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> 567a2508e1SJan Kara #include <linux/mbcache.h> 57ac27a0ecSDave Kleikamp #include <linux/quotaops.h> 583dcf5451SChristoph Hellwig #include "ext4_jbd2.h" 593dcf5451SChristoph Hellwig #include "ext4.h" 60ac27a0ecSDave Kleikamp #include "xattr.h" 61ac27a0ecSDave Kleikamp #include "acl.h" 62ac27a0ecSDave Kleikamp 63617ba13bSMingming Cao #ifdef EXT4_XATTR_DEBUG 64d74f3d25SJoe Perches # define ea_idebug(inode, fmt, ...) \ 65d74f3d25SJoe Perches printk(KERN_DEBUG "inode %s:%lu: " fmt "\n", \ 66d74f3d25SJoe Perches inode->i_sb->s_id, inode->i_ino, ##__VA_ARGS__) 67d74f3d25SJoe Perches # define ea_bdebug(bh, fmt, ...) \ 68d74f3d25SJoe Perches printk(KERN_DEBUG "block %pg:%lu: " fmt "\n", \ 69d74f3d25SJoe Perches bh->b_bdev, (unsigned long)bh->b_blocknr, ##__VA_ARGS__) 70ac27a0ecSDave Kleikamp #else 71ace36ad4SJoe Perches # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 72ace36ad4SJoe Perches # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 73ac27a0ecSDave Kleikamp #endif 74ac27a0ecSDave Kleikamp 757a2508e1SJan Kara static void ext4_xattr_cache_insert(struct mb_cache *, struct buffer_head *); 76617ba13bSMingming Cao static struct buffer_head *ext4_xattr_cache_find(struct inode *, 77617ba13bSMingming Cao struct ext4_xattr_header *, 787a2508e1SJan Kara struct mb_cache_entry **); 79617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *, 80617ba13bSMingming Cao struct ext4_xattr_entry *); 81431547b3SChristoph Hellwig static int ext4_xattr_list(struct dentry *dentry, char *buffer, 82d3a95d47SMingming Cao size_t buffer_size); 83ac27a0ecSDave Kleikamp 8411e27528SStephen Hemminger static const struct xattr_handler *ext4_xattr_handler_map[] = { 85617ba13bSMingming Cao [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, 8603010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 8764e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, 8864e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, 89ac27a0ecSDave Kleikamp #endif 90617ba13bSMingming Cao [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, 9103010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 92617ba13bSMingming Cao [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, 93ac27a0ecSDave Kleikamp #endif 94ac27a0ecSDave Kleikamp }; 95ac27a0ecSDave Kleikamp 9611e27528SStephen Hemminger const struct xattr_handler *ext4_xattr_handlers[] = { 97617ba13bSMingming Cao &ext4_xattr_user_handler, 98617ba13bSMingming Cao &ext4_xattr_trusted_handler, 9903010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 10064e178a7SChristoph Hellwig &posix_acl_access_xattr_handler, 10164e178a7SChristoph Hellwig &posix_acl_default_xattr_handler, 102ac27a0ecSDave Kleikamp #endif 10303010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 104617ba13bSMingming Cao &ext4_xattr_security_handler, 105ac27a0ecSDave Kleikamp #endif 106ac27a0ecSDave Kleikamp NULL 107ac27a0ecSDave Kleikamp }; 108ac27a0ecSDave Kleikamp 1099c191f70ST Makphaibulchoke #define EXT4_GET_MB_CACHE(inode) (((struct ext4_sb_info *) \ 1109c191f70ST Makphaibulchoke inode->i_sb->s_fs_info)->s_mb_cache) 1119c191f70ST Makphaibulchoke 112cc8e94fdSDarrick J. Wong static __le32 ext4_xattr_block_csum(struct inode *inode, 113cc8e94fdSDarrick J. Wong sector_t block_nr, 114cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 115cc8e94fdSDarrick J. Wong { 116cc8e94fdSDarrick J. Wong struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 117d6a77105STheodore Ts'o __u32 csum; 118d6a77105STheodore Ts'o __le64 dsk_block_nr = cpu_to_le64(block_nr); 119b47820edSDaeho Jeong __u32 dummy_csum = 0; 120b47820edSDaeho Jeong int offset = offsetof(struct ext4_xattr_header, h_checksum); 121cc8e94fdSDarrick J. Wong 122d6a77105STheodore Ts'o csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, 123d6a77105STheodore Ts'o sizeof(dsk_block_nr)); 124b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); 125b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); 126b47820edSDaeho Jeong offset += sizeof(dummy_csum); 127b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, 128b47820edSDaeho Jeong EXT4_BLOCK_SIZE(inode->i_sb) - offset); 12941eb70ddSTao Ma 130cc8e94fdSDarrick J. Wong return cpu_to_le32(csum); 131cc8e94fdSDarrick J. Wong } 132cc8e94fdSDarrick J. Wong 133cc8e94fdSDarrick J. Wong static int ext4_xattr_block_csum_verify(struct inode *inode, 134cc8e94fdSDarrick J. Wong sector_t block_nr, 135cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 136cc8e94fdSDarrick J. Wong { 1379aa5d32bSDmitry Monakhov if (ext4_has_metadata_csum(inode->i_sb) && 138cc8e94fdSDarrick J. Wong (hdr->h_checksum != ext4_xattr_block_csum(inode, block_nr, hdr))) 139cc8e94fdSDarrick J. Wong return 0; 140cc8e94fdSDarrick J. Wong return 1; 141cc8e94fdSDarrick J. Wong } 142cc8e94fdSDarrick J. Wong 143cc8e94fdSDarrick J. Wong static void ext4_xattr_block_csum_set(struct inode *inode, 144cc8e94fdSDarrick J. Wong sector_t block_nr, 145cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 146cc8e94fdSDarrick J. Wong { 1479aa5d32bSDmitry Monakhov if (!ext4_has_metadata_csum(inode->i_sb)) 148cc8e94fdSDarrick J. Wong return; 149cc8e94fdSDarrick J. Wong 150cc8e94fdSDarrick J. Wong hdr->h_checksum = ext4_xattr_block_csum(inode, block_nr, hdr); 151cc8e94fdSDarrick J. Wong } 152cc8e94fdSDarrick J. Wong 153cc8e94fdSDarrick J. Wong static inline int ext4_handle_dirty_xattr_block(handle_t *handle, 154cc8e94fdSDarrick J. Wong struct inode *inode, 155cc8e94fdSDarrick J. Wong struct buffer_head *bh) 156cc8e94fdSDarrick J. Wong { 157cc8e94fdSDarrick J. Wong ext4_xattr_block_csum_set(inode, bh->b_blocknr, BHDR(bh)); 158cc8e94fdSDarrick J. Wong return ext4_handle_dirty_metadata(handle, inode, bh); 159cc8e94fdSDarrick J. Wong } 160cc8e94fdSDarrick J. Wong 16111e27528SStephen Hemminger static inline const struct xattr_handler * 162617ba13bSMingming Cao ext4_xattr_handler(int name_index) 163ac27a0ecSDave Kleikamp { 16411e27528SStephen Hemminger const struct xattr_handler *handler = NULL; 165ac27a0ecSDave Kleikamp 166617ba13bSMingming Cao if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) 167617ba13bSMingming Cao handler = ext4_xattr_handler_map[name_index]; 168ac27a0ecSDave Kleikamp return handler; 169ac27a0ecSDave Kleikamp } 170ac27a0ecSDave Kleikamp 171ac27a0ecSDave Kleikamp /* 172ac27a0ecSDave Kleikamp * Inode operation listxattr() 173ac27a0ecSDave Kleikamp * 1742b0143b5SDavid Howells * d_inode(dentry)->i_mutex: don't care 175ac27a0ecSDave Kleikamp */ 176ac27a0ecSDave Kleikamp ssize_t 177617ba13bSMingming Cao ext4_listxattr(struct dentry *dentry, char *buffer, size_t size) 178ac27a0ecSDave Kleikamp { 179431547b3SChristoph Hellwig return ext4_xattr_list(dentry, buffer, size); 180ac27a0ecSDave Kleikamp } 181ac27a0ecSDave Kleikamp 182ac27a0ecSDave Kleikamp static int 183a0626e75SDarrick J. Wong ext4_xattr_check_names(struct ext4_xattr_entry *entry, void *end, 184a0626e75SDarrick J. Wong void *value_start) 185ac27a0ecSDave Kleikamp { 186a0626e75SDarrick J. Wong struct ext4_xattr_entry *e = entry; 187a0626e75SDarrick J. Wong 188a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(e)) { 189a0626e75SDarrick J. Wong struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); 190ac27a0ecSDave Kleikamp if ((void *)next >= end) 1916a797d27SDarrick J. Wong return -EFSCORRUPTED; 192a0626e75SDarrick J. Wong e = next; 193ac27a0ecSDave Kleikamp } 194a0626e75SDarrick J. Wong 195a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(entry)) { 1962de58f11SJan Kara if (entry->e_value_block != 0) 1972de58f11SJan Kara return -EFSCORRUPTED; 198a0626e75SDarrick J. Wong if (entry->e_value_size != 0 && 199a0626e75SDarrick J. Wong (value_start + le16_to_cpu(entry->e_value_offs) < 200a0626e75SDarrick J. Wong (void *)e + sizeof(__u32) || 201a0626e75SDarrick J. Wong value_start + le16_to_cpu(entry->e_value_offs) + 202a0626e75SDarrick J. Wong le32_to_cpu(entry->e_value_size) > end)) 2036a797d27SDarrick J. Wong return -EFSCORRUPTED; 204a0626e75SDarrick J. Wong entry = EXT4_XATTR_NEXT(entry); 205a0626e75SDarrick J. Wong } 206a0626e75SDarrick J. Wong 207ac27a0ecSDave Kleikamp return 0; 208ac27a0ecSDave Kleikamp } 209ac27a0ecSDave Kleikamp 210ac27a0ecSDave Kleikamp static inline int 211cc8e94fdSDarrick J. Wong ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) 212ac27a0ecSDave Kleikamp { 213cc8e94fdSDarrick J. Wong int error; 214cc8e94fdSDarrick J. Wong 215cc8e94fdSDarrick J. Wong if (buffer_verified(bh)) 216cc8e94fdSDarrick J. Wong return 0; 217cc8e94fdSDarrick J. Wong 218617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 219ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) 2206a797d27SDarrick J. Wong return -EFSCORRUPTED; 221cc8e94fdSDarrick J. Wong if (!ext4_xattr_block_csum_verify(inode, bh->b_blocknr, BHDR(bh))) 2226a797d27SDarrick J. Wong return -EFSBADCRC; 223a0626e75SDarrick J. Wong error = ext4_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size, 224a0626e75SDarrick J. Wong bh->b_data); 225cc8e94fdSDarrick J. Wong if (!error) 226cc8e94fdSDarrick J. Wong set_buffer_verified(bh); 227cc8e94fdSDarrick J. Wong return error; 228ac27a0ecSDave Kleikamp } 229ac27a0ecSDave Kleikamp 2309e92f48cSTheodore Ts'o static int 2319e92f48cSTheodore Ts'o __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, 2329e92f48cSTheodore Ts'o void *end, const char *function, unsigned int line) 2339e92f48cSTheodore Ts'o { 2349e92f48cSTheodore Ts'o struct ext4_xattr_entry *entry = IFIRST(header); 2359e92f48cSTheodore Ts'o int error = -EFSCORRUPTED; 2369e92f48cSTheodore Ts'o 2379e92f48cSTheodore Ts'o if (((void *) header >= end) || 23819962509SEric Biggers (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) 2399e92f48cSTheodore Ts'o goto errout; 2409e92f48cSTheodore Ts'o error = ext4_xattr_check_names(entry, end, entry); 2419e92f48cSTheodore Ts'o errout: 2429e92f48cSTheodore Ts'o if (error) 2439e92f48cSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, 2449e92f48cSTheodore Ts'o "corrupted in-inode xattr"); 2459e92f48cSTheodore Ts'o return error; 2469e92f48cSTheodore Ts'o } 2479e92f48cSTheodore Ts'o 2489e92f48cSTheodore Ts'o #define xattr_check_inode(inode, header, end) \ 2499e92f48cSTheodore Ts'o __xattr_check_inode((inode), (header), (end), __func__, __LINE__) 2509e92f48cSTheodore Ts'o 251ac27a0ecSDave Kleikamp static inline int 252617ba13bSMingming Cao ext4_xattr_check_entry(struct ext4_xattr_entry *entry, size_t size) 253ac27a0ecSDave Kleikamp { 254ac27a0ecSDave Kleikamp size_t value_size = le32_to_cpu(entry->e_value_size); 255ac27a0ecSDave Kleikamp 256ac27a0ecSDave Kleikamp if (entry->e_value_block != 0 || value_size > size || 257ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs) + value_size > size) 2586a797d27SDarrick J. Wong return -EFSCORRUPTED; 259ac27a0ecSDave Kleikamp return 0; 260ac27a0ecSDave Kleikamp } 261ac27a0ecSDave Kleikamp 262ac27a0ecSDave Kleikamp static int 263617ba13bSMingming Cao ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, 264ac27a0ecSDave Kleikamp const char *name, size_t size, int sorted) 265ac27a0ecSDave Kleikamp { 266617ba13bSMingming Cao struct ext4_xattr_entry *entry; 267ac27a0ecSDave Kleikamp size_t name_len; 268ac27a0ecSDave Kleikamp int cmp = 1; 269ac27a0ecSDave Kleikamp 270ac27a0ecSDave Kleikamp if (name == NULL) 271ac27a0ecSDave Kleikamp return -EINVAL; 272ac27a0ecSDave Kleikamp name_len = strlen(name); 273ac27a0ecSDave Kleikamp entry = *pentry; 274617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 275ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 276ac27a0ecSDave Kleikamp if (!cmp) 277ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 278ac27a0ecSDave Kleikamp if (!cmp) 279ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 280ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 281ac27a0ecSDave Kleikamp break; 282ac27a0ecSDave Kleikamp } 283ac27a0ecSDave Kleikamp *pentry = entry; 284617ba13bSMingming Cao if (!cmp && ext4_xattr_check_entry(entry, size)) 2856a797d27SDarrick J. Wong return -EFSCORRUPTED; 286ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 287ac27a0ecSDave Kleikamp } 288ac27a0ecSDave Kleikamp 289ac27a0ecSDave Kleikamp static int 290617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 291ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 292ac27a0ecSDave Kleikamp { 293ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 294617ba13bSMingming Cao struct ext4_xattr_entry *entry; 295ac27a0ecSDave Kleikamp size_t size; 296ac27a0ecSDave Kleikamp int error; 2977a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 298ac27a0ecSDave Kleikamp 299ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 300ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 301ac27a0ecSDave Kleikamp 302ac27a0ecSDave Kleikamp error = -ENODATA; 303617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 304ac27a0ecSDave Kleikamp goto cleanup; 305ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 306ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 307617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 308ac27a0ecSDave Kleikamp if (!bh) 309ac27a0ecSDave Kleikamp goto cleanup; 310ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 311ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 312cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 31312062dddSEric Sandeen bad_block: 31424676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 315617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 3166a797d27SDarrick J. Wong error = -EFSCORRUPTED; 317ac27a0ecSDave Kleikamp goto cleanup; 318ac27a0ecSDave Kleikamp } 3199c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, bh); 320ac27a0ecSDave Kleikamp entry = BFIRST(bh); 321617ba13bSMingming Cao error = ext4_xattr_find_entry(&entry, name_index, name, bh->b_size, 1); 3226a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 323ac27a0ecSDave Kleikamp goto bad_block; 324ac27a0ecSDave Kleikamp if (error) 325ac27a0ecSDave Kleikamp goto cleanup; 326ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 327ac27a0ecSDave Kleikamp if (buffer) { 328ac27a0ecSDave Kleikamp error = -ERANGE; 329ac27a0ecSDave Kleikamp if (size > buffer_size) 330ac27a0ecSDave Kleikamp goto cleanup; 331ac27a0ecSDave Kleikamp memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs), 332ac27a0ecSDave Kleikamp size); 333ac27a0ecSDave Kleikamp } 334ac27a0ecSDave Kleikamp error = size; 335ac27a0ecSDave Kleikamp 336ac27a0ecSDave Kleikamp cleanup: 337ac27a0ecSDave Kleikamp brelse(bh); 338ac27a0ecSDave Kleikamp return error; 339ac27a0ecSDave Kleikamp } 340ac27a0ecSDave Kleikamp 341879b3825STao Ma int 342617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 343ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 344ac27a0ecSDave Kleikamp { 345617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 346617ba13bSMingming Cao struct ext4_xattr_entry *entry; 347617ba13bSMingming Cao struct ext4_inode *raw_inode; 348617ba13bSMingming Cao struct ext4_iloc iloc; 349ac27a0ecSDave Kleikamp size_t size; 350ac27a0ecSDave Kleikamp void *end; 351ac27a0ecSDave Kleikamp int error; 352ac27a0ecSDave Kleikamp 35319f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 354ac27a0ecSDave Kleikamp return -ENODATA; 355617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 356ac27a0ecSDave Kleikamp if (error) 357ac27a0ecSDave Kleikamp return error; 358617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 359ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 360ac27a0ecSDave Kleikamp entry = IFIRST(header); 361617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 3629e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 363ac27a0ecSDave Kleikamp if (error) 364ac27a0ecSDave Kleikamp goto cleanup; 365617ba13bSMingming Cao error = ext4_xattr_find_entry(&entry, name_index, name, 366ac27a0ecSDave Kleikamp end - (void *)entry, 0); 367ac27a0ecSDave Kleikamp if (error) 368ac27a0ecSDave Kleikamp goto cleanup; 369ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 370ac27a0ecSDave Kleikamp if (buffer) { 371ac27a0ecSDave Kleikamp error = -ERANGE; 372ac27a0ecSDave Kleikamp if (size > buffer_size) 373ac27a0ecSDave Kleikamp goto cleanup; 374ac27a0ecSDave Kleikamp memcpy(buffer, (void *)IFIRST(header) + 375ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs), size); 376ac27a0ecSDave Kleikamp } 377ac27a0ecSDave Kleikamp error = size; 378ac27a0ecSDave Kleikamp 379ac27a0ecSDave Kleikamp cleanup: 380ac27a0ecSDave Kleikamp brelse(iloc.bh); 381ac27a0ecSDave Kleikamp return error; 382ac27a0ecSDave Kleikamp } 383ac27a0ecSDave Kleikamp 384ac27a0ecSDave Kleikamp /* 385617ba13bSMingming Cao * ext4_xattr_get() 386ac27a0ecSDave Kleikamp * 387ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 388ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 389ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 390ac27a0ecSDave Kleikamp * 391ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 392ac27a0ecSDave Kleikamp * used / required on success. 393ac27a0ecSDave Kleikamp */ 394ac27a0ecSDave Kleikamp int 395617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 396ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 397ac27a0ecSDave Kleikamp { 398ac27a0ecSDave Kleikamp int error; 399ac27a0ecSDave Kleikamp 400230b8c1aSZhang Zhen if (strlen(name) > 255) 401230b8c1aSZhang Zhen return -ERANGE; 402230b8c1aSZhang Zhen 403617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 404617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 405ac27a0ecSDave Kleikamp buffer_size); 406ac27a0ecSDave Kleikamp if (error == -ENODATA) 407617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 408ac27a0ecSDave Kleikamp buffer_size); 409617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 410ac27a0ecSDave Kleikamp return error; 411ac27a0ecSDave Kleikamp } 412ac27a0ecSDave Kleikamp 413ac27a0ecSDave Kleikamp static int 414431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 415ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 416ac27a0ecSDave Kleikamp { 417ac27a0ecSDave Kleikamp size_t rest = buffer_size; 418ac27a0ecSDave Kleikamp 419617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 42011e27528SStephen Hemminger const struct xattr_handler *handler = 421617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 422ac27a0ecSDave Kleikamp 423764a5c6bSAndreas Gruenbacher if (handler && (!handler->list || handler->list(dentry))) { 424764a5c6bSAndreas Gruenbacher const char *prefix = handler->prefix ?: handler->name; 425764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 426764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 427764a5c6bSAndreas Gruenbacher 428ac27a0ecSDave Kleikamp if (buffer) { 429ac27a0ecSDave Kleikamp if (size > rest) 430ac27a0ecSDave Kleikamp return -ERANGE; 431764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 432764a5c6bSAndreas Gruenbacher buffer += prefix_len; 433764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 434764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 435764a5c6bSAndreas Gruenbacher *buffer++ = 0; 436ac27a0ecSDave Kleikamp } 437ac27a0ecSDave Kleikamp rest -= size; 438ac27a0ecSDave Kleikamp } 439ac27a0ecSDave Kleikamp } 440764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 441ac27a0ecSDave Kleikamp } 442ac27a0ecSDave Kleikamp 443ac27a0ecSDave Kleikamp static int 444431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 445ac27a0ecSDave Kleikamp { 4462b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 447ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 448ac27a0ecSDave Kleikamp int error; 4497a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 450ac27a0ecSDave Kleikamp 451ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 452ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 453ac27a0ecSDave Kleikamp 454ac27a0ecSDave Kleikamp error = 0; 455617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 456ac27a0ecSDave Kleikamp goto cleanup; 457ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 458ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 459617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 460ac27a0ecSDave Kleikamp error = -EIO; 461ac27a0ecSDave Kleikamp if (!bh) 462ac27a0ecSDave Kleikamp goto cleanup; 463ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 464ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 465cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 46624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 467617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 4686a797d27SDarrick J. Wong error = -EFSCORRUPTED; 469ac27a0ecSDave Kleikamp goto cleanup; 470ac27a0ecSDave Kleikamp } 4719c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, bh); 472431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); 473ac27a0ecSDave Kleikamp 474ac27a0ecSDave Kleikamp cleanup: 475ac27a0ecSDave Kleikamp brelse(bh); 476ac27a0ecSDave Kleikamp 477ac27a0ecSDave Kleikamp return error; 478ac27a0ecSDave Kleikamp } 479ac27a0ecSDave Kleikamp 480ac27a0ecSDave Kleikamp static int 481431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 482ac27a0ecSDave Kleikamp { 4832b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 484617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 485617ba13bSMingming Cao struct ext4_inode *raw_inode; 486617ba13bSMingming Cao struct ext4_iloc iloc; 487ac27a0ecSDave Kleikamp void *end; 488ac27a0ecSDave Kleikamp int error; 489ac27a0ecSDave Kleikamp 49019f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 491ac27a0ecSDave Kleikamp return 0; 492617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 493ac27a0ecSDave Kleikamp if (error) 494ac27a0ecSDave Kleikamp return error; 495617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 496ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 497617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 4989e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 499ac27a0ecSDave Kleikamp if (error) 500ac27a0ecSDave Kleikamp goto cleanup; 501431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 502ac27a0ecSDave Kleikamp buffer, buffer_size); 503ac27a0ecSDave Kleikamp 504ac27a0ecSDave Kleikamp cleanup: 505ac27a0ecSDave Kleikamp brelse(iloc.bh); 506ac27a0ecSDave Kleikamp return error; 507ac27a0ecSDave Kleikamp } 508ac27a0ecSDave Kleikamp 509ac27a0ecSDave Kleikamp /* 510617ba13bSMingming Cao * ext4_xattr_list() 511ac27a0ecSDave Kleikamp * 512ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 513ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 514ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 515ac27a0ecSDave Kleikamp * 516ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 517ac27a0ecSDave Kleikamp * used / required on success. 518ac27a0ecSDave Kleikamp */ 519d3a95d47SMingming Cao static int 520431547b3SChristoph Hellwig ext4_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size) 521ac27a0ecSDave Kleikamp { 522eaeef867STheodore Ts'o int ret, ret2; 523ac27a0ecSDave Kleikamp 5242b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 525eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 526eaeef867STheodore Ts'o if (ret < 0) 527eaeef867STheodore Ts'o goto errout; 528ac27a0ecSDave Kleikamp if (buffer) { 529eaeef867STheodore Ts'o buffer += ret; 530eaeef867STheodore Ts'o buffer_size -= ret; 531ac27a0ecSDave Kleikamp } 532eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 533eaeef867STheodore Ts'o if (ret < 0) 534eaeef867STheodore Ts'o goto errout; 535eaeef867STheodore Ts'o ret += ret2; 536eaeef867STheodore Ts'o errout: 5372b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 538eaeef867STheodore Ts'o return ret; 539ac27a0ecSDave Kleikamp } 540ac27a0ecSDave Kleikamp 541ac27a0ecSDave Kleikamp /* 542617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 543ac27a0ecSDave Kleikamp * not set, set it. 544ac27a0ecSDave Kleikamp */ 545617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 546ac27a0ecSDave Kleikamp struct super_block *sb) 547ac27a0ecSDave Kleikamp { 548e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 549ac27a0ecSDave Kleikamp return; 550ac27a0ecSDave Kleikamp 5515d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 552617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 553e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 554a0375156STheodore Ts'o ext4_handle_dirty_super(handle, sb); 555ac27a0ecSDave Kleikamp } 556ac27a0ecSDave Kleikamp } 557ac27a0ecSDave Kleikamp 558ac27a0ecSDave Kleikamp /* 559ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 560ec4cb1aaSJan Kara * otherwise free the block. 561ac27a0ecSDave Kleikamp */ 562ac27a0ecSDave Kleikamp static void 563617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 564ac27a0ecSDave Kleikamp struct buffer_head *bh) 565ac27a0ecSDave Kleikamp { 5666048c64bSAndreas Gruenbacher struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 5676048c64bSAndreas Gruenbacher u32 hash, ref; 5688a2bfdcbSMingming Cao int error = 0; 569ac27a0ecSDave Kleikamp 5705d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 5718a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 5728a2bfdcbSMingming Cao if (error) 5738a2bfdcbSMingming Cao goto out; 5748a2bfdcbSMingming Cao 5758a2bfdcbSMingming Cao lock_buffer(bh); 5766048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 5776048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 5786048c64bSAndreas Gruenbacher if (ref == 1) { 579ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 58082939d79SJan Kara /* 58182939d79SJan Kara * This must happen under buffer lock for 58282939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 58382939d79SJan Kara */ 5846048c64bSAndreas Gruenbacher mb_cache_entry_delete_block(ext4_mb_cache, hash, bh->b_blocknr); 585ac27a0ecSDave Kleikamp get_bh(bh); 586ec4cb1aaSJan Kara unlock_buffer(bh); 587e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 588e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 589e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 590ac27a0ecSDave Kleikamp } else { 5916048c64bSAndreas Gruenbacher ref--; 5926048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 5936048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 5946048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 5956048c64bSAndreas Gruenbacher 5966048c64bSAndreas Gruenbacher ce = mb_cache_entry_get(ext4_mb_cache, hash, 5976048c64bSAndreas Gruenbacher bh->b_blocknr); 5986048c64bSAndreas Gruenbacher if (ce) { 5996048c64bSAndreas Gruenbacher ce->e_reusable = 1; 6006048c64bSAndreas Gruenbacher mb_cache_entry_put(ext4_mb_cache, ce); 6016048c64bSAndreas Gruenbacher } 6026048c64bSAndreas Gruenbacher } 6036048c64bSAndreas Gruenbacher 604ec4cb1aaSJan Kara /* 605ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 606ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 607ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 608ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 609ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 610ec4cb1aaSJan Kara * call ext4_handle_dirty_xattr_block() with locked buffer as 611ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 612ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 613ec4cb1aaSJan Kara */ 614ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 615ec4cb1aaSJan Kara error = ext4_handle_dirty_xattr_block(handle, inode, 616ec4cb1aaSJan Kara bh); 617c1bb05a6SEric Sandeen unlock_buffer(bh); 618ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 619ec4cb1aaSJan Kara error = ext4_handle_dirty_xattr_block(handle, inode, 620ec4cb1aaSJan Kara bh); 621ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 6220390131bSFrank Mayhar ext4_handle_sync(handle); 6231231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 624ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 625ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 626ac27a0ecSDave Kleikamp } 6278a2bfdcbSMingming Cao out: 6288a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 6298a2bfdcbSMingming Cao return; 630ac27a0ecSDave Kleikamp } 631ac27a0ecSDave Kleikamp 6326dd4ee7cSKalpak Shah /* 6336dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 6346dd4ee7cSKalpak Shah * bytes used by EA entries. 6356dd4ee7cSKalpak Shah */ 6366dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 6376dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 6386dd4ee7cSKalpak Shah { 6396dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 6401cba4237SJan Kara if (last->e_value_size) { 6416dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 6426dd4ee7cSKalpak Shah if (offs < *min_offs) 6436dd4ee7cSKalpak Shah *min_offs = offs; 6446dd4ee7cSKalpak Shah } 6457b1b2c1bSTheodore Ts'o if (total) 6467b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 6476dd4ee7cSKalpak Shah } 6486dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 6496dd4ee7cSKalpak Shah } 6506dd4ee7cSKalpak Shah 651ac27a0ecSDave Kleikamp static int 652617ba13bSMingming Cao ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s) 653ac27a0ecSDave Kleikamp { 654617ba13bSMingming Cao struct ext4_xattr_entry *last; 655ac27a0ecSDave Kleikamp size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); 656ac27a0ecSDave Kleikamp 657ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 658ac27a0ecSDave Kleikamp last = s->first; 659617ba13bSMingming Cao for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 6601cba4237SJan Kara if (last->e_value_size) { 661ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 662ac27a0ecSDave Kleikamp if (offs < min_offs) 663ac27a0ecSDave Kleikamp min_offs = offs; 664ac27a0ecSDave Kleikamp } 665ac27a0ecSDave Kleikamp } 666ac27a0ecSDave Kleikamp free = min_offs - ((void *)last - s->base) - sizeof(__u32); 667ac27a0ecSDave Kleikamp if (!s->not_found) { 6681cba4237SJan Kara if (s->here->e_value_size) { 669ac27a0ecSDave Kleikamp size_t size = le32_to_cpu(s->here->e_value_size); 670617ba13bSMingming Cao free += EXT4_XATTR_SIZE(size); 671ac27a0ecSDave Kleikamp } 672617ba13bSMingming Cao free += EXT4_XATTR_LEN(name_len); 673ac27a0ecSDave Kleikamp } 674ac27a0ecSDave Kleikamp if (i->value) { 6755f80f62aSWei Yuan if (free < EXT4_XATTR_LEN(name_len) + 676617ba13bSMingming Cao EXT4_XATTR_SIZE(i->value_len)) 677ac27a0ecSDave Kleikamp return -ENOSPC; 678ac27a0ecSDave Kleikamp } 679ac27a0ecSDave Kleikamp 680ac27a0ecSDave Kleikamp if (i->value && s->not_found) { 681ac27a0ecSDave Kleikamp /* Insert the new name. */ 682617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 683ac27a0ecSDave Kleikamp size_t rest = (void *)last - (void *)s->here + sizeof(__u32); 684ac27a0ecSDave Kleikamp memmove((void *)s->here + size, s->here, rest); 685ac27a0ecSDave Kleikamp memset(s->here, 0, size); 686ac27a0ecSDave Kleikamp s->here->e_name_index = i->name_index; 687ac27a0ecSDave Kleikamp s->here->e_name_len = name_len; 688ac27a0ecSDave Kleikamp memcpy(s->here->e_name, i->name, name_len); 689ac27a0ecSDave Kleikamp } else { 6901cba4237SJan Kara if (s->here->e_value_size) { 691ac27a0ecSDave Kleikamp void *first_val = s->base + min_offs; 692ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(s->here->e_value_offs); 693ac27a0ecSDave Kleikamp void *val = s->base + offs; 694617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE( 695ac27a0ecSDave Kleikamp le32_to_cpu(s->here->e_value_size)); 696ac27a0ecSDave Kleikamp 697617ba13bSMingming Cao if (i->value && size == EXT4_XATTR_SIZE(i->value_len)) { 698ac27a0ecSDave Kleikamp /* The old and the new value have the same 699ac27a0ecSDave Kleikamp size. Just replace. */ 700ac27a0ecSDave Kleikamp s->here->e_value_size = 701ac27a0ecSDave Kleikamp cpu_to_le32(i->value_len); 702bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 703bd9926e8STheodore Ts'o memset(val, 0, size); 704bd9926e8STheodore Ts'o } else { 705bd9926e8STheodore Ts'o /* Clear pad bytes first. */ 706617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 707bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 708ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 709bd9926e8STheodore Ts'o } 710ac27a0ecSDave Kleikamp return 0; 711ac27a0ecSDave Kleikamp } 712ac27a0ecSDave Kleikamp 713ac27a0ecSDave Kleikamp /* Remove the old value. */ 714ac27a0ecSDave Kleikamp memmove(first_val + size, first_val, val - first_val); 715ac27a0ecSDave Kleikamp memset(first_val, 0, size); 716ac27a0ecSDave Kleikamp s->here->e_value_size = 0; 717ac27a0ecSDave Kleikamp s->here->e_value_offs = 0; 718ac27a0ecSDave Kleikamp min_offs += size; 719ac27a0ecSDave Kleikamp 720ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 721ac27a0ecSDave Kleikamp last = s->first; 722ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 723ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 7241cba4237SJan Kara if (last->e_value_size && o < offs) 725ac27a0ecSDave Kleikamp last->e_value_offs = 726ac27a0ecSDave Kleikamp cpu_to_le16(o + size); 727617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 728ac27a0ecSDave Kleikamp } 729ac27a0ecSDave Kleikamp } 730ac27a0ecSDave Kleikamp if (!i->value) { 731ac27a0ecSDave Kleikamp /* Remove the old name. */ 732617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 733ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 734ac27a0ecSDave Kleikamp memmove(s->here, (void *)s->here + size, 735ac27a0ecSDave Kleikamp (void *)last - (void *)s->here + sizeof(__u32)); 736ac27a0ecSDave Kleikamp memset(last, 0, size); 737ac27a0ecSDave Kleikamp } 738ac27a0ecSDave Kleikamp } 739ac27a0ecSDave Kleikamp 740ac27a0ecSDave Kleikamp if (i->value) { 741ac27a0ecSDave Kleikamp /* Insert the new value. */ 742ac27a0ecSDave Kleikamp s->here->e_value_size = cpu_to_le32(i->value_len); 743ac27a0ecSDave Kleikamp if (i->value_len) { 744617ba13bSMingming Cao size_t size = EXT4_XATTR_SIZE(i->value_len); 745ac27a0ecSDave Kleikamp void *val = s->base + min_offs - size; 746ac27a0ecSDave Kleikamp s->here->e_value_offs = cpu_to_le16(min_offs - size); 747bd9926e8STheodore Ts'o if (i->value == EXT4_ZERO_XATTR_VALUE) { 748bd9926e8STheodore Ts'o memset(val, 0, size); 749bd9926e8STheodore Ts'o } else { 750bd9926e8STheodore Ts'o /* Clear the pad bytes first. */ 751617ba13bSMingming Cao memset(val + size - EXT4_XATTR_PAD, 0, 752bd9926e8STheodore Ts'o EXT4_XATTR_PAD); 753ac27a0ecSDave Kleikamp memcpy(val, i->value, i->value_len); 754ac27a0ecSDave Kleikamp } 755ac27a0ecSDave Kleikamp } 756bd9926e8STheodore Ts'o } 757ac27a0ecSDave Kleikamp return 0; 758ac27a0ecSDave Kleikamp } 759ac27a0ecSDave Kleikamp 760617ba13bSMingming Cao struct ext4_xattr_block_find { 761617ba13bSMingming Cao struct ext4_xattr_search s; 762ac27a0ecSDave Kleikamp struct buffer_head *bh; 763ac27a0ecSDave Kleikamp }; 764ac27a0ecSDave Kleikamp 765ac27a0ecSDave Kleikamp static int 766617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 767617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 768ac27a0ecSDave Kleikamp { 769ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 770ac27a0ecSDave Kleikamp int error; 771ac27a0ecSDave Kleikamp 772ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 773ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 774ac27a0ecSDave Kleikamp 775617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 776ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 777617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 778ac27a0ecSDave Kleikamp error = -EIO; 779ac27a0ecSDave Kleikamp if (!bs->bh) 780ac27a0ecSDave Kleikamp goto cleanup; 781ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 782ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 783ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 784cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bs->bh)) { 78524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 78624676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 7876a797d27SDarrick J. Wong error = -EFSCORRUPTED; 788ac27a0ecSDave Kleikamp goto cleanup; 789ac27a0ecSDave Kleikamp } 790ac27a0ecSDave Kleikamp /* Find the named attribute. */ 791ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 792ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 793ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 794ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 795617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 796ac27a0ecSDave Kleikamp i->name, bs->bh->b_size, 1); 797ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 798ac27a0ecSDave Kleikamp goto cleanup; 799ac27a0ecSDave Kleikamp bs->s.not_found = error; 800ac27a0ecSDave Kleikamp } 801ac27a0ecSDave Kleikamp error = 0; 802ac27a0ecSDave Kleikamp 803ac27a0ecSDave Kleikamp cleanup: 804ac27a0ecSDave Kleikamp return error; 805ac27a0ecSDave Kleikamp } 806ac27a0ecSDave Kleikamp 807ac27a0ecSDave Kleikamp static int 808617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 809617ba13bSMingming Cao struct ext4_xattr_info *i, 810617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 811ac27a0ecSDave Kleikamp { 812ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 813ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 814617ba13bSMingming Cao struct ext4_xattr_search *s = &bs->s; 8157a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 8168a2bfdcbSMingming Cao int error = 0; 8177a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 818ac27a0ecSDave Kleikamp 819617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 820ac27a0ecSDave Kleikamp 821ac27a0ecSDave Kleikamp if (i->value && i->value_len > sb->s_blocksize) 822ac27a0ecSDave Kleikamp return -ENOSPC; 823ac27a0ecSDave Kleikamp if (s->base) { 8245d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 8258a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 8268a2bfdcbSMingming Cao if (error) 8278a2bfdcbSMingming Cao goto cleanup; 8288a2bfdcbSMingming Cao lock_buffer(bs->bh); 8298a2bfdcbSMingming Cao 830ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 83182939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 83282939d79SJan Kara 83382939d79SJan Kara /* 83482939d79SJan Kara * This must happen under buffer lock for 83582939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 83682939d79SJan Kara * block 83782939d79SJan Kara */ 8387a2508e1SJan Kara mb_cache_entry_delete_block(ext4_mb_cache, hash, 83982939d79SJan Kara bs->bh->b_blocknr); 840ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 841617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 842ac27a0ecSDave Kleikamp if (!error) { 843ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 844617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), 845ac27a0ecSDave Kleikamp s->here); 8469c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, 8479c191f70ST Makphaibulchoke bs->bh); 848ac27a0ecSDave Kleikamp } 849ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 8506a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 851ac27a0ecSDave Kleikamp goto bad_block; 852ac27a0ecSDave Kleikamp if (!error) 853cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 8540390131bSFrank Mayhar inode, 855ac27a0ecSDave Kleikamp bs->bh); 856ac27a0ecSDave Kleikamp if (error) 857ac27a0ecSDave Kleikamp goto cleanup; 858ac27a0ecSDave Kleikamp goto inserted; 859ac27a0ecSDave Kleikamp } else { 860ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 861ac27a0ecSDave Kleikamp 8628a2bfdcbSMingming Cao unlock_buffer(bs->bh); 863ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 864216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 865ac27a0ecSDave Kleikamp error = -ENOMEM; 866ac27a0ecSDave Kleikamp if (s->base == NULL) 867ac27a0ecSDave Kleikamp goto cleanup; 868ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 869ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 870ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 871ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 872ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 873ac27a0ecSDave Kleikamp } 874ac27a0ecSDave Kleikamp } else { 875ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 876216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 877ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 878ac27a0ecSDave Kleikamp error = -ENOMEM; 879ac27a0ecSDave Kleikamp if (s->base == NULL) 880ac27a0ecSDave Kleikamp goto cleanup; 881617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 882ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 883ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 884ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 885ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 886ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 887ac27a0ecSDave Kleikamp } 888ac27a0ecSDave Kleikamp 889617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 8906a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 891ac27a0ecSDave Kleikamp goto bad_block; 892ac27a0ecSDave Kleikamp if (error) 893ac27a0ecSDave Kleikamp goto cleanup; 894ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) 895617ba13bSMingming Cao ext4_xattr_rehash(header(s->base), s->here); 896ac27a0ecSDave Kleikamp 897ac27a0ecSDave Kleikamp inserted: 898ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 899617ba13bSMingming Cao new_bh = ext4_xattr_cache_find(inode, header(s->base), &ce); 900ac27a0ecSDave Kleikamp if (new_bh) { 901ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 902ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 903ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 904ac27a0ecSDave Kleikamp else { 9056048c64bSAndreas Gruenbacher u32 ref; 9066048c64bSAndreas Gruenbacher 907ac27a0ecSDave Kleikamp /* The old block is released after updating 908ac27a0ecSDave Kleikamp the inode. */ 9091231b3a1SLukas Czerner error = dquot_alloc_block(inode, 9101231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 9115dd4056dSChristoph Hellwig if (error) 912ac27a0ecSDave Kleikamp goto cleanup; 9135d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 914617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 915ac27a0ecSDave Kleikamp new_bh); 916ac27a0ecSDave Kleikamp if (error) 917ac27a0ecSDave Kleikamp goto cleanup_dquot; 918ac27a0ecSDave Kleikamp lock_buffer(new_bh); 91982939d79SJan Kara /* 92082939d79SJan Kara * We have to be careful about races with 9216048c64bSAndreas Gruenbacher * freeing, rehashing or adding references to 9226048c64bSAndreas Gruenbacher * xattr block. Once we hold buffer lock xattr 9236048c64bSAndreas Gruenbacher * block's state is stable so we can check 9246048c64bSAndreas Gruenbacher * whether the block got freed / rehashed or 9256048c64bSAndreas Gruenbacher * not. Since we unhash mbcache entry under 9266048c64bSAndreas Gruenbacher * buffer lock when freeing / rehashing xattr 9276048c64bSAndreas Gruenbacher * block, checking whether entry is still 9286048c64bSAndreas Gruenbacher * hashed is reliable. Same rules hold for 9296048c64bSAndreas Gruenbacher * e_reusable handling. 93082939d79SJan Kara */ 9316048c64bSAndreas Gruenbacher if (hlist_bl_unhashed(&ce->e_hash_list) || 9326048c64bSAndreas Gruenbacher !ce->e_reusable) { 93382939d79SJan Kara /* 93482939d79SJan Kara * Undo everything and check mbcache 93582939d79SJan Kara * again. 93682939d79SJan Kara */ 93782939d79SJan Kara unlock_buffer(new_bh); 93882939d79SJan Kara dquot_free_block(inode, 93982939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 94082939d79SJan Kara 1)); 94182939d79SJan Kara brelse(new_bh); 9427a2508e1SJan Kara mb_cache_entry_put(ext4_mb_cache, ce); 94382939d79SJan Kara ce = NULL; 94482939d79SJan Kara new_bh = NULL; 94582939d79SJan Kara goto inserted; 94682939d79SJan Kara } 9476048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 9486048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 9496048c64bSAndreas Gruenbacher if (ref >= EXT4_XATTR_REFCOUNT_MAX) 9506048c64bSAndreas Gruenbacher ce->e_reusable = 0; 951ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 9526048c64bSAndreas Gruenbacher ref); 953ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 954cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 9550390131bSFrank Mayhar inode, 956ac27a0ecSDave Kleikamp new_bh); 957ac27a0ecSDave Kleikamp if (error) 958ac27a0ecSDave Kleikamp goto cleanup_dquot; 959ac27a0ecSDave Kleikamp } 9607a2508e1SJan Kara mb_cache_entry_touch(ext4_mb_cache, ce); 9617a2508e1SJan Kara mb_cache_entry_put(ext4_mb_cache, ce); 962ac27a0ecSDave Kleikamp ce = NULL; 963ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 964ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 965ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 966ac27a0ecSDave Kleikamp new_bh = bs->bh; 967ac27a0ecSDave Kleikamp get_bh(new_bh); 968ac27a0ecSDave Kleikamp } else { 969ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 970fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 971fb0a387dSEric Sandeen 972fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 973d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 974fb0a387dSEric Sandeen 975fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 97612e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 977fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 978fb0a387dSEric Sandeen 97955f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 98055f020dbSAllison Henderson NULL, &error); 981ac27a0ecSDave Kleikamp if (error) 982ac27a0ecSDave Kleikamp goto cleanup; 983fb0a387dSEric Sandeen 98412e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 985fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 986fb0a387dSEric Sandeen 987ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 988ace36ad4SJoe Perches (unsigned long long)block); 989ac27a0ecSDave Kleikamp 990ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 991aebf0243SWang Shilong if (unlikely(!new_bh)) { 992860d21e2STheodore Ts'o error = -ENOMEM; 993ac27a0ecSDave Kleikamp getblk_failed: 9947dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 995e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 996ac27a0ecSDave Kleikamp goto cleanup; 997ac27a0ecSDave Kleikamp } 998ac27a0ecSDave Kleikamp lock_buffer(new_bh); 999617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 1000ac27a0ecSDave Kleikamp if (error) { 1001ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 1002860d21e2STheodore Ts'o error = -EIO; 1003ac27a0ecSDave Kleikamp goto getblk_failed; 1004ac27a0ecSDave Kleikamp } 1005ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 1006ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 1007ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 10089c191f70ST Makphaibulchoke ext4_xattr_cache_insert(ext4_mb_cache, new_bh); 1009cc8e94fdSDarrick J. Wong error = ext4_handle_dirty_xattr_block(handle, 10100390131bSFrank Mayhar inode, new_bh); 1011ac27a0ecSDave Kleikamp if (error) 1012ac27a0ecSDave Kleikamp goto cleanup; 1013ac27a0ecSDave Kleikamp } 1014ac27a0ecSDave Kleikamp } 1015ac27a0ecSDave Kleikamp 1016ac27a0ecSDave Kleikamp /* Update the inode. */ 1017617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 1018ac27a0ecSDave Kleikamp 1019ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 1020ac27a0ecSDave Kleikamp if (bs->bh && bs->bh != new_bh) 1021617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bs->bh); 1022ac27a0ecSDave Kleikamp error = 0; 1023ac27a0ecSDave Kleikamp 1024ac27a0ecSDave Kleikamp cleanup: 1025ac27a0ecSDave Kleikamp if (ce) 10267a2508e1SJan Kara mb_cache_entry_put(ext4_mb_cache, ce); 1027ac27a0ecSDave Kleikamp brelse(new_bh); 1028ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 1029ac27a0ecSDave Kleikamp kfree(s->base); 1030ac27a0ecSDave Kleikamp 1031ac27a0ecSDave Kleikamp return error; 1032ac27a0ecSDave Kleikamp 1033ac27a0ecSDave Kleikamp cleanup_dquot: 10341231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 1035ac27a0ecSDave Kleikamp goto cleanup; 1036ac27a0ecSDave Kleikamp 1037ac27a0ecSDave Kleikamp bad_block: 103824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 103924676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1040ac27a0ecSDave Kleikamp goto cleanup; 1041ac27a0ecSDave Kleikamp 1042ac27a0ecSDave Kleikamp #undef header 1043ac27a0ecSDave Kleikamp } 1044ac27a0ecSDave Kleikamp 1045879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 1046617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 1047ac27a0ecSDave Kleikamp { 1048617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 1049617ba13bSMingming Cao struct ext4_inode *raw_inode; 1050ac27a0ecSDave Kleikamp int error; 1051ac27a0ecSDave Kleikamp 1052617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 1053ac27a0ecSDave Kleikamp return 0; 1054617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 1055ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 1056ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 1057ac27a0ecSDave Kleikamp is->s.here = is->s.first; 1058617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 105919f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 10609e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 1061ac27a0ecSDave Kleikamp if (error) 1062ac27a0ecSDave Kleikamp return error; 1063ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1064617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 1065ac27a0ecSDave Kleikamp i->name, is->s.end - 1066ac27a0ecSDave Kleikamp (void *)is->s.base, 0); 1067ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1068ac27a0ecSDave Kleikamp return error; 1069ac27a0ecSDave Kleikamp is->s.not_found = error; 1070ac27a0ecSDave Kleikamp } 1071ac27a0ecSDave Kleikamp return 0; 1072ac27a0ecSDave Kleikamp } 1073ac27a0ecSDave Kleikamp 10740d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 10750d812f77STao Ma struct ext4_xattr_info *i, 10760d812f77STao Ma struct ext4_xattr_ibody_find *is) 10770d812f77STao Ma { 10780d812f77STao Ma struct ext4_xattr_ibody_header *header; 10790d812f77STao Ma struct ext4_xattr_search *s = &is->s; 10800d812f77STao Ma int error; 10810d812f77STao Ma 10820d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 10830d812f77STao Ma return -ENOSPC; 10840d812f77STao Ma error = ext4_xattr_set_entry(i, s); 10850d812f77STao Ma if (error) { 10860d812f77STao Ma if (error == -ENOSPC && 10870d812f77STao Ma ext4_has_inline_data(inode)) { 10880d812f77STao Ma error = ext4_try_to_evict_inline_data(handle, inode, 10890d812f77STao Ma EXT4_XATTR_LEN(strlen(i->name) + 10900d812f77STao Ma EXT4_XATTR_SIZE(i->value_len))); 10910d812f77STao Ma if (error) 10920d812f77STao Ma return error; 10930d812f77STao Ma error = ext4_xattr_ibody_find(inode, i, is); 10940d812f77STao Ma if (error) 10950d812f77STao Ma return error; 10960d812f77STao Ma error = ext4_xattr_set_entry(i, s); 10970d812f77STao Ma } 10980d812f77STao Ma if (error) 10990d812f77STao Ma return error; 11000d812f77STao Ma } 11010d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 11020d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 11030d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 11040d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 11050d812f77STao Ma } else { 11060d812f77STao Ma header->h_magic = cpu_to_le32(0); 11070d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 11080d812f77STao Ma } 11090d812f77STao Ma return 0; 11100d812f77STao Ma } 11110d812f77STao Ma 11120d812f77STao Ma static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 1113617ba13bSMingming Cao struct ext4_xattr_info *i, 1114617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 1115ac27a0ecSDave Kleikamp { 1116617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 1117617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 1118ac27a0ecSDave Kleikamp int error; 1119ac27a0ecSDave Kleikamp 1120617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 1121ac27a0ecSDave Kleikamp return -ENOSPC; 1122617ba13bSMingming Cao error = ext4_xattr_set_entry(i, s); 1123ac27a0ecSDave Kleikamp if (error) 1124ac27a0ecSDave Kleikamp return error; 1125617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 1126ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 1127617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 112819f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 1129ac27a0ecSDave Kleikamp } else { 1130ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 113119f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 1132ac27a0ecSDave Kleikamp } 1133ac27a0ecSDave Kleikamp return 0; 1134ac27a0ecSDave Kleikamp } 1135ac27a0ecSDave Kleikamp 11363fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 11373fd16462SJan Kara struct ext4_xattr_info *i) 11383fd16462SJan Kara { 11393fd16462SJan Kara void *value; 11403fd16462SJan Kara 11413fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 11423fd16462SJan Kara return 0; 11433fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 11443fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 11453fd16462SJan Kara } 11463fd16462SJan Kara 1147ac27a0ecSDave Kleikamp /* 1148617ba13bSMingming Cao * ext4_xattr_set_handle() 1149ac27a0ecSDave Kleikamp * 11506e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 1151ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 1152ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 1153ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 1154ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 1155ac27a0ecSDave Kleikamp * previous to the call, respectively. 1156ac27a0ecSDave Kleikamp * 1157ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1158ac27a0ecSDave Kleikamp */ 1159ac27a0ecSDave Kleikamp int 1160617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 1161ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 1162ac27a0ecSDave Kleikamp int flags) 1163ac27a0ecSDave Kleikamp { 1164617ba13bSMingming Cao struct ext4_xattr_info i = { 1165ac27a0ecSDave Kleikamp .name_index = name_index, 1166ac27a0ecSDave Kleikamp .name = name, 1167ac27a0ecSDave Kleikamp .value = value, 1168ac27a0ecSDave Kleikamp .value_len = value_len, 1169ac27a0ecSDave Kleikamp 1170ac27a0ecSDave Kleikamp }; 1171617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 1172ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1173ac27a0ecSDave Kleikamp }; 1174617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 1175ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 1176ac27a0ecSDave Kleikamp }; 11774d20c685SKalpak Shah unsigned long no_expand; 1178ac27a0ecSDave Kleikamp int error; 1179ac27a0ecSDave Kleikamp 1180ac27a0ecSDave Kleikamp if (!name) 1181ac27a0ecSDave Kleikamp return -EINVAL; 1182ac27a0ecSDave Kleikamp if (strlen(name) > 255) 1183ac27a0ecSDave Kleikamp return -ERANGE; 1184617ba13bSMingming Cao down_write(&EXT4_I(inode)->xattr_sem); 118519f5fb7aSTheodore Ts'o no_expand = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND); 118619f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND); 11874d20c685SKalpak Shah 118866543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 118986ebfd08SEric Sandeen if (error) 119086ebfd08SEric Sandeen goto cleanup; 119186ebfd08SEric Sandeen 119219f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 1193617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 1194617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 119519f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 1196ac27a0ecSDave Kleikamp } 1197ac27a0ecSDave Kleikamp 1198617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 1199ac27a0ecSDave Kleikamp if (error) 1200ac27a0ecSDave Kleikamp goto cleanup; 1201ac27a0ecSDave Kleikamp if (is.s.not_found) 1202617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 1203ac27a0ecSDave Kleikamp if (error) 1204ac27a0ecSDave Kleikamp goto cleanup; 1205ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 1206ac27a0ecSDave Kleikamp error = -ENODATA; 1207ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 1208ac27a0ecSDave Kleikamp goto cleanup; 1209ac27a0ecSDave Kleikamp error = 0; 1210ac27a0ecSDave Kleikamp if (!value) 1211ac27a0ecSDave Kleikamp goto cleanup; 1212ac27a0ecSDave Kleikamp } else { 1213ac27a0ecSDave Kleikamp error = -EEXIST; 1214ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 1215ac27a0ecSDave Kleikamp goto cleanup; 1216ac27a0ecSDave Kleikamp } 1217ac27a0ecSDave Kleikamp if (!value) { 1218ac27a0ecSDave Kleikamp if (!is.s.not_found) 1219617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1220ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 1221617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1222ac27a0ecSDave Kleikamp } else { 12233fd16462SJan Kara error = 0; 12243fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 12253fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 12263fd16462SJan Kara goto cleanup; 12273fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 12283fd16462SJan Kara goto cleanup; 12293fd16462SJan Kara 1230617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, &is); 1231ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 1232ac27a0ecSDave Kleikamp i.value = NULL; 1233617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1234ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 12357e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 12367e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 12377e01c8e5STiger Yang if (error) 12387e01c8e5STiger Yang goto cleanup; 12397e01c8e5STiger Yang } 1240617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 1241ac27a0ecSDave Kleikamp if (error) 1242ac27a0ecSDave Kleikamp goto cleanup; 1243ac27a0ecSDave Kleikamp if (!is.s.not_found) { 1244ac27a0ecSDave Kleikamp i.value = NULL; 1245617ba13bSMingming Cao error = ext4_xattr_ibody_set(handle, inode, &i, 1246ac27a0ecSDave Kleikamp &is); 1247ac27a0ecSDave Kleikamp } 1248ac27a0ecSDave Kleikamp } 1249ac27a0ecSDave Kleikamp } 1250ac27a0ecSDave Kleikamp if (!error) { 1251617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 1252*eeca7ea1SDeepa Dinamani inode->i_ctime = current_time(inode); 12536dd4ee7cSKalpak Shah if (!value) 125419f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); 1255617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 1256ac27a0ecSDave Kleikamp /* 1257617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 1258ac27a0ecSDave Kleikamp * error != 0. 1259ac27a0ecSDave Kleikamp */ 1260ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 1261ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 12620390131bSFrank Mayhar ext4_handle_sync(handle); 1263ac27a0ecSDave Kleikamp } 1264ac27a0ecSDave Kleikamp 1265ac27a0ecSDave Kleikamp cleanup: 1266ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 1267ac27a0ecSDave Kleikamp brelse(bs.bh); 12684d20c685SKalpak Shah if (no_expand == 0) 126919f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); 1270617ba13bSMingming Cao up_write(&EXT4_I(inode)->xattr_sem); 1271ac27a0ecSDave Kleikamp return error; 1272ac27a0ecSDave Kleikamp } 1273ac27a0ecSDave Kleikamp 1274ac27a0ecSDave Kleikamp /* 1275617ba13bSMingming Cao * ext4_xattr_set() 1276ac27a0ecSDave Kleikamp * 1277617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 1278ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 1279ac27a0ecSDave Kleikamp * 1280ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1281ac27a0ecSDave Kleikamp */ 1282ac27a0ecSDave Kleikamp int 1283617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 1284ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 1285ac27a0ecSDave Kleikamp { 1286ac27a0ecSDave Kleikamp handle_t *handle; 1287ac27a0ecSDave Kleikamp int error, retries = 0; 128895eaefbdSTheodore Ts'o int credits = ext4_jbd2_credits_xattr(inode); 1289ac27a0ecSDave Kleikamp 1290ac27a0ecSDave Kleikamp retry: 12919924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 1292ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 1293ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 1294ac27a0ecSDave Kleikamp } else { 1295ac27a0ecSDave Kleikamp int error2; 1296ac27a0ecSDave Kleikamp 1297617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 1298ac27a0ecSDave Kleikamp value, value_len, flags); 1299617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 1300ac27a0ecSDave Kleikamp if (error == -ENOSPC && 1301617ba13bSMingming Cao ext4_should_retry_alloc(inode->i_sb, &retries)) 1302ac27a0ecSDave Kleikamp goto retry; 1303ac27a0ecSDave Kleikamp if (error == 0) 1304ac27a0ecSDave Kleikamp error = error2; 1305ac27a0ecSDave Kleikamp } 1306ac27a0ecSDave Kleikamp 1307ac27a0ecSDave Kleikamp return error; 1308ac27a0ecSDave Kleikamp } 1309ac27a0ecSDave Kleikamp 1310ac27a0ecSDave Kleikamp /* 13116dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 13126dd4ee7cSKalpak Shah * i_extra_isize. 13136dd4ee7cSKalpak Shah */ 13146dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 13156dd4ee7cSKalpak Shah int value_offs_shift, void *to, 131694405713SJan Kara void *from, size_t n) 13176dd4ee7cSKalpak Shah { 13186dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 13196dd4ee7cSKalpak Shah int new_offs; 13206dd4ee7cSKalpak Shah 132194405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 132294405713SJan Kara BUG_ON(value_offs_shift > 0); 132394405713SJan Kara 13246dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 13256dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 13261cba4237SJan Kara if (last->e_value_size) { 13276dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 13286dd4ee7cSKalpak Shah value_offs_shift; 13296dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 13306dd4ee7cSKalpak Shah } 13316dd4ee7cSKalpak Shah } 13326dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 13336dd4ee7cSKalpak Shah memmove(to, from, n); 13346dd4ee7cSKalpak Shah } 13356dd4ee7cSKalpak Shah 13366dd4ee7cSKalpak Shah /* 13373f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 13383f2571c1SJan Kara */ 13393f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 13403f2571c1SJan Kara struct ext4_inode *raw_inode, 13413f2571c1SJan Kara struct ext4_xattr_entry *entry) 13423f2571c1SJan Kara { 13433f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 13443f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 13453f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 13463f2571c1SJan Kara size_t value_offs, value_size; 13473f2571c1SJan Kara struct ext4_xattr_info i = { 13483f2571c1SJan Kara .value = NULL, 13493f2571c1SJan Kara .value_len = 0, 13503f2571c1SJan Kara .name_index = entry->e_name_index, 13513f2571c1SJan Kara }; 13523f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 13533f2571c1SJan Kara int error; 13543f2571c1SJan Kara 13553f2571c1SJan Kara value_offs = le16_to_cpu(entry->e_value_offs); 13563f2571c1SJan Kara value_size = le32_to_cpu(entry->e_value_size); 13573f2571c1SJan Kara 13583f2571c1SJan Kara is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 13593f2571c1SJan Kara bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 13603f2571c1SJan Kara buffer = kmalloc(value_size, GFP_NOFS); 13613f2571c1SJan Kara b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 13623f2571c1SJan Kara if (!is || !bs || !buffer || !b_entry_name) { 13633f2571c1SJan Kara error = -ENOMEM; 13643f2571c1SJan Kara goto out; 13653f2571c1SJan Kara } 13663f2571c1SJan Kara 13673f2571c1SJan Kara is->s.not_found = -ENODATA; 13683f2571c1SJan Kara bs->s.not_found = -ENODATA; 13693f2571c1SJan Kara is->iloc.bh = NULL; 13703f2571c1SJan Kara bs->bh = NULL; 13713f2571c1SJan Kara 13723f2571c1SJan Kara /* Save the entry name and the entry value */ 13733f2571c1SJan Kara memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); 13743f2571c1SJan Kara memcpy(b_entry_name, entry->e_name, entry->e_name_len); 13753f2571c1SJan Kara b_entry_name[entry->e_name_len] = '\0'; 13763f2571c1SJan Kara i.name = b_entry_name; 13773f2571c1SJan Kara 13783f2571c1SJan Kara error = ext4_get_inode_loc(inode, &is->iloc); 13793f2571c1SJan Kara if (error) 13803f2571c1SJan Kara goto out; 13813f2571c1SJan Kara 13823f2571c1SJan Kara error = ext4_xattr_ibody_find(inode, &i, is); 13833f2571c1SJan Kara if (error) 13843f2571c1SJan Kara goto out; 13853f2571c1SJan Kara 13863f2571c1SJan Kara /* Remove the chosen entry from the inode */ 13873f2571c1SJan Kara error = ext4_xattr_ibody_set(handle, inode, &i, is); 13883f2571c1SJan Kara if (error) 13893f2571c1SJan Kara goto out; 13903f2571c1SJan Kara 13913f2571c1SJan Kara i.name = b_entry_name; 13923f2571c1SJan Kara i.value = buffer; 13933f2571c1SJan Kara i.value_len = value_size; 13943f2571c1SJan Kara error = ext4_xattr_block_find(inode, &i, bs); 13953f2571c1SJan Kara if (error) 13963f2571c1SJan Kara goto out; 13973f2571c1SJan Kara 13983f2571c1SJan Kara /* Add entry which was removed from the inode into the block */ 13993f2571c1SJan Kara error = ext4_xattr_block_set(handle, inode, &i, bs); 14003f2571c1SJan Kara if (error) 14013f2571c1SJan Kara goto out; 14023f2571c1SJan Kara error = 0; 14033f2571c1SJan Kara out: 14043f2571c1SJan Kara kfree(b_entry_name); 14053f2571c1SJan Kara kfree(buffer); 14063f2571c1SJan Kara if (is) 14073f2571c1SJan Kara brelse(is->iloc.bh); 14083f2571c1SJan Kara kfree(is); 14093f2571c1SJan Kara kfree(bs); 14103f2571c1SJan Kara 14113f2571c1SJan Kara return error; 14123f2571c1SJan Kara } 14133f2571c1SJan Kara 1414dfa2064bSJan Kara static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, 1415dfa2064bSJan Kara struct ext4_inode *raw_inode, 1416dfa2064bSJan Kara int isize_diff, size_t ifree, 1417dfa2064bSJan Kara size_t bfree, int *total_ino) 1418dfa2064bSJan Kara { 1419dfa2064bSJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 1420dfa2064bSJan Kara struct ext4_xattr_entry *small_entry; 1421dfa2064bSJan Kara struct ext4_xattr_entry *entry; 1422dfa2064bSJan Kara struct ext4_xattr_entry *last; 1423dfa2064bSJan Kara unsigned int entry_size; /* EA entry size */ 1424dfa2064bSJan Kara unsigned int total_size; /* EA entry size + value size */ 1425dfa2064bSJan Kara unsigned int min_total_size; 1426dfa2064bSJan Kara int error; 1427dfa2064bSJan Kara 1428dfa2064bSJan Kara while (isize_diff > ifree) { 1429dfa2064bSJan Kara entry = NULL; 1430dfa2064bSJan Kara small_entry = NULL; 1431dfa2064bSJan Kara min_total_size = ~0U; 1432dfa2064bSJan Kara last = IFIRST(header); 1433dfa2064bSJan Kara /* Find the entry best suited to be pushed into EA block */ 1434dfa2064bSJan Kara for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1435dfa2064bSJan Kara total_size = 1436dfa2064bSJan Kara EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) + 1437dfa2064bSJan Kara EXT4_XATTR_LEN(last->e_name_len); 1438dfa2064bSJan Kara if (total_size <= bfree && 1439dfa2064bSJan Kara total_size < min_total_size) { 1440dfa2064bSJan Kara if (total_size + ifree < isize_diff) { 1441dfa2064bSJan Kara small_entry = last; 1442dfa2064bSJan Kara } else { 1443dfa2064bSJan Kara entry = last; 1444dfa2064bSJan Kara min_total_size = total_size; 1445dfa2064bSJan Kara } 1446dfa2064bSJan Kara } 1447dfa2064bSJan Kara } 1448dfa2064bSJan Kara 1449dfa2064bSJan Kara if (entry == NULL) { 1450dfa2064bSJan Kara if (small_entry == NULL) 1451dfa2064bSJan Kara return -ENOSPC; 1452dfa2064bSJan Kara entry = small_entry; 1453dfa2064bSJan Kara } 1454dfa2064bSJan Kara 1455dfa2064bSJan Kara entry_size = EXT4_XATTR_LEN(entry->e_name_len); 1456dfa2064bSJan Kara total_size = entry_size + 1457dfa2064bSJan Kara EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)); 1458dfa2064bSJan Kara error = ext4_xattr_move_to_block(handle, inode, raw_inode, 1459dfa2064bSJan Kara entry); 1460dfa2064bSJan Kara if (error) 1461dfa2064bSJan Kara return error; 1462dfa2064bSJan Kara 1463dfa2064bSJan Kara *total_ino -= entry_size; 1464dfa2064bSJan Kara ifree += total_size; 1465dfa2064bSJan Kara bfree -= total_size; 1466dfa2064bSJan Kara } 1467dfa2064bSJan Kara 1468dfa2064bSJan Kara return 0; 1469dfa2064bSJan Kara } 1470dfa2064bSJan Kara 14713f2571c1SJan Kara /* 14726dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 14736dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 14746dd4ee7cSKalpak Shah */ 14756dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 14766dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 14776dd4ee7cSKalpak Shah { 14786dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 14796dd4ee7cSKalpak Shah struct buffer_head *bh = NULL; 1480e3014d14SJan Kara size_t min_offs; 1481e3014d14SJan Kara size_t ifree, bfree; 14827b1b2c1bSTheodore Ts'o int total_ino; 14836e0cd088SJan Kara void *base, *end; 1484d0141191SJan Kara int error = 0, tried_min_extra_isize = 0; 1485ac39849dSAneesh Kumar K.V int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); 1486d0141191SJan Kara int isize_diff; /* How much do we need to grow i_extra_isize */ 14876dd4ee7cSKalpak Shah 14886dd4ee7cSKalpak Shah down_write(&EXT4_I(inode)->xattr_sem); 14892e81a4eeSJan Kara /* 14902e81a4eeSJan Kara * Set EXT4_STATE_NO_EXPAND to avoid recursion when marking inode dirty 14912e81a4eeSJan Kara */ 14922e81a4eeSJan Kara ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND); 14936dd4ee7cSKalpak Shah retry: 1494d0141191SJan Kara isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; 14952e81a4eeSJan Kara if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) 14962e81a4eeSJan Kara goto out; 14976dd4ee7cSKalpak Shah 14986dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 14996dd4ee7cSKalpak Shah 15006dd4ee7cSKalpak Shah /* 15016dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 15026dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 15036dd4ee7cSKalpak Shah */ 15046dd4ee7cSKalpak Shah 15056e0cd088SJan Kara base = IFIRST(header); 15066dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 15076dd4ee7cSKalpak Shah min_offs = end - base; 15086dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 15096dd4ee7cSKalpak Shah 15109e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 15119e92f48cSTheodore Ts'o if (error) 15129e92f48cSTheodore Ts'o goto cleanup; 15139e92f48cSTheodore Ts'o 15146e0cd088SJan Kara ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); 1515e3014d14SJan Kara if (ifree >= isize_diff) 1516e3014d14SJan Kara goto shift; 15176dd4ee7cSKalpak Shah 15186dd4ee7cSKalpak Shah /* 15196dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 15206dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 15216dd4ee7cSKalpak Shah */ 15226dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 15236dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 15246dd4ee7cSKalpak Shah error = -EIO; 15256dd4ee7cSKalpak Shah if (!bh) 15266dd4ee7cSKalpak Shah goto cleanup; 1527cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 152824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 152924676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 15306a797d27SDarrick J. Wong error = -EFSCORRUPTED; 15316dd4ee7cSKalpak Shah goto cleanup; 15326dd4ee7cSKalpak Shah } 15336dd4ee7cSKalpak Shah base = BHDR(bh); 15346dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 15356dd4ee7cSKalpak Shah min_offs = end - base; 15366e0cd088SJan Kara bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, 15376e0cd088SJan Kara NULL); 1538e3014d14SJan Kara if (bfree + ifree < isize_diff) { 15396dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 15406dd4ee7cSKalpak Shah tried_min_extra_isize++; 15416dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 15426dd4ee7cSKalpak Shah brelse(bh); 15436dd4ee7cSKalpak Shah goto retry; 15446dd4ee7cSKalpak Shah } 1545dfa2064bSJan Kara error = -ENOSPC; 15466dd4ee7cSKalpak Shah goto cleanup; 15476dd4ee7cSKalpak Shah } 15486dd4ee7cSKalpak Shah } else { 1549e3014d14SJan Kara bfree = inode->i_sb->s_blocksize; 15506dd4ee7cSKalpak Shah } 15516dd4ee7cSKalpak Shah 1552dfa2064bSJan Kara error = ext4_xattr_make_inode_space(handle, inode, raw_inode, 1553dfa2064bSJan Kara isize_diff, ifree, bfree, 1554dfa2064bSJan Kara &total_ino); 1555dfa2064bSJan Kara if (error) { 1556dfa2064bSJan Kara if (error == -ENOSPC && !tried_min_extra_isize && 15576dd4ee7cSKalpak Shah s_min_extra_isize) { 15586dd4ee7cSKalpak Shah tried_min_extra_isize++; 15596dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 1560dcb9917bSTheodore Ts'o brelse(bh); 15616dd4ee7cSKalpak Shah goto retry; 15626dd4ee7cSKalpak Shah } 15636dd4ee7cSKalpak Shah goto cleanup; 15646dd4ee7cSKalpak Shah } 1565e3014d14SJan Kara shift: 1566e3014d14SJan Kara /* Adjust the offsets and shift the remaining entries ahead */ 15676e0cd088SJan Kara ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize 1568e3014d14SJan Kara - new_extra_isize, (void *)raw_inode + 1569e3014d14SJan Kara EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 157094405713SJan Kara (void *)header, total_ino); 1571e3014d14SJan Kara EXT4_I(inode)->i_extra_isize = new_extra_isize; 15726dd4ee7cSKalpak Shah brelse(bh); 15732e81a4eeSJan Kara out: 15742e81a4eeSJan Kara ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND); 15756dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 15766dd4ee7cSKalpak Shah return 0; 15776dd4ee7cSKalpak Shah 15786dd4ee7cSKalpak Shah cleanup: 15796dd4ee7cSKalpak Shah brelse(bh); 15802e81a4eeSJan Kara /* 15812e81a4eeSJan Kara * We deliberately leave EXT4_STATE_NO_EXPAND set here since inode 15822e81a4eeSJan Kara * size expansion failed. 15832e81a4eeSJan Kara */ 15846dd4ee7cSKalpak Shah up_write(&EXT4_I(inode)->xattr_sem); 15856dd4ee7cSKalpak Shah return error; 15866dd4ee7cSKalpak Shah } 15876dd4ee7cSKalpak Shah 15886dd4ee7cSKalpak Shah 15896dd4ee7cSKalpak Shah 15906dd4ee7cSKalpak Shah /* 1591617ba13bSMingming Cao * ext4_xattr_delete_inode() 1592ac27a0ecSDave Kleikamp * 1593ac27a0ecSDave Kleikamp * Free extended attribute resources associated with this inode. This 1594ac27a0ecSDave Kleikamp * is called immediately before an inode is freed. We have exclusive 1595ac27a0ecSDave Kleikamp * access to the inode. 1596ac27a0ecSDave Kleikamp */ 1597ac27a0ecSDave Kleikamp void 1598617ba13bSMingming Cao ext4_xattr_delete_inode(handle_t *handle, struct inode *inode) 1599ac27a0ecSDave Kleikamp { 1600ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 1601ac27a0ecSDave Kleikamp 1602617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 1603ac27a0ecSDave Kleikamp goto cleanup; 1604617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 1605ac27a0ecSDave Kleikamp if (!bh) { 160624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 160724676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1608ac27a0ecSDave Kleikamp goto cleanup; 1609ac27a0ecSDave Kleikamp } 1610617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 1611ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) { 161224676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 161324676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 1614ac27a0ecSDave Kleikamp goto cleanup; 1615ac27a0ecSDave Kleikamp } 1616617ba13bSMingming Cao ext4_xattr_release_block(handle, inode, bh); 1617617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 1618ac27a0ecSDave Kleikamp 1619ac27a0ecSDave Kleikamp cleanup: 1620ac27a0ecSDave Kleikamp brelse(bh); 1621ac27a0ecSDave Kleikamp } 1622ac27a0ecSDave Kleikamp 1623ac27a0ecSDave Kleikamp /* 1624617ba13bSMingming Cao * ext4_xattr_cache_insert() 1625ac27a0ecSDave Kleikamp * 1626ac27a0ecSDave Kleikamp * Create a new entry in the extended attribute cache, and insert 1627ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 1628ac27a0ecSDave Kleikamp * 1629ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 1630ac27a0ecSDave Kleikamp */ 1631ac27a0ecSDave Kleikamp static void 16327a2508e1SJan Kara ext4_xattr_cache_insert(struct mb_cache *ext4_mb_cache, struct buffer_head *bh) 1633ac27a0ecSDave Kleikamp { 16346048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 16356048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 16366048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 16376048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 1638ac27a0ecSDave Kleikamp int error; 1639ac27a0ecSDave Kleikamp 16407a2508e1SJan Kara error = mb_cache_entry_create(ext4_mb_cache, GFP_NOFS, hash, 16416048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 1642ac27a0ecSDave Kleikamp if (error) { 164382939d79SJan Kara if (error == -EBUSY) 1644ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 164582939d79SJan Kara } else 1646ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 1647ac27a0ecSDave Kleikamp } 1648ac27a0ecSDave Kleikamp 1649ac27a0ecSDave Kleikamp /* 1650617ba13bSMingming Cao * ext4_xattr_cmp() 1651ac27a0ecSDave Kleikamp * 1652ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 1653ac27a0ecSDave Kleikamp * 1654ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 1655ac27a0ecSDave Kleikamp * a negative error number on errors. 1656ac27a0ecSDave Kleikamp */ 1657ac27a0ecSDave Kleikamp static int 1658617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 1659617ba13bSMingming Cao struct ext4_xattr_header *header2) 1660ac27a0ecSDave Kleikamp { 1661617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 1662ac27a0ecSDave Kleikamp 1663ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 1664ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 1665ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 1666ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 1667ac27a0ecSDave Kleikamp return 1; 1668ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 1669ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 1670ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 1671ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 1672ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 1673ac27a0ecSDave Kleikamp return 1; 1674ac27a0ecSDave Kleikamp if (entry1->e_value_block != 0 || entry2->e_value_block != 0) 16756a797d27SDarrick J. Wong return -EFSCORRUPTED; 1676ac27a0ecSDave Kleikamp if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 1677ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 1678ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 1679ac27a0ecSDave Kleikamp return 1; 1680ac27a0ecSDave Kleikamp 1681617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 1682617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 1683ac27a0ecSDave Kleikamp } 1684ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 1685ac27a0ecSDave Kleikamp return 1; 1686ac27a0ecSDave Kleikamp return 0; 1687ac27a0ecSDave Kleikamp } 1688ac27a0ecSDave Kleikamp 1689ac27a0ecSDave Kleikamp /* 1690617ba13bSMingming Cao * ext4_xattr_cache_find() 1691ac27a0ecSDave Kleikamp * 1692ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 1693ac27a0ecSDave Kleikamp * 1694ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 1695ac27a0ecSDave Kleikamp * not found or an error occurred. 1696ac27a0ecSDave Kleikamp */ 1697ac27a0ecSDave Kleikamp static struct buffer_head * 1698617ba13bSMingming Cao ext4_xattr_cache_find(struct inode *inode, struct ext4_xattr_header *header, 16997a2508e1SJan Kara struct mb_cache_entry **pce) 1700ac27a0ecSDave Kleikamp { 1701ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 17027a2508e1SJan Kara struct mb_cache_entry *ce; 17037a2508e1SJan Kara struct mb_cache *ext4_mb_cache = EXT4_GET_MB_CACHE(inode); 1704ac27a0ecSDave Kleikamp 1705ac27a0ecSDave Kleikamp if (!header->h_hash) 1706ac27a0ecSDave Kleikamp return NULL; /* never share */ 1707ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 17087a2508e1SJan Kara ce = mb_cache_entry_find_first(ext4_mb_cache, hash); 1709ac27a0ecSDave Kleikamp while (ce) { 1710ac27a0ecSDave Kleikamp struct buffer_head *bh; 1711ac27a0ecSDave Kleikamp 1712ac27a0ecSDave Kleikamp bh = sb_bread(inode->i_sb, ce->e_block); 1713ac27a0ecSDave Kleikamp if (!bh) { 171424676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 171524676da4STheodore Ts'o (unsigned long) ce->e_block); 1716617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 1717ac27a0ecSDave Kleikamp *pce = ce; 1718ac27a0ecSDave Kleikamp return bh; 1719ac27a0ecSDave Kleikamp } 1720ac27a0ecSDave Kleikamp brelse(bh); 17217a2508e1SJan Kara ce = mb_cache_entry_find_next(ext4_mb_cache, ce); 1722ac27a0ecSDave Kleikamp } 1723ac27a0ecSDave Kleikamp return NULL; 1724ac27a0ecSDave Kleikamp } 1725ac27a0ecSDave Kleikamp 1726ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 1727ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 1728ac27a0ecSDave Kleikamp 1729ac27a0ecSDave Kleikamp /* 1730617ba13bSMingming Cao * ext4_xattr_hash_entry() 1731ac27a0ecSDave Kleikamp * 1732ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 1733ac27a0ecSDave Kleikamp */ 1734617ba13bSMingming Cao static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header, 1735617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1736ac27a0ecSDave Kleikamp { 1737ac27a0ecSDave Kleikamp __u32 hash = 0; 1738ac27a0ecSDave Kleikamp char *name = entry->e_name; 1739ac27a0ecSDave Kleikamp int n; 1740ac27a0ecSDave Kleikamp 1741ac27a0ecSDave Kleikamp for (n = 0; n < entry->e_name_len; n++) { 1742ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 1743ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 1744ac27a0ecSDave Kleikamp *name++; 1745ac27a0ecSDave Kleikamp } 1746ac27a0ecSDave Kleikamp 17471cba4237SJan Kara if (entry->e_value_size != 0) { 1748ac27a0ecSDave Kleikamp __le32 *value = (__le32 *)((char *)header + 1749ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs)); 1750ac27a0ecSDave Kleikamp for (n = (le32_to_cpu(entry->e_value_size) + 1751617ba13bSMingming Cao EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { 1752ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 1753ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 1754ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 1755ac27a0ecSDave Kleikamp } 1756ac27a0ecSDave Kleikamp } 1757ac27a0ecSDave Kleikamp entry->e_hash = cpu_to_le32(hash); 1758ac27a0ecSDave Kleikamp } 1759ac27a0ecSDave Kleikamp 1760ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 1761ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 1762ac27a0ecSDave Kleikamp 1763ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 1764ac27a0ecSDave Kleikamp 1765ac27a0ecSDave Kleikamp /* 1766617ba13bSMingming Cao * ext4_xattr_rehash() 1767ac27a0ecSDave Kleikamp * 1768ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 1769ac27a0ecSDave Kleikamp */ 1770617ba13bSMingming Cao static void ext4_xattr_rehash(struct ext4_xattr_header *header, 1771617ba13bSMingming Cao struct ext4_xattr_entry *entry) 1772ac27a0ecSDave Kleikamp { 1773617ba13bSMingming Cao struct ext4_xattr_entry *here; 1774ac27a0ecSDave Kleikamp __u32 hash = 0; 1775ac27a0ecSDave Kleikamp 1776617ba13bSMingming Cao ext4_xattr_hash_entry(header, entry); 1777ac27a0ecSDave Kleikamp here = ENTRY(header+1); 1778ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 1779ac27a0ecSDave Kleikamp if (!here->e_hash) { 1780ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 1781ac27a0ecSDave Kleikamp hash = 0; 1782ac27a0ecSDave Kleikamp break; 1783ac27a0ecSDave Kleikamp } 1784ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 1785ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 1786ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 1787617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 1788ac27a0ecSDave Kleikamp } 1789ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 1790ac27a0ecSDave Kleikamp } 1791ac27a0ecSDave Kleikamp 1792ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 1793ac27a0ecSDave Kleikamp 17949c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 17959c191f70ST Makphaibulchoke 17967a2508e1SJan Kara struct mb_cache * 179782939d79SJan Kara ext4_xattr_create_cache(void) 1798ac27a0ecSDave Kleikamp { 17997a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 1800ac27a0ecSDave Kleikamp } 1801ac27a0ecSDave Kleikamp 18027a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 1803ac27a0ecSDave Kleikamp { 18049c191f70ST Makphaibulchoke if (cache) 18057a2508e1SJan Kara mb_cache_destroy(cache); 1806ac27a0ecSDave Kleikamp } 18079c191f70ST Makphaibulchoke 1808