1ac27a0ecSDave Kleikamp /* 2617ba13bSMingming Cao * linux/fs/ext4/xattr.c 3ac27a0ecSDave Kleikamp * 4ac27a0ecSDave Kleikamp * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> 5ac27a0ecSDave Kleikamp * 6ac27a0ecSDave Kleikamp * Fix by Harrison Xing <harrison@mountainviewdata.com>. 7617ba13bSMingming Cao * Ext4 code with a lot of help from Eric Jarman <ejarman@acm.org>. 8ac27a0ecSDave Kleikamp * Extended attributes for symlinks and special files added per 9ac27a0ecSDave Kleikamp * suggestion of Luka Renko <luka.renko@hermes.si>. 10ac27a0ecSDave Kleikamp * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>, 11ac27a0ecSDave Kleikamp * Red Hat Inc. 12ac27a0ecSDave Kleikamp * ea-in-inode support by Alex Tomas <alex@clusterfs.com> aka bzzz 13ac27a0ecSDave Kleikamp * and Andreas Gruenbacher <agruen@suse.de>. 14ac27a0ecSDave Kleikamp */ 15ac27a0ecSDave Kleikamp 16ac27a0ecSDave Kleikamp /* 17ac27a0ecSDave Kleikamp * Extended attributes are stored directly in inodes (on file systems with 18ac27a0ecSDave Kleikamp * inodes bigger than 128 bytes) and on additional disk blocks. The i_file_acl 19ac27a0ecSDave Kleikamp * field contains the block number if an inode uses an additional block. All 20ac27a0ecSDave Kleikamp * attributes must fit in the inode and one additional block. Blocks that 21ac27a0ecSDave Kleikamp * contain the identical set of attributes may be shared among several inodes. 22ac27a0ecSDave Kleikamp * Identical blocks are detected by keeping a cache of blocks that have 23ac27a0ecSDave Kleikamp * recently been accessed. 24ac27a0ecSDave Kleikamp * 25ac27a0ecSDave Kleikamp * The attributes in inodes and on blocks have a different header; the entries 26ac27a0ecSDave Kleikamp * are stored in the same format: 27ac27a0ecSDave Kleikamp * 28ac27a0ecSDave Kleikamp * +------------------+ 29ac27a0ecSDave Kleikamp * | header | 30ac27a0ecSDave Kleikamp * | entry 1 | | 31ac27a0ecSDave Kleikamp * | entry 2 | | growing downwards 32ac27a0ecSDave Kleikamp * | entry 3 | v 33ac27a0ecSDave Kleikamp * | four null bytes | 34ac27a0ecSDave Kleikamp * | . . . | 35ac27a0ecSDave Kleikamp * | value 1 | ^ 36ac27a0ecSDave Kleikamp * | value 3 | | growing upwards 37ac27a0ecSDave Kleikamp * | value 2 | | 38ac27a0ecSDave Kleikamp * +------------------+ 39ac27a0ecSDave Kleikamp * 40ac27a0ecSDave Kleikamp * The header is followed by multiple entry descriptors. In disk blocks, the 41ac27a0ecSDave Kleikamp * entry descriptors are kept sorted. In inodes, they are unsorted. The 42ac27a0ecSDave Kleikamp * attribute values are aligned to the end of the block in no specific order. 43ac27a0ecSDave Kleikamp * 44ac27a0ecSDave Kleikamp * Locking strategy 45ac27a0ecSDave Kleikamp * ---------------- 46617ba13bSMingming Cao * EXT4_I(inode)->i_file_acl is protected by EXT4_I(inode)->xattr_sem. 47ac27a0ecSDave Kleikamp * EA blocks are only changed if they are exclusive to an inode, so 48ac27a0ecSDave Kleikamp * holding xattr_sem also means that nothing but the EA block's reference 49ac27a0ecSDave Kleikamp * count can change. Multiple writers to the same block are synchronized 50ac27a0ecSDave Kleikamp * by the buffer lock. 51ac27a0ecSDave Kleikamp */ 52ac27a0ecSDave Kleikamp 53ac27a0ecSDave Kleikamp #include <linux/init.h> 54ac27a0ecSDave Kleikamp #include <linux/fs.h> 55ac27a0ecSDave Kleikamp #include <linux/slab.h> 567a2508e1SJan Kara #include <linux/mbcache.h> 57ac27a0ecSDave Kleikamp #include <linux/quotaops.h> 583dcf5451SChristoph Hellwig #include "ext4_jbd2.h" 593dcf5451SChristoph Hellwig #include "ext4.h" 60ac27a0ecSDave Kleikamp #include "xattr.h" 61ac27a0ecSDave Kleikamp #include "acl.h" 62ac27a0ecSDave Kleikamp 63617ba13bSMingming Cao #ifdef EXT4_XATTR_DEBUG 64d74f3d25SJoe Perches # define ea_idebug(inode, fmt, ...) \ 65d74f3d25SJoe Perches printk(KERN_DEBUG "inode %s:%lu: " fmt "\n", \ 66d74f3d25SJoe Perches inode->i_sb->s_id, inode->i_ino, ##__VA_ARGS__) 67d74f3d25SJoe Perches # define ea_bdebug(bh, fmt, ...) \ 68d74f3d25SJoe Perches printk(KERN_DEBUG "block %pg:%lu: " fmt "\n", \ 69d74f3d25SJoe Perches bh->b_bdev, (unsigned long)bh->b_blocknr, ##__VA_ARGS__) 70ac27a0ecSDave Kleikamp #else 71ace36ad4SJoe Perches # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 72ace36ad4SJoe Perches # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 73ac27a0ecSDave Kleikamp #endif 74ac27a0ecSDave Kleikamp 757a2508e1SJan Kara static void ext4_xattr_cache_insert(struct mb_cache *, struct buffer_head *); 76617ba13bSMingming Cao static struct buffer_head *ext4_xattr_cache_find(struct inode *, 77617ba13bSMingming Cao struct ext4_xattr_header *, 787a2508e1SJan Kara struct mb_cache_entry **); 79617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *, 80617ba13bSMingming Cao struct ext4_xattr_entry *); 81ac27a0ecSDave Kleikamp 82d6006186SEric Biggers static const struct xattr_handler * const ext4_xattr_handler_map[] = { 83617ba13bSMingming Cao [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, 8403010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 8564e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, 8664e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, 87ac27a0ecSDave Kleikamp #endif 88617ba13bSMingming Cao [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, 8903010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 90617ba13bSMingming Cao [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, 91ac27a0ecSDave Kleikamp #endif 92ac27a0ecSDave Kleikamp }; 93ac27a0ecSDave Kleikamp 9411e27528SStephen Hemminger const struct xattr_handler *ext4_xattr_handlers[] = { 95617ba13bSMingming Cao &ext4_xattr_user_handler, 96617ba13bSMingming Cao &ext4_xattr_trusted_handler, 9703010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 9864e178a7SChristoph Hellwig &posix_acl_access_xattr_handler, 9964e178a7SChristoph Hellwig &posix_acl_default_xattr_handler, 100ac27a0ecSDave Kleikamp #endif 10103010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 102617ba13bSMingming Cao &ext4_xattr_security_handler, 103ac27a0ecSDave Kleikamp #endif 104ac27a0ecSDave Kleikamp NULL 105ac27a0ecSDave Kleikamp }; 106ac27a0ecSDave Kleikamp 1079c191f70ST Makphaibulchoke #define EXT4_GET_MB_CACHE(inode) (((struct ext4_sb_info *) \ 1089c191f70ST Makphaibulchoke inode->i_sb->s_fs_info)->s_mb_cache) 1099c191f70ST Makphaibulchoke 110cc8e94fdSDarrick J. Wong static __le32 ext4_xattr_block_csum(struct inode *inode, 111cc8e94fdSDarrick J. Wong sector_t block_nr, 112cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 113cc8e94fdSDarrick J. Wong { 114cc8e94fdSDarrick J. Wong struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 115d6a77105STheodore Ts'o __u32 csum; 116d6a77105STheodore Ts'o __le64 dsk_block_nr = cpu_to_le64(block_nr); 117b47820edSDaeho Jeong __u32 dummy_csum = 0; 118b47820edSDaeho Jeong int offset = offsetof(struct ext4_xattr_header, h_checksum); 119cc8e94fdSDarrick J. Wong 120d6a77105STheodore Ts'o csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, 121d6a77105STheodore Ts'o sizeof(dsk_block_nr)); 122b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); 123b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); 124b47820edSDaeho Jeong offset += sizeof(dummy_csum); 125b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, 126b47820edSDaeho Jeong EXT4_BLOCK_SIZE(inode->i_sb) - offset); 12741eb70ddSTao Ma 128cc8e94fdSDarrick J. Wong return cpu_to_le32(csum); 129cc8e94fdSDarrick J. Wong } 130cc8e94fdSDarrick J. Wong 131cc8e94fdSDarrick J. Wong static int ext4_xattr_block_csum_verify(struct inode *inode, 132dac7a4b4STheodore Ts'o struct buffer_head *bh) 133cc8e94fdSDarrick J. Wong { 134dac7a4b4STheodore Ts'o struct ext4_xattr_header *hdr = BHDR(bh); 135dac7a4b4STheodore Ts'o int ret = 1; 136dac7a4b4STheodore Ts'o 137dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) { 138dac7a4b4STheodore Ts'o lock_buffer(bh); 139dac7a4b4STheodore Ts'o ret = (hdr->h_checksum == ext4_xattr_block_csum(inode, 140dac7a4b4STheodore Ts'o bh->b_blocknr, hdr)); 141dac7a4b4STheodore Ts'o unlock_buffer(bh); 142dac7a4b4STheodore Ts'o } 143dac7a4b4STheodore Ts'o return ret; 144cc8e94fdSDarrick J. Wong } 145cc8e94fdSDarrick J. Wong 146cc8e94fdSDarrick J. Wong static void ext4_xattr_block_csum_set(struct inode *inode, 147cc8e94fdSDarrick J. Wong struct buffer_head *bh) 148cc8e94fdSDarrick J. Wong { 149dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) 150dac7a4b4STheodore Ts'o BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode, 151dac7a4b4STheodore Ts'o bh->b_blocknr, BHDR(bh)); 152cc8e94fdSDarrick J. Wong } 153cc8e94fdSDarrick J. Wong 15411e27528SStephen Hemminger static inline const struct xattr_handler * 155617ba13bSMingming Cao ext4_xattr_handler(int name_index) 156ac27a0ecSDave Kleikamp { 15711e27528SStephen Hemminger const struct xattr_handler *handler = NULL; 158ac27a0ecSDave Kleikamp 159617ba13bSMingming Cao if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) 160617ba13bSMingming Cao handler = ext4_xattr_handler_map[name_index]; 161ac27a0ecSDave Kleikamp return handler; 162ac27a0ecSDave Kleikamp } 163ac27a0ecSDave Kleikamp 164ac27a0ecSDave Kleikamp static int 165a0626e75SDarrick J. Wong ext4_xattr_check_names(struct ext4_xattr_entry *entry, void *end, 166a0626e75SDarrick J. Wong void *value_start) 167ac27a0ecSDave Kleikamp { 168a0626e75SDarrick J. Wong struct ext4_xattr_entry *e = entry; 169a0626e75SDarrick J. Wong 170d7614cc1SEric Biggers /* Find the end of the names list */ 171a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(e)) { 172a0626e75SDarrick J. Wong struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); 173ac27a0ecSDave Kleikamp if ((void *)next >= end) 1746a797d27SDarrick J. Wong return -EFSCORRUPTED; 175a0626e75SDarrick J. Wong e = next; 176ac27a0ecSDave Kleikamp } 177a0626e75SDarrick J. Wong 178d7614cc1SEric Biggers /* Check the values */ 179a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(entry)) { 1802de58f11SJan Kara if (entry->e_value_block != 0) 1812de58f11SJan Kara return -EFSCORRUPTED; 182d7614cc1SEric Biggers if (entry->e_value_size != 0) { 183d7614cc1SEric Biggers u16 offs = le16_to_cpu(entry->e_value_offs); 184d7614cc1SEric Biggers u32 size = le32_to_cpu(entry->e_value_size); 185d7614cc1SEric Biggers void *value; 186d7614cc1SEric Biggers 187d7614cc1SEric Biggers /* 188d7614cc1SEric Biggers * The value cannot overlap the names, and the value 189d7614cc1SEric Biggers * with padding cannot extend beyond 'end'. Check both 190d7614cc1SEric Biggers * the padded and unpadded sizes, since the size may 191d7614cc1SEric Biggers * overflow to 0 when adding padding. 192d7614cc1SEric Biggers */ 193d7614cc1SEric Biggers if (offs > end - value_start) 1946a797d27SDarrick J. Wong return -EFSCORRUPTED; 195d7614cc1SEric Biggers value = value_start + offs; 196d7614cc1SEric Biggers if (value < (void *)e + sizeof(u32) || 197d7614cc1SEric Biggers size > end - value || 198d7614cc1SEric Biggers EXT4_XATTR_SIZE(size) > end - value) 199d7614cc1SEric Biggers return -EFSCORRUPTED; 200d7614cc1SEric Biggers } 201a0626e75SDarrick J. Wong entry = EXT4_XATTR_NEXT(entry); 202a0626e75SDarrick J. Wong } 203a0626e75SDarrick J. Wong 204ac27a0ecSDave Kleikamp return 0; 205ac27a0ecSDave Kleikamp } 206ac27a0ecSDave Kleikamp 207ac27a0ecSDave Kleikamp static inline int 208cc8e94fdSDarrick J. Wong ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) 209ac27a0ecSDave Kleikamp { 210cc8e94fdSDarrick J. Wong int error; 211cc8e94fdSDarrick J. Wong 212cc8e94fdSDarrick J. Wong if (buffer_verified(bh)) 213cc8e94fdSDarrick J. Wong return 0; 214cc8e94fdSDarrick J. Wong 215617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 216ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) 2176a797d27SDarrick J. Wong return -EFSCORRUPTED; 218dac7a4b4STheodore Ts'o if (!ext4_xattr_block_csum_verify(inode, bh)) 2196a797d27SDarrick J. Wong return -EFSBADCRC; 220a0626e75SDarrick J. Wong error = ext4_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size, 221a0626e75SDarrick J. Wong bh->b_data); 222cc8e94fdSDarrick J. Wong if (!error) 223cc8e94fdSDarrick J. Wong set_buffer_verified(bh); 224cc8e94fdSDarrick J. Wong return error; 225ac27a0ecSDave Kleikamp } 226ac27a0ecSDave Kleikamp 2279e92f48cSTheodore Ts'o static int 2289e92f48cSTheodore Ts'o __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, 2299e92f48cSTheodore Ts'o void *end, const char *function, unsigned int line) 2309e92f48cSTheodore Ts'o { 2319e92f48cSTheodore Ts'o int error = -EFSCORRUPTED; 2329e92f48cSTheodore Ts'o 233290ab230SEric Biggers if (end - (void *)header < sizeof(*header) + sizeof(u32) || 23419962509SEric Biggers (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) 2359e92f48cSTheodore Ts'o goto errout; 236290ab230SEric Biggers error = ext4_xattr_check_names(IFIRST(header), end, IFIRST(header)); 2379e92f48cSTheodore Ts'o errout: 2389e92f48cSTheodore Ts'o if (error) 2399e92f48cSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, 2409e92f48cSTheodore Ts'o "corrupted in-inode xattr"); 2419e92f48cSTheodore Ts'o return error; 2429e92f48cSTheodore Ts'o } 2439e92f48cSTheodore Ts'o 2449e92f48cSTheodore Ts'o #define xattr_check_inode(inode, header, end) \ 2459e92f48cSTheodore Ts'o __xattr_check_inode((inode), (header), (end), __func__, __LINE__) 2469e92f48cSTheodore Ts'o 247ac27a0ecSDave Kleikamp static inline int 248617ba13bSMingming Cao ext4_xattr_check_entry(struct ext4_xattr_entry *entry, size_t size) 249ac27a0ecSDave Kleikamp { 250ac27a0ecSDave Kleikamp size_t value_size = le32_to_cpu(entry->e_value_size); 251ac27a0ecSDave Kleikamp 252ac27a0ecSDave Kleikamp if (entry->e_value_block != 0 || value_size > size || 253ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs) + value_size > size) 2546a797d27SDarrick J. Wong return -EFSCORRUPTED; 255ac27a0ecSDave Kleikamp return 0; 256ac27a0ecSDave Kleikamp } 257ac27a0ecSDave Kleikamp 258ac27a0ecSDave Kleikamp static int 259617ba13bSMingming Cao ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, 260ac27a0ecSDave Kleikamp const char *name, size_t size, int sorted) 261ac27a0ecSDave Kleikamp { 262617ba13bSMingming Cao struct ext4_xattr_entry *entry; 263ac27a0ecSDave Kleikamp size_t name_len; 264ac27a0ecSDave Kleikamp int cmp = 1; 265ac27a0ecSDave Kleikamp 266ac27a0ecSDave Kleikamp if (name == NULL) 267ac27a0ecSDave Kleikamp return -EINVAL; 268ac27a0ecSDave Kleikamp name_len = strlen(name); 269ac27a0ecSDave Kleikamp entry = *pentry; 270617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 271ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 272ac27a0ecSDave Kleikamp if (!cmp) 273ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 274ac27a0ecSDave Kleikamp if (!cmp) 275ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 276ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 277ac27a0ecSDave Kleikamp break; 278ac27a0ecSDave Kleikamp } 279ac27a0ecSDave Kleikamp *pentry = entry; 280617ba13bSMingming Cao if (!cmp && ext4_xattr_check_entry(entry, size)) 2816a797d27SDarrick J. Wong return -EFSCORRUPTED; 282ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 283ac27a0ecSDave Kleikamp } 284ac27a0ecSDave Kleikamp 285ac27a0ecSDave Kleikamp static int 286617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 287ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 288ac27a0ecSDave Kleikamp { 289ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 290617ba13bSMingming Cao struct ext4_xattr_entry *entry; 291ac27a0ecSDave Kleikamp size_t size; 292ac27a0ecSDave Kleikamp int error; 2937a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 294ac27a0ecSDave Kleikamp 295ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 296ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 297ac27a0ecSDave Kleikamp 298ac27a0ecSDave Kleikamp error = -ENODATA; 299617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 300ac27a0ecSDave Kleikamp goto cleanup; 301ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 302ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 303617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 304ac27a0ecSDave Kleikamp if (!bh) 305ac27a0ecSDave Kleikamp goto cleanup; 306ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 307ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 308cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 30912062dddSEric Sandeen bad_block: 31024676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 311617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 3126a797d27SDarrick J. Wong error = -EFSCORRUPTED; 313ac27a0ecSDave Kleikamp goto cleanup; 314ac27a0ecSDave Kleikamp } 3159c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, bh); 316ac27a0ecSDave Kleikamp entry = BFIRST(bh); 317617ba13bSMingming Cao error = ext4_xattr_find_entry(&entry, name_index, name, bh->b_size, 1); 3186a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 319ac27a0ecSDave Kleikamp goto bad_block; 320ac27a0ecSDave Kleikamp if (error) 321ac27a0ecSDave Kleikamp goto cleanup; 322ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 323ac27a0ecSDave Kleikamp if (buffer) { 324ac27a0ecSDave Kleikamp error = -ERANGE; 325ac27a0ecSDave Kleikamp if (size > buffer_size) 326ac27a0ecSDave Kleikamp goto cleanup; 327ac27a0ecSDave Kleikamp memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs), 328ac27a0ecSDave Kleikamp size); 329ac27a0ecSDave Kleikamp } 330ac27a0ecSDave Kleikamp error = size; 331ac27a0ecSDave Kleikamp 332ac27a0ecSDave Kleikamp cleanup: 333ac27a0ecSDave Kleikamp brelse(bh); 334ac27a0ecSDave Kleikamp return error; 335ac27a0ecSDave Kleikamp } 336ac27a0ecSDave Kleikamp 337879b3825STao Ma int 338617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 339ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 340ac27a0ecSDave Kleikamp { 341617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 342617ba13bSMingming Cao struct ext4_xattr_entry *entry; 343617ba13bSMingming Cao struct ext4_inode *raw_inode; 344617ba13bSMingming Cao struct ext4_iloc iloc; 345ac27a0ecSDave Kleikamp size_t size; 346ac27a0ecSDave Kleikamp void *end; 347ac27a0ecSDave Kleikamp int error; 348ac27a0ecSDave Kleikamp 34919f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 350ac27a0ecSDave Kleikamp return -ENODATA; 351617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 352ac27a0ecSDave Kleikamp if (error) 353ac27a0ecSDave Kleikamp return error; 354617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 355ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 356ac27a0ecSDave Kleikamp entry = IFIRST(header); 357617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 3589e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 359ac27a0ecSDave Kleikamp if (error) 360ac27a0ecSDave Kleikamp goto cleanup; 361617ba13bSMingming Cao error = ext4_xattr_find_entry(&entry, name_index, name, 362ac27a0ecSDave Kleikamp end - (void *)entry, 0); 363ac27a0ecSDave Kleikamp if (error) 364ac27a0ecSDave Kleikamp goto cleanup; 365ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 366ac27a0ecSDave Kleikamp if (buffer) { 367ac27a0ecSDave Kleikamp error = -ERANGE; 368ac27a0ecSDave Kleikamp if (size > buffer_size) 369ac27a0ecSDave Kleikamp goto cleanup; 370ac27a0ecSDave Kleikamp memcpy(buffer, (void *)IFIRST(header) + 371ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs), size); 372ac27a0ecSDave Kleikamp } 373ac27a0ecSDave Kleikamp error = size; 374ac27a0ecSDave Kleikamp 375ac27a0ecSDave Kleikamp cleanup: 376ac27a0ecSDave Kleikamp brelse(iloc.bh); 377ac27a0ecSDave Kleikamp return error; 378ac27a0ecSDave Kleikamp } 379ac27a0ecSDave Kleikamp 380ac27a0ecSDave Kleikamp /* 381617ba13bSMingming Cao * ext4_xattr_get() 382ac27a0ecSDave Kleikamp * 383ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 384ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 385ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 386ac27a0ecSDave Kleikamp * 387ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 388ac27a0ecSDave Kleikamp * used / required on success. 389ac27a0ecSDave Kleikamp */ 390ac27a0ecSDave Kleikamp int 391617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 392ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 393ac27a0ecSDave Kleikamp { 394ac27a0ecSDave Kleikamp int error; 395ac27a0ecSDave Kleikamp 3960db1ff22STheodore Ts'o if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 3970db1ff22STheodore Ts'o return -EIO; 3980db1ff22STheodore Ts'o 399230b8c1aSZhang Zhen if (strlen(name) > 255) 400230b8c1aSZhang Zhen return -ERANGE; 401230b8c1aSZhang Zhen 402617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 403617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 404ac27a0ecSDave Kleikamp buffer_size); 405ac27a0ecSDave Kleikamp if (error == -ENODATA) 406617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 407ac27a0ecSDave Kleikamp buffer_size); 408617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 409ac27a0ecSDave Kleikamp return error; 410ac27a0ecSDave Kleikamp } 411ac27a0ecSDave Kleikamp 412ac27a0ecSDave Kleikamp static int 413431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 414ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 415ac27a0ecSDave Kleikamp { 416ac27a0ecSDave Kleikamp size_t rest = buffer_size; 417ac27a0ecSDave Kleikamp 418617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 41911e27528SStephen Hemminger const struct xattr_handler *handler = 420617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 421ac27a0ecSDave Kleikamp 422764a5c6bSAndreas Gruenbacher if (handler && (!handler->list || handler->list(dentry))) { 423764a5c6bSAndreas Gruenbacher const char *prefix = handler->prefix ?: handler->name; 424764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 425764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 426764a5c6bSAndreas Gruenbacher 427ac27a0ecSDave Kleikamp if (buffer) { 428ac27a0ecSDave Kleikamp if (size > rest) 429ac27a0ecSDave Kleikamp return -ERANGE; 430764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 431764a5c6bSAndreas Gruenbacher buffer += prefix_len; 432764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 433764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 434764a5c6bSAndreas Gruenbacher *buffer++ = 0; 435ac27a0ecSDave Kleikamp } 436ac27a0ecSDave Kleikamp rest -= size; 437ac27a0ecSDave Kleikamp } 438ac27a0ecSDave Kleikamp } 439764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 440ac27a0ecSDave Kleikamp } 441ac27a0ecSDave Kleikamp 442ac27a0ecSDave Kleikamp static int 443431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 444ac27a0ecSDave Kleikamp { 4452b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 446ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 447ac27a0ecSDave Kleikamp int error; 4487a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 449ac27a0ecSDave Kleikamp 450ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 451ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 452ac27a0ecSDave Kleikamp 453ac27a0ecSDave Kleikamp error = 0; 454617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 455ac27a0ecSDave Kleikamp goto cleanup; 456ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 457ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 458617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 459ac27a0ecSDave Kleikamp error = -EIO; 460ac27a0ecSDave Kleikamp if (!bh) 461ac27a0ecSDave Kleikamp goto cleanup; 462ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 463ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 464cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 46524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 466617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 4676a797d27SDarrick J. Wong error = -EFSCORRUPTED; 468ac27a0ecSDave Kleikamp goto cleanup; 469ac27a0ecSDave Kleikamp } 4709c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, bh); 471431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); 472ac27a0ecSDave Kleikamp 473ac27a0ecSDave Kleikamp cleanup: 474ac27a0ecSDave Kleikamp brelse(bh); 475ac27a0ecSDave Kleikamp 476ac27a0ecSDave Kleikamp return error; 477ac27a0ecSDave Kleikamp } 478ac27a0ecSDave Kleikamp 479ac27a0ecSDave Kleikamp static int 480431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 481ac27a0ecSDave Kleikamp { 4822b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 483617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 484617ba13bSMingming Cao struct ext4_inode *raw_inode; 485617ba13bSMingming Cao struct ext4_iloc iloc; 486ac27a0ecSDave Kleikamp void *end; 487ac27a0ecSDave Kleikamp int error; 488ac27a0ecSDave Kleikamp 48919f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 490ac27a0ecSDave Kleikamp return 0; 491617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 492ac27a0ecSDave Kleikamp if (error) 493ac27a0ecSDave Kleikamp return error; 494617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 495ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 496617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 4979e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 498ac27a0ecSDave Kleikamp if (error) 499ac27a0ecSDave Kleikamp goto cleanup; 500431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 501ac27a0ecSDave Kleikamp buffer, buffer_size); 502ac27a0ecSDave Kleikamp 503ac27a0ecSDave Kleikamp cleanup: 504ac27a0ecSDave Kleikamp brelse(iloc.bh); 505ac27a0ecSDave Kleikamp return error; 506ac27a0ecSDave Kleikamp } 507ac27a0ecSDave Kleikamp 508ac27a0ecSDave Kleikamp /* 509*ba7ea1d8SEric Biggers * Inode operation listxattr() 510*ba7ea1d8SEric Biggers * 511*ba7ea1d8SEric Biggers * d_inode(dentry)->i_rwsem: don't care 512ac27a0ecSDave Kleikamp * 513ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 514ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 515ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 516ac27a0ecSDave Kleikamp * 517ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 518ac27a0ecSDave Kleikamp * used / required on success. 519ac27a0ecSDave Kleikamp */ 520*ba7ea1d8SEric Biggers ssize_t 521*ba7ea1d8SEric Biggers ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) 522ac27a0ecSDave Kleikamp { 523eaeef867STheodore Ts'o int ret, ret2; 524ac27a0ecSDave Kleikamp 5252b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 526eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 527eaeef867STheodore Ts'o if (ret < 0) 528eaeef867STheodore Ts'o goto errout; 529ac27a0ecSDave Kleikamp if (buffer) { 530eaeef867STheodore Ts'o buffer += ret; 531eaeef867STheodore Ts'o buffer_size -= ret; 532ac27a0ecSDave Kleikamp } 533eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 534eaeef867STheodore Ts'o if (ret < 0) 535eaeef867STheodore Ts'o goto errout; 536eaeef867STheodore Ts'o ret += ret2; 537eaeef867STheodore Ts'o errout: 5382b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 539eaeef867STheodore Ts'o return ret; 540ac27a0ecSDave Kleikamp } 541ac27a0ecSDave Kleikamp 542ac27a0ecSDave Kleikamp /* 543617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 544ac27a0ecSDave Kleikamp * not set, set it. 545ac27a0ecSDave Kleikamp */ 546617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 547ac27a0ecSDave Kleikamp struct super_block *sb) 548ac27a0ecSDave Kleikamp { 549e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 550ac27a0ecSDave Kleikamp return; 551ac27a0ecSDave Kleikamp 5525d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 553617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 554e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 555a0375156STheodore Ts'o ext4_handle_dirty_super(handle, sb); 556ac27a0ecSDave Kleikamp } 557ac27a0ecSDave Kleikamp } 558ac27a0ecSDave Kleikamp 559ac27a0ecSDave Kleikamp /* 560ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 561ec4cb1aaSJan Kara * otherwise free the block. 562ac27a0ecSDave Kleikamp */ 563ac27a0ecSDave Kleikamp static void 564617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 565ac27a0ecSDave Kleikamp struct buffer_head *bh) 566ac27a0ecSDave Kleikamp { 5676048c64bSAndreas Gruenbacher struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 5686048c64bSAndreas Gruenbacher u32 hash, ref; 5698a2bfdcbSMingming Cao int error = 0; 570ac27a0ecSDave Kleikamp 5715d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 5728a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 5738a2bfdcbSMingming Cao if (error) 5748a2bfdcbSMingming Cao goto out; 5758a2bfdcbSMingming Cao 5768a2bfdcbSMingming Cao lock_buffer(bh); 5776048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 5786048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 5796048c64bSAndreas Gruenbacher if (ref == 1) { 580ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 58182939d79SJan Kara /* 58282939d79SJan Kara * This must happen under buffer lock for 58382939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 58482939d79SJan Kara */ 5856048c64bSAndreas Gruenbacher mb_cache_entry_delete_block(ext4_mb_cache, hash, bh->b_blocknr); 586ac27a0ecSDave Kleikamp get_bh(bh); 587ec4cb1aaSJan Kara unlock_buffer(bh); 588e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 589e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 590e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 591ac27a0ecSDave Kleikamp } else { 5926048c64bSAndreas Gruenbacher ref--; 5936048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 5946048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 5956048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 5966048c64bSAndreas Gruenbacher 5976048c64bSAndreas Gruenbacher ce = mb_cache_entry_get(ext4_mb_cache, hash, 5986048c64bSAndreas Gruenbacher bh->b_blocknr); 5996048c64bSAndreas Gruenbacher if (ce) { 6006048c64bSAndreas Gruenbacher ce->e_reusable = 1; 6016048c64bSAndreas Gruenbacher mb_cache_entry_put(ext4_mb_cache, ce); 6026048c64bSAndreas Gruenbacher } 6036048c64bSAndreas Gruenbacher } 6046048c64bSAndreas Gruenbacher 605dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bh); 606ec4cb1aaSJan Kara /* 607ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 608ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 609ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 610ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 611ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 612dac7a4b4STheodore Ts'o * call ext4_handle_dirty_metadata() with locked buffer as 613ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 614ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 615ec4cb1aaSJan Kara */ 616ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 617dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 618c1bb05a6SEric Sandeen unlock_buffer(bh); 619ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 620dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 621ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 6220390131bSFrank Mayhar ext4_handle_sync(handle); 6231231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 624ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 625ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 626ac27a0ecSDave Kleikamp } 6278a2bfdcbSMingming Cao out: 6288a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 6298a2bfdcbSMingming Cao return; 630ac27a0ecSDave Kleikamp } 631ac27a0ecSDave Kleikamp 6326dd4ee7cSKalpak Shah /* 6336dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 6346dd4ee7cSKalpak Shah * bytes used by EA entries. 6356dd4ee7cSKalpak Shah */ 6366dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 6376dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 6386dd4ee7cSKalpak Shah { 6396dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 6401cba4237SJan Kara if (last->e_value_size) { 6416dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 6426dd4ee7cSKalpak Shah if (offs < *min_offs) 6436dd4ee7cSKalpak Shah *min_offs = offs; 6446dd4ee7cSKalpak Shah } 6457b1b2c1bSTheodore Ts'o if (total) 6467b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 6476dd4ee7cSKalpak Shah } 6486dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 6496dd4ee7cSKalpak Shah } 6506dd4ee7cSKalpak Shah 651ac27a0ecSDave Kleikamp static int 652617ba13bSMingming Cao ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s) 653ac27a0ecSDave Kleikamp { 654617ba13bSMingming Cao struct ext4_xattr_entry *last; 655ac27a0ecSDave Kleikamp size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); 656ac27a0ecSDave Kleikamp 657ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 658ac27a0ecSDave Kleikamp last = s->first; 659617ba13bSMingming Cao for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 6601cba4237SJan Kara if (last->e_value_size) { 661ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 662ac27a0ecSDave Kleikamp if (offs < min_offs) 663ac27a0ecSDave Kleikamp min_offs = offs; 664ac27a0ecSDave Kleikamp } 665ac27a0ecSDave Kleikamp } 666ac27a0ecSDave Kleikamp free = min_offs - ((void *)last - s->base) - sizeof(__u32); 667ac27a0ecSDave Kleikamp if (!s->not_found) { 6681cba4237SJan Kara if (s->here->e_value_size) { 669ac27a0ecSDave Kleikamp size_t size = le32_to_cpu(s->here->e_value_size); 670617ba13bSMingming Cao free += EXT4_XATTR_SIZE(size); 671ac27a0ecSDave Kleikamp } 672617ba13bSMingming Cao free += EXT4_XATTR_LEN(name_len); 673ac27a0ecSDave Kleikamp } 674ac27a0ecSDave Kleikamp if (i->value) { 6755f80f62aSWei Yuan if (free < EXT4_XATTR_LEN(name_len) + 676617ba13bSMingming Cao EXT4_XATTR_SIZE(i->value_len)) 677ac27a0ecSDave Kleikamp return -ENOSPC; 678ac27a0ecSDave Kleikamp } 679ac27a0ecSDave Kleikamp 680ac27a0ecSDave Kleikamp if (i->value && s->not_found) { 681ac27a0ecSDave Kleikamp /* Insert the new name. */ 682617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 683ac27a0ecSDave Kleikamp size_t rest = (void *)last - (void *)s->here + sizeof(__u32); 684ac27a0ecSDave Kleikamp memmove((void *)s->here + size, s->here, rest); 685ac27a0ecSDave Kleikamp memset(s->here, 0, size); 686ac27a0ecSDave Kleikamp s->here->e_name_index = i->name_index; 687ac27a0ecSDave Kleikamp s->here->e_name_len = name_len; 688ac27a0ecSDave Kleikamp memcpy(s->here->e_name, i->name, name_len); 689ac27a0ecSDave Kleikamp } else { 6901cba4237SJan Kara if (s->here->e_value_size) { 691ac27a0ecSDave Kleikamp void *first_val = s->base + min_offs; 692ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(s->here->e_value_offs); 693ac27a0ecSDave Kleikamp void *val = s->base + offs; 694617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE( 695ac27a0ecSDave Kleikamp le32_to_cpu(s->here->e_value_size)); 696ac27a0ecSDave Kleikamp 697617ba13bSMingming Cao if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { 698ac27a0ecSDave Kleikamp /* The old and the new value have the same 699ac27a0ecSDave Kleikamp size. Just replace. */ 700ac27a0ecSDave Kleikamp s->here->e_value_size = 701ac27a0ecSDave Kleikamp cpu_to_le32(i->value_len); 702bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 703bd9926e8STheodore Ts'o memset(val, 0, size); 704bd9926e8STheodore Ts'o } else { 705bd9926e8STheodore Ts'o /* Clear pad bytes first. */ 706617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 707bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 708ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 709bd9926e8STheodore Ts'o } 710ac27a0ecSDave Kleikamp return 0; 711ac27a0ecSDave Kleikamp } 712ac27a0ecSDave Kleikamp 713ac27a0ecSDave Kleikamp /* Remove the old value. */ 714ac27a0ecSDave Kleikamp memmove(first_val + size, first_val, val - first_val); 715ac27a0ecSDave Kleikamp memset(first_val, 0, size); 716ac27a0ecSDave Kleikamp s->here->e_value_size = 0; 717ac27a0ecSDave Kleikamp s->here->e_value_offs = 0; 718ac27a0ecSDave Kleikamp min_offs += size; 719ac27a0ecSDave Kleikamp 720ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 721ac27a0ecSDave Kleikamp last = s->first; 722ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 723ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 7241cba4237SJan Kara if (last->e_value_size && o < offs) 725ac27a0ecSDave Kleikamp last->e_value_offs = 726ac27a0ecSDave Kleikamp cpu_to_le16(o + size); 727617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 728ac27a0ecSDave Kleikamp } 729ac27a0ecSDave Kleikamp } 730ac27a0ecSDave Kleikamp if (!i->value) { 731ac27a0ecSDave Kleikamp /* Remove the old name. */ 732617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 733ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 734ac27a0ecSDave Kleikamp memmove(s->here, (void *)s->here + size, 735ac27a0ecSDave Kleikamp (void *)last - (void *)s->here + sizeof(__u32)); 736ac27a0ecSDave Kleikamp memset(last, 0, size); 737ac27a0ecSDave Kleikamp } 738ac27a0ecSDave Kleikamp } 739ac27a0ecSDave Kleikamp 740ac27a0ecSDave Kleikamp if (i->value) { 741ac27a0ecSDave Kleikamp /* Insert the new value. */ 742ac27a0ecSDave Kleikamp s->here->e_value_size = cpu_to_le32(i->value_len); 743ac27a0ecSDave Kleikamp if (i->value_len) { 744617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE(i->value_len); 745ac27a0ecSDave Kleikamp void *val = s->base + min_offs - size; 746ac27a0ecSDave Kleikamp s->here->e_value_offs = cpu_to_le16(min_offs - size); 747bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 748bd9926e8STheodore Ts'o memset(val, 0, size); 749bd9926e8STheodore Ts'o } else { 750bd9926e8STheodore Ts'o /* Clear the pad bytes first. */ 751617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 752bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 753ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 754ac27a0ecSDave Kleikamp } 755ac27a0ecSDave Kleikamp } 756bd9926e8STheodore Ts'o } 757ac27a0ecSDave Kleikamp return 0; 758ac27a0ecSDave Kleikamp } 759ac27a0ecSDave Kleikamp 760617ba13bSMingming Cao struct ext4_xattr_block_find { 761617ba13bSMingming Cao struct ext4_xattr_search s; 762ac27a0ecSDave Kleikamp struct buffer_head *bh; 763ac27a0ecSDave Kleikamp }; 764ac27a0ecSDave Kleikamp 765ac27a0ecSDave Kleikamp static int 766617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 767617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 768ac27a0ecSDave Kleikamp { 769ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 770ac27a0ecSDave Kleikamp int error; 771ac27a0ecSDave Kleikamp 772ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 773ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 774ac27a0ecSDave Kleikamp 775617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 776ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 777617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 778ac27a0ecSDave Kleikamp error = -EIO; 779ac27a0ecSDave Kleikamp if (!bs->bh) 780ac27a0ecSDave Kleikamp goto cleanup; 781ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 782ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 783ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 784cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bs->bh)) { 78524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 78624676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 7876a797d27SDarrick J. Wong error = -EFSCORRUPTED; 788ac27a0ecSDave Kleikamp goto cleanup; 789ac27a0ecSDave Kleikamp } 790ac27a0ecSDave Kleikamp /* Find the named attribute. */ 791ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 792ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 793ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 794ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 795617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 796ac27a0ecSDave Kleikamp i->name, bs->bh->b_size, 1); 797ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 798ac27a0ecSDave Kleikamp goto cleanup; 799ac27a0ecSDave Kleikamp bs->s.not_found = error; 800ac27a0ecSDave Kleikamp } 801ac27a0ecSDave Kleikamp error = 0; 802ac27a0ecSDave Kleikamp 803ac27a0ecSDave Kleikamp cleanup: 804ac27a0ecSDave Kleikamp return error; 805ac27a0ecSDave Kleikamp } 806ac27a0ecSDave Kleikamp 807ac27a0ecSDave Kleikamp static int 808617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 809617ba13bSMingming Cao struct ext4_xattr_info *i, 810617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 811ac27a0ecSDave Kleikamp { 812ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 813ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 814617ba13bSMingming Cao struct ext4_xattr_search *s = &bs->s; 8157a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 8168a2bfdcbSMingming Cao int error = 0; 8177a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 818ac27a0ecSDave Kleikamp 819617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 820ac27a0ecSDave Kleikamp 821ac27a0ecSDave Kleikamp if (i->value && i->value_len > sb->s_blocksize) 822ac27a0ecSDave Kleikamp return -ENOSPC; 823ac27a0ecSDave Kleikamp if (s->base) { 8245d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 8258a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 8268a2bfdcbSMingming Cao if (error) 8278a2bfdcbSMingming Cao goto cleanup; 8288a2bfdcbSMingming Cao lock_buffer(bs->bh); 8298a2bfdcbSMingming Cao 830ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 83182939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 83282939d79SJan Kara 83382939d79SJan Kara /* 83482939d79SJan Kara * This must happen under buffer lock for 83582939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 83682939d79SJan Kara * block 83782939d79SJan Kara */ 8387a2508e1SJan Kara mb_cache_entry_delete_block(ext4_mb_cache, hash, 83982939d79SJan Kara bs->bh->b_blocknr); 840ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 841617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 842ac27a0ecSDave Kleikamp if (!error) { 843ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 844617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), 845ac27a0ecSDave Kleikamp s->here); 8469c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, 8479c191f70ST Makphaibulchoke bs->bh); 848ac27a0ecSDave Kleikamp } 849dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bs->bh); 850ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 8516a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 852ac27a0ecSDave Kleikamp goto bad_block; 853ac27a0ecSDave Kleikamp if (!error) 854dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 8550390131bSFrank Mayhar inode, 856ac27a0ecSDave Kleikamp bs->bh); 857ac27a0ecSDave Kleikamp if (error) 858ac27a0ecSDave Kleikamp goto cleanup; 859ac27a0ecSDave Kleikamp goto inserted; 860ac27a0ecSDave Kleikamp } else { 861ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 862ac27a0ecSDave Kleikamp 8638a2bfdcbSMingming Cao unlock_buffer(bs->bh); 864ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 865216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 866ac27a0ecSDave Kleikamp error = -ENOMEM; 867ac27a0ecSDave Kleikamp if (s->base == NULL) 868ac27a0ecSDave Kleikamp goto cleanup; 869ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 870ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 871ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 872ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 873ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 874ac27a0ecSDave Kleikamp } 875ac27a0ecSDave Kleikamp } else { 876ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 877216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 878ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 879ac27a0ecSDave Kleikamp error = -ENOMEM; 880ac27a0ecSDave Kleikamp if (s->base == NULL) 881ac27a0ecSDave Kleikamp goto cleanup; 882617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 883ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 884ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 885ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 886ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 887ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 888ac27a0ecSDave Kleikamp } 889ac27a0ecSDave Kleikamp 890617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 8916a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 892ac27a0ecSDave Kleikamp goto bad_block; 893ac27a0ecSDave Kleikamp if (error) 894ac27a0ecSDave Kleikamp goto cleanup; 895ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 896617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), s->here); 897ac27a0ecSDave Kleikamp 898ac27a0ecSDave Kleikamp inserted: 899ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 900617ba13bSMingming Cao new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); 901ac27a0ecSDave Kleikamp if (new_bh) { 902ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 903ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 904ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 905ac27a0ecSDave Kleikamp else { 9066048c64bSAndreas Gruenbacher u32 ref; 9076048c64bSAndreas Gruenbacher 908ac27a0ecSDave Kleikamp /* The old block is released after updating 909ac27a0ecSDave Kleikamp the inode. */ 9101231b3a1SLukas Czerner error = dquot_alloc_block(inode, 9111231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 9125dd4056dSChristoph Hellwig if (error) 913ac27a0ecSDave Kleikamp goto cleanup; 9145d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 915617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 916ac27a0ecSDave Kleikamp new_bh); 917ac27a0ecSDave Kleikamp if (error) 918ac27a0ecSDave Kleikamp goto cleanup_dquot; 919ac27a0ecSDave Kleikamp lock_buffer(new_bh); 92082939d79SJan Kara /* 92182939d79SJan Kara * We have to be careful about races with 9226048c64bSAndreas Gruenbacher * freeing, rehashing or adding references to 9236048c64bSAndreas Gruenbacher * xattr block. Once we hold buffer lock xattr 9246048c64bSAndreas Gruenbacher * block's state is stable so we can check 9256048c64bSAndreas Gruenbacher * whether the block got freed / rehashed or 9266048c64bSAndreas Gruenbacher * not. Since we unhash mbcache entry under 9276048c64bSAndreas Gruenbacher * buffer lock when freeing / rehashing xattr 9286048c64bSAndreas Gruenbacher * block, checking whether entry is still 9296048c64bSAndreas Gruenbacher * hashed is reliable. Same rules hold for 9306048c64bSAndreas Gruenbacher * e_reusable handling. 93182939d79SJan Kara */ 9326048c64bSAndreas Gruenbacher if (hlist_bl_unhashed(&ce->e_hash_list) || 9336048c64bSAndreas Gruenbacher !ce->e_reusable) { 93482939d79SJan Kara /* 93582939d79SJan Kara * Undo everything and check mbcache 93682939d79SJan Kara * again. 93782939d79SJan Kara */ 93882939d79SJan Kara unlock_buffer(new_bh); 93982939d79SJan Kara dquot_free_block(inode, 94082939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 94182939d79SJan Kara 1)); 94282939d79SJan Kara brelse(new_bh); 9437a2508e1SJan Kara mb_cache_entry_put(ext4_mb_cache, ce); 94482939d79SJan Kara ce = NULL; 94582939d79SJan Kara new_bh = NULL; 94682939d79SJan Kara goto inserted; 94782939d79SJan Kara } 9486048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 9496048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 9506048c64bSAndreas Gruenbacher if (ref >= EXT4_XATTR_REFCOUNT_MAX) 9516048c64bSAndreas Gruenbacher ce->e_reusable = 0; 952ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 9536048c64bSAndreas Gruenbacher ref); 954dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 955ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 956dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 9570390131bSFrank Mayhar inode, 958ac27a0ecSDave Kleikamp new_bh); 959ac27a0ecSDave Kleikamp if (error) 960ac27a0ecSDave Kleikamp goto cleanup_dquot; 961ac27a0ecSDave Kleikamp } 9627a2508e1SJan Kara mb_cache_entry_touch(ext4_mb_cache, ce); 9637a2508e1SJan Kara mb_cache_entry_put(ext4_mb_cache, ce); 964ac27a0ecSDave Kleikamp ce = NULL; 965ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 966ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 967ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 968ac27a0ecSDave Kleikamp new_bh = bs->bh; 969ac27a0ecSDave Kleikamp get_bh(new_bh); 970ac27a0ecSDave Kleikamp } else { 971ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 972fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 973fb0a387dSEric Sandeen 974fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 975d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 976fb0a387dSEric Sandeen 977fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 97812e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 979fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 980fb0a387dSEric Sandeen 98155f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 98255f020dbSAllison Henderson NULL, &error); 983ac27a0ecSDave Kleikamp if (error) 984ac27a0ecSDave Kleikamp goto cleanup; 985fb0a387dSEric Sandeen 98612e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 987fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 988fb0a387dSEric Sandeen 989ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 990ace36ad4SJoe Perches (unsigned long long)block); 991ac27a0ecSDave Kleikamp 992ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 993aebf0243SWang Shilong if (unlikely(!new_bh)) { 994860d21e2STheodore Ts'o error = -ENOMEM; 995ac27a0ecSDave Kleikamp getblk_failed: 9967dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 997e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 998ac27a0ecSDave Kleikamp goto cleanup; 999ac27a0ecSDave Kleikamp } 1000ac27a0ecSDave Kleikamp lock_buffer(new_bh); 1001617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 1002ac27a0ecSDave Kleikamp if (error) { 1003ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 1004860d21e2STheodore Ts'o error = -EIO; 1005ac27a0ecSDave Kleikamp goto getblk_failed; 1006ac27a0ecSDave Kleikamp } 1007ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 1008dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 1009ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 1010ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 10119c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, new_bh); 1012dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, 1013dac7a4b4STheodore Ts'o new_bh); 1014ac27a0ecSDave Kleikamp if (error) 1015ac27a0ecSDave Kleikamp goto cleanup; 1016ac27a0ecSDave Kleikamp } 1017ac27a0ecSDave Kleikamp } 1018ac27a0ecSDave Kleikamp 1019ac27a0ecSDave Kleikamp /* Update the inode. */ 1020617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 1021ac27a0ecSDave Kleikamp 1022ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 1023ac27a0ecSDave Kleikamp if (bs->bh && bs->bh != new_bh) 1024617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bs->bh); 1025ac27a0ecSDave Kleikamp error = 0; 1026ac27a0ecSDave Kleikamp 1027ac27a0ecSDave Kleikamp cleanup: 1028ac27a0ecSDave Kleikamp if (ce) 10297a2508e1SJan Kara mb_cache_entry_put(ext4_mb_cache, ce); 1030ac27a0ecSDave Kleikamp brelse(new_bh); 1031ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 1032ac27a0ecSDave Kleikamp kfree(s->base); 1033ac27a0ecSDave Kleikamp 1034ac27a0ecSDave Kleikamp return error; 1035ac27a0ecSDave Kleikamp 1036ac27a0ecSDave Kleikamp cleanup_dquot: 10371231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 1038ac27a0ecSDave Kleikamp goto cleanup; 1039ac27a0ecSDave Kleikamp 1040ac27a0ecSDave Kleikamp bad_block: 104124676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 104224676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1043ac27a0ecSDave Kleikamp goto cleanup; 1044ac27a0ecSDave Kleikamp 1045ac27a0ecSDave Kleikamp #undef header 1046ac27a0ecSDave Kleikamp } 1047ac27a0ecSDave Kleikamp 1048879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 1049617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 1050ac27a0ecSDave Kleikamp { 1051617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 1052617ba13bSMingming Cao struct ext4_inode *raw_inode; 1053ac27a0ecSDave Kleikamp int error; 1054ac27a0ecSDave Kleikamp 1055617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 1056ac27a0ecSDave Kleikamp return 0; 1057617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 1058ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 1059ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 1060ac27a0ecSDave Kleikamp is->s.here = is->s.first; 1061617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 106219f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 10639e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 1064ac27a0ecSDave Kleikamp if (error) 1065ac27a0ecSDave Kleikamp return error; 1066ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1067617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 1068ac27a0ecSDave Kleikamp i->name, is->s.end - 1069ac27a0ecSDave Kleikamp (void *)is->s.base, 0); 1070ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1071ac27a0ecSDave Kleikamp return error; 1072ac27a0ecSDave Kleikamp is->s.not_found = error; 1073ac27a0ecSDave Kleikamp } 1074ac27a0ecSDave Kleikamp return 0; 1075ac27a0ecSDave Kleikamp } 1076ac27a0ecSDave Kleikamp 10770d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 10780d812f77STao Ma struct ext4_xattr_info *i, 10790d812f77STao Ma struct ext4_xattr_ibody_find *is) 10800d812f77STao Ma { 10810d812f77STao Ma struct ext4_xattr_ibody_header *header; 10820d812f77STao Ma struct ext4_xattr_search *s = &is->s; 10830d812f77STao Ma int error; 10840d812f77STao Ma 10850d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 10860d812f77STao Ma return -ENOSPC; 10870d812f77STao Ma error = ext4_xattr_set_entry(i, s); 10880d812f77STao Ma if (error) { 10890d812f77STao Ma if (error == -ENOSPC && 10900d812f77STao Ma ext4_has_inline_data(inode)) { 10910d812f77STao Ma error = ext4_try_to_evict_inline_data(handle, inode, 10920d812f77STao Ma EXT4_XATTR_LEN(strlen(i->name) + 10930d812f77STao Ma EXT4_XATTR_SIZE(i->value_len))); 10940d812f77STao Ma if (error) 10950d812f77STao Ma return error; 10960d812f77STao Ma error = ext4_xattr_ibody_find(inode, i, is); 10970d812f77STao Ma if (error) 10980d812f77STao Ma return error; 10990d812f77STao Ma error = ext4_xattr_set_entry(i, s); 11000d812f77STao Ma } 11010d812f77STao Ma if (error) 11020d812f77STao Ma return error; 11030d812f77STao Ma } 11040d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 11050d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 11060d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 11070d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 11080d812f77STao Ma } else { 11090d812f77STao Ma header->h_magic = cpu_to_le32(0); 11100d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 11110d812f77STao Ma } 11120d812f77STao Ma return 0; 11130d812f77STao Ma } 11140d812f77STao Ma 1115d5c8dab6SEric Whitney static int ext4_xattr_ibody_set(struct inode *inode, 1116617ba13bSMingming Cao struct ext4_xattr_info *i, 1117617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 1118ac27a0ecSDave Kleikamp { 1119617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 1120617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 1121ac27a0ecSDave Kleikamp int error; 1122ac27a0ecSDave Kleikamp 1123617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 1124ac27a0ecSDave Kleikamp return -ENOSPC; 1125617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 1126ac27a0ecSDave Kleikamp if (error) 1127ac27a0ecSDave Kleikamp return error; 1128617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 1129ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 1130617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 113119f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 1132ac27a0ecSDave Kleikamp } else { 1133ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 113419f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 1135ac27a0ecSDave Kleikamp } 1136ac27a0ecSDave Kleikamp return 0; 1137ac27a0ecSDave Kleikamp } 1138ac27a0ecSDave Kleikamp 11393fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 11403fd16462SJan Kara struct ext4_xattr_info *i) 11413fd16462SJan Kara { 11423fd16462SJan Kara void *value; 11433fd16462SJan Kara 11443fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 11453fd16462SJan Kara return 0; 11463fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 11473fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 11483fd16462SJan Kara } 11493fd16462SJan Kara 1150ac27a0ecSDave Kleikamp /* 1151617ba13bSMingming Cao * ext4_xattr_set_handle() 1152ac27a0ecSDave Kleikamp * 11536e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 1154ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 1155ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 1156ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 1157ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 1158ac27a0ecSDave Kleikamp * previous to the call, respectively. 1159ac27a0ecSDave Kleikamp * 1160ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1161ac27a0ecSDave Kleikamp */ 1162ac27a0ecSDave Kleikamp int 1163617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 1164ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 1165ac27a0ecSDave Kleikamp int flags) 1166ac27a0ecSDave Kleikamp { 1167617ba13bSMingming Cao struct ext4_xattr_info i = { 1168ac27a0ecSDave Kleikamp .name_index = name_index, 1169ac27a0ecSDave Kleikamp .name = name, 1170ac27a0ecSDave Kleikamp .value = value, 1171ac27a0ecSDave Kleikamp .value_len = value_len, 1172ac27a0ecSDave Kleikamp 1173ac27a0ecSDave Kleikamp }; 1174617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 1175ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1176ac27a0ecSDave Kleikamp }; 1177617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 1178ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1179ac27a0ecSDave Kleikamp }; 1180c755e251STheodore Ts'o int no_expand; 1181ac27a0ecSDave Kleikamp int error; 1182ac27a0ecSDave Kleikamp 1183ac27a0ecSDave Kleikamp if (!name) 1184ac27a0ecSDave Kleikamp return -EINVAL; 1185ac27a0ecSDave Kleikamp if (strlen(name) > 255) 1186ac27a0ecSDave Kleikamp return -ERANGE; 1187c755e251STheodore Ts'o ext4_write_lock_xattr(inode, &no_expand); 11884d20c685SKalpak Shah 118966543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 119086ebfd08SEric Sandeen if (error) 119186ebfd08SEric Sandeen goto cleanup; 119286ebfd08SEric Sandeen 119319f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 1194617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 1195617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 119619f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 1197ac27a0ecSDave Kleikamp } 1198ac27a0ecSDave Kleikamp 1199617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 1200ac27a0ecSDave Kleikamp if (error) 1201ac27a0ecSDave Kleikamp goto cleanup; 1202ac27a0ecSDave Kleikamp if (is.s.not_found) 1203617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 1204ac27a0ecSDave Kleikamp if (error) 1205ac27a0ecSDave Kleikamp goto cleanup; 1206ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 1207ac27a0ecSDave Kleikamp error = -ENODATA; 1208ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 1209ac27a0ecSDave Kleikamp goto cleanup; 1210ac27a0ecSDave Kleikamp error = 0; 1211ac27a0ecSDave Kleikamp if (!value) 1212ac27a0ecSDave Kleikamp goto cleanup; 1213ac27a0ecSDave Kleikamp } else { 1214ac27a0ecSDave Kleikamp error = -EEXIST; 1215ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 1216ac27a0ecSDave Kleikamp goto cleanup; 1217ac27a0ecSDave Kleikamp } 1218ac27a0ecSDave Kleikamp if (!value) { 1219ac27a0ecSDave Kleikamp if (!is.s.not_found) 1220d5c8dab6SEric Whitney error = ext4_xattr_ibody_set(inode, &i, &is); 1221ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 1222617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1223ac27a0ecSDave Kleikamp } else { 12243fd16462SJan Kara error = 0; 12253fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 12263fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 12273fd16462SJan Kara goto cleanup; 12283fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 12293fd16462SJan Kara goto cleanup; 12303fd16462SJan Kara 1231d5c8dab6SEric Whitney error = ext4_xattr_ibody_set(inode, &i, &is); 1232ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 1233ac27a0ecSDave Kleikamp i.value = NULL; 1234617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1235ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 12367e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 12377e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 12387e01c8e5STiger Yang if (error) 12397e01c8e5STiger Yang goto cleanup; 12407e01c8e5STiger Yang } 1241617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1242ac27a0ecSDave Kleikamp if (error) 1243ac27a0ecSDave Kleikamp goto cleanup; 1244ac27a0ecSDave Kleikamp if (!is.s.not_found) { 1245ac27a0ecSDave Kleikamp i.value = NULL; 1246d5c8dab6SEric Whitney error = ext4_xattr_ibody_set(inode, &i, &is); 1247ac27a0ecSDave Kleikamp } 1248ac27a0ecSDave Kleikamp } 1249ac27a0ecSDave Kleikamp } 1250ac27a0ecSDave Kleikamp if (!error) { 1251617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 1252eeca7ea1SDeepa Dinamani inode->i_ctime = current_time(inode); 12536dd4ee7cSKalpak Shah if (!value) 1254c755e251STheodore Ts'o no_expand = 0; 1255617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 1256ac27a0ecSDave Kleikamp /* 1257617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 1258ac27a0ecSDave Kleikamp * error != 0. 1259ac27a0ecSDave Kleikamp */ 1260ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 1261ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 12620390131bSFrank Mayhar ext4_handle_sync(handle); 1263ac27a0ecSDave Kleikamp } 1264ac27a0ecSDave Kleikamp 1265ac27a0ecSDave Kleikamp cleanup: 1266ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 1267ac27a0ecSDave Kleikamp brelse(bs.bh); 1268c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 1269ac27a0ecSDave Kleikamp return error; 1270ac27a0ecSDave Kleikamp } 1271ac27a0ecSDave Kleikamp 1272ac27a0ecSDave Kleikamp /* 1273617ba13bSMingming Cao * ext4_xattr_set() 1274ac27a0ecSDave Kleikamp * 1275617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 1276ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 1277ac27a0ecSDave Kleikamp * 1278ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1279ac27a0ecSDave Kleikamp */ 1280ac27a0ecSDave Kleikamp int 1281617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 1282ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 1283ac27a0ecSDave Kleikamp { 1284ac27a0ecSDave Kleikamp handle_t *handle; 1285ac27a0ecSDave Kleikamp int error, retries = 0; 128695eaefbdSTheodore Ts'o int credits = ext4_jbd2_credits_xattr(inode); 1287ac27a0ecSDave Kleikamp 1288ac27a0ecSDave Kleikamp retry: 12899924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 1290ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 1291ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 1292ac27a0ecSDave Kleikamp } else { 1293ac27a0ecSDave Kleikamp int error2; 1294ac27a0ecSDave Kleikamp 1295617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 1296ac27a0ecSDave Kleikamp value, value_len, flags); 1297617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 1298ac27a0ecSDave Kleikamp if (error == -ENOSPC && 1299617ba13bSMingming Cao ext4_should_retry_alloc(inode->i_sb, &retries)) 1300ac27a0ecSDave Kleikamp goto retry; 1301ac27a0ecSDave Kleikamp if (error == 0) 1302ac27a0ecSDave Kleikamp error = error2; 1303ac27a0ecSDave Kleikamp } 1304ac27a0ecSDave Kleikamp 1305ac27a0ecSDave Kleikamp return error; 1306ac27a0ecSDave Kleikamp } 1307ac27a0ecSDave Kleikamp 1308ac27a0ecSDave Kleikamp /* 13096dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 13106dd4ee7cSKalpak Shah * i_extra_isize. 13116dd4ee7cSKalpak Shah */ 13126dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 13136dd4ee7cSKalpak Shah int value_offs_shift, void *to, 131494405713SJan Kara void *from, size_t n) 13156dd4ee7cSKalpak Shah { 13166dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 13176dd4ee7cSKalpak Shah int new_offs; 13186dd4ee7cSKalpak Shah 131994405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 132094405713SJan Kara BUG_ON(value_offs_shift > 0); 132194405713SJan Kara 13226dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 13236dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 13241cba4237SJan Kara if (last->e_value_size) { 13256dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 13266dd4ee7cSKalpak Shah value_offs_shift; 13276dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 13286dd4ee7cSKalpak Shah } 13296dd4ee7cSKalpak Shah } 13306dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 13316dd4ee7cSKalpak Shah memmove(to, from, n); 13326dd4ee7cSKalpak Shah } 13336dd4ee7cSKalpak Shah 13346dd4ee7cSKalpak Shah /* 13353f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 13363f2571c1SJan Kara */ 13373f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 13383f2571c1SJan Kara struct ext4_inode *raw_inode, 13393f2571c1SJan Kara struct ext4_xattr_entry *entry) 13403f2571c1SJan Kara { 13413f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 13423f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 13433f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 13443f2571c1SJan Kara size_t value_offs, value_size; 13453f2571c1SJan Kara struct ext4_xattr_info i = { 13463f2571c1SJan Kara .value = NULL, 13473f2571c1SJan Kara .value_len = 0, 13483f2571c1SJan Kara .name_index = entry->e_name_index, 13493f2571c1SJan Kara }; 13503f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 13513f2571c1SJan Kara int error; 13523f2571c1SJan Kara 13533f2571c1SJan Kara value_offs = le16_to_cpu(entry->e_value_offs); 13543f2571c1SJan Kara value_size = le32_to_cpu(entry->e_value_size); 13553f2571c1SJan Kara 13563f2571c1SJan Kara is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 13573f2571c1SJan Kara bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 13583f2571c1SJan Kara buffer = kmalloc(value_size, GFP_NOFS); 13593f2571c1SJan Kara b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 13603f2571c1SJan Kara if (!is || !bs || !buffer || !b_entry_name) { 13613f2571c1SJan Kara error = -ENOMEM; 13623f2571c1SJan Kara goto out; 13633f2571c1SJan Kara } 13643f2571c1SJan Kara 13653f2571c1SJan Kara is->s.not_found = -ENODATA; 13663f2571c1SJan Kara bs->s.not_found = -ENODATA; 13673f2571c1SJan Kara is->iloc.bh = NULL; 13683f2571c1SJan Kara bs->bh = NULL; 13693f2571c1SJan Kara 13703f2571c1SJan Kara /* Save the entry name and the entry value */ 13713f2571c1SJan Kara memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); 13723f2571c1SJan Kara memcpy(b_entry_name, entry->e_name, entry->e_name_len); 13733f2571c1SJan Kara b_entry_name[entry->e_name_len] = '\0'; 13743f2571c1SJan Kara i.name = b_entry_name; 13753f2571c1SJan Kara 13763f2571c1SJan Kara error = ext4_get_inode_loc(inode, &is->iloc); 13773f2571c1SJan Kara if (error) 13783f2571c1SJan Kara goto out; 13793f2571c1SJan Kara 13803f2571c1SJan Kara error = ext4_xattr_ibody_find(inode, &i, is); 13813f2571c1SJan Kara if (error) 13823f2571c1SJan Kara goto out; 13833f2571c1SJan Kara 13843f2571c1SJan Kara /* Remove the chosen entry from the inode */ 1385d5c8dab6SEric Whitney error = ext4_xattr_ibody_set(inode, &i, is); 13863f2571c1SJan Kara if (error) 13873f2571c1SJan Kara goto out; 13883f2571c1SJan Kara 13893f2571c1SJan Kara i.name = b_entry_name; 13903f2571c1SJan Kara i.value = buffer; 13913f2571c1SJan Kara i.value_len = value_size; 13923f2571c1SJan Kara error = ext4_xattr_block_find(inode, &i, bs); 13933f2571c1SJan Kara if (error) 13943f2571c1SJan Kara goto out; 13953f2571c1SJan Kara 13963f2571c1SJan Kara /* Add entry which was removed from the inode into the block */ 13973f2571c1SJan Kara error = ext4_xattr_block_set(handle, inode, &i, bs); 13983f2571c1SJan Kara if (error) 13993f2571c1SJan Kara goto out; 14003f2571c1SJan Kara error = 0; 14013f2571c1SJan Kara out: 14023f2571c1SJan Kara kfree(b_entry_name); 14033f2571c1SJan Kara kfree(buffer); 14043f2571c1SJan Kara if (is) 14053f2571c1SJan Kara brelse(is->iloc.bh); 14063f2571c1SJan Kara kfree(is); 14073f2571c1SJan Kara kfree(bs); 14083f2571c1SJan Kara 14093f2571c1SJan Kara return error; 14103f2571c1SJan Kara } 14113f2571c1SJan Kara 1412dfa2064bSJan Kara static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, 1413dfa2064bSJan Kara struct ext4_inode *raw_inode, 1414dfa2064bSJan Kara int isize_diff, size_t ifree, 1415dfa2064bSJan Kara size_t bfree, int *total_ino) 1416dfa2064bSJan Kara { 1417dfa2064bSJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 1418dfa2064bSJan Kara struct ext4_xattr_entry *small_entry; 1419dfa2064bSJan Kara struct ext4_xattr_entry *entry; 1420dfa2064bSJan Kara struct ext4_xattr_entry *last; 1421dfa2064bSJan Kara unsigned int entry_size; /* EA entry size */ 1422dfa2064bSJan Kara unsigned int total_size; /* EA entry size + value size */ 1423dfa2064bSJan Kara unsigned int min_total_size; 1424dfa2064bSJan Kara int error; 1425dfa2064bSJan Kara 1426dfa2064bSJan Kara while (isize_diff > ifree) { 1427dfa2064bSJan Kara entry = NULL; 1428dfa2064bSJan Kara small_entry = NULL; 1429dfa2064bSJan Kara min_total_size = ~0U; 1430dfa2064bSJan Kara last = IFIRST(header); 1431dfa2064bSJan Kara /* Find the entry best suited to be pushed into EA block */ 1432dfa2064bSJan Kara for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1433dfa2064bSJan Kara total_size = 1434dfa2064bSJan Kara EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + 1435dfa2064bSJan Kara EXT4_XATTR_LEN(last->e_name_len); 1436dfa2064bSJan Kara if (total_size <= bfree && 1437dfa2064bSJan Kara total_size < min_total_size) { 1438dfa2064bSJan Kara if (total_size + ifree < isize_diff) { 1439dfa2064bSJan Kara small_entry = last; 1440dfa2064bSJan Kara } else { 1441dfa2064bSJan Kara entry = last; 1442dfa2064bSJan Kara min_total_size = total_size; 1443dfa2064bSJan Kara } 1444dfa2064bSJan Kara } 1445dfa2064bSJan Kara } 1446dfa2064bSJan Kara 1447dfa2064bSJan Kara if (entry == NULL) { 1448dfa2064bSJan Kara if (small_entry == NULL) 1449dfa2064bSJan Kara return -ENOSPC; 1450dfa2064bSJan Kara entry = small_entry; 1451dfa2064bSJan Kara } 1452dfa2064bSJan Kara 1453dfa2064bSJan Kara entry_size = EXT4_XATTR_LEN(entry->e_name_len); 1454dfa2064bSJan Kara total_size = entry_size + 1455dfa2064bSJan Kara EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)); 1456dfa2064bSJan Kara error = ext4_xattr_move_to_block(handle, inode, raw_inode, 1457dfa2064bSJan Kara entry); 1458dfa2064bSJan Kara if (error) 1459dfa2064bSJan Kara return error; 1460dfa2064bSJan Kara 1461dfa2064bSJan Kara *total_ino -= entry_size; 1462dfa2064bSJan Kara ifree += total_size; 1463dfa2064bSJan Kara bfree -= total_size; 1464dfa2064bSJan Kara } 1465dfa2064bSJan Kara 1466dfa2064bSJan Kara return 0; 1467dfa2064bSJan Kara } 1468dfa2064bSJan Kara 14693f2571c1SJan Kara /* 14706dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 14716dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 14726dd4ee7cSKalpak Shah */ 14736dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 14746dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 14756dd4ee7cSKalpak Shah { 14766dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 14776dd4ee7cSKalpak Shah struct buffer_head *bh = NULL; 1478e3014d14SJan Kara size_t min_offs; 1479e3014d14SJan Kara size_t ifree, bfree; 14807b1b2c1bSTheodore Ts'o int total_ino; 14816e0cd088SJan Kara void *base, *end; 1482d0141191SJan Kara int error = 0, tried_min_extra_isize = 0; 1483ac39849dSAneesh Kumar K.V int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); 1484d0141191SJan Kara int isize_diff; /* How much do we need to grow i_extra_isize */ 1485c755e251STheodore Ts'o int no_expand; 14866dd4ee7cSKalpak Shah 1487c755e251STheodore Ts'o if (ext4_write_trylock_xattr(inode, &no_expand) == 0) 1488c755e251STheodore Ts'o return 0; 1489c755e251STheodore Ts'o 14906dd4ee7cSKalpak Shah retry: 1491d0141191SJan Kara isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; 14922e81a4eeSJan Kara if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) 14932e81a4eeSJan Kara goto out; 14946dd4ee7cSKalpak Shah 14956dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 14966dd4ee7cSKalpak Shah 14976dd4ee7cSKalpak Shah /* 14986dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 14996dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 15006dd4ee7cSKalpak Shah */ 15016dd4ee7cSKalpak Shah 15026e0cd088SJan Kara base = IFIRST(header); 15036dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 15046dd4ee7cSKalpak Shah min_offs = end - base; 15056dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 15066dd4ee7cSKalpak Shah 15079e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 15089e92f48cSTheodore Ts'o if (error) 15099e92f48cSTheodore Ts'o goto cleanup; 15109e92f48cSTheodore Ts'o 15116e0cd088SJan Kara ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); 1512e3014d14SJan Kara if (ifree >= isize_diff) 1513e3014d14SJan Kara goto shift; 15146dd4ee7cSKalpak Shah 15156dd4ee7cSKalpak Shah /* 15166dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 15176dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 15186dd4ee7cSKalpak Shah */ 15196dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 15206dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 15216dd4ee7cSKalpak Shah error = -EIO; 15226dd4ee7cSKalpak Shah if (!bh) 15236dd4ee7cSKalpak Shah goto cleanup; 1524cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 152524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 152624676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 15276a797d27SDarrick J. Wong error = -EFSCORRUPTED; 15286dd4ee7cSKalpak Shah goto cleanup; 15296dd4ee7cSKalpak Shah } 15306dd4ee7cSKalpak Shah base = BHDR(bh); 15316dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 15326dd4ee7cSKalpak Shah min_offs = end - base; 15336e0cd088SJan Kara bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, 15346e0cd088SJan Kara NULL); 1535e3014d14SJan Kara if (bfree + ifree < isize_diff) { 15366dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 15376dd4ee7cSKalpak Shah tried_min_extra_isize++; 15386dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 15396dd4ee7cSKalpak Shah brelse(bh); 15406dd4ee7cSKalpak Shah goto retry; 15416dd4ee7cSKalpak Shah } 1542dfa2064bSJan Kara error = -ENOSPC; 15436dd4ee7cSKalpak Shah goto cleanup; 15446dd4ee7cSKalpak Shah } 15456dd4ee7cSKalpak Shah } else { 1546e3014d14SJan Kara bfree = inode->i_sb->s_blocksize; 15476dd4ee7cSKalpak Shah } 15486dd4ee7cSKalpak Shah 1549dfa2064bSJan Kara error = ext4_xattr_make_inode_space(handle, inode, raw_inode, 1550dfa2064bSJan Kara isize_diff, ifree, bfree, 1551dfa2064bSJan Kara &total_ino); 1552dfa2064bSJan Kara if (error) { 1553dfa2064bSJan Kara if (error == -ENOSPC && !tried_min_extra_isize && 15546dd4ee7cSKalpak Shah s_min_extra_isize) { 15556dd4ee7cSKalpak Shah tried_min_extra_isize++; 15566dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 1557dcb9917bSTheodore Ts'o brelse(bh); 15586dd4ee7cSKalpak Shah goto retry; 15596dd4ee7cSKalpak Shah } 15606dd4ee7cSKalpak Shah goto cleanup; 15616dd4ee7cSKalpak Shah } 1562e3014d14SJan Kara shift: 1563e3014d14SJan Kara /* Adjust the offsets and shift the remaining entries ahead */ 15646e0cd088SJan Kara ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize 1565e3014d14SJan Kara - new_extra_isize, (void *)raw_inode + 1566e3014d14SJan Kara EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 156794405713SJan Kara (void *)header, total_ino); 1568e3014d14SJan Kara EXT4_I(inode)->i_extra_isize = new_extra_isize; 15696dd4ee7cSKalpak Shah brelse(bh); 15702e81a4eeSJan Kara out: 1571c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 15726dd4ee7cSKalpak Shah return 0; 15736dd4ee7cSKalpak Shah 15746dd4ee7cSKalpak Shah cleanup: 15756dd4ee7cSKalpak Shah brelse(bh); 15762e81a4eeSJan Kara /* 1577c755e251STheodore Ts'o * Inode size expansion failed; don't try again 15782e81a4eeSJan Kara */ 1579c755e251STheodore Ts'o no_expand = 1; 1580c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 15816dd4ee7cSKalpak Shah return error; 15826dd4ee7cSKalpak Shah } 15836dd4ee7cSKalpak Shah 15846dd4ee7cSKalpak Shah 15856dd4ee7cSKalpak Shah 15866dd4ee7cSKalpak Shah /* 1587617ba13bSMingming Cao * ext4_xattr_delete_inode() 1588ac27a0ecSDave Kleikamp * 1589ac27a0ecSDave Kleikamp * Free extended attribute resources associated with this inode. This 1590ac27a0ecSDave Kleikamp * is called immediately before an inode is freed. We have exclusive 1591ac27a0ecSDave Kleikamp * access to the inode. 1592ac27a0ecSDave Kleikamp */ 1593ac27a0ecSDave Kleikamp void 1594617ba13bSMingming Cao ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) 1595ac27a0ecSDave Kleikamp { 1596ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 1597ac27a0ecSDave Kleikamp 1598617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 1599ac27a0ecSDave Kleikamp goto cleanup; 1600617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 1601ac27a0ecSDave Kleikamp if (!bh) { 160224676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 160324676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1604ac27a0ecSDave Kleikamp goto cleanup; 1605ac27a0ecSDave Kleikamp } 1606617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 1607ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) { 160824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 160924676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1610ac27a0ecSDave Kleikamp goto cleanup; 1611ac27a0ecSDave Kleikamp } 1612617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bh); 1613617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 1614ac27a0ecSDave Kleikamp 1615ac27a0ecSDave Kleikamp cleanup: 1616ac27a0ecSDave Kleikamp brelse(bh); 1617ac27a0ecSDave Kleikamp } 1618ac27a0ecSDave Kleikamp 1619ac27a0ecSDave Kleikamp /* 1620617ba13bSMingming Cao * ext4_xattr_cache_insert() 1621ac27a0ecSDave Kleikamp * 1622ac27a0ecSDave Kleikamp * Create a new entry in the extended attribute cache, and insert 1623ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 1624ac27a0ecSDave Kleikamp * 1625ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1626ac27a0ecSDave Kleikamp */ 1627ac27a0ecSDave Kleikamp static void 16287a2508e1SJan Kara ext4_xattr_cache_insert(struct mb_cache *ext4_mb_cache, struct buffer_head *bh) 1629ac27a0ecSDave Kleikamp { 16306048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 16316048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 16326048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 16336048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 1634ac27a0ecSDave Kleikamp int error; 1635ac27a0ecSDave Kleikamp 16367a2508e1SJan Kara error = mb_cache_entry_create(ext4_mb_cache, GFP_NOFS, hash, 16376048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 1638ac27a0ecSDave Kleikamp if (error) { 163982939d79SJan Kara if (error == -EBUSY) 1640ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 164182939d79SJan Kara } else 1642ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 1643ac27a0ecSDave Kleikamp } 1644ac27a0ecSDave Kleikamp 1645ac27a0ecSDave Kleikamp /* 1646617ba13bSMingming Cao * ext4_xattr_cmp() 1647ac27a0ecSDave Kleikamp * 1648ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 1649ac27a0ecSDave Kleikamp * 1650ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 1651ac27a0ecSDave Kleikamp * a negative error number on errors. 1652ac27a0ecSDave Kleikamp */ 1653ac27a0ecSDave Kleikamp static int 1654617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 1655617ba13bSMingming Cao struct ext4_xattr_header *header2) 1656ac27a0ecSDave Kleikamp { 1657617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 1658ac27a0ecSDave Kleikamp 1659ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 1660ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 1661ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 1662ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 1663ac27a0ecSDave Kleikamp return 1; 1664ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 1665ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 1666ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 1667ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 1668ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 1669ac27a0ecSDave Kleikamp return 1; 1670ac27a0ecSDave Kleikamp if (entry1->e_value_block != 0 || entry2->e_value_block != 0) 16716a797d27SDarrick J. Wong return -EFSCORRUPTED; 1672ac27a0ecSDave Kleikamp if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 1673ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 1674ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 1675ac27a0ecSDave Kleikamp return 1; 1676ac27a0ecSDave Kleikamp 1677617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 1678617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 1679ac27a0ecSDave Kleikamp } 1680ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 1681ac27a0ecSDave Kleikamp return 1; 1682ac27a0ecSDave Kleikamp return 0; 1683ac27a0ecSDave Kleikamp } 1684ac27a0ecSDave Kleikamp 1685ac27a0ecSDave Kleikamp /* 1686617ba13bSMingming Cao * ext4_xattr_cache_find() 1687ac27a0ecSDave Kleikamp * 1688ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 1689ac27a0ecSDave Kleikamp * 1690ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 1691ac27a0ecSDave Kleikamp * not found or an error occurred. 1692ac27a0ecSDave Kleikamp */ 1693ac27a0ecSDave Kleikamp static struct buffer_head * 1694617ba13bSMingming Cao ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, 16957a2508e1SJan Kara struct mb_cache_entry **pce) 1696ac27a0ecSDave Kleikamp { 1697ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 16987a2508e1SJan Kara struct mb_cache_entry *ce; 16997a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 1700ac27a0ecSDave Kleikamp 1701ac27a0ecSDave Kleikamp if (!header->h_hash) 1702ac27a0ecSDave Kleikamp return NULL; /* never share */ 1703ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 17047a2508e1SJan Kara ce = mb_cache_entry_find_first(ext4_mb_cache, hash); 1705ac27a0ecSDave Kleikamp while (ce) { 1706ac27a0ecSDave Kleikamp struct buffer_head *bh; 1707ac27a0ecSDave Kleikamp 1708ac27a0ecSDave Kleikamp bh = sb_bread(inode->i_sb, ce->e_block); 1709ac27a0ecSDave Kleikamp if (!bh) { 171024676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 171124676da4STheodore Ts'o (unsigned long) ce->e_block); 1712617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 1713ac27a0ecSDave Kleikamp *pce = ce; 1714ac27a0ecSDave Kleikamp return bh; 1715ac27a0ecSDave Kleikamp } 1716ac27a0ecSDave Kleikamp brelse(bh); 17177a2508e1SJan Kara ce = mb_cache_entry_find_next(ext4_mb_cache, ce); 1718ac27a0ecSDave Kleikamp } 1719ac27a0ecSDave Kleikamp return NULL; 1720ac27a0ecSDave Kleikamp } 1721ac27a0ecSDave Kleikamp 1722ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 1723ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 1724ac27a0ecSDave Kleikamp 1725ac27a0ecSDave Kleikamp /* 1726617ba13bSMingming Cao * ext4_xattr_hash_entry() 1727ac27a0ecSDave Kleikamp * 1728ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 1729ac27a0ecSDave Kleikamp */ 1730617ba13bSMingming Cao static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, 1731617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1732ac27a0ecSDave Kleikamp { 1733ac27a0ecSDave Kleikamp __u32 hash = 0; 1734ac27a0ecSDave Kleikamp char *name = entry->e_name; 1735ac27a0ecSDave Kleikamp int n; 1736ac27a0ecSDave Kleikamp 1737ac27a0ecSDave Kleikamp for (n = 0; n < entry->e_name_len; n++) { 1738ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 1739ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 1740ac27a0ecSDave Kleikamp *name++; 1741ac27a0ecSDave Kleikamp } 1742ac27a0ecSDave Kleikamp 17431cba4237SJan Kara if (entry->e_value_size != 0) { 1744ac27a0ecSDave Kleikamp __le32 *value = (__le32 *)((char *)header + 1745ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs)); 1746ac27a0ecSDave Kleikamp for (n = (le32_to_cpu(entry->e_value_size) + 1747617ba13bSMingming Cao EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { 1748ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 1749ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 1750ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 1751ac27a0ecSDave Kleikamp } 1752ac27a0ecSDave Kleikamp } 1753ac27a0ecSDave Kleikamp entry->e_hash = cpu_to_le32(hash); 1754ac27a0ecSDave Kleikamp } 1755ac27a0ecSDave Kleikamp 1756ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 1757ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 1758ac27a0ecSDave Kleikamp 1759ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 1760ac27a0ecSDave Kleikamp 1761ac27a0ecSDave Kleikamp /* 1762617ba13bSMingming Cao * ext4_xattr_rehash() 1763ac27a0ecSDave Kleikamp * 1764ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 1765ac27a0ecSDave Kleikamp */ 1766617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *header, 1767617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1768ac27a0ecSDave Kleikamp { 1769617ba13bSMingming Cao struct ext4_xattr_entry *here; 1770ac27a0ecSDave Kleikamp __u32 hash = 0; 1771ac27a0ecSDave Kleikamp 1772617ba13bSMingming Cao ext4_xattr_hash_entry(header, entry); 1773ac27a0ecSDave Kleikamp here = ENTRY(header+1); 1774ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 1775ac27a0ecSDave Kleikamp if (!here->e_hash) { 1776ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 1777ac27a0ecSDave Kleikamp hash = 0; 1778ac27a0ecSDave Kleikamp break; 1779ac27a0ecSDave Kleikamp } 1780ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 1781ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 1782ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 1783617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 1784ac27a0ecSDave Kleikamp } 1785ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 1786ac27a0ecSDave Kleikamp } 1787ac27a0ecSDave Kleikamp 1788ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 1789ac27a0ecSDave Kleikamp 17909c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 17919c191f70ST Makphaibulchoke 17927a2508e1SJan Kara struct mb_cache * 179382939d79SJan Kara ext4_xattr_create_cache(void) 1794ac27a0ecSDave Kleikamp { 17957a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 1796ac27a0ecSDave Kleikamp } 1797ac27a0ecSDave Kleikamp 17987a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 1799ac27a0ecSDave Kleikamp { 18009c191f70ST Makphaibulchoke if (cache) 18017a2508e1SJan Kara mb_cache_destroy(cache); 1802ac27a0ecSDave Kleikamp } 18039c191f70ST Makphaibulchoke 1804