Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2 | * linux/fs/ext4/xattr.c |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> |
| 5 | * |
| 6 | * Fix by Harrison Xing <harrison@mountainviewdata.com>. |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 7 | * Ext4 code with a lot of help from Eric Jarman <ejarman@acm.org>. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 8 | * Extended attributes for symlinks and special files added per |
| 9 | * suggestion of Luka Renko <luka.renko@hermes.si>. |
| 10 | * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>, |
| 11 | * Red Hat Inc. |
| 12 | * ea-in-inode support by Alex Tomas <alex@clusterfs.com> aka bzzz |
| 13 | * and Andreas Gruenbacher <agruen@suse.de>. |
| 14 | */ |
| 15 | |
| 16 | /* |
| 17 | * Extended attributes are stored directly in inodes (on file systems with |
| 18 | * inodes bigger than 128 bytes) and on additional disk blocks. The i_file_acl |
| 19 | * field contains the block number if an inode uses an additional block. All |
| 20 | * attributes must fit in the inode and one additional block. Blocks that |
| 21 | * contain the identical set of attributes may be shared among several inodes. |
| 22 | * Identical blocks are detected by keeping a cache of blocks that have |
| 23 | * recently been accessed. |
| 24 | * |
| 25 | * The attributes in inodes and on blocks have a different header; the entries |
| 26 | * are stored in the same format: |
| 27 | * |
| 28 | * +------------------+ |
| 29 | * | header | |
| 30 | * | entry 1 | | |
| 31 | * | entry 2 | | growing downwards |
| 32 | * | entry 3 | v |
| 33 | * | four null bytes | |
| 34 | * | . . . | |
| 35 | * | value 1 | ^ |
| 36 | * | value 3 | | growing upwards |
| 37 | * | value 2 | | |
| 38 | * +------------------+ |
| 39 | * |
| 40 | * The header is followed by multiple entry descriptors. In disk blocks, the |
| 41 | * entry descriptors are kept sorted. In inodes, they are unsorted. The |
| 42 | * attribute values are aligned to the end of the block in no specific order. |
| 43 | * |
| 44 | * Locking strategy |
| 45 | * ---------------- |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 46 | * EXT4_I(inode)->i_file_acl is protected by EXT4_I(inode)->xattr_sem. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 47 | * EA blocks are only changed if they are exclusive to an inode, so |
| 48 | * holding xattr_sem also means that nothing but the EA block's reference |
| 49 | * count can change. Multiple writers to the same block are synchronized |
| 50 | * by the buffer lock. |
| 51 | */ |
| 52 | |
| 53 | #include <linux/init.h> |
| 54 | #include <linux/fs.h> |
| 55 | #include <linux/slab.h> |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 56 | #include <linux/mbcache.h> |
| 57 | #include <linux/quotaops.h> |
| 58 | #include <linux/rwsem.h> |
Christoph Hellwig | 3dcf545 | 2008-04-29 18:13:32 -0400 | [diff] [blame] | 59 | #include "ext4_jbd2.h" |
| 60 | #include "ext4.h" |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 61 | #include "xattr.h" |
| 62 | #include "acl.h" |
| 63 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 64 | #ifdef EXT4_XATTR_DEBUG |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 65 | # define ea_idebug(inode, f...) do { \ |
| 66 | printk(KERN_DEBUG "inode %s:%lu: ", \ |
| 67 | inode->i_sb->s_id, inode->i_ino); \ |
| 68 | printk(f); \ |
| 69 | printk("\n"); \ |
| 70 | } while (0) |
| 71 | # define ea_bdebug(bh, f...) do { \ |
| 72 | char b[BDEVNAME_SIZE]; \ |
| 73 | printk(KERN_DEBUG "block %s:%lu: ", \ |
| 74 | bdevname(bh->b_bdev, b), \ |
| 75 | (unsigned long) bh->b_blocknr); \ |
| 76 | printk(f); \ |
| 77 | printk("\n"); \ |
| 78 | } while (0) |
| 79 | #else |
Joe Perches | ace36ad | 2012-03-19 23:11:43 -0400 | [diff] [blame] | 80 | # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
| 81 | # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 82 | #endif |
| 83 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 84 | static void ext4_xattr_cache_insert(struct buffer_head *); |
| 85 | static struct buffer_head *ext4_xattr_cache_find(struct inode *, |
| 86 | struct ext4_xattr_header *, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 87 | struct mb_cache_entry **); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 88 | static void ext4_xattr_rehash(struct ext4_xattr_header *, |
| 89 | struct ext4_xattr_entry *); |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 90 | static int ext4_xattr_list(struct dentry *dentry, char *buffer, |
Mingming Cao | d3a95d4 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 91 | size_t buffer_size); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 92 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 93 | static struct mb_cache *ext4_xattr_cache; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 94 | |
Stephen Hemminger | 11e2752 | 2010-05-13 17:53:18 -0700 | [diff] [blame] | 95 | static const struct xattr_handler *ext4_xattr_handler_map[] = { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 96 | [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, |
Theodore Ts'o | 03010a3 | 2008-10-10 20:02:48 -0400 | [diff] [blame] | 97 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 98 | [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &ext4_xattr_acl_access_handler, |
| 99 | [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &ext4_xattr_acl_default_handler, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 100 | #endif |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 101 | [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, |
Theodore Ts'o | 03010a3 | 2008-10-10 20:02:48 -0400 | [diff] [blame] | 102 | #ifdef CONFIG_EXT4_FS_SECURITY |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 103 | [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 104 | #endif |
| 105 | }; |
| 106 | |
Stephen Hemminger | 11e2752 | 2010-05-13 17:53:18 -0700 | [diff] [blame] | 107 | const struct xattr_handler *ext4_xattr_handlers[] = { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 108 | &ext4_xattr_user_handler, |
| 109 | &ext4_xattr_trusted_handler, |
Theodore Ts'o | 03010a3 | 2008-10-10 20:02:48 -0400 | [diff] [blame] | 110 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 111 | &ext4_xattr_acl_access_handler, |
| 112 | &ext4_xattr_acl_default_handler, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 113 | #endif |
Theodore Ts'o | 03010a3 | 2008-10-10 20:02:48 -0400 | [diff] [blame] | 114 | #ifdef CONFIG_EXT4_FS_SECURITY |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 115 | &ext4_xattr_security_handler, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 116 | #endif |
| 117 | NULL |
| 118 | }; |
| 119 | |
Darrick J. Wong | cc8e94f | 2012-04-29 18:43:10 -0400 | [diff] [blame] | 120 | static __le32 ext4_xattr_block_csum(struct inode *inode, |
| 121 | sector_t block_nr, |
| 122 | struct ext4_xattr_header *hdr) |
| 123 | { |
| 124 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
Darrick J. Wong | cc8e94f | 2012-04-29 18:43:10 -0400 | [diff] [blame] | 125 | __u32 csum, old; |
| 126 | |
| 127 | old = hdr->h_checksum; |
| 128 | hdr->h_checksum = 0; |
Tao Ma | 41eb70d | 2012-07-09 16:29:27 -0400 | [diff] [blame] | 129 | block_nr = cpu_to_le64(block_nr); |
| 130 | csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&block_nr, |
| 131 | sizeof(block_nr)); |
Darrick J. Wong | cc8e94f | 2012-04-29 18:43:10 -0400 | [diff] [blame] | 132 | csum = ext4_chksum(sbi, csum, (__u8 *)hdr, |
| 133 | EXT4_BLOCK_SIZE(inode->i_sb)); |
Tao Ma | 41eb70d | 2012-07-09 16:29:27 -0400 | [diff] [blame] | 134 | |
Darrick J. Wong | cc8e94f | 2012-04-29 18:43:10 -0400 | [diff] [blame] | 135 | hdr->h_checksum = old; |
| 136 | return cpu_to_le32(csum); |
| 137 | } |
| 138 | |
| 139 | static int ext4_xattr_block_csum_verify(struct inode *inode, |
| 140 | sector_t block_nr, |
| 141 | struct ext4_xattr_header *hdr) |
| 142 | { |
| 143 | if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, |
| 144 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && |
| 145 | (hdr->h_checksum != ext4_xattr_block_csum(inode, block_nr, hdr))) |
| 146 | return 0; |
| 147 | return 1; |
| 148 | } |
| 149 | |
| 150 | static void ext4_xattr_block_csum_set(struct inode *inode, |
| 151 | sector_t block_nr, |
| 152 | struct ext4_xattr_header *hdr) |
| 153 | { |
| 154 | if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, |
| 155 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) |
| 156 | return; |
| 157 | |
| 158 | hdr->h_checksum = ext4_xattr_block_csum(inode, block_nr, hdr); |
| 159 | } |
| 160 | |
| 161 | static inline int ext4_handle_dirty_xattr_block(handle_t *handle, |
| 162 | struct inode *inode, |
| 163 | struct buffer_head *bh) |
| 164 | { |
| 165 | ext4_xattr_block_csum_set(inode, bh->b_blocknr, BHDR(bh)); |
| 166 | return ext4_handle_dirty_metadata(handle, inode, bh); |
| 167 | } |
| 168 | |
Stephen Hemminger | 11e2752 | 2010-05-13 17:53:18 -0700 | [diff] [blame] | 169 | static inline const struct xattr_handler * |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 170 | ext4_xattr_handler(int name_index) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 171 | { |
Stephen Hemminger | 11e2752 | 2010-05-13 17:53:18 -0700 | [diff] [blame] | 172 | const struct xattr_handler *handler = NULL; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 173 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 174 | if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) |
| 175 | handler = ext4_xattr_handler_map[name_index]; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 176 | return handler; |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * Inode operation listxattr() |
| 181 | * |
| 182 | * dentry->d_inode->i_mutex: don't care |
| 183 | */ |
| 184 | ssize_t |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 185 | ext4_listxattr(struct dentry *dentry, char *buffer, size_t size) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 186 | { |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 187 | return ext4_xattr_list(dentry, buffer, size); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 188 | } |
| 189 | |
| 190 | static int |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 191 | ext4_xattr_check_names(struct ext4_xattr_entry *entry, void *end) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 192 | { |
| 193 | while (!IS_LAST_ENTRY(entry)) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 194 | struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(entry); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 195 | if ((void *)next >= end) |
| 196 | return -EIO; |
| 197 | entry = next; |
| 198 | } |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | static inline int |
Darrick J. Wong | cc8e94f | 2012-04-29 18:43:10 -0400 | [diff] [blame] | 203 | ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 204 | { |
Darrick J. Wong | cc8e94f | 2012-04-29 18:43:10 -0400 | [diff] [blame] | 205 | int error; |
| 206 | |
| 207 | if (buffer_verified(bh)) |
| 208 | return 0; |
| 209 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 210 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 211 | BHDR(bh)->h_blocks != cpu_to_le32(1)) |
| 212 | return -EIO; |
Darrick J. Wong | cc8e94f | 2012-04-29 18:43:10 -0400 | [diff] [blame] | 213 | if (!ext4_xattr_block_csum_verify(inode, bh->b_blocknr, BHDR(bh))) |
| 214 | return -EIO; |
| 215 | error = ext4_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size); |
| 216 | if (!error) |
| 217 | set_buffer_verified(bh); |
| 218 | return error; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 219 | } |
| 220 | |
| 221 | static inline int |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 222 | ext4_xattr_check_entry(struct ext4_xattr_entry *entry, size_t size) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 223 | { |
| 224 | size_t value_size = le32_to_cpu(entry->e_value_size); |
| 225 | |
| 226 | if (entry->e_value_block != 0 || value_size > size || |
| 227 | le16_to_cpu(entry->e_value_offs) + value_size > size) |
| 228 | return -EIO; |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | static int |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 233 | ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 234 | const char *name, size_t size, int sorted) |
| 235 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 236 | struct ext4_xattr_entry *entry; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 237 | size_t name_len; |
| 238 | int cmp = 1; |
| 239 | |
| 240 | if (name == NULL) |
| 241 | return -EINVAL; |
| 242 | name_len = strlen(name); |
| 243 | entry = *pentry; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 244 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 245 | cmp = name_index - entry->e_name_index; |
| 246 | if (!cmp) |
| 247 | cmp = name_len - entry->e_name_len; |
| 248 | if (!cmp) |
| 249 | cmp = memcmp(name, entry->e_name, name_len); |
| 250 | if (cmp <= 0 && (sorted || cmp == 0)) |
| 251 | break; |
| 252 | } |
| 253 | *pentry = entry; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 254 | if (!cmp && ext4_xattr_check_entry(entry, size)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 255 | return -EIO; |
| 256 | return cmp ? -ENODATA : 0; |
| 257 | } |
| 258 | |
| 259 | static int |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 260 | ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 261 | void *buffer, size_t buffer_size) |
| 262 | { |
| 263 | struct buffer_head *bh = NULL; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 264 | struct ext4_xattr_entry *entry; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 265 | size_t size; |
| 266 | int error; |
| 267 | |
| 268 | ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", |
| 269 | name_index, name, buffer, (long)buffer_size); |
| 270 | |
| 271 | error = -ENODATA; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 272 | if (!EXT4_I(inode)->i_file_acl) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 273 | goto cleanup; |
Joe Perches | ace36ad | 2012-03-19 23:11:43 -0400 | [diff] [blame] | 274 | ea_idebug(inode, "reading block %llu", |
| 275 | (unsigned long long)EXT4_I(inode)->i_file_acl); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 276 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 277 | if (!bh) |
| 278 | goto cleanup; |
| 279 | ea_bdebug(bh, "b_count=%d, refcount=%d", |
| 280 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); |
Darrick J. Wong | cc8e94f | 2012-04-29 18:43:10 -0400 | [diff] [blame] | 281 | if (ext4_xattr_check_block(inode, bh)) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 282 | bad_block: |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 283 | EXT4_ERROR_INODE(inode, "bad block %llu", |
| 284 | EXT4_I(inode)->i_file_acl); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 285 | error = -EIO; |
| 286 | goto cleanup; |
| 287 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 288 | ext4_xattr_cache_insert(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 289 | entry = BFIRST(bh); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 290 | error = ext4_xattr_find_entry(&entry, name_index, name, bh->b_size, 1); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 291 | if (error == -EIO) |
| 292 | goto bad_block; |
| 293 | if (error) |
| 294 | goto cleanup; |
| 295 | size = le32_to_cpu(entry->e_value_size); |
| 296 | if (buffer) { |
| 297 | error = -ERANGE; |
| 298 | if (size > buffer_size) |
| 299 | goto cleanup; |
| 300 | memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs), |
| 301 | size); |
| 302 | } |
| 303 | error = size; |
| 304 | |
| 305 | cleanup: |
| 306 | brelse(bh); |
| 307 | return error; |
| 308 | } |
| 309 | |
Tao Ma | 879b382 | 2012-12-05 10:28:46 -0500 | [diff] [blame] | 310 | int |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 311 | ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 312 | void *buffer, size_t buffer_size) |
| 313 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 314 | struct ext4_xattr_ibody_header *header; |
| 315 | struct ext4_xattr_entry *entry; |
| 316 | struct ext4_inode *raw_inode; |
| 317 | struct ext4_iloc iloc; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 318 | size_t size; |
| 319 | void *end; |
| 320 | int error; |
| 321 | |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 322 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 323 | return -ENODATA; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 324 | error = ext4_get_inode_loc(inode, &iloc); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 325 | if (error) |
| 326 | return error; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 327 | raw_inode = ext4_raw_inode(&iloc); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 328 | header = IHDR(inode, raw_inode); |
| 329 | entry = IFIRST(header); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 330 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
| 331 | error = ext4_xattr_check_names(entry, end); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 332 | if (error) |
| 333 | goto cleanup; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 334 | error = ext4_xattr_find_entry(&entry, name_index, name, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 335 | end - (void *)entry, 0); |
| 336 | if (error) |
| 337 | goto cleanup; |
| 338 | size = le32_to_cpu(entry->e_value_size); |
| 339 | if (buffer) { |
| 340 | error = -ERANGE; |
| 341 | if (size > buffer_size) |
| 342 | goto cleanup; |
| 343 | memcpy(buffer, (void *)IFIRST(header) + |
| 344 | le16_to_cpu(entry->e_value_offs), size); |
| 345 | } |
| 346 | error = size; |
| 347 | |
| 348 | cleanup: |
| 349 | brelse(iloc.bh); |
| 350 | return error; |
| 351 | } |
| 352 | |
| 353 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 354 | * ext4_xattr_get() |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 355 | * |
| 356 | * Copy an extended attribute into the buffer |
| 357 | * provided, or compute the buffer size required. |
| 358 | * Buffer is NULL to compute the size of the buffer required. |
| 359 | * |
| 360 | * Returns a negative error number on failure, or the number of bytes |
| 361 | * used / required on success. |
| 362 | */ |
| 363 | int |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 364 | ext4_xattr_get(struct inode *inode, int name_index, const char *name, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 365 | void *buffer, size_t buffer_size) |
| 366 | { |
| 367 | int error; |
| 368 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 369 | down_read(&EXT4_I(inode)->xattr_sem); |
| 370 | error = ext4_xattr_ibody_get(inode, name_index, name, buffer, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 371 | buffer_size); |
| 372 | if (error == -ENODATA) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 373 | error = ext4_xattr_block_get(inode, name_index, name, buffer, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 374 | buffer_size); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 375 | up_read(&EXT4_I(inode)->xattr_sem); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 376 | return error; |
| 377 | } |
| 378 | |
| 379 | static int |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 380 | ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 381 | char *buffer, size_t buffer_size) |
| 382 | { |
| 383 | size_t rest = buffer_size; |
| 384 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 385 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
Stephen Hemminger | 11e2752 | 2010-05-13 17:53:18 -0700 | [diff] [blame] | 386 | const struct xattr_handler *handler = |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 387 | ext4_xattr_handler(entry->e_name_index); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 388 | |
| 389 | if (handler) { |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 390 | size_t size = handler->list(dentry, buffer, rest, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 391 | entry->e_name, |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 392 | entry->e_name_len, |
| 393 | handler->flags); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 394 | if (buffer) { |
| 395 | if (size > rest) |
| 396 | return -ERANGE; |
| 397 | buffer += size; |
| 398 | } |
| 399 | rest -= size; |
| 400 | } |
| 401 | } |
| 402 | return buffer_size - rest; |
| 403 | } |
| 404 | |
| 405 | static int |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 406 | ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 407 | { |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 408 | struct inode *inode = dentry->d_inode; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 409 | struct buffer_head *bh = NULL; |
| 410 | int error; |
| 411 | |
| 412 | ea_idebug(inode, "buffer=%p, buffer_size=%ld", |
| 413 | buffer, (long)buffer_size); |
| 414 | |
| 415 | error = 0; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 416 | if (!EXT4_I(inode)->i_file_acl) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 417 | goto cleanup; |
Joe Perches | ace36ad | 2012-03-19 23:11:43 -0400 | [diff] [blame] | 418 | ea_idebug(inode, "reading block %llu", |
| 419 | (unsigned long long)EXT4_I(inode)->i_file_acl); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 420 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 421 | error = -EIO; |
| 422 | if (!bh) |
| 423 | goto cleanup; |
| 424 | ea_bdebug(bh, "b_count=%d, refcount=%d", |
| 425 | atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); |
Darrick J. Wong | cc8e94f | 2012-04-29 18:43:10 -0400 | [diff] [blame] | 426 | if (ext4_xattr_check_block(inode, bh)) { |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 427 | EXT4_ERROR_INODE(inode, "bad block %llu", |
| 428 | EXT4_I(inode)->i_file_acl); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 429 | error = -EIO; |
| 430 | goto cleanup; |
| 431 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 432 | ext4_xattr_cache_insert(bh); |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 433 | error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 434 | |
| 435 | cleanup: |
| 436 | brelse(bh); |
| 437 | |
| 438 | return error; |
| 439 | } |
| 440 | |
| 441 | static int |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 442 | ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 443 | { |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 444 | struct inode *inode = dentry->d_inode; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 445 | struct ext4_xattr_ibody_header *header; |
| 446 | struct ext4_inode *raw_inode; |
| 447 | struct ext4_iloc iloc; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 448 | void *end; |
| 449 | int error; |
| 450 | |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 451 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 452 | return 0; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 453 | error = ext4_get_inode_loc(inode, &iloc); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 454 | if (error) |
| 455 | return error; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 456 | raw_inode = ext4_raw_inode(&iloc); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 457 | header = IHDR(inode, raw_inode); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 458 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
| 459 | error = ext4_xattr_check_names(IFIRST(header), end); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 460 | if (error) |
| 461 | goto cleanup; |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 462 | error = ext4_xattr_list_entries(dentry, IFIRST(header), |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 463 | buffer, buffer_size); |
| 464 | |
| 465 | cleanup: |
| 466 | brelse(iloc.bh); |
| 467 | return error; |
| 468 | } |
| 469 | |
| 470 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 471 | * ext4_xattr_list() |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 472 | * |
| 473 | * Copy a list of attribute names into the buffer |
| 474 | * provided, or compute the buffer size required. |
| 475 | * Buffer is NULL to compute the size of the buffer required. |
| 476 | * |
| 477 | * Returns a negative error number on failure, or the number of bytes |
| 478 | * used / required on success. |
| 479 | */ |
Mingming Cao | d3a95d4 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 480 | static int |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 481 | ext4_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 482 | { |
Theodore Ts'o | eaeef86 | 2011-01-10 12:10:07 -0500 | [diff] [blame] | 483 | int ret, ret2; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 484 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 485 | down_read(&EXT4_I(dentry->d_inode)->xattr_sem); |
Theodore Ts'o | eaeef86 | 2011-01-10 12:10:07 -0500 | [diff] [blame] | 486 | ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); |
| 487 | if (ret < 0) |
| 488 | goto errout; |
| 489 | if (buffer) { |
| 490 | buffer += ret; |
| 491 | buffer_size -= ret; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 492 | } |
Theodore Ts'o | eaeef86 | 2011-01-10 12:10:07 -0500 | [diff] [blame] | 493 | ret = ext4_xattr_block_list(dentry, buffer, buffer_size); |
| 494 | if (ret < 0) |
| 495 | goto errout; |
| 496 | ret += ret2; |
| 497 | errout: |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 498 | up_read(&EXT4_I(dentry->d_inode)->xattr_sem); |
Theodore Ts'o | eaeef86 | 2011-01-10 12:10:07 -0500 | [diff] [blame] | 499 | return ret; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 500 | } |
| 501 | |
| 502 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 503 | * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 504 | * not set, set it. |
| 505 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 506 | static void ext4_xattr_update_super_block(handle_t *handle, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 507 | struct super_block *sb) |
| 508 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 509 | if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_EXT_ATTR)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 510 | return; |
| 511 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 512 | if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { |
Andreas Gruenbacher | ed2908f | 2006-12-06 20:36:16 -0800 | [diff] [blame] | 513 | EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_EXT_ATTR); |
Theodore Ts'o | a037515 | 2010-06-11 23:14:04 -0400 | [diff] [blame] | 514 | ext4_handle_dirty_super(handle, sb); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 515 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 516 | } |
| 517 | |
| 518 | /* |
| 519 | * Release the xattr block BH: If the reference count is > 1, decrement |
| 520 | * it; otherwise free the block. |
| 521 | */ |
| 522 | static void |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 523 | ext4_xattr_release_block(handle_t *handle, struct inode *inode, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 524 | struct buffer_head *bh) |
| 525 | { |
| 526 | struct mb_cache_entry *ce = NULL; |
Mingming Cao | 8a2bfdc | 2007-02-28 20:13:35 -0800 | [diff] [blame] | 527 | int error = 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 528 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 529 | ce = mb_cache_entry_get(ext4_xattr_cache, bh->b_bdev, bh->b_blocknr); |
Mingming Cao | 8a2bfdc | 2007-02-28 20:13:35 -0800 | [diff] [blame] | 530 | error = ext4_journal_get_write_access(handle, bh); |
| 531 | if (error) |
| 532 | goto out; |
| 533 | |
| 534 | lock_buffer(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 535 | if (BHDR(bh)->h_refcount == cpu_to_le32(1)) { |
| 536 | ea_bdebug(bh, "refcount now=0; freeing"); |
| 537 | if (ce) |
| 538 | mb_cache_entry_free(ce); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 539 | get_bh(bh); |
Theodore Ts'o | e636260 | 2009-11-23 07:17:05 -0500 | [diff] [blame] | 540 | ext4_free_blocks(handle, inode, bh, 0, 1, |
| 541 | EXT4_FREE_BLOCKS_METADATA | |
| 542 | EXT4_FREE_BLOCKS_FORGET); |
Eric Sandeen | c1bb05a | 2012-02-20 23:06:18 -0500 | [diff] [blame] | 543 | unlock_buffer(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 544 | } else { |
Marcin Slusarz | e8546d0 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 545 | le32_add_cpu(&BHDR(bh)->h_refcount, -1); |
Eric Sandeen | c1bb05a | 2012-02-20 23:06:18 -0500 | [diff] [blame] | 546 | if (ce) |
| 547 | mb_cache_entry_release(ce); |
| 548 | unlock_buffer(bh); |
Darrick J. Wong | cc8e94f | 2012-04-29 18:43:10 -0400 | [diff] [blame] | 549 | error = ext4_handle_dirty_xattr_block(handle, inode, bh); |
Mingming Cao | 8a2bfdc | 2007-02-28 20:13:35 -0800 | [diff] [blame] | 550 | if (IS_SYNC(inode)) |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 551 | ext4_handle_sync(handle); |
Christoph Hellwig | 5dd4056 | 2010-03-03 09:05:00 -0500 | [diff] [blame] | 552 | dquot_free_block(inode, 1); |
Mingming Cao | 8a2bfdc | 2007-02-28 20:13:35 -0800 | [diff] [blame] | 553 | ea_bdebug(bh, "refcount now=%d; releasing", |
| 554 | le32_to_cpu(BHDR(bh)->h_refcount)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 555 | } |
Mingming Cao | 8a2bfdc | 2007-02-28 20:13:35 -0800 | [diff] [blame] | 556 | out: |
| 557 | ext4_std_error(inode->i_sb, error); |
| 558 | return; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 559 | } |
| 560 | |
Kalpak Shah | 6dd4ee7 | 2007-07-18 09:19:57 -0400 | [diff] [blame] | 561 | /* |
| 562 | * Find the available free space for EAs. This also returns the total number of |
| 563 | * bytes used by EA entries. |
| 564 | */ |
| 565 | static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, |
| 566 | size_t *min_offs, void *base, int *total) |
| 567 | { |
| 568 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { |
| 569 | *total += EXT4_XATTR_LEN(last->e_name_len); |
| 570 | if (!last->e_value_block && last->e_value_size) { |
| 571 | size_t offs = le16_to_cpu(last->e_value_offs); |
| 572 | if (offs < *min_offs) |
| 573 | *min_offs = offs; |
| 574 | } |
| 575 | } |
| 576 | return (*min_offs - ((void *)last - base) - sizeof(__u32)); |
| 577 | } |
| 578 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 579 | static int |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 580 | ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 581 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 582 | struct ext4_xattr_entry *last; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 583 | size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); |
| 584 | |
| 585 | /* Compute min_offs and last. */ |
| 586 | last = s->first; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 587 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 588 | if (!last->e_value_block && last->e_value_size) { |
| 589 | size_t offs = le16_to_cpu(last->e_value_offs); |
| 590 | if (offs < min_offs) |
| 591 | min_offs = offs; |
| 592 | } |
| 593 | } |
| 594 | free = min_offs - ((void *)last - s->base) - sizeof(__u32); |
| 595 | if (!s->not_found) { |
| 596 | if (!s->here->e_value_block && s->here->e_value_size) { |
| 597 | size_t size = le32_to_cpu(s->here->e_value_size); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 598 | free += EXT4_XATTR_SIZE(size); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 599 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 600 | free += EXT4_XATTR_LEN(name_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 601 | } |
| 602 | if (i->value) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 603 | if (free < EXT4_XATTR_SIZE(i->value_len) || |
| 604 | free < EXT4_XATTR_LEN(name_len) + |
| 605 | EXT4_XATTR_SIZE(i->value_len)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 606 | return -ENOSPC; |
| 607 | } |
| 608 | |
| 609 | if (i->value && s->not_found) { |
| 610 | /* Insert the new name. */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 611 | size_t size = EXT4_XATTR_LEN(name_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 612 | size_t rest = (void *)last - (void *)s->here + sizeof(__u32); |
| 613 | memmove((void *)s->here + size, s->here, rest); |
| 614 | memset(s->here, 0, size); |
| 615 | s->here->e_name_index = i->name_index; |
| 616 | s->here->e_name_len = name_len; |
| 617 | memcpy(s->here->e_name, i->name, name_len); |
| 618 | } else { |
| 619 | if (!s->here->e_value_block && s->here->e_value_size) { |
| 620 | void *first_val = s->base + min_offs; |
| 621 | size_t offs = le16_to_cpu(s->here->e_value_offs); |
| 622 | void *val = s->base + offs; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 623 | size_t size = EXT4_XATTR_SIZE( |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 624 | le32_to_cpu(s->here->e_value_size)); |
| 625 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 626 | if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 627 | /* The old and the new value have the same |
| 628 | size. Just replace. */ |
| 629 | s->here->e_value_size = |
| 630 | cpu_to_le32(i->value_len); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 631 | memset(val + size - EXT4_XATTR_PAD, 0, |
| 632 | EXT4_XATTR_PAD); /* Clear pad bytes. */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 633 | memcpy(val, i->value, i->value_len); |
| 634 | return 0; |
| 635 | } |
| 636 | |
| 637 | /* Remove the old value. */ |
| 638 | memmove(first_val + size, first_val, val - first_val); |
| 639 | memset(first_val, 0, size); |
| 640 | s->here->e_value_size = 0; |
| 641 | s->here->e_value_offs = 0; |
| 642 | min_offs += size; |
| 643 | |
| 644 | /* Adjust all value offsets. */ |
| 645 | last = s->first; |
| 646 | while (!IS_LAST_ENTRY(last)) { |
| 647 | size_t o = le16_to_cpu(last->e_value_offs); |
| 648 | if (!last->e_value_block && |
| 649 | last->e_value_size && o < offs) |
| 650 | last->e_value_offs = |
| 651 | cpu_to_le16(o + size); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 652 | last = EXT4_XATTR_NEXT(last); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 653 | } |
| 654 | } |
| 655 | if (!i->value) { |
| 656 | /* Remove the old name. */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 657 | size_t size = EXT4_XATTR_LEN(name_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 658 | last = ENTRY((void *)last - size); |
| 659 | memmove(s->here, (void *)s->here + size, |
| 660 | (void *)last - (void *)s->here + sizeof(__u32)); |
| 661 | memset(last, 0, size); |
| 662 | } |
| 663 | } |
| 664 | |
| 665 | if (i->value) { |
| 666 | /* Insert the new value. */ |
| 667 | s->here->e_value_size = cpu_to_le32(i->value_len); |
| 668 | if (i->value_len) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 669 | size_t size = EXT4_XATTR_SIZE(i->value_len); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 670 | void *val = s->base + min_offs - size; |
| 671 | s->here->e_value_offs = cpu_to_le16(min_offs - size); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 672 | memset(val + size - EXT4_XATTR_PAD, 0, |
| 673 | EXT4_XATTR_PAD); /* Clear the pad bytes. */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 674 | memcpy(val, i->value, i->value_len); |
| 675 | } |
| 676 | } |
| 677 | return 0; |
| 678 | } |
| 679 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 680 | struct ext4_xattr_block_find { |
| 681 | struct ext4_xattr_search s; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 682 | struct buffer_head *bh; |
| 683 | }; |
| 684 | |
| 685 | static int |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 686 | ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, |
| 687 | struct ext4_xattr_block_find *bs) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 688 | { |
| 689 | struct super_block *sb = inode->i_sb; |
| 690 | int error; |
| 691 | |
| 692 | ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", |
| 693 | i->name_index, i->name, i->value, (long)i->value_len); |
| 694 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 695 | if (EXT4_I(inode)->i_file_acl) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 696 | /* The inode already has an extended attribute block. */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 697 | bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 698 | error = -EIO; |
| 699 | if (!bs->bh) |
| 700 | goto cleanup; |
| 701 | ea_bdebug(bs->bh, "b_count=%d, refcount=%d", |
| 702 | atomic_read(&(bs->bh->b_count)), |
| 703 | le32_to_cpu(BHDR(bs->bh)->h_refcount)); |
Darrick J. Wong | cc8e94f | 2012-04-29 18:43:10 -0400 | [diff] [blame] | 704 | if (ext4_xattr_check_block(inode, bs->bh)) { |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 705 | EXT4_ERROR_INODE(inode, "bad block %llu", |
| 706 | EXT4_I(inode)->i_file_acl); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 707 | error = -EIO; |
| 708 | goto cleanup; |
| 709 | } |
| 710 | /* Find the named attribute. */ |
| 711 | bs->s.base = BHDR(bs->bh); |
| 712 | bs->s.first = BFIRST(bs->bh); |
| 713 | bs->s.end = bs->bh->b_data + bs->bh->b_size; |
| 714 | bs->s.here = bs->s.first; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 715 | error = ext4_xattr_find_entry(&bs->s.here, i->name_index, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 716 | i->name, bs->bh->b_size, 1); |
| 717 | if (error && error != -ENODATA) |
| 718 | goto cleanup; |
| 719 | bs->s.not_found = error; |
| 720 | } |
| 721 | error = 0; |
| 722 | |
| 723 | cleanup: |
| 724 | return error; |
| 725 | } |
| 726 | |
| 727 | static int |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 728 | ext4_xattr_block_set(handle_t *handle, struct inode *inode, |
| 729 | struct ext4_xattr_info *i, |
| 730 | struct ext4_xattr_block_find *bs) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 731 | { |
| 732 | struct super_block *sb = inode->i_sb; |
| 733 | struct buffer_head *new_bh = NULL; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 734 | struct ext4_xattr_search *s = &bs->s; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 735 | struct mb_cache_entry *ce = NULL; |
Mingming Cao | 8a2bfdc | 2007-02-28 20:13:35 -0800 | [diff] [blame] | 736 | int error = 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 737 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 738 | #define header(x) ((struct ext4_xattr_header *)(x)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 739 | |
| 740 | if (i->value && i->value_len > sb->s_blocksize) |
| 741 | return -ENOSPC; |
| 742 | if (s->base) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 743 | ce = mb_cache_entry_get(ext4_xattr_cache, bs->bh->b_bdev, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 744 | bs->bh->b_blocknr); |
Mingming Cao | 8a2bfdc | 2007-02-28 20:13:35 -0800 | [diff] [blame] | 745 | error = ext4_journal_get_write_access(handle, bs->bh); |
| 746 | if (error) |
| 747 | goto cleanup; |
| 748 | lock_buffer(bs->bh); |
| 749 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 750 | if (header(s->base)->h_refcount == cpu_to_le32(1)) { |
| 751 | if (ce) { |
| 752 | mb_cache_entry_free(ce); |
| 753 | ce = NULL; |
| 754 | } |
| 755 | ea_bdebug(bs->bh, "modifying in-place"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 756 | error = ext4_xattr_set_entry(i, s); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 757 | if (!error) { |
| 758 | if (!IS_LAST_ENTRY(s->first)) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 759 | ext4_xattr_rehash(header(s->base), |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 760 | s->here); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 761 | ext4_xattr_cache_insert(bs->bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 762 | } |
| 763 | unlock_buffer(bs->bh); |
| 764 | if (error == -EIO) |
| 765 | goto bad_block; |
| 766 | if (!error) |
Darrick J. Wong | cc8e94f | 2012-04-29 18:43:10 -0400 | [diff] [blame] | 767 | error = ext4_handle_dirty_xattr_block(handle, |
| 768 | inode, |
| 769 | bs->bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 770 | if (error) |
| 771 | goto cleanup; |
| 772 | goto inserted; |
| 773 | } else { |
| 774 | int offset = (char *)s->here - bs->bh->b_data; |
| 775 | |
Mingming Cao | 8a2bfdc | 2007-02-28 20:13:35 -0800 | [diff] [blame] | 776 | unlock_buffer(bs->bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 777 | if (ce) { |
| 778 | mb_cache_entry_release(ce); |
| 779 | ce = NULL; |
| 780 | } |
| 781 | ea_bdebug(bs->bh, "cloning"); |
Josef Bacik | 216553c | 2008-04-29 22:02:02 -0400 | [diff] [blame] | 782 | s->base = kmalloc(bs->bh->b_size, GFP_NOFS); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 783 | error = -ENOMEM; |
| 784 | if (s->base == NULL) |
| 785 | goto cleanup; |
| 786 | memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); |
| 787 | s->first = ENTRY(header(s->base)+1); |
| 788 | header(s->base)->h_refcount = cpu_to_le32(1); |
| 789 | s->here = ENTRY(s->base + offset); |
| 790 | s->end = s->base + bs->bh->b_size; |
| 791 | } |
| 792 | } else { |
| 793 | /* Allocate a buffer where we construct the new block. */ |
Josef Bacik | 216553c | 2008-04-29 22:02:02 -0400 | [diff] [blame] | 794 | s->base = kzalloc(sb->s_blocksize, GFP_NOFS); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 795 | /* assert(header == s->base) */ |
| 796 | error = -ENOMEM; |
| 797 | if (s->base == NULL) |
| 798 | goto cleanup; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 799 | header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 800 | header(s->base)->h_blocks = cpu_to_le32(1); |
| 801 | header(s->base)->h_refcount = cpu_to_le32(1); |
| 802 | s->first = ENTRY(header(s->base)+1); |
| 803 | s->here = ENTRY(header(s->base)+1); |
| 804 | s->end = s->base + sb->s_blocksize; |
| 805 | } |
| 806 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 807 | error = ext4_xattr_set_entry(i, s); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 808 | if (error == -EIO) |
| 809 | goto bad_block; |
| 810 | if (error) |
| 811 | goto cleanup; |
| 812 | if (!IS_LAST_ENTRY(s->first)) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 813 | ext4_xattr_rehash(header(s->base), s->here); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 814 | |
| 815 | inserted: |
| 816 | if (!IS_LAST_ENTRY(s->first)) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 817 | new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 818 | if (new_bh) { |
| 819 | /* We found an identical block in the cache. */ |
| 820 | if (new_bh == bs->bh) |
| 821 | ea_bdebug(new_bh, "keeping"); |
| 822 | else { |
| 823 | /* The old block is released after updating |
| 824 | the inode. */ |
Christoph Hellwig | 5dd4056 | 2010-03-03 09:05:00 -0500 | [diff] [blame] | 825 | error = dquot_alloc_block(inode, 1); |
| 826 | if (error) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 827 | goto cleanup; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 828 | error = ext4_journal_get_write_access(handle, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 829 | new_bh); |
| 830 | if (error) |
| 831 | goto cleanup_dquot; |
| 832 | lock_buffer(new_bh); |
Marcin Slusarz | e8546d0 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 833 | le32_add_cpu(&BHDR(new_bh)->h_refcount, 1); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 834 | ea_bdebug(new_bh, "reusing; refcount now=%d", |
| 835 | le32_to_cpu(BHDR(new_bh)->h_refcount)); |
| 836 | unlock_buffer(new_bh); |
Darrick J. Wong | cc8e94f | 2012-04-29 18:43:10 -0400 | [diff] [blame] | 837 | error = ext4_handle_dirty_xattr_block(handle, |
| 838 | inode, |
| 839 | new_bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 840 | if (error) |
| 841 | goto cleanup_dquot; |
| 842 | } |
| 843 | mb_cache_entry_release(ce); |
| 844 | ce = NULL; |
| 845 | } else if (bs->bh && s->base == bs->bh->b_data) { |
| 846 | /* We were modifying this block in-place. */ |
| 847 | ea_bdebug(bs->bh, "keeping this block"); |
| 848 | new_bh = bs->bh; |
| 849 | get_bh(new_bh); |
| 850 | } else { |
| 851 | /* We need to allocate a new block */ |
Eric Sandeen | fb0a387 | 2009-09-16 14:45:10 -0400 | [diff] [blame] | 852 | ext4_fsblk_t goal, block; |
| 853 | |
| 854 | goal = ext4_group_first_block_no(sb, |
Akinobu Mita | d00a6d7 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 855 | EXT4_I(inode)->i_block_group); |
Eric Sandeen | fb0a387 | 2009-09-16 14:45:10 -0400 | [diff] [blame] | 856 | |
| 857 | /* non-extent files can't have physical blocks past 2^32 */ |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 858 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
Eric Sandeen | fb0a387 | 2009-09-16 14:45:10 -0400 | [diff] [blame] | 859 | goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; |
| 860 | |
Eric Sandeen | 6d6a4351 | 2011-10-29 10:15:35 -0400 | [diff] [blame] | 861 | /* |
| 862 | * take i_data_sem because we will test |
| 863 | * i_delalloc_reserved_flag in ext4_mb_new_blocks |
| 864 | */ |
| 865 | down_read((&EXT4_I(inode)->i_data_sem)); |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 866 | block = ext4_new_meta_blocks(handle, inode, goal, 0, |
| 867 | NULL, &error); |
Eric Sandeen | 6d6a4351 | 2011-10-29 10:15:35 -0400 | [diff] [blame] | 868 | up_read((&EXT4_I(inode)->i_data_sem)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 869 | if (error) |
| 870 | goto cleanup; |
Eric Sandeen | fb0a387 | 2009-09-16 14:45:10 -0400 | [diff] [blame] | 871 | |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 872 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
Eric Sandeen | fb0a387 | 2009-09-16 14:45:10 -0400 | [diff] [blame] | 873 | BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); |
| 874 | |
Joe Perches | ace36ad | 2012-03-19 23:11:43 -0400 | [diff] [blame] | 875 | ea_idebug(inode, "creating block %llu", |
| 876 | (unsigned long long)block); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 877 | |
| 878 | new_bh = sb_getblk(sb, block); |
| 879 | if (!new_bh) { |
| 880 | getblk_failed: |
Peter Huewe | 7dc5761 | 2011-02-21 21:01:42 -0500 | [diff] [blame] | 881 | ext4_free_blocks(handle, inode, NULL, block, 1, |
Theodore Ts'o | e636260 | 2009-11-23 07:17:05 -0500 | [diff] [blame] | 882 | EXT4_FREE_BLOCKS_METADATA); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 883 | error = -EIO; |
| 884 | goto cleanup; |
| 885 | } |
| 886 | lock_buffer(new_bh); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 887 | error = ext4_journal_get_create_access(handle, new_bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 888 | if (error) { |
| 889 | unlock_buffer(new_bh); |
| 890 | goto getblk_failed; |
| 891 | } |
| 892 | memcpy(new_bh->b_data, s->base, new_bh->b_size); |
| 893 | set_buffer_uptodate(new_bh); |
| 894 | unlock_buffer(new_bh); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 895 | ext4_xattr_cache_insert(new_bh); |
Darrick J. Wong | cc8e94f | 2012-04-29 18:43:10 -0400 | [diff] [blame] | 896 | error = ext4_handle_dirty_xattr_block(handle, |
| 897 | inode, new_bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 898 | if (error) |
| 899 | goto cleanup; |
| 900 | } |
| 901 | } |
| 902 | |
| 903 | /* Update the inode. */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 904 | EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 905 | |
| 906 | /* Drop the previous xattr block. */ |
| 907 | if (bs->bh && bs->bh != new_bh) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 908 | ext4_xattr_release_block(handle, inode, bs->bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 909 | error = 0; |
| 910 | |
| 911 | cleanup: |
| 912 | if (ce) |
| 913 | mb_cache_entry_release(ce); |
| 914 | brelse(new_bh); |
| 915 | if (!(bs->bh && s->base == bs->bh->b_data)) |
| 916 | kfree(s->base); |
| 917 | |
| 918 | return error; |
| 919 | |
| 920 | cleanup_dquot: |
Christoph Hellwig | 5dd4056 | 2010-03-03 09:05:00 -0500 | [diff] [blame] | 921 | dquot_free_block(inode, 1); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 922 | goto cleanup; |
| 923 | |
| 924 | bad_block: |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 925 | EXT4_ERROR_INODE(inode, "bad block %llu", |
| 926 | EXT4_I(inode)->i_file_acl); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 927 | goto cleanup; |
| 928 | |
| 929 | #undef header |
| 930 | } |
| 931 | |
Tao Ma | 879b382 | 2012-12-05 10:28:46 -0500 | [diff] [blame] | 932 | int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
| 933 | struct ext4_xattr_ibody_find *is) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 934 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 935 | struct ext4_xattr_ibody_header *header; |
| 936 | struct ext4_inode *raw_inode; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 937 | int error; |
| 938 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 939 | if (EXT4_I(inode)->i_extra_isize == 0) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 940 | return 0; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 941 | raw_inode = ext4_raw_inode(&is->iloc); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 942 | header = IHDR(inode, raw_inode); |
| 943 | is->s.base = is->s.first = IFIRST(header); |
| 944 | is->s.here = is->s.first; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 945 | is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 946 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 947 | error = ext4_xattr_check_names(IFIRST(header), is->s.end); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 948 | if (error) |
| 949 | return error; |
| 950 | /* Find the named attribute. */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 951 | error = ext4_xattr_find_entry(&is->s.here, i->name_index, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 952 | i->name, is->s.end - |
| 953 | (void *)is->s.base, 0); |
| 954 | if (error && error != -ENODATA) |
| 955 | return error; |
| 956 | is->s.not_found = error; |
| 957 | } |
| 958 | return 0; |
| 959 | } |
| 960 | |
Tao Ma | 0d812f7 | 2012-12-10 14:06:02 -0500 | [diff] [blame] | 961 | int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, |
| 962 | struct ext4_xattr_info *i, |
| 963 | struct ext4_xattr_ibody_find *is) |
| 964 | { |
| 965 | struct ext4_xattr_ibody_header *header; |
| 966 | struct ext4_xattr_search *s = &is->s; |
| 967 | int error; |
| 968 | |
| 969 | if (EXT4_I(inode)->i_extra_isize == 0) |
| 970 | return -ENOSPC; |
| 971 | error = ext4_xattr_set_entry(i, s); |
| 972 | if (error) { |
| 973 | if (error == -ENOSPC && |
| 974 | ext4_has_inline_data(inode)) { |
| 975 | error = ext4_try_to_evict_inline_data(handle, inode, |
| 976 | EXT4_XATTR_LEN(strlen(i->name) + |
| 977 | EXT4_XATTR_SIZE(i->value_len))); |
| 978 | if (error) |
| 979 | return error; |
| 980 | error = ext4_xattr_ibody_find(inode, i, is); |
| 981 | if (error) |
| 982 | return error; |
| 983 | error = ext4_xattr_set_entry(i, s); |
| 984 | } |
| 985 | if (error) |
| 986 | return error; |
| 987 | } |
| 988 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
| 989 | if (!IS_LAST_ENTRY(s->first)) { |
| 990 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
| 991 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
| 992 | } else { |
| 993 | header->h_magic = cpu_to_le32(0); |
| 994 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
| 995 | } |
| 996 | return 0; |
| 997 | } |
| 998 | |
| 999 | static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, |
| 1000 | struct ext4_xattr_info *i, |
| 1001 | struct ext4_xattr_ibody_find *is) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1002 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1003 | struct ext4_xattr_ibody_header *header; |
| 1004 | struct ext4_xattr_search *s = &is->s; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1005 | int error; |
| 1006 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1007 | if (EXT4_I(inode)->i_extra_isize == 0) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1008 | return -ENOSPC; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1009 | error = ext4_xattr_set_entry(i, s); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1010 | if (error) |
| 1011 | return error; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1012 | header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1013 | if (!IS_LAST_ENTRY(s->first)) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1014 | header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 1015 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1016 | } else { |
| 1017 | header->h_magic = cpu_to_le32(0); |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 1018 | ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1019 | } |
| 1020 | return 0; |
| 1021 | } |
| 1022 | |
| 1023 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1024 | * ext4_xattr_set_handle() |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1025 | * |
Wang Sheng-Hui | 6e9510b | 2011-01-10 12:10:30 -0500 | [diff] [blame] | 1026 | * Create, replace or remove an extended attribute for this inode. Value |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1027 | * is NULL to remove an existing extended attribute, and non-NULL to |
| 1028 | * either replace an existing extended attribute, or create a new extended |
| 1029 | * attribute. The flags XATTR_REPLACE and XATTR_CREATE |
| 1030 | * specify that an extended attribute must exist and must not exist |
| 1031 | * previous to the call, respectively. |
| 1032 | * |
| 1033 | * Returns 0, or a negative error number on failure. |
| 1034 | */ |
| 1035 | int |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1036 | ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1037 | const char *name, const void *value, size_t value_len, |
| 1038 | int flags) |
| 1039 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1040 | struct ext4_xattr_info i = { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1041 | .name_index = name_index, |
| 1042 | .name = name, |
| 1043 | .value = value, |
| 1044 | .value_len = value_len, |
| 1045 | |
| 1046 | }; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1047 | struct ext4_xattr_ibody_find is = { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1048 | .s = { .not_found = -ENODATA, }, |
| 1049 | }; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1050 | struct ext4_xattr_block_find bs = { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1051 | .s = { .not_found = -ENODATA, }, |
| 1052 | }; |
Kalpak Shah | 4d20c68 | 2008-10-08 23:21:54 -0400 | [diff] [blame] | 1053 | unsigned long no_expand; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1054 | int error; |
| 1055 | |
| 1056 | if (!name) |
| 1057 | return -EINVAL; |
| 1058 | if (strlen(name) > 255) |
| 1059 | return -ERANGE; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1060 | down_write(&EXT4_I(inode)->xattr_sem); |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 1061 | no_expand = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND); |
| 1062 | ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND); |
Kalpak Shah | 4d20c68 | 2008-10-08 23:21:54 -0400 | [diff] [blame] | 1063 | |
Eric Sandeen | 6654361 | 2011-10-26 03:32:07 -0400 | [diff] [blame] | 1064 | error = ext4_reserve_inode_write(handle, inode, &is.iloc); |
Eric Sandeen | 86ebfd0 | 2009-11-15 15:30:52 -0500 | [diff] [blame] | 1065 | if (error) |
| 1066 | goto cleanup; |
| 1067 | |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 1068 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1069 | struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); |
| 1070 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 1071 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1072 | } |
| 1073 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1074 | error = ext4_xattr_ibody_find(inode, &i, &is); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1075 | if (error) |
| 1076 | goto cleanup; |
| 1077 | if (is.s.not_found) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1078 | error = ext4_xattr_block_find(inode, &i, &bs); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1079 | if (error) |
| 1080 | goto cleanup; |
| 1081 | if (is.s.not_found && bs.s.not_found) { |
| 1082 | error = -ENODATA; |
| 1083 | if (flags & XATTR_REPLACE) |
| 1084 | goto cleanup; |
| 1085 | error = 0; |
| 1086 | if (!value) |
| 1087 | goto cleanup; |
| 1088 | } else { |
| 1089 | error = -EEXIST; |
| 1090 | if (flags & XATTR_CREATE) |
| 1091 | goto cleanup; |
| 1092 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1093 | if (!value) { |
| 1094 | if (!is.s.not_found) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1095 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1096 | else if (!bs.s.not_found) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1097 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1098 | } else { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1099 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1100 | if (!error && !bs.s.not_found) { |
| 1101 | i.value = NULL; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1102 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1103 | } else if (error == -ENOSPC) { |
Tiger Yang | 7e01c8e | 2008-05-14 16:05:47 -0700 | [diff] [blame] | 1104 | if (EXT4_I(inode)->i_file_acl && !bs.s.base) { |
| 1105 | error = ext4_xattr_block_find(inode, &i, &bs); |
| 1106 | if (error) |
| 1107 | goto cleanup; |
| 1108 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1109 | error = ext4_xattr_block_set(handle, inode, &i, &bs); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1110 | if (error) |
| 1111 | goto cleanup; |
| 1112 | if (!is.s.not_found) { |
| 1113 | i.value = NULL; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1114 | error = ext4_xattr_ibody_set(handle, inode, &i, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1115 | &is); |
| 1116 | } |
| 1117 | } |
| 1118 | } |
| 1119 | if (!error) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1120 | ext4_xattr_update_super_block(handle, inode->i_sb); |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 1121 | inode->i_ctime = ext4_current_time(inode); |
Kalpak Shah | 6dd4ee7 | 2007-07-18 09:19:57 -0400 | [diff] [blame] | 1122 | if (!value) |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 1123 | ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1124 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1125 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1126 | * The bh is consumed by ext4_mark_iloc_dirty, even with |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1127 | * error != 0. |
| 1128 | */ |
| 1129 | is.iloc.bh = NULL; |
| 1130 | if (IS_SYNC(inode)) |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 1131 | ext4_handle_sync(handle); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1132 | } |
| 1133 | |
| 1134 | cleanup: |
| 1135 | brelse(is.iloc.bh); |
| 1136 | brelse(bs.bh); |
Kalpak Shah | 4d20c68 | 2008-10-08 23:21:54 -0400 | [diff] [blame] | 1137 | if (no_expand == 0) |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 1138 | ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1139 | up_write(&EXT4_I(inode)->xattr_sem); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1140 | return error; |
| 1141 | } |
| 1142 | |
| 1143 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1144 | * ext4_xattr_set() |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1145 | * |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1146 | * Like ext4_xattr_set_handle, but start from an inode. This extended |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1147 | * attribute modification is a filesystem transaction by itself. |
| 1148 | * |
| 1149 | * Returns 0, or a negative error number on failure. |
| 1150 | */ |
| 1151 | int |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1152 | ext4_xattr_set(struct inode *inode, int name_index, const char *name, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1153 | const void *value, size_t value_len, int flags) |
| 1154 | { |
| 1155 | handle_t *handle; |
| 1156 | int error, retries = 0; |
Tao Ma | 0d812f7 | 2012-12-10 14:06:02 -0500 | [diff] [blame] | 1157 | int credits = EXT4_DATA_TRANS_BLOCKS(inode->i_sb); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1158 | |
| 1159 | retry: |
Tao Ma | 0d812f7 | 2012-12-10 14:06:02 -0500 | [diff] [blame] | 1160 | /* |
| 1161 | * In case of inline data, we may push out the data to a block, |
| 1162 | * So reserve the journal space first. |
| 1163 | */ |
| 1164 | if (ext4_has_inline_data(inode)) |
| 1165 | credits += ext4_writepage_trans_blocks(inode) + 1; |
| 1166 | |
| 1167 | handle = ext4_journal_start(inode, credits); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1168 | if (IS_ERR(handle)) { |
| 1169 | error = PTR_ERR(handle); |
| 1170 | } else { |
| 1171 | int error2; |
| 1172 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1173 | error = ext4_xattr_set_handle(handle, inode, name_index, name, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1174 | value, value_len, flags); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1175 | error2 = ext4_journal_stop(handle); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1176 | if (error == -ENOSPC && |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1177 | ext4_should_retry_alloc(inode->i_sb, &retries)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1178 | goto retry; |
| 1179 | if (error == 0) |
| 1180 | error = error2; |
| 1181 | } |
| 1182 | |
| 1183 | return error; |
| 1184 | } |
| 1185 | |
| 1186 | /* |
Kalpak Shah | 6dd4ee7 | 2007-07-18 09:19:57 -0400 | [diff] [blame] | 1187 | * Shift the EA entries in the inode to create space for the increased |
| 1188 | * i_extra_isize. |
| 1189 | */ |
| 1190 | static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, |
| 1191 | int value_offs_shift, void *to, |
| 1192 | void *from, size_t n, int blocksize) |
| 1193 | { |
| 1194 | struct ext4_xattr_entry *last = entry; |
| 1195 | int new_offs; |
| 1196 | |
| 1197 | /* Adjust the value offsets of the entries */ |
| 1198 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { |
| 1199 | if (!last->e_value_block && last->e_value_size) { |
| 1200 | new_offs = le16_to_cpu(last->e_value_offs) + |
| 1201 | value_offs_shift; |
| 1202 | BUG_ON(new_offs + le32_to_cpu(last->e_value_size) |
| 1203 | > blocksize); |
| 1204 | last->e_value_offs = cpu_to_le16(new_offs); |
| 1205 | } |
| 1206 | } |
| 1207 | /* Shift the entries by n bytes */ |
| 1208 | memmove(to, from, n); |
| 1209 | } |
| 1210 | |
| 1211 | /* |
| 1212 | * Expand an inode by new_extra_isize bytes when EAs are present. |
| 1213 | * Returns 0 on success or negative error number on failure. |
| 1214 | */ |
| 1215 | int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, |
| 1216 | struct ext4_inode *raw_inode, handle_t *handle) |
| 1217 | { |
| 1218 | struct ext4_xattr_ibody_header *header; |
| 1219 | struct ext4_xattr_entry *entry, *last, *first; |
| 1220 | struct buffer_head *bh = NULL; |
| 1221 | struct ext4_xattr_ibody_find *is = NULL; |
| 1222 | struct ext4_xattr_block_find *bs = NULL; |
| 1223 | char *buffer = NULL, *b_entry_name = NULL; |
| 1224 | size_t min_offs, free; |
| 1225 | int total_ino, total_blk; |
| 1226 | void *base, *start, *end; |
| 1227 | int extra_isize = 0, error = 0, tried_min_extra_isize = 0; |
Aneesh Kumar K.V | ac39849 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 1228 | int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); |
Kalpak Shah | 6dd4ee7 | 2007-07-18 09:19:57 -0400 | [diff] [blame] | 1229 | |
| 1230 | down_write(&EXT4_I(inode)->xattr_sem); |
| 1231 | retry: |
| 1232 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) { |
| 1233 | up_write(&EXT4_I(inode)->xattr_sem); |
| 1234 | return 0; |
| 1235 | } |
| 1236 | |
| 1237 | header = IHDR(inode, raw_inode); |
| 1238 | entry = IFIRST(header); |
| 1239 | |
| 1240 | /* |
| 1241 | * Check if enough free space is available in the inode to shift the |
| 1242 | * entries ahead by new_extra_isize. |
| 1243 | */ |
| 1244 | |
| 1245 | base = start = entry; |
| 1246 | end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
| 1247 | min_offs = end - base; |
| 1248 | last = entry; |
| 1249 | total_ino = sizeof(struct ext4_xattr_ibody_header); |
| 1250 | |
| 1251 | free = ext4_xattr_free_space(last, &min_offs, base, &total_ino); |
| 1252 | if (free >= new_extra_isize) { |
| 1253 | entry = IFIRST(header); |
| 1254 | ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize |
| 1255 | - new_extra_isize, (void *)raw_inode + |
| 1256 | EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, |
| 1257 | (void *)header, total_ino, |
| 1258 | inode->i_sb->s_blocksize); |
| 1259 | EXT4_I(inode)->i_extra_isize = new_extra_isize; |
| 1260 | error = 0; |
| 1261 | goto cleanup; |
| 1262 | } |
| 1263 | |
| 1264 | /* |
| 1265 | * Enough free space isn't available in the inode, check if |
| 1266 | * EA block can hold new_extra_isize bytes. |
| 1267 | */ |
| 1268 | if (EXT4_I(inode)->i_file_acl) { |
| 1269 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
| 1270 | error = -EIO; |
| 1271 | if (!bh) |
| 1272 | goto cleanup; |
Darrick J. Wong | cc8e94f | 2012-04-29 18:43:10 -0400 | [diff] [blame] | 1273 | if (ext4_xattr_check_block(inode, bh)) { |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 1274 | EXT4_ERROR_INODE(inode, "bad block %llu", |
| 1275 | EXT4_I(inode)->i_file_acl); |
Kalpak Shah | 6dd4ee7 | 2007-07-18 09:19:57 -0400 | [diff] [blame] | 1276 | error = -EIO; |
| 1277 | goto cleanup; |
| 1278 | } |
| 1279 | base = BHDR(bh); |
| 1280 | first = BFIRST(bh); |
| 1281 | end = bh->b_data + bh->b_size; |
| 1282 | min_offs = end - base; |
| 1283 | free = ext4_xattr_free_space(first, &min_offs, base, |
| 1284 | &total_blk); |
| 1285 | if (free < new_extra_isize) { |
| 1286 | if (!tried_min_extra_isize && s_min_extra_isize) { |
| 1287 | tried_min_extra_isize++; |
| 1288 | new_extra_isize = s_min_extra_isize; |
| 1289 | brelse(bh); |
| 1290 | goto retry; |
| 1291 | } |
| 1292 | error = -1; |
| 1293 | goto cleanup; |
| 1294 | } |
| 1295 | } else { |
| 1296 | free = inode->i_sb->s_blocksize; |
| 1297 | } |
| 1298 | |
| 1299 | while (new_extra_isize > 0) { |
| 1300 | size_t offs, size, entry_size; |
| 1301 | struct ext4_xattr_entry *small_entry = NULL; |
| 1302 | struct ext4_xattr_info i = { |
| 1303 | .value = NULL, |
| 1304 | .value_len = 0, |
| 1305 | }; |
| 1306 | unsigned int total_size; /* EA entry size + value size */ |
| 1307 | unsigned int shift_bytes; /* No. of bytes to shift EAs by? */ |
| 1308 | unsigned int min_total_size = ~0U; |
| 1309 | |
| 1310 | is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); |
| 1311 | bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); |
| 1312 | if (!is || !bs) { |
| 1313 | error = -ENOMEM; |
| 1314 | goto cleanup; |
| 1315 | } |
| 1316 | |
| 1317 | is->s.not_found = -ENODATA; |
| 1318 | bs->s.not_found = -ENODATA; |
| 1319 | is->iloc.bh = NULL; |
| 1320 | bs->bh = NULL; |
| 1321 | |
| 1322 | last = IFIRST(header); |
| 1323 | /* Find the entry best suited to be pushed into EA block */ |
| 1324 | entry = NULL; |
| 1325 | for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { |
| 1326 | total_size = |
| 1327 | EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + |
| 1328 | EXT4_XATTR_LEN(last->e_name_len); |
| 1329 | if (total_size <= free && total_size < min_total_size) { |
| 1330 | if (total_size < new_extra_isize) { |
| 1331 | small_entry = last; |
| 1332 | } else { |
| 1333 | entry = last; |
| 1334 | min_total_size = total_size; |
| 1335 | } |
| 1336 | } |
| 1337 | } |
| 1338 | |
| 1339 | if (entry == NULL) { |
| 1340 | if (small_entry) { |
| 1341 | entry = small_entry; |
| 1342 | } else { |
| 1343 | if (!tried_min_extra_isize && |
| 1344 | s_min_extra_isize) { |
| 1345 | tried_min_extra_isize++; |
| 1346 | new_extra_isize = s_min_extra_isize; |
| 1347 | goto retry; |
| 1348 | } |
| 1349 | error = -1; |
| 1350 | goto cleanup; |
| 1351 | } |
| 1352 | } |
| 1353 | offs = le16_to_cpu(entry->e_value_offs); |
| 1354 | size = le32_to_cpu(entry->e_value_size); |
| 1355 | entry_size = EXT4_XATTR_LEN(entry->e_name_len); |
| 1356 | i.name_index = entry->e_name_index, |
| 1357 | buffer = kmalloc(EXT4_XATTR_SIZE(size), GFP_NOFS); |
| 1358 | b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); |
| 1359 | if (!buffer || !b_entry_name) { |
| 1360 | error = -ENOMEM; |
| 1361 | goto cleanup; |
| 1362 | } |
| 1363 | /* Save the entry name and the entry value */ |
| 1364 | memcpy(buffer, (void *)IFIRST(header) + offs, |
| 1365 | EXT4_XATTR_SIZE(size)); |
| 1366 | memcpy(b_entry_name, entry->e_name, entry->e_name_len); |
| 1367 | b_entry_name[entry->e_name_len] = '\0'; |
| 1368 | i.name = b_entry_name; |
| 1369 | |
| 1370 | error = ext4_get_inode_loc(inode, &is->iloc); |
| 1371 | if (error) |
| 1372 | goto cleanup; |
| 1373 | |
| 1374 | error = ext4_xattr_ibody_find(inode, &i, is); |
| 1375 | if (error) |
| 1376 | goto cleanup; |
| 1377 | |
| 1378 | /* Remove the chosen entry from the inode */ |
| 1379 | error = ext4_xattr_ibody_set(handle, inode, &i, is); |
Roel Kluin | 9aaab05 | 2010-02-15 14:26:16 -0500 | [diff] [blame] | 1380 | if (error) |
| 1381 | goto cleanup; |
Kalpak Shah | 6dd4ee7 | 2007-07-18 09:19:57 -0400 | [diff] [blame] | 1382 | |
| 1383 | entry = IFIRST(header); |
| 1384 | if (entry_size + EXT4_XATTR_SIZE(size) >= new_extra_isize) |
| 1385 | shift_bytes = new_extra_isize; |
| 1386 | else |
| 1387 | shift_bytes = entry_size + size; |
| 1388 | /* Adjust the offsets and shift the remaining entries ahead */ |
| 1389 | ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize - |
| 1390 | shift_bytes, (void *)raw_inode + |
| 1391 | EXT4_GOOD_OLD_INODE_SIZE + extra_isize + shift_bytes, |
| 1392 | (void *)header, total_ino - entry_size, |
| 1393 | inode->i_sb->s_blocksize); |
| 1394 | |
| 1395 | extra_isize += shift_bytes; |
| 1396 | new_extra_isize -= shift_bytes; |
| 1397 | EXT4_I(inode)->i_extra_isize = extra_isize; |
| 1398 | |
| 1399 | i.name = b_entry_name; |
| 1400 | i.value = buffer; |
Aneesh Kumar K.V | ac39849 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 1401 | i.value_len = size; |
Kalpak Shah | 6dd4ee7 | 2007-07-18 09:19:57 -0400 | [diff] [blame] | 1402 | error = ext4_xattr_block_find(inode, &i, bs); |
| 1403 | if (error) |
| 1404 | goto cleanup; |
| 1405 | |
| 1406 | /* Add entry which was removed from the inode into the block */ |
| 1407 | error = ext4_xattr_block_set(handle, inode, &i, bs); |
| 1408 | if (error) |
| 1409 | goto cleanup; |
| 1410 | kfree(b_entry_name); |
| 1411 | kfree(buffer); |
Julia Lawall | d3533d7 | 2009-12-23 07:52:31 -0500 | [diff] [blame] | 1412 | b_entry_name = NULL; |
| 1413 | buffer = NULL; |
Kalpak Shah | 6dd4ee7 | 2007-07-18 09:19:57 -0400 | [diff] [blame] | 1414 | brelse(is->iloc.bh); |
| 1415 | kfree(is); |
| 1416 | kfree(bs); |
| 1417 | } |
| 1418 | brelse(bh); |
| 1419 | up_write(&EXT4_I(inode)->xattr_sem); |
| 1420 | return 0; |
| 1421 | |
| 1422 | cleanup: |
| 1423 | kfree(b_entry_name); |
| 1424 | kfree(buffer); |
| 1425 | if (is) |
| 1426 | brelse(is->iloc.bh); |
| 1427 | kfree(is); |
| 1428 | kfree(bs); |
| 1429 | brelse(bh); |
| 1430 | up_write(&EXT4_I(inode)->xattr_sem); |
| 1431 | return error; |
| 1432 | } |
| 1433 | |
| 1434 | |
| 1435 | |
| 1436 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1437 | * ext4_xattr_delete_inode() |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1438 | * |
| 1439 | * Free extended attribute resources associated with this inode. This |
| 1440 | * is called immediately before an inode is freed. We have exclusive |
| 1441 | * access to the inode. |
| 1442 | */ |
| 1443 | void |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1444 | ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1445 | { |
| 1446 | struct buffer_head *bh = NULL; |
| 1447 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1448 | if (!EXT4_I(inode)->i_file_acl) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1449 | goto cleanup; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1450 | bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1451 | if (!bh) { |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 1452 | EXT4_ERROR_INODE(inode, "block %llu read error", |
| 1453 | EXT4_I(inode)->i_file_acl); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1454 | goto cleanup; |
| 1455 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1456 | if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1457 | BHDR(bh)->h_blocks != cpu_to_le32(1)) { |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 1458 | EXT4_ERROR_INODE(inode, "bad block %llu", |
| 1459 | EXT4_I(inode)->i_file_acl); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1460 | goto cleanup; |
| 1461 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1462 | ext4_xattr_release_block(handle, inode, bh); |
| 1463 | EXT4_I(inode)->i_file_acl = 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1464 | |
| 1465 | cleanup: |
| 1466 | brelse(bh); |
| 1467 | } |
| 1468 | |
| 1469 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1470 | * ext4_xattr_put_super() |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1471 | * |
| 1472 | * This is called when a file system is unmounted. |
| 1473 | */ |
| 1474 | void |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1475 | ext4_xattr_put_super(struct super_block *sb) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1476 | { |
| 1477 | mb_cache_shrink(sb->s_bdev); |
| 1478 | } |
| 1479 | |
| 1480 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1481 | * ext4_xattr_cache_insert() |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1482 | * |
| 1483 | * Create a new entry in the extended attribute cache, and insert |
| 1484 | * it unless such an entry is already in the cache. |
| 1485 | * |
| 1486 | * Returns 0, or a negative error number on failure. |
| 1487 | */ |
| 1488 | static void |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1489 | ext4_xattr_cache_insert(struct buffer_head *bh) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1490 | { |
| 1491 | __u32 hash = le32_to_cpu(BHDR(bh)->h_hash); |
| 1492 | struct mb_cache_entry *ce; |
| 1493 | int error; |
| 1494 | |
Jan Kara | 335e92e | 2008-04-15 14:34:43 -0700 | [diff] [blame] | 1495 | ce = mb_cache_entry_alloc(ext4_xattr_cache, GFP_NOFS); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1496 | if (!ce) { |
| 1497 | ea_bdebug(bh, "out of memory"); |
| 1498 | return; |
| 1499 | } |
Andreas Gruenbacher | 2aec7c5 | 2010-07-19 18:19:41 +0200 | [diff] [blame] | 1500 | error = mb_cache_entry_insert(ce, bh->b_bdev, bh->b_blocknr, hash); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1501 | if (error) { |
| 1502 | mb_cache_entry_free(ce); |
| 1503 | if (error == -EBUSY) { |
| 1504 | ea_bdebug(bh, "already in cache"); |
| 1505 | error = 0; |
| 1506 | } |
| 1507 | } else { |
| 1508 | ea_bdebug(bh, "inserting [%x]", (int)hash); |
| 1509 | mb_cache_entry_release(ce); |
| 1510 | } |
| 1511 | } |
| 1512 | |
| 1513 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1514 | * ext4_xattr_cmp() |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1515 | * |
| 1516 | * Compare two extended attribute blocks for equality. |
| 1517 | * |
| 1518 | * Returns 0 if the blocks are equal, 1 if they differ, and |
| 1519 | * a negative error number on errors. |
| 1520 | */ |
| 1521 | static int |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1522 | ext4_xattr_cmp(struct ext4_xattr_header *header1, |
| 1523 | struct ext4_xattr_header *header2) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1524 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1525 | struct ext4_xattr_entry *entry1, *entry2; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1526 | |
| 1527 | entry1 = ENTRY(header1+1); |
| 1528 | entry2 = ENTRY(header2+1); |
| 1529 | while (!IS_LAST_ENTRY(entry1)) { |
| 1530 | if (IS_LAST_ENTRY(entry2)) |
| 1531 | return 1; |
| 1532 | if (entry1->e_hash != entry2->e_hash || |
| 1533 | entry1->e_name_index != entry2->e_name_index || |
| 1534 | entry1->e_name_len != entry2->e_name_len || |
| 1535 | entry1->e_value_size != entry2->e_value_size || |
| 1536 | memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) |
| 1537 | return 1; |
| 1538 | if (entry1->e_value_block != 0 || entry2->e_value_block != 0) |
| 1539 | return -EIO; |
| 1540 | if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), |
| 1541 | (char *)header2 + le16_to_cpu(entry2->e_value_offs), |
| 1542 | le32_to_cpu(entry1->e_value_size))) |
| 1543 | return 1; |
| 1544 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1545 | entry1 = EXT4_XATTR_NEXT(entry1); |
| 1546 | entry2 = EXT4_XATTR_NEXT(entry2); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1547 | } |
| 1548 | if (!IS_LAST_ENTRY(entry2)) |
| 1549 | return 1; |
| 1550 | return 0; |
| 1551 | } |
| 1552 | |
| 1553 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1554 | * ext4_xattr_cache_find() |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1555 | * |
| 1556 | * Find an identical extended attribute block. |
| 1557 | * |
| 1558 | * Returns a pointer to the block found, or NULL if such a block was |
| 1559 | * not found or an error occurred. |
| 1560 | */ |
| 1561 | static struct buffer_head * |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1562 | ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1563 | struct mb_cache_entry **pce) |
| 1564 | { |
| 1565 | __u32 hash = le32_to_cpu(header->h_hash); |
| 1566 | struct mb_cache_entry *ce; |
| 1567 | |
| 1568 | if (!header->h_hash) |
| 1569 | return NULL; /* never share */ |
| 1570 | ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); |
| 1571 | again: |
Andreas Gruenbacher | 2aec7c5 | 2010-07-19 18:19:41 +0200 | [diff] [blame] | 1572 | ce = mb_cache_entry_find_first(ext4_xattr_cache, inode->i_sb->s_bdev, |
| 1573 | hash); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1574 | while (ce) { |
| 1575 | struct buffer_head *bh; |
| 1576 | |
| 1577 | if (IS_ERR(ce)) { |
| 1578 | if (PTR_ERR(ce) == -EAGAIN) |
| 1579 | goto again; |
| 1580 | break; |
| 1581 | } |
| 1582 | bh = sb_bread(inode->i_sb, ce->e_block); |
| 1583 | if (!bh) { |
Theodore Ts'o | 24676da | 2010-05-16 21:00:00 -0400 | [diff] [blame] | 1584 | EXT4_ERROR_INODE(inode, "block %lu read error", |
| 1585 | (unsigned long) ce->e_block); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1586 | } else if (le32_to_cpu(BHDR(bh)->h_refcount) >= |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1587 | EXT4_XATTR_REFCOUNT_MAX) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1588 | ea_idebug(inode, "block %lu refcount %d>=%d", |
| 1589 | (unsigned long) ce->e_block, |
| 1590 | le32_to_cpu(BHDR(bh)->h_refcount), |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1591 | EXT4_XATTR_REFCOUNT_MAX); |
| 1592 | } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1593 | *pce = ce; |
| 1594 | return bh; |
| 1595 | } |
| 1596 | brelse(bh); |
Andreas Gruenbacher | 2aec7c5 | 2010-07-19 18:19:41 +0200 | [diff] [blame] | 1597 | ce = mb_cache_entry_find_next(ce, inode->i_sb->s_bdev, hash); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1598 | } |
| 1599 | return NULL; |
| 1600 | } |
| 1601 | |
| 1602 | #define NAME_HASH_SHIFT 5 |
| 1603 | #define VALUE_HASH_SHIFT 16 |
| 1604 | |
| 1605 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1606 | * ext4_xattr_hash_entry() |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1607 | * |
| 1608 | * Compute the hash of an extended attribute. |
| 1609 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1610 | static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, |
| 1611 | struct ext4_xattr_entry *entry) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1612 | { |
| 1613 | __u32 hash = 0; |
| 1614 | char *name = entry->e_name; |
| 1615 | int n; |
| 1616 | |
Theodore Ts'o | 2b2d6d0 | 2008-07-26 16:15:44 -0400 | [diff] [blame] | 1617 | for (n = 0; n < entry->e_name_len; n++) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1618 | hash = (hash << NAME_HASH_SHIFT) ^ |
| 1619 | (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ |
| 1620 | *name++; |
| 1621 | } |
| 1622 | |
| 1623 | if (entry->e_value_block == 0 && entry->e_value_size != 0) { |
| 1624 | __le32 *value = (__le32 *)((char *)header + |
| 1625 | le16_to_cpu(entry->e_value_offs)); |
| 1626 | for (n = (le32_to_cpu(entry->e_value_size) + |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1627 | EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1628 | hash = (hash << VALUE_HASH_SHIFT) ^ |
| 1629 | (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ |
| 1630 | le32_to_cpu(*value++); |
| 1631 | } |
| 1632 | } |
| 1633 | entry->e_hash = cpu_to_le32(hash); |
| 1634 | } |
| 1635 | |
| 1636 | #undef NAME_HASH_SHIFT |
| 1637 | #undef VALUE_HASH_SHIFT |
| 1638 | |
| 1639 | #define BLOCK_HASH_SHIFT 16 |
| 1640 | |
| 1641 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1642 | * ext4_xattr_rehash() |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1643 | * |
| 1644 | * Re-compute the extended attribute hash value after an entry has changed. |
| 1645 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1646 | static void ext4_xattr_rehash(struct ext4_xattr_header *header, |
| 1647 | struct ext4_xattr_entry *entry) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1648 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1649 | struct ext4_xattr_entry *here; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1650 | __u32 hash = 0; |
| 1651 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1652 | ext4_xattr_hash_entry(header, entry); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1653 | here = ENTRY(header+1); |
| 1654 | while (!IS_LAST_ENTRY(here)) { |
| 1655 | if (!here->e_hash) { |
| 1656 | /* Block is not shared if an entry's hash value == 0 */ |
| 1657 | hash = 0; |
| 1658 | break; |
| 1659 | } |
| 1660 | hash = (hash << BLOCK_HASH_SHIFT) ^ |
| 1661 | (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ |
| 1662 | le32_to_cpu(here->e_hash); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1663 | here = EXT4_XATTR_NEXT(here); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1664 | } |
| 1665 | header->h_hash = cpu_to_le32(hash); |
| 1666 | } |
| 1667 | |
| 1668 | #undef BLOCK_HASH_SHIFT |
| 1669 | |
| 1670 | int __init |
Theodore Ts'o | 5dabfc7 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1671 | ext4_init_xattr(void) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1672 | { |
Andreas Gruenbacher | 2aec7c5 | 2010-07-19 18:19:41 +0200 | [diff] [blame] | 1673 | ext4_xattr_cache = mb_cache_create("ext4_xattr", 6); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1674 | if (!ext4_xattr_cache) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1675 | return -ENOMEM; |
| 1676 | return 0; |
| 1677 | } |
| 1678 | |
| 1679 | void |
Theodore Ts'o | 5dabfc7 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 1680 | ext4_exit_xattr(void) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1681 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1682 | if (ext4_xattr_cache) |
| 1683 | mb_cache_destroy(ext4_xattr_cache); |
| 1684 | ext4_xattr_cache = NULL; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1685 | } |