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 11033d201e0STahsin Erdogan #ifdef CONFIG_LOCKDEP 11133d201e0STahsin Erdogan void ext4_xattr_inode_set_class(struct inode *ea_inode) 11233d201e0STahsin Erdogan { 11333d201e0STahsin Erdogan lockdep_set_subclass(&ea_inode->i_rwsem, 1); 11433d201e0STahsin Erdogan } 11533d201e0STahsin Erdogan #endif 11633d201e0STahsin Erdogan 117cc8e94fdSDarrick J. Wong static __le32 ext4_xattr_block_csum(struct inode *inode, 118cc8e94fdSDarrick J. Wong sector_t block_nr, 119cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 120cc8e94fdSDarrick J. Wong { 121cc8e94fdSDarrick J. Wong struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 122d6a77105STheodore Ts'o __u32 csum; 123d6a77105STheodore Ts'o __le64 dsk_block_nr = cpu_to_le64(block_nr); 124b47820edSDaeho Jeong __u32 dummy_csum = 0; 125b47820edSDaeho Jeong int offset = offsetof(struct ext4_xattr_header, h_checksum); 126cc8e94fdSDarrick J. Wong 127d6a77105STheodore Ts'o csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, 128d6a77105STheodore Ts'o sizeof(dsk_block_nr)); 129b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); 130b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); 131b47820edSDaeho Jeong offset += sizeof(dummy_csum); 132b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, 133b47820edSDaeho Jeong EXT4_BLOCK_SIZE(inode->i_sb) - offset); 13441eb70ddSTao Ma 135cc8e94fdSDarrick J. Wong return cpu_to_le32(csum); 136cc8e94fdSDarrick J. Wong } 137cc8e94fdSDarrick J. Wong 138cc8e94fdSDarrick J. Wong static int ext4_xattr_block_csum_verify(struct inode *inode, 139dac7a4b4STheodore Ts'o struct buffer_head *bh) 140cc8e94fdSDarrick J. Wong { 141dac7a4b4STheodore Ts'o struct ext4_xattr_header *hdr = BHDR(bh); 142dac7a4b4STheodore Ts'o int ret = 1; 143dac7a4b4STheodore Ts'o 144dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) { 145dac7a4b4STheodore Ts'o lock_buffer(bh); 146dac7a4b4STheodore Ts'o ret = (hdr->h_checksum == ext4_xattr_block_csum(inode, 147dac7a4b4STheodore Ts'o bh->b_blocknr, hdr)); 148dac7a4b4STheodore Ts'o unlock_buffer(bh); 149dac7a4b4STheodore Ts'o } 150dac7a4b4STheodore Ts'o return ret; 151cc8e94fdSDarrick J. Wong } 152cc8e94fdSDarrick J. Wong 153cc8e94fdSDarrick J. Wong static void ext4_xattr_block_csum_set(struct inode *inode, 154cc8e94fdSDarrick J. Wong struct buffer_head *bh) 155cc8e94fdSDarrick J. Wong { 156dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) 157dac7a4b4STheodore Ts'o BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode, 158dac7a4b4STheodore Ts'o bh->b_blocknr, BHDR(bh)); 159cc8e94fdSDarrick J. Wong } 160cc8e94fdSDarrick J. Wong 16111e27528SStephen Hemminger static inline const struct xattr_handler * 162617ba13bSMingming Cao ext4_xattr_handler(int name_index) 163ac27a0ecSDave Kleikamp { 16411e27528SStephen Hemminger const struct xattr_handler *handler = NULL; 165ac27a0ecSDave Kleikamp 166617ba13bSMingming Cao if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) 167617ba13bSMingming Cao handler = ext4_xattr_handler_map[name_index]; 168ac27a0ecSDave Kleikamp return handler; 169ac27a0ecSDave Kleikamp } 170ac27a0ecSDave Kleikamp 171ac27a0ecSDave Kleikamp static int 1722c4f9923SEric Biggers ext4_xattr_check_entries(struct ext4_xattr_entry *entry, void *end, 173a0626e75SDarrick J. Wong void *value_start) 174ac27a0ecSDave Kleikamp { 175a0626e75SDarrick J. Wong struct ext4_xattr_entry *e = entry; 176a0626e75SDarrick J. Wong 177d7614cc1SEric Biggers /* Find the end of the names list */ 178a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(e)) { 179a0626e75SDarrick J. Wong struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); 180ac27a0ecSDave Kleikamp if ((void *)next >= end) 1816a797d27SDarrick J. Wong return -EFSCORRUPTED; 182a0626e75SDarrick J. Wong e = next; 183ac27a0ecSDave Kleikamp } 184a0626e75SDarrick J. Wong 185d7614cc1SEric Biggers /* Check the values */ 186a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(entry)) { 187e50e5129SAndreas Dilger if (entry->e_value_size != 0 && 188e50e5129SAndreas Dilger entry->e_value_inum == 0) { 189d7614cc1SEric Biggers u16 offs = le16_to_cpu(entry->e_value_offs); 190d7614cc1SEric Biggers u32 size = le32_to_cpu(entry->e_value_size); 191d7614cc1SEric Biggers void *value; 192d7614cc1SEric Biggers 193d7614cc1SEric Biggers /* 194d7614cc1SEric Biggers * The value cannot overlap the names, and the value 195d7614cc1SEric Biggers * with padding cannot extend beyond 'end'. Check both 196d7614cc1SEric Biggers * the padded and unpadded sizes, since the size may 197d7614cc1SEric Biggers * overflow to 0 when adding padding. 198d7614cc1SEric Biggers */ 199d7614cc1SEric Biggers if (offs > end - value_start) 2006a797d27SDarrick J. Wong return -EFSCORRUPTED; 201d7614cc1SEric Biggers value = value_start + offs; 202d7614cc1SEric Biggers if (value < (void *)e + sizeof(u32) || 203d7614cc1SEric Biggers size > end - value || 204d7614cc1SEric Biggers EXT4_XATTR_SIZE(size) > end - value) 205d7614cc1SEric Biggers return -EFSCORRUPTED; 206d7614cc1SEric Biggers } 207a0626e75SDarrick J. Wong entry = EXT4_XATTR_NEXT(entry); 208a0626e75SDarrick J. Wong } 209a0626e75SDarrick J. Wong 210ac27a0ecSDave Kleikamp return 0; 211ac27a0ecSDave Kleikamp } 212ac27a0ecSDave Kleikamp 213ac27a0ecSDave Kleikamp static inline int 214cc8e94fdSDarrick J. Wong ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) 215ac27a0ecSDave Kleikamp { 216cc8e94fdSDarrick J. Wong int error; 217cc8e94fdSDarrick J. Wong 218cc8e94fdSDarrick J. Wong if (buffer_verified(bh)) 219cc8e94fdSDarrick J. Wong return 0; 220cc8e94fdSDarrick J. Wong 221617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 222ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) 2236a797d27SDarrick J. Wong return -EFSCORRUPTED; 224dac7a4b4STheodore Ts'o if (!ext4_xattr_block_csum_verify(inode, bh)) 2256a797d27SDarrick J. Wong return -EFSBADCRC; 2262c4f9923SEric Biggers error = ext4_xattr_check_entries(BFIRST(bh), bh->b_data + bh->b_size, 227a0626e75SDarrick J. Wong bh->b_data); 228cc8e94fdSDarrick J. Wong if (!error) 229cc8e94fdSDarrick J. Wong set_buffer_verified(bh); 230cc8e94fdSDarrick J. Wong return error; 231ac27a0ecSDave Kleikamp } 232ac27a0ecSDave Kleikamp 2339e92f48cSTheodore Ts'o static int 2349e92f48cSTheodore Ts'o __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, 2359e92f48cSTheodore Ts'o void *end, const char *function, unsigned int line) 2369e92f48cSTheodore Ts'o { 2379e92f48cSTheodore Ts'o int error = -EFSCORRUPTED; 2389e92f48cSTheodore Ts'o 239290ab230SEric Biggers if (end - (void *)header < sizeof(*header) + sizeof(u32) || 24019962509SEric Biggers (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) 2419e92f48cSTheodore Ts'o goto errout; 2422c4f9923SEric Biggers error = ext4_xattr_check_entries(IFIRST(header), end, IFIRST(header)); 2439e92f48cSTheodore Ts'o errout: 2449e92f48cSTheodore Ts'o if (error) 2459e92f48cSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, 2469e92f48cSTheodore Ts'o "corrupted in-inode xattr"); 2479e92f48cSTheodore Ts'o return error; 2489e92f48cSTheodore Ts'o } 2499e92f48cSTheodore Ts'o 2509e92f48cSTheodore Ts'o #define xattr_check_inode(inode, header, end) \ 2519e92f48cSTheodore Ts'o __xattr_check_inode((inode), (header), (end), __func__, __LINE__) 2529e92f48cSTheodore Ts'o 253ac27a0ecSDave Kleikamp static int 254617ba13bSMingming Cao ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, 2556ba644b9SEric Biggers const char *name, int sorted) 256ac27a0ecSDave Kleikamp { 257617ba13bSMingming Cao struct ext4_xattr_entry *entry; 258ac27a0ecSDave Kleikamp size_t name_len; 259ac27a0ecSDave Kleikamp int cmp = 1; 260ac27a0ecSDave Kleikamp 261ac27a0ecSDave Kleikamp if (name == NULL) 262ac27a0ecSDave Kleikamp return -EINVAL; 263ac27a0ecSDave Kleikamp name_len = strlen(name); 264ac27a0ecSDave Kleikamp entry = *pentry; 265617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 266ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 267ac27a0ecSDave Kleikamp if (!cmp) 268ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 269ac27a0ecSDave Kleikamp if (!cmp) 270ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 271ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 272ac27a0ecSDave Kleikamp break; 273ac27a0ecSDave Kleikamp } 274ac27a0ecSDave Kleikamp *pentry = entry; 275ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 276ac27a0ecSDave Kleikamp } 277ac27a0ecSDave Kleikamp 278e50e5129SAndreas Dilger /* 279e50e5129SAndreas Dilger * Read the EA value from an inode. 280e50e5129SAndreas Dilger */ 281e50e5129SAndreas Dilger static int 282e50e5129SAndreas Dilger ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t *size) 283e50e5129SAndreas Dilger { 284e50e5129SAndreas Dilger unsigned long block = 0; 285e50e5129SAndreas Dilger struct buffer_head *bh = NULL; 286e50e5129SAndreas Dilger int blocksize; 287e50e5129SAndreas Dilger size_t csize, ret_size = 0; 288e50e5129SAndreas Dilger 289e50e5129SAndreas Dilger if (*size == 0) 290e50e5129SAndreas Dilger return 0; 291e50e5129SAndreas Dilger 292e50e5129SAndreas Dilger blocksize = ea_inode->i_sb->s_blocksize; 293e50e5129SAndreas Dilger 294e50e5129SAndreas Dilger while (ret_size < *size) { 295e50e5129SAndreas Dilger csize = (*size - ret_size) > blocksize ? blocksize : 296e50e5129SAndreas Dilger *size - ret_size; 297e50e5129SAndreas Dilger bh = ext4_bread(NULL, ea_inode, block, 0); 298e50e5129SAndreas Dilger if (IS_ERR(bh)) { 299e50e5129SAndreas Dilger *size = ret_size; 300e50e5129SAndreas Dilger return PTR_ERR(bh); 301e50e5129SAndreas Dilger } 302e50e5129SAndreas Dilger memcpy(buf, bh->b_data, csize); 303e50e5129SAndreas Dilger brelse(bh); 304e50e5129SAndreas Dilger 305e50e5129SAndreas Dilger buf += csize; 306e50e5129SAndreas Dilger block += 1; 307e50e5129SAndreas Dilger ret_size += csize; 308e50e5129SAndreas Dilger } 309e50e5129SAndreas Dilger 310e50e5129SAndreas Dilger *size = ret_size; 311e50e5129SAndreas Dilger 312e50e5129SAndreas Dilger return 0; 313e50e5129SAndreas Dilger } 314e50e5129SAndreas Dilger 315*bab79b04STahsin Erdogan static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, 316*bab79b04STahsin Erdogan struct inode **ea_inode) 317e50e5129SAndreas Dilger { 318*bab79b04STahsin Erdogan struct inode *inode; 319*bab79b04STahsin Erdogan int err; 320e50e5129SAndreas Dilger 321*bab79b04STahsin Erdogan inode = ext4_iget(parent->i_sb, ea_ino); 322*bab79b04STahsin Erdogan if (IS_ERR(inode)) { 323*bab79b04STahsin Erdogan err = PTR_ERR(inode); 324e50e5129SAndreas Dilger ext4_error(parent->i_sb, "error while reading EA inode %lu " 325*bab79b04STahsin Erdogan "err=%d", ea_ino, err); 326*bab79b04STahsin Erdogan return err; 327e50e5129SAndreas Dilger } 328e50e5129SAndreas Dilger 329*bab79b04STahsin Erdogan if (is_bad_inode(inode)) { 330*bab79b04STahsin Erdogan ext4_error(parent->i_sb, "error while reading EA inode %lu " 331*bab79b04STahsin Erdogan "is_bad_inode", ea_ino); 332*bab79b04STahsin Erdogan err = -EIO; 333e50e5129SAndreas Dilger goto error; 334e50e5129SAndreas Dilger } 335e50e5129SAndreas Dilger 336*bab79b04STahsin Erdogan if (EXT4_XATTR_INODE_GET_PARENT(inode) != parent->i_ino || 337*bab79b04STahsin Erdogan inode->i_generation != parent->i_generation) { 338*bab79b04STahsin Erdogan ext4_error(parent->i_sb, "Backpointer from EA inode %lu " 339*bab79b04STahsin Erdogan "to parent is invalid.", ea_ino); 340*bab79b04STahsin Erdogan err = -EINVAL; 341*bab79b04STahsin Erdogan goto error; 342*bab79b04STahsin Erdogan } 343*bab79b04STahsin Erdogan 344*bab79b04STahsin Erdogan if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) { 345e50e5129SAndreas Dilger ext4_error(parent->i_sb, "EA inode %lu does not have " 346e50e5129SAndreas Dilger "EXT4_EA_INODE_FL flag set.\n", ea_ino); 347*bab79b04STahsin Erdogan err = -EINVAL; 348e50e5129SAndreas Dilger goto error; 349e50e5129SAndreas Dilger } 350e50e5129SAndreas Dilger 351*bab79b04STahsin Erdogan *ea_inode = inode; 352*bab79b04STahsin Erdogan return 0; 353e50e5129SAndreas Dilger error: 354*bab79b04STahsin Erdogan iput(inode); 355*bab79b04STahsin Erdogan return err; 356e50e5129SAndreas Dilger } 357e50e5129SAndreas Dilger 358e50e5129SAndreas Dilger /* 359e50e5129SAndreas Dilger * Read the value from the EA inode. 360e50e5129SAndreas Dilger */ 361e50e5129SAndreas Dilger static int 362e50e5129SAndreas Dilger ext4_xattr_inode_get(struct inode *inode, unsigned long ea_ino, void *buffer, 363e50e5129SAndreas Dilger size_t *size) 364e50e5129SAndreas Dilger { 365*bab79b04STahsin Erdogan struct inode *ea_inode; 366*bab79b04STahsin Erdogan int ret; 367e50e5129SAndreas Dilger 368*bab79b04STahsin Erdogan ret = ext4_xattr_inode_iget(inode, ea_ino, &ea_inode); 369*bab79b04STahsin Erdogan if (ret) 370*bab79b04STahsin Erdogan return ret; 371e50e5129SAndreas Dilger 372*bab79b04STahsin Erdogan ret = ext4_xattr_inode_read(ea_inode, buffer, size); 373e50e5129SAndreas Dilger iput(ea_inode); 374e50e5129SAndreas Dilger 375*bab79b04STahsin Erdogan return ret; 376e50e5129SAndreas Dilger } 377e50e5129SAndreas Dilger 378ac27a0ecSDave Kleikamp static int 379617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 380ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 381ac27a0ecSDave Kleikamp { 382ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 383617ba13bSMingming Cao struct ext4_xattr_entry *entry; 384ac27a0ecSDave Kleikamp size_t size; 385ac27a0ecSDave Kleikamp int error; 3867a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 387ac27a0ecSDave Kleikamp 388ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 389ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 390ac27a0ecSDave Kleikamp 391ac27a0ecSDave Kleikamp error = -ENODATA; 392617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 393ac27a0ecSDave Kleikamp goto cleanup; 394ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 395ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 396617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 397ac27a0ecSDave Kleikamp if (!bh) 398ac27a0ecSDave Kleikamp goto cleanup; 399ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 400ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 401cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 40224676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 403617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 4046a797d27SDarrick J. Wong error = -EFSCORRUPTED; 405ac27a0ecSDave Kleikamp goto cleanup; 406ac27a0ecSDave Kleikamp } 4079c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, bh); 408ac27a0ecSDave Kleikamp entry = BFIRST(bh); 4096ba644b9SEric Biggers error = ext4_xattr_find_entry(&entry, name_index, name, 1); 410ac27a0ecSDave Kleikamp if (error) 411ac27a0ecSDave Kleikamp goto cleanup; 412ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 413ac27a0ecSDave Kleikamp if (buffer) { 414ac27a0ecSDave Kleikamp error = -ERANGE; 415ac27a0ecSDave Kleikamp if (size > buffer_size) 416ac27a0ecSDave Kleikamp goto cleanup; 417e50e5129SAndreas Dilger if (entry->e_value_inum) { 418e50e5129SAndreas Dilger error = ext4_xattr_inode_get(inode, 419e50e5129SAndreas Dilger le32_to_cpu(entry->e_value_inum), 420e50e5129SAndreas Dilger buffer, &size); 421e50e5129SAndreas Dilger if (error) 422e50e5129SAndreas Dilger goto cleanup; 423e50e5129SAndreas Dilger } else { 424e50e5129SAndreas Dilger memcpy(buffer, bh->b_data + 425e50e5129SAndreas Dilger le16_to_cpu(entry->e_value_offs), size); 426e50e5129SAndreas Dilger } 427ac27a0ecSDave Kleikamp } 428ac27a0ecSDave Kleikamp error = size; 429ac27a0ecSDave Kleikamp 430ac27a0ecSDave Kleikamp cleanup: 431ac27a0ecSDave Kleikamp brelse(bh); 432ac27a0ecSDave Kleikamp return error; 433ac27a0ecSDave Kleikamp } 434ac27a0ecSDave Kleikamp 435879b3825STao Ma int 436617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 437ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 438ac27a0ecSDave Kleikamp { 439617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 440617ba13bSMingming Cao struct ext4_xattr_entry *entry; 441617ba13bSMingming Cao struct ext4_inode *raw_inode; 442617ba13bSMingming Cao struct ext4_iloc iloc; 443ac27a0ecSDave Kleikamp size_t size; 444ac27a0ecSDave Kleikamp void *end; 445ac27a0ecSDave Kleikamp int error; 446ac27a0ecSDave Kleikamp 44719f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 448ac27a0ecSDave Kleikamp return -ENODATA; 449617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 450ac27a0ecSDave Kleikamp if (error) 451ac27a0ecSDave Kleikamp return error; 452617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 453ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 454617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 4559e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 456ac27a0ecSDave Kleikamp if (error) 457ac27a0ecSDave Kleikamp goto cleanup; 4586ba644b9SEric Biggers entry = IFIRST(header); 4596ba644b9SEric Biggers error = ext4_xattr_find_entry(&entry, name_index, name, 0); 460ac27a0ecSDave Kleikamp if (error) 461ac27a0ecSDave Kleikamp goto cleanup; 462ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 463ac27a0ecSDave Kleikamp if (buffer) { 464ac27a0ecSDave Kleikamp error = -ERANGE; 465ac27a0ecSDave Kleikamp if (size > buffer_size) 466ac27a0ecSDave Kleikamp goto cleanup; 467e50e5129SAndreas Dilger if (entry->e_value_inum) { 468e50e5129SAndreas Dilger error = ext4_xattr_inode_get(inode, 469e50e5129SAndreas Dilger le32_to_cpu(entry->e_value_inum), 470e50e5129SAndreas Dilger buffer, &size); 471e50e5129SAndreas Dilger if (error) 472e50e5129SAndreas Dilger goto cleanup; 473e50e5129SAndreas Dilger } else { 474ac27a0ecSDave Kleikamp memcpy(buffer, (void *)IFIRST(header) + 475ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs), size); 476ac27a0ecSDave Kleikamp } 477e50e5129SAndreas Dilger } 478ac27a0ecSDave Kleikamp error = size; 479ac27a0ecSDave Kleikamp 480ac27a0ecSDave Kleikamp cleanup: 481ac27a0ecSDave Kleikamp brelse(iloc.bh); 482ac27a0ecSDave Kleikamp return error; 483ac27a0ecSDave Kleikamp } 484ac27a0ecSDave Kleikamp 485ac27a0ecSDave Kleikamp /* 486617ba13bSMingming Cao * ext4_xattr_get() 487ac27a0ecSDave Kleikamp * 488ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 489ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 490ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 491ac27a0ecSDave Kleikamp * 492ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 493ac27a0ecSDave Kleikamp * used / required on success. 494ac27a0ecSDave Kleikamp */ 495ac27a0ecSDave Kleikamp int 496617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 497ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 498ac27a0ecSDave Kleikamp { 499ac27a0ecSDave Kleikamp int error; 500ac27a0ecSDave Kleikamp 5010db1ff22STheodore Ts'o if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 5020db1ff22STheodore Ts'o return -EIO; 5030db1ff22STheodore Ts'o 504230b8c1aSZhang Zhen if (strlen(name) > 255) 505230b8c1aSZhang Zhen return -ERANGE; 506230b8c1aSZhang Zhen 507617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 508617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 509ac27a0ecSDave Kleikamp buffer_size); 510ac27a0ecSDave Kleikamp if (error == -ENODATA) 511617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 512ac27a0ecSDave Kleikamp buffer_size); 513617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 514ac27a0ecSDave Kleikamp return error; 515ac27a0ecSDave Kleikamp } 516ac27a0ecSDave Kleikamp 517ac27a0ecSDave Kleikamp static int 518431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 519ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 520ac27a0ecSDave Kleikamp { 521ac27a0ecSDave Kleikamp size_t rest = buffer_size; 522ac27a0ecSDave Kleikamp 523617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 52411e27528SStephen Hemminger const struct xattr_handler *handler = 525617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 526ac27a0ecSDave Kleikamp 527764a5c6bSAndreas Gruenbacher if (handler && (!handler->list || handler->list(dentry))) { 528764a5c6bSAndreas Gruenbacher const char *prefix = handler->prefix ?: handler->name; 529764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 530764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 531764a5c6bSAndreas Gruenbacher 532ac27a0ecSDave Kleikamp if (buffer) { 533ac27a0ecSDave Kleikamp if (size > rest) 534ac27a0ecSDave Kleikamp return -ERANGE; 535764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 536764a5c6bSAndreas Gruenbacher buffer += prefix_len; 537764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 538764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 539764a5c6bSAndreas Gruenbacher *buffer++ = 0; 540ac27a0ecSDave Kleikamp } 541ac27a0ecSDave Kleikamp rest -= size; 542ac27a0ecSDave Kleikamp } 543ac27a0ecSDave Kleikamp } 544764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 545ac27a0ecSDave Kleikamp } 546ac27a0ecSDave Kleikamp 547ac27a0ecSDave Kleikamp static int 548431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 549ac27a0ecSDave Kleikamp { 5502b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 551ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 552ac27a0ecSDave Kleikamp int error; 5537a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 554ac27a0ecSDave Kleikamp 555ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 556ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 557ac27a0ecSDave Kleikamp 558ac27a0ecSDave Kleikamp error = 0; 559617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 560ac27a0ecSDave Kleikamp goto cleanup; 561ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 562ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 563617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 564ac27a0ecSDave Kleikamp error = -EIO; 565ac27a0ecSDave Kleikamp if (!bh) 566ac27a0ecSDave Kleikamp goto cleanup; 567ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 568ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 569cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 57024676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 571617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 5726a797d27SDarrick J. Wong error = -EFSCORRUPTED; 573ac27a0ecSDave Kleikamp goto cleanup; 574ac27a0ecSDave Kleikamp } 5759c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, bh); 576431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); 577ac27a0ecSDave Kleikamp 578ac27a0ecSDave Kleikamp cleanup: 579ac27a0ecSDave Kleikamp brelse(bh); 580ac27a0ecSDave Kleikamp 581ac27a0ecSDave Kleikamp return error; 582ac27a0ecSDave Kleikamp } 583ac27a0ecSDave Kleikamp 584ac27a0ecSDave Kleikamp static int 585431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 586ac27a0ecSDave Kleikamp { 5872b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 588617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 589617ba13bSMingming Cao struct ext4_inode *raw_inode; 590617ba13bSMingming Cao struct ext4_iloc iloc; 591ac27a0ecSDave Kleikamp void *end; 592ac27a0ecSDave Kleikamp int error; 593ac27a0ecSDave Kleikamp 59419f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 595ac27a0ecSDave Kleikamp return 0; 596617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 597ac27a0ecSDave Kleikamp if (error) 598ac27a0ecSDave Kleikamp return error; 599617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 600ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 601617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 6029e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 603ac27a0ecSDave Kleikamp if (error) 604ac27a0ecSDave Kleikamp goto cleanup; 605431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 606ac27a0ecSDave Kleikamp buffer, buffer_size); 607ac27a0ecSDave Kleikamp 608ac27a0ecSDave Kleikamp cleanup: 609ac27a0ecSDave Kleikamp brelse(iloc.bh); 610ac27a0ecSDave Kleikamp return error; 611ac27a0ecSDave Kleikamp } 612ac27a0ecSDave Kleikamp 613ac27a0ecSDave Kleikamp /* 614ba7ea1d8SEric Biggers * Inode operation listxattr() 615ba7ea1d8SEric Biggers * 616ba7ea1d8SEric Biggers * d_inode(dentry)->i_rwsem: don't care 617ac27a0ecSDave Kleikamp * 618ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 619ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 620ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 621ac27a0ecSDave Kleikamp * 622ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 623ac27a0ecSDave Kleikamp * used / required on success. 624ac27a0ecSDave Kleikamp */ 625ba7ea1d8SEric Biggers ssize_t 626ba7ea1d8SEric Biggers ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) 627ac27a0ecSDave Kleikamp { 628eaeef867STheodore Ts'o int ret, ret2; 629ac27a0ecSDave Kleikamp 6302b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 631eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 632eaeef867STheodore Ts'o if (ret < 0) 633eaeef867STheodore Ts'o goto errout; 634ac27a0ecSDave Kleikamp if (buffer) { 635eaeef867STheodore Ts'o buffer += ret; 636eaeef867STheodore Ts'o buffer_size -= ret; 637ac27a0ecSDave Kleikamp } 638eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 639eaeef867STheodore Ts'o if (ret < 0) 640eaeef867STheodore Ts'o goto errout; 641eaeef867STheodore Ts'o ret += ret2; 642eaeef867STheodore Ts'o errout: 6432b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 644eaeef867STheodore Ts'o return ret; 645ac27a0ecSDave Kleikamp } 646ac27a0ecSDave Kleikamp 647ac27a0ecSDave Kleikamp /* 648617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 649ac27a0ecSDave Kleikamp * not set, set it. 650ac27a0ecSDave Kleikamp */ 651617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 652ac27a0ecSDave Kleikamp struct super_block *sb) 653ac27a0ecSDave Kleikamp { 654e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 655ac27a0ecSDave Kleikamp return; 656ac27a0ecSDave Kleikamp 6575d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 658617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 659e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 660a0375156STheodore Ts'o ext4_handle_dirty_super(handle, sb); 661ac27a0ecSDave Kleikamp } 662ac27a0ecSDave Kleikamp } 663ac27a0ecSDave Kleikamp 664ac27a0ecSDave Kleikamp /* 665ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 666ec4cb1aaSJan Kara * otherwise free the block. 667ac27a0ecSDave Kleikamp */ 668ac27a0ecSDave Kleikamp static void 669617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 670ac27a0ecSDave Kleikamp struct buffer_head *bh) 671ac27a0ecSDave Kleikamp { 6726048c64bSAndreas Gruenbacher struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 6736048c64bSAndreas Gruenbacher u32 hash, ref; 6748a2bfdcbSMingming Cao int error = 0; 675ac27a0ecSDave Kleikamp 6765d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 6778a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 6788a2bfdcbSMingming Cao if (error) 6798a2bfdcbSMingming Cao goto out; 6808a2bfdcbSMingming Cao 6818a2bfdcbSMingming Cao lock_buffer(bh); 6826048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 6836048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 6846048c64bSAndreas Gruenbacher if (ref == 1) { 685ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 68682939d79SJan Kara /* 68782939d79SJan Kara * This must happen under buffer lock for 68882939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 68982939d79SJan Kara */ 6906048c64bSAndreas Gruenbacher mb_cache_entry_delete_block(ext4_mb_cache, hash, bh->b_blocknr); 691ac27a0ecSDave Kleikamp get_bh(bh); 692ec4cb1aaSJan Kara unlock_buffer(bh); 693e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 694e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 695e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 696ac27a0ecSDave Kleikamp } else { 6976048c64bSAndreas Gruenbacher ref--; 6986048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 6996048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 7006048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 7016048c64bSAndreas Gruenbacher 7026048c64bSAndreas Gruenbacher ce = mb_cache_entry_get(ext4_mb_cache, hash, 7036048c64bSAndreas Gruenbacher bh->b_blocknr); 7046048c64bSAndreas Gruenbacher if (ce) { 7056048c64bSAndreas Gruenbacher ce->e_reusable = 1; 7066048c64bSAndreas Gruenbacher mb_cache_entry_put(ext4_mb_cache, ce); 7076048c64bSAndreas Gruenbacher } 7086048c64bSAndreas Gruenbacher } 7096048c64bSAndreas Gruenbacher 710dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bh); 711ec4cb1aaSJan Kara /* 712ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 713ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 714ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 715ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 716ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 717dac7a4b4STheodore Ts'o * call ext4_handle_dirty_metadata() with locked buffer as 718ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 719ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 720ec4cb1aaSJan Kara */ 721ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 722dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 723c1bb05a6SEric Sandeen unlock_buffer(bh); 724ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 725dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 726ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 7270390131bSFrank Mayhar ext4_handle_sync(handle); 7281231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 729ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 730ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 731ac27a0ecSDave Kleikamp } 7328a2bfdcbSMingming Cao out: 7338a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 7348a2bfdcbSMingming Cao return; 735ac27a0ecSDave Kleikamp } 736ac27a0ecSDave Kleikamp 7376dd4ee7cSKalpak Shah /* 7386dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 7396dd4ee7cSKalpak Shah * bytes used by EA entries. 7406dd4ee7cSKalpak Shah */ 7416dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 7426dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 7436dd4ee7cSKalpak Shah { 7446dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 745e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 7466dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 7476dd4ee7cSKalpak Shah if (offs < *min_offs) 7486dd4ee7cSKalpak Shah *min_offs = offs; 7496dd4ee7cSKalpak Shah } 7507b1b2c1bSTheodore Ts'o if (total) 7517b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 7526dd4ee7cSKalpak Shah } 7536dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 7546dd4ee7cSKalpak Shah } 7556dd4ee7cSKalpak Shah 756e50e5129SAndreas Dilger /* 757e50e5129SAndreas Dilger * Write the value of the EA in an inode. 758e50e5129SAndreas Dilger */ 759e50e5129SAndreas Dilger static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, 760e50e5129SAndreas Dilger const void *buf, int bufsize) 761e50e5129SAndreas Dilger { 762e50e5129SAndreas Dilger struct buffer_head *bh = NULL; 763e50e5129SAndreas Dilger unsigned long block = 0; 764e50e5129SAndreas Dilger unsigned blocksize = ea_inode->i_sb->s_blocksize; 765e50e5129SAndreas Dilger unsigned max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; 766e50e5129SAndreas Dilger int csize, wsize = 0; 767e50e5129SAndreas Dilger int ret = 0; 768e50e5129SAndreas Dilger int retries = 0; 769e50e5129SAndreas Dilger 770e50e5129SAndreas Dilger retry: 771e50e5129SAndreas Dilger while (ret >= 0 && ret < max_blocks) { 772e50e5129SAndreas Dilger struct ext4_map_blocks map; 773e50e5129SAndreas Dilger map.m_lblk = block += ret; 774e50e5129SAndreas Dilger map.m_len = max_blocks -= ret; 775e50e5129SAndreas Dilger 776e50e5129SAndreas Dilger ret = ext4_map_blocks(handle, ea_inode, &map, 777e50e5129SAndreas Dilger EXT4_GET_BLOCKS_CREATE); 778e50e5129SAndreas Dilger if (ret <= 0) { 779e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 780e50e5129SAndreas Dilger if (ret == -ENOSPC && 781e50e5129SAndreas Dilger ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { 782e50e5129SAndreas Dilger ret = 0; 783e50e5129SAndreas Dilger goto retry; 784e50e5129SAndreas Dilger } 785e50e5129SAndreas Dilger break; 786e50e5129SAndreas Dilger } 787e50e5129SAndreas Dilger } 788e50e5129SAndreas Dilger 789e50e5129SAndreas Dilger if (ret < 0) 790e50e5129SAndreas Dilger return ret; 791e50e5129SAndreas Dilger 792e50e5129SAndreas Dilger block = 0; 793e50e5129SAndreas Dilger while (wsize < bufsize) { 794e50e5129SAndreas Dilger if (bh != NULL) 795e50e5129SAndreas Dilger brelse(bh); 796e50e5129SAndreas Dilger csize = (bufsize - wsize) > blocksize ? blocksize : 797e50e5129SAndreas Dilger bufsize - wsize; 798e50e5129SAndreas Dilger bh = ext4_getblk(handle, ea_inode, block, 0); 799e50e5129SAndreas Dilger if (IS_ERR(bh)) 800e50e5129SAndreas Dilger return PTR_ERR(bh); 801e50e5129SAndreas Dilger ret = ext4_journal_get_write_access(handle, bh); 802e50e5129SAndreas Dilger if (ret) 803e50e5129SAndreas Dilger goto out; 804e50e5129SAndreas Dilger 805e50e5129SAndreas Dilger memcpy(bh->b_data, buf, csize); 806e50e5129SAndreas Dilger set_buffer_uptodate(bh); 807e50e5129SAndreas Dilger ext4_handle_dirty_metadata(handle, ea_inode, bh); 808e50e5129SAndreas Dilger 809e50e5129SAndreas Dilger buf += csize; 810e50e5129SAndreas Dilger wsize += csize; 811e50e5129SAndreas Dilger block += 1; 812e50e5129SAndreas Dilger } 813e50e5129SAndreas Dilger 814e50e5129SAndreas Dilger inode_lock(ea_inode); 815e50e5129SAndreas Dilger i_size_write(ea_inode, wsize); 816e50e5129SAndreas Dilger ext4_update_i_disksize(ea_inode, wsize); 817e50e5129SAndreas Dilger inode_unlock(ea_inode); 818e50e5129SAndreas Dilger 819e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 820e50e5129SAndreas Dilger 821e50e5129SAndreas Dilger out: 822e50e5129SAndreas Dilger brelse(bh); 823e50e5129SAndreas Dilger 824e50e5129SAndreas Dilger return ret; 825e50e5129SAndreas Dilger } 826e50e5129SAndreas Dilger 827e50e5129SAndreas Dilger /* 828e50e5129SAndreas Dilger * Create an inode to store the value of a large EA. 829e50e5129SAndreas Dilger */ 830e50e5129SAndreas Dilger static struct inode *ext4_xattr_inode_create(handle_t *handle, 831e50e5129SAndreas Dilger struct inode *inode) 832e50e5129SAndreas Dilger { 833e50e5129SAndreas Dilger struct inode *ea_inode = NULL; 8349e1ba001STahsin Erdogan uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; 835bd3b963bSTahsin Erdogan int err; 836e50e5129SAndreas Dilger 837e50e5129SAndreas Dilger /* 838e50e5129SAndreas Dilger * Let the next inode be the goal, so we try and allocate the EA inode 839e50e5129SAndreas Dilger * in the same group, or nearby one. 840e50e5129SAndreas Dilger */ 841e50e5129SAndreas Dilger ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, 8429e1ba001STahsin Erdogan S_IFREG | 0600, NULL, inode->i_ino + 1, owner, 8431b917ed8STahsin Erdogan EXT4_EA_INODE_FL); 844e50e5129SAndreas Dilger if (!IS_ERR(ea_inode)) { 845e50e5129SAndreas Dilger ea_inode->i_op = &ext4_file_inode_operations; 846e50e5129SAndreas Dilger ea_inode->i_fop = &ext4_file_operations; 847e50e5129SAndreas Dilger ext4_set_aops(ea_inode); 84833d201e0STahsin Erdogan ext4_xattr_inode_set_class(ea_inode); 849e50e5129SAndreas Dilger ea_inode->i_generation = inode->i_generation; 850e50e5129SAndreas Dilger EXT4_I(ea_inode)->i_flags |= EXT4_EA_INODE_FL; 851e50e5129SAndreas Dilger 852e50e5129SAndreas Dilger /* 853e50e5129SAndreas Dilger * A back-pointer from EA inode to parent inode will be useful 854e50e5129SAndreas Dilger * for e2fsck. 855e50e5129SAndreas Dilger */ 856e50e5129SAndreas Dilger EXT4_XATTR_INODE_SET_PARENT(ea_inode, inode->i_ino); 857e50e5129SAndreas Dilger unlock_new_inode(ea_inode); 858bd3b963bSTahsin Erdogan err = ext4_inode_attach_jinode(ea_inode); 859bd3b963bSTahsin Erdogan if (err) { 860bd3b963bSTahsin Erdogan iput(ea_inode); 861bd3b963bSTahsin Erdogan return ERR_PTR(err); 862bd3b963bSTahsin Erdogan } 863e50e5129SAndreas Dilger } 864e50e5129SAndreas Dilger 865e50e5129SAndreas Dilger return ea_inode; 866e50e5129SAndreas Dilger } 867e50e5129SAndreas Dilger 868e50e5129SAndreas Dilger /* 869e50e5129SAndreas Dilger * Unlink the inode storing the value of the EA. 870e50e5129SAndreas Dilger */ 871e50e5129SAndreas Dilger int ext4_xattr_inode_unlink(struct inode *inode, unsigned long ea_ino) 872e50e5129SAndreas Dilger { 873e50e5129SAndreas Dilger struct inode *ea_inode = NULL; 874e50e5129SAndreas Dilger int err; 875e50e5129SAndreas Dilger 876*bab79b04STahsin Erdogan err = ext4_xattr_inode_iget(inode, ea_ino, &ea_inode); 877e50e5129SAndreas Dilger if (err) 878e50e5129SAndreas Dilger return err; 879e50e5129SAndreas Dilger 880e50e5129SAndreas Dilger clear_nlink(ea_inode); 881e50e5129SAndreas Dilger iput(ea_inode); 882e50e5129SAndreas Dilger 883e50e5129SAndreas Dilger return 0; 884e50e5129SAndreas Dilger } 885e50e5129SAndreas Dilger 886e50e5129SAndreas Dilger /* 887e50e5129SAndreas Dilger * Add value of the EA in an inode. 888e50e5129SAndreas Dilger */ 889e50e5129SAndreas Dilger static int ext4_xattr_inode_set(handle_t *handle, struct inode *inode, 890e50e5129SAndreas Dilger unsigned long *ea_ino, const void *value, 891e50e5129SAndreas Dilger size_t value_len) 892e50e5129SAndreas Dilger { 893e50e5129SAndreas Dilger struct inode *ea_inode; 894e50e5129SAndreas Dilger int err; 895e50e5129SAndreas Dilger 896e50e5129SAndreas Dilger /* Create an inode for the EA value */ 897e50e5129SAndreas Dilger ea_inode = ext4_xattr_inode_create(handle, inode); 898e50e5129SAndreas Dilger if (IS_ERR(ea_inode)) 899e50e5129SAndreas Dilger return PTR_ERR(ea_inode); 900e50e5129SAndreas Dilger 901e50e5129SAndreas Dilger err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); 902e50e5129SAndreas Dilger if (err) 903e50e5129SAndreas Dilger clear_nlink(ea_inode); 904e50e5129SAndreas Dilger else 905e50e5129SAndreas Dilger *ea_ino = ea_inode->i_ino; 906e50e5129SAndreas Dilger 907e50e5129SAndreas Dilger iput(ea_inode); 908e50e5129SAndreas Dilger 909e50e5129SAndreas Dilger return err; 910e50e5129SAndreas Dilger } 911e50e5129SAndreas Dilger 912e50e5129SAndreas Dilger static int ext4_xattr_set_entry(struct ext4_xattr_info *i, 913e50e5129SAndreas Dilger struct ext4_xattr_search *s, 914e50e5129SAndreas Dilger handle_t *handle, struct inode *inode) 915ac27a0ecSDave Kleikamp { 916617ba13bSMingming Cao struct ext4_xattr_entry *last; 917ac27a0ecSDave Kleikamp size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); 918e50e5129SAndreas Dilger int in_inode = i->in_inode; 919e50e5129SAndreas Dilger int rc; 920e50e5129SAndreas Dilger 921e50e5129SAndreas Dilger if (ext4_has_feature_ea_inode(inode->i_sb) && 922e50e5129SAndreas Dilger (EXT4_XATTR_SIZE(i->value_len) > 923e50e5129SAndreas Dilger EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) 924e50e5129SAndreas Dilger in_inode = 1; 925ac27a0ecSDave Kleikamp 926ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 927ac27a0ecSDave Kleikamp last = s->first; 928617ba13bSMingming Cao for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 929e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 930ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 931ac27a0ecSDave Kleikamp if (offs < min_offs) 932ac27a0ecSDave Kleikamp min_offs = offs; 933ac27a0ecSDave Kleikamp } 934ac27a0ecSDave Kleikamp } 935ac27a0ecSDave Kleikamp free = min_offs - ((void *)last - s->base) - sizeof(__u32); 936ac27a0ecSDave Kleikamp if (!s->not_found) { 937e50e5129SAndreas Dilger if (!in_inode && 938e50e5129SAndreas Dilger !s->here->e_value_inum && s->here->e_value_size) { 939ac27a0ecSDave Kleikamp size_t size = le32_to_cpu(s->here->e_value_size); 940617ba13bSMingming Cao free += EXT4_XATTR_SIZE(size); 941ac27a0ecSDave Kleikamp } 942617ba13bSMingming Cao free += EXT4_XATTR_LEN(name_len); 943ac27a0ecSDave Kleikamp } 944ac27a0ecSDave Kleikamp if (i->value) { 945e50e5129SAndreas Dilger size_t value_len = EXT4_XATTR_SIZE(i->value_len); 946e50e5129SAndreas Dilger 947e50e5129SAndreas Dilger if (in_inode) 948e50e5129SAndreas Dilger value_len = 0; 949e50e5129SAndreas Dilger 950e50e5129SAndreas Dilger if (free < EXT4_XATTR_LEN(name_len) + value_len) 951ac27a0ecSDave Kleikamp return -ENOSPC; 952ac27a0ecSDave Kleikamp } 953ac27a0ecSDave Kleikamp 954ac27a0ecSDave Kleikamp if (i->value && s->not_found) { 955ac27a0ecSDave Kleikamp /* Insert the new name. */ 956617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 957ac27a0ecSDave Kleikamp size_t rest = (void *)last - (void *)s->here + sizeof(__u32); 958ac27a0ecSDave Kleikamp memmove((void *)s->here + size, s->here, rest); 959ac27a0ecSDave Kleikamp memset(s->here, 0, size); 960ac27a0ecSDave Kleikamp s->here->e_name_index = i->name_index; 961ac27a0ecSDave Kleikamp s->here->e_name_len = name_len; 962ac27a0ecSDave Kleikamp memcpy(s->here->e_name, i->name, name_len); 963ac27a0ecSDave Kleikamp } else { 964e50e5129SAndreas Dilger if (!s->here->e_value_inum && s->here->e_value_size && 965e50e5129SAndreas Dilger s->here->e_value_offs > 0) { 966ac27a0ecSDave Kleikamp void *first_val = s->base + min_offs; 967ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(s->here->e_value_offs); 968ac27a0ecSDave Kleikamp void *val = s->base + offs; 969617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE( 970ac27a0ecSDave Kleikamp le32_to_cpu(s->here->e_value_size)); 971ac27a0ecSDave Kleikamp 972617ba13bSMingming Cao if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { 973ac27a0ecSDave Kleikamp /* The old and the new value have the same 974ac27a0ecSDave Kleikamp size. Just replace. */ 975ac27a0ecSDave Kleikamp s->here->e_value_size = 976ac27a0ecSDave Kleikamp cpu_to_le32(i->value_len); 977bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 978bd9926e8STheodore Ts'o memset(val, 0, size); 979bd9926e8STheodore Ts'o } else { 980bd9926e8STheodore Ts'o /* Clear pad bytes first. */ 981617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 982bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 983ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 984bd9926e8STheodore Ts'o } 985ac27a0ecSDave Kleikamp return 0; 986ac27a0ecSDave Kleikamp } 987ac27a0ecSDave Kleikamp 988ac27a0ecSDave Kleikamp /* Remove the old value. */ 989ac27a0ecSDave Kleikamp memmove(first_val + size, first_val, val - first_val); 990ac27a0ecSDave Kleikamp memset(first_val, 0, size); 991ac27a0ecSDave Kleikamp s->here->e_value_size = 0; 992ac27a0ecSDave Kleikamp s->here->e_value_offs = 0; 993ac27a0ecSDave Kleikamp min_offs += size; 994ac27a0ecSDave Kleikamp 995ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 996ac27a0ecSDave Kleikamp last = s->first; 997ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 998ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 999e50e5129SAndreas Dilger if (!last->e_value_inum && 1000e50e5129SAndreas Dilger last->e_value_size && o < offs) 1001ac27a0ecSDave Kleikamp last->e_value_offs = 1002ac27a0ecSDave Kleikamp cpu_to_le16(o + size); 1003617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 1004ac27a0ecSDave Kleikamp } 1005ac27a0ecSDave Kleikamp } 1006e50e5129SAndreas Dilger if (s->here->e_value_inum) { 1007e50e5129SAndreas Dilger ext4_xattr_inode_unlink(inode, 1008e50e5129SAndreas Dilger le32_to_cpu(s->here->e_value_inum)); 1009e50e5129SAndreas Dilger s->here->e_value_inum = 0; 1010e50e5129SAndreas Dilger } 1011ac27a0ecSDave Kleikamp if (!i->value) { 1012ac27a0ecSDave Kleikamp /* Remove the old name. */ 1013617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 1014ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 1015ac27a0ecSDave Kleikamp memmove(s->here, (void *)s->here + size, 1016ac27a0ecSDave Kleikamp (void *)last - (void *)s->here + sizeof(__u32)); 1017ac27a0ecSDave Kleikamp memset(last, 0, size); 1018ac27a0ecSDave Kleikamp } 1019ac27a0ecSDave Kleikamp } 1020ac27a0ecSDave Kleikamp 1021ac27a0ecSDave Kleikamp if (i->value) { 1022ac27a0ecSDave Kleikamp /* Insert the new value. */ 1023e50e5129SAndreas Dilger if (in_inode) { 1024e50e5129SAndreas Dilger unsigned long ea_ino = 1025e50e5129SAndreas Dilger le32_to_cpu(s->here->e_value_inum); 1026e50e5129SAndreas Dilger rc = ext4_xattr_inode_set(handle, inode, &ea_ino, 1027e50e5129SAndreas Dilger i->value, i->value_len); 1028e50e5129SAndreas Dilger if (rc) 1029e50e5129SAndreas Dilger goto out; 1030e50e5129SAndreas Dilger s->here->e_value_inum = cpu_to_le32(ea_ino); 1031e50e5129SAndreas Dilger s->here->e_value_offs = 0; 1032e50e5129SAndreas Dilger } else if (i->value_len) { 1033617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE(i->value_len); 1034ac27a0ecSDave Kleikamp void *val = s->base + min_offs - size; 1035ac27a0ecSDave Kleikamp s->here->e_value_offs = cpu_to_le16(min_offs - size); 1036e50e5129SAndreas Dilger s->here->e_value_inum = 0; 1037bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 1038bd9926e8STheodore Ts'o memset(val, 0, size); 1039bd9926e8STheodore Ts'o } else { 1040bd9926e8STheodore Ts'o /* Clear the pad bytes first. */ 1041617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 1042bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 1043ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 1044ac27a0ecSDave Kleikamp } 1045ac27a0ecSDave Kleikamp } 1046e50e5129SAndreas Dilger s->here->e_value_size = cpu_to_le32(i->value_len); 1047bd9926e8STheodore Ts'o } 1048e50e5129SAndreas Dilger 1049e50e5129SAndreas Dilger out: 1050e50e5129SAndreas Dilger return rc; 1051ac27a0ecSDave Kleikamp } 1052ac27a0ecSDave Kleikamp 1053617ba13bSMingming Cao struct ext4_xattr_block_find { 1054617ba13bSMingming Cao struct ext4_xattr_search s; 1055ac27a0ecSDave Kleikamp struct buffer_head *bh; 1056ac27a0ecSDave Kleikamp }; 1057ac27a0ecSDave Kleikamp 1058ac27a0ecSDave Kleikamp static int 1059617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 1060617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1061ac27a0ecSDave Kleikamp { 1062ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1063ac27a0ecSDave Kleikamp int error; 1064ac27a0ecSDave Kleikamp 1065ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 1066ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 1067ac27a0ecSDave Kleikamp 1068617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 1069ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 1070617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 1071ac27a0ecSDave Kleikamp error = -EIO; 1072ac27a0ecSDave Kleikamp if (!bs->bh) 1073ac27a0ecSDave Kleikamp goto cleanup; 1074ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 1075ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 1076ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 1077cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bs->bh)) { 107824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 107924676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 10806a797d27SDarrick J. Wong error = -EFSCORRUPTED; 1081ac27a0ecSDave Kleikamp goto cleanup; 1082ac27a0ecSDave Kleikamp } 1083ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1084ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 1085ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 1086ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 1087ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 1088617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 10896ba644b9SEric Biggers i->name, 1); 1090ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1091ac27a0ecSDave Kleikamp goto cleanup; 1092ac27a0ecSDave Kleikamp bs->s.not_found = error; 1093ac27a0ecSDave Kleikamp } 1094ac27a0ecSDave Kleikamp error = 0; 1095ac27a0ecSDave Kleikamp 1096ac27a0ecSDave Kleikamp cleanup: 1097ac27a0ecSDave Kleikamp return error; 1098ac27a0ecSDave Kleikamp } 1099ac27a0ecSDave Kleikamp 1100ac27a0ecSDave Kleikamp static int 1101617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 1102617ba13bSMingming Cao struct ext4_xattr_info *i, 1103617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1104ac27a0ecSDave Kleikamp { 1105ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1106ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 1107617ba13bSMingming Cao struct ext4_xattr_search *s = &bs->s; 11087a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 11098a2bfdcbSMingming Cao int error = 0; 11107a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 1111ac27a0ecSDave Kleikamp 1112617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 1113ac27a0ecSDave Kleikamp 1114ac27a0ecSDave Kleikamp if (s->base) { 11155d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 11168a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 11178a2bfdcbSMingming Cao if (error) 11188a2bfdcbSMingming Cao goto cleanup; 11198a2bfdcbSMingming Cao lock_buffer(bs->bh); 11208a2bfdcbSMingming Cao 1121ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 112282939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 112382939d79SJan Kara 112482939d79SJan Kara /* 112582939d79SJan Kara * This must happen under buffer lock for 112682939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 112782939d79SJan Kara * block 112882939d79SJan Kara */ 11297a2508e1SJan Kara mb_cache_entry_delete_block(ext4_mb_cache, hash, 113082939d79SJan Kara bs->bh->b_blocknr); 1131ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 1132e50e5129SAndreas Dilger error = ext4_xattr_set_entry(i, s, handle, inode); 1133ac27a0ecSDave Kleikamp if (!error) { 1134ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 1135617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), 1136ac27a0ecSDave Kleikamp s->here); 11379c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, 11389c191f70ST Makphaibulchoke bs->bh); 1139ac27a0ecSDave Kleikamp } 1140dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bs->bh); 1141ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 11426a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1143ac27a0ecSDave Kleikamp goto bad_block; 1144ac27a0ecSDave Kleikamp if (!error) 1145dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 11460390131bSFrank Mayhar inode, 1147ac27a0ecSDave Kleikamp bs->bh); 1148ac27a0ecSDave Kleikamp if (error) 1149ac27a0ecSDave Kleikamp goto cleanup; 1150ac27a0ecSDave Kleikamp goto inserted; 1151ac27a0ecSDave Kleikamp } else { 1152ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 1153ac27a0ecSDave Kleikamp 11548a2bfdcbSMingming Cao unlock_buffer(bs->bh); 1155ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 1156216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 1157ac27a0ecSDave Kleikamp error = -ENOMEM; 1158ac27a0ecSDave Kleikamp if (s->base == NULL) 1159ac27a0ecSDave Kleikamp goto cleanup; 1160ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 1161ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1162ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1163ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 1164ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 1165ac27a0ecSDave Kleikamp } 1166ac27a0ecSDave Kleikamp } else { 1167ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 1168216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 1169ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 1170ac27a0ecSDave Kleikamp error = -ENOMEM; 1171ac27a0ecSDave Kleikamp if (s->base == NULL) 1172ac27a0ecSDave Kleikamp goto cleanup; 1173617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 1174ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 1175ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1176ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1177ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 1178ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 1179ac27a0ecSDave Kleikamp } 1180ac27a0ecSDave Kleikamp 1181e50e5129SAndreas Dilger error = ext4_xattr_set_entry(i, s, handle, inode); 11826a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1183ac27a0ecSDave Kleikamp goto bad_block; 1184ac27a0ecSDave Kleikamp if (error) 1185ac27a0ecSDave Kleikamp goto cleanup; 1186ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 1187617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), s->here); 1188ac27a0ecSDave Kleikamp 1189ac27a0ecSDave Kleikamp inserted: 1190ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 1191617ba13bSMingming Cao new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); 1192ac27a0ecSDave Kleikamp if (new_bh) { 1193ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 1194ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 1195ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 1196ac27a0ecSDave Kleikamp else { 11976048c64bSAndreas Gruenbacher u32 ref; 11986048c64bSAndreas Gruenbacher 1199b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 1200b8cb5a54STahsin Erdogan 1201ac27a0ecSDave Kleikamp /* The old block is released after updating 1202ac27a0ecSDave Kleikamp the inode. */ 12031231b3a1SLukas Czerner error = dquot_alloc_block(inode, 12041231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 12055dd4056dSChristoph Hellwig if (error) 1206ac27a0ecSDave Kleikamp goto cleanup; 12075d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 1208617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 1209ac27a0ecSDave Kleikamp new_bh); 1210ac27a0ecSDave Kleikamp if (error) 1211ac27a0ecSDave Kleikamp goto cleanup_dquot; 1212ac27a0ecSDave Kleikamp lock_buffer(new_bh); 121382939d79SJan Kara /* 121482939d79SJan Kara * We have to be careful about races with 12156048c64bSAndreas Gruenbacher * freeing, rehashing or adding references to 12166048c64bSAndreas Gruenbacher * xattr block. Once we hold buffer lock xattr 12176048c64bSAndreas Gruenbacher * block's state is stable so we can check 12186048c64bSAndreas Gruenbacher * whether the block got freed / rehashed or 12196048c64bSAndreas Gruenbacher * not. Since we unhash mbcache entry under 12206048c64bSAndreas Gruenbacher * buffer lock when freeing / rehashing xattr 12216048c64bSAndreas Gruenbacher * block, checking whether entry is still 12226048c64bSAndreas Gruenbacher * hashed is reliable. Same rules hold for 12236048c64bSAndreas Gruenbacher * e_reusable handling. 122482939d79SJan Kara */ 12256048c64bSAndreas Gruenbacher if (hlist_bl_unhashed(&ce->e_hash_list) || 12266048c64bSAndreas Gruenbacher !ce->e_reusable) { 122782939d79SJan Kara /* 122882939d79SJan Kara * Undo everything and check mbcache 122982939d79SJan Kara * again. 123082939d79SJan Kara */ 123182939d79SJan Kara unlock_buffer(new_bh); 123282939d79SJan Kara dquot_free_block(inode, 123382939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 123482939d79SJan Kara 1)); 123582939d79SJan Kara brelse(new_bh); 12367a2508e1SJan Kara mb_cache_entry_put(ext4_mb_cache, ce); 123782939d79SJan Kara ce = NULL; 123882939d79SJan Kara new_bh = NULL; 123982939d79SJan Kara goto inserted; 124082939d79SJan Kara } 12416048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 12426048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 12436048c64bSAndreas Gruenbacher if (ref >= EXT4_XATTR_REFCOUNT_MAX) 12446048c64bSAndreas Gruenbacher ce->e_reusable = 0; 1245ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 12466048c64bSAndreas Gruenbacher ref); 1247dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 1248ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 1249dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 12500390131bSFrank Mayhar inode, 1251ac27a0ecSDave Kleikamp new_bh); 1252ac27a0ecSDave Kleikamp if (error) 1253ac27a0ecSDave Kleikamp goto cleanup_dquot; 1254ac27a0ecSDave Kleikamp } 12557a2508e1SJan Kara mb_cache_entry_touch(ext4_mb_cache, ce); 12567a2508e1SJan Kara mb_cache_entry_put(ext4_mb_cache, ce); 1257ac27a0ecSDave Kleikamp ce = NULL; 1258ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 1259ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 1260ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 1261ac27a0ecSDave Kleikamp new_bh = bs->bh; 1262ac27a0ecSDave Kleikamp get_bh(new_bh); 1263ac27a0ecSDave Kleikamp } else { 1264ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 1265fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 1266fb0a387dSEric Sandeen 1267b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 1268b8cb5a54STahsin Erdogan 1269fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 1270d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 1271fb0a387dSEric Sandeen 1272fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 127312e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 1274fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 1275fb0a387dSEric Sandeen 127655f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 127755f020dbSAllison Henderson NULL, &error); 1278ac27a0ecSDave Kleikamp if (error) 1279ac27a0ecSDave Kleikamp goto cleanup; 1280fb0a387dSEric Sandeen 128112e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 1282fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 1283fb0a387dSEric Sandeen 1284ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 1285ace36ad4SJoe Perches (unsigned long long)block); 1286ac27a0ecSDave Kleikamp 1287ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 1288aebf0243SWang Shilong if (unlikely(!new_bh)) { 1289860d21e2STheodore Ts'o error = -ENOMEM; 1290ac27a0ecSDave Kleikamp getblk_failed: 12917dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 1292e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 1293ac27a0ecSDave Kleikamp goto cleanup; 1294ac27a0ecSDave Kleikamp } 1295ac27a0ecSDave Kleikamp lock_buffer(new_bh); 1296617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 1297ac27a0ecSDave Kleikamp if (error) { 1298ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 1299860d21e2STheodore Ts'o error = -EIO; 1300ac27a0ecSDave Kleikamp goto getblk_failed; 1301ac27a0ecSDave Kleikamp } 1302ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 1303dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 1304ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 1305ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 13069c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, new_bh); 1307dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, 1308dac7a4b4STheodore Ts'o new_bh); 1309ac27a0ecSDave Kleikamp if (error) 1310ac27a0ecSDave Kleikamp goto cleanup; 1311ac27a0ecSDave Kleikamp } 1312ac27a0ecSDave Kleikamp } 1313ac27a0ecSDave Kleikamp 1314ac27a0ecSDave Kleikamp /* Update the inode. */ 1315617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 1316ac27a0ecSDave Kleikamp 1317ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 1318ac27a0ecSDave Kleikamp if (bs->bh && bs->bh != new_bh) 1319617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bs->bh); 1320ac27a0ecSDave Kleikamp error = 0; 1321ac27a0ecSDave Kleikamp 1322ac27a0ecSDave Kleikamp cleanup: 1323ac27a0ecSDave Kleikamp if (ce) 13247a2508e1SJan Kara mb_cache_entry_put(ext4_mb_cache, ce); 1325ac27a0ecSDave Kleikamp brelse(new_bh); 1326ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 1327ac27a0ecSDave Kleikamp kfree(s->base); 1328ac27a0ecSDave Kleikamp 1329ac27a0ecSDave Kleikamp return error; 1330ac27a0ecSDave Kleikamp 1331ac27a0ecSDave Kleikamp cleanup_dquot: 13321231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 1333ac27a0ecSDave Kleikamp goto cleanup; 1334ac27a0ecSDave Kleikamp 1335ac27a0ecSDave Kleikamp bad_block: 133624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 133724676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1338ac27a0ecSDave Kleikamp goto cleanup; 1339ac27a0ecSDave Kleikamp 1340ac27a0ecSDave Kleikamp #undef header 1341ac27a0ecSDave Kleikamp } 1342ac27a0ecSDave Kleikamp 1343879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 1344617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 1345ac27a0ecSDave Kleikamp { 1346617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 1347617ba13bSMingming Cao struct ext4_inode *raw_inode; 1348ac27a0ecSDave Kleikamp int error; 1349ac27a0ecSDave Kleikamp 1350617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 1351ac27a0ecSDave Kleikamp return 0; 1352617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 1353ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 1354ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 1355ac27a0ecSDave Kleikamp is->s.here = is->s.first; 1356617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 135719f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 13589e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 1359ac27a0ecSDave Kleikamp if (error) 1360ac27a0ecSDave Kleikamp return error; 1361ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1362617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 13636ba644b9SEric Biggers i->name, 0); 1364ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1365ac27a0ecSDave Kleikamp return error; 1366ac27a0ecSDave Kleikamp is->s.not_found = error; 1367ac27a0ecSDave Kleikamp } 1368ac27a0ecSDave Kleikamp return 0; 1369ac27a0ecSDave Kleikamp } 1370ac27a0ecSDave Kleikamp 13710d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 13720d812f77STao Ma struct ext4_xattr_info *i, 13730d812f77STao Ma struct ext4_xattr_ibody_find *is) 13740d812f77STao Ma { 13750d812f77STao Ma struct ext4_xattr_ibody_header *header; 13760d812f77STao Ma struct ext4_xattr_search *s = &is->s; 13770d812f77STao Ma int error; 13780d812f77STao Ma 13790d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 13800d812f77STao Ma return -ENOSPC; 1381e50e5129SAndreas Dilger error = ext4_xattr_set_entry(i, s, handle, inode); 13820d812f77STao Ma if (error) { 13830d812f77STao Ma if (error == -ENOSPC && 13840d812f77STao Ma ext4_has_inline_data(inode)) { 13850d812f77STao Ma error = ext4_try_to_evict_inline_data(handle, inode, 13860d812f77STao Ma EXT4_XATTR_LEN(strlen(i->name) + 13870d812f77STao Ma EXT4_XATTR_SIZE(i->value_len))); 13880d812f77STao Ma if (error) 13890d812f77STao Ma return error; 13900d812f77STao Ma error = ext4_xattr_ibody_find(inode, i, is); 13910d812f77STao Ma if (error) 13920d812f77STao Ma return error; 1393e50e5129SAndreas Dilger error = ext4_xattr_set_entry(i, s, handle, inode); 13940d812f77STao Ma } 13950d812f77STao Ma if (error) 13960d812f77STao Ma return error; 13970d812f77STao Ma } 13980d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 13990d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 14000d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 14010d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 14020d812f77STao Ma } else { 14030d812f77STao Ma header->h_magic = cpu_to_le32(0); 14040d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 14050d812f77STao Ma } 14060d812f77STao Ma return 0; 14070d812f77STao Ma } 14080d812f77STao Ma 1409e50e5129SAndreas Dilger static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 1410617ba13bSMingming Cao struct ext4_xattr_info *i, 1411617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 1412ac27a0ecSDave Kleikamp { 1413617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 1414617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 1415ac27a0ecSDave Kleikamp int error; 1416ac27a0ecSDave Kleikamp 1417617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 1418ac27a0ecSDave Kleikamp return -ENOSPC; 1419e50e5129SAndreas Dilger error = ext4_xattr_set_entry(i, s, handle, inode); 1420ac27a0ecSDave Kleikamp if (error) 1421ac27a0ecSDave Kleikamp return error; 1422617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 1423ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 1424617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 142519f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 1426ac27a0ecSDave Kleikamp } else { 1427ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 142819f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 1429ac27a0ecSDave Kleikamp } 1430ac27a0ecSDave Kleikamp return 0; 1431ac27a0ecSDave Kleikamp } 1432ac27a0ecSDave Kleikamp 14333fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 14343fd16462SJan Kara struct ext4_xattr_info *i) 14353fd16462SJan Kara { 14363fd16462SJan Kara void *value; 14373fd16462SJan Kara 14383fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 14393fd16462SJan Kara return 0; 14403fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 14413fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 14423fd16462SJan Kara } 14433fd16462SJan Kara 1444ac27a0ecSDave Kleikamp /* 1445617ba13bSMingming Cao * ext4_xattr_set_handle() 1446ac27a0ecSDave Kleikamp * 14476e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 1448ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 1449ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 1450ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 1451ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 1452ac27a0ecSDave Kleikamp * previous to the call, respectively. 1453ac27a0ecSDave Kleikamp * 1454ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1455ac27a0ecSDave Kleikamp */ 1456ac27a0ecSDave Kleikamp int 1457617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 1458ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 1459ac27a0ecSDave Kleikamp int flags) 1460ac27a0ecSDave Kleikamp { 1461617ba13bSMingming Cao struct ext4_xattr_info i = { 1462ac27a0ecSDave Kleikamp .name_index = name_index, 1463ac27a0ecSDave Kleikamp .name = name, 1464ac27a0ecSDave Kleikamp .value = value, 1465ac27a0ecSDave Kleikamp .value_len = value_len, 1466e50e5129SAndreas Dilger .in_inode = 0, 1467ac27a0ecSDave Kleikamp }; 1468617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 1469ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1470ac27a0ecSDave Kleikamp }; 1471617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 1472ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1473ac27a0ecSDave Kleikamp }; 1474c755e251STheodore Ts'o int no_expand; 1475ac27a0ecSDave Kleikamp int error; 1476ac27a0ecSDave Kleikamp 1477ac27a0ecSDave Kleikamp if (!name) 1478ac27a0ecSDave Kleikamp return -EINVAL; 1479ac27a0ecSDave Kleikamp if (strlen(name) > 255) 1480ac27a0ecSDave Kleikamp return -ERANGE; 1481b8cb5a54STahsin Erdogan 1482c755e251STheodore Ts'o ext4_write_lock_xattr(inode, &no_expand); 14834d20c685SKalpak Shah 148466543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 148586ebfd08SEric Sandeen if (error) 148686ebfd08SEric Sandeen goto cleanup; 148786ebfd08SEric Sandeen 148819f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 1489617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 1490617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 149119f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 1492ac27a0ecSDave Kleikamp } 1493ac27a0ecSDave Kleikamp 1494617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 1495ac27a0ecSDave Kleikamp if (error) 1496ac27a0ecSDave Kleikamp goto cleanup; 1497ac27a0ecSDave Kleikamp if (is.s.not_found) 1498617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 1499ac27a0ecSDave Kleikamp if (error) 1500ac27a0ecSDave Kleikamp goto cleanup; 1501ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 1502ac27a0ecSDave Kleikamp error = -ENODATA; 1503ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 1504ac27a0ecSDave Kleikamp goto cleanup; 1505ac27a0ecSDave Kleikamp error = 0; 1506ac27a0ecSDave Kleikamp if (!value) 1507ac27a0ecSDave Kleikamp goto cleanup; 1508ac27a0ecSDave Kleikamp } else { 1509ac27a0ecSDave Kleikamp error = -EEXIST; 1510ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 1511ac27a0ecSDave Kleikamp goto cleanup; 1512ac27a0ecSDave Kleikamp } 1513ac27a0ecSDave Kleikamp if (!value) { 1514ac27a0ecSDave Kleikamp if (!is.s.not_found) 1515e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1516ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 1517617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1518ac27a0ecSDave Kleikamp } else { 15193fd16462SJan Kara error = 0; 15203fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 15213fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 15223fd16462SJan Kara goto cleanup; 15233fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 15243fd16462SJan Kara goto cleanup; 15253fd16462SJan Kara 1526e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1527ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 1528ac27a0ecSDave Kleikamp i.value = NULL; 1529617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1530ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 15317e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 15327e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 15337e01c8e5STiger Yang if (error) 15347e01c8e5STiger Yang goto cleanup; 15357e01c8e5STiger Yang } 1536617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1537e50e5129SAndreas Dilger if (ext4_has_feature_ea_inode(inode->i_sb) && 1538e50e5129SAndreas Dilger error == -ENOSPC) { 1539e50e5129SAndreas Dilger /* xattr not fit to block, store at external 1540e50e5129SAndreas Dilger * inode */ 1541e50e5129SAndreas Dilger i.in_inode = 1; 1542e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, 1543e50e5129SAndreas Dilger &i, &is); 1544e50e5129SAndreas Dilger } 1545ac27a0ecSDave Kleikamp if (error) 1546ac27a0ecSDave Kleikamp goto cleanup; 1547ac27a0ecSDave Kleikamp if (!is.s.not_found) { 1548ac27a0ecSDave Kleikamp i.value = NULL; 1549e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, 1550e50e5129SAndreas Dilger &is); 1551ac27a0ecSDave Kleikamp } 1552ac27a0ecSDave Kleikamp } 1553ac27a0ecSDave Kleikamp } 1554ac27a0ecSDave Kleikamp if (!error) { 1555617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 1556eeca7ea1SDeepa Dinamani inode->i_ctime = current_time(inode); 15576dd4ee7cSKalpak Shah if (!value) 1558c755e251STheodore Ts'o no_expand = 0; 1559617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 1560ac27a0ecSDave Kleikamp /* 1561617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 1562ac27a0ecSDave Kleikamp * error != 0. 1563ac27a0ecSDave Kleikamp */ 1564ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 1565ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 15660390131bSFrank Mayhar ext4_handle_sync(handle); 1567ac27a0ecSDave Kleikamp } 1568ac27a0ecSDave Kleikamp 1569ac27a0ecSDave Kleikamp cleanup: 1570ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 1571ac27a0ecSDave Kleikamp brelse(bs.bh); 1572c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 1573ac27a0ecSDave Kleikamp return error; 1574ac27a0ecSDave Kleikamp } 1575ac27a0ecSDave Kleikamp 1576ac27a0ecSDave Kleikamp /* 1577617ba13bSMingming Cao * ext4_xattr_set() 1578ac27a0ecSDave Kleikamp * 1579617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 1580ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 1581ac27a0ecSDave Kleikamp * 1582ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1583ac27a0ecSDave Kleikamp */ 1584ac27a0ecSDave Kleikamp int 1585617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 1586ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 1587ac27a0ecSDave Kleikamp { 1588ac27a0ecSDave Kleikamp handle_t *handle; 1589e50e5129SAndreas Dilger struct super_block *sb = inode->i_sb; 1590ac27a0ecSDave Kleikamp int error, retries = 0; 159195eaefbdSTheodore Ts'o int credits = ext4_jbd2_credits_xattr(inode); 1592ac27a0ecSDave Kleikamp 1593b8cb5a54STahsin Erdogan error = dquot_initialize(inode); 1594b8cb5a54STahsin Erdogan if (error) 1595b8cb5a54STahsin Erdogan return error; 1596e50e5129SAndreas Dilger 1597e50e5129SAndreas Dilger if ((value_len >= EXT4_XATTR_MIN_LARGE_EA_SIZE(sb->s_blocksize)) && 1598e50e5129SAndreas Dilger ext4_has_feature_ea_inode(sb)) { 1599e50e5129SAndreas Dilger int nrblocks = (value_len + sb->s_blocksize - 1) >> 1600e50e5129SAndreas Dilger sb->s_blocksize_bits; 1601e50e5129SAndreas Dilger 1602e50e5129SAndreas Dilger /* For new inode */ 1603e50e5129SAndreas Dilger credits += EXT4_SINGLEDATA_TRANS_BLOCKS(sb) + 3; 1604e50e5129SAndreas Dilger 1605e50e5129SAndreas Dilger /* For data blocks of EA inode */ 1606e50e5129SAndreas Dilger credits += ext4_meta_trans_blocks(inode, nrblocks, 0); 1607e50e5129SAndreas Dilger } 1608e50e5129SAndreas Dilger 1609ac27a0ecSDave Kleikamp retry: 16109924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 1611ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 1612ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 1613ac27a0ecSDave Kleikamp } else { 1614ac27a0ecSDave Kleikamp int error2; 1615ac27a0ecSDave Kleikamp 1616617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 1617ac27a0ecSDave Kleikamp value, value_len, flags); 1618617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 1619ac27a0ecSDave Kleikamp if (error == -ENOSPC && 1620e50e5129SAndreas Dilger ext4_should_retry_alloc(sb, &retries)) 1621ac27a0ecSDave Kleikamp goto retry; 1622ac27a0ecSDave Kleikamp if (error == 0) 1623ac27a0ecSDave Kleikamp error = error2; 1624ac27a0ecSDave Kleikamp } 1625ac27a0ecSDave Kleikamp 1626ac27a0ecSDave Kleikamp return error; 1627ac27a0ecSDave Kleikamp } 1628ac27a0ecSDave Kleikamp 1629ac27a0ecSDave Kleikamp /* 16306dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 16316dd4ee7cSKalpak Shah * i_extra_isize. 16326dd4ee7cSKalpak Shah */ 16336dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 16346dd4ee7cSKalpak Shah int value_offs_shift, void *to, 163594405713SJan Kara void *from, size_t n) 16366dd4ee7cSKalpak Shah { 16376dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 16386dd4ee7cSKalpak Shah int new_offs; 16396dd4ee7cSKalpak Shah 164094405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 164194405713SJan Kara BUG_ON(value_offs_shift > 0); 164294405713SJan Kara 16436dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 16446dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1645e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 16466dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 16476dd4ee7cSKalpak Shah value_offs_shift; 16486dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 16496dd4ee7cSKalpak Shah } 16506dd4ee7cSKalpak Shah } 16516dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 16526dd4ee7cSKalpak Shah memmove(to, from, n); 16536dd4ee7cSKalpak Shah } 16546dd4ee7cSKalpak Shah 16556dd4ee7cSKalpak Shah /* 16563f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 16573f2571c1SJan Kara */ 16583f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 16593f2571c1SJan Kara struct ext4_inode *raw_inode, 16603f2571c1SJan Kara struct ext4_xattr_entry *entry) 16613f2571c1SJan Kara { 16623f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 16633f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 16643f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 16653f2571c1SJan Kara size_t value_offs, value_size; 16663f2571c1SJan Kara struct ext4_xattr_info i = { 16673f2571c1SJan Kara .value = NULL, 16683f2571c1SJan Kara .value_len = 0, 16693f2571c1SJan Kara .name_index = entry->e_name_index, 16703f2571c1SJan Kara }; 16713f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 16723f2571c1SJan Kara int error; 16733f2571c1SJan Kara 16743f2571c1SJan Kara value_offs = le16_to_cpu(entry->e_value_offs); 16753f2571c1SJan Kara value_size = le32_to_cpu(entry->e_value_size); 16763f2571c1SJan Kara 16773f2571c1SJan Kara is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 16783f2571c1SJan Kara bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 16793f2571c1SJan Kara buffer = kmalloc(value_size, GFP_NOFS); 16803f2571c1SJan Kara b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 16813f2571c1SJan Kara if (!is || !bs || !buffer || !b_entry_name) { 16823f2571c1SJan Kara error = -ENOMEM; 16833f2571c1SJan Kara goto out; 16843f2571c1SJan Kara } 16853f2571c1SJan Kara 16863f2571c1SJan Kara is->s.not_found = -ENODATA; 16873f2571c1SJan Kara bs->s.not_found = -ENODATA; 16883f2571c1SJan Kara is->iloc.bh = NULL; 16893f2571c1SJan Kara bs->bh = NULL; 16903f2571c1SJan Kara 16913f2571c1SJan Kara /* Save the entry name and the entry value */ 16923f2571c1SJan Kara memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); 16933f2571c1SJan Kara memcpy(b_entry_name, entry->e_name, entry->e_name_len); 16943f2571c1SJan Kara b_entry_name[entry->e_name_len] = '\0'; 16953f2571c1SJan Kara i.name = b_entry_name; 16963f2571c1SJan Kara 16973f2571c1SJan Kara error = ext4_get_inode_loc(inode, &is->iloc); 16983f2571c1SJan Kara if (error) 16993f2571c1SJan Kara goto out; 17003f2571c1SJan Kara 17013f2571c1SJan Kara error = ext4_xattr_ibody_find(inode, &i, is); 17023f2571c1SJan Kara if (error) 17033f2571c1SJan Kara goto out; 17043f2571c1SJan Kara 17053f2571c1SJan Kara /* Remove the chosen entry from the inode */ 1706e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, is); 17073f2571c1SJan Kara if (error) 17083f2571c1SJan Kara goto out; 17093f2571c1SJan Kara 17103f2571c1SJan Kara i.name = b_entry_name; 17113f2571c1SJan Kara i.value = buffer; 17123f2571c1SJan Kara i.value_len = value_size; 17133f2571c1SJan Kara error = ext4_xattr_block_find(inode, &i, bs); 17143f2571c1SJan Kara if (error) 17153f2571c1SJan Kara goto out; 17163f2571c1SJan Kara 17173f2571c1SJan Kara /* Add entry which was removed from the inode into the block */ 17183f2571c1SJan Kara error = ext4_xattr_block_set(handle, inode, &i, bs); 17193f2571c1SJan Kara if (error) 17203f2571c1SJan Kara goto out; 17213f2571c1SJan Kara error = 0; 17223f2571c1SJan Kara out: 17233f2571c1SJan Kara kfree(b_entry_name); 17243f2571c1SJan Kara kfree(buffer); 17253f2571c1SJan Kara if (is) 17263f2571c1SJan Kara brelse(is->iloc.bh); 17273f2571c1SJan Kara kfree(is); 17283f2571c1SJan Kara kfree(bs); 17293f2571c1SJan Kara 17303f2571c1SJan Kara return error; 17313f2571c1SJan Kara } 17323f2571c1SJan Kara 1733dfa2064bSJan Kara static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, 1734dfa2064bSJan Kara struct ext4_inode *raw_inode, 1735dfa2064bSJan Kara int isize_diff, size_t ifree, 1736dfa2064bSJan Kara size_t bfree, int *total_ino) 1737dfa2064bSJan Kara { 1738dfa2064bSJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 1739dfa2064bSJan Kara struct ext4_xattr_entry *small_entry; 1740dfa2064bSJan Kara struct ext4_xattr_entry *entry; 1741dfa2064bSJan Kara struct ext4_xattr_entry *last; 1742dfa2064bSJan Kara unsigned int entry_size; /* EA entry size */ 1743dfa2064bSJan Kara unsigned int total_size; /* EA entry size + value size */ 1744dfa2064bSJan Kara unsigned int min_total_size; 1745dfa2064bSJan Kara int error; 1746dfa2064bSJan Kara 1747dfa2064bSJan Kara while (isize_diff > ifree) { 1748dfa2064bSJan Kara entry = NULL; 1749dfa2064bSJan Kara small_entry = NULL; 1750dfa2064bSJan Kara min_total_size = ~0U; 1751dfa2064bSJan Kara last = IFIRST(header); 1752dfa2064bSJan Kara /* Find the entry best suited to be pushed into EA block */ 1753dfa2064bSJan Kara for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1754dfa2064bSJan Kara total_size = 1755dfa2064bSJan Kara EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + 1756dfa2064bSJan Kara EXT4_XATTR_LEN(last->e_name_len); 1757dfa2064bSJan Kara if (total_size <= bfree && 1758dfa2064bSJan Kara total_size < min_total_size) { 1759dfa2064bSJan Kara if (total_size + ifree < isize_diff) { 1760dfa2064bSJan Kara small_entry = last; 1761dfa2064bSJan Kara } else { 1762dfa2064bSJan Kara entry = last; 1763dfa2064bSJan Kara min_total_size = total_size; 1764dfa2064bSJan Kara } 1765dfa2064bSJan Kara } 1766dfa2064bSJan Kara } 1767dfa2064bSJan Kara 1768dfa2064bSJan Kara if (entry == NULL) { 1769dfa2064bSJan Kara if (small_entry == NULL) 1770dfa2064bSJan Kara return -ENOSPC; 1771dfa2064bSJan Kara entry = small_entry; 1772dfa2064bSJan Kara } 1773dfa2064bSJan Kara 1774dfa2064bSJan Kara entry_size = EXT4_XATTR_LEN(entry->e_name_len); 1775dfa2064bSJan Kara total_size = entry_size + 1776dfa2064bSJan Kara EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)); 1777dfa2064bSJan Kara error = ext4_xattr_move_to_block(handle, inode, raw_inode, 1778dfa2064bSJan Kara entry); 1779dfa2064bSJan Kara if (error) 1780dfa2064bSJan Kara return error; 1781dfa2064bSJan Kara 1782dfa2064bSJan Kara *total_ino -= entry_size; 1783dfa2064bSJan Kara ifree += total_size; 1784dfa2064bSJan Kara bfree -= total_size; 1785dfa2064bSJan Kara } 1786dfa2064bSJan Kara 1787dfa2064bSJan Kara return 0; 1788dfa2064bSJan Kara } 1789dfa2064bSJan Kara 17903f2571c1SJan Kara /* 17916dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 17926dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 17936dd4ee7cSKalpak Shah */ 17946dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 17956dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 17966dd4ee7cSKalpak Shah { 17976dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 17986dd4ee7cSKalpak Shah struct buffer_head *bh = NULL; 1799e3014d14SJan Kara size_t min_offs; 1800e3014d14SJan Kara size_t ifree, bfree; 18017b1b2c1bSTheodore Ts'o int total_ino; 18026e0cd088SJan Kara void *base, *end; 1803d0141191SJan Kara int error = 0, tried_min_extra_isize = 0; 1804ac39849dSAneesh Kumar K.V int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); 1805d0141191SJan Kara int isize_diff; /* How much do we need to grow i_extra_isize */ 1806c755e251STheodore Ts'o int no_expand; 18076dd4ee7cSKalpak Shah 1808c755e251STheodore Ts'o if (ext4_write_trylock_xattr(inode, &no_expand) == 0) 1809c755e251STheodore Ts'o return 0; 1810c755e251STheodore Ts'o 18116dd4ee7cSKalpak Shah retry: 1812d0141191SJan Kara isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; 18132e81a4eeSJan Kara if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) 18142e81a4eeSJan Kara goto out; 18156dd4ee7cSKalpak Shah 18166dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 18176dd4ee7cSKalpak Shah 18186dd4ee7cSKalpak Shah /* 18196dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 18206dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 18216dd4ee7cSKalpak Shah */ 18226dd4ee7cSKalpak Shah 18236e0cd088SJan Kara base = IFIRST(header); 18246dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 18256dd4ee7cSKalpak Shah min_offs = end - base; 18266dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 18276dd4ee7cSKalpak Shah 18289e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 18299e92f48cSTheodore Ts'o if (error) 18309e92f48cSTheodore Ts'o goto cleanup; 18319e92f48cSTheodore Ts'o 18326e0cd088SJan Kara ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); 1833e3014d14SJan Kara if (ifree >= isize_diff) 1834e3014d14SJan Kara goto shift; 18356dd4ee7cSKalpak Shah 18366dd4ee7cSKalpak Shah /* 18376dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 18386dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 18396dd4ee7cSKalpak Shah */ 18406dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 18416dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 18426dd4ee7cSKalpak Shah error = -EIO; 18436dd4ee7cSKalpak Shah if (!bh) 18446dd4ee7cSKalpak Shah goto cleanup; 1845cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 184624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 184724676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 18486a797d27SDarrick J. Wong error = -EFSCORRUPTED; 18496dd4ee7cSKalpak Shah goto cleanup; 18506dd4ee7cSKalpak Shah } 18516dd4ee7cSKalpak Shah base = BHDR(bh); 18526dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 18536dd4ee7cSKalpak Shah min_offs = end - base; 18546e0cd088SJan Kara bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, 18556e0cd088SJan Kara NULL); 1856e3014d14SJan Kara if (bfree + ifree < isize_diff) { 18576dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 18586dd4ee7cSKalpak Shah tried_min_extra_isize++; 18596dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 18606dd4ee7cSKalpak Shah brelse(bh); 18616dd4ee7cSKalpak Shah goto retry; 18626dd4ee7cSKalpak Shah } 1863dfa2064bSJan Kara error = -ENOSPC; 18646dd4ee7cSKalpak Shah goto cleanup; 18656dd4ee7cSKalpak Shah } 18666dd4ee7cSKalpak Shah } else { 1867e3014d14SJan Kara bfree = inode->i_sb->s_blocksize; 18686dd4ee7cSKalpak Shah } 18696dd4ee7cSKalpak Shah 1870dfa2064bSJan Kara error = ext4_xattr_make_inode_space(handle, inode, raw_inode, 1871dfa2064bSJan Kara isize_diff, ifree, bfree, 1872dfa2064bSJan Kara &total_ino); 1873dfa2064bSJan Kara if (error) { 1874dfa2064bSJan Kara if (error == -ENOSPC && !tried_min_extra_isize && 18756dd4ee7cSKalpak Shah s_min_extra_isize) { 18766dd4ee7cSKalpak Shah tried_min_extra_isize++; 18776dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 1878dcb9917bSTheodore Ts'o brelse(bh); 18796dd4ee7cSKalpak Shah goto retry; 18806dd4ee7cSKalpak Shah } 18816dd4ee7cSKalpak Shah goto cleanup; 18826dd4ee7cSKalpak Shah } 1883e3014d14SJan Kara shift: 1884e3014d14SJan Kara /* Adjust the offsets and shift the remaining entries ahead */ 18856e0cd088SJan Kara ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize 1886e3014d14SJan Kara - new_extra_isize, (void *)raw_inode + 1887e3014d14SJan Kara EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 188894405713SJan Kara (void *)header, total_ino); 1889e3014d14SJan Kara EXT4_I(inode)->i_extra_isize = new_extra_isize; 18906dd4ee7cSKalpak Shah brelse(bh); 18912e81a4eeSJan Kara out: 1892c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 18936dd4ee7cSKalpak Shah return 0; 18946dd4ee7cSKalpak Shah 18956dd4ee7cSKalpak Shah cleanup: 18966dd4ee7cSKalpak Shah brelse(bh); 18972e81a4eeSJan Kara /* 1898c755e251STheodore Ts'o * Inode size expansion failed; don't try again 18992e81a4eeSJan Kara */ 1900c755e251STheodore Ts'o no_expand = 1; 1901c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 19026dd4ee7cSKalpak Shah return error; 19036dd4ee7cSKalpak Shah } 19046dd4ee7cSKalpak Shah 19056dd4ee7cSKalpak Shah 1906e50e5129SAndreas Dilger #define EIA_INCR 16 /* must be 2^n */ 1907e50e5129SAndreas Dilger #define EIA_MASK (EIA_INCR - 1) 1908e50e5129SAndreas Dilger /* Add the large xattr @ino into @lea_ino_array for later deletion. 1909e50e5129SAndreas Dilger * If @lea_ino_array is new or full it will be grown and the old 1910e50e5129SAndreas Dilger * contents copied over. 1911e50e5129SAndreas Dilger */ 1912e50e5129SAndreas Dilger static int 1913e50e5129SAndreas Dilger ext4_expand_ino_array(struct ext4_xattr_ino_array **lea_ino_array, __u32 ino) 1914e50e5129SAndreas Dilger { 1915e50e5129SAndreas Dilger if (*lea_ino_array == NULL) { 1916e50e5129SAndreas Dilger /* 1917e50e5129SAndreas Dilger * Start with 15 inodes, so it fits into a power-of-two size. 1918e50e5129SAndreas Dilger * If *lea_ino_array is NULL, this is essentially offsetof() 1919e50e5129SAndreas Dilger */ 1920e50e5129SAndreas Dilger (*lea_ino_array) = 1921e50e5129SAndreas Dilger kmalloc(offsetof(struct ext4_xattr_ino_array, 1922e50e5129SAndreas Dilger xia_inodes[EIA_MASK]), 1923e50e5129SAndreas Dilger GFP_NOFS); 1924e50e5129SAndreas Dilger if (*lea_ino_array == NULL) 1925e50e5129SAndreas Dilger return -ENOMEM; 1926e50e5129SAndreas Dilger (*lea_ino_array)->xia_count = 0; 1927e50e5129SAndreas Dilger } else if (((*lea_ino_array)->xia_count & EIA_MASK) == EIA_MASK) { 1928e50e5129SAndreas Dilger /* expand the array once all 15 + n * 16 slots are full */ 1929e50e5129SAndreas Dilger struct ext4_xattr_ino_array *new_array = NULL; 1930e50e5129SAndreas Dilger int count = (*lea_ino_array)->xia_count; 1931e50e5129SAndreas Dilger 1932e50e5129SAndreas Dilger /* if new_array is NULL, this is essentially offsetof() */ 1933e50e5129SAndreas Dilger new_array = kmalloc( 1934e50e5129SAndreas Dilger offsetof(struct ext4_xattr_ino_array, 1935e50e5129SAndreas Dilger xia_inodes[count + EIA_INCR]), 1936e50e5129SAndreas Dilger GFP_NOFS); 1937e50e5129SAndreas Dilger if (new_array == NULL) 1938e50e5129SAndreas Dilger return -ENOMEM; 1939e50e5129SAndreas Dilger memcpy(new_array, *lea_ino_array, 1940e50e5129SAndreas Dilger offsetof(struct ext4_xattr_ino_array, 1941e50e5129SAndreas Dilger xia_inodes[count])); 1942e50e5129SAndreas Dilger kfree(*lea_ino_array); 1943e50e5129SAndreas Dilger *lea_ino_array = new_array; 1944e50e5129SAndreas Dilger } 1945e50e5129SAndreas Dilger (*lea_ino_array)->xia_inodes[(*lea_ino_array)->xia_count++] = ino; 1946e50e5129SAndreas Dilger return 0; 1947e50e5129SAndreas Dilger } 1948e50e5129SAndreas Dilger 1949e50e5129SAndreas Dilger /** 1950e50e5129SAndreas Dilger * Add xattr inode to orphan list 1951e50e5129SAndreas Dilger */ 1952e50e5129SAndreas Dilger static int 1953e50e5129SAndreas Dilger ext4_xattr_inode_orphan_add(handle_t *handle, struct inode *inode, 1954e50e5129SAndreas Dilger int credits, struct ext4_xattr_ino_array *lea_ino_array) 1955e50e5129SAndreas Dilger { 1956*bab79b04STahsin Erdogan struct inode *ea_inode; 1957e50e5129SAndreas Dilger int idx = 0, error = 0; 1958e50e5129SAndreas Dilger 1959e50e5129SAndreas Dilger if (lea_ino_array == NULL) 1960e50e5129SAndreas Dilger return 0; 1961e50e5129SAndreas Dilger 1962e50e5129SAndreas Dilger for (; idx < lea_ino_array->xia_count; ++idx) { 1963e50e5129SAndreas Dilger if (!ext4_handle_has_enough_credits(handle, credits)) { 1964e50e5129SAndreas Dilger error = ext4_journal_extend(handle, credits); 1965e50e5129SAndreas Dilger if (error > 0) 1966e50e5129SAndreas Dilger error = ext4_journal_restart(handle, credits); 1967e50e5129SAndreas Dilger 1968e50e5129SAndreas Dilger if (error != 0) { 1969e50e5129SAndreas Dilger ext4_warning(inode->i_sb, 1970e50e5129SAndreas Dilger "couldn't extend journal " 1971e50e5129SAndreas Dilger "(err %d)", error); 1972e50e5129SAndreas Dilger return error; 1973e50e5129SAndreas Dilger } 1974e50e5129SAndreas Dilger } 1975*bab79b04STahsin Erdogan error = ext4_xattr_inode_iget(inode, 1976*bab79b04STahsin Erdogan lea_ino_array->xia_inodes[idx], &ea_inode); 1977e50e5129SAndreas Dilger if (error) 1978e50e5129SAndreas Dilger continue; 19790de5983dSTahsin Erdogan inode_lock(ea_inode); 1980e50e5129SAndreas Dilger ext4_orphan_add(handle, ea_inode); 19810de5983dSTahsin Erdogan inode_unlock(ea_inode); 1982e50e5129SAndreas Dilger /* the inode's i_count will be released by caller */ 1983e50e5129SAndreas Dilger } 1984e50e5129SAndreas Dilger 1985e50e5129SAndreas Dilger return 0; 1986e50e5129SAndreas Dilger } 19876dd4ee7cSKalpak Shah 19886dd4ee7cSKalpak Shah /* 1989617ba13bSMingming Cao * ext4_xattr_delete_inode() 1990ac27a0ecSDave Kleikamp * 1991e50e5129SAndreas Dilger * Free extended attribute resources associated with this inode. Traverse 1992e50e5129SAndreas Dilger * all entries and unlink any xattr inodes associated with this inode. This 1993ac27a0ecSDave Kleikamp * is called immediately before an inode is freed. We have exclusive 1994e50e5129SAndreas Dilger * access to the inode. If an orphan inode is deleted it will also delete any 1995e50e5129SAndreas Dilger * xattr block and all xattr inodes. They are checked by ext4_xattr_inode_iget() 1996e50e5129SAndreas Dilger * to ensure they belong to the parent inode and were not deleted already. 1997ac27a0ecSDave Kleikamp */ 1998e50e5129SAndreas Dilger int 1999e50e5129SAndreas Dilger ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, 2000e50e5129SAndreas Dilger struct ext4_xattr_ino_array **lea_ino_array) 2001ac27a0ecSDave Kleikamp { 2002ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 2003e50e5129SAndreas Dilger struct ext4_xattr_ibody_header *header; 2004e50e5129SAndreas Dilger struct ext4_inode *raw_inode; 2005e50e5129SAndreas Dilger struct ext4_iloc iloc; 2006e50e5129SAndreas Dilger struct ext4_xattr_entry *entry; 2007e50e5129SAndreas Dilger int credits = 3, error = 0; 2008ac27a0ecSDave Kleikamp 2009e50e5129SAndreas Dilger if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 2010e50e5129SAndreas Dilger goto delete_external_ea; 2011e50e5129SAndreas Dilger 2012e50e5129SAndreas Dilger error = ext4_get_inode_loc(inode, &iloc); 2013e50e5129SAndreas Dilger if (error) 2014ac27a0ecSDave Kleikamp goto cleanup; 2015e50e5129SAndreas Dilger raw_inode = ext4_raw_inode(&iloc); 2016e50e5129SAndreas Dilger header = IHDR(inode, raw_inode); 2017e50e5129SAndreas Dilger for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); 2018e50e5129SAndreas Dilger entry = EXT4_XATTR_NEXT(entry)) { 2019e50e5129SAndreas Dilger if (!entry->e_value_inum) 2020e50e5129SAndreas Dilger continue; 2021e50e5129SAndreas Dilger if (ext4_expand_ino_array(lea_ino_array, 2022e50e5129SAndreas Dilger entry->e_value_inum) != 0) { 2023e50e5129SAndreas Dilger brelse(iloc.bh); 2024e50e5129SAndreas Dilger goto cleanup; 2025e50e5129SAndreas Dilger } 2026e50e5129SAndreas Dilger entry->e_value_inum = 0; 2027e50e5129SAndreas Dilger } 2028e50e5129SAndreas Dilger brelse(iloc.bh); 2029e50e5129SAndreas Dilger 2030e50e5129SAndreas Dilger delete_external_ea: 2031e50e5129SAndreas Dilger if (!EXT4_I(inode)->i_file_acl) { 2032e50e5129SAndreas Dilger /* add xattr inode to orphan list */ 2033e50e5129SAndreas Dilger ext4_xattr_inode_orphan_add(handle, inode, credits, 2034e50e5129SAndreas Dilger *lea_ino_array); 2035e50e5129SAndreas Dilger goto cleanup; 2036e50e5129SAndreas Dilger } 2037617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 2038ac27a0ecSDave Kleikamp if (!bh) { 203924676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 204024676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2041ac27a0ecSDave Kleikamp goto cleanup; 2042ac27a0ecSDave Kleikamp } 2043617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 2044ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) { 204524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 204624676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2047ac27a0ecSDave Kleikamp goto cleanup; 2048ac27a0ecSDave Kleikamp } 2049e50e5129SAndreas Dilger 2050e50e5129SAndreas Dilger for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 2051e50e5129SAndreas Dilger entry = EXT4_XATTR_NEXT(entry)) { 2052e50e5129SAndreas Dilger if (!entry->e_value_inum) 2053e50e5129SAndreas Dilger continue; 2054e50e5129SAndreas Dilger if (ext4_expand_ino_array(lea_ino_array, 2055e50e5129SAndreas Dilger entry->e_value_inum) != 0) 2056e50e5129SAndreas Dilger goto cleanup; 2057e50e5129SAndreas Dilger entry->e_value_inum = 0; 2058e50e5129SAndreas Dilger } 2059e50e5129SAndreas Dilger 2060e50e5129SAndreas Dilger /* add xattr inode to orphan list */ 2061e50e5129SAndreas Dilger error = ext4_xattr_inode_orphan_add(handle, inode, credits, 2062e50e5129SAndreas Dilger *lea_ino_array); 2063e50e5129SAndreas Dilger if (error != 0) 2064e50e5129SAndreas Dilger goto cleanup; 2065e50e5129SAndreas Dilger 2066e50e5129SAndreas Dilger if (!IS_NOQUOTA(inode)) 2067e50e5129SAndreas Dilger credits += 2 * EXT4_QUOTA_DEL_BLOCKS(inode->i_sb); 2068e50e5129SAndreas Dilger 2069e50e5129SAndreas Dilger if (!ext4_handle_has_enough_credits(handle, credits)) { 2070e50e5129SAndreas Dilger error = ext4_journal_extend(handle, credits); 2071e50e5129SAndreas Dilger if (error > 0) 2072e50e5129SAndreas Dilger error = ext4_journal_restart(handle, credits); 2073e50e5129SAndreas Dilger if (error != 0) { 2074e50e5129SAndreas Dilger ext4_warning(inode->i_sb, 2075e50e5129SAndreas Dilger "couldn't extend journal (err %d)", error); 2076e50e5129SAndreas Dilger goto cleanup; 2077e50e5129SAndreas Dilger } 2078e50e5129SAndreas Dilger } 2079e50e5129SAndreas Dilger 2080617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bh); 2081617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 2082ac27a0ecSDave Kleikamp 2083ac27a0ecSDave Kleikamp cleanup: 2084ac27a0ecSDave Kleikamp brelse(bh); 2085e50e5129SAndreas Dilger 2086e50e5129SAndreas Dilger return error; 2087e50e5129SAndreas Dilger } 2088e50e5129SAndreas Dilger 2089e50e5129SAndreas Dilger void 2090e50e5129SAndreas Dilger ext4_xattr_inode_array_free(struct inode *inode, 2091e50e5129SAndreas Dilger struct ext4_xattr_ino_array *lea_ino_array) 2092e50e5129SAndreas Dilger { 2093*bab79b04STahsin Erdogan struct inode *ea_inode; 2094e50e5129SAndreas Dilger int idx = 0; 2095e50e5129SAndreas Dilger int err; 2096e50e5129SAndreas Dilger 2097e50e5129SAndreas Dilger if (lea_ino_array == NULL) 2098e50e5129SAndreas Dilger return; 2099e50e5129SAndreas Dilger 2100e50e5129SAndreas Dilger for (; idx < lea_ino_array->xia_count; ++idx) { 2101*bab79b04STahsin Erdogan err = ext4_xattr_inode_iget(inode, 2102*bab79b04STahsin Erdogan lea_ino_array->xia_inodes[idx], &ea_inode); 2103e50e5129SAndreas Dilger if (err) 2104e50e5129SAndreas Dilger continue; 2105e50e5129SAndreas Dilger /* for inode's i_count get from ext4_xattr_delete_inode */ 2106e50e5129SAndreas Dilger iput(ea_inode); 2107e50e5129SAndreas Dilger clear_nlink(ea_inode); 2108e50e5129SAndreas Dilger iput(ea_inode); 2109e50e5129SAndreas Dilger } 2110e50e5129SAndreas Dilger kfree(lea_ino_array); 2111ac27a0ecSDave Kleikamp } 2112ac27a0ecSDave Kleikamp 2113ac27a0ecSDave Kleikamp /* 2114617ba13bSMingming Cao * ext4_xattr_cache_insert() 2115ac27a0ecSDave Kleikamp * 2116ac27a0ecSDave Kleikamp * Create a new entry in the extended attribute cache, and insert 2117ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 2118ac27a0ecSDave Kleikamp * 2119ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2120ac27a0ecSDave Kleikamp */ 2121ac27a0ecSDave Kleikamp static void 21227a2508e1SJan Kara ext4_xattr_cache_insert(struct mb_cache *ext4_mb_cache, struct buffer_head *bh) 2123ac27a0ecSDave Kleikamp { 21246048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 21256048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 21266048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 21276048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 2128ac27a0ecSDave Kleikamp int error; 2129ac27a0ecSDave Kleikamp 21307a2508e1SJan Kara error = mb_cache_entry_create(ext4_mb_cache, GFP_NOFS, hash, 21316048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 2132ac27a0ecSDave Kleikamp if (error) { 213382939d79SJan Kara if (error == -EBUSY) 2134ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 213582939d79SJan Kara } else 2136ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 2137ac27a0ecSDave Kleikamp } 2138ac27a0ecSDave Kleikamp 2139ac27a0ecSDave Kleikamp /* 2140617ba13bSMingming Cao * ext4_xattr_cmp() 2141ac27a0ecSDave Kleikamp * 2142ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 2143ac27a0ecSDave Kleikamp * 2144ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 2145ac27a0ecSDave Kleikamp * a negative error number on errors. 2146ac27a0ecSDave Kleikamp */ 2147ac27a0ecSDave Kleikamp static int 2148617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 2149617ba13bSMingming Cao struct ext4_xattr_header *header2) 2150ac27a0ecSDave Kleikamp { 2151617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 2152ac27a0ecSDave Kleikamp 2153ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 2154ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 2155ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 2156ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 2157ac27a0ecSDave Kleikamp return 1; 2158ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 2159ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 2160ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 2161ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 2162e50e5129SAndreas Dilger entry1->e_value_inum != entry2->e_value_inum || 2163ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 2164ac27a0ecSDave Kleikamp return 1; 2165ac27a0ecSDave Kleikamp if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 2166ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 2167ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 2168ac27a0ecSDave Kleikamp return 1; 2169ac27a0ecSDave Kleikamp 2170617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 2171617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 2172ac27a0ecSDave Kleikamp } 2173ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 2174ac27a0ecSDave Kleikamp return 1; 2175ac27a0ecSDave Kleikamp return 0; 2176ac27a0ecSDave Kleikamp } 2177ac27a0ecSDave Kleikamp 2178ac27a0ecSDave Kleikamp /* 2179617ba13bSMingming Cao * ext4_xattr_cache_find() 2180ac27a0ecSDave Kleikamp * 2181ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 2182ac27a0ecSDave Kleikamp * 2183ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 2184ac27a0ecSDave Kleikamp * not found or an error occurred. 2185ac27a0ecSDave Kleikamp */ 2186ac27a0ecSDave Kleikamp static struct buffer_head * 2187617ba13bSMingming Cao ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, 21887a2508e1SJan Kara struct mb_cache_entry **pce) 2189ac27a0ecSDave Kleikamp { 2190ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 21917a2508e1SJan Kara struct mb_cache_entry *ce; 21927a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 2193ac27a0ecSDave Kleikamp 2194ac27a0ecSDave Kleikamp if (!header->h_hash) 2195ac27a0ecSDave Kleikamp return NULL; /* never share */ 2196ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 21977a2508e1SJan Kara ce = mb_cache_entry_find_first(ext4_mb_cache, hash); 2198ac27a0ecSDave Kleikamp while (ce) { 2199ac27a0ecSDave Kleikamp struct buffer_head *bh; 2200ac27a0ecSDave Kleikamp 2201ac27a0ecSDave Kleikamp bh = sb_bread(inode->i_sb, ce->e_block); 2202ac27a0ecSDave Kleikamp if (!bh) { 220324676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 220424676da4STheodore Ts'o (unsigned long) ce->e_block); 2205617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 2206ac27a0ecSDave Kleikamp *pce = ce; 2207ac27a0ecSDave Kleikamp return bh; 2208ac27a0ecSDave Kleikamp } 2209ac27a0ecSDave Kleikamp brelse(bh); 22107a2508e1SJan Kara ce = mb_cache_entry_find_next(ext4_mb_cache, ce); 2211ac27a0ecSDave Kleikamp } 2212ac27a0ecSDave Kleikamp return NULL; 2213ac27a0ecSDave Kleikamp } 2214ac27a0ecSDave Kleikamp 2215ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 2216ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 2217ac27a0ecSDave Kleikamp 2218ac27a0ecSDave Kleikamp /* 2219617ba13bSMingming Cao * ext4_xattr_hash_entry() 2220ac27a0ecSDave Kleikamp * 2221ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 2222ac27a0ecSDave Kleikamp */ 2223617ba13bSMingming Cao static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, 2224617ba13bSMingming Cao struct ext4_xattr_entry *entry) 2225ac27a0ecSDave Kleikamp { 2226ac27a0ecSDave Kleikamp __u32 hash = 0; 2227ac27a0ecSDave Kleikamp char *name = entry->e_name; 2228ac27a0ecSDave Kleikamp int n; 2229ac27a0ecSDave Kleikamp 2230ac27a0ecSDave Kleikamp for (n = 0; n < entry->e_name_len; n++) { 2231ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 2232ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 2233ac27a0ecSDave Kleikamp *name++; 2234ac27a0ecSDave Kleikamp } 2235ac27a0ecSDave Kleikamp 2236e50e5129SAndreas Dilger if (!entry->e_value_inum && entry->e_value_size) { 2237ac27a0ecSDave Kleikamp __le32 *value = (__le32 *)((char *)header + 2238ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs)); 2239ac27a0ecSDave Kleikamp for (n = (le32_to_cpu(entry->e_value_size) + 2240617ba13bSMingming Cao EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { 2241ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 2242ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 2243ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 2244ac27a0ecSDave Kleikamp } 2245ac27a0ecSDave Kleikamp } 2246ac27a0ecSDave Kleikamp entry->e_hash = cpu_to_le32(hash); 2247ac27a0ecSDave Kleikamp } 2248ac27a0ecSDave Kleikamp 2249ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 2250ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 2251ac27a0ecSDave Kleikamp 2252ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 2253ac27a0ecSDave Kleikamp 2254ac27a0ecSDave Kleikamp /* 2255617ba13bSMingming Cao * ext4_xattr_rehash() 2256ac27a0ecSDave Kleikamp * 2257ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 2258ac27a0ecSDave Kleikamp */ 2259617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *header, 2260617ba13bSMingming Cao struct ext4_xattr_entry *entry) 2261ac27a0ecSDave Kleikamp { 2262617ba13bSMingming Cao struct ext4_xattr_entry *here; 2263ac27a0ecSDave Kleikamp __u32 hash = 0; 2264ac27a0ecSDave Kleikamp 2265617ba13bSMingming Cao ext4_xattr_hash_entry(header, entry); 2266ac27a0ecSDave Kleikamp here = ENTRY(header+1); 2267ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 2268ac27a0ecSDave Kleikamp if (!here->e_hash) { 2269ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 2270ac27a0ecSDave Kleikamp hash = 0; 2271ac27a0ecSDave Kleikamp break; 2272ac27a0ecSDave Kleikamp } 2273ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 2274ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 2275ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 2276617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 2277ac27a0ecSDave Kleikamp } 2278ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 2279ac27a0ecSDave Kleikamp } 2280ac27a0ecSDave Kleikamp 2281ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 2282ac27a0ecSDave Kleikamp 22839c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 22849c191f70ST Makphaibulchoke 22857a2508e1SJan Kara struct mb_cache * 228682939d79SJan Kara ext4_xattr_create_cache(void) 2287ac27a0ecSDave Kleikamp { 22887a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 2289ac27a0ecSDave Kleikamp } 2290ac27a0ecSDave Kleikamp 22917a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 2292ac27a0ecSDave Kleikamp { 22939c191f70ST Makphaibulchoke if (cache) 22947a2508e1SJan Kara mb_cache_destroy(cache); 2295ac27a0ecSDave Kleikamp } 22969c191f70ST Makphaibulchoke 2297