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> 58ac27a0ecSDave Kleikamp #include <linux/rwsem.h> 593dcf5451SChristoph Hellwig #include "ext4_jbd2.h" 603dcf5451SChristoph Hellwig #include "ext4.h" 61ac27a0ecSDave Kleikamp #include "xattr.h" 62ac27a0ecSDave Kleikamp #include "acl.h" 63ac27a0ecSDave Kleikamp 64617ba13bSMingming Cao #ifdef EXT4_XATTR_DEBUG 65ac27a0ecSDave Kleikamp # define ea_idebug(inode, f...) do { \ 66ac27a0ecSDave Kleikamp printk(KERN_DEBUG "inode %s:%lu: ", \ 67ac27a0ecSDave Kleikamp inode->i_sb->s_id, inode->i_ino); \ 68ac27a0ecSDave Kleikamp printk(f); \ 69ac27a0ecSDave Kleikamp printk("\n"); \ 70ac27a0ecSDave Kleikamp } while (0) 71ac27a0ecSDave Kleikamp # define ea_bdebug(bh, f...) do { \ 72ac27a0ecSDave Kleikamp char b[BDEVNAME_SIZE]; \ 73ac27a0ecSDave Kleikamp printk(KERN_DEBUG "block %s:%lu: ", \ 74ac27a0ecSDave Kleikamp bdevname(bh->b_bdev, b), \ 75ac27a0ecSDave Kleikamp (unsigned long) bh->b_blocknr); \ 76ac27a0ecSDave Kleikamp printk(f); \ 77ac27a0ecSDave Kleikamp printk("\n"); \ 78ac27a0ecSDave Kleikamp } while (0) 79ac27a0ecSDave Kleikamp #else 80ace36ad4SJoe Perches # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 81ace36ad4SJoe Perches # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 82ac27a0ecSDave Kleikamp #endif 83ac27a0ecSDave Kleikamp 849c191f70ST Makphaibulchoke static void ext4_xattr_cache_insert(struct mb_cache *, struct buffer_head *); 85617ba13bSMingming Cao static struct buffer_head *ext4_xattr_cache_find(struct inode *, 86617ba13bSMingming Cao struct ext4_xattr_header *, 87ac27a0ecSDave Kleikamp struct mb_cache_entry **); 88617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *, 89617ba13bSMingming Cao struct ext4_xattr_entry *); 90431547b3SChristoph Hellwig static int ext4_xattr_list(struct dentry *dentry, char *buffer, 91d3a95d47SMingming Cao size_t buffer_size); 92ac27a0ecSDave Kleikamp 9311e27528SStephen Hemminger static const struct xattr_handler *ext4_xattr_handler_map[] = { 94617ba13bSMingming Cao [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, 9503010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 9664e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, 9764e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, 98ac27a0ecSDave Kleikamp #endif 99617ba13bSMingming Cao [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, 10003010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 101617ba13bSMingming Cao [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, 102ac27a0ecSDave Kleikamp #endif 103ac27a0ecSDave Kleikamp }; 104ac27a0ecSDave Kleikamp 10511e27528SStephen Hemminger const struct xattr_handler *ext4_xattr_handlers[] = { 106617ba13bSMingming Cao &ext4_xattr_user_handler, 107617ba13bSMingming Cao &ext4_xattr_trusted_handler, 10803010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 10964e178a7SChristoph Hellwig &posix_acl_access_xattr_handler, 11064e178a7SChristoph Hellwig &posix_acl_default_xattr_handler, 111ac27a0ecSDave Kleikamp #endif 11203010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 113617ba13bSMingming Cao &ext4_xattr_security_handler, 114ac27a0ecSDave Kleikamp #endif 115ac27a0ecSDave Kleikamp NULL 116ac27a0ecSDave Kleikamp }; 117ac27a0ecSDave Kleikamp 1189c191f70ST Makphaibulchoke #define EXT4_GET_MB_CACHE(inode) (((struct ext4_sb_info *) \ 1199c191f70ST Makphaibulchoke inode->i_sb->s_fs_info)->s_mb_cache) 1209c191f70ST Makphaibulchoke 121cc8e94fdSDarrick J. Wong static __le32 ext4_xattr_block_csum(struct inode *inode, 122cc8e94fdSDarrick J. Wong sector_t block_nr, 123cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 124cc8e94fdSDarrick J. Wong { 125cc8e94fdSDarrick J. Wong struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 126d6a77105STheodore Ts'o __u32 csum; 127d6a77105STheodore Ts'o __le32 save_csum; 128d6a77105STheodore Ts'o __le64 dsk_block_nr = cpu_to_le64(block_nr); 129cc8e94fdSDarrick J. Wong 130d6a77105STheodore Ts'o save_csum = hdr->h_checksum; 131cc8e94fdSDarrick J. Wong hdr->h_checksum = 0; 132d6a77105STheodore Ts'o csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, 133d6a77105STheodore Ts'o sizeof(dsk_block_nr)); 134cc8e94fdSDarrick J. Wong csum = ext4_chksum(sbi, csum, (__u8 *)hdr, 135cc8e94fdSDarrick J. Wong EXT4_BLOCK_SIZE(inode->i_sb)); 13641eb70ddSTao Ma 137d6a77105STheodore Ts'o hdr->h_checksum = save_csum; 138cc8e94fdSDarrick J. Wong return cpu_to_le32(csum); 139cc8e94fdSDarrick J. Wong } 140cc8e94fdSDarrick J. Wong 141cc8e94fdSDarrick J. Wong static int ext4_xattr_block_csum_verify(struct inode *inode, 142cc8e94fdSDarrick J. Wong sector_t block_nr, 143cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 144cc8e94fdSDarrick J. Wong { 145cc8e94fdSDarrick J. Wong if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, 146cc8e94fdSDarrick J. Wong EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && 147cc8e94fdSDarrick J. Wong (hdr->h_checksum != ext4_xattr_block_csum(inode, block_nr, hdr))) 148cc8e94fdSDarrick J. Wong return 0; 149cc8e94fdSDarrick J. Wong return 1; 150cc8e94fdSDarrick J. Wong } 151cc8e94fdSDarrick J. Wong 152cc8e94fdSDarrick J. Wong static void ext4_xattr_block_csum_set(struct inode *inode, 153cc8e94fdSDarrick J. Wong sector_t block_nr, 154cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 155cc8e94fdSDarrick J. Wong { 156cc8e94fdSDarrick J. Wong if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, 157cc8e94fdSDarrick J. Wong EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) 158cc8e94fdSDarrick J. Wong return; 159cc8e94fdSDarrick J. Wong 160cc8e94fdSDarrick J. Wong hdr->h_checksum = ext4_xattr_block_csum(inode, block_nr, hdr); 161cc8e94fdSDarrick J. Wong } 162cc8e94fdSDarrick J. Wong 163cc8e94fdSDarrick J. Wong static inline int ext4_handle_dirty_xattr_block(handle_t *handle, 164cc8e94fdSDarrick J. Wong struct inode *inode, 165cc8e94fdSDarrick J. Wong struct buffer_head *bh) 166cc8e94fdSDarrick J. Wong { 167cc8e94fdSDarrick J. Wong ext4_xattr_block_csum_set(inode, bh->b_blocknr, BHDR(bh)); 168cc8e94fdSDarrick J. Wong return ext4_handle_dirty_metadata(handle, inode, bh); 169cc8e94fdSDarrick J. Wong } 170cc8e94fdSDarrick J. Wong 17111e27528SStephen Hemminger static inline const struct xattr_handler * 172617ba13bSMingming Cao ext4_xattr_handler(int name_index) 173ac27a0ecSDave Kleikamp { 17411e27528SStephen Hemminger const struct xattr_handler *handler = NULL; 175ac27a0ecSDave Kleikamp 176617ba13bSMingming Cao if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) 177617ba13bSMingming Cao handler = ext4_xattr_handler_map[name_index]; 178ac27a0ecSDave Kleikamp return handler; 179ac27a0ecSDave Kleikamp } 180ac27a0ecSDave Kleikamp 181ac27a0ecSDave Kleikamp /* 182ac27a0ecSDave Kleikamp * Inode operation listxattr() 183ac27a0ecSDave Kleikamp * 184ac27a0ecSDave Kleikamp * dentry->d_inode->i_mutex: don't care 185ac27a0ecSDave Kleikamp */ 186ac27a0ecSDave Kleikamp ssize_t 187617ba13bSMingming Cao ext4_listxattr(struct dentry *dentry, char *buffer, size_t size) 188ac27a0ecSDave Kleikamp { 189431547b3SChristoph Hellwig return ext4_xattr_list(dentry, buffer, size); 190ac27a0ecSDave Kleikamp } 191ac27a0ecSDave Kleikamp 192ac27a0ecSDave Kleikamp static int 193617ba13bSMingming Cao ext4_xattr_check_names(struct ext4_xattr_entry *entry, void *end) 194ac27a0ecSDave Kleikamp { 195ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry)) { 196617ba13bSMingming Cao struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(entry); 197ac27a0ecSDave Kleikamp if ((void *)next >= end) 198ac27a0ecSDave Kleikamp return -EIO; 199ac27a0ecSDave Kleikamp entry = next; 200ac27a0ecSDave Kleikamp } 201ac27a0ecSDave Kleikamp return 0; 202ac27a0ecSDave Kleikamp } 203ac27a0ecSDave Kleikamp 204ac27a0ecSDave Kleikamp static inline int 205cc8e94fdSDarrick J. Wong ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) 206ac27a0ecSDave Kleikamp { 207cc8e94fdSDarrick J. Wong int error; 208cc8e94fdSDarrick J. Wong 209cc8e94fdSDarrick J. Wong if (buffer_verified(bh)) 210cc8e94fdSDarrick J. Wong return 0; 211cc8e94fdSDarrick J. Wong 212617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 213ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) 214ac27a0ecSDave Kleikamp return -EIO; 215cc8e94fdSDarrick J. Wong if (!ext4_xattr_block_csum_verify(inode, bh->b_blocknr, BHDR(bh))) 216cc8e94fdSDarrick J. Wong return -EIO; 217cc8e94fdSDarrick J. Wong error = ext4_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size); 218cc8e94fdSDarrick J. Wong if (!error) 219cc8e94fdSDarrick J. Wong set_buffer_verified(bh); 220cc8e94fdSDarrick J. Wong return error; 221ac27a0ecSDave Kleikamp } 222ac27a0ecSDave Kleikamp 223ac27a0ecSDave Kleikamp static inline int 224617ba13bSMingming Cao ext4_xattr_check_entry(struct ext4_xattr_entry *entry, size_t size) 225ac27a0ecSDave Kleikamp { 226ac27a0ecSDave Kleikamp size_t value_size = le32_to_cpu(entry->e_value_size); 227ac27a0ecSDave Kleikamp 228ac27a0ecSDave Kleikamp if (entry->e_value_block != 0 || value_size > size || 229ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs) + value_size > size) 230ac27a0ecSDave Kleikamp return -EIO; 231ac27a0ecSDave Kleikamp return 0; 232ac27a0ecSDave Kleikamp } 233ac27a0ecSDave Kleikamp 234ac27a0ecSDave Kleikamp static int 235617ba13bSMingming Cao ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, 236ac27a0ecSDave Kleikamp const char *name, size_t size, int sorted) 237ac27a0ecSDave Kleikamp { 238617ba13bSMingming Cao struct ext4_xattr_entry *entry; 239ac27a0ecSDave Kleikamp size_t name_len; 240ac27a0ecSDave Kleikamp int cmp = 1; 241ac27a0ecSDave Kleikamp 242ac27a0ecSDave Kleikamp if (name == NULL) 243ac27a0ecSDave Kleikamp return -EINVAL; 244ac27a0ecSDave Kleikamp name_len = strlen(name); 245ac27a0ecSDave Kleikamp entry = *pentry; 246617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 247ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 248ac27a0ecSDave Kleikamp if (!cmp) 249ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 250ac27a0ecSDave Kleikamp if (!cmp) 251ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 252ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 253ac27a0ecSDave Kleikamp break; 254ac27a0ecSDave Kleikamp } 255ac27a0ecSDave Kleikamp *pentry = entry; 256617ba13bSMingming Cao if (!cmp && ext4_xattr_check_entry(entry, size)) 257ac27a0ecSDave Kleikamp return -EIO; 258ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 259ac27a0ecSDave Kleikamp } 260ac27a0ecSDave Kleikamp 261ac27a0ecSDave Kleikamp static int 262617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 263ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 264ac27a0ecSDave Kleikamp { 265ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 266617ba13bSMingming Cao struct ext4_xattr_entry *entry; 267ac27a0ecSDave Kleikamp size_t size; 268ac27a0ecSDave Kleikamp int error; 2699c191f70ST Makphaibulchoke struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 270ac27a0ecSDave Kleikamp 271ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 272ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 273ac27a0ecSDave Kleikamp 274ac27a0ecSDave Kleikamp error = -ENODATA; 275617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 276ac27a0ecSDave Kleikamp goto cleanup; 277ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 278ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 279617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 280ac27a0ecSDave Kleikamp if (!bh) 281ac27a0ecSDave Kleikamp goto cleanup; 282ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 283ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 284cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 28512062dddSEric Sandeen bad_block: 28624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 287617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 288ac27a0ecSDave Kleikamp error = -EIO; 289ac27a0ecSDave Kleikamp goto cleanup; 290ac27a0ecSDave Kleikamp } 2919c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, bh); 292ac27a0ecSDave Kleikamp entry = BFIRST(bh); 293617ba13bSMingming Cao error = ext4_xattr_find_entry(&entry, name_index, name, bh->b_size, 1); 294ac27a0ecSDave Kleikamp if (error == -EIO) 295ac27a0ecSDave Kleikamp goto bad_block; 296ac27a0ecSDave Kleikamp if (error) 297ac27a0ecSDave Kleikamp goto cleanup; 298ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 299ac27a0ecSDave Kleikamp if (buffer) { 300ac27a0ecSDave Kleikamp error = -ERANGE; 301ac27a0ecSDave Kleikamp if (size > buffer_size) 302ac27a0ecSDave Kleikamp goto cleanup; 303ac27a0ecSDave Kleikamp memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs), 304ac27a0ecSDave Kleikamp size); 305ac27a0ecSDave Kleikamp } 306ac27a0ecSDave Kleikamp error = size; 307ac27a0ecSDave Kleikamp 308ac27a0ecSDave Kleikamp cleanup: 309ac27a0ecSDave Kleikamp brelse(bh); 310ac27a0ecSDave Kleikamp return error; 311ac27a0ecSDave Kleikamp } 312ac27a0ecSDave Kleikamp 313879b3825STao Ma int 314617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 315ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 316ac27a0ecSDave Kleikamp { 317617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 318617ba13bSMingming Cao struct ext4_xattr_entry *entry; 319617ba13bSMingming Cao struct ext4_inode *raw_inode; 320617ba13bSMingming Cao struct ext4_iloc iloc; 321ac27a0ecSDave Kleikamp size_t size; 322ac27a0ecSDave Kleikamp void *end; 323ac27a0ecSDave Kleikamp int error; 324ac27a0ecSDave Kleikamp 32519f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 326ac27a0ecSDave Kleikamp return -ENODATA; 327617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 328ac27a0ecSDave Kleikamp if (error) 329ac27a0ecSDave Kleikamp return error; 330617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 331ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 332ac27a0ecSDave Kleikamp entry = IFIRST(header); 333617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 334617ba13bSMingming Cao error = ext4_xattr_check_names(entry, end); 335ac27a0ecSDave Kleikamp if (error) 336ac27a0ecSDave Kleikamp goto cleanup; 337617ba13bSMingming Cao error = ext4_xattr_find_entry(&entry, name_index, name, 338ac27a0ecSDave Kleikamp end - (void *)entry, 0); 339ac27a0ecSDave Kleikamp if (error) 340ac27a0ecSDave Kleikamp goto cleanup; 341ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 342ac27a0ecSDave Kleikamp if (buffer) { 343ac27a0ecSDave Kleikamp error = -ERANGE; 344ac27a0ecSDave Kleikamp if (size > buffer_size) 345ac27a0ecSDave Kleikamp goto cleanup; 346ac27a0ecSDave Kleikamp memcpy(buffer, (void *)IFIRST(header) + 347ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs), size); 348ac27a0ecSDave Kleikamp } 349ac27a0ecSDave Kleikamp error = size; 350ac27a0ecSDave Kleikamp 351ac27a0ecSDave Kleikamp cleanup: 352ac27a0ecSDave Kleikamp brelse(iloc.bh); 353ac27a0ecSDave Kleikamp return error; 354ac27a0ecSDave Kleikamp } 355ac27a0ecSDave Kleikamp 356ac27a0ecSDave Kleikamp /* 357617ba13bSMingming Cao * ext4_xattr_get() 358ac27a0ecSDave Kleikamp * 359ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 360ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 361ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 362ac27a0ecSDave Kleikamp * 363ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 364ac27a0ecSDave Kleikamp * used / required on success. 365ac27a0ecSDave Kleikamp */ 366ac27a0ecSDave Kleikamp int 367617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 368ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 369ac27a0ecSDave Kleikamp { 370ac27a0ecSDave Kleikamp int error; 371ac27a0ecSDave Kleikamp 372*230b8c1aSZhang Zhen if (strlen(name) > 255) 373*230b8c1aSZhang Zhen return -ERANGE; 374*230b8c1aSZhang Zhen 375617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 376617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 377ac27a0ecSDave Kleikamp buffer_size); 378ac27a0ecSDave Kleikamp if (error == -ENODATA) 379617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 380ac27a0ecSDave Kleikamp buffer_size); 381617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 382ac27a0ecSDave Kleikamp return error; 383ac27a0ecSDave Kleikamp } 384ac27a0ecSDave Kleikamp 385ac27a0ecSDave Kleikamp static int 386431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 387ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 388ac27a0ecSDave Kleikamp { 389ac27a0ecSDave Kleikamp size_t rest = buffer_size; 390ac27a0ecSDave Kleikamp 391617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 39211e27528SStephen Hemminger const struct xattr_handler *handler = 393617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 394ac27a0ecSDave Kleikamp 395ac27a0ecSDave Kleikamp if (handler) { 396431547b3SChristoph Hellwig size_t size = handler->list(dentry, buffer, rest, 397ac27a0ecSDave Kleikamp entry->e_name, 398431547b3SChristoph Hellwig entry->e_name_len, 399431547b3SChristoph Hellwig handler->flags); 400ac27a0ecSDave Kleikamp if (buffer) { 401ac27a0ecSDave Kleikamp if (size > rest) 402ac27a0ecSDave Kleikamp return -ERANGE; 403ac27a0ecSDave Kleikamp buffer += size; 404ac27a0ecSDave Kleikamp } 405ac27a0ecSDave Kleikamp rest -= size; 406ac27a0ecSDave Kleikamp } 407ac27a0ecSDave Kleikamp } 408ac27a0ecSDave Kleikamp return buffer_size - rest; 409ac27a0ecSDave Kleikamp } 410ac27a0ecSDave Kleikamp 411ac27a0ecSDave Kleikamp static int 412431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 413ac27a0ecSDave Kleikamp { 414431547b3SChristoph Hellwig struct inode *inode = dentry->d_inode; 415ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 416ac27a0ecSDave Kleikamp int error; 4179c191f70ST Makphaibulchoke struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 418ac27a0ecSDave Kleikamp 419ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 420ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 421ac27a0ecSDave Kleikamp 422ac27a0ecSDave Kleikamp error = 0; 423617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 424ac27a0ecSDave Kleikamp goto cleanup; 425ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 426ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 427617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 428ac27a0ecSDave Kleikamp error = -EIO; 429ac27a0ecSDave Kleikamp if (!bh) 430ac27a0ecSDave Kleikamp goto cleanup; 431ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 432ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 433cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 43424676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 435617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 436ac27a0ecSDave Kleikamp error = -EIO; 437ac27a0ecSDave Kleikamp goto cleanup; 438ac27a0ecSDave Kleikamp } 4399c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, bh); 440431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); 441ac27a0ecSDave Kleikamp 442ac27a0ecSDave Kleikamp cleanup: 443ac27a0ecSDave Kleikamp brelse(bh); 444ac27a0ecSDave Kleikamp 445ac27a0ecSDave Kleikamp return error; 446ac27a0ecSDave Kleikamp } 447ac27a0ecSDave Kleikamp 448ac27a0ecSDave Kleikamp static int 449431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 450ac27a0ecSDave Kleikamp { 451431547b3SChristoph Hellwig struct inode *inode = dentry->d_inode; 452617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 453617ba13bSMingming Cao struct ext4_inode *raw_inode; 454617ba13bSMingming Cao struct ext4_iloc iloc; 455ac27a0ecSDave Kleikamp void *end; 456ac27a0ecSDave Kleikamp int error; 457ac27a0ecSDave Kleikamp 45819f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 459ac27a0ecSDave Kleikamp return 0; 460617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 461ac27a0ecSDave Kleikamp if (error) 462ac27a0ecSDave Kleikamp return error; 463617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 464ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 465617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 466617ba13bSMingming Cao error = ext4_xattr_check_names(IFIRST(header), end); 467ac27a0ecSDave Kleikamp if (error) 468ac27a0ecSDave Kleikamp goto cleanup; 469431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 470ac27a0ecSDave Kleikamp buffer, buffer_size); 471ac27a0ecSDave Kleikamp 472ac27a0ecSDave Kleikamp cleanup: 473ac27a0ecSDave Kleikamp brelse(iloc.bh); 474ac27a0ecSDave Kleikamp return error; 475ac27a0ecSDave Kleikamp } 476ac27a0ecSDave Kleikamp 477ac27a0ecSDave Kleikamp /* 478617ba13bSMingming Cao * ext4_xattr_list() 479ac27a0ecSDave Kleikamp * 480ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 481ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 482ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 483ac27a0ecSDave Kleikamp * 484ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 485ac27a0ecSDave Kleikamp * used / required on success. 486ac27a0ecSDave Kleikamp */ 487d3a95d47SMingming Cao static int 488431547b3SChristoph Hellwig ext4_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size) 489ac27a0ecSDave Kleikamp { 490eaeef867STheodore Ts'o int ret, ret2; 491ac27a0ecSDave Kleikamp 492431547b3SChristoph Hellwig down_read(&EXT4_I(dentry->d_inode)->xattr_sem); 493eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 494eaeef867STheodore Ts'o if (ret < 0) 495eaeef867STheodore Ts'o goto errout; 496ac27a0ecSDave Kleikamp if (buffer) { 497eaeef867STheodore Ts'o buffer += ret; 498eaeef867STheodore Ts'o buffer_size -= ret; 499ac27a0ecSDave Kleikamp } 500eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 501eaeef867STheodore Ts'o if (ret < 0) 502eaeef867STheodore Ts'o goto errout; 503eaeef867STheodore Ts'o ret += ret2; 504eaeef867STheodore Ts'o errout: 505431547b3SChristoph Hellwig up_read(&EXT4_I(dentry->d_inode)->xattr_sem); 506eaeef867STheodore Ts'o return ret; 507ac27a0ecSDave Kleikamp } 508ac27a0ecSDave Kleikamp 509ac27a0ecSDave Kleikamp /* 510617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 511ac27a0ecSDave Kleikamp * not set, set it. 512ac27a0ecSDave Kleikamp */ 513617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 514ac27a0ecSDave Kleikamp struct super_block *sb) 515ac27a0ecSDave Kleikamp { 516617ba13bSMingming Cao if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_EXT_ATTR)) 517ac27a0ecSDave Kleikamp return; 518ac27a0ecSDave Kleikamp 519617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 520ed2908f3SAndreas Gruenbacher EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_EXT_ATTR); 521a0375156STheodore Ts'o ext4_handle_dirty_super(handle, sb); 522ac27a0ecSDave Kleikamp } 523ac27a0ecSDave Kleikamp } 524ac27a0ecSDave Kleikamp 525ac27a0ecSDave Kleikamp /* 526ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 527ec4cb1aaSJan Kara * otherwise free the block. 528ac27a0ecSDave Kleikamp */ 529ac27a0ecSDave Kleikamp static void 530617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 531ac27a0ecSDave Kleikamp struct buffer_head *bh) 532ac27a0ecSDave Kleikamp { 533ac27a0ecSDave Kleikamp struct mb_cache_entry *ce = NULL; 5348a2bfdcbSMingming Cao int error = 0; 5359c191f70ST Makphaibulchoke struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 536ac27a0ecSDave Kleikamp 5379c191f70ST Makphaibulchoke ce = mb_cache_entry_get(ext4_mb_cache, bh->b_bdev, bh->b_blocknr); 5388a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 5398a2bfdcbSMingming Cao if (error) 5408a2bfdcbSMingming Cao goto out; 5418a2bfdcbSMingming Cao 5428a2bfdcbSMingming Cao lock_buffer(bh); 543ac27a0ecSDave Kleikamp if (BHDR(bh)->h_refcount == cpu_to_le32(1)) { 544ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 545ac27a0ecSDave Kleikamp if (ce) 546ac27a0ecSDave Kleikamp mb_cache_entry_free(ce); 547ac27a0ecSDave Kleikamp get_bh(bh); 548ec4cb1aaSJan Kara unlock_buffer(bh); 549e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 550e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 551e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 552ac27a0ecSDave Kleikamp } else { 553e8546d06SMarcin Slusarz le32_add_cpu(&BHDR(bh)->h_refcount, -1); 554c1bb05a6SEric Sandeen if (ce) 555c1bb05a6SEric Sandeen mb_cache_entry_release(ce); 556ec4cb1aaSJan Kara /* 557ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 558ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 559ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 560ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 561ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 562ec4cb1aaSJan Kara * call ext4_handle_dirty_xattr_block() with locked buffer as 563ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 564ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 565ec4cb1aaSJan Kara */ 566ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 567ec4cb1aaSJan Kara error = ext4_handle_dirty_xattr_block(handle, inode, 568ec4cb1aaSJan Kara bh); 569c1bb05a6SEric Sandeen unlock_buffer(bh); 570ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 571ec4cb1aaSJan Kara error = ext4_handle_dirty_xattr_block(handle, inode, 572ec4cb1aaSJan Kara bh); 573ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 5740390131bSFrank Mayhar ext4_handle_sync(handle); 5751231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 576ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 577ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 578ac27a0ecSDave Kleikamp } 5798a2bfdcbSMingming Cao out: 5808a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 5818a2bfdcbSMingming Cao return; 582ac27a0ecSDave Kleikamp } 583ac27a0ecSDave Kleikamp 5846dd4ee7cSKalpak Shah /* 5856dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 5866dd4ee7cSKalpak Shah * bytes used by EA entries. 5876dd4ee7cSKalpak Shah */ 5886dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 5896dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 5906dd4ee7cSKalpak Shah { 5916dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 5926dd4ee7cSKalpak Shah if (!last->e_value_block && last->e_value_size) { 5936dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 5946dd4ee7cSKalpak Shah if (offs < *min_offs) 5956dd4ee7cSKalpak Shah *min_offs = offs; 5966dd4ee7cSKalpak Shah } 5977b1b2c1bSTheodore Ts'o if (total) 5987b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 5996dd4ee7cSKalpak Shah } 6006dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 6016dd4ee7cSKalpak Shah } 6026dd4ee7cSKalpak Shah 603ac27a0ecSDave Kleikamp static int 604617ba13bSMingming Cao ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s) 605ac27a0ecSDave Kleikamp { 606617ba13bSMingming Cao struct ext4_xattr_entry *last; 607ac27a0ecSDave Kleikamp size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); 608ac27a0ecSDave Kleikamp 609ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 610ac27a0ecSDave Kleikamp last = s->first; 611617ba13bSMingming Cao for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 612ac27a0ecSDave Kleikamp if (!last->e_value_block && last->e_value_size) { 613ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 614ac27a0ecSDave Kleikamp if (offs < min_offs) 615ac27a0ecSDave Kleikamp min_offs = offs; 616ac27a0ecSDave Kleikamp } 617ac27a0ecSDave Kleikamp } 618ac27a0ecSDave Kleikamp free = min_offs - ((void *)last - s->base) - sizeof(__u32); 619ac27a0ecSDave Kleikamp if (!s->not_found) { 620ac27a0ecSDave Kleikamp if (!s->here->e_value_block && s->here->e_value_size) { 621ac27a0ecSDave Kleikamp size_t size = le32_to_cpu(s->here->e_value_size); 622617ba13bSMingming Cao free += EXT4_XATTR_SIZE(size); 623ac27a0ecSDave Kleikamp } 624617ba13bSMingming Cao free += EXT4_XATTR_LEN(name_len); 625ac27a0ecSDave Kleikamp } 626ac27a0ecSDave Kleikamp if (i->value) { 627617ba13bSMingming Cao if (free < EXT4_XATTR_SIZE(i->value_len) || 628617ba13bSMingming Cao free < EXT4_XATTR_LEN(name_len) + 629617ba13bSMingming Cao EXT4_XATTR_SIZE(i->value_len)) 630ac27a0ecSDave Kleikamp return -ENOSPC; 631ac27a0ecSDave Kleikamp } 632ac27a0ecSDave Kleikamp 633ac27a0ecSDave Kleikamp if (i->value && s->not_found) { 634ac27a0ecSDave Kleikamp /* Insert the new name. */ 635617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 636ac27a0ecSDave Kleikamp size_t rest = (void *)last - (void *)s->here + sizeof(__u32); 637ac27a0ecSDave Kleikamp memmove((void *)s->here + size, s->here, rest); 638ac27a0ecSDave Kleikamp memset(s->here, 0, size); 639ac27a0ecSDave Kleikamp s->here->e_name_index = i->name_index; 640ac27a0ecSDave Kleikamp s->here->e_name_len = name_len; 641ac27a0ecSDave Kleikamp memcpy(s->here->e_name, i->name, name_len); 642ac27a0ecSDave Kleikamp } else { 643ac27a0ecSDave Kleikamp if (!s->here->e_value_block && s->here->e_value_size) { 644ac27a0ecSDave Kleikamp void *first_val = s->base + min_offs; 645ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(s->here->e_value_offs); 646ac27a0ecSDave Kleikamp void *val = s->base + offs; 647617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE( 648ac27a0ecSDave Kleikamp le32_to_cpu(s->here->e_value_size)); 649ac27a0ecSDave Kleikamp 650617ba13bSMingming Cao if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { 651ac27a0ecSDave Kleikamp /* The old and the new value have the same 652ac27a0ecSDave Kleikamp size. Just replace. */ 653ac27a0ecSDave Kleikamp s->here->e_value_size = 654ac27a0ecSDave Kleikamp cpu_to_le32(i->value_len); 655bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 656bd9926e8STheodore Ts'o memset(val, 0, size); 657bd9926e8STheodore Ts'o } else { 658bd9926e8STheodore Ts'o /* Clear pad bytes first. */ 659617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 660bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 661ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 662bd9926e8STheodore Ts'o } 663ac27a0ecSDave Kleikamp return 0; 664ac27a0ecSDave Kleikamp } 665ac27a0ecSDave Kleikamp 666ac27a0ecSDave Kleikamp /* Remove the old value. */ 667ac27a0ecSDave Kleikamp memmove(first_val + size, first_val, val - first_val); 668ac27a0ecSDave Kleikamp memset(first_val, 0, size); 669ac27a0ecSDave Kleikamp s->here->e_value_size = 0; 670ac27a0ecSDave Kleikamp s->here->e_value_offs = 0; 671ac27a0ecSDave Kleikamp min_offs += size; 672ac27a0ecSDave Kleikamp 673ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 674ac27a0ecSDave Kleikamp last = s->first; 675ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 676ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 677ac27a0ecSDave Kleikamp if (!last->e_value_block && 678ac27a0ecSDave Kleikamp last->e_value_size && o < offs) 679ac27a0ecSDave Kleikamp last->e_value_offs = 680ac27a0ecSDave Kleikamp cpu_to_le16(o + size); 681617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 682ac27a0ecSDave Kleikamp } 683ac27a0ecSDave Kleikamp } 684ac27a0ecSDave Kleikamp if (!i->value) { 685ac27a0ecSDave Kleikamp /* Remove the old name. */ 686617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 687ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 688ac27a0ecSDave Kleikamp memmove(s->here, (void *)s->here + size, 689ac27a0ecSDave Kleikamp (void *)last - (void *)s->here + sizeof(__u32)); 690ac27a0ecSDave Kleikamp memset(last, 0, size); 691ac27a0ecSDave Kleikamp } 692ac27a0ecSDave Kleikamp } 693ac27a0ecSDave Kleikamp 694ac27a0ecSDave Kleikamp if (i->value) { 695ac27a0ecSDave Kleikamp /* Insert the new value. */ 696ac27a0ecSDave Kleikamp s->here->e_value_size = cpu_to_le32(i->value_len); 697ac27a0ecSDave Kleikamp if (i->value_len) { 698617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE(i->value_len); 699ac27a0ecSDave Kleikamp void *val = s->base + min_offs - size; 700ac27a0ecSDave Kleikamp s->here->e_value_offs = cpu_to_le16(min_offs - size); 701bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 702bd9926e8STheodore Ts'o memset(val, 0, size); 703bd9926e8STheodore Ts'o } else { 704bd9926e8STheodore Ts'o /* Clear the pad bytes first. */ 705617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 706bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 707ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 708ac27a0ecSDave Kleikamp } 709ac27a0ecSDave Kleikamp } 710bd9926e8STheodore Ts'o } 711ac27a0ecSDave Kleikamp return 0; 712ac27a0ecSDave Kleikamp } 713ac27a0ecSDave Kleikamp 714617ba13bSMingming Cao struct ext4_xattr_block_find { 715617ba13bSMingming Cao struct ext4_xattr_search s; 716ac27a0ecSDave Kleikamp struct buffer_head *bh; 717ac27a0ecSDave Kleikamp }; 718ac27a0ecSDave Kleikamp 719ac27a0ecSDave Kleikamp static int 720617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 721617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 722ac27a0ecSDave Kleikamp { 723ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 724ac27a0ecSDave Kleikamp int error; 725ac27a0ecSDave Kleikamp 726ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 727ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 728ac27a0ecSDave Kleikamp 729617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 730ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 731617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 732ac27a0ecSDave Kleikamp error = -EIO; 733ac27a0ecSDave Kleikamp if (!bs->bh) 734ac27a0ecSDave Kleikamp goto cleanup; 735ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 736ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 737ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 738cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bs->bh)) { 73924676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 74024676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 741ac27a0ecSDave Kleikamp error = -EIO; 742ac27a0ecSDave Kleikamp goto cleanup; 743ac27a0ecSDave Kleikamp } 744ac27a0ecSDave Kleikamp /* Find the named attribute. */ 745ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 746ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 747ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 748ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 749617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 750ac27a0ecSDave Kleikamp i->name, bs->bh->b_size, 1); 751ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 752ac27a0ecSDave Kleikamp goto cleanup; 753ac27a0ecSDave Kleikamp bs->s.not_found = error; 754ac27a0ecSDave Kleikamp } 755ac27a0ecSDave Kleikamp error = 0; 756ac27a0ecSDave Kleikamp 757ac27a0ecSDave Kleikamp cleanup: 758ac27a0ecSDave Kleikamp return error; 759ac27a0ecSDave Kleikamp } 760ac27a0ecSDave Kleikamp 761ac27a0ecSDave Kleikamp static int 762617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 763617ba13bSMingming Cao struct ext4_xattr_info *i, 764617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 765ac27a0ecSDave Kleikamp { 766ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 767ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 768617ba13bSMingming Cao struct ext4_xattr_search *s = &bs->s; 769ac27a0ecSDave Kleikamp struct mb_cache_entry *ce = NULL; 7708a2bfdcbSMingming Cao int error = 0; 7719c191f70ST Makphaibulchoke struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 772ac27a0ecSDave Kleikamp 773617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 774ac27a0ecSDave Kleikamp 775ac27a0ecSDave Kleikamp if (i->value && i->value_len > sb->s_blocksize) 776ac27a0ecSDave Kleikamp return -ENOSPC; 777ac27a0ecSDave Kleikamp if (s->base) { 7789c191f70ST Makphaibulchoke ce = mb_cache_entry_get(ext4_mb_cache, bs->bh->b_bdev, 779ac27a0ecSDave Kleikamp bs->bh->b_blocknr); 7808a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 7818a2bfdcbSMingming Cao if (error) 7828a2bfdcbSMingming Cao goto cleanup; 7838a2bfdcbSMingming Cao lock_buffer(bs->bh); 7848a2bfdcbSMingming Cao 785ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 786ac27a0ecSDave Kleikamp if (ce) { 787ac27a0ecSDave Kleikamp mb_cache_entry_free(ce); 788ac27a0ecSDave Kleikamp ce = NULL; 789ac27a0ecSDave Kleikamp } 790ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 791617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 792ac27a0ecSDave Kleikamp if (!error) { 793ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 794617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), 795ac27a0ecSDave Kleikamp s->here); 7969c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, 7979c191f70ST Makphaibulchoke bs->bh); 798ac27a0ecSDave Kleikamp } 799ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 800ac27a0ecSDave Kleikamp if (error == -EIO) 801ac27a0ecSDave Kleikamp goto bad_block; 802ac27a0ecSDave Kleikamp if (!error) 803cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 8040390131bSFrank Mayhar inode, 805ac27a0ecSDave Kleikamp bs->bh); 806ac27a0ecSDave Kleikamp if (error) 807ac27a0ecSDave Kleikamp goto cleanup; 808ac27a0ecSDave Kleikamp goto inserted; 809ac27a0ecSDave Kleikamp } else { 810ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 811ac27a0ecSDave Kleikamp 8128a2bfdcbSMingming Cao unlock_buffer(bs->bh); 813ac27a0ecSDave Kleikamp if (ce) { 814ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 815ac27a0ecSDave Kleikamp ce = NULL; 816ac27a0ecSDave Kleikamp } 817ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 818216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 819ac27a0ecSDave Kleikamp error = -ENOMEM; 820ac27a0ecSDave Kleikamp if (s->base == NULL) 821ac27a0ecSDave Kleikamp goto cleanup; 822ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 823ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 824ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 825ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 826ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 827ac27a0ecSDave Kleikamp } 828ac27a0ecSDave Kleikamp } else { 829ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 830216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 831ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 832ac27a0ecSDave Kleikamp error = -ENOMEM; 833ac27a0ecSDave Kleikamp if (s->base == NULL) 834ac27a0ecSDave Kleikamp goto cleanup; 835617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 836ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 837ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 838ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 839ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 840ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 841ac27a0ecSDave Kleikamp } 842ac27a0ecSDave Kleikamp 843617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 844ac27a0ecSDave Kleikamp if (error == -EIO) 845ac27a0ecSDave Kleikamp goto bad_block; 846ac27a0ecSDave Kleikamp if (error) 847ac27a0ecSDave Kleikamp goto cleanup; 848ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 849617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), s->here); 850ac27a0ecSDave Kleikamp 851ac27a0ecSDave Kleikamp inserted: 852ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 853617ba13bSMingming Cao new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); 854ac27a0ecSDave Kleikamp if (new_bh) { 855ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 856ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 857ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 858ac27a0ecSDave Kleikamp else { 859ac27a0ecSDave Kleikamp /* The old block is released after updating 860ac27a0ecSDave Kleikamp the inode. */ 8611231b3a1SLukas Czerner error = dquot_alloc_block(inode, 8621231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 8635dd4056dSChristoph Hellwig if (error) 864ac27a0ecSDave Kleikamp goto cleanup; 865617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 866ac27a0ecSDave Kleikamp new_bh); 867ac27a0ecSDave Kleikamp if (error) 868ac27a0ecSDave Kleikamp goto cleanup_dquot; 869ac27a0ecSDave Kleikamp lock_buffer(new_bh); 870e8546d06SMarcin Slusarz le32_add_cpu(&BHDR(new_bh)->h_refcount, 1); 871ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 872ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(new_bh)->h_refcount)); 873ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 874cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 8750390131bSFrank Mayhar inode, 876ac27a0ecSDave Kleikamp new_bh); 877ac27a0ecSDave Kleikamp if (error) 878ac27a0ecSDave Kleikamp goto cleanup_dquot; 879ac27a0ecSDave Kleikamp } 880ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 881ac27a0ecSDave Kleikamp ce = NULL; 882ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 883ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 884ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 885ac27a0ecSDave Kleikamp new_bh = bs->bh; 886ac27a0ecSDave Kleikamp get_bh(new_bh); 887ac27a0ecSDave Kleikamp } else { 888ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 889fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 890fb0a387dSEric Sandeen 891fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 892d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 893fb0a387dSEric Sandeen 894fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 89512e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 896fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 897fb0a387dSEric Sandeen 8986d6a4351SEric Sandeen /* 8996d6a4351SEric Sandeen * take i_data_sem because we will test 9006d6a4351SEric Sandeen * i_delalloc_reserved_flag in ext4_mb_new_blocks 9016d6a4351SEric Sandeen */ 9026d6a4351SEric Sandeen down_read((&EXT4_I(inode)->i_data_sem)); 90355f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 90455f020dbSAllison Henderson NULL, &error); 9056d6a4351SEric Sandeen up_read((&EXT4_I(inode)->i_data_sem)); 906ac27a0ecSDave Kleikamp if (error) 907ac27a0ecSDave Kleikamp goto cleanup; 908fb0a387dSEric Sandeen 90912e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 910fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 911fb0a387dSEric Sandeen 912ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 913ace36ad4SJoe Perches (unsigned long long)block); 914ac27a0ecSDave Kleikamp 915ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 916aebf0243SWang Shilong if (unlikely(!new_bh)) { 917860d21e2STheodore Ts'o error = -ENOMEM; 918ac27a0ecSDave Kleikamp getblk_failed: 9197dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 920e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 921ac27a0ecSDave Kleikamp goto cleanup; 922ac27a0ecSDave Kleikamp } 923ac27a0ecSDave Kleikamp lock_buffer(new_bh); 924617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 925ac27a0ecSDave Kleikamp if (error) { 926ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 927860d21e2STheodore Ts'o error = -EIO; 928ac27a0ecSDave Kleikamp goto getblk_failed; 929ac27a0ecSDave Kleikamp } 930ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 931ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 932ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 9339c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, new_bh); 934cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 9350390131bSFrank Mayhar inode, new_bh); 936ac27a0ecSDave Kleikamp if (error) 937ac27a0ecSDave Kleikamp goto cleanup; 938ac27a0ecSDave Kleikamp } 939ac27a0ecSDave Kleikamp } 940ac27a0ecSDave Kleikamp 941ac27a0ecSDave Kleikamp /* Update the inode. */ 942617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 943ac27a0ecSDave Kleikamp 944ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 945ac27a0ecSDave Kleikamp if (bs->bh && bs->bh != new_bh) 946617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bs->bh); 947ac27a0ecSDave Kleikamp error = 0; 948ac27a0ecSDave Kleikamp 949ac27a0ecSDave Kleikamp cleanup: 950ac27a0ecSDave Kleikamp if (ce) 951ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 952ac27a0ecSDave Kleikamp brelse(new_bh); 953ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 954ac27a0ecSDave Kleikamp kfree(s->base); 955ac27a0ecSDave Kleikamp 956ac27a0ecSDave Kleikamp return error; 957ac27a0ecSDave Kleikamp 958ac27a0ecSDave Kleikamp cleanup_dquot: 9591231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 960ac27a0ecSDave Kleikamp goto cleanup; 961ac27a0ecSDave Kleikamp 962ac27a0ecSDave Kleikamp bad_block: 96324676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 96424676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 965ac27a0ecSDave Kleikamp goto cleanup; 966ac27a0ecSDave Kleikamp 967ac27a0ecSDave Kleikamp #undef header 968ac27a0ecSDave Kleikamp } 969ac27a0ecSDave Kleikamp 970879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 971617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 972ac27a0ecSDave Kleikamp { 973617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 974617ba13bSMingming Cao struct ext4_inode *raw_inode; 975ac27a0ecSDave Kleikamp int error; 976ac27a0ecSDave Kleikamp 977617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 978ac27a0ecSDave Kleikamp return 0; 979617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 980ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 981ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 982ac27a0ecSDave Kleikamp is->s.here = is->s.first; 983617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 98419f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 985617ba13bSMingming Cao error = ext4_xattr_check_names(IFIRST(header), is->s.end); 986ac27a0ecSDave Kleikamp if (error) 987ac27a0ecSDave Kleikamp return error; 988ac27a0ecSDave Kleikamp /* Find the named attribute. */ 989617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 990ac27a0ecSDave Kleikamp i->name, is->s.end - 991ac27a0ecSDave Kleikamp (void *)is->s.base, 0); 992ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 993ac27a0ecSDave Kleikamp return error; 994ac27a0ecSDave Kleikamp is->s.not_found = error; 995ac27a0ecSDave Kleikamp } 996ac27a0ecSDave Kleikamp return 0; 997ac27a0ecSDave Kleikamp } 998ac27a0ecSDave Kleikamp 9990d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 10000d812f77STao Ma struct ext4_xattr_info *i, 10010d812f77STao Ma struct ext4_xattr_ibody_find *is) 10020d812f77STao Ma { 10030d812f77STao Ma struct ext4_xattr_ibody_header *header; 10040d812f77STao Ma struct ext4_xattr_search *s = &is->s; 10050d812f77STao Ma int error; 10060d812f77STao Ma 10070d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 10080d812f77STao Ma return -ENOSPC; 10090d812f77STao Ma error = ext4_xattr_set_entry(i, s); 10100d812f77STao Ma if (error) { 10110d812f77STao Ma if (error == -ENOSPC && 10120d812f77STao Ma ext4_has_inline_data(inode)) { 10130d812f77STao Ma error = ext4_try_to_evict_inline_data(handle, inode, 10140d812f77STao Ma EXT4_XATTR_LEN(strlen(i->name) + 10150d812f77STao Ma EXT4_XATTR_SIZE(i->value_len))); 10160d812f77STao Ma if (error) 10170d812f77STao Ma return error; 10180d812f77STao Ma error = ext4_xattr_ibody_find(inode, i, is); 10190d812f77STao Ma if (error) 10200d812f77STao Ma return error; 10210d812f77STao Ma error = ext4_xattr_set_entry(i, s); 10220d812f77STao Ma } 10230d812f77STao Ma if (error) 10240d812f77STao Ma return error; 10250d812f77STao Ma } 10260d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 10270d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 10280d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 10290d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 10300d812f77STao Ma } else { 10310d812f77STao Ma header->h_magic = cpu_to_le32(0); 10320d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 10330d812f77STao Ma } 10340d812f77STao Ma return 0; 10350d812f77STao Ma } 10360d812f77STao Ma 10370d812f77STao Ma static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 1038617ba13bSMingming Cao struct ext4_xattr_info *i, 1039617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 1040ac27a0ecSDave Kleikamp { 1041617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 1042617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 1043ac27a0ecSDave Kleikamp int error; 1044ac27a0ecSDave Kleikamp 1045617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 1046ac27a0ecSDave Kleikamp return -ENOSPC; 1047617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 1048ac27a0ecSDave Kleikamp if (error) 1049ac27a0ecSDave Kleikamp return error; 1050617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 1051ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 1052617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 105319f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 1054ac27a0ecSDave Kleikamp } else { 1055ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 105619f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 1057ac27a0ecSDave Kleikamp } 1058ac27a0ecSDave Kleikamp return 0; 1059ac27a0ecSDave Kleikamp } 1060ac27a0ecSDave Kleikamp 1061ac27a0ecSDave Kleikamp /* 1062617ba13bSMingming Cao * ext4_xattr_set_handle() 1063ac27a0ecSDave Kleikamp * 10646e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 1065ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 1066ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 1067ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 1068ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 1069ac27a0ecSDave Kleikamp * previous to the call, respectively. 1070ac27a0ecSDave Kleikamp * 1071ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1072ac27a0ecSDave Kleikamp */ 1073ac27a0ecSDave Kleikamp int 1074617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 1075ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 1076ac27a0ecSDave Kleikamp int flags) 1077ac27a0ecSDave Kleikamp { 1078617ba13bSMingming Cao struct ext4_xattr_info i = { 1079ac27a0ecSDave Kleikamp .name_index = name_index, 1080ac27a0ecSDave Kleikamp .name = name, 1081ac27a0ecSDave Kleikamp .value = value, 1082ac27a0ecSDave Kleikamp .value_len = value_len, 1083ac27a0ecSDave Kleikamp 1084ac27a0ecSDave Kleikamp }; 1085617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 1086ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1087ac27a0ecSDave Kleikamp }; 1088617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 1089ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1090ac27a0ecSDave Kleikamp }; 10914d20c685SKalpak Shah unsigned long no_expand; 1092ac27a0ecSDave Kleikamp int error; 1093ac27a0ecSDave Kleikamp 1094ac27a0ecSDave Kleikamp if (!name) 1095ac27a0ecSDave Kleikamp return -EINVAL; 1096ac27a0ecSDave Kleikamp if (strlen(name) > 255) 1097ac27a0ecSDave Kleikamp return -ERANGE; 1098617ba13bSMingming Cao down_write(&EXT4_I(inode)->xattr_sem); 109919f5fb7aSTheodore Ts'o no_expand = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND); 110019f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND); 11014d20c685SKalpak Shah 110266543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 110386ebfd08SEric Sandeen if (error) 110486ebfd08SEric Sandeen goto cleanup; 110586ebfd08SEric Sandeen 110619f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 1107617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 1108617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 110919f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 1110ac27a0ecSDave Kleikamp } 1111ac27a0ecSDave Kleikamp 1112617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 1113ac27a0ecSDave Kleikamp if (error) 1114ac27a0ecSDave Kleikamp goto cleanup; 1115ac27a0ecSDave Kleikamp if (is.s.not_found) 1116617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 1117ac27a0ecSDave Kleikamp if (error) 1118ac27a0ecSDave Kleikamp goto cleanup; 1119ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 1120ac27a0ecSDave Kleikamp error = -ENODATA; 1121ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 1122ac27a0ecSDave Kleikamp goto cleanup; 1123ac27a0ecSDave Kleikamp error = 0; 1124ac27a0ecSDave Kleikamp if (!value) 1125ac27a0ecSDave Kleikamp goto cleanup; 1126ac27a0ecSDave Kleikamp } else { 1127ac27a0ecSDave Kleikamp error = -EEXIST; 1128ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 1129ac27a0ecSDave Kleikamp goto cleanup; 1130ac27a0ecSDave Kleikamp } 1131ac27a0ecSDave Kleikamp if (!value) { 1132ac27a0ecSDave Kleikamp if (!is.s.not_found) 1133617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1134ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 1135617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1136ac27a0ecSDave Kleikamp } else { 1137617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1138ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 1139ac27a0ecSDave Kleikamp i.value = NULL; 1140617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1141ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 11427e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 11437e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 11447e01c8e5STiger Yang if (error) 11457e01c8e5STiger Yang goto cleanup; 11467e01c8e5STiger Yang } 1147617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1148ac27a0ecSDave Kleikamp if (error) 1149ac27a0ecSDave Kleikamp goto cleanup; 1150ac27a0ecSDave Kleikamp if (!is.s.not_found) { 1151ac27a0ecSDave Kleikamp i.value = NULL; 1152617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, 1153ac27a0ecSDave Kleikamp &is); 1154ac27a0ecSDave Kleikamp } 1155ac27a0ecSDave Kleikamp } 1156ac27a0ecSDave Kleikamp } 1157ac27a0ecSDave Kleikamp if (!error) { 1158617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 1159ef7f3835SKalpak Shah inode->i_ctime = ext4_current_time(inode); 11606dd4ee7cSKalpak Shah if (!value) 116119f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); 1162617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 1163ac27a0ecSDave Kleikamp /* 1164617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 1165ac27a0ecSDave Kleikamp * error != 0. 1166ac27a0ecSDave Kleikamp */ 1167ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 1168ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 11690390131bSFrank Mayhar ext4_handle_sync(handle); 1170ac27a0ecSDave Kleikamp } 1171ac27a0ecSDave Kleikamp 1172ac27a0ecSDave Kleikamp cleanup: 1173ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 1174ac27a0ecSDave Kleikamp brelse(bs.bh); 11754d20c685SKalpak Shah if (no_expand == 0) 117619f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); 1177617ba13bSMingming Cao up_write(&EXT4_I(inode)->xattr_sem); 1178ac27a0ecSDave Kleikamp return error; 1179ac27a0ecSDave Kleikamp } 1180ac27a0ecSDave Kleikamp 1181ac27a0ecSDave Kleikamp /* 1182617ba13bSMingming Cao * ext4_xattr_set() 1183ac27a0ecSDave Kleikamp * 1184617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 1185ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 1186ac27a0ecSDave Kleikamp * 1187ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1188ac27a0ecSDave Kleikamp */ 1189ac27a0ecSDave Kleikamp int 1190617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 1191ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 1192ac27a0ecSDave Kleikamp { 1193ac27a0ecSDave Kleikamp handle_t *handle; 1194ac27a0ecSDave Kleikamp int error, retries = 0; 119595eaefbdSTheodore Ts'o int credits = ext4_jbd2_credits_xattr(inode); 1196ac27a0ecSDave Kleikamp 1197ac27a0ecSDave Kleikamp retry: 11989924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 1199ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 1200ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 1201ac27a0ecSDave Kleikamp } else { 1202ac27a0ecSDave Kleikamp int error2; 1203ac27a0ecSDave Kleikamp 1204617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 1205ac27a0ecSDave Kleikamp value, value_len, flags); 1206617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 1207ac27a0ecSDave Kleikamp if (error == -ENOSPC && 1208617ba13bSMingming Cao ext4_should_retry_alloc(inode->i_sb, &retries)) 1209ac27a0ecSDave Kleikamp goto retry; 1210ac27a0ecSDave Kleikamp if (error == 0) 1211ac27a0ecSDave Kleikamp error = error2; 1212ac27a0ecSDave Kleikamp } 1213ac27a0ecSDave Kleikamp 1214ac27a0ecSDave Kleikamp return error; 1215ac27a0ecSDave Kleikamp } 1216ac27a0ecSDave Kleikamp 1217ac27a0ecSDave Kleikamp /* 12186dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 12196dd4ee7cSKalpak Shah * i_extra_isize. 12206dd4ee7cSKalpak Shah */ 12216dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 12226dd4ee7cSKalpak Shah int value_offs_shift, void *to, 12236dd4ee7cSKalpak Shah void *from, size_t n, int blocksize) 12246dd4ee7cSKalpak Shah { 12256dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 12266dd4ee7cSKalpak Shah int new_offs; 12276dd4ee7cSKalpak Shah 12286dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 12296dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 12306dd4ee7cSKalpak Shah if (!last->e_value_block && last->e_value_size) { 12316dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 12326dd4ee7cSKalpak Shah value_offs_shift; 12336dd4ee7cSKalpak Shah BUG_ON(new_offs + le32_to_cpu(last->e_value_size) 12346dd4ee7cSKalpak Shah > blocksize); 12356dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 12366dd4ee7cSKalpak Shah } 12376dd4ee7cSKalpak Shah } 12386dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 12396dd4ee7cSKalpak Shah memmove(to, from, n); 12406dd4ee7cSKalpak Shah } 12416dd4ee7cSKalpak Shah 12426dd4ee7cSKalpak Shah /* 12436dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 12446dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 12456dd4ee7cSKalpak Shah */ 12466dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 12476dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 12486dd4ee7cSKalpak Shah { 12496dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 12506dd4ee7cSKalpak Shah struct ext4_xattr_entry *entry, *last, *first; 12516dd4ee7cSKalpak Shah struct buffer_head *bh = NULL; 12526dd4ee7cSKalpak Shah struct ext4_xattr_ibody_find *is = NULL; 12536dd4ee7cSKalpak Shah struct ext4_xattr_block_find *bs = NULL; 12546dd4ee7cSKalpak Shah char *buffer = NULL, *b_entry_name = NULL; 12556dd4ee7cSKalpak Shah size_t min_offs, free; 12567b1b2c1bSTheodore Ts'o int total_ino; 12576dd4ee7cSKalpak Shah void *base, *start, *end; 12586dd4ee7cSKalpak Shah int extra_isize = 0, error = 0, tried_min_extra_isize = 0; 1259ac39849dSAneesh Kumar K.V int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); 12606dd4ee7cSKalpak Shah 12616dd4ee7cSKalpak Shah down_write(&EXT4_I(inode)->xattr_sem); 12626dd4ee7cSKalpak Shah retry: 12636dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) { 12646dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 12656dd4ee7cSKalpak Shah return 0; 12666dd4ee7cSKalpak Shah } 12676dd4ee7cSKalpak Shah 12686dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 12696dd4ee7cSKalpak Shah entry = IFIRST(header); 12706dd4ee7cSKalpak Shah 12716dd4ee7cSKalpak Shah /* 12726dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 12736dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 12746dd4ee7cSKalpak Shah */ 12756dd4ee7cSKalpak Shah 12766dd4ee7cSKalpak Shah base = start = entry; 12776dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 12786dd4ee7cSKalpak Shah min_offs = end - base; 12796dd4ee7cSKalpak Shah last = entry; 12806dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 12816dd4ee7cSKalpak Shah 12826dd4ee7cSKalpak Shah free = ext4_xattr_free_space(last, &min_offs, base, &total_ino); 12836dd4ee7cSKalpak Shah if (free >= new_extra_isize) { 12846dd4ee7cSKalpak Shah entry = IFIRST(header); 12856dd4ee7cSKalpak Shah ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize 12866dd4ee7cSKalpak Shah - new_extra_isize, (void *)raw_inode + 12876dd4ee7cSKalpak Shah EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 12886dd4ee7cSKalpak Shah (void *)header, total_ino, 12896dd4ee7cSKalpak Shah inode->i_sb->s_blocksize); 12906dd4ee7cSKalpak Shah EXT4_I(inode)->i_extra_isize = new_extra_isize; 12916dd4ee7cSKalpak Shah error = 0; 12926dd4ee7cSKalpak Shah goto cleanup; 12936dd4ee7cSKalpak Shah } 12946dd4ee7cSKalpak Shah 12956dd4ee7cSKalpak Shah /* 12966dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 12976dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 12986dd4ee7cSKalpak Shah */ 12996dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 13006dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 13016dd4ee7cSKalpak Shah error = -EIO; 13026dd4ee7cSKalpak Shah if (!bh) 13036dd4ee7cSKalpak Shah goto cleanup; 1304cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 130524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 130624676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 13076dd4ee7cSKalpak Shah error = -EIO; 13086dd4ee7cSKalpak Shah goto cleanup; 13096dd4ee7cSKalpak Shah } 13106dd4ee7cSKalpak Shah base = BHDR(bh); 13116dd4ee7cSKalpak Shah first = BFIRST(bh); 13126dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 13136dd4ee7cSKalpak Shah min_offs = end - base; 13147b1b2c1bSTheodore Ts'o free = ext4_xattr_free_space(first, &min_offs, base, NULL); 13156dd4ee7cSKalpak Shah if (free < new_extra_isize) { 13166dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 13176dd4ee7cSKalpak Shah tried_min_extra_isize++; 13186dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 13196dd4ee7cSKalpak Shah brelse(bh); 13206dd4ee7cSKalpak Shah goto retry; 13216dd4ee7cSKalpak Shah } 13226dd4ee7cSKalpak Shah error = -1; 13236dd4ee7cSKalpak Shah goto cleanup; 13246dd4ee7cSKalpak Shah } 13256dd4ee7cSKalpak Shah } else { 13266dd4ee7cSKalpak Shah free = inode->i_sb->s_blocksize; 13276dd4ee7cSKalpak Shah } 13286dd4ee7cSKalpak Shah 13296dd4ee7cSKalpak Shah while (new_extra_isize > 0) { 13306dd4ee7cSKalpak Shah size_t offs, size, entry_size; 13316dd4ee7cSKalpak Shah struct ext4_xattr_entry *small_entry = NULL; 13326dd4ee7cSKalpak Shah struct ext4_xattr_info i = { 13336dd4ee7cSKalpak Shah .value = NULL, 13346dd4ee7cSKalpak Shah .value_len = 0, 13356dd4ee7cSKalpak Shah }; 13366dd4ee7cSKalpak Shah unsigned int total_size; /* EA entry size + value size */ 13376dd4ee7cSKalpak Shah unsigned int shift_bytes; /* No. of bytes to shift EAs by? */ 13386dd4ee7cSKalpak Shah unsigned int min_total_size = ~0U; 13396dd4ee7cSKalpak Shah 13406dd4ee7cSKalpak Shah is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 13416dd4ee7cSKalpak Shah bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 13426dd4ee7cSKalpak Shah if (!is || !bs) { 13436dd4ee7cSKalpak Shah error = -ENOMEM; 13446dd4ee7cSKalpak Shah goto cleanup; 13456dd4ee7cSKalpak Shah } 13466dd4ee7cSKalpak Shah 13476dd4ee7cSKalpak Shah is->s.not_found = -ENODATA; 13486dd4ee7cSKalpak Shah bs->s.not_found = -ENODATA; 13496dd4ee7cSKalpak Shah is->iloc.bh = NULL; 13506dd4ee7cSKalpak Shah bs->bh = NULL; 13516dd4ee7cSKalpak Shah 13526dd4ee7cSKalpak Shah last = IFIRST(header); 13536dd4ee7cSKalpak Shah /* Find the entry best suited to be pushed into EA block */ 13546dd4ee7cSKalpak Shah entry = NULL; 13556dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 13566dd4ee7cSKalpak Shah total_size = 13576dd4ee7cSKalpak Shah EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + 13586dd4ee7cSKalpak Shah EXT4_XATTR_LEN(last->e_name_len); 13596dd4ee7cSKalpak Shah if (total_size <= free && total_size < min_total_size) { 13606dd4ee7cSKalpak Shah if (total_size < new_extra_isize) { 13616dd4ee7cSKalpak Shah small_entry = last; 13626dd4ee7cSKalpak Shah } else { 13636dd4ee7cSKalpak Shah entry = last; 13646dd4ee7cSKalpak Shah min_total_size = total_size; 13656dd4ee7cSKalpak Shah } 13666dd4ee7cSKalpak Shah } 13676dd4ee7cSKalpak Shah } 13686dd4ee7cSKalpak Shah 13696dd4ee7cSKalpak Shah if (entry == NULL) { 13706dd4ee7cSKalpak Shah if (small_entry) { 13716dd4ee7cSKalpak Shah entry = small_entry; 13726dd4ee7cSKalpak Shah } else { 13736dd4ee7cSKalpak Shah if (!tried_min_extra_isize && 13746dd4ee7cSKalpak Shah s_min_extra_isize) { 13756dd4ee7cSKalpak Shah tried_min_extra_isize++; 13766dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 13776e4ea8e3SDave Jones kfree(is); is = NULL; 13786e4ea8e3SDave Jones kfree(bs); bs = NULL; 1379dcb9917bSTheodore Ts'o brelse(bh); 13806dd4ee7cSKalpak Shah goto retry; 13816dd4ee7cSKalpak Shah } 13826dd4ee7cSKalpak Shah error = -1; 13836dd4ee7cSKalpak Shah goto cleanup; 13846dd4ee7cSKalpak Shah } 13856dd4ee7cSKalpak Shah } 13866dd4ee7cSKalpak Shah offs = le16_to_cpu(entry->e_value_offs); 13876dd4ee7cSKalpak Shah size = le32_to_cpu(entry->e_value_size); 13886dd4ee7cSKalpak Shah entry_size = EXT4_XATTR_LEN(entry->e_name_len); 13896dd4ee7cSKalpak Shah i.name_index = entry->e_name_index, 13906dd4ee7cSKalpak Shah buffer = kmalloc(EXT4_XATTR_SIZE(size), GFP_NOFS); 13916dd4ee7cSKalpak Shah b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 13926dd4ee7cSKalpak Shah if (!buffer || !b_entry_name) { 13936dd4ee7cSKalpak Shah error = -ENOMEM; 13946dd4ee7cSKalpak Shah goto cleanup; 13956dd4ee7cSKalpak Shah } 13966dd4ee7cSKalpak Shah /* Save the entry name and the entry value */ 13976dd4ee7cSKalpak Shah memcpy(buffer, (void *)IFIRST(header) + offs, 13986dd4ee7cSKalpak Shah EXT4_XATTR_SIZE(size)); 13996dd4ee7cSKalpak Shah memcpy(b_entry_name, entry->e_name, entry->e_name_len); 14006dd4ee7cSKalpak Shah b_entry_name[entry->e_name_len] = '\0'; 14016dd4ee7cSKalpak Shah i.name = b_entry_name; 14026dd4ee7cSKalpak Shah 14036dd4ee7cSKalpak Shah error = ext4_get_inode_loc(inode, &is->iloc); 14046dd4ee7cSKalpak Shah if (error) 14056dd4ee7cSKalpak Shah goto cleanup; 14066dd4ee7cSKalpak Shah 14076dd4ee7cSKalpak Shah error = ext4_xattr_ibody_find(inode, &i, is); 14086dd4ee7cSKalpak Shah if (error) 14096dd4ee7cSKalpak Shah goto cleanup; 14106dd4ee7cSKalpak Shah 14116dd4ee7cSKalpak Shah /* Remove the chosen entry from the inode */ 14126dd4ee7cSKalpak Shah error = ext4_xattr_ibody_set(handle, inode, &i, is); 14139aaab058SRoel Kluin if (error) 14149aaab058SRoel Kluin goto cleanup; 14156dd4ee7cSKalpak Shah 14166dd4ee7cSKalpak Shah entry = IFIRST(header); 14176dd4ee7cSKalpak Shah if (entry_size + EXT4_XATTR_SIZE(size) >= new_extra_isize) 14186dd4ee7cSKalpak Shah shift_bytes = new_extra_isize; 14196dd4ee7cSKalpak Shah else 14206dd4ee7cSKalpak Shah shift_bytes = entry_size + size; 14216dd4ee7cSKalpak Shah /* Adjust the offsets and shift the remaining entries ahead */ 14226dd4ee7cSKalpak Shah ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize - 14236dd4ee7cSKalpak Shah shift_bytes, (void *)raw_inode + 14246dd4ee7cSKalpak Shah EXT4_GOOD_OLD_INODE_SIZE + extra_isize + shift_bytes, 14256dd4ee7cSKalpak Shah (void *)header, total_ino - entry_size, 14266dd4ee7cSKalpak Shah inode->i_sb->s_blocksize); 14276dd4ee7cSKalpak Shah 14286dd4ee7cSKalpak Shah extra_isize += shift_bytes; 14296dd4ee7cSKalpak Shah new_extra_isize -= shift_bytes; 14306dd4ee7cSKalpak Shah EXT4_I(inode)->i_extra_isize = extra_isize; 14316dd4ee7cSKalpak Shah 14326dd4ee7cSKalpak Shah i.name = b_entry_name; 14336dd4ee7cSKalpak Shah i.value = buffer; 1434ac39849dSAneesh Kumar K.V i.value_len = size; 14356dd4ee7cSKalpak Shah error = ext4_xattr_block_find(inode, &i, bs); 14366dd4ee7cSKalpak Shah if (error) 14376dd4ee7cSKalpak Shah goto cleanup; 14386dd4ee7cSKalpak Shah 14396dd4ee7cSKalpak Shah /* Add entry which was removed from the inode into the block */ 14406dd4ee7cSKalpak Shah error = ext4_xattr_block_set(handle, inode, &i, bs); 14416dd4ee7cSKalpak Shah if (error) 14426dd4ee7cSKalpak Shah goto cleanup; 14436dd4ee7cSKalpak Shah kfree(b_entry_name); 14446dd4ee7cSKalpak Shah kfree(buffer); 1445d3533d72SJulia Lawall b_entry_name = NULL; 1446d3533d72SJulia Lawall buffer = NULL; 14476dd4ee7cSKalpak Shah brelse(is->iloc.bh); 14486dd4ee7cSKalpak Shah kfree(is); 14496dd4ee7cSKalpak Shah kfree(bs); 14506dd4ee7cSKalpak Shah } 14516dd4ee7cSKalpak Shah brelse(bh); 14526dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 14536dd4ee7cSKalpak Shah return 0; 14546dd4ee7cSKalpak Shah 14556dd4ee7cSKalpak Shah cleanup: 14566dd4ee7cSKalpak Shah kfree(b_entry_name); 14576dd4ee7cSKalpak Shah kfree(buffer); 14586dd4ee7cSKalpak Shah if (is) 14596dd4ee7cSKalpak Shah brelse(is->iloc.bh); 14606dd4ee7cSKalpak Shah kfree(is); 14616dd4ee7cSKalpak Shah kfree(bs); 14626dd4ee7cSKalpak Shah brelse(bh); 14636dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 14646dd4ee7cSKalpak Shah return error; 14656dd4ee7cSKalpak Shah } 14666dd4ee7cSKalpak Shah 14676dd4ee7cSKalpak Shah 14686dd4ee7cSKalpak Shah 14696dd4ee7cSKalpak Shah /* 1470617ba13bSMingming Cao * ext4_xattr_delete_inode() 1471ac27a0ecSDave Kleikamp * 1472ac27a0ecSDave Kleikamp * Free extended attribute resources associated with this inode. This 1473ac27a0ecSDave Kleikamp * is called immediately before an inode is freed. We have exclusive 1474ac27a0ecSDave Kleikamp * access to the inode. 1475ac27a0ecSDave Kleikamp */ 1476ac27a0ecSDave Kleikamp void 1477617ba13bSMingming Cao ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) 1478ac27a0ecSDave Kleikamp { 1479ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 1480ac27a0ecSDave Kleikamp 1481617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 1482ac27a0ecSDave Kleikamp goto cleanup; 1483617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 1484ac27a0ecSDave Kleikamp if (!bh) { 148524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 148624676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1487ac27a0ecSDave Kleikamp goto cleanup; 1488ac27a0ecSDave Kleikamp } 1489617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 1490ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) { 149124676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 149224676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1493ac27a0ecSDave Kleikamp goto cleanup; 1494ac27a0ecSDave Kleikamp } 1495617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bh); 1496617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 1497ac27a0ecSDave Kleikamp 1498ac27a0ecSDave Kleikamp cleanup: 1499ac27a0ecSDave Kleikamp brelse(bh); 1500ac27a0ecSDave Kleikamp } 1501ac27a0ecSDave Kleikamp 1502ac27a0ecSDave Kleikamp /* 1503617ba13bSMingming Cao * ext4_xattr_put_super() 1504ac27a0ecSDave Kleikamp * 1505ac27a0ecSDave Kleikamp * This is called when a file system is unmounted. 1506ac27a0ecSDave Kleikamp */ 1507ac27a0ecSDave Kleikamp void 1508617ba13bSMingming Cao ext4_xattr_put_super(struct super_block *sb) 1509ac27a0ecSDave Kleikamp { 1510ac27a0ecSDave Kleikamp mb_cache_shrink(sb->s_bdev); 1511ac27a0ecSDave Kleikamp } 1512ac27a0ecSDave Kleikamp 1513ac27a0ecSDave Kleikamp /* 1514617ba13bSMingming Cao * ext4_xattr_cache_insert() 1515ac27a0ecSDave Kleikamp * 1516ac27a0ecSDave Kleikamp * Create a new entry in the extended attribute cache, and insert 1517ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 1518ac27a0ecSDave Kleikamp * 1519ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1520ac27a0ecSDave Kleikamp */ 1521ac27a0ecSDave Kleikamp static void 15229c191f70ST Makphaibulchoke ext4_xattr_cache_insert(struct mb_cache *ext4_mb_cache, struct buffer_head *bh) 1523ac27a0ecSDave Kleikamp { 1524ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(BHDR(bh)->h_hash); 1525ac27a0ecSDave Kleikamp struct mb_cache_entry *ce; 1526ac27a0ecSDave Kleikamp int error; 1527ac27a0ecSDave Kleikamp 15289c191f70ST Makphaibulchoke ce = mb_cache_entry_alloc(ext4_mb_cache, GFP_NOFS); 1529ac27a0ecSDave Kleikamp if (!ce) { 1530ac27a0ecSDave Kleikamp ea_bdebug(bh, "out of memory"); 1531ac27a0ecSDave Kleikamp return; 1532ac27a0ecSDave Kleikamp } 15332aec7c52SAndreas Gruenbacher error = mb_cache_entry_insert(ce, bh->b_bdev, bh->b_blocknr, hash); 1534ac27a0ecSDave Kleikamp if (error) { 1535ac27a0ecSDave Kleikamp mb_cache_entry_free(ce); 1536ac27a0ecSDave Kleikamp if (error == -EBUSY) { 1537ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 1538ac27a0ecSDave Kleikamp error = 0; 1539ac27a0ecSDave Kleikamp } 1540ac27a0ecSDave Kleikamp } else { 1541ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 1542ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 1543ac27a0ecSDave Kleikamp } 1544ac27a0ecSDave Kleikamp } 1545ac27a0ecSDave Kleikamp 1546ac27a0ecSDave Kleikamp /* 1547617ba13bSMingming Cao * ext4_xattr_cmp() 1548ac27a0ecSDave Kleikamp * 1549ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 1550ac27a0ecSDave Kleikamp * 1551ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 1552ac27a0ecSDave Kleikamp * a negative error number on errors. 1553ac27a0ecSDave Kleikamp */ 1554ac27a0ecSDave Kleikamp static int 1555617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 1556617ba13bSMingming Cao struct ext4_xattr_header *header2) 1557ac27a0ecSDave Kleikamp { 1558617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 1559ac27a0ecSDave Kleikamp 1560ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 1561ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 1562ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 1563ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 1564ac27a0ecSDave Kleikamp return 1; 1565ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 1566ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 1567ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 1568ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 1569ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 1570ac27a0ecSDave Kleikamp return 1; 1571ac27a0ecSDave Kleikamp if (entry1->e_value_block != 0 || entry2->e_value_block != 0) 1572ac27a0ecSDave Kleikamp return -EIO; 1573ac27a0ecSDave Kleikamp if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 1574ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 1575ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 1576ac27a0ecSDave Kleikamp return 1; 1577ac27a0ecSDave Kleikamp 1578617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 1579617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 1580ac27a0ecSDave Kleikamp } 1581ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 1582ac27a0ecSDave Kleikamp return 1; 1583ac27a0ecSDave Kleikamp return 0; 1584ac27a0ecSDave Kleikamp } 1585ac27a0ecSDave Kleikamp 1586ac27a0ecSDave Kleikamp /* 1587617ba13bSMingming Cao * ext4_xattr_cache_find() 1588ac27a0ecSDave Kleikamp * 1589ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 1590ac27a0ecSDave Kleikamp * 1591ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 1592ac27a0ecSDave Kleikamp * not found or an error occurred. 1593ac27a0ecSDave Kleikamp */ 1594ac27a0ecSDave Kleikamp static struct buffer_head * 1595617ba13bSMingming Cao ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, 1596ac27a0ecSDave Kleikamp struct mb_cache_entry **pce) 1597ac27a0ecSDave Kleikamp { 1598ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 1599ac27a0ecSDave Kleikamp struct mb_cache_entry *ce; 16009c191f70ST Makphaibulchoke struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 1601ac27a0ecSDave Kleikamp 1602ac27a0ecSDave Kleikamp if (!header->h_hash) 1603ac27a0ecSDave Kleikamp return NULL; /* never share */ 1604ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 1605ac27a0ecSDave Kleikamp again: 16069c191f70ST Makphaibulchoke ce = mb_cache_entry_find_first(ext4_mb_cache, inode->i_sb->s_bdev, 16072aec7c52SAndreas Gruenbacher hash); 1608ac27a0ecSDave Kleikamp while (ce) { 1609ac27a0ecSDave Kleikamp struct buffer_head *bh; 1610ac27a0ecSDave Kleikamp 1611ac27a0ecSDave Kleikamp if (IS_ERR(ce)) { 1612ac27a0ecSDave Kleikamp if (PTR_ERR(ce) == -EAGAIN) 1613ac27a0ecSDave Kleikamp goto again; 1614ac27a0ecSDave Kleikamp break; 1615ac27a0ecSDave Kleikamp } 1616ac27a0ecSDave Kleikamp bh = sb_bread(inode->i_sb, ce->e_block); 1617ac27a0ecSDave Kleikamp if (!bh) { 161824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 161924676da4STheodore Ts'o (unsigned long) ce->e_block); 1620ac27a0ecSDave Kleikamp } else if (le32_to_cpu(BHDR(bh)->h_refcount) >= 1621617ba13bSMingming Cao EXT4_XATTR_REFCOUNT_MAX) { 1622ac27a0ecSDave Kleikamp ea_idebug(inode, "block %lu refcount %d>=%d", 1623ac27a0ecSDave Kleikamp (unsigned long) ce->e_block, 1624ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount), 1625617ba13bSMingming Cao EXT4_XATTR_REFCOUNT_MAX); 1626617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 1627ac27a0ecSDave Kleikamp *pce = ce; 1628ac27a0ecSDave Kleikamp return bh; 1629ac27a0ecSDave Kleikamp } 1630ac27a0ecSDave Kleikamp brelse(bh); 16312aec7c52SAndreas Gruenbacher ce = mb_cache_entry_find_next(ce, inode->i_sb->s_bdev, hash); 1632ac27a0ecSDave Kleikamp } 1633ac27a0ecSDave Kleikamp return NULL; 1634ac27a0ecSDave Kleikamp } 1635ac27a0ecSDave Kleikamp 1636ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 1637ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 1638ac27a0ecSDave Kleikamp 1639ac27a0ecSDave Kleikamp /* 1640617ba13bSMingming Cao * ext4_xattr_hash_entry() 1641ac27a0ecSDave Kleikamp * 1642ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 1643ac27a0ecSDave Kleikamp */ 1644617ba13bSMingming Cao static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, 1645617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1646ac27a0ecSDave Kleikamp { 1647ac27a0ecSDave Kleikamp __u32 hash = 0; 1648ac27a0ecSDave Kleikamp char *name = entry->e_name; 1649ac27a0ecSDave Kleikamp int n; 1650ac27a0ecSDave Kleikamp 1651ac27a0ecSDave Kleikamp for (n = 0; n < entry->e_name_len; n++) { 1652ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 1653ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 1654ac27a0ecSDave Kleikamp *name++; 1655ac27a0ecSDave Kleikamp } 1656ac27a0ecSDave Kleikamp 1657ac27a0ecSDave Kleikamp if (entry->e_value_block == 0 && entry->e_value_size != 0) { 1658ac27a0ecSDave Kleikamp __le32 *value = (__le32 *)((char *)header + 1659ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs)); 1660ac27a0ecSDave Kleikamp for (n = (le32_to_cpu(entry->e_value_size) + 1661617ba13bSMingming Cao EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { 1662ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 1663ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 1664ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 1665ac27a0ecSDave Kleikamp } 1666ac27a0ecSDave Kleikamp } 1667ac27a0ecSDave Kleikamp entry->e_hash = cpu_to_le32(hash); 1668ac27a0ecSDave Kleikamp } 1669ac27a0ecSDave Kleikamp 1670ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 1671ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 1672ac27a0ecSDave Kleikamp 1673ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 1674ac27a0ecSDave Kleikamp 1675ac27a0ecSDave Kleikamp /* 1676617ba13bSMingming Cao * ext4_xattr_rehash() 1677ac27a0ecSDave Kleikamp * 1678ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 1679ac27a0ecSDave Kleikamp */ 1680617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *header, 1681617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1682ac27a0ecSDave Kleikamp { 1683617ba13bSMingming Cao struct ext4_xattr_entry *here; 1684ac27a0ecSDave Kleikamp __u32 hash = 0; 1685ac27a0ecSDave Kleikamp 1686617ba13bSMingming Cao ext4_xattr_hash_entry(header, entry); 1687ac27a0ecSDave Kleikamp here = ENTRY(header+1); 1688ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 1689ac27a0ecSDave Kleikamp if (!here->e_hash) { 1690ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 1691ac27a0ecSDave Kleikamp hash = 0; 1692ac27a0ecSDave Kleikamp break; 1693ac27a0ecSDave Kleikamp } 1694ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 1695ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 1696ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 1697617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 1698ac27a0ecSDave Kleikamp } 1699ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 1700ac27a0ecSDave Kleikamp } 1701ac27a0ecSDave Kleikamp 1702ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 1703ac27a0ecSDave Kleikamp 17049c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 17059c191f70ST Makphaibulchoke 17069c191f70ST Makphaibulchoke struct mb_cache * 17079c191f70ST Makphaibulchoke ext4_xattr_create_cache(char *name) 1708ac27a0ecSDave Kleikamp { 17099c191f70ST Makphaibulchoke return mb_cache_create(name, HASH_BUCKET_BITS); 1710ac27a0ecSDave Kleikamp } 1711ac27a0ecSDave Kleikamp 17129c191f70ST Makphaibulchoke void ext4_xattr_destroy_cache(struct mb_cache *cache) 1713ac27a0ecSDave Kleikamp { 17149c191f70ST Makphaibulchoke if (cache) 17159c191f70ST Makphaibulchoke mb_cache_destroy(cache); 1716ac27a0ecSDave Kleikamp } 17179c191f70ST Makphaibulchoke 1718