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); 125cc8e94fdSDarrick J. Wong __u32 csum, old; 126cc8e94fdSDarrick J. Wong 127cc8e94fdSDarrick J. Wong old = hdr->h_checksum; 128cc8e94fdSDarrick J. Wong hdr->h_checksum = 0; 129cc8e94fdSDarrick J. Wong block_nr = cpu_to_le64(block_nr); 130cc8e94fdSDarrick J. Wong csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&block_nr, 131cc8e94fdSDarrick J. Wong sizeof(block_nr)); 132cc8e94fdSDarrick J. Wong csum = ext4_chksum(sbi, csum, (__u8 *)hdr, 133cc8e94fdSDarrick J. Wong EXT4_BLOCK_SIZE(inode->i_sb)); 13441eb70ddSTao Ma 135cc8e94fdSDarrick J. Wong hdr->h_checksum = old; 136cc8e94fdSDarrick J. Wong return cpu_to_le32(csum); 137cc8e94fdSDarrick J. Wong } 138cc8e94fdSDarrick J. Wong 139cc8e94fdSDarrick J. Wong static int ext4_xattr_block_csum_verify(struct inode *inode, 140cc8e94fdSDarrick J. Wong sector_t block_nr, 141cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 142cc8e94fdSDarrick J. Wong { 143cc8e94fdSDarrick J. Wong if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, 144cc8e94fdSDarrick J. Wong EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && 145cc8e94fdSDarrick J. Wong (hdr->h_checksum != ext4_xattr_block_csum(inode, block_nr, hdr))) 146cc8e94fdSDarrick J. Wong return 0; 147cc8e94fdSDarrick J. Wong return 1; 148cc8e94fdSDarrick J. Wong } 149cc8e94fdSDarrick J. Wong 150cc8e94fdSDarrick J. Wong static void ext4_xattr_block_csum_set(struct inode *inode, 151cc8e94fdSDarrick J. Wong sector_t block_nr, 152cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 153cc8e94fdSDarrick J. Wong { 154cc8e94fdSDarrick J. Wong if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, 155cc8e94fdSDarrick J. Wong EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) 156cc8e94fdSDarrick J. Wong return; 157cc8e94fdSDarrick J. Wong 158cc8e94fdSDarrick J. Wong hdr->h_checksum = ext4_xattr_block_csum(inode, block_nr, hdr); 159cc8e94fdSDarrick J. Wong } 160cc8e94fdSDarrick J. Wong 161cc8e94fdSDarrick J. Wong static inline int ext4_handle_dirty_xattr_block(handle_t *handle, 162cc8e94fdSDarrick J. Wong struct inode *inode, 163cc8e94fdSDarrick J. Wong struct buffer_head *bh) 164cc8e94fdSDarrick J. Wong { 165cc8e94fdSDarrick J. Wong ext4_xattr_block_csum_set(inode, bh->b_blocknr, BHDR(bh)); 166cc8e94fdSDarrick J. Wong return ext4_handle_dirty_metadata(handle, inode, bh); 167cc8e94fdSDarrick J. Wong } 168cc8e94fdSDarrick J. Wong 16911e27528SStephen Hemminger static inline const struct xattr_handler * 170617ba13bSMingming Cao ext4_xattr_handler(int name_index) 171ac27a0ecSDave Kleikamp { 17211e27528SStephen Hemminger const struct xattr_handler *handler = NULL; 173ac27a0ecSDave Kleikamp 174617ba13bSMingming Cao if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) 175617ba13bSMingming Cao handler = ext4_xattr_handler_map[name_index]; 176ac27a0ecSDave Kleikamp return handler; 177ac27a0ecSDave Kleikamp } 178ac27a0ecSDave Kleikamp 179ac27a0ecSDave Kleikamp /* 180ac27a0ecSDave Kleikamp * Inode operation listxattr() 181ac27a0ecSDave Kleikamp * 182ac27a0ecSDave Kleikamp * dentry->d_inode->i_mutex: don't care 183ac27a0ecSDave Kleikamp */ 184ac27a0ecSDave Kleikamp ssize_t 185617ba13bSMingming Cao ext4_listxattr(struct dentry *dentry, char *buffer, size_t size) 186ac27a0ecSDave Kleikamp { 187431547b3SChristoph Hellwig return ext4_xattr_list(dentry, buffer, size); 188ac27a0ecSDave Kleikamp } 189ac27a0ecSDave Kleikamp 190ac27a0ecSDave Kleikamp static int 191617ba13bSMingming Cao ext4_xattr_check_names(struct ext4_xattr_entry *entry, void *end) 192ac27a0ecSDave Kleikamp { 193ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry)) { 194617ba13bSMingming Cao struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(entry); 195ac27a0ecSDave Kleikamp if ((void *)next >= end) 196ac27a0ecSDave Kleikamp return -EIO; 197ac27a0ecSDave Kleikamp entry = next; 198ac27a0ecSDave Kleikamp } 199ac27a0ecSDave Kleikamp return 0; 200ac27a0ecSDave Kleikamp } 201ac27a0ecSDave Kleikamp 202ac27a0ecSDave Kleikamp static inline int 203cc8e94fdSDarrick J. Wong ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) 204ac27a0ecSDave Kleikamp { 205cc8e94fdSDarrick J. Wong int error; 206cc8e94fdSDarrick J. Wong 207cc8e94fdSDarrick J. Wong if (buffer_verified(bh)) 208cc8e94fdSDarrick J. Wong return 0; 209cc8e94fdSDarrick J. Wong 210617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 211ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) 212ac27a0ecSDave Kleikamp return -EIO; 213cc8e94fdSDarrick J. Wong if (!ext4_xattr_block_csum_verify(inode, bh->b_blocknr, BHDR(bh))) 214cc8e94fdSDarrick J. Wong return -EIO; 215cc8e94fdSDarrick J. Wong error = ext4_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size); 216cc8e94fdSDarrick J. Wong if (!error) 217cc8e94fdSDarrick J. Wong set_buffer_verified(bh); 218cc8e94fdSDarrick J. Wong return error; 219ac27a0ecSDave Kleikamp } 220ac27a0ecSDave Kleikamp 221ac27a0ecSDave Kleikamp static inline int 222617ba13bSMingming Cao ext4_xattr_check_entry(struct ext4_xattr_entry *entry, size_t size) 223ac27a0ecSDave Kleikamp { 224ac27a0ecSDave Kleikamp size_t value_size = le32_to_cpu(entry->e_value_size); 225ac27a0ecSDave Kleikamp 226ac27a0ecSDave Kleikamp if (entry->e_value_block != 0 || value_size > size || 227ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs) + value_size > size) 228ac27a0ecSDave Kleikamp return -EIO; 229ac27a0ecSDave Kleikamp return 0; 230ac27a0ecSDave Kleikamp } 231ac27a0ecSDave Kleikamp 232ac27a0ecSDave Kleikamp static int 233617ba13bSMingming Cao ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, 234ac27a0ecSDave Kleikamp const char *name, size_t size, int sorted) 235ac27a0ecSDave Kleikamp { 236617ba13bSMingming Cao struct ext4_xattr_entry *entry; 237ac27a0ecSDave Kleikamp size_t name_len; 238ac27a0ecSDave Kleikamp int cmp = 1; 239ac27a0ecSDave Kleikamp 240ac27a0ecSDave Kleikamp if (name == NULL) 241ac27a0ecSDave Kleikamp return -EINVAL; 242ac27a0ecSDave Kleikamp name_len = strlen(name); 243ac27a0ecSDave Kleikamp entry = *pentry; 244617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 245ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 246ac27a0ecSDave Kleikamp if (!cmp) 247ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 248ac27a0ecSDave Kleikamp if (!cmp) 249ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 250ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 251ac27a0ecSDave Kleikamp break; 252ac27a0ecSDave Kleikamp } 253ac27a0ecSDave Kleikamp *pentry = entry; 254617ba13bSMingming Cao if (!cmp && ext4_xattr_check_entry(entry, size)) 255ac27a0ecSDave Kleikamp return -EIO; 256ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 257ac27a0ecSDave Kleikamp } 258ac27a0ecSDave Kleikamp 259ac27a0ecSDave Kleikamp static int 260617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 261ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 262ac27a0ecSDave Kleikamp { 263ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 264617ba13bSMingming Cao struct ext4_xattr_entry *entry; 265ac27a0ecSDave Kleikamp size_t size; 266ac27a0ecSDave Kleikamp int error; 267ac27a0ecSDave Kleikamp 268ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 269ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 270ac27a0ecSDave Kleikamp 271ac27a0ecSDave Kleikamp error = -ENODATA; 272617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 273ac27a0ecSDave Kleikamp goto cleanup; 274ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 275ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 276617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 277ac27a0ecSDave Kleikamp if (!bh) 278ac27a0ecSDave Kleikamp goto cleanup; 279ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 280ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 281cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 28212062dddSEric Sandeen bad_block: 28324676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 284617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 285ac27a0ecSDave Kleikamp error = -EIO; 286ac27a0ecSDave Kleikamp goto cleanup; 287ac27a0ecSDave Kleikamp } 288617ba13bSMingming Cao ext4_xattr_cache_insert(bh); 289ac27a0ecSDave Kleikamp entry = BFIRST(bh); 290617ba13bSMingming Cao error = ext4_xattr_find_entry(&entry, name_index, name, bh->b_size, 1); 291ac27a0ecSDave Kleikamp if (error == -EIO) 292ac27a0ecSDave Kleikamp goto bad_block; 293ac27a0ecSDave Kleikamp if (error) 294ac27a0ecSDave Kleikamp goto cleanup; 295ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 296ac27a0ecSDave Kleikamp if (buffer) { 297ac27a0ecSDave Kleikamp error = -ERANGE; 298ac27a0ecSDave Kleikamp if (size > buffer_size) 299ac27a0ecSDave Kleikamp goto cleanup; 300ac27a0ecSDave Kleikamp memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs), 301ac27a0ecSDave Kleikamp size); 302ac27a0ecSDave Kleikamp } 303ac27a0ecSDave Kleikamp error = size; 304ac27a0ecSDave Kleikamp 305ac27a0ecSDave Kleikamp cleanup: 306ac27a0ecSDave Kleikamp brelse(bh); 307ac27a0ecSDave Kleikamp return error; 308ac27a0ecSDave Kleikamp } 309ac27a0ecSDave Kleikamp 310*879b3825STao Ma int 311617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 312ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 313ac27a0ecSDave Kleikamp { 314617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 315617ba13bSMingming Cao struct ext4_xattr_entry *entry; 316617ba13bSMingming Cao struct ext4_inode *raw_inode; 317617ba13bSMingming Cao struct ext4_iloc iloc; 318ac27a0ecSDave Kleikamp size_t size; 319ac27a0ecSDave Kleikamp void *end; 320ac27a0ecSDave Kleikamp int error; 321ac27a0ecSDave Kleikamp 32219f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 323ac27a0ecSDave Kleikamp return -ENODATA; 324617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 325ac27a0ecSDave Kleikamp if (error) 326ac27a0ecSDave Kleikamp return error; 327617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 328ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 329ac27a0ecSDave Kleikamp entry = IFIRST(header); 330617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 331617ba13bSMingming Cao error = ext4_xattr_check_names(entry, end); 332ac27a0ecSDave Kleikamp if (error) 333ac27a0ecSDave Kleikamp goto cleanup; 334617ba13bSMingming Cao error = ext4_xattr_find_entry(&entry, name_index, name, 335ac27a0ecSDave Kleikamp end - (void *)entry, 0); 336ac27a0ecSDave Kleikamp if (error) 337ac27a0ecSDave Kleikamp goto cleanup; 338ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 339ac27a0ecSDave Kleikamp if (buffer) { 340ac27a0ecSDave Kleikamp error = -ERANGE; 341ac27a0ecSDave Kleikamp if (size > buffer_size) 342ac27a0ecSDave Kleikamp goto cleanup; 343ac27a0ecSDave Kleikamp memcpy(buffer, (void *)IFIRST(header) + 344ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs), size); 345ac27a0ecSDave Kleikamp } 346ac27a0ecSDave Kleikamp error = size; 347ac27a0ecSDave Kleikamp 348ac27a0ecSDave Kleikamp cleanup: 349ac27a0ecSDave Kleikamp brelse(iloc.bh); 350ac27a0ecSDave Kleikamp return error; 351ac27a0ecSDave Kleikamp } 352ac27a0ecSDave Kleikamp 353ac27a0ecSDave Kleikamp /* 354617ba13bSMingming Cao * ext4_xattr_get() 355ac27a0ecSDave Kleikamp * 356ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 357ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 358ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 359ac27a0ecSDave Kleikamp * 360ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 361ac27a0ecSDave Kleikamp * used / required on success. 362ac27a0ecSDave Kleikamp */ 363ac27a0ecSDave Kleikamp int 364617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 365ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 366ac27a0ecSDave Kleikamp { 367ac27a0ecSDave Kleikamp int error; 368ac27a0ecSDave Kleikamp 369617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 370617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 371ac27a0ecSDave Kleikamp buffer_size); 372ac27a0ecSDave Kleikamp if (error == -ENODATA) 373617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 374ac27a0ecSDave Kleikamp buffer_size); 375617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 376ac27a0ecSDave Kleikamp return error; 377ac27a0ecSDave Kleikamp } 378ac27a0ecSDave Kleikamp 379ac27a0ecSDave Kleikamp static int 380431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 381ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 382ac27a0ecSDave Kleikamp { 383ac27a0ecSDave Kleikamp size_t rest = buffer_size; 384ac27a0ecSDave Kleikamp 385617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 38611e27528SStephen Hemminger const struct xattr_handler *handler = 387617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 388ac27a0ecSDave Kleikamp 389ac27a0ecSDave Kleikamp if (handler) { 390431547b3SChristoph Hellwig size_t size = handler->list(dentry, buffer, rest, 391ac27a0ecSDave Kleikamp entry->e_name, 392431547b3SChristoph Hellwig entry->e_name_len, 393431547b3SChristoph Hellwig handler->flags); 394ac27a0ecSDave Kleikamp if (buffer) { 395ac27a0ecSDave Kleikamp if (size > rest) 396ac27a0ecSDave Kleikamp return -ERANGE; 397ac27a0ecSDave Kleikamp buffer += size; 398ac27a0ecSDave Kleikamp } 399ac27a0ecSDave Kleikamp rest -= size; 400ac27a0ecSDave Kleikamp } 401ac27a0ecSDave Kleikamp } 402ac27a0ecSDave Kleikamp return buffer_size - rest; 403ac27a0ecSDave Kleikamp } 404ac27a0ecSDave Kleikamp 405ac27a0ecSDave Kleikamp static int 406431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 407ac27a0ecSDave Kleikamp { 408431547b3SChristoph Hellwig struct inode *inode = dentry->d_inode; 409ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 410ac27a0ecSDave Kleikamp int error; 411ac27a0ecSDave Kleikamp 412ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 413ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 414ac27a0ecSDave Kleikamp 415ac27a0ecSDave Kleikamp error = 0; 416617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 417ac27a0ecSDave Kleikamp goto cleanup; 418ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 419ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 420617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 421ac27a0ecSDave Kleikamp error = -EIO; 422ac27a0ecSDave Kleikamp if (!bh) 423ac27a0ecSDave Kleikamp goto cleanup; 424ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 425ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 426cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 42724676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 428617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 429ac27a0ecSDave Kleikamp error = -EIO; 430ac27a0ecSDave Kleikamp goto cleanup; 431ac27a0ecSDave Kleikamp } 432617ba13bSMingming Cao ext4_xattr_cache_insert(bh); 433431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); 434ac27a0ecSDave Kleikamp 435ac27a0ecSDave Kleikamp cleanup: 436ac27a0ecSDave Kleikamp brelse(bh); 437ac27a0ecSDave Kleikamp 438ac27a0ecSDave Kleikamp return error; 439ac27a0ecSDave Kleikamp } 440ac27a0ecSDave Kleikamp 441ac27a0ecSDave Kleikamp static int 442431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 443ac27a0ecSDave Kleikamp { 444431547b3SChristoph Hellwig struct inode *inode = dentry->d_inode; 445617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 446617ba13bSMingming Cao struct ext4_inode *raw_inode; 447617ba13bSMingming Cao struct ext4_iloc iloc; 448ac27a0ecSDave Kleikamp void *end; 449ac27a0ecSDave Kleikamp int error; 450ac27a0ecSDave Kleikamp 45119f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 452ac27a0ecSDave Kleikamp return 0; 453617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 454ac27a0ecSDave Kleikamp if (error) 455ac27a0ecSDave Kleikamp return error; 456617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 457ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 458617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 459617ba13bSMingming Cao error = ext4_xattr_check_names(IFIRST(header), end); 460ac27a0ecSDave Kleikamp if (error) 461ac27a0ecSDave Kleikamp goto cleanup; 462431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 463ac27a0ecSDave Kleikamp buffer, buffer_size); 464ac27a0ecSDave Kleikamp 465ac27a0ecSDave Kleikamp cleanup: 466ac27a0ecSDave Kleikamp brelse(iloc.bh); 467ac27a0ecSDave Kleikamp return error; 468ac27a0ecSDave Kleikamp } 469ac27a0ecSDave Kleikamp 470ac27a0ecSDave Kleikamp /* 471617ba13bSMingming Cao * ext4_xattr_list() 472ac27a0ecSDave Kleikamp * 473ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 474ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 475ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 476ac27a0ecSDave Kleikamp * 477ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 478ac27a0ecSDave Kleikamp * used / required on success. 479ac27a0ecSDave Kleikamp */ 480d3a95d47SMingming Cao static int 481431547b3SChristoph Hellwig ext4_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size) 482ac27a0ecSDave Kleikamp { 483eaeef867STheodore Ts'o int ret, ret2; 484ac27a0ecSDave Kleikamp 485431547b3SChristoph Hellwig down_read(&EXT4_I(dentry->d_inode)->xattr_sem); 486eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 487eaeef867STheodore Ts'o if (ret < 0) 488eaeef867STheodore Ts'o goto errout; 489ac27a0ecSDave Kleikamp if (buffer) { 490eaeef867STheodore Ts'o buffer += ret; 491eaeef867STheodore Ts'o buffer_size -= ret; 492ac27a0ecSDave Kleikamp } 493eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 494eaeef867STheodore Ts'o if (ret < 0) 495eaeef867STheodore Ts'o goto errout; 496eaeef867STheodore Ts'o ret += ret2; 497eaeef867STheodore Ts'o errout: 498431547b3SChristoph Hellwig up_read(&EXT4_I(dentry->d_inode)->xattr_sem); 499eaeef867STheodore Ts'o return ret; 500ac27a0ecSDave Kleikamp } 501ac27a0ecSDave Kleikamp 502ac27a0ecSDave Kleikamp /* 503617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 504ac27a0ecSDave Kleikamp * not set, set it. 505ac27a0ecSDave Kleikamp */ 506617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 507ac27a0ecSDave Kleikamp struct super_block *sb) 508ac27a0ecSDave Kleikamp { 509617ba13bSMingming Cao if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_EXT_ATTR)) 510ac27a0ecSDave Kleikamp return; 511ac27a0ecSDave Kleikamp 512617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 513ed2908f3SAndreas Gruenbacher EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_EXT_ATTR); 514a0375156STheodore Ts'o ext4_handle_dirty_super(handle, sb); 515ac27a0ecSDave Kleikamp } 516ac27a0ecSDave Kleikamp } 517ac27a0ecSDave Kleikamp 518ac27a0ecSDave Kleikamp /* 519ac27a0ecSDave Kleikamp * Release the xattr block BH: If the reference count is > 1, decrement 520ac27a0ecSDave Kleikamp * it; otherwise free the block. 521ac27a0ecSDave Kleikamp */ 522ac27a0ecSDave Kleikamp static void 523617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 524ac27a0ecSDave Kleikamp struct buffer_head *bh) 525ac27a0ecSDave Kleikamp { 526ac27a0ecSDave Kleikamp struct mb_cache_entry *ce = NULL; 5278a2bfdcbSMingming Cao int error = 0; 528ac27a0ecSDave Kleikamp 529617ba13bSMingming Cao ce = mb_cache_entry_get(ext4_xattr_cache, bh->b_bdev, bh->b_blocknr); 5308a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 5318a2bfdcbSMingming Cao if (error) 5328a2bfdcbSMingming Cao goto out; 5338a2bfdcbSMingming Cao 5348a2bfdcbSMingming Cao lock_buffer(bh); 535ac27a0ecSDave Kleikamp if (BHDR(bh)->h_refcount == cpu_to_le32(1)) { 536ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 537ac27a0ecSDave Kleikamp if (ce) 538ac27a0ecSDave Kleikamp mb_cache_entry_free(ce); 539ac27a0ecSDave Kleikamp get_bh(bh); 540e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 541e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 542e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 543c1bb05a6SEric Sandeen unlock_buffer(bh); 544ac27a0ecSDave Kleikamp } else { 545e8546d06SMarcin Slusarz le32_add_cpu(&BHDR(bh)->h_refcount, -1); 546c1bb05a6SEric Sandeen if (ce) 547c1bb05a6SEric Sandeen mb_cache_entry_release(ce); 548c1bb05a6SEric Sandeen unlock_buffer(bh); 549cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, inode, bh); 550ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 5510390131bSFrank Mayhar ext4_handle_sync(handle); 5525dd4056dSChristoph Hellwig dquot_free_block(inode, 1); 553ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 554ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 555ac27a0ecSDave Kleikamp } 5568a2bfdcbSMingming Cao out: 5578a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 5588a2bfdcbSMingming Cao return; 559ac27a0ecSDave Kleikamp } 560ac27a0ecSDave Kleikamp 5616dd4ee7cSKalpak Shah /* 5626dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 5636dd4ee7cSKalpak Shah * bytes used by EA entries. 5646dd4ee7cSKalpak Shah */ 5656dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 5666dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 5676dd4ee7cSKalpak Shah { 5686dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 5696dd4ee7cSKalpak Shah *total += EXT4_XATTR_LEN(last->e_name_len); 5706dd4ee7cSKalpak Shah if (!last->e_value_block && last->e_value_size) { 5716dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 5726dd4ee7cSKalpak Shah if (offs < *min_offs) 5736dd4ee7cSKalpak Shah *min_offs = offs; 5746dd4ee7cSKalpak Shah } 5756dd4ee7cSKalpak Shah } 5766dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 5776dd4ee7cSKalpak Shah } 5786dd4ee7cSKalpak Shah 579ac27a0ecSDave Kleikamp static int 580617ba13bSMingming Cao ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s) 581ac27a0ecSDave Kleikamp { 582617ba13bSMingming Cao struct ext4_xattr_entry *last; 583ac27a0ecSDave Kleikamp size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); 584ac27a0ecSDave Kleikamp 585ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 586ac27a0ecSDave Kleikamp last = s->first; 587617ba13bSMingming Cao for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 588ac27a0ecSDave Kleikamp if (!last->e_value_block && last->e_value_size) { 589ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 590ac27a0ecSDave Kleikamp if (offs < min_offs) 591ac27a0ecSDave Kleikamp min_offs = offs; 592ac27a0ecSDave Kleikamp } 593ac27a0ecSDave Kleikamp } 594ac27a0ecSDave Kleikamp free = min_offs - ((void *)last - s->base) - sizeof(__u32); 595ac27a0ecSDave Kleikamp if (!s->not_found) { 596ac27a0ecSDave Kleikamp if (!s->here->e_value_block && s->here->e_value_size) { 597ac27a0ecSDave Kleikamp size_t size = le32_to_cpu(s->here->e_value_size); 598617ba13bSMingming Cao free += EXT4_XATTR_SIZE(size); 599ac27a0ecSDave Kleikamp } 600617ba13bSMingming Cao free += EXT4_XATTR_LEN(name_len); 601ac27a0ecSDave Kleikamp } 602ac27a0ecSDave Kleikamp if (i->value) { 603617ba13bSMingming Cao if (free < EXT4_XATTR_SIZE(i->value_len) || 604617ba13bSMingming Cao free < EXT4_XATTR_LEN(name_len) + 605617ba13bSMingming Cao EXT4_XATTR_SIZE(i->value_len)) 606ac27a0ecSDave Kleikamp return -ENOSPC; 607ac27a0ecSDave Kleikamp } 608ac27a0ecSDave Kleikamp 609ac27a0ecSDave Kleikamp if (i->value && s->not_found) { 610ac27a0ecSDave Kleikamp /* Insert the new name. */ 611617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 612ac27a0ecSDave Kleikamp size_t rest = (void *)last - (void *)s->here + sizeof(__u32); 613ac27a0ecSDave Kleikamp memmove((void *)s->here + size, s->here, rest); 614ac27a0ecSDave Kleikamp memset(s->here, 0, size); 615ac27a0ecSDave Kleikamp s->here->e_name_index = i->name_index; 616ac27a0ecSDave Kleikamp s->here->e_name_len = name_len; 617ac27a0ecSDave Kleikamp memcpy(s->here->e_name, i->name, name_len); 618ac27a0ecSDave Kleikamp } else { 619ac27a0ecSDave Kleikamp if (!s->here->e_value_block && s->here->e_value_size) { 620ac27a0ecSDave Kleikamp void *first_val = s->base + min_offs; 621ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(s->here->e_value_offs); 622ac27a0ecSDave Kleikamp void *val = s->base + offs; 623617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE( 624ac27a0ecSDave Kleikamp le32_to_cpu(s->here->e_value_size)); 625ac27a0ecSDave Kleikamp 626617ba13bSMingming Cao if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { 627ac27a0ecSDave Kleikamp /* The old and the new value have the same 628ac27a0ecSDave Kleikamp size. Just replace. */ 629ac27a0ecSDave Kleikamp s->here->e_value_size = 630ac27a0ecSDave Kleikamp cpu_to_le32(i->value_len); 631617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 632617ba13bSMingming Cao EXT4_XATTR_PAD); /* Clear pad bytes. */ 633ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 634ac27a0ecSDave Kleikamp return 0; 635ac27a0ecSDave Kleikamp } 636ac27a0ecSDave Kleikamp 637ac27a0ecSDave Kleikamp /* Remove the old value. */ 638ac27a0ecSDave Kleikamp memmove(first_val + size, first_val, val - first_val); 639ac27a0ecSDave Kleikamp memset(first_val, 0, size); 640ac27a0ecSDave Kleikamp s->here->e_value_size = 0; 641ac27a0ecSDave Kleikamp s->here->e_value_offs = 0; 642ac27a0ecSDave Kleikamp min_offs += size; 643ac27a0ecSDave Kleikamp 644ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 645ac27a0ecSDave Kleikamp last = s->first; 646ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 647ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 648ac27a0ecSDave Kleikamp if (!last->e_value_block && 649ac27a0ecSDave Kleikamp last->e_value_size && o < offs) 650ac27a0ecSDave Kleikamp last->e_value_offs = 651ac27a0ecSDave Kleikamp cpu_to_le16(o + size); 652617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 653ac27a0ecSDave Kleikamp } 654ac27a0ecSDave Kleikamp } 655ac27a0ecSDave Kleikamp if (!i->value) { 656ac27a0ecSDave Kleikamp /* Remove the old name. */ 657617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 658ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 659ac27a0ecSDave Kleikamp memmove(s->here, (void *)s->here + size, 660ac27a0ecSDave Kleikamp (void *)last - (void *)s->here + sizeof(__u32)); 661ac27a0ecSDave Kleikamp memset(last, 0, size); 662ac27a0ecSDave Kleikamp } 663ac27a0ecSDave Kleikamp } 664ac27a0ecSDave Kleikamp 665ac27a0ecSDave Kleikamp if (i->value) { 666ac27a0ecSDave Kleikamp /* Insert the new value. */ 667ac27a0ecSDave Kleikamp s->here->e_value_size = cpu_to_le32(i->value_len); 668ac27a0ecSDave Kleikamp if (i->value_len) { 669617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE(i->value_len); 670ac27a0ecSDave Kleikamp void *val = s->base + min_offs - size; 671ac27a0ecSDave Kleikamp s->here->e_value_offs = cpu_to_le16(min_offs - size); 672617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 673617ba13bSMingming Cao EXT4_XATTR_PAD); /* Clear the pad bytes. */ 674ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 675ac27a0ecSDave Kleikamp } 676ac27a0ecSDave Kleikamp } 677ac27a0ecSDave Kleikamp return 0; 678ac27a0ecSDave Kleikamp } 679ac27a0ecSDave Kleikamp 680617ba13bSMingming Cao struct ext4_xattr_block_find { 681617ba13bSMingming Cao struct ext4_xattr_search s; 682ac27a0ecSDave Kleikamp struct buffer_head *bh; 683ac27a0ecSDave Kleikamp }; 684ac27a0ecSDave Kleikamp 685ac27a0ecSDave Kleikamp static int 686617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 687617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 688ac27a0ecSDave Kleikamp { 689ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 690ac27a0ecSDave Kleikamp int error; 691ac27a0ecSDave Kleikamp 692ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 693ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 694ac27a0ecSDave Kleikamp 695617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 696ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 697617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 698ac27a0ecSDave Kleikamp error = -EIO; 699ac27a0ecSDave Kleikamp if (!bs->bh) 700ac27a0ecSDave Kleikamp goto cleanup; 701ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 702ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 703ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 704cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bs->bh)) { 70524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 70624676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 707ac27a0ecSDave Kleikamp error = -EIO; 708ac27a0ecSDave Kleikamp goto cleanup; 709ac27a0ecSDave Kleikamp } 710ac27a0ecSDave Kleikamp /* Find the named attribute. */ 711ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 712ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 713ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 714ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 715617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 716ac27a0ecSDave Kleikamp i->name, bs->bh->b_size, 1); 717ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 718ac27a0ecSDave Kleikamp goto cleanup; 719ac27a0ecSDave Kleikamp bs->s.not_found = error; 720ac27a0ecSDave Kleikamp } 721ac27a0ecSDave Kleikamp error = 0; 722ac27a0ecSDave Kleikamp 723ac27a0ecSDave Kleikamp cleanup: 724ac27a0ecSDave Kleikamp return error; 725ac27a0ecSDave Kleikamp } 726ac27a0ecSDave Kleikamp 727ac27a0ecSDave Kleikamp static int 728617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 729617ba13bSMingming Cao struct ext4_xattr_info *i, 730617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 731ac27a0ecSDave Kleikamp { 732ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 733ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 734617ba13bSMingming Cao struct ext4_xattr_search *s = &bs->s; 735ac27a0ecSDave Kleikamp struct mb_cache_entry *ce = NULL; 7368a2bfdcbSMingming Cao int error = 0; 737ac27a0ecSDave Kleikamp 738617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 739ac27a0ecSDave Kleikamp 740ac27a0ecSDave Kleikamp if (i->value && i->value_len > sb->s_blocksize) 741ac27a0ecSDave Kleikamp return -ENOSPC; 742ac27a0ecSDave Kleikamp if (s->base) { 743617ba13bSMingming Cao ce = mb_cache_entry_get(ext4_xattr_cache, bs->bh->b_bdev, 744ac27a0ecSDave Kleikamp bs->bh->b_blocknr); 7458a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 7468a2bfdcbSMingming Cao if (error) 7478a2bfdcbSMingming Cao goto cleanup; 7488a2bfdcbSMingming Cao lock_buffer(bs->bh); 7498a2bfdcbSMingming Cao 750ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 751ac27a0ecSDave Kleikamp if (ce) { 752ac27a0ecSDave Kleikamp mb_cache_entry_free(ce); 753ac27a0ecSDave Kleikamp ce = NULL; 754ac27a0ecSDave Kleikamp } 755ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 756617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 757ac27a0ecSDave Kleikamp if (!error) { 758ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 759617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), 760ac27a0ecSDave Kleikamp s->here); 761617ba13bSMingming Cao ext4_xattr_cache_insert(bs->bh); 762ac27a0ecSDave Kleikamp } 763ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 764ac27a0ecSDave Kleikamp if (error == -EIO) 765ac27a0ecSDave Kleikamp goto bad_block; 766ac27a0ecSDave Kleikamp if (!error) 767cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 7680390131bSFrank Mayhar inode, 769ac27a0ecSDave Kleikamp bs->bh); 770ac27a0ecSDave Kleikamp if (error) 771ac27a0ecSDave Kleikamp goto cleanup; 772ac27a0ecSDave Kleikamp goto inserted; 773ac27a0ecSDave Kleikamp } else { 774ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 775ac27a0ecSDave Kleikamp 7768a2bfdcbSMingming Cao unlock_buffer(bs->bh); 777ac27a0ecSDave Kleikamp if (ce) { 778ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 779ac27a0ecSDave Kleikamp ce = NULL; 780ac27a0ecSDave Kleikamp } 781ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 782216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 783ac27a0ecSDave Kleikamp error = -ENOMEM; 784ac27a0ecSDave Kleikamp if (s->base == NULL) 785ac27a0ecSDave Kleikamp goto cleanup; 786ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 787ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 788ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 789ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 790ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 791ac27a0ecSDave Kleikamp } 792ac27a0ecSDave Kleikamp } else { 793ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 794216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 795ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 796ac27a0ecSDave Kleikamp error = -ENOMEM; 797ac27a0ecSDave Kleikamp if (s->base == NULL) 798ac27a0ecSDave Kleikamp goto cleanup; 799617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 800ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 801ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 802ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 803ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 804ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 805ac27a0ecSDave Kleikamp } 806ac27a0ecSDave Kleikamp 807617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 808ac27a0ecSDave Kleikamp if (error == -EIO) 809ac27a0ecSDave Kleikamp goto bad_block; 810ac27a0ecSDave Kleikamp if (error) 811ac27a0ecSDave Kleikamp goto cleanup; 812ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 813617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), s->here); 814ac27a0ecSDave Kleikamp 815ac27a0ecSDave Kleikamp inserted: 816ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 817617ba13bSMingming Cao new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); 818ac27a0ecSDave Kleikamp if (new_bh) { 819ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 820ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 821ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 822ac27a0ecSDave Kleikamp else { 823ac27a0ecSDave Kleikamp /* The old block is released after updating 824ac27a0ecSDave Kleikamp the inode. */ 8255dd4056dSChristoph Hellwig error = dquot_alloc_block(inode, 1); 8265dd4056dSChristoph Hellwig if (error) 827ac27a0ecSDave Kleikamp goto cleanup; 828617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 829ac27a0ecSDave Kleikamp new_bh); 830ac27a0ecSDave Kleikamp if (error) 831ac27a0ecSDave Kleikamp goto cleanup_dquot; 832ac27a0ecSDave Kleikamp lock_buffer(new_bh); 833e8546d06SMarcin Slusarz le32_add_cpu(&BHDR(new_bh)->h_refcount, 1); 834ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 835ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(new_bh)->h_refcount)); 836ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 837cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 8380390131bSFrank Mayhar inode, 839ac27a0ecSDave Kleikamp new_bh); 840ac27a0ecSDave Kleikamp if (error) 841ac27a0ecSDave Kleikamp goto cleanup_dquot; 842ac27a0ecSDave Kleikamp } 843ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 844ac27a0ecSDave Kleikamp ce = NULL; 845ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 846ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 847ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 848ac27a0ecSDave Kleikamp new_bh = bs->bh; 849ac27a0ecSDave Kleikamp get_bh(new_bh); 850ac27a0ecSDave Kleikamp } else { 851ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 852fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 853fb0a387dSEric Sandeen 854fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 855d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 856fb0a387dSEric Sandeen 857fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 85812e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 859fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 860fb0a387dSEric Sandeen 8616d6a4351SEric Sandeen /* 8626d6a4351SEric Sandeen * take i_data_sem because we will test 8636d6a4351SEric Sandeen * i_delalloc_reserved_flag in ext4_mb_new_blocks 8646d6a4351SEric Sandeen */ 8656d6a4351SEric Sandeen down_read((&EXT4_I(inode)->i_data_sem)); 86655f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 86755f020dbSAllison Henderson NULL, &error); 8686d6a4351SEric Sandeen up_read((&EXT4_I(inode)->i_data_sem)); 869ac27a0ecSDave Kleikamp if (error) 870ac27a0ecSDave Kleikamp goto cleanup; 871fb0a387dSEric Sandeen 87212e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 873fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 874fb0a387dSEric Sandeen 875ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 876ace36ad4SJoe Perches (unsigned long long)block); 877ac27a0ecSDave Kleikamp 878ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 879ac27a0ecSDave Kleikamp if (!new_bh) { 880ac27a0ecSDave Kleikamp getblk_failed: 8817dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 882e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 883ac27a0ecSDave Kleikamp error = -EIO; 884ac27a0ecSDave Kleikamp goto cleanup; 885ac27a0ecSDave Kleikamp } 886ac27a0ecSDave Kleikamp lock_buffer(new_bh); 887617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 888ac27a0ecSDave Kleikamp if (error) { 889ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 890ac27a0ecSDave Kleikamp goto getblk_failed; 891ac27a0ecSDave Kleikamp } 892ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 893ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 894ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 895617ba13bSMingming Cao ext4_xattr_cache_insert(new_bh); 896cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 8970390131bSFrank Mayhar inode, new_bh); 898ac27a0ecSDave Kleikamp if (error) 899ac27a0ecSDave Kleikamp goto cleanup; 900ac27a0ecSDave Kleikamp } 901ac27a0ecSDave Kleikamp } 902ac27a0ecSDave Kleikamp 903ac27a0ecSDave Kleikamp /* Update the inode. */ 904617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 905ac27a0ecSDave Kleikamp 906ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 907ac27a0ecSDave Kleikamp if (bs->bh && bs->bh != new_bh) 908617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bs->bh); 909ac27a0ecSDave Kleikamp error = 0; 910ac27a0ecSDave Kleikamp 911ac27a0ecSDave Kleikamp cleanup: 912ac27a0ecSDave Kleikamp if (ce) 913ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 914ac27a0ecSDave Kleikamp brelse(new_bh); 915ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 916ac27a0ecSDave Kleikamp kfree(s->base); 917ac27a0ecSDave Kleikamp 918ac27a0ecSDave Kleikamp return error; 919ac27a0ecSDave Kleikamp 920ac27a0ecSDave Kleikamp cleanup_dquot: 9215dd4056dSChristoph Hellwig dquot_free_block(inode, 1); 922ac27a0ecSDave Kleikamp goto cleanup; 923ac27a0ecSDave Kleikamp 924ac27a0ecSDave Kleikamp bad_block: 92524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 92624676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 927ac27a0ecSDave Kleikamp goto cleanup; 928ac27a0ecSDave Kleikamp 929ac27a0ecSDave Kleikamp #undef header 930ac27a0ecSDave Kleikamp } 931ac27a0ecSDave Kleikamp 932*879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 933617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 934ac27a0ecSDave Kleikamp { 935617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 936617ba13bSMingming Cao struct ext4_inode *raw_inode; 937ac27a0ecSDave Kleikamp int error; 938ac27a0ecSDave Kleikamp 939617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 940ac27a0ecSDave Kleikamp return 0; 941617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 942ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 943ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 944ac27a0ecSDave Kleikamp is->s.here = is->s.first; 945617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 94619f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 947617ba13bSMingming Cao error = ext4_xattr_check_names(IFIRST(header), is->s.end); 948ac27a0ecSDave Kleikamp if (error) 949ac27a0ecSDave Kleikamp return error; 950ac27a0ecSDave Kleikamp /* Find the named attribute. */ 951617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 952ac27a0ecSDave Kleikamp i->name, is->s.end - 953ac27a0ecSDave Kleikamp (void *)is->s.base, 0); 954ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 955ac27a0ecSDave Kleikamp return error; 956ac27a0ecSDave Kleikamp is->s.not_found = error; 957ac27a0ecSDave Kleikamp } 958ac27a0ecSDave Kleikamp return 0; 959ac27a0ecSDave Kleikamp } 960ac27a0ecSDave Kleikamp 961*879b3825STao Ma int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 962617ba13bSMingming Cao struct ext4_xattr_info *i, 963617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 964ac27a0ecSDave Kleikamp { 965617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 966617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 967ac27a0ecSDave Kleikamp int error; 968ac27a0ecSDave Kleikamp 969617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 970ac27a0ecSDave Kleikamp return -ENOSPC; 971617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 972ac27a0ecSDave Kleikamp if (error) 973ac27a0ecSDave Kleikamp return error; 974617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 975ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 976617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 97719f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 978ac27a0ecSDave Kleikamp } else { 979ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 98019f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 981ac27a0ecSDave Kleikamp } 982ac27a0ecSDave Kleikamp return 0; 983ac27a0ecSDave Kleikamp } 984ac27a0ecSDave Kleikamp 985ac27a0ecSDave Kleikamp /* 986617ba13bSMingming Cao * ext4_xattr_set_handle() 987ac27a0ecSDave Kleikamp * 9886e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 989ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 990ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 991ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 992ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 993ac27a0ecSDave Kleikamp * previous to the call, respectively. 994ac27a0ecSDave Kleikamp * 995ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 996ac27a0ecSDave Kleikamp */ 997ac27a0ecSDave Kleikamp int 998617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 999ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 1000ac27a0ecSDave Kleikamp int flags) 1001ac27a0ecSDave Kleikamp { 1002617ba13bSMingming Cao struct ext4_xattr_info i = { 1003ac27a0ecSDave Kleikamp .name_index = name_index, 1004ac27a0ecSDave Kleikamp .name = name, 1005ac27a0ecSDave Kleikamp .value = value, 1006ac27a0ecSDave Kleikamp .value_len = value_len, 1007ac27a0ecSDave Kleikamp 1008ac27a0ecSDave Kleikamp }; 1009617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 1010ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1011ac27a0ecSDave Kleikamp }; 1012617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 1013ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1014ac27a0ecSDave Kleikamp }; 10154d20c685SKalpak Shah unsigned long no_expand; 1016ac27a0ecSDave Kleikamp int error; 1017ac27a0ecSDave Kleikamp 1018ac27a0ecSDave Kleikamp if (!name) 1019ac27a0ecSDave Kleikamp return -EINVAL; 1020ac27a0ecSDave Kleikamp if (strlen(name) > 255) 1021ac27a0ecSDave Kleikamp return -ERANGE; 1022617ba13bSMingming Cao down_write(&EXT4_I(inode)->xattr_sem); 102319f5fb7aSTheodore Ts'o no_expand = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND); 102419f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND); 10254d20c685SKalpak Shah 102666543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 102786ebfd08SEric Sandeen if (error) 102886ebfd08SEric Sandeen goto cleanup; 102986ebfd08SEric Sandeen 103019f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 1031617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 1032617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 103319f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 1034ac27a0ecSDave Kleikamp } 1035ac27a0ecSDave Kleikamp 1036617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 1037ac27a0ecSDave Kleikamp if (error) 1038ac27a0ecSDave Kleikamp goto cleanup; 1039ac27a0ecSDave Kleikamp if (is.s.not_found) 1040617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 1041ac27a0ecSDave Kleikamp if (error) 1042ac27a0ecSDave Kleikamp goto cleanup; 1043ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 1044ac27a0ecSDave Kleikamp error = -ENODATA; 1045ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 1046ac27a0ecSDave Kleikamp goto cleanup; 1047ac27a0ecSDave Kleikamp error = 0; 1048ac27a0ecSDave Kleikamp if (!value) 1049ac27a0ecSDave Kleikamp goto cleanup; 1050ac27a0ecSDave Kleikamp } else { 1051ac27a0ecSDave Kleikamp error = -EEXIST; 1052ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 1053ac27a0ecSDave Kleikamp goto cleanup; 1054ac27a0ecSDave Kleikamp } 1055ac27a0ecSDave Kleikamp if (!value) { 1056ac27a0ecSDave Kleikamp if (!is.s.not_found) 1057617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1058ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 1059617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1060ac27a0ecSDave Kleikamp } else { 1061617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1062ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 1063ac27a0ecSDave Kleikamp i.value = NULL; 1064617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1065ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 10667e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 10677e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 10687e01c8e5STiger Yang if (error) 10697e01c8e5STiger Yang goto cleanup; 10707e01c8e5STiger Yang } 1071617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1072ac27a0ecSDave Kleikamp if (error) 1073ac27a0ecSDave Kleikamp goto cleanup; 1074ac27a0ecSDave Kleikamp if (!is.s.not_found) { 1075ac27a0ecSDave Kleikamp i.value = NULL; 1076617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, 1077ac27a0ecSDave Kleikamp &is); 1078ac27a0ecSDave Kleikamp } 1079ac27a0ecSDave Kleikamp } 1080ac27a0ecSDave Kleikamp } 1081ac27a0ecSDave Kleikamp if (!error) { 1082617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 1083ef7f3835SKalpak Shah inode->i_ctime = ext4_current_time(inode); 10846dd4ee7cSKalpak Shah if (!value) 108519f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); 1086617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 1087ac27a0ecSDave Kleikamp /* 1088617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 1089ac27a0ecSDave Kleikamp * error != 0. 1090ac27a0ecSDave Kleikamp */ 1091ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 1092ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 10930390131bSFrank Mayhar ext4_handle_sync(handle); 1094ac27a0ecSDave Kleikamp } 1095ac27a0ecSDave Kleikamp 1096ac27a0ecSDave Kleikamp cleanup: 1097ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 1098ac27a0ecSDave Kleikamp brelse(bs.bh); 10994d20c685SKalpak Shah if (no_expand == 0) 110019f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); 1101617ba13bSMingming Cao up_write(&EXT4_I(inode)->xattr_sem); 1102ac27a0ecSDave Kleikamp return error; 1103ac27a0ecSDave Kleikamp } 1104ac27a0ecSDave Kleikamp 1105ac27a0ecSDave Kleikamp /* 1106617ba13bSMingming Cao * ext4_xattr_set() 1107ac27a0ecSDave Kleikamp * 1108617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 1109ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 1110ac27a0ecSDave Kleikamp * 1111ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1112ac27a0ecSDave Kleikamp */ 1113ac27a0ecSDave Kleikamp int 1114617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 1115ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 1116ac27a0ecSDave Kleikamp { 1117ac27a0ecSDave Kleikamp handle_t *handle; 1118ac27a0ecSDave Kleikamp int error, retries = 0; 1119ac27a0ecSDave Kleikamp 1120ac27a0ecSDave Kleikamp retry: 1121617ba13bSMingming Cao handle = ext4_journal_start(inode, EXT4_DATA_TRANS_BLOCKS(inode->i_sb)); 1122ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 1123ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 1124ac27a0ecSDave Kleikamp } else { 1125ac27a0ecSDave Kleikamp int error2; 1126ac27a0ecSDave Kleikamp 1127617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 1128ac27a0ecSDave Kleikamp value, value_len, flags); 1129617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 1130ac27a0ecSDave Kleikamp if (error == -ENOSPC && 1131617ba13bSMingming Cao ext4_should_retry_alloc(inode->i_sb, &retries)) 1132ac27a0ecSDave Kleikamp goto retry; 1133ac27a0ecSDave Kleikamp if (error == 0) 1134ac27a0ecSDave Kleikamp error = error2; 1135ac27a0ecSDave Kleikamp } 1136ac27a0ecSDave Kleikamp 1137ac27a0ecSDave Kleikamp return error; 1138ac27a0ecSDave Kleikamp } 1139ac27a0ecSDave Kleikamp 1140ac27a0ecSDave Kleikamp /* 11416dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 11426dd4ee7cSKalpak Shah * i_extra_isize. 11436dd4ee7cSKalpak Shah */ 11446dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 11456dd4ee7cSKalpak Shah int value_offs_shift, void *to, 11466dd4ee7cSKalpak Shah void *from, size_t n, int blocksize) 11476dd4ee7cSKalpak Shah { 11486dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 11496dd4ee7cSKalpak Shah int new_offs; 11506dd4ee7cSKalpak Shah 11516dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 11526dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 11536dd4ee7cSKalpak Shah if (!last->e_value_block && last->e_value_size) { 11546dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 11556dd4ee7cSKalpak Shah value_offs_shift; 11566dd4ee7cSKalpak Shah BUG_ON(new_offs + le32_to_cpu(last->e_value_size) 11576dd4ee7cSKalpak Shah > blocksize); 11586dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 11596dd4ee7cSKalpak Shah } 11606dd4ee7cSKalpak Shah } 11616dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 11626dd4ee7cSKalpak Shah memmove(to, from, n); 11636dd4ee7cSKalpak Shah } 11646dd4ee7cSKalpak Shah 11656dd4ee7cSKalpak Shah /* 11666dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 11676dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 11686dd4ee7cSKalpak Shah */ 11696dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 11706dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 11716dd4ee7cSKalpak Shah { 11726dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 11736dd4ee7cSKalpak Shah struct ext4_xattr_entry *entry, *last, *first; 11746dd4ee7cSKalpak Shah struct buffer_head *bh = NULL; 11756dd4ee7cSKalpak Shah struct ext4_xattr_ibody_find *is = NULL; 11766dd4ee7cSKalpak Shah struct ext4_xattr_block_find *bs = NULL; 11776dd4ee7cSKalpak Shah char *buffer = NULL, *b_entry_name = NULL; 11786dd4ee7cSKalpak Shah size_t min_offs, free; 11796dd4ee7cSKalpak Shah int total_ino, total_blk; 11806dd4ee7cSKalpak Shah void *base, *start, *end; 11816dd4ee7cSKalpak Shah int extra_isize = 0, error = 0, tried_min_extra_isize = 0; 1182ac39849dSAneesh Kumar K.V int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); 11836dd4ee7cSKalpak Shah 11846dd4ee7cSKalpak Shah down_write(&EXT4_I(inode)->xattr_sem); 11856dd4ee7cSKalpak Shah retry: 11866dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) { 11876dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 11886dd4ee7cSKalpak Shah return 0; 11896dd4ee7cSKalpak Shah } 11906dd4ee7cSKalpak Shah 11916dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 11926dd4ee7cSKalpak Shah entry = IFIRST(header); 11936dd4ee7cSKalpak Shah 11946dd4ee7cSKalpak Shah /* 11956dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 11966dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 11976dd4ee7cSKalpak Shah */ 11986dd4ee7cSKalpak Shah 11996dd4ee7cSKalpak Shah base = start = entry; 12006dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 12016dd4ee7cSKalpak Shah min_offs = end - base; 12026dd4ee7cSKalpak Shah last = entry; 12036dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 12046dd4ee7cSKalpak Shah 12056dd4ee7cSKalpak Shah free = ext4_xattr_free_space(last, &min_offs, base, &total_ino); 12066dd4ee7cSKalpak Shah if (free >= new_extra_isize) { 12076dd4ee7cSKalpak Shah entry = IFIRST(header); 12086dd4ee7cSKalpak Shah ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize 12096dd4ee7cSKalpak Shah - new_extra_isize, (void *)raw_inode + 12106dd4ee7cSKalpak Shah EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 12116dd4ee7cSKalpak Shah (void *)header, total_ino, 12126dd4ee7cSKalpak Shah inode->i_sb->s_blocksize); 12136dd4ee7cSKalpak Shah EXT4_I(inode)->i_extra_isize = new_extra_isize; 12146dd4ee7cSKalpak Shah error = 0; 12156dd4ee7cSKalpak Shah goto cleanup; 12166dd4ee7cSKalpak Shah } 12176dd4ee7cSKalpak Shah 12186dd4ee7cSKalpak Shah /* 12196dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 12206dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 12216dd4ee7cSKalpak Shah */ 12226dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 12236dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 12246dd4ee7cSKalpak Shah error = -EIO; 12256dd4ee7cSKalpak Shah if (!bh) 12266dd4ee7cSKalpak Shah goto cleanup; 1227cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 122824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 122924676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 12306dd4ee7cSKalpak Shah error = -EIO; 12316dd4ee7cSKalpak Shah goto cleanup; 12326dd4ee7cSKalpak Shah } 12336dd4ee7cSKalpak Shah base = BHDR(bh); 12346dd4ee7cSKalpak Shah first = BFIRST(bh); 12356dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 12366dd4ee7cSKalpak Shah min_offs = end - base; 12376dd4ee7cSKalpak Shah free = ext4_xattr_free_space(first, &min_offs, base, 12386dd4ee7cSKalpak Shah &total_blk); 12396dd4ee7cSKalpak Shah if (free < new_extra_isize) { 12406dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 12416dd4ee7cSKalpak Shah tried_min_extra_isize++; 12426dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 12436dd4ee7cSKalpak Shah brelse(bh); 12446dd4ee7cSKalpak Shah goto retry; 12456dd4ee7cSKalpak Shah } 12466dd4ee7cSKalpak Shah error = -1; 12476dd4ee7cSKalpak Shah goto cleanup; 12486dd4ee7cSKalpak Shah } 12496dd4ee7cSKalpak Shah } else { 12506dd4ee7cSKalpak Shah free = inode->i_sb->s_blocksize; 12516dd4ee7cSKalpak Shah } 12526dd4ee7cSKalpak Shah 12536dd4ee7cSKalpak Shah while (new_extra_isize > 0) { 12546dd4ee7cSKalpak Shah size_t offs, size, entry_size; 12556dd4ee7cSKalpak Shah struct ext4_xattr_entry *small_entry = NULL; 12566dd4ee7cSKalpak Shah struct ext4_xattr_info i = { 12576dd4ee7cSKalpak Shah .value = NULL, 12586dd4ee7cSKalpak Shah .value_len = 0, 12596dd4ee7cSKalpak Shah }; 12606dd4ee7cSKalpak Shah unsigned int total_size; /* EA entry size + value size */ 12616dd4ee7cSKalpak Shah unsigned int shift_bytes; /* No. of bytes to shift EAs by? */ 12626dd4ee7cSKalpak Shah unsigned int min_total_size = ~0U; 12636dd4ee7cSKalpak Shah 12646dd4ee7cSKalpak Shah is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 12656dd4ee7cSKalpak Shah bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 12666dd4ee7cSKalpak Shah if (!is || !bs) { 12676dd4ee7cSKalpak Shah error = -ENOMEM; 12686dd4ee7cSKalpak Shah goto cleanup; 12696dd4ee7cSKalpak Shah } 12706dd4ee7cSKalpak Shah 12716dd4ee7cSKalpak Shah is->s.not_found = -ENODATA; 12726dd4ee7cSKalpak Shah bs->s.not_found = -ENODATA; 12736dd4ee7cSKalpak Shah is->iloc.bh = NULL; 12746dd4ee7cSKalpak Shah bs->bh = NULL; 12756dd4ee7cSKalpak Shah 12766dd4ee7cSKalpak Shah last = IFIRST(header); 12776dd4ee7cSKalpak Shah /* Find the entry best suited to be pushed into EA block */ 12786dd4ee7cSKalpak Shah entry = NULL; 12796dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 12806dd4ee7cSKalpak Shah total_size = 12816dd4ee7cSKalpak Shah EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + 12826dd4ee7cSKalpak Shah EXT4_XATTR_LEN(last->e_name_len); 12836dd4ee7cSKalpak Shah if (total_size <= free && total_size < min_total_size) { 12846dd4ee7cSKalpak Shah if (total_size < new_extra_isize) { 12856dd4ee7cSKalpak Shah small_entry = last; 12866dd4ee7cSKalpak Shah } else { 12876dd4ee7cSKalpak Shah entry = last; 12886dd4ee7cSKalpak Shah min_total_size = total_size; 12896dd4ee7cSKalpak Shah } 12906dd4ee7cSKalpak Shah } 12916dd4ee7cSKalpak Shah } 12926dd4ee7cSKalpak Shah 12936dd4ee7cSKalpak Shah if (entry == NULL) { 12946dd4ee7cSKalpak Shah if (small_entry) { 12956dd4ee7cSKalpak Shah entry = small_entry; 12966dd4ee7cSKalpak Shah } else { 12976dd4ee7cSKalpak Shah if (!tried_min_extra_isize && 12986dd4ee7cSKalpak Shah s_min_extra_isize) { 12996dd4ee7cSKalpak Shah tried_min_extra_isize++; 13006dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 13016dd4ee7cSKalpak Shah goto retry; 13026dd4ee7cSKalpak Shah } 13036dd4ee7cSKalpak Shah error = -1; 13046dd4ee7cSKalpak Shah goto cleanup; 13056dd4ee7cSKalpak Shah } 13066dd4ee7cSKalpak Shah } 13076dd4ee7cSKalpak Shah offs = le16_to_cpu(entry->e_value_offs); 13086dd4ee7cSKalpak Shah size = le32_to_cpu(entry->e_value_size); 13096dd4ee7cSKalpak Shah entry_size = EXT4_XATTR_LEN(entry->e_name_len); 13106dd4ee7cSKalpak Shah i.name_index = entry->e_name_index, 13116dd4ee7cSKalpak Shah buffer = kmalloc(EXT4_XATTR_SIZE(size), GFP_NOFS); 13126dd4ee7cSKalpak Shah b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 13136dd4ee7cSKalpak Shah if (!buffer || !b_entry_name) { 13146dd4ee7cSKalpak Shah error = -ENOMEM; 13156dd4ee7cSKalpak Shah goto cleanup; 13166dd4ee7cSKalpak Shah } 13176dd4ee7cSKalpak Shah /* Save the entry name and the entry value */ 13186dd4ee7cSKalpak Shah memcpy(buffer, (void *)IFIRST(header) + offs, 13196dd4ee7cSKalpak Shah EXT4_XATTR_SIZE(size)); 13206dd4ee7cSKalpak Shah memcpy(b_entry_name, entry->e_name, entry->e_name_len); 13216dd4ee7cSKalpak Shah b_entry_name[entry->e_name_len] = '\0'; 13226dd4ee7cSKalpak Shah i.name = b_entry_name; 13236dd4ee7cSKalpak Shah 13246dd4ee7cSKalpak Shah error = ext4_get_inode_loc(inode, &is->iloc); 13256dd4ee7cSKalpak Shah if (error) 13266dd4ee7cSKalpak Shah goto cleanup; 13276dd4ee7cSKalpak Shah 13286dd4ee7cSKalpak Shah error = ext4_xattr_ibody_find(inode, &i, is); 13296dd4ee7cSKalpak Shah if (error) 13306dd4ee7cSKalpak Shah goto cleanup; 13316dd4ee7cSKalpak Shah 13326dd4ee7cSKalpak Shah /* Remove the chosen entry from the inode */ 13336dd4ee7cSKalpak Shah error = ext4_xattr_ibody_set(handle, inode, &i, is); 13349aaab058SRoel Kluin if (error) 13359aaab058SRoel Kluin goto cleanup; 13366dd4ee7cSKalpak Shah 13376dd4ee7cSKalpak Shah entry = IFIRST(header); 13386dd4ee7cSKalpak Shah if (entry_size + EXT4_XATTR_SIZE(size) >= new_extra_isize) 13396dd4ee7cSKalpak Shah shift_bytes = new_extra_isize; 13406dd4ee7cSKalpak Shah else 13416dd4ee7cSKalpak Shah shift_bytes = entry_size + size; 13426dd4ee7cSKalpak Shah /* Adjust the offsets and shift the remaining entries ahead */ 13436dd4ee7cSKalpak Shah ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize - 13446dd4ee7cSKalpak Shah shift_bytes, (void *)raw_inode + 13456dd4ee7cSKalpak Shah EXT4_GOOD_OLD_INODE_SIZE + extra_isize + shift_bytes, 13466dd4ee7cSKalpak Shah (void *)header, total_ino - entry_size, 13476dd4ee7cSKalpak Shah inode->i_sb->s_blocksize); 13486dd4ee7cSKalpak Shah 13496dd4ee7cSKalpak Shah extra_isize += shift_bytes; 13506dd4ee7cSKalpak Shah new_extra_isize -= shift_bytes; 13516dd4ee7cSKalpak Shah EXT4_I(inode)->i_extra_isize = extra_isize; 13526dd4ee7cSKalpak Shah 13536dd4ee7cSKalpak Shah i.name = b_entry_name; 13546dd4ee7cSKalpak Shah i.value = buffer; 1355ac39849dSAneesh Kumar K.V i.value_len = size; 13566dd4ee7cSKalpak Shah error = ext4_xattr_block_find(inode, &i, bs); 13576dd4ee7cSKalpak Shah if (error) 13586dd4ee7cSKalpak Shah goto cleanup; 13596dd4ee7cSKalpak Shah 13606dd4ee7cSKalpak Shah /* Add entry which was removed from the inode into the block */ 13616dd4ee7cSKalpak Shah error = ext4_xattr_block_set(handle, inode, &i, bs); 13626dd4ee7cSKalpak Shah if (error) 13636dd4ee7cSKalpak Shah goto cleanup; 13646dd4ee7cSKalpak Shah kfree(b_entry_name); 13656dd4ee7cSKalpak Shah kfree(buffer); 1366d3533d72SJulia Lawall b_entry_name = NULL; 1367d3533d72SJulia Lawall buffer = NULL; 13686dd4ee7cSKalpak Shah brelse(is->iloc.bh); 13696dd4ee7cSKalpak Shah kfree(is); 13706dd4ee7cSKalpak Shah kfree(bs); 13716dd4ee7cSKalpak Shah } 13726dd4ee7cSKalpak Shah brelse(bh); 13736dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 13746dd4ee7cSKalpak Shah return 0; 13756dd4ee7cSKalpak Shah 13766dd4ee7cSKalpak Shah cleanup: 13776dd4ee7cSKalpak Shah kfree(b_entry_name); 13786dd4ee7cSKalpak Shah kfree(buffer); 13796dd4ee7cSKalpak Shah if (is) 13806dd4ee7cSKalpak Shah brelse(is->iloc.bh); 13816dd4ee7cSKalpak Shah kfree(is); 13826dd4ee7cSKalpak Shah kfree(bs); 13836dd4ee7cSKalpak Shah brelse(bh); 13846dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 13856dd4ee7cSKalpak Shah return error; 13866dd4ee7cSKalpak Shah } 13876dd4ee7cSKalpak Shah 13886dd4ee7cSKalpak Shah 13896dd4ee7cSKalpak Shah 13906dd4ee7cSKalpak Shah /* 1391617ba13bSMingming Cao * ext4_xattr_delete_inode() 1392ac27a0ecSDave Kleikamp * 1393ac27a0ecSDave Kleikamp * Free extended attribute resources associated with this inode. This 1394ac27a0ecSDave Kleikamp * is called immediately before an inode is freed. We have exclusive 1395ac27a0ecSDave Kleikamp * access to the inode. 1396ac27a0ecSDave Kleikamp */ 1397ac27a0ecSDave Kleikamp void 1398617ba13bSMingming Cao ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) 1399ac27a0ecSDave Kleikamp { 1400ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 1401ac27a0ecSDave Kleikamp 1402617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 1403ac27a0ecSDave Kleikamp goto cleanup; 1404617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 1405ac27a0ecSDave Kleikamp if (!bh) { 140624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 140724676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1408ac27a0ecSDave Kleikamp goto cleanup; 1409ac27a0ecSDave Kleikamp } 1410617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 1411ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) { 141224676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 141324676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1414ac27a0ecSDave Kleikamp goto cleanup; 1415ac27a0ecSDave Kleikamp } 1416617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bh); 1417617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 1418ac27a0ecSDave Kleikamp 1419ac27a0ecSDave Kleikamp cleanup: 1420ac27a0ecSDave Kleikamp brelse(bh); 1421ac27a0ecSDave Kleikamp } 1422ac27a0ecSDave Kleikamp 1423ac27a0ecSDave Kleikamp /* 1424617ba13bSMingming Cao * ext4_xattr_put_super() 1425ac27a0ecSDave Kleikamp * 1426ac27a0ecSDave Kleikamp * This is called when a file system is unmounted. 1427ac27a0ecSDave Kleikamp */ 1428ac27a0ecSDave Kleikamp void 1429617ba13bSMingming Cao ext4_xattr_put_super(struct super_block *sb) 1430ac27a0ecSDave Kleikamp { 1431ac27a0ecSDave Kleikamp mb_cache_shrink(sb->s_bdev); 1432ac27a0ecSDave Kleikamp } 1433ac27a0ecSDave Kleikamp 1434ac27a0ecSDave Kleikamp /* 1435617ba13bSMingming Cao * ext4_xattr_cache_insert() 1436ac27a0ecSDave Kleikamp * 1437ac27a0ecSDave Kleikamp * Create a new entry in the extended attribute cache, and insert 1438ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 1439ac27a0ecSDave Kleikamp * 1440ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1441ac27a0ecSDave Kleikamp */ 1442ac27a0ecSDave Kleikamp static void 1443617ba13bSMingming Cao ext4_xattr_cache_insert(struct buffer_head *bh) 1444ac27a0ecSDave Kleikamp { 1445ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(BHDR(bh)->h_hash); 1446ac27a0ecSDave Kleikamp struct mb_cache_entry *ce; 1447ac27a0ecSDave Kleikamp int error; 1448ac27a0ecSDave Kleikamp 1449335e92e8SJan Kara ce = mb_cache_entry_alloc(ext4_xattr_cache, GFP_NOFS); 1450ac27a0ecSDave Kleikamp if (!ce) { 1451ac27a0ecSDave Kleikamp ea_bdebug(bh, "out of memory"); 1452ac27a0ecSDave Kleikamp return; 1453ac27a0ecSDave Kleikamp } 14542aec7c52SAndreas Gruenbacher error = mb_cache_entry_insert(ce, bh->b_bdev, bh->b_blocknr, hash); 1455ac27a0ecSDave Kleikamp if (error) { 1456ac27a0ecSDave Kleikamp mb_cache_entry_free(ce); 1457ac27a0ecSDave Kleikamp if (error == -EBUSY) { 1458ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 1459ac27a0ecSDave Kleikamp error = 0; 1460ac27a0ecSDave Kleikamp } 1461ac27a0ecSDave Kleikamp } else { 1462ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 1463ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 1464ac27a0ecSDave Kleikamp } 1465ac27a0ecSDave Kleikamp } 1466ac27a0ecSDave Kleikamp 1467ac27a0ecSDave Kleikamp /* 1468617ba13bSMingming Cao * ext4_xattr_cmp() 1469ac27a0ecSDave Kleikamp * 1470ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 1471ac27a0ecSDave Kleikamp * 1472ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 1473ac27a0ecSDave Kleikamp * a negative error number on errors. 1474ac27a0ecSDave Kleikamp */ 1475ac27a0ecSDave Kleikamp static int 1476617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 1477617ba13bSMingming Cao struct ext4_xattr_header *header2) 1478ac27a0ecSDave Kleikamp { 1479617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 1480ac27a0ecSDave Kleikamp 1481ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 1482ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 1483ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 1484ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 1485ac27a0ecSDave Kleikamp return 1; 1486ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 1487ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 1488ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 1489ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 1490ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 1491ac27a0ecSDave Kleikamp return 1; 1492ac27a0ecSDave Kleikamp if (entry1->e_value_block != 0 || entry2->e_value_block != 0) 1493ac27a0ecSDave Kleikamp return -EIO; 1494ac27a0ecSDave Kleikamp if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 1495ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 1496ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 1497ac27a0ecSDave Kleikamp return 1; 1498ac27a0ecSDave Kleikamp 1499617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 1500617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 1501ac27a0ecSDave Kleikamp } 1502ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 1503ac27a0ecSDave Kleikamp return 1; 1504ac27a0ecSDave Kleikamp return 0; 1505ac27a0ecSDave Kleikamp } 1506ac27a0ecSDave Kleikamp 1507ac27a0ecSDave Kleikamp /* 1508617ba13bSMingming Cao * ext4_xattr_cache_find() 1509ac27a0ecSDave Kleikamp * 1510ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 1511ac27a0ecSDave Kleikamp * 1512ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 1513ac27a0ecSDave Kleikamp * not found or an error occurred. 1514ac27a0ecSDave Kleikamp */ 1515ac27a0ecSDave Kleikamp static struct buffer_head * 1516617ba13bSMingming Cao ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, 1517ac27a0ecSDave Kleikamp struct mb_cache_entry **pce) 1518ac27a0ecSDave Kleikamp { 1519ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 1520ac27a0ecSDave Kleikamp struct mb_cache_entry *ce; 1521ac27a0ecSDave Kleikamp 1522ac27a0ecSDave Kleikamp if (!header->h_hash) 1523ac27a0ecSDave Kleikamp return NULL; /* never share */ 1524ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 1525ac27a0ecSDave Kleikamp again: 15262aec7c52SAndreas Gruenbacher ce = mb_cache_entry_find_first(ext4_xattr_cache, inode->i_sb->s_bdev, 15272aec7c52SAndreas Gruenbacher hash); 1528ac27a0ecSDave Kleikamp while (ce) { 1529ac27a0ecSDave Kleikamp struct buffer_head *bh; 1530ac27a0ecSDave Kleikamp 1531ac27a0ecSDave Kleikamp if (IS_ERR(ce)) { 1532ac27a0ecSDave Kleikamp if (PTR_ERR(ce) == -EAGAIN) 1533ac27a0ecSDave Kleikamp goto again; 1534ac27a0ecSDave Kleikamp break; 1535ac27a0ecSDave Kleikamp } 1536ac27a0ecSDave Kleikamp bh = sb_bread(inode->i_sb, ce->e_block); 1537ac27a0ecSDave Kleikamp if (!bh) { 153824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 153924676da4STheodore Ts'o (unsigned long) ce->e_block); 1540ac27a0ecSDave Kleikamp } else if (le32_to_cpu(BHDR(bh)->h_refcount) >= 1541617ba13bSMingming Cao EXT4_XATTR_REFCOUNT_MAX) { 1542ac27a0ecSDave Kleikamp ea_idebug(inode, "block %lu refcount %d>=%d", 1543ac27a0ecSDave Kleikamp (unsigned long) ce->e_block, 1544ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount), 1545617ba13bSMingming Cao EXT4_XATTR_REFCOUNT_MAX); 1546617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 1547ac27a0ecSDave Kleikamp *pce = ce; 1548ac27a0ecSDave Kleikamp return bh; 1549ac27a0ecSDave Kleikamp } 1550ac27a0ecSDave Kleikamp brelse(bh); 15512aec7c52SAndreas Gruenbacher ce = mb_cache_entry_find_next(ce, inode->i_sb->s_bdev, hash); 1552ac27a0ecSDave Kleikamp } 1553ac27a0ecSDave Kleikamp return NULL; 1554ac27a0ecSDave Kleikamp } 1555ac27a0ecSDave Kleikamp 1556ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 1557ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 1558ac27a0ecSDave Kleikamp 1559ac27a0ecSDave Kleikamp /* 1560617ba13bSMingming Cao * ext4_xattr_hash_entry() 1561ac27a0ecSDave Kleikamp * 1562ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 1563ac27a0ecSDave Kleikamp */ 1564617ba13bSMingming Cao static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, 1565617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1566ac27a0ecSDave Kleikamp { 1567ac27a0ecSDave Kleikamp __u32 hash = 0; 1568ac27a0ecSDave Kleikamp char *name = entry->e_name; 1569ac27a0ecSDave Kleikamp int n; 1570ac27a0ecSDave Kleikamp 1571ac27a0ecSDave Kleikamp for (n = 0; n < entry->e_name_len; n++) { 1572ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 1573ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 1574ac27a0ecSDave Kleikamp *name++; 1575ac27a0ecSDave Kleikamp } 1576ac27a0ecSDave Kleikamp 1577ac27a0ecSDave Kleikamp if (entry->e_value_block == 0 && entry->e_value_size != 0) { 1578ac27a0ecSDave Kleikamp __le32 *value = (__le32 *)((char *)header + 1579ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs)); 1580ac27a0ecSDave Kleikamp for (n = (le32_to_cpu(entry->e_value_size) + 1581617ba13bSMingming Cao EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { 1582ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 1583ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 1584ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 1585ac27a0ecSDave Kleikamp } 1586ac27a0ecSDave Kleikamp } 1587ac27a0ecSDave Kleikamp entry->e_hash = cpu_to_le32(hash); 1588ac27a0ecSDave Kleikamp } 1589ac27a0ecSDave Kleikamp 1590ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 1591ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 1592ac27a0ecSDave Kleikamp 1593ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 1594ac27a0ecSDave Kleikamp 1595ac27a0ecSDave Kleikamp /* 1596617ba13bSMingming Cao * ext4_xattr_rehash() 1597ac27a0ecSDave Kleikamp * 1598ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 1599ac27a0ecSDave Kleikamp */ 1600617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *header, 1601617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1602ac27a0ecSDave Kleikamp { 1603617ba13bSMingming Cao struct ext4_xattr_entry *here; 1604ac27a0ecSDave Kleikamp __u32 hash = 0; 1605ac27a0ecSDave Kleikamp 1606617ba13bSMingming Cao ext4_xattr_hash_entry(header, entry); 1607ac27a0ecSDave Kleikamp here = ENTRY(header+1); 1608ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 1609ac27a0ecSDave Kleikamp if (!here->e_hash) { 1610ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 1611ac27a0ecSDave Kleikamp hash = 0; 1612ac27a0ecSDave Kleikamp break; 1613ac27a0ecSDave Kleikamp } 1614ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 1615ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 1616ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 1617617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 1618ac27a0ecSDave Kleikamp } 1619ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 1620ac27a0ecSDave Kleikamp } 1621ac27a0ecSDave Kleikamp 1622ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 1623ac27a0ecSDave Kleikamp 1624ac27a0ecSDave Kleikamp int __init 16255dabfc78STheodore Ts'o ext4_init_xattr(void) 1626ac27a0ecSDave Kleikamp { 16272aec7c52SAndreas Gruenbacher ext4_xattr_cache = mb_cache_create("ext4_xattr", 6); 1628617ba13bSMingming Cao if (!ext4_xattr_cache) 1629ac27a0ecSDave Kleikamp return -ENOMEM; 1630ac27a0ecSDave Kleikamp return 0; 1631ac27a0ecSDave Kleikamp } 1632ac27a0ecSDave Kleikamp 1633ac27a0ecSDave Kleikamp void 16345dabfc78STheodore Ts'o ext4_exit_xattr(void) 1635ac27a0ecSDave Kleikamp { 1636617ba13bSMingming Cao if (ext4_xattr_cache) 1637617ba13bSMingming Cao mb_cache_destroy(ext4_xattr_cache); 1638617ba13bSMingming Cao ext4_xattr_cache = NULL; 1639ac27a0ecSDave Kleikamp } 1640