_blks - Calculate number of blocks to link inode
529	* @dip: The directory we are linking into
530	* @da: The dir add information
531	* @nr_inodes: The number of inodes involved
532	*
533	* This calculate the number of blocks we need to reserve in a
534	* transaction to link @nr_inodes into a directory. In most cases
535	* @nr_inodes will be 2 (the directory plus the inode being linked in)
536	* but in case of rename, 4 may be required.
537	*
538	* Returns: Number of blocks
539	*/
540
541	static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
542	const struct gfs2_diradd *da,
543	unsigned nr_inodes)
544	{
545	return da->nr_blocks + gfs2_rg_blocks(ip: dip, requested: da->nr_blocks) +
546	(nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
547	}
548
549	static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
550	struct gfs2_inode *ip, struct gfs2_diradd *da)
551	{
552	struct gfs2_sbd *sdp = GFS2_SB(inode: &dip->i_inode);
553	struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
554	int error;
555
556	if (da->nr_blocks) {
557	error = gfs2_quota_lock_check(ip: dip, ap: &ap);
558	if (error)
559	goto fail_quota_locks;
560
561	error = gfs2_inplace_reserve(ip: dip, ap: &ap);
562	if (error)
563	goto fail_quota_locks;
564
565	error = gfs2_trans_begin(sdp, blocks: gfs2_trans_da_blks(dip, da, nr_inodes: 2), revokes: 0);
566	if (error)
567	goto fail_ipreserv;
568	} else {
569	error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, revokes: 0);
570	if (error)
571	goto fail_quota_locks;
572	}
573
574	error = gfs2_dir_add(inode: &dip->i_inode, filename: name, ip, da);
575
576	gfs2_trans_end(sdp);
577	fail_ipreserv:
578	gfs2_inplace_release(ip: dip);
579	fail_quota_locks:
580	gfs2_quota_unlock(ip: dip);
581	return error;
582	}
583
584	static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
585	void *fs_info)
586	{
587	const struct xattr *xattr;
588	int err = 0;
589
590	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
591	err = __gfs2_xattr_set(inode, name: xattr->name, value: xattr->value,
592	size: xattr->value_len, flags: 0,
593	GFS2_EATYPE_SECURITY);
594	if (err < 0)
595	break;
596	}
597	return err;
598	}
599
600	/**
601	* gfs2_create_inode - Create a new inode
602	* @dir: The parent directory
603	* @dentry: The new dentry
604	* @file: If non-NULL, the file which is being opened
605	* @mode: The permissions on the new inode
606	* @dev: For device nodes, this is the device number
607	* @symname: For symlinks, this is the link destination
608	* @size: The initial size of the inode (ignored for directories)
609	* @excl: Force fail if inode exists
610	*
611	* FIXME: Change to allocate the disk blocks and write them out in the same
612	* transaction. That way, we can no longer end up in a situation in which an
613	* inode is allocated, the node crashes, and the block looks like a valid
614	* inode. (With atomic creates in place, we will also no longer need to zero
615	* the link count and dirty the inode here on failure.)
616	*
617	* Returns: 0 on success, or error code
618	*/
619
620	static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
621	struct file *file,
622	umode_t mode, dev_t dev, const char *symname,
623	unsigned int size, int excl)
624	{
625	const struct qstr *name = &dentry->d_name;
626	struct posix_acl *default_acl, *acl;
627	struct gfs2_holder d_gh, gh;
628	struct inode *inode = NULL;
629	struct gfs2_inode *dip = GFS2_I(inode: dir), *ip;
630	struct gfs2_sbd *sdp = GFS2_SB(inode: &dip->i_inode);
631	struct gfs2_glock *io_gl;
632	int error;
633	u32 aflags = 0;
634	unsigned blocks = 1;
635	struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
636
637	if (!name->len || name->len > GFS2_FNAMESIZE)
638	return -ENAMETOOLONG;
639
640	error = gfs2_qa_get(ip: dip);
641	if (error)
642	return error;
643
644	error = gfs2_rindex_update(sdp);
645	if (error)
646	goto fail;
647
648	error = gfs2_glock_nq_init(gl: dip->i_gl, LM_ST_EXCLUSIVE, flags: 0, gh: &d_gh);
649	if (error)
650	goto fail;
651	gfs2_holder_mark_uninitialized(gh: &gh);
652
653	error = create_ok(dip, name, mode);
654	if (error)
655	goto fail_gunlock;
656
657	inode = gfs2_dir_search(dir, filename: &dentry->d_name, fail_on_exist: !S_ISREG(mode) || excl);
658	error = PTR_ERR(ptr: inode);
659	if (!IS_ERR(ptr: inode)) {
660	if (S_ISDIR(inode->i_mode)) {
661	iput(inode);
662	inode = ERR_PTR(error: -EISDIR);
663	goto fail_gunlock;
664	}
665	d_instantiate(dentry, inode);
666	error = 0;
667	if (file) {
668	if (S_ISREG(inode->i_mode))
669	error = finish_open(file, dentry, open: gfs2_open_common);
670	else
671	error = finish_no_open(file, NULL);
672	}
673	gfs2_glock_dq_uninit(gh: &d_gh);
674	goto fail;
675	} else if (error != -ENOENT) {
676	goto fail_gunlock;
677	}
678
679	error = gfs2_diradd_alloc_required(dir, filename: name, da: &da);
680	if (error < 0)
681	goto fail_gunlock;
682
683	inode = new_inode(sb: sdp->sd_vfs);
684	error = -ENOMEM;
685	if (!inode)
686	goto fail_gunlock;
687	ip = GFS2_I(inode);
688
689	error = posix_acl_create(dir, &mode, &default_acl, &acl);
690	if (error)
691	goto fail_gunlock;
692
693	error = gfs2_qa_get(ip);
694	if (error)
695	goto fail_free_acls;
696
697	inode->i_mode = mode;
698	set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
699	inode->i_rdev = dev;
700	inode->i_size = size;
701	simple_inode_init_ts(inode);
702	munge_mode_uid_gid(dip, inode);
703	check_and_update_goal(ip: dip);
704	ip->i_goal = dip->i_goal;
705	ip->i_diskflags = 0;
706	ip->i_eattr = 0;
707	ip->i_height = 0;
708	ip->i_depth = 0;
709	ip->i_entries = 0;
710	ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
711
712	switch(mode & S_IFMT) {
713	case S_IFREG:
714	if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
715	gfs2_tune_get(sdp, gt_new_files_jdata))
716	ip->i_diskflags |= GFS2_DIF_JDATA;
717	gfs2_set_aops(inode);
718	break;
719	case S_IFDIR:
720	ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
721	ip->i_diskflags |= GFS2_DIF_JDATA;
722	ip->i_entries = 2;
723	break;
724	}
725
726	/* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
727	if (dip->i_diskflags & GFS2_DIF_SYSTEM)
728	ip->i_diskflags |= GFS2_DIF_SYSTEM;
729
730	gfs2_set_inode_flags(inode);
731
732	if ((GFS2_I(inode: d_inode(dentry: sdp->sd_root_dir)) == dip) ||
733	(dip->i_diskflags & GFS2_DIF_TOPDIR))
734	aflags |= GFS2_AF_ORLOV;
735
736	if (default_acl || acl)
737	blocks++;
738
739	error = alloc_dinode(ip, flags: aflags, dblocks: &blocks);
740	if (error)
741	goto fail_free_inode;
742
743	gfs2_set_inode_blocks(inode, blocks);
744
745	error = gfs2_glock_get(sdp, number: ip->i_no_addr, glops: &gfs2_inode_glops, create: CREATE, glp: &ip->i_gl);
746	if (error)
747	goto fail_free_inode;
748
749	error = gfs2_glock_get(sdp, number: ip->i_no_addr, glops: &gfs2_iopen_glops, create: CREATE, glp: &io_gl);
750	if (error)
751	goto fail_free_inode;
752	gfs2_cancel_delete_work(gl: io_gl);
753
754	retry:
755	error = insert_inode_locked4(inode, ip->i_no_addr, test: iget_test, &ip->i_no_addr);
756	if (error == -EBUSY)
757	goto retry;
758	if (error)
759	goto fail_gunlock2;
760
761	error = gfs2_glock_nq_init(gl: io_gl, LM_ST_SHARED, GL_EXACT | GL_NOPID,
762	gh: &ip->i_iopen_gh);
763	if (error)
764	goto fail_gunlock2;
765
766	error = gfs2_glock_nq_init(gl: ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, gh: &gh);
767	if (error)
768	goto fail_gunlock3;
769
770	error = gfs2_trans_begin(sdp, blocks, revokes: 0);
771	if (error)
772	goto fail_gunlock3;
773
774	if (blocks > 1)
775	gfs2_init_xattr(ip);
776	init_dinode(dip, ip, symname);
777	gfs2_trans_end(sdp);
778
779	glock_set_object(gl: ip->i_gl, object: ip);
780	glock_set_object(gl: io_gl, object: ip);
781	gfs2_set_iop(inode);
782
783	if (default_acl) {
784	error = __gfs2_set_acl(inode, acl: default_acl, ACL_TYPE_DEFAULT);
785	if (error)
786	goto fail_gunlock4;
787	posix_acl_release(acl: default_acl);
788	default_acl = NULL;
789	}
790	if (acl) {
791	error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
792	if (error)
793	goto fail_gunlock4;
794	posix_acl_release(acl);
795	acl = NULL;
796	}
797
798	error = security_inode_init_security(inode: &ip->i_inode, dir: &dip->i_inode, qstr: name,
799	initxattrs: &gfs2_initxattrs, NULL);
800	if (error)
801	goto fail_gunlock4;
802
803	error = link_dinode(dip, name, ip, da: &da);
804	if (error)
805	goto fail_gunlock4;
806
807	mark_inode_dirty(inode);
808	d_instantiate(dentry, inode);
809	/* After instantiate, errors should result in evict which will destroy
810	* both inode and iopen glocks properly. */
811	if (file) {
812	file->f_mode |= FMODE_CREATED;
813	error = finish_open(file, dentry, open: gfs2_open_common);
814	}
815	gfs2_glock_dq_uninit(gh: &d_gh);
816	gfs2_qa_put(ip);
817	gfs2_glock_dq_uninit(gh: &gh);
818	gfs2_glock_put(gl: io_gl);
819	gfs2_qa_put(ip: dip);
820	unlock_new_inode(inode);
821	return error;
822
823	fail_gunlock4:
824	glock_clear_object(gl: ip->i_gl, object: ip);
825	glock_clear_object(gl: io_gl, object: ip);
826	fail_gunlock3:
827	gfs2_glock_dq_uninit(gh: &ip->i_iopen_gh);
828	fail_gunlock2:
829	gfs2_glock_put(gl: io_gl);
830	fail_free_inode:
831	if (ip->i_gl) {
832	gfs2_glock_put(gl: ip->i_gl);
833	ip->i_gl = NULL;
834	}
835	gfs2_rs_deltree(rs: &ip->i_res);
836	gfs2_qa_put(ip);
837	fail_free_acls:
838	posix_acl_release(acl: default_acl);
839	posix_acl_release(acl);
840	fail_gunlock:
841	gfs2_dir_no_add(da: &da);
842	gfs2_glock_dq_uninit(gh: &d_gh);
843	if (!IS_ERR_OR_NULL(ptr: inode)) {
844	set_bit(nr: GIF_ALLOC_FAILED, addr: &ip->i_flags);
845	clear_nlink(inode);
846	if (ip->i_no_addr)
847	mark_inode_dirty(inode);
848	if (inode->i_state & I_NEW)
849	iget_failed(inode);
850	else
851	iput(inode);
852	}
853	if (gfs2_holder_initialized(gh: &gh))
854	gfs2_glock_dq_uninit(gh: &gh);
855	fail:
856	gfs2_qa_put(ip: dip);
857	return error;
858	}
859
860	/**
861	* gfs2_create - Create a file
862	* @idmap: idmap of the mount the inode was found from
863	* @dir: The directory in which to create the file
864	* @dentry: The dentry of the new file
865	* @mode: The mode of the new file
866	* @excl: Force fail if inode exists
867	*
868	* Returns: errno
869	*/
870
871	static int gfs2_create(struct mnt_idmap *idmap, struct inode *dir,
872	struct dentry *dentry, umode_t mode, bool excl)
873	{
874	return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, dev: 0, NULL, size: 0, excl);
875	}
876
877	/**
878	* __gfs2_lookup - Look up a filename in a directory and return its inode
879	* @dir: The directory inode
880	* @dentry: The dentry of the new inode
881	* @file: File to be opened
882	*
883	*
884	* Returns: errno
885	*/
886
887	static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
888	struct file *file)
889	{
890	struct inode *inode;
891	struct dentry *d;
892	struct gfs2_holder gh;
893	struct gfs2_glock *gl;
894	int error;
895
896	inode = gfs2_lookupi(dir, name: &dentry->d_name, is_root: 0);
897	if (inode == NULL) {
898	d_add(dentry, NULL);
899	return NULL;
900	}
901	if (IS_ERR(ptr: inode))
902	return ERR_CAST(ptr: inode);
903
904	gl = GFS2_I(inode)->i_gl;
905	error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, gh: &gh);
906	if (error) {
907	iput(inode);
908	return ERR_PTR(error);
909	}
910
911	d = d_splice_alias(inode, dentry);
912	if (IS_ERR(ptr: d)) {
913	gfs2_glock_dq_uninit(gh: &gh);
914	return d;
915	}
916	if (file && S_ISREG(inode->i_mode))
917	error = finish_open(file, dentry, open: gfs2_open_common);
918
919	gfs2_glock_dq_uninit(gh: &gh);
920	if (error) {
921	dput(d);
922	return ERR_PTR(error);
923	}
924	return d;
925	}
926
927	static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
928	unsigned flags)
929	{
930	return __gfs2_lookup(dir, dentry, NULL);
931	}
932
933	/**
934	* gfs2_link - Link to a file
935	* @old_dentry: The inode to link
936	* @dir: Add link to this directory
937	* @dentry: The name of the link
938	*
939	* Link the inode in "old_dentry" into the directory "dir" with the
940	* name in "dentry".
941	*
942	* Returns: errno
943	*/
944
945	static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
946	struct dentry *dentry)
947	{
948	struct gfs2_inode *dip = GFS2_I(inode: dir);
949	struct gfs2_sbd *sdp = GFS2_SB(inode: dir);
950	struct inode *inode = d_inode(dentry: old_dentry);
951	struct gfs2_inode *ip = GFS2_I(inode);
952	struct gfs2_holder d_gh, gh;
953	struct buffer_head *dibh;
954	struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
955	int error;
956
957	if (S_ISDIR(inode->i_mode))
958	return -EPERM;
959
960	error = gfs2_qa_get(ip: dip);
961	if (error)
962	return error;
963
964	gfs2_holder_init(gl: dip->i_gl, LM_ST_EXCLUSIVE, flags: 0, gh: &d_gh);
965	gfs2_holder_init(gl: ip->i_gl, LM_ST_EXCLUSIVE, flags: 0, gh: &gh);
966
967	error = gfs2_glock_nq(gh: &d_gh);
968	if (error)
969	goto out_parent;
970
971	error = gfs2_glock_nq(gh: &gh);
972	if (error)
973	goto out_child;
974
975	error = -ENOENT;
976	if (inode->i_nlink == 0)
977	goto out_gunlock;
978
979	error = gfs2_permission(idmap: &nop_mnt_idmap, inode: dir, MAY_WRITE | MAY_EXEC);
980	if (error)
981	goto out_gunlock;
982
983	error = gfs2_dir_check(dir, filename: &dentry->d_name, NULL);
984	switch (error) {
985	case -ENOENT:
986	break;
987	case 0:
988	error = -EEXIST;
989	goto out_gunlock;
990	default:
991	goto out_gunlock;
992	}
993
994	error = -EINVAL;
995	if (!dip->i_inode.i_nlink)
996	goto out_gunlock;
997	error = -EFBIG;
998	if (dip->i_entries == (u32)-1)
999	goto out_gunlock;
1000	error = -EPERM;
1001	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1002	goto out_gunlock;
1003	error = -EMLINK;
1004	if (ip->i_inode.i_nlink == (u32)-1)
1005	goto out_gunlock;
1006
1007	error = gfs2_diradd_alloc_required(dir, filename: &dentry->d_name, da: &da);
1008	if (error < 0)
1009	goto out_gunlock;
1010
1011	if (da.nr_blocks) {
1012	struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1013	error = gfs2_quota_lock_check(ip: dip, ap: &ap);
1014	if (error)
1015	goto out_gunlock;
1016
1017	error = gfs2_inplace_reserve(ip: dip, ap: &ap);
1018	if (error)
1019	goto out_gunlock_q;
1020
1021	error = gfs2_trans_begin(sdp, blocks: gfs2_trans_da_blks(dip, da: &da, nr_inodes: 2), revokes: 0);
1022	if (error)
1023	goto out_ipres;
1024	} else {
1025	error = gfs2_trans_begin(sdp, blocks: 2 * RES_DINODE + RES_LEAF, revokes: 0);
1026	if (error)
1027	goto out_ipres;
1028	}
1029
1030	error = gfs2_meta_inode_buffer(ip, bhp: &dibh);
1031	if (error)
1032	goto out_end_trans;
1033
1034	error = gfs2_dir_add(inode: dir, filename: &dentry->d_name, ip, da: &da);
1035	if (error)
1036	goto out_brelse;
1037
1038	gfs2_trans_add_meta(gl: ip->i_gl, bh: dibh);
1039	inc_nlink(inode: &ip->i_inode);
1040	inode_set_ctime_current(inode: &ip->i_inode);
1041	ihold(inode);
1042	d_instantiate(dentry, inode);
1043	mark_inode_dirty(inode);
1044
1045	out_brelse:
1046	brelse(bh: dibh);
1047	out_end_trans:
1048	gfs2_trans_end(sdp);
1049	out_ipres:
1050	if (da.nr_blocks)
1051	gfs2_inplace_release(ip: dip);
1052	out_gunlock_q:
1053	if (da.nr_blocks)
1054	gfs2_quota_unlock(ip: dip);
1055	out_gunlock:
1056	gfs2_dir_no_add(da: &da);
1057	gfs2_glock_dq(gh: &gh);
1058	out_child:
1059	gfs2_glock_dq(gh: &d_gh);
1060	out_parent:
1061	gfs2_qa_put(ip: dip);
1062	gfs2_holder_uninit(gh: &d_gh);
1063	gfs2_holder_uninit(gh: &gh);
1064	return error;
1065	}
1066
1067	/*
1068	* gfs2_unlink_ok - check to see that a inode is still in a directory
1069	* @dip: the directory
1070	* @name: the name of the file
1071	* @ip: the inode
1072	*
1073	* Assumes that the lock on (at least) @dip is held.
1074	*
1075	* Returns: 0 if the parent/child relationship is correct, errno if it isn't
1076	*/
1077
1078	static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1079	const struct gfs2_inode *ip)
1080	{
1081	int error;
1082
1083	if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1084	return -EPERM;
1085
1086	if ((dip->i_inode.i_mode & S_ISVTX) &&
1087	!uid_eq(left: dip->i_inode.i_uid, current_fsuid()) &&
1088	!uid_eq(left: ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1089	return -EPERM;
1090
1091	if (IS_APPEND(&dip->i_inode))
1092	return -EPERM;
1093
1094	error = gfs2_permission(idmap: &nop_mnt_idmap, inode: &dip->i_inode,
1095	MAY_WRITE | MAY_EXEC);
1096	if (error)
1097	return error;
1098
1099	return gfs2_dir_check(dir: &dip->i_inode, filename: name, ip);
1100	}
1101
1102	/**
1103	* gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1104	* @dip: The parent directory
1105	* @dentry: The dentry to unlink
1106	*
1107	* Called with all the locks and in a transaction. This will only be
1108	* called for a directory after it has been checked to ensure it is empty.
1109	*
1110	* Returns: 0 on success, or an error
1111	*/
1112
1113	static int gfs2_unlink_inode(struct gfs2_inode *dip,
1114	const struct dentry *dentry)
1115	{
1116	struct inode *inode = d_inode(dentry);
1117	struct gfs2_inode *ip = GFS2_I(inode);
1118	int error;
1119
1120	error = gfs2_dir_del(dip, dentry);
1121	if (error)
1122	return error;
1123
1124	ip->i_entries = 0;
1125	inode_set_ctime_current(inode);
1126	if (S_ISDIR(inode->i_mode))
1127	clear_nlink(inode);
1128	else
1129	drop_nlink(inode);
1130	mark_inode_dirty(inode);
1131	if (inode->i_nlink == 0)
1132	gfs2_unlink_di(inode);
1133	return 0;
1134	}
1135
1136
1137	/**
1138	* gfs2_unlink - Unlink an inode (this does rmdir as well)
1139	* @dir: The inode of the directory containing the inode to unlink
1140	* @dentry: The file itself
1141	*
1142	* This routine uses the type of the inode as a flag to figure out
1143	* whether this is an unlink or an rmdir.
1144	*
1145	* Returns: errno
1146	*/
1147
1148	static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1149	{
1150	struct gfs2_inode *dip = GFS2_I(inode: dir);
1151	struct gfs2_sbd *sdp = GFS2_SB(inode: dir);
1152	struct inode *inode = d_inode(dentry);
1153	struct gfs2_inode *ip = GFS2_I(inode);
1154	struct gfs2_holder d_gh, r_gh, gh;
1155	struct gfs2_rgrpd *rgd;
1156	int error;
1157
1158	error = gfs2_rindex_update(sdp);
1159	if (error)
1160	return error;
1161
1162	error = -EROFS;
1163
1164	gfs2_holder_init(gl: dip->i_gl, LM_ST_EXCLUSIVE, flags: 0, gh: &d_gh);
1165	gfs2_holder_init(gl: ip->i_gl, LM_ST_EXCLUSIVE, flags: 0, gh: &gh);
1166
1167	rgd = gfs2_blk2rgrpd(sdp, blk: ip->i_no_addr, exact: 1);
1168	if (!rgd)
1169	goto out_inodes;
1170
1171	gfs2_holder_init(gl: rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, gh: &r_gh);
1172
1173
1174	error = gfs2_glock_nq(gh: &d_gh);
1175	if (error)
1176	goto out_parent;
1177
1178	error = gfs2_glock_nq(gh: &gh);
1179	if (error)
1180	goto out_child;
1181
1182	error = -ENOENT;
1183	if (inode->i_nlink == 0)
1184	goto out_rgrp;
1185
1186	if (S_ISDIR(inode->i_mode)) {
1187	error = -ENOTEMPTY;
1188	if (ip->i_entries > 2 || inode->i_nlink > 2)
1189	goto out_rgrp;
1190	}
1191
1192	error = gfs2_glock_nq(gh: &r_gh); /* rgrp */
1193	if (error)
1194	goto out_rgrp;
1195
1196	error = gfs2_unlink_ok(dip, name: &dentry->d_name, ip);
1197	if (error)
1198	goto out_gunlock;
1199
1200	error = gfs2_trans_begin(sdp, blocks: 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, revokes: 0);
1201	if (error)
1202	goto out_gunlock;
1203
1204	error = gfs2_unlink_inode(dip, dentry);
1205	gfs2_trans_end(sdp);
1206
1207	out_gunlock:
1208	gfs2_glock_dq(gh: &r_gh);
1209	out_rgrp:
1210	gfs2_glock_dq(gh: &gh);
1211	out_child:
1212	gfs2_glock_dq(gh: &d_gh);
1213	out_parent:
1214	gfs2_holder_uninit(gh: &r_gh);
1215	out_inodes:
1216	gfs2_holder_uninit(gh: &gh);
1217	gfs2_holder_uninit(gh: &d_gh);
1218	return error;
1219	}
1220
1221	/**
1222	* gfs2_symlink - Create a symlink
1223	* @idmap: idmap of the mount the inode was found from
1224	* @dir: The directory to create the symlink in
1225	* @dentry: The dentry to put the symlink in
1226	* @symname: The thing which the link points to
1227	*
1228	* Returns: errno
1229	*/
1230
1231	static int gfs2_symlink(struct mnt_idmap *idmap, struct inode *dir,
1232	struct dentry *dentry, const char *symname)
1233	{
1234	unsigned int size;
1235
1236	size = strlen(symname);
1237	if (size >= gfs2_max_stuffed_size(ip: GFS2_I(inode: dir)))
1238	return -ENAMETOOLONG;
1239
1240	return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, dev: 0, symname, size, excl: 0);
1241	}
1242
1243	/**
1244	* gfs2_mkdir - Make a directory
1245	* @idmap: idmap of the mount the inode was found from
1246	* @dir: The parent directory of the new one
1247	* @dentry: The dentry of the new directory
1248	* @mode: The mode of the new directory
1249	*
1250	* Returns: errno
1251	*/
1252
1253	static int gfs2_mkdir(struct mnt_idmap *idmap, struct inode *dir,
1254	struct dentry *dentry, umode_t mode)
1255	{
1256	unsigned dsize = gfs2_max_stuffed_size(ip: GFS2_I(inode: dir));
1257	return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, dev: 0, NULL, size: dsize, excl: 0);
1258	}
1259
1260	/**
1261	* gfs2_mknod - Make a special file
1262	* @idmap: idmap of the mount the inode was found from
1263	* @dir: The directory in which the special file will reside
1264	* @dentry: The dentry of the special file
1265	* @mode: The mode of the special file
1266	* @dev: The device specification of the special file
1267	*
1268	*/
1269
1270	static int gfs2_mknod(struct mnt_idmap *idmap, struct inode *dir,
1271	struct dentry *dentry, umode_t mode, dev_t dev)
1272	{
1273	return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, size: 0, excl: 0);
1274	}
1275
1276	/**
1277	* gfs2_atomic_open - Atomically open a file
1278	* @dir: The directory
1279	* @dentry: The proposed new entry
1280	* @file: The proposed new struct file
1281	* @flags: open flags
1282	* @mode: File mode
1283	*
1284	* Returns: error code or 0 for success
1285	*/
1286
1287	static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1288	struct file *file, unsigned flags,
1289	umode_t mode)
1290	{
1291	struct dentry *d;
1292	bool excl = !!(flags & O_EXCL);
1293
1294	if (!d_in_lookup(dentry))
1295	goto skip_lookup;
1296
1297	d = __gfs2_lookup(dir, dentry, file);
1298	if (IS_ERR(ptr: d))
1299	return PTR_ERR(ptr: d);
1300	if (d != NULL)
1301	dentry = d;
1302	if (d_really_is_positive(dentry)) {
1303	if (!(file->f_mode & FMODE_OPENED))
1304	return finish_no_open(file, dentry: d);
1305	dput(d);
1306	return excl && (flags & O_CREAT) ? -EEXIST : 0;
1307	}
1308
1309	BUG_ON(d != NULL);
1310
1311	skip_lookup:
1312	if (!(flags & O_CREAT))
1313	return -ENOENT;
1314
1315	return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, dev: 0, NULL, size: 0, excl);
1316	}
1317
1318	/*
1319	* gfs2_ok_to_move - check if it's ok to move a directory to another directory
1320	* @this: move this
1321	* @to: to here
1322	*
1323	* Follow @to back to the root and make sure we don't encounter @this
1324	* Assumes we already hold the rename lock.
1325	*
1326	* Returns: errno
1327	*/
1328
1329	static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1330	{
1331	struct inode *dir = &to->i_inode;
1332	struct super_block *sb = dir->i_sb;
1333	struct inode *tmp;
1334	int error = 0;
1335
1336	igrab(dir);
1337
1338	for (;;) {
1339	if (dir == &this->i_inode) {
1340	error = -EINVAL;
1341	break;
1342	}
1343	if (dir == d_inode(dentry: sb->s_root)) {
1344	error = 0;
1345	break;
1346	}
1347
1348	tmp = gfs2_lookupi(dir, name: &gfs2_qdotdot, is_root: 1);
1349	if (!tmp) {
1350	error = -ENOENT;
1351	break;
1352	}
1353	if (IS_ERR(ptr: tmp)) {
1354	error = PTR_ERR(ptr: tmp);
1355	break;
1356	}
1357
1358	iput(dir);
1359	dir = tmp;
1360	}
1361
1362	iput(dir);
1363
1364	return error;
1365	}
1366
1367	/**
1368	* update_moved_ino - Update an inode that's being moved
1369	* @ip: The inode being moved
1370	* @ndip: The parent directory of the new filename
1371	* @dir_rename: True of ip is a directory
1372	*
1373	* Returns: errno
1374	*/
1375
1376	static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1377	int dir_rename)
1378	{
1379	if (dir_rename)
1380	return gfs2_dir_mvino(dip: ip, filename: &gfs2_qdotdot, nip: ndip, DT_DIR);
1381
1382	inode_set_ctime_current(inode: &ip->i_inode);
1383	mark_inode_dirty_sync(inode: &ip->i_inode);
1384	return 0;
1385	}
1386
1387
1388	/**
1389	* gfs2_rename - Rename a file
1390	* @odir: Parent directory of old file name
1391	* @odentry: The old dentry of the file
1392	* @ndir: Parent directory of new file name
1393	* @ndentry: The new dentry of the file
1394	*
1395	* Returns: errno
1396	*/
1397
1398	static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1399	struct inode *ndir, struct dentry *ndentry)
1400	{
1401	struct gfs2_inode *odip = GFS2_I(inode: odir);
1402	struct gfs2_inode *ndip = GFS2_I(inode: ndir);
1403	struct gfs2_inode *ip = GFS2_I(inode: d_inode(dentry: odentry));
1404	struct gfs2_inode *nip = NULL;
1405	struct gfs2_sbd *sdp = GFS2_SB(inode: odir);
1406	struct gfs2_holder ghs[4], r_gh, rd_gh;
1407	struct gfs2_rgrpd *nrgd;
1408	unsigned int num_gh;
1409	int dir_rename = 0;
1410	struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1411	unsigned int x;
1412	int error;
1413
1414	gfs2_holder_mark_uninitialized(gh: &r_gh);
1415	gfs2_holder_mark_uninitialized(gh: &rd_gh);
1416	if (d_really_is_positive(dentry: ndentry)) {
1417	nip = GFS2_I(inode: d_inode(dentry: ndentry));
1418	if (ip == nip)
1419	return 0;
1420	}
1421
1422	error = gfs2_rindex_update(sdp);
1423	if (error)
1424	return error;
1425
1426	error = gfs2_qa_get(ip: ndip);
1427	if (error)
1428	return error;
1429
1430	if (odip != ndip) {
1431	error = gfs2_glock_nq_init(gl: sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1432	flags: 0, gh: &r_gh);
1433	if (error)
1434	goto out;
1435
1436	if (S_ISDIR(ip->i_inode.i_mode)) {
1437	dir_rename = 1;
1438	/* don't move a directory into its subdir */
1439	error = gfs2_ok_to_move(this: ip, to: ndip);
1440	if (error)
1441	goto out_gunlock_r;
1442	}
1443	}
1444
1445	num_gh = 1;
1446	gfs2_holder_init(gl: odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, gh: ghs);
1447	if (odip != ndip) {
1448	gfs2_holder_init(gl: ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC,
1449	gh: ghs + num_gh);
1450	num_gh++;
1451	}
1452	gfs2_holder_init(gl: ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, gh: ghs + num_gh);
1453	num_gh++;
1454
1455	if (nip) {
1456	gfs2_holder_init(gl: nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1457	gh: ghs + num_gh);
1458	num_gh++;
1459	}
1460
1461	for (x = 0; x < num_gh; x++) {
1462	error = gfs2_glock_nq(gh: ghs + x);
1463	if (error)
1464	goto out_gunlock;
1465	}
1466	error = gfs2_glock_async_wait(num_gh, ghs);
1467	if (error)
1468	goto out_gunlock;
1469
1470	if (nip) {
1471	/* Grab the resource group glock for unlink flag twiddling.
1472	* This is the case where the target dinode already exists
1473	* so we unlink before doing the rename.
1474	*/
1475	nrgd = gfs2_blk2rgrpd(sdp, blk: nip->i_no_addr, exact: 1);
1476	if (!nrgd) {
1477	error = -ENOENT;
1478	goto out_gunlock;
1479	}
1480	error = gfs2_glock_nq_init(gl: nrgd->rd_gl, LM_ST_EXCLUSIVE,
1481	LM_FLAG_NODE_SCOPE, gh: &rd_gh);
1482	if (error)
1483	goto out_gunlock;
1484	}
1485
1486	error = -ENOENT;
1487	if (ip->i_inode.i_nlink == 0)
1488	goto out_gunlock;
1489
1490	/* Check out the old directory */
1491
1492	error = gfs2_unlink_ok(dip: odip, name: &odentry->d_name, ip);
1493	if (error)
1494	goto out_gunlock;
1495
1496	/* Check out the new directory */
1497
1498	if (nip) {
1499	error = gfs2_unlink_ok(dip: ndip, name: &ndentry->d_name, ip: nip);
1500	if (error)
1501	goto out_gunlock;
1502
1503	if (nip->i_inode.i_nlink == 0) {
1504	error = -EAGAIN;
1505	goto out_gunlock;
1506	}
1507
1508	if (S_ISDIR(nip->i_inode.i_mode)) {
1509	if (nip->i_entries < 2) {
1510	gfs2_consist_inode(nip);
1511	error = -EIO;
1512	goto out_gunlock;
1513	}
1514	if (nip->i_entries > 2) {
1515	error = -ENOTEMPTY;
1516	goto out_gunlock;
1517	}
1518	}
1519	} else {
1520	error = gfs2_permission(idmap: &nop_mnt_idmap, inode: ndir,
1521	MAY_WRITE | MAY_EXEC);
1522	if (error)
1523	goto out_gunlock;
1524
1525	error = gfs2_dir_check(dir: ndir, filename: &ndentry->d_name, NULL);
1526	switch (error) {
1527	case -ENOENT:
1528	error = 0;
1529	break;
1530	case 0:
1531	error = -EEXIST;
1532	goto out_gunlock;
1533	default:
1534	goto out_gunlock;
1535	}
1536
1537	if (odip != ndip) {
1538	if (!ndip->i_inode.i_nlink) {
1539	error = -ENOENT;
1540	goto out_gunlock;
1541	}
1542	if (ndip->i_entries == (u32)-1) {
1543	error = -EFBIG;
1544	goto out_gunlock;
1545	}
1546	if (S_ISDIR(ip->i_inode.i_mode) &&
1547	ndip->i_inode.i_nlink == (u32)-1) {
1548	error = -EMLINK;
1549	goto out_gunlock;
1550	}
1551	}
1552	}
1553
1554	/* Check out the dir to be renamed */
1555
1556	if (dir_rename) {
1557	error = gfs2_permission(idmap: &nop_mnt_idmap, inode: d_inode(dentry: odentry),
1558	MAY_WRITE);
1559	if (error)
1560	goto out_gunlock;
1561	}
1562
1563	if (nip == NULL) {
1564	error = gfs2_diradd_alloc_required(dir: ndir, filename: &ndentry->d_name, da: &da);
1565	if (error)
1566	goto out_gunlock;
1567	}
1568
1569	if (da.nr_blocks) {
1570	struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1571	error = gfs2_quota_lock_check(ip: ndip, ap: &ap);
1572	if (error)
1573	goto out_gunlock;
1574
1575	error = gfs2_inplace_reserve(ip: ndip, ap: &ap);
1576	if (error)
1577	goto out_gunlock_q;
1578
1579	error = gfs2_trans_begin(sdp, blocks: gfs2_trans_da_blks(dip: ndip, da: &da, nr_inodes: 4) +
1580	4 * RES_LEAF + 4, revokes: 0);
1581	if (error)
1582	goto out_ipreserv;
1583	} else {
1584	error = gfs2_trans_begin(sdp, blocks: 4 * RES_DINODE +
1585	5 * RES_LEAF + 4, revokes: 0);
1586	if (error)
1587	goto out_gunlock;
1588	}
1589
1590	/* Remove the target file, if it exists */
1591
1592	if (nip)
1593	error = gfs2_unlink_inode(dip: ndip, dentry: ndentry);
1594
1595	error = update_moved_ino(ip, ndip, dir_rename);
1596	if (error)
1597	goto out_end_trans;
1598
1599	error = gfs2_dir_del(dip: odip, dentry: odentry);
1600	if (error)
1601	goto out_end_trans;
1602
1603	error = gfs2_dir_add(inode: ndir, filename: &ndentry->d_name, ip, da: &da);
1604	if (error)
1605	goto out_end_trans;
1606
1607	out_end_trans:
1608	gfs2_trans_end(sdp);
1609	out_ipreserv:
1610	if (da.nr_blocks)
1611	gfs2_inplace_release(ip: ndip);
1612	out_gunlock_q:
1613	if (da.nr_blocks)
1614	gfs2_quota_unlock(ip: ndip);
1615	out_gunlock:
1616	gfs2_dir_no_add(da: &da);
1617	if (gfs2_holder_initialized(gh: &rd_gh))
1618	gfs2_glock_dq_uninit(gh: &rd_gh);
1619
1620	while (x--) {
1621	if (gfs2_holder_queued(gh: ghs + x))
1622	gfs2_glock_dq(gh: ghs + x);
1623	gfs2_holder_uninit(gh: ghs + x);
1624	}
1625	out_gunlock_r:
1626	if (gfs2_holder_initialized(gh: &r_gh))
1627	gfs2_glock_dq_uninit(gh: &r_gh);
1628	out:
1629	gfs2_qa_put(ip: ndip);
1630	return error;
1631	}
1632
1633	/**
1634	* gfs2_exchange - exchange two files
1635	* @odir: Parent directory of old file name
1636	* @odentry: The old dentry of the file
1637	* @ndir: Parent directory of new file name
1638	* @ndentry: The new dentry of the file
1639	* @flags: The rename flags
1640	*
1641	* Returns: errno
1642	*/
1643
1644	static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1645	struct inode *ndir, struct dentry *ndentry,
1646	unsigned int flags)
1647	{
1648	struct gfs2_inode *odip = GFS2_I(inode: odir);
1649	struct gfs2_inode *ndip = GFS2_I(inode: ndir);
1650	struct gfs2_inode *oip = GFS2_I(inode: odentry->d_inode);
1651	struct gfs2_inode *nip = GFS2_I(inode: ndentry->d_inode);
1652	struct gfs2_sbd *sdp = GFS2_SB(inode: odir);
1653	struct gfs2_holder ghs[4], r_gh;
1654	unsigned int num_gh;
1655	unsigned int x;
1656	umode_t old_mode = oip->i_inode.i_mode;
1657	umode_t new_mode = nip->i_inode.i_mode;
1658	int error;
1659
1660	gfs2_holder_mark_uninitialized(gh: &r_gh);
1661	error = gfs2_rindex_update(sdp);
1662	if (error)
1663	return error;
1664
1665	if (odip != ndip) {
1666	error = gfs2_glock_nq_init(gl: sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1667	flags: 0, gh: &r_gh);
1668	if (error)
1669	goto out;
1670
1671	if (S_ISDIR(old_mode)) {
1672	/* don't move a directory into its subdir */
1673	error = gfs2_ok_to_move(this: oip, to: ndip);
1674	if (error)
1675	goto out_gunlock_r;
1676	}
1677
1678	if (S_ISDIR(new_mode)) {
1679	/* don't move a directory into its subdir */
1680	error = gfs2_ok_to_move(this: nip, to: odip);
1681	if (error)
1682	goto out_gunlock_r;
1683	}
1684	}
1685
1686	num_gh = 1;
1687	gfs2_holder_init(gl: odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, gh: ghs);
1688	if (odip != ndip) {
1689	gfs2_holder_init(gl: ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1690	gh: ghs + num_gh);
1691	num_gh++;
1692	}
1693	gfs2_holder_init(gl: oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, gh: ghs + num_gh);
1694	num_gh++;
1695
1696	gfs2_holder_init(gl: nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, gh: ghs + num_gh);
1697	num_gh++;
1698
1699	for (x = 0; x < num_gh; x++) {
1700	error = gfs2_glock_nq(gh: ghs + x);
1701	if (error)
1702	goto out_gunlock;
1703	}
1704
1705	error = gfs2_glock_async_wait(num_gh, ghs);
1706	if (error)
1707	goto out_gunlock;
1708
1709	error = -ENOENT;
1710	if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1711	goto out_gunlock;
1712
1713	error = gfs2_unlink_ok(dip: odip, name: &odentry->d_name, ip: oip);
1714	if (error)
1715	goto out_gunlock;
1716	error = gfs2_unlink_ok(dip: ndip, name: &ndentry->d_name, ip: nip);
1717	if (error)
1718	goto out_gunlock;
1719
1720	if (S_ISDIR(old_mode)) {
1721	error = gfs2_permission(idmap: &nop_mnt_idmap, inode: odentry->d_inode,
1722	MAY_WRITE);
1723	if (error)
1724	goto out_gunlock;
1725	}
1726	if (S_ISDIR(new_mode)) {
1727	error = gfs2_permission(idmap: &nop_mnt_idmap, inode: ndentry->d_inode,
1728	MAY_WRITE);
1729	if (error)
1730	goto out_gunlock;
1731	}
1732	error = gfs2_trans_begin(sdp, blocks: 4 * RES_DINODE + 4 * RES_LEAF, revokes: 0);
1733	if (error)
1734	goto out_gunlock;
1735
1736	error = update_moved_ino(ip: oip, ndip, S_ISDIR(old_mode));
1737	if (error)
1738	goto out_end_trans;
1739
1740	error = update_moved_ino(ip: nip, ndip: odip, S_ISDIR(new_mode));
1741	if (error)
1742	goto out_end_trans;
1743
1744	error = gfs2_dir_mvino(dip: ndip, filename: &ndentry->d_name, nip: oip,
1745	IF2DT(old_mode));
1746	if (error)
1747	goto out_end_trans;
1748
1749	error = gfs2_dir_mvino(dip: odip, filename: &odentry->d_name, nip,
1750	IF2DT(new_mode));
1751	if (error)
1752	goto out_end_trans;
1753
1754	if (odip != ndip) {
1755	if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1756	inc_nlink(inode: &odip->i_inode);
1757	drop_nlink(inode: &ndip->i_inode);
1758	} else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1759	inc_nlink(inode: &ndip->i_inode);
1760	drop_nlink(inode: &odip->i_inode);
1761	}
1762	}
1763	mark_inode_dirty(inode: &ndip->i_inode);
1764	if (odip != ndip)
1765	mark_inode_dirty(inode: &odip->i_inode);
1766
1767	out_end_trans:
1768	gfs2_trans_end(sdp);
1769	out_gunlock:
1770	while (x--) {
1771	if (gfs2_holder_queued(gh: ghs + x))
1772	gfs2_glock_dq(gh: ghs + x);
1773	gfs2_holder_uninit(gh: ghs + x);
1774	}
1775	out_gunlock_r:
1776	if (gfs2_holder_initialized(gh: &r_gh))
1777	gfs2_glock_dq_uninit(gh: &r_gh);
1778	out:
1779	return error;
1780	}
1781
1782	static int gfs2_rename2(struct mnt_idmap *idmap, struct inode *odir,
1783	struct dentry *odentry, struct inode *ndir,
1784	struct dentry *ndentry, unsigned int flags)
1785	{
1786	flags &= ~RENAME_NOREPLACE;
1787
1788	if (flags & ~RENAME_EXCHANGE)
1789	return -EINVAL;
1790
1791	if (flags & RENAME_EXCHANGE)
1792	return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1793
1794	return gfs2_rename(odir, odentry, ndir, ndentry);
1795	}
1796
1797	/**
1798	* gfs2_get_link - Follow a symbolic link
1799	* @dentry: The dentry of the link
1800	* @inode: The inode of the link
1801	* @done: destructor for return value
1802	*
1803	* This can handle symlinks of any size.
1804	*
1805	* Returns: 0 on success or error code
1806	*/
1807
1808	static const char *gfs2_get_link(struct dentry *dentry,
1809	struct inode *inode,
1810	struct delayed_call *done)
1811	{
1812	struct gfs2_inode *ip = GFS2_I(inode);
1813	struct gfs2_holder i_gh;
1814	struct buffer_head *dibh;
1815	unsigned int size;
1816	char *buf;
1817	int error;
1818
1819	if (!dentry)
1820	return ERR_PTR(error: -ECHILD);
1821
1822	gfs2_holder_init(gl: ip->i_gl, LM_ST_SHARED, flags: 0, gh: &i_gh);
1823	error = gfs2_glock_nq(gh: &i_gh);
1824	if (error) {
1825	gfs2_holder_uninit(gh: &i_gh);
1826	return ERR_PTR(error);
1827	}
1828
1829	size = (unsigned int)i_size_read(inode: &ip->i_inode);
1830	if (size == 0) {
1831	gfs2_consist_inode(ip);
1832	buf = ERR_PTR(error: -EIO);
1833	goto out;
1834	}
1835
1836	error = gfs2_meta_inode_buffer(ip, bhp: &dibh);
1837	if (error) {
1838	buf = ERR_PTR(error);
1839	goto out;
1840	}
1841
1842	buf = kzalloc(size: size + 1, GFP_NOFS);
1843	if (!buf)
1844	buf = ERR_PTR(error: -ENOMEM);
1845	else
1846	memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1847	brelse(bh: dibh);
1848	out:
1849	gfs2_glock_dq_uninit(gh: &i_gh);
1850	if (!IS_ERR(ptr: buf))
1851	set_delayed_call(call: done, fn: kfree_link, arg: buf);
1852	return buf;
1853	}
1854
1855	/**
1856	* gfs2_permission
1857	* @idmap: idmap of the mount the inode was found from
1858	* @inode: The inode
1859	* @mask: The mask to be tested
1860	*
1861	* This may be called from the VFS directly, or from within GFS2 with the
1862	* inode locked, so we look to see if the glock is already locked and only
1863	* lock the glock if its not already been done.
1864	*
1865	* Returns: errno
1866	*/
1867
1868	int gfs2_permission(struct mnt_idmap *idmap, struct inode *inode,
1869	int mask)
1870	{
1871	int may_not_block = mask & MAY_NOT_BLOCK;
1872	struct gfs2_inode *ip;
1873	struct gfs2_holder i_gh;
1874	struct gfs2_glock *gl;
1875	int error;
1876
1877	gfs2_holder_mark_uninitialized(gh: &i_gh);
1878	ip = GFS2_I(inode);
1879	gl = rcu_dereference_check(ip->i_gl, !may_not_block);
1880	if (unlikely(!gl)) {
1881	/* inode is getting torn down, must be RCU mode */
1882	WARN_ON_ONCE(!may_not_block);
1883	return -ECHILD;
1884	}
1885	if (gfs2_glock_is_locked_by_me(gl) == NULL) {
1886	if (may_not_block)
1887	return -ECHILD;
1888	error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, gh: &i_gh);
1889	if (error)
1890	return error;
1891	}
1892
1893	if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1894	error = -EPERM;
1895	else
1896	error = generic_permission(&nop_mnt_idmap, inode, mask);
1897	if (gfs2_holder_initialized(gh: &i_gh))
1898	gfs2_glock_dq_uninit(gh: &i_gh);
1899
1900	return error;
1901	}
1902
1903	static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1904	{
1905	setattr_copy(&nop_mnt_idmap, inode, attr);
1906	mark_inode_dirty(inode);
1907	return 0;
1908	}
1909
1910	static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1911	{
1912	int error;
1913
1914	if (current->journal_info)
1915	return __gfs2_setattr_simple(inode, attr);
1916
1917	error = gfs2_trans_begin(sdp: GFS2_SB(inode), RES_DINODE, revokes: 0);
1918	if (error)
1919	return error;
1920
1921	error = __gfs2_setattr_simple(inode, attr);
1922	gfs2_trans_end(sdp: GFS2_SB(inode));
1923	return error;
1924	}
1925
1926	static int setattr_chown(struct inode *inode, struct iattr *attr)
1927	{
1928	struct gfs2_inode *ip = GFS2_I(inode);
1929	struct gfs2_sbd *sdp = GFS2_SB(inode);
1930	kuid_t ouid, nuid;
1931	kgid_t ogid, ngid;
1932	int error;
1933	struct gfs2_alloc_parms ap = {};
1934
1935	ouid = inode->i_uid;
1936	ogid = inode->i_gid;
1937	nuid = attr->ia_uid;
1938	ngid = attr->ia_gid;
1939
1940	if (!(attr->ia_valid & ATTR_UID) || uid_eq(left: ouid, right: nuid))
1941	ouid = nuid = NO_UID_QUOTA_CHANGE;
1942	if (!(attr->ia_valid & ATTR_GID) || gid_eq(left: ogid, right: ngid))
1943	ogid = ngid = NO_GID_QUOTA_CHANGE;
1944	error = gfs2_qa_get(ip);
1945	if (error)
1946	return error;
1947
1948	error = gfs2_rindex_update(sdp);
1949	if (error)
1950	goto out;
1951
1952	error = gfs2_quota_lock(ip, uid: nuid, gid: ngid);
1953	if (error)
1954	goto out;
1955
1956	ap.target = gfs2_get_inode_blocks(inode: &ip->i_inode);
1957
1958	if (!uid_eq(left: ouid, NO_UID_QUOTA_CHANGE) ||
1959	!gid_eq(left: ogid, NO_GID_QUOTA_CHANGE)) {
1960	error = gfs2_quota_check(ip, uid: nuid, gid: ngid, ap: &ap);
1961	if (error)
1962	goto out_gunlock_q;
1963	}
1964
1965	error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, revokes: 0);
1966	if (error)
1967	goto out_gunlock_q;
1968
1969	error = gfs2_setattr_simple(inode, attr);
1970	if (error)
1971	goto out_end_trans;
1972
1973	if (!uid_eq(left: ouid, NO_UID_QUOTA_CHANGE) ||
1974	!gid_eq(left: ogid, NO_GID_QUOTA_CHANGE)) {
1975	gfs2_quota_change(ip, change: -(s64)ap.target, uid: ouid, gid: ogid);
1976	gfs2_quota_change(ip, change: ap.target, uid: nuid, gid: ngid);
1977	}
1978
1979	out_end_trans:
1980	gfs2_trans_end(sdp);
1981	out_gunlock_q:
1982	gfs2_quota_unlock(ip);
1983	out:
1984	gfs2_qa_put(ip);
1985	return error;
1986	}
1987
1988	/**
1989	* gfs2_setattr - Change attributes on an inode
1990	* @idmap: idmap of the mount the inode was found from
1991	* @dentry: The dentry which is changing
1992	* @attr: The structure describing the change
1993	*
1994	* The VFS layer wants to change one or more of an inodes attributes. Write
1995	* that change out to disk.
1996	*
1997	* Returns: errno
1998	*/
1999
2000	static int gfs2_setattr(struct mnt_idmap *idmap,
2001	struct dentry *dentry, struct iattr *attr)
2002	{
2003	struct inode *inode = d_inode(dentry);
2004	struct gfs2_inode *ip = GFS2_I(inode);
2005	struct gfs2_holder i_gh;
2006	int error;
2007
2008	error = gfs2_qa_get(ip);
2009	if (error)
2010	return error;
2011
2012	error = gfs2_glock_nq_init(gl: ip->i_gl, LM_ST_EXCLUSIVE, flags: 0, gh: &i_gh);
2013	if (error)
2014	goto out;
2015
2016	error = may_setattr(idmap: &nop_mnt_idmap, inode, ia_valid: attr->ia_valid);
2017	if (error)
2018	goto error;
2019
2020	error = setattr_prepare(&nop_mnt_idmap, dentry, attr);
2021	if (error)
2022	goto error;
2023
2024	if (attr->ia_valid & ATTR_SIZE)
2025	error = gfs2_setattr_size(inode, size: attr->ia_size);
2026	else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
2027	error = setattr_chown(inode, attr);
2028	else {
2029	error = gfs2_setattr_simple(inode, attr);
2030	if (!error && attr->ia_valid & ATTR_MODE)
2031	error = posix_acl_chmod(&nop_mnt_idmap, dentry,
2032	inode->i_mode);
2033	}
2034
2035	error:
2036	if (!error)
2037	mark_inode_dirty(inode);
2038	gfs2_glock_dq_uninit(gh: &i_gh);
2039	out:
2040	gfs2_qa_put(ip);
2041	return error;
2042	}
2043
2044	/**
2045	* gfs2_getattr - Read out an inode's attributes
2046	* @idmap: idmap of the mount the inode was found from
2047	* @path: Object to query
2048	* @stat: The inode's stats
2049	* @request_mask: Mask of STATX_xxx flags indicating the caller's interests
2050	* @flags: AT_STATX_xxx setting
2051	*
2052	* This may be called from the VFS directly, or from within GFS2 with the
2053	* inode locked, so we look to see if the glock is already locked and only
2054	* lock the glock if its not already been done. Note that its the NFS
2055	* readdirplus operation which causes this to be called (from filldir)
2056	* with the glock already held.
2057	*
2058	* Returns: errno
2059	*/
2060
2061	static int gfs2_getattr(struct mnt_idmap *idmap,
2062	const struct path *path, struct kstat *stat,
2063	u32 request_mask, unsigned int flags)
2064	{
2065	struct inode *inode = d_inode(dentry: path->dentry);
2066	struct gfs2_inode *ip = GFS2_I(inode);
2067	struct gfs2_holder gh;
2068	u32 gfsflags;
2069	int error;
2070
2071	gfs2_holder_mark_uninitialized(gh: &gh);
2072	if (gfs2_glock_is_locked_by_me(gl: ip->i_gl) == NULL) {
2073	error = gfs2_glock_nq_init(gl: ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, gh: &gh);
2074	if (error)
2075	return error;
2076	}
2077
2078	gfsflags = ip->i_diskflags;
2079	if (gfsflags & GFS2_DIF_APPENDONLY)
2080	stat->attributes |= STATX_ATTR_APPEND;
2081	if (gfsflags & GFS2_DIF_IMMUTABLE)
2082	stat->attributes |= STATX_ATTR_IMMUTABLE;
2083
2084	stat->attributes_mask |= (STATX_ATTR_APPEND |
2085	STATX_ATTR_COMPRESSED |
2086	STATX_ATTR_ENCRYPTED |
2087	STATX_ATTR_IMMUTABLE |
2088	STATX_ATTR_NODUMP);
2089
2090	generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
2091
2092	if (gfs2_holder_initialized(gh: &gh))
2093	gfs2_glock_dq_uninit(gh: &gh);
2094
2095	return 0;
2096	}
2097
2098	static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2099	u64 start, u64 len)
2100	{
2101	struct gfs2_inode *ip = GFS2_I(inode);
2102	struct gfs2_holder gh;
2103	int ret;
2104
2105	inode_lock_shared(inode);
2106
2107	ret = gfs2_glock_nq_init(gl: ip->i_gl, LM_ST_SHARED, flags: 0, gh: &gh);
2108	if (ret)
2109	goto out;
2110
2111	ret = iomap_fiemap(inode, fieinfo, start, len, ops: &gfs2_iomap_ops);
2112
2113	gfs2_glock_dq_uninit(gh: &gh);
2114
2115	out:
2116	inode_unlock_shared(inode);
2117	return ret;
2118	}
2119
2120	loff_t gfs2_seek_data(struct file *file, loff_t offset)
2121	{
2122	struct inode *inode = file->f_mapping->host;
2123	struct gfs2_inode *ip = GFS2_I(inode);
2124	struct gfs2_holder gh;
2125	loff_t ret;
2126
2127	inode_lock_shared(inode);
2128	ret = gfs2_glock_nq_init(gl: ip->i_gl, LM_ST_SHARED, flags: 0, gh: &gh);
2129	if (!ret)
2130	ret = iomap_seek_data(inode, offset, ops: &gfs2_iomap_ops);
2131	gfs2_glock_dq_uninit(gh: &gh);
2132	inode_unlock_shared(inode);
2133
2134	if (ret < 0)
2135	return ret;
2136	return vfs_setpos(file, offset: ret, maxsize: inode->i_sb->s_maxbytes);
2137	}
2138
2139	loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2140	{
2141	struct inode *inode = file->f_mapping->host;
2142	struct gfs2_inode *ip = GFS2_I(inode);
2143	struct gfs2_holder gh;
2144	loff_t ret;
2145
2146	inode_lock_shared(inode);
2147	ret = gfs2_glock_nq_init(gl: ip->i_gl, LM_ST_SHARED, flags: 0, gh: &gh);
2148	if (!ret)
2149	ret = iomap_seek_hole(inode, offset, ops: &gfs2_iomap_ops);
2150	gfs2_glock_dq_uninit(gh: &gh);
2151	inode_unlock_shared(inode);
2152
2153	if (ret < 0)
2154	return ret;
2155	return vfs_setpos(file, offset: ret, maxsize: inode->i_sb->s_maxbytes);
2156	}
2157
2158	static int gfs2_update_time(struct inode *inode, int flags)
2159	{
2160	struct gfs2_inode *ip = GFS2_I(inode);
2161	struct gfs2_glock *gl = ip->i_gl;
2162	struct gfs2_holder *gh;
2163	int error;
2164
2165	gh = gfs2_glock_is_locked_by_me(gl);
2166	if (gh && gl->gl_state != LM_ST_EXCLUSIVE) {
2167	gfs2_glock_dq(gh);
2168	gfs2_holder_reinit(LM_ST_EXCLUSIVE, flags: 0, gh);
2169	error = gfs2_glock_nq(gh);
2170	if (error)
2171	return error;
2172	}
2173	generic_update_time(inode, flags);
2174	return 0;
2175	}
2176
2177	static const struct inode_operations gfs2_file_iops = {
2178	.permission = gfs2_permission,
2179	.setattr = gfs2_setattr,
2180	.getattr = gfs2_getattr,
2181	.listxattr = gfs2_listxattr,
2182	.fiemap = gfs2_fiemap,
2183	.get_inode_acl = gfs2_get_acl,
2184	.set_acl = gfs2_set_acl,
2185	.update_time = gfs2_update_time,
2186	.fileattr_get = gfs2_fileattr_get,
2187	.fileattr_set = gfs2_fileattr_set,
2188	};
2189
2190	static const struct inode_operations gfs2_dir_iops = {
2191	.create = gfs2_create,
2192	.lookup = gfs2_lookup,
2193	.link = gfs2_link,
2194	.unlink = gfs2_unlink,
2195	.symlink = gfs2_symlink,
2196	.mkdir = gfs2_mkdir,
2197	.rmdir = gfs2_unlink,
2198	.mknod = gfs2_mknod,
2199	.rename = gfs2_rename2,
2200	.permission = gfs2_permission,
2201	.setattr = gfs2_setattr,
2202	.getattr = gfs2_getattr,
2203	.listxattr = gfs2_listxattr,
2204	.fiemap = gfs2_fiemap,
2205	.get_inode_acl = gfs2_get_acl,
2206	.set_acl = gfs2_set_acl,
2207	.update_time = gfs2_update_time,
2208	.atomic_open = gfs2_atomic_open,
2209	.fileattr_get = gfs2_fileattr_get,
2210	.fileattr_set = gfs2_fileattr_set,
2211	};
2212
2213	static const struct inode_operations gfs2_symlink_iops = {
2214	.get_link = gfs2_get_link,
2215	.permission = gfs2_permission,
2216	.setattr = gfs2_setattr,
2217	.getattr = gfs2_getattr,
2218	.listxattr = gfs2_listxattr,
2219	.fiemap = gfs2_fiemap,
2220	};
2221
2222