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; 454191eac33SEmoly Liu err = 0; 455dec214d0STahsin Erdogan } else if (err) 456dec214d0STahsin Erdogan goto out; 457dec214d0STahsin Erdogan 458dec214d0STahsin Erdogan if (ea_inode_cache) 459dec214d0STahsin Erdogan mb_cache_entry_create(ea_inode_cache, GFP_NOFS, 460dec214d0STahsin Erdogan ext4_xattr_inode_get_hash(ea_inode), 461dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 462dec214d0STahsin Erdogan out: 463e50e5129SAndreas Dilger iput(ea_inode); 464dec214d0STahsin Erdogan return err; 465e50e5129SAndreas Dilger } 466e50e5129SAndreas Dilger 467ac27a0ecSDave Kleikamp static int 468617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 469ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 470ac27a0ecSDave Kleikamp { 471ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 472617ba13bSMingming Cao struct ext4_xattr_entry *entry; 473ac27a0ecSDave Kleikamp size_t size; 474ac27a0ecSDave Kleikamp int error; 47547387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 476ac27a0ecSDave Kleikamp 477ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 478ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 479ac27a0ecSDave Kleikamp 480ac27a0ecSDave Kleikamp error = -ENODATA; 481617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 482ac27a0ecSDave Kleikamp goto cleanup; 483ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 484ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 485617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 486ac27a0ecSDave Kleikamp if (!bh) 487ac27a0ecSDave Kleikamp goto cleanup; 488ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 489ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 490cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 49124676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 492617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 4936a797d27SDarrick J. Wong error = -EFSCORRUPTED; 494ac27a0ecSDave Kleikamp goto cleanup; 495ac27a0ecSDave Kleikamp } 49647387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bh); 497ac27a0ecSDave Kleikamp entry = BFIRST(bh); 4986ba644b9SEric Biggers error = ext4_xattr_find_entry(&entry, name_index, name, 1); 499ac27a0ecSDave Kleikamp if (error) 500ac27a0ecSDave Kleikamp goto cleanup; 501ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 502ac27a0ecSDave Kleikamp if (buffer) { 503ac27a0ecSDave Kleikamp error = -ERANGE; 504ac27a0ecSDave Kleikamp if (size > buffer_size) 505ac27a0ecSDave Kleikamp goto cleanup; 506e50e5129SAndreas Dilger if (entry->e_value_inum) { 507b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 508b9fc761eSTahsin Erdogan size); 509e50e5129SAndreas Dilger if (error) 510e50e5129SAndreas Dilger goto cleanup; 511e50e5129SAndreas Dilger } else { 512e50e5129SAndreas Dilger memcpy(buffer, bh->b_data + 513e50e5129SAndreas Dilger le16_to_cpu(entry->e_value_offs), size); 514e50e5129SAndreas Dilger } 515ac27a0ecSDave Kleikamp } 516ac27a0ecSDave Kleikamp error = size; 517ac27a0ecSDave Kleikamp 518ac27a0ecSDave Kleikamp cleanup: 519ac27a0ecSDave Kleikamp brelse(bh); 520ac27a0ecSDave Kleikamp return error; 521ac27a0ecSDave Kleikamp } 522ac27a0ecSDave Kleikamp 523879b3825STao Ma int 524617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 525ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 526ac27a0ecSDave Kleikamp { 527617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 528617ba13bSMingming Cao struct ext4_xattr_entry *entry; 529617ba13bSMingming Cao struct ext4_inode *raw_inode; 530617ba13bSMingming Cao struct ext4_iloc iloc; 531ac27a0ecSDave Kleikamp size_t size; 532ac27a0ecSDave Kleikamp void *end; 533ac27a0ecSDave Kleikamp int error; 534ac27a0ecSDave Kleikamp 53519f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 536ac27a0ecSDave Kleikamp return -ENODATA; 537617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 538ac27a0ecSDave Kleikamp if (error) 539ac27a0ecSDave Kleikamp return error; 540617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 541ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 542617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 5439e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 544ac27a0ecSDave Kleikamp if (error) 545ac27a0ecSDave Kleikamp goto cleanup; 5466ba644b9SEric Biggers entry = IFIRST(header); 5476ba644b9SEric Biggers error = ext4_xattr_find_entry(&entry, name_index, name, 0); 548ac27a0ecSDave Kleikamp if (error) 549ac27a0ecSDave Kleikamp goto cleanup; 550ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 551ac27a0ecSDave Kleikamp if (buffer) { 552ac27a0ecSDave Kleikamp error = -ERANGE; 553ac27a0ecSDave Kleikamp if (size > buffer_size) 554ac27a0ecSDave Kleikamp goto cleanup; 555e50e5129SAndreas Dilger if (entry->e_value_inum) { 556b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 557b9fc761eSTahsin Erdogan size); 558e50e5129SAndreas Dilger if (error) 559e50e5129SAndreas Dilger goto cleanup; 560e50e5129SAndreas Dilger } else { 561ac27a0ecSDave Kleikamp memcpy(buffer, (void *)IFIRST(header) + 562ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs), size); 563ac27a0ecSDave Kleikamp } 564e50e5129SAndreas Dilger } 565ac27a0ecSDave Kleikamp error = size; 566ac27a0ecSDave Kleikamp 567ac27a0ecSDave Kleikamp cleanup: 568ac27a0ecSDave Kleikamp brelse(iloc.bh); 569ac27a0ecSDave Kleikamp return error; 570ac27a0ecSDave Kleikamp } 571ac27a0ecSDave Kleikamp 572ac27a0ecSDave Kleikamp /* 573617ba13bSMingming Cao * ext4_xattr_get() 574ac27a0ecSDave Kleikamp * 575ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 576ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 577ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 578ac27a0ecSDave Kleikamp * 579ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 580ac27a0ecSDave Kleikamp * used / required on success. 581ac27a0ecSDave Kleikamp */ 582ac27a0ecSDave Kleikamp int 583617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 584ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 585ac27a0ecSDave Kleikamp { 586ac27a0ecSDave Kleikamp int error; 587ac27a0ecSDave Kleikamp 5880db1ff22STheodore Ts'o if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 5890db1ff22STheodore Ts'o return -EIO; 5900db1ff22STheodore Ts'o 591230b8c1aSZhang Zhen if (strlen(name) > 255) 592230b8c1aSZhang Zhen return -ERANGE; 593230b8c1aSZhang Zhen 594617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 595617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 596ac27a0ecSDave Kleikamp buffer_size); 597ac27a0ecSDave Kleikamp if (error == -ENODATA) 598617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 599ac27a0ecSDave Kleikamp buffer_size); 600617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 601ac27a0ecSDave Kleikamp return error; 602ac27a0ecSDave Kleikamp } 603ac27a0ecSDave Kleikamp 604ac27a0ecSDave Kleikamp static int 605431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 606ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 607ac27a0ecSDave Kleikamp { 608ac27a0ecSDave Kleikamp size_t rest = buffer_size; 609ac27a0ecSDave Kleikamp 610617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 61111e27528SStephen Hemminger const struct xattr_handler *handler = 612617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 613ac27a0ecSDave Kleikamp 614764a5c6bSAndreas Gruenbacher if (handler && (!handler->list || handler->list(dentry))) { 615764a5c6bSAndreas Gruenbacher const char *prefix = handler->prefix ?: handler->name; 616764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 617764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 618764a5c6bSAndreas Gruenbacher 619ac27a0ecSDave Kleikamp if (buffer) { 620ac27a0ecSDave Kleikamp if (size > rest) 621ac27a0ecSDave Kleikamp return -ERANGE; 622764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 623764a5c6bSAndreas Gruenbacher buffer += prefix_len; 624764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 625764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 626764a5c6bSAndreas Gruenbacher *buffer++ = 0; 627ac27a0ecSDave Kleikamp } 628ac27a0ecSDave Kleikamp rest -= size; 629ac27a0ecSDave Kleikamp } 630ac27a0ecSDave Kleikamp } 631764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 632ac27a0ecSDave Kleikamp } 633ac27a0ecSDave Kleikamp 634ac27a0ecSDave Kleikamp static int 635431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 636ac27a0ecSDave Kleikamp { 6372b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 638ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 639ac27a0ecSDave Kleikamp int error; 640ac27a0ecSDave Kleikamp 641ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 642ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 643ac27a0ecSDave Kleikamp 644ac27a0ecSDave Kleikamp error = 0; 645617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 646ac27a0ecSDave Kleikamp goto cleanup; 647ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 648ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 649617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 650ac27a0ecSDave Kleikamp error = -EIO; 651ac27a0ecSDave Kleikamp if (!bh) 652ac27a0ecSDave Kleikamp goto cleanup; 653ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 654ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 655cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 65624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 657617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 6586a797d27SDarrick J. Wong error = -EFSCORRUPTED; 659ac27a0ecSDave Kleikamp goto cleanup; 660ac27a0ecSDave Kleikamp } 66147387409STahsin Erdogan ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); 662431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); 663ac27a0ecSDave Kleikamp 664ac27a0ecSDave Kleikamp cleanup: 665ac27a0ecSDave Kleikamp brelse(bh); 666ac27a0ecSDave Kleikamp 667ac27a0ecSDave Kleikamp return error; 668ac27a0ecSDave Kleikamp } 669ac27a0ecSDave Kleikamp 670ac27a0ecSDave Kleikamp static int 671431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 672ac27a0ecSDave Kleikamp { 6732b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 674617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 675617ba13bSMingming Cao struct ext4_inode *raw_inode; 676617ba13bSMingming Cao struct ext4_iloc iloc; 677ac27a0ecSDave Kleikamp void *end; 678ac27a0ecSDave Kleikamp int error; 679ac27a0ecSDave Kleikamp 68019f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 681ac27a0ecSDave Kleikamp return 0; 682617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 683ac27a0ecSDave Kleikamp if (error) 684ac27a0ecSDave Kleikamp return error; 685617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 686ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 687617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 6889e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 689ac27a0ecSDave Kleikamp if (error) 690ac27a0ecSDave Kleikamp goto cleanup; 691431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 692ac27a0ecSDave Kleikamp buffer, buffer_size); 693ac27a0ecSDave Kleikamp 694ac27a0ecSDave Kleikamp cleanup: 695ac27a0ecSDave Kleikamp brelse(iloc.bh); 696ac27a0ecSDave Kleikamp return error; 697ac27a0ecSDave Kleikamp } 698ac27a0ecSDave Kleikamp 699ac27a0ecSDave Kleikamp /* 700ba7ea1d8SEric Biggers * Inode operation listxattr() 701ba7ea1d8SEric Biggers * 702ba7ea1d8SEric Biggers * d_inode(dentry)->i_rwsem: don't care 703ac27a0ecSDave Kleikamp * 704ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 705ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 706ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 707ac27a0ecSDave Kleikamp * 708ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 709ac27a0ecSDave Kleikamp * used / required on success. 710ac27a0ecSDave Kleikamp */ 711ba7ea1d8SEric Biggers ssize_t 712ba7ea1d8SEric Biggers ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) 713ac27a0ecSDave Kleikamp { 714eaeef867STheodore Ts'o int ret, ret2; 715ac27a0ecSDave Kleikamp 7162b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 717eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 718eaeef867STheodore Ts'o if (ret < 0) 719eaeef867STheodore Ts'o goto errout; 720ac27a0ecSDave Kleikamp if (buffer) { 721eaeef867STheodore Ts'o buffer += ret; 722eaeef867STheodore Ts'o buffer_size -= ret; 723ac27a0ecSDave Kleikamp } 724eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 725eaeef867STheodore Ts'o if (ret < 0) 726eaeef867STheodore Ts'o goto errout; 727eaeef867STheodore Ts'o ret += ret2; 728eaeef867STheodore Ts'o errout: 7292b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 730eaeef867STheodore Ts'o return ret; 731ac27a0ecSDave Kleikamp } 732ac27a0ecSDave Kleikamp 733ac27a0ecSDave Kleikamp /* 734617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 735ac27a0ecSDave Kleikamp * not set, set it. 736ac27a0ecSDave Kleikamp */ 737617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 738ac27a0ecSDave Kleikamp struct super_block *sb) 739ac27a0ecSDave Kleikamp { 740e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 741ac27a0ecSDave Kleikamp return; 742ac27a0ecSDave Kleikamp 7435d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 744617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 745e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 746a0375156STheodore Ts'o ext4_handle_dirty_super(handle, sb); 747ac27a0ecSDave Kleikamp } 748ac27a0ecSDave Kleikamp } 749ac27a0ecSDave Kleikamp 7507a9ca53aSTahsin Erdogan int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) 7517a9ca53aSTahsin Erdogan { 7527a9ca53aSTahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 7537a9ca53aSTahsin Erdogan struct buffer_head *bh = NULL; 7547a9ca53aSTahsin Erdogan struct ext4_inode *raw_inode; 7557a9ca53aSTahsin Erdogan struct ext4_xattr_ibody_header *header; 7567a9ca53aSTahsin Erdogan struct ext4_xattr_entry *entry; 7577a9ca53aSTahsin Erdogan qsize_t ea_inode_refs = 0; 7587a9ca53aSTahsin Erdogan void *end; 7597a9ca53aSTahsin Erdogan int ret; 7607a9ca53aSTahsin Erdogan 7617a9ca53aSTahsin Erdogan lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); 7627a9ca53aSTahsin Erdogan 7637a9ca53aSTahsin Erdogan if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 7647a9ca53aSTahsin Erdogan ret = ext4_get_inode_loc(inode, &iloc); 7657a9ca53aSTahsin Erdogan if (ret) 7667a9ca53aSTahsin Erdogan goto out; 7677a9ca53aSTahsin Erdogan raw_inode = ext4_raw_inode(&iloc); 7687a9ca53aSTahsin Erdogan header = IHDR(inode, raw_inode); 7697a9ca53aSTahsin Erdogan end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 7707a9ca53aSTahsin Erdogan ret = xattr_check_inode(inode, header, end); 7717a9ca53aSTahsin Erdogan if (ret) 7727a9ca53aSTahsin Erdogan goto out; 7737a9ca53aSTahsin Erdogan 7747a9ca53aSTahsin Erdogan for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); 7757a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 7767a9ca53aSTahsin Erdogan if (entry->e_value_inum) 7777a9ca53aSTahsin Erdogan ea_inode_refs++; 7787a9ca53aSTahsin Erdogan } 7797a9ca53aSTahsin Erdogan 7807a9ca53aSTahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 7817a9ca53aSTahsin Erdogan bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 7827a9ca53aSTahsin Erdogan if (!bh) { 7837a9ca53aSTahsin Erdogan ret = -EIO; 7847a9ca53aSTahsin Erdogan goto out; 7857a9ca53aSTahsin Erdogan } 7867a9ca53aSTahsin Erdogan 7877a9ca53aSTahsin Erdogan if (ext4_xattr_check_block(inode, bh)) { 7887a9ca53aSTahsin Erdogan ret = -EFSCORRUPTED; 7897a9ca53aSTahsin Erdogan goto out; 7907a9ca53aSTahsin Erdogan } 7917a9ca53aSTahsin Erdogan 7927a9ca53aSTahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 7937a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 7947a9ca53aSTahsin Erdogan if (entry->e_value_inum) 7957a9ca53aSTahsin Erdogan ea_inode_refs++; 7967a9ca53aSTahsin Erdogan } 7977a9ca53aSTahsin Erdogan *usage = ea_inode_refs + 1; 7987a9ca53aSTahsin Erdogan ret = 0; 7997a9ca53aSTahsin Erdogan out: 8007a9ca53aSTahsin Erdogan brelse(iloc.bh); 8017a9ca53aSTahsin Erdogan brelse(bh); 8027a9ca53aSTahsin Erdogan return ret; 8037a9ca53aSTahsin Erdogan } 8047a9ca53aSTahsin Erdogan 805dec214d0STahsin Erdogan static inline size_t round_up_cluster(struct inode *inode, size_t length) 806dec214d0STahsin Erdogan { 807dec214d0STahsin Erdogan struct super_block *sb = inode->i_sb; 808dec214d0STahsin Erdogan size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + 809dec214d0STahsin Erdogan inode->i_blkbits); 810dec214d0STahsin Erdogan size_t mask = ~(cluster_size - 1); 811dec214d0STahsin Erdogan 812dec214d0STahsin Erdogan return (length + cluster_size - 1) & mask; 813dec214d0STahsin Erdogan } 814dec214d0STahsin Erdogan 815dec214d0STahsin Erdogan static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) 816dec214d0STahsin Erdogan { 817dec214d0STahsin Erdogan int err; 818dec214d0STahsin Erdogan 819dec214d0STahsin Erdogan err = dquot_alloc_inode(inode); 820dec214d0STahsin Erdogan if (err) 821dec214d0STahsin Erdogan return err; 822dec214d0STahsin Erdogan err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); 823dec214d0STahsin Erdogan if (err) 824dec214d0STahsin Erdogan dquot_free_inode(inode); 825dec214d0STahsin Erdogan return err; 826dec214d0STahsin Erdogan } 827dec214d0STahsin Erdogan 828dec214d0STahsin Erdogan static void ext4_xattr_inode_free_quota(struct inode *inode, size_t len) 829dec214d0STahsin Erdogan { 830dec214d0STahsin Erdogan dquot_free_space_nodirty(inode, round_up_cluster(inode, len)); 831dec214d0STahsin Erdogan dquot_free_inode(inode); 832dec214d0STahsin Erdogan } 833dec214d0STahsin Erdogan 834af65207cSTahsin Erdogan int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode, 835af65207cSTahsin Erdogan struct buffer_head *block_bh, size_t value_len, 836af65207cSTahsin Erdogan bool is_create) 837dec214d0STahsin Erdogan { 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 */ 863af65207cSTahsin Erdogan if (inode && 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 885af65207cSTahsin Erdogan if (!is_create) { 886dec214d0STahsin Erdogan /* Dereference ea_inode holding old xattr value. 887dec214d0STahsin Erdogan * Old ea_inode, inode map, block bitmap, group descriptor. 888dec214d0STahsin Erdogan */ 889dec214d0STahsin Erdogan credits += 4; 890dec214d0STahsin Erdogan 891dec214d0STahsin Erdogan /* Data blocks for old ea_inode. */ 892dec214d0STahsin Erdogan blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; 893dec214d0STahsin Erdogan 894af65207cSTahsin Erdogan /* Indirection block or one level of extent tree for old 895af65207cSTahsin Erdogan * ea_inode. 896af65207cSTahsin Erdogan */ 897dec214d0STahsin Erdogan blocks += 1; 898dec214d0STahsin Erdogan 899dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 900dec214d0STahsin Erdogan credits += blocks * 2; 901af65207cSTahsin Erdogan } 902dec214d0STahsin Erdogan 903dec214d0STahsin Erdogan /* We may need to clone the existing xattr block in which case we need 904dec214d0STahsin Erdogan * to increment ref counts for existing ea_inodes referenced by it. 905dec214d0STahsin Erdogan */ 906dec214d0STahsin Erdogan if (block_bh) { 907dec214d0STahsin Erdogan struct ext4_xattr_entry *entry = BFIRST(block_bh); 908dec214d0STahsin Erdogan 909dec214d0STahsin Erdogan for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) 910dec214d0STahsin Erdogan if (entry->e_value_inum) 911dec214d0STahsin Erdogan /* Ref count update on ea_inode. */ 912dec214d0STahsin Erdogan credits += 1; 913dec214d0STahsin Erdogan } 914dec214d0STahsin Erdogan return credits; 915dec214d0STahsin Erdogan } 916dec214d0STahsin Erdogan 91730a7eb97STahsin Erdogan static int ext4_xattr_ensure_credits(handle_t *handle, struct inode *inode, 91830a7eb97STahsin Erdogan int credits, struct buffer_head *bh, 91930a7eb97STahsin Erdogan bool dirty, bool block_csum) 92030a7eb97STahsin Erdogan { 92130a7eb97STahsin Erdogan int error; 92230a7eb97STahsin Erdogan 92330a7eb97STahsin Erdogan if (!ext4_handle_valid(handle)) 92430a7eb97STahsin Erdogan return 0; 92530a7eb97STahsin Erdogan 92630a7eb97STahsin Erdogan if (handle->h_buffer_credits >= credits) 92730a7eb97STahsin Erdogan return 0; 92830a7eb97STahsin Erdogan 92930a7eb97STahsin Erdogan error = ext4_journal_extend(handle, credits - handle->h_buffer_credits); 93030a7eb97STahsin Erdogan if (!error) 93130a7eb97STahsin Erdogan return 0; 93230a7eb97STahsin Erdogan if (error < 0) { 93330a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Extend journal (error %d)", error); 93430a7eb97STahsin Erdogan return error; 93530a7eb97STahsin Erdogan } 93630a7eb97STahsin Erdogan 93730a7eb97STahsin Erdogan if (bh && dirty) { 93830a7eb97STahsin Erdogan if (block_csum) 93930a7eb97STahsin Erdogan ext4_xattr_block_csum_set(inode, bh); 94030a7eb97STahsin Erdogan error = ext4_handle_dirty_metadata(handle, NULL, bh); 94130a7eb97STahsin Erdogan if (error) { 94230a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Handle metadata (error %d)", 94330a7eb97STahsin Erdogan error); 94430a7eb97STahsin Erdogan return error; 94530a7eb97STahsin Erdogan } 94630a7eb97STahsin Erdogan } 94730a7eb97STahsin Erdogan 94830a7eb97STahsin Erdogan error = ext4_journal_restart(handle, credits); 94930a7eb97STahsin Erdogan if (error) { 95030a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Restart journal (error %d)", error); 95130a7eb97STahsin Erdogan return error; 95230a7eb97STahsin Erdogan } 95330a7eb97STahsin Erdogan 95430a7eb97STahsin Erdogan if (bh) { 95530a7eb97STahsin Erdogan error = ext4_journal_get_write_access(handle, bh); 95630a7eb97STahsin Erdogan if (error) { 95730a7eb97STahsin Erdogan ext4_warning(inode->i_sb, 95830a7eb97STahsin Erdogan "Get write access failed (error %d)", 95930a7eb97STahsin Erdogan error); 96030a7eb97STahsin Erdogan return error; 96130a7eb97STahsin Erdogan } 96230a7eb97STahsin Erdogan } 96330a7eb97STahsin Erdogan return 0; 96430a7eb97STahsin Erdogan } 96530a7eb97STahsin Erdogan 966dec214d0STahsin Erdogan static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, 967dec214d0STahsin Erdogan int ref_change) 968dec214d0STahsin Erdogan { 969dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(ea_inode); 970dec214d0STahsin Erdogan struct ext4_iloc iloc; 971dec214d0STahsin Erdogan s64 ref_count; 972dec214d0STahsin Erdogan u32 hash; 973dec214d0STahsin Erdogan int ret; 974dec214d0STahsin Erdogan 975dec214d0STahsin Erdogan inode_lock(ea_inode); 976dec214d0STahsin Erdogan 977dec214d0STahsin Erdogan ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); 978dec214d0STahsin Erdogan if (ret) { 979dec214d0STahsin Erdogan iloc.bh = NULL; 980dec214d0STahsin Erdogan goto out; 981dec214d0STahsin Erdogan } 982dec214d0STahsin Erdogan 983dec214d0STahsin Erdogan ref_count = ext4_xattr_inode_get_ref(ea_inode); 984dec214d0STahsin Erdogan ref_count += ref_change; 985dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, ref_count); 986dec214d0STahsin Erdogan 987dec214d0STahsin Erdogan if (ref_change > 0) { 988dec214d0STahsin Erdogan WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", 989dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 990dec214d0STahsin Erdogan 991dec214d0STahsin Erdogan if (ref_count == 1) { 992dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", 993dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 994dec214d0STahsin Erdogan 995dec214d0STahsin Erdogan set_nlink(ea_inode, 1); 996dec214d0STahsin Erdogan ext4_orphan_del(handle, ea_inode); 997dec214d0STahsin Erdogan 998cdb7ee4cSTahsin Erdogan if (ea_inode_cache) { 999dec214d0STahsin Erdogan hash = ext4_xattr_inode_get_hash(ea_inode); 1000cdb7ee4cSTahsin Erdogan mb_cache_entry_create(ea_inode_cache, 1001cdb7ee4cSTahsin Erdogan GFP_NOFS, hash, 1002dec214d0STahsin Erdogan ea_inode->i_ino, 1003dec214d0STahsin Erdogan true /* reusable */); 1004dec214d0STahsin Erdogan } 1005cdb7ee4cSTahsin Erdogan } 1006dec214d0STahsin Erdogan } else { 1007dec214d0STahsin Erdogan WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", 1008dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1009dec214d0STahsin Erdogan 1010dec214d0STahsin Erdogan if (ref_count == 0) { 1011dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink != 1, 1012dec214d0STahsin Erdogan "EA inode %lu i_nlink=%u", 1013dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1014dec214d0STahsin Erdogan 1015dec214d0STahsin Erdogan clear_nlink(ea_inode); 1016dec214d0STahsin Erdogan ext4_orphan_add(handle, ea_inode); 1017dec214d0STahsin Erdogan 1018cdb7ee4cSTahsin Erdogan if (ea_inode_cache) { 1019dec214d0STahsin Erdogan hash = ext4_xattr_inode_get_hash(ea_inode); 1020dec214d0STahsin Erdogan mb_cache_entry_delete(ea_inode_cache, hash, 1021dec214d0STahsin Erdogan ea_inode->i_ino); 1022dec214d0STahsin Erdogan } 1023dec214d0STahsin Erdogan } 1024cdb7ee4cSTahsin Erdogan } 1025dec214d0STahsin Erdogan 1026dec214d0STahsin Erdogan ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); 1027dec214d0STahsin Erdogan iloc.bh = NULL; 1028dec214d0STahsin Erdogan if (ret) 1029dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 1030dec214d0STahsin Erdogan "ext4_mark_iloc_dirty() failed ret=%d", ret); 1031dec214d0STahsin Erdogan out: 1032dec214d0STahsin Erdogan brelse(iloc.bh); 1033dec214d0STahsin Erdogan inode_unlock(ea_inode); 1034dec214d0STahsin Erdogan return ret; 1035dec214d0STahsin Erdogan } 1036dec214d0STahsin Erdogan 1037dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) 1038dec214d0STahsin Erdogan { 1039dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, 1); 1040dec214d0STahsin Erdogan } 1041dec214d0STahsin Erdogan 1042dec214d0STahsin Erdogan static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) 1043dec214d0STahsin Erdogan { 1044dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, -1); 1045dec214d0STahsin Erdogan } 1046dec214d0STahsin Erdogan 1047dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, 1048dec214d0STahsin Erdogan struct ext4_xattr_entry *first) 1049dec214d0STahsin Erdogan { 1050dec214d0STahsin Erdogan struct inode *ea_inode; 1051dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 1052dec214d0STahsin Erdogan struct ext4_xattr_entry *failed_entry; 1053dec214d0STahsin Erdogan unsigned int ea_ino; 1054dec214d0STahsin Erdogan int err, saved_err; 1055dec214d0STahsin Erdogan 1056dec214d0STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 1057dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1058dec214d0STahsin Erdogan if (!entry->e_value_inum) 1059dec214d0STahsin Erdogan continue; 1060dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1061dec214d0STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, &ea_inode); 1062dec214d0STahsin Erdogan if (err) 1063dec214d0STahsin Erdogan goto cleanup; 1064dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1065dec214d0STahsin Erdogan if (err) { 1066dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "inc ref error %d", err); 1067dec214d0STahsin Erdogan iput(ea_inode); 1068dec214d0STahsin Erdogan goto cleanup; 1069dec214d0STahsin Erdogan } 1070dec214d0STahsin Erdogan iput(ea_inode); 1071dec214d0STahsin Erdogan } 1072dec214d0STahsin Erdogan return 0; 1073dec214d0STahsin Erdogan 1074dec214d0STahsin Erdogan cleanup: 1075dec214d0STahsin Erdogan saved_err = err; 1076dec214d0STahsin Erdogan failed_entry = entry; 1077dec214d0STahsin Erdogan 1078dec214d0STahsin Erdogan for (entry = first; entry != failed_entry; 1079dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1080dec214d0STahsin Erdogan if (!entry->e_value_inum) 1081dec214d0STahsin Erdogan continue; 1082dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1083dec214d0STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, &ea_inode); 1084dec214d0STahsin Erdogan if (err) { 1085dec214d0STahsin Erdogan ext4_warning(parent->i_sb, 1086dec214d0STahsin Erdogan "cleanup ea_ino %u iget error %d", ea_ino, 1087dec214d0STahsin Erdogan err); 1088dec214d0STahsin Erdogan continue; 1089dec214d0STahsin Erdogan } 1090dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1091dec214d0STahsin Erdogan if (err) 1092dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "cleanup dec ref error %d", 1093dec214d0STahsin Erdogan err); 1094dec214d0STahsin Erdogan iput(ea_inode); 1095dec214d0STahsin Erdogan } 1096dec214d0STahsin Erdogan return saved_err; 1097dec214d0STahsin Erdogan } 1098dec214d0STahsin Erdogan 109930a7eb97STahsin Erdogan static void 1100dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, 110130a7eb97STahsin Erdogan struct buffer_head *bh, 110230a7eb97STahsin Erdogan struct ext4_xattr_entry *first, bool block_csum, 110330a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1104dec214d0STahsin Erdogan int extra_credits, bool skip_quota) 110530a7eb97STahsin Erdogan { 110630a7eb97STahsin Erdogan struct inode *ea_inode; 110730a7eb97STahsin Erdogan struct ext4_xattr_entry *entry; 110830a7eb97STahsin Erdogan bool dirty = false; 110930a7eb97STahsin Erdogan unsigned int ea_ino; 111030a7eb97STahsin Erdogan int err; 111130a7eb97STahsin Erdogan int credits; 111230a7eb97STahsin Erdogan 111330a7eb97STahsin Erdogan /* One credit for dec ref on ea_inode, one for orphan list addition, */ 111430a7eb97STahsin Erdogan credits = 2 + extra_credits; 111530a7eb97STahsin Erdogan 111630a7eb97STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 111730a7eb97STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 111830a7eb97STahsin Erdogan if (!entry->e_value_inum) 111930a7eb97STahsin Erdogan continue; 112030a7eb97STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 112130a7eb97STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, &ea_inode); 112230a7eb97STahsin Erdogan if (err) 112330a7eb97STahsin Erdogan continue; 112430a7eb97STahsin Erdogan 112530a7eb97STahsin Erdogan err = ext4_expand_inode_array(ea_inode_array, ea_inode); 112630a7eb97STahsin Erdogan if (err) { 112730a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, 112830a7eb97STahsin Erdogan "Expand inode array err=%d", err); 112930a7eb97STahsin Erdogan iput(ea_inode); 113030a7eb97STahsin Erdogan continue; 113130a7eb97STahsin Erdogan } 113230a7eb97STahsin Erdogan 113330a7eb97STahsin Erdogan err = ext4_xattr_ensure_credits(handle, parent, credits, bh, 113430a7eb97STahsin Erdogan dirty, block_csum); 113530a7eb97STahsin Erdogan if (err) { 113630a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, "Ensure credits err=%d", 113730a7eb97STahsin Erdogan err); 113830a7eb97STahsin Erdogan continue; 113930a7eb97STahsin Erdogan } 114030a7eb97STahsin Erdogan 1141dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1142dec214d0STahsin Erdogan if (err) { 1143dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", 1144dec214d0STahsin Erdogan err); 1145dec214d0STahsin Erdogan continue; 1146dec214d0STahsin Erdogan } 1147dec214d0STahsin Erdogan 1148dec214d0STahsin Erdogan if (!skip_quota) 1149dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(parent, 1150dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 115130a7eb97STahsin Erdogan 115230a7eb97STahsin Erdogan /* 115330a7eb97STahsin Erdogan * Forget about ea_inode within the same transaction that 115430a7eb97STahsin Erdogan * decrements the ref count. This avoids duplicate decrements in 115530a7eb97STahsin Erdogan * case the rest of the work spills over to subsequent 115630a7eb97STahsin Erdogan * transactions. 115730a7eb97STahsin Erdogan */ 115830a7eb97STahsin Erdogan entry->e_value_inum = 0; 115930a7eb97STahsin Erdogan entry->e_value_size = 0; 116030a7eb97STahsin Erdogan 116130a7eb97STahsin Erdogan dirty = true; 116230a7eb97STahsin Erdogan } 116330a7eb97STahsin Erdogan 116430a7eb97STahsin Erdogan if (dirty) { 116530a7eb97STahsin Erdogan /* 116630a7eb97STahsin Erdogan * Note that we are deliberately skipping csum calculation for 116730a7eb97STahsin Erdogan * the final update because we do not expect any journal 116830a7eb97STahsin Erdogan * restarts until xattr block is freed. 116930a7eb97STahsin Erdogan */ 117030a7eb97STahsin Erdogan 117130a7eb97STahsin Erdogan err = ext4_handle_dirty_metadata(handle, NULL, bh); 117230a7eb97STahsin Erdogan if (err) 117330a7eb97STahsin Erdogan ext4_warning_inode(parent, 117430a7eb97STahsin Erdogan "handle dirty metadata err=%d", err); 117530a7eb97STahsin Erdogan } 117630a7eb97STahsin Erdogan } 117730a7eb97STahsin Erdogan 1178ac27a0ecSDave Kleikamp /* 1179ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 1180ec4cb1aaSJan Kara * otherwise free the block. 1181ac27a0ecSDave Kleikamp */ 1182ac27a0ecSDave Kleikamp static void 1183617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 1184dec214d0STahsin Erdogan struct buffer_head *bh, 1185dec214d0STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1186dec214d0STahsin Erdogan int extra_credits) 1187ac27a0ecSDave Kleikamp { 118847387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 11896048c64bSAndreas Gruenbacher u32 hash, ref; 11908a2bfdcbSMingming Cao int error = 0; 1191ac27a0ecSDave Kleikamp 11925d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 11938a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 11948a2bfdcbSMingming Cao if (error) 11958a2bfdcbSMingming Cao goto out; 11968a2bfdcbSMingming Cao 11978a2bfdcbSMingming Cao lock_buffer(bh); 11986048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 11996048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 12006048c64bSAndreas Gruenbacher if (ref == 1) { 1201ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 120282939d79SJan Kara /* 120382939d79SJan Kara * This must happen under buffer lock for 120482939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 120582939d79SJan Kara */ 1206cdb7ee4cSTahsin Erdogan if (ea_block_cache) 1207cdb7ee4cSTahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, 1208cdb7ee4cSTahsin Erdogan bh->b_blocknr); 1209ac27a0ecSDave Kleikamp get_bh(bh); 1210ec4cb1aaSJan Kara unlock_buffer(bh); 1211dec214d0STahsin Erdogan 1212dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) 1213dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, bh, 1214dec214d0STahsin Erdogan BFIRST(bh), 1215dec214d0STahsin Erdogan true /* block_csum */, 1216dec214d0STahsin Erdogan ea_inode_array, 1217dec214d0STahsin Erdogan extra_credits, 1218dec214d0STahsin Erdogan true /* skip_quota */); 1219e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 1220e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 1221e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 1222ac27a0ecSDave Kleikamp } else { 12236048c64bSAndreas Gruenbacher ref--; 12246048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 12256048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 12266048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 12276048c64bSAndreas Gruenbacher 1228cdb7ee4cSTahsin Erdogan if (ea_block_cache) { 122947387409STahsin Erdogan ce = mb_cache_entry_get(ea_block_cache, hash, 12306048c64bSAndreas Gruenbacher bh->b_blocknr); 12316048c64bSAndreas Gruenbacher if (ce) { 12326048c64bSAndreas Gruenbacher ce->e_reusable = 1; 123347387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 12346048c64bSAndreas Gruenbacher } 12356048c64bSAndreas Gruenbacher } 1236cdb7ee4cSTahsin Erdogan } 12376048c64bSAndreas Gruenbacher 1238dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bh); 1239ec4cb1aaSJan Kara /* 1240ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 1241ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 1242ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 1243ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 1244ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 1245dac7a4b4STheodore Ts'o * call ext4_handle_dirty_metadata() with locked buffer as 1246ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 1247ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 1248ec4cb1aaSJan Kara */ 1249ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 1250dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1251c1bb05a6SEric Sandeen unlock_buffer(bh); 1252ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 1253dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1254ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 12550390131bSFrank Mayhar ext4_handle_sync(handle); 12561231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 1257ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 1258ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 1259ac27a0ecSDave Kleikamp } 12608a2bfdcbSMingming Cao out: 12618a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 12628a2bfdcbSMingming Cao return; 1263ac27a0ecSDave Kleikamp } 1264ac27a0ecSDave Kleikamp 12656dd4ee7cSKalpak Shah /* 12666dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 12676dd4ee7cSKalpak Shah * bytes used by EA entries. 12686dd4ee7cSKalpak Shah */ 12696dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 12706dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 12716dd4ee7cSKalpak Shah { 12726dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1273e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 12746dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 12756dd4ee7cSKalpak Shah if (offs < *min_offs) 12766dd4ee7cSKalpak Shah *min_offs = offs; 12776dd4ee7cSKalpak Shah } 12787b1b2c1bSTheodore Ts'o if (total) 12797b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 12806dd4ee7cSKalpak Shah } 12816dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 12826dd4ee7cSKalpak Shah } 12836dd4ee7cSKalpak Shah 1284e50e5129SAndreas Dilger /* 1285e50e5129SAndreas Dilger * Write the value of the EA in an inode. 1286e50e5129SAndreas Dilger */ 1287e50e5129SAndreas Dilger static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, 1288e50e5129SAndreas Dilger const void *buf, int bufsize) 1289e50e5129SAndreas Dilger { 1290e50e5129SAndreas Dilger struct buffer_head *bh = NULL; 1291e50e5129SAndreas Dilger unsigned long block = 0; 1292dec214d0STahsin Erdogan int blocksize = ea_inode->i_sb->s_blocksize; 1293dec214d0STahsin Erdogan int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; 1294e50e5129SAndreas Dilger int csize, wsize = 0; 1295e50e5129SAndreas Dilger int ret = 0; 1296e50e5129SAndreas Dilger int retries = 0; 1297e50e5129SAndreas Dilger 1298e50e5129SAndreas Dilger retry: 1299e50e5129SAndreas Dilger while (ret >= 0 && ret < max_blocks) { 1300e50e5129SAndreas Dilger struct ext4_map_blocks map; 1301e50e5129SAndreas Dilger map.m_lblk = block += ret; 1302e50e5129SAndreas Dilger map.m_len = max_blocks -= ret; 1303e50e5129SAndreas Dilger 1304e50e5129SAndreas Dilger ret = ext4_map_blocks(handle, ea_inode, &map, 1305e50e5129SAndreas Dilger EXT4_GET_BLOCKS_CREATE); 1306e50e5129SAndreas Dilger if (ret <= 0) { 1307e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1308e50e5129SAndreas Dilger if (ret == -ENOSPC && 1309e50e5129SAndreas Dilger ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { 1310e50e5129SAndreas Dilger ret = 0; 1311e50e5129SAndreas Dilger goto retry; 1312e50e5129SAndreas Dilger } 1313e50e5129SAndreas Dilger break; 1314e50e5129SAndreas Dilger } 1315e50e5129SAndreas Dilger } 1316e50e5129SAndreas Dilger 1317e50e5129SAndreas Dilger if (ret < 0) 1318e50e5129SAndreas Dilger return ret; 1319e50e5129SAndreas Dilger 1320e50e5129SAndreas Dilger block = 0; 1321e50e5129SAndreas Dilger while (wsize < bufsize) { 1322e50e5129SAndreas Dilger if (bh != NULL) 1323e50e5129SAndreas Dilger brelse(bh); 1324e50e5129SAndreas Dilger csize = (bufsize - wsize) > blocksize ? blocksize : 1325e50e5129SAndreas Dilger bufsize - wsize; 1326e50e5129SAndreas Dilger bh = ext4_getblk(handle, ea_inode, block, 0); 1327e50e5129SAndreas Dilger if (IS_ERR(bh)) 1328e50e5129SAndreas Dilger return PTR_ERR(bh); 1329e50e5129SAndreas Dilger ret = ext4_journal_get_write_access(handle, bh); 1330e50e5129SAndreas Dilger if (ret) 1331e50e5129SAndreas Dilger goto out; 1332e50e5129SAndreas Dilger 1333e50e5129SAndreas Dilger memcpy(bh->b_data, buf, csize); 1334e50e5129SAndreas Dilger set_buffer_uptodate(bh); 1335e50e5129SAndreas Dilger ext4_handle_dirty_metadata(handle, ea_inode, bh); 1336e50e5129SAndreas Dilger 1337e50e5129SAndreas Dilger buf += csize; 1338e50e5129SAndreas Dilger wsize += csize; 1339e50e5129SAndreas Dilger block += 1; 1340e50e5129SAndreas Dilger } 1341e50e5129SAndreas Dilger 1342e50e5129SAndreas Dilger inode_lock(ea_inode); 1343e50e5129SAndreas Dilger i_size_write(ea_inode, wsize); 1344e50e5129SAndreas Dilger ext4_update_i_disksize(ea_inode, wsize); 1345e50e5129SAndreas Dilger inode_unlock(ea_inode); 1346e50e5129SAndreas Dilger 1347e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1348e50e5129SAndreas Dilger 1349e50e5129SAndreas Dilger out: 1350e50e5129SAndreas Dilger brelse(bh); 1351e50e5129SAndreas Dilger 1352e50e5129SAndreas Dilger return ret; 1353e50e5129SAndreas Dilger } 1354e50e5129SAndreas Dilger 1355e50e5129SAndreas Dilger /* 1356e50e5129SAndreas Dilger * Create an inode to store the value of a large EA. 1357e50e5129SAndreas Dilger */ 1358e50e5129SAndreas Dilger static struct inode *ext4_xattr_inode_create(handle_t *handle, 1359dec214d0STahsin Erdogan struct inode *inode, u32 hash) 1360e50e5129SAndreas Dilger { 1361e50e5129SAndreas Dilger struct inode *ea_inode = NULL; 13629e1ba001STahsin Erdogan uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; 1363bd3b963bSTahsin Erdogan int err; 1364e50e5129SAndreas Dilger 1365e50e5129SAndreas Dilger /* 1366e50e5129SAndreas Dilger * Let the next inode be the goal, so we try and allocate the EA inode 1367e50e5129SAndreas Dilger * in the same group, or nearby one. 1368e50e5129SAndreas Dilger */ 1369e50e5129SAndreas Dilger ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, 13709e1ba001STahsin Erdogan S_IFREG | 0600, NULL, inode->i_ino + 1, owner, 13711b917ed8STahsin Erdogan EXT4_EA_INODE_FL); 1372e50e5129SAndreas Dilger if (!IS_ERR(ea_inode)) { 1373e50e5129SAndreas Dilger ea_inode->i_op = &ext4_file_inode_operations; 1374e50e5129SAndreas Dilger ea_inode->i_fop = &ext4_file_operations; 1375e50e5129SAndreas Dilger ext4_set_aops(ea_inode); 137633d201e0STahsin Erdogan ext4_xattr_inode_set_class(ea_inode); 1377e50e5129SAndreas Dilger unlock_new_inode(ea_inode); 1378dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, 1); 1379dec214d0STahsin Erdogan ext4_xattr_inode_set_hash(ea_inode, hash); 1380dec214d0STahsin Erdogan err = ext4_mark_inode_dirty(handle, ea_inode); 1381dec214d0STahsin Erdogan if (!err) 1382bd3b963bSTahsin Erdogan err = ext4_inode_attach_jinode(ea_inode); 1383bd3b963bSTahsin Erdogan if (err) { 1384bd3b963bSTahsin Erdogan iput(ea_inode); 1385bd3b963bSTahsin Erdogan return ERR_PTR(err); 1386bd3b963bSTahsin Erdogan } 1387dec214d0STahsin Erdogan 1388dec214d0STahsin Erdogan /* 1389dec214d0STahsin Erdogan * Xattr inodes are shared therefore quota charging is performed 1390dec214d0STahsin Erdogan * at a higher level. 1391dec214d0STahsin Erdogan */ 1392dec214d0STahsin Erdogan dquot_free_inode(ea_inode); 1393dec214d0STahsin Erdogan dquot_drop(ea_inode); 1394dec214d0STahsin Erdogan inode_lock(ea_inode); 1395dec214d0STahsin Erdogan ea_inode->i_flags |= S_NOQUOTA; 1396dec214d0STahsin Erdogan inode_unlock(ea_inode); 1397e50e5129SAndreas Dilger } 1398e50e5129SAndreas Dilger 1399e50e5129SAndreas Dilger return ea_inode; 1400e50e5129SAndreas Dilger } 1401e50e5129SAndreas Dilger 1402dec214d0STahsin Erdogan static struct inode * 1403dec214d0STahsin Erdogan ext4_xattr_inode_cache_find(struct inode *inode, const void *value, 1404dec214d0STahsin Erdogan size_t value_len, u32 hash) 1405e50e5129SAndreas Dilger { 1406dec214d0STahsin Erdogan struct inode *ea_inode; 1407dec214d0STahsin Erdogan struct mb_cache_entry *ce; 1408dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 1409dec214d0STahsin Erdogan void *ea_data; 1410e50e5129SAndreas Dilger 1411cdb7ee4cSTahsin Erdogan if (!ea_inode_cache) 1412cdb7ee4cSTahsin Erdogan return NULL; 1413cdb7ee4cSTahsin Erdogan 1414dec214d0STahsin Erdogan ce = mb_cache_entry_find_first(ea_inode_cache, hash); 1415dec214d0STahsin Erdogan if (!ce) 1416dec214d0STahsin Erdogan return NULL; 1417e50e5129SAndreas Dilger 1418dec214d0STahsin Erdogan ea_data = ext4_kvmalloc(value_len, GFP_NOFS); 1419dec214d0STahsin Erdogan if (!ea_data) { 1420dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1421dec214d0STahsin Erdogan return NULL; 1422dec214d0STahsin Erdogan } 1423dec214d0STahsin Erdogan 1424dec214d0STahsin Erdogan while (ce) { 1425dec214d0STahsin Erdogan ea_inode = ext4_iget(inode->i_sb, ce->e_value); 1426dec214d0STahsin Erdogan if (!IS_ERR(ea_inode) && 1427dec214d0STahsin Erdogan !is_bad_inode(ea_inode) && 1428dec214d0STahsin Erdogan (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && 1429dec214d0STahsin Erdogan i_size_read(ea_inode) == value_len && 1430dec214d0STahsin Erdogan !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && 1431b9fc761eSTahsin Erdogan !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, 1432dec214d0STahsin Erdogan value_len) && 1433dec214d0STahsin Erdogan !memcmp(value, ea_data, value_len)) { 1434dec214d0STahsin Erdogan mb_cache_entry_touch(ea_inode_cache, ce); 1435dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1436dec214d0STahsin Erdogan kvfree(ea_data); 1437dec214d0STahsin Erdogan return ea_inode; 1438dec214d0STahsin Erdogan } 1439dec214d0STahsin Erdogan 1440dec214d0STahsin Erdogan if (!IS_ERR(ea_inode)) 1441e50e5129SAndreas Dilger iput(ea_inode); 1442dec214d0STahsin Erdogan ce = mb_cache_entry_find_next(ea_inode_cache, ce); 1443dec214d0STahsin Erdogan } 1444dec214d0STahsin Erdogan kvfree(ea_data); 1445dec214d0STahsin Erdogan return NULL; 1446e50e5129SAndreas Dilger } 1447e50e5129SAndreas Dilger 1448e50e5129SAndreas Dilger /* 1449e50e5129SAndreas Dilger * Add value of the EA in an inode. 1450e50e5129SAndreas Dilger */ 1451dec214d0STahsin Erdogan static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, 1452dec214d0STahsin Erdogan const void *value, size_t value_len, 1453dec214d0STahsin Erdogan struct inode **ret_inode) 1454e50e5129SAndreas Dilger { 1455e50e5129SAndreas Dilger struct inode *ea_inode; 1456dec214d0STahsin Erdogan u32 hash; 1457e50e5129SAndreas Dilger int err; 1458e50e5129SAndreas Dilger 1459dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); 1460dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); 1461dec214d0STahsin Erdogan if (ea_inode) { 1462dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1463dec214d0STahsin Erdogan if (err) { 1464dec214d0STahsin Erdogan iput(ea_inode); 1465dec214d0STahsin Erdogan return err; 1466dec214d0STahsin Erdogan } 1467dec214d0STahsin Erdogan 1468dec214d0STahsin Erdogan *ret_inode = ea_inode; 1469dec214d0STahsin Erdogan return 0; 1470dec214d0STahsin Erdogan } 1471dec214d0STahsin Erdogan 1472e50e5129SAndreas Dilger /* Create an inode for the EA value */ 1473dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_create(handle, inode, hash); 1474e50e5129SAndreas Dilger if (IS_ERR(ea_inode)) 1475e50e5129SAndreas Dilger return PTR_ERR(ea_inode); 1476e50e5129SAndreas Dilger 1477e50e5129SAndreas Dilger err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); 1478dec214d0STahsin Erdogan if (err) { 1479dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref(handle, ea_inode); 1480e50e5129SAndreas Dilger iput(ea_inode); 1481e50e5129SAndreas Dilger return err; 1482e50e5129SAndreas Dilger } 1483e50e5129SAndreas Dilger 1484cdb7ee4cSTahsin Erdogan if (EA_INODE_CACHE(inode)) 1485dec214d0STahsin Erdogan mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, 1486dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 1487dec214d0STahsin Erdogan 1488dec214d0STahsin Erdogan *ret_inode = ea_inode; 1489dec214d0STahsin Erdogan return 0; 1490dec214d0STahsin Erdogan } 1491dec214d0STahsin Erdogan 14929c6e7853STahsin Erdogan /* 14939c6e7853STahsin Erdogan * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode 14949c6e7853STahsin Erdogan * feature is enabled. 14959c6e7853STahsin Erdogan */ 14969c6e7853STahsin Erdogan #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) 14979c6e7853STahsin Erdogan 1498e50e5129SAndreas Dilger static int ext4_xattr_set_entry(struct ext4_xattr_info *i, 1499e50e5129SAndreas Dilger struct ext4_xattr_search *s, 1500daf83281STahsin Erdogan handle_t *handle, struct inode *inode, 1501daf83281STahsin Erdogan bool is_block) 1502ac27a0ecSDave Kleikamp { 1503617ba13bSMingming Cao struct ext4_xattr_entry *last; 1504dec214d0STahsin Erdogan struct ext4_xattr_entry *here = s->here; 1505dec214d0STahsin Erdogan size_t min_offs = s->end - s->base, name_len = strlen(i->name); 1506e50e5129SAndreas Dilger int in_inode = i->in_inode; 1507dec214d0STahsin Erdogan struct inode *old_ea_inode = NULL; 1508dec214d0STahsin Erdogan struct inode *new_ea_inode = NULL; 1509dec214d0STahsin Erdogan size_t old_size, new_size; 1510dec214d0STahsin Erdogan int ret; 1511dec214d0STahsin Erdogan 1512dec214d0STahsin Erdogan /* Space used by old and new values. */ 1513dec214d0STahsin Erdogan old_size = (!s->not_found && !here->e_value_inum) ? 1514dec214d0STahsin Erdogan EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; 1515dec214d0STahsin Erdogan new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; 1516dec214d0STahsin Erdogan 1517dec214d0STahsin Erdogan /* 1518dec214d0STahsin Erdogan * Optimization for the simple case when old and new values have the 1519dec214d0STahsin Erdogan * same padded sizes. Not applicable if external inodes are involved. 1520dec214d0STahsin Erdogan */ 1521dec214d0STahsin Erdogan if (new_size && new_size == old_size) { 1522dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1523dec214d0STahsin Erdogan void *val = s->base + offs; 1524dec214d0STahsin Erdogan 1525dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1526dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1527dec214d0STahsin Erdogan memset(val, 0, new_size); 1528dec214d0STahsin Erdogan } else { 1529dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1530dec214d0STahsin Erdogan /* Clear padding bytes. */ 1531dec214d0STahsin Erdogan memset(val + i->value_len, 0, new_size - i->value_len); 1532dec214d0STahsin Erdogan } 1533dec214d0STahsin Erdogan return 0; 1534dec214d0STahsin Erdogan } 1535e50e5129SAndreas Dilger 1536ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 1537ac27a0ecSDave Kleikamp last = s->first; 1538617ba13bSMingming Cao for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1539e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 1540ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 1541ac27a0ecSDave Kleikamp if (offs < min_offs) 1542ac27a0ecSDave Kleikamp min_offs = offs; 1543ac27a0ecSDave Kleikamp } 1544ac27a0ecSDave Kleikamp } 1545dec214d0STahsin Erdogan 1546dec214d0STahsin Erdogan /* Check whether we have enough space. */ 1547ac27a0ecSDave Kleikamp if (i->value) { 1548dec214d0STahsin Erdogan size_t free; 1549e50e5129SAndreas Dilger 1550dec214d0STahsin Erdogan free = min_offs - ((void *)last - s->base) - sizeof(__u32); 1551dec214d0STahsin Erdogan if (!s->not_found) 1552dec214d0STahsin Erdogan free += EXT4_XATTR_LEN(name_len) + old_size; 1553e50e5129SAndreas Dilger 1554dec214d0STahsin Erdogan if (free < EXT4_XATTR_LEN(name_len) + new_size) { 1555dec214d0STahsin Erdogan ret = -ENOSPC; 1556dec214d0STahsin Erdogan goto out; 1557dec214d0STahsin Erdogan } 15589c6e7853STahsin Erdogan 15599c6e7853STahsin Erdogan /* 15609c6e7853STahsin Erdogan * If storing the value in an external inode is an option, 15619c6e7853STahsin Erdogan * reserve space for xattr entries/names in the external 15629c6e7853STahsin Erdogan * attribute block so that a long value does not occupy the 15639c6e7853STahsin Erdogan * whole space and prevent futher entries being added. 15649c6e7853STahsin Erdogan */ 1565daf83281STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 1566daf83281STahsin Erdogan new_size && is_block && 15679c6e7853STahsin Erdogan (min_offs + old_size - new_size) < 15689c6e7853STahsin Erdogan EXT4_XATTR_BLOCK_RESERVE(inode)) { 15699c6e7853STahsin Erdogan ret = -ENOSPC; 15709c6e7853STahsin Erdogan goto out; 15719c6e7853STahsin Erdogan } 1572ac27a0ecSDave Kleikamp } 1573ac27a0ecSDave Kleikamp 1574dec214d0STahsin Erdogan /* 1575dec214d0STahsin Erdogan * Getting access to old and new ea inodes is subject to failures. 1576dec214d0STahsin Erdogan * Finish that work before doing any modifications to the xattr data. 1577dec214d0STahsin Erdogan */ 1578dec214d0STahsin Erdogan if (!s->not_found && here->e_value_inum) { 1579dec214d0STahsin Erdogan ret = ext4_xattr_inode_iget(inode, 1580dec214d0STahsin Erdogan le32_to_cpu(here->e_value_inum), 1581dec214d0STahsin Erdogan &old_ea_inode); 1582dec214d0STahsin Erdogan if (ret) { 1583dec214d0STahsin Erdogan old_ea_inode = NULL; 1584dec214d0STahsin Erdogan goto out; 1585bd9926e8STheodore Ts'o } 1586dec214d0STahsin Erdogan } 1587dec214d0STahsin Erdogan if (i->value && in_inode) { 1588dec214d0STahsin Erdogan WARN_ON_ONCE(!i->value_len); 1589dec214d0STahsin Erdogan 1590dec214d0STahsin Erdogan ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); 1591dec214d0STahsin Erdogan if (ret) 1592dec214d0STahsin Erdogan goto out; 1593dec214d0STahsin Erdogan 1594dec214d0STahsin Erdogan ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, 1595dec214d0STahsin Erdogan i->value_len, 1596dec214d0STahsin Erdogan &new_ea_inode); 1597dec214d0STahsin Erdogan if (ret) { 1598dec214d0STahsin Erdogan new_ea_inode = NULL; 1599dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, i->value_len); 1600dec214d0STahsin Erdogan goto out; 1601dec214d0STahsin Erdogan } 1602ac27a0ecSDave Kleikamp } 1603ac27a0ecSDave Kleikamp 1604dec214d0STahsin Erdogan if (old_ea_inode) { 1605dec214d0STahsin Erdogan /* We are ready to release ref count on the old_ea_inode. */ 1606dec214d0STahsin Erdogan ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); 1607dec214d0STahsin Erdogan if (ret) { 1608dec214d0STahsin Erdogan /* Release newly required ref count on new_ea_inode. */ 1609dec214d0STahsin Erdogan if (new_ea_inode) { 1610dec214d0STahsin Erdogan int err; 1611dec214d0STahsin Erdogan 1612dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, 1613dec214d0STahsin Erdogan new_ea_inode); 1614dec214d0STahsin Erdogan if (err) 1615dec214d0STahsin Erdogan ext4_warning_inode(new_ea_inode, 1616dec214d0STahsin Erdogan "dec ref new_ea_inode err=%d", 1617dec214d0STahsin Erdogan err); 1618dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 1619dec214d0STahsin Erdogan i->value_len); 1620dec214d0STahsin Erdogan } 1621dec214d0STahsin Erdogan goto out; 1622dec214d0STahsin Erdogan } 1623dec214d0STahsin Erdogan 1624dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 1625dec214d0STahsin Erdogan le32_to_cpu(here->e_value_size)); 1626dec214d0STahsin Erdogan } 1627dec214d0STahsin Erdogan 1628dec214d0STahsin Erdogan /* No failures allowed past this point. */ 1629dec214d0STahsin Erdogan 1630dec214d0STahsin Erdogan if (!s->not_found && here->e_value_offs) { 1631ac27a0ecSDave Kleikamp /* Remove the old value. */ 1632dec214d0STahsin Erdogan void *first_val = s->base + min_offs; 1633dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1634dec214d0STahsin Erdogan void *val = s->base + offs; 1635dec214d0STahsin Erdogan 1636dec214d0STahsin Erdogan memmove(first_val + old_size, first_val, val - first_val); 1637dec214d0STahsin Erdogan memset(first_val, 0, old_size); 1638dec214d0STahsin Erdogan min_offs += old_size; 1639ac27a0ecSDave Kleikamp 1640ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 1641ac27a0ecSDave Kleikamp last = s->first; 1642ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 1643ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 1644dec214d0STahsin Erdogan 1645e50e5129SAndreas Dilger if (!last->e_value_inum && 1646e50e5129SAndreas Dilger last->e_value_size && o < offs) 1647dec214d0STahsin Erdogan last->e_value_offs = cpu_to_le16(o + old_size); 1648617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 1649ac27a0ecSDave Kleikamp } 1650ac27a0ecSDave Kleikamp } 1651dec214d0STahsin Erdogan 1652ac27a0ecSDave Kleikamp if (!i->value) { 1653dec214d0STahsin Erdogan /* Remove old name. */ 1654617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 1655dec214d0STahsin Erdogan 1656ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 1657dec214d0STahsin Erdogan memmove(here, (void *)here + size, 1658dec214d0STahsin Erdogan (void *)last - (void *)here + sizeof(__u32)); 1659ac27a0ecSDave Kleikamp memset(last, 0, size); 1660dec214d0STahsin Erdogan } else if (s->not_found) { 1661dec214d0STahsin Erdogan /* Insert new name. */ 1662dec214d0STahsin Erdogan size_t size = EXT4_XATTR_LEN(name_len); 1663dec214d0STahsin Erdogan size_t rest = (void *)last - (void *)here + sizeof(__u32); 1664dec214d0STahsin Erdogan 1665dec214d0STahsin Erdogan memmove((void *)here + size, here, rest); 1666dec214d0STahsin Erdogan memset(here, 0, size); 1667dec214d0STahsin Erdogan here->e_name_index = i->name_index; 1668dec214d0STahsin Erdogan here->e_name_len = name_len; 1669dec214d0STahsin Erdogan memcpy(here->e_name, i->name, name_len); 1670dec214d0STahsin Erdogan } else { 1671dec214d0STahsin Erdogan /* This is an update, reset value info. */ 1672dec214d0STahsin Erdogan here->e_value_inum = 0; 1673dec214d0STahsin Erdogan here->e_value_offs = 0; 1674dec214d0STahsin Erdogan here->e_value_size = 0; 1675ac27a0ecSDave Kleikamp } 1676ac27a0ecSDave Kleikamp 1677ac27a0ecSDave Kleikamp if (i->value) { 1678dec214d0STahsin Erdogan /* Insert new value. */ 1679e50e5129SAndreas Dilger if (in_inode) { 1680dec214d0STahsin Erdogan here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); 1681e50e5129SAndreas Dilger } else if (i->value_len) { 1682dec214d0STahsin Erdogan void *val = s->base + min_offs - new_size; 1683e50e5129SAndreas Dilger 1684dec214d0STahsin Erdogan here->e_value_offs = cpu_to_le16(min_offs - new_size); 1685dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1686dec214d0STahsin Erdogan memset(val, 0, new_size); 1687dec214d0STahsin Erdogan } else { 1688dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1689dec214d0STahsin Erdogan /* Clear padding bytes. */ 1690dec214d0STahsin Erdogan memset(val + i->value_len, 0, 1691dec214d0STahsin Erdogan new_size - i->value_len); 1692dec214d0STahsin Erdogan } 1693dec214d0STahsin Erdogan } 1694dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1695dec214d0STahsin Erdogan } 1696daf83281STahsin Erdogan 1697b9fc761eSTahsin Erdogan if (i->value) { 1698b9fc761eSTahsin Erdogan __le32 hash = 0; 1699b9fc761eSTahsin Erdogan 1700b9fc761eSTahsin Erdogan /* Entry hash calculation. */ 1701b9fc761eSTahsin Erdogan if (in_inode) { 1702b9fc761eSTahsin Erdogan __le32 crc32c_hash; 1703b9fc761eSTahsin Erdogan 1704b9fc761eSTahsin Erdogan /* 1705b9fc761eSTahsin Erdogan * Feed crc32c hash instead of the raw value for entry 1706b9fc761eSTahsin Erdogan * hash calculation. This is to avoid walking 1707b9fc761eSTahsin Erdogan * potentially long value buffer again. 1708b9fc761eSTahsin Erdogan */ 1709b9fc761eSTahsin Erdogan crc32c_hash = cpu_to_le32( 1710b9fc761eSTahsin Erdogan ext4_xattr_inode_get_hash(new_ea_inode)); 1711b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1712b9fc761eSTahsin Erdogan here->e_name_len, 1713b9fc761eSTahsin Erdogan &crc32c_hash, 1); 1714b9fc761eSTahsin Erdogan } else if (is_block) { 1715b9fc761eSTahsin Erdogan __le32 *value = s->base + min_offs - new_size; 1716b9fc761eSTahsin Erdogan 1717b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1718b9fc761eSTahsin Erdogan here->e_name_len, value, 1719b9fc761eSTahsin Erdogan new_size >> 2); 1720daf83281STahsin Erdogan } 1721b9fc761eSTahsin Erdogan here->e_hash = hash; 1722b9fc761eSTahsin Erdogan } 1723b9fc761eSTahsin Erdogan 1724b9fc761eSTahsin Erdogan if (is_block) 1725b9fc761eSTahsin Erdogan ext4_xattr_rehash((struct ext4_xattr_header *)s->base); 1726daf83281STahsin Erdogan 1727dec214d0STahsin Erdogan ret = 0; 1728e50e5129SAndreas Dilger out: 1729dec214d0STahsin Erdogan iput(old_ea_inode); 1730dec214d0STahsin Erdogan iput(new_ea_inode); 1731dec214d0STahsin Erdogan return ret; 1732ac27a0ecSDave Kleikamp } 1733ac27a0ecSDave Kleikamp 1734617ba13bSMingming Cao struct ext4_xattr_block_find { 1735617ba13bSMingming Cao struct ext4_xattr_search s; 1736ac27a0ecSDave Kleikamp struct buffer_head *bh; 1737ac27a0ecSDave Kleikamp }; 1738ac27a0ecSDave Kleikamp 1739ac27a0ecSDave Kleikamp static int 1740617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 1741617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1742ac27a0ecSDave Kleikamp { 1743ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1744ac27a0ecSDave Kleikamp int error; 1745ac27a0ecSDave Kleikamp 1746ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 1747ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 1748ac27a0ecSDave Kleikamp 1749617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 1750ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 1751617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 1752ac27a0ecSDave Kleikamp error = -EIO; 1753ac27a0ecSDave Kleikamp if (!bs->bh) 1754ac27a0ecSDave Kleikamp goto cleanup; 1755ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 1756ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 1757ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 1758cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bs->bh)) { 175924676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 176024676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 17616a797d27SDarrick J. Wong error = -EFSCORRUPTED; 1762ac27a0ecSDave Kleikamp goto cleanup; 1763ac27a0ecSDave Kleikamp } 1764ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1765ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 1766ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 1767ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 1768ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 1769617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 17706ba644b9SEric Biggers i->name, 1); 1771ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1772ac27a0ecSDave Kleikamp goto cleanup; 1773ac27a0ecSDave Kleikamp bs->s.not_found = error; 1774ac27a0ecSDave Kleikamp } 1775ac27a0ecSDave Kleikamp error = 0; 1776ac27a0ecSDave Kleikamp 1777ac27a0ecSDave Kleikamp cleanup: 1778ac27a0ecSDave Kleikamp return error; 1779ac27a0ecSDave Kleikamp } 1780ac27a0ecSDave Kleikamp 1781ac27a0ecSDave Kleikamp static int 1782617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 1783617ba13bSMingming Cao struct ext4_xattr_info *i, 1784617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1785ac27a0ecSDave Kleikamp { 1786ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1787ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 1788b347e2bcSTahsin Erdogan struct ext4_xattr_search s_copy = bs->s; 1789b347e2bcSTahsin Erdogan struct ext4_xattr_search *s = &s_copy; 17907a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 17918a2bfdcbSMingming Cao int error = 0; 179247387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 1793dec214d0STahsin Erdogan struct inode *ea_inode = NULL; 1794dec214d0STahsin Erdogan size_t old_ea_inode_size = 0; 1795ac27a0ecSDave Kleikamp 1796617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 1797ac27a0ecSDave Kleikamp 1798ac27a0ecSDave Kleikamp if (s->base) { 17995d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 18008a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 18018a2bfdcbSMingming Cao if (error) 18028a2bfdcbSMingming Cao goto cleanup; 18038a2bfdcbSMingming Cao lock_buffer(bs->bh); 18048a2bfdcbSMingming Cao 1805ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 180682939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 180782939d79SJan Kara 180882939d79SJan Kara /* 180982939d79SJan Kara * This must happen under buffer lock for 181082939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 181182939d79SJan Kara * block 181282939d79SJan Kara */ 1813cdb7ee4cSTahsin Erdogan if (ea_block_cache) 181447387409STahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, 181582939d79SJan Kara bs->bh->b_blocknr); 1816ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 1817daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 1818daf83281STahsin Erdogan true /* is_block */); 1819dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bs->bh); 1820ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 18216a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1822ac27a0ecSDave Kleikamp goto bad_block; 1823ac27a0ecSDave Kleikamp if (!error) 1824dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 18250390131bSFrank Mayhar inode, 1826ac27a0ecSDave Kleikamp bs->bh); 1827ac27a0ecSDave Kleikamp if (error) 1828ac27a0ecSDave Kleikamp goto cleanup; 1829ac27a0ecSDave Kleikamp goto inserted; 1830ac27a0ecSDave Kleikamp } else { 1831ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 1832ac27a0ecSDave Kleikamp 18338a2bfdcbSMingming Cao unlock_buffer(bs->bh); 1834ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 1835216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 1836ac27a0ecSDave Kleikamp error = -ENOMEM; 1837ac27a0ecSDave Kleikamp if (s->base == NULL) 1838ac27a0ecSDave Kleikamp goto cleanup; 1839ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 1840ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1841ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1842ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 1843ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 1844dec214d0STahsin Erdogan 1845dec214d0STahsin Erdogan /* 1846dec214d0STahsin Erdogan * If existing entry points to an xattr inode, we need 1847dec214d0STahsin Erdogan * to prevent ext4_xattr_set_entry() from decrementing 1848dec214d0STahsin Erdogan * ref count on it because the reference belongs to the 1849dec214d0STahsin Erdogan * original block. In this case, make the entry look 1850dec214d0STahsin Erdogan * like it has an empty value. 1851dec214d0STahsin Erdogan */ 1852dec214d0STahsin Erdogan if (!s->not_found && s->here->e_value_inum) { 1853dec214d0STahsin Erdogan /* 1854dec214d0STahsin Erdogan * Defer quota free call for previous inode 1855dec214d0STahsin Erdogan * until success is guaranteed. 1856dec214d0STahsin Erdogan */ 1857dec214d0STahsin Erdogan old_ea_inode_size = le32_to_cpu( 1858dec214d0STahsin Erdogan s->here->e_value_size); 1859dec214d0STahsin Erdogan s->here->e_value_inum = 0; 1860dec214d0STahsin Erdogan s->here->e_value_size = 0; 1861dec214d0STahsin Erdogan } 1862ac27a0ecSDave Kleikamp } 1863ac27a0ecSDave Kleikamp } else { 1864ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 1865216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 1866ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 1867ac27a0ecSDave Kleikamp error = -ENOMEM; 1868ac27a0ecSDave Kleikamp if (s->base == NULL) 1869ac27a0ecSDave Kleikamp goto cleanup; 1870617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 1871ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 1872ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1873ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1874ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 1875ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 1876ac27a0ecSDave Kleikamp } 1877ac27a0ecSDave Kleikamp 1878daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); 18796a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1880ac27a0ecSDave Kleikamp goto bad_block; 1881ac27a0ecSDave Kleikamp if (error) 1882ac27a0ecSDave Kleikamp goto cleanup; 1883dec214d0STahsin Erdogan 1884dec214d0STahsin Erdogan if (i->value && s->here->e_value_inum) { 1885dec214d0STahsin Erdogan unsigned int ea_ino; 1886dec214d0STahsin Erdogan 1887dec214d0STahsin Erdogan /* 1888dec214d0STahsin Erdogan * A ref count on ea_inode has been taken as part of the call to 1889dec214d0STahsin Erdogan * ext4_xattr_set_entry() above. We would like to drop this 1890dec214d0STahsin Erdogan * extra ref but we have to wait until the xattr block is 1891dec214d0STahsin Erdogan * initialized and has its own ref count on the ea_inode. 1892dec214d0STahsin Erdogan */ 1893dec214d0STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 1894dec214d0STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, &ea_inode); 1895dec214d0STahsin Erdogan if (error) { 1896dec214d0STahsin Erdogan ea_inode = NULL; 1897dec214d0STahsin Erdogan goto cleanup; 1898dec214d0STahsin Erdogan } 1899dec214d0STahsin Erdogan } 1900dec214d0STahsin Erdogan 1901ac27a0ecSDave Kleikamp inserted: 1902ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 190347387409STahsin Erdogan new_bh = ext4_xattr_block_cache_find(inode, header(s->base), 190447387409STahsin Erdogan &ce); 1905ac27a0ecSDave Kleikamp if (new_bh) { 1906ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 1907ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 1908ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 1909ac27a0ecSDave Kleikamp else { 19106048c64bSAndreas Gruenbacher u32 ref; 19116048c64bSAndreas Gruenbacher 1912b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 1913b8cb5a54STahsin Erdogan 1914ac27a0ecSDave Kleikamp /* The old block is released after updating 1915ac27a0ecSDave Kleikamp the inode. */ 19161231b3a1SLukas Czerner error = dquot_alloc_block(inode, 19171231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 19185dd4056dSChristoph Hellwig if (error) 1919ac27a0ecSDave Kleikamp goto cleanup; 19205d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 1921617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 1922ac27a0ecSDave Kleikamp new_bh); 1923ac27a0ecSDave Kleikamp if (error) 1924ac27a0ecSDave Kleikamp goto cleanup_dquot; 1925ac27a0ecSDave Kleikamp lock_buffer(new_bh); 192682939d79SJan Kara /* 192782939d79SJan Kara * We have to be careful about races with 19286048c64bSAndreas Gruenbacher * freeing, rehashing or adding references to 19296048c64bSAndreas Gruenbacher * xattr block. Once we hold buffer lock xattr 19306048c64bSAndreas Gruenbacher * block's state is stable so we can check 19316048c64bSAndreas Gruenbacher * whether the block got freed / rehashed or 19326048c64bSAndreas Gruenbacher * not. Since we unhash mbcache entry under 19336048c64bSAndreas Gruenbacher * buffer lock when freeing / rehashing xattr 19346048c64bSAndreas Gruenbacher * block, checking whether entry is still 19356048c64bSAndreas Gruenbacher * hashed is reliable. Same rules hold for 19366048c64bSAndreas Gruenbacher * e_reusable handling. 193782939d79SJan Kara */ 19386048c64bSAndreas Gruenbacher if (hlist_bl_unhashed(&ce->e_hash_list) || 19396048c64bSAndreas Gruenbacher !ce->e_reusable) { 194082939d79SJan Kara /* 194182939d79SJan Kara * Undo everything and check mbcache 194282939d79SJan Kara * again. 194382939d79SJan Kara */ 194482939d79SJan Kara unlock_buffer(new_bh); 194582939d79SJan Kara dquot_free_block(inode, 194682939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 194782939d79SJan Kara 1)); 194882939d79SJan Kara brelse(new_bh); 194947387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 195082939d79SJan Kara ce = NULL; 195182939d79SJan Kara new_bh = NULL; 195282939d79SJan Kara goto inserted; 195382939d79SJan Kara } 19546048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 19556048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 19566048c64bSAndreas Gruenbacher if (ref >= EXT4_XATTR_REFCOUNT_MAX) 19576048c64bSAndreas Gruenbacher ce->e_reusable = 0; 1958ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 19596048c64bSAndreas Gruenbacher ref); 1960dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 1961ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 1962dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 19630390131bSFrank Mayhar inode, 1964ac27a0ecSDave Kleikamp new_bh); 1965ac27a0ecSDave Kleikamp if (error) 1966ac27a0ecSDave Kleikamp goto cleanup_dquot; 1967ac27a0ecSDave Kleikamp } 196847387409STahsin Erdogan mb_cache_entry_touch(ea_block_cache, ce); 196947387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 1970ac27a0ecSDave Kleikamp ce = NULL; 1971ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 1972ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 1973ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 1974*ec000220STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); 1975ac27a0ecSDave Kleikamp new_bh = bs->bh; 1976ac27a0ecSDave Kleikamp get_bh(new_bh); 1977ac27a0ecSDave Kleikamp } else { 1978ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 1979fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 1980fb0a387dSEric Sandeen 1981b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 1982b8cb5a54STahsin Erdogan 1983fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 1984d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 1985fb0a387dSEric Sandeen 1986fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 198712e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 1988fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 1989fb0a387dSEric Sandeen 199055f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 199155f020dbSAllison Henderson NULL, &error); 1992ac27a0ecSDave Kleikamp if (error) 1993ac27a0ecSDave Kleikamp goto cleanup; 1994fb0a387dSEric Sandeen 199512e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 1996fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 1997fb0a387dSEric Sandeen 1998ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 1999ace36ad4SJoe Perches (unsigned long long)block); 2000ac27a0ecSDave Kleikamp 2001ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 2002aebf0243SWang Shilong if (unlikely(!new_bh)) { 2003860d21e2STheodore Ts'o error = -ENOMEM; 2004ac27a0ecSDave Kleikamp getblk_failed: 20057dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 2006e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 2007ac27a0ecSDave Kleikamp goto cleanup; 2008ac27a0ecSDave Kleikamp } 2009dec214d0STahsin Erdogan error = ext4_xattr_inode_inc_ref_all(handle, inode, 2010dec214d0STahsin Erdogan ENTRY(header(s->base)+1)); 2011dec214d0STahsin Erdogan if (error) 2012dec214d0STahsin Erdogan goto getblk_failed; 2013dec214d0STahsin Erdogan if (ea_inode) { 2014dec214d0STahsin Erdogan /* Drop the extra ref on ea_inode. */ 2015dec214d0STahsin Erdogan error = ext4_xattr_inode_dec_ref(handle, 2016dec214d0STahsin Erdogan ea_inode); 2017dec214d0STahsin Erdogan if (error) 2018dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 2019dec214d0STahsin Erdogan "dec ref error=%d", 2020dec214d0STahsin Erdogan error); 2021dec214d0STahsin Erdogan iput(ea_inode); 2022dec214d0STahsin Erdogan ea_inode = NULL; 2023dec214d0STahsin Erdogan } 2024dec214d0STahsin Erdogan 2025ac27a0ecSDave Kleikamp lock_buffer(new_bh); 2026617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 2027ac27a0ecSDave Kleikamp if (error) { 2028ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2029860d21e2STheodore Ts'o error = -EIO; 2030ac27a0ecSDave Kleikamp goto getblk_failed; 2031ac27a0ecSDave Kleikamp } 2032ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 2033dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2034ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 2035ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 203647387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, new_bh); 2037dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, 2038dac7a4b4STheodore Ts'o new_bh); 2039ac27a0ecSDave Kleikamp if (error) 2040ac27a0ecSDave Kleikamp goto cleanup; 2041ac27a0ecSDave Kleikamp } 2042ac27a0ecSDave Kleikamp } 2043ac27a0ecSDave Kleikamp 2044dec214d0STahsin Erdogan if (old_ea_inode_size) 2045dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, old_ea_inode_size); 2046dec214d0STahsin Erdogan 2047ac27a0ecSDave Kleikamp /* Update the inode. */ 2048617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 2049ac27a0ecSDave Kleikamp 2050ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 2051dec214d0STahsin Erdogan if (bs->bh && bs->bh != new_bh) { 2052dec214d0STahsin Erdogan struct ext4_xattr_inode_array *ea_inode_array = NULL; 2053dec214d0STahsin Erdogan 2054dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bs->bh, 2055dec214d0STahsin Erdogan &ea_inode_array, 2056dec214d0STahsin Erdogan 0 /* extra_credits */); 2057dec214d0STahsin Erdogan ext4_xattr_inode_array_free(ea_inode_array); 2058dec214d0STahsin Erdogan } 2059ac27a0ecSDave Kleikamp error = 0; 2060ac27a0ecSDave Kleikamp 2061ac27a0ecSDave Kleikamp cleanup: 2062dec214d0STahsin Erdogan if (ea_inode) { 2063dec214d0STahsin Erdogan int error2; 2064dec214d0STahsin Erdogan 2065dec214d0STahsin Erdogan error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); 2066dec214d0STahsin Erdogan if (error2) 2067dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "dec ref error=%d", 2068dec214d0STahsin Erdogan error2); 2069dec214d0STahsin Erdogan 2070dec214d0STahsin Erdogan /* If there was an error, revert the quota charge. */ 2071dec214d0STahsin Erdogan if (error) 2072dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 2073dec214d0STahsin Erdogan i_size_read(ea_inode)); 2074dec214d0STahsin Erdogan iput(ea_inode); 2075dec214d0STahsin Erdogan } 2076ac27a0ecSDave Kleikamp if (ce) 207747387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2078ac27a0ecSDave Kleikamp brelse(new_bh); 2079ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 2080ac27a0ecSDave Kleikamp kfree(s->base); 2081ac27a0ecSDave Kleikamp 2082ac27a0ecSDave Kleikamp return error; 2083ac27a0ecSDave Kleikamp 2084ac27a0ecSDave Kleikamp cleanup_dquot: 20851231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 2086ac27a0ecSDave Kleikamp goto cleanup; 2087ac27a0ecSDave Kleikamp 2088ac27a0ecSDave Kleikamp bad_block: 208924676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 209024676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2091ac27a0ecSDave Kleikamp goto cleanup; 2092ac27a0ecSDave Kleikamp 2093ac27a0ecSDave Kleikamp #undef header 2094ac27a0ecSDave Kleikamp } 2095ac27a0ecSDave Kleikamp 2096879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 2097617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2098ac27a0ecSDave Kleikamp { 2099617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2100617ba13bSMingming Cao struct ext4_inode *raw_inode; 2101ac27a0ecSDave Kleikamp int error; 2102ac27a0ecSDave Kleikamp 2103617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 2104ac27a0ecSDave Kleikamp return 0; 2105617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 2106ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 2107ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 2108ac27a0ecSDave Kleikamp is->s.here = is->s.first; 2109617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 211019f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 21119e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 2112ac27a0ecSDave Kleikamp if (error) 2113ac27a0ecSDave Kleikamp return error; 2114ac27a0ecSDave Kleikamp /* Find the named attribute. */ 2115617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 21166ba644b9SEric Biggers i->name, 0); 2117ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 2118ac27a0ecSDave Kleikamp return error; 2119ac27a0ecSDave Kleikamp is->s.not_found = error; 2120ac27a0ecSDave Kleikamp } 2121ac27a0ecSDave Kleikamp return 0; 2122ac27a0ecSDave Kleikamp } 2123ac27a0ecSDave Kleikamp 21240d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 21250d812f77STao Ma struct ext4_xattr_info *i, 21260d812f77STao Ma struct ext4_xattr_ibody_find *is) 21270d812f77STao Ma { 21280d812f77STao Ma struct ext4_xattr_ibody_header *header; 21290d812f77STao Ma struct ext4_xattr_search *s = &is->s; 21300d812f77STao Ma int error; 21310d812f77STao Ma 21320d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 21330d812f77STao Ma return -ENOSPC; 2134daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 21350d812f77STao Ma if (error) { 21360d812f77STao Ma if (error == -ENOSPC && 21370d812f77STao Ma ext4_has_inline_data(inode)) { 21380d812f77STao Ma error = ext4_try_to_evict_inline_data(handle, inode, 21390d812f77STao Ma EXT4_XATTR_LEN(strlen(i->name) + 21400d812f77STao Ma EXT4_XATTR_SIZE(i->value_len))); 21410d812f77STao Ma if (error) 21420d812f77STao Ma return error; 21430d812f77STao Ma error = ext4_xattr_ibody_find(inode, i, is); 21440d812f77STao Ma if (error) 21450d812f77STao Ma return error; 2146daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 2147daf83281STahsin Erdogan false /* is_block */); 21480d812f77STao Ma } 21490d812f77STao Ma if (error) 21500d812f77STao Ma return error; 21510d812f77STao Ma } 21520d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 21530d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 21540d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 21550d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 21560d812f77STao Ma } else { 21570d812f77STao Ma header->h_magic = cpu_to_le32(0); 21580d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 21590d812f77STao Ma } 21600d812f77STao Ma return 0; 21610d812f77STao Ma } 21620d812f77STao Ma 2163e50e5129SAndreas Dilger static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 2164617ba13bSMingming Cao struct ext4_xattr_info *i, 2165617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2166ac27a0ecSDave Kleikamp { 2167617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2168617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 2169ac27a0ecSDave Kleikamp int error; 2170ac27a0ecSDave Kleikamp 2171617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 2172ac27a0ecSDave Kleikamp return -ENOSPC; 2173daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 2174ac27a0ecSDave Kleikamp if (error) 2175ac27a0ecSDave Kleikamp return error; 2176617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 2177ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 2178617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 217919f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 2180ac27a0ecSDave Kleikamp } else { 2181ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 218219f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 2183ac27a0ecSDave Kleikamp } 2184ac27a0ecSDave Kleikamp return 0; 2185ac27a0ecSDave Kleikamp } 2186ac27a0ecSDave Kleikamp 21873fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 21883fd16462SJan Kara struct ext4_xattr_info *i) 21893fd16462SJan Kara { 21903fd16462SJan Kara void *value; 21913fd16462SJan Kara 21920bd454c0STahsin Erdogan /* When e_value_inum is set the value is stored externally. */ 21930bd454c0STahsin Erdogan if (s->here->e_value_inum) 21940bd454c0STahsin Erdogan return 0; 21953fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 21963fd16462SJan Kara return 0; 21973fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 21983fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 21993fd16462SJan Kara } 22003fd16462SJan Kara 2201dec214d0STahsin Erdogan static struct buffer_head *ext4_xattr_get_block(struct inode *inode) 2202dec214d0STahsin Erdogan { 2203dec214d0STahsin Erdogan struct buffer_head *bh; 2204dec214d0STahsin Erdogan int error; 2205dec214d0STahsin Erdogan 2206dec214d0STahsin Erdogan if (!EXT4_I(inode)->i_file_acl) 2207dec214d0STahsin Erdogan return NULL; 2208dec214d0STahsin Erdogan bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 2209dec214d0STahsin Erdogan if (!bh) 2210dec214d0STahsin Erdogan return ERR_PTR(-EIO); 2211dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2212dec214d0STahsin Erdogan if (error) 2213dec214d0STahsin Erdogan return ERR_PTR(error); 2214dec214d0STahsin Erdogan return bh; 2215dec214d0STahsin Erdogan } 2216dec214d0STahsin Erdogan 2217ac27a0ecSDave Kleikamp /* 2218617ba13bSMingming Cao * ext4_xattr_set_handle() 2219ac27a0ecSDave Kleikamp * 22206e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 2221ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 2222ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 2223ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 2224ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 2225ac27a0ecSDave Kleikamp * previous to the call, respectively. 2226ac27a0ecSDave Kleikamp * 2227ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2228ac27a0ecSDave Kleikamp */ 2229ac27a0ecSDave Kleikamp int 2230617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 2231ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 2232ac27a0ecSDave Kleikamp int flags) 2233ac27a0ecSDave Kleikamp { 2234617ba13bSMingming Cao struct ext4_xattr_info i = { 2235ac27a0ecSDave Kleikamp .name_index = name_index, 2236ac27a0ecSDave Kleikamp .name = name, 2237ac27a0ecSDave Kleikamp .value = value, 2238ac27a0ecSDave Kleikamp .value_len = value_len, 2239e50e5129SAndreas Dilger .in_inode = 0, 2240ac27a0ecSDave Kleikamp }; 2241617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 2242ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2243ac27a0ecSDave Kleikamp }; 2244617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 2245ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2246ac27a0ecSDave Kleikamp }; 2247c755e251STheodore Ts'o int no_expand; 2248ac27a0ecSDave Kleikamp int error; 2249ac27a0ecSDave Kleikamp 2250ac27a0ecSDave Kleikamp if (!name) 2251ac27a0ecSDave Kleikamp return -EINVAL; 2252ac27a0ecSDave Kleikamp if (strlen(name) > 255) 2253ac27a0ecSDave Kleikamp return -ERANGE; 2254b8cb5a54STahsin Erdogan 2255c755e251STheodore Ts'o ext4_write_lock_xattr(inode, &no_expand); 22564d20c685SKalpak Shah 2257c1a5d5f6STahsin Erdogan /* Check journal credits under write lock. */ 2258c1a5d5f6STahsin Erdogan if (ext4_handle_valid(handle)) { 2259dec214d0STahsin Erdogan struct buffer_head *bh; 2260c1a5d5f6STahsin Erdogan int credits; 2261c1a5d5f6STahsin Erdogan 2262dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2263dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2264dec214d0STahsin Erdogan error = PTR_ERR(bh); 2265dec214d0STahsin Erdogan goto cleanup; 2266dec214d0STahsin Erdogan } 2267dec214d0STahsin Erdogan 2268af65207cSTahsin Erdogan credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2269af65207cSTahsin Erdogan value_len, 2270af65207cSTahsin Erdogan flags & XATTR_CREATE); 2271dec214d0STahsin Erdogan brelse(bh); 2272dec214d0STahsin Erdogan 2273c1a5d5f6STahsin Erdogan if (!ext4_handle_has_enough_credits(handle, credits)) { 2274c1a5d5f6STahsin Erdogan error = -ENOSPC; 2275c1a5d5f6STahsin Erdogan goto cleanup; 2276c1a5d5f6STahsin Erdogan } 2277c1a5d5f6STahsin Erdogan } 2278c1a5d5f6STahsin Erdogan 227966543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 228086ebfd08SEric Sandeen if (error) 228186ebfd08SEric Sandeen goto cleanup; 228286ebfd08SEric Sandeen 228319f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 2284617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 2285617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 228619f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 2287ac27a0ecSDave Kleikamp } 2288ac27a0ecSDave Kleikamp 2289617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 2290ac27a0ecSDave Kleikamp if (error) 2291ac27a0ecSDave Kleikamp goto cleanup; 2292ac27a0ecSDave Kleikamp if (is.s.not_found) 2293617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 2294ac27a0ecSDave Kleikamp if (error) 2295ac27a0ecSDave Kleikamp goto cleanup; 2296ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 2297ac27a0ecSDave Kleikamp error = -ENODATA; 2298ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 2299ac27a0ecSDave Kleikamp goto cleanup; 2300ac27a0ecSDave Kleikamp error = 0; 2301ac27a0ecSDave Kleikamp if (!value) 2302ac27a0ecSDave Kleikamp goto cleanup; 2303ac27a0ecSDave Kleikamp } else { 2304ac27a0ecSDave Kleikamp error = -EEXIST; 2305ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 2306ac27a0ecSDave Kleikamp goto cleanup; 2307ac27a0ecSDave Kleikamp } 2308dec214d0STahsin Erdogan 2309ac27a0ecSDave Kleikamp if (!value) { 2310ac27a0ecSDave Kleikamp if (!is.s.not_found) 2311e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2312ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 2313617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2314ac27a0ecSDave Kleikamp } else { 23153fd16462SJan Kara error = 0; 23163fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 23173fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 23183fd16462SJan Kara goto cleanup; 23193fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 23203fd16462SJan Kara goto cleanup; 23213fd16462SJan Kara 2322b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2323b347e2bcSTahsin Erdogan (EXT4_XATTR_SIZE(i.value_len) > 2324b347e2bcSTahsin Erdogan EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) 2325b347e2bcSTahsin Erdogan i.in_inode = 1; 2326b347e2bcSTahsin Erdogan retry_inode: 2327e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2328ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 2329ac27a0ecSDave Kleikamp i.value = NULL; 2330617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2331ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 23327e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 23337e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 23347e01c8e5STiger Yang if (error) 23357e01c8e5STiger Yang goto cleanup; 23367e01c8e5STiger Yang } 2337617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2338b347e2bcSTahsin Erdogan if (!error && !is.s.not_found) { 2339ac27a0ecSDave Kleikamp i.value = NULL; 2340e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, 2341e50e5129SAndreas Dilger &is); 2342b347e2bcSTahsin Erdogan } else if (error == -ENOSPC) { 2343b347e2bcSTahsin Erdogan /* 2344b347e2bcSTahsin Erdogan * Xattr does not fit in the block, store at 2345b347e2bcSTahsin Erdogan * external inode if possible. 2346b347e2bcSTahsin Erdogan */ 2347b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2348b347e2bcSTahsin Erdogan !i.in_inode) { 2349b347e2bcSTahsin Erdogan i.in_inode = 1; 2350b347e2bcSTahsin Erdogan goto retry_inode; 2351b347e2bcSTahsin Erdogan } 2352ac27a0ecSDave Kleikamp } 2353ac27a0ecSDave Kleikamp } 2354ac27a0ecSDave Kleikamp } 2355ac27a0ecSDave Kleikamp if (!error) { 2356617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 2357eeca7ea1SDeepa Dinamani inode->i_ctime = current_time(inode); 23586dd4ee7cSKalpak Shah if (!value) 2359c755e251STheodore Ts'o no_expand = 0; 2360617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 2361ac27a0ecSDave Kleikamp /* 2362617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 2363ac27a0ecSDave Kleikamp * error != 0. 2364ac27a0ecSDave Kleikamp */ 2365ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 2366ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 23670390131bSFrank Mayhar ext4_handle_sync(handle); 2368ac27a0ecSDave Kleikamp } 2369ac27a0ecSDave Kleikamp 2370ac27a0ecSDave Kleikamp cleanup: 2371ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 2372ac27a0ecSDave Kleikamp brelse(bs.bh); 2373c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 2374ac27a0ecSDave Kleikamp return error; 2375ac27a0ecSDave Kleikamp } 2376ac27a0ecSDave Kleikamp 2377af65207cSTahsin Erdogan int ext4_xattr_set_credits(struct inode *inode, size_t value_len, 2378af65207cSTahsin Erdogan bool is_create, int *credits) 2379c1a5d5f6STahsin Erdogan { 2380dec214d0STahsin Erdogan struct buffer_head *bh; 2381dec214d0STahsin Erdogan int err; 2382c1a5d5f6STahsin Erdogan 2383dec214d0STahsin Erdogan *credits = 0; 2384dec214d0STahsin Erdogan 2385dec214d0STahsin Erdogan if (!EXT4_SB(inode->i_sb)->s_journal) 2386c1a5d5f6STahsin Erdogan return 0; 2387c1a5d5f6STahsin Erdogan 2388dec214d0STahsin Erdogan down_read(&EXT4_I(inode)->xattr_sem); 2389c1a5d5f6STahsin Erdogan 2390dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2391dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2392dec214d0STahsin Erdogan err = PTR_ERR(bh); 2393dec214d0STahsin Erdogan } else { 2394af65207cSTahsin Erdogan *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2395af65207cSTahsin Erdogan value_len, is_create); 2396dec214d0STahsin Erdogan brelse(bh); 2397dec214d0STahsin Erdogan err = 0; 2398c1a5d5f6STahsin Erdogan } 2399dec214d0STahsin Erdogan 2400dec214d0STahsin Erdogan up_read(&EXT4_I(inode)->xattr_sem); 2401dec214d0STahsin Erdogan return err; 2402c1a5d5f6STahsin Erdogan } 2403c1a5d5f6STahsin Erdogan 2404ac27a0ecSDave Kleikamp /* 2405617ba13bSMingming Cao * ext4_xattr_set() 2406ac27a0ecSDave Kleikamp * 2407617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 2408ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 2409ac27a0ecSDave Kleikamp * 2410ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2411ac27a0ecSDave Kleikamp */ 2412ac27a0ecSDave Kleikamp int 2413617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 2414ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 2415ac27a0ecSDave Kleikamp { 2416ac27a0ecSDave Kleikamp handle_t *handle; 2417e50e5129SAndreas Dilger struct super_block *sb = inode->i_sb; 2418ac27a0ecSDave Kleikamp int error, retries = 0; 2419c1a5d5f6STahsin Erdogan int credits; 2420ac27a0ecSDave Kleikamp 2421b8cb5a54STahsin Erdogan error = dquot_initialize(inode); 2422b8cb5a54STahsin Erdogan if (error) 2423b8cb5a54STahsin Erdogan return error; 2424e50e5129SAndreas Dilger 2425ac27a0ecSDave Kleikamp retry: 2426af65207cSTahsin Erdogan error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, 2427af65207cSTahsin Erdogan &credits); 2428dec214d0STahsin Erdogan if (error) 2429dec214d0STahsin Erdogan return error; 2430dec214d0STahsin Erdogan 24319924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 2432ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 2433ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 2434ac27a0ecSDave Kleikamp } else { 2435ac27a0ecSDave Kleikamp int error2; 2436ac27a0ecSDave Kleikamp 2437617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 2438ac27a0ecSDave Kleikamp value, value_len, flags); 2439617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 2440ac27a0ecSDave Kleikamp if (error == -ENOSPC && 2441e50e5129SAndreas Dilger ext4_should_retry_alloc(sb, &retries)) 2442ac27a0ecSDave Kleikamp goto retry; 2443ac27a0ecSDave Kleikamp if (error == 0) 2444ac27a0ecSDave Kleikamp error = error2; 2445ac27a0ecSDave Kleikamp } 2446ac27a0ecSDave Kleikamp 2447ac27a0ecSDave Kleikamp return error; 2448ac27a0ecSDave Kleikamp } 2449ac27a0ecSDave Kleikamp 2450ac27a0ecSDave Kleikamp /* 24516dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 24526dd4ee7cSKalpak Shah * i_extra_isize. 24536dd4ee7cSKalpak Shah */ 24546dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 24556dd4ee7cSKalpak Shah int value_offs_shift, void *to, 245694405713SJan Kara void *from, size_t n) 24576dd4ee7cSKalpak Shah { 24586dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 24596dd4ee7cSKalpak Shah int new_offs; 24606dd4ee7cSKalpak Shah 246194405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 246294405713SJan Kara BUG_ON(value_offs_shift > 0); 246394405713SJan Kara 24646dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 24656dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 2466e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 24676dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 24686dd4ee7cSKalpak Shah value_offs_shift; 24696dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 24706dd4ee7cSKalpak Shah } 24716dd4ee7cSKalpak Shah } 24726dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 24736dd4ee7cSKalpak Shah memmove(to, from, n); 24746dd4ee7cSKalpak Shah } 24756dd4ee7cSKalpak Shah 24766dd4ee7cSKalpak Shah /* 24773f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 24783f2571c1SJan Kara */ 24793f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 24803f2571c1SJan Kara struct ext4_inode *raw_inode, 24813f2571c1SJan Kara struct ext4_xattr_entry *entry) 24823f2571c1SJan Kara { 24833f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 24843f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 24853f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 2486f6109100STahsin Erdogan size_t value_size = le32_to_cpu(entry->e_value_size); 24873f2571c1SJan Kara struct ext4_xattr_info i = { 24883f2571c1SJan Kara .value = NULL, 24893f2571c1SJan Kara .value_len = 0, 24903f2571c1SJan Kara .name_index = entry->e_name_index, 2491f6109100STahsin Erdogan .in_inode = !!entry->e_value_inum, 24923f2571c1SJan Kara }; 24933f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 24943f2571c1SJan Kara int error; 24953f2571c1SJan Kara 24963f2571c1SJan Kara is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 24973f2571c1SJan Kara bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 24983f2571c1SJan Kara buffer = kmalloc(value_size, GFP_NOFS); 24993f2571c1SJan Kara b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 25003f2571c1SJan Kara if (!is || !bs || !buffer || !b_entry_name) { 25013f2571c1SJan Kara error = -ENOMEM; 25023f2571c1SJan Kara goto out; 25033f2571c1SJan Kara } 25043f2571c1SJan Kara 25053f2571c1SJan Kara is->s.not_found = -ENODATA; 25063f2571c1SJan Kara bs->s.not_found = -ENODATA; 25073f2571c1SJan Kara is->iloc.bh = NULL; 25083f2571c1SJan Kara bs->bh = NULL; 25093f2571c1SJan Kara 25103f2571c1SJan Kara /* Save the entry name and the entry value */ 2511f6109100STahsin Erdogan if (entry->e_value_inum) { 2512b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, value_size); 2513f6109100STahsin Erdogan if (error) 2514f6109100STahsin Erdogan goto out; 2515f6109100STahsin Erdogan } else { 2516f6109100STahsin Erdogan size_t value_offs = le16_to_cpu(entry->e_value_offs); 25173f2571c1SJan Kara memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); 2518f6109100STahsin Erdogan } 2519f6109100STahsin Erdogan 25203f2571c1SJan Kara memcpy(b_entry_name, entry->e_name, entry->e_name_len); 25213f2571c1SJan Kara b_entry_name[entry->e_name_len] = '\0'; 25223f2571c1SJan Kara i.name = b_entry_name; 25233f2571c1SJan Kara 25243f2571c1SJan Kara error = ext4_get_inode_loc(inode, &is->iloc); 25253f2571c1SJan Kara if (error) 25263f2571c1SJan Kara goto out; 25273f2571c1SJan Kara 25283f2571c1SJan Kara error = ext4_xattr_ibody_find(inode, &i, is); 25293f2571c1SJan Kara if (error) 25303f2571c1SJan Kara goto out; 25313f2571c1SJan Kara 25323f2571c1SJan Kara /* Remove the chosen entry from the inode */ 2533e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, is); 25343f2571c1SJan Kara if (error) 25353f2571c1SJan Kara goto out; 25363f2571c1SJan Kara 25373f2571c1SJan Kara i.value = buffer; 25383f2571c1SJan Kara i.value_len = value_size; 25393f2571c1SJan Kara error = ext4_xattr_block_find(inode, &i, bs); 25403f2571c1SJan Kara if (error) 25413f2571c1SJan Kara goto out; 25423f2571c1SJan Kara 25433f2571c1SJan Kara /* Add entry which was removed from the inode into the block */ 25443f2571c1SJan Kara error = ext4_xattr_block_set(handle, inode, &i, bs); 25453f2571c1SJan Kara if (error) 25463f2571c1SJan Kara goto out; 25473f2571c1SJan Kara error = 0; 25483f2571c1SJan Kara out: 25493f2571c1SJan Kara kfree(b_entry_name); 25503f2571c1SJan Kara kfree(buffer); 25513f2571c1SJan Kara if (is) 25523f2571c1SJan Kara brelse(is->iloc.bh); 25533f2571c1SJan Kara kfree(is); 25543f2571c1SJan Kara kfree(bs); 25553f2571c1SJan Kara 25563f2571c1SJan Kara return error; 25573f2571c1SJan Kara } 25583f2571c1SJan Kara 2559dfa2064bSJan Kara static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, 2560dfa2064bSJan Kara struct ext4_inode *raw_inode, 2561dfa2064bSJan Kara int isize_diff, size_t ifree, 2562dfa2064bSJan Kara size_t bfree, int *total_ino) 2563dfa2064bSJan Kara { 2564dfa2064bSJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 2565dfa2064bSJan Kara struct ext4_xattr_entry *small_entry; 2566dfa2064bSJan Kara struct ext4_xattr_entry *entry; 2567dfa2064bSJan Kara struct ext4_xattr_entry *last; 2568dfa2064bSJan Kara unsigned int entry_size; /* EA entry size */ 2569dfa2064bSJan Kara unsigned int total_size; /* EA entry size + value size */ 2570dfa2064bSJan Kara unsigned int min_total_size; 2571dfa2064bSJan Kara int error; 2572dfa2064bSJan Kara 2573dfa2064bSJan Kara while (isize_diff > ifree) { 2574dfa2064bSJan Kara entry = NULL; 2575dfa2064bSJan Kara small_entry = NULL; 2576dfa2064bSJan Kara min_total_size = ~0U; 2577dfa2064bSJan Kara last = IFIRST(header); 2578dfa2064bSJan Kara /* Find the entry best suited to be pushed into EA block */ 2579dfa2064bSJan Kara for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 25809bb21cedSTahsin Erdogan total_size = EXT4_XATTR_LEN(last->e_name_len); 25819bb21cedSTahsin Erdogan if (!last->e_value_inum) 25829bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 25839bb21cedSTahsin Erdogan le32_to_cpu(last->e_value_size)); 2584dfa2064bSJan Kara if (total_size <= bfree && 2585dfa2064bSJan Kara total_size < min_total_size) { 2586dfa2064bSJan Kara if (total_size + ifree < isize_diff) { 2587dfa2064bSJan Kara small_entry = last; 2588dfa2064bSJan Kara } else { 2589dfa2064bSJan Kara entry = last; 2590dfa2064bSJan Kara min_total_size = total_size; 2591dfa2064bSJan Kara } 2592dfa2064bSJan Kara } 2593dfa2064bSJan Kara } 2594dfa2064bSJan Kara 2595dfa2064bSJan Kara if (entry == NULL) { 2596dfa2064bSJan Kara if (small_entry == NULL) 2597dfa2064bSJan Kara return -ENOSPC; 2598dfa2064bSJan Kara entry = small_entry; 2599dfa2064bSJan Kara } 2600dfa2064bSJan Kara 2601dfa2064bSJan Kara entry_size = EXT4_XATTR_LEN(entry->e_name_len); 26029bb21cedSTahsin Erdogan total_size = entry_size; 26039bb21cedSTahsin Erdogan if (!entry->e_value_inum) 26049bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 26059bb21cedSTahsin Erdogan le32_to_cpu(entry->e_value_size)); 2606dfa2064bSJan Kara error = ext4_xattr_move_to_block(handle, inode, raw_inode, 2607dfa2064bSJan Kara entry); 2608dfa2064bSJan Kara if (error) 2609dfa2064bSJan Kara return error; 2610dfa2064bSJan Kara 2611dfa2064bSJan Kara *total_ino -= entry_size; 2612dfa2064bSJan Kara ifree += total_size; 2613dfa2064bSJan Kara bfree -= total_size; 2614dfa2064bSJan Kara } 2615dfa2064bSJan Kara 2616dfa2064bSJan Kara return 0; 2617dfa2064bSJan Kara } 2618dfa2064bSJan Kara 26193f2571c1SJan Kara /* 26206dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 26216dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 26226dd4ee7cSKalpak Shah */ 26236dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 26246dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 26256dd4ee7cSKalpak Shah { 26266dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 26276dd4ee7cSKalpak Shah struct buffer_head *bh = NULL; 2628e3014d14SJan Kara size_t min_offs; 2629e3014d14SJan Kara size_t ifree, bfree; 26307b1b2c1bSTheodore Ts'o int total_ino; 26316e0cd088SJan Kara void *base, *end; 2632d0141191SJan Kara int error = 0, tried_min_extra_isize = 0; 2633ac39849dSAneesh Kumar K.V int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize); 2634d0141191SJan Kara int isize_diff; /* How much do we need to grow i_extra_isize */ 2635c755e251STheodore Ts'o int no_expand; 26366dd4ee7cSKalpak Shah 2637c755e251STheodore Ts'o if (ext4_write_trylock_xattr(inode, &no_expand) == 0) 2638c755e251STheodore Ts'o return 0; 2639c755e251STheodore Ts'o 26406dd4ee7cSKalpak Shah retry: 2641d0141191SJan Kara isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; 26422e81a4eeSJan Kara if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) 26432e81a4eeSJan Kara goto out; 26446dd4ee7cSKalpak Shah 26456dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 26466dd4ee7cSKalpak Shah 26476dd4ee7cSKalpak Shah /* 26486dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 26496dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 26506dd4ee7cSKalpak Shah */ 26516dd4ee7cSKalpak Shah 26526e0cd088SJan Kara base = IFIRST(header); 26536dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 26546dd4ee7cSKalpak Shah min_offs = end - base; 26556dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 26566dd4ee7cSKalpak Shah 26579e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 26589e92f48cSTheodore Ts'o if (error) 26599e92f48cSTheodore Ts'o goto cleanup; 26609e92f48cSTheodore Ts'o 26616e0cd088SJan Kara ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); 2662e3014d14SJan Kara if (ifree >= isize_diff) 2663e3014d14SJan Kara goto shift; 26646dd4ee7cSKalpak Shah 26656dd4ee7cSKalpak Shah /* 26666dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 26676dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 26686dd4ee7cSKalpak Shah */ 26696dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 26706dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 26716dd4ee7cSKalpak Shah error = -EIO; 26726dd4ee7cSKalpak Shah if (!bh) 26736dd4ee7cSKalpak Shah goto cleanup; 2674cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 267524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 267624676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 26776a797d27SDarrick J. Wong error = -EFSCORRUPTED; 26786dd4ee7cSKalpak Shah goto cleanup; 26796dd4ee7cSKalpak Shah } 26806dd4ee7cSKalpak Shah base = BHDR(bh); 26816dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 26826dd4ee7cSKalpak Shah min_offs = end - base; 26836e0cd088SJan Kara bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, 26846e0cd088SJan Kara NULL); 2685e3014d14SJan Kara if (bfree + ifree < isize_diff) { 26866dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 26876dd4ee7cSKalpak Shah tried_min_extra_isize++; 26886dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 26896dd4ee7cSKalpak Shah brelse(bh); 26906dd4ee7cSKalpak Shah goto retry; 26916dd4ee7cSKalpak Shah } 2692dfa2064bSJan Kara error = -ENOSPC; 26936dd4ee7cSKalpak Shah goto cleanup; 26946dd4ee7cSKalpak Shah } 26956dd4ee7cSKalpak Shah } else { 2696e3014d14SJan Kara bfree = inode->i_sb->s_blocksize; 26976dd4ee7cSKalpak Shah } 26986dd4ee7cSKalpak Shah 2699dfa2064bSJan Kara error = ext4_xattr_make_inode_space(handle, inode, raw_inode, 2700dfa2064bSJan Kara isize_diff, ifree, bfree, 2701dfa2064bSJan Kara &total_ino); 2702dfa2064bSJan Kara if (error) { 2703dfa2064bSJan Kara if (error == -ENOSPC && !tried_min_extra_isize && 27046dd4ee7cSKalpak Shah s_min_extra_isize) { 27056dd4ee7cSKalpak Shah tried_min_extra_isize++; 27066dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 2707dcb9917bSTheodore Ts'o brelse(bh); 27086dd4ee7cSKalpak Shah goto retry; 27096dd4ee7cSKalpak Shah } 27106dd4ee7cSKalpak Shah goto cleanup; 27116dd4ee7cSKalpak Shah } 2712e3014d14SJan Kara shift: 2713e3014d14SJan Kara /* Adjust the offsets and shift the remaining entries ahead */ 27146e0cd088SJan Kara ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize 2715e3014d14SJan Kara - new_extra_isize, (void *)raw_inode + 2716e3014d14SJan Kara EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 271794405713SJan Kara (void *)header, total_ino); 2718e3014d14SJan Kara EXT4_I(inode)->i_extra_isize = new_extra_isize; 27196dd4ee7cSKalpak Shah brelse(bh); 27202e81a4eeSJan Kara out: 2721c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 27226dd4ee7cSKalpak Shah return 0; 27236dd4ee7cSKalpak Shah 27246dd4ee7cSKalpak Shah cleanup: 27256dd4ee7cSKalpak Shah brelse(bh); 27262e81a4eeSJan Kara /* 2727c755e251STheodore Ts'o * Inode size expansion failed; don't try again 27282e81a4eeSJan Kara */ 2729c755e251STheodore Ts'o no_expand = 1; 2730c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 27316dd4ee7cSKalpak Shah return error; 27326dd4ee7cSKalpak Shah } 27336dd4ee7cSKalpak Shah 2734e50e5129SAndreas Dilger #define EIA_INCR 16 /* must be 2^n */ 2735e50e5129SAndreas Dilger #define EIA_MASK (EIA_INCR - 1) 2736dec214d0STahsin Erdogan 2737dec214d0STahsin Erdogan /* Add the large xattr @inode into @ea_inode_array for deferred iput(). 27380421a189STahsin Erdogan * If @ea_inode_array is new or full it will be grown and the old 2739e50e5129SAndreas Dilger * contents copied over. 2740e50e5129SAndreas Dilger */ 2741e50e5129SAndreas Dilger static int 27420421a189STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 27430421a189STahsin Erdogan struct inode *inode) 2744e50e5129SAndreas Dilger { 27450421a189STahsin Erdogan if (*ea_inode_array == NULL) { 2746e50e5129SAndreas Dilger /* 2747e50e5129SAndreas Dilger * Start with 15 inodes, so it fits into a power-of-two size. 27480421a189STahsin Erdogan * If *ea_inode_array is NULL, this is essentially offsetof() 2749e50e5129SAndreas Dilger */ 27500421a189STahsin Erdogan (*ea_inode_array) = 27510421a189STahsin Erdogan kmalloc(offsetof(struct ext4_xattr_inode_array, 27520421a189STahsin Erdogan inodes[EIA_MASK]), 2753e50e5129SAndreas Dilger GFP_NOFS); 27540421a189STahsin Erdogan if (*ea_inode_array == NULL) 2755e50e5129SAndreas Dilger return -ENOMEM; 27560421a189STahsin Erdogan (*ea_inode_array)->count = 0; 27570421a189STahsin Erdogan } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { 2758e50e5129SAndreas Dilger /* expand the array once all 15 + n * 16 slots are full */ 27590421a189STahsin Erdogan struct ext4_xattr_inode_array *new_array = NULL; 27600421a189STahsin Erdogan int count = (*ea_inode_array)->count; 2761e50e5129SAndreas Dilger 2762e50e5129SAndreas Dilger /* if new_array is NULL, this is essentially offsetof() */ 2763e50e5129SAndreas Dilger new_array = kmalloc( 27640421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, 27650421a189STahsin Erdogan inodes[count + EIA_INCR]), 2766e50e5129SAndreas Dilger GFP_NOFS); 2767e50e5129SAndreas Dilger if (new_array == NULL) 2768e50e5129SAndreas Dilger return -ENOMEM; 27690421a189STahsin Erdogan memcpy(new_array, *ea_inode_array, 27700421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, inodes[count])); 27710421a189STahsin Erdogan kfree(*ea_inode_array); 27720421a189STahsin Erdogan *ea_inode_array = new_array; 2773e50e5129SAndreas Dilger } 27740421a189STahsin Erdogan (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; 2775e50e5129SAndreas Dilger return 0; 2776e50e5129SAndreas Dilger } 2777e50e5129SAndreas Dilger 27786dd4ee7cSKalpak Shah /* 2779617ba13bSMingming Cao * ext4_xattr_delete_inode() 2780ac27a0ecSDave Kleikamp * 2781e50e5129SAndreas Dilger * Free extended attribute resources associated with this inode. Traverse 2782dec214d0STahsin Erdogan * all entries and decrement reference on any xattr inodes associated with this 2783dec214d0STahsin Erdogan * inode. This is called immediately before an inode is freed. We have exclusive 2784dec214d0STahsin Erdogan * access to the inode. If an orphan inode is deleted it will also release its 2785dec214d0STahsin Erdogan * references on xattr block and xattr inodes. 2786ac27a0ecSDave Kleikamp */ 2787dec214d0STahsin Erdogan int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, 278830a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 278930a7eb97STahsin Erdogan int extra_credits) 2790ac27a0ecSDave Kleikamp { 2791ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 2792e50e5129SAndreas Dilger struct ext4_xattr_ibody_header *header; 279330a7eb97STahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 2794dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 279530a7eb97STahsin Erdogan int error; 279630a7eb97STahsin Erdogan 279730a7eb97STahsin Erdogan error = ext4_xattr_ensure_credits(handle, inode, extra_credits, 279830a7eb97STahsin Erdogan NULL /* bh */, 279930a7eb97STahsin Erdogan false /* dirty */, 280030a7eb97STahsin Erdogan false /* block_csum */); 280130a7eb97STahsin Erdogan if (error) { 280230a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); 280330a7eb97STahsin Erdogan goto cleanup; 280430a7eb97STahsin Erdogan } 2805ac27a0ecSDave Kleikamp 2806dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2807dec214d0STahsin Erdogan ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 2808e50e5129SAndreas Dilger 2809e50e5129SAndreas Dilger error = ext4_get_inode_loc(inode, &iloc); 2810dec214d0STahsin Erdogan if (error) { 2811dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); 2812e50e5129SAndreas Dilger goto cleanup; 2813e50e5129SAndreas Dilger } 2814dec214d0STahsin Erdogan 2815dec214d0STahsin Erdogan error = ext4_journal_get_write_access(handle, iloc.bh); 2816dec214d0STahsin Erdogan if (error) { 2817dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "write access (error %d)", 2818dec214d0STahsin Erdogan error); 2819dec214d0STahsin Erdogan goto cleanup; 2820dec214d0STahsin Erdogan } 2821dec214d0STahsin Erdogan 2822dec214d0STahsin Erdogan header = IHDR(inode, ext4_raw_inode(&iloc)); 2823dec214d0STahsin Erdogan if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) 2824dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, 2825dec214d0STahsin Erdogan IFIRST(header), 2826dec214d0STahsin Erdogan false /* block_csum */, 2827dec214d0STahsin Erdogan ea_inode_array, 2828dec214d0STahsin Erdogan extra_credits, 2829dec214d0STahsin Erdogan false /* skip_quota */); 2830dec214d0STahsin Erdogan } 2831dec214d0STahsin Erdogan 2832dec214d0STahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 2833617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 2834ac27a0ecSDave Kleikamp if (!bh) { 283524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 283624676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 283765d30005STahsin Erdogan error = -EIO; 2838ac27a0ecSDave Kleikamp goto cleanup; 2839ac27a0ecSDave Kleikamp } 2840dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2841dec214d0STahsin Erdogan if (error) { 2842dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "bad block %llu (error %d)", 2843dec214d0STahsin Erdogan EXT4_I(inode)->i_file_acl, error); 2844ac27a0ecSDave Kleikamp goto cleanup; 2845ac27a0ecSDave Kleikamp } 2846e50e5129SAndreas Dilger 284730a7eb97STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) { 2848dec214d0STahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 2849dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 2850dec214d0STahsin Erdogan if (entry->e_value_inum) 2851dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 2852dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 2853dec214d0STahsin Erdogan 2854e50e5129SAndreas Dilger } 2855e50e5129SAndreas Dilger 2856dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bh, ea_inode_array, 2857dec214d0STahsin Erdogan extra_credits); 2858dec214d0STahsin Erdogan /* 2859dec214d0STahsin Erdogan * Update i_file_acl value in the same transaction that releases 2860dec214d0STahsin Erdogan * block. 2861dec214d0STahsin Erdogan */ 2862617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 286330a7eb97STahsin Erdogan error = ext4_mark_inode_dirty(handle, inode); 286430a7eb97STahsin Erdogan if (error) { 286530a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", 286630a7eb97STahsin Erdogan error); 286730a7eb97STahsin Erdogan goto cleanup; 286830a7eb97STahsin Erdogan } 2869dec214d0STahsin Erdogan } 2870dec214d0STahsin Erdogan error = 0; 2871ac27a0ecSDave Kleikamp cleanup: 287230a7eb97STahsin Erdogan brelse(iloc.bh); 2873ac27a0ecSDave Kleikamp brelse(bh); 2874e50e5129SAndreas Dilger return error; 2875e50e5129SAndreas Dilger } 2876e50e5129SAndreas Dilger 28770421a189STahsin Erdogan void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) 2878e50e5129SAndreas Dilger { 2879dec214d0STahsin Erdogan int idx; 2880e50e5129SAndreas Dilger 28810421a189STahsin Erdogan if (ea_inode_array == NULL) 2882e50e5129SAndreas Dilger return; 2883e50e5129SAndreas Dilger 2884dec214d0STahsin Erdogan for (idx = 0; idx < ea_inode_array->count; ++idx) 2885dec214d0STahsin Erdogan iput(ea_inode_array->inodes[idx]); 28860421a189STahsin Erdogan kfree(ea_inode_array); 2887ac27a0ecSDave Kleikamp } 2888ac27a0ecSDave Kleikamp 2889ac27a0ecSDave Kleikamp /* 289047387409STahsin Erdogan * ext4_xattr_block_cache_insert() 2891ac27a0ecSDave Kleikamp * 289247387409STahsin Erdogan * Create a new entry in the extended attribute block cache, and insert 2893ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 2894ac27a0ecSDave Kleikamp * 2895ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2896ac27a0ecSDave Kleikamp */ 2897ac27a0ecSDave Kleikamp static void 289847387409STahsin Erdogan ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, 289947387409STahsin Erdogan struct buffer_head *bh) 2900ac27a0ecSDave Kleikamp { 29016048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 29026048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 29036048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 29046048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 2905ac27a0ecSDave Kleikamp int error; 2906ac27a0ecSDave Kleikamp 2907cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 2908cdb7ee4cSTahsin Erdogan return; 290947387409STahsin Erdogan error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, 29106048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 2911ac27a0ecSDave Kleikamp if (error) { 291282939d79SJan Kara if (error == -EBUSY) 2913ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 291482939d79SJan Kara } else 2915ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 2916ac27a0ecSDave Kleikamp } 2917ac27a0ecSDave Kleikamp 2918ac27a0ecSDave Kleikamp /* 2919617ba13bSMingming Cao * ext4_xattr_cmp() 2920ac27a0ecSDave Kleikamp * 2921ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 2922ac27a0ecSDave Kleikamp * 2923ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 2924ac27a0ecSDave Kleikamp * a negative error number on errors. 2925ac27a0ecSDave Kleikamp */ 2926ac27a0ecSDave Kleikamp static int 2927617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 2928617ba13bSMingming Cao struct ext4_xattr_header *header2) 2929ac27a0ecSDave Kleikamp { 2930617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 2931ac27a0ecSDave Kleikamp 2932ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 2933ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 2934ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 2935ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 2936ac27a0ecSDave Kleikamp return 1; 2937ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 2938ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 2939ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 2940ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 2941e50e5129SAndreas Dilger entry1->e_value_inum != entry2->e_value_inum || 2942ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 2943ac27a0ecSDave Kleikamp return 1; 29447cec1918STahsin Erdogan if (!entry1->e_value_inum && 29457cec1918STahsin Erdogan memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 2946ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 2947ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 2948ac27a0ecSDave Kleikamp return 1; 2949ac27a0ecSDave Kleikamp 2950617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 2951617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 2952ac27a0ecSDave Kleikamp } 2953ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 2954ac27a0ecSDave Kleikamp return 1; 2955ac27a0ecSDave Kleikamp return 0; 2956ac27a0ecSDave Kleikamp } 2957ac27a0ecSDave Kleikamp 2958ac27a0ecSDave Kleikamp /* 295947387409STahsin Erdogan * ext4_xattr_block_cache_find() 2960ac27a0ecSDave Kleikamp * 2961ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 2962ac27a0ecSDave Kleikamp * 2963ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 2964ac27a0ecSDave Kleikamp * not found or an error occurred. 2965ac27a0ecSDave Kleikamp */ 2966ac27a0ecSDave Kleikamp static struct buffer_head * 296747387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *inode, 296847387409STahsin Erdogan struct ext4_xattr_header *header, 29697a2508e1SJan Kara struct mb_cache_entry **pce) 2970ac27a0ecSDave Kleikamp { 2971ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 29727a2508e1SJan Kara struct mb_cache_entry *ce; 297347387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 2974ac27a0ecSDave Kleikamp 2975cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 2976cdb7ee4cSTahsin Erdogan return NULL; 2977ac27a0ecSDave Kleikamp if (!header->h_hash) 2978ac27a0ecSDave Kleikamp return NULL; /* never share */ 2979ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 298047387409STahsin Erdogan ce = mb_cache_entry_find_first(ea_block_cache, hash); 2981ac27a0ecSDave Kleikamp while (ce) { 2982ac27a0ecSDave Kleikamp struct buffer_head *bh; 2983ac27a0ecSDave Kleikamp 2984c07dfcb4STahsin Erdogan bh = sb_bread(inode->i_sb, ce->e_value); 2985ac27a0ecSDave Kleikamp if (!bh) { 298624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 2987c07dfcb4STahsin Erdogan (unsigned long)ce->e_value); 2988617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 2989ac27a0ecSDave Kleikamp *pce = ce; 2990ac27a0ecSDave Kleikamp return bh; 2991ac27a0ecSDave Kleikamp } 2992ac27a0ecSDave Kleikamp brelse(bh); 299347387409STahsin Erdogan ce = mb_cache_entry_find_next(ea_block_cache, ce); 2994ac27a0ecSDave Kleikamp } 2995ac27a0ecSDave Kleikamp return NULL; 2996ac27a0ecSDave Kleikamp } 2997ac27a0ecSDave Kleikamp 2998ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 2999ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 3000ac27a0ecSDave Kleikamp 3001ac27a0ecSDave Kleikamp /* 3002617ba13bSMingming Cao * ext4_xattr_hash_entry() 3003ac27a0ecSDave Kleikamp * 3004ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 3005ac27a0ecSDave Kleikamp */ 3006b9fc761eSTahsin Erdogan static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, 3007b9fc761eSTahsin Erdogan size_t value_count) 3008ac27a0ecSDave Kleikamp { 3009ac27a0ecSDave Kleikamp __u32 hash = 0; 3010ac27a0ecSDave Kleikamp 3011b9fc761eSTahsin Erdogan while (name_len--) { 3012ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 3013ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 3014ac27a0ecSDave Kleikamp *name++; 3015ac27a0ecSDave Kleikamp } 3016b9fc761eSTahsin Erdogan while (value_count--) { 3017ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 3018ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 3019ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 3020ac27a0ecSDave Kleikamp } 3021b9fc761eSTahsin Erdogan return cpu_to_le32(hash); 3022ac27a0ecSDave Kleikamp } 3023ac27a0ecSDave Kleikamp 3024ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 3025ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 3026ac27a0ecSDave Kleikamp 3027ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 3028ac27a0ecSDave Kleikamp 3029ac27a0ecSDave Kleikamp /* 3030617ba13bSMingming Cao * ext4_xattr_rehash() 3031ac27a0ecSDave Kleikamp * 3032ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 3033ac27a0ecSDave Kleikamp */ 3034daf83281STahsin Erdogan static void ext4_xattr_rehash(struct ext4_xattr_header *header) 3035ac27a0ecSDave Kleikamp { 3036617ba13bSMingming Cao struct ext4_xattr_entry *here; 3037ac27a0ecSDave Kleikamp __u32 hash = 0; 3038ac27a0ecSDave Kleikamp 3039ac27a0ecSDave Kleikamp here = ENTRY(header+1); 3040ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 3041ac27a0ecSDave Kleikamp if (!here->e_hash) { 3042ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 3043ac27a0ecSDave Kleikamp hash = 0; 3044ac27a0ecSDave Kleikamp break; 3045ac27a0ecSDave Kleikamp } 3046ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 3047ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 3048ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 3049617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 3050ac27a0ecSDave Kleikamp } 3051ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 3052ac27a0ecSDave Kleikamp } 3053ac27a0ecSDave Kleikamp 3054ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 3055ac27a0ecSDave Kleikamp 30569c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 30579c191f70ST Makphaibulchoke 30587a2508e1SJan Kara struct mb_cache * 305982939d79SJan Kara ext4_xattr_create_cache(void) 3060ac27a0ecSDave Kleikamp { 30617a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 3062ac27a0ecSDave Kleikamp } 3063ac27a0ecSDave Kleikamp 30647a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 3065ac27a0ecSDave Kleikamp { 30669c191f70ST Makphaibulchoke if (cache) 30677a2508e1SJan Kara mb_cache_destroy(cache); 3068ac27a0ecSDave Kleikamp } 30699c191f70ST Makphaibulchoke 3070