blob: 491f9ee4040e262b023655ebd5de4e2e92c50a18 [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001// SPDX-License-Identifier: GPL-2.0
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002/*
Mingming Cao617ba132006-10-11 01:20:53 -07003 * linux/fs/ext4/xattr.c
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004 *
5 * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
6 *
7 * Fix by Harrison Xing <harrison@mountainviewdata.com>.
Mingming Cao617ba132006-10-11 01:20:53 -07008 * Ext4 code with a lot of help from Eric Jarman <ejarman@acm.org>.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07009 * Extended attributes for symlinks and special files added per
10 * suggestion of Luka Renko <luka.renko@hermes.si>.
11 * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>,
12 * Red Hat Inc.
13 * ea-in-inode support by Alex Tomas <alex@clusterfs.com> aka bzzz
14 * and Andreas Gruenbacher <agruen@suse.de>.
15 */
16
17/*
18 * Extended attributes are stored directly in inodes (on file systems with
19 * inodes bigger than 128 bytes) and on additional disk blocks. The i_file_acl
20 * field contains the block number if an inode uses an additional block. All
21 * attributes must fit in the inode and one additional block. Blocks that
22 * contain the identical set of attributes may be shared among several inodes.
23 * Identical blocks are detected by keeping a cache of blocks that have
24 * recently been accessed.
25 *
26 * The attributes in inodes and on blocks have a different header; the entries
27 * are stored in the same format:
28 *
29 * +------------------+
30 * | header |
31 * | entry 1 | |
32 * | entry 2 | | growing downwards
33 * | entry 3 | v
34 * | four null bytes |
35 * | . . . |
36 * | value 1 | ^
37 * | value 3 | | growing upwards
38 * | value 2 | |
39 * +------------------+
40 *
41 * The header is followed by multiple entry descriptors. In disk blocks, the
42 * entry descriptors are kept sorted. In inodes, they are unsorted. The
43 * attribute values are aligned to the end of the block in no specific order.
44 *
45 * Locking strategy
46 * ----------------
Mingming Cao617ba132006-10-11 01:20:53 -070047 * EXT4_I(inode)->i_file_acl is protected by EXT4_I(inode)->xattr_sem.
Dave Kleikampac27a0e2006-10-11 01:20:50 -070048 * EA blocks are only changed if they are exclusive to an inode, so
49 * holding xattr_sem also means that nothing but the EA block's reference
50 * count can change. Multiple writers to the same block are synchronized
51 * by the buffer lock.
52 */
53
54#include <linux/init.h>
55#include <linux/fs.h>
56#include <linux/slab.h>
Jan Kara7a2508e2016-02-22 22:35:22 -050057#include <linux/mbcache.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070058#include <linux/quotaops.h>
Jeff Laytonee73f9a2018-01-09 08:21:39 -050059#include <linux/iversion.h>
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040060#include "ext4_jbd2.h"
61#include "ext4.h"
Dave Kleikampac27a0e2006-10-11 01:20:50 -070062#include "xattr.h"
63#include "acl.h"
64
Mingming Cao617ba132006-10-11 01:20:53 -070065#ifdef EXT4_XATTR_DEBUG
Joe Perchesd74f3d22016-10-15 09:57:31 -040066# define ea_idebug(inode, fmt, ...) \
67 printk(KERN_DEBUG "inode %s:%lu: " fmt "\n", \
68 inode->i_sb->s_id, inode->i_ino, ##__VA_ARGS__)
69# define ea_bdebug(bh, fmt, ...) \
70 printk(KERN_DEBUG "block %pg:%lu: " fmt "\n", \
71 bh->b_bdev, (unsigned long)bh->b_blocknr, ##__VA_ARGS__)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070072#else
Joe Perchesace36ad2012-03-19 23:11:43 -040073# define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
74# define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070075#endif
76
Tahsin Erdogan47387402017-06-22 11:28:55 -040077static void ext4_xattr_block_cache_insert(struct mb_cache *,
78 struct buffer_head *);
79static struct buffer_head *
80ext4_xattr_block_cache_find(struct inode *, struct ext4_xattr_header *,
81 struct mb_cache_entry **);
Tahsin Erdoganb9fc7612017-06-22 11:53:15 -040082static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value,
83 size_t value_count);
Tahsin Erdogandaf83282017-06-22 11:52:03 -040084static void ext4_xattr_rehash(struct ext4_xattr_header *);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070085
Eric Biggersd6006182017-04-29 23:47:50 -040086static const struct xattr_handler * const ext4_xattr_handler_map[] = {
Mingming Cao617ba132006-10-11 01:20:53 -070087 [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler,
Theodore Ts'o03010a32008-10-10 20:02:48 -040088#ifdef CONFIG_EXT4_FS_POSIX_ACL
Christoph Hellwig64e178a2013-12-20 05:16:44 -080089 [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler,
90 [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070091#endif
Mingming Cao617ba132006-10-11 01:20:53 -070092 [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler,
Theodore Ts'o03010a32008-10-10 20:02:48 -040093#ifdef CONFIG_EXT4_FS_SECURITY
Mingming Cao617ba132006-10-11 01:20:53 -070094 [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070095#endif
96};
97
Stephen Hemminger11e27522010-05-13 17:53:18 -070098const struct xattr_handler *ext4_xattr_handlers[] = {
Mingming Cao617ba132006-10-11 01:20:53 -070099 &ext4_xattr_user_handler,
100 &ext4_xattr_trusted_handler,
Theodore Ts'o03010a32008-10-10 20:02:48 -0400101#ifdef CONFIG_EXT4_FS_POSIX_ACL
Christoph Hellwig64e178a2013-12-20 05:16:44 -0800102 &posix_acl_access_xattr_handler,
103 &posix_acl_default_xattr_handler,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700104#endif
Theodore Ts'o03010a32008-10-10 20:02:48 -0400105#ifdef CONFIG_EXT4_FS_SECURITY
Mingming Cao617ba132006-10-11 01:20:53 -0700106 &ext4_xattr_security_handler,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700107#endif
108 NULL
109};
110
Tahsin Erdogan47387402017-06-22 11:28:55 -0400111#define EA_BLOCK_CACHE(inode) (((struct ext4_sb_info *) \
112 inode->i_sb->s_fs_info)->s_ea_block_cache)
T Makphaibulchoke9c191f72014-03-18 19:24:49 -0400113
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400114#define EA_INODE_CACHE(inode) (((struct ext4_sb_info *) \
115 inode->i_sb->s_fs_info)->s_ea_inode_cache)
116
Tahsin Erdogan30a7eb92017-06-22 11:42:09 -0400117static int
118ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array,
119 struct inode *inode);
120
Tahsin Erdogan33d201e2017-06-21 21:17:10 -0400121#ifdef CONFIG_LOCKDEP
122void ext4_xattr_inode_set_class(struct inode *ea_inode)
123{
124 lockdep_set_subclass(&ea_inode->i_rwsem, 1);
125}
126#endif
127
Darrick J. Wongcc8e94f2012-04-29 18:43:10 -0400128static __le32 ext4_xattr_block_csum(struct inode *inode,
129 sector_t block_nr,
130 struct ext4_xattr_header *hdr)
131{
132 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
Theodore Ts'od6a77102013-04-09 23:59:55 -0400133 __u32 csum;
Theodore Ts'od6a77102013-04-09 23:59:55 -0400134 __le64 dsk_block_nr = cpu_to_le64(block_nr);
Daeho Jeongb47820e2016-07-03 17:51:39 -0400135 __u32 dummy_csum = 0;
136 int offset = offsetof(struct ext4_xattr_header, h_checksum);
Darrick J. Wongcc8e94f2012-04-29 18:43:10 -0400137
Theodore Ts'od6a77102013-04-09 23:59:55 -0400138 csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr,
139 sizeof(dsk_block_nr));
Daeho Jeongb47820e2016-07-03 17:51:39 -0400140 csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset);
141 csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum));
142 offset += sizeof(dummy_csum);
143 csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset,
144 EXT4_BLOCK_SIZE(inode->i_sb) - offset);
Tao Ma41eb70d2012-07-09 16:29:27 -0400145
Darrick J. Wongcc8e94f2012-04-29 18:43:10 -0400146 return cpu_to_le32(csum);
147}
148
149static int ext4_xattr_block_csum_verify(struct inode *inode,
Theodore Ts'odac7a4b2017-03-25 17:22:47 -0400150 struct buffer_head *bh)
Darrick J. Wongcc8e94f2012-04-29 18:43:10 -0400151{
Theodore Ts'odac7a4b2017-03-25 17:22:47 -0400152 struct ext4_xattr_header *hdr = BHDR(bh);
153 int ret = 1;
154
155 if (ext4_has_metadata_csum(inode->i_sb)) {
156 lock_buffer(bh);
157 ret = (hdr->h_checksum == ext4_xattr_block_csum(inode,
158 bh->b_blocknr, hdr));
159 unlock_buffer(bh);
160 }
161 return ret;
Darrick J. Wongcc8e94f2012-04-29 18:43:10 -0400162}
163
164static void ext4_xattr_block_csum_set(struct inode *inode,
Theodore Ts'odac7a4b2017-03-25 17:22:47 -0400165 struct buffer_head *bh)
Darrick J. Wongcc8e94f2012-04-29 18:43:10 -0400166{
Theodore Ts'odac7a4b2017-03-25 17:22:47 -0400167 if (ext4_has_metadata_csum(inode->i_sb))
168 BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode,
169 bh->b_blocknr, BHDR(bh));
Darrick J. Wongcc8e94f2012-04-29 18:43:10 -0400170}
171
Stephen Hemminger11e27522010-05-13 17:53:18 -0700172static inline const struct xattr_handler *
Mingming Cao617ba132006-10-11 01:20:53 -0700173ext4_xattr_handler(int name_index)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700174{
Stephen Hemminger11e27522010-05-13 17:53:18 -0700175 const struct xattr_handler *handler = NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700176
Mingming Cao617ba132006-10-11 01:20:53 -0700177 if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map))
178 handler = ext4_xattr_handler_map[name_index];
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700179 return handler;
180}
181
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700182static int
Eric Biggers2c4f9922017-04-29 23:56:52 -0400183ext4_xattr_check_entries(struct ext4_xattr_entry *entry, void *end,
184 void *value_start)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700185{
Darrick J. Wonga0626e752014-09-16 14:34:59 -0400186 struct ext4_xattr_entry *e = entry;
187
Eric Biggersd7614cc2016-12-01 14:57:29 -0500188 /* Find the end of the names list */
Darrick J. Wonga0626e752014-09-16 14:34:59 -0400189 while (!IS_LAST_ENTRY(e)) {
190 struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700191 if ((void *)next >= end)
Darrick J. Wong6a797d22015-10-17 16:16:04 -0400192 return -EFSCORRUPTED;
Theodore Ts'o7d951782018-08-01 12:36:52 -0400193 if (strnlen(e->e_name, e->e_name_len) != e->e_name_len)
194 return -EFSCORRUPTED;
Darrick J. Wonga0626e752014-09-16 14:34:59 -0400195 e = next;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700196 }
Darrick J. Wonga0626e752014-09-16 14:34:59 -0400197
Eric Biggersd7614cc2016-12-01 14:57:29 -0500198 /* Check the values */
Darrick J. Wonga0626e752014-09-16 14:34:59 -0400199 while (!IS_LAST_ENTRY(entry)) {
Eric Biggersce3fd192018-03-29 14:31:42 -0400200 u32 size = le32_to_cpu(entry->e_value_size);
201
Theodore Ts'o54dd0e02018-03-30 20:04:11 -0400202 if (size > EXT4_XATTR_SIZE_MAX)
Eric Biggersce3fd192018-03-29 14:31:42 -0400203 return -EFSCORRUPTED;
204
205 if (size != 0 && entry->e_value_inum == 0) {
Eric Biggersd7614cc2016-12-01 14:57:29 -0500206 u16 offs = le16_to_cpu(entry->e_value_offs);
Eric Biggersd7614cc2016-12-01 14:57:29 -0500207 void *value;
208
209 /*
210 * The value cannot overlap the names, and the value
211 * with padding cannot extend beyond 'end'. Check both
212 * the padded and unpadded sizes, since the size may
213 * overflow to 0 when adding padding.
214 */
215 if (offs > end - value_start)
216 return -EFSCORRUPTED;
217 value = value_start + offs;
218 if (value < (void *)e + sizeof(u32) ||
219 size > end - value ||
220 EXT4_XATTR_SIZE(size) > end - value)
221 return -EFSCORRUPTED;
222 }
Darrick J. Wonga0626e752014-09-16 14:34:59 -0400223 entry = EXT4_XATTR_NEXT(entry);
224 }
225
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700226 return 0;
227}
228
229static inline int
Theodore Ts'ode05ca82018-03-30 15:42:25 -0400230__ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh,
231 const char *function, unsigned int line)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700232{
Theodore Ts'ode05ca82018-03-30 15:42:25 -0400233 int error = -EFSCORRUPTED;
Darrick J. Wongcc8e94f2012-04-29 18:43:10 -0400234
Mingming Cao617ba132006-10-11 01:20:53 -0700235 if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700236 BHDR(bh)->h_blocks != cpu_to_le32(1))
Theodore Ts'ode05ca82018-03-30 15:42:25 -0400237 goto errout;
Theodore Ts'o513f86d2018-06-13 00:51:28 -0400238 if (buffer_verified(bh))
239 return 0;
240
Theodore Ts'ode05ca82018-03-30 15:42:25 -0400241 error = -EFSBADCRC;
Theodore Ts'odac7a4b2017-03-25 17:22:47 -0400242 if (!ext4_xattr_block_csum_verify(inode, bh))
Theodore Ts'ode05ca82018-03-30 15:42:25 -0400243 goto errout;
Eric Biggers2c4f9922017-04-29 23:56:52 -0400244 error = ext4_xattr_check_entries(BFIRST(bh), bh->b_data + bh->b_size,
245 bh->b_data);
Theodore Ts'ode05ca82018-03-30 15:42:25 -0400246errout:
247 if (error)
248 __ext4_error_inode(inode, function, line, 0,
249 "corrupted xattr block %llu",
250 (unsigned long long) bh->b_blocknr);
251 else
Darrick J. Wongcc8e94f2012-04-29 18:43:10 -0400252 set_buffer_verified(bh);
253 return error;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700254}
255
Theodore Ts'ode05ca82018-03-30 15:42:25 -0400256#define ext4_xattr_check_block(inode, bh) \
257 __ext4_xattr_check_block((inode), (bh), __func__, __LINE__)
258
259
Theodore Ts'o9e92f482016-03-22 16:13:15 -0400260static int
261__xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header,
262 void *end, const char *function, unsigned int line)
263{
Theodore Ts'o9e92f482016-03-22 16:13:15 -0400264 int error = -EFSCORRUPTED;
265
Eric Biggers290ab232016-12-01 14:51:58 -0500266 if (end - (void *)header < sizeof(*header) + sizeof(u32) ||
Eric Biggers19962502016-10-15 09:39:31 -0400267 (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC)))
Theodore Ts'o9e92f482016-03-22 16:13:15 -0400268 goto errout;
Eric Biggers2c4f9922017-04-29 23:56:52 -0400269 error = ext4_xattr_check_entries(IFIRST(header), end, IFIRST(header));
Theodore Ts'o9e92f482016-03-22 16:13:15 -0400270errout:
271 if (error)
272 __ext4_error_inode(inode, function, line, 0,
273 "corrupted in-inode xattr");
274 return error;
275}
276
277#define xattr_check_inode(inode, header, end) \
278 __xattr_check_inode((inode), (header), (end), __func__, __LINE__)
279
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700280static int
Theodore Ts'o9496005d2018-03-30 20:00:56 -0400281xattr_find_entry(struct inode *inode, struct ext4_xattr_entry **pentry,
282 void *end, int name_index, const char *name, int sorted)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700283{
Theodore Ts'o9496005d2018-03-30 20:00:56 -0400284 struct ext4_xattr_entry *entry, *next;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700285 size_t name_len;
286 int cmp = 1;
287
288 if (name == NULL)
289 return -EINVAL;
290 name_len = strlen(name);
Theodore Ts'o9496005d2018-03-30 20:00:56 -0400291 for (entry = *pentry; !IS_LAST_ENTRY(entry); entry = next) {
292 next = EXT4_XATTR_NEXT(entry);
293 if ((void *) next >= end) {
294 EXT4_ERROR_INODE(inode, "corrupted xattr entries");
295 return -EFSCORRUPTED;
296 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700297 cmp = name_index - entry->e_name_index;
298 if (!cmp)
299 cmp = name_len - entry->e_name_len;
300 if (!cmp)
301 cmp = memcmp(name, entry->e_name, name_len);
302 if (cmp <= 0 && (sorted || cmp == 0))
303 break;
304 }
305 *pentry = entry;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700306 return cmp ? -ENODATA : 0;
307}
308
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400309static u32
310ext4_xattr_inode_hash(struct ext4_sb_info *sbi, const void *buffer, size_t size)
311{
312 return ext4_chksum(sbi, sbi->s_csum_seed, buffer, size);
313}
314
315static u64 ext4_xattr_inode_get_ref(struct inode *ea_inode)
316{
317 return ((u64)ea_inode->i_ctime.tv_sec << 32) |
Jeff Laytonee73f9a2018-01-09 08:21:39 -0500318 (u32) inode_peek_iversion_raw(ea_inode);
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400319}
320
321static void ext4_xattr_inode_set_ref(struct inode *ea_inode, u64 ref_count)
322{
323 ea_inode->i_ctime.tv_sec = (u32)(ref_count >> 32);
Jeff Laytonee73f9a2018-01-09 08:21:39 -0500324 inode_set_iversion_raw(ea_inode, ref_count & 0xffffffff);
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400325}
326
327static u32 ext4_xattr_inode_get_hash(struct inode *ea_inode)
328{
329 return (u32)ea_inode->i_atime.tv_sec;
330}
331
332static void ext4_xattr_inode_set_hash(struct inode *ea_inode, u32 hash)
333{
334 ea_inode->i_atime.tv_sec = hash;
335}
336
Andreas Dilgere50e5122017-06-21 21:10:32 -0400337/*
338 * Read the EA value from an inode.
339 */
Tahsin Erdogan909666932017-06-21 21:57:36 -0400340static int ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t size)
Andreas Dilgere50e5122017-06-21 21:10:32 -0400341{
Tahsin Erdogan9699d4f2017-08-06 00:07:01 -0400342 int blocksize = 1 << ea_inode->i_blkbits;
343 int bh_count = (size + blocksize - 1) >> ea_inode->i_blkbits;
344 int tail_size = (size % blocksize) ?: blocksize;
345 struct buffer_head *bhs_inline[8];
346 struct buffer_head **bhs = bhs_inline;
347 int i, ret;
Andreas Dilgere50e5122017-06-21 21:10:32 -0400348
Tahsin Erdogan9699d4f2017-08-06 00:07:01 -0400349 if (bh_count > ARRAY_SIZE(bhs_inline)) {
350 bhs = kmalloc_array(bh_count, sizeof(*bhs), GFP_NOFS);
351 if (!bhs)
352 return -ENOMEM;
Andreas Dilgere50e5122017-06-21 21:10:32 -0400353 }
Tahsin Erdogan9699d4f2017-08-06 00:07:01 -0400354
355 ret = ext4_bread_batch(ea_inode, 0 /* block */, bh_count,
356 true /* wait */, bhs);
357 if (ret)
358 goto free_bhs;
359
360 for (i = 0; i < bh_count; i++) {
361 /* There shouldn't be any holes in ea_inode. */
362 if (!bhs[i]) {
363 ret = -EFSCORRUPTED;
364 goto put_bhs;
365 }
366 memcpy((char *)buf + blocksize * i, bhs[i]->b_data,
367 i < bh_count - 1 ? blocksize : tail_size);
368 }
369 ret = 0;
370put_bhs:
371 for (i = 0; i < bh_count; i++)
372 brelse(bhs[i]);
373free_bhs:
374 if (bhs != bhs_inline)
375 kfree(bhs);
376 return ret;
Andreas Dilgere50e5122017-06-21 21:10:32 -0400377}
378
Tahsin Erdogana6d05672017-08-24 14:25:02 -0400379#define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec)
380
Tahsin Erdoganbab79b02017-06-21 21:49:53 -0400381static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino,
Tahsin Erdogana6d05672017-08-24 14:25:02 -0400382 u32 ea_inode_hash, struct inode **ea_inode)
Andreas Dilgere50e5122017-06-21 21:10:32 -0400383{
Tahsin Erdoganbab79b02017-06-21 21:49:53 -0400384 struct inode *inode;
385 int err;
Andreas Dilgere50e5122017-06-21 21:10:32 -0400386
Theodore Ts'o8a363972018-12-19 12:29:13 -0500387 inode = ext4_iget(parent->i_sb, ea_ino, EXT4_IGET_NORMAL);
Tahsin Erdoganbab79b02017-06-21 21:49:53 -0400388 if (IS_ERR(inode)) {
389 err = PTR_ERR(inode);
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400390 ext4_error(parent->i_sb,
391 "error while reading EA inode %lu err=%d", ea_ino,
392 err);
Tahsin Erdoganbab79b02017-06-21 21:49:53 -0400393 return err;
Andreas Dilgere50e5122017-06-21 21:10:32 -0400394 }
395
Tahsin Erdoganbab79b02017-06-21 21:49:53 -0400396 if (is_bad_inode(inode)) {
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400397 ext4_error(parent->i_sb,
398 "error while reading EA inode %lu is_bad_inode",
399 ea_ino);
Tahsin Erdoganbab79b02017-06-21 21:49:53 -0400400 err = -EIO;
Andreas Dilgere50e5122017-06-21 21:10:32 -0400401 goto error;
402 }
403
Tahsin Erdoganbab79b02017-06-21 21:49:53 -0400404 if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) {
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400405 ext4_error(parent->i_sb,
406 "EA inode %lu does not have EXT4_EA_INODE_FL flag",
407 ea_ino);
Tahsin Erdoganbab79b02017-06-21 21:49:53 -0400408 err = -EINVAL;
Andreas Dilgere50e5122017-06-21 21:10:32 -0400409 goto error;
410 }
411
Tahsin Erdogana6d05672017-08-24 14:25:02 -0400412 ext4_xattr_inode_set_class(inode);
413
414 /*
415 * Check whether this is an old Lustre-style xattr inode. Lustre
416 * implementation does not have hash validation, rather it has a
417 * backpointer from ea_inode to the parent inode.
418 */
419 if (ea_inode_hash != ext4_xattr_inode_get_hash(inode) &&
420 EXT4_XATTR_INODE_GET_PARENT(inode) == parent->i_ino &&
421 inode->i_generation == parent->i_generation) {
422 ext4_set_inode_state(inode, EXT4_STATE_LUSTRE_EA_INODE);
423 ext4_xattr_inode_set_ref(inode, 1);
424 } else {
425 inode_lock(inode);
426 inode->i_flags |= S_NOQUOTA;
427 inode_unlock(inode);
428 }
429
Tahsin Erdoganbab79b02017-06-21 21:49:53 -0400430 *ea_inode = inode;
431 return 0;
Andreas Dilgere50e5122017-06-21 21:10:32 -0400432error:
Tahsin Erdoganbab79b02017-06-21 21:49:53 -0400433 iput(inode);
434 return err;
Andreas Dilgere50e5122017-06-21 21:10:32 -0400435}
436
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400437static int
Tahsin Erdoganb9fc7612017-06-22 11:53:15 -0400438ext4_xattr_inode_verify_hashes(struct inode *ea_inode,
439 struct ext4_xattr_entry *entry, void *buffer,
440 size_t size)
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400441{
442 u32 hash;
443
444 /* Verify stored hash matches calculated hash. */
445 hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size);
446 if (hash != ext4_xattr_inode_get_hash(ea_inode))
447 return -EFSCORRUPTED;
Tahsin Erdoganb9fc7612017-06-22 11:53:15 -0400448
449 if (entry) {
450 __le32 e_hash, tmp_data;
451
452 /* Verify entry hash. */
453 tmp_data = cpu_to_le32(hash);
454 e_hash = ext4_xattr_hash_entry(entry->e_name, entry->e_name_len,
455 &tmp_data, 1);
456 if (e_hash != entry->e_hash)
457 return -EFSCORRUPTED;
458 }
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400459 return 0;
460}
461
Andreas Dilgere50e5122017-06-21 21:10:32 -0400462/*
Tahsin Erdoganb9fc7612017-06-22 11:53:15 -0400463 * Read xattr value from the EA inode.
Andreas Dilgere50e5122017-06-21 21:10:32 -0400464 */
465static int
Tahsin Erdoganb9fc7612017-06-22 11:53:15 -0400466ext4_xattr_inode_get(struct inode *inode, struct ext4_xattr_entry *entry,
467 void *buffer, size_t size)
Andreas Dilgere50e5122017-06-21 21:10:32 -0400468{
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400469 struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode);
Tahsin Erdoganbab79b02017-06-21 21:49:53 -0400470 struct inode *ea_inode;
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400471 int err;
Andreas Dilgere50e5122017-06-21 21:10:32 -0400472
Tahsin Erdoganb9fc7612017-06-22 11:53:15 -0400473 err = ext4_xattr_inode_iget(inode, le32_to_cpu(entry->e_value_inum),
Tahsin Erdogana6d05672017-08-24 14:25:02 -0400474 le32_to_cpu(entry->e_hash), &ea_inode);
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400475 if (err) {
476 ea_inode = NULL;
477 goto out;
478 }
Andreas Dilgere50e5122017-06-21 21:10:32 -0400479
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400480 if (i_size_read(ea_inode) != size) {
481 ext4_warning_inode(ea_inode,
482 "ea_inode file size=%llu entry size=%zu",
483 i_size_read(ea_inode), size);
484 err = -EFSCORRUPTED;
485 goto out;
486 }
487
488 err = ext4_xattr_inode_read(ea_inode, buffer, size);
489 if (err)
490 goto out;
491
Tahsin Erdogana6d05672017-08-24 14:25:02 -0400492 if (!ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) {
493 err = ext4_xattr_inode_verify_hashes(ea_inode, entry, buffer,
494 size);
495 if (err) {
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400496 ext4_warning_inode(ea_inode,
497 "EA inode hash validation failed");
498 goto out;
499 }
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400500
Tahsin Erdogana6d05672017-08-24 14:25:02 -0400501 if (ea_inode_cache)
502 mb_cache_entry_create(ea_inode_cache, GFP_NOFS,
503 ext4_xattr_inode_get_hash(ea_inode),
504 ea_inode->i_ino, true /* reusable */);
505 }
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400506out:
Andreas Dilgere50e5122017-06-21 21:10:32 -0400507 iput(ea_inode);
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400508 return err;
Andreas Dilgere50e5122017-06-21 21:10:32 -0400509}
510
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700511static int
Mingming Cao617ba132006-10-11 01:20:53 -0700512ext4_xattr_block_get(struct inode *inode, int name_index, const char *name,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700513 void *buffer, size_t buffer_size)
514{
515 struct buffer_head *bh = NULL;
Mingming Cao617ba132006-10-11 01:20:53 -0700516 struct ext4_xattr_entry *entry;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700517 size_t size;
Theodore Ts'o9496005d2018-03-30 20:00:56 -0400518 void *end;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700519 int error;
Tahsin Erdogan47387402017-06-22 11:28:55 -0400520 struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700521
522 ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld",
523 name_index, name, buffer, (long)buffer_size);
524
Mingming Cao617ba132006-10-11 01:20:53 -0700525 if (!EXT4_I(inode)->i_file_acl)
Theodore Ts'ofb265c9c2018-11-25 17:20:31 -0500526 return -ENODATA;
Joe Perchesace36ad2012-03-19 23:11:43 -0400527 ea_idebug(inode, "reading block %llu",
528 (unsigned long long)EXT4_I(inode)->i_file_acl);
Theodore Ts'ofb265c9c2018-11-25 17:20:31 -0500529 bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO);
530 if (IS_ERR(bh))
531 return PTR_ERR(bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700532 ea_bdebug(bh, "b_count=%d, refcount=%d",
533 atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount));
Theodore Ts'ode05ca82018-03-30 15:42:25 -0400534 error = ext4_xattr_check_block(inode, bh);
535 if (error)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700536 goto cleanup;
Tahsin Erdogan47387402017-06-22 11:28:55 -0400537 ext4_xattr_block_cache_insert(ea_block_cache, bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700538 entry = BFIRST(bh);
Theodore Ts'o9496005d2018-03-30 20:00:56 -0400539 end = bh->b_data + bh->b_size;
540 error = xattr_find_entry(inode, &entry, end, name_index, name, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700541 if (error)
542 goto cleanup;
543 size = le32_to_cpu(entry->e_value_size);
Theodore Ts'o54dd0e02018-03-30 20:04:11 -0400544 error = -ERANGE;
545 if (unlikely(size > EXT4_XATTR_SIZE_MAX))
546 goto cleanup;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700547 if (buffer) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700548 if (size > buffer_size)
549 goto cleanup;
Andreas Dilgere50e5122017-06-21 21:10:32 -0400550 if (entry->e_value_inum) {
Tahsin Erdoganb9fc7612017-06-22 11:53:15 -0400551 error = ext4_xattr_inode_get(inode, entry, buffer,
552 size);
Andreas Dilgere50e5122017-06-21 21:10:32 -0400553 if (error)
554 goto cleanup;
555 } else {
Theodore Ts'o54dd0e02018-03-30 20:04:11 -0400556 u16 offset = le16_to_cpu(entry->e_value_offs);
557 void *p = bh->b_data + offset;
558
559 if (unlikely(p + size > end))
560 goto cleanup;
561 memcpy(buffer, p, size);
Andreas Dilgere50e5122017-06-21 21:10:32 -0400562 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700563 }
564 error = size;
565
566cleanup:
567 brelse(bh);
568 return error;
569}
570
Tao Ma879b3822012-12-05 10:28:46 -0500571int
Mingming Cao617ba132006-10-11 01:20:53 -0700572ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700573 void *buffer, size_t buffer_size)
574{
Mingming Cao617ba132006-10-11 01:20:53 -0700575 struct ext4_xattr_ibody_header *header;
576 struct ext4_xattr_entry *entry;
577 struct ext4_inode *raw_inode;
578 struct ext4_iloc iloc;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700579 size_t size;
580 void *end;
581 int error;
582
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500583 if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700584 return -ENODATA;
Mingming Cao617ba132006-10-11 01:20:53 -0700585 error = ext4_get_inode_loc(inode, &iloc);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700586 if (error)
587 return error;
Mingming Cao617ba132006-10-11 01:20:53 -0700588 raw_inode = ext4_raw_inode(&iloc);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700589 header = IHDR(inode, raw_inode);
Mingming Cao617ba132006-10-11 01:20:53 -0700590 end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
Theodore Ts'o9e92f482016-03-22 16:13:15 -0400591 error = xattr_check_inode(inode, header, end);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700592 if (error)
593 goto cleanup;
Eric Biggers6ba644b2017-04-30 00:01:02 -0400594 entry = IFIRST(header);
Theodore Ts'o9496005d2018-03-30 20:00:56 -0400595 error = xattr_find_entry(inode, &entry, end, name_index, name, 0);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700596 if (error)
597 goto cleanup;
598 size = le32_to_cpu(entry->e_value_size);
Theodore Ts'o54dd0e02018-03-30 20:04:11 -0400599 error = -ERANGE;
600 if (unlikely(size > EXT4_XATTR_SIZE_MAX))
601 goto cleanup;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700602 if (buffer) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700603 if (size > buffer_size)
604 goto cleanup;
Andreas Dilgere50e5122017-06-21 21:10:32 -0400605 if (entry->e_value_inum) {
Tahsin Erdoganb9fc7612017-06-22 11:53:15 -0400606 error = ext4_xattr_inode_get(inode, entry, buffer,
607 size);
Andreas Dilgere50e5122017-06-21 21:10:32 -0400608 if (error)
609 goto cleanup;
610 } else {
Theodore Ts'o54dd0e02018-03-30 20:04:11 -0400611 u16 offset = le16_to_cpu(entry->e_value_offs);
612 void *p = (void *)IFIRST(header) + offset;
613
614 if (unlikely(p + size > end))
615 goto cleanup;
616 memcpy(buffer, p, size);
Andreas Dilgere50e5122017-06-21 21:10:32 -0400617 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700618 }
619 error = size;
620
621cleanup:
622 brelse(iloc.bh);
623 return error;
624}
625
626/*
Mingming Cao617ba132006-10-11 01:20:53 -0700627 * ext4_xattr_get()
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700628 *
629 * Copy an extended attribute into the buffer
630 * provided, or compute the buffer size required.
631 * Buffer is NULL to compute the size of the buffer required.
632 *
633 * Returns a negative error number on failure, or the number of bytes
634 * used / required on success.
635 */
636int
Mingming Cao617ba132006-10-11 01:20:53 -0700637ext4_xattr_get(struct inode *inode, int name_index, const char *name,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700638 void *buffer, size_t buffer_size)
639{
640 int error;
641
Theodore Ts'o0db1ff22017-02-05 01:28:48 -0500642 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
643 return -EIO;
644
Zhang Zhen230b8c1a2014-05-12 09:57:59 -0400645 if (strlen(name) > 255)
646 return -ERANGE;
647
Mingming Cao617ba132006-10-11 01:20:53 -0700648 down_read(&EXT4_I(inode)->xattr_sem);
649 error = ext4_xattr_ibody_get(inode, name_index, name, buffer,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700650 buffer_size);
651 if (error == -ENODATA)
Mingming Cao617ba132006-10-11 01:20:53 -0700652 error = ext4_xattr_block_get(inode, name_index, name, buffer,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700653 buffer_size);
Mingming Cao617ba132006-10-11 01:20:53 -0700654 up_read(&EXT4_I(inode)->xattr_sem);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700655 return error;
656}
657
658static int
Christoph Hellwig431547b2009-11-13 09:52:56 +0000659ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700660 char *buffer, size_t buffer_size)
661{
662 size_t rest = buffer_size;
663
Mingming Cao617ba132006-10-11 01:20:53 -0700664 for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
Stephen Hemminger11e27522010-05-13 17:53:18 -0700665 const struct xattr_handler *handler =
Mingming Cao617ba132006-10-11 01:20:53 -0700666 ext4_xattr_handler(entry->e_name_index);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700667
Andreas Gruenbacher764a5c62015-12-02 14:44:43 +0100668 if (handler && (!handler->list || handler->list(dentry))) {
669 const char *prefix = handler->prefix ?: handler->name;
670 size_t prefix_len = strlen(prefix);
671 size_t size = prefix_len + entry->e_name_len + 1;
672
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700673 if (buffer) {
674 if (size > rest)
675 return -ERANGE;
Andreas Gruenbacher764a5c62015-12-02 14:44:43 +0100676 memcpy(buffer, prefix, prefix_len);
677 buffer += prefix_len;
678 memcpy(buffer, entry->e_name, entry->e_name_len);
679 buffer += entry->e_name_len;
680 *buffer++ = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700681 }
682 rest -= size;
683 }
684 }
Andreas Gruenbacher764a5c62015-12-02 14:44:43 +0100685 return buffer_size - rest; /* total size */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700686}
687
688static int
Christoph Hellwig431547b2009-11-13 09:52:56 +0000689ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700690{
David Howells2b0143b2015-03-17 22:25:59 +0000691 struct inode *inode = d_inode(dentry);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700692 struct buffer_head *bh = NULL;
693 int error;
694
695 ea_idebug(inode, "buffer=%p, buffer_size=%ld",
696 buffer, (long)buffer_size);
697
Mingming Cao617ba132006-10-11 01:20:53 -0700698 if (!EXT4_I(inode)->i_file_acl)
Theodore Ts'ofb265c9c2018-11-25 17:20:31 -0500699 return 0;
Joe Perchesace36ad2012-03-19 23:11:43 -0400700 ea_idebug(inode, "reading block %llu",
701 (unsigned long long)EXT4_I(inode)->i_file_acl);
Theodore Ts'ofb265c9c2018-11-25 17:20:31 -0500702 bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO);
703 if (IS_ERR(bh))
704 return PTR_ERR(bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700705 ea_bdebug(bh, "b_count=%d, refcount=%d",
706 atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount));
Theodore Ts'ode05ca82018-03-30 15:42:25 -0400707 error = ext4_xattr_check_block(inode, bh);
708 if (error)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700709 goto cleanup;
Tahsin Erdogan47387402017-06-22 11:28:55 -0400710 ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh);
Theodore Ts'ofb265c9c2018-11-25 17:20:31 -0500711 error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer,
712 buffer_size);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700713cleanup:
714 brelse(bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700715 return error;
716}
717
718static int
Christoph Hellwig431547b2009-11-13 09:52:56 +0000719ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700720{
David Howells2b0143b2015-03-17 22:25:59 +0000721 struct inode *inode = d_inode(dentry);
Mingming Cao617ba132006-10-11 01:20:53 -0700722 struct ext4_xattr_ibody_header *header;
723 struct ext4_inode *raw_inode;
724 struct ext4_iloc iloc;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700725 void *end;
726 int error;
727
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500728 if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700729 return 0;
Mingming Cao617ba132006-10-11 01:20:53 -0700730 error = ext4_get_inode_loc(inode, &iloc);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700731 if (error)
732 return error;
Mingming Cao617ba132006-10-11 01:20:53 -0700733 raw_inode = ext4_raw_inode(&iloc);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700734 header = IHDR(inode, raw_inode);
Mingming Cao617ba132006-10-11 01:20:53 -0700735 end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
Theodore Ts'o9e92f482016-03-22 16:13:15 -0400736 error = xattr_check_inode(inode, header, end);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700737 if (error)
738 goto cleanup;
Christoph Hellwig431547b2009-11-13 09:52:56 +0000739 error = ext4_xattr_list_entries(dentry, IFIRST(header),
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700740 buffer, buffer_size);
741
742cleanup:
743 brelse(iloc.bh);
744 return error;
745}
746
747/*
Eric Biggersba7ea1d2017-04-29 23:53:17 -0400748 * Inode operation listxattr()
749 *
750 * d_inode(dentry)->i_rwsem: don't care
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700751 *
752 * Copy a list of attribute names into the buffer
753 * provided, or compute the buffer size required.
754 * Buffer is NULL to compute the size of the buffer required.
755 *
756 * Returns a negative error number on failure, or the number of bytes
757 * used / required on success.
758 */
Eric Biggersba7ea1d2017-04-29 23:53:17 -0400759ssize_t
760ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700761{
Theodore Ts'oeaeef862011-01-10 12:10:07 -0500762 int ret, ret2;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700763
David Howells2b0143b2015-03-17 22:25:59 +0000764 down_read(&EXT4_I(d_inode(dentry))->xattr_sem);
Theodore Ts'oeaeef862011-01-10 12:10:07 -0500765 ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size);
766 if (ret < 0)
767 goto errout;
768 if (buffer) {
769 buffer += ret;
770 buffer_size -= ret;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700771 }
Theodore Ts'oeaeef862011-01-10 12:10:07 -0500772 ret = ext4_xattr_block_list(dentry, buffer, buffer_size);
773 if (ret < 0)
774 goto errout;
775 ret += ret2;
776errout:
David Howells2b0143b2015-03-17 22:25:59 +0000777 up_read(&EXT4_I(d_inode(dentry))->xattr_sem);
Theodore Ts'oeaeef862011-01-10 12:10:07 -0500778 return ret;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700779}
780
781/*
Mingming Cao617ba132006-10-11 01:20:53 -0700782 * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700783 * not set, set it.
784 */
Mingming Cao617ba132006-10-11 01:20:53 -0700785static void ext4_xattr_update_super_block(handle_t *handle,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700786 struct super_block *sb)
787{
Darrick J. Wonge2b911c2015-10-17 16:18:43 -0400788 if (ext4_has_feature_xattr(sb))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700789 return;
790
liang xie5d601252014-05-12 22:06:43 -0400791 BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access");
Mingming Cao617ba132006-10-11 01:20:53 -0700792 if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) {
Darrick J. Wonge2b911c2015-10-17 16:18:43 -0400793 ext4_set_feature_xattr(sb);
Theodore Ts'oa0375152010-06-11 23:14:04 -0400794 ext4_handle_dirty_super(handle, sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700795 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700796}
797
Tahsin Erdogan7a9ca532017-06-22 11:46:48 -0400798int ext4_get_inode_usage(struct inode *inode, qsize_t *usage)
799{
800 struct ext4_iloc iloc = { .bh = NULL };
801 struct buffer_head *bh = NULL;
802 struct ext4_inode *raw_inode;
803 struct ext4_xattr_ibody_header *header;
804 struct ext4_xattr_entry *entry;
805 qsize_t ea_inode_refs = 0;
806 void *end;
807 int ret;
808
809 lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem);
810
811 if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) {
812 ret = ext4_get_inode_loc(inode, &iloc);
813 if (ret)
814 goto out;
815 raw_inode = ext4_raw_inode(&iloc);
816 header = IHDR(inode, raw_inode);
817 end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
818 ret = xattr_check_inode(inode, header, end);
819 if (ret)
820 goto out;
821
822 for (entry = IFIRST(header); !IS_LAST_ENTRY(entry);
823 entry = EXT4_XATTR_NEXT(entry))
824 if (entry->e_value_inum)
825 ea_inode_refs++;
826 }
827
828 if (EXT4_I(inode)->i_file_acl) {
Theodore Ts'ofb265c9c2018-11-25 17:20:31 -0500829 bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO);
830 if (IS_ERR(bh)) {
831 ret = PTR_ERR(bh);
Dan Carpenter7159a982019-02-21 11:17:34 -0500832 bh = NULL;
Tahsin Erdogan7a9ca532017-06-22 11:46:48 -0400833 goto out;
834 }
835
Theodore Ts'ode05ca82018-03-30 15:42:25 -0400836 ret = ext4_xattr_check_block(inode, bh);
837 if (ret)
Tahsin Erdogan7a9ca532017-06-22 11:46:48 -0400838 goto out;
Tahsin Erdogan7a9ca532017-06-22 11:46:48 -0400839
840 for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry);
841 entry = EXT4_XATTR_NEXT(entry))
842 if (entry->e_value_inum)
843 ea_inode_refs++;
844 }
845 *usage = ea_inode_refs + 1;
846 ret = 0;
847out:
848 brelse(iloc.bh);
849 brelse(bh);
850 return ret;
851}
852
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400853static inline size_t round_up_cluster(struct inode *inode, size_t length)
854{
855 struct super_block *sb = inode->i_sb;
856 size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits +
857 inode->i_blkbits);
858 size_t mask = ~(cluster_size - 1);
859
860 return (length + cluster_size - 1) & mask;
861}
862
863static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len)
864{
865 int err;
866
867 err = dquot_alloc_inode(inode);
868 if (err)
869 return err;
870 err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len));
871 if (err)
872 dquot_free_inode(inode);
873 return err;
874}
875
Tahsin Erdogana6d05672017-08-24 14:25:02 -0400876static void ext4_xattr_inode_free_quota(struct inode *parent,
877 struct inode *ea_inode,
878 size_t len)
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400879{
Tahsin Erdogana6d05672017-08-24 14:25:02 -0400880 if (ea_inode &&
881 ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE))
882 return;
883 dquot_free_space_nodirty(parent, round_up_cluster(parent, len));
884 dquot_free_inode(parent);
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400885}
886
Tahsin Erdoganaf652072017-07-06 00:01:59 -0400887int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode,
888 struct buffer_head *block_bh, size_t value_len,
889 bool is_create)
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400890{
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400891 int credits;
892 int blocks;
893
894 /*
895 * 1) Owner inode update
896 * 2) Ref count update on old xattr block
897 * 3) new xattr block
898 * 4) block bitmap update for new xattr block
899 * 5) group descriptor for new xattr block
900 * 6) block bitmap update for old xattr block
901 * 7) group descriptor for old block
902 *
903 * 6 & 7 can happen if we have two racing threads T_a and T_b
904 * which are each trying to set an xattr on inodes I_a and I_b
905 * which were both initially sharing an xattr block.
906 */
907 credits = 7;
908
909 /* Quota updates. */
910 credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb);
911
912 /*
913 * In case of inline data, we may push out the data to a block,
914 * so we need to reserve credits for this eventuality
915 */
Tahsin Erdoganaf652072017-07-06 00:01:59 -0400916 if (inode && ext4_has_inline_data(inode))
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400917 credits += ext4_writepage_trans_blocks(inode) + 1;
918
919 /* We are done if ea_inode feature is not enabled. */
920 if (!ext4_has_feature_ea_inode(sb))
921 return credits;
922
923 /* New ea_inode, inode map, block bitmap, group descriptor. */
924 credits += 4;
925
926 /* Data blocks. */
927 blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
928
929 /* Indirection block or one level of extent tree. */
930 blocks += 1;
931
932 /* Block bitmap and group descriptor updates for each block. */
933 credits += blocks * 2;
934
935 /* Blocks themselves. */
936 credits += blocks;
937
Tahsin Erdoganaf652072017-07-06 00:01:59 -0400938 if (!is_create) {
939 /* Dereference ea_inode holding old xattr value.
940 * Old ea_inode, inode map, block bitmap, group descriptor.
941 */
942 credits += 4;
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400943
Tahsin Erdoganaf652072017-07-06 00:01:59 -0400944 /* Data blocks for old ea_inode. */
945 blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits;
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400946
Tahsin Erdoganaf652072017-07-06 00:01:59 -0400947 /* Indirection block or one level of extent tree for old
948 * ea_inode.
949 */
950 blocks += 1;
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400951
Tahsin Erdoganaf652072017-07-06 00:01:59 -0400952 /* Block bitmap and group descriptor updates for each block. */
953 credits += blocks * 2;
954 }
Tahsin Erdogandec214d2017-06-22 11:44:55 -0400955
956 /* We may need to clone the existing xattr block in which case we need
957 * to increment ref counts for existing ea_inodes referenced by it.
958 */
959 if (block_bh) {
960 struct ext4_xattr_entry *entry = BFIRST(block_bh);
961
962 for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry))
963 if (entry->e_value_inum)
964 /* Ref count update on ea_inode. */
965 credits += 1;
966 }
967 return credits;
968}
969
Tahsin Erdogan30a7eb92017-06-22 11:42:09 -0400970static int ext4_xattr_ensure_credits(handle_t *handle, struct inode *inode,
971 int credits, struct buffer_head *bh,
972 bool dirty, bool block_csum)
973{
974 int error;
975
976 if (!ext4_handle_valid(handle))
977 return 0;
978
979 if (handle->h_buffer_credits >= credits)
980 return 0;
981
982 error = ext4_journal_extend(handle, credits - handle->h_buffer_credits);
983 if (!error)
984 return 0;
985 if (error < 0) {
986 ext4_warning(inode->i_sb, "Extend journal (error %d)", error);
987 return error;
988 }
989
990 if (bh && dirty) {
991 if (block_csum)
992 ext4_xattr_block_csum_set(inode, bh);
993 error = ext4_handle_dirty_metadata(handle, NULL, bh);
994 if (error) {
995 ext4_warning(inode->i_sb, "Handle metadata (error %d)",
996 error);
997 return error;
998 }
999 }
1000
1001 error = ext4_journal_restart(handle, credits);
1002 if (error) {
1003 ext4_warning(inode->i_sb, "Restart journal (error %d)", error);
1004 return error;
1005 }
1006
1007 if (bh) {
1008 error = ext4_journal_get_write_access(handle, bh);
1009 if (error) {
1010 ext4_warning(inode->i_sb,
1011 "Get write access failed (error %d)",
1012 error);
1013 return error;
1014 }
1015 }
1016 return 0;
1017}
1018
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001019static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode,
1020 int ref_change)
1021{
1022 struct mb_cache *ea_inode_cache = EA_INODE_CACHE(ea_inode);
1023 struct ext4_iloc iloc;
1024 s64 ref_count;
1025 u32 hash;
1026 int ret;
1027
1028 inode_lock(ea_inode);
1029
1030 ret = ext4_reserve_inode_write(handle, ea_inode, &iloc);
Vasily Averin1bfc2042018-11-06 17:45:02 -05001031 if (ret)
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001032 goto out;
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001033
1034 ref_count = ext4_xattr_inode_get_ref(ea_inode);
1035 ref_count += ref_change;
1036 ext4_xattr_inode_set_ref(ea_inode, ref_count);
1037
1038 if (ref_change > 0) {
1039 WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld",
1040 ea_inode->i_ino, ref_count);
1041
1042 if (ref_count == 1) {
1043 WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u",
1044 ea_inode->i_ino, ea_inode->i_nlink);
1045
1046 set_nlink(ea_inode, 1);
1047 ext4_orphan_del(handle, ea_inode);
1048
Tahsin Erdogancdb7ee42017-06-22 11:55:14 -04001049 if (ea_inode_cache) {
1050 hash = ext4_xattr_inode_get_hash(ea_inode);
1051 mb_cache_entry_create(ea_inode_cache,
1052 GFP_NOFS, hash,
1053 ea_inode->i_ino,
1054 true /* reusable */);
1055 }
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001056 }
1057 } else {
1058 WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld",
1059 ea_inode->i_ino, ref_count);
1060
1061 if (ref_count == 0) {
1062 WARN_ONCE(ea_inode->i_nlink != 1,
1063 "EA inode %lu i_nlink=%u",
1064 ea_inode->i_ino, ea_inode->i_nlink);
1065
1066 clear_nlink(ea_inode);
1067 ext4_orphan_add(handle, ea_inode);
1068
Tahsin Erdogancdb7ee42017-06-22 11:55:14 -04001069 if (ea_inode_cache) {
1070 hash = ext4_xattr_inode_get_hash(ea_inode);
1071 mb_cache_entry_delete(ea_inode_cache, hash,
1072 ea_inode->i_ino);
1073 }
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001074 }
1075 }
1076
1077 ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc);
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001078 if (ret)
1079 ext4_warning_inode(ea_inode,
1080 "ext4_mark_iloc_dirty() failed ret=%d", ret);
1081out:
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001082 inode_unlock(ea_inode);
1083 return ret;
1084}
1085
1086static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode)
1087{
1088 return ext4_xattr_inode_update_ref(handle, ea_inode, 1);
1089}
1090
1091static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode)
1092{
1093 return ext4_xattr_inode_update_ref(handle, ea_inode, -1);
1094}
1095
1096static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent,
1097 struct ext4_xattr_entry *first)
1098{
1099 struct inode *ea_inode;
1100 struct ext4_xattr_entry *entry;
1101 struct ext4_xattr_entry *failed_entry;
1102 unsigned int ea_ino;
1103 int err, saved_err;
1104
1105 for (entry = first; !IS_LAST_ENTRY(entry);
1106 entry = EXT4_XATTR_NEXT(entry)) {
1107 if (!entry->e_value_inum)
1108 continue;
1109 ea_ino = le32_to_cpu(entry->e_value_inum);
Tahsin Erdogana6d05672017-08-24 14:25:02 -04001110 err = ext4_xattr_inode_iget(parent, ea_ino,
1111 le32_to_cpu(entry->e_hash),
1112 &ea_inode);
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001113 if (err)
1114 goto cleanup;
1115 err = ext4_xattr_inode_inc_ref(handle, ea_inode);
1116 if (err) {
1117 ext4_warning_inode(ea_inode, "inc ref error %d", err);
1118 iput(ea_inode);
1119 goto cleanup;
1120 }
1121 iput(ea_inode);
1122 }
1123 return 0;
1124
1125cleanup:
1126 saved_err = err;
1127 failed_entry = entry;
1128
1129 for (entry = first; entry != failed_entry;
1130 entry = EXT4_XATTR_NEXT(entry)) {
1131 if (!entry->e_value_inum)
1132 continue;
1133 ea_ino = le32_to_cpu(entry->e_value_inum);
Tahsin Erdogana6d05672017-08-24 14:25:02 -04001134 err = ext4_xattr_inode_iget(parent, ea_ino,
1135 le32_to_cpu(entry->e_hash),
1136 &ea_inode);
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001137 if (err) {
1138 ext4_warning(parent->i_sb,
1139 "cleanup ea_ino %u iget error %d", ea_ino,
1140 err);
1141 continue;
1142 }
1143 err = ext4_xattr_inode_dec_ref(handle, ea_inode);
1144 if (err)
1145 ext4_warning_inode(ea_inode, "cleanup dec ref error %d",
1146 err);
1147 iput(ea_inode);
1148 }
1149 return saved_err;
1150}
1151
Tahsin Erdogan30a7eb92017-06-22 11:42:09 -04001152static void
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001153ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent,
1154 struct buffer_head *bh,
1155 struct ext4_xattr_entry *first, bool block_csum,
1156 struct ext4_xattr_inode_array **ea_inode_array,
1157 int extra_credits, bool skip_quota)
Tahsin Erdogan30a7eb92017-06-22 11:42:09 -04001158{
1159 struct inode *ea_inode;
1160 struct ext4_xattr_entry *entry;
1161 bool dirty = false;
1162 unsigned int ea_ino;
1163 int err;
1164 int credits;
1165
1166 /* One credit for dec ref on ea_inode, one for orphan list addition, */
1167 credits = 2 + extra_credits;
1168
1169 for (entry = first; !IS_LAST_ENTRY(entry);
1170 entry = EXT4_XATTR_NEXT(entry)) {
1171 if (!entry->e_value_inum)
1172 continue;
1173 ea_ino = le32_to_cpu(entry->e_value_inum);
Tahsin Erdogana6d05672017-08-24 14:25:02 -04001174 err = ext4_xattr_inode_iget(parent, ea_ino,
1175 le32_to_cpu(entry->e_hash),
1176 &ea_inode);
Tahsin Erdogan30a7eb92017-06-22 11:42:09 -04001177 if (err)
1178 continue;
1179
1180 err = ext4_expand_inode_array(ea_inode_array, ea_inode);
1181 if (err) {
1182 ext4_warning_inode(ea_inode,
1183 "Expand inode array err=%d", err);
1184 iput(ea_inode);
1185 continue;
1186 }
1187
1188 err = ext4_xattr_ensure_credits(handle, parent, credits, bh,
1189 dirty, block_csum);
1190 if (err) {
1191 ext4_warning_inode(ea_inode, "Ensure credits err=%d",
1192 err);
1193 continue;
1194 }
1195
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001196 err = ext4_xattr_inode_dec_ref(handle, ea_inode);
1197 if (err) {
1198 ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d",
1199 err);
1200 continue;
1201 }
1202
1203 if (!skip_quota)
Tahsin Erdogana6d05672017-08-24 14:25:02 -04001204 ext4_xattr_inode_free_quota(parent, ea_inode,
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001205 le32_to_cpu(entry->e_value_size));
Tahsin Erdogan30a7eb92017-06-22 11:42:09 -04001206
1207 /*
1208 * Forget about ea_inode within the same transaction that
1209 * decrements the ref count. This avoids duplicate decrements in
1210 * case the rest of the work spills over to subsequent
1211 * transactions.
1212 */
1213 entry->e_value_inum = 0;
1214 entry->e_value_size = 0;
1215
1216 dirty = true;
1217 }
1218
1219 if (dirty) {
1220 /*
1221 * Note that we are deliberately skipping csum calculation for
1222 * the final update because we do not expect any journal
1223 * restarts until xattr block is freed.
1224 */
1225
1226 err = ext4_handle_dirty_metadata(handle, NULL, bh);
1227 if (err)
1228 ext4_warning_inode(parent,
1229 "handle dirty metadata err=%d", err);
1230 }
1231}
1232
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001233/*
Jan Karaec4cb1a2014-04-07 10:54:21 -04001234 * Release the xattr block BH: If the reference count is > 1, decrement it;
1235 * otherwise free the block.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001236 */
1237static void
Mingming Cao617ba132006-10-11 01:20:53 -07001238ext4_xattr_release_block(handle_t *handle, struct inode *inode,
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001239 struct buffer_head *bh,
1240 struct ext4_xattr_inode_array **ea_inode_array,
1241 int extra_credits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001242{
Tahsin Erdogan47387402017-06-22 11:28:55 -04001243 struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode);
Andreas Gruenbacher6048c642016-02-22 22:44:04 -05001244 u32 hash, ref;
Mingming Cao8a2bfdc2007-02-28 20:13:35 -08001245 int error = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001246
liang xie5d601252014-05-12 22:06:43 -04001247 BUFFER_TRACE(bh, "get_write_access");
Mingming Cao8a2bfdc2007-02-28 20:13:35 -08001248 error = ext4_journal_get_write_access(handle, bh);
1249 if (error)
1250 goto out;
1251
1252 lock_buffer(bh);
Andreas Gruenbacher6048c642016-02-22 22:44:04 -05001253 hash = le32_to_cpu(BHDR(bh)->h_hash);
1254 ref = le32_to_cpu(BHDR(bh)->h_refcount);
1255 if (ref == 1) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001256 ea_bdebug(bh, "refcount now=0; freeing");
Jan Kara82939d72016-02-22 11:50:13 -05001257 /*
1258 * This must happen under buffer lock for
1259 * ext4_xattr_block_set() to reliably detect freed block
1260 */
Tahsin Erdogancdb7ee42017-06-22 11:55:14 -04001261 if (ea_block_cache)
1262 mb_cache_entry_delete(ea_block_cache, hash,
1263 bh->b_blocknr);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001264 get_bh(bh);
Jan Karaec4cb1a2014-04-07 10:54:21 -04001265 unlock_buffer(bh);
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001266
1267 if (ext4_has_feature_ea_inode(inode->i_sb))
1268 ext4_xattr_inode_dec_ref_all(handle, inode, bh,
1269 BFIRST(bh),
1270 true /* block_csum */,
1271 ea_inode_array,
1272 extra_credits,
1273 true /* skip_quota */);
Theodore Ts'oe6362602009-11-23 07:17:05 -05001274 ext4_free_blocks(handle, inode, bh, 0, 1,
1275 EXT4_FREE_BLOCKS_METADATA |
1276 EXT4_FREE_BLOCKS_FORGET);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001277 } else {
Andreas Gruenbacher6048c642016-02-22 22:44:04 -05001278 ref--;
1279 BHDR(bh)->h_refcount = cpu_to_le32(ref);
1280 if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) {
1281 struct mb_cache_entry *ce;
1282
Tahsin Erdogancdb7ee42017-06-22 11:55:14 -04001283 if (ea_block_cache) {
1284 ce = mb_cache_entry_get(ea_block_cache, hash,
1285 bh->b_blocknr);
1286 if (ce) {
1287 ce->e_reusable = 1;
1288 mb_cache_entry_put(ea_block_cache, ce);
1289 }
Andreas Gruenbacher6048c642016-02-22 22:44:04 -05001290 }
1291 }
1292
Theodore Ts'odac7a4b2017-03-25 17:22:47 -04001293 ext4_xattr_block_csum_set(inode, bh);
Jan Karaec4cb1a2014-04-07 10:54:21 -04001294 /*
1295 * Beware of this ugliness: Releasing of xattr block references
1296 * from different inodes can race and so we have to protect
1297 * from a race where someone else frees the block (and releases
1298 * its journal_head) before we are done dirtying the buffer. In
1299 * nojournal mode this race is harmless and we actually cannot
Theodore Ts'odac7a4b2017-03-25 17:22:47 -04001300 * call ext4_handle_dirty_metadata() with locked buffer as
Jan Karaec4cb1a2014-04-07 10:54:21 -04001301 * that function can call sync_dirty_buffer() so for that case
1302 * we handle the dirtying after unlocking the buffer.
1303 */
1304 if (ext4_handle_valid(handle))
Theodore Ts'odac7a4b2017-03-25 17:22:47 -04001305 error = ext4_handle_dirty_metadata(handle, inode, bh);
Eric Sandeenc1bb05a2012-02-20 23:06:18 -05001306 unlock_buffer(bh);
Jan Karaec4cb1a2014-04-07 10:54:21 -04001307 if (!ext4_handle_valid(handle))
Theodore Ts'odac7a4b2017-03-25 17:22:47 -04001308 error = ext4_handle_dirty_metadata(handle, inode, bh);
Mingming Cao8a2bfdc2007-02-28 20:13:35 -08001309 if (IS_SYNC(inode))
Frank Mayhar03901312009-01-07 00:06:22 -05001310 ext4_handle_sync(handle);
Lukas Czerner1231b3a2013-02-18 12:12:07 -05001311 dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1));
Mingming Cao8a2bfdc2007-02-28 20:13:35 -08001312 ea_bdebug(bh, "refcount now=%d; releasing",
1313 le32_to_cpu(BHDR(bh)->h_refcount));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001314 }
Mingming Cao8a2bfdc2007-02-28 20:13:35 -08001315out:
1316 ext4_std_error(inode->i_sb, error);
1317 return;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001318}
1319
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04001320/*
1321 * Find the available free space for EAs. This also returns the total number of
1322 * bytes used by EA entries.
1323 */
1324static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last,
1325 size_t *min_offs, void *base, int *total)
1326{
1327 for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) {
Andreas Dilgere50e5122017-06-21 21:10:32 -04001328 if (!last->e_value_inum && last->e_value_size) {
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04001329 size_t offs = le16_to_cpu(last->e_value_offs);
1330 if (offs < *min_offs)
1331 *min_offs = offs;
1332 }
Theodore Ts'o7b1b2c12014-02-19 20:15:21 -05001333 if (total)
1334 *total += EXT4_XATTR_LEN(last->e_name_len);
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04001335 }
1336 return (*min_offs - ((void *)last - base) - sizeof(__u32));
1337}
1338
Andreas Dilgere50e5122017-06-21 21:10:32 -04001339/*
1340 * Write the value of the EA in an inode.
1341 */
1342static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode,
1343 const void *buf, int bufsize)
1344{
1345 struct buffer_head *bh = NULL;
1346 unsigned long block = 0;
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001347 int blocksize = ea_inode->i_sb->s_blocksize;
1348 int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits;
Andreas Dilgere50e5122017-06-21 21:10:32 -04001349 int csize, wsize = 0;
1350 int ret = 0;
1351 int retries = 0;
1352
1353retry:
1354 while (ret >= 0 && ret < max_blocks) {
1355 struct ext4_map_blocks map;
1356 map.m_lblk = block += ret;
1357 map.m_len = max_blocks -= ret;
1358
1359 ret = ext4_map_blocks(handle, ea_inode, &map,
1360 EXT4_GET_BLOCKS_CREATE);
1361 if (ret <= 0) {
1362 ext4_mark_inode_dirty(handle, ea_inode);
1363 if (ret == -ENOSPC &&
1364 ext4_should_retry_alloc(ea_inode->i_sb, &retries)) {
1365 ret = 0;
1366 goto retry;
1367 }
1368 break;
1369 }
1370 }
1371
1372 if (ret < 0)
1373 return ret;
1374
1375 block = 0;
1376 while (wsize < bufsize) {
1377 if (bh != NULL)
1378 brelse(bh);
1379 csize = (bufsize - wsize) > blocksize ? blocksize :
1380 bufsize - wsize;
1381 bh = ext4_getblk(handle, ea_inode, block, 0);
1382 if (IS_ERR(bh))
1383 return PTR_ERR(bh);
Vasily Averineb6984f2018-11-09 11:34:40 -05001384 if (!bh) {
1385 WARN_ON_ONCE(1);
1386 EXT4_ERROR_INODE(ea_inode,
1387 "ext4_getblk() return bh = NULL");
1388 return -EFSCORRUPTED;
1389 }
Andreas Dilgere50e5122017-06-21 21:10:32 -04001390 ret = ext4_journal_get_write_access(handle, bh);
1391 if (ret)
1392 goto out;
1393
1394 memcpy(bh->b_data, buf, csize);
1395 set_buffer_uptodate(bh);
1396 ext4_handle_dirty_metadata(handle, ea_inode, bh);
1397
1398 buf += csize;
1399 wsize += csize;
1400 block += 1;
1401 }
1402
1403 inode_lock(ea_inode);
1404 i_size_write(ea_inode, wsize);
1405 ext4_update_i_disksize(ea_inode, wsize);
1406 inode_unlock(ea_inode);
1407
1408 ext4_mark_inode_dirty(handle, ea_inode);
1409
1410out:
1411 brelse(bh);
1412
1413 return ret;
1414}
1415
1416/*
1417 * Create an inode to store the value of a large EA.
1418 */
1419static struct inode *ext4_xattr_inode_create(handle_t *handle,
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001420 struct inode *inode, u32 hash)
Andreas Dilgere50e5122017-06-21 21:10:32 -04001421{
1422 struct inode *ea_inode = NULL;
Tahsin Erdogan9e1ba002017-06-21 21:27:00 -04001423 uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) };
Tahsin Erdoganbd3b9632017-06-21 21:24:31 -04001424 int err;
Andreas Dilgere50e5122017-06-21 21:10:32 -04001425
1426 /*
1427 * Let the next inode be the goal, so we try and allocate the EA inode
1428 * in the same group, or nearby one.
1429 */
1430 ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode,
Tahsin Erdogan9e1ba002017-06-21 21:27:00 -04001431 S_IFREG | 0600, NULL, inode->i_ino + 1, owner,
Tahsin Erdogan1b917ed2017-06-21 21:21:39 -04001432 EXT4_EA_INODE_FL);
Andreas Dilgere50e5122017-06-21 21:10:32 -04001433 if (!IS_ERR(ea_inode)) {
1434 ea_inode->i_op = &ext4_file_inode_operations;
1435 ea_inode->i_fop = &ext4_file_operations;
1436 ext4_set_aops(ea_inode);
Tahsin Erdogan33d201e2017-06-21 21:17:10 -04001437 ext4_xattr_inode_set_class(ea_inode);
Andreas Dilgere50e5122017-06-21 21:10:32 -04001438 unlock_new_inode(ea_inode);
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001439 ext4_xattr_inode_set_ref(ea_inode, 1);
1440 ext4_xattr_inode_set_hash(ea_inode, hash);
1441 err = ext4_mark_inode_dirty(handle, ea_inode);
1442 if (!err)
1443 err = ext4_inode_attach_jinode(ea_inode);
Tahsin Erdoganbd3b9632017-06-21 21:24:31 -04001444 if (err) {
1445 iput(ea_inode);
1446 return ERR_PTR(err);
1447 }
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001448
1449 /*
1450 * Xattr inodes are shared therefore quota charging is performed
1451 * at a higher level.
1452 */
1453 dquot_free_inode(ea_inode);
1454 dquot_drop(ea_inode);
1455 inode_lock(ea_inode);
1456 ea_inode->i_flags |= S_NOQUOTA;
1457 inode_unlock(ea_inode);
Andreas Dilgere50e5122017-06-21 21:10:32 -04001458 }
1459
1460 return ea_inode;
1461}
1462
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001463static struct inode *
1464ext4_xattr_inode_cache_find(struct inode *inode, const void *value,
1465 size_t value_len, u32 hash)
Andreas Dilgere50e5122017-06-21 21:10:32 -04001466{
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001467 struct inode *ea_inode;
1468 struct mb_cache_entry *ce;
1469 struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode);
1470 void *ea_data;
Andreas Dilgere50e5122017-06-21 21:10:32 -04001471
Tahsin Erdogancdb7ee42017-06-22 11:55:14 -04001472 if (!ea_inode_cache)
1473 return NULL;
1474
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001475 ce = mb_cache_entry_find_first(ea_inode_cache, hash);
1476 if (!ce)
1477 return NULL;
Andreas Dilgere50e5122017-06-21 21:10:32 -04001478
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001479 ea_data = ext4_kvmalloc(value_len, GFP_NOFS);
1480 if (!ea_data) {
1481 mb_cache_entry_put(ea_inode_cache, ce);
1482 return NULL;
1483 }
Andreas Dilgere50e5122017-06-21 21:10:32 -04001484
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001485 while (ce) {
Theodore Ts'o8a363972018-12-19 12:29:13 -05001486 ea_inode = ext4_iget(inode->i_sb, ce->e_value,
1487 EXT4_IGET_NORMAL);
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001488 if (!IS_ERR(ea_inode) &&
1489 !is_bad_inode(ea_inode) &&
1490 (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) &&
1491 i_size_read(ea_inode) == value_len &&
1492 !ext4_xattr_inode_read(ea_inode, ea_data, value_len) &&
Tahsin Erdoganb9fc7612017-06-22 11:53:15 -04001493 !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data,
1494 value_len) &&
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001495 !memcmp(value, ea_data, value_len)) {
1496 mb_cache_entry_touch(ea_inode_cache, ce);
1497 mb_cache_entry_put(ea_inode_cache, ce);
1498 kvfree(ea_data);
1499 return ea_inode;
1500 }
1501
1502 if (!IS_ERR(ea_inode))
1503 iput(ea_inode);
1504 ce = mb_cache_entry_find_next(ea_inode_cache, ce);
1505 }
1506 kvfree(ea_data);
1507 return NULL;
Andreas Dilgere50e5122017-06-21 21:10:32 -04001508}
1509
1510/*
1511 * Add value of the EA in an inode.
1512 */
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001513static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode,
1514 const void *value, size_t value_len,
1515 struct inode **ret_inode)
Andreas Dilgere50e5122017-06-21 21:10:32 -04001516{
1517 struct inode *ea_inode;
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001518 u32 hash;
Andreas Dilgere50e5122017-06-21 21:10:32 -04001519 int err;
1520
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001521 hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len);
1522 ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash);
1523 if (ea_inode) {
1524 err = ext4_xattr_inode_inc_ref(handle, ea_inode);
1525 if (err) {
1526 iput(ea_inode);
1527 return err;
1528 }
1529
1530 *ret_inode = ea_inode;
1531 return 0;
1532 }
1533
Andreas Dilgere50e5122017-06-21 21:10:32 -04001534 /* Create an inode for the EA value */
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001535 ea_inode = ext4_xattr_inode_create(handle, inode, hash);
Andreas Dilgere50e5122017-06-21 21:10:32 -04001536 if (IS_ERR(ea_inode))
1537 return PTR_ERR(ea_inode);
1538
1539 err = ext4_xattr_inode_write(handle, ea_inode, value, value_len);
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001540 if (err) {
1541 ext4_xattr_inode_dec_ref(handle, ea_inode);
1542 iput(ea_inode);
1543 return err;
1544 }
Andreas Dilgere50e5122017-06-21 21:10:32 -04001545
Tahsin Erdogancdb7ee42017-06-22 11:55:14 -04001546 if (EA_INODE_CACHE(inode))
1547 mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash,
1548 ea_inode->i_ino, true /* reusable */);
Andreas Dilgere50e5122017-06-21 21:10:32 -04001549
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001550 *ret_inode = ea_inode;
1551 return 0;
Andreas Dilgere50e5122017-06-21 21:10:32 -04001552}
1553
Tahsin Erdogan9c6e7852017-06-22 11:48:53 -04001554/*
1555 * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode
1556 * feature is enabled.
1557 */
1558#define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U)
1559
Andreas Dilgere50e5122017-06-21 21:10:32 -04001560static int ext4_xattr_set_entry(struct ext4_xattr_info *i,
1561 struct ext4_xattr_search *s,
Tahsin Erdogandaf83282017-06-22 11:52:03 -04001562 handle_t *handle, struct inode *inode,
1563 bool is_block)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001564{
Theodore Ts'o5369a762018-06-13 00:23:11 -04001565 struct ext4_xattr_entry *last, *next;
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001566 struct ext4_xattr_entry *here = s->here;
1567 size_t min_offs = s->end - s->base, name_len = strlen(i->name);
Andreas Dilgere50e5122017-06-21 21:10:32 -04001568 int in_inode = i->in_inode;
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001569 struct inode *old_ea_inode = NULL;
1570 struct inode *new_ea_inode = NULL;
1571 size_t old_size, new_size;
1572 int ret;
1573
1574 /* Space used by old and new values. */
1575 old_size = (!s->not_found && !here->e_value_inum) ?
1576 EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0;
1577 new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0;
1578
1579 /*
1580 * Optimization for the simple case when old and new values have the
1581 * same padded sizes. Not applicable if external inodes are involved.
1582 */
1583 if (new_size && new_size == old_size) {
1584 size_t offs = le16_to_cpu(here->e_value_offs);
1585 void *val = s->base + offs;
1586
1587 here->e_value_size = cpu_to_le32(i->value_len);
1588 if (i->value == EXT4_ZERO_XATTR_VALUE) {
1589 memset(val, 0, new_size);
1590 } else {
1591 memcpy(val, i->value, i->value_len);
1592 /* Clear padding bytes. */
1593 memset(val + i->value_len, 0, new_size - i->value_len);
1594 }
Tahsin Erdogan32aaf192017-08-14 08:30:06 -04001595 goto update_hash;
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001596 }
Andreas Dilgere50e5122017-06-21 21:10:32 -04001597
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001598 /* Compute min_offs and last. */
1599 last = s->first;
Theodore Ts'o5369a762018-06-13 00:23:11 -04001600 for (; !IS_LAST_ENTRY(last); last = next) {
1601 next = EXT4_XATTR_NEXT(last);
1602 if ((void *)next >= s->end) {
1603 EXT4_ERROR_INODE(inode, "corrupted xattr entries");
1604 ret = -EFSCORRUPTED;
1605 goto out;
1606 }
Andreas Dilgere50e5122017-06-21 21:10:32 -04001607 if (!last->e_value_inum && last->e_value_size) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001608 size_t offs = le16_to_cpu(last->e_value_offs);
1609 if (offs < min_offs)
1610 min_offs = offs;
1611 }
1612 }
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001613
1614 /* Check whether we have enough space. */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001615 if (i->value) {
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001616 size_t free;
Andreas Dilgere50e5122017-06-21 21:10:32 -04001617
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001618 free = min_offs - ((void *)last - s->base) - sizeof(__u32);
1619 if (!s->not_found)
1620 free += EXT4_XATTR_LEN(name_len) + old_size;
Andreas Dilgere50e5122017-06-21 21:10:32 -04001621
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001622 if (free < EXT4_XATTR_LEN(name_len) + new_size) {
1623 ret = -ENOSPC;
1624 goto out;
1625 }
Tahsin Erdogan9c6e7852017-06-22 11:48:53 -04001626
1627 /*
1628 * If storing the value in an external inode is an option,
1629 * reserve space for xattr entries/names in the external
1630 * attribute block so that a long value does not occupy the
1631 * whole space and prevent futher entries being added.
1632 */
Tahsin Erdogandaf83282017-06-22 11:52:03 -04001633 if (ext4_has_feature_ea_inode(inode->i_sb) &&
1634 new_size && is_block &&
Tahsin Erdogan9c6e7852017-06-22 11:48:53 -04001635 (min_offs + old_size - new_size) <
1636 EXT4_XATTR_BLOCK_RESERVE(inode)) {
1637 ret = -ENOSPC;
1638 goto out;
1639 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001640 }
1641
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001642 /*
1643 * Getting access to old and new ea inodes is subject to failures.
1644 * Finish that work before doing any modifications to the xattr data.
1645 */
1646 if (!s->not_found && here->e_value_inum) {
1647 ret = ext4_xattr_inode_iget(inode,
1648 le32_to_cpu(here->e_value_inum),
Tahsin Erdogana6d05672017-08-24 14:25:02 -04001649 le32_to_cpu(here->e_hash),
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001650 &old_ea_inode);
1651 if (ret) {
1652 old_ea_inode = NULL;
1653 goto out;
1654 }
1655 }
1656 if (i->value && in_inode) {
1657 WARN_ON_ONCE(!i->value_len);
1658
1659 ret = ext4_xattr_inode_alloc_quota(inode, i->value_len);
1660 if (ret)
1661 goto out;
1662
1663 ret = ext4_xattr_inode_lookup_create(handle, inode, i->value,
1664 i->value_len,
1665 &new_ea_inode);
1666 if (ret) {
1667 new_ea_inode = NULL;
Tahsin Erdogana6d05672017-08-24 14:25:02 -04001668 ext4_xattr_inode_free_quota(inode, NULL, i->value_len);
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001669 goto out;
1670 }
1671 }
1672
1673 if (old_ea_inode) {
1674 /* We are ready to release ref count on the old_ea_inode. */
1675 ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode);
1676 if (ret) {
1677 /* Release newly required ref count on new_ea_inode. */
1678 if (new_ea_inode) {
1679 int err;
1680
1681 err = ext4_xattr_inode_dec_ref(handle,
1682 new_ea_inode);
1683 if (err)
1684 ext4_warning_inode(new_ea_inode,
1685 "dec ref new_ea_inode err=%d",
1686 err);
Tahsin Erdogana6d05672017-08-24 14:25:02 -04001687 ext4_xattr_inode_free_quota(inode, new_ea_inode,
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001688 i->value_len);
1689 }
1690 goto out;
1691 }
1692
Tahsin Erdogana6d05672017-08-24 14:25:02 -04001693 ext4_xattr_inode_free_quota(inode, old_ea_inode,
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001694 le32_to_cpu(here->e_value_size));
1695 }
1696
1697 /* No failures allowed past this point. */
1698
Theodore Ts'oe5d01192019-04-10 00:37:36 -04001699 if (!s->not_found && here->e_value_size && !here->e_value_inum) {
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001700 /* Remove the old value. */
1701 void *first_val = s->base + min_offs;
1702 size_t offs = le16_to_cpu(here->e_value_offs);
1703 void *val = s->base + offs;
1704
1705 memmove(first_val + old_size, first_val, val - first_val);
1706 memset(first_val, 0, old_size);
1707 min_offs += old_size;
1708
1709 /* Adjust all value offsets. */
1710 last = s->first;
1711 while (!IS_LAST_ENTRY(last)) {
1712 size_t o = le16_to_cpu(last->e_value_offs);
1713
1714 if (!last->e_value_inum &&
1715 last->e_value_size && o < offs)
1716 last->e_value_offs = cpu_to_le16(o + old_size);
1717 last = EXT4_XATTR_NEXT(last);
1718 }
1719 }
1720
1721 if (!i->value) {
1722 /* Remove old name. */
Mingming Cao617ba132006-10-11 01:20:53 -07001723 size_t size = EXT4_XATTR_LEN(name_len);
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001724
1725 last = ENTRY((void *)last - size);
1726 memmove(here, (void *)here + size,
1727 (void *)last - (void *)here + sizeof(__u32));
1728 memset(last, 0, size);
1729 } else if (s->not_found) {
1730 /* Insert new name. */
1731 size_t size = EXT4_XATTR_LEN(name_len);
1732 size_t rest = (void *)last - (void *)here + sizeof(__u32);
1733
1734 memmove((void *)here + size, here, rest);
1735 memset(here, 0, size);
1736 here->e_name_index = i->name_index;
1737 here->e_name_len = name_len;
1738 memcpy(here->e_name, i->name, name_len);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001739 } else {
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001740 /* This is an update, reset value info. */
1741 here->e_value_inum = 0;
1742 here->e_value_offs = 0;
1743 here->e_value_size = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001744 }
1745
1746 if (i->value) {
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001747 /* Insert new value. */
Andreas Dilgere50e5122017-06-21 21:10:32 -04001748 if (in_inode) {
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001749 here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino);
Andreas Dilgere50e5122017-06-21 21:10:32 -04001750 } else if (i->value_len) {
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001751 void *val = s->base + min_offs - new_size;
1752
1753 here->e_value_offs = cpu_to_le16(min_offs - new_size);
Theodore Ts'obd9926e2012-12-11 03:31:49 -05001754 if (i->value == EXT4_ZERO_XATTR_VALUE) {
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001755 memset(val, 0, new_size);
Theodore Ts'obd9926e2012-12-11 03:31:49 -05001756 } else {
Theodore Ts'obd9926e2012-12-11 03:31:49 -05001757 memcpy(val, i->value, i->value_len);
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001758 /* Clear padding bytes. */
1759 memset(val + i->value_len, 0,
1760 new_size - i->value_len);
Theodore Ts'obd9926e2012-12-11 03:31:49 -05001761 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001762 }
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001763 here->e_value_size = cpu_to_le32(i->value_len);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001764 }
Tahsin Erdogandaf83282017-06-22 11:52:03 -04001765
Tahsin Erdogan32aaf192017-08-14 08:30:06 -04001766update_hash:
Tahsin Erdoganb9fc7612017-06-22 11:53:15 -04001767 if (i->value) {
1768 __le32 hash = 0;
1769
1770 /* Entry hash calculation. */
1771 if (in_inode) {
1772 __le32 crc32c_hash;
1773
1774 /*
1775 * Feed crc32c hash instead of the raw value for entry
1776 * hash calculation. This is to avoid walking
1777 * potentially long value buffer again.
1778 */
1779 crc32c_hash = cpu_to_le32(
1780 ext4_xattr_inode_get_hash(new_ea_inode));
1781 hash = ext4_xattr_hash_entry(here->e_name,
1782 here->e_name_len,
1783 &crc32c_hash, 1);
1784 } else if (is_block) {
Tahsin Erdogan32aaf192017-08-14 08:30:06 -04001785 __le32 *value = s->base + le16_to_cpu(
1786 here->e_value_offs);
Tahsin Erdoganb9fc7612017-06-22 11:53:15 -04001787
1788 hash = ext4_xattr_hash_entry(here->e_name,
1789 here->e_name_len, value,
1790 new_size >> 2);
1791 }
1792 here->e_hash = hash;
Tahsin Erdogandaf83282017-06-22 11:52:03 -04001793 }
1794
Tahsin Erdoganb9fc7612017-06-22 11:53:15 -04001795 if (is_block)
1796 ext4_xattr_rehash((struct ext4_xattr_header *)s->base);
1797
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001798 ret = 0;
Andreas Dilgere50e5122017-06-21 21:10:32 -04001799out:
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001800 iput(old_ea_inode);
1801 iput(new_ea_inode);
1802 return ret;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001803}
1804
Mingming Cao617ba132006-10-11 01:20:53 -07001805struct ext4_xattr_block_find {
1806 struct ext4_xattr_search s;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001807 struct buffer_head *bh;
1808};
1809
1810static int
Mingming Cao617ba132006-10-11 01:20:53 -07001811ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i,
1812 struct ext4_xattr_block_find *bs)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001813{
1814 struct super_block *sb = inode->i_sb;
1815 int error;
1816
1817 ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld",
1818 i->name_index, i->name, i->value, (long)i->value_len);
1819
Mingming Cao617ba132006-10-11 01:20:53 -07001820 if (EXT4_I(inode)->i_file_acl) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001821 /* The inode already has an extended attribute block. */
Theodore Ts'ofb265c9c2018-11-25 17:20:31 -05001822 bs->bh = ext4_sb_bread(sb, EXT4_I(inode)->i_file_acl, REQ_PRIO);
1823 if (IS_ERR(bs->bh))
1824 return PTR_ERR(bs->bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001825 ea_bdebug(bs->bh, "b_count=%d, refcount=%d",
1826 atomic_read(&(bs->bh->b_count)),
1827 le32_to_cpu(BHDR(bs->bh)->h_refcount));
Theodore Ts'ode05ca82018-03-30 15:42:25 -04001828 error = ext4_xattr_check_block(inode, bs->bh);
1829 if (error)
Theodore Ts'ofb265c9c2018-11-25 17:20:31 -05001830 return error;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001831 /* Find the named attribute. */
1832 bs->s.base = BHDR(bs->bh);
1833 bs->s.first = BFIRST(bs->bh);
1834 bs->s.end = bs->bh->b_data + bs->bh->b_size;
1835 bs->s.here = bs->s.first;
Theodore Ts'o9496005d2018-03-30 20:00:56 -04001836 error = xattr_find_entry(inode, &bs->s.here, bs->s.end,
1837 i->name_index, i->name, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001838 if (error && error != -ENODATA)
Theodore Ts'ofb265c9c2018-11-25 17:20:31 -05001839 return error;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001840 bs->s.not_found = error;
1841 }
Theodore Ts'ofb265c9c2018-11-25 17:20:31 -05001842 return 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001843}
1844
1845static int
Mingming Cao617ba132006-10-11 01:20:53 -07001846ext4_xattr_block_set(handle_t *handle, struct inode *inode,
1847 struct ext4_xattr_info *i,
1848 struct ext4_xattr_block_find *bs)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001849{
1850 struct super_block *sb = inode->i_sb;
1851 struct buffer_head *new_bh = NULL;
Tahsin Erdoganb347e2b2017-06-21 22:20:32 -04001852 struct ext4_xattr_search s_copy = bs->s;
1853 struct ext4_xattr_search *s = &s_copy;
Jan Kara7a2508e2016-02-22 22:35:22 -05001854 struct mb_cache_entry *ce = NULL;
Mingming Cao8a2bfdc2007-02-28 20:13:35 -08001855 int error = 0;
Tahsin Erdogan47387402017-06-22 11:28:55 -04001856 struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode);
Tahsin Erdogana6d05672017-08-24 14:25:02 -04001857 struct inode *ea_inode = NULL, *tmp_inode;
1858 size_t old_ea_inode_quota = 0;
1859 unsigned int ea_ino;
1860
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001861
Mingming Cao617ba132006-10-11 01:20:53 -07001862#define header(x) ((struct ext4_xattr_header *)(x))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001863
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001864 if (s->base) {
liang xie5d601252014-05-12 22:06:43 -04001865 BUFFER_TRACE(bs->bh, "get_write_access");
Mingming Cao8a2bfdc2007-02-28 20:13:35 -08001866 error = ext4_journal_get_write_access(handle, bs->bh);
1867 if (error)
1868 goto cleanup;
1869 lock_buffer(bs->bh);
1870
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001871 if (header(s->base)->h_refcount == cpu_to_le32(1)) {
Jan Kara82939d72016-02-22 11:50:13 -05001872 __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash);
1873
1874 /*
1875 * This must happen under buffer lock for
1876 * ext4_xattr_block_set() to reliably detect modified
1877 * block
1878 */
Tahsin Erdogancdb7ee42017-06-22 11:55:14 -04001879 if (ea_block_cache)
1880 mb_cache_entry_delete(ea_block_cache, hash,
1881 bs->bh->b_blocknr);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001882 ea_bdebug(bs->bh, "modifying in-place");
Tahsin Erdogandaf83282017-06-22 11:52:03 -04001883 error = ext4_xattr_set_entry(i, s, handle, inode,
1884 true /* is_block */);
Theodore Ts'odac7a4b2017-03-25 17:22:47 -04001885 ext4_xattr_block_csum_set(inode, bs->bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001886 unlock_buffer(bs->bh);
Darrick J. Wong6a797d22015-10-17 16:16:04 -04001887 if (error == -EFSCORRUPTED)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001888 goto bad_block;
1889 if (!error)
Theodore Ts'odac7a4b2017-03-25 17:22:47 -04001890 error = ext4_handle_dirty_metadata(handle,
1891 inode,
1892 bs->bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001893 if (error)
1894 goto cleanup;
1895 goto inserted;
1896 } else {
1897 int offset = (char *)s->here - bs->bh->b_data;
1898
Mingming Cao8a2bfdc2007-02-28 20:13:35 -08001899 unlock_buffer(bs->bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001900 ea_bdebug(bs->bh, "cloning");
Josef Bacik216553c2008-04-29 22:02:02 -04001901 s->base = kmalloc(bs->bh->b_size, GFP_NOFS);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001902 error = -ENOMEM;
1903 if (s->base == NULL)
1904 goto cleanup;
1905 memcpy(s->base, BHDR(bs->bh), bs->bh->b_size);
1906 s->first = ENTRY(header(s->base)+1);
1907 header(s->base)->h_refcount = cpu_to_le32(1);
1908 s->here = ENTRY(s->base + offset);
1909 s->end = s->base + bs->bh->b_size;
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001910
1911 /*
1912 * If existing entry points to an xattr inode, we need
1913 * to prevent ext4_xattr_set_entry() from decrementing
1914 * ref count on it because the reference belongs to the
1915 * original block. In this case, make the entry look
1916 * like it has an empty value.
1917 */
1918 if (!s->not_found && s->here->e_value_inum) {
Tahsin Erdogana6d05672017-08-24 14:25:02 -04001919 ea_ino = le32_to_cpu(s->here->e_value_inum);
1920 error = ext4_xattr_inode_iget(inode, ea_ino,
1921 le32_to_cpu(s->here->e_hash),
1922 &tmp_inode);
1923 if (error)
1924 goto cleanup;
1925
1926 if (!ext4_test_inode_state(tmp_inode,
1927 EXT4_STATE_LUSTRE_EA_INODE)) {
1928 /*
1929 * Defer quota free call for previous
1930 * inode until success is guaranteed.
1931 */
1932 old_ea_inode_quota = le32_to_cpu(
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001933 s->here->e_value_size);
Tahsin Erdogana6d05672017-08-24 14:25:02 -04001934 }
1935 iput(tmp_inode);
1936
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001937 s->here->e_value_inum = 0;
1938 s->here->e_value_size = 0;
1939 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001940 }
1941 } else {
1942 /* Allocate a buffer where we construct the new block. */
Josef Bacik216553c2008-04-29 22:02:02 -04001943 s->base = kzalloc(sb->s_blocksize, GFP_NOFS);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001944 /* assert(header == s->base) */
1945 error = -ENOMEM;
1946 if (s->base == NULL)
1947 goto cleanup;
Mingming Cao617ba132006-10-11 01:20:53 -07001948 header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001949 header(s->base)->h_blocks = cpu_to_le32(1);
1950 header(s->base)->h_refcount = cpu_to_le32(1);
1951 s->first = ENTRY(header(s->base)+1);
1952 s->here = ENTRY(header(s->base)+1);
1953 s->end = s->base + sb->s_blocksize;
1954 }
1955
Tahsin Erdogandaf83282017-06-22 11:52:03 -04001956 error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */);
Darrick J. Wong6a797d22015-10-17 16:16:04 -04001957 if (error == -EFSCORRUPTED)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001958 goto bad_block;
1959 if (error)
1960 goto cleanup;
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001961
1962 if (i->value && s->here->e_value_inum) {
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001963 /*
1964 * A ref count on ea_inode has been taken as part of the call to
1965 * ext4_xattr_set_entry() above. We would like to drop this
1966 * extra ref but we have to wait until the xattr block is
1967 * initialized and has its own ref count on the ea_inode.
1968 */
1969 ea_ino = le32_to_cpu(s->here->e_value_inum);
Tahsin Erdogana6d05672017-08-24 14:25:02 -04001970 error = ext4_xattr_inode_iget(inode, ea_ino,
1971 le32_to_cpu(s->here->e_hash),
1972 &ea_inode);
Tahsin Erdogandec214d2017-06-22 11:44:55 -04001973 if (error) {
1974 ea_inode = NULL;
1975 goto cleanup;
1976 }
1977 }
1978
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001979inserted:
1980 if (!IS_LAST_ENTRY(s->first)) {
Tahsin Erdogan47387402017-06-22 11:28:55 -04001981 new_bh = ext4_xattr_block_cache_find(inode, header(s->base),
1982 &ce);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001983 if (new_bh) {
1984 /* We found an identical block in the cache. */
1985 if (new_bh == bs->bh)
1986 ea_bdebug(new_bh, "keeping");
1987 else {
Andreas Gruenbacher6048c642016-02-22 22:44:04 -05001988 u32 ref;
1989
Tahsin Erdoganb8cb5a52017-05-24 18:24:07 -04001990 WARN_ON_ONCE(dquot_initialize_needed(inode));
1991
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001992 /* The old block is released after updating
1993 the inode. */
Lukas Czerner1231b3a2013-02-18 12:12:07 -05001994 error = dquot_alloc_block(inode,
1995 EXT4_C2B(EXT4_SB(sb), 1));
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001996 if (error)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001997 goto cleanup;
liang xie5d601252014-05-12 22:06:43 -04001998 BUFFER_TRACE(new_bh, "get_write_access");
Mingming Cao617ba132006-10-11 01:20:53 -07001999 error = ext4_journal_get_write_access(handle,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002000 new_bh);
2001 if (error)
2002 goto cleanup_dquot;
2003 lock_buffer(new_bh);
Jan Kara82939d72016-02-22 11:50:13 -05002004 /*
2005 * We have to be careful about races with
Andreas Gruenbacher6048c642016-02-22 22:44:04 -05002006 * freeing, rehashing or adding references to
2007 * xattr block. Once we hold buffer lock xattr
2008 * block's state is stable so we can check
2009 * whether the block got freed / rehashed or
2010 * not. Since we unhash mbcache entry under
2011 * buffer lock when freeing / rehashing xattr
2012 * block, checking whether entry is still
2013 * hashed is reliable. Same rules hold for
2014 * e_reusable handling.
Jan Kara82939d72016-02-22 11:50:13 -05002015 */
Andreas Gruenbacher6048c642016-02-22 22:44:04 -05002016 if (hlist_bl_unhashed(&ce->e_hash_list) ||
2017 !ce->e_reusable) {
Jan Kara82939d72016-02-22 11:50:13 -05002018 /*
2019 * Undo everything and check mbcache
2020 * again.
2021 */
2022 unlock_buffer(new_bh);
2023 dquot_free_block(inode,
2024 EXT4_C2B(EXT4_SB(sb),
2025 1));
2026 brelse(new_bh);
Tahsin Erdogan47387402017-06-22 11:28:55 -04002027 mb_cache_entry_put(ea_block_cache, ce);
Jan Kara82939d72016-02-22 11:50:13 -05002028 ce = NULL;
2029 new_bh = NULL;
2030 goto inserted;
2031 }
Andreas Gruenbacher6048c642016-02-22 22:44:04 -05002032 ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1;
2033 BHDR(new_bh)->h_refcount = cpu_to_le32(ref);
2034 if (ref >= EXT4_XATTR_REFCOUNT_MAX)
2035 ce->e_reusable = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002036 ea_bdebug(new_bh, "reusing; refcount now=%d",
Andreas Gruenbacher6048c642016-02-22 22:44:04 -05002037 ref);
Theodore Ts'odac7a4b2017-03-25 17:22:47 -04002038 ext4_xattr_block_csum_set(inode, new_bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002039 unlock_buffer(new_bh);
Theodore Ts'odac7a4b2017-03-25 17:22:47 -04002040 error = ext4_handle_dirty_metadata(handle,
2041 inode,
2042 new_bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002043 if (error)
2044 goto cleanup_dquot;
2045 }
Tahsin Erdogan47387402017-06-22 11:28:55 -04002046 mb_cache_entry_touch(ea_block_cache, ce);
2047 mb_cache_entry_put(ea_block_cache, ce);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002048 ce = NULL;
2049 } else if (bs->bh && s->base == bs->bh->b_data) {
2050 /* We were modifying this block in-place. */
2051 ea_bdebug(bs->bh, "keeping this block");
Tahsin Erdoganec000222017-08-05 22:41:42 -04002052 ext4_xattr_block_cache_insert(ea_block_cache, bs->bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002053 new_bh = bs->bh;
2054 get_bh(new_bh);
2055 } else {
2056 /* We need to allocate a new block */
Eric Sandeenfb0a3872009-09-16 14:45:10 -04002057 ext4_fsblk_t goal, block;
2058
Tahsin Erdoganb8cb5a52017-05-24 18:24:07 -04002059 WARN_ON_ONCE(dquot_initialize_needed(inode));
2060
Eric Sandeenfb0a3872009-09-16 14:45:10 -04002061 goal = ext4_group_first_block_no(sb,
Akinobu Mitad00a6d72008-04-17 10:38:59 -04002062 EXT4_I(inode)->i_block_group);
Eric Sandeenfb0a3872009-09-16 14:45:10 -04002063
2064 /* non-extent files can't have physical blocks past 2^32 */
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04002065 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
Eric Sandeenfb0a3872009-09-16 14:45:10 -04002066 goal = goal & EXT4_MAX_BLOCK_FILE_PHYS;
2067
Allison Henderson55f020d2011-05-25 07:41:26 -04002068 block = ext4_new_meta_blocks(handle, inode, goal, 0,
2069 NULL, &error);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002070 if (error)
2071 goto cleanup;
Eric Sandeenfb0a3872009-09-16 14:45:10 -04002072
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04002073 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
Eric Sandeenfb0a3872009-09-16 14:45:10 -04002074 BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS);
2075
Joe Perchesace36ad2012-03-19 23:11:43 -04002076 ea_idebug(inode, "creating block %llu",
2077 (unsigned long long)block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002078
2079 new_bh = sb_getblk(sb, block);
Wang Shilongaebf0242013-01-12 16:28:47 -05002080 if (unlikely(!new_bh)) {
Theodore Ts'o860d21e2013-01-12 16:19:36 -05002081 error = -ENOMEM;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002082getblk_failed:
Peter Huewe7dc57612011-02-21 21:01:42 -05002083 ext4_free_blocks(handle, inode, NULL, block, 1,
Theodore Ts'oe6362602009-11-23 07:17:05 -05002084 EXT4_FREE_BLOCKS_METADATA);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002085 goto cleanup;
2086 }
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002087 error = ext4_xattr_inode_inc_ref_all(handle, inode,
2088 ENTRY(header(s->base)+1));
2089 if (error)
2090 goto getblk_failed;
2091 if (ea_inode) {
2092 /* Drop the extra ref on ea_inode. */
2093 error = ext4_xattr_inode_dec_ref(handle,
2094 ea_inode);
2095 if (error)
2096 ext4_warning_inode(ea_inode,
2097 "dec ref error=%d",
2098 error);
2099 iput(ea_inode);
2100 ea_inode = NULL;
2101 }
2102
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002103 lock_buffer(new_bh);
Mingming Cao617ba132006-10-11 01:20:53 -07002104 error = ext4_journal_get_create_access(handle, new_bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002105 if (error) {
2106 unlock_buffer(new_bh);
Theodore Ts'o860d21e2013-01-12 16:19:36 -05002107 error = -EIO;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002108 goto getblk_failed;
2109 }
2110 memcpy(new_bh->b_data, s->base, new_bh->b_size);
Theodore Ts'odac7a4b2017-03-25 17:22:47 -04002111 ext4_xattr_block_csum_set(inode, new_bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002112 set_buffer_uptodate(new_bh);
2113 unlock_buffer(new_bh);
Tahsin Erdogan47387402017-06-22 11:28:55 -04002114 ext4_xattr_block_cache_insert(ea_block_cache, new_bh);
Theodore Ts'odac7a4b2017-03-25 17:22:47 -04002115 error = ext4_handle_dirty_metadata(handle, inode,
2116 new_bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002117 if (error)
2118 goto cleanup;
2119 }
2120 }
2121
Tahsin Erdogana6d05672017-08-24 14:25:02 -04002122 if (old_ea_inode_quota)
2123 ext4_xattr_inode_free_quota(inode, NULL, old_ea_inode_quota);
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002124
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002125 /* Update the inode. */
Mingming Cao617ba132006-10-11 01:20:53 -07002126 EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002127
2128 /* Drop the previous xattr block. */
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002129 if (bs->bh && bs->bh != new_bh) {
2130 struct ext4_xattr_inode_array *ea_inode_array = NULL;
2131
2132 ext4_xattr_release_block(handle, inode, bs->bh,
2133 &ea_inode_array,
2134 0 /* extra_credits */);
2135 ext4_xattr_inode_array_free(ea_inode_array);
2136 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002137 error = 0;
2138
2139cleanup:
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002140 if (ea_inode) {
2141 int error2;
2142
2143 error2 = ext4_xattr_inode_dec_ref(handle, ea_inode);
2144 if (error2)
2145 ext4_warning_inode(ea_inode, "dec ref error=%d",
2146 error2);
2147
2148 /* If there was an error, revert the quota charge. */
2149 if (error)
Tahsin Erdogana6d05672017-08-24 14:25:02 -04002150 ext4_xattr_inode_free_quota(inode, ea_inode,
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002151 i_size_read(ea_inode));
2152 iput(ea_inode);
2153 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002154 if (ce)
Tahsin Erdogan47387402017-06-22 11:28:55 -04002155 mb_cache_entry_put(ea_block_cache, ce);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002156 brelse(new_bh);
2157 if (!(bs->bh && s->base == bs->bh->b_data))
2158 kfree(s->base);
2159
2160 return error;
2161
2162cleanup_dquot:
Lukas Czerner1231b3a2013-02-18 12:12:07 -05002163 dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002164 goto cleanup;
2165
2166bad_block:
Theodore Ts'o24676da2010-05-16 21:00:00 -04002167 EXT4_ERROR_INODE(inode, "bad block %llu",
2168 EXT4_I(inode)->i_file_acl);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002169 goto cleanup;
2170
2171#undef header
2172}
2173
Tao Ma879b3822012-12-05 10:28:46 -05002174int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i,
2175 struct ext4_xattr_ibody_find *is)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002176{
Mingming Cao617ba132006-10-11 01:20:53 -07002177 struct ext4_xattr_ibody_header *header;
2178 struct ext4_inode *raw_inode;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002179 int error;
2180
Mingming Cao617ba132006-10-11 01:20:53 -07002181 if (EXT4_I(inode)->i_extra_isize == 0)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002182 return 0;
Mingming Cao617ba132006-10-11 01:20:53 -07002183 raw_inode = ext4_raw_inode(&is->iloc);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002184 header = IHDR(inode, raw_inode);
2185 is->s.base = is->s.first = IFIRST(header);
2186 is->s.here = is->s.first;
Mingming Cao617ba132006-10-11 01:20:53 -07002187 is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05002188 if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) {
Theodore Ts'o9e92f482016-03-22 16:13:15 -04002189 error = xattr_check_inode(inode, header, is->s.end);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002190 if (error)
2191 return error;
2192 /* Find the named attribute. */
Theodore Ts'o9496005d2018-03-30 20:00:56 -04002193 error = xattr_find_entry(inode, &is->s.here, is->s.end,
2194 i->name_index, i->name, 0);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002195 if (error && error != -ENODATA)
2196 return error;
2197 is->s.not_found = error;
2198 }
2199 return 0;
2200}
2201
Tao Ma0d812f72012-12-10 14:06:02 -05002202int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode,
2203 struct ext4_xattr_info *i,
2204 struct ext4_xattr_ibody_find *is)
2205{
2206 struct ext4_xattr_ibody_header *header;
2207 struct ext4_xattr_search *s = &is->s;
2208 int error;
2209
2210 if (EXT4_I(inode)->i_extra_isize == 0)
2211 return -ENOSPC;
Tahsin Erdogandaf83282017-06-22 11:52:03 -04002212 error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */);
Theodore Ts'o8bc13792018-06-16 23:41:59 -04002213 if (error)
2214 return error;
Tao Ma0d812f72012-12-10 14:06:02 -05002215 header = IHDR(inode, ext4_raw_inode(&is->iloc));
2216 if (!IS_LAST_ENTRY(s->first)) {
2217 header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC);
2218 ext4_set_inode_state(inode, EXT4_STATE_XATTR);
2219 } else {
2220 header->h_magic = cpu_to_le32(0);
2221 ext4_clear_inode_state(inode, EXT4_STATE_XATTR);
2222 }
2223 return 0;
2224}
2225
Andreas Dilgere50e5122017-06-21 21:10:32 -04002226static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode,
Tao Ma0d812f72012-12-10 14:06:02 -05002227 struct ext4_xattr_info *i,
2228 struct ext4_xattr_ibody_find *is)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002229{
Mingming Cao617ba132006-10-11 01:20:53 -07002230 struct ext4_xattr_ibody_header *header;
2231 struct ext4_xattr_search *s = &is->s;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002232 int error;
2233
Mingming Cao617ba132006-10-11 01:20:53 -07002234 if (EXT4_I(inode)->i_extra_isize == 0)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002235 return -ENOSPC;
Tahsin Erdogandaf83282017-06-22 11:52:03 -04002236 error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002237 if (error)
2238 return error;
Mingming Cao617ba132006-10-11 01:20:53 -07002239 header = IHDR(inode, ext4_raw_inode(&is->iloc));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002240 if (!IS_LAST_ENTRY(s->first)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002241 header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC);
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05002242 ext4_set_inode_state(inode, EXT4_STATE_XATTR);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002243 } else {
2244 header->h_magic = cpu_to_le32(0);
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05002245 ext4_clear_inode_state(inode, EXT4_STATE_XATTR);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002246 }
2247 return 0;
2248}
2249
Jan Kara3fd16462016-02-22 22:43:04 -05002250static int ext4_xattr_value_same(struct ext4_xattr_search *s,
2251 struct ext4_xattr_info *i)
2252{
2253 void *value;
2254
Tahsin Erdogan0bd454c2017-06-21 22:02:06 -04002255 /* When e_value_inum is set the value is stored externally. */
2256 if (s->here->e_value_inum)
2257 return 0;
Jan Kara3fd16462016-02-22 22:43:04 -05002258 if (le32_to_cpu(s->here->e_value_size) != i->value_len)
2259 return 0;
2260 value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs);
2261 return !memcmp(value, i->value, i->value_len);
2262}
2263
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002264static struct buffer_head *ext4_xattr_get_block(struct inode *inode)
2265{
2266 struct buffer_head *bh;
2267 int error;
2268
2269 if (!EXT4_I(inode)->i_file_acl)
2270 return NULL;
Theodore Ts'ofb265c9c2018-11-25 17:20:31 -05002271 bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO);
2272 if (IS_ERR(bh))
2273 return bh;
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002274 error = ext4_xattr_check_block(inode, bh);
Vasily Averinecaaf402018-11-07 11:01:33 -05002275 if (error) {
2276 brelse(bh);
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002277 return ERR_PTR(error);
Vasily Averinecaaf402018-11-07 11:01:33 -05002278 }
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002279 return bh;
2280}
2281
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002282/*
Mingming Cao617ba132006-10-11 01:20:53 -07002283 * ext4_xattr_set_handle()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002284 *
Wang Sheng-Hui6e9510b2011-01-10 12:10:30 -05002285 * Create, replace or remove an extended attribute for this inode. Value
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002286 * is NULL to remove an existing extended attribute, and non-NULL to
2287 * either replace an existing extended attribute, or create a new extended
2288 * attribute. The flags XATTR_REPLACE and XATTR_CREATE
2289 * specify that an extended attribute must exist and must not exist
2290 * previous to the call, respectively.
2291 *
2292 * Returns 0, or a negative error number on failure.
2293 */
2294int
Mingming Cao617ba132006-10-11 01:20:53 -07002295ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002296 const char *name, const void *value, size_t value_len,
2297 int flags)
2298{
Mingming Cao617ba132006-10-11 01:20:53 -07002299 struct ext4_xattr_info i = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002300 .name_index = name_index,
2301 .name = name,
2302 .value = value,
2303 .value_len = value_len,
Andreas Dilgere50e5122017-06-21 21:10:32 -04002304 .in_inode = 0,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002305 };
Mingming Cao617ba132006-10-11 01:20:53 -07002306 struct ext4_xattr_ibody_find is = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002307 .s = { .not_found = -ENODATA, },
2308 };
Mingming Cao617ba132006-10-11 01:20:53 -07002309 struct ext4_xattr_block_find bs = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002310 .s = { .not_found = -ENODATA, },
2311 };
Theodore Ts'oc755e252017-01-11 21:50:46 -05002312 int no_expand;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002313 int error;
2314
2315 if (!name)
2316 return -EINVAL;
2317 if (strlen(name) > 255)
2318 return -ERANGE;
Tahsin Erdoganb8cb5a52017-05-24 18:24:07 -04002319
Theodore Ts'oc755e252017-01-11 21:50:46 -05002320 ext4_write_lock_xattr(inode, &no_expand);
Kalpak Shah4d20c682008-10-08 23:21:54 -04002321
Tahsin Erdoganc1a5d5f2017-06-21 22:28:40 -04002322 /* Check journal credits under write lock. */
2323 if (ext4_handle_valid(handle)) {
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002324 struct buffer_head *bh;
Tahsin Erdoganc1a5d5f2017-06-21 22:28:40 -04002325 int credits;
2326
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002327 bh = ext4_xattr_get_block(inode);
2328 if (IS_ERR(bh)) {
2329 error = PTR_ERR(bh);
2330 goto cleanup;
2331 }
2332
Tahsin Erdoganaf652072017-07-06 00:01:59 -04002333 credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh,
2334 value_len,
2335 flags & XATTR_CREATE);
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002336 brelse(bh);
2337
Tahsin Erdoganc1a5d5f2017-06-21 22:28:40 -04002338 if (!ext4_handle_has_enough_credits(handle, credits)) {
2339 error = -ENOSPC;
2340 goto cleanup;
2341 }
2342 }
2343
Eric Sandeen66543612011-10-26 03:32:07 -04002344 error = ext4_reserve_inode_write(handle, inode, &is.iloc);
Eric Sandeen86ebfd02009-11-15 15:30:52 -05002345 if (error)
2346 goto cleanup;
2347
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05002348 if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002349 struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc);
2350 memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size);
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05002351 ext4_clear_inode_state(inode, EXT4_STATE_NEW);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002352 }
2353
Mingming Cao617ba132006-10-11 01:20:53 -07002354 error = ext4_xattr_ibody_find(inode, &i, &is);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002355 if (error)
2356 goto cleanup;
2357 if (is.s.not_found)
Mingming Cao617ba132006-10-11 01:20:53 -07002358 error = ext4_xattr_block_find(inode, &i, &bs);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002359 if (error)
2360 goto cleanup;
2361 if (is.s.not_found && bs.s.not_found) {
2362 error = -ENODATA;
2363 if (flags & XATTR_REPLACE)
2364 goto cleanup;
2365 error = 0;
2366 if (!value)
2367 goto cleanup;
2368 } else {
2369 error = -EEXIST;
2370 if (flags & XATTR_CREATE)
2371 goto cleanup;
2372 }
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002373
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002374 if (!value) {
2375 if (!is.s.not_found)
Andreas Dilgere50e5122017-06-21 21:10:32 -04002376 error = ext4_xattr_ibody_set(handle, inode, &i, &is);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002377 else if (!bs.s.not_found)
Mingming Cao617ba132006-10-11 01:20:53 -07002378 error = ext4_xattr_block_set(handle, inode, &i, &bs);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002379 } else {
Jan Kara3fd16462016-02-22 22:43:04 -05002380 error = 0;
2381 /* Xattr value did not change? Save us some work and bail out */
2382 if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i))
2383 goto cleanup;
2384 if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i))
2385 goto cleanup;
2386
Tahsin Erdoganb347e2b2017-06-21 22:20:32 -04002387 if (ext4_has_feature_ea_inode(inode->i_sb) &&
2388 (EXT4_XATTR_SIZE(i.value_len) >
2389 EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize)))
2390 i.in_inode = 1;
2391retry_inode:
Andreas Dilgere50e5122017-06-21 21:10:32 -04002392 error = ext4_xattr_ibody_set(handle, inode, &i, &is);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002393 if (!error && !bs.s.not_found) {
2394 i.value = NULL;
Mingming Cao617ba132006-10-11 01:20:53 -07002395 error = ext4_xattr_block_set(handle, inode, &i, &bs);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002396 } else if (error == -ENOSPC) {
Tiger Yang7e01c8e2008-05-14 16:05:47 -07002397 if (EXT4_I(inode)->i_file_acl && !bs.s.base) {
Vasily Averin45ae9322018-11-07 11:07:01 -05002398 brelse(bs.bh);
2399 bs.bh = NULL;
Tiger Yang7e01c8e2008-05-14 16:05:47 -07002400 error = ext4_xattr_block_find(inode, &i, &bs);
2401 if (error)
2402 goto cleanup;
2403 }
Mingming Cao617ba132006-10-11 01:20:53 -07002404 error = ext4_xattr_block_set(handle, inode, &i, &bs);
Tahsin Erdoganb347e2b2017-06-21 22:20:32 -04002405 if (!error && !is.s.not_found) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002406 i.value = NULL;
Andreas Dilgere50e5122017-06-21 21:10:32 -04002407 error = ext4_xattr_ibody_set(handle, inode, &i,
2408 &is);
Tahsin Erdoganb347e2b2017-06-21 22:20:32 -04002409 } else if (error == -ENOSPC) {
2410 /*
2411 * Xattr does not fit in the block, store at
2412 * external inode if possible.
2413 */
2414 if (ext4_has_feature_ea_inode(inode->i_sb) &&
2415 !i.in_inode) {
2416 i.in_inode = 1;
2417 goto retry_inode;
2418 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002419 }
2420 }
2421 }
2422 if (!error) {
Mingming Cao617ba132006-10-11 01:20:53 -07002423 ext4_xattr_update_super_block(handle, inode->i_sb);
Deepa Dinamanieeca7ea2016-11-14 21:40:10 -05002424 inode->i_ctime = current_time(inode);
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002425 if (!value)
Theodore Ts'oc755e252017-01-11 21:50:46 -05002426 no_expand = 0;
Mingming Cao617ba132006-10-11 01:20:53 -07002427 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002428 /*
Mingming Cao617ba132006-10-11 01:20:53 -07002429 * The bh is consumed by ext4_mark_iloc_dirty, even with
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002430 * error != 0.
2431 */
2432 is.iloc.bh = NULL;
2433 if (IS_SYNC(inode))
Frank Mayhar03901312009-01-07 00:06:22 -05002434 ext4_handle_sync(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002435 }
2436
2437cleanup:
2438 brelse(is.iloc.bh);
2439 brelse(bs.bh);
Theodore Ts'oc755e252017-01-11 21:50:46 -05002440 ext4_write_unlock_xattr(inode, &no_expand);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002441 return error;
2442}
2443
Tahsin Erdoganaf652072017-07-06 00:01:59 -04002444int ext4_xattr_set_credits(struct inode *inode, size_t value_len,
2445 bool is_create, int *credits)
Tahsin Erdoganc1a5d5f2017-06-21 22:28:40 -04002446{
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002447 struct buffer_head *bh;
2448 int err;
Tahsin Erdoganc1a5d5f2017-06-21 22:28:40 -04002449
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002450 *credits = 0;
2451
2452 if (!EXT4_SB(inode->i_sb)->s_journal)
Tahsin Erdoganc1a5d5f2017-06-21 22:28:40 -04002453 return 0;
2454
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002455 down_read(&EXT4_I(inode)->xattr_sem);
Tahsin Erdoganc1a5d5f2017-06-21 22:28:40 -04002456
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002457 bh = ext4_xattr_get_block(inode);
2458 if (IS_ERR(bh)) {
2459 err = PTR_ERR(bh);
2460 } else {
Tahsin Erdoganaf652072017-07-06 00:01:59 -04002461 *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh,
2462 value_len, is_create);
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002463 brelse(bh);
2464 err = 0;
Tahsin Erdoganc1a5d5f2017-06-21 22:28:40 -04002465 }
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002466
2467 up_read(&EXT4_I(inode)->xattr_sem);
2468 return err;
Tahsin Erdoganc1a5d5f2017-06-21 22:28:40 -04002469}
2470
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002471/*
Mingming Cao617ba132006-10-11 01:20:53 -07002472 * ext4_xattr_set()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002473 *
Mingming Cao617ba132006-10-11 01:20:53 -07002474 * Like ext4_xattr_set_handle, but start from an inode. This extended
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002475 * attribute modification is a filesystem transaction by itself.
2476 *
2477 * Returns 0, or a negative error number on failure.
2478 */
2479int
Mingming Cao617ba132006-10-11 01:20:53 -07002480ext4_xattr_set(struct inode *inode, int name_index, const char *name,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002481 const void *value, size_t value_len, int flags)
2482{
2483 handle_t *handle;
Andreas Dilgere50e5122017-06-21 21:10:32 -04002484 struct super_block *sb = inode->i_sb;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002485 int error, retries = 0;
Tahsin Erdoganc1a5d5f2017-06-21 22:28:40 -04002486 int credits;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002487
Tahsin Erdoganb8cb5a52017-05-24 18:24:07 -04002488 error = dquot_initialize(inode);
2489 if (error)
2490 return error;
Andreas Dilgere50e5122017-06-21 21:10:32 -04002491
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002492retry:
Tahsin Erdoganaf652072017-07-06 00:01:59 -04002493 error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE,
2494 &credits);
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002495 if (error)
2496 return error;
2497
Theodore Ts'o9924a922013-02-08 21:59:22 -05002498 handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002499 if (IS_ERR(handle)) {
2500 error = PTR_ERR(handle);
2501 } else {
2502 int error2;
2503
Mingming Cao617ba132006-10-11 01:20:53 -07002504 error = ext4_xattr_set_handle(handle, inode, name_index, name,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002505 value, value_len, flags);
Mingming Cao617ba132006-10-11 01:20:53 -07002506 error2 = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002507 if (error == -ENOSPC &&
Andreas Dilgere50e5122017-06-21 21:10:32 -04002508 ext4_should_retry_alloc(sb, &retries))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002509 goto retry;
2510 if (error == 0)
2511 error = error2;
2512 }
2513
2514 return error;
2515}
2516
2517/*
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002518 * Shift the EA entries in the inode to create space for the increased
2519 * i_extra_isize.
2520 */
2521static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry,
2522 int value_offs_shift, void *to,
Jan Kara94405712016-08-29 15:41:11 -04002523 void *from, size_t n)
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002524{
2525 struct ext4_xattr_entry *last = entry;
2526 int new_offs;
2527
Jan Kara94405712016-08-29 15:41:11 -04002528 /* We always shift xattr headers further thus offsets get lower */
2529 BUG_ON(value_offs_shift > 0);
2530
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002531 /* Adjust the value offsets of the entries */
2532 for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) {
Andreas Dilgere50e5122017-06-21 21:10:32 -04002533 if (!last->e_value_inum && last->e_value_size) {
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002534 new_offs = le16_to_cpu(last->e_value_offs) +
2535 value_offs_shift;
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002536 last->e_value_offs = cpu_to_le16(new_offs);
2537 }
2538 }
2539 /* Shift the entries by n bytes */
2540 memmove(to, from, n);
2541}
2542
2543/*
Jan Kara3f2571c2016-08-29 15:42:11 -04002544 * Move xattr pointed to by 'entry' from inode into external xattr block
2545 */
2546static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode,
2547 struct ext4_inode *raw_inode,
2548 struct ext4_xattr_entry *entry)
2549{
2550 struct ext4_xattr_ibody_find *is = NULL;
2551 struct ext4_xattr_block_find *bs = NULL;
2552 char *buffer = NULL, *b_entry_name = NULL;
Tahsin Erdoganf6109102017-06-21 22:11:54 -04002553 size_t value_size = le32_to_cpu(entry->e_value_size);
Jan Kara3f2571c2016-08-29 15:42:11 -04002554 struct ext4_xattr_info i = {
2555 .value = NULL,
2556 .value_len = 0,
2557 .name_index = entry->e_name_index,
Tahsin Erdoganf6109102017-06-21 22:11:54 -04002558 .in_inode = !!entry->e_value_inum,
Jan Kara3f2571c2016-08-29 15:42:11 -04002559 };
2560 struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode);
2561 int error;
2562
Jan Kara3f2571c2016-08-29 15:42:11 -04002563 is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS);
2564 bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS);
2565 buffer = kmalloc(value_size, GFP_NOFS);
2566 b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS);
2567 if (!is || !bs || !buffer || !b_entry_name) {
2568 error = -ENOMEM;
2569 goto out;
2570 }
2571
2572 is->s.not_found = -ENODATA;
2573 bs->s.not_found = -ENODATA;
2574 is->iloc.bh = NULL;
2575 bs->bh = NULL;
2576
2577 /* Save the entry name and the entry value */
Tahsin Erdoganf6109102017-06-21 22:11:54 -04002578 if (entry->e_value_inum) {
Tahsin Erdoganb9fc7612017-06-22 11:53:15 -04002579 error = ext4_xattr_inode_get(inode, entry, buffer, value_size);
Tahsin Erdoganf6109102017-06-21 22:11:54 -04002580 if (error)
2581 goto out;
2582 } else {
2583 size_t value_offs = le16_to_cpu(entry->e_value_offs);
2584 memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size);
2585 }
2586
Jan Kara3f2571c2016-08-29 15:42:11 -04002587 memcpy(b_entry_name, entry->e_name, entry->e_name_len);
2588 b_entry_name[entry->e_name_len] = '\0';
2589 i.name = b_entry_name;
2590
2591 error = ext4_get_inode_loc(inode, &is->iloc);
2592 if (error)
2593 goto out;
2594
2595 error = ext4_xattr_ibody_find(inode, &i, is);
2596 if (error)
2597 goto out;
2598
2599 /* Remove the chosen entry from the inode */
Andreas Dilgere50e5122017-06-21 21:10:32 -04002600 error = ext4_xattr_ibody_set(handle, inode, &i, is);
Jan Kara3f2571c2016-08-29 15:42:11 -04002601 if (error)
2602 goto out;
2603
Jan Kara3f2571c2016-08-29 15:42:11 -04002604 i.value = buffer;
2605 i.value_len = value_size;
2606 error = ext4_xattr_block_find(inode, &i, bs);
2607 if (error)
2608 goto out;
2609
2610 /* Add entry which was removed from the inode into the block */
2611 error = ext4_xattr_block_set(handle, inode, &i, bs);
2612 if (error)
2613 goto out;
2614 error = 0;
2615out:
2616 kfree(b_entry_name);
2617 kfree(buffer);
2618 if (is)
2619 brelse(is->iloc.bh);
Vasily Averin6bdc9972018-11-07 11:10:21 -05002620 if (bs)
2621 brelse(bs->bh);
Jan Kara3f2571c2016-08-29 15:42:11 -04002622 kfree(is);
2623 kfree(bs);
2624
2625 return error;
2626}
2627
Jan Karadfa20642016-08-29 15:44:11 -04002628static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode,
2629 struct ext4_inode *raw_inode,
2630 int isize_diff, size_t ifree,
2631 size_t bfree, int *total_ino)
2632{
2633 struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode);
2634 struct ext4_xattr_entry *small_entry;
2635 struct ext4_xattr_entry *entry;
2636 struct ext4_xattr_entry *last;
2637 unsigned int entry_size; /* EA entry size */
2638 unsigned int total_size; /* EA entry size + value size */
2639 unsigned int min_total_size;
2640 int error;
2641
2642 while (isize_diff > ifree) {
2643 entry = NULL;
2644 small_entry = NULL;
2645 min_total_size = ~0U;
2646 last = IFIRST(header);
2647 /* Find the entry best suited to be pushed into EA block */
2648 for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) {
Theodore Ts'o8cdb5242018-06-16 15:40:48 -04002649 /* never move system.data out of the inode */
2650 if ((last->e_name_len == 4) &&
2651 (last->e_name_index == EXT4_XATTR_INDEX_SYSTEM) &&
2652 !memcmp(last->e_name, "data", 4))
2653 continue;
Tahsin Erdogan9bb21ce2017-06-21 22:05:44 -04002654 total_size = EXT4_XATTR_LEN(last->e_name_len);
2655 if (!last->e_value_inum)
2656 total_size += EXT4_XATTR_SIZE(
2657 le32_to_cpu(last->e_value_size));
Jan Karadfa20642016-08-29 15:44:11 -04002658 if (total_size <= bfree &&
2659 total_size < min_total_size) {
2660 if (total_size + ifree < isize_diff) {
2661 small_entry = last;
2662 } else {
2663 entry = last;
2664 min_total_size = total_size;
2665 }
2666 }
2667 }
2668
2669 if (entry == NULL) {
2670 if (small_entry == NULL)
2671 return -ENOSPC;
2672 entry = small_entry;
2673 }
2674
2675 entry_size = EXT4_XATTR_LEN(entry->e_name_len);
Tahsin Erdogan9bb21ce2017-06-21 22:05:44 -04002676 total_size = entry_size;
2677 if (!entry->e_value_inum)
2678 total_size += EXT4_XATTR_SIZE(
2679 le32_to_cpu(entry->e_value_size));
Jan Karadfa20642016-08-29 15:44:11 -04002680 error = ext4_xattr_move_to_block(handle, inode, raw_inode,
2681 entry);
2682 if (error)
2683 return error;
2684
2685 *total_ino -= entry_size;
2686 ifree += total_size;
2687 bfree -= total_size;
2688 }
2689
2690 return 0;
2691}
2692
Jan Kara3f2571c2016-08-29 15:42:11 -04002693/*
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002694 * Expand an inode by new_extra_isize bytes when EAs are present.
2695 * Returns 0 on success or negative error number on failure.
2696 */
2697int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
2698 struct ext4_inode *raw_inode, handle_t *handle)
2699{
2700 struct ext4_xattr_ibody_header *header;
Miao Xiecf0a5e82017-08-06 00:40:01 -04002701 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
2702 static unsigned int mnt_count;
Jan Karae3014d12016-08-29 15:38:11 -04002703 size_t min_offs;
2704 size_t ifree, bfree;
Theodore Ts'o7b1b2c12014-02-19 20:15:21 -05002705 int total_ino;
Jan Kara6e0cd082016-08-29 15:43:11 -04002706 void *base, *end;
Jan Karad0141192016-08-11 11:50:30 -04002707 int error = 0, tried_min_extra_isize = 0;
Miao Xiecf0a5e82017-08-06 00:40:01 -04002708 int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize);
Jan Karad0141192016-08-11 11:50:30 -04002709 int isize_diff; /* How much do we need to grow i_extra_isize */
Theodore Ts'oc755e252017-01-11 21:50:46 -05002710
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002711retry:
Jan Karad0141192016-08-11 11:50:30 -04002712 isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize;
Jan Kara2e81a4e2016-08-11 12:38:55 -04002713 if (EXT4_I(inode)->i_extra_isize >= new_extra_isize)
Miao Xieb640b2c2017-08-06 00:55:48 -04002714 return 0;
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002715
2716 header = IHDR(inode, raw_inode);
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002717
2718 /*
2719 * Check if enough free space is available in the inode to shift the
2720 * entries ahead by new_extra_isize.
2721 */
2722
Jan Kara6e0cd082016-08-29 15:43:11 -04002723 base = IFIRST(header);
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002724 end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
2725 min_offs = end - base;
Theodore Ts'oa805622a2018-12-19 12:28:13 -05002726 total_ino = sizeof(struct ext4_xattr_ibody_header) + sizeof(u32);
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002727
Theodore Ts'o9e92f482016-03-22 16:13:15 -04002728 error = xattr_check_inode(inode, header, end);
2729 if (error)
2730 goto cleanup;
2731
Jan Kara6e0cd082016-08-29 15:43:11 -04002732 ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino);
Jan Karae3014d12016-08-29 15:38:11 -04002733 if (ifree >= isize_diff)
2734 goto shift;
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002735
2736 /*
2737 * Enough free space isn't available in the inode, check if
2738 * EA block can hold new_extra_isize bytes.
2739 */
2740 if (EXT4_I(inode)->i_file_acl) {
Vasily Averin53692ec2018-11-07 11:14:35 -05002741 struct buffer_head *bh;
2742
Theodore Ts'ofb265c9c2018-11-25 17:20:31 -05002743 bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO);
2744 if (IS_ERR(bh)) {
2745 error = PTR_ERR(bh);
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002746 goto cleanup;
Theodore Ts'ofb265c9c2018-11-25 17:20:31 -05002747 }
Theodore Ts'ode05ca82018-03-30 15:42:25 -04002748 error = ext4_xattr_check_block(inode, bh);
Vasily Averin53692ec2018-11-07 11:14:35 -05002749 if (error) {
2750 brelse(bh);
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002751 goto cleanup;
Vasily Averin53692ec2018-11-07 11:14:35 -05002752 }
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002753 base = BHDR(bh);
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002754 end = bh->b_data + bh->b_size;
2755 min_offs = end - base;
Jan Kara6e0cd082016-08-29 15:43:11 -04002756 bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base,
2757 NULL);
Miao Xieb640b2c2017-08-06 00:55:48 -04002758 brelse(bh);
Jan Karae3014d12016-08-29 15:38:11 -04002759 if (bfree + ifree < isize_diff) {
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002760 if (!tried_min_extra_isize && s_min_extra_isize) {
2761 tried_min_extra_isize++;
2762 new_extra_isize = s_min_extra_isize;
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002763 goto retry;
2764 }
Jan Karadfa20642016-08-29 15:44:11 -04002765 error = -ENOSPC;
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002766 goto cleanup;
2767 }
2768 } else {
Jan Karae3014d12016-08-29 15:38:11 -04002769 bfree = inode->i_sb->s_blocksize;
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002770 }
2771
Jan Karadfa20642016-08-29 15:44:11 -04002772 error = ext4_xattr_make_inode_space(handle, inode, raw_inode,
2773 isize_diff, ifree, bfree,
2774 &total_ino);
2775 if (error) {
2776 if (error == -ENOSPC && !tried_min_extra_isize &&
2777 s_min_extra_isize) {
2778 tried_min_extra_isize++;
2779 new_extra_isize = s_min_extra_isize;
Jan Karadfa20642016-08-29 15:44:11 -04002780 goto retry;
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002781 }
Jan Karadfa20642016-08-29 15:44:11 -04002782 goto cleanup;
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002783 }
Jan Karae3014d12016-08-29 15:38:11 -04002784shift:
2785 /* Adjust the offsets and shift the remaining entries ahead */
Jan Kara6e0cd082016-08-29 15:43:11 -04002786 ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize
Jan Karae3014d12016-08-29 15:38:11 -04002787 - new_extra_isize, (void *)raw_inode +
2788 EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize,
Jan Kara94405712016-08-29 15:41:11 -04002789 (void *)header, total_ino);
Jan Karae3014d12016-08-29 15:38:11 -04002790 EXT4_I(inode)->i_extra_isize = new_extra_isize;
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002791
2792cleanup:
Miao Xieb640b2c2017-08-06 00:55:48 -04002793 if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) {
Miao Xiecf0a5e82017-08-06 00:40:01 -04002794 ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.",
2795 inode->i_ino);
2796 mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count);
2797 }
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002798 return error;
2799}
2800
Andreas Dilgere50e5122017-06-21 21:10:32 -04002801#define EIA_INCR 16 /* must be 2^n */
2802#define EIA_MASK (EIA_INCR - 1)
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002803
2804/* Add the large xattr @inode into @ea_inode_array for deferred iput().
Tahsin Erdogan0421a182017-06-22 10:26:31 -04002805 * If @ea_inode_array is new or full it will be grown and the old
Andreas Dilgere50e5122017-06-21 21:10:32 -04002806 * contents copied over.
2807 */
2808static int
Tahsin Erdogan0421a182017-06-22 10:26:31 -04002809ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array,
2810 struct inode *inode)
Andreas Dilgere50e5122017-06-21 21:10:32 -04002811{
Tahsin Erdogan0421a182017-06-22 10:26:31 -04002812 if (*ea_inode_array == NULL) {
Andreas Dilgere50e5122017-06-21 21:10:32 -04002813 /*
2814 * Start with 15 inodes, so it fits into a power-of-two size.
Tahsin Erdogan0421a182017-06-22 10:26:31 -04002815 * If *ea_inode_array is NULL, this is essentially offsetof()
Andreas Dilgere50e5122017-06-21 21:10:32 -04002816 */
Tahsin Erdogan0421a182017-06-22 10:26:31 -04002817 (*ea_inode_array) =
2818 kmalloc(offsetof(struct ext4_xattr_inode_array,
2819 inodes[EIA_MASK]),
Andreas Dilgere50e5122017-06-21 21:10:32 -04002820 GFP_NOFS);
Tahsin Erdogan0421a182017-06-22 10:26:31 -04002821 if (*ea_inode_array == NULL)
Andreas Dilgere50e5122017-06-21 21:10:32 -04002822 return -ENOMEM;
Tahsin Erdogan0421a182017-06-22 10:26:31 -04002823 (*ea_inode_array)->count = 0;
2824 } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) {
Andreas Dilgere50e5122017-06-21 21:10:32 -04002825 /* expand the array once all 15 + n * 16 slots are full */
Tahsin Erdogan0421a182017-06-22 10:26:31 -04002826 struct ext4_xattr_inode_array *new_array = NULL;
2827 int count = (*ea_inode_array)->count;
Andreas Dilgere50e5122017-06-21 21:10:32 -04002828
2829 /* if new_array is NULL, this is essentially offsetof() */
2830 new_array = kmalloc(
Tahsin Erdogan0421a182017-06-22 10:26:31 -04002831 offsetof(struct ext4_xattr_inode_array,
2832 inodes[count + EIA_INCR]),
Andreas Dilgere50e5122017-06-21 21:10:32 -04002833 GFP_NOFS);
2834 if (new_array == NULL)
2835 return -ENOMEM;
Tahsin Erdogan0421a182017-06-22 10:26:31 -04002836 memcpy(new_array, *ea_inode_array,
2837 offsetof(struct ext4_xattr_inode_array, inodes[count]));
2838 kfree(*ea_inode_array);
2839 *ea_inode_array = new_array;
Andreas Dilgere50e5122017-06-21 21:10:32 -04002840 }
Tahsin Erdogan0421a182017-06-22 10:26:31 -04002841 (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode;
Andreas Dilgere50e5122017-06-21 21:10:32 -04002842 return 0;
2843}
2844
Kalpak Shah6dd4ee72007-07-18 09:19:57 -04002845/*
Mingming Cao617ba132006-10-11 01:20:53 -07002846 * ext4_xattr_delete_inode()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002847 *
Andreas Dilgere50e5122017-06-21 21:10:32 -04002848 * Free extended attribute resources associated with this inode. Traverse
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002849 * all entries and decrement reference on any xattr inodes associated with this
2850 * inode. This is called immediately before an inode is freed. We have exclusive
2851 * access to the inode. If an orphan inode is deleted it will also release its
2852 * references on xattr block and xattr inodes.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002853 */
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002854int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode,
2855 struct ext4_xattr_inode_array **ea_inode_array,
2856 int extra_credits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002857{
2858 struct buffer_head *bh = NULL;
Andreas Dilgere50e5122017-06-21 21:10:32 -04002859 struct ext4_xattr_ibody_header *header;
Tahsin Erdogan30a7eb92017-06-22 11:42:09 -04002860 struct ext4_iloc iloc = { .bh = NULL };
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002861 struct ext4_xattr_entry *entry;
Tahsin Erdogana6d05672017-08-24 14:25:02 -04002862 struct inode *ea_inode;
Tahsin Erdogan30a7eb92017-06-22 11:42:09 -04002863 int error;
2864
2865 error = ext4_xattr_ensure_credits(handle, inode, extra_credits,
2866 NULL /* bh */,
2867 false /* dirty */,
2868 false /* block_csum */);
2869 if (error) {
2870 EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error);
2871 goto cleanup;
2872 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002873
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002874 if (ext4_has_feature_ea_inode(inode->i_sb) &&
2875 ext4_test_inode_state(inode, EXT4_STATE_XATTR)) {
Andreas Dilgere50e5122017-06-21 21:10:32 -04002876
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002877 error = ext4_get_inode_loc(inode, &iloc);
Tahsin Erdogan65d30002017-06-21 22:24:38 -04002878 if (error) {
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002879 EXT4_ERROR_INODE(inode, "inode loc (error %d)", error);
Andreas Dilgere50e5122017-06-21 21:10:32 -04002880 goto cleanup;
2881 }
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002882
2883 error = ext4_journal_get_write_access(handle, iloc.bh);
2884 if (error) {
2885 EXT4_ERROR_INODE(inode, "write access (error %d)",
2886 error);
2887 goto cleanup;
2888 }
2889
2890 header = IHDR(inode, ext4_raw_inode(&iloc));
2891 if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC))
2892 ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh,
2893 IFIRST(header),
2894 false /* block_csum */,
2895 ea_inode_array,
2896 extra_credits,
2897 false /* skip_quota */);
Andreas Dilgere50e5122017-06-21 21:10:32 -04002898 }
2899
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002900 if (EXT4_I(inode)->i_file_acl) {
Theodore Ts'ofb265c9c2018-11-25 17:20:31 -05002901 bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO);
2902 if (IS_ERR(bh)) {
2903 error = PTR_ERR(bh);
2904 if (error == -EIO)
2905 EXT4_ERROR_INODE(inode, "block %llu read error",
2906 EXT4_I(inode)->i_file_acl);
Dan Carpenter7159a982019-02-21 11:17:34 -05002907 bh = NULL;
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002908 goto cleanup;
2909 }
2910 error = ext4_xattr_check_block(inode, bh);
Theodore Ts'ode05ca82018-03-30 15:42:25 -04002911 if (error)
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002912 goto cleanup;
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002913
2914 if (ext4_has_feature_ea_inode(inode->i_sb)) {
2915 for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry);
Tahsin Erdogana6d05672017-08-24 14:25:02 -04002916 entry = EXT4_XATTR_NEXT(entry)) {
2917 if (!entry->e_value_inum)
2918 continue;
2919 error = ext4_xattr_inode_iget(inode,
2920 le32_to_cpu(entry->e_value_inum),
2921 le32_to_cpu(entry->e_hash),
2922 &ea_inode);
2923 if (error)
2924 continue;
2925 ext4_xattr_inode_free_quota(inode, ea_inode,
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002926 le32_to_cpu(entry->e_value_size));
Tahsin Erdogana6d05672017-08-24 14:25:02 -04002927 iput(ea_inode);
2928 }
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002929
2930 }
2931
2932 ext4_xattr_release_block(handle, inode, bh, ea_inode_array,
2933 extra_credits);
2934 /*
2935 * Update i_file_acl value in the same transaction that releases
2936 * block.
2937 */
2938 EXT4_I(inode)->i_file_acl = 0;
2939 error = ext4_mark_inode_dirty(handle, inode);
2940 if (error) {
2941 EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)",
2942 error);
2943 goto cleanup;
2944 }
Tahsin Erdogan30a7eb92017-06-22 11:42:09 -04002945 }
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002946 error = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002947cleanup:
Tahsin Erdogan30a7eb92017-06-22 11:42:09 -04002948 brelse(iloc.bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002949 brelse(bh);
Andreas Dilgere50e5122017-06-21 21:10:32 -04002950 return error;
2951}
2952
Tahsin Erdogan0421a182017-06-22 10:26:31 -04002953void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array)
Andreas Dilgere50e5122017-06-21 21:10:32 -04002954{
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002955 int idx;
Andreas Dilgere50e5122017-06-21 21:10:32 -04002956
Tahsin Erdogan0421a182017-06-22 10:26:31 -04002957 if (ea_inode_array == NULL)
Andreas Dilgere50e5122017-06-21 21:10:32 -04002958 return;
2959
Tahsin Erdogandec214d2017-06-22 11:44:55 -04002960 for (idx = 0; idx < ea_inode_array->count; ++idx)
2961 iput(ea_inode_array->inodes[idx]);
Tahsin Erdogan0421a182017-06-22 10:26:31 -04002962 kfree(ea_inode_array);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002963}
2964
2965/*
Tahsin Erdogan47387402017-06-22 11:28:55 -04002966 * ext4_xattr_block_cache_insert()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002967 *
Tahsin Erdogan47387402017-06-22 11:28:55 -04002968 * Create a new entry in the extended attribute block cache, and insert
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002969 * it unless such an entry is already in the cache.
2970 *
2971 * Returns 0, or a negative error number on failure.
2972 */
2973static void
Tahsin Erdogan47387402017-06-22 11:28:55 -04002974ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache,
2975 struct buffer_head *bh)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002976{
Andreas Gruenbacher6048c642016-02-22 22:44:04 -05002977 struct ext4_xattr_header *header = BHDR(bh);
2978 __u32 hash = le32_to_cpu(header->h_hash);
2979 int reusable = le32_to_cpu(header->h_refcount) <
2980 EXT4_XATTR_REFCOUNT_MAX;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002981 int error;
2982
Tahsin Erdogancdb7ee42017-06-22 11:55:14 -04002983 if (!ea_block_cache)
2984 return;
Tahsin Erdogan47387402017-06-22 11:28:55 -04002985 error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash,
Andreas Gruenbacher6048c642016-02-22 22:44:04 -05002986 bh->b_blocknr, reusable);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002987 if (error) {
Jan Kara82939d72016-02-22 11:50:13 -05002988 if (error == -EBUSY)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002989 ea_bdebug(bh, "already in cache");
Jan Kara82939d72016-02-22 11:50:13 -05002990 } else
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002991 ea_bdebug(bh, "inserting [%x]", (int)hash);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002992}
2993
2994/*
Mingming Cao617ba132006-10-11 01:20:53 -07002995 * ext4_xattr_cmp()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002996 *
2997 * Compare two extended attribute blocks for equality.
2998 *
2999 * Returns 0 if the blocks are equal, 1 if they differ, and
3000 * a negative error number on errors.
3001 */
3002static int
Mingming Cao617ba132006-10-11 01:20:53 -07003003ext4_xattr_cmp(struct ext4_xattr_header *header1,
3004 struct ext4_xattr_header *header2)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003005{
Mingming Cao617ba132006-10-11 01:20:53 -07003006 struct ext4_xattr_entry *entry1, *entry2;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003007
3008 entry1 = ENTRY(header1+1);
3009 entry2 = ENTRY(header2+1);
3010 while (!IS_LAST_ENTRY(entry1)) {
3011 if (IS_LAST_ENTRY(entry2))
3012 return 1;
3013 if (entry1->e_hash != entry2->e_hash ||
3014 entry1->e_name_index != entry2->e_name_index ||
3015 entry1->e_name_len != entry2->e_name_len ||
3016 entry1->e_value_size != entry2->e_value_size ||
Andreas Dilgere50e5122017-06-21 21:10:32 -04003017 entry1->e_value_inum != entry2->e_value_inum ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003018 memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len))
3019 return 1;
Tahsin Erdogan7cec1912017-06-21 22:14:30 -04003020 if (!entry1->e_value_inum &&
3021 memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs),
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003022 (char *)header2 + le16_to_cpu(entry2->e_value_offs),
3023 le32_to_cpu(entry1->e_value_size)))
3024 return 1;
3025
Mingming Cao617ba132006-10-11 01:20:53 -07003026 entry1 = EXT4_XATTR_NEXT(entry1);
3027 entry2 = EXT4_XATTR_NEXT(entry2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003028 }
3029 if (!IS_LAST_ENTRY(entry2))
3030 return 1;
3031 return 0;
3032}
3033
3034/*
Tahsin Erdogan47387402017-06-22 11:28:55 -04003035 * ext4_xattr_block_cache_find()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003036 *
3037 * Find an identical extended attribute block.
3038 *
3039 * Returns a pointer to the block found, or NULL if such a block was
3040 * not found or an error occurred.
3041 */
3042static struct buffer_head *
Tahsin Erdogan47387402017-06-22 11:28:55 -04003043ext4_xattr_block_cache_find(struct inode *inode,
3044 struct ext4_xattr_header *header,
3045 struct mb_cache_entry **pce)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003046{
3047 __u32 hash = le32_to_cpu(header->h_hash);
Jan Kara7a2508e2016-02-22 22:35:22 -05003048 struct mb_cache_entry *ce;
Tahsin Erdogan47387402017-06-22 11:28:55 -04003049 struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003050
Tahsin Erdogancdb7ee42017-06-22 11:55:14 -04003051 if (!ea_block_cache)
3052 return NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003053 if (!header->h_hash)
3054 return NULL; /* never share */
3055 ea_idebug(inode, "looking for cached blocks [%x]", (int)hash);
Tahsin Erdogan47387402017-06-22 11:28:55 -04003056 ce = mb_cache_entry_find_first(ea_block_cache, hash);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003057 while (ce) {
3058 struct buffer_head *bh;
3059
Theodore Ts'ofb265c9c2018-11-25 17:20:31 -05003060 bh = ext4_sb_bread(inode->i_sb, ce->e_value, REQ_PRIO);
3061 if (IS_ERR(bh)) {
3062 if (PTR_ERR(bh) == -ENOMEM)
3063 return NULL;
Dan Carpenter7159a982019-02-21 11:17:34 -05003064 bh = NULL;
Theodore Ts'o24676da2010-05-16 21:00:00 -04003065 EXT4_ERROR_INODE(inode, "block %lu read error",
Tahsin Erdoganc07dfcb2017-06-22 10:29:53 -04003066 (unsigned long)ce->e_value);
Mingming Cao617ba132006-10-11 01:20:53 -07003067 } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003068 *pce = ce;
3069 return bh;
3070 }
3071 brelse(bh);
Tahsin Erdogan47387402017-06-22 11:28:55 -04003072 ce = mb_cache_entry_find_next(ea_block_cache, ce);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003073 }
3074 return NULL;
3075}
3076
3077#define NAME_HASH_SHIFT 5
3078#define VALUE_HASH_SHIFT 16
3079
3080/*
Mingming Cao617ba132006-10-11 01:20:53 -07003081 * ext4_xattr_hash_entry()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003082 *
3083 * Compute the hash of an extended attribute.
3084 */
Tahsin Erdoganb9fc7612017-06-22 11:53:15 -04003085static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value,
3086 size_t value_count)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003087{
3088 __u32 hash = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003089
Tahsin Erdoganb9fc7612017-06-22 11:53:15 -04003090 while (name_len--) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003091 hash = (hash << NAME_HASH_SHIFT) ^
3092 (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^
3093 *name++;
3094 }
Tahsin Erdoganb9fc7612017-06-22 11:53:15 -04003095 while (value_count--) {
3096 hash = (hash << VALUE_HASH_SHIFT) ^
3097 (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^
3098 le32_to_cpu(*value++);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003099 }
Tahsin Erdoganb9fc7612017-06-22 11:53:15 -04003100 return cpu_to_le32(hash);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003101}
3102
3103#undef NAME_HASH_SHIFT
3104#undef VALUE_HASH_SHIFT
3105
3106#define BLOCK_HASH_SHIFT 16
3107
3108/*
Mingming Cao617ba132006-10-11 01:20:53 -07003109 * ext4_xattr_rehash()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003110 *
3111 * Re-compute the extended attribute hash value after an entry has changed.
3112 */
Tahsin Erdogandaf83282017-06-22 11:52:03 -04003113static void ext4_xattr_rehash(struct ext4_xattr_header *header)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003114{
Mingming Cao617ba132006-10-11 01:20:53 -07003115 struct ext4_xattr_entry *here;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003116 __u32 hash = 0;
3117
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003118 here = ENTRY(header+1);
3119 while (!IS_LAST_ENTRY(here)) {
3120 if (!here->e_hash) {
3121 /* Block is not shared if an entry's hash value == 0 */
3122 hash = 0;
3123 break;
3124 }
3125 hash = (hash << BLOCK_HASH_SHIFT) ^
3126 (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^
3127 le32_to_cpu(here->e_hash);
Mingming Cao617ba132006-10-11 01:20:53 -07003128 here = EXT4_XATTR_NEXT(here);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003129 }
3130 header->h_hash = cpu_to_le32(hash);
3131}
3132
3133#undef BLOCK_HASH_SHIFT
3134
T Makphaibulchoke9c191f72014-03-18 19:24:49 -04003135#define HASH_BUCKET_BITS 10
3136
Jan Kara7a2508e2016-02-22 22:35:22 -05003137struct mb_cache *
Jan Kara82939d72016-02-22 11:50:13 -05003138ext4_xattr_create_cache(void)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003139{
Jan Kara7a2508e2016-02-22 22:35:22 -05003140 return mb_cache_create(HASH_BUCKET_BITS);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003141}
3142
Jan Kara7a2508e2016-02-22 22:35:22 -05003143void ext4_xattr_destroy_cache(struct mb_cache *cache)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003144{
T Makphaibulchoke9c191f72014-03-18 19:24:49 -04003145 if (cache)
Jan Kara7a2508e2016-02-22 22:35:22 -05003146 mb_cache_destroy(cache);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003147}
T Makphaibulchoke9c191f72014-03-18 19:24:49 -04003148