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> 56ac27a0ecSDave Kleikamp #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 { \ 71ac27a0ecSDave Kleikamp char b[BDEVNAME_SIZE]; \ 72ac27a0ecSDave Kleikamp printk(KERN_DEBUG "block %s:%lu: ", \ 73ac27a0ecSDave Kleikamp bdevname(bh->b_bdev, b), \ 74ac27a0ecSDave Kleikamp (unsigned long) bh->b_blocknr); \ 75ac27a0ecSDave Kleikamp printk(f); \ 76ac27a0ecSDave Kleikamp printk("\n"); \ 77ac27a0ecSDave Kleikamp } while (0) 78ac27a0ecSDave Kleikamp #else 79ace36ad4SJoe Perches # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 80ace36ad4SJoe Perches # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 81ac27a0ecSDave Kleikamp #endif 82ac27a0ecSDave Kleikamp 839c191f70ST Makphaibulchoke static void ext4_xattr_cache_insert(struct mb_cache *, struct buffer_head *); 84617ba13bSMingming Cao static struct buffer_head *ext4_xattr_cache_find(struct inode *, 85617ba13bSMingming Cao struct ext4_xattr_header *, 86ac27a0ecSDave Kleikamp struct mb_cache_entry **); 87617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *, 88617ba13bSMingming Cao struct ext4_xattr_entry *); 89431547b3SChristoph Hellwig static int ext4_xattr_list(struct dentry *dentry, char *buffer, 90d3a95d47SMingming Cao size_t buffer_size); 91ac27a0ecSDave Kleikamp 9211e27528SStephen Hemminger static const struct xattr_handler *ext4_xattr_handler_map[] = { 93617ba13bSMingming Cao [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, 9403010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 9564e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, 9664e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, 97ac27a0ecSDave Kleikamp #endif 98617ba13bSMingming Cao [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, 9903010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 100617ba13bSMingming Cao [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, 101ac27a0ecSDave Kleikamp #endif 102ac27a0ecSDave Kleikamp }; 103ac27a0ecSDave Kleikamp 10411e27528SStephen Hemminger const struct xattr_handler *ext4_xattr_handlers[] = { 105617ba13bSMingming Cao &ext4_xattr_user_handler, 106617ba13bSMingming Cao &ext4_xattr_trusted_handler, 10703010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 10864e178a7SChristoph Hellwig &posix_acl_access_xattr_handler, 10964e178a7SChristoph Hellwig &posix_acl_default_xattr_handler, 110ac27a0ecSDave Kleikamp #endif 11103010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 112617ba13bSMingming Cao &ext4_xattr_security_handler, 113ac27a0ecSDave Kleikamp #endif 114ac27a0ecSDave Kleikamp NULL 115ac27a0ecSDave Kleikamp }; 116ac27a0ecSDave Kleikamp 1179c191f70ST Makphaibulchoke #define EXT4_GET_MB_CACHE(inode) (((struct ext4_sb_info *) \ 1189c191f70ST Makphaibulchoke inode->i_sb->s_fs_info)->s_mb_cache) 1199c191f70ST Makphaibulchoke 120cc8e94fdSDarrick J. Wong static __le32 ext4_xattr_block_csum(struct inode *inode, 121cc8e94fdSDarrick J. Wong sector_t block_nr, 122cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 123cc8e94fdSDarrick J. Wong { 124cc8e94fdSDarrick J. Wong struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 125d6a77105STheodore Ts'o __u32 csum; 126d6a77105STheodore Ts'o __le32 save_csum; 127d6a77105STheodore Ts'o __le64 dsk_block_nr = cpu_to_le64(block_nr); 128cc8e94fdSDarrick J. Wong 129d6a77105STheodore Ts'o save_csum = hdr->h_checksum; 130cc8e94fdSDarrick J. Wong hdr->h_checksum = 0; 131d6a77105STheodore Ts'o csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, 132d6a77105STheodore Ts'o sizeof(dsk_block_nr)); 133cc8e94fdSDarrick J. Wong csum = ext4_chksum(sbi, csum, (__u8 *)hdr, 134cc8e94fdSDarrick J. Wong EXT4_BLOCK_SIZE(inode->i_sb)); 13541eb70ddSTao Ma 136d6a77105STheodore Ts'o hdr->h_checksum = save_csum; 137cc8e94fdSDarrick J. Wong return cpu_to_le32(csum); 138cc8e94fdSDarrick J. Wong } 139cc8e94fdSDarrick J. Wong 140cc8e94fdSDarrick J. Wong static int ext4_xattr_block_csum_verify(struct inode *inode, 141cc8e94fdSDarrick J. Wong sector_t block_nr, 142cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 143cc8e94fdSDarrick J. Wong { 1449aa5d32bSDmitry Monakhov if (ext4_has_metadata_csum(inode->i_sb) && 145cc8e94fdSDarrick J. Wong (hdr->h_checksum != ext4_xattr_block_csum(inode, block_nr, hdr))) 146cc8e94fdSDarrick J. Wong return 0; 147cc8e94fdSDarrick J. Wong return 1; 148cc8e94fdSDarrick J. Wong } 149cc8e94fdSDarrick J. Wong 150cc8e94fdSDarrick J. Wong static void ext4_xattr_block_csum_set(struct inode *inode, 151cc8e94fdSDarrick J. Wong sector_t block_nr, 152cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 153cc8e94fdSDarrick J. Wong { 1549aa5d32bSDmitry Monakhov if (!ext4_has_metadata_csum(inode->i_sb)) 155cc8e94fdSDarrick J. Wong return; 156cc8e94fdSDarrick J. Wong 157cc8e94fdSDarrick J. Wong hdr->h_checksum = ext4_xattr_block_csum(inode, block_nr, hdr); 158cc8e94fdSDarrick J. Wong } 159cc8e94fdSDarrick J. Wong 160cc8e94fdSDarrick J. Wong static inline int ext4_handle_dirty_xattr_block(handle_t *handle, 161cc8e94fdSDarrick J. Wong struct inode *inode, 162cc8e94fdSDarrick J. Wong struct buffer_head *bh) 163cc8e94fdSDarrick J. Wong { 164cc8e94fdSDarrick J. Wong ext4_xattr_block_csum_set(inode, bh->b_blocknr, BHDR(bh)); 165cc8e94fdSDarrick J. Wong return ext4_handle_dirty_metadata(handle, inode, bh); 166cc8e94fdSDarrick J. Wong } 167cc8e94fdSDarrick J. Wong 16811e27528SStephen Hemminger static inline const struct xattr_handler * 169617ba13bSMingming Cao ext4_xattr_handler(int name_index) 170ac27a0ecSDave Kleikamp { 17111e27528SStephen Hemminger const struct xattr_handler *handler = NULL; 172ac27a0ecSDave Kleikamp 173617ba13bSMingming Cao if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) 174617ba13bSMingming Cao handler = ext4_xattr_handler_map[name_index]; 175ac27a0ecSDave Kleikamp return handler; 176ac27a0ecSDave Kleikamp } 177ac27a0ecSDave Kleikamp 178ac27a0ecSDave Kleikamp /* 179ac27a0ecSDave Kleikamp * Inode operation listxattr() 180ac27a0ecSDave Kleikamp * 1812b0143b5SDavid Howells * d_inode(dentry)->i_mutex: don't care 182ac27a0ecSDave Kleikamp */ 183ac27a0ecSDave Kleikamp ssize_t 184617ba13bSMingming Cao ext4_listxattr(struct dentry *dentry, char *buffer, size_t size) 185ac27a0ecSDave Kleikamp { 186431547b3SChristoph Hellwig return ext4_xattr_list(dentry, buffer, size); 187ac27a0ecSDave Kleikamp } 188ac27a0ecSDave Kleikamp 189ac27a0ecSDave Kleikamp static int 190a0626e75SDarrick J. Wong ext4_xattr_check_names(struct ext4_xattr_entry *entry, void *end, 191a0626e75SDarrick J. Wong void *value_start) 192ac27a0ecSDave Kleikamp { 193a0626e75SDarrick J. Wong struct ext4_xattr_entry *e = entry; 194a0626e75SDarrick J. Wong 195a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(e)) { 196a0626e75SDarrick J. Wong struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); 197ac27a0ecSDave Kleikamp if ((void *)next >= end) 198*6a797d27SDarrick J. Wong return -EFSCORRUPTED; 199a0626e75SDarrick J. Wong e = next; 200ac27a0ecSDave Kleikamp } 201a0626e75SDarrick J. Wong 202a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(entry)) { 203a0626e75SDarrick J. Wong if (entry->e_value_size != 0 && 204a0626e75SDarrick J. Wong (value_start + le16_to_cpu(entry->e_value_offs) < 205a0626e75SDarrick J. Wong (void *)e + sizeof(__u32) || 206a0626e75SDarrick J. Wong value_start + le16_to_cpu(entry->e_value_offs) + 207a0626e75SDarrick J. Wong le32_to_cpu(entry->e_value_size) > end)) 208*6a797d27SDarrick J. Wong return -EFSCORRUPTED; 209a0626e75SDarrick J. Wong entry = EXT4_XATTR_NEXT(entry); 210a0626e75SDarrick J. Wong } 211a0626e75SDarrick J. Wong 212ac27a0ecSDave Kleikamp return 0; 213ac27a0ecSDave Kleikamp } 214ac27a0ecSDave Kleikamp 215ac27a0ecSDave Kleikamp static inline int 216cc8e94fdSDarrick J. Wong ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) 217ac27a0ecSDave Kleikamp { 218cc8e94fdSDarrick J. Wong int error; 219cc8e94fdSDarrick J. Wong 220cc8e94fdSDarrick J. Wong if (buffer_verified(bh)) 221cc8e94fdSDarrick J. Wong return 0; 222cc8e94fdSDarrick J. Wong 223617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 224ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) 225*6a797d27SDarrick J. Wong return -EFSCORRUPTED; 226cc8e94fdSDarrick J. Wong if (!ext4_xattr_block_csum_verify(inode, bh->b_blocknr, BHDR(bh))) 227*6a797d27SDarrick J. Wong return -EFSBADCRC; 228a0626e75SDarrick J. Wong error = ext4_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size, 229a0626e75SDarrick J. Wong bh->b_data); 230cc8e94fdSDarrick J. Wong if (!error) 231cc8e94fdSDarrick J. Wong set_buffer_verified(bh); 232cc8e94fdSDarrick J. Wong return error; 233ac27a0ecSDave Kleikamp } 234ac27a0ecSDave Kleikamp 235ac27a0ecSDave Kleikamp static inline int 236617ba13bSMingming Cao ext4_xattr_check_entry(struct ext4_xattr_entry *entry, size_t size) 237ac27a0ecSDave Kleikamp { 238ac27a0ecSDave Kleikamp size_t value_size = le32_to_cpu(entry->e_value_size); 239ac27a0ecSDave Kleikamp 240ac27a0ecSDave Kleikamp if (entry->e_value_block != 0 || value_size > size || 241ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs) + value_size > size) 242*6a797d27SDarrick J. Wong return -EFSCORRUPTED; 243ac27a0ecSDave Kleikamp return 0; 244ac27a0ecSDave Kleikamp } 245ac27a0ecSDave Kleikamp 246ac27a0ecSDave Kleikamp static int 247617ba13bSMingming Cao ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, 248ac27a0ecSDave Kleikamp const char *name, size_t size, int sorted) 249ac27a0ecSDave Kleikamp { 250617ba13bSMingming Cao struct ext4_xattr_entry *entry; 251ac27a0ecSDave Kleikamp size_t name_len; 252ac27a0ecSDave Kleikamp int cmp = 1; 253ac27a0ecSDave Kleikamp 254ac27a0ecSDave Kleikamp if (name == NULL) 255ac27a0ecSDave Kleikamp return -EINVAL; 256ac27a0ecSDave Kleikamp name_len = strlen(name); 257ac27a0ecSDave Kleikamp entry = *pentry; 258617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 259ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 260ac27a0ecSDave Kleikamp if (!cmp) 261ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 262ac27a0ecSDave Kleikamp if (!cmp) 263ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 264ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 265ac27a0ecSDave Kleikamp break; 266ac27a0ecSDave Kleikamp } 267ac27a0ecSDave Kleikamp *pentry = entry; 268617ba13bSMingming Cao if (!cmp && ext4_xattr_check_entry(entry, size)) 269*6a797d27SDarrick J. Wong return -EFSCORRUPTED; 270ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 271ac27a0ecSDave Kleikamp } 272ac27a0ecSDave Kleikamp 273ac27a0ecSDave Kleikamp static int 274617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 275ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 276ac27a0ecSDave Kleikamp { 277ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 278617ba13bSMingming Cao struct ext4_xattr_entry *entry; 279ac27a0ecSDave Kleikamp size_t size; 280ac27a0ecSDave Kleikamp int error; 2819c191f70ST Makphaibulchoke struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 282ac27a0ecSDave Kleikamp 283ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 284ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 285ac27a0ecSDave Kleikamp 286ac27a0ecSDave Kleikamp error = -ENODATA; 287617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 288ac27a0ecSDave Kleikamp goto cleanup; 289ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 290ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 291617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 292ac27a0ecSDave Kleikamp if (!bh) 293ac27a0ecSDave Kleikamp goto cleanup; 294ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 295ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 296cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 29712062dddSEric Sandeen bad_block: 29824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 299617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 300*6a797d27SDarrick J. Wong error = -EFSCORRUPTED; 301ac27a0ecSDave Kleikamp goto cleanup; 302ac27a0ecSDave Kleikamp } 3039c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, bh); 304ac27a0ecSDave Kleikamp entry = BFIRST(bh); 305617ba13bSMingming Cao error = ext4_xattr_find_entry(&entry, name_index, name, bh->b_size, 1); 306*6a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 307ac27a0ecSDave Kleikamp goto bad_block; 308ac27a0ecSDave Kleikamp if (error) 309ac27a0ecSDave Kleikamp goto cleanup; 310ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 311ac27a0ecSDave Kleikamp if (buffer) { 312ac27a0ecSDave Kleikamp error = -ERANGE; 313ac27a0ecSDave Kleikamp if (size > buffer_size) 314ac27a0ecSDave Kleikamp goto cleanup; 315ac27a0ecSDave Kleikamp memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs), 316ac27a0ecSDave Kleikamp size); 317ac27a0ecSDave Kleikamp } 318ac27a0ecSDave Kleikamp error = size; 319ac27a0ecSDave Kleikamp 320ac27a0ecSDave Kleikamp cleanup: 321ac27a0ecSDave Kleikamp brelse(bh); 322ac27a0ecSDave Kleikamp return error; 323ac27a0ecSDave Kleikamp } 324ac27a0ecSDave Kleikamp 325879b3825STao Ma int 326617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 327ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 328ac27a0ecSDave Kleikamp { 329617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 330617ba13bSMingming Cao struct ext4_xattr_entry *entry; 331617ba13bSMingming Cao struct ext4_inode *raw_inode; 332617ba13bSMingming Cao struct ext4_iloc iloc; 333ac27a0ecSDave Kleikamp size_t size; 334ac27a0ecSDave Kleikamp void *end; 335ac27a0ecSDave Kleikamp int error; 336ac27a0ecSDave Kleikamp 33719f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 338ac27a0ecSDave Kleikamp return -ENODATA; 339617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 340ac27a0ecSDave Kleikamp if (error) 341ac27a0ecSDave Kleikamp return error; 342617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 343ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 344ac27a0ecSDave Kleikamp entry = IFIRST(header); 345617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 346a0626e75SDarrick J. Wong error = ext4_xattr_check_names(entry, end, entry); 347ac27a0ecSDave Kleikamp if (error) 348ac27a0ecSDave Kleikamp goto cleanup; 349617ba13bSMingming Cao error = ext4_xattr_find_entry(&entry, name_index, name, 350ac27a0ecSDave Kleikamp end - (void *)entry, 0); 351ac27a0ecSDave Kleikamp if (error) 352ac27a0ecSDave Kleikamp goto cleanup; 353ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 354ac27a0ecSDave Kleikamp if (buffer) { 355ac27a0ecSDave Kleikamp error = -ERANGE; 356ac27a0ecSDave Kleikamp if (size > buffer_size) 357ac27a0ecSDave Kleikamp goto cleanup; 358ac27a0ecSDave Kleikamp memcpy(buffer, (void *)IFIRST(header) + 359ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs), size); 360ac27a0ecSDave Kleikamp } 361ac27a0ecSDave Kleikamp error = size; 362ac27a0ecSDave Kleikamp 363ac27a0ecSDave Kleikamp cleanup: 364ac27a0ecSDave Kleikamp brelse(iloc.bh); 365ac27a0ecSDave Kleikamp return error; 366ac27a0ecSDave Kleikamp } 367ac27a0ecSDave Kleikamp 368ac27a0ecSDave Kleikamp /* 369617ba13bSMingming Cao * ext4_xattr_get() 370ac27a0ecSDave Kleikamp * 371ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 372ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 373ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 374ac27a0ecSDave Kleikamp * 375ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 376ac27a0ecSDave Kleikamp * used / required on success. 377ac27a0ecSDave Kleikamp */ 378ac27a0ecSDave Kleikamp int 379617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 380ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 381ac27a0ecSDave Kleikamp { 382ac27a0ecSDave Kleikamp int error; 383ac27a0ecSDave Kleikamp 384230b8c1aSZhang Zhen if (strlen(name) > 255) 385230b8c1aSZhang Zhen return -ERANGE; 386230b8c1aSZhang Zhen 387617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 388617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 389ac27a0ecSDave Kleikamp buffer_size); 390ac27a0ecSDave Kleikamp if (error == -ENODATA) 391617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 392ac27a0ecSDave Kleikamp buffer_size); 393617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 394ac27a0ecSDave Kleikamp return error; 395ac27a0ecSDave Kleikamp } 396ac27a0ecSDave Kleikamp 397ac27a0ecSDave Kleikamp static int 398431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 399ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 400ac27a0ecSDave Kleikamp { 401ac27a0ecSDave Kleikamp size_t rest = buffer_size; 402ac27a0ecSDave Kleikamp 403617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 40411e27528SStephen Hemminger const struct xattr_handler *handler = 405617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 406ac27a0ecSDave Kleikamp 407ac27a0ecSDave Kleikamp if (handler) { 408431547b3SChristoph Hellwig size_t size = handler->list(dentry, buffer, rest, 409ac27a0ecSDave Kleikamp entry->e_name, 410431547b3SChristoph Hellwig entry->e_name_len, 411431547b3SChristoph Hellwig handler->flags); 412ac27a0ecSDave Kleikamp if (buffer) { 413ac27a0ecSDave Kleikamp if (size > rest) 414ac27a0ecSDave Kleikamp return -ERANGE; 415ac27a0ecSDave Kleikamp buffer += size; 416ac27a0ecSDave Kleikamp } 417ac27a0ecSDave Kleikamp rest -= size; 418ac27a0ecSDave Kleikamp } 419ac27a0ecSDave Kleikamp } 420ac27a0ecSDave Kleikamp return buffer_size - rest; 421ac27a0ecSDave Kleikamp } 422ac27a0ecSDave Kleikamp 423ac27a0ecSDave Kleikamp static int 424431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 425ac27a0ecSDave Kleikamp { 4262b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 427ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 428ac27a0ecSDave Kleikamp int error; 4299c191f70ST Makphaibulchoke struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 430ac27a0ecSDave Kleikamp 431ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 432ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 433ac27a0ecSDave Kleikamp 434ac27a0ecSDave Kleikamp error = 0; 435617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 436ac27a0ecSDave Kleikamp goto cleanup; 437ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 438ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 439617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 440ac27a0ecSDave Kleikamp error = -EIO; 441ac27a0ecSDave Kleikamp if (!bh) 442ac27a0ecSDave Kleikamp goto cleanup; 443ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 444ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 445cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 44624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 447617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 448*6a797d27SDarrick J. Wong error = -EFSCORRUPTED; 449ac27a0ecSDave Kleikamp goto cleanup; 450ac27a0ecSDave Kleikamp } 4519c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, bh); 452431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); 453ac27a0ecSDave Kleikamp 454ac27a0ecSDave Kleikamp cleanup: 455ac27a0ecSDave Kleikamp brelse(bh); 456ac27a0ecSDave Kleikamp 457ac27a0ecSDave Kleikamp return error; 458ac27a0ecSDave Kleikamp } 459ac27a0ecSDave Kleikamp 460ac27a0ecSDave Kleikamp static int 461431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 462ac27a0ecSDave Kleikamp { 4632b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 464617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 465617ba13bSMingming Cao struct ext4_inode *raw_inode; 466617ba13bSMingming Cao struct ext4_iloc iloc; 467ac27a0ecSDave Kleikamp void *end; 468ac27a0ecSDave Kleikamp int error; 469ac27a0ecSDave Kleikamp 47019f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 471ac27a0ecSDave Kleikamp return 0; 472617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 473ac27a0ecSDave Kleikamp if (error) 474ac27a0ecSDave Kleikamp return error; 475617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 476ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 477617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 478a0626e75SDarrick J. Wong error = ext4_xattr_check_names(IFIRST(header), end, IFIRST(header)); 479ac27a0ecSDave Kleikamp if (error) 480ac27a0ecSDave Kleikamp goto cleanup; 481431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 482ac27a0ecSDave Kleikamp buffer, buffer_size); 483ac27a0ecSDave Kleikamp 484ac27a0ecSDave Kleikamp cleanup: 485ac27a0ecSDave Kleikamp brelse(iloc.bh); 486ac27a0ecSDave Kleikamp return error; 487ac27a0ecSDave Kleikamp } 488ac27a0ecSDave Kleikamp 489ac27a0ecSDave Kleikamp /* 490617ba13bSMingming Cao * ext4_xattr_list() 491ac27a0ecSDave Kleikamp * 492ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 493ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 494ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 495ac27a0ecSDave Kleikamp * 496ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 497ac27a0ecSDave Kleikamp * used / required on success. 498ac27a0ecSDave Kleikamp */ 499d3a95d47SMingming Cao static int 500431547b3SChristoph Hellwig ext4_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size) 501ac27a0ecSDave Kleikamp { 502eaeef867STheodore Ts'o int ret, ret2; 503ac27a0ecSDave Kleikamp 5042b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 505eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 506eaeef867STheodore Ts'o if (ret < 0) 507eaeef867STheodore Ts'o goto errout; 508ac27a0ecSDave Kleikamp if (buffer) { 509eaeef867STheodore Ts'o buffer += ret; 510eaeef867STheodore Ts'o buffer_size -= ret; 511ac27a0ecSDave Kleikamp } 512eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 513eaeef867STheodore Ts'o if (ret < 0) 514eaeef867STheodore Ts'o goto errout; 515eaeef867STheodore Ts'o ret += ret2; 516eaeef867STheodore Ts'o errout: 5172b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 518eaeef867STheodore Ts'o return ret; 519ac27a0ecSDave Kleikamp } 520ac27a0ecSDave Kleikamp 521ac27a0ecSDave Kleikamp /* 522617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 523ac27a0ecSDave Kleikamp * not set, set it. 524ac27a0ecSDave Kleikamp */ 525617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 526ac27a0ecSDave Kleikamp struct super_block *sb) 527ac27a0ecSDave Kleikamp { 528617ba13bSMingming Cao if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_EXT_ATTR)) 529ac27a0ecSDave Kleikamp return; 530ac27a0ecSDave Kleikamp 5315d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 532617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 533ed2908f3SAndreas Gruenbacher EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_EXT_ATTR); 534a0375156STheodore Ts'o ext4_handle_dirty_super(handle, sb); 535ac27a0ecSDave Kleikamp } 536ac27a0ecSDave Kleikamp } 537ac27a0ecSDave Kleikamp 538ac27a0ecSDave Kleikamp /* 539ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 540ec4cb1aaSJan Kara * otherwise free the block. 541ac27a0ecSDave Kleikamp */ 542ac27a0ecSDave Kleikamp static void 543617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 544ac27a0ecSDave Kleikamp struct buffer_head *bh) 545ac27a0ecSDave Kleikamp { 546ac27a0ecSDave Kleikamp struct mb_cache_entry *ce = NULL; 5478a2bfdcbSMingming Cao int error = 0; 5489c191f70ST Makphaibulchoke struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 549ac27a0ecSDave Kleikamp 5509c191f70ST Makphaibulchoke ce = mb_cache_entry_get(ext4_mb_cache, bh->b_bdev, bh->b_blocknr); 5515d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 5528a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 5538a2bfdcbSMingming Cao if (error) 5548a2bfdcbSMingming Cao goto out; 5558a2bfdcbSMingming Cao 5568a2bfdcbSMingming Cao lock_buffer(bh); 557ac27a0ecSDave Kleikamp if (BHDR(bh)->h_refcount == cpu_to_le32(1)) { 558ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 559ac27a0ecSDave Kleikamp if (ce) 560ac27a0ecSDave Kleikamp mb_cache_entry_free(ce); 561ac27a0ecSDave Kleikamp get_bh(bh); 562ec4cb1aaSJan Kara unlock_buffer(bh); 563e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 564e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 565e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 566ac27a0ecSDave Kleikamp } else { 567e8546d06SMarcin Slusarz le32_add_cpu(&BHDR(bh)->h_refcount, -1); 568c1bb05a6SEric Sandeen if (ce) 569c1bb05a6SEric Sandeen mb_cache_entry_release(ce); 570ec4cb1aaSJan Kara /* 571ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 572ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 573ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 574ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 575ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 576ec4cb1aaSJan Kara * call ext4_handle_dirty_xattr_block() with locked buffer as 577ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 578ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 579ec4cb1aaSJan Kara */ 580ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 581ec4cb1aaSJan Kara error = ext4_handle_dirty_xattr_block(handle, inode, 582ec4cb1aaSJan Kara bh); 583c1bb05a6SEric Sandeen unlock_buffer(bh); 584ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 585ec4cb1aaSJan Kara error = ext4_handle_dirty_xattr_block(handle, inode, 586ec4cb1aaSJan Kara bh); 587ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 5880390131bSFrank Mayhar ext4_handle_sync(handle); 5891231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 590ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 591ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 592ac27a0ecSDave Kleikamp } 5938a2bfdcbSMingming Cao out: 5948a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 5958a2bfdcbSMingming Cao return; 596ac27a0ecSDave Kleikamp } 597ac27a0ecSDave Kleikamp 5986dd4ee7cSKalpak Shah /* 5996dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 6006dd4ee7cSKalpak Shah * bytes used by EA entries. 6016dd4ee7cSKalpak Shah */ 6026dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 6036dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 6046dd4ee7cSKalpak Shah { 6056dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 6066dd4ee7cSKalpak Shah if (!last->e_value_block && last->e_value_size) { 6076dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 6086dd4ee7cSKalpak Shah if (offs < *min_offs) 6096dd4ee7cSKalpak Shah *min_offs = offs; 6106dd4ee7cSKalpak Shah } 6117b1b2c1bSTheodore Ts'o if (total) 6127b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 6136dd4ee7cSKalpak Shah } 6146dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 6156dd4ee7cSKalpak Shah } 6166dd4ee7cSKalpak Shah 617ac27a0ecSDave Kleikamp static int 618617ba13bSMingming Cao ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s) 619ac27a0ecSDave Kleikamp { 620617ba13bSMingming Cao struct ext4_xattr_entry *last; 621ac27a0ecSDave Kleikamp size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); 622ac27a0ecSDave Kleikamp 623ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 624ac27a0ecSDave Kleikamp last = s->first; 625617ba13bSMingming Cao for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 626ac27a0ecSDave Kleikamp if (!last->e_value_block && last->e_value_size) { 627ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 628ac27a0ecSDave Kleikamp if (offs < min_offs) 629ac27a0ecSDave Kleikamp min_offs = offs; 630ac27a0ecSDave Kleikamp } 631ac27a0ecSDave Kleikamp } 632ac27a0ecSDave Kleikamp free = min_offs - ((void *)last - s->base) - sizeof(__u32); 633ac27a0ecSDave Kleikamp if (!s->not_found) { 634ac27a0ecSDave Kleikamp if (!s->here->e_value_block && s->here->e_value_size) { 635ac27a0ecSDave Kleikamp size_t size = le32_to_cpu(s->here->e_value_size); 636617ba13bSMingming Cao free += EXT4_XATTR_SIZE(size); 637ac27a0ecSDave Kleikamp } 638617ba13bSMingming Cao free += EXT4_XATTR_LEN(name_len); 639ac27a0ecSDave Kleikamp } 640ac27a0ecSDave Kleikamp if (i->value) { 6415f80f62aSWei Yuan if (free < EXT4_XATTR_LEN(name_len) + 642617ba13bSMingming Cao EXT4_XATTR_SIZE(i->value_len)) 643ac27a0ecSDave Kleikamp return -ENOSPC; 644ac27a0ecSDave Kleikamp } 645ac27a0ecSDave Kleikamp 646ac27a0ecSDave Kleikamp if (i->value && s->not_found) { 647ac27a0ecSDave Kleikamp /* Insert the new name. */ 648617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 649ac27a0ecSDave Kleikamp size_t rest = (void *)last - (void *)s->here + sizeof(__u32); 650ac27a0ecSDave Kleikamp memmove((void *)s->here + size, s->here, rest); 651ac27a0ecSDave Kleikamp memset(s->here, 0, size); 652ac27a0ecSDave Kleikamp s->here->e_name_index = i->name_index; 653ac27a0ecSDave Kleikamp s->here->e_name_len = name_len; 654ac27a0ecSDave Kleikamp memcpy(s->here->e_name, i->name, name_len); 655ac27a0ecSDave Kleikamp } else { 656ac27a0ecSDave Kleikamp if (!s->here->e_value_block && s->here->e_value_size) { 657ac27a0ecSDave Kleikamp void *first_val = s->base + min_offs; 658ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(s->here->e_value_offs); 659ac27a0ecSDave Kleikamp void *val = s->base + offs; 660617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE( 661ac27a0ecSDave Kleikamp le32_to_cpu(s->here->e_value_size)); 662ac27a0ecSDave Kleikamp 663617ba13bSMingming Cao if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { 664ac27a0ecSDave Kleikamp /* The old and the new value have the same 665ac27a0ecSDave Kleikamp size. Just replace. */ 666ac27a0ecSDave Kleikamp s->here->e_value_size = 667ac27a0ecSDave Kleikamp cpu_to_le32(i->value_len); 668bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 669bd9926e8STheodore Ts'o memset(val, 0, size); 670bd9926e8STheodore Ts'o } else { 671bd9926e8STheodore Ts'o /* Clear pad bytes first. */ 672617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 673bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 674ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 675bd9926e8STheodore Ts'o } 676ac27a0ecSDave Kleikamp return 0; 677ac27a0ecSDave Kleikamp } 678ac27a0ecSDave Kleikamp 679ac27a0ecSDave Kleikamp /* Remove the old value. */ 680ac27a0ecSDave Kleikamp memmove(first_val + size, first_val, val - first_val); 681ac27a0ecSDave Kleikamp memset(first_val, 0, size); 682ac27a0ecSDave Kleikamp s->here->e_value_size = 0; 683ac27a0ecSDave Kleikamp s->here->e_value_offs = 0; 684ac27a0ecSDave Kleikamp min_offs += size; 685ac27a0ecSDave Kleikamp 686ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 687ac27a0ecSDave Kleikamp last = s->first; 688ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 689ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 690ac27a0ecSDave Kleikamp if (!last->e_value_block && 691ac27a0ecSDave Kleikamp last->e_value_size && o < offs) 692ac27a0ecSDave Kleikamp last->e_value_offs = 693ac27a0ecSDave Kleikamp cpu_to_le16(o + size); 694617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 695ac27a0ecSDave Kleikamp } 696ac27a0ecSDave Kleikamp } 697ac27a0ecSDave Kleikamp if (!i->value) { 698ac27a0ecSDave Kleikamp /* Remove the old name. */ 699617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 700ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 701ac27a0ecSDave Kleikamp memmove(s->here, (void *)s->here + size, 702ac27a0ecSDave Kleikamp (void *)last - (void *)s->here + sizeof(__u32)); 703ac27a0ecSDave Kleikamp memset(last, 0, size); 704ac27a0ecSDave Kleikamp } 705ac27a0ecSDave Kleikamp } 706ac27a0ecSDave Kleikamp 707ac27a0ecSDave Kleikamp if (i->value) { 708ac27a0ecSDave Kleikamp /* Insert the new value. */ 709ac27a0ecSDave Kleikamp s->here->e_value_size = cpu_to_le32(i->value_len); 710ac27a0ecSDave Kleikamp if (i->value_len) { 711617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE(i->value_len); 712ac27a0ecSDave Kleikamp void *val = s->base + min_offs - size; 713ac27a0ecSDave Kleikamp s->here->e_value_offs = cpu_to_le16(min_offs - size); 714bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 715bd9926e8STheodore Ts'o memset(val, 0, size); 716bd9926e8STheodore Ts'o } else { 717bd9926e8STheodore Ts'o /* Clear the pad bytes first. */ 718617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 719bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 720ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 721ac27a0ecSDave Kleikamp } 722ac27a0ecSDave Kleikamp } 723bd9926e8STheodore Ts'o } 724ac27a0ecSDave Kleikamp return 0; 725ac27a0ecSDave Kleikamp } 726ac27a0ecSDave Kleikamp 727617ba13bSMingming Cao struct ext4_xattr_block_find { 728617ba13bSMingming Cao struct ext4_xattr_search s; 729ac27a0ecSDave Kleikamp struct buffer_head *bh; 730ac27a0ecSDave Kleikamp }; 731ac27a0ecSDave Kleikamp 732ac27a0ecSDave Kleikamp static int 733617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 734617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 735ac27a0ecSDave Kleikamp { 736ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 737ac27a0ecSDave Kleikamp int error; 738ac27a0ecSDave Kleikamp 739ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 740ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 741ac27a0ecSDave Kleikamp 742617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 743ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 744617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 745ac27a0ecSDave Kleikamp error = -EIO; 746ac27a0ecSDave Kleikamp if (!bs->bh) 747ac27a0ecSDave Kleikamp goto cleanup; 748ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 749ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 750ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 751cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bs->bh)) { 75224676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 75324676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 754*6a797d27SDarrick J. Wong error = -EFSCORRUPTED; 755ac27a0ecSDave Kleikamp goto cleanup; 756ac27a0ecSDave Kleikamp } 757ac27a0ecSDave Kleikamp /* Find the named attribute. */ 758ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 759ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 760ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 761ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 762617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 763ac27a0ecSDave Kleikamp i->name, bs->bh->b_size, 1); 764ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 765ac27a0ecSDave Kleikamp goto cleanup; 766ac27a0ecSDave Kleikamp bs->s.not_found = error; 767ac27a0ecSDave Kleikamp } 768ac27a0ecSDave Kleikamp error = 0; 769ac27a0ecSDave Kleikamp 770ac27a0ecSDave Kleikamp cleanup: 771ac27a0ecSDave Kleikamp return error; 772ac27a0ecSDave Kleikamp } 773ac27a0ecSDave Kleikamp 774ac27a0ecSDave Kleikamp static int 775617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 776617ba13bSMingming Cao struct ext4_xattr_info *i, 777617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 778ac27a0ecSDave Kleikamp { 779ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 780ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 781617ba13bSMingming Cao struct ext4_xattr_search *s = &bs->s; 782ac27a0ecSDave Kleikamp struct mb_cache_entry *ce = NULL; 7838a2bfdcbSMingming Cao int error = 0; 7849c191f70ST Makphaibulchoke struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 785ac27a0ecSDave Kleikamp 786617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 787ac27a0ecSDave Kleikamp 788ac27a0ecSDave Kleikamp if (i->value && i->value_len > sb->s_blocksize) 789ac27a0ecSDave Kleikamp return -ENOSPC; 790ac27a0ecSDave Kleikamp if (s->base) { 7919c191f70ST Makphaibulchoke ce = mb_cache_entry_get(ext4_mb_cache, bs->bh->b_bdev, 792ac27a0ecSDave Kleikamp bs->bh->b_blocknr); 7935d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 7948a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 7958a2bfdcbSMingming Cao if (error) 7968a2bfdcbSMingming Cao goto cleanup; 7978a2bfdcbSMingming Cao lock_buffer(bs->bh); 7988a2bfdcbSMingming Cao 799ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 800ac27a0ecSDave Kleikamp if (ce) { 801ac27a0ecSDave Kleikamp mb_cache_entry_free(ce); 802ac27a0ecSDave Kleikamp ce = NULL; 803ac27a0ecSDave Kleikamp } 804ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 805617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 806ac27a0ecSDave Kleikamp if (!error) { 807ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 808617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), 809ac27a0ecSDave Kleikamp s->here); 8109c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, 8119c191f70ST Makphaibulchoke bs->bh); 812ac27a0ecSDave Kleikamp } 813ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 814*6a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 815ac27a0ecSDave Kleikamp goto bad_block; 816ac27a0ecSDave Kleikamp if (!error) 817cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 8180390131bSFrank Mayhar inode, 819ac27a0ecSDave Kleikamp bs->bh); 820ac27a0ecSDave Kleikamp if (error) 821ac27a0ecSDave Kleikamp goto cleanup; 822ac27a0ecSDave Kleikamp goto inserted; 823ac27a0ecSDave Kleikamp } else { 824ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 825ac27a0ecSDave Kleikamp 8268a2bfdcbSMingming Cao unlock_buffer(bs->bh); 827ac27a0ecSDave Kleikamp if (ce) { 828ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 829ac27a0ecSDave Kleikamp ce = NULL; 830ac27a0ecSDave Kleikamp } 831ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 832216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 833ac27a0ecSDave Kleikamp error = -ENOMEM; 834ac27a0ecSDave Kleikamp if (s->base == NULL) 835ac27a0ecSDave Kleikamp goto cleanup; 836ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 837ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 838ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 839ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 840ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 841ac27a0ecSDave Kleikamp } 842ac27a0ecSDave Kleikamp } else { 843ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 844216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 845ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 846ac27a0ecSDave Kleikamp error = -ENOMEM; 847ac27a0ecSDave Kleikamp if (s->base == NULL) 848ac27a0ecSDave Kleikamp goto cleanup; 849617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 850ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 851ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 852ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 853ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 854ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 855ac27a0ecSDave Kleikamp } 856ac27a0ecSDave Kleikamp 857617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 858*6a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 859ac27a0ecSDave Kleikamp goto bad_block; 860ac27a0ecSDave Kleikamp if (error) 861ac27a0ecSDave Kleikamp goto cleanup; 862ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 863617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), s->here); 864ac27a0ecSDave Kleikamp 865ac27a0ecSDave Kleikamp inserted: 866ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 867617ba13bSMingming Cao new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); 868ac27a0ecSDave Kleikamp if (new_bh) { 869ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 870ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 871ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 872ac27a0ecSDave Kleikamp else { 873ac27a0ecSDave Kleikamp /* The old block is released after updating 874ac27a0ecSDave Kleikamp the inode. */ 8751231b3a1SLukas Czerner error = dquot_alloc_block(inode, 8761231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 8775dd4056dSChristoph Hellwig if (error) 878ac27a0ecSDave Kleikamp goto cleanup; 8795d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 880617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 881ac27a0ecSDave Kleikamp new_bh); 882ac27a0ecSDave Kleikamp if (error) 883ac27a0ecSDave Kleikamp goto cleanup_dquot; 884ac27a0ecSDave Kleikamp lock_buffer(new_bh); 885e8546d06SMarcin Slusarz le32_add_cpu(&BHDR(new_bh)->h_refcount, 1); 886ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 887ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(new_bh)->h_refcount)); 888ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 889cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 8900390131bSFrank Mayhar inode, 891ac27a0ecSDave Kleikamp new_bh); 892ac27a0ecSDave Kleikamp if (error) 893ac27a0ecSDave Kleikamp goto cleanup_dquot; 894ac27a0ecSDave Kleikamp } 895ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 896ac27a0ecSDave Kleikamp ce = NULL; 897ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 898ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 899ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 900ac27a0ecSDave Kleikamp new_bh = bs->bh; 901ac27a0ecSDave Kleikamp get_bh(new_bh); 902ac27a0ecSDave Kleikamp } else { 903ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 904fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 905fb0a387dSEric Sandeen 906fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 907d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 908fb0a387dSEric Sandeen 909fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 91012e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 911fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 912fb0a387dSEric Sandeen 91355f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 91455f020dbSAllison Henderson NULL, &error); 915ac27a0ecSDave Kleikamp if (error) 916ac27a0ecSDave Kleikamp goto cleanup; 917fb0a387dSEric Sandeen 91812e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 919fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 920fb0a387dSEric Sandeen 921ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 922ace36ad4SJoe Perches (unsigned long long)block); 923ac27a0ecSDave Kleikamp 924ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 925aebf0243SWang Shilong if (unlikely(!new_bh)) { 926860d21e2STheodore Ts'o error = -ENOMEM; 927ac27a0ecSDave Kleikamp getblk_failed: 9287dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 929e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 930ac27a0ecSDave Kleikamp goto cleanup; 931ac27a0ecSDave Kleikamp } 932ac27a0ecSDave Kleikamp lock_buffer(new_bh); 933617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 934ac27a0ecSDave Kleikamp if (error) { 935ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 936860d21e2STheodore Ts'o error = -EIO; 937ac27a0ecSDave Kleikamp goto getblk_failed; 938ac27a0ecSDave Kleikamp } 939ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 940ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 941ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 9429c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, new_bh); 943cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 9440390131bSFrank Mayhar inode, new_bh); 945ac27a0ecSDave Kleikamp if (error) 946ac27a0ecSDave Kleikamp goto cleanup; 947ac27a0ecSDave Kleikamp } 948ac27a0ecSDave Kleikamp } 949ac27a0ecSDave Kleikamp 950ac27a0ecSDave Kleikamp /* Update the inode. */ 951617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 952ac27a0ecSDave Kleikamp 953ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 954ac27a0ecSDave Kleikamp if (bs->bh && bs->bh != new_bh) 955617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bs->bh); 956ac27a0ecSDave Kleikamp error = 0; 957ac27a0ecSDave Kleikamp 958ac27a0ecSDave Kleikamp cleanup: 959ac27a0ecSDave Kleikamp if (ce) 960ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 961ac27a0ecSDave Kleikamp brelse(new_bh); 962ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 963ac27a0ecSDave Kleikamp kfree(s->base); 964ac27a0ecSDave Kleikamp 965ac27a0ecSDave Kleikamp return error; 966ac27a0ecSDave Kleikamp 967ac27a0ecSDave Kleikamp cleanup_dquot: 9681231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 969ac27a0ecSDave Kleikamp goto cleanup; 970ac27a0ecSDave Kleikamp 971ac27a0ecSDave Kleikamp bad_block: 97224676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 97324676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 974ac27a0ecSDave Kleikamp goto cleanup; 975ac27a0ecSDave Kleikamp 976ac27a0ecSDave Kleikamp #undef header 977ac27a0ecSDave Kleikamp } 978ac27a0ecSDave Kleikamp 979879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 980617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 981ac27a0ecSDave Kleikamp { 982617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 983617ba13bSMingming Cao struct ext4_inode *raw_inode; 984ac27a0ecSDave Kleikamp int error; 985ac27a0ecSDave Kleikamp 986617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 987ac27a0ecSDave Kleikamp return 0; 988617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 989ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 990ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 991ac27a0ecSDave Kleikamp is->s.here = is->s.first; 992617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 99319f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 994a0626e75SDarrick J. Wong error = ext4_xattr_check_names(IFIRST(header), is->s.end, 995a0626e75SDarrick J. Wong IFIRST(header)); 996ac27a0ecSDave Kleikamp if (error) 997ac27a0ecSDave Kleikamp return error; 998ac27a0ecSDave Kleikamp /* Find the named attribute. */ 999617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 1000ac27a0ecSDave Kleikamp i->name, is->s.end - 1001ac27a0ecSDave Kleikamp (void *)is->s.base, 0); 1002ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1003ac27a0ecSDave Kleikamp return error; 1004ac27a0ecSDave Kleikamp is->s.not_found = error; 1005ac27a0ecSDave Kleikamp } 1006ac27a0ecSDave Kleikamp return 0; 1007ac27a0ecSDave Kleikamp } 1008ac27a0ecSDave Kleikamp 10090d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 10100d812f77STao Ma struct ext4_xattr_info *i, 10110d812f77STao Ma struct ext4_xattr_ibody_find *is) 10120d812f77STao Ma { 10130d812f77STao Ma struct ext4_xattr_ibody_header *header; 10140d812f77STao Ma struct ext4_xattr_search *s = &is->s; 10150d812f77STao Ma int error; 10160d812f77STao Ma 10170d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 10180d812f77STao Ma return -ENOSPC; 10190d812f77STao Ma error = ext4_xattr_set_entry(i, s); 10200d812f77STao Ma if (error) { 10210d812f77STao Ma if (error == -ENOSPC && 10220d812f77STao Ma ext4_has_inline_data(inode)) { 10230d812f77STao Ma error = ext4_try_to_evict_inline_data(handle, inode, 10240d812f77STao Ma EXT4_XATTR_LEN(strlen(i->name) + 10250d812f77STao Ma EXT4_XATTR_SIZE(i->value_len))); 10260d812f77STao Ma if (error) 10270d812f77STao Ma return error; 10280d812f77STao Ma error = ext4_xattr_ibody_find(inode, i, is); 10290d812f77STao Ma if (error) 10300d812f77STao Ma return error; 10310d812f77STao Ma error = ext4_xattr_set_entry(i, s); 10320d812f77STao Ma } 10330d812f77STao Ma if (error) 10340d812f77STao Ma return error; 10350d812f77STao Ma } 10360d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 10370d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 10380d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 10390d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 10400d812f77STao Ma } else { 10410d812f77STao Ma header->h_magic = cpu_to_le32(0); 10420d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 10430d812f77STao Ma } 10440d812f77STao Ma return 0; 10450d812f77STao Ma } 10460d812f77STao Ma 10470d812f77STao Ma static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 1048617ba13bSMingming Cao struct ext4_xattr_info *i, 1049617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 1050ac27a0ecSDave Kleikamp { 1051617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 1052617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 1053ac27a0ecSDave Kleikamp int error; 1054ac27a0ecSDave Kleikamp 1055617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 1056ac27a0ecSDave Kleikamp return -ENOSPC; 1057617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 1058ac27a0ecSDave Kleikamp if (error) 1059ac27a0ecSDave Kleikamp return error; 1060617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 1061ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 1062617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 106319f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 1064ac27a0ecSDave Kleikamp } else { 1065ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 106619f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 1067ac27a0ecSDave Kleikamp } 1068ac27a0ecSDave Kleikamp return 0; 1069ac27a0ecSDave Kleikamp } 1070ac27a0ecSDave Kleikamp 1071ac27a0ecSDave Kleikamp /* 1072617ba13bSMingming Cao * ext4_xattr_set_handle() 1073ac27a0ecSDave Kleikamp * 10746e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 1075ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 1076ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 1077ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 1078ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 1079ac27a0ecSDave Kleikamp * previous to the call, respectively. 1080ac27a0ecSDave Kleikamp * 1081ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1082ac27a0ecSDave Kleikamp */ 1083ac27a0ecSDave Kleikamp int 1084617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 1085ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 1086ac27a0ecSDave Kleikamp int flags) 1087ac27a0ecSDave Kleikamp { 1088617ba13bSMingming Cao struct ext4_xattr_info i = { 1089ac27a0ecSDave Kleikamp .name_index = name_index, 1090ac27a0ecSDave Kleikamp .name = name, 1091ac27a0ecSDave Kleikamp .value = value, 1092ac27a0ecSDave Kleikamp .value_len = value_len, 1093ac27a0ecSDave Kleikamp 1094ac27a0ecSDave Kleikamp }; 1095617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 1096ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1097ac27a0ecSDave Kleikamp }; 1098617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 1099ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1100ac27a0ecSDave Kleikamp }; 11014d20c685SKalpak Shah unsigned long no_expand; 1102ac27a0ecSDave Kleikamp int error; 1103ac27a0ecSDave Kleikamp 1104ac27a0ecSDave Kleikamp if (!name) 1105ac27a0ecSDave Kleikamp return -EINVAL; 1106ac27a0ecSDave Kleikamp if (strlen(name) > 255) 1107ac27a0ecSDave Kleikamp return -ERANGE; 1108617ba13bSMingming Cao down_write(&EXT4_I(inode)->xattr_sem); 110919f5fb7aSTheodore Ts'o no_expand = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND); 111019f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND); 11114d20c685SKalpak Shah 111266543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 111386ebfd08SEric Sandeen if (error) 111486ebfd08SEric Sandeen goto cleanup; 111586ebfd08SEric Sandeen 111619f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 1117617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 1118617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 111919f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 1120ac27a0ecSDave Kleikamp } 1121ac27a0ecSDave Kleikamp 1122617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 1123ac27a0ecSDave Kleikamp if (error) 1124ac27a0ecSDave Kleikamp goto cleanup; 1125ac27a0ecSDave Kleikamp if (is.s.not_found) 1126617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 1127ac27a0ecSDave Kleikamp if (error) 1128ac27a0ecSDave Kleikamp goto cleanup; 1129ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 1130ac27a0ecSDave Kleikamp error = -ENODATA; 1131ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 1132ac27a0ecSDave Kleikamp goto cleanup; 1133ac27a0ecSDave Kleikamp error = 0; 1134ac27a0ecSDave Kleikamp if (!value) 1135ac27a0ecSDave Kleikamp goto cleanup; 1136ac27a0ecSDave Kleikamp } else { 1137ac27a0ecSDave Kleikamp error = -EEXIST; 1138ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 1139ac27a0ecSDave Kleikamp goto cleanup; 1140ac27a0ecSDave Kleikamp } 1141ac27a0ecSDave Kleikamp if (!value) { 1142ac27a0ecSDave Kleikamp if (!is.s.not_found) 1143617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1144ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 1145617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1146ac27a0ecSDave Kleikamp } else { 1147617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1148ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 1149ac27a0ecSDave Kleikamp i.value = NULL; 1150617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1151ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 11527e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 11537e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 11547e01c8e5STiger Yang if (error) 11557e01c8e5STiger Yang goto cleanup; 11567e01c8e5STiger Yang } 1157617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1158ac27a0ecSDave Kleikamp if (error) 1159ac27a0ecSDave Kleikamp goto cleanup; 1160ac27a0ecSDave Kleikamp if (!is.s.not_found) { 1161ac27a0ecSDave Kleikamp i.value = NULL; 1162617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, 1163ac27a0ecSDave Kleikamp &is); 1164ac27a0ecSDave Kleikamp } 1165ac27a0ecSDave Kleikamp } 1166ac27a0ecSDave Kleikamp } 1167ac27a0ecSDave Kleikamp if (!error) { 1168617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 1169ef7f3835SKalpak Shah inode->i_ctime = ext4_current_time(inode); 11706dd4ee7cSKalpak Shah if (!value) 117119f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); 1172617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 1173ac27a0ecSDave Kleikamp /* 1174617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 1175ac27a0ecSDave Kleikamp * error != 0. 1176ac27a0ecSDave Kleikamp */ 1177ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 1178ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 11790390131bSFrank Mayhar ext4_handle_sync(handle); 1180ac27a0ecSDave Kleikamp } 1181ac27a0ecSDave Kleikamp 1182ac27a0ecSDave Kleikamp cleanup: 1183ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 1184ac27a0ecSDave Kleikamp brelse(bs.bh); 11854d20c685SKalpak Shah if (no_expand == 0) 118619f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); 1187617ba13bSMingming Cao up_write(&EXT4_I(inode)->xattr_sem); 1188ac27a0ecSDave Kleikamp return error; 1189ac27a0ecSDave Kleikamp } 1190ac27a0ecSDave Kleikamp 1191ac27a0ecSDave Kleikamp /* 1192617ba13bSMingming Cao * ext4_xattr_set() 1193ac27a0ecSDave Kleikamp * 1194617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 1195ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 1196ac27a0ecSDave Kleikamp * 1197ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1198ac27a0ecSDave Kleikamp */ 1199ac27a0ecSDave Kleikamp int 1200617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 1201ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 1202ac27a0ecSDave Kleikamp { 1203ac27a0ecSDave Kleikamp handle_t *handle; 1204ac27a0ecSDave Kleikamp int error, retries = 0; 120595eaefbdSTheodore Ts'o int credits = ext4_jbd2_credits_xattr(inode); 1206ac27a0ecSDave Kleikamp 1207ac27a0ecSDave Kleikamp retry: 12089924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 1209ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 1210ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 1211ac27a0ecSDave Kleikamp } else { 1212ac27a0ecSDave Kleikamp int error2; 1213ac27a0ecSDave Kleikamp 1214617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 1215ac27a0ecSDave Kleikamp value, value_len, flags); 1216617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 1217ac27a0ecSDave Kleikamp if (error == -ENOSPC && 1218617ba13bSMingming Cao ext4_should_retry_alloc(inode->i_sb, &retries)) 1219ac27a0ecSDave Kleikamp goto retry; 1220ac27a0ecSDave Kleikamp if (error == 0) 1221ac27a0ecSDave Kleikamp error = error2; 1222ac27a0ecSDave Kleikamp } 1223ac27a0ecSDave Kleikamp 1224ac27a0ecSDave Kleikamp return error; 1225ac27a0ecSDave Kleikamp } 1226ac27a0ecSDave Kleikamp 1227ac27a0ecSDave Kleikamp /* 12286dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 12296dd4ee7cSKalpak Shah * i_extra_isize. 12306dd4ee7cSKalpak Shah */ 12316dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 12326dd4ee7cSKalpak Shah int value_offs_shift, void *to, 12336dd4ee7cSKalpak Shah void *from, size_t n, int blocksize) 12346dd4ee7cSKalpak Shah { 12356dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 12366dd4ee7cSKalpak Shah int new_offs; 12376dd4ee7cSKalpak Shah 12386dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 12396dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 12406dd4ee7cSKalpak Shah if (!last->e_value_block && last->e_value_size) { 12416dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 12426dd4ee7cSKalpak Shah value_offs_shift; 12436dd4ee7cSKalpak Shah BUG_ON(new_offs + le32_to_cpu(last->e_value_size) 12446dd4ee7cSKalpak Shah > blocksize); 12456dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 12466dd4ee7cSKalpak Shah } 12476dd4ee7cSKalpak Shah } 12486dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 12496dd4ee7cSKalpak Shah memmove(to, from, n); 12506dd4ee7cSKalpak Shah } 12516dd4ee7cSKalpak Shah 12526dd4ee7cSKalpak Shah /* 12536dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 12546dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 12556dd4ee7cSKalpak Shah */ 12566dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 12576dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 12586dd4ee7cSKalpak Shah { 12596dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 12606dd4ee7cSKalpak Shah struct ext4_xattr_entry *entry, *last, *first; 12616dd4ee7cSKalpak Shah struct buffer_head *bh = NULL; 12626dd4ee7cSKalpak Shah struct ext4_xattr_ibody_find *is = NULL; 12636dd4ee7cSKalpak Shah struct ext4_xattr_block_find *bs = NULL; 12646dd4ee7cSKalpak Shah char *buffer = NULL, *b_entry_name = NULL; 12656dd4ee7cSKalpak Shah size_t min_offs, free; 12667b1b2c1bSTheodore Ts'o int total_ino; 12676dd4ee7cSKalpak Shah void *base, *start, *end; 12686dd4ee7cSKalpak Shah int extra_isize = 0, error = 0, tried_min_extra_isize = 0; 1269ac39849dSAneesh Kumar K.V int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); 12706dd4ee7cSKalpak Shah 12716dd4ee7cSKalpak Shah down_write(&EXT4_I(inode)->xattr_sem); 12726dd4ee7cSKalpak Shah retry: 12736dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) { 12746dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 12756dd4ee7cSKalpak Shah return 0; 12766dd4ee7cSKalpak Shah } 12776dd4ee7cSKalpak Shah 12786dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 12796dd4ee7cSKalpak Shah entry = IFIRST(header); 12806dd4ee7cSKalpak Shah 12816dd4ee7cSKalpak Shah /* 12826dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 12836dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 12846dd4ee7cSKalpak Shah */ 12856dd4ee7cSKalpak Shah 12866dd4ee7cSKalpak Shah base = start = entry; 12876dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 12886dd4ee7cSKalpak Shah min_offs = end - base; 12896dd4ee7cSKalpak Shah last = entry; 12906dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 12916dd4ee7cSKalpak Shah 12926dd4ee7cSKalpak Shah free = ext4_xattr_free_space(last, &min_offs, base, &total_ino); 12936dd4ee7cSKalpak Shah if (free >= new_extra_isize) { 12946dd4ee7cSKalpak Shah entry = IFIRST(header); 12956dd4ee7cSKalpak Shah ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize 12966dd4ee7cSKalpak Shah - new_extra_isize, (void *)raw_inode + 12976dd4ee7cSKalpak Shah EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 12986dd4ee7cSKalpak Shah (void *)header, total_ino, 12996dd4ee7cSKalpak Shah inode->i_sb->s_blocksize); 13006dd4ee7cSKalpak Shah EXT4_I(inode)->i_extra_isize = new_extra_isize; 13016dd4ee7cSKalpak Shah error = 0; 13026dd4ee7cSKalpak Shah goto cleanup; 13036dd4ee7cSKalpak Shah } 13046dd4ee7cSKalpak Shah 13056dd4ee7cSKalpak Shah /* 13066dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 13076dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 13086dd4ee7cSKalpak Shah */ 13096dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 13106dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 13116dd4ee7cSKalpak Shah error = -EIO; 13126dd4ee7cSKalpak Shah if (!bh) 13136dd4ee7cSKalpak Shah goto cleanup; 1314cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 131524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 131624676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1317*6a797d27SDarrick J. Wong error = -EFSCORRUPTED; 13186dd4ee7cSKalpak Shah goto cleanup; 13196dd4ee7cSKalpak Shah } 13206dd4ee7cSKalpak Shah base = BHDR(bh); 13216dd4ee7cSKalpak Shah first = BFIRST(bh); 13226dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 13236dd4ee7cSKalpak Shah min_offs = end - base; 13247b1b2c1bSTheodore Ts'o free = ext4_xattr_free_space(first, &min_offs, base, NULL); 13256dd4ee7cSKalpak Shah if (free < new_extra_isize) { 13266dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 13276dd4ee7cSKalpak Shah tried_min_extra_isize++; 13286dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 13296dd4ee7cSKalpak Shah brelse(bh); 13306dd4ee7cSKalpak Shah goto retry; 13316dd4ee7cSKalpak Shah } 13326dd4ee7cSKalpak Shah error = -1; 13336dd4ee7cSKalpak Shah goto cleanup; 13346dd4ee7cSKalpak Shah } 13356dd4ee7cSKalpak Shah } else { 13366dd4ee7cSKalpak Shah free = inode->i_sb->s_blocksize; 13376dd4ee7cSKalpak Shah } 13386dd4ee7cSKalpak Shah 13396dd4ee7cSKalpak Shah while (new_extra_isize > 0) { 13406dd4ee7cSKalpak Shah size_t offs, size, entry_size; 13416dd4ee7cSKalpak Shah struct ext4_xattr_entry *small_entry = NULL; 13426dd4ee7cSKalpak Shah struct ext4_xattr_info i = { 13436dd4ee7cSKalpak Shah .value = NULL, 13446dd4ee7cSKalpak Shah .value_len = 0, 13456dd4ee7cSKalpak Shah }; 13466dd4ee7cSKalpak Shah unsigned int total_size; /* EA entry size + value size */ 13476dd4ee7cSKalpak Shah unsigned int shift_bytes; /* No. of bytes to shift EAs by? */ 13486dd4ee7cSKalpak Shah unsigned int min_total_size = ~0U; 13496dd4ee7cSKalpak Shah 13506dd4ee7cSKalpak Shah is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 13516dd4ee7cSKalpak Shah bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 13526dd4ee7cSKalpak Shah if (!is || !bs) { 13536dd4ee7cSKalpak Shah error = -ENOMEM; 13546dd4ee7cSKalpak Shah goto cleanup; 13556dd4ee7cSKalpak Shah } 13566dd4ee7cSKalpak Shah 13576dd4ee7cSKalpak Shah is->s.not_found = -ENODATA; 13586dd4ee7cSKalpak Shah bs->s.not_found = -ENODATA; 13596dd4ee7cSKalpak Shah is->iloc.bh = NULL; 13606dd4ee7cSKalpak Shah bs->bh = NULL; 13616dd4ee7cSKalpak Shah 13626dd4ee7cSKalpak Shah last = IFIRST(header); 13636dd4ee7cSKalpak Shah /* Find the entry best suited to be pushed into EA block */ 13646dd4ee7cSKalpak Shah entry = NULL; 13656dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 13666dd4ee7cSKalpak Shah total_size = 13676dd4ee7cSKalpak Shah EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + 13686dd4ee7cSKalpak Shah EXT4_XATTR_LEN(last->e_name_len); 13696dd4ee7cSKalpak Shah if (total_size <= free && total_size < min_total_size) { 13706dd4ee7cSKalpak Shah if (total_size < new_extra_isize) { 13716dd4ee7cSKalpak Shah small_entry = last; 13726dd4ee7cSKalpak Shah } else { 13736dd4ee7cSKalpak Shah entry = last; 13746dd4ee7cSKalpak Shah min_total_size = total_size; 13756dd4ee7cSKalpak Shah } 13766dd4ee7cSKalpak Shah } 13776dd4ee7cSKalpak Shah } 13786dd4ee7cSKalpak Shah 13796dd4ee7cSKalpak Shah if (entry == NULL) { 13806dd4ee7cSKalpak Shah if (small_entry) { 13816dd4ee7cSKalpak Shah entry = small_entry; 13826dd4ee7cSKalpak Shah } else { 13836dd4ee7cSKalpak Shah if (!tried_min_extra_isize && 13846dd4ee7cSKalpak Shah s_min_extra_isize) { 13856dd4ee7cSKalpak Shah tried_min_extra_isize++; 13866dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 13876e4ea8e3SDave Jones kfree(is); is = NULL; 13886e4ea8e3SDave Jones kfree(bs); bs = NULL; 1389dcb9917bSTheodore Ts'o brelse(bh); 13906dd4ee7cSKalpak Shah goto retry; 13916dd4ee7cSKalpak Shah } 13926dd4ee7cSKalpak Shah error = -1; 13936dd4ee7cSKalpak Shah goto cleanup; 13946dd4ee7cSKalpak Shah } 13956dd4ee7cSKalpak Shah } 13966dd4ee7cSKalpak Shah offs = le16_to_cpu(entry->e_value_offs); 13976dd4ee7cSKalpak Shah size = le32_to_cpu(entry->e_value_size); 13986dd4ee7cSKalpak Shah entry_size = EXT4_XATTR_LEN(entry->e_name_len); 13996dd4ee7cSKalpak Shah i.name_index = entry->e_name_index, 14006dd4ee7cSKalpak Shah buffer = kmalloc(EXT4_XATTR_SIZE(size), GFP_NOFS); 14016dd4ee7cSKalpak Shah b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 14026dd4ee7cSKalpak Shah if (!buffer || !b_entry_name) { 14036dd4ee7cSKalpak Shah error = -ENOMEM; 14046dd4ee7cSKalpak Shah goto cleanup; 14056dd4ee7cSKalpak Shah } 14066dd4ee7cSKalpak Shah /* Save the entry name and the entry value */ 14076dd4ee7cSKalpak Shah memcpy(buffer, (void *)IFIRST(header) + offs, 14086dd4ee7cSKalpak Shah EXT4_XATTR_SIZE(size)); 14096dd4ee7cSKalpak Shah memcpy(b_entry_name, entry->e_name, entry->e_name_len); 14106dd4ee7cSKalpak Shah b_entry_name[entry->e_name_len] = '\0'; 14116dd4ee7cSKalpak Shah i.name = b_entry_name; 14126dd4ee7cSKalpak Shah 14136dd4ee7cSKalpak Shah error = ext4_get_inode_loc(inode, &is->iloc); 14146dd4ee7cSKalpak Shah if (error) 14156dd4ee7cSKalpak Shah goto cleanup; 14166dd4ee7cSKalpak Shah 14176dd4ee7cSKalpak Shah error = ext4_xattr_ibody_find(inode, &i, is); 14186dd4ee7cSKalpak Shah if (error) 14196dd4ee7cSKalpak Shah goto cleanup; 14206dd4ee7cSKalpak Shah 14216dd4ee7cSKalpak Shah /* Remove the chosen entry from the inode */ 14226dd4ee7cSKalpak Shah error = ext4_xattr_ibody_set(handle, inode, &i, is); 14239aaab058SRoel Kluin if (error) 14249aaab058SRoel Kluin goto cleanup; 14256dd4ee7cSKalpak Shah 14266dd4ee7cSKalpak Shah entry = IFIRST(header); 14276dd4ee7cSKalpak Shah if (entry_size + EXT4_XATTR_SIZE(size) >= new_extra_isize) 14286dd4ee7cSKalpak Shah shift_bytes = new_extra_isize; 14296dd4ee7cSKalpak Shah else 14306dd4ee7cSKalpak Shah shift_bytes = entry_size + size; 14316dd4ee7cSKalpak Shah /* Adjust the offsets and shift the remaining entries ahead */ 14326dd4ee7cSKalpak Shah ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize - 14336dd4ee7cSKalpak Shah shift_bytes, (void *)raw_inode + 14346dd4ee7cSKalpak Shah EXT4_GOOD_OLD_INODE_SIZE + extra_isize + shift_bytes, 14356dd4ee7cSKalpak Shah (void *)header, total_ino - entry_size, 14366dd4ee7cSKalpak Shah inode->i_sb->s_blocksize); 14376dd4ee7cSKalpak Shah 14386dd4ee7cSKalpak Shah extra_isize += shift_bytes; 14396dd4ee7cSKalpak Shah new_extra_isize -= shift_bytes; 14406dd4ee7cSKalpak Shah EXT4_I(inode)->i_extra_isize = extra_isize; 14416dd4ee7cSKalpak Shah 14426dd4ee7cSKalpak Shah i.name = b_entry_name; 14436dd4ee7cSKalpak Shah i.value = buffer; 1444ac39849dSAneesh Kumar K.V i.value_len = size; 14456dd4ee7cSKalpak Shah error = ext4_xattr_block_find(inode, &i, bs); 14466dd4ee7cSKalpak Shah if (error) 14476dd4ee7cSKalpak Shah goto cleanup; 14486dd4ee7cSKalpak Shah 14496dd4ee7cSKalpak Shah /* Add entry which was removed from the inode into the block */ 14506dd4ee7cSKalpak Shah error = ext4_xattr_block_set(handle, inode, &i, bs); 14516dd4ee7cSKalpak Shah if (error) 14526dd4ee7cSKalpak Shah goto cleanup; 14536dd4ee7cSKalpak Shah kfree(b_entry_name); 14546dd4ee7cSKalpak Shah kfree(buffer); 1455d3533d72SJulia Lawall b_entry_name = NULL; 1456d3533d72SJulia Lawall buffer = NULL; 14576dd4ee7cSKalpak Shah brelse(is->iloc.bh); 14586dd4ee7cSKalpak Shah kfree(is); 14596dd4ee7cSKalpak Shah kfree(bs); 14606dd4ee7cSKalpak Shah } 14616dd4ee7cSKalpak Shah brelse(bh); 14626dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 14636dd4ee7cSKalpak Shah return 0; 14646dd4ee7cSKalpak Shah 14656dd4ee7cSKalpak Shah cleanup: 14666dd4ee7cSKalpak Shah kfree(b_entry_name); 14676dd4ee7cSKalpak Shah kfree(buffer); 14686dd4ee7cSKalpak Shah if (is) 14696dd4ee7cSKalpak Shah brelse(is->iloc.bh); 14706dd4ee7cSKalpak Shah kfree(is); 14716dd4ee7cSKalpak Shah kfree(bs); 14726dd4ee7cSKalpak Shah brelse(bh); 14736dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 14746dd4ee7cSKalpak Shah return error; 14756dd4ee7cSKalpak Shah } 14766dd4ee7cSKalpak Shah 14776dd4ee7cSKalpak Shah 14786dd4ee7cSKalpak Shah 14796dd4ee7cSKalpak Shah /* 1480617ba13bSMingming Cao * ext4_xattr_delete_inode() 1481ac27a0ecSDave Kleikamp * 1482ac27a0ecSDave Kleikamp * Free extended attribute resources associated with this inode. This 1483ac27a0ecSDave Kleikamp * is called immediately before an inode is freed. We have exclusive 1484ac27a0ecSDave Kleikamp * access to the inode. 1485ac27a0ecSDave Kleikamp */ 1486ac27a0ecSDave Kleikamp void 1487617ba13bSMingming Cao ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) 1488ac27a0ecSDave Kleikamp { 1489ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 1490ac27a0ecSDave Kleikamp 1491617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 1492ac27a0ecSDave Kleikamp goto cleanup; 1493617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 1494ac27a0ecSDave Kleikamp if (!bh) { 149524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 149624676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1497ac27a0ecSDave Kleikamp goto cleanup; 1498ac27a0ecSDave Kleikamp } 1499617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 1500ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) { 150124676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 150224676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1503ac27a0ecSDave Kleikamp goto cleanup; 1504ac27a0ecSDave Kleikamp } 1505617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bh); 1506617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 1507ac27a0ecSDave Kleikamp 1508ac27a0ecSDave Kleikamp cleanup: 1509ac27a0ecSDave Kleikamp brelse(bh); 1510ac27a0ecSDave Kleikamp } 1511ac27a0ecSDave Kleikamp 1512ac27a0ecSDave Kleikamp /* 1513617ba13bSMingming Cao * ext4_xattr_put_super() 1514ac27a0ecSDave Kleikamp * 1515ac27a0ecSDave Kleikamp * This is called when a file system is unmounted. 1516ac27a0ecSDave Kleikamp */ 1517ac27a0ecSDave Kleikamp void 1518617ba13bSMingming Cao ext4_xattr_put_super(struct super_block *sb) 1519ac27a0ecSDave Kleikamp { 1520ac27a0ecSDave Kleikamp mb_cache_shrink(sb->s_bdev); 1521ac27a0ecSDave Kleikamp } 1522ac27a0ecSDave Kleikamp 1523ac27a0ecSDave Kleikamp /* 1524617ba13bSMingming Cao * ext4_xattr_cache_insert() 1525ac27a0ecSDave Kleikamp * 1526ac27a0ecSDave Kleikamp * Create a new entry in the extended attribute cache, and insert 1527ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 1528ac27a0ecSDave Kleikamp * 1529ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1530ac27a0ecSDave Kleikamp */ 1531ac27a0ecSDave Kleikamp static void 15329c191f70ST Makphaibulchoke ext4_xattr_cache_insert(struct mb_cache *ext4_mb_cache, struct buffer_head *bh) 1533ac27a0ecSDave Kleikamp { 1534ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(BHDR(bh)->h_hash); 1535ac27a0ecSDave Kleikamp struct mb_cache_entry *ce; 1536ac27a0ecSDave Kleikamp int error; 1537ac27a0ecSDave Kleikamp 15389c191f70ST Makphaibulchoke ce = mb_cache_entry_alloc(ext4_mb_cache, GFP_NOFS); 1539ac27a0ecSDave Kleikamp if (!ce) { 1540ac27a0ecSDave Kleikamp ea_bdebug(bh, "out of memory"); 1541ac27a0ecSDave Kleikamp return; 1542ac27a0ecSDave Kleikamp } 15432aec7c52SAndreas Gruenbacher error = mb_cache_entry_insert(ce, bh->b_bdev, bh->b_blocknr, hash); 1544ac27a0ecSDave Kleikamp if (error) { 1545ac27a0ecSDave Kleikamp mb_cache_entry_free(ce); 1546ac27a0ecSDave Kleikamp if (error == -EBUSY) { 1547ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 1548ac27a0ecSDave Kleikamp error = 0; 1549ac27a0ecSDave Kleikamp } 1550ac27a0ecSDave Kleikamp } else { 1551ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 1552ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 1553ac27a0ecSDave Kleikamp } 1554ac27a0ecSDave Kleikamp } 1555ac27a0ecSDave Kleikamp 1556ac27a0ecSDave Kleikamp /* 1557617ba13bSMingming Cao * ext4_xattr_cmp() 1558ac27a0ecSDave Kleikamp * 1559ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 1560ac27a0ecSDave Kleikamp * 1561ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 1562ac27a0ecSDave Kleikamp * a negative error number on errors. 1563ac27a0ecSDave Kleikamp */ 1564ac27a0ecSDave Kleikamp static int 1565617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 1566617ba13bSMingming Cao struct ext4_xattr_header *header2) 1567ac27a0ecSDave Kleikamp { 1568617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 1569ac27a0ecSDave Kleikamp 1570ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 1571ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 1572ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 1573ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 1574ac27a0ecSDave Kleikamp return 1; 1575ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 1576ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 1577ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 1578ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 1579ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 1580ac27a0ecSDave Kleikamp return 1; 1581ac27a0ecSDave Kleikamp if (entry1->e_value_block != 0 || entry2->e_value_block != 0) 1582*6a797d27SDarrick J. Wong return -EFSCORRUPTED; 1583ac27a0ecSDave Kleikamp if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 1584ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 1585ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 1586ac27a0ecSDave Kleikamp return 1; 1587ac27a0ecSDave Kleikamp 1588617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 1589617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 1590ac27a0ecSDave Kleikamp } 1591ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 1592ac27a0ecSDave Kleikamp return 1; 1593ac27a0ecSDave Kleikamp return 0; 1594ac27a0ecSDave Kleikamp } 1595ac27a0ecSDave Kleikamp 1596ac27a0ecSDave Kleikamp /* 1597617ba13bSMingming Cao * ext4_xattr_cache_find() 1598ac27a0ecSDave Kleikamp * 1599ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 1600ac27a0ecSDave Kleikamp * 1601ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 1602ac27a0ecSDave Kleikamp * not found or an error occurred. 1603ac27a0ecSDave Kleikamp */ 1604ac27a0ecSDave Kleikamp static struct buffer_head * 1605617ba13bSMingming Cao ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, 1606ac27a0ecSDave Kleikamp struct mb_cache_entry **pce) 1607ac27a0ecSDave Kleikamp { 1608ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 1609ac27a0ecSDave Kleikamp struct mb_cache_entry *ce; 16109c191f70ST Makphaibulchoke struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 1611ac27a0ecSDave Kleikamp 1612ac27a0ecSDave Kleikamp if (!header->h_hash) 1613ac27a0ecSDave Kleikamp return NULL; /* never share */ 1614ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 1615ac27a0ecSDave Kleikamp again: 16169c191f70ST Makphaibulchoke ce = mb_cache_entry_find_first(ext4_mb_cache, inode->i_sb->s_bdev, 16172aec7c52SAndreas Gruenbacher hash); 1618ac27a0ecSDave Kleikamp while (ce) { 1619ac27a0ecSDave Kleikamp struct buffer_head *bh; 1620ac27a0ecSDave Kleikamp 1621ac27a0ecSDave Kleikamp if (IS_ERR(ce)) { 1622ac27a0ecSDave Kleikamp if (PTR_ERR(ce) == -EAGAIN) 1623ac27a0ecSDave Kleikamp goto again; 1624ac27a0ecSDave Kleikamp break; 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); 16412aec7c52SAndreas Gruenbacher ce = mb_cache_entry_find_next(ce, inode->i_sb->s_bdev, hash); 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 17169c191f70ST Makphaibulchoke struct mb_cache * 17179c191f70ST Makphaibulchoke ext4_xattr_create_cache(char *name) 1718ac27a0ecSDave Kleikamp { 17199c191f70ST Makphaibulchoke return mb_cache_create(name, HASH_BUCKET_BITS); 1720ac27a0ecSDave Kleikamp } 1721ac27a0ecSDave Kleikamp 17229c191f70ST Makphaibulchoke void ext4_xattr_destroy_cache(struct mb_cache *cache) 1723ac27a0ecSDave Kleikamp { 17249c191f70ST Makphaibulchoke if (cache) 17259c191f70ST Makphaibulchoke mb_cache_destroy(cache); 1726ac27a0ecSDave Kleikamp } 17279c191f70ST Makphaibulchoke 1728