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 310879b3825STao 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); 631*bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 632*bd9926e8STheodore Ts'o memset(val, 0, size); 633*bd9926e8STheodore Ts'o } else { 634*bd9926e8STheodore Ts'o /* Clear pad bytes first. */ 635617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 636*bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 637ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 638*bd9926e8STheodore Ts'o } 639ac27a0ecSDave Kleikamp return 0; 640ac27a0ecSDave Kleikamp } 641ac27a0ecSDave Kleikamp 642ac27a0ecSDave Kleikamp /* Remove the old value. */ 643ac27a0ecSDave Kleikamp memmove(first_val + size, first_val, val - first_val); 644ac27a0ecSDave Kleikamp memset(first_val, 0, size); 645ac27a0ecSDave Kleikamp s->here->e_value_size = 0; 646ac27a0ecSDave Kleikamp s->here->e_value_offs = 0; 647ac27a0ecSDave Kleikamp min_offs += size; 648ac27a0ecSDave Kleikamp 649ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 650ac27a0ecSDave Kleikamp last = s->first; 651ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 652ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 653ac27a0ecSDave Kleikamp if (!last->e_value_block && 654ac27a0ecSDave Kleikamp last->e_value_size && o < offs) 655ac27a0ecSDave Kleikamp last->e_value_offs = 656ac27a0ecSDave Kleikamp cpu_to_le16(o + size); 657617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 658ac27a0ecSDave Kleikamp } 659ac27a0ecSDave Kleikamp } 660ac27a0ecSDave Kleikamp if (!i->value) { 661ac27a0ecSDave Kleikamp /* Remove the old name. */ 662617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 663ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 664ac27a0ecSDave Kleikamp memmove(s->here, (void *)s->here + size, 665ac27a0ecSDave Kleikamp (void *)last - (void *)s->here + sizeof(__u32)); 666ac27a0ecSDave Kleikamp memset(last, 0, size); 667ac27a0ecSDave Kleikamp } 668ac27a0ecSDave Kleikamp } 669ac27a0ecSDave Kleikamp 670ac27a0ecSDave Kleikamp if (i->value) { 671ac27a0ecSDave Kleikamp /* Insert the new value. */ 672ac27a0ecSDave Kleikamp s->here->e_value_size = cpu_to_le32(i->value_len); 673ac27a0ecSDave Kleikamp if (i->value_len) { 674617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE(i->value_len); 675ac27a0ecSDave Kleikamp void *val = s->base + min_offs - size; 676ac27a0ecSDave Kleikamp s->here->e_value_offs = cpu_to_le16(min_offs - size); 677*bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 678*bd9926e8STheodore Ts'o memset(val, 0, size); 679*bd9926e8STheodore Ts'o } else { 680*bd9926e8STheodore Ts'o /* Clear the pad bytes first. */ 681617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 682*bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 683ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 684ac27a0ecSDave Kleikamp } 685ac27a0ecSDave Kleikamp } 686*bd9926e8STheodore Ts'o } 687ac27a0ecSDave Kleikamp return 0; 688ac27a0ecSDave Kleikamp } 689ac27a0ecSDave Kleikamp 690617ba13bSMingming Cao struct ext4_xattr_block_find { 691617ba13bSMingming Cao struct ext4_xattr_search s; 692ac27a0ecSDave Kleikamp struct buffer_head *bh; 693ac27a0ecSDave Kleikamp }; 694ac27a0ecSDave Kleikamp 695ac27a0ecSDave Kleikamp static int 696617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 697617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 698ac27a0ecSDave Kleikamp { 699ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 700ac27a0ecSDave Kleikamp int error; 701ac27a0ecSDave Kleikamp 702ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 703ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 704ac27a0ecSDave Kleikamp 705617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 706ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 707617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 708ac27a0ecSDave Kleikamp error = -EIO; 709ac27a0ecSDave Kleikamp if (!bs->bh) 710ac27a0ecSDave Kleikamp goto cleanup; 711ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 712ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 713ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 714cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bs->bh)) { 71524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 71624676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 717ac27a0ecSDave Kleikamp error = -EIO; 718ac27a0ecSDave Kleikamp goto cleanup; 719ac27a0ecSDave Kleikamp } 720ac27a0ecSDave Kleikamp /* Find the named attribute. */ 721ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 722ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 723ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 724ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 725617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 726ac27a0ecSDave Kleikamp i->name, bs->bh->b_size, 1); 727ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 728ac27a0ecSDave Kleikamp goto cleanup; 729ac27a0ecSDave Kleikamp bs->s.not_found = error; 730ac27a0ecSDave Kleikamp } 731ac27a0ecSDave Kleikamp error = 0; 732ac27a0ecSDave Kleikamp 733ac27a0ecSDave Kleikamp cleanup: 734ac27a0ecSDave Kleikamp return error; 735ac27a0ecSDave Kleikamp } 736ac27a0ecSDave Kleikamp 737ac27a0ecSDave Kleikamp static int 738617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 739617ba13bSMingming Cao struct ext4_xattr_info *i, 740617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 741ac27a0ecSDave Kleikamp { 742ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 743ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 744617ba13bSMingming Cao struct ext4_xattr_search *s = &bs->s; 745ac27a0ecSDave Kleikamp struct mb_cache_entry *ce = NULL; 7468a2bfdcbSMingming Cao int error = 0; 747ac27a0ecSDave Kleikamp 748617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 749ac27a0ecSDave Kleikamp 750ac27a0ecSDave Kleikamp if (i->value && i->value_len > sb->s_blocksize) 751ac27a0ecSDave Kleikamp return -ENOSPC; 752ac27a0ecSDave Kleikamp if (s->base) { 753617ba13bSMingming Cao ce = mb_cache_entry_get(ext4_xattr_cache, bs->bh->b_bdev, 754ac27a0ecSDave Kleikamp bs->bh->b_blocknr); 7558a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 7568a2bfdcbSMingming Cao if (error) 7578a2bfdcbSMingming Cao goto cleanup; 7588a2bfdcbSMingming Cao lock_buffer(bs->bh); 7598a2bfdcbSMingming Cao 760ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 761ac27a0ecSDave Kleikamp if (ce) { 762ac27a0ecSDave Kleikamp mb_cache_entry_free(ce); 763ac27a0ecSDave Kleikamp ce = NULL; 764ac27a0ecSDave Kleikamp } 765ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 766617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 767ac27a0ecSDave Kleikamp if (!error) { 768ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 769617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), 770ac27a0ecSDave Kleikamp s->here); 771617ba13bSMingming Cao ext4_xattr_cache_insert(bs->bh); 772ac27a0ecSDave Kleikamp } 773ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 774ac27a0ecSDave Kleikamp if (error == -EIO) 775ac27a0ecSDave Kleikamp goto bad_block; 776ac27a0ecSDave Kleikamp if (!error) 777cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 7780390131bSFrank Mayhar inode, 779ac27a0ecSDave Kleikamp bs->bh); 780ac27a0ecSDave Kleikamp if (error) 781ac27a0ecSDave Kleikamp goto cleanup; 782ac27a0ecSDave Kleikamp goto inserted; 783ac27a0ecSDave Kleikamp } else { 784ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 785ac27a0ecSDave Kleikamp 7868a2bfdcbSMingming Cao unlock_buffer(bs->bh); 787ac27a0ecSDave Kleikamp if (ce) { 788ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 789ac27a0ecSDave Kleikamp ce = NULL; 790ac27a0ecSDave Kleikamp } 791ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 792216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 793ac27a0ecSDave Kleikamp error = -ENOMEM; 794ac27a0ecSDave Kleikamp if (s->base == NULL) 795ac27a0ecSDave Kleikamp goto cleanup; 796ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 797ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 798ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 799ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 800ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 801ac27a0ecSDave Kleikamp } 802ac27a0ecSDave Kleikamp } else { 803ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 804216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 805ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 806ac27a0ecSDave Kleikamp error = -ENOMEM; 807ac27a0ecSDave Kleikamp if (s->base == NULL) 808ac27a0ecSDave Kleikamp goto cleanup; 809617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 810ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 811ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 812ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 813ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 814ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 815ac27a0ecSDave Kleikamp } 816ac27a0ecSDave Kleikamp 817617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 818ac27a0ecSDave Kleikamp if (error == -EIO) 819ac27a0ecSDave Kleikamp goto bad_block; 820ac27a0ecSDave Kleikamp if (error) 821ac27a0ecSDave Kleikamp goto cleanup; 822ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 823617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), s->here); 824ac27a0ecSDave Kleikamp 825ac27a0ecSDave Kleikamp inserted: 826ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 827617ba13bSMingming Cao new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); 828ac27a0ecSDave Kleikamp if (new_bh) { 829ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 830ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 831ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 832ac27a0ecSDave Kleikamp else { 833ac27a0ecSDave Kleikamp /* The old block is released after updating 834ac27a0ecSDave Kleikamp the inode. */ 8355dd4056dSChristoph Hellwig error = dquot_alloc_block(inode, 1); 8365dd4056dSChristoph Hellwig if (error) 837ac27a0ecSDave Kleikamp goto cleanup; 838617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 839ac27a0ecSDave Kleikamp new_bh); 840ac27a0ecSDave Kleikamp if (error) 841ac27a0ecSDave Kleikamp goto cleanup_dquot; 842ac27a0ecSDave Kleikamp lock_buffer(new_bh); 843e8546d06SMarcin Slusarz le32_add_cpu(&BHDR(new_bh)->h_refcount, 1); 844ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 845ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(new_bh)->h_refcount)); 846ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 847cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 8480390131bSFrank Mayhar inode, 849ac27a0ecSDave Kleikamp new_bh); 850ac27a0ecSDave Kleikamp if (error) 851ac27a0ecSDave Kleikamp goto cleanup_dquot; 852ac27a0ecSDave Kleikamp } 853ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 854ac27a0ecSDave Kleikamp ce = NULL; 855ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 856ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 857ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 858ac27a0ecSDave Kleikamp new_bh = bs->bh; 859ac27a0ecSDave Kleikamp get_bh(new_bh); 860ac27a0ecSDave Kleikamp } else { 861ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 862fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 863fb0a387dSEric Sandeen 864fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 865d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 866fb0a387dSEric Sandeen 867fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 86812e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 869fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 870fb0a387dSEric Sandeen 8716d6a4351SEric Sandeen /* 8726d6a4351SEric Sandeen * take i_data_sem because we will test 8736d6a4351SEric Sandeen * i_delalloc_reserved_flag in ext4_mb_new_blocks 8746d6a4351SEric Sandeen */ 8756d6a4351SEric Sandeen down_read((&EXT4_I(inode)->i_data_sem)); 87655f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 87755f020dbSAllison Henderson NULL, &error); 8786d6a4351SEric Sandeen up_read((&EXT4_I(inode)->i_data_sem)); 879ac27a0ecSDave Kleikamp if (error) 880ac27a0ecSDave Kleikamp goto cleanup; 881fb0a387dSEric Sandeen 88212e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 883fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 884fb0a387dSEric Sandeen 885ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 886ace36ad4SJoe Perches (unsigned long long)block); 887ac27a0ecSDave Kleikamp 888ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 889ac27a0ecSDave Kleikamp if (!new_bh) { 890ac27a0ecSDave Kleikamp getblk_failed: 8917dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 892e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 893ac27a0ecSDave Kleikamp error = -EIO; 894ac27a0ecSDave Kleikamp goto cleanup; 895ac27a0ecSDave Kleikamp } 896ac27a0ecSDave Kleikamp lock_buffer(new_bh); 897617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 898ac27a0ecSDave Kleikamp if (error) { 899ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 900ac27a0ecSDave Kleikamp goto getblk_failed; 901ac27a0ecSDave Kleikamp } 902ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 903ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 904ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 905617ba13bSMingming Cao ext4_xattr_cache_insert(new_bh); 906cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 9070390131bSFrank Mayhar inode, new_bh); 908ac27a0ecSDave Kleikamp if (error) 909ac27a0ecSDave Kleikamp goto cleanup; 910ac27a0ecSDave Kleikamp } 911ac27a0ecSDave Kleikamp } 912ac27a0ecSDave Kleikamp 913ac27a0ecSDave Kleikamp /* Update the inode. */ 914617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 915ac27a0ecSDave Kleikamp 916ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 917ac27a0ecSDave Kleikamp if (bs->bh && bs->bh != new_bh) 918617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bs->bh); 919ac27a0ecSDave Kleikamp error = 0; 920ac27a0ecSDave Kleikamp 921ac27a0ecSDave Kleikamp cleanup: 922ac27a0ecSDave Kleikamp if (ce) 923ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 924ac27a0ecSDave Kleikamp brelse(new_bh); 925ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 926ac27a0ecSDave Kleikamp kfree(s->base); 927ac27a0ecSDave Kleikamp 928ac27a0ecSDave Kleikamp return error; 929ac27a0ecSDave Kleikamp 930ac27a0ecSDave Kleikamp cleanup_dquot: 9315dd4056dSChristoph Hellwig dquot_free_block(inode, 1); 932ac27a0ecSDave Kleikamp goto cleanup; 933ac27a0ecSDave Kleikamp 934ac27a0ecSDave Kleikamp bad_block: 93524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 93624676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 937ac27a0ecSDave Kleikamp goto cleanup; 938ac27a0ecSDave Kleikamp 939ac27a0ecSDave Kleikamp #undef header 940ac27a0ecSDave Kleikamp } 941ac27a0ecSDave Kleikamp 942879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 943617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 944ac27a0ecSDave Kleikamp { 945617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 946617ba13bSMingming Cao struct ext4_inode *raw_inode; 947ac27a0ecSDave Kleikamp int error; 948ac27a0ecSDave Kleikamp 949617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 950ac27a0ecSDave Kleikamp return 0; 951617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 952ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 953ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 954ac27a0ecSDave Kleikamp is->s.here = is->s.first; 955617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 95619f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 957617ba13bSMingming Cao error = ext4_xattr_check_names(IFIRST(header), is->s.end); 958ac27a0ecSDave Kleikamp if (error) 959ac27a0ecSDave Kleikamp return error; 960ac27a0ecSDave Kleikamp /* Find the named attribute. */ 961617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 962ac27a0ecSDave Kleikamp i->name, is->s.end - 963ac27a0ecSDave Kleikamp (void *)is->s.base, 0); 964ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 965ac27a0ecSDave Kleikamp return error; 966ac27a0ecSDave Kleikamp is->s.not_found = error; 967ac27a0ecSDave Kleikamp } 968ac27a0ecSDave Kleikamp return 0; 969ac27a0ecSDave Kleikamp } 970ac27a0ecSDave Kleikamp 9710d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 9720d812f77STao Ma struct ext4_xattr_info *i, 9730d812f77STao Ma struct ext4_xattr_ibody_find *is) 9740d812f77STao Ma { 9750d812f77STao Ma struct ext4_xattr_ibody_header *header; 9760d812f77STao Ma struct ext4_xattr_search *s = &is->s; 9770d812f77STao Ma int error; 9780d812f77STao Ma 9790d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 9800d812f77STao Ma return -ENOSPC; 9810d812f77STao Ma error = ext4_xattr_set_entry(i, s); 9820d812f77STao Ma if (error) { 9830d812f77STao Ma if (error == -ENOSPC && 9840d812f77STao Ma ext4_has_inline_data(inode)) { 9850d812f77STao Ma error = ext4_try_to_evict_inline_data(handle, inode, 9860d812f77STao Ma EXT4_XATTR_LEN(strlen(i->name) + 9870d812f77STao Ma EXT4_XATTR_SIZE(i->value_len))); 9880d812f77STao Ma if (error) 9890d812f77STao Ma return error; 9900d812f77STao Ma error = ext4_xattr_ibody_find(inode, i, is); 9910d812f77STao Ma if (error) 9920d812f77STao Ma return error; 9930d812f77STao Ma error = ext4_xattr_set_entry(i, s); 9940d812f77STao Ma } 9950d812f77STao Ma if (error) 9960d812f77STao Ma return error; 9970d812f77STao Ma } 9980d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 9990d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 10000d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 10010d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 10020d812f77STao Ma } else { 10030d812f77STao Ma header->h_magic = cpu_to_le32(0); 10040d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 10050d812f77STao Ma } 10060d812f77STao Ma return 0; 10070d812f77STao Ma } 10080d812f77STao Ma 10090d812f77STao Ma static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 1010617ba13bSMingming Cao struct ext4_xattr_info *i, 1011617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 1012ac27a0ecSDave Kleikamp { 1013617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 1014617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 1015ac27a0ecSDave Kleikamp int error; 1016ac27a0ecSDave Kleikamp 1017617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 1018ac27a0ecSDave Kleikamp return -ENOSPC; 1019617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 1020ac27a0ecSDave Kleikamp if (error) 1021ac27a0ecSDave Kleikamp return error; 1022617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 1023ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 1024617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 102519f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 1026ac27a0ecSDave Kleikamp } else { 1027ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 102819f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 1029ac27a0ecSDave Kleikamp } 1030ac27a0ecSDave Kleikamp return 0; 1031ac27a0ecSDave Kleikamp } 1032ac27a0ecSDave Kleikamp 1033ac27a0ecSDave Kleikamp /* 1034617ba13bSMingming Cao * ext4_xattr_set_handle() 1035ac27a0ecSDave Kleikamp * 10366e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 1037ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 1038ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 1039ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 1040ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 1041ac27a0ecSDave Kleikamp * previous to the call, respectively. 1042ac27a0ecSDave Kleikamp * 1043ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1044ac27a0ecSDave Kleikamp */ 1045ac27a0ecSDave Kleikamp int 1046617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 1047ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 1048ac27a0ecSDave Kleikamp int flags) 1049ac27a0ecSDave Kleikamp { 1050617ba13bSMingming Cao struct ext4_xattr_info i = { 1051ac27a0ecSDave Kleikamp .name_index = name_index, 1052ac27a0ecSDave Kleikamp .name = name, 1053ac27a0ecSDave Kleikamp .value = value, 1054ac27a0ecSDave Kleikamp .value_len = value_len, 1055ac27a0ecSDave Kleikamp 1056ac27a0ecSDave Kleikamp }; 1057617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 1058ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1059ac27a0ecSDave Kleikamp }; 1060617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 1061ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1062ac27a0ecSDave Kleikamp }; 10634d20c685SKalpak Shah unsigned long no_expand; 1064ac27a0ecSDave Kleikamp int error; 1065ac27a0ecSDave Kleikamp 1066ac27a0ecSDave Kleikamp if (!name) 1067ac27a0ecSDave Kleikamp return -EINVAL; 1068ac27a0ecSDave Kleikamp if (strlen(name) > 255) 1069ac27a0ecSDave Kleikamp return -ERANGE; 1070617ba13bSMingming Cao down_write(&EXT4_I(inode)->xattr_sem); 107119f5fb7aSTheodore Ts'o no_expand = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND); 107219f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND); 10734d20c685SKalpak Shah 107466543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 107586ebfd08SEric Sandeen if (error) 107686ebfd08SEric Sandeen goto cleanup; 107786ebfd08SEric Sandeen 107819f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 1079617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 1080617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 108119f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 1082ac27a0ecSDave Kleikamp } 1083ac27a0ecSDave Kleikamp 1084617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 1085ac27a0ecSDave Kleikamp if (error) 1086ac27a0ecSDave Kleikamp goto cleanup; 1087ac27a0ecSDave Kleikamp if (is.s.not_found) 1088617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 1089ac27a0ecSDave Kleikamp if (error) 1090ac27a0ecSDave Kleikamp goto cleanup; 1091ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 1092ac27a0ecSDave Kleikamp error = -ENODATA; 1093ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 1094ac27a0ecSDave Kleikamp goto cleanup; 1095ac27a0ecSDave Kleikamp error = 0; 1096ac27a0ecSDave Kleikamp if (!value) 1097ac27a0ecSDave Kleikamp goto cleanup; 1098ac27a0ecSDave Kleikamp } else { 1099ac27a0ecSDave Kleikamp error = -EEXIST; 1100ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 1101ac27a0ecSDave Kleikamp goto cleanup; 1102ac27a0ecSDave Kleikamp } 1103ac27a0ecSDave Kleikamp if (!value) { 1104ac27a0ecSDave Kleikamp if (!is.s.not_found) 1105617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1106ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 1107617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1108ac27a0ecSDave Kleikamp } else { 1109617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1110ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 1111ac27a0ecSDave Kleikamp i.value = NULL; 1112617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1113ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 11147e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 11157e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 11167e01c8e5STiger Yang if (error) 11177e01c8e5STiger Yang goto cleanup; 11187e01c8e5STiger Yang } 1119617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1120ac27a0ecSDave Kleikamp if (error) 1121ac27a0ecSDave Kleikamp goto cleanup; 1122ac27a0ecSDave Kleikamp if (!is.s.not_found) { 1123ac27a0ecSDave Kleikamp i.value = NULL; 1124617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, 1125ac27a0ecSDave Kleikamp &is); 1126ac27a0ecSDave Kleikamp } 1127ac27a0ecSDave Kleikamp } 1128ac27a0ecSDave Kleikamp } 1129ac27a0ecSDave Kleikamp if (!error) { 1130617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 1131ef7f3835SKalpak Shah inode->i_ctime = ext4_current_time(inode); 11326dd4ee7cSKalpak Shah if (!value) 113319f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); 1134617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 1135ac27a0ecSDave Kleikamp /* 1136617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 1137ac27a0ecSDave Kleikamp * error != 0. 1138ac27a0ecSDave Kleikamp */ 1139ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 1140ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 11410390131bSFrank Mayhar ext4_handle_sync(handle); 1142ac27a0ecSDave Kleikamp } 1143ac27a0ecSDave Kleikamp 1144ac27a0ecSDave Kleikamp cleanup: 1145ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 1146ac27a0ecSDave Kleikamp brelse(bs.bh); 11474d20c685SKalpak Shah if (no_expand == 0) 114819f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); 1149617ba13bSMingming Cao up_write(&EXT4_I(inode)->xattr_sem); 1150ac27a0ecSDave Kleikamp return error; 1151ac27a0ecSDave Kleikamp } 1152ac27a0ecSDave Kleikamp 1153ac27a0ecSDave Kleikamp /* 1154617ba13bSMingming Cao * ext4_xattr_set() 1155ac27a0ecSDave Kleikamp * 1156617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 1157ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 1158ac27a0ecSDave Kleikamp * 1159ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1160ac27a0ecSDave Kleikamp */ 1161ac27a0ecSDave Kleikamp int 1162617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 1163ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 1164ac27a0ecSDave Kleikamp { 1165ac27a0ecSDave Kleikamp handle_t *handle; 1166ac27a0ecSDave Kleikamp int error, retries = 0; 11670d812f77STao Ma int credits = EXT4_DATA_TRANS_BLOCKS(inode->i_sb); 1168ac27a0ecSDave Kleikamp 1169ac27a0ecSDave Kleikamp retry: 11700d812f77STao Ma /* 11710d812f77STao Ma * In case of inline data, we may push out the data to a block, 11720d812f77STao Ma * So reserve the journal space first. 11730d812f77STao Ma */ 11740d812f77STao Ma if (ext4_has_inline_data(inode)) 11750d812f77STao Ma credits += ext4_writepage_trans_blocks(inode) + 1; 11760d812f77STao Ma 11770d812f77STao Ma handle = ext4_journal_start(inode, credits); 1178ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 1179ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 1180ac27a0ecSDave Kleikamp } else { 1181ac27a0ecSDave Kleikamp int error2; 1182ac27a0ecSDave Kleikamp 1183617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 1184ac27a0ecSDave Kleikamp value, value_len, flags); 1185617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 1186ac27a0ecSDave Kleikamp if (error == -ENOSPC && 1187617ba13bSMingming Cao ext4_should_retry_alloc(inode->i_sb, &retries)) 1188ac27a0ecSDave Kleikamp goto retry; 1189ac27a0ecSDave Kleikamp if (error == 0) 1190ac27a0ecSDave Kleikamp error = error2; 1191ac27a0ecSDave Kleikamp } 1192ac27a0ecSDave Kleikamp 1193ac27a0ecSDave Kleikamp return error; 1194ac27a0ecSDave Kleikamp } 1195ac27a0ecSDave Kleikamp 1196ac27a0ecSDave Kleikamp /* 11976dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 11986dd4ee7cSKalpak Shah * i_extra_isize. 11996dd4ee7cSKalpak Shah */ 12006dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 12016dd4ee7cSKalpak Shah int value_offs_shift, void *to, 12026dd4ee7cSKalpak Shah void *from, size_t n, int blocksize) 12036dd4ee7cSKalpak Shah { 12046dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 12056dd4ee7cSKalpak Shah int new_offs; 12066dd4ee7cSKalpak Shah 12076dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 12086dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 12096dd4ee7cSKalpak Shah if (!last->e_value_block && last->e_value_size) { 12106dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 12116dd4ee7cSKalpak Shah value_offs_shift; 12126dd4ee7cSKalpak Shah BUG_ON(new_offs + le32_to_cpu(last->e_value_size) 12136dd4ee7cSKalpak Shah > blocksize); 12146dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 12156dd4ee7cSKalpak Shah } 12166dd4ee7cSKalpak Shah } 12176dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 12186dd4ee7cSKalpak Shah memmove(to, from, n); 12196dd4ee7cSKalpak Shah } 12206dd4ee7cSKalpak Shah 12216dd4ee7cSKalpak Shah /* 12226dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 12236dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 12246dd4ee7cSKalpak Shah */ 12256dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 12266dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 12276dd4ee7cSKalpak Shah { 12286dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 12296dd4ee7cSKalpak Shah struct ext4_xattr_entry *entry, *last, *first; 12306dd4ee7cSKalpak Shah struct buffer_head *bh = NULL; 12316dd4ee7cSKalpak Shah struct ext4_xattr_ibody_find *is = NULL; 12326dd4ee7cSKalpak Shah struct ext4_xattr_block_find *bs = NULL; 12336dd4ee7cSKalpak Shah char *buffer = NULL, *b_entry_name = NULL; 12346dd4ee7cSKalpak Shah size_t min_offs, free; 12356dd4ee7cSKalpak Shah int total_ino, total_blk; 12366dd4ee7cSKalpak Shah void *base, *start, *end; 12376dd4ee7cSKalpak Shah int extra_isize = 0, error = 0, tried_min_extra_isize = 0; 1238ac39849dSAneesh Kumar K.V int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); 12396dd4ee7cSKalpak Shah 12406dd4ee7cSKalpak Shah down_write(&EXT4_I(inode)->xattr_sem); 12416dd4ee7cSKalpak Shah retry: 12426dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) { 12436dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 12446dd4ee7cSKalpak Shah return 0; 12456dd4ee7cSKalpak Shah } 12466dd4ee7cSKalpak Shah 12476dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 12486dd4ee7cSKalpak Shah entry = IFIRST(header); 12496dd4ee7cSKalpak Shah 12506dd4ee7cSKalpak Shah /* 12516dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 12526dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 12536dd4ee7cSKalpak Shah */ 12546dd4ee7cSKalpak Shah 12556dd4ee7cSKalpak Shah base = start = entry; 12566dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 12576dd4ee7cSKalpak Shah min_offs = end - base; 12586dd4ee7cSKalpak Shah last = entry; 12596dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 12606dd4ee7cSKalpak Shah 12616dd4ee7cSKalpak Shah free = ext4_xattr_free_space(last, &min_offs, base, &total_ino); 12626dd4ee7cSKalpak Shah if (free >= new_extra_isize) { 12636dd4ee7cSKalpak Shah entry = IFIRST(header); 12646dd4ee7cSKalpak Shah ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize 12656dd4ee7cSKalpak Shah - new_extra_isize, (void *)raw_inode + 12666dd4ee7cSKalpak Shah EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 12676dd4ee7cSKalpak Shah (void *)header, total_ino, 12686dd4ee7cSKalpak Shah inode->i_sb->s_blocksize); 12696dd4ee7cSKalpak Shah EXT4_I(inode)->i_extra_isize = new_extra_isize; 12706dd4ee7cSKalpak Shah error = 0; 12716dd4ee7cSKalpak Shah goto cleanup; 12726dd4ee7cSKalpak Shah } 12736dd4ee7cSKalpak Shah 12746dd4ee7cSKalpak Shah /* 12756dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 12766dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 12776dd4ee7cSKalpak Shah */ 12786dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 12796dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 12806dd4ee7cSKalpak Shah error = -EIO; 12816dd4ee7cSKalpak Shah if (!bh) 12826dd4ee7cSKalpak Shah goto cleanup; 1283cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 128424676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 128524676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 12866dd4ee7cSKalpak Shah error = -EIO; 12876dd4ee7cSKalpak Shah goto cleanup; 12886dd4ee7cSKalpak Shah } 12896dd4ee7cSKalpak Shah base = BHDR(bh); 12906dd4ee7cSKalpak Shah first = BFIRST(bh); 12916dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 12926dd4ee7cSKalpak Shah min_offs = end - base; 12936dd4ee7cSKalpak Shah free = ext4_xattr_free_space(first, &min_offs, base, 12946dd4ee7cSKalpak Shah &total_blk); 12956dd4ee7cSKalpak Shah if (free < new_extra_isize) { 12966dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 12976dd4ee7cSKalpak Shah tried_min_extra_isize++; 12986dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 12996dd4ee7cSKalpak Shah brelse(bh); 13006dd4ee7cSKalpak Shah goto retry; 13016dd4ee7cSKalpak Shah } 13026dd4ee7cSKalpak Shah error = -1; 13036dd4ee7cSKalpak Shah goto cleanup; 13046dd4ee7cSKalpak Shah } 13056dd4ee7cSKalpak Shah } else { 13066dd4ee7cSKalpak Shah free = inode->i_sb->s_blocksize; 13076dd4ee7cSKalpak Shah } 13086dd4ee7cSKalpak Shah 13096dd4ee7cSKalpak Shah while (new_extra_isize > 0) { 13106dd4ee7cSKalpak Shah size_t offs, size, entry_size; 13116dd4ee7cSKalpak Shah struct ext4_xattr_entry *small_entry = NULL; 13126dd4ee7cSKalpak Shah struct ext4_xattr_info i = { 13136dd4ee7cSKalpak Shah .value = NULL, 13146dd4ee7cSKalpak Shah .value_len = 0, 13156dd4ee7cSKalpak Shah }; 13166dd4ee7cSKalpak Shah unsigned int total_size; /* EA entry size + value size */ 13176dd4ee7cSKalpak Shah unsigned int shift_bytes; /* No. of bytes to shift EAs by? */ 13186dd4ee7cSKalpak Shah unsigned int min_total_size = ~0U; 13196dd4ee7cSKalpak Shah 13206dd4ee7cSKalpak Shah is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 13216dd4ee7cSKalpak Shah bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 13226dd4ee7cSKalpak Shah if (!is || !bs) { 13236dd4ee7cSKalpak Shah error = -ENOMEM; 13246dd4ee7cSKalpak Shah goto cleanup; 13256dd4ee7cSKalpak Shah } 13266dd4ee7cSKalpak Shah 13276dd4ee7cSKalpak Shah is->s.not_found = -ENODATA; 13286dd4ee7cSKalpak Shah bs->s.not_found = -ENODATA; 13296dd4ee7cSKalpak Shah is->iloc.bh = NULL; 13306dd4ee7cSKalpak Shah bs->bh = NULL; 13316dd4ee7cSKalpak Shah 13326dd4ee7cSKalpak Shah last = IFIRST(header); 13336dd4ee7cSKalpak Shah /* Find the entry best suited to be pushed into EA block */ 13346dd4ee7cSKalpak Shah entry = NULL; 13356dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 13366dd4ee7cSKalpak Shah total_size = 13376dd4ee7cSKalpak Shah EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + 13386dd4ee7cSKalpak Shah EXT4_XATTR_LEN(last->e_name_len); 13396dd4ee7cSKalpak Shah if (total_size <= free && total_size < min_total_size) { 13406dd4ee7cSKalpak Shah if (total_size < new_extra_isize) { 13416dd4ee7cSKalpak Shah small_entry = last; 13426dd4ee7cSKalpak Shah } else { 13436dd4ee7cSKalpak Shah entry = last; 13446dd4ee7cSKalpak Shah min_total_size = total_size; 13456dd4ee7cSKalpak Shah } 13466dd4ee7cSKalpak Shah } 13476dd4ee7cSKalpak Shah } 13486dd4ee7cSKalpak Shah 13496dd4ee7cSKalpak Shah if (entry == NULL) { 13506dd4ee7cSKalpak Shah if (small_entry) { 13516dd4ee7cSKalpak Shah entry = small_entry; 13526dd4ee7cSKalpak Shah } else { 13536dd4ee7cSKalpak Shah if (!tried_min_extra_isize && 13546dd4ee7cSKalpak Shah s_min_extra_isize) { 13556dd4ee7cSKalpak Shah tried_min_extra_isize++; 13566dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 13576dd4ee7cSKalpak Shah goto retry; 13586dd4ee7cSKalpak Shah } 13596dd4ee7cSKalpak Shah error = -1; 13606dd4ee7cSKalpak Shah goto cleanup; 13616dd4ee7cSKalpak Shah } 13626dd4ee7cSKalpak Shah } 13636dd4ee7cSKalpak Shah offs = le16_to_cpu(entry->e_value_offs); 13646dd4ee7cSKalpak Shah size = le32_to_cpu(entry->e_value_size); 13656dd4ee7cSKalpak Shah entry_size = EXT4_XATTR_LEN(entry->e_name_len); 13666dd4ee7cSKalpak Shah i.name_index = entry->e_name_index, 13676dd4ee7cSKalpak Shah buffer = kmalloc(EXT4_XATTR_SIZE(size), GFP_NOFS); 13686dd4ee7cSKalpak Shah b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 13696dd4ee7cSKalpak Shah if (!buffer || !b_entry_name) { 13706dd4ee7cSKalpak Shah error = -ENOMEM; 13716dd4ee7cSKalpak Shah goto cleanup; 13726dd4ee7cSKalpak Shah } 13736dd4ee7cSKalpak Shah /* Save the entry name and the entry value */ 13746dd4ee7cSKalpak Shah memcpy(buffer, (void *)IFIRST(header) + offs, 13756dd4ee7cSKalpak Shah EXT4_XATTR_SIZE(size)); 13766dd4ee7cSKalpak Shah memcpy(b_entry_name, entry->e_name, entry->e_name_len); 13776dd4ee7cSKalpak Shah b_entry_name[entry->e_name_len] = '\0'; 13786dd4ee7cSKalpak Shah i.name = b_entry_name; 13796dd4ee7cSKalpak Shah 13806dd4ee7cSKalpak Shah error = ext4_get_inode_loc(inode, &is->iloc); 13816dd4ee7cSKalpak Shah if (error) 13826dd4ee7cSKalpak Shah goto cleanup; 13836dd4ee7cSKalpak Shah 13846dd4ee7cSKalpak Shah error = ext4_xattr_ibody_find(inode, &i, is); 13856dd4ee7cSKalpak Shah if (error) 13866dd4ee7cSKalpak Shah goto cleanup; 13876dd4ee7cSKalpak Shah 13886dd4ee7cSKalpak Shah /* Remove the chosen entry from the inode */ 13896dd4ee7cSKalpak Shah error = ext4_xattr_ibody_set(handle, inode, &i, is); 13909aaab058SRoel Kluin if (error) 13919aaab058SRoel Kluin goto cleanup; 13926dd4ee7cSKalpak Shah 13936dd4ee7cSKalpak Shah entry = IFIRST(header); 13946dd4ee7cSKalpak Shah if (entry_size + EXT4_XATTR_SIZE(size) >= new_extra_isize) 13956dd4ee7cSKalpak Shah shift_bytes = new_extra_isize; 13966dd4ee7cSKalpak Shah else 13976dd4ee7cSKalpak Shah shift_bytes = entry_size + size; 13986dd4ee7cSKalpak Shah /* Adjust the offsets and shift the remaining entries ahead */ 13996dd4ee7cSKalpak Shah ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize - 14006dd4ee7cSKalpak Shah shift_bytes, (void *)raw_inode + 14016dd4ee7cSKalpak Shah EXT4_GOOD_OLD_INODE_SIZE + extra_isize + shift_bytes, 14026dd4ee7cSKalpak Shah (void *)header, total_ino - entry_size, 14036dd4ee7cSKalpak Shah inode->i_sb->s_blocksize); 14046dd4ee7cSKalpak Shah 14056dd4ee7cSKalpak Shah extra_isize += shift_bytes; 14066dd4ee7cSKalpak Shah new_extra_isize -= shift_bytes; 14076dd4ee7cSKalpak Shah EXT4_I(inode)->i_extra_isize = extra_isize; 14086dd4ee7cSKalpak Shah 14096dd4ee7cSKalpak Shah i.name = b_entry_name; 14106dd4ee7cSKalpak Shah i.value = buffer; 1411ac39849dSAneesh Kumar K.V i.value_len = size; 14126dd4ee7cSKalpak Shah error = ext4_xattr_block_find(inode, &i, bs); 14136dd4ee7cSKalpak Shah if (error) 14146dd4ee7cSKalpak Shah goto cleanup; 14156dd4ee7cSKalpak Shah 14166dd4ee7cSKalpak Shah /* Add entry which was removed from the inode into the block */ 14176dd4ee7cSKalpak Shah error = ext4_xattr_block_set(handle, inode, &i, bs); 14186dd4ee7cSKalpak Shah if (error) 14196dd4ee7cSKalpak Shah goto cleanup; 14206dd4ee7cSKalpak Shah kfree(b_entry_name); 14216dd4ee7cSKalpak Shah kfree(buffer); 1422d3533d72SJulia Lawall b_entry_name = NULL; 1423d3533d72SJulia Lawall buffer = NULL; 14246dd4ee7cSKalpak Shah brelse(is->iloc.bh); 14256dd4ee7cSKalpak Shah kfree(is); 14266dd4ee7cSKalpak Shah kfree(bs); 14276dd4ee7cSKalpak Shah } 14286dd4ee7cSKalpak Shah brelse(bh); 14296dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 14306dd4ee7cSKalpak Shah return 0; 14316dd4ee7cSKalpak Shah 14326dd4ee7cSKalpak Shah cleanup: 14336dd4ee7cSKalpak Shah kfree(b_entry_name); 14346dd4ee7cSKalpak Shah kfree(buffer); 14356dd4ee7cSKalpak Shah if (is) 14366dd4ee7cSKalpak Shah brelse(is->iloc.bh); 14376dd4ee7cSKalpak Shah kfree(is); 14386dd4ee7cSKalpak Shah kfree(bs); 14396dd4ee7cSKalpak Shah brelse(bh); 14406dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 14416dd4ee7cSKalpak Shah return error; 14426dd4ee7cSKalpak Shah } 14436dd4ee7cSKalpak Shah 14446dd4ee7cSKalpak Shah 14456dd4ee7cSKalpak Shah 14466dd4ee7cSKalpak Shah /* 1447617ba13bSMingming Cao * ext4_xattr_delete_inode() 1448ac27a0ecSDave Kleikamp * 1449ac27a0ecSDave Kleikamp * Free extended attribute resources associated with this inode. This 1450ac27a0ecSDave Kleikamp * is called immediately before an inode is freed. We have exclusive 1451ac27a0ecSDave Kleikamp * access to the inode. 1452ac27a0ecSDave Kleikamp */ 1453ac27a0ecSDave Kleikamp void 1454617ba13bSMingming Cao ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) 1455ac27a0ecSDave Kleikamp { 1456ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 1457ac27a0ecSDave Kleikamp 1458617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 1459ac27a0ecSDave Kleikamp goto cleanup; 1460617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 1461ac27a0ecSDave Kleikamp if (!bh) { 146224676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 146324676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1464ac27a0ecSDave Kleikamp goto cleanup; 1465ac27a0ecSDave Kleikamp } 1466617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 1467ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) { 146824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 146924676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1470ac27a0ecSDave Kleikamp goto cleanup; 1471ac27a0ecSDave Kleikamp } 1472617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bh); 1473617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 1474ac27a0ecSDave Kleikamp 1475ac27a0ecSDave Kleikamp cleanup: 1476ac27a0ecSDave Kleikamp brelse(bh); 1477ac27a0ecSDave Kleikamp } 1478ac27a0ecSDave Kleikamp 1479ac27a0ecSDave Kleikamp /* 1480617ba13bSMingming Cao * ext4_xattr_put_super() 1481ac27a0ecSDave Kleikamp * 1482ac27a0ecSDave Kleikamp * This is called when a file system is unmounted. 1483ac27a0ecSDave Kleikamp */ 1484ac27a0ecSDave Kleikamp void 1485617ba13bSMingming Cao ext4_xattr_put_super(struct super_block *sb) 1486ac27a0ecSDave Kleikamp { 1487ac27a0ecSDave Kleikamp mb_cache_shrink(sb->s_bdev); 1488ac27a0ecSDave Kleikamp } 1489ac27a0ecSDave Kleikamp 1490ac27a0ecSDave Kleikamp /* 1491617ba13bSMingming Cao * ext4_xattr_cache_insert() 1492ac27a0ecSDave Kleikamp * 1493ac27a0ecSDave Kleikamp * Create a new entry in the extended attribute cache, and insert 1494ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 1495ac27a0ecSDave Kleikamp * 1496ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1497ac27a0ecSDave Kleikamp */ 1498ac27a0ecSDave Kleikamp static void 1499617ba13bSMingming Cao ext4_xattr_cache_insert(struct buffer_head *bh) 1500ac27a0ecSDave Kleikamp { 1501ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(BHDR(bh)->h_hash); 1502ac27a0ecSDave Kleikamp struct mb_cache_entry *ce; 1503ac27a0ecSDave Kleikamp int error; 1504ac27a0ecSDave Kleikamp 1505335e92e8SJan Kara ce = mb_cache_entry_alloc(ext4_xattr_cache, GFP_NOFS); 1506ac27a0ecSDave Kleikamp if (!ce) { 1507ac27a0ecSDave Kleikamp ea_bdebug(bh, "out of memory"); 1508ac27a0ecSDave Kleikamp return; 1509ac27a0ecSDave Kleikamp } 15102aec7c52SAndreas Gruenbacher error = mb_cache_entry_insert(ce, bh->b_bdev, bh->b_blocknr, hash); 1511ac27a0ecSDave Kleikamp if (error) { 1512ac27a0ecSDave Kleikamp mb_cache_entry_free(ce); 1513ac27a0ecSDave Kleikamp if (error == -EBUSY) { 1514ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 1515ac27a0ecSDave Kleikamp error = 0; 1516ac27a0ecSDave Kleikamp } 1517ac27a0ecSDave Kleikamp } else { 1518ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 1519ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 1520ac27a0ecSDave Kleikamp } 1521ac27a0ecSDave Kleikamp } 1522ac27a0ecSDave Kleikamp 1523ac27a0ecSDave Kleikamp /* 1524617ba13bSMingming Cao * ext4_xattr_cmp() 1525ac27a0ecSDave Kleikamp * 1526ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 1527ac27a0ecSDave Kleikamp * 1528ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 1529ac27a0ecSDave Kleikamp * a negative error number on errors. 1530ac27a0ecSDave Kleikamp */ 1531ac27a0ecSDave Kleikamp static int 1532617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 1533617ba13bSMingming Cao struct ext4_xattr_header *header2) 1534ac27a0ecSDave Kleikamp { 1535617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 1536ac27a0ecSDave Kleikamp 1537ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 1538ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 1539ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 1540ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 1541ac27a0ecSDave Kleikamp return 1; 1542ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 1543ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 1544ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 1545ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 1546ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 1547ac27a0ecSDave Kleikamp return 1; 1548ac27a0ecSDave Kleikamp if (entry1->e_value_block != 0 || entry2->e_value_block != 0) 1549ac27a0ecSDave Kleikamp return -EIO; 1550ac27a0ecSDave Kleikamp if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 1551ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 1552ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 1553ac27a0ecSDave Kleikamp return 1; 1554ac27a0ecSDave Kleikamp 1555617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 1556617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 1557ac27a0ecSDave Kleikamp } 1558ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 1559ac27a0ecSDave Kleikamp return 1; 1560ac27a0ecSDave Kleikamp return 0; 1561ac27a0ecSDave Kleikamp } 1562ac27a0ecSDave Kleikamp 1563ac27a0ecSDave Kleikamp /* 1564617ba13bSMingming Cao * ext4_xattr_cache_find() 1565ac27a0ecSDave Kleikamp * 1566ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 1567ac27a0ecSDave Kleikamp * 1568ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 1569ac27a0ecSDave Kleikamp * not found or an error occurred. 1570ac27a0ecSDave Kleikamp */ 1571ac27a0ecSDave Kleikamp static struct buffer_head * 1572617ba13bSMingming Cao ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, 1573ac27a0ecSDave Kleikamp struct mb_cache_entry **pce) 1574ac27a0ecSDave Kleikamp { 1575ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 1576ac27a0ecSDave Kleikamp struct mb_cache_entry *ce; 1577ac27a0ecSDave Kleikamp 1578ac27a0ecSDave Kleikamp if (!header->h_hash) 1579ac27a0ecSDave Kleikamp return NULL; /* never share */ 1580ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 1581ac27a0ecSDave Kleikamp again: 15822aec7c52SAndreas Gruenbacher ce = mb_cache_entry_find_first(ext4_xattr_cache, inode->i_sb->s_bdev, 15832aec7c52SAndreas Gruenbacher hash); 1584ac27a0ecSDave Kleikamp while (ce) { 1585ac27a0ecSDave Kleikamp struct buffer_head *bh; 1586ac27a0ecSDave Kleikamp 1587ac27a0ecSDave Kleikamp if (IS_ERR(ce)) { 1588ac27a0ecSDave Kleikamp if (PTR_ERR(ce) == -EAGAIN) 1589ac27a0ecSDave Kleikamp goto again; 1590ac27a0ecSDave Kleikamp break; 1591ac27a0ecSDave Kleikamp } 1592ac27a0ecSDave Kleikamp bh = sb_bread(inode->i_sb, ce->e_block); 1593ac27a0ecSDave Kleikamp if (!bh) { 159424676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 159524676da4STheodore Ts'o (unsigned long) ce->e_block); 1596ac27a0ecSDave Kleikamp } else if (le32_to_cpu(BHDR(bh)->h_refcount) >= 1597617ba13bSMingming Cao EXT4_XATTR_REFCOUNT_MAX) { 1598ac27a0ecSDave Kleikamp ea_idebug(inode, "block %lu refcount %d>=%d", 1599ac27a0ecSDave Kleikamp (unsigned long) ce->e_block, 1600ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount), 1601617ba13bSMingming Cao EXT4_XATTR_REFCOUNT_MAX); 1602617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 1603ac27a0ecSDave Kleikamp *pce = ce; 1604ac27a0ecSDave Kleikamp return bh; 1605ac27a0ecSDave Kleikamp } 1606ac27a0ecSDave Kleikamp brelse(bh); 16072aec7c52SAndreas Gruenbacher ce = mb_cache_entry_find_next(ce, inode->i_sb->s_bdev, hash); 1608ac27a0ecSDave Kleikamp } 1609ac27a0ecSDave Kleikamp return NULL; 1610ac27a0ecSDave Kleikamp } 1611ac27a0ecSDave Kleikamp 1612ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 1613ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 1614ac27a0ecSDave Kleikamp 1615ac27a0ecSDave Kleikamp /* 1616617ba13bSMingming Cao * ext4_xattr_hash_entry() 1617ac27a0ecSDave Kleikamp * 1618ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 1619ac27a0ecSDave Kleikamp */ 1620617ba13bSMingming Cao static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, 1621617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1622ac27a0ecSDave Kleikamp { 1623ac27a0ecSDave Kleikamp __u32 hash = 0; 1624ac27a0ecSDave Kleikamp char *name = entry->e_name; 1625ac27a0ecSDave Kleikamp int n; 1626ac27a0ecSDave Kleikamp 1627ac27a0ecSDave Kleikamp for (n = 0; n < entry->e_name_len; n++) { 1628ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 1629ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 1630ac27a0ecSDave Kleikamp *name++; 1631ac27a0ecSDave Kleikamp } 1632ac27a0ecSDave Kleikamp 1633ac27a0ecSDave Kleikamp if (entry->e_value_block == 0 && entry->e_value_size != 0) { 1634ac27a0ecSDave Kleikamp __le32 *value = (__le32 *)((char *)header + 1635ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs)); 1636ac27a0ecSDave Kleikamp for (n = (le32_to_cpu(entry->e_value_size) + 1637617ba13bSMingming Cao EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { 1638ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 1639ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 1640ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 1641ac27a0ecSDave Kleikamp } 1642ac27a0ecSDave Kleikamp } 1643ac27a0ecSDave Kleikamp entry->e_hash = cpu_to_le32(hash); 1644ac27a0ecSDave Kleikamp } 1645ac27a0ecSDave Kleikamp 1646ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 1647ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 1648ac27a0ecSDave Kleikamp 1649ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 1650ac27a0ecSDave Kleikamp 1651ac27a0ecSDave Kleikamp /* 1652617ba13bSMingming Cao * ext4_xattr_rehash() 1653ac27a0ecSDave Kleikamp * 1654ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 1655ac27a0ecSDave Kleikamp */ 1656617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *header, 1657617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1658ac27a0ecSDave Kleikamp { 1659617ba13bSMingming Cao struct ext4_xattr_entry *here; 1660ac27a0ecSDave Kleikamp __u32 hash = 0; 1661ac27a0ecSDave Kleikamp 1662617ba13bSMingming Cao ext4_xattr_hash_entry(header, entry); 1663ac27a0ecSDave Kleikamp here = ENTRY(header+1); 1664ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 1665ac27a0ecSDave Kleikamp if (!here->e_hash) { 1666ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 1667ac27a0ecSDave Kleikamp hash = 0; 1668ac27a0ecSDave Kleikamp break; 1669ac27a0ecSDave Kleikamp } 1670ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 1671ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 1672ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 1673617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 1674ac27a0ecSDave Kleikamp } 1675ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 1676ac27a0ecSDave Kleikamp } 1677ac27a0ecSDave Kleikamp 1678ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 1679ac27a0ecSDave Kleikamp 1680ac27a0ecSDave Kleikamp int __init 16815dabfc78STheodore Ts'o ext4_init_xattr(void) 1682ac27a0ecSDave Kleikamp { 16832aec7c52SAndreas Gruenbacher ext4_xattr_cache = mb_cache_create("ext4_xattr", 6); 1684617ba13bSMingming Cao if (!ext4_xattr_cache) 1685ac27a0ecSDave Kleikamp return -ENOMEM; 1686ac27a0ecSDave Kleikamp return 0; 1687ac27a0ecSDave Kleikamp } 1688ac27a0ecSDave Kleikamp 1689ac27a0ecSDave Kleikamp void 16905dabfc78STheodore Ts'o ext4_exit_xattr(void) 1691ac27a0ecSDave Kleikamp { 1692617ba13bSMingming Cao if (ext4_xattr_cache) 1693617ba13bSMingming Cao mb_cache_destroy(ext4_xattr_cache); 1694617ba13bSMingming Cao ext4_xattr_cache = NULL; 1695ac27a0ecSDave Kleikamp } 1696