1ac27a0ecSDave Kleikamp /* 2617ba13bSMingming Cao * linux/fs/ext4/xattr.c 3ac27a0ecSDave Kleikamp * 4ac27a0ecSDave Kleikamp * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> 5ac27a0ecSDave Kleikamp * 6ac27a0ecSDave Kleikamp * Fix by Harrison Xing <harrison@mountainviewdata.com>. 7617ba13bSMingming Cao * Ext4 code with a lot of help from Eric Jarman <ejarman@acm.org>. 8ac27a0ecSDave Kleikamp * Extended attributes for symlinks and special files added per 9ac27a0ecSDave Kleikamp * suggestion of Luka Renko <luka.renko@hermes.si>. 10ac27a0ecSDave Kleikamp * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>, 11ac27a0ecSDave Kleikamp * Red Hat Inc. 12ac27a0ecSDave Kleikamp * ea-in-inode support by Alex Tomas <alex@clusterfs.com> aka bzzz 13ac27a0ecSDave Kleikamp * and Andreas Gruenbacher <agruen@suse.de>. 14ac27a0ecSDave Kleikamp */ 15ac27a0ecSDave Kleikamp 16ac27a0ecSDave Kleikamp /* 17ac27a0ecSDave Kleikamp * Extended attributes are stored directly in inodes (on file systems with 18ac27a0ecSDave Kleikamp * inodes bigger than 128 bytes) and on additional disk blocks. The i_file_acl 19ac27a0ecSDave Kleikamp * field contains the block number if an inode uses an additional block. All 20ac27a0ecSDave Kleikamp * attributes must fit in the inode and one additional block. Blocks that 21ac27a0ecSDave Kleikamp * contain the identical set of attributes may be shared among several inodes. 22ac27a0ecSDave Kleikamp * Identical blocks are detected by keeping a cache of blocks that have 23ac27a0ecSDave Kleikamp * recently been accessed. 24ac27a0ecSDave Kleikamp * 25ac27a0ecSDave Kleikamp * The attributes in inodes and on blocks have a different header; the entries 26ac27a0ecSDave Kleikamp * are stored in the same format: 27ac27a0ecSDave Kleikamp * 28ac27a0ecSDave Kleikamp * +------------------+ 29ac27a0ecSDave Kleikamp * | header | 30ac27a0ecSDave Kleikamp * | entry 1 | | 31ac27a0ecSDave Kleikamp * | entry 2 | | growing downwards 32ac27a0ecSDave Kleikamp * | entry 3 | v 33ac27a0ecSDave Kleikamp * | four null bytes | 34ac27a0ecSDave Kleikamp * | . . . | 35ac27a0ecSDave Kleikamp * | value 1 | ^ 36ac27a0ecSDave Kleikamp * | value 3 | | growing upwards 37ac27a0ecSDave Kleikamp * | value 2 | | 38ac27a0ecSDave Kleikamp * +------------------+ 39ac27a0ecSDave Kleikamp * 40ac27a0ecSDave Kleikamp * The header is followed by multiple entry descriptors. In disk blocks, the 41ac27a0ecSDave Kleikamp * entry descriptors are kept sorted. In inodes, they are unsorted. The 42ac27a0ecSDave Kleikamp * attribute values are aligned to the end of the block in no specific order. 43ac27a0ecSDave Kleikamp * 44ac27a0ecSDave Kleikamp * Locking strategy 45ac27a0ecSDave Kleikamp * ---------------- 46617ba13bSMingming Cao * EXT4_I(inode)->i_file_acl is protected by EXT4_I(inode)->xattr_sem. 47ac27a0ecSDave Kleikamp * EA blocks are only changed if they are exclusive to an inode, so 48ac27a0ecSDave Kleikamp * holding xattr_sem also means that nothing but the EA block's reference 49ac27a0ecSDave Kleikamp * count can change. Multiple writers to the same block are synchronized 50ac27a0ecSDave Kleikamp * by the buffer lock. 51ac27a0ecSDave Kleikamp */ 52ac27a0ecSDave Kleikamp 53ac27a0ecSDave Kleikamp #include <linux/init.h> 54ac27a0ecSDave Kleikamp #include <linux/fs.h> 55ac27a0ecSDave Kleikamp #include <linux/slab.h> 567a2508e1SJan Kara #include <linux/mbcache.h> 57ac27a0ecSDave Kleikamp #include <linux/quotaops.h> 583dcf5451SChristoph Hellwig #include "ext4_jbd2.h" 593dcf5451SChristoph Hellwig #include "ext4.h" 60ac27a0ecSDave Kleikamp #include "xattr.h" 61ac27a0ecSDave Kleikamp #include "acl.h" 62ac27a0ecSDave Kleikamp 63617ba13bSMingming Cao #ifdef EXT4_XATTR_DEBUG 64d74f3d25SJoe Perches # define ea_idebug(inode, fmt, ...) \ 65d74f3d25SJoe Perches printk(KERN_DEBUG "inode %s:%lu: " fmt "\n", \ 66d74f3d25SJoe Perches inode->i_sb->s_id, inode->i_ino, ##__VA_ARGS__) 67d74f3d25SJoe Perches # define ea_bdebug(bh, fmt, ...) \ 68d74f3d25SJoe Perches printk(KERN_DEBUG "block %pg:%lu: " fmt "\n", \ 69d74f3d25SJoe Perches bh->b_bdev, (unsigned long)bh->b_blocknr, ##__VA_ARGS__) 70ac27a0ecSDave Kleikamp #else 71ace36ad4SJoe Perches # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 72ace36ad4SJoe Perches # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 73ac27a0ecSDave Kleikamp #endif 74ac27a0ecSDave Kleikamp 757a2508e1SJan Kara static void ext4_xattr_cache_insert(struct mb_cache *, struct buffer_head *); 76617ba13bSMingming Cao static struct buffer_head *ext4_xattr_cache_find(struct inode *, 77617ba13bSMingming Cao struct ext4_xattr_header *, 787a2508e1SJan Kara struct mb_cache_entry **); 79617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *, 80617ba13bSMingming Cao struct ext4_xattr_entry *); 81431547b3SChristoph Hellwig static int ext4_xattr_list(struct dentry *dentry, char *buffer, 82d3a95d47SMingming Cao size_t buffer_size); 83ac27a0ecSDave Kleikamp 8411e27528SStephen Hemminger static const struct xattr_handler *ext4_xattr_handler_map[] = { 85617ba13bSMingming Cao [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, 8603010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 8764e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, 8864e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, 89ac27a0ecSDave Kleikamp #endif 90617ba13bSMingming Cao [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, 9103010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 92617ba13bSMingming Cao [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, 93ac27a0ecSDave Kleikamp #endif 94ac27a0ecSDave Kleikamp }; 95ac27a0ecSDave Kleikamp 9611e27528SStephen Hemminger const struct xattr_handler *ext4_xattr_handlers[] = { 97617ba13bSMingming Cao &ext4_xattr_user_handler, 98617ba13bSMingming Cao &ext4_xattr_trusted_handler, 9903010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 10064e178a7SChristoph Hellwig &posix_acl_access_xattr_handler, 10164e178a7SChristoph Hellwig &posix_acl_default_xattr_handler, 102ac27a0ecSDave Kleikamp #endif 10303010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 104617ba13bSMingming Cao &ext4_xattr_security_handler, 105ac27a0ecSDave Kleikamp #endif 106ac27a0ecSDave Kleikamp NULL 107ac27a0ecSDave Kleikamp }; 108ac27a0ecSDave Kleikamp 1099c191f70ST Makphaibulchoke #define EXT4_GET_MB_CACHE(inode) (((struct ext4_sb_info *) \ 1109c191f70ST Makphaibulchoke inode->i_sb->s_fs_info)->s_mb_cache) 1119c191f70ST Makphaibulchoke 112cc8e94fdSDarrick J. Wong static __le32 ext4_xattr_block_csum(struct inode *inode, 113cc8e94fdSDarrick J. Wong sector_t block_nr, 114cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 115cc8e94fdSDarrick J. Wong { 116cc8e94fdSDarrick J. Wong struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 117d6a77105STheodore Ts'o __u32 csum; 118d6a77105STheodore Ts'o __le64 dsk_block_nr = cpu_to_le64(block_nr); 119b47820edSDaeho Jeong __u32 dummy_csum = 0; 120b47820edSDaeho Jeong int offset = offsetof(struct ext4_xattr_header, h_checksum); 121cc8e94fdSDarrick J. Wong 122d6a77105STheodore Ts'o csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, 123d6a77105STheodore Ts'o sizeof(dsk_block_nr)); 124b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); 125b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); 126b47820edSDaeho Jeong offset += sizeof(dummy_csum); 127b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, 128b47820edSDaeho Jeong EXT4_BLOCK_SIZE(inode->i_sb) - offset); 12941eb70ddSTao Ma 130cc8e94fdSDarrick J. Wong return cpu_to_le32(csum); 131cc8e94fdSDarrick J. Wong } 132cc8e94fdSDarrick J. Wong 133cc8e94fdSDarrick J. Wong static int ext4_xattr_block_csum_verify(struct inode *inode, 134*dac7a4b4STheodore Ts'o struct buffer_head *bh) 135cc8e94fdSDarrick J. Wong { 136*dac7a4b4STheodore Ts'o struct ext4_xattr_header *hdr = BHDR(bh); 137*dac7a4b4STheodore Ts'o int ret = 1; 138*dac7a4b4STheodore Ts'o 139*dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) { 140*dac7a4b4STheodore Ts'o lock_buffer(bh); 141*dac7a4b4STheodore Ts'o ret = (hdr->h_checksum == ext4_xattr_block_csum(inode, 142*dac7a4b4STheodore Ts'o bh->b_blocknr, hdr)); 143*dac7a4b4STheodore Ts'o unlock_buffer(bh); 144*dac7a4b4STheodore Ts'o } 145*dac7a4b4STheodore Ts'o return ret; 146cc8e94fdSDarrick J. Wong } 147cc8e94fdSDarrick J. Wong 148cc8e94fdSDarrick J. Wong static void ext4_xattr_block_csum_set(struct inode *inode, 149cc8e94fdSDarrick J. Wong struct buffer_head *bh) 150cc8e94fdSDarrick J. Wong { 151*dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) 152*dac7a4b4STheodore Ts'o BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode, 153*dac7a4b4STheodore Ts'o bh->b_blocknr, BHDR(bh)); 154cc8e94fdSDarrick J. Wong } 155cc8e94fdSDarrick J. Wong 15611e27528SStephen Hemminger static inline const struct xattr_handler * 157617ba13bSMingming Cao ext4_xattr_handler(int name_index) 158ac27a0ecSDave Kleikamp { 15911e27528SStephen Hemminger const struct xattr_handler *handler = NULL; 160ac27a0ecSDave Kleikamp 161617ba13bSMingming Cao if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) 162617ba13bSMingming Cao handler = ext4_xattr_handler_map[name_index]; 163ac27a0ecSDave Kleikamp return handler; 164ac27a0ecSDave Kleikamp } 165ac27a0ecSDave Kleikamp 166ac27a0ecSDave Kleikamp /* 167ac27a0ecSDave Kleikamp * Inode operation listxattr() 168ac27a0ecSDave Kleikamp * 1692b0143b5SDavid Howells * d_inode(dentry)->i_mutex: don't care 170ac27a0ecSDave Kleikamp */ 171ac27a0ecSDave Kleikamp ssize_t 172617ba13bSMingming Cao ext4_listxattr(struct dentry *dentry, char *buffer, size_t size) 173ac27a0ecSDave Kleikamp { 174431547b3SChristoph Hellwig return ext4_xattr_list(dentry, buffer, size); 175ac27a0ecSDave Kleikamp } 176ac27a0ecSDave Kleikamp 177ac27a0ecSDave Kleikamp static int 178a0626e75SDarrick J. Wong ext4_xattr_check_names(struct ext4_xattr_entry *entry, void *end, 179a0626e75SDarrick J. Wong void *value_start) 180ac27a0ecSDave Kleikamp { 181a0626e75SDarrick J. Wong struct ext4_xattr_entry *e = entry; 182a0626e75SDarrick J. Wong 183d7614cc1SEric Biggers /* Find the end of the names list */ 184a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(e)) { 185a0626e75SDarrick J. Wong struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); 186ac27a0ecSDave Kleikamp if ((void *)next >= end) 1876a797d27SDarrick J. Wong return -EFSCORRUPTED; 188a0626e75SDarrick J. Wong e = next; 189ac27a0ecSDave Kleikamp } 190a0626e75SDarrick J. Wong 191d7614cc1SEric Biggers /* Check the values */ 192a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(entry)) { 1932de58f11SJan Kara if (entry->e_value_block != 0) 1942de58f11SJan Kara return -EFSCORRUPTED; 195d7614cc1SEric Biggers if (entry->e_value_size != 0) { 196d7614cc1SEric Biggers u16 offs = le16_to_cpu(entry->e_value_offs); 197d7614cc1SEric Biggers u32 size = le32_to_cpu(entry->e_value_size); 198d7614cc1SEric Biggers void *value; 199d7614cc1SEric Biggers 200d7614cc1SEric Biggers /* 201d7614cc1SEric Biggers * The value cannot overlap the names, and the value 202d7614cc1SEric Biggers * with padding cannot extend beyond 'end'. Check both 203d7614cc1SEric Biggers * the padded and unpadded sizes, since the size may 204d7614cc1SEric Biggers * overflow to 0 when adding padding. 205d7614cc1SEric Biggers */ 206d7614cc1SEric Biggers if (offs > end - value_start) 2076a797d27SDarrick J. Wong return -EFSCORRUPTED; 208d7614cc1SEric Biggers value = value_start + offs; 209d7614cc1SEric Biggers if (value < (void *)e + sizeof(u32) || 210d7614cc1SEric Biggers size > end - value || 211d7614cc1SEric Biggers EXT4_XATTR_SIZE(size) > end - value) 212d7614cc1SEric Biggers return -EFSCORRUPTED; 213d7614cc1SEric Biggers } 214a0626e75SDarrick J. Wong entry = EXT4_XATTR_NEXT(entry); 215a0626e75SDarrick J. Wong } 216a0626e75SDarrick J. Wong 217ac27a0ecSDave Kleikamp return 0; 218ac27a0ecSDave Kleikamp } 219ac27a0ecSDave Kleikamp 220ac27a0ecSDave Kleikamp static inline int 221cc8e94fdSDarrick J. Wong ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) 222ac27a0ecSDave Kleikamp { 223cc8e94fdSDarrick J. Wong int error; 224cc8e94fdSDarrick J. Wong 225cc8e94fdSDarrick J. Wong if (buffer_verified(bh)) 226cc8e94fdSDarrick J. Wong return 0; 227cc8e94fdSDarrick J. Wong 228617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 229ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) 2306a797d27SDarrick J. Wong return -EFSCORRUPTED; 231*dac7a4b4STheodore Ts'o if (!ext4_xattr_block_csum_verify(inode, bh)) 2326a797d27SDarrick J. Wong return -EFSBADCRC; 233a0626e75SDarrick J. Wong error = ext4_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size, 234a0626e75SDarrick J. Wong bh->b_data); 235cc8e94fdSDarrick J. Wong if (!error) 236cc8e94fdSDarrick J. Wong set_buffer_verified(bh); 237cc8e94fdSDarrick J. Wong return error; 238ac27a0ecSDave Kleikamp } 239ac27a0ecSDave Kleikamp 2409e92f48cSTheodore Ts'o static int 2419e92f48cSTheodore Ts'o __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, 2429e92f48cSTheodore Ts'o void *end, const char *function, unsigned int line) 2439e92f48cSTheodore Ts'o { 2449e92f48cSTheodore Ts'o int error = -EFSCORRUPTED; 2459e92f48cSTheodore Ts'o 246290ab230SEric Biggers if (end - (void *)header < sizeof(*header) + sizeof(u32) || 24719962509SEric Biggers (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) 2489e92f48cSTheodore Ts'o goto errout; 249290ab230SEric Biggers error = ext4_xattr_check_names(IFIRST(header), end, IFIRST(header)); 2509e92f48cSTheodore Ts'o errout: 2519e92f48cSTheodore Ts'o if (error) 2529e92f48cSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, 2539e92f48cSTheodore Ts'o "corrupted in-inode xattr"); 2549e92f48cSTheodore Ts'o return error; 2559e92f48cSTheodore Ts'o } 2569e92f48cSTheodore Ts'o 2579e92f48cSTheodore Ts'o #define xattr_check_inode(inode, header, end) \ 2589e92f48cSTheodore Ts'o __xattr_check_inode((inode), (header), (end), __func__, __LINE__) 2599e92f48cSTheodore Ts'o 260ac27a0ecSDave Kleikamp static inline int 261617ba13bSMingming Cao ext4_xattr_check_entry(struct ext4_xattr_entry *entry, size_t size) 262ac27a0ecSDave Kleikamp { 263ac27a0ecSDave Kleikamp size_t value_size = le32_to_cpu(entry->e_value_size); 264ac27a0ecSDave Kleikamp 265ac27a0ecSDave Kleikamp if (entry->e_value_block != 0 || value_size > size || 266ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs) + value_size > size) 2676a797d27SDarrick J. Wong return -EFSCORRUPTED; 268ac27a0ecSDave Kleikamp return 0; 269ac27a0ecSDave Kleikamp } 270ac27a0ecSDave Kleikamp 271ac27a0ecSDave Kleikamp static int 272617ba13bSMingming Cao ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, 273ac27a0ecSDave Kleikamp const char *name, size_t size, int sorted) 274ac27a0ecSDave Kleikamp { 275617ba13bSMingming Cao struct ext4_xattr_entry *entry; 276ac27a0ecSDave Kleikamp size_t name_len; 277ac27a0ecSDave Kleikamp int cmp = 1; 278ac27a0ecSDave Kleikamp 279ac27a0ecSDave Kleikamp if (name == NULL) 280ac27a0ecSDave Kleikamp return -EINVAL; 281ac27a0ecSDave Kleikamp name_len = strlen(name); 282ac27a0ecSDave Kleikamp entry = *pentry; 283617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 284ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 285ac27a0ecSDave Kleikamp if (!cmp) 286ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 287ac27a0ecSDave Kleikamp if (!cmp) 288ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 289ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 290ac27a0ecSDave Kleikamp break; 291ac27a0ecSDave Kleikamp } 292ac27a0ecSDave Kleikamp *pentry = entry; 293617ba13bSMingming Cao if (!cmp && ext4_xattr_check_entry(entry, size)) 2946a797d27SDarrick J. Wong return -EFSCORRUPTED; 295ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 296ac27a0ecSDave Kleikamp } 297ac27a0ecSDave Kleikamp 298ac27a0ecSDave Kleikamp static int 299617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 300ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 301ac27a0ecSDave Kleikamp { 302ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 303617ba13bSMingming Cao struct ext4_xattr_entry *entry; 304ac27a0ecSDave Kleikamp size_t size; 305ac27a0ecSDave Kleikamp int error; 3067a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 307ac27a0ecSDave Kleikamp 308ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 309ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 310ac27a0ecSDave Kleikamp 311ac27a0ecSDave Kleikamp error = -ENODATA; 312617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 313ac27a0ecSDave Kleikamp goto cleanup; 314ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 315ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 316617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 317ac27a0ecSDave Kleikamp if (!bh) 318ac27a0ecSDave Kleikamp goto cleanup; 319ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 320ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 321cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 32212062dddSEric Sandeen bad_block: 32324676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 324617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 3256a797d27SDarrick J. Wong error = -EFSCORRUPTED; 326ac27a0ecSDave Kleikamp goto cleanup; 327ac27a0ecSDave Kleikamp } 3289c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, bh); 329ac27a0ecSDave Kleikamp entry = BFIRST(bh); 330617ba13bSMingming Cao error = ext4_xattr_find_entry(&entry, name_index, name, bh->b_size, 1); 3316a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 332ac27a0ecSDave Kleikamp goto bad_block; 333ac27a0ecSDave Kleikamp if (error) 334ac27a0ecSDave Kleikamp goto cleanup; 335ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 336ac27a0ecSDave Kleikamp if (buffer) { 337ac27a0ecSDave Kleikamp error = -ERANGE; 338ac27a0ecSDave Kleikamp if (size > buffer_size) 339ac27a0ecSDave Kleikamp goto cleanup; 340ac27a0ecSDave Kleikamp memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs), 341ac27a0ecSDave Kleikamp size); 342ac27a0ecSDave Kleikamp } 343ac27a0ecSDave Kleikamp error = size; 344ac27a0ecSDave Kleikamp 345ac27a0ecSDave Kleikamp cleanup: 346ac27a0ecSDave Kleikamp brelse(bh); 347ac27a0ecSDave Kleikamp return error; 348ac27a0ecSDave Kleikamp } 349ac27a0ecSDave Kleikamp 350879b3825STao Ma int 351617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 352ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 353ac27a0ecSDave Kleikamp { 354617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 355617ba13bSMingming Cao struct ext4_xattr_entry *entry; 356617ba13bSMingming Cao struct ext4_inode *raw_inode; 357617ba13bSMingming Cao struct ext4_iloc iloc; 358ac27a0ecSDave Kleikamp size_t size; 359ac27a0ecSDave Kleikamp void *end; 360ac27a0ecSDave Kleikamp int error; 361ac27a0ecSDave Kleikamp 36219f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 363ac27a0ecSDave Kleikamp return -ENODATA; 364617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 365ac27a0ecSDave Kleikamp if (error) 366ac27a0ecSDave Kleikamp return error; 367617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 368ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 369ac27a0ecSDave Kleikamp entry = IFIRST(header); 370617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 3719e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 372ac27a0ecSDave Kleikamp if (error) 373ac27a0ecSDave Kleikamp goto cleanup; 374617ba13bSMingming Cao error = ext4_xattr_find_entry(&entry, name_index, name, 375ac27a0ecSDave Kleikamp end - (void *)entry, 0); 376ac27a0ecSDave Kleikamp if (error) 377ac27a0ecSDave Kleikamp goto cleanup; 378ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 379ac27a0ecSDave Kleikamp if (buffer) { 380ac27a0ecSDave Kleikamp error = -ERANGE; 381ac27a0ecSDave Kleikamp if (size > buffer_size) 382ac27a0ecSDave Kleikamp goto cleanup; 383ac27a0ecSDave Kleikamp memcpy(buffer, (void *)IFIRST(header) + 384ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs), size); 385ac27a0ecSDave Kleikamp } 386ac27a0ecSDave Kleikamp error = size; 387ac27a0ecSDave Kleikamp 388ac27a0ecSDave Kleikamp cleanup: 389ac27a0ecSDave Kleikamp brelse(iloc.bh); 390ac27a0ecSDave Kleikamp return error; 391ac27a0ecSDave Kleikamp } 392ac27a0ecSDave Kleikamp 393ac27a0ecSDave Kleikamp /* 394617ba13bSMingming Cao * ext4_xattr_get() 395ac27a0ecSDave Kleikamp * 396ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 397ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 398ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 399ac27a0ecSDave Kleikamp * 400ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 401ac27a0ecSDave Kleikamp * used / required on success. 402ac27a0ecSDave Kleikamp */ 403ac27a0ecSDave Kleikamp int 404617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 405ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 406ac27a0ecSDave Kleikamp { 407ac27a0ecSDave Kleikamp int error; 408ac27a0ecSDave Kleikamp 4090db1ff22STheodore Ts'o if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 4100db1ff22STheodore Ts'o return -EIO; 4110db1ff22STheodore Ts'o 412230b8c1aSZhang Zhen if (strlen(name) > 255) 413230b8c1aSZhang Zhen return -ERANGE; 414230b8c1aSZhang Zhen 415617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 416617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 417ac27a0ecSDave Kleikamp buffer_size); 418ac27a0ecSDave Kleikamp if (error == -ENODATA) 419617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 420ac27a0ecSDave Kleikamp buffer_size); 421617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 422ac27a0ecSDave Kleikamp return error; 423ac27a0ecSDave Kleikamp } 424ac27a0ecSDave Kleikamp 425ac27a0ecSDave Kleikamp static int 426431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 427ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 428ac27a0ecSDave Kleikamp { 429ac27a0ecSDave Kleikamp size_t rest = buffer_size; 430ac27a0ecSDave Kleikamp 431617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 43211e27528SStephen Hemminger const struct xattr_handler *handler = 433617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 434ac27a0ecSDave Kleikamp 435764a5c6bSAndreas Gruenbacher if (handler && (!handler->list || handler->list(dentry))) { 436764a5c6bSAndreas Gruenbacher const char *prefix = handler->prefix ?: handler->name; 437764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 438764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 439764a5c6bSAndreas Gruenbacher 440ac27a0ecSDave Kleikamp if (buffer) { 441ac27a0ecSDave Kleikamp if (size > rest) 442ac27a0ecSDave Kleikamp return -ERANGE; 443764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 444764a5c6bSAndreas Gruenbacher buffer += prefix_len; 445764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 446764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 447764a5c6bSAndreas Gruenbacher *buffer++ = 0; 448ac27a0ecSDave Kleikamp } 449ac27a0ecSDave Kleikamp rest -= size; 450ac27a0ecSDave Kleikamp } 451ac27a0ecSDave Kleikamp } 452764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 453ac27a0ecSDave Kleikamp } 454ac27a0ecSDave Kleikamp 455ac27a0ecSDave Kleikamp static int 456431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 457ac27a0ecSDave Kleikamp { 4582b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 459ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 460ac27a0ecSDave Kleikamp int error; 4617a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 462ac27a0ecSDave Kleikamp 463ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 464ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 465ac27a0ecSDave Kleikamp 466ac27a0ecSDave Kleikamp error = 0; 467617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 468ac27a0ecSDave Kleikamp goto cleanup; 469ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 470ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 471617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 472ac27a0ecSDave Kleikamp error = -EIO; 473ac27a0ecSDave Kleikamp if (!bh) 474ac27a0ecSDave Kleikamp goto cleanup; 475ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 476ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 477cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 47824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 479617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 4806a797d27SDarrick J. Wong error = -EFSCORRUPTED; 481ac27a0ecSDave Kleikamp goto cleanup; 482ac27a0ecSDave Kleikamp } 4839c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, bh); 484431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); 485ac27a0ecSDave Kleikamp 486ac27a0ecSDave Kleikamp cleanup: 487ac27a0ecSDave Kleikamp brelse(bh); 488ac27a0ecSDave Kleikamp 489ac27a0ecSDave Kleikamp return error; 490ac27a0ecSDave Kleikamp } 491ac27a0ecSDave Kleikamp 492ac27a0ecSDave Kleikamp static int 493431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 494ac27a0ecSDave Kleikamp { 4952b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 496617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 497617ba13bSMingming Cao struct ext4_inode *raw_inode; 498617ba13bSMingming Cao struct ext4_iloc iloc; 499ac27a0ecSDave Kleikamp void *end; 500ac27a0ecSDave Kleikamp int error; 501ac27a0ecSDave Kleikamp 50219f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 503ac27a0ecSDave Kleikamp return 0; 504617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 505ac27a0ecSDave Kleikamp if (error) 506ac27a0ecSDave Kleikamp return error; 507617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 508ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 509617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 5109e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 511ac27a0ecSDave Kleikamp if (error) 512ac27a0ecSDave Kleikamp goto cleanup; 513431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 514ac27a0ecSDave Kleikamp buffer, buffer_size); 515ac27a0ecSDave Kleikamp 516ac27a0ecSDave Kleikamp cleanup: 517ac27a0ecSDave Kleikamp brelse(iloc.bh); 518ac27a0ecSDave Kleikamp return error; 519ac27a0ecSDave Kleikamp } 520ac27a0ecSDave Kleikamp 521ac27a0ecSDave Kleikamp /* 522617ba13bSMingming Cao * ext4_xattr_list() 523ac27a0ecSDave Kleikamp * 524ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 525ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 526ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 527ac27a0ecSDave Kleikamp * 528ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 529ac27a0ecSDave Kleikamp * used / required on success. 530ac27a0ecSDave Kleikamp */ 531d3a95d47SMingming Cao static int 532431547b3SChristoph Hellwig ext4_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size) 533ac27a0ecSDave Kleikamp { 534eaeef867STheodore Ts'o int ret, ret2; 535ac27a0ecSDave Kleikamp 5362b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 537eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 538eaeef867STheodore Ts'o if (ret < 0) 539eaeef867STheodore Ts'o goto errout; 540ac27a0ecSDave Kleikamp if (buffer) { 541eaeef867STheodore Ts'o buffer += ret; 542eaeef867STheodore Ts'o buffer_size -= ret; 543ac27a0ecSDave Kleikamp } 544eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 545eaeef867STheodore Ts'o if (ret < 0) 546eaeef867STheodore Ts'o goto errout; 547eaeef867STheodore Ts'o ret += ret2; 548eaeef867STheodore Ts'o errout: 5492b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 550eaeef867STheodore Ts'o return ret; 551ac27a0ecSDave Kleikamp } 552ac27a0ecSDave Kleikamp 553ac27a0ecSDave Kleikamp /* 554617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 555ac27a0ecSDave Kleikamp * not set, set it. 556ac27a0ecSDave Kleikamp */ 557617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 558ac27a0ecSDave Kleikamp struct super_block *sb) 559ac27a0ecSDave Kleikamp { 560e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 561ac27a0ecSDave Kleikamp return; 562ac27a0ecSDave Kleikamp 5635d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 564617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 565e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 566a0375156STheodore Ts'o ext4_handle_dirty_super(handle, sb); 567ac27a0ecSDave Kleikamp } 568ac27a0ecSDave Kleikamp } 569ac27a0ecSDave Kleikamp 570ac27a0ecSDave Kleikamp /* 571ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 572ec4cb1aaSJan Kara * otherwise free the block. 573ac27a0ecSDave Kleikamp */ 574ac27a0ecSDave Kleikamp static void 575617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 576ac27a0ecSDave Kleikamp struct buffer_head *bh) 577ac27a0ecSDave Kleikamp { 5786048c64bSAndreas Gruenbacher struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 5796048c64bSAndreas Gruenbacher u32 hash, ref; 5808a2bfdcbSMingming Cao int error = 0; 581ac27a0ecSDave Kleikamp 5825d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 5838a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 5848a2bfdcbSMingming Cao if (error) 5858a2bfdcbSMingming Cao goto out; 5868a2bfdcbSMingming Cao 5878a2bfdcbSMingming Cao lock_buffer(bh); 5886048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 5896048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 5906048c64bSAndreas Gruenbacher if (ref == 1) { 591ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 59282939d79SJan Kara /* 59382939d79SJan Kara * This must happen under buffer lock for 59482939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 59582939d79SJan Kara */ 5966048c64bSAndreas Gruenbacher mb_cache_entry_delete_block(ext4_mb_cache, hash, bh->b_blocknr); 597ac27a0ecSDave Kleikamp get_bh(bh); 598ec4cb1aaSJan Kara unlock_buffer(bh); 599e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 600e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 601e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 602ac27a0ecSDave Kleikamp } else { 6036048c64bSAndreas Gruenbacher ref--; 6046048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 6056048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 6066048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 6076048c64bSAndreas Gruenbacher 6086048c64bSAndreas Gruenbacher ce = mb_cache_entry_get(ext4_mb_cache, hash, 6096048c64bSAndreas Gruenbacher bh->b_blocknr); 6106048c64bSAndreas Gruenbacher if (ce) { 6116048c64bSAndreas Gruenbacher ce->e_reusable = 1; 6126048c64bSAndreas Gruenbacher mb_cache_entry_put(ext4_mb_cache, ce); 6136048c64bSAndreas Gruenbacher } 6146048c64bSAndreas Gruenbacher } 6156048c64bSAndreas Gruenbacher 616*dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bh); 617ec4cb1aaSJan Kara /* 618ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 619ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 620ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 621ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 622ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 623*dac7a4b4STheodore Ts'o * call ext4_handle_dirty_metadata() with locked buffer as 624ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 625ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 626ec4cb1aaSJan Kara */ 627ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 628*dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 629c1bb05a6SEric Sandeen unlock_buffer(bh); 630ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 631*dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 632ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 6330390131bSFrank Mayhar ext4_handle_sync(handle); 6341231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 635ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 636ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 637ac27a0ecSDave Kleikamp } 6388a2bfdcbSMingming Cao out: 6398a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 6408a2bfdcbSMingming Cao return; 641ac27a0ecSDave Kleikamp } 642ac27a0ecSDave Kleikamp 6436dd4ee7cSKalpak Shah /* 6446dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 6456dd4ee7cSKalpak Shah * bytes used by EA entries. 6466dd4ee7cSKalpak Shah */ 6476dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 6486dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 6496dd4ee7cSKalpak Shah { 6506dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 6511cba4237SJan Kara if (last->e_value_size) { 6526dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 6536dd4ee7cSKalpak Shah if (offs < *min_offs) 6546dd4ee7cSKalpak Shah *min_offs = offs; 6556dd4ee7cSKalpak Shah } 6567b1b2c1bSTheodore Ts'o if (total) 6577b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 6586dd4ee7cSKalpak Shah } 6596dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 6606dd4ee7cSKalpak Shah } 6616dd4ee7cSKalpak Shah 662ac27a0ecSDave Kleikamp static int 663617ba13bSMingming Cao ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s) 664ac27a0ecSDave Kleikamp { 665617ba13bSMingming Cao struct ext4_xattr_entry *last; 666ac27a0ecSDave Kleikamp size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); 667ac27a0ecSDave Kleikamp 668ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 669ac27a0ecSDave Kleikamp last = s->first; 670617ba13bSMingming Cao for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 6711cba4237SJan Kara if (last->e_value_size) { 672ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 673ac27a0ecSDave Kleikamp if (offs < min_offs) 674ac27a0ecSDave Kleikamp min_offs = offs; 675ac27a0ecSDave Kleikamp } 676ac27a0ecSDave Kleikamp } 677ac27a0ecSDave Kleikamp free = min_offs - ((void *)last - s->base) - sizeof(__u32); 678ac27a0ecSDave Kleikamp if (!s->not_found) { 6791cba4237SJan Kara if (s->here->e_value_size) { 680ac27a0ecSDave Kleikamp size_t size = le32_to_cpu(s->here->e_value_size); 681617ba13bSMingming Cao free += EXT4_XATTR_SIZE(size); 682ac27a0ecSDave Kleikamp } 683617ba13bSMingming Cao free += EXT4_XATTR_LEN(name_len); 684ac27a0ecSDave Kleikamp } 685ac27a0ecSDave Kleikamp if (i->value) { 6865f80f62aSWei Yuan if (free < EXT4_XATTR_LEN(name_len) + 687617ba13bSMingming Cao EXT4_XATTR_SIZE(i->value_len)) 688ac27a0ecSDave Kleikamp return -ENOSPC; 689ac27a0ecSDave Kleikamp } 690ac27a0ecSDave Kleikamp 691ac27a0ecSDave Kleikamp if (i->value && s->not_found) { 692ac27a0ecSDave Kleikamp /* Insert the new name. */ 693617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 694ac27a0ecSDave Kleikamp size_t rest = (void *)last - (void *)s->here + sizeof(__u32); 695ac27a0ecSDave Kleikamp memmove((void *)s->here + size, s->here, rest); 696ac27a0ecSDave Kleikamp memset(s->here, 0, size); 697ac27a0ecSDave Kleikamp s->here->e_name_index = i->name_index; 698ac27a0ecSDave Kleikamp s->here->e_name_len = name_len; 699ac27a0ecSDave Kleikamp memcpy(s->here->e_name, i->name, name_len); 700ac27a0ecSDave Kleikamp } else { 7011cba4237SJan Kara if (s->here->e_value_size) { 702ac27a0ecSDave Kleikamp void *first_val = s->base + min_offs; 703ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(s->here->e_value_offs); 704ac27a0ecSDave Kleikamp void *val = s->base + offs; 705617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE( 706ac27a0ecSDave Kleikamp le32_to_cpu(s->here->e_value_size)); 707ac27a0ecSDave Kleikamp 708617ba13bSMingming Cao if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { 709ac27a0ecSDave Kleikamp /* The old and the new value have the same 710ac27a0ecSDave Kleikamp size. Just replace. */ 711ac27a0ecSDave Kleikamp s->here->e_value_size = 712ac27a0ecSDave Kleikamp cpu_to_le32(i->value_len); 713bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 714bd9926e8STheodore Ts'o memset(val, 0, size); 715bd9926e8STheodore Ts'o } else { 716bd9926e8STheodore Ts'o /* Clear pad bytes first. */ 717617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 718bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 719ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 720bd9926e8STheodore Ts'o } 721ac27a0ecSDave Kleikamp return 0; 722ac27a0ecSDave Kleikamp } 723ac27a0ecSDave Kleikamp 724ac27a0ecSDave Kleikamp /* Remove the old value. */ 725ac27a0ecSDave Kleikamp memmove(first_val + size, first_val, val - first_val); 726ac27a0ecSDave Kleikamp memset(first_val, 0, size); 727ac27a0ecSDave Kleikamp s->here->e_value_size = 0; 728ac27a0ecSDave Kleikamp s->here->e_value_offs = 0; 729ac27a0ecSDave Kleikamp min_offs += size; 730ac27a0ecSDave Kleikamp 731ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 732ac27a0ecSDave Kleikamp last = s->first; 733ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 734ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 7351cba4237SJan Kara if (last->e_value_size && o < offs) 736ac27a0ecSDave Kleikamp last->e_value_offs = 737ac27a0ecSDave Kleikamp cpu_to_le16(o + size); 738617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 739ac27a0ecSDave Kleikamp } 740ac27a0ecSDave Kleikamp } 741ac27a0ecSDave Kleikamp if (!i->value) { 742ac27a0ecSDave Kleikamp /* Remove the old name. */ 743617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 744ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 745ac27a0ecSDave Kleikamp memmove(s->here, (void *)s->here + size, 746ac27a0ecSDave Kleikamp (void *)last - (void *)s->here + sizeof(__u32)); 747ac27a0ecSDave Kleikamp memset(last, 0, size); 748ac27a0ecSDave Kleikamp } 749ac27a0ecSDave Kleikamp } 750ac27a0ecSDave Kleikamp 751ac27a0ecSDave Kleikamp if (i->value) { 752ac27a0ecSDave Kleikamp /* Insert the new value. */ 753ac27a0ecSDave Kleikamp s->here->e_value_size = cpu_to_le32(i->value_len); 754ac27a0ecSDave Kleikamp if (i->value_len) { 755617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE(i->value_len); 756ac27a0ecSDave Kleikamp void *val = s->base + min_offs - size; 757ac27a0ecSDave Kleikamp s->here->e_value_offs = cpu_to_le16(min_offs - size); 758bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 759bd9926e8STheodore Ts'o memset(val, 0, size); 760bd9926e8STheodore Ts'o } else { 761bd9926e8STheodore Ts'o /* Clear the pad bytes first. */ 762617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 763bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 764ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 765ac27a0ecSDave Kleikamp } 766ac27a0ecSDave Kleikamp } 767bd9926e8STheodore Ts'o } 768ac27a0ecSDave Kleikamp return 0; 769ac27a0ecSDave Kleikamp } 770ac27a0ecSDave Kleikamp 771617ba13bSMingming Cao struct ext4_xattr_block_find { 772617ba13bSMingming Cao struct ext4_xattr_search s; 773ac27a0ecSDave Kleikamp struct buffer_head *bh; 774ac27a0ecSDave Kleikamp }; 775ac27a0ecSDave Kleikamp 776ac27a0ecSDave Kleikamp static int 777617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 778617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 779ac27a0ecSDave Kleikamp { 780ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 781ac27a0ecSDave Kleikamp int error; 782ac27a0ecSDave Kleikamp 783ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 784ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 785ac27a0ecSDave Kleikamp 786617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 787ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 788617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 789ac27a0ecSDave Kleikamp error = -EIO; 790ac27a0ecSDave Kleikamp if (!bs->bh) 791ac27a0ecSDave Kleikamp goto cleanup; 792ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 793ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 794ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 795cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bs->bh)) { 79624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 79724676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 7986a797d27SDarrick J. Wong error = -EFSCORRUPTED; 799ac27a0ecSDave Kleikamp goto cleanup; 800ac27a0ecSDave Kleikamp } 801ac27a0ecSDave Kleikamp /* Find the named attribute. */ 802ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 803ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 804ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 805ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 806617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 807ac27a0ecSDave Kleikamp i->name, bs->bh->b_size, 1); 808ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 809ac27a0ecSDave Kleikamp goto cleanup; 810ac27a0ecSDave Kleikamp bs->s.not_found = error; 811ac27a0ecSDave Kleikamp } 812ac27a0ecSDave Kleikamp error = 0; 813ac27a0ecSDave Kleikamp 814ac27a0ecSDave Kleikamp cleanup: 815ac27a0ecSDave Kleikamp return error; 816ac27a0ecSDave Kleikamp } 817ac27a0ecSDave Kleikamp 818ac27a0ecSDave Kleikamp static int 819617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 820617ba13bSMingming Cao struct ext4_xattr_info *i, 821617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 822ac27a0ecSDave Kleikamp { 823ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 824ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 825617ba13bSMingming Cao struct ext4_xattr_search *s = &bs->s; 8267a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 8278a2bfdcbSMingming Cao int error = 0; 8287a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 829ac27a0ecSDave Kleikamp 830617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 831ac27a0ecSDave Kleikamp 832ac27a0ecSDave Kleikamp if (i->value && i->value_len > sb->s_blocksize) 833ac27a0ecSDave Kleikamp return -ENOSPC; 834ac27a0ecSDave Kleikamp if (s->base) { 8355d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 8368a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 8378a2bfdcbSMingming Cao if (error) 8388a2bfdcbSMingming Cao goto cleanup; 8398a2bfdcbSMingming Cao lock_buffer(bs->bh); 8408a2bfdcbSMingming Cao 841ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 84282939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 84382939d79SJan Kara 84482939d79SJan Kara /* 84582939d79SJan Kara * This must happen under buffer lock for 84682939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 84782939d79SJan Kara * block 84882939d79SJan Kara */ 8497a2508e1SJan Kara mb_cache_entry_delete_block(ext4_mb_cache, hash, 85082939d79SJan Kara bs->bh->b_blocknr); 851ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 852617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 853ac27a0ecSDave Kleikamp if (!error) { 854ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 855617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), 856ac27a0ecSDave Kleikamp s->here); 8579c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, 8589c191f70ST Makphaibulchoke bs->bh); 859ac27a0ecSDave Kleikamp } 860*dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bs->bh); 861ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 8626a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 863ac27a0ecSDave Kleikamp goto bad_block; 864ac27a0ecSDave Kleikamp if (!error) 865*dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 8660390131bSFrank Mayhar inode, 867ac27a0ecSDave Kleikamp bs->bh); 868ac27a0ecSDave Kleikamp if (error) 869ac27a0ecSDave Kleikamp goto cleanup; 870ac27a0ecSDave Kleikamp goto inserted; 871ac27a0ecSDave Kleikamp } else { 872ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 873ac27a0ecSDave Kleikamp 8748a2bfdcbSMingming Cao unlock_buffer(bs->bh); 875ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 876216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 877ac27a0ecSDave Kleikamp error = -ENOMEM; 878ac27a0ecSDave Kleikamp if (s->base == NULL) 879ac27a0ecSDave Kleikamp goto cleanup; 880ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 881ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 882ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 883ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 884ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 885ac27a0ecSDave Kleikamp } 886ac27a0ecSDave Kleikamp } else { 887ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 888216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 889ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 890ac27a0ecSDave Kleikamp error = -ENOMEM; 891ac27a0ecSDave Kleikamp if (s->base == NULL) 892ac27a0ecSDave Kleikamp goto cleanup; 893617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 894ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 895ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 896ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 897ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 898ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 899ac27a0ecSDave Kleikamp } 900ac27a0ecSDave Kleikamp 901617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 9026a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 903ac27a0ecSDave Kleikamp goto bad_block; 904ac27a0ecSDave Kleikamp if (error) 905ac27a0ecSDave Kleikamp goto cleanup; 906ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 907617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), s->here); 908ac27a0ecSDave Kleikamp 909ac27a0ecSDave Kleikamp inserted: 910ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 911617ba13bSMingming Cao new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); 912ac27a0ecSDave Kleikamp if (new_bh) { 913ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 914ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 915ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 916ac27a0ecSDave Kleikamp else { 9176048c64bSAndreas Gruenbacher u32 ref; 9186048c64bSAndreas Gruenbacher 919ac27a0ecSDave Kleikamp /* The old block is released after updating 920ac27a0ecSDave Kleikamp the inode. */ 9211231b3a1SLukas Czerner error = dquot_alloc_block(inode, 9221231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 9235dd4056dSChristoph Hellwig if (error) 924ac27a0ecSDave Kleikamp goto cleanup; 9255d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 926617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 927ac27a0ecSDave Kleikamp new_bh); 928ac27a0ecSDave Kleikamp if (error) 929ac27a0ecSDave Kleikamp goto cleanup_dquot; 930ac27a0ecSDave Kleikamp lock_buffer(new_bh); 93182939d79SJan Kara /* 93282939d79SJan Kara * We have to be careful about races with 9336048c64bSAndreas Gruenbacher * freeing, rehashing or adding references to 9346048c64bSAndreas Gruenbacher * xattr block. Once we hold buffer lock xattr 9356048c64bSAndreas Gruenbacher * block's state is stable so we can check 9366048c64bSAndreas Gruenbacher * whether the block got freed / rehashed or 9376048c64bSAndreas Gruenbacher * not. Since we unhash mbcache entry under 9386048c64bSAndreas Gruenbacher * buffer lock when freeing / rehashing xattr 9396048c64bSAndreas Gruenbacher * block, checking whether entry is still 9406048c64bSAndreas Gruenbacher * hashed is reliable. Same rules hold for 9416048c64bSAndreas Gruenbacher * e_reusable handling. 94282939d79SJan Kara */ 9436048c64bSAndreas Gruenbacher if (hlist_bl_unhashed(&ce->e_hash_list) || 9446048c64bSAndreas Gruenbacher !ce->e_reusable) { 94582939d79SJan Kara /* 94682939d79SJan Kara * Undo everything and check mbcache 94782939d79SJan Kara * again. 94882939d79SJan Kara */ 94982939d79SJan Kara unlock_buffer(new_bh); 95082939d79SJan Kara dquot_free_block(inode, 95182939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 95282939d79SJan Kara 1)); 95382939d79SJan Kara brelse(new_bh); 9547a2508e1SJan Kara mb_cache_entry_put(ext4_mb_cache, ce); 95582939d79SJan Kara ce = NULL; 95682939d79SJan Kara new_bh = NULL; 95782939d79SJan Kara goto inserted; 95882939d79SJan Kara } 9596048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 9606048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 9616048c64bSAndreas Gruenbacher if (ref >= EXT4_XATTR_REFCOUNT_MAX) 9626048c64bSAndreas Gruenbacher ce->e_reusable = 0; 963ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 9646048c64bSAndreas Gruenbacher ref); 965*dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 966ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 967*dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 9680390131bSFrank Mayhar inode, 969ac27a0ecSDave Kleikamp new_bh); 970ac27a0ecSDave Kleikamp if (error) 971ac27a0ecSDave Kleikamp goto cleanup_dquot; 972ac27a0ecSDave Kleikamp } 9737a2508e1SJan Kara mb_cache_entry_touch(ext4_mb_cache, ce); 9747a2508e1SJan Kara mb_cache_entry_put(ext4_mb_cache, ce); 975ac27a0ecSDave Kleikamp ce = NULL; 976ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 977ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 978ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 979ac27a0ecSDave Kleikamp new_bh = bs->bh; 980ac27a0ecSDave Kleikamp get_bh(new_bh); 981ac27a0ecSDave Kleikamp } else { 982ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 983fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 984fb0a387dSEric Sandeen 985fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 986d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 987fb0a387dSEric Sandeen 988fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 98912e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 990fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 991fb0a387dSEric Sandeen 99255f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 99355f020dbSAllison Henderson NULL, &error); 994ac27a0ecSDave Kleikamp if (error) 995ac27a0ecSDave Kleikamp goto cleanup; 996fb0a387dSEric Sandeen 99712e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 998fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 999fb0a387dSEric Sandeen 1000ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 1001ace36ad4SJoe Perches (unsigned long long)block); 1002ac27a0ecSDave Kleikamp 1003ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 1004aebf0243SWang Shilong if (unlikely(!new_bh)) { 1005860d21e2STheodore Ts'o error = -ENOMEM; 1006ac27a0ecSDave Kleikamp getblk_failed: 10077dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 1008e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 1009ac27a0ecSDave Kleikamp goto cleanup; 1010ac27a0ecSDave Kleikamp } 1011ac27a0ecSDave Kleikamp lock_buffer(new_bh); 1012617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 1013ac27a0ecSDave Kleikamp if (error) { 1014ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 1015860d21e2STheodore Ts'o error = -EIO; 1016ac27a0ecSDave Kleikamp goto getblk_failed; 1017ac27a0ecSDave Kleikamp } 1018ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 1019*dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 1020ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 1021ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 10229c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, new_bh); 1023*dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, 1024*dac7a4b4STheodore Ts'o new_bh); 1025ac27a0ecSDave Kleikamp if (error) 1026ac27a0ecSDave Kleikamp goto cleanup; 1027ac27a0ecSDave Kleikamp } 1028ac27a0ecSDave Kleikamp } 1029ac27a0ecSDave Kleikamp 1030ac27a0ecSDave Kleikamp /* Update the inode. */ 1031617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 1032ac27a0ecSDave Kleikamp 1033ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 1034ac27a0ecSDave Kleikamp if (bs->bh && bs->bh != new_bh) 1035617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bs->bh); 1036ac27a0ecSDave Kleikamp error = 0; 1037ac27a0ecSDave Kleikamp 1038ac27a0ecSDave Kleikamp cleanup: 1039ac27a0ecSDave Kleikamp if (ce) 10407a2508e1SJan Kara mb_cache_entry_put(ext4_mb_cache, ce); 1041ac27a0ecSDave Kleikamp brelse(new_bh); 1042ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 1043ac27a0ecSDave Kleikamp kfree(s->base); 1044ac27a0ecSDave Kleikamp 1045ac27a0ecSDave Kleikamp return error; 1046ac27a0ecSDave Kleikamp 1047ac27a0ecSDave Kleikamp cleanup_dquot: 10481231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 1049ac27a0ecSDave Kleikamp goto cleanup; 1050ac27a0ecSDave Kleikamp 1051ac27a0ecSDave Kleikamp bad_block: 105224676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 105324676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1054ac27a0ecSDave Kleikamp goto cleanup; 1055ac27a0ecSDave Kleikamp 1056ac27a0ecSDave Kleikamp #undef header 1057ac27a0ecSDave Kleikamp } 1058ac27a0ecSDave Kleikamp 1059879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 1060617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 1061ac27a0ecSDave Kleikamp { 1062617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 1063617ba13bSMingming Cao struct ext4_inode *raw_inode; 1064ac27a0ecSDave Kleikamp int error; 1065ac27a0ecSDave Kleikamp 1066617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 1067ac27a0ecSDave Kleikamp return 0; 1068617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 1069ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 1070ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 1071ac27a0ecSDave Kleikamp is->s.here = is->s.first; 1072617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 107319f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 10749e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 1075ac27a0ecSDave Kleikamp if (error) 1076ac27a0ecSDave Kleikamp return error; 1077ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1078617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 1079ac27a0ecSDave Kleikamp i->name, is->s.end - 1080ac27a0ecSDave Kleikamp (void *)is->s.base, 0); 1081ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1082ac27a0ecSDave Kleikamp return error; 1083ac27a0ecSDave Kleikamp is->s.not_found = error; 1084ac27a0ecSDave Kleikamp } 1085ac27a0ecSDave Kleikamp return 0; 1086ac27a0ecSDave Kleikamp } 1087ac27a0ecSDave Kleikamp 10880d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 10890d812f77STao Ma struct ext4_xattr_info *i, 10900d812f77STao Ma struct ext4_xattr_ibody_find *is) 10910d812f77STao Ma { 10920d812f77STao Ma struct ext4_xattr_ibody_header *header; 10930d812f77STao Ma struct ext4_xattr_search *s = &is->s; 10940d812f77STao Ma int error; 10950d812f77STao Ma 10960d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 10970d812f77STao Ma return -ENOSPC; 10980d812f77STao Ma error = ext4_xattr_set_entry(i, s); 10990d812f77STao Ma if (error) { 11000d812f77STao Ma if (error == -ENOSPC && 11010d812f77STao Ma ext4_has_inline_data(inode)) { 11020d812f77STao Ma error = ext4_try_to_evict_inline_data(handle, inode, 11030d812f77STao Ma EXT4_XATTR_LEN(strlen(i->name) + 11040d812f77STao Ma EXT4_XATTR_SIZE(i->value_len))); 11050d812f77STao Ma if (error) 11060d812f77STao Ma return error; 11070d812f77STao Ma error = ext4_xattr_ibody_find(inode, i, is); 11080d812f77STao Ma if (error) 11090d812f77STao Ma return error; 11100d812f77STao Ma error = ext4_xattr_set_entry(i, s); 11110d812f77STao Ma } 11120d812f77STao Ma if (error) 11130d812f77STao Ma return error; 11140d812f77STao Ma } 11150d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 11160d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 11170d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 11180d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 11190d812f77STao Ma } else { 11200d812f77STao Ma header->h_magic = cpu_to_le32(0); 11210d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 11220d812f77STao Ma } 11230d812f77STao Ma return 0; 11240d812f77STao Ma } 11250d812f77STao Ma 1126d5c8dab6SEric Whitney static int ext4_xattr_ibody_set(struct inode *inode, 1127617ba13bSMingming Cao struct ext4_xattr_info *i, 1128617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 1129ac27a0ecSDave Kleikamp { 1130617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 1131617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 1132ac27a0ecSDave Kleikamp int error; 1133ac27a0ecSDave Kleikamp 1134617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 1135ac27a0ecSDave Kleikamp return -ENOSPC; 1136617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 1137ac27a0ecSDave Kleikamp if (error) 1138ac27a0ecSDave Kleikamp return error; 1139617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 1140ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 1141617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 114219f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 1143ac27a0ecSDave Kleikamp } else { 1144ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 114519f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 1146ac27a0ecSDave Kleikamp } 1147ac27a0ecSDave Kleikamp return 0; 1148ac27a0ecSDave Kleikamp } 1149ac27a0ecSDave Kleikamp 11503fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 11513fd16462SJan Kara struct ext4_xattr_info *i) 11523fd16462SJan Kara { 11533fd16462SJan Kara void *value; 11543fd16462SJan Kara 11553fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 11563fd16462SJan Kara return 0; 11573fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 11583fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 11593fd16462SJan Kara } 11603fd16462SJan Kara 1161ac27a0ecSDave Kleikamp /* 1162617ba13bSMingming Cao * ext4_xattr_set_handle() 1163ac27a0ecSDave Kleikamp * 11646e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 1165ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 1166ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 1167ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 1168ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 1169ac27a0ecSDave Kleikamp * previous to the call, respectively. 1170ac27a0ecSDave Kleikamp * 1171ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1172ac27a0ecSDave Kleikamp */ 1173ac27a0ecSDave Kleikamp int 1174617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 1175ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 1176ac27a0ecSDave Kleikamp int flags) 1177ac27a0ecSDave Kleikamp { 1178617ba13bSMingming Cao struct ext4_xattr_info i = { 1179ac27a0ecSDave Kleikamp .name_index = name_index, 1180ac27a0ecSDave Kleikamp .name = name, 1181ac27a0ecSDave Kleikamp .value = value, 1182ac27a0ecSDave Kleikamp .value_len = value_len, 1183ac27a0ecSDave Kleikamp 1184ac27a0ecSDave Kleikamp }; 1185617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 1186ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1187ac27a0ecSDave Kleikamp }; 1188617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 1189ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1190ac27a0ecSDave Kleikamp }; 1191c755e251STheodore Ts'o int no_expand; 1192ac27a0ecSDave Kleikamp int error; 1193ac27a0ecSDave Kleikamp 1194ac27a0ecSDave Kleikamp if (!name) 1195ac27a0ecSDave Kleikamp return -EINVAL; 1196ac27a0ecSDave Kleikamp if (strlen(name) > 255) 1197ac27a0ecSDave Kleikamp return -ERANGE; 1198c755e251STheodore Ts'o ext4_write_lock_xattr(inode, &no_expand); 11994d20c685SKalpak Shah 120066543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 120186ebfd08SEric Sandeen if (error) 120286ebfd08SEric Sandeen goto cleanup; 120386ebfd08SEric Sandeen 120419f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 1205617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 1206617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 120719f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 1208ac27a0ecSDave Kleikamp } 1209ac27a0ecSDave Kleikamp 1210617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 1211ac27a0ecSDave Kleikamp if (error) 1212ac27a0ecSDave Kleikamp goto cleanup; 1213ac27a0ecSDave Kleikamp if (is.s.not_found) 1214617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 1215ac27a0ecSDave Kleikamp if (error) 1216ac27a0ecSDave Kleikamp goto cleanup; 1217ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 1218ac27a0ecSDave Kleikamp error = -ENODATA; 1219ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 1220ac27a0ecSDave Kleikamp goto cleanup; 1221ac27a0ecSDave Kleikamp error = 0; 1222ac27a0ecSDave Kleikamp if (!value) 1223ac27a0ecSDave Kleikamp goto cleanup; 1224ac27a0ecSDave Kleikamp } else { 1225ac27a0ecSDave Kleikamp error = -EEXIST; 1226ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 1227ac27a0ecSDave Kleikamp goto cleanup; 1228ac27a0ecSDave Kleikamp } 1229ac27a0ecSDave Kleikamp if (!value) { 1230ac27a0ecSDave Kleikamp if (!is.s.not_found) 1231d5c8dab6SEric Whitney error = ext4_xattr_ibody_set(inode, &i, &is); 1232ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 1233617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1234ac27a0ecSDave Kleikamp } else { 12353fd16462SJan Kara error = 0; 12363fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 12373fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 12383fd16462SJan Kara goto cleanup; 12393fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 12403fd16462SJan Kara goto cleanup; 12413fd16462SJan Kara 1242d5c8dab6SEric Whitney error = ext4_xattr_ibody_set(inode, &i, &is); 1243ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 1244ac27a0ecSDave Kleikamp i.value = NULL; 1245617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1246ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 12477e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 12487e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 12497e01c8e5STiger Yang if (error) 12507e01c8e5STiger Yang goto cleanup; 12517e01c8e5STiger Yang } 1252617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1253ac27a0ecSDave Kleikamp if (error) 1254ac27a0ecSDave Kleikamp goto cleanup; 1255ac27a0ecSDave Kleikamp if (!is.s.not_found) { 1256ac27a0ecSDave Kleikamp i.value = NULL; 1257d5c8dab6SEric Whitney error = ext4_xattr_ibody_set(inode, &i, &is); 1258ac27a0ecSDave Kleikamp } 1259ac27a0ecSDave Kleikamp } 1260ac27a0ecSDave Kleikamp } 1261ac27a0ecSDave Kleikamp if (!error) { 1262617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 1263eeca7ea1SDeepa Dinamani inode->i_ctime = current_time(inode); 12646dd4ee7cSKalpak Shah if (!value) 1265c755e251STheodore Ts'o no_expand = 0; 1266617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 1267ac27a0ecSDave Kleikamp /* 1268617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 1269ac27a0ecSDave Kleikamp * error != 0. 1270ac27a0ecSDave Kleikamp */ 1271ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 1272ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 12730390131bSFrank Mayhar ext4_handle_sync(handle); 1274ac27a0ecSDave Kleikamp } 1275ac27a0ecSDave Kleikamp 1276ac27a0ecSDave Kleikamp cleanup: 1277ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 1278ac27a0ecSDave Kleikamp brelse(bs.bh); 1279c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 1280ac27a0ecSDave Kleikamp return error; 1281ac27a0ecSDave Kleikamp } 1282ac27a0ecSDave Kleikamp 1283ac27a0ecSDave Kleikamp /* 1284617ba13bSMingming Cao * ext4_xattr_set() 1285ac27a0ecSDave Kleikamp * 1286617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 1287ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 1288ac27a0ecSDave Kleikamp * 1289ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1290ac27a0ecSDave Kleikamp */ 1291ac27a0ecSDave Kleikamp int 1292617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 1293ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 1294ac27a0ecSDave Kleikamp { 1295ac27a0ecSDave Kleikamp handle_t *handle; 1296ac27a0ecSDave Kleikamp int error, retries = 0; 129795eaefbdSTheodore Ts'o int credits = ext4_jbd2_credits_xattr(inode); 1298ac27a0ecSDave Kleikamp 1299ac27a0ecSDave Kleikamp retry: 13009924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 1301ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 1302ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 1303ac27a0ecSDave Kleikamp } else { 1304ac27a0ecSDave Kleikamp int error2; 1305ac27a0ecSDave Kleikamp 1306617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 1307ac27a0ecSDave Kleikamp value, value_len, flags); 1308617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 1309ac27a0ecSDave Kleikamp if (error == -ENOSPC && 1310617ba13bSMingming Cao ext4_should_retry_alloc(inode->i_sb, &retries)) 1311ac27a0ecSDave Kleikamp goto retry; 1312ac27a0ecSDave Kleikamp if (error == 0) 1313ac27a0ecSDave Kleikamp error = error2; 1314ac27a0ecSDave Kleikamp } 1315ac27a0ecSDave Kleikamp 1316ac27a0ecSDave Kleikamp return error; 1317ac27a0ecSDave Kleikamp } 1318ac27a0ecSDave Kleikamp 1319ac27a0ecSDave Kleikamp /* 13206dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 13216dd4ee7cSKalpak Shah * i_extra_isize. 13226dd4ee7cSKalpak Shah */ 13236dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 13246dd4ee7cSKalpak Shah int value_offs_shift, void *to, 132594405713SJan Kara void *from, size_t n) 13266dd4ee7cSKalpak Shah { 13276dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 13286dd4ee7cSKalpak Shah int new_offs; 13296dd4ee7cSKalpak Shah 133094405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 133194405713SJan Kara BUG_ON(value_offs_shift > 0); 133294405713SJan Kara 13336dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 13346dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 13351cba4237SJan Kara if (last->e_value_size) { 13366dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 13376dd4ee7cSKalpak Shah value_offs_shift; 13386dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 13396dd4ee7cSKalpak Shah } 13406dd4ee7cSKalpak Shah } 13416dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 13426dd4ee7cSKalpak Shah memmove(to, from, n); 13436dd4ee7cSKalpak Shah } 13446dd4ee7cSKalpak Shah 13456dd4ee7cSKalpak Shah /* 13463f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 13473f2571c1SJan Kara */ 13483f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 13493f2571c1SJan Kara struct ext4_inode *raw_inode, 13503f2571c1SJan Kara struct ext4_xattr_entry *entry) 13513f2571c1SJan Kara { 13523f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 13533f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 13543f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 13553f2571c1SJan Kara size_t value_offs, value_size; 13563f2571c1SJan Kara struct ext4_xattr_info i = { 13573f2571c1SJan Kara .value = NULL, 13583f2571c1SJan Kara .value_len = 0, 13593f2571c1SJan Kara .name_index = entry->e_name_index, 13603f2571c1SJan Kara }; 13613f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 13623f2571c1SJan Kara int error; 13633f2571c1SJan Kara 13643f2571c1SJan Kara value_offs = le16_to_cpu(entry->e_value_offs); 13653f2571c1SJan Kara value_size = le32_to_cpu(entry->e_value_size); 13663f2571c1SJan Kara 13673f2571c1SJan Kara is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 13683f2571c1SJan Kara bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 13693f2571c1SJan Kara buffer = kmalloc(value_size, GFP_NOFS); 13703f2571c1SJan Kara b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 13713f2571c1SJan Kara if (!is || !bs || !buffer || !b_entry_name) { 13723f2571c1SJan Kara error = -ENOMEM; 13733f2571c1SJan Kara goto out; 13743f2571c1SJan Kara } 13753f2571c1SJan Kara 13763f2571c1SJan Kara is->s.not_found = -ENODATA; 13773f2571c1SJan Kara bs->s.not_found = -ENODATA; 13783f2571c1SJan Kara is->iloc.bh = NULL; 13793f2571c1SJan Kara bs->bh = NULL; 13803f2571c1SJan Kara 13813f2571c1SJan Kara /* Save the entry name and the entry value */ 13823f2571c1SJan Kara memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); 13833f2571c1SJan Kara memcpy(b_entry_name, entry->e_name, entry->e_name_len); 13843f2571c1SJan Kara b_entry_name[entry->e_name_len] = '\0'; 13853f2571c1SJan Kara i.name = b_entry_name; 13863f2571c1SJan Kara 13873f2571c1SJan Kara error = ext4_get_inode_loc(inode, &is->iloc); 13883f2571c1SJan Kara if (error) 13893f2571c1SJan Kara goto out; 13903f2571c1SJan Kara 13913f2571c1SJan Kara error = ext4_xattr_ibody_find(inode, &i, is); 13923f2571c1SJan Kara if (error) 13933f2571c1SJan Kara goto out; 13943f2571c1SJan Kara 13953f2571c1SJan Kara /* Remove the chosen entry from the inode */ 1396d5c8dab6SEric Whitney error = ext4_xattr_ibody_set(inode, &i, is); 13973f2571c1SJan Kara if (error) 13983f2571c1SJan Kara goto out; 13993f2571c1SJan Kara 14003f2571c1SJan Kara i.name = b_entry_name; 14013f2571c1SJan Kara i.value = buffer; 14023f2571c1SJan Kara i.value_len = value_size; 14033f2571c1SJan Kara error = ext4_xattr_block_find(inode, &i, bs); 14043f2571c1SJan Kara if (error) 14053f2571c1SJan Kara goto out; 14063f2571c1SJan Kara 14073f2571c1SJan Kara /* Add entry which was removed from the inode into the block */ 14083f2571c1SJan Kara error = ext4_xattr_block_set(handle, inode, &i, bs); 14093f2571c1SJan Kara if (error) 14103f2571c1SJan Kara goto out; 14113f2571c1SJan Kara error = 0; 14123f2571c1SJan Kara out: 14133f2571c1SJan Kara kfree(b_entry_name); 14143f2571c1SJan Kara kfree(buffer); 14153f2571c1SJan Kara if (is) 14163f2571c1SJan Kara brelse(is->iloc.bh); 14173f2571c1SJan Kara kfree(is); 14183f2571c1SJan Kara kfree(bs); 14193f2571c1SJan Kara 14203f2571c1SJan Kara return error; 14213f2571c1SJan Kara } 14223f2571c1SJan Kara 1423dfa2064bSJan Kara static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, 1424dfa2064bSJan Kara struct ext4_inode *raw_inode, 1425dfa2064bSJan Kara int isize_diff, size_t ifree, 1426dfa2064bSJan Kara size_t bfree, int *total_ino) 1427dfa2064bSJan Kara { 1428dfa2064bSJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 1429dfa2064bSJan Kara struct ext4_xattr_entry *small_entry; 1430dfa2064bSJan Kara struct ext4_xattr_entry *entry; 1431dfa2064bSJan Kara struct ext4_xattr_entry *last; 1432dfa2064bSJan Kara unsigned int entry_size; /* EA entry size */ 1433dfa2064bSJan Kara unsigned int total_size; /* EA entry size + value size */ 1434dfa2064bSJan Kara unsigned int min_total_size; 1435dfa2064bSJan Kara int error; 1436dfa2064bSJan Kara 1437dfa2064bSJan Kara while (isize_diff > ifree) { 1438dfa2064bSJan Kara entry = NULL; 1439dfa2064bSJan Kara small_entry = NULL; 1440dfa2064bSJan Kara min_total_size = ~0U; 1441dfa2064bSJan Kara last = IFIRST(header); 1442dfa2064bSJan Kara /* Find the entry best suited to be pushed into EA block */ 1443dfa2064bSJan Kara for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1444dfa2064bSJan Kara total_size = 1445dfa2064bSJan Kara EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + 1446dfa2064bSJan Kara EXT4_XATTR_LEN(last->e_name_len); 1447dfa2064bSJan Kara if (total_size <= bfree && 1448dfa2064bSJan Kara total_size < min_total_size) { 1449dfa2064bSJan Kara if (total_size + ifree < isize_diff) { 1450dfa2064bSJan Kara small_entry = last; 1451dfa2064bSJan Kara } else { 1452dfa2064bSJan Kara entry = last; 1453dfa2064bSJan Kara min_total_size = total_size; 1454dfa2064bSJan Kara } 1455dfa2064bSJan Kara } 1456dfa2064bSJan Kara } 1457dfa2064bSJan Kara 1458dfa2064bSJan Kara if (entry == NULL) { 1459dfa2064bSJan Kara if (small_entry == NULL) 1460dfa2064bSJan Kara return -ENOSPC; 1461dfa2064bSJan Kara entry = small_entry; 1462dfa2064bSJan Kara } 1463dfa2064bSJan Kara 1464dfa2064bSJan Kara entry_size = EXT4_XATTR_LEN(entry->e_name_len); 1465dfa2064bSJan Kara total_size = entry_size + 1466dfa2064bSJan Kara EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)); 1467dfa2064bSJan Kara error = ext4_xattr_move_to_block(handle, inode, raw_inode, 1468dfa2064bSJan Kara entry); 1469dfa2064bSJan Kara if (error) 1470dfa2064bSJan Kara return error; 1471dfa2064bSJan Kara 1472dfa2064bSJan Kara *total_ino -= entry_size; 1473dfa2064bSJan Kara ifree += total_size; 1474dfa2064bSJan Kara bfree -= total_size; 1475dfa2064bSJan Kara } 1476dfa2064bSJan Kara 1477dfa2064bSJan Kara return 0; 1478dfa2064bSJan Kara } 1479dfa2064bSJan Kara 14803f2571c1SJan Kara /* 14816dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 14826dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 14836dd4ee7cSKalpak Shah */ 14846dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 14856dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 14866dd4ee7cSKalpak Shah { 14876dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 14886dd4ee7cSKalpak Shah struct buffer_head *bh = NULL; 1489e3014d14SJan Kara size_t min_offs; 1490e3014d14SJan Kara size_t ifree, bfree; 14917b1b2c1bSTheodore Ts'o int total_ino; 14926e0cd088SJan Kara void *base, *end; 1493d0141191SJan Kara int error = 0, tried_min_extra_isize = 0; 1494ac39849dSAneesh Kumar K.V int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); 1495d0141191SJan Kara int isize_diff; /* How much do we need to grow i_extra_isize */ 1496c755e251STheodore Ts'o int no_expand; 14976dd4ee7cSKalpak Shah 1498c755e251STheodore Ts'o if (ext4_write_trylock_xattr(inode, &no_expand) == 0) 1499c755e251STheodore Ts'o return 0; 1500c755e251STheodore Ts'o 15016dd4ee7cSKalpak Shah retry: 1502d0141191SJan Kara isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; 15032e81a4eeSJan Kara if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) 15042e81a4eeSJan Kara goto out; 15056dd4ee7cSKalpak Shah 15066dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 15076dd4ee7cSKalpak Shah 15086dd4ee7cSKalpak Shah /* 15096dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 15106dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 15116dd4ee7cSKalpak Shah */ 15126dd4ee7cSKalpak Shah 15136e0cd088SJan Kara base = IFIRST(header); 15146dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 15156dd4ee7cSKalpak Shah min_offs = end - base; 15166dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 15176dd4ee7cSKalpak Shah 15189e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 15199e92f48cSTheodore Ts'o if (error) 15209e92f48cSTheodore Ts'o goto cleanup; 15219e92f48cSTheodore Ts'o 15226e0cd088SJan Kara ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); 1523e3014d14SJan Kara if (ifree >= isize_diff) 1524e3014d14SJan Kara goto shift; 15256dd4ee7cSKalpak Shah 15266dd4ee7cSKalpak Shah /* 15276dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 15286dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 15296dd4ee7cSKalpak Shah */ 15306dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 15316dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 15326dd4ee7cSKalpak Shah error = -EIO; 15336dd4ee7cSKalpak Shah if (!bh) 15346dd4ee7cSKalpak Shah goto cleanup; 1535cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 153624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 153724676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 15386a797d27SDarrick J. Wong error = -EFSCORRUPTED; 15396dd4ee7cSKalpak Shah goto cleanup; 15406dd4ee7cSKalpak Shah } 15416dd4ee7cSKalpak Shah base = BHDR(bh); 15426dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 15436dd4ee7cSKalpak Shah min_offs = end - base; 15446e0cd088SJan Kara bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, 15456e0cd088SJan Kara NULL); 1546e3014d14SJan Kara if (bfree + ifree < isize_diff) { 15476dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 15486dd4ee7cSKalpak Shah tried_min_extra_isize++; 15496dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 15506dd4ee7cSKalpak Shah brelse(bh); 15516dd4ee7cSKalpak Shah goto retry; 15526dd4ee7cSKalpak Shah } 1553dfa2064bSJan Kara error = -ENOSPC; 15546dd4ee7cSKalpak Shah goto cleanup; 15556dd4ee7cSKalpak Shah } 15566dd4ee7cSKalpak Shah } else { 1557e3014d14SJan Kara bfree = inode->i_sb->s_blocksize; 15586dd4ee7cSKalpak Shah } 15596dd4ee7cSKalpak Shah 1560dfa2064bSJan Kara error = ext4_xattr_make_inode_space(handle, inode, raw_inode, 1561dfa2064bSJan Kara isize_diff, ifree, bfree, 1562dfa2064bSJan Kara &total_ino); 1563dfa2064bSJan Kara if (error) { 1564dfa2064bSJan Kara if (error == -ENOSPC && !tried_min_extra_isize && 15656dd4ee7cSKalpak Shah s_min_extra_isize) { 15666dd4ee7cSKalpak Shah tried_min_extra_isize++; 15676dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 1568dcb9917bSTheodore Ts'o brelse(bh); 15696dd4ee7cSKalpak Shah goto retry; 15706dd4ee7cSKalpak Shah } 15716dd4ee7cSKalpak Shah goto cleanup; 15726dd4ee7cSKalpak Shah } 1573e3014d14SJan Kara shift: 1574e3014d14SJan Kara /* Adjust the offsets and shift the remaining entries ahead */ 15756e0cd088SJan Kara ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize 1576e3014d14SJan Kara - new_extra_isize, (void *)raw_inode + 1577e3014d14SJan Kara EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 157894405713SJan Kara (void *)header, total_ino); 1579e3014d14SJan Kara EXT4_I(inode)->i_extra_isize = new_extra_isize; 15806dd4ee7cSKalpak Shah brelse(bh); 15812e81a4eeSJan Kara out: 1582c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 15836dd4ee7cSKalpak Shah return 0; 15846dd4ee7cSKalpak Shah 15856dd4ee7cSKalpak Shah cleanup: 15866dd4ee7cSKalpak Shah brelse(bh); 15872e81a4eeSJan Kara /* 1588c755e251STheodore Ts'o * Inode size expansion failed; don't try again 15892e81a4eeSJan Kara */ 1590c755e251STheodore Ts'o no_expand = 1; 1591c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 15926dd4ee7cSKalpak Shah return error; 15936dd4ee7cSKalpak Shah } 15946dd4ee7cSKalpak Shah 15956dd4ee7cSKalpak Shah 15966dd4ee7cSKalpak Shah 15976dd4ee7cSKalpak Shah /* 1598617ba13bSMingming Cao * ext4_xattr_delete_inode() 1599ac27a0ecSDave Kleikamp * 1600ac27a0ecSDave Kleikamp * Free extended attribute resources associated with this inode. This 1601ac27a0ecSDave Kleikamp * is called immediately before an inode is freed. We have exclusive 1602ac27a0ecSDave Kleikamp * access to the inode. 1603ac27a0ecSDave Kleikamp */ 1604ac27a0ecSDave Kleikamp void 1605617ba13bSMingming Cao ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) 1606ac27a0ecSDave Kleikamp { 1607ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 1608ac27a0ecSDave Kleikamp 1609617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 1610ac27a0ecSDave Kleikamp goto cleanup; 1611617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 1612ac27a0ecSDave Kleikamp if (!bh) { 161324676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 161424676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1615ac27a0ecSDave Kleikamp goto cleanup; 1616ac27a0ecSDave Kleikamp } 1617617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 1618ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) { 161924676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 162024676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1621ac27a0ecSDave Kleikamp goto cleanup; 1622ac27a0ecSDave Kleikamp } 1623617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bh); 1624617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 1625ac27a0ecSDave Kleikamp 1626ac27a0ecSDave Kleikamp cleanup: 1627ac27a0ecSDave Kleikamp brelse(bh); 1628ac27a0ecSDave Kleikamp } 1629ac27a0ecSDave Kleikamp 1630ac27a0ecSDave Kleikamp /* 1631617ba13bSMingming Cao * ext4_xattr_cache_insert() 1632ac27a0ecSDave Kleikamp * 1633ac27a0ecSDave Kleikamp * Create a new entry in the extended attribute cache, and insert 1634ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 1635ac27a0ecSDave Kleikamp * 1636ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1637ac27a0ecSDave Kleikamp */ 1638ac27a0ecSDave Kleikamp static void 16397a2508e1SJan Kara ext4_xattr_cache_insert(struct mb_cache *ext4_mb_cache, struct buffer_head *bh) 1640ac27a0ecSDave Kleikamp { 16416048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 16426048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 16436048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 16446048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 1645ac27a0ecSDave Kleikamp int error; 1646ac27a0ecSDave Kleikamp 16477a2508e1SJan Kara error = mb_cache_entry_create(ext4_mb_cache, GFP_NOFS, hash, 16486048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 1649ac27a0ecSDave Kleikamp if (error) { 165082939d79SJan Kara if (error == -EBUSY) 1651ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 165282939d79SJan Kara } else 1653ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 1654ac27a0ecSDave Kleikamp } 1655ac27a0ecSDave Kleikamp 1656ac27a0ecSDave Kleikamp /* 1657617ba13bSMingming Cao * ext4_xattr_cmp() 1658ac27a0ecSDave Kleikamp * 1659ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 1660ac27a0ecSDave Kleikamp * 1661ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 1662ac27a0ecSDave Kleikamp * a negative error number on errors. 1663ac27a0ecSDave Kleikamp */ 1664ac27a0ecSDave Kleikamp static int 1665617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 1666617ba13bSMingming Cao struct ext4_xattr_header *header2) 1667ac27a0ecSDave Kleikamp { 1668617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 1669ac27a0ecSDave Kleikamp 1670ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 1671ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 1672ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 1673ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 1674ac27a0ecSDave Kleikamp return 1; 1675ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 1676ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 1677ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 1678ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 1679ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 1680ac27a0ecSDave Kleikamp return 1; 1681ac27a0ecSDave Kleikamp if (entry1->e_value_block != 0 || entry2->e_value_block != 0) 16826a797d27SDarrick J. Wong return -EFSCORRUPTED; 1683ac27a0ecSDave Kleikamp if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 1684ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 1685ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 1686ac27a0ecSDave Kleikamp return 1; 1687ac27a0ecSDave Kleikamp 1688617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 1689617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 1690ac27a0ecSDave Kleikamp } 1691ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 1692ac27a0ecSDave Kleikamp return 1; 1693ac27a0ecSDave Kleikamp return 0; 1694ac27a0ecSDave Kleikamp } 1695ac27a0ecSDave Kleikamp 1696ac27a0ecSDave Kleikamp /* 1697617ba13bSMingming Cao * ext4_xattr_cache_find() 1698ac27a0ecSDave Kleikamp * 1699ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 1700ac27a0ecSDave Kleikamp * 1701ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 1702ac27a0ecSDave Kleikamp * not found or an error occurred. 1703ac27a0ecSDave Kleikamp */ 1704ac27a0ecSDave Kleikamp static struct buffer_head * 1705617ba13bSMingming Cao ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, 17067a2508e1SJan Kara struct mb_cache_entry **pce) 1707ac27a0ecSDave Kleikamp { 1708ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 17097a2508e1SJan Kara struct mb_cache_entry *ce; 17107a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 1711ac27a0ecSDave Kleikamp 1712ac27a0ecSDave Kleikamp if (!header->h_hash) 1713ac27a0ecSDave Kleikamp return NULL; /* never share */ 1714ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 17157a2508e1SJan Kara ce = mb_cache_entry_find_first(ext4_mb_cache, hash); 1716ac27a0ecSDave Kleikamp while (ce) { 1717ac27a0ecSDave Kleikamp struct buffer_head *bh; 1718ac27a0ecSDave Kleikamp 1719ac27a0ecSDave Kleikamp bh = sb_bread(inode->i_sb, ce->e_block); 1720ac27a0ecSDave Kleikamp if (!bh) { 172124676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 172224676da4STheodore Ts'o (unsigned long) ce->e_block); 1723617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 1724ac27a0ecSDave Kleikamp *pce = ce; 1725ac27a0ecSDave Kleikamp return bh; 1726ac27a0ecSDave Kleikamp } 1727ac27a0ecSDave Kleikamp brelse(bh); 17287a2508e1SJan Kara ce = mb_cache_entry_find_next(ext4_mb_cache, ce); 1729ac27a0ecSDave Kleikamp } 1730ac27a0ecSDave Kleikamp return NULL; 1731ac27a0ecSDave Kleikamp } 1732ac27a0ecSDave Kleikamp 1733ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 1734ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 1735ac27a0ecSDave Kleikamp 1736ac27a0ecSDave Kleikamp /* 1737617ba13bSMingming Cao * ext4_xattr_hash_entry() 1738ac27a0ecSDave Kleikamp * 1739ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 1740ac27a0ecSDave Kleikamp */ 1741617ba13bSMingming Cao static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, 1742617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1743ac27a0ecSDave Kleikamp { 1744ac27a0ecSDave Kleikamp __u32 hash = 0; 1745ac27a0ecSDave Kleikamp char *name = entry->e_name; 1746ac27a0ecSDave Kleikamp int n; 1747ac27a0ecSDave Kleikamp 1748ac27a0ecSDave Kleikamp for (n = 0; n < entry->e_name_len; n++) { 1749ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 1750ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 1751ac27a0ecSDave Kleikamp *name++; 1752ac27a0ecSDave Kleikamp } 1753ac27a0ecSDave Kleikamp 17541cba4237SJan Kara if (entry->e_value_size != 0) { 1755ac27a0ecSDave Kleikamp __le32 *value = (__le32 *)((char *)header + 1756ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs)); 1757ac27a0ecSDave Kleikamp for (n = (le32_to_cpu(entry->e_value_size) + 1758617ba13bSMingming Cao EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { 1759ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 1760ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 1761ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 1762ac27a0ecSDave Kleikamp } 1763ac27a0ecSDave Kleikamp } 1764ac27a0ecSDave Kleikamp entry->e_hash = cpu_to_le32(hash); 1765ac27a0ecSDave Kleikamp } 1766ac27a0ecSDave Kleikamp 1767ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 1768ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 1769ac27a0ecSDave Kleikamp 1770ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 1771ac27a0ecSDave Kleikamp 1772ac27a0ecSDave Kleikamp /* 1773617ba13bSMingming Cao * ext4_xattr_rehash() 1774ac27a0ecSDave Kleikamp * 1775ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 1776ac27a0ecSDave Kleikamp */ 1777617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *header, 1778617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1779ac27a0ecSDave Kleikamp { 1780617ba13bSMingming Cao struct ext4_xattr_entry *here; 1781ac27a0ecSDave Kleikamp __u32 hash = 0; 1782ac27a0ecSDave Kleikamp 1783617ba13bSMingming Cao ext4_xattr_hash_entry(header, entry); 1784ac27a0ecSDave Kleikamp here = ENTRY(header+1); 1785ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 1786ac27a0ecSDave Kleikamp if (!here->e_hash) { 1787ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 1788ac27a0ecSDave Kleikamp hash = 0; 1789ac27a0ecSDave Kleikamp break; 1790ac27a0ecSDave Kleikamp } 1791ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 1792ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 1793ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 1794617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 1795ac27a0ecSDave Kleikamp } 1796ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 1797ac27a0ecSDave Kleikamp } 1798ac27a0ecSDave Kleikamp 1799ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 1800ac27a0ecSDave Kleikamp 18019c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 18029c191f70ST Makphaibulchoke 18037a2508e1SJan Kara struct mb_cache * 180482939d79SJan Kara ext4_xattr_create_cache(void) 1805ac27a0ecSDave Kleikamp { 18067a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 1807ac27a0ecSDave Kleikamp } 1808ac27a0ecSDave Kleikamp 18097a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 1810ac27a0ecSDave Kleikamp { 18119c191f70ST Makphaibulchoke if (cache) 18127a2508e1SJan Kara mb_cache_destroy(cache); 1813ac27a0ecSDave Kleikamp } 18149c191f70ST Makphaibulchoke 1815