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 64ac27a0ecSDave Kleikamp # define ea_idebug(inode, f...) do { \ 65ac27a0ecSDave Kleikamp printk(KERN_DEBUG "inode %s:%lu: ", \ 66ac27a0ecSDave Kleikamp inode->i_sb->s_id, inode->i_ino); \ 67ac27a0ecSDave Kleikamp printk(f); \ 68ac27a0ecSDave Kleikamp printk("\n"); \ 69ac27a0ecSDave Kleikamp } while (0) 70ac27a0ecSDave Kleikamp # define ea_bdebug(bh, f...) do { \ 71a1c6f057SDmitry Monakhov printk(KERN_DEBUG "block %pg:%lu: ", \ 72a1c6f057SDmitry Monakhov bh->b_bdev, (unsigned long) bh->b_blocknr); \ 73ac27a0ecSDave Kleikamp printk(f); \ 74ac27a0ecSDave Kleikamp printk("\n"); \ 75ac27a0ecSDave Kleikamp } while (0) 76ac27a0ecSDave Kleikamp #else 77ace36ad4SJoe Perches # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 78ace36ad4SJoe Perches # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 79ac27a0ecSDave Kleikamp #endif 80ac27a0ecSDave Kleikamp 817a2508e1SJan Kara static void ext4_xattr_cache_insert(struct mb_cache *, struct buffer_head *); 82617ba13bSMingming Cao static struct buffer_head *ext4_xattr_cache_find(struct inode *, 83617ba13bSMingming Cao struct ext4_xattr_header *, 847a2508e1SJan Kara struct mb_cache_entry **); 85617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *, 86617ba13bSMingming Cao struct ext4_xattr_entry *); 87431547b3SChristoph Hellwig static int ext4_xattr_list(struct dentry *dentry, char *buffer, 88d3a95d47SMingming Cao size_t buffer_size); 89ac27a0ecSDave Kleikamp 9011e27528SStephen Hemminger static const struct xattr_handler *ext4_xattr_handler_map[] = { 91617ba13bSMingming Cao [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, 9203010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 9364e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, 9464e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, 95ac27a0ecSDave Kleikamp #endif 96617ba13bSMingming Cao [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, 9703010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 98617ba13bSMingming Cao [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, 99ac27a0ecSDave Kleikamp #endif 100ac27a0ecSDave Kleikamp }; 101ac27a0ecSDave Kleikamp 10211e27528SStephen Hemminger const struct xattr_handler *ext4_xattr_handlers[] = { 103617ba13bSMingming Cao &ext4_xattr_user_handler, 104617ba13bSMingming Cao &ext4_xattr_trusted_handler, 10503010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 10664e178a7SChristoph Hellwig &posix_acl_access_xattr_handler, 10764e178a7SChristoph Hellwig &posix_acl_default_xattr_handler, 108ac27a0ecSDave Kleikamp #endif 10903010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 110617ba13bSMingming Cao &ext4_xattr_security_handler, 111ac27a0ecSDave Kleikamp #endif 112ac27a0ecSDave Kleikamp NULL 113ac27a0ecSDave Kleikamp }; 114ac27a0ecSDave Kleikamp 1159c191f70ST Makphaibulchoke #define EXT4_GET_MB_CACHE(inode) (((struct ext4_sb_info *) \ 1169c191f70ST Makphaibulchoke inode->i_sb->s_fs_info)->s_mb_cache) 1179c191f70ST Makphaibulchoke 118cc8e94fdSDarrick J. Wong static __le32 ext4_xattr_block_csum(struct inode *inode, 119cc8e94fdSDarrick J. Wong sector_t block_nr, 120cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 121cc8e94fdSDarrick J. Wong { 122cc8e94fdSDarrick J. Wong struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 123d6a77105STheodore Ts'o __u32 csum; 124d6a77105STheodore Ts'o __le64 dsk_block_nr = cpu_to_le64(block_nr); 125*b47820edSDaeho Jeong __u32 dummy_csum = 0; 126*b47820edSDaeho Jeong int offset = offsetof(struct ext4_xattr_header, h_checksum); 127cc8e94fdSDarrick J. Wong 128d6a77105STheodore Ts'o csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, 129d6a77105STheodore Ts'o sizeof(dsk_block_nr)); 130*b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); 131*b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); 132*b47820edSDaeho Jeong offset += sizeof(dummy_csum); 133*b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, 134*b47820edSDaeho Jeong EXT4_BLOCK_SIZE(inode->i_sb) - offset); 13541eb70ddSTao Ma 136cc8e94fdSDarrick J. Wong return cpu_to_le32(csum); 137cc8e94fdSDarrick J. Wong } 138cc8e94fdSDarrick J. Wong 139cc8e94fdSDarrick J. Wong static int ext4_xattr_block_csum_verify(struct inode *inode, 140cc8e94fdSDarrick J. Wong sector_t block_nr, 141cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 142cc8e94fdSDarrick J. Wong { 1439aa5d32bSDmitry Monakhov if (ext4_has_metadata_csum(inode->i_sb) && 144cc8e94fdSDarrick J. Wong (hdr->h_checksum != ext4_xattr_block_csum(inode, block_nr, hdr))) 145cc8e94fdSDarrick J. Wong return 0; 146cc8e94fdSDarrick J. Wong return 1; 147cc8e94fdSDarrick J. Wong } 148cc8e94fdSDarrick J. Wong 149cc8e94fdSDarrick J. Wong static void ext4_xattr_block_csum_set(struct inode *inode, 150cc8e94fdSDarrick J. Wong sector_t block_nr, 151cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 152cc8e94fdSDarrick J. Wong { 1539aa5d32bSDmitry Monakhov if (!ext4_has_metadata_csum(inode->i_sb)) 154cc8e94fdSDarrick J. Wong return; 155cc8e94fdSDarrick J. Wong 156cc8e94fdSDarrick J. Wong hdr->h_checksum = ext4_xattr_block_csum(inode, block_nr, hdr); 157cc8e94fdSDarrick J. Wong } 158cc8e94fdSDarrick J. Wong 159cc8e94fdSDarrick J. Wong static inline int ext4_handle_dirty_xattr_block(handle_t *handle, 160cc8e94fdSDarrick J. Wong struct inode *inode, 161cc8e94fdSDarrick J. Wong struct buffer_head *bh) 162cc8e94fdSDarrick J. Wong { 163cc8e94fdSDarrick J. Wong ext4_xattr_block_csum_set(inode, bh->b_blocknr, BHDR(bh)); 164cc8e94fdSDarrick J. Wong return ext4_handle_dirty_metadata(handle, inode, bh); 165cc8e94fdSDarrick J. Wong } 166cc8e94fdSDarrick J. Wong 16711e27528SStephen Hemminger static inline const struct xattr_handler * 168617ba13bSMingming Cao ext4_xattr_handler(int name_index) 169ac27a0ecSDave Kleikamp { 17011e27528SStephen Hemminger const struct xattr_handler *handler = NULL; 171ac27a0ecSDave Kleikamp 172617ba13bSMingming Cao if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) 173617ba13bSMingming Cao handler = ext4_xattr_handler_map[name_index]; 174ac27a0ecSDave Kleikamp return handler; 175ac27a0ecSDave Kleikamp } 176ac27a0ecSDave Kleikamp 177ac27a0ecSDave Kleikamp /* 178ac27a0ecSDave Kleikamp * Inode operation listxattr() 179ac27a0ecSDave Kleikamp * 1802b0143b5SDavid Howells * d_inode(dentry)->i_mutex: don't care 181ac27a0ecSDave Kleikamp */ 182ac27a0ecSDave Kleikamp ssize_t 183617ba13bSMingming Cao ext4_listxattr(struct dentry *dentry, char *buffer, size_t size) 184ac27a0ecSDave Kleikamp { 185431547b3SChristoph Hellwig return ext4_xattr_list(dentry, buffer, size); 186ac27a0ecSDave Kleikamp } 187ac27a0ecSDave Kleikamp 188ac27a0ecSDave Kleikamp static int 189a0626e75SDarrick J. Wong ext4_xattr_check_names(struct ext4_xattr_entry *entry, void *end, 190a0626e75SDarrick J. Wong void *value_start) 191ac27a0ecSDave Kleikamp { 192a0626e75SDarrick J. Wong struct ext4_xattr_entry *e = entry; 193a0626e75SDarrick J. Wong 194a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(e)) { 195a0626e75SDarrick J. Wong struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); 196ac27a0ecSDave Kleikamp if ((void *)next >= end) 1976a797d27SDarrick J. Wong return -EFSCORRUPTED; 198a0626e75SDarrick J. Wong e = next; 199ac27a0ecSDave Kleikamp } 200a0626e75SDarrick J. Wong 201a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(entry)) { 202a0626e75SDarrick J. Wong if (entry->e_value_size != 0 && 203a0626e75SDarrick J. Wong (value_start + le16_to_cpu(entry->e_value_offs) < 204a0626e75SDarrick J. Wong (void *)e + sizeof(__u32) || 205a0626e75SDarrick J. Wong value_start + le16_to_cpu(entry->e_value_offs) + 206a0626e75SDarrick J. Wong le32_to_cpu(entry->e_value_size) > end)) 2076a797d27SDarrick J. Wong return -EFSCORRUPTED; 208a0626e75SDarrick J. Wong entry = EXT4_XATTR_NEXT(entry); 209a0626e75SDarrick J. Wong } 210a0626e75SDarrick J. Wong 211ac27a0ecSDave Kleikamp return 0; 212ac27a0ecSDave Kleikamp } 213ac27a0ecSDave Kleikamp 214ac27a0ecSDave Kleikamp static inline int 215cc8e94fdSDarrick J. Wong ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) 216ac27a0ecSDave Kleikamp { 217cc8e94fdSDarrick J. Wong int error; 218cc8e94fdSDarrick J. Wong 219cc8e94fdSDarrick J. Wong if (buffer_verified(bh)) 220cc8e94fdSDarrick J. Wong return 0; 221cc8e94fdSDarrick J. Wong 222617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 223ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) 2246a797d27SDarrick J. Wong return -EFSCORRUPTED; 225cc8e94fdSDarrick J. Wong if (!ext4_xattr_block_csum_verify(inode, bh->b_blocknr, BHDR(bh))) 2266a797d27SDarrick J. Wong return -EFSBADCRC; 227a0626e75SDarrick J. Wong error = ext4_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size, 228a0626e75SDarrick J. Wong bh->b_data); 229cc8e94fdSDarrick J. Wong if (!error) 230cc8e94fdSDarrick J. Wong set_buffer_verified(bh); 231cc8e94fdSDarrick J. Wong return error; 232ac27a0ecSDave Kleikamp } 233ac27a0ecSDave Kleikamp 2349e92f48cSTheodore Ts'o static int 2359e92f48cSTheodore Ts'o __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, 2369e92f48cSTheodore Ts'o void *end, const char *function, unsigned int line) 2379e92f48cSTheodore Ts'o { 2389e92f48cSTheodore Ts'o struct ext4_xattr_entry *entry = IFIRST(header); 2399e92f48cSTheodore Ts'o int error = -EFSCORRUPTED; 2409e92f48cSTheodore Ts'o 2419e92f48cSTheodore Ts'o if (((void *) header >= end) || 2429e92f48cSTheodore Ts'o (header->h_magic != le32_to_cpu(EXT4_XATTR_MAGIC))) 2439e92f48cSTheodore Ts'o goto errout; 2449e92f48cSTheodore Ts'o error = ext4_xattr_check_names(entry, end, entry); 2459e92f48cSTheodore Ts'o errout: 2469e92f48cSTheodore Ts'o if (error) 2479e92f48cSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, 2489e92f48cSTheodore Ts'o "corrupted in-inode xattr"); 2499e92f48cSTheodore Ts'o return error; 2509e92f48cSTheodore Ts'o } 2519e92f48cSTheodore Ts'o 2529e92f48cSTheodore Ts'o #define xattr_check_inode(inode, header, end) \ 2539e92f48cSTheodore Ts'o __xattr_check_inode((inode), (header), (end), __func__, __LINE__) 2549e92f48cSTheodore Ts'o 255ac27a0ecSDave Kleikamp static inline int 256617ba13bSMingming Cao ext4_xattr_check_entry(struct ext4_xattr_entry *entry, size_t size) 257ac27a0ecSDave Kleikamp { 258ac27a0ecSDave Kleikamp size_t value_size = le32_to_cpu(entry->e_value_size); 259ac27a0ecSDave Kleikamp 260ac27a0ecSDave Kleikamp if (entry->e_value_block != 0 || value_size > size || 261ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs) + value_size > size) 2626a797d27SDarrick J. Wong return -EFSCORRUPTED; 263ac27a0ecSDave Kleikamp return 0; 264ac27a0ecSDave Kleikamp } 265ac27a0ecSDave Kleikamp 266ac27a0ecSDave Kleikamp static int 267617ba13bSMingming Cao ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, 268ac27a0ecSDave Kleikamp const char *name, size_t size, int sorted) 269ac27a0ecSDave Kleikamp { 270617ba13bSMingming Cao struct ext4_xattr_entry *entry; 271ac27a0ecSDave Kleikamp size_t name_len; 272ac27a0ecSDave Kleikamp int cmp = 1; 273ac27a0ecSDave Kleikamp 274ac27a0ecSDave Kleikamp if (name == NULL) 275ac27a0ecSDave Kleikamp return -EINVAL; 276ac27a0ecSDave Kleikamp name_len = strlen(name); 277ac27a0ecSDave Kleikamp entry = *pentry; 278617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 279ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 280ac27a0ecSDave Kleikamp if (!cmp) 281ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 282ac27a0ecSDave Kleikamp if (!cmp) 283ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 284ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 285ac27a0ecSDave Kleikamp break; 286ac27a0ecSDave Kleikamp } 287ac27a0ecSDave Kleikamp *pentry = entry; 288617ba13bSMingming Cao if (!cmp && ext4_xattr_check_entry(entry, size)) 2896a797d27SDarrick J. Wong return -EFSCORRUPTED; 290ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 291ac27a0ecSDave Kleikamp } 292ac27a0ecSDave Kleikamp 293ac27a0ecSDave Kleikamp static int 294617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 295ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 296ac27a0ecSDave Kleikamp { 297ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 298617ba13bSMingming Cao struct ext4_xattr_entry *entry; 299ac27a0ecSDave Kleikamp size_t size; 300ac27a0ecSDave Kleikamp int error; 3017a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 302ac27a0ecSDave Kleikamp 303ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 304ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 305ac27a0ecSDave Kleikamp 306ac27a0ecSDave Kleikamp error = -ENODATA; 307617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 308ac27a0ecSDave Kleikamp goto cleanup; 309ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 310ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 311617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 312ac27a0ecSDave Kleikamp if (!bh) 313ac27a0ecSDave Kleikamp goto cleanup; 314ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 315ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 316cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 31712062dddSEric Sandeen bad_block: 31824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 319617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 3206a797d27SDarrick J. Wong error = -EFSCORRUPTED; 321ac27a0ecSDave Kleikamp goto cleanup; 322ac27a0ecSDave Kleikamp } 3239c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, bh); 324ac27a0ecSDave Kleikamp entry = BFIRST(bh); 325617ba13bSMingming Cao error = ext4_xattr_find_entry(&entry, name_index, name, bh->b_size, 1); 3266a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 327ac27a0ecSDave Kleikamp goto bad_block; 328ac27a0ecSDave Kleikamp if (error) 329ac27a0ecSDave Kleikamp goto cleanup; 330ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 331ac27a0ecSDave Kleikamp if (buffer) { 332ac27a0ecSDave Kleikamp error = -ERANGE; 333ac27a0ecSDave Kleikamp if (size > buffer_size) 334ac27a0ecSDave Kleikamp goto cleanup; 335ac27a0ecSDave Kleikamp memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs), 336ac27a0ecSDave Kleikamp size); 337ac27a0ecSDave Kleikamp } 338ac27a0ecSDave Kleikamp error = size; 339ac27a0ecSDave Kleikamp 340ac27a0ecSDave Kleikamp cleanup: 341ac27a0ecSDave Kleikamp brelse(bh); 342ac27a0ecSDave Kleikamp return error; 343ac27a0ecSDave Kleikamp } 344ac27a0ecSDave Kleikamp 345879b3825STao Ma int 346617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 347ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 348ac27a0ecSDave Kleikamp { 349617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 350617ba13bSMingming Cao struct ext4_xattr_entry *entry; 351617ba13bSMingming Cao struct ext4_inode *raw_inode; 352617ba13bSMingming Cao struct ext4_iloc iloc; 353ac27a0ecSDave Kleikamp size_t size; 354ac27a0ecSDave Kleikamp void *end; 355ac27a0ecSDave Kleikamp int error; 356ac27a0ecSDave Kleikamp 35719f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 358ac27a0ecSDave Kleikamp return -ENODATA; 359617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 360ac27a0ecSDave Kleikamp if (error) 361ac27a0ecSDave Kleikamp return error; 362617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 363ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 364ac27a0ecSDave Kleikamp entry = IFIRST(header); 365617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 3669e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 367ac27a0ecSDave Kleikamp if (error) 368ac27a0ecSDave Kleikamp goto cleanup; 369617ba13bSMingming Cao error = ext4_xattr_find_entry(&entry, name_index, name, 370ac27a0ecSDave Kleikamp end - (void *)entry, 0); 371ac27a0ecSDave Kleikamp if (error) 372ac27a0ecSDave Kleikamp goto cleanup; 373ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 374ac27a0ecSDave Kleikamp if (buffer) { 375ac27a0ecSDave Kleikamp error = -ERANGE; 376ac27a0ecSDave Kleikamp if (size > buffer_size) 377ac27a0ecSDave Kleikamp goto cleanup; 378ac27a0ecSDave Kleikamp memcpy(buffer, (void *)IFIRST(header) + 379ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs), size); 380ac27a0ecSDave Kleikamp } 381ac27a0ecSDave Kleikamp error = size; 382ac27a0ecSDave Kleikamp 383ac27a0ecSDave Kleikamp cleanup: 384ac27a0ecSDave Kleikamp brelse(iloc.bh); 385ac27a0ecSDave Kleikamp return error; 386ac27a0ecSDave Kleikamp } 387ac27a0ecSDave Kleikamp 388ac27a0ecSDave Kleikamp /* 389617ba13bSMingming Cao * ext4_xattr_get() 390ac27a0ecSDave Kleikamp * 391ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 392ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 393ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 394ac27a0ecSDave Kleikamp * 395ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 396ac27a0ecSDave Kleikamp * used / required on success. 397ac27a0ecSDave Kleikamp */ 398ac27a0ecSDave Kleikamp int 399617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 400ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 401ac27a0ecSDave Kleikamp { 402ac27a0ecSDave Kleikamp int error; 403ac27a0ecSDave Kleikamp 404230b8c1aSZhang Zhen if (strlen(name) > 255) 405230b8c1aSZhang Zhen return -ERANGE; 406230b8c1aSZhang Zhen 407617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 408617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 409ac27a0ecSDave Kleikamp buffer_size); 410ac27a0ecSDave Kleikamp if (error == -ENODATA) 411617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 412ac27a0ecSDave Kleikamp buffer_size); 413617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 414ac27a0ecSDave Kleikamp return error; 415ac27a0ecSDave Kleikamp } 416ac27a0ecSDave Kleikamp 417ac27a0ecSDave Kleikamp static int 418431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 419ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 420ac27a0ecSDave Kleikamp { 421ac27a0ecSDave Kleikamp size_t rest = buffer_size; 422ac27a0ecSDave Kleikamp 423617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 42411e27528SStephen Hemminger const struct xattr_handler *handler = 425617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 426ac27a0ecSDave Kleikamp 427764a5c6bSAndreas Gruenbacher if (handler && (!handler->list || handler->list(dentry))) { 428764a5c6bSAndreas Gruenbacher const char *prefix = handler->prefix ?: handler->name; 429764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 430764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 431764a5c6bSAndreas Gruenbacher 432ac27a0ecSDave Kleikamp if (buffer) { 433ac27a0ecSDave Kleikamp if (size > rest) 434ac27a0ecSDave Kleikamp return -ERANGE; 435764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 436764a5c6bSAndreas Gruenbacher buffer += prefix_len; 437764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 438764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 439764a5c6bSAndreas Gruenbacher *buffer++ = 0; 440ac27a0ecSDave Kleikamp } 441ac27a0ecSDave Kleikamp rest -= size; 442ac27a0ecSDave Kleikamp } 443ac27a0ecSDave Kleikamp } 444764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 445ac27a0ecSDave Kleikamp } 446ac27a0ecSDave Kleikamp 447ac27a0ecSDave Kleikamp static int 448431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 449ac27a0ecSDave Kleikamp { 4502b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 451ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 452ac27a0ecSDave Kleikamp int error; 4537a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 454ac27a0ecSDave Kleikamp 455ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 456ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 457ac27a0ecSDave Kleikamp 458ac27a0ecSDave Kleikamp error = 0; 459617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 460ac27a0ecSDave Kleikamp goto cleanup; 461ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 462ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 463617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 464ac27a0ecSDave Kleikamp error = -EIO; 465ac27a0ecSDave Kleikamp if (!bh) 466ac27a0ecSDave Kleikamp goto cleanup; 467ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 468ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 469cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 47024676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 471617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 4726a797d27SDarrick J. Wong error = -EFSCORRUPTED; 473ac27a0ecSDave Kleikamp goto cleanup; 474ac27a0ecSDave Kleikamp } 4759c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, bh); 476431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); 477ac27a0ecSDave Kleikamp 478ac27a0ecSDave Kleikamp cleanup: 479ac27a0ecSDave Kleikamp brelse(bh); 480ac27a0ecSDave Kleikamp 481ac27a0ecSDave Kleikamp return error; 482ac27a0ecSDave Kleikamp } 483ac27a0ecSDave Kleikamp 484ac27a0ecSDave Kleikamp static int 485431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 486ac27a0ecSDave Kleikamp { 4872b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 488617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 489617ba13bSMingming Cao struct ext4_inode *raw_inode; 490617ba13bSMingming Cao struct ext4_iloc iloc; 491ac27a0ecSDave Kleikamp void *end; 492ac27a0ecSDave Kleikamp int error; 493ac27a0ecSDave Kleikamp 49419f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 495ac27a0ecSDave Kleikamp return 0; 496617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 497ac27a0ecSDave Kleikamp if (error) 498ac27a0ecSDave Kleikamp return error; 499617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 500ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 501617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 5029e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 503ac27a0ecSDave Kleikamp if (error) 504ac27a0ecSDave Kleikamp goto cleanup; 505431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 506ac27a0ecSDave Kleikamp buffer, buffer_size); 507ac27a0ecSDave Kleikamp 508ac27a0ecSDave Kleikamp cleanup: 509ac27a0ecSDave Kleikamp brelse(iloc.bh); 510ac27a0ecSDave Kleikamp return error; 511ac27a0ecSDave Kleikamp } 512ac27a0ecSDave Kleikamp 513ac27a0ecSDave Kleikamp /* 514617ba13bSMingming Cao * ext4_xattr_list() 515ac27a0ecSDave Kleikamp * 516ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 517ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 518ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 519ac27a0ecSDave Kleikamp * 520ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 521ac27a0ecSDave Kleikamp * used / required on success. 522ac27a0ecSDave Kleikamp */ 523d3a95d47SMingming Cao static int 524431547b3SChristoph Hellwig ext4_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size) 525ac27a0ecSDave Kleikamp { 526eaeef867STheodore Ts'o int ret, ret2; 527ac27a0ecSDave Kleikamp 5282b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 529eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 530eaeef867STheodore Ts'o if (ret < 0) 531eaeef867STheodore Ts'o goto errout; 532ac27a0ecSDave Kleikamp if (buffer) { 533eaeef867STheodore Ts'o buffer += ret; 534eaeef867STheodore Ts'o buffer_size -= ret; 535ac27a0ecSDave Kleikamp } 536eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 537eaeef867STheodore Ts'o if (ret < 0) 538eaeef867STheodore Ts'o goto errout; 539eaeef867STheodore Ts'o ret += ret2; 540eaeef867STheodore Ts'o errout: 5412b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 542eaeef867STheodore Ts'o return ret; 543ac27a0ecSDave Kleikamp } 544ac27a0ecSDave Kleikamp 545ac27a0ecSDave Kleikamp /* 546617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 547ac27a0ecSDave Kleikamp * not set, set it. 548ac27a0ecSDave Kleikamp */ 549617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 550ac27a0ecSDave Kleikamp struct super_block *sb) 551ac27a0ecSDave Kleikamp { 552e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 553ac27a0ecSDave Kleikamp return; 554ac27a0ecSDave Kleikamp 5555d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 556617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 557e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 558a0375156STheodore Ts'o ext4_handle_dirty_super(handle, sb); 559ac27a0ecSDave Kleikamp } 560ac27a0ecSDave Kleikamp } 561ac27a0ecSDave Kleikamp 562ac27a0ecSDave Kleikamp /* 563ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 564ec4cb1aaSJan Kara * otherwise free the block. 565ac27a0ecSDave Kleikamp */ 566ac27a0ecSDave Kleikamp static void 567617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 568ac27a0ecSDave Kleikamp struct buffer_head *bh) 569ac27a0ecSDave Kleikamp { 5706048c64bSAndreas Gruenbacher struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 5716048c64bSAndreas Gruenbacher u32 hash, ref; 5728a2bfdcbSMingming Cao int error = 0; 573ac27a0ecSDave Kleikamp 5745d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 5758a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 5768a2bfdcbSMingming Cao if (error) 5778a2bfdcbSMingming Cao goto out; 5788a2bfdcbSMingming Cao 5798a2bfdcbSMingming Cao lock_buffer(bh); 5806048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 5816048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 5826048c64bSAndreas Gruenbacher if (ref == 1) { 583ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 58482939d79SJan Kara /* 58582939d79SJan Kara * This must happen under buffer lock for 58682939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 58782939d79SJan Kara */ 5886048c64bSAndreas Gruenbacher mb_cache_entry_delete_block(ext4_mb_cache, hash, bh->b_blocknr); 589ac27a0ecSDave Kleikamp get_bh(bh); 590ec4cb1aaSJan Kara unlock_buffer(bh); 591e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 592e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 593e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 594ac27a0ecSDave Kleikamp } else { 5956048c64bSAndreas Gruenbacher ref--; 5966048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 5976048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 5986048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 5996048c64bSAndreas Gruenbacher 6006048c64bSAndreas Gruenbacher ce = mb_cache_entry_get(ext4_mb_cache, hash, 6016048c64bSAndreas Gruenbacher bh->b_blocknr); 6026048c64bSAndreas Gruenbacher if (ce) { 6036048c64bSAndreas Gruenbacher ce->e_reusable = 1; 6046048c64bSAndreas Gruenbacher mb_cache_entry_put(ext4_mb_cache, ce); 6056048c64bSAndreas Gruenbacher } 6066048c64bSAndreas Gruenbacher } 6076048c64bSAndreas Gruenbacher 608ec4cb1aaSJan Kara /* 609ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 610ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 611ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 612ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 613ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 614ec4cb1aaSJan Kara * call ext4_handle_dirty_xattr_block() with locked buffer as 615ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 616ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 617ec4cb1aaSJan Kara */ 618ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 619ec4cb1aaSJan Kara error = ext4_handle_dirty_xattr_block(handle, inode, 620ec4cb1aaSJan Kara bh); 621c1bb05a6SEric Sandeen unlock_buffer(bh); 622ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 623ec4cb1aaSJan Kara error = ext4_handle_dirty_xattr_block(handle, inode, 624ec4cb1aaSJan Kara bh); 625ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 6260390131bSFrank Mayhar ext4_handle_sync(handle); 6271231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 628ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 629ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 630ac27a0ecSDave Kleikamp } 6318a2bfdcbSMingming Cao out: 6328a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 6338a2bfdcbSMingming Cao return; 634ac27a0ecSDave Kleikamp } 635ac27a0ecSDave Kleikamp 6366dd4ee7cSKalpak Shah /* 6376dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 6386dd4ee7cSKalpak Shah * bytes used by EA entries. 6396dd4ee7cSKalpak Shah */ 6406dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 6416dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 6426dd4ee7cSKalpak Shah { 6436dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 6446dd4ee7cSKalpak Shah if (!last->e_value_block && last->e_value_size) { 6456dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 6466dd4ee7cSKalpak Shah if (offs < *min_offs) 6476dd4ee7cSKalpak Shah *min_offs = offs; 6486dd4ee7cSKalpak Shah } 6497b1b2c1bSTheodore Ts'o if (total) 6507b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 6516dd4ee7cSKalpak Shah } 6526dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 6536dd4ee7cSKalpak Shah } 6546dd4ee7cSKalpak Shah 655ac27a0ecSDave Kleikamp static int 656617ba13bSMingming Cao ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s) 657ac27a0ecSDave Kleikamp { 658617ba13bSMingming Cao struct ext4_xattr_entry *last; 659ac27a0ecSDave Kleikamp size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); 660ac27a0ecSDave Kleikamp 661ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 662ac27a0ecSDave Kleikamp last = s->first; 663617ba13bSMingming Cao for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 664ac27a0ecSDave Kleikamp if (!last->e_value_block && last->e_value_size) { 665ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 666ac27a0ecSDave Kleikamp if (offs < min_offs) 667ac27a0ecSDave Kleikamp min_offs = offs; 668ac27a0ecSDave Kleikamp } 669ac27a0ecSDave Kleikamp } 670ac27a0ecSDave Kleikamp free = min_offs - ((void *)last - s->base) - sizeof(__u32); 671ac27a0ecSDave Kleikamp if (!s->not_found) { 672ac27a0ecSDave Kleikamp if (!s->here->e_value_block && s->here->e_value_size) { 673ac27a0ecSDave Kleikamp size_t size = le32_to_cpu(s->here->e_value_size); 674617ba13bSMingming Cao free += EXT4_XATTR_SIZE(size); 675ac27a0ecSDave Kleikamp } 676617ba13bSMingming Cao free += EXT4_XATTR_LEN(name_len); 677ac27a0ecSDave Kleikamp } 678ac27a0ecSDave Kleikamp if (i->value) { 6795f80f62aSWei Yuan if (free < EXT4_XATTR_LEN(name_len) + 680617ba13bSMingming Cao EXT4_XATTR_SIZE(i->value_len)) 681ac27a0ecSDave Kleikamp return -ENOSPC; 682ac27a0ecSDave Kleikamp } 683ac27a0ecSDave Kleikamp 684ac27a0ecSDave Kleikamp if (i->value && s->not_found) { 685ac27a0ecSDave Kleikamp /* Insert the new name. */ 686617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 687ac27a0ecSDave Kleikamp size_t rest = (void *)last - (void *)s->here + sizeof(__u32); 688ac27a0ecSDave Kleikamp memmove((void *)s->here + size, s->here, rest); 689ac27a0ecSDave Kleikamp memset(s->here, 0, size); 690ac27a0ecSDave Kleikamp s->here->e_name_index = i->name_index; 691ac27a0ecSDave Kleikamp s->here->e_name_len = name_len; 692ac27a0ecSDave Kleikamp memcpy(s->here->e_name, i->name, name_len); 693ac27a0ecSDave Kleikamp } else { 694ac27a0ecSDave Kleikamp if (!s->here->e_value_block && s->here->e_value_size) { 695ac27a0ecSDave Kleikamp void *first_val = s->base + min_offs; 696ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(s->here->e_value_offs); 697ac27a0ecSDave Kleikamp void *val = s->base + offs; 698617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE( 699ac27a0ecSDave Kleikamp le32_to_cpu(s->here->e_value_size)); 700ac27a0ecSDave Kleikamp 701617ba13bSMingming Cao if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { 702ac27a0ecSDave Kleikamp /* The old and the new value have the same 703ac27a0ecSDave Kleikamp size. Just replace. */ 704ac27a0ecSDave Kleikamp s->here->e_value_size = 705ac27a0ecSDave Kleikamp cpu_to_le32(i->value_len); 706bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 707bd9926e8STheodore Ts'o memset(val, 0, size); 708bd9926e8STheodore Ts'o } else { 709bd9926e8STheodore Ts'o /* Clear pad bytes first. */ 710617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 711bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 712ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 713bd9926e8STheodore Ts'o } 714ac27a0ecSDave Kleikamp return 0; 715ac27a0ecSDave Kleikamp } 716ac27a0ecSDave Kleikamp 717ac27a0ecSDave Kleikamp /* Remove the old value. */ 718ac27a0ecSDave Kleikamp memmove(first_val + size, first_val, val - first_val); 719ac27a0ecSDave Kleikamp memset(first_val, 0, size); 720ac27a0ecSDave Kleikamp s->here->e_value_size = 0; 721ac27a0ecSDave Kleikamp s->here->e_value_offs = 0; 722ac27a0ecSDave Kleikamp min_offs += size; 723ac27a0ecSDave Kleikamp 724ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 725ac27a0ecSDave Kleikamp last = s->first; 726ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 727ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 728ac27a0ecSDave Kleikamp if (!last->e_value_block && 729ac27a0ecSDave Kleikamp last->e_value_size && o < offs) 730ac27a0ecSDave Kleikamp last->e_value_offs = 731ac27a0ecSDave Kleikamp cpu_to_le16(o + size); 732617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 733ac27a0ecSDave Kleikamp } 734ac27a0ecSDave Kleikamp } 735ac27a0ecSDave Kleikamp if (!i->value) { 736ac27a0ecSDave Kleikamp /* Remove the old name. */ 737617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 738ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 739ac27a0ecSDave Kleikamp memmove(s->here, (void *)s->here + size, 740ac27a0ecSDave Kleikamp (void *)last - (void *)s->here + sizeof(__u32)); 741ac27a0ecSDave Kleikamp memset(last, 0, size); 742ac27a0ecSDave Kleikamp } 743ac27a0ecSDave Kleikamp } 744ac27a0ecSDave Kleikamp 745ac27a0ecSDave Kleikamp if (i->value) { 746ac27a0ecSDave Kleikamp /* Insert the new value. */ 747ac27a0ecSDave Kleikamp s->here->e_value_size = cpu_to_le32(i->value_len); 748ac27a0ecSDave Kleikamp if (i->value_len) { 749617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE(i->value_len); 750ac27a0ecSDave Kleikamp void *val = s->base + min_offs - size; 751ac27a0ecSDave Kleikamp s->here->e_value_offs = cpu_to_le16(min_offs - size); 752bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 753bd9926e8STheodore Ts'o memset(val, 0, size); 754bd9926e8STheodore Ts'o } else { 755bd9926e8STheodore Ts'o /* Clear the pad bytes first. */ 756617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 757bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 758ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 759ac27a0ecSDave Kleikamp } 760ac27a0ecSDave Kleikamp } 761bd9926e8STheodore Ts'o } 762ac27a0ecSDave Kleikamp return 0; 763ac27a0ecSDave Kleikamp } 764ac27a0ecSDave Kleikamp 765617ba13bSMingming Cao struct ext4_xattr_block_find { 766617ba13bSMingming Cao struct ext4_xattr_search s; 767ac27a0ecSDave Kleikamp struct buffer_head *bh; 768ac27a0ecSDave Kleikamp }; 769ac27a0ecSDave Kleikamp 770ac27a0ecSDave Kleikamp static int 771617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 772617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 773ac27a0ecSDave Kleikamp { 774ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 775ac27a0ecSDave Kleikamp int error; 776ac27a0ecSDave Kleikamp 777ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 778ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 779ac27a0ecSDave Kleikamp 780617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 781ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 782617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 783ac27a0ecSDave Kleikamp error = -EIO; 784ac27a0ecSDave Kleikamp if (!bs->bh) 785ac27a0ecSDave Kleikamp goto cleanup; 786ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 787ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 788ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 789cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bs->bh)) { 79024676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 79124676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 7926a797d27SDarrick J. Wong error = -EFSCORRUPTED; 793ac27a0ecSDave Kleikamp goto cleanup; 794ac27a0ecSDave Kleikamp } 795ac27a0ecSDave Kleikamp /* Find the named attribute. */ 796ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 797ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 798ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 799ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 800617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 801ac27a0ecSDave Kleikamp i->name, bs->bh->b_size, 1); 802ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 803ac27a0ecSDave Kleikamp goto cleanup; 804ac27a0ecSDave Kleikamp bs->s.not_found = error; 805ac27a0ecSDave Kleikamp } 806ac27a0ecSDave Kleikamp error = 0; 807ac27a0ecSDave Kleikamp 808ac27a0ecSDave Kleikamp cleanup: 809ac27a0ecSDave Kleikamp return error; 810ac27a0ecSDave Kleikamp } 811ac27a0ecSDave Kleikamp 812ac27a0ecSDave Kleikamp static int 813617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 814617ba13bSMingming Cao struct ext4_xattr_info *i, 815617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 816ac27a0ecSDave Kleikamp { 817ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 818ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 819617ba13bSMingming Cao struct ext4_xattr_search *s = &bs->s; 8207a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 8218a2bfdcbSMingming Cao int error = 0; 8227a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 823ac27a0ecSDave Kleikamp 824617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 825ac27a0ecSDave Kleikamp 826ac27a0ecSDave Kleikamp if (i->value && i->value_len > sb->s_blocksize) 827ac27a0ecSDave Kleikamp return -ENOSPC; 828ac27a0ecSDave Kleikamp if (s->base) { 8295d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 8308a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 8318a2bfdcbSMingming Cao if (error) 8328a2bfdcbSMingming Cao goto cleanup; 8338a2bfdcbSMingming Cao lock_buffer(bs->bh); 8348a2bfdcbSMingming Cao 835ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 83682939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 83782939d79SJan Kara 83882939d79SJan Kara /* 83982939d79SJan Kara * This must happen under buffer lock for 84082939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 84182939d79SJan Kara * block 84282939d79SJan Kara */ 8437a2508e1SJan Kara mb_cache_entry_delete_block(ext4_mb_cache, hash, 84482939d79SJan Kara bs->bh->b_blocknr); 845ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 846617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 847ac27a0ecSDave Kleikamp if (!error) { 848ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 849617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), 850ac27a0ecSDave Kleikamp s->here); 8519c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, 8529c191f70ST Makphaibulchoke bs->bh); 853ac27a0ecSDave Kleikamp } 854ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 8556a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 856ac27a0ecSDave Kleikamp goto bad_block; 857ac27a0ecSDave Kleikamp if (!error) 858cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 8590390131bSFrank Mayhar inode, 860ac27a0ecSDave Kleikamp bs->bh); 861ac27a0ecSDave Kleikamp if (error) 862ac27a0ecSDave Kleikamp goto cleanup; 863ac27a0ecSDave Kleikamp goto inserted; 864ac27a0ecSDave Kleikamp } else { 865ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 866ac27a0ecSDave Kleikamp 8678a2bfdcbSMingming Cao unlock_buffer(bs->bh); 868ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 869216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 870ac27a0ecSDave Kleikamp error = -ENOMEM; 871ac27a0ecSDave Kleikamp if (s->base == NULL) 872ac27a0ecSDave Kleikamp goto cleanup; 873ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 874ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 875ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 876ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 877ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 878ac27a0ecSDave Kleikamp } 879ac27a0ecSDave Kleikamp } else { 880ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 881216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 882ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 883ac27a0ecSDave Kleikamp error = -ENOMEM; 884ac27a0ecSDave Kleikamp if (s->base == NULL) 885ac27a0ecSDave Kleikamp goto cleanup; 886617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 887ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 888ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 889ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 890ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 891ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 892ac27a0ecSDave Kleikamp } 893ac27a0ecSDave Kleikamp 894617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 8956a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 896ac27a0ecSDave Kleikamp goto bad_block; 897ac27a0ecSDave Kleikamp if (error) 898ac27a0ecSDave Kleikamp goto cleanup; 899ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 900617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), s->here); 901ac27a0ecSDave Kleikamp 902ac27a0ecSDave Kleikamp inserted: 903ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 904617ba13bSMingming Cao new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); 905ac27a0ecSDave Kleikamp if (new_bh) { 906ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 907ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 908ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 909ac27a0ecSDave Kleikamp else { 9106048c64bSAndreas Gruenbacher u32 ref; 9116048c64bSAndreas Gruenbacher 912ac27a0ecSDave Kleikamp /* The old block is released after updating 913ac27a0ecSDave Kleikamp the inode. */ 9141231b3a1SLukas Czerner error = dquot_alloc_block(inode, 9151231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 9165dd4056dSChristoph Hellwig if (error) 917ac27a0ecSDave Kleikamp goto cleanup; 9185d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 919617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 920ac27a0ecSDave Kleikamp new_bh); 921ac27a0ecSDave Kleikamp if (error) 922ac27a0ecSDave Kleikamp goto cleanup_dquot; 923ac27a0ecSDave Kleikamp lock_buffer(new_bh); 92482939d79SJan Kara /* 92582939d79SJan Kara * We have to be careful about races with 9266048c64bSAndreas Gruenbacher * freeing, rehashing or adding references to 9276048c64bSAndreas Gruenbacher * xattr block. Once we hold buffer lock xattr 9286048c64bSAndreas Gruenbacher * block's state is stable so we can check 9296048c64bSAndreas Gruenbacher * whether the block got freed / rehashed or 9306048c64bSAndreas Gruenbacher * not. Since we unhash mbcache entry under 9316048c64bSAndreas Gruenbacher * buffer lock when freeing / rehashing xattr 9326048c64bSAndreas Gruenbacher * block, checking whether entry is still 9336048c64bSAndreas Gruenbacher * hashed is reliable. Same rules hold for 9346048c64bSAndreas Gruenbacher * e_reusable handling. 93582939d79SJan Kara */ 9366048c64bSAndreas Gruenbacher if (hlist_bl_unhashed(&ce->e_hash_list) || 9376048c64bSAndreas Gruenbacher !ce->e_reusable) { 93882939d79SJan Kara /* 93982939d79SJan Kara * Undo everything and check mbcache 94082939d79SJan Kara * again. 94182939d79SJan Kara */ 94282939d79SJan Kara unlock_buffer(new_bh); 94382939d79SJan Kara dquot_free_block(inode, 94482939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 94582939d79SJan Kara 1)); 94682939d79SJan Kara brelse(new_bh); 9477a2508e1SJan Kara mb_cache_entry_put(ext4_mb_cache, ce); 94882939d79SJan Kara ce = NULL; 94982939d79SJan Kara new_bh = NULL; 95082939d79SJan Kara goto inserted; 95182939d79SJan Kara } 9526048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 9536048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 9546048c64bSAndreas Gruenbacher if (ref >= EXT4_XATTR_REFCOUNT_MAX) 9556048c64bSAndreas Gruenbacher ce->e_reusable = 0; 956ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 9576048c64bSAndreas Gruenbacher ref); 958ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 959cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 9600390131bSFrank Mayhar inode, 961ac27a0ecSDave Kleikamp new_bh); 962ac27a0ecSDave Kleikamp if (error) 963ac27a0ecSDave Kleikamp goto cleanup_dquot; 964ac27a0ecSDave Kleikamp } 9657a2508e1SJan Kara mb_cache_entry_touch(ext4_mb_cache, ce); 9667a2508e1SJan Kara mb_cache_entry_put(ext4_mb_cache, ce); 967ac27a0ecSDave Kleikamp ce = NULL; 968ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 969ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 970ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 971ac27a0ecSDave Kleikamp new_bh = bs->bh; 972ac27a0ecSDave Kleikamp get_bh(new_bh); 973ac27a0ecSDave Kleikamp } else { 974ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 975fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 976fb0a387dSEric Sandeen 977fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 978d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 979fb0a387dSEric Sandeen 980fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 98112e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 982fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 983fb0a387dSEric Sandeen 98455f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 98555f020dbSAllison Henderson NULL, &error); 986ac27a0ecSDave Kleikamp if (error) 987ac27a0ecSDave Kleikamp goto cleanup; 988fb0a387dSEric Sandeen 98912e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 990fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 991fb0a387dSEric Sandeen 992ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 993ace36ad4SJoe Perches (unsigned long long)block); 994ac27a0ecSDave Kleikamp 995ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 996aebf0243SWang Shilong if (unlikely(!new_bh)) { 997860d21e2STheodore Ts'o error = -ENOMEM; 998ac27a0ecSDave Kleikamp getblk_failed: 9997dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 1000e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 1001ac27a0ecSDave Kleikamp goto cleanup; 1002ac27a0ecSDave Kleikamp } 1003ac27a0ecSDave Kleikamp lock_buffer(new_bh); 1004617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 1005ac27a0ecSDave Kleikamp if (error) { 1006ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 1007860d21e2STheodore Ts'o error = -EIO; 1008ac27a0ecSDave Kleikamp goto getblk_failed; 1009ac27a0ecSDave Kleikamp } 1010ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 1011ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 1012ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 10139c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, new_bh); 1014cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 10150390131bSFrank Mayhar inode, new_bh); 1016ac27a0ecSDave Kleikamp if (error) 1017ac27a0ecSDave Kleikamp goto cleanup; 1018ac27a0ecSDave Kleikamp } 1019ac27a0ecSDave Kleikamp } 1020ac27a0ecSDave Kleikamp 1021ac27a0ecSDave Kleikamp /* Update the inode. */ 1022617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 1023ac27a0ecSDave Kleikamp 1024ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 1025ac27a0ecSDave Kleikamp if (bs->bh && bs->bh != new_bh) 1026617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bs->bh); 1027ac27a0ecSDave Kleikamp error = 0; 1028ac27a0ecSDave Kleikamp 1029ac27a0ecSDave Kleikamp cleanup: 1030ac27a0ecSDave Kleikamp if (ce) 10317a2508e1SJan Kara mb_cache_entry_put(ext4_mb_cache, ce); 1032ac27a0ecSDave Kleikamp brelse(new_bh); 1033ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 1034ac27a0ecSDave Kleikamp kfree(s->base); 1035ac27a0ecSDave Kleikamp 1036ac27a0ecSDave Kleikamp return error; 1037ac27a0ecSDave Kleikamp 1038ac27a0ecSDave Kleikamp cleanup_dquot: 10391231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 1040ac27a0ecSDave Kleikamp goto cleanup; 1041ac27a0ecSDave Kleikamp 1042ac27a0ecSDave Kleikamp bad_block: 104324676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 104424676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1045ac27a0ecSDave Kleikamp goto cleanup; 1046ac27a0ecSDave Kleikamp 1047ac27a0ecSDave Kleikamp #undef header 1048ac27a0ecSDave Kleikamp } 1049ac27a0ecSDave Kleikamp 1050879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 1051617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 1052ac27a0ecSDave Kleikamp { 1053617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 1054617ba13bSMingming Cao struct ext4_inode *raw_inode; 1055ac27a0ecSDave Kleikamp int error; 1056ac27a0ecSDave Kleikamp 1057617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 1058ac27a0ecSDave Kleikamp return 0; 1059617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 1060ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 1061ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 1062ac27a0ecSDave Kleikamp is->s.here = is->s.first; 1063617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 106419f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 10659e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 1066ac27a0ecSDave Kleikamp if (error) 1067ac27a0ecSDave Kleikamp return error; 1068ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1069617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 1070ac27a0ecSDave Kleikamp i->name, is->s.end - 1071ac27a0ecSDave Kleikamp (void *)is->s.base, 0); 1072ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1073ac27a0ecSDave Kleikamp return error; 1074ac27a0ecSDave Kleikamp is->s.not_found = error; 1075ac27a0ecSDave Kleikamp } 1076ac27a0ecSDave Kleikamp return 0; 1077ac27a0ecSDave Kleikamp } 1078ac27a0ecSDave Kleikamp 10790d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 10800d812f77STao Ma struct ext4_xattr_info *i, 10810d812f77STao Ma struct ext4_xattr_ibody_find *is) 10820d812f77STao Ma { 10830d812f77STao Ma struct ext4_xattr_ibody_header *header; 10840d812f77STao Ma struct ext4_xattr_search *s = &is->s; 10850d812f77STao Ma int error; 10860d812f77STao Ma 10870d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 10880d812f77STao Ma return -ENOSPC; 10890d812f77STao Ma error = ext4_xattr_set_entry(i, s); 10900d812f77STao Ma if (error) { 10910d812f77STao Ma if (error == -ENOSPC && 10920d812f77STao Ma ext4_has_inline_data(inode)) { 10930d812f77STao Ma error = ext4_try_to_evict_inline_data(handle, inode, 10940d812f77STao Ma EXT4_XATTR_LEN(strlen(i->name) + 10950d812f77STao Ma EXT4_XATTR_SIZE(i->value_len))); 10960d812f77STao Ma if (error) 10970d812f77STao Ma return error; 10980d812f77STao Ma error = ext4_xattr_ibody_find(inode, i, is); 10990d812f77STao Ma if (error) 11000d812f77STao Ma return error; 11010d812f77STao Ma error = ext4_xattr_set_entry(i, s); 11020d812f77STao Ma } 11030d812f77STao Ma if (error) 11040d812f77STao Ma return error; 11050d812f77STao Ma } 11060d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 11070d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 11080d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 11090d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 11100d812f77STao Ma } else { 11110d812f77STao Ma header->h_magic = cpu_to_le32(0); 11120d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 11130d812f77STao Ma } 11140d812f77STao Ma return 0; 11150d812f77STao Ma } 11160d812f77STao Ma 11170d812f77STao Ma static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 1118617ba13bSMingming Cao struct ext4_xattr_info *i, 1119617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 1120ac27a0ecSDave Kleikamp { 1121617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 1122617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 1123ac27a0ecSDave Kleikamp int error; 1124ac27a0ecSDave Kleikamp 1125617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 1126ac27a0ecSDave Kleikamp return -ENOSPC; 1127617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 1128ac27a0ecSDave Kleikamp if (error) 1129ac27a0ecSDave Kleikamp return error; 1130617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 1131ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 1132617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 113319f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 1134ac27a0ecSDave Kleikamp } else { 1135ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 113619f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 1137ac27a0ecSDave Kleikamp } 1138ac27a0ecSDave Kleikamp return 0; 1139ac27a0ecSDave Kleikamp } 1140ac27a0ecSDave Kleikamp 11413fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 11423fd16462SJan Kara struct ext4_xattr_info *i) 11433fd16462SJan Kara { 11443fd16462SJan Kara void *value; 11453fd16462SJan Kara 11463fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 11473fd16462SJan Kara return 0; 11483fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 11493fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 11503fd16462SJan Kara } 11513fd16462SJan Kara 1152ac27a0ecSDave Kleikamp /* 1153617ba13bSMingming Cao * ext4_xattr_set_handle() 1154ac27a0ecSDave Kleikamp * 11556e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 1156ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 1157ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 1158ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 1159ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 1160ac27a0ecSDave Kleikamp * previous to the call, respectively. 1161ac27a0ecSDave Kleikamp * 1162ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1163ac27a0ecSDave Kleikamp */ 1164ac27a0ecSDave Kleikamp int 1165617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 1166ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 1167ac27a0ecSDave Kleikamp int flags) 1168ac27a0ecSDave Kleikamp { 1169617ba13bSMingming Cao struct ext4_xattr_info i = { 1170ac27a0ecSDave Kleikamp .name_index = name_index, 1171ac27a0ecSDave Kleikamp .name = name, 1172ac27a0ecSDave Kleikamp .value = value, 1173ac27a0ecSDave Kleikamp .value_len = value_len, 1174ac27a0ecSDave Kleikamp 1175ac27a0ecSDave Kleikamp }; 1176617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 1177ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1178ac27a0ecSDave Kleikamp }; 1179617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 1180ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1181ac27a0ecSDave Kleikamp }; 11824d20c685SKalpak Shah unsigned long no_expand; 1183ac27a0ecSDave Kleikamp int error; 1184ac27a0ecSDave Kleikamp 1185ac27a0ecSDave Kleikamp if (!name) 1186ac27a0ecSDave Kleikamp return -EINVAL; 1187ac27a0ecSDave Kleikamp if (strlen(name) > 255) 1188ac27a0ecSDave Kleikamp return -ERANGE; 1189617ba13bSMingming Cao down_write(&EXT4_I(inode)->xattr_sem); 119019f5fb7aSTheodore Ts'o no_expand = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND); 119119f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND); 11924d20c685SKalpak Shah 119366543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 119486ebfd08SEric Sandeen if (error) 119586ebfd08SEric Sandeen goto cleanup; 119686ebfd08SEric Sandeen 119719f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 1198617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 1199617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 120019f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 1201ac27a0ecSDave Kleikamp } 1202ac27a0ecSDave Kleikamp 1203617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 1204ac27a0ecSDave Kleikamp if (error) 1205ac27a0ecSDave Kleikamp goto cleanup; 1206ac27a0ecSDave Kleikamp if (is.s.not_found) 1207617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 1208ac27a0ecSDave Kleikamp if (error) 1209ac27a0ecSDave Kleikamp goto cleanup; 1210ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 1211ac27a0ecSDave Kleikamp error = -ENODATA; 1212ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 1213ac27a0ecSDave Kleikamp goto cleanup; 1214ac27a0ecSDave Kleikamp error = 0; 1215ac27a0ecSDave Kleikamp if (!value) 1216ac27a0ecSDave Kleikamp goto cleanup; 1217ac27a0ecSDave Kleikamp } else { 1218ac27a0ecSDave Kleikamp error = -EEXIST; 1219ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 1220ac27a0ecSDave Kleikamp goto cleanup; 1221ac27a0ecSDave Kleikamp } 1222ac27a0ecSDave Kleikamp if (!value) { 1223ac27a0ecSDave Kleikamp if (!is.s.not_found) 1224617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1225ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 1226617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1227ac27a0ecSDave Kleikamp } else { 12283fd16462SJan Kara error = 0; 12293fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 12303fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 12313fd16462SJan Kara goto cleanup; 12323fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 12333fd16462SJan Kara goto cleanup; 12343fd16462SJan Kara 1235617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1236ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 1237ac27a0ecSDave Kleikamp i.value = NULL; 1238617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1239ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 12407e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 12417e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 12427e01c8e5STiger Yang if (error) 12437e01c8e5STiger Yang goto cleanup; 12447e01c8e5STiger Yang } 1245617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1246ac27a0ecSDave Kleikamp if (error) 1247ac27a0ecSDave Kleikamp goto cleanup; 1248ac27a0ecSDave Kleikamp if (!is.s.not_found) { 1249ac27a0ecSDave Kleikamp i.value = NULL; 1250617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, 1251ac27a0ecSDave Kleikamp &is); 1252ac27a0ecSDave Kleikamp } 1253ac27a0ecSDave Kleikamp } 1254ac27a0ecSDave Kleikamp } 1255ac27a0ecSDave Kleikamp if (!error) { 1256617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 1257ef7f3835SKalpak Shah inode->i_ctime = ext4_current_time(inode); 12586dd4ee7cSKalpak Shah if (!value) 125919f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); 1260617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 1261ac27a0ecSDave Kleikamp /* 1262617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 1263ac27a0ecSDave Kleikamp * error != 0. 1264ac27a0ecSDave Kleikamp */ 1265ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 1266ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 12670390131bSFrank Mayhar ext4_handle_sync(handle); 1268ac27a0ecSDave Kleikamp } 1269ac27a0ecSDave Kleikamp 1270ac27a0ecSDave Kleikamp cleanup: 1271ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 1272ac27a0ecSDave Kleikamp brelse(bs.bh); 12734d20c685SKalpak Shah if (no_expand == 0) 127419f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); 1275617ba13bSMingming Cao up_write(&EXT4_I(inode)->xattr_sem); 1276ac27a0ecSDave Kleikamp return error; 1277ac27a0ecSDave Kleikamp } 1278ac27a0ecSDave Kleikamp 1279ac27a0ecSDave Kleikamp /* 1280617ba13bSMingming Cao * ext4_xattr_set() 1281ac27a0ecSDave Kleikamp * 1282617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 1283ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 1284ac27a0ecSDave Kleikamp * 1285ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1286ac27a0ecSDave Kleikamp */ 1287ac27a0ecSDave Kleikamp int 1288617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 1289ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 1290ac27a0ecSDave Kleikamp { 1291ac27a0ecSDave Kleikamp handle_t *handle; 1292ac27a0ecSDave Kleikamp int error, retries = 0; 129395eaefbdSTheodore Ts'o int credits = ext4_jbd2_credits_xattr(inode); 1294ac27a0ecSDave Kleikamp 1295ac27a0ecSDave Kleikamp retry: 12969924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 1297ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 1298ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 1299ac27a0ecSDave Kleikamp } else { 1300ac27a0ecSDave Kleikamp int error2; 1301ac27a0ecSDave Kleikamp 1302617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 1303ac27a0ecSDave Kleikamp value, value_len, flags); 1304617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 1305ac27a0ecSDave Kleikamp if (error == -ENOSPC && 1306617ba13bSMingming Cao ext4_should_retry_alloc(inode->i_sb, &retries)) 1307ac27a0ecSDave Kleikamp goto retry; 1308ac27a0ecSDave Kleikamp if (error == 0) 1309ac27a0ecSDave Kleikamp error = error2; 1310ac27a0ecSDave Kleikamp } 1311ac27a0ecSDave Kleikamp 1312ac27a0ecSDave Kleikamp return error; 1313ac27a0ecSDave Kleikamp } 1314ac27a0ecSDave Kleikamp 1315ac27a0ecSDave Kleikamp /* 13166dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 13176dd4ee7cSKalpak Shah * i_extra_isize. 13186dd4ee7cSKalpak Shah */ 13196dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 13206dd4ee7cSKalpak Shah int value_offs_shift, void *to, 13216dd4ee7cSKalpak Shah void *from, size_t n, int blocksize) 13226dd4ee7cSKalpak Shah { 13236dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 13246dd4ee7cSKalpak Shah int new_offs; 13256dd4ee7cSKalpak Shah 13266dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 13276dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 13286dd4ee7cSKalpak Shah if (!last->e_value_block && last->e_value_size) { 13296dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 13306dd4ee7cSKalpak Shah value_offs_shift; 13316dd4ee7cSKalpak Shah BUG_ON(new_offs + le32_to_cpu(last->e_value_size) 13326dd4ee7cSKalpak Shah > blocksize); 13336dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 13346dd4ee7cSKalpak Shah } 13356dd4ee7cSKalpak Shah } 13366dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 13376dd4ee7cSKalpak Shah memmove(to, from, n); 13386dd4ee7cSKalpak Shah } 13396dd4ee7cSKalpak Shah 13406dd4ee7cSKalpak Shah /* 13416dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 13426dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 13436dd4ee7cSKalpak Shah */ 13446dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 13456dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 13466dd4ee7cSKalpak Shah { 13476dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 13486dd4ee7cSKalpak Shah struct ext4_xattr_entry *entry, *last, *first; 13496dd4ee7cSKalpak Shah struct buffer_head *bh = NULL; 13506dd4ee7cSKalpak Shah struct ext4_xattr_ibody_find *is = NULL; 13516dd4ee7cSKalpak Shah struct ext4_xattr_block_find *bs = NULL; 13526dd4ee7cSKalpak Shah char *buffer = NULL, *b_entry_name = NULL; 13536dd4ee7cSKalpak Shah size_t min_offs, free; 13547b1b2c1bSTheodore Ts'o int total_ino; 13556dd4ee7cSKalpak Shah void *base, *start, *end; 13566dd4ee7cSKalpak Shah int extra_isize = 0, error = 0, tried_min_extra_isize = 0; 1357ac39849dSAneesh Kumar K.V int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); 13586dd4ee7cSKalpak Shah 13596dd4ee7cSKalpak Shah down_write(&EXT4_I(inode)->xattr_sem); 13606dd4ee7cSKalpak Shah retry: 13616dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) { 13626dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 13636dd4ee7cSKalpak Shah return 0; 13646dd4ee7cSKalpak Shah } 13656dd4ee7cSKalpak Shah 13666dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 13676dd4ee7cSKalpak Shah entry = IFIRST(header); 13686dd4ee7cSKalpak Shah 13696dd4ee7cSKalpak Shah /* 13706dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 13716dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 13726dd4ee7cSKalpak Shah */ 13736dd4ee7cSKalpak Shah 13746dd4ee7cSKalpak Shah base = start = entry; 13756dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 13766dd4ee7cSKalpak Shah min_offs = end - base; 13776dd4ee7cSKalpak Shah last = entry; 13786dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 13796dd4ee7cSKalpak Shah 13809e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 13819e92f48cSTheodore Ts'o if (error) 13829e92f48cSTheodore Ts'o goto cleanup; 13839e92f48cSTheodore Ts'o 13846dd4ee7cSKalpak Shah free = ext4_xattr_free_space(last, &min_offs, base, &total_ino); 13856dd4ee7cSKalpak Shah if (free >= new_extra_isize) { 13866dd4ee7cSKalpak Shah entry = IFIRST(header); 13876dd4ee7cSKalpak Shah ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize 13886dd4ee7cSKalpak Shah - new_extra_isize, (void *)raw_inode + 13896dd4ee7cSKalpak Shah EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 13906dd4ee7cSKalpak Shah (void *)header, total_ino, 13916dd4ee7cSKalpak Shah inode->i_sb->s_blocksize); 13926dd4ee7cSKalpak Shah EXT4_I(inode)->i_extra_isize = new_extra_isize; 13936dd4ee7cSKalpak Shah error = 0; 13946dd4ee7cSKalpak Shah goto cleanup; 13956dd4ee7cSKalpak Shah } 13966dd4ee7cSKalpak Shah 13976dd4ee7cSKalpak Shah /* 13986dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 13996dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 14006dd4ee7cSKalpak Shah */ 14016dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 14026dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 14036dd4ee7cSKalpak Shah error = -EIO; 14046dd4ee7cSKalpak Shah if (!bh) 14056dd4ee7cSKalpak Shah goto cleanup; 1406cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 140724676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 140824676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 14096a797d27SDarrick J. Wong error = -EFSCORRUPTED; 14106dd4ee7cSKalpak Shah goto cleanup; 14116dd4ee7cSKalpak Shah } 14126dd4ee7cSKalpak Shah base = BHDR(bh); 14136dd4ee7cSKalpak Shah first = BFIRST(bh); 14146dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 14156dd4ee7cSKalpak Shah min_offs = end - base; 14167b1b2c1bSTheodore Ts'o free = ext4_xattr_free_space(first, &min_offs, base, NULL); 14176dd4ee7cSKalpak Shah if (free < new_extra_isize) { 14186dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 14196dd4ee7cSKalpak Shah tried_min_extra_isize++; 14206dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 14216dd4ee7cSKalpak Shah brelse(bh); 14226dd4ee7cSKalpak Shah goto retry; 14236dd4ee7cSKalpak Shah } 14246dd4ee7cSKalpak Shah error = -1; 14256dd4ee7cSKalpak Shah goto cleanup; 14266dd4ee7cSKalpak Shah } 14276dd4ee7cSKalpak Shah } else { 14286dd4ee7cSKalpak Shah free = inode->i_sb->s_blocksize; 14296dd4ee7cSKalpak Shah } 14306dd4ee7cSKalpak Shah 14316dd4ee7cSKalpak Shah while (new_extra_isize > 0) { 14326dd4ee7cSKalpak Shah size_t offs, size, entry_size; 14336dd4ee7cSKalpak Shah struct ext4_xattr_entry *small_entry = NULL; 14346dd4ee7cSKalpak Shah struct ext4_xattr_info i = { 14356dd4ee7cSKalpak Shah .value = NULL, 14366dd4ee7cSKalpak Shah .value_len = 0, 14376dd4ee7cSKalpak Shah }; 14386dd4ee7cSKalpak Shah unsigned int total_size; /* EA entry size + value size */ 14396dd4ee7cSKalpak Shah unsigned int shift_bytes; /* No. of bytes to shift EAs by? */ 14406dd4ee7cSKalpak Shah unsigned int min_total_size = ~0U; 14416dd4ee7cSKalpak Shah 14426dd4ee7cSKalpak Shah is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 14436dd4ee7cSKalpak Shah bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 14446dd4ee7cSKalpak Shah if (!is || !bs) { 14456dd4ee7cSKalpak Shah error = -ENOMEM; 14466dd4ee7cSKalpak Shah goto cleanup; 14476dd4ee7cSKalpak Shah } 14486dd4ee7cSKalpak Shah 14496dd4ee7cSKalpak Shah is->s.not_found = -ENODATA; 14506dd4ee7cSKalpak Shah bs->s.not_found = -ENODATA; 14516dd4ee7cSKalpak Shah is->iloc.bh = NULL; 14526dd4ee7cSKalpak Shah bs->bh = NULL; 14536dd4ee7cSKalpak Shah 14546dd4ee7cSKalpak Shah last = IFIRST(header); 14556dd4ee7cSKalpak Shah /* Find the entry best suited to be pushed into EA block */ 14566dd4ee7cSKalpak Shah entry = NULL; 14576dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 14586dd4ee7cSKalpak Shah total_size = 14596dd4ee7cSKalpak Shah EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + 14606dd4ee7cSKalpak Shah EXT4_XATTR_LEN(last->e_name_len); 14616dd4ee7cSKalpak Shah if (total_size <= free && total_size < min_total_size) { 14626dd4ee7cSKalpak Shah if (total_size < new_extra_isize) { 14636dd4ee7cSKalpak Shah small_entry = last; 14646dd4ee7cSKalpak Shah } else { 14656dd4ee7cSKalpak Shah entry = last; 14666dd4ee7cSKalpak Shah min_total_size = total_size; 14676dd4ee7cSKalpak Shah } 14686dd4ee7cSKalpak Shah } 14696dd4ee7cSKalpak Shah } 14706dd4ee7cSKalpak Shah 14716dd4ee7cSKalpak Shah if (entry == NULL) { 14726dd4ee7cSKalpak Shah if (small_entry) { 14736dd4ee7cSKalpak Shah entry = small_entry; 14746dd4ee7cSKalpak Shah } else { 14756dd4ee7cSKalpak Shah if (!tried_min_extra_isize && 14766dd4ee7cSKalpak Shah s_min_extra_isize) { 14776dd4ee7cSKalpak Shah tried_min_extra_isize++; 14786dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 14796e4ea8e3SDave Jones kfree(is); is = NULL; 14806e4ea8e3SDave Jones kfree(bs); bs = NULL; 1481dcb9917bSTheodore Ts'o brelse(bh); 14826dd4ee7cSKalpak Shah goto retry; 14836dd4ee7cSKalpak Shah } 14846dd4ee7cSKalpak Shah error = -1; 14856dd4ee7cSKalpak Shah goto cleanup; 14866dd4ee7cSKalpak Shah } 14876dd4ee7cSKalpak Shah } 14886dd4ee7cSKalpak Shah offs = le16_to_cpu(entry->e_value_offs); 14896dd4ee7cSKalpak Shah size = le32_to_cpu(entry->e_value_size); 14906dd4ee7cSKalpak Shah entry_size = EXT4_XATTR_LEN(entry->e_name_len); 14916dd4ee7cSKalpak Shah i.name_index = entry->e_name_index, 14926dd4ee7cSKalpak Shah buffer = kmalloc(EXT4_XATTR_SIZE(size), GFP_NOFS); 14936dd4ee7cSKalpak Shah b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 14946dd4ee7cSKalpak Shah if (!buffer || !b_entry_name) { 14956dd4ee7cSKalpak Shah error = -ENOMEM; 14966dd4ee7cSKalpak Shah goto cleanup; 14976dd4ee7cSKalpak Shah } 14986dd4ee7cSKalpak Shah /* Save the entry name and the entry value */ 14996dd4ee7cSKalpak Shah memcpy(buffer, (void *)IFIRST(header) + offs, 15006dd4ee7cSKalpak Shah EXT4_XATTR_SIZE(size)); 15016dd4ee7cSKalpak Shah memcpy(b_entry_name, entry->e_name, entry->e_name_len); 15026dd4ee7cSKalpak Shah b_entry_name[entry->e_name_len] = '\0'; 15036dd4ee7cSKalpak Shah i.name = b_entry_name; 15046dd4ee7cSKalpak Shah 15056dd4ee7cSKalpak Shah error = ext4_get_inode_loc(inode, &is->iloc); 15066dd4ee7cSKalpak Shah if (error) 15076dd4ee7cSKalpak Shah goto cleanup; 15086dd4ee7cSKalpak Shah 15096dd4ee7cSKalpak Shah error = ext4_xattr_ibody_find(inode, &i, is); 15106dd4ee7cSKalpak Shah if (error) 15116dd4ee7cSKalpak Shah goto cleanup; 15126dd4ee7cSKalpak Shah 15136dd4ee7cSKalpak Shah /* Remove the chosen entry from the inode */ 15146dd4ee7cSKalpak Shah error = ext4_xattr_ibody_set(handle, inode, &i, is); 15159aaab058SRoel Kluin if (error) 15169aaab058SRoel Kluin goto cleanup; 15176dd4ee7cSKalpak Shah 15186dd4ee7cSKalpak Shah entry = IFIRST(header); 15196dd4ee7cSKalpak Shah if (entry_size + EXT4_XATTR_SIZE(size) >= new_extra_isize) 15206dd4ee7cSKalpak Shah shift_bytes = new_extra_isize; 15216dd4ee7cSKalpak Shah else 15226dd4ee7cSKalpak Shah shift_bytes = entry_size + size; 15236dd4ee7cSKalpak Shah /* Adjust the offsets and shift the remaining entries ahead */ 15246dd4ee7cSKalpak Shah ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize - 15256dd4ee7cSKalpak Shah shift_bytes, (void *)raw_inode + 15266dd4ee7cSKalpak Shah EXT4_GOOD_OLD_INODE_SIZE + extra_isize + shift_bytes, 15276dd4ee7cSKalpak Shah (void *)header, total_ino - entry_size, 15286dd4ee7cSKalpak Shah inode->i_sb->s_blocksize); 15296dd4ee7cSKalpak Shah 15306dd4ee7cSKalpak Shah extra_isize += shift_bytes; 15316dd4ee7cSKalpak Shah new_extra_isize -= shift_bytes; 15326dd4ee7cSKalpak Shah EXT4_I(inode)->i_extra_isize = extra_isize; 15336dd4ee7cSKalpak Shah 15346dd4ee7cSKalpak Shah i.name = b_entry_name; 15356dd4ee7cSKalpak Shah i.value = buffer; 1536ac39849dSAneesh Kumar K.V i.value_len = size; 15376dd4ee7cSKalpak Shah error = ext4_xattr_block_find(inode, &i, bs); 15386dd4ee7cSKalpak Shah if (error) 15396dd4ee7cSKalpak Shah goto cleanup; 15406dd4ee7cSKalpak Shah 15416dd4ee7cSKalpak Shah /* Add entry which was removed from the inode into the block */ 15426dd4ee7cSKalpak Shah error = ext4_xattr_block_set(handle, inode, &i, bs); 15436dd4ee7cSKalpak Shah if (error) 15446dd4ee7cSKalpak Shah goto cleanup; 15456dd4ee7cSKalpak Shah kfree(b_entry_name); 15466dd4ee7cSKalpak Shah kfree(buffer); 1547d3533d72SJulia Lawall b_entry_name = NULL; 1548d3533d72SJulia Lawall buffer = NULL; 15496dd4ee7cSKalpak Shah brelse(is->iloc.bh); 15506dd4ee7cSKalpak Shah kfree(is); 15516dd4ee7cSKalpak Shah kfree(bs); 15526dd4ee7cSKalpak Shah } 15536dd4ee7cSKalpak Shah brelse(bh); 15546dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 15556dd4ee7cSKalpak Shah return 0; 15566dd4ee7cSKalpak Shah 15576dd4ee7cSKalpak Shah cleanup: 15586dd4ee7cSKalpak Shah kfree(b_entry_name); 15596dd4ee7cSKalpak Shah kfree(buffer); 15606dd4ee7cSKalpak Shah if (is) 15616dd4ee7cSKalpak Shah brelse(is->iloc.bh); 15626dd4ee7cSKalpak Shah kfree(is); 15636dd4ee7cSKalpak Shah kfree(bs); 15646dd4ee7cSKalpak Shah brelse(bh); 15656dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 15666dd4ee7cSKalpak Shah return error; 15676dd4ee7cSKalpak Shah } 15686dd4ee7cSKalpak Shah 15696dd4ee7cSKalpak Shah 15706dd4ee7cSKalpak Shah 15716dd4ee7cSKalpak Shah /* 1572617ba13bSMingming Cao * ext4_xattr_delete_inode() 1573ac27a0ecSDave Kleikamp * 1574ac27a0ecSDave Kleikamp * Free extended attribute resources associated with this inode. This 1575ac27a0ecSDave Kleikamp * is called immediately before an inode is freed. We have exclusive 1576ac27a0ecSDave Kleikamp * access to the inode. 1577ac27a0ecSDave Kleikamp */ 1578ac27a0ecSDave Kleikamp void 1579617ba13bSMingming Cao ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) 1580ac27a0ecSDave Kleikamp { 1581ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 1582ac27a0ecSDave Kleikamp 1583617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 1584ac27a0ecSDave Kleikamp goto cleanup; 1585617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 1586ac27a0ecSDave Kleikamp if (!bh) { 158724676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 158824676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1589ac27a0ecSDave Kleikamp goto cleanup; 1590ac27a0ecSDave Kleikamp } 1591617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 1592ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) { 159324676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 159424676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1595ac27a0ecSDave Kleikamp goto cleanup; 1596ac27a0ecSDave Kleikamp } 1597617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bh); 1598617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 1599ac27a0ecSDave Kleikamp 1600ac27a0ecSDave Kleikamp cleanup: 1601ac27a0ecSDave Kleikamp brelse(bh); 1602ac27a0ecSDave Kleikamp } 1603ac27a0ecSDave Kleikamp 1604ac27a0ecSDave Kleikamp /* 1605617ba13bSMingming Cao * ext4_xattr_cache_insert() 1606ac27a0ecSDave Kleikamp * 1607ac27a0ecSDave Kleikamp * Create a new entry in the extended attribute cache, and insert 1608ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 1609ac27a0ecSDave Kleikamp * 1610ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1611ac27a0ecSDave Kleikamp */ 1612ac27a0ecSDave Kleikamp static void 16137a2508e1SJan Kara ext4_xattr_cache_insert(struct mb_cache *ext4_mb_cache, struct buffer_head *bh) 1614ac27a0ecSDave Kleikamp { 16156048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 16166048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 16176048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 16186048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 1619ac27a0ecSDave Kleikamp int error; 1620ac27a0ecSDave Kleikamp 16217a2508e1SJan Kara error = mb_cache_entry_create(ext4_mb_cache, GFP_NOFS, hash, 16226048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 1623ac27a0ecSDave Kleikamp if (error) { 162482939d79SJan Kara if (error == -EBUSY) 1625ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 162682939d79SJan Kara } else 1627ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 1628ac27a0ecSDave Kleikamp } 1629ac27a0ecSDave Kleikamp 1630ac27a0ecSDave Kleikamp /* 1631617ba13bSMingming Cao * ext4_xattr_cmp() 1632ac27a0ecSDave Kleikamp * 1633ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 1634ac27a0ecSDave Kleikamp * 1635ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 1636ac27a0ecSDave Kleikamp * a negative error number on errors. 1637ac27a0ecSDave Kleikamp */ 1638ac27a0ecSDave Kleikamp static int 1639617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 1640617ba13bSMingming Cao struct ext4_xattr_header *header2) 1641ac27a0ecSDave Kleikamp { 1642617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 1643ac27a0ecSDave Kleikamp 1644ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 1645ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 1646ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 1647ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 1648ac27a0ecSDave Kleikamp return 1; 1649ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 1650ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 1651ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 1652ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 1653ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 1654ac27a0ecSDave Kleikamp return 1; 1655ac27a0ecSDave Kleikamp if (entry1->e_value_block != 0 || entry2->e_value_block != 0) 16566a797d27SDarrick J. Wong return -EFSCORRUPTED; 1657ac27a0ecSDave Kleikamp if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 1658ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 1659ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 1660ac27a0ecSDave Kleikamp return 1; 1661ac27a0ecSDave Kleikamp 1662617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 1663617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 1664ac27a0ecSDave Kleikamp } 1665ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 1666ac27a0ecSDave Kleikamp return 1; 1667ac27a0ecSDave Kleikamp return 0; 1668ac27a0ecSDave Kleikamp } 1669ac27a0ecSDave Kleikamp 1670ac27a0ecSDave Kleikamp /* 1671617ba13bSMingming Cao * ext4_xattr_cache_find() 1672ac27a0ecSDave Kleikamp * 1673ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 1674ac27a0ecSDave Kleikamp * 1675ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 1676ac27a0ecSDave Kleikamp * not found or an error occurred. 1677ac27a0ecSDave Kleikamp */ 1678ac27a0ecSDave Kleikamp static struct buffer_head * 1679617ba13bSMingming Cao ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, 16807a2508e1SJan Kara struct mb_cache_entry **pce) 1681ac27a0ecSDave Kleikamp { 1682ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 16837a2508e1SJan Kara struct mb_cache_entry *ce; 16847a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 1685ac27a0ecSDave Kleikamp 1686ac27a0ecSDave Kleikamp if (!header->h_hash) 1687ac27a0ecSDave Kleikamp return NULL; /* never share */ 1688ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 16897a2508e1SJan Kara ce = mb_cache_entry_find_first(ext4_mb_cache, hash); 1690ac27a0ecSDave Kleikamp while (ce) { 1691ac27a0ecSDave Kleikamp struct buffer_head *bh; 1692ac27a0ecSDave Kleikamp 1693ac27a0ecSDave Kleikamp bh = sb_bread(inode->i_sb, ce->e_block); 1694ac27a0ecSDave Kleikamp if (!bh) { 169524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 169624676da4STheodore Ts'o (unsigned long) ce->e_block); 1697617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 1698ac27a0ecSDave Kleikamp *pce = ce; 1699ac27a0ecSDave Kleikamp return bh; 1700ac27a0ecSDave Kleikamp } 1701ac27a0ecSDave Kleikamp brelse(bh); 17027a2508e1SJan Kara ce = mb_cache_entry_find_next(ext4_mb_cache, ce); 1703ac27a0ecSDave Kleikamp } 1704ac27a0ecSDave Kleikamp return NULL; 1705ac27a0ecSDave Kleikamp } 1706ac27a0ecSDave Kleikamp 1707ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 1708ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 1709ac27a0ecSDave Kleikamp 1710ac27a0ecSDave Kleikamp /* 1711617ba13bSMingming Cao * ext4_xattr_hash_entry() 1712ac27a0ecSDave Kleikamp * 1713ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 1714ac27a0ecSDave Kleikamp */ 1715617ba13bSMingming Cao static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, 1716617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1717ac27a0ecSDave Kleikamp { 1718ac27a0ecSDave Kleikamp __u32 hash = 0; 1719ac27a0ecSDave Kleikamp char *name = entry->e_name; 1720ac27a0ecSDave Kleikamp int n; 1721ac27a0ecSDave Kleikamp 1722ac27a0ecSDave Kleikamp for (n = 0; n < entry->e_name_len; n++) { 1723ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 1724ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 1725ac27a0ecSDave Kleikamp *name++; 1726ac27a0ecSDave Kleikamp } 1727ac27a0ecSDave Kleikamp 1728ac27a0ecSDave Kleikamp if (entry->e_value_block == 0 && entry->e_value_size != 0) { 1729ac27a0ecSDave Kleikamp __le32 *value = (__le32 *)((char *)header + 1730ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs)); 1731ac27a0ecSDave Kleikamp for (n = (le32_to_cpu(entry->e_value_size) + 1732617ba13bSMingming Cao EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { 1733ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 1734ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 1735ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 1736ac27a0ecSDave Kleikamp } 1737ac27a0ecSDave Kleikamp } 1738ac27a0ecSDave Kleikamp entry->e_hash = cpu_to_le32(hash); 1739ac27a0ecSDave Kleikamp } 1740ac27a0ecSDave Kleikamp 1741ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 1742ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 1743ac27a0ecSDave Kleikamp 1744ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 1745ac27a0ecSDave Kleikamp 1746ac27a0ecSDave Kleikamp /* 1747617ba13bSMingming Cao * ext4_xattr_rehash() 1748ac27a0ecSDave Kleikamp * 1749ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 1750ac27a0ecSDave Kleikamp */ 1751617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *header, 1752617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1753ac27a0ecSDave Kleikamp { 1754617ba13bSMingming Cao struct ext4_xattr_entry *here; 1755ac27a0ecSDave Kleikamp __u32 hash = 0; 1756ac27a0ecSDave Kleikamp 1757617ba13bSMingming Cao ext4_xattr_hash_entry(header, entry); 1758ac27a0ecSDave Kleikamp here = ENTRY(header+1); 1759ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 1760ac27a0ecSDave Kleikamp if (!here->e_hash) { 1761ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 1762ac27a0ecSDave Kleikamp hash = 0; 1763ac27a0ecSDave Kleikamp break; 1764ac27a0ecSDave Kleikamp } 1765ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 1766ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 1767ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 1768617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 1769ac27a0ecSDave Kleikamp } 1770ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 1771ac27a0ecSDave Kleikamp } 1772ac27a0ecSDave Kleikamp 1773ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 1774ac27a0ecSDave Kleikamp 17759c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 17769c191f70ST Makphaibulchoke 17777a2508e1SJan Kara struct mb_cache * 177882939d79SJan Kara ext4_xattr_create_cache(void) 1779ac27a0ecSDave Kleikamp { 17807a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 1781ac27a0ecSDave Kleikamp } 1782ac27a0ecSDave Kleikamp 17837a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 1784ac27a0ecSDave Kleikamp { 17859c191f70ST Makphaibulchoke if (cache) 17867a2508e1SJan Kara mb_cache_destroy(cache); 1787ac27a0ecSDave Kleikamp } 17889c191f70ST Makphaibulchoke 1789