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> 56*82939d79SJan Kara #include <linux/mbcache2.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 81*82939d79SJan Kara static void ext4_xattr_cache_insert(struct mb2_cache *, struct buffer_head *); 82617ba13bSMingming Cao static struct buffer_head *ext4_xattr_cache_find(struct inode *, 83617ba13bSMingming Cao struct ext4_xattr_header *, 84*82939d79SJan Kara struct mb2_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 __le32 save_csum; 125d6a77105STheodore Ts'o __le64 dsk_block_nr = cpu_to_le64(block_nr); 126cc8e94fdSDarrick J. Wong 127d6a77105STheodore Ts'o save_csum = hdr->h_checksum; 128cc8e94fdSDarrick J. Wong hdr->h_checksum = 0; 129d6a77105STheodore Ts'o csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, 130d6a77105STheodore Ts'o sizeof(dsk_block_nr)); 131cc8e94fdSDarrick J. Wong csum = ext4_chksum(sbi, csum, (__u8 *)hdr, 132cc8e94fdSDarrick J. Wong EXT4_BLOCK_SIZE(inode->i_sb)); 13341eb70ddSTao Ma 134d6a77105STheodore Ts'o hdr->h_checksum = save_csum; 135cc8e94fdSDarrick J. Wong return cpu_to_le32(csum); 136cc8e94fdSDarrick J. Wong } 137cc8e94fdSDarrick J. Wong 138cc8e94fdSDarrick J. Wong static int ext4_xattr_block_csum_verify(struct inode *inode, 139cc8e94fdSDarrick J. Wong sector_t block_nr, 140cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 141cc8e94fdSDarrick J. Wong { 1429aa5d32bSDmitry Monakhov if (ext4_has_metadata_csum(inode->i_sb) && 143cc8e94fdSDarrick J. Wong (hdr->h_checksum != ext4_xattr_block_csum(inode, block_nr, hdr))) 144cc8e94fdSDarrick J. Wong return 0; 145cc8e94fdSDarrick J. Wong return 1; 146cc8e94fdSDarrick J. Wong } 147cc8e94fdSDarrick J. Wong 148cc8e94fdSDarrick J. Wong static void ext4_xattr_block_csum_set(struct inode *inode, 149cc8e94fdSDarrick J. Wong sector_t block_nr, 150cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 151cc8e94fdSDarrick J. Wong { 1529aa5d32bSDmitry Monakhov if (!ext4_has_metadata_csum(inode->i_sb)) 153cc8e94fdSDarrick J. Wong return; 154cc8e94fdSDarrick J. Wong 155cc8e94fdSDarrick J. Wong hdr->h_checksum = ext4_xattr_block_csum(inode, block_nr, hdr); 156cc8e94fdSDarrick J. Wong } 157cc8e94fdSDarrick J. Wong 158cc8e94fdSDarrick J. Wong static inline int ext4_handle_dirty_xattr_block(handle_t *handle, 159cc8e94fdSDarrick J. Wong struct inode *inode, 160cc8e94fdSDarrick J. Wong struct buffer_head *bh) 161cc8e94fdSDarrick J. Wong { 162cc8e94fdSDarrick J. Wong ext4_xattr_block_csum_set(inode, bh->b_blocknr, BHDR(bh)); 163cc8e94fdSDarrick J. Wong return ext4_handle_dirty_metadata(handle, inode, bh); 164cc8e94fdSDarrick J. Wong } 165cc8e94fdSDarrick J. Wong 16611e27528SStephen Hemminger static inline const struct xattr_handler * 167617ba13bSMingming Cao ext4_xattr_handler(int name_index) 168ac27a0ecSDave Kleikamp { 16911e27528SStephen Hemminger const struct xattr_handler *handler = NULL; 170ac27a0ecSDave Kleikamp 171617ba13bSMingming Cao if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) 172617ba13bSMingming Cao handler = ext4_xattr_handler_map[name_index]; 173ac27a0ecSDave Kleikamp return handler; 174ac27a0ecSDave Kleikamp } 175ac27a0ecSDave Kleikamp 176ac27a0ecSDave Kleikamp /* 177ac27a0ecSDave Kleikamp * Inode operation listxattr() 178ac27a0ecSDave Kleikamp * 1792b0143b5SDavid Howells * d_inode(dentry)->i_mutex: don't care 180ac27a0ecSDave Kleikamp */ 181ac27a0ecSDave Kleikamp ssize_t 182617ba13bSMingming Cao ext4_listxattr(struct dentry *dentry, char *buffer, size_t size) 183ac27a0ecSDave Kleikamp { 184431547b3SChristoph Hellwig return ext4_xattr_list(dentry, buffer, size); 185ac27a0ecSDave Kleikamp } 186ac27a0ecSDave Kleikamp 187ac27a0ecSDave Kleikamp static int 188a0626e75SDarrick J. Wong ext4_xattr_check_names(struct ext4_xattr_entry *entry, void *end, 189a0626e75SDarrick J. Wong void *value_start) 190ac27a0ecSDave Kleikamp { 191a0626e75SDarrick J. Wong struct ext4_xattr_entry *e = entry; 192a0626e75SDarrick J. Wong 193a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(e)) { 194a0626e75SDarrick J. Wong struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); 195ac27a0ecSDave Kleikamp if ((void *)next >= end) 1966a797d27SDarrick J. Wong return -EFSCORRUPTED; 197a0626e75SDarrick J. Wong e = next; 198ac27a0ecSDave Kleikamp } 199a0626e75SDarrick J. Wong 200a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(entry)) { 201a0626e75SDarrick J. Wong if (entry->e_value_size != 0 && 202a0626e75SDarrick J. Wong (value_start + le16_to_cpu(entry->e_value_offs) < 203a0626e75SDarrick J. Wong (void *)e + sizeof(__u32) || 204a0626e75SDarrick J. Wong value_start + le16_to_cpu(entry->e_value_offs) + 205a0626e75SDarrick J. Wong le32_to_cpu(entry->e_value_size) > end)) 2066a797d27SDarrick J. Wong return -EFSCORRUPTED; 207a0626e75SDarrick J. Wong entry = EXT4_XATTR_NEXT(entry); 208a0626e75SDarrick J. Wong } 209a0626e75SDarrick J. Wong 210ac27a0ecSDave Kleikamp return 0; 211ac27a0ecSDave Kleikamp } 212ac27a0ecSDave Kleikamp 213ac27a0ecSDave Kleikamp static inline int 214cc8e94fdSDarrick J. Wong ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) 215ac27a0ecSDave Kleikamp { 216cc8e94fdSDarrick J. Wong int error; 217cc8e94fdSDarrick J. Wong 218cc8e94fdSDarrick J. Wong if (buffer_verified(bh)) 219cc8e94fdSDarrick J. Wong return 0; 220cc8e94fdSDarrick J. Wong 221617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 222ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) 2236a797d27SDarrick J. Wong return -EFSCORRUPTED; 224cc8e94fdSDarrick J. Wong if (!ext4_xattr_block_csum_verify(inode, bh->b_blocknr, BHDR(bh))) 2256a797d27SDarrick J. Wong return -EFSBADCRC; 226a0626e75SDarrick J. Wong error = ext4_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size, 227a0626e75SDarrick J. Wong bh->b_data); 228cc8e94fdSDarrick J. Wong if (!error) 229cc8e94fdSDarrick J. Wong set_buffer_verified(bh); 230cc8e94fdSDarrick J. Wong return error; 231ac27a0ecSDave Kleikamp } 232ac27a0ecSDave Kleikamp 233ac27a0ecSDave Kleikamp static inline int 234617ba13bSMingming Cao ext4_xattr_check_entry(struct ext4_xattr_entry *entry, size_t size) 235ac27a0ecSDave Kleikamp { 236ac27a0ecSDave Kleikamp size_t value_size = le32_to_cpu(entry->e_value_size); 237ac27a0ecSDave Kleikamp 238ac27a0ecSDave Kleikamp if (entry->e_value_block != 0 || value_size > size || 239ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs) + value_size > size) 2406a797d27SDarrick J. Wong return -EFSCORRUPTED; 241ac27a0ecSDave Kleikamp return 0; 242ac27a0ecSDave Kleikamp } 243ac27a0ecSDave Kleikamp 244ac27a0ecSDave Kleikamp static int 245617ba13bSMingming Cao ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, 246ac27a0ecSDave Kleikamp const char *name, size_t size, int sorted) 247ac27a0ecSDave Kleikamp { 248617ba13bSMingming Cao struct ext4_xattr_entry *entry; 249ac27a0ecSDave Kleikamp size_t name_len; 250ac27a0ecSDave Kleikamp int cmp = 1; 251ac27a0ecSDave Kleikamp 252ac27a0ecSDave Kleikamp if (name == NULL) 253ac27a0ecSDave Kleikamp return -EINVAL; 254ac27a0ecSDave Kleikamp name_len = strlen(name); 255ac27a0ecSDave Kleikamp entry = *pentry; 256617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 257ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 258ac27a0ecSDave Kleikamp if (!cmp) 259ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 260ac27a0ecSDave Kleikamp if (!cmp) 261ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 262ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 263ac27a0ecSDave Kleikamp break; 264ac27a0ecSDave Kleikamp } 265ac27a0ecSDave Kleikamp *pentry = entry; 266617ba13bSMingming Cao if (!cmp && ext4_xattr_check_entry(entry, size)) 2676a797d27SDarrick J. Wong return -EFSCORRUPTED; 268ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 269ac27a0ecSDave Kleikamp } 270ac27a0ecSDave Kleikamp 271ac27a0ecSDave Kleikamp static int 272617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 273ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 274ac27a0ecSDave Kleikamp { 275ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 276617ba13bSMingming Cao struct ext4_xattr_entry *entry; 277ac27a0ecSDave Kleikamp size_t size; 278ac27a0ecSDave Kleikamp int error; 279*82939d79SJan Kara struct mb2_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 280ac27a0ecSDave Kleikamp 281ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 282ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 283ac27a0ecSDave Kleikamp 284ac27a0ecSDave Kleikamp error = -ENODATA; 285617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 286ac27a0ecSDave Kleikamp goto cleanup; 287ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 288ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 289617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 290ac27a0ecSDave Kleikamp if (!bh) 291ac27a0ecSDave Kleikamp goto cleanup; 292ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 293ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 294cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 29512062dddSEric Sandeen bad_block: 29624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 297617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 2986a797d27SDarrick J. Wong error = -EFSCORRUPTED; 299ac27a0ecSDave Kleikamp goto cleanup; 300ac27a0ecSDave Kleikamp } 3019c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, bh); 302ac27a0ecSDave Kleikamp entry = BFIRST(bh); 303617ba13bSMingming Cao error = ext4_xattr_find_entry(&entry, name_index, name, bh->b_size, 1); 3046a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 305ac27a0ecSDave Kleikamp goto bad_block; 306ac27a0ecSDave Kleikamp if (error) 307ac27a0ecSDave Kleikamp goto cleanup; 308ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 309ac27a0ecSDave Kleikamp if (buffer) { 310ac27a0ecSDave Kleikamp error = -ERANGE; 311ac27a0ecSDave Kleikamp if (size > buffer_size) 312ac27a0ecSDave Kleikamp goto cleanup; 313ac27a0ecSDave Kleikamp memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs), 314ac27a0ecSDave Kleikamp size); 315ac27a0ecSDave Kleikamp } 316ac27a0ecSDave Kleikamp error = size; 317ac27a0ecSDave Kleikamp 318ac27a0ecSDave Kleikamp cleanup: 319ac27a0ecSDave Kleikamp brelse(bh); 320ac27a0ecSDave Kleikamp return error; 321ac27a0ecSDave Kleikamp } 322ac27a0ecSDave Kleikamp 323879b3825STao Ma int 324617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 325ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 326ac27a0ecSDave Kleikamp { 327617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 328617ba13bSMingming Cao struct ext4_xattr_entry *entry; 329617ba13bSMingming Cao struct ext4_inode *raw_inode; 330617ba13bSMingming Cao struct ext4_iloc iloc; 331ac27a0ecSDave Kleikamp size_t size; 332ac27a0ecSDave Kleikamp void *end; 333ac27a0ecSDave Kleikamp int error; 334ac27a0ecSDave Kleikamp 33519f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 336ac27a0ecSDave Kleikamp return -ENODATA; 337617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 338ac27a0ecSDave Kleikamp if (error) 339ac27a0ecSDave Kleikamp return error; 340617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 341ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 342ac27a0ecSDave Kleikamp entry = IFIRST(header); 343617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 344a0626e75SDarrick J. Wong error = ext4_xattr_check_names(entry, end, entry); 345ac27a0ecSDave Kleikamp if (error) 346ac27a0ecSDave Kleikamp goto cleanup; 347617ba13bSMingming Cao error = ext4_xattr_find_entry(&entry, name_index, name, 348ac27a0ecSDave Kleikamp end - (void *)entry, 0); 349ac27a0ecSDave Kleikamp if (error) 350ac27a0ecSDave Kleikamp goto cleanup; 351ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 352ac27a0ecSDave Kleikamp if (buffer) { 353ac27a0ecSDave Kleikamp error = -ERANGE; 354ac27a0ecSDave Kleikamp if (size > buffer_size) 355ac27a0ecSDave Kleikamp goto cleanup; 356ac27a0ecSDave Kleikamp memcpy(buffer, (void *)IFIRST(header) + 357ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs), size); 358ac27a0ecSDave Kleikamp } 359ac27a0ecSDave Kleikamp error = size; 360ac27a0ecSDave Kleikamp 361ac27a0ecSDave Kleikamp cleanup: 362ac27a0ecSDave Kleikamp brelse(iloc.bh); 363ac27a0ecSDave Kleikamp return error; 364ac27a0ecSDave Kleikamp } 365ac27a0ecSDave Kleikamp 366ac27a0ecSDave Kleikamp /* 367617ba13bSMingming Cao * ext4_xattr_get() 368ac27a0ecSDave Kleikamp * 369ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 370ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 371ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 372ac27a0ecSDave Kleikamp * 373ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 374ac27a0ecSDave Kleikamp * used / required on success. 375ac27a0ecSDave Kleikamp */ 376ac27a0ecSDave Kleikamp int 377617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 378ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 379ac27a0ecSDave Kleikamp { 380ac27a0ecSDave Kleikamp int error; 381ac27a0ecSDave Kleikamp 382230b8c1aSZhang Zhen if (strlen(name) > 255) 383230b8c1aSZhang Zhen return -ERANGE; 384230b8c1aSZhang Zhen 385617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 386617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 387ac27a0ecSDave Kleikamp buffer_size); 388ac27a0ecSDave Kleikamp if (error == -ENODATA) 389617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 390ac27a0ecSDave Kleikamp buffer_size); 391617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 392ac27a0ecSDave Kleikamp return error; 393ac27a0ecSDave Kleikamp } 394ac27a0ecSDave Kleikamp 395ac27a0ecSDave Kleikamp static int 396431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 397ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 398ac27a0ecSDave Kleikamp { 399ac27a0ecSDave Kleikamp size_t rest = buffer_size; 400ac27a0ecSDave Kleikamp 401617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 40211e27528SStephen Hemminger const struct xattr_handler *handler = 403617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 404ac27a0ecSDave Kleikamp 405764a5c6bSAndreas Gruenbacher if (handler && (!handler->list || handler->list(dentry))) { 406764a5c6bSAndreas Gruenbacher const char *prefix = handler->prefix ?: handler->name; 407764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 408764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 409764a5c6bSAndreas Gruenbacher 410ac27a0ecSDave Kleikamp if (buffer) { 411ac27a0ecSDave Kleikamp if (size > rest) 412ac27a0ecSDave Kleikamp return -ERANGE; 413764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 414764a5c6bSAndreas Gruenbacher buffer += prefix_len; 415764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 416764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 417764a5c6bSAndreas Gruenbacher *buffer++ = 0; 418ac27a0ecSDave Kleikamp } 419ac27a0ecSDave Kleikamp rest -= size; 420ac27a0ecSDave Kleikamp } 421ac27a0ecSDave Kleikamp } 422764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 423ac27a0ecSDave Kleikamp } 424ac27a0ecSDave Kleikamp 425ac27a0ecSDave Kleikamp static int 426431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 427ac27a0ecSDave Kleikamp { 4282b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 429ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 430ac27a0ecSDave Kleikamp int error; 431*82939d79SJan Kara struct mb2_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 432ac27a0ecSDave Kleikamp 433ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 434ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 435ac27a0ecSDave Kleikamp 436ac27a0ecSDave Kleikamp error = 0; 437617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 438ac27a0ecSDave Kleikamp goto cleanup; 439ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 440ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 441617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 442ac27a0ecSDave Kleikamp error = -EIO; 443ac27a0ecSDave Kleikamp if (!bh) 444ac27a0ecSDave Kleikamp goto cleanup; 445ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 446ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 447cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 44824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 449617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 4506a797d27SDarrick J. Wong error = -EFSCORRUPTED; 451ac27a0ecSDave Kleikamp goto cleanup; 452ac27a0ecSDave Kleikamp } 4539c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, bh); 454431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); 455ac27a0ecSDave Kleikamp 456ac27a0ecSDave Kleikamp cleanup: 457ac27a0ecSDave Kleikamp brelse(bh); 458ac27a0ecSDave Kleikamp 459ac27a0ecSDave Kleikamp return error; 460ac27a0ecSDave Kleikamp } 461ac27a0ecSDave Kleikamp 462ac27a0ecSDave Kleikamp static int 463431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 464ac27a0ecSDave Kleikamp { 4652b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 466617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 467617ba13bSMingming Cao struct ext4_inode *raw_inode; 468617ba13bSMingming Cao struct ext4_iloc iloc; 469ac27a0ecSDave Kleikamp void *end; 470ac27a0ecSDave Kleikamp int error; 471ac27a0ecSDave Kleikamp 47219f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 473ac27a0ecSDave Kleikamp return 0; 474617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 475ac27a0ecSDave Kleikamp if (error) 476ac27a0ecSDave Kleikamp return error; 477617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 478ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 479617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 480a0626e75SDarrick J. Wong error = ext4_xattr_check_names(IFIRST(header), end, IFIRST(header)); 481ac27a0ecSDave Kleikamp if (error) 482ac27a0ecSDave Kleikamp goto cleanup; 483431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 484ac27a0ecSDave Kleikamp buffer, buffer_size); 485ac27a0ecSDave Kleikamp 486ac27a0ecSDave Kleikamp cleanup: 487ac27a0ecSDave Kleikamp brelse(iloc.bh); 488ac27a0ecSDave Kleikamp return error; 489ac27a0ecSDave Kleikamp } 490ac27a0ecSDave Kleikamp 491ac27a0ecSDave Kleikamp /* 492617ba13bSMingming Cao * ext4_xattr_list() 493ac27a0ecSDave Kleikamp * 494ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 495ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 496ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 497ac27a0ecSDave Kleikamp * 498ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 499ac27a0ecSDave Kleikamp * used / required on success. 500ac27a0ecSDave Kleikamp */ 501d3a95d47SMingming Cao static int 502431547b3SChristoph Hellwig ext4_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size) 503ac27a0ecSDave Kleikamp { 504eaeef867STheodore Ts'o int ret, ret2; 505ac27a0ecSDave Kleikamp 5062b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 507eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 508eaeef867STheodore Ts'o if (ret < 0) 509eaeef867STheodore Ts'o goto errout; 510ac27a0ecSDave Kleikamp if (buffer) { 511eaeef867STheodore Ts'o buffer += ret; 512eaeef867STheodore Ts'o buffer_size -= ret; 513ac27a0ecSDave Kleikamp } 514eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 515eaeef867STheodore Ts'o if (ret < 0) 516eaeef867STheodore Ts'o goto errout; 517eaeef867STheodore Ts'o ret += ret2; 518eaeef867STheodore Ts'o errout: 5192b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 520eaeef867STheodore Ts'o return ret; 521ac27a0ecSDave Kleikamp } 522ac27a0ecSDave Kleikamp 523ac27a0ecSDave Kleikamp /* 524617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 525ac27a0ecSDave Kleikamp * not set, set it. 526ac27a0ecSDave Kleikamp */ 527617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 528ac27a0ecSDave Kleikamp struct super_block *sb) 529ac27a0ecSDave Kleikamp { 530e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 531ac27a0ecSDave Kleikamp return; 532ac27a0ecSDave Kleikamp 5335d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 534617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 535e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 536a0375156STheodore Ts'o ext4_handle_dirty_super(handle, sb); 537ac27a0ecSDave Kleikamp } 538ac27a0ecSDave Kleikamp } 539ac27a0ecSDave Kleikamp 540ac27a0ecSDave Kleikamp /* 541ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 542ec4cb1aaSJan Kara * otherwise free the block. 543ac27a0ecSDave Kleikamp */ 544ac27a0ecSDave Kleikamp static void 545617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 546ac27a0ecSDave Kleikamp struct buffer_head *bh) 547ac27a0ecSDave Kleikamp { 5488a2bfdcbSMingming Cao int error = 0; 549ac27a0ecSDave Kleikamp 5505d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 5518a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 5528a2bfdcbSMingming Cao if (error) 5538a2bfdcbSMingming Cao goto out; 5548a2bfdcbSMingming Cao 5558a2bfdcbSMingming Cao lock_buffer(bh); 556ac27a0ecSDave Kleikamp if (BHDR(bh)->h_refcount == cpu_to_le32(1)) { 557*82939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bh)->h_hash); 558*82939d79SJan Kara 559ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 560*82939d79SJan Kara /* 561*82939d79SJan Kara * This must happen under buffer lock for 562*82939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 563*82939d79SJan Kara */ 564*82939d79SJan Kara mb2_cache_entry_delete_block(EXT4_GET_MB_CACHE(inode), hash, 565*82939d79SJan Kara bh->b_blocknr); 566ac27a0ecSDave Kleikamp get_bh(bh); 567ec4cb1aaSJan Kara unlock_buffer(bh); 568e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 569e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 570e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 571ac27a0ecSDave Kleikamp } else { 572e8546d06SMarcin Slusarz le32_add_cpu(&BHDR(bh)->h_refcount, -1); 573ec4cb1aaSJan Kara /* 574ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 575ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 576ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 577ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 578ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 579ec4cb1aaSJan Kara * call ext4_handle_dirty_xattr_block() with locked buffer as 580ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 581ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 582ec4cb1aaSJan Kara */ 583ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 584ec4cb1aaSJan Kara error = ext4_handle_dirty_xattr_block(handle, inode, 585ec4cb1aaSJan Kara bh); 586c1bb05a6SEric Sandeen unlock_buffer(bh); 587ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 588ec4cb1aaSJan Kara error = ext4_handle_dirty_xattr_block(handle, inode, 589ec4cb1aaSJan Kara bh); 590ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 5910390131bSFrank Mayhar ext4_handle_sync(handle); 5921231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 593ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 594ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 595ac27a0ecSDave Kleikamp } 5968a2bfdcbSMingming Cao out: 5978a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 5988a2bfdcbSMingming Cao return; 599ac27a0ecSDave Kleikamp } 600ac27a0ecSDave Kleikamp 6016dd4ee7cSKalpak Shah /* 6026dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 6036dd4ee7cSKalpak Shah * bytes used by EA entries. 6046dd4ee7cSKalpak Shah */ 6056dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 6066dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 6076dd4ee7cSKalpak Shah { 6086dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 6096dd4ee7cSKalpak Shah if (!last->e_value_block && last->e_value_size) { 6106dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 6116dd4ee7cSKalpak Shah if (offs < *min_offs) 6126dd4ee7cSKalpak Shah *min_offs = offs; 6136dd4ee7cSKalpak Shah } 6147b1b2c1bSTheodore Ts'o if (total) 6157b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 6166dd4ee7cSKalpak Shah } 6176dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 6186dd4ee7cSKalpak Shah } 6196dd4ee7cSKalpak Shah 620ac27a0ecSDave Kleikamp static int 621617ba13bSMingming Cao ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s) 622ac27a0ecSDave Kleikamp { 623617ba13bSMingming Cao struct ext4_xattr_entry *last; 624ac27a0ecSDave Kleikamp size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); 625ac27a0ecSDave Kleikamp 626ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 627ac27a0ecSDave Kleikamp last = s->first; 628617ba13bSMingming Cao for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 629ac27a0ecSDave Kleikamp if (!last->e_value_block && last->e_value_size) { 630ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 631ac27a0ecSDave Kleikamp if (offs < min_offs) 632ac27a0ecSDave Kleikamp min_offs = offs; 633ac27a0ecSDave Kleikamp } 634ac27a0ecSDave Kleikamp } 635ac27a0ecSDave Kleikamp free = min_offs - ((void *)last - s->base) - sizeof(__u32); 636ac27a0ecSDave Kleikamp if (!s->not_found) { 637ac27a0ecSDave Kleikamp if (!s->here->e_value_block && s->here->e_value_size) { 638ac27a0ecSDave Kleikamp size_t size = le32_to_cpu(s->here->e_value_size); 639617ba13bSMingming Cao free += EXT4_XATTR_SIZE(size); 640ac27a0ecSDave Kleikamp } 641617ba13bSMingming Cao free += EXT4_XATTR_LEN(name_len); 642ac27a0ecSDave Kleikamp } 643ac27a0ecSDave Kleikamp if (i->value) { 6445f80f62aSWei Yuan if (free < EXT4_XATTR_LEN(name_len) + 645617ba13bSMingming Cao EXT4_XATTR_SIZE(i->value_len)) 646ac27a0ecSDave Kleikamp return -ENOSPC; 647ac27a0ecSDave Kleikamp } 648ac27a0ecSDave Kleikamp 649ac27a0ecSDave Kleikamp if (i->value && s->not_found) { 650ac27a0ecSDave Kleikamp /* Insert the new name. */ 651617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 652ac27a0ecSDave Kleikamp size_t rest = (void *)last - (void *)s->here + sizeof(__u32); 653ac27a0ecSDave Kleikamp memmove((void *)s->here + size, s->here, rest); 654ac27a0ecSDave Kleikamp memset(s->here, 0, size); 655ac27a0ecSDave Kleikamp s->here->e_name_index = i->name_index; 656ac27a0ecSDave Kleikamp s->here->e_name_len = name_len; 657ac27a0ecSDave Kleikamp memcpy(s->here->e_name, i->name, name_len); 658ac27a0ecSDave Kleikamp } else { 659ac27a0ecSDave Kleikamp if (!s->here->e_value_block && s->here->e_value_size) { 660ac27a0ecSDave Kleikamp void *first_val = s->base + min_offs; 661ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(s->here->e_value_offs); 662ac27a0ecSDave Kleikamp void *val = s->base + offs; 663617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE( 664ac27a0ecSDave Kleikamp le32_to_cpu(s->here->e_value_size)); 665ac27a0ecSDave Kleikamp 666617ba13bSMingming Cao if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { 667ac27a0ecSDave Kleikamp /* The old and the new value have the same 668ac27a0ecSDave Kleikamp size. Just replace. */ 669ac27a0ecSDave Kleikamp s->here->e_value_size = 670ac27a0ecSDave Kleikamp cpu_to_le32(i->value_len); 671bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 672bd9926e8STheodore Ts'o memset(val, 0, size); 673bd9926e8STheodore Ts'o } else { 674bd9926e8STheodore Ts'o /* Clear pad bytes first. */ 675617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 676bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 677ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 678bd9926e8STheodore Ts'o } 679ac27a0ecSDave Kleikamp return 0; 680ac27a0ecSDave Kleikamp } 681ac27a0ecSDave Kleikamp 682ac27a0ecSDave Kleikamp /* Remove the old value. */ 683ac27a0ecSDave Kleikamp memmove(first_val + size, first_val, val - first_val); 684ac27a0ecSDave Kleikamp memset(first_val, 0, size); 685ac27a0ecSDave Kleikamp s->here->e_value_size = 0; 686ac27a0ecSDave Kleikamp s->here->e_value_offs = 0; 687ac27a0ecSDave Kleikamp min_offs += size; 688ac27a0ecSDave Kleikamp 689ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 690ac27a0ecSDave Kleikamp last = s->first; 691ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 692ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 693ac27a0ecSDave Kleikamp if (!last->e_value_block && 694ac27a0ecSDave Kleikamp last->e_value_size && o < offs) 695ac27a0ecSDave Kleikamp last->e_value_offs = 696ac27a0ecSDave Kleikamp cpu_to_le16(o + size); 697617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 698ac27a0ecSDave Kleikamp } 699ac27a0ecSDave Kleikamp } 700ac27a0ecSDave Kleikamp if (!i->value) { 701ac27a0ecSDave Kleikamp /* Remove the old name. */ 702617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 703ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 704ac27a0ecSDave Kleikamp memmove(s->here, (void *)s->here + size, 705ac27a0ecSDave Kleikamp (void *)last - (void *)s->here + sizeof(__u32)); 706ac27a0ecSDave Kleikamp memset(last, 0, size); 707ac27a0ecSDave Kleikamp } 708ac27a0ecSDave Kleikamp } 709ac27a0ecSDave Kleikamp 710ac27a0ecSDave Kleikamp if (i->value) { 711ac27a0ecSDave Kleikamp /* Insert the new value. */ 712ac27a0ecSDave Kleikamp s->here->e_value_size = cpu_to_le32(i->value_len); 713ac27a0ecSDave Kleikamp if (i->value_len) { 714617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE(i->value_len); 715ac27a0ecSDave Kleikamp void *val = s->base + min_offs - size; 716ac27a0ecSDave Kleikamp s->here->e_value_offs = cpu_to_le16(min_offs - size); 717bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 718bd9926e8STheodore Ts'o memset(val, 0, size); 719bd9926e8STheodore Ts'o } else { 720bd9926e8STheodore Ts'o /* Clear the pad bytes first. */ 721617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 722bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 723ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 724ac27a0ecSDave Kleikamp } 725ac27a0ecSDave Kleikamp } 726bd9926e8STheodore Ts'o } 727ac27a0ecSDave Kleikamp return 0; 728ac27a0ecSDave Kleikamp } 729ac27a0ecSDave Kleikamp 730617ba13bSMingming Cao struct ext4_xattr_block_find { 731617ba13bSMingming Cao struct ext4_xattr_search s; 732ac27a0ecSDave Kleikamp struct buffer_head *bh; 733ac27a0ecSDave Kleikamp }; 734ac27a0ecSDave Kleikamp 735ac27a0ecSDave Kleikamp static int 736617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 737617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 738ac27a0ecSDave Kleikamp { 739ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 740ac27a0ecSDave Kleikamp int error; 741ac27a0ecSDave Kleikamp 742ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 743ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 744ac27a0ecSDave Kleikamp 745617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 746ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 747617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 748ac27a0ecSDave Kleikamp error = -EIO; 749ac27a0ecSDave Kleikamp if (!bs->bh) 750ac27a0ecSDave Kleikamp goto cleanup; 751ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 752ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 753ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 754cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bs->bh)) { 75524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 75624676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 7576a797d27SDarrick J. Wong error = -EFSCORRUPTED; 758ac27a0ecSDave Kleikamp goto cleanup; 759ac27a0ecSDave Kleikamp } 760ac27a0ecSDave Kleikamp /* Find the named attribute. */ 761ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 762ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 763ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 764ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 765617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 766ac27a0ecSDave Kleikamp i->name, bs->bh->b_size, 1); 767ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 768ac27a0ecSDave Kleikamp goto cleanup; 769ac27a0ecSDave Kleikamp bs->s.not_found = error; 770ac27a0ecSDave Kleikamp } 771ac27a0ecSDave Kleikamp error = 0; 772ac27a0ecSDave Kleikamp 773ac27a0ecSDave Kleikamp cleanup: 774ac27a0ecSDave Kleikamp return error; 775ac27a0ecSDave Kleikamp } 776ac27a0ecSDave Kleikamp 777ac27a0ecSDave Kleikamp static int 778617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 779617ba13bSMingming Cao struct ext4_xattr_info *i, 780617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 781ac27a0ecSDave Kleikamp { 782ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 783ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 784617ba13bSMingming Cao struct ext4_xattr_search *s = &bs->s; 785*82939d79SJan Kara struct mb2_cache_entry *ce = NULL; 7868a2bfdcbSMingming Cao int error = 0; 787*82939d79SJan Kara struct mb2_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 788ac27a0ecSDave Kleikamp 789617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 790ac27a0ecSDave Kleikamp 791ac27a0ecSDave Kleikamp if (i->value && i->value_len > sb->s_blocksize) 792ac27a0ecSDave Kleikamp return -ENOSPC; 793ac27a0ecSDave Kleikamp if (s->base) { 7945d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 7958a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 7968a2bfdcbSMingming Cao if (error) 7978a2bfdcbSMingming Cao goto cleanup; 7988a2bfdcbSMingming Cao lock_buffer(bs->bh); 7998a2bfdcbSMingming Cao 800ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 801*82939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 802*82939d79SJan Kara 803*82939d79SJan Kara /* 804*82939d79SJan Kara * This must happen under buffer lock for 805*82939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 806*82939d79SJan Kara * block 807*82939d79SJan Kara */ 808*82939d79SJan Kara mb2_cache_entry_delete_block(ext4_mb_cache, hash, 809*82939d79SJan Kara bs->bh->b_blocknr); 810ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 811617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 812ac27a0ecSDave Kleikamp if (!error) { 813ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 814617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), 815ac27a0ecSDave Kleikamp s->here); 8169c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, 8179c191f70ST Makphaibulchoke bs->bh); 818ac27a0ecSDave Kleikamp } 819ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 8206a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 821ac27a0ecSDave Kleikamp goto bad_block; 822ac27a0ecSDave Kleikamp if (!error) 823cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 8240390131bSFrank Mayhar inode, 825ac27a0ecSDave Kleikamp bs->bh); 826ac27a0ecSDave Kleikamp if (error) 827ac27a0ecSDave Kleikamp goto cleanup; 828ac27a0ecSDave Kleikamp goto inserted; 829ac27a0ecSDave Kleikamp } else { 830ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 831ac27a0ecSDave Kleikamp 8328a2bfdcbSMingming Cao unlock_buffer(bs->bh); 833ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 834216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 835ac27a0ecSDave Kleikamp error = -ENOMEM; 836ac27a0ecSDave Kleikamp if (s->base == NULL) 837ac27a0ecSDave Kleikamp goto cleanup; 838ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 839ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 840ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 841ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 842ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 843ac27a0ecSDave Kleikamp } 844ac27a0ecSDave Kleikamp } else { 845ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 846216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 847ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 848ac27a0ecSDave Kleikamp error = -ENOMEM; 849ac27a0ecSDave Kleikamp if (s->base == NULL) 850ac27a0ecSDave Kleikamp goto cleanup; 851617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 852ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 853ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 854ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 855ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 856ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 857ac27a0ecSDave Kleikamp } 858ac27a0ecSDave Kleikamp 859617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 8606a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 861ac27a0ecSDave Kleikamp goto bad_block; 862ac27a0ecSDave Kleikamp if (error) 863ac27a0ecSDave Kleikamp goto cleanup; 864ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 865617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), s->here); 866ac27a0ecSDave Kleikamp 867ac27a0ecSDave Kleikamp inserted: 868ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 869617ba13bSMingming Cao new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); 870ac27a0ecSDave Kleikamp if (new_bh) { 871ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 872ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 873ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 874ac27a0ecSDave Kleikamp else { 875ac27a0ecSDave Kleikamp /* The old block is released after updating 876ac27a0ecSDave Kleikamp the inode. */ 8771231b3a1SLukas Czerner error = dquot_alloc_block(inode, 8781231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 8795dd4056dSChristoph Hellwig if (error) 880ac27a0ecSDave Kleikamp goto cleanup; 8815d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 882617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 883ac27a0ecSDave Kleikamp new_bh); 884ac27a0ecSDave Kleikamp if (error) 885ac27a0ecSDave Kleikamp goto cleanup_dquot; 886ac27a0ecSDave Kleikamp lock_buffer(new_bh); 887*82939d79SJan Kara /* 888*82939d79SJan Kara * We have to be careful about races with 889*82939d79SJan Kara * freeing or rehashing of xattr block. Once we 890*82939d79SJan Kara * hold buffer lock xattr block's state is 891*82939d79SJan Kara * stable so we can check whether the block got 892*82939d79SJan Kara * freed / rehashed or not. Since we unhash 893*82939d79SJan Kara * mbcache entry under buffer lock when freeing 894*82939d79SJan Kara * / rehashing xattr block, checking whether 895*82939d79SJan Kara * entry is still hashed is reliable. 896*82939d79SJan Kara */ 897*82939d79SJan Kara if (hlist_bl_unhashed(&ce->e_hash_list)) { 898*82939d79SJan Kara /* 899*82939d79SJan Kara * Undo everything and check mbcache 900*82939d79SJan Kara * again. 901*82939d79SJan Kara */ 902*82939d79SJan Kara unlock_buffer(new_bh); 903*82939d79SJan Kara dquot_free_block(inode, 904*82939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 905*82939d79SJan Kara 1)); 906*82939d79SJan Kara brelse(new_bh); 907*82939d79SJan Kara mb2_cache_entry_put(ext4_mb_cache, ce); 908*82939d79SJan Kara ce = NULL; 909*82939d79SJan Kara new_bh = NULL; 910*82939d79SJan Kara goto inserted; 911*82939d79SJan Kara } 912e8546d06SMarcin Slusarz le32_add_cpu(&BHDR(new_bh)->h_refcount, 1); 913ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 914ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(new_bh)->h_refcount)); 915ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 916cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 9170390131bSFrank Mayhar inode, 918ac27a0ecSDave Kleikamp new_bh); 919ac27a0ecSDave Kleikamp if (error) 920ac27a0ecSDave Kleikamp goto cleanup_dquot; 921ac27a0ecSDave Kleikamp } 922*82939d79SJan Kara mb2_cache_entry_touch(ext4_mb_cache, ce); 923*82939d79SJan Kara mb2_cache_entry_put(ext4_mb_cache, ce); 924ac27a0ecSDave Kleikamp ce = NULL; 925ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 926ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 927ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 928ac27a0ecSDave Kleikamp new_bh = bs->bh; 929ac27a0ecSDave Kleikamp get_bh(new_bh); 930ac27a0ecSDave Kleikamp } else { 931ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 932fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 933fb0a387dSEric Sandeen 934fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 935d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 936fb0a387dSEric Sandeen 937fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 93812e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 939fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 940fb0a387dSEric Sandeen 94155f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 94255f020dbSAllison Henderson NULL, &error); 943ac27a0ecSDave Kleikamp if (error) 944ac27a0ecSDave Kleikamp goto cleanup; 945fb0a387dSEric Sandeen 94612e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 947fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 948fb0a387dSEric Sandeen 949ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 950ace36ad4SJoe Perches (unsigned long long)block); 951ac27a0ecSDave Kleikamp 952ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 953aebf0243SWang Shilong if (unlikely(!new_bh)) { 954860d21e2STheodore Ts'o error = -ENOMEM; 955ac27a0ecSDave Kleikamp getblk_failed: 9567dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 957e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 958ac27a0ecSDave Kleikamp goto cleanup; 959ac27a0ecSDave Kleikamp } 960ac27a0ecSDave Kleikamp lock_buffer(new_bh); 961617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 962ac27a0ecSDave Kleikamp if (error) { 963ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 964860d21e2STheodore Ts'o error = -EIO; 965ac27a0ecSDave Kleikamp goto getblk_failed; 966ac27a0ecSDave Kleikamp } 967ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 968ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 969ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 9709c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, new_bh); 971cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 9720390131bSFrank Mayhar inode, new_bh); 973ac27a0ecSDave Kleikamp if (error) 974ac27a0ecSDave Kleikamp goto cleanup; 975ac27a0ecSDave Kleikamp } 976ac27a0ecSDave Kleikamp } 977ac27a0ecSDave Kleikamp 978ac27a0ecSDave Kleikamp /* Update the inode. */ 979617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 980ac27a0ecSDave Kleikamp 981ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 982ac27a0ecSDave Kleikamp if (bs->bh && bs->bh != new_bh) 983617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bs->bh); 984ac27a0ecSDave Kleikamp error = 0; 985ac27a0ecSDave Kleikamp 986ac27a0ecSDave Kleikamp cleanup: 987ac27a0ecSDave Kleikamp if (ce) 988*82939d79SJan Kara mb2_cache_entry_put(ext4_mb_cache, ce); 989ac27a0ecSDave Kleikamp brelse(new_bh); 990ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 991ac27a0ecSDave Kleikamp kfree(s->base); 992ac27a0ecSDave Kleikamp 993ac27a0ecSDave Kleikamp return error; 994ac27a0ecSDave Kleikamp 995ac27a0ecSDave Kleikamp cleanup_dquot: 9961231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 997ac27a0ecSDave Kleikamp goto cleanup; 998ac27a0ecSDave Kleikamp 999ac27a0ecSDave Kleikamp bad_block: 100024676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 100124676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1002ac27a0ecSDave Kleikamp goto cleanup; 1003ac27a0ecSDave Kleikamp 1004ac27a0ecSDave Kleikamp #undef header 1005ac27a0ecSDave Kleikamp } 1006ac27a0ecSDave Kleikamp 1007879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 1008617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 1009ac27a0ecSDave Kleikamp { 1010617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 1011617ba13bSMingming Cao struct ext4_inode *raw_inode; 1012ac27a0ecSDave Kleikamp int error; 1013ac27a0ecSDave Kleikamp 1014617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 1015ac27a0ecSDave Kleikamp return 0; 1016617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 1017ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 1018ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 1019ac27a0ecSDave Kleikamp is->s.here = is->s.first; 1020617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 102119f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 1022a0626e75SDarrick J. Wong error = ext4_xattr_check_names(IFIRST(header), is->s.end, 1023a0626e75SDarrick J. Wong IFIRST(header)); 1024ac27a0ecSDave Kleikamp if (error) 1025ac27a0ecSDave Kleikamp return error; 1026ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1027617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 1028ac27a0ecSDave Kleikamp i->name, is->s.end - 1029ac27a0ecSDave Kleikamp (void *)is->s.base, 0); 1030ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1031ac27a0ecSDave Kleikamp return error; 1032ac27a0ecSDave Kleikamp is->s.not_found = error; 1033ac27a0ecSDave Kleikamp } 1034ac27a0ecSDave Kleikamp return 0; 1035ac27a0ecSDave Kleikamp } 1036ac27a0ecSDave Kleikamp 10370d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 10380d812f77STao Ma struct ext4_xattr_info *i, 10390d812f77STao Ma struct ext4_xattr_ibody_find *is) 10400d812f77STao Ma { 10410d812f77STao Ma struct ext4_xattr_ibody_header *header; 10420d812f77STao Ma struct ext4_xattr_search *s = &is->s; 10430d812f77STao Ma int error; 10440d812f77STao Ma 10450d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 10460d812f77STao Ma return -ENOSPC; 10470d812f77STao Ma error = ext4_xattr_set_entry(i, s); 10480d812f77STao Ma if (error) { 10490d812f77STao Ma if (error == -ENOSPC && 10500d812f77STao Ma ext4_has_inline_data(inode)) { 10510d812f77STao Ma error = ext4_try_to_evict_inline_data(handle, inode, 10520d812f77STao Ma EXT4_XATTR_LEN(strlen(i->name) + 10530d812f77STao Ma EXT4_XATTR_SIZE(i->value_len))); 10540d812f77STao Ma if (error) 10550d812f77STao Ma return error; 10560d812f77STao Ma error = ext4_xattr_ibody_find(inode, i, is); 10570d812f77STao Ma if (error) 10580d812f77STao Ma return error; 10590d812f77STao Ma error = ext4_xattr_set_entry(i, s); 10600d812f77STao Ma } 10610d812f77STao Ma if (error) 10620d812f77STao Ma return error; 10630d812f77STao Ma } 10640d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 10650d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 10660d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 10670d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 10680d812f77STao Ma } else { 10690d812f77STao Ma header->h_magic = cpu_to_le32(0); 10700d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 10710d812f77STao Ma } 10720d812f77STao Ma return 0; 10730d812f77STao Ma } 10740d812f77STao Ma 10750d812f77STao Ma static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 1076617ba13bSMingming Cao struct ext4_xattr_info *i, 1077617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 1078ac27a0ecSDave Kleikamp { 1079617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 1080617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 1081ac27a0ecSDave Kleikamp int error; 1082ac27a0ecSDave Kleikamp 1083617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 1084ac27a0ecSDave Kleikamp return -ENOSPC; 1085617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 1086ac27a0ecSDave Kleikamp if (error) 1087ac27a0ecSDave Kleikamp return error; 1088617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 1089ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 1090617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 109119f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 1092ac27a0ecSDave Kleikamp } else { 1093ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 109419f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 1095ac27a0ecSDave Kleikamp } 1096ac27a0ecSDave Kleikamp return 0; 1097ac27a0ecSDave Kleikamp } 1098ac27a0ecSDave Kleikamp 1099ac27a0ecSDave Kleikamp /* 1100617ba13bSMingming Cao * ext4_xattr_set_handle() 1101ac27a0ecSDave Kleikamp * 11026e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 1103ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 1104ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 1105ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 1106ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 1107ac27a0ecSDave Kleikamp * previous to the call, respectively. 1108ac27a0ecSDave Kleikamp * 1109ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1110ac27a0ecSDave Kleikamp */ 1111ac27a0ecSDave Kleikamp int 1112617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 1113ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 1114ac27a0ecSDave Kleikamp int flags) 1115ac27a0ecSDave Kleikamp { 1116617ba13bSMingming Cao struct ext4_xattr_info i = { 1117ac27a0ecSDave Kleikamp .name_index = name_index, 1118ac27a0ecSDave Kleikamp .name = name, 1119ac27a0ecSDave Kleikamp .value = value, 1120ac27a0ecSDave Kleikamp .value_len = value_len, 1121ac27a0ecSDave Kleikamp 1122ac27a0ecSDave Kleikamp }; 1123617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 1124ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1125ac27a0ecSDave Kleikamp }; 1126617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 1127ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1128ac27a0ecSDave Kleikamp }; 11294d20c685SKalpak Shah unsigned long no_expand; 1130ac27a0ecSDave Kleikamp int error; 1131ac27a0ecSDave Kleikamp 1132ac27a0ecSDave Kleikamp if (!name) 1133ac27a0ecSDave Kleikamp return -EINVAL; 1134ac27a0ecSDave Kleikamp if (strlen(name) > 255) 1135ac27a0ecSDave Kleikamp return -ERANGE; 1136617ba13bSMingming Cao down_write(&EXT4_I(inode)->xattr_sem); 113719f5fb7aSTheodore Ts'o no_expand = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND); 113819f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND); 11394d20c685SKalpak Shah 114066543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 114186ebfd08SEric Sandeen if (error) 114286ebfd08SEric Sandeen goto cleanup; 114386ebfd08SEric Sandeen 114419f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 1145617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 1146617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 114719f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 1148ac27a0ecSDave Kleikamp } 1149ac27a0ecSDave Kleikamp 1150617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 1151ac27a0ecSDave Kleikamp if (error) 1152ac27a0ecSDave Kleikamp goto cleanup; 1153ac27a0ecSDave Kleikamp if (is.s.not_found) 1154617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 1155ac27a0ecSDave Kleikamp if (error) 1156ac27a0ecSDave Kleikamp goto cleanup; 1157ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 1158ac27a0ecSDave Kleikamp error = -ENODATA; 1159ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 1160ac27a0ecSDave Kleikamp goto cleanup; 1161ac27a0ecSDave Kleikamp error = 0; 1162ac27a0ecSDave Kleikamp if (!value) 1163ac27a0ecSDave Kleikamp goto cleanup; 1164ac27a0ecSDave Kleikamp } else { 1165ac27a0ecSDave Kleikamp error = -EEXIST; 1166ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 1167ac27a0ecSDave Kleikamp goto cleanup; 1168ac27a0ecSDave Kleikamp } 1169ac27a0ecSDave Kleikamp if (!value) { 1170ac27a0ecSDave Kleikamp if (!is.s.not_found) 1171617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1172ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 1173617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1174ac27a0ecSDave Kleikamp } else { 1175617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1176ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 1177ac27a0ecSDave Kleikamp i.value = NULL; 1178617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1179ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 11807e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 11817e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 11827e01c8e5STiger Yang if (error) 11837e01c8e5STiger Yang goto cleanup; 11847e01c8e5STiger Yang } 1185617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1186ac27a0ecSDave Kleikamp if (error) 1187ac27a0ecSDave Kleikamp goto cleanup; 1188ac27a0ecSDave Kleikamp if (!is.s.not_found) { 1189ac27a0ecSDave Kleikamp i.value = NULL; 1190617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, 1191ac27a0ecSDave Kleikamp &is); 1192ac27a0ecSDave Kleikamp } 1193ac27a0ecSDave Kleikamp } 1194ac27a0ecSDave Kleikamp } 1195ac27a0ecSDave Kleikamp if (!error) { 1196617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 1197ef7f3835SKalpak Shah inode->i_ctime = ext4_current_time(inode); 11986dd4ee7cSKalpak Shah if (!value) 119919f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); 1200617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 1201ac27a0ecSDave Kleikamp /* 1202617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 1203ac27a0ecSDave Kleikamp * error != 0. 1204ac27a0ecSDave Kleikamp */ 1205ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 1206ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 12070390131bSFrank Mayhar ext4_handle_sync(handle); 1208ac27a0ecSDave Kleikamp } 1209ac27a0ecSDave Kleikamp 1210ac27a0ecSDave Kleikamp cleanup: 1211ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 1212ac27a0ecSDave Kleikamp brelse(bs.bh); 12134d20c685SKalpak Shah if (no_expand == 0) 121419f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); 1215617ba13bSMingming Cao up_write(&EXT4_I(inode)->xattr_sem); 1216ac27a0ecSDave Kleikamp return error; 1217ac27a0ecSDave Kleikamp } 1218ac27a0ecSDave Kleikamp 1219ac27a0ecSDave Kleikamp /* 1220617ba13bSMingming Cao * ext4_xattr_set() 1221ac27a0ecSDave Kleikamp * 1222617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 1223ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 1224ac27a0ecSDave Kleikamp * 1225ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1226ac27a0ecSDave Kleikamp */ 1227ac27a0ecSDave Kleikamp int 1228617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 1229ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 1230ac27a0ecSDave Kleikamp { 1231ac27a0ecSDave Kleikamp handle_t *handle; 1232ac27a0ecSDave Kleikamp int error, retries = 0; 123395eaefbdSTheodore Ts'o int credits = ext4_jbd2_credits_xattr(inode); 1234ac27a0ecSDave Kleikamp 1235ac27a0ecSDave Kleikamp retry: 12369924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 1237ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 1238ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 1239ac27a0ecSDave Kleikamp } else { 1240ac27a0ecSDave Kleikamp int error2; 1241ac27a0ecSDave Kleikamp 1242617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 1243ac27a0ecSDave Kleikamp value, value_len, flags); 1244617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 1245ac27a0ecSDave Kleikamp if (error == -ENOSPC && 1246617ba13bSMingming Cao ext4_should_retry_alloc(inode->i_sb, &retries)) 1247ac27a0ecSDave Kleikamp goto retry; 1248ac27a0ecSDave Kleikamp if (error == 0) 1249ac27a0ecSDave Kleikamp error = error2; 1250ac27a0ecSDave Kleikamp } 1251ac27a0ecSDave Kleikamp 1252ac27a0ecSDave Kleikamp return error; 1253ac27a0ecSDave Kleikamp } 1254ac27a0ecSDave Kleikamp 1255ac27a0ecSDave Kleikamp /* 12566dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 12576dd4ee7cSKalpak Shah * i_extra_isize. 12586dd4ee7cSKalpak Shah */ 12596dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 12606dd4ee7cSKalpak Shah int value_offs_shift, void *to, 12616dd4ee7cSKalpak Shah void *from, size_t n, int blocksize) 12626dd4ee7cSKalpak Shah { 12636dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 12646dd4ee7cSKalpak Shah int new_offs; 12656dd4ee7cSKalpak Shah 12666dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 12676dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 12686dd4ee7cSKalpak Shah if (!last->e_value_block && last->e_value_size) { 12696dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 12706dd4ee7cSKalpak Shah value_offs_shift; 12716dd4ee7cSKalpak Shah BUG_ON(new_offs + le32_to_cpu(last->e_value_size) 12726dd4ee7cSKalpak Shah > blocksize); 12736dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 12746dd4ee7cSKalpak Shah } 12756dd4ee7cSKalpak Shah } 12766dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 12776dd4ee7cSKalpak Shah memmove(to, from, n); 12786dd4ee7cSKalpak Shah } 12796dd4ee7cSKalpak Shah 12806dd4ee7cSKalpak Shah /* 12816dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 12826dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 12836dd4ee7cSKalpak Shah */ 12846dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 12856dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 12866dd4ee7cSKalpak Shah { 12876dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 12886dd4ee7cSKalpak Shah struct ext4_xattr_entry *entry, *last, *first; 12896dd4ee7cSKalpak Shah struct buffer_head *bh = NULL; 12906dd4ee7cSKalpak Shah struct ext4_xattr_ibody_find *is = NULL; 12916dd4ee7cSKalpak Shah struct ext4_xattr_block_find *bs = NULL; 12926dd4ee7cSKalpak Shah char *buffer = NULL, *b_entry_name = NULL; 12936dd4ee7cSKalpak Shah size_t min_offs, free; 12947b1b2c1bSTheodore Ts'o int total_ino; 12956dd4ee7cSKalpak Shah void *base, *start, *end; 12966dd4ee7cSKalpak Shah int extra_isize = 0, error = 0, tried_min_extra_isize = 0; 1297ac39849dSAneesh Kumar K.V int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); 12986dd4ee7cSKalpak Shah 12996dd4ee7cSKalpak Shah down_write(&EXT4_I(inode)->xattr_sem); 13006dd4ee7cSKalpak Shah retry: 13016dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) { 13026dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 13036dd4ee7cSKalpak Shah return 0; 13046dd4ee7cSKalpak Shah } 13056dd4ee7cSKalpak Shah 13066dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 13076dd4ee7cSKalpak Shah entry = IFIRST(header); 13086dd4ee7cSKalpak Shah 13096dd4ee7cSKalpak Shah /* 13106dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 13116dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 13126dd4ee7cSKalpak Shah */ 13136dd4ee7cSKalpak Shah 13146dd4ee7cSKalpak Shah base = start = entry; 13156dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 13166dd4ee7cSKalpak Shah min_offs = end - base; 13176dd4ee7cSKalpak Shah last = entry; 13186dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 13196dd4ee7cSKalpak Shah 13206dd4ee7cSKalpak Shah free = ext4_xattr_free_space(last, &min_offs, base, &total_ino); 13216dd4ee7cSKalpak Shah if (free >= new_extra_isize) { 13226dd4ee7cSKalpak Shah entry = IFIRST(header); 13236dd4ee7cSKalpak Shah ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize 13246dd4ee7cSKalpak Shah - new_extra_isize, (void *)raw_inode + 13256dd4ee7cSKalpak Shah EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 13266dd4ee7cSKalpak Shah (void *)header, total_ino, 13276dd4ee7cSKalpak Shah inode->i_sb->s_blocksize); 13286dd4ee7cSKalpak Shah EXT4_I(inode)->i_extra_isize = new_extra_isize; 13296dd4ee7cSKalpak Shah error = 0; 13306dd4ee7cSKalpak Shah goto cleanup; 13316dd4ee7cSKalpak Shah } 13326dd4ee7cSKalpak Shah 13336dd4ee7cSKalpak Shah /* 13346dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 13356dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 13366dd4ee7cSKalpak Shah */ 13376dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 13386dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 13396dd4ee7cSKalpak Shah error = -EIO; 13406dd4ee7cSKalpak Shah if (!bh) 13416dd4ee7cSKalpak Shah goto cleanup; 1342cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 134324676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 134424676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 13456a797d27SDarrick J. Wong error = -EFSCORRUPTED; 13466dd4ee7cSKalpak Shah goto cleanup; 13476dd4ee7cSKalpak Shah } 13486dd4ee7cSKalpak Shah base = BHDR(bh); 13496dd4ee7cSKalpak Shah first = BFIRST(bh); 13506dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 13516dd4ee7cSKalpak Shah min_offs = end - base; 13527b1b2c1bSTheodore Ts'o free = ext4_xattr_free_space(first, &min_offs, base, NULL); 13536dd4ee7cSKalpak Shah if (free < new_extra_isize) { 13546dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 13556dd4ee7cSKalpak Shah tried_min_extra_isize++; 13566dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 13576dd4ee7cSKalpak Shah brelse(bh); 13586dd4ee7cSKalpak Shah goto retry; 13596dd4ee7cSKalpak Shah } 13606dd4ee7cSKalpak Shah error = -1; 13616dd4ee7cSKalpak Shah goto cleanup; 13626dd4ee7cSKalpak Shah } 13636dd4ee7cSKalpak Shah } else { 13646dd4ee7cSKalpak Shah free = inode->i_sb->s_blocksize; 13656dd4ee7cSKalpak Shah } 13666dd4ee7cSKalpak Shah 13676dd4ee7cSKalpak Shah while (new_extra_isize > 0) { 13686dd4ee7cSKalpak Shah size_t offs, size, entry_size; 13696dd4ee7cSKalpak Shah struct ext4_xattr_entry *small_entry = NULL; 13706dd4ee7cSKalpak Shah struct ext4_xattr_info i = { 13716dd4ee7cSKalpak Shah .value = NULL, 13726dd4ee7cSKalpak Shah .value_len = 0, 13736dd4ee7cSKalpak Shah }; 13746dd4ee7cSKalpak Shah unsigned int total_size; /* EA entry size + value size */ 13756dd4ee7cSKalpak Shah unsigned int shift_bytes; /* No. of bytes to shift EAs by? */ 13766dd4ee7cSKalpak Shah unsigned int min_total_size = ~0U; 13776dd4ee7cSKalpak Shah 13786dd4ee7cSKalpak Shah is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 13796dd4ee7cSKalpak Shah bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 13806dd4ee7cSKalpak Shah if (!is || !bs) { 13816dd4ee7cSKalpak Shah error = -ENOMEM; 13826dd4ee7cSKalpak Shah goto cleanup; 13836dd4ee7cSKalpak Shah } 13846dd4ee7cSKalpak Shah 13856dd4ee7cSKalpak Shah is->s.not_found = -ENODATA; 13866dd4ee7cSKalpak Shah bs->s.not_found = -ENODATA; 13876dd4ee7cSKalpak Shah is->iloc.bh = NULL; 13886dd4ee7cSKalpak Shah bs->bh = NULL; 13896dd4ee7cSKalpak Shah 13906dd4ee7cSKalpak Shah last = IFIRST(header); 13916dd4ee7cSKalpak Shah /* Find the entry best suited to be pushed into EA block */ 13926dd4ee7cSKalpak Shah entry = NULL; 13936dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 13946dd4ee7cSKalpak Shah total_size = 13956dd4ee7cSKalpak Shah EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + 13966dd4ee7cSKalpak Shah EXT4_XATTR_LEN(last->e_name_len); 13976dd4ee7cSKalpak Shah if (total_size <= free && total_size < min_total_size) { 13986dd4ee7cSKalpak Shah if (total_size < new_extra_isize) { 13996dd4ee7cSKalpak Shah small_entry = last; 14006dd4ee7cSKalpak Shah } else { 14016dd4ee7cSKalpak Shah entry = last; 14026dd4ee7cSKalpak Shah min_total_size = total_size; 14036dd4ee7cSKalpak Shah } 14046dd4ee7cSKalpak Shah } 14056dd4ee7cSKalpak Shah } 14066dd4ee7cSKalpak Shah 14076dd4ee7cSKalpak Shah if (entry == NULL) { 14086dd4ee7cSKalpak Shah if (small_entry) { 14096dd4ee7cSKalpak Shah entry = small_entry; 14106dd4ee7cSKalpak Shah } else { 14116dd4ee7cSKalpak Shah if (!tried_min_extra_isize && 14126dd4ee7cSKalpak Shah s_min_extra_isize) { 14136dd4ee7cSKalpak Shah tried_min_extra_isize++; 14146dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 14156e4ea8e3SDave Jones kfree(is); is = NULL; 14166e4ea8e3SDave Jones kfree(bs); bs = NULL; 1417dcb9917bSTheodore Ts'o brelse(bh); 14186dd4ee7cSKalpak Shah goto retry; 14196dd4ee7cSKalpak Shah } 14206dd4ee7cSKalpak Shah error = -1; 14216dd4ee7cSKalpak Shah goto cleanup; 14226dd4ee7cSKalpak Shah } 14236dd4ee7cSKalpak Shah } 14246dd4ee7cSKalpak Shah offs = le16_to_cpu(entry->e_value_offs); 14256dd4ee7cSKalpak Shah size = le32_to_cpu(entry->e_value_size); 14266dd4ee7cSKalpak Shah entry_size = EXT4_XATTR_LEN(entry->e_name_len); 14276dd4ee7cSKalpak Shah i.name_index = entry->e_name_index, 14286dd4ee7cSKalpak Shah buffer = kmalloc(EXT4_XATTR_SIZE(size), GFP_NOFS); 14296dd4ee7cSKalpak Shah b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 14306dd4ee7cSKalpak Shah if (!buffer || !b_entry_name) { 14316dd4ee7cSKalpak Shah error = -ENOMEM; 14326dd4ee7cSKalpak Shah goto cleanup; 14336dd4ee7cSKalpak Shah } 14346dd4ee7cSKalpak Shah /* Save the entry name and the entry value */ 14356dd4ee7cSKalpak Shah memcpy(buffer, (void *)IFIRST(header) + offs, 14366dd4ee7cSKalpak Shah EXT4_XATTR_SIZE(size)); 14376dd4ee7cSKalpak Shah memcpy(b_entry_name, entry->e_name, entry->e_name_len); 14386dd4ee7cSKalpak Shah b_entry_name[entry->e_name_len] = '\0'; 14396dd4ee7cSKalpak Shah i.name = b_entry_name; 14406dd4ee7cSKalpak Shah 14416dd4ee7cSKalpak Shah error = ext4_get_inode_loc(inode, &is->iloc); 14426dd4ee7cSKalpak Shah if (error) 14436dd4ee7cSKalpak Shah goto cleanup; 14446dd4ee7cSKalpak Shah 14456dd4ee7cSKalpak Shah error = ext4_xattr_ibody_find(inode, &i, is); 14466dd4ee7cSKalpak Shah if (error) 14476dd4ee7cSKalpak Shah goto cleanup; 14486dd4ee7cSKalpak Shah 14496dd4ee7cSKalpak Shah /* Remove the chosen entry from the inode */ 14506dd4ee7cSKalpak Shah error = ext4_xattr_ibody_set(handle, inode, &i, is); 14519aaab058SRoel Kluin if (error) 14529aaab058SRoel Kluin goto cleanup; 14536dd4ee7cSKalpak Shah 14546dd4ee7cSKalpak Shah entry = IFIRST(header); 14556dd4ee7cSKalpak Shah if (entry_size + EXT4_XATTR_SIZE(size) >= new_extra_isize) 14566dd4ee7cSKalpak Shah shift_bytes = new_extra_isize; 14576dd4ee7cSKalpak Shah else 14586dd4ee7cSKalpak Shah shift_bytes = entry_size + size; 14596dd4ee7cSKalpak Shah /* Adjust the offsets and shift the remaining entries ahead */ 14606dd4ee7cSKalpak Shah ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize - 14616dd4ee7cSKalpak Shah shift_bytes, (void *)raw_inode + 14626dd4ee7cSKalpak Shah EXT4_GOOD_OLD_INODE_SIZE + extra_isize + shift_bytes, 14636dd4ee7cSKalpak Shah (void *)header, total_ino - entry_size, 14646dd4ee7cSKalpak Shah inode->i_sb->s_blocksize); 14656dd4ee7cSKalpak Shah 14666dd4ee7cSKalpak Shah extra_isize += shift_bytes; 14676dd4ee7cSKalpak Shah new_extra_isize -= shift_bytes; 14686dd4ee7cSKalpak Shah EXT4_I(inode)->i_extra_isize = extra_isize; 14696dd4ee7cSKalpak Shah 14706dd4ee7cSKalpak Shah i.name = b_entry_name; 14716dd4ee7cSKalpak Shah i.value = buffer; 1472ac39849dSAneesh Kumar K.V i.value_len = size; 14736dd4ee7cSKalpak Shah error = ext4_xattr_block_find(inode, &i, bs); 14746dd4ee7cSKalpak Shah if (error) 14756dd4ee7cSKalpak Shah goto cleanup; 14766dd4ee7cSKalpak Shah 14776dd4ee7cSKalpak Shah /* Add entry which was removed from the inode into the block */ 14786dd4ee7cSKalpak Shah error = ext4_xattr_block_set(handle, inode, &i, bs); 14796dd4ee7cSKalpak Shah if (error) 14806dd4ee7cSKalpak Shah goto cleanup; 14816dd4ee7cSKalpak Shah kfree(b_entry_name); 14826dd4ee7cSKalpak Shah kfree(buffer); 1483d3533d72SJulia Lawall b_entry_name = NULL; 1484d3533d72SJulia Lawall buffer = NULL; 14856dd4ee7cSKalpak Shah brelse(is->iloc.bh); 14866dd4ee7cSKalpak Shah kfree(is); 14876dd4ee7cSKalpak Shah kfree(bs); 14886dd4ee7cSKalpak Shah } 14896dd4ee7cSKalpak Shah brelse(bh); 14906dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 14916dd4ee7cSKalpak Shah return 0; 14926dd4ee7cSKalpak Shah 14936dd4ee7cSKalpak Shah cleanup: 14946dd4ee7cSKalpak Shah kfree(b_entry_name); 14956dd4ee7cSKalpak Shah kfree(buffer); 14966dd4ee7cSKalpak Shah if (is) 14976dd4ee7cSKalpak Shah brelse(is->iloc.bh); 14986dd4ee7cSKalpak Shah kfree(is); 14996dd4ee7cSKalpak Shah kfree(bs); 15006dd4ee7cSKalpak Shah brelse(bh); 15016dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 15026dd4ee7cSKalpak Shah return error; 15036dd4ee7cSKalpak Shah } 15046dd4ee7cSKalpak Shah 15056dd4ee7cSKalpak Shah 15066dd4ee7cSKalpak Shah 15076dd4ee7cSKalpak Shah /* 1508617ba13bSMingming Cao * ext4_xattr_delete_inode() 1509ac27a0ecSDave Kleikamp * 1510ac27a0ecSDave Kleikamp * Free extended attribute resources associated with this inode. This 1511ac27a0ecSDave Kleikamp * is called immediately before an inode is freed. We have exclusive 1512ac27a0ecSDave Kleikamp * access to the inode. 1513ac27a0ecSDave Kleikamp */ 1514ac27a0ecSDave Kleikamp void 1515617ba13bSMingming Cao ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) 1516ac27a0ecSDave Kleikamp { 1517ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 1518ac27a0ecSDave Kleikamp 1519617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 1520ac27a0ecSDave Kleikamp goto cleanup; 1521617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 1522ac27a0ecSDave Kleikamp if (!bh) { 152324676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 152424676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1525ac27a0ecSDave Kleikamp goto cleanup; 1526ac27a0ecSDave Kleikamp } 1527617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 1528ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) { 152924676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 153024676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1531ac27a0ecSDave Kleikamp goto cleanup; 1532ac27a0ecSDave Kleikamp } 1533617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bh); 1534617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 1535ac27a0ecSDave Kleikamp 1536ac27a0ecSDave Kleikamp cleanup: 1537ac27a0ecSDave Kleikamp brelse(bh); 1538ac27a0ecSDave Kleikamp } 1539ac27a0ecSDave Kleikamp 1540ac27a0ecSDave Kleikamp /* 1541617ba13bSMingming Cao * ext4_xattr_cache_insert() 1542ac27a0ecSDave Kleikamp * 1543ac27a0ecSDave Kleikamp * Create a new entry in the extended attribute cache, and insert 1544ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 1545ac27a0ecSDave Kleikamp * 1546ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1547ac27a0ecSDave Kleikamp */ 1548ac27a0ecSDave Kleikamp static void 1549*82939d79SJan Kara ext4_xattr_cache_insert(struct mb2_cache *ext4_mb_cache, struct buffer_head *bh) 1550ac27a0ecSDave Kleikamp { 1551ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(BHDR(bh)->h_hash); 1552ac27a0ecSDave Kleikamp int error; 1553ac27a0ecSDave Kleikamp 1554*82939d79SJan Kara error = mb2_cache_entry_create(ext4_mb_cache, GFP_NOFS, hash, 1555*82939d79SJan Kara bh->b_blocknr); 1556ac27a0ecSDave Kleikamp if (error) { 1557*82939d79SJan Kara if (error == -EBUSY) 1558ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 1559*82939d79SJan Kara } else 1560ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 1561ac27a0ecSDave Kleikamp } 1562ac27a0ecSDave Kleikamp 1563ac27a0ecSDave Kleikamp /* 1564617ba13bSMingming Cao * ext4_xattr_cmp() 1565ac27a0ecSDave Kleikamp * 1566ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 1567ac27a0ecSDave Kleikamp * 1568ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 1569ac27a0ecSDave Kleikamp * a negative error number on errors. 1570ac27a0ecSDave Kleikamp */ 1571ac27a0ecSDave Kleikamp static int 1572617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 1573617ba13bSMingming Cao struct ext4_xattr_header *header2) 1574ac27a0ecSDave Kleikamp { 1575617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 1576ac27a0ecSDave Kleikamp 1577ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 1578ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 1579ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 1580ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 1581ac27a0ecSDave Kleikamp return 1; 1582ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 1583ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 1584ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 1585ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 1586ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 1587ac27a0ecSDave Kleikamp return 1; 1588ac27a0ecSDave Kleikamp if (entry1->e_value_block != 0 || entry2->e_value_block != 0) 15896a797d27SDarrick J. Wong return -EFSCORRUPTED; 1590ac27a0ecSDave Kleikamp if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 1591ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 1592ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 1593ac27a0ecSDave Kleikamp return 1; 1594ac27a0ecSDave Kleikamp 1595617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 1596617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 1597ac27a0ecSDave Kleikamp } 1598ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 1599ac27a0ecSDave Kleikamp return 1; 1600ac27a0ecSDave Kleikamp return 0; 1601ac27a0ecSDave Kleikamp } 1602ac27a0ecSDave Kleikamp 1603ac27a0ecSDave Kleikamp /* 1604617ba13bSMingming Cao * ext4_xattr_cache_find() 1605ac27a0ecSDave Kleikamp * 1606ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 1607ac27a0ecSDave Kleikamp * 1608ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 1609ac27a0ecSDave Kleikamp * not found or an error occurred. 1610ac27a0ecSDave Kleikamp */ 1611ac27a0ecSDave Kleikamp static struct buffer_head * 1612617ba13bSMingming Cao ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, 1613*82939d79SJan Kara struct mb2_cache_entry **pce) 1614ac27a0ecSDave Kleikamp { 1615ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 1616*82939d79SJan Kara struct mb2_cache_entry *ce; 1617*82939d79SJan Kara struct mb2_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 1618ac27a0ecSDave Kleikamp 1619ac27a0ecSDave Kleikamp if (!header->h_hash) 1620ac27a0ecSDave Kleikamp return NULL; /* never share */ 1621ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 1622*82939d79SJan Kara ce = mb2_cache_entry_find_first(ext4_mb_cache, hash); 1623ac27a0ecSDave Kleikamp while (ce) { 1624ac27a0ecSDave Kleikamp struct buffer_head *bh; 1625ac27a0ecSDave Kleikamp 1626ac27a0ecSDave Kleikamp bh = sb_bread(inode->i_sb, ce->e_block); 1627ac27a0ecSDave Kleikamp if (!bh) { 162824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 162924676da4STheodore Ts'o (unsigned long) ce->e_block); 1630ac27a0ecSDave Kleikamp } else if (le32_to_cpu(BHDR(bh)->h_refcount) >= 1631617ba13bSMingming Cao EXT4_XATTR_REFCOUNT_MAX) { 1632ac27a0ecSDave Kleikamp ea_idebug(inode, "block %lu refcount %d>=%d", 1633ac27a0ecSDave Kleikamp (unsigned long) ce->e_block, 1634ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount), 1635617ba13bSMingming Cao EXT4_XATTR_REFCOUNT_MAX); 1636617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 1637ac27a0ecSDave Kleikamp *pce = ce; 1638ac27a0ecSDave Kleikamp return bh; 1639ac27a0ecSDave Kleikamp } 1640ac27a0ecSDave Kleikamp brelse(bh); 1641*82939d79SJan Kara ce = mb2_cache_entry_find_next(ext4_mb_cache, ce); 1642ac27a0ecSDave Kleikamp } 1643ac27a0ecSDave Kleikamp return NULL; 1644ac27a0ecSDave Kleikamp } 1645ac27a0ecSDave Kleikamp 1646ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 1647ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 1648ac27a0ecSDave Kleikamp 1649ac27a0ecSDave Kleikamp /* 1650617ba13bSMingming Cao * ext4_xattr_hash_entry() 1651ac27a0ecSDave Kleikamp * 1652ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 1653ac27a0ecSDave Kleikamp */ 1654617ba13bSMingming Cao static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, 1655617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1656ac27a0ecSDave Kleikamp { 1657ac27a0ecSDave Kleikamp __u32 hash = 0; 1658ac27a0ecSDave Kleikamp char *name = entry->e_name; 1659ac27a0ecSDave Kleikamp int n; 1660ac27a0ecSDave Kleikamp 1661ac27a0ecSDave Kleikamp for (n = 0; n < entry->e_name_len; n++) { 1662ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 1663ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 1664ac27a0ecSDave Kleikamp *name++; 1665ac27a0ecSDave Kleikamp } 1666ac27a0ecSDave Kleikamp 1667ac27a0ecSDave Kleikamp if (entry->e_value_block == 0 && entry->e_value_size != 0) { 1668ac27a0ecSDave Kleikamp __le32 *value = (__le32 *)((char *)header + 1669ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs)); 1670ac27a0ecSDave Kleikamp for (n = (le32_to_cpu(entry->e_value_size) + 1671617ba13bSMingming Cao EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { 1672ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 1673ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 1674ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 1675ac27a0ecSDave Kleikamp } 1676ac27a0ecSDave Kleikamp } 1677ac27a0ecSDave Kleikamp entry->e_hash = cpu_to_le32(hash); 1678ac27a0ecSDave Kleikamp } 1679ac27a0ecSDave Kleikamp 1680ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 1681ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 1682ac27a0ecSDave Kleikamp 1683ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 1684ac27a0ecSDave Kleikamp 1685ac27a0ecSDave Kleikamp /* 1686617ba13bSMingming Cao * ext4_xattr_rehash() 1687ac27a0ecSDave Kleikamp * 1688ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 1689ac27a0ecSDave Kleikamp */ 1690617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *header, 1691617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1692ac27a0ecSDave Kleikamp { 1693617ba13bSMingming Cao struct ext4_xattr_entry *here; 1694ac27a0ecSDave Kleikamp __u32 hash = 0; 1695ac27a0ecSDave Kleikamp 1696617ba13bSMingming Cao ext4_xattr_hash_entry(header, entry); 1697ac27a0ecSDave Kleikamp here = ENTRY(header+1); 1698ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 1699ac27a0ecSDave Kleikamp if (!here->e_hash) { 1700ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 1701ac27a0ecSDave Kleikamp hash = 0; 1702ac27a0ecSDave Kleikamp break; 1703ac27a0ecSDave Kleikamp } 1704ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 1705ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 1706ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 1707617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 1708ac27a0ecSDave Kleikamp } 1709ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 1710ac27a0ecSDave Kleikamp } 1711ac27a0ecSDave Kleikamp 1712ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 1713ac27a0ecSDave Kleikamp 17149c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 17159c191f70ST Makphaibulchoke 1716*82939d79SJan Kara struct mb2_cache * 1717*82939d79SJan Kara ext4_xattr_create_cache(void) 1718ac27a0ecSDave Kleikamp { 1719*82939d79SJan Kara return mb2_cache_create(HASH_BUCKET_BITS); 1720ac27a0ecSDave Kleikamp } 1721ac27a0ecSDave Kleikamp 1722*82939d79SJan Kara void ext4_xattr_destroy_cache(struct mb2_cache *cache) 1723ac27a0ecSDave Kleikamp { 17249c191f70ST Makphaibulchoke if (cache) 1725*82939d79SJan Kara mb2_cache_destroy(cache); 1726ac27a0ecSDave Kleikamp } 17279c191f70ST Makphaibulchoke 1728