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 372230b8c1aSZhang Zhen if (strlen(name) > 255) 373230b8c1aSZhang Zhen return -ERANGE; 374230b8c1aSZhang 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 519*5d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 520617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 521ed2908f3SAndreas Gruenbacher EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_EXT_ATTR); 522a0375156STheodore Ts'o ext4_handle_dirty_super(handle, sb); 523ac27a0ecSDave Kleikamp } 524ac27a0ecSDave Kleikamp } 525ac27a0ecSDave Kleikamp 526ac27a0ecSDave Kleikamp /* 527ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 528ec4cb1aaSJan Kara * otherwise free the block. 529ac27a0ecSDave Kleikamp */ 530ac27a0ecSDave Kleikamp static void 531617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 532ac27a0ecSDave Kleikamp struct buffer_head *bh) 533ac27a0ecSDave Kleikamp { 534ac27a0ecSDave Kleikamp struct mb_cache_entry *ce = NULL; 5358a2bfdcbSMingming Cao int error = 0; 5369c191f70ST Makphaibulchoke struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 537ac27a0ecSDave Kleikamp 5389c191f70ST Makphaibulchoke ce = mb_cache_entry_get(ext4_mb_cache, bh->b_bdev, bh->b_blocknr); 539*5d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 5408a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 5418a2bfdcbSMingming Cao if (error) 5428a2bfdcbSMingming Cao goto out; 5438a2bfdcbSMingming Cao 5448a2bfdcbSMingming Cao lock_buffer(bh); 545ac27a0ecSDave Kleikamp if (BHDR(bh)->h_refcount == cpu_to_le32(1)) { 546ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 547ac27a0ecSDave Kleikamp if (ce) 548ac27a0ecSDave Kleikamp mb_cache_entry_free(ce); 549ac27a0ecSDave Kleikamp get_bh(bh); 550ec4cb1aaSJan Kara unlock_buffer(bh); 551e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 552e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 553e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 554ac27a0ecSDave Kleikamp } else { 555e8546d06SMarcin Slusarz le32_add_cpu(&BHDR(bh)->h_refcount, -1); 556c1bb05a6SEric Sandeen if (ce) 557c1bb05a6SEric Sandeen mb_cache_entry_release(ce); 558ec4cb1aaSJan Kara /* 559ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 560ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 561ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 562ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 563ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 564ec4cb1aaSJan Kara * call ext4_handle_dirty_xattr_block() with locked buffer as 565ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 566ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 567ec4cb1aaSJan Kara */ 568ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 569ec4cb1aaSJan Kara error = ext4_handle_dirty_xattr_block(handle, inode, 570ec4cb1aaSJan Kara bh); 571c1bb05a6SEric Sandeen unlock_buffer(bh); 572ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 573ec4cb1aaSJan Kara error = ext4_handle_dirty_xattr_block(handle, inode, 574ec4cb1aaSJan Kara bh); 575ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 5760390131bSFrank Mayhar ext4_handle_sync(handle); 5771231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 578ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 579ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 580ac27a0ecSDave Kleikamp } 5818a2bfdcbSMingming Cao out: 5828a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 5838a2bfdcbSMingming Cao return; 584ac27a0ecSDave Kleikamp } 585ac27a0ecSDave Kleikamp 5866dd4ee7cSKalpak Shah /* 5876dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 5886dd4ee7cSKalpak Shah * bytes used by EA entries. 5896dd4ee7cSKalpak Shah */ 5906dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 5916dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 5926dd4ee7cSKalpak Shah { 5936dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 5946dd4ee7cSKalpak Shah if (!last->e_value_block && last->e_value_size) { 5956dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 5966dd4ee7cSKalpak Shah if (offs < *min_offs) 5976dd4ee7cSKalpak Shah *min_offs = offs; 5986dd4ee7cSKalpak Shah } 5997b1b2c1bSTheodore Ts'o if (total) 6007b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 6016dd4ee7cSKalpak Shah } 6026dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 6036dd4ee7cSKalpak Shah } 6046dd4ee7cSKalpak Shah 605ac27a0ecSDave Kleikamp static int 606617ba13bSMingming Cao ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s) 607ac27a0ecSDave Kleikamp { 608617ba13bSMingming Cao struct ext4_xattr_entry *last; 609ac27a0ecSDave Kleikamp size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); 610ac27a0ecSDave Kleikamp 611ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 612ac27a0ecSDave Kleikamp last = s->first; 613617ba13bSMingming Cao for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 614ac27a0ecSDave Kleikamp if (!last->e_value_block && last->e_value_size) { 615ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 616ac27a0ecSDave Kleikamp if (offs < min_offs) 617ac27a0ecSDave Kleikamp min_offs = offs; 618ac27a0ecSDave Kleikamp } 619ac27a0ecSDave Kleikamp } 620ac27a0ecSDave Kleikamp free = min_offs - ((void *)last - s->base) - sizeof(__u32); 621ac27a0ecSDave Kleikamp if (!s->not_found) { 622ac27a0ecSDave Kleikamp if (!s->here->e_value_block && s->here->e_value_size) { 623ac27a0ecSDave Kleikamp size_t size = le32_to_cpu(s->here->e_value_size); 624617ba13bSMingming Cao free += EXT4_XATTR_SIZE(size); 625ac27a0ecSDave Kleikamp } 626617ba13bSMingming Cao free += EXT4_XATTR_LEN(name_len); 627ac27a0ecSDave Kleikamp } 628ac27a0ecSDave Kleikamp if (i->value) { 629617ba13bSMingming Cao if (free < EXT4_XATTR_SIZE(i->value_len) || 630617ba13bSMingming Cao free < EXT4_XATTR_LEN(name_len) + 631617ba13bSMingming Cao EXT4_XATTR_SIZE(i->value_len)) 632ac27a0ecSDave Kleikamp return -ENOSPC; 633ac27a0ecSDave Kleikamp } 634ac27a0ecSDave Kleikamp 635ac27a0ecSDave Kleikamp if (i->value && s->not_found) { 636ac27a0ecSDave Kleikamp /* Insert the new name. */ 637617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 638ac27a0ecSDave Kleikamp size_t rest = (void *)last - (void *)s->here + sizeof(__u32); 639ac27a0ecSDave Kleikamp memmove((void *)s->here + size, s->here, rest); 640ac27a0ecSDave Kleikamp memset(s->here, 0, size); 641ac27a0ecSDave Kleikamp s->here->e_name_index = i->name_index; 642ac27a0ecSDave Kleikamp s->here->e_name_len = name_len; 643ac27a0ecSDave Kleikamp memcpy(s->here->e_name, i->name, name_len); 644ac27a0ecSDave Kleikamp } else { 645ac27a0ecSDave Kleikamp if (!s->here->e_value_block && s->here->e_value_size) { 646ac27a0ecSDave Kleikamp void *first_val = s->base + min_offs; 647ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(s->here->e_value_offs); 648ac27a0ecSDave Kleikamp void *val = s->base + offs; 649617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE( 650ac27a0ecSDave Kleikamp le32_to_cpu(s->here->e_value_size)); 651ac27a0ecSDave Kleikamp 652617ba13bSMingming Cao if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { 653ac27a0ecSDave Kleikamp /* The old and the new value have the same 654ac27a0ecSDave Kleikamp size. Just replace. */ 655ac27a0ecSDave Kleikamp s->here->e_value_size = 656ac27a0ecSDave Kleikamp cpu_to_le32(i->value_len); 657bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 658bd9926e8STheodore Ts'o memset(val, 0, size); 659bd9926e8STheodore Ts'o } else { 660bd9926e8STheodore Ts'o /* Clear pad bytes first. */ 661617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 662bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 663ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 664bd9926e8STheodore Ts'o } 665ac27a0ecSDave Kleikamp return 0; 666ac27a0ecSDave Kleikamp } 667ac27a0ecSDave Kleikamp 668ac27a0ecSDave Kleikamp /* Remove the old value. */ 669ac27a0ecSDave Kleikamp memmove(first_val + size, first_val, val - first_val); 670ac27a0ecSDave Kleikamp memset(first_val, 0, size); 671ac27a0ecSDave Kleikamp s->here->e_value_size = 0; 672ac27a0ecSDave Kleikamp s->here->e_value_offs = 0; 673ac27a0ecSDave Kleikamp min_offs += size; 674ac27a0ecSDave Kleikamp 675ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 676ac27a0ecSDave Kleikamp last = s->first; 677ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 678ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 679ac27a0ecSDave Kleikamp if (!last->e_value_block && 680ac27a0ecSDave Kleikamp last->e_value_size && o < offs) 681ac27a0ecSDave Kleikamp last->e_value_offs = 682ac27a0ecSDave Kleikamp cpu_to_le16(o + size); 683617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 684ac27a0ecSDave Kleikamp } 685ac27a0ecSDave Kleikamp } 686ac27a0ecSDave Kleikamp if (!i->value) { 687ac27a0ecSDave Kleikamp /* Remove the old name. */ 688617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 689ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 690ac27a0ecSDave Kleikamp memmove(s->here, (void *)s->here + size, 691ac27a0ecSDave Kleikamp (void *)last - (void *)s->here + sizeof(__u32)); 692ac27a0ecSDave Kleikamp memset(last, 0, size); 693ac27a0ecSDave Kleikamp } 694ac27a0ecSDave Kleikamp } 695ac27a0ecSDave Kleikamp 696ac27a0ecSDave Kleikamp if (i->value) { 697ac27a0ecSDave Kleikamp /* Insert the new value. */ 698ac27a0ecSDave Kleikamp s->here->e_value_size = cpu_to_le32(i->value_len); 699ac27a0ecSDave Kleikamp if (i->value_len) { 700617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE(i->value_len); 701ac27a0ecSDave Kleikamp void *val = s->base + min_offs - size; 702ac27a0ecSDave Kleikamp s->here->e_value_offs = cpu_to_le16(min_offs - size); 703bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 704bd9926e8STheodore Ts'o memset(val, 0, size); 705bd9926e8STheodore Ts'o } else { 706bd9926e8STheodore Ts'o /* Clear the pad bytes first. */ 707617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 708bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 709ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 710ac27a0ecSDave Kleikamp } 711ac27a0ecSDave Kleikamp } 712bd9926e8STheodore Ts'o } 713ac27a0ecSDave Kleikamp return 0; 714ac27a0ecSDave Kleikamp } 715ac27a0ecSDave Kleikamp 716617ba13bSMingming Cao struct ext4_xattr_block_find { 717617ba13bSMingming Cao struct ext4_xattr_search s; 718ac27a0ecSDave Kleikamp struct buffer_head *bh; 719ac27a0ecSDave Kleikamp }; 720ac27a0ecSDave Kleikamp 721ac27a0ecSDave Kleikamp static int 722617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 723617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 724ac27a0ecSDave Kleikamp { 725ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 726ac27a0ecSDave Kleikamp int error; 727ac27a0ecSDave Kleikamp 728ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 729ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 730ac27a0ecSDave Kleikamp 731617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 732ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 733617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 734ac27a0ecSDave Kleikamp error = -EIO; 735ac27a0ecSDave Kleikamp if (!bs->bh) 736ac27a0ecSDave Kleikamp goto cleanup; 737ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 738ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 739ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 740cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bs->bh)) { 74124676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 74224676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 743ac27a0ecSDave Kleikamp error = -EIO; 744ac27a0ecSDave Kleikamp goto cleanup; 745ac27a0ecSDave Kleikamp } 746ac27a0ecSDave Kleikamp /* Find the named attribute. */ 747ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 748ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 749ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 750ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 751617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 752ac27a0ecSDave Kleikamp i->name, bs->bh->b_size, 1); 753ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 754ac27a0ecSDave Kleikamp goto cleanup; 755ac27a0ecSDave Kleikamp bs->s.not_found = error; 756ac27a0ecSDave Kleikamp } 757ac27a0ecSDave Kleikamp error = 0; 758ac27a0ecSDave Kleikamp 759ac27a0ecSDave Kleikamp cleanup: 760ac27a0ecSDave Kleikamp return error; 761ac27a0ecSDave Kleikamp } 762ac27a0ecSDave Kleikamp 763ac27a0ecSDave Kleikamp static int 764617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 765617ba13bSMingming Cao struct ext4_xattr_info *i, 766617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 767ac27a0ecSDave Kleikamp { 768ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 769ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 770617ba13bSMingming Cao struct ext4_xattr_search *s = &bs->s; 771ac27a0ecSDave Kleikamp struct mb_cache_entry *ce = NULL; 7728a2bfdcbSMingming Cao int error = 0; 7739c191f70ST Makphaibulchoke struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 774ac27a0ecSDave Kleikamp 775617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 776ac27a0ecSDave Kleikamp 777ac27a0ecSDave Kleikamp if (i->value && i->value_len > sb->s_blocksize) 778ac27a0ecSDave Kleikamp return -ENOSPC; 779ac27a0ecSDave Kleikamp if (s->base) { 7809c191f70ST Makphaibulchoke ce = mb_cache_entry_get(ext4_mb_cache, bs->bh->b_bdev, 781ac27a0ecSDave Kleikamp bs->bh->b_blocknr); 782*5d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 7838a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 7848a2bfdcbSMingming Cao if (error) 7858a2bfdcbSMingming Cao goto cleanup; 7868a2bfdcbSMingming Cao lock_buffer(bs->bh); 7878a2bfdcbSMingming Cao 788ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 789ac27a0ecSDave Kleikamp if (ce) { 790ac27a0ecSDave Kleikamp mb_cache_entry_free(ce); 791ac27a0ecSDave Kleikamp ce = NULL; 792ac27a0ecSDave Kleikamp } 793ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 794617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 795ac27a0ecSDave Kleikamp if (!error) { 796ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 797617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), 798ac27a0ecSDave Kleikamp s->here); 7999c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, 8009c191f70ST Makphaibulchoke bs->bh); 801ac27a0ecSDave Kleikamp } 802ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 803ac27a0ecSDave Kleikamp if (error == -EIO) 804ac27a0ecSDave Kleikamp goto bad_block; 805ac27a0ecSDave Kleikamp if (!error) 806cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 8070390131bSFrank Mayhar inode, 808ac27a0ecSDave Kleikamp bs->bh); 809ac27a0ecSDave Kleikamp if (error) 810ac27a0ecSDave Kleikamp goto cleanup; 811ac27a0ecSDave Kleikamp goto inserted; 812ac27a0ecSDave Kleikamp } else { 813ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 814ac27a0ecSDave Kleikamp 8158a2bfdcbSMingming Cao unlock_buffer(bs->bh); 816ac27a0ecSDave Kleikamp if (ce) { 817ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 818ac27a0ecSDave Kleikamp ce = NULL; 819ac27a0ecSDave Kleikamp } 820ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 821216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 822ac27a0ecSDave Kleikamp error = -ENOMEM; 823ac27a0ecSDave Kleikamp if (s->base == NULL) 824ac27a0ecSDave Kleikamp goto cleanup; 825ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 826ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 827ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 828ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 829ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 830ac27a0ecSDave Kleikamp } 831ac27a0ecSDave Kleikamp } else { 832ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 833216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 834ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 835ac27a0ecSDave Kleikamp error = -ENOMEM; 836ac27a0ecSDave Kleikamp if (s->base == NULL) 837ac27a0ecSDave Kleikamp goto cleanup; 838617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 839ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 840ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 841ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 842ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 843ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 844ac27a0ecSDave Kleikamp } 845ac27a0ecSDave Kleikamp 846617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 847ac27a0ecSDave Kleikamp if (error == -EIO) 848ac27a0ecSDave Kleikamp goto bad_block; 849ac27a0ecSDave Kleikamp if (error) 850ac27a0ecSDave Kleikamp goto cleanup; 851ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 852617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), s->here); 853ac27a0ecSDave Kleikamp 854ac27a0ecSDave Kleikamp inserted: 855ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 856617ba13bSMingming Cao new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); 857ac27a0ecSDave Kleikamp if (new_bh) { 858ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 859ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 860ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 861ac27a0ecSDave Kleikamp else { 862ac27a0ecSDave Kleikamp /* The old block is released after updating 863ac27a0ecSDave Kleikamp the inode. */ 8641231b3a1SLukas Czerner error = dquot_alloc_block(inode, 8651231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 8665dd4056dSChristoph Hellwig if (error) 867ac27a0ecSDave Kleikamp goto cleanup; 868*5d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 869617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 870ac27a0ecSDave Kleikamp new_bh); 871ac27a0ecSDave Kleikamp if (error) 872ac27a0ecSDave Kleikamp goto cleanup_dquot; 873ac27a0ecSDave Kleikamp lock_buffer(new_bh); 874e8546d06SMarcin Slusarz le32_add_cpu(&BHDR(new_bh)->h_refcount, 1); 875ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 876ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(new_bh)->h_refcount)); 877ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 878cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 8790390131bSFrank Mayhar inode, 880ac27a0ecSDave Kleikamp new_bh); 881ac27a0ecSDave Kleikamp if (error) 882ac27a0ecSDave Kleikamp goto cleanup_dquot; 883ac27a0ecSDave Kleikamp } 884ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 885ac27a0ecSDave Kleikamp ce = NULL; 886ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 887ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 888ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 889ac27a0ecSDave Kleikamp new_bh = bs->bh; 890ac27a0ecSDave Kleikamp get_bh(new_bh); 891ac27a0ecSDave Kleikamp } else { 892ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 893fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 894fb0a387dSEric Sandeen 895fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 896d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 897fb0a387dSEric Sandeen 898fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 89912e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 900fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 901fb0a387dSEric Sandeen 9026d6a4351SEric Sandeen /* 9036d6a4351SEric Sandeen * take i_data_sem because we will test 9046d6a4351SEric Sandeen * i_delalloc_reserved_flag in ext4_mb_new_blocks 9056d6a4351SEric Sandeen */ 906c8b459f4SLukas Czerner down_read(&EXT4_I(inode)->i_data_sem); 90755f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 90855f020dbSAllison Henderson NULL, &error); 9096d6a4351SEric Sandeen up_read((&EXT4_I(inode)->i_data_sem)); 910ac27a0ecSDave Kleikamp if (error) 911ac27a0ecSDave Kleikamp goto cleanup; 912fb0a387dSEric Sandeen 91312e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 914fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 915fb0a387dSEric Sandeen 916ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 917ace36ad4SJoe Perches (unsigned long long)block); 918ac27a0ecSDave Kleikamp 919ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 920aebf0243SWang Shilong if (unlikely(!new_bh)) { 921860d21e2STheodore Ts'o error = -ENOMEM; 922ac27a0ecSDave Kleikamp getblk_failed: 9237dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 924e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 925ac27a0ecSDave Kleikamp goto cleanup; 926ac27a0ecSDave Kleikamp } 927ac27a0ecSDave Kleikamp lock_buffer(new_bh); 928617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 929ac27a0ecSDave Kleikamp if (error) { 930ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 931860d21e2STheodore Ts'o error = -EIO; 932ac27a0ecSDave Kleikamp goto getblk_failed; 933ac27a0ecSDave Kleikamp } 934ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 935ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 936ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 9379c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, new_bh); 938cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 9390390131bSFrank Mayhar inode, new_bh); 940ac27a0ecSDave Kleikamp if (error) 941ac27a0ecSDave Kleikamp goto cleanup; 942ac27a0ecSDave Kleikamp } 943ac27a0ecSDave Kleikamp } 944ac27a0ecSDave Kleikamp 945ac27a0ecSDave Kleikamp /* Update the inode. */ 946617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 947ac27a0ecSDave Kleikamp 948ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 949ac27a0ecSDave Kleikamp if (bs->bh && bs->bh != new_bh) 950617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bs->bh); 951ac27a0ecSDave Kleikamp error = 0; 952ac27a0ecSDave Kleikamp 953ac27a0ecSDave Kleikamp cleanup: 954ac27a0ecSDave Kleikamp if (ce) 955ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 956ac27a0ecSDave Kleikamp brelse(new_bh); 957ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 958ac27a0ecSDave Kleikamp kfree(s->base); 959ac27a0ecSDave Kleikamp 960ac27a0ecSDave Kleikamp return error; 961ac27a0ecSDave Kleikamp 962ac27a0ecSDave Kleikamp cleanup_dquot: 9631231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 964ac27a0ecSDave Kleikamp goto cleanup; 965ac27a0ecSDave Kleikamp 966ac27a0ecSDave Kleikamp bad_block: 96724676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 96824676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 969ac27a0ecSDave Kleikamp goto cleanup; 970ac27a0ecSDave Kleikamp 971ac27a0ecSDave Kleikamp #undef header 972ac27a0ecSDave Kleikamp } 973ac27a0ecSDave Kleikamp 974879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 975617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 976ac27a0ecSDave Kleikamp { 977617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 978617ba13bSMingming Cao struct ext4_inode *raw_inode; 979ac27a0ecSDave Kleikamp int error; 980ac27a0ecSDave Kleikamp 981617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 982ac27a0ecSDave Kleikamp return 0; 983617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 984ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 985ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 986ac27a0ecSDave Kleikamp is->s.here = is->s.first; 987617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 98819f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 989617ba13bSMingming Cao error = ext4_xattr_check_names(IFIRST(header), is->s.end); 990ac27a0ecSDave Kleikamp if (error) 991ac27a0ecSDave Kleikamp return error; 992ac27a0ecSDave Kleikamp /* Find the named attribute. */ 993617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 994ac27a0ecSDave Kleikamp i->name, is->s.end - 995ac27a0ecSDave Kleikamp (void *)is->s.base, 0); 996ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 997ac27a0ecSDave Kleikamp return error; 998ac27a0ecSDave Kleikamp is->s.not_found = error; 999ac27a0ecSDave Kleikamp } 1000ac27a0ecSDave Kleikamp return 0; 1001ac27a0ecSDave Kleikamp } 1002ac27a0ecSDave Kleikamp 10030d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 10040d812f77STao Ma struct ext4_xattr_info *i, 10050d812f77STao Ma struct ext4_xattr_ibody_find *is) 10060d812f77STao Ma { 10070d812f77STao Ma struct ext4_xattr_ibody_header *header; 10080d812f77STao Ma struct ext4_xattr_search *s = &is->s; 10090d812f77STao Ma int error; 10100d812f77STao Ma 10110d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 10120d812f77STao Ma return -ENOSPC; 10130d812f77STao Ma error = ext4_xattr_set_entry(i, s); 10140d812f77STao Ma if (error) { 10150d812f77STao Ma if (error == -ENOSPC && 10160d812f77STao Ma ext4_has_inline_data(inode)) { 10170d812f77STao Ma error = ext4_try_to_evict_inline_data(handle, inode, 10180d812f77STao Ma EXT4_XATTR_LEN(strlen(i->name) + 10190d812f77STao Ma EXT4_XATTR_SIZE(i->value_len))); 10200d812f77STao Ma if (error) 10210d812f77STao Ma return error; 10220d812f77STao Ma error = ext4_xattr_ibody_find(inode, i, is); 10230d812f77STao Ma if (error) 10240d812f77STao Ma return error; 10250d812f77STao Ma error = ext4_xattr_set_entry(i, s); 10260d812f77STao Ma } 10270d812f77STao Ma if (error) 10280d812f77STao Ma return error; 10290d812f77STao Ma } 10300d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 10310d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 10320d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 10330d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 10340d812f77STao Ma } else { 10350d812f77STao Ma header->h_magic = cpu_to_le32(0); 10360d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 10370d812f77STao Ma } 10380d812f77STao Ma return 0; 10390d812f77STao Ma } 10400d812f77STao Ma 10410d812f77STao Ma static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 1042617ba13bSMingming Cao struct ext4_xattr_info *i, 1043617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 1044ac27a0ecSDave Kleikamp { 1045617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 1046617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 1047ac27a0ecSDave Kleikamp int error; 1048ac27a0ecSDave Kleikamp 1049617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 1050ac27a0ecSDave Kleikamp return -ENOSPC; 1051617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 1052ac27a0ecSDave Kleikamp if (error) 1053ac27a0ecSDave Kleikamp return error; 1054617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 1055ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 1056617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 105719f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 1058ac27a0ecSDave Kleikamp } else { 1059ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 106019f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 1061ac27a0ecSDave Kleikamp } 1062ac27a0ecSDave Kleikamp return 0; 1063ac27a0ecSDave Kleikamp } 1064ac27a0ecSDave Kleikamp 1065ac27a0ecSDave Kleikamp /* 1066617ba13bSMingming Cao * ext4_xattr_set_handle() 1067ac27a0ecSDave Kleikamp * 10686e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 1069ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 1070ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 1071ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 1072ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 1073ac27a0ecSDave Kleikamp * previous to the call, respectively. 1074ac27a0ecSDave Kleikamp * 1075ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1076ac27a0ecSDave Kleikamp */ 1077ac27a0ecSDave Kleikamp int 1078617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 1079ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 1080ac27a0ecSDave Kleikamp int flags) 1081ac27a0ecSDave Kleikamp { 1082617ba13bSMingming Cao struct ext4_xattr_info i = { 1083ac27a0ecSDave Kleikamp .name_index = name_index, 1084ac27a0ecSDave Kleikamp .name = name, 1085ac27a0ecSDave Kleikamp .value = value, 1086ac27a0ecSDave Kleikamp .value_len = value_len, 1087ac27a0ecSDave Kleikamp 1088ac27a0ecSDave Kleikamp }; 1089617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 1090ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1091ac27a0ecSDave Kleikamp }; 1092617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 1093ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1094ac27a0ecSDave Kleikamp }; 10954d20c685SKalpak Shah unsigned long no_expand; 1096ac27a0ecSDave Kleikamp int error; 1097ac27a0ecSDave Kleikamp 1098ac27a0ecSDave Kleikamp if (!name) 1099ac27a0ecSDave Kleikamp return -EINVAL; 1100ac27a0ecSDave Kleikamp if (strlen(name) > 255) 1101ac27a0ecSDave Kleikamp return -ERANGE; 1102617ba13bSMingming Cao down_write(&EXT4_I(inode)->xattr_sem); 110319f5fb7aSTheodore Ts'o no_expand = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND); 110419f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND); 11054d20c685SKalpak Shah 110666543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 110786ebfd08SEric Sandeen if (error) 110886ebfd08SEric Sandeen goto cleanup; 110986ebfd08SEric Sandeen 111019f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 1111617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 1112617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 111319f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 1114ac27a0ecSDave Kleikamp } 1115ac27a0ecSDave Kleikamp 1116617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 1117ac27a0ecSDave Kleikamp if (error) 1118ac27a0ecSDave Kleikamp goto cleanup; 1119ac27a0ecSDave Kleikamp if (is.s.not_found) 1120617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 1121ac27a0ecSDave Kleikamp if (error) 1122ac27a0ecSDave Kleikamp goto cleanup; 1123ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 1124ac27a0ecSDave Kleikamp error = -ENODATA; 1125ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 1126ac27a0ecSDave Kleikamp goto cleanup; 1127ac27a0ecSDave Kleikamp error = 0; 1128ac27a0ecSDave Kleikamp if (!value) 1129ac27a0ecSDave Kleikamp goto cleanup; 1130ac27a0ecSDave Kleikamp } else { 1131ac27a0ecSDave Kleikamp error = -EEXIST; 1132ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 1133ac27a0ecSDave Kleikamp goto cleanup; 1134ac27a0ecSDave Kleikamp } 1135ac27a0ecSDave Kleikamp if (!value) { 1136ac27a0ecSDave Kleikamp if (!is.s.not_found) 1137617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1138ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 1139617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1140ac27a0ecSDave Kleikamp } else { 1141617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1142ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 1143ac27a0ecSDave Kleikamp i.value = NULL; 1144617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1145ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 11467e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 11477e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 11487e01c8e5STiger Yang if (error) 11497e01c8e5STiger Yang goto cleanup; 11507e01c8e5STiger Yang } 1151617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1152ac27a0ecSDave Kleikamp if (error) 1153ac27a0ecSDave Kleikamp goto cleanup; 1154ac27a0ecSDave Kleikamp if (!is.s.not_found) { 1155ac27a0ecSDave Kleikamp i.value = NULL; 1156617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, 1157ac27a0ecSDave Kleikamp &is); 1158ac27a0ecSDave Kleikamp } 1159ac27a0ecSDave Kleikamp } 1160ac27a0ecSDave Kleikamp } 1161ac27a0ecSDave Kleikamp if (!error) { 1162617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 1163ef7f3835SKalpak Shah inode->i_ctime = ext4_current_time(inode); 11646dd4ee7cSKalpak Shah if (!value) 116519f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); 1166617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 1167ac27a0ecSDave Kleikamp /* 1168617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 1169ac27a0ecSDave Kleikamp * error != 0. 1170ac27a0ecSDave Kleikamp */ 1171ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 1172ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 11730390131bSFrank Mayhar ext4_handle_sync(handle); 1174ac27a0ecSDave Kleikamp } 1175ac27a0ecSDave Kleikamp 1176ac27a0ecSDave Kleikamp cleanup: 1177ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 1178ac27a0ecSDave Kleikamp brelse(bs.bh); 11794d20c685SKalpak Shah if (no_expand == 0) 118019f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); 1181617ba13bSMingming Cao up_write(&EXT4_I(inode)->xattr_sem); 1182ac27a0ecSDave Kleikamp return error; 1183ac27a0ecSDave Kleikamp } 1184ac27a0ecSDave Kleikamp 1185ac27a0ecSDave Kleikamp /* 1186617ba13bSMingming Cao * ext4_xattr_set() 1187ac27a0ecSDave Kleikamp * 1188617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 1189ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 1190ac27a0ecSDave Kleikamp * 1191ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1192ac27a0ecSDave Kleikamp */ 1193ac27a0ecSDave Kleikamp int 1194617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 1195ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 1196ac27a0ecSDave Kleikamp { 1197ac27a0ecSDave Kleikamp handle_t *handle; 1198ac27a0ecSDave Kleikamp int error, retries = 0; 119995eaefbdSTheodore Ts'o int credits = ext4_jbd2_credits_xattr(inode); 1200ac27a0ecSDave Kleikamp 1201ac27a0ecSDave Kleikamp retry: 12029924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 1203ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 1204ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 1205ac27a0ecSDave Kleikamp } else { 1206ac27a0ecSDave Kleikamp int error2; 1207ac27a0ecSDave Kleikamp 1208617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 1209ac27a0ecSDave Kleikamp value, value_len, flags); 1210617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 1211ac27a0ecSDave Kleikamp if (error == -ENOSPC && 1212617ba13bSMingming Cao ext4_should_retry_alloc(inode->i_sb, &retries)) 1213ac27a0ecSDave Kleikamp goto retry; 1214ac27a0ecSDave Kleikamp if (error == 0) 1215ac27a0ecSDave Kleikamp error = error2; 1216ac27a0ecSDave Kleikamp } 1217ac27a0ecSDave Kleikamp 1218ac27a0ecSDave Kleikamp return error; 1219ac27a0ecSDave Kleikamp } 1220ac27a0ecSDave Kleikamp 1221ac27a0ecSDave Kleikamp /* 12226dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 12236dd4ee7cSKalpak Shah * i_extra_isize. 12246dd4ee7cSKalpak Shah */ 12256dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 12266dd4ee7cSKalpak Shah int value_offs_shift, void *to, 12276dd4ee7cSKalpak Shah void *from, size_t n, int blocksize) 12286dd4ee7cSKalpak Shah { 12296dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 12306dd4ee7cSKalpak Shah int new_offs; 12316dd4ee7cSKalpak Shah 12326dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 12336dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 12346dd4ee7cSKalpak Shah if (!last->e_value_block && last->e_value_size) { 12356dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 12366dd4ee7cSKalpak Shah value_offs_shift; 12376dd4ee7cSKalpak Shah BUG_ON(new_offs + le32_to_cpu(last->e_value_size) 12386dd4ee7cSKalpak Shah > blocksize); 12396dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 12406dd4ee7cSKalpak Shah } 12416dd4ee7cSKalpak Shah } 12426dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 12436dd4ee7cSKalpak Shah memmove(to, from, n); 12446dd4ee7cSKalpak Shah } 12456dd4ee7cSKalpak Shah 12466dd4ee7cSKalpak Shah /* 12476dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 12486dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 12496dd4ee7cSKalpak Shah */ 12506dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 12516dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 12526dd4ee7cSKalpak Shah { 12536dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 12546dd4ee7cSKalpak Shah struct ext4_xattr_entry *entry, *last, *first; 12556dd4ee7cSKalpak Shah struct buffer_head *bh = NULL; 12566dd4ee7cSKalpak Shah struct ext4_xattr_ibody_find *is = NULL; 12576dd4ee7cSKalpak Shah struct ext4_xattr_block_find *bs = NULL; 12586dd4ee7cSKalpak Shah char *buffer = NULL, *b_entry_name = NULL; 12596dd4ee7cSKalpak Shah size_t min_offs, free; 12607b1b2c1bSTheodore Ts'o int total_ino; 12616dd4ee7cSKalpak Shah void *base, *start, *end; 12626dd4ee7cSKalpak Shah int extra_isize = 0, error = 0, tried_min_extra_isize = 0; 1263ac39849dSAneesh Kumar K.V int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); 12646dd4ee7cSKalpak Shah 12656dd4ee7cSKalpak Shah down_write(&EXT4_I(inode)->xattr_sem); 12666dd4ee7cSKalpak Shah retry: 12676dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) { 12686dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 12696dd4ee7cSKalpak Shah return 0; 12706dd4ee7cSKalpak Shah } 12716dd4ee7cSKalpak Shah 12726dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 12736dd4ee7cSKalpak Shah entry = IFIRST(header); 12746dd4ee7cSKalpak Shah 12756dd4ee7cSKalpak Shah /* 12766dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 12776dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 12786dd4ee7cSKalpak Shah */ 12796dd4ee7cSKalpak Shah 12806dd4ee7cSKalpak Shah base = start = entry; 12816dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 12826dd4ee7cSKalpak Shah min_offs = end - base; 12836dd4ee7cSKalpak Shah last = entry; 12846dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 12856dd4ee7cSKalpak Shah 12866dd4ee7cSKalpak Shah free = ext4_xattr_free_space(last, &min_offs, base, &total_ino); 12876dd4ee7cSKalpak Shah if (free >= new_extra_isize) { 12886dd4ee7cSKalpak Shah entry = IFIRST(header); 12896dd4ee7cSKalpak Shah ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize 12906dd4ee7cSKalpak Shah - new_extra_isize, (void *)raw_inode + 12916dd4ee7cSKalpak Shah EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 12926dd4ee7cSKalpak Shah (void *)header, total_ino, 12936dd4ee7cSKalpak Shah inode->i_sb->s_blocksize); 12946dd4ee7cSKalpak Shah EXT4_I(inode)->i_extra_isize = new_extra_isize; 12956dd4ee7cSKalpak Shah error = 0; 12966dd4ee7cSKalpak Shah goto cleanup; 12976dd4ee7cSKalpak Shah } 12986dd4ee7cSKalpak Shah 12996dd4ee7cSKalpak Shah /* 13006dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 13016dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 13026dd4ee7cSKalpak Shah */ 13036dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 13046dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 13056dd4ee7cSKalpak Shah error = -EIO; 13066dd4ee7cSKalpak Shah if (!bh) 13076dd4ee7cSKalpak Shah goto cleanup; 1308cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 130924676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 131024676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 13116dd4ee7cSKalpak Shah error = -EIO; 13126dd4ee7cSKalpak Shah goto cleanup; 13136dd4ee7cSKalpak Shah } 13146dd4ee7cSKalpak Shah base = BHDR(bh); 13156dd4ee7cSKalpak Shah first = BFIRST(bh); 13166dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 13176dd4ee7cSKalpak Shah min_offs = end - base; 13187b1b2c1bSTheodore Ts'o free = ext4_xattr_free_space(first, &min_offs, base, NULL); 13196dd4ee7cSKalpak Shah if (free < new_extra_isize) { 13206dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 13216dd4ee7cSKalpak Shah tried_min_extra_isize++; 13226dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 13236dd4ee7cSKalpak Shah brelse(bh); 13246dd4ee7cSKalpak Shah goto retry; 13256dd4ee7cSKalpak Shah } 13266dd4ee7cSKalpak Shah error = -1; 13276dd4ee7cSKalpak Shah goto cleanup; 13286dd4ee7cSKalpak Shah } 13296dd4ee7cSKalpak Shah } else { 13306dd4ee7cSKalpak Shah free = inode->i_sb->s_blocksize; 13316dd4ee7cSKalpak Shah } 13326dd4ee7cSKalpak Shah 13336dd4ee7cSKalpak Shah while (new_extra_isize > 0) { 13346dd4ee7cSKalpak Shah size_t offs, size, entry_size; 13356dd4ee7cSKalpak Shah struct ext4_xattr_entry *small_entry = NULL; 13366dd4ee7cSKalpak Shah struct ext4_xattr_info i = { 13376dd4ee7cSKalpak Shah .value = NULL, 13386dd4ee7cSKalpak Shah .value_len = 0, 13396dd4ee7cSKalpak Shah }; 13406dd4ee7cSKalpak Shah unsigned int total_size; /* EA entry size + value size */ 13416dd4ee7cSKalpak Shah unsigned int shift_bytes; /* No. of bytes to shift EAs by? */ 13426dd4ee7cSKalpak Shah unsigned int min_total_size = ~0U; 13436dd4ee7cSKalpak Shah 13446dd4ee7cSKalpak Shah is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 13456dd4ee7cSKalpak Shah bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 13466dd4ee7cSKalpak Shah if (!is || !bs) { 13476dd4ee7cSKalpak Shah error = -ENOMEM; 13486dd4ee7cSKalpak Shah goto cleanup; 13496dd4ee7cSKalpak Shah } 13506dd4ee7cSKalpak Shah 13516dd4ee7cSKalpak Shah is->s.not_found = -ENODATA; 13526dd4ee7cSKalpak Shah bs->s.not_found = -ENODATA; 13536dd4ee7cSKalpak Shah is->iloc.bh = NULL; 13546dd4ee7cSKalpak Shah bs->bh = NULL; 13556dd4ee7cSKalpak Shah 13566dd4ee7cSKalpak Shah last = IFIRST(header); 13576dd4ee7cSKalpak Shah /* Find the entry best suited to be pushed into EA block */ 13586dd4ee7cSKalpak Shah entry = NULL; 13596dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 13606dd4ee7cSKalpak Shah total_size = 13616dd4ee7cSKalpak Shah EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + 13626dd4ee7cSKalpak Shah EXT4_XATTR_LEN(last->e_name_len); 13636dd4ee7cSKalpak Shah if (total_size <= free && total_size < min_total_size) { 13646dd4ee7cSKalpak Shah if (total_size < new_extra_isize) { 13656dd4ee7cSKalpak Shah small_entry = last; 13666dd4ee7cSKalpak Shah } else { 13676dd4ee7cSKalpak Shah entry = last; 13686dd4ee7cSKalpak Shah min_total_size = total_size; 13696dd4ee7cSKalpak Shah } 13706dd4ee7cSKalpak Shah } 13716dd4ee7cSKalpak Shah } 13726dd4ee7cSKalpak Shah 13736dd4ee7cSKalpak Shah if (entry == NULL) { 13746dd4ee7cSKalpak Shah if (small_entry) { 13756dd4ee7cSKalpak Shah entry = small_entry; 13766dd4ee7cSKalpak Shah } else { 13776dd4ee7cSKalpak Shah if (!tried_min_extra_isize && 13786dd4ee7cSKalpak Shah s_min_extra_isize) { 13796dd4ee7cSKalpak Shah tried_min_extra_isize++; 13806dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 13816e4ea8e3SDave Jones kfree(is); is = NULL; 13826e4ea8e3SDave Jones kfree(bs); bs = NULL; 1383dcb9917bSTheodore Ts'o brelse(bh); 13846dd4ee7cSKalpak Shah goto retry; 13856dd4ee7cSKalpak Shah } 13866dd4ee7cSKalpak Shah error = -1; 13876dd4ee7cSKalpak Shah goto cleanup; 13886dd4ee7cSKalpak Shah } 13896dd4ee7cSKalpak Shah } 13906dd4ee7cSKalpak Shah offs = le16_to_cpu(entry->e_value_offs); 13916dd4ee7cSKalpak Shah size = le32_to_cpu(entry->e_value_size); 13926dd4ee7cSKalpak Shah entry_size = EXT4_XATTR_LEN(entry->e_name_len); 13936dd4ee7cSKalpak Shah i.name_index = entry->e_name_index, 13946dd4ee7cSKalpak Shah buffer = kmalloc(EXT4_XATTR_SIZE(size), GFP_NOFS); 13956dd4ee7cSKalpak Shah b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 13966dd4ee7cSKalpak Shah if (!buffer || !b_entry_name) { 13976dd4ee7cSKalpak Shah error = -ENOMEM; 13986dd4ee7cSKalpak Shah goto cleanup; 13996dd4ee7cSKalpak Shah } 14006dd4ee7cSKalpak Shah /* Save the entry name and the entry value */ 14016dd4ee7cSKalpak Shah memcpy(buffer, (void *)IFIRST(header) + offs, 14026dd4ee7cSKalpak Shah EXT4_XATTR_SIZE(size)); 14036dd4ee7cSKalpak Shah memcpy(b_entry_name, entry->e_name, entry->e_name_len); 14046dd4ee7cSKalpak Shah b_entry_name[entry->e_name_len] = '\0'; 14056dd4ee7cSKalpak Shah i.name = b_entry_name; 14066dd4ee7cSKalpak Shah 14076dd4ee7cSKalpak Shah error = ext4_get_inode_loc(inode, &is->iloc); 14086dd4ee7cSKalpak Shah if (error) 14096dd4ee7cSKalpak Shah goto cleanup; 14106dd4ee7cSKalpak Shah 14116dd4ee7cSKalpak Shah error = ext4_xattr_ibody_find(inode, &i, is); 14126dd4ee7cSKalpak Shah if (error) 14136dd4ee7cSKalpak Shah goto cleanup; 14146dd4ee7cSKalpak Shah 14156dd4ee7cSKalpak Shah /* Remove the chosen entry from the inode */ 14166dd4ee7cSKalpak Shah error = ext4_xattr_ibody_set(handle, inode, &i, is); 14179aaab058SRoel Kluin if (error) 14189aaab058SRoel Kluin goto cleanup; 14196dd4ee7cSKalpak Shah 14206dd4ee7cSKalpak Shah entry = IFIRST(header); 14216dd4ee7cSKalpak Shah if (entry_size + EXT4_XATTR_SIZE(size) >= new_extra_isize) 14226dd4ee7cSKalpak Shah shift_bytes = new_extra_isize; 14236dd4ee7cSKalpak Shah else 14246dd4ee7cSKalpak Shah shift_bytes = entry_size + size; 14256dd4ee7cSKalpak Shah /* Adjust the offsets and shift the remaining entries ahead */ 14266dd4ee7cSKalpak Shah ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize - 14276dd4ee7cSKalpak Shah shift_bytes, (void *)raw_inode + 14286dd4ee7cSKalpak Shah EXT4_GOOD_OLD_INODE_SIZE + extra_isize + shift_bytes, 14296dd4ee7cSKalpak Shah (void *)header, total_ino - entry_size, 14306dd4ee7cSKalpak Shah inode->i_sb->s_blocksize); 14316dd4ee7cSKalpak Shah 14326dd4ee7cSKalpak Shah extra_isize += shift_bytes; 14336dd4ee7cSKalpak Shah new_extra_isize -= shift_bytes; 14346dd4ee7cSKalpak Shah EXT4_I(inode)->i_extra_isize = extra_isize; 14356dd4ee7cSKalpak Shah 14366dd4ee7cSKalpak Shah i.name = b_entry_name; 14376dd4ee7cSKalpak Shah i.value = buffer; 1438ac39849dSAneesh Kumar K.V i.value_len = size; 14396dd4ee7cSKalpak Shah error = ext4_xattr_block_find(inode, &i, bs); 14406dd4ee7cSKalpak Shah if (error) 14416dd4ee7cSKalpak Shah goto cleanup; 14426dd4ee7cSKalpak Shah 14436dd4ee7cSKalpak Shah /* Add entry which was removed from the inode into the block */ 14446dd4ee7cSKalpak Shah error = ext4_xattr_block_set(handle, inode, &i, bs); 14456dd4ee7cSKalpak Shah if (error) 14466dd4ee7cSKalpak Shah goto cleanup; 14476dd4ee7cSKalpak Shah kfree(b_entry_name); 14486dd4ee7cSKalpak Shah kfree(buffer); 1449d3533d72SJulia Lawall b_entry_name = NULL; 1450d3533d72SJulia Lawall buffer = NULL; 14516dd4ee7cSKalpak Shah brelse(is->iloc.bh); 14526dd4ee7cSKalpak Shah kfree(is); 14536dd4ee7cSKalpak Shah kfree(bs); 14546dd4ee7cSKalpak Shah } 14556dd4ee7cSKalpak Shah brelse(bh); 14566dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 14576dd4ee7cSKalpak Shah return 0; 14586dd4ee7cSKalpak Shah 14596dd4ee7cSKalpak Shah cleanup: 14606dd4ee7cSKalpak Shah kfree(b_entry_name); 14616dd4ee7cSKalpak Shah kfree(buffer); 14626dd4ee7cSKalpak Shah if (is) 14636dd4ee7cSKalpak Shah brelse(is->iloc.bh); 14646dd4ee7cSKalpak Shah kfree(is); 14656dd4ee7cSKalpak Shah kfree(bs); 14666dd4ee7cSKalpak Shah brelse(bh); 14676dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 14686dd4ee7cSKalpak Shah return error; 14696dd4ee7cSKalpak Shah } 14706dd4ee7cSKalpak Shah 14716dd4ee7cSKalpak Shah 14726dd4ee7cSKalpak Shah 14736dd4ee7cSKalpak Shah /* 1474617ba13bSMingming Cao * ext4_xattr_delete_inode() 1475ac27a0ecSDave Kleikamp * 1476ac27a0ecSDave Kleikamp * Free extended attribute resources associated with this inode. This 1477ac27a0ecSDave Kleikamp * is called immediately before an inode is freed. We have exclusive 1478ac27a0ecSDave Kleikamp * access to the inode. 1479ac27a0ecSDave Kleikamp */ 1480ac27a0ecSDave Kleikamp void 1481617ba13bSMingming Cao ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) 1482ac27a0ecSDave Kleikamp { 1483ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 1484ac27a0ecSDave Kleikamp 1485617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 1486ac27a0ecSDave Kleikamp goto cleanup; 1487617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 1488ac27a0ecSDave Kleikamp if (!bh) { 148924676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 149024676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1491ac27a0ecSDave Kleikamp goto cleanup; 1492ac27a0ecSDave Kleikamp } 1493617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 1494ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) { 149524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 149624676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1497ac27a0ecSDave Kleikamp goto cleanup; 1498ac27a0ecSDave Kleikamp } 1499617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bh); 1500617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 1501ac27a0ecSDave Kleikamp 1502ac27a0ecSDave Kleikamp cleanup: 1503ac27a0ecSDave Kleikamp brelse(bh); 1504ac27a0ecSDave Kleikamp } 1505ac27a0ecSDave Kleikamp 1506ac27a0ecSDave Kleikamp /* 1507617ba13bSMingming Cao * ext4_xattr_put_super() 1508ac27a0ecSDave Kleikamp * 1509ac27a0ecSDave Kleikamp * This is called when a file system is unmounted. 1510ac27a0ecSDave Kleikamp */ 1511ac27a0ecSDave Kleikamp void 1512617ba13bSMingming Cao ext4_xattr_put_super(struct super_block *sb) 1513ac27a0ecSDave Kleikamp { 1514ac27a0ecSDave Kleikamp mb_cache_shrink(sb->s_bdev); 1515ac27a0ecSDave Kleikamp } 1516ac27a0ecSDave Kleikamp 1517ac27a0ecSDave Kleikamp /* 1518617ba13bSMingming Cao * ext4_xattr_cache_insert() 1519ac27a0ecSDave Kleikamp * 1520ac27a0ecSDave Kleikamp * Create a new entry in the extended attribute cache, and insert 1521ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 1522ac27a0ecSDave Kleikamp * 1523ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1524ac27a0ecSDave Kleikamp */ 1525ac27a0ecSDave Kleikamp static void 15269c191f70ST Makphaibulchoke ext4_xattr_cache_insert(struct mb_cache *ext4_mb_cache, struct buffer_head *bh) 1527ac27a0ecSDave Kleikamp { 1528ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(BHDR(bh)->h_hash); 1529ac27a0ecSDave Kleikamp struct mb_cache_entry *ce; 1530ac27a0ecSDave Kleikamp int error; 1531ac27a0ecSDave Kleikamp 15329c191f70ST Makphaibulchoke ce = mb_cache_entry_alloc(ext4_mb_cache, GFP_NOFS); 1533ac27a0ecSDave Kleikamp if (!ce) { 1534ac27a0ecSDave Kleikamp ea_bdebug(bh, "out of memory"); 1535ac27a0ecSDave Kleikamp return; 1536ac27a0ecSDave Kleikamp } 15372aec7c52SAndreas Gruenbacher error = mb_cache_entry_insert(ce, bh->b_bdev, bh->b_blocknr, hash); 1538ac27a0ecSDave Kleikamp if (error) { 1539ac27a0ecSDave Kleikamp mb_cache_entry_free(ce); 1540ac27a0ecSDave Kleikamp if (error == -EBUSY) { 1541ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 1542ac27a0ecSDave Kleikamp error = 0; 1543ac27a0ecSDave Kleikamp } 1544ac27a0ecSDave Kleikamp } else { 1545ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 1546ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 1547ac27a0ecSDave Kleikamp } 1548ac27a0ecSDave Kleikamp } 1549ac27a0ecSDave Kleikamp 1550ac27a0ecSDave Kleikamp /* 1551617ba13bSMingming Cao * ext4_xattr_cmp() 1552ac27a0ecSDave Kleikamp * 1553ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 1554ac27a0ecSDave Kleikamp * 1555ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 1556ac27a0ecSDave Kleikamp * a negative error number on errors. 1557ac27a0ecSDave Kleikamp */ 1558ac27a0ecSDave Kleikamp static int 1559617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 1560617ba13bSMingming Cao struct ext4_xattr_header *header2) 1561ac27a0ecSDave Kleikamp { 1562617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 1563ac27a0ecSDave Kleikamp 1564ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 1565ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 1566ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 1567ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 1568ac27a0ecSDave Kleikamp return 1; 1569ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 1570ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 1571ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 1572ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 1573ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 1574ac27a0ecSDave Kleikamp return 1; 1575ac27a0ecSDave Kleikamp if (entry1->e_value_block != 0 || entry2->e_value_block != 0) 1576ac27a0ecSDave Kleikamp return -EIO; 1577ac27a0ecSDave Kleikamp if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 1578ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 1579ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 1580ac27a0ecSDave Kleikamp return 1; 1581ac27a0ecSDave Kleikamp 1582617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 1583617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 1584ac27a0ecSDave Kleikamp } 1585ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 1586ac27a0ecSDave Kleikamp return 1; 1587ac27a0ecSDave Kleikamp return 0; 1588ac27a0ecSDave Kleikamp } 1589ac27a0ecSDave Kleikamp 1590ac27a0ecSDave Kleikamp /* 1591617ba13bSMingming Cao * ext4_xattr_cache_find() 1592ac27a0ecSDave Kleikamp * 1593ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 1594ac27a0ecSDave Kleikamp * 1595ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 1596ac27a0ecSDave Kleikamp * not found or an error occurred. 1597ac27a0ecSDave Kleikamp */ 1598ac27a0ecSDave Kleikamp static struct buffer_head * 1599617ba13bSMingming Cao ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, 1600ac27a0ecSDave Kleikamp struct mb_cache_entry **pce) 1601ac27a0ecSDave Kleikamp { 1602ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 1603ac27a0ecSDave Kleikamp struct mb_cache_entry *ce; 16049c191f70ST Makphaibulchoke struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 1605ac27a0ecSDave Kleikamp 1606ac27a0ecSDave Kleikamp if (!header->h_hash) 1607ac27a0ecSDave Kleikamp return NULL; /* never share */ 1608ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 1609ac27a0ecSDave Kleikamp again: 16109c191f70ST Makphaibulchoke ce = mb_cache_entry_find_first(ext4_mb_cache, inode->i_sb->s_bdev, 16112aec7c52SAndreas Gruenbacher hash); 1612ac27a0ecSDave Kleikamp while (ce) { 1613ac27a0ecSDave Kleikamp struct buffer_head *bh; 1614ac27a0ecSDave Kleikamp 1615ac27a0ecSDave Kleikamp if (IS_ERR(ce)) { 1616ac27a0ecSDave Kleikamp if (PTR_ERR(ce) == -EAGAIN) 1617ac27a0ecSDave Kleikamp goto again; 1618ac27a0ecSDave Kleikamp break; 1619ac27a0ecSDave Kleikamp } 1620ac27a0ecSDave Kleikamp bh = sb_bread(inode->i_sb, ce->e_block); 1621ac27a0ecSDave Kleikamp if (!bh) { 162224676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 162324676da4STheodore Ts'o (unsigned long) ce->e_block); 1624ac27a0ecSDave Kleikamp } else if (le32_to_cpu(BHDR(bh)->h_refcount) >= 1625617ba13bSMingming Cao EXT4_XATTR_REFCOUNT_MAX) { 1626ac27a0ecSDave Kleikamp ea_idebug(inode, "block %lu refcount %d>=%d", 1627ac27a0ecSDave Kleikamp (unsigned long) ce->e_block, 1628ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount), 1629617ba13bSMingming Cao EXT4_XATTR_REFCOUNT_MAX); 1630617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 1631ac27a0ecSDave Kleikamp *pce = ce; 1632ac27a0ecSDave Kleikamp return bh; 1633ac27a0ecSDave Kleikamp } 1634ac27a0ecSDave Kleikamp brelse(bh); 16352aec7c52SAndreas Gruenbacher ce = mb_cache_entry_find_next(ce, inode->i_sb->s_bdev, hash); 1636ac27a0ecSDave Kleikamp } 1637ac27a0ecSDave Kleikamp return NULL; 1638ac27a0ecSDave Kleikamp } 1639ac27a0ecSDave Kleikamp 1640ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 1641ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 1642ac27a0ecSDave Kleikamp 1643ac27a0ecSDave Kleikamp /* 1644617ba13bSMingming Cao * ext4_xattr_hash_entry() 1645ac27a0ecSDave Kleikamp * 1646ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 1647ac27a0ecSDave Kleikamp */ 1648617ba13bSMingming Cao static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, 1649617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1650ac27a0ecSDave Kleikamp { 1651ac27a0ecSDave Kleikamp __u32 hash = 0; 1652ac27a0ecSDave Kleikamp char *name = entry->e_name; 1653ac27a0ecSDave Kleikamp int n; 1654ac27a0ecSDave Kleikamp 1655ac27a0ecSDave Kleikamp for (n = 0; n < entry->e_name_len; n++) { 1656ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 1657ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 1658ac27a0ecSDave Kleikamp *name++; 1659ac27a0ecSDave Kleikamp } 1660ac27a0ecSDave Kleikamp 1661ac27a0ecSDave Kleikamp if (entry->e_value_block == 0 && entry->e_value_size != 0) { 1662ac27a0ecSDave Kleikamp __le32 *value = (__le32 *)((char *)header + 1663ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs)); 1664ac27a0ecSDave Kleikamp for (n = (le32_to_cpu(entry->e_value_size) + 1665617ba13bSMingming Cao EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { 1666ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 1667ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 1668ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 1669ac27a0ecSDave Kleikamp } 1670ac27a0ecSDave Kleikamp } 1671ac27a0ecSDave Kleikamp entry->e_hash = cpu_to_le32(hash); 1672ac27a0ecSDave Kleikamp } 1673ac27a0ecSDave Kleikamp 1674ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 1675ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 1676ac27a0ecSDave Kleikamp 1677ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 1678ac27a0ecSDave Kleikamp 1679ac27a0ecSDave Kleikamp /* 1680617ba13bSMingming Cao * ext4_xattr_rehash() 1681ac27a0ecSDave Kleikamp * 1682ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 1683ac27a0ecSDave Kleikamp */ 1684617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *header, 1685617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1686ac27a0ecSDave Kleikamp { 1687617ba13bSMingming Cao struct ext4_xattr_entry *here; 1688ac27a0ecSDave Kleikamp __u32 hash = 0; 1689ac27a0ecSDave Kleikamp 1690617ba13bSMingming Cao ext4_xattr_hash_entry(header, entry); 1691ac27a0ecSDave Kleikamp here = ENTRY(header+1); 1692ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 1693ac27a0ecSDave Kleikamp if (!here->e_hash) { 1694ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 1695ac27a0ecSDave Kleikamp hash = 0; 1696ac27a0ecSDave Kleikamp break; 1697ac27a0ecSDave Kleikamp } 1698ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 1699ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 1700ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 1701617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 1702ac27a0ecSDave Kleikamp } 1703ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 1704ac27a0ecSDave Kleikamp } 1705ac27a0ecSDave Kleikamp 1706ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 1707ac27a0ecSDave Kleikamp 17089c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 17099c191f70ST Makphaibulchoke 17109c191f70ST Makphaibulchoke struct mb_cache * 17119c191f70ST Makphaibulchoke ext4_xattr_create_cache(char *name) 1712ac27a0ecSDave Kleikamp { 17139c191f70ST Makphaibulchoke return mb_cache_create(name, HASH_BUCKET_BITS); 1714ac27a0ecSDave Kleikamp } 1715ac27a0ecSDave Kleikamp 17169c191f70ST Makphaibulchoke void ext4_xattr_destroy_cache(struct mb_cache *cache) 1717ac27a0ecSDave Kleikamp { 17189c191f70ST Makphaibulchoke if (cache) 17199c191f70ST Makphaibulchoke mb_cache_destroy(cache); 1720ac27a0ecSDave Kleikamp } 17219c191f70ST Makphaibulchoke 1722