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 { 3209699d4f9STahsin Erdogan int blocksize = 1 << ea_inode->i_blkbits; 3219699d4f9STahsin Erdogan int bh_count = (size + blocksize - 1) >> ea_inode->i_blkbits; 3229699d4f9STahsin Erdogan int tail_size = (size % blocksize) ?: blocksize; 3239699d4f9STahsin Erdogan struct buffer_head *bhs_inline[8]; 3249699d4f9STahsin Erdogan struct buffer_head **bhs = bhs_inline; 3259699d4f9STahsin Erdogan int i, ret; 326e50e5129SAndreas Dilger 3279699d4f9STahsin Erdogan if (bh_count > ARRAY_SIZE(bhs_inline)) { 3289699d4f9STahsin Erdogan bhs = kmalloc_array(bh_count, sizeof(*bhs), GFP_NOFS); 3299699d4f9STahsin Erdogan if (!bhs) 3309699d4f9STahsin Erdogan return -ENOMEM; 331e50e5129SAndreas Dilger } 3329699d4f9STahsin Erdogan 3339699d4f9STahsin Erdogan ret = ext4_bread_batch(ea_inode, 0 /* block */, bh_count, 3349699d4f9STahsin Erdogan true /* wait */, bhs); 3359699d4f9STahsin Erdogan if (ret) 3369699d4f9STahsin Erdogan goto free_bhs; 3379699d4f9STahsin Erdogan 3389699d4f9STahsin Erdogan for (i = 0; i < bh_count; i++) { 3399699d4f9STahsin Erdogan /* There shouldn't be any holes in ea_inode. */ 3409699d4f9STahsin Erdogan if (!bhs[i]) { 3419699d4f9STahsin Erdogan ret = -EFSCORRUPTED; 3429699d4f9STahsin Erdogan goto put_bhs; 3439699d4f9STahsin Erdogan } 3449699d4f9STahsin Erdogan memcpy((char *)buf + blocksize * i, bhs[i]->b_data, 3459699d4f9STahsin Erdogan i < bh_count - 1 ? blocksize : tail_size); 3469699d4f9STahsin Erdogan } 3479699d4f9STahsin Erdogan ret = 0; 3489699d4f9STahsin Erdogan put_bhs: 3499699d4f9STahsin Erdogan for (i = 0; i < bh_count; i++) 3509699d4f9STahsin Erdogan brelse(bhs[i]); 3519699d4f9STahsin Erdogan free_bhs: 3529699d4f9STahsin Erdogan if (bhs != bhs_inline) 3539699d4f9STahsin Erdogan kfree(bhs); 3549699d4f9STahsin Erdogan return ret; 355e50e5129SAndreas Dilger } 356e50e5129SAndreas Dilger 357bab79b04STahsin Erdogan static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, 358bab79b04STahsin Erdogan struct inode **ea_inode) 359e50e5129SAndreas Dilger { 360bab79b04STahsin Erdogan struct inode *inode; 361bab79b04STahsin Erdogan int err; 362e50e5129SAndreas Dilger 363bab79b04STahsin Erdogan inode = ext4_iget(parent->i_sb, ea_ino); 364bab79b04STahsin Erdogan if (IS_ERR(inode)) { 365bab79b04STahsin Erdogan err = PTR_ERR(inode); 366dec214d0STahsin Erdogan ext4_error(parent->i_sb, 367dec214d0STahsin Erdogan "error while reading EA inode %lu err=%d", ea_ino, 368dec214d0STahsin Erdogan err); 369bab79b04STahsin Erdogan return err; 370e50e5129SAndreas Dilger } 371e50e5129SAndreas Dilger 372bab79b04STahsin Erdogan if (is_bad_inode(inode)) { 373dec214d0STahsin Erdogan ext4_error(parent->i_sb, 374dec214d0STahsin Erdogan "error while reading EA inode %lu is_bad_inode", 375dec214d0STahsin Erdogan ea_ino); 376bab79b04STahsin Erdogan err = -EIO; 377e50e5129SAndreas Dilger goto error; 378e50e5129SAndreas Dilger } 379e50e5129SAndreas Dilger 380bab79b04STahsin Erdogan if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) { 381dec214d0STahsin Erdogan ext4_error(parent->i_sb, 382dec214d0STahsin Erdogan "EA inode %lu does not have EXT4_EA_INODE_FL flag", 383dec214d0STahsin Erdogan ea_ino); 384bab79b04STahsin Erdogan err = -EINVAL; 385e50e5129SAndreas Dilger goto error; 386e50e5129SAndreas Dilger } 387e50e5129SAndreas Dilger 388bab79b04STahsin Erdogan *ea_inode = inode; 389bab79b04STahsin Erdogan return 0; 390e50e5129SAndreas Dilger error: 391bab79b04STahsin Erdogan iput(inode); 392bab79b04STahsin Erdogan return err; 393e50e5129SAndreas Dilger } 394e50e5129SAndreas Dilger 395dec214d0STahsin Erdogan static int 396b9fc761eSTahsin Erdogan ext4_xattr_inode_verify_hashes(struct inode *ea_inode, 397b9fc761eSTahsin Erdogan struct ext4_xattr_entry *entry, void *buffer, 398b9fc761eSTahsin Erdogan size_t size) 399dec214d0STahsin Erdogan { 400dec214d0STahsin Erdogan u32 hash; 401dec214d0STahsin Erdogan 402dec214d0STahsin Erdogan /* Verify stored hash matches calculated hash. */ 403dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); 404dec214d0STahsin Erdogan if (hash != ext4_xattr_inode_get_hash(ea_inode)) 405dec214d0STahsin Erdogan return -EFSCORRUPTED; 406b9fc761eSTahsin Erdogan 407b9fc761eSTahsin Erdogan if (entry) { 408b9fc761eSTahsin Erdogan __le32 e_hash, tmp_data; 409b9fc761eSTahsin Erdogan 410b9fc761eSTahsin Erdogan /* Verify entry hash. */ 411b9fc761eSTahsin Erdogan tmp_data = cpu_to_le32(hash); 412b9fc761eSTahsin Erdogan e_hash = ext4_xattr_hash_entry(entry->e_name, entry->e_name_len, 413b9fc761eSTahsin Erdogan &tmp_data, 1); 414b9fc761eSTahsin Erdogan if (e_hash != entry->e_hash) 415b9fc761eSTahsin Erdogan return -EFSCORRUPTED; 416b9fc761eSTahsin Erdogan } 417dec214d0STahsin Erdogan return 0; 418dec214d0STahsin Erdogan } 419dec214d0STahsin Erdogan 420dec214d0STahsin Erdogan #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec) 421dec214d0STahsin Erdogan 422e50e5129SAndreas Dilger /* 423b9fc761eSTahsin Erdogan * Read xattr value from the EA inode. 424e50e5129SAndreas Dilger */ 425e50e5129SAndreas Dilger static int 426b9fc761eSTahsin Erdogan ext4_xattr_inode_get(struct inode *inode, struct ext4_xattr_entry *entry, 427b9fc761eSTahsin Erdogan void *buffer, size_t size) 428e50e5129SAndreas Dilger { 429dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 430bab79b04STahsin Erdogan struct inode *ea_inode; 431dec214d0STahsin Erdogan int err; 432e50e5129SAndreas Dilger 433b9fc761eSTahsin Erdogan err = ext4_xattr_inode_iget(inode, le32_to_cpu(entry->e_value_inum), 434b9fc761eSTahsin Erdogan &ea_inode); 435dec214d0STahsin Erdogan if (err) { 436dec214d0STahsin Erdogan ea_inode = NULL; 437dec214d0STahsin Erdogan goto out; 438dec214d0STahsin Erdogan } 439e50e5129SAndreas Dilger 440dec214d0STahsin Erdogan if (i_size_read(ea_inode) != size) { 441dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 442dec214d0STahsin Erdogan "ea_inode file size=%llu entry size=%zu", 443dec214d0STahsin Erdogan i_size_read(ea_inode), size); 444dec214d0STahsin Erdogan err = -EFSCORRUPTED; 445dec214d0STahsin Erdogan goto out; 446dec214d0STahsin Erdogan } 447dec214d0STahsin Erdogan 448dec214d0STahsin Erdogan err = ext4_xattr_inode_read(ea_inode, buffer, size); 449dec214d0STahsin Erdogan if (err) 450dec214d0STahsin Erdogan goto out; 451dec214d0STahsin Erdogan 452b9fc761eSTahsin Erdogan err = ext4_xattr_inode_verify_hashes(ea_inode, entry, buffer, size); 453dec214d0STahsin Erdogan /* 454dec214d0STahsin Erdogan * Compatibility check for old Lustre ea_inode implementation. Old 455dec214d0STahsin Erdogan * version does not have hash validation, but it has a backpointer 456dec214d0STahsin Erdogan * from ea_inode to the parent inode. 457dec214d0STahsin Erdogan */ 458dec214d0STahsin Erdogan if (err == -EFSCORRUPTED) { 459dec214d0STahsin Erdogan if (EXT4_XATTR_INODE_GET_PARENT(ea_inode) != inode->i_ino || 460dec214d0STahsin Erdogan ea_inode->i_generation != inode->i_generation) { 461dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 462dec214d0STahsin Erdogan "EA inode hash validation failed"); 463dec214d0STahsin Erdogan goto out; 464dec214d0STahsin Erdogan } 465dec214d0STahsin Erdogan /* Do not add ea_inode to the cache. */ 466dec214d0STahsin Erdogan ea_inode_cache = NULL; 467191eac33SEmoly Liu err = 0; 468dec214d0STahsin Erdogan } else if (err) 469dec214d0STahsin Erdogan goto out; 470dec214d0STahsin Erdogan 471dec214d0STahsin Erdogan if (ea_inode_cache) 472dec214d0STahsin Erdogan mb_cache_entry_create(ea_inode_cache, GFP_NOFS, 473dec214d0STahsin Erdogan ext4_xattr_inode_get_hash(ea_inode), 474dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 475dec214d0STahsin Erdogan out: 476e50e5129SAndreas Dilger iput(ea_inode); 477dec214d0STahsin Erdogan return err; 478e50e5129SAndreas Dilger } 479e50e5129SAndreas Dilger 480ac27a0ecSDave Kleikamp static int 481617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 482ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 483ac27a0ecSDave Kleikamp { 484ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 485617ba13bSMingming Cao struct ext4_xattr_entry *entry; 486ac27a0ecSDave Kleikamp size_t size; 487ac27a0ecSDave Kleikamp int error; 48847387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 489ac27a0ecSDave Kleikamp 490ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 491ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 492ac27a0ecSDave Kleikamp 493ac27a0ecSDave Kleikamp error = -ENODATA; 494617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 495ac27a0ecSDave Kleikamp goto cleanup; 496ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 497ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 498617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 499ac27a0ecSDave Kleikamp if (!bh) 500ac27a0ecSDave Kleikamp goto cleanup; 501ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 502ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 503cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 50424676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 505617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 5066a797d27SDarrick J. Wong error = -EFSCORRUPTED; 507ac27a0ecSDave Kleikamp goto cleanup; 508ac27a0ecSDave Kleikamp } 50947387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bh); 510ac27a0ecSDave Kleikamp entry = BFIRST(bh); 5116ba644b9SEric Biggers error = ext4_xattr_find_entry(&entry, name_index, name, 1); 512ac27a0ecSDave Kleikamp if (error) 513ac27a0ecSDave Kleikamp goto cleanup; 514ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 515ac27a0ecSDave Kleikamp if (buffer) { 516ac27a0ecSDave Kleikamp error = -ERANGE; 517ac27a0ecSDave Kleikamp if (size > buffer_size) 518ac27a0ecSDave Kleikamp goto cleanup; 519e50e5129SAndreas Dilger if (entry->e_value_inum) { 520b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 521b9fc761eSTahsin Erdogan size); 522e50e5129SAndreas Dilger if (error) 523e50e5129SAndreas Dilger goto cleanup; 524e50e5129SAndreas Dilger } else { 525e50e5129SAndreas Dilger memcpy(buffer, bh->b_data + 526e50e5129SAndreas Dilger le16_to_cpu(entry->e_value_offs), size); 527e50e5129SAndreas Dilger } 528ac27a0ecSDave Kleikamp } 529ac27a0ecSDave Kleikamp error = size; 530ac27a0ecSDave Kleikamp 531ac27a0ecSDave Kleikamp cleanup: 532ac27a0ecSDave Kleikamp brelse(bh); 533ac27a0ecSDave Kleikamp return error; 534ac27a0ecSDave Kleikamp } 535ac27a0ecSDave Kleikamp 536879b3825STao Ma int 537617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 538ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 539ac27a0ecSDave Kleikamp { 540617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 541617ba13bSMingming Cao struct ext4_xattr_entry *entry; 542617ba13bSMingming Cao struct ext4_inode *raw_inode; 543617ba13bSMingming Cao struct ext4_iloc iloc; 544ac27a0ecSDave Kleikamp size_t size; 545ac27a0ecSDave Kleikamp void *end; 546ac27a0ecSDave Kleikamp int error; 547ac27a0ecSDave Kleikamp 54819f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 549ac27a0ecSDave Kleikamp return -ENODATA; 550617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 551ac27a0ecSDave Kleikamp if (error) 552ac27a0ecSDave Kleikamp return error; 553617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 554ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 555617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 5569e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 557ac27a0ecSDave Kleikamp if (error) 558ac27a0ecSDave Kleikamp goto cleanup; 5596ba644b9SEric Biggers entry = IFIRST(header); 5606ba644b9SEric Biggers error = ext4_xattr_find_entry(&entry, name_index, name, 0); 561ac27a0ecSDave Kleikamp if (error) 562ac27a0ecSDave Kleikamp goto cleanup; 563ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 564ac27a0ecSDave Kleikamp if (buffer) { 565ac27a0ecSDave Kleikamp error = -ERANGE; 566ac27a0ecSDave Kleikamp if (size > buffer_size) 567ac27a0ecSDave Kleikamp goto cleanup; 568e50e5129SAndreas Dilger if (entry->e_value_inum) { 569b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 570b9fc761eSTahsin Erdogan size); 571e50e5129SAndreas Dilger if (error) 572e50e5129SAndreas Dilger goto cleanup; 573e50e5129SAndreas Dilger } else { 574ac27a0ecSDave Kleikamp memcpy(buffer, (void *)IFIRST(header) + 575ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs), size); 576ac27a0ecSDave Kleikamp } 577e50e5129SAndreas Dilger } 578ac27a0ecSDave Kleikamp error = size; 579ac27a0ecSDave Kleikamp 580ac27a0ecSDave Kleikamp cleanup: 581ac27a0ecSDave Kleikamp brelse(iloc.bh); 582ac27a0ecSDave Kleikamp return error; 583ac27a0ecSDave Kleikamp } 584ac27a0ecSDave Kleikamp 585ac27a0ecSDave Kleikamp /* 586617ba13bSMingming Cao * ext4_xattr_get() 587ac27a0ecSDave Kleikamp * 588ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 589ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 590ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 591ac27a0ecSDave Kleikamp * 592ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 593ac27a0ecSDave Kleikamp * used / required on success. 594ac27a0ecSDave Kleikamp */ 595ac27a0ecSDave Kleikamp int 596617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 597ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 598ac27a0ecSDave Kleikamp { 599ac27a0ecSDave Kleikamp int error; 600ac27a0ecSDave Kleikamp 6010db1ff22STheodore Ts'o if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 6020db1ff22STheodore Ts'o return -EIO; 6030db1ff22STheodore Ts'o 604230b8c1aSZhang Zhen if (strlen(name) > 255) 605230b8c1aSZhang Zhen return -ERANGE; 606230b8c1aSZhang Zhen 607617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 608617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 609ac27a0ecSDave Kleikamp buffer_size); 610ac27a0ecSDave Kleikamp if (error == -ENODATA) 611617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 612ac27a0ecSDave Kleikamp buffer_size); 613617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 614ac27a0ecSDave Kleikamp return error; 615ac27a0ecSDave Kleikamp } 616ac27a0ecSDave Kleikamp 617ac27a0ecSDave Kleikamp static int 618431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 619ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 620ac27a0ecSDave Kleikamp { 621ac27a0ecSDave Kleikamp size_t rest = buffer_size; 622ac27a0ecSDave Kleikamp 623617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 62411e27528SStephen Hemminger const struct xattr_handler *handler = 625617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 626ac27a0ecSDave Kleikamp 627764a5c6bSAndreas Gruenbacher if (handler && (!handler->list || handler->list(dentry))) { 628764a5c6bSAndreas Gruenbacher const char *prefix = handler->prefix ?: handler->name; 629764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 630764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 631764a5c6bSAndreas Gruenbacher 632ac27a0ecSDave Kleikamp if (buffer) { 633ac27a0ecSDave Kleikamp if (size > rest) 634ac27a0ecSDave Kleikamp return -ERANGE; 635764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 636764a5c6bSAndreas Gruenbacher buffer += prefix_len; 637764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 638764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 639764a5c6bSAndreas Gruenbacher *buffer++ = 0; 640ac27a0ecSDave Kleikamp } 641ac27a0ecSDave Kleikamp rest -= size; 642ac27a0ecSDave Kleikamp } 643ac27a0ecSDave Kleikamp } 644764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 645ac27a0ecSDave Kleikamp } 646ac27a0ecSDave Kleikamp 647ac27a0ecSDave Kleikamp static int 648431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 649ac27a0ecSDave Kleikamp { 6502b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 651ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 652ac27a0ecSDave Kleikamp int error; 653ac27a0ecSDave Kleikamp 654ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 655ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 656ac27a0ecSDave Kleikamp 657ac27a0ecSDave Kleikamp error = 0; 658617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 659ac27a0ecSDave Kleikamp goto cleanup; 660ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 661ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 662617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 663ac27a0ecSDave Kleikamp error = -EIO; 664ac27a0ecSDave Kleikamp if (!bh) 665ac27a0ecSDave Kleikamp goto cleanup; 666ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 667ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 668cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 66924676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 670617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 6716a797d27SDarrick J. Wong error = -EFSCORRUPTED; 672ac27a0ecSDave Kleikamp goto cleanup; 673ac27a0ecSDave Kleikamp } 67447387409STahsin Erdogan ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); 675431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); 676ac27a0ecSDave Kleikamp 677ac27a0ecSDave Kleikamp cleanup: 678ac27a0ecSDave Kleikamp brelse(bh); 679ac27a0ecSDave Kleikamp 680ac27a0ecSDave Kleikamp return error; 681ac27a0ecSDave Kleikamp } 682ac27a0ecSDave Kleikamp 683ac27a0ecSDave Kleikamp static int 684431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 685ac27a0ecSDave Kleikamp { 6862b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 687617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 688617ba13bSMingming Cao struct ext4_inode *raw_inode; 689617ba13bSMingming Cao struct ext4_iloc iloc; 690ac27a0ecSDave Kleikamp void *end; 691ac27a0ecSDave Kleikamp int error; 692ac27a0ecSDave Kleikamp 69319f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 694ac27a0ecSDave Kleikamp return 0; 695617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 696ac27a0ecSDave Kleikamp if (error) 697ac27a0ecSDave Kleikamp return error; 698617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 699ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 700617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 7019e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 702ac27a0ecSDave Kleikamp if (error) 703ac27a0ecSDave Kleikamp goto cleanup; 704431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 705ac27a0ecSDave Kleikamp buffer, buffer_size); 706ac27a0ecSDave Kleikamp 707ac27a0ecSDave Kleikamp cleanup: 708ac27a0ecSDave Kleikamp brelse(iloc.bh); 709ac27a0ecSDave Kleikamp return error; 710ac27a0ecSDave Kleikamp } 711ac27a0ecSDave Kleikamp 712ac27a0ecSDave Kleikamp /* 713ba7ea1d8SEric Biggers * Inode operation listxattr() 714ba7ea1d8SEric Biggers * 715ba7ea1d8SEric Biggers * d_inode(dentry)->i_rwsem: don't care 716ac27a0ecSDave Kleikamp * 717ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 718ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 719ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 720ac27a0ecSDave Kleikamp * 721ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 722ac27a0ecSDave Kleikamp * used / required on success. 723ac27a0ecSDave Kleikamp */ 724ba7ea1d8SEric Biggers ssize_t 725ba7ea1d8SEric Biggers ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) 726ac27a0ecSDave Kleikamp { 727eaeef867STheodore Ts'o int ret, ret2; 728ac27a0ecSDave Kleikamp 7292b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 730eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 731eaeef867STheodore Ts'o if (ret < 0) 732eaeef867STheodore Ts'o goto errout; 733ac27a0ecSDave Kleikamp if (buffer) { 734eaeef867STheodore Ts'o buffer += ret; 735eaeef867STheodore Ts'o buffer_size -= ret; 736ac27a0ecSDave Kleikamp } 737eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 738eaeef867STheodore Ts'o if (ret < 0) 739eaeef867STheodore Ts'o goto errout; 740eaeef867STheodore Ts'o ret += ret2; 741eaeef867STheodore Ts'o errout: 7422b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 743eaeef867STheodore Ts'o return ret; 744ac27a0ecSDave Kleikamp } 745ac27a0ecSDave Kleikamp 746ac27a0ecSDave Kleikamp /* 747617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 748ac27a0ecSDave Kleikamp * not set, set it. 749ac27a0ecSDave Kleikamp */ 750617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 751ac27a0ecSDave Kleikamp struct super_block *sb) 752ac27a0ecSDave Kleikamp { 753e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 754ac27a0ecSDave Kleikamp return; 755ac27a0ecSDave Kleikamp 7565d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 757617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 758e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 759a0375156STheodore Ts'o ext4_handle_dirty_super(handle, sb); 760ac27a0ecSDave Kleikamp } 761ac27a0ecSDave Kleikamp } 762ac27a0ecSDave Kleikamp 7637a9ca53aSTahsin Erdogan int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) 7647a9ca53aSTahsin Erdogan { 7657a9ca53aSTahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 7667a9ca53aSTahsin Erdogan struct buffer_head *bh = NULL; 7677a9ca53aSTahsin Erdogan struct ext4_inode *raw_inode; 7687a9ca53aSTahsin Erdogan struct ext4_xattr_ibody_header *header; 7697a9ca53aSTahsin Erdogan struct ext4_xattr_entry *entry; 7707a9ca53aSTahsin Erdogan qsize_t ea_inode_refs = 0; 7717a9ca53aSTahsin Erdogan void *end; 7727a9ca53aSTahsin Erdogan int ret; 7737a9ca53aSTahsin Erdogan 7747a9ca53aSTahsin Erdogan lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); 7757a9ca53aSTahsin Erdogan 7767a9ca53aSTahsin Erdogan if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 7777a9ca53aSTahsin Erdogan ret = ext4_get_inode_loc(inode, &iloc); 7787a9ca53aSTahsin Erdogan if (ret) 7797a9ca53aSTahsin Erdogan goto out; 7807a9ca53aSTahsin Erdogan raw_inode = ext4_raw_inode(&iloc); 7817a9ca53aSTahsin Erdogan header = IHDR(inode, raw_inode); 7827a9ca53aSTahsin Erdogan end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 7837a9ca53aSTahsin Erdogan ret = xattr_check_inode(inode, header, end); 7847a9ca53aSTahsin Erdogan if (ret) 7857a9ca53aSTahsin Erdogan goto out; 7867a9ca53aSTahsin Erdogan 7877a9ca53aSTahsin Erdogan for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); 7887a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 7897a9ca53aSTahsin Erdogan if (entry->e_value_inum) 7907a9ca53aSTahsin Erdogan ea_inode_refs++; 7917a9ca53aSTahsin Erdogan } 7927a9ca53aSTahsin Erdogan 7937a9ca53aSTahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 7947a9ca53aSTahsin Erdogan bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 7957a9ca53aSTahsin Erdogan if (!bh) { 7967a9ca53aSTahsin Erdogan ret = -EIO; 7977a9ca53aSTahsin Erdogan goto out; 7987a9ca53aSTahsin Erdogan } 7997a9ca53aSTahsin Erdogan 8007a9ca53aSTahsin Erdogan if (ext4_xattr_check_block(inode, bh)) { 8017a9ca53aSTahsin Erdogan ret = -EFSCORRUPTED; 8027a9ca53aSTahsin Erdogan goto out; 8037a9ca53aSTahsin Erdogan } 8047a9ca53aSTahsin Erdogan 8057a9ca53aSTahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 8067a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 8077a9ca53aSTahsin Erdogan if (entry->e_value_inum) 8087a9ca53aSTahsin Erdogan ea_inode_refs++; 8097a9ca53aSTahsin Erdogan } 8107a9ca53aSTahsin Erdogan *usage = ea_inode_refs + 1; 8117a9ca53aSTahsin Erdogan ret = 0; 8127a9ca53aSTahsin Erdogan out: 8137a9ca53aSTahsin Erdogan brelse(iloc.bh); 8147a9ca53aSTahsin Erdogan brelse(bh); 8157a9ca53aSTahsin Erdogan return ret; 8167a9ca53aSTahsin Erdogan } 8177a9ca53aSTahsin Erdogan 818dec214d0STahsin Erdogan static inline size_t round_up_cluster(struct inode *inode, size_t length) 819dec214d0STahsin Erdogan { 820dec214d0STahsin Erdogan struct super_block *sb = inode->i_sb; 821dec214d0STahsin Erdogan size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + 822dec214d0STahsin Erdogan inode->i_blkbits); 823dec214d0STahsin Erdogan size_t mask = ~(cluster_size - 1); 824dec214d0STahsin Erdogan 825dec214d0STahsin Erdogan return (length + cluster_size - 1) & mask; 826dec214d0STahsin Erdogan } 827dec214d0STahsin Erdogan 828dec214d0STahsin Erdogan static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) 829dec214d0STahsin Erdogan { 830dec214d0STahsin Erdogan int err; 831dec214d0STahsin Erdogan 832dec214d0STahsin Erdogan err = dquot_alloc_inode(inode); 833dec214d0STahsin Erdogan if (err) 834dec214d0STahsin Erdogan return err; 835dec214d0STahsin Erdogan err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); 836dec214d0STahsin Erdogan if (err) 837dec214d0STahsin Erdogan dquot_free_inode(inode); 838dec214d0STahsin Erdogan return err; 839dec214d0STahsin Erdogan } 840dec214d0STahsin Erdogan 841dec214d0STahsin Erdogan static void ext4_xattr_inode_free_quota(struct inode *inode, size_t len) 842dec214d0STahsin Erdogan { 843dec214d0STahsin Erdogan dquot_free_space_nodirty(inode, round_up_cluster(inode, len)); 844dec214d0STahsin Erdogan dquot_free_inode(inode); 845dec214d0STahsin Erdogan } 846dec214d0STahsin Erdogan 847af65207cSTahsin Erdogan int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode, 848af65207cSTahsin Erdogan struct buffer_head *block_bh, size_t value_len, 849af65207cSTahsin Erdogan bool is_create) 850dec214d0STahsin Erdogan { 851dec214d0STahsin Erdogan int credits; 852dec214d0STahsin Erdogan int blocks; 853dec214d0STahsin Erdogan 854dec214d0STahsin Erdogan /* 855dec214d0STahsin Erdogan * 1) Owner inode update 856dec214d0STahsin Erdogan * 2) Ref count update on old xattr block 857dec214d0STahsin Erdogan * 3) new xattr block 858dec214d0STahsin Erdogan * 4) block bitmap update for new xattr block 859dec214d0STahsin Erdogan * 5) group descriptor for new xattr block 860dec214d0STahsin Erdogan * 6) block bitmap update for old xattr block 861dec214d0STahsin Erdogan * 7) group descriptor for old block 862dec214d0STahsin Erdogan * 863dec214d0STahsin Erdogan * 6 & 7 can happen if we have two racing threads T_a and T_b 864dec214d0STahsin Erdogan * which are each trying to set an xattr on inodes I_a and I_b 865dec214d0STahsin Erdogan * which were both initially sharing an xattr block. 866dec214d0STahsin Erdogan */ 867dec214d0STahsin Erdogan credits = 7; 868dec214d0STahsin Erdogan 869dec214d0STahsin Erdogan /* Quota updates. */ 870dec214d0STahsin Erdogan credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); 871dec214d0STahsin Erdogan 872dec214d0STahsin Erdogan /* 873dec214d0STahsin Erdogan * In case of inline data, we may push out the data to a block, 874dec214d0STahsin Erdogan * so we need to reserve credits for this eventuality 875dec214d0STahsin Erdogan */ 876af65207cSTahsin Erdogan if (inode && ext4_has_inline_data(inode)) 877dec214d0STahsin Erdogan credits += ext4_writepage_trans_blocks(inode) + 1; 878dec214d0STahsin Erdogan 879dec214d0STahsin Erdogan /* We are done if ea_inode feature is not enabled. */ 880dec214d0STahsin Erdogan if (!ext4_has_feature_ea_inode(sb)) 881dec214d0STahsin Erdogan return credits; 882dec214d0STahsin Erdogan 883dec214d0STahsin Erdogan /* New ea_inode, inode map, block bitmap, group descriptor. */ 884dec214d0STahsin Erdogan credits += 4; 885dec214d0STahsin Erdogan 886dec214d0STahsin Erdogan /* Data blocks. */ 887dec214d0STahsin Erdogan blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 888dec214d0STahsin Erdogan 889dec214d0STahsin Erdogan /* Indirection block or one level of extent tree. */ 890dec214d0STahsin Erdogan blocks += 1; 891dec214d0STahsin Erdogan 892dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 893dec214d0STahsin Erdogan credits += blocks * 2; 894dec214d0STahsin Erdogan 895dec214d0STahsin Erdogan /* Blocks themselves. */ 896dec214d0STahsin Erdogan credits += blocks; 897dec214d0STahsin Erdogan 898af65207cSTahsin Erdogan if (!is_create) { 899dec214d0STahsin Erdogan /* Dereference ea_inode holding old xattr value. 900dec214d0STahsin Erdogan * Old ea_inode, inode map, block bitmap, group descriptor. 901dec214d0STahsin Erdogan */ 902dec214d0STahsin Erdogan credits += 4; 903dec214d0STahsin Erdogan 904dec214d0STahsin Erdogan /* Data blocks for old ea_inode. */ 905dec214d0STahsin Erdogan blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; 906dec214d0STahsin Erdogan 907af65207cSTahsin Erdogan /* Indirection block or one level of extent tree for old 908af65207cSTahsin Erdogan * ea_inode. 909af65207cSTahsin Erdogan */ 910dec214d0STahsin Erdogan blocks += 1; 911dec214d0STahsin Erdogan 912dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 913dec214d0STahsin Erdogan credits += blocks * 2; 914af65207cSTahsin Erdogan } 915dec214d0STahsin Erdogan 916dec214d0STahsin Erdogan /* We may need to clone the existing xattr block in which case we need 917dec214d0STahsin Erdogan * to increment ref counts for existing ea_inodes referenced by it. 918dec214d0STahsin Erdogan */ 919dec214d0STahsin Erdogan if (block_bh) { 920dec214d0STahsin Erdogan struct ext4_xattr_entry *entry = BFIRST(block_bh); 921dec214d0STahsin Erdogan 922dec214d0STahsin Erdogan for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) 923dec214d0STahsin Erdogan if (entry->e_value_inum) 924dec214d0STahsin Erdogan /* Ref count update on ea_inode. */ 925dec214d0STahsin Erdogan credits += 1; 926dec214d0STahsin Erdogan } 927dec214d0STahsin Erdogan return credits; 928dec214d0STahsin Erdogan } 929dec214d0STahsin Erdogan 93030a7eb97STahsin Erdogan static int ext4_xattr_ensure_credits(handle_t *handle, struct inode *inode, 93130a7eb97STahsin Erdogan int credits, struct buffer_head *bh, 93230a7eb97STahsin Erdogan bool dirty, bool block_csum) 93330a7eb97STahsin Erdogan { 93430a7eb97STahsin Erdogan int error; 93530a7eb97STahsin Erdogan 93630a7eb97STahsin Erdogan if (!ext4_handle_valid(handle)) 93730a7eb97STahsin Erdogan return 0; 93830a7eb97STahsin Erdogan 93930a7eb97STahsin Erdogan if (handle->h_buffer_credits >= credits) 94030a7eb97STahsin Erdogan return 0; 94130a7eb97STahsin Erdogan 94230a7eb97STahsin Erdogan error = ext4_journal_extend(handle, credits - handle->h_buffer_credits); 94330a7eb97STahsin Erdogan if (!error) 94430a7eb97STahsin Erdogan return 0; 94530a7eb97STahsin Erdogan if (error < 0) { 94630a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Extend journal (error %d)", error); 94730a7eb97STahsin Erdogan return error; 94830a7eb97STahsin Erdogan } 94930a7eb97STahsin Erdogan 95030a7eb97STahsin Erdogan if (bh && dirty) { 95130a7eb97STahsin Erdogan if (block_csum) 95230a7eb97STahsin Erdogan ext4_xattr_block_csum_set(inode, bh); 95330a7eb97STahsin Erdogan error = ext4_handle_dirty_metadata(handle, NULL, bh); 95430a7eb97STahsin Erdogan if (error) { 95530a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Handle metadata (error %d)", 95630a7eb97STahsin Erdogan error); 95730a7eb97STahsin Erdogan return error; 95830a7eb97STahsin Erdogan } 95930a7eb97STahsin Erdogan } 96030a7eb97STahsin Erdogan 96130a7eb97STahsin Erdogan error = ext4_journal_restart(handle, credits); 96230a7eb97STahsin Erdogan if (error) { 96330a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Restart journal (error %d)", error); 96430a7eb97STahsin Erdogan return error; 96530a7eb97STahsin Erdogan } 96630a7eb97STahsin Erdogan 96730a7eb97STahsin Erdogan if (bh) { 96830a7eb97STahsin Erdogan error = ext4_journal_get_write_access(handle, bh); 96930a7eb97STahsin Erdogan if (error) { 97030a7eb97STahsin Erdogan ext4_warning(inode->i_sb, 97130a7eb97STahsin Erdogan "Get write access failed (error %d)", 97230a7eb97STahsin Erdogan error); 97330a7eb97STahsin Erdogan return error; 97430a7eb97STahsin Erdogan } 97530a7eb97STahsin Erdogan } 97630a7eb97STahsin Erdogan return 0; 97730a7eb97STahsin Erdogan } 97830a7eb97STahsin Erdogan 979dec214d0STahsin Erdogan static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, 980dec214d0STahsin Erdogan int ref_change) 981dec214d0STahsin Erdogan { 982dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(ea_inode); 983dec214d0STahsin Erdogan struct ext4_iloc iloc; 984dec214d0STahsin Erdogan s64 ref_count; 985dec214d0STahsin Erdogan u32 hash; 986dec214d0STahsin Erdogan int ret; 987dec214d0STahsin Erdogan 988dec214d0STahsin Erdogan inode_lock(ea_inode); 989dec214d0STahsin Erdogan 990dec214d0STahsin Erdogan ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); 991dec214d0STahsin Erdogan if (ret) { 992dec214d0STahsin Erdogan iloc.bh = NULL; 993dec214d0STahsin Erdogan goto out; 994dec214d0STahsin Erdogan } 995dec214d0STahsin Erdogan 996dec214d0STahsin Erdogan ref_count = ext4_xattr_inode_get_ref(ea_inode); 997dec214d0STahsin Erdogan ref_count += ref_change; 998dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, ref_count); 999dec214d0STahsin Erdogan 1000dec214d0STahsin Erdogan if (ref_change > 0) { 1001dec214d0STahsin Erdogan WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", 1002dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1003dec214d0STahsin Erdogan 1004dec214d0STahsin Erdogan if (ref_count == 1) { 1005dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", 1006dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1007dec214d0STahsin Erdogan 1008dec214d0STahsin Erdogan set_nlink(ea_inode, 1); 1009dec214d0STahsin Erdogan ext4_orphan_del(handle, ea_inode); 1010dec214d0STahsin Erdogan 1011cdb7ee4cSTahsin Erdogan if (ea_inode_cache) { 1012dec214d0STahsin Erdogan hash = ext4_xattr_inode_get_hash(ea_inode); 1013cdb7ee4cSTahsin Erdogan mb_cache_entry_create(ea_inode_cache, 1014cdb7ee4cSTahsin Erdogan GFP_NOFS, hash, 1015dec214d0STahsin Erdogan ea_inode->i_ino, 1016dec214d0STahsin Erdogan true /* reusable */); 1017dec214d0STahsin Erdogan } 1018cdb7ee4cSTahsin Erdogan } 1019dec214d0STahsin Erdogan } else { 1020dec214d0STahsin Erdogan WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", 1021dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1022dec214d0STahsin Erdogan 1023dec214d0STahsin Erdogan if (ref_count == 0) { 1024dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink != 1, 1025dec214d0STahsin Erdogan "EA inode %lu i_nlink=%u", 1026dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1027dec214d0STahsin Erdogan 1028dec214d0STahsin Erdogan clear_nlink(ea_inode); 1029dec214d0STahsin Erdogan ext4_orphan_add(handle, ea_inode); 1030dec214d0STahsin Erdogan 1031cdb7ee4cSTahsin Erdogan if (ea_inode_cache) { 1032dec214d0STahsin Erdogan hash = ext4_xattr_inode_get_hash(ea_inode); 1033dec214d0STahsin Erdogan mb_cache_entry_delete(ea_inode_cache, hash, 1034dec214d0STahsin Erdogan ea_inode->i_ino); 1035dec214d0STahsin Erdogan } 1036dec214d0STahsin Erdogan } 1037cdb7ee4cSTahsin Erdogan } 1038dec214d0STahsin Erdogan 1039dec214d0STahsin Erdogan ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); 1040dec214d0STahsin Erdogan iloc.bh = NULL; 1041dec214d0STahsin Erdogan if (ret) 1042dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 1043dec214d0STahsin Erdogan "ext4_mark_iloc_dirty() failed ret=%d", ret); 1044dec214d0STahsin Erdogan out: 1045dec214d0STahsin Erdogan brelse(iloc.bh); 1046dec214d0STahsin Erdogan inode_unlock(ea_inode); 1047dec214d0STahsin Erdogan return ret; 1048dec214d0STahsin Erdogan } 1049dec214d0STahsin Erdogan 1050dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) 1051dec214d0STahsin Erdogan { 1052dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, 1); 1053dec214d0STahsin Erdogan } 1054dec214d0STahsin Erdogan 1055dec214d0STahsin Erdogan static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) 1056dec214d0STahsin Erdogan { 1057dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, -1); 1058dec214d0STahsin Erdogan } 1059dec214d0STahsin Erdogan 1060dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, 1061dec214d0STahsin Erdogan struct ext4_xattr_entry *first) 1062dec214d0STahsin Erdogan { 1063dec214d0STahsin Erdogan struct inode *ea_inode; 1064dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 1065dec214d0STahsin Erdogan struct ext4_xattr_entry *failed_entry; 1066dec214d0STahsin Erdogan unsigned int ea_ino; 1067dec214d0STahsin Erdogan int err, saved_err; 1068dec214d0STahsin Erdogan 1069dec214d0STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 1070dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1071dec214d0STahsin Erdogan if (!entry->e_value_inum) 1072dec214d0STahsin Erdogan continue; 1073dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1074dec214d0STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, &ea_inode); 1075dec214d0STahsin Erdogan if (err) 1076dec214d0STahsin Erdogan goto cleanup; 1077dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1078dec214d0STahsin Erdogan if (err) { 1079dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "inc ref error %d", err); 1080dec214d0STahsin Erdogan iput(ea_inode); 1081dec214d0STahsin Erdogan goto cleanup; 1082dec214d0STahsin Erdogan } 1083dec214d0STahsin Erdogan iput(ea_inode); 1084dec214d0STahsin Erdogan } 1085dec214d0STahsin Erdogan return 0; 1086dec214d0STahsin Erdogan 1087dec214d0STahsin Erdogan cleanup: 1088dec214d0STahsin Erdogan saved_err = err; 1089dec214d0STahsin Erdogan failed_entry = entry; 1090dec214d0STahsin Erdogan 1091dec214d0STahsin Erdogan for (entry = first; entry != failed_entry; 1092dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1093dec214d0STahsin Erdogan if (!entry->e_value_inum) 1094dec214d0STahsin Erdogan continue; 1095dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1096dec214d0STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, &ea_inode); 1097dec214d0STahsin Erdogan if (err) { 1098dec214d0STahsin Erdogan ext4_warning(parent->i_sb, 1099dec214d0STahsin Erdogan "cleanup ea_ino %u iget error %d", ea_ino, 1100dec214d0STahsin Erdogan err); 1101dec214d0STahsin Erdogan continue; 1102dec214d0STahsin Erdogan } 1103dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1104dec214d0STahsin Erdogan if (err) 1105dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "cleanup dec ref error %d", 1106dec214d0STahsin Erdogan err); 1107dec214d0STahsin Erdogan iput(ea_inode); 1108dec214d0STahsin Erdogan } 1109dec214d0STahsin Erdogan return saved_err; 1110dec214d0STahsin Erdogan } 1111dec214d0STahsin Erdogan 111230a7eb97STahsin Erdogan static void 1113dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, 111430a7eb97STahsin Erdogan struct buffer_head *bh, 111530a7eb97STahsin Erdogan struct ext4_xattr_entry *first, bool block_csum, 111630a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1117dec214d0STahsin Erdogan int extra_credits, bool skip_quota) 111830a7eb97STahsin Erdogan { 111930a7eb97STahsin Erdogan struct inode *ea_inode; 112030a7eb97STahsin Erdogan struct ext4_xattr_entry *entry; 112130a7eb97STahsin Erdogan bool dirty = false; 112230a7eb97STahsin Erdogan unsigned int ea_ino; 112330a7eb97STahsin Erdogan int err; 112430a7eb97STahsin Erdogan int credits; 112530a7eb97STahsin Erdogan 112630a7eb97STahsin Erdogan /* One credit for dec ref on ea_inode, one for orphan list addition, */ 112730a7eb97STahsin Erdogan credits = 2 + extra_credits; 112830a7eb97STahsin Erdogan 112930a7eb97STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 113030a7eb97STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 113130a7eb97STahsin Erdogan if (!entry->e_value_inum) 113230a7eb97STahsin Erdogan continue; 113330a7eb97STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 113430a7eb97STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, &ea_inode); 113530a7eb97STahsin Erdogan if (err) 113630a7eb97STahsin Erdogan continue; 113730a7eb97STahsin Erdogan 113830a7eb97STahsin Erdogan err = ext4_expand_inode_array(ea_inode_array, ea_inode); 113930a7eb97STahsin Erdogan if (err) { 114030a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, 114130a7eb97STahsin Erdogan "Expand inode array err=%d", err); 114230a7eb97STahsin Erdogan iput(ea_inode); 114330a7eb97STahsin Erdogan continue; 114430a7eb97STahsin Erdogan } 114530a7eb97STahsin Erdogan 114630a7eb97STahsin Erdogan err = ext4_xattr_ensure_credits(handle, parent, credits, bh, 114730a7eb97STahsin Erdogan dirty, block_csum); 114830a7eb97STahsin Erdogan if (err) { 114930a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, "Ensure credits err=%d", 115030a7eb97STahsin Erdogan err); 115130a7eb97STahsin Erdogan continue; 115230a7eb97STahsin Erdogan } 115330a7eb97STahsin Erdogan 1154dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1155dec214d0STahsin Erdogan if (err) { 1156dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", 1157dec214d0STahsin Erdogan err); 1158dec214d0STahsin Erdogan continue; 1159dec214d0STahsin Erdogan } 1160dec214d0STahsin Erdogan 1161dec214d0STahsin Erdogan if (!skip_quota) 1162dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(parent, 1163dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 116430a7eb97STahsin Erdogan 116530a7eb97STahsin Erdogan /* 116630a7eb97STahsin Erdogan * Forget about ea_inode within the same transaction that 116730a7eb97STahsin Erdogan * decrements the ref count. This avoids duplicate decrements in 116830a7eb97STahsin Erdogan * case the rest of the work spills over to subsequent 116930a7eb97STahsin Erdogan * transactions. 117030a7eb97STahsin Erdogan */ 117130a7eb97STahsin Erdogan entry->e_value_inum = 0; 117230a7eb97STahsin Erdogan entry->e_value_size = 0; 117330a7eb97STahsin Erdogan 117430a7eb97STahsin Erdogan dirty = true; 117530a7eb97STahsin Erdogan } 117630a7eb97STahsin Erdogan 117730a7eb97STahsin Erdogan if (dirty) { 117830a7eb97STahsin Erdogan /* 117930a7eb97STahsin Erdogan * Note that we are deliberately skipping csum calculation for 118030a7eb97STahsin Erdogan * the final update because we do not expect any journal 118130a7eb97STahsin Erdogan * restarts until xattr block is freed. 118230a7eb97STahsin Erdogan */ 118330a7eb97STahsin Erdogan 118430a7eb97STahsin Erdogan err = ext4_handle_dirty_metadata(handle, NULL, bh); 118530a7eb97STahsin Erdogan if (err) 118630a7eb97STahsin Erdogan ext4_warning_inode(parent, 118730a7eb97STahsin Erdogan "handle dirty metadata err=%d", err); 118830a7eb97STahsin Erdogan } 118930a7eb97STahsin Erdogan } 119030a7eb97STahsin Erdogan 1191ac27a0ecSDave Kleikamp /* 1192ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 1193ec4cb1aaSJan Kara * otherwise free the block. 1194ac27a0ecSDave Kleikamp */ 1195ac27a0ecSDave Kleikamp static void 1196617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 1197dec214d0STahsin Erdogan struct buffer_head *bh, 1198dec214d0STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1199dec214d0STahsin Erdogan int extra_credits) 1200ac27a0ecSDave Kleikamp { 120147387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 12026048c64bSAndreas Gruenbacher u32 hash, ref; 12038a2bfdcbSMingming Cao int error = 0; 1204ac27a0ecSDave Kleikamp 12055d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 12068a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 12078a2bfdcbSMingming Cao if (error) 12088a2bfdcbSMingming Cao goto out; 12098a2bfdcbSMingming Cao 12108a2bfdcbSMingming Cao lock_buffer(bh); 12116048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 12126048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 12136048c64bSAndreas Gruenbacher if (ref == 1) { 1214ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 121582939d79SJan Kara /* 121682939d79SJan Kara * This must happen under buffer lock for 121782939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 121882939d79SJan Kara */ 1219cdb7ee4cSTahsin Erdogan if (ea_block_cache) 1220cdb7ee4cSTahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, 1221cdb7ee4cSTahsin Erdogan bh->b_blocknr); 1222ac27a0ecSDave Kleikamp get_bh(bh); 1223ec4cb1aaSJan Kara unlock_buffer(bh); 1224dec214d0STahsin Erdogan 1225dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) 1226dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, bh, 1227dec214d0STahsin Erdogan BFIRST(bh), 1228dec214d0STahsin Erdogan true /* block_csum */, 1229dec214d0STahsin Erdogan ea_inode_array, 1230dec214d0STahsin Erdogan extra_credits, 1231dec214d0STahsin Erdogan true /* skip_quota */); 1232e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 1233e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 1234e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 1235ac27a0ecSDave Kleikamp } else { 12366048c64bSAndreas Gruenbacher ref--; 12376048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 12386048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 12396048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 12406048c64bSAndreas Gruenbacher 1241cdb7ee4cSTahsin Erdogan if (ea_block_cache) { 124247387409STahsin Erdogan ce = mb_cache_entry_get(ea_block_cache, hash, 12436048c64bSAndreas Gruenbacher bh->b_blocknr); 12446048c64bSAndreas Gruenbacher if (ce) { 12456048c64bSAndreas Gruenbacher ce->e_reusable = 1; 124647387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 12476048c64bSAndreas Gruenbacher } 12486048c64bSAndreas Gruenbacher } 1249cdb7ee4cSTahsin Erdogan } 12506048c64bSAndreas Gruenbacher 1251dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bh); 1252ec4cb1aaSJan Kara /* 1253ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 1254ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 1255ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 1256ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 1257ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 1258dac7a4b4STheodore Ts'o * call ext4_handle_dirty_metadata() with locked buffer as 1259ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 1260ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 1261ec4cb1aaSJan Kara */ 1262ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 1263dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1264c1bb05a6SEric Sandeen unlock_buffer(bh); 1265ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 1266dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1267ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 12680390131bSFrank Mayhar ext4_handle_sync(handle); 12691231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 1270ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 1271ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 1272ac27a0ecSDave Kleikamp } 12738a2bfdcbSMingming Cao out: 12748a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 12758a2bfdcbSMingming Cao return; 1276ac27a0ecSDave Kleikamp } 1277ac27a0ecSDave Kleikamp 12786dd4ee7cSKalpak Shah /* 12796dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 12806dd4ee7cSKalpak Shah * bytes used by EA entries. 12816dd4ee7cSKalpak Shah */ 12826dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 12836dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 12846dd4ee7cSKalpak Shah { 12856dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1286e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 12876dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 12886dd4ee7cSKalpak Shah if (offs < *min_offs) 12896dd4ee7cSKalpak Shah *min_offs = offs; 12906dd4ee7cSKalpak Shah } 12917b1b2c1bSTheodore Ts'o if (total) 12927b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 12936dd4ee7cSKalpak Shah } 12946dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 12956dd4ee7cSKalpak Shah } 12966dd4ee7cSKalpak Shah 1297e50e5129SAndreas Dilger /* 1298e50e5129SAndreas Dilger * Write the value of the EA in an inode. 1299e50e5129SAndreas Dilger */ 1300e50e5129SAndreas Dilger static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, 1301e50e5129SAndreas Dilger const void *buf, int bufsize) 1302e50e5129SAndreas Dilger { 1303e50e5129SAndreas Dilger struct buffer_head *bh = NULL; 1304e50e5129SAndreas Dilger unsigned long block = 0; 1305dec214d0STahsin Erdogan int blocksize = ea_inode->i_sb->s_blocksize; 1306dec214d0STahsin Erdogan int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; 1307e50e5129SAndreas Dilger int csize, wsize = 0; 1308e50e5129SAndreas Dilger int ret = 0; 1309e50e5129SAndreas Dilger int retries = 0; 1310e50e5129SAndreas Dilger 1311e50e5129SAndreas Dilger retry: 1312e50e5129SAndreas Dilger while (ret >= 0 && ret < max_blocks) { 1313e50e5129SAndreas Dilger struct ext4_map_blocks map; 1314e50e5129SAndreas Dilger map.m_lblk = block += ret; 1315e50e5129SAndreas Dilger map.m_len = max_blocks -= ret; 1316e50e5129SAndreas Dilger 1317e50e5129SAndreas Dilger ret = ext4_map_blocks(handle, ea_inode, &map, 1318e50e5129SAndreas Dilger EXT4_GET_BLOCKS_CREATE); 1319e50e5129SAndreas Dilger if (ret <= 0) { 1320e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1321e50e5129SAndreas Dilger if (ret == -ENOSPC && 1322e50e5129SAndreas Dilger ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { 1323e50e5129SAndreas Dilger ret = 0; 1324e50e5129SAndreas Dilger goto retry; 1325e50e5129SAndreas Dilger } 1326e50e5129SAndreas Dilger break; 1327e50e5129SAndreas Dilger } 1328e50e5129SAndreas Dilger } 1329e50e5129SAndreas Dilger 1330e50e5129SAndreas Dilger if (ret < 0) 1331e50e5129SAndreas Dilger return ret; 1332e50e5129SAndreas Dilger 1333e50e5129SAndreas Dilger block = 0; 1334e50e5129SAndreas Dilger while (wsize < bufsize) { 1335e50e5129SAndreas Dilger if (bh != NULL) 1336e50e5129SAndreas Dilger brelse(bh); 1337e50e5129SAndreas Dilger csize = (bufsize - wsize) > blocksize ? blocksize : 1338e50e5129SAndreas Dilger bufsize - wsize; 1339e50e5129SAndreas Dilger bh = ext4_getblk(handle, ea_inode, block, 0); 1340e50e5129SAndreas Dilger if (IS_ERR(bh)) 1341e50e5129SAndreas Dilger return PTR_ERR(bh); 1342e50e5129SAndreas Dilger ret = ext4_journal_get_write_access(handle, bh); 1343e50e5129SAndreas Dilger if (ret) 1344e50e5129SAndreas Dilger goto out; 1345e50e5129SAndreas Dilger 1346e50e5129SAndreas Dilger memcpy(bh->b_data, buf, csize); 1347e50e5129SAndreas Dilger set_buffer_uptodate(bh); 1348e50e5129SAndreas Dilger ext4_handle_dirty_metadata(handle, ea_inode, bh); 1349e50e5129SAndreas Dilger 1350e50e5129SAndreas Dilger buf += csize; 1351e50e5129SAndreas Dilger wsize += csize; 1352e50e5129SAndreas Dilger block += 1; 1353e50e5129SAndreas Dilger } 1354e50e5129SAndreas Dilger 1355e50e5129SAndreas Dilger inode_lock(ea_inode); 1356e50e5129SAndreas Dilger i_size_write(ea_inode, wsize); 1357e50e5129SAndreas Dilger ext4_update_i_disksize(ea_inode, wsize); 1358e50e5129SAndreas Dilger inode_unlock(ea_inode); 1359e50e5129SAndreas Dilger 1360e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1361e50e5129SAndreas Dilger 1362e50e5129SAndreas Dilger out: 1363e50e5129SAndreas Dilger brelse(bh); 1364e50e5129SAndreas Dilger 1365e50e5129SAndreas Dilger return ret; 1366e50e5129SAndreas Dilger } 1367e50e5129SAndreas Dilger 1368e50e5129SAndreas Dilger /* 1369e50e5129SAndreas Dilger * Create an inode to store the value of a large EA. 1370e50e5129SAndreas Dilger */ 1371e50e5129SAndreas Dilger static struct inode *ext4_xattr_inode_create(handle_t *handle, 1372dec214d0STahsin Erdogan struct inode *inode, u32 hash) 1373e50e5129SAndreas Dilger { 1374e50e5129SAndreas Dilger struct inode *ea_inode = NULL; 13759e1ba001STahsin Erdogan uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; 1376bd3b963bSTahsin Erdogan int err; 1377e50e5129SAndreas Dilger 1378e50e5129SAndreas Dilger /* 1379e50e5129SAndreas Dilger * Let the next inode be the goal, so we try and allocate the EA inode 1380e50e5129SAndreas Dilger * in the same group, or nearby one. 1381e50e5129SAndreas Dilger */ 1382e50e5129SAndreas Dilger ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, 13839e1ba001STahsin Erdogan S_IFREG | 0600, NULL, inode->i_ino + 1, owner, 13841b917ed8STahsin Erdogan EXT4_EA_INODE_FL); 1385e50e5129SAndreas Dilger if (!IS_ERR(ea_inode)) { 1386e50e5129SAndreas Dilger ea_inode->i_op = &ext4_file_inode_operations; 1387e50e5129SAndreas Dilger ea_inode->i_fop = &ext4_file_operations; 1388e50e5129SAndreas Dilger ext4_set_aops(ea_inode); 138933d201e0STahsin Erdogan ext4_xattr_inode_set_class(ea_inode); 1390e50e5129SAndreas Dilger unlock_new_inode(ea_inode); 1391dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, 1); 1392dec214d0STahsin Erdogan ext4_xattr_inode_set_hash(ea_inode, hash); 1393dec214d0STahsin Erdogan err = ext4_mark_inode_dirty(handle, ea_inode); 1394dec214d0STahsin Erdogan if (!err) 1395bd3b963bSTahsin Erdogan err = ext4_inode_attach_jinode(ea_inode); 1396bd3b963bSTahsin Erdogan if (err) { 1397bd3b963bSTahsin Erdogan iput(ea_inode); 1398bd3b963bSTahsin Erdogan return ERR_PTR(err); 1399bd3b963bSTahsin Erdogan } 1400dec214d0STahsin Erdogan 1401dec214d0STahsin Erdogan /* 1402dec214d0STahsin Erdogan * Xattr inodes are shared therefore quota charging is performed 1403dec214d0STahsin Erdogan * at a higher level. 1404dec214d0STahsin Erdogan */ 1405dec214d0STahsin Erdogan dquot_free_inode(ea_inode); 1406dec214d0STahsin Erdogan dquot_drop(ea_inode); 1407dec214d0STahsin Erdogan inode_lock(ea_inode); 1408dec214d0STahsin Erdogan ea_inode->i_flags |= S_NOQUOTA; 1409dec214d0STahsin Erdogan inode_unlock(ea_inode); 1410e50e5129SAndreas Dilger } 1411e50e5129SAndreas Dilger 1412e50e5129SAndreas Dilger return ea_inode; 1413e50e5129SAndreas Dilger } 1414e50e5129SAndreas Dilger 1415dec214d0STahsin Erdogan static struct inode * 1416dec214d0STahsin Erdogan ext4_xattr_inode_cache_find(struct inode *inode, const void *value, 1417dec214d0STahsin Erdogan size_t value_len, u32 hash) 1418e50e5129SAndreas Dilger { 1419dec214d0STahsin Erdogan struct inode *ea_inode; 1420dec214d0STahsin Erdogan struct mb_cache_entry *ce; 1421dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 1422dec214d0STahsin Erdogan void *ea_data; 1423e50e5129SAndreas Dilger 1424cdb7ee4cSTahsin Erdogan if (!ea_inode_cache) 1425cdb7ee4cSTahsin Erdogan return NULL; 1426cdb7ee4cSTahsin Erdogan 1427dec214d0STahsin Erdogan ce = mb_cache_entry_find_first(ea_inode_cache, hash); 1428dec214d0STahsin Erdogan if (!ce) 1429dec214d0STahsin Erdogan return NULL; 1430e50e5129SAndreas Dilger 1431dec214d0STahsin Erdogan ea_data = ext4_kvmalloc(value_len, GFP_NOFS); 1432dec214d0STahsin Erdogan if (!ea_data) { 1433dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1434dec214d0STahsin Erdogan return NULL; 1435dec214d0STahsin Erdogan } 1436dec214d0STahsin Erdogan 1437dec214d0STahsin Erdogan while (ce) { 1438dec214d0STahsin Erdogan ea_inode = ext4_iget(inode->i_sb, ce->e_value); 1439dec214d0STahsin Erdogan if (!IS_ERR(ea_inode) && 1440dec214d0STahsin Erdogan !is_bad_inode(ea_inode) && 1441dec214d0STahsin Erdogan (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && 1442dec214d0STahsin Erdogan i_size_read(ea_inode) == value_len && 1443dec214d0STahsin Erdogan !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && 1444b9fc761eSTahsin Erdogan !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, 1445dec214d0STahsin Erdogan value_len) && 1446dec214d0STahsin Erdogan !memcmp(value, ea_data, value_len)) { 1447dec214d0STahsin Erdogan mb_cache_entry_touch(ea_inode_cache, ce); 1448dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1449dec214d0STahsin Erdogan kvfree(ea_data); 1450dec214d0STahsin Erdogan return ea_inode; 1451dec214d0STahsin Erdogan } 1452dec214d0STahsin Erdogan 1453dec214d0STahsin Erdogan if (!IS_ERR(ea_inode)) 1454e50e5129SAndreas Dilger iput(ea_inode); 1455dec214d0STahsin Erdogan ce = mb_cache_entry_find_next(ea_inode_cache, ce); 1456dec214d0STahsin Erdogan } 1457dec214d0STahsin Erdogan kvfree(ea_data); 1458dec214d0STahsin Erdogan return NULL; 1459e50e5129SAndreas Dilger } 1460e50e5129SAndreas Dilger 1461e50e5129SAndreas Dilger /* 1462e50e5129SAndreas Dilger * Add value of the EA in an inode. 1463e50e5129SAndreas Dilger */ 1464dec214d0STahsin Erdogan static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, 1465dec214d0STahsin Erdogan const void *value, size_t value_len, 1466dec214d0STahsin Erdogan struct inode **ret_inode) 1467e50e5129SAndreas Dilger { 1468e50e5129SAndreas Dilger struct inode *ea_inode; 1469dec214d0STahsin Erdogan u32 hash; 1470e50e5129SAndreas Dilger int err; 1471e50e5129SAndreas Dilger 1472dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); 1473dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); 1474dec214d0STahsin Erdogan if (ea_inode) { 1475dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1476dec214d0STahsin Erdogan if (err) { 1477dec214d0STahsin Erdogan iput(ea_inode); 1478dec214d0STahsin Erdogan return err; 1479dec214d0STahsin Erdogan } 1480dec214d0STahsin Erdogan 1481dec214d0STahsin Erdogan *ret_inode = ea_inode; 1482dec214d0STahsin Erdogan return 0; 1483dec214d0STahsin Erdogan } 1484dec214d0STahsin Erdogan 1485e50e5129SAndreas Dilger /* Create an inode for the EA value */ 1486dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_create(handle, inode, hash); 1487e50e5129SAndreas Dilger if (IS_ERR(ea_inode)) 1488e50e5129SAndreas Dilger return PTR_ERR(ea_inode); 1489e50e5129SAndreas Dilger 1490e50e5129SAndreas Dilger err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); 1491dec214d0STahsin Erdogan if (err) { 1492dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref(handle, ea_inode); 1493e50e5129SAndreas Dilger iput(ea_inode); 1494e50e5129SAndreas Dilger return err; 1495e50e5129SAndreas Dilger } 1496e50e5129SAndreas Dilger 1497cdb7ee4cSTahsin Erdogan if (EA_INODE_CACHE(inode)) 1498dec214d0STahsin Erdogan mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, 1499dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 1500dec214d0STahsin Erdogan 1501dec214d0STahsin Erdogan *ret_inode = ea_inode; 1502dec214d0STahsin Erdogan return 0; 1503dec214d0STahsin Erdogan } 1504dec214d0STahsin Erdogan 15059c6e7853STahsin Erdogan /* 15069c6e7853STahsin Erdogan * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode 15079c6e7853STahsin Erdogan * feature is enabled. 15089c6e7853STahsin Erdogan */ 15099c6e7853STahsin Erdogan #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) 15109c6e7853STahsin Erdogan 1511e50e5129SAndreas Dilger static int ext4_xattr_set_entry(struct ext4_xattr_info *i, 1512e50e5129SAndreas Dilger struct ext4_xattr_search *s, 1513daf83281STahsin Erdogan handle_t *handle, struct inode *inode, 1514daf83281STahsin Erdogan bool is_block) 1515ac27a0ecSDave Kleikamp { 1516617ba13bSMingming Cao struct ext4_xattr_entry *last; 1517dec214d0STahsin Erdogan struct ext4_xattr_entry *here = s->here; 1518dec214d0STahsin Erdogan size_t min_offs = s->end - s->base, name_len = strlen(i->name); 1519e50e5129SAndreas Dilger int in_inode = i->in_inode; 1520dec214d0STahsin Erdogan struct inode *old_ea_inode = NULL; 1521dec214d0STahsin Erdogan struct inode *new_ea_inode = NULL; 1522dec214d0STahsin Erdogan size_t old_size, new_size; 1523dec214d0STahsin Erdogan int ret; 1524dec214d0STahsin Erdogan 1525dec214d0STahsin Erdogan /* Space used by old and new values. */ 1526dec214d0STahsin Erdogan old_size = (!s->not_found && !here->e_value_inum) ? 1527dec214d0STahsin Erdogan EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; 1528dec214d0STahsin Erdogan new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; 1529dec214d0STahsin Erdogan 1530dec214d0STahsin Erdogan /* 1531dec214d0STahsin Erdogan * Optimization for the simple case when old and new values have the 1532dec214d0STahsin Erdogan * same padded sizes. Not applicable if external inodes are involved. 1533dec214d0STahsin Erdogan */ 1534dec214d0STahsin Erdogan if (new_size && new_size == old_size) { 1535dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1536dec214d0STahsin Erdogan void *val = s->base + offs; 1537dec214d0STahsin Erdogan 1538dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1539dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1540dec214d0STahsin Erdogan memset(val, 0, new_size); 1541dec214d0STahsin Erdogan } else { 1542dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1543dec214d0STahsin Erdogan /* Clear padding bytes. */ 1544dec214d0STahsin Erdogan memset(val + i->value_len, 0, new_size - i->value_len); 1545dec214d0STahsin Erdogan } 1546dec214d0STahsin Erdogan return 0; 1547dec214d0STahsin Erdogan } 1548e50e5129SAndreas Dilger 1549ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 1550ac27a0ecSDave Kleikamp last = s->first; 1551617ba13bSMingming Cao for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1552e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 1553ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 1554ac27a0ecSDave Kleikamp if (offs < min_offs) 1555ac27a0ecSDave Kleikamp min_offs = offs; 1556ac27a0ecSDave Kleikamp } 1557ac27a0ecSDave Kleikamp } 1558dec214d0STahsin Erdogan 1559dec214d0STahsin Erdogan /* Check whether we have enough space. */ 1560ac27a0ecSDave Kleikamp if (i->value) { 1561dec214d0STahsin Erdogan size_t free; 1562e50e5129SAndreas Dilger 1563dec214d0STahsin Erdogan free = min_offs - ((void *)last - s->base) - sizeof(__u32); 1564dec214d0STahsin Erdogan if (!s->not_found) 1565dec214d0STahsin Erdogan free += EXT4_XATTR_LEN(name_len) + old_size; 1566e50e5129SAndreas Dilger 1567dec214d0STahsin Erdogan if (free < EXT4_XATTR_LEN(name_len) + new_size) { 1568dec214d0STahsin Erdogan ret = -ENOSPC; 1569dec214d0STahsin Erdogan goto out; 1570dec214d0STahsin Erdogan } 15719c6e7853STahsin Erdogan 15729c6e7853STahsin Erdogan /* 15739c6e7853STahsin Erdogan * If storing the value in an external inode is an option, 15749c6e7853STahsin Erdogan * reserve space for xattr entries/names in the external 15759c6e7853STahsin Erdogan * attribute block so that a long value does not occupy the 15769c6e7853STahsin Erdogan * whole space and prevent futher entries being added. 15779c6e7853STahsin Erdogan */ 1578daf83281STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 1579daf83281STahsin Erdogan new_size && is_block && 15809c6e7853STahsin Erdogan (min_offs + old_size - new_size) < 15819c6e7853STahsin Erdogan EXT4_XATTR_BLOCK_RESERVE(inode)) { 15829c6e7853STahsin Erdogan ret = -ENOSPC; 15839c6e7853STahsin Erdogan goto out; 15849c6e7853STahsin Erdogan } 1585ac27a0ecSDave Kleikamp } 1586ac27a0ecSDave Kleikamp 1587dec214d0STahsin Erdogan /* 1588dec214d0STahsin Erdogan * Getting access to old and new ea inodes is subject to failures. 1589dec214d0STahsin Erdogan * Finish that work before doing any modifications to the xattr data. 1590dec214d0STahsin Erdogan */ 1591dec214d0STahsin Erdogan if (!s->not_found && here->e_value_inum) { 1592dec214d0STahsin Erdogan ret = ext4_xattr_inode_iget(inode, 1593dec214d0STahsin Erdogan le32_to_cpu(here->e_value_inum), 1594dec214d0STahsin Erdogan &old_ea_inode); 1595dec214d0STahsin Erdogan if (ret) { 1596dec214d0STahsin Erdogan old_ea_inode = NULL; 1597dec214d0STahsin Erdogan goto out; 1598bd9926e8STheodore Ts'o } 1599dec214d0STahsin Erdogan } 1600dec214d0STahsin Erdogan if (i->value && in_inode) { 1601dec214d0STahsin Erdogan WARN_ON_ONCE(!i->value_len); 1602dec214d0STahsin Erdogan 1603dec214d0STahsin Erdogan ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); 1604dec214d0STahsin Erdogan if (ret) 1605dec214d0STahsin Erdogan goto out; 1606dec214d0STahsin Erdogan 1607dec214d0STahsin Erdogan ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, 1608dec214d0STahsin Erdogan i->value_len, 1609dec214d0STahsin Erdogan &new_ea_inode); 1610dec214d0STahsin Erdogan if (ret) { 1611dec214d0STahsin Erdogan new_ea_inode = NULL; 1612dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, i->value_len); 1613dec214d0STahsin Erdogan goto out; 1614dec214d0STahsin Erdogan } 1615ac27a0ecSDave Kleikamp } 1616ac27a0ecSDave Kleikamp 1617dec214d0STahsin Erdogan if (old_ea_inode) { 1618dec214d0STahsin Erdogan /* We are ready to release ref count on the old_ea_inode. */ 1619dec214d0STahsin Erdogan ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); 1620dec214d0STahsin Erdogan if (ret) { 1621dec214d0STahsin Erdogan /* Release newly required ref count on new_ea_inode. */ 1622dec214d0STahsin Erdogan if (new_ea_inode) { 1623dec214d0STahsin Erdogan int err; 1624dec214d0STahsin Erdogan 1625dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, 1626dec214d0STahsin Erdogan new_ea_inode); 1627dec214d0STahsin Erdogan if (err) 1628dec214d0STahsin Erdogan ext4_warning_inode(new_ea_inode, 1629dec214d0STahsin Erdogan "dec ref new_ea_inode err=%d", 1630dec214d0STahsin Erdogan err); 1631dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 1632dec214d0STahsin Erdogan i->value_len); 1633dec214d0STahsin Erdogan } 1634dec214d0STahsin Erdogan goto out; 1635dec214d0STahsin Erdogan } 1636dec214d0STahsin Erdogan 1637dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 1638dec214d0STahsin Erdogan le32_to_cpu(here->e_value_size)); 1639dec214d0STahsin Erdogan } 1640dec214d0STahsin Erdogan 1641dec214d0STahsin Erdogan /* No failures allowed past this point. */ 1642dec214d0STahsin Erdogan 1643dec214d0STahsin Erdogan if (!s->not_found && here->e_value_offs) { 1644ac27a0ecSDave Kleikamp /* Remove the old value. */ 1645dec214d0STahsin Erdogan void *first_val = s->base + min_offs; 1646dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1647dec214d0STahsin Erdogan void *val = s->base + offs; 1648dec214d0STahsin Erdogan 1649dec214d0STahsin Erdogan memmove(first_val + old_size, first_val, val - first_val); 1650dec214d0STahsin Erdogan memset(first_val, 0, old_size); 1651dec214d0STahsin Erdogan min_offs += old_size; 1652ac27a0ecSDave Kleikamp 1653ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 1654ac27a0ecSDave Kleikamp last = s->first; 1655ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 1656ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 1657dec214d0STahsin Erdogan 1658e50e5129SAndreas Dilger if (!last->e_value_inum && 1659e50e5129SAndreas Dilger last->e_value_size && o < offs) 1660dec214d0STahsin Erdogan last->e_value_offs = cpu_to_le16(o + old_size); 1661617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 1662ac27a0ecSDave Kleikamp } 1663ac27a0ecSDave Kleikamp } 1664dec214d0STahsin Erdogan 1665ac27a0ecSDave Kleikamp if (!i->value) { 1666dec214d0STahsin Erdogan /* Remove old name. */ 1667617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 1668dec214d0STahsin Erdogan 1669ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 1670dec214d0STahsin Erdogan memmove(here, (void *)here + size, 1671dec214d0STahsin Erdogan (void *)last - (void *)here + sizeof(__u32)); 1672ac27a0ecSDave Kleikamp memset(last, 0, size); 1673dec214d0STahsin Erdogan } else if (s->not_found) { 1674dec214d0STahsin Erdogan /* Insert new name. */ 1675dec214d0STahsin Erdogan size_t size = EXT4_XATTR_LEN(name_len); 1676dec214d0STahsin Erdogan size_t rest = (void *)last - (void *)here + sizeof(__u32); 1677dec214d0STahsin Erdogan 1678dec214d0STahsin Erdogan memmove((void *)here + size, here, rest); 1679dec214d0STahsin Erdogan memset(here, 0, size); 1680dec214d0STahsin Erdogan here->e_name_index = i->name_index; 1681dec214d0STahsin Erdogan here->e_name_len = name_len; 1682dec214d0STahsin Erdogan memcpy(here->e_name, i->name, name_len); 1683dec214d0STahsin Erdogan } else { 1684dec214d0STahsin Erdogan /* This is an update, reset value info. */ 1685dec214d0STahsin Erdogan here->e_value_inum = 0; 1686dec214d0STahsin Erdogan here->e_value_offs = 0; 1687dec214d0STahsin Erdogan here->e_value_size = 0; 1688ac27a0ecSDave Kleikamp } 1689ac27a0ecSDave Kleikamp 1690ac27a0ecSDave Kleikamp if (i->value) { 1691dec214d0STahsin Erdogan /* Insert new value. */ 1692e50e5129SAndreas Dilger if (in_inode) { 1693dec214d0STahsin Erdogan here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); 1694e50e5129SAndreas Dilger } else if (i->value_len) { 1695dec214d0STahsin Erdogan void *val = s->base + min_offs - new_size; 1696e50e5129SAndreas Dilger 1697dec214d0STahsin Erdogan here->e_value_offs = cpu_to_le16(min_offs - new_size); 1698dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1699dec214d0STahsin Erdogan memset(val, 0, new_size); 1700dec214d0STahsin Erdogan } else { 1701dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1702dec214d0STahsin Erdogan /* Clear padding bytes. */ 1703dec214d0STahsin Erdogan memset(val + i->value_len, 0, 1704dec214d0STahsin Erdogan new_size - i->value_len); 1705dec214d0STahsin Erdogan } 1706dec214d0STahsin Erdogan } 1707dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1708dec214d0STahsin Erdogan } 1709daf83281STahsin Erdogan 1710b9fc761eSTahsin Erdogan if (i->value) { 1711b9fc761eSTahsin Erdogan __le32 hash = 0; 1712b9fc761eSTahsin Erdogan 1713b9fc761eSTahsin Erdogan /* Entry hash calculation. */ 1714b9fc761eSTahsin Erdogan if (in_inode) { 1715b9fc761eSTahsin Erdogan __le32 crc32c_hash; 1716b9fc761eSTahsin Erdogan 1717b9fc761eSTahsin Erdogan /* 1718b9fc761eSTahsin Erdogan * Feed crc32c hash instead of the raw value for entry 1719b9fc761eSTahsin Erdogan * hash calculation. This is to avoid walking 1720b9fc761eSTahsin Erdogan * potentially long value buffer again. 1721b9fc761eSTahsin Erdogan */ 1722b9fc761eSTahsin Erdogan crc32c_hash = cpu_to_le32( 1723b9fc761eSTahsin Erdogan ext4_xattr_inode_get_hash(new_ea_inode)); 1724b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1725b9fc761eSTahsin Erdogan here->e_name_len, 1726b9fc761eSTahsin Erdogan &crc32c_hash, 1); 1727b9fc761eSTahsin Erdogan } else if (is_block) { 1728b9fc761eSTahsin Erdogan __le32 *value = s->base + min_offs - new_size; 1729b9fc761eSTahsin Erdogan 1730b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1731b9fc761eSTahsin Erdogan here->e_name_len, value, 1732b9fc761eSTahsin Erdogan new_size >> 2); 1733daf83281STahsin Erdogan } 1734b9fc761eSTahsin Erdogan here->e_hash = hash; 1735b9fc761eSTahsin Erdogan } 1736b9fc761eSTahsin Erdogan 1737b9fc761eSTahsin Erdogan if (is_block) 1738b9fc761eSTahsin Erdogan ext4_xattr_rehash((struct ext4_xattr_header *)s->base); 1739daf83281STahsin Erdogan 1740dec214d0STahsin Erdogan ret = 0; 1741e50e5129SAndreas Dilger out: 1742dec214d0STahsin Erdogan iput(old_ea_inode); 1743dec214d0STahsin Erdogan iput(new_ea_inode); 1744dec214d0STahsin Erdogan return ret; 1745ac27a0ecSDave Kleikamp } 1746ac27a0ecSDave Kleikamp 1747617ba13bSMingming Cao struct ext4_xattr_block_find { 1748617ba13bSMingming Cao struct ext4_xattr_search s; 1749ac27a0ecSDave Kleikamp struct buffer_head *bh; 1750ac27a0ecSDave Kleikamp }; 1751ac27a0ecSDave Kleikamp 1752ac27a0ecSDave Kleikamp static int 1753617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 1754617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1755ac27a0ecSDave Kleikamp { 1756ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1757ac27a0ecSDave Kleikamp int error; 1758ac27a0ecSDave Kleikamp 1759ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 1760ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 1761ac27a0ecSDave Kleikamp 1762617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 1763ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 1764617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 1765ac27a0ecSDave Kleikamp error = -EIO; 1766ac27a0ecSDave Kleikamp if (!bs->bh) 1767ac27a0ecSDave Kleikamp goto cleanup; 1768ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 1769ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 1770ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 1771cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bs->bh)) { 177224676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 177324676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 17746a797d27SDarrick J. Wong error = -EFSCORRUPTED; 1775ac27a0ecSDave Kleikamp goto cleanup; 1776ac27a0ecSDave Kleikamp } 1777ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1778ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 1779ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 1780ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 1781ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 1782617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 17836ba644b9SEric Biggers i->name, 1); 1784ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1785ac27a0ecSDave Kleikamp goto cleanup; 1786ac27a0ecSDave Kleikamp bs->s.not_found = error; 1787ac27a0ecSDave Kleikamp } 1788ac27a0ecSDave Kleikamp error = 0; 1789ac27a0ecSDave Kleikamp 1790ac27a0ecSDave Kleikamp cleanup: 1791ac27a0ecSDave Kleikamp return error; 1792ac27a0ecSDave Kleikamp } 1793ac27a0ecSDave Kleikamp 1794ac27a0ecSDave Kleikamp static int 1795617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 1796617ba13bSMingming Cao struct ext4_xattr_info *i, 1797617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1798ac27a0ecSDave Kleikamp { 1799ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1800ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 1801b347e2bcSTahsin Erdogan struct ext4_xattr_search s_copy = bs->s; 1802b347e2bcSTahsin Erdogan struct ext4_xattr_search *s = &s_copy; 18037a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 18048a2bfdcbSMingming Cao int error = 0; 180547387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 1806dec214d0STahsin Erdogan struct inode *ea_inode = NULL; 1807dec214d0STahsin Erdogan size_t old_ea_inode_size = 0; 1808ac27a0ecSDave Kleikamp 1809617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 1810ac27a0ecSDave Kleikamp 1811ac27a0ecSDave Kleikamp if (s->base) { 18125d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 18138a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 18148a2bfdcbSMingming Cao if (error) 18158a2bfdcbSMingming Cao goto cleanup; 18168a2bfdcbSMingming Cao lock_buffer(bs->bh); 18178a2bfdcbSMingming Cao 1818ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 181982939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 182082939d79SJan Kara 182182939d79SJan Kara /* 182282939d79SJan Kara * This must happen under buffer lock for 182382939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 182482939d79SJan Kara * block 182582939d79SJan Kara */ 1826cdb7ee4cSTahsin Erdogan if (ea_block_cache) 182747387409STahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, 182882939d79SJan Kara bs->bh->b_blocknr); 1829ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 1830daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 1831daf83281STahsin Erdogan true /* is_block */); 1832dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bs->bh); 1833ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 18346a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1835ac27a0ecSDave Kleikamp goto bad_block; 1836ac27a0ecSDave Kleikamp if (!error) 1837dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 18380390131bSFrank Mayhar inode, 1839ac27a0ecSDave Kleikamp bs->bh); 1840ac27a0ecSDave Kleikamp if (error) 1841ac27a0ecSDave Kleikamp goto cleanup; 1842ac27a0ecSDave Kleikamp goto inserted; 1843ac27a0ecSDave Kleikamp } else { 1844ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 1845ac27a0ecSDave Kleikamp 18468a2bfdcbSMingming Cao unlock_buffer(bs->bh); 1847ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 1848216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 1849ac27a0ecSDave Kleikamp error = -ENOMEM; 1850ac27a0ecSDave Kleikamp if (s->base == NULL) 1851ac27a0ecSDave Kleikamp goto cleanup; 1852ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 1853ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1854ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1855ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 1856ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 1857dec214d0STahsin Erdogan 1858dec214d0STahsin Erdogan /* 1859dec214d0STahsin Erdogan * If existing entry points to an xattr inode, we need 1860dec214d0STahsin Erdogan * to prevent ext4_xattr_set_entry() from decrementing 1861dec214d0STahsin Erdogan * ref count on it because the reference belongs to the 1862dec214d0STahsin Erdogan * original block. In this case, make the entry look 1863dec214d0STahsin Erdogan * like it has an empty value. 1864dec214d0STahsin Erdogan */ 1865dec214d0STahsin Erdogan if (!s->not_found && s->here->e_value_inum) { 1866dec214d0STahsin Erdogan /* 1867dec214d0STahsin Erdogan * Defer quota free call for previous inode 1868dec214d0STahsin Erdogan * until success is guaranteed. 1869dec214d0STahsin Erdogan */ 1870dec214d0STahsin Erdogan old_ea_inode_size = le32_to_cpu( 1871dec214d0STahsin Erdogan s->here->e_value_size); 1872dec214d0STahsin Erdogan s->here->e_value_inum = 0; 1873dec214d0STahsin Erdogan s->here->e_value_size = 0; 1874dec214d0STahsin Erdogan } 1875ac27a0ecSDave Kleikamp } 1876ac27a0ecSDave Kleikamp } else { 1877ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 1878216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 1879ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 1880ac27a0ecSDave Kleikamp error = -ENOMEM; 1881ac27a0ecSDave Kleikamp if (s->base == NULL) 1882ac27a0ecSDave Kleikamp goto cleanup; 1883617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 1884ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 1885ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1886ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1887ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 1888ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 1889ac27a0ecSDave Kleikamp } 1890ac27a0ecSDave Kleikamp 1891daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); 18926a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1893ac27a0ecSDave Kleikamp goto bad_block; 1894ac27a0ecSDave Kleikamp if (error) 1895ac27a0ecSDave Kleikamp goto cleanup; 1896dec214d0STahsin Erdogan 1897dec214d0STahsin Erdogan if (i->value && s->here->e_value_inum) { 1898dec214d0STahsin Erdogan unsigned int ea_ino; 1899dec214d0STahsin Erdogan 1900dec214d0STahsin Erdogan /* 1901dec214d0STahsin Erdogan * A ref count on ea_inode has been taken as part of the call to 1902dec214d0STahsin Erdogan * ext4_xattr_set_entry() above. We would like to drop this 1903dec214d0STahsin Erdogan * extra ref but we have to wait until the xattr block is 1904dec214d0STahsin Erdogan * initialized and has its own ref count on the ea_inode. 1905dec214d0STahsin Erdogan */ 1906dec214d0STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 1907dec214d0STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, &ea_inode); 1908dec214d0STahsin Erdogan if (error) { 1909dec214d0STahsin Erdogan ea_inode = NULL; 1910dec214d0STahsin Erdogan goto cleanup; 1911dec214d0STahsin Erdogan } 1912dec214d0STahsin Erdogan } 1913dec214d0STahsin Erdogan 1914ac27a0ecSDave Kleikamp inserted: 1915ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 191647387409STahsin Erdogan new_bh = ext4_xattr_block_cache_find(inode, header(s->base), 191747387409STahsin Erdogan &ce); 1918ac27a0ecSDave Kleikamp if (new_bh) { 1919ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 1920ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 1921ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 1922ac27a0ecSDave Kleikamp else { 19236048c64bSAndreas Gruenbacher u32 ref; 19246048c64bSAndreas Gruenbacher 1925b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 1926b8cb5a54STahsin Erdogan 1927ac27a0ecSDave Kleikamp /* The old block is released after updating 1928ac27a0ecSDave Kleikamp the inode. */ 19291231b3a1SLukas Czerner error = dquot_alloc_block(inode, 19301231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 19315dd4056dSChristoph Hellwig if (error) 1932ac27a0ecSDave Kleikamp goto cleanup; 19335d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 1934617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 1935ac27a0ecSDave Kleikamp new_bh); 1936ac27a0ecSDave Kleikamp if (error) 1937ac27a0ecSDave Kleikamp goto cleanup_dquot; 1938ac27a0ecSDave Kleikamp lock_buffer(new_bh); 193982939d79SJan Kara /* 194082939d79SJan Kara * We have to be careful about races with 19416048c64bSAndreas Gruenbacher * freeing, rehashing or adding references to 19426048c64bSAndreas Gruenbacher * xattr block. Once we hold buffer lock xattr 19436048c64bSAndreas Gruenbacher * block's state is stable so we can check 19446048c64bSAndreas Gruenbacher * whether the block got freed / rehashed or 19456048c64bSAndreas Gruenbacher * not. Since we unhash mbcache entry under 19466048c64bSAndreas Gruenbacher * buffer lock when freeing / rehashing xattr 19476048c64bSAndreas Gruenbacher * block, checking whether entry is still 19486048c64bSAndreas Gruenbacher * hashed is reliable. Same rules hold for 19496048c64bSAndreas Gruenbacher * e_reusable handling. 195082939d79SJan Kara */ 19516048c64bSAndreas Gruenbacher if (hlist_bl_unhashed(&ce->e_hash_list) || 19526048c64bSAndreas Gruenbacher !ce->e_reusable) { 195382939d79SJan Kara /* 195482939d79SJan Kara * Undo everything and check mbcache 195582939d79SJan Kara * again. 195682939d79SJan Kara */ 195782939d79SJan Kara unlock_buffer(new_bh); 195882939d79SJan Kara dquot_free_block(inode, 195982939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 196082939d79SJan Kara 1)); 196182939d79SJan Kara brelse(new_bh); 196247387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 196382939d79SJan Kara ce = NULL; 196482939d79SJan Kara new_bh = NULL; 196582939d79SJan Kara goto inserted; 196682939d79SJan Kara } 19676048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 19686048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 19696048c64bSAndreas Gruenbacher if (ref >= EXT4_XATTR_REFCOUNT_MAX) 19706048c64bSAndreas Gruenbacher ce->e_reusable = 0; 1971ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 19726048c64bSAndreas Gruenbacher ref); 1973dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 1974ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 1975dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 19760390131bSFrank Mayhar inode, 1977ac27a0ecSDave Kleikamp new_bh); 1978ac27a0ecSDave Kleikamp if (error) 1979ac27a0ecSDave Kleikamp goto cleanup_dquot; 1980ac27a0ecSDave Kleikamp } 198147387409STahsin Erdogan mb_cache_entry_touch(ea_block_cache, ce); 198247387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 1983ac27a0ecSDave Kleikamp ce = NULL; 1984ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 1985ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 1986ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 1987ec000220STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); 1988ac27a0ecSDave Kleikamp new_bh = bs->bh; 1989ac27a0ecSDave Kleikamp get_bh(new_bh); 1990ac27a0ecSDave Kleikamp } else { 1991ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 1992fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 1993fb0a387dSEric Sandeen 1994b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 1995b8cb5a54STahsin Erdogan 1996fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 1997d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 1998fb0a387dSEric Sandeen 1999fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 200012e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 2001fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 2002fb0a387dSEric Sandeen 200355f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 200455f020dbSAllison Henderson NULL, &error); 2005ac27a0ecSDave Kleikamp if (error) 2006ac27a0ecSDave Kleikamp goto cleanup; 2007fb0a387dSEric Sandeen 200812e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 2009fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 2010fb0a387dSEric Sandeen 2011ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 2012ace36ad4SJoe Perches (unsigned long long)block); 2013ac27a0ecSDave Kleikamp 2014ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 2015aebf0243SWang Shilong if (unlikely(!new_bh)) { 2016860d21e2STheodore Ts'o error = -ENOMEM; 2017ac27a0ecSDave Kleikamp getblk_failed: 20187dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 2019e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 2020ac27a0ecSDave Kleikamp goto cleanup; 2021ac27a0ecSDave Kleikamp } 2022dec214d0STahsin Erdogan error = ext4_xattr_inode_inc_ref_all(handle, inode, 2023dec214d0STahsin Erdogan ENTRY(header(s->base)+1)); 2024dec214d0STahsin Erdogan if (error) 2025dec214d0STahsin Erdogan goto getblk_failed; 2026dec214d0STahsin Erdogan if (ea_inode) { 2027dec214d0STahsin Erdogan /* Drop the extra ref on ea_inode. */ 2028dec214d0STahsin Erdogan error = ext4_xattr_inode_dec_ref(handle, 2029dec214d0STahsin Erdogan ea_inode); 2030dec214d0STahsin Erdogan if (error) 2031dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 2032dec214d0STahsin Erdogan "dec ref error=%d", 2033dec214d0STahsin Erdogan error); 2034dec214d0STahsin Erdogan iput(ea_inode); 2035dec214d0STahsin Erdogan ea_inode = NULL; 2036dec214d0STahsin Erdogan } 2037dec214d0STahsin Erdogan 2038ac27a0ecSDave Kleikamp lock_buffer(new_bh); 2039617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 2040ac27a0ecSDave Kleikamp if (error) { 2041ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2042860d21e2STheodore Ts'o error = -EIO; 2043ac27a0ecSDave Kleikamp goto getblk_failed; 2044ac27a0ecSDave Kleikamp } 2045ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 2046dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2047ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 2048ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 204947387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, new_bh); 2050dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, 2051dac7a4b4STheodore Ts'o new_bh); 2052ac27a0ecSDave Kleikamp if (error) 2053ac27a0ecSDave Kleikamp goto cleanup; 2054ac27a0ecSDave Kleikamp } 2055ac27a0ecSDave Kleikamp } 2056ac27a0ecSDave Kleikamp 2057dec214d0STahsin Erdogan if (old_ea_inode_size) 2058dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, old_ea_inode_size); 2059dec214d0STahsin Erdogan 2060ac27a0ecSDave Kleikamp /* Update the inode. */ 2061617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 2062ac27a0ecSDave Kleikamp 2063ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 2064dec214d0STahsin Erdogan if (bs->bh && bs->bh != new_bh) { 2065dec214d0STahsin Erdogan struct ext4_xattr_inode_array *ea_inode_array = NULL; 2066dec214d0STahsin Erdogan 2067dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bs->bh, 2068dec214d0STahsin Erdogan &ea_inode_array, 2069dec214d0STahsin Erdogan 0 /* extra_credits */); 2070dec214d0STahsin Erdogan ext4_xattr_inode_array_free(ea_inode_array); 2071dec214d0STahsin Erdogan } 2072ac27a0ecSDave Kleikamp error = 0; 2073ac27a0ecSDave Kleikamp 2074ac27a0ecSDave Kleikamp cleanup: 2075dec214d0STahsin Erdogan if (ea_inode) { 2076dec214d0STahsin Erdogan int error2; 2077dec214d0STahsin Erdogan 2078dec214d0STahsin Erdogan error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); 2079dec214d0STahsin Erdogan if (error2) 2080dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "dec ref error=%d", 2081dec214d0STahsin Erdogan error2); 2082dec214d0STahsin Erdogan 2083dec214d0STahsin Erdogan /* If there was an error, revert the quota charge. */ 2084dec214d0STahsin Erdogan if (error) 2085dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 2086dec214d0STahsin Erdogan i_size_read(ea_inode)); 2087dec214d0STahsin Erdogan iput(ea_inode); 2088dec214d0STahsin Erdogan } 2089ac27a0ecSDave Kleikamp if (ce) 209047387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2091ac27a0ecSDave Kleikamp brelse(new_bh); 2092ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 2093ac27a0ecSDave Kleikamp kfree(s->base); 2094ac27a0ecSDave Kleikamp 2095ac27a0ecSDave Kleikamp return error; 2096ac27a0ecSDave Kleikamp 2097ac27a0ecSDave Kleikamp cleanup_dquot: 20981231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 2099ac27a0ecSDave Kleikamp goto cleanup; 2100ac27a0ecSDave Kleikamp 2101ac27a0ecSDave Kleikamp bad_block: 210224676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 210324676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2104ac27a0ecSDave Kleikamp goto cleanup; 2105ac27a0ecSDave Kleikamp 2106ac27a0ecSDave Kleikamp #undef header 2107ac27a0ecSDave Kleikamp } 2108ac27a0ecSDave Kleikamp 2109879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 2110617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2111ac27a0ecSDave Kleikamp { 2112617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2113617ba13bSMingming Cao struct ext4_inode *raw_inode; 2114ac27a0ecSDave Kleikamp int error; 2115ac27a0ecSDave Kleikamp 2116617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 2117ac27a0ecSDave Kleikamp return 0; 2118617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 2119ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 2120ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 2121ac27a0ecSDave Kleikamp is->s.here = is->s.first; 2122617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 212319f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 21249e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 2125ac27a0ecSDave Kleikamp if (error) 2126ac27a0ecSDave Kleikamp return error; 2127ac27a0ecSDave Kleikamp /* Find the named attribute. */ 2128617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 21296ba644b9SEric Biggers i->name, 0); 2130ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 2131ac27a0ecSDave Kleikamp return error; 2132ac27a0ecSDave Kleikamp is->s.not_found = error; 2133ac27a0ecSDave Kleikamp } 2134ac27a0ecSDave Kleikamp return 0; 2135ac27a0ecSDave Kleikamp } 2136ac27a0ecSDave Kleikamp 21370d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 21380d812f77STao Ma struct ext4_xattr_info *i, 21390d812f77STao Ma struct ext4_xattr_ibody_find *is) 21400d812f77STao Ma { 21410d812f77STao Ma struct ext4_xattr_ibody_header *header; 21420d812f77STao Ma struct ext4_xattr_search *s = &is->s; 21430d812f77STao Ma int error; 21440d812f77STao Ma 21450d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 21460d812f77STao Ma return -ENOSPC; 2147daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 21480d812f77STao Ma if (error) { 21490d812f77STao Ma if (error == -ENOSPC && 21500d812f77STao Ma ext4_has_inline_data(inode)) { 21510d812f77STao Ma error = ext4_try_to_evict_inline_data(handle, inode, 21520d812f77STao Ma EXT4_XATTR_LEN(strlen(i->name) + 21530d812f77STao Ma EXT4_XATTR_SIZE(i->value_len))); 21540d812f77STao Ma if (error) 21550d812f77STao Ma return error; 21560d812f77STao Ma error = ext4_xattr_ibody_find(inode, i, is); 21570d812f77STao Ma if (error) 21580d812f77STao Ma return error; 2159daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 2160daf83281STahsin Erdogan false /* is_block */); 21610d812f77STao Ma } 21620d812f77STao Ma if (error) 21630d812f77STao Ma return error; 21640d812f77STao Ma } 21650d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 21660d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 21670d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 21680d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 21690d812f77STao Ma } else { 21700d812f77STao Ma header->h_magic = cpu_to_le32(0); 21710d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 21720d812f77STao Ma } 21730d812f77STao Ma return 0; 21740d812f77STao Ma } 21750d812f77STao Ma 2176e50e5129SAndreas Dilger static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 2177617ba13bSMingming Cao struct ext4_xattr_info *i, 2178617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2179ac27a0ecSDave Kleikamp { 2180617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2181617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 2182ac27a0ecSDave Kleikamp int error; 2183ac27a0ecSDave Kleikamp 2184617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 2185ac27a0ecSDave Kleikamp return -ENOSPC; 2186daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 2187ac27a0ecSDave Kleikamp if (error) 2188ac27a0ecSDave Kleikamp return error; 2189617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 2190ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 2191617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 219219f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 2193ac27a0ecSDave Kleikamp } else { 2194ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 219519f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 2196ac27a0ecSDave Kleikamp } 2197ac27a0ecSDave Kleikamp return 0; 2198ac27a0ecSDave Kleikamp } 2199ac27a0ecSDave Kleikamp 22003fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 22013fd16462SJan Kara struct ext4_xattr_info *i) 22023fd16462SJan Kara { 22033fd16462SJan Kara void *value; 22043fd16462SJan Kara 22050bd454c0STahsin Erdogan /* When e_value_inum is set the value is stored externally. */ 22060bd454c0STahsin Erdogan if (s->here->e_value_inum) 22070bd454c0STahsin Erdogan return 0; 22083fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 22093fd16462SJan Kara return 0; 22103fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 22113fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 22123fd16462SJan Kara } 22133fd16462SJan Kara 2214dec214d0STahsin Erdogan static struct buffer_head *ext4_xattr_get_block(struct inode *inode) 2215dec214d0STahsin Erdogan { 2216dec214d0STahsin Erdogan struct buffer_head *bh; 2217dec214d0STahsin Erdogan int error; 2218dec214d0STahsin Erdogan 2219dec214d0STahsin Erdogan if (!EXT4_I(inode)->i_file_acl) 2220dec214d0STahsin Erdogan return NULL; 2221dec214d0STahsin Erdogan bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 2222dec214d0STahsin Erdogan if (!bh) 2223dec214d0STahsin Erdogan return ERR_PTR(-EIO); 2224dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2225dec214d0STahsin Erdogan if (error) 2226dec214d0STahsin Erdogan return ERR_PTR(error); 2227dec214d0STahsin Erdogan return bh; 2228dec214d0STahsin Erdogan } 2229dec214d0STahsin Erdogan 2230ac27a0ecSDave Kleikamp /* 2231617ba13bSMingming Cao * ext4_xattr_set_handle() 2232ac27a0ecSDave Kleikamp * 22336e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 2234ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 2235ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 2236ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 2237ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 2238ac27a0ecSDave Kleikamp * previous to the call, respectively. 2239ac27a0ecSDave Kleikamp * 2240ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2241ac27a0ecSDave Kleikamp */ 2242ac27a0ecSDave Kleikamp int 2243617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 2244ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 2245ac27a0ecSDave Kleikamp int flags) 2246ac27a0ecSDave Kleikamp { 2247617ba13bSMingming Cao struct ext4_xattr_info i = { 2248ac27a0ecSDave Kleikamp .name_index = name_index, 2249ac27a0ecSDave Kleikamp .name = name, 2250ac27a0ecSDave Kleikamp .value = value, 2251ac27a0ecSDave Kleikamp .value_len = value_len, 2252e50e5129SAndreas Dilger .in_inode = 0, 2253ac27a0ecSDave Kleikamp }; 2254617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 2255ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2256ac27a0ecSDave Kleikamp }; 2257617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 2258ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2259ac27a0ecSDave Kleikamp }; 2260c755e251STheodore Ts'o int no_expand; 2261ac27a0ecSDave Kleikamp int error; 2262ac27a0ecSDave Kleikamp 2263ac27a0ecSDave Kleikamp if (!name) 2264ac27a0ecSDave Kleikamp return -EINVAL; 2265ac27a0ecSDave Kleikamp if (strlen(name) > 255) 2266ac27a0ecSDave Kleikamp return -ERANGE; 2267b8cb5a54STahsin Erdogan 2268c755e251STheodore Ts'o ext4_write_lock_xattr(inode, &no_expand); 22694d20c685SKalpak Shah 2270c1a5d5f6STahsin Erdogan /* Check journal credits under write lock. */ 2271c1a5d5f6STahsin Erdogan if (ext4_handle_valid(handle)) { 2272dec214d0STahsin Erdogan struct buffer_head *bh; 2273c1a5d5f6STahsin Erdogan int credits; 2274c1a5d5f6STahsin Erdogan 2275dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2276dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2277dec214d0STahsin Erdogan error = PTR_ERR(bh); 2278dec214d0STahsin Erdogan goto cleanup; 2279dec214d0STahsin Erdogan } 2280dec214d0STahsin Erdogan 2281af65207cSTahsin Erdogan credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2282af65207cSTahsin Erdogan value_len, 2283af65207cSTahsin Erdogan flags & XATTR_CREATE); 2284dec214d0STahsin Erdogan brelse(bh); 2285dec214d0STahsin Erdogan 2286c1a5d5f6STahsin Erdogan if (!ext4_handle_has_enough_credits(handle, credits)) { 2287c1a5d5f6STahsin Erdogan error = -ENOSPC; 2288c1a5d5f6STahsin Erdogan goto cleanup; 2289c1a5d5f6STahsin Erdogan } 2290c1a5d5f6STahsin Erdogan } 2291c1a5d5f6STahsin Erdogan 229266543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 229386ebfd08SEric Sandeen if (error) 229486ebfd08SEric Sandeen goto cleanup; 229586ebfd08SEric Sandeen 229619f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 2297617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 2298617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 229919f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 2300ac27a0ecSDave Kleikamp } 2301ac27a0ecSDave Kleikamp 2302617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 2303ac27a0ecSDave Kleikamp if (error) 2304ac27a0ecSDave Kleikamp goto cleanup; 2305ac27a0ecSDave Kleikamp if (is.s.not_found) 2306617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 2307ac27a0ecSDave Kleikamp if (error) 2308ac27a0ecSDave Kleikamp goto cleanup; 2309ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 2310ac27a0ecSDave Kleikamp error = -ENODATA; 2311ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 2312ac27a0ecSDave Kleikamp goto cleanup; 2313ac27a0ecSDave Kleikamp error = 0; 2314ac27a0ecSDave Kleikamp if (!value) 2315ac27a0ecSDave Kleikamp goto cleanup; 2316ac27a0ecSDave Kleikamp } else { 2317ac27a0ecSDave Kleikamp error = -EEXIST; 2318ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 2319ac27a0ecSDave Kleikamp goto cleanup; 2320ac27a0ecSDave Kleikamp } 2321dec214d0STahsin Erdogan 2322ac27a0ecSDave Kleikamp if (!value) { 2323ac27a0ecSDave Kleikamp if (!is.s.not_found) 2324e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2325ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 2326617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2327ac27a0ecSDave Kleikamp } else { 23283fd16462SJan Kara error = 0; 23293fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 23303fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 23313fd16462SJan Kara goto cleanup; 23323fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 23333fd16462SJan Kara goto cleanup; 23343fd16462SJan Kara 2335b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2336b347e2bcSTahsin Erdogan (EXT4_XATTR_SIZE(i.value_len) > 2337b347e2bcSTahsin Erdogan EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) 2338b347e2bcSTahsin Erdogan i.in_inode = 1; 2339b347e2bcSTahsin Erdogan retry_inode: 2340e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2341ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 2342ac27a0ecSDave Kleikamp i.value = NULL; 2343617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2344ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 23457e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 23467e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 23477e01c8e5STiger Yang if (error) 23487e01c8e5STiger Yang goto cleanup; 23497e01c8e5STiger Yang } 2350617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2351b347e2bcSTahsin Erdogan if (!error && !is.s.not_found) { 2352ac27a0ecSDave Kleikamp i.value = NULL; 2353e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, 2354e50e5129SAndreas Dilger &is); 2355b347e2bcSTahsin Erdogan } else if (error == -ENOSPC) { 2356b347e2bcSTahsin Erdogan /* 2357b347e2bcSTahsin Erdogan * Xattr does not fit in the block, store at 2358b347e2bcSTahsin Erdogan * external inode if possible. 2359b347e2bcSTahsin Erdogan */ 2360b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2361b347e2bcSTahsin Erdogan !i.in_inode) { 2362b347e2bcSTahsin Erdogan i.in_inode = 1; 2363b347e2bcSTahsin Erdogan goto retry_inode; 2364b347e2bcSTahsin Erdogan } 2365ac27a0ecSDave Kleikamp } 2366ac27a0ecSDave Kleikamp } 2367ac27a0ecSDave Kleikamp } 2368ac27a0ecSDave Kleikamp if (!error) { 2369617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 2370eeca7ea1SDeepa Dinamani inode->i_ctime = current_time(inode); 23716dd4ee7cSKalpak Shah if (!value) 2372c755e251STheodore Ts'o no_expand = 0; 2373617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 2374ac27a0ecSDave Kleikamp /* 2375617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 2376ac27a0ecSDave Kleikamp * error != 0. 2377ac27a0ecSDave Kleikamp */ 2378ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 2379ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 23800390131bSFrank Mayhar ext4_handle_sync(handle); 2381ac27a0ecSDave Kleikamp } 2382ac27a0ecSDave Kleikamp 2383ac27a0ecSDave Kleikamp cleanup: 2384ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 2385ac27a0ecSDave Kleikamp brelse(bs.bh); 2386c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 2387ac27a0ecSDave Kleikamp return error; 2388ac27a0ecSDave Kleikamp } 2389ac27a0ecSDave Kleikamp 2390af65207cSTahsin Erdogan int ext4_xattr_set_credits(struct inode *inode, size_t value_len, 2391af65207cSTahsin Erdogan bool is_create, int *credits) 2392c1a5d5f6STahsin Erdogan { 2393dec214d0STahsin Erdogan struct buffer_head *bh; 2394dec214d0STahsin Erdogan int err; 2395c1a5d5f6STahsin Erdogan 2396dec214d0STahsin Erdogan *credits = 0; 2397dec214d0STahsin Erdogan 2398dec214d0STahsin Erdogan if (!EXT4_SB(inode->i_sb)->s_journal) 2399c1a5d5f6STahsin Erdogan return 0; 2400c1a5d5f6STahsin Erdogan 2401dec214d0STahsin Erdogan down_read(&EXT4_I(inode)->xattr_sem); 2402c1a5d5f6STahsin Erdogan 2403dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2404dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2405dec214d0STahsin Erdogan err = PTR_ERR(bh); 2406dec214d0STahsin Erdogan } else { 2407af65207cSTahsin Erdogan *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2408af65207cSTahsin Erdogan value_len, is_create); 2409dec214d0STahsin Erdogan brelse(bh); 2410dec214d0STahsin Erdogan err = 0; 2411c1a5d5f6STahsin Erdogan } 2412dec214d0STahsin Erdogan 2413dec214d0STahsin Erdogan up_read(&EXT4_I(inode)->xattr_sem); 2414dec214d0STahsin Erdogan return err; 2415c1a5d5f6STahsin Erdogan } 2416c1a5d5f6STahsin Erdogan 2417ac27a0ecSDave Kleikamp /* 2418617ba13bSMingming Cao * ext4_xattr_set() 2419ac27a0ecSDave Kleikamp * 2420617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 2421ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 2422ac27a0ecSDave Kleikamp * 2423ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2424ac27a0ecSDave Kleikamp */ 2425ac27a0ecSDave Kleikamp int 2426617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 2427ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 2428ac27a0ecSDave Kleikamp { 2429ac27a0ecSDave Kleikamp handle_t *handle; 2430e50e5129SAndreas Dilger struct super_block *sb = inode->i_sb; 2431ac27a0ecSDave Kleikamp int error, retries = 0; 2432c1a5d5f6STahsin Erdogan int credits; 2433ac27a0ecSDave Kleikamp 2434b8cb5a54STahsin Erdogan error = dquot_initialize(inode); 2435b8cb5a54STahsin Erdogan if (error) 2436b8cb5a54STahsin Erdogan return error; 2437e50e5129SAndreas Dilger 2438ac27a0ecSDave Kleikamp retry: 2439af65207cSTahsin Erdogan error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, 2440af65207cSTahsin Erdogan &credits); 2441dec214d0STahsin Erdogan if (error) 2442dec214d0STahsin Erdogan return error; 2443dec214d0STahsin Erdogan 24449924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 2445ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 2446ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 2447ac27a0ecSDave Kleikamp } else { 2448ac27a0ecSDave Kleikamp int error2; 2449ac27a0ecSDave Kleikamp 2450617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 2451ac27a0ecSDave Kleikamp value, value_len, flags); 2452617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 2453ac27a0ecSDave Kleikamp if (error == -ENOSPC && 2454e50e5129SAndreas Dilger ext4_should_retry_alloc(sb, &retries)) 2455ac27a0ecSDave Kleikamp goto retry; 2456ac27a0ecSDave Kleikamp if (error == 0) 2457ac27a0ecSDave Kleikamp error = error2; 2458ac27a0ecSDave Kleikamp } 2459ac27a0ecSDave Kleikamp 2460ac27a0ecSDave Kleikamp return error; 2461ac27a0ecSDave Kleikamp } 2462ac27a0ecSDave Kleikamp 2463ac27a0ecSDave Kleikamp /* 24646dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 24656dd4ee7cSKalpak Shah * i_extra_isize. 24666dd4ee7cSKalpak Shah */ 24676dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 24686dd4ee7cSKalpak Shah int value_offs_shift, void *to, 246994405713SJan Kara void *from, size_t n) 24706dd4ee7cSKalpak Shah { 24716dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 24726dd4ee7cSKalpak Shah int new_offs; 24736dd4ee7cSKalpak Shah 247494405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 247594405713SJan Kara BUG_ON(value_offs_shift > 0); 247694405713SJan Kara 24776dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 24786dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 2479e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 24806dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 24816dd4ee7cSKalpak Shah value_offs_shift; 24826dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 24836dd4ee7cSKalpak Shah } 24846dd4ee7cSKalpak Shah } 24856dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 24866dd4ee7cSKalpak Shah memmove(to, from, n); 24876dd4ee7cSKalpak Shah } 24886dd4ee7cSKalpak Shah 24896dd4ee7cSKalpak Shah /* 24903f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 24913f2571c1SJan Kara */ 24923f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 24933f2571c1SJan Kara struct ext4_inode *raw_inode, 24943f2571c1SJan Kara struct ext4_xattr_entry *entry) 24953f2571c1SJan Kara { 24963f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 24973f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 24983f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 2499f6109100STahsin Erdogan size_t value_size = le32_to_cpu(entry->e_value_size); 25003f2571c1SJan Kara struct ext4_xattr_info i = { 25013f2571c1SJan Kara .value = NULL, 25023f2571c1SJan Kara .value_len = 0, 25033f2571c1SJan Kara .name_index = entry->e_name_index, 2504f6109100STahsin Erdogan .in_inode = !!entry->e_value_inum, 25053f2571c1SJan Kara }; 25063f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 25073f2571c1SJan Kara int error; 25083f2571c1SJan Kara 25093f2571c1SJan Kara is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 25103f2571c1SJan Kara bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 25113f2571c1SJan Kara buffer = kmalloc(value_size, GFP_NOFS); 25123f2571c1SJan Kara b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 25133f2571c1SJan Kara if (!is || !bs || !buffer || !b_entry_name) { 25143f2571c1SJan Kara error = -ENOMEM; 25153f2571c1SJan Kara goto out; 25163f2571c1SJan Kara } 25173f2571c1SJan Kara 25183f2571c1SJan Kara is->s.not_found = -ENODATA; 25193f2571c1SJan Kara bs->s.not_found = -ENODATA; 25203f2571c1SJan Kara is->iloc.bh = NULL; 25213f2571c1SJan Kara bs->bh = NULL; 25223f2571c1SJan Kara 25233f2571c1SJan Kara /* Save the entry name and the entry value */ 2524f6109100STahsin Erdogan if (entry->e_value_inum) { 2525b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, value_size); 2526f6109100STahsin Erdogan if (error) 2527f6109100STahsin Erdogan goto out; 2528f6109100STahsin Erdogan } else { 2529f6109100STahsin Erdogan size_t value_offs = le16_to_cpu(entry->e_value_offs); 25303f2571c1SJan Kara memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); 2531f6109100STahsin Erdogan } 2532f6109100STahsin Erdogan 25333f2571c1SJan Kara memcpy(b_entry_name, entry->e_name, entry->e_name_len); 25343f2571c1SJan Kara b_entry_name[entry->e_name_len] = '\0'; 25353f2571c1SJan Kara i.name = b_entry_name; 25363f2571c1SJan Kara 25373f2571c1SJan Kara error = ext4_get_inode_loc(inode, &is->iloc); 25383f2571c1SJan Kara if (error) 25393f2571c1SJan Kara goto out; 25403f2571c1SJan Kara 25413f2571c1SJan Kara error = ext4_xattr_ibody_find(inode, &i, is); 25423f2571c1SJan Kara if (error) 25433f2571c1SJan Kara goto out; 25443f2571c1SJan Kara 25453f2571c1SJan Kara /* Remove the chosen entry from the inode */ 2546e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, is); 25473f2571c1SJan Kara if (error) 25483f2571c1SJan Kara goto out; 25493f2571c1SJan Kara 25503f2571c1SJan Kara i.value = buffer; 25513f2571c1SJan Kara i.value_len = value_size; 25523f2571c1SJan Kara error = ext4_xattr_block_find(inode, &i, bs); 25533f2571c1SJan Kara if (error) 25543f2571c1SJan Kara goto out; 25553f2571c1SJan Kara 25563f2571c1SJan Kara /* Add entry which was removed from the inode into the block */ 25573f2571c1SJan Kara error = ext4_xattr_block_set(handle, inode, &i, bs); 25583f2571c1SJan Kara if (error) 25593f2571c1SJan Kara goto out; 25603f2571c1SJan Kara error = 0; 25613f2571c1SJan Kara out: 25623f2571c1SJan Kara kfree(b_entry_name); 25633f2571c1SJan Kara kfree(buffer); 25643f2571c1SJan Kara if (is) 25653f2571c1SJan Kara brelse(is->iloc.bh); 25663f2571c1SJan Kara kfree(is); 25673f2571c1SJan Kara kfree(bs); 25683f2571c1SJan Kara 25693f2571c1SJan Kara return error; 25703f2571c1SJan Kara } 25713f2571c1SJan Kara 2572dfa2064bSJan Kara static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, 2573dfa2064bSJan Kara struct ext4_inode *raw_inode, 2574dfa2064bSJan Kara int isize_diff, size_t ifree, 2575dfa2064bSJan Kara size_t bfree, int *total_ino) 2576dfa2064bSJan Kara { 2577dfa2064bSJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 2578dfa2064bSJan Kara struct ext4_xattr_entry *small_entry; 2579dfa2064bSJan Kara struct ext4_xattr_entry *entry; 2580dfa2064bSJan Kara struct ext4_xattr_entry *last; 2581dfa2064bSJan Kara unsigned int entry_size; /* EA entry size */ 2582dfa2064bSJan Kara unsigned int total_size; /* EA entry size + value size */ 2583dfa2064bSJan Kara unsigned int min_total_size; 2584dfa2064bSJan Kara int error; 2585dfa2064bSJan Kara 2586dfa2064bSJan Kara while (isize_diff > ifree) { 2587dfa2064bSJan Kara entry = NULL; 2588dfa2064bSJan Kara small_entry = NULL; 2589dfa2064bSJan Kara min_total_size = ~0U; 2590dfa2064bSJan Kara last = IFIRST(header); 2591dfa2064bSJan Kara /* Find the entry best suited to be pushed into EA block */ 2592dfa2064bSJan Kara for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 25939bb21cedSTahsin Erdogan total_size = EXT4_XATTR_LEN(last->e_name_len); 25949bb21cedSTahsin Erdogan if (!last->e_value_inum) 25959bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 25969bb21cedSTahsin Erdogan le32_to_cpu(last->e_value_size)); 2597dfa2064bSJan Kara if (total_size <= bfree && 2598dfa2064bSJan Kara total_size < min_total_size) { 2599dfa2064bSJan Kara if (total_size + ifree < isize_diff) { 2600dfa2064bSJan Kara small_entry = last; 2601dfa2064bSJan Kara } else { 2602dfa2064bSJan Kara entry = last; 2603dfa2064bSJan Kara min_total_size = total_size; 2604dfa2064bSJan Kara } 2605dfa2064bSJan Kara } 2606dfa2064bSJan Kara } 2607dfa2064bSJan Kara 2608dfa2064bSJan Kara if (entry == NULL) { 2609dfa2064bSJan Kara if (small_entry == NULL) 2610dfa2064bSJan Kara return -ENOSPC; 2611dfa2064bSJan Kara entry = small_entry; 2612dfa2064bSJan Kara } 2613dfa2064bSJan Kara 2614dfa2064bSJan Kara entry_size = EXT4_XATTR_LEN(entry->e_name_len); 26159bb21cedSTahsin Erdogan total_size = entry_size; 26169bb21cedSTahsin Erdogan if (!entry->e_value_inum) 26179bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 26189bb21cedSTahsin Erdogan le32_to_cpu(entry->e_value_size)); 2619dfa2064bSJan Kara error = ext4_xattr_move_to_block(handle, inode, raw_inode, 2620dfa2064bSJan Kara entry); 2621dfa2064bSJan Kara if (error) 2622dfa2064bSJan Kara return error; 2623dfa2064bSJan Kara 2624dfa2064bSJan Kara *total_ino -= entry_size; 2625dfa2064bSJan Kara ifree += total_size; 2626dfa2064bSJan Kara bfree -= total_size; 2627dfa2064bSJan Kara } 2628dfa2064bSJan Kara 2629dfa2064bSJan Kara return 0; 2630dfa2064bSJan Kara } 2631dfa2064bSJan Kara 26323f2571c1SJan Kara /* 26336dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 26346dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 26356dd4ee7cSKalpak Shah */ 26366dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 26376dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 26386dd4ee7cSKalpak Shah { 26396dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 26406dd4ee7cSKalpak Shah struct buffer_head *bh = NULL; 2641*cf0a5e81SMiao Xie struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 2642*cf0a5e81SMiao Xie static unsigned int mnt_count; 2643e3014d14SJan Kara size_t min_offs; 2644e3014d14SJan Kara size_t ifree, bfree; 26457b1b2c1bSTheodore Ts'o int total_ino; 26466e0cd088SJan Kara void *base, *end; 2647d0141191SJan Kara int error = 0, tried_min_extra_isize = 0; 2648*cf0a5e81SMiao Xie int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); 2649d0141191SJan Kara int isize_diff; /* How much do we need to grow i_extra_isize */ 2650c755e251STheodore Ts'o 26516dd4ee7cSKalpak Shah retry: 2652d0141191SJan Kara isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; 26532e81a4eeSJan Kara if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) 26542e81a4eeSJan Kara goto out; 26556dd4ee7cSKalpak Shah 26566dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 26576dd4ee7cSKalpak Shah 26586dd4ee7cSKalpak Shah /* 26596dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 26606dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 26616dd4ee7cSKalpak Shah */ 26626dd4ee7cSKalpak Shah 26636e0cd088SJan Kara base = IFIRST(header); 26646dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 26656dd4ee7cSKalpak Shah min_offs = end - base; 26666dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 26676dd4ee7cSKalpak Shah 26689e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 26699e92f48cSTheodore Ts'o if (error) 26709e92f48cSTheodore Ts'o goto cleanup; 26719e92f48cSTheodore Ts'o 26726e0cd088SJan Kara ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); 2673e3014d14SJan Kara if (ifree >= isize_diff) 2674e3014d14SJan Kara goto shift; 26756dd4ee7cSKalpak Shah 26766dd4ee7cSKalpak Shah /* 26776dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 26786dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 26796dd4ee7cSKalpak Shah */ 26806dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 26816dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 26826dd4ee7cSKalpak Shah error = -EIO; 26836dd4ee7cSKalpak Shah if (!bh) 26846dd4ee7cSKalpak Shah goto cleanup; 2685cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 268624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 268724676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 26886a797d27SDarrick J. Wong error = -EFSCORRUPTED; 26896dd4ee7cSKalpak Shah goto cleanup; 26906dd4ee7cSKalpak Shah } 26916dd4ee7cSKalpak Shah base = BHDR(bh); 26926dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 26936dd4ee7cSKalpak Shah min_offs = end - base; 26946e0cd088SJan Kara bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, 26956e0cd088SJan Kara NULL); 2696e3014d14SJan Kara if (bfree + ifree < isize_diff) { 26976dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 26986dd4ee7cSKalpak Shah tried_min_extra_isize++; 26996dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 27006dd4ee7cSKalpak Shah brelse(bh); 27016dd4ee7cSKalpak Shah goto retry; 27026dd4ee7cSKalpak Shah } 2703dfa2064bSJan Kara error = -ENOSPC; 27046dd4ee7cSKalpak Shah goto cleanup; 27056dd4ee7cSKalpak Shah } 27066dd4ee7cSKalpak Shah } else { 2707e3014d14SJan Kara bfree = inode->i_sb->s_blocksize; 27086dd4ee7cSKalpak Shah } 27096dd4ee7cSKalpak Shah 2710dfa2064bSJan Kara error = ext4_xattr_make_inode_space(handle, inode, raw_inode, 2711dfa2064bSJan Kara isize_diff, ifree, bfree, 2712dfa2064bSJan Kara &total_ino); 2713dfa2064bSJan Kara if (error) { 2714dfa2064bSJan Kara if (error == -ENOSPC && !tried_min_extra_isize && 27156dd4ee7cSKalpak Shah s_min_extra_isize) { 27166dd4ee7cSKalpak Shah tried_min_extra_isize++; 27176dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 2718dcb9917bSTheodore Ts'o brelse(bh); 27196dd4ee7cSKalpak Shah goto retry; 27206dd4ee7cSKalpak Shah } 27216dd4ee7cSKalpak Shah goto cleanup; 27226dd4ee7cSKalpak Shah } 2723e3014d14SJan Kara shift: 2724e3014d14SJan Kara /* Adjust the offsets and shift the remaining entries ahead */ 27256e0cd088SJan Kara ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize 2726e3014d14SJan Kara - new_extra_isize, (void *)raw_inode + 2727e3014d14SJan Kara EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 272894405713SJan Kara (void *)header, total_ino); 2729e3014d14SJan Kara EXT4_I(inode)->i_extra_isize = new_extra_isize; 27306dd4ee7cSKalpak Shah brelse(bh); 27312e81a4eeSJan Kara out: 27326dd4ee7cSKalpak Shah return 0; 27336dd4ee7cSKalpak Shah 27346dd4ee7cSKalpak Shah cleanup: 27356dd4ee7cSKalpak Shah brelse(bh); 2736*cf0a5e81SMiao Xie if (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count)) { 2737*cf0a5e81SMiao Xie ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", 2738*cf0a5e81SMiao Xie inode->i_ino); 2739*cf0a5e81SMiao Xie mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); 2740*cf0a5e81SMiao Xie } 27416dd4ee7cSKalpak Shah return error; 27426dd4ee7cSKalpak Shah } 27436dd4ee7cSKalpak Shah 2744e50e5129SAndreas Dilger #define EIA_INCR 16 /* must be 2^n */ 2745e50e5129SAndreas Dilger #define EIA_MASK (EIA_INCR - 1) 2746dec214d0STahsin Erdogan 2747dec214d0STahsin Erdogan /* Add the large xattr @inode into @ea_inode_array for deferred iput(). 27480421a189STahsin Erdogan * If @ea_inode_array is new or full it will be grown and the old 2749e50e5129SAndreas Dilger * contents copied over. 2750e50e5129SAndreas Dilger */ 2751e50e5129SAndreas Dilger static int 27520421a189STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 27530421a189STahsin Erdogan struct inode *inode) 2754e50e5129SAndreas Dilger { 27550421a189STahsin Erdogan if (*ea_inode_array == NULL) { 2756e50e5129SAndreas Dilger /* 2757e50e5129SAndreas Dilger * Start with 15 inodes, so it fits into a power-of-two size. 27580421a189STahsin Erdogan * If *ea_inode_array is NULL, this is essentially offsetof() 2759e50e5129SAndreas Dilger */ 27600421a189STahsin Erdogan (*ea_inode_array) = 27610421a189STahsin Erdogan kmalloc(offsetof(struct ext4_xattr_inode_array, 27620421a189STahsin Erdogan inodes[EIA_MASK]), 2763e50e5129SAndreas Dilger GFP_NOFS); 27640421a189STahsin Erdogan if (*ea_inode_array == NULL) 2765e50e5129SAndreas Dilger return -ENOMEM; 27660421a189STahsin Erdogan (*ea_inode_array)->count = 0; 27670421a189STahsin Erdogan } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { 2768e50e5129SAndreas Dilger /* expand the array once all 15 + n * 16 slots are full */ 27690421a189STahsin Erdogan struct ext4_xattr_inode_array *new_array = NULL; 27700421a189STahsin Erdogan int count = (*ea_inode_array)->count; 2771e50e5129SAndreas Dilger 2772e50e5129SAndreas Dilger /* if new_array is NULL, this is essentially offsetof() */ 2773e50e5129SAndreas Dilger new_array = kmalloc( 27740421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, 27750421a189STahsin Erdogan inodes[count + EIA_INCR]), 2776e50e5129SAndreas Dilger GFP_NOFS); 2777e50e5129SAndreas Dilger if (new_array == NULL) 2778e50e5129SAndreas Dilger return -ENOMEM; 27790421a189STahsin Erdogan memcpy(new_array, *ea_inode_array, 27800421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, inodes[count])); 27810421a189STahsin Erdogan kfree(*ea_inode_array); 27820421a189STahsin Erdogan *ea_inode_array = new_array; 2783e50e5129SAndreas Dilger } 27840421a189STahsin Erdogan (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; 2785e50e5129SAndreas Dilger return 0; 2786e50e5129SAndreas Dilger } 2787e50e5129SAndreas Dilger 27886dd4ee7cSKalpak Shah /* 2789617ba13bSMingming Cao * ext4_xattr_delete_inode() 2790ac27a0ecSDave Kleikamp * 2791e50e5129SAndreas Dilger * Free extended attribute resources associated with this inode. Traverse 2792dec214d0STahsin Erdogan * all entries and decrement reference on any xattr inodes associated with this 2793dec214d0STahsin Erdogan * inode. This is called immediately before an inode is freed. We have exclusive 2794dec214d0STahsin Erdogan * access to the inode. If an orphan inode is deleted it will also release its 2795dec214d0STahsin Erdogan * references on xattr block and xattr inodes. 2796ac27a0ecSDave Kleikamp */ 2797dec214d0STahsin Erdogan int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, 279830a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 279930a7eb97STahsin Erdogan int extra_credits) 2800ac27a0ecSDave Kleikamp { 2801ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 2802e50e5129SAndreas Dilger struct ext4_xattr_ibody_header *header; 280330a7eb97STahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 2804dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 280530a7eb97STahsin Erdogan int error; 280630a7eb97STahsin Erdogan 280730a7eb97STahsin Erdogan error = ext4_xattr_ensure_credits(handle, inode, extra_credits, 280830a7eb97STahsin Erdogan NULL /* bh */, 280930a7eb97STahsin Erdogan false /* dirty */, 281030a7eb97STahsin Erdogan false /* block_csum */); 281130a7eb97STahsin Erdogan if (error) { 281230a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); 281330a7eb97STahsin Erdogan goto cleanup; 281430a7eb97STahsin Erdogan } 2815ac27a0ecSDave Kleikamp 2816dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2817dec214d0STahsin Erdogan ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 2818e50e5129SAndreas Dilger 2819e50e5129SAndreas Dilger error = ext4_get_inode_loc(inode, &iloc); 2820dec214d0STahsin Erdogan if (error) { 2821dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); 2822e50e5129SAndreas Dilger goto cleanup; 2823e50e5129SAndreas Dilger } 2824dec214d0STahsin Erdogan 2825dec214d0STahsin Erdogan error = ext4_journal_get_write_access(handle, iloc.bh); 2826dec214d0STahsin Erdogan if (error) { 2827dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "write access (error %d)", 2828dec214d0STahsin Erdogan error); 2829dec214d0STahsin Erdogan goto cleanup; 2830dec214d0STahsin Erdogan } 2831dec214d0STahsin Erdogan 2832dec214d0STahsin Erdogan header = IHDR(inode, ext4_raw_inode(&iloc)); 2833dec214d0STahsin Erdogan if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) 2834dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, 2835dec214d0STahsin Erdogan IFIRST(header), 2836dec214d0STahsin Erdogan false /* block_csum */, 2837dec214d0STahsin Erdogan ea_inode_array, 2838dec214d0STahsin Erdogan extra_credits, 2839dec214d0STahsin Erdogan false /* skip_quota */); 2840dec214d0STahsin Erdogan } 2841dec214d0STahsin Erdogan 2842dec214d0STahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 2843617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 2844ac27a0ecSDave Kleikamp if (!bh) { 284524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 284624676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 284765d30005STahsin Erdogan error = -EIO; 2848ac27a0ecSDave Kleikamp goto cleanup; 2849ac27a0ecSDave Kleikamp } 2850dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2851dec214d0STahsin Erdogan if (error) { 2852dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "bad block %llu (error %d)", 2853dec214d0STahsin Erdogan EXT4_I(inode)->i_file_acl, error); 2854ac27a0ecSDave Kleikamp goto cleanup; 2855ac27a0ecSDave Kleikamp } 2856e50e5129SAndreas Dilger 285730a7eb97STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) { 2858dec214d0STahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 2859dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 2860dec214d0STahsin Erdogan if (entry->e_value_inum) 2861dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 2862dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 2863dec214d0STahsin Erdogan 2864e50e5129SAndreas Dilger } 2865e50e5129SAndreas Dilger 2866dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bh, ea_inode_array, 2867dec214d0STahsin Erdogan extra_credits); 2868dec214d0STahsin Erdogan /* 2869dec214d0STahsin Erdogan * Update i_file_acl value in the same transaction that releases 2870dec214d0STahsin Erdogan * block. 2871dec214d0STahsin Erdogan */ 2872617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 287330a7eb97STahsin Erdogan error = ext4_mark_inode_dirty(handle, inode); 287430a7eb97STahsin Erdogan if (error) { 287530a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", 287630a7eb97STahsin Erdogan error); 287730a7eb97STahsin Erdogan goto cleanup; 287830a7eb97STahsin Erdogan } 2879dec214d0STahsin Erdogan } 2880dec214d0STahsin Erdogan error = 0; 2881ac27a0ecSDave Kleikamp cleanup: 288230a7eb97STahsin Erdogan brelse(iloc.bh); 2883ac27a0ecSDave Kleikamp brelse(bh); 2884e50e5129SAndreas Dilger return error; 2885e50e5129SAndreas Dilger } 2886e50e5129SAndreas Dilger 28870421a189STahsin Erdogan void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) 2888e50e5129SAndreas Dilger { 2889dec214d0STahsin Erdogan int idx; 2890e50e5129SAndreas Dilger 28910421a189STahsin Erdogan if (ea_inode_array == NULL) 2892e50e5129SAndreas Dilger return; 2893e50e5129SAndreas Dilger 2894dec214d0STahsin Erdogan for (idx = 0; idx < ea_inode_array->count; ++idx) 2895dec214d0STahsin Erdogan iput(ea_inode_array->inodes[idx]); 28960421a189STahsin Erdogan kfree(ea_inode_array); 2897ac27a0ecSDave Kleikamp } 2898ac27a0ecSDave Kleikamp 2899ac27a0ecSDave Kleikamp /* 290047387409STahsin Erdogan * ext4_xattr_block_cache_insert() 2901ac27a0ecSDave Kleikamp * 290247387409STahsin Erdogan * Create a new entry in the extended attribute block cache, and insert 2903ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 2904ac27a0ecSDave Kleikamp * 2905ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2906ac27a0ecSDave Kleikamp */ 2907ac27a0ecSDave Kleikamp static void 290847387409STahsin Erdogan ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, 290947387409STahsin Erdogan struct buffer_head *bh) 2910ac27a0ecSDave Kleikamp { 29116048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 29126048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 29136048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 29146048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 2915ac27a0ecSDave Kleikamp int error; 2916ac27a0ecSDave Kleikamp 2917cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 2918cdb7ee4cSTahsin Erdogan return; 291947387409STahsin Erdogan error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, 29206048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 2921ac27a0ecSDave Kleikamp if (error) { 292282939d79SJan Kara if (error == -EBUSY) 2923ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 292482939d79SJan Kara } else 2925ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 2926ac27a0ecSDave Kleikamp } 2927ac27a0ecSDave Kleikamp 2928ac27a0ecSDave Kleikamp /* 2929617ba13bSMingming Cao * ext4_xattr_cmp() 2930ac27a0ecSDave Kleikamp * 2931ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 2932ac27a0ecSDave Kleikamp * 2933ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 2934ac27a0ecSDave Kleikamp * a negative error number on errors. 2935ac27a0ecSDave Kleikamp */ 2936ac27a0ecSDave Kleikamp static int 2937617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 2938617ba13bSMingming Cao struct ext4_xattr_header *header2) 2939ac27a0ecSDave Kleikamp { 2940617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 2941ac27a0ecSDave Kleikamp 2942ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 2943ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 2944ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 2945ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 2946ac27a0ecSDave Kleikamp return 1; 2947ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 2948ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 2949ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 2950ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 2951e50e5129SAndreas Dilger entry1->e_value_inum != entry2->e_value_inum || 2952ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 2953ac27a0ecSDave Kleikamp return 1; 29547cec1918STahsin Erdogan if (!entry1->e_value_inum && 29557cec1918STahsin Erdogan memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 2956ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 2957ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 2958ac27a0ecSDave Kleikamp return 1; 2959ac27a0ecSDave Kleikamp 2960617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 2961617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 2962ac27a0ecSDave Kleikamp } 2963ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 2964ac27a0ecSDave Kleikamp return 1; 2965ac27a0ecSDave Kleikamp return 0; 2966ac27a0ecSDave Kleikamp } 2967ac27a0ecSDave Kleikamp 2968ac27a0ecSDave Kleikamp /* 296947387409STahsin Erdogan * ext4_xattr_block_cache_find() 2970ac27a0ecSDave Kleikamp * 2971ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 2972ac27a0ecSDave Kleikamp * 2973ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 2974ac27a0ecSDave Kleikamp * not found or an error occurred. 2975ac27a0ecSDave Kleikamp */ 2976ac27a0ecSDave Kleikamp static struct buffer_head * 297747387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *inode, 297847387409STahsin Erdogan struct ext4_xattr_header *header, 29797a2508e1SJan Kara struct mb_cache_entry **pce) 2980ac27a0ecSDave Kleikamp { 2981ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 29827a2508e1SJan Kara struct mb_cache_entry *ce; 298347387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 2984ac27a0ecSDave Kleikamp 2985cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 2986cdb7ee4cSTahsin Erdogan return NULL; 2987ac27a0ecSDave Kleikamp if (!header->h_hash) 2988ac27a0ecSDave Kleikamp return NULL; /* never share */ 2989ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 299047387409STahsin Erdogan ce = mb_cache_entry_find_first(ea_block_cache, hash); 2991ac27a0ecSDave Kleikamp while (ce) { 2992ac27a0ecSDave Kleikamp struct buffer_head *bh; 2993ac27a0ecSDave Kleikamp 2994c07dfcb4STahsin Erdogan bh = sb_bread(inode->i_sb, ce->e_value); 2995ac27a0ecSDave Kleikamp if (!bh) { 299624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 2997c07dfcb4STahsin Erdogan (unsigned long)ce->e_value); 2998617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 2999ac27a0ecSDave Kleikamp *pce = ce; 3000ac27a0ecSDave Kleikamp return bh; 3001ac27a0ecSDave Kleikamp } 3002ac27a0ecSDave Kleikamp brelse(bh); 300347387409STahsin Erdogan ce = mb_cache_entry_find_next(ea_block_cache, ce); 3004ac27a0ecSDave Kleikamp } 3005ac27a0ecSDave Kleikamp return NULL; 3006ac27a0ecSDave Kleikamp } 3007ac27a0ecSDave Kleikamp 3008ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 3009ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 3010ac27a0ecSDave Kleikamp 3011ac27a0ecSDave Kleikamp /* 3012617ba13bSMingming Cao * ext4_xattr_hash_entry() 3013ac27a0ecSDave Kleikamp * 3014ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 3015ac27a0ecSDave Kleikamp */ 3016b9fc761eSTahsin Erdogan static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, 3017b9fc761eSTahsin Erdogan size_t value_count) 3018ac27a0ecSDave Kleikamp { 3019ac27a0ecSDave Kleikamp __u32 hash = 0; 3020ac27a0ecSDave Kleikamp 3021b9fc761eSTahsin Erdogan while (name_len--) { 3022ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 3023ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 3024ac27a0ecSDave Kleikamp *name++; 3025ac27a0ecSDave Kleikamp } 3026b9fc761eSTahsin Erdogan while (value_count--) { 3027ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 3028ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 3029ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 3030ac27a0ecSDave Kleikamp } 3031b9fc761eSTahsin Erdogan return cpu_to_le32(hash); 3032ac27a0ecSDave Kleikamp } 3033ac27a0ecSDave Kleikamp 3034ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 3035ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 3036ac27a0ecSDave Kleikamp 3037ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 3038ac27a0ecSDave Kleikamp 3039ac27a0ecSDave Kleikamp /* 3040617ba13bSMingming Cao * ext4_xattr_rehash() 3041ac27a0ecSDave Kleikamp * 3042ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 3043ac27a0ecSDave Kleikamp */ 3044daf83281STahsin Erdogan static void ext4_xattr_rehash(struct ext4_xattr_header *header) 3045ac27a0ecSDave Kleikamp { 3046617ba13bSMingming Cao struct ext4_xattr_entry *here; 3047ac27a0ecSDave Kleikamp __u32 hash = 0; 3048ac27a0ecSDave Kleikamp 3049ac27a0ecSDave Kleikamp here = ENTRY(header+1); 3050ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 3051ac27a0ecSDave Kleikamp if (!here->e_hash) { 3052ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 3053ac27a0ecSDave Kleikamp hash = 0; 3054ac27a0ecSDave Kleikamp break; 3055ac27a0ecSDave Kleikamp } 3056ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 3057ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 3058ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 3059617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 3060ac27a0ecSDave Kleikamp } 3061ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 3062ac27a0ecSDave Kleikamp } 3063ac27a0ecSDave Kleikamp 3064ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 3065ac27a0ecSDave Kleikamp 30669c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 30679c191f70ST Makphaibulchoke 30687a2508e1SJan Kara struct mb_cache * 306982939d79SJan Kara ext4_xattr_create_cache(void) 3070ac27a0ecSDave Kleikamp { 30717a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 3072ac27a0ecSDave Kleikamp } 3073ac27a0ecSDave Kleikamp 30747a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 3075ac27a0ecSDave Kleikamp { 30769c191f70ST Makphaibulchoke if (cache) 30777a2508e1SJan Kara mb_cache_destroy(cache); 3078ac27a0ecSDave Kleikamp } 30799c191f70ST Makphaibulchoke 3080