blob: 063fdfcf82758a0c77f4cc44fe7b1f873b3cbb21 [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Steven Whitehousef2741d92011-05-13 12:11:17 +01003 * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
9
David Teiglandb3b94fa2006-01-16 16:50:04 +000010#include <linux/slab.h>
11#include <linux/spinlock.h>
12#include <linux/completion.h>
13#include <linux/buffer_head.h>
14#include <linux/namei.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000015#include <linux/mm.h>
16#include <linux/xattr.h>
17#include <linux/posix_acl.h>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050018#include <linux/gfs2_ondisk.h>
Steven Whitehouse71b86f52006-03-28 14:14:04 -050019#include <linux/crc32.h>
Steven Whitehousee9079cc2008-10-14 14:43:29 +010020#include <linux/fiemap.h>
Steven Whitehouse194c0112011-05-09 14:06:38 +010021#include <linux/security.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000022#include <asm/uaccess.h>
23
24#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050025#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000026#include "acl.h"
27#include "bmap.h"
28#include "dir.h"
Steven Whitehouse307cf6e2009-08-26 18:51:04 +010029#include "xattr.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000030#include "glock.h"
31#include "inode.h"
32#include "meta_io.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000033#include "quota.h"
34#include "rgrp.h"
35#include "trans.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050036#include "util.h"
Steven Whitehouseb2760582008-10-14 16:05:55 +010037#include "super.h"
Steven Whitehouse194c0112011-05-09 14:06:38 +010038#include "glops.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000039
Steven Whitehouse194c0112011-05-09 14:06:38 +010040struct gfs2_skip_data {
41 u64 no_addr;
42 int skipped;
43 int non_block;
44};
45
46static int iget_test(struct inode *inode, void *opaque)
47{
48 struct gfs2_inode *ip = GFS2_I(inode);
49 struct gfs2_skip_data *data = opaque;
50
51 if (ip->i_no_addr == data->no_addr) {
52 if (data->non_block &&
53 inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
54 data->skipped = 1;
55 return 0;
56 }
57 return 1;
58 }
59 return 0;
60}
61
62static int iget_set(struct inode *inode, void *opaque)
63{
64 struct gfs2_inode *ip = GFS2_I(inode);
65 struct gfs2_skip_data *data = opaque;
66
67 if (data->skipped)
68 return -ENOENT;
69 inode->i_ino = (unsigned long)(data->no_addr);
70 ip->i_no_addr = data->no_addr;
71 return 0;
72}
73
74struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block)
75{
76 unsigned long hash = (unsigned long)no_addr;
77 struct gfs2_skip_data data;
78
79 data.no_addr = no_addr;
80 data.skipped = 0;
81 data.non_block = non_block;
82 return ilookup5(sb, hash, iget_test, &data);
83}
84
85static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr,
86 int non_block)
87{
88 struct gfs2_skip_data data;
89 unsigned long hash = (unsigned long)no_addr;
90
91 data.no_addr = no_addr;
92 data.skipped = 0;
93 data.non_block = non_block;
94 return iget5_locked(sb, hash, iget_test, iget_set, &data);
95}
96
97/**
98 * gfs2_set_iop - Sets inode operations
99 * @inode: The inode with correct i_mode filled in
100 *
101 * GFS2 lookup code fills in vfs inode contents based on info obtained
102 * from directory entry inside gfs2_inode_lookup().
103 */
104
105static void gfs2_set_iop(struct inode *inode)
106{
107 struct gfs2_sbd *sdp = GFS2_SB(inode);
108 umode_t mode = inode->i_mode;
109
110 if (S_ISREG(mode)) {
111 inode->i_op = &gfs2_file_iops;
112 if (gfs2_localflocks(sdp))
113 inode->i_fop = &gfs2_file_fops_nolock;
114 else
115 inode->i_fop = &gfs2_file_fops;
116 } else if (S_ISDIR(mode)) {
117 inode->i_op = &gfs2_dir_iops;
118 if (gfs2_localflocks(sdp))
119 inode->i_fop = &gfs2_dir_fops_nolock;
120 else
121 inode->i_fop = &gfs2_dir_fops;
122 } else if (S_ISLNK(mode)) {
123 inode->i_op = &gfs2_symlink_iops;
124 } else {
125 inode->i_op = &gfs2_file_iops;
126 init_special_inode(inode, inode->i_mode, inode->i_rdev);
127 }
128}
129
130/**
131 * gfs2_inode_lookup - Lookup an inode
132 * @sb: The super block
133 * @no_addr: The inode number
134 * @type: The type of the inode
135 * non_block: Can we block on inodes that are being freed?
136 *
137 * Returns: A VFS inode, or an error
138 */
139
140struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
141 u64 no_addr, u64 no_formal_ino, int non_block)
142{
143 struct inode *inode;
144 struct gfs2_inode *ip;
145 struct gfs2_glock *io_gl = NULL;
146 int error;
147
148 inode = gfs2_iget(sb, no_addr, non_block);
149 ip = GFS2_I(inode);
150
151 if (!inode)
Steven Whitehouseac3beb62014-01-16 10:31:13 +0000152 return ERR_PTR(-ENOMEM);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100153
154 if (inode->i_state & I_NEW) {
155 struct gfs2_sbd *sdp = GFS2_SB(inode);
156 ip->i_no_formal_ino = no_formal_ino;
157
158 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
159 if (unlikely(error))
160 goto fail;
161 ip->i_gl->gl_object = ip;
162
163 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
164 if (unlikely(error))
165 goto fail_put;
166
167 set_bit(GIF_INVALID, &ip->i_flags);
168 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
169 if (unlikely(error))
170 goto fail_iopen;
171
172 ip->i_iopen_gh.gh_gl->gl_object = ip;
173 gfs2_glock_put(io_gl);
174 io_gl = NULL;
175
176 if (type == DT_UNKNOWN) {
177 /* Inode glock must be locked already */
178 error = gfs2_inode_refresh(GFS2_I(inode));
179 if (error)
180 goto fail_refresh;
181 } else {
182 inode->i_mode = DT2IF(type);
183 }
184
185 gfs2_set_iop(inode);
186 unlock_new_inode(inode);
187 }
188
189 return inode;
190
191fail_refresh:
Bob Petersona6a4d982013-05-29 11:51:52 -0400192 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100193 ip->i_iopen_gh.gh_gl->gl_object = NULL;
194 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
195fail_iopen:
196 if (io_gl)
197 gfs2_glock_put(io_gl);
198fail_put:
199 ip->i_gl->gl_object = NULL;
200 gfs2_glock_put(ip->i_gl);
201fail:
202 iget_failed(inode);
203 return ERR_PTR(error);
204}
205
206struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
207 u64 *no_formal_ino, unsigned int blktype)
208{
209 struct super_block *sb = sdp->sd_vfs;
210 struct gfs2_holder i_gh;
211 struct inode *inode = NULL;
212 int error;
213
214 /* Must not read in block until block type is verified */
215 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
216 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
217 if (error)
218 return ERR_PTR(error);
219
220 error = gfs2_check_blk_type(sdp, no_addr, blktype);
221 if (error)
222 goto fail;
223
224 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1);
225 if (IS_ERR(inode))
226 goto fail;
227
228 /* Two extra checks for NFS only */
229 if (no_formal_ino) {
230 error = -ESTALE;
231 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
232 goto fail_iput;
233
234 error = -EIO;
235 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
236 goto fail_iput;
237
238 error = 0;
239 }
240
241fail:
242 gfs2_glock_dq_uninit(&i_gh);
243 return error ? ERR_PTR(error) : inode;
244fail_iput:
245 iput(inode);
246 goto fail;
247}
248
249
250struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
251{
252 struct qstr qstr;
253 struct inode *inode;
254 gfs2_str2qstr(&qstr, name);
255 inode = gfs2_lookupi(dip, &qstr, 1);
256 /* gfs2_lookupi has inconsistent callers: vfs
257 * related routines expect NULL for no entry found,
258 * gfs2_lookup_simple callers expect ENOENT
259 * and do not check for NULL.
260 */
261 if (inode == NULL)
262 return ERR_PTR(-ENOENT);
263 else
264 return inode;
265}
266
267
268/**
269 * gfs2_lookupi - Look up a filename in a directory and return its inode
270 * @d_gh: An initialized holder for the directory glock
271 * @name: The name of the inode to look for
272 * @is_root: If 1, ignore the caller's permissions
273 * @i_gh: An uninitialized holder for the new inode glock
274 *
275 * This can be called via the VFS filldir function when NFS is doing
276 * a readdirplus and the inode which its intending to stat isn't
277 * already in cache. In this case we must not take the directory glock
278 * again, since the readdir call will have already taken that lock.
279 *
280 * Returns: errno
281 */
282
283struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
284 int is_root)
285{
286 struct super_block *sb = dir->i_sb;
287 struct gfs2_inode *dip = GFS2_I(dir);
288 struct gfs2_holder d_gh;
289 int error = 0;
290 struct inode *inode = NULL;
291 int unlock = 0;
292
293 if (!name->len || name->len > GFS2_FNAMESIZE)
294 return ERR_PTR(-ENAMETOOLONG);
295
296 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
297 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
David Howells2b0143b2015-03-17 22:25:59 +0000298 dir == d_inode(sb->s_root))) {
Steven Whitehouse194c0112011-05-09 14:06:38 +0100299 igrab(dir);
300 return dir;
301 }
302
303 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
304 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
305 if (error)
306 return ERR_PTR(error);
307 unlock = 1;
308 }
309
310 if (!is_root) {
Al Viro10556cb2011-06-20 19:28:19 -0400311 error = gfs2_permission(dir, MAY_EXEC);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100312 if (error)
313 goto out;
314 }
315
Steven Whitehouse5a00f3c2013-06-11 13:45:29 +0100316 inode = gfs2_dir_search(dir, name, false);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100317 if (IS_ERR(inode))
318 error = PTR_ERR(inode);
319out:
320 if (unlock)
321 gfs2_glock_dq_uninit(&d_gh);
322 if (error == -ENOENT)
323 return NULL;
324 return inode ? inode : ERR_PTR(error);
325}
326
327/**
328 * create_ok - OK to create a new on-disk inode here?
329 * @dip: Directory in which dinode is to be created
330 * @name: Name of new dinode
331 * @mode:
332 *
333 * Returns: errno
334 */
335
336static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
Al Viro175a4eb2011-07-26 03:30:54 -0400337 umode_t mode)
Steven Whitehouse194c0112011-05-09 14:06:38 +0100338{
339 int error;
340
Al Viro10556cb2011-06-20 19:28:19 -0400341 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100342 if (error)
343 return error;
344
345 /* Don't create entries in an unlinked directory */
346 if (!dip->i_inode.i_nlink)
347 return -ENOENT;
348
Steven Whitehouse194c0112011-05-09 14:06:38 +0100349 if (dip->i_entries == (u32)-1)
350 return -EFBIG;
351 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
352 return -EMLINK;
353
354 return 0;
355}
356
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000357static void munge_mode_uid_gid(const struct gfs2_inode *dip,
358 struct inode *inode)
Steven Whitehouse194c0112011-05-09 14:06:38 +0100359{
360 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
Eric W. Biederman6b24c0d2013-01-31 21:56:13 -0800361 (dip->i_inode.i_mode & S_ISUID) &&
362 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000363 if (S_ISDIR(inode->i_mode))
364 inode->i_mode |= S_ISUID;
Eric W. Biederman6b24c0d2013-01-31 21:56:13 -0800365 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000366 inode->i_mode &= ~07111;
367 inode->i_uid = dip->i_inode.i_uid;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100368 } else
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000369 inode->i_uid = current_fsuid();
Steven Whitehouse194c0112011-05-09 14:06:38 +0100370
371 if (dip->i_inode.i_mode & S_ISGID) {
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000372 if (S_ISDIR(inode->i_mode))
373 inode->i_mode |= S_ISGID;
374 inode->i_gid = dip->i_inode.i_gid;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100375 } else
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000376 inode->i_gid = current_fsgid();
Steven Whitehouse194c0112011-05-09 14:06:38 +0100377}
378
Steven Whitehouseb2c8b3e2014-02-04 15:45:11 +0000379static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
Steven Whitehouse194c0112011-05-09 14:06:38 +0100380{
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000381 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehouseb2c8b3e2014-02-04 15:45:11 +0000382 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
Steven Whitehouse194c0112011-05-09 14:06:38 +0100383 int error;
384
Abhi Dasb8fbf472015-03-18 12:03:41 -0500385 error = gfs2_quota_lock_check(ip, &ap);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100386 if (error)
387 goto out;
388
Steven Whitehouse7b9cff42013-10-02 11:13:25 +0100389 error = gfs2_inplace_reserve(ip, &ap);
Steven Whitehousefd4b4e02013-02-26 16:15:20 +0000390 if (error)
391 goto out_quota;
392
Steven Whitehouseb2c8b3e2014-02-04 15:45:11 +0000393 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100394 if (error)
395 goto out_ipreserv;
396
Steven Whitehouseb2c8b3e2014-02-04 15:45:11 +0000397 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000398 ip->i_no_formal_ino = ip->i_generation;
399 ip->i_inode.i_ino = ip->i_no_addr;
400 ip->i_goal = ip->i_no_addr;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100401
402 gfs2_trans_end(sdp);
403
404out_ipreserv:
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000405 gfs2_inplace_release(ip);
Steven Whitehousefd4b4e02013-02-26 16:15:20 +0000406out_quota:
407 gfs2_quota_unlock(ip);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100408out:
Steven Whitehouse194c0112011-05-09 14:06:38 +0100409 return error;
410}
411
Steven Whitehousef2741d92011-05-13 12:11:17 +0100412static void gfs2_init_dir(struct buffer_head *dibh,
413 const struct gfs2_inode *parent)
Steven Whitehousee2d0a132011-05-13 09:55:55 +0100414{
415 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
416 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
417
418 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
419 dent->de_inum = di->di_num; /* already GFS2 endian */
420 dent->de_type = cpu_to_be16(DT_DIR);
421
422 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
423 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
424 gfs2_inum_out(parent, dent);
425 dent->de_type = cpu_to_be16(DT_DIR);
426
427}
428
Steven Whitehouse194c0112011-05-09 14:06:38 +0100429/**
Steven Whitehouseb2c8b3e2014-02-04 15:45:11 +0000430 * gfs2_init_xattr - Initialise an xattr block for a new inode
431 * @ip: The inode in question
432 *
433 * This sets up an empty xattr block for a new inode, ready to
434 * take any ACLs, LSM xattrs, etc.
435 */
436
437static void gfs2_init_xattr(struct gfs2_inode *ip)
438{
439 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
440 struct buffer_head *bh;
441 struct gfs2_ea_header *ea;
442
443 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
444 gfs2_trans_add_meta(ip->i_gl, bh);
445 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
446 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
447
448 ea = GFS2_EA_BH2FIRST(bh);
449 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
450 ea->ea_type = GFS2_EATYPE_UNUSED;
451 ea->ea_flags = GFS2_EAFLAG_LAST;
452
453 brelse(bh);
454}
455
456/**
Steven Whitehouse194c0112011-05-09 14:06:38 +0100457 * init_dinode - Fill in a new dinode structure
Steven Whitehousef2741d92011-05-13 12:11:17 +0100458 * @dip: The directory this inode is being created in
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000459 * @ip: The inode
Steven Whitehousef2741d92011-05-13 12:11:17 +0100460 * @symname: The symlink destination (if a symlink)
Steven Whitehousef2741d92011-05-13 12:11:17 +0100461 * @bhp: The buffer head (returned to caller)
Steven Whitehouse194c0112011-05-09 14:06:38 +0100462 *
463 */
464
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000465static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
Steven Whitehouse79ba7482013-03-01 09:29:12 +0000466 const char *symname)
Steven Whitehouse194c0112011-05-09 14:06:38 +0100467{
Steven Whitehouse194c0112011-05-09 14:06:38 +0100468 struct gfs2_dinode *di;
469 struct buffer_head *dibh;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100470
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000471 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000472 gfs2_trans_add_meta(ip->i_gl, dibh);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100473 di = (struct gfs2_dinode *)dibh->b_data;
Steven Whitehouse79ba7482013-03-01 09:29:12 +0000474 gfs2_dinode_out(ip, di);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100475
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000476 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
477 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
Steven Whitehouse194c0112011-05-09 14:06:38 +0100478 di->__pad1 = 0;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100479 di->__pad2 = 0;
480 di->__pad3 = 0;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100481 memset(&di->__pad4, 0, sizeof(di->__pad4));
Steven Whitehouse194c0112011-05-09 14:06:38 +0100482 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
Steven Whitehouse79ba7482013-03-01 09:29:12 +0000483 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
Steven Whitehouse160b4022011-05-13 10:34:59 +0100484
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000485 switch(ip->i_inode.i_mode & S_IFMT) {
Steven Whitehouse160b4022011-05-13 10:34:59 +0100486 case S_IFDIR:
Steven Whitehousee2d0a132011-05-13 09:55:55 +0100487 gfs2_init_dir(dibh, dip);
Steven Whitehouse160b4022011-05-13 10:34:59 +0100488 break;
489 case S_IFLNK:
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000490 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
Steven Whitehouse160b4022011-05-13 10:34:59 +0100491 break;
Steven Whitehousee2d0a132011-05-13 09:55:55 +0100492 }
493
Steven Whitehouse194c0112011-05-09 14:06:38 +0100494 set_buffer_uptodate(dibh);
Steven Whitehouse79ba7482013-03-01 09:29:12 +0000495 brelse(dibh);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100496}
497
Steven Whitehouse534cf9c2014-01-06 12:03:05 +0000498/**
499 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
500 * @dip: The directory we are linking into
501 * @da: The dir add information
502 * @nr_inodes: The number of inodes involved
503 *
504 * This calculate the number of blocks we need to reserve in a
505 * transaction to link @nr_inodes into a directory. In most cases
506 * @nr_inodes will be 2 (the directory plus the inode being linked in)
507 * but in case of rename, 4 may be required.
508 *
509 * Returns: Number of blocks
510 */
511
512static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
513 const struct gfs2_diradd *da,
514 unsigned nr_inodes)
515{
516 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
517 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
518}
519
Steven Whitehouse194c0112011-05-09 14:06:38 +0100520static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +0000521 struct gfs2_inode *ip, struct gfs2_diradd *da)
Steven Whitehouse194c0112011-05-09 14:06:38 +0100522{
523 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +0000524 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
Steven Whitehouse194c0112011-05-09 14:06:38 +0100525 int error;
526
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +0000527 if (da->nr_blocks) {
Abhi Dasb8fbf472015-03-18 12:03:41 -0500528 error = gfs2_quota_lock_check(dip, &ap);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100529 if (error)
530 goto fail_quota_locks;
531
Steven Whitehouse7b9cff42013-10-02 11:13:25 +0100532 error = gfs2_inplace_reserve(dip, &ap);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100533 if (error)
534 goto fail_quota_locks;
535
Steven Whitehouse534cf9c2014-01-06 12:03:05 +0000536 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100537 if (error)
538 goto fail_ipreserv;
539 } else {
540 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
541 if (error)
542 goto fail_quota_locks;
543 }
544
Steven Whitehouse2b47dad2014-01-06 12:49:43 +0000545 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100546
Steven Whitehouse194c0112011-05-09 14:06:38 +0100547 gfs2_trans_end(sdp);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100548fail_ipreserv:
Steven Whitehousefd4b4e02013-02-26 16:15:20 +0000549 gfs2_inplace_release(dip);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100550fail_quota_locks:
551 gfs2_quota_unlock(dip);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100552 return error;
553}
554
H Hartley Sweeten46cc1e52011-09-23 15:51:32 -0700555static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
Mimi Zohar9d8f13b2011-06-06 15:29:25 -0400556 void *fs_info)
557{
558 const struct xattr *xattr;
559 int err = 0;
560
561 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
562 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
563 xattr->value_len, 0,
564 GFS2_EATYPE_SECURITY);
565 if (err < 0)
566 break;
567 }
568 return err;
569}
570
Steven Whitehouse194c0112011-05-09 14:06:38 +0100571/**
Steven Whitehousef2741d92011-05-13 12:11:17 +0100572 * gfs2_create_inode - Create a new inode
573 * @dir: The parent directory
574 * @dentry: The new dentry
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100575 * @file: If non-NULL, the file which is being opened
Steven Whitehousef2741d92011-05-13 12:11:17 +0100576 * @mode: The permissions on the new inode
577 * @dev: For device nodes, this is the device number
578 * @symname: For symlinks, this is the link destination
579 * @size: The initial size of the inode (ignored for directories)
Steven Whitehouse194c0112011-05-09 14:06:38 +0100580 *
Steven Whitehousef2741d92011-05-13 12:11:17 +0100581 * Returns: 0 on success, or error code
Steven Whitehouse194c0112011-05-09 14:06:38 +0100582 */
583
Steven Whitehousef2741d92011-05-13 12:11:17 +0100584static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100585 struct file *file,
Al Viro175a4eb2011-07-26 03:30:54 -0400586 umode_t mode, dev_t dev, const char *symname,
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100587 unsigned int size, int excl, int *opened)
Steven Whitehouse194c0112011-05-09 14:06:38 +0100588{
Steven Whitehousef2741d92011-05-13 12:11:17 +0100589 const struct qstr *name = &dentry->d_name;
Christoph Hellwige01580b2013-12-20 05:16:52 -0800590 struct posix_acl *default_acl, *acl;
Steven Whitehousef2741d92011-05-13 12:11:17 +0100591 struct gfs2_holder ghs[2];
Steven Whitehouse194c0112011-05-09 14:06:38 +0100592 struct inode *inode = NULL;
Bob Peterson8e2e0042012-07-19 08:12:40 -0400593 struct gfs2_inode *dip = GFS2_I(dir), *ip;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100594 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000595 struct gfs2_glock *io_gl;
Abhi Das05978802014-03-31 10:33:17 -0500596 int error, free_vfs_inode = 0;
Steven Whitehouse9dbe9612012-10-31 10:37:10 +0000597 u32 aflags = 0;
Steven Whitehouseb2c8b3e2014-02-04 15:45:11 +0000598 unsigned blocks = 1;
Bob Peterson19aeb5a2014-09-29 08:52:04 -0400599 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
Steven Whitehouse194c0112011-05-09 14:06:38 +0100600
601 if (!name->len || name->len > GFS2_FNAMESIZE)
Steven Whitehousef2741d92011-05-13 12:11:17 +0100602 return -ENAMETOOLONG;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100603
Bob Peterson0a305e42012-06-06 11:17:59 +0100604 error = gfs2_rs_alloc(dip);
605 if (error)
606 return error;
607
Steven Whitehousefd4b4e02013-02-26 16:15:20 +0000608 error = gfs2_rindex_update(sdp);
609 if (error)
610 return error;
611
Steven Whitehousef2741d92011-05-13 12:11:17 +0100612 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100613 if (error)
614 goto fail;
615
616 error = create_ok(dip, name, mode);
617 if (error)
618 goto fail_gunlock;
619
Steven Whitehouse5a00f3c2013-06-11 13:45:29 +0100620 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
621 error = PTR_ERR(inode);
622 if (!IS_ERR(inode)) {
Al Viro571a4b52014-11-19 19:34:49 +0000623 if (S_ISDIR(inode->i_mode)) {
624 iput(inode);
625 inode = ERR_PTR(-EISDIR);
626 goto fail_gunlock;
627 }
Al Viro44bb31b2014-11-19 19:35:24 +0000628 d_instantiate(dentry, inode);
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100629 error = 0;
Miklos Szeredi0d0d1102013-09-16 14:52:00 +0200630 if (file) {
Al Viro44bb31b2014-11-19 19:35:24 +0000631 if (S_ISREG(inode->i_mode))
Miklos Szeredi5ca1db42013-09-23 13:21:04 +0100632 error = finish_open(file, dentry, gfs2_open_common, opened);
Al Viro44bb31b2014-11-19 19:35:24 +0000633 else
634 error = finish_no_open(file, NULL);
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100635 }
Steven Whitehouse5a00f3c2013-06-11 13:45:29 +0100636 gfs2_glock_dq_uninit(ghs);
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100637 return error;
Steven Whitehouse5a00f3c2013-06-11 13:45:29 +0100638 } else if (error != -ENOENT) {
639 goto fail_gunlock;
640 }
641
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +0000642 error = gfs2_diradd_alloc_required(dir, name, &da);
Steven Whitehousefd4b4e02013-02-26 16:15:20 +0000643 if (error < 0)
644 goto fail_gunlock;
645
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000646 inode = new_inode(sdp->sd_vfs);
Steven Whitehousefd4b4e02013-02-26 16:15:20 +0000647 error = -ENOMEM;
648 if (!inode)
649 goto fail_gunlock;
650
Christoph Hellwige01580b2013-12-20 05:16:52 -0800651 error = posix_acl_create(dir, &mode, &default_acl, &acl);
652 if (error)
653 goto fail_free_vfs_inode;
654
Bob Peterson8e2e0042012-07-19 08:12:40 -0400655 ip = GFS2_I(inode);
Steven Whitehouseff7f4cb2012-09-10 10:03:50 +0100656 error = gfs2_rs_alloc(ip);
657 if (error)
Christoph Hellwige01580b2013-12-20 05:16:52 -0800658 goto fail_free_acls;
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000659
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000660 inode->i_mode = mode;
Steven Whitehouse79ba7482013-03-01 09:29:12 +0000661 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000662 inode->i_rdev = dev;
663 inode->i_size = size;
Steven Whitehousefd4b4e02013-02-26 16:15:20 +0000664 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
Steven Whitehouse28fb3022013-02-26 19:09:35 +0000665 gfs2_set_inode_blocks(inode, 1);
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000666 munge_mode_uid_gid(dip, inode);
Abhi Das00a158b2014-09-18 21:40:28 -0500667 check_and_update_goal(dip);
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000668 ip->i_goal = dip->i_goal;
Steven Whitehouse28fb3022013-02-26 19:09:35 +0000669 ip->i_diskflags = 0;
670 ip->i_eattr = 0;
671 ip->i_height = 0;
672 ip->i_depth = 0;
673 ip->i_entries = 0;
674
675 switch(mode & S_IFMT) {
676 case S_IFREG:
677 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
678 gfs2_tune_get(sdp, gt_new_files_jdata))
679 ip->i_diskflags |= GFS2_DIF_JDATA;
680 gfs2_set_aops(inode);
681 break;
682 case S_IFDIR:
683 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
684 ip->i_diskflags |= GFS2_DIF_JDATA;
685 ip->i_entries = 2;
686 break;
687 }
688 gfs2_set_inode_flags(inode);
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000689
David Howells2b0143b2015-03-17 22:25:59 +0000690 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
Steven Whitehouse9dbe9612012-10-31 10:37:10 +0000691 (dip->i_diskflags & GFS2_DIF_TOPDIR))
692 aflags |= GFS2_AF_ORLOV;
693
Steven Whitehouseb2c8b3e2014-02-04 15:45:11 +0000694 if (default_acl || acl)
695 blocks++;
696
697 error = alloc_dinode(ip, aflags, &blocks);
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000698 if (error)
699 goto fail_free_inode;
700
Steven Whitehouseb2c8b3e2014-02-04 15:45:11 +0000701 gfs2_set_inode_blocks(inode, blocks);
702
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000703 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
704 if (error)
705 goto fail_free_inode;
706
Bob Peterson1e2d9d42012-11-21 09:56:00 -0500707 ip->i_gl->gl_object = ip;
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000708 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
709 if (error)
710 goto fail_free_inode;
711
Steven Whitehouseb2c8b3e2014-02-04 15:45:11 +0000712 error = gfs2_trans_begin(sdp, blocks, 0);
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000713 if (error)
Steven Whitehouseff7f4cb2012-09-10 10:03:50 +0100714 goto fail_gunlock2;
Bob Peterson0a305e42012-06-06 11:17:59 +0100715
Steven Whitehouseb2c8b3e2014-02-04 15:45:11 +0000716 if (blocks > 1) {
717 ip->i_eattr = ip->i_no_addr + 1;
718 gfs2_init_xattr(ip);
719 }
Steven Whitehouse79ba7482013-03-01 09:29:12 +0000720 init_dinode(dip, ip, symname);
Steven Whitehousefd4b4e02013-02-26 16:15:20 +0000721 gfs2_trans_end(sdp);
722
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000723 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
724 if (error)
725 goto fail_gunlock2;
726
727 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
728 if (error)
729 goto fail_gunlock2;
730
731 ip->i_iopen_gh.gh_gl->gl_object = ip;
732 gfs2_glock_put(io_gl);
733 gfs2_set_iop(inode);
734 insert_inode_hash(inode);
735
Christoph Hellwige01580b2013-12-20 05:16:52 -0800736 if (default_acl) {
737 error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
738 posix_acl_release(default_acl);
739 }
740 if (acl) {
741 if (!error)
742 error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
743 posix_acl_release(acl);
744 }
745
Steven Whitehouse194c0112011-05-09 14:06:38 +0100746 if (error)
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000747 goto fail_gunlock3;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100748
Bob Petersonf45dc262014-03-19 09:37:00 -0400749 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
750 &gfs2_initxattrs, NULL);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100751 if (error)
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000752 goto fail_gunlock3;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100753
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +0000754 error = link_dinode(dip, name, ip, &da);
Steven Whitehouse194c0112011-05-09 14:06:38 +0100755 if (error)
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000756 goto fail_gunlock3;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100757
Steven Whitehouse79ba7482013-03-01 09:29:12 +0000758 mark_inode_dirty(inode);
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100759 d_instantiate(dentry, inode);
Miklos Szeredic5bf8fe2013-09-16 14:52:03 +0200760 if (file) {
761 *opened |= FILE_CREATED;
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100762 error = finish_open(file, dentry, gfs2_open_common, opened);
Miklos Szeredic5bf8fe2013-09-16 14:52:03 +0200763 }
Steven Whitehouse28fb3022013-02-26 19:09:35 +0000764 gfs2_glock_dq_uninit(ghs);
765 gfs2_glock_dq_uninit(ghs + 1);
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100766 return error;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100767
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000768fail_gunlock3:
769 gfs2_glock_dq_uninit(ghs + 1);
770 if (ip->i_gl)
771 gfs2_glock_put(ip->i_gl);
772 goto fail_gunlock;
773
Steven Whitehouse194c0112011-05-09 14:06:38 +0100774fail_gunlock2:
775 gfs2_glock_dq_uninit(ghs + 1);
Steven Whitehousec9aecf72012-10-31 10:30:22 +0000776fail_free_inode:
777 if (ip->i_gl)
778 gfs2_glock_put(ip->i_gl);
Steven Whitehouseaf5c2692013-09-27 12:49:33 +0100779 gfs2_rs_delete(ip, NULL);
Christoph Hellwige01580b2013-12-20 05:16:52 -0800780fail_free_acls:
781 if (default_acl)
782 posix_acl_release(default_acl);
783 if (acl)
784 posix_acl_release(acl);
785fail_free_vfs_inode:
Abhi Das05978802014-03-31 10:33:17 -0500786 free_vfs_inode = 1;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100787fail_gunlock:
Steven Whitehouse2b47dad2014-01-06 12:49:43 +0000788 gfs2_dir_no_add(&da);
Steven Whitehousef2741d92011-05-13 12:11:17 +0100789 gfs2_glock_dq_uninit(ghs);
Steven Whitehouse40ac2182011-08-02 13:17:27 +0100790 if (inode && !IS_ERR(inode)) {
Steven Whitehouse79ba7482013-03-01 09:29:12 +0000791 clear_nlink(inode);
Abhi Das05978802014-03-31 10:33:17 -0500792 if (!free_vfs_inode)
793 mark_inode_dirty(inode);
794 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
795 &GFS2_I(inode)->i_flags);
Steven Whitehouse40ac2182011-08-02 13:17:27 +0100796 iput(inode);
797 }
Steven Whitehouse194c0112011-05-09 14:06:38 +0100798fail:
Steven Whitehousef2741d92011-05-13 12:11:17 +0100799 return error;
Steven Whitehouse194c0112011-05-09 14:06:38 +0100800}
Steven Whitehousef2741d92011-05-13 12:11:17 +0100801
David Teiglandb3b94fa2006-01-16 16:50:04 +0000802/**
803 * gfs2_create - Create a file
804 * @dir: The directory in which to create the file
805 * @dentry: The dentry of the new file
806 * @mode: The mode of the new file
807 *
808 * Returns: errno
809 */
810
811static int gfs2_create(struct inode *dir, struct dentry *dentry,
Al Viroebfc3b42012-06-10 18:05:36 -0400812 umode_t mode, bool excl)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000813{
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100814 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000815}
816
817/**
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100818 * __gfs2_lookup - Look up a filename in a directory and return its inode
David Teiglandb3b94fa2006-01-16 16:50:04 +0000819 * @dir: The directory inode
820 * @dentry: The dentry of the new inode
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100821 * @file: File to be opened
822 * @opened: atomic_open flags
David Teiglandb3b94fa2006-01-16 16:50:04 +0000823 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000824 *
825 * Returns: errno
826 */
827
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100828static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
829 struct file *file, int *opened)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000830{
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100831 struct inode *inode;
832 struct dentry *d;
833 struct gfs2_holder gh;
834 struct gfs2_glock *gl;
835 int error;
836
837 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
Benjamin Coddington7b7a9112014-09-10 14:09:20 -0400838 if (inode == NULL) {
839 d_add(dentry, NULL);
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100840 return NULL;
Benjamin Coddington7b7a9112014-09-10 14:09:20 -0400841 }
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100842 if (IS_ERR(inode))
843 return ERR_CAST(inode);
844
845 gl = GFS2_I(inode)->i_gl;
846 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
847 if (error) {
848 iput(inode);
849 return ERR_PTR(error);
Steven Whitehouse9656b2c2008-01-08 08:14:30 +0000850 }
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100851
852 d = d_splice_alias(inode, dentry);
J. Bruce Fieldsd57b9c92014-01-16 13:51:07 -0500853 if (IS_ERR(d)) {
J. Bruce Fieldsd57b9c92014-01-16 13:51:07 -0500854 gfs2_glock_dq_uninit(&gh);
855 return d;
856 }
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100857 if (file && S_ISREG(inode->i_mode))
858 error = finish_open(file, dentry, gfs2_open_common, opened);
859
860 gfs2_glock_dq_uninit(&gh);
Miklos Szeredi5ca1db42013-09-23 13:21:04 +0100861 if (error) {
862 dput(d);
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100863 return ERR_PTR(error);
Miklos Szeredi5ca1db42013-09-23 13:21:04 +0100864 }
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100865 return d;
866}
867
868static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
869 unsigned flags)
870{
871 return __gfs2_lookup(dir, dentry, NULL, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000872}
873
874/**
875 * gfs2_link - Link to a file
876 * @old_dentry: The inode to link
877 * @dir: Add link to this directory
878 * @dentry: The name of the link
879 *
880 * Link the inode in "old_dentry" into the directory "dir" with the
881 * name in "dentry".
882 *
883 * Returns: errno
884 */
885
886static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
887 struct dentry *dentry)
888{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400889 struct gfs2_inode *dip = GFS2_I(dir);
890 struct gfs2_sbd *sdp = GFS2_SB(dir);
David Howells2b0143b2015-03-17 22:25:59 +0000891 struct inode *inode = d_inode(old_dentry);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400892 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000893 struct gfs2_holder ghs[2];
Steven Whitehouse2baee032011-05-09 12:08:36 +0100894 struct buffer_head *dibh;
Bob Peterson19aeb5a2014-09-29 08:52:04 -0400895 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
David Teiglandb3b94fa2006-01-16 16:50:04 +0000896 int error;
897
Steven Whitehouseb60623c2006-11-01 12:22:46 -0500898 if (S_ISDIR(inode->i_mode))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000899 return -EPERM;
900
Bob Peterson0a305e42012-06-06 11:17:59 +0100901 error = gfs2_rs_alloc(dip);
902 if (error)
903 return error;
904
David Teiglandb3b94fa2006-01-16 16:50:04 +0000905 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
906 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
907
Bob Peterson72dbf472008-08-12 13:39:29 -0500908 error = gfs2_glock_nq(ghs); /* parent */
David Teiglandb3b94fa2006-01-16 16:50:04 +0000909 if (error)
Bob Peterson72dbf472008-08-12 13:39:29 -0500910 goto out_parent;
911
912 error = gfs2_glock_nq(ghs + 1); /* child */
913 if (error)
914 goto out_child;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000915
Steven Whitehoused192a8e2011-05-05 12:35:40 +0100916 error = -ENOENT;
917 if (inode->i_nlink == 0)
918 goto out_gunlock;
919
Al Viro10556cb2011-06-20 19:28:19 -0400920 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000921 if (error)
922 goto out_gunlock;
923
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100924 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000925 switch (error) {
926 case -ENOENT:
927 break;
928 case 0:
929 error = -EEXIST;
930 default:
931 goto out_gunlock;
932 }
933
934 error = -EINVAL;
Steven Whitehouse4f561102006-11-01 14:04:17 -0500935 if (!dip->i_inode.i_nlink)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000936 goto out_gunlock;
937 error = -EFBIG;
Steven Whitehousead6203f2008-11-03 13:59:19 +0000938 if (dip->i_entries == (u32)-1)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000939 goto out_gunlock;
940 error = -EPERM;
941 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
942 goto out_gunlock;
943 error = -EINVAL;
Steven Whitehouse4f561102006-11-01 14:04:17 -0500944 if (!ip->i_inode.i_nlink)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000945 goto out_gunlock;
946 error = -EMLINK;
Steven Whitehouse4f561102006-11-01 14:04:17 -0500947 if (ip->i_inode.i_nlink == (u32)-1)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000948 goto out_gunlock;
949
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +0000950 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
Steven Whitehousec7526662006-03-20 12:30:04 -0500951 if (error < 0)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000952 goto out_gunlock;
953
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +0000954 if (da.nr_blocks) {
955 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
Abhi Dasb8fbf472015-03-18 12:03:41 -0500956 error = gfs2_quota_lock_check(dip, &ap);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000957 if (error)
Bob Peterson5407e242012-05-18 09:28:23 -0400958 goto out_gunlock;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000959
Steven Whitehouse7b9cff42013-10-02 11:13:25 +0100960 error = gfs2_inplace_reserve(dip, &ap);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000961 if (error)
962 goto out_gunlock_q;
963
Steven Whitehouse534cf9c2014-01-06 12:03:05 +0000964 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000965 if (error)
966 goto out_ipres;
967 } else {
968 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
969 if (error)
970 goto out_ipres;
971 }
972
Steven Whitehouse2baee032011-05-09 12:08:36 +0100973 error = gfs2_meta_inode_buffer(ip, &dibh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000974 if (error)
975 goto out_end_trans;
976
Steven Whitehouse2b47dad2014-01-06 12:49:43 +0000977 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
Steven Whitehouse2baee032011-05-09 12:08:36 +0100978 if (error)
979 goto out_brelse;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000980
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000981 gfs2_trans_add_meta(ip->i_gl, dibh);
Steven Whitehouse2baee032011-05-09 12:08:36 +0100982 inc_nlink(&ip->i_inode);
983 ip->i_inode.i_ctime = CURRENT_TIME;
Steven Whitehouseab9bbda2011-08-15 14:20:36 +0100984 ihold(inode);
985 d_instantiate(dentry, inode);
986 mark_inode_dirty(inode);
Steven Whitehouse2baee032011-05-09 12:08:36 +0100987
988out_brelse:
989 brelse(dibh);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400990out_end_trans:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000991 gfs2_trans_end(sdp);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400992out_ipres:
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +0000993 if (da.nr_blocks)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000994 gfs2_inplace_release(dip);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400995out_gunlock_q:
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +0000996 if (da.nr_blocks)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000997 gfs2_quota_unlock(dip);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400998out_gunlock:
Steven Whitehouse2b47dad2014-01-06 12:49:43 +0000999 gfs2_dir_no_add(&da);
Bob Peterson72dbf472008-08-12 13:39:29 -05001000 gfs2_glock_dq(ghs + 1);
1001out_child:
1002 gfs2_glock_dq(ghs);
1003out_parent:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001004 gfs2_holder_uninit(ghs);
1005 gfs2_holder_uninit(ghs + 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001006 return error;
1007}
1008
Steven Whitehouse87ec2172009-05-22 10:54:50 +01001009/*
1010 * gfs2_unlink_ok - check to see that a inode is still in a directory
1011 * @dip: the directory
1012 * @name: the name of the file
1013 * @ip: the inode
1014 *
1015 * Assumes that the lock on (at least) @dip is held.
1016 *
1017 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1018 */
1019
1020static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1021 const struct gfs2_inode *ip)
1022{
1023 int error;
1024
1025 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1026 return -EPERM;
1027
1028 if ((dip->i_inode.i_mode & S_ISVTX) &&
Eric W. Biederman6b24c0d2013-01-31 21:56:13 -08001029 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1030 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
Steven Whitehouse87ec2172009-05-22 10:54:50 +01001031 return -EPERM;
1032
1033 if (IS_APPEND(&dip->i_inode))
1034 return -EPERM;
1035
Al Viro10556cb2011-06-20 19:28:19 -04001036 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
Steven Whitehouse87ec2172009-05-22 10:54:50 +01001037 if (error)
1038 return error;
1039
Fabian Frederick37975f12014-10-09 22:49:21 +02001040 return gfs2_dir_check(&dip->i_inode, name, ip);
Steven Whitehouse87ec2172009-05-22 10:54:50 +01001041}
1042
David Teiglandb3b94fa2006-01-16 16:50:04 +00001043/**
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001044 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1045 * @dip: The parent directory
1046 * @name: The name of the entry in the parent directory
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001047 * @inode: The inode to be removed
1048 *
1049 * Called with all the locks and in a transaction. This will only be
1050 * called for a directory after it has been checked to ensure it is empty.
1051 *
1052 * Returns: 0 on success, or an error
1053 */
1054
1055static int gfs2_unlink_inode(struct gfs2_inode *dip,
Bob Peterson4327a9b2012-11-12 13:03:29 -05001056 const struct dentry *dentry)
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001057{
David Howells2b0143b2015-03-17 22:25:59 +00001058 struct inode *inode = d_inode(dentry);
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001059 struct gfs2_inode *ip = GFS2_I(inode);
1060 int error;
1061
1062 error = gfs2_dir_del(dip, dentry);
1063 if (error)
1064 return error;
1065
1066 ip->i_entries = 0;
1067 inode->i_ctime = CURRENT_TIME;
1068 if (S_ISDIR(inode->i_mode))
1069 clear_nlink(inode);
1070 else
1071 drop_nlink(inode);
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001072 mark_inode_dirty(inode);
1073 if (inode->i_nlink == 0)
1074 gfs2_unlink_di(inode);
1075 return 0;
1076}
1077
1078
1079/**
1080 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1081 * @dir: The inode of the directory containing the inode to unlink
David Teiglandb3b94fa2006-01-16 16:50:04 +00001082 * @dentry: The file itself
1083 *
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001084 * This routine uses the type of the inode as a flag to figure out
1085 * whether this is an unlink or an rmdir.
David Teiglandb3b94fa2006-01-16 16:50:04 +00001086 *
1087 * Returns: errno
1088 */
1089
1090static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1091{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001092 struct gfs2_inode *dip = GFS2_I(dir);
1093 struct gfs2_sbd *sdp = GFS2_SB(dir);
David Howells2b0143b2015-03-17 22:25:59 +00001094 struct inode *inode = d_inode(dentry);
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001095 struct gfs2_inode *ip = GFS2_I(inode);
Russell Cattelanddee7602007-01-29 17:13:44 -06001096 struct gfs2_holder ghs[3];
1097 struct gfs2_rgrpd *rgd;
Bob Peterson5e2f7d62012-04-04 22:11:16 -04001098 int error;
1099
1100 error = gfs2_rindex_update(sdp);
1101 if (error)
1102 return error;
1103
1104 error = -EROFS;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001105
Russell Cattelanddee7602007-01-29 17:13:44 -06001106 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1107 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1108
Steven Whitehouse66fc0612012-02-08 12:58:32 +00001109 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
Steven Whitehousea365fbf2012-02-24 15:09:14 +00001110 if (!rgd)
Steven Whitehouse87654892011-11-08 14:04:20 +00001111 goto out_inodes;
Steven Whitehousea365fbf2012-02-24 15:09:14 +00001112
Russell Cattelanddee7602007-01-29 17:13:44 -06001113 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1114
1115
Steven Whitehouse8497a462007-08-26 14:23:56 +01001116 error = gfs2_glock_nq(ghs); /* parent */
David Teiglandb3b94fa2006-01-16 16:50:04 +00001117 if (error)
Steven Whitehouse8497a462007-08-26 14:23:56 +01001118 goto out_parent;
1119
1120 error = gfs2_glock_nq(ghs + 1); /* child */
1121 if (error)
1122 goto out_child;
1123
Steven Whitehoused192a8e2011-05-05 12:35:40 +01001124 error = -ENOENT;
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001125 if (inode->i_nlink == 0)
Steven Whitehoused192a8e2011-05-05 12:35:40 +01001126 goto out_rgrp;
1127
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001128 if (S_ISDIR(inode->i_mode)) {
1129 error = -ENOTEMPTY;
1130 if (ip->i_entries > 2 || inode->i_nlink > 2)
1131 goto out_rgrp;
1132 }
1133
Steven Whitehouse8497a462007-08-26 14:23:56 +01001134 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1135 if (error)
1136 goto out_rgrp;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001137
1138 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1139 if (error)
Bob Peterson72dbf472008-08-12 13:39:29 -05001140 goto out_gunlock;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001141
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001142 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001143 if (error)
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001144 goto out_end_trans;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001145
Bob Peterson4327a9b2012-11-12 13:03:29 -05001146 error = gfs2_unlink_inode(dip, dentry);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001147
1148out_end_trans:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001149 gfs2_trans_end(sdp);
Bob Peterson72dbf472008-08-12 13:39:29 -05001150out_gunlock:
Steven Whitehouse8497a462007-08-26 14:23:56 +01001151 gfs2_glock_dq(ghs + 2);
1152out_rgrp:
Steven Whitehouse8497a462007-08-26 14:23:56 +01001153 gfs2_glock_dq(ghs + 1);
1154out_child:
Steven Whitehouse8497a462007-08-26 14:23:56 +01001155 gfs2_glock_dq(ghs);
1156out_parent:
Steven Whitehouse87654892011-11-08 14:04:20 +00001157 gfs2_holder_uninit(ghs + 2);
1158out_inodes:
1159 gfs2_holder_uninit(ghs + 1);
Steven Whitehouse8497a462007-08-26 14:23:56 +01001160 gfs2_holder_uninit(ghs);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001161 return error;
1162}
1163
1164/**
1165 * gfs2_symlink - Create a symlink
1166 * @dir: The directory to create the symlink in
1167 * @dentry: The dentry to put the symlink in
1168 * @symname: The thing which the link points to
1169 *
1170 * Returns: errno
1171 */
1172
1173static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1174 const char *symname)
1175{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001176 struct gfs2_sbd *sdp = GFS2_SB(dir);
Steven Whitehouse160b4022011-05-13 10:34:59 +01001177 unsigned int size;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001178
David Teiglandb3b94fa2006-01-16 16:50:04 +00001179 size = strlen(symname);
1180 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1181 return -ENAMETOOLONG;
1182
Steven Whitehouse6d4ade92013-06-14 11:17:15 +01001183 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001184}
1185
1186/**
1187 * gfs2_mkdir - Make a directory
1188 * @dir: The parent directory of the new one
1189 * @dentry: The dentry of the new directory
1190 * @mode: The mode of the new directory
1191 *
1192 * Returns: errno
1193 */
1194
Al Viro18bb1db2011-07-26 01:41:39 -04001195static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001196{
Steven Whitehouse28fb3022013-02-26 19:09:35 +00001197 struct gfs2_sbd *sdp = GFS2_SB(dir);
1198 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
Steven Whitehouse6d4ade92013-06-14 11:17:15 +01001199 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001200}
1201
1202/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001203 * gfs2_mknod - Make a special file
1204 * @dir: The directory in which the special file will reside
1205 * @dentry: The dentry of the special file
1206 * @mode: The mode of the special file
Steven Whitehousef2741d92011-05-13 12:11:17 +01001207 * @dev: The device specification of the special file
David Teiglandb3b94fa2006-01-16 16:50:04 +00001208 *
1209 */
1210
Al Viro1a67aaf2011-07-26 01:52:52 -04001211static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001212 dev_t dev)
1213{
Steven Whitehouse6d4ade92013-06-14 11:17:15 +01001214 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1215}
1216
1217/**
1218 * gfs2_atomic_open - Atomically open a file
1219 * @dir: The directory
1220 * @dentry: The proposed new entry
1221 * @file: The proposed new struct file
1222 * @flags: open flags
1223 * @mode: File mode
1224 * @opened: Flag to say whether the file has been opened or not
1225 *
1226 * Returns: error code or 0 for success
1227 */
1228
1229static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
Antonio Ospite86fbca42015-05-01 12:54:38 -05001230 struct file *file, unsigned flags,
1231 umode_t mode, int *opened)
Steven Whitehouse6d4ade92013-06-14 11:17:15 +01001232{
1233 struct dentry *d;
1234 bool excl = !!(flags & O_EXCL);
1235
Al Viro4d93bc32014-09-12 18:21:05 -04001236 if (!d_unhashed(dentry))
1237 goto skip_lookup;
1238
Steven Whitehouse6d4ade92013-06-14 11:17:15 +01001239 d = __gfs2_lookup(dir, dentry, file, opened);
1240 if (IS_ERR(d))
1241 return PTR_ERR(d);
Miklos Szeredi5ca1db42013-09-23 13:21:04 +01001242 if (d != NULL)
1243 dentry = d;
David Howells2b0143b2015-03-17 22:25:59 +00001244 if (d_really_is_positive(dentry)) {
Al Viroec7d8792014-11-19 19:35:58 +00001245 if (!(*opened & FILE_OPENED))
1246 return finish_no_open(file, d);
Miklos Szeredi5ca1db42013-09-23 13:21:04 +01001247 dput(d);
Steven Whitehouse6d4ade92013-06-14 11:17:15 +01001248 return 0;
1249 }
1250
Miklos Szeredi5ca1db42013-09-23 13:21:04 +01001251 BUG_ON(d != NULL);
Al Viro4d93bc32014-09-12 18:21:05 -04001252
1253skip_lookup:
Steven Whitehouse6d4ade92013-06-14 11:17:15 +01001254 if (!(flags & O_CREAT))
1255 return -ENOENT;
1256
1257 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001258}
1259
Steven Whitehouse0188d6c2008-08-26 09:38:26 +01001260/*
1261 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1262 * @this: move this
1263 * @to: to here
1264 *
1265 * Follow @to back to the root and make sure we don't encounter @this
1266 * Assumes we already hold the rename lock.
1267 *
1268 * Returns: errno
1269 */
1270
1271static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1272{
1273 struct inode *dir = &to->i_inode;
1274 struct super_block *sb = dir->i_sb;
1275 struct inode *tmp;
Steven Whitehouse0188d6c2008-08-26 09:38:26 +01001276 int error = 0;
1277
Steven Whitehouse0188d6c2008-08-26 09:38:26 +01001278 igrab(dir);
1279
1280 for (;;) {
1281 if (dir == &this->i_inode) {
1282 error = -EINVAL;
1283 break;
1284 }
David Howells2b0143b2015-03-17 22:25:59 +00001285 if (dir == d_inode(sb->s_root)) {
Steven Whitehouse0188d6c2008-08-26 09:38:26 +01001286 error = 0;
1287 break;
1288 }
1289
Steven Whitehouse8d123582010-09-17 12:30:23 +01001290 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
Abhi Das48f8f712014-03-12 03:41:44 -05001291 if (!tmp) {
1292 error = -ENOENT;
1293 break;
1294 }
Steven Whitehouse0188d6c2008-08-26 09:38:26 +01001295 if (IS_ERR(tmp)) {
1296 error = PTR_ERR(tmp);
1297 break;
1298 }
1299
1300 iput(dir);
1301 dir = tmp;
1302 }
1303
1304 iput(dir);
1305
1306 return error;
1307}
1308
David Teiglandb3b94fa2006-01-16 16:50:04 +00001309/**
Benjamin Marzinskia63b7bb2015-05-05 12:12:19 -05001310 * update_moved_ino - Update an inode that's being moved
1311 * @ip: The inode being moved
1312 * @ndip: The parent directory of the new filename
1313 * @dir_rename: True of ip is a directory
1314 *
1315 * Returns: errno
1316 */
1317
1318static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1319 int dir_rename)
1320{
1321 int error;
1322 struct buffer_head *dibh;
1323
1324 if (dir_rename)
1325 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1326
1327 error = gfs2_meta_inode_buffer(ip, &dibh);
1328 if (error)
1329 return error;
1330 ip->i_inode.i_ctime = CURRENT_TIME;
1331 gfs2_trans_add_meta(ip->i_gl, dibh);
1332 gfs2_dinode_out(ip, dibh->b_data);
1333 brelse(dibh);
1334 return 0;
1335}
1336
1337
1338/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001339 * gfs2_rename - Rename a file
1340 * @odir: Parent directory of old file name
1341 * @odentry: The old dentry of the file
1342 * @ndir: Parent directory of new file name
1343 * @ndentry: The new dentry of the file
1344 *
1345 * Returns: errno
1346 */
1347
1348static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1349 struct inode *ndir, struct dentry *ndentry)
1350{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001351 struct gfs2_inode *odip = GFS2_I(odir);
1352 struct gfs2_inode *ndip = GFS2_I(ndir);
David Howells2b0143b2015-03-17 22:25:59 +00001353 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001354 struct gfs2_inode *nip = NULL;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001355 struct gfs2_sbd *sdp = GFS2_SB(odir);
Steven Whitehouse8339ee52011-08-31 16:38:29 +01001356 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
Russell Cattelanddee7602007-01-29 17:13:44 -06001357 struct gfs2_rgrpd *nrgd;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001358 unsigned int num_gh;
1359 int dir_rename = 0;
Bob Peterson19aeb5a2014-09-29 08:52:04 -04001360 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
David Teiglandb3b94fa2006-01-16 16:50:04 +00001361 unsigned int x;
1362 int error;
1363
David Howells2b0143b2015-03-17 22:25:59 +00001364 if (d_really_is_positive(ndentry)) {
1365 nip = GFS2_I(d_inode(ndentry));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001366 if (ip == nip)
1367 return 0;
1368 }
1369
Bob Peterson5e2f7d62012-04-04 22:11:16 -04001370 error = gfs2_rindex_update(sdp);
1371 if (error)
1372 return error;
1373
Bob Peterson0a305e42012-06-06 11:17:59 +01001374 error = gfs2_rs_alloc(ndip);
1375 if (error)
1376 return error;
1377
Steven Whitehouse0188d6c2008-08-26 09:38:26 +01001378 if (odip != ndip) {
1379 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1380 0, &r_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001381 if (error)
1382 goto out;
1383
Steven Whitehouse0188d6c2008-08-26 09:38:26 +01001384 if (S_ISDIR(ip->i_inode.i_mode)) {
1385 dir_rename = 1;
Benjamin Marzinskia63b7bb2015-05-05 12:12:19 -05001386 /* don't move a directory into its subdir */
Steven Whitehouse0188d6c2008-08-26 09:38:26 +01001387 error = gfs2_ok_to_move(ip, ndip);
1388 if (error)
1389 goto out_gunlock_r;
1390 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001391 }
1392
Steven Whitehoused9d1ca32006-06-21 15:38:17 -04001393 num_gh = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001394 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
Steven Whitehoused9d1ca32006-06-21 15:38:17 -04001395 if (odip != ndip) {
1396 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1397 num_gh++;
1398 }
1399 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1400 num_gh++;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001401
Steven Whitehoused9d1ca32006-06-21 15:38:17 -04001402 if (nip) {
1403 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1404 num_gh++;
Russell Cattelanddee7602007-01-29 17:13:44 -06001405 /* grab the resource lock for unlink flag twiddling
1406 * this is the case of the target file already existing
1407 * so we unlink before doing the rename
1408 */
Steven Whitehouse66fc0612012-02-08 12:58:32 +00001409 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
Russell Cattelanddee7602007-01-29 17:13:44 -06001410 if (nrgd)
1411 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
Steven Whitehoused9d1ca32006-06-21 15:38:17 -04001412 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001413
Bob Peterson72dbf472008-08-12 13:39:29 -05001414 for (x = 0; x < num_gh; x++) {
1415 error = gfs2_glock_nq(ghs + x);
1416 if (error)
1417 goto out_gunlock;
1418 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001419
Steven Whitehoused192a8e2011-05-05 12:35:40 +01001420 error = -ENOENT;
1421 if (ip->i_inode.i_nlink == 0)
1422 goto out_gunlock;
1423
David Teiglandb3b94fa2006-01-16 16:50:04 +00001424 /* Check out the old directory */
1425
1426 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1427 if (error)
1428 goto out_gunlock;
1429
1430 /* Check out the new directory */
1431
1432 if (nip) {
1433 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1434 if (error)
1435 goto out_gunlock;
1436
Steven Whitehoused192a8e2011-05-05 12:35:40 +01001437 if (nip->i_inode.i_nlink == 0) {
1438 error = -EAGAIN;
1439 goto out_gunlock;
1440 }
1441
Steven Whitehouseb60623c2006-11-01 12:22:46 -05001442 if (S_ISDIR(nip->i_inode.i_mode)) {
Steven Whitehousead6203f2008-11-03 13:59:19 +00001443 if (nip->i_entries < 2) {
Steven Whitehouse94fb7632011-05-09 13:36:10 +01001444 gfs2_consist_inode(nip);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001445 error = -EIO;
1446 goto out_gunlock;
1447 }
Steven Whitehousead6203f2008-11-03 13:59:19 +00001448 if (nip->i_entries > 2) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001449 error = -ENOTEMPTY;
1450 goto out_gunlock;
1451 }
1452 }
1453 } else {
Al Viro10556cb2011-06-20 19:28:19 -04001454 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001455 if (error)
1456 goto out_gunlock;
1457
Steven Whitehousedbb7cae2007-05-15 15:37:50 +01001458 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001459 switch (error) {
1460 case -ENOENT:
1461 error = 0;
1462 break;
1463 case 0:
1464 error = -EEXIST;
1465 default:
1466 goto out_gunlock;
1467 };
1468
1469 if (odip != ndip) {
Steven Whitehouse4f561102006-11-01 14:04:17 -05001470 if (!ndip->i_inode.i_nlink) {
Steven Whitehoused192a8e2011-05-05 12:35:40 +01001471 error = -ENOENT;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001472 goto out_gunlock;
1473 }
Steven Whitehousead6203f2008-11-03 13:59:19 +00001474 if (ndip->i_entries == (u32)-1) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001475 error = -EFBIG;
1476 goto out_gunlock;
1477 }
Steven Whitehouseb60623c2006-11-01 12:22:46 -05001478 if (S_ISDIR(ip->i_inode.i_mode) &&
Steven Whitehouse4f561102006-11-01 14:04:17 -05001479 ndip->i_inode.i_nlink == (u32)-1) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001480 error = -EMLINK;
1481 goto out_gunlock;
1482 }
1483 }
1484 }
1485
1486 /* Check out the dir to be renamed */
1487
1488 if (dir_rename) {
David Howells2b0143b2015-03-17 22:25:59 +00001489 error = gfs2_permission(d_inode(odentry), MAY_WRITE);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001490 if (error)
1491 goto out_gunlock;
1492 }
1493
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00001494 if (nip == NULL) {
1495 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1496 if (error)
1497 goto out_gunlock;
1498 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001499
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00001500 if (da.nr_blocks) {
1501 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
Abhi Dasb8fbf472015-03-18 12:03:41 -05001502 error = gfs2_quota_lock_check(ndip, &ap);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001503 if (error)
Bob Peterson5407e242012-05-18 09:28:23 -04001504 goto out_gunlock;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001505
Steven Whitehouse7b9cff42013-10-02 11:13:25 +01001506 error = gfs2_inplace_reserve(ndip, &ap);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001507 if (error)
1508 goto out_gunlock_q;
1509
Steven Whitehouse534cf9c2014-01-06 12:03:05 +00001510 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1511 4 * RES_LEAF + 4, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001512 if (error)
1513 goto out_ipreserv;
1514 } else {
1515 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
S. Wendy Cheng87d21e02007-01-18 16:07:03 -05001516 5 * RES_LEAF + 4, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001517 if (error)
1518 goto out_gunlock;
1519 }
1520
1521 /* Remove the target file, if it exists */
1522
Bob Peterson4327a9b2012-11-12 13:03:29 -05001523 if (nip)
1524 error = gfs2_unlink_inode(ndip, ndentry);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001525
Benjamin Marzinskia63b7bb2015-05-05 12:12:19 -05001526 error = update_moved_ino(ip, ndip, dir_rename);
1527 if (error)
1528 goto out_end_trans;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001529
Steven Whitehouse855d23c2011-05-09 16:42:37 +01001530 error = gfs2_dir_del(odip, odentry);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001531 if (error)
1532 goto out_end_trans;
1533
Steven Whitehouse2b47dad2014-01-06 12:49:43 +00001534 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001535 if (error)
1536 goto out_end_trans;
1537
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001538out_end_trans:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001539 gfs2_trans_end(sdp);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001540out_ipreserv:
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00001541 if (da.nr_blocks)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001542 gfs2_inplace_release(ndip);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001543out_gunlock_q:
Steven Whitehouse3c1c0ae2014-01-06 11:28:41 +00001544 if (da.nr_blocks)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001545 gfs2_quota_unlock(ndip);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001546out_gunlock:
Steven Whitehouse2b47dad2014-01-06 12:49:43 +00001547 gfs2_dir_no_add(&da);
Bob Peterson72dbf472008-08-12 13:39:29 -05001548 while (x--) {
1549 gfs2_glock_dq(ghs + x);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001550 gfs2_holder_uninit(ghs + x);
Bob Peterson72dbf472008-08-12 13:39:29 -05001551 }
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001552out_gunlock_r:
Steven Whitehouse0188d6c2008-08-26 09:38:26 +01001553 if (r_gh.gh_gl)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001554 gfs2_glock_dq_uninit(&r_gh);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001555out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001556 return error;
1557}
1558
1559/**
Benjamin Marzinskia63b7bb2015-05-05 12:12:19 -05001560 * gfs2_exchange - exchange two files
1561 * @odir: Parent directory of old file name
1562 * @odentry: The old dentry of the file
1563 * @ndir: Parent directory of new file name
1564 * @ndentry: The new dentry of the file
1565 * @flags: The rename flags
1566 *
1567 * Returns: errno
1568 */
1569
1570static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1571 struct inode *ndir, struct dentry *ndentry,
1572 unsigned int flags)
1573{
1574 struct gfs2_inode *odip = GFS2_I(odir);
1575 struct gfs2_inode *ndip = GFS2_I(ndir);
1576 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1577 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1578 struct gfs2_sbd *sdp = GFS2_SB(odir);
1579 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1580 unsigned int num_gh;
1581 unsigned int x;
1582 umode_t old_mode = oip->i_inode.i_mode;
1583 umode_t new_mode = nip->i_inode.i_mode;
1584 int error;
1585
1586 error = gfs2_rindex_update(sdp);
1587 if (error)
1588 return error;
1589
1590 if (odip != ndip) {
1591 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1592 0, &r_gh);
1593 if (error)
1594 goto out;
1595
1596 if (S_ISDIR(old_mode)) {
1597 /* don't move a directory into its subdir */
1598 error = gfs2_ok_to_move(oip, ndip);
1599 if (error)
1600 goto out_gunlock_r;
1601 }
1602
1603 if (S_ISDIR(new_mode)) {
1604 /* don't move a directory into its subdir */
1605 error = gfs2_ok_to_move(nip, odip);
1606 if (error)
1607 goto out_gunlock_r;
1608 }
1609 }
1610
1611 num_gh = 1;
1612 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1613 if (odip != ndip) {
1614 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1615 num_gh++;
1616 }
1617 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1618 num_gh++;
1619
1620 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1621 num_gh++;
1622
1623 for (x = 0; x < num_gh; x++) {
1624 error = gfs2_glock_nq(ghs + x);
1625 if (error)
1626 goto out_gunlock;
1627 }
1628
1629 error = -ENOENT;
1630 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1631 goto out_gunlock;
1632
1633 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1634 if (error)
1635 goto out_gunlock;
1636 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1637 if (error)
1638 goto out_gunlock;
1639
1640 if (S_ISDIR(old_mode)) {
1641 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1642 if (error)
1643 goto out_gunlock;
1644 }
1645 if (S_ISDIR(new_mode)) {
1646 error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
1647 if (error)
1648 goto out_gunlock;
1649 }
1650 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1651 if (error)
1652 goto out_gunlock;
1653
1654 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1655 if (error)
1656 goto out_end_trans;
1657
1658 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1659 if (error)
1660 goto out_end_trans;
1661
1662 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1663 IF2DT(old_mode));
1664 if (error)
1665 goto out_end_trans;
1666
1667 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1668 IF2DT(new_mode));
1669 if (error)
1670 goto out_end_trans;
1671
1672 if (odip != ndip) {
1673 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1674 inc_nlink(&odip->i_inode);
1675 drop_nlink(&ndip->i_inode);
1676 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1677 inc_nlink(&ndip->i_inode);
1678 drop_nlink(&odip->i_inode);
1679 }
1680 }
1681 mark_inode_dirty(&ndip->i_inode);
1682 if (odip != ndip)
1683 mark_inode_dirty(&odip->i_inode);
1684
1685out_end_trans:
1686 gfs2_trans_end(sdp);
1687out_gunlock:
1688 while (x--) {
1689 gfs2_glock_dq(ghs + x);
1690 gfs2_holder_uninit(ghs + x);
1691 }
1692out_gunlock_r:
1693 if (r_gh.gh_gl)
1694 gfs2_glock_dq_uninit(&r_gh);
1695out:
1696 return error;
1697}
1698
1699static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
1700 struct inode *ndir, struct dentry *ndentry,
1701 unsigned int flags)
1702{
1703 flags &= ~RENAME_NOREPLACE;
1704
1705 if (flags & ~RENAME_EXCHANGE)
1706 return -EINVAL;
1707
1708 if (flags & RENAME_EXCHANGE)
1709 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1710
1711 return gfs2_rename(odir, odentry, ndir, ndentry);
1712}
1713
1714/**
David Teiglandb3b94fa2006-01-16 16:50:04 +00001715 * gfs2_follow_link - Follow a symbolic link
1716 * @dentry: The dentry of the link
1717 * @nd: Data that we pass to vfs_follow_link()
1718 *
Al Viroc177c2a2010-01-14 00:59:16 -05001719 * This can handle symlinks of any size.
David Teiglandb3b94fa2006-01-16 16:50:04 +00001720 *
1721 * Returns: 0 on success or error code
1722 */
1723
Al Viro6e771372015-05-02 13:37:52 -04001724static const char *gfs2_follow_link(struct dentry *dentry, void **cookie)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001725{
David Howells2b0143b2015-03-17 22:25:59 +00001726 struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
Al Viroc177c2a2010-01-14 00:59:16 -05001727 struct gfs2_holder i_gh;
1728 struct buffer_head *dibh;
Steven Whitehouse160b4022011-05-13 10:34:59 +01001729 unsigned int size;
Al Viroc177c2a2010-01-14 00:59:16 -05001730 char *buf;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001731 int error;
1732
Al Viroc177c2a2010-01-14 00:59:16 -05001733 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1734 error = gfs2_glock_nq(&i_gh);
1735 if (error) {
1736 gfs2_holder_uninit(&i_gh);
Al Viro680baac2015-05-02 13:32:22 -04001737 return ERR_PTR(error);
Al Viroc177c2a2010-01-14 00:59:16 -05001738 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001739
Steven Whitehousea2e0f792010-08-11 09:53:11 +01001740 size = (unsigned int)i_size_read(&ip->i_inode);
1741 if (size == 0) {
Al Viroc177c2a2010-01-14 00:59:16 -05001742 gfs2_consist_inode(ip);
1743 buf = ERR_PTR(-EIO);
1744 goto out;
1745 }
1746
1747 error = gfs2_meta_inode_buffer(ip, &dibh);
1748 if (error) {
1749 buf = ERR_PTR(error);
1750 goto out;
1751 }
1752
Steven Whitehouse160b4022011-05-13 10:34:59 +01001753 buf = kzalloc(size + 1, GFP_NOFS);
Al Viroc177c2a2010-01-14 00:59:16 -05001754 if (!buf)
1755 buf = ERR_PTR(-ENOMEM);
1756 else
Steven Whitehouse160b4022011-05-13 10:34:59 +01001757 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
Al Viroc177c2a2010-01-14 00:59:16 -05001758 brelse(dibh);
1759out:
1760 gfs2_glock_dq_uninit(&i_gh);
Al Viro680baac2015-05-02 13:32:22 -04001761 if (!IS_ERR(buf))
1762 *cookie = buf;
1763 return buf;
Al Viroc177c2a2010-01-14 00:59:16 -05001764}
1765
David Teiglandb3b94fa2006-01-16 16:50:04 +00001766/**
1767 * gfs2_permission -
Steven Whitehouse75d5cfb2011-01-19 09:42:40 +00001768 * @inode: The inode
1769 * @mask: The mask to be tested
1770 * @flags: Indicates whether this is an RCU path walk or not
David Teiglandb3b94fa2006-01-16 16:50:04 +00001771 *
Steven Whitehouse300c7d72006-11-27 09:55:28 -05001772 * This may be called from the VFS directly, or from within GFS2 with the
1773 * inode locked, so we look to see if the glock is already locked and only
1774 * lock the glock if its not already been done.
1775 *
David Teiglandb3b94fa2006-01-16 16:50:04 +00001776 * Returns: errno
1777 */
1778
Al Viro10556cb2011-06-20 19:28:19 -04001779int gfs2_permission(struct inode *inode, int mask)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001780{
Nick Pigginb74c79e2011-01-07 17:49:58 +11001781 struct gfs2_inode *ip;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001782 struct gfs2_holder i_gh;
1783 int error;
Steven Whitehouse300c7d72006-11-27 09:55:28 -05001784 int unlock = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001785
Nick Pigginb74c79e2011-01-07 17:49:58 +11001786
1787 ip = GFS2_I(inode);
Steven Whitehouse7afd88d2008-02-22 16:07:18 +00001788 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
Benjamin Marzinski2e60d762014-11-13 20:42:04 -06001789 if (mask & MAY_NOT_BLOCK)
1790 return -ECHILD;
1791 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1792 if (error)
1793 return error;
1794 unlock = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001795 }
1796
Miklos Szeredif58ba882008-07-02 21:12:01 +02001797 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1798 error = -EACCES;
1799 else
Al Viro2830ba72011-06-20 19:16:29 -04001800 error = generic_permission(inode, mask);
Steven Whitehouse300c7d72006-11-27 09:55:28 -05001801 if (unlock)
1802 gfs2_glock_dq_uninit(&i_gh);
1803
David Teiglandb3b94fa2006-01-16 16:50:04 +00001804 return error;
1805}
1806
Steven Whitehouseab9bbda2011-08-15 14:20:36 +01001807static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
Steven Whitehouse194c0112011-05-09 14:06:38 +01001808{
Steven Whitehouse194c0112011-05-09 14:06:38 +01001809 setattr_copy(inode, attr);
1810 mark_inode_dirty(inode);
Steven Whitehouse194c0112011-05-09 14:06:38 +01001811 return 0;
1812}
1813
1814/**
1815 * gfs2_setattr_simple -
1816 * @ip:
1817 * @attr:
1818 *
1819 * Returns: errno
1820 */
1821
Steven Whitehouseab9bbda2011-08-15 14:20:36 +01001822int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
Steven Whitehouse194c0112011-05-09 14:06:38 +01001823{
1824 int error;
1825
1826 if (current->journal_info)
Steven Whitehouseab9bbda2011-08-15 14:20:36 +01001827 return __gfs2_setattr_simple(inode, attr);
Steven Whitehouse194c0112011-05-09 14:06:38 +01001828
Steven Whitehouseab9bbda2011-08-15 14:20:36 +01001829 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
Steven Whitehouse194c0112011-05-09 14:06:38 +01001830 if (error)
1831 return error;
1832
Steven Whitehouseab9bbda2011-08-15 14:20:36 +01001833 error = __gfs2_setattr_simple(inode, attr);
1834 gfs2_trans_end(GFS2_SB(inode));
Steven Whitehouse194c0112011-05-09 14:06:38 +01001835 return error;
1836}
1837
David Teiglandb3b94fa2006-01-16 16:50:04 +00001838static int setattr_chown(struct inode *inode, struct iattr *attr)
1839{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001840 struct gfs2_inode *ip = GFS2_I(inode);
1841 struct gfs2_sbd *sdp = GFS2_SB(inode);
Eric W. Biederman7c06b5d2013-01-31 20:27:54 -08001842 kuid_t ouid, nuid;
1843 kgid_t ogid, ngid;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001844 int error;
Abhi Dasb8fbf472015-03-18 12:03:41 -05001845 struct gfs2_alloc_parms ap;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001846
Steven Whitehouse2933f922006-11-01 13:23:29 -05001847 ouid = inode->i_uid;
1848 ogid = inode->i_gid;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001849 nuid = attr->ia_uid;
1850 ngid = attr->ia_gid;
1851
Eric W. Biederman6b24c0d2013-01-31 21:56:13 -08001852 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
Eric W. Biedermanf4108a62013-01-31 17:49:26 -08001853 ouid = nuid = NO_UID_QUOTA_CHANGE;
Eric W. Biederman6b24c0d2013-01-31 21:56:13 -08001854 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
Eric W. Biedermanf4108a62013-01-31 17:49:26 -08001855 ogid = ngid = NO_GID_QUOTA_CHANGE;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001856
Bob Peterson62e96cf2014-01-06 17:16:01 -05001857 error = get_write_access(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001858 if (error)
Bob Peterson5407e242012-05-18 09:28:23 -04001859 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001860
Bob Peterson62e96cf2014-01-06 17:16:01 -05001861 error = gfs2_rs_alloc(ip);
1862 if (error)
1863 goto out;
1864
1865 error = gfs2_rindex_update(sdp);
1866 if (error)
1867 goto out;
1868
1869 error = gfs2_quota_lock(ip, nuid, ngid);
1870 if (error)
1871 goto out;
1872
Abhi Dasb8fbf472015-03-18 12:03:41 -05001873 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1874
Eric W. Biederman6b24c0d2013-01-31 21:56:13 -08001875 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1876 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
Abhi Dasb8fbf472015-03-18 12:03:41 -05001877 error = gfs2_quota_check(ip, nuid, ngid, &ap);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001878 if (error)
1879 goto out_gunlock_q;
1880 }
1881
1882 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1883 if (error)
1884 goto out_gunlock_q;
1885
Steven Whitehouseab9bbda2011-08-15 14:20:36 +01001886 error = gfs2_setattr_simple(inode, attr);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001887 if (error)
1888 goto out_end_trans;
1889
Eric W. Biederman6b24c0d2013-01-31 21:56:13 -08001890 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1891 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
Abhi Das39a72582015-06-02 11:02:24 -05001892 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
Abhi Dasb8fbf472015-03-18 12:03:41 -05001893 gfs2_quota_change(ip, ap.target, nuid, ngid);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001894 }
1895
Steven Whitehousea91ea692006-09-04 12:04:26 -04001896out_end_trans:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001897 gfs2_trans_end(sdp);
Steven Whitehousea91ea692006-09-04 12:04:26 -04001898out_gunlock_q:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001899 gfs2_quota_unlock(ip);
Bob Peterson62e96cf2014-01-06 17:16:01 -05001900out:
1901 put_write_access(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001902 return error;
1903}
1904
1905/**
1906 * gfs2_setattr - Change attributes on an inode
1907 * @dentry: The dentry which is changing
1908 * @attr: The structure describing the change
1909 *
1910 * The VFS layer wants to change one or more of an inodes attributes. Write
1911 * that change out to disk.
1912 *
1913 * Returns: errno
1914 */
1915
1916static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1917{
David Howells2b0143b2015-03-17 22:25:59 +00001918 struct inode *inode = d_inode(dentry);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001919 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001920 struct gfs2_holder i_gh;
1921 int error;
1922
Bob Peterson0a305e42012-06-06 11:17:59 +01001923 error = gfs2_rs_alloc(ip);
1924 if (error)
1925 return error;
1926
David Teiglandb3b94fa2006-01-16 16:50:04 +00001927 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1928 if (error)
1929 return error;
1930
1931 error = -EPERM;
1932 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1933 goto out;
1934
1935 error = inode_change_ok(inode, attr);
1936 if (error)
1937 goto out;
1938
1939 if (attr->ia_valid & ATTR_SIZE)
Steven Whitehouseff8f33c2010-08-11 09:37:53 +01001940 error = gfs2_setattr_size(inode, attr->ia_size);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001941 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1942 error = setattr_chown(inode, attr);
Christoph Hellwige01580b2013-12-20 05:16:52 -08001943 else {
Steven Whitehouseab9bbda2011-08-15 14:20:36 +01001944 error = gfs2_setattr_simple(inode, attr);
Christoph Hellwige01580b2013-12-20 05:16:52 -08001945 if (!error && attr->ia_valid & ATTR_MODE)
1946 error = posix_acl_chmod(inode, inode->i_mode);
1947 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001948
Steven Whitehousea91ea692006-09-04 12:04:26 -04001949out:
David Teiglandb3b94fa2006-01-16 16:50:04 +00001950 if (!error)
1951 mark_inode_dirty(inode);
Steven Whitehouseab9bbda2011-08-15 14:20:36 +01001952 gfs2_glock_dq_uninit(&i_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001953 return error;
1954}
1955
1956/**
1957 * gfs2_getattr - Read out an inode's attributes
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001958 * @mnt: The vfsmount the inode is being accessed from
David Teiglandb3b94fa2006-01-16 16:50:04 +00001959 * @dentry: The dentry to stat
1960 * @stat: The inode's stats
1961 *
Steven Whitehousedcf3dd82006-11-27 10:12:05 -05001962 * This may be called from the VFS directly, or from within GFS2 with the
1963 * inode locked, so we look to see if the glock is already locked and only
1964 * lock the glock if its not already been done. Note that its the NFS
1965 * readdirplus operation which causes this to be called (from filldir)
1966 * with the glock already held.
1967 *
David Teiglandb3b94fa2006-01-16 16:50:04 +00001968 * Returns: errno
1969 */
1970
1971static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1972 struct kstat *stat)
1973{
David Howells2b0143b2015-03-17 22:25:59 +00001974 struct inode *inode = d_inode(dentry);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001975 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001976 struct gfs2_holder gh;
1977 int error;
Steven Whitehousedcf3dd82006-11-27 10:12:05 -05001978 int unlock = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001979
Steven Whitehouse7afd88d2008-02-22 16:07:18 +00001980 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
Benjamin Marzinski2e60d762014-11-13 20:42:04 -06001981 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1982 if (error)
1983 return error;
1984 unlock = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001985 }
1986
Steven Whitehousedcf3dd82006-11-27 10:12:05 -05001987 generic_fillattr(inode, stat);
Steven Whitehoused7c103d2007-01-25 17:14:59 +00001988 if (unlock)
Steven Whitehousedcf3dd82006-11-27 10:12:05 -05001989 gfs2_glock_dq_uninit(&gh);
1990
1991 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001992}
1993
1994static int gfs2_setxattr(struct dentry *dentry, const char *name,
1995 const void *data, size_t size, int flags)
1996{
David Howells2b0143b2015-03-17 22:25:59 +00001997 struct inode *inode = d_inode(dentry);
Steven Whitehouse40b78a32009-08-26 18:41:32 +01001998 struct gfs2_inode *ip = GFS2_I(inode);
1999 struct gfs2_holder gh;
2000 int ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +00002001
Steven Whitehouse40b78a32009-08-26 18:41:32 +01002002 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
2003 ret = gfs2_glock_nq(&gh);
2004 if (ret == 0) {
Steven Whitehouse645b2cc2012-07-26 14:15:17 +01002005 ret = gfs2_rs_alloc(ip);
2006 if (ret == 0)
2007 ret = generic_setxattr(dentry, name, data, size, flags);
Steven Whitehouse40b78a32009-08-26 18:41:32 +01002008 gfs2_glock_dq(&gh);
2009 }
2010 gfs2_holder_uninit(&gh);
2011 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +00002012}
2013
2014static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
2015 void *data, size_t size)
2016{
David Howells2b0143b2015-03-17 22:25:59 +00002017 struct inode *inode = d_inode(dentry);
Steven Whitehouse40b78a32009-08-26 18:41:32 +01002018 struct gfs2_inode *ip = GFS2_I(inode);
2019 struct gfs2_holder gh;
2020 int ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +00002021
Steven Whitehouse7bd9ee52013-08-16 21:10:28 +01002022 /* For selinux during lookup */
2023 if (gfs2_glock_is_locked_by_me(ip->i_gl))
2024 return generic_getxattr(dentry, name, data, size);
2025
Steven Whitehouse40b78a32009-08-26 18:41:32 +01002026 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2027 ret = gfs2_glock_nq(&gh);
2028 if (ret == 0) {
2029 ret = generic_getxattr(dentry, name, data, size);
2030 gfs2_glock_dq(&gh);
2031 }
2032 gfs2_holder_uninit(&gh);
2033 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +00002034}
2035
2036static int gfs2_removexattr(struct dentry *dentry, const char *name)
2037{
David Howells2b0143b2015-03-17 22:25:59 +00002038 struct inode *inode = d_inode(dentry);
Steven Whitehouse40b78a32009-08-26 18:41:32 +01002039 struct gfs2_inode *ip = GFS2_I(inode);
2040 struct gfs2_holder gh;
2041 int ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +00002042
Steven Whitehouse40b78a32009-08-26 18:41:32 +01002043 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
2044 ret = gfs2_glock_nq(&gh);
2045 if (ret == 0) {
Steven Whitehouse645b2cc2012-07-26 14:15:17 +01002046 ret = gfs2_rs_alloc(ip);
2047 if (ret == 0)
2048 ret = generic_removexattr(dentry, name);
Steven Whitehouse40b78a32009-08-26 18:41:32 +01002049 gfs2_glock_dq(&gh);
2050 }
2051 gfs2_holder_uninit(&gh);
2052 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +00002053}
2054
Steven Whitehousee9079cc2008-10-14 14:43:29 +01002055static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2056 u64 start, u64 len)
2057{
2058 struct gfs2_inode *ip = GFS2_I(inode);
2059 struct gfs2_holder gh;
2060 int ret;
2061
2062 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
2063 if (ret)
2064 return ret;
2065
2066 mutex_lock(&inode->i_mutex);
2067
2068 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2069 if (ret)
2070 goto out;
2071
2072 if (gfs2_is_stuffed(ip)) {
2073 u64 phys = ip->i_no_addr << inode->i_blkbits;
2074 u64 size = i_size_read(inode);
2075 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
2076 FIEMAP_EXTENT_DATA_INLINE;
2077 phys += sizeof(struct gfs2_dinode);
2078 phys += start;
2079 if (start + len > size)
2080 len = size - start;
2081 if (start < size)
2082 ret = fiemap_fill_next_extent(fieinfo, start, phys,
2083 len, flags);
2084 if (ret == 1)
2085 ret = 0;
2086 } else {
2087 ret = __generic_block_fiemap(inode, fieinfo, start, len,
2088 gfs2_block_map);
2089 }
2090
2091 gfs2_glock_dq_uninit(&gh);
2092out:
2093 mutex_unlock(&inode->i_mutex);
2094 return ret;
2095}
2096
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -08002097const struct inode_operations gfs2_file_iops = {
Al Viroe6305c42008-07-15 21:03:57 -04002098 .permission = gfs2_permission,
David Teiglandb3b94fa2006-01-16 16:50:04 +00002099 .setattr = gfs2_setattr,
2100 .getattr = gfs2_getattr,
2101 .setxattr = gfs2_setxattr,
2102 .getxattr = gfs2_getxattr,
2103 .listxattr = gfs2_listxattr,
2104 .removexattr = gfs2_removexattr,
Steven Whitehousee9079cc2008-10-14 14:43:29 +01002105 .fiemap = gfs2_fiemap,
Christoph Hellwig4e34e712011-07-23 17:37:31 +02002106 .get_acl = gfs2_get_acl,
Christoph Hellwige01580b2013-12-20 05:16:52 -08002107 .set_acl = gfs2_set_acl,
David Teiglandb3b94fa2006-01-16 16:50:04 +00002108};
2109
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -08002110const struct inode_operations gfs2_dir_iops = {
David Teiglandb3b94fa2006-01-16 16:50:04 +00002111 .create = gfs2_create,
2112 .lookup = gfs2_lookup,
2113 .link = gfs2_link,
2114 .unlink = gfs2_unlink,
2115 .symlink = gfs2_symlink,
2116 .mkdir = gfs2_mkdir,
Steven Whitehouse855d23c2011-05-09 16:42:37 +01002117 .rmdir = gfs2_unlink,
David Teiglandb3b94fa2006-01-16 16:50:04 +00002118 .mknod = gfs2_mknod,
Benjamin Marzinskia63b7bb2015-05-05 12:12:19 -05002119 .rename2 = gfs2_rename2,
Al Viroe6305c42008-07-15 21:03:57 -04002120 .permission = gfs2_permission,
David Teiglandb3b94fa2006-01-16 16:50:04 +00002121 .setattr = gfs2_setattr,
2122 .getattr = gfs2_getattr,
2123 .setxattr = gfs2_setxattr,
2124 .getxattr = gfs2_getxattr,
2125 .listxattr = gfs2_listxattr,
2126 .removexattr = gfs2_removexattr,
Steven Whitehousee9079cc2008-10-14 14:43:29 +01002127 .fiemap = gfs2_fiemap,
Christoph Hellwig4e34e712011-07-23 17:37:31 +02002128 .get_acl = gfs2_get_acl,
Christoph Hellwige01580b2013-12-20 05:16:52 -08002129 .set_acl = gfs2_set_acl,
Steven Whitehouse6d4ade92013-06-14 11:17:15 +01002130 .atomic_open = gfs2_atomic_open,
David Teiglandb3b94fa2006-01-16 16:50:04 +00002131};
2132
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -08002133const struct inode_operations gfs2_symlink_iops = {
Al Viroc177c2a2010-01-14 00:59:16 -05002134 .readlink = generic_readlink,
David Teiglandb3b94fa2006-01-16 16:50:04 +00002135 .follow_link = gfs2_follow_link,
Al Viro87dc8002013-09-16 10:30:04 -04002136 .put_link = kfree_put_link,
Al Viroe6305c42008-07-15 21:03:57 -04002137 .permission = gfs2_permission,
David Teiglandb3b94fa2006-01-16 16:50:04 +00002138 .setattr = gfs2_setattr,
2139 .getattr = gfs2_getattr,
2140 .setxattr = gfs2_setxattr,
2141 .getxattr = gfs2_getxattr,
2142 .listxattr = gfs2_listxattr,
2143 .removexattr = gfs2_removexattr,
Steven Whitehousee9079cc2008-10-14 14:43:29 +01002144 .fiemap = gfs2_fiemap,
David Teiglandb3b94fa2006-01-16 16:50:04 +00002145};
2146