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[mirror_ubuntu-jammy-kernel.git] / fs / gfs2 / inode.c
CommitLineData
7336d0e6 1// SPDX-License-Identifier: GPL-2.0-only
b3b94faa
DT
2/*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
f2741d98 4 * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
b3b94faa
DT
5 */
6
b3b94faa
DT
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>
b3b94faa 12#include <linux/mm.h>
5b825c3a 13#include <linux/cred.h>
b3b94faa
DT
14#include <linux/xattr.h>
15#include <linux/posix_acl.h>
5c676f6d 16#include <linux/gfs2_ondisk.h>
71b86f56 17#include <linux/crc32.h>
aac1a55b 18#include <linux/iomap.h>
194c011f 19#include <linux/security.h>
10c5db28 20#include <linux/fiemap.h>
7c0f6ba6 21#include <linux/uaccess.h>
b3b94faa
DT
22
23#include "gfs2.h"
5c676f6d 24#include "incore.h"
b3b94faa
DT
25#include "acl.h"
26#include "bmap.h"
27#include "dir.h"
307cf6e6 28#include "xattr.h"
b3b94faa
DT
29#include "glock.h"
30#include "inode.h"
31#include "meta_io.h"
b3b94faa
DT
32#include "quota.h"
33#include "rgrp.h"
34#include "trans.h"
5c676f6d 35#include "util.h"
b2760583 36#include "super.h"
194c011f
SW
37#include "glops.h"
38
cda9dd42 39static int iget_test(struct inode *inode, void *opaque)
194c011f 40{
cda9dd42
AG
41 u64 no_addr = *(u64 *)opaque;
42
43 return GFS2_I(inode)->i_no_addr == no_addr;
44}
45
46static int iget_set(struct inode *inode, void *opaque)
47{
48 u64 no_addr = *(u64 *)opaque;
49
50 GFS2_I(inode)->i_no_addr = no_addr;
51 inode->i_ino = no_addr;
52 return 0;
53}
54
3ce37b2c
AG
55static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
56{
57 struct inode *inode;
58
59repeat:
cda9dd42 60 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
3ce37b2c
AG
61 if (!inode)
62 return inode;
63 if (is_bad_inode(inode)) {
64 iput(inode);
65 goto repeat;
66 }
3ce37b2c 67 return inode;
194c011f
SW
68}
69
70/**
71 * gfs2_set_iop - Sets inode operations
72 * @inode: The inode with correct i_mode filled in
73 *
74 * GFS2 lookup code fills in vfs inode contents based on info obtained
75 * from directory entry inside gfs2_inode_lookup().
76 */
77
78static void gfs2_set_iop(struct inode *inode)
79{
80 struct gfs2_sbd *sdp = GFS2_SB(inode);
81 umode_t mode = inode->i_mode;
82
83 if (S_ISREG(mode)) {
84 inode->i_op = &gfs2_file_iops;
85 if (gfs2_localflocks(sdp))
86 inode->i_fop = &gfs2_file_fops_nolock;
87 else
88 inode->i_fop = &gfs2_file_fops;
89 } else if (S_ISDIR(mode)) {
90 inode->i_op = &gfs2_dir_iops;
91 if (gfs2_localflocks(sdp))
92 inode->i_fop = &gfs2_dir_fops_nolock;
93 else
94 inode->i_fop = &gfs2_dir_fops;
95 } else if (S_ISLNK(mode)) {
96 inode->i_op = &gfs2_symlink_iops;
97 } else {
98 inode->i_op = &gfs2_file_iops;
99 init_special_inode(inode, inode->i_mode, inode->i_rdev);
100 }
101}
102
103/**
104 * gfs2_inode_lookup - Lookup an inode
105 * @sb: The super block
194c011f 106 * @type: The type of the inode
3ce37b2c
AG
107 * @no_addr: The inode number
108 * @no_formal_ino: The inode generation number
109 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
61b91cfd 110 * GFS2_BLKST_FREE to indicate not to verify)
3ce37b2c
AG
111 *
112 * If @type is DT_UNKNOWN, the inode type is fetched from disk.
113 *
114 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
115 * placeholder because it doesn't otherwise make sense), the on-disk block type
116 * is verified to be @blktype.
194c011f 117 *
b66648ad
AG
118 * When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE)
119 * if it detects that @no_formal_ino doesn't match the actual inode generation
120 * number. However, it doesn't always know unless @type is DT_UNKNOWN.
121 *
194c011f
SW
122 * Returns: A VFS inode, or an error
123 */
124
125struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
3ce37b2c
AG
126 u64 no_addr, u64 no_formal_ino,
127 unsigned int blktype)
194c011f
SW
128{
129 struct inode *inode;
130 struct gfs2_inode *ip;
131 struct gfs2_glock *io_gl = NULL;
3ce37b2c 132 struct gfs2_holder i_gh;
194c011f
SW
133 int error;
134
6df9f9a2 135 gfs2_holder_mark_uninitialized(&i_gh);
3ce37b2c 136 inode = gfs2_iget(sb, no_addr);
194c011f 137 if (!inode)
ac3beb6a 138 return ERR_PTR(-ENOMEM);
194c011f 139
e97321fa 140 ip = GFS2_I(inode);
e97321fa 141
194c011f
SW
142 if (inode->i_state & I_NEW) {
143 struct gfs2_sbd *sdp = GFS2_SB(inode);
194c011f
SW
144
145 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
146 if (unlikely(error))
147 goto fail;
4fd1a579 148 flush_delayed_work(&ip->i_gl->gl_work);
194c011f
SW
149
150 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
151 if (unlikely(error))
40e7e86e 152 goto fail;
194c011f 153
3ce37b2c
AG
154 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
155 /*
156 * The GL_SKIP flag indicates to skip reading the inode
157 * block. We read the inode with gfs2_inode_refresh
158 * after possibly checking the block type.
159 */
160 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
161 GL_SKIP, &i_gh);
162 if (error)
40e7e86e 163 goto fail;
3ce37b2c 164
b66648ad
AG
165 error = -ESTALE;
166 if (no_formal_ino &&
167 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino))
168 goto fail;
169
3ce37b2c
AG
170 if (blktype != GFS2_BLKST_FREE) {
171 error = gfs2_check_blk_type(sdp, no_addr,
172 blktype);
173 if (error)
40e7e86e 174 goto fail;
3ce37b2c
AG
175 }
176 }
177
4d7c18c7 178 glock_set_object(ip->i_gl, ip);
194c011f
SW
179 set_bit(GIF_INVALID, &ip->i_flags);
180 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
181 if (unlikely(error))
40e7e86e 182 goto fail;
a0e3cc65 183 gfs2_cancel_delete_work(ip->i_iopen_gh.gh_gl);
4fd1a579 184 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
194c011f
SW
185 gfs2_glock_put(io_gl);
186 io_gl = NULL;
187
2b0fb353
AG
188 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
189 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1);
190 inode->i_atime.tv_nsec = 0;
191
194c011f
SW
192 if (type == DT_UNKNOWN) {
193 /* Inode glock must be locked already */
194 error = gfs2_inode_refresh(GFS2_I(inode));
195 if (error)
40e7e86e 196 goto fail;
194c011f 197 } else {
2b0fb353 198 ip->i_no_formal_ino = no_formal_ino;
194c011f
SW
199 inode->i_mode = DT2IF(type);
200 }
201
b66648ad
AG
202 if (gfs2_holder_initialized(&i_gh))
203 gfs2_glock_dq_uninit(&i_gh);
204
194c011f 205 gfs2_set_iop(inode);
b66648ad 206 }
332f51d7 207
b66648ad
AG
208 if (no_formal_ino && ip->i_no_formal_ino &&
209 no_formal_ino != ip->i_no_formal_ino) {
5902f4dd 210 error = -ESTALE;
b66648ad
AG
211 if (inode->i_state & I_NEW)
212 goto fail;
213 iput(inode);
5902f4dd 214 return ERR_PTR(error);
194c011f
SW
215 }
216
b66648ad
AG
217 if (inode->i_state & I_NEW)
218 unlock_new_inode(inode);
219
194c011f
SW
220 return inode;
221
40e7e86e 222fail:
194c011f
SW
223 if (io_gl)
224 gfs2_glock_put(io_gl);
6df9f9a2 225 if (gfs2_holder_initialized(&i_gh))
3ce37b2c 226 gfs2_glock_dq_uninit(&i_gh);
194c011f
SW
227 iget_failed(inode);
228 return ERR_PTR(error);
229}
230
6bdcadea
AG
231/**
232 * gfs2_lookup_by_inum - look up an inode by inode number
233 * @sdp: The super block
234 * @no_addr: The inode number
235 * @no_formal_ino: The inode generation number (0 for any)
236 * @blktype: Requested block type (see gfs2_inode_lookup)
237 */
194c011f 238struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
6bdcadea 239 u64 no_formal_ino, unsigned int blktype)
194c011f
SW
240{
241 struct super_block *sb = sdp->sd_vfs;
3ce37b2c 242 struct inode *inode;
194c011f
SW
243 int error;
244
b66648ad
AG
245 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino,
246 blktype);
194c011f 247 if (IS_ERR(inode))
3ce37b2c 248 return inode;
194c011f 249
194c011f 250 if (no_formal_ino) {
194c011f
SW
251 error = -EIO;
252 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
253 goto fail_iput;
194c011f 254 }
3ce37b2c 255 return inode;
194c011f 256
194c011f
SW
257fail_iput:
258 iput(inode);
3ce37b2c 259 return ERR_PTR(error);
194c011f
SW
260}
261
262
263struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
264{
265 struct qstr qstr;
266 struct inode *inode;
267 gfs2_str2qstr(&qstr, name);
268 inode = gfs2_lookupi(dip, &qstr, 1);
269 /* gfs2_lookupi has inconsistent callers: vfs
270 * related routines expect NULL for no entry found,
271 * gfs2_lookup_simple callers expect ENOENT
272 * and do not check for NULL.
273 */
274 if (inode == NULL)
275 return ERR_PTR(-ENOENT);
276 else
277 return inode;
278}
279
280
281/**
282 * gfs2_lookupi - Look up a filename in a directory and return its inode
283 * @d_gh: An initialized holder for the directory glock
284 * @name: The name of the inode to look for
285 * @is_root: If 1, ignore the caller's permissions
286 * @i_gh: An uninitialized holder for the new inode glock
287 *
288 * This can be called via the VFS filldir function when NFS is doing
289 * a readdirplus and the inode which its intending to stat isn't
290 * already in cache. In this case we must not take the directory glock
291 * again, since the readdir call will have already taken that lock.
292 *
293 * Returns: errno
294 */
295
296struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
297 int is_root)
298{
299 struct super_block *sb = dir->i_sb;
300 struct gfs2_inode *dip = GFS2_I(dir);
301 struct gfs2_holder d_gh;
302 int error = 0;
303 struct inode *inode = NULL;
194c011f 304
6df9f9a2 305 gfs2_holder_mark_uninitialized(&d_gh);
194c011f
SW
306 if (!name->len || name->len > GFS2_FNAMESIZE)
307 return ERR_PTR(-ENAMETOOLONG);
308
309 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
310 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
2b0143b5 311 dir == d_inode(sb->s_root))) {
194c011f
SW
312 igrab(dir);
313 return dir;
314 }
315
316 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
317 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
318 if (error)
319 return ERR_PTR(error);
194c011f
SW
320 }
321
322 if (!is_root) {
10556cb2 323 error = gfs2_permission(dir, MAY_EXEC);
194c011f
SW
324 if (error)
325 goto out;
326 }
327
5a00f3cc 328 inode = gfs2_dir_search(dir, name, false);
194c011f
SW
329 if (IS_ERR(inode))
330 error = PTR_ERR(inode);
331out:
6df9f9a2 332 if (gfs2_holder_initialized(&d_gh))
194c011f
SW
333 gfs2_glock_dq_uninit(&d_gh);
334 if (error == -ENOENT)
335 return NULL;
336 return inode ? inode : ERR_PTR(error);
337}
338
339/**
340 * create_ok - OK to create a new on-disk inode here?
341 * @dip: Directory in which dinode is to be created
342 * @name: Name of new dinode
343 * @mode:
344 *
345 * Returns: errno
346 */
347
348static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
175a4eb7 349 umode_t mode)
194c011f
SW
350{
351 int error;
352
10556cb2 353 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
194c011f
SW
354 if (error)
355 return error;
356
357 /* Don't create entries in an unlinked directory */
358 if (!dip->i_inode.i_nlink)
359 return -ENOENT;
360
194c011f
SW
361 if (dip->i_entries == (u32)-1)
362 return -EFBIG;
363 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
364 return -EMLINK;
365
366 return 0;
367}
368
c9aecf73
SW
369static void munge_mode_uid_gid(const struct gfs2_inode *dip,
370 struct inode *inode)
194c011f
SW
371{
372 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
6b24c0d2
EB
373 (dip->i_inode.i_mode & S_ISUID) &&
374 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
c9aecf73
SW
375 if (S_ISDIR(inode->i_mode))
376 inode->i_mode |= S_ISUID;
6b24c0d2 377 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
c9aecf73
SW
378 inode->i_mode &= ~07111;
379 inode->i_uid = dip->i_inode.i_uid;
194c011f 380 } else
c9aecf73 381 inode->i_uid = current_fsuid();
194c011f
SW
382
383 if (dip->i_inode.i_mode & S_ISGID) {
c9aecf73
SW
384 if (S_ISDIR(inode->i_mode))
385 inode->i_mode |= S_ISGID;
386 inode->i_gid = dip->i_inode.i_gid;
194c011f 387 } else
c9aecf73 388 inode->i_gid = current_fsgid();
194c011f
SW
389}
390
b2c8b3ea 391static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
194c011f 392{
c9aecf73 393 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
b2c8b3ea 394 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
194c011f
SW
395 int error;
396
b8fbf471 397 error = gfs2_quota_lock_check(ip, &ap);
194c011f
SW
398 if (error)
399 goto out;
400
7b9cff46 401 error = gfs2_inplace_reserve(ip, &ap);
fd4b4e04
SW
402 if (error)
403 goto out_quota;
404
b2c8b3ea 405 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
194c011f
SW
406 if (error)
407 goto out_ipreserv;
408
b2c8b3ea 409 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
c9aecf73
SW
410 ip->i_no_formal_ino = ip->i_generation;
411 ip->i_inode.i_ino = ip->i_no_addr;
412 ip->i_goal = ip->i_no_addr;
194c011f
SW
413
414 gfs2_trans_end(sdp);
415
416out_ipreserv:
c9aecf73 417 gfs2_inplace_release(ip);
fd4b4e04
SW
418out_quota:
419 gfs2_quota_unlock(ip);
194c011f 420out:
194c011f
SW
421 return error;
422}
423
f2741d98
SW
424static void gfs2_init_dir(struct buffer_head *dibh,
425 const struct gfs2_inode *parent)
e2d0a13b
SW
426{
427 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
428 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
429
430 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
431 dent->de_inum = di->di_num; /* already GFS2 endian */
432 dent->de_type = cpu_to_be16(DT_DIR);
433
434 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
435 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
436 gfs2_inum_out(parent, dent);
437 dent->de_type = cpu_to_be16(DT_DIR);
438
439}
440
b2c8b3ea
SW
441/**
442 * gfs2_init_xattr - Initialise an xattr block for a new inode
443 * @ip: The inode in question
444 *
445 * This sets up an empty xattr block for a new inode, ready to
446 * take any ACLs, LSM xattrs, etc.
447 */
448
449static void gfs2_init_xattr(struct gfs2_inode *ip)
450{
451 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
452 struct buffer_head *bh;
453 struct gfs2_ea_header *ea;
454
455 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
456 gfs2_trans_add_meta(ip->i_gl, bh);
457 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
458 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
459
460 ea = GFS2_EA_BH2FIRST(bh);
461 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
462 ea->ea_type = GFS2_EATYPE_UNUSED;
463 ea->ea_flags = GFS2_EAFLAG_LAST;
464
465 brelse(bh);
466}
467
194c011f
SW
468/**
469 * init_dinode - Fill in a new dinode structure
f2741d98 470 * @dip: The directory this inode is being created in
c9aecf73 471 * @ip: The inode
f2741d98 472 * @symname: The symlink destination (if a symlink)
f2741d98 473 * @bhp: The buffer head (returned to caller)
194c011f
SW
474 *
475 */
476
c9aecf73 477static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
79ba7480 478 const char *symname)
194c011f 479{
194c011f
SW
480 struct gfs2_dinode *di;
481 struct buffer_head *dibh;
194c011f 482
c9aecf73 483 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
350a9b0a 484 gfs2_trans_add_meta(ip->i_gl, dibh);
194c011f 485 di = (struct gfs2_dinode *)dibh->b_data;
79ba7480 486 gfs2_dinode_out(ip, di);
194c011f 487
c9aecf73
SW
488 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
489 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
194c011f 490 di->__pad1 = 0;
194c011f
SW
491 di->__pad2 = 0;
492 di->__pad3 = 0;
194c011f 493 memset(&di->__pad4, 0, sizeof(di->__pad4));
194c011f 494 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
79ba7480 495 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
160b4026 496
c9aecf73 497 switch(ip->i_inode.i_mode & S_IFMT) {
160b4026 498 case S_IFDIR:
e2d0a13b 499 gfs2_init_dir(dibh, dip);
160b4026
SW
500 break;
501 case S_IFLNK:
c9aecf73 502 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
160b4026 503 break;
e2d0a13b
SW
504 }
505
194c011f 506 set_buffer_uptodate(dibh);
79ba7480 507 brelse(dibh);
194c011f
SW
508}
509
534cf9ca
SW
510/**
511 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
512 * @dip: The directory we are linking into
513 * @da: The dir add information
514 * @nr_inodes: The number of inodes involved
515 *
516 * This calculate the number of blocks we need to reserve in a
517 * transaction to link @nr_inodes into a directory. In most cases
518 * @nr_inodes will be 2 (the directory plus the inode being linked in)
519 * but in case of rename, 4 may be required.
520 *
521 * Returns: Number of blocks
522 */
523
524static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
525 const struct gfs2_diradd *da,
526 unsigned nr_inodes)
527{
528 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
529 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
530}
531
194c011f 532static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
3c1c0ae1 533 struct gfs2_inode *ip, struct gfs2_diradd *da)
194c011f
SW
534{
535 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
3c1c0ae1 536 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
194c011f
SW
537 int error;
538
3c1c0ae1 539 if (da->nr_blocks) {
b8fbf471 540 error = gfs2_quota_lock_check(dip, &ap);
194c011f
SW
541 if (error)
542 goto fail_quota_locks;
543
7b9cff46 544 error = gfs2_inplace_reserve(dip, &ap);
194c011f
SW
545 if (error)
546 goto fail_quota_locks;
547
534cf9ca 548 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
194c011f
SW
549 if (error)
550 goto fail_ipreserv;
551 } else {
552 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
553 if (error)
554 goto fail_quota_locks;
555 }
556
2b47dad8 557 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
194c011f 558
194c011f 559 gfs2_trans_end(sdp);
194c011f 560fail_ipreserv:
fd4b4e04 561 gfs2_inplace_release(dip);
194c011f
SW
562fail_quota_locks:
563 gfs2_quota_unlock(dip);
194c011f
SW
564 return error;
565}
566
46cc1e5f 567static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
9d8f13ba 568 void *fs_info)
194c011f 569{
9d8f13ba
MZ
570 const struct xattr *xattr;
571 int err = 0;
572
573 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
574 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
575 xattr->value_len, 0,
576 GFS2_EATYPE_SECURITY);
577 if (err < 0)
578 break;
194c011f 579 }
194c011f
SW
580 return err;
581}
b3b94faa 582
194c011f 583/**
f2741d98
SW
584 * gfs2_create_inode - Create a new inode
585 * @dir: The parent directory
586 * @dentry: The new dentry
6d4ade98 587 * @file: If non-NULL, the file which is being opened
f2741d98
SW
588 * @mode: The permissions on the new inode
589 * @dev: For device nodes, this is the device number
590 * @symname: For symlinks, this is the link destination
591 * @size: The initial size of the inode (ignored for directories)
194c011f 592 *
f2741d98 593 * Returns: 0 on success, or error code
194c011f
SW
594 */
595
f2741d98 596static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
6d4ade98 597 struct file *file,
175a4eb7 598 umode_t mode, dev_t dev, const char *symname,
b452a458 599 unsigned int size, int excl)
194c011f 600{
f2741d98 601 const struct qstr *name = &dentry->d_name;
e01580bf 602 struct posix_acl *default_acl, *acl;
f2741d98 603 struct gfs2_holder ghs[2];
194c011f 604 struct inode *inode = NULL;
8e2e0047 605 struct gfs2_inode *dip = GFS2_I(dir), *ip;
194c011f 606 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
a4923865 607 struct gfs2_glock *io_gl = NULL;
783013c0 608 int error, free_vfs_inode = 1;
9dbe9610 609 u32 aflags = 0;
b2c8b3ea 610 unsigned blocks = 1;
19aeb5a6 611 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
194c011f
SW
612
613 if (!name->len || name->len > GFS2_FNAMESIZE)
f2741d98 614 return -ENAMETOOLONG;
194c011f 615
2fba46a0 616 error = gfs2_qa_get(dip);
0a305e49
BP
617 if (error)
618 return error;
619
fd4b4e04
SW
620 error = gfs2_rindex_update(sdp);
621 if (error)
2fba46a0 622 goto fail;
fd4b4e04 623
f2741d98 624 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
194c011f
SW
625 if (error)
626 goto fail;
e0b62e21 627 gfs2_holder_mark_uninitialized(ghs + 1);
194c011f
SW
628
629 error = create_ok(dip, name, mode);
5a00f3cc
SW
630 if (error)
631 goto fail_gunlock;
632
633 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
634 error = PTR_ERR(inode);
635 if (!IS_ERR(inode)) {
571a4b57
AV
636 if (S_ISDIR(inode->i_mode)) {
637 iput(inode);
638 inode = ERR_PTR(-EISDIR);
639 goto fail_gunlock;
640 }
44bb31ba 641 d_instantiate(dentry, inode);
6d4ade98 642 error = 0;
0d0d1107 643 if (file) {
44bb31ba 644 if (S_ISREG(inode->i_mode))
be12af3e 645 error = finish_open(file, dentry, gfs2_open_common);
44bb31ba
AV
646 else
647 error = finish_no_open(file, NULL);
6d4ade98 648 }
9a63edd1 649 gfs2_glock_dq_uninit(ghs);
2297ab61 650 goto fail;
5a00f3cc 651 } else if (error != -ENOENT) {
194c011f 652 goto fail_gunlock;
5a00f3cc 653 }
194c011f 654
3c1c0ae1 655 error = gfs2_diradd_alloc_required(dir, name, &da);
fd4b4e04
SW
656 if (error < 0)
657 goto fail_gunlock;
658
c9aecf73 659 inode = new_inode(sdp->sd_vfs);
fd4b4e04
SW
660 error = -ENOMEM;
661 if (!inode)
662 goto fail_gunlock;
663
e01580bf
CH
664 error = posix_acl_create(dir, &mode, &default_acl, &acl);
665 if (error)
783013c0 666 goto fail_gunlock;
e01580bf 667
c9aecf73 668 ip = GFS2_I(inode);
2fba46a0 669 error = gfs2_qa_get(ip);
194c011f 670 if (error)
e01580bf 671 goto fail_free_acls;
c9aecf73 672
c9aecf73 673 inode->i_mode = mode;
79ba7480 674 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
c9aecf73
SW
675 inode->i_rdev = dev;
676 inode->i_size = size;
078cd827 677 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
c9aecf73 678 munge_mode_uid_gid(dip, inode);
00a158be 679 check_and_update_goal(dip);
c9aecf73 680 ip->i_goal = dip->i_goal;
28fb3027
SW
681 ip->i_diskflags = 0;
682 ip->i_eattr = 0;
683 ip->i_height = 0;
684 ip->i_depth = 0;
685 ip->i_entries = 0;
cc963a11 686 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
28fb3027
SW
687
688 switch(mode & S_IFMT) {
689 case S_IFREG:
690 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
691 gfs2_tune_get(sdp, gt_new_files_jdata))
692 ip->i_diskflags |= GFS2_DIF_JDATA;
693 gfs2_set_aops(inode);
694 break;
695 case S_IFDIR:
696 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
697 ip->i_diskflags |= GFS2_DIF_JDATA;
698 ip->i_entries = 2;
699 break;
700 }
acc546fd
AD
701
702 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
703 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
704 ip->i_diskflags |= GFS2_DIF_SYSTEM;
705
28fb3027 706 gfs2_set_inode_flags(inode);
194c011f 707
2b0143b5 708 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
9dbe9610
SW
709 (dip->i_diskflags & GFS2_DIF_TOPDIR))
710 aflags |= GFS2_AF_ORLOV;
711
b2c8b3ea
SW
712 if (default_acl || acl)
713 blocks++;
714
715 error = alloc_dinode(ip, aflags, &blocks);
194c011f 716 if (error)
c9aecf73 717 goto fail_free_inode;
194c011f 718
b2c8b3ea
SW
719 gfs2_set_inode_blocks(inode, blocks);
720
c9aecf73 721 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
194c011f 722 if (error)
c9aecf73 723 goto fail_free_inode;
98e5a91a 724 flush_delayed_work(&ip->i_gl->gl_work);
6f6597ba 725 glock_set_object(ip->i_gl, ip);
98e5a91a 726
c9aecf73
SW
727 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
728 if (error)
729 goto fail_free_inode;
730
b2c8b3ea 731 error = gfs2_trans_begin(sdp, blocks, 0);
c9aecf73 732 if (error)
2c47c1be 733 goto fail_free_inode;
194c011f 734
b2c8b3ea
SW
735 if (blocks > 1) {
736 ip->i_eattr = ip->i_no_addr + 1;
737 gfs2_init_xattr(ip);
738 }
79ba7480 739 init_dinode(dip, ip, symname);
fd4b4e04
SW
740 gfs2_trans_end(sdp);
741
c9aecf73 742 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
194c011f 743 if (error)
2c47c1be 744 goto fail_free_inode;
194c011f 745
a4923865
BP
746 BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags));
747
c9aecf73 748 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
ff7f4cb4
SW
749 if (error)
750 goto fail_gunlock2;
0a305e49 751
a0e3cc65 752 gfs2_cancel_delete_work(ip->i_iopen_gh.gh_gl);
6f6597ba 753 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
c9aecf73
SW
754 gfs2_set_iop(inode);
755 insert_inode_hash(inode);
756
783013c0
BP
757 free_vfs_inode = 0; /* After this point, the inode is no longer
758 considered free. Any failures need to undo
759 the gfs2 structures. */
e01580bf 760 if (default_acl) {
1a39ba99 761 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
6ff9b09e
AG
762 if (error)
763 goto fail_gunlock3;
e01580bf 764 posix_acl_release(default_acl);
6ff9b09e 765 default_acl = NULL;
e01580bf
CH
766 }
767 if (acl) {
6ff9b09e
AG
768 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
769 if (error)
770 goto fail_gunlock3;
e01580bf 771 posix_acl_release(acl);
6ff9b09e 772 acl = NULL;
e01580bf
CH
773 }
774
f45dc26d
BP
775 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
776 &gfs2_initxattrs, NULL);
194c011f 777 if (error)
c9aecf73 778 goto fail_gunlock3;
194c011f 779
3c1c0ae1 780 error = link_dinode(dip, name, ip, &da);
194c011f 781 if (error)
c9aecf73 782 goto fail_gunlock3;
194c011f 783
79ba7480 784 mark_inode_dirty(inode);
6d4ade98 785 d_instantiate(dentry, inode);
2c47c1be
BP
786 /* After instantiate, errors should result in evict which will destroy
787 * both inode and iopen glocks properly. */
c5bf8fef 788 if (file) {
73a09dd9 789 file->f_mode |= FMODE_CREATED;
be12af3e 790 error = finish_open(file, dentry, gfs2_open_common);
c5bf8fef 791 }
28fb3027 792 gfs2_glock_dq_uninit(ghs);
2297ab61 793 gfs2_qa_put(ip);
28fb3027 794 gfs2_glock_dq_uninit(ghs + 1);
a4923865 795 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
2c47c1be 796 gfs2_glock_put(io_gl);
2297ab61 797 gfs2_qa_put(dip);
6d4ade98 798 return error;
194c011f 799
c9aecf73 800fail_gunlock3:
9c1b2808 801 glock_clear_object(io_gl, ip);
783013c0 802 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
194c011f 803fail_gunlock2:
2c47c1be
BP
804 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
805 gfs2_glock_put(io_gl);
c9aecf73 806fail_free_inode:
9c1b2808
BP
807 if (ip->i_gl) {
808 glock_clear_object(ip->i_gl, ip);
1a0b00d1
BP
809 if (free_vfs_inode) /* else evict will do the put for us */
810 gfs2_glock_put(ip->i_gl);
9c1b2808 811 }
1595548f
AG
812 gfs2_rs_delete(ip, NULL);
813 gfs2_qa_put(ip);
e01580bf 814fail_free_acls:
6ff9b09e
AG
815 posix_acl_release(default_acl);
816 posix_acl_release(acl);
194c011f 817fail_gunlock:
2b47dad8 818 gfs2_dir_no_add(&da);
f2741d98 819 gfs2_glock_dq_uninit(ghs);
15a798f7 820 if (!IS_ERR_OR_NULL(inode)) {
79ba7480 821 clear_nlink(inode);
05978803
AD
822 if (!free_vfs_inode)
823 mark_inode_dirty(inode);
824 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
825 &GFS2_I(inode)->i_flags);
40ac218f
SW
826 iput(inode);
827 }
e0b62e21
AG
828 if (gfs2_holder_initialized(ghs + 1))
829 gfs2_glock_dq_uninit(ghs + 1);
194c011f 830fail:
2fba46a0 831 gfs2_qa_put(dip);
f2741d98 832 return error;
194c011f 833}
f2741d98 834
b3b94faa
DT
835/**
836 * gfs2_create - Create a file
837 * @dir: The directory in which to create the file
838 * @dentry: The dentry of the new file
839 * @mode: The mode of the new file
840 *
841 * Returns: errno
842 */
843
844static int gfs2_create(struct inode *dir, struct dentry *dentry,
ebfc3b49 845 umode_t mode, bool excl)
b3b94faa 846{
b452a458 847 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
b3b94faa
DT
848}
849
850/**
6d4ade98 851 * __gfs2_lookup - Look up a filename in a directory and return its inode
b3b94faa
DT
852 * @dir: The directory inode
853 * @dentry: The dentry of the new inode
6d4ade98 854 * @file: File to be opened
b3b94faa 855 *
b3b94faa
DT
856 *
857 * Returns: errno
858 */
859
6d4ade98 860static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
b452a458 861 struct file *file)
b3b94faa 862{
6d4ade98
SW
863 struct inode *inode;
864 struct dentry *d;
865 struct gfs2_holder gh;
866 struct gfs2_glock *gl;
867 int error;
868
869 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
7b7a9115
BC
870 if (inode == NULL) {
871 d_add(dentry, NULL);
6d4ade98 872 return NULL;
7b7a9115 873 }
6d4ade98
SW
874 if (IS_ERR(inode))
875 return ERR_CAST(inode);
876
877 gl = GFS2_I(inode)->i_gl;
878 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
879 if (error) {
880 iput(inode);
881 return ERR_PTR(error);
9656b2c1 882 }
6d4ade98
SW
883
884 d = d_splice_alias(inode, dentry);
d57b9c9a 885 if (IS_ERR(d)) {
d57b9c9a
BF
886 gfs2_glock_dq_uninit(&gh);
887 return d;
888 }
6d4ade98 889 if (file && S_ISREG(inode->i_mode))
be12af3e 890 error = finish_open(file, dentry, gfs2_open_common);
6d4ade98
SW
891
892 gfs2_glock_dq_uninit(&gh);
5ca1db41
MS
893 if (error) {
894 dput(d);
6d4ade98 895 return ERR_PTR(error);
5ca1db41 896 }
6d4ade98
SW
897 return d;
898}
899
900static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
901 unsigned flags)
902{
b452a458 903 return __gfs2_lookup(dir, dentry, NULL);
b3b94faa
DT
904}
905
906/**
907 * gfs2_link - Link to a file
908 * @old_dentry: The inode to link
909 * @dir: Add link to this directory
910 * @dentry: The name of the link
911 *
912 * Link the inode in "old_dentry" into the directory "dir" with the
913 * name in "dentry".
914 *
915 * Returns: errno
916 */
917
918static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
919 struct dentry *dentry)
920{
feaa7bba
SW
921 struct gfs2_inode *dip = GFS2_I(dir);
922 struct gfs2_sbd *sdp = GFS2_SB(dir);
2b0143b5 923 struct inode *inode = d_inode(old_dentry);
feaa7bba 924 struct gfs2_inode *ip = GFS2_I(inode);
b3b94faa 925 struct gfs2_holder ghs[2];
2baee03f 926 struct buffer_head *dibh;
19aeb5a6 927 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
b3b94faa
DT
928 int error;
929
b60623c2 930 if (S_ISDIR(inode->i_mode))
b3b94faa
DT
931 return -EPERM;
932
2fba46a0 933 error = gfs2_qa_get(dip);
0a305e49
BP
934 if (error)
935 return error;
936
b3b94faa
DT
937 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
938 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
939
72dbf479
BP
940 error = gfs2_glock_nq(ghs); /* parent */
941 if (error)
942 goto out_parent;
943
944 error = gfs2_glock_nq(ghs + 1); /* child */
b3b94faa 945 if (error)
72dbf479 946 goto out_child;
b3b94faa 947
d192a8e5
SW
948 error = -ENOENT;
949 if (inode->i_nlink == 0)
950 goto out_gunlock;
951
10556cb2 952 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
b3b94faa
DT
953 if (error)
954 goto out_gunlock;
955
dbb7cae2 956 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
b3b94faa
DT
957 switch (error) {
958 case -ENOENT:
959 break;
960 case 0:
961 error = -EEXIST;
962 default:
963 goto out_gunlock;
964 }
965
966 error = -EINVAL;
4f56110a 967 if (!dip->i_inode.i_nlink)
b3b94faa
DT
968 goto out_gunlock;
969 error = -EFBIG;
ad6203f2 970 if (dip->i_entries == (u32)-1)
b3b94faa
DT
971 goto out_gunlock;
972 error = -EPERM;
973 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
974 goto out_gunlock;
975 error = -EINVAL;
4f56110a 976 if (!ip->i_inode.i_nlink)
b3b94faa
DT
977 goto out_gunlock;
978 error = -EMLINK;
4f56110a 979 if (ip->i_inode.i_nlink == (u32)-1)
b3b94faa
DT
980 goto out_gunlock;
981
3c1c0ae1 982 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
c752666c 983 if (error < 0)
b3b94faa
DT
984 goto out_gunlock;
985
3c1c0ae1
SW
986 if (da.nr_blocks) {
987 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
b8fbf471 988 error = gfs2_quota_lock_check(dip, &ap);
b3b94faa 989 if (error)
5407e242 990 goto out_gunlock;
b3b94faa 991
7b9cff46 992 error = gfs2_inplace_reserve(dip, &ap);
b3b94faa
DT
993 if (error)
994 goto out_gunlock_q;
995
534cf9ca 996 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
b3b94faa
DT
997 if (error)
998 goto out_ipres;
999 } else {
1000 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
1001 if (error)
1002 goto out_ipres;
1003 }
1004
2baee03f 1005 error = gfs2_meta_inode_buffer(ip, &dibh);
b3b94faa
DT
1006 if (error)
1007 goto out_end_trans;
1008
2b47dad8 1009 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
2baee03f
SW
1010 if (error)
1011 goto out_brelse;
1012
350a9b0a 1013 gfs2_trans_add_meta(ip->i_gl, dibh);
2baee03f 1014 inc_nlink(&ip->i_inode);
078cd827 1015 ip->i_inode.i_ctime = current_time(&ip->i_inode);
ab9bbda0
SW
1016 ihold(inode);
1017 d_instantiate(dentry, inode);
1018 mark_inode_dirty(inode);
b3b94faa 1019
2baee03f
SW
1020out_brelse:
1021 brelse(dibh);
feaa7bba 1022out_end_trans:
b3b94faa 1023 gfs2_trans_end(sdp);
feaa7bba 1024out_ipres:
3c1c0ae1 1025 if (da.nr_blocks)
b3b94faa 1026 gfs2_inplace_release(dip);
feaa7bba 1027out_gunlock_q:
3c1c0ae1 1028 if (da.nr_blocks)
b3b94faa 1029 gfs2_quota_unlock(dip);
feaa7bba 1030out_gunlock:
2b47dad8 1031 gfs2_dir_no_add(&da);
72dbf479
BP
1032 gfs2_glock_dq(ghs + 1);
1033out_child:
1034 gfs2_glock_dq(ghs);
1035out_parent:
2297ab61 1036 gfs2_qa_put(dip);
b3b94faa
DT
1037 gfs2_holder_uninit(ghs);
1038 gfs2_holder_uninit(ghs + 1);
b3b94faa
DT
1039 return error;
1040}
1041
87ec2174
SW
1042/*
1043 * gfs2_unlink_ok - check to see that a inode is still in a directory
1044 * @dip: the directory
1045 * @name: the name of the file
1046 * @ip: the inode
1047 *
1048 * Assumes that the lock on (at least) @dip is held.
1049 *
1050 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1051 */
1052
1053static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1054 const struct gfs2_inode *ip)
1055{
1056 int error;
1057
1058 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1059 return -EPERM;
1060
1061 if ((dip->i_inode.i_mode & S_ISVTX) &&
6b24c0d2
EB
1062 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1063 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
87ec2174
SW
1064 return -EPERM;
1065
1066 if (IS_APPEND(&dip->i_inode))
1067 return -EPERM;
1068
10556cb2 1069 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
87ec2174
SW
1070 if (error)
1071 return error;
1072
37975f15 1073 return gfs2_dir_check(&dip->i_inode, name, ip);
87ec2174
SW
1074}
1075
b3b94faa 1076/**
855d23ce
SW
1077 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1078 * @dip: The parent directory
1079 * @name: The name of the entry in the parent directory
855d23ce
SW
1080 * @inode: The inode to be removed
1081 *
1082 * Called with all the locks and in a transaction. This will only be
1083 * called for a directory after it has been checked to ensure it is empty.
1084 *
1085 * Returns: 0 on success, or an error
1086 */
1087
1088static int gfs2_unlink_inode(struct gfs2_inode *dip,
4327a9bf 1089 const struct dentry *dentry)
855d23ce 1090{
2b0143b5 1091 struct inode *inode = d_inode(dentry);
855d23ce
SW
1092 struct gfs2_inode *ip = GFS2_I(inode);
1093 int error;
1094
1095 error = gfs2_dir_del(dip, dentry);
1096 if (error)
1097 return error;
1098
1099 ip->i_entries = 0;
078cd827 1100 inode->i_ctime = current_time(inode);
855d23ce
SW
1101 if (S_ISDIR(inode->i_mode))
1102 clear_nlink(inode);
1103 else
1104 drop_nlink(inode);
855d23ce
SW
1105 mark_inode_dirty(inode);
1106 if (inode->i_nlink == 0)
1107 gfs2_unlink_di(inode);
1108 return 0;
1109}
1110
1111
1112/**
1113 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1114 * @dir: The inode of the directory containing the inode to unlink
b3b94faa
DT
1115 * @dentry: The file itself
1116 *
855d23ce
SW
1117 * This routine uses the type of the inode as a flag to figure out
1118 * whether this is an unlink or an rmdir.
b3b94faa
DT
1119 *
1120 * Returns: errno
1121 */
1122
1123static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1124{
feaa7bba
SW
1125 struct gfs2_inode *dip = GFS2_I(dir);
1126 struct gfs2_sbd *sdp = GFS2_SB(dir);
2b0143b5 1127 struct inode *inode = d_inode(dentry);
855d23ce 1128 struct gfs2_inode *ip = GFS2_I(inode);
ddee7608
RC
1129 struct gfs2_holder ghs[3];
1130 struct gfs2_rgrpd *rgd;
5e2f7d61
BP
1131 int error;
1132
1133 error = gfs2_rindex_update(sdp);
1134 if (error)
1135 return error;
1136
1137 error = -EROFS;
b3b94faa 1138
b3b94faa 1139 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
ddee7608 1140 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
b3b94faa 1141
66fc061b 1142 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
a365fbf3 1143 if (!rgd)
87654896 1144 goto out_inodes;
a365fbf3 1145
ddee7608
RC
1146 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1147
1148
8497a46e 1149 error = gfs2_glock_nq(ghs); /* parent */
b3b94faa 1150 if (error)
8497a46e
SW
1151 goto out_parent;
1152
1153 error = gfs2_glock_nq(ghs + 1); /* child */
1154 if (error)
1155 goto out_child;
1156
d192a8e5 1157 error = -ENOENT;
855d23ce 1158 if (inode->i_nlink == 0)
d192a8e5
SW
1159 goto out_rgrp;
1160
855d23ce
SW
1161 if (S_ISDIR(inode->i_mode)) {
1162 error = -ENOTEMPTY;
1163 if (ip->i_entries > 2 || inode->i_nlink > 2)
1164 goto out_rgrp;
1165 }
1166
8497a46e
SW
1167 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1168 if (error)
1169 goto out_rgrp;
b3b94faa
DT
1170
1171 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1172 if (error)
72dbf479 1173 goto out_gunlock;
b3b94faa 1174
855d23ce 1175 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
855d23ce 1176 if (error)
2eb5909d 1177 goto out_gunlock;
b3b94faa 1178
4327a9bf 1179 error = gfs2_unlink_inode(dip, dentry);
feaa7bba 1180 gfs2_trans_end(sdp);
2eb5909d 1181
72dbf479 1182out_gunlock:
8497a46e
SW
1183 gfs2_glock_dq(ghs + 2);
1184out_rgrp:
8497a46e
SW
1185 gfs2_glock_dq(ghs + 1);
1186out_child:
8497a46e
SW
1187 gfs2_glock_dq(ghs);
1188out_parent:
87654896
SW
1189 gfs2_holder_uninit(ghs + 2);
1190out_inodes:
1191 gfs2_holder_uninit(ghs + 1);
8497a46e 1192 gfs2_holder_uninit(ghs);
b3b94faa
DT
1193 return error;
1194}
1195
1196/**
1197 * gfs2_symlink - Create a symlink
1198 * @dir: The directory to create the symlink in
1199 * @dentry: The dentry to put the symlink in
1200 * @symname: The thing which the link points to
1201 *
1202 * Returns: errno
1203 */
1204
1205static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1206 const char *symname)
1207{
160b4026 1208 unsigned int size;
b3b94faa 1209
b3b94faa 1210 size = strlen(symname);
235628c5 1211 if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
b3b94faa
DT
1212 return -ENAMETOOLONG;
1213
b452a458 1214 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
b3b94faa
DT
1215}
1216
1217/**
1218 * gfs2_mkdir - Make a directory
1219 * @dir: The parent directory of the new one
1220 * @dentry: The dentry of the new directory
1221 * @mode: The mode of the new directory
1222 *
1223 * Returns: errno
1224 */
1225
18bb1db3 1226static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
b3b94faa 1227{
235628c5 1228 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
b452a458 1229 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
b3b94faa
DT
1230}
1231
b3b94faa
DT
1232/**
1233 * gfs2_mknod - Make a special file
1234 * @dir: The directory in which the special file will reside
1235 * @dentry: The dentry of the special file
1236 * @mode: The mode of the special file
f2741d98 1237 * @dev: The device specification of the special file
b3b94faa
DT
1238 *
1239 */
1240
1a67aafb 1241static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
b3b94faa
DT
1242 dev_t dev)
1243{
b452a458 1244 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
6d4ade98
SW
1245}
1246
1247/**
1248 * gfs2_atomic_open - Atomically open a file
1249 * @dir: The directory
1250 * @dentry: The proposed new entry
1251 * @file: The proposed new struct file
1252 * @flags: open flags
1253 * @mode: File mode
6d4ade98
SW
1254 *
1255 * Returns: error code or 0 for success
1256 */
1257
1258static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
86fbca49 1259 struct file *file, unsigned flags,
44907d79 1260 umode_t mode)
6d4ade98
SW
1261{
1262 struct dentry *d;
1263 bool excl = !!(flags & O_EXCL);
1264
00699ad8 1265 if (!d_in_lookup(dentry))
4d93bc3e
AV
1266 goto skip_lookup;
1267
b452a458 1268 d = __gfs2_lookup(dir, dentry, file);
6d4ade98
SW
1269 if (IS_ERR(d))
1270 return PTR_ERR(d);
5ca1db41
MS
1271 if (d != NULL)
1272 dentry = d;
2b0143b5 1273 if (d_really_is_positive(dentry)) {
aad888f8 1274 if (!(file->f_mode & FMODE_OPENED))
ec7d879c 1275 return finish_no_open(file, d);
5ca1db41 1276 dput(d);
21039132 1277 return excl && (flags & O_CREAT) ? -EEXIST : 0;
6d4ade98
SW
1278 }
1279
5ca1db41 1280 BUG_ON(d != NULL);
4d93bc3e
AV
1281
1282skip_lookup:
6d4ade98
SW
1283 if (!(flags & O_CREAT))
1284 return -ENOENT;
1285
b452a458 1286 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl);
b3b94faa
DT
1287}
1288
0188d6c5
SW
1289/*
1290 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1291 * @this: move this
1292 * @to: to here
1293 *
1294 * Follow @to back to the root and make sure we don't encounter @this
1295 * Assumes we already hold the rename lock.
1296 *
1297 * Returns: errno
1298 */
1299
1300static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1301{
1302 struct inode *dir = &to->i_inode;
1303 struct super_block *sb = dir->i_sb;
1304 struct inode *tmp;
0188d6c5
SW
1305 int error = 0;
1306
0188d6c5
SW
1307 igrab(dir);
1308
1309 for (;;) {
1310 if (dir == &this->i_inode) {
1311 error = -EINVAL;
1312 break;
1313 }
2b0143b5 1314 if (dir == d_inode(sb->s_root)) {
0188d6c5
SW
1315 error = 0;
1316 break;
1317 }
1318
8d123585 1319 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
48f8f711
AD
1320 if (!tmp) {
1321 error = -ENOENT;
1322 break;
1323 }
0188d6c5
SW
1324 if (IS_ERR(tmp)) {
1325 error = PTR_ERR(tmp);
1326 break;
1327 }
1328
1329 iput(dir);
1330 dir = tmp;
1331 }
1332
1333 iput(dir);
1334
1335 return error;
1336}
1337
a63b7bbc
BM
1338/**
1339 * update_moved_ino - Update an inode that's being moved
1340 * @ip: The inode being moved
1341 * @ndip: The parent directory of the new filename
1342 * @dir_rename: True of ip is a directory
1343 *
1344 * Returns: errno
1345 */
1346
1347static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1348 int dir_rename)
1349{
a63b7bbc
BM
1350 if (dir_rename)
1351 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1352
078cd827 1353 ip->i_inode.i_ctime = current_time(&ip->i_inode);
83998ccd 1354 mark_inode_dirty_sync(&ip->i_inode);
a63b7bbc
BM
1355 return 0;
1356}
1357
1358
b3b94faa
DT
1359/**
1360 * gfs2_rename - Rename a file
1361 * @odir: Parent directory of old file name
1362 * @odentry: The old dentry of the file
1363 * @ndir: Parent directory of new file name
1364 * @ndentry: The new dentry of the file
1365 *
1366 * Returns: errno
1367 */
1368
1369static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1370 struct inode *ndir, struct dentry *ndentry)
1371{
feaa7bba
SW
1372 struct gfs2_inode *odip = GFS2_I(odir);
1373 struct gfs2_inode *ndip = GFS2_I(ndir);
2b0143b5 1374 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
b3b94faa 1375 struct gfs2_inode *nip = NULL;
feaa7bba 1376 struct gfs2_sbd *sdp = GFS2_SB(odir);
bc74aaef 1377 struct gfs2_holder ghs[4], r_gh, rd_gh;
ddee7608 1378 struct gfs2_rgrpd *nrgd;
b3b94faa
DT
1379 unsigned int num_gh;
1380 int dir_rename = 0;
19aeb5a6 1381 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
b3b94faa
DT
1382 unsigned int x;
1383 int error;
1384
6df9f9a2 1385 gfs2_holder_mark_uninitialized(&r_gh);
bc74aaef 1386 gfs2_holder_mark_uninitialized(&rd_gh);
2b0143b5
DH
1387 if (d_really_is_positive(ndentry)) {
1388 nip = GFS2_I(d_inode(ndentry));
b3b94faa
DT
1389 if (ip == nip)
1390 return 0;
1391 }
1392
5e2f7d61
BP
1393 error = gfs2_rindex_update(sdp);
1394 if (error)
1395 return error;
1396
2fba46a0 1397 error = gfs2_qa_get(ndip);
0a305e49
BP
1398 if (error)
1399 return error;
1400
0188d6c5
SW
1401 if (odip != ndip) {
1402 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1403 0, &r_gh);
b3b94faa
DT
1404 if (error)
1405 goto out;
1406
0188d6c5
SW
1407 if (S_ISDIR(ip->i_inode.i_mode)) {
1408 dir_rename = 1;
a63b7bbc 1409 /* don't move a directory into its subdir */
0188d6c5
SW
1410 error = gfs2_ok_to_move(ip, ndip);
1411 if (error)
1412 goto out_gunlock_r;
1413 }
b3b94faa
DT
1414 }
1415
d9d1ca30 1416 num_gh = 1;
ad26967b 1417 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
d9d1ca30 1418 if (odip != ndip) {
ad26967b
BP
1419 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC,
1420 ghs + num_gh);
d9d1ca30
SW
1421 num_gh++;
1422 }
ad26967b 1423 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
d9d1ca30 1424 num_gh++;
b3b94faa 1425
d9d1ca30 1426 if (nip) {
ad26967b
BP
1427 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1428 ghs + num_gh);
d9d1ca30
SW
1429 num_gh++;
1430 }
b3b94faa 1431
72dbf479
BP
1432 for (x = 0; x < num_gh; x++) {
1433 error = gfs2_glock_nq(ghs + x);
1434 if (error)
1435 goto out_gunlock;
1436 }
ad26967b
BP
1437 error = gfs2_glock_async_wait(num_gh, ghs);
1438 if (error)
1439 goto out_gunlock;
b3b94faa 1440
bc74aaef
BP
1441 if (nip) {
1442 /* Grab the resource group glock for unlink flag twiddling.
1443 * This is the case where the target dinode already exists
1444 * so we unlink before doing the rename.
1445 */
1446 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1447 if (!nrgd) {
1448 error = -ENOENT;
1449 goto out_gunlock;
1450 }
1451 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1452 &rd_gh);
1453 if (error)
1454 goto out_gunlock;
1455 }
1456
d192a8e5
SW
1457 error = -ENOENT;
1458 if (ip->i_inode.i_nlink == 0)
1459 goto out_gunlock;
1460
b3b94faa
DT
1461 /* Check out the old directory */
1462
1463 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1464 if (error)
1465 goto out_gunlock;
1466
1467 /* Check out the new directory */
1468
1469 if (nip) {
1470 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1471 if (error)
1472 goto out_gunlock;
1473
d192a8e5
SW
1474 if (nip->i_inode.i_nlink == 0) {
1475 error = -EAGAIN;
1476 goto out_gunlock;
1477 }
1478
b60623c2 1479 if (S_ISDIR(nip->i_inode.i_mode)) {
ad6203f2 1480 if (nip->i_entries < 2) {
94fb763b 1481 gfs2_consist_inode(nip);
b3b94faa
DT
1482 error = -EIO;
1483 goto out_gunlock;
1484 }
ad6203f2 1485 if (nip->i_entries > 2) {
b3b94faa
DT
1486 error = -ENOTEMPTY;
1487 goto out_gunlock;
1488 }
1489 }
1490 } else {
10556cb2 1491 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
b3b94faa
DT
1492 if (error)
1493 goto out_gunlock;
1494
dbb7cae2 1495 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
b3b94faa
DT
1496 switch (error) {
1497 case -ENOENT:
1498 error = 0;
1499 break;
1500 case 0:
1501 error = -EEXIST;
1502 default:
1503 goto out_gunlock;
098b9c14 1504 }
b3b94faa
DT
1505
1506 if (odip != ndip) {
4f56110a 1507 if (!ndip->i_inode.i_nlink) {
d192a8e5 1508 error = -ENOENT;
b3b94faa
DT
1509 goto out_gunlock;
1510 }
ad6203f2 1511 if (ndip->i_entries == (u32)-1) {
b3b94faa
DT
1512 error = -EFBIG;
1513 goto out_gunlock;
1514 }
b60623c2 1515 if (S_ISDIR(ip->i_inode.i_mode) &&
4f56110a 1516 ndip->i_inode.i_nlink == (u32)-1) {
b3b94faa
DT
1517 error = -EMLINK;
1518 goto out_gunlock;
1519 }
1520 }
1521 }
1522
1523 /* Check out the dir to be renamed */
1524
1525 if (dir_rename) {
2b0143b5 1526 error = gfs2_permission(d_inode(odentry), MAY_WRITE);
b3b94faa
DT
1527 if (error)
1528 goto out_gunlock;
1529 }
1530
3c1c0ae1
SW
1531 if (nip == NULL) {
1532 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1533 if (error)
1534 goto out_gunlock;
1535 }
b3b94faa 1536
3c1c0ae1
SW
1537 if (da.nr_blocks) {
1538 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
b8fbf471 1539 error = gfs2_quota_lock_check(ndip, &ap);
b3b94faa 1540 if (error)
5407e242 1541 goto out_gunlock;
b3b94faa 1542
7b9cff46 1543 error = gfs2_inplace_reserve(ndip, &ap);
b3b94faa
DT
1544 if (error)
1545 goto out_gunlock_q;
1546
534cf9ca
SW
1547 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1548 4 * RES_LEAF + 4, 0);
b3b94faa
DT
1549 if (error)
1550 goto out_ipreserv;
1551 } else {
1552 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
87d21e07 1553 5 * RES_LEAF + 4, 0);
b3b94faa
DT
1554 if (error)
1555 goto out_gunlock;
1556 }
1557
1558 /* Remove the target file, if it exists */
1559
4327a9bf
BP
1560 if (nip)
1561 error = gfs2_unlink_inode(ndip, ndentry);
b3b94faa 1562
a63b7bbc
BM
1563 error = update_moved_ino(ip, ndip, dir_rename);
1564 if (error)
1565 goto out_end_trans;
b3b94faa 1566
855d23ce 1567 error = gfs2_dir_del(odip, odentry);
b3b94faa
DT
1568 if (error)
1569 goto out_end_trans;
1570
2b47dad8 1571 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
b3b94faa
DT
1572 if (error)
1573 goto out_end_trans;
1574
feaa7bba 1575out_end_trans:
b3b94faa 1576 gfs2_trans_end(sdp);
feaa7bba 1577out_ipreserv:
3c1c0ae1 1578 if (da.nr_blocks)
b3b94faa 1579 gfs2_inplace_release(ndip);
feaa7bba 1580out_gunlock_q:
3c1c0ae1 1581 if (da.nr_blocks)
b3b94faa 1582 gfs2_quota_unlock(ndip);
feaa7bba 1583out_gunlock:
2b47dad8 1584 gfs2_dir_no_add(&da);
bc74aaef
BP
1585 if (gfs2_holder_initialized(&rd_gh))
1586 gfs2_glock_dq_uninit(&rd_gh);
1587
72dbf479 1588 while (x--) {
ad26967b
BP
1589 if (gfs2_holder_queued(ghs + x))
1590 gfs2_glock_dq(ghs + x);
b3b94faa 1591 gfs2_holder_uninit(ghs + x);
72dbf479 1592 }
feaa7bba 1593out_gunlock_r:
6df9f9a2 1594 if (gfs2_holder_initialized(&r_gh))
b3b94faa 1595 gfs2_glock_dq_uninit(&r_gh);
feaa7bba 1596out:
2fba46a0 1597 gfs2_qa_put(ndip);
b3b94faa
DT
1598 return error;
1599}
1600
a63b7bbc
BM
1601/**
1602 * gfs2_exchange - exchange two files
1603 * @odir: Parent directory of old file name
1604 * @odentry: The old dentry of the file
1605 * @ndir: Parent directory of new file name
1606 * @ndentry: The new dentry of the file
1607 * @flags: The rename flags
1608 *
1609 * Returns: errno
1610 */
1611
1612static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1613 struct inode *ndir, struct dentry *ndentry,
1614 unsigned int flags)
1615{
1616 struct gfs2_inode *odip = GFS2_I(odir);
1617 struct gfs2_inode *ndip = GFS2_I(ndir);
1618 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1619 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1620 struct gfs2_sbd *sdp = GFS2_SB(odir);
ad26967b 1621 struct gfs2_holder ghs[4], r_gh;
a63b7bbc
BM
1622 unsigned int num_gh;
1623 unsigned int x;
1624 umode_t old_mode = oip->i_inode.i_mode;
1625 umode_t new_mode = nip->i_inode.i_mode;
1626 int error;
1627
6df9f9a2 1628 gfs2_holder_mark_uninitialized(&r_gh);
a63b7bbc
BM
1629 error = gfs2_rindex_update(sdp);
1630 if (error)
1631 return error;
1632
1633 if (odip != ndip) {
1634 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1635 0, &r_gh);
1636 if (error)
1637 goto out;
1638
1639 if (S_ISDIR(old_mode)) {
1640 /* don't move a directory into its subdir */
1641 error = gfs2_ok_to_move(oip, ndip);
1642 if (error)
1643 goto out_gunlock_r;
1644 }
1645
1646 if (S_ISDIR(new_mode)) {
1647 /* don't move a directory into its subdir */
1648 error = gfs2_ok_to_move(nip, odip);
1649 if (error)
1650 goto out_gunlock_r;
1651 }
1652 }
1653
1654 num_gh = 1;
ad26967b 1655 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
a63b7bbc 1656 if (odip != ndip) {
ad26967b
BP
1657 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1658 ghs + num_gh);
a63b7bbc
BM
1659 num_gh++;
1660 }
ad26967b 1661 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
a63b7bbc
BM
1662 num_gh++;
1663
ad26967b 1664 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
a63b7bbc
BM
1665 num_gh++;
1666
1667 for (x = 0; x < num_gh; x++) {
1668 error = gfs2_glock_nq(ghs + x);
1669 if (error)
1670 goto out_gunlock;
1671 }
1672
ad26967b
BP
1673 error = gfs2_glock_async_wait(num_gh, ghs);
1674 if (error)
1675 goto out_gunlock;
1676
a63b7bbc
BM
1677 error = -ENOENT;
1678 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1679 goto out_gunlock;
1680
1681 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1682 if (error)
1683 goto out_gunlock;
1684 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1685 if (error)
1686 goto out_gunlock;
1687
1688 if (S_ISDIR(old_mode)) {
1689 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1690 if (error)
1691 goto out_gunlock;
1692 }
1693 if (S_ISDIR(new_mode)) {
1694 error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
1695 if (error)
1696 goto out_gunlock;
1697 }
1698 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1699 if (error)
1700 goto out_gunlock;
1701
1702 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1703 if (error)
1704 goto out_end_trans;
1705
1706 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1707 if (error)
1708 goto out_end_trans;
1709
1710 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1711 IF2DT(old_mode));
1712 if (error)
1713 goto out_end_trans;
1714
1715 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1716 IF2DT(new_mode));
1717 if (error)
1718 goto out_end_trans;
1719
1720 if (odip != ndip) {
1721 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1722 inc_nlink(&odip->i_inode);
1723 drop_nlink(&ndip->i_inode);
1724 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1725 inc_nlink(&ndip->i_inode);
1726 drop_nlink(&odip->i_inode);
1727 }
1728 }
1729 mark_inode_dirty(&ndip->i_inode);
1730 if (odip != ndip)
1731 mark_inode_dirty(&odip->i_inode);
1732
1733out_end_trans:
1734 gfs2_trans_end(sdp);
1735out_gunlock:
1736 while (x--) {
ad26967b
BP
1737 if (gfs2_holder_queued(ghs + x))
1738 gfs2_glock_dq(ghs + x);
a63b7bbc
BM
1739 gfs2_holder_uninit(ghs + x);
1740 }
1741out_gunlock_r:
6df9f9a2 1742 if (gfs2_holder_initialized(&r_gh))
a63b7bbc
BM
1743 gfs2_glock_dq_uninit(&r_gh);
1744out:
1745 return error;
1746}
1747
1748static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
1749 struct inode *ndir, struct dentry *ndentry,
1750 unsigned int flags)
1751{
1752 flags &= ~RENAME_NOREPLACE;
1753
1754 if (flags & ~RENAME_EXCHANGE)
1755 return -EINVAL;
1756
1757 if (flags & RENAME_EXCHANGE)
1758 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1759
1760 return gfs2_rename(odir, odentry, ndir, ndentry);
1761}
1762
536baf02 1763/**
6b255391 1764 * gfs2_get_link - Follow a symbolic link
c177c2ac 1765 * @dentry: The dentry of the link
6b255391 1766 * @inode: The inode of the link
fceef393 1767 * @done: destructor for return value
536baf02 1768 *
c177c2ac 1769 * This can handle symlinks of any size.
536baf02 1770 *
c177c2ac 1771 * Returns: 0 on success or error code
536baf02
SW
1772 */
1773
6b255391 1774static const char *gfs2_get_link(struct dentry *dentry,
fceef393
AV
1775 struct inode *inode,
1776 struct delayed_call *done)
536baf02 1777{
6b255391 1778 struct gfs2_inode *ip = GFS2_I(inode);
536baf02
SW
1779 struct gfs2_holder i_gh;
1780 struct buffer_head *dibh;
160b4026 1781 unsigned int size;
c177c2ac 1782 char *buf;
536baf02
SW
1783 int error;
1784
6b255391
AV
1785 if (!dentry)
1786 return ERR_PTR(-ECHILD);
1787
536baf02
SW
1788 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1789 error = gfs2_glock_nq(&i_gh);
1790 if (error) {
1791 gfs2_holder_uninit(&i_gh);
680baacb 1792 return ERR_PTR(error);
536baf02
SW
1793 }
1794
a2e0f799
SW
1795 size = (unsigned int)i_size_read(&ip->i_inode);
1796 if (size == 0) {
536baf02 1797 gfs2_consist_inode(ip);
c177c2ac 1798 buf = ERR_PTR(-EIO);
536baf02
SW
1799 goto out;
1800 }
1801
1802 error = gfs2_meta_inode_buffer(ip, &dibh);
c177c2ac
AV
1803 if (error) {
1804 buf = ERR_PTR(error);
536baf02 1805 goto out;
536baf02
SW
1806 }
1807
160b4026 1808 buf = kzalloc(size + 1, GFP_NOFS);
c177c2ac
AV
1809 if (!buf)
1810 buf = ERR_PTR(-ENOMEM);
1811 else
160b4026 1812 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
536baf02
SW
1813 brelse(dibh);
1814out:
1815 gfs2_glock_dq_uninit(&i_gh);
680baacb 1816 if (!IS_ERR(buf))
fceef393 1817 set_delayed_call(done, kfree_link, buf);
680baacb 1818 return buf;
b3b94faa
DT
1819}
1820
b3b94faa
DT
1821/**
1822 * gfs2_permission -
75d5cfbe
SW
1823 * @inode: The inode
1824 * @mask: The mask to be tested
1825 * @flags: Indicates whether this is an RCU path walk or not
b3b94faa 1826 *
300c7d75
SW
1827 * This may be called from the VFS directly, or from within GFS2 with the
1828 * inode locked, so we look to see if the glock is already locked and only
1829 * lock the glock if its not already been done.
1830 *
b3b94faa
DT
1831 * Returns: errno
1832 */
1833
10556cb2 1834int gfs2_permission(struct inode *inode, int mask)
b3b94faa 1835{
b74c79e9 1836 struct gfs2_inode *ip;
b3b94faa
DT
1837 struct gfs2_holder i_gh;
1838 int error;
b74c79e9 1839
6df9f9a2 1840 gfs2_holder_mark_uninitialized(&i_gh);
b74c79e9 1841 ip = GFS2_I(inode);
7afd88d9 1842 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2e60d768
BM
1843 if (mask & MAY_NOT_BLOCK)
1844 return -ECHILD;
1845 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1846 if (error)
1847 return error;
300c7d75 1848 }
b3b94faa 1849
f58ba889 1850 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
337684a1 1851 error = -EPERM;
f58ba889 1852 else
2830ba7f 1853 error = generic_permission(inode, mask);
6df9f9a2 1854 if (gfs2_holder_initialized(&i_gh))
b3b94faa 1855 gfs2_glock_dq_uninit(&i_gh);
b3b94faa
DT
1856
1857 return error;
1858}
1859
ab9bbda0 1860static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
194c011f 1861{
194c011f
SW
1862 setattr_copy(inode, attr);
1863 mark_inode_dirty(inode);
194c011f
SW
1864 return 0;
1865}
1866
1867/**
1868 * gfs2_setattr_simple -
1869 * @ip:
1870 * @attr:
1871 *
1872 * Returns: errno
1873 */
1874
ab9bbda0 1875int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
194c011f
SW
1876{
1877 int error;
1878
1879 if (current->journal_info)
ab9bbda0 1880 return __gfs2_setattr_simple(inode, attr);
194c011f 1881
ab9bbda0 1882 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
194c011f
SW
1883 if (error)
1884 return error;
1885
ab9bbda0
SW
1886 error = __gfs2_setattr_simple(inode, attr);
1887 gfs2_trans_end(GFS2_SB(inode));
194c011f
SW
1888 return error;
1889}
1890
b3b94faa
DT
1891static int setattr_chown(struct inode *inode, struct iattr *attr)
1892{
feaa7bba
SW
1893 struct gfs2_inode *ip = GFS2_I(inode);
1894 struct gfs2_sbd *sdp = GFS2_SB(inode);
7c06b5d6
EB
1895 kuid_t ouid, nuid;
1896 kgid_t ogid, ngid;
b3b94faa 1897 int error;
b8fbf471 1898 struct gfs2_alloc_parms ap;
b3b94faa 1899
2933f925
SW
1900 ouid = inode->i_uid;
1901 ogid = inode->i_gid;
b3b94faa
DT
1902 nuid = attr->ia_uid;
1903 ngid = attr->ia_gid;
1904
6b24c0d2 1905 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
f4108a60 1906 ouid = nuid = NO_UID_QUOTA_CHANGE;
6b24c0d2 1907 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
f4108a60 1908 ogid = ngid = NO_GID_QUOTA_CHANGE;
2fba46a0 1909 error = gfs2_qa_get(ip);
62e96cf8 1910 if (error)
2fba46a0 1911 return error;
62e96cf8
BP
1912
1913 error = gfs2_rindex_update(sdp);
1914 if (error)
1915 goto out;
1916
1917 error = gfs2_quota_lock(ip, nuid, ngid);
1918 if (error)
1919 goto out;
1920
b8fbf471
AD
1921 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1922
6b24c0d2
EB
1923 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1924 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
b8fbf471 1925 error = gfs2_quota_check(ip, nuid, ngid, &ap);
b3b94faa
DT
1926 if (error)
1927 goto out_gunlock_q;
1928 }
1929
1930 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1931 if (error)
1932 goto out_gunlock_q;
1933
ab9bbda0 1934 error = gfs2_setattr_simple(inode, attr);
b3b94faa
DT
1935 if (error)
1936 goto out_end_trans;
1937
6b24c0d2
EB
1938 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1939 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
39a72580 1940 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
b8fbf471 1941 gfs2_quota_change(ip, ap.target, nuid, ngid);
b3b94faa
DT
1942 }
1943
a91ea69f 1944out_end_trans:
b3b94faa 1945 gfs2_trans_end(sdp);
a91ea69f 1946out_gunlock_q:
b3b94faa 1947 gfs2_quota_unlock(ip);
62e96cf8 1948out:
2fba46a0 1949 gfs2_qa_put(ip);
b3b94faa
DT
1950 return error;
1951}
1952
1953/**
1954 * gfs2_setattr - Change attributes on an inode
1955 * @dentry: The dentry which is changing
1956 * @attr: The structure describing the change
1957 *
1958 * The VFS layer wants to change one or more of an inodes attributes. Write
1959 * that change out to disk.
1960 *
1961 * Returns: errno
1962 */
1963
1964static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1965{
2b0143b5 1966 struct inode *inode = d_inode(dentry);
feaa7bba 1967 struct gfs2_inode *ip = GFS2_I(inode);
b3b94faa
DT
1968 struct gfs2_holder i_gh;
1969 int error;
1970
2fba46a0 1971 error = gfs2_qa_get(ip);
0a305e49
BP
1972 if (error)
1973 return error;
1974
b3b94faa
DT
1975 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1976 if (error)
2fba46a0 1977 goto out;
b3b94faa
DT
1978
1979 error = -EPERM;
1980 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
2fba46a0 1981 goto error;
b3b94faa 1982
31051c85 1983 error = setattr_prepare(dentry, attr);
b3b94faa 1984 if (error)
2fba46a0 1985 goto error;
b3b94faa
DT
1986
1987 if (attr->ia_valid & ATTR_SIZE)
ff8f33c8 1988 error = gfs2_setattr_size(inode, attr->ia_size);
b3b94faa
DT
1989 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1990 error = setattr_chown(inode, attr);
e01580bf 1991 else {
ab9bbda0 1992 error = gfs2_setattr_simple(inode, attr);
e01580bf
CH
1993 if (!error && attr->ia_valid & ATTR_MODE)
1994 error = posix_acl_chmod(inode, inode->i_mode);
1995 }
b3b94faa 1996
2fba46a0 1997error:
b3b94faa
DT
1998 if (!error)
1999 mark_inode_dirty(inode);
ab9bbda0 2000 gfs2_glock_dq_uninit(&i_gh);
2fba46a0
BP
2001out:
2002 gfs2_qa_put(ip);
b3b94faa
DT
2003 return error;
2004}
2005
2006/**
2007 * gfs2_getattr - Read out an inode's attributes
a528d35e 2008 * @path: Object to query
b3b94faa 2009 * @stat: The inode's stats
a528d35e
DH
2010 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
2011 * @flags: AT_STATX_xxx setting
b3b94faa 2012 *
dcf3dd85
SW
2013 * This may be called from the VFS directly, or from within GFS2 with the
2014 * inode locked, so we look to see if the glock is already locked and only
2015 * lock the glock if its not already been done. Note that its the NFS
2016 * readdirplus operation which causes this to be called (from filldir)
2017 * with the glock already held.
2018 *
b3b94faa
DT
2019 * Returns: errno
2020 */
2021
a528d35e
DH
2022static int gfs2_getattr(const struct path *path, struct kstat *stat,
2023 u32 request_mask, unsigned int flags)
b3b94faa 2024{
a528d35e 2025 struct inode *inode = d_inode(path->dentry);
feaa7bba 2026 struct gfs2_inode *ip = GFS2_I(inode);
b3b94faa 2027 struct gfs2_holder gh;
b2623c2f 2028 u32 gfsflags;
b3b94faa
DT
2029 int error;
2030
6df9f9a2 2031 gfs2_holder_mark_uninitialized(&gh);
7afd88d9 2032 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2e60d768
BM
2033 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2034 if (error)
2035 return error;
b3b94faa
DT
2036 }
2037
b2623c2f
AG
2038 gfsflags = ip->i_diskflags;
2039 if (gfsflags & GFS2_DIF_APPENDONLY)
2040 stat->attributes |= STATX_ATTR_APPEND;
2041 if (gfsflags & GFS2_DIF_IMMUTABLE)
2042 stat->attributes |= STATX_ATTR_IMMUTABLE;
2043
2044 stat->attributes_mask |= (STATX_ATTR_APPEND |
2045 STATX_ATTR_COMPRESSED |
2046 STATX_ATTR_ENCRYPTED |
2047 STATX_ATTR_IMMUTABLE |
2048 STATX_ATTR_NODUMP);
2049
dcf3dd85 2050 generic_fillattr(inode, stat);
b2623c2f 2051
6df9f9a2 2052 if (gfs2_holder_initialized(&gh))
dcf3dd85
SW
2053 gfs2_glock_dq_uninit(&gh);
2054
2055 return 0;
b3b94faa
DT
2056}
2057
e9079cce
SW
2058static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2059 u64 start, u64 len)
2060{
2061 struct gfs2_inode *ip = GFS2_I(inode);
2062 struct gfs2_holder gh;
2063 int ret;
2064
aac1a55b 2065 inode_lock_shared(inode);
e9079cce
SW
2066
2067 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2068 if (ret)
2069 goto out;
2070
aac1a55b 2071 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
e9079cce
SW
2072
2073 gfs2_glock_dq_uninit(&gh);
aac1a55b 2074
e9079cce 2075out:
aac1a55b 2076 inode_unlock_shared(inode);
e9079cce
SW
2077 return ret;
2078}
2079
3a27411c
AG
2080loff_t gfs2_seek_data(struct file *file, loff_t offset)
2081{
2082 struct inode *inode = file->f_mapping->host;
2083 struct gfs2_inode *ip = GFS2_I(inode);
2084 struct gfs2_holder gh;
2085 loff_t ret;
2086
2087 inode_lock_shared(inode);
2088 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2089 if (!ret)
2090 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2091 gfs2_glock_dq_uninit(&gh);
2092 inode_unlock_shared(inode);
2093
2094 if (ret < 0)
2095 return ret;
2096 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2097}
2098
2099loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2100{
2101 struct inode *inode = file->f_mapping->host;
2102 struct gfs2_inode *ip = GFS2_I(inode);
2103 struct gfs2_holder gh;
2104 loff_t ret;
2105
2106 inode_lock_shared(inode);
2107 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2108 if (!ret)
2109 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2110 gfs2_glock_dq_uninit(&gh);
2111 inode_unlock_shared(inode);
2112
2113 if (ret < 0)
2114 return ret;
2115 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2116}
2117
92e1d5be 2118const struct inode_operations gfs2_file_iops = {
e6305c43 2119 .permission = gfs2_permission,
b3b94faa
DT
2120 .setattr = gfs2_setattr,
2121 .getattr = gfs2_getattr,
b3b94faa 2122 .listxattr = gfs2_listxattr,
e9079cce 2123 .fiemap = gfs2_fiemap,
4e34e719 2124 .get_acl = gfs2_get_acl,
e01580bf 2125 .set_acl = gfs2_set_acl,
b3b94faa
DT
2126};
2127
92e1d5be 2128const struct inode_operations gfs2_dir_iops = {
b3b94faa
DT
2129 .create = gfs2_create,
2130 .lookup = gfs2_lookup,
2131 .link = gfs2_link,
2132 .unlink = gfs2_unlink,
2133 .symlink = gfs2_symlink,
2134 .mkdir = gfs2_mkdir,
855d23ce 2135 .rmdir = gfs2_unlink,
b3b94faa 2136 .mknod = gfs2_mknod,
2773bf00 2137 .rename = gfs2_rename2,
e6305c43 2138 .permission = gfs2_permission,
b3b94faa
DT
2139 .setattr = gfs2_setattr,
2140 .getattr = gfs2_getattr,
b3b94faa 2141 .listxattr = gfs2_listxattr,
e9079cce 2142 .fiemap = gfs2_fiemap,
4e34e719 2143 .get_acl = gfs2_get_acl,
e01580bf 2144 .set_acl = gfs2_set_acl,
6d4ade98 2145 .atomic_open = gfs2_atomic_open,
b3b94faa
DT
2146};
2147
92e1d5be 2148const struct inode_operations gfs2_symlink_iops = {
6b255391 2149 .get_link = gfs2_get_link,
e6305c43 2150 .permission = gfs2_permission,
b3b94faa
DT
2151 .setattr = gfs2_setattr,
2152 .getattr = gfs2_getattr,
b3b94faa 2153 .listxattr = gfs2_listxattr,
e9079cce 2154 .fiemap = gfs2_fiemap,
b3b94faa
DT
2155};
2156