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 #define BHDR(bh) ((struct ext4_xattr_header *)((bh)->b_data)) 65617ba13bSMingming Cao #define ENTRY(ptr) ((struct ext4_xattr_entry *)(ptr)) 66ac27a0ecSDave Kleikamp #define BFIRST(bh) ENTRY(BHDR(bh)+1) 67ac27a0ecSDave Kleikamp #define IS_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0) 68ac27a0ecSDave Kleikamp 69617ba13bSMingming Cao #ifdef EXT4_XATTR_DEBUG 70ac27a0ecSDave Kleikamp # define ea_idebug(inode, f...) do { \ 71ac27a0ecSDave Kleikamp printk(KERN_DEBUG "inode %s:%lu: ", \ 72ac27a0ecSDave Kleikamp inode->i_sb->s_id, inode->i_ino); \ 73ac27a0ecSDave Kleikamp printk(f); \ 74ac27a0ecSDave Kleikamp printk("\n"); \ 75ac27a0ecSDave Kleikamp } while (0) 76ac27a0ecSDave Kleikamp # define ea_bdebug(bh, f...) do { \ 77ac27a0ecSDave Kleikamp char b[BDEVNAME_SIZE]; \ 78ac27a0ecSDave Kleikamp printk(KERN_DEBUG "block %s:%lu: ", \ 79ac27a0ecSDave Kleikamp bdevname(bh->b_bdev, b), \ 80ac27a0ecSDave Kleikamp (unsigned long) bh->b_blocknr); \ 81ac27a0ecSDave Kleikamp printk(f); \ 82ac27a0ecSDave Kleikamp printk("\n"); \ 83ac27a0ecSDave Kleikamp } while (0) 84ac27a0ecSDave Kleikamp #else 85ac27a0ecSDave Kleikamp # define ea_idebug(f...) 86ac27a0ecSDave Kleikamp # define ea_bdebug(f...) 87ac27a0ecSDave Kleikamp #endif 88ac27a0ecSDave Kleikamp 89617ba13bSMingming Cao static void ext4_xattr_cache_insert(struct buffer_head *); 90617ba13bSMingming Cao static struct buffer_head *ext4_xattr_cache_find(struct inode *, 91617ba13bSMingming Cao struct ext4_xattr_header *, 92ac27a0ecSDave Kleikamp struct mb_cache_entry **); 93617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *, 94617ba13bSMingming Cao struct ext4_xattr_entry *); 95d3a95d47SMingming Cao static int ext4_xattr_list(struct inode *inode, char *buffer, 96d3a95d47SMingming Cao size_t buffer_size); 97ac27a0ecSDave Kleikamp 98617ba13bSMingming Cao static struct mb_cache *ext4_xattr_cache; 99ac27a0ecSDave Kleikamp 100617ba13bSMingming Cao static struct xattr_handler *ext4_xattr_handler_map[] = { 101617ba13bSMingming Cao [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, 102617ba13bSMingming Cao #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 103617ba13bSMingming Cao [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &ext4_xattr_acl_access_handler, 104617ba13bSMingming Cao [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &ext4_xattr_acl_default_handler, 105ac27a0ecSDave Kleikamp #endif 106617ba13bSMingming Cao [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, 107617ba13bSMingming Cao #ifdef CONFIG_EXT4DEV_FS_SECURITY 108617ba13bSMingming Cao [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, 109ac27a0ecSDave Kleikamp #endif 110ac27a0ecSDave Kleikamp }; 111ac27a0ecSDave Kleikamp 112617ba13bSMingming Cao struct xattr_handler *ext4_xattr_handlers[] = { 113617ba13bSMingming Cao &ext4_xattr_user_handler, 114617ba13bSMingming Cao &ext4_xattr_trusted_handler, 115617ba13bSMingming Cao #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 116617ba13bSMingming Cao &ext4_xattr_acl_access_handler, 117617ba13bSMingming Cao &ext4_xattr_acl_default_handler, 118ac27a0ecSDave Kleikamp #endif 119617ba13bSMingming Cao #ifdef CONFIG_EXT4DEV_FS_SECURITY 120617ba13bSMingming Cao &ext4_xattr_security_handler, 121ac27a0ecSDave Kleikamp #endif 122ac27a0ecSDave Kleikamp NULL 123ac27a0ecSDave Kleikamp }; 124ac27a0ecSDave Kleikamp 125ac27a0ecSDave Kleikamp static inline struct xattr_handler * 126617ba13bSMingming Cao ext4_xattr_handler(int name_index) 127ac27a0ecSDave Kleikamp { 128ac27a0ecSDave Kleikamp struct xattr_handler *handler = NULL; 129ac27a0ecSDave Kleikamp 130617ba13bSMingming Cao if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) 131617ba13bSMingming Cao handler = ext4_xattr_handler_map[name_index]; 132ac27a0ecSDave Kleikamp return handler; 133ac27a0ecSDave Kleikamp } 134ac27a0ecSDave Kleikamp 135ac27a0ecSDave Kleikamp /* 136ac27a0ecSDave Kleikamp * Inode operation listxattr() 137ac27a0ecSDave Kleikamp * 138ac27a0ecSDave Kleikamp * dentry->d_inode->i_mutex: don't care 139ac27a0ecSDave Kleikamp */ 140ac27a0ecSDave Kleikamp ssize_t 141617ba13bSMingming Cao ext4_listxattr(struct dentry *dentry, char *buffer, size_t size) 142ac27a0ecSDave Kleikamp { 143617ba13bSMingming Cao return ext4_xattr_list(dentry->d_inode, buffer, size); 144ac27a0ecSDave Kleikamp } 145ac27a0ecSDave Kleikamp 146ac27a0ecSDave Kleikamp static int 147617ba13bSMingming Cao ext4_xattr_check_names(struct ext4_xattr_entry *entry, void *end) 148ac27a0ecSDave Kleikamp { 149ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry)) { 150617ba13bSMingming Cao struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(entry); 151ac27a0ecSDave Kleikamp if ((void *)next >= end) 152ac27a0ecSDave Kleikamp return -EIO; 153ac27a0ecSDave Kleikamp entry = next; 154ac27a0ecSDave Kleikamp } 155ac27a0ecSDave Kleikamp return 0; 156ac27a0ecSDave Kleikamp } 157ac27a0ecSDave Kleikamp 158ac27a0ecSDave Kleikamp static inline int 159617ba13bSMingming Cao ext4_xattr_check_block(struct buffer_head *bh) 160ac27a0ecSDave Kleikamp { 161ac27a0ecSDave Kleikamp int error; 162ac27a0ecSDave Kleikamp 163617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 164ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) 165ac27a0ecSDave Kleikamp return -EIO; 166617ba13bSMingming Cao error = ext4_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size); 167ac27a0ecSDave Kleikamp return error; 168ac27a0ecSDave Kleikamp } 169ac27a0ecSDave Kleikamp 170ac27a0ecSDave Kleikamp static inline int 171617ba13bSMingming Cao ext4_xattr_check_entry(struct ext4_xattr_entry *entry, size_t size) 172ac27a0ecSDave Kleikamp { 173ac27a0ecSDave Kleikamp size_t value_size = le32_to_cpu(entry->e_value_size); 174ac27a0ecSDave Kleikamp 175ac27a0ecSDave Kleikamp if (entry->e_value_block != 0 || value_size > size || 176ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs) + value_size > size) 177ac27a0ecSDave Kleikamp return -EIO; 178ac27a0ecSDave Kleikamp return 0; 179ac27a0ecSDave Kleikamp } 180ac27a0ecSDave Kleikamp 181ac27a0ecSDave Kleikamp static int 182617ba13bSMingming Cao ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, 183ac27a0ecSDave Kleikamp const char *name, size_t size, int sorted) 184ac27a0ecSDave Kleikamp { 185617ba13bSMingming Cao struct ext4_xattr_entry *entry; 186ac27a0ecSDave Kleikamp size_t name_len; 187ac27a0ecSDave Kleikamp int cmp = 1; 188ac27a0ecSDave Kleikamp 189ac27a0ecSDave Kleikamp if (name == NULL) 190ac27a0ecSDave Kleikamp return -EINVAL; 191ac27a0ecSDave Kleikamp name_len = strlen(name); 192ac27a0ecSDave Kleikamp entry = *pentry; 193617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 194ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 195ac27a0ecSDave Kleikamp if (!cmp) 196ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 197ac27a0ecSDave Kleikamp if (!cmp) 198ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 199ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 200ac27a0ecSDave Kleikamp break; 201ac27a0ecSDave Kleikamp } 202ac27a0ecSDave Kleikamp *pentry = entry; 203617ba13bSMingming Cao if (!cmp && ext4_xattr_check_entry(entry, size)) 204ac27a0ecSDave Kleikamp return -EIO; 205ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 206ac27a0ecSDave Kleikamp } 207ac27a0ecSDave Kleikamp 208ac27a0ecSDave Kleikamp static int 209617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 210ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 211ac27a0ecSDave Kleikamp { 212ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 213617ba13bSMingming Cao struct ext4_xattr_entry *entry; 214ac27a0ecSDave Kleikamp size_t size; 215ac27a0ecSDave Kleikamp int error; 216ac27a0ecSDave Kleikamp 217ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 218ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 219ac27a0ecSDave Kleikamp 220ac27a0ecSDave Kleikamp error = -ENODATA; 221617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 222ac27a0ecSDave Kleikamp goto cleanup; 223617ba13bSMingming Cao ea_idebug(inode, "reading block %u", EXT4_I(inode)->i_file_acl); 224617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 225ac27a0ecSDave Kleikamp if (!bh) 226ac27a0ecSDave Kleikamp goto cleanup; 227ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 228ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 229617ba13bSMingming Cao if (ext4_xattr_check_block(bh)) { 23046e665e9SHarvey Harrison bad_block: ext4_error(inode->i_sb, __func__, 2312ae02107SMingming Cao "inode %lu: bad block %llu", inode->i_ino, 232617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 233ac27a0ecSDave Kleikamp error = -EIO; 234ac27a0ecSDave Kleikamp goto cleanup; 235ac27a0ecSDave Kleikamp } 236617ba13bSMingming Cao ext4_xattr_cache_insert(bh); 237ac27a0ecSDave Kleikamp entry = BFIRST(bh); 238617ba13bSMingming Cao error = ext4_xattr_find_entry(&entry, name_index, name, bh->b_size, 1); 239ac27a0ecSDave Kleikamp if (error == -EIO) 240ac27a0ecSDave Kleikamp goto bad_block; 241ac27a0ecSDave Kleikamp if (error) 242ac27a0ecSDave Kleikamp goto cleanup; 243ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 244ac27a0ecSDave Kleikamp if (buffer) { 245ac27a0ecSDave Kleikamp error = -ERANGE; 246ac27a0ecSDave Kleikamp if (size > buffer_size) 247ac27a0ecSDave Kleikamp goto cleanup; 248ac27a0ecSDave Kleikamp memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs), 249ac27a0ecSDave Kleikamp size); 250ac27a0ecSDave Kleikamp } 251ac27a0ecSDave Kleikamp error = size; 252ac27a0ecSDave Kleikamp 253ac27a0ecSDave Kleikamp cleanup: 254ac27a0ecSDave Kleikamp brelse(bh); 255ac27a0ecSDave Kleikamp return error; 256ac27a0ecSDave Kleikamp } 257ac27a0ecSDave Kleikamp 258ac27a0ecSDave Kleikamp static int 259617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 260ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 261ac27a0ecSDave Kleikamp { 262617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 263617ba13bSMingming Cao struct ext4_xattr_entry *entry; 264617ba13bSMingming Cao struct ext4_inode *raw_inode; 265617ba13bSMingming Cao struct ext4_iloc iloc; 266ac27a0ecSDave Kleikamp size_t size; 267ac27a0ecSDave Kleikamp void *end; 268ac27a0ecSDave Kleikamp int error; 269ac27a0ecSDave Kleikamp 270617ba13bSMingming Cao if (!(EXT4_I(inode)->i_state & EXT4_STATE_XATTR)) 271ac27a0ecSDave Kleikamp return -ENODATA; 272617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 273ac27a0ecSDave Kleikamp if (error) 274ac27a0ecSDave Kleikamp return error; 275617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 276ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 277ac27a0ecSDave Kleikamp entry = IFIRST(header); 278617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 279617ba13bSMingming Cao error = ext4_xattr_check_names(entry, end); 280ac27a0ecSDave Kleikamp if (error) 281ac27a0ecSDave Kleikamp goto cleanup; 282617ba13bSMingming Cao error = ext4_xattr_find_entry(&entry, name_index, name, 283ac27a0ecSDave Kleikamp end - (void *)entry, 0); 284ac27a0ecSDave Kleikamp if (error) 285ac27a0ecSDave Kleikamp goto cleanup; 286ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 287ac27a0ecSDave Kleikamp if (buffer) { 288ac27a0ecSDave Kleikamp error = -ERANGE; 289ac27a0ecSDave Kleikamp if (size > buffer_size) 290ac27a0ecSDave Kleikamp goto cleanup; 291ac27a0ecSDave Kleikamp memcpy(buffer, (void *)IFIRST(header) + 292ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs), size); 293ac27a0ecSDave Kleikamp } 294ac27a0ecSDave Kleikamp error = size; 295ac27a0ecSDave Kleikamp 296ac27a0ecSDave Kleikamp cleanup: 297ac27a0ecSDave Kleikamp brelse(iloc.bh); 298ac27a0ecSDave Kleikamp return error; 299ac27a0ecSDave Kleikamp } 300ac27a0ecSDave Kleikamp 301ac27a0ecSDave Kleikamp /* 302617ba13bSMingming Cao * ext4_xattr_get() 303ac27a0ecSDave Kleikamp * 304ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 305ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 306ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 307ac27a0ecSDave Kleikamp * 308ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 309ac27a0ecSDave Kleikamp * used / required on success. 310ac27a0ecSDave Kleikamp */ 311ac27a0ecSDave Kleikamp int 312617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 313ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 314ac27a0ecSDave Kleikamp { 315ac27a0ecSDave Kleikamp int error; 316ac27a0ecSDave Kleikamp 317617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 318617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 319ac27a0ecSDave Kleikamp buffer_size); 320ac27a0ecSDave Kleikamp if (error == -ENODATA) 321617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 322ac27a0ecSDave Kleikamp buffer_size); 323617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 324ac27a0ecSDave Kleikamp return error; 325ac27a0ecSDave Kleikamp } 326ac27a0ecSDave Kleikamp 327ac27a0ecSDave Kleikamp static int 328617ba13bSMingming Cao ext4_xattr_list_entries(struct inode *inode, struct ext4_xattr_entry *entry, 329ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 330ac27a0ecSDave Kleikamp { 331ac27a0ecSDave Kleikamp size_t rest = buffer_size; 332ac27a0ecSDave Kleikamp 333617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 334ac27a0ecSDave Kleikamp struct xattr_handler *handler = 335617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 336ac27a0ecSDave Kleikamp 337ac27a0ecSDave Kleikamp if (handler) { 338ac27a0ecSDave Kleikamp size_t size = handler->list(inode, buffer, rest, 339ac27a0ecSDave Kleikamp entry->e_name, 340ac27a0ecSDave Kleikamp entry->e_name_len); 341ac27a0ecSDave Kleikamp if (buffer) { 342ac27a0ecSDave Kleikamp if (size > rest) 343ac27a0ecSDave Kleikamp return -ERANGE; 344ac27a0ecSDave Kleikamp buffer += size; 345ac27a0ecSDave Kleikamp } 346ac27a0ecSDave Kleikamp rest -= size; 347ac27a0ecSDave Kleikamp } 348ac27a0ecSDave Kleikamp } 349ac27a0ecSDave Kleikamp return buffer_size - rest; 350ac27a0ecSDave Kleikamp } 351ac27a0ecSDave Kleikamp 352ac27a0ecSDave Kleikamp static int 353617ba13bSMingming Cao ext4_xattr_block_list(struct inode *inode, char *buffer, size_t buffer_size) 354ac27a0ecSDave Kleikamp { 355ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 356ac27a0ecSDave Kleikamp int error; 357ac27a0ecSDave Kleikamp 358ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 359ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 360ac27a0ecSDave Kleikamp 361ac27a0ecSDave Kleikamp error = 0; 362617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 363ac27a0ecSDave Kleikamp goto cleanup; 364617ba13bSMingming Cao ea_idebug(inode, "reading block %u", EXT4_I(inode)->i_file_acl); 365617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 366ac27a0ecSDave Kleikamp error = -EIO; 367ac27a0ecSDave Kleikamp if (!bh) 368ac27a0ecSDave Kleikamp goto cleanup; 369ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 370ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 371617ba13bSMingming Cao if (ext4_xattr_check_block(bh)) { 37246e665e9SHarvey Harrison ext4_error(inode->i_sb, __func__, 3732ae02107SMingming Cao "inode %lu: bad block %llu", inode->i_ino, 374617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 375ac27a0ecSDave Kleikamp error = -EIO; 376ac27a0ecSDave Kleikamp goto cleanup; 377ac27a0ecSDave Kleikamp } 378617ba13bSMingming Cao ext4_xattr_cache_insert(bh); 379617ba13bSMingming Cao error = ext4_xattr_list_entries(inode, BFIRST(bh), buffer, buffer_size); 380ac27a0ecSDave Kleikamp 381ac27a0ecSDave Kleikamp cleanup: 382ac27a0ecSDave Kleikamp brelse(bh); 383ac27a0ecSDave Kleikamp 384ac27a0ecSDave Kleikamp return error; 385ac27a0ecSDave Kleikamp } 386ac27a0ecSDave Kleikamp 387ac27a0ecSDave Kleikamp static int 388617ba13bSMingming Cao ext4_xattr_ibody_list(struct inode *inode, char *buffer, size_t buffer_size) 389ac27a0ecSDave Kleikamp { 390617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 391617ba13bSMingming Cao struct ext4_inode *raw_inode; 392617ba13bSMingming Cao struct ext4_iloc iloc; 393ac27a0ecSDave Kleikamp void *end; 394ac27a0ecSDave Kleikamp int error; 395ac27a0ecSDave Kleikamp 396617ba13bSMingming Cao if (!(EXT4_I(inode)->i_state & EXT4_STATE_XATTR)) 397ac27a0ecSDave Kleikamp return 0; 398617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 399ac27a0ecSDave Kleikamp if (error) 400ac27a0ecSDave Kleikamp return error; 401617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 402ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 403617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 404617ba13bSMingming Cao error = ext4_xattr_check_names(IFIRST(header), end); 405ac27a0ecSDave Kleikamp if (error) 406ac27a0ecSDave Kleikamp goto cleanup; 407617ba13bSMingming Cao error = ext4_xattr_list_entries(inode, IFIRST(header), 408ac27a0ecSDave Kleikamp buffer, buffer_size); 409ac27a0ecSDave Kleikamp 410ac27a0ecSDave Kleikamp cleanup: 411ac27a0ecSDave Kleikamp brelse(iloc.bh); 412ac27a0ecSDave Kleikamp return error; 413ac27a0ecSDave Kleikamp } 414ac27a0ecSDave Kleikamp 415ac27a0ecSDave Kleikamp /* 416617ba13bSMingming Cao * ext4_xattr_list() 417ac27a0ecSDave Kleikamp * 418ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 419ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 420ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 421ac27a0ecSDave Kleikamp * 422ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 423ac27a0ecSDave Kleikamp * used / required on success. 424ac27a0ecSDave Kleikamp */ 425d3a95d47SMingming Cao static int 426617ba13bSMingming Cao ext4_xattr_list(struct inode *inode, char *buffer, size_t buffer_size) 427ac27a0ecSDave Kleikamp { 428ac27a0ecSDave Kleikamp int i_error, b_error; 429ac27a0ecSDave Kleikamp 430617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 431617ba13bSMingming Cao i_error = ext4_xattr_ibody_list(inode, buffer, buffer_size); 432ac27a0ecSDave Kleikamp if (i_error < 0) { 433ac27a0ecSDave Kleikamp b_error = 0; 434ac27a0ecSDave Kleikamp } else { 435ac27a0ecSDave Kleikamp if (buffer) { 436ac27a0ecSDave Kleikamp buffer += i_error; 437ac27a0ecSDave Kleikamp buffer_size -= i_error; 438ac27a0ecSDave Kleikamp } 439617ba13bSMingming Cao b_error = ext4_xattr_block_list(inode, buffer, buffer_size); 440ac27a0ecSDave Kleikamp if (b_error < 0) 441ac27a0ecSDave Kleikamp i_error = 0; 442ac27a0ecSDave Kleikamp } 443617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 444ac27a0ecSDave Kleikamp return i_error + b_error; 445ac27a0ecSDave Kleikamp } 446ac27a0ecSDave Kleikamp 447ac27a0ecSDave Kleikamp /* 448617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 449ac27a0ecSDave Kleikamp * not set, set it. 450ac27a0ecSDave Kleikamp */ 451617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 452ac27a0ecSDave Kleikamp struct super_block *sb) 453ac27a0ecSDave Kleikamp { 454617ba13bSMingming Cao if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_EXT_ATTR)) 455ac27a0ecSDave Kleikamp return; 456ac27a0ecSDave Kleikamp 457617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 458ed2908f3SAndreas Gruenbacher EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_EXT_ATTR); 459ac27a0ecSDave Kleikamp sb->s_dirt = 1; 460617ba13bSMingming Cao ext4_journal_dirty_metadata(handle, EXT4_SB(sb)->s_sbh); 461ac27a0ecSDave Kleikamp } 462ac27a0ecSDave Kleikamp } 463ac27a0ecSDave Kleikamp 464ac27a0ecSDave Kleikamp /* 465ac27a0ecSDave Kleikamp * Release the xattr block BH: If the reference count is > 1, decrement 466ac27a0ecSDave Kleikamp * it; otherwise free the block. 467ac27a0ecSDave Kleikamp */ 468ac27a0ecSDave Kleikamp static void 469617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 470ac27a0ecSDave Kleikamp struct buffer_head *bh) 471ac27a0ecSDave Kleikamp { 472ac27a0ecSDave Kleikamp struct mb_cache_entry *ce = NULL; 4738a2bfdcbSMingming Cao int error = 0; 474ac27a0ecSDave Kleikamp 475617ba13bSMingming Cao ce = mb_cache_entry_get(ext4_xattr_cache, bh->b_bdev, bh->b_blocknr); 4768a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 4778a2bfdcbSMingming Cao if (error) 4788a2bfdcbSMingming Cao goto out; 4798a2bfdcbSMingming Cao 4808a2bfdcbSMingming Cao lock_buffer(bh); 481ac27a0ecSDave Kleikamp if (BHDR(bh)->h_refcount == cpu_to_le32(1)) { 482ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 483ac27a0ecSDave Kleikamp if (ce) 484ac27a0ecSDave Kleikamp mb_cache_entry_free(ce); 485c9de560dSAlex Tomas ext4_free_blocks(handle, inode, bh->b_blocknr, 1, 1); 486ac27a0ecSDave Kleikamp get_bh(bh); 487617ba13bSMingming Cao ext4_forget(handle, 1, inode, bh, bh->b_blocknr); 488ac27a0ecSDave Kleikamp } else { 489e8546d06SMarcin Slusarz le32_add_cpu(&BHDR(bh)->h_refcount, -1); 4908a2bfdcbSMingming Cao error = ext4_journal_dirty_metadata(handle, bh); 491ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 492ac27a0ecSDave Kleikamp handle->h_sync = 1; 493ac27a0ecSDave Kleikamp DQUOT_FREE_BLOCK(inode, 1); 494ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 495ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 496ac27a0ecSDave Kleikamp if (ce) 497ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 498ac27a0ecSDave Kleikamp } 4998a2bfdcbSMingming Cao unlock_buffer(bh); 5008a2bfdcbSMingming Cao out: 5018a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 5028a2bfdcbSMingming Cao return; 503ac27a0ecSDave Kleikamp } 504ac27a0ecSDave Kleikamp 5056dd4ee7cSKalpak Shah /* 5066dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 5076dd4ee7cSKalpak Shah * bytes used by EA entries. 5086dd4ee7cSKalpak Shah */ 5096dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 5106dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 5116dd4ee7cSKalpak Shah { 5126dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 5136dd4ee7cSKalpak Shah *total += EXT4_XATTR_LEN(last->e_name_len); 5146dd4ee7cSKalpak Shah if (!last->e_value_block && last->e_value_size) { 5156dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 5166dd4ee7cSKalpak Shah if (offs < *min_offs) 5176dd4ee7cSKalpak Shah *min_offs = offs; 5186dd4ee7cSKalpak Shah } 5196dd4ee7cSKalpak Shah } 5206dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 5216dd4ee7cSKalpak Shah } 5226dd4ee7cSKalpak Shah 523617ba13bSMingming Cao struct ext4_xattr_info { 524ac27a0ecSDave Kleikamp int name_index; 525ac27a0ecSDave Kleikamp const char *name; 526ac27a0ecSDave Kleikamp const void *value; 527ac27a0ecSDave Kleikamp size_t value_len; 528ac27a0ecSDave Kleikamp }; 529ac27a0ecSDave Kleikamp 530617ba13bSMingming Cao struct ext4_xattr_search { 531617ba13bSMingming Cao struct ext4_xattr_entry *first; 532ac27a0ecSDave Kleikamp void *base; 533ac27a0ecSDave Kleikamp void *end; 534617ba13bSMingming Cao struct ext4_xattr_entry *here; 535ac27a0ecSDave Kleikamp int not_found; 536ac27a0ecSDave Kleikamp }; 537ac27a0ecSDave Kleikamp 538ac27a0ecSDave Kleikamp static int 539617ba13bSMingming Cao ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s) 540ac27a0ecSDave Kleikamp { 541617ba13bSMingming Cao struct ext4_xattr_entry *last; 542ac27a0ecSDave Kleikamp size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); 543ac27a0ecSDave Kleikamp 544ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 545ac27a0ecSDave Kleikamp last = s->first; 546617ba13bSMingming Cao for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 547ac27a0ecSDave Kleikamp if (!last->e_value_block && last->e_value_size) { 548ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 549ac27a0ecSDave Kleikamp if (offs < min_offs) 550ac27a0ecSDave Kleikamp min_offs = offs; 551ac27a0ecSDave Kleikamp } 552ac27a0ecSDave Kleikamp } 553ac27a0ecSDave Kleikamp free = min_offs - ((void *)last - s->base) - sizeof(__u32); 554ac27a0ecSDave Kleikamp if (!s->not_found) { 555ac27a0ecSDave Kleikamp if (!s->here->e_value_block && s->here->e_value_size) { 556ac27a0ecSDave Kleikamp size_t size = le32_to_cpu(s->here->e_value_size); 557617ba13bSMingming Cao free += EXT4_XATTR_SIZE(size); 558ac27a0ecSDave Kleikamp } 559617ba13bSMingming Cao free += EXT4_XATTR_LEN(name_len); 560ac27a0ecSDave Kleikamp } 561ac27a0ecSDave Kleikamp if (i->value) { 562617ba13bSMingming Cao if (free < EXT4_XATTR_SIZE(i->value_len) || 563617ba13bSMingming Cao free < EXT4_XATTR_LEN(name_len) + 564617ba13bSMingming Cao EXT4_XATTR_SIZE(i->value_len)) 565ac27a0ecSDave Kleikamp return -ENOSPC; 566ac27a0ecSDave Kleikamp } 567ac27a0ecSDave Kleikamp 568ac27a0ecSDave Kleikamp if (i->value && s->not_found) { 569ac27a0ecSDave Kleikamp /* Insert the new name. */ 570617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 571ac27a0ecSDave Kleikamp size_t rest = (void *)last - (void *)s->here + sizeof(__u32); 572ac27a0ecSDave Kleikamp memmove((void *)s->here + size, s->here, rest); 573ac27a0ecSDave Kleikamp memset(s->here, 0, size); 574ac27a0ecSDave Kleikamp s->here->e_name_index = i->name_index; 575ac27a0ecSDave Kleikamp s->here->e_name_len = name_len; 576ac27a0ecSDave Kleikamp memcpy(s->here->e_name, i->name, name_len); 577ac27a0ecSDave Kleikamp } else { 578ac27a0ecSDave Kleikamp if (!s->here->e_value_block && s->here->e_value_size) { 579ac27a0ecSDave Kleikamp void *first_val = s->base + min_offs; 580ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(s->here->e_value_offs); 581ac27a0ecSDave Kleikamp void *val = s->base + offs; 582617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE( 583ac27a0ecSDave Kleikamp le32_to_cpu(s->here->e_value_size)); 584ac27a0ecSDave Kleikamp 585617ba13bSMingming Cao if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { 586ac27a0ecSDave Kleikamp /* The old and the new value have the same 587ac27a0ecSDave Kleikamp size. Just replace. */ 588ac27a0ecSDave Kleikamp s->here->e_value_size = 589ac27a0ecSDave Kleikamp cpu_to_le32(i->value_len); 590617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 591617ba13bSMingming Cao EXT4_XATTR_PAD); /* Clear pad bytes. */ 592ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 593ac27a0ecSDave Kleikamp return 0; 594ac27a0ecSDave Kleikamp } 595ac27a0ecSDave Kleikamp 596ac27a0ecSDave Kleikamp /* Remove the old value. */ 597ac27a0ecSDave Kleikamp memmove(first_val + size, first_val, val - first_val); 598ac27a0ecSDave Kleikamp memset(first_val, 0, size); 599ac27a0ecSDave Kleikamp s->here->e_value_size = 0; 600ac27a0ecSDave Kleikamp s->here->e_value_offs = 0; 601ac27a0ecSDave Kleikamp min_offs += size; 602ac27a0ecSDave Kleikamp 603ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 604ac27a0ecSDave Kleikamp last = s->first; 605ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 606ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 607ac27a0ecSDave Kleikamp if (!last->e_value_block && 608ac27a0ecSDave Kleikamp last->e_value_size && o < offs) 609ac27a0ecSDave Kleikamp last->e_value_offs = 610ac27a0ecSDave Kleikamp cpu_to_le16(o + size); 611617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 612ac27a0ecSDave Kleikamp } 613ac27a0ecSDave Kleikamp } 614ac27a0ecSDave Kleikamp if (!i->value) { 615ac27a0ecSDave Kleikamp /* Remove the old name. */ 616617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 617ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 618ac27a0ecSDave Kleikamp memmove(s->here, (void *)s->here + size, 619ac27a0ecSDave Kleikamp (void *)last - (void *)s->here + sizeof(__u32)); 620ac27a0ecSDave Kleikamp memset(last, 0, size); 621ac27a0ecSDave Kleikamp } 622ac27a0ecSDave Kleikamp } 623ac27a0ecSDave Kleikamp 624ac27a0ecSDave Kleikamp if (i->value) { 625ac27a0ecSDave Kleikamp /* Insert the new value. */ 626ac27a0ecSDave Kleikamp s->here->e_value_size = cpu_to_le32(i->value_len); 627ac27a0ecSDave Kleikamp if (i->value_len) { 628617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE(i->value_len); 629ac27a0ecSDave Kleikamp void *val = s->base + min_offs - size; 630ac27a0ecSDave Kleikamp s->here->e_value_offs = cpu_to_le16(min_offs - size); 631617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 632617ba13bSMingming Cao EXT4_XATTR_PAD); /* Clear the pad bytes. */ 633ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 634ac27a0ecSDave Kleikamp } 635ac27a0ecSDave Kleikamp } 636ac27a0ecSDave Kleikamp return 0; 637ac27a0ecSDave Kleikamp } 638ac27a0ecSDave Kleikamp 639617ba13bSMingming Cao struct ext4_xattr_block_find { 640617ba13bSMingming Cao struct ext4_xattr_search s; 641ac27a0ecSDave Kleikamp struct buffer_head *bh; 642ac27a0ecSDave Kleikamp }; 643ac27a0ecSDave Kleikamp 644ac27a0ecSDave Kleikamp static int 645617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 646617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 647ac27a0ecSDave Kleikamp { 648ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 649ac27a0ecSDave Kleikamp int error; 650ac27a0ecSDave Kleikamp 651ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 652ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 653ac27a0ecSDave Kleikamp 654617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 655ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 656617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 657ac27a0ecSDave Kleikamp error = -EIO; 658ac27a0ecSDave Kleikamp if (!bs->bh) 659ac27a0ecSDave Kleikamp goto cleanup; 660ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 661ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 662ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 663617ba13bSMingming Cao if (ext4_xattr_check_block(bs->bh)) { 66446e665e9SHarvey Harrison ext4_error(sb, __func__, 6652ae02107SMingming Cao "inode %lu: bad block %llu", inode->i_ino, 666617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 667ac27a0ecSDave Kleikamp error = -EIO; 668ac27a0ecSDave Kleikamp goto cleanup; 669ac27a0ecSDave Kleikamp } 670ac27a0ecSDave Kleikamp /* Find the named attribute. */ 671ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 672ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 673ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 674ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 675617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 676ac27a0ecSDave Kleikamp i->name, bs->bh->b_size, 1); 677ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 678ac27a0ecSDave Kleikamp goto cleanup; 679ac27a0ecSDave Kleikamp bs->s.not_found = error; 680ac27a0ecSDave Kleikamp } 681ac27a0ecSDave Kleikamp error = 0; 682ac27a0ecSDave Kleikamp 683ac27a0ecSDave Kleikamp cleanup: 684ac27a0ecSDave Kleikamp return error; 685ac27a0ecSDave Kleikamp } 686ac27a0ecSDave Kleikamp 687ac27a0ecSDave Kleikamp static int 688617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 689617ba13bSMingming Cao struct ext4_xattr_info *i, 690617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 691ac27a0ecSDave Kleikamp { 692ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 693ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 694617ba13bSMingming Cao struct ext4_xattr_search *s = &bs->s; 695ac27a0ecSDave Kleikamp struct mb_cache_entry *ce = NULL; 6968a2bfdcbSMingming Cao int error = 0; 697ac27a0ecSDave Kleikamp 698617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 699ac27a0ecSDave Kleikamp 700ac27a0ecSDave Kleikamp if (i->value && i->value_len > sb->s_blocksize) 701ac27a0ecSDave Kleikamp return -ENOSPC; 702ac27a0ecSDave Kleikamp if (s->base) { 703617ba13bSMingming Cao ce = mb_cache_entry_get(ext4_xattr_cache, bs->bh->b_bdev, 704ac27a0ecSDave Kleikamp bs->bh->b_blocknr); 7058a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 7068a2bfdcbSMingming Cao if (error) 7078a2bfdcbSMingming Cao goto cleanup; 7088a2bfdcbSMingming Cao lock_buffer(bs->bh); 7098a2bfdcbSMingming Cao 710ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 711ac27a0ecSDave Kleikamp if (ce) { 712ac27a0ecSDave Kleikamp mb_cache_entry_free(ce); 713ac27a0ecSDave Kleikamp ce = NULL; 714ac27a0ecSDave Kleikamp } 715ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 716617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 717ac27a0ecSDave Kleikamp if (!error) { 718ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 719617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), 720ac27a0ecSDave Kleikamp s->here); 721617ba13bSMingming Cao ext4_xattr_cache_insert(bs->bh); 722ac27a0ecSDave Kleikamp } 723ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 724ac27a0ecSDave Kleikamp if (error == -EIO) 725ac27a0ecSDave Kleikamp goto bad_block; 726ac27a0ecSDave Kleikamp if (!error) 727617ba13bSMingming Cao error = ext4_journal_dirty_metadata(handle, 728ac27a0ecSDave Kleikamp bs->bh); 729ac27a0ecSDave Kleikamp if (error) 730ac27a0ecSDave Kleikamp goto cleanup; 731ac27a0ecSDave Kleikamp goto inserted; 732ac27a0ecSDave Kleikamp } else { 733ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 734ac27a0ecSDave Kleikamp 7358a2bfdcbSMingming Cao unlock_buffer(bs->bh); 7368a2bfdcbSMingming Cao jbd2_journal_release_buffer(handle, bs->bh); 737ac27a0ecSDave Kleikamp if (ce) { 738ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 739ac27a0ecSDave Kleikamp ce = NULL; 740ac27a0ecSDave Kleikamp } 741ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 742216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 743ac27a0ecSDave Kleikamp error = -ENOMEM; 744ac27a0ecSDave Kleikamp if (s->base == NULL) 745ac27a0ecSDave Kleikamp goto cleanup; 746ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 747ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 748ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 749ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 750ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 751ac27a0ecSDave Kleikamp } 752ac27a0ecSDave Kleikamp } else { 753ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 754216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 755ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 756ac27a0ecSDave Kleikamp error = -ENOMEM; 757ac27a0ecSDave Kleikamp if (s->base == NULL) 758ac27a0ecSDave Kleikamp goto cleanup; 759617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 760ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 761ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 762ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 763ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 764ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 765ac27a0ecSDave Kleikamp } 766ac27a0ecSDave Kleikamp 767617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 768ac27a0ecSDave Kleikamp if (error == -EIO) 769ac27a0ecSDave Kleikamp goto bad_block; 770ac27a0ecSDave Kleikamp if (error) 771ac27a0ecSDave Kleikamp goto cleanup; 772ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 773617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), s->here); 774ac27a0ecSDave Kleikamp 775ac27a0ecSDave Kleikamp inserted: 776ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 777617ba13bSMingming Cao new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); 778ac27a0ecSDave Kleikamp if (new_bh) { 779ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 780ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 781ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 782ac27a0ecSDave Kleikamp else { 783ac27a0ecSDave Kleikamp /* The old block is released after updating 784ac27a0ecSDave Kleikamp the inode. */ 785ac27a0ecSDave Kleikamp error = -EDQUOT; 786ac27a0ecSDave Kleikamp if (DQUOT_ALLOC_BLOCK(inode, 1)) 787ac27a0ecSDave Kleikamp goto cleanup; 788617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 789ac27a0ecSDave Kleikamp new_bh); 790ac27a0ecSDave Kleikamp if (error) 791ac27a0ecSDave Kleikamp goto cleanup_dquot; 792ac27a0ecSDave Kleikamp lock_buffer(new_bh); 793e8546d06SMarcin Slusarz le32_add_cpu(&BHDR(new_bh)->h_refcount, 1); 794ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 795ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(new_bh)->h_refcount)); 796ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 797617ba13bSMingming Cao error = ext4_journal_dirty_metadata(handle, 798ac27a0ecSDave Kleikamp new_bh); 799ac27a0ecSDave Kleikamp if (error) 800ac27a0ecSDave Kleikamp goto cleanup_dquot; 801ac27a0ecSDave Kleikamp } 802ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 803ac27a0ecSDave Kleikamp ce = NULL; 804ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 805ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 806ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 807ac27a0ecSDave Kleikamp new_bh = bs->bh; 808ac27a0ecSDave Kleikamp get_bh(new_bh); 809ac27a0ecSDave Kleikamp } else { 810ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 811d00a6d7bSAkinobu Mita ext4_fsblk_t goal = ext4_group_first_block_no(sb, 812d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 813617ba13bSMingming Cao ext4_fsblk_t block = ext4_new_block(handle, inode, 814ac27a0ecSDave Kleikamp goal, &error); 815ac27a0ecSDave Kleikamp if (error) 816ac27a0ecSDave Kleikamp goto cleanup; 817ac27a0ecSDave Kleikamp ea_idebug(inode, "creating block %d", block); 818ac27a0ecSDave Kleikamp 819ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 820ac27a0ecSDave Kleikamp if (!new_bh) { 821ac27a0ecSDave Kleikamp getblk_failed: 822c9de560dSAlex Tomas ext4_free_blocks(handle, inode, block, 1, 1); 823ac27a0ecSDave Kleikamp error = -EIO; 824ac27a0ecSDave Kleikamp goto cleanup; 825ac27a0ecSDave Kleikamp } 826ac27a0ecSDave Kleikamp lock_buffer(new_bh); 827617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 828ac27a0ecSDave Kleikamp if (error) { 829ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 830ac27a0ecSDave Kleikamp goto getblk_failed; 831ac27a0ecSDave Kleikamp } 832ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 833ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 834ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 835617ba13bSMingming Cao ext4_xattr_cache_insert(new_bh); 836617ba13bSMingming Cao error = ext4_journal_dirty_metadata(handle, new_bh); 837ac27a0ecSDave Kleikamp if (error) 838ac27a0ecSDave Kleikamp goto cleanup; 839ac27a0ecSDave Kleikamp } 840ac27a0ecSDave Kleikamp } 841ac27a0ecSDave Kleikamp 842ac27a0ecSDave Kleikamp /* Update the inode. */ 843617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 844ac27a0ecSDave Kleikamp 845ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 846ac27a0ecSDave Kleikamp if (bs->bh && bs->bh != new_bh) 847617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bs->bh); 848ac27a0ecSDave Kleikamp error = 0; 849ac27a0ecSDave Kleikamp 850ac27a0ecSDave Kleikamp cleanup: 851ac27a0ecSDave Kleikamp if (ce) 852ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 853ac27a0ecSDave Kleikamp brelse(new_bh); 854ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 855ac27a0ecSDave Kleikamp kfree(s->base); 856ac27a0ecSDave Kleikamp 857ac27a0ecSDave Kleikamp return error; 858ac27a0ecSDave Kleikamp 859ac27a0ecSDave Kleikamp cleanup_dquot: 860ac27a0ecSDave Kleikamp DQUOT_FREE_BLOCK(inode, 1); 861ac27a0ecSDave Kleikamp goto cleanup; 862ac27a0ecSDave Kleikamp 863ac27a0ecSDave Kleikamp bad_block: 86446e665e9SHarvey Harrison ext4_error(inode->i_sb, __func__, 8652ae02107SMingming Cao "inode %lu: bad block %llu", inode->i_ino, 866617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 867ac27a0ecSDave Kleikamp goto cleanup; 868ac27a0ecSDave Kleikamp 869ac27a0ecSDave Kleikamp #undef header 870ac27a0ecSDave Kleikamp } 871ac27a0ecSDave Kleikamp 872617ba13bSMingming Cao struct ext4_xattr_ibody_find { 873617ba13bSMingming Cao struct ext4_xattr_search s; 874617ba13bSMingming Cao struct ext4_iloc iloc; 875ac27a0ecSDave Kleikamp }; 876ac27a0ecSDave Kleikamp 877ac27a0ecSDave Kleikamp static int 878617ba13bSMingming Cao ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 879617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 880ac27a0ecSDave Kleikamp { 881617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 882617ba13bSMingming Cao struct ext4_inode *raw_inode; 883ac27a0ecSDave Kleikamp int error; 884ac27a0ecSDave Kleikamp 885617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 886ac27a0ecSDave Kleikamp return 0; 887617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 888ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 889ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 890ac27a0ecSDave Kleikamp is->s.here = is->s.first; 891617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 892617ba13bSMingming Cao if (EXT4_I(inode)->i_state & EXT4_STATE_XATTR) { 893617ba13bSMingming Cao error = ext4_xattr_check_names(IFIRST(header), is->s.end); 894ac27a0ecSDave Kleikamp if (error) 895ac27a0ecSDave Kleikamp return error; 896ac27a0ecSDave Kleikamp /* Find the named attribute. */ 897617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 898ac27a0ecSDave Kleikamp i->name, is->s.end - 899ac27a0ecSDave Kleikamp (void *)is->s.base, 0); 900ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 901ac27a0ecSDave Kleikamp return error; 902ac27a0ecSDave Kleikamp is->s.not_found = error; 903ac27a0ecSDave Kleikamp } 904ac27a0ecSDave Kleikamp return 0; 905ac27a0ecSDave Kleikamp } 906ac27a0ecSDave Kleikamp 907ac27a0ecSDave Kleikamp static int 908617ba13bSMingming Cao ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 909617ba13bSMingming Cao struct ext4_xattr_info *i, 910617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 911ac27a0ecSDave Kleikamp { 912617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 913617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 914ac27a0ecSDave Kleikamp int error; 915ac27a0ecSDave Kleikamp 916617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 917ac27a0ecSDave Kleikamp return -ENOSPC; 918617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 919ac27a0ecSDave Kleikamp if (error) 920ac27a0ecSDave Kleikamp return error; 921617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 922ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 923617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 924617ba13bSMingming Cao EXT4_I(inode)->i_state |= EXT4_STATE_XATTR; 925ac27a0ecSDave Kleikamp } else { 926ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 927617ba13bSMingming Cao EXT4_I(inode)->i_state &= ~EXT4_STATE_XATTR; 928ac27a0ecSDave Kleikamp } 929ac27a0ecSDave Kleikamp return 0; 930ac27a0ecSDave Kleikamp } 931ac27a0ecSDave Kleikamp 932ac27a0ecSDave Kleikamp /* 933617ba13bSMingming Cao * ext4_xattr_set_handle() 934ac27a0ecSDave Kleikamp * 935ac27a0ecSDave Kleikamp * Create, replace or remove an extended attribute for this inode. Buffer 936ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 937ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 938ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 939ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 940ac27a0ecSDave Kleikamp * previous to the call, respectively. 941ac27a0ecSDave Kleikamp * 942ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 943ac27a0ecSDave Kleikamp */ 944ac27a0ecSDave Kleikamp int 945617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 946ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 947ac27a0ecSDave Kleikamp int flags) 948ac27a0ecSDave Kleikamp { 949617ba13bSMingming Cao struct ext4_xattr_info i = { 950ac27a0ecSDave Kleikamp .name_index = name_index, 951ac27a0ecSDave Kleikamp .name = name, 952ac27a0ecSDave Kleikamp .value = value, 953ac27a0ecSDave Kleikamp .value_len = value_len, 954ac27a0ecSDave Kleikamp 955ac27a0ecSDave Kleikamp }; 956617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 957ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 958ac27a0ecSDave Kleikamp }; 959617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 960ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 961ac27a0ecSDave Kleikamp }; 962ac27a0ecSDave Kleikamp int error; 963ac27a0ecSDave Kleikamp 964ac27a0ecSDave Kleikamp if (!name) 965ac27a0ecSDave Kleikamp return -EINVAL; 966ac27a0ecSDave Kleikamp if (strlen(name) > 255) 967ac27a0ecSDave Kleikamp return -ERANGE; 968617ba13bSMingming Cao down_write(&EXT4_I(inode)->xattr_sem); 969617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &is.iloc); 970ac27a0ecSDave Kleikamp if (error) 971ac27a0ecSDave Kleikamp goto cleanup; 972ac27a0ecSDave Kleikamp 973617ba13bSMingming Cao if (EXT4_I(inode)->i_state & EXT4_STATE_NEW) { 974617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 975617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 976617ba13bSMingming Cao EXT4_I(inode)->i_state &= ~EXT4_STATE_NEW; 977ac27a0ecSDave Kleikamp } 978ac27a0ecSDave Kleikamp 979617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 980ac27a0ecSDave Kleikamp if (error) 981ac27a0ecSDave Kleikamp goto cleanup; 982ac27a0ecSDave Kleikamp if (is.s.not_found) 983617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 984ac27a0ecSDave Kleikamp if (error) 985ac27a0ecSDave Kleikamp goto cleanup; 986ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 987ac27a0ecSDave Kleikamp error = -ENODATA; 988ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 989ac27a0ecSDave Kleikamp goto cleanup; 990ac27a0ecSDave Kleikamp error = 0; 991ac27a0ecSDave Kleikamp if (!value) 992ac27a0ecSDave Kleikamp goto cleanup; 993ac27a0ecSDave Kleikamp } else { 994ac27a0ecSDave Kleikamp error = -EEXIST; 995ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 996ac27a0ecSDave Kleikamp goto cleanup; 997ac27a0ecSDave Kleikamp } 998617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, is.iloc.bh); 999ac27a0ecSDave Kleikamp if (error) 1000ac27a0ecSDave Kleikamp goto cleanup; 1001ac27a0ecSDave Kleikamp if (!value) { 1002ac27a0ecSDave Kleikamp if (!is.s.not_found) 1003617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1004ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 1005617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1006ac27a0ecSDave Kleikamp } else { 1007617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1008ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 1009ac27a0ecSDave Kleikamp i.value = NULL; 1010617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1011ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 1012*7e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 1013*7e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 1014*7e01c8e5STiger Yang if (error) 1015*7e01c8e5STiger Yang goto cleanup; 1016*7e01c8e5STiger Yang } 1017617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1018ac27a0ecSDave Kleikamp if (error) 1019ac27a0ecSDave Kleikamp goto cleanup; 1020ac27a0ecSDave Kleikamp if (!is.s.not_found) { 1021ac27a0ecSDave Kleikamp i.value = NULL; 1022617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, 1023ac27a0ecSDave Kleikamp &is); 1024ac27a0ecSDave Kleikamp } 1025ac27a0ecSDave Kleikamp } 1026ac27a0ecSDave Kleikamp } 1027ac27a0ecSDave Kleikamp if (!error) { 1028617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 1029ef7f3835SKalpak Shah inode->i_ctime = ext4_current_time(inode); 10306dd4ee7cSKalpak Shah if (!value) 10316dd4ee7cSKalpak Shah EXT4_I(inode)->i_state &= ~EXT4_STATE_NO_EXPAND; 1032617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 1033ac27a0ecSDave Kleikamp /* 1034617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 1035ac27a0ecSDave Kleikamp * error != 0. 1036ac27a0ecSDave Kleikamp */ 1037ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 1038ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 1039ac27a0ecSDave Kleikamp handle->h_sync = 1; 1040ac27a0ecSDave Kleikamp } 1041ac27a0ecSDave Kleikamp 1042ac27a0ecSDave Kleikamp cleanup: 1043ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 1044ac27a0ecSDave Kleikamp brelse(bs.bh); 1045617ba13bSMingming Cao up_write(&EXT4_I(inode)->xattr_sem); 1046ac27a0ecSDave Kleikamp return error; 1047ac27a0ecSDave Kleikamp } 1048ac27a0ecSDave Kleikamp 1049ac27a0ecSDave Kleikamp /* 1050617ba13bSMingming Cao * ext4_xattr_set() 1051ac27a0ecSDave Kleikamp * 1052617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 1053ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 1054ac27a0ecSDave Kleikamp * 1055ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1056ac27a0ecSDave Kleikamp */ 1057ac27a0ecSDave Kleikamp int 1058617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 1059ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 1060ac27a0ecSDave Kleikamp { 1061ac27a0ecSDave Kleikamp handle_t *handle; 1062ac27a0ecSDave Kleikamp int error, retries = 0; 1063ac27a0ecSDave Kleikamp 1064ac27a0ecSDave Kleikamp retry: 1065617ba13bSMingming Cao handle = ext4_journal_start(inode, EXT4_DATA_TRANS_BLOCKS(inode->i_sb)); 1066ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 1067ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 1068ac27a0ecSDave Kleikamp } else { 1069ac27a0ecSDave Kleikamp int error2; 1070ac27a0ecSDave Kleikamp 1071617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 1072ac27a0ecSDave Kleikamp value, value_len, flags); 1073617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 1074ac27a0ecSDave Kleikamp if (error == -ENOSPC && 1075617ba13bSMingming Cao ext4_should_retry_alloc(inode->i_sb, &retries)) 1076ac27a0ecSDave Kleikamp goto retry; 1077ac27a0ecSDave Kleikamp if (error == 0) 1078ac27a0ecSDave Kleikamp error = error2; 1079ac27a0ecSDave Kleikamp } 1080ac27a0ecSDave Kleikamp 1081ac27a0ecSDave Kleikamp return error; 1082ac27a0ecSDave Kleikamp } 1083ac27a0ecSDave Kleikamp 1084ac27a0ecSDave Kleikamp /* 10856dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 10866dd4ee7cSKalpak Shah * i_extra_isize. 10876dd4ee7cSKalpak Shah */ 10886dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 10896dd4ee7cSKalpak Shah int value_offs_shift, void *to, 10906dd4ee7cSKalpak Shah void *from, size_t n, int blocksize) 10916dd4ee7cSKalpak Shah { 10926dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 10936dd4ee7cSKalpak Shah int new_offs; 10946dd4ee7cSKalpak Shah 10956dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 10966dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 10976dd4ee7cSKalpak Shah if (!last->e_value_block && last->e_value_size) { 10986dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 10996dd4ee7cSKalpak Shah value_offs_shift; 11006dd4ee7cSKalpak Shah BUG_ON(new_offs + le32_to_cpu(last->e_value_size) 11016dd4ee7cSKalpak Shah > blocksize); 11026dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 11036dd4ee7cSKalpak Shah } 11046dd4ee7cSKalpak Shah } 11056dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 11066dd4ee7cSKalpak Shah memmove(to, from, n); 11076dd4ee7cSKalpak Shah } 11086dd4ee7cSKalpak Shah 11096dd4ee7cSKalpak Shah /* 11106dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 11116dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 11126dd4ee7cSKalpak Shah */ 11136dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 11146dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 11156dd4ee7cSKalpak Shah { 11166dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 11176dd4ee7cSKalpak Shah struct ext4_xattr_entry *entry, *last, *first; 11186dd4ee7cSKalpak Shah struct buffer_head *bh = NULL; 11196dd4ee7cSKalpak Shah struct ext4_xattr_ibody_find *is = NULL; 11206dd4ee7cSKalpak Shah struct ext4_xattr_block_find *bs = NULL; 11216dd4ee7cSKalpak Shah char *buffer = NULL, *b_entry_name = NULL; 11226dd4ee7cSKalpak Shah size_t min_offs, free; 11236dd4ee7cSKalpak Shah int total_ino, total_blk; 11246dd4ee7cSKalpak Shah void *base, *start, *end; 11256dd4ee7cSKalpak Shah int extra_isize = 0, error = 0, tried_min_extra_isize = 0; 1126ac39849dSAneesh Kumar K.V int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); 11276dd4ee7cSKalpak Shah 11286dd4ee7cSKalpak Shah down_write(&EXT4_I(inode)->xattr_sem); 11296dd4ee7cSKalpak Shah retry: 11306dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) { 11316dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 11326dd4ee7cSKalpak Shah return 0; 11336dd4ee7cSKalpak Shah } 11346dd4ee7cSKalpak Shah 11356dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 11366dd4ee7cSKalpak Shah entry = IFIRST(header); 11376dd4ee7cSKalpak Shah 11386dd4ee7cSKalpak Shah /* 11396dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 11406dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 11416dd4ee7cSKalpak Shah */ 11426dd4ee7cSKalpak Shah 11436dd4ee7cSKalpak Shah base = start = entry; 11446dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 11456dd4ee7cSKalpak Shah min_offs = end - base; 11466dd4ee7cSKalpak Shah last = entry; 11476dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 11486dd4ee7cSKalpak Shah 11496dd4ee7cSKalpak Shah free = ext4_xattr_free_space(last, &min_offs, base, &total_ino); 11506dd4ee7cSKalpak Shah if (free >= new_extra_isize) { 11516dd4ee7cSKalpak Shah entry = IFIRST(header); 11526dd4ee7cSKalpak Shah ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize 11536dd4ee7cSKalpak Shah - new_extra_isize, (void *)raw_inode + 11546dd4ee7cSKalpak Shah EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 11556dd4ee7cSKalpak Shah (void *)header, total_ino, 11566dd4ee7cSKalpak Shah inode->i_sb->s_blocksize); 11576dd4ee7cSKalpak Shah EXT4_I(inode)->i_extra_isize = new_extra_isize; 11586dd4ee7cSKalpak Shah error = 0; 11596dd4ee7cSKalpak Shah goto cleanup; 11606dd4ee7cSKalpak Shah } 11616dd4ee7cSKalpak Shah 11626dd4ee7cSKalpak Shah /* 11636dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 11646dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 11656dd4ee7cSKalpak Shah */ 11666dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 11676dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 11686dd4ee7cSKalpak Shah error = -EIO; 11696dd4ee7cSKalpak Shah if (!bh) 11706dd4ee7cSKalpak Shah goto cleanup; 11716dd4ee7cSKalpak Shah if (ext4_xattr_check_block(bh)) { 117246e665e9SHarvey Harrison ext4_error(inode->i_sb, __func__, 11736dd4ee7cSKalpak Shah "inode %lu: bad block %llu", inode->i_ino, 11746dd4ee7cSKalpak Shah EXT4_I(inode)->i_file_acl); 11756dd4ee7cSKalpak Shah error = -EIO; 11766dd4ee7cSKalpak Shah goto cleanup; 11776dd4ee7cSKalpak Shah } 11786dd4ee7cSKalpak Shah base = BHDR(bh); 11796dd4ee7cSKalpak Shah first = BFIRST(bh); 11806dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 11816dd4ee7cSKalpak Shah min_offs = end - base; 11826dd4ee7cSKalpak Shah free = ext4_xattr_free_space(first, &min_offs, base, 11836dd4ee7cSKalpak Shah &total_blk); 11846dd4ee7cSKalpak Shah if (free < new_extra_isize) { 11856dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 11866dd4ee7cSKalpak Shah tried_min_extra_isize++; 11876dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 11886dd4ee7cSKalpak Shah brelse(bh); 11896dd4ee7cSKalpak Shah goto retry; 11906dd4ee7cSKalpak Shah } 11916dd4ee7cSKalpak Shah error = -1; 11926dd4ee7cSKalpak Shah goto cleanup; 11936dd4ee7cSKalpak Shah } 11946dd4ee7cSKalpak Shah } else { 11956dd4ee7cSKalpak Shah free = inode->i_sb->s_blocksize; 11966dd4ee7cSKalpak Shah } 11976dd4ee7cSKalpak Shah 11986dd4ee7cSKalpak Shah while (new_extra_isize > 0) { 11996dd4ee7cSKalpak Shah size_t offs, size, entry_size; 12006dd4ee7cSKalpak Shah struct ext4_xattr_entry *small_entry = NULL; 12016dd4ee7cSKalpak Shah struct ext4_xattr_info i = { 12026dd4ee7cSKalpak Shah .value = NULL, 12036dd4ee7cSKalpak Shah .value_len = 0, 12046dd4ee7cSKalpak Shah }; 12056dd4ee7cSKalpak Shah unsigned int total_size; /* EA entry size + value size */ 12066dd4ee7cSKalpak Shah unsigned int shift_bytes; /* No. of bytes to shift EAs by? */ 12076dd4ee7cSKalpak Shah unsigned int min_total_size = ~0U; 12086dd4ee7cSKalpak Shah 12096dd4ee7cSKalpak Shah is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 12106dd4ee7cSKalpak Shah bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 12116dd4ee7cSKalpak Shah if (!is || !bs) { 12126dd4ee7cSKalpak Shah error = -ENOMEM; 12136dd4ee7cSKalpak Shah goto cleanup; 12146dd4ee7cSKalpak Shah } 12156dd4ee7cSKalpak Shah 12166dd4ee7cSKalpak Shah is->s.not_found = -ENODATA; 12176dd4ee7cSKalpak Shah bs->s.not_found = -ENODATA; 12186dd4ee7cSKalpak Shah is->iloc.bh = NULL; 12196dd4ee7cSKalpak Shah bs->bh = NULL; 12206dd4ee7cSKalpak Shah 12216dd4ee7cSKalpak Shah last = IFIRST(header); 12226dd4ee7cSKalpak Shah /* Find the entry best suited to be pushed into EA block */ 12236dd4ee7cSKalpak Shah entry = NULL; 12246dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 12256dd4ee7cSKalpak Shah total_size = 12266dd4ee7cSKalpak Shah EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + 12276dd4ee7cSKalpak Shah EXT4_XATTR_LEN(last->e_name_len); 12286dd4ee7cSKalpak Shah if (total_size <= free && total_size < min_total_size) { 12296dd4ee7cSKalpak Shah if (total_size < new_extra_isize) { 12306dd4ee7cSKalpak Shah small_entry = last; 12316dd4ee7cSKalpak Shah } else { 12326dd4ee7cSKalpak Shah entry = last; 12336dd4ee7cSKalpak Shah min_total_size = total_size; 12346dd4ee7cSKalpak Shah } 12356dd4ee7cSKalpak Shah } 12366dd4ee7cSKalpak Shah } 12376dd4ee7cSKalpak Shah 12386dd4ee7cSKalpak Shah if (entry == NULL) { 12396dd4ee7cSKalpak Shah if (small_entry) { 12406dd4ee7cSKalpak Shah entry = small_entry; 12416dd4ee7cSKalpak Shah } else { 12426dd4ee7cSKalpak Shah if (!tried_min_extra_isize && 12436dd4ee7cSKalpak Shah s_min_extra_isize) { 12446dd4ee7cSKalpak Shah tried_min_extra_isize++; 12456dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 12466dd4ee7cSKalpak Shah goto retry; 12476dd4ee7cSKalpak Shah } 12486dd4ee7cSKalpak Shah error = -1; 12496dd4ee7cSKalpak Shah goto cleanup; 12506dd4ee7cSKalpak Shah } 12516dd4ee7cSKalpak Shah } 12526dd4ee7cSKalpak Shah offs = le16_to_cpu(entry->e_value_offs); 12536dd4ee7cSKalpak Shah size = le32_to_cpu(entry->e_value_size); 12546dd4ee7cSKalpak Shah entry_size = EXT4_XATTR_LEN(entry->e_name_len); 12556dd4ee7cSKalpak Shah i.name_index = entry->e_name_index, 12566dd4ee7cSKalpak Shah buffer = kmalloc(EXT4_XATTR_SIZE(size), GFP_NOFS); 12576dd4ee7cSKalpak Shah b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 12586dd4ee7cSKalpak Shah if (!buffer || !b_entry_name) { 12596dd4ee7cSKalpak Shah error = -ENOMEM; 12606dd4ee7cSKalpak Shah goto cleanup; 12616dd4ee7cSKalpak Shah } 12626dd4ee7cSKalpak Shah /* Save the entry name and the entry value */ 12636dd4ee7cSKalpak Shah memcpy(buffer, (void *)IFIRST(header) + offs, 12646dd4ee7cSKalpak Shah EXT4_XATTR_SIZE(size)); 12656dd4ee7cSKalpak Shah memcpy(b_entry_name, entry->e_name, entry->e_name_len); 12666dd4ee7cSKalpak Shah b_entry_name[entry->e_name_len] = '\0'; 12676dd4ee7cSKalpak Shah i.name = b_entry_name; 12686dd4ee7cSKalpak Shah 12696dd4ee7cSKalpak Shah error = ext4_get_inode_loc(inode, &is->iloc); 12706dd4ee7cSKalpak Shah if (error) 12716dd4ee7cSKalpak Shah goto cleanup; 12726dd4ee7cSKalpak Shah 12736dd4ee7cSKalpak Shah error = ext4_xattr_ibody_find(inode, &i, is); 12746dd4ee7cSKalpak Shah if (error) 12756dd4ee7cSKalpak Shah goto cleanup; 12766dd4ee7cSKalpak Shah 12776dd4ee7cSKalpak Shah /* Remove the chosen entry from the inode */ 12786dd4ee7cSKalpak Shah error = ext4_xattr_ibody_set(handle, inode, &i, is); 12796dd4ee7cSKalpak Shah 12806dd4ee7cSKalpak Shah entry = IFIRST(header); 12816dd4ee7cSKalpak Shah if (entry_size + EXT4_XATTR_SIZE(size) >= new_extra_isize) 12826dd4ee7cSKalpak Shah shift_bytes = new_extra_isize; 12836dd4ee7cSKalpak Shah else 12846dd4ee7cSKalpak Shah shift_bytes = entry_size + size; 12856dd4ee7cSKalpak Shah /* Adjust the offsets and shift the remaining entries ahead */ 12866dd4ee7cSKalpak Shah ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize - 12876dd4ee7cSKalpak Shah shift_bytes, (void *)raw_inode + 12886dd4ee7cSKalpak Shah EXT4_GOOD_OLD_INODE_SIZE + extra_isize + shift_bytes, 12896dd4ee7cSKalpak Shah (void *)header, total_ino - entry_size, 12906dd4ee7cSKalpak Shah inode->i_sb->s_blocksize); 12916dd4ee7cSKalpak Shah 12926dd4ee7cSKalpak Shah extra_isize += shift_bytes; 12936dd4ee7cSKalpak Shah new_extra_isize -= shift_bytes; 12946dd4ee7cSKalpak Shah EXT4_I(inode)->i_extra_isize = extra_isize; 12956dd4ee7cSKalpak Shah 12966dd4ee7cSKalpak Shah i.name = b_entry_name; 12976dd4ee7cSKalpak Shah i.value = buffer; 1298ac39849dSAneesh Kumar K.V i.value_len = size; 12996dd4ee7cSKalpak Shah error = ext4_xattr_block_find(inode, &i, bs); 13006dd4ee7cSKalpak Shah if (error) 13016dd4ee7cSKalpak Shah goto cleanup; 13026dd4ee7cSKalpak Shah 13036dd4ee7cSKalpak Shah /* Add entry which was removed from the inode into the block */ 13046dd4ee7cSKalpak Shah error = ext4_xattr_block_set(handle, inode, &i, bs); 13056dd4ee7cSKalpak Shah if (error) 13066dd4ee7cSKalpak Shah goto cleanup; 13076dd4ee7cSKalpak Shah kfree(b_entry_name); 13086dd4ee7cSKalpak Shah kfree(buffer); 13096dd4ee7cSKalpak Shah brelse(is->iloc.bh); 13106dd4ee7cSKalpak Shah kfree(is); 13116dd4ee7cSKalpak Shah kfree(bs); 13126dd4ee7cSKalpak Shah } 13136dd4ee7cSKalpak Shah brelse(bh); 13146dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 13156dd4ee7cSKalpak Shah return 0; 13166dd4ee7cSKalpak Shah 13176dd4ee7cSKalpak Shah cleanup: 13186dd4ee7cSKalpak Shah kfree(b_entry_name); 13196dd4ee7cSKalpak Shah kfree(buffer); 13206dd4ee7cSKalpak Shah if (is) 13216dd4ee7cSKalpak Shah brelse(is->iloc.bh); 13226dd4ee7cSKalpak Shah kfree(is); 13236dd4ee7cSKalpak Shah kfree(bs); 13246dd4ee7cSKalpak Shah brelse(bh); 13256dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 13266dd4ee7cSKalpak Shah return error; 13276dd4ee7cSKalpak Shah } 13286dd4ee7cSKalpak Shah 13296dd4ee7cSKalpak Shah 13306dd4ee7cSKalpak Shah 13316dd4ee7cSKalpak Shah /* 1332617ba13bSMingming Cao * ext4_xattr_delete_inode() 1333ac27a0ecSDave Kleikamp * 1334ac27a0ecSDave Kleikamp * Free extended attribute resources associated with this inode. This 1335ac27a0ecSDave Kleikamp * is called immediately before an inode is freed. We have exclusive 1336ac27a0ecSDave Kleikamp * access to the inode. 1337ac27a0ecSDave Kleikamp */ 1338ac27a0ecSDave Kleikamp void 1339617ba13bSMingming Cao ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) 1340ac27a0ecSDave Kleikamp { 1341ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 1342ac27a0ecSDave Kleikamp 1343617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 1344ac27a0ecSDave Kleikamp goto cleanup; 1345617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 1346ac27a0ecSDave Kleikamp if (!bh) { 134746e665e9SHarvey Harrison ext4_error(inode->i_sb, __func__, 13482ae02107SMingming Cao "inode %lu: block %llu read error", inode->i_ino, 1349617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 1350ac27a0ecSDave Kleikamp goto cleanup; 1351ac27a0ecSDave Kleikamp } 1352617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 1353ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) { 135446e665e9SHarvey Harrison ext4_error(inode->i_sb, __func__, 13552ae02107SMingming Cao "inode %lu: bad block %llu", inode->i_ino, 1356617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 1357ac27a0ecSDave Kleikamp goto cleanup; 1358ac27a0ecSDave Kleikamp } 1359617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bh); 1360617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 1361ac27a0ecSDave Kleikamp 1362ac27a0ecSDave Kleikamp cleanup: 1363ac27a0ecSDave Kleikamp brelse(bh); 1364ac27a0ecSDave Kleikamp } 1365ac27a0ecSDave Kleikamp 1366ac27a0ecSDave Kleikamp /* 1367617ba13bSMingming Cao * ext4_xattr_put_super() 1368ac27a0ecSDave Kleikamp * 1369ac27a0ecSDave Kleikamp * This is called when a file system is unmounted. 1370ac27a0ecSDave Kleikamp */ 1371ac27a0ecSDave Kleikamp void 1372617ba13bSMingming Cao ext4_xattr_put_super(struct super_block *sb) 1373ac27a0ecSDave Kleikamp { 1374ac27a0ecSDave Kleikamp mb_cache_shrink(sb->s_bdev); 1375ac27a0ecSDave Kleikamp } 1376ac27a0ecSDave Kleikamp 1377ac27a0ecSDave Kleikamp /* 1378617ba13bSMingming Cao * ext4_xattr_cache_insert() 1379ac27a0ecSDave Kleikamp * 1380ac27a0ecSDave Kleikamp * Create a new entry in the extended attribute cache, and insert 1381ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 1382ac27a0ecSDave Kleikamp * 1383ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1384ac27a0ecSDave Kleikamp */ 1385ac27a0ecSDave Kleikamp static void 1386617ba13bSMingming Cao ext4_xattr_cache_insert(struct buffer_head *bh) 1387ac27a0ecSDave Kleikamp { 1388ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(BHDR(bh)->h_hash); 1389ac27a0ecSDave Kleikamp struct mb_cache_entry *ce; 1390ac27a0ecSDave Kleikamp int error; 1391ac27a0ecSDave Kleikamp 1392335e92e8SJan Kara ce = mb_cache_entry_alloc(ext4_xattr_cache, GFP_NOFS); 1393ac27a0ecSDave Kleikamp if (!ce) { 1394ac27a0ecSDave Kleikamp ea_bdebug(bh, "out of memory"); 1395ac27a0ecSDave Kleikamp return; 1396ac27a0ecSDave Kleikamp } 1397ac27a0ecSDave Kleikamp error = mb_cache_entry_insert(ce, bh->b_bdev, bh->b_blocknr, &hash); 1398ac27a0ecSDave Kleikamp if (error) { 1399ac27a0ecSDave Kleikamp mb_cache_entry_free(ce); 1400ac27a0ecSDave Kleikamp if (error == -EBUSY) { 1401ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 1402ac27a0ecSDave Kleikamp error = 0; 1403ac27a0ecSDave Kleikamp } 1404ac27a0ecSDave Kleikamp } else { 1405ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 1406ac27a0ecSDave Kleikamp mb_cache_entry_release(ce); 1407ac27a0ecSDave Kleikamp } 1408ac27a0ecSDave Kleikamp } 1409ac27a0ecSDave Kleikamp 1410ac27a0ecSDave Kleikamp /* 1411617ba13bSMingming Cao * ext4_xattr_cmp() 1412ac27a0ecSDave Kleikamp * 1413ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 1414ac27a0ecSDave Kleikamp * 1415ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 1416ac27a0ecSDave Kleikamp * a negative error number on errors. 1417ac27a0ecSDave Kleikamp */ 1418ac27a0ecSDave Kleikamp static int 1419617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 1420617ba13bSMingming Cao struct ext4_xattr_header *header2) 1421ac27a0ecSDave Kleikamp { 1422617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 1423ac27a0ecSDave Kleikamp 1424ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 1425ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 1426ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 1427ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 1428ac27a0ecSDave Kleikamp return 1; 1429ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 1430ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 1431ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 1432ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 1433ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 1434ac27a0ecSDave Kleikamp return 1; 1435ac27a0ecSDave Kleikamp if (entry1->e_value_block != 0 || entry2->e_value_block != 0) 1436ac27a0ecSDave Kleikamp return -EIO; 1437ac27a0ecSDave Kleikamp if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 1438ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 1439ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 1440ac27a0ecSDave Kleikamp return 1; 1441ac27a0ecSDave Kleikamp 1442617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 1443617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 1444ac27a0ecSDave Kleikamp } 1445ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 1446ac27a0ecSDave Kleikamp return 1; 1447ac27a0ecSDave Kleikamp return 0; 1448ac27a0ecSDave Kleikamp } 1449ac27a0ecSDave Kleikamp 1450ac27a0ecSDave Kleikamp /* 1451617ba13bSMingming Cao * ext4_xattr_cache_find() 1452ac27a0ecSDave Kleikamp * 1453ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 1454ac27a0ecSDave Kleikamp * 1455ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 1456ac27a0ecSDave Kleikamp * not found or an error occurred. 1457ac27a0ecSDave Kleikamp */ 1458ac27a0ecSDave Kleikamp static struct buffer_head * 1459617ba13bSMingming Cao ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, 1460ac27a0ecSDave Kleikamp struct mb_cache_entry **pce) 1461ac27a0ecSDave Kleikamp { 1462ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 1463ac27a0ecSDave Kleikamp struct mb_cache_entry *ce; 1464ac27a0ecSDave Kleikamp 1465ac27a0ecSDave Kleikamp if (!header->h_hash) 1466ac27a0ecSDave Kleikamp return NULL; /* never share */ 1467ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 1468ac27a0ecSDave Kleikamp again: 1469617ba13bSMingming Cao ce = mb_cache_entry_find_first(ext4_xattr_cache, 0, 1470ac27a0ecSDave Kleikamp inode->i_sb->s_bdev, hash); 1471ac27a0ecSDave Kleikamp while (ce) { 1472ac27a0ecSDave Kleikamp struct buffer_head *bh; 1473ac27a0ecSDave Kleikamp 1474ac27a0ecSDave Kleikamp if (IS_ERR(ce)) { 1475ac27a0ecSDave Kleikamp if (PTR_ERR(ce) == -EAGAIN) 1476ac27a0ecSDave Kleikamp goto again; 1477ac27a0ecSDave Kleikamp break; 1478ac27a0ecSDave Kleikamp } 1479ac27a0ecSDave Kleikamp bh = sb_bread(inode->i_sb, ce->e_block); 1480ac27a0ecSDave Kleikamp if (!bh) { 148146e665e9SHarvey Harrison ext4_error(inode->i_sb, __func__, 1482ac27a0ecSDave Kleikamp "inode %lu: block %lu read error", 1483ac27a0ecSDave Kleikamp inode->i_ino, (unsigned long) ce->e_block); 1484ac27a0ecSDave Kleikamp } else if (le32_to_cpu(BHDR(bh)->h_refcount) >= 1485617ba13bSMingming Cao EXT4_XATTR_REFCOUNT_MAX) { 1486ac27a0ecSDave Kleikamp ea_idebug(inode, "block %lu refcount %d>=%d", 1487ac27a0ecSDave Kleikamp (unsigned long) ce->e_block, 1488ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount), 1489617ba13bSMingming Cao EXT4_XATTR_REFCOUNT_MAX); 1490617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 1491ac27a0ecSDave Kleikamp *pce = ce; 1492ac27a0ecSDave Kleikamp return bh; 1493ac27a0ecSDave Kleikamp } 1494ac27a0ecSDave Kleikamp brelse(bh); 1495ac27a0ecSDave Kleikamp ce = mb_cache_entry_find_next(ce, 0, inode->i_sb->s_bdev, hash); 1496ac27a0ecSDave Kleikamp } 1497ac27a0ecSDave Kleikamp return NULL; 1498ac27a0ecSDave Kleikamp } 1499ac27a0ecSDave Kleikamp 1500ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 1501ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 1502ac27a0ecSDave Kleikamp 1503ac27a0ecSDave Kleikamp /* 1504617ba13bSMingming Cao * ext4_xattr_hash_entry() 1505ac27a0ecSDave Kleikamp * 1506ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 1507ac27a0ecSDave Kleikamp */ 1508617ba13bSMingming Cao static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, 1509617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1510ac27a0ecSDave Kleikamp { 1511ac27a0ecSDave Kleikamp __u32 hash = 0; 1512ac27a0ecSDave Kleikamp char *name = entry->e_name; 1513ac27a0ecSDave Kleikamp int n; 1514ac27a0ecSDave Kleikamp 1515ac27a0ecSDave Kleikamp for (n=0; n < entry->e_name_len; n++) { 1516ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 1517ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 1518ac27a0ecSDave Kleikamp *name++; 1519ac27a0ecSDave Kleikamp } 1520ac27a0ecSDave Kleikamp 1521ac27a0ecSDave Kleikamp if (entry->e_value_block == 0 && entry->e_value_size != 0) { 1522ac27a0ecSDave Kleikamp __le32 *value = (__le32 *)((char *)header + 1523ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs)); 1524ac27a0ecSDave Kleikamp for (n = (le32_to_cpu(entry->e_value_size) + 1525617ba13bSMingming Cao EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { 1526ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 1527ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 1528ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 1529ac27a0ecSDave Kleikamp } 1530ac27a0ecSDave Kleikamp } 1531ac27a0ecSDave Kleikamp entry->e_hash = cpu_to_le32(hash); 1532ac27a0ecSDave Kleikamp } 1533ac27a0ecSDave Kleikamp 1534ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 1535ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 1536ac27a0ecSDave Kleikamp 1537ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 1538ac27a0ecSDave Kleikamp 1539ac27a0ecSDave Kleikamp /* 1540617ba13bSMingming Cao * ext4_xattr_rehash() 1541ac27a0ecSDave Kleikamp * 1542ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 1543ac27a0ecSDave Kleikamp */ 1544617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *header, 1545617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1546ac27a0ecSDave Kleikamp { 1547617ba13bSMingming Cao struct ext4_xattr_entry *here; 1548ac27a0ecSDave Kleikamp __u32 hash = 0; 1549ac27a0ecSDave Kleikamp 1550617ba13bSMingming Cao ext4_xattr_hash_entry(header, entry); 1551ac27a0ecSDave Kleikamp here = ENTRY(header+1); 1552ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 1553ac27a0ecSDave Kleikamp if (!here->e_hash) { 1554ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 1555ac27a0ecSDave Kleikamp hash = 0; 1556ac27a0ecSDave Kleikamp break; 1557ac27a0ecSDave Kleikamp } 1558ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 1559ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 1560ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 1561617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 1562ac27a0ecSDave Kleikamp } 1563ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 1564ac27a0ecSDave Kleikamp } 1565ac27a0ecSDave Kleikamp 1566ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 1567ac27a0ecSDave Kleikamp 1568ac27a0ecSDave Kleikamp int __init 1569617ba13bSMingming Cao init_ext4_xattr(void) 1570ac27a0ecSDave Kleikamp { 1571617ba13bSMingming Cao ext4_xattr_cache = mb_cache_create("ext4_xattr", NULL, 1572ac27a0ecSDave Kleikamp sizeof(struct mb_cache_entry) + 1573ac27a0ecSDave Kleikamp sizeof(((struct mb_cache_entry *) 0)->e_indexes[0]), 1, 6); 1574617ba13bSMingming Cao if (!ext4_xattr_cache) 1575ac27a0ecSDave Kleikamp return -ENOMEM; 1576ac27a0ecSDave Kleikamp return 0; 1577ac27a0ecSDave Kleikamp } 1578ac27a0ecSDave Kleikamp 1579ac27a0ecSDave Kleikamp void 1580617ba13bSMingming Cao exit_ext4_xattr(void) 1581ac27a0ecSDave Kleikamp { 1582617ba13bSMingming Cao if (ext4_xattr_cache) 1583617ba13bSMingming Cao mb_cache_destroy(ext4_xattr_cache); 1584617ba13bSMingming Cao ext4_xattr_cache = NULL; 1585ac27a0ecSDave Kleikamp } 1586