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2024-09-20 cf4ce59b3b70238352c7f1729f0f7223214828ad 
 kernel/fs/ubifs/dir.c
....@@ -1,20 +1,8 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /* * This file is part of UBIFS.
23  *
34  * Copyright (C) 2006-2008 Nokia Corporation.
45  * Copyright (C) 2006, 2007 University of Szeged, Hungary
5
- *
6
- * This program is free software; you can redistribute it and/or modify it
7
- * under the terms of the GNU General Public License version 2 as published by
8
- * the Free Software Foundation.
9
- *
10
- * This program is distributed in the hope that it will be useful, but WITHOUT
11
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13
- * more details.
14
- *
15
- * You should have received a copy of the GNU General Public License along with
16
- * this program; if not, write to the Free Software Foundation, Inc., 51
17
- * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
186  *
197  * Authors: Artem Bityutskiy (Битюцкий Артём)
208  *          Adrian Hunter
....@@ -93,19 +81,6 @@
9381 	struct ubifs_inode *ui;
9482 	bool encrypted = false;
9583 
96
-	if (ubifs_crypt_is_encrypted(dir)) {
97
-		err = fscrypt_get_encryption_info(dir);
98
-		if (err) {
99
-			ubifs_err(c, "fscrypt_get_encryption_info failed: %i", err);
100
-			return ERR_PTR(err);
101
-		}
102
-
103
-		if (!fscrypt_has_encryption_key(dir))
104
-			return ERR_PTR(-EPERM);
105
-
106
-		encrypted = true;
107
-	}
108
-
10984 	inode = new_inode(c->vfs_sb);
11085 	ui = ubifs_inode(inode);
11186 	if (!inode)
....@@ -123,6 +98,12 @@
12398 	inode->i_mtime = inode->i_atime = inode->i_ctime =
12499 			 current_time(inode);
125100 	inode->i_mapping->nrpages = 0;
101
+
102
+	err = fscrypt_prepare_new_inode(dir, inode, &encrypted);
103
+	if (err) {
104
+		ubifs_err(c, "fscrypt_prepare_new_inode failed: %i", err);
105
+		goto out_iput;
106
+	}
126107 
127108 	switch (mode & S_IFMT) {
128109 	case S_IFREG:
....@@ -143,7 +124,6 @@
143124 	case S_IFBLK:
144125 	case S_IFCHR:
145126 		inode->i_op  = &ubifs_file_inode_operations;
146
-		encrypted = false;
147127 		break;
148128 	default:
149129 		BUG();
....@@ -163,9 +143,8 @@
163143 		if (c->highest_inum >= INUM_WATERMARK) {
164144 			spin_unlock(&c->cnt_lock);
165145 			ubifs_err(c, "out of inode numbers");
166
-			make_bad_inode(inode);
167
-			iput(inode);
168
-			return ERR_PTR(-EINVAL);
146
+			err = -EINVAL;
147
+			goto out_iput;
169148 		}
170149 		ubifs_warn(c, "running out of inode numbers (current %lu, max %u)",
171150 			   (unsigned long)c->highest_inum, INUM_WATERMARK);
....@@ -183,16 +162,19 @@
183162 	spin_unlock(&c->cnt_lock);
184163 
185164 	if (encrypted) {
186
-		err = fscrypt_inherit_context(dir, inode, &encrypted, true);
165
+		err = fscrypt_set_context(inode, NULL);
187166 		if (err) {
188
-			ubifs_err(c, "fscrypt_inherit_context failed: %i", err);
189
-			make_bad_inode(inode);
190
-			iput(inode);
191
-			return ERR_PTR(err);
167
+			ubifs_err(c, "fscrypt_set_context failed: %i", err);
168
+			goto out_iput;
192169 		}
193170 	}
194171 
195172 	return inode;
173
+
174
+out_iput:
175
+	make_bad_inode(inode);
176
+	iput(inode);
177
+	return ERR_PTR(err);
196178 }
197179 
198180 static int dbg_check_name(const struct ubifs_info *c,
....@@ -208,7 +190,6 @@
208190 	return 0;
209191 }
210192 
211
-static void ubifs_set_d_ops(struct inode *dir, struct dentry *dentry);
212193 static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry,
213194 				   unsigned int flags)
214195 {
....@@ -222,7 +203,7 @@
222203 	dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino);
223204 
224205 	err = fscrypt_prepare_lookup(dir, dentry, &nm);
225
-	ubifs_set_d_ops(dir, dentry);
206
+	generic_set_encrypted_ci_d_ops(dentry);
226207 	if (err == -ENOENT)
227208 		return d_splice_alias(NULL, dentry);
228209 	if (err)
....@@ -275,7 +256,7 @@
275256 		goto done;
276257 	}
277258 
278
-	if (ubifs_crypt_is_encrypted(dir) &&
259
+	if (IS_ENCRYPTED(dir) &&
279260 	    (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
280261 	    !fscrypt_has_permitted_context(dir, inode)) {
281262 		ubifs_warn(c, "Inconsistent encryption contexts: %lu/%lu",
....@@ -373,15 +354,18 @@
373354 {
374355 	struct inode *inode;
375356 	struct ubifs_info *c = dir->i_sb->s_fs_info;
376
-	struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1};
357
+	struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
358
+					.dirtied_ino = 1};
377359 	struct ubifs_budget_req ino_req = { .dirtied_ino = 1 };
378360 	struct ubifs_inode *ui, *dir_ui = ubifs_inode(dir);
379361 	int err, instantiated = 0;
380362 	struct fscrypt_name nm;
381363 
382364 	/*
383
-	 * Budget request settings: new dirty inode, new direntry,
384
-	 * budget for dirtied inode will be released via writeback.
365
+	 * Budget request settings: new inode, new direntry, changing the
366
+	 * parent directory inode.
367
+	 * Allocate budget separately for new dirtied inode, the budget will
368
+	 * be released via writeback.
385369 	 */
386370 
387371 	dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
....@@ -442,6 +426,7 @@
442426 	mutex_unlock(&dir_ui->ui_mutex);
443427 
444428 	ubifs_release_budget(c, &req);
429
+	fscrypt_free_filename(&nm);
445430 
446431 	return 0;
447432 
....@@ -451,6 +436,8 @@
451436 	make_bad_inode(inode);
452437 	if (!instantiated)
453438 		iput(inode);
439
+	else if (whiteout)
440
+		iput(*whiteout);
454441 out_budg:
455442 	ubifs_release_budget(c, &req);
456443 	if (!instantiated)
....@@ -522,7 +509,7 @@
522509 	struct ubifs_dent_node *dent;
523510 	struct inode *dir = file_inode(file);
524511 	struct ubifs_info *c = dir->i_sb->s_fs_info;
525
-	bool encrypted = ubifs_crypt_is_encrypted(dir);
512
+	bool encrypted = IS_ENCRYPTED(dir);
526513 
527514 	dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, ctx->pos);
528515 
....@@ -534,11 +521,11 @@
534521 		return 0;
535522 
536523 	if (encrypted) {
537
-		err = fscrypt_get_encryption_info(dir);
524
+		err = fscrypt_prepare_readdir(dir);
538525 		if (err)
539526 			return err;
540527 
541
-		err = fscrypt_fname_alloc_buffer(dir, UBIFS_MAX_NLEN, &fstr);
528
+		err = fscrypt_fname_alloc_buffer(UBIFS_MAX_NLEN, &fstr);
542529 		if (err)
543530 			return err;
544531 
....@@ -801,13 +788,11 @@
801788 		dentry, inode->i_ino,
802789 		inode->i_nlink, dir->i_ino);
803790 
804
-	if (ubifs_crypt_is_encrypted(dir)) {
805
-		err = fscrypt_get_encryption_info(dir);
806
-		if (err && err != -ENOKEY)
807
-			return err;
808
-	}
809
-
810791 	err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm);
792
+	if (err)
793
+		return err;
794
+
795
+	err = ubifs_purge_xattrs(inode);
811796 	if (err)
812797 		return err;
813798 
....@@ -911,13 +896,11 @@
911896 	if (err)
912897 		return err;
913898 
914
-	if (ubifs_crypt_is_encrypted(dir)) {
915
-		err = fscrypt_get_encryption_info(dir);
916
-		if (err && err != -ENOKEY)
917
-			return err;
918
-	}
919
-
920899 	err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm);
900
+	if (err)
901
+		return err;
902
+
903
+	err = ubifs_purge_xattrs(inode);
921904 	if (err)
922905 		return err;
923906 
....@@ -971,7 +954,8 @@
971954 	struct ubifs_inode *dir_ui = ubifs_inode(dir);
972955 	struct ubifs_info *c = dir->i_sb->s_fs_info;
973956 	int err, sz_change;
974
-	struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1 };
957
+	struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
958
+					.dirtied_ino = 1};
975959 	struct fscrypt_name nm;
976960 
977961 	/*
....@@ -1135,7 +1119,6 @@
11351119 	int err, sz_change, len = strlen(symname);
11361120 	struct fscrypt_str disk_link;
11371121 	struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
1138
-					.new_ino_d = ALIGN(len, 8),
11391122 					.dirtied_ino = 1 };
11401123 	struct fscrypt_name nm;
11411124 
....@@ -1151,6 +1134,7 @@
11511134 	 * Budget request settings: new inode, new direntry and changing parent
11521135 	 * directory inode.
11531136 	 */
1137
+	req.new_ino_d = ALIGN(disk_link.len - 1, 8);
11541138 	err = ubifs_budget_space(c, &req);
11551139 	if (err)
11561140 		return err;
....@@ -1287,7 +1271,7 @@
12871271 	struct ubifs_budget_req ino_req = { .dirtied_ino = 1,
12881272 			.dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) };
12891273 	struct timespec64 time;
1290
-	unsigned int uninitialized_var(saved_nlink);
1274
+	unsigned int saved_nlink;
12911275 	struct fscrypt_name old_nm, new_nm;
12921276 
12931277 	/*
....@@ -1303,8 +1287,15 @@
13031287 		old_dentry, old_inode->i_ino, old_dir->i_ino,
13041288 		new_dentry, new_dir->i_ino, flags);
13051289 
1306
-	if (unlink)
1290
+	if (unlink) {
13071291 		ubifs_assert(c, inode_is_locked(new_inode));
1292
+
1293
+		/* Budget for old inode's data when its nlink > 1. */
1294
+		req.dirtied_ino_d = ALIGN(ubifs_inode(new_inode)->data_len, 8);
1295
+		err = ubifs_purge_xattrs(new_inode);
1296
+		if (err)
1297
+			return err;
1298
+	}
13081299 
13091300 	if (unlink && is_dir) {
13101301 		err = ubifs_check_dir_empty(new_inode);
....@@ -1341,6 +1332,7 @@
13411332 
13421333 	if (flags & RENAME_WHITEOUT) {
13431334 		union ubifs_dev_desc *dev = NULL;
1335
+		struct ubifs_budget_req wht_req;
13441336 
13451337 		dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
13461338 		if (!dev) {
....@@ -1362,6 +1354,23 @@
13621354 		whiteout_ui->data = dev;
13631355 		whiteout_ui->data_len = ubifs_encode_dev(dev, MKDEV(0, 0));
13641356 		ubifs_assert(c, !whiteout_ui->dirty);
1357
+
1358
+		memset(&wht_req, 0, sizeof(struct ubifs_budget_req));
1359
+		wht_req.dirtied_ino = 1;
1360
+		wht_req.dirtied_ino_d = ALIGN(whiteout_ui->data_len, 8);
1361
+		/*
1362
+		 * To avoid deadlock between space budget (holds ui_mutex and
1363
+		 * waits wb work) and writeback work(waits ui_mutex), do space
1364
+		 * budget before ubifs inodes locked.
1365
+		 */
1366
+		err = ubifs_budget_space(c, &wht_req);
1367
+		if (err) {
1368
+			iput(whiteout);
1369
+			goto out_release;
1370
+		}
1371
+
1372
+		/* Add the old_dentry size to the old_dir size. */
1373
+		old_sz -= CALC_DENT_SIZE(fname_len(&old_nm));
13651374 	}
13661375 
13671376 	lock_4_inodes(old_dir, new_dir, new_inode, whiteout);
....@@ -1436,18 +1445,6 @@
14361445 	}
14371446 
14381447 	if (whiteout) {
1439
-		struct ubifs_budget_req wht_req = { .dirtied_ino = 1,
1440
-				.dirtied_ino_d = \
1441
-				ALIGN(ubifs_inode(whiteout)->data_len, 8) };
1442
-
1443
-		err = ubifs_budget_space(c, &wht_req);
1444
-		if (err) {
1445
-			kfree(whiteout_ui->data);
1446
-			whiteout_ui->data_len = 0;
1447
-			iput(whiteout);
1448
-			goto out_release;
1449
-		}
1450
-
14511448 		inc_nlink(whiteout);
14521449 		mark_inode_dirty(whiteout);
14531450 
....@@ -1537,6 +1534,10 @@
15371534 		return err;
15381535 	}
15391536 
1537
+	err = ubifs_budget_space(c, &req);
1538
+	if (err)
1539
+		goto out;
1540
+
15401541 	lock_4_inodes(old_dir, new_dir, NULL, NULL);
15411542 
15421543 	time = current_time(old_dir);
....@@ -1562,6 +1563,7 @@
15621563 	unlock_4_inodes(old_dir, new_dir, NULL, NULL);
15631564 	ubifs_release_budget(c, &req);
15641565 
1566
+out:
15651567 	fscrypt_free_filename(&fst_nm);
15661568 	fscrypt_free_filename(&snd_nm);
15671569 	return err;
....@@ -1645,14 +1647,6 @@
16451647 	return 0;
16461648 }
16471649 
1648
-static int ubifs_dir_open(struct inode *dir, struct file *file)
1649
-{
1650
-	if (ubifs_crypt_is_encrypted(dir))
1651
-		return fscrypt_get_encryption_info(dir) ? -EACCES : 0;
1652
-
1653
-	return 0;
1654
-}
1655
-
16561650 const struct inode_operations ubifs_dir_inode_operations = {
16571651 	.lookup      = ubifs_lookup,
16581652 	.create      = ubifs_create,
....@@ -1668,9 +1662,7 @@
16681662 #ifdef CONFIG_UBIFS_FS_XATTR
16691663 	.listxattr   = ubifs_listxattr,
16701664 #endif
1671
-#ifdef CONFIG_UBIFS_ATIME_SUPPORT
16721665 	.update_time = ubifs_update_time,
1673
-#endif
16741666 	.tmpfile     = ubifs_tmpfile,
16751667 };
16761668 
....@@ -1681,24 +1673,7 @@
16811673 	.iterate_shared = ubifs_readdir,
16821674 	.fsync          = ubifs_fsync,
16831675 	.unlocked_ioctl = ubifs_ioctl,
1684
-	.open		= ubifs_dir_open,
16851676 #ifdef CONFIG_COMPAT
16861677 	.compat_ioctl   = ubifs_compat_ioctl,
16871678 #endif
16881679 };
1689
-
1690
-#ifdef CONFIG_FS_ENCRYPTION
1691
-static const struct dentry_operations ubifs_encrypted_dentry_ops = {
1692
-	.d_revalidate = fscrypt_d_revalidate,
1693
-};
1694
-#endif
1695
-
1696
-static void ubifs_set_d_ops(struct inode *dir, struct dentry *dentry)
1697
-{
1698
-#ifdef CONFIG_FS_ENCRYPTION
1699
-	if (dentry->d_flags & DCACHE_ENCRYPTED_NAME) {
1700
-		d_set_d_op(dentry, &ubifs_encrypted_dentry_ops);
1701
-		return;
1702
-	}
1703
-#endif
1704
-}