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 7547387409STahsin Erdogan static void ext4_xattr_block_cache_insert(struct mb_cache *, 7647387409STahsin Erdogan struct buffer_head *); 7747387409STahsin Erdogan static struct buffer_head * 7847387409STahsin 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 10847387409STahsin Erdogan #define EA_BLOCK_CACHE(inode) (((struct ext4_sb_info *) \ 10947387409STahsin Erdogan inode->i_sb->s_fs_info)->s_ea_block_cache) 1109c191f70ST Makphaibulchoke 111dec214d0STahsin Erdogan #define EA_INODE_CACHE(inode) (((struct ext4_sb_info *) \ 112dec214d0STahsin Erdogan inode->i_sb->s_fs_info)->s_ea_inode_cache) 113dec214d0STahsin Erdogan 11430a7eb97STahsin Erdogan static int 11530a7eb97STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 11630a7eb97STahsin Erdogan struct inode *inode); 11730a7eb97STahsin Erdogan 11833d201e0STahsin Erdogan #ifdef CONFIG_LOCKDEP 11933d201e0STahsin Erdogan void ext4_xattr_inode_set_class(struct inode *ea_inode) 12033d201e0STahsin Erdogan { 12133d201e0STahsin Erdogan lockdep_set_subclass(&ea_inode->i_rwsem, 1); 12233d201e0STahsin Erdogan } 12333d201e0STahsin Erdogan #endif 12433d201e0STahsin Erdogan 125cc8e94fdSDarrick J. Wong static __le32 ext4_xattr_block_csum(struct inode *inode, 126cc8e94fdSDarrick J. Wong sector_t block_nr, 127cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 128cc8e94fdSDarrick J. Wong { 129cc8e94fdSDarrick J. Wong struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 130d6a77105STheodore Ts'o __u32 csum; 131d6a77105STheodore Ts'o __le64 dsk_block_nr = cpu_to_le64(block_nr); 132b47820edSDaeho Jeong __u32 dummy_csum = 0; 133b47820edSDaeho Jeong int offset = offsetof(struct ext4_xattr_header, h_checksum); 134cc8e94fdSDarrick J. Wong 135d6a77105STheodore Ts'o csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, 136d6a77105STheodore Ts'o sizeof(dsk_block_nr)); 137b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); 138b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); 139b47820edSDaeho Jeong offset += sizeof(dummy_csum); 140b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, 141b47820edSDaeho Jeong EXT4_BLOCK_SIZE(inode->i_sb) - offset); 14241eb70ddSTao Ma 143cc8e94fdSDarrick J. Wong return cpu_to_le32(csum); 144cc8e94fdSDarrick J. Wong } 145cc8e94fdSDarrick J. Wong 146cc8e94fdSDarrick J. Wong static int ext4_xattr_block_csum_verify(struct inode *inode, 147dac7a4b4STheodore Ts'o struct buffer_head *bh) 148cc8e94fdSDarrick J. Wong { 149dac7a4b4STheodore Ts'o struct ext4_xattr_header *hdr = BHDR(bh); 150dac7a4b4STheodore Ts'o int ret = 1; 151dac7a4b4STheodore Ts'o 152dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) { 153dac7a4b4STheodore Ts'o lock_buffer(bh); 154dac7a4b4STheodore Ts'o ret = (hdr->h_checksum == ext4_xattr_block_csum(inode, 155dac7a4b4STheodore Ts'o bh->b_blocknr, hdr)); 156dac7a4b4STheodore Ts'o unlock_buffer(bh); 157dac7a4b4STheodore Ts'o } 158dac7a4b4STheodore Ts'o return ret; 159cc8e94fdSDarrick J. Wong } 160cc8e94fdSDarrick J. Wong 161cc8e94fdSDarrick J. Wong static void ext4_xattr_block_csum_set(struct inode *inode, 162cc8e94fdSDarrick J. Wong struct buffer_head *bh) 163cc8e94fdSDarrick J. Wong { 164dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) 165dac7a4b4STheodore Ts'o BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode, 166dac7a4b4STheodore Ts'o bh->b_blocknr, BHDR(bh)); 167cc8e94fdSDarrick J. Wong } 168cc8e94fdSDarrick J. Wong 16911e27528SStephen Hemminger static inline const struct xattr_handler * 170617ba13bSMingming Cao ext4_xattr_handler(int name_index) 171ac27a0ecSDave Kleikamp { 17211e27528SStephen Hemminger const struct xattr_handler *handler = NULL; 173ac27a0ecSDave Kleikamp 174617ba13bSMingming Cao if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) 175617ba13bSMingming Cao handler = ext4_xattr_handler_map[name_index]; 176ac27a0ecSDave Kleikamp return handler; 177ac27a0ecSDave Kleikamp } 178ac27a0ecSDave Kleikamp 179ac27a0ecSDave Kleikamp static int 1802c4f9923SEric Biggers ext4_xattr_check_entries(struct ext4_xattr_entry *entry, void *end, 181a0626e75SDarrick J. Wong void *value_start) 182ac27a0ecSDave Kleikamp { 183a0626e75SDarrick J. Wong struct ext4_xattr_entry *e = entry; 184a0626e75SDarrick J. Wong 185d7614cc1SEric Biggers /* Find the end of the names list */ 186a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(e)) { 187a0626e75SDarrick J. Wong struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); 188ac27a0ecSDave Kleikamp if ((void *)next >= end) 1896a797d27SDarrick J. Wong return -EFSCORRUPTED; 190a0626e75SDarrick J. Wong e = next; 191ac27a0ecSDave Kleikamp } 192a0626e75SDarrick J. Wong 193d7614cc1SEric Biggers /* Check the values */ 194a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(entry)) { 195e50e5129SAndreas Dilger if (entry->e_value_size != 0 && 196e50e5129SAndreas Dilger entry->e_value_inum == 0) { 197d7614cc1SEric Biggers u16 offs = le16_to_cpu(entry->e_value_offs); 198d7614cc1SEric Biggers u32 size = le32_to_cpu(entry->e_value_size); 199d7614cc1SEric Biggers void *value; 200d7614cc1SEric Biggers 201d7614cc1SEric Biggers /* 202d7614cc1SEric Biggers * The value cannot overlap the names, and the value 203d7614cc1SEric Biggers * with padding cannot extend beyond 'end'. Check both 204d7614cc1SEric Biggers * the padded and unpadded sizes, since the size may 205d7614cc1SEric Biggers * overflow to 0 when adding padding. 206d7614cc1SEric Biggers */ 207d7614cc1SEric Biggers if (offs > end - value_start) 2086a797d27SDarrick J. Wong return -EFSCORRUPTED; 209d7614cc1SEric Biggers value = value_start + offs; 210d7614cc1SEric Biggers if (value < (void *)e + sizeof(u32) || 211d7614cc1SEric Biggers size > end - value || 212d7614cc1SEric Biggers EXT4_XATTR_SIZE(size) > end - value) 213d7614cc1SEric Biggers return -EFSCORRUPTED; 214d7614cc1SEric Biggers } 215a0626e75SDarrick J. Wong entry = EXT4_XATTR_NEXT(entry); 216a0626e75SDarrick J. Wong } 217a0626e75SDarrick J. Wong 218ac27a0ecSDave Kleikamp return 0; 219ac27a0ecSDave Kleikamp } 220ac27a0ecSDave Kleikamp 221ac27a0ecSDave Kleikamp static inline int 222cc8e94fdSDarrick J. Wong ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) 223ac27a0ecSDave Kleikamp { 224cc8e94fdSDarrick J. Wong int error; 225cc8e94fdSDarrick J. Wong 226cc8e94fdSDarrick J. Wong if (buffer_verified(bh)) 227cc8e94fdSDarrick J. Wong return 0; 228cc8e94fdSDarrick J. Wong 229617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 230ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) 2316a797d27SDarrick J. Wong return -EFSCORRUPTED; 232dac7a4b4STheodore Ts'o if (!ext4_xattr_block_csum_verify(inode, bh)) 2336a797d27SDarrick J. Wong return -EFSBADCRC; 2342c4f9923SEric Biggers error = ext4_xattr_check_entries(BFIRST(bh), bh->b_data + bh->b_size, 235a0626e75SDarrick J. Wong bh->b_data); 236cc8e94fdSDarrick J. Wong if (!error) 237cc8e94fdSDarrick J. Wong set_buffer_verified(bh); 238cc8e94fdSDarrick J. Wong return error; 239ac27a0ecSDave Kleikamp } 240ac27a0ecSDave Kleikamp 2419e92f48cSTheodore Ts'o static int 2429e92f48cSTheodore Ts'o __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, 2439e92f48cSTheodore Ts'o void *end, const char *function, unsigned int line) 2449e92f48cSTheodore Ts'o { 2459e92f48cSTheodore Ts'o int error = -EFSCORRUPTED; 2469e92f48cSTheodore Ts'o 247290ab230SEric Biggers if (end - (void *)header < sizeof(*header) + sizeof(u32) || 24819962509SEric Biggers (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) 2499e92f48cSTheodore Ts'o goto errout; 2502c4f9923SEric Biggers error = ext4_xattr_check_entries(IFIRST(header), end, IFIRST(header)); 2519e92f48cSTheodore Ts'o errout: 2529e92f48cSTheodore Ts'o if (error) 2539e92f48cSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, 2549e92f48cSTheodore Ts'o "corrupted in-inode xattr"); 2559e92f48cSTheodore Ts'o return error; 2569e92f48cSTheodore Ts'o } 2579e92f48cSTheodore Ts'o 2589e92f48cSTheodore Ts'o #define xattr_check_inode(inode, header, end) \ 2599e92f48cSTheodore Ts'o __xattr_check_inode((inode), (header), (end), __func__, __LINE__) 2609e92f48cSTheodore Ts'o 261ac27a0ecSDave Kleikamp static int 262617ba13bSMingming Cao ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, 2636ba644b9SEric Biggers const char *name, int sorted) 264ac27a0ecSDave Kleikamp { 265617ba13bSMingming Cao struct ext4_xattr_entry *entry; 266ac27a0ecSDave Kleikamp size_t name_len; 267ac27a0ecSDave Kleikamp int cmp = 1; 268ac27a0ecSDave Kleikamp 269ac27a0ecSDave Kleikamp if (name == NULL) 270ac27a0ecSDave Kleikamp return -EINVAL; 271ac27a0ecSDave Kleikamp name_len = strlen(name); 272ac27a0ecSDave Kleikamp entry = *pentry; 273617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 274ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 275ac27a0ecSDave Kleikamp if (!cmp) 276ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 277ac27a0ecSDave Kleikamp if (!cmp) 278ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 279ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 280ac27a0ecSDave Kleikamp break; 281ac27a0ecSDave Kleikamp } 282ac27a0ecSDave Kleikamp *pentry = entry; 283ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 284ac27a0ecSDave Kleikamp } 285ac27a0ecSDave Kleikamp 286dec214d0STahsin Erdogan static u32 287dec214d0STahsin Erdogan ext4_xattr_inode_hash(struct ext4_sb_info *sbi, const void *buffer, size_t size) 288dec214d0STahsin Erdogan { 289dec214d0STahsin Erdogan return ext4_chksum(sbi, sbi->s_csum_seed, buffer, size); 290dec214d0STahsin Erdogan } 291dec214d0STahsin Erdogan 292dec214d0STahsin Erdogan static u64 ext4_xattr_inode_get_ref(struct inode *ea_inode) 293dec214d0STahsin Erdogan { 294dec214d0STahsin Erdogan return ((u64)ea_inode->i_ctime.tv_sec << 32) | 295dec214d0STahsin Erdogan ((u32)ea_inode->i_version); 296dec214d0STahsin Erdogan } 297dec214d0STahsin Erdogan 298dec214d0STahsin Erdogan static void ext4_xattr_inode_set_ref(struct inode *ea_inode, u64 ref_count) 299dec214d0STahsin Erdogan { 300dec214d0STahsin Erdogan ea_inode->i_ctime.tv_sec = (u32)(ref_count >> 32); 301dec214d0STahsin Erdogan ea_inode->i_version = (u32)ref_count; 302dec214d0STahsin Erdogan } 303dec214d0STahsin Erdogan 304dec214d0STahsin Erdogan static u32 ext4_xattr_inode_get_hash(struct inode *ea_inode) 305dec214d0STahsin Erdogan { 306dec214d0STahsin Erdogan return (u32)ea_inode->i_atime.tv_sec; 307dec214d0STahsin Erdogan } 308dec214d0STahsin Erdogan 309dec214d0STahsin Erdogan static void ext4_xattr_inode_set_hash(struct inode *ea_inode, u32 hash) 310dec214d0STahsin Erdogan { 311dec214d0STahsin Erdogan ea_inode->i_atime.tv_sec = hash; 312dec214d0STahsin Erdogan } 313dec214d0STahsin Erdogan 314e50e5129SAndreas Dilger /* 315e50e5129SAndreas Dilger * Read the EA value from an inode. 316e50e5129SAndreas Dilger */ 31790966693STahsin Erdogan static int ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t size) 318e50e5129SAndreas Dilger { 319e50e5129SAndreas Dilger unsigned long block = 0; 320dec214d0STahsin Erdogan struct buffer_head *bh; 32190966693STahsin Erdogan int blocksize = ea_inode->i_sb->s_blocksize; 32290966693STahsin Erdogan size_t csize, copied = 0; 323dec214d0STahsin Erdogan void *copy_pos = buf; 324e50e5129SAndreas Dilger 32590966693STahsin Erdogan while (copied < size) { 32690966693STahsin Erdogan csize = (size - copied) > blocksize ? blocksize : size - copied; 327e50e5129SAndreas Dilger bh = ext4_bread(NULL, ea_inode, block, 0); 32890966693STahsin Erdogan if (IS_ERR(bh)) 329e50e5129SAndreas Dilger return PTR_ERR(bh); 33090966693STahsin Erdogan if (!bh) 33190966693STahsin Erdogan return -EFSCORRUPTED; 33290966693STahsin Erdogan 333dec214d0STahsin Erdogan memcpy(copy_pos, bh->b_data, csize); 334e50e5129SAndreas Dilger brelse(bh); 335e50e5129SAndreas Dilger 336dec214d0STahsin Erdogan copy_pos += csize; 337e50e5129SAndreas Dilger block += 1; 33890966693STahsin Erdogan copied += csize; 339e50e5129SAndreas Dilger } 340e50e5129SAndreas Dilger return 0; 341e50e5129SAndreas Dilger } 342e50e5129SAndreas Dilger 343bab79b04STahsin Erdogan static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, 344bab79b04STahsin Erdogan struct inode **ea_inode) 345e50e5129SAndreas Dilger { 346bab79b04STahsin Erdogan struct inode *inode; 347bab79b04STahsin Erdogan int err; 348e50e5129SAndreas Dilger 349bab79b04STahsin Erdogan inode = ext4_iget(parent->i_sb, ea_ino); 350bab79b04STahsin Erdogan if (IS_ERR(inode)) { 351bab79b04STahsin Erdogan err = PTR_ERR(inode); 352dec214d0STahsin Erdogan ext4_error(parent->i_sb, 353dec214d0STahsin Erdogan "error while reading EA inode %lu err=%d", ea_ino, 354dec214d0STahsin Erdogan err); 355bab79b04STahsin Erdogan return err; 356e50e5129SAndreas Dilger } 357e50e5129SAndreas Dilger 358bab79b04STahsin Erdogan if (is_bad_inode(inode)) { 359dec214d0STahsin Erdogan ext4_error(parent->i_sb, 360dec214d0STahsin Erdogan "error while reading EA inode %lu is_bad_inode", 361dec214d0STahsin Erdogan ea_ino); 362bab79b04STahsin Erdogan err = -EIO; 363e50e5129SAndreas Dilger goto error; 364e50e5129SAndreas Dilger } 365e50e5129SAndreas Dilger 366bab79b04STahsin Erdogan if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) { 367dec214d0STahsin Erdogan ext4_error(parent->i_sb, 368dec214d0STahsin Erdogan "EA inode %lu does not have EXT4_EA_INODE_FL flag", 369dec214d0STahsin Erdogan ea_ino); 370bab79b04STahsin Erdogan err = -EINVAL; 371e50e5129SAndreas Dilger goto error; 372e50e5129SAndreas Dilger } 373e50e5129SAndreas Dilger 374bab79b04STahsin Erdogan *ea_inode = inode; 375bab79b04STahsin Erdogan return 0; 376e50e5129SAndreas Dilger error: 377bab79b04STahsin Erdogan iput(inode); 378bab79b04STahsin Erdogan return err; 379e50e5129SAndreas Dilger } 380e50e5129SAndreas Dilger 381dec214d0STahsin Erdogan static int 382dec214d0STahsin Erdogan ext4_xattr_inode_verify_hash(struct inode *ea_inode, void *buffer, size_t size) 383dec214d0STahsin Erdogan { 384dec214d0STahsin Erdogan u32 hash; 385dec214d0STahsin Erdogan 386dec214d0STahsin Erdogan /* Verify stored hash matches calculated hash. */ 387dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); 388dec214d0STahsin Erdogan if (hash != ext4_xattr_inode_get_hash(ea_inode)) 389dec214d0STahsin Erdogan return -EFSCORRUPTED; 390dec214d0STahsin Erdogan return 0; 391dec214d0STahsin Erdogan } 392dec214d0STahsin Erdogan 393dec214d0STahsin Erdogan #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec) 394dec214d0STahsin Erdogan 395e50e5129SAndreas Dilger /* 396e50e5129SAndreas Dilger * Read the value from the EA inode. 397e50e5129SAndreas Dilger */ 398e50e5129SAndreas Dilger static int 399e50e5129SAndreas Dilger ext4_xattr_inode_get(struct inode *inode, unsigned long ea_ino, void *buffer, 40090966693STahsin Erdogan size_t size) 401e50e5129SAndreas Dilger { 402dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 403bab79b04STahsin Erdogan struct inode *ea_inode; 404dec214d0STahsin Erdogan int err; 405e50e5129SAndreas Dilger 406dec214d0STahsin Erdogan err = ext4_xattr_inode_iget(inode, ea_ino, &ea_inode); 407dec214d0STahsin Erdogan if (err) { 408dec214d0STahsin Erdogan ea_inode = NULL; 409dec214d0STahsin Erdogan goto out; 410dec214d0STahsin Erdogan } 411e50e5129SAndreas Dilger 412dec214d0STahsin Erdogan if (i_size_read(ea_inode) != size) { 413dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 414dec214d0STahsin Erdogan "ea_inode file size=%llu entry size=%zu", 415dec214d0STahsin Erdogan i_size_read(ea_inode), size); 416dec214d0STahsin Erdogan err = -EFSCORRUPTED; 417dec214d0STahsin Erdogan goto out; 418dec214d0STahsin Erdogan } 419dec214d0STahsin Erdogan 420dec214d0STahsin Erdogan err = ext4_xattr_inode_read(ea_inode, buffer, size); 421dec214d0STahsin Erdogan if (err) 422dec214d0STahsin Erdogan goto out; 423dec214d0STahsin Erdogan 424dec214d0STahsin Erdogan err = ext4_xattr_inode_verify_hash(ea_inode, buffer, size); 425dec214d0STahsin Erdogan /* 426dec214d0STahsin Erdogan * Compatibility check for old Lustre ea_inode implementation. Old 427dec214d0STahsin Erdogan * version does not have hash validation, but it has a backpointer 428dec214d0STahsin Erdogan * from ea_inode to the parent inode. 429dec214d0STahsin Erdogan */ 430dec214d0STahsin Erdogan if (err == -EFSCORRUPTED) { 431dec214d0STahsin Erdogan if (EXT4_XATTR_INODE_GET_PARENT(ea_inode) != inode->i_ino || 432dec214d0STahsin Erdogan ea_inode->i_generation != inode->i_generation) { 433dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 434dec214d0STahsin Erdogan "EA inode hash validation failed"); 435dec214d0STahsin Erdogan goto out; 436dec214d0STahsin Erdogan } 437dec214d0STahsin Erdogan /* Do not add ea_inode to the cache. */ 438dec214d0STahsin Erdogan ea_inode_cache = NULL; 439dec214d0STahsin Erdogan } else if (err) 440dec214d0STahsin Erdogan goto out; 441dec214d0STahsin Erdogan 442dec214d0STahsin Erdogan if (ea_inode_cache) 443dec214d0STahsin Erdogan mb_cache_entry_create(ea_inode_cache, GFP_NOFS, 444dec214d0STahsin Erdogan ext4_xattr_inode_get_hash(ea_inode), 445dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 446dec214d0STahsin Erdogan out: 447e50e5129SAndreas Dilger iput(ea_inode); 448dec214d0STahsin Erdogan return err; 449e50e5129SAndreas Dilger } 450e50e5129SAndreas Dilger 451ac27a0ecSDave Kleikamp static int 452617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 453ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 454ac27a0ecSDave Kleikamp { 455ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 456617ba13bSMingming Cao struct ext4_xattr_entry *entry; 457ac27a0ecSDave Kleikamp size_t size; 458ac27a0ecSDave Kleikamp int error; 45947387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 460ac27a0ecSDave Kleikamp 461ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 462ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 463ac27a0ecSDave Kleikamp 464ac27a0ecSDave Kleikamp error = -ENODATA; 465617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 466ac27a0ecSDave Kleikamp goto cleanup; 467ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 468ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 469617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 470ac27a0ecSDave Kleikamp if (!bh) 471ac27a0ecSDave Kleikamp goto cleanup; 472ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 473ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 474cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 47524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 476617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 4776a797d27SDarrick J. Wong error = -EFSCORRUPTED; 478ac27a0ecSDave Kleikamp goto cleanup; 479ac27a0ecSDave Kleikamp } 48047387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bh); 481ac27a0ecSDave Kleikamp entry = BFIRST(bh); 4826ba644b9SEric Biggers error = ext4_xattr_find_entry(&entry, name_index, name, 1); 483ac27a0ecSDave Kleikamp if (error) 484ac27a0ecSDave Kleikamp goto cleanup; 485ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 486ac27a0ecSDave Kleikamp if (buffer) { 487ac27a0ecSDave Kleikamp error = -ERANGE; 488ac27a0ecSDave Kleikamp if (size > buffer_size) 489ac27a0ecSDave Kleikamp goto cleanup; 490e50e5129SAndreas Dilger if (entry->e_value_inum) { 491e50e5129SAndreas Dilger error = ext4_xattr_inode_get(inode, 492e50e5129SAndreas Dilger le32_to_cpu(entry->e_value_inum), 49390966693STahsin Erdogan buffer, size); 494e50e5129SAndreas Dilger if (error) 495e50e5129SAndreas Dilger goto cleanup; 496e50e5129SAndreas Dilger } else { 497e50e5129SAndreas Dilger memcpy(buffer, bh->b_data + 498e50e5129SAndreas Dilger le16_to_cpu(entry->e_value_offs), size); 499e50e5129SAndreas Dilger } 500ac27a0ecSDave Kleikamp } 501ac27a0ecSDave Kleikamp error = size; 502ac27a0ecSDave Kleikamp 503ac27a0ecSDave Kleikamp cleanup: 504ac27a0ecSDave Kleikamp brelse(bh); 505ac27a0ecSDave Kleikamp return error; 506ac27a0ecSDave Kleikamp } 507ac27a0ecSDave Kleikamp 508879b3825STao Ma int 509617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 510ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 511ac27a0ecSDave Kleikamp { 512617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 513617ba13bSMingming Cao struct ext4_xattr_entry *entry; 514617ba13bSMingming Cao struct ext4_inode *raw_inode; 515617ba13bSMingming Cao struct ext4_iloc iloc; 516ac27a0ecSDave Kleikamp size_t size; 517ac27a0ecSDave Kleikamp void *end; 518ac27a0ecSDave Kleikamp int error; 519ac27a0ecSDave Kleikamp 52019f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 521ac27a0ecSDave Kleikamp return -ENODATA; 522617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 523ac27a0ecSDave Kleikamp if (error) 524ac27a0ecSDave Kleikamp return error; 525617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 526ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 527617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 5289e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 529ac27a0ecSDave Kleikamp if (error) 530ac27a0ecSDave Kleikamp goto cleanup; 5316ba644b9SEric Biggers entry = IFIRST(header); 5326ba644b9SEric Biggers error = ext4_xattr_find_entry(&entry, name_index, name, 0); 533ac27a0ecSDave Kleikamp if (error) 534ac27a0ecSDave Kleikamp goto cleanup; 535ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 536ac27a0ecSDave Kleikamp if (buffer) { 537ac27a0ecSDave Kleikamp error = -ERANGE; 538ac27a0ecSDave Kleikamp if (size > buffer_size) 539ac27a0ecSDave Kleikamp goto cleanup; 540e50e5129SAndreas Dilger if (entry->e_value_inum) { 541e50e5129SAndreas Dilger error = ext4_xattr_inode_get(inode, 542e50e5129SAndreas Dilger le32_to_cpu(entry->e_value_inum), 54390966693STahsin Erdogan buffer, size); 544e50e5129SAndreas Dilger if (error) 545e50e5129SAndreas Dilger goto cleanup; 546e50e5129SAndreas Dilger } else { 547ac27a0ecSDave Kleikamp memcpy(buffer, (void *)IFIRST(header) + 548ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs), size); 549ac27a0ecSDave Kleikamp } 550e50e5129SAndreas Dilger } 551ac27a0ecSDave Kleikamp error = size; 552ac27a0ecSDave Kleikamp 553ac27a0ecSDave Kleikamp cleanup: 554ac27a0ecSDave Kleikamp brelse(iloc.bh); 555ac27a0ecSDave Kleikamp return error; 556ac27a0ecSDave Kleikamp } 557ac27a0ecSDave Kleikamp 558ac27a0ecSDave Kleikamp /* 559617ba13bSMingming Cao * ext4_xattr_get() 560ac27a0ecSDave Kleikamp * 561ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 562ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 563ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 564ac27a0ecSDave Kleikamp * 565ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 566ac27a0ecSDave Kleikamp * used / required on success. 567ac27a0ecSDave Kleikamp */ 568ac27a0ecSDave Kleikamp int 569617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 570ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 571ac27a0ecSDave Kleikamp { 572ac27a0ecSDave Kleikamp int error; 573ac27a0ecSDave Kleikamp 5740db1ff22STheodore Ts'o if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 5750db1ff22STheodore Ts'o return -EIO; 5760db1ff22STheodore Ts'o 577230b8c1aSZhang Zhen if (strlen(name) > 255) 578230b8c1aSZhang Zhen return -ERANGE; 579230b8c1aSZhang Zhen 580617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 581617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 582ac27a0ecSDave Kleikamp buffer_size); 583ac27a0ecSDave Kleikamp if (error == -ENODATA) 584617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 585ac27a0ecSDave Kleikamp buffer_size); 586617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 587ac27a0ecSDave Kleikamp return error; 588ac27a0ecSDave Kleikamp } 589ac27a0ecSDave Kleikamp 590ac27a0ecSDave Kleikamp static int 591431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 592ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 593ac27a0ecSDave Kleikamp { 594ac27a0ecSDave Kleikamp size_t rest = buffer_size; 595ac27a0ecSDave Kleikamp 596617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 59711e27528SStephen Hemminger const struct xattr_handler *handler = 598617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 599ac27a0ecSDave Kleikamp 600764a5c6bSAndreas Gruenbacher if (handler && (!handler->list || handler->list(dentry))) { 601764a5c6bSAndreas Gruenbacher const char *prefix = handler->prefix ?: handler->name; 602764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 603764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 604764a5c6bSAndreas Gruenbacher 605ac27a0ecSDave Kleikamp if (buffer) { 606ac27a0ecSDave Kleikamp if (size > rest) 607ac27a0ecSDave Kleikamp return -ERANGE; 608764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 609764a5c6bSAndreas Gruenbacher buffer += prefix_len; 610764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 611764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 612764a5c6bSAndreas Gruenbacher *buffer++ = 0; 613ac27a0ecSDave Kleikamp } 614ac27a0ecSDave Kleikamp rest -= size; 615ac27a0ecSDave Kleikamp } 616ac27a0ecSDave Kleikamp } 617764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 618ac27a0ecSDave Kleikamp } 619ac27a0ecSDave Kleikamp 620ac27a0ecSDave Kleikamp static int 621431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 622ac27a0ecSDave Kleikamp { 6232b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 624ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 625ac27a0ecSDave Kleikamp int error; 626ac27a0ecSDave Kleikamp 627ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 628ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 629ac27a0ecSDave Kleikamp 630ac27a0ecSDave Kleikamp error = 0; 631617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 632ac27a0ecSDave Kleikamp goto cleanup; 633ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 634ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 635617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 636ac27a0ecSDave Kleikamp error = -EIO; 637ac27a0ecSDave Kleikamp if (!bh) 638ac27a0ecSDave Kleikamp goto cleanup; 639ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 640ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 641cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 64224676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 643617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 6446a797d27SDarrick J. Wong error = -EFSCORRUPTED; 645ac27a0ecSDave Kleikamp goto cleanup; 646ac27a0ecSDave Kleikamp } 64747387409STahsin Erdogan ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); 648431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); 649ac27a0ecSDave Kleikamp 650ac27a0ecSDave Kleikamp cleanup: 651ac27a0ecSDave Kleikamp brelse(bh); 652ac27a0ecSDave Kleikamp 653ac27a0ecSDave Kleikamp return error; 654ac27a0ecSDave Kleikamp } 655ac27a0ecSDave Kleikamp 656ac27a0ecSDave Kleikamp static int 657431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 658ac27a0ecSDave Kleikamp { 6592b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 660617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 661617ba13bSMingming Cao struct ext4_inode *raw_inode; 662617ba13bSMingming Cao struct ext4_iloc iloc; 663ac27a0ecSDave Kleikamp void *end; 664ac27a0ecSDave Kleikamp int error; 665ac27a0ecSDave Kleikamp 66619f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 667ac27a0ecSDave Kleikamp return 0; 668617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 669ac27a0ecSDave Kleikamp if (error) 670ac27a0ecSDave Kleikamp return error; 671617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 672ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 673617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 6749e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 675ac27a0ecSDave Kleikamp if (error) 676ac27a0ecSDave Kleikamp goto cleanup; 677431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 678ac27a0ecSDave Kleikamp buffer, buffer_size); 679ac27a0ecSDave Kleikamp 680ac27a0ecSDave Kleikamp cleanup: 681ac27a0ecSDave Kleikamp brelse(iloc.bh); 682ac27a0ecSDave Kleikamp return error; 683ac27a0ecSDave Kleikamp } 684ac27a0ecSDave Kleikamp 685ac27a0ecSDave Kleikamp /* 686ba7ea1d8SEric Biggers * Inode operation listxattr() 687ba7ea1d8SEric Biggers * 688ba7ea1d8SEric Biggers * d_inode(dentry)->i_rwsem: don't care 689ac27a0ecSDave Kleikamp * 690ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 691ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 692ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 693ac27a0ecSDave Kleikamp * 694ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 695ac27a0ecSDave Kleikamp * used / required on success. 696ac27a0ecSDave Kleikamp */ 697ba7ea1d8SEric Biggers ssize_t 698ba7ea1d8SEric Biggers ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) 699ac27a0ecSDave Kleikamp { 700eaeef867STheodore Ts'o int ret, ret2; 701ac27a0ecSDave Kleikamp 7022b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 703eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 704eaeef867STheodore Ts'o if (ret < 0) 705eaeef867STheodore Ts'o goto errout; 706ac27a0ecSDave Kleikamp if (buffer) { 707eaeef867STheodore Ts'o buffer += ret; 708eaeef867STheodore Ts'o buffer_size -= ret; 709ac27a0ecSDave Kleikamp } 710eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 711eaeef867STheodore Ts'o if (ret < 0) 712eaeef867STheodore Ts'o goto errout; 713eaeef867STheodore Ts'o ret += ret2; 714eaeef867STheodore Ts'o errout: 7152b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 716eaeef867STheodore Ts'o return ret; 717ac27a0ecSDave Kleikamp } 718ac27a0ecSDave Kleikamp 719ac27a0ecSDave Kleikamp /* 720617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 721ac27a0ecSDave Kleikamp * not set, set it. 722ac27a0ecSDave Kleikamp */ 723617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 724ac27a0ecSDave Kleikamp struct super_block *sb) 725ac27a0ecSDave Kleikamp { 726e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 727ac27a0ecSDave Kleikamp return; 728ac27a0ecSDave Kleikamp 7295d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 730617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 731e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 732a0375156STheodore Ts'o ext4_handle_dirty_super(handle, sb); 733ac27a0ecSDave Kleikamp } 734ac27a0ecSDave Kleikamp } 735ac27a0ecSDave Kleikamp 7367a9ca53aSTahsin Erdogan int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) 7377a9ca53aSTahsin Erdogan { 7387a9ca53aSTahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 7397a9ca53aSTahsin Erdogan struct buffer_head *bh = NULL; 7407a9ca53aSTahsin Erdogan struct ext4_inode *raw_inode; 7417a9ca53aSTahsin Erdogan struct ext4_xattr_ibody_header *header; 7427a9ca53aSTahsin Erdogan struct ext4_xattr_entry *entry; 7437a9ca53aSTahsin Erdogan qsize_t ea_inode_refs = 0; 7447a9ca53aSTahsin Erdogan void *end; 7457a9ca53aSTahsin Erdogan int ret; 7467a9ca53aSTahsin Erdogan 7477a9ca53aSTahsin Erdogan lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); 7487a9ca53aSTahsin Erdogan 7497a9ca53aSTahsin Erdogan if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 7507a9ca53aSTahsin Erdogan ret = ext4_get_inode_loc(inode, &iloc); 7517a9ca53aSTahsin Erdogan if (ret) 7527a9ca53aSTahsin Erdogan goto out; 7537a9ca53aSTahsin Erdogan raw_inode = ext4_raw_inode(&iloc); 7547a9ca53aSTahsin Erdogan header = IHDR(inode, raw_inode); 7557a9ca53aSTahsin Erdogan end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 7567a9ca53aSTahsin Erdogan ret = xattr_check_inode(inode, header, end); 7577a9ca53aSTahsin Erdogan if (ret) 7587a9ca53aSTahsin Erdogan goto out; 7597a9ca53aSTahsin Erdogan 7607a9ca53aSTahsin Erdogan for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); 7617a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 7627a9ca53aSTahsin Erdogan if (entry->e_value_inum) 7637a9ca53aSTahsin Erdogan ea_inode_refs++; 7647a9ca53aSTahsin Erdogan } 7657a9ca53aSTahsin Erdogan 7667a9ca53aSTahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 7677a9ca53aSTahsin Erdogan bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 7687a9ca53aSTahsin Erdogan if (!bh) { 7697a9ca53aSTahsin Erdogan ret = -EIO; 7707a9ca53aSTahsin Erdogan goto out; 7717a9ca53aSTahsin Erdogan } 7727a9ca53aSTahsin Erdogan 7737a9ca53aSTahsin Erdogan if (ext4_xattr_check_block(inode, bh)) { 7747a9ca53aSTahsin Erdogan ret = -EFSCORRUPTED; 7757a9ca53aSTahsin Erdogan goto out; 7767a9ca53aSTahsin Erdogan } 7777a9ca53aSTahsin Erdogan 7787a9ca53aSTahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 7797a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 7807a9ca53aSTahsin Erdogan if (entry->e_value_inum) 7817a9ca53aSTahsin Erdogan ea_inode_refs++; 7827a9ca53aSTahsin Erdogan } 7837a9ca53aSTahsin Erdogan *usage = ea_inode_refs + 1; 7847a9ca53aSTahsin Erdogan ret = 0; 7857a9ca53aSTahsin Erdogan out: 7867a9ca53aSTahsin Erdogan brelse(iloc.bh); 7877a9ca53aSTahsin Erdogan brelse(bh); 7887a9ca53aSTahsin Erdogan return ret; 7897a9ca53aSTahsin Erdogan } 7907a9ca53aSTahsin Erdogan 791dec214d0STahsin Erdogan static inline size_t round_up_cluster(struct inode *inode, size_t length) 792dec214d0STahsin Erdogan { 793dec214d0STahsin Erdogan struct super_block *sb = inode->i_sb; 794dec214d0STahsin Erdogan size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + 795dec214d0STahsin Erdogan inode->i_blkbits); 796dec214d0STahsin Erdogan size_t mask = ~(cluster_size - 1); 797dec214d0STahsin Erdogan 798dec214d0STahsin Erdogan return (length + cluster_size - 1) & mask; 799dec214d0STahsin Erdogan } 800dec214d0STahsin Erdogan 801dec214d0STahsin Erdogan static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) 802dec214d0STahsin Erdogan { 803dec214d0STahsin Erdogan int err; 804dec214d0STahsin Erdogan 805dec214d0STahsin Erdogan err = dquot_alloc_inode(inode); 806dec214d0STahsin Erdogan if (err) 807dec214d0STahsin Erdogan return err; 808dec214d0STahsin Erdogan err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); 809dec214d0STahsin Erdogan if (err) 810dec214d0STahsin Erdogan dquot_free_inode(inode); 811dec214d0STahsin Erdogan return err; 812dec214d0STahsin Erdogan } 813dec214d0STahsin Erdogan 814dec214d0STahsin Erdogan static void ext4_xattr_inode_free_quota(struct inode *inode, size_t len) 815dec214d0STahsin Erdogan { 816dec214d0STahsin Erdogan dquot_free_space_nodirty(inode, round_up_cluster(inode, len)); 817dec214d0STahsin Erdogan dquot_free_inode(inode); 818dec214d0STahsin Erdogan } 819dec214d0STahsin Erdogan 820dec214d0STahsin Erdogan static int __ext4_xattr_set_credits(struct inode *inode, 821dec214d0STahsin Erdogan struct buffer_head *block_bh, 822dec214d0STahsin Erdogan size_t value_len) 823dec214d0STahsin Erdogan { 824dec214d0STahsin Erdogan struct super_block *sb = inode->i_sb; 825dec214d0STahsin Erdogan int credits; 826dec214d0STahsin Erdogan int blocks; 827dec214d0STahsin Erdogan 828dec214d0STahsin Erdogan /* 829dec214d0STahsin Erdogan * 1) Owner inode update 830dec214d0STahsin Erdogan * 2) Ref count update on old xattr block 831dec214d0STahsin Erdogan * 3) new xattr block 832dec214d0STahsin Erdogan * 4) block bitmap update for new xattr block 833dec214d0STahsin Erdogan * 5) group descriptor for new xattr block 834dec214d0STahsin Erdogan * 6) block bitmap update for old xattr block 835dec214d0STahsin Erdogan * 7) group descriptor for old block 836dec214d0STahsin Erdogan * 837dec214d0STahsin Erdogan * 6 & 7 can happen if we have two racing threads T_a and T_b 838dec214d0STahsin Erdogan * which are each trying to set an xattr on inodes I_a and I_b 839dec214d0STahsin Erdogan * which were both initially sharing an xattr block. 840dec214d0STahsin Erdogan */ 841dec214d0STahsin Erdogan credits = 7; 842dec214d0STahsin Erdogan 843dec214d0STahsin Erdogan /* Quota updates. */ 844dec214d0STahsin Erdogan credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); 845dec214d0STahsin Erdogan 846dec214d0STahsin Erdogan /* 847dec214d0STahsin Erdogan * In case of inline data, we may push out the data to a block, 848dec214d0STahsin Erdogan * so we need to reserve credits for this eventuality 849dec214d0STahsin Erdogan */ 850dec214d0STahsin Erdogan if (ext4_has_inline_data(inode)) 851dec214d0STahsin Erdogan credits += ext4_writepage_trans_blocks(inode) + 1; 852dec214d0STahsin Erdogan 853dec214d0STahsin Erdogan /* We are done if ea_inode feature is not enabled. */ 854dec214d0STahsin Erdogan if (!ext4_has_feature_ea_inode(sb)) 855dec214d0STahsin Erdogan return credits; 856dec214d0STahsin Erdogan 857dec214d0STahsin Erdogan /* New ea_inode, inode map, block bitmap, group descriptor. */ 858dec214d0STahsin Erdogan credits += 4; 859dec214d0STahsin Erdogan 860dec214d0STahsin Erdogan /* Data blocks. */ 861dec214d0STahsin Erdogan blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 862dec214d0STahsin Erdogan 863dec214d0STahsin Erdogan /* Indirection block or one level of extent tree. */ 864dec214d0STahsin Erdogan blocks += 1; 865dec214d0STahsin Erdogan 866dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 867dec214d0STahsin Erdogan credits += blocks * 2; 868dec214d0STahsin Erdogan 869dec214d0STahsin Erdogan /* Blocks themselves. */ 870dec214d0STahsin Erdogan credits += blocks; 871dec214d0STahsin Erdogan 872dec214d0STahsin Erdogan /* Dereference ea_inode holding old xattr value. 873dec214d0STahsin Erdogan * Old ea_inode, inode map, block bitmap, group descriptor. 874dec214d0STahsin Erdogan */ 875dec214d0STahsin Erdogan credits += 4; 876dec214d0STahsin Erdogan 877dec214d0STahsin Erdogan /* Data blocks for old ea_inode. */ 878dec214d0STahsin Erdogan blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; 879dec214d0STahsin Erdogan 880dec214d0STahsin Erdogan /* Indirection block or one level of extent tree for old ea_inode. */ 881dec214d0STahsin Erdogan blocks += 1; 882dec214d0STahsin Erdogan 883dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 884dec214d0STahsin Erdogan credits += blocks * 2; 885dec214d0STahsin Erdogan 886dec214d0STahsin Erdogan /* We may need to clone the existing xattr block in which case we need 887dec214d0STahsin Erdogan * to increment ref counts for existing ea_inodes referenced by it. 888dec214d0STahsin Erdogan */ 889dec214d0STahsin Erdogan if (block_bh) { 890dec214d0STahsin Erdogan struct ext4_xattr_entry *entry = BFIRST(block_bh); 891dec214d0STahsin Erdogan 892dec214d0STahsin Erdogan for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) 893dec214d0STahsin Erdogan if (entry->e_value_inum) 894dec214d0STahsin Erdogan /* Ref count update on ea_inode. */ 895dec214d0STahsin Erdogan credits += 1; 896dec214d0STahsin Erdogan } 897dec214d0STahsin Erdogan return credits; 898dec214d0STahsin Erdogan } 899dec214d0STahsin Erdogan 90030a7eb97STahsin Erdogan static int ext4_xattr_ensure_credits(handle_t *handle, struct inode *inode, 90130a7eb97STahsin Erdogan int credits, struct buffer_head *bh, 90230a7eb97STahsin Erdogan bool dirty, bool block_csum) 90330a7eb97STahsin Erdogan { 90430a7eb97STahsin Erdogan int error; 90530a7eb97STahsin Erdogan 90630a7eb97STahsin Erdogan if (!ext4_handle_valid(handle)) 90730a7eb97STahsin Erdogan return 0; 90830a7eb97STahsin Erdogan 90930a7eb97STahsin Erdogan if (handle->h_buffer_credits >= credits) 91030a7eb97STahsin Erdogan return 0; 91130a7eb97STahsin Erdogan 91230a7eb97STahsin Erdogan error = ext4_journal_extend(handle, credits - handle->h_buffer_credits); 91330a7eb97STahsin Erdogan if (!error) 91430a7eb97STahsin Erdogan return 0; 91530a7eb97STahsin Erdogan if (error < 0) { 91630a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Extend journal (error %d)", error); 91730a7eb97STahsin Erdogan return error; 91830a7eb97STahsin Erdogan } 91930a7eb97STahsin Erdogan 92030a7eb97STahsin Erdogan if (bh && dirty) { 92130a7eb97STahsin Erdogan if (block_csum) 92230a7eb97STahsin Erdogan ext4_xattr_block_csum_set(inode, bh); 92330a7eb97STahsin Erdogan error = ext4_handle_dirty_metadata(handle, NULL, bh); 92430a7eb97STahsin Erdogan if (error) { 92530a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Handle metadata (error %d)", 92630a7eb97STahsin Erdogan error); 92730a7eb97STahsin Erdogan return error; 92830a7eb97STahsin Erdogan } 92930a7eb97STahsin Erdogan } 93030a7eb97STahsin Erdogan 93130a7eb97STahsin Erdogan error = ext4_journal_restart(handle, credits); 93230a7eb97STahsin Erdogan if (error) { 93330a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Restart journal (error %d)", error); 93430a7eb97STahsin Erdogan return error; 93530a7eb97STahsin Erdogan } 93630a7eb97STahsin Erdogan 93730a7eb97STahsin Erdogan if (bh) { 93830a7eb97STahsin Erdogan error = ext4_journal_get_write_access(handle, bh); 93930a7eb97STahsin Erdogan if (error) { 94030a7eb97STahsin Erdogan ext4_warning(inode->i_sb, 94130a7eb97STahsin Erdogan "Get write access failed (error %d)", 94230a7eb97STahsin Erdogan error); 94330a7eb97STahsin Erdogan return error; 94430a7eb97STahsin Erdogan } 94530a7eb97STahsin Erdogan } 94630a7eb97STahsin Erdogan return 0; 94730a7eb97STahsin Erdogan } 94830a7eb97STahsin Erdogan 949dec214d0STahsin Erdogan static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, 950dec214d0STahsin Erdogan int ref_change) 951dec214d0STahsin Erdogan { 952dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(ea_inode); 953dec214d0STahsin Erdogan struct ext4_iloc iloc; 954dec214d0STahsin Erdogan s64 ref_count; 955dec214d0STahsin Erdogan u32 hash; 956dec214d0STahsin Erdogan int ret; 957dec214d0STahsin Erdogan 958dec214d0STahsin Erdogan inode_lock(ea_inode); 959dec214d0STahsin Erdogan 960dec214d0STahsin Erdogan ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); 961dec214d0STahsin Erdogan if (ret) { 962dec214d0STahsin Erdogan iloc.bh = NULL; 963dec214d0STahsin Erdogan goto out; 964dec214d0STahsin Erdogan } 965dec214d0STahsin Erdogan 966dec214d0STahsin Erdogan ref_count = ext4_xattr_inode_get_ref(ea_inode); 967dec214d0STahsin Erdogan ref_count += ref_change; 968dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, ref_count); 969dec214d0STahsin Erdogan 970dec214d0STahsin Erdogan if (ref_change > 0) { 971dec214d0STahsin Erdogan WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", 972dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 973dec214d0STahsin Erdogan 974dec214d0STahsin Erdogan if (ref_count == 1) { 975dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", 976dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 977dec214d0STahsin Erdogan 978dec214d0STahsin Erdogan set_nlink(ea_inode, 1); 979dec214d0STahsin Erdogan ext4_orphan_del(handle, ea_inode); 980dec214d0STahsin Erdogan 981dec214d0STahsin Erdogan hash = ext4_xattr_inode_get_hash(ea_inode); 982dec214d0STahsin Erdogan mb_cache_entry_create(ea_inode_cache, GFP_NOFS, hash, 983dec214d0STahsin Erdogan ea_inode->i_ino, 984dec214d0STahsin Erdogan true /* reusable */); 985dec214d0STahsin Erdogan } 986dec214d0STahsin Erdogan } else { 987dec214d0STahsin Erdogan WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", 988dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 989dec214d0STahsin Erdogan 990dec214d0STahsin Erdogan if (ref_count == 0) { 991dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink != 1, 992dec214d0STahsin Erdogan "EA inode %lu i_nlink=%u", 993dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 994dec214d0STahsin Erdogan 995dec214d0STahsin Erdogan clear_nlink(ea_inode); 996dec214d0STahsin Erdogan ext4_orphan_add(handle, ea_inode); 997dec214d0STahsin Erdogan 998dec214d0STahsin Erdogan hash = ext4_xattr_inode_get_hash(ea_inode); 999dec214d0STahsin Erdogan mb_cache_entry_delete(ea_inode_cache, hash, 1000dec214d0STahsin Erdogan ea_inode->i_ino); 1001dec214d0STahsin Erdogan } 1002dec214d0STahsin Erdogan } 1003dec214d0STahsin Erdogan 1004dec214d0STahsin Erdogan ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); 1005dec214d0STahsin Erdogan iloc.bh = NULL; 1006dec214d0STahsin Erdogan if (ret) 1007dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 1008dec214d0STahsin Erdogan "ext4_mark_iloc_dirty() failed ret=%d", ret); 1009dec214d0STahsin Erdogan out: 1010dec214d0STahsin Erdogan brelse(iloc.bh); 1011dec214d0STahsin Erdogan inode_unlock(ea_inode); 1012dec214d0STahsin Erdogan return ret; 1013dec214d0STahsin Erdogan } 1014dec214d0STahsin Erdogan 1015dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) 1016dec214d0STahsin Erdogan { 1017dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, 1); 1018dec214d0STahsin Erdogan } 1019dec214d0STahsin Erdogan 1020dec214d0STahsin Erdogan static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) 1021dec214d0STahsin Erdogan { 1022dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, -1); 1023dec214d0STahsin Erdogan } 1024dec214d0STahsin Erdogan 1025dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, 1026dec214d0STahsin Erdogan struct ext4_xattr_entry *first) 1027dec214d0STahsin Erdogan { 1028dec214d0STahsin Erdogan struct inode *ea_inode; 1029dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 1030dec214d0STahsin Erdogan struct ext4_xattr_entry *failed_entry; 1031dec214d0STahsin Erdogan unsigned int ea_ino; 1032dec214d0STahsin Erdogan int err, saved_err; 1033dec214d0STahsin Erdogan 1034dec214d0STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 1035dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1036dec214d0STahsin Erdogan if (!entry->e_value_inum) 1037dec214d0STahsin Erdogan continue; 1038dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1039dec214d0STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, &ea_inode); 1040dec214d0STahsin Erdogan if (err) 1041dec214d0STahsin Erdogan goto cleanup; 1042dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1043dec214d0STahsin Erdogan if (err) { 1044dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "inc ref error %d", err); 1045dec214d0STahsin Erdogan iput(ea_inode); 1046dec214d0STahsin Erdogan goto cleanup; 1047dec214d0STahsin Erdogan } 1048dec214d0STahsin Erdogan iput(ea_inode); 1049dec214d0STahsin Erdogan } 1050dec214d0STahsin Erdogan return 0; 1051dec214d0STahsin Erdogan 1052dec214d0STahsin Erdogan cleanup: 1053dec214d0STahsin Erdogan saved_err = err; 1054dec214d0STahsin Erdogan failed_entry = entry; 1055dec214d0STahsin Erdogan 1056dec214d0STahsin Erdogan for (entry = first; entry != failed_entry; 1057dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1058dec214d0STahsin Erdogan if (!entry->e_value_inum) 1059dec214d0STahsin Erdogan continue; 1060dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1061dec214d0STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, &ea_inode); 1062dec214d0STahsin Erdogan if (err) { 1063dec214d0STahsin Erdogan ext4_warning(parent->i_sb, 1064dec214d0STahsin Erdogan "cleanup ea_ino %u iget error %d", ea_ino, 1065dec214d0STahsin Erdogan err); 1066dec214d0STahsin Erdogan continue; 1067dec214d0STahsin Erdogan } 1068dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1069dec214d0STahsin Erdogan if (err) 1070dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "cleanup dec ref error %d", 1071dec214d0STahsin Erdogan err); 1072dec214d0STahsin Erdogan iput(ea_inode); 1073dec214d0STahsin Erdogan } 1074dec214d0STahsin Erdogan return saved_err; 1075dec214d0STahsin Erdogan } 1076dec214d0STahsin Erdogan 107730a7eb97STahsin Erdogan static void 1078dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, 107930a7eb97STahsin Erdogan struct buffer_head *bh, 108030a7eb97STahsin Erdogan struct ext4_xattr_entry *first, bool block_csum, 108130a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1082dec214d0STahsin Erdogan int extra_credits, bool skip_quota) 108330a7eb97STahsin Erdogan { 108430a7eb97STahsin Erdogan struct inode *ea_inode; 108530a7eb97STahsin Erdogan struct ext4_xattr_entry *entry; 108630a7eb97STahsin Erdogan bool dirty = false; 108730a7eb97STahsin Erdogan unsigned int ea_ino; 108830a7eb97STahsin Erdogan int err; 108930a7eb97STahsin Erdogan int credits; 109030a7eb97STahsin Erdogan 109130a7eb97STahsin Erdogan /* One credit for dec ref on ea_inode, one for orphan list addition, */ 109230a7eb97STahsin Erdogan credits = 2 + extra_credits; 109330a7eb97STahsin Erdogan 109430a7eb97STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 109530a7eb97STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 109630a7eb97STahsin Erdogan if (!entry->e_value_inum) 109730a7eb97STahsin Erdogan continue; 109830a7eb97STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 109930a7eb97STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, &ea_inode); 110030a7eb97STahsin Erdogan if (err) 110130a7eb97STahsin Erdogan continue; 110230a7eb97STahsin Erdogan 110330a7eb97STahsin Erdogan err = ext4_expand_inode_array(ea_inode_array, ea_inode); 110430a7eb97STahsin Erdogan if (err) { 110530a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, 110630a7eb97STahsin Erdogan "Expand inode array err=%d", err); 110730a7eb97STahsin Erdogan iput(ea_inode); 110830a7eb97STahsin Erdogan continue; 110930a7eb97STahsin Erdogan } 111030a7eb97STahsin Erdogan 111130a7eb97STahsin Erdogan err = ext4_xattr_ensure_credits(handle, parent, credits, bh, 111230a7eb97STahsin Erdogan dirty, block_csum); 111330a7eb97STahsin Erdogan if (err) { 111430a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, "Ensure credits err=%d", 111530a7eb97STahsin Erdogan err); 111630a7eb97STahsin Erdogan continue; 111730a7eb97STahsin Erdogan } 111830a7eb97STahsin Erdogan 1119dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1120dec214d0STahsin Erdogan if (err) { 1121dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", 1122dec214d0STahsin Erdogan err); 1123dec214d0STahsin Erdogan continue; 1124dec214d0STahsin Erdogan } 1125dec214d0STahsin Erdogan 1126dec214d0STahsin Erdogan if (!skip_quota) 1127dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(parent, 1128dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 112930a7eb97STahsin Erdogan 113030a7eb97STahsin Erdogan /* 113130a7eb97STahsin Erdogan * Forget about ea_inode within the same transaction that 113230a7eb97STahsin Erdogan * decrements the ref count. This avoids duplicate decrements in 113330a7eb97STahsin Erdogan * case the rest of the work spills over to subsequent 113430a7eb97STahsin Erdogan * transactions. 113530a7eb97STahsin Erdogan */ 113630a7eb97STahsin Erdogan entry->e_value_inum = 0; 113730a7eb97STahsin Erdogan entry->e_value_size = 0; 113830a7eb97STahsin Erdogan 113930a7eb97STahsin Erdogan dirty = true; 114030a7eb97STahsin Erdogan } 114130a7eb97STahsin Erdogan 114230a7eb97STahsin Erdogan if (dirty) { 114330a7eb97STahsin Erdogan /* 114430a7eb97STahsin Erdogan * Note that we are deliberately skipping csum calculation for 114530a7eb97STahsin Erdogan * the final update because we do not expect any journal 114630a7eb97STahsin Erdogan * restarts until xattr block is freed. 114730a7eb97STahsin Erdogan */ 114830a7eb97STahsin Erdogan 114930a7eb97STahsin Erdogan err = ext4_handle_dirty_metadata(handle, NULL, bh); 115030a7eb97STahsin Erdogan if (err) 115130a7eb97STahsin Erdogan ext4_warning_inode(parent, 115230a7eb97STahsin Erdogan "handle dirty metadata err=%d", err); 115330a7eb97STahsin Erdogan } 115430a7eb97STahsin Erdogan } 115530a7eb97STahsin Erdogan 1156ac27a0ecSDave Kleikamp /* 1157ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 1158ec4cb1aaSJan Kara * otherwise free the block. 1159ac27a0ecSDave Kleikamp */ 1160ac27a0ecSDave Kleikamp static void 1161617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 1162dec214d0STahsin Erdogan struct buffer_head *bh, 1163dec214d0STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1164dec214d0STahsin Erdogan int extra_credits) 1165ac27a0ecSDave Kleikamp { 116647387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 11676048c64bSAndreas Gruenbacher u32 hash, ref; 11688a2bfdcbSMingming Cao int error = 0; 1169ac27a0ecSDave Kleikamp 11705d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 11718a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 11728a2bfdcbSMingming Cao if (error) 11738a2bfdcbSMingming Cao goto out; 11748a2bfdcbSMingming Cao 11758a2bfdcbSMingming Cao lock_buffer(bh); 11766048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 11776048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 11786048c64bSAndreas Gruenbacher if (ref == 1) { 1179ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 118082939d79SJan Kara /* 118182939d79SJan Kara * This must happen under buffer lock for 118282939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 118382939d79SJan Kara */ 118447387409STahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, bh->b_blocknr); 1185ac27a0ecSDave Kleikamp get_bh(bh); 1186ec4cb1aaSJan Kara unlock_buffer(bh); 1187dec214d0STahsin Erdogan 1188dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) 1189dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, bh, 1190dec214d0STahsin Erdogan BFIRST(bh), 1191dec214d0STahsin Erdogan true /* block_csum */, 1192dec214d0STahsin Erdogan ea_inode_array, 1193dec214d0STahsin Erdogan extra_credits, 1194dec214d0STahsin Erdogan true /* skip_quota */); 1195e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 1196e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 1197e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 1198ac27a0ecSDave Kleikamp } else { 11996048c64bSAndreas Gruenbacher ref--; 12006048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 12016048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 12026048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 12036048c64bSAndreas Gruenbacher 120447387409STahsin Erdogan ce = mb_cache_entry_get(ea_block_cache, hash, 12056048c64bSAndreas Gruenbacher bh->b_blocknr); 12066048c64bSAndreas Gruenbacher if (ce) { 12076048c64bSAndreas Gruenbacher ce->e_reusable = 1; 120847387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 12096048c64bSAndreas Gruenbacher } 12106048c64bSAndreas Gruenbacher } 12116048c64bSAndreas Gruenbacher 1212dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bh); 1213ec4cb1aaSJan Kara /* 1214ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 1215ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 1216ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 1217ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 1218ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 1219dac7a4b4STheodore Ts'o * call ext4_handle_dirty_metadata() with locked buffer as 1220ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 1221ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 1222ec4cb1aaSJan Kara */ 1223ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 1224dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1225c1bb05a6SEric Sandeen unlock_buffer(bh); 1226ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 1227dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1228ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 12290390131bSFrank Mayhar ext4_handle_sync(handle); 12301231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 1231ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 1232ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 1233ac27a0ecSDave Kleikamp } 12348a2bfdcbSMingming Cao out: 12358a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 12368a2bfdcbSMingming Cao return; 1237ac27a0ecSDave Kleikamp } 1238ac27a0ecSDave Kleikamp 12396dd4ee7cSKalpak Shah /* 12406dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 12416dd4ee7cSKalpak Shah * bytes used by EA entries. 12426dd4ee7cSKalpak Shah */ 12436dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 12446dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 12456dd4ee7cSKalpak Shah { 12466dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1247e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 12486dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 12496dd4ee7cSKalpak Shah if (offs < *min_offs) 12506dd4ee7cSKalpak Shah *min_offs = offs; 12516dd4ee7cSKalpak Shah } 12527b1b2c1bSTheodore Ts'o if (total) 12537b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 12546dd4ee7cSKalpak Shah } 12556dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 12566dd4ee7cSKalpak Shah } 12576dd4ee7cSKalpak Shah 1258e50e5129SAndreas Dilger /* 1259e50e5129SAndreas Dilger * Write the value of the EA in an inode. 1260e50e5129SAndreas Dilger */ 1261e50e5129SAndreas Dilger static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, 1262e50e5129SAndreas Dilger const void *buf, int bufsize) 1263e50e5129SAndreas Dilger { 1264e50e5129SAndreas Dilger struct buffer_head *bh = NULL; 1265e50e5129SAndreas Dilger unsigned long block = 0; 1266dec214d0STahsin Erdogan int blocksize = ea_inode->i_sb->s_blocksize; 1267dec214d0STahsin Erdogan int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; 1268e50e5129SAndreas Dilger int csize, wsize = 0; 1269e50e5129SAndreas Dilger int ret = 0; 1270e50e5129SAndreas Dilger int retries = 0; 1271e50e5129SAndreas Dilger 1272e50e5129SAndreas Dilger retry: 1273e50e5129SAndreas Dilger while (ret >= 0 && ret < max_blocks) { 1274e50e5129SAndreas Dilger struct ext4_map_blocks map; 1275e50e5129SAndreas Dilger map.m_lblk = block += ret; 1276e50e5129SAndreas Dilger map.m_len = max_blocks -= ret; 1277e50e5129SAndreas Dilger 1278e50e5129SAndreas Dilger ret = ext4_map_blocks(handle, ea_inode, &map, 1279e50e5129SAndreas Dilger EXT4_GET_BLOCKS_CREATE); 1280e50e5129SAndreas Dilger if (ret <= 0) { 1281e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1282e50e5129SAndreas Dilger if (ret == -ENOSPC && 1283e50e5129SAndreas Dilger ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { 1284e50e5129SAndreas Dilger ret = 0; 1285e50e5129SAndreas Dilger goto retry; 1286e50e5129SAndreas Dilger } 1287e50e5129SAndreas Dilger break; 1288e50e5129SAndreas Dilger } 1289e50e5129SAndreas Dilger } 1290e50e5129SAndreas Dilger 1291e50e5129SAndreas Dilger if (ret < 0) 1292e50e5129SAndreas Dilger return ret; 1293e50e5129SAndreas Dilger 1294e50e5129SAndreas Dilger block = 0; 1295e50e5129SAndreas Dilger while (wsize < bufsize) { 1296e50e5129SAndreas Dilger if (bh != NULL) 1297e50e5129SAndreas Dilger brelse(bh); 1298e50e5129SAndreas Dilger csize = (bufsize - wsize) > blocksize ? blocksize : 1299e50e5129SAndreas Dilger bufsize - wsize; 1300e50e5129SAndreas Dilger bh = ext4_getblk(handle, ea_inode, block, 0); 1301e50e5129SAndreas Dilger if (IS_ERR(bh)) 1302e50e5129SAndreas Dilger return PTR_ERR(bh); 1303e50e5129SAndreas Dilger ret = ext4_journal_get_write_access(handle, bh); 1304e50e5129SAndreas Dilger if (ret) 1305e50e5129SAndreas Dilger goto out; 1306e50e5129SAndreas Dilger 1307e50e5129SAndreas Dilger memcpy(bh->b_data, buf, csize); 1308e50e5129SAndreas Dilger set_buffer_uptodate(bh); 1309e50e5129SAndreas Dilger ext4_handle_dirty_metadata(handle, ea_inode, bh); 1310e50e5129SAndreas Dilger 1311e50e5129SAndreas Dilger buf += csize; 1312e50e5129SAndreas Dilger wsize += csize; 1313e50e5129SAndreas Dilger block += 1; 1314e50e5129SAndreas Dilger } 1315e50e5129SAndreas Dilger 1316e50e5129SAndreas Dilger inode_lock(ea_inode); 1317e50e5129SAndreas Dilger i_size_write(ea_inode, wsize); 1318e50e5129SAndreas Dilger ext4_update_i_disksize(ea_inode, wsize); 1319e50e5129SAndreas Dilger inode_unlock(ea_inode); 1320e50e5129SAndreas Dilger 1321e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1322e50e5129SAndreas Dilger 1323e50e5129SAndreas Dilger out: 1324e50e5129SAndreas Dilger brelse(bh); 1325e50e5129SAndreas Dilger 1326e50e5129SAndreas Dilger return ret; 1327e50e5129SAndreas Dilger } 1328e50e5129SAndreas Dilger 1329e50e5129SAndreas Dilger /* 1330e50e5129SAndreas Dilger * Create an inode to store the value of a large EA. 1331e50e5129SAndreas Dilger */ 1332e50e5129SAndreas Dilger static struct inode *ext4_xattr_inode_create(handle_t *handle, 1333dec214d0STahsin Erdogan struct inode *inode, u32 hash) 1334e50e5129SAndreas Dilger { 1335e50e5129SAndreas Dilger struct inode *ea_inode = NULL; 13369e1ba001STahsin Erdogan uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; 1337bd3b963bSTahsin Erdogan int err; 1338e50e5129SAndreas Dilger 1339e50e5129SAndreas Dilger /* 1340e50e5129SAndreas Dilger * Let the next inode be the goal, so we try and allocate the EA inode 1341e50e5129SAndreas Dilger * in the same group, or nearby one. 1342e50e5129SAndreas Dilger */ 1343e50e5129SAndreas Dilger ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, 13449e1ba001STahsin Erdogan S_IFREG | 0600, NULL, inode->i_ino + 1, owner, 13451b917ed8STahsin Erdogan EXT4_EA_INODE_FL); 1346e50e5129SAndreas Dilger if (!IS_ERR(ea_inode)) { 1347e50e5129SAndreas Dilger ea_inode->i_op = &ext4_file_inode_operations; 1348e50e5129SAndreas Dilger ea_inode->i_fop = &ext4_file_operations; 1349e50e5129SAndreas Dilger ext4_set_aops(ea_inode); 135033d201e0STahsin Erdogan ext4_xattr_inode_set_class(ea_inode); 1351e50e5129SAndreas Dilger unlock_new_inode(ea_inode); 1352dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, 1); 1353dec214d0STahsin Erdogan ext4_xattr_inode_set_hash(ea_inode, hash); 1354dec214d0STahsin Erdogan err = ext4_mark_inode_dirty(handle, ea_inode); 1355dec214d0STahsin Erdogan if (!err) 1356bd3b963bSTahsin Erdogan err = ext4_inode_attach_jinode(ea_inode); 1357bd3b963bSTahsin Erdogan if (err) { 1358bd3b963bSTahsin Erdogan iput(ea_inode); 1359bd3b963bSTahsin Erdogan return ERR_PTR(err); 1360bd3b963bSTahsin Erdogan } 1361dec214d0STahsin Erdogan 1362dec214d0STahsin Erdogan /* 1363dec214d0STahsin Erdogan * Xattr inodes are shared therefore quota charging is performed 1364dec214d0STahsin Erdogan * at a higher level. 1365dec214d0STahsin Erdogan */ 1366dec214d0STahsin Erdogan dquot_free_inode(ea_inode); 1367dec214d0STahsin Erdogan dquot_drop(ea_inode); 1368dec214d0STahsin Erdogan inode_lock(ea_inode); 1369dec214d0STahsin Erdogan ea_inode->i_flags |= S_NOQUOTA; 1370dec214d0STahsin Erdogan inode_unlock(ea_inode); 1371e50e5129SAndreas Dilger } 1372e50e5129SAndreas Dilger 1373e50e5129SAndreas Dilger return ea_inode; 1374e50e5129SAndreas Dilger } 1375e50e5129SAndreas Dilger 1376dec214d0STahsin Erdogan static struct inode * 1377dec214d0STahsin Erdogan ext4_xattr_inode_cache_find(struct inode *inode, const void *value, 1378dec214d0STahsin Erdogan size_t value_len, u32 hash) 1379e50e5129SAndreas Dilger { 1380dec214d0STahsin Erdogan struct inode *ea_inode; 1381dec214d0STahsin Erdogan struct mb_cache_entry *ce; 1382dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 1383dec214d0STahsin Erdogan void *ea_data; 1384e50e5129SAndreas Dilger 1385dec214d0STahsin Erdogan ce = mb_cache_entry_find_first(ea_inode_cache, hash); 1386dec214d0STahsin Erdogan if (!ce) 1387dec214d0STahsin Erdogan return NULL; 1388e50e5129SAndreas Dilger 1389dec214d0STahsin Erdogan ea_data = ext4_kvmalloc(value_len, GFP_NOFS); 1390dec214d0STahsin Erdogan if (!ea_data) { 1391dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1392dec214d0STahsin Erdogan return NULL; 1393dec214d0STahsin Erdogan } 1394dec214d0STahsin Erdogan 1395dec214d0STahsin Erdogan while (ce) { 1396dec214d0STahsin Erdogan ea_inode = ext4_iget(inode->i_sb, ce->e_value); 1397dec214d0STahsin Erdogan if (!IS_ERR(ea_inode) && 1398dec214d0STahsin Erdogan !is_bad_inode(ea_inode) && 1399dec214d0STahsin Erdogan (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && 1400dec214d0STahsin Erdogan i_size_read(ea_inode) == value_len && 1401dec214d0STahsin Erdogan !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && 1402dec214d0STahsin Erdogan !ext4_xattr_inode_verify_hash(ea_inode, ea_data, 1403dec214d0STahsin Erdogan value_len) && 1404dec214d0STahsin Erdogan !memcmp(value, ea_data, value_len)) { 1405dec214d0STahsin Erdogan mb_cache_entry_touch(ea_inode_cache, ce); 1406dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1407dec214d0STahsin Erdogan kvfree(ea_data); 1408dec214d0STahsin Erdogan return ea_inode; 1409dec214d0STahsin Erdogan } 1410dec214d0STahsin Erdogan 1411dec214d0STahsin Erdogan if (!IS_ERR(ea_inode)) 1412e50e5129SAndreas Dilger iput(ea_inode); 1413dec214d0STahsin Erdogan ce = mb_cache_entry_find_next(ea_inode_cache, ce); 1414dec214d0STahsin Erdogan } 1415dec214d0STahsin Erdogan kvfree(ea_data); 1416dec214d0STahsin Erdogan return NULL; 1417e50e5129SAndreas Dilger } 1418e50e5129SAndreas Dilger 1419e50e5129SAndreas Dilger /* 1420e50e5129SAndreas Dilger * Add value of the EA in an inode. 1421e50e5129SAndreas Dilger */ 1422dec214d0STahsin Erdogan static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, 1423dec214d0STahsin Erdogan const void *value, size_t value_len, 1424dec214d0STahsin Erdogan struct inode **ret_inode) 1425e50e5129SAndreas Dilger { 1426e50e5129SAndreas Dilger struct inode *ea_inode; 1427dec214d0STahsin Erdogan u32 hash; 1428e50e5129SAndreas Dilger int err; 1429e50e5129SAndreas Dilger 1430dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); 1431dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); 1432dec214d0STahsin Erdogan if (ea_inode) { 1433dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1434dec214d0STahsin Erdogan if (err) { 1435dec214d0STahsin Erdogan iput(ea_inode); 1436dec214d0STahsin Erdogan return err; 1437dec214d0STahsin Erdogan } 1438dec214d0STahsin Erdogan 1439dec214d0STahsin Erdogan *ret_inode = ea_inode; 1440dec214d0STahsin Erdogan return 0; 1441dec214d0STahsin Erdogan } 1442dec214d0STahsin Erdogan 1443e50e5129SAndreas Dilger /* Create an inode for the EA value */ 1444dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_create(handle, inode, hash); 1445e50e5129SAndreas Dilger if (IS_ERR(ea_inode)) 1446e50e5129SAndreas Dilger return PTR_ERR(ea_inode); 1447e50e5129SAndreas Dilger 1448e50e5129SAndreas Dilger err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); 1449dec214d0STahsin Erdogan if (err) { 1450dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref(handle, ea_inode); 1451e50e5129SAndreas Dilger iput(ea_inode); 1452e50e5129SAndreas Dilger return err; 1453e50e5129SAndreas Dilger } 1454e50e5129SAndreas Dilger 1455dec214d0STahsin Erdogan mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, 1456dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 1457dec214d0STahsin Erdogan 1458dec214d0STahsin Erdogan *ret_inode = ea_inode; 1459dec214d0STahsin Erdogan return 0; 1460dec214d0STahsin Erdogan } 1461dec214d0STahsin Erdogan 1462*9c6e7853STahsin Erdogan /* 1463*9c6e7853STahsin Erdogan * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode 1464*9c6e7853STahsin Erdogan * feature is enabled. 1465*9c6e7853STahsin Erdogan */ 1466*9c6e7853STahsin Erdogan #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) 1467*9c6e7853STahsin Erdogan 1468e50e5129SAndreas Dilger static int ext4_xattr_set_entry(struct ext4_xattr_info *i, 1469e50e5129SAndreas Dilger struct ext4_xattr_search *s, 1470e50e5129SAndreas Dilger handle_t *handle, struct inode *inode) 1471ac27a0ecSDave Kleikamp { 1472617ba13bSMingming Cao struct ext4_xattr_entry *last; 1473dec214d0STahsin Erdogan struct ext4_xattr_entry *here = s->here; 1474dec214d0STahsin Erdogan size_t min_offs = s->end - s->base, name_len = strlen(i->name); 1475e50e5129SAndreas Dilger int in_inode = i->in_inode; 1476dec214d0STahsin Erdogan struct inode *old_ea_inode = NULL; 1477dec214d0STahsin Erdogan struct inode *new_ea_inode = NULL; 1478dec214d0STahsin Erdogan size_t old_size, new_size; 1479dec214d0STahsin Erdogan int ret; 1480dec214d0STahsin Erdogan 1481dec214d0STahsin Erdogan /* Space used by old and new values. */ 1482dec214d0STahsin Erdogan old_size = (!s->not_found && !here->e_value_inum) ? 1483dec214d0STahsin Erdogan EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; 1484dec214d0STahsin Erdogan new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; 1485dec214d0STahsin Erdogan 1486dec214d0STahsin Erdogan /* 1487dec214d0STahsin Erdogan * Optimization for the simple case when old and new values have the 1488dec214d0STahsin Erdogan * same padded sizes. Not applicable if external inodes are involved. 1489dec214d0STahsin Erdogan */ 1490dec214d0STahsin Erdogan if (new_size && new_size == old_size) { 1491dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1492dec214d0STahsin Erdogan void *val = s->base + offs; 1493dec214d0STahsin Erdogan 1494dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1495dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1496dec214d0STahsin Erdogan memset(val, 0, new_size); 1497dec214d0STahsin Erdogan } else { 1498dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1499dec214d0STahsin Erdogan /* Clear padding bytes. */ 1500dec214d0STahsin Erdogan memset(val + i->value_len, 0, new_size - i->value_len); 1501dec214d0STahsin Erdogan } 1502dec214d0STahsin Erdogan return 0; 1503dec214d0STahsin Erdogan } 1504e50e5129SAndreas Dilger 1505ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 1506ac27a0ecSDave Kleikamp last = s->first; 1507617ba13bSMingming Cao for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1508e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 1509ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 1510ac27a0ecSDave Kleikamp if (offs < min_offs) 1511ac27a0ecSDave Kleikamp min_offs = offs; 1512ac27a0ecSDave Kleikamp } 1513ac27a0ecSDave Kleikamp } 1514dec214d0STahsin Erdogan 1515dec214d0STahsin Erdogan /* Check whether we have enough space. */ 1516ac27a0ecSDave Kleikamp if (i->value) { 1517dec214d0STahsin Erdogan size_t free; 1518e50e5129SAndreas Dilger 1519dec214d0STahsin Erdogan free = min_offs - ((void *)last - s->base) - sizeof(__u32); 1520dec214d0STahsin Erdogan if (!s->not_found) 1521dec214d0STahsin Erdogan free += EXT4_XATTR_LEN(name_len) + old_size; 1522e50e5129SAndreas Dilger 1523dec214d0STahsin Erdogan if (free < EXT4_XATTR_LEN(name_len) + new_size) { 1524dec214d0STahsin Erdogan ret = -ENOSPC; 1525dec214d0STahsin Erdogan goto out; 1526dec214d0STahsin Erdogan } 1527*9c6e7853STahsin Erdogan 1528*9c6e7853STahsin Erdogan /* 1529*9c6e7853STahsin Erdogan * If storing the value in an external inode is an option, 1530*9c6e7853STahsin Erdogan * reserve space for xattr entries/names in the external 1531*9c6e7853STahsin Erdogan * attribute block so that a long value does not occupy the 1532*9c6e7853STahsin Erdogan * whole space and prevent futher entries being added. 1533*9c6e7853STahsin Erdogan */ 1534*9c6e7853STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && new_size && 1535*9c6e7853STahsin Erdogan (s->end - s->base) == i_blocksize(inode) && 1536*9c6e7853STahsin Erdogan (min_offs + old_size - new_size) < 1537*9c6e7853STahsin Erdogan EXT4_XATTR_BLOCK_RESERVE(inode)) { 1538*9c6e7853STahsin Erdogan ret = -ENOSPC; 1539*9c6e7853STahsin Erdogan goto out; 1540*9c6e7853STahsin Erdogan } 1541ac27a0ecSDave Kleikamp } 1542ac27a0ecSDave Kleikamp 1543dec214d0STahsin Erdogan /* 1544dec214d0STahsin Erdogan * Getting access to old and new ea inodes is subject to failures. 1545dec214d0STahsin Erdogan * Finish that work before doing any modifications to the xattr data. 1546dec214d0STahsin Erdogan */ 1547dec214d0STahsin Erdogan if (!s->not_found && here->e_value_inum) { 1548dec214d0STahsin Erdogan ret = ext4_xattr_inode_iget(inode, 1549dec214d0STahsin Erdogan le32_to_cpu(here->e_value_inum), 1550dec214d0STahsin Erdogan &old_ea_inode); 1551dec214d0STahsin Erdogan if (ret) { 1552dec214d0STahsin Erdogan old_ea_inode = NULL; 1553dec214d0STahsin Erdogan goto out; 1554bd9926e8STheodore Ts'o } 1555dec214d0STahsin Erdogan } 1556dec214d0STahsin Erdogan if (i->value && in_inode) { 1557dec214d0STahsin Erdogan WARN_ON_ONCE(!i->value_len); 1558dec214d0STahsin Erdogan 1559dec214d0STahsin Erdogan ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); 1560dec214d0STahsin Erdogan if (ret) 1561dec214d0STahsin Erdogan goto out; 1562dec214d0STahsin Erdogan 1563dec214d0STahsin Erdogan ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, 1564dec214d0STahsin Erdogan i->value_len, 1565dec214d0STahsin Erdogan &new_ea_inode); 1566dec214d0STahsin Erdogan if (ret) { 1567dec214d0STahsin Erdogan new_ea_inode = NULL; 1568dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, i->value_len); 1569dec214d0STahsin Erdogan goto out; 1570dec214d0STahsin Erdogan } 1571ac27a0ecSDave Kleikamp } 1572ac27a0ecSDave Kleikamp 1573dec214d0STahsin Erdogan if (old_ea_inode) { 1574dec214d0STahsin Erdogan /* We are ready to release ref count on the old_ea_inode. */ 1575dec214d0STahsin Erdogan ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); 1576dec214d0STahsin Erdogan if (ret) { 1577dec214d0STahsin Erdogan /* Release newly required ref count on new_ea_inode. */ 1578dec214d0STahsin Erdogan if (new_ea_inode) { 1579dec214d0STahsin Erdogan int err; 1580dec214d0STahsin Erdogan 1581dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, 1582dec214d0STahsin Erdogan new_ea_inode); 1583dec214d0STahsin Erdogan if (err) 1584dec214d0STahsin Erdogan ext4_warning_inode(new_ea_inode, 1585dec214d0STahsin Erdogan "dec ref new_ea_inode err=%d", 1586dec214d0STahsin Erdogan err); 1587dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 1588dec214d0STahsin Erdogan i->value_len); 1589dec214d0STahsin Erdogan } 1590dec214d0STahsin Erdogan goto out; 1591dec214d0STahsin Erdogan } 1592dec214d0STahsin Erdogan 1593dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 1594dec214d0STahsin Erdogan le32_to_cpu(here->e_value_size)); 1595dec214d0STahsin Erdogan } 1596dec214d0STahsin Erdogan 1597dec214d0STahsin Erdogan /* No failures allowed past this point. */ 1598dec214d0STahsin Erdogan 1599dec214d0STahsin Erdogan if (!s->not_found && here->e_value_offs) { 1600ac27a0ecSDave Kleikamp /* Remove the old value. */ 1601dec214d0STahsin Erdogan void *first_val = s->base + min_offs; 1602dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1603dec214d0STahsin Erdogan void *val = s->base + offs; 1604dec214d0STahsin Erdogan 1605dec214d0STahsin Erdogan memmove(first_val + old_size, first_val, val - first_val); 1606dec214d0STahsin Erdogan memset(first_val, 0, old_size); 1607dec214d0STahsin Erdogan min_offs += old_size; 1608ac27a0ecSDave Kleikamp 1609ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 1610ac27a0ecSDave Kleikamp last = s->first; 1611ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 1612ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 1613dec214d0STahsin Erdogan 1614e50e5129SAndreas Dilger if (!last->e_value_inum && 1615e50e5129SAndreas Dilger last->e_value_size && o < offs) 1616dec214d0STahsin Erdogan last->e_value_offs = cpu_to_le16(o + old_size); 1617617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 1618ac27a0ecSDave Kleikamp } 1619ac27a0ecSDave Kleikamp } 1620dec214d0STahsin Erdogan 1621ac27a0ecSDave Kleikamp if (!i->value) { 1622dec214d0STahsin Erdogan /* Remove old name. */ 1623617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 1624dec214d0STahsin Erdogan 1625ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 1626dec214d0STahsin Erdogan memmove(here, (void *)here + size, 1627dec214d0STahsin Erdogan (void *)last - (void *)here + sizeof(__u32)); 1628ac27a0ecSDave Kleikamp memset(last, 0, size); 1629dec214d0STahsin Erdogan } else if (s->not_found) { 1630dec214d0STahsin Erdogan /* Insert new name. */ 1631dec214d0STahsin Erdogan size_t size = EXT4_XATTR_LEN(name_len); 1632dec214d0STahsin Erdogan size_t rest = (void *)last - (void *)here + sizeof(__u32); 1633dec214d0STahsin Erdogan 1634dec214d0STahsin Erdogan memmove((void *)here + size, here, rest); 1635dec214d0STahsin Erdogan memset(here, 0, size); 1636dec214d0STahsin Erdogan here->e_name_index = i->name_index; 1637dec214d0STahsin Erdogan here->e_name_len = name_len; 1638dec214d0STahsin Erdogan memcpy(here->e_name, i->name, name_len); 1639dec214d0STahsin Erdogan } else { 1640dec214d0STahsin Erdogan /* This is an update, reset value info. */ 1641dec214d0STahsin Erdogan here->e_value_inum = 0; 1642dec214d0STahsin Erdogan here->e_value_offs = 0; 1643dec214d0STahsin Erdogan here->e_value_size = 0; 1644ac27a0ecSDave Kleikamp } 1645ac27a0ecSDave Kleikamp 1646ac27a0ecSDave Kleikamp if (i->value) { 1647dec214d0STahsin Erdogan /* Insert new value. */ 1648e50e5129SAndreas Dilger if (in_inode) { 1649dec214d0STahsin Erdogan here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); 1650e50e5129SAndreas Dilger } else if (i->value_len) { 1651dec214d0STahsin Erdogan void *val = s->base + min_offs - new_size; 1652e50e5129SAndreas Dilger 1653dec214d0STahsin Erdogan here->e_value_offs = cpu_to_le16(min_offs - new_size); 1654dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1655dec214d0STahsin Erdogan memset(val, 0, new_size); 1656dec214d0STahsin Erdogan } else { 1657dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1658dec214d0STahsin Erdogan /* Clear padding bytes. */ 1659dec214d0STahsin Erdogan memset(val + i->value_len, 0, 1660dec214d0STahsin Erdogan new_size - i->value_len); 1661dec214d0STahsin Erdogan } 1662dec214d0STahsin Erdogan } 1663dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1664dec214d0STahsin Erdogan } 1665dec214d0STahsin Erdogan ret = 0; 1666e50e5129SAndreas Dilger out: 1667dec214d0STahsin Erdogan iput(old_ea_inode); 1668dec214d0STahsin Erdogan iput(new_ea_inode); 1669dec214d0STahsin Erdogan return ret; 1670ac27a0ecSDave Kleikamp } 1671ac27a0ecSDave Kleikamp 1672617ba13bSMingming Cao struct ext4_xattr_block_find { 1673617ba13bSMingming Cao struct ext4_xattr_search s; 1674ac27a0ecSDave Kleikamp struct buffer_head *bh; 1675ac27a0ecSDave Kleikamp }; 1676ac27a0ecSDave Kleikamp 1677ac27a0ecSDave Kleikamp static int 1678617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 1679617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1680ac27a0ecSDave Kleikamp { 1681ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1682ac27a0ecSDave Kleikamp int error; 1683ac27a0ecSDave Kleikamp 1684ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 1685ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 1686ac27a0ecSDave Kleikamp 1687617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 1688ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 1689617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 1690ac27a0ecSDave Kleikamp error = -EIO; 1691ac27a0ecSDave Kleikamp if (!bs->bh) 1692ac27a0ecSDave Kleikamp goto cleanup; 1693ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 1694ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 1695ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 1696cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bs->bh)) { 169724676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 169824676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 16996a797d27SDarrick J. Wong error = -EFSCORRUPTED; 1700ac27a0ecSDave Kleikamp goto cleanup; 1701ac27a0ecSDave Kleikamp } 1702ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1703ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 1704ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 1705ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 1706ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 1707617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 17086ba644b9SEric Biggers i->name, 1); 1709ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1710ac27a0ecSDave Kleikamp goto cleanup; 1711ac27a0ecSDave Kleikamp bs->s.not_found = error; 1712ac27a0ecSDave Kleikamp } 1713ac27a0ecSDave Kleikamp error = 0; 1714ac27a0ecSDave Kleikamp 1715ac27a0ecSDave Kleikamp cleanup: 1716ac27a0ecSDave Kleikamp return error; 1717ac27a0ecSDave Kleikamp } 1718ac27a0ecSDave Kleikamp 1719ac27a0ecSDave Kleikamp static int 1720617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 1721617ba13bSMingming Cao struct ext4_xattr_info *i, 1722617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1723ac27a0ecSDave Kleikamp { 1724ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1725ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 1726b347e2bcSTahsin Erdogan struct ext4_xattr_search s_copy = bs->s; 1727b347e2bcSTahsin Erdogan struct ext4_xattr_search *s = &s_copy; 17287a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 17298a2bfdcbSMingming Cao int error = 0; 173047387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 1731dec214d0STahsin Erdogan struct inode *ea_inode = NULL; 1732dec214d0STahsin Erdogan size_t old_ea_inode_size = 0; 1733ac27a0ecSDave Kleikamp 1734617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 1735ac27a0ecSDave Kleikamp 1736ac27a0ecSDave Kleikamp if (s->base) { 17375d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 17388a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 17398a2bfdcbSMingming Cao if (error) 17408a2bfdcbSMingming Cao goto cleanup; 17418a2bfdcbSMingming Cao lock_buffer(bs->bh); 17428a2bfdcbSMingming Cao 1743ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 174482939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 174582939d79SJan Kara 174682939d79SJan Kara /* 174782939d79SJan Kara * This must happen under buffer lock for 174882939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 174982939d79SJan Kara * block 175082939d79SJan Kara */ 175147387409STahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, 175282939d79SJan Kara bs->bh->b_blocknr); 1753ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 1754e50e5129SAndreas Dilger error = ext4_xattr_set_entry(i, s, handle, inode); 1755ac27a0ecSDave Kleikamp if (!error) { 1756ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 1757617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), 1758ac27a0ecSDave Kleikamp s->here); 175947387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, 17609c191f70ST Makphaibulchoke bs->bh); 1761ac27a0ecSDave Kleikamp } 1762dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bs->bh); 1763ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 17646a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1765ac27a0ecSDave Kleikamp goto bad_block; 1766ac27a0ecSDave Kleikamp if (!error) 1767dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 17680390131bSFrank Mayhar inode, 1769ac27a0ecSDave Kleikamp bs->bh); 1770ac27a0ecSDave Kleikamp if (error) 1771ac27a0ecSDave Kleikamp goto cleanup; 1772ac27a0ecSDave Kleikamp goto inserted; 1773ac27a0ecSDave Kleikamp } else { 1774ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 1775ac27a0ecSDave Kleikamp 17768a2bfdcbSMingming Cao unlock_buffer(bs->bh); 1777ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 1778216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 1779ac27a0ecSDave Kleikamp error = -ENOMEM; 1780ac27a0ecSDave Kleikamp if (s->base == NULL) 1781ac27a0ecSDave Kleikamp goto cleanup; 1782ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 1783ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1784ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1785ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 1786ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 1787dec214d0STahsin Erdogan 1788dec214d0STahsin Erdogan /* 1789dec214d0STahsin Erdogan * If existing entry points to an xattr inode, we need 1790dec214d0STahsin Erdogan * to prevent ext4_xattr_set_entry() from decrementing 1791dec214d0STahsin Erdogan * ref count on it because the reference belongs to the 1792dec214d0STahsin Erdogan * original block. In this case, make the entry look 1793dec214d0STahsin Erdogan * like it has an empty value. 1794dec214d0STahsin Erdogan */ 1795dec214d0STahsin Erdogan if (!s->not_found && s->here->e_value_inum) { 1796dec214d0STahsin Erdogan /* 1797dec214d0STahsin Erdogan * Defer quota free call for previous inode 1798dec214d0STahsin Erdogan * until success is guaranteed. 1799dec214d0STahsin Erdogan */ 1800dec214d0STahsin Erdogan old_ea_inode_size = le32_to_cpu( 1801dec214d0STahsin Erdogan s->here->e_value_size); 1802dec214d0STahsin Erdogan s->here->e_value_inum = 0; 1803dec214d0STahsin Erdogan s->here->e_value_size = 0; 1804dec214d0STahsin Erdogan } 1805ac27a0ecSDave Kleikamp } 1806ac27a0ecSDave Kleikamp } else { 1807ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 1808216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 1809ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 1810ac27a0ecSDave Kleikamp error = -ENOMEM; 1811ac27a0ecSDave Kleikamp if (s->base == NULL) 1812ac27a0ecSDave Kleikamp goto cleanup; 1813617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 1814ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 1815ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1816ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1817ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 1818ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 1819ac27a0ecSDave Kleikamp } 1820ac27a0ecSDave Kleikamp 1821e50e5129SAndreas Dilger error = ext4_xattr_set_entry(i, s, handle, inode); 18226a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1823ac27a0ecSDave Kleikamp goto bad_block; 1824ac27a0ecSDave Kleikamp if (error) 1825ac27a0ecSDave Kleikamp goto cleanup; 1826dec214d0STahsin Erdogan 1827dec214d0STahsin Erdogan if (i->value && s->here->e_value_inum) { 1828dec214d0STahsin Erdogan unsigned int ea_ino; 1829dec214d0STahsin Erdogan 1830dec214d0STahsin Erdogan /* 1831dec214d0STahsin Erdogan * A ref count on ea_inode has been taken as part of the call to 1832dec214d0STahsin Erdogan * ext4_xattr_set_entry() above. We would like to drop this 1833dec214d0STahsin Erdogan * extra ref but we have to wait until the xattr block is 1834dec214d0STahsin Erdogan * initialized and has its own ref count on the ea_inode. 1835dec214d0STahsin Erdogan */ 1836dec214d0STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 1837dec214d0STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, &ea_inode); 1838dec214d0STahsin Erdogan if (error) { 1839dec214d0STahsin Erdogan ea_inode = NULL; 1840dec214d0STahsin Erdogan goto cleanup; 1841dec214d0STahsin Erdogan } 1842dec214d0STahsin Erdogan } 1843dec214d0STahsin Erdogan 1844ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 1845617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), s->here); 1846ac27a0ecSDave Kleikamp 1847ac27a0ecSDave Kleikamp inserted: 1848ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 184947387409STahsin Erdogan new_bh = ext4_xattr_block_cache_find(inode, header(s->base), 185047387409STahsin Erdogan &ce); 1851ac27a0ecSDave Kleikamp if (new_bh) { 1852ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 1853ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 1854ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 1855ac27a0ecSDave Kleikamp else { 18566048c64bSAndreas Gruenbacher u32 ref; 18576048c64bSAndreas Gruenbacher 1858b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 1859b8cb5a54STahsin Erdogan 1860ac27a0ecSDave Kleikamp /* The old block is released after updating 1861ac27a0ecSDave Kleikamp the inode. */ 18621231b3a1SLukas Czerner error = dquot_alloc_block(inode, 18631231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 18645dd4056dSChristoph Hellwig if (error) 1865ac27a0ecSDave Kleikamp goto cleanup; 18665d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 1867617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 1868ac27a0ecSDave Kleikamp new_bh); 1869ac27a0ecSDave Kleikamp if (error) 1870ac27a0ecSDave Kleikamp goto cleanup_dquot; 1871ac27a0ecSDave Kleikamp lock_buffer(new_bh); 187282939d79SJan Kara /* 187382939d79SJan Kara * We have to be careful about races with 18746048c64bSAndreas Gruenbacher * freeing, rehashing or adding references to 18756048c64bSAndreas Gruenbacher * xattr block. Once we hold buffer lock xattr 18766048c64bSAndreas Gruenbacher * block's state is stable so we can check 18776048c64bSAndreas Gruenbacher * whether the block got freed / rehashed or 18786048c64bSAndreas Gruenbacher * not. Since we unhash mbcache entry under 18796048c64bSAndreas Gruenbacher * buffer lock when freeing / rehashing xattr 18806048c64bSAndreas Gruenbacher * block, checking whether entry is still 18816048c64bSAndreas Gruenbacher * hashed is reliable. Same rules hold for 18826048c64bSAndreas Gruenbacher * e_reusable handling. 188382939d79SJan Kara */ 18846048c64bSAndreas Gruenbacher if (hlist_bl_unhashed(&ce->e_hash_list) || 18856048c64bSAndreas Gruenbacher !ce->e_reusable) { 188682939d79SJan Kara /* 188782939d79SJan Kara * Undo everything and check mbcache 188882939d79SJan Kara * again. 188982939d79SJan Kara */ 189082939d79SJan Kara unlock_buffer(new_bh); 189182939d79SJan Kara dquot_free_block(inode, 189282939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 189382939d79SJan Kara 1)); 189482939d79SJan Kara brelse(new_bh); 189547387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 189682939d79SJan Kara ce = NULL; 189782939d79SJan Kara new_bh = NULL; 189882939d79SJan Kara goto inserted; 189982939d79SJan Kara } 19006048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 19016048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 19026048c64bSAndreas Gruenbacher if (ref >= EXT4_XATTR_REFCOUNT_MAX) 19036048c64bSAndreas Gruenbacher ce->e_reusable = 0; 1904ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 19056048c64bSAndreas Gruenbacher ref); 1906dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 1907ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 1908dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 19090390131bSFrank Mayhar inode, 1910ac27a0ecSDave Kleikamp new_bh); 1911ac27a0ecSDave Kleikamp if (error) 1912ac27a0ecSDave Kleikamp goto cleanup_dquot; 1913ac27a0ecSDave Kleikamp } 191447387409STahsin Erdogan mb_cache_entry_touch(ea_block_cache, ce); 191547387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 1916ac27a0ecSDave Kleikamp ce = NULL; 1917ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 1918ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 1919ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 1920ac27a0ecSDave Kleikamp new_bh = bs->bh; 1921ac27a0ecSDave Kleikamp get_bh(new_bh); 1922ac27a0ecSDave Kleikamp } else { 1923ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 1924fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 1925fb0a387dSEric Sandeen 1926b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 1927b8cb5a54STahsin Erdogan 1928fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 1929d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 1930fb0a387dSEric Sandeen 1931fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 193212e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 1933fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 1934fb0a387dSEric Sandeen 193555f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 193655f020dbSAllison Henderson NULL, &error); 1937ac27a0ecSDave Kleikamp if (error) 1938ac27a0ecSDave Kleikamp goto cleanup; 1939fb0a387dSEric Sandeen 194012e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 1941fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 1942fb0a387dSEric Sandeen 1943ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 1944ace36ad4SJoe Perches (unsigned long long)block); 1945ac27a0ecSDave Kleikamp 1946ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 1947aebf0243SWang Shilong if (unlikely(!new_bh)) { 1948860d21e2STheodore Ts'o error = -ENOMEM; 1949ac27a0ecSDave Kleikamp getblk_failed: 19507dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 1951e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 1952ac27a0ecSDave Kleikamp goto cleanup; 1953ac27a0ecSDave Kleikamp } 1954dec214d0STahsin Erdogan error = ext4_xattr_inode_inc_ref_all(handle, inode, 1955dec214d0STahsin Erdogan ENTRY(header(s->base)+1)); 1956dec214d0STahsin Erdogan if (error) 1957dec214d0STahsin Erdogan goto getblk_failed; 1958dec214d0STahsin Erdogan if (ea_inode) { 1959dec214d0STahsin Erdogan /* Drop the extra ref on ea_inode. */ 1960dec214d0STahsin Erdogan error = ext4_xattr_inode_dec_ref(handle, 1961dec214d0STahsin Erdogan ea_inode); 1962dec214d0STahsin Erdogan if (error) 1963dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 1964dec214d0STahsin Erdogan "dec ref error=%d", 1965dec214d0STahsin Erdogan error); 1966dec214d0STahsin Erdogan iput(ea_inode); 1967dec214d0STahsin Erdogan ea_inode = NULL; 1968dec214d0STahsin Erdogan } 1969dec214d0STahsin Erdogan 1970ac27a0ecSDave Kleikamp lock_buffer(new_bh); 1971617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 1972ac27a0ecSDave Kleikamp if (error) { 1973ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 1974860d21e2STheodore Ts'o error = -EIO; 1975ac27a0ecSDave Kleikamp goto getblk_failed; 1976ac27a0ecSDave Kleikamp } 1977ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 1978dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 1979ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 1980ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 198147387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, new_bh); 1982dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, 1983dac7a4b4STheodore Ts'o new_bh); 1984ac27a0ecSDave Kleikamp if (error) 1985ac27a0ecSDave Kleikamp goto cleanup; 1986ac27a0ecSDave Kleikamp } 1987ac27a0ecSDave Kleikamp } 1988ac27a0ecSDave Kleikamp 1989dec214d0STahsin Erdogan if (old_ea_inode_size) 1990dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, old_ea_inode_size); 1991dec214d0STahsin Erdogan 1992ac27a0ecSDave Kleikamp /* Update the inode. */ 1993617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 1994ac27a0ecSDave Kleikamp 1995ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 1996dec214d0STahsin Erdogan if (bs->bh && bs->bh != new_bh) { 1997dec214d0STahsin Erdogan struct ext4_xattr_inode_array *ea_inode_array = NULL; 1998dec214d0STahsin Erdogan 1999dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bs->bh, 2000dec214d0STahsin Erdogan &ea_inode_array, 2001dec214d0STahsin Erdogan 0 /* extra_credits */); 2002dec214d0STahsin Erdogan ext4_xattr_inode_array_free(ea_inode_array); 2003dec214d0STahsin Erdogan } 2004ac27a0ecSDave Kleikamp error = 0; 2005ac27a0ecSDave Kleikamp 2006ac27a0ecSDave Kleikamp cleanup: 2007dec214d0STahsin Erdogan if (ea_inode) { 2008dec214d0STahsin Erdogan int error2; 2009dec214d0STahsin Erdogan 2010dec214d0STahsin Erdogan error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); 2011dec214d0STahsin Erdogan if (error2) 2012dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "dec ref error=%d", 2013dec214d0STahsin Erdogan error2); 2014dec214d0STahsin Erdogan 2015dec214d0STahsin Erdogan /* If there was an error, revert the quota charge. */ 2016dec214d0STahsin Erdogan if (error) 2017dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 2018dec214d0STahsin Erdogan i_size_read(ea_inode)); 2019dec214d0STahsin Erdogan iput(ea_inode); 2020dec214d0STahsin Erdogan } 2021ac27a0ecSDave Kleikamp if (ce) 202247387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2023ac27a0ecSDave Kleikamp brelse(new_bh); 2024ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 2025ac27a0ecSDave Kleikamp kfree(s->base); 2026ac27a0ecSDave Kleikamp 2027ac27a0ecSDave Kleikamp return error; 2028ac27a0ecSDave Kleikamp 2029ac27a0ecSDave Kleikamp cleanup_dquot: 20301231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 2031ac27a0ecSDave Kleikamp goto cleanup; 2032ac27a0ecSDave Kleikamp 2033ac27a0ecSDave Kleikamp bad_block: 203424676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 203524676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2036ac27a0ecSDave Kleikamp goto cleanup; 2037ac27a0ecSDave Kleikamp 2038ac27a0ecSDave Kleikamp #undef header 2039ac27a0ecSDave Kleikamp } 2040ac27a0ecSDave Kleikamp 2041879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 2042617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2043ac27a0ecSDave Kleikamp { 2044617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2045617ba13bSMingming Cao struct ext4_inode *raw_inode; 2046ac27a0ecSDave Kleikamp int error; 2047ac27a0ecSDave Kleikamp 2048617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 2049ac27a0ecSDave Kleikamp return 0; 2050617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 2051ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 2052ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 2053ac27a0ecSDave Kleikamp is->s.here = is->s.first; 2054617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 205519f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 20569e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 2057ac27a0ecSDave Kleikamp if (error) 2058ac27a0ecSDave Kleikamp return error; 2059ac27a0ecSDave Kleikamp /* Find the named attribute. */ 2060617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 20616ba644b9SEric Biggers i->name, 0); 2062ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 2063ac27a0ecSDave Kleikamp return error; 2064ac27a0ecSDave Kleikamp is->s.not_found = error; 2065ac27a0ecSDave Kleikamp } 2066ac27a0ecSDave Kleikamp return 0; 2067ac27a0ecSDave Kleikamp } 2068ac27a0ecSDave Kleikamp 20690d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 20700d812f77STao Ma struct ext4_xattr_info *i, 20710d812f77STao Ma struct ext4_xattr_ibody_find *is) 20720d812f77STao Ma { 20730d812f77STao Ma struct ext4_xattr_ibody_header *header; 20740d812f77STao Ma struct ext4_xattr_search *s = &is->s; 20750d812f77STao Ma int error; 20760d812f77STao Ma 20770d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 20780d812f77STao Ma return -ENOSPC; 2079e50e5129SAndreas Dilger error = ext4_xattr_set_entry(i, s, handle, inode); 20800d812f77STao Ma if (error) { 20810d812f77STao Ma if (error == -ENOSPC && 20820d812f77STao Ma ext4_has_inline_data(inode)) { 20830d812f77STao Ma error = ext4_try_to_evict_inline_data(handle, inode, 20840d812f77STao Ma EXT4_XATTR_LEN(strlen(i->name) + 20850d812f77STao Ma EXT4_XATTR_SIZE(i->value_len))); 20860d812f77STao Ma if (error) 20870d812f77STao Ma return error; 20880d812f77STao Ma error = ext4_xattr_ibody_find(inode, i, is); 20890d812f77STao Ma if (error) 20900d812f77STao Ma return error; 2091e50e5129SAndreas Dilger error = ext4_xattr_set_entry(i, s, handle, inode); 20920d812f77STao Ma } 20930d812f77STao Ma if (error) 20940d812f77STao Ma return error; 20950d812f77STao Ma } 20960d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 20970d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 20980d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 20990d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 21000d812f77STao Ma } else { 21010d812f77STao Ma header->h_magic = cpu_to_le32(0); 21020d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 21030d812f77STao Ma } 21040d812f77STao Ma return 0; 21050d812f77STao Ma } 21060d812f77STao Ma 2107e50e5129SAndreas Dilger static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 2108617ba13bSMingming Cao struct ext4_xattr_info *i, 2109617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2110ac27a0ecSDave Kleikamp { 2111617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2112617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 2113ac27a0ecSDave Kleikamp int error; 2114ac27a0ecSDave Kleikamp 2115617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 2116ac27a0ecSDave Kleikamp return -ENOSPC; 2117e50e5129SAndreas Dilger error = ext4_xattr_set_entry(i, s, handle, inode); 2118ac27a0ecSDave Kleikamp if (error) 2119ac27a0ecSDave Kleikamp return error; 2120617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 2121ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 2122617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 212319f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 2124ac27a0ecSDave Kleikamp } else { 2125ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 212619f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 2127ac27a0ecSDave Kleikamp } 2128ac27a0ecSDave Kleikamp return 0; 2129ac27a0ecSDave Kleikamp } 2130ac27a0ecSDave Kleikamp 21313fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 21323fd16462SJan Kara struct ext4_xattr_info *i) 21333fd16462SJan Kara { 21343fd16462SJan Kara void *value; 21353fd16462SJan Kara 21360bd454c0STahsin Erdogan /* When e_value_inum is set the value is stored externally. */ 21370bd454c0STahsin Erdogan if (s->here->e_value_inum) 21380bd454c0STahsin Erdogan return 0; 21393fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 21403fd16462SJan Kara return 0; 21413fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 21423fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 21433fd16462SJan Kara } 21443fd16462SJan Kara 2145dec214d0STahsin Erdogan static struct buffer_head *ext4_xattr_get_block(struct inode *inode) 2146dec214d0STahsin Erdogan { 2147dec214d0STahsin Erdogan struct buffer_head *bh; 2148dec214d0STahsin Erdogan int error; 2149dec214d0STahsin Erdogan 2150dec214d0STahsin Erdogan if (!EXT4_I(inode)->i_file_acl) 2151dec214d0STahsin Erdogan return NULL; 2152dec214d0STahsin Erdogan bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 2153dec214d0STahsin Erdogan if (!bh) 2154dec214d0STahsin Erdogan return ERR_PTR(-EIO); 2155dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2156dec214d0STahsin Erdogan if (error) 2157dec214d0STahsin Erdogan return ERR_PTR(error); 2158dec214d0STahsin Erdogan return bh; 2159dec214d0STahsin Erdogan } 2160dec214d0STahsin Erdogan 2161ac27a0ecSDave Kleikamp /* 2162617ba13bSMingming Cao * ext4_xattr_set_handle() 2163ac27a0ecSDave Kleikamp * 21646e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 2165ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 2166ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 2167ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 2168ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 2169ac27a0ecSDave Kleikamp * previous to the call, respectively. 2170ac27a0ecSDave Kleikamp * 2171ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2172ac27a0ecSDave Kleikamp */ 2173ac27a0ecSDave Kleikamp int 2174617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 2175ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 2176ac27a0ecSDave Kleikamp int flags) 2177ac27a0ecSDave Kleikamp { 2178617ba13bSMingming Cao struct ext4_xattr_info i = { 2179ac27a0ecSDave Kleikamp .name_index = name_index, 2180ac27a0ecSDave Kleikamp .name = name, 2181ac27a0ecSDave Kleikamp .value = value, 2182ac27a0ecSDave Kleikamp .value_len = value_len, 2183e50e5129SAndreas Dilger .in_inode = 0, 2184ac27a0ecSDave Kleikamp }; 2185617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 2186ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2187ac27a0ecSDave Kleikamp }; 2188617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 2189ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2190ac27a0ecSDave Kleikamp }; 2191c755e251STheodore Ts'o int no_expand; 2192ac27a0ecSDave Kleikamp int error; 2193ac27a0ecSDave Kleikamp 2194ac27a0ecSDave Kleikamp if (!name) 2195ac27a0ecSDave Kleikamp return -EINVAL; 2196ac27a0ecSDave Kleikamp if (strlen(name) > 255) 2197ac27a0ecSDave Kleikamp return -ERANGE; 2198b8cb5a54STahsin Erdogan 2199c755e251STheodore Ts'o ext4_write_lock_xattr(inode, &no_expand); 22004d20c685SKalpak Shah 2201c1a5d5f6STahsin Erdogan /* Check journal credits under write lock. */ 2202c1a5d5f6STahsin Erdogan if (ext4_handle_valid(handle)) { 2203dec214d0STahsin Erdogan struct buffer_head *bh; 2204c1a5d5f6STahsin Erdogan int credits; 2205c1a5d5f6STahsin Erdogan 2206dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2207dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2208dec214d0STahsin Erdogan error = PTR_ERR(bh); 2209dec214d0STahsin Erdogan goto cleanup; 2210dec214d0STahsin Erdogan } 2211dec214d0STahsin Erdogan 2212dec214d0STahsin Erdogan credits = __ext4_xattr_set_credits(inode, bh, value_len); 2213dec214d0STahsin Erdogan brelse(bh); 2214dec214d0STahsin Erdogan 2215c1a5d5f6STahsin Erdogan if (!ext4_handle_has_enough_credits(handle, credits)) { 2216c1a5d5f6STahsin Erdogan error = -ENOSPC; 2217c1a5d5f6STahsin Erdogan goto cleanup; 2218c1a5d5f6STahsin Erdogan } 2219c1a5d5f6STahsin Erdogan } 2220c1a5d5f6STahsin Erdogan 222166543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 222286ebfd08SEric Sandeen if (error) 222386ebfd08SEric Sandeen goto cleanup; 222486ebfd08SEric Sandeen 222519f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 2226617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 2227617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 222819f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 2229ac27a0ecSDave Kleikamp } 2230ac27a0ecSDave Kleikamp 2231617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 2232ac27a0ecSDave Kleikamp if (error) 2233ac27a0ecSDave Kleikamp goto cleanup; 2234ac27a0ecSDave Kleikamp if (is.s.not_found) 2235617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 2236ac27a0ecSDave Kleikamp if (error) 2237ac27a0ecSDave Kleikamp goto cleanup; 2238ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 2239ac27a0ecSDave Kleikamp error = -ENODATA; 2240ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 2241ac27a0ecSDave Kleikamp goto cleanup; 2242ac27a0ecSDave Kleikamp error = 0; 2243ac27a0ecSDave Kleikamp if (!value) 2244ac27a0ecSDave Kleikamp goto cleanup; 2245ac27a0ecSDave Kleikamp } else { 2246ac27a0ecSDave Kleikamp error = -EEXIST; 2247ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 2248ac27a0ecSDave Kleikamp goto cleanup; 2249ac27a0ecSDave Kleikamp } 2250dec214d0STahsin Erdogan 2251ac27a0ecSDave Kleikamp if (!value) { 2252ac27a0ecSDave Kleikamp if (!is.s.not_found) 2253e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2254ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 2255617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2256ac27a0ecSDave Kleikamp } else { 22573fd16462SJan Kara error = 0; 22583fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 22593fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 22603fd16462SJan Kara goto cleanup; 22613fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 22623fd16462SJan Kara goto cleanup; 22633fd16462SJan Kara 2264b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2265b347e2bcSTahsin Erdogan (EXT4_XATTR_SIZE(i.value_len) > 2266b347e2bcSTahsin Erdogan EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) 2267b347e2bcSTahsin Erdogan i.in_inode = 1; 2268b347e2bcSTahsin Erdogan retry_inode: 2269e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2270ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 2271ac27a0ecSDave Kleikamp i.value = NULL; 2272617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2273ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 22747e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 22757e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 22767e01c8e5STiger Yang if (error) 22777e01c8e5STiger Yang goto cleanup; 22787e01c8e5STiger Yang } 2279617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2280b347e2bcSTahsin Erdogan if (!error && !is.s.not_found) { 2281ac27a0ecSDave Kleikamp i.value = NULL; 2282e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, 2283e50e5129SAndreas Dilger &is); 2284b347e2bcSTahsin Erdogan } else if (error == -ENOSPC) { 2285b347e2bcSTahsin Erdogan /* 2286b347e2bcSTahsin Erdogan * Xattr does not fit in the block, store at 2287b347e2bcSTahsin Erdogan * external inode if possible. 2288b347e2bcSTahsin Erdogan */ 2289b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2290b347e2bcSTahsin Erdogan !i.in_inode) { 2291b347e2bcSTahsin Erdogan i.in_inode = 1; 2292b347e2bcSTahsin Erdogan goto retry_inode; 2293b347e2bcSTahsin Erdogan } 2294ac27a0ecSDave Kleikamp } 2295ac27a0ecSDave Kleikamp } 2296ac27a0ecSDave Kleikamp } 2297ac27a0ecSDave Kleikamp if (!error) { 2298617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 2299eeca7ea1SDeepa Dinamani inode->i_ctime = current_time(inode); 23006dd4ee7cSKalpak Shah if (!value) 2301c755e251STheodore Ts'o no_expand = 0; 2302617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 2303ac27a0ecSDave Kleikamp /* 2304617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 2305ac27a0ecSDave Kleikamp * error != 0. 2306ac27a0ecSDave Kleikamp */ 2307ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 2308ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 23090390131bSFrank Mayhar ext4_handle_sync(handle); 2310ac27a0ecSDave Kleikamp } 2311ac27a0ecSDave Kleikamp 2312ac27a0ecSDave Kleikamp cleanup: 2313ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 2314ac27a0ecSDave Kleikamp brelse(bs.bh); 2315c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 2316ac27a0ecSDave Kleikamp return error; 2317ac27a0ecSDave Kleikamp } 2318ac27a0ecSDave Kleikamp 2319dec214d0STahsin Erdogan int ext4_xattr_set_credits(struct inode *inode, size_t value_len, int *credits) 2320c1a5d5f6STahsin Erdogan { 2321dec214d0STahsin Erdogan struct buffer_head *bh; 2322dec214d0STahsin Erdogan int err; 2323c1a5d5f6STahsin Erdogan 2324dec214d0STahsin Erdogan *credits = 0; 2325dec214d0STahsin Erdogan 2326dec214d0STahsin Erdogan if (!EXT4_SB(inode->i_sb)->s_journal) 2327c1a5d5f6STahsin Erdogan return 0; 2328c1a5d5f6STahsin Erdogan 2329dec214d0STahsin Erdogan down_read(&EXT4_I(inode)->xattr_sem); 2330c1a5d5f6STahsin Erdogan 2331dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2332dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2333dec214d0STahsin Erdogan err = PTR_ERR(bh); 2334dec214d0STahsin Erdogan } else { 2335dec214d0STahsin Erdogan *credits = __ext4_xattr_set_credits(inode, bh, value_len); 2336dec214d0STahsin Erdogan brelse(bh); 2337dec214d0STahsin Erdogan err = 0; 2338c1a5d5f6STahsin Erdogan } 2339dec214d0STahsin Erdogan 2340dec214d0STahsin Erdogan up_read(&EXT4_I(inode)->xattr_sem); 2341dec214d0STahsin Erdogan return err; 2342c1a5d5f6STahsin Erdogan } 2343c1a5d5f6STahsin Erdogan 2344ac27a0ecSDave Kleikamp /* 2345617ba13bSMingming Cao * ext4_xattr_set() 2346ac27a0ecSDave Kleikamp * 2347617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 2348ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 2349ac27a0ecSDave Kleikamp * 2350ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2351ac27a0ecSDave Kleikamp */ 2352ac27a0ecSDave Kleikamp int 2353617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 2354ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 2355ac27a0ecSDave Kleikamp { 2356ac27a0ecSDave Kleikamp handle_t *handle; 2357e50e5129SAndreas Dilger struct super_block *sb = inode->i_sb; 2358ac27a0ecSDave Kleikamp int error, retries = 0; 2359c1a5d5f6STahsin Erdogan int credits; 2360ac27a0ecSDave Kleikamp 2361b8cb5a54STahsin Erdogan error = dquot_initialize(inode); 2362b8cb5a54STahsin Erdogan if (error) 2363b8cb5a54STahsin Erdogan return error; 2364e50e5129SAndreas Dilger 2365ac27a0ecSDave Kleikamp retry: 2366dec214d0STahsin Erdogan error = ext4_xattr_set_credits(inode, value_len, &credits); 2367dec214d0STahsin Erdogan if (error) 2368dec214d0STahsin Erdogan return error; 2369dec214d0STahsin Erdogan 23709924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 2371ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 2372ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 2373ac27a0ecSDave Kleikamp } else { 2374ac27a0ecSDave Kleikamp int error2; 2375ac27a0ecSDave Kleikamp 2376617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 2377ac27a0ecSDave Kleikamp value, value_len, flags); 2378617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 2379ac27a0ecSDave Kleikamp if (error == -ENOSPC && 2380e50e5129SAndreas Dilger ext4_should_retry_alloc(sb, &retries)) 2381ac27a0ecSDave Kleikamp goto retry; 2382ac27a0ecSDave Kleikamp if (error == 0) 2383ac27a0ecSDave Kleikamp error = error2; 2384ac27a0ecSDave Kleikamp } 2385ac27a0ecSDave Kleikamp 2386ac27a0ecSDave Kleikamp return error; 2387ac27a0ecSDave Kleikamp } 2388ac27a0ecSDave Kleikamp 2389ac27a0ecSDave Kleikamp /* 23906dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 23916dd4ee7cSKalpak Shah * i_extra_isize. 23926dd4ee7cSKalpak Shah */ 23936dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 23946dd4ee7cSKalpak Shah int value_offs_shift, void *to, 239594405713SJan Kara void *from, size_t n) 23966dd4ee7cSKalpak Shah { 23976dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 23986dd4ee7cSKalpak Shah int new_offs; 23996dd4ee7cSKalpak Shah 240094405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 240194405713SJan Kara BUG_ON(value_offs_shift > 0); 240294405713SJan Kara 24036dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 24046dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 2405e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 24066dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 24076dd4ee7cSKalpak Shah value_offs_shift; 24086dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 24096dd4ee7cSKalpak Shah } 24106dd4ee7cSKalpak Shah } 24116dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 24126dd4ee7cSKalpak Shah memmove(to, from, n); 24136dd4ee7cSKalpak Shah } 24146dd4ee7cSKalpak Shah 24156dd4ee7cSKalpak Shah /* 24163f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 24173f2571c1SJan Kara */ 24183f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 24193f2571c1SJan Kara struct ext4_inode *raw_inode, 24203f2571c1SJan Kara struct ext4_xattr_entry *entry) 24213f2571c1SJan Kara { 24223f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 24233f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 24243f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 2425f6109100STahsin Erdogan size_t value_size = le32_to_cpu(entry->e_value_size); 24263f2571c1SJan Kara struct ext4_xattr_info i = { 24273f2571c1SJan Kara .value = NULL, 24283f2571c1SJan Kara .value_len = 0, 24293f2571c1SJan Kara .name_index = entry->e_name_index, 2430f6109100STahsin Erdogan .in_inode = !!entry->e_value_inum, 24313f2571c1SJan Kara }; 24323f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 24333f2571c1SJan Kara int error; 24343f2571c1SJan Kara 24353f2571c1SJan Kara is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 24363f2571c1SJan Kara bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 24373f2571c1SJan Kara buffer = kmalloc(value_size, GFP_NOFS); 24383f2571c1SJan Kara b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 24393f2571c1SJan Kara if (!is || !bs || !buffer || !b_entry_name) { 24403f2571c1SJan Kara error = -ENOMEM; 24413f2571c1SJan Kara goto out; 24423f2571c1SJan Kara } 24433f2571c1SJan Kara 24443f2571c1SJan Kara is->s.not_found = -ENODATA; 24453f2571c1SJan Kara bs->s.not_found = -ENODATA; 24463f2571c1SJan Kara is->iloc.bh = NULL; 24473f2571c1SJan Kara bs->bh = NULL; 24483f2571c1SJan Kara 24493f2571c1SJan Kara /* Save the entry name and the entry value */ 2450f6109100STahsin Erdogan if (entry->e_value_inum) { 2451f6109100STahsin Erdogan error = ext4_xattr_inode_get(inode, 2452f6109100STahsin Erdogan le32_to_cpu(entry->e_value_inum), 2453f6109100STahsin Erdogan buffer, value_size); 2454f6109100STahsin Erdogan if (error) 2455f6109100STahsin Erdogan goto out; 2456f6109100STahsin Erdogan } else { 2457f6109100STahsin Erdogan size_t value_offs = le16_to_cpu(entry->e_value_offs); 24583f2571c1SJan Kara memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); 2459f6109100STahsin Erdogan } 2460f6109100STahsin Erdogan 24613f2571c1SJan Kara memcpy(b_entry_name, entry->e_name, entry->e_name_len); 24623f2571c1SJan Kara b_entry_name[entry->e_name_len] = '\0'; 24633f2571c1SJan Kara i.name = b_entry_name; 24643f2571c1SJan Kara 24653f2571c1SJan Kara error = ext4_get_inode_loc(inode, &is->iloc); 24663f2571c1SJan Kara if (error) 24673f2571c1SJan Kara goto out; 24683f2571c1SJan Kara 24693f2571c1SJan Kara error = ext4_xattr_ibody_find(inode, &i, is); 24703f2571c1SJan Kara if (error) 24713f2571c1SJan Kara goto out; 24723f2571c1SJan Kara 24733f2571c1SJan Kara /* Remove the chosen entry from the inode */ 2474e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, is); 24753f2571c1SJan Kara if (error) 24763f2571c1SJan Kara goto out; 24773f2571c1SJan Kara 24783f2571c1SJan Kara i.value = buffer; 24793f2571c1SJan Kara i.value_len = value_size; 24803f2571c1SJan Kara error = ext4_xattr_block_find(inode, &i, bs); 24813f2571c1SJan Kara if (error) 24823f2571c1SJan Kara goto out; 24833f2571c1SJan Kara 24843f2571c1SJan Kara /* Add entry which was removed from the inode into the block */ 24853f2571c1SJan Kara error = ext4_xattr_block_set(handle, inode, &i, bs); 24863f2571c1SJan Kara if (error) 24873f2571c1SJan Kara goto out; 24883f2571c1SJan Kara error = 0; 24893f2571c1SJan Kara out: 24903f2571c1SJan Kara kfree(b_entry_name); 24913f2571c1SJan Kara kfree(buffer); 24923f2571c1SJan Kara if (is) 24933f2571c1SJan Kara brelse(is->iloc.bh); 24943f2571c1SJan Kara kfree(is); 24953f2571c1SJan Kara kfree(bs); 24963f2571c1SJan Kara 24973f2571c1SJan Kara return error; 24983f2571c1SJan Kara } 24993f2571c1SJan Kara 2500dfa2064bSJan Kara static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, 2501dfa2064bSJan Kara struct ext4_inode *raw_inode, 2502dfa2064bSJan Kara int isize_diff, size_t ifree, 2503dfa2064bSJan Kara size_t bfree, int *total_ino) 2504dfa2064bSJan Kara { 2505dfa2064bSJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 2506dfa2064bSJan Kara struct ext4_xattr_entry *small_entry; 2507dfa2064bSJan Kara struct ext4_xattr_entry *entry; 2508dfa2064bSJan Kara struct ext4_xattr_entry *last; 2509dfa2064bSJan Kara unsigned int entry_size; /* EA entry size */ 2510dfa2064bSJan Kara unsigned int total_size; /* EA entry size + value size */ 2511dfa2064bSJan Kara unsigned int min_total_size; 2512dfa2064bSJan Kara int error; 2513dfa2064bSJan Kara 2514dfa2064bSJan Kara while (isize_diff > ifree) { 2515dfa2064bSJan Kara entry = NULL; 2516dfa2064bSJan Kara small_entry = NULL; 2517dfa2064bSJan Kara min_total_size = ~0U; 2518dfa2064bSJan Kara last = IFIRST(header); 2519dfa2064bSJan Kara /* Find the entry best suited to be pushed into EA block */ 2520dfa2064bSJan Kara for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 25219bb21cedSTahsin Erdogan total_size = EXT4_XATTR_LEN(last->e_name_len); 25229bb21cedSTahsin Erdogan if (!last->e_value_inum) 25239bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 25249bb21cedSTahsin Erdogan le32_to_cpu(last->e_value_size)); 2525dfa2064bSJan Kara if (total_size <= bfree && 2526dfa2064bSJan Kara total_size < min_total_size) { 2527dfa2064bSJan Kara if (total_size + ifree < isize_diff) { 2528dfa2064bSJan Kara small_entry = last; 2529dfa2064bSJan Kara } else { 2530dfa2064bSJan Kara entry = last; 2531dfa2064bSJan Kara min_total_size = total_size; 2532dfa2064bSJan Kara } 2533dfa2064bSJan Kara } 2534dfa2064bSJan Kara } 2535dfa2064bSJan Kara 2536dfa2064bSJan Kara if (entry == NULL) { 2537dfa2064bSJan Kara if (small_entry == NULL) 2538dfa2064bSJan Kara return -ENOSPC; 2539dfa2064bSJan Kara entry = small_entry; 2540dfa2064bSJan Kara } 2541dfa2064bSJan Kara 2542dfa2064bSJan Kara entry_size = EXT4_XATTR_LEN(entry->e_name_len); 25439bb21cedSTahsin Erdogan total_size = entry_size; 25449bb21cedSTahsin Erdogan if (!entry->e_value_inum) 25459bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 25469bb21cedSTahsin Erdogan le32_to_cpu(entry->e_value_size)); 2547dfa2064bSJan Kara error = ext4_xattr_move_to_block(handle, inode, raw_inode, 2548dfa2064bSJan Kara entry); 2549dfa2064bSJan Kara if (error) 2550dfa2064bSJan Kara return error; 2551dfa2064bSJan Kara 2552dfa2064bSJan Kara *total_ino -= entry_size; 2553dfa2064bSJan Kara ifree += total_size; 2554dfa2064bSJan Kara bfree -= total_size; 2555dfa2064bSJan Kara } 2556dfa2064bSJan Kara 2557dfa2064bSJan Kara return 0; 2558dfa2064bSJan Kara } 2559dfa2064bSJan Kara 25603f2571c1SJan Kara /* 25616dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 25626dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 25636dd4ee7cSKalpak Shah */ 25646dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 25656dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 25666dd4ee7cSKalpak Shah { 25676dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 25686dd4ee7cSKalpak Shah struct buffer_head *bh = NULL; 2569e3014d14SJan Kara size_t min_offs; 2570e3014d14SJan Kara size_t ifree, bfree; 25717b1b2c1bSTheodore Ts'o int total_ino; 25726e0cd088SJan Kara void *base, *end; 2573d0141191SJan Kara int error = 0, tried_min_extra_isize = 0; 2574ac39849dSAneesh Kumar K.V int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); 2575d0141191SJan Kara int isize_diff; /* How much do we need to grow i_extra_isize */ 2576c755e251STheodore Ts'o int no_expand; 25776dd4ee7cSKalpak Shah 2578c755e251STheodore Ts'o if (ext4_write_trylock_xattr(inode, &no_expand) == 0) 2579c755e251STheodore Ts'o return 0; 2580c755e251STheodore Ts'o 25816dd4ee7cSKalpak Shah retry: 2582d0141191SJan Kara isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; 25832e81a4eeSJan Kara if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) 25842e81a4eeSJan Kara goto out; 25856dd4ee7cSKalpak Shah 25866dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 25876dd4ee7cSKalpak Shah 25886dd4ee7cSKalpak Shah /* 25896dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 25906dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 25916dd4ee7cSKalpak Shah */ 25926dd4ee7cSKalpak Shah 25936e0cd088SJan Kara base = IFIRST(header); 25946dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 25956dd4ee7cSKalpak Shah min_offs = end - base; 25966dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 25976dd4ee7cSKalpak Shah 25989e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 25999e92f48cSTheodore Ts'o if (error) 26009e92f48cSTheodore Ts'o goto cleanup; 26019e92f48cSTheodore Ts'o 26026e0cd088SJan Kara ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); 2603e3014d14SJan Kara if (ifree >= isize_diff) 2604e3014d14SJan Kara goto shift; 26056dd4ee7cSKalpak Shah 26066dd4ee7cSKalpak Shah /* 26076dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 26086dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 26096dd4ee7cSKalpak Shah */ 26106dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 26116dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 26126dd4ee7cSKalpak Shah error = -EIO; 26136dd4ee7cSKalpak Shah if (!bh) 26146dd4ee7cSKalpak Shah goto cleanup; 2615cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 261624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 261724676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 26186a797d27SDarrick J. Wong error = -EFSCORRUPTED; 26196dd4ee7cSKalpak Shah goto cleanup; 26206dd4ee7cSKalpak Shah } 26216dd4ee7cSKalpak Shah base = BHDR(bh); 26226dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 26236dd4ee7cSKalpak Shah min_offs = end - base; 26246e0cd088SJan Kara bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, 26256e0cd088SJan Kara NULL); 2626e3014d14SJan Kara if (bfree + ifree < isize_diff) { 26276dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 26286dd4ee7cSKalpak Shah tried_min_extra_isize++; 26296dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 26306dd4ee7cSKalpak Shah brelse(bh); 26316dd4ee7cSKalpak Shah goto retry; 26326dd4ee7cSKalpak Shah } 2633dfa2064bSJan Kara error = -ENOSPC; 26346dd4ee7cSKalpak Shah goto cleanup; 26356dd4ee7cSKalpak Shah } 26366dd4ee7cSKalpak Shah } else { 2637e3014d14SJan Kara bfree = inode->i_sb->s_blocksize; 26386dd4ee7cSKalpak Shah } 26396dd4ee7cSKalpak Shah 2640dfa2064bSJan Kara error = ext4_xattr_make_inode_space(handle, inode, raw_inode, 2641dfa2064bSJan Kara isize_diff, ifree, bfree, 2642dfa2064bSJan Kara &total_ino); 2643dfa2064bSJan Kara if (error) { 2644dfa2064bSJan Kara if (error == -ENOSPC && !tried_min_extra_isize && 26456dd4ee7cSKalpak Shah s_min_extra_isize) { 26466dd4ee7cSKalpak Shah tried_min_extra_isize++; 26476dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 2648dcb9917bSTheodore Ts'o brelse(bh); 26496dd4ee7cSKalpak Shah goto retry; 26506dd4ee7cSKalpak Shah } 26516dd4ee7cSKalpak Shah goto cleanup; 26526dd4ee7cSKalpak Shah } 2653e3014d14SJan Kara shift: 2654e3014d14SJan Kara /* Adjust the offsets and shift the remaining entries ahead */ 26556e0cd088SJan Kara ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize 2656e3014d14SJan Kara - new_extra_isize, (void *)raw_inode + 2657e3014d14SJan Kara EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 265894405713SJan Kara (void *)header, total_ino); 2659e3014d14SJan Kara EXT4_I(inode)->i_extra_isize = new_extra_isize; 26606dd4ee7cSKalpak Shah brelse(bh); 26612e81a4eeSJan Kara out: 2662c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 26636dd4ee7cSKalpak Shah return 0; 26646dd4ee7cSKalpak Shah 26656dd4ee7cSKalpak Shah cleanup: 26666dd4ee7cSKalpak Shah brelse(bh); 26672e81a4eeSJan Kara /* 2668c755e251STheodore Ts'o * Inode size expansion failed; don't try again 26692e81a4eeSJan Kara */ 2670c755e251STheodore Ts'o no_expand = 1; 2671c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 26726dd4ee7cSKalpak Shah return error; 26736dd4ee7cSKalpak Shah } 26746dd4ee7cSKalpak Shah 2675e50e5129SAndreas Dilger #define EIA_INCR 16 /* must be 2^n */ 2676e50e5129SAndreas Dilger #define EIA_MASK (EIA_INCR - 1) 2677dec214d0STahsin Erdogan 2678dec214d0STahsin Erdogan /* Add the large xattr @inode into @ea_inode_array for deferred iput(). 26790421a189STahsin Erdogan * If @ea_inode_array is new or full it will be grown and the old 2680e50e5129SAndreas Dilger * contents copied over. 2681e50e5129SAndreas Dilger */ 2682e50e5129SAndreas Dilger static int 26830421a189STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 26840421a189STahsin Erdogan struct inode *inode) 2685e50e5129SAndreas Dilger { 26860421a189STahsin Erdogan if (*ea_inode_array == NULL) { 2687e50e5129SAndreas Dilger /* 2688e50e5129SAndreas Dilger * Start with 15 inodes, so it fits into a power-of-two size. 26890421a189STahsin Erdogan * If *ea_inode_array is NULL, this is essentially offsetof() 2690e50e5129SAndreas Dilger */ 26910421a189STahsin Erdogan (*ea_inode_array) = 26920421a189STahsin Erdogan kmalloc(offsetof(struct ext4_xattr_inode_array, 26930421a189STahsin Erdogan inodes[EIA_MASK]), 2694e50e5129SAndreas Dilger GFP_NOFS); 26950421a189STahsin Erdogan if (*ea_inode_array == NULL) 2696e50e5129SAndreas Dilger return -ENOMEM; 26970421a189STahsin Erdogan (*ea_inode_array)->count = 0; 26980421a189STahsin Erdogan } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { 2699e50e5129SAndreas Dilger /* expand the array once all 15 + n * 16 slots are full */ 27000421a189STahsin Erdogan struct ext4_xattr_inode_array *new_array = NULL; 27010421a189STahsin Erdogan int count = (*ea_inode_array)->count; 2702e50e5129SAndreas Dilger 2703e50e5129SAndreas Dilger /* if new_array is NULL, this is essentially offsetof() */ 2704e50e5129SAndreas Dilger new_array = kmalloc( 27050421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, 27060421a189STahsin Erdogan inodes[count + EIA_INCR]), 2707e50e5129SAndreas Dilger GFP_NOFS); 2708e50e5129SAndreas Dilger if (new_array == NULL) 2709e50e5129SAndreas Dilger return -ENOMEM; 27100421a189STahsin Erdogan memcpy(new_array, *ea_inode_array, 27110421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, inodes[count])); 27120421a189STahsin Erdogan kfree(*ea_inode_array); 27130421a189STahsin Erdogan *ea_inode_array = new_array; 2714e50e5129SAndreas Dilger } 27150421a189STahsin Erdogan (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; 2716e50e5129SAndreas Dilger return 0; 2717e50e5129SAndreas Dilger } 2718e50e5129SAndreas Dilger 27196dd4ee7cSKalpak Shah /* 2720617ba13bSMingming Cao * ext4_xattr_delete_inode() 2721ac27a0ecSDave Kleikamp * 2722e50e5129SAndreas Dilger * Free extended attribute resources associated with this inode. Traverse 2723dec214d0STahsin Erdogan * all entries and decrement reference on any xattr inodes associated with this 2724dec214d0STahsin Erdogan * inode. This is called immediately before an inode is freed. We have exclusive 2725dec214d0STahsin Erdogan * access to the inode. If an orphan inode is deleted it will also release its 2726dec214d0STahsin Erdogan * references on xattr block and xattr inodes. 2727ac27a0ecSDave Kleikamp */ 2728dec214d0STahsin Erdogan int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, 272930a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 273030a7eb97STahsin Erdogan int extra_credits) 2731ac27a0ecSDave Kleikamp { 2732ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 2733e50e5129SAndreas Dilger struct ext4_xattr_ibody_header *header; 273430a7eb97STahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 2735dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 273630a7eb97STahsin Erdogan int error; 273730a7eb97STahsin Erdogan 273830a7eb97STahsin Erdogan error = ext4_xattr_ensure_credits(handle, inode, extra_credits, 273930a7eb97STahsin Erdogan NULL /* bh */, 274030a7eb97STahsin Erdogan false /* dirty */, 274130a7eb97STahsin Erdogan false /* block_csum */); 274230a7eb97STahsin Erdogan if (error) { 274330a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); 274430a7eb97STahsin Erdogan goto cleanup; 274530a7eb97STahsin Erdogan } 2746ac27a0ecSDave Kleikamp 2747dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2748dec214d0STahsin Erdogan ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 2749e50e5129SAndreas Dilger 2750e50e5129SAndreas Dilger error = ext4_get_inode_loc(inode, &iloc); 2751dec214d0STahsin Erdogan if (error) { 2752dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); 2753e50e5129SAndreas Dilger goto cleanup; 2754e50e5129SAndreas Dilger } 2755dec214d0STahsin Erdogan 2756dec214d0STahsin Erdogan error = ext4_journal_get_write_access(handle, iloc.bh); 2757dec214d0STahsin Erdogan if (error) { 2758dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "write access (error %d)", 2759dec214d0STahsin Erdogan error); 2760dec214d0STahsin Erdogan goto cleanup; 2761dec214d0STahsin Erdogan } 2762dec214d0STahsin Erdogan 2763dec214d0STahsin Erdogan header = IHDR(inode, ext4_raw_inode(&iloc)); 2764dec214d0STahsin Erdogan if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) 2765dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, 2766dec214d0STahsin Erdogan IFIRST(header), 2767dec214d0STahsin Erdogan false /* block_csum */, 2768dec214d0STahsin Erdogan ea_inode_array, 2769dec214d0STahsin Erdogan extra_credits, 2770dec214d0STahsin Erdogan false /* skip_quota */); 2771dec214d0STahsin Erdogan } 2772dec214d0STahsin Erdogan 2773dec214d0STahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 2774617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 2775ac27a0ecSDave Kleikamp if (!bh) { 277624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 277724676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 277865d30005STahsin Erdogan error = -EIO; 2779ac27a0ecSDave Kleikamp goto cleanup; 2780ac27a0ecSDave Kleikamp } 2781dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2782dec214d0STahsin Erdogan if (error) { 2783dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "bad block %llu (error %d)", 2784dec214d0STahsin Erdogan EXT4_I(inode)->i_file_acl, error); 2785ac27a0ecSDave Kleikamp goto cleanup; 2786ac27a0ecSDave Kleikamp } 2787e50e5129SAndreas Dilger 278830a7eb97STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) { 2789dec214d0STahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 2790dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 2791dec214d0STahsin Erdogan if (entry->e_value_inum) 2792dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 2793dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 2794dec214d0STahsin Erdogan 2795e50e5129SAndreas Dilger } 2796e50e5129SAndreas Dilger 2797dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bh, ea_inode_array, 2798dec214d0STahsin Erdogan extra_credits); 2799dec214d0STahsin Erdogan /* 2800dec214d0STahsin Erdogan * Update i_file_acl value in the same transaction that releases 2801dec214d0STahsin Erdogan * block. 2802dec214d0STahsin Erdogan */ 2803617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 280430a7eb97STahsin Erdogan error = ext4_mark_inode_dirty(handle, inode); 280530a7eb97STahsin Erdogan if (error) { 280630a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", 280730a7eb97STahsin Erdogan error); 280830a7eb97STahsin Erdogan goto cleanup; 280930a7eb97STahsin Erdogan } 2810dec214d0STahsin Erdogan } 2811dec214d0STahsin Erdogan error = 0; 2812ac27a0ecSDave Kleikamp cleanup: 281330a7eb97STahsin Erdogan brelse(iloc.bh); 2814ac27a0ecSDave Kleikamp brelse(bh); 2815e50e5129SAndreas Dilger return error; 2816e50e5129SAndreas Dilger } 2817e50e5129SAndreas Dilger 28180421a189STahsin Erdogan void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) 2819e50e5129SAndreas Dilger { 2820dec214d0STahsin Erdogan int idx; 2821e50e5129SAndreas Dilger 28220421a189STahsin Erdogan if (ea_inode_array == NULL) 2823e50e5129SAndreas Dilger return; 2824e50e5129SAndreas Dilger 2825dec214d0STahsin Erdogan for (idx = 0; idx < ea_inode_array->count; ++idx) 2826dec214d0STahsin Erdogan iput(ea_inode_array->inodes[idx]); 28270421a189STahsin Erdogan kfree(ea_inode_array); 2828ac27a0ecSDave Kleikamp } 2829ac27a0ecSDave Kleikamp 2830ac27a0ecSDave Kleikamp /* 283147387409STahsin Erdogan * ext4_xattr_block_cache_insert() 2832ac27a0ecSDave Kleikamp * 283347387409STahsin Erdogan * Create a new entry in the extended attribute block cache, and insert 2834ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 2835ac27a0ecSDave Kleikamp * 2836ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2837ac27a0ecSDave Kleikamp */ 2838ac27a0ecSDave Kleikamp static void 283947387409STahsin Erdogan ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, 284047387409STahsin Erdogan struct buffer_head *bh) 2841ac27a0ecSDave Kleikamp { 28426048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 28436048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 28446048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 28456048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 2846ac27a0ecSDave Kleikamp int error; 2847ac27a0ecSDave Kleikamp 284847387409STahsin Erdogan error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, 28496048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 2850ac27a0ecSDave Kleikamp if (error) { 285182939d79SJan Kara if (error == -EBUSY) 2852ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 285382939d79SJan Kara } else 2854ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 2855ac27a0ecSDave Kleikamp } 2856ac27a0ecSDave Kleikamp 2857ac27a0ecSDave Kleikamp /* 2858617ba13bSMingming Cao * ext4_xattr_cmp() 2859ac27a0ecSDave Kleikamp * 2860ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 2861ac27a0ecSDave Kleikamp * 2862ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 2863ac27a0ecSDave Kleikamp * a negative error number on errors. 2864ac27a0ecSDave Kleikamp */ 2865ac27a0ecSDave Kleikamp static int 2866617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 2867617ba13bSMingming Cao struct ext4_xattr_header *header2) 2868ac27a0ecSDave Kleikamp { 2869617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 2870ac27a0ecSDave Kleikamp 2871ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 2872ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 2873ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 2874ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 2875ac27a0ecSDave Kleikamp return 1; 2876ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 2877ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 2878ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 2879ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 2880e50e5129SAndreas Dilger entry1->e_value_inum != entry2->e_value_inum || 2881ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 2882ac27a0ecSDave Kleikamp return 1; 28837cec1918STahsin Erdogan if (!entry1->e_value_inum && 28847cec1918STahsin Erdogan memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 2885ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 2886ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 2887ac27a0ecSDave Kleikamp return 1; 2888ac27a0ecSDave Kleikamp 2889617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 2890617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 2891ac27a0ecSDave Kleikamp } 2892ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 2893ac27a0ecSDave Kleikamp return 1; 2894ac27a0ecSDave Kleikamp return 0; 2895ac27a0ecSDave Kleikamp } 2896ac27a0ecSDave Kleikamp 2897ac27a0ecSDave Kleikamp /* 289847387409STahsin Erdogan * ext4_xattr_block_cache_find() 2899ac27a0ecSDave Kleikamp * 2900ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 2901ac27a0ecSDave Kleikamp * 2902ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 2903ac27a0ecSDave Kleikamp * not found or an error occurred. 2904ac27a0ecSDave Kleikamp */ 2905ac27a0ecSDave Kleikamp static struct buffer_head * 290647387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *inode, 290747387409STahsin Erdogan struct ext4_xattr_header *header, 29087a2508e1SJan Kara struct mb_cache_entry **pce) 2909ac27a0ecSDave Kleikamp { 2910ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 29117a2508e1SJan Kara struct mb_cache_entry *ce; 291247387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 2913ac27a0ecSDave Kleikamp 2914ac27a0ecSDave Kleikamp if (!header->h_hash) 2915ac27a0ecSDave Kleikamp return NULL; /* never share */ 2916ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 291747387409STahsin Erdogan ce = mb_cache_entry_find_first(ea_block_cache, hash); 2918ac27a0ecSDave Kleikamp while (ce) { 2919ac27a0ecSDave Kleikamp struct buffer_head *bh; 2920ac27a0ecSDave Kleikamp 2921c07dfcb4STahsin Erdogan bh = sb_bread(inode->i_sb, ce->e_value); 2922ac27a0ecSDave Kleikamp if (!bh) { 292324676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 2924c07dfcb4STahsin Erdogan (unsigned long)ce->e_value); 2925617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 2926ac27a0ecSDave Kleikamp *pce = ce; 2927ac27a0ecSDave Kleikamp return bh; 2928ac27a0ecSDave Kleikamp } 2929ac27a0ecSDave Kleikamp brelse(bh); 293047387409STahsin Erdogan ce = mb_cache_entry_find_next(ea_block_cache, ce); 2931ac27a0ecSDave Kleikamp } 2932ac27a0ecSDave Kleikamp return NULL; 2933ac27a0ecSDave Kleikamp } 2934ac27a0ecSDave Kleikamp 2935ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 2936ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 2937ac27a0ecSDave Kleikamp 2938ac27a0ecSDave Kleikamp /* 2939617ba13bSMingming Cao * ext4_xattr_hash_entry() 2940ac27a0ecSDave Kleikamp * 2941ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 2942ac27a0ecSDave Kleikamp */ 2943617ba13bSMingming Cao static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, 2944617ba13bSMingming Cao struct ext4_xattr_entry *entry) 2945ac27a0ecSDave Kleikamp { 2946ac27a0ecSDave Kleikamp __u32 hash = 0; 2947ac27a0ecSDave Kleikamp char *name = entry->e_name; 2948ac27a0ecSDave Kleikamp int n; 2949ac27a0ecSDave Kleikamp 2950ac27a0ecSDave Kleikamp for (n = 0; n < entry->e_name_len; n++) { 2951ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 2952ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 2953ac27a0ecSDave Kleikamp *name++; 2954ac27a0ecSDave Kleikamp } 2955ac27a0ecSDave Kleikamp 2956e50e5129SAndreas Dilger if (!entry->e_value_inum && entry->e_value_size) { 2957ac27a0ecSDave Kleikamp __le32 *value = (__le32 *)((char *)header + 2958ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs)); 2959ac27a0ecSDave Kleikamp for (n = (le32_to_cpu(entry->e_value_size) + 2960617ba13bSMingming Cao EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { 2961ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 2962ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 2963ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 2964ac27a0ecSDave Kleikamp } 2965ac27a0ecSDave Kleikamp } 2966ac27a0ecSDave Kleikamp entry->e_hash = cpu_to_le32(hash); 2967ac27a0ecSDave Kleikamp } 2968ac27a0ecSDave Kleikamp 2969ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 2970ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 2971ac27a0ecSDave Kleikamp 2972ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 2973ac27a0ecSDave Kleikamp 2974ac27a0ecSDave Kleikamp /* 2975617ba13bSMingming Cao * ext4_xattr_rehash() 2976ac27a0ecSDave Kleikamp * 2977ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 2978ac27a0ecSDave Kleikamp */ 2979617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *header, 2980617ba13bSMingming Cao struct ext4_xattr_entry *entry) 2981ac27a0ecSDave Kleikamp { 2982617ba13bSMingming Cao struct ext4_xattr_entry *here; 2983ac27a0ecSDave Kleikamp __u32 hash = 0; 2984ac27a0ecSDave Kleikamp 2985617ba13bSMingming Cao ext4_xattr_hash_entry(header, entry); 2986ac27a0ecSDave Kleikamp here = ENTRY(header+1); 2987ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 2988ac27a0ecSDave Kleikamp if (!here->e_hash) { 2989ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 2990ac27a0ecSDave Kleikamp hash = 0; 2991ac27a0ecSDave Kleikamp break; 2992ac27a0ecSDave Kleikamp } 2993ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 2994ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 2995ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 2996617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 2997ac27a0ecSDave Kleikamp } 2998ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 2999ac27a0ecSDave Kleikamp } 3000ac27a0ecSDave Kleikamp 3001ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 3002ac27a0ecSDave Kleikamp 30039c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 30049c191f70ST Makphaibulchoke 30057a2508e1SJan Kara struct mb_cache * 300682939d79SJan Kara ext4_xattr_create_cache(void) 3007ac27a0ecSDave Kleikamp { 30087a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 3009ac27a0ecSDave Kleikamp } 3010ac27a0ecSDave Kleikamp 30117a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 3012ac27a0ecSDave Kleikamp { 30139c191f70ST Makphaibulchoke if (cache) 30147a2508e1SJan Kara mb_cache_destroy(cache); 3015ac27a0ecSDave Kleikamp } 30169c191f70ST Makphaibulchoke 3017