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 } 1546*32aaf194STahsin Erdogan goto update_hash; 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 1710*32aaf194STahsin Erdogan update_hash: 1711b9fc761eSTahsin Erdogan if (i->value) { 1712b9fc761eSTahsin Erdogan __le32 hash = 0; 1713b9fc761eSTahsin Erdogan 1714b9fc761eSTahsin Erdogan /* Entry hash calculation. */ 1715b9fc761eSTahsin Erdogan if (in_inode) { 1716b9fc761eSTahsin Erdogan __le32 crc32c_hash; 1717b9fc761eSTahsin Erdogan 1718b9fc761eSTahsin Erdogan /* 1719b9fc761eSTahsin Erdogan * Feed crc32c hash instead of the raw value for entry 1720b9fc761eSTahsin Erdogan * hash calculation. This is to avoid walking 1721b9fc761eSTahsin Erdogan * potentially long value buffer again. 1722b9fc761eSTahsin Erdogan */ 1723b9fc761eSTahsin Erdogan crc32c_hash = cpu_to_le32( 1724b9fc761eSTahsin Erdogan ext4_xattr_inode_get_hash(new_ea_inode)); 1725b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1726b9fc761eSTahsin Erdogan here->e_name_len, 1727b9fc761eSTahsin Erdogan &crc32c_hash, 1); 1728b9fc761eSTahsin Erdogan } else if (is_block) { 1729*32aaf194STahsin Erdogan __le32 *value = s->base + le16_to_cpu( 1730*32aaf194STahsin Erdogan here->e_value_offs); 1731b9fc761eSTahsin Erdogan 1732b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1733b9fc761eSTahsin Erdogan here->e_name_len, value, 1734b9fc761eSTahsin Erdogan new_size >> 2); 1735daf83281STahsin Erdogan } 1736b9fc761eSTahsin Erdogan here->e_hash = hash; 1737b9fc761eSTahsin Erdogan } 1738b9fc761eSTahsin Erdogan 1739b9fc761eSTahsin Erdogan if (is_block) 1740b9fc761eSTahsin Erdogan ext4_xattr_rehash((struct ext4_xattr_header *)s->base); 1741daf83281STahsin Erdogan 1742dec214d0STahsin Erdogan ret = 0; 1743e50e5129SAndreas Dilger out: 1744dec214d0STahsin Erdogan iput(old_ea_inode); 1745dec214d0STahsin Erdogan iput(new_ea_inode); 1746dec214d0STahsin Erdogan return ret; 1747ac27a0ecSDave Kleikamp } 1748ac27a0ecSDave Kleikamp 1749617ba13bSMingming Cao struct ext4_xattr_block_find { 1750617ba13bSMingming Cao struct ext4_xattr_search s; 1751ac27a0ecSDave Kleikamp struct buffer_head *bh; 1752ac27a0ecSDave Kleikamp }; 1753ac27a0ecSDave Kleikamp 1754ac27a0ecSDave Kleikamp static int 1755617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 1756617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1757ac27a0ecSDave Kleikamp { 1758ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1759ac27a0ecSDave Kleikamp int error; 1760ac27a0ecSDave Kleikamp 1761ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 1762ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 1763ac27a0ecSDave Kleikamp 1764617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 1765ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 1766617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 1767ac27a0ecSDave Kleikamp error = -EIO; 1768ac27a0ecSDave Kleikamp if (!bs->bh) 1769ac27a0ecSDave Kleikamp goto cleanup; 1770ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 1771ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 1772ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 1773cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bs->bh)) { 177424676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 177524676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 17766a797d27SDarrick J. Wong error = -EFSCORRUPTED; 1777ac27a0ecSDave Kleikamp goto cleanup; 1778ac27a0ecSDave Kleikamp } 1779ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1780ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 1781ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 1782ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 1783ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 1784617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 17856ba644b9SEric Biggers i->name, 1); 1786ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1787ac27a0ecSDave Kleikamp goto cleanup; 1788ac27a0ecSDave Kleikamp bs->s.not_found = error; 1789ac27a0ecSDave Kleikamp } 1790ac27a0ecSDave Kleikamp error = 0; 1791ac27a0ecSDave Kleikamp 1792ac27a0ecSDave Kleikamp cleanup: 1793ac27a0ecSDave Kleikamp return error; 1794ac27a0ecSDave Kleikamp } 1795ac27a0ecSDave Kleikamp 1796ac27a0ecSDave Kleikamp static int 1797617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 1798617ba13bSMingming Cao struct ext4_xattr_info *i, 1799617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1800ac27a0ecSDave Kleikamp { 1801ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1802ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 1803b347e2bcSTahsin Erdogan struct ext4_xattr_search s_copy = bs->s; 1804b347e2bcSTahsin Erdogan struct ext4_xattr_search *s = &s_copy; 18057a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 18068a2bfdcbSMingming Cao int error = 0; 180747387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 1808dec214d0STahsin Erdogan struct inode *ea_inode = NULL; 1809dec214d0STahsin Erdogan size_t old_ea_inode_size = 0; 1810ac27a0ecSDave Kleikamp 1811617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 1812ac27a0ecSDave Kleikamp 1813ac27a0ecSDave Kleikamp if (s->base) { 18145d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 18158a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 18168a2bfdcbSMingming Cao if (error) 18178a2bfdcbSMingming Cao goto cleanup; 18188a2bfdcbSMingming Cao lock_buffer(bs->bh); 18198a2bfdcbSMingming Cao 1820ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 182182939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 182282939d79SJan Kara 182382939d79SJan Kara /* 182482939d79SJan Kara * This must happen under buffer lock for 182582939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 182682939d79SJan Kara * block 182782939d79SJan Kara */ 1828cdb7ee4cSTahsin Erdogan if (ea_block_cache) 182947387409STahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, 183082939d79SJan Kara bs->bh->b_blocknr); 1831ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 1832daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 1833daf83281STahsin Erdogan true /* is_block */); 1834dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bs->bh); 1835ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 18366a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1837ac27a0ecSDave Kleikamp goto bad_block; 1838ac27a0ecSDave Kleikamp if (!error) 1839dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 18400390131bSFrank Mayhar inode, 1841ac27a0ecSDave Kleikamp bs->bh); 1842ac27a0ecSDave Kleikamp if (error) 1843ac27a0ecSDave Kleikamp goto cleanup; 1844ac27a0ecSDave Kleikamp goto inserted; 1845ac27a0ecSDave Kleikamp } else { 1846ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 1847ac27a0ecSDave Kleikamp 18488a2bfdcbSMingming Cao unlock_buffer(bs->bh); 1849ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 1850216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 1851ac27a0ecSDave Kleikamp error = -ENOMEM; 1852ac27a0ecSDave Kleikamp if (s->base == NULL) 1853ac27a0ecSDave Kleikamp goto cleanup; 1854ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 1855ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1856ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1857ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 1858ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 1859dec214d0STahsin Erdogan 1860dec214d0STahsin Erdogan /* 1861dec214d0STahsin Erdogan * If existing entry points to an xattr inode, we need 1862dec214d0STahsin Erdogan * to prevent ext4_xattr_set_entry() from decrementing 1863dec214d0STahsin Erdogan * ref count on it because the reference belongs to the 1864dec214d0STahsin Erdogan * original block. In this case, make the entry look 1865dec214d0STahsin Erdogan * like it has an empty value. 1866dec214d0STahsin Erdogan */ 1867dec214d0STahsin Erdogan if (!s->not_found && s->here->e_value_inum) { 1868dec214d0STahsin Erdogan /* 1869dec214d0STahsin Erdogan * Defer quota free call for previous inode 1870dec214d0STahsin Erdogan * until success is guaranteed. 1871dec214d0STahsin Erdogan */ 1872dec214d0STahsin Erdogan old_ea_inode_size = le32_to_cpu( 1873dec214d0STahsin Erdogan s->here->e_value_size); 1874dec214d0STahsin Erdogan s->here->e_value_inum = 0; 1875dec214d0STahsin Erdogan s->here->e_value_size = 0; 1876dec214d0STahsin Erdogan } 1877ac27a0ecSDave Kleikamp } 1878ac27a0ecSDave Kleikamp } else { 1879ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 1880216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 1881ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 1882ac27a0ecSDave Kleikamp error = -ENOMEM; 1883ac27a0ecSDave Kleikamp if (s->base == NULL) 1884ac27a0ecSDave Kleikamp goto cleanup; 1885617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 1886ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 1887ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1888ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1889ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 1890ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 1891ac27a0ecSDave Kleikamp } 1892ac27a0ecSDave Kleikamp 1893daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); 18946a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1895ac27a0ecSDave Kleikamp goto bad_block; 1896ac27a0ecSDave Kleikamp if (error) 1897ac27a0ecSDave Kleikamp goto cleanup; 1898dec214d0STahsin Erdogan 1899dec214d0STahsin Erdogan if (i->value && s->here->e_value_inum) { 1900dec214d0STahsin Erdogan unsigned int ea_ino; 1901dec214d0STahsin Erdogan 1902dec214d0STahsin Erdogan /* 1903dec214d0STahsin Erdogan * A ref count on ea_inode has been taken as part of the call to 1904dec214d0STahsin Erdogan * ext4_xattr_set_entry() above. We would like to drop this 1905dec214d0STahsin Erdogan * extra ref but we have to wait until the xattr block is 1906dec214d0STahsin Erdogan * initialized and has its own ref count on the ea_inode. 1907dec214d0STahsin Erdogan */ 1908dec214d0STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 1909dec214d0STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, &ea_inode); 1910dec214d0STahsin Erdogan if (error) { 1911dec214d0STahsin Erdogan ea_inode = NULL; 1912dec214d0STahsin Erdogan goto cleanup; 1913dec214d0STahsin Erdogan } 1914dec214d0STahsin Erdogan } 1915dec214d0STahsin Erdogan 1916ac27a0ecSDave Kleikamp inserted: 1917ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 191847387409STahsin Erdogan new_bh = ext4_xattr_block_cache_find(inode, header(s->base), 191947387409STahsin Erdogan &ce); 1920ac27a0ecSDave Kleikamp if (new_bh) { 1921ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 1922ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 1923ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 1924ac27a0ecSDave Kleikamp else { 19256048c64bSAndreas Gruenbacher u32 ref; 19266048c64bSAndreas Gruenbacher 1927b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 1928b8cb5a54STahsin Erdogan 1929ac27a0ecSDave Kleikamp /* The old block is released after updating 1930ac27a0ecSDave Kleikamp the inode. */ 19311231b3a1SLukas Czerner error = dquot_alloc_block(inode, 19321231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 19335dd4056dSChristoph Hellwig if (error) 1934ac27a0ecSDave Kleikamp goto cleanup; 19355d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 1936617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 1937ac27a0ecSDave Kleikamp new_bh); 1938ac27a0ecSDave Kleikamp if (error) 1939ac27a0ecSDave Kleikamp goto cleanup_dquot; 1940ac27a0ecSDave Kleikamp lock_buffer(new_bh); 194182939d79SJan Kara /* 194282939d79SJan Kara * We have to be careful about races with 19436048c64bSAndreas Gruenbacher * freeing, rehashing or adding references to 19446048c64bSAndreas Gruenbacher * xattr block. Once we hold buffer lock xattr 19456048c64bSAndreas Gruenbacher * block's state is stable so we can check 19466048c64bSAndreas Gruenbacher * whether the block got freed / rehashed or 19476048c64bSAndreas Gruenbacher * not. Since we unhash mbcache entry under 19486048c64bSAndreas Gruenbacher * buffer lock when freeing / rehashing xattr 19496048c64bSAndreas Gruenbacher * block, checking whether entry is still 19506048c64bSAndreas Gruenbacher * hashed is reliable. Same rules hold for 19516048c64bSAndreas Gruenbacher * e_reusable handling. 195282939d79SJan Kara */ 19536048c64bSAndreas Gruenbacher if (hlist_bl_unhashed(&ce->e_hash_list) || 19546048c64bSAndreas Gruenbacher !ce->e_reusable) { 195582939d79SJan Kara /* 195682939d79SJan Kara * Undo everything and check mbcache 195782939d79SJan Kara * again. 195882939d79SJan Kara */ 195982939d79SJan Kara unlock_buffer(new_bh); 196082939d79SJan Kara dquot_free_block(inode, 196182939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 196282939d79SJan Kara 1)); 196382939d79SJan Kara brelse(new_bh); 196447387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 196582939d79SJan Kara ce = NULL; 196682939d79SJan Kara new_bh = NULL; 196782939d79SJan Kara goto inserted; 196882939d79SJan Kara } 19696048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 19706048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 19716048c64bSAndreas Gruenbacher if (ref >= EXT4_XATTR_REFCOUNT_MAX) 19726048c64bSAndreas Gruenbacher ce->e_reusable = 0; 1973ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 19746048c64bSAndreas Gruenbacher ref); 1975dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 1976ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 1977dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 19780390131bSFrank Mayhar inode, 1979ac27a0ecSDave Kleikamp new_bh); 1980ac27a0ecSDave Kleikamp if (error) 1981ac27a0ecSDave Kleikamp goto cleanup_dquot; 1982ac27a0ecSDave Kleikamp } 198347387409STahsin Erdogan mb_cache_entry_touch(ea_block_cache, ce); 198447387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 1985ac27a0ecSDave Kleikamp ce = NULL; 1986ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 1987ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 1988ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 1989ec000220STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); 1990ac27a0ecSDave Kleikamp new_bh = bs->bh; 1991ac27a0ecSDave Kleikamp get_bh(new_bh); 1992ac27a0ecSDave Kleikamp } else { 1993ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 1994fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 1995fb0a387dSEric Sandeen 1996b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 1997b8cb5a54STahsin Erdogan 1998fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 1999d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 2000fb0a387dSEric Sandeen 2001fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 200212e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 2003fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 2004fb0a387dSEric Sandeen 200555f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 200655f020dbSAllison Henderson NULL, &error); 2007ac27a0ecSDave Kleikamp if (error) 2008ac27a0ecSDave Kleikamp goto cleanup; 2009fb0a387dSEric Sandeen 201012e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 2011fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 2012fb0a387dSEric Sandeen 2013ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 2014ace36ad4SJoe Perches (unsigned long long)block); 2015ac27a0ecSDave Kleikamp 2016ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 2017aebf0243SWang Shilong if (unlikely(!new_bh)) { 2018860d21e2STheodore Ts'o error = -ENOMEM; 2019ac27a0ecSDave Kleikamp getblk_failed: 20207dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 2021e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 2022ac27a0ecSDave Kleikamp goto cleanup; 2023ac27a0ecSDave Kleikamp } 2024dec214d0STahsin Erdogan error = ext4_xattr_inode_inc_ref_all(handle, inode, 2025dec214d0STahsin Erdogan ENTRY(header(s->base)+1)); 2026dec214d0STahsin Erdogan if (error) 2027dec214d0STahsin Erdogan goto getblk_failed; 2028dec214d0STahsin Erdogan if (ea_inode) { 2029dec214d0STahsin Erdogan /* Drop the extra ref on ea_inode. */ 2030dec214d0STahsin Erdogan error = ext4_xattr_inode_dec_ref(handle, 2031dec214d0STahsin Erdogan ea_inode); 2032dec214d0STahsin Erdogan if (error) 2033dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 2034dec214d0STahsin Erdogan "dec ref error=%d", 2035dec214d0STahsin Erdogan error); 2036dec214d0STahsin Erdogan iput(ea_inode); 2037dec214d0STahsin Erdogan ea_inode = NULL; 2038dec214d0STahsin Erdogan } 2039dec214d0STahsin Erdogan 2040ac27a0ecSDave Kleikamp lock_buffer(new_bh); 2041617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 2042ac27a0ecSDave Kleikamp if (error) { 2043ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2044860d21e2STheodore Ts'o error = -EIO; 2045ac27a0ecSDave Kleikamp goto getblk_failed; 2046ac27a0ecSDave Kleikamp } 2047ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 2048dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2049ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 2050ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 205147387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, new_bh); 2052dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, 2053dac7a4b4STheodore Ts'o new_bh); 2054ac27a0ecSDave Kleikamp if (error) 2055ac27a0ecSDave Kleikamp goto cleanup; 2056ac27a0ecSDave Kleikamp } 2057ac27a0ecSDave Kleikamp } 2058ac27a0ecSDave Kleikamp 2059dec214d0STahsin Erdogan if (old_ea_inode_size) 2060dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, old_ea_inode_size); 2061dec214d0STahsin Erdogan 2062ac27a0ecSDave Kleikamp /* Update the inode. */ 2063617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 2064ac27a0ecSDave Kleikamp 2065ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 2066dec214d0STahsin Erdogan if (bs->bh && bs->bh != new_bh) { 2067dec214d0STahsin Erdogan struct ext4_xattr_inode_array *ea_inode_array = NULL; 2068dec214d0STahsin Erdogan 2069dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bs->bh, 2070dec214d0STahsin Erdogan &ea_inode_array, 2071dec214d0STahsin Erdogan 0 /* extra_credits */); 2072dec214d0STahsin Erdogan ext4_xattr_inode_array_free(ea_inode_array); 2073dec214d0STahsin Erdogan } 2074ac27a0ecSDave Kleikamp error = 0; 2075ac27a0ecSDave Kleikamp 2076ac27a0ecSDave Kleikamp cleanup: 2077dec214d0STahsin Erdogan if (ea_inode) { 2078dec214d0STahsin Erdogan int error2; 2079dec214d0STahsin Erdogan 2080dec214d0STahsin Erdogan error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); 2081dec214d0STahsin Erdogan if (error2) 2082dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "dec ref error=%d", 2083dec214d0STahsin Erdogan error2); 2084dec214d0STahsin Erdogan 2085dec214d0STahsin Erdogan /* If there was an error, revert the quota charge. */ 2086dec214d0STahsin Erdogan if (error) 2087dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 2088dec214d0STahsin Erdogan i_size_read(ea_inode)); 2089dec214d0STahsin Erdogan iput(ea_inode); 2090dec214d0STahsin Erdogan } 2091ac27a0ecSDave Kleikamp if (ce) 209247387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2093ac27a0ecSDave Kleikamp brelse(new_bh); 2094ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 2095ac27a0ecSDave Kleikamp kfree(s->base); 2096ac27a0ecSDave Kleikamp 2097ac27a0ecSDave Kleikamp return error; 2098ac27a0ecSDave Kleikamp 2099ac27a0ecSDave Kleikamp cleanup_dquot: 21001231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 2101ac27a0ecSDave Kleikamp goto cleanup; 2102ac27a0ecSDave Kleikamp 2103ac27a0ecSDave Kleikamp bad_block: 210424676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 210524676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2106ac27a0ecSDave Kleikamp goto cleanup; 2107ac27a0ecSDave Kleikamp 2108ac27a0ecSDave Kleikamp #undef header 2109ac27a0ecSDave Kleikamp } 2110ac27a0ecSDave Kleikamp 2111879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 2112617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2113ac27a0ecSDave Kleikamp { 2114617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2115617ba13bSMingming Cao struct ext4_inode *raw_inode; 2116ac27a0ecSDave Kleikamp int error; 2117ac27a0ecSDave Kleikamp 2118617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 2119ac27a0ecSDave Kleikamp return 0; 2120617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 2121ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 2122ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 2123ac27a0ecSDave Kleikamp is->s.here = is->s.first; 2124617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 212519f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 21269e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 2127ac27a0ecSDave Kleikamp if (error) 2128ac27a0ecSDave Kleikamp return error; 2129ac27a0ecSDave Kleikamp /* Find the named attribute. */ 2130617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 21316ba644b9SEric Biggers i->name, 0); 2132ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 2133ac27a0ecSDave Kleikamp return error; 2134ac27a0ecSDave Kleikamp is->s.not_found = error; 2135ac27a0ecSDave Kleikamp } 2136ac27a0ecSDave Kleikamp return 0; 2137ac27a0ecSDave Kleikamp } 2138ac27a0ecSDave Kleikamp 21390d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 21400d812f77STao Ma struct ext4_xattr_info *i, 21410d812f77STao Ma struct ext4_xattr_ibody_find *is) 21420d812f77STao Ma { 21430d812f77STao Ma struct ext4_xattr_ibody_header *header; 21440d812f77STao Ma struct ext4_xattr_search *s = &is->s; 21450d812f77STao Ma int error; 21460d812f77STao Ma 21470d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 21480d812f77STao Ma return -ENOSPC; 2149daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 21500d812f77STao Ma if (error) { 21510d812f77STao Ma if (error == -ENOSPC && 21520d812f77STao Ma ext4_has_inline_data(inode)) { 21530d812f77STao Ma error = ext4_try_to_evict_inline_data(handle, inode, 21540d812f77STao Ma EXT4_XATTR_LEN(strlen(i->name) + 21550d812f77STao Ma EXT4_XATTR_SIZE(i->value_len))); 21560d812f77STao Ma if (error) 21570d812f77STao Ma return error; 21580d812f77STao Ma error = ext4_xattr_ibody_find(inode, i, is); 21590d812f77STao Ma if (error) 21600d812f77STao Ma return error; 2161daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 2162daf83281STahsin Erdogan false /* is_block */); 21630d812f77STao Ma } 21640d812f77STao Ma if (error) 21650d812f77STao Ma return error; 21660d812f77STao Ma } 21670d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 21680d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 21690d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 21700d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 21710d812f77STao Ma } else { 21720d812f77STao Ma header->h_magic = cpu_to_le32(0); 21730d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 21740d812f77STao Ma } 21750d812f77STao Ma return 0; 21760d812f77STao Ma } 21770d812f77STao Ma 2178e50e5129SAndreas Dilger static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 2179617ba13bSMingming Cao struct ext4_xattr_info *i, 2180617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2181ac27a0ecSDave Kleikamp { 2182617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2183617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 2184ac27a0ecSDave Kleikamp int error; 2185ac27a0ecSDave Kleikamp 2186617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 2187ac27a0ecSDave Kleikamp return -ENOSPC; 2188daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 2189ac27a0ecSDave Kleikamp if (error) 2190ac27a0ecSDave Kleikamp return error; 2191617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 2192ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 2193617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 219419f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 2195ac27a0ecSDave Kleikamp } else { 2196ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 219719f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 2198ac27a0ecSDave Kleikamp } 2199ac27a0ecSDave Kleikamp return 0; 2200ac27a0ecSDave Kleikamp } 2201ac27a0ecSDave Kleikamp 22023fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 22033fd16462SJan Kara struct ext4_xattr_info *i) 22043fd16462SJan Kara { 22053fd16462SJan Kara void *value; 22063fd16462SJan Kara 22070bd454c0STahsin Erdogan /* When e_value_inum is set the value is stored externally. */ 22080bd454c0STahsin Erdogan if (s->here->e_value_inum) 22090bd454c0STahsin Erdogan return 0; 22103fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 22113fd16462SJan Kara return 0; 22123fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 22133fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 22143fd16462SJan Kara } 22153fd16462SJan Kara 2216dec214d0STahsin Erdogan static struct buffer_head *ext4_xattr_get_block(struct inode *inode) 2217dec214d0STahsin Erdogan { 2218dec214d0STahsin Erdogan struct buffer_head *bh; 2219dec214d0STahsin Erdogan int error; 2220dec214d0STahsin Erdogan 2221dec214d0STahsin Erdogan if (!EXT4_I(inode)->i_file_acl) 2222dec214d0STahsin Erdogan return NULL; 2223dec214d0STahsin Erdogan bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 2224dec214d0STahsin Erdogan if (!bh) 2225dec214d0STahsin Erdogan return ERR_PTR(-EIO); 2226dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2227dec214d0STahsin Erdogan if (error) 2228dec214d0STahsin Erdogan return ERR_PTR(error); 2229dec214d0STahsin Erdogan return bh; 2230dec214d0STahsin Erdogan } 2231dec214d0STahsin Erdogan 2232ac27a0ecSDave Kleikamp /* 2233617ba13bSMingming Cao * ext4_xattr_set_handle() 2234ac27a0ecSDave Kleikamp * 22356e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 2236ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 2237ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 2238ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 2239ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 2240ac27a0ecSDave Kleikamp * previous to the call, respectively. 2241ac27a0ecSDave Kleikamp * 2242ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2243ac27a0ecSDave Kleikamp */ 2244ac27a0ecSDave Kleikamp int 2245617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 2246ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 2247ac27a0ecSDave Kleikamp int flags) 2248ac27a0ecSDave Kleikamp { 2249617ba13bSMingming Cao struct ext4_xattr_info i = { 2250ac27a0ecSDave Kleikamp .name_index = name_index, 2251ac27a0ecSDave Kleikamp .name = name, 2252ac27a0ecSDave Kleikamp .value = value, 2253ac27a0ecSDave Kleikamp .value_len = value_len, 2254e50e5129SAndreas Dilger .in_inode = 0, 2255ac27a0ecSDave Kleikamp }; 2256617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 2257ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2258ac27a0ecSDave Kleikamp }; 2259617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 2260ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2261ac27a0ecSDave Kleikamp }; 2262c755e251STheodore Ts'o int no_expand; 2263ac27a0ecSDave Kleikamp int error; 2264ac27a0ecSDave Kleikamp 2265ac27a0ecSDave Kleikamp if (!name) 2266ac27a0ecSDave Kleikamp return -EINVAL; 2267ac27a0ecSDave Kleikamp if (strlen(name) > 255) 2268ac27a0ecSDave Kleikamp return -ERANGE; 2269b8cb5a54STahsin Erdogan 2270c755e251STheodore Ts'o ext4_write_lock_xattr(inode, &no_expand); 22714d20c685SKalpak Shah 2272c1a5d5f6STahsin Erdogan /* Check journal credits under write lock. */ 2273c1a5d5f6STahsin Erdogan if (ext4_handle_valid(handle)) { 2274dec214d0STahsin Erdogan struct buffer_head *bh; 2275c1a5d5f6STahsin Erdogan int credits; 2276c1a5d5f6STahsin Erdogan 2277dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2278dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2279dec214d0STahsin Erdogan error = PTR_ERR(bh); 2280dec214d0STahsin Erdogan goto cleanup; 2281dec214d0STahsin Erdogan } 2282dec214d0STahsin Erdogan 2283af65207cSTahsin Erdogan credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2284af65207cSTahsin Erdogan value_len, 2285af65207cSTahsin Erdogan flags & XATTR_CREATE); 2286dec214d0STahsin Erdogan brelse(bh); 2287dec214d0STahsin Erdogan 2288c1a5d5f6STahsin Erdogan if (!ext4_handle_has_enough_credits(handle, credits)) { 2289c1a5d5f6STahsin Erdogan error = -ENOSPC; 2290c1a5d5f6STahsin Erdogan goto cleanup; 2291c1a5d5f6STahsin Erdogan } 2292c1a5d5f6STahsin Erdogan } 2293c1a5d5f6STahsin Erdogan 229466543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 229586ebfd08SEric Sandeen if (error) 229686ebfd08SEric Sandeen goto cleanup; 229786ebfd08SEric Sandeen 229819f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 2299617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 2300617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 230119f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 2302ac27a0ecSDave Kleikamp } 2303ac27a0ecSDave Kleikamp 2304617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 2305ac27a0ecSDave Kleikamp if (error) 2306ac27a0ecSDave Kleikamp goto cleanup; 2307ac27a0ecSDave Kleikamp if (is.s.not_found) 2308617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 2309ac27a0ecSDave Kleikamp if (error) 2310ac27a0ecSDave Kleikamp goto cleanup; 2311ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 2312ac27a0ecSDave Kleikamp error = -ENODATA; 2313ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 2314ac27a0ecSDave Kleikamp goto cleanup; 2315ac27a0ecSDave Kleikamp error = 0; 2316ac27a0ecSDave Kleikamp if (!value) 2317ac27a0ecSDave Kleikamp goto cleanup; 2318ac27a0ecSDave Kleikamp } else { 2319ac27a0ecSDave Kleikamp error = -EEXIST; 2320ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 2321ac27a0ecSDave Kleikamp goto cleanup; 2322ac27a0ecSDave Kleikamp } 2323dec214d0STahsin Erdogan 2324ac27a0ecSDave Kleikamp if (!value) { 2325ac27a0ecSDave Kleikamp if (!is.s.not_found) 2326e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2327ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 2328617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2329ac27a0ecSDave Kleikamp } else { 23303fd16462SJan Kara error = 0; 23313fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 23323fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 23333fd16462SJan Kara goto cleanup; 23343fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 23353fd16462SJan Kara goto cleanup; 23363fd16462SJan Kara 2337b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2338b347e2bcSTahsin Erdogan (EXT4_XATTR_SIZE(i.value_len) > 2339b347e2bcSTahsin Erdogan EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) 2340b347e2bcSTahsin Erdogan i.in_inode = 1; 2341b347e2bcSTahsin Erdogan retry_inode: 2342e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2343ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 2344ac27a0ecSDave Kleikamp i.value = NULL; 2345617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2346ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 23477e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 23487e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 23497e01c8e5STiger Yang if (error) 23507e01c8e5STiger Yang goto cleanup; 23517e01c8e5STiger Yang } 2352617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2353b347e2bcSTahsin Erdogan if (!error && !is.s.not_found) { 2354ac27a0ecSDave Kleikamp i.value = NULL; 2355e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, 2356e50e5129SAndreas Dilger &is); 2357b347e2bcSTahsin Erdogan } else if (error == -ENOSPC) { 2358b347e2bcSTahsin Erdogan /* 2359b347e2bcSTahsin Erdogan * Xattr does not fit in the block, store at 2360b347e2bcSTahsin Erdogan * external inode if possible. 2361b347e2bcSTahsin Erdogan */ 2362b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2363b347e2bcSTahsin Erdogan !i.in_inode) { 2364b347e2bcSTahsin Erdogan i.in_inode = 1; 2365b347e2bcSTahsin Erdogan goto retry_inode; 2366b347e2bcSTahsin Erdogan } 2367ac27a0ecSDave Kleikamp } 2368ac27a0ecSDave Kleikamp } 2369ac27a0ecSDave Kleikamp } 2370ac27a0ecSDave Kleikamp if (!error) { 2371617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 2372eeca7ea1SDeepa Dinamani inode->i_ctime = current_time(inode); 23736dd4ee7cSKalpak Shah if (!value) 2374c755e251STheodore Ts'o no_expand = 0; 2375617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 2376ac27a0ecSDave Kleikamp /* 2377617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 2378ac27a0ecSDave Kleikamp * error != 0. 2379ac27a0ecSDave Kleikamp */ 2380ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 2381ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 23820390131bSFrank Mayhar ext4_handle_sync(handle); 2383ac27a0ecSDave Kleikamp } 2384ac27a0ecSDave Kleikamp 2385ac27a0ecSDave Kleikamp cleanup: 2386ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 2387ac27a0ecSDave Kleikamp brelse(bs.bh); 2388c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 2389ac27a0ecSDave Kleikamp return error; 2390ac27a0ecSDave Kleikamp } 2391ac27a0ecSDave Kleikamp 2392af65207cSTahsin Erdogan int ext4_xattr_set_credits(struct inode *inode, size_t value_len, 2393af65207cSTahsin Erdogan bool is_create, int *credits) 2394c1a5d5f6STahsin Erdogan { 2395dec214d0STahsin Erdogan struct buffer_head *bh; 2396dec214d0STahsin Erdogan int err; 2397c1a5d5f6STahsin Erdogan 2398dec214d0STahsin Erdogan *credits = 0; 2399dec214d0STahsin Erdogan 2400dec214d0STahsin Erdogan if (!EXT4_SB(inode->i_sb)->s_journal) 2401c1a5d5f6STahsin Erdogan return 0; 2402c1a5d5f6STahsin Erdogan 2403dec214d0STahsin Erdogan down_read(&EXT4_I(inode)->xattr_sem); 2404c1a5d5f6STahsin Erdogan 2405dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2406dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2407dec214d0STahsin Erdogan err = PTR_ERR(bh); 2408dec214d0STahsin Erdogan } else { 2409af65207cSTahsin Erdogan *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2410af65207cSTahsin Erdogan value_len, is_create); 2411dec214d0STahsin Erdogan brelse(bh); 2412dec214d0STahsin Erdogan err = 0; 2413c1a5d5f6STahsin Erdogan } 2414dec214d0STahsin Erdogan 2415dec214d0STahsin Erdogan up_read(&EXT4_I(inode)->xattr_sem); 2416dec214d0STahsin Erdogan return err; 2417c1a5d5f6STahsin Erdogan } 2418c1a5d5f6STahsin Erdogan 2419ac27a0ecSDave Kleikamp /* 2420617ba13bSMingming Cao * ext4_xattr_set() 2421ac27a0ecSDave Kleikamp * 2422617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 2423ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 2424ac27a0ecSDave Kleikamp * 2425ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2426ac27a0ecSDave Kleikamp */ 2427ac27a0ecSDave Kleikamp int 2428617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 2429ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 2430ac27a0ecSDave Kleikamp { 2431ac27a0ecSDave Kleikamp handle_t *handle; 2432e50e5129SAndreas Dilger struct super_block *sb = inode->i_sb; 2433ac27a0ecSDave Kleikamp int error, retries = 0; 2434c1a5d5f6STahsin Erdogan int credits; 2435ac27a0ecSDave Kleikamp 2436b8cb5a54STahsin Erdogan error = dquot_initialize(inode); 2437b8cb5a54STahsin Erdogan if (error) 2438b8cb5a54STahsin Erdogan return error; 2439e50e5129SAndreas Dilger 2440ac27a0ecSDave Kleikamp retry: 2441af65207cSTahsin Erdogan error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, 2442af65207cSTahsin Erdogan &credits); 2443dec214d0STahsin Erdogan if (error) 2444dec214d0STahsin Erdogan return error; 2445dec214d0STahsin Erdogan 24469924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 2447ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 2448ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 2449ac27a0ecSDave Kleikamp } else { 2450ac27a0ecSDave Kleikamp int error2; 2451ac27a0ecSDave Kleikamp 2452617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 2453ac27a0ecSDave Kleikamp value, value_len, flags); 2454617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 2455ac27a0ecSDave Kleikamp if (error == -ENOSPC && 2456e50e5129SAndreas Dilger ext4_should_retry_alloc(sb, &retries)) 2457ac27a0ecSDave Kleikamp goto retry; 2458ac27a0ecSDave Kleikamp if (error == 0) 2459ac27a0ecSDave Kleikamp error = error2; 2460ac27a0ecSDave Kleikamp } 2461ac27a0ecSDave Kleikamp 2462ac27a0ecSDave Kleikamp return error; 2463ac27a0ecSDave Kleikamp } 2464ac27a0ecSDave Kleikamp 2465ac27a0ecSDave Kleikamp /* 24666dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 24676dd4ee7cSKalpak Shah * i_extra_isize. 24686dd4ee7cSKalpak Shah */ 24696dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 24706dd4ee7cSKalpak Shah int value_offs_shift, void *to, 247194405713SJan Kara void *from, size_t n) 24726dd4ee7cSKalpak Shah { 24736dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 24746dd4ee7cSKalpak Shah int new_offs; 24756dd4ee7cSKalpak Shah 247694405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 247794405713SJan Kara BUG_ON(value_offs_shift > 0); 247894405713SJan Kara 24796dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 24806dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 2481e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 24826dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 24836dd4ee7cSKalpak Shah value_offs_shift; 24846dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 24856dd4ee7cSKalpak Shah } 24866dd4ee7cSKalpak Shah } 24876dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 24886dd4ee7cSKalpak Shah memmove(to, from, n); 24896dd4ee7cSKalpak Shah } 24906dd4ee7cSKalpak Shah 24916dd4ee7cSKalpak Shah /* 24923f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 24933f2571c1SJan Kara */ 24943f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 24953f2571c1SJan Kara struct ext4_inode *raw_inode, 24963f2571c1SJan Kara struct ext4_xattr_entry *entry) 24973f2571c1SJan Kara { 24983f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 24993f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 25003f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 2501f6109100STahsin Erdogan size_t value_size = le32_to_cpu(entry->e_value_size); 25023f2571c1SJan Kara struct ext4_xattr_info i = { 25033f2571c1SJan Kara .value = NULL, 25043f2571c1SJan Kara .value_len = 0, 25053f2571c1SJan Kara .name_index = entry->e_name_index, 2506f6109100STahsin Erdogan .in_inode = !!entry->e_value_inum, 25073f2571c1SJan Kara }; 25083f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 25093f2571c1SJan Kara int error; 25103f2571c1SJan Kara 25113f2571c1SJan Kara is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 25123f2571c1SJan Kara bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 25133f2571c1SJan Kara buffer = kmalloc(value_size, GFP_NOFS); 25143f2571c1SJan Kara b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 25153f2571c1SJan Kara if (!is || !bs || !buffer || !b_entry_name) { 25163f2571c1SJan Kara error = -ENOMEM; 25173f2571c1SJan Kara goto out; 25183f2571c1SJan Kara } 25193f2571c1SJan Kara 25203f2571c1SJan Kara is->s.not_found = -ENODATA; 25213f2571c1SJan Kara bs->s.not_found = -ENODATA; 25223f2571c1SJan Kara is->iloc.bh = NULL; 25233f2571c1SJan Kara bs->bh = NULL; 25243f2571c1SJan Kara 25253f2571c1SJan Kara /* Save the entry name and the entry value */ 2526f6109100STahsin Erdogan if (entry->e_value_inum) { 2527b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, value_size); 2528f6109100STahsin Erdogan if (error) 2529f6109100STahsin Erdogan goto out; 2530f6109100STahsin Erdogan } else { 2531f6109100STahsin Erdogan size_t value_offs = le16_to_cpu(entry->e_value_offs); 25323f2571c1SJan Kara memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); 2533f6109100STahsin Erdogan } 2534f6109100STahsin Erdogan 25353f2571c1SJan Kara memcpy(b_entry_name, entry->e_name, entry->e_name_len); 25363f2571c1SJan Kara b_entry_name[entry->e_name_len] = '\0'; 25373f2571c1SJan Kara i.name = b_entry_name; 25383f2571c1SJan Kara 25393f2571c1SJan Kara error = ext4_get_inode_loc(inode, &is->iloc); 25403f2571c1SJan Kara if (error) 25413f2571c1SJan Kara goto out; 25423f2571c1SJan Kara 25433f2571c1SJan Kara error = ext4_xattr_ibody_find(inode, &i, is); 25443f2571c1SJan Kara if (error) 25453f2571c1SJan Kara goto out; 25463f2571c1SJan Kara 25473f2571c1SJan Kara /* Remove the chosen entry from the inode */ 2548e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, is); 25493f2571c1SJan Kara if (error) 25503f2571c1SJan Kara goto out; 25513f2571c1SJan Kara 25523f2571c1SJan Kara i.value = buffer; 25533f2571c1SJan Kara i.value_len = value_size; 25543f2571c1SJan Kara error = ext4_xattr_block_find(inode, &i, bs); 25553f2571c1SJan Kara if (error) 25563f2571c1SJan Kara goto out; 25573f2571c1SJan Kara 25583f2571c1SJan Kara /* Add entry which was removed from the inode into the block */ 25593f2571c1SJan Kara error = ext4_xattr_block_set(handle, inode, &i, bs); 25603f2571c1SJan Kara if (error) 25613f2571c1SJan Kara goto out; 25623f2571c1SJan Kara error = 0; 25633f2571c1SJan Kara out: 25643f2571c1SJan Kara kfree(b_entry_name); 25653f2571c1SJan Kara kfree(buffer); 25663f2571c1SJan Kara if (is) 25673f2571c1SJan Kara brelse(is->iloc.bh); 25683f2571c1SJan Kara kfree(is); 25693f2571c1SJan Kara kfree(bs); 25703f2571c1SJan Kara 25713f2571c1SJan Kara return error; 25723f2571c1SJan Kara } 25733f2571c1SJan Kara 2574dfa2064bSJan Kara static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, 2575dfa2064bSJan Kara struct ext4_inode *raw_inode, 2576dfa2064bSJan Kara int isize_diff, size_t ifree, 2577dfa2064bSJan Kara size_t bfree, int *total_ino) 2578dfa2064bSJan Kara { 2579dfa2064bSJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 2580dfa2064bSJan Kara struct ext4_xattr_entry *small_entry; 2581dfa2064bSJan Kara struct ext4_xattr_entry *entry; 2582dfa2064bSJan Kara struct ext4_xattr_entry *last; 2583dfa2064bSJan Kara unsigned int entry_size; /* EA entry size */ 2584dfa2064bSJan Kara unsigned int total_size; /* EA entry size + value size */ 2585dfa2064bSJan Kara unsigned int min_total_size; 2586dfa2064bSJan Kara int error; 2587dfa2064bSJan Kara 2588dfa2064bSJan Kara while (isize_diff > ifree) { 2589dfa2064bSJan Kara entry = NULL; 2590dfa2064bSJan Kara small_entry = NULL; 2591dfa2064bSJan Kara min_total_size = ~0U; 2592dfa2064bSJan Kara last = IFIRST(header); 2593dfa2064bSJan Kara /* Find the entry best suited to be pushed into EA block */ 2594dfa2064bSJan Kara for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 25959bb21cedSTahsin Erdogan total_size = EXT4_XATTR_LEN(last->e_name_len); 25969bb21cedSTahsin Erdogan if (!last->e_value_inum) 25979bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 25989bb21cedSTahsin Erdogan le32_to_cpu(last->e_value_size)); 2599dfa2064bSJan Kara if (total_size <= bfree && 2600dfa2064bSJan Kara total_size < min_total_size) { 2601dfa2064bSJan Kara if (total_size + ifree < isize_diff) { 2602dfa2064bSJan Kara small_entry = last; 2603dfa2064bSJan Kara } else { 2604dfa2064bSJan Kara entry = last; 2605dfa2064bSJan Kara min_total_size = total_size; 2606dfa2064bSJan Kara } 2607dfa2064bSJan Kara } 2608dfa2064bSJan Kara } 2609dfa2064bSJan Kara 2610dfa2064bSJan Kara if (entry == NULL) { 2611dfa2064bSJan Kara if (small_entry == NULL) 2612dfa2064bSJan Kara return -ENOSPC; 2613dfa2064bSJan Kara entry = small_entry; 2614dfa2064bSJan Kara } 2615dfa2064bSJan Kara 2616dfa2064bSJan Kara entry_size = EXT4_XATTR_LEN(entry->e_name_len); 26179bb21cedSTahsin Erdogan total_size = entry_size; 26189bb21cedSTahsin Erdogan if (!entry->e_value_inum) 26199bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 26209bb21cedSTahsin Erdogan le32_to_cpu(entry->e_value_size)); 2621dfa2064bSJan Kara error = ext4_xattr_move_to_block(handle, inode, raw_inode, 2622dfa2064bSJan Kara entry); 2623dfa2064bSJan Kara if (error) 2624dfa2064bSJan Kara return error; 2625dfa2064bSJan Kara 2626dfa2064bSJan Kara *total_ino -= entry_size; 2627dfa2064bSJan Kara ifree += total_size; 2628dfa2064bSJan Kara bfree -= total_size; 2629dfa2064bSJan Kara } 2630dfa2064bSJan Kara 2631dfa2064bSJan Kara return 0; 2632dfa2064bSJan Kara } 2633dfa2064bSJan Kara 26343f2571c1SJan Kara /* 26356dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 26366dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 26376dd4ee7cSKalpak Shah */ 26386dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 26396dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 26406dd4ee7cSKalpak Shah { 26416dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 2642b640b2c5SMiao Xie struct buffer_head *bh; 2643cf0a5e81SMiao Xie struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 2644cf0a5e81SMiao Xie static unsigned int mnt_count; 2645e3014d14SJan Kara size_t min_offs; 2646e3014d14SJan Kara size_t ifree, bfree; 26477b1b2c1bSTheodore Ts'o int total_ino; 26486e0cd088SJan Kara void *base, *end; 2649d0141191SJan Kara int error = 0, tried_min_extra_isize = 0; 2650cf0a5e81SMiao Xie int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); 2651d0141191SJan Kara int isize_diff; /* How much do we need to grow i_extra_isize */ 2652c755e251STheodore Ts'o 26536dd4ee7cSKalpak Shah retry: 2654d0141191SJan Kara isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; 26552e81a4eeSJan Kara if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) 2656b640b2c5SMiao Xie return 0; 26576dd4ee7cSKalpak Shah 26586dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 26596dd4ee7cSKalpak Shah 26606dd4ee7cSKalpak Shah /* 26616dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 26626dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 26636dd4ee7cSKalpak Shah */ 26646dd4ee7cSKalpak Shah 26656e0cd088SJan Kara base = IFIRST(header); 26666dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 26676dd4ee7cSKalpak Shah min_offs = end - base; 26686dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 26696dd4ee7cSKalpak Shah 26709e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 26719e92f48cSTheodore Ts'o if (error) 26729e92f48cSTheodore Ts'o goto cleanup; 26739e92f48cSTheodore Ts'o 26746e0cd088SJan Kara ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); 2675e3014d14SJan Kara if (ifree >= isize_diff) 2676e3014d14SJan Kara goto shift; 26776dd4ee7cSKalpak Shah 26786dd4ee7cSKalpak Shah /* 26796dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 26806dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 26816dd4ee7cSKalpak Shah */ 26826dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 26836dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 26846dd4ee7cSKalpak Shah error = -EIO; 26856dd4ee7cSKalpak Shah if (!bh) 26866dd4ee7cSKalpak Shah goto cleanup; 2687cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 268824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 268924676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 26906a797d27SDarrick J. Wong error = -EFSCORRUPTED; 2691b640b2c5SMiao Xie brelse(bh); 26926dd4ee7cSKalpak Shah goto cleanup; 26936dd4ee7cSKalpak Shah } 26946dd4ee7cSKalpak Shah base = BHDR(bh); 26956dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 26966dd4ee7cSKalpak Shah min_offs = end - base; 26976e0cd088SJan Kara bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, 26986e0cd088SJan Kara NULL); 2699b640b2c5SMiao Xie brelse(bh); 2700e3014d14SJan Kara if (bfree + ifree < isize_diff) { 27016dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 27026dd4ee7cSKalpak Shah tried_min_extra_isize++; 27036dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 27046dd4ee7cSKalpak Shah goto retry; 27056dd4ee7cSKalpak Shah } 2706dfa2064bSJan Kara error = -ENOSPC; 27076dd4ee7cSKalpak Shah goto cleanup; 27086dd4ee7cSKalpak Shah } 27096dd4ee7cSKalpak Shah } else { 2710e3014d14SJan Kara bfree = inode->i_sb->s_blocksize; 27116dd4ee7cSKalpak Shah } 27126dd4ee7cSKalpak Shah 2713dfa2064bSJan Kara error = ext4_xattr_make_inode_space(handle, inode, raw_inode, 2714dfa2064bSJan Kara isize_diff, ifree, bfree, 2715dfa2064bSJan Kara &total_ino); 2716dfa2064bSJan Kara if (error) { 2717dfa2064bSJan Kara if (error == -ENOSPC && !tried_min_extra_isize && 27186dd4ee7cSKalpak Shah s_min_extra_isize) { 27196dd4ee7cSKalpak Shah tried_min_extra_isize++; 27206dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 27216dd4ee7cSKalpak Shah goto retry; 27226dd4ee7cSKalpak Shah } 27236dd4ee7cSKalpak Shah goto cleanup; 27246dd4ee7cSKalpak Shah } 2725e3014d14SJan Kara shift: 2726e3014d14SJan Kara /* Adjust the offsets and shift the remaining entries ahead */ 27276e0cd088SJan Kara ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize 2728e3014d14SJan Kara - new_extra_isize, (void *)raw_inode + 2729e3014d14SJan Kara EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 273094405713SJan Kara (void *)header, total_ino); 2731e3014d14SJan Kara EXT4_I(inode)->i_extra_isize = new_extra_isize; 27326dd4ee7cSKalpak Shah 27336dd4ee7cSKalpak Shah cleanup: 2734b640b2c5SMiao Xie if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) { 2735cf0a5e81SMiao Xie ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", 2736cf0a5e81SMiao Xie inode->i_ino); 2737cf0a5e81SMiao Xie mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); 2738cf0a5e81SMiao Xie } 27396dd4ee7cSKalpak Shah return error; 27406dd4ee7cSKalpak Shah } 27416dd4ee7cSKalpak Shah 2742e50e5129SAndreas Dilger #define EIA_INCR 16 /* must be 2^n */ 2743e50e5129SAndreas Dilger #define EIA_MASK (EIA_INCR - 1) 2744dec214d0STahsin Erdogan 2745dec214d0STahsin Erdogan /* Add the large xattr @inode into @ea_inode_array for deferred iput(). 27460421a189STahsin Erdogan * If @ea_inode_array is new or full it will be grown and the old 2747e50e5129SAndreas Dilger * contents copied over. 2748e50e5129SAndreas Dilger */ 2749e50e5129SAndreas Dilger static int 27500421a189STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 27510421a189STahsin Erdogan struct inode *inode) 2752e50e5129SAndreas Dilger { 27530421a189STahsin Erdogan if (*ea_inode_array == NULL) { 2754e50e5129SAndreas Dilger /* 2755e50e5129SAndreas Dilger * Start with 15 inodes, so it fits into a power-of-two size. 27560421a189STahsin Erdogan * If *ea_inode_array is NULL, this is essentially offsetof() 2757e50e5129SAndreas Dilger */ 27580421a189STahsin Erdogan (*ea_inode_array) = 27590421a189STahsin Erdogan kmalloc(offsetof(struct ext4_xattr_inode_array, 27600421a189STahsin Erdogan inodes[EIA_MASK]), 2761e50e5129SAndreas Dilger GFP_NOFS); 27620421a189STahsin Erdogan if (*ea_inode_array == NULL) 2763e50e5129SAndreas Dilger return -ENOMEM; 27640421a189STahsin Erdogan (*ea_inode_array)->count = 0; 27650421a189STahsin Erdogan } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { 2766e50e5129SAndreas Dilger /* expand the array once all 15 + n * 16 slots are full */ 27670421a189STahsin Erdogan struct ext4_xattr_inode_array *new_array = NULL; 27680421a189STahsin Erdogan int count = (*ea_inode_array)->count; 2769e50e5129SAndreas Dilger 2770e50e5129SAndreas Dilger /* if new_array is NULL, this is essentially offsetof() */ 2771e50e5129SAndreas Dilger new_array = kmalloc( 27720421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, 27730421a189STahsin Erdogan inodes[count + EIA_INCR]), 2774e50e5129SAndreas Dilger GFP_NOFS); 2775e50e5129SAndreas Dilger if (new_array == NULL) 2776e50e5129SAndreas Dilger return -ENOMEM; 27770421a189STahsin Erdogan memcpy(new_array, *ea_inode_array, 27780421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, inodes[count])); 27790421a189STahsin Erdogan kfree(*ea_inode_array); 27800421a189STahsin Erdogan *ea_inode_array = new_array; 2781e50e5129SAndreas Dilger } 27820421a189STahsin Erdogan (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; 2783e50e5129SAndreas Dilger return 0; 2784e50e5129SAndreas Dilger } 2785e50e5129SAndreas Dilger 27866dd4ee7cSKalpak Shah /* 2787617ba13bSMingming Cao * ext4_xattr_delete_inode() 2788ac27a0ecSDave Kleikamp * 2789e50e5129SAndreas Dilger * Free extended attribute resources associated with this inode. Traverse 2790dec214d0STahsin Erdogan * all entries and decrement reference on any xattr inodes associated with this 2791dec214d0STahsin Erdogan * inode. This is called immediately before an inode is freed. We have exclusive 2792dec214d0STahsin Erdogan * access to the inode. If an orphan inode is deleted it will also release its 2793dec214d0STahsin Erdogan * references on xattr block and xattr inodes. 2794ac27a0ecSDave Kleikamp */ 2795dec214d0STahsin Erdogan int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, 279630a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 279730a7eb97STahsin Erdogan int extra_credits) 2798ac27a0ecSDave Kleikamp { 2799ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 2800e50e5129SAndreas Dilger struct ext4_xattr_ibody_header *header; 280130a7eb97STahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 2802dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 280330a7eb97STahsin Erdogan int error; 280430a7eb97STahsin Erdogan 280530a7eb97STahsin Erdogan error = ext4_xattr_ensure_credits(handle, inode, extra_credits, 280630a7eb97STahsin Erdogan NULL /* bh */, 280730a7eb97STahsin Erdogan false /* dirty */, 280830a7eb97STahsin Erdogan false /* block_csum */); 280930a7eb97STahsin Erdogan if (error) { 281030a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); 281130a7eb97STahsin Erdogan goto cleanup; 281230a7eb97STahsin Erdogan } 2813ac27a0ecSDave Kleikamp 2814dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2815dec214d0STahsin Erdogan ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 2816e50e5129SAndreas Dilger 2817e50e5129SAndreas Dilger error = ext4_get_inode_loc(inode, &iloc); 2818dec214d0STahsin Erdogan if (error) { 2819dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); 2820e50e5129SAndreas Dilger goto cleanup; 2821e50e5129SAndreas Dilger } 2822dec214d0STahsin Erdogan 2823dec214d0STahsin Erdogan error = ext4_journal_get_write_access(handle, iloc.bh); 2824dec214d0STahsin Erdogan if (error) { 2825dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "write access (error %d)", 2826dec214d0STahsin Erdogan error); 2827dec214d0STahsin Erdogan goto cleanup; 2828dec214d0STahsin Erdogan } 2829dec214d0STahsin Erdogan 2830dec214d0STahsin Erdogan header = IHDR(inode, ext4_raw_inode(&iloc)); 2831dec214d0STahsin Erdogan if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) 2832dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, 2833dec214d0STahsin Erdogan IFIRST(header), 2834dec214d0STahsin Erdogan false /* block_csum */, 2835dec214d0STahsin Erdogan ea_inode_array, 2836dec214d0STahsin Erdogan extra_credits, 2837dec214d0STahsin Erdogan false /* skip_quota */); 2838dec214d0STahsin Erdogan } 2839dec214d0STahsin Erdogan 2840dec214d0STahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 2841617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 2842ac27a0ecSDave Kleikamp if (!bh) { 284324676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 284424676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 284565d30005STahsin Erdogan error = -EIO; 2846ac27a0ecSDave Kleikamp goto cleanup; 2847ac27a0ecSDave Kleikamp } 2848dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2849dec214d0STahsin Erdogan if (error) { 2850dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "bad block %llu (error %d)", 2851dec214d0STahsin Erdogan EXT4_I(inode)->i_file_acl, error); 2852ac27a0ecSDave Kleikamp goto cleanup; 2853ac27a0ecSDave Kleikamp } 2854e50e5129SAndreas Dilger 285530a7eb97STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) { 2856dec214d0STahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 2857dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 2858dec214d0STahsin Erdogan if (entry->e_value_inum) 2859dec214d0STahsin Erdogan ext4_xattr_inode_free_quota(inode, 2860dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 2861dec214d0STahsin Erdogan 2862e50e5129SAndreas Dilger } 2863e50e5129SAndreas Dilger 2864dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bh, ea_inode_array, 2865dec214d0STahsin Erdogan extra_credits); 2866dec214d0STahsin Erdogan /* 2867dec214d0STahsin Erdogan * Update i_file_acl value in the same transaction that releases 2868dec214d0STahsin Erdogan * block. 2869dec214d0STahsin Erdogan */ 2870617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 287130a7eb97STahsin Erdogan error = ext4_mark_inode_dirty(handle, inode); 287230a7eb97STahsin Erdogan if (error) { 287330a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", 287430a7eb97STahsin Erdogan error); 287530a7eb97STahsin Erdogan goto cleanup; 287630a7eb97STahsin Erdogan } 2877dec214d0STahsin Erdogan } 2878dec214d0STahsin Erdogan error = 0; 2879ac27a0ecSDave Kleikamp cleanup: 288030a7eb97STahsin Erdogan brelse(iloc.bh); 2881ac27a0ecSDave Kleikamp brelse(bh); 2882e50e5129SAndreas Dilger return error; 2883e50e5129SAndreas Dilger } 2884e50e5129SAndreas Dilger 28850421a189STahsin Erdogan void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) 2886e50e5129SAndreas Dilger { 2887dec214d0STahsin Erdogan int idx; 2888e50e5129SAndreas Dilger 28890421a189STahsin Erdogan if (ea_inode_array == NULL) 2890e50e5129SAndreas Dilger return; 2891e50e5129SAndreas Dilger 2892dec214d0STahsin Erdogan for (idx = 0; idx < ea_inode_array->count; ++idx) 2893dec214d0STahsin Erdogan iput(ea_inode_array->inodes[idx]); 28940421a189STahsin Erdogan kfree(ea_inode_array); 2895ac27a0ecSDave Kleikamp } 2896ac27a0ecSDave Kleikamp 2897ac27a0ecSDave Kleikamp /* 289847387409STahsin Erdogan * ext4_xattr_block_cache_insert() 2899ac27a0ecSDave Kleikamp * 290047387409STahsin Erdogan * Create a new entry in the extended attribute block cache, and insert 2901ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 2902ac27a0ecSDave Kleikamp * 2903ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2904ac27a0ecSDave Kleikamp */ 2905ac27a0ecSDave Kleikamp static void 290647387409STahsin Erdogan ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, 290747387409STahsin Erdogan struct buffer_head *bh) 2908ac27a0ecSDave Kleikamp { 29096048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 29106048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 29116048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 29126048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 2913ac27a0ecSDave Kleikamp int error; 2914ac27a0ecSDave Kleikamp 2915cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 2916cdb7ee4cSTahsin Erdogan return; 291747387409STahsin Erdogan error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, 29186048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 2919ac27a0ecSDave Kleikamp if (error) { 292082939d79SJan Kara if (error == -EBUSY) 2921ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 292282939d79SJan Kara } else 2923ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 2924ac27a0ecSDave Kleikamp } 2925ac27a0ecSDave Kleikamp 2926ac27a0ecSDave Kleikamp /* 2927617ba13bSMingming Cao * ext4_xattr_cmp() 2928ac27a0ecSDave Kleikamp * 2929ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 2930ac27a0ecSDave Kleikamp * 2931ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 2932ac27a0ecSDave Kleikamp * a negative error number on errors. 2933ac27a0ecSDave Kleikamp */ 2934ac27a0ecSDave Kleikamp static int 2935617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 2936617ba13bSMingming Cao struct ext4_xattr_header *header2) 2937ac27a0ecSDave Kleikamp { 2938617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 2939ac27a0ecSDave Kleikamp 2940ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 2941ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 2942ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 2943ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 2944ac27a0ecSDave Kleikamp return 1; 2945ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 2946ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 2947ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 2948ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 2949e50e5129SAndreas Dilger entry1->e_value_inum != entry2->e_value_inum || 2950ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 2951ac27a0ecSDave Kleikamp return 1; 29527cec1918STahsin Erdogan if (!entry1->e_value_inum && 29537cec1918STahsin Erdogan memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 2954ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 2955ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 2956ac27a0ecSDave Kleikamp return 1; 2957ac27a0ecSDave Kleikamp 2958617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 2959617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 2960ac27a0ecSDave Kleikamp } 2961ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 2962ac27a0ecSDave Kleikamp return 1; 2963ac27a0ecSDave Kleikamp return 0; 2964ac27a0ecSDave Kleikamp } 2965ac27a0ecSDave Kleikamp 2966ac27a0ecSDave Kleikamp /* 296747387409STahsin Erdogan * ext4_xattr_block_cache_find() 2968ac27a0ecSDave Kleikamp * 2969ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 2970ac27a0ecSDave Kleikamp * 2971ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 2972ac27a0ecSDave Kleikamp * not found or an error occurred. 2973ac27a0ecSDave Kleikamp */ 2974ac27a0ecSDave Kleikamp static struct buffer_head * 297547387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *inode, 297647387409STahsin Erdogan struct ext4_xattr_header *header, 29777a2508e1SJan Kara struct mb_cache_entry **pce) 2978ac27a0ecSDave Kleikamp { 2979ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 29807a2508e1SJan Kara struct mb_cache_entry *ce; 298147387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 2982ac27a0ecSDave Kleikamp 2983cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 2984cdb7ee4cSTahsin Erdogan return NULL; 2985ac27a0ecSDave Kleikamp if (!header->h_hash) 2986ac27a0ecSDave Kleikamp return NULL; /* never share */ 2987ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 298847387409STahsin Erdogan ce = mb_cache_entry_find_first(ea_block_cache, hash); 2989ac27a0ecSDave Kleikamp while (ce) { 2990ac27a0ecSDave Kleikamp struct buffer_head *bh; 2991ac27a0ecSDave Kleikamp 2992c07dfcb4STahsin Erdogan bh = sb_bread(inode->i_sb, ce->e_value); 2993ac27a0ecSDave Kleikamp if (!bh) { 299424676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 2995c07dfcb4STahsin Erdogan (unsigned long)ce->e_value); 2996617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 2997ac27a0ecSDave Kleikamp *pce = ce; 2998ac27a0ecSDave Kleikamp return bh; 2999ac27a0ecSDave Kleikamp } 3000ac27a0ecSDave Kleikamp brelse(bh); 300147387409STahsin Erdogan ce = mb_cache_entry_find_next(ea_block_cache, ce); 3002ac27a0ecSDave Kleikamp } 3003ac27a0ecSDave Kleikamp return NULL; 3004ac27a0ecSDave Kleikamp } 3005ac27a0ecSDave Kleikamp 3006ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 3007ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 3008ac27a0ecSDave Kleikamp 3009ac27a0ecSDave Kleikamp /* 3010617ba13bSMingming Cao * ext4_xattr_hash_entry() 3011ac27a0ecSDave Kleikamp * 3012ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 3013ac27a0ecSDave Kleikamp */ 3014b9fc761eSTahsin Erdogan static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, 3015b9fc761eSTahsin Erdogan size_t value_count) 3016ac27a0ecSDave Kleikamp { 3017ac27a0ecSDave Kleikamp __u32 hash = 0; 3018ac27a0ecSDave Kleikamp 3019b9fc761eSTahsin Erdogan while (name_len--) { 3020ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 3021ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 3022ac27a0ecSDave Kleikamp *name++; 3023ac27a0ecSDave Kleikamp } 3024b9fc761eSTahsin Erdogan while (value_count--) { 3025ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 3026ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 3027ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 3028ac27a0ecSDave Kleikamp } 3029b9fc761eSTahsin Erdogan return cpu_to_le32(hash); 3030ac27a0ecSDave Kleikamp } 3031ac27a0ecSDave Kleikamp 3032ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 3033ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 3034ac27a0ecSDave Kleikamp 3035ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 3036ac27a0ecSDave Kleikamp 3037ac27a0ecSDave Kleikamp /* 3038617ba13bSMingming Cao * ext4_xattr_rehash() 3039ac27a0ecSDave Kleikamp * 3040ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 3041ac27a0ecSDave Kleikamp */ 3042daf83281STahsin Erdogan static void ext4_xattr_rehash(struct ext4_xattr_header *header) 3043ac27a0ecSDave Kleikamp { 3044617ba13bSMingming Cao struct ext4_xattr_entry *here; 3045ac27a0ecSDave Kleikamp __u32 hash = 0; 3046ac27a0ecSDave Kleikamp 3047ac27a0ecSDave Kleikamp here = ENTRY(header+1); 3048ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 3049ac27a0ecSDave Kleikamp if (!here->e_hash) { 3050ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 3051ac27a0ecSDave Kleikamp hash = 0; 3052ac27a0ecSDave Kleikamp break; 3053ac27a0ecSDave Kleikamp } 3054ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 3055ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 3056ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 3057617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 3058ac27a0ecSDave Kleikamp } 3059ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 3060ac27a0ecSDave Kleikamp } 3061ac27a0ecSDave Kleikamp 3062ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 3063ac27a0ecSDave Kleikamp 30649c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 30659c191f70ST Makphaibulchoke 30667a2508e1SJan Kara struct mb_cache * 306782939d79SJan Kara ext4_xattr_create_cache(void) 3068ac27a0ecSDave Kleikamp { 30697a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 3070ac27a0ecSDave Kleikamp } 3071ac27a0ecSDave Kleikamp 30727a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 3073ac27a0ecSDave Kleikamp { 30749c191f70ST Makphaibulchoke if (cache) 30757a2508e1SJan Kara mb_cache_destroy(cache); 3076ac27a0ecSDave Kleikamp } 30779c191f70ST Makphaibulchoke 3078