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 75*47387409STahsin Erdogan static void ext4_xattr_block_cache_insert(struct mb_cache *, 76*47387409STahsin Erdogan struct buffer_head *); 77*47387409STahsin Erdogan static struct buffer_head * 78*47387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *, struct ext4_xattr_header *, 797a2508e1SJan Kara struct mb_cache_entry **); 80617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *, 81617ba13bSMingming Cao struct ext4_xattr_entry *); 82ac27a0ecSDave Kleikamp 83d6006186SEric Biggers static const struct xattr_handler * const ext4_xattr_handler_map[] = { 84617ba13bSMingming Cao [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, 8503010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 8664e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, 8764e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, 88ac27a0ecSDave Kleikamp #endif 89617ba13bSMingming Cao [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, 9003010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 91617ba13bSMingming Cao [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, 92ac27a0ecSDave Kleikamp #endif 93ac27a0ecSDave Kleikamp }; 94ac27a0ecSDave Kleikamp 9511e27528SStephen Hemminger const struct xattr_handler *ext4_xattr_handlers[] = { 96617ba13bSMingming Cao &ext4_xattr_user_handler, 97617ba13bSMingming Cao &ext4_xattr_trusted_handler, 9803010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 9964e178a7SChristoph Hellwig &posix_acl_access_xattr_handler, 10064e178a7SChristoph Hellwig &posix_acl_default_xattr_handler, 101ac27a0ecSDave Kleikamp #endif 10203010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 103617ba13bSMingming Cao &ext4_xattr_security_handler, 104ac27a0ecSDave Kleikamp #endif 105ac27a0ecSDave Kleikamp NULL 106ac27a0ecSDave Kleikamp }; 107ac27a0ecSDave Kleikamp 108*47387409STahsin Erdogan #define EA_BLOCK_CACHE(inode) (((struct ext4_sb_info *) \ 109*47387409STahsin Erdogan inode->i_sb->s_fs_info)->s_ea_block_cache) 1109c191f70ST Makphaibulchoke 11133d201e0STahsin Erdogan #ifdef CONFIG_LOCKDEP 11233d201e0STahsin Erdogan void ext4_xattr_inode_set_class(struct inode *ea_inode) 11333d201e0STahsin Erdogan { 11433d201e0STahsin Erdogan lockdep_set_subclass(&ea_inode->i_rwsem, 1); 11533d201e0STahsin Erdogan } 11633d201e0STahsin Erdogan #endif 11733d201e0STahsin Erdogan 118cc8e94fdSDarrick J. Wong static __le32 ext4_xattr_block_csum(struct inode *inode, 119cc8e94fdSDarrick J. Wong sector_t block_nr, 120cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 121cc8e94fdSDarrick J. Wong { 122cc8e94fdSDarrick J. Wong struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 123d6a77105STheodore Ts'o __u32 csum; 124d6a77105STheodore Ts'o __le64 dsk_block_nr = cpu_to_le64(block_nr); 125b47820edSDaeho Jeong __u32 dummy_csum = 0; 126b47820edSDaeho Jeong int offset = offsetof(struct ext4_xattr_header, h_checksum); 127cc8e94fdSDarrick J. Wong 128d6a77105STheodore Ts'o csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, 129d6a77105STheodore Ts'o sizeof(dsk_block_nr)); 130b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); 131b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); 132b47820edSDaeho Jeong offset += sizeof(dummy_csum); 133b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, 134b47820edSDaeho Jeong EXT4_BLOCK_SIZE(inode->i_sb) - offset); 13541eb70ddSTao Ma 136cc8e94fdSDarrick J. Wong return cpu_to_le32(csum); 137cc8e94fdSDarrick J. Wong } 138cc8e94fdSDarrick J. Wong 139cc8e94fdSDarrick J. Wong static int ext4_xattr_block_csum_verify(struct inode *inode, 140dac7a4b4STheodore Ts'o struct buffer_head *bh) 141cc8e94fdSDarrick J. Wong { 142dac7a4b4STheodore Ts'o struct ext4_xattr_header *hdr = BHDR(bh); 143dac7a4b4STheodore Ts'o int ret = 1; 144dac7a4b4STheodore Ts'o 145dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) { 146dac7a4b4STheodore Ts'o lock_buffer(bh); 147dac7a4b4STheodore Ts'o ret = (hdr->h_checksum == ext4_xattr_block_csum(inode, 148dac7a4b4STheodore Ts'o bh->b_blocknr, hdr)); 149dac7a4b4STheodore Ts'o unlock_buffer(bh); 150dac7a4b4STheodore Ts'o } 151dac7a4b4STheodore Ts'o return ret; 152cc8e94fdSDarrick J. Wong } 153cc8e94fdSDarrick J. Wong 154cc8e94fdSDarrick J. Wong static void ext4_xattr_block_csum_set(struct inode *inode, 155cc8e94fdSDarrick J. Wong struct buffer_head *bh) 156cc8e94fdSDarrick J. Wong { 157dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) 158dac7a4b4STheodore Ts'o BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode, 159dac7a4b4STheodore Ts'o bh->b_blocknr, BHDR(bh)); 160cc8e94fdSDarrick J. Wong } 161cc8e94fdSDarrick J. Wong 16211e27528SStephen Hemminger static inline const struct xattr_handler * 163617ba13bSMingming Cao ext4_xattr_handler(int name_index) 164ac27a0ecSDave Kleikamp { 16511e27528SStephen Hemminger const struct xattr_handler *handler = NULL; 166ac27a0ecSDave Kleikamp 167617ba13bSMingming Cao if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) 168617ba13bSMingming Cao handler = ext4_xattr_handler_map[name_index]; 169ac27a0ecSDave Kleikamp return handler; 170ac27a0ecSDave Kleikamp } 171ac27a0ecSDave Kleikamp 172ac27a0ecSDave Kleikamp static int 1732c4f9923SEric Biggers ext4_xattr_check_entries(struct ext4_xattr_entry *entry, void *end, 174a0626e75SDarrick J. Wong void *value_start) 175ac27a0ecSDave Kleikamp { 176a0626e75SDarrick J. Wong struct ext4_xattr_entry *e = entry; 177a0626e75SDarrick J. Wong 178d7614cc1SEric Biggers /* Find the end of the names list */ 179a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(e)) { 180a0626e75SDarrick J. Wong struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); 181ac27a0ecSDave Kleikamp if ((void *)next >= end) 1826a797d27SDarrick J. Wong return -EFSCORRUPTED; 183a0626e75SDarrick J. Wong e = next; 184ac27a0ecSDave Kleikamp } 185a0626e75SDarrick J. Wong 186d7614cc1SEric Biggers /* Check the values */ 187a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(entry)) { 188e50e5129SAndreas Dilger if (entry->e_value_size != 0 && 189e50e5129SAndreas Dilger entry->e_value_inum == 0) { 190d7614cc1SEric Biggers u16 offs = le16_to_cpu(entry->e_value_offs); 191d7614cc1SEric Biggers u32 size = le32_to_cpu(entry->e_value_size); 192d7614cc1SEric Biggers void *value; 193d7614cc1SEric Biggers 194d7614cc1SEric Biggers /* 195d7614cc1SEric Biggers * The value cannot overlap the names, and the value 196d7614cc1SEric Biggers * with padding cannot extend beyond 'end'. Check both 197d7614cc1SEric Biggers * the padded and unpadded sizes, since the size may 198d7614cc1SEric Biggers * overflow to 0 when adding padding. 199d7614cc1SEric Biggers */ 200d7614cc1SEric Biggers if (offs > end - value_start) 2016a797d27SDarrick J. Wong return -EFSCORRUPTED; 202d7614cc1SEric Biggers value = value_start + offs; 203d7614cc1SEric Biggers if (value < (void *)e + sizeof(u32) || 204d7614cc1SEric Biggers size > end - value || 205d7614cc1SEric Biggers EXT4_XATTR_SIZE(size) > end - value) 206d7614cc1SEric Biggers return -EFSCORRUPTED; 207d7614cc1SEric Biggers } 208a0626e75SDarrick J. Wong entry = EXT4_XATTR_NEXT(entry); 209a0626e75SDarrick J. Wong } 210a0626e75SDarrick J. Wong 211ac27a0ecSDave Kleikamp return 0; 212ac27a0ecSDave Kleikamp } 213ac27a0ecSDave Kleikamp 214ac27a0ecSDave Kleikamp static inline int 215cc8e94fdSDarrick J. Wong ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) 216ac27a0ecSDave Kleikamp { 217cc8e94fdSDarrick J. Wong int error; 218cc8e94fdSDarrick J. Wong 219cc8e94fdSDarrick J. Wong if (buffer_verified(bh)) 220cc8e94fdSDarrick J. Wong return 0; 221cc8e94fdSDarrick J. Wong 222617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 223ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) 2246a797d27SDarrick J. Wong return -EFSCORRUPTED; 225dac7a4b4STheodore Ts'o if (!ext4_xattr_block_csum_verify(inode, bh)) 2266a797d27SDarrick J. Wong return -EFSBADCRC; 2272c4f9923SEric Biggers error = ext4_xattr_check_entries(BFIRST(bh), bh->b_data + bh->b_size, 228a0626e75SDarrick J. Wong bh->b_data); 229cc8e94fdSDarrick J. Wong if (!error) 230cc8e94fdSDarrick J. Wong set_buffer_verified(bh); 231cc8e94fdSDarrick J. Wong return error; 232ac27a0ecSDave Kleikamp } 233ac27a0ecSDave Kleikamp 2349e92f48cSTheodore Ts'o static int 2359e92f48cSTheodore Ts'o __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, 2369e92f48cSTheodore Ts'o void *end, const char *function, unsigned int line) 2379e92f48cSTheodore Ts'o { 2389e92f48cSTheodore Ts'o int error = -EFSCORRUPTED; 2399e92f48cSTheodore Ts'o 240290ab230SEric Biggers if (end - (void *)header < sizeof(*header) + sizeof(u32) || 24119962509SEric Biggers (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) 2429e92f48cSTheodore Ts'o goto errout; 2432c4f9923SEric Biggers error = ext4_xattr_check_entries(IFIRST(header), end, IFIRST(header)); 2449e92f48cSTheodore Ts'o errout: 2459e92f48cSTheodore Ts'o if (error) 2469e92f48cSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, 2479e92f48cSTheodore Ts'o "corrupted in-inode xattr"); 2489e92f48cSTheodore Ts'o return error; 2499e92f48cSTheodore Ts'o } 2509e92f48cSTheodore Ts'o 2519e92f48cSTheodore Ts'o #define xattr_check_inode(inode, header, end) \ 2529e92f48cSTheodore Ts'o __xattr_check_inode((inode), (header), (end), __func__, __LINE__) 2539e92f48cSTheodore Ts'o 254ac27a0ecSDave Kleikamp static int 255617ba13bSMingming Cao ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, 2566ba644b9SEric Biggers const char *name, int sorted) 257ac27a0ecSDave Kleikamp { 258617ba13bSMingming Cao struct ext4_xattr_entry *entry; 259ac27a0ecSDave Kleikamp size_t name_len; 260ac27a0ecSDave Kleikamp int cmp = 1; 261ac27a0ecSDave Kleikamp 262ac27a0ecSDave Kleikamp if (name == NULL) 263ac27a0ecSDave Kleikamp return -EINVAL; 264ac27a0ecSDave Kleikamp name_len = strlen(name); 265ac27a0ecSDave Kleikamp entry = *pentry; 266617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 267ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 268ac27a0ecSDave Kleikamp if (!cmp) 269ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 270ac27a0ecSDave Kleikamp if (!cmp) 271ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 272ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 273ac27a0ecSDave Kleikamp break; 274ac27a0ecSDave Kleikamp } 275ac27a0ecSDave Kleikamp *pentry = entry; 276ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 277ac27a0ecSDave Kleikamp } 278ac27a0ecSDave Kleikamp 279e50e5129SAndreas Dilger /* 280e50e5129SAndreas Dilger * Read the EA value from an inode. 281e50e5129SAndreas Dilger */ 28290966693STahsin Erdogan static int 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; 28690966693STahsin Erdogan int blocksize = ea_inode->i_sb->s_blocksize; 28790966693STahsin Erdogan size_t csize, copied = 0; 288e50e5129SAndreas Dilger 28990966693STahsin Erdogan while (copied < size) { 29090966693STahsin Erdogan csize = (size - copied) > blocksize ? blocksize : size - copied; 291e50e5129SAndreas Dilger bh = ext4_bread(NULL, ea_inode, block, 0); 29290966693STahsin Erdogan if (IS_ERR(bh)) 293e50e5129SAndreas Dilger return PTR_ERR(bh); 29490966693STahsin Erdogan if (!bh) 29590966693STahsin Erdogan return -EFSCORRUPTED; 29690966693STahsin Erdogan 297e50e5129SAndreas Dilger memcpy(buf, bh->b_data, csize); 298e50e5129SAndreas Dilger brelse(bh); 299e50e5129SAndreas Dilger 300e50e5129SAndreas Dilger buf += csize; 301e50e5129SAndreas Dilger block += 1; 30290966693STahsin Erdogan copied += csize; 303e50e5129SAndreas Dilger } 304e50e5129SAndreas Dilger return 0; 305e50e5129SAndreas Dilger } 306e50e5129SAndreas Dilger 307bab79b04STahsin Erdogan static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, 308bab79b04STahsin Erdogan struct inode **ea_inode) 309e50e5129SAndreas Dilger { 310bab79b04STahsin Erdogan struct inode *inode; 311bab79b04STahsin Erdogan int err; 312e50e5129SAndreas Dilger 313bab79b04STahsin Erdogan inode = ext4_iget(parent->i_sb, ea_ino); 314bab79b04STahsin Erdogan if (IS_ERR(inode)) { 315bab79b04STahsin Erdogan err = PTR_ERR(inode); 316e50e5129SAndreas Dilger ext4_error(parent->i_sb, "error while reading EA inode %lu " 317bab79b04STahsin Erdogan "err=%d", ea_ino, err); 318bab79b04STahsin Erdogan return err; 319e50e5129SAndreas Dilger } 320e50e5129SAndreas Dilger 321bab79b04STahsin Erdogan if (is_bad_inode(inode)) { 322bab79b04STahsin Erdogan ext4_error(parent->i_sb, "error while reading EA inode %lu " 323bab79b04STahsin Erdogan "is_bad_inode", ea_ino); 324bab79b04STahsin Erdogan err = -EIO; 325e50e5129SAndreas Dilger goto error; 326e50e5129SAndreas Dilger } 327e50e5129SAndreas Dilger 328bab79b04STahsin Erdogan if (EXT4_XATTR_INODE_GET_PARENT(inode) != parent->i_ino || 329bab79b04STahsin Erdogan inode->i_generation != parent->i_generation) { 330bab79b04STahsin Erdogan ext4_error(parent->i_sb, "Backpointer from EA inode %lu " 331bab79b04STahsin Erdogan "to parent is invalid.", ea_ino); 332bab79b04STahsin Erdogan err = -EINVAL; 333bab79b04STahsin Erdogan goto error; 334bab79b04STahsin Erdogan } 335bab79b04STahsin Erdogan 336bab79b04STahsin Erdogan if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) { 337e50e5129SAndreas Dilger ext4_error(parent->i_sb, "EA inode %lu does not have " 338e50e5129SAndreas Dilger "EXT4_EA_INODE_FL flag set.\n", ea_ino); 339bab79b04STahsin Erdogan err = -EINVAL; 340e50e5129SAndreas Dilger goto error; 341e50e5129SAndreas Dilger } 342e50e5129SAndreas Dilger 343bab79b04STahsin Erdogan *ea_inode = inode; 344bab79b04STahsin Erdogan return 0; 345e50e5129SAndreas Dilger error: 346bab79b04STahsin Erdogan iput(inode); 347bab79b04STahsin Erdogan return err; 348e50e5129SAndreas Dilger } 349e50e5129SAndreas Dilger 350e50e5129SAndreas Dilger /* 351e50e5129SAndreas Dilger * Read the value from the EA inode. 352e50e5129SAndreas Dilger */ 353e50e5129SAndreas Dilger static int 354e50e5129SAndreas Dilger ext4_xattr_inode_get(struct inode *inode, unsigned long ea_ino, void *buffer, 35590966693STahsin Erdogan size_t size) 356e50e5129SAndreas Dilger { 357bab79b04STahsin Erdogan struct inode *ea_inode; 358bab79b04STahsin Erdogan int ret; 359e50e5129SAndreas Dilger 360bab79b04STahsin Erdogan ret = ext4_xattr_inode_iget(inode, ea_ino, &ea_inode); 361bab79b04STahsin Erdogan if (ret) 362bab79b04STahsin Erdogan return ret; 363e50e5129SAndreas Dilger 364bab79b04STahsin Erdogan ret = ext4_xattr_inode_read(ea_inode, buffer, size); 365e50e5129SAndreas Dilger iput(ea_inode); 366e50e5129SAndreas Dilger 367bab79b04STahsin Erdogan return ret; 368e50e5129SAndreas Dilger } 369e50e5129SAndreas Dilger 370ac27a0ecSDave Kleikamp static int 371617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 372ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 373ac27a0ecSDave Kleikamp { 374ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 375617ba13bSMingming Cao struct ext4_xattr_entry *entry; 376ac27a0ecSDave Kleikamp size_t size; 377ac27a0ecSDave Kleikamp int error; 378*47387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 379ac27a0ecSDave Kleikamp 380ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 381ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 382ac27a0ecSDave Kleikamp 383ac27a0ecSDave Kleikamp error = -ENODATA; 384617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 385ac27a0ecSDave Kleikamp goto cleanup; 386ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 387ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 388617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 389ac27a0ecSDave Kleikamp if (!bh) 390ac27a0ecSDave Kleikamp goto cleanup; 391ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 392ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 393cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 39424676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 395617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 3966a797d27SDarrick J. Wong error = -EFSCORRUPTED; 397ac27a0ecSDave Kleikamp goto cleanup; 398ac27a0ecSDave Kleikamp } 399*47387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bh); 400ac27a0ecSDave Kleikamp entry = BFIRST(bh); 4016ba644b9SEric Biggers error = ext4_xattr_find_entry(&entry, name_index, name, 1); 402ac27a0ecSDave Kleikamp if (error) 403ac27a0ecSDave Kleikamp goto cleanup; 404ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 405ac27a0ecSDave Kleikamp if (buffer) { 406ac27a0ecSDave Kleikamp error = -ERANGE; 407ac27a0ecSDave Kleikamp if (size > buffer_size) 408ac27a0ecSDave Kleikamp goto cleanup; 409e50e5129SAndreas Dilger if (entry->e_value_inum) { 410e50e5129SAndreas Dilger error = ext4_xattr_inode_get(inode, 411e50e5129SAndreas Dilger le32_to_cpu(entry->e_value_inum), 41290966693STahsin Erdogan buffer, size); 413e50e5129SAndreas Dilger if (error) 414e50e5129SAndreas Dilger goto cleanup; 415e50e5129SAndreas Dilger } else { 416e50e5129SAndreas Dilger memcpy(buffer, bh->b_data + 417e50e5129SAndreas Dilger le16_to_cpu(entry->e_value_offs), size); 418e50e5129SAndreas Dilger } 419ac27a0ecSDave Kleikamp } 420ac27a0ecSDave Kleikamp error = size; 421ac27a0ecSDave Kleikamp 422ac27a0ecSDave Kleikamp cleanup: 423ac27a0ecSDave Kleikamp brelse(bh); 424ac27a0ecSDave Kleikamp return error; 425ac27a0ecSDave Kleikamp } 426ac27a0ecSDave Kleikamp 427879b3825STao Ma int 428617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 429ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 430ac27a0ecSDave Kleikamp { 431617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 432617ba13bSMingming Cao struct ext4_xattr_entry *entry; 433617ba13bSMingming Cao struct ext4_inode *raw_inode; 434617ba13bSMingming Cao struct ext4_iloc iloc; 435ac27a0ecSDave Kleikamp size_t size; 436ac27a0ecSDave Kleikamp void *end; 437ac27a0ecSDave Kleikamp int error; 438ac27a0ecSDave Kleikamp 43919f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 440ac27a0ecSDave Kleikamp return -ENODATA; 441617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 442ac27a0ecSDave Kleikamp if (error) 443ac27a0ecSDave Kleikamp return error; 444617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 445ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 446617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 4479e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 448ac27a0ecSDave Kleikamp if (error) 449ac27a0ecSDave Kleikamp goto cleanup; 4506ba644b9SEric Biggers entry = IFIRST(header); 4516ba644b9SEric Biggers error = ext4_xattr_find_entry(&entry, name_index, name, 0); 452ac27a0ecSDave Kleikamp if (error) 453ac27a0ecSDave Kleikamp goto cleanup; 454ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 455ac27a0ecSDave Kleikamp if (buffer) { 456ac27a0ecSDave Kleikamp error = -ERANGE; 457ac27a0ecSDave Kleikamp if (size > buffer_size) 458ac27a0ecSDave Kleikamp goto cleanup; 459e50e5129SAndreas Dilger if (entry->e_value_inum) { 460e50e5129SAndreas Dilger error = ext4_xattr_inode_get(inode, 461e50e5129SAndreas Dilger le32_to_cpu(entry->e_value_inum), 46290966693STahsin Erdogan buffer, size); 463e50e5129SAndreas Dilger if (error) 464e50e5129SAndreas Dilger goto cleanup; 465e50e5129SAndreas Dilger } else { 466ac27a0ecSDave Kleikamp memcpy(buffer, (void *)IFIRST(header) + 467ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs), size); 468ac27a0ecSDave Kleikamp } 469e50e5129SAndreas Dilger } 470ac27a0ecSDave Kleikamp error = size; 471ac27a0ecSDave Kleikamp 472ac27a0ecSDave Kleikamp cleanup: 473ac27a0ecSDave Kleikamp brelse(iloc.bh); 474ac27a0ecSDave Kleikamp return error; 475ac27a0ecSDave Kleikamp } 476ac27a0ecSDave Kleikamp 477ac27a0ecSDave Kleikamp /* 478617ba13bSMingming Cao * ext4_xattr_get() 479ac27a0ecSDave Kleikamp * 480ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 481ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 482ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 483ac27a0ecSDave Kleikamp * 484ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 485ac27a0ecSDave Kleikamp * used / required on success. 486ac27a0ecSDave Kleikamp */ 487ac27a0ecSDave Kleikamp int 488617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 489ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 490ac27a0ecSDave Kleikamp { 491ac27a0ecSDave Kleikamp int error; 492ac27a0ecSDave Kleikamp 4930db1ff22STheodore Ts'o if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 4940db1ff22STheodore Ts'o return -EIO; 4950db1ff22STheodore Ts'o 496230b8c1aSZhang Zhen if (strlen(name) > 255) 497230b8c1aSZhang Zhen return -ERANGE; 498230b8c1aSZhang Zhen 499617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 500617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 501ac27a0ecSDave Kleikamp buffer_size); 502ac27a0ecSDave Kleikamp if (error == -ENODATA) 503617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 504ac27a0ecSDave Kleikamp buffer_size); 505617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 506ac27a0ecSDave Kleikamp return error; 507ac27a0ecSDave Kleikamp } 508ac27a0ecSDave Kleikamp 509ac27a0ecSDave Kleikamp static int 510431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 511ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 512ac27a0ecSDave Kleikamp { 513ac27a0ecSDave Kleikamp size_t rest = buffer_size; 514ac27a0ecSDave Kleikamp 515617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 51611e27528SStephen Hemminger const struct xattr_handler *handler = 517617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 518ac27a0ecSDave Kleikamp 519764a5c6bSAndreas Gruenbacher if (handler && (!handler->list || handler->list(dentry))) { 520764a5c6bSAndreas Gruenbacher const char *prefix = handler->prefix ?: handler->name; 521764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 522764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 523764a5c6bSAndreas Gruenbacher 524ac27a0ecSDave Kleikamp if (buffer) { 525ac27a0ecSDave Kleikamp if (size > rest) 526ac27a0ecSDave Kleikamp return -ERANGE; 527764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 528764a5c6bSAndreas Gruenbacher buffer += prefix_len; 529764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 530764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 531764a5c6bSAndreas Gruenbacher *buffer++ = 0; 532ac27a0ecSDave Kleikamp } 533ac27a0ecSDave Kleikamp rest -= size; 534ac27a0ecSDave Kleikamp } 535ac27a0ecSDave Kleikamp } 536764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 537ac27a0ecSDave Kleikamp } 538ac27a0ecSDave Kleikamp 539ac27a0ecSDave Kleikamp static int 540431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 541ac27a0ecSDave Kleikamp { 5422b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 543ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 544ac27a0ecSDave Kleikamp int error; 545ac27a0ecSDave Kleikamp 546ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 547ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 548ac27a0ecSDave Kleikamp 549ac27a0ecSDave Kleikamp error = 0; 550617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 551ac27a0ecSDave Kleikamp goto cleanup; 552ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 553ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 554617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 555ac27a0ecSDave Kleikamp error = -EIO; 556ac27a0ecSDave Kleikamp if (!bh) 557ac27a0ecSDave Kleikamp goto cleanup; 558ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 559ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 560cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 56124676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 562617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 5636a797d27SDarrick J. Wong error = -EFSCORRUPTED; 564ac27a0ecSDave Kleikamp goto cleanup; 565ac27a0ecSDave Kleikamp } 566*47387409STahsin Erdogan ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); 567431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); 568ac27a0ecSDave Kleikamp 569ac27a0ecSDave Kleikamp cleanup: 570ac27a0ecSDave Kleikamp brelse(bh); 571ac27a0ecSDave Kleikamp 572ac27a0ecSDave Kleikamp return error; 573ac27a0ecSDave Kleikamp } 574ac27a0ecSDave Kleikamp 575ac27a0ecSDave Kleikamp static int 576431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 577ac27a0ecSDave Kleikamp { 5782b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 579617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 580617ba13bSMingming Cao struct ext4_inode *raw_inode; 581617ba13bSMingming Cao struct ext4_iloc iloc; 582ac27a0ecSDave Kleikamp void *end; 583ac27a0ecSDave Kleikamp int error; 584ac27a0ecSDave Kleikamp 58519f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 586ac27a0ecSDave Kleikamp return 0; 587617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 588ac27a0ecSDave Kleikamp if (error) 589ac27a0ecSDave Kleikamp return error; 590617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 591ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 592617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 5939e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 594ac27a0ecSDave Kleikamp if (error) 595ac27a0ecSDave Kleikamp goto cleanup; 596431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 597ac27a0ecSDave Kleikamp buffer, buffer_size); 598ac27a0ecSDave Kleikamp 599ac27a0ecSDave Kleikamp cleanup: 600ac27a0ecSDave Kleikamp brelse(iloc.bh); 601ac27a0ecSDave Kleikamp return error; 602ac27a0ecSDave Kleikamp } 603ac27a0ecSDave Kleikamp 604ac27a0ecSDave Kleikamp /* 605ba7ea1d8SEric Biggers * Inode operation listxattr() 606ba7ea1d8SEric Biggers * 607ba7ea1d8SEric Biggers * d_inode(dentry)->i_rwsem: don't care 608ac27a0ecSDave Kleikamp * 609ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 610ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 611ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 612ac27a0ecSDave Kleikamp * 613ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 614ac27a0ecSDave Kleikamp * used / required on success. 615ac27a0ecSDave Kleikamp */ 616ba7ea1d8SEric Biggers ssize_t 617ba7ea1d8SEric Biggers ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) 618ac27a0ecSDave Kleikamp { 619eaeef867STheodore Ts'o int ret, ret2; 620ac27a0ecSDave Kleikamp 6212b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 622eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 623eaeef867STheodore Ts'o if (ret < 0) 624eaeef867STheodore Ts'o goto errout; 625ac27a0ecSDave Kleikamp if (buffer) { 626eaeef867STheodore Ts'o buffer += ret; 627eaeef867STheodore Ts'o buffer_size -= ret; 628ac27a0ecSDave Kleikamp } 629eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 630eaeef867STheodore Ts'o if (ret < 0) 631eaeef867STheodore Ts'o goto errout; 632eaeef867STheodore Ts'o ret += ret2; 633eaeef867STheodore Ts'o errout: 6342b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 635eaeef867STheodore Ts'o return ret; 636ac27a0ecSDave Kleikamp } 637ac27a0ecSDave Kleikamp 638ac27a0ecSDave Kleikamp /* 639617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 640ac27a0ecSDave Kleikamp * not set, set it. 641ac27a0ecSDave Kleikamp */ 642617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 643ac27a0ecSDave Kleikamp struct super_block *sb) 644ac27a0ecSDave Kleikamp { 645e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 646ac27a0ecSDave Kleikamp return; 647ac27a0ecSDave Kleikamp 6485d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 649617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 650e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 651a0375156STheodore Ts'o ext4_handle_dirty_super(handle, sb); 652ac27a0ecSDave Kleikamp } 653ac27a0ecSDave Kleikamp } 654ac27a0ecSDave Kleikamp 655ac27a0ecSDave Kleikamp /* 656ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 657ec4cb1aaSJan Kara * otherwise free the block. 658ac27a0ecSDave Kleikamp */ 659ac27a0ecSDave Kleikamp static void 660617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 661ac27a0ecSDave Kleikamp struct buffer_head *bh) 662ac27a0ecSDave Kleikamp { 663*47387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 6646048c64bSAndreas Gruenbacher u32 hash, ref; 6658a2bfdcbSMingming Cao int error = 0; 666ac27a0ecSDave Kleikamp 6675d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 6688a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 6698a2bfdcbSMingming Cao if (error) 6708a2bfdcbSMingming Cao goto out; 6718a2bfdcbSMingming Cao 6728a2bfdcbSMingming Cao lock_buffer(bh); 6736048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 6746048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 6756048c64bSAndreas Gruenbacher if (ref == 1) { 676ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 67782939d79SJan Kara /* 67882939d79SJan Kara * This must happen under buffer lock for 67982939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 68082939d79SJan Kara */ 681*47387409STahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, bh->b_blocknr); 682ac27a0ecSDave Kleikamp get_bh(bh); 683ec4cb1aaSJan Kara unlock_buffer(bh); 684e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 685e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 686e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 687ac27a0ecSDave Kleikamp } else { 6886048c64bSAndreas Gruenbacher ref--; 6896048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 6906048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 6916048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 6926048c64bSAndreas Gruenbacher 693*47387409STahsin Erdogan ce = mb_cache_entry_get(ea_block_cache, hash, 6946048c64bSAndreas Gruenbacher bh->b_blocknr); 6956048c64bSAndreas Gruenbacher if (ce) { 6966048c64bSAndreas Gruenbacher ce->e_reusable = 1; 697*47387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 6986048c64bSAndreas Gruenbacher } 6996048c64bSAndreas Gruenbacher } 7006048c64bSAndreas Gruenbacher 701dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bh); 702ec4cb1aaSJan Kara /* 703ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 704ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 705ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 706ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 707ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 708dac7a4b4STheodore Ts'o * call ext4_handle_dirty_metadata() with locked buffer as 709ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 710ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 711ec4cb1aaSJan Kara */ 712ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 713dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 714c1bb05a6SEric Sandeen unlock_buffer(bh); 715ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 716dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 717ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 7180390131bSFrank Mayhar ext4_handle_sync(handle); 7191231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 720ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 721ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 722ac27a0ecSDave Kleikamp } 7238a2bfdcbSMingming Cao out: 7248a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 7258a2bfdcbSMingming Cao return; 726ac27a0ecSDave Kleikamp } 727ac27a0ecSDave Kleikamp 7286dd4ee7cSKalpak Shah /* 7296dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 7306dd4ee7cSKalpak Shah * bytes used by EA entries. 7316dd4ee7cSKalpak Shah */ 7326dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 7336dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 7346dd4ee7cSKalpak Shah { 7356dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 736e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 7376dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 7386dd4ee7cSKalpak Shah if (offs < *min_offs) 7396dd4ee7cSKalpak Shah *min_offs = offs; 7406dd4ee7cSKalpak Shah } 7417b1b2c1bSTheodore Ts'o if (total) 7427b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 7436dd4ee7cSKalpak Shah } 7446dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 7456dd4ee7cSKalpak Shah } 7466dd4ee7cSKalpak Shah 747e50e5129SAndreas Dilger /* 748e50e5129SAndreas Dilger * Write the value of the EA in an inode. 749e50e5129SAndreas Dilger */ 750e50e5129SAndreas Dilger static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, 751e50e5129SAndreas Dilger const void *buf, int bufsize) 752e50e5129SAndreas Dilger { 753e50e5129SAndreas Dilger struct buffer_head *bh = NULL; 754e50e5129SAndreas Dilger unsigned long block = 0; 755e50e5129SAndreas Dilger unsigned blocksize = ea_inode->i_sb->s_blocksize; 756e50e5129SAndreas Dilger unsigned max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; 757e50e5129SAndreas Dilger int csize, wsize = 0; 758e50e5129SAndreas Dilger int ret = 0; 759e50e5129SAndreas Dilger int retries = 0; 760e50e5129SAndreas Dilger 761e50e5129SAndreas Dilger retry: 762e50e5129SAndreas Dilger while (ret >= 0 && ret < max_blocks) { 763e50e5129SAndreas Dilger struct ext4_map_blocks map; 764e50e5129SAndreas Dilger map.m_lblk = block += ret; 765e50e5129SAndreas Dilger map.m_len = max_blocks -= ret; 766e50e5129SAndreas Dilger 767e50e5129SAndreas Dilger ret = ext4_map_blocks(handle, ea_inode, &map, 768e50e5129SAndreas Dilger EXT4_GET_BLOCKS_CREATE); 769e50e5129SAndreas Dilger if (ret <= 0) { 770e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 771e50e5129SAndreas Dilger if (ret == -ENOSPC && 772e50e5129SAndreas Dilger ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { 773e50e5129SAndreas Dilger ret = 0; 774e50e5129SAndreas Dilger goto retry; 775e50e5129SAndreas Dilger } 776e50e5129SAndreas Dilger break; 777e50e5129SAndreas Dilger } 778e50e5129SAndreas Dilger } 779e50e5129SAndreas Dilger 780e50e5129SAndreas Dilger if (ret < 0) 781e50e5129SAndreas Dilger return ret; 782e50e5129SAndreas Dilger 783e50e5129SAndreas Dilger block = 0; 784e50e5129SAndreas Dilger while (wsize < bufsize) { 785e50e5129SAndreas Dilger if (bh != NULL) 786e50e5129SAndreas Dilger brelse(bh); 787e50e5129SAndreas Dilger csize = (bufsize - wsize) > blocksize ? blocksize : 788e50e5129SAndreas Dilger bufsize - wsize; 789e50e5129SAndreas Dilger bh = ext4_getblk(handle, ea_inode, block, 0); 790e50e5129SAndreas Dilger if (IS_ERR(bh)) 791e50e5129SAndreas Dilger return PTR_ERR(bh); 792e50e5129SAndreas Dilger ret = ext4_journal_get_write_access(handle, bh); 793e50e5129SAndreas Dilger if (ret) 794e50e5129SAndreas Dilger goto out; 795e50e5129SAndreas Dilger 796e50e5129SAndreas Dilger memcpy(bh->b_data, buf, csize); 797e50e5129SAndreas Dilger set_buffer_uptodate(bh); 798e50e5129SAndreas Dilger ext4_handle_dirty_metadata(handle, ea_inode, bh); 799e50e5129SAndreas Dilger 800e50e5129SAndreas Dilger buf += csize; 801e50e5129SAndreas Dilger wsize += csize; 802e50e5129SAndreas Dilger block += 1; 803e50e5129SAndreas Dilger } 804e50e5129SAndreas Dilger 805e50e5129SAndreas Dilger inode_lock(ea_inode); 806e50e5129SAndreas Dilger i_size_write(ea_inode, wsize); 807e50e5129SAndreas Dilger ext4_update_i_disksize(ea_inode, wsize); 808e50e5129SAndreas Dilger inode_unlock(ea_inode); 809e50e5129SAndreas Dilger 810e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 811e50e5129SAndreas Dilger 812e50e5129SAndreas Dilger out: 813e50e5129SAndreas Dilger brelse(bh); 814e50e5129SAndreas Dilger 815e50e5129SAndreas Dilger return ret; 816e50e5129SAndreas Dilger } 817e50e5129SAndreas Dilger 818e50e5129SAndreas Dilger /* 819e50e5129SAndreas Dilger * Create an inode to store the value of a large EA. 820e50e5129SAndreas Dilger */ 821e50e5129SAndreas Dilger static struct inode *ext4_xattr_inode_create(handle_t *handle, 822e50e5129SAndreas Dilger struct inode *inode) 823e50e5129SAndreas Dilger { 824e50e5129SAndreas Dilger struct inode *ea_inode = NULL; 8259e1ba001STahsin Erdogan uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; 826bd3b963bSTahsin Erdogan int err; 827e50e5129SAndreas Dilger 828e50e5129SAndreas Dilger /* 829e50e5129SAndreas Dilger * Let the next inode be the goal, so we try and allocate the EA inode 830e50e5129SAndreas Dilger * in the same group, or nearby one. 831e50e5129SAndreas Dilger */ 832e50e5129SAndreas Dilger ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, 8339e1ba001STahsin Erdogan S_IFREG | 0600, NULL, inode->i_ino + 1, owner, 8341b917ed8STahsin Erdogan EXT4_EA_INODE_FL); 835e50e5129SAndreas Dilger if (!IS_ERR(ea_inode)) { 836e50e5129SAndreas Dilger ea_inode->i_op = &ext4_file_inode_operations; 837e50e5129SAndreas Dilger ea_inode->i_fop = &ext4_file_operations; 838e50e5129SAndreas Dilger ext4_set_aops(ea_inode); 83933d201e0STahsin Erdogan ext4_xattr_inode_set_class(ea_inode); 840e50e5129SAndreas Dilger ea_inode->i_generation = inode->i_generation; 841e50e5129SAndreas Dilger EXT4_I(ea_inode)->i_flags |= EXT4_EA_INODE_FL; 842e50e5129SAndreas Dilger 843e50e5129SAndreas Dilger /* 844e50e5129SAndreas Dilger * A back-pointer from EA inode to parent inode will be useful 845e50e5129SAndreas Dilger * for e2fsck. 846e50e5129SAndreas Dilger */ 847e50e5129SAndreas Dilger EXT4_XATTR_INODE_SET_PARENT(ea_inode, inode->i_ino); 848e50e5129SAndreas Dilger unlock_new_inode(ea_inode); 849bd3b963bSTahsin Erdogan err = ext4_inode_attach_jinode(ea_inode); 850bd3b963bSTahsin Erdogan if (err) { 851bd3b963bSTahsin Erdogan iput(ea_inode); 852bd3b963bSTahsin Erdogan return ERR_PTR(err); 853bd3b963bSTahsin Erdogan } 854e50e5129SAndreas Dilger } 855e50e5129SAndreas Dilger 856e50e5129SAndreas Dilger return ea_inode; 857e50e5129SAndreas Dilger } 858e50e5129SAndreas Dilger 859e50e5129SAndreas Dilger /* 860e50e5129SAndreas Dilger * Unlink the inode storing the value of the EA. 861e50e5129SAndreas Dilger */ 862e50e5129SAndreas Dilger int ext4_xattr_inode_unlink(struct inode *inode, unsigned long ea_ino) 863e50e5129SAndreas Dilger { 864e50e5129SAndreas Dilger struct inode *ea_inode = NULL; 865e50e5129SAndreas Dilger int err; 866e50e5129SAndreas Dilger 867bab79b04STahsin Erdogan err = ext4_xattr_inode_iget(inode, ea_ino, &ea_inode); 868e50e5129SAndreas Dilger if (err) 869e50e5129SAndreas Dilger return err; 870e50e5129SAndreas Dilger 871e50e5129SAndreas Dilger clear_nlink(ea_inode); 872e50e5129SAndreas Dilger iput(ea_inode); 873e50e5129SAndreas Dilger 874e50e5129SAndreas Dilger return 0; 875e50e5129SAndreas Dilger } 876e50e5129SAndreas Dilger 877e50e5129SAndreas Dilger /* 878e50e5129SAndreas Dilger * Add value of the EA in an inode. 879e50e5129SAndreas Dilger */ 880e50e5129SAndreas Dilger static int ext4_xattr_inode_set(handle_t *handle, struct inode *inode, 881e50e5129SAndreas Dilger unsigned long *ea_ino, const void *value, 882e50e5129SAndreas Dilger size_t value_len) 883e50e5129SAndreas Dilger { 884e50e5129SAndreas Dilger struct inode *ea_inode; 885e50e5129SAndreas Dilger int err; 886e50e5129SAndreas Dilger 887e50e5129SAndreas Dilger /* Create an inode for the EA value */ 888e50e5129SAndreas Dilger ea_inode = ext4_xattr_inode_create(handle, inode); 889e50e5129SAndreas Dilger if (IS_ERR(ea_inode)) 890e50e5129SAndreas Dilger return PTR_ERR(ea_inode); 891e50e5129SAndreas Dilger 892e50e5129SAndreas Dilger err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); 893e50e5129SAndreas Dilger if (err) 894e50e5129SAndreas Dilger clear_nlink(ea_inode); 895e50e5129SAndreas Dilger else 896e50e5129SAndreas Dilger *ea_ino = ea_inode->i_ino; 897e50e5129SAndreas Dilger 898e50e5129SAndreas Dilger iput(ea_inode); 899e50e5129SAndreas Dilger 900e50e5129SAndreas Dilger return err; 901e50e5129SAndreas Dilger } 902e50e5129SAndreas Dilger 903e50e5129SAndreas Dilger static int ext4_xattr_set_entry(struct ext4_xattr_info *i, 904e50e5129SAndreas Dilger struct ext4_xattr_search *s, 905e50e5129SAndreas Dilger handle_t *handle, struct inode *inode) 906ac27a0ecSDave Kleikamp { 907617ba13bSMingming Cao struct ext4_xattr_entry *last; 908ac27a0ecSDave Kleikamp size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); 909e50e5129SAndreas Dilger int in_inode = i->in_inode; 910e50e5129SAndreas Dilger int rc; 911e50e5129SAndreas Dilger 912ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 913ac27a0ecSDave Kleikamp last = s->first; 914617ba13bSMingming Cao for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 915e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 916ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 917ac27a0ecSDave Kleikamp if (offs < min_offs) 918ac27a0ecSDave Kleikamp min_offs = offs; 919ac27a0ecSDave Kleikamp } 920ac27a0ecSDave Kleikamp } 921ac27a0ecSDave Kleikamp free = min_offs - ((void *)last - s->base) - sizeof(__u32); 922ac27a0ecSDave Kleikamp if (!s->not_found) { 923e50e5129SAndreas Dilger if (!in_inode && 924e50e5129SAndreas Dilger !s->here->e_value_inum && s->here->e_value_size) { 925ac27a0ecSDave Kleikamp size_t size = le32_to_cpu(s->here->e_value_size); 926617ba13bSMingming Cao free += EXT4_XATTR_SIZE(size); 927ac27a0ecSDave Kleikamp } 928617ba13bSMingming Cao free += EXT4_XATTR_LEN(name_len); 929ac27a0ecSDave Kleikamp } 930ac27a0ecSDave Kleikamp if (i->value) { 931e50e5129SAndreas Dilger size_t value_len = EXT4_XATTR_SIZE(i->value_len); 932e50e5129SAndreas Dilger 933e50e5129SAndreas Dilger if (in_inode) 934e50e5129SAndreas Dilger value_len = 0; 935e50e5129SAndreas Dilger 936e50e5129SAndreas Dilger if (free < EXT4_XATTR_LEN(name_len) + value_len) 937ac27a0ecSDave Kleikamp return -ENOSPC; 938ac27a0ecSDave Kleikamp } 939ac27a0ecSDave Kleikamp 940ac27a0ecSDave Kleikamp if (i->value && s->not_found) { 941ac27a0ecSDave Kleikamp /* Insert the new name. */ 942617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 943ac27a0ecSDave Kleikamp size_t rest = (void *)last - (void *)s->here + sizeof(__u32); 944ac27a0ecSDave Kleikamp memmove((void *)s->here + size, s->here, rest); 945ac27a0ecSDave Kleikamp memset(s->here, 0, size); 946ac27a0ecSDave Kleikamp s->here->e_name_index = i->name_index; 947ac27a0ecSDave Kleikamp s->here->e_name_len = name_len; 948ac27a0ecSDave Kleikamp memcpy(s->here->e_name, i->name, name_len); 949ac27a0ecSDave Kleikamp } else { 950e50e5129SAndreas Dilger if (!s->here->e_value_inum && s->here->e_value_size && 951e50e5129SAndreas Dilger s->here->e_value_offs > 0) { 952ac27a0ecSDave Kleikamp void *first_val = s->base + min_offs; 953ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(s->here->e_value_offs); 954ac27a0ecSDave Kleikamp void *val = s->base + offs; 955617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE( 956ac27a0ecSDave Kleikamp le32_to_cpu(s->here->e_value_size)); 957ac27a0ecSDave Kleikamp 958617ba13bSMingming Cao if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { 959ac27a0ecSDave Kleikamp /* The old and the new value have the same 960ac27a0ecSDave Kleikamp size. Just replace. */ 961ac27a0ecSDave Kleikamp s->here->e_value_size = 962ac27a0ecSDave Kleikamp cpu_to_le32(i->value_len); 963bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 964bd9926e8STheodore Ts'o memset(val, 0, size); 965bd9926e8STheodore Ts'o } else { 966bd9926e8STheodore Ts'o /* Clear pad bytes first. */ 967617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 968bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 969ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 970bd9926e8STheodore Ts'o } 971ac27a0ecSDave Kleikamp return 0; 972ac27a0ecSDave Kleikamp } 973ac27a0ecSDave Kleikamp 974ac27a0ecSDave Kleikamp /* Remove the old value. */ 975ac27a0ecSDave Kleikamp memmove(first_val + size, first_val, val - first_val); 976ac27a0ecSDave Kleikamp memset(first_val, 0, size); 977ac27a0ecSDave Kleikamp s->here->e_value_size = 0; 978ac27a0ecSDave Kleikamp s->here->e_value_offs = 0; 979ac27a0ecSDave Kleikamp min_offs += size; 980ac27a0ecSDave Kleikamp 981ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 982ac27a0ecSDave Kleikamp last = s->first; 983ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 984ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 985e50e5129SAndreas Dilger if (!last->e_value_inum && 986e50e5129SAndreas Dilger last->e_value_size && o < offs) 987ac27a0ecSDave Kleikamp last->e_value_offs = 988ac27a0ecSDave Kleikamp cpu_to_le16(o + size); 989617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 990ac27a0ecSDave Kleikamp } 991ac27a0ecSDave Kleikamp } 992e50e5129SAndreas Dilger if (s->here->e_value_inum) { 993e50e5129SAndreas Dilger ext4_xattr_inode_unlink(inode, 994e50e5129SAndreas Dilger le32_to_cpu(s->here->e_value_inum)); 995e50e5129SAndreas Dilger s->here->e_value_inum = 0; 996e50e5129SAndreas Dilger } 997ac27a0ecSDave Kleikamp if (!i->value) { 998ac27a0ecSDave Kleikamp /* Remove the old name. */ 999617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 1000ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 1001ac27a0ecSDave Kleikamp memmove(s->here, (void *)s->here + size, 1002ac27a0ecSDave Kleikamp (void *)last - (void *)s->here + sizeof(__u32)); 1003ac27a0ecSDave Kleikamp memset(last, 0, size); 1004ac27a0ecSDave Kleikamp } 1005ac27a0ecSDave Kleikamp } 1006ac27a0ecSDave Kleikamp 1007ac27a0ecSDave Kleikamp if (i->value) { 1008ac27a0ecSDave Kleikamp /* Insert the new value. */ 1009e50e5129SAndreas Dilger if (in_inode) { 1010e50e5129SAndreas Dilger unsigned long ea_ino = 1011e50e5129SAndreas Dilger le32_to_cpu(s->here->e_value_inum); 1012e50e5129SAndreas Dilger rc = ext4_xattr_inode_set(handle, inode, &ea_ino, 1013e50e5129SAndreas Dilger i->value, i->value_len); 1014e50e5129SAndreas Dilger if (rc) 1015e50e5129SAndreas Dilger goto out; 1016e50e5129SAndreas Dilger s->here->e_value_inum = cpu_to_le32(ea_ino); 1017e50e5129SAndreas Dilger s->here->e_value_offs = 0; 1018e50e5129SAndreas Dilger } else if (i->value_len) { 1019617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE(i->value_len); 1020ac27a0ecSDave Kleikamp void *val = s->base + min_offs - size; 1021ac27a0ecSDave Kleikamp s->here->e_value_offs = cpu_to_le16(min_offs - size); 1022e50e5129SAndreas Dilger s->here->e_value_inum = 0; 1023bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 1024bd9926e8STheodore Ts'o memset(val, 0, size); 1025bd9926e8STheodore Ts'o } else { 1026bd9926e8STheodore Ts'o /* Clear the pad bytes first. */ 1027617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 1028bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 1029ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 1030ac27a0ecSDave Kleikamp } 1031ac27a0ecSDave Kleikamp } 1032e50e5129SAndreas Dilger s->here->e_value_size = cpu_to_le32(i->value_len); 1033bd9926e8STheodore Ts'o } 1034e50e5129SAndreas Dilger 1035e50e5129SAndreas Dilger out: 1036e50e5129SAndreas Dilger return rc; 1037ac27a0ecSDave Kleikamp } 1038ac27a0ecSDave Kleikamp 1039617ba13bSMingming Cao struct ext4_xattr_block_find { 1040617ba13bSMingming Cao struct ext4_xattr_search s; 1041ac27a0ecSDave Kleikamp struct buffer_head *bh; 1042ac27a0ecSDave Kleikamp }; 1043ac27a0ecSDave Kleikamp 1044ac27a0ecSDave Kleikamp static int 1045617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 1046617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1047ac27a0ecSDave Kleikamp { 1048ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1049ac27a0ecSDave Kleikamp int error; 1050ac27a0ecSDave Kleikamp 1051ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 1052ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 1053ac27a0ecSDave Kleikamp 1054617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 1055ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 1056617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 1057ac27a0ecSDave Kleikamp error = -EIO; 1058ac27a0ecSDave Kleikamp if (!bs->bh) 1059ac27a0ecSDave Kleikamp goto cleanup; 1060ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 1061ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 1062ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 1063cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bs->bh)) { 106424676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 106524676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 10666a797d27SDarrick J. Wong error = -EFSCORRUPTED; 1067ac27a0ecSDave Kleikamp goto cleanup; 1068ac27a0ecSDave Kleikamp } 1069ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1070ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 1071ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 1072ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 1073ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 1074617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 10756ba644b9SEric Biggers i->name, 1); 1076ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1077ac27a0ecSDave Kleikamp goto cleanup; 1078ac27a0ecSDave Kleikamp bs->s.not_found = error; 1079ac27a0ecSDave Kleikamp } 1080ac27a0ecSDave Kleikamp error = 0; 1081ac27a0ecSDave Kleikamp 1082ac27a0ecSDave Kleikamp cleanup: 1083ac27a0ecSDave Kleikamp return error; 1084ac27a0ecSDave Kleikamp } 1085ac27a0ecSDave Kleikamp 1086ac27a0ecSDave Kleikamp static int 1087617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 1088617ba13bSMingming Cao struct ext4_xattr_info *i, 1089617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1090ac27a0ecSDave Kleikamp { 1091ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1092ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 1093b347e2bcSTahsin Erdogan struct ext4_xattr_search s_copy = bs->s; 1094b347e2bcSTahsin Erdogan struct ext4_xattr_search *s = &s_copy; 10957a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 10968a2bfdcbSMingming Cao int error = 0; 1097*47387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 1098ac27a0ecSDave Kleikamp 1099617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 1100ac27a0ecSDave Kleikamp 1101ac27a0ecSDave Kleikamp if (s->base) { 11025d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 11038a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 11048a2bfdcbSMingming Cao if (error) 11058a2bfdcbSMingming Cao goto cleanup; 11068a2bfdcbSMingming Cao lock_buffer(bs->bh); 11078a2bfdcbSMingming Cao 1108ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 110982939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 111082939d79SJan Kara 111182939d79SJan Kara /* 111282939d79SJan Kara * This must happen under buffer lock for 111382939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 111482939d79SJan Kara * block 111582939d79SJan Kara */ 1116*47387409STahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, 111782939d79SJan Kara bs->bh->b_blocknr); 1118ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 1119e50e5129SAndreas Dilger error = ext4_xattr_set_entry(i, s, handle, inode); 1120ac27a0ecSDave Kleikamp if (!error) { 1121ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 1122617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), 1123ac27a0ecSDave Kleikamp s->here); 1124*47387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, 11259c191f70ST Makphaibulchoke bs->bh); 1126ac27a0ecSDave Kleikamp } 1127dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bs->bh); 1128ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 11296a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1130ac27a0ecSDave Kleikamp goto bad_block; 1131ac27a0ecSDave Kleikamp if (!error) 1132dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 11330390131bSFrank Mayhar inode, 1134ac27a0ecSDave Kleikamp bs->bh); 1135ac27a0ecSDave Kleikamp if (error) 1136ac27a0ecSDave Kleikamp goto cleanup; 1137ac27a0ecSDave Kleikamp goto inserted; 1138ac27a0ecSDave Kleikamp } else { 1139ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 1140ac27a0ecSDave Kleikamp 11418a2bfdcbSMingming Cao unlock_buffer(bs->bh); 1142ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 1143216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 1144ac27a0ecSDave Kleikamp error = -ENOMEM; 1145ac27a0ecSDave Kleikamp if (s->base == NULL) 1146ac27a0ecSDave Kleikamp goto cleanup; 1147ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 1148ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1149ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1150ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 1151ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 1152ac27a0ecSDave Kleikamp } 1153ac27a0ecSDave Kleikamp } else { 1154ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 1155216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 1156ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 1157ac27a0ecSDave Kleikamp error = -ENOMEM; 1158ac27a0ecSDave Kleikamp if (s->base == NULL) 1159ac27a0ecSDave Kleikamp goto cleanup; 1160617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 1161ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 1162ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1163ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1164ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 1165ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 1166ac27a0ecSDave Kleikamp } 1167ac27a0ecSDave Kleikamp 1168e50e5129SAndreas Dilger error = ext4_xattr_set_entry(i, s, handle, inode); 11696a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1170ac27a0ecSDave Kleikamp goto bad_block; 1171ac27a0ecSDave Kleikamp if (error) 1172ac27a0ecSDave Kleikamp goto cleanup; 1173ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 1174617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), s->here); 1175ac27a0ecSDave Kleikamp 1176ac27a0ecSDave Kleikamp inserted: 1177ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 1178*47387409STahsin Erdogan new_bh = ext4_xattr_block_cache_find(inode, header(s->base), 1179*47387409STahsin Erdogan &ce); 1180ac27a0ecSDave Kleikamp if (new_bh) { 1181ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 1182ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 1183ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 1184ac27a0ecSDave Kleikamp else { 11856048c64bSAndreas Gruenbacher u32 ref; 11866048c64bSAndreas Gruenbacher 1187b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 1188b8cb5a54STahsin Erdogan 1189ac27a0ecSDave Kleikamp /* The old block is released after updating 1190ac27a0ecSDave Kleikamp the inode. */ 11911231b3a1SLukas Czerner error = dquot_alloc_block(inode, 11921231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 11935dd4056dSChristoph Hellwig if (error) 1194ac27a0ecSDave Kleikamp goto cleanup; 11955d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 1196617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 1197ac27a0ecSDave Kleikamp new_bh); 1198ac27a0ecSDave Kleikamp if (error) 1199ac27a0ecSDave Kleikamp goto cleanup_dquot; 1200ac27a0ecSDave Kleikamp lock_buffer(new_bh); 120182939d79SJan Kara /* 120282939d79SJan Kara * We have to be careful about races with 12036048c64bSAndreas Gruenbacher * freeing, rehashing or adding references to 12046048c64bSAndreas Gruenbacher * xattr block. Once we hold buffer lock xattr 12056048c64bSAndreas Gruenbacher * block's state is stable so we can check 12066048c64bSAndreas Gruenbacher * whether the block got freed / rehashed or 12076048c64bSAndreas Gruenbacher * not. Since we unhash mbcache entry under 12086048c64bSAndreas Gruenbacher * buffer lock when freeing / rehashing xattr 12096048c64bSAndreas Gruenbacher * block, checking whether entry is still 12106048c64bSAndreas Gruenbacher * hashed is reliable. Same rules hold for 12116048c64bSAndreas Gruenbacher * e_reusable handling. 121282939d79SJan Kara */ 12136048c64bSAndreas Gruenbacher if (hlist_bl_unhashed(&ce->e_hash_list) || 12146048c64bSAndreas Gruenbacher !ce->e_reusable) { 121582939d79SJan Kara /* 121682939d79SJan Kara * Undo everything and check mbcache 121782939d79SJan Kara * again. 121882939d79SJan Kara */ 121982939d79SJan Kara unlock_buffer(new_bh); 122082939d79SJan Kara dquot_free_block(inode, 122182939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 122282939d79SJan Kara 1)); 122382939d79SJan Kara brelse(new_bh); 1224*47387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 122582939d79SJan Kara ce = NULL; 122682939d79SJan Kara new_bh = NULL; 122782939d79SJan Kara goto inserted; 122882939d79SJan Kara } 12296048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 12306048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 12316048c64bSAndreas Gruenbacher if (ref >= EXT4_XATTR_REFCOUNT_MAX) 12326048c64bSAndreas Gruenbacher ce->e_reusable = 0; 1233ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 12346048c64bSAndreas Gruenbacher ref); 1235dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 1236ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 1237dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 12380390131bSFrank Mayhar inode, 1239ac27a0ecSDave Kleikamp new_bh); 1240ac27a0ecSDave Kleikamp if (error) 1241ac27a0ecSDave Kleikamp goto cleanup_dquot; 1242ac27a0ecSDave Kleikamp } 1243*47387409STahsin Erdogan mb_cache_entry_touch(ea_block_cache, ce); 1244*47387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 1245ac27a0ecSDave Kleikamp ce = NULL; 1246ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 1247ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 1248ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 1249ac27a0ecSDave Kleikamp new_bh = bs->bh; 1250ac27a0ecSDave Kleikamp get_bh(new_bh); 1251ac27a0ecSDave Kleikamp } else { 1252ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 1253fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 1254fb0a387dSEric Sandeen 1255b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 1256b8cb5a54STahsin Erdogan 1257fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 1258d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 1259fb0a387dSEric Sandeen 1260fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 126112e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 1262fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 1263fb0a387dSEric Sandeen 126455f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 126555f020dbSAllison Henderson NULL, &error); 1266ac27a0ecSDave Kleikamp if (error) 1267ac27a0ecSDave Kleikamp goto cleanup; 1268fb0a387dSEric Sandeen 126912e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 1270fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 1271fb0a387dSEric Sandeen 1272ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 1273ace36ad4SJoe Perches (unsigned long long)block); 1274ac27a0ecSDave Kleikamp 1275ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 1276aebf0243SWang Shilong if (unlikely(!new_bh)) { 1277860d21e2STheodore Ts'o error = -ENOMEM; 1278ac27a0ecSDave Kleikamp getblk_failed: 12797dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 1280e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 1281ac27a0ecSDave Kleikamp goto cleanup; 1282ac27a0ecSDave Kleikamp } 1283ac27a0ecSDave Kleikamp lock_buffer(new_bh); 1284617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 1285ac27a0ecSDave Kleikamp if (error) { 1286ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 1287860d21e2STheodore Ts'o error = -EIO; 1288ac27a0ecSDave Kleikamp goto getblk_failed; 1289ac27a0ecSDave Kleikamp } 1290ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 1291dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 1292ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 1293ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 1294*47387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, new_bh); 1295dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, 1296dac7a4b4STheodore Ts'o new_bh); 1297ac27a0ecSDave Kleikamp if (error) 1298ac27a0ecSDave Kleikamp goto cleanup; 1299ac27a0ecSDave Kleikamp } 1300ac27a0ecSDave Kleikamp } 1301ac27a0ecSDave Kleikamp 1302ac27a0ecSDave Kleikamp /* Update the inode. */ 1303617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 1304ac27a0ecSDave Kleikamp 1305ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 1306ac27a0ecSDave Kleikamp if (bs->bh && bs->bh != new_bh) 1307617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bs->bh); 1308ac27a0ecSDave Kleikamp error = 0; 1309ac27a0ecSDave Kleikamp 1310ac27a0ecSDave Kleikamp cleanup: 1311ac27a0ecSDave Kleikamp if (ce) 1312*47387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 1313ac27a0ecSDave Kleikamp brelse(new_bh); 1314ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 1315ac27a0ecSDave Kleikamp kfree(s->base); 1316ac27a0ecSDave Kleikamp 1317ac27a0ecSDave Kleikamp return error; 1318ac27a0ecSDave Kleikamp 1319ac27a0ecSDave Kleikamp cleanup_dquot: 13201231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 1321ac27a0ecSDave Kleikamp goto cleanup; 1322ac27a0ecSDave Kleikamp 1323ac27a0ecSDave Kleikamp bad_block: 132424676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 132524676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1326ac27a0ecSDave Kleikamp goto cleanup; 1327ac27a0ecSDave Kleikamp 1328ac27a0ecSDave Kleikamp #undef header 1329ac27a0ecSDave Kleikamp } 1330ac27a0ecSDave Kleikamp 1331879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 1332617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 1333ac27a0ecSDave Kleikamp { 1334617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 1335617ba13bSMingming Cao struct ext4_inode *raw_inode; 1336ac27a0ecSDave Kleikamp int error; 1337ac27a0ecSDave Kleikamp 1338617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 1339ac27a0ecSDave Kleikamp return 0; 1340617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 1341ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 1342ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 1343ac27a0ecSDave Kleikamp is->s.here = is->s.first; 1344617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 134519f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 13469e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 1347ac27a0ecSDave Kleikamp if (error) 1348ac27a0ecSDave Kleikamp return error; 1349ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1350617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 13516ba644b9SEric Biggers i->name, 0); 1352ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1353ac27a0ecSDave Kleikamp return error; 1354ac27a0ecSDave Kleikamp is->s.not_found = error; 1355ac27a0ecSDave Kleikamp } 1356ac27a0ecSDave Kleikamp return 0; 1357ac27a0ecSDave Kleikamp } 1358ac27a0ecSDave Kleikamp 13590d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 13600d812f77STao Ma struct ext4_xattr_info *i, 13610d812f77STao Ma struct ext4_xattr_ibody_find *is) 13620d812f77STao Ma { 13630d812f77STao Ma struct ext4_xattr_ibody_header *header; 13640d812f77STao Ma struct ext4_xattr_search *s = &is->s; 13650d812f77STao Ma int error; 13660d812f77STao Ma 13670d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 13680d812f77STao Ma return -ENOSPC; 1369e50e5129SAndreas Dilger error = ext4_xattr_set_entry(i, s, handle, inode); 13700d812f77STao Ma if (error) { 13710d812f77STao Ma if (error == -ENOSPC && 13720d812f77STao Ma ext4_has_inline_data(inode)) { 13730d812f77STao Ma error = ext4_try_to_evict_inline_data(handle, inode, 13740d812f77STao Ma EXT4_XATTR_LEN(strlen(i->name) + 13750d812f77STao Ma EXT4_XATTR_SIZE(i->value_len))); 13760d812f77STao Ma if (error) 13770d812f77STao Ma return error; 13780d812f77STao Ma error = ext4_xattr_ibody_find(inode, i, is); 13790d812f77STao Ma if (error) 13800d812f77STao Ma return error; 1381e50e5129SAndreas Dilger error = ext4_xattr_set_entry(i, s, handle, inode); 13820d812f77STao Ma } 13830d812f77STao Ma if (error) 13840d812f77STao Ma return error; 13850d812f77STao Ma } 13860d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 13870d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 13880d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 13890d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 13900d812f77STao Ma } else { 13910d812f77STao Ma header->h_magic = cpu_to_le32(0); 13920d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 13930d812f77STao Ma } 13940d812f77STao Ma return 0; 13950d812f77STao Ma } 13960d812f77STao Ma 1397e50e5129SAndreas Dilger static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 1398617ba13bSMingming Cao struct ext4_xattr_info *i, 1399617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 1400ac27a0ecSDave Kleikamp { 1401617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 1402617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 1403ac27a0ecSDave Kleikamp int error; 1404ac27a0ecSDave Kleikamp 1405617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 1406ac27a0ecSDave Kleikamp return -ENOSPC; 1407e50e5129SAndreas Dilger error = ext4_xattr_set_entry(i, s, handle, inode); 1408ac27a0ecSDave Kleikamp if (error) 1409ac27a0ecSDave Kleikamp return error; 1410617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 1411ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 1412617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 141319f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 1414ac27a0ecSDave Kleikamp } else { 1415ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 141619f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 1417ac27a0ecSDave Kleikamp } 1418ac27a0ecSDave Kleikamp return 0; 1419ac27a0ecSDave Kleikamp } 1420ac27a0ecSDave Kleikamp 14213fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 14223fd16462SJan Kara struct ext4_xattr_info *i) 14233fd16462SJan Kara { 14243fd16462SJan Kara void *value; 14253fd16462SJan Kara 14260bd454c0STahsin Erdogan /* When e_value_inum is set the value is stored externally. */ 14270bd454c0STahsin Erdogan if (s->here->e_value_inum) 14280bd454c0STahsin Erdogan return 0; 14293fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 14303fd16462SJan Kara return 0; 14313fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 14323fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 14333fd16462SJan Kara } 14343fd16462SJan Kara 1435ac27a0ecSDave Kleikamp /* 1436617ba13bSMingming Cao * ext4_xattr_set_handle() 1437ac27a0ecSDave Kleikamp * 14386e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 1439ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 1440ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 1441ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 1442ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 1443ac27a0ecSDave Kleikamp * previous to the call, respectively. 1444ac27a0ecSDave Kleikamp * 1445ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1446ac27a0ecSDave Kleikamp */ 1447ac27a0ecSDave Kleikamp int 1448617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 1449ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 1450ac27a0ecSDave Kleikamp int flags) 1451ac27a0ecSDave Kleikamp { 1452617ba13bSMingming Cao struct ext4_xattr_info i = { 1453ac27a0ecSDave Kleikamp .name_index = name_index, 1454ac27a0ecSDave Kleikamp .name = name, 1455ac27a0ecSDave Kleikamp .value = value, 1456ac27a0ecSDave Kleikamp .value_len = value_len, 1457e50e5129SAndreas Dilger .in_inode = 0, 1458ac27a0ecSDave Kleikamp }; 1459617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 1460ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1461ac27a0ecSDave Kleikamp }; 1462617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 1463ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1464ac27a0ecSDave Kleikamp }; 1465c755e251STheodore Ts'o int no_expand; 1466ac27a0ecSDave Kleikamp int error; 1467ac27a0ecSDave Kleikamp 1468ac27a0ecSDave Kleikamp if (!name) 1469ac27a0ecSDave Kleikamp return -EINVAL; 1470ac27a0ecSDave Kleikamp if (strlen(name) > 255) 1471ac27a0ecSDave Kleikamp return -ERANGE; 1472b8cb5a54STahsin Erdogan 1473c755e251STheodore Ts'o ext4_write_lock_xattr(inode, &no_expand); 14744d20c685SKalpak Shah 1475c1a5d5f6STahsin Erdogan /* Check journal credits under write lock. */ 1476c1a5d5f6STahsin Erdogan if (ext4_handle_valid(handle)) { 1477c1a5d5f6STahsin Erdogan int credits; 1478c1a5d5f6STahsin Erdogan 1479c1a5d5f6STahsin Erdogan credits = ext4_xattr_set_credits(inode, value_len); 1480c1a5d5f6STahsin Erdogan if (!ext4_handle_has_enough_credits(handle, credits)) { 1481c1a5d5f6STahsin Erdogan error = -ENOSPC; 1482c1a5d5f6STahsin Erdogan goto cleanup; 1483c1a5d5f6STahsin Erdogan } 1484c1a5d5f6STahsin Erdogan } 1485c1a5d5f6STahsin Erdogan 148666543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 148786ebfd08SEric Sandeen if (error) 148886ebfd08SEric Sandeen goto cleanup; 148986ebfd08SEric Sandeen 149019f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 1491617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 1492617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 149319f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 1494ac27a0ecSDave Kleikamp } 1495ac27a0ecSDave Kleikamp 1496617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 1497ac27a0ecSDave Kleikamp if (error) 1498ac27a0ecSDave Kleikamp goto cleanup; 1499ac27a0ecSDave Kleikamp if (is.s.not_found) 1500617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 1501ac27a0ecSDave Kleikamp if (error) 1502ac27a0ecSDave Kleikamp goto cleanup; 1503ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 1504ac27a0ecSDave Kleikamp error = -ENODATA; 1505ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 1506ac27a0ecSDave Kleikamp goto cleanup; 1507ac27a0ecSDave Kleikamp error = 0; 1508ac27a0ecSDave Kleikamp if (!value) 1509ac27a0ecSDave Kleikamp goto cleanup; 1510ac27a0ecSDave Kleikamp } else { 1511ac27a0ecSDave Kleikamp error = -EEXIST; 1512ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 1513ac27a0ecSDave Kleikamp goto cleanup; 1514ac27a0ecSDave Kleikamp } 1515ac27a0ecSDave Kleikamp if (!value) { 1516ac27a0ecSDave Kleikamp if (!is.s.not_found) 1517e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1518ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 1519617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1520ac27a0ecSDave Kleikamp } else { 15213fd16462SJan Kara error = 0; 15223fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 15233fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 15243fd16462SJan Kara goto cleanup; 15253fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 15263fd16462SJan Kara goto cleanup; 15273fd16462SJan Kara 1528b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 1529b347e2bcSTahsin Erdogan (EXT4_XATTR_SIZE(i.value_len) > 1530b347e2bcSTahsin Erdogan EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) 1531b347e2bcSTahsin Erdogan i.in_inode = 1; 1532b347e2bcSTahsin Erdogan retry_inode: 1533e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1534ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 1535ac27a0ecSDave Kleikamp i.value = NULL; 1536617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1537ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 15387e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 15397e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 15407e01c8e5STiger Yang if (error) 15417e01c8e5STiger Yang goto cleanup; 15427e01c8e5STiger Yang } 1543617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1544b347e2bcSTahsin Erdogan if (!error && !is.s.not_found) { 1545ac27a0ecSDave Kleikamp i.value = NULL; 1546e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, 1547e50e5129SAndreas Dilger &is); 1548b347e2bcSTahsin Erdogan } else if (error == -ENOSPC) { 1549b347e2bcSTahsin Erdogan /* 1550b347e2bcSTahsin Erdogan * Xattr does not fit in the block, store at 1551b347e2bcSTahsin Erdogan * external inode if possible. 1552b347e2bcSTahsin Erdogan */ 1553b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 1554b347e2bcSTahsin Erdogan !i.in_inode) { 1555b347e2bcSTahsin Erdogan i.in_inode = 1; 1556b347e2bcSTahsin Erdogan goto retry_inode; 1557b347e2bcSTahsin Erdogan } 1558ac27a0ecSDave Kleikamp } 1559ac27a0ecSDave Kleikamp } 1560ac27a0ecSDave Kleikamp } 1561ac27a0ecSDave Kleikamp if (!error) { 1562617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 1563eeca7ea1SDeepa Dinamani inode->i_ctime = current_time(inode); 15646dd4ee7cSKalpak Shah if (!value) 1565c755e251STheodore Ts'o no_expand = 0; 1566617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 1567ac27a0ecSDave Kleikamp /* 1568617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 1569ac27a0ecSDave Kleikamp * error != 0. 1570ac27a0ecSDave Kleikamp */ 1571ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 1572ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 15730390131bSFrank Mayhar ext4_handle_sync(handle); 1574ac27a0ecSDave Kleikamp } 1575ac27a0ecSDave Kleikamp 1576ac27a0ecSDave Kleikamp cleanup: 1577ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 1578ac27a0ecSDave Kleikamp brelse(bs.bh); 1579c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 1580ac27a0ecSDave Kleikamp return error; 1581ac27a0ecSDave Kleikamp } 1582ac27a0ecSDave Kleikamp 1583c1a5d5f6STahsin Erdogan int ext4_xattr_set_credits(struct inode *inode, size_t value_len) 1584c1a5d5f6STahsin Erdogan { 1585c1a5d5f6STahsin Erdogan struct super_block *sb = inode->i_sb; 1586c1a5d5f6STahsin Erdogan int credits; 1587c1a5d5f6STahsin Erdogan 1588c1a5d5f6STahsin Erdogan if (!EXT4_SB(sb)->s_journal) 1589c1a5d5f6STahsin Erdogan return 0; 1590c1a5d5f6STahsin Erdogan 1591c1a5d5f6STahsin Erdogan credits = EXT4_DATA_TRANS_BLOCKS(inode->i_sb); 1592c1a5d5f6STahsin Erdogan 1593c1a5d5f6STahsin Erdogan /* 1594c1a5d5f6STahsin Erdogan * In case of inline data, we may push out the data to a block, 1595c1a5d5f6STahsin Erdogan * so we need to reserve credits for this eventuality 1596c1a5d5f6STahsin Erdogan */ 1597c1a5d5f6STahsin Erdogan if (ext4_has_inline_data(inode)) 1598c1a5d5f6STahsin Erdogan credits += ext4_writepage_trans_blocks(inode) + 1; 1599c1a5d5f6STahsin Erdogan 1600c1a5d5f6STahsin Erdogan if (ext4_has_feature_ea_inode(sb)) { 1601c1a5d5f6STahsin Erdogan int nrblocks = (value_len + sb->s_blocksize - 1) >> 1602c1a5d5f6STahsin Erdogan sb->s_blocksize_bits; 1603c1a5d5f6STahsin Erdogan 1604c1a5d5f6STahsin Erdogan /* For new inode */ 1605c1a5d5f6STahsin Erdogan credits += EXT4_SINGLEDATA_TRANS_BLOCKS(sb) + 3; 1606c1a5d5f6STahsin Erdogan 1607c1a5d5f6STahsin Erdogan /* For data blocks of EA inode */ 1608c1a5d5f6STahsin Erdogan credits += ext4_meta_trans_blocks(inode, nrblocks, 0); 1609c1a5d5f6STahsin Erdogan } 1610c1a5d5f6STahsin Erdogan return credits; 1611c1a5d5f6STahsin Erdogan } 1612c1a5d5f6STahsin Erdogan 1613ac27a0ecSDave Kleikamp /* 1614617ba13bSMingming Cao * ext4_xattr_set() 1615ac27a0ecSDave Kleikamp * 1616617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 1617ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 1618ac27a0ecSDave Kleikamp * 1619ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1620ac27a0ecSDave Kleikamp */ 1621ac27a0ecSDave Kleikamp int 1622617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 1623ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 1624ac27a0ecSDave Kleikamp { 1625ac27a0ecSDave Kleikamp handle_t *handle; 1626e50e5129SAndreas Dilger struct super_block *sb = inode->i_sb; 1627ac27a0ecSDave Kleikamp int error, retries = 0; 1628c1a5d5f6STahsin Erdogan int credits; 1629ac27a0ecSDave Kleikamp 1630b8cb5a54STahsin Erdogan error = dquot_initialize(inode); 1631b8cb5a54STahsin Erdogan if (error) 1632b8cb5a54STahsin Erdogan return error; 1633e50e5129SAndreas Dilger 1634ac27a0ecSDave Kleikamp retry: 1635c1a5d5f6STahsin Erdogan credits = ext4_xattr_set_credits(inode, value_len); 16369924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 1637ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 1638ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 1639ac27a0ecSDave Kleikamp } else { 1640ac27a0ecSDave Kleikamp int error2; 1641ac27a0ecSDave Kleikamp 1642617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 1643ac27a0ecSDave Kleikamp value, value_len, flags); 1644617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 1645ac27a0ecSDave Kleikamp if (error == -ENOSPC && 1646e50e5129SAndreas Dilger ext4_should_retry_alloc(sb, &retries)) 1647ac27a0ecSDave Kleikamp goto retry; 1648ac27a0ecSDave Kleikamp if (error == 0) 1649ac27a0ecSDave Kleikamp error = error2; 1650ac27a0ecSDave Kleikamp } 1651ac27a0ecSDave Kleikamp 1652ac27a0ecSDave Kleikamp return error; 1653ac27a0ecSDave Kleikamp } 1654ac27a0ecSDave Kleikamp 1655ac27a0ecSDave Kleikamp /* 16566dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 16576dd4ee7cSKalpak Shah * i_extra_isize. 16586dd4ee7cSKalpak Shah */ 16596dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 16606dd4ee7cSKalpak Shah int value_offs_shift, void *to, 166194405713SJan Kara void *from, size_t n) 16626dd4ee7cSKalpak Shah { 16636dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 16646dd4ee7cSKalpak Shah int new_offs; 16656dd4ee7cSKalpak Shah 166694405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 166794405713SJan Kara BUG_ON(value_offs_shift > 0); 166894405713SJan Kara 16696dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 16706dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1671e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 16726dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 16736dd4ee7cSKalpak Shah value_offs_shift; 16746dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 16756dd4ee7cSKalpak Shah } 16766dd4ee7cSKalpak Shah } 16776dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 16786dd4ee7cSKalpak Shah memmove(to, from, n); 16796dd4ee7cSKalpak Shah } 16806dd4ee7cSKalpak Shah 16816dd4ee7cSKalpak Shah /* 16823f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 16833f2571c1SJan Kara */ 16843f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 16853f2571c1SJan Kara struct ext4_inode *raw_inode, 16863f2571c1SJan Kara struct ext4_xattr_entry *entry) 16873f2571c1SJan Kara { 16883f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 16893f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 16903f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 1691f6109100STahsin Erdogan size_t value_size = le32_to_cpu(entry->e_value_size); 16923f2571c1SJan Kara struct ext4_xattr_info i = { 16933f2571c1SJan Kara .value = NULL, 16943f2571c1SJan Kara .value_len = 0, 16953f2571c1SJan Kara .name_index = entry->e_name_index, 1696f6109100STahsin Erdogan .in_inode = !!entry->e_value_inum, 16973f2571c1SJan Kara }; 16983f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 16993f2571c1SJan Kara int error; 17003f2571c1SJan Kara 17013f2571c1SJan Kara is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 17023f2571c1SJan Kara bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 17033f2571c1SJan Kara buffer = kmalloc(value_size, GFP_NOFS); 17043f2571c1SJan Kara b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 17053f2571c1SJan Kara if (!is || !bs || !buffer || !b_entry_name) { 17063f2571c1SJan Kara error = -ENOMEM; 17073f2571c1SJan Kara goto out; 17083f2571c1SJan Kara } 17093f2571c1SJan Kara 17103f2571c1SJan Kara is->s.not_found = -ENODATA; 17113f2571c1SJan Kara bs->s.not_found = -ENODATA; 17123f2571c1SJan Kara is->iloc.bh = NULL; 17133f2571c1SJan Kara bs->bh = NULL; 17143f2571c1SJan Kara 17153f2571c1SJan Kara /* Save the entry name and the entry value */ 1716f6109100STahsin Erdogan if (entry->e_value_inum) { 1717f6109100STahsin Erdogan error = ext4_xattr_inode_get(inode, 1718f6109100STahsin Erdogan le32_to_cpu(entry->e_value_inum), 1719f6109100STahsin Erdogan buffer, value_size); 1720f6109100STahsin Erdogan if (error) 1721f6109100STahsin Erdogan goto out; 1722f6109100STahsin Erdogan } else { 1723f6109100STahsin Erdogan size_t value_offs = le16_to_cpu(entry->e_value_offs); 17243f2571c1SJan Kara memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); 1725f6109100STahsin Erdogan } 1726f6109100STahsin Erdogan 17273f2571c1SJan Kara memcpy(b_entry_name, entry->e_name, entry->e_name_len); 17283f2571c1SJan Kara b_entry_name[entry->e_name_len] = '\0'; 17293f2571c1SJan Kara i.name = b_entry_name; 17303f2571c1SJan Kara 17313f2571c1SJan Kara error = ext4_get_inode_loc(inode, &is->iloc); 17323f2571c1SJan Kara if (error) 17333f2571c1SJan Kara goto out; 17343f2571c1SJan Kara 17353f2571c1SJan Kara error = ext4_xattr_ibody_find(inode, &i, is); 17363f2571c1SJan Kara if (error) 17373f2571c1SJan Kara goto out; 17383f2571c1SJan Kara 17393f2571c1SJan Kara /* Remove the chosen entry from the inode */ 1740e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, is); 17413f2571c1SJan Kara if (error) 17423f2571c1SJan Kara goto out; 17433f2571c1SJan Kara 17443f2571c1SJan Kara i.value = buffer; 17453f2571c1SJan Kara i.value_len = value_size; 17463f2571c1SJan Kara error = ext4_xattr_block_find(inode, &i, bs); 17473f2571c1SJan Kara if (error) 17483f2571c1SJan Kara goto out; 17493f2571c1SJan Kara 17503f2571c1SJan Kara /* Add entry which was removed from the inode into the block */ 17513f2571c1SJan Kara error = ext4_xattr_block_set(handle, inode, &i, bs); 17523f2571c1SJan Kara if (error) 17533f2571c1SJan Kara goto out; 17543f2571c1SJan Kara error = 0; 17553f2571c1SJan Kara out: 17563f2571c1SJan Kara kfree(b_entry_name); 17573f2571c1SJan Kara kfree(buffer); 17583f2571c1SJan Kara if (is) 17593f2571c1SJan Kara brelse(is->iloc.bh); 17603f2571c1SJan Kara kfree(is); 17613f2571c1SJan Kara kfree(bs); 17623f2571c1SJan Kara 17633f2571c1SJan Kara return error; 17643f2571c1SJan Kara } 17653f2571c1SJan Kara 1766dfa2064bSJan Kara static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, 1767dfa2064bSJan Kara struct ext4_inode *raw_inode, 1768dfa2064bSJan Kara int isize_diff, size_t ifree, 1769dfa2064bSJan Kara size_t bfree, int *total_ino) 1770dfa2064bSJan Kara { 1771dfa2064bSJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 1772dfa2064bSJan Kara struct ext4_xattr_entry *small_entry; 1773dfa2064bSJan Kara struct ext4_xattr_entry *entry; 1774dfa2064bSJan Kara struct ext4_xattr_entry *last; 1775dfa2064bSJan Kara unsigned int entry_size; /* EA entry size */ 1776dfa2064bSJan Kara unsigned int total_size; /* EA entry size + value size */ 1777dfa2064bSJan Kara unsigned int min_total_size; 1778dfa2064bSJan Kara int error; 1779dfa2064bSJan Kara 1780dfa2064bSJan Kara while (isize_diff > ifree) { 1781dfa2064bSJan Kara entry = NULL; 1782dfa2064bSJan Kara small_entry = NULL; 1783dfa2064bSJan Kara min_total_size = ~0U; 1784dfa2064bSJan Kara last = IFIRST(header); 1785dfa2064bSJan Kara /* Find the entry best suited to be pushed into EA block */ 1786dfa2064bSJan Kara for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 17879bb21cedSTahsin Erdogan total_size = EXT4_XATTR_LEN(last->e_name_len); 17889bb21cedSTahsin Erdogan if (!last->e_value_inum) 17899bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 17909bb21cedSTahsin Erdogan le32_to_cpu(last->e_value_size)); 1791dfa2064bSJan Kara if (total_size <= bfree && 1792dfa2064bSJan Kara total_size < min_total_size) { 1793dfa2064bSJan Kara if (total_size + ifree < isize_diff) { 1794dfa2064bSJan Kara small_entry = last; 1795dfa2064bSJan Kara } else { 1796dfa2064bSJan Kara entry = last; 1797dfa2064bSJan Kara min_total_size = total_size; 1798dfa2064bSJan Kara } 1799dfa2064bSJan Kara } 1800dfa2064bSJan Kara } 1801dfa2064bSJan Kara 1802dfa2064bSJan Kara if (entry == NULL) { 1803dfa2064bSJan Kara if (small_entry == NULL) 1804dfa2064bSJan Kara return -ENOSPC; 1805dfa2064bSJan Kara entry = small_entry; 1806dfa2064bSJan Kara } 1807dfa2064bSJan Kara 1808dfa2064bSJan Kara entry_size = EXT4_XATTR_LEN(entry->e_name_len); 18099bb21cedSTahsin Erdogan total_size = entry_size; 18109bb21cedSTahsin Erdogan if (!entry->e_value_inum) 18119bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 18129bb21cedSTahsin Erdogan le32_to_cpu(entry->e_value_size)); 1813dfa2064bSJan Kara error = ext4_xattr_move_to_block(handle, inode, raw_inode, 1814dfa2064bSJan Kara entry); 1815dfa2064bSJan Kara if (error) 1816dfa2064bSJan Kara return error; 1817dfa2064bSJan Kara 1818dfa2064bSJan Kara *total_ino -= entry_size; 1819dfa2064bSJan Kara ifree += total_size; 1820dfa2064bSJan Kara bfree -= total_size; 1821dfa2064bSJan Kara } 1822dfa2064bSJan Kara 1823dfa2064bSJan Kara return 0; 1824dfa2064bSJan Kara } 1825dfa2064bSJan Kara 18263f2571c1SJan Kara /* 18276dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 18286dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 18296dd4ee7cSKalpak Shah */ 18306dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 18316dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 18326dd4ee7cSKalpak Shah { 18336dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 18346dd4ee7cSKalpak Shah struct buffer_head *bh = NULL; 1835e3014d14SJan Kara size_t min_offs; 1836e3014d14SJan Kara size_t ifree, bfree; 18377b1b2c1bSTheodore Ts'o int total_ino; 18386e0cd088SJan Kara void *base, *end; 1839d0141191SJan Kara int error = 0, tried_min_extra_isize = 0; 1840ac39849dSAneesh Kumar K.V int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); 1841d0141191SJan Kara int isize_diff; /* How much do we need to grow i_extra_isize */ 1842c755e251STheodore Ts'o int no_expand; 18436dd4ee7cSKalpak Shah 1844c755e251STheodore Ts'o if (ext4_write_trylock_xattr(inode, &no_expand) == 0) 1845c755e251STheodore Ts'o return 0; 1846c755e251STheodore Ts'o 18476dd4ee7cSKalpak Shah retry: 1848d0141191SJan Kara isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; 18492e81a4eeSJan Kara if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) 18502e81a4eeSJan Kara goto out; 18516dd4ee7cSKalpak Shah 18526dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 18536dd4ee7cSKalpak Shah 18546dd4ee7cSKalpak Shah /* 18556dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 18566dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 18576dd4ee7cSKalpak Shah */ 18586dd4ee7cSKalpak Shah 18596e0cd088SJan Kara base = IFIRST(header); 18606dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 18616dd4ee7cSKalpak Shah min_offs = end - base; 18626dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 18636dd4ee7cSKalpak Shah 18649e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 18659e92f48cSTheodore Ts'o if (error) 18669e92f48cSTheodore Ts'o goto cleanup; 18679e92f48cSTheodore Ts'o 18686e0cd088SJan Kara ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); 1869e3014d14SJan Kara if (ifree >= isize_diff) 1870e3014d14SJan Kara goto shift; 18716dd4ee7cSKalpak Shah 18726dd4ee7cSKalpak Shah /* 18736dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 18746dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 18756dd4ee7cSKalpak Shah */ 18766dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 18776dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 18786dd4ee7cSKalpak Shah error = -EIO; 18796dd4ee7cSKalpak Shah if (!bh) 18806dd4ee7cSKalpak Shah goto cleanup; 1881cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 188224676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 188324676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 18846a797d27SDarrick J. Wong error = -EFSCORRUPTED; 18856dd4ee7cSKalpak Shah goto cleanup; 18866dd4ee7cSKalpak Shah } 18876dd4ee7cSKalpak Shah base = BHDR(bh); 18886dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 18896dd4ee7cSKalpak Shah min_offs = end - base; 18906e0cd088SJan Kara bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, 18916e0cd088SJan Kara NULL); 1892e3014d14SJan Kara if (bfree + ifree < isize_diff) { 18936dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 18946dd4ee7cSKalpak Shah tried_min_extra_isize++; 18956dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 18966dd4ee7cSKalpak Shah brelse(bh); 18976dd4ee7cSKalpak Shah goto retry; 18986dd4ee7cSKalpak Shah } 1899dfa2064bSJan Kara error = -ENOSPC; 19006dd4ee7cSKalpak Shah goto cleanup; 19016dd4ee7cSKalpak Shah } 19026dd4ee7cSKalpak Shah } else { 1903e3014d14SJan Kara bfree = inode->i_sb->s_blocksize; 19046dd4ee7cSKalpak Shah } 19056dd4ee7cSKalpak Shah 1906dfa2064bSJan Kara error = ext4_xattr_make_inode_space(handle, inode, raw_inode, 1907dfa2064bSJan Kara isize_diff, ifree, bfree, 1908dfa2064bSJan Kara &total_ino); 1909dfa2064bSJan Kara if (error) { 1910dfa2064bSJan Kara if (error == -ENOSPC && !tried_min_extra_isize && 19116dd4ee7cSKalpak Shah s_min_extra_isize) { 19126dd4ee7cSKalpak Shah tried_min_extra_isize++; 19136dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 1914dcb9917bSTheodore Ts'o brelse(bh); 19156dd4ee7cSKalpak Shah goto retry; 19166dd4ee7cSKalpak Shah } 19176dd4ee7cSKalpak Shah goto cleanup; 19186dd4ee7cSKalpak Shah } 1919e3014d14SJan Kara shift: 1920e3014d14SJan Kara /* Adjust the offsets and shift the remaining entries ahead */ 19216e0cd088SJan Kara ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize 1922e3014d14SJan Kara - new_extra_isize, (void *)raw_inode + 1923e3014d14SJan Kara EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 192494405713SJan Kara (void *)header, total_ino); 1925e3014d14SJan Kara EXT4_I(inode)->i_extra_isize = new_extra_isize; 19266dd4ee7cSKalpak Shah brelse(bh); 19272e81a4eeSJan Kara out: 1928c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 19296dd4ee7cSKalpak Shah return 0; 19306dd4ee7cSKalpak Shah 19316dd4ee7cSKalpak Shah cleanup: 19326dd4ee7cSKalpak Shah brelse(bh); 19332e81a4eeSJan Kara /* 1934c755e251STheodore Ts'o * Inode size expansion failed; don't try again 19352e81a4eeSJan Kara */ 1936c755e251STheodore Ts'o no_expand = 1; 1937c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 19386dd4ee7cSKalpak Shah return error; 19396dd4ee7cSKalpak Shah } 19406dd4ee7cSKalpak Shah 19416dd4ee7cSKalpak Shah 1942e50e5129SAndreas Dilger #define EIA_INCR 16 /* must be 2^n */ 1943e50e5129SAndreas Dilger #define EIA_MASK (EIA_INCR - 1) 19440421a189STahsin Erdogan /* Add the large xattr @inode into @ea_inode_array for later deletion. 19450421a189STahsin Erdogan * If @ea_inode_array is new or full it will be grown and the old 1946e50e5129SAndreas Dilger * contents copied over. 1947e50e5129SAndreas Dilger */ 1948e50e5129SAndreas Dilger static int 19490421a189STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 19500421a189STahsin Erdogan struct inode *inode) 1951e50e5129SAndreas Dilger { 19520421a189STahsin Erdogan if (*ea_inode_array == NULL) { 1953e50e5129SAndreas Dilger /* 1954e50e5129SAndreas Dilger * Start with 15 inodes, so it fits into a power-of-two size. 19550421a189STahsin Erdogan * If *ea_inode_array is NULL, this is essentially offsetof() 1956e50e5129SAndreas Dilger */ 19570421a189STahsin Erdogan (*ea_inode_array) = 19580421a189STahsin Erdogan kmalloc(offsetof(struct ext4_xattr_inode_array, 19590421a189STahsin Erdogan inodes[EIA_MASK]), 1960e50e5129SAndreas Dilger GFP_NOFS); 19610421a189STahsin Erdogan if (*ea_inode_array == NULL) 1962e50e5129SAndreas Dilger return -ENOMEM; 19630421a189STahsin Erdogan (*ea_inode_array)->count = 0; 19640421a189STahsin Erdogan } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { 1965e50e5129SAndreas Dilger /* expand the array once all 15 + n * 16 slots are full */ 19660421a189STahsin Erdogan struct ext4_xattr_inode_array *new_array = NULL; 19670421a189STahsin Erdogan int count = (*ea_inode_array)->count; 1968e50e5129SAndreas Dilger 1969e50e5129SAndreas Dilger /* if new_array is NULL, this is essentially offsetof() */ 1970e50e5129SAndreas Dilger new_array = kmalloc( 19710421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, 19720421a189STahsin Erdogan inodes[count + EIA_INCR]), 1973e50e5129SAndreas Dilger GFP_NOFS); 1974e50e5129SAndreas Dilger if (new_array == NULL) 1975e50e5129SAndreas Dilger return -ENOMEM; 19760421a189STahsin Erdogan memcpy(new_array, *ea_inode_array, 19770421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, inodes[count])); 19780421a189STahsin Erdogan kfree(*ea_inode_array); 19790421a189STahsin Erdogan *ea_inode_array = new_array; 1980e50e5129SAndreas Dilger } 19810421a189STahsin Erdogan (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; 1982e50e5129SAndreas Dilger return 0; 1983e50e5129SAndreas Dilger } 1984e50e5129SAndreas Dilger 1985e50e5129SAndreas Dilger /** 1986e50e5129SAndreas Dilger * Add xattr inode to orphan list 1987e50e5129SAndreas Dilger */ 1988e50e5129SAndreas Dilger static int 19890421a189STahsin Erdogan ext4_xattr_inode_orphan_add(handle_t *handle, struct inode *inode, int credits, 19900421a189STahsin Erdogan struct ext4_xattr_inode_array *ea_inode_array) 1991e50e5129SAndreas Dilger { 1992e50e5129SAndreas Dilger int idx = 0, error = 0; 19930421a189STahsin Erdogan struct inode *ea_inode; 1994e50e5129SAndreas Dilger 19950421a189STahsin Erdogan if (ea_inode_array == NULL) 1996e50e5129SAndreas Dilger return 0; 1997e50e5129SAndreas Dilger 19980421a189STahsin Erdogan for (; idx < ea_inode_array->count; ++idx) { 1999e50e5129SAndreas Dilger if (!ext4_handle_has_enough_credits(handle, credits)) { 2000e50e5129SAndreas Dilger error = ext4_journal_extend(handle, credits); 2001e50e5129SAndreas Dilger if (error > 0) 2002e50e5129SAndreas Dilger error = ext4_journal_restart(handle, credits); 2003e50e5129SAndreas Dilger 2004e50e5129SAndreas Dilger if (error != 0) { 2005e50e5129SAndreas Dilger ext4_warning(inode->i_sb, 2006e50e5129SAndreas Dilger "couldn't extend journal " 2007e50e5129SAndreas Dilger "(err %d)", error); 2008e50e5129SAndreas Dilger return error; 2009e50e5129SAndreas Dilger } 2010e50e5129SAndreas Dilger } 20110421a189STahsin Erdogan ea_inode = ea_inode_array->inodes[idx]; 20120de5983dSTahsin Erdogan inode_lock(ea_inode); 2013e50e5129SAndreas Dilger ext4_orphan_add(handle, ea_inode); 20140de5983dSTahsin Erdogan inode_unlock(ea_inode); 2015e50e5129SAndreas Dilger /* the inode's i_count will be released by caller */ 2016e50e5129SAndreas Dilger } 2017e50e5129SAndreas Dilger 2018e50e5129SAndreas Dilger return 0; 2019e50e5129SAndreas Dilger } 20206dd4ee7cSKalpak Shah 20216dd4ee7cSKalpak Shah /* 2022617ba13bSMingming Cao * ext4_xattr_delete_inode() 2023ac27a0ecSDave Kleikamp * 2024e50e5129SAndreas Dilger * Free extended attribute resources associated with this inode. Traverse 2025e50e5129SAndreas Dilger * all entries and unlink any xattr inodes associated with this inode. This 2026ac27a0ecSDave Kleikamp * is called immediately before an inode is freed. We have exclusive 2027e50e5129SAndreas Dilger * access to the inode. If an orphan inode is deleted it will also delete any 2028e50e5129SAndreas Dilger * xattr block and all xattr inodes. They are checked by ext4_xattr_inode_iget() 2029e50e5129SAndreas Dilger * to ensure they belong to the parent inode and were not deleted already. 2030ac27a0ecSDave Kleikamp */ 2031e50e5129SAndreas Dilger int 2032e50e5129SAndreas Dilger ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, 20330421a189STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array) 2034ac27a0ecSDave Kleikamp { 2035ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 2036e50e5129SAndreas Dilger struct ext4_xattr_ibody_header *header; 2037e50e5129SAndreas Dilger struct ext4_inode *raw_inode; 2038e50e5129SAndreas Dilger struct ext4_iloc iloc; 2039e50e5129SAndreas Dilger struct ext4_xattr_entry *entry; 20400421a189STahsin Erdogan struct inode *ea_inode; 2041990461ddSTahsin Erdogan unsigned int ea_ino; 2042e50e5129SAndreas Dilger int credits = 3, error = 0; 2043ac27a0ecSDave Kleikamp 2044e50e5129SAndreas Dilger if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 2045e50e5129SAndreas Dilger goto delete_external_ea; 2046e50e5129SAndreas Dilger 2047e50e5129SAndreas Dilger error = ext4_get_inode_loc(inode, &iloc); 2048e50e5129SAndreas Dilger if (error) 2049ac27a0ecSDave Kleikamp goto cleanup; 2050e50e5129SAndreas Dilger raw_inode = ext4_raw_inode(&iloc); 2051e50e5129SAndreas Dilger header = IHDR(inode, raw_inode); 2052e50e5129SAndreas Dilger for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); 2053e50e5129SAndreas Dilger entry = EXT4_XATTR_NEXT(entry)) { 2054e50e5129SAndreas Dilger if (!entry->e_value_inum) 2055e50e5129SAndreas Dilger continue; 2056990461ddSTahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 20570421a189STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, &ea_inode); 20580421a189STahsin Erdogan if (error) 20590421a189STahsin Erdogan continue; 20600421a189STahsin Erdogan error = ext4_expand_inode_array(ea_inode_array, ea_inode); 206165d30005STahsin Erdogan if (error) { 20620421a189STahsin Erdogan iput(ea_inode); 2063e50e5129SAndreas Dilger brelse(iloc.bh); 2064e50e5129SAndreas Dilger goto cleanup; 2065e50e5129SAndreas Dilger } 2066e50e5129SAndreas Dilger entry->e_value_inum = 0; 2067e50e5129SAndreas Dilger } 2068e50e5129SAndreas Dilger brelse(iloc.bh); 2069e50e5129SAndreas Dilger 2070e50e5129SAndreas Dilger delete_external_ea: 2071e50e5129SAndreas Dilger if (!EXT4_I(inode)->i_file_acl) { 2072e50e5129SAndreas Dilger /* add xattr inode to orphan list */ 207365d30005STahsin Erdogan error = ext4_xattr_inode_orphan_add(handle, inode, credits, 20740421a189STahsin Erdogan *ea_inode_array); 2075e50e5129SAndreas Dilger goto cleanup; 2076e50e5129SAndreas Dilger } 2077617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 2078ac27a0ecSDave Kleikamp if (!bh) { 207924676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 208024676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 208165d30005STahsin Erdogan error = -EIO; 2082ac27a0ecSDave Kleikamp goto cleanup; 2083ac27a0ecSDave Kleikamp } 2084617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 2085ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) { 208624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 208724676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 208865d30005STahsin Erdogan error = -EFSCORRUPTED; 2089ac27a0ecSDave Kleikamp goto cleanup; 2090ac27a0ecSDave Kleikamp } 2091e50e5129SAndreas Dilger 2092e50e5129SAndreas Dilger for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 2093e50e5129SAndreas Dilger entry = EXT4_XATTR_NEXT(entry)) { 2094e50e5129SAndreas Dilger if (!entry->e_value_inum) 2095e50e5129SAndreas Dilger continue; 2096990461ddSTahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 20970421a189STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, &ea_inode); 20980421a189STahsin Erdogan if (error) 20990421a189STahsin Erdogan continue; 21000421a189STahsin Erdogan error = ext4_expand_inode_array(ea_inode_array, ea_inode); 210165d30005STahsin Erdogan if (error) 2102e50e5129SAndreas Dilger goto cleanup; 2103e50e5129SAndreas Dilger entry->e_value_inum = 0; 2104e50e5129SAndreas Dilger } 2105e50e5129SAndreas Dilger 2106e50e5129SAndreas Dilger /* add xattr inode to orphan list */ 2107e50e5129SAndreas Dilger error = ext4_xattr_inode_orphan_add(handle, inode, credits, 21080421a189STahsin Erdogan *ea_inode_array); 210965d30005STahsin Erdogan if (error) 2110e50e5129SAndreas Dilger goto cleanup; 2111e50e5129SAndreas Dilger 2112e50e5129SAndreas Dilger if (!IS_NOQUOTA(inode)) 2113e50e5129SAndreas Dilger credits += 2 * EXT4_QUOTA_DEL_BLOCKS(inode->i_sb); 2114e50e5129SAndreas Dilger 2115e50e5129SAndreas Dilger if (!ext4_handle_has_enough_credits(handle, credits)) { 2116e50e5129SAndreas Dilger error = ext4_journal_extend(handle, credits); 2117e50e5129SAndreas Dilger if (error > 0) 2118e50e5129SAndreas Dilger error = ext4_journal_restart(handle, credits); 211965d30005STahsin Erdogan if (error) { 2120e50e5129SAndreas Dilger ext4_warning(inode->i_sb, 2121e50e5129SAndreas Dilger "couldn't extend journal (err %d)", error); 2122e50e5129SAndreas Dilger goto cleanup; 2123e50e5129SAndreas Dilger } 2124e50e5129SAndreas Dilger } 2125e50e5129SAndreas Dilger 2126617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bh); 2127617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 2128ac27a0ecSDave Kleikamp 2129ac27a0ecSDave Kleikamp cleanup: 2130ac27a0ecSDave Kleikamp brelse(bh); 2131e50e5129SAndreas Dilger 2132e50e5129SAndreas Dilger return error; 2133e50e5129SAndreas Dilger } 2134e50e5129SAndreas Dilger 21350421a189STahsin Erdogan void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) 2136e50e5129SAndreas Dilger { 2137bab79b04STahsin Erdogan struct inode *ea_inode; 2138e50e5129SAndreas Dilger int idx = 0; 2139e50e5129SAndreas Dilger 21400421a189STahsin Erdogan if (ea_inode_array == NULL) 2141e50e5129SAndreas Dilger return; 2142e50e5129SAndreas Dilger 21430421a189STahsin Erdogan for (; idx < ea_inode_array->count; ++idx) { 21440421a189STahsin Erdogan ea_inode = ea_inode_array->inodes[idx]; 2145e50e5129SAndreas Dilger clear_nlink(ea_inode); 2146e50e5129SAndreas Dilger iput(ea_inode); 2147e50e5129SAndreas Dilger } 21480421a189STahsin Erdogan kfree(ea_inode_array); 2149ac27a0ecSDave Kleikamp } 2150ac27a0ecSDave Kleikamp 2151ac27a0ecSDave Kleikamp /* 2152*47387409STahsin Erdogan * ext4_xattr_block_cache_insert() 2153ac27a0ecSDave Kleikamp * 2154*47387409STahsin Erdogan * Create a new entry in the extended attribute block cache, and insert 2155ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 2156ac27a0ecSDave Kleikamp * 2157ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2158ac27a0ecSDave Kleikamp */ 2159ac27a0ecSDave Kleikamp static void 2160*47387409STahsin Erdogan ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, 2161*47387409STahsin Erdogan struct buffer_head *bh) 2162ac27a0ecSDave Kleikamp { 21636048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 21646048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 21656048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 21666048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 2167ac27a0ecSDave Kleikamp int error; 2168ac27a0ecSDave Kleikamp 2169*47387409STahsin Erdogan error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, 21706048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 2171ac27a0ecSDave Kleikamp if (error) { 217282939d79SJan Kara if (error == -EBUSY) 2173ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 217482939d79SJan Kara } else 2175ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 2176ac27a0ecSDave Kleikamp } 2177ac27a0ecSDave Kleikamp 2178ac27a0ecSDave Kleikamp /* 2179617ba13bSMingming Cao * ext4_xattr_cmp() 2180ac27a0ecSDave Kleikamp * 2181ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 2182ac27a0ecSDave Kleikamp * 2183ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 2184ac27a0ecSDave Kleikamp * a negative error number on errors. 2185ac27a0ecSDave Kleikamp */ 2186ac27a0ecSDave Kleikamp static int 2187617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 2188617ba13bSMingming Cao struct ext4_xattr_header *header2) 2189ac27a0ecSDave Kleikamp { 2190617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 2191ac27a0ecSDave Kleikamp 2192ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 2193ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 2194ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 2195ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 2196ac27a0ecSDave Kleikamp return 1; 2197ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 2198ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 2199ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 2200ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 2201e50e5129SAndreas Dilger entry1->e_value_inum != entry2->e_value_inum || 2202ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 2203ac27a0ecSDave Kleikamp return 1; 22047cec1918STahsin Erdogan if (!entry1->e_value_inum && 22057cec1918STahsin Erdogan memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 2206ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 2207ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 2208ac27a0ecSDave Kleikamp return 1; 2209ac27a0ecSDave Kleikamp 2210617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 2211617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 2212ac27a0ecSDave Kleikamp } 2213ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 2214ac27a0ecSDave Kleikamp return 1; 2215ac27a0ecSDave Kleikamp return 0; 2216ac27a0ecSDave Kleikamp } 2217ac27a0ecSDave Kleikamp 2218ac27a0ecSDave Kleikamp /* 2219*47387409STahsin Erdogan * ext4_xattr_block_cache_find() 2220ac27a0ecSDave Kleikamp * 2221ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 2222ac27a0ecSDave Kleikamp * 2223ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 2224ac27a0ecSDave Kleikamp * not found or an error occurred. 2225ac27a0ecSDave Kleikamp */ 2226ac27a0ecSDave Kleikamp static struct buffer_head * 2227*47387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *inode, 2228*47387409STahsin Erdogan struct ext4_xattr_header *header, 22297a2508e1SJan Kara struct mb_cache_entry **pce) 2230ac27a0ecSDave Kleikamp { 2231ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 22327a2508e1SJan Kara struct mb_cache_entry *ce; 2233*47387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 2234ac27a0ecSDave Kleikamp 2235ac27a0ecSDave Kleikamp if (!header->h_hash) 2236ac27a0ecSDave Kleikamp return NULL; /* never share */ 2237ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 2238*47387409STahsin Erdogan ce = mb_cache_entry_find_first(ea_block_cache, hash); 2239ac27a0ecSDave Kleikamp while (ce) { 2240ac27a0ecSDave Kleikamp struct buffer_head *bh; 2241ac27a0ecSDave Kleikamp 2242c07dfcb4STahsin Erdogan bh = sb_bread(inode->i_sb, ce->e_value); 2243ac27a0ecSDave Kleikamp if (!bh) { 224424676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 2245c07dfcb4STahsin Erdogan (unsigned long)ce->e_value); 2246617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 2247ac27a0ecSDave Kleikamp *pce = ce; 2248ac27a0ecSDave Kleikamp return bh; 2249ac27a0ecSDave Kleikamp } 2250ac27a0ecSDave Kleikamp brelse(bh); 2251*47387409STahsin Erdogan ce = mb_cache_entry_find_next(ea_block_cache, ce); 2252ac27a0ecSDave Kleikamp } 2253ac27a0ecSDave Kleikamp return NULL; 2254ac27a0ecSDave Kleikamp } 2255ac27a0ecSDave Kleikamp 2256ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 2257ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 2258ac27a0ecSDave Kleikamp 2259ac27a0ecSDave Kleikamp /* 2260617ba13bSMingming Cao * ext4_xattr_hash_entry() 2261ac27a0ecSDave Kleikamp * 2262ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 2263ac27a0ecSDave Kleikamp */ 2264617ba13bSMingming Cao static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, 2265617ba13bSMingming Cao struct ext4_xattr_entry *entry) 2266ac27a0ecSDave Kleikamp { 2267ac27a0ecSDave Kleikamp __u32 hash = 0; 2268ac27a0ecSDave Kleikamp char *name = entry->e_name; 2269ac27a0ecSDave Kleikamp int n; 2270ac27a0ecSDave Kleikamp 2271ac27a0ecSDave Kleikamp for (n = 0; n < entry->e_name_len; n++) { 2272ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 2273ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 2274ac27a0ecSDave Kleikamp *name++; 2275ac27a0ecSDave Kleikamp } 2276ac27a0ecSDave Kleikamp 2277e50e5129SAndreas Dilger if (!entry->e_value_inum && entry->e_value_size) { 2278ac27a0ecSDave Kleikamp __le32 *value = (__le32 *)((char *)header + 2279ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs)); 2280ac27a0ecSDave Kleikamp for (n = (le32_to_cpu(entry->e_value_size) + 2281617ba13bSMingming Cao EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { 2282ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 2283ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 2284ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 2285ac27a0ecSDave Kleikamp } 2286ac27a0ecSDave Kleikamp } 2287ac27a0ecSDave Kleikamp entry->e_hash = cpu_to_le32(hash); 2288ac27a0ecSDave Kleikamp } 2289ac27a0ecSDave Kleikamp 2290ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 2291ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 2292ac27a0ecSDave Kleikamp 2293ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 2294ac27a0ecSDave Kleikamp 2295ac27a0ecSDave Kleikamp /* 2296617ba13bSMingming Cao * ext4_xattr_rehash() 2297ac27a0ecSDave Kleikamp * 2298ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 2299ac27a0ecSDave Kleikamp */ 2300617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *header, 2301617ba13bSMingming Cao struct ext4_xattr_entry *entry) 2302ac27a0ecSDave Kleikamp { 2303617ba13bSMingming Cao struct ext4_xattr_entry *here; 2304ac27a0ecSDave Kleikamp __u32 hash = 0; 2305ac27a0ecSDave Kleikamp 2306617ba13bSMingming Cao ext4_xattr_hash_entry(header, entry); 2307ac27a0ecSDave Kleikamp here = ENTRY(header+1); 2308ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 2309ac27a0ecSDave Kleikamp if (!here->e_hash) { 2310ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 2311ac27a0ecSDave Kleikamp hash = 0; 2312ac27a0ecSDave Kleikamp break; 2313ac27a0ecSDave Kleikamp } 2314ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 2315ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 2316ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 2317617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 2318ac27a0ecSDave Kleikamp } 2319ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 2320ac27a0ecSDave Kleikamp } 2321ac27a0ecSDave Kleikamp 2322ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 2323ac27a0ecSDave Kleikamp 23249c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 23259c191f70ST Makphaibulchoke 23267a2508e1SJan Kara struct mb_cache * 232782939d79SJan Kara ext4_xattr_create_cache(void) 2328ac27a0ecSDave Kleikamp { 23297a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 2330ac27a0ecSDave Kleikamp } 2331ac27a0ecSDave Kleikamp 23327a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 2333ac27a0ecSDave Kleikamp { 23349c191f70ST Makphaibulchoke if (cache) 23357a2508e1SJan Kara mb_cache_destroy(cache); 2336ac27a0ecSDave Kleikamp } 23379c191f70ST Makphaibulchoke 2338