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 7547387409STahsin Erdogan static void ext4_xattr_block_cache_insert(struct mb_cache *, 7647387409STahsin Erdogan struct buffer_head *); 7747387409STahsin Erdogan static struct buffer_head * 7847387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *, struct ext4_xattr_header *, 797a2508e1SJan Kara struct mb_cache_entry **); 80*daf83281STahsin Erdogan static void ext4_xattr_hash_entry(struct ext4_xattr_entry *entry, 81*daf83281STahsin Erdogan void *value_base); 82*daf83281STahsin Erdogan static void ext4_xattr_rehash(struct ext4_xattr_header *); 83ac27a0ecSDave Kleikamp 84d6006186SEric Biggers static const struct xattr_handler * const 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 10947387409STahsin Erdogan #define EA_BLOCK_CACHE(inode) (((struct ext4_sb_info *) \ 11047387409STahsin Erdogan inode->i_sb->s_fs_info)->s_ea_block_cache) 1119c191f70ST Makphaibulchoke 112dec214d0STahsin Erdogan #define EA_INODE_CACHE(inode) (((struct ext4_sb_info *) \ 113dec214d0STahsin Erdogan inode->i_sb->s_fs_info)->s_ea_inode_cache) 114dec214d0STahsin Erdogan 11530a7eb97STahsin Erdogan static int 11630a7eb97STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 11730a7eb97STahsin Erdogan struct inode *inode); 11830a7eb97STahsin Erdogan 11933d201e0STahsin Erdogan #ifdef CONFIG_LOCKDEP 12033d201e0STahsin Erdogan void ext4_xattr_inode_set_class(struct inode *ea_inode) 12133d201e0STahsin Erdogan { 12233d201e0STahsin Erdogan lockdep_set_subclass(&ea_inode->i_rwsem, 1); 12333d201e0STahsin Erdogan } 12433d201e0STahsin Erdogan #endif 12533d201e0STahsin Erdogan 126cc8e94fdSDarrick J. Wong static __le32 ext4_xattr_block_csum(struct inode *inode, 127cc8e94fdSDarrick J. Wong sector_t block_nr, 128cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 129cc8e94fdSDarrick J. Wong { 130cc8e94fdSDarrick J. Wong struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 131d6a77105STheodore Ts'o __u32 csum; 132d6a77105STheodore Ts'o __le64 dsk_block_nr = cpu_to_le64(block_nr); 133b47820edSDaeho Jeong __u32 dummy_csum = 0; 134b47820edSDaeho Jeong int offset = offsetof(struct ext4_xattr_header, h_checksum); 135cc8e94fdSDarrick J. Wong 136d6a77105STheodore Ts'o csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, 137d6a77105STheodore Ts'o sizeof(dsk_block_nr)); 138b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); 139b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); 140b47820edSDaeho Jeong offset += sizeof(dummy_csum); 141b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, 142b47820edSDaeho Jeong EXT4_BLOCK_SIZE(inode->i_sb) - offset); 14341eb70ddSTao Ma 144cc8e94fdSDarrick J. Wong return cpu_to_le32(csum); 145cc8e94fdSDarrick J. Wong } 146cc8e94fdSDarrick J. Wong 147cc8e94fdSDarrick J. Wong static int ext4_xattr_block_csum_verify(struct inode *inode, 148dac7a4b4STheodore Ts'o struct buffer_head *bh) 149cc8e94fdSDarrick J. Wong { 150dac7a4b4STheodore Ts'o struct ext4_xattr_header *hdr = BHDR(bh); 151dac7a4b4STheodore Ts'o int ret = 1; 152dac7a4b4STheodore Ts'o 153dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) { 154dac7a4b4STheodore Ts'o lock_buffer(bh); 155dac7a4b4STheodore Ts'o ret = (hdr->h_checksum == ext4_xattr_block_csum(inode, 156dac7a4b4STheodore Ts'o bh->b_blocknr, hdr)); 157dac7a4b4STheodore Ts'o unlock_buffer(bh); 158dac7a4b4STheodore Ts'o } 159dac7a4b4STheodore Ts'o return ret; 160cc8e94fdSDarrick J. Wong } 161cc8e94fdSDarrick J. Wong 162cc8e94fdSDarrick J. Wong static void ext4_xattr_block_csum_set(struct inode *inode, 163cc8e94fdSDarrick J. Wong struct buffer_head *bh) 164cc8e94fdSDarrick J. Wong { 165dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) 166dac7a4b4STheodore Ts'o BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode, 167dac7a4b4STheodore Ts'o bh->b_blocknr, BHDR(bh)); 168cc8e94fdSDarrick J. Wong } 169cc8e94fdSDarrick J. Wong 17011e27528SStephen Hemminger static inline const struct xattr_handler * 171617ba13bSMingming Cao ext4_xattr_handler(int name_index) 172ac27a0ecSDave Kleikamp { 17311e27528SStephen Hemminger const struct xattr_handler *handler = NULL; 174ac27a0ecSDave Kleikamp 175617ba13bSMingming Cao if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) 176617ba13bSMingming Cao handler = ext4_xattr_handler_map[name_index]; 177ac27a0ecSDave Kleikamp return handler; 178ac27a0ecSDave Kleikamp } 179ac27a0ecSDave Kleikamp 180ac27a0ecSDave Kleikamp static int 1812c4f9923SEric Biggers ext4_xattr_check_entries(struct ext4_xattr_entry *entry, void *end, 182a0626e75SDarrick J. Wong void *value_start) 183ac27a0ecSDave Kleikamp { 184a0626e75SDarrick J. Wong struct ext4_xattr_entry *e = entry; 185a0626e75SDarrick J. Wong 186d7614cc1SEric Biggers /* Find the end of the names list */ 187a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(e)) { 188a0626e75SDarrick J. Wong struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); 189ac27a0ecSDave Kleikamp if ((void *)next >= end) 1906a797d27SDarrick J. Wong return -EFSCORRUPTED; 191a0626e75SDarrick J. Wong e = next; 192ac27a0ecSDave Kleikamp } 193a0626e75SDarrick J. Wong 194d7614cc1SEric Biggers /* Check the values */ 195a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(entry)) { 196e50e5129SAndreas Dilger if (entry->e_value_size != 0 && 197e50e5129SAndreas Dilger entry->e_value_inum == 0) { 198d7614cc1SEric Biggers u16 offs = le16_to_cpu(entry->e_value_offs); 199d7614cc1SEric Biggers u32 size = le32_to_cpu(entry->e_value_size); 200d7614cc1SEric Biggers void *value; 201d7614cc1SEric Biggers 202d7614cc1SEric Biggers /* 203d7614cc1SEric Biggers * The value cannot overlap the names, and the value 204d7614cc1SEric Biggers * with padding cannot extend beyond 'end'. Check both 205d7614cc1SEric Biggers * the padded and unpadded sizes, since the size may 206d7614cc1SEric Biggers * overflow to 0 when adding padding. 207d7614cc1SEric Biggers */ 208d7614cc1SEric Biggers if (offs > end - value_start) 2096a797d27SDarrick J. Wong return -EFSCORRUPTED; 210d7614cc1SEric Biggers value = value_start + offs; 211d7614cc1SEric Biggers if (value < (void *)e + sizeof(u32) || 212d7614cc1SEric Biggers size > end - value || 213d7614cc1SEric Biggers EXT4_XATTR_SIZE(size) > end - value) 214d7614cc1SEric Biggers return -EFSCORRUPTED; 215d7614cc1SEric Biggers } 216a0626e75SDarrick J. Wong entry = EXT4_XATTR_NEXT(entry); 217a0626e75SDarrick J. Wong } 218a0626e75SDarrick J. Wong 219ac27a0ecSDave Kleikamp return 0; 220ac27a0ecSDave Kleikamp } 221ac27a0ecSDave Kleikamp 222ac27a0ecSDave Kleikamp static inline int 223cc8e94fdSDarrick J. Wong ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) 224ac27a0ecSDave Kleikamp { 225cc8e94fdSDarrick J. Wong int error; 226cc8e94fdSDarrick J. Wong 227cc8e94fdSDarrick J. Wong if (buffer_verified(bh)) 228cc8e94fdSDarrick J. Wong return 0; 229cc8e94fdSDarrick J. Wong 230617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 231ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) 2326a797d27SDarrick J. Wong return -EFSCORRUPTED; 233dac7a4b4STheodore Ts'o if (!ext4_xattr_block_csum_verify(inode, bh)) 2346a797d27SDarrick J. Wong return -EFSBADCRC; 2352c4f9923SEric Biggers error = ext4_xattr_check_entries(BFIRST(bh), bh->b_data + bh->b_size, 236a0626e75SDarrick J. Wong bh->b_data); 237cc8e94fdSDarrick J. Wong if (!error) 238cc8e94fdSDarrick J. Wong set_buffer_verified(bh); 239cc8e94fdSDarrick J. Wong return error; 240ac27a0ecSDave Kleikamp } 241ac27a0ecSDave Kleikamp 2429e92f48cSTheodore Ts'o static int 2439e92f48cSTheodore Ts'o __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, 2449e92f48cSTheodore Ts'o void *end, const char *function, unsigned int line) 2459e92f48cSTheodore Ts'o { 2469e92f48cSTheodore Ts'o int error = -EFSCORRUPTED; 2479e92f48cSTheodore Ts'o 248290ab230SEric Biggers if (end - (void *)header < sizeof(*header) + sizeof(u32) || 24919962509SEric Biggers (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) 2509e92f48cSTheodore Ts'o goto errout; 2512c4f9923SEric Biggers error = ext4_xattr_check_entries(IFIRST(header), end, IFIRST(header)); 2529e92f48cSTheodore Ts'o errout: 2539e92f48cSTheodore Ts'o if (error) 2549e92f48cSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, 2559e92f48cSTheodore Ts'o "corrupted in-inode xattr"); 2569e92f48cSTheodore Ts'o return error; 2579e92f48cSTheodore Ts'o } 2589e92f48cSTheodore Ts'o 2599e92f48cSTheodore Ts'o #define xattr_check_inode(inode, header, end) \ 2609e92f48cSTheodore Ts'o __xattr_check_inode((inode), (header), (end), __func__, __LINE__) 2619e92f48cSTheodore Ts'o 262ac27a0ecSDave Kleikamp static int 263617ba13bSMingming Cao ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, 2646ba644b9SEric Biggers const char *name, 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; 284ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 285ac27a0ecSDave Kleikamp } 286ac27a0ecSDave Kleikamp 287dec214d0STahsin Erdogan static u32 288dec214d0STahsin Erdogan ext4_xattr_inode_hash(struct ext4_sb_info *sbi, const void *buffer, size_t size) 289dec214d0STahsin Erdogan { 290dec214d0STahsin Erdogan return ext4_chksum(sbi, sbi->s_csum_seed, buffer, size); 291dec214d0STahsin Erdogan } 292dec214d0STahsin Erdogan 293dec214d0STahsin Erdogan static u64 ext4_xattr_inode_get_ref(struct inode *ea_inode) 294dec214d0STahsin Erdogan { 295dec214d0STahsin Erdogan return ((u64)ea_inode->i_ctime.tv_sec << 32) | 296dec214d0STahsin Erdogan ((u32)ea_inode->i_version); 297dec214d0STahsin Erdogan } 298dec214d0STahsin Erdogan 299dec214d0STahsin Erdogan static void ext4_xattr_inode_set_ref(struct inode *ea_inode, u64 ref_count) 300dec214d0STahsin Erdogan { 301dec214d0STahsin Erdogan ea_inode->i_ctime.tv_sec = (u32)(ref_count >> 32); 302dec214d0STahsin Erdogan ea_inode->i_version = (u32)ref_count; 303dec214d0STahsin Erdogan } 304dec214d0STahsin Erdogan 305dec214d0STahsin Erdogan static u32 ext4_xattr_inode_get_hash(struct inode *ea_inode) 306dec214d0STahsin Erdogan { 307dec214d0STahsin Erdogan return (u32)ea_inode->i_atime.tv_sec; 308dec214d0STahsin Erdogan } 309dec214d0STahsin Erdogan 310dec214d0STahsin Erdogan static void ext4_xattr_inode_set_hash(struct inode *ea_inode, u32 hash) 311dec214d0STahsin Erdogan { 312dec214d0STahsin Erdogan ea_inode->i_atime.tv_sec = hash; 313dec214d0STahsin Erdogan } 314dec214d0STahsin Erdogan 315e50e5129SAndreas Dilger /* 316e50e5129SAndreas Dilger * Read the EA value from an inode. 317e50e5129SAndreas Dilger */ 31890966693STahsin Erdogan static int ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t size) 319e50e5129SAndreas Dilger { 320e50e5129SAndreas Dilger unsigned long block = 0; 321dec214d0STahsin Erdogan struct buffer_head *bh; 32290966693STahsin Erdogan int blocksize = ea_inode->i_sb->s_blocksize; 32390966693STahsin Erdogan size_t csize, copied = 0; 324dec214d0STahsin Erdogan void *copy_pos = buf; 325e50e5129SAndreas Dilger 32690966693STahsin Erdogan while (copied < size) { 32790966693STahsin Erdogan csize = (size - copied) > blocksize ? blocksize : size - copied; 328e50e5129SAndreas Dilger bh = ext4_bread(NULL, ea_inode, block, 0); 32990966693STahsin Erdogan if (IS_ERR(bh)) 330e50e5129SAndreas Dilger return PTR_ERR(bh); 33190966693STahsin Erdogan if (!bh) 33290966693STahsin Erdogan return -EFSCORRUPTED; 33390966693STahsin Erdogan 334dec214d0STahsin Erdogan memcpy(copy_pos, bh->b_data, csize); 335e50e5129SAndreas Dilger brelse(bh); 336e50e5129SAndreas Dilger 337dec214d0STahsin Erdogan copy_pos += csize; 338e50e5129SAndreas Dilger block += 1; 33990966693STahsin Erdogan copied += csize; 340e50e5129SAndreas Dilger } 341e50e5129SAndreas Dilger return 0; 342e50e5129SAndreas Dilger } 343e50e5129SAndreas Dilger 344bab79b04STahsin Erdogan static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, 345bab79b04STahsin Erdogan struct inode **ea_inode) 346e50e5129SAndreas Dilger { 347bab79b04STahsin Erdogan struct inode *inode; 348bab79b04STahsin Erdogan int err; 349e50e5129SAndreas Dilger 350bab79b04STahsin Erdogan inode = ext4_iget(parent->i_sb, ea_ino); 351bab79b04STahsin Erdogan if (IS_ERR(inode)) { 352bab79b04STahsin Erdogan err = PTR_ERR(inode); 353dec214d0STahsin Erdogan ext4_error(parent->i_sb, 354dec214d0STahsin Erdogan "error while reading EA inode %lu err=%d", ea_ino, 355dec214d0STahsin Erdogan err); 356bab79b04STahsin Erdogan return err; 357e50e5129SAndreas Dilger } 358e50e5129SAndreas Dilger 359bab79b04STahsin Erdogan if (is_bad_inode(inode)) { 360dec214d0STahsin Erdogan ext4_error(parent->i_sb, 361dec214d0STahsin Erdogan "error while reading EA inode %lu is_bad_inode", 362dec214d0STahsin Erdogan ea_ino); 363bab79b04STahsin Erdogan err = -EIO; 364e50e5129SAndreas Dilger goto error; 365e50e5129SAndreas Dilger } 366e50e5129SAndreas Dilger 367bab79b04STahsin Erdogan if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) { 368dec214d0STahsin Erdogan ext4_error(parent->i_sb, 369dec214d0STahsin Erdogan "EA inode %lu does not have EXT4_EA_INODE_FL flag", 370dec214d0STahsin Erdogan ea_ino); 371bab79b04STahsin Erdogan err = -EINVAL; 372e50e5129SAndreas Dilger goto error; 373e50e5129SAndreas Dilger } 374e50e5129SAndreas Dilger 375bab79b04STahsin Erdogan *ea_inode = inode; 376bab79b04STahsin Erdogan return 0; 377e50e5129SAndreas Dilger error: 378bab79b04STahsin Erdogan iput(inode); 379bab79b04STahsin Erdogan return err; 380e50e5129SAndreas Dilger } 381e50e5129SAndreas Dilger 382dec214d0STahsin Erdogan static int 383dec214d0STahsin Erdogan ext4_xattr_inode_verify_hash(struct inode *ea_inode, void *buffer, size_t size) 384dec214d0STahsin Erdogan { 385dec214d0STahsin Erdogan u32 hash; 386dec214d0STahsin Erdogan 387dec214d0STahsin Erdogan /* Verify stored hash matches calculated hash. */ 388dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); 389dec214d0STahsin Erdogan if (hash != ext4_xattr_inode_get_hash(ea_inode)) 390dec214d0STahsin Erdogan return -EFSCORRUPTED; 391dec214d0STahsin Erdogan return 0; 392dec214d0STahsin Erdogan } 393dec214d0STahsin Erdogan 394dec214d0STahsin Erdogan #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec) 395dec214d0STahsin Erdogan 396e50e5129SAndreas Dilger /* 397e50e5129SAndreas Dilger * Read the value from the EA inode. 398e50e5129SAndreas Dilger */ 399e50e5129SAndreas Dilger static int 400e50e5129SAndreas Dilger ext4_xattr_inode_get(struct inode *inode, unsigned long ea_ino, void *buffer, 40190966693STahsin Erdogan size_t size) 402e50e5129SAndreas Dilger { 403dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 404bab79b04STahsin Erdogan struct inode *ea_inode; 405dec214d0STahsin Erdogan int err; 406e50e5129SAndreas Dilger 407dec214d0STahsin Erdogan err = ext4_xattr_inode_iget(inode, ea_ino, &ea_inode); 408dec214d0STahsin Erdogan if (err) { 409dec214d0STahsin Erdogan ea_inode = NULL; 410dec214d0STahsin Erdogan goto out; 411dec214d0STahsin Erdogan } 412e50e5129SAndreas Dilger 413dec214d0STahsin Erdogan if (i_size_read(ea_inode) != size) { 414dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 415dec214d0STahsin Erdogan "ea_inode file size=%llu entry size=%zu", 416dec214d0STahsin Erdogan i_size_read(ea_inode), size); 417dec214d0STahsin Erdogan err = -EFSCORRUPTED; 418dec214d0STahsin Erdogan goto out; 419dec214d0STahsin Erdogan } 420dec214d0STahsin Erdogan 421dec214d0STahsin Erdogan err = ext4_xattr_inode_read(ea_inode, buffer, size); 422dec214d0STahsin Erdogan if (err) 423dec214d0STahsin Erdogan goto out; 424dec214d0STahsin Erdogan 425dec214d0STahsin Erdogan err = ext4_xattr_inode_verify_hash(ea_inode, buffer, size); 426dec214d0STahsin Erdogan /* 427dec214d0STahsin Erdogan * Compatibility check for old Lustre ea_inode implementation. Old 428dec214d0STahsin Erdogan * version does not have hash validation, but it has a backpointer 429dec214d0STahsin Erdogan * from ea_inode to the parent inode. 430dec214d0STahsin Erdogan */ 431dec214d0STahsin Erdogan if (err == -EFSCORRUPTED) { 432dec214d0STahsin Erdogan if (EXT4_XATTR_INODE_GET_PARENT(ea_inode) != inode->i_ino || 433dec214d0STahsin Erdogan ea_inode->i_generation != inode->i_generation) { 434dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 435dec214d0STahsin Erdogan "EA inode hash validation failed"); 436dec214d0STahsin Erdogan goto out; 437dec214d0STahsin Erdogan } 438dec214d0STahsin Erdogan /* Do not add ea_inode to the cache. */ 439dec214d0STahsin Erdogan ea_inode_cache = NULL; 440dec214d0STahsin Erdogan } else if (err) 441dec214d0STahsin Erdogan goto out; 442dec214d0STahsin Erdogan 443dec214d0STahsin Erdogan if (ea_inode_cache) 444dec214d0STahsin Erdogan mb_cache_entry_create(ea_inode_cache, GFP_NOFS, 445dec214d0STahsin Erdogan ext4_xattr_inode_get_hash(ea_inode), 446dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 447dec214d0STahsin Erdogan out: 448e50e5129SAndreas Dilger iput(ea_inode); 449dec214d0STahsin Erdogan return err; 450e50e5129SAndreas Dilger } 451e50e5129SAndreas Dilger 452ac27a0ecSDave Kleikamp static int 453617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 454ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 455ac27a0ecSDave Kleikamp { 456ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 457617ba13bSMingming Cao struct ext4_xattr_entry *entry; 458ac27a0ecSDave Kleikamp size_t size; 459ac27a0ecSDave Kleikamp int error; 46047387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 461ac27a0ecSDave Kleikamp 462ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 463ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 464ac27a0ecSDave Kleikamp 465ac27a0ecSDave Kleikamp error = -ENODATA; 466617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 467ac27a0ecSDave Kleikamp goto cleanup; 468ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 469ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 470617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 471ac27a0ecSDave Kleikamp if (!bh) 472ac27a0ecSDave Kleikamp goto cleanup; 473ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 474ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 475cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 47624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 477617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 4786a797d27SDarrick J. Wong error = -EFSCORRUPTED; 479ac27a0ecSDave Kleikamp goto cleanup; 480ac27a0ecSDave Kleikamp } 48147387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bh); 482ac27a0ecSDave Kleikamp entry = BFIRST(bh); 4836ba644b9SEric Biggers error = ext4_xattr_find_entry(&entry, name_index, name, 1); 484ac27a0ecSDave Kleikamp if (error) 485ac27a0ecSDave Kleikamp goto cleanup; 486ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 487ac27a0ecSDave Kleikamp if (buffer) { 488ac27a0ecSDave Kleikamp error = -ERANGE; 489ac27a0ecSDave Kleikamp if (size > buffer_size) 490ac27a0ecSDave Kleikamp goto cleanup; 491e50e5129SAndreas Dilger if (entry->e_value_inum) { 492e50e5129SAndreas Dilger error = ext4_xattr_inode_get(inode, 493e50e5129SAndreas Dilger le32_to_cpu(entry->e_value_inum), 49490966693STahsin Erdogan buffer, size); 495e50e5129SAndreas Dilger if (error) 496e50e5129SAndreas Dilger goto cleanup; 497e50e5129SAndreas Dilger } else { 498e50e5129SAndreas Dilger memcpy(buffer, bh->b_data + 499e50e5129SAndreas Dilger le16_to_cpu(entry->e_value_offs), size); 500e50e5129SAndreas Dilger } 501ac27a0ecSDave Kleikamp } 502ac27a0ecSDave Kleikamp error = size; 503ac27a0ecSDave Kleikamp 504ac27a0ecSDave Kleikamp cleanup: 505ac27a0ecSDave Kleikamp brelse(bh); 506ac27a0ecSDave Kleikamp return error; 507ac27a0ecSDave Kleikamp } 508ac27a0ecSDave Kleikamp 509879b3825STao Ma int 510617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 511ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 512ac27a0ecSDave Kleikamp { 513617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 514617ba13bSMingming Cao struct ext4_xattr_entry *entry; 515617ba13bSMingming Cao struct ext4_inode *raw_inode; 516617ba13bSMingming Cao struct ext4_iloc iloc; 517ac27a0ecSDave Kleikamp size_t size; 518ac27a0ecSDave Kleikamp void *end; 519ac27a0ecSDave Kleikamp int error; 520ac27a0ecSDave Kleikamp 52119f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 522ac27a0ecSDave Kleikamp return -ENODATA; 523617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 524ac27a0ecSDave Kleikamp if (error) 525ac27a0ecSDave Kleikamp return error; 526617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 527ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 528617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 5299e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 530ac27a0ecSDave Kleikamp if (error) 531ac27a0ecSDave Kleikamp goto cleanup; 5326ba644b9SEric Biggers entry = IFIRST(header); 5336ba644b9SEric Biggers error = ext4_xattr_find_entry(&entry, name_index, name, 0); 534ac27a0ecSDave Kleikamp if (error) 535ac27a0ecSDave Kleikamp goto cleanup; 536ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 537ac27a0ecSDave Kleikamp if (buffer) { 538ac27a0ecSDave Kleikamp error = -ERANGE; 539ac27a0ecSDave Kleikamp if (size > buffer_size) 540ac27a0ecSDave Kleikamp goto cleanup; 541e50e5129SAndreas Dilger if (entry->e_value_inum) { 542e50e5129SAndreas Dilger error = ext4_xattr_inode_get(inode, 543e50e5129SAndreas Dilger le32_to_cpu(entry->e_value_inum), 54490966693STahsin Erdogan buffer, size); 545e50e5129SAndreas Dilger if (error) 546e50e5129SAndreas Dilger goto cleanup; 547e50e5129SAndreas Dilger } else { 548ac27a0ecSDave Kleikamp memcpy(buffer, (void *)IFIRST(header) + 549ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs), size); 550ac27a0ecSDave Kleikamp } 551e50e5129SAndreas Dilger } 552ac27a0ecSDave Kleikamp error = size; 553ac27a0ecSDave Kleikamp 554ac27a0ecSDave Kleikamp cleanup: 555ac27a0ecSDave Kleikamp brelse(iloc.bh); 556ac27a0ecSDave Kleikamp return error; 557ac27a0ecSDave Kleikamp } 558ac27a0ecSDave Kleikamp 559ac27a0ecSDave Kleikamp /* 560617ba13bSMingming Cao * ext4_xattr_get() 561ac27a0ecSDave Kleikamp * 562ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 563ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 564ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 565ac27a0ecSDave Kleikamp * 566ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 567ac27a0ecSDave Kleikamp * used / required on success. 568ac27a0ecSDave Kleikamp */ 569ac27a0ecSDave Kleikamp int 570617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 571ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 572ac27a0ecSDave Kleikamp { 573ac27a0ecSDave Kleikamp int error; 574ac27a0ecSDave Kleikamp 5750db1ff22STheodore Ts'o if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 5760db1ff22STheodore Ts'o return -EIO; 5770db1ff22STheodore Ts'o 578230b8c1aSZhang Zhen if (strlen(name) > 255) 579230b8c1aSZhang Zhen return -ERANGE; 580230b8c1aSZhang Zhen 581617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 582617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 583ac27a0ecSDave Kleikamp buffer_size); 584ac27a0ecSDave Kleikamp if (error == -ENODATA) 585617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 586ac27a0ecSDave Kleikamp buffer_size); 587617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 588ac27a0ecSDave Kleikamp return error; 589ac27a0ecSDave Kleikamp } 590ac27a0ecSDave Kleikamp 591ac27a0ecSDave Kleikamp static int 592431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 593ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 594ac27a0ecSDave Kleikamp { 595ac27a0ecSDave Kleikamp size_t rest = buffer_size; 596ac27a0ecSDave Kleikamp 597617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 59811e27528SStephen Hemminger const struct xattr_handler *handler = 599617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 600ac27a0ecSDave Kleikamp 601764a5c6bSAndreas Gruenbacher if (handler && (!handler->list || handler->list(dentry))) { 602764a5c6bSAndreas Gruenbacher const char *prefix = handler->prefix ?: handler->name; 603764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 604764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 605764a5c6bSAndreas Gruenbacher 606ac27a0ecSDave Kleikamp if (buffer) { 607ac27a0ecSDave Kleikamp if (size > rest) 608ac27a0ecSDave Kleikamp return -ERANGE; 609764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 610764a5c6bSAndreas Gruenbacher buffer += prefix_len; 611764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 612764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 613764a5c6bSAndreas Gruenbacher *buffer++ = 0; 614ac27a0ecSDave Kleikamp } 615ac27a0ecSDave Kleikamp rest -= size; 616ac27a0ecSDave Kleikamp } 617ac27a0ecSDave Kleikamp } 618764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 619ac27a0ecSDave Kleikamp } 620ac27a0ecSDave Kleikamp 621ac27a0ecSDave Kleikamp static int 622431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 623ac27a0ecSDave Kleikamp { 6242b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 625ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 626ac27a0ecSDave Kleikamp int error; 627ac27a0ecSDave Kleikamp 628ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 629ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 630ac27a0ecSDave Kleikamp 631ac27a0ecSDave Kleikamp error = 0; 632617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 633ac27a0ecSDave Kleikamp goto cleanup; 634ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 635ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 636617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 637ac27a0ecSDave Kleikamp error = -EIO; 638ac27a0ecSDave Kleikamp if (!bh) 639ac27a0ecSDave Kleikamp goto cleanup; 640ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 641ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 642cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 64324676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 644617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 6456a797d27SDarrick J. Wong error = -EFSCORRUPTED; 646ac27a0ecSDave Kleikamp goto cleanup; 647ac27a0ecSDave Kleikamp } 64847387409STahsin Erdogan ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); 649431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); 650ac27a0ecSDave Kleikamp 651ac27a0ecSDave Kleikamp cleanup: 652ac27a0ecSDave Kleikamp brelse(bh); 653ac27a0ecSDave Kleikamp 654ac27a0ecSDave Kleikamp return error; 655ac27a0ecSDave Kleikamp } 656ac27a0ecSDave Kleikamp 657ac27a0ecSDave Kleikamp static int 658431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 659ac27a0ecSDave Kleikamp { 6602b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 661617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 662617ba13bSMingming Cao struct ext4_inode *raw_inode; 663617ba13bSMingming Cao struct ext4_iloc iloc; 664ac27a0ecSDave Kleikamp void *end; 665ac27a0ecSDave Kleikamp int error; 666ac27a0ecSDave Kleikamp 66719f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 668ac27a0ecSDave Kleikamp return 0; 669617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 670ac27a0ecSDave Kleikamp if (error) 671ac27a0ecSDave Kleikamp return error; 672617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 673ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 674617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 6759e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 676ac27a0ecSDave Kleikamp if (error) 677ac27a0ecSDave Kleikamp goto cleanup; 678431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 679ac27a0ecSDave Kleikamp buffer, buffer_size); 680ac27a0ecSDave Kleikamp 681ac27a0ecSDave Kleikamp cleanup: 682ac27a0ecSDave Kleikamp brelse(iloc.bh); 683ac27a0ecSDave Kleikamp return error; 684ac27a0ecSDave Kleikamp } 685ac27a0ecSDave Kleikamp 686ac27a0ecSDave Kleikamp /* 687ba7ea1d8SEric Biggers * Inode operation listxattr() 688ba7ea1d8SEric Biggers * 689ba7ea1d8SEric Biggers * d_inode(dentry)->i_rwsem: don't care 690ac27a0ecSDave Kleikamp * 691ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 692ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 693ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 694ac27a0ecSDave Kleikamp * 695ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 696ac27a0ecSDave Kleikamp * used / required on success. 697ac27a0ecSDave Kleikamp */ 698ba7ea1d8SEric Biggers ssize_t 699ba7ea1d8SEric Biggers ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) 700ac27a0ecSDave Kleikamp { 701eaeef867STheodore Ts'o int ret, ret2; 702ac27a0ecSDave Kleikamp 7032b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 704eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 705eaeef867STheodore Ts'o if (ret < 0) 706eaeef867STheodore Ts'o goto errout; 707ac27a0ecSDave Kleikamp if (buffer) { 708eaeef867STheodore Ts'o buffer += ret; 709eaeef867STheodore Ts'o buffer_size -= ret; 710ac27a0ecSDave Kleikamp } 711eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 712eaeef867STheodore Ts'o if (ret < 0) 713eaeef867STheodore Ts'o goto errout; 714eaeef867STheodore Ts'o ret += ret2; 715eaeef867STheodore Ts'o errout: 7162b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 717eaeef867STheodore Ts'o return ret; 718ac27a0ecSDave Kleikamp } 719ac27a0ecSDave Kleikamp 720ac27a0ecSDave Kleikamp /* 721617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 722ac27a0ecSDave Kleikamp * not set, set it. 723ac27a0ecSDave Kleikamp */ 724617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 725ac27a0ecSDave Kleikamp struct super_block *sb) 726ac27a0ecSDave Kleikamp { 727e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 728ac27a0ecSDave Kleikamp return; 729ac27a0ecSDave Kleikamp 7305d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 731617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 732e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 733a0375156STheodore Ts'o ext4_handle_dirty_super(handle, sb); 734ac27a0ecSDave Kleikamp } 735ac27a0ecSDave Kleikamp } 736ac27a0ecSDave Kleikamp 7377a9ca53aSTahsin Erdogan int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) 7387a9ca53aSTahsin Erdogan { 7397a9ca53aSTahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 7407a9ca53aSTahsin Erdogan struct buffer_head *bh = NULL; 7417a9ca53aSTahsin Erdogan struct ext4_inode *raw_inode; 7427a9ca53aSTahsin Erdogan struct ext4_xattr_ibody_header *header; 7437a9ca53aSTahsin Erdogan struct ext4_xattr_entry *entry; 7447a9ca53aSTahsin Erdogan qsize_t ea_inode_refs = 0; 7457a9ca53aSTahsin Erdogan void *end; 7467a9ca53aSTahsin Erdogan int ret; 7477a9ca53aSTahsin Erdogan 7487a9ca53aSTahsin Erdogan lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); 7497a9ca53aSTahsin Erdogan 7507a9ca53aSTahsin Erdogan if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 7517a9ca53aSTahsin Erdogan ret = ext4_get_inode_loc(inode, &iloc); 7527a9ca53aSTahsin Erdogan if (ret) 7537a9ca53aSTahsin Erdogan goto out; 7547a9ca53aSTahsin Erdogan raw_inode = ext4_raw_inode(&iloc); 7557a9ca53aSTahsin Erdogan header = IHDR(inode, raw_inode); 7567a9ca53aSTahsin Erdogan end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 7577a9ca53aSTahsin Erdogan ret = xattr_check_inode(inode, header, end); 7587a9ca53aSTahsin Erdogan if (ret) 7597a9ca53aSTahsin Erdogan goto out; 7607a9ca53aSTahsin Erdogan 7617a9ca53aSTahsin Erdogan for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); 7627a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 7637a9ca53aSTahsin Erdogan if (entry->e_value_inum) 7647a9ca53aSTahsin Erdogan ea_inode_refs++; 7657a9ca53aSTahsin Erdogan } 7667a9ca53aSTahsin Erdogan 7677a9ca53aSTahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 7687a9ca53aSTahsin Erdogan bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 7697a9ca53aSTahsin Erdogan if (!bh) { 7707a9ca53aSTahsin Erdogan ret = -EIO; 7717a9ca53aSTahsin Erdogan goto out; 7727a9ca53aSTahsin Erdogan } 7737a9ca53aSTahsin Erdogan 7747a9ca53aSTahsin Erdogan if (ext4_xattr_check_block(inode, bh)) { 7757a9ca53aSTahsin Erdogan ret = -EFSCORRUPTED; 7767a9ca53aSTahsin Erdogan goto out; 7777a9ca53aSTahsin Erdogan } 7787a9ca53aSTahsin Erdogan 7797a9ca53aSTahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 7807a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 7817a9ca53aSTahsin Erdogan if (entry->e_value_inum) 7827a9ca53aSTahsin Erdogan ea_inode_refs++; 7837a9ca53aSTahsin Erdogan } 7847a9ca53aSTahsin Erdogan *usage = ea_inode_refs + 1; 7857a9ca53aSTahsin Erdogan ret = 0; 7867a9ca53aSTahsin Erdogan out: 7877a9ca53aSTahsin Erdogan brelse(iloc.bh); 7887a9ca53aSTahsin Erdogan brelse(bh); 7897a9ca53aSTahsin Erdogan return ret; 7907a9ca53aSTahsin Erdogan } 7917a9ca53aSTahsin Erdogan 792dec214d0STahsin Erdogan static inline size_t round_up_cluster(struct inode *inode, size_t length) 793dec214d0STahsin Erdogan { 794dec214d0STahsin Erdogan struct super_block *sb = inode->i_sb; 795dec214d0STahsin Erdogan size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + 796dec214d0STahsin Erdogan inode->i_blkbits); 797dec214d0STahsin Erdogan size_t mask = ~(cluster_size - 1); 798dec214d0STahsin Erdogan 799dec214d0STahsin Erdogan return (length + cluster_size - 1) & mask; 800dec214d0STahsin Erdogan } 801dec214d0STahsin Erdogan 802dec214d0STahsin Erdogan static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) 803dec214d0STahsin Erdogan { 804dec214d0STahsin Erdogan int err; 805dec214d0STahsin Erdogan 806dec214d0STahsin Erdogan err = dquot_alloc_inode(inode); 807dec214d0STahsin Erdogan if (err) 808dec214d0STahsin Erdogan return err; 809dec214d0STahsin Erdogan err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); 810dec214d0STahsin Erdogan if (err) 811dec214d0STahsin Erdogan dquot_free_inode(inode); 812dec214d0STahsin Erdogan return err; 813dec214d0STahsin Erdogan } 814dec214d0STahsin Erdogan 815dec214d0STahsin Erdogan static void ext4_xattr_inode_free_quota(struct inode *inode, size_t len) 816dec214d0STahsin Erdogan { 817dec214d0STahsin Erdogan dquot_free_space_nodirty(inode, round_up_cluster(inode, len)); 818dec214d0STahsin Erdogan dquot_free_inode(inode); 819dec214d0STahsin Erdogan } 820dec214d0STahsin Erdogan 821dec214d0STahsin Erdogan static int __ext4_xattr_set_credits(struct inode *inode, 822dec214d0STahsin Erdogan struct buffer_head *block_bh, 823dec214d0STahsin Erdogan size_t value_len) 824dec214d0STahsin Erdogan { 825dec214d0STahsin Erdogan struct super_block *sb = inode->i_sb; 826dec214d0STahsin Erdogan int credits; 827dec214d0STahsin Erdogan int blocks; 828dec214d0STahsin Erdogan 829dec214d0STahsin Erdogan /* 830dec214d0STahsin Erdogan * 1) Owner inode update 831dec214d0STahsin Erdogan * 2) Ref count update on old xattr block 832dec214d0STahsin Erdogan * 3) new xattr block 833dec214d0STahsin Erdogan * 4) block bitmap update for new xattr block 834dec214d0STahsin Erdogan * 5) group descriptor for new xattr block 835dec214d0STahsin Erdogan * 6) block bitmap update for old xattr block 836dec214d0STahsin Erdogan * 7) group descriptor for old block 837dec214d0STahsin Erdogan * 838dec214d0STahsin Erdogan * 6 & 7 can happen if we have two racing threads T_a and T_b 839dec214d0STahsin Erdogan * which are each trying to set an xattr on inodes I_a and I_b 840dec214d0STahsin Erdogan * which were both initially sharing an xattr block. 841dec214d0STahsin Erdogan */ 842dec214d0STahsin Erdogan credits = 7; 843dec214d0STahsin Erdogan 844dec214d0STahsin Erdogan /* Quota updates. */ 845dec214d0STahsin Erdogan credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); 846dec214d0STahsin Erdogan 847dec214d0STahsin Erdogan /* 848dec214d0STahsin Erdogan * In case of inline data, we may push out the data to a block, 849dec214d0STahsin Erdogan * so we need to reserve credits for this eventuality 850dec214d0STahsin Erdogan */ 851dec214d0STahsin Erdogan if (ext4_has_inline_data(inode)) 852dec214d0STahsin Erdogan credits += ext4_writepage_trans_blocks(inode) + 1; 853dec214d0STahsin Erdogan 854dec214d0STahsin Erdogan /* We are done if ea_inode feature is not enabled. */ 855dec214d0STahsin Erdogan if (!ext4_has_feature_ea_inode(sb)) 856dec214d0STahsin Erdogan return credits; 857dec214d0STahsin Erdogan 858dec214d0STahsin Erdogan /* New ea_inode, inode map, block bitmap, group descriptor. */ 859dec214d0STahsin Erdogan credits += 4; 860dec214d0STahsin Erdogan 861dec214d0STahsin Erdogan /* Data blocks. */ 862dec214d0STahsin Erdogan blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 863dec214d0STahsin Erdogan 864dec214d0STahsin Erdogan /* Indirection block or one level of extent tree. */ 865dec214d0STahsin Erdogan blocks += 1; 866dec214d0STahsin Erdogan 867dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 868dec214d0STahsin Erdogan credits += blocks * 2; 869dec214d0STahsin Erdogan 870dec214d0STahsin Erdogan /* Blocks themselves. */ 871dec214d0STahsin Erdogan credits += blocks; 872dec214d0STahsin Erdogan 873dec214d0STahsin Erdogan /* Dereference ea_inode holding old xattr value. 874dec214d0STahsin Erdogan * Old ea_inode, inode map, block bitmap, group descriptor. 875dec214d0STahsin Erdogan */ 876dec214d0STahsin Erdogan credits += 4; 877dec214d0STahsin Erdogan 878dec214d0STahsin Erdogan /* Data blocks for old ea_inode. */ 879dec214d0STahsin Erdogan blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; 880dec214d0STahsin Erdogan 881dec214d0STahsin Erdogan /* Indirection block or one level of extent tree for old ea_inode. */ 882dec214d0STahsin Erdogan blocks += 1; 883dec214d0STahsin Erdogan 884dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 885dec214d0STahsin Erdogan credits += blocks * 2; 886dec214d0STahsin Erdogan 887dec214d0STahsin Erdogan /* We may need to clone the existing xattr block in which case we need 888dec214d0STahsin Erdogan * to increment ref counts for existing ea_inodes referenced by it. 889dec214d0STahsin Erdogan */ 890dec214d0STahsin Erdogan if (block_bh) { 891dec214d0STahsin Erdogan struct ext4_xattr_entry *entry = BFIRST(block_bh); 892dec214d0STahsin Erdogan 893dec214d0STahsin Erdogan for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) 894dec214d0STahsin Erdogan if (entry->e_value_inum) 895dec214d0STahsin Erdogan /* Ref count update on ea_inode. */ 896dec214d0STahsin Erdogan credits += 1; 897dec214d0STahsin Erdogan } 898dec214d0STahsin Erdogan return credits; 899dec214d0STahsin Erdogan } 900dec214d0STahsin Erdogan 90130a7eb97STahsin Erdogan static int ext4_xattr_ensure_credits(handle_t *handle, struct inode *inode, 90230a7eb97STahsin Erdogan int credits, struct buffer_head *bh, 90330a7eb97STahsin Erdogan bool dirty, bool block_csum) 90430a7eb97STahsin Erdogan { 90530a7eb97STahsin Erdogan int error; 90630a7eb97STahsin Erdogan 90730a7eb97STahsin Erdogan if (!ext4_handle_valid(handle)) 90830a7eb97STahsin Erdogan return 0; 90930a7eb97STahsin Erdogan 91030a7eb97STahsin Erdogan if (handle->h_buffer_credits >= credits) 91130a7eb97STahsin Erdogan return 0; 91230a7eb97STahsin Erdogan 91330a7eb97STahsin Erdogan error = ext4_journal_extend(handle, credits - handle->h_buffer_credits); 91430a7eb97STahsin Erdogan if (!error) 91530a7eb97STahsin Erdogan return 0; 91630a7eb97STahsin Erdogan if (error < 0) { 91730a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Extend journal (error %d)", error); 91830a7eb97STahsin Erdogan return error; 91930a7eb97STahsin Erdogan } 92030a7eb97STahsin Erdogan 92130a7eb97STahsin Erdogan if (bh && dirty) { 92230a7eb97STahsin Erdogan if (block_csum) 92330a7eb97STahsin Erdogan ext4_xattr_block_csum_set(inode, bh); 92430a7eb97STahsin Erdogan error = ext4_handle_dirty_metadata(handle, NULL, bh); 92530a7eb97STahsin Erdogan if (error) { 92630a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Handle metadata (error %d)", 92730a7eb97STahsin Erdogan error); 92830a7eb97STahsin Erdogan return error; 92930a7eb97STahsin Erdogan } 93030a7eb97STahsin Erdogan } 93130a7eb97STahsin Erdogan 93230a7eb97STahsin Erdogan error = ext4_journal_restart(handle, credits); 93330a7eb97STahsin Erdogan if (error) { 93430a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Restart journal (error %d)", error); 93530a7eb97STahsin Erdogan return error; 93630a7eb97STahsin Erdogan } 93730a7eb97STahsin Erdogan 93830a7eb97STahsin Erdogan if (bh) { 93930a7eb97STahsin Erdogan error = ext4_journal_get_write_access(handle, bh); 94030a7eb97STahsin Erdogan if (error) { 94130a7eb97STahsin Erdogan ext4_warning(inode->i_sb, 94230a7eb97STahsin Erdogan "Get write access failed (error %d)", 94330a7eb97STahsin Erdogan error); 94430a7eb97STahsin Erdogan return error; 94530a7eb97STahsin Erdogan } 94630a7eb97STahsin Erdogan } 94730a7eb97STahsin Erdogan return 0; 94830a7eb97STahsin Erdogan } 94930a7eb97STahsin Erdogan 950dec214d0STahsin Erdogan static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, 951dec214d0STahsin Erdogan int ref_change) 952dec214d0STahsin Erdogan { 953dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(ea_inode); 954dec214d0STahsin Erdogan struct ext4_iloc iloc; 955dec214d0STahsin Erdogan s64 ref_count; 956dec214d0STahsin Erdogan u32 hash; 957dec214d0STahsin Erdogan int ret; 958dec214d0STahsin Erdogan 959dec214d0STahsin Erdogan inode_lock(ea_inode); 960dec214d0STahsin Erdogan 961dec214d0STahsin Erdogan ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); 962dec214d0STahsin Erdogan if (ret) { 963dec214d0STahsin Erdogan iloc.bh = NULL; 964dec214d0STahsin Erdogan goto out; 965dec214d0STahsin Erdogan } 966dec214d0STahsin Erdogan 967dec214d0STahsin Erdogan ref_count = ext4_xattr_inode_get_ref(ea_inode); 968dec214d0STahsin Erdogan ref_count += ref_change; 969dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, ref_count); 970dec214d0STahsin Erdogan 971dec214d0STahsin Erdogan if (ref_change > 0) { 972dec214d0STahsin Erdogan WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", 973dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 974dec214d0STahsin Erdogan 975dec214d0STahsin Erdogan if (ref_count == 1) { 976dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", 977dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 978dec214d0STahsin Erdogan 979dec214d0STahsin Erdogan set_nlink(ea_inode, 1); 980dec214d0STahsin Erdogan ext4_orphan_del(handle, ea_inode); 981dec214d0STahsin Erdogan 982dec214d0STahsin Erdogan hash = ext4_xattr_inode_get_hash(ea_inode); 983dec214d0STahsin Erdogan mb_cache_entry_create(ea_inode_cache, GFP_NOFS, hash, 984dec214d0STahsin Erdogan ea_inode->i_ino, 985dec214d0STahsin Erdogan true /* reusable */); 986dec214d0STahsin Erdogan } 987dec214d0STahsin Erdogan } else { 988dec214d0STahsin Erdogan WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", 989dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 990dec214d0STahsin Erdogan 991dec214d0STahsin Erdogan if (ref_count == 0) { 992dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink != 1, 993dec214d0STahsin Erdogan "EA inode %lu i_nlink=%u", 994dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 995dec214d0STahsin Erdogan 996dec214d0STahsin Erdogan clear_nlink(ea_inode); 997dec214d0STahsin Erdogan ext4_orphan_add(handle, ea_inode); 998dec214d0STahsin Erdogan 999dec214d0STahsin Erdogan hash = ext4_xattr_inode_get_hash(ea_inode); 1000dec214d0STahsin Erdogan mb_cache_entry_delete(ea_inode_cache, hash, 1001dec214d0STahsin Erdogan ea_inode->i_ino); 1002dec214d0STahsin Erdogan } 1003dec214d0STahsin Erdogan } 1004dec214d0STahsin Erdogan 1005dec214d0STahsin Erdogan ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); 1006dec214d0STahsin Erdogan iloc.bh = NULL; 1007dec214d0STahsin Erdogan if (ret) 1008dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 1009dec214d0STahsin Erdogan "ext4_mark_iloc_dirty() failed ret=%d", ret); 1010dec214d0STahsin Erdogan out: 1011dec214d0STahsin Erdogan brelse(iloc.bh); 1012dec214d0STahsin Erdogan inode_unlock(ea_inode); 1013dec214d0STahsin Erdogan return ret; 1014dec214d0STahsin Erdogan } 1015dec214d0STahsin Erdogan 1016dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) 1017dec214d0STahsin Erdogan { 1018dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, 1); 1019dec214d0STahsin Erdogan } 1020dec214d0STahsin Erdogan 1021dec214d0STahsin Erdogan static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) 1022dec214d0STahsin Erdogan { 1023dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, -1); 1024dec214d0STahsin Erdogan } 1025dec214d0STahsin Erdogan 1026dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, 1027dec214d0STahsin Erdogan struct ext4_xattr_entry *first) 1028dec214d0STahsin Erdogan { 1029dec214d0STahsin Erdogan struct inode *ea_inode; 1030dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 1031dec214d0STahsin Erdogan struct ext4_xattr_entry *failed_entry; 1032dec214d0STahsin Erdogan unsigned int ea_ino; 1033dec214d0STahsin Erdogan int err, saved_err; 1034dec214d0STahsin Erdogan 1035dec214d0STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 1036dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1037dec214d0STahsin Erdogan if (!entry->e_value_inum) 1038dec214d0STahsin Erdogan continue; 1039dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1040dec214d0STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, &ea_inode); 1041dec214d0STahsin Erdogan if (err) 1042dec214d0STahsin Erdogan goto cleanup; 1043dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1044dec214d0STahsin Erdogan if (err) { 1045dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "inc ref error %d", err); 1046dec214d0STahsin Erdogan iput(ea_inode); 1047dec214d0STahsin Erdogan goto cleanup; 1048dec214d0STahsin Erdogan } 1049dec214d0STahsin Erdogan iput(ea_inode); 1050dec214d0STahsin Erdogan } 1051dec214d0STahsin Erdogan return 0; 1052dec214d0STahsin Erdogan 1053dec214d0STahsin Erdogan cleanup: 1054dec214d0STahsin Erdogan saved_err = err; 1055dec214d0STahsin Erdogan failed_entry = entry; 1056dec214d0STahsin Erdogan 1057dec214d0STahsin Erdogan for (entry = first; entry != failed_entry; 1058dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1059dec214d0STahsin Erdogan if (!entry->e_value_inum) 1060dec214d0STahsin Erdogan continue; 1061dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1062dec214d0STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, &ea_inode); 1063dec214d0STahsin Erdogan if (err) { 1064dec214d0STahsin Erdogan ext4_warning(parent->i_sb, 1065dec214d0STahsin Erdogan "cleanup ea_ino %u iget error %d", ea_ino, 1066dec214d0STahsin Erdogan err); 1067dec214d0STahsin Erdogan continue; 1068dec214d0STahsin Erdogan } 1069dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1070dec214d0STahsin Erdogan if (err) 1071dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "cleanup dec ref error %d", 1072dec214d0STahsin Erdogan err); 1073dec214d0STahsin Erdogan iput(ea_inode); 1074dec214d0STahsin Erdogan } 1075dec214d0STahsin Erdogan return saved_err; 1076dec214d0STahsin Erdogan } 1077dec214d0STahsin Erdogan 107830a7eb97STahsin Erdogan static void 1079dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, 108030a7eb97STahsin Erdogan struct buffer_head *bh, 108130a7eb97STahsin Erdogan struct ext4_xattr_entry *first, bool block_csum, 108230a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1083dec214d0STahsin Erdogan int extra_credits, bool skip_quota) 108430a7eb97STahsin Erdogan { 108530a7eb97STahsin Erdogan struct inode *ea_inode; 108630a7eb97STahsin Erdogan struct ext4_xattr_entry *entry; 108730a7eb97STahsin Erdogan bool dirty = false; 108830a7eb97STahsin Erdogan unsigned int ea_ino; 108930a7eb97STahsin Erdogan int err; 109030a7eb97STahsin Erdogan int credits; 109130a7eb97STahsin Erdogan 109230a7eb97STahsin Erdogan /* One credit for dec ref on ea_inode, one for orphan list addition, */ 109330a7eb97STahsin Erdogan credits = 2 + extra_credits; 109430a7eb97STahsin Erdogan 109530a7eb97STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 109630a7eb97STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 109730a7eb97STahsin Erdogan if (!entry->e_value_inum) 109830a7eb97STahsin Erdogan continue; 109930a7eb97STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 110030a7eb97STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, &ea_inode); 110130a7eb97STahsin Erdogan if (err) 110230a7eb97STahsin Erdogan continue; 110330a7eb97STahsin Erdogan 110430a7eb97STahsin Erdogan err = ext4_expand_inode_array(ea_inode_array, ea_inode); 110530a7eb97STahsin Erdogan if (err) { 110630a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, 110730a7eb97STahsin Erdogan "Expand inode array err=%d", err); 110830a7eb97STahsin Erdogan iput(ea_inode); 110930a7eb97STahsin Erdogan continue; 111030a7eb97STahsin Erdogan } 111130a7eb97STahsin Erdogan 111230a7eb97STahsin Erdogan err = ext4_xattr_ensure_credits(handle, parent, credits, bh, 111330a7eb97STahsin Erdogan dirty, block_csum); 111430a7eb97STahsin Erdogan if (err) { 111530a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, "Ensure credits err=%d", 111630a7eb97STahsin Erdogan err); 111730a7eb97STahsin Erdogan continue; 111830a7eb97STahsin Erdogan } 111930a7eb97STahsin Erdogan 1120dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1121dec214d0STahsin Erdogan if (err) { 1122dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", 1123dec214d0STahsin Erdogan err); 1124dec214d0STahsin Erdogan continue; 1125dec214d0STahsin Erdogan } 1126dec214d0STahsin Erdogan 1127dec214d0STahsin Erdogan if (!skip_quota) 1128dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(parent, 1129dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 113030a7eb97STahsin Erdogan 113130a7eb97STahsin Erdogan /* 113230a7eb97STahsin Erdogan * Forget about ea_inode within the same transaction that 113330a7eb97STahsin Erdogan * decrements the ref count. This avoids duplicate decrements in 113430a7eb97STahsin Erdogan * case the rest of the work spills over to subsequent 113530a7eb97STahsin Erdogan * transactions. 113630a7eb97STahsin Erdogan */ 113730a7eb97STahsin Erdogan entry->e_value_inum = 0; 113830a7eb97STahsin Erdogan entry->e_value_size = 0; 113930a7eb97STahsin Erdogan 114030a7eb97STahsin Erdogan dirty = true; 114130a7eb97STahsin Erdogan } 114230a7eb97STahsin Erdogan 114330a7eb97STahsin Erdogan if (dirty) { 114430a7eb97STahsin Erdogan /* 114530a7eb97STahsin Erdogan * Note that we are deliberately skipping csum calculation for 114630a7eb97STahsin Erdogan * the final update because we do not expect any journal 114730a7eb97STahsin Erdogan * restarts until xattr block is freed. 114830a7eb97STahsin Erdogan */ 114930a7eb97STahsin Erdogan 115030a7eb97STahsin Erdogan err = ext4_handle_dirty_metadata(handle, NULL, bh); 115130a7eb97STahsin Erdogan if (err) 115230a7eb97STahsin Erdogan ext4_warning_inode(parent, 115330a7eb97STahsin Erdogan "handle dirty metadata err=%d", err); 115430a7eb97STahsin Erdogan } 115530a7eb97STahsin Erdogan } 115630a7eb97STahsin Erdogan 1157ac27a0ecSDave Kleikamp /* 1158ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 1159ec4cb1aaSJan Kara * otherwise free the block. 1160ac27a0ecSDave Kleikamp */ 1161ac27a0ecSDave Kleikamp static void 1162617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 1163dec214d0STahsin Erdogan struct buffer_head *bh, 1164dec214d0STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1165dec214d0STahsin Erdogan int extra_credits) 1166ac27a0ecSDave Kleikamp { 116747387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 11686048c64bSAndreas Gruenbacher u32 hash, ref; 11698a2bfdcbSMingming Cao int error = 0; 1170ac27a0ecSDave Kleikamp 11715d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 11728a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 11738a2bfdcbSMingming Cao if (error) 11748a2bfdcbSMingming Cao goto out; 11758a2bfdcbSMingming Cao 11768a2bfdcbSMingming Cao lock_buffer(bh); 11776048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 11786048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 11796048c64bSAndreas Gruenbacher if (ref == 1) { 1180ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 118182939d79SJan Kara /* 118282939d79SJan Kara * This must happen under buffer lock for 118382939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 118482939d79SJan Kara */ 118547387409STahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, bh->b_blocknr); 1186ac27a0ecSDave Kleikamp get_bh(bh); 1187ec4cb1aaSJan Kara unlock_buffer(bh); 1188dec214d0STahsin Erdogan 1189dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) 1190dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, bh, 1191dec214d0STahsin Erdogan BFIRST(bh), 1192dec214d0STahsin Erdogan true /* block_csum */, 1193dec214d0STahsin Erdogan ea_inode_array, 1194dec214d0STahsin Erdogan extra_credits, 1195dec214d0STahsin Erdogan true /* skip_quota */); 1196e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 1197e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 1198e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 1199ac27a0ecSDave Kleikamp } else { 12006048c64bSAndreas Gruenbacher ref--; 12016048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 12026048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 12036048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 12046048c64bSAndreas Gruenbacher 120547387409STahsin Erdogan ce = mb_cache_entry_get(ea_block_cache, hash, 12066048c64bSAndreas Gruenbacher bh->b_blocknr); 12076048c64bSAndreas Gruenbacher if (ce) { 12086048c64bSAndreas Gruenbacher ce->e_reusable = 1; 120947387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 12106048c64bSAndreas Gruenbacher } 12116048c64bSAndreas Gruenbacher } 12126048c64bSAndreas Gruenbacher 1213dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bh); 1214ec4cb1aaSJan Kara /* 1215ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 1216ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 1217ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 1218ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 1219ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 1220dac7a4b4STheodore Ts'o * call ext4_handle_dirty_metadata() with locked buffer as 1221ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 1222ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 1223ec4cb1aaSJan Kara */ 1224ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 1225dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1226c1bb05a6SEric Sandeen unlock_buffer(bh); 1227ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 1228dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1229ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 12300390131bSFrank Mayhar ext4_handle_sync(handle); 12311231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 1232ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 1233ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 1234ac27a0ecSDave Kleikamp } 12358a2bfdcbSMingming Cao out: 12368a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 12378a2bfdcbSMingming Cao return; 1238ac27a0ecSDave Kleikamp } 1239ac27a0ecSDave Kleikamp 12406dd4ee7cSKalpak Shah /* 12416dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 12426dd4ee7cSKalpak Shah * bytes used by EA entries. 12436dd4ee7cSKalpak Shah */ 12446dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 12456dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 12466dd4ee7cSKalpak Shah { 12476dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1248e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 12496dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 12506dd4ee7cSKalpak Shah if (offs < *min_offs) 12516dd4ee7cSKalpak Shah *min_offs = offs; 12526dd4ee7cSKalpak Shah } 12537b1b2c1bSTheodore Ts'o if (total) 12547b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 12556dd4ee7cSKalpak Shah } 12566dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 12576dd4ee7cSKalpak Shah } 12586dd4ee7cSKalpak Shah 1259e50e5129SAndreas Dilger /* 1260e50e5129SAndreas Dilger * Write the value of the EA in an inode. 1261e50e5129SAndreas Dilger */ 1262e50e5129SAndreas Dilger static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, 1263e50e5129SAndreas Dilger const void *buf, int bufsize) 1264e50e5129SAndreas Dilger { 1265e50e5129SAndreas Dilger struct buffer_head *bh = NULL; 1266e50e5129SAndreas Dilger unsigned long block = 0; 1267dec214d0STahsin Erdogan int blocksize = ea_inode->i_sb->s_blocksize; 1268dec214d0STahsin Erdogan int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; 1269e50e5129SAndreas Dilger int csize, wsize = 0; 1270e50e5129SAndreas Dilger int ret = 0; 1271e50e5129SAndreas Dilger int retries = 0; 1272e50e5129SAndreas Dilger 1273e50e5129SAndreas Dilger retry: 1274e50e5129SAndreas Dilger while (ret >= 0 && ret < max_blocks) { 1275e50e5129SAndreas Dilger struct ext4_map_blocks map; 1276e50e5129SAndreas Dilger map.m_lblk = block += ret; 1277e50e5129SAndreas Dilger map.m_len = max_blocks -= ret; 1278e50e5129SAndreas Dilger 1279e50e5129SAndreas Dilger ret = ext4_map_blocks(handle, ea_inode, &map, 1280e50e5129SAndreas Dilger EXT4_GET_BLOCKS_CREATE); 1281e50e5129SAndreas Dilger if (ret <= 0) { 1282e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1283e50e5129SAndreas Dilger if (ret == -ENOSPC && 1284e50e5129SAndreas Dilger ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { 1285e50e5129SAndreas Dilger ret = 0; 1286e50e5129SAndreas Dilger goto retry; 1287e50e5129SAndreas Dilger } 1288e50e5129SAndreas Dilger break; 1289e50e5129SAndreas Dilger } 1290e50e5129SAndreas Dilger } 1291e50e5129SAndreas Dilger 1292e50e5129SAndreas Dilger if (ret < 0) 1293e50e5129SAndreas Dilger return ret; 1294e50e5129SAndreas Dilger 1295e50e5129SAndreas Dilger block = 0; 1296e50e5129SAndreas Dilger while (wsize < bufsize) { 1297e50e5129SAndreas Dilger if (bh != NULL) 1298e50e5129SAndreas Dilger brelse(bh); 1299e50e5129SAndreas Dilger csize = (bufsize - wsize) > blocksize ? blocksize : 1300e50e5129SAndreas Dilger bufsize - wsize; 1301e50e5129SAndreas Dilger bh = ext4_getblk(handle, ea_inode, block, 0); 1302e50e5129SAndreas Dilger if (IS_ERR(bh)) 1303e50e5129SAndreas Dilger return PTR_ERR(bh); 1304e50e5129SAndreas Dilger ret = ext4_journal_get_write_access(handle, bh); 1305e50e5129SAndreas Dilger if (ret) 1306e50e5129SAndreas Dilger goto out; 1307e50e5129SAndreas Dilger 1308e50e5129SAndreas Dilger memcpy(bh->b_data, buf, csize); 1309e50e5129SAndreas Dilger set_buffer_uptodate(bh); 1310e50e5129SAndreas Dilger ext4_handle_dirty_metadata(handle, ea_inode, bh); 1311e50e5129SAndreas Dilger 1312e50e5129SAndreas Dilger buf += csize; 1313e50e5129SAndreas Dilger wsize += csize; 1314e50e5129SAndreas Dilger block += 1; 1315e50e5129SAndreas Dilger } 1316e50e5129SAndreas Dilger 1317e50e5129SAndreas Dilger inode_lock(ea_inode); 1318e50e5129SAndreas Dilger i_size_write(ea_inode, wsize); 1319e50e5129SAndreas Dilger ext4_update_i_disksize(ea_inode, wsize); 1320e50e5129SAndreas Dilger inode_unlock(ea_inode); 1321e50e5129SAndreas Dilger 1322e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1323e50e5129SAndreas Dilger 1324e50e5129SAndreas Dilger out: 1325e50e5129SAndreas Dilger brelse(bh); 1326e50e5129SAndreas Dilger 1327e50e5129SAndreas Dilger return ret; 1328e50e5129SAndreas Dilger } 1329e50e5129SAndreas Dilger 1330e50e5129SAndreas Dilger /* 1331e50e5129SAndreas Dilger * Create an inode to store the value of a large EA. 1332e50e5129SAndreas Dilger */ 1333e50e5129SAndreas Dilger static struct inode *ext4_xattr_inode_create(handle_t *handle, 1334dec214d0STahsin Erdogan struct inode *inode, u32 hash) 1335e50e5129SAndreas Dilger { 1336e50e5129SAndreas Dilger struct inode *ea_inode = NULL; 13379e1ba001STahsin Erdogan uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; 1338bd3b963bSTahsin Erdogan int err; 1339e50e5129SAndreas Dilger 1340e50e5129SAndreas Dilger /* 1341e50e5129SAndreas Dilger * Let the next inode be the goal, so we try and allocate the EA inode 1342e50e5129SAndreas Dilger * in the same group, or nearby one. 1343e50e5129SAndreas Dilger */ 1344e50e5129SAndreas Dilger ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, 13459e1ba001STahsin Erdogan S_IFREG | 0600, NULL, inode->i_ino + 1, owner, 13461b917ed8STahsin Erdogan EXT4_EA_INODE_FL); 1347e50e5129SAndreas Dilger if (!IS_ERR(ea_inode)) { 1348e50e5129SAndreas Dilger ea_inode->i_op = &ext4_file_inode_operations; 1349e50e5129SAndreas Dilger ea_inode->i_fop = &ext4_file_operations; 1350e50e5129SAndreas Dilger ext4_set_aops(ea_inode); 135133d201e0STahsin Erdogan ext4_xattr_inode_set_class(ea_inode); 1352e50e5129SAndreas Dilger unlock_new_inode(ea_inode); 1353dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, 1); 1354dec214d0STahsin Erdogan ext4_xattr_inode_set_hash(ea_inode, hash); 1355dec214d0STahsin Erdogan err = ext4_mark_inode_dirty(handle, ea_inode); 1356dec214d0STahsin Erdogan if (!err) 1357bd3b963bSTahsin Erdogan err = ext4_inode_attach_jinode(ea_inode); 1358bd3b963bSTahsin Erdogan if (err) { 1359bd3b963bSTahsin Erdogan iput(ea_inode); 1360bd3b963bSTahsin Erdogan return ERR_PTR(err); 1361bd3b963bSTahsin Erdogan } 1362dec214d0STahsin Erdogan 1363dec214d0STahsin Erdogan /* 1364dec214d0STahsin Erdogan * Xattr inodes are shared therefore quota charging is performed 1365dec214d0STahsin Erdogan * at a higher level. 1366dec214d0STahsin Erdogan */ 1367dec214d0STahsin Erdogan dquot_free_inode(ea_inode); 1368dec214d0STahsin Erdogan dquot_drop(ea_inode); 1369dec214d0STahsin Erdogan inode_lock(ea_inode); 1370dec214d0STahsin Erdogan ea_inode->i_flags |= S_NOQUOTA; 1371dec214d0STahsin Erdogan inode_unlock(ea_inode); 1372e50e5129SAndreas Dilger } 1373e50e5129SAndreas Dilger 1374e50e5129SAndreas Dilger return ea_inode; 1375e50e5129SAndreas Dilger } 1376e50e5129SAndreas Dilger 1377dec214d0STahsin Erdogan static struct inode * 1378dec214d0STahsin Erdogan ext4_xattr_inode_cache_find(struct inode *inode, const void *value, 1379dec214d0STahsin Erdogan size_t value_len, u32 hash) 1380e50e5129SAndreas Dilger { 1381dec214d0STahsin Erdogan struct inode *ea_inode; 1382dec214d0STahsin Erdogan struct mb_cache_entry *ce; 1383dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 1384dec214d0STahsin Erdogan void *ea_data; 1385e50e5129SAndreas Dilger 1386dec214d0STahsin Erdogan ce = mb_cache_entry_find_first(ea_inode_cache, hash); 1387dec214d0STahsin Erdogan if (!ce) 1388dec214d0STahsin Erdogan return NULL; 1389e50e5129SAndreas Dilger 1390dec214d0STahsin Erdogan ea_data = ext4_kvmalloc(value_len, GFP_NOFS); 1391dec214d0STahsin Erdogan if (!ea_data) { 1392dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1393dec214d0STahsin Erdogan return NULL; 1394dec214d0STahsin Erdogan } 1395dec214d0STahsin Erdogan 1396dec214d0STahsin Erdogan while (ce) { 1397dec214d0STahsin Erdogan ea_inode = ext4_iget(inode->i_sb, ce->e_value); 1398dec214d0STahsin Erdogan if (!IS_ERR(ea_inode) && 1399dec214d0STahsin Erdogan !is_bad_inode(ea_inode) && 1400dec214d0STahsin Erdogan (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && 1401dec214d0STahsin Erdogan i_size_read(ea_inode) == value_len && 1402dec214d0STahsin Erdogan !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && 1403dec214d0STahsin Erdogan !ext4_xattr_inode_verify_hash(ea_inode, ea_data, 1404dec214d0STahsin Erdogan value_len) && 1405dec214d0STahsin Erdogan !memcmp(value, ea_data, value_len)) { 1406dec214d0STahsin Erdogan mb_cache_entry_touch(ea_inode_cache, ce); 1407dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1408dec214d0STahsin Erdogan kvfree(ea_data); 1409dec214d0STahsin Erdogan return ea_inode; 1410dec214d0STahsin Erdogan } 1411dec214d0STahsin Erdogan 1412dec214d0STahsin Erdogan if (!IS_ERR(ea_inode)) 1413e50e5129SAndreas Dilger iput(ea_inode); 1414dec214d0STahsin Erdogan ce = mb_cache_entry_find_next(ea_inode_cache, ce); 1415dec214d0STahsin Erdogan } 1416dec214d0STahsin Erdogan kvfree(ea_data); 1417dec214d0STahsin Erdogan return NULL; 1418e50e5129SAndreas Dilger } 1419e50e5129SAndreas Dilger 1420e50e5129SAndreas Dilger /* 1421e50e5129SAndreas Dilger * Add value of the EA in an inode. 1422e50e5129SAndreas Dilger */ 1423dec214d0STahsin Erdogan static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, 1424dec214d0STahsin Erdogan const void *value, size_t value_len, 1425dec214d0STahsin Erdogan struct inode **ret_inode) 1426e50e5129SAndreas Dilger { 1427e50e5129SAndreas Dilger struct inode *ea_inode; 1428dec214d0STahsin Erdogan u32 hash; 1429e50e5129SAndreas Dilger int err; 1430e50e5129SAndreas Dilger 1431dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); 1432dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); 1433dec214d0STahsin Erdogan if (ea_inode) { 1434dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1435dec214d0STahsin Erdogan if (err) { 1436dec214d0STahsin Erdogan iput(ea_inode); 1437dec214d0STahsin Erdogan return err; 1438dec214d0STahsin Erdogan } 1439dec214d0STahsin Erdogan 1440dec214d0STahsin Erdogan *ret_inode = ea_inode; 1441dec214d0STahsin Erdogan return 0; 1442dec214d0STahsin Erdogan } 1443dec214d0STahsin Erdogan 1444e50e5129SAndreas Dilger /* Create an inode for the EA value */ 1445dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_create(handle, inode, hash); 1446e50e5129SAndreas Dilger if (IS_ERR(ea_inode)) 1447e50e5129SAndreas Dilger return PTR_ERR(ea_inode); 1448e50e5129SAndreas Dilger 1449e50e5129SAndreas Dilger err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); 1450dec214d0STahsin Erdogan if (err) { 1451dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref(handle, ea_inode); 1452e50e5129SAndreas Dilger iput(ea_inode); 1453e50e5129SAndreas Dilger return err; 1454e50e5129SAndreas Dilger } 1455e50e5129SAndreas Dilger 1456dec214d0STahsin Erdogan mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, 1457dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 1458dec214d0STahsin Erdogan 1459dec214d0STahsin Erdogan *ret_inode = ea_inode; 1460dec214d0STahsin Erdogan return 0; 1461dec214d0STahsin Erdogan } 1462dec214d0STahsin Erdogan 14639c6e7853STahsin Erdogan /* 14649c6e7853STahsin Erdogan * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode 14659c6e7853STahsin Erdogan * feature is enabled. 14669c6e7853STahsin Erdogan */ 14679c6e7853STahsin Erdogan #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) 14689c6e7853STahsin Erdogan 1469e50e5129SAndreas Dilger static int ext4_xattr_set_entry(struct ext4_xattr_info *i, 1470e50e5129SAndreas Dilger struct ext4_xattr_search *s, 1471*daf83281STahsin Erdogan handle_t *handle, struct inode *inode, 1472*daf83281STahsin Erdogan bool is_block) 1473ac27a0ecSDave Kleikamp { 1474617ba13bSMingming Cao struct ext4_xattr_entry *last; 1475dec214d0STahsin Erdogan struct ext4_xattr_entry *here = s->here; 1476dec214d0STahsin Erdogan size_t min_offs = s->end - s->base, name_len = strlen(i->name); 1477e50e5129SAndreas Dilger int in_inode = i->in_inode; 1478dec214d0STahsin Erdogan struct inode *old_ea_inode = NULL; 1479dec214d0STahsin Erdogan struct inode *new_ea_inode = NULL; 1480dec214d0STahsin Erdogan size_t old_size, new_size; 1481dec214d0STahsin Erdogan int ret; 1482dec214d0STahsin Erdogan 1483dec214d0STahsin Erdogan /* Space used by old and new values. */ 1484dec214d0STahsin Erdogan old_size = (!s->not_found && !here->e_value_inum) ? 1485dec214d0STahsin Erdogan EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; 1486dec214d0STahsin Erdogan new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; 1487dec214d0STahsin Erdogan 1488dec214d0STahsin Erdogan /* 1489dec214d0STahsin Erdogan * Optimization for the simple case when old and new values have the 1490dec214d0STahsin Erdogan * same padded sizes. Not applicable if external inodes are involved. 1491dec214d0STahsin Erdogan */ 1492dec214d0STahsin Erdogan if (new_size && new_size == old_size) { 1493dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1494dec214d0STahsin Erdogan void *val = s->base + offs; 1495dec214d0STahsin Erdogan 1496dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1497dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1498dec214d0STahsin Erdogan memset(val, 0, new_size); 1499dec214d0STahsin Erdogan } else { 1500dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1501dec214d0STahsin Erdogan /* Clear padding bytes. */ 1502dec214d0STahsin Erdogan memset(val + i->value_len, 0, new_size - i->value_len); 1503dec214d0STahsin Erdogan } 1504dec214d0STahsin Erdogan return 0; 1505dec214d0STahsin Erdogan } 1506e50e5129SAndreas Dilger 1507ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 1508ac27a0ecSDave Kleikamp last = s->first; 1509617ba13bSMingming Cao for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1510e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 1511ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 1512ac27a0ecSDave Kleikamp if (offs < min_offs) 1513ac27a0ecSDave Kleikamp min_offs = offs; 1514ac27a0ecSDave Kleikamp } 1515ac27a0ecSDave Kleikamp } 1516dec214d0STahsin Erdogan 1517dec214d0STahsin Erdogan /* Check whether we have enough space. */ 1518ac27a0ecSDave Kleikamp if (i->value) { 1519dec214d0STahsin Erdogan size_t free; 1520e50e5129SAndreas Dilger 1521dec214d0STahsin Erdogan free = min_offs - ((void *)last - s->base) - sizeof(__u32); 1522dec214d0STahsin Erdogan if (!s->not_found) 1523dec214d0STahsin Erdogan free += EXT4_XATTR_LEN(name_len) + old_size; 1524e50e5129SAndreas Dilger 1525dec214d0STahsin Erdogan if (free < EXT4_XATTR_LEN(name_len) + new_size) { 1526dec214d0STahsin Erdogan ret = -ENOSPC; 1527dec214d0STahsin Erdogan goto out; 1528dec214d0STahsin Erdogan } 15299c6e7853STahsin Erdogan 15309c6e7853STahsin Erdogan /* 15319c6e7853STahsin Erdogan * If storing the value in an external inode is an option, 15329c6e7853STahsin Erdogan * reserve space for xattr entries/names in the external 15339c6e7853STahsin Erdogan * attribute block so that a long value does not occupy the 15349c6e7853STahsin Erdogan * whole space and prevent futher entries being added. 15359c6e7853STahsin Erdogan */ 1536*daf83281STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 1537*daf83281STahsin Erdogan new_size && is_block && 15389c6e7853STahsin Erdogan (min_offs + old_size - new_size) < 15399c6e7853STahsin Erdogan EXT4_XATTR_BLOCK_RESERVE(inode)) { 15409c6e7853STahsin Erdogan ret = -ENOSPC; 15419c6e7853STahsin Erdogan goto out; 15429c6e7853STahsin Erdogan } 1543ac27a0ecSDave Kleikamp } 1544ac27a0ecSDave Kleikamp 1545dec214d0STahsin Erdogan /* 1546dec214d0STahsin Erdogan * Getting access to old and new ea inodes is subject to failures. 1547dec214d0STahsin Erdogan * Finish that work before doing any modifications to the xattr data. 1548dec214d0STahsin Erdogan */ 1549dec214d0STahsin Erdogan if (!s->not_found && here->e_value_inum) { 1550dec214d0STahsin Erdogan ret = ext4_xattr_inode_iget(inode, 1551dec214d0STahsin Erdogan le32_to_cpu(here->e_value_inum), 1552dec214d0STahsin Erdogan &old_ea_inode); 1553dec214d0STahsin Erdogan if (ret) { 1554dec214d0STahsin Erdogan old_ea_inode = NULL; 1555dec214d0STahsin Erdogan goto out; 1556bd9926e8STheodore Ts'o } 1557dec214d0STahsin Erdogan } 1558dec214d0STahsin Erdogan if (i->value && in_inode) { 1559dec214d0STahsin Erdogan WARN_ON_ONCE(!i->value_len); 1560dec214d0STahsin Erdogan 1561dec214d0STahsin Erdogan ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); 1562dec214d0STahsin Erdogan if (ret) 1563dec214d0STahsin Erdogan goto out; 1564dec214d0STahsin Erdogan 1565dec214d0STahsin Erdogan ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, 1566dec214d0STahsin Erdogan i->value_len, 1567dec214d0STahsin Erdogan &new_ea_inode); 1568dec214d0STahsin Erdogan if (ret) { 1569dec214d0STahsin Erdogan new_ea_inode = NULL; 1570dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, i->value_len); 1571dec214d0STahsin Erdogan goto out; 1572dec214d0STahsin Erdogan } 1573ac27a0ecSDave Kleikamp } 1574ac27a0ecSDave Kleikamp 1575dec214d0STahsin Erdogan if (old_ea_inode) { 1576dec214d0STahsin Erdogan /* We are ready to release ref count on the old_ea_inode. */ 1577dec214d0STahsin Erdogan ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); 1578dec214d0STahsin Erdogan if (ret) { 1579dec214d0STahsin Erdogan /* Release newly required ref count on new_ea_inode. */ 1580dec214d0STahsin Erdogan if (new_ea_inode) { 1581dec214d0STahsin Erdogan int err; 1582dec214d0STahsin Erdogan 1583dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, 1584dec214d0STahsin Erdogan new_ea_inode); 1585dec214d0STahsin Erdogan if (err) 1586dec214d0STahsin Erdogan ext4_warning_inode(new_ea_inode, 1587dec214d0STahsin Erdogan "dec ref new_ea_inode err=%d", 1588dec214d0STahsin Erdogan err); 1589dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 1590dec214d0STahsin Erdogan i->value_len); 1591dec214d0STahsin Erdogan } 1592dec214d0STahsin Erdogan goto out; 1593dec214d0STahsin Erdogan } 1594dec214d0STahsin Erdogan 1595dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 1596dec214d0STahsin Erdogan le32_to_cpu(here->e_value_size)); 1597dec214d0STahsin Erdogan } 1598dec214d0STahsin Erdogan 1599dec214d0STahsin Erdogan /* No failures allowed past this point. */ 1600dec214d0STahsin Erdogan 1601dec214d0STahsin Erdogan if (!s->not_found && here->e_value_offs) { 1602ac27a0ecSDave Kleikamp /* Remove the old value. */ 1603dec214d0STahsin Erdogan void *first_val = s->base + min_offs; 1604dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1605dec214d0STahsin Erdogan void *val = s->base + offs; 1606dec214d0STahsin Erdogan 1607dec214d0STahsin Erdogan memmove(first_val + old_size, first_val, val - first_val); 1608dec214d0STahsin Erdogan memset(first_val, 0, old_size); 1609dec214d0STahsin Erdogan min_offs += old_size; 1610ac27a0ecSDave Kleikamp 1611ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 1612ac27a0ecSDave Kleikamp last = s->first; 1613ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 1614ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 1615dec214d0STahsin Erdogan 1616e50e5129SAndreas Dilger if (!last->e_value_inum && 1617e50e5129SAndreas Dilger last->e_value_size && o < offs) 1618dec214d0STahsin Erdogan last->e_value_offs = cpu_to_le16(o + old_size); 1619617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 1620ac27a0ecSDave Kleikamp } 1621ac27a0ecSDave Kleikamp } 1622dec214d0STahsin Erdogan 1623ac27a0ecSDave Kleikamp if (!i->value) { 1624dec214d0STahsin Erdogan /* Remove old name. */ 1625617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 1626dec214d0STahsin Erdogan 1627ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 1628dec214d0STahsin Erdogan memmove(here, (void *)here + size, 1629dec214d0STahsin Erdogan (void *)last - (void *)here + sizeof(__u32)); 1630ac27a0ecSDave Kleikamp memset(last, 0, size); 1631dec214d0STahsin Erdogan } else if (s->not_found) { 1632dec214d0STahsin Erdogan /* Insert new name. */ 1633dec214d0STahsin Erdogan size_t size = EXT4_XATTR_LEN(name_len); 1634dec214d0STahsin Erdogan size_t rest = (void *)last - (void *)here + sizeof(__u32); 1635dec214d0STahsin Erdogan 1636dec214d0STahsin Erdogan memmove((void *)here + size, here, rest); 1637dec214d0STahsin Erdogan memset(here, 0, size); 1638dec214d0STahsin Erdogan here->e_name_index = i->name_index; 1639dec214d0STahsin Erdogan here->e_name_len = name_len; 1640dec214d0STahsin Erdogan memcpy(here->e_name, i->name, name_len); 1641dec214d0STahsin Erdogan } else { 1642dec214d0STahsin Erdogan /* This is an update, reset value info. */ 1643dec214d0STahsin Erdogan here->e_value_inum = 0; 1644dec214d0STahsin Erdogan here->e_value_offs = 0; 1645dec214d0STahsin Erdogan here->e_value_size = 0; 1646ac27a0ecSDave Kleikamp } 1647ac27a0ecSDave Kleikamp 1648ac27a0ecSDave Kleikamp if (i->value) { 1649dec214d0STahsin Erdogan /* Insert new value. */ 1650e50e5129SAndreas Dilger if (in_inode) { 1651dec214d0STahsin Erdogan here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); 1652e50e5129SAndreas Dilger } else if (i->value_len) { 1653dec214d0STahsin Erdogan void *val = s->base + min_offs - new_size; 1654e50e5129SAndreas Dilger 1655dec214d0STahsin Erdogan here->e_value_offs = cpu_to_le16(min_offs - new_size); 1656dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1657dec214d0STahsin Erdogan memset(val, 0, new_size); 1658dec214d0STahsin Erdogan } else { 1659dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1660dec214d0STahsin Erdogan /* Clear padding bytes. */ 1661dec214d0STahsin Erdogan memset(val + i->value_len, 0, 1662dec214d0STahsin Erdogan new_size - i->value_len); 1663dec214d0STahsin Erdogan } 1664dec214d0STahsin Erdogan } 1665dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1666dec214d0STahsin Erdogan } 1667*daf83281STahsin Erdogan 1668*daf83281STahsin Erdogan if (is_block) { 1669*daf83281STahsin Erdogan if (i->value) 1670*daf83281STahsin Erdogan ext4_xattr_hash_entry(here, s->base); 1671*daf83281STahsin Erdogan ext4_xattr_rehash((struct ext4_xattr_header *)s->base); 1672*daf83281STahsin Erdogan } 1673*daf83281STahsin Erdogan 1674dec214d0STahsin Erdogan ret = 0; 1675e50e5129SAndreas Dilger out: 1676dec214d0STahsin Erdogan iput(old_ea_inode); 1677dec214d0STahsin Erdogan iput(new_ea_inode); 1678dec214d0STahsin Erdogan return ret; 1679ac27a0ecSDave Kleikamp } 1680ac27a0ecSDave Kleikamp 1681617ba13bSMingming Cao struct ext4_xattr_block_find { 1682617ba13bSMingming Cao struct ext4_xattr_search s; 1683ac27a0ecSDave Kleikamp struct buffer_head *bh; 1684ac27a0ecSDave Kleikamp }; 1685ac27a0ecSDave Kleikamp 1686ac27a0ecSDave Kleikamp static int 1687617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 1688617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1689ac27a0ecSDave Kleikamp { 1690ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1691ac27a0ecSDave Kleikamp int error; 1692ac27a0ecSDave Kleikamp 1693ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 1694ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 1695ac27a0ecSDave Kleikamp 1696617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 1697ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 1698617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 1699ac27a0ecSDave Kleikamp error = -EIO; 1700ac27a0ecSDave Kleikamp if (!bs->bh) 1701ac27a0ecSDave Kleikamp goto cleanup; 1702ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 1703ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 1704ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 1705cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bs->bh)) { 170624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 170724676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 17086a797d27SDarrick J. Wong error = -EFSCORRUPTED; 1709ac27a0ecSDave Kleikamp goto cleanup; 1710ac27a0ecSDave Kleikamp } 1711ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1712ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 1713ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 1714ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 1715ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 1716617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 17176ba644b9SEric Biggers i->name, 1); 1718ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1719ac27a0ecSDave Kleikamp goto cleanup; 1720ac27a0ecSDave Kleikamp bs->s.not_found = error; 1721ac27a0ecSDave Kleikamp } 1722ac27a0ecSDave Kleikamp error = 0; 1723ac27a0ecSDave Kleikamp 1724ac27a0ecSDave Kleikamp cleanup: 1725ac27a0ecSDave Kleikamp return error; 1726ac27a0ecSDave Kleikamp } 1727ac27a0ecSDave Kleikamp 1728ac27a0ecSDave Kleikamp static int 1729617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 1730617ba13bSMingming Cao struct ext4_xattr_info *i, 1731617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1732ac27a0ecSDave Kleikamp { 1733ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1734ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 1735b347e2bcSTahsin Erdogan struct ext4_xattr_search s_copy = bs->s; 1736b347e2bcSTahsin Erdogan struct ext4_xattr_search *s = &s_copy; 17377a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 17388a2bfdcbSMingming Cao int error = 0; 173947387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 1740dec214d0STahsin Erdogan struct inode *ea_inode = NULL; 1741dec214d0STahsin Erdogan size_t old_ea_inode_size = 0; 1742ac27a0ecSDave Kleikamp 1743617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 1744ac27a0ecSDave Kleikamp 1745ac27a0ecSDave Kleikamp if (s->base) { 17465d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 17478a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 17488a2bfdcbSMingming Cao if (error) 17498a2bfdcbSMingming Cao goto cleanup; 17508a2bfdcbSMingming Cao lock_buffer(bs->bh); 17518a2bfdcbSMingming Cao 1752ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 175382939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 175482939d79SJan Kara 175582939d79SJan Kara /* 175682939d79SJan Kara * This must happen under buffer lock for 175782939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 175882939d79SJan Kara * block 175982939d79SJan Kara */ 176047387409STahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, 176182939d79SJan Kara bs->bh->b_blocknr); 1762ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 1763*daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 1764*daf83281STahsin Erdogan true /* is_block */); 1765*daf83281STahsin Erdogan if (!error) 176647387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, 17679c191f70ST Makphaibulchoke bs->bh); 1768dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bs->bh); 1769ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 17706a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1771ac27a0ecSDave Kleikamp goto bad_block; 1772ac27a0ecSDave Kleikamp if (!error) 1773dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 17740390131bSFrank Mayhar inode, 1775ac27a0ecSDave Kleikamp bs->bh); 1776ac27a0ecSDave Kleikamp if (error) 1777ac27a0ecSDave Kleikamp goto cleanup; 1778ac27a0ecSDave Kleikamp goto inserted; 1779ac27a0ecSDave Kleikamp } else { 1780ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 1781ac27a0ecSDave Kleikamp 17828a2bfdcbSMingming Cao unlock_buffer(bs->bh); 1783ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 1784216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 1785ac27a0ecSDave Kleikamp error = -ENOMEM; 1786ac27a0ecSDave Kleikamp if (s->base == NULL) 1787ac27a0ecSDave Kleikamp goto cleanup; 1788ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 1789ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1790ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1791ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 1792ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 1793dec214d0STahsin Erdogan 1794dec214d0STahsin Erdogan /* 1795dec214d0STahsin Erdogan * If existing entry points to an xattr inode, we need 1796dec214d0STahsin Erdogan * to prevent ext4_xattr_set_entry() from decrementing 1797dec214d0STahsin Erdogan * ref count on it because the reference belongs to the 1798dec214d0STahsin Erdogan * original block. In this case, make the entry look 1799dec214d0STahsin Erdogan * like it has an empty value. 1800dec214d0STahsin Erdogan */ 1801dec214d0STahsin Erdogan if (!s->not_found && s->here->e_value_inum) { 1802dec214d0STahsin Erdogan /* 1803dec214d0STahsin Erdogan * Defer quota free call for previous inode 1804dec214d0STahsin Erdogan * until success is guaranteed. 1805dec214d0STahsin Erdogan */ 1806dec214d0STahsin Erdogan old_ea_inode_size = le32_to_cpu( 1807dec214d0STahsin Erdogan s->here->e_value_size); 1808dec214d0STahsin Erdogan s->here->e_value_inum = 0; 1809dec214d0STahsin Erdogan s->here->e_value_size = 0; 1810dec214d0STahsin Erdogan } 1811ac27a0ecSDave Kleikamp } 1812ac27a0ecSDave Kleikamp } else { 1813ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 1814216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 1815ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 1816ac27a0ecSDave Kleikamp error = -ENOMEM; 1817ac27a0ecSDave Kleikamp if (s->base == NULL) 1818ac27a0ecSDave Kleikamp goto cleanup; 1819617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 1820ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 1821ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1822ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1823ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 1824ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 1825ac27a0ecSDave Kleikamp } 1826ac27a0ecSDave Kleikamp 1827*daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); 18286a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1829ac27a0ecSDave Kleikamp goto bad_block; 1830ac27a0ecSDave Kleikamp if (error) 1831ac27a0ecSDave Kleikamp goto cleanup; 1832dec214d0STahsin Erdogan 1833dec214d0STahsin Erdogan if (i->value && s->here->e_value_inum) { 1834dec214d0STahsin Erdogan unsigned int ea_ino; 1835dec214d0STahsin Erdogan 1836dec214d0STahsin Erdogan /* 1837dec214d0STahsin Erdogan * A ref count on ea_inode has been taken as part of the call to 1838dec214d0STahsin Erdogan * ext4_xattr_set_entry() above. We would like to drop this 1839dec214d0STahsin Erdogan * extra ref but we have to wait until the xattr block is 1840dec214d0STahsin Erdogan * initialized and has its own ref count on the ea_inode. 1841dec214d0STahsin Erdogan */ 1842dec214d0STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 1843dec214d0STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, &ea_inode); 1844dec214d0STahsin Erdogan if (error) { 1845dec214d0STahsin Erdogan ea_inode = NULL; 1846dec214d0STahsin Erdogan goto cleanup; 1847dec214d0STahsin Erdogan } 1848dec214d0STahsin Erdogan } 1849dec214d0STahsin Erdogan 1850ac27a0ecSDave Kleikamp inserted: 1851ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 185247387409STahsin Erdogan new_bh = ext4_xattr_block_cache_find(inode, header(s->base), 185347387409STahsin Erdogan &ce); 1854ac27a0ecSDave Kleikamp if (new_bh) { 1855ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 1856ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 1857ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 1858ac27a0ecSDave Kleikamp else { 18596048c64bSAndreas Gruenbacher u32 ref; 18606048c64bSAndreas Gruenbacher 1861b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 1862b8cb5a54STahsin Erdogan 1863ac27a0ecSDave Kleikamp /* The old block is released after updating 1864ac27a0ecSDave Kleikamp the inode. */ 18651231b3a1SLukas Czerner error = dquot_alloc_block(inode, 18661231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 18675dd4056dSChristoph Hellwig if (error) 1868ac27a0ecSDave Kleikamp goto cleanup; 18695d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 1870617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 1871ac27a0ecSDave Kleikamp new_bh); 1872ac27a0ecSDave Kleikamp if (error) 1873ac27a0ecSDave Kleikamp goto cleanup_dquot; 1874ac27a0ecSDave Kleikamp lock_buffer(new_bh); 187582939d79SJan Kara /* 187682939d79SJan Kara * We have to be careful about races with 18776048c64bSAndreas Gruenbacher * freeing, rehashing or adding references to 18786048c64bSAndreas Gruenbacher * xattr block. Once we hold buffer lock xattr 18796048c64bSAndreas Gruenbacher * block's state is stable so we can check 18806048c64bSAndreas Gruenbacher * whether the block got freed / rehashed or 18816048c64bSAndreas Gruenbacher * not. Since we unhash mbcache entry under 18826048c64bSAndreas Gruenbacher * buffer lock when freeing / rehashing xattr 18836048c64bSAndreas Gruenbacher * block, checking whether entry is still 18846048c64bSAndreas Gruenbacher * hashed is reliable. Same rules hold for 18856048c64bSAndreas Gruenbacher * e_reusable handling. 188682939d79SJan Kara */ 18876048c64bSAndreas Gruenbacher if (hlist_bl_unhashed(&ce->e_hash_list) || 18886048c64bSAndreas Gruenbacher !ce->e_reusable) { 188982939d79SJan Kara /* 189082939d79SJan Kara * Undo everything and check mbcache 189182939d79SJan Kara * again. 189282939d79SJan Kara */ 189382939d79SJan Kara unlock_buffer(new_bh); 189482939d79SJan Kara dquot_free_block(inode, 189582939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 189682939d79SJan Kara 1)); 189782939d79SJan Kara brelse(new_bh); 189847387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 189982939d79SJan Kara ce = NULL; 190082939d79SJan Kara new_bh = NULL; 190182939d79SJan Kara goto inserted; 190282939d79SJan Kara } 19036048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 19046048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 19056048c64bSAndreas Gruenbacher if (ref >= EXT4_XATTR_REFCOUNT_MAX) 19066048c64bSAndreas Gruenbacher ce->e_reusable = 0; 1907ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 19086048c64bSAndreas Gruenbacher ref); 1909dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 1910ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 1911dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 19120390131bSFrank Mayhar inode, 1913ac27a0ecSDave Kleikamp new_bh); 1914ac27a0ecSDave Kleikamp if (error) 1915ac27a0ecSDave Kleikamp goto cleanup_dquot; 1916ac27a0ecSDave Kleikamp } 191747387409STahsin Erdogan mb_cache_entry_touch(ea_block_cache, ce); 191847387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 1919ac27a0ecSDave Kleikamp ce = NULL; 1920ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 1921ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 1922ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 1923ac27a0ecSDave Kleikamp new_bh = bs->bh; 1924ac27a0ecSDave Kleikamp get_bh(new_bh); 1925ac27a0ecSDave Kleikamp } else { 1926ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 1927fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 1928fb0a387dSEric Sandeen 1929b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 1930b8cb5a54STahsin Erdogan 1931fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 1932d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 1933fb0a387dSEric Sandeen 1934fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 193512e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 1936fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 1937fb0a387dSEric Sandeen 193855f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 193955f020dbSAllison Henderson NULL, &error); 1940ac27a0ecSDave Kleikamp if (error) 1941ac27a0ecSDave Kleikamp goto cleanup; 1942fb0a387dSEric Sandeen 194312e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 1944fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 1945fb0a387dSEric Sandeen 1946ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 1947ace36ad4SJoe Perches (unsigned long long)block); 1948ac27a0ecSDave Kleikamp 1949ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 1950aebf0243SWang Shilong if (unlikely(!new_bh)) { 1951860d21e2STheodore Ts'o error = -ENOMEM; 1952ac27a0ecSDave Kleikamp getblk_failed: 19537dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 1954e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 1955ac27a0ecSDave Kleikamp goto cleanup; 1956ac27a0ecSDave Kleikamp } 1957dec214d0STahsin Erdogan error = ext4_xattr_inode_inc_ref_all(handle, inode, 1958dec214d0STahsin Erdogan ENTRY(header(s->base)+1)); 1959dec214d0STahsin Erdogan if (error) 1960dec214d0STahsin Erdogan goto getblk_failed; 1961dec214d0STahsin Erdogan if (ea_inode) { 1962dec214d0STahsin Erdogan /* Drop the extra ref on ea_inode. */ 1963dec214d0STahsin Erdogan error = ext4_xattr_inode_dec_ref(handle, 1964dec214d0STahsin Erdogan ea_inode); 1965dec214d0STahsin Erdogan if (error) 1966dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 1967dec214d0STahsin Erdogan "dec ref error=%d", 1968dec214d0STahsin Erdogan error); 1969dec214d0STahsin Erdogan iput(ea_inode); 1970dec214d0STahsin Erdogan ea_inode = NULL; 1971dec214d0STahsin Erdogan } 1972dec214d0STahsin Erdogan 1973ac27a0ecSDave Kleikamp lock_buffer(new_bh); 1974617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 1975ac27a0ecSDave Kleikamp if (error) { 1976ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 1977860d21e2STheodore Ts'o error = -EIO; 1978ac27a0ecSDave Kleikamp goto getblk_failed; 1979ac27a0ecSDave Kleikamp } 1980ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 1981dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 1982ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 1983ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 198447387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, new_bh); 1985dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, 1986dac7a4b4STheodore Ts'o new_bh); 1987ac27a0ecSDave Kleikamp if (error) 1988ac27a0ecSDave Kleikamp goto cleanup; 1989ac27a0ecSDave Kleikamp } 1990ac27a0ecSDave Kleikamp } 1991ac27a0ecSDave Kleikamp 1992dec214d0STahsin Erdogan if (old_ea_inode_size) 1993dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, old_ea_inode_size); 1994dec214d0STahsin Erdogan 1995ac27a0ecSDave Kleikamp /* Update the inode. */ 1996617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 1997ac27a0ecSDave Kleikamp 1998ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 1999dec214d0STahsin Erdogan if (bs->bh && bs->bh != new_bh) { 2000dec214d0STahsin Erdogan struct ext4_xattr_inode_array *ea_inode_array = NULL; 2001dec214d0STahsin Erdogan 2002dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bs->bh, 2003dec214d0STahsin Erdogan &ea_inode_array, 2004dec214d0STahsin Erdogan 0 /* extra_credits */); 2005dec214d0STahsin Erdogan ext4_xattr_inode_array_free(ea_inode_array); 2006dec214d0STahsin Erdogan } 2007ac27a0ecSDave Kleikamp error = 0; 2008ac27a0ecSDave Kleikamp 2009ac27a0ecSDave Kleikamp cleanup: 2010dec214d0STahsin Erdogan if (ea_inode) { 2011dec214d0STahsin Erdogan int error2; 2012dec214d0STahsin Erdogan 2013dec214d0STahsin Erdogan error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); 2014dec214d0STahsin Erdogan if (error2) 2015dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "dec ref error=%d", 2016dec214d0STahsin Erdogan error2); 2017dec214d0STahsin Erdogan 2018dec214d0STahsin Erdogan /* If there was an error, revert the quota charge. */ 2019dec214d0STahsin Erdogan if (error) 2020dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 2021dec214d0STahsin Erdogan i_size_read(ea_inode)); 2022dec214d0STahsin Erdogan iput(ea_inode); 2023dec214d0STahsin Erdogan } 2024ac27a0ecSDave Kleikamp if (ce) 202547387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2026ac27a0ecSDave Kleikamp brelse(new_bh); 2027ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 2028ac27a0ecSDave Kleikamp kfree(s->base); 2029ac27a0ecSDave Kleikamp 2030ac27a0ecSDave Kleikamp return error; 2031ac27a0ecSDave Kleikamp 2032ac27a0ecSDave Kleikamp cleanup_dquot: 20331231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 2034ac27a0ecSDave Kleikamp goto cleanup; 2035ac27a0ecSDave Kleikamp 2036ac27a0ecSDave Kleikamp bad_block: 203724676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 203824676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2039ac27a0ecSDave Kleikamp goto cleanup; 2040ac27a0ecSDave Kleikamp 2041ac27a0ecSDave Kleikamp #undef header 2042ac27a0ecSDave Kleikamp } 2043ac27a0ecSDave Kleikamp 2044879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 2045617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2046ac27a0ecSDave Kleikamp { 2047617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2048617ba13bSMingming Cao struct ext4_inode *raw_inode; 2049ac27a0ecSDave Kleikamp int error; 2050ac27a0ecSDave Kleikamp 2051617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 2052ac27a0ecSDave Kleikamp return 0; 2053617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 2054ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 2055ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 2056ac27a0ecSDave Kleikamp is->s.here = is->s.first; 2057617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 205819f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 20599e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 2060ac27a0ecSDave Kleikamp if (error) 2061ac27a0ecSDave Kleikamp return error; 2062ac27a0ecSDave Kleikamp /* Find the named attribute. */ 2063617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 20646ba644b9SEric Biggers i->name, 0); 2065ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 2066ac27a0ecSDave Kleikamp return error; 2067ac27a0ecSDave Kleikamp is->s.not_found = error; 2068ac27a0ecSDave Kleikamp } 2069ac27a0ecSDave Kleikamp return 0; 2070ac27a0ecSDave Kleikamp } 2071ac27a0ecSDave Kleikamp 20720d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 20730d812f77STao Ma struct ext4_xattr_info *i, 20740d812f77STao Ma struct ext4_xattr_ibody_find *is) 20750d812f77STao Ma { 20760d812f77STao Ma struct ext4_xattr_ibody_header *header; 20770d812f77STao Ma struct ext4_xattr_search *s = &is->s; 20780d812f77STao Ma int error; 20790d812f77STao Ma 20800d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 20810d812f77STao Ma return -ENOSPC; 2082*daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 20830d812f77STao Ma if (error) { 20840d812f77STao Ma if (error == -ENOSPC && 20850d812f77STao Ma ext4_has_inline_data(inode)) { 20860d812f77STao Ma error = ext4_try_to_evict_inline_data(handle, inode, 20870d812f77STao Ma EXT4_XATTR_LEN(strlen(i->name) + 20880d812f77STao Ma EXT4_XATTR_SIZE(i->value_len))); 20890d812f77STao Ma if (error) 20900d812f77STao Ma return error; 20910d812f77STao Ma error = ext4_xattr_ibody_find(inode, i, is); 20920d812f77STao Ma if (error) 20930d812f77STao Ma return error; 2094*daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 2095*daf83281STahsin Erdogan false /* is_block */); 20960d812f77STao Ma } 20970d812f77STao Ma if (error) 20980d812f77STao Ma return error; 20990d812f77STao Ma } 21000d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 21010d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 21020d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 21030d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 21040d812f77STao Ma } else { 21050d812f77STao Ma header->h_magic = cpu_to_le32(0); 21060d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 21070d812f77STao Ma } 21080d812f77STao Ma return 0; 21090d812f77STao Ma } 21100d812f77STao Ma 2111e50e5129SAndreas Dilger static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 2112617ba13bSMingming Cao struct ext4_xattr_info *i, 2113617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2114ac27a0ecSDave Kleikamp { 2115617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2116617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 2117ac27a0ecSDave Kleikamp int error; 2118ac27a0ecSDave Kleikamp 2119617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 2120ac27a0ecSDave Kleikamp return -ENOSPC; 2121*daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 2122ac27a0ecSDave Kleikamp if (error) 2123ac27a0ecSDave Kleikamp return error; 2124617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 2125ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 2126617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 212719f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 2128ac27a0ecSDave Kleikamp } else { 2129ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 213019f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 2131ac27a0ecSDave Kleikamp } 2132ac27a0ecSDave Kleikamp return 0; 2133ac27a0ecSDave Kleikamp } 2134ac27a0ecSDave Kleikamp 21353fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 21363fd16462SJan Kara struct ext4_xattr_info *i) 21373fd16462SJan Kara { 21383fd16462SJan Kara void *value; 21393fd16462SJan Kara 21400bd454c0STahsin Erdogan /* When e_value_inum is set the value is stored externally. */ 21410bd454c0STahsin Erdogan if (s->here->e_value_inum) 21420bd454c0STahsin Erdogan return 0; 21433fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 21443fd16462SJan Kara return 0; 21453fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 21463fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 21473fd16462SJan Kara } 21483fd16462SJan Kara 2149dec214d0STahsin Erdogan static struct buffer_head *ext4_xattr_get_block(struct inode *inode) 2150dec214d0STahsin Erdogan { 2151dec214d0STahsin Erdogan struct buffer_head *bh; 2152dec214d0STahsin Erdogan int error; 2153dec214d0STahsin Erdogan 2154dec214d0STahsin Erdogan if (!EXT4_I(inode)->i_file_acl) 2155dec214d0STahsin Erdogan return NULL; 2156dec214d0STahsin Erdogan bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 2157dec214d0STahsin Erdogan if (!bh) 2158dec214d0STahsin Erdogan return ERR_PTR(-EIO); 2159dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2160dec214d0STahsin Erdogan if (error) 2161dec214d0STahsin Erdogan return ERR_PTR(error); 2162dec214d0STahsin Erdogan return bh; 2163dec214d0STahsin Erdogan } 2164dec214d0STahsin Erdogan 2165ac27a0ecSDave Kleikamp /* 2166617ba13bSMingming Cao * ext4_xattr_set_handle() 2167ac27a0ecSDave Kleikamp * 21686e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 2169ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 2170ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 2171ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 2172ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 2173ac27a0ecSDave Kleikamp * previous to the call, respectively. 2174ac27a0ecSDave Kleikamp * 2175ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2176ac27a0ecSDave Kleikamp */ 2177ac27a0ecSDave Kleikamp int 2178617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 2179ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 2180ac27a0ecSDave Kleikamp int flags) 2181ac27a0ecSDave Kleikamp { 2182617ba13bSMingming Cao struct ext4_xattr_info i = { 2183ac27a0ecSDave Kleikamp .name_index = name_index, 2184ac27a0ecSDave Kleikamp .name = name, 2185ac27a0ecSDave Kleikamp .value = value, 2186ac27a0ecSDave Kleikamp .value_len = value_len, 2187e50e5129SAndreas Dilger .in_inode = 0, 2188ac27a0ecSDave Kleikamp }; 2189617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 2190ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2191ac27a0ecSDave Kleikamp }; 2192617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 2193ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2194ac27a0ecSDave Kleikamp }; 2195c755e251STheodore Ts'o int no_expand; 2196ac27a0ecSDave Kleikamp int error; 2197ac27a0ecSDave Kleikamp 2198ac27a0ecSDave Kleikamp if (!name) 2199ac27a0ecSDave Kleikamp return -EINVAL; 2200ac27a0ecSDave Kleikamp if (strlen(name) > 255) 2201ac27a0ecSDave Kleikamp return -ERANGE; 2202b8cb5a54STahsin Erdogan 2203c755e251STheodore Ts'o ext4_write_lock_xattr(inode, &no_expand); 22044d20c685SKalpak Shah 2205c1a5d5f6STahsin Erdogan /* Check journal credits under write lock. */ 2206c1a5d5f6STahsin Erdogan if (ext4_handle_valid(handle)) { 2207dec214d0STahsin Erdogan struct buffer_head *bh; 2208c1a5d5f6STahsin Erdogan int credits; 2209c1a5d5f6STahsin Erdogan 2210dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2211dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2212dec214d0STahsin Erdogan error = PTR_ERR(bh); 2213dec214d0STahsin Erdogan goto cleanup; 2214dec214d0STahsin Erdogan } 2215dec214d0STahsin Erdogan 2216dec214d0STahsin Erdogan credits = __ext4_xattr_set_credits(inode, bh, value_len); 2217dec214d0STahsin Erdogan brelse(bh); 2218dec214d0STahsin Erdogan 2219c1a5d5f6STahsin Erdogan if (!ext4_handle_has_enough_credits(handle, credits)) { 2220c1a5d5f6STahsin Erdogan error = -ENOSPC; 2221c1a5d5f6STahsin Erdogan goto cleanup; 2222c1a5d5f6STahsin Erdogan } 2223c1a5d5f6STahsin Erdogan } 2224c1a5d5f6STahsin Erdogan 222566543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 222686ebfd08SEric Sandeen if (error) 222786ebfd08SEric Sandeen goto cleanup; 222886ebfd08SEric Sandeen 222919f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 2230617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 2231617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 223219f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 2233ac27a0ecSDave Kleikamp } 2234ac27a0ecSDave Kleikamp 2235617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 2236ac27a0ecSDave Kleikamp if (error) 2237ac27a0ecSDave Kleikamp goto cleanup; 2238ac27a0ecSDave Kleikamp if (is.s.not_found) 2239617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 2240ac27a0ecSDave Kleikamp if (error) 2241ac27a0ecSDave Kleikamp goto cleanup; 2242ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 2243ac27a0ecSDave Kleikamp error = -ENODATA; 2244ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 2245ac27a0ecSDave Kleikamp goto cleanup; 2246ac27a0ecSDave Kleikamp error = 0; 2247ac27a0ecSDave Kleikamp if (!value) 2248ac27a0ecSDave Kleikamp goto cleanup; 2249ac27a0ecSDave Kleikamp } else { 2250ac27a0ecSDave Kleikamp error = -EEXIST; 2251ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 2252ac27a0ecSDave Kleikamp goto cleanup; 2253ac27a0ecSDave Kleikamp } 2254dec214d0STahsin Erdogan 2255ac27a0ecSDave Kleikamp if (!value) { 2256ac27a0ecSDave Kleikamp if (!is.s.not_found) 2257e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2258ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 2259617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2260ac27a0ecSDave Kleikamp } else { 22613fd16462SJan Kara error = 0; 22623fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 22633fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 22643fd16462SJan Kara goto cleanup; 22653fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 22663fd16462SJan Kara goto cleanup; 22673fd16462SJan Kara 2268b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2269b347e2bcSTahsin Erdogan (EXT4_XATTR_SIZE(i.value_len) > 2270b347e2bcSTahsin Erdogan EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) 2271b347e2bcSTahsin Erdogan i.in_inode = 1; 2272b347e2bcSTahsin Erdogan retry_inode: 2273e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2274ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 2275ac27a0ecSDave Kleikamp i.value = NULL; 2276617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2277ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 22787e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 22797e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 22807e01c8e5STiger Yang if (error) 22817e01c8e5STiger Yang goto cleanup; 22827e01c8e5STiger Yang } 2283617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2284b347e2bcSTahsin Erdogan if (!error && !is.s.not_found) { 2285ac27a0ecSDave Kleikamp i.value = NULL; 2286e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, 2287e50e5129SAndreas Dilger &is); 2288b347e2bcSTahsin Erdogan } else if (error == -ENOSPC) { 2289b347e2bcSTahsin Erdogan /* 2290b347e2bcSTahsin Erdogan * Xattr does not fit in the block, store at 2291b347e2bcSTahsin Erdogan * external inode if possible. 2292b347e2bcSTahsin Erdogan */ 2293b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2294b347e2bcSTahsin Erdogan !i.in_inode) { 2295b347e2bcSTahsin Erdogan i.in_inode = 1; 2296b347e2bcSTahsin Erdogan goto retry_inode; 2297b347e2bcSTahsin Erdogan } 2298ac27a0ecSDave Kleikamp } 2299ac27a0ecSDave Kleikamp } 2300ac27a0ecSDave Kleikamp } 2301ac27a0ecSDave Kleikamp if (!error) { 2302617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 2303eeca7ea1SDeepa Dinamani inode->i_ctime = current_time(inode); 23046dd4ee7cSKalpak Shah if (!value) 2305c755e251STheodore Ts'o no_expand = 0; 2306617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 2307ac27a0ecSDave Kleikamp /* 2308617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 2309ac27a0ecSDave Kleikamp * error != 0. 2310ac27a0ecSDave Kleikamp */ 2311ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 2312ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 23130390131bSFrank Mayhar ext4_handle_sync(handle); 2314ac27a0ecSDave Kleikamp } 2315ac27a0ecSDave Kleikamp 2316ac27a0ecSDave Kleikamp cleanup: 2317ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 2318ac27a0ecSDave Kleikamp brelse(bs.bh); 2319c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 2320ac27a0ecSDave Kleikamp return error; 2321ac27a0ecSDave Kleikamp } 2322ac27a0ecSDave Kleikamp 2323dec214d0STahsin Erdogan int ext4_xattr_set_credits(struct inode *inode, size_t value_len, int *credits) 2324c1a5d5f6STahsin Erdogan { 2325dec214d0STahsin Erdogan struct buffer_head *bh; 2326dec214d0STahsin Erdogan int err; 2327c1a5d5f6STahsin Erdogan 2328dec214d0STahsin Erdogan *credits = 0; 2329dec214d0STahsin Erdogan 2330dec214d0STahsin Erdogan if (!EXT4_SB(inode->i_sb)->s_journal) 2331c1a5d5f6STahsin Erdogan return 0; 2332c1a5d5f6STahsin Erdogan 2333dec214d0STahsin Erdogan down_read(&EXT4_I(inode)->xattr_sem); 2334c1a5d5f6STahsin Erdogan 2335dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2336dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2337dec214d0STahsin Erdogan err = PTR_ERR(bh); 2338dec214d0STahsin Erdogan } else { 2339dec214d0STahsin Erdogan *credits = __ext4_xattr_set_credits(inode, bh, value_len); 2340dec214d0STahsin Erdogan brelse(bh); 2341dec214d0STahsin Erdogan err = 0; 2342c1a5d5f6STahsin Erdogan } 2343dec214d0STahsin Erdogan 2344dec214d0STahsin Erdogan up_read(&EXT4_I(inode)->xattr_sem); 2345dec214d0STahsin Erdogan return err; 2346c1a5d5f6STahsin Erdogan } 2347c1a5d5f6STahsin Erdogan 2348ac27a0ecSDave Kleikamp /* 2349617ba13bSMingming Cao * ext4_xattr_set() 2350ac27a0ecSDave Kleikamp * 2351617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 2352ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 2353ac27a0ecSDave Kleikamp * 2354ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2355ac27a0ecSDave Kleikamp */ 2356ac27a0ecSDave Kleikamp int 2357617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 2358ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 2359ac27a0ecSDave Kleikamp { 2360ac27a0ecSDave Kleikamp handle_t *handle; 2361e50e5129SAndreas Dilger struct super_block *sb = inode->i_sb; 2362ac27a0ecSDave Kleikamp int error, retries = 0; 2363c1a5d5f6STahsin Erdogan int credits; 2364ac27a0ecSDave Kleikamp 2365b8cb5a54STahsin Erdogan error = dquot_initialize(inode); 2366b8cb5a54STahsin Erdogan if (error) 2367b8cb5a54STahsin Erdogan return error; 2368e50e5129SAndreas Dilger 2369ac27a0ecSDave Kleikamp retry: 2370dec214d0STahsin Erdogan error = ext4_xattr_set_credits(inode, value_len, &credits); 2371dec214d0STahsin Erdogan if (error) 2372dec214d0STahsin Erdogan return error; 2373dec214d0STahsin Erdogan 23749924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 2375ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 2376ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 2377ac27a0ecSDave Kleikamp } else { 2378ac27a0ecSDave Kleikamp int error2; 2379ac27a0ecSDave Kleikamp 2380617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 2381ac27a0ecSDave Kleikamp value, value_len, flags); 2382617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 2383ac27a0ecSDave Kleikamp if (error == -ENOSPC && 2384e50e5129SAndreas Dilger ext4_should_retry_alloc(sb, &retries)) 2385ac27a0ecSDave Kleikamp goto retry; 2386ac27a0ecSDave Kleikamp if (error == 0) 2387ac27a0ecSDave Kleikamp error = error2; 2388ac27a0ecSDave Kleikamp } 2389ac27a0ecSDave Kleikamp 2390ac27a0ecSDave Kleikamp return error; 2391ac27a0ecSDave Kleikamp } 2392ac27a0ecSDave Kleikamp 2393ac27a0ecSDave Kleikamp /* 23946dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 23956dd4ee7cSKalpak Shah * i_extra_isize. 23966dd4ee7cSKalpak Shah */ 23976dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 23986dd4ee7cSKalpak Shah int value_offs_shift, void *to, 239994405713SJan Kara void *from, size_t n) 24006dd4ee7cSKalpak Shah { 24016dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 24026dd4ee7cSKalpak Shah int new_offs; 24036dd4ee7cSKalpak Shah 240494405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 240594405713SJan Kara BUG_ON(value_offs_shift > 0); 240694405713SJan Kara 24076dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 24086dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 2409e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 24106dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 24116dd4ee7cSKalpak Shah value_offs_shift; 24126dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 24136dd4ee7cSKalpak Shah } 24146dd4ee7cSKalpak Shah } 24156dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 24166dd4ee7cSKalpak Shah memmove(to, from, n); 24176dd4ee7cSKalpak Shah } 24186dd4ee7cSKalpak Shah 24196dd4ee7cSKalpak Shah /* 24203f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 24213f2571c1SJan Kara */ 24223f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 24233f2571c1SJan Kara struct ext4_inode *raw_inode, 24243f2571c1SJan Kara struct ext4_xattr_entry *entry) 24253f2571c1SJan Kara { 24263f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 24273f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 24283f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 2429f6109100STahsin Erdogan size_t value_size = le32_to_cpu(entry->e_value_size); 24303f2571c1SJan Kara struct ext4_xattr_info i = { 24313f2571c1SJan Kara .value = NULL, 24323f2571c1SJan Kara .value_len = 0, 24333f2571c1SJan Kara .name_index = entry->e_name_index, 2434f6109100STahsin Erdogan .in_inode = !!entry->e_value_inum, 24353f2571c1SJan Kara }; 24363f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 24373f2571c1SJan Kara int error; 24383f2571c1SJan Kara 24393f2571c1SJan Kara is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 24403f2571c1SJan Kara bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 24413f2571c1SJan Kara buffer = kmalloc(value_size, GFP_NOFS); 24423f2571c1SJan Kara b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 24433f2571c1SJan Kara if (!is || !bs || !buffer || !b_entry_name) { 24443f2571c1SJan Kara error = -ENOMEM; 24453f2571c1SJan Kara goto out; 24463f2571c1SJan Kara } 24473f2571c1SJan Kara 24483f2571c1SJan Kara is->s.not_found = -ENODATA; 24493f2571c1SJan Kara bs->s.not_found = -ENODATA; 24503f2571c1SJan Kara is->iloc.bh = NULL; 24513f2571c1SJan Kara bs->bh = NULL; 24523f2571c1SJan Kara 24533f2571c1SJan Kara /* Save the entry name and the entry value */ 2454f6109100STahsin Erdogan if (entry->e_value_inum) { 2455f6109100STahsin Erdogan error = ext4_xattr_inode_get(inode, 2456f6109100STahsin Erdogan le32_to_cpu(entry->e_value_inum), 2457f6109100STahsin Erdogan buffer, value_size); 2458f6109100STahsin Erdogan if (error) 2459f6109100STahsin Erdogan goto out; 2460f6109100STahsin Erdogan } else { 2461f6109100STahsin Erdogan size_t value_offs = le16_to_cpu(entry->e_value_offs); 24623f2571c1SJan Kara memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); 2463f6109100STahsin Erdogan } 2464f6109100STahsin Erdogan 24653f2571c1SJan Kara memcpy(b_entry_name, entry->e_name, entry->e_name_len); 24663f2571c1SJan Kara b_entry_name[entry->e_name_len] = '\0'; 24673f2571c1SJan Kara i.name = b_entry_name; 24683f2571c1SJan Kara 24693f2571c1SJan Kara error = ext4_get_inode_loc(inode, &is->iloc); 24703f2571c1SJan Kara if (error) 24713f2571c1SJan Kara goto out; 24723f2571c1SJan Kara 24733f2571c1SJan Kara error = ext4_xattr_ibody_find(inode, &i, is); 24743f2571c1SJan Kara if (error) 24753f2571c1SJan Kara goto out; 24763f2571c1SJan Kara 24773f2571c1SJan Kara /* Remove the chosen entry from the inode */ 2478e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, is); 24793f2571c1SJan Kara if (error) 24803f2571c1SJan Kara goto out; 24813f2571c1SJan Kara 24823f2571c1SJan Kara i.value = buffer; 24833f2571c1SJan Kara i.value_len = value_size; 24843f2571c1SJan Kara error = ext4_xattr_block_find(inode, &i, bs); 24853f2571c1SJan Kara if (error) 24863f2571c1SJan Kara goto out; 24873f2571c1SJan Kara 24883f2571c1SJan Kara /* Add entry which was removed from the inode into the block */ 24893f2571c1SJan Kara error = ext4_xattr_block_set(handle, inode, &i, bs); 24903f2571c1SJan Kara if (error) 24913f2571c1SJan Kara goto out; 24923f2571c1SJan Kara error = 0; 24933f2571c1SJan Kara out: 24943f2571c1SJan Kara kfree(b_entry_name); 24953f2571c1SJan Kara kfree(buffer); 24963f2571c1SJan Kara if (is) 24973f2571c1SJan Kara brelse(is->iloc.bh); 24983f2571c1SJan Kara kfree(is); 24993f2571c1SJan Kara kfree(bs); 25003f2571c1SJan Kara 25013f2571c1SJan Kara return error; 25023f2571c1SJan Kara } 25033f2571c1SJan Kara 2504dfa2064bSJan Kara static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, 2505dfa2064bSJan Kara struct ext4_inode *raw_inode, 2506dfa2064bSJan Kara int isize_diff, size_t ifree, 2507dfa2064bSJan Kara size_t bfree, int *total_ino) 2508dfa2064bSJan Kara { 2509dfa2064bSJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 2510dfa2064bSJan Kara struct ext4_xattr_entry *small_entry; 2511dfa2064bSJan Kara struct ext4_xattr_entry *entry; 2512dfa2064bSJan Kara struct ext4_xattr_entry *last; 2513dfa2064bSJan Kara unsigned int entry_size; /* EA entry size */ 2514dfa2064bSJan Kara unsigned int total_size; /* EA entry size + value size */ 2515dfa2064bSJan Kara unsigned int min_total_size; 2516dfa2064bSJan Kara int error; 2517dfa2064bSJan Kara 2518dfa2064bSJan Kara while (isize_diff > ifree) { 2519dfa2064bSJan Kara entry = NULL; 2520dfa2064bSJan Kara small_entry = NULL; 2521dfa2064bSJan Kara min_total_size = ~0U; 2522dfa2064bSJan Kara last = IFIRST(header); 2523dfa2064bSJan Kara /* Find the entry best suited to be pushed into EA block */ 2524dfa2064bSJan Kara for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 25259bb21cedSTahsin Erdogan total_size = EXT4_XATTR_LEN(last->e_name_len); 25269bb21cedSTahsin Erdogan if (!last->e_value_inum) 25279bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 25289bb21cedSTahsin Erdogan le32_to_cpu(last->e_value_size)); 2529dfa2064bSJan Kara if (total_size <= bfree && 2530dfa2064bSJan Kara total_size < min_total_size) { 2531dfa2064bSJan Kara if (total_size + ifree < isize_diff) { 2532dfa2064bSJan Kara small_entry = last; 2533dfa2064bSJan Kara } else { 2534dfa2064bSJan Kara entry = last; 2535dfa2064bSJan Kara min_total_size = total_size; 2536dfa2064bSJan Kara } 2537dfa2064bSJan Kara } 2538dfa2064bSJan Kara } 2539dfa2064bSJan Kara 2540dfa2064bSJan Kara if (entry == NULL) { 2541dfa2064bSJan Kara if (small_entry == NULL) 2542dfa2064bSJan Kara return -ENOSPC; 2543dfa2064bSJan Kara entry = small_entry; 2544dfa2064bSJan Kara } 2545dfa2064bSJan Kara 2546dfa2064bSJan Kara entry_size = EXT4_XATTR_LEN(entry->e_name_len); 25479bb21cedSTahsin Erdogan total_size = entry_size; 25489bb21cedSTahsin Erdogan if (!entry->e_value_inum) 25499bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 25509bb21cedSTahsin Erdogan le32_to_cpu(entry->e_value_size)); 2551dfa2064bSJan Kara error = ext4_xattr_move_to_block(handle, inode, raw_inode, 2552dfa2064bSJan Kara entry); 2553dfa2064bSJan Kara if (error) 2554dfa2064bSJan Kara return error; 2555dfa2064bSJan Kara 2556dfa2064bSJan Kara *total_ino -= entry_size; 2557dfa2064bSJan Kara ifree += total_size; 2558dfa2064bSJan Kara bfree -= total_size; 2559dfa2064bSJan Kara } 2560dfa2064bSJan Kara 2561dfa2064bSJan Kara return 0; 2562dfa2064bSJan Kara } 2563dfa2064bSJan Kara 25643f2571c1SJan Kara /* 25656dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 25666dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 25676dd4ee7cSKalpak Shah */ 25686dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 25696dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 25706dd4ee7cSKalpak Shah { 25716dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 25726dd4ee7cSKalpak Shah struct buffer_head *bh = NULL; 2573e3014d14SJan Kara size_t min_offs; 2574e3014d14SJan Kara size_t ifree, bfree; 25757b1b2c1bSTheodore Ts'o int total_ino; 25766e0cd088SJan Kara void *base, *end; 2577d0141191SJan Kara int error = 0, tried_min_extra_isize = 0; 2578ac39849dSAneesh Kumar K.V int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); 2579d0141191SJan Kara int isize_diff; /* How much do we need to grow i_extra_isize */ 2580c755e251STheodore Ts'o int no_expand; 25816dd4ee7cSKalpak Shah 2582c755e251STheodore Ts'o if (ext4_write_trylock_xattr(inode, &no_expand) == 0) 2583c755e251STheodore Ts'o return 0; 2584c755e251STheodore Ts'o 25856dd4ee7cSKalpak Shah retry: 2586d0141191SJan Kara isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; 25872e81a4eeSJan Kara if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) 25882e81a4eeSJan Kara goto out; 25896dd4ee7cSKalpak Shah 25906dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 25916dd4ee7cSKalpak Shah 25926dd4ee7cSKalpak Shah /* 25936dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 25946dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 25956dd4ee7cSKalpak Shah */ 25966dd4ee7cSKalpak Shah 25976e0cd088SJan Kara base = IFIRST(header); 25986dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 25996dd4ee7cSKalpak Shah min_offs = end - base; 26006dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 26016dd4ee7cSKalpak Shah 26029e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 26039e92f48cSTheodore Ts'o if (error) 26049e92f48cSTheodore Ts'o goto cleanup; 26059e92f48cSTheodore Ts'o 26066e0cd088SJan Kara ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); 2607e3014d14SJan Kara if (ifree >= isize_diff) 2608e3014d14SJan Kara goto shift; 26096dd4ee7cSKalpak Shah 26106dd4ee7cSKalpak Shah /* 26116dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 26126dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 26136dd4ee7cSKalpak Shah */ 26146dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 26156dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 26166dd4ee7cSKalpak Shah error = -EIO; 26176dd4ee7cSKalpak Shah if (!bh) 26186dd4ee7cSKalpak Shah goto cleanup; 2619cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 262024676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 262124676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 26226a797d27SDarrick J. Wong error = -EFSCORRUPTED; 26236dd4ee7cSKalpak Shah goto cleanup; 26246dd4ee7cSKalpak Shah } 26256dd4ee7cSKalpak Shah base = BHDR(bh); 26266dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 26276dd4ee7cSKalpak Shah min_offs = end - base; 26286e0cd088SJan Kara bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, 26296e0cd088SJan Kara NULL); 2630e3014d14SJan Kara if (bfree + ifree < isize_diff) { 26316dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 26326dd4ee7cSKalpak Shah tried_min_extra_isize++; 26336dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 26346dd4ee7cSKalpak Shah brelse(bh); 26356dd4ee7cSKalpak Shah goto retry; 26366dd4ee7cSKalpak Shah } 2637dfa2064bSJan Kara error = -ENOSPC; 26386dd4ee7cSKalpak Shah goto cleanup; 26396dd4ee7cSKalpak Shah } 26406dd4ee7cSKalpak Shah } else { 2641e3014d14SJan Kara bfree = inode->i_sb->s_blocksize; 26426dd4ee7cSKalpak Shah } 26436dd4ee7cSKalpak Shah 2644dfa2064bSJan Kara error = ext4_xattr_make_inode_space(handle, inode, raw_inode, 2645dfa2064bSJan Kara isize_diff, ifree, bfree, 2646dfa2064bSJan Kara &total_ino); 2647dfa2064bSJan Kara if (error) { 2648dfa2064bSJan Kara if (error == -ENOSPC && !tried_min_extra_isize && 26496dd4ee7cSKalpak Shah s_min_extra_isize) { 26506dd4ee7cSKalpak Shah tried_min_extra_isize++; 26516dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 2652dcb9917bSTheodore Ts'o brelse(bh); 26536dd4ee7cSKalpak Shah goto retry; 26546dd4ee7cSKalpak Shah } 26556dd4ee7cSKalpak Shah goto cleanup; 26566dd4ee7cSKalpak Shah } 2657e3014d14SJan Kara shift: 2658e3014d14SJan Kara /* Adjust the offsets and shift the remaining entries ahead */ 26596e0cd088SJan Kara ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize 2660e3014d14SJan Kara - new_extra_isize, (void *)raw_inode + 2661e3014d14SJan Kara EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 266294405713SJan Kara (void *)header, total_ino); 2663e3014d14SJan Kara EXT4_I(inode)->i_extra_isize = new_extra_isize; 26646dd4ee7cSKalpak Shah brelse(bh); 26652e81a4eeSJan Kara out: 2666c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 26676dd4ee7cSKalpak Shah return 0; 26686dd4ee7cSKalpak Shah 26696dd4ee7cSKalpak Shah cleanup: 26706dd4ee7cSKalpak Shah brelse(bh); 26712e81a4eeSJan Kara /* 2672c755e251STheodore Ts'o * Inode size expansion failed; don't try again 26732e81a4eeSJan Kara */ 2674c755e251STheodore Ts'o no_expand = 1; 2675c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 26766dd4ee7cSKalpak Shah return error; 26776dd4ee7cSKalpak Shah } 26786dd4ee7cSKalpak Shah 2679e50e5129SAndreas Dilger #define EIA_INCR 16 /* must be 2^n */ 2680e50e5129SAndreas Dilger #define EIA_MASK (EIA_INCR - 1) 2681dec214d0STahsin Erdogan 2682dec214d0STahsin Erdogan /* Add the large xattr @inode into @ea_inode_array for deferred iput(). 26830421a189STahsin Erdogan * If @ea_inode_array is new or full it will be grown and the old 2684e50e5129SAndreas Dilger * contents copied over. 2685e50e5129SAndreas Dilger */ 2686e50e5129SAndreas Dilger static int 26870421a189STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 26880421a189STahsin Erdogan struct inode *inode) 2689e50e5129SAndreas Dilger { 26900421a189STahsin Erdogan if (*ea_inode_array == NULL) { 2691e50e5129SAndreas Dilger /* 2692e50e5129SAndreas Dilger * Start with 15 inodes, so it fits into a power-of-two size. 26930421a189STahsin Erdogan * If *ea_inode_array is NULL, this is essentially offsetof() 2694e50e5129SAndreas Dilger */ 26950421a189STahsin Erdogan (*ea_inode_array) = 26960421a189STahsin Erdogan kmalloc(offsetof(struct ext4_xattr_inode_array, 26970421a189STahsin Erdogan inodes[EIA_MASK]), 2698e50e5129SAndreas Dilger GFP_NOFS); 26990421a189STahsin Erdogan if (*ea_inode_array == NULL) 2700e50e5129SAndreas Dilger return -ENOMEM; 27010421a189STahsin Erdogan (*ea_inode_array)->count = 0; 27020421a189STahsin Erdogan } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { 2703e50e5129SAndreas Dilger /* expand the array once all 15 + n * 16 slots are full */ 27040421a189STahsin Erdogan struct ext4_xattr_inode_array *new_array = NULL; 27050421a189STahsin Erdogan int count = (*ea_inode_array)->count; 2706e50e5129SAndreas Dilger 2707e50e5129SAndreas Dilger /* if new_array is NULL, this is essentially offsetof() */ 2708e50e5129SAndreas Dilger new_array = kmalloc( 27090421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, 27100421a189STahsin Erdogan inodes[count + EIA_INCR]), 2711e50e5129SAndreas Dilger GFP_NOFS); 2712e50e5129SAndreas Dilger if (new_array == NULL) 2713e50e5129SAndreas Dilger return -ENOMEM; 27140421a189STahsin Erdogan memcpy(new_array, *ea_inode_array, 27150421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, inodes[count])); 27160421a189STahsin Erdogan kfree(*ea_inode_array); 27170421a189STahsin Erdogan *ea_inode_array = new_array; 2718e50e5129SAndreas Dilger } 27190421a189STahsin Erdogan (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; 2720e50e5129SAndreas Dilger return 0; 2721e50e5129SAndreas Dilger } 2722e50e5129SAndreas Dilger 27236dd4ee7cSKalpak Shah /* 2724617ba13bSMingming Cao * ext4_xattr_delete_inode() 2725ac27a0ecSDave Kleikamp * 2726e50e5129SAndreas Dilger * Free extended attribute resources associated with this inode. Traverse 2727dec214d0STahsin Erdogan * all entries and decrement reference on any xattr inodes associated with this 2728dec214d0STahsin Erdogan * inode. This is called immediately before an inode is freed. We have exclusive 2729dec214d0STahsin Erdogan * access to the inode. If an orphan inode is deleted it will also release its 2730dec214d0STahsin Erdogan * references on xattr block and xattr inodes. 2731ac27a0ecSDave Kleikamp */ 2732dec214d0STahsin Erdogan int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, 273330a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 273430a7eb97STahsin Erdogan int extra_credits) 2735ac27a0ecSDave Kleikamp { 2736ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 2737e50e5129SAndreas Dilger struct ext4_xattr_ibody_header *header; 273830a7eb97STahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 2739dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 274030a7eb97STahsin Erdogan int error; 274130a7eb97STahsin Erdogan 274230a7eb97STahsin Erdogan error = ext4_xattr_ensure_credits(handle, inode, extra_credits, 274330a7eb97STahsin Erdogan NULL /* bh */, 274430a7eb97STahsin Erdogan false /* dirty */, 274530a7eb97STahsin Erdogan false /* block_csum */); 274630a7eb97STahsin Erdogan if (error) { 274730a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); 274830a7eb97STahsin Erdogan goto cleanup; 274930a7eb97STahsin Erdogan } 2750ac27a0ecSDave Kleikamp 2751dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2752dec214d0STahsin Erdogan ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 2753e50e5129SAndreas Dilger 2754e50e5129SAndreas Dilger error = ext4_get_inode_loc(inode, &iloc); 2755dec214d0STahsin Erdogan if (error) { 2756dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); 2757e50e5129SAndreas Dilger goto cleanup; 2758e50e5129SAndreas Dilger } 2759dec214d0STahsin Erdogan 2760dec214d0STahsin Erdogan error = ext4_journal_get_write_access(handle, iloc.bh); 2761dec214d0STahsin Erdogan if (error) { 2762dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "write access (error %d)", 2763dec214d0STahsin Erdogan error); 2764dec214d0STahsin Erdogan goto cleanup; 2765dec214d0STahsin Erdogan } 2766dec214d0STahsin Erdogan 2767dec214d0STahsin Erdogan header = IHDR(inode, ext4_raw_inode(&iloc)); 2768dec214d0STahsin Erdogan if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) 2769dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, 2770dec214d0STahsin Erdogan IFIRST(header), 2771dec214d0STahsin Erdogan false /* block_csum */, 2772dec214d0STahsin Erdogan ea_inode_array, 2773dec214d0STahsin Erdogan extra_credits, 2774dec214d0STahsin Erdogan false /* skip_quota */); 2775dec214d0STahsin Erdogan } 2776dec214d0STahsin Erdogan 2777dec214d0STahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 2778617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 2779ac27a0ecSDave Kleikamp if (!bh) { 278024676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 278124676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 278265d30005STahsin Erdogan error = -EIO; 2783ac27a0ecSDave Kleikamp goto cleanup; 2784ac27a0ecSDave Kleikamp } 2785dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2786dec214d0STahsin Erdogan if (error) { 2787dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "bad block %llu (error %d)", 2788dec214d0STahsin Erdogan EXT4_I(inode)->i_file_acl, error); 2789ac27a0ecSDave Kleikamp goto cleanup; 2790ac27a0ecSDave Kleikamp } 2791e50e5129SAndreas Dilger 279230a7eb97STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) { 2793dec214d0STahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 2794dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 2795dec214d0STahsin Erdogan if (entry->e_value_inum) 2796dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 2797dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 2798dec214d0STahsin Erdogan 2799e50e5129SAndreas Dilger } 2800e50e5129SAndreas Dilger 2801dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bh, ea_inode_array, 2802dec214d0STahsin Erdogan extra_credits); 2803dec214d0STahsin Erdogan /* 2804dec214d0STahsin Erdogan * Update i_file_acl value in the same transaction that releases 2805dec214d0STahsin Erdogan * block. 2806dec214d0STahsin Erdogan */ 2807617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 280830a7eb97STahsin Erdogan error = ext4_mark_inode_dirty(handle, inode); 280930a7eb97STahsin Erdogan if (error) { 281030a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", 281130a7eb97STahsin Erdogan error); 281230a7eb97STahsin Erdogan goto cleanup; 281330a7eb97STahsin Erdogan } 2814dec214d0STahsin Erdogan } 2815dec214d0STahsin Erdogan error = 0; 2816ac27a0ecSDave Kleikamp cleanup: 281730a7eb97STahsin Erdogan brelse(iloc.bh); 2818ac27a0ecSDave Kleikamp brelse(bh); 2819e50e5129SAndreas Dilger return error; 2820e50e5129SAndreas Dilger } 2821e50e5129SAndreas Dilger 28220421a189STahsin Erdogan void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) 2823e50e5129SAndreas Dilger { 2824dec214d0STahsin Erdogan int idx; 2825e50e5129SAndreas Dilger 28260421a189STahsin Erdogan if (ea_inode_array == NULL) 2827e50e5129SAndreas Dilger return; 2828e50e5129SAndreas Dilger 2829dec214d0STahsin Erdogan for (idx = 0; idx < ea_inode_array->count; ++idx) 2830dec214d0STahsin Erdogan iput(ea_inode_array->inodes[idx]); 28310421a189STahsin Erdogan kfree(ea_inode_array); 2832ac27a0ecSDave Kleikamp } 2833ac27a0ecSDave Kleikamp 2834ac27a0ecSDave Kleikamp /* 283547387409STahsin Erdogan * ext4_xattr_block_cache_insert() 2836ac27a0ecSDave Kleikamp * 283747387409STahsin Erdogan * Create a new entry in the extended attribute block cache, and insert 2838ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 2839ac27a0ecSDave Kleikamp * 2840ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2841ac27a0ecSDave Kleikamp */ 2842ac27a0ecSDave Kleikamp static void 284347387409STahsin Erdogan ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, 284447387409STahsin Erdogan struct buffer_head *bh) 2845ac27a0ecSDave Kleikamp { 28466048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 28476048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 28486048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 28496048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 2850ac27a0ecSDave Kleikamp int error; 2851ac27a0ecSDave Kleikamp 285247387409STahsin Erdogan error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, 28536048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 2854ac27a0ecSDave Kleikamp if (error) { 285582939d79SJan Kara if (error == -EBUSY) 2856ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 285782939d79SJan Kara } else 2858ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 2859ac27a0ecSDave Kleikamp } 2860ac27a0ecSDave Kleikamp 2861ac27a0ecSDave Kleikamp /* 2862617ba13bSMingming Cao * ext4_xattr_cmp() 2863ac27a0ecSDave Kleikamp * 2864ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 2865ac27a0ecSDave Kleikamp * 2866ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 2867ac27a0ecSDave Kleikamp * a negative error number on errors. 2868ac27a0ecSDave Kleikamp */ 2869ac27a0ecSDave Kleikamp static int 2870617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 2871617ba13bSMingming Cao struct ext4_xattr_header *header2) 2872ac27a0ecSDave Kleikamp { 2873617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 2874ac27a0ecSDave Kleikamp 2875ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 2876ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 2877ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 2878ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 2879ac27a0ecSDave Kleikamp return 1; 2880ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 2881ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 2882ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 2883ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 2884e50e5129SAndreas Dilger entry1->e_value_inum != entry2->e_value_inum || 2885ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 2886ac27a0ecSDave Kleikamp return 1; 28877cec1918STahsin Erdogan if (!entry1->e_value_inum && 28887cec1918STahsin Erdogan memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 2889ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 2890ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 2891ac27a0ecSDave Kleikamp return 1; 2892ac27a0ecSDave Kleikamp 2893617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 2894617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 2895ac27a0ecSDave Kleikamp } 2896ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 2897ac27a0ecSDave Kleikamp return 1; 2898ac27a0ecSDave Kleikamp return 0; 2899ac27a0ecSDave Kleikamp } 2900ac27a0ecSDave Kleikamp 2901ac27a0ecSDave Kleikamp /* 290247387409STahsin Erdogan * ext4_xattr_block_cache_find() 2903ac27a0ecSDave Kleikamp * 2904ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 2905ac27a0ecSDave Kleikamp * 2906ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 2907ac27a0ecSDave Kleikamp * not found or an error occurred. 2908ac27a0ecSDave Kleikamp */ 2909ac27a0ecSDave Kleikamp static struct buffer_head * 291047387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *inode, 291147387409STahsin Erdogan struct ext4_xattr_header *header, 29127a2508e1SJan Kara struct mb_cache_entry **pce) 2913ac27a0ecSDave Kleikamp { 2914ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 29157a2508e1SJan Kara struct mb_cache_entry *ce; 291647387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 2917ac27a0ecSDave Kleikamp 2918ac27a0ecSDave Kleikamp if (!header->h_hash) 2919ac27a0ecSDave Kleikamp return NULL; /* never share */ 2920ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 292147387409STahsin Erdogan ce = mb_cache_entry_find_first(ea_block_cache, hash); 2922ac27a0ecSDave Kleikamp while (ce) { 2923ac27a0ecSDave Kleikamp struct buffer_head *bh; 2924ac27a0ecSDave Kleikamp 2925c07dfcb4STahsin Erdogan bh = sb_bread(inode->i_sb, ce->e_value); 2926ac27a0ecSDave Kleikamp if (!bh) { 292724676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 2928c07dfcb4STahsin Erdogan (unsigned long)ce->e_value); 2929617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 2930ac27a0ecSDave Kleikamp *pce = ce; 2931ac27a0ecSDave Kleikamp return bh; 2932ac27a0ecSDave Kleikamp } 2933ac27a0ecSDave Kleikamp brelse(bh); 293447387409STahsin Erdogan ce = mb_cache_entry_find_next(ea_block_cache, ce); 2935ac27a0ecSDave Kleikamp } 2936ac27a0ecSDave Kleikamp return NULL; 2937ac27a0ecSDave Kleikamp } 2938ac27a0ecSDave Kleikamp 2939ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 2940ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 2941ac27a0ecSDave Kleikamp 2942ac27a0ecSDave Kleikamp /* 2943617ba13bSMingming Cao * ext4_xattr_hash_entry() 2944ac27a0ecSDave Kleikamp * 2945ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 2946ac27a0ecSDave Kleikamp */ 2947*daf83281STahsin Erdogan static void ext4_xattr_hash_entry(struct ext4_xattr_entry *entry, 2948*daf83281STahsin Erdogan void *value_base) 2949ac27a0ecSDave Kleikamp { 2950ac27a0ecSDave Kleikamp __u32 hash = 0; 2951ac27a0ecSDave Kleikamp char *name = entry->e_name; 2952ac27a0ecSDave Kleikamp int n; 2953ac27a0ecSDave Kleikamp 2954ac27a0ecSDave Kleikamp for (n = 0; n < entry->e_name_len; n++) { 2955ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 2956ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 2957ac27a0ecSDave Kleikamp *name++; 2958ac27a0ecSDave Kleikamp } 2959ac27a0ecSDave Kleikamp 2960e50e5129SAndreas Dilger if (!entry->e_value_inum && entry->e_value_size) { 2961*daf83281STahsin Erdogan __le32 *value = (__le32 *)((char *)value_base + 2962ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs)); 2963ac27a0ecSDave Kleikamp for (n = (le32_to_cpu(entry->e_value_size) + 2964617ba13bSMingming Cao EXT4_XATTR_ROUND) >> EXT4_XATTR_PAD_BITS; n; n--) { 2965ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 2966ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 2967ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 2968ac27a0ecSDave Kleikamp } 2969ac27a0ecSDave Kleikamp } 2970ac27a0ecSDave Kleikamp entry->e_hash = cpu_to_le32(hash); 2971ac27a0ecSDave Kleikamp } 2972ac27a0ecSDave Kleikamp 2973ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 2974ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 2975ac27a0ecSDave Kleikamp 2976ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 2977ac27a0ecSDave Kleikamp 2978ac27a0ecSDave Kleikamp /* 2979617ba13bSMingming Cao * ext4_xattr_rehash() 2980ac27a0ecSDave Kleikamp * 2981ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 2982ac27a0ecSDave Kleikamp */ 2983*daf83281STahsin Erdogan static void ext4_xattr_rehash(struct ext4_xattr_header *header) 2984ac27a0ecSDave Kleikamp { 2985617ba13bSMingming Cao struct ext4_xattr_entry *here; 2986ac27a0ecSDave Kleikamp __u32 hash = 0; 2987ac27a0ecSDave Kleikamp 2988ac27a0ecSDave Kleikamp here = ENTRY(header+1); 2989ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 2990ac27a0ecSDave Kleikamp if (!here->e_hash) { 2991ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 2992ac27a0ecSDave Kleikamp hash = 0; 2993ac27a0ecSDave Kleikamp break; 2994ac27a0ecSDave Kleikamp } 2995ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 2996ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 2997ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 2998617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 2999ac27a0ecSDave Kleikamp } 3000ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 3001ac27a0ecSDave Kleikamp } 3002ac27a0ecSDave Kleikamp 3003ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 3004ac27a0ecSDave Kleikamp 30059c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 30069c191f70ST Makphaibulchoke 30077a2508e1SJan Kara struct mb_cache * 300882939d79SJan Kara ext4_xattr_create_cache(void) 3009ac27a0ecSDave Kleikamp { 30107a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 3011ac27a0ecSDave Kleikamp } 3012ac27a0ecSDave Kleikamp 30137a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 3014ac27a0ecSDave Kleikamp { 30159c191f70ST Makphaibulchoke if (cache) 30167a2508e1SJan Kara mb_cache_destroy(cache); 3017ac27a0ecSDave Kleikamp } 30189c191f70ST Makphaibulchoke 3019