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 1652c4f9923SEric Biggers ext4_xattr_check_entries(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; 2202c4f9923SEric Biggers error = ext4_xattr_check_entries(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; 2362c4f9923SEric Biggers error = ext4_xattr_check_entries(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 int 248617ba13bSMingming Cao ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, 249*6ba644b9SEric Biggers const char *name, int sorted) 250ac27a0ecSDave Kleikamp { 251617ba13bSMingming Cao struct ext4_xattr_entry *entry; 252ac27a0ecSDave Kleikamp size_t name_len; 253ac27a0ecSDave Kleikamp int cmp = 1; 254ac27a0ecSDave Kleikamp 255ac27a0ecSDave Kleikamp if (name == NULL) 256ac27a0ecSDave Kleikamp return -EINVAL; 257ac27a0ecSDave Kleikamp name_len = strlen(name); 258ac27a0ecSDave Kleikamp entry = *pentry; 259617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 260ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 261ac27a0ecSDave Kleikamp if (!cmp) 262ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 263ac27a0ecSDave Kleikamp if (!cmp) 264ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 265ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 266ac27a0ecSDave Kleikamp break; 267ac27a0ecSDave Kleikamp } 268ac27a0ecSDave Kleikamp *pentry = entry; 269ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 270ac27a0ecSDave Kleikamp } 271ac27a0ecSDave Kleikamp 272ac27a0ecSDave Kleikamp static int 273617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 274ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 275ac27a0ecSDave Kleikamp { 276ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 277617ba13bSMingming Cao struct ext4_xattr_entry *entry; 278ac27a0ecSDave Kleikamp size_t size; 279ac27a0ecSDave Kleikamp int error; 2807a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 281ac27a0ecSDave Kleikamp 282ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 283ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 284ac27a0ecSDave Kleikamp 285ac27a0ecSDave Kleikamp error = -ENODATA; 286617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 287ac27a0ecSDave Kleikamp goto cleanup; 288ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 289ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 290617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 291ac27a0ecSDave Kleikamp if (!bh) 292ac27a0ecSDave Kleikamp goto cleanup; 293ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 294ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 295cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 29624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 297617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 2986a797d27SDarrick J. Wong error = -EFSCORRUPTED; 299ac27a0ecSDave Kleikamp goto cleanup; 300ac27a0ecSDave Kleikamp } 3019c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, bh); 302ac27a0ecSDave Kleikamp entry = BFIRST(bh); 303*6ba644b9SEric Biggers error = ext4_xattr_find_entry(&entry, name_index, name, 1); 304ac27a0ecSDave Kleikamp if (error) 305ac27a0ecSDave Kleikamp goto cleanup; 306ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 307ac27a0ecSDave Kleikamp if (buffer) { 308ac27a0ecSDave Kleikamp error = -ERANGE; 309ac27a0ecSDave Kleikamp if (size > buffer_size) 310ac27a0ecSDave Kleikamp goto cleanup; 311ac27a0ecSDave Kleikamp memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs), 312ac27a0ecSDave Kleikamp size); 313ac27a0ecSDave Kleikamp } 314ac27a0ecSDave Kleikamp error = size; 315ac27a0ecSDave Kleikamp 316ac27a0ecSDave Kleikamp cleanup: 317ac27a0ecSDave Kleikamp brelse(bh); 318ac27a0ecSDave Kleikamp return error; 319ac27a0ecSDave Kleikamp } 320ac27a0ecSDave Kleikamp 321879b3825STao Ma int 322617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 323ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 324ac27a0ecSDave Kleikamp { 325617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 326617ba13bSMingming Cao struct ext4_xattr_entry *entry; 327617ba13bSMingming Cao struct ext4_inode *raw_inode; 328617ba13bSMingming Cao struct ext4_iloc iloc; 329ac27a0ecSDave Kleikamp size_t size; 330ac27a0ecSDave Kleikamp void *end; 331ac27a0ecSDave Kleikamp int error; 332ac27a0ecSDave Kleikamp 33319f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 334ac27a0ecSDave Kleikamp return -ENODATA; 335617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 336ac27a0ecSDave Kleikamp if (error) 337ac27a0ecSDave Kleikamp return error; 338617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 339ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 340617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 3419e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 342ac27a0ecSDave Kleikamp if (error) 343ac27a0ecSDave Kleikamp goto cleanup; 344*6ba644b9SEric Biggers entry = IFIRST(header); 345*6ba644b9SEric Biggers error = ext4_xattr_find_entry(&entry, name_index, name, 0); 346ac27a0ecSDave Kleikamp if (error) 347ac27a0ecSDave Kleikamp goto cleanup; 348ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 349ac27a0ecSDave Kleikamp if (buffer) { 350ac27a0ecSDave Kleikamp error = -ERANGE; 351ac27a0ecSDave Kleikamp if (size > buffer_size) 352ac27a0ecSDave Kleikamp goto cleanup; 353ac27a0ecSDave Kleikamp memcpy(buffer, (void *)IFIRST(header) + 354ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs), size); 355ac27a0ecSDave Kleikamp } 356ac27a0ecSDave Kleikamp error = size; 357ac27a0ecSDave Kleikamp 358ac27a0ecSDave Kleikamp cleanup: 359ac27a0ecSDave Kleikamp brelse(iloc.bh); 360ac27a0ecSDave Kleikamp return error; 361ac27a0ecSDave Kleikamp } 362ac27a0ecSDave Kleikamp 363ac27a0ecSDave Kleikamp /* 364617ba13bSMingming Cao * ext4_xattr_get() 365ac27a0ecSDave Kleikamp * 366ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 367ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 368ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 369ac27a0ecSDave Kleikamp * 370ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 371ac27a0ecSDave Kleikamp * used / required on success. 372ac27a0ecSDave Kleikamp */ 373ac27a0ecSDave Kleikamp int 374617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 375ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 376ac27a0ecSDave Kleikamp { 377ac27a0ecSDave Kleikamp int error; 378ac27a0ecSDave Kleikamp 3790db1ff22STheodore Ts'o if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 3800db1ff22STheodore Ts'o return -EIO; 3810db1ff22STheodore Ts'o 382230b8c1aSZhang Zhen if (strlen(name) > 255) 383230b8c1aSZhang Zhen return -ERANGE; 384230b8c1aSZhang Zhen 385617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 386617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 387ac27a0ecSDave Kleikamp buffer_size); 388ac27a0ecSDave Kleikamp if (error == -ENODATA) 389617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 390ac27a0ecSDave Kleikamp buffer_size); 391617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 392ac27a0ecSDave Kleikamp return error; 393ac27a0ecSDave Kleikamp } 394ac27a0ecSDave Kleikamp 395ac27a0ecSDave Kleikamp static int 396431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 397ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 398ac27a0ecSDave Kleikamp { 399ac27a0ecSDave Kleikamp size_t rest = buffer_size; 400ac27a0ecSDave Kleikamp 401617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 40211e27528SStephen Hemminger const struct xattr_handler *handler = 403617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 404ac27a0ecSDave Kleikamp 405764a5c6bSAndreas Gruenbacher if (handler && (!handler->list || handler->list(dentry))) { 406764a5c6bSAndreas Gruenbacher const char *prefix = handler->prefix ?: handler->name; 407764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 408764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 409764a5c6bSAndreas Gruenbacher 410ac27a0ecSDave Kleikamp if (buffer) { 411ac27a0ecSDave Kleikamp if (size > rest) 412ac27a0ecSDave Kleikamp return -ERANGE; 413764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 414764a5c6bSAndreas Gruenbacher buffer += prefix_len; 415764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 416764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 417764a5c6bSAndreas Gruenbacher *buffer++ = 0; 418ac27a0ecSDave Kleikamp } 419ac27a0ecSDave Kleikamp rest -= size; 420ac27a0ecSDave Kleikamp } 421ac27a0ecSDave Kleikamp } 422764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 423ac27a0ecSDave Kleikamp } 424ac27a0ecSDave Kleikamp 425ac27a0ecSDave Kleikamp static int 426431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 427ac27a0ecSDave Kleikamp { 4282b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 429ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 430ac27a0ecSDave Kleikamp int error; 4317a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 432ac27a0ecSDave Kleikamp 433ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 434ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 435ac27a0ecSDave Kleikamp 436ac27a0ecSDave Kleikamp error = 0; 437617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 438ac27a0ecSDave Kleikamp goto cleanup; 439ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 440ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 441617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 442ac27a0ecSDave Kleikamp error = -EIO; 443ac27a0ecSDave Kleikamp if (!bh) 444ac27a0ecSDave Kleikamp goto cleanup; 445ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 446ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 447cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 44824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 449617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 4506a797d27SDarrick J. Wong error = -EFSCORRUPTED; 451ac27a0ecSDave Kleikamp goto cleanup; 452ac27a0ecSDave Kleikamp } 4539c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, bh); 454431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); 455ac27a0ecSDave Kleikamp 456ac27a0ecSDave Kleikamp cleanup: 457ac27a0ecSDave Kleikamp brelse(bh); 458ac27a0ecSDave Kleikamp 459ac27a0ecSDave Kleikamp return error; 460ac27a0ecSDave Kleikamp } 461ac27a0ecSDave Kleikamp 462ac27a0ecSDave Kleikamp static int 463431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 464ac27a0ecSDave Kleikamp { 4652b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 466617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 467617ba13bSMingming Cao struct ext4_inode *raw_inode; 468617ba13bSMingming Cao struct ext4_iloc iloc; 469ac27a0ecSDave Kleikamp void *end; 470ac27a0ecSDave Kleikamp int error; 471ac27a0ecSDave Kleikamp 47219f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 473ac27a0ecSDave Kleikamp return 0; 474617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 475ac27a0ecSDave Kleikamp if (error) 476ac27a0ecSDave Kleikamp return error; 477617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 478ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 479617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 4809e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 481ac27a0ecSDave Kleikamp if (error) 482ac27a0ecSDave Kleikamp goto cleanup; 483431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 484ac27a0ecSDave Kleikamp buffer, buffer_size); 485ac27a0ecSDave Kleikamp 486ac27a0ecSDave Kleikamp cleanup: 487ac27a0ecSDave Kleikamp brelse(iloc.bh); 488ac27a0ecSDave Kleikamp return error; 489ac27a0ecSDave Kleikamp } 490ac27a0ecSDave Kleikamp 491ac27a0ecSDave Kleikamp /* 492ba7ea1d8SEric Biggers * Inode operation listxattr() 493ba7ea1d8SEric Biggers * 494ba7ea1d8SEric Biggers * d_inode(dentry)->i_rwsem: don't care 495ac27a0ecSDave Kleikamp * 496ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 497ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 498ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 499ac27a0ecSDave Kleikamp * 500ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 501ac27a0ecSDave Kleikamp * used / required on success. 502ac27a0ecSDave Kleikamp */ 503ba7ea1d8SEric Biggers ssize_t 504ba7ea1d8SEric Biggers ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) 505ac27a0ecSDave Kleikamp { 506eaeef867STheodore Ts'o int ret, ret2; 507ac27a0ecSDave Kleikamp 5082b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 509eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 510eaeef867STheodore Ts'o if (ret < 0) 511eaeef867STheodore Ts'o goto errout; 512ac27a0ecSDave Kleikamp if (buffer) { 513eaeef867STheodore Ts'o buffer += ret; 514eaeef867STheodore Ts'o buffer_size -= ret; 515ac27a0ecSDave Kleikamp } 516eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 517eaeef867STheodore Ts'o if (ret < 0) 518eaeef867STheodore Ts'o goto errout; 519eaeef867STheodore Ts'o ret += ret2; 520eaeef867STheodore Ts'o errout: 5212b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 522eaeef867STheodore Ts'o return ret; 523ac27a0ecSDave Kleikamp } 524ac27a0ecSDave Kleikamp 525ac27a0ecSDave Kleikamp /* 526617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 527ac27a0ecSDave Kleikamp * not set, set it. 528ac27a0ecSDave Kleikamp */ 529617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 530ac27a0ecSDave Kleikamp struct super_block *sb) 531ac27a0ecSDave Kleikamp { 532e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 533ac27a0ecSDave Kleikamp return; 534ac27a0ecSDave Kleikamp 5355d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 536617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 537e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 538a0375156STheodore Ts'o ext4_handle_dirty_super(handle, sb); 539ac27a0ecSDave Kleikamp } 540ac27a0ecSDave Kleikamp } 541ac27a0ecSDave Kleikamp 542ac27a0ecSDave Kleikamp /* 543ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 544ec4cb1aaSJan Kara * otherwise free the block. 545ac27a0ecSDave Kleikamp */ 546ac27a0ecSDave Kleikamp static void 547617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 548ac27a0ecSDave Kleikamp struct buffer_head *bh) 549ac27a0ecSDave Kleikamp { 5506048c64bSAndreas Gruenbacher struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 5516048c64bSAndreas Gruenbacher u32 hash, ref; 5528a2bfdcbSMingming Cao int error = 0; 553ac27a0ecSDave Kleikamp 5545d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 5558a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 5568a2bfdcbSMingming Cao if (error) 5578a2bfdcbSMingming Cao goto out; 5588a2bfdcbSMingming Cao 5598a2bfdcbSMingming Cao lock_buffer(bh); 5606048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 5616048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 5626048c64bSAndreas Gruenbacher if (ref == 1) { 563ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 56482939d79SJan Kara /* 56582939d79SJan Kara * This must happen under buffer lock for 56682939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 56782939d79SJan Kara */ 5686048c64bSAndreas Gruenbacher mb_cache_entry_delete_block(ext4_mb_cache, hash, bh->b_blocknr); 569ac27a0ecSDave Kleikamp get_bh(bh); 570ec4cb1aaSJan Kara unlock_buffer(bh); 571e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 572e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 573e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 574ac27a0ecSDave Kleikamp } else { 5756048c64bSAndreas Gruenbacher ref--; 5766048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 5776048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 5786048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 5796048c64bSAndreas Gruenbacher 5806048c64bSAndreas Gruenbacher ce = mb_cache_entry_get(ext4_mb_cache, hash, 5816048c64bSAndreas Gruenbacher bh->b_blocknr); 5826048c64bSAndreas Gruenbacher if (ce) { 5836048c64bSAndreas Gruenbacher ce->e_reusable = 1; 5846048c64bSAndreas Gruenbacher mb_cache_entry_put(ext4_mb_cache, ce); 5856048c64bSAndreas Gruenbacher } 5866048c64bSAndreas Gruenbacher } 5876048c64bSAndreas Gruenbacher 588dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bh); 589ec4cb1aaSJan Kara /* 590ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 591ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 592ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 593ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 594ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 595dac7a4b4STheodore Ts'o * call ext4_handle_dirty_metadata() with locked buffer as 596ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 597ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 598ec4cb1aaSJan Kara */ 599ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 600dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 601c1bb05a6SEric Sandeen unlock_buffer(bh); 602ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 603dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 604ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 6050390131bSFrank Mayhar ext4_handle_sync(handle); 6061231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 607ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 608ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 609ac27a0ecSDave Kleikamp } 6108a2bfdcbSMingming Cao out: 6118a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 6128a2bfdcbSMingming Cao return; 613ac27a0ecSDave Kleikamp } 614ac27a0ecSDave Kleikamp 6156dd4ee7cSKalpak Shah /* 6166dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 6176dd4ee7cSKalpak Shah * bytes used by EA entries. 6186dd4ee7cSKalpak Shah */ 6196dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 6206dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 6216dd4ee7cSKalpak Shah { 6226dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 6231cba4237SJan Kara if (last->e_value_size) { 6246dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 6256dd4ee7cSKalpak Shah if (offs < *min_offs) 6266dd4ee7cSKalpak Shah *min_offs = offs; 6276dd4ee7cSKalpak Shah } 6287b1b2c1bSTheodore Ts'o if (total) 6297b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 6306dd4ee7cSKalpak Shah } 6316dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 6326dd4ee7cSKalpak Shah } 6336dd4ee7cSKalpak Shah 634ac27a0ecSDave Kleikamp static int 635617ba13bSMingming Cao ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s) 636ac27a0ecSDave Kleikamp { 637617ba13bSMingming Cao struct ext4_xattr_entry *last; 638ac27a0ecSDave Kleikamp size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); 639ac27a0ecSDave Kleikamp 640ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 641ac27a0ecSDave Kleikamp last = s->first; 642617ba13bSMingming Cao for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 6431cba4237SJan Kara if (last->e_value_size) { 644ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 645ac27a0ecSDave Kleikamp if (offs < min_offs) 646ac27a0ecSDave Kleikamp min_offs = offs; 647ac27a0ecSDave Kleikamp } 648ac27a0ecSDave Kleikamp } 649ac27a0ecSDave Kleikamp free = min_offs - ((void *)last - s->base) - sizeof(__u32); 650ac27a0ecSDave Kleikamp if (!s->not_found) { 6511cba4237SJan Kara if (s->here->e_value_size) { 652ac27a0ecSDave Kleikamp size_t size = le32_to_cpu(s->here->e_value_size); 653617ba13bSMingming Cao free += EXT4_XATTR_SIZE(size); 654ac27a0ecSDave Kleikamp } 655617ba13bSMingming Cao free += EXT4_XATTR_LEN(name_len); 656ac27a0ecSDave Kleikamp } 657ac27a0ecSDave Kleikamp if (i->value) { 6585f80f62aSWei Yuan if (free < EXT4_XATTR_LEN(name_len) + 659617ba13bSMingming Cao EXT4_XATTR_SIZE(i->value_len)) 660ac27a0ecSDave Kleikamp return -ENOSPC; 661ac27a0ecSDave Kleikamp } 662ac27a0ecSDave Kleikamp 663ac27a0ecSDave Kleikamp if (i->value && s->not_found) { 664ac27a0ecSDave Kleikamp /* Insert the new name. */ 665617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 666ac27a0ecSDave Kleikamp size_t rest = (void *)last - (void *)s->here + sizeof(__u32); 667ac27a0ecSDave Kleikamp memmove((void *)s->here + size, s->here, rest); 668ac27a0ecSDave Kleikamp memset(s->here, 0, size); 669ac27a0ecSDave Kleikamp s->here->e_name_index = i->name_index; 670ac27a0ecSDave Kleikamp s->here->e_name_len = name_len; 671ac27a0ecSDave Kleikamp memcpy(s->here->e_name, i->name, name_len); 672ac27a0ecSDave Kleikamp } else { 6731cba4237SJan Kara if (s->here->e_value_size) { 674ac27a0ecSDave Kleikamp void *first_val = s->base + min_offs; 675ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(s->here->e_value_offs); 676ac27a0ecSDave Kleikamp void *val = s->base + offs; 677617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE( 678ac27a0ecSDave Kleikamp le32_to_cpu(s->here->e_value_size)); 679ac27a0ecSDave Kleikamp 680617ba13bSMingming Cao if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { 681ac27a0ecSDave Kleikamp /* The old and the new value have the same 682ac27a0ecSDave Kleikamp size. Just replace. */ 683ac27a0ecSDave Kleikamp s->here->e_value_size = 684ac27a0ecSDave Kleikamp cpu_to_le32(i->value_len); 685bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 686bd9926e8STheodore Ts'o memset(val, 0, size); 687bd9926e8STheodore Ts'o } else { 688bd9926e8STheodore Ts'o /* Clear pad bytes first. */ 689617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 690bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 691ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 692bd9926e8STheodore Ts'o } 693ac27a0ecSDave Kleikamp return 0; 694ac27a0ecSDave Kleikamp } 695ac27a0ecSDave Kleikamp 696ac27a0ecSDave Kleikamp /* Remove the old value. */ 697ac27a0ecSDave Kleikamp memmove(first_val + size, first_val, val - first_val); 698ac27a0ecSDave Kleikamp memset(first_val, 0, size); 699ac27a0ecSDave Kleikamp s->here->e_value_size = 0; 700ac27a0ecSDave Kleikamp s->here->e_value_offs = 0; 701ac27a0ecSDave Kleikamp min_offs += size; 702ac27a0ecSDave Kleikamp 703ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 704ac27a0ecSDave Kleikamp last = s->first; 705ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 706ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 7071cba4237SJan Kara if (last->e_value_size && o < offs) 708ac27a0ecSDave Kleikamp last->e_value_offs = 709ac27a0ecSDave Kleikamp cpu_to_le16(o + size); 710617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 711ac27a0ecSDave Kleikamp } 712ac27a0ecSDave Kleikamp } 713ac27a0ecSDave Kleikamp if (!i->value) { 714ac27a0ecSDave Kleikamp /* Remove the old name. */ 715617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 716ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 717ac27a0ecSDave Kleikamp memmove(s->here, (void *)s->here + size, 718ac27a0ecSDave Kleikamp (void *)last - (void *)s->here + sizeof(__u32)); 719ac27a0ecSDave Kleikamp memset(last, 0, size); 720ac27a0ecSDave Kleikamp } 721ac27a0ecSDave Kleikamp } 722ac27a0ecSDave Kleikamp 723ac27a0ecSDave Kleikamp if (i->value) { 724ac27a0ecSDave Kleikamp /* Insert the new value. */ 725ac27a0ecSDave Kleikamp s->here->e_value_size = cpu_to_le32(i->value_len); 726ac27a0ecSDave Kleikamp if (i->value_len) { 727617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE(i->value_len); 728ac27a0ecSDave Kleikamp void *val = s->base + min_offs - size; 729ac27a0ecSDave Kleikamp s->here->e_value_offs = cpu_to_le16(min_offs - size); 730bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 731bd9926e8STheodore Ts'o memset(val, 0, size); 732bd9926e8STheodore Ts'o } else { 733bd9926e8STheodore Ts'o /* Clear the pad bytes first. */ 734617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 735bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 736ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 737ac27a0ecSDave Kleikamp } 738ac27a0ecSDave Kleikamp } 739bd9926e8STheodore Ts'o } 740ac27a0ecSDave Kleikamp return 0; 741ac27a0ecSDave Kleikamp } 742ac27a0ecSDave Kleikamp 743617ba13bSMingming Cao struct ext4_xattr_block_find { 744617ba13bSMingming Cao struct ext4_xattr_search s; 745ac27a0ecSDave Kleikamp struct buffer_head *bh; 746ac27a0ecSDave Kleikamp }; 747ac27a0ecSDave Kleikamp 748ac27a0ecSDave Kleikamp static int 749617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 750617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 751ac27a0ecSDave Kleikamp { 752ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 753ac27a0ecSDave Kleikamp int error; 754ac27a0ecSDave Kleikamp 755ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 756ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 757ac27a0ecSDave Kleikamp 758617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 759ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 760617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 761ac27a0ecSDave Kleikamp error = -EIO; 762ac27a0ecSDave Kleikamp if (!bs->bh) 763ac27a0ecSDave Kleikamp goto cleanup; 764ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 765ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 766ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 767cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bs->bh)) { 76824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 76924676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 7706a797d27SDarrick J. Wong error = -EFSCORRUPTED; 771ac27a0ecSDave Kleikamp goto cleanup; 772ac27a0ecSDave Kleikamp } 773ac27a0ecSDave Kleikamp /* Find the named attribute. */ 774ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 775ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 776ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 777ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 778617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 779*6ba644b9SEric Biggers i->name, 1); 780ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 781ac27a0ecSDave Kleikamp goto cleanup; 782ac27a0ecSDave Kleikamp bs->s.not_found = error; 783ac27a0ecSDave Kleikamp } 784ac27a0ecSDave Kleikamp error = 0; 785ac27a0ecSDave Kleikamp 786ac27a0ecSDave Kleikamp cleanup: 787ac27a0ecSDave Kleikamp return error; 788ac27a0ecSDave Kleikamp } 789ac27a0ecSDave Kleikamp 790ac27a0ecSDave Kleikamp static int 791617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 792617ba13bSMingming Cao struct ext4_xattr_info *i, 793617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 794ac27a0ecSDave Kleikamp { 795ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 796ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 797617ba13bSMingming Cao struct ext4_xattr_search *s = &bs->s; 7987a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 7998a2bfdcbSMingming Cao int error = 0; 8007a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 801ac27a0ecSDave Kleikamp 802617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 803ac27a0ecSDave Kleikamp 804ac27a0ecSDave Kleikamp if (i->value && i->value_len > sb->s_blocksize) 805ac27a0ecSDave Kleikamp return -ENOSPC; 806ac27a0ecSDave Kleikamp if (s->base) { 8075d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 8088a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 8098a2bfdcbSMingming Cao if (error) 8108a2bfdcbSMingming Cao goto cleanup; 8118a2bfdcbSMingming Cao lock_buffer(bs->bh); 8128a2bfdcbSMingming Cao 813ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 81482939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 81582939d79SJan Kara 81682939d79SJan Kara /* 81782939d79SJan Kara * This must happen under buffer lock for 81882939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 81982939d79SJan Kara * block 82082939d79SJan Kara */ 8217a2508e1SJan Kara mb_cache_entry_delete_block(ext4_mb_cache, hash, 82282939d79SJan Kara bs->bh->b_blocknr); 823ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 824617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 825ac27a0ecSDave Kleikamp if (!error) { 826ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 827617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), 828ac27a0ecSDave Kleikamp s->here); 8299c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, 8309c191f70ST Makphaibulchoke bs->bh); 831ac27a0ecSDave Kleikamp } 832dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bs->bh); 833ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 8346a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 835ac27a0ecSDave Kleikamp goto bad_block; 836ac27a0ecSDave Kleikamp if (!error) 837dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 8380390131bSFrank Mayhar inode, 839ac27a0ecSDave Kleikamp bs->bh); 840ac27a0ecSDave Kleikamp if (error) 841ac27a0ecSDave Kleikamp goto cleanup; 842ac27a0ecSDave Kleikamp goto inserted; 843ac27a0ecSDave Kleikamp } else { 844ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 845ac27a0ecSDave Kleikamp 8468a2bfdcbSMingming Cao unlock_buffer(bs->bh); 847ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 848216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 849ac27a0ecSDave Kleikamp error = -ENOMEM; 850ac27a0ecSDave Kleikamp if (s->base == NULL) 851ac27a0ecSDave Kleikamp goto cleanup; 852ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 853ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 854ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 855ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 856ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 857ac27a0ecSDave Kleikamp } 858ac27a0ecSDave Kleikamp } else { 859ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 860216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 861ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 862ac27a0ecSDave Kleikamp error = -ENOMEM; 863ac27a0ecSDave Kleikamp if (s->base == NULL) 864ac27a0ecSDave Kleikamp goto cleanup; 865617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 866ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 867ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 868ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 869ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 870ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 871ac27a0ecSDave Kleikamp } 872ac27a0ecSDave Kleikamp 873617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 8746a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 875ac27a0ecSDave Kleikamp goto bad_block; 876ac27a0ecSDave Kleikamp if (error) 877ac27a0ecSDave Kleikamp goto cleanup; 878ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 879617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), s->here); 880ac27a0ecSDave Kleikamp 881ac27a0ecSDave Kleikamp inserted: 882ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 883617ba13bSMingming Cao new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); 884ac27a0ecSDave Kleikamp if (new_bh) { 885ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 886ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 887ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 888ac27a0ecSDave Kleikamp else { 8896048c64bSAndreas Gruenbacher u32 ref; 8906048c64bSAndreas Gruenbacher 891ac27a0ecSDave Kleikamp /* The old block is released after updating 892ac27a0ecSDave Kleikamp the inode. */ 8931231b3a1SLukas Czerner error = dquot_alloc_block(inode, 8941231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 8955dd4056dSChristoph Hellwig if (error) 896ac27a0ecSDave Kleikamp goto cleanup; 8975d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 898617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 899ac27a0ecSDave Kleikamp new_bh); 900ac27a0ecSDave Kleikamp if (error) 901ac27a0ecSDave Kleikamp goto cleanup_dquot; 902ac27a0ecSDave Kleikamp lock_buffer(new_bh); 90382939d79SJan Kara /* 90482939d79SJan Kara * We have to be careful about races with 9056048c64bSAndreas Gruenbacher * freeing, rehashing or adding references to 9066048c64bSAndreas Gruenbacher * xattr block. Once we hold buffer lock xattr 9076048c64bSAndreas Gruenbacher * block's state is stable so we can check 9086048c64bSAndreas Gruenbacher * whether the block got freed / rehashed or 9096048c64bSAndreas Gruenbacher * not. Since we unhash mbcache entry under 9106048c64bSAndreas Gruenbacher * buffer lock when freeing / rehashing xattr 9116048c64bSAndreas Gruenbacher * block, checking whether entry is still 9126048c64bSAndreas Gruenbacher * hashed is reliable. Same rules hold for 9136048c64bSAndreas Gruenbacher * e_reusable handling. 91482939d79SJan Kara */ 9156048c64bSAndreas Gruenbacher if (hlist_bl_unhashed(&ce->e_hash_list) || 9166048c64bSAndreas Gruenbacher !ce->e_reusable) { 91782939d79SJan Kara /* 91882939d79SJan Kara * Undo everything and check mbcache 91982939d79SJan Kara * again. 92082939d79SJan Kara */ 92182939d79SJan Kara unlock_buffer(new_bh); 92282939d79SJan Kara dquot_free_block(inode, 92382939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 92482939d79SJan Kara 1)); 92582939d79SJan Kara brelse(new_bh); 9267a2508e1SJan Kara mb_cache_entry_put(ext4_mb_cache, ce); 92782939d79SJan Kara ce = NULL; 92882939d79SJan Kara new_bh = NULL; 92982939d79SJan Kara goto inserted; 93082939d79SJan Kara } 9316048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 9326048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 9336048c64bSAndreas Gruenbacher if (ref >= EXT4_XATTR_REFCOUNT_MAX) 9346048c64bSAndreas Gruenbacher ce->e_reusable = 0; 935ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 9366048c64bSAndreas Gruenbacher ref); 937dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 938ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 939dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 9400390131bSFrank Mayhar inode, 941ac27a0ecSDave Kleikamp new_bh); 942ac27a0ecSDave Kleikamp if (error) 943ac27a0ecSDave Kleikamp goto cleanup_dquot; 944ac27a0ecSDave Kleikamp } 9457a2508e1SJan Kara mb_cache_entry_touch(ext4_mb_cache, ce); 9467a2508e1SJan Kara mb_cache_entry_put(ext4_mb_cache, ce); 947ac27a0ecSDave Kleikamp ce = NULL; 948ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 949ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 950ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 951ac27a0ecSDave Kleikamp new_bh = bs->bh; 952ac27a0ecSDave Kleikamp get_bh(new_bh); 953ac27a0ecSDave Kleikamp } else { 954ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 955fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 956fb0a387dSEric Sandeen 957fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 958d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 959fb0a387dSEric Sandeen 960fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 96112e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 962fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 963fb0a387dSEric Sandeen 96455f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 96555f020dbSAllison Henderson NULL, &error); 966ac27a0ecSDave Kleikamp if (error) 967ac27a0ecSDave Kleikamp goto cleanup; 968fb0a387dSEric Sandeen 96912e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 970fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 971fb0a387dSEric Sandeen 972ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 973ace36ad4SJoe Perches (unsigned long long)block); 974ac27a0ecSDave Kleikamp 975ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 976aebf0243SWang Shilong if (unlikely(!new_bh)) { 977860d21e2STheodore Ts'o error = -ENOMEM; 978ac27a0ecSDave Kleikamp getblk_failed: 9797dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 980e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 981ac27a0ecSDave Kleikamp goto cleanup; 982ac27a0ecSDave Kleikamp } 983ac27a0ecSDave Kleikamp lock_buffer(new_bh); 984617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 985ac27a0ecSDave Kleikamp if (error) { 986ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 987860d21e2STheodore Ts'o error = -EIO; 988ac27a0ecSDave Kleikamp goto getblk_failed; 989ac27a0ecSDave Kleikamp } 990ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 991dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 992ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 993ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 9949c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, new_bh); 995dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, 996dac7a4b4STheodore Ts'o new_bh); 997ac27a0ecSDave Kleikamp if (error) 998ac27a0ecSDave Kleikamp goto cleanup; 999ac27a0ecSDave Kleikamp } 1000ac27a0ecSDave Kleikamp } 1001ac27a0ecSDave Kleikamp 1002ac27a0ecSDave Kleikamp /* Update the inode. */ 1003617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 1004ac27a0ecSDave Kleikamp 1005ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 1006ac27a0ecSDave Kleikamp if (bs->bh && bs->bh != new_bh) 1007617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bs->bh); 1008ac27a0ecSDave Kleikamp error = 0; 1009ac27a0ecSDave Kleikamp 1010ac27a0ecSDave Kleikamp cleanup: 1011ac27a0ecSDave Kleikamp if (ce) 10127a2508e1SJan Kara mb_cache_entry_put(ext4_mb_cache, ce); 1013ac27a0ecSDave Kleikamp brelse(new_bh); 1014ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 1015ac27a0ecSDave Kleikamp kfree(s->base); 1016ac27a0ecSDave Kleikamp 1017ac27a0ecSDave Kleikamp return error; 1018ac27a0ecSDave Kleikamp 1019ac27a0ecSDave Kleikamp cleanup_dquot: 10201231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 1021ac27a0ecSDave Kleikamp goto cleanup; 1022ac27a0ecSDave Kleikamp 1023ac27a0ecSDave Kleikamp bad_block: 102424676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 102524676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1026ac27a0ecSDave Kleikamp goto cleanup; 1027ac27a0ecSDave Kleikamp 1028ac27a0ecSDave Kleikamp #undef header 1029ac27a0ecSDave Kleikamp } 1030ac27a0ecSDave Kleikamp 1031879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 1032617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 1033ac27a0ecSDave Kleikamp { 1034617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 1035617ba13bSMingming Cao struct ext4_inode *raw_inode; 1036ac27a0ecSDave Kleikamp int error; 1037ac27a0ecSDave Kleikamp 1038617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 1039ac27a0ecSDave Kleikamp return 0; 1040617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 1041ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 1042ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 1043ac27a0ecSDave Kleikamp is->s.here = is->s.first; 1044617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 104519f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 10469e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 1047ac27a0ecSDave Kleikamp if (error) 1048ac27a0ecSDave Kleikamp return error; 1049ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1050617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 1051*6ba644b9SEric Biggers i->name, 0); 1052ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1053ac27a0ecSDave Kleikamp return error; 1054ac27a0ecSDave Kleikamp is->s.not_found = error; 1055ac27a0ecSDave Kleikamp } 1056ac27a0ecSDave Kleikamp return 0; 1057ac27a0ecSDave Kleikamp } 1058ac27a0ecSDave Kleikamp 10590d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 10600d812f77STao Ma struct ext4_xattr_info *i, 10610d812f77STao Ma struct ext4_xattr_ibody_find *is) 10620d812f77STao Ma { 10630d812f77STao Ma struct ext4_xattr_ibody_header *header; 10640d812f77STao Ma struct ext4_xattr_search *s = &is->s; 10650d812f77STao Ma int error; 10660d812f77STao Ma 10670d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 10680d812f77STao Ma return -ENOSPC; 10690d812f77STao Ma error = ext4_xattr_set_entry(i, s); 10700d812f77STao Ma if (error) { 10710d812f77STao Ma if (error == -ENOSPC && 10720d812f77STao Ma ext4_has_inline_data(inode)) { 10730d812f77STao Ma error = ext4_try_to_evict_inline_data(handle, inode, 10740d812f77STao Ma EXT4_XATTR_LEN(strlen(i->name) + 10750d812f77STao Ma EXT4_XATTR_SIZE(i->value_len))); 10760d812f77STao Ma if (error) 10770d812f77STao Ma return error; 10780d812f77STao Ma error = ext4_xattr_ibody_find(inode, i, is); 10790d812f77STao Ma if (error) 10800d812f77STao Ma return error; 10810d812f77STao Ma error = ext4_xattr_set_entry(i, s); 10820d812f77STao Ma } 10830d812f77STao Ma if (error) 10840d812f77STao Ma return error; 10850d812f77STao Ma } 10860d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 10870d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 10880d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 10890d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 10900d812f77STao Ma } else { 10910d812f77STao Ma header->h_magic = cpu_to_le32(0); 10920d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 10930d812f77STao Ma } 10940d812f77STao Ma return 0; 10950d812f77STao Ma } 10960d812f77STao Ma 1097d5c8dab6SEric Whitney static int ext4_xattr_ibody_set(struct inode *inode, 1098617ba13bSMingming Cao struct ext4_xattr_info *i, 1099617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 1100ac27a0ecSDave Kleikamp { 1101617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 1102617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 1103ac27a0ecSDave Kleikamp int error; 1104ac27a0ecSDave Kleikamp 1105617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 1106ac27a0ecSDave Kleikamp return -ENOSPC; 1107617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 1108ac27a0ecSDave Kleikamp if (error) 1109ac27a0ecSDave Kleikamp return error; 1110617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 1111ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 1112617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 111319f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 1114ac27a0ecSDave Kleikamp } else { 1115ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 111619f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 1117ac27a0ecSDave Kleikamp } 1118ac27a0ecSDave Kleikamp return 0; 1119ac27a0ecSDave Kleikamp } 1120ac27a0ecSDave Kleikamp 11213fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 11223fd16462SJan Kara struct ext4_xattr_info *i) 11233fd16462SJan Kara { 11243fd16462SJan Kara void *value; 11253fd16462SJan Kara 11263fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 11273fd16462SJan Kara return 0; 11283fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 11293fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 11303fd16462SJan Kara } 11313fd16462SJan Kara 1132ac27a0ecSDave Kleikamp /* 1133617ba13bSMingming Cao * ext4_xattr_set_handle() 1134ac27a0ecSDave Kleikamp * 11356e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 1136ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 1137ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 1138ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 1139ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 1140ac27a0ecSDave Kleikamp * previous to the call, respectively. 1141ac27a0ecSDave Kleikamp * 1142ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1143ac27a0ecSDave Kleikamp */ 1144ac27a0ecSDave Kleikamp int 1145617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 1146ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 1147ac27a0ecSDave Kleikamp int flags) 1148ac27a0ecSDave Kleikamp { 1149617ba13bSMingming Cao struct ext4_xattr_info i = { 1150ac27a0ecSDave Kleikamp .name_index = name_index, 1151ac27a0ecSDave Kleikamp .name = name, 1152ac27a0ecSDave Kleikamp .value = value, 1153ac27a0ecSDave Kleikamp .value_len = value_len, 1154ac27a0ecSDave Kleikamp 1155ac27a0ecSDave Kleikamp }; 1156617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 1157ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1158ac27a0ecSDave Kleikamp }; 1159617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 1160ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1161ac27a0ecSDave Kleikamp }; 1162c755e251STheodore Ts'o int no_expand; 1163ac27a0ecSDave Kleikamp int error; 1164ac27a0ecSDave Kleikamp 1165ac27a0ecSDave Kleikamp if (!name) 1166ac27a0ecSDave Kleikamp return -EINVAL; 1167ac27a0ecSDave Kleikamp if (strlen(name) > 255) 1168ac27a0ecSDave Kleikamp return -ERANGE; 1169c755e251STheodore Ts'o ext4_write_lock_xattr(inode, &no_expand); 11704d20c685SKalpak Shah 117166543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 117286ebfd08SEric Sandeen if (error) 117386ebfd08SEric Sandeen goto cleanup; 117486ebfd08SEric Sandeen 117519f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 1176617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 1177617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 117819f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 1179ac27a0ecSDave Kleikamp } 1180ac27a0ecSDave Kleikamp 1181617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 1182ac27a0ecSDave Kleikamp if (error) 1183ac27a0ecSDave Kleikamp goto cleanup; 1184ac27a0ecSDave Kleikamp if (is.s.not_found) 1185617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 1186ac27a0ecSDave Kleikamp if (error) 1187ac27a0ecSDave Kleikamp goto cleanup; 1188ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 1189ac27a0ecSDave Kleikamp error = -ENODATA; 1190ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 1191ac27a0ecSDave Kleikamp goto cleanup; 1192ac27a0ecSDave Kleikamp error = 0; 1193ac27a0ecSDave Kleikamp if (!value) 1194ac27a0ecSDave Kleikamp goto cleanup; 1195ac27a0ecSDave Kleikamp } else { 1196ac27a0ecSDave Kleikamp error = -EEXIST; 1197ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 1198ac27a0ecSDave Kleikamp goto cleanup; 1199ac27a0ecSDave Kleikamp } 1200ac27a0ecSDave Kleikamp if (!value) { 1201ac27a0ecSDave Kleikamp if (!is.s.not_found) 1202d5c8dab6SEric Whitney error = ext4_xattr_ibody_set(inode, &i, &is); 1203ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 1204617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1205ac27a0ecSDave Kleikamp } else { 12063fd16462SJan Kara error = 0; 12073fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 12083fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 12093fd16462SJan Kara goto cleanup; 12103fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 12113fd16462SJan Kara goto cleanup; 12123fd16462SJan Kara 1213d5c8dab6SEric Whitney error = ext4_xattr_ibody_set(inode, &i, &is); 1214ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 1215ac27a0ecSDave Kleikamp i.value = NULL; 1216617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1217ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 12187e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 12197e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 12207e01c8e5STiger Yang if (error) 12217e01c8e5STiger Yang goto cleanup; 12227e01c8e5STiger Yang } 1223617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1224ac27a0ecSDave Kleikamp if (error) 1225ac27a0ecSDave Kleikamp goto cleanup; 1226ac27a0ecSDave Kleikamp if (!is.s.not_found) { 1227ac27a0ecSDave Kleikamp i.value = NULL; 1228d5c8dab6SEric Whitney error = ext4_xattr_ibody_set(inode, &i, &is); 1229ac27a0ecSDave Kleikamp } 1230ac27a0ecSDave Kleikamp } 1231ac27a0ecSDave Kleikamp } 1232ac27a0ecSDave Kleikamp if (!error) { 1233617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 1234eeca7ea1SDeepa Dinamani inode->i_ctime = current_time(inode); 12356dd4ee7cSKalpak Shah if (!value) 1236c755e251STheodore Ts'o no_expand = 0; 1237617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 1238ac27a0ecSDave Kleikamp /* 1239617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 1240ac27a0ecSDave Kleikamp * error != 0. 1241ac27a0ecSDave Kleikamp */ 1242ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 1243ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 12440390131bSFrank Mayhar ext4_handle_sync(handle); 1245ac27a0ecSDave Kleikamp } 1246ac27a0ecSDave Kleikamp 1247ac27a0ecSDave Kleikamp cleanup: 1248ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 1249ac27a0ecSDave Kleikamp brelse(bs.bh); 1250c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 1251ac27a0ecSDave Kleikamp return error; 1252ac27a0ecSDave Kleikamp } 1253ac27a0ecSDave Kleikamp 1254ac27a0ecSDave Kleikamp /* 1255617ba13bSMingming Cao * ext4_xattr_set() 1256ac27a0ecSDave Kleikamp * 1257617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 1258ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 1259ac27a0ecSDave Kleikamp * 1260ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1261ac27a0ecSDave Kleikamp */ 1262ac27a0ecSDave Kleikamp int 1263617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 1264ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 1265ac27a0ecSDave Kleikamp { 1266ac27a0ecSDave Kleikamp handle_t *handle; 1267ac27a0ecSDave Kleikamp int error, retries = 0; 126895eaefbdSTheodore Ts'o int credits = ext4_jbd2_credits_xattr(inode); 1269ac27a0ecSDave Kleikamp 1270ac27a0ecSDave Kleikamp retry: 12719924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 1272ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 1273ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 1274ac27a0ecSDave Kleikamp } else { 1275ac27a0ecSDave Kleikamp int error2; 1276ac27a0ecSDave Kleikamp 1277617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 1278ac27a0ecSDave Kleikamp value, value_len, flags); 1279617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 1280ac27a0ecSDave Kleikamp if (error == -ENOSPC && 1281617ba13bSMingming Cao ext4_should_retry_alloc(inode->i_sb, &retries)) 1282ac27a0ecSDave Kleikamp goto retry; 1283ac27a0ecSDave Kleikamp if (error == 0) 1284ac27a0ecSDave Kleikamp error = error2; 1285ac27a0ecSDave Kleikamp } 1286ac27a0ecSDave Kleikamp 1287ac27a0ecSDave Kleikamp return error; 1288ac27a0ecSDave Kleikamp } 1289ac27a0ecSDave Kleikamp 1290ac27a0ecSDave Kleikamp /* 12916dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 12926dd4ee7cSKalpak Shah * i_extra_isize. 12936dd4ee7cSKalpak Shah */ 12946dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 12956dd4ee7cSKalpak Shah int value_offs_shift, void *to, 129694405713SJan Kara void *from, size_t n) 12976dd4ee7cSKalpak Shah { 12986dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 12996dd4ee7cSKalpak Shah int new_offs; 13006dd4ee7cSKalpak Shah 130194405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 130294405713SJan Kara BUG_ON(value_offs_shift > 0); 130394405713SJan Kara 13046dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 13056dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 13061cba4237SJan Kara if (last->e_value_size) { 13076dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 13086dd4ee7cSKalpak Shah value_offs_shift; 13096dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 13106dd4ee7cSKalpak Shah } 13116dd4ee7cSKalpak Shah } 13126dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 13136dd4ee7cSKalpak Shah memmove(to, from, n); 13146dd4ee7cSKalpak Shah } 13156dd4ee7cSKalpak Shah 13166dd4ee7cSKalpak Shah /* 13173f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 13183f2571c1SJan Kara */ 13193f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 13203f2571c1SJan Kara struct ext4_inode *raw_inode, 13213f2571c1SJan Kara struct ext4_xattr_entry *entry) 13223f2571c1SJan Kara { 13233f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 13243f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 13253f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 13263f2571c1SJan Kara size_t value_offs, value_size; 13273f2571c1SJan Kara struct ext4_xattr_info i = { 13283f2571c1SJan Kara .value = NULL, 13293f2571c1SJan Kara .value_len = 0, 13303f2571c1SJan Kara .name_index = entry->e_name_index, 13313f2571c1SJan Kara }; 13323f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 13333f2571c1SJan Kara int error; 13343f2571c1SJan Kara 13353f2571c1SJan Kara value_offs = le16_to_cpu(entry->e_value_offs); 13363f2571c1SJan Kara value_size = le32_to_cpu(entry->e_value_size); 13373f2571c1SJan Kara 13383f2571c1SJan Kara is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 13393f2571c1SJan Kara bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 13403f2571c1SJan Kara buffer = kmalloc(value_size, GFP_NOFS); 13413f2571c1SJan Kara b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 13423f2571c1SJan Kara if (!is || !bs || !buffer || !b_entry_name) { 13433f2571c1SJan Kara error = -ENOMEM; 13443f2571c1SJan Kara goto out; 13453f2571c1SJan Kara } 13463f2571c1SJan Kara 13473f2571c1SJan Kara is->s.not_found = -ENODATA; 13483f2571c1SJan Kara bs->s.not_found = -ENODATA; 13493f2571c1SJan Kara is->iloc.bh = NULL; 13503f2571c1SJan Kara bs->bh = NULL; 13513f2571c1SJan Kara 13523f2571c1SJan Kara /* Save the entry name and the entry value */ 13533f2571c1SJan Kara memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); 13543f2571c1SJan Kara memcpy(b_entry_name, entry->e_name, entry->e_name_len); 13553f2571c1SJan Kara b_entry_name[entry->e_name_len] = '\0'; 13563f2571c1SJan Kara i.name = b_entry_name; 13573f2571c1SJan Kara 13583f2571c1SJan Kara error = ext4_get_inode_loc(inode, &is->iloc); 13593f2571c1SJan Kara if (error) 13603f2571c1SJan Kara goto out; 13613f2571c1SJan Kara 13623f2571c1SJan Kara error = ext4_xattr_ibody_find(inode, &i, is); 13633f2571c1SJan Kara if (error) 13643f2571c1SJan Kara goto out; 13653f2571c1SJan Kara 13663f2571c1SJan Kara /* Remove the chosen entry from the inode */ 1367d5c8dab6SEric Whitney error = ext4_xattr_ibody_set(inode, &i, is); 13683f2571c1SJan Kara if (error) 13693f2571c1SJan Kara goto out; 13703f2571c1SJan Kara 13713f2571c1SJan Kara i.name = b_entry_name; 13723f2571c1SJan Kara i.value = buffer; 13733f2571c1SJan Kara i.value_len = value_size; 13743f2571c1SJan Kara error = ext4_xattr_block_find(inode, &i, bs); 13753f2571c1SJan Kara if (error) 13763f2571c1SJan Kara goto out; 13773f2571c1SJan Kara 13783f2571c1SJan Kara /* Add entry which was removed from the inode into the block */ 13793f2571c1SJan Kara error = ext4_xattr_block_set(handle, inode, &i, bs); 13803f2571c1SJan Kara if (error) 13813f2571c1SJan Kara goto out; 13823f2571c1SJan Kara error = 0; 13833f2571c1SJan Kara out: 13843f2571c1SJan Kara kfree(b_entry_name); 13853f2571c1SJan Kara kfree(buffer); 13863f2571c1SJan Kara if (is) 13873f2571c1SJan Kara brelse(is->iloc.bh); 13883f2571c1SJan Kara kfree(is); 13893f2571c1SJan Kara kfree(bs); 13903f2571c1SJan Kara 13913f2571c1SJan Kara return error; 13923f2571c1SJan Kara } 13933f2571c1SJan Kara 1394dfa2064bSJan Kara static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, 1395dfa2064bSJan Kara struct ext4_inode *raw_inode, 1396dfa2064bSJan Kara int isize_diff, size_t ifree, 1397dfa2064bSJan Kara size_t bfree, int *total_ino) 1398dfa2064bSJan Kara { 1399dfa2064bSJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 1400dfa2064bSJan Kara struct ext4_xattr_entry *small_entry; 1401dfa2064bSJan Kara struct ext4_xattr_entry *entry; 1402dfa2064bSJan Kara struct ext4_xattr_entry *last; 1403dfa2064bSJan Kara unsigned int entry_size; /* EA entry size */ 1404dfa2064bSJan Kara unsigned int total_size; /* EA entry size + value size */ 1405dfa2064bSJan Kara unsigned int min_total_size; 1406dfa2064bSJan Kara int error; 1407dfa2064bSJan Kara 1408dfa2064bSJan Kara while (isize_diff > ifree) { 1409dfa2064bSJan Kara entry = NULL; 1410dfa2064bSJan Kara small_entry = NULL; 1411dfa2064bSJan Kara min_total_size = ~0U; 1412dfa2064bSJan Kara last = IFIRST(header); 1413dfa2064bSJan Kara /* Find the entry best suited to be pushed into EA block */ 1414dfa2064bSJan Kara for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1415dfa2064bSJan Kara total_size = 1416dfa2064bSJan Kara EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + 1417dfa2064bSJan Kara EXT4_XATTR_LEN(last->e_name_len); 1418dfa2064bSJan Kara if (total_size <= bfree && 1419dfa2064bSJan Kara total_size < min_total_size) { 1420dfa2064bSJan Kara if (total_size + ifree < isize_diff) { 1421dfa2064bSJan Kara small_entry = last; 1422dfa2064bSJan Kara } else { 1423dfa2064bSJan Kara entry = last; 1424dfa2064bSJan Kara min_total_size = total_size; 1425dfa2064bSJan Kara } 1426dfa2064bSJan Kara } 1427dfa2064bSJan Kara } 1428dfa2064bSJan Kara 1429dfa2064bSJan Kara if (entry == NULL) { 1430dfa2064bSJan Kara if (small_entry == NULL) 1431dfa2064bSJan Kara return -ENOSPC; 1432dfa2064bSJan Kara entry = small_entry; 1433dfa2064bSJan Kara } 1434dfa2064bSJan Kara 1435dfa2064bSJan Kara entry_size = EXT4_XATTR_LEN(entry->e_name_len); 1436dfa2064bSJan Kara total_size = entry_size + 1437dfa2064bSJan Kara EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)); 1438dfa2064bSJan Kara error = ext4_xattr_move_to_block(handle, inode, raw_inode, 1439dfa2064bSJan Kara entry); 1440dfa2064bSJan Kara if (error) 1441dfa2064bSJan Kara return error; 1442dfa2064bSJan Kara 1443dfa2064bSJan Kara *total_ino -= entry_size; 1444dfa2064bSJan Kara ifree += total_size; 1445dfa2064bSJan Kara bfree -= total_size; 1446dfa2064bSJan Kara } 1447dfa2064bSJan Kara 1448dfa2064bSJan Kara return 0; 1449dfa2064bSJan Kara } 1450dfa2064bSJan Kara 14513f2571c1SJan Kara /* 14526dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 14536dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 14546dd4ee7cSKalpak Shah */ 14556dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 14566dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 14576dd4ee7cSKalpak Shah { 14586dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 14596dd4ee7cSKalpak Shah struct buffer_head *bh = NULL; 1460e3014d14SJan Kara size_t min_offs; 1461e3014d14SJan Kara size_t ifree, bfree; 14627b1b2c1bSTheodore Ts'o int total_ino; 14636e0cd088SJan Kara void *base, *end; 1464d0141191SJan Kara int error = 0, tried_min_extra_isize = 0; 1465ac39849dSAneesh Kumar K.V int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); 1466d0141191SJan Kara int isize_diff; /* How much do we need to grow i_extra_isize */ 1467c755e251STheodore Ts'o int no_expand; 14686dd4ee7cSKalpak Shah 1469c755e251STheodore Ts'o if (ext4_write_trylock_xattr(inode, &no_expand) == 0) 1470c755e251STheodore Ts'o return 0; 1471c755e251STheodore Ts'o 14726dd4ee7cSKalpak Shah retry: 1473d0141191SJan Kara isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; 14742e81a4eeSJan Kara if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) 14752e81a4eeSJan Kara goto out; 14766dd4ee7cSKalpak Shah 14776dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 14786dd4ee7cSKalpak Shah 14796dd4ee7cSKalpak Shah /* 14806dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 14816dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 14826dd4ee7cSKalpak Shah */ 14836dd4ee7cSKalpak Shah 14846e0cd088SJan Kara base = IFIRST(header); 14856dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 14866dd4ee7cSKalpak Shah min_offs = end - base; 14876dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 14886dd4ee7cSKalpak Shah 14899e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 14909e92f48cSTheodore Ts'o if (error) 14919e92f48cSTheodore Ts'o goto cleanup; 14929e92f48cSTheodore Ts'o 14936e0cd088SJan Kara ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); 1494e3014d14SJan Kara if (ifree >= isize_diff) 1495e3014d14SJan Kara goto shift; 14966dd4ee7cSKalpak Shah 14976dd4ee7cSKalpak Shah /* 14986dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 14996dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 15006dd4ee7cSKalpak Shah */ 15016dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 15026dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 15036dd4ee7cSKalpak Shah error = -EIO; 15046dd4ee7cSKalpak Shah if (!bh) 15056dd4ee7cSKalpak Shah goto cleanup; 1506cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 150724676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 150824676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 15096a797d27SDarrick J. Wong error = -EFSCORRUPTED; 15106dd4ee7cSKalpak Shah goto cleanup; 15116dd4ee7cSKalpak Shah } 15126dd4ee7cSKalpak Shah base = BHDR(bh); 15136dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 15146dd4ee7cSKalpak Shah min_offs = end - base; 15156e0cd088SJan Kara bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, 15166e0cd088SJan Kara NULL); 1517e3014d14SJan Kara if (bfree + ifree < isize_diff) { 15186dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 15196dd4ee7cSKalpak Shah tried_min_extra_isize++; 15206dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 15216dd4ee7cSKalpak Shah brelse(bh); 15226dd4ee7cSKalpak Shah goto retry; 15236dd4ee7cSKalpak Shah } 1524dfa2064bSJan Kara error = -ENOSPC; 15256dd4ee7cSKalpak Shah goto cleanup; 15266dd4ee7cSKalpak Shah } 15276dd4ee7cSKalpak Shah } else { 1528e3014d14SJan Kara bfree = inode->i_sb->s_blocksize; 15296dd4ee7cSKalpak Shah } 15306dd4ee7cSKalpak Shah 1531dfa2064bSJan Kara error = ext4_xattr_make_inode_space(handle, inode, raw_inode, 1532dfa2064bSJan Kara isize_diff, ifree, bfree, 1533dfa2064bSJan Kara &total_ino); 1534dfa2064bSJan Kara if (error) { 1535dfa2064bSJan Kara if (error == -ENOSPC && !tried_min_extra_isize && 15366dd4ee7cSKalpak Shah s_min_extra_isize) { 15376dd4ee7cSKalpak Shah tried_min_extra_isize++; 15386dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 1539dcb9917bSTheodore Ts'o brelse(bh); 15406dd4ee7cSKalpak Shah goto retry; 15416dd4ee7cSKalpak Shah } 15426dd4ee7cSKalpak Shah goto cleanup; 15436dd4ee7cSKalpak Shah } 1544e3014d14SJan Kara shift: 1545e3014d14SJan Kara /* Adjust the offsets and shift the remaining entries ahead */ 15466e0cd088SJan Kara ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize 1547e3014d14SJan Kara - new_extra_isize, (void *)raw_inode + 1548e3014d14SJan Kara EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 154994405713SJan Kara (void *)header, total_ino); 1550e3014d14SJan Kara EXT4_I(inode)->i_extra_isize = new_extra_isize; 15516dd4ee7cSKalpak Shah brelse(bh); 15522e81a4eeSJan Kara out: 1553c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 15546dd4ee7cSKalpak Shah return 0; 15556dd4ee7cSKalpak Shah 15566dd4ee7cSKalpak Shah cleanup: 15576dd4ee7cSKalpak Shah brelse(bh); 15582e81a4eeSJan Kara /* 1559c755e251STheodore Ts'o * Inode size expansion failed; don't try again 15602e81a4eeSJan Kara */ 1561c755e251STheodore Ts'o no_expand = 1; 1562c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 15636dd4ee7cSKalpak Shah return error; 15646dd4ee7cSKalpak Shah } 15656dd4ee7cSKalpak Shah 15666dd4ee7cSKalpak Shah 15676dd4ee7cSKalpak Shah 15686dd4ee7cSKalpak Shah /* 1569617ba13bSMingming Cao * ext4_xattr_delete_inode() 1570ac27a0ecSDave Kleikamp * 1571ac27a0ecSDave Kleikamp * Free extended attribute resources associated with this inode. This 1572ac27a0ecSDave Kleikamp * is called immediately before an inode is freed. We have exclusive 1573ac27a0ecSDave Kleikamp * access to the inode. 1574ac27a0ecSDave Kleikamp */ 1575ac27a0ecSDave Kleikamp void 1576617ba13bSMingming Cao ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) 1577ac27a0ecSDave Kleikamp { 1578ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 1579ac27a0ecSDave Kleikamp 1580617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 1581ac27a0ecSDave Kleikamp goto cleanup; 1582617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 1583ac27a0ecSDave Kleikamp if (!bh) { 158424676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 158524676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1586ac27a0ecSDave Kleikamp goto cleanup; 1587ac27a0ecSDave Kleikamp } 1588617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 1589ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) { 159024676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 159124676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1592ac27a0ecSDave Kleikamp goto cleanup; 1593ac27a0ecSDave Kleikamp } 1594617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bh); 1595617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 1596ac27a0ecSDave Kleikamp 1597ac27a0ecSDave Kleikamp cleanup: 1598ac27a0ecSDave Kleikamp brelse(bh); 1599ac27a0ecSDave Kleikamp } 1600ac27a0ecSDave Kleikamp 1601ac27a0ecSDave Kleikamp /* 1602617ba13bSMingming Cao * ext4_xattr_cache_insert() 1603ac27a0ecSDave Kleikamp * 1604ac27a0ecSDave Kleikamp * Create a new entry in the extended attribute cache, and insert 1605ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 1606ac27a0ecSDave Kleikamp * 1607ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1608ac27a0ecSDave Kleikamp */ 1609ac27a0ecSDave Kleikamp static void 16107a2508e1SJan Kara ext4_xattr_cache_insert(struct mb_cache *ext4_mb_cache, struct buffer_head *bh) 1611ac27a0ecSDave Kleikamp { 16126048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 16136048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 16146048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 16156048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 1616ac27a0ecSDave Kleikamp int error; 1617ac27a0ecSDave Kleikamp 16187a2508e1SJan Kara error = mb_cache_entry_create(ext4_mb_cache, GFP_NOFS, hash, 16196048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 1620ac27a0ecSDave Kleikamp if (error) { 162182939d79SJan Kara if (error == -EBUSY) 1622ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 162382939d79SJan Kara } else 1624ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 1625ac27a0ecSDave Kleikamp } 1626ac27a0ecSDave Kleikamp 1627ac27a0ecSDave Kleikamp /* 1628617ba13bSMingming Cao * ext4_xattr_cmp() 1629ac27a0ecSDave Kleikamp * 1630ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 1631ac27a0ecSDave Kleikamp * 1632ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 1633ac27a0ecSDave Kleikamp * a negative error number on errors. 1634ac27a0ecSDave Kleikamp */ 1635ac27a0ecSDave Kleikamp static int 1636617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 1637617ba13bSMingming Cao struct ext4_xattr_header *header2) 1638ac27a0ecSDave Kleikamp { 1639617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 1640ac27a0ecSDave Kleikamp 1641ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 1642ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 1643ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 1644ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 1645ac27a0ecSDave Kleikamp return 1; 1646ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 1647ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 1648ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 1649ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 1650ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 1651ac27a0ecSDave Kleikamp return 1; 1652ac27a0ecSDave Kleikamp if (entry1->e_value_block != 0 || entry2->e_value_block != 0) 16536a797d27SDarrick J. Wong return -EFSCORRUPTED; 1654ac27a0ecSDave Kleikamp if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 1655ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 1656ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 1657ac27a0ecSDave Kleikamp return 1; 1658ac27a0ecSDave Kleikamp 1659617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 1660617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 1661ac27a0ecSDave Kleikamp } 1662ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 1663ac27a0ecSDave Kleikamp return 1; 1664ac27a0ecSDave Kleikamp return 0; 1665ac27a0ecSDave Kleikamp } 1666ac27a0ecSDave Kleikamp 1667ac27a0ecSDave Kleikamp /* 1668617ba13bSMingming Cao * ext4_xattr_cache_find() 1669ac27a0ecSDave Kleikamp * 1670ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 1671ac27a0ecSDave Kleikamp * 1672ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 1673ac27a0ecSDave Kleikamp * not found or an error occurred. 1674ac27a0ecSDave Kleikamp */ 1675ac27a0ecSDave Kleikamp static struct buffer_head * 1676617ba13bSMingming Cao ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, 16777a2508e1SJan Kara struct mb_cache_entry **pce) 1678ac27a0ecSDave Kleikamp { 1679ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 16807a2508e1SJan Kara struct mb_cache_entry *ce; 16817a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 1682ac27a0ecSDave Kleikamp 1683ac27a0ecSDave Kleikamp if (!header->h_hash) 1684ac27a0ecSDave Kleikamp return NULL; /* never share */ 1685ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 16867a2508e1SJan Kara ce = mb_cache_entry_find_first(ext4_mb_cache, hash); 1687ac27a0ecSDave Kleikamp while (ce) { 1688ac27a0ecSDave Kleikamp struct buffer_head *bh; 1689ac27a0ecSDave Kleikamp 1690ac27a0ecSDave Kleikamp bh = sb_bread(inode->i_sb, ce->e_block); 1691ac27a0ecSDave Kleikamp if (!bh) { 169224676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 169324676da4STheodore Ts'o (unsigned long) ce->e_block); 1694617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 1695ac27a0ecSDave Kleikamp *pce = ce; 1696ac27a0ecSDave Kleikamp return bh; 1697ac27a0ecSDave Kleikamp } 1698ac27a0ecSDave Kleikamp brelse(bh); 16997a2508e1SJan Kara ce = mb_cache_entry_find_next(ext4_mb_cache, ce); 1700ac27a0ecSDave Kleikamp } 1701ac27a0ecSDave Kleikamp return NULL; 1702ac27a0ecSDave Kleikamp } 1703ac27a0ecSDave Kleikamp 1704ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 1705ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 1706ac27a0ecSDave Kleikamp 1707ac27a0ecSDave Kleikamp /* 1708617ba13bSMingming Cao * ext4_xattr_hash_entry() 1709ac27a0ecSDave Kleikamp * 1710ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 1711ac27a0ecSDave Kleikamp */ 1712617ba13bSMingming Cao static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, 1713617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1714ac27a0ecSDave Kleikamp { 1715ac27a0ecSDave Kleikamp __u32 hash = 0; 1716ac27a0ecSDave Kleikamp char *name = entry->e_name; 1717ac27a0ecSDave Kleikamp int n; 1718ac27a0ecSDave Kleikamp 1719ac27a0ecSDave Kleikamp for (n = 0; n < entry->e_name_len; n++) { 1720ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 1721ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 1722ac27a0ecSDave Kleikamp *name++; 1723ac27a0ecSDave Kleikamp } 1724ac27a0ecSDave Kleikamp 17251cba4237SJan Kara if (entry->e_value_size != 0) { 1726ac27a0ecSDave Kleikamp __le32 *value = (__le32 *)((char *)header + 1727ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs)); 1728ac27a0ecSDave Kleikamp for (n = (le32_to_cpu(entry->e_value_size) + 1729617ba13bSMingming Cao EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { 1730ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 1731ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 1732ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 1733ac27a0ecSDave Kleikamp } 1734ac27a0ecSDave Kleikamp } 1735ac27a0ecSDave Kleikamp entry->e_hash = cpu_to_le32(hash); 1736ac27a0ecSDave Kleikamp } 1737ac27a0ecSDave Kleikamp 1738ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 1739ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 1740ac27a0ecSDave Kleikamp 1741ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 1742ac27a0ecSDave Kleikamp 1743ac27a0ecSDave Kleikamp /* 1744617ba13bSMingming Cao * ext4_xattr_rehash() 1745ac27a0ecSDave Kleikamp * 1746ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 1747ac27a0ecSDave Kleikamp */ 1748617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *header, 1749617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1750ac27a0ecSDave Kleikamp { 1751617ba13bSMingming Cao struct ext4_xattr_entry *here; 1752ac27a0ecSDave Kleikamp __u32 hash = 0; 1753ac27a0ecSDave Kleikamp 1754617ba13bSMingming Cao ext4_xattr_hash_entry(header, entry); 1755ac27a0ecSDave Kleikamp here = ENTRY(header+1); 1756ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 1757ac27a0ecSDave Kleikamp if (!here->e_hash) { 1758ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 1759ac27a0ecSDave Kleikamp hash = 0; 1760ac27a0ecSDave Kleikamp break; 1761ac27a0ecSDave Kleikamp } 1762ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 1763ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 1764ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 1765617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 1766ac27a0ecSDave Kleikamp } 1767ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 1768ac27a0ecSDave Kleikamp } 1769ac27a0ecSDave Kleikamp 1770ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 1771ac27a0ecSDave Kleikamp 17729c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 17739c191f70ST Makphaibulchoke 17747a2508e1SJan Kara struct mb_cache * 177582939d79SJan Kara ext4_xattr_create_cache(void) 1776ac27a0ecSDave Kleikamp { 17777a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 1778ac27a0ecSDave Kleikamp } 1779ac27a0ecSDave Kleikamp 17807a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 1781ac27a0ecSDave Kleikamp { 17829c191f70ST Makphaibulchoke if (cache) 17837a2508e1SJan Kara mb_cache_destroy(cache); 1784ac27a0ecSDave Kleikamp } 17859c191f70ST Makphaibulchoke 1786