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 **); 80b9fc761eSTahsin Erdogan static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, 81b9fc761eSTahsin Erdogan size_t value_count); 82daf83281STahsin 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 383b9fc761eSTahsin Erdogan ext4_xattr_inode_verify_hashes(struct inode *ea_inode, 384b9fc761eSTahsin Erdogan struct ext4_xattr_entry *entry, void *buffer, 385b9fc761eSTahsin Erdogan size_t size) 386dec214d0STahsin Erdogan { 387dec214d0STahsin Erdogan u32 hash; 388dec214d0STahsin Erdogan 389dec214d0STahsin Erdogan /* Verify stored hash matches calculated hash. */ 390dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); 391dec214d0STahsin Erdogan if (hash != ext4_xattr_inode_get_hash(ea_inode)) 392dec214d0STahsin Erdogan return -EFSCORRUPTED; 393b9fc761eSTahsin Erdogan 394b9fc761eSTahsin Erdogan if (entry) { 395b9fc761eSTahsin Erdogan __le32 e_hash, tmp_data; 396b9fc761eSTahsin Erdogan 397b9fc761eSTahsin Erdogan /* Verify entry hash. */ 398b9fc761eSTahsin Erdogan tmp_data = cpu_to_le32(hash); 399b9fc761eSTahsin Erdogan e_hash = ext4_xattr_hash_entry(entry->e_name, entry->e_name_len, 400b9fc761eSTahsin Erdogan &tmp_data, 1); 401b9fc761eSTahsin Erdogan if (e_hash != entry->e_hash) 402b9fc761eSTahsin Erdogan return -EFSCORRUPTED; 403b9fc761eSTahsin Erdogan } 404dec214d0STahsin Erdogan return 0; 405dec214d0STahsin Erdogan } 406dec214d0STahsin Erdogan 407dec214d0STahsin Erdogan #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec) 408dec214d0STahsin Erdogan 409e50e5129SAndreas Dilger /* 410b9fc761eSTahsin Erdogan * Read xattr value from the EA inode. 411e50e5129SAndreas Dilger */ 412e50e5129SAndreas Dilger static int 413b9fc761eSTahsin Erdogan ext4_xattr_inode_get(struct inode *inode, struct ext4_xattr_entry *entry, 414b9fc761eSTahsin Erdogan void *buffer, size_t size) 415e50e5129SAndreas Dilger { 416dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 417bab79b04STahsin Erdogan struct inode *ea_inode; 418dec214d0STahsin Erdogan int err; 419e50e5129SAndreas Dilger 420b9fc761eSTahsin Erdogan err = ext4_xattr_inode_iget(inode, le32_to_cpu(entry->e_value_inum), 421b9fc761eSTahsin Erdogan &ea_inode); 422dec214d0STahsin Erdogan if (err) { 423dec214d0STahsin Erdogan ea_inode = NULL; 424dec214d0STahsin Erdogan goto out; 425dec214d0STahsin Erdogan } 426e50e5129SAndreas Dilger 427dec214d0STahsin Erdogan if (i_size_read(ea_inode) != size) { 428dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 429dec214d0STahsin Erdogan "ea_inode file size=%llu entry size=%zu", 430dec214d0STahsin Erdogan i_size_read(ea_inode), size); 431dec214d0STahsin Erdogan err = -EFSCORRUPTED; 432dec214d0STahsin Erdogan goto out; 433dec214d0STahsin Erdogan } 434dec214d0STahsin Erdogan 435dec214d0STahsin Erdogan err = ext4_xattr_inode_read(ea_inode, buffer, size); 436dec214d0STahsin Erdogan if (err) 437dec214d0STahsin Erdogan goto out; 438dec214d0STahsin Erdogan 439b9fc761eSTahsin Erdogan err = ext4_xattr_inode_verify_hashes(ea_inode, entry, buffer, size); 440dec214d0STahsin Erdogan /* 441dec214d0STahsin Erdogan * Compatibility check for old Lustre ea_inode implementation. Old 442dec214d0STahsin Erdogan * version does not have hash validation, but it has a backpointer 443dec214d0STahsin Erdogan * from ea_inode to the parent inode. 444dec214d0STahsin Erdogan */ 445dec214d0STahsin Erdogan if (err == -EFSCORRUPTED) { 446dec214d0STahsin Erdogan if (EXT4_XATTR_INODE_GET_PARENT(ea_inode) != inode->i_ino || 447dec214d0STahsin Erdogan ea_inode->i_generation != inode->i_generation) { 448dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 449dec214d0STahsin Erdogan "EA inode hash validation failed"); 450dec214d0STahsin Erdogan goto out; 451dec214d0STahsin Erdogan } 452dec214d0STahsin Erdogan /* Do not add ea_inode to the cache. */ 453dec214d0STahsin Erdogan ea_inode_cache = NULL; 454dec214d0STahsin Erdogan } else if (err) 455dec214d0STahsin Erdogan goto out; 456dec214d0STahsin Erdogan 457dec214d0STahsin Erdogan if (ea_inode_cache) 458dec214d0STahsin Erdogan mb_cache_entry_create(ea_inode_cache, GFP_NOFS, 459dec214d0STahsin Erdogan ext4_xattr_inode_get_hash(ea_inode), 460dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 461dec214d0STahsin Erdogan out: 462e50e5129SAndreas Dilger iput(ea_inode); 463dec214d0STahsin Erdogan return err; 464e50e5129SAndreas Dilger } 465e50e5129SAndreas Dilger 466ac27a0ecSDave Kleikamp static int 467617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 468ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 469ac27a0ecSDave Kleikamp { 470ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 471617ba13bSMingming Cao struct ext4_xattr_entry *entry; 472ac27a0ecSDave Kleikamp size_t size; 473ac27a0ecSDave Kleikamp int error; 47447387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 475ac27a0ecSDave Kleikamp 476ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 477ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 478ac27a0ecSDave Kleikamp 479ac27a0ecSDave Kleikamp error = -ENODATA; 480617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 481ac27a0ecSDave Kleikamp goto cleanup; 482ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 483ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 484617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 485ac27a0ecSDave Kleikamp if (!bh) 486ac27a0ecSDave Kleikamp goto cleanup; 487ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 488ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 489cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 49024676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 491617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 4926a797d27SDarrick J. Wong error = -EFSCORRUPTED; 493ac27a0ecSDave Kleikamp goto cleanup; 494ac27a0ecSDave Kleikamp } 49547387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bh); 496ac27a0ecSDave Kleikamp entry = BFIRST(bh); 4976ba644b9SEric Biggers error = ext4_xattr_find_entry(&entry, name_index, name, 1); 498ac27a0ecSDave Kleikamp if (error) 499ac27a0ecSDave Kleikamp goto cleanup; 500ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 501ac27a0ecSDave Kleikamp if (buffer) { 502ac27a0ecSDave Kleikamp error = -ERANGE; 503ac27a0ecSDave Kleikamp if (size > buffer_size) 504ac27a0ecSDave Kleikamp goto cleanup; 505e50e5129SAndreas Dilger if (entry->e_value_inum) { 506b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 507b9fc761eSTahsin Erdogan size); 508e50e5129SAndreas Dilger if (error) 509e50e5129SAndreas Dilger goto cleanup; 510e50e5129SAndreas Dilger } else { 511e50e5129SAndreas Dilger memcpy(buffer, bh->b_data + 512e50e5129SAndreas Dilger le16_to_cpu(entry->e_value_offs), size); 513e50e5129SAndreas Dilger } 514ac27a0ecSDave Kleikamp } 515ac27a0ecSDave Kleikamp error = size; 516ac27a0ecSDave Kleikamp 517ac27a0ecSDave Kleikamp cleanup: 518ac27a0ecSDave Kleikamp brelse(bh); 519ac27a0ecSDave Kleikamp return error; 520ac27a0ecSDave Kleikamp } 521ac27a0ecSDave Kleikamp 522879b3825STao Ma int 523617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 524ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 525ac27a0ecSDave Kleikamp { 526617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 527617ba13bSMingming Cao struct ext4_xattr_entry *entry; 528617ba13bSMingming Cao struct ext4_inode *raw_inode; 529617ba13bSMingming Cao struct ext4_iloc iloc; 530ac27a0ecSDave Kleikamp size_t size; 531ac27a0ecSDave Kleikamp void *end; 532ac27a0ecSDave Kleikamp int error; 533ac27a0ecSDave Kleikamp 53419f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 535ac27a0ecSDave Kleikamp return -ENODATA; 536617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 537ac27a0ecSDave Kleikamp if (error) 538ac27a0ecSDave Kleikamp return error; 539617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 540ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 541617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 5429e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 543ac27a0ecSDave Kleikamp if (error) 544ac27a0ecSDave Kleikamp goto cleanup; 5456ba644b9SEric Biggers entry = IFIRST(header); 5466ba644b9SEric Biggers error = ext4_xattr_find_entry(&entry, name_index, name, 0); 547ac27a0ecSDave Kleikamp if (error) 548ac27a0ecSDave Kleikamp goto cleanup; 549ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 550ac27a0ecSDave Kleikamp if (buffer) { 551ac27a0ecSDave Kleikamp error = -ERANGE; 552ac27a0ecSDave Kleikamp if (size > buffer_size) 553ac27a0ecSDave Kleikamp goto cleanup; 554e50e5129SAndreas Dilger if (entry->e_value_inum) { 555b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 556b9fc761eSTahsin Erdogan size); 557e50e5129SAndreas Dilger if (error) 558e50e5129SAndreas Dilger goto cleanup; 559e50e5129SAndreas Dilger } else { 560ac27a0ecSDave Kleikamp memcpy(buffer, (void *)IFIRST(header) + 561ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs), size); 562ac27a0ecSDave Kleikamp } 563e50e5129SAndreas Dilger } 564ac27a0ecSDave Kleikamp error = size; 565ac27a0ecSDave Kleikamp 566ac27a0ecSDave Kleikamp cleanup: 567ac27a0ecSDave Kleikamp brelse(iloc.bh); 568ac27a0ecSDave Kleikamp return error; 569ac27a0ecSDave Kleikamp } 570ac27a0ecSDave Kleikamp 571ac27a0ecSDave Kleikamp /* 572617ba13bSMingming Cao * ext4_xattr_get() 573ac27a0ecSDave Kleikamp * 574ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 575ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 576ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 577ac27a0ecSDave Kleikamp * 578ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 579ac27a0ecSDave Kleikamp * used / required on success. 580ac27a0ecSDave Kleikamp */ 581ac27a0ecSDave Kleikamp int 582617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 583ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 584ac27a0ecSDave Kleikamp { 585ac27a0ecSDave Kleikamp int error; 586ac27a0ecSDave Kleikamp 5870db1ff22STheodore Ts'o if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 5880db1ff22STheodore Ts'o return -EIO; 5890db1ff22STheodore Ts'o 590230b8c1aSZhang Zhen if (strlen(name) > 255) 591230b8c1aSZhang Zhen return -ERANGE; 592230b8c1aSZhang Zhen 593617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 594617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 595ac27a0ecSDave Kleikamp buffer_size); 596ac27a0ecSDave Kleikamp if (error == -ENODATA) 597617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 598ac27a0ecSDave Kleikamp buffer_size); 599617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 600ac27a0ecSDave Kleikamp return error; 601ac27a0ecSDave Kleikamp } 602ac27a0ecSDave Kleikamp 603ac27a0ecSDave Kleikamp static int 604431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 605ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 606ac27a0ecSDave Kleikamp { 607ac27a0ecSDave Kleikamp size_t rest = buffer_size; 608ac27a0ecSDave Kleikamp 609617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 61011e27528SStephen Hemminger const struct xattr_handler *handler = 611617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 612ac27a0ecSDave Kleikamp 613764a5c6bSAndreas Gruenbacher if (handler && (!handler->list || handler->list(dentry))) { 614764a5c6bSAndreas Gruenbacher const char *prefix = handler->prefix ?: handler->name; 615764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 616764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 617764a5c6bSAndreas Gruenbacher 618ac27a0ecSDave Kleikamp if (buffer) { 619ac27a0ecSDave Kleikamp if (size > rest) 620ac27a0ecSDave Kleikamp return -ERANGE; 621764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 622764a5c6bSAndreas Gruenbacher buffer += prefix_len; 623764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 624764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 625764a5c6bSAndreas Gruenbacher *buffer++ = 0; 626ac27a0ecSDave Kleikamp } 627ac27a0ecSDave Kleikamp rest -= size; 628ac27a0ecSDave Kleikamp } 629ac27a0ecSDave Kleikamp } 630764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 631ac27a0ecSDave Kleikamp } 632ac27a0ecSDave Kleikamp 633ac27a0ecSDave Kleikamp static int 634431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 635ac27a0ecSDave Kleikamp { 6362b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 637ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 638ac27a0ecSDave Kleikamp int error; 639ac27a0ecSDave Kleikamp 640ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 641ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 642ac27a0ecSDave Kleikamp 643ac27a0ecSDave Kleikamp error = 0; 644617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 645ac27a0ecSDave Kleikamp goto cleanup; 646ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 647ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 648617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 649ac27a0ecSDave Kleikamp error = -EIO; 650ac27a0ecSDave Kleikamp if (!bh) 651ac27a0ecSDave Kleikamp goto cleanup; 652ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 653ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 654cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 65524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 656617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 6576a797d27SDarrick J. Wong error = -EFSCORRUPTED; 658ac27a0ecSDave Kleikamp goto cleanup; 659ac27a0ecSDave Kleikamp } 66047387409STahsin Erdogan ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); 661431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); 662ac27a0ecSDave Kleikamp 663ac27a0ecSDave Kleikamp cleanup: 664ac27a0ecSDave Kleikamp brelse(bh); 665ac27a0ecSDave Kleikamp 666ac27a0ecSDave Kleikamp return error; 667ac27a0ecSDave Kleikamp } 668ac27a0ecSDave Kleikamp 669ac27a0ecSDave Kleikamp static int 670431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 671ac27a0ecSDave Kleikamp { 6722b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 673617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 674617ba13bSMingming Cao struct ext4_inode *raw_inode; 675617ba13bSMingming Cao struct ext4_iloc iloc; 676ac27a0ecSDave Kleikamp void *end; 677ac27a0ecSDave Kleikamp int error; 678ac27a0ecSDave Kleikamp 67919f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 680ac27a0ecSDave Kleikamp return 0; 681617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 682ac27a0ecSDave Kleikamp if (error) 683ac27a0ecSDave Kleikamp return error; 684617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 685ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 686617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 6879e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 688ac27a0ecSDave Kleikamp if (error) 689ac27a0ecSDave Kleikamp goto cleanup; 690431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 691ac27a0ecSDave Kleikamp buffer, buffer_size); 692ac27a0ecSDave Kleikamp 693ac27a0ecSDave Kleikamp cleanup: 694ac27a0ecSDave Kleikamp brelse(iloc.bh); 695ac27a0ecSDave Kleikamp return error; 696ac27a0ecSDave Kleikamp } 697ac27a0ecSDave Kleikamp 698ac27a0ecSDave Kleikamp /* 699ba7ea1d8SEric Biggers * Inode operation listxattr() 700ba7ea1d8SEric Biggers * 701ba7ea1d8SEric Biggers * d_inode(dentry)->i_rwsem: don't care 702ac27a0ecSDave Kleikamp * 703ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 704ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 705ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 706ac27a0ecSDave Kleikamp * 707ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 708ac27a0ecSDave Kleikamp * used / required on success. 709ac27a0ecSDave Kleikamp */ 710ba7ea1d8SEric Biggers ssize_t 711ba7ea1d8SEric Biggers ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) 712ac27a0ecSDave Kleikamp { 713eaeef867STheodore Ts'o int ret, ret2; 714ac27a0ecSDave Kleikamp 7152b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 716eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 717eaeef867STheodore Ts'o if (ret < 0) 718eaeef867STheodore Ts'o goto errout; 719ac27a0ecSDave Kleikamp if (buffer) { 720eaeef867STheodore Ts'o buffer += ret; 721eaeef867STheodore Ts'o buffer_size -= ret; 722ac27a0ecSDave Kleikamp } 723eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 724eaeef867STheodore Ts'o if (ret < 0) 725eaeef867STheodore Ts'o goto errout; 726eaeef867STheodore Ts'o ret += ret2; 727eaeef867STheodore Ts'o errout: 7282b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 729eaeef867STheodore Ts'o return ret; 730ac27a0ecSDave Kleikamp } 731ac27a0ecSDave Kleikamp 732ac27a0ecSDave Kleikamp /* 733617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 734ac27a0ecSDave Kleikamp * not set, set it. 735ac27a0ecSDave Kleikamp */ 736617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 737ac27a0ecSDave Kleikamp struct super_block *sb) 738ac27a0ecSDave Kleikamp { 739e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 740ac27a0ecSDave Kleikamp return; 741ac27a0ecSDave Kleikamp 7425d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 743617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 744e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 745a0375156STheodore Ts'o ext4_handle_dirty_super(handle, sb); 746ac27a0ecSDave Kleikamp } 747ac27a0ecSDave Kleikamp } 748ac27a0ecSDave Kleikamp 7497a9ca53aSTahsin Erdogan int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) 7507a9ca53aSTahsin Erdogan { 7517a9ca53aSTahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 7527a9ca53aSTahsin Erdogan struct buffer_head *bh = NULL; 7537a9ca53aSTahsin Erdogan struct ext4_inode *raw_inode; 7547a9ca53aSTahsin Erdogan struct ext4_xattr_ibody_header *header; 7557a9ca53aSTahsin Erdogan struct ext4_xattr_entry *entry; 7567a9ca53aSTahsin Erdogan qsize_t ea_inode_refs = 0; 7577a9ca53aSTahsin Erdogan void *end; 7587a9ca53aSTahsin Erdogan int ret; 7597a9ca53aSTahsin Erdogan 7607a9ca53aSTahsin Erdogan lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); 7617a9ca53aSTahsin Erdogan 7627a9ca53aSTahsin Erdogan if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 7637a9ca53aSTahsin Erdogan ret = ext4_get_inode_loc(inode, &iloc); 7647a9ca53aSTahsin Erdogan if (ret) 7657a9ca53aSTahsin Erdogan goto out; 7667a9ca53aSTahsin Erdogan raw_inode = ext4_raw_inode(&iloc); 7677a9ca53aSTahsin Erdogan header = IHDR(inode, raw_inode); 7687a9ca53aSTahsin Erdogan end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 7697a9ca53aSTahsin Erdogan ret = xattr_check_inode(inode, header, end); 7707a9ca53aSTahsin Erdogan if (ret) 7717a9ca53aSTahsin Erdogan goto out; 7727a9ca53aSTahsin Erdogan 7737a9ca53aSTahsin Erdogan for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); 7747a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 7757a9ca53aSTahsin Erdogan if (entry->e_value_inum) 7767a9ca53aSTahsin Erdogan ea_inode_refs++; 7777a9ca53aSTahsin Erdogan } 7787a9ca53aSTahsin Erdogan 7797a9ca53aSTahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 7807a9ca53aSTahsin Erdogan bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 7817a9ca53aSTahsin Erdogan if (!bh) { 7827a9ca53aSTahsin Erdogan ret = -EIO; 7837a9ca53aSTahsin Erdogan goto out; 7847a9ca53aSTahsin Erdogan } 7857a9ca53aSTahsin Erdogan 7867a9ca53aSTahsin Erdogan if (ext4_xattr_check_block(inode, bh)) { 7877a9ca53aSTahsin Erdogan ret = -EFSCORRUPTED; 7887a9ca53aSTahsin Erdogan goto out; 7897a9ca53aSTahsin Erdogan } 7907a9ca53aSTahsin Erdogan 7917a9ca53aSTahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 7927a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 7937a9ca53aSTahsin Erdogan if (entry->e_value_inum) 7947a9ca53aSTahsin Erdogan ea_inode_refs++; 7957a9ca53aSTahsin Erdogan } 7967a9ca53aSTahsin Erdogan *usage = ea_inode_refs + 1; 7977a9ca53aSTahsin Erdogan ret = 0; 7987a9ca53aSTahsin Erdogan out: 7997a9ca53aSTahsin Erdogan brelse(iloc.bh); 8007a9ca53aSTahsin Erdogan brelse(bh); 8017a9ca53aSTahsin Erdogan return ret; 8027a9ca53aSTahsin Erdogan } 8037a9ca53aSTahsin Erdogan 804dec214d0STahsin Erdogan static inline size_t round_up_cluster(struct inode *inode, size_t length) 805dec214d0STahsin Erdogan { 806dec214d0STahsin Erdogan struct super_block *sb = inode->i_sb; 807dec214d0STahsin Erdogan size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + 808dec214d0STahsin Erdogan inode->i_blkbits); 809dec214d0STahsin Erdogan size_t mask = ~(cluster_size - 1); 810dec214d0STahsin Erdogan 811dec214d0STahsin Erdogan return (length + cluster_size - 1) & mask; 812dec214d0STahsin Erdogan } 813dec214d0STahsin Erdogan 814dec214d0STahsin Erdogan static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) 815dec214d0STahsin Erdogan { 816dec214d0STahsin Erdogan int err; 817dec214d0STahsin Erdogan 818dec214d0STahsin Erdogan err = dquot_alloc_inode(inode); 819dec214d0STahsin Erdogan if (err) 820dec214d0STahsin Erdogan return err; 821dec214d0STahsin Erdogan err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); 822dec214d0STahsin Erdogan if (err) 823dec214d0STahsin Erdogan dquot_free_inode(inode); 824dec214d0STahsin Erdogan return err; 825dec214d0STahsin Erdogan } 826dec214d0STahsin Erdogan 827dec214d0STahsin Erdogan static void ext4_xattr_inode_free_quota(struct inode *inode, size_t len) 828dec214d0STahsin Erdogan { 829dec214d0STahsin Erdogan dquot_free_space_nodirty(inode, round_up_cluster(inode, len)); 830dec214d0STahsin Erdogan dquot_free_inode(inode); 831dec214d0STahsin Erdogan } 832dec214d0STahsin Erdogan 833dec214d0STahsin Erdogan static int __ext4_xattr_set_credits(struct inode *inode, 834dec214d0STahsin Erdogan struct buffer_head *block_bh, 835dec214d0STahsin Erdogan size_t value_len) 836dec214d0STahsin Erdogan { 837dec214d0STahsin Erdogan struct super_block *sb = inode->i_sb; 838dec214d0STahsin Erdogan int credits; 839dec214d0STahsin Erdogan int blocks; 840dec214d0STahsin Erdogan 841dec214d0STahsin Erdogan /* 842dec214d0STahsin Erdogan * 1) Owner inode update 843dec214d0STahsin Erdogan * 2) Ref count update on old xattr block 844dec214d0STahsin Erdogan * 3) new xattr block 845dec214d0STahsin Erdogan * 4) block bitmap update for new xattr block 846dec214d0STahsin Erdogan * 5) group descriptor for new xattr block 847dec214d0STahsin Erdogan * 6) block bitmap update for old xattr block 848dec214d0STahsin Erdogan * 7) group descriptor for old block 849dec214d0STahsin Erdogan * 850dec214d0STahsin Erdogan * 6 & 7 can happen if we have two racing threads T_a and T_b 851dec214d0STahsin Erdogan * which are each trying to set an xattr on inodes I_a and I_b 852dec214d0STahsin Erdogan * which were both initially sharing an xattr block. 853dec214d0STahsin Erdogan */ 854dec214d0STahsin Erdogan credits = 7; 855dec214d0STahsin Erdogan 856dec214d0STahsin Erdogan /* Quota updates. */ 857dec214d0STahsin Erdogan credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); 858dec214d0STahsin Erdogan 859dec214d0STahsin Erdogan /* 860dec214d0STahsin Erdogan * In case of inline data, we may push out the data to a block, 861dec214d0STahsin Erdogan * so we need to reserve credits for this eventuality 862dec214d0STahsin Erdogan */ 863dec214d0STahsin Erdogan if (ext4_has_inline_data(inode)) 864dec214d0STahsin Erdogan credits += ext4_writepage_trans_blocks(inode) + 1; 865dec214d0STahsin Erdogan 866dec214d0STahsin Erdogan /* We are done if ea_inode feature is not enabled. */ 867dec214d0STahsin Erdogan if (!ext4_has_feature_ea_inode(sb)) 868dec214d0STahsin Erdogan return credits; 869dec214d0STahsin Erdogan 870dec214d0STahsin Erdogan /* New ea_inode, inode map, block bitmap, group descriptor. */ 871dec214d0STahsin Erdogan credits += 4; 872dec214d0STahsin Erdogan 873dec214d0STahsin Erdogan /* Data blocks. */ 874dec214d0STahsin Erdogan blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 875dec214d0STahsin Erdogan 876dec214d0STahsin Erdogan /* Indirection block or one level of extent tree. */ 877dec214d0STahsin Erdogan blocks += 1; 878dec214d0STahsin Erdogan 879dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 880dec214d0STahsin Erdogan credits += blocks * 2; 881dec214d0STahsin Erdogan 882dec214d0STahsin Erdogan /* Blocks themselves. */ 883dec214d0STahsin Erdogan credits += blocks; 884dec214d0STahsin Erdogan 885dec214d0STahsin Erdogan /* Dereference ea_inode holding old xattr value. 886dec214d0STahsin Erdogan * Old ea_inode, inode map, block bitmap, group descriptor. 887dec214d0STahsin Erdogan */ 888dec214d0STahsin Erdogan credits += 4; 889dec214d0STahsin Erdogan 890dec214d0STahsin Erdogan /* Data blocks for old ea_inode. */ 891dec214d0STahsin Erdogan blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; 892dec214d0STahsin Erdogan 893dec214d0STahsin Erdogan /* Indirection block or one level of extent tree for old ea_inode. */ 894dec214d0STahsin Erdogan blocks += 1; 895dec214d0STahsin Erdogan 896dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 897dec214d0STahsin Erdogan credits += blocks * 2; 898dec214d0STahsin Erdogan 899dec214d0STahsin Erdogan /* We may need to clone the existing xattr block in which case we need 900dec214d0STahsin Erdogan * to increment ref counts for existing ea_inodes referenced by it. 901dec214d0STahsin Erdogan */ 902dec214d0STahsin Erdogan if (block_bh) { 903dec214d0STahsin Erdogan struct ext4_xattr_entry *entry = BFIRST(block_bh); 904dec214d0STahsin Erdogan 905dec214d0STahsin Erdogan for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) 906dec214d0STahsin Erdogan if (entry->e_value_inum) 907dec214d0STahsin Erdogan /* Ref count update on ea_inode. */ 908dec214d0STahsin Erdogan credits += 1; 909dec214d0STahsin Erdogan } 910dec214d0STahsin Erdogan return credits; 911dec214d0STahsin Erdogan } 912dec214d0STahsin Erdogan 91330a7eb97STahsin Erdogan static int ext4_xattr_ensure_credits(handle_t *handle, struct inode *inode, 91430a7eb97STahsin Erdogan int credits, struct buffer_head *bh, 91530a7eb97STahsin Erdogan bool dirty, bool block_csum) 91630a7eb97STahsin Erdogan { 91730a7eb97STahsin Erdogan int error; 91830a7eb97STahsin Erdogan 91930a7eb97STahsin Erdogan if (!ext4_handle_valid(handle)) 92030a7eb97STahsin Erdogan return 0; 92130a7eb97STahsin Erdogan 92230a7eb97STahsin Erdogan if (handle->h_buffer_credits >= credits) 92330a7eb97STahsin Erdogan return 0; 92430a7eb97STahsin Erdogan 92530a7eb97STahsin Erdogan error = ext4_journal_extend(handle, credits - handle->h_buffer_credits); 92630a7eb97STahsin Erdogan if (!error) 92730a7eb97STahsin Erdogan return 0; 92830a7eb97STahsin Erdogan if (error < 0) { 92930a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Extend journal (error %d)", error); 93030a7eb97STahsin Erdogan return error; 93130a7eb97STahsin Erdogan } 93230a7eb97STahsin Erdogan 93330a7eb97STahsin Erdogan if (bh && dirty) { 93430a7eb97STahsin Erdogan if (block_csum) 93530a7eb97STahsin Erdogan ext4_xattr_block_csum_set(inode, bh); 93630a7eb97STahsin Erdogan error = ext4_handle_dirty_metadata(handle, NULL, bh); 93730a7eb97STahsin Erdogan if (error) { 93830a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Handle metadata (error %d)", 93930a7eb97STahsin Erdogan error); 94030a7eb97STahsin Erdogan return error; 94130a7eb97STahsin Erdogan } 94230a7eb97STahsin Erdogan } 94330a7eb97STahsin Erdogan 94430a7eb97STahsin Erdogan error = ext4_journal_restart(handle, credits); 94530a7eb97STahsin Erdogan if (error) { 94630a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Restart journal (error %d)", error); 94730a7eb97STahsin Erdogan return error; 94830a7eb97STahsin Erdogan } 94930a7eb97STahsin Erdogan 95030a7eb97STahsin Erdogan if (bh) { 95130a7eb97STahsin Erdogan error = ext4_journal_get_write_access(handle, bh); 95230a7eb97STahsin Erdogan if (error) { 95330a7eb97STahsin Erdogan ext4_warning(inode->i_sb, 95430a7eb97STahsin Erdogan "Get write access failed (error %d)", 95530a7eb97STahsin Erdogan error); 95630a7eb97STahsin Erdogan return error; 95730a7eb97STahsin Erdogan } 95830a7eb97STahsin Erdogan } 95930a7eb97STahsin Erdogan return 0; 96030a7eb97STahsin Erdogan } 96130a7eb97STahsin Erdogan 962dec214d0STahsin Erdogan static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, 963dec214d0STahsin Erdogan int ref_change) 964dec214d0STahsin Erdogan { 965dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(ea_inode); 966dec214d0STahsin Erdogan struct ext4_iloc iloc; 967dec214d0STahsin Erdogan s64 ref_count; 968dec214d0STahsin Erdogan u32 hash; 969dec214d0STahsin Erdogan int ret; 970dec214d0STahsin Erdogan 971dec214d0STahsin Erdogan inode_lock(ea_inode); 972dec214d0STahsin Erdogan 973dec214d0STahsin Erdogan ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); 974dec214d0STahsin Erdogan if (ret) { 975dec214d0STahsin Erdogan iloc.bh = NULL; 976dec214d0STahsin Erdogan goto out; 977dec214d0STahsin Erdogan } 978dec214d0STahsin Erdogan 979dec214d0STahsin Erdogan ref_count = ext4_xattr_inode_get_ref(ea_inode); 980dec214d0STahsin Erdogan ref_count += ref_change; 981dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, ref_count); 982dec214d0STahsin Erdogan 983dec214d0STahsin Erdogan if (ref_change > 0) { 984dec214d0STahsin Erdogan WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", 985dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 986dec214d0STahsin Erdogan 987dec214d0STahsin Erdogan if (ref_count == 1) { 988dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", 989dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 990dec214d0STahsin Erdogan 991dec214d0STahsin Erdogan set_nlink(ea_inode, 1); 992dec214d0STahsin Erdogan ext4_orphan_del(handle, ea_inode); 993dec214d0STahsin Erdogan 994*cdb7ee4cSTahsin Erdogan if (ea_inode_cache) { 995dec214d0STahsin Erdogan hash = ext4_xattr_inode_get_hash(ea_inode); 996*cdb7ee4cSTahsin Erdogan mb_cache_entry_create(ea_inode_cache, 997*cdb7ee4cSTahsin Erdogan GFP_NOFS, hash, 998dec214d0STahsin Erdogan ea_inode->i_ino, 999dec214d0STahsin Erdogan true /* reusable */); 1000dec214d0STahsin Erdogan } 1001*cdb7ee4cSTahsin Erdogan } 1002dec214d0STahsin Erdogan } else { 1003dec214d0STahsin Erdogan WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", 1004dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1005dec214d0STahsin Erdogan 1006dec214d0STahsin Erdogan if (ref_count == 0) { 1007dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink != 1, 1008dec214d0STahsin Erdogan "EA inode %lu i_nlink=%u", 1009dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1010dec214d0STahsin Erdogan 1011dec214d0STahsin Erdogan clear_nlink(ea_inode); 1012dec214d0STahsin Erdogan ext4_orphan_add(handle, ea_inode); 1013dec214d0STahsin Erdogan 1014*cdb7ee4cSTahsin Erdogan if (ea_inode_cache) { 1015dec214d0STahsin Erdogan hash = ext4_xattr_inode_get_hash(ea_inode); 1016dec214d0STahsin Erdogan mb_cache_entry_delete(ea_inode_cache, hash, 1017dec214d0STahsin Erdogan ea_inode->i_ino); 1018dec214d0STahsin Erdogan } 1019dec214d0STahsin Erdogan } 1020*cdb7ee4cSTahsin Erdogan } 1021dec214d0STahsin Erdogan 1022dec214d0STahsin Erdogan ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); 1023dec214d0STahsin Erdogan iloc.bh = NULL; 1024dec214d0STahsin Erdogan if (ret) 1025dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 1026dec214d0STahsin Erdogan "ext4_mark_iloc_dirty() failed ret=%d", ret); 1027dec214d0STahsin Erdogan out: 1028dec214d0STahsin Erdogan brelse(iloc.bh); 1029dec214d0STahsin Erdogan inode_unlock(ea_inode); 1030dec214d0STahsin Erdogan return ret; 1031dec214d0STahsin Erdogan } 1032dec214d0STahsin Erdogan 1033dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) 1034dec214d0STahsin Erdogan { 1035dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, 1); 1036dec214d0STahsin Erdogan } 1037dec214d0STahsin Erdogan 1038dec214d0STahsin Erdogan static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) 1039dec214d0STahsin Erdogan { 1040dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, -1); 1041dec214d0STahsin Erdogan } 1042dec214d0STahsin Erdogan 1043dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, 1044dec214d0STahsin Erdogan struct ext4_xattr_entry *first) 1045dec214d0STahsin Erdogan { 1046dec214d0STahsin Erdogan struct inode *ea_inode; 1047dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 1048dec214d0STahsin Erdogan struct ext4_xattr_entry *failed_entry; 1049dec214d0STahsin Erdogan unsigned int ea_ino; 1050dec214d0STahsin Erdogan int err, saved_err; 1051dec214d0STahsin Erdogan 1052dec214d0STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 1053dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1054dec214d0STahsin Erdogan if (!entry->e_value_inum) 1055dec214d0STahsin Erdogan continue; 1056dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1057dec214d0STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, &ea_inode); 1058dec214d0STahsin Erdogan if (err) 1059dec214d0STahsin Erdogan goto cleanup; 1060dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1061dec214d0STahsin Erdogan if (err) { 1062dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "inc ref error %d", err); 1063dec214d0STahsin Erdogan iput(ea_inode); 1064dec214d0STahsin Erdogan goto cleanup; 1065dec214d0STahsin Erdogan } 1066dec214d0STahsin Erdogan iput(ea_inode); 1067dec214d0STahsin Erdogan } 1068dec214d0STahsin Erdogan return 0; 1069dec214d0STahsin Erdogan 1070dec214d0STahsin Erdogan cleanup: 1071dec214d0STahsin Erdogan saved_err = err; 1072dec214d0STahsin Erdogan failed_entry = entry; 1073dec214d0STahsin Erdogan 1074dec214d0STahsin Erdogan for (entry = first; entry != failed_entry; 1075dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1076dec214d0STahsin Erdogan if (!entry->e_value_inum) 1077dec214d0STahsin Erdogan continue; 1078dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1079dec214d0STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, &ea_inode); 1080dec214d0STahsin Erdogan if (err) { 1081dec214d0STahsin Erdogan ext4_warning(parent->i_sb, 1082dec214d0STahsin Erdogan "cleanup ea_ino %u iget error %d", ea_ino, 1083dec214d0STahsin Erdogan err); 1084dec214d0STahsin Erdogan continue; 1085dec214d0STahsin Erdogan } 1086dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1087dec214d0STahsin Erdogan if (err) 1088dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "cleanup dec ref error %d", 1089dec214d0STahsin Erdogan err); 1090dec214d0STahsin Erdogan iput(ea_inode); 1091dec214d0STahsin Erdogan } 1092dec214d0STahsin Erdogan return saved_err; 1093dec214d0STahsin Erdogan } 1094dec214d0STahsin Erdogan 109530a7eb97STahsin Erdogan static void 1096dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, 109730a7eb97STahsin Erdogan struct buffer_head *bh, 109830a7eb97STahsin Erdogan struct ext4_xattr_entry *first, bool block_csum, 109930a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1100dec214d0STahsin Erdogan int extra_credits, bool skip_quota) 110130a7eb97STahsin Erdogan { 110230a7eb97STahsin Erdogan struct inode *ea_inode; 110330a7eb97STahsin Erdogan struct ext4_xattr_entry *entry; 110430a7eb97STahsin Erdogan bool dirty = false; 110530a7eb97STahsin Erdogan unsigned int ea_ino; 110630a7eb97STahsin Erdogan int err; 110730a7eb97STahsin Erdogan int credits; 110830a7eb97STahsin Erdogan 110930a7eb97STahsin Erdogan /* One credit for dec ref on ea_inode, one for orphan list addition, */ 111030a7eb97STahsin Erdogan credits = 2 + extra_credits; 111130a7eb97STahsin Erdogan 111230a7eb97STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 111330a7eb97STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 111430a7eb97STahsin Erdogan if (!entry->e_value_inum) 111530a7eb97STahsin Erdogan continue; 111630a7eb97STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 111730a7eb97STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, &ea_inode); 111830a7eb97STahsin Erdogan if (err) 111930a7eb97STahsin Erdogan continue; 112030a7eb97STahsin Erdogan 112130a7eb97STahsin Erdogan err = ext4_expand_inode_array(ea_inode_array, ea_inode); 112230a7eb97STahsin Erdogan if (err) { 112330a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, 112430a7eb97STahsin Erdogan "Expand inode array err=%d", err); 112530a7eb97STahsin Erdogan iput(ea_inode); 112630a7eb97STahsin Erdogan continue; 112730a7eb97STahsin Erdogan } 112830a7eb97STahsin Erdogan 112930a7eb97STahsin Erdogan err = ext4_xattr_ensure_credits(handle, parent, credits, bh, 113030a7eb97STahsin Erdogan dirty, block_csum); 113130a7eb97STahsin Erdogan if (err) { 113230a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, "Ensure credits err=%d", 113330a7eb97STahsin Erdogan err); 113430a7eb97STahsin Erdogan continue; 113530a7eb97STahsin Erdogan } 113630a7eb97STahsin Erdogan 1137dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1138dec214d0STahsin Erdogan if (err) { 1139dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", 1140dec214d0STahsin Erdogan err); 1141dec214d0STahsin Erdogan continue; 1142dec214d0STahsin Erdogan } 1143dec214d0STahsin Erdogan 1144dec214d0STahsin Erdogan if (!skip_quota) 1145dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(parent, 1146dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 114730a7eb97STahsin Erdogan 114830a7eb97STahsin Erdogan /* 114930a7eb97STahsin Erdogan * Forget about ea_inode within the same transaction that 115030a7eb97STahsin Erdogan * decrements the ref count. This avoids duplicate decrements in 115130a7eb97STahsin Erdogan * case the rest of the work spills over to subsequent 115230a7eb97STahsin Erdogan * transactions. 115330a7eb97STahsin Erdogan */ 115430a7eb97STahsin Erdogan entry->e_value_inum = 0; 115530a7eb97STahsin Erdogan entry->e_value_size = 0; 115630a7eb97STahsin Erdogan 115730a7eb97STahsin Erdogan dirty = true; 115830a7eb97STahsin Erdogan } 115930a7eb97STahsin Erdogan 116030a7eb97STahsin Erdogan if (dirty) { 116130a7eb97STahsin Erdogan /* 116230a7eb97STahsin Erdogan * Note that we are deliberately skipping csum calculation for 116330a7eb97STahsin Erdogan * the final update because we do not expect any journal 116430a7eb97STahsin Erdogan * restarts until xattr block is freed. 116530a7eb97STahsin Erdogan */ 116630a7eb97STahsin Erdogan 116730a7eb97STahsin Erdogan err = ext4_handle_dirty_metadata(handle, NULL, bh); 116830a7eb97STahsin Erdogan if (err) 116930a7eb97STahsin Erdogan ext4_warning_inode(parent, 117030a7eb97STahsin Erdogan "handle dirty metadata err=%d", err); 117130a7eb97STahsin Erdogan } 117230a7eb97STahsin Erdogan } 117330a7eb97STahsin Erdogan 1174ac27a0ecSDave Kleikamp /* 1175ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 1176ec4cb1aaSJan Kara * otherwise free the block. 1177ac27a0ecSDave Kleikamp */ 1178ac27a0ecSDave Kleikamp static void 1179617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 1180dec214d0STahsin Erdogan struct buffer_head *bh, 1181dec214d0STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1182dec214d0STahsin Erdogan int extra_credits) 1183ac27a0ecSDave Kleikamp { 118447387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 11856048c64bSAndreas Gruenbacher u32 hash, ref; 11868a2bfdcbSMingming Cao int error = 0; 1187ac27a0ecSDave Kleikamp 11885d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 11898a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 11908a2bfdcbSMingming Cao if (error) 11918a2bfdcbSMingming Cao goto out; 11928a2bfdcbSMingming Cao 11938a2bfdcbSMingming Cao lock_buffer(bh); 11946048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 11956048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 11966048c64bSAndreas Gruenbacher if (ref == 1) { 1197ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 119882939d79SJan Kara /* 119982939d79SJan Kara * This must happen under buffer lock for 120082939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 120182939d79SJan Kara */ 1202*cdb7ee4cSTahsin Erdogan if (ea_block_cache) 1203*cdb7ee4cSTahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, 1204*cdb7ee4cSTahsin Erdogan bh->b_blocknr); 1205ac27a0ecSDave Kleikamp get_bh(bh); 1206ec4cb1aaSJan Kara unlock_buffer(bh); 1207dec214d0STahsin Erdogan 1208dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) 1209dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, bh, 1210dec214d0STahsin Erdogan BFIRST(bh), 1211dec214d0STahsin Erdogan true /* block_csum */, 1212dec214d0STahsin Erdogan ea_inode_array, 1213dec214d0STahsin Erdogan extra_credits, 1214dec214d0STahsin Erdogan true /* skip_quota */); 1215e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 1216e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 1217e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 1218ac27a0ecSDave Kleikamp } else { 12196048c64bSAndreas Gruenbacher ref--; 12206048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 12216048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 12226048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 12236048c64bSAndreas Gruenbacher 1224*cdb7ee4cSTahsin Erdogan if (ea_block_cache) { 122547387409STahsin Erdogan ce = mb_cache_entry_get(ea_block_cache, hash, 12266048c64bSAndreas Gruenbacher bh->b_blocknr); 12276048c64bSAndreas Gruenbacher if (ce) { 12286048c64bSAndreas Gruenbacher ce->e_reusable = 1; 122947387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 12306048c64bSAndreas Gruenbacher } 12316048c64bSAndreas Gruenbacher } 1232*cdb7ee4cSTahsin Erdogan } 12336048c64bSAndreas Gruenbacher 1234dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bh); 1235ec4cb1aaSJan Kara /* 1236ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 1237ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 1238ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 1239ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 1240ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 1241dac7a4b4STheodore Ts'o * call ext4_handle_dirty_metadata() with locked buffer as 1242ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 1243ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 1244ec4cb1aaSJan Kara */ 1245ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 1246dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1247c1bb05a6SEric Sandeen unlock_buffer(bh); 1248ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 1249dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1250ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 12510390131bSFrank Mayhar ext4_handle_sync(handle); 12521231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 1253ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 1254ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 1255ac27a0ecSDave Kleikamp } 12568a2bfdcbSMingming Cao out: 12578a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 12588a2bfdcbSMingming Cao return; 1259ac27a0ecSDave Kleikamp } 1260ac27a0ecSDave Kleikamp 12616dd4ee7cSKalpak Shah /* 12626dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 12636dd4ee7cSKalpak Shah * bytes used by EA entries. 12646dd4ee7cSKalpak Shah */ 12656dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 12666dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 12676dd4ee7cSKalpak Shah { 12686dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1269e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 12706dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 12716dd4ee7cSKalpak Shah if (offs < *min_offs) 12726dd4ee7cSKalpak Shah *min_offs = offs; 12736dd4ee7cSKalpak Shah } 12747b1b2c1bSTheodore Ts'o if (total) 12757b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 12766dd4ee7cSKalpak Shah } 12776dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 12786dd4ee7cSKalpak Shah } 12796dd4ee7cSKalpak Shah 1280e50e5129SAndreas Dilger /* 1281e50e5129SAndreas Dilger * Write the value of the EA in an inode. 1282e50e5129SAndreas Dilger */ 1283e50e5129SAndreas Dilger static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, 1284e50e5129SAndreas Dilger const void *buf, int bufsize) 1285e50e5129SAndreas Dilger { 1286e50e5129SAndreas Dilger struct buffer_head *bh = NULL; 1287e50e5129SAndreas Dilger unsigned long block = 0; 1288dec214d0STahsin Erdogan int blocksize = ea_inode->i_sb->s_blocksize; 1289dec214d0STahsin Erdogan int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; 1290e50e5129SAndreas Dilger int csize, wsize = 0; 1291e50e5129SAndreas Dilger int ret = 0; 1292e50e5129SAndreas Dilger int retries = 0; 1293e50e5129SAndreas Dilger 1294e50e5129SAndreas Dilger retry: 1295e50e5129SAndreas Dilger while (ret >= 0 && ret < max_blocks) { 1296e50e5129SAndreas Dilger struct ext4_map_blocks map; 1297e50e5129SAndreas Dilger map.m_lblk = block += ret; 1298e50e5129SAndreas Dilger map.m_len = max_blocks -= ret; 1299e50e5129SAndreas Dilger 1300e50e5129SAndreas Dilger ret = ext4_map_blocks(handle, ea_inode, &map, 1301e50e5129SAndreas Dilger EXT4_GET_BLOCKS_CREATE); 1302e50e5129SAndreas Dilger if (ret <= 0) { 1303e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1304e50e5129SAndreas Dilger if (ret == -ENOSPC && 1305e50e5129SAndreas Dilger ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { 1306e50e5129SAndreas Dilger ret = 0; 1307e50e5129SAndreas Dilger goto retry; 1308e50e5129SAndreas Dilger } 1309e50e5129SAndreas Dilger break; 1310e50e5129SAndreas Dilger } 1311e50e5129SAndreas Dilger } 1312e50e5129SAndreas Dilger 1313e50e5129SAndreas Dilger if (ret < 0) 1314e50e5129SAndreas Dilger return ret; 1315e50e5129SAndreas Dilger 1316e50e5129SAndreas Dilger block = 0; 1317e50e5129SAndreas Dilger while (wsize < bufsize) { 1318e50e5129SAndreas Dilger if (bh != NULL) 1319e50e5129SAndreas Dilger brelse(bh); 1320e50e5129SAndreas Dilger csize = (bufsize - wsize) > blocksize ? blocksize : 1321e50e5129SAndreas Dilger bufsize - wsize; 1322e50e5129SAndreas Dilger bh = ext4_getblk(handle, ea_inode, block, 0); 1323e50e5129SAndreas Dilger if (IS_ERR(bh)) 1324e50e5129SAndreas Dilger return PTR_ERR(bh); 1325e50e5129SAndreas Dilger ret = ext4_journal_get_write_access(handle, bh); 1326e50e5129SAndreas Dilger if (ret) 1327e50e5129SAndreas Dilger goto out; 1328e50e5129SAndreas Dilger 1329e50e5129SAndreas Dilger memcpy(bh->b_data, buf, csize); 1330e50e5129SAndreas Dilger set_buffer_uptodate(bh); 1331e50e5129SAndreas Dilger ext4_handle_dirty_metadata(handle, ea_inode, bh); 1332e50e5129SAndreas Dilger 1333e50e5129SAndreas Dilger buf += csize; 1334e50e5129SAndreas Dilger wsize += csize; 1335e50e5129SAndreas Dilger block += 1; 1336e50e5129SAndreas Dilger } 1337e50e5129SAndreas Dilger 1338e50e5129SAndreas Dilger inode_lock(ea_inode); 1339e50e5129SAndreas Dilger i_size_write(ea_inode, wsize); 1340e50e5129SAndreas Dilger ext4_update_i_disksize(ea_inode, wsize); 1341e50e5129SAndreas Dilger inode_unlock(ea_inode); 1342e50e5129SAndreas Dilger 1343e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1344e50e5129SAndreas Dilger 1345e50e5129SAndreas Dilger out: 1346e50e5129SAndreas Dilger brelse(bh); 1347e50e5129SAndreas Dilger 1348e50e5129SAndreas Dilger return ret; 1349e50e5129SAndreas Dilger } 1350e50e5129SAndreas Dilger 1351e50e5129SAndreas Dilger /* 1352e50e5129SAndreas Dilger * Create an inode to store the value of a large EA. 1353e50e5129SAndreas Dilger */ 1354e50e5129SAndreas Dilger static struct inode *ext4_xattr_inode_create(handle_t *handle, 1355dec214d0STahsin Erdogan struct inode *inode, u32 hash) 1356e50e5129SAndreas Dilger { 1357e50e5129SAndreas Dilger struct inode *ea_inode = NULL; 13589e1ba001STahsin Erdogan uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; 1359bd3b963bSTahsin Erdogan int err; 1360e50e5129SAndreas Dilger 1361e50e5129SAndreas Dilger /* 1362e50e5129SAndreas Dilger * Let the next inode be the goal, so we try and allocate the EA inode 1363e50e5129SAndreas Dilger * in the same group, or nearby one. 1364e50e5129SAndreas Dilger */ 1365e50e5129SAndreas Dilger ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, 13669e1ba001STahsin Erdogan S_IFREG | 0600, NULL, inode->i_ino + 1, owner, 13671b917ed8STahsin Erdogan EXT4_EA_INODE_FL); 1368e50e5129SAndreas Dilger if (!IS_ERR(ea_inode)) { 1369e50e5129SAndreas Dilger ea_inode->i_op = &ext4_file_inode_operations; 1370e50e5129SAndreas Dilger ea_inode->i_fop = &ext4_file_operations; 1371e50e5129SAndreas Dilger ext4_set_aops(ea_inode); 137233d201e0STahsin Erdogan ext4_xattr_inode_set_class(ea_inode); 1373e50e5129SAndreas Dilger unlock_new_inode(ea_inode); 1374dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, 1); 1375dec214d0STahsin Erdogan ext4_xattr_inode_set_hash(ea_inode, hash); 1376dec214d0STahsin Erdogan err = ext4_mark_inode_dirty(handle, ea_inode); 1377dec214d0STahsin Erdogan if (!err) 1378bd3b963bSTahsin Erdogan err = ext4_inode_attach_jinode(ea_inode); 1379bd3b963bSTahsin Erdogan if (err) { 1380bd3b963bSTahsin Erdogan iput(ea_inode); 1381bd3b963bSTahsin Erdogan return ERR_PTR(err); 1382bd3b963bSTahsin Erdogan } 1383dec214d0STahsin Erdogan 1384dec214d0STahsin Erdogan /* 1385dec214d0STahsin Erdogan * Xattr inodes are shared therefore quota charging is performed 1386dec214d0STahsin Erdogan * at a higher level. 1387dec214d0STahsin Erdogan */ 1388dec214d0STahsin Erdogan dquot_free_inode(ea_inode); 1389dec214d0STahsin Erdogan dquot_drop(ea_inode); 1390dec214d0STahsin Erdogan inode_lock(ea_inode); 1391dec214d0STahsin Erdogan ea_inode->i_flags |= S_NOQUOTA; 1392dec214d0STahsin Erdogan inode_unlock(ea_inode); 1393e50e5129SAndreas Dilger } 1394e50e5129SAndreas Dilger 1395e50e5129SAndreas Dilger return ea_inode; 1396e50e5129SAndreas Dilger } 1397e50e5129SAndreas Dilger 1398dec214d0STahsin Erdogan static struct inode * 1399dec214d0STahsin Erdogan ext4_xattr_inode_cache_find(struct inode *inode, const void *value, 1400dec214d0STahsin Erdogan size_t value_len, u32 hash) 1401e50e5129SAndreas Dilger { 1402dec214d0STahsin Erdogan struct inode *ea_inode; 1403dec214d0STahsin Erdogan struct mb_cache_entry *ce; 1404dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 1405dec214d0STahsin Erdogan void *ea_data; 1406e50e5129SAndreas Dilger 1407*cdb7ee4cSTahsin Erdogan if (!ea_inode_cache) 1408*cdb7ee4cSTahsin Erdogan return NULL; 1409*cdb7ee4cSTahsin Erdogan 1410dec214d0STahsin Erdogan ce = mb_cache_entry_find_first(ea_inode_cache, hash); 1411dec214d0STahsin Erdogan if (!ce) 1412dec214d0STahsin Erdogan return NULL; 1413e50e5129SAndreas Dilger 1414dec214d0STahsin Erdogan ea_data = ext4_kvmalloc(value_len, GFP_NOFS); 1415dec214d0STahsin Erdogan if (!ea_data) { 1416dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1417dec214d0STahsin Erdogan return NULL; 1418dec214d0STahsin Erdogan } 1419dec214d0STahsin Erdogan 1420dec214d0STahsin Erdogan while (ce) { 1421dec214d0STahsin Erdogan ea_inode = ext4_iget(inode->i_sb, ce->e_value); 1422dec214d0STahsin Erdogan if (!IS_ERR(ea_inode) && 1423dec214d0STahsin Erdogan !is_bad_inode(ea_inode) && 1424dec214d0STahsin Erdogan (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && 1425dec214d0STahsin Erdogan i_size_read(ea_inode) == value_len && 1426dec214d0STahsin Erdogan !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && 1427b9fc761eSTahsin Erdogan !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, 1428dec214d0STahsin Erdogan value_len) && 1429dec214d0STahsin Erdogan !memcmp(value, ea_data, value_len)) { 1430dec214d0STahsin Erdogan mb_cache_entry_touch(ea_inode_cache, ce); 1431dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1432dec214d0STahsin Erdogan kvfree(ea_data); 1433dec214d0STahsin Erdogan return ea_inode; 1434dec214d0STahsin Erdogan } 1435dec214d0STahsin Erdogan 1436dec214d0STahsin Erdogan if (!IS_ERR(ea_inode)) 1437e50e5129SAndreas Dilger iput(ea_inode); 1438dec214d0STahsin Erdogan ce = mb_cache_entry_find_next(ea_inode_cache, ce); 1439dec214d0STahsin Erdogan } 1440dec214d0STahsin Erdogan kvfree(ea_data); 1441dec214d0STahsin Erdogan return NULL; 1442e50e5129SAndreas Dilger } 1443e50e5129SAndreas Dilger 1444e50e5129SAndreas Dilger /* 1445e50e5129SAndreas Dilger * Add value of the EA in an inode. 1446e50e5129SAndreas Dilger */ 1447dec214d0STahsin Erdogan static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, 1448dec214d0STahsin Erdogan const void *value, size_t value_len, 1449dec214d0STahsin Erdogan struct inode **ret_inode) 1450e50e5129SAndreas Dilger { 1451e50e5129SAndreas Dilger struct inode *ea_inode; 1452dec214d0STahsin Erdogan u32 hash; 1453e50e5129SAndreas Dilger int err; 1454e50e5129SAndreas Dilger 1455dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); 1456dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); 1457dec214d0STahsin Erdogan if (ea_inode) { 1458dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1459dec214d0STahsin Erdogan if (err) { 1460dec214d0STahsin Erdogan iput(ea_inode); 1461dec214d0STahsin Erdogan return err; 1462dec214d0STahsin Erdogan } 1463dec214d0STahsin Erdogan 1464dec214d0STahsin Erdogan *ret_inode = ea_inode; 1465dec214d0STahsin Erdogan return 0; 1466dec214d0STahsin Erdogan } 1467dec214d0STahsin Erdogan 1468e50e5129SAndreas Dilger /* Create an inode for the EA value */ 1469dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_create(handle, inode, hash); 1470e50e5129SAndreas Dilger if (IS_ERR(ea_inode)) 1471e50e5129SAndreas Dilger return PTR_ERR(ea_inode); 1472e50e5129SAndreas Dilger 1473e50e5129SAndreas Dilger err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); 1474dec214d0STahsin Erdogan if (err) { 1475dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref(handle, ea_inode); 1476e50e5129SAndreas Dilger iput(ea_inode); 1477e50e5129SAndreas Dilger return err; 1478e50e5129SAndreas Dilger } 1479e50e5129SAndreas Dilger 1480*cdb7ee4cSTahsin Erdogan if (EA_INODE_CACHE(inode)) 1481dec214d0STahsin Erdogan mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, 1482dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 1483dec214d0STahsin Erdogan 1484dec214d0STahsin Erdogan *ret_inode = ea_inode; 1485dec214d0STahsin Erdogan return 0; 1486dec214d0STahsin Erdogan } 1487dec214d0STahsin Erdogan 14889c6e7853STahsin Erdogan /* 14899c6e7853STahsin Erdogan * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode 14909c6e7853STahsin Erdogan * feature is enabled. 14919c6e7853STahsin Erdogan */ 14929c6e7853STahsin Erdogan #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) 14939c6e7853STahsin Erdogan 1494e50e5129SAndreas Dilger static int ext4_xattr_set_entry(struct ext4_xattr_info *i, 1495e50e5129SAndreas Dilger struct ext4_xattr_search *s, 1496daf83281STahsin Erdogan handle_t *handle, struct inode *inode, 1497daf83281STahsin Erdogan bool is_block) 1498ac27a0ecSDave Kleikamp { 1499617ba13bSMingming Cao struct ext4_xattr_entry *last; 1500dec214d0STahsin Erdogan struct ext4_xattr_entry *here = s->here; 1501dec214d0STahsin Erdogan size_t min_offs = s->end - s->base, name_len = strlen(i->name); 1502e50e5129SAndreas Dilger int in_inode = i->in_inode; 1503dec214d0STahsin Erdogan struct inode *old_ea_inode = NULL; 1504dec214d0STahsin Erdogan struct inode *new_ea_inode = NULL; 1505dec214d0STahsin Erdogan size_t old_size, new_size; 1506dec214d0STahsin Erdogan int ret; 1507dec214d0STahsin Erdogan 1508dec214d0STahsin Erdogan /* Space used by old and new values. */ 1509dec214d0STahsin Erdogan old_size = (!s->not_found && !here->e_value_inum) ? 1510dec214d0STahsin Erdogan EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; 1511dec214d0STahsin Erdogan new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; 1512dec214d0STahsin Erdogan 1513dec214d0STahsin Erdogan /* 1514dec214d0STahsin Erdogan * Optimization for the simple case when old and new values have the 1515dec214d0STahsin Erdogan * same padded sizes. Not applicable if external inodes are involved. 1516dec214d0STahsin Erdogan */ 1517dec214d0STahsin Erdogan if (new_size && new_size == old_size) { 1518dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1519dec214d0STahsin Erdogan void *val = s->base + offs; 1520dec214d0STahsin Erdogan 1521dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1522dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1523dec214d0STahsin Erdogan memset(val, 0, new_size); 1524dec214d0STahsin Erdogan } else { 1525dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1526dec214d0STahsin Erdogan /* Clear padding bytes. */ 1527dec214d0STahsin Erdogan memset(val + i->value_len, 0, new_size - i->value_len); 1528dec214d0STahsin Erdogan } 1529dec214d0STahsin Erdogan return 0; 1530dec214d0STahsin Erdogan } 1531e50e5129SAndreas Dilger 1532ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 1533ac27a0ecSDave Kleikamp last = s->first; 1534617ba13bSMingming Cao for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1535e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 1536ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 1537ac27a0ecSDave Kleikamp if (offs < min_offs) 1538ac27a0ecSDave Kleikamp min_offs = offs; 1539ac27a0ecSDave Kleikamp } 1540ac27a0ecSDave Kleikamp } 1541dec214d0STahsin Erdogan 1542dec214d0STahsin Erdogan /* Check whether we have enough space. */ 1543ac27a0ecSDave Kleikamp if (i->value) { 1544dec214d0STahsin Erdogan size_t free; 1545e50e5129SAndreas Dilger 1546dec214d0STahsin Erdogan free = min_offs - ((void *)last - s->base) - sizeof(__u32); 1547dec214d0STahsin Erdogan if (!s->not_found) 1548dec214d0STahsin Erdogan free += EXT4_XATTR_LEN(name_len) + old_size; 1549e50e5129SAndreas Dilger 1550dec214d0STahsin Erdogan if (free < EXT4_XATTR_LEN(name_len) + new_size) { 1551dec214d0STahsin Erdogan ret = -ENOSPC; 1552dec214d0STahsin Erdogan goto out; 1553dec214d0STahsin Erdogan } 15549c6e7853STahsin Erdogan 15559c6e7853STahsin Erdogan /* 15569c6e7853STahsin Erdogan * If storing the value in an external inode is an option, 15579c6e7853STahsin Erdogan * reserve space for xattr entries/names in the external 15589c6e7853STahsin Erdogan * attribute block so that a long value does not occupy the 15599c6e7853STahsin Erdogan * whole space and prevent futher entries being added. 15609c6e7853STahsin Erdogan */ 1561daf83281STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 1562daf83281STahsin Erdogan new_size && is_block && 15639c6e7853STahsin Erdogan (min_offs + old_size - new_size) < 15649c6e7853STahsin Erdogan EXT4_XATTR_BLOCK_RESERVE(inode)) { 15659c6e7853STahsin Erdogan ret = -ENOSPC; 15669c6e7853STahsin Erdogan goto out; 15679c6e7853STahsin Erdogan } 1568ac27a0ecSDave Kleikamp } 1569ac27a0ecSDave Kleikamp 1570dec214d0STahsin Erdogan /* 1571dec214d0STahsin Erdogan * Getting access to old and new ea inodes is subject to failures. 1572dec214d0STahsin Erdogan * Finish that work before doing any modifications to the xattr data. 1573dec214d0STahsin Erdogan */ 1574dec214d0STahsin Erdogan if (!s->not_found && here->e_value_inum) { 1575dec214d0STahsin Erdogan ret = ext4_xattr_inode_iget(inode, 1576dec214d0STahsin Erdogan le32_to_cpu(here->e_value_inum), 1577dec214d0STahsin Erdogan &old_ea_inode); 1578dec214d0STahsin Erdogan if (ret) { 1579dec214d0STahsin Erdogan old_ea_inode = NULL; 1580dec214d0STahsin Erdogan goto out; 1581bd9926e8STheodore Ts'o } 1582dec214d0STahsin Erdogan } 1583dec214d0STahsin Erdogan if (i->value && in_inode) { 1584dec214d0STahsin Erdogan WARN_ON_ONCE(!i->value_len); 1585dec214d0STahsin Erdogan 1586dec214d0STahsin Erdogan ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); 1587dec214d0STahsin Erdogan if (ret) 1588dec214d0STahsin Erdogan goto out; 1589dec214d0STahsin Erdogan 1590dec214d0STahsin Erdogan ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, 1591dec214d0STahsin Erdogan i->value_len, 1592dec214d0STahsin Erdogan &new_ea_inode); 1593dec214d0STahsin Erdogan if (ret) { 1594dec214d0STahsin Erdogan new_ea_inode = NULL; 1595dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, i->value_len); 1596dec214d0STahsin Erdogan goto out; 1597dec214d0STahsin Erdogan } 1598ac27a0ecSDave Kleikamp } 1599ac27a0ecSDave Kleikamp 1600dec214d0STahsin Erdogan if (old_ea_inode) { 1601dec214d0STahsin Erdogan /* We are ready to release ref count on the old_ea_inode. */ 1602dec214d0STahsin Erdogan ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); 1603dec214d0STahsin Erdogan if (ret) { 1604dec214d0STahsin Erdogan /* Release newly required ref count on new_ea_inode. */ 1605dec214d0STahsin Erdogan if (new_ea_inode) { 1606dec214d0STahsin Erdogan int err; 1607dec214d0STahsin Erdogan 1608dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, 1609dec214d0STahsin Erdogan new_ea_inode); 1610dec214d0STahsin Erdogan if (err) 1611dec214d0STahsin Erdogan ext4_warning_inode(new_ea_inode, 1612dec214d0STahsin Erdogan "dec ref new_ea_inode err=%d", 1613dec214d0STahsin Erdogan err); 1614dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 1615dec214d0STahsin Erdogan i->value_len); 1616dec214d0STahsin Erdogan } 1617dec214d0STahsin Erdogan goto out; 1618dec214d0STahsin Erdogan } 1619dec214d0STahsin Erdogan 1620dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 1621dec214d0STahsin Erdogan le32_to_cpu(here->e_value_size)); 1622dec214d0STahsin Erdogan } 1623dec214d0STahsin Erdogan 1624dec214d0STahsin Erdogan /* No failures allowed past this point. */ 1625dec214d0STahsin Erdogan 1626dec214d0STahsin Erdogan if (!s->not_found && here->e_value_offs) { 1627ac27a0ecSDave Kleikamp /* Remove the old value. */ 1628dec214d0STahsin Erdogan void *first_val = s->base + min_offs; 1629dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1630dec214d0STahsin Erdogan void *val = s->base + offs; 1631dec214d0STahsin Erdogan 1632dec214d0STahsin Erdogan memmove(first_val + old_size, first_val, val - first_val); 1633dec214d0STahsin Erdogan memset(first_val, 0, old_size); 1634dec214d0STahsin Erdogan min_offs += old_size; 1635ac27a0ecSDave Kleikamp 1636ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 1637ac27a0ecSDave Kleikamp last = s->first; 1638ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 1639ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 1640dec214d0STahsin Erdogan 1641e50e5129SAndreas Dilger if (!last->e_value_inum && 1642e50e5129SAndreas Dilger last->e_value_size && o < offs) 1643dec214d0STahsin Erdogan last->e_value_offs = cpu_to_le16(o + old_size); 1644617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 1645ac27a0ecSDave Kleikamp } 1646ac27a0ecSDave Kleikamp } 1647dec214d0STahsin Erdogan 1648ac27a0ecSDave Kleikamp if (!i->value) { 1649dec214d0STahsin Erdogan /* Remove old name. */ 1650617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 1651dec214d0STahsin Erdogan 1652ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 1653dec214d0STahsin Erdogan memmove(here, (void *)here + size, 1654dec214d0STahsin Erdogan (void *)last - (void *)here + sizeof(__u32)); 1655ac27a0ecSDave Kleikamp memset(last, 0, size); 1656dec214d0STahsin Erdogan } else if (s->not_found) { 1657dec214d0STahsin Erdogan /* Insert new name. */ 1658dec214d0STahsin Erdogan size_t size = EXT4_XATTR_LEN(name_len); 1659dec214d0STahsin Erdogan size_t rest = (void *)last - (void *)here + sizeof(__u32); 1660dec214d0STahsin Erdogan 1661dec214d0STahsin Erdogan memmove((void *)here + size, here, rest); 1662dec214d0STahsin Erdogan memset(here, 0, size); 1663dec214d0STahsin Erdogan here->e_name_index = i->name_index; 1664dec214d0STahsin Erdogan here->e_name_len = name_len; 1665dec214d0STahsin Erdogan memcpy(here->e_name, i->name, name_len); 1666dec214d0STahsin Erdogan } else { 1667dec214d0STahsin Erdogan /* This is an update, reset value info. */ 1668dec214d0STahsin Erdogan here->e_value_inum = 0; 1669dec214d0STahsin Erdogan here->e_value_offs = 0; 1670dec214d0STahsin Erdogan here->e_value_size = 0; 1671ac27a0ecSDave Kleikamp } 1672ac27a0ecSDave Kleikamp 1673ac27a0ecSDave Kleikamp if (i->value) { 1674dec214d0STahsin Erdogan /* Insert new value. */ 1675e50e5129SAndreas Dilger if (in_inode) { 1676dec214d0STahsin Erdogan here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); 1677e50e5129SAndreas Dilger } else if (i->value_len) { 1678dec214d0STahsin Erdogan void *val = s->base + min_offs - new_size; 1679e50e5129SAndreas Dilger 1680dec214d0STahsin Erdogan here->e_value_offs = cpu_to_le16(min_offs - new_size); 1681dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1682dec214d0STahsin Erdogan memset(val, 0, new_size); 1683dec214d0STahsin Erdogan } else { 1684dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1685dec214d0STahsin Erdogan /* Clear padding bytes. */ 1686dec214d0STahsin Erdogan memset(val + i->value_len, 0, 1687dec214d0STahsin Erdogan new_size - i->value_len); 1688dec214d0STahsin Erdogan } 1689dec214d0STahsin Erdogan } 1690dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1691dec214d0STahsin Erdogan } 1692daf83281STahsin Erdogan 1693b9fc761eSTahsin Erdogan if (i->value) { 1694b9fc761eSTahsin Erdogan __le32 hash = 0; 1695b9fc761eSTahsin Erdogan 1696b9fc761eSTahsin Erdogan /* Entry hash calculation. */ 1697b9fc761eSTahsin Erdogan if (in_inode) { 1698b9fc761eSTahsin Erdogan __le32 crc32c_hash; 1699b9fc761eSTahsin Erdogan 1700b9fc761eSTahsin Erdogan /* 1701b9fc761eSTahsin Erdogan * Feed crc32c hash instead of the raw value for entry 1702b9fc761eSTahsin Erdogan * hash calculation. This is to avoid walking 1703b9fc761eSTahsin Erdogan * potentially long value buffer again. 1704b9fc761eSTahsin Erdogan */ 1705b9fc761eSTahsin Erdogan crc32c_hash = cpu_to_le32( 1706b9fc761eSTahsin Erdogan ext4_xattr_inode_get_hash(new_ea_inode)); 1707b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1708b9fc761eSTahsin Erdogan here->e_name_len, 1709b9fc761eSTahsin Erdogan &crc32c_hash, 1); 1710b9fc761eSTahsin Erdogan } else if (is_block) { 1711b9fc761eSTahsin Erdogan __le32 *value = s->base + min_offs - new_size; 1712b9fc761eSTahsin Erdogan 1713b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1714b9fc761eSTahsin Erdogan here->e_name_len, value, 1715b9fc761eSTahsin Erdogan new_size >> 2); 1716daf83281STahsin Erdogan } 1717b9fc761eSTahsin Erdogan here->e_hash = hash; 1718b9fc761eSTahsin Erdogan } 1719b9fc761eSTahsin Erdogan 1720b9fc761eSTahsin Erdogan if (is_block) 1721b9fc761eSTahsin Erdogan ext4_xattr_rehash((struct ext4_xattr_header *)s->base); 1722daf83281STahsin Erdogan 1723dec214d0STahsin Erdogan ret = 0; 1724e50e5129SAndreas Dilger out: 1725dec214d0STahsin Erdogan iput(old_ea_inode); 1726dec214d0STahsin Erdogan iput(new_ea_inode); 1727dec214d0STahsin Erdogan return ret; 1728ac27a0ecSDave Kleikamp } 1729ac27a0ecSDave Kleikamp 1730617ba13bSMingming Cao struct ext4_xattr_block_find { 1731617ba13bSMingming Cao struct ext4_xattr_search s; 1732ac27a0ecSDave Kleikamp struct buffer_head *bh; 1733ac27a0ecSDave Kleikamp }; 1734ac27a0ecSDave Kleikamp 1735ac27a0ecSDave Kleikamp static int 1736617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 1737617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1738ac27a0ecSDave Kleikamp { 1739ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1740ac27a0ecSDave Kleikamp int error; 1741ac27a0ecSDave Kleikamp 1742ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 1743ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 1744ac27a0ecSDave Kleikamp 1745617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 1746ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 1747617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 1748ac27a0ecSDave Kleikamp error = -EIO; 1749ac27a0ecSDave Kleikamp if (!bs->bh) 1750ac27a0ecSDave Kleikamp goto cleanup; 1751ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 1752ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 1753ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 1754cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bs->bh)) { 175524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 175624676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 17576a797d27SDarrick J. Wong error = -EFSCORRUPTED; 1758ac27a0ecSDave Kleikamp goto cleanup; 1759ac27a0ecSDave Kleikamp } 1760ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1761ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 1762ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 1763ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 1764ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 1765617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 17666ba644b9SEric Biggers i->name, 1); 1767ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1768ac27a0ecSDave Kleikamp goto cleanup; 1769ac27a0ecSDave Kleikamp bs->s.not_found = error; 1770ac27a0ecSDave Kleikamp } 1771ac27a0ecSDave Kleikamp error = 0; 1772ac27a0ecSDave Kleikamp 1773ac27a0ecSDave Kleikamp cleanup: 1774ac27a0ecSDave Kleikamp return error; 1775ac27a0ecSDave Kleikamp } 1776ac27a0ecSDave Kleikamp 1777ac27a0ecSDave Kleikamp static int 1778617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 1779617ba13bSMingming Cao struct ext4_xattr_info *i, 1780617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1781ac27a0ecSDave Kleikamp { 1782ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1783ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 1784b347e2bcSTahsin Erdogan struct ext4_xattr_search s_copy = bs->s; 1785b347e2bcSTahsin Erdogan struct ext4_xattr_search *s = &s_copy; 17867a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 17878a2bfdcbSMingming Cao int error = 0; 178847387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 1789dec214d0STahsin Erdogan struct inode *ea_inode = NULL; 1790dec214d0STahsin Erdogan size_t old_ea_inode_size = 0; 1791ac27a0ecSDave Kleikamp 1792617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 1793ac27a0ecSDave Kleikamp 1794ac27a0ecSDave Kleikamp if (s->base) { 17955d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 17968a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 17978a2bfdcbSMingming Cao if (error) 17988a2bfdcbSMingming Cao goto cleanup; 17998a2bfdcbSMingming Cao lock_buffer(bs->bh); 18008a2bfdcbSMingming Cao 1801ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 180282939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 180382939d79SJan Kara 180482939d79SJan Kara /* 180582939d79SJan Kara * This must happen under buffer lock for 180682939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 180782939d79SJan Kara * block 180882939d79SJan Kara */ 1809*cdb7ee4cSTahsin Erdogan if (ea_block_cache) 181047387409STahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, 181182939d79SJan Kara bs->bh->b_blocknr); 1812ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 1813daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 1814daf83281STahsin Erdogan true /* is_block */); 1815daf83281STahsin Erdogan if (!error) 181647387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, 18179c191f70ST Makphaibulchoke bs->bh); 1818dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bs->bh); 1819ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 18206a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1821ac27a0ecSDave Kleikamp goto bad_block; 1822ac27a0ecSDave Kleikamp if (!error) 1823dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 18240390131bSFrank Mayhar inode, 1825ac27a0ecSDave Kleikamp bs->bh); 1826ac27a0ecSDave Kleikamp if (error) 1827ac27a0ecSDave Kleikamp goto cleanup; 1828ac27a0ecSDave Kleikamp goto inserted; 1829ac27a0ecSDave Kleikamp } else { 1830ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 1831ac27a0ecSDave Kleikamp 18328a2bfdcbSMingming Cao unlock_buffer(bs->bh); 1833ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 1834216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 1835ac27a0ecSDave Kleikamp error = -ENOMEM; 1836ac27a0ecSDave Kleikamp if (s->base == NULL) 1837ac27a0ecSDave Kleikamp goto cleanup; 1838ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 1839ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1840ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1841ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 1842ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 1843dec214d0STahsin Erdogan 1844dec214d0STahsin Erdogan /* 1845dec214d0STahsin Erdogan * If existing entry points to an xattr inode, we need 1846dec214d0STahsin Erdogan * to prevent ext4_xattr_set_entry() from decrementing 1847dec214d0STahsin Erdogan * ref count on it because the reference belongs to the 1848dec214d0STahsin Erdogan * original block. In this case, make the entry look 1849dec214d0STahsin Erdogan * like it has an empty value. 1850dec214d0STahsin Erdogan */ 1851dec214d0STahsin Erdogan if (!s->not_found && s->here->e_value_inum) { 1852dec214d0STahsin Erdogan /* 1853dec214d0STahsin Erdogan * Defer quota free call for previous inode 1854dec214d0STahsin Erdogan * until success is guaranteed. 1855dec214d0STahsin Erdogan */ 1856dec214d0STahsin Erdogan old_ea_inode_size = le32_to_cpu( 1857dec214d0STahsin Erdogan s->here->e_value_size); 1858dec214d0STahsin Erdogan s->here->e_value_inum = 0; 1859dec214d0STahsin Erdogan s->here->e_value_size = 0; 1860dec214d0STahsin Erdogan } 1861ac27a0ecSDave Kleikamp } 1862ac27a0ecSDave Kleikamp } else { 1863ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 1864216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 1865ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 1866ac27a0ecSDave Kleikamp error = -ENOMEM; 1867ac27a0ecSDave Kleikamp if (s->base == NULL) 1868ac27a0ecSDave Kleikamp goto cleanup; 1869617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 1870ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 1871ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1872ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1873ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 1874ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 1875ac27a0ecSDave Kleikamp } 1876ac27a0ecSDave Kleikamp 1877daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); 18786a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1879ac27a0ecSDave Kleikamp goto bad_block; 1880ac27a0ecSDave Kleikamp if (error) 1881ac27a0ecSDave Kleikamp goto cleanup; 1882dec214d0STahsin Erdogan 1883dec214d0STahsin Erdogan if (i->value && s->here->e_value_inum) { 1884dec214d0STahsin Erdogan unsigned int ea_ino; 1885dec214d0STahsin Erdogan 1886dec214d0STahsin Erdogan /* 1887dec214d0STahsin Erdogan * A ref count on ea_inode has been taken as part of the call to 1888dec214d0STahsin Erdogan * ext4_xattr_set_entry() above. We would like to drop this 1889dec214d0STahsin Erdogan * extra ref but we have to wait until the xattr block is 1890dec214d0STahsin Erdogan * initialized and has its own ref count on the ea_inode. 1891dec214d0STahsin Erdogan */ 1892dec214d0STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 1893dec214d0STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, &ea_inode); 1894dec214d0STahsin Erdogan if (error) { 1895dec214d0STahsin Erdogan ea_inode = NULL; 1896dec214d0STahsin Erdogan goto cleanup; 1897dec214d0STahsin Erdogan } 1898dec214d0STahsin Erdogan } 1899dec214d0STahsin Erdogan 1900ac27a0ecSDave Kleikamp inserted: 1901ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 190247387409STahsin Erdogan new_bh = ext4_xattr_block_cache_find(inode, header(s->base), 190347387409STahsin Erdogan &ce); 1904ac27a0ecSDave Kleikamp if (new_bh) { 1905ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 1906ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 1907ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 1908ac27a0ecSDave Kleikamp else { 19096048c64bSAndreas Gruenbacher u32 ref; 19106048c64bSAndreas Gruenbacher 1911b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 1912b8cb5a54STahsin Erdogan 1913ac27a0ecSDave Kleikamp /* The old block is released after updating 1914ac27a0ecSDave Kleikamp the inode. */ 19151231b3a1SLukas Czerner error = dquot_alloc_block(inode, 19161231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 19175dd4056dSChristoph Hellwig if (error) 1918ac27a0ecSDave Kleikamp goto cleanup; 19195d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 1920617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 1921ac27a0ecSDave Kleikamp new_bh); 1922ac27a0ecSDave Kleikamp if (error) 1923ac27a0ecSDave Kleikamp goto cleanup_dquot; 1924ac27a0ecSDave Kleikamp lock_buffer(new_bh); 192582939d79SJan Kara /* 192682939d79SJan Kara * We have to be careful about races with 19276048c64bSAndreas Gruenbacher * freeing, rehashing or adding references to 19286048c64bSAndreas Gruenbacher * xattr block. Once we hold buffer lock xattr 19296048c64bSAndreas Gruenbacher * block's state is stable so we can check 19306048c64bSAndreas Gruenbacher * whether the block got freed / rehashed or 19316048c64bSAndreas Gruenbacher * not. Since we unhash mbcache entry under 19326048c64bSAndreas Gruenbacher * buffer lock when freeing / rehashing xattr 19336048c64bSAndreas Gruenbacher * block, checking whether entry is still 19346048c64bSAndreas Gruenbacher * hashed is reliable. Same rules hold for 19356048c64bSAndreas Gruenbacher * e_reusable handling. 193682939d79SJan Kara */ 19376048c64bSAndreas Gruenbacher if (hlist_bl_unhashed(&ce->e_hash_list) || 19386048c64bSAndreas Gruenbacher !ce->e_reusable) { 193982939d79SJan Kara /* 194082939d79SJan Kara * Undo everything and check mbcache 194182939d79SJan Kara * again. 194282939d79SJan Kara */ 194382939d79SJan Kara unlock_buffer(new_bh); 194482939d79SJan Kara dquot_free_block(inode, 194582939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 194682939d79SJan Kara 1)); 194782939d79SJan Kara brelse(new_bh); 194847387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 194982939d79SJan Kara ce = NULL; 195082939d79SJan Kara new_bh = NULL; 195182939d79SJan Kara goto inserted; 195282939d79SJan Kara } 19536048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 19546048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 19556048c64bSAndreas Gruenbacher if (ref >= EXT4_XATTR_REFCOUNT_MAX) 19566048c64bSAndreas Gruenbacher ce->e_reusable = 0; 1957ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 19586048c64bSAndreas Gruenbacher ref); 1959dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 1960ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 1961dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 19620390131bSFrank Mayhar inode, 1963ac27a0ecSDave Kleikamp new_bh); 1964ac27a0ecSDave Kleikamp if (error) 1965ac27a0ecSDave Kleikamp goto cleanup_dquot; 1966ac27a0ecSDave Kleikamp } 196747387409STahsin Erdogan mb_cache_entry_touch(ea_block_cache, ce); 196847387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 1969ac27a0ecSDave Kleikamp ce = NULL; 1970ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 1971ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 1972ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 1973ac27a0ecSDave Kleikamp new_bh = bs->bh; 1974ac27a0ecSDave Kleikamp get_bh(new_bh); 1975ac27a0ecSDave Kleikamp } else { 1976ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 1977fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 1978fb0a387dSEric Sandeen 1979b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 1980b8cb5a54STahsin Erdogan 1981fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 1982d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 1983fb0a387dSEric Sandeen 1984fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 198512e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 1986fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 1987fb0a387dSEric Sandeen 198855f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 198955f020dbSAllison Henderson NULL, &error); 1990ac27a0ecSDave Kleikamp if (error) 1991ac27a0ecSDave Kleikamp goto cleanup; 1992fb0a387dSEric Sandeen 199312e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 1994fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 1995fb0a387dSEric Sandeen 1996ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 1997ace36ad4SJoe Perches (unsigned long long)block); 1998ac27a0ecSDave Kleikamp 1999ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 2000aebf0243SWang Shilong if (unlikely(!new_bh)) { 2001860d21e2STheodore Ts'o error = -ENOMEM; 2002ac27a0ecSDave Kleikamp getblk_failed: 20037dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 2004e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 2005ac27a0ecSDave Kleikamp goto cleanup; 2006ac27a0ecSDave Kleikamp } 2007dec214d0STahsin Erdogan error = ext4_xattr_inode_inc_ref_all(handle, inode, 2008dec214d0STahsin Erdogan ENTRY(header(s->base)+1)); 2009dec214d0STahsin Erdogan if (error) 2010dec214d0STahsin Erdogan goto getblk_failed; 2011dec214d0STahsin Erdogan if (ea_inode) { 2012dec214d0STahsin Erdogan /* Drop the extra ref on ea_inode. */ 2013dec214d0STahsin Erdogan error = ext4_xattr_inode_dec_ref(handle, 2014dec214d0STahsin Erdogan ea_inode); 2015dec214d0STahsin Erdogan if (error) 2016dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 2017dec214d0STahsin Erdogan "dec ref error=%d", 2018dec214d0STahsin Erdogan error); 2019dec214d0STahsin Erdogan iput(ea_inode); 2020dec214d0STahsin Erdogan ea_inode = NULL; 2021dec214d0STahsin Erdogan } 2022dec214d0STahsin Erdogan 2023ac27a0ecSDave Kleikamp lock_buffer(new_bh); 2024617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 2025ac27a0ecSDave Kleikamp if (error) { 2026ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2027860d21e2STheodore Ts'o error = -EIO; 2028ac27a0ecSDave Kleikamp goto getblk_failed; 2029ac27a0ecSDave Kleikamp } 2030ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 2031dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2032ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 2033ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 203447387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, new_bh); 2035dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, 2036dac7a4b4STheodore Ts'o new_bh); 2037ac27a0ecSDave Kleikamp if (error) 2038ac27a0ecSDave Kleikamp goto cleanup; 2039ac27a0ecSDave Kleikamp } 2040ac27a0ecSDave Kleikamp } 2041ac27a0ecSDave Kleikamp 2042dec214d0STahsin Erdogan if (old_ea_inode_size) 2043dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, old_ea_inode_size); 2044dec214d0STahsin Erdogan 2045ac27a0ecSDave Kleikamp /* Update the inode. */ 2046617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 2047ac27a0ecSDave Kleikamp 2048ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 2049dec214d0STahsin Erdogan if (bs->bh && bs->bh != new_bh) { 2050dec214d0STahsin Erdogan struct ext4_xattr_inode_array *ea_inode_array = NULL; 2051dec214d0STahsin Erdogan 2052dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bs->bh, 2053dec214d0STahsin Erdogan &ea_inode_array, 2054dec214d0STahsin Erdogan 0 /* extra_credits */); 2055dec214d0STahsin Erdogan ext4_xattr_inode_array_free(ea_inode_array); 2056dec214d0STahsin Erdogan } 2057ac27a0ecSDave Kleikamp error = 0; 2058ac27a0ecSDave Kleikamp 2059ac27a0ecSDave Kleikamp cleanup: 2060dec214d0STahsin Erdogan if (ea_inode) { 2061dec214d0STahsin Erdogan int error2; 2062dec214d0STahsin Erdogan 2063dec214d0STahsin Erdogan error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); 2064dec214d0STahsin Erdogan if (error2) 2065dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "dec ref error=%d", 2066dec214d0STahsin Erdogan error2); 2067dec214d0STahsin Erdogan 2068dec214d0STahsin Erdogan /* If there was an error, revert the quota charge. */ 2069dec214d0STahsin Erdogan if (error) 2070dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 2071dec214d0STahsin Erdogan i_size_read(ea_inode)); 2072dec214d0STahsin Erdogan iput(ea_inode); 2073dec214d0STahsin Erdogan } 2074ac27a0ecSDave Kleikamp if (ce) 207547387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2076ac27a0ecSDave Kleikamp brelse(new_bh); 2077ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 2078ac27a0ecSDave Kleikamp kfree(s->base); 2079ac27a0ecSDave Kleikamp 2080ac27a0ecSDave Kleikamp return error; 2081ac27a0ecSDave Kleikamp 2082ac27a0ecSDave Kleikamp cleanup_dquot: 20831231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 2084ac27a0ecSDave Kleikamp goto cleanup; 2085ac27a0ecSDave Kleikamp 2086ac27a0ecSDave Kleikamp bad_block: 208724676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 208824676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2089ac27a0ecSDave Kleikamp goto cleanup; 2090ac27a0ecSDave Kleikamp 2091ac27a0ecSDave Kleikamp #undef header 2092ac27a0ecSDave Kleikamp } 2093ac27a0ecSDave Kleikamp 2094879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 2095617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2096ac27a0ecSDave Kleikamp { 2097617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2098617ba13bSMingming Cao struct ext4_inode *raw_inode; 2099ac27a0ecSDave Kleikamp int error; 2100ac27a0ecSDave Kleikamp 2101617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 2102ac27a0ecSDave Kleikamp return 0; 2103617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 2104ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 2105ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 2106ac27a0ecSDave Kleikamp is->s.here = is->s.first; 2107617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 210819f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 21099e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 2110ac27a0ecSDave Kleikamp if (error) 2111ac27a0ecSDave Kleikamp return error; 2112ac27a0ecSDave Kleikamp /* Find the named attribute. */ 2113617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 21146ba644b9SEric Biggers i->name, 0); 2115ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 2116ac27a0ecSDave Kleikamp return error; 2117ac27a0ecSDave Kleikamp is->s.not_found = error; 2118ac27a0ecSDave Kleikamp } 2119ac27a0ecSDave Kleikamp return 0; 2120ac27a0ecSDave Kleikamp } 2121ac27a0ecSDave Kleikamp 21220d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 21230d812f77STao Ma struct ext4_xattr_info *i, 21240d812f77STao Ma struct ext4_xattr_ibody_find *is) 21250d812f77STao Ma { 21260d812f77STao Ma struct ext4_xattr_ibody_header *header; 21270d812f77STao Ma struct ext4_xattr_search *s = &is->s; 21280d812f77STao Ma int error; 21290d812f77STao Ma 21300d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 21310d812f77STao Ma return -ENOSPC; 2132daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 21330d812f77STao Ma if (error) { 21340d812f77STao Ma if (error == -ENOSPC && 21350d812f77STao Ma ext4_has_inline_data(inode)) { 21360d812f77STao Ma error = ext4_try_to_evict_inline_data(handle, inode, 21370d812f77STao Ma EXT4_XATTR_LEN(strlen(i->name) + 21380d812f77STao Ma EXT4_XATTR_SIZE(i->value_len))); 21390d812f77STao Ma if (error) 21400d812f77STao Ma return error; 21410d812f77STao Ma error = ext4_xattr_ibody_find(inode, i, is); 21420d812f77STao Ma if (error) 21430d812f77STao Ma return error; 2144daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 2145daf83281STahsin Erdogan false /* is_block */); 21460d812f77STao Ma } 21470d812f77STao Ma if (error) 21480d812f77STao Ma return error; 21490d812f77STao Ma } 21500d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 21510d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 21520d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 21530d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 21540d812f77STao Ma } else { 21550d812f77STao Ma header->h_magic = cpu_to_le32(0); 21560d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 21570d812f77STao Ma } 21580d812f77STao Ma return 0; 21590d812f77STao Ma } 21600d812f77STao Ma 2161e50e5129SAndreas Dilger static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 2162617ba13bSMingming Cao struct ext4_xattr_info *i, 2163617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2164ac27a0ecSDave Kleikamp { 2165617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2166617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 2167ac27a0ecSDave Kleikamp int error; 2168ac27a0ecSDave Kleikamp 2169617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 2170ac27a0ecSDave Kleikamp return -ENOSPC; 2171daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 2172ac27a0ecSDave Kleikamp if (error) 2173ac27a0ecSDave Kleikamp return error; 2174617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 2175ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 2176617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 217719f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 2178ac27a0ecSDave Kleikamp } else { 2179ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 218019f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 2181ac27a0ecSDave Kleikamp } 2182ac27a0ecSDave Kleikamp return 0; 2183ac27a0ecSDave Kleikamp } 2184ac27a0ecSDave Kleikamp 21853fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 21863fd16462SJan Kara struct ext4_xattr_info *i) 21873fd16462SJan Kara { 21883fd16462SJan Kara void *value; 21893fd16462SJan Kara 21900bd454c0STahsin Erdogan /* When e_value_inum is set the value is stored externally. */ 21910bd454c0STahsin Erdogan if (s->here->e_value_inum) 21920bd454c0STahsin Erdogan return 0; 21933fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 21943fd16462SJan Kara return 0; 21953fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 21963fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 21973fd16462SJan Kara } 21983fd16462SJan Kara 2199dec214d0STahsin Erdogan static struct buffer_head *ext4_xattr_get_block(struct inode *inode) 2200dec214d0STahsin Erdogan { 2201dec214d0STahsin Erdogan struct buffer_head *bh; 2202dec214d0STahsin Erdogan int error; 2203dec214d0STahsin Erdogan 2204dec214d0STahsin Erdogan if (!EXT4_I(inode)->i_file_acl) 2205dec214d0STahsin Erdogan return NULL; 2206dec214d0STahsin Erdogan bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 2207dec214d0STahsin Erdogan if (!bh) 2208dec214d0STahsin Erdogan return ERR_PTR(-EIO); 2209dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2210dec214d0STahsin Erdogan if (error) 2211dec214d0STahsin Erdogan return ERR_PTR(error); 2212dec214d0STahsin Erdogan return bh; 2213dec214d0STahsin Erdogan } 2214dec214d0STahsin Erdogan 2215ac27a0ecSDave Kleikamp /* 2216617ba13bSMingming Cao * ext4_xattr_set_handle() 2217ac27a0ecSDave Kleikamp * 22186e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 2219ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 2220ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 2221ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 2222ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 2223ac27a0ecSDave Kleikamp * previous to the call, respectively. 2224ac27a0ecSDave Kleikamp * 2225ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2226ac27a0ecSDave Kleikamp */ 2227ac27a0ecSDave Kleikamp int 2228617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 2229ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 2230ac27a0ecSDave Kleikamp int flags) 2231ac27a0ecSDave Kleikamp { 2232617ba13bSMingming Cao struct ext4_xattr_info i = { 2233ac27a0ecSDave Kleikamp .name_index = name_index, 2234ac27a0ecSDave Kleikamp .name = name, 2235ac27a0ecSDave Kleikamp .value = value, 2236ac27a0ecSDave Kleikamp .value_len = value_len, 2237e50e5129SAndreas Dilger .in_inode = 0, 2238ac27a0ecSDave Kleikamp }; 2239617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 2240ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2241ac27a0ecSDave Kleikamp }; 2242617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 2243ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2244ac27a0ecSDave Kleikamp }; 2245c755e251STheodore Ts'o int no_expand; 2246ac27a0ecSDave Kleikamp int error; 2247ac27a0ecSDave Kleikamp 2248ac27a0ecSDave Kleikamp if (!name) 2249ac27a0ecSDave Kleikamp return -EINVAL; 2250ac27a0ecSDave Kleikamp if (strlen(name) > 255) 2251ac27a0ecSDave Kleikamp return -ERANGE; 2252b8cb5a54STahsin Erdogan 2253c755e251STheodore Ts'o ext4_write_lock_xattr(inode, &no_expand); 22544d20c685SKalpak Shah 2255c1a5d5f6STahsin Erdogan /* Check journal credits under write lock. */ 2256c1a5d5f6STahsin Erdogan if (ext4_handle_valid(handle)) { 2257dec214d0STahsin Erdogan struct buffer_head *bh; 2258c1a5d5f6STahsin Erdogan int credits; 2259c1a5d5f6STahsin Erdogan 2260dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2261dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2262dec214d0STahsin Erdogan error = PTR_ERR(bh); 2263dec214d0STahsin Erdogan goto cleanup; 2264dec214d0STahsin Erdogan } 2265dec214d0STahsin Erdogan 2266dec214d0STahsin Erdogan credits = __ext4_xattr_set_credits(inode, bh, value_len); 2267dec214d0STahsin Erdogan brelse(bh); 2268dec214d0STahsin Erdogan 2269c1a5d5f6STahsin Erdogan if (!ext4_handle_has_enough_credits(handle, credits)) { 2270c1a5d5f6STahsin Erdogan error = -ENOSPC; 2271c1a5d5f6STahsin Erdogan goto cleanup; 2272c1a5d5f6STahsin Erdogan } 2273c1a5d5f6STahsin Erdogan } 2274c1a5d5f6STahsin Erdogan 227566543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 227686ebfd08SEric Sandeen if (error) 227786ebfd08SEric Sandeen goto cleanup; 227886ebfd08SEric Sandeen 227919f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 2280617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 2281617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 228219f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 2283ac27a0ecSDave Kleikamp } 2284ac27a0ecSDave Kleikamp 2285617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 2286ac27a0ecSDave Kleikamp if (error) 2287ac27a0ecSDave Kleikamp goto cleanup; 2288ac27a0ecSDave Kleikamp if (is.s.not_found) 2289617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 2290ac27a0ecSDave Kleikamp if (error) 2291ac27a0ecSDave Kleikamp goto cleanup; 2292ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 2293ac27a0ecSDave Kleikamp error = -ENODATA; 2294ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 2295ac27a0ecSDave Kleikamp goto cleanup; 2296ac27a0ecSDave Kleikamp error = 0; 2297ac27a0ecSDave Kleikamp if (!value) 2298ac27a0ecSDave Kleikamp goto cleanup; 2299ac27a0ecSDave Kleikamp } else { 2300ac27a0ecSDave Kleikamp error = -EEXIST; 2301ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 2302ac27a0ecSDave Kleikamp goto cleanup; 2303ac27a0ecSDave Kleikamp } 2304dec214d0STahsin Erdogan 2305ac27a0ecSDave Kleikamp if (!value) { 2306ac27a0ecSDave Kleikamp if (!is.s.not_found) 2307e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2308ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 2309617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2310ac27a0ecSDave Kleikamp } else { 23113fd16462SJan Kara error = 0; 23123fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 23133fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 23143fd16462SJan Kara goto cleanup; 23153fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 23163fd16462SJan Kara goto cleanup; 23173fd16462SJan Kara 2318b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2319b347e2bcSTahsin Erdogan (EXT4_XATTR_SIZE(i.value_len) > 2320b347e2bcSTahsin Erdogan EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) 2321b347e2bcSTahsin Erdogan i.in_inode = 1; 2322b347e2bcSTahsin Erdogan retry_inode: 2323e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2324ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 2325ac27a0ecSDave Kleikamp i.value = NULL; 2326617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2327ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 23287e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 23297e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 23307e01c8e5STiger Yang if (error) 23317e01c8e5STiger Yang goto cleanup; 23327e01c8e5STiger Yang } 2333617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2334b347e2bcSTahsin Erdogan if (!error && !is.s.not_found) { 2335ac27a0ecSDave Kleikamp i.value = NULL; 2336e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, 2337e50e5129SAndreas Dilger &is); 2338b347e2bcSTahsin Erdogan } else if (error == -ENOSPC) { 2339b347e2bcSTahsin Erdogan /* 2340b347e2bcSTahsin Erdogan * Xattr does not fit in the block, store at 2341b347e2bcSTahsin Erdogan * external inode if possible. 2342b347e2bcSTahsin Erdogan */ 2343b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2344b347e2bcSTahsin Erdogan !i.in_inode) { 2345b347e2bcSTahsin Erdogan i.in_inode = 1; 2346b347e2bcSTahsin Erdogan goto retry_inode; 2347b347e2bcSTahsin Erdogan } 2348ac27a0ecSDave Kleikamp } 2349ac27a0ecSDave Kleikamp } 2350ac27a0ecSDave Kleikamp } 2351ac27a0ecSDave Kleikamp if (!error) { 2352617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 2353eeca7ea1SDeepa Dinamani inode->i_ctime = current_time(inode); 23546dd4ee7cSKalpak Shah if (!value) 2355c755e251STheodore Ts'o no_expand = 0; 2356617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 2357ac27a0ecSDave Kleikamp /* 2358617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 2359ac27a0ecSDave Kleikamp * error != 0. 2360ac27a0ecSDave Kleikamp */ 2361ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 2362ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 23630390131bSFrank Mayhar ext4_handle_sync(handle); 2364ac27a0ecSDave Kleikamp } 2365ac27a0ecSDave Kleikamp 2366ac27a0ecSDave Kleikamp cleanup: 2367ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 2368ac27a0ecSDave Kleikamp brelse(bs.bh); 2369c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 2370ac27a0ecSDave Kleikamp return error; 2371ac27a0ecSDave Kleikamp } 2372ac27a0ecSDave Kleikamp 2373dec214d0STahsin Erdogan int ext4_xattr_set_credits(struct inode *inode, size_t value_len, int *credits) 2374c1a5d5f6STahsin Erdogan { 2375dec214d0STahsin Erdogan struct buffer_head *bh; 2376dec214d0STahsin Erdogan int err; 2377c1a5d5f6STahsin Erdogan 2378dec214d0STahsin Erdogan *credits = 0; 2379dec214d0STahsin Erdogan 2380dec214d0STahsin Erdogan if (!EXT4_SB(inode->i_sb)->s_journal) 2381c1a5d5f6STahsin Erdogan return 0; 2382c1a5d5f6STahsin Erdogan 2383dec214d0STahsin Erdogan down_read(&EXT4_I(inode)->xattr_sem); 2384c1a5d5f6STahsin Erdogan 2385dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2386dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2387dec214d0STahsin Erdogan err = PTR_ERR(bh); 2388dec214d0STahsin Erdogan } else { 2389dec214d0STahsin Erdogan *credits = __ext4_xattr_set_credits(inode, bh, value_len); 2390dec214d0STahsin Erdogan brelse(bh); 2391dec214d0STahsin Erdogan err = 0; 2392c1a5d5f6STahsin Erdogan } 2393dec214d0STahsin Erdogan 2394dec214d0STahsin Erdogan up_read(&EXT4_I(inode)->xattr_sem); 2395dec214d0STahsin Erdogan return err; 2396c1a5d5f6STahsin Erdogan } 2397c1a5d5f6STahsin Erdogan 2398ac27a0ecSDave Kleikamp /* 2399617ba13bSMingming Cao * ext4_xattr_set() 2400ac27a0ecSDave Kleikamp * 2401617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 2402ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 2403ac27a0ecSDave Kleikamp * 2404ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2405ac27a0ecSDave Kleikamp */ 2406ac27a0ecSDave Kleikamp int 2407617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 2408ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 2409ac27a0ecSDave Kleikamp { 2410ac27a0ecSDave Kleikamp handle_t *handle; 2411e50e5129SAndreas Dilger struct super_block *sb = inode->i_sb; 2412ac27a0ecSDave Kleikamp int error, retries = 0; 2413c1a5d5f6STahsin Erdogan int credits; 2414ac27a0ecSDave Kleikamp 2415b8cb5a54STahsin Erdogan error = dquot_initialize(inode); 2416b8cb5a54STahsin Erdogan if (error) 2417b8cb5a54STahsin Erdogan return error; 2418e50e5129SAndreas Dilger 2419ac27a0ecSDave Kleikamp retry: 2420dec214d0STahsin Erdogan error = ext4_xattr_set_credits(inode, value_len, &credits); 2421dec214d0STahsin Erdogan if (error) 2422dec214d0STahsin Erdogan return error; 2423dec214d0STahsin Erdogan 24249924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 2425ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 2426ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 2427ac27a0ecSDave Kleikamp } else { 2428ac27a0ecSDave Kleikamp int error2; 2429ac27a0ecSDave Kleikamp 2430617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 2431ac27a0ecSDave Kleikamp value, value_len, flags); 2432617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 2433ac27a0ecSDave Kleikamp if (error == -ENOSPC && 2434e50e5129SAndreas Dilger ext4_should_retry_alloc(sb, &retries)) 2435ac27a0ecSDave Kleikamp goto retry; 2436ac27a0ecSDave Kleikamp if (error == 0) 2437ac27a0ecSDave Kleikamp error = error2; 2438ac27a0ecSDave Kleikamp } 2439ac27a0ecSDave Kleikamp 2440ac27a0ecSDave Kleikamp return error; 2441ac27a0ecSDave Kleikamp } 2442ac27a0ecSDave Kleikamp 2443ac27a0ecSDave Kleikamp /* 24446dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 24456dd4ee7cSKalpak Shah * i_extra_isize. 24466dd4ee7cSKalpak Shah */ 24476dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 24486dd4ee7cSKalpak Shah int value_offs_shift, void *to, 244994405713SJan Kara void *from, size_t n) 24506dd4ee7cSKalpak Shah { 24516dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 24526dd4ee7cSKalpak Shah int new_offs; 24536dd4ee7cSKalpak Shah 245494405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 245594405713SJan Kara BUG_ON(value_offs_shift > 0); 245694405713SJan Kara 24576dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 24586dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 2459e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 24606dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 24616dd4ee7cSKalpak Shah value_offs_shift; 24626dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 24636dd4ee7cSKalpak Shah } 24646dd4ee7cSKalpak Shah } 24656dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 24666dd4ee7cSKalpak Shah memmove(to, from, n); 24676dd4ee7cSKalpak Shah } 24686dd4ee7cSKalpak Shah 24696dd4ee7cSKalpak Shah /* 24703f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 24713f2571c1SJan Kara */ 24723f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 24733f2571c1SJan Kara struct ext4_inode *raw_inode, 24743f2571c1SJan Kara struct ext4_xattr_entry *entry) 24753f2571c1SJan Kara { 24763f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 24773f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 24783f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 2479f6109100STahsin Erdogan size_t value_size = le32_to_cpu(entry->e_value_size); 24803f2571c1SJan Kara struct ext4_xattr_info i = { 24813f2571c1SJan Kara .value = NULL, 24823f2571c1SJan Kara .value_len = 0, 24833f2571c1SJan Kara .name_index = entry->e_name_index, 2484f6109100STahsin Erdogan .in_inode = !!entry->e_value_inum, 24853f2571c1SJan Kara }; 24863f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 24873f2571c1SJan Kara int error; 24883f2571c1SJan Kara 24893f2571c1SJan Kara is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 24903f2571c1SJan Kara bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 24913f2571c1SJan Kara buffer = kmalloc(value_size, GFP_NOFS); 24923f2571c1SJan Kara b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 24933f2571c1SJan Kara if (!is || !bs || !buffer || !b_entry_name) { 24943f2571c1SJan Kara error = -ENOMEM; 24953f2571c1SJan Kara goto out; 24963f2571c1SJan Kara } 24973f2571c1SJan Kara 24983f2571c1SJan Kara is->s.not_found = -ENODATA; 24993f2571c1SJan Kara bs->s.not_found = -ENODATA; 25003f2571c1SJan Kara is->iloc.bh = NULL; 25013f2571c1SJan Kara bs->bh = NULL; 25023f2571c1SJan Kara 25033f2571c1SJan Kara /* Save the entry name and the entry value */ 2504f6109100STahsin Erdogan if (entry->e_value_inum) { 2505b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, value_size); 2506f6109100STahsin Erdogan if (error) 2507f6109100STahsin Erdogan goto out; 2508f6109100STahsin Erdogan } else { 2509f6109100STahsin Erdogan size_t value_offs = le16_to_cpu(entry->e_value_offs); 25103f2571c1SJan Kara memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); 2511f6109100STahsin Erdogan } 2512f6109100STahsin Erdogan 25133f2571c1SJan Kara memcpy(b_entry_name, entry->e_name, entry->e_name_len); 25143f2571c1SJan Kara b_entry_name[entry->e_name_len] = '\0'; 25153f2571c1SJan Kara i.name = b_entry_name; 25163f2571c1SJan Kara 25173f2571c1SJan Kara error = ext4_get_inode_loc(inode, &is->iloc); 25183f2571c1SJan Kara if (error) 25193f2571c1SJan Kara goto out; 25203f2571c1SJan Kara 25213f2571c1SJan Kara error = ext4_xattr_ibody_find(inode, &i, is); 25223f2571c1SJan Kara if (error) 25233f2571c1SJan Kara goto out; 25243f2571c1SJan Kara 25253f2571c1SJan Kara /* Remove the chosen entry from the inode */ 2526e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, is); 25273f2571c1SJan Kara if (error) 25283f2571c1SJan Kara goto out; 25293f2571c1SJan Kara 25303f2571c1SJan Kara i.value = buffer; 25313f2571c1SJan Kara i.value_len = value_size; 25323f2571c1SJan Kara error = ext4_xattr_block_find(inode, &i, bs); 25333f2571c1SJan Kara if (error) 25343f2571c1SJan Kara goto out; 25353f2571c1SJan Kara 25363f2571c1SJan Kara /* Add entry which was removed from the inode into the block */ 25373f2571c1SJan Kara error = ext4_xattr_block_set(handle, inode, &i, bs); 25383f2571c1SJan Kara if (error) 25393f2571c1SJan Kara goto out; 25403f2571c1SJan Kara error = 0; 25413f2571c1SJan Kara out: 25423f2571c1SJan Kara kfree(b_entry_name); 25433f2571c1SJan Kara kfree(buffer); 25443f2571c1SJan Kara if (is) 25453f2571c1SJan Kara brelse(is->iloc.bh); 25463f2571c1SJan Kara kfree(is); 25473f2571c1SJan Kara kfree(bs); 25483f2571c1SJan Kara 25493f2571c1SJan Kara return error; 25503f2571c1SJan Kara } 25513f2571c1SJan Kara 2552dfa2064bSJan Kara static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, 2553dfa2064bSJan Kara struct ext4_inode *raw_inode, 2554dfa2064bSJan Kara int isize_diff, size_t ifree, 2555dfa2064bSJan Kara size_t bfree, int *total_ino) 2556dfa2064bSJan Kara { 2557dfa2064bSJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 2558dfa2064bSJan Kara struct ext4_xattr_entry *small_entry; 2559dfa2064bSJan Kara struct ext4_xattr_entry *entry; 2560dfa2064bSJan Kara struct ext4_xattr_entry *last; 2561dfa2064bSJan Kara unsigned int entry_size; /* EA entry size */ 2562dfa2064bSJan Kara unsigned int total_size; /* EA entry size + value size */ 2563dfa2064bSJan Kara unsigned int min_total_size; 2564dfa2064bSJan Kara int error; 2565dfa2064bSJan Kara 2566dfa2064bSJan Kara while (isize_diff > ifree) { 2567dfa2064bSJan Kara entry = NULL; 2568dfa2064bSJan Kara small_entry = NULL; 2569dfa2064bSJan Kara min_total_size = ~0U; 2570dfa2064bSJan Kara last = IFIRST(header); 2571dfa2064bSJan Kara /* Find the entry best suited to be pushed into EA block */ 2572dfa2064bSJan Kara for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 25739bb21cedSTahsin Erdogan total_size = EXT4_XATTR_LEN(last->e_name_len); 25749bb21cedSTahsin Erdogan if (!last->e_value_inum) 25759bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 25769bb21cedSTahsin Erdogan le32_to_cpu(last->e_value_size)); 2577dfa2064bSJan Kara if (total_size <= bfree && 2578dfa2064bSJan Kara total_size < min_total_size) { 2579dfa2064bSJan Kara if (total_size + ifree < isize_diff) { 2580dfa2064bSJan Kara small_entry = last; 2581dfa2064bSJan Kara } else { 2582dfa2064bSJan Kara entry = last; 2583dfa2064bSJan Kara min_total_size = total_size; 2584dfa2064bSJan Kara } 2585dfa2064bSJan Kara } 2586dfa2064bSJan Kara } 2587dfa2064bSJan Kara 2588dfa2064bSJan Kara if (entry == NULL) { 2589dfa2064bSJan Kara if (small_entry == NULL) 2590dfa2064bSJan Kara return -ENOSPC; 2591dfa2064bSJan Kara entry = small_entry; 2592dfa2064bSJan Kara } 2593dfa2064bSJan Kara 2594dfa2064bSJan Kara entry_size = EXT4_XATTR_LEN(entry->e_name_len); 25959bb21cedSTahsin Erdogan total_size = entry_size; 25969bb21cedSTahsin Erdogan if (!entry->e_value_inum) 25979bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 25989bb21cedSTahsin Erdogan le32_to_cpu(entry->e_value_size)); 2599dfa2064bSJan Kara error = ext4_xattr_move_to_block(handle, inode, raw_inode, 2600dfa2064bSJan Kara entry); 2601dfa2064bSJan Kara if (error) 2602dfa2064bSJan Kara return error; 2603dfa2064bSJan Kara 2604dfa2064bSJan Kara *total_ino -= entry_size; 2605dfa2064bSJan Kara ifree += total_size; 2606dfa2064bSJan Kara bfree -= total_size; 2607dfa2064bSJan Kara } 2608dfa2064bSJan Kara 2609dfa2064bSJan Kara return 0; 2610dfa2064bSJan Kara } 2611dfa2064bSJan Kara 26123f2571c1SJan Kara /* 26136dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 26146dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 26156dd4ee7cSKalpak Shah */ 26166dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 26176dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 26186dd4ee7cSKalpak Shah { 26196dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 26206dd4ee7cSKalpak Shah struct buffer_head *bh = NULL; 2621e3014d14SJan Kara size_t min_offs; 2622e3014d14SJan Kara size_t ifree, bfree; 26237b1b2c1bSTheodore Ts'o int total_ino; 26246e0cd088SJan Kara void *base, *end; 2625d0141191SJan Kara int error = 0, tried_min_extra_isize = 0; 2626ac39849dSAneesh Kumar K.V int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); 2627d0141191SJan Kara int isize_diff; /* How much do we need to grow i_extra_isize */ 2628c755e251STheodore Ts'o int no_expand; 26296dd4ee7cSKalpak Shah 2630c755e251STheodore Ts'o if (ext4_write_trylock_xattr(inode, &no_expand) == 0) 2631c755e251STheodore Ts'o return 0; 2632c755e251STheodore Ts'o 26336dd4ee7cSKalpak Shah retry: 2634d0141191SJan Kara isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; 26352e81a4eeSJan Kara if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) 26362e81a4eeSJan Kara goto out; 26376dd4ee7cSKalpak Shah 26386dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 26396dd4ee7cSKalpak Shah 26406dd4ee7cSKalpak Shah /* 26416dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 26426dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 26436dd4ee7cSKalpak Shah */ 26446dd4ee7cSKalpak Shah 26456e0cd088SJan Kara base = IFIRST(header); 26466dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 26476dd4ee7cSKalpak Shah min_offs = end - base; 26486dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 26496dd4ee7cSKalpak Shah 26509e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 26519e92f48cSTheodore Ts'o if (error) 26529e92f48cSTheodore Ts'o goto cleanup; 26539e92f48cSTheodore Ts'o 26546e0cd088SJan Kara ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); 2655e3014d14SJan Kara if (ifree >= isize_diff) 2656e3014d14SJan Kara goto shift; 26576dd4ee7cSKalpak Shah 26586dd4ee7cSKalpak Shah /* 26596dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 26606dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 26616dd4ee7cSKalpak Shah */ 26626dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 26636dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 26646dd4ee7cSKalpak Shah error = -EIO; 26656dd4ee7cSKalpak Shah if (!bh) 26666dd4ee7cSKalpak Shah goto cleanup; 2667cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 266824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 266924676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 26706a797d27SDarrick J. Wong error = -EFSCORRUPTED; 26716dd4ee7cSKalpak Shah goto cleanup; 26726dd4ee7cSKalpak Shah } 26736dd4ee7cSKalpak Shah base = BHDR(bh); 26746dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 26756dd4ee7cSKalpak Shah min_offs = end - base; 26766e0cd088SJan Kara bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, 26776e0cd088SJan Kara NULL); 2678e3014d14SJan Kara if (bfree + ifree < isize_diff) { 26796dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 26806dd4ee7cSKalpak Shah tried_min_extra_isize++; 26816dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 26826dd4ee7cSKalpak Shah brelse(bh); 26836dd4ee7cSKalpak Shah goto retry; 26846dd4ee7cSKalpak Shah } 2685dfa2064bSJan Kara error = -ENOSPC; 26866dd4ee7cSKalpak Shah goto cleanup; 26876dd4ee7cSKalpak Shah } 26886dd4ee7cSKalpak Shah } else { 2689e3014d14SJan Kara bfree = inode->i_sb->s_blocksize; 26906dd4ee7cSKalpak Shah } 26916dd4ee7cSKalpak Shah 2692dfa2064bSJan Kara error = ext4_xattr_make_inode_space(handle, inode, raw_inode, 2693dfa2064bSJan Kara isize_diff, ifree, bfree, 2694dfa2064bSJan Kara &total_ino); 2695dfa2064bSJan Kara if (error) { 2696dfa2064bSJan Kara if (error == -ENOSPC && !tried_min_extra_isize && 26976dd4ee7cSKalpak Shah s_min_extra_isize) { 26986dd4ee7cSKalpak Shah tried_min_extra_isize++; 26996dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 2700dcb9917bSTheodore Ts'o brelse(bh); 27016dd4ee7cSKalpak Shah goto retry; 27026dd4ee7cSKalpak Shah } 27036dd4ee7cSKalpak Shah goto cleanup; 27046dd4ee7cSKalpak Shah } 2705e3014d14SJan Kara shift: 2706e3014d14SJan Kara /* Adjust the offsets and shift the remaining entries ahead */ 27076e0cd088SJan Kara ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize 2708e3014d14SJan Kara - new_extra_isize, (void *)raw_inode + 2709e3014d14SJan Kara EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 271094405713SJan Kara (void *)header, total_ino); 2711e3014d14SJan Kara EXT4_I(inode)->i_extra_isize = new_extra_isize; 27126dd4ee7cSKalpak Shah brelse(bh); 27132e81a4eeSJan Kara out: 2714c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 27156dd4ee7cSKalpak Shah return 0; 27166dd4ee7cSKalpak Shah 27176dd4ee7cSKalpak Shah cleanup: 27186dd4ee7cSKalpak Shah brelse(bh); 27192e81a4eeSJan Kara /* 2720c755e251STheodore Ts'o * Inode size expansion failed; don't try again 27212e81a4eeSJan Kara */ 2722c755e251STheodore Ts'o no_expand = 1; 2723c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 27246dd4ee7cSKalpak Shah return error; 27256dd4ee7cSKalpak Shah } 27266dd4ee7cSKalpak Shah 2727e50e5129SAndreas Dilger #define EIA_INCR 16 /* must be 2^n */ 2728e50e5129SAndreas Dilger #define EIA_MASK (EIA_INCR - 1) 2729dec214d0STahsin Erdogan 2730dec214d0STahsin Erdogan /* Add the large xattr @inode into @ea_inode_array for deferred iput(). 27310421a189STahsin Erdogan * If @ea_inode_array is new or full it will be grown and the old 2732e50e5129SAndreas Dilger * contents copied over. 2733e50e5129SAndreas Dilger */ 2734e50e5129SAndreas Dilger static int 27350421a189STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 27360421a189STahsin Erdogan struct inode *inode) 2737e50e5129SAndreas Dilger { 27380421a189STahsin Erdogan if (*ea_inode_array == NULL) { 2739e50e5129SAndreas Dilger /* 2740e50e5129SAndreas Dilger * Start with 15 inodes, so it fits into a power-of-two size. 27410421a189STahsin Erdogan * If *ea_inode_array is NULL, this is essentially offsetof() 2742e50e5129SAndreas Dilger */ 27430421a189STahsin Erdogan (*ea_inode_array) = 27440421a189STahsin Erdogan kmalloc(offsetof(struct ext4_xattr_inode_array, 27450421a189STahsin Erdogan inodes[EIA_MASK]), 2746e50e5129SAndreas Dilger GFP_NOFS); 27470421a189STahsin Erdogan if (*ea_inode_array == NULL) 2748e50e5129SAndreas Dilger return -ENOMEM; 27490421a189STahsin Erdogan (*ea_inode_array)->count = 0; 27500421a189STahsin Erdogan } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { 2751e50e5129SAndreas Dilger /* expand the array once all 15 + n * 16 slots are full */ 27520421a189STahsin Erdogan struct ext4_xattr_inode_array *new_array = NULL; 27530421a189STahsin Erdogan int count = (*ea_inode_array)->count; 2754e50e5129SAndreas Dilger 2755e50e5129SAndreas Dilger /* if new_array is NULL, this is essentially offsetof() */ 2756e50e5129SAndreas Dilger new_array = kmalloc( 27570421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, 27580421a189STahsin Erdogan inodes[count + EIA_INCR]), 2759e50e5129SAndreas Dilger GFP_NOFS); 2760e50e5129SAndreas Dilger if (new_array == NULL) 2761e50e5129SAndreas Dilger return -ENOMEM; 27620421a189STahsin Erdogan memcpy(new_array, *ea_inode_array, 27630421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, inodes[count])); 27640421a189STahsin Erdogan kfree(*ea_inode_array); 27650421a189STahsin Erdogan *ea_inode_array = new_array; 2766e50e5129SAndreas Dilger } 27670421a189STahsin Erdogan (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; 2768e50e5129SAndreas Dilger return 0; 2769e50e5129SAndreas Dilger } 2770e50e5129SAndreas Dilger 27716dd4ee7cSKalpak Shah /* 2772617ba13bSMingming Cao * ext4_xattr_delete_inode() 2773ac27a0ecSDave Kleikamp * 2774e50e5129SAndreas Dilger * Free extended attribute resources associated with this inode. Traverse 2775dec214d0STahsin Erdogan * all entries and decrement reference on any xattr inodes associated with this 2776dec214d0STahsin Erdogan * inode. This is called immediately before an inode is freed. We have exclusive 2777dec214d0STahsin Erdogan * access to the inode. If an orphan inode is deleted it will also release its 2778dec214d0STahsin Erdogan * references on xattr block and xattr inodes. 2779ac27a0ecSDave Kleikamp */ 2780dec214d0STahsin Erdogan int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, 278130a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 278230a7eb97STahsin Erdogan int extra_credits) 2783ac27a0ecSDave Kleikamp { 2784ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 2785e50e5129SAndreas Dilger struct ext4_xattr_ibody_header *header; 278630a7eb97STahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 2787dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 278830a7eb97STahsin Erdogan int error; 278930a7eb97STahsin Erdogan 279030a7eb97STahsin Erdogan error = ext4_xattr_ensure_credits(handle, inode, extra_credits, 279130a7eb97STahsin Erdogan NULL /* bh */, 279230a7eb97STahsin Erdogan false /* dirty */, 279330a7eb97STahsin Erdogan false /* block_csum */); 279430a7eb97STahsin Erdogan if (error) { 279530a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); 279630a7eb97STahsin Erdogan goto cleanup; 279730a7eb97STahsin Erdogan } 2798ac27a0ecSDave Kleikamp 2799dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2800dec214d0STahsin Erdogan ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 2801e50e5129SAndreas Dilger 2802e50e5129SAndreas Dilger error = ext4_get_inode_loc(inode, &iloc); 2803dec214d0STahsin Erdogan if (error) { 2804dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); 2805e50e5129SAndreas Dilger goto cleanup; 2806e50e5129SAndreas Dilger } 2807dec214d0STahsin Erdogan 2808dec214d0STahsin Erdogan error = ext4_journal_get_write_access(handle, iloc.bh); 2809dec214d0STahsin Erdogan if (error) { 2810dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "write access (error %d)", 2811dec214d0STahsin Erdogan error); 2812dec214d0STahsin Erdogan goto cleanup; 2813dec214d0STahsin Erdogan } 2814dec214d0STahsin Erdogan 2815dec214d0STahsin Erdogan header = IHDR(inode, ext4_raw_inode(&iloc)); 2816dec214d0STahsin Erdogan if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) 2817dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, 2818dec214d0STahsin Erdogan IFIRST(header), 2819dec214d0STahsin Erdogan false /* block_csum */, 2820dec214d0STahsin Erdogan ea_inode_array, 2821dec214d0STahsin Erdogan extra_credits, 2822dec214d0STahsin Erdogan false /* skip_quota */); 2823dec214d0STahsin Erdogan } 2824dec214d0STahsin Erdogan 2825dec214d0STahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 2826617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 2827ac27a0ecSDave Kleikamp if (!bh) { 282824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 282924676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 283065d30005STahsin Erdogan error = -EIO; 2831ac27a0ecSDave Kleikamp goto cleanup; 2832ac27a0ecSDave Kleikamp } 2833dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2834dec214d0STahsin Erdogan if (error) { 2835dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "bad block %llu (error %d)", 2836dec214d0STahsin Erdogan EXT4_I(inode)->i_file_acl, error); 2837ac27a0ecSDave Kleikamp goto cleanup; 2838ac27a0ecSDave Kleikamp } 2839e50e5129SAndreas Dilger 284030a7eb97STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) { 2841dec214d0STahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 2842dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 2843dec214d0STahsin Erdogan if (entry->e_value_inum) 2844dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 2845dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 2846dec214d0STahsin Erdogan 2847e50e5129SAndreas Dilger } 2848e50e5129SAndreas Dilger 2849dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bh, ea_inode_array, 2850dec214d0STahsin Erdogan extra_credits); 2851dec214d0STahsin Erdogan /* 2852dec214d0STahsin Erdogan * Update i_file_acl value in the same transaction that releases 2853dec214d0STahsin Erdogan * block. 2854dec214d0STahsin Erdogan */ 2855617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 285630a7eb97STahsin Erdogan error = ext4_mark_inode_dirty(handle, inode); 285730a7eb97STahsin Erdogan if (error) { 285830a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", 285930a7eb97STahsin Erdogan error); 286030a7eb97STahsin Erdogan goto cleanup; 286130a7eb97STahsin Erdogan } 2862dec214d0STahsin Erdogan } 2863dec214d0STahsin Erdogan error = 0; 2864ac27a0ecSDave Kleikamp cleanup: 286530a7eb97STahsin Erdogan brelse(iloc.bh); 2866ac27a0ecSDave Kleikamp brelse(bh); 2867e50e5129SAndreas Dilger return error; 2868e50e5129SAndreas Dilger } 2869e50e5129SAndreas Dilger 28700421a189STahsin Erdogan void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) 2871e50e5129SAndreas Dilger { 2872dec214d0STahsin Erdogan int idx; 2873e50e5129SAndreas Dilger 28740421a189STahsin Erdogan if (ea_inode_array == NULL) 2875e50e5129SAndreas Dilger return; 2876e50e5129SAndreas Dilger 2877dec214d0STahsin Erdogan for (idx = 0; idx < ea_inode_array->count; ++idx) 2878dec214d0STahsin Erdogan iput(ea_inode_array->inodes[idx]); 28790421a189STahsin Erdogan kfree(ea_inode_array); 2880ac27a0ecSDave Kleikamp } 2881ac27a0ecSDave Kleikamp 2882ac27a0ecSDave Kleikamp /* 288347387409STahsin Erdogan * ext4_xattr_block_cache_insert() 2884ac27a0ecSDave Kleikamp * 288547387409STahsin Erdogan * Create a new entry in the extended attribute block cache, and insert 2886ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 2887ac27a0ecSDave Kleikamp * 2888ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2889ac27a0ecSDave Kleikamp */ 2890ac27a0ecSDave Kleikamp static void 289147387409STahsin Erdogan ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, 289247387409STahsin Erdogan struct buffer_head *bh) 2893ac27a0ecSDave Kleikamp { 28946048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 28956048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 28966048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 28976048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 2898ac27a0ecSDave Kleikamp int error; 2899ac27a0ecSDave Kleikamp 2900*cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 2901*cdb7ee4cSTahsin Erdogan return; 290247387409STahsin Erdogan error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, 29036048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 2904ac27a0ecSDave Kleikamp if (error) { 290582939d79SJan Kara if (error == -EBUSY) 2906ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 290782939d79SJan Kara } else 2908ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 2909ac27a0ecSDave Kleikamp } 2910ac27a0ecSDave Kleikamp 2911ac27a0ecSDave Kleikamp /* 2912617ba13bSMingming Cao * ext4_xattr_cmp() 2913ac27a0ecSDave Kleikamp * 2914ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 2915ac27a0ecSDave Kleikamp * 2916ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 2917ac27a0ecSDave Kleikamp * a negative error number on errors. 2918ac27a0ecSDave Kleikamp */ 2919ac27a0ecSDave Kleikamp static int 2920617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 2921617ba13bSMingming Cao struct ext4_xattr_header *header2) 2922ac27a0ecSDave Kleikamp { 2923617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 2924ac27a0ecSDave Kleikamp 2925ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 2926ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 2927ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 2928ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 2929ac27a0ecSDave Kleikamp return 1; 2930ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 2931ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 2932ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 2933ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 2934e50e5129SAndreas Dilger entry1->e_value_inum != entry2->e_value_inum || 2935ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 2936ac27a0ecSDave Kleikamp return 1; 29377cec1918STahsin Erdogan if (!entry1->e_value_inum && 29387cec1918STahsin Erdogan memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 2939ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 2940ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 2941ac27a0ecSDave Kleikamp return 1; 2942ac27a0ecSDave Kleikamp 2943617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 2944617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 2945ac27a0ecSDave Kleikamp } 2946ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 2947ac27a0ecSDave Kleikamp return 1; 2948ac27a0ecSDave Kleikamp return 0; 2949ac27a0ecSDave Kleikamp } 2950ac27a0ecSDave Kleikamp 2951ac27a0ecSDave Kleikamp /* 295247387409STahsin Erdogan * ext4_xattr_block_cache_find() 2953ac27a0ecSDave Kleikamp * 2954ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 2955ac27a0ecSDave Kleikamp * 2956ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 2957ac27a0ecSDave Kleikamp * not found or an error occurred. 2958ac27a0ecSDave Kleikamp */ 2959ac27a0ecSDave Kleikamp static struct buffer_head * 296047387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *inode, 296147387409STahsin Erdogan struct ext4_xattr_header *header, 29627a2508e1SJan Kara struct mb_cache_entry **pce) 2963ac27a0ecSDave Kleikamp { 2964ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 29657a2508e1SJan Kara struct mb_cache_entry *ce; 296647387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 2967ac27a0ecSDave Kleikamp 2968*cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 2969*cdb7ee4cSTahsin Erdogan return NULL; 2970ac27a0ecSDave Kleikamp if (!header->h_hash) 2971ac27a0ecSDave Kleikamp return NULL; /* never share */ 2972ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 297347387409STahsin Erdogan ce = mb_cache_entry_find_first(ea_block_cache, hash); 2974ac27a0ecSDave Kleikamp while (ce) { 2975ac27a0ecSDave Kleikamp struct buffer_head *bh; 2976ac27a0ecSDave Kleikamp 2977c07dfcb4STahsin Erdogan bh = sb_bread(inode->i_sb, ce->e_value); 2978ac27a0ecSDave Kleikamp if (!bh) { 297924676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 2980c07dfcb4STahsin Erdogan (unsigned long)ce->e_value); 2981617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 2982ac27a0ecSDave Kleikamp *pce = ce; 2983ac27a0ecSDave Kleikamp return bh; 2984ac27a0ecSDave Kleikamp } 2985ac27a0ecSDave Kleikamp brelse(bh); 298647387409STahsin Erdogan ce = mb_cache_entry_find_next(ea_block_cache, ce); 2987ac27a0ecSDave Kleikamp } 2988ac27a0ecSDave Kleikamp return NULL; 2989ac27a0ecSDave Kleikamp } 2990ac27a0ecSDave Kleikamp 2991ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 2992ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 2993ac27a0ecSDave Kleikamp 2994ac27a0ecSDave Kleikamp /* 2995617ba13bSMingming Cao * ext4_xattr_hash_entry() 2996ac27a0ecSDave Kleikamp * 2997ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 2998ac27a0ecSDave Kleikamp */ 2999b9fc761eSTahsin Erdogan static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, 3000b9fc761eSTahsin Erdogan size_t value_count) 3001ac27a0ecSDave Kleikamp { 3002ac27a0ecSDave Kleikamp __u32 hash = 0; 3003ac27a0ecSDave Kleikamp 3004b9fc761eSTahsin Erdogan while (name_len--) { 3005ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 3006ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 3007ac27a0ecSDave Kleikamp *name++; 3008ac27a0ecSDave Kleikamp } 3009b9fc761eSTahsin Erdogan while (value_count--) { 3010ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 3011ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 3012ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 3013ac27a0ecSDave Kleikamp } 3014b9fc761eSTahsin Erdogan return cpu_to_le32(hash); 3015ac27a0ecSDave Kleikamp } 3016ac27a0ecSDave Kleikamp 3017ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 3018ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 3019ac27a0ecSDave Kleikamp 3020ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 3021ac27a0ecSDave Kleikamp 3022ac27a0ecSDave Kleikamp /* 3023617ba13bSMingming Cao * ext4_xattr_rehash() 3024ac27a0ecSDave Kleikamp * 3025ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 3026ac27a0ecSDave Kleikamp */ 3027daf83281STahsin Erdogan static void ext4_xattr_rehash(struct ext4_xattr_header *header) 3028ac27a0ecSDave Kleikamp { 3029617ba13bSMingming Cao struct ext4_xattr_entry *here; 3030ac27a0ecSDave Kleikamp __u32 hash = 0; 3031ac27a0ecSDave Kleikamp 3032ac27a0ecSDave Kleikamp here = ENTRY(header+1); 3033ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 3034ac27a0ecSDave Kleikamp if (!here->e_hash) { 3035ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 3036ac27a0ecSDave Kleikamp hash = 0; 3037ac27a0ecSDave Kleikamp break; 3038ac27a0ecSDave Kleikamp } 3039ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 3040ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 3041ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 3042617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 3043ac27a0ecSDave Kleikamp } 3044ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 3045ac27a0ecSDave Kleikamp } 3046ac27a0ecSDave Kleikamp 3047ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 3048ac27a0ecSDave Kleikamp 30499c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 30509c191f70ST Makphaibulchoke 30517a2508e1SJan Kara struct mb_cache * 305282939d79SJan Kara ext4_xattr_create_cache(void) 3053ac27a0ecSDave Kleikamp { 30547a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 3055ac27a0ecSDave Kleikamp } 3056ac27a0ecSDave Kleikamp 30577a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 3058ac27a0ecSDave Kleikamp { 30599c191f70ST Makphaibulchoke if (cache) 30607a2508e1SJan Kara mb_cache_destroy(cache); 3061ac27a0ecSDave Kleikamp } 30629c191f70ST Makphaibulchoke 3063