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 84617ba13bSMingming Cao static void ext4_xattr_cache_insert(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 93617ba13bSMingming Cao static struct mb_cache *ext4_xattr_cache; 94ac27a0ecSDave Kleikamp 9511e27528SStephen Hemminger static const struct xattr_handler *ext4_xattr_handler_map[] = { 96617ba13bSMingming Cao [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, 9703010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 98617ba13bSMingming Cao [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &ext4_xattr_acl_access_handler, 99617ba13bSMingming Cao [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &ext4_xattr_acl_default_handler, 100ac27a0ecSDave Kleikamp #endif 101617ba13bSMingming Cao [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, 10203010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 103617ba13bSMingming Cao [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, 104ac27a0ecSDave Kleikamp #endif 105ac27a0ecSDave Kleikamp }; 106ac27a0ecSDave Kleikamp 10711e27528SStephen Hemminger const struct xattr_handler *ext4_xattr_handlers[] = { 108617ba13bSMingming Cao &ext4_xattr_user_handler, 109617ba13bSMingming Cao &ext4_xattr_trusted_handler, 11003010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 111617ba13bSMingming Cao &ext4_xattr_acl_access_handler, 112617ba13bSMingming Cao &ext4_xattr_acl_default_handler, 113ac27a0ecSDave Kleikamp #endif 11403010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 115617ba13bSMingming Cao &ext4_xattr_security_handler, 116ac27a0ecSDave Kleikamp #endif 117ac27a0ecSDave Kleikamp NULL 118ac27a0ecSDave Kleikamp }; 119ac27a0ecSDave Kleikamp 120cc8e94fdSDarrick J. Wong static __le32 ext4_xattr_block_csum(struct inode *inode, 121cc8e94fdSDarrick J. Wong sector_t block_nr, 122cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 123cc8e94fdSDarrick J. Wong { 124cc8e94fdSDarrick J. Wong struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 125d6a77105STheodore Ts'o __u32 csum; 126d6a77105STheodore Ts'o __le32 save_csum; 127d6a77105STheodore Ts'o __le64 dsk_block_nr = cpu_to_le64(block_nr); 128cc8e94fdSDarrick J. Wong 129d6a77105STheodore Ts'o save_csum = hdr->h_checksum; 130cc8e94fdSDarrick J. Wong hdr->h_checksum = 0; 131d6a77105STheodore Ts'o csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, 132d6a77105STheodore Ts'o sizeof(dsk_block_nr)); 133cc8e94fdSDarrick J. Wong csum = ext4_chksum(sbi, csum, (__u8 *)hdr, 134cc8e94fdSDarrick J. Wong EXT4_BLOCK_SIZE(inode->i_sb)); 13541eb70ddSTao Ma 136d6a77105STheodore Ts'o hdr->h_checksum = save_csum; 137cc8e94fdSDarrick J. Wong return cpu_to_le32(csum); 138cc8e94fdSDarrick J. Wong } 139cc8e94fdSDarrick J. Wong 140cc8e94fdSDarrick J. Wong static int ext4_xattr_block_csum_verify(struct inode *inode, 141cc8e94fdSDarrick J. Wong sector_t block_nr, 142cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 143cc8e94fdSDarrick J. Wong { 144cc8e94fdSDarrick J. Wong if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, 145cc8e94fdSDarrick J. Wong EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && 146cc8e94fdSDarrick J. Wong (hdr->h_checksum != ext4_xattr_block_csum(inode, block_nr, hdr))) 147cc8e94fdSDarrick J. Wong return 0; 148cc8e94fdSDarrick J. Wong return 1; 149cc8e94fdSDarrick J. Wong } 150cc8e94fdSDarrick J. Wong 151cc8e94fdSDarrick J. Wong static void ext4_xattr_block_csum_set(struct inode *inode, 152cc8e94fdSDarrick J. Wong sector_t block_nr, 153cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 154cc8e94fdSDarrick J. Wong { 155cc8e94fdSDarrick J. Wong if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, 156cc8e94fdSDarrick J. Wong EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) 157cc8e94fdSDarrick J. Wong return; 158cc8e94fdSDarrick J. Wong 159cc8e94fdSDarrick J. Wong hdr->h_checksum = ext4_xattr_block_csum(inode, block_nr, hdr); 160cc8e94fdSDarrick J. Wong } 161cc8e94fdSDarrick J. Wong 162cc8e94fdSDarrick J. Wong static inline int ext4_handle_dirty_xattr_block(handle_t *handle, 163cc8e94fdSDarrick J. Wong struct inode *inode, 164cc8e94fdSDarrick J. Wong struct buffer_head *bh) 165cc8e94fdSDarrick J. Wong { 166cc8e94fdSDarrick J. Wong ext4_xattr_block_csum_set(inode, bh->b_blocknr, BHDR(bh)); 167cc8e94fdSDarrick J. Wong return ext4_handle_dirty_metadata(handle, inode, bh); 168cc8e94fdSDarrick J. Wong } 169cc8e94fdSDarrick J. Wong 17011e27528SStephen Hemminger static inline const struct xattr_handler * 171617ba13bSMingming Cao ext4_xattr_handler(int name_index) 172ac27a0ecSDave Kleikamp { 17311e27528SStephen Hemminger const struct xattr_handler *handler = NULL; 174ac27a0ecSDave Kleikamp 175617ba13bSMingming Cao if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) 176617ba13bSMingming Cao handler = ext4_xattr_handler_map[name_index]; 177ac27a0ecSDave Kleikamp return handler; 178ac27a0ecSDave Kleikamp } 179ac27a0ecSDave Kleikamp 180ac27a0ecSDave Kleikamp /* 181ac27a0ecSDave Kleikamp * Inode operation listxattr() 182ac27a0ecSDave Kleikamp * 183ac27a0ecSDave Kleikamp * dentry->d_inode->i_mutex: don't care 184ac27a0ecSDave Kleikamp */ 185ac27a0ecSDave Kleikamp ssize_t 186617ba13bSMingming Cao ext4_listxattr(struct dentry *dentry, char *buffer, size_t size) 187ac27a0ecSDave Kleikamp { 188431547b3SChristoph Hellwig return ext4_xattr_list(dentry, buffer, size); 189ac27a0ecSDave Kleikamp } 190ac27a0ecSDave Kleikamp 191ac27a0ecSDave Kleikamp static int 192617ba13bSMingming Cao ext4_xattr_check_names(struct ext4_xattr_entry *entry, void *end) 193ac27a0ecSDave Kleikamp { 194ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry)) { 195617ba13bSMingming Cao struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(entry); 196ac27a0ecSDave Kleikamp if ((void *)next >= end) 197ac27a0ecSDave Kleikamp return -EIO; 198ac27a0ecSDave Kleikamp entry = next; 199ac27a0ecSDave Kleikamp } 200ac27a0ecSDave Kleikamp return 0; 201ac27a0ecSDave Kleikamp } 202ac27a0ecSDave Kleikamp 203ac27a0ecSDave Kleikamp static inline int 204cc8e94fdSDarrick J. Wong ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) 205ac27a0ecSDave Kleikamp { 206cc8e94fdSDarrick J. Wong int error; 207cc8e94fdSDarrick J. Wong 208cc8e94fdSDarrick J. Wong if (buffer_verified(bh)) 209cc8e94fdSDarrick J. Wong return 0; 210cc8e94fdSDarrick J. Wong 211617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 212ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) 213ac27a0ecSDave Kleikamp return -EIO; 214cc8e94fdSDarrick J. Wong if (!ext4_xattr_block_csum_verify(inode, bh->b_blocknr, BHDR(bh))) 215cc8e94fdSDarrick J. Wong return -EIO; 216cc8e94fdSDarrick J. Wong error = ext4_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size); 217cc8e94fdSDarrick J. Wong if (!error) 218cc8e94fdSDarrick J. Wong set_buffer_verified(bh); 219cc8e94fdSDarrick J. Wong return error; 220ac27a0ecSDave Kleikamp } 221ac27a0ecSDave Kleikamp 222ac27a0ecSDave Kleikamp static inline int 223617ba13bSMingming Cao ext4_xattr_check_entry(struct ext4_xattr_entry *entry, size_t size) 224ac27a0ecSDave Kleikamp { 225ac27a0ecSDave Kleikamp size_t value_size = le32_to_cpu(entry->e_value_size); 226ac27a0ecSDave Kleikamp 227ac27a0ecSDave Kleikamp if (entry->e_value_block != 0 || value_size > size || 228ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs) + value_size > size) 229ac27a0ecSDave Kleikamp return -EIO; 230ac27a0ecSDave Kleikamp return 0; 231ac27a0ecSDave Kleikamp } 232ac27a0ecSDave Kleikamp 233ac27a0ecSDave Kleikamp static int 234617ba13bSMingming Cao ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, 235ac27a0ecSDave Kleikamp const char *name, size_t size, int sorted) 236ac27a0ecSDave Kleikamp { 237617ba13bSMingming Cao struct ext4_xattr_entry *entry; 238ac27a0ecSDave Kleikamp size_t name_len; 239ac27a0ecSDave Kleikamp int cmp = 1; 240ac27a0ecSDave Kleikamp 241ac27a0ecSDave Kleikamp if (name == NULL) 242ac27a0ecSDave Kleikamp return -EINVAL; 243ac27a0ecSDave Kleikamp name_len = strlen(name); 244ac27a0ecSDave Kleikamp entry = *pentry; 245617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 246ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 247ac27a0ecSDave Kleikamp if (!cmp) 248ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 249ac27a0ecSDave Kleikamp if (!cmp) 250ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 251ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 252ac27a0ecSDave Kleikamp break; 253ac27a0ecSDave Kleikamp } 254ac27a0ecSDave Kleikamp *pentry = entry; 255617ba13bSMingming Cao if (!cmp && ext4_xattr_check_entry(entry, size)) 256ac27a0ecSDave Kleikamp return -EIO; 257ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 258ac27a0ecSDave Kleikamp } 259ac27a0ecSDave Kleikamp 260ac27a0ecSDave Kleikamp static int 261617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 262ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 263ac27a0ecSDave Kleikamp { 264ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 265617ba13bSMingming Cao struct ext4_xattr_entry *entry; 266ac27a0ecSDave Kleikamp size_t size; 267ac27a0ecSDave Kleikamp int error; 268ac27a0ecSDave Kleikamp 269ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 270ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 271ac27a0ecSDave Kleikamp 272ac27a0ecSDave Kleikamp error = -ENODATA; 273617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 274ac27a0ecSDave Kleikamp goto cleanup; 275ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 276ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 277617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 278ac27a0ecSDave Kleikamp if (!bh) 279ac27a0ecSDave Kleikamp goto cleanup; 280ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 281ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 282cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 28312062dddSEric Sandeen bad_block: 28424676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 285617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 286ac27a0ecSDave Kleikamp error = -EIO; 287ac27a0ecSDave Kleikamp goto cleanup; 288ac27a0ecSDave Kleikamp } 289617ba13bSMingming Cao ext4_xattr_cache_insert(bh); 290ac27a0ecSDave Kleikamp entry = BFIRST(bh); 291617ba13bSMingming Cao error = ext4_xattr_find_entry(&entry, name_index, name, bh->b_size, 1); 292ac27a0ecSDave Kleikamp if (error == -EIO) 293ac27a0ecSDave Kleikamp goto bad_block; 294ac27a0ecSDave Kleikamp if (error) 295ac27a0ecSDave Kleikamp goto cleanup; 296ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 297ac27a0ecSDave Kleikamp if (buffer) { 298ac27a0ecSDave Kleikamp error = -ERANGE; 299ac27a0ecSDave Kleikamp if (size > buffer_size) 300ac27a0ecSDave Kleikamp goto cleanup; 301ac27a0ecSDave Kleikamp memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs), 302ac27a0ecSDave Kleikamp size); 303ac27a0ecSDave Kleikamp } 304ac27a0ecSDave Kleikamp error = size; 305ac27a0ecSDave Kleikamp 306ac27a0ecSDave Kleikamp cleanup: 307ac27a0ecSDave Kleikamp brelse(bh); 308ac27a0ecSDave Kleikamp return error; 309ac27a0ecSDave Kleikamp } 310ac27a0ecSDave Kleikamp 311879b3825STao Ma int 312617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 313ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 314ac27a0ecSDave Kleikamp { 315617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 316617ba13bSMingming Cao struct ext4_xattr_entry *entry; 317617ba13bSMingming Cao struct ext4_inode *raw_inode; 318617ba13bSMingming Cao struct ext4_iloc iloc; 319ac27a0ecSDave Kleikamp size_t size; 320ac27a0ecSDave Kleikamp void *end; 321ac27a0ecSDave Kleikamp int error; 322ac27a0ecSDave Kleikamp 32319f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 324ac27a0ecSDave Kleikamp return -ENODATA; 325617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 326ac27a0ecSDave Kleikamp if (error) 327ac27a0ecSDave Kleikamp return error; 328617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 329ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 330ac27a0ecSDave Kleikamp entry = IFIRST(header); 331617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 332617ba13bSMingming Cao error = ext4_xattr_check_names(entry, end); 333ac27a0ecSDave Kleikamp if (error) 334ac27a0ecSDave Kleikamp goto cleanup; 335617ba13bSMingming Cao error = ext4_xattr_find_entry(&entry, name_index, name, 336ac27a0ecSDave Kleikamp end - (void *)entry, 0); 337ac27a0ecSDave Kleikamp if (error) 338ac27a0ecSDave Kleikamp goto cleanup; 339ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 340ac27a0ecSDave Kleikamp if (buffer) { 341ac27a0ecSDave Kleikamp error = -ERANGE; 342ac27a0ecSDave Kleikamp if (size > buffer_size) 343ac27a0ecSDave Kleikamp goto cleanup; 344ac27a0ecSDave Kleikamp memcpy(buffer, (void *)IFIRST(header) + 345ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs), size); 346ac27a0ecSDave Kleikamp } 347ac27a0ecSDave Kleikamp error = size; 348ac27a0ecSDave Kleikamp 349ac27a0ecSDave Kleikamp cleanup: 350ac27a0ecSDave Kleikamp brelse(iloc.bh); 351ac27a0ecSDave Kleikamp return error; 352ac27a0ecSDave Kleikamp } 353ac27a0ecSDave Kleikamp 354ac27a0ecSDave Kleikamp /* 355617ba13bSMingming Cao * ext4_xattr_get() 356ac27a0ecSDave Kleikamp * 357ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 358ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 359ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 360ac27a0ecSDave Kleikamp * 361ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 362ac27a0ecSDave Kleikamp * used / required on success. 363ac27a0ecSDave Kleikamp */ 364ac27a0ecSDave Kleikamp int 365617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 366ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 367ac27a0ecSDave Kleikamp { 368ac27a0ecSDave Kleikamp int error; 369ac27a0ecSDave Kleikamp 370617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 371617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 372ac27a0ecSDave Kleikamp buffer_size); 373ac27a0ecSDave Kleikamp if (error == -ENODATA) 374617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 375ac27a0ecSDave Kleikamp buffer_size); 376617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 377ac27a0ecSDave Kleikamp return error; 378ac27a0ecSDave Kleikamp } 379ac27a0ecSDave Kleikamp 380ac27a0ecSDave Kleikamp static int 381431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 382ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 383ac27a0ecSDave Kleikamp { 384ac27a0ecSDave Kleikamp size_t rest = buffer_size; 385ac27a0ecSDave Kleikamp 386617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 38711e27528SStephen Hemminger const struct xattr_handler *handler = 388617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 389ac27a0ecSDave Kleikamp 390ac27a0ecSDave Kleikamp if (handler) { 391431547b3SChristoph Hellwig size_t size = handler->list(dentry, buffer, rest, 392ac27a0ecSDave Kleikamp entry->e_name, 393431547b3SChristoph Hellwig entry->e_name_len, 394431547b3SChristoph Hellwig handler->flags); 395ac27a0ecSDave Kleikamp if (buffer) { 396ac27a0ecSDave Kleikamp if (size > rest) 397ac27a0ecSDave Kleikamp return -ERANGE; 398ac27a0ecSDave Kleikamp buffer += size; 399ac27a0ecSDave Kleikamp } 400ac27a0ecSDave Kleikamp rest -= size; 401ac27a0ecSDave Kleikamp } 402ac27a0ecSDave Kleikamp } 403ac27a0ecSDave Kleikamp return buffer_size - rest; 404ac27a0ecSDave Kleikamp } 405ac27a0ecSDave Kleikamp 406ac27a0ecSDave Kleikamp static int 407431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 408ac27a0ecSDave Kleikamp { 409431547b3SChristoph Hellwig struct inode *inode = dentry->d_inode; 410ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 411ac27a0ecSDave Kleikamp int error; 412ac27a0ecSDave Kleikamp 413ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 414ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 415ac27a0ecSDave Kleikamp 416ac27a0ecSDave Kleikamp error = 0; 417617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 418ac27a0ecSDave Kleikamp goto cleanup; 419ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 420ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 421617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 422ac27a0ecSDave Kleikamp error = -EIO; 423ac27a0ecSDave Kleikamp if (!bh) 424ac27a0ecSDave Kleikamp goto cleanup; 425ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 426ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 427cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 42824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 429617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 430ac27a0ecSDave Kleikamp error = -EIO; 431ac27a0ecSDave Kleikamp goto cleanup; 432ac27a0ecSDave Kleikamp } 433617ba13bSMingming Cao ext4_xattr_cache_insert(bh); 434431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); 435ac27a0ecSDave Kleikamp 436ac27a0ecSDave Kleikamp cleanup: 437ac27a0ecSDave Kleikamp brelse(bh); 438ac27a0ecSDave Kleikamp 439ac27a0ecSDave Kleikamp return error; 440ac27a0ecSDave Kleikamp } 441ac27a0ecSDave Kleikamp 442ac27a0ecSDave Kleikamp static int 443431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 444ac27a0ecSDave Kleikamp { 445431547b3SChristoph Hellwig struct inode *inode = dentry->d_inode; 446617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 447617ba13bSMingming Cao struct ext4_inode *raw_inode; 448617ba13bSMingming Cao struct ext4_iloc iloc; 449ac27a0ecSDave Kleikamp void *end; 450ac27a0ecSDave Kleikamp int error; 451ac27a0ecSDave Kleikamp 45219f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 453ac27a0ecSDave Kleikamp return 0; 454617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 455ac27a0ecSDave Kleikamp if (error) 456ac27a0ecSDave Kleikamp return error; 457617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 458ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 459617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 460617ba13bSMingming Cao error = ext4_xattr_check_names(IFIRST(header), end); 461ac27a0ecSDave Kleikamp if (error) 462ac27a0ecSDave Kleikamp goto cleanup; 463431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 464ac27a0ecSDave Kleikamp buffer, buffer_size); 465ac27a0ecSDave Kleikamp 466ac27a0ecSDave Kleikamp cleanup: 467ac27a0ecSDave Kleikamp brelse(iloc.bh); 468ac27a0ecSDave Kleikamp return error; 469ac27a0ecSDave Kleikamp } 470ac27a0ecSDave Kleikamp 471ac27a0ecSDave Kleikamp /* 472617ba13bSMingming Cao * ext4_xattr_list() 473ac27a0ecSDave Kleikamp * 474ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 475ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 476ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 477ac27a0ecSDave Kleikamp * 478ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 479ac27a0ecSDave Kleikamp * used / required on success. 480ac27a0ecSDave Kleikamp */ 481d3a95d47SMingming Cao static int 482431547b3SChristoph Hellwig ext4_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size) 483ac27a0ecSDave Kleikamp { 484eaeef867STheodore Ts'o int ret, ret2; 485ac27a0ecSDave Kleikamp 486431547b3SChristoph Hellwig down_read(&EXT4_I(dentry->d_inode)->xattr_sem); 487eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 488eaeef867STheodore Ts'o if (ret < 0) 489eaeef867STheodore Ts'o goto errout; 490ac27a0ecSDave Kleikamp if (buffer) { 491eaeef867STheodore Ts'o buffer += ret; 492eaeef867STheodore Ts'o buffer_size -= ret; 493ac27a0ecSDave Kleikamp } 494eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 495eaeef867STheodore Ts'o if (ret < 0) 496eaeef867STheodore Ts'o goto errout; 497eaeef867STheodore Ts'o ret += ret2; 498eaeef867STheodore Ts'o errout: 499431547b3SChristoph Hellwig up_read(&EXT4_I(dentry->d_inode)->xattr_sem); 500eaeef867STheodore Ts'o return ret; 501ac27a0ecSDave Kleikamp } 502ac27a0ecSDave Kleikamp 503ac27a0ecSDave Kleikamp /* 504617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 505ac27a0ecSDave Kleikamp * not set, set it. 506ac27a0ecSDave Kleikamp */ 507617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 508ac27a0ecSDave Kleikamp struct super_block *sb) 509ac27a0ecSDave Kleikamp { 510617ba13bSMingming Cao if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_EXT_ATTR)) 511ac27a0ecSDave Kleikamp return; 512ac27a0ecSDave Kleikamp 513617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 514ed2908f3SAndreas Gruenbacher EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_EXT_ATTR); 515a0375156STheodore Ts'o ext4_handle_dirty_super(handle, sb); 516ac27a0ecSDave Kleikamp } 517ac27a0ecSDave Kleikamp } 518ac27a0ecSDave Kleikamp 519ac27a0ecSDave Kleikamp /* 520ac27a0ecSDave Kleikamp * Release the xattr block BH: If the reference count is > 1, decrement 521ac27a0ecSDave Kleikamp * it; otherwise free the block. 522ac27a0ecSDave Kleikamp */ 523ac27a0ecSDave Kleikamp static void 524617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 525ac27a0ecSDave Kleikamp struct buffer_head *bh) 526ac27a0ecSDave Kleikamp { 527ac27a0ecSDave Kleikamp struct mb_cache_entry *ce = NULL; 5288a2bfdcbSMingming Cao int error = 0; 529ac27a0ecSDave Kleikamp 530617ba13bSMingming Cao ce = mb_cache_entry_get(ext4_xattr_cache, bh->b_bdev, bh->b_blocknr); 5318a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 5328a2bfdcbSMingming Cao if (error) 5338a2bfdcbSMingming Cao goto out; 5348a2bfdcbSMingming Cao 5358a2bfdcbSMingming Cao lock_buffer(bh); 536ac27a0ecSDave Kleikamp if (BHDR(bh)->h_refcount == cpu_to_le32(1)) { 537ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 538ac27a0ecSDave Kleikamp if (ce) 539ac27a0ecSDave Kleikamp mb_cache_entry_free(ce); 540ac27a0ecSDave Kleikamp get_bh(bh); 541e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 542e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 543e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 544c1bb05a6SEric Sandeen unlock_buffer(bh); 545ac27a0ecSDave Kleikamp } else { 546e8546d06SMarcin Slusarz le32_add_cpu(&BHDR(bh)->h_refcount, -1); 547c1bb05a6SEric Sandeen if (ce) 548c1bb05a6SEric Sandeen mb_cache_entry_release(ce); 549c1bb05a6SEric Sandeen unlock_buffer(bh); 550cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, inode, bh); 551ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 5520390131bSFrank Mayhar ext4_handle_sync(handle); 5531231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 554ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 555ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 556ac27a0ecSDave Kleikamp } 5578a2bfdcbSMingming Cao out: 5588a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 5598a2bfdcbSMingming Cao return; 560ac27a0ecSDave Kleikamp } 561ac27a0ecSDave Kleikamp 5626dd4ee7cSKalpak Shah /* 5636dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 5646dd4ee7cSKalpak Shah * bytes used by EA entries. 5656dd4ee7cSKalpak Shah */ 5666dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 5676dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 5686dd4ee7cSKalpak Shah { 5696dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 5706dd4ee7cSKalpak Shah *total += EXT4_XATTR_LEN(last->e_name_len); 5716dd4ee7cSKalpak Shah if (!last->e_value_block && last->e_value_size) { 5726dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 5736dd4ee7cSKalpak Shah if (offs < *min_offs) 5746dd4ee7cSKalpak Shah *min_offs = offs; 5756dd4ee7cSKalpak Shah } 5766dd4ee7cSKalpak Shah } 5776dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 5786dd4ee7cSKalpak Shah } 5796dd4ee7cSKalpak Shah 580ac27a0ecSDave Kleikamp static int 581617ba13bSMingming Cao ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s) 582ac27a0ecSDave Kleikamp { 583617ba13bSMingming Cao struct ext4_xattr_entry *last; 584ac27a0ecSDave Kleikamp size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); 585ac27a0ecSDave Kleikamp 586ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 587ac27a0ecSDave Kleikamp last = s->first; 588617ba13bSMingming Cao for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 589ac27a0ecSDave Kleikamp if (!last->e_value_block && last->e_value_size) { 590ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 591ac27a0ecSDave Kleikamp if (offs < min_offs) 592ac27a0ecSDave Kleikamp min_offs = offs; 593ac27a0ecSDave Kleikamp } 594ac27a0ecSDave Kleikamp } 595ac27a0ecSDave Kleikamp free = min_offs - ((void *)last - s->base) - sizeof(__u32); 596ac27a0ecSDave Kleikamp if (!s->not_found) { 597ac27a0ecSDave Kleikamp if (!s->here->e_value_block && s->here->e_value_size) { 598ac27a0ecSDave Kleikamp size_t size = le32_to_cpu(s->here->e_value_size); 599617ba13bSMingming Cao free += EXT4_XATTR_SIZE(size); 600ac27a0ecSDave Kleikamp } 601617ba13bSMingming Cao free += EXT4_XATTR_LEN(name_len); 602ac27a0ecSDave Kleikamp } 603ac27a0ecSDave Kleikamp if (i->value) { 604617ba13bSMingming Cao if (free < EXT4_XATTR_SIZE(i->value_len) || 605617ba13bSMingming Cao free < EXT4_XATTR_LEN(name_len) + 606617ba13bSMingming Cao EXT4_XATTR_SIZE(i->value_len)) 607ac27a0ecSDave Kleikamp return -ENOSPC; 608ac27a0ecSDave Kleikamp } 609ac27a0ecSDave Kleikamp 610ac27a0ecSDave Kleikamp if (i->value && s->not_found) { 611ac27a0ecSDave Kleikamp /* Insert the new name. */ 612617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 613ac27a0ecSDave Kleikamp size_t rest = (void *)last - (void *)s->here + sizeof(__u32); 614ac27a0ecSDave Kleikamp memmove((void *)s->here + size, s->here, rest); 615ac27a0ecSDave Kleikamp memset(s->here, 0, size); 616ac27a0ecSDave Kleikamp s->here->e_name_index = i->name_index; 617ac27a0ecSDave Kleikamp s->here->e_name_len = name_len; 618ac27a0ecSDave Kleikamp memcpy(s->here->e_name, i->name, name_len); 619ac27a0ecSDave Kleikamp } else { 620ac27a0ecSDave Kleikamp if (!s->here->e_value_block && s->here->e_value_size) { 621ac27a0ecSDave Kleikamp void *first_val = s->base + min_offs; 622ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(s->here->e_value_offs); 623ac27a0ecSDave Kleikamp void *val = s->base + offs; 624617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE( 625ac27a0ecSDave Kleikamp le32_to_cpu(s->here->e_value_size)); 626ac27a0ecSDave Kleikamp 627617ba13bSMingming Cao if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { 628ac27a0ecSDave Kleikamp /* The old and the new value have the same 629ac27a0ecSDave Kleikamp size. Just replace. */ 630ac27a0ecSDave Kleikamp s->here->e_value_size = 631ac27a0ecSDave Kleikamp cpu_to_le32(i->value_len); 632bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 633bd9926e8STheodore Ts'o memset(val, 0, size); 634bd9926e8STheodore Ts'o } else { 635bd9926e8STheodore Ts'o /* Clear pad bytes first. */ 636617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 637bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 638ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 639bd9926e8STheodore Ts'o } 640ac27a0ecSDave Kleikamp return 0; 641ac27a0ecSDave Kleikamp } 642ac27a0ecSDave Kleikamp 643ac27a0ecSDave Kleikamp /* Remove the old value. */ 644ac27a0ecSDave Kleikamp memmove(first_val + size, first_val, val - first_val); 645ac27a0ecSDave Kleikamp memset(first_val, 0, size); 646ac27a0ecSDave Kleikamp s->here->e_value_size = 0; 647ac27a0ecSDave Kleikamp s->here->e_value_offs = 0; 648ac27a0ecSDave Kleikamp min_offs += size; 649ac27a0ecSDave Kleikamp 650ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 651ac27a0ecSDave Kleikamp last = s->first; 652ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 653ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 654ac27a0ecSDave Kleikamp if (!last->e_value_block && 655ac27a0ecSDave Kleikamp last->e_value_size && o < offs) 656ac27a0ecSDave Kleikamp last->e_value_offs = 657ac27a0ecSDave Kleikamp cpu_to_le16(o + size); 658617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 659ac27a0ecSDave Kleikamp } 660ac27a0ecSDave Kleikamp } 661ac27a0ecSDave Kleikamp if (!i->value) { 662ac27a0ecSDave Kleikamp /* Remove the old name. */ 663617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 664ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 665ac27a0ecSDave Kleikamp memmove(s->here, (void *)s->here + size, 666ac27a0ecSDave Kleikamp (void *)last - (void *)s->here + sizeof(__u32)); 667ac27a0ecSDave Kleikamp memset(last, 0, size); 668ac27a0ecSDave Kleikamp } 669ac27a0ecSDave Kleikamp } 670ac27a0ecSDave Kleikamp 671ac27a0ecSDave Kleikamp if (i->value) { 672ac27a0ecSDave Kleikamp /* Insert the new value. */ 673ac27a0ecSDave Kleikamp s->here->e_value_size = cpu_to_le32(i->value_len); 674ac27a0ecSDave Kleikamp if (i->value_len) { 675617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE(i->value_len); 676ac27a0ecSDave Kleikamp void *val = s->base + min_offs - size; 677ac27a0ecSDave Kleikamp s->here->e_value_offs = cpu_to_le16(min_offs - size); 678bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 679bd9926e8STheodore Ts'o memset(val, 0, size); 680bd9926e8STheodore Ts'o } else { 681bd9926e8STheodore Ts'o /* Clear the pad bytes first. */ 682617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 683bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 684ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 685ac27a0ecSDave Kleikamp } 686ac27a0ecSDave Kleikamp } 687bd9926e8STheodore Ts'o } 688ac27a0ecSDave Kleikamp return 0; 689ac27a0ecSDave Kleikamp } 690ac27a0ecSDave Kleikamp 691617ba13bSMingming Cao struct ext4_xattr_block_find { 692617ba13bSMingming Cao struct ext4_xattr_search s; 693ac27a0ecSDave Kleikamp struct buffer_head *bh; 694ac27a0ecSDave Kleikamp }; 695ac27a0ecSDave Kleikamp 696ac27a0ecSDave Kleikamp static int 697617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 698617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 699ac27a0ecSDave Kleikamp { 700ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 701ac27a0ecSDave Kleikamp int error; 702ac27a0ecSDave Kleikamp 703ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 704ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 705ac27a0ecSDave Kleikamp 706617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 707ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 708617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 709ac27a0ecSDave Kleikamp error = -EIO; 710ac27a0ecSDave Kleikamp if (!bs->bh) 711ac27a0ecSDave Kleikamp goto cleanup; 712ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 713ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 714ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 715cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bs->bh)) { 71624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 71724676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 718ac27a0ecSDave Kleikamp error = -EIO; 719ac27a0ecSDave Kleikamp goto cleanup; 720ac27a0ecSDave Kleikamp } 721ac27a0ecSDave Kleikamp /* Find the named attribute. */ 722ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 723ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 724ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 725ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 726617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 727ac27a0ecSDave Kleikamp i->name, bs->bh->b_size, 1); 728ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 729ac27a0ecSDave Kleikamp goto cleanup; 730ac27a0ecSDave Kleikamp bs->s.not_found = error; 731ac27a0ecSDave Kleikamp } 732ac27a0ecSDave Kleikamp error = 0; 733ac27a0ecSDave Kleikamp 734ac27a0ecSDave Kleikamp cleanup: 735ac27a0ecSDave Kleikamp return error; 736ac27a0ecSDave Kleikamp } 737ac27a0ecSDave Kleikamp 738ac27a0ecSDave Kleikamp static int 739617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 740617ba13bSMingming Cao struct ext4_xattr_info *i, 741617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 742ac27a0ecSDave Kleikamp { 743ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 744ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 745617ba13bSMingming Cao struct ext4_xattr_search *s = &bs->s; 746ac27a0ecSDave Kleikamp struct mb_cache_entry *ce = NULL; 7478a2bfdcbSMingming Cao int error = 0; 748ac27a0ecSDave Kleikamp 749617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 750ac27a0ecSDave Kleikamp 751ac27a0ecSDave Kleikamp if (i->value && i->value_len > sb->s_blocksize) 752ac27a0ecSDave Kleikamp return -ENOSPC; 753ac27a0ecSDave Kleikamp if (s->base) { 754617ba13bSMingming Cao ce = mb_cache_entry_get(ext4_xattr_cache, bs->bh->b_bdev, 755ac27a0ecSDave Kleikamp bs->bh->b_blocknr); 7568a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 7578a2bfdcbSMingming Cao if (error) 7588a2bfdcbSMingming Cao goto cleanup; 7598a2bfdcbSMingming Cao lock_buffer(bs->bh); 7608a2bfdcbSMingming Cao 761ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 762ac27a0ecSDave Kleikamp if (ce) { 763ac27a0ecSDave Kleikamp mb_cache_entry_free(ce); 764ac27a0ecSDave Kleikamp ce = NULL; 765ac27a0ecSDave Kleikamp } 766ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 767617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 768ac27a0ecSDave Kleikamp if (!error) { 769ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 770617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), 771ac27a0ecSDave Kleikamp s->here); 772617ba13bSMingming Cao ext4_xattr_cache_insert(bs->bh); 773ac27a0ecSDave Kleikamp } 774ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 775ac27a0ecSDave Kleikamp if (error == -EIO) 776ac27a0ecSDave Kleikamp goto bad_block; 777ac27a0ecSDave Kleikamp if (!error) 778cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 7790390131bSFrank Mayhar inode, 780ac27a0ecSDave Kleikamp bs->bh); 781ac27a0ecSDave Kleikamp if (error) 782ac27a0ecSDave Kleikamp goto cleanup; 783ac27a0ecSDave Kleikamp goto inserted; 784ac27a0ecSDave Kleikamp } else { 785ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 786ac27a0ecSDave Kleikamp 7878a2bfdcbSMingming Cao unlock_buffer(bs->bh); 788ac27a0ecSDave Kleikamp if (ce) { 789ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 790ac27a0ecSDave Kleikamp ce = NULL; 791ac27a0ecSDave Kleikamp } 792ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 793216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 794ac27a0ecSDave Kleikamp error = -ENOMEM; 795ac27a0ecSDave Kleikamp if (s->base == NULL) 796ac27a0ecSDave Kleikamp goto cleanup; 797ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 798ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 799ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 800ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 801ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 802ac27a0ecSDave Kleikamp } 803ac27a0ecSDave Kleikamp } else { 804ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 805216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 806ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 807ac27a0ecSDave Kleikamp error = -ENOMEM; 808ac27a0ecSDave Kleikamp if (s->base == NULL) 809ac27a0ecSDave Kleikamp goto cleanup; 810617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 811ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 812ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 813ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 814ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 815ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 816ac27a0ecSDave Kleikamp } 817ac27a0ecSDave Kleikamp 818617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 819ac27a0ecSDave Kleikamp if (error == -EIO) 820ac27a0ecSDave Kleikamp goto bad_block; 821ac27a0ecSDave Kleikamp if (error) 822ac27a0ecSDave Kleikamp goto cleanup; 823ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 824617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), s->here); 825ac27a0ecSDave Kleikamp 826ac27a0ecSDave Kleikamp inserted: 827ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 828617ba13bSMingming Cao new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); 829ac27a0ecSDave Kleikamp if (new_bh) { 830ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 831ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 832ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 833ac27a0ecSDave Kleikamp else { 834ac27a0ecSDave Kleikamp /* The old block is released after updating 835ac27a0ecSDave Kleikamp the inode. */ 8361231b3a1SLukas Czerner error = dquot_alloc_block(inode, 8371231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 8385dd4056dSChristoph Hellwig if (error) 839ac27a0ecSDave Kleikamp goto cleanup; 840617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 841ac27a0ecSDave Kleikamp new_bh); 842ac27a0ecSDave Kleikamp if (error) 843ac27a0ecSDave Kleikamp goto cleanup_dquot; 844ac27a0ecSDave Kleikamp lock_buffer(new_bh); 845e8546d06SMarcin Slusarz le32_add_cpu(&BHDR(new_bh)->h_refcount, 1); 846ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 847ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(new_bh)->h_refcount)); 848ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 849cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 8500390131bSFrank Mayhar inode, 851ac27a0ecSDave Kleikamp new_bh); 852ac27a0ecSDave Kleikamp if (error) 853ac27a0ecSDave Kleikamp goto cleanup_dquot; 854ac27a0ecSDave Kleikamp } 855ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 856ac27a0ecSDave Kleikamp ce = NULL; 857ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 858ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 859ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 860ac27a0ecSDave Kleikamp new_bh = bs->bh; 861ac27a0ecSDave Kleikamp get_bh(new_bh); 862ac27a0ecSDave Kleikamp } else { 863ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 864fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 865fb0a387dSEric Sandeen 866fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 867d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 868fb0a387dSEric Sandeen 869fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 87012e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 871fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 872fb0a387dSEric Sandeen 8736d6a4351SEric Sandeen /* 8746d6a4351SEric Sandeen * take i_data_sem because we will test 8756d6a4351SEric Sandeen * i_delalloc_reserved_flag in ext4_mb_new_blocks 8766d6a4351SEric Sandeen */ 8776d6a4351SEric Sandeen down_read((&EXT4_I(inode)->i_data_sem)); 87855f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 87955f020dbSAllison Henderson NULL, &error); 8806d6a4351SEric Sandeen up_read((&EXT4_I(inode)->i_data_sem)); 881ac27a0ecSDave Kleikamp if (error) 882ac27a0ecSDave Kleikamp goto cleanup; 883fb0a387dSEric Sandeen 88412e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 885fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 886fb0a387dSEric Sandeen 887ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 888ace36ad4SJoe Perches (unsigned long long)block); 889ac27a0ecSDave Kleikamp 890ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 891aebf0243SWang Shilong if (unlikely(!new_bh)) { 892860d21e2STheodore Ts'o error = -ENOMEM; 893ac27a0ecSDave Kleikamp getblk_failed: 8947dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 895e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 896ac27a0ecSDave Kleikamp goto cleanup; 897ac27a0ecSDave Kleikamp } 898ac27a0ecSDave Kleikamp lock_buffer(new_bh); 899617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 900ac27a0ecSDave Kleikamp if (error) { 901ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 902860d21e2STheodore Ts'o error = -EIO; 903ac27a0ecSDave Kleikamp goto getblk_failed; 904ac27a0ecSDave Kleikamp } 905ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 906ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 907ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 908617ba13bSMingming Cao ext4_xattr_cache_insert(new_bh); 909cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 9100390131bSFrank Mayhar inode, new_bh); 911ac27a0ecSDave Kleikamp if (error) 912ac27a0ecSDave Kleikamp goto cleanup; 913ac27a0ecSDave Kleikamp } 914ac27a0ecSDave Kleikamp } 915ac27a0ecSDave Kleikamp 916ac27a0ecSDave Kleikamp /* Update the inode. */ 917617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 918ac27a0ecSDave Kleikamp 919ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 920ac27a0ecSDave Kleikamp if (bs->bh && bs->bh != new_bh) 921617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bs->bh); 922ac27a0ecSDave Kleikamp error = 0; 923ac27a0ecSDave Kleikamp 924ac27a0ecSDave Kleikamp cleanup: 925ac27a0ecSDave Kleikamp if (ce) 926ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 927ac27a0ecSDave Kleikamp brelse(new_bh); 928ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 929ac27a0ecSDave Kleikamp kfree(s->base); 930ac27a0ecSDave Kleikamp 931ac27a0ecSDave Kleikamp return error; 932ac27a0ecSDave Kleikamp 933ac27a0ecSDave Kleikamp cleanup_dquot: 9341231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 935ac27a0ecSDave Kleikamp goto cleanup; 936ac27a0ecSDave Kleikamp 937ac27a0ecSDave Kleikamp bad_block: 93824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 93924676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 940ac27a0ecSDave Kleikamp goto cleanup; 941ac27a0ecSDave Kleikamp 942ac27a0ecSDave Kleikamp #undef header 943ac27a0ecSDave Kleikamp } 944ac27a0ecSDave Kleikamp 945879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 946617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 947ac27a0ecSDave Kleikamp { 948617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 949617ba13bSMingming Cao struct ext4_inode *raw_inode; 950ac27a0ecSDave Kleikamp int error; 951ac27a0ecSDave Kleikamp 952617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 953ac27a0ecSDave Kleikamp return 0; 954617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 955ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 956ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 957ac27a0ecSDave Kleikamp is->s.here = is->s.first; 958617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 95919f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 960617ba13bSMingming Cao error = ext4_xattr_check_names(IFIRST(header), is->s.end); 961ac27a0ecSDave Kleikamp if (error) 962ac27a0ecSDave Kleikamp return error; 963ac27a0ecSDave Kleikamp /* Find the named attribute. */ 964617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 965ac27a0ecSDave Kleikamp i->name, is->s.end - 966ac27a0ecSDave Kleikamp (void *)is->s.base, 0); 967ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 968ac27a0ecSDave Kleikamp return error; 969ac27a0ecSDave Kleikamp is->s.not_found = error; 970ac27a0ecSDave Kleikamp } 971ac27a0ecSDave Kleikamp return 0; 972ac27a0ecSDave Kleikamp } 973ac27a0ecSDave Kleikamp 9740d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 9750d812f77STao Ma struct ext4_xattr_info *i, 9760d812f77STao Ma struct ext4_xattr_ibody_find *is) 9770d812f77STao Ma { 9780d812f77STao Ma struct ext4_xattr_ibody_header *header; 9790d812f77STao Ma struct ext4_xattr_search *s = &is->s; 9800d812f77STao Ma int error; 9810d812f77STao Ma 9820d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 9830d812f77STao Ma return -ENOSPC; 9840d812f77STao Ma error = ext4_xattr_set_entry(i, s); 9850d812f77STao Ma if (error) { 9860d812f77STao Ma if (error == -ENOSPC && 9870d812f77STao Ma ext4_has_inline_data(inode)) { 9880d812f77STao Ma error = ext4_try_to_evict_inline_data(handle, inode, 9890d812f77STao Ma EXT4_XATTR_LEN(strlen(i->name) + 9900d812f77STao Ma EXT4_XATTR_SIZE(i->value_len))); 9910d812f77STao Ma if (error) 9920d812f77STao Ma return error; 9930d812f77STao Ma error = ext4_xattr_ibody_find(inode, i, is); 9940d812f77STao Ma if (error) 9950d812f77STao Ma return error; 9960d812f77STao Ma error = ext4_xattr_set_entry(i, s); 9970d812f77STao Ma } 9980d812f77STao Ma if (error) 9990d812f77STao Ma return error; 10000d812f77STao Ma } 10010d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 10020d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 10030d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 10040d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 10050d812f77STao Ma } else { 10060d812f77STao Ma header->h_magic = cpu_to_le32(0); 10070d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 10080d812f77STao Ma } 10090d812f77STao Ma return 0; 10100d812f77STao Ma } 10110d812f77STao Ma 10120d812f77STao Ma static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 1013617ba13bSMingming Cao struct ext4_xattr_info *i, 1014617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 1015ac27a0ecSDave Kleikamp { 1016617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 1017617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 1018ac27a0ecSDave Kleikamp int error; 1019ac27a0ecSDave Kleikamp 1020617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 1021ac27a0ecSDave Kleikamp return -ENOSPC; 1022617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 1023ac27a0ecSDave Kleikamp if (error) 1024ac27a0ecSDave Kleikamp return error; 1025617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 1026ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 1027617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 102819f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 1029ac27a0ecSDave Kleikamp } else { 1030ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 103119f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 1032ac27a0ecSDave Kleikamp } 1033ac27a0ecSDave Kleikamp return 0; 1034ac27a0ecSDave Kleikamp } 1035ac27a0ecSDave Kleikamp 1036ac27a0ecSDave Kleikamp /* 1037617ba13bSMingming Cao * ext4_xattr_set_handle() 1038ac27a0ecSDave Kleikamp * 10396e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 1040ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 1041ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 1042ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 1043ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 1044ac27a0ecSDave Kleikamp * previous to the call, respectively. 1045ac27a0ecSDave Kleikamp * 1046ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1047ac27a0ecSDave Kleikamp */ 1048ac27a0ecSDave Kleikamp int 1049617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 1050ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 1051ac27a0ecSDave Kleikamp int flags) 1052ac27a0ecSDave Kleikamp { 1053617ba13bSMingming Cao struct ext4_xattr_info i = { 1054ac27a0ecSDave Kleikamp .name_index = name_index, 1055ac27a0ecSDave Kleikamp .name = name, 1056ac27a0ecSDave Kleikamp .value = value, 1057ac27a0ecSDave Kleikamp .value_len = value_len, 1058ac27a0ecSDave Kleikamp 1059ac27a0ecSDave Kleikamp }; 1060617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 1061ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1062ac27a0ecSDave Kleikamp }; 1063617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 1064ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1065ac27a0ecSDave Kleikamp }; 10664d20c685SKalpak Shah unsigned long no_expand; 1067ac27a0ecSDave Kleikamp int error; 1068ac27a0ecSDave Kleikamp 1069ac27a0ecSDave Kleikamp if (!name) 1070ac27a0ecSDave Kleikamp return -EINVAL; 1071ac27a0ecSDave Kleikamp if (strlen(name) > 255) 1072ac27a0ecSDave Kleikamp return -ERANGE; 1073617ba13bSMingming Cao down_write(&EXT4_I(inode)->xattr_sem); 107419f5fb7aSTheodore Ts'o no_expand = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND); 107519f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND); 10764d20c685SKalpak Shah 107766543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 107886ebfd08SEric Sandeen if (error) 107986ebfd08SEric Sandeen goto cleanup; 108086ebfd08SEric Sandeen 108119f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 1082617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 1083617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 108419f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 1085ac27a0ecSDave Kleikamp } 1086ac27a0ecSDave Kleikamp 1087617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 1088ac27a0ecSDave Kleikamp if (error) 1089ac27a0ecSDave Kleikamp goto cleanup; 1090ac27a0ecSDave Kleikamp if (is.s.not_found) 1091617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 1092ac27a0ecSDave Kleikamp if (error) 1093ac27a0ecSDave Kleikamp goto cleanup; 1094ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 1095ac27a0ecSDave Kleikamp error = -ENODATA; 1096ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 1097ac27a0ecSDave Kleikamp goto cleanup; 1098ac27a0ecSDave Kleikamp error = 0; 1099ac27a0ecSDave Kleikamp if (!value) 1100ac27a0ecSDave Kleikamp goto cleanup; 1101ac27a0ecSDave Kleikamp } else { 1102ac27a0ecSDave Kleikamp error = -EEXIST; 1103ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 1104ac27a0ecSDave Kleikamp goto cleanup; 1105ac27a0ecSDave Kleikamp } 1106ac27a0ecSDave Kleikamp if (!value) { 1107ac27a0ecSDave Kleikamp if (!is.s.not_found) 1108617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1109ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 1110617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1111ac27a0ecSDave Kleikamp } else { 1112617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1113ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 1114ac27a0ecSDave Kleikamp i.value = NULL; 1115617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1116ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 11177e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 11187e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 11197e01c8e5STiger Yang if (error) 11207e01c8e5STiger Yang goto cleanup; 11217e01c8e5STiger Yang } 1122617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1123ac27a0ecSDave Kleikamp if (error) 1124ac27a0ecSDave Kleikamp goto cleanup; 1125ac27a0ecSDave Kleikamp if (!is.s.not_found) { 1126ac27a0ecSDave Kleikamp i.value = NULL; 1127617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, 1128ac27a0ecSDave Kleikamp &is); 1129ac27a0ecSDave Kleikamp } 1130ac27a0ecSDave Kleikamp } 1131ac27a0ecSDave Kleikamp } 1132ac27a0ecSDave Kleikamp if (!error) { 1133617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 1134ef7f3835SKalpak Shah inode->i_ctime = ext4_current_time(inode); 11356dd4ee7cSKalpak Shah if (!value) 113619f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); 1137617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 1138ac27a0ecSDave Kleikamp /* 1139617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 1140ac27a0ecSDave Kleikamp * error != 0. 1141ac27a0ecSDave Kleikamp */ 1142ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 1143ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 11440390131bSFrank Mayhar ext4_handle_sync(handle); 1145ac27a0ecSDave Kleikamp } 1146ac27a0ecSDave Kleikamp 1147ac27a0ecSDave Kleikamp cleanup: 1148ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 1149ac27a0ecSDave Kleikamp brelse(bs.bh); 11504d20c685SKalpak Shah if (no_expand == 0) 115119f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); 1152617ba13bSMingming Cao up_write(&EXT4_I(inode)->xattr_sem); 1153ac27a0ecSDave Kleikamp return error; 1154ac27a0ecSDave Kleikamp } 1155ac27a0ecSDave Kleikamp 1156ac27a0ecSDave Kleikamp /* 1157617ba13bSMingming Cao * ext4_xattr_set() 1158ac27a0ecSDave Kleikamp * 1159617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 1160ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 1161ac27a0ecSDave Kleikamp * 1162ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1163ac27a0ecSDave Kleikamp */ 1164ac27a0ecSDave Kleikamp int 1165617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 1166ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 1167ac27a0ecSDave Kleikamp { 1168ac27a0ecSDave Kleikamp handle_t *handle; 1169ac27a0ecSDave Kleikamp int error, retries = 0; 117095eaefbdSTheodore Ts'o int credits = ext4_jbd2_credits_xattr(inode); 1171ac27a0ecSDave Kleikamp 1172ac27a0ecSDave Kleikamp retry: 11739924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 1174ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 1175ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 1176ac27a0ecSDave Kleikamp } else { 1177ac27a0ecSDave Kleikamp int error2; 1178ac27a0ecSDave Kleikamp 1179617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 1180ac27a0ecSDave Kleikamp value, value_len, flags); 1181617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 1182ac27a0ecSDave Kleikamp if (error == -ENOSPC && 1183617ba13bSMingming Cao ext4_should_retry_alloc(inode->i_sb, &retries)) 1184ac27a0ecSDave Kleikamp goto retry; 1185ac27a0ecSDave Kleikamp if (error == 0) 1186ac27a0ecSDave Kleikamp error = error2; 1187ac27a0ecSDave Kleikamp } 1188ac27a0ecSDave Kleikamp 1189ac27a0ecSDave Kleikamp return error; 1190ac27a0ecSDave Kleikamp } 1191ac27a0ecSDave Kleikamp 1192ac27a0ecSDave Kleikamp /* 11936dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 11946dd4ee7cSKalpak Shah * i_extra_isize. 11956dd4ee7cSKalpak Shah */ 11966dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 11976dd4ee7cSKalpak Shah int value_offs_shift, void *to, 11986dd4ee7cSKalpak Shah void *from, size_t n, int blocksize) 11996dd4ee7cSKalpak Shah { 12006dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 12016dd4ee7cSKalpak Shah int new_offs; 12026dd4ee7cSKalpak Shah 12036dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 12046dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 12056dd4ee7cSKalpak Shah if (!last->e_value_block && last->e_value_size) { 12066dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 12076dd4ee7cSKalpak Shah value_offs_shift; 12086dd4ee7cSKalpak Shah BUG_ON(new_offs + le32_to_cpu(last->e_value_size) 12096dd4ee7cSKalpak Shah > blocksize); 12106dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 12116dd4ee7cSKalpak Shah } 12126dd4ee7cSKalpak Shah } 12136dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 12146dd4ee7cSKalpak Shah memmove(to, from, n); 12156dd4ee7cSKalpak Shah } 12166dd4ee7cSKalpak Shah 12176dd4ee7cSKalpak Shah /* 12186dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 12196dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 12206dd4ee7cSKalpak Shah */ 12216dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 12226dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 12236dd4ee7cSKalpak Shah { 12246dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 12256dd4ee7cSKalpak Shah struct ext4_xattr_entry *entry, *last, *first; 12266dd4ee7cSKalpak Shah struct buffer_head *bh = NULL; 12276dd4ee7cSKalpak Shah struct ext4_xattr_ibody_find *is = NULL; 12286dd4ee7cSKalpak Shah struct ext4_xattr_block_find *bs = NULL; 12296dd4ee7cSKalpak Shah char *buffer = NULL, *b_entry_name = NULL; 12306dd4ee7cSKalpak Shah size_t min_offs, free; 12316dd4ee7cSKalpak Shah int total_ino, total_blk; 12326dd4ee7cSKalpak Shah void *base, *start, *end; 12336dd4ee7cSKalpak Shah int extra_isize = 0, error = 0, tried_min_extra_isize = 0; 1234ac39849dSAneesh Kumar K.V int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); 12356dd4ee7cSKalpak Shah 12366dd4ee7cSKalpak Shah down_write(&EXT4_I(inode)->xattr_sem); 12376dd4ee7cSKalpak Shah retry: 12386dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) { 12396dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 12406dd4ee7cSKalpak Shah return 0; 12416dd4ee7cSKalpak Shah } 12426dd4ee7cSKalpak Shah 12436dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 12446dd4ee7cSKalpak Shah entry = IFIRST(header); 12456dd4ee7cSKalpak Shah 12466dd4ee7cSKalpak Shah /* 12476dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 12486dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 12496dd4ee7cSKalpak Shah */ 12506dd4ee7cSKalpak Shah 12516dd4ee7cSKalpak Shah base = start = entry; 12526dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 12536dd4ee7cSKalpak Shah min_offs = end - base; 12546dd4ee7cSKalpak Shah last = entry; 12556dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 12566dd4ee7cSKalpak Shah 12576dd4ee7cSKalpak Shah free = ext4_xattr_free_space(last, &min_offs, base, &total_ino); 12586dd4ee7cSKalpak Shah if (free >= new_extra_isize) { 12596dd4ee7cSKalpak Shah entry = IFIRST(header); 12606dd4ee7cSKalpak Shah ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize 12616dd4ee7cSKalpak Shah - new_extra_isize, (void *)raw_inode + 12626dd4ee7cSKalpak Shah EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 12636dd4ee7cSKalpak Shah (void *)header, total_ino, 12646dd4ee7cSKalpak Shah inode->i_sb->s_blocksize); 12656dd4ee7cSKalpak Shah EXT4_I(inode)->i_extra_isize = new_extra_isize; 12666dd4ee7cSKalpak Shah error = 0; 12676dd4ee7cSKalpak Shah goto cleanup; 12686dd4ee7cSKalpak Shah } 12696dd4ee7cSKalpak Shah 12706dd4ee7cSKalpak Shah /* 12716dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 12726dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 12736dd4ee7cSKalpak Shah */ 12746dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 12756dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 12766dd4ee7cSKalpak Shah error = -EIO; 12776dd4ee7cSKalpak Shah if (!bh) 12786dd4ee7cSKalpak Shah goto cleanup; 1279cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 128024676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 128124676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 12826dd4ee7cSKalpak Shah error = -EIO; 12836dd4ee7cSKalpak Shah goto cleanup; 12846dd4ee7cSKalpak Shah } 12856dd4ee7cSKalpak Shah base = BHDR(bh); 12866dd4ee7cSKalpak Shah first = BFIRST(bh); 12876dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 12886dd4ee7cSKalpak Shah min_offs = end - base; 12896dd4ee7cSKalpak Shah free = ext4_xattr_free_space(first, &min_offs, base, 12906dd4ee7cSKalpak Shah &total_blk); 12916dd4ee7cSKalpak Shah if (free < new_extra_isize) { 12926dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 12936dd4ee7cSKalpak Shah tried_min_extra_isize++; 12946dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 12956dd4ee7cSKalpak Shah brelse(bh); 12966dd4ee7cSKalpak Shah goto retry; 12976dd4ee7cSKalpak Shah } 12986dd4ee7cSKalpak Shah error = -1; 12996dd4ee7cSKalpak Shah goto cleanup; 13006dd4ee7cSKalpak Shah } 13016dd4ee7cSKalpak Shah } else { 13026dd4ee7cSKalpak Shah free = inode->i_sb->s_blocksize; 13036dd4ee7cSKalpak Shah } 13046dd4ee7cSKalpak Shah 13056dd4ee7cSKalpak Shah while (new_extra_isize > 0) { 13066dd4ee7cSKalpak Shah size_t offs, size, entry_size; 13076dd4ee7cSKalpak Shah struct ext4_xattr_entry *small_entry = NULL; 13086dd4ee7cSKalpak Shah struct ext4_xattr_info i = { 13096dd4ee7cSKalpak Shah .value = NULL, 13106dd4ee7cSKalpak Shah .value_len = 0, 13116dd4ee7cSKalpak Shah }; 13126dd4ee7cSKalpak Shah unsigned int total_size; /* EA entry size + value size */ 13136dd4ee7cSKalpak Shah unsigned int shift_bytes; /* No. of bytes to shift EAs by? */ 13146dd4ee7cSKalpak Shah unsigned int min_total_size = ~0U; 13156dd4ee7cSKalpak Shah 13166dd4ee7cSKalpak Shah is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 13176dd4ee7cSKalpak Shah bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 13186dd4ee7cSKalpak Shah if (!is || !bs) { 13196dd4ee7cSKalpak Shah error = -ENOMEM; 13206dd4ee7cSKalpak Shah goto cleanup; 13216dd4ee7cSKalpak Shah } 13226dd4ee7cSKalpak Shah 13236dd4ee7cSKalpak Shah is->s.not_found = -ENODATA; 13246dd4ee7cSKalpak Shah bs->s.not_found = -ENODATA; 13256dd4ee7cSKalpak Shah is->iloc.bh = NULL; 13266dd4ee7cSKalpak Shah bs->bh = NULL; 13276dd4ee7cSKalpak Shah 13286dd4ee7cSKalpak Shah last = IFIRST(header); 13296dd4ee7cSKalpak Shah /* Find the entry best suited to be pushed into EA block */ 13306dd4ee7cSKalpak Shah entry = NULL; 13316dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 13326dd4ee7cSKalpak Shah total_size = 13336dd4ee7cSKalpak Shah EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + 13346dd4ee7cSKalpak Shah EXT4_XATTR_LEN(last->e_name_len); 13356dd4ee7cSKalpak Shah if (total_size <= free && total_size < min_total_size) { 13366dd4ee7cSKalpak Shah if (total_size < new_extra_isize) { 13376dd4ee7cSKalpak Shah small_entry = last; 13386dd4ee7cSKalpak Shah } else { 13396dd4ee7cSKalpak Shah entry = last; 13406dd4ee7cSKalpak Shah min_total_size = total_size; 13416dd4ee7cSKalpak Shah } 13426dd4ee7cSKalpak Shah } 13436dd4ee7cSKalpak Shah } 13446dd4ee7cSKalpak Shah 13456dd4ee7cSKalpak Shah if (entry == NULL) { 13466dd4ee7cSKalpak Shah if (small_entry) { 13476dd4ee7cSKalpak Shah entry = small_entry; 13486dd4ee7cSKalpak Shah } else { 13496dd4ee7cSKalpak Shah if (!tried_min_extra_isize && 13506dd4ee7cSKalpak Shah s_min_extra_isize) { 13516dd4ee7cSKalpak Shah tried_min_extra_isize++; 13526dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 1353*6e4ea8e3SDave Jones kfree(is); is = NULL; 1354*6e4ea8e3SDave Jones kfree(bs); bs = NULL; 13556dd4ee7cSKalpak Shah goto retry; 13566dd4ee7cSKalpak Shah } 13576dd4ee7cSKalpak Shah error = -1; 13586dd4ee7cSKalpak Shah goto cleanup; 13596dd4ee7cSKalpak Shah } 13606dd4ee7cSKalpak Shah } 13616dd4ee7cSKalpak Shah offs = le16_to_cpu(entry->e_value_offs); 13626dd4ee7cSKalpak Shah size = le32_to_cpu(entry->e_value_size); 13636dd4ee7cSKalpak Shah entry_size = EXT4_XATTR_LEN(entry->e_name_len); 13646dd4ee7cSKalpak Shah i.name_index = entry->e_name_index, 13656dd4ee7cSKalpak Shah buffer = kmalloc(EXT4_XATTR_SIZE(size), GFP_NOFS); 13666dd4ee7cSKalpak Shah b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 13676dd4ee7cSKalpak Shah if (!buffer || !b_entry_name) { 13686dd4ee7cSKalpak Shah error = -ENOMEM; 13696dd4ee7cSKalpak Shah goto cleanup; 13706dd4ee7cSKalpak Shah } 13716dd4ee7cSKalpak Shah /* Save the entry name and the entry value */ 13726dd4ee7cSKalpak Shah memcpy(buffer, (void *)IFIRST(header) + offs, 13736dd4ee7cSKalpak Shah EXT4_XATTR_SIZE(size)); 13746dd4ee7cSKalpak Shah memcpy(b_entry_name, entry->e_name, entry->e_name_len); 13756dd4ee7cSKalpak Shah b_entry_name[entry->e_name_len] = '\0'; 13766dd4ee7cSKalpak Shah i.name = b_entry_name; 13776dd4ee7cSKalpak Shah 13786dd4ee7cSKalpak Shah error = ext4_get_inode_loc(inode, &is->iloc); 13796dd4ee7cSKalpak Shah if (error) 13806dd4ee7cSKalpak Shah goto cleanup; 13816dd4ee7cSKalpak Shah 13826dd4ee7cSKalpak Shah error = ext4_xattr_ibody_find(inode, &i, is); 13836dd4ee7cSKalpak Shah if (error) 13846dd4ee7cSKalpak Shah goto cleanup; 13856dd4ee7cSKalpak Shah 13866dd4ee7cSKalpak Shah /* Remove the chosen entry from the inode */ 13876dd4ee7cSKalpak Shah error = ext4_xattr_ibody_set(handle, inode, &i, is); 13889aaab058SRoel Kluin if (error) 13899aaab058SRoel Kluin goto cleanup; 13906dd4ee7cSKalpak Shah 13916dd4ee7cSKalpak Shah entry = IFIRST(header); 13926dd4ee7cSKalpak Shah if (entry_size + EXT4_XATTR_SIZE(size) >= new_extra_isize) 13936dd4ee7cSKalpak Shah shift_bytes = new_extra_isize; 13946dd4ee7cSKalpak Shah else 13956dd4ee7cSKalpak Shah shift_bytes = entry_size + size; 13966dd4ee7cSKalpak Shah /* Adjust the offsets and shift the remaining entries ahead */ 13976dd4ee7cSKalpak Shah ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize - 13986dd4ee7cSKalpak Shah shift_bytes, (void *)raw_inode + 13996dd4ee7cSKalpak Shah EXT4_GOOD_OLD_INODE_SIZE + extra_isize + shift_bytes, 14006dd4ee7cSKalpak Shah (void *)header, total_ino - entry_size, 14016dd4ee7cSKalpak Shah inode->i_sb->s_blocksize); 14026dd4ee7cSKalpak Shah 14036dd4ee7cSKalpak Shah extra_isize += shift_bytes; 14046dd4ee7cSKalpak Shah new_extra_isize -= shift_bytes; 14056dd4ee7cSKalpak Shah EXT4_I(inode)->i_extra_isize = extra_isize; 14066dd4ee7cSKalpak Shah 14076dd4ee7cSKalpak Shah i.name = b_entry_name; 14086dd4ee7cSKalpak Shah i.value = buffer; 1409ac39849dSAneesh Kumar K.V i.value_len = size; 14106dd4ee7cSKalpak Shah error = ext4_xattr_block_find(inode, &i, bs); 14116dd4ee7cSKalpak Shah if (error) 14126dd4ee7cSKalpak Shah goto cleanup; 14136dd4ee7cSKalpak Shah 14146dd4ee7cSKalpak Shah /* Add entry which was removed from the inode into the block */ 14156dd4ee7cSKalpak Shah error = ext4_xattr_block_set(handle, inode, &i, bs); 14166dd4ee7cSKalpak Shah if (error) 14176dd4ee7cSKalpak Shah goto cleanup; 14186dd4ee7cSKalpak Shah kfree(b_entry_name); 14196dd4ee7cSKalpak Shah kfree(buffer); 1420d3533d72SJulia Lawall b_entry_name = NULL; 1421d3533d72SJulia Lawall buffer = NULL; 14226dd4ee7cSKalpak Shah brelse(is->iloc.bh); 14236dd4ee7cSKalpak Shah kfree(is); 14246dd4ee7cSKalpak Shah kfree(bs); 14256dd4ee7cSKalpak Shah } 14266dd4ee7cSKalpak Shah brelse(bh); 14276dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 14286dd4ee7cSKalpak Shah return 0; 14296dd4ee7cSKalpak Shah 14306dd4ee7cSKalpak Shah cleanup: 14316dd4ee7cSKalpak Shah kfree(b_entry_name); 14326dd4ee7cSKalpak Shah kfree(buffer); 14336dd4ee7cSKalpak Shah if (is) 14346dd4ee7cSKalpak Shah brelse(is->iloc.bh); 14356dd4ee7cSKalpak Shah kfree(is); 14366dd4ee7cSKalpak Shah kfree(bs); 14376dd4ee7cSKalpak Shah brelse(bh); 14386dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 14396dd4ee7cSKalpak Shah return error; 14406dd4ee7cSKalpak Shah } 14416dd4ee7cSKalpak Shah 14426dd4ee7cSKalpak Shah 14436dd4ee7cSKalpak Shah 14446dd4ee7cSKalpak Shah /* 1445617ba13bSMingming Cao * ext4_xattr_delete_inode() 1446ac27a0ecSDave Kleikamp * 1447ac27a0ecSDave Kleikamp * Free extended attribute resources associated with this inode. This 1448ac27a0ecSDave Kleikamp * is called immediately before an inode is freed. We have exclusive 1449ac27a0ecSDave Kleikamp * access to the inode. 1450ac27a0ecSDave Kleikamp */ 1451ac27a0ecSDave Kleikamp void 1452617ba13bSMingming Cao ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) 1453ac27a0ecSDave Kleikamp { 1454ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 1455ac27a0ecSDave Kleikamp 1456617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 1457ac27a0ecSDave Kleikamp goto cleanup; 1458617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 1459ac27a0ecSDave Kleikamp if (!bh) { 146024676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 146124676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1462ac27a0ecSDave Kleikamp goto cleanup; 1463ac27a0ecSDave Kleikamp } 1464617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 1465ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) { 146624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 146724676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1468ac27a0ecSDave Kleikamp goto cleanup; 1469ac27a0ecSDave Kleikamp } 1470617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bh); 1471617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 1472ac27a0ecSDave Kleikamp 1473ac27a0ecSDave Kleikamp cleanup: 1474ac27a0ecSDave Kleikamp brelse(bh); 1475ac27a0ecSDave Kleikamp } 1476ac27a0ecSDave Kleikamp 1477ac27a0ecSDave Kleikamp /* 1478617ba13bSMingming Cao * ext4_xattr_put_super() 1479ac27a0ecSDave Kleikamp * 1480ac27a0ecSDave Kleikamp * This is called when a file system is unmounted. 1481ac27a0ecSDave Kleikamp */ 1482ac27a0ecSDave Kleikamp void 1483617ba13bSMingming Cao ext4_xattr_put_super(struct super_block *sb) 1484ac27a0ecSDave Kleikamp { 1485ac27a0ecSDave Kleikamp mb_cache_shrink(sb->s_bdev); 1486ac27a0ecSDave Kleikamp } 1487ac27a0ecSDave Kleikamp 1488ac27a0ecSDave Kleikamp /* 1489617ba13bSMingming Cao * ext4_xattr_cache_insert() 1490ac27a0ecSDave Kleikamp * 1491ac27a0ecSDave Kleikamp * Create a new entry in the extended attribute cache, and insert 1492ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 1493ac27a0ecSDave Kleikamp * 1494ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1495ac27a0ecSDave Kleikamp */ 1496ac27a0ecSDave Kleikamp static void 1497617ba13bSMingming Cao ext4_xattr_cache_insert(struct buffer_head *bh) 1498ac27a0ecSDave Kleikamp { 1499ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(BHDR(bh)->h_hash); 1500ac27a0ecSDave Kleikamp struct mb_cache_entry *ce; 1501ac27a0ecSDave Kleikamp int error; 1502ac27a0ecSDave Kleikamp 1503335e92e8SJan Kara ce = mb_cache_entry_alloc(ext4_xattr_cache, GFP_NOFS); 1504ac27a0ecSDave Kleikamp if (!ce) { 1505ac27a0ecSDave Kleikamp ea_bdebug(bh, "out of memory"); 1506ac27a0ecSDave Kleikamp return; 1507ac27a0ecSDave Kleikamp } 15082aec7c52SAndreas Gruenbacher error = mb_cache_entry_insert(ce, bh->b_bdev, bh->b_blocknr, hash); 1509ac27a0ecSDave Kleikamp if (error) { 1510ac27a0ecSDave Kleikamp mb_cache_entry_free(ce); 1511ac27a0ecSDave Kleikamp if (error == -EBUSY) { 1512ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 1513ac27a0ecSDave Kleikamp error = 0; 1514ac27a0ecSDave Kleikamp } 1515ac27a0ecSDave Kleikamp } else { 1516ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 1517ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 1518ac27a0ecSDave Kleikamp } 1519ac27a0ecSDave Kleikamp } 1520ac27a0ecSDave Kleikamp 1521ac27a0ecSDave Kleikamp /* 1522617ba13bSMingming Cao * ext4_xattr_cmp() 1523ac27a0ecSDave Kleikamp * 1524ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 1525ac27a0ecSDave Kleikamp * 1526ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 1527ac27a0ecSDave Kleikamp * a negative error number on errors. 1528ac27a0ecSDave Kleikamp */ 1529ac27a0ecSDave Kleikamp static int 1530617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 1531617ba13bSMingming Cao struct ext4_xattr_header *header2) 1532ac27a0ecSDave Kleikamp { 1533617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 1534ac27a0ecSDave Kleikamp 1535ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 1536ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 1537ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 1538ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 1539ac27a0ecSDave Kleikamp return 1; 1540ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 1541ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 1542ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 1543ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 1544ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 1545ac27a0ecSDave Kleikamp return 1; 1546ac27a0ecSDave Kleikamp if (entry1->e_value_block != 0 || entry2->e_value_block != 0) 1547ac27a0ecSDave Kleikamp return -EIO; 1548ac27a0ecSDave Kleikamp if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 1549ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 1550ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 1551ac27a0ecSDave Kleikamp return 1; 1552ac27a0ecSDave Kleikamp 1553617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 1554617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 1555ac27a0ecSDave Kleikamp } 1556ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 1557ac27a0ecSDave Kleikamp return 1; 1558ac27a0ecSDave Kleikamp return 0; 1559ac27a0ecSDave Kleikamp } 1560ac27a0ecSDave Kleikamp 1561ac27a0ecSDave Kleikamp /* 1562617ba13bSMingming Cao * ext4_xattr_cache_find() 1563ac27a0ecSDave Kleikamp * 1564ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 1565ac27a0ecSDave Kleikamp * 1566ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 1567ac27a0ecSDave Kleikamp * not found or an error occurred. 1568ac27a0ecSDave Kleikamp */ 1569ac27a0ecSDave Kleikamp static struct buffer_head * 1570617ba13bSMingming Cao ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, 1571ac27a0ecSDave Kleikamp struct mb_cache_entry **pce) 1572ac27a0ecSDave Kleikamp { 1573ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 1574ac27a0ecSDave Kleikamp struct mb_cache_entry *ce; 1575ac27a0ecSDave Kleikamp 1576ac27a0ecSDave Kleikamp if (!header->h_hash) 1577ac27a0ecSDave Kleikamp return NULL; /* never share */ 1578ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 1579ac27a0ecSDave Kleikamp again: 15802aec7c52SAndreas Gruenbacher ce = mb_cache_entry_find_first(ext4_xattr_cache, inode->i_sb->s_bdev, 15812aec7c52SAndreas Gruenbacher hash); 1582ac27a0ecSDave Kleikamp while (ce) { 1583ac27a0ecSDave Kleikamp struct buffer_head *bh; 1584ac27a0ecSDave Kleikamp 1585ac27a0ecSDave Kleikamp if (IS_ERR(ce)) { 1586ac27a0ecSDave Kleikamp if (PTR_ERR(ce) == -EAGAIN) 1587ac27a0ecSDave Kleikamp goto again; 1588ac27a0ecSDave Kleikamp break; 1589ac27a0ecSDave Kleikamp } 1590ac27a0ecSDave Kleikamp bh = sb_bread(inode->i_sb, ce->e_block); 1591ac27a0ecSDave Kleikamp if (!bh) { 159224676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 159324676da4STheodore Ts'o (unsigned long) ce->e_block); 1594ac27a0ecSDave Kleikamp } else if (le32_to_cpu(BHDR(bh)->h_refcount) >= 1595617ba13bSMingming Cao EXT4_XATTR_REFCOUNT_MAX) { 1596ac27a0ecSDave Kleikamp ea_idebug(inode, "block %lu refcount %d>=%d", 1597ac27a0ecSDave Kleikamp (unsigned long) ce->e_block, 1598ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount), 1599617ba13bSMingming Cao EXT4_XATTR_REFCOUNT_MAX); 1600617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 1601ac27a0ecSDave Kleikamp *pce = ce; 1602ac27a0ecSDave Kleikamp return bh; 1603ac27a0ecSDave Kleikamp } 1604ac27a0ecSDave Kleikamp brelse(bh); 16052aec7c52SAndreas Gruenbacher ce = mb_cache_entry_find_next(ce, inode->i_sb->s_bdev, hash); 1606ac27a0ecSDave Kleikamp } 1607ac27a0ecSDave Kleikamp return NULL; 1608ac27a0ecSDave Kleikamp } 1609ac27a0ecSDave Kleikamp 1610ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 1611ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 1612ac27a0ecSDave Kleikamp 1613ac27a0ecSDave Kleikamp /* 1614617ba13bSMingming Cao * ext4_xattr_hash_entry() 1615ac27a0ecSDave Kleikamp * 1616ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 1617ac27a0ecSDave Kleikamp */ 1618617ba13bSMingming Cao static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, 1619617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1620ac27a0ecSDave Kleikamp { 1621ac27a0ecSDave Kleikamp __u32 hash = 0; 1622ac27a0ecSDave Kleikamp char *name = entry->e_name; 1623ac27a0ecSDave Kleikamp int n; 1624ac27a0ecSDave Kleikamp 1625ac27a0ecSDave Kleikamp for (n = 0; n < entry->e_name_len; n++) { 1626ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 1627ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 1628ac27a0ecSDave Kleikamp *name++; 1629ac27a0ecSDave Kleikamp } 1630ac27a0ecSDave Kleikamp 1631ac27a0ecSDave Kleikamp if (entry->e_value_block == 0 && entry->e_value_size != 0) { 1632ac27a0ecSDave Kleikamp __le32 *value = (__le32 *)((char *)header + 1633ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs)); 1634ac27a0ecSDave Kleikamp for (n = (le32_to_cpu(entry->e_value_size) + 1635617ba13bSMingming Cao EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { 1636ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 1637ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 1638ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 1639ac27a0ecSDave Kleikamp } 1640ac27a0ecSDave Kleikamp } 1641ac27a0ecSDave Kleikamp entry->e_hash = cpu_to_le32(hash); 1642ac27a0ecSDave Kleikamp } 1643ac27a0ecSDave Kleikamp 1644ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 1645ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 1646ac27a0ecSDave Kleikamp 1647ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 1648ac27a0ecSDave Kleikamp 1649ac27a0ecSDave Kleikamp /* 1650617ba13bSMingming Cao * ext4_xattr_rehash() 1651ac27a0ecSDave Kleikamp * 1652ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 1653ac27a0ecSDave Kleikamp */ 1654617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *header, 1655617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1656ac27a0ecSDave Kleikamp { 1657617ba13bSMingming Cao struct ext4_xattr_entry *here; 1658ac27a0ecSDave Kleikamp __u32 hash = 0; 1659ac27a0ecSDave Kleikamp 1660617ba13bSMingming Cao ext4_xattr_hash_entry(header, entry); 1661ac27a0ecSDave Kleikamp here = ENTRY(header+1); 1662ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 1663ac27a0ecSDave Kleikamp if (!here->e_hash) { 1664ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 1665ac27a0ecSDave Kleikamp hash = 0; 1666ac27a0ecSDave Kleikamp break; 1667ac27a0ecSDave Kleikamp } 1668ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 1669ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 1670ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 1671617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 1672ac27a0ecSDave Kleikamp } 1673ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 1674ac27a0ecSDave Kleikamp } 1675ac27a0ecSDave Kleikamp 1676ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 1677ac27a0ecSDave Kleikamp 1678ac27a0ecSDave Kleikamp int __init 16795dabfc78STheodore Ts'o ext4_init_xattr(void) 1680ac27a0ecSDave Kleikamp { 16812aec7c52SAndreas Gruenbacher ext4_xattr_cache = mb_cache_create("ext4_xattr", 6); 1682617ba13bSMingming Cao if (!ext4_xattr_cache) 1683ac27a0ecSDave Kleikamp return -ENOMEM; 1684ac27a0ecSDave Kleikamp return 0; 1685ac27a0ecSDave Kleikamp } 1686ac27a0ecSDave Kleikamp 1687ac27a0ecSDave Kleikamp void 16885dabfc78STheodore Ts'o ext4_exit_xattr(void) 1689ac27a0ecSDave Kleikamp { 1690617ba13bSMingming Cao if (ext4_xattr_cache) 1691617ba13bSMingming Cao mb_cache_destroy(ext4_xattr_cache); 1692617ba13bSMingming Cao ext4_xattr_cache = NULL; 1693ac27a0ecSDave Kleikamp } 1694