1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 2ac27a0ecSDave Kleikamp /* 3617ba13bSMingming Cao * linux/fs/ext4/xattr.c 4ac27a0ecSDave Kleikamp * 5ac27a0ecSDave Kleikamp * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> 6ac27a0ecSDave Kleikamp * 7ac27a0ecSDave Kleikamp * Fix by Harrison Xing <harrison@mountainviewdata.com>. 8617ba13bSMingming Cao * Ext4 code with a lot of help from Eric Jarman <ejarman@acm.org>. 9ac27a0ecSDave Kleikamp * Extended attributes for symlinks and special files added per 10ac27a0ecSDave Kleikamp * suggestion of Luka Renko <luka.renko@hermes.si>. 11ac27a0ecSDave Kleikamp * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>, 12ac27a0ecSDave Kleikamp * Red Hat Inc. 13ac27a0ecSDave Kleikamp * ea-in-inode support by Alex Tomas <alex@clusterfs.com> aka bzzz 14ac27a0ecSDave Kleikamp * and Andreas Gruenbacher <agruen@suse.de>. 15ac27a0ecSDave Kleikamp */ 16ac27a0ecSDave Kleikamp 17ac27a0ecSDave Kleikamp /* 18ac27a0ecSDave Kleikamp * Extended attributes are stored directly in inodes (on file systems with 19ac27a0ecSDave Kleikamp * inodes bigger than 128 bytes) and on additional disk blocks. The i_file_acl 20ac27a0ecSDave Kleikamp * field contains the block number if an inode uses an additional block. All 21ac27a0ecSDave Kleikamp * attributes must fit in the inode and one additional block. Blocks that 22ac27a0ecSDave Kleikamp * contain the identical set of attributes may be shared among several inodes. 23ac27a0ecSDave Kleikamp * Identical blocks are detected by keeping a cache of blocks that have 24ac27a0ecSDave Kleikamp * recently been accessed. 25ac27a0ecSDave Kleikamp * 26ac27a0ecSDave Kleikamp * The attributes in inodes and on blocks have a different header; the entries 27ac27a0ecSDave Kleikamp * are stored in the same format: 28ac27a0ecSDave Kleikamp * 29ac27a0ecSDave Kleikamp * +------------------+ 30ac27a0ecSDave Kleikamp * | header | 31ac27a0ecSDave Kleikamp * | entry 1 | | 32ac27a0ecSDave Kleikamp * | entry 2 | | growing downwards 33ac27a0ecSDave Kleikamp * | entry 3 | v 34ac27a0ecSDave Kleikamp * | four null bytes | 35ac27a0ecSDave Kleikamp * | . . . | 36ac27a0ecSDave Kleikamp * | value 1 | ^ 37ac27a0ecSDave Kleikamp * | value 3 | | growing upwards 38ac27a0ecSDave Kleikamp * | value 2 | | 39ac27a0ecSDave Kleikamp * +------------------+ 40ac27a0ecSDave Kleikamp * 41ac27a0ecSDave Kleikamp * The header is followed by multiple entry descriptors. In disk blocks, the 42ac27a0ecSDave Kleikamp * entry descriptors are kept sorted. In inodes, they are unsorted. The 43ac27a0ecSDave Kleikamp * attribute values are aligned to the end of the block in no specific order. 44ac27a0ecSDave Kleikamp * 45ac27a0ecSDave Kleikamp * Locking strategy 46ac27a0ecSDave Kleikamp * ---------------- 47617ba13bSMingming Cao * EXT4_I(inode)->i_file_acl is protected by EXT4_I(inode)->xattr_sem. 48ac27a0ecSDave Kleikamp * EA blocks are only changed if they are exclusive to an inode, so 49ac27a0ecSDave Kleikamp * holding xattr_sem also means that nothing but the EA block's reference 50ac27a0ecSDave Kleikamp * count can change. Multiple writers to the same block are synchronized 51ac27a0ecSDave Kleikamp * by the buffer lock. 52ac27a0ecSDave Kleikamp */ 53ac27a0ecSDave Kleikamp 54ac27a0ecSDave Kleikamp #include <linux/init.h> 55ac27a0ecSDave Kleikamp #include <linux/fs.h> 56ac27a0ecSDave Kleikamp #include <linux/slab.h> 577a2508e1SJan Kara #include <linux/mbcache.h> 58ac27a0ecSDave Kleikamp #include <linux/quotaops.h> 59ee73f9a5SJeff Layton #include <linux/iversion.h> 603dcf5451SChristoph Hellwig #include "ext4_jbd2.h" 613dcf5451SChristoph Hellwig #include "ext4.h" 62ac27a0ecSDave Kleikamp #include "xattr.h" 63ac27a0ecSDave Kleikamp #include "acl.h" 64ac27a0ecSDave Kleikamp 65617ba13bSMingming Cao #ifdef EXT4_XATTR_DEBUG 66d74f3d25SJoe Perches # define ea_idebug(inode, fmt, ...) \ 67d74f3d25SJoe Perches printk(KERN_DEBUG "inode %s:%lu: " fmt "\n", \ 68d74f3d25SJoe Perches inode->i_sb->s_id, inode->i_ino, ##__VA_ARGS__) 69d74f3d25SJoe Perches # define ea_bdebug(bh, fmt, ...) \ 70d74f3d25SJoe Perches printk(KERN_DEBUG "block %pg:%lu: " fmt "\n", \ 71d74f3d25SJoe Perches bh->b_bdev, (unsigned long)bh->b_blocknr, ##__VA_ARGS__) 72ac27a0ecSDave Kleikamp #else 73ace36ad4SJoe Perches # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 74ace36ad4SJoe Perches # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 75ac27a0ecSDave Kleikamp #endif 76ac27a0ecSDave Kleikamp 7747387409STahsin Erdogan static void ext4_xattr_block_cache_insert(struct mb_cache *, 7847387409STahsin Erdogan struct buffer_head *); 7947387409STahsin Erdogan static struct buffer_head * 8047387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *, struct ext4_xattr_header *, 817a2508e1SJan Kara struct mb_cache_entry **); 82b9fc761eSTahsin Erdogan static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, 83b9fc761eSTahsin Erdogan size_t value_count); 84daf83281STahsin Erdogan static void ext4_xattr_rehash(struct ext4_xattr_header *); 85ac27a0ecSDave Kleikamp 86d6006186SEric Biggers static const struct xattr_handler * const ext4_xattr_handler_map[] = { 87617ba13bSMingming Cao [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, 8803010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 8964e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, 9064e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, 91ac27a0ecSDave Kleikamp #endif 92617ba13bSMingming Cao [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, 9303010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 94617ba13bSMingming Cao [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, 95ac27a0ecSDave Kleikamp #endif 96ac27a0ecSDave Kleikamp }; 97ac27a0ecSDave Kleikamp 9811e27528SStephen Hemminger const struct xattr_handler *ext4_xattr_handlers[] = { 99617ba13bSMingming Cao &ext4_xattr_user_handler, 100617ba13bSMingming Cao &ext4_xattr_trusted_handler, 10103010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 10264e178a7SChristoph Hellwig &posix_acl_access_xattr_handler, 10364e178a7SChristoph Hellwig &posix_acl_default_xattr_handler, 104ac27a0ecSDave Kleikamp #endif 10503010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 106617ba13bSMingming Cao &ext4_xattr_security_handler, 107ac27a0ecSDave Kleikamp #endif 108ac27a0ecSDave Kleikamp NULL 109ac27a0ecSDave Kleikamp }; 110ac27a0ecSDave Kleikamp 11147387409STahsin Erdogan #define EA_BLOCK_CACHE(inode) (((struct ext4_sb_info *) \ 11247387409STahsin Erdogan inode->i_sb->s_fs_info)->s_ea_block_cache) 1139c191f70ST Makphaibulchoke 114dec214d0STahsin Erdogan #define EA_INODE_CACHE(inode) (((struct ext4_sb_info *) \ 115dec214d0STahsin Erdogan inode->i_sb->s_fs_info)->s_ea_inode_cache) 116dec214d0STahsin Erdogan 11730a7eb97STahsin Erdogan static int 11830a7eb97STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 11930a7eb97STahsin Erdogan struct inode *inode); 12030a7eb97STahsin Erdogan 12133d201e0STahsin Erdogan #ifdef CONFIG_LOCKDEP 12233d201e0STahsin Erdogan void ext4_xattr_inode_set_class(struct inode *ea_inode) 12333d201e0STahsin Erdogan { 12433d201e0STahsin Erdogan lockdep_set_subclass(&ea_inode->i_rwsem, 1); 12533d201e0STahsin Erdogan } 12633d201e0STahsin Erdogan #endif 12733d201e0STahsin Erdogan 128cc8e94fdSDarrick J. Wong static __le32 ext4_xattr_block_csum(struct inode *inode, 129cc8e94fdSDarrick J. Wong sector_t block_nr, 130cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 131cc8e94fdSDarrick J. Wong { 132cc8e94fdSDarrick J. Wong struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 133d6a77105STheodore Ts'o __u32 csum; 134d6a77105STheodore Ts'o __le64 dsk_block_nr = cpu_to_le64(block_nr); 135b47820edSDaeho Jeong __u32 dummy_csum = 0; 136b47820edSDaeho Jeong int offset = offsetof(struct ext4_xattr_header, h_checksum); 137cc8e94fdSDarrick J. Wong 138d6a77105STheodore Ts'o csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, 139d6a77105STheodore Ts'o sizeof(dsk_block_nr)); 140b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); 141b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); 142b47820edSDaeho Jeong offset += sizeof(dummy_csum); 143b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, 144b47820edSDaeho Jeong EXT4_BLOCK_SIZE(inode->i_sb) - offset); 14541eb70ddSTao Ma 146cc8e94fdSDarrick J. Wong return cpu_to_le32(csum); 147cc8e94fdSDarrick J. Wong } 148cc8e94fdSDarrick J. Wong 149cc8e94fdSDarrick J. Wong static int ext4_xattr_block_csum_verify(struct inode *inode, 150dac7a4b4STheodore Ts'o struct buffer_head *bh) 151cc8e94fdSDarrick J. Wong { 152dac7a4b4STheodore Ts'o struct ext4_xattr_header *hdr = BHDR(bh); 153dac7a4b4STheodore Ts'o int ret = 1; 154dac7a4b4STheodore Ts'o 155dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) { 156dac7a4b4STheodore Ts'o lock_buffer(bh); 157dac7a4b4STheodore Ts'o ret = (hdr->h_checksum == ext4_xattr_block_csum(inode, 158dac7a4b4STheodore Ts'o bh->b_blocknr, hdr)); 159dac7a4b4STheodore Ts'o unlock_buffer(bh); 160dac7a4b4STheodore Ts'o } 161dac7a4b4STheodore Ts'o return ret; 162cc8e94fdSDarrick J. Wong } 163cc8e94fdSDarrick J. Wong 164cc8e94fdSDarrick J. Wong static void ext4_xattr_block_csum_set(struct inode *inode, 165cc8e94fdSDarrick J. Wong struct buffer_head *bh) 166cc8e94fdSDarrick J. Wong { 167dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) 168dac7a4b4STheodore Ts'o BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode, 169dac7a4b4STheodore Ts'o bh->b_blocknr, BHDR(bh)); 170cc8e94fdSDarrick J. Wong } 171cc8e94fdSDarrick J. Wong 17211e27528SStephen Hemminger static inline const struct xattr_handler * 173617ba13bSMingming Cao ext4_xattr_handler(int name_index) 174ac27a0ecSDave Kleikamp { 17511e27528SStephen Hemminger const struct xattr_handler *handler = NULL; 176ac27a0ecSDave Kleikamp 177617ba13bSMingming Cao if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) 178617ba13bSMingming Cao handler = ext4_xattr_handler_map[name_index]; 179ac27a0ecSDave Kleikamp return handler; 180ac27a0ecSDave Kleikamp } 181ac27a0ecSDave Kleikamp 182ac27a0ecSDave Kleikamp static int 1832c4f9923SEric Biggers ext4_xattr_check_entries(struct ext4_xattr_entry *entry, void *end, 184a0626e75SDarrick J. Wong void *value_start) 185ac27a0ecSDave Kleikamp { 186a0626e75SDarrick J. Wong struct ext4_xattr_entry *e = entry; 187a0626e75SDarrick J. Wong 188d7614cc1SEric Biggers /* Find the end of the names list */ 189a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(e)) { 190a0626e75SDarrick J. Wong struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); 191ac27a0ecSDave Kleikamp if ((void *)next >= end) 1926a797d27SDarrick J. Wong return -EFSCORRUPTED; 193a0626e75SDarrick J. Wong e = next; 194ac27a0ecSDave Kleikamp } 195a0626e75SDarrick J. Wong 196d7614cc1SEric Biggers /* Check the values */ 197a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(entry)) { 198d7614cc1SEric Biggers u32 size = le32_to_cpu(entry->e_value_size); 199*ce3fd194SEric Biggers 200*ce3fd194SEric Biggers if (size > INT_MAX) 201*ce3fd194SEric Biggers return -EFSCORRUPTED; 202*ce3fd194SEric Biggers 203*ce3fd194SEric Biggers if (size != 0 && entry->e_value_inum == 0) { 204*ce3fd194SEric Biggers u16 offs = le16_to_cpu(entry->e_value_offs); 205d7614cc1SEric Biggers void *value; 206d7614cc1SEric Biggers 207d7614cc1SEric Biggers /* 208d7614cc1SEric Biggers * The value cannot overlap the names, and the value 209d7614cc1SEric Biggers * with padding cannot extend beyond 'end'. Check both 210d7614cc1SEric Biggers * the padded and unpadded sizes, since the size may 211d7614cc1SEric Biggers * overflow to 0 when adding padding. 212d7614cc1SEric Biggers */ 213d7614cc1SEric Biggers if (offs > end - value_start) 2146a797d27SDarrick J. Wong return -EFSCORRUPTED; 215d7614cc1SEric Biggers value = value_start + offs; 216d7614cc1SEric Biggers if (value < (void *)e + sizeof(u32) || 217d7614cc1SEric Biggers size > end - value || 218d7614cc1SEric Biggers EXT4_XATTR_SIZE(size) > end - value) 219d7614cc1SEric Biggers return -EFSCORRUPTED; 220d7614cc1SEric Biggers } 221a0626e75SDarrick J. Wong entry = EXT4_XATTR_NEXT(entry); 222a0626e75SDarrick J. Wong } 223a0626e75SDarrick J. Wong 224ac27a0ecSDave Kleikamp return 0; 225ac27a0ecSDave Kleikamp } 226ac27a0ecSDave Kleikamp 227ac27a0ecSDave Kleikamp static inline int 228cc8e94fdSDarrick J. Wong ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) 229ac27a0ecSDave Kleikamp { 230cc8e94fdSDarrick J. Wong int error; 231cc8e94fdSDarrick J. Wong 232cc8e94fdSDarrick J. Wong if (buffer_verified(bh)) 233cc8e94fdSDarrick J. Wong return 0; 234cc8e94fdSDarrick J. Wong 235617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 236ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) 2376a797d27SDarrick J. Wong return -EFSCORRUPTED; 238dac7a4b4STheodore Ts'o if (!ext4_xattr_block_csum_verify(inode, bh)) 2396a797d27SDarrick J. Wong return -EFSBADCRC; 2402c4f9923SEric Biggers error = ext4_xattr_check_entries(BFIRST(bh), bh->b_data + bh->b_size, 241a0626e75SDarrick J. Wong bh->b_data); 242cc8e94fdSDarrick J. Wong if (!error) 243cc8e94fdSDarrick J. Wong set_buffer_verified(bh); 244cc8e94fdSDarrick J. Wong return error; 245ac27a0ecSDave Kleikamp } 246ac27a0ecSDave Kleikamp 2479e92f48cSTheodore Ts'o static int 2489e92f48cSTheodore Ts'o __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, 2499e92f48cSTheodore Ts'o void *end, const char *function, unsigned int line) 2509e92f48cSTheodore Ts'o { 2519e92f48cSTheodore Ts'o int error = -EFSCORRUPTED; 2529e92f48cSTheodore Ts'o 253290ab230SEric Biggers if (end - (void *)header < sizeof(*header) + sizeof(u32) || 25419962509SEric Biggers (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) 2559e92f48cSTheodore Ts'o goto errout; 2562c4f9923SEric Biggers error = ext4_xattr_check_entries(IFIRST(header), end, IFIRST(header)); 2579e92f48cSTheodore Ts'o errout: 2589e92f48cSTheodore Ts'o if (error) 2599e92f48cSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, 2609e92f48cSTheodore Ts'o "corrupted in-inode xattr"); 2619e92f48cSTheodore Ts'o return error; 2629e92f48cSTheodore Ts'o } 2639e92f48cSTheodore Ts'o 2649e92f48cSTheodore Ts'o #define xattr_check_inode(inode, header, end) \ 2659e92f48cSTheodore Ts'o __xattr_check_inode((inode), (header), (end), __func__, __LINE__) 2669e92f48cSTheodore Ts'o 267ac27a0ecSDave Kleikamp static int 268617ba13bSMingming Cao ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index, 2696ba644b9SEric Biggers const char *name, int sorted) 270ac27a0ecSDave Kleikamp { 271617ba13bSMingming Cao struct ext4_xattr_entry *entry; 272ac27a0ecSDave Kleikamp size_t name_len; 273ac27a0ecSDave Kleikamp int cmp = 1; 274ac27a0ecSDave Kleikamp 275ac27a0ecSDave Kleikamp if (name == NULL) 276ac27a0ecSDave Kleikamp return -EINVAL; 277ac27a0ecSDave Kleikamp name_len = strlen(name); 278ac27a0ecSDave Kleikamp entry = *pentry; 279617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 280ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 281ac27a0ecSDave Kleikamp if (!cmp) 282ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 283ac27a0ecSDave Kleikamp if (!cmp) 284ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 285ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 286ac27a0ecSDave Kleikamp break; 287ac27a0ecSDave Kleikamp } 288ac27a0ecSDave Kleikamp *pentry = entry; 289ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 290ac27a0ecSDave Kleikamp } 291ac27a0ecSDave Kleikamp 292dec214d0STahsin Erdogan static u32 293dec214d0STahsin Erdogan ext4_xattr_inode_hash(struct ext4_sb_info *sbi, const void *buffer, size_t size) 294dec214d0STahsin Erdogan { 295dec214d0STahsin Erdogan return ext4_chksum(sbi, sbi->s_csum_seed, buffer, size); 296dec214d0STahsin Erdogan } 297dec214d0STahsin Erdogan 298dec214d0STahsin Erdogan static u64 ext4_xattr_inode_get_ref(struct inode *ea_inode) 299dec214d0STahsin Erdogan { 300dec214d0STahsin Erdogan return ((u64)ea_inode->i_ctime.tv_sec << 32) | 301ee73f9a5SJeff Layton (u32) inode_peek_iversion_raw(ea_inode); 302dec214d0STahsin Erdogan } 303dec214d0STahsin Erdogan 304dec214d0STahsin Erdogan static void ext4_xattr_inode_set_ref(struct inode *ea_inode, u64 ref_count) 305dec214d0STahsin Erdogan { 306dec214d0STahsin Erdogan ea_inode->i_ctime.tv_sec = (u32)(ref_count >> 32); 307ee73f9a5SJeff Layton inode_set_iversion_raw(ea_inode, ref_count & 0xffffffff); 308dec214d0STahsin Erdogan } 309dec214d0STahsin Erdogan 310dec214d0STahsin Erdogan static u32 ext4_xattr_inode_get_hash(struct inode *ea_inode) 311dec214d0STahsin Erdogan { 312dec214d0STahsin Erdogan return (u32)ea_inode->i_atime.tv_sec; 313dec214d0STahsin Erdogan } 314dec214d0STahsin Erdogan 315dec214d0STahsin Erdogan static void ext4_xattr_inode_set_hash(struct inode *ea_inode, u32 hash) 316dec214d0STahsin Erdogan { 317dec214d0STahsin Erdogan ea_inode->i_atime.tv_sec = hash; 318dec214d0STahsin Erdogan } 319dec214d0STahsin Erdogan 320e50e5129SAndreas Dilger /* 321e50e5129SAndreas Dilger * Read the EA value from an inode. 322e50e5129SAndreas Dilger */ 32390966693STahsin Erdogan static int ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t size) 324e50e5129SAndreas Dilger { 3259699d4f9STahsin Erdogan int blocksize = 1 << ea_inode->i_blkbits; 3269699d4f9STahsin Erdogan int bh_count = (size + blocksize - 1) >> ea_inode->i_blkbits; 3279699d4f9STahsin Erdogan int tail_size = (size % blocksize) ?: blocksize; 3289699d4f9STahsin Erdogan struct buffer_head *bhs_inline[8]; 3299699d4f9STahsin Erdogan struct buffer_head **bhs = bhs_inline; 3309699d4f9STahsin Erdogan int i, ret; 331e50e5129SAndreas Dilger 3329699d4f9STahsin Erdogan if (bh_count > ARRAY_SIZE(bhs_inline)) { 3339699d4f9STahsin Erdogan bhs = kmalloc_array(bh_count, sizeof(*bhs), GFP_NOFS); 3349699d4f9STahsin Erdogan if (!bhs) 3359699d4f9STahsin Erdogan return -ENOMEM; 336e50e5129SAndreas Dilger } 3379699d4f9STahsin Erdogan 3389699d4f9STahsin Erdogan ret = ext4_bread_batch(ea_inode, 0 /* block */, bh_count, 3399699d4f9STahsin Erdogan true /* wait */, bhs); 3409699d4f9STahsin Erdogan if (ret) 3419699d4f9STahsin Erdogan goto free_bhs; 3429699d4f9STahsin Erdogan 3439699d4f9STahsin Erdogan for (i = 0; i < bh_count; i++) { 3449699d4f9STahsin Erdogan /* There shouldn't be any holes in ea_inode. */ 3459699d4f9STahsin Erdogan if (!bhs[i]) { 3469699d4f9STahsin Erdogan ret = -EFSCORRUPTED; 3479699d4f9STahsin Erdogan goto put_bhs; 3489699d4f9STahsin Erdogan } 3499699d4f9STahsin Erdogan memcpy((char *)buf + blocksize * i, bhs[i]->b_data, 3509699d4f9STahsin Erdogan i < bh_count - 1 ? blocksize : tail_size); 3519699d4f9STahsin Erdogan } 3529699d4f9STahsin Erdogan ret = 0; 3539699d4f9STahsin Erdogan put_bhs: 3549699d4f9STahsin Erdogan for (i = 0; i < bh_count; i++) 3559699d4f9STahsin Erdogan brelse(bhs[i]); 3569699d4f9STahsin Erdogan free_bhs: 3579699d4f9STahsin Erdogan if (bhs != bhs_inline) 3589699d4f9STahsin Erdogan kfree(bhs); 3599699d4f9STahsin Erdogan return ret; 360e50e5129SAndreas Dilger } 361e50e5129SAndreas Dilger 362a6d05676STahsin Erdogan #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec) 363a6d05676STahsin Erdogan 364bab79b04STahsin Erdogan static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, 365a6d05676STahsin Erdogan u32 ea_inode_hash, struct inode **ea_inode) 366e50e5129SAndreas Dilger { 367bab79b04STahsin Erdogan struct inode *inode; 368bab79b04STahsin Erdogan int err; 369e50e5129SAndreas Dilger 370bab79b04STahsin Erdogan inode = ext4_iget(parent->i_sb, ea_ino); 371bab79b04STahsin Erdogan if (IS_ERR(inode)) { 372bab79b04STahsin Erdogan err = PTR_ERR(inode); 373dec214d0STahsin Erdogan ext4_error(parent->i_sb, 374dec214d0STahsin Erdogan "error while reading EA inode %lu err=%d", ea_ino, 375dec214d0STahsin Erdogan err); 376bab79b04STahsin Erdogan return err; 377e50e5129SAndreas Dilger } 378e50e5129SAndreas Dilger 379bab79b04STahsin Erdogan if (is_bad_inode(inode)) { 380dec214d0STahsin Erdogan ext4_error(parent->i_sb, 381dec214d0STahsin Erdogan "error while reading EA inode %lu is_bad_inode", 382dec214d0STahsin Erdogan ea_ino); 383bab79b04STahsin Erdogan err = -EIO; 384e50e5129SAndreas Dilger goto error; 385e50e5129SAndreas Dilger } 386e50e5129SAndreas Dilger 387bab79b04STahsin Erdogan if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) { 388dec214d0STahsin Erdogan ext4_error(parent->i_sb, 389dec214d0STahsin Erdogan "EA inode %lu does not have EXT4_EA_INODE_FL flag", 390dec214d0STahsin Erdogan ea_ino); 391bab79b04STahsin Erdogan err = -EINVAL; 392e50e5129SAndreas Dilger goto error; 393e50e5129SAndreas Dilger } 394e50e5129SAndreas Dilger 395a6d05676STahsin Erdogan ext4_xattr_inode_set_class(inode); 396a6d05676STahsin Erdogan 397a6d05676STahsin Erdogan /* 398a6d05676STahsin Erdogan * Check whether this is an old Lustre-style xattr inode. Lustre 399a6d05676STahsin Erdogan * implementation does not have hash validation, rather it has a 400a6d05676STahsin Erdogan * backpointer from ea_inode to the parent inode. 401a6d05676STahsin Erdogan */ 402a6d05676STahsin Erdogan if (ea_inode_hash != ext4_xattr_inode_get_hash(inode) && 403a6d05676STahsin Erdogan EXT4_XATTR_INODE_GET_PARENT(inode) == parent->i_ino && 404a6d05676STahsin Erdogan inode->i_generation == parent->i_generation) { 405a6d05676STahsin Erdogan ext4_set_inode_state(inode, EXT4_STATE_LUSTRE_EA_INODE); 406a6d05676STahsin Erdogan ext4_xattr_inode_set_ref(inode, 1); 407a6d05676STahsin Erdogan } else { 408a6d05676STahsin Erdogan inode_lock(inode); 409a6d05676STahsin Erdogan inode->i_flags |= S_NOQUOTA; 410a6d05676STahsin Erdogan inode_unlock(inode); 411a6d05676STahsin Erdogan } 412a6d05676STahsin Erdogan 413bab79b04STahsin Erdogan *ea_inode = inode; 414bab79b04STahsin Erdogan return 0; 415e50e5129SAndreas Dilger error: 416bab79b04STahsin Erdogan iput(inode); 417bab79b04STahsin Erdogan return err; 418e50e5129SAndreas Dilger } 419e50e5129SAndreas Dilger 420dec214d0STahsin Erdogan static int 421b9fc761eSTahsin Erdogan ext4_xattr_inode_verify_hashes(struct inode *ea_inode, 422b9fc761eSTahsin Erdogan struct ext4_xattr_entry *entry, void *buffer, 423b9fc761eSTahsin Erdogan size_t size) 424dec214d0STahsin Erdogan { 425dec214d0STahsin Erdogan u32 hash; 426dec214d0STahsin Erdogan 427dec214d0STahsin Erdogan /* Verify stored hash matches calculated hash. */ 428dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); 429dec214d0STahsin Erdogan if (hash != ext4_xattr_inode_get_hash(ea_inode)) 430dec214d0STahsin Erdogan return -EFSCORRUPTED; 431b9fc761eSTahsin Erdogan 432b9fc761eSTahsin Erdogan if (entry) { 433b9fc761eSTahsin Erdogan __le32 e_hash, tmp_data; 434b9fc761eSTahsin Erdogan 435b9fc761eSTahsin Erdogan /* Verify entry hash. */ 436b9fc761eSTahsin Erdogan tmp_data = cpu_to_le32(hash); 437b9fc761eSTahsin Erdogan e_hash = ext4_xattr_hash_entry(entry->e_name, entry->e_name_len, 438b9fc761eSTahsin Erdogan &tmp_data, 1); 439b9fc761eSTahsin Erdogan if (e_hash != entry->e_hash) 440b9fc761eSTahsin Erdogan return -EFSCORRUPTED; 441b9fc761eSTahsin Erdogan } 442dec214d0STahsin Erdogan return 0; 443dec214d0STahsin Erdogan } 444dec214d0STahsin Erdogan 445e50e5129SAndreas Dilger /* 446b9fc761eSTahsin Erdogan * Read xattr value from the EA inode. 447e50e5129SAndreas Dilger */ 448e50e5129SAndreas Dilger static int 449b9fc761eSTahsin Erdogan ext4_xattr_inode_get(struct inode *inode, struct ext4_xattr_entry *entry, 450b9fc761eSTahsin Erdogan void *buffer, size_t size) 451e50e5129SAndreas Dilger { 452dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 453bab79b04STahsin Erdogan struct inode *ea_inode; 454dec214d0STahsin Erdogan int err; 455e50e5129SAndreas Dilger 456b9fc761eSTahsin Erdogan err = ext4_xattr_inode_iget(inode, le32_to_cpu(entry->e_value_inum), 457a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), &ea_inode); 458dec214d0STahsin Erdogan if (err) { 459dec214d0STahsin Erdogan ea_inode = NULL; 460dec214d0STahsin Erdogan goto out; 461dec214d0STahsin Erdogan } 462e50e5129SAndreas Dilger 463dec214d0STahsin Erdogan if (i_size_read(ea_inode) != size) { 464dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 465dec214d0STahsin Erdogan "ea_inode file size=%llu entry size=%zu", 466dec214d0STahsin Erdogan i_size_read(ea_inode), size); 467dec214d0STahsin Erdogan err = -EFSCORRUPTED; 468dec214d0STahsin Erdogan goto out; 469dec214d0STahsin Erdogan } 470dec214d0STahsin Erdogan 471dec214d0STahsin Erdogan err = ext4_xattr_inode_read(ea_inode, buffer, size); 472dec214d0STahsin Erdogan if (err) 473dec214d0STahsin Erdogan goto out; 474dec214d0STahsin Erdogan 475a6d05676STahsin Erdogan if (!ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) { 476a6d05676STahsin Erdogan err = ext4_xattr_inode_verify_hashes(ea_inode, entry, buffer, 477a6d05676STahsin Erdogan size); 478a6d05676STahsin Erdogan if (err) { 479dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 480dec214d0STahsin Erdogan "EA inode hash validation failed"); 481dec214d0STahsin Erdogan goto out; 482dec214d0STahsin Erdogan } 483dec214d0STahsin Erdogan 484dec214d0STahsin Erdogan if (ea_inode_cache) 485dec214d0STahsin Erdogan mb_cache_entry_create(ea_inode_cache, GFP_NOFS, 486dec214d0STahsin Erdogan ext4_xattr_inode_get_hash(ea_inode), 487dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 488a6d05676STahsin Erdogan } 489dec214d0STahsin Erdogan out: 490e50e5129SAndreas Dilger iput(ea_inode); 491dec214d0STahsin Erdogan return err; 492e50e5129SAndreas Dilger } 493e50e5129SAndreas Dilger 494ac27a0ecSDave Kleikamp static int 495617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 496ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 497ac27a0ecSDave Kleikamp { 498ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 499617ba13bSMingming Cao struct ext4_xattr_entry *entry; 500ac27a0ecSDave Kleikamp size_t size; 501ac27a0ecSDave Kleikamp int error; 50247387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 503ac27a0ecSDave Kleikamp 504ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 505ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 506ac27a0ecSDave Kleikamp 507ac27a0ecSDave Kleikamp error = -ENODATA; 508617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 509ac27a0ecSDave Kleikamp goto cleanup; 510ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 511ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 512617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 513ac27a0ecSDave Kleikamp if (!bh) 514ac27a0ecSDave Kleikamp goto cleanup; 515ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 516ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 517cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 51824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 519617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 5206a797d27SDarrick J. Wong error = -EFSCORRUPTED; 521ac27a0ecSDave Kleikamp goto cleanup; 522ac27a0ecSDave Kleikamp } 52347387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bh); 524ac27a0ecSDave Kleikamp entry = BFIRST(bh); 5256ba644b9SEric Biggers error = ext4_xattr_find_entry(&entry, name_index, name, 1); 526ac27a0ecSDave Kleikamp if (error) 527ac27a0ecSDave Kleikamp goto cleanup; 528ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 529ac27a0ecSDave Kleikamp if (buffer) { 530ac27a0ecSDave Kleikamp error = -ERANGE; 531ac27a0ecSDave Kleikamp if (size > buffer_size) 532ac27a0ecSDave Kleikamp goto cleanup; 533e50e5129SAndreas Dilger if (entry->e_value_inum) { 534b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 535b9fc761eSTahsin Erdogan size); 536e50e5129SAndreas Dilger if (error) 537e50e5129SAndreas Dilger goto cleanup; 538e50e5129SAndreas Dilger } else { 539e50e5129SAndreas Dilger memcpy(buffer, bh->b_data + 540e50e5129SAndreas Dilger le16_to_cpu(entry->e_value_offs), size); 541e50e5129SAndreas Dilger } 542ac27a0ecSDave Kleikamp } 543ac27a0ecSDave Kleikamp error = size; 544ac27a0ecSDave Kleikamp 545ac27a0ecSDave Kleikamp cleanup: 546ac27a0ecSDave Kleikamp brelse(bh); 547ac27a0ecSDave Kleikamp return error; 548ac27a0ecSDave Kleikamp } 549ac27a0ecSDave Kleikamp 550879b3825STao Ma int 551617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 552ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 553ac27a0ecSDave Kleikamp { 554617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 555617ba13bSMingming Cao struct ext4_xattr_entry *entry; 556617ba13bSMingming Cao struct ext4_inode *raw_inode; 557617ba13bSMingming Cao struct ext4_iloc iloc; 558ac27a0ecSDave Kleikamp size_t size; 559ac27a0ecSDave Kleikamp void *end; 560ac27a0ecSDave Kleikamp int error; 561ac27a0ecSDave Kleikamp 56219f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 563ac27a0ecSDave Kleikamp return -ENODATA; 564617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 565ac27a0ecSDave Kleikamp if (error) 566ac27a0ecSDave Kleikamp return error; 567617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 568ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 569617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 5709e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 571ac27a0ecSDave Kleikamp if (error) 572ac27a0ecSDave Kleikamp goto cleanup; 5736ba644b9SEric Biggers entry = IFIRST(header); 5746ba644b9SEric Biggers error = ext4_xattr_find_entry(&entry, name_index, name, 0); 575ac27a0ecSDave Kleikamp if (error) 576ac27a0ecSDave Kleikamp goto cleanup; 577ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 578ac27a0ecSDave Kleikamp if (buffer) { 579ac27a0ecSDave Kleikamp error = -ERANGE; 580ac27a0ecSDave Kleikamp if (size > buffer_size) 581ac27a0ecSDave Kleikamp goto cleanup; 582e50e5129SAndreas Dilger if (entry->e_value_inum) { 583b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 584b9fc761eSTahsin Erdogan size); 585e50e5129SAndreas Dilger if (error) 586e50e5129SAndreas Dilger goto cleanup; 587e50e5129SAndreas Dilger } else { 588ac27a0ecSDave Kleikamp memcpy(buffer, (void *)IFIRST(header) + 589ac27a0ecSDave Kleikamp le16_to_cpu(entry->e_value_offs), size); 590ac27a0ecSDave Kleikamp } 591e50e5129SAndreas Dilger } 592ac27a0ecSDave Kleikamp error = size; 593ac27a0ecSDave Kleikamp 594ac27a0ecSDave Kleikamp cleanup: 595ac27a0ecSDave Kleikamp brelse(iloc.bh); 596ac27a0ecSDave Kleikamp return error; 597ac27a0ecSDave Kleikamp } 598ac27a0ecSDave Kleikamp 599ac27a0ecSDave Kleikamp /* 600617ba13bSMingming Cao * ext4_xattr_get() 601ac27a0ecSDave Kleikamp * 602ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 603ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 604ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 605ac27a0ecSDave Kleikamp * 606ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 607ac27a0ecSDave Kleikamp * used / required on success. 608ac27a0ecSDave Kleikamp */ 609ac27a0ecSDave Kleikamp int 610617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 611ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 612ac27a0ecSDave Kleikamp { 613ac27a0ecSDave Kleikamp int error; 614ac27a0ecSDave Kleikamp 6150db1ff22STheodore Ts'o if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 6160db1ff22STheodore Ts'o return -EIO; 6170db1ff22STheodore Ts'o 618230b8c1aSZhang Zhen if (strlen(name) > 255) 619230b8c1aSZhang Zhen return -ERANGE; 620230b8c1aSZhang Zhen 621617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 622617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 623ac27a0ecSDave Kleikamp buffer_size); 624ac27a0ecSDave Kleikamp if (error == -ENODATA) 625617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 626ac27a0ecSDave Kleikamp buffer_size); 627617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 628ac27a0ecSDave Kleikamp return error; 629ac27a0ecSDave Kleikamp } 630ac27a0ecSDave Kleikamp 631ac27a0ecSDave Kleikamp static int 632431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 633ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 634ac27a0ecSDave Kleikamp { 635ac27a0ecSDave Kleikamp size_t rest = buffer_size; 636ac27a0ecSDave Kleikamp 637617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 63811e27528SStephen Hemminger const struct xattr_handler *handler = 639617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 640ac27a0ecSDave Kleikamp 641764a5c6bSAndreas Gruenbacher if (handler && (!handler->list || handler->list(dentry))) { 642764a5c6bSAndreas Gruenbacher const char *prefix = handler->prefix ?: handler->name; 643764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 644764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 645764a5c6bSAndreas Gruenbacher 646ac27a0ecSDave Kleikamp if (buffer) { 647ac27a0ecSDave Kleikamp if (size > rest) 648ac27a0ecSDave Kleikamp return -ERANGE; 649764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 650764a5c6bSAndreas Gruenbacher buffer += prefix_len; 651764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 652764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 653764a5c6bSAndreas Gruenbacher *buffer++ = 0; 654ac27a0ecSDave Kleikamp } 655ac27a0ecSDave Kleikamp rest -= size; 656ac27a0ecSDave Kleikamp } 657ac27a0ecSDave Kleikamp } 658764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 659ac27a0ecSDave Kleikamp } 660ac27a0ecSDave Kleikamp 661ac27a0ecSDave Kleikamp static int 662431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 663ac27a0ecSDave Kleikamp { 6642b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 665ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 666ac27a0ecSDave Kleikamp int error; 667ac27a0ecSDave Kleikamp 668ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 669ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 670ac27a0ecSDave Kleikamp 671ac27a0ecSDave Kleikamp error = 0; 672617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 673ac27a0ecSDave Kleikamp goto cleanup; 674ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 675ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 676617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 677ac27a0ecSDave Kleikamp error = -EIO; 678ac27a0ecSDave Kleikamp if (!bh) 679ac27a0ecSDave Kleikamp goto cleanup; 680ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 681ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 682cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 68324676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 684617ba13bSMingming Cao EXT4_I(inode)->i_file_acl); 6856a797d27SDarrick J. Wong error = -EFSCORRUPTED; 686ac27a0ecSDave Kleikamp goto cleanup; 687ac27a0ecSDave Kleikamp } 68847387409STahsin Erdogan ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); 689431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); 690ac27a0ecSDave Kleikamp 691ac27a0ecSDave Kleikamp cleanup: 692ac27a0ecSDave Kleikamp brelse(bh); 693ac27a0ecSDave Kleikamp 694ac27a0ecSDave Kleikamp return error; 695ac27a0ecSDave Kleikamp } 696ac27a0ecSDave Kleikamp 697ac27a0ecSDave Kleikamp static int 698431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 699ac27a0ecSDave Kleikamp { 7002b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 701617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 702617ba13bSMingming Cao struct ext4_inode *raw_inode; 703617ba13bSMingming Cao struct ext4_iloc iloc; 704ac27a0ecSDave Kleikamp void *end; 705ac27a0ecSDave Kleikamp int error; 706ac27a0ecSDave Kleikamp 70719f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 708ac27a0ecSDave Kleikamp return 0; 709617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 710ac27a0ecSDave Kleikamp if (error) 711ac27a0ecSDave Kleikamp return error; 712617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 713ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 714617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 7159e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 716ac27a0ecSDave Kleikamp if (error) 717ac27a0ecSDave Kleikamp goto cleanup; 718431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 719ac27a0ecSDave Kleikamp buffer, buffer_size); 720ac27a0ecSDave Kleikamp 721ac27a0ecSDave Kleikamp cleanup: 722ac27a0ecSDave Kleikamp brelse(iloc.bh); 723ac27a0ecSDave Kleikamp return error; 724ac27a0ecSDave Kleikamp } 725ac27a0ecSDave Kleikamp 726ac27a0ecSDave Kleikamp /* 727ba7ea1d8SEric Biggers * Inode operation listxattr() 728ba7ea1d8SEric Biggers * 729ba7ea1d8SEric Biggers * d_inode(dentry)->i_rwsem: don't care 730ac27a0ecSDave Kleikamp * 731ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 732ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 733ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 734ac27a0ecSDave Kleikamp * 735ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 736ac27a0ecSDave Kleikamp * used / required on success. 737ac27a0ecSDave Kleikamp */ 738ba7ea1d8SEric Biggers ssize_t 739ba7ea1d8SEric Biggers ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) 740ac27a0ecSDave Kleikamp { 741eaeef867STheodore Ts'o int ret, ret2; 742ac27a0ecSDave Kleikamp 7432b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 744eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 745eaeef867STheodore Ts'o if (ret < 0) 746eaeef867STheodore Ts'o goto errout; 747ac27a0ecSDave Kleikamp if (buffer) { 748eaeef867STheodore Ts'o buffer += ret; 749eaeef867STheodore Ts'o buffer_size -= ret; 750ac27a0ecSDave Kleikamp } 751eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 752eaeef867STheodore Ts'o if (ret < 0) 753eaeef867STheodore Ts'o goto errout; 754eaeef867STheodore Ts'o ret += ret2; 755eaeef867STheodore Ts'o errout: 7562b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 757eaeef867STheodore Ts'o return ret; 758ac27a0ecSDave Kleikamp } 759ac27a0ecSDave Kleikamp 760ac27a0ecSDave Kleikamp /* 761617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 762ac27a0ecSDave Kleikamp * not set, set it. 763ac27a0ecSDave Kleikamp */ 764617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 765ac27a0ecSDave Kleikamp struct super_block *sb) 766ac27a0ecSDave Kleikamp { 767e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 768ac27a0ecSDave Kleikamp return; 769ac27a0ecSDave Kleikamp 7705d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 771617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 772e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 773a0375156STheodore Ts'o ext4_handle_dirty_super(handle, sb); 774ac27a0ecSDave Kleikamp } 775ac27a0ecSDave Kleikamp } 776ac27a0ecSDave Kleikamp 7777a9ca53aSTahsin Erdogan int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) 7787a9ca53aSTahsin Erdogan { 7797a9ca53aSTahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 7807a9ca53aSTahsin Erdogan struct buffer_head *bh = NULL; 7817a9ca53aSTahsin Erdogan struct ext4_inode *raw_inode; 7827a9ca53aSTahsin Erdogan struct ext4_xattr_ibody_header *header; 7837a9ca53aSTahsin Erdogan struct ext4_xattr_entry *entry; 7847a9ca53aSTahsin Erdogan qsize_t ea_inode_refs = 0; 7857a9ca53aSTahsin Erdogan void *end; 7867a9ca53aSTahsin Erdogan int ret; 7877a9ca53aSTahsin Erdogan 7887a9ca53aSTahsin Erdogan lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); 7897a9ca53aSTahsin Erdogan 7907a9ca53aSTahsin Erdogan if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 7917a9ca53aSTahsin Erdogan ret = ext4_get_inode_loc(inode, &iloc); 7927a9ca53aSTahsin Erdogan if (ret) 7937a9ca53aSTahsin Erdogan goto out; 7947a9ca53aSTahsin Erdogan raw_inode = ext4_raw_inode(&iloc); 7957a9ca53aSTahsin Erdogan header = IHDR(inode, raw_inode); 7967a9ca53aSTahsin Erdogan end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 7977a9ca53aSTahsin Erdogan ret = xattr_check_inode(inode, header, end); 7987a9ca53aSTahsin Erdogan if (ret) 7997a9ca53aSTahsin Erdogan goto out; 8007a9ca53aSTahsin Erdogan 8017a9ca53aSTahsin Erdogan for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); 8027a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 8037a9ca53aSTahsin Erdogan if (entry->e_value_inum) 8047a9ca53aSTahsin Erdogan ea_inode_refs++; 8057a9ca53aSTahsin Erdogan } 8067a9ca53aSTahsin Erdogan 8077a9ca53aSTahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 8087a9ca53aSTahsin Erdogan bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 8097a9ca53aSTahsin Erdogan if (!bh) { 8107a9ca53aSTahsin Erdogan ret = -EIO; 8117a9ca53aSTahsin Erdogan goto out; 8127a9ca53aSTahsin Erdogan } 8137a9ca53aSTahsin Erdogan 8147a9ca53aSTahsin Erdogan if (ext4_xattr_check_block(inode, bh)) { 8157a9ca53aSTahsin Erdogan ret = -EFSCORRUPTED; 8167a9ca53aSTahsin Erdogan goto out; 8177a9ca53aSTahsin Erdogan } 8187a9ca53aSTahsin Erdogan 8197a9ca53aSTahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 8207a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 8217a9ca53aSTahsin Erdogan if (entry->e_value_inum) 8227a9ca53aSTahsin Erdogan ea_inode_refs++; 8237a9ca53aSTahsin Erdogan } 8247a9ca53aSTahsin Erdogan *usage = ea_inode_refs + 1; 8257a9ca53aSTahsin Erdogan ret = 0; 8267a9ca53aSTahsin Erdogan out: 8277a9ca53aSTahsin Erdogan brelse(iloc.bh); 8287a9ca53aSTahsin Erdogan brelse(bh); 8297a9ca53aSTahsin Erdogan return ret; 8307a9ca53aSTahsin Erdogan } 8317a9ca53aSTahsin Erdogan 832dec214d0STahsin Erdogan static inline size_t round_up_cluster(struct inode *inode, size_t length) 833dec214d0STahsin Erdogan { 834dec214d0STahsin Erdogan struct super_block *sb = inode->i_sb; 835dec214d0STahsin Erdogan size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + 836dec214d0STahsin Erdogan inode->i_blkbits); 837dec214d0STahsin Erdogan size_t mask = ~(cluster_size - 1); 838dec214d0STahsin Erdogan 839dec214d0STahsin Erdogan return (length + cluster_size - 1) & mask; 840dec214d0STahsin Erdogan } 841dec214d0STahsin Erdogan 842dec214d0STahsin Erdogan static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) 843dec214d0STahsin Erdogan { 844dec214d0STahsin Erdogan int err; 845dec214d0STahsin Erdogan 846dec214d0STahsin Erdogan err = dquot_alloc_inode(inode); 847dec214d0STahsin Erdogan if (err) 848dec214d0STahsin Erdogan return err; 849dec214d0STahsin Erdogan err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); 850dec214d0STahsin Erdogan if (err) 851dec214d0STahsin Erdogan dquot_free_inode(inode); 852dec214d0STahsin Erdogan return err; 853dec214d0STahsin Erdogan } 854dec214d0STahsin Erdogan 855a6d05676STahsin Erdogan static void ext4_xattr_inode_free_quota(struct inode *parent, 856a6d05676STahsin Erdogan struct inode *ea_inode, 857a6d05676STahsin Erdogan size_t len) 858dec214d0STahsin Erdogan { 859a6d05676STahsin Erdogan if (ea_inode && 860a6d05676STahsin Erdogan ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) 861a6d05676STahsin Erdogan return; 862a6d05676STahsin Erdogan dquot_free_space_nodirty(parent, round_up_cluster(parent, len)); 863a6d05676STahsin Erdogan dquot_free_inode(parent); 864dec214d0STahsin Erdogan } 865dec214d0STahsin Erdogan 866af65207cSTahsin Erdogan int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode, 867af65207cSTahsin Erdogan struct buffer_head *block_bh, size_t value_len, 868af65207cSTahsin Erdogan bool is_create) 869dec214d0STahsin Erdogan { 870dec214d0STahsin Erdogan int credits; 871dec214d0STahsin Erdogan int blocks; 872dec214d0STahsin Erdogan 873dec214d0STahsin Erdogan /* 874dec214d0STahsin Erdogan * 1) Owner inode update 875dec214d0STahsin Erdogan * 2) Ref count update on old xattr block 876dec214d0STahsin Erdogan * 3) new xattr block 877dec214d0STahsin Erdogan * 4) block bitmap update for new xattr block 878dec214d0STahsin Erdogan * 5) group descriptor for new xattr block 879dec214d0STahsin Erdogan * 6) block bitmap update for old xattr block 880dec214d0STahsin Erdogan * 7) group descriptor for old block 881dec214d0STahsin Erdogan * 882dec214d0STahsin Erdogan * 6 & 7 can happen if we have two racing threads T_a and T_b 883dec214d0STahsin Erdogan * which are each trying to set an xattr on inodes I_a and I_b 884dec214d0STahsin Erdogan * which were both initially sharing an xattr block. 885dec214d0STahsin Erdogan */ 886dec214d0STahsin Erdogan credits = 7; 887dec214d0STahsin Erdogan 888dec214d0STahsin Erdogan /* Quota updates. */ 889dec214d0STahsin Erdogan credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); 890dec214d0STahsin Erdogan 891dec214d0STahsin Erdogan /* 892dec214d0STahsin Erdogan * In case of inline data, we may push out the data to a block, 893dec214d0STahsin Erdogan * so we need to reserve credits for this eventuality 894dec214d0STahsin Erdogan */ 895af65207cSTahsin Erdogan if (inode && ext4_has_inline_data(inode)) 896dec214d0STahsin Erdogan credits += ext4_writepage_trans_blocks(inode) + 1; 897dec214d0STahsin Erdogan 898dec214d0STahsin Erdogan /* We are done if ea_inode feature is not enabled. */ 899dec214d0STahsin Erdogan if (!ext4_has_feature_ea_inode(sb)) 900dec214d0STahsin Erdogan return credits; 901dec214d0STahsin Erdogan 902dec214d0STahsin Erdogan /* New ea_inode, inode map, block bitmap, group descriptor. */ 903dec214d0STahsin Erdogan credits += 4; 904dec214d0STahsin Erdogan 905dec214d0STahsin Erdogan /* Data blocks. */ 906dec214d0STahsin Erdogan blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 907dec214d0STahsin Erdogan 908dec214d0STahsin Erdogan /* Indirection block or one level of extent tree. */ 909dec214d0STahsin Erdogan blocks += 1; 910dec214d0STahsin Erdogan 911dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 912dec214d0STahsin Erdogan credits += blocks * 2; 913dec214d0STahsin Erdogan 914dec214d0STahsin Erdogan /* Blocks themselves. */ 915dec214d0STahsin Erdogan credits += blocks; 916dec214d0STahsin Erdogan 917af65207cSTahsin Erdogan if (!is_create) { 918dec214d0STahsin Erdogan /* Dereference ea_inode holding old xattr value. 919dec214d0STahsin Erdogan * Old ea_inode, inode map, block bitmap, group descriptor. 920dec214d0STahsin Erdogan */ 921dec214d0STahsin Erdogan credits += 4; 922dec214d0STahsin Erdogan 923dec214d0STahsin Erdogan /* Data blocks for old ea_inode. */ 924dec214d0STahsin Erdogan blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; 925dec214d0STahsin Erdogan 926af65207cSTahsin Erdogan /* Indirection block or one level of extent tree for old 927af65207cSTahsin Erdogan * ea_inode. 928af65207cSTahsin Erdogan */ 929dec214d0STahsin Erdogan blocks += 1; 930dec214d0STahsin Erdogan 931dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 932dec214d0STahsin Erdogan credits += blocks * 2; 933af65207cSTahsin Erdogan } 934dec214d0STahsin Erdogan 935dec214d0STahsin Erdogan /* We may need to clone the existing xattr block in which case we need 936dec214d0STahsin Erdogan * to increment ref counts for existing ea_inodes referenced by it. 937dec214d0STahsin Erdogan */ 938dec214d0STahsin Erdogan if (block_bh) { 939dec214d0STahsin Erdogan struct ext4_xattr_entry *entry = BFIRST(block_bh); 940dec214d0STahsin Erdogan 941dec214d0STahsin Erdogan for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) 942dec214d0STahsin Erdogan if (entry->e_value_inum) 943dec214d0STahsin Erdogan /* Ref count update on ea_inode. */ 944dec214d0STahsin Erdogan credits += 1; 945dec214d0STahsin Erdogan } 946dec214d0STahsin Erdogan return credits; 947dec214d0STahsin Erdogan } 948dec214d0STahsin Erdogan 94930a7eb97STahsin Erdogan static int ext4_xattr_ensure_credits(handle_t *handle, struct inode *inode, 95030a7eb97STahsin Erdogan int credits, struct buffer_head *bh, 95130a7eb97STahsin Erdogan bool dirty, bool block_csum) 95230a7eb97STahsin Erdogan { 95330a7eb97STahsin Erdogan int error; 95430a7eb97STahsin Erdogan 95530a7eb97STahsin Erdogan if (!ext4_handle_valid(handle)) 95630a7eb97STahsin Erdogan return 0; 95730a7eb97STahsin Erdogan 95830a7eb97STahsin Erdogan if (handle->h_buffer_credits >= credits) 95930a7eb97STahsin Erdogan return 0; 96030a7eb97STahsin Erdogan 96130a7eb97STahsin Erdogan error = ext4_journal_extend(handle, credits - handle->h_buffer_credits); 96230a7eb97STahsin Erdogan if (!error) 96330a7eb97STahsin Erdogan return 0; 96430a7eb97STahsin Erdogan if (error < 0) { 96530a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Extend journal (error %d)", error); 96630a7eb97STahsin Erdogan return error; 96730a7eb97STahsin Erdogan } 96830a7eb97STahsin Erdogan 96930a7eb97STahsin Erdogan if (bh && dirty) { 97030a7eb97STahsin Erdogan if (block_csum) 97130a7eb97STahsin Erdogan ext4_xattr_block_csum_set(inode, bh); 97230a7eb97STahsin Erdogan error = ext4_handle_dirty_metadata(handle, NULL, bh); 97330a7eb97STahsin Erdogan if (error) { 97430a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Handle metadata (error %d)", 97530a7eb97STahsin Erdogan error); 97630a7eb97STahsin Erdogan return error; 97730a7eb97STahsin Erdogan } 97830a7eb97STahsin Erdogan } 97930a7eb97STahsin Erdogan 98030a7eb97STahsin Erdogan error = ext4_journal_restart(handle, credits); 98130a7eb97STahsin Erdogan if (error) { 98230a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Restart journal (error %d)", error); 98330a7eb97STahsin Erdogan return error; 98430a7eb97STahsin Erdogan } 98530a7eb97STahsin Erdogan 98630a7eb97STahsin Erdogan if (bh) { 98730a7eb97STahsin Erdogan error = ext4_journal_get_write_access(handle, bh); 98830a7eb97STahsin Erdogan if (error) { 98930a7eb97STahsin Erdogan ext4_warning(inode->i_sb, 99030a7eb97STahsin Erdogan "Get write access failed (error %d)", 99130a7eb97STahsin Erdogan error); 99230a7eb97STahsin Erdogan return error; 99330a7eb97STahsin Erdogan } 99430a7eb97STahsin Erdogan } 99530a7eb97STahsin Erdogan return 0; 99630a7eb97STahsin Erdogan } 99730a7eb97STahsin Erdogan 998dec214d0STahsin Erdogan static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, 999dec214d0STahsin Erdogan int ref_change) 1000dec214d0STahsin Erdogan { 1001dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(ea_inode); 1002dec214d0STahsin Erdogan struct ext4_iloc iloc; 1003dec214d0STahsin Erdogan s64 ref_count; 1004dec214d0STahsin Erdogan u32 hash; 1005dec214d0STahsin Erdogan int ret; 1006dec214d0STahsin Erdogan 1007dec214d0STahsin Erdogan inode_lock(ea_inode); 1008dec214d0STahsin Erdogan 1009dec214d0STahsin Erdogan ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); 1010dec214d0STahsin Erdogan if (ret) { 1011dec214d0STahsin Erdogan iloc.bh = NULL; 1012dec214d0STahsin Erdogan goto out; 1013dec214d0STahsin Erdogan } 1014dec214d0STahsin Erdogan 1015dec214d0STahsin Erdogan ref_count = ext4_xattr_inode_get_ref(ea_inode); 1016dec214d0STahsin Erdogan ref_count += ref_change; 1017dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, ref_count); 1018dec214d0STahsin Erdogan 1019dec214d0STahsin Erdogan if (ref_change > 0) { 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 == 1) { 1024dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", 1025dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1026dec214d0STahsin Erdogan 1027dec214d0STahsin Erdogan set_nlink(ea_inode, 1); 1028dec214d0STahsin Erdogan ext4_orphan_del(handle, ea_inode); 1029dec214d0STahsin Erdogan 1030cdb7ee4cSTahsin Erdogan if (ea_inode_cache) { 1031dec214d0STahsin Erdogan hash = ext4_xattr_inode_get_hash(ea_inode); 1032cdb7ee4cSTahsin Erdogan mb_cache_entry_create(ea_inode_cache, 1033cdb7ee4cSTahsin Erdogan GFP_NOFS, hash, 1034dec214d0STahsin Erdogan ea_inode->i_ino, 1035dec214d0STahsin Erdogan true /* reusable */); 1036dec214d0STahsin Erdogan } 1037cdb7ee4cSTahsin Erdogan } 1038dec214d0STahsin Erdogan } else { 1039dec214d0STahsin Erdogan WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", 1040dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1041dec214d0STahsin Erdogan 1042dec214d0STahsin Erdogan if (ref_count == 0) { 1043dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink != 1, 1044dec214d0STahsin Erdogan "EA inode %lu i_nlink=%u", 1045dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1046dec214d0STahsin Erdogan 1047dec214d0STahsin Erdogan clear_nlink(ea_inode); 1048dec214d0STahsin Erdogan ext4_orphan_add(handle, ea_inode); 1049dec214d0STahsin Erdogan 1050cdb7ee4cSTahsin Erdogan if (ea_inode_cache) { 1051dec214d0STahsin Erdogan hash = ext4_xattr_inode_get_hash(ea_inode); 1052dec214d0STahsin Erdogan mb_cache_entry_delete(ea_inode_cache, hash, 1053dec214d0STahsin Erdogan ea_inode->i_ino); 1054dec214d0STahsin Erdogan } 1055dec214d0STahsin Erdogan } 1056cdb7ee4cSTahsin Erdogan } 1057dec214d0STahsin Erdogan 1058dec214d0STahsin Erdogan ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); 1059dec214d0STahsin Erdogan iloc.bh = NULL; 1060dec214d0STahsin Erdogan if (ret) 1061dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 1062dec214d0STahsin Erdogan "ext4_mark_iloc_dirty() failed ret=%d", ret); 1063dec214d0STahsin Erdogan out: 1064dec214d0STahsin Erdogan brelse(iloc.bh); 1065dec214d0STahsin Erdogan inode_unlock(ea_inode); 1066dec214d0STahsin Erdogan return ret; 1067dec214d0STahsin Erdogan } 1068dec214d0STahsin Erdogan 1069dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) 1070dec214d0STahsin Erdogan { 1071dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, 1); 1072dec214d0STahsin Erdogan } 1073dec214d0STahsin Erdogan 1074dec214d0STahsin Erdogan static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) 1075dec214d0STahsin Erdogan { 1076dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, -1); 1077dec214d0STahsin Erdogan } 1078dec214d0STahsin Erdogan 1079dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, 1080dec214d0STahsin Erdogan struct ext4_xattr_entry *first) 1081dec214d0STahsin Erdogan { 1082dec214d0STahsin Erdogan struct inode *ea_inode; 1083dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 1084dec214d0STahsin Erdogan struct ext4_xattr_entry *failed_entry; 1085dec214d0STahsin Erdogan unsigned int ea_ino; 1086dec214d0STahsin Erdogan int err, saved_err; 1087dec214d0STahsin Erdogan 1088dec214d0STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 1089dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1090dec214d0STahsin Erdogan if (!entry->e_value_inum) 1091dec214d0STahsin Erdogan continue; 1092dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1093a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1094a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1095a6d05676STahsin Erdogan &ea_inode); 1096dec214d0STahsin Erdogan if (err) 1097dec214d0STahsin Erdogan goto cleanup; 1098dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1099dec214d0STahsin Erdogan if (err) { 1100dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "inc ref error %d", err); 1101dec214d0STahsin Erdogan iput(ea_inode); 1102dec214d0STahsin Erdogan goto cleanup; 1103dec214d0STahsin Erdogan } 1104dec214d0STahsin Erdogan iput(ea_inode); 1105dec214d0STahsin Erdogan } 1106dec214d0STahsin Erdogan return 0; 1107dec214d0STahsin Erdogan 1108dec214d0STahsin Erdogan cleanup: 1109dec214d0STahsin Erdogan saved_err = err; 1110dec214d0STahsin Erdogan failed_entry = entry; 1111dec214d0STahsin Erdogan 1112dec214d0STahsin Erdogan for (entry = first; entry != failed_entry; 1113dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1114dec214d0STahsin Erdogan if (!entry->e_value_inum) 1115dec214d0STahsin Erdogan continue; 1116dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1117a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1118a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1119a6d05676STahsin Erdogan &ea_inode); 1120dec214d0STahsin Erdogan if (err) { 1121dec214d0STahsin Erdogan ext4_warning(parent->i_sb, 1122dec214d0STahsin Erdogan "cleanup ea_ino %u iget error %d", ea_ino, 1123dec214d0STahsin Erdogan err); 1124dec214d0STahsin Erdogan continue; 1125dec214d0STahsin Erdogan } 1126dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1127dec214d0STahsin Erdogan if (err) 1128dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "cleanup dec ref error %d", 1129dec214d0STahsin Erdogan err); 1130dec214d0STahsin Erdogan iput(ea_inode); 1131dec214d0STahsin Erdogan } 1132dec214d0STahsin Erdogan return saved_err; 1133dec214d0STahsin Erdogan } 1134dec214d0STahsin Erdogan 113530a7eb97STahsin Erdogan static void 1136dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, 113730a7eb97STahsin Erdogan struct buffer_head *bh, 113830a7eb97STahsin Erdogan struct ext4_xattr_entry *first, bool block_csum, 113930a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1140dec214d0STahsin Erdogan int extra_credits, bool skip_quota) 114130a7eb97STahsin Erdogan { 114230a7eb97STahsin Erdogan struct inode *ea_inode; 114330a7eb97STahsin Erdogan struct ext4_xattr_entry *entry; 114430a7eb97STahsin Erdogan bool dirty = false; 114530a7eb97STahsin Erdogan unsigned int ea_ino; 114630a7eb97STahsin Erdogan int err; 114730a7eb97STahsin Erdogan int credits; 114830a7eb97STahsin Erdogan 114930a7eb97STahsin Erdogan /* One credit for dec ref on ea_inode, one for orphan list addition, */ 115030a7eb97STahsin Erdogan credits = 2 + extra_credits; 115130a7eb97STahsin Erdogan 115230a7eb97STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 115330a7eb97STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 115430a7eb97STahsin Erdogan if (!entry->e_value_inum) 115530a7eb97STahsin Erdogan continue; 115630a7eb97STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1157a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1158a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1159a6d05676STahsin Erdogan &ea_inode); 116030a7eb97STahsin Erdogan if (err) 116130a7eb97STahsin Erdogan continue; 116230a7eb97STahsin Erdogan 116330a7eb97STahsin Erdogan err = ext4_expand_inode_array(ea_inode_array, ea_inode); 116430a7eb97STahsin Erdogan if (err) { 116530a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, 116630a7eb97STahsin Erdogan "Expand inode array err=%d", err); 116730a7eb97STahsin Erdogan iput(ea_inode); 116830a7eb97STahsin Erdogan continue; 116930a7eb97STahsin Erdogan } 117030a7eb97STahsin Erdogan 117130a7eb97STahsin Erdogan err = ext4_xattr_ensure_credits(handle, parent, credits, bh, 117230a7eb97STahsin Erdogan dirty, block_csum); 117330a7eb97STahsin Erdogan if (err) { 117430a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, "Ensure credits err=%d", 117530a7eb97STahsin Erdogan err); 117630a7eb97STahsin Erdogan continue; 117730a7eb97STahsin Erdogan } 117830a7eb97STahsin Erdogan 1179dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1180dec214d0STahsin Erdogan if (err) { 1181dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", 1182dec214d0STahsin Erdogan err); 1183dec214d0STahsin Erdogan continue; 1184dec214d0STahsin Erdogan } 1185dec214d0STahsin Erdogan 1186dec214d0STahsin Erdogan if (!skip_quota) 1187a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(parent, ea_inode, 1188dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 118930a7eb97STahsin Erdogan 119030a7eb97STahsin Erdogan /* 119130a7eb97STahsin Erdogan * Forget about ea_inode within the same transaction that 119230a7eb97STahsin Erdogan * decrements the ref count. This avoids duplicate decrements in 119330a7eb97STahsin Erdogan * case the rest of the work spills over to subsequent 119430a7eb97STahsin Erdogan * transactions. 119530a7eb97STahsin Erdogan */ 119630a7eb97STahsin Erdogan entry->e_value_inum = 0; 119730a7eb97STahsin Erdogan entry->e_value_size = 0; 119830a7eb97STahsin Erdogan 119930a7eb97STahsin Erdogan dirty = true; 120030a7eb97STahsin Erdogan } 120130a7eb97STahsin Erdogan 120230a7eb97STahsin Erdogan if (dirty) { 120330a7eb97STahsin Erdogan /* 120430a7eb97STahsin Erdogan * Note that we are deliberately skipping csum calculation for 120530a7eb97STahsin Erdogan * the final update because we do not expect any journal 120630a7eb97STahsin Erdogan * restarts until xattr block is freed. 120730a7eb97STahsin Erdogan */ 120830a7eb97STahsin Erdogan 120930a7eb97STahsin Erdogan err = ext4_handle_dirty_metadata(handle, NULL, bh); 121030a7eb97STahsin Erdogan if (err) 121130a7eb97STahsin Erdogan ext4_warning_inode(parent, 121230a7eb97STahsin Erdogan "handle dirty metadata err=%d", err); 121330a7eb97STahsin Erdogan } 121430a7eb97STahsin Erdogan } 121530a7eb97STahsin Erdogan 1216ac27a0ecSDave Kleikamp /* 1217ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 1218ec4cb1aaSJan Kara * otherwise free the block. 1219ac27a0ecSDave Kleikamp */ 1220ac27a0ecSDave Kleikamp static void 1221617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 1222dec214d0STahsin Erdogan struct buffer_head *bh, 1223dec214d0STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1224dec214d0STahsin Erdogan int extra_credits) 1225ac27a0ecSDave Kleikamp { 122647387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 12276048c64bSAndreas Gruenbacher u32 hash, ref; 12288a2bfdcbSMingming Cao int error = 0; 1229ac27a0ecSDave Kleikamp 12305d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 12318a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 12328a2bfdcbSMingming Cao if (error) 12338a2bfdcbSMingming Cao goto out; 12348a2bfdcbSMingming Cao 12358a2bfdcbSMingming Cao lock_buffer(bh); 12366048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 12376048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 12386048c64bSAndreas Gruenbacher if (ref == 1) { 1239ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 124082939d79SJan Kara /* 124182939d79SJan Kara * This must happen under buffer lock for 124282939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 124382939d79SJan Kara */ 1244cdb7ee4cSTahsin Erdogan if (ea_block_cache) 1245cdb7ee4cSTahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, 1246cdb7ee4cSTahsin Erdogan bh->b_blocknr); 1247ac27a0ecSDave Kleikamp get_bh(bh); 1248ec4cb1aaSJan Kara unlock_buffer(bh); 1249dec214d0STahsin Erdogan 1250dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) 1251dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, bh, 1252dec214d0STahsin Erdogan BFIRST(bh), 1253dec214d0STahsin Erdogan true /* block_csum */, 1254dec214d0STahsin Erdogan ea_inode_array, 1255dec214d0STahsin Erdogan extra_credits, 1256dec214d0STahsin Erdogan true /* skip_quota */); 1257e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 1258e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 1259e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 1260ac27a0ecSDave Kleikamp } else { 12616048c64bSAndreas Gruenbacher ref--; 12626048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 12636048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 12646048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 12656048c64bSAndreas Gruenbacher 1266cdb7ee4cSTahsin Erdogan if (ea_block_cache) { 126747387409STahsin Erdogan ce = mb_cache_entry_get(ea_block_cache, hash, 12686048c64bSAndreas Gruenbacher bh->b_blocknr); 12696048c64bSAndreas Gruenbacher if (ce) { 12706048c64bSAndreas Gruenbacher ce->e_reusable = 1; 127147387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 12726048c64bSAndreas Gruenbacher } 12736048c64bSAndreas Gruenbacher } 1274cdb7ee4cSTahsin Erdogan } 12756048c64bSAndreas Gruenbacher 1276dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bh); 1277ec4cb1aaSJan Kara /* 1278ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 1279ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 1280ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 1281ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 1282ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 1283dac7a4b4STheodore Ts'o * call ext4_handle_dirty_metadata() with locked buffer as 1284ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 1285ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 1286ec4cb1aaSJan Kara */ 1287ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 1288dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1289c1bb05a6SEric Sandeen unlock_buffer(bh); 1290ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 1291dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1292ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 12930390131bSFrank Mayhar ext4_handle_sync(handle); 12941231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 1295ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 1296ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 1297ac27a0ecSDave Kleikamp } 12988a2bfdcbSMingming Cao out: 12998a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 13008a2bfdcbSMingming Cao return; 1301ac27a0ecSDave Kleikamp } 1302ac27a0ecSDave Kleikamp 13036dd4ee7cSKalpak Shah /* 13046dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 13056dd4ee7cSKalpak Shah * bytes used by EA entries. 13066dd4ee7cSKalpak Shah */ 13076dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 13086dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 13096dd4ee7cSKalpak Shah { 13106dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1311e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 13126dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 13136dd4ee7cSKalpak Shah if (offs < *min_offs) 13146dd4ee7cSKalpak Shah *min_offs = offs; 13156dd4ee7cSKalpak Shah } 13167b1b2c1bSTheodore Ts'o if (total) 13177b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 13186dd4ee7cSKalpak Shah } 13196dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 13206dd4ee7cSKalpak Shah } 13216dd4ee7cSKalpak Shah 1322e50e5129SAndreas Dilger /* 1323e50e5129SAndreas Dilger * Write the value of the EA in an inode. 1324e50e5129SAndreas Dilger */ 1325e50e5129SAndreas Dilger static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, 1326e50e5129SAndreas Dilger const void *buf, int bufsize) 1327e50e5129SAndreas Dilger { 1328e50e5129SAndreas Dilger struct buffer_head *bh = NULL; 1329e50e5129SAndreas Dilger unsigned long block = 0; 1330dec214d0STahsin Erdogan int blocksize = ea_inode->i_sb->s_blocksize; 1331dec214d0STahsin Erdogan int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; 1332e50e5129SAndreas Dilger int csize, wsize = 0; 1333e50e5129SAndreas Dilger int ret = 0; 1334e50e5129SAndreas Dilger int retries = 0; 1335e50e5129SAndreas Dilger 1336e50e5129SAndreas Dilger retry: 1337e50e5129SAndreas Dilger while (ret >= 0 && ret < max_blocks) { 1338e50e5129SAndreas Dilger struct ext4_map_blocks map; 1339e50e5129SAndreas Dilger map.m_lblk = block += ret; 1340e50e5129SAndreas Dilger map.m_len = max_blocks -= ret; 1341e50e5129SAndreas Dilger 1342e50e5129SAndreas Dilger ret = ext4_map_blocks(handle, ea_inode, &map, 1343e50e5129SAndreas Dilger EXT4_GET_BLOCKS_CREATE); 1344e50e5129SAndreas Dilger if (ret <= 0) { 1345e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1346e50e5129SAndreas Dilger if (ret == -ENOSPC && 1347e50e5129SAndreas Dilger ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { 1348e50e5129SAndreas Dilger ret = 0; 1349e50e5129SAndreas Dilger goto retry; 1350e50e5129SAndreas Dilger } 1351e50e5129SAndreas Dilger break; 1352e50e5129SAndreas Dilger } 1353e50e5129SAndreas Dilger } 1354e50e5129SAndreas Dilger 1355e50e5129SAndreas Dilger if (ret < 0) 1356e50e5129SAndreas Dilger return ret; 1357e50e5129SAndreas Dilger 1358e50e5129SAndreas Dilger block = 0; 1359e50e5129SAndreas Dilger while (wsize < bufsize) { 1360e50e5129SAndreas Dilger if (bh != NULL) 1361e50e5129SAndreas Dilger brelse(bh); 1362e50e5129SAndreas Dilger csize = (bufsize - wsize) > blocksize ? blocksize : 1363e50e5129SAndreas Dilger bufsize - wsize; 1364e50e5129SAndreas Dilger bh = ext4_getblk(handle, ea_inode, block, 0); 1365e50e5129SAndreas Dilger if (IS_ERR(bh)) 1366e50e5129SAndreas Dilger return PTR_ERR(bh); 1367e50e5129SAndreas Dilger ret = ext4_journal_get_write_access(handle, bh); 1368e50e5129SAndreas Dilger if (ret) 1369e50e5129SAndreas Dilger goto out; 1370e50e5129SAndreas Dilger 1371e50e5129SAndreas Dilger memcpy(bh->b_data, buf, csize); 1372e50e5129SAndreas Dilger set_buffer_uptodate(bh); 1373e50e5129SAndreas Dilger ext4_handle_dirty_metadata(handle, ea_inode, bh); 1374e50e5129SAndreas Dilger 1375e50e5129SAndreas Dilger buf += csize; 1376e50e5129SAndreas Dilger wsize += csize; 1377e50e5129SAndreas Dilger block += 1; 1378e50e5129SAndreas Dilger } 1379e50e5129SAndreas Dilger 1380e50e5129SAndreas Dilger inode_lock(ea_inode); 1381e50e5129SAndreas Dilger i_size_write(ea_inode, wsize); 1382e50e5129SAndreas Dilger ext4_update_i_disksize(ea_inode, wsize); 1383e50e5129SAndreas Dilger inode_unlock(ea_inode); 1384e50e5129SAndreas Dilger 1385e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1386e50e5129SAndreas Dilger 1387e50e5129SAndreas Dilger out: 1388e50e5129SAndreas Dilger brelse(bh); 1389e50e5129SAndreas Dilger 1390e50e5129SAndreas Dilger return ret; 1391e50e5129SAndreas Dilger } 1392e50e5129SAndreas Dilger 1393e50e5129SAndreas Dilger /* 1394e50e5129SAndreas Dilger * Create an inode to store the value of a large EA. 1395e50e5129SAndreas Dilger */ 1396e50e5129SAndreas Dilger static struct inode *ext4_xattr_inode_create(handle_t *handle, 1397dec214d0STahsin Erdogan struct inode *inode, u32 hash) 1398e50e5129SAndreas Dilger { 1399e50e5129SAndreas Dilger struct inode *ea_inode = NULL; 14009e1ba001STahsin Erdogan uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; 1401bd3b963bSTahsin Erdogan int err; 1402e50e5129SAndreas Dilger 1403e50e5129SAndreas Dilger /* 1404e50e5129SAndreas Dilger * Let the next inode be the goal, so we try and allocate the EA inode 1405e50e5129SAndreas Dilger * in the same group, or nearby one. 1406e50e5129SAndreas Dilger */ 1407e50e5129SAndreas Dilger ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, 14089e1ba001STahsin Erdogan S_IFREG | 0600, NULL, inode->i_ino + 1, owner, 14091b917ed8STahsin Erdogan EXT4_EA_INODE_FL); 1410e50e5129SAndreas Dilger if (!IS_ERR(ea_inode)) { 1411e50e5129SAndreas Dilger ea_inode->i_op = &ext4_file_inode_operations; 1412e50e5129SAndreas Dilger ea_inode->i_fop = &ext4_file_operations; 1413e50e5129SAndreas Dilger ext4_set_aops(ea_inode); 141433d201e0STahsin Erdogan ext4_xattr_inode_set_class(ea_inode); 1415e50e5129SAndreas Dilger unlock_new_inode(ea_inode); 1416dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, 1); 1417dec214d0STahsin Erdogan ext4_xattr_inode_set_hash(ea_inode, hash); 1418dec214d0STahsin Erdogan err = ext4_mark_inode_dirty(handle, ea_inode); 1419dec214d0STahsin Erdogan if (!err) 1420bd3b963bSTahsin Erdogan err = ext4_inode_attach_jinode(ea_inode); 1421bd3b963bSTahsin Erdogan if (err) { 1422bd3b963bSTahsin Erdogan iput(ea_inode); 1423bd3b963bSTahsin Erdogan return ERR_PTR(err); 1424bd3b963bSTahsin Erdogan } 1425dec214d0STahsin Erdogan 1426dec214d0STahsin Erdogan /* 1427dec214d0STahsin Erdogan * Xattr inodes are shared therefore quota charging is performed 1428dec214d0STahsin Erdogan * at a higher level. 1429dec214d0STahsin Erdogan */ 1430dec214d0STahsin Erdogan dquot_free_inode(ea_inode); 1431dec214d0STahsin Erdogan dquot_drop(ea_inode); 1432dec214d0STahsin Erdogan inode_lock(ea_inode); 1433dec214d0STahsin Erdogan ea_inode->i_flags |= S_NOQUOTA; 1434dec214d0STahsin Erdogan inode_unlock(ea_inode); 1435e50e5129SAndreas Dilger } 1436e50e5129SAndreas Dilger 1437e50e5129SAndreas Dilger return ea_inode; 1438e50e5129SAndreas Dilger } 1439e50e5129SAndreas Dilger 1440dec214d0STahsin Erdogan static struct inode * 1441dec214d0STahsin Erdogan ext4_xattr_inode_cache_find(struct inode *inode, const void *value, 1442dec214d0STahsin Erdogan size_t value_len, u32 hash) 1443e50e5129SAndreas Dilger { 1444dec214d0STahsin Erdogan struct inode *ea_inode; 1445dec214d0STahsin Erdogan struct mb_cache_entry *ce; 1446dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 1447dec214d0STahsin Erdogan void *ea_data; 1448e50e5129SAndreas Dilger 1449cdb7ee4cSTahsin Erdogan if (!ea_inode_cache) 1450cdb7ee4cSTahsin Erdogan return NULL; 1451cdb7ee4cSTahsin Erdogan 1452dec214d0STahsin Erdogan ce = mb_cache_entry_find_first(ea_inode_cache, hash); 1453dec214d0STahsin Erdogan if (!ce) 1454dec214d0STahsin Erdogan return NULL; 1455e50e5129SAndreas Dilger 1456dec214d0STahsin Erdogan ea_data = ext4_kvmalloc(value_len, GFP_NOFS); 1457dec214d0STahsin Erdogan if (!ea_data) { 1458dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1459dec214d0STahsin Erdogan return NULL; 1460dec214d0STahsin Erdogan } 1461dec214d0STahsin Erdogan 1462dec214d0STahsin Erdogan while (ce) { 1463dec214d0STahsin Erdogan ea_inode = ext4_iget(inode->i_sb, ce->e_value); 1464dec214d0STahsin Erdogan if (!IS_ERR(ea_inode) && 1465dec214d0STahsin Erdogan !is_bad_inode(ea_inode) && 1466dec214d0STahsin Erdogan (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && 1467dec214d0STahsin Erdogan i_size_read(ea_inode) == value_len && 1468dec214d0STahsin Erdogan !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && 1469b9fc761eSTahsin Erdogan !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, 1470dec214d0STahsin Erdogan value_len) && 1471dec214d0STahsin Erdogan !memcmp(value, ea_data, value_len)) { 1472dec214d0STahsin Erdogan mb_cache_entry_touch(ea_inode_cache, ce); 1473dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1474dec214d0STahsin Erdogan kvfree(ea_data); 1475dec214d0STahsin Erdogan return ea_inode; 1476dec214d0STahsin Erdogan } 1477dec214d0STahsin Erdogan 1478dec214d0STahsin Erdogan if (!IS_ERR(ea_inode)) 1479e50e5129SAndreas Dilger iput(ea_inode); 1480dec214d0STahsin Erdogan ce = mb_cache_entry_find_next(ea_inode_cache, ce); 1481dec214d0STahsin Erdogan } 1482dec214d0STahsin Erdogan kvfree(ea_data); 1483dec214d0STahsin Erdogan return NULL; 1484e50e5129SAndreas Dilger } 1485e50e5129SAndreas Dilger 1486e50e5129SAndreas Dilger /* 1487e50e5129SAndreas Dilger * Add value of the EA in an inode. 1488e50e5129SAndreas Dilger */ 1489dec214d0STahsin Erdogan static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, 1490dec214d0STahsin Erdogan const void *value, size_t value_len, 1491dec214d0STahsin Erdogan struct inode **ret_inode) 1492e50e5129SAndreas Dilger { 1493e50e5129SAndreas Dilger struct inode *ea_inode; 1494dec214d0STahsin Erdogan u32 hash; 1495e50e5129SAndreas Dilger int err; 1496e50e5129SAndreas Dilger 1497dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); 1498dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); 1499dec214d0STahsin Erdogan if (ea_inode) { 1500dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1501dec214d0STahsin Erdogan if (err) { 1502dec214d0STahsin Erdogan iput(ea_inode); 1503dec214d0STahsin Erdogan return err; 1504dec214d0STahsin Erdogan } 1505dec214d0STahsin Erdogan 1506dec214d0STahsin Erdogan *ret_inode = ea_inode; 1507dec214d0STahsin Erdogan return 0; 1508dec214d0STahsin Erdogan } 1509dec214d0STahsin Erdogan 1510e50e5129SAndreas Dilger /* Create an inode for the EA value */ 1511dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_create(handle, inode, hash); 1512e50e5129SAndreas Dilger if (IS_ERR(ea_inode)) 1513e50e5129SAndreas Dilger return PTR_ERR(ea_inode); 1514e50e5129SAndreas Dilger 1515e50e5129SAndreas Dilger err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); 1516dec214d0STahsin Erdogan if (err) { 1517dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref(handle, ea_inode); 1518e50e5129SAndreas Dilger iput(ea_inode); 1519e50e5129SAndreas Dilger return err; 1520e50e5129SAndreas Dilger } 1521e50e5129SAndreas Dilger 1522cdb7ee4cSTahsin Erdogan if (EA_INODE_CACHE(inode)) 1523dec214d0STahsin Erdogan mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, 1524dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 1525dec214d0STahsin Erdogan 1526dec214d0STahsin Erdogan *ret_inode = ea_inode; 1527dec214d0STahsin Erdogan return 0; 1528dec214d0STahsin Erdogan } 1529dec214d0STahsin Erdogan 15309c6e7853STahsin Erdogan /* 15319c6e7853STahsin Erdogan * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode 15329c6e7853STahsin Erdogan * feature is enabled. 15339c6e7853STahsin Erdogan */ 15349c6e7853STahsin Erdogan #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) 15359c6e7853STahsin Erdogan 1536e50e5129SAndreas Dilger static int ext4_xattr_set_entry(struct ext4_xattr_info *i, 1537e50e5129SAndreas Dilger struct ext4_xattr_search *s, 1538daf83281STahsin Erdogan handle_t *handle, struct inode *inode, 1539daf83281STahsin Erdogan bool is_block) 1540ac27a0ecSDave Kleikamp { 1541617ba13bSMingming Cao struct ext4_xattr_entry *last; 1542dec214d0STahsin Erdogan struct ext4_xattr_entry *here = s->here; 1543dec214d0STahsin Erdogan size_t min_offs = s->end - s->base, name_len = strlen(i->name); 1544e50e5129SAndreas Dilger int in_inode = i->in_inode; 1545dec214d0STahsin Erdogan struct inode *old_ea_inode = NULL; 1546dec214d0STahsin Erdogan struct inode *new_ea_inode = NULL; 1547dec214d0STahsin Erdogan size_t old_size, new_size; 1548dec214d0STahsin Erdogan int ret; 1549dec214d0STahsin Erdogan 1550dec214d0STahsin Erdogan /* Space used by old and new values. */ 1551dec214d0STahsin Erdogan old_size = (!s->not_found && !here->e_value_inum) ? 1552dec214d0STahsin Erdogan EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; 1553dec214d0STahsin Erdogan new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; 1554dec214d0STahsin Erdogan 1555dec214d0STahsin Erdogan /* 1556dec214d0STahsin Erdogan * Optimization for the simple case when old and new values have the 1557dec214d0STahsin Erdogan * same padded sizes. Not applicable if external inodes are involved. 1558dec214d0STahsin Erdogan */ 1559dec214d0STahsin Erdogan if (new_size && new_size == old_size) { 1560dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1561dec214d0STahsin Erdogan void *val = s->base + offs; 1562dec214d0STahsin Erdogan 1563dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1564dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1565dec214d0STahsin Erdogan memset(val, 0, new_size); 1566dec214d0STahsin Erdogan } else { 1567dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1568dec214d0STahsin Erdogan /* Clear padding bytes. */ 1569dec214d0STahsin Erdogan memset(val + i->value_len, 0, new_size - i->value_len); 1570dec214d0STahsin Erdogan } 157132aaf194STahsin Erdogan goto update_hash; 1572dec214d0STahsin Erdogan } 1573e50e5129SAndreas Dilger 1574ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 1575ac27a0ecSDave Kleikamp last = s->first; 1576617ba13bSMingming Cao for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1577e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 1578ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 1579ac27a0ecSDave Kleikamp if (offs < min_offs) 1580ac27a0ecSDave Kleikamp min_offs = offs; 1581ac27a0ecSDave Kleikamp } 1582ac27a0ecSDave Kleikamp } 1583dec214d0STahsin Erdogan 1584dec214d0STahsin Erdogan /* Check whether we have enough space. */ 1585ac27a0ecSDave Kleikamp if (i->value) { 1586dec214d0STahsin Erdogan size_t free; 1587e50e5129SAndreas Dilger 1588dec214d0STahsin Erdogan free = min_offs - ((void *)last - s->base) - sizeof(__u32); 1589dec214d0STahsin Erdogan if (!s->not_found) 1590dec214d0STahsin Erdogan free += EXT4_XATTR_LEN(name_len) + old_size; 1591e50e5129SAndreas Dilger 1592dec214d0STahsin Erdogan if (free < EXT4_XATTR_LEN(name_len) + new_size) { 1593dec214d0STahsin Erdogan ret = -ENOSPC; 1594dec214d0STahsin Erdogan goto out; 1595dec214d0STahsin Erdogan } 15969c6e7853STahsin Erdogan 15979c6e7853STahsin Erdogan /* 15989c6e7853STahsin Erdogan * If storing the value in an external inode is an option, 15999c6e7853STahsin Erdogan * reserve space for xattr entries/names in the external 16009c6e7853STahsin Erdogan * attribute block so that a long value does not occupy the 16019c6e7853STahsin Erdogan * whole space and prevent futher entries being added. 16029c6e7853STahsin Erdogan */ 1603daf83281STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 1604daf83281STahsin Erdogan new_size && is_block && 16059c6e7853STahsin Erdogan (min_offs + old_size - new_size) < 16069c6e7853STahsin Erdogan EXT4_XATTR_BLOCK_RESERVE(inode)) { 16079c6e7853STahsin Erdogan ret = -ENOSPC; 16089c6e7853STahsin Erdogan goto out; 16099c6e7853STahsin Erdogan } 1610ac27a0ecSDave Kleikamp } 1611ac27a0ecSDave Kleikamp 1612dec214d0STahsin Erdogan /* 1613dec214d0STahsin Erdogan * Getting access to old and new ea inodes is subject to failures. 1614dec214d0STahsin Erdogan * Finish that work before doing any modifications to the xattr data. 1615dec214d0STahsin Erdogan */ 1616dec214d0STahsin Erdogan if (!s->not_found && here->e_value_inum) { 1617dec214d0STahsin Erdogan ret = ext4_xattr_inode_iget(inode, 1618dec214d0STahsin Erdogan le32_to_cpu(here->e_value_inum), 1619a6d05676STahsin Erdogan le32_to_cpu(here->e_hash), 1620dec214d0STahsin Erdogan &old_ea_inode); 1621dec214d0STahsin Erdogan if (ret) { 1622dec214d0STahsin Erdogan old_ea_inode = NULL; 1623dec214d0STahsin Erdogan goto out; 1624bd9926e8STheodore Ts'o } 1625dec214d0STahsin Erdogan } 1626dec214d0STahsin Erdogan if (i->value && in_inode) { 1627dec214d0STahsin Erdogan WARN_ON_ONCE(!i->value_len); 1628dec214d0STahsin Erdogan 1629dec214d0STahsin Erdogan ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); 1630dec214d0STahsin Erdogan if (ret) 1631dec214d0STahsin Erdogan goto out; 1632dec214d0STahsin Erdogan 1633dec214d0STahsin Erdogan ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, 1634dec214d0STahsin Erdogan i->value_len, 1635dec214d0STahsin Erdogan &new_ea_inode); 1636dec214d0STahsin Erdogan if (ret) { 1637dec214d0STahsin Erdogan new_ea_inode = NULL; 1638a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, NULL, i->value_len); 1639dec214d0STahsin Erdogan goto out; 1640dec214d0STahsin Erdogan } 1641ac27a0ecSDave Kleikamp } 1642ac27a0ecSDave Kleikamp 1643dec214d0STahsin Erdogan if (old_ea_inode) { 1644dec214d0STahsin Erdogan /* We are ready to release ref count on the old_ea_inode. */ 1645dec214d0STahsin Erdogan ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); 1646dec214d0STahsin Erdogan if (ret) { 1647dec214d0STahsin Erdogan /* Release newly required ref count on new_ea_inode. */ 1648dec214d0STahsin Erdogan if (new_ea_inode) { 1649dec214d0STahsin Erdogan int err; 1650dec214d0STahsin Erdogan 1651dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, 1652dec214d0STahsin Erdogan new_ea_inode); 1653dec214d0STahsin Erdogan if (err) 1654dec214d0STahsin Erdogan ext4_warning_inode(new_ea_inode, 1655dec214d0STahsin Erdogan "dec ref new_ea_inode err=%d", 1656dec214d0STahsin Erdogan err); 1657a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, new_ea_inode, 1658dec214d0STahsin Erdogan i->value_len); 1659dec214d0STahsin Erdogan } 1660dec214d0STahsin Erdogan goto out; 1661dec214d0STahsin Erdogan } 1662dec214d0STahsin Erdogan 1663a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, old_ea_inode, 1664dec214d0STahsin Erdogan le32_to_cpu(here->e_value_size)); 1665dec214d0STahsin Erdogan } 1666dec214d0STahsin Erdogan 1667dec214d0STahsin Erdogan /* No failures allowed past this point. */ 1668dec214d0STahsin Erdogan 1669dec214d0STahsin Erdogan if (!s->not_found && here->e_value_offs) { 1670ac27a0ecSDave Kleikamp /* Remove the old value. */ 1671dec214d0STahsin Erdogan void *first_val = s->base + min_offs; 1672dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1673dec214d0STahsin Erdogan void *val = s->base + offs; 1674dec214d0STahsin Erdogan 1675dec214d0STahsin Erdogan memmove(first_val + old_size, first_val, val - first_val); 1676dec214d0STahsin Erdogan memset(first_val, 0, old_size); 1677dec214d0STahsin Erdogan min_offs += old_size; 1678ac27a0ecSDave Kleikamp 1679ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 1680ac27a0ecSDave Kleikamp last = s->first; 1681ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 1682ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 1683dec214d0STahsin Erdogan 1684e50e5129SAndreas Dilger if (!last->e_value_inum && 1685e50e5129SAndreas Dilger last->e_value_size && o < offs) 1686dec214d0STahsin Erdogan last->e_value_offs = cpu_to_le16(o + old_size); 1687617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 1688ac27a0ecSDave Kleikamp } 1689ac27a0ecSDave Kleikamp } 1690dec214d0STahsin Erdogan 1691ac27a0ecSDave Kleikamp if (!i->value) { 1692dec214d0STahsin Erdogan /* Remove old name. */ 1693617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 1694dec214d0STahsin Erdogan 1695ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 1696dec214d0STahsin Erdogan memmove(here, (void *)here + size, 1697dec214d0STahsin Erdogan (void *)last - (void *)here + sizeof(__u32)); 1698ac27a0ecSDave Kleikamp memset(last, 0, size); 1699dec214d0STahsin Erdogan } else if (s->not_found) { 1700dec214d0STahsin Erdogan /* Insert new name. */ 1701dec214d0STahsin Erdogan size_t size = EXT4_XATTR_LEN(name_len); 1702dec214d0STahsin Erdogan size_t rest = (void *)last - (void *)here + sizeof(__u32); 1703dec214d0STahsin Erdogan 1704dec214d0STahsin Erdogan memmove((void *)here + size, here, rest); 1705dec214d0STahsin Erdogan memset(here, 0, size); 1706dec214d0STahsin Erdogan here->e_name_index = i->name_index; 1707dec214d0STahsin Erdogan here->e_name_len = name_len; 1708dec214d0STahsin Erdogan memcpy(here->e_name, i->name, name_len); 1709dec214d0STahsin Erdogan } else { 1710dec214d0STahsin Erdogan /* This is an update, reset value info. */ 1711dec214d0STahsin Erdogan here->e_value_inum = 0; 1712dec214d0STahsin Erdogan here->e_value_offs = 0; 1713dec214d0STahsin Erdogan here->e_value_size = 0; 1714ac27a0ecSDave Kleikamp } 1715ac27a0ecSDave Kleikamp 1716ac27a0ecSDave Kleikamp if (i->value) { 1717dec214d0STahsin Erdogan /* Insert new value. */ 1718e50e5129SAndreas Dilger if (in_inode) { 1719dec214d0STahsin Erdogan here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); 1720e50e5129SAndreas Dilger } else if (i->value_len) { 1721dec214d0STahsin Erdogan void *val = s->base + min_offs - new_size; 1722e50e5129SAndreas Dilger 1723dec214d0STahsin Erdogan here->e_value_offs = cpu_to_le16(min_offs - new_size); 1724dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1725dec214d0STahsin Erdogan memset(val, 0, new_size); 1726dec214d0STahsin Erdogan } else { 1727dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1728dec214d0STahsin Erdogan /* Clear padding bytes. */ 1729dec214d0STahsin Erdogan memset(val + i->value_len, 0, 1730dec214d0STahsin Erdogan new_size - i->value_len); 1731dec214d0STahsin Erdogan } 1732dec214d0STahsin Erdogan } 1733dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1734dec214d0STahsin Erdogan } 1735daf83281STahsin Erdogan 173632aaf194STahsin Erdogan update_hash: 1737b9fc761eSTahsin Erdogan if (i->value) { 1738b9fc761eSTahsin Erdogan __le32 hash = 0; 1739b9fc761eSTahsin Erdogan 1740b9fc761eSTahsin Erdogan /* Entry hash calculation. */ 1741b9fc761eSTahsin Erdogan if (in_inode) { 1742b9fc761eSTahsin Erdogan __le32 crc32c_hash; 1743b9fc761eSTahsin Erdogan 1744b9fc761eSTahsin Erdogan /* 1745b9fc761eSTahsin Erdogan * Feed crc32c hash instead of the raw value for entry 1746b9fc761eSTahsin Erdogan * hash calculation. This is to avoid walking 1747b9fc761eSTahsin Erdogan * potentially long value buffer again. 1748b9fc761eSTahsin Erdogan */ 1749b9fc761eSTahsin Erdogan crc32c_hash = cpu_to_le32( 1750b9fc761eSTahsin Erdogan ext4_xattr_inode_get_hash(new_ea_inode)); 1751b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1752b9fc761eSTahsin Erdogan here->e_name_len, 1753b9fc761eSTahsin Erdogan &crc32c_hash, 1); 1754b9fc761eSTahsin Erdogan } else if (is_block) { 175532aaf194STahsin Erdogan __le32 *value = s->base + le16_to_cpu( 175632aaf194STahsin Erdogan here->e_value_offs); 1757b9fc761eSTahsin Erdogan 1758b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1759b9fc761eSTahsin Erdogan here->e_name_len, value, 1760b9fc761eSTahsin Erdogan new_size >> 2); 1761daf83281STahsin Erdogan } 1762b9fc761eSTahsin Erdogan here->e_hash = hash; 1763b9fc761eSTahsin Erdogan } 1764b9fc761eSTahsin Erdogan 1765b9fc761eSTahsin Erdogan if (is_block) 1766b9fc761eSTahsin Erdogan ext4_xattr_rehash((struct ext4_xattr_header *)s->base); 1767daf83281STahsin Erdogan 1768dec214d0STahsin Erdogan ret = 0; 1769e50e5129SAndreas Dilger out: 1770dec214d0STahsin Erdogan iput(old_ea_inode); 1771dec214d0STahsin Erdogan iput(new_ea_inode); 1772dec214d0STahsin Erdogan return ret; 1773ac27a0ecSDave Kleikamp } 1774ac27a0ecSDave Kleikamp 1775617ba13bSMingming Cao struct ext4_xattr_block_find { 1776617ba13bSMingming Cao struct ext4_xattr_search s; 1777ac27a0ecSDave Kleikamp struct buffer_head *bh; 1778ac27a0ecSDave Kleikamp }; 1779ac27a0ecSDave Kleikamp 1780ac27a0ecSDave Kleikamp static int 1781617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 1782617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1783ac27a0ecSDave Kleikamp { 1784ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1785ac27a0ecSDave Kleikamp int error; 1786ac27a0ecSDave Kleikamp 1787ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 1788ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 1789ac27a0ecSDave Kleikamp 1790617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 1791ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 1792617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 1793ac27a0ecSDave Kleikamp error = -EIO; 1794ac27a0ecSDave Kleikamp if (!bs->bh) 1795ac27a0ecSDave Kleikamp goto cleanup; 1796ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 1797ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 1798ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 1799cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bs->bh)) { 180024676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 180124676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 18026a797d27SDarrick J. Wong error = -EFSCORRUPTED; 1803ac27a0ecSDave Kleikamp goto cleanup; 1804ac27a0ecSDave Kleikamp } 1805ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1806ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 1807ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 1808ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 1809ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 1810617ba13bSMingming Cao error = ext4_xattr_find_entry(&bs->s.here, i->name_index, 18116ba644b9SEric Biggers i->name, 1); 1812ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1813ac27a0ecSDave Kleikamp goto cleanup; 1814ac27a0ecSDave Kleikamp bs->s.not_found = error; 1815ac27a0ecSDave Kleikamp } 1816ac27a0ecSDave Kleikamp error = 0; 1817ac27a0ecSDave Kleikamp 1818ac27a0ecSDave Kleikamp cleanup: 1819ac27a0ecSDave Kleikamp return error; 1820ac27a0ecSDave Kleikamp } 1821ac27a0ecSDave Kleikamp 1822ac27a0ecSDave Kleikamp static int 1823617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 1824617ba13bSMingming Cao struct ext4_xattr_info *i, 1825617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1826ac27a0ecSDave Kleikamp { 1827ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1828ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 1829b347e2bcSTahsin Erdogan struct ext4_xattr_search s_copy = bs->s; 1830b347e2bcSTahsin Erdogan struct ext4_xattr_search *s = &s_copy; 18317a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 18328a2bfdcbSMingming Cao int error = 0; 183347387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 1834a6d05676STahsin Erdogan struct inode *ea_inode = NULL, *tmp_inode; 1835a6d05676STahsin Erdogan size_t old_ea_inode_quota = 0; 1836a6d05676STahsin Erdogan unsigned int ea_ino; 1837a6d05676STahsin Erdogan 1838ac27a0ecSDave Kleikamp 1839617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 1840ac27a0ecSDave Kleikamp 1841ac27a0ecSDave Kleikamp if (s->base) { 18425d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 18438a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 18448a2bfdcbSMingming Cao if (error) 18458a2bfdcbSMingming Cao goto cleanup; 18468a2bfdcbSMingming Cao lock_buffer(bs->bh); 18478a2bfdcbSMingming Cao 1848ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 184982939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 185082939d79SJan Kara 185182939d79SJan Kara /* 185282939d79SJan Kara * This must happen under buffer lock for 185382939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 185482939d79SJan Kara * block 185582939d79SJan Kara */ 1856cdb7ee4cSTahsin Erdogan if (ea_block_cache) 185747387409STahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, 185882939d79SJan Kara bs->bh->b_blocknr); 1859ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 1860daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 1861daf83281STahsin Erdogan true /* is_block */); 1862dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bs->bh); 1863ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 18646a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1865ac27a0ecSDave Kleikamp goto bad_block; 1866ac27a0ecSDave Kleikamp if (!error) 1867dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 18680390131bSFrank Mayhar inode, 1869ac27a0ecSDave Kleikamp bs->bh); 1870ac27a0ecSDave Kleikamp if (error) 1871ac27a0ecSDave Kleikamp goto cleanup; 1872ac27a0ecSDave Kleikamp goto inserted; 1873ac27a0ecSDave Kleikamp } else { 1874ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 1875ac27a0ecSDave Kleikamp 18768a2bfdcbSMingming Cao unlock_buffer(bs->bh); 1877ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 1878216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 1879ac27a0ecSDave Kleikamp error = -ENOMEM; 1880ac27a0ecSDave Kleikamp if (s->base == NULL) 1881ac27a0ecSDave Kleikamp goto cleanup; 1882ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 1883ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1884ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1885ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 1886ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 1887dec214d0STahsin Erdogan 1888dec214d0STahsin Erdogan /* 1889dec214d0STahsin Erdogan * If existing entry points to an xattr inode, we need 1890dec214d0STahsin Erdogan * to prevent ext4_xattr_set_entry() from decrementing 1891dec214d0STahsin Erdogan * ref count on it because the reference belongs to the 1892dec214d0STahsin Erdogan * original block. In this case, make the entry look 1893dec214d0STahsin Erdogan * like it has an empty value. 1894dec214d0STahsin Erdogan */ 1895dec214d0STahsin Erdogan if (!s->not_found && s->here->e_value_inum) { 1896a6d05676STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 1897a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, 1898a6d05676STahsin Erdogan le32_to_cpu(s->here->e_hash), 1899a6d05676STahsin Erdogan &tmp_inode); 1900a6d05676STahsin Erdogan if (error) 1901a6d05676STahsin Erdogan goto cleanup; 1902a6d05676STahsin Erdogan 1903a6d05676STahsin Erdogan if (!ext4_test_inode_state(tmp_inode, 1904a6d05676STahsin Erdogan EXT4_STATE_LUSTRE_EA_INODE)) { 1905dec214d0STahsin Erdogan /* 1906a6d05676STahsin Erdogan * Defer quota free call for previous 1907a6d05676STahsin Erdogan * inode until success is guaranteed. 1908dec214d0STahsin Erdogan */ 1909a6d05676STahsin Erdogan old_ea_inode_quota = le32_to_cpu( 1910dec214d0STahsin Erdogan s->here->e_value_size); 1911a6d05676STahsin Erdogan } 1912a6d05676STahsin Erdogan iput(tmp_inode); 1913a6d05676STahsin Erdogan 1914dec214d0STahsin Erdogan s->here->e_value_inum = 0; 1915dec214d0STahsin Erdogan s->here->e_value_size = 0; 1916dec214d0STahsin Erdogan } 1917ac27a0ecSDave Kleikamp } 1918ac27a0ecSDave Kleikamp } else { 1919ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 1920216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 1921ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 1922ac27a0ecSDave Kleikamp error = -ENOMEM; 1923ac27a0ecSDave Kleikamp if (s->base == NULL) 1924ac27a0ecSDave Kleikamp goto cleanup; 1925617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 1926ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 1927ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1928ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1929ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 1930ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 1931ac27a0ecSDave Kleikamp } 1932ac27a0ecSDave Kleikamp 1933daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); 19346a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1935ac27a0ecSDave Kleikamp goto bad_block; 1936ac27a0ecSDave Kleikamp if (error) 1937ac27a0ecSDave Kleikamp goto cleanup; 1938dec214d0STahsin Erdogan 1939dec214d0STahsin Erdogan if (i->value && s->here->e_value_inum) { 1940dec214d0STahsin Erdogan /* 1941dec214d0STahsin Erdogan * A ref count on ea_inode has been taken as part of the call to 1942dec214d0STahsin Erdogan * ext4_xattr_set_entry() above. We would like to drop this 1943dec214d0STahsin Erdogan * extra ref but we have to wait until the xattr block is 1944dec214d0STahsin Erdogan * initialized and has its own ref count on the ea_inode. 1945dec214d0STahsin Erdogan */ 1946dec214d0STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 1947a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, 1948a6d05676STahsin Erdogan le32_to_cpu(s->here->e_hash), 1949a6d05676STahsin Erdogan &ea_inode); 1950dec214d0STahsin Erdogan if (error) { 1951dec214d0STahsin Erdogan ea_inode = NULL; 1952dec214d0STahsin Erdogan goto cleanup; 1953dec214d0STahsin Erdogan } 1954dec214d0STahsin Erdogan } 1955dec214d0STahsin Erdogan 1956ac27a0ecSDave Kleikamp inserted: 1957ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 195847387409STahsin Erdogan new_bh = ext4_xattr_block_cache_find(inode, header(s->base), 195947387409STahsin Erdogan &ce); 1960ac27a0ecSDave Kleikamp if (new_bh) { 1961ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 1962ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 1963ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 1964ac27a0ecSDave Kleikamp else { 19656048c64bSAndreas Gruenbacher u32 ref; 19666048c64bSAndreas Gruenbacher 1967b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 1968b8cb5a54STahsin Erdogan 1969ac27a0ecSDave Kleikamp /* The old block is released after updating 1970ac27a0ecSDave Kleikamp the inode. */ 19711231b3a1SLukas Czerner error = dquot_alloc_block(inode, 19721231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 19735dd4056dSChristoph Hellwig if (error) 1974ac27a0ecSDave Kleikamp goto cleanup; 19755d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 1976617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 1977ac27a0ecSDave Kleikamp new_bh); 1978ac27a0ecSDave Kleikamp if (error) 1979ac27a0ecSDave Kleikamp goto cleanup_dquot; 1980ac27a0ecSDave Kleikamp lock_buffer(new_bh); 198182939d79SJan Kara /* 198282939d79SJan Kara * We have to be careful about races with 19836048c64bSAndreas Gruenbacher * freeing, rehashing or adding references to 19846048c64bSAndreas Gruenbacher * xattr block. Once we hold buffer lock xattr 19856048c64bSAndreas Gruenbacher * block's state is stable so we can check 19866048c64bSAndreas Gruenbacher * whether the block got freed / rehashed or 19876048c64bSAndreas Gruenbacher * not. Since we unhash mbcache entry under 19886048c64bSAndreas Gruenbacher * buffer lock when freeing / rehashing xattr 19896048c64bSAndreas Gruenbacher * block, checking whether entry is still 19906048c64bSAndreas Gruenbacher * hashed is reliable. Same rules hold for 19916048c64bSAndreas Gruenbacher * e_reusable handling. 199282939d79SJan Kara */ 19936048c64bSAndreas Gruenbacher if (hlist_bl_unhashed(&ce->e_hash_list) || 19946048c64bSAndreas Gruenbacher !ce->e_reusable) { 199582939d79SJan Kara /* 199682939d79SJan Kara * Undo everything and check mbcache 199782939d79SJan Kara * again. 199882939d79SJan Kara */ 199982939d79SJan Kara unlock_buffer(new_bh); 200082939d79SJan Kara dquot_free_block(inode, 200182939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 200282939d79SJan Kara 1)); 200382939d79SJan Kara brelse(new_bh); 200447387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 200582939d79SJan Kara ce = NULL; 200682939d79SJan Kara new_bh = NULL; 200782939d79SJan Kara goto inserted; 200882939d79SJan Kara } 20096048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 20106048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 20116048c64bSAndreas Gruenbacher if (ref >= EXT4_XATTR_REFCOUNT_MAX) 20126048c64bSAndreas Gruenbacher ce->e_reusable = 0; 2013ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 20146048c64bSAndreas Gruenbacher ref); 2015dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2016ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2017dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 20180390131bSFrank Mayhar inode, 2019ac27a0ecSDave Kleikamp new_bh); 2020ac27a0ecSDave Kleikamp if (error) 2021ac27a0ecSDave Kleikamp goto cleanup_dquot; 2022ac27a0ecSDave Kleikamp } 202347387409STahsin Erdogan mb_cache_entry_touch(ea_block_cache, ce); 202447387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2025ac27a0ecSDave Kleikamp ce = NULL; 2026ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 2027ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 2028ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 2029ec000220STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); 2030ac27a0ecSDave Kleikamp new_bh = bs->bh; 2031ac27a0ecSDave Kleikamp get_bh(new_bh); 2032ac27a0ecSDave Kleikamp } else { 2033ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 2034fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 2035fb0a387dSEric Sandeen 2036b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 2037b8cb5a54STahsin Erdogan 2038fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 2039d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 2040fb0a387dSEric Sandeen 2041fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 204212e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 2043fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 2044fb0a387dSEric Sandeen 204555f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 204655f020dbSAllison Henderson NULL, &error); 2047ac27a0ecSDave Kleikamp if (error) 2048ac27a0ecSDave Kleikamp goto cleanup; 2049fb0a387dSEric Sandeen 205012e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 2051fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 2052fb0a387dSEric Sandeen 2053ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 2054ace36ad4SJoe Perches (unsigned long long)block); 2055ac27a0ecSDave Kleikamp 2056ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 2057aebf0243SWang Shilong if (unlikely(!new_bh)) { 2058860d21e2STheodore Ts'o error = -ENOMEM; 2059ac27a0ecSDave Kleikamp getblk_failed: 20607dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 2061e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 2062ac27a0ecSDave Kleikamp goto cleanup; 2063ac27a0ecSDave Kleikamp } 2064dec214d0STahsin Erdogan error = ext4_xattr_inode_inc_ref_all(handle, inode, 2065dec214d0STahsin Erdogan ENTRY(header(s->base)+1)); 2066dec214d0STahsin Erdogan if (error) 2067dec214d0STahsin Erdogan goto getblk_failed; 2068dec214d0STahsin Erdogan if (ea_inode) { 2069dec214d0STahsin Erdogan /* Drop the extra ref on ea_inode. */ 2070dec214d0STahsin Erdogan error = ext4_xattr_inode_dec_ref(handle, 2071dec214d0STahsin Erdogan ea_inode); 2072dec214d0STahsin Erdogan if (error) 2073dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 2074dec214d0STahsin Erdogan "dec ref error=%d", 2075dec214d0STahsin Erdogan error); 2076dec214d0STahsin Erdogan iput(ea_inode); 2077dec214d0STahsin Erdogan ea_inode = NULL; 2078dec214d0STahsin Erdogan } 2079dec214d0STahsin Erdogan 2080ac27a0ecSDave Kleikamp lock_buffer(new_bh); 2081617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 2082ac27a0ecSDave Kleikamp if (error) { 2083ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2084860d21e2STheodore Ts'o error = -EIO; 2085ac27a0ecSDave Kleikamp goto getblk_failed; 2086ac27a0ecSDave Kleikamp } 2087ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 2088dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2089ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 2090ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 209147387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, new_bh); 2092dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, 2093dac7a4b4STheodore Ts'o new_bh); 2094ac27a0ecSDave Kleikamp if (error) 2095ac27a0ecSDave Kleikamp goto cleanup; 2096ac27a0ecSDave Kleikamp } 2097ac27a0ecSDave Kleikamp } 2098ac27a0ecSDave Kleikamp 2099a6d05676STahsin Erdogan if (old_ea_inode_quota) 2100a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, NULL, old_ea_inode_quota); 2101dec214d0STahsin Erdogan 2102ac27a0ecSDave Kleikamp /* Update the inode. */ 2103617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 2104ac27a0ecSDave Kleikamp 2105ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 2106dec214d0STahsin Erdogan if (bs->bh && bs->bh != new_bh) { 2107dec214d0STahsin Erdogan struct ext4_xattr_inode_array *ea_inode_array = NULL; 2108dec214d0STahsin Erdogan 2109dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bs->bh, 2110dec214d0STahsin Erdogan &ea_inode_array, 2111dec214d0STahsin Erdogan 0 /* extra_credits */); 2112dec214d0STahsin Erdogan ext4_xattr_inode_array_free(ea_inode_array); 2113dec214d0STahsin Erdogan } 2114ac27a0ecSDave Kleikamp error = 0; 2115ac27a0ecSDave Kleikamp 2116ac27a0ecSDave Kleikamp cleanup: 2117dec214d0STahsin Erdogan if (ea_inode) { 2118dec214d0STahsin Erdogan int error2; 2119dec214d0STahsin Erdogan 2120dec214d0STahsin Erdogan error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); 2121dec214d0STahsin Erdogan if (error2) 2122dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "dec ref error=%d", 2123dec214d0STahsin Erdogan error2); 2124dec214d0STahsin Erdogan 2125dec214d0STahsin Erdogan /* If there was an error, revert the quota charge. */ 2126dec214d0STahsin Erdogan if (error) 2127a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, ea_inode, 2128dec214d0STahsin Erdogan i_size_read(ea_inode)); 2129dec214d0STahsin Erdogan iput(ea_inode); 2130dec214d0STahsin Erdogan } 2131ac27a0ecSDave Kleikamp if (ce) 213247387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2133ac27a0ecSDave Kleikamp brelse(new_bh); 2134ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 2135ac27a0ecSDave Kleikamp kfree(s->base); 2136ac27a0ecSDave Kleikamp 2137ac27a0ecSDave Kleikamp return error; 2138ac27a0ecSDave Kleikamp 2139ac27a0ecSDave Kleikamp cleanup_dquot: 21401231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 2141ac27a0ecSDave Kleikamp goto cleanup; 2142ac27a0ecSDave Kleikamp 2143ac27a0ecSDave Kleikamp bad_block: 214424676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 214524676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2146ac27a0ecSDave Kleikamp goto cleanup; 2147ac27a0ecSDave Kleikamp 2148ac27a0ecSDave Kleikamp #undef header 2149ac27a0ecSDave Kleikamp } 2150ac27a0ecSDave Kleikamp 2151879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 2152617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2153ac27a0ecSDave Kleikamp { 2154617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2155617ba13bSMingming Cao struct ext4_inode *raw_inode; 2156ac27a0ecSDave Kleikamp int error; 2157ac27a0ecSDave Kleikamp 2158617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 2159ac27a0ecSDave Kleikamp return 0; 2160617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 2161ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 2162ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 2163ac27a0ecSDave Kleikamp is->s.here = is->s.first; 2164617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 216519f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 21669e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 2167ac27a0ecSDave Kleikamp if (error) 2168ac27a0ecSDave Kleikamp return error; 2169ac27a0ecSDave Kleikamp /* Find the named attribute. */ 2170617ba13bSMingming Cao error = ext4_xattr_find_entry(&is->s.here, i->name_index, 21716ba644b9SEric Biggers i->name, 0); 2172ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 2173ac27a0ecSDave Kleikamp return error; 2174ac27a0ecSDave Kleikamp is->s.not_found = error; 2175ac27a0ecSDave Kleikamp } 2176ac27a0ecSDave Kleikamp return 0; 2177ac27a0ecSDave Kleikamp } 2178ac27a0ecSDave Kleikamp 21790d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 21800d812f77STao Ma struct ext4_xattr_info *i, 21810d812f77STao Ma struct ext4_xattr_ibody_find *is) 21820d812f77STao Ma { 21830d812f77STao Ma struct ext4_xattr_ibody_header *header; 21840d812f77STao Ma struct ext4_xattr_search *s = &is->s; 21850d812f77STao Ma int error; 21860d812f77STao Ma 21870d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 21880d812f77STao Ma return -ENOSPC; 2189daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 21900d812f77STao Ma if (error) { 21910d812f77STao Ma if (error == -ENOSPC && 21920d812f77STao Ma ext4_has_inline_data(inode)) { 21930d812f77STao Ma error = ext4_try_to_evict_inline_data(handle, inode, 21940d812f77STao Ma EXT4_XATTR_LEN(strlen(i->name) + 21950d812f77STao Ma EXT4_XATTR_SIZE(i->value_len))); 21960d812f77STao Ma if (error) 21970d812f77STao Ma return error; 21980d812f77STao Ma error = ext4_xattr_ibody_find(inode, i, is); 21990d812f77STao Ma if (error) 22000d812f77STao Ma return error; 2201daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 2202daf83281STahsin Erdogan false /* is_block */); 22030d812f77STao Ma } 22040d812f77STao Ma if (error) 22050d812f77STao Ma return error; 22060d812f77STao Ma } 22070d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 22080d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 22090d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 22100d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 22110d812f77STao Ma } else { 22120d812f77STao Ma header->h_magic = cpu_to_le32(0); 22130d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 22140d812f77STao Ma } 22150d812f77STao Ma return 0; 22160d812f77STao Ma } 22170d812f77STao Ma 2218e50e5129SAndreas Dilger static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 2219617ba13bSMingming Cao struct ext4_xattr_info *i, 2220617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2221ac27a0ecSDave Kleikamp { 2222617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2223617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 2224ac27a0ecSDave Kleikamp int error; 2225ac27a0ecSDave Kleikamp 2226617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 2227ac27a0ecSDave Kleikamp return -ENOSPC; 2228daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 2229ac27a0ecSDave Kleikamp if (error) 2230ac27a0ecSDave Kleikamp return error; 2231617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 2232ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 2233617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 223419f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 2235ac27a0ecSDave Kleikamp } else { 2236ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 223719f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 2238ac27a0ecSDave Kleikamp } 2239ac27a0ecSDave Kleikamp return 0; 2240ac27a0ecSDave Kleikamp } 2241ac27a0ecSDave Kleikamp 22423fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 22433fd16462SJan Kara struct ext4_xattr_info *i) 22443fd16462SJan Kara { 22453fd16462SJan Kara void *value; 22463fd16462SJan Kara 22470bd454c0STahsin Erdogan /* When e_value_inum is set the value is stored externally. */ 22480bd454c0STahsin Erdogan if (s->here->e_value_inum) 22490bd454c0STahsin Erdogan return 0; 22503fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 22513fd16462SJan Kara return 0; 22523fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 22533fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 22543fd16462SJan Kara } 22553fd16462SJan Kara 2256dec214d0STahsin Erdogan static struct buffer_head *ext4_xattr_get_block(struct inode *inode) 2257dec214d0STahsin Erdogan { 2258dec214d0STahsin Erdogan struct buffer_head *bh; 2259dec214d0STahsin Erdogan int error; 2260dec214d0STahsin Erdogan 2261dec214d0STahsin Erdogan if (!EXT4_I(inode)->i_file_acl) 2262dec214d0STahsin Erdogan return NULL; 2263dec214d0STahsin Erdogan bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 2264dec214d0STahsin Erdogan if (!bh) 2265dec214d0STahsin Erdogan return ERR_PTR(-EIO); 2266dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2267dec214d0STahsin Erdogan if (error) 2268dec214d0STahsin Erdogan return ERR_PTR(error); 2269dec214d0STahsin Erdogan return bh; 2270dec214d0STahsin Erdogan } 2271dec214d0STahsin Erdogan 2272ac27a0ecSDave Kleikamp /* 2273617ba13bSMingming Cao * ext4_xattr_set_handle() 2274ac27a0ecSDave Kleikamp * 22756e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 2276ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 2277ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 2278ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 2279ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 2280ac27a0ecSDave Kleikamp * previous to the call, respectively. 2281ac27a0ecSDave Kleikamp * 2282ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2283ac27a0ecSDave Kleikamp */ 2284ac27a0ecSDave Kleikamp int 2285617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 2286ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 2287ac27a0ecSDave Kleikamp int flags) 2288ac27a0ecSDave Kleikamp { 2289617ba13bSMingming Cao struct ext4_xattr_info i = { 2290ac27a0ecSDave Kleikamp .name_index = name_index, 2291ac27a0ecSDave Kleikamp .name = name, 2292ac27a0ecSDave Kleikamp .value = value, 2293ac27a0ecSDave Kleikamp .value_len = value_len, 2294e50e5129SAndreas Dilger .in_inode = 0, 2295ac27a0ecSDave Kleikamp }; 2296617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 2297ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2298ac27a0ecSDave Kleikamp }; 2299617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 2300ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2301ac27a0ecSDave Kleikamp }; 2302c755e251STheodore Ts'o int no_expand; 2303ac27a0ecSDave Kleikamp int error; 2304ac27a0ecSDave Kleikamp 2305ac27a0ecSDave Kleikamp if (!name) 2306ac27a0ecSDave Kleikamp return -EINVAL; 2307ac27a0ecSDave Kleikamp if (strlen(name) > 255) 2308ac27a0ecSDave Kleikamp return -ERANGE; 2309b8cb5a54STahsin Erdogan 2310c755e251STheodore Ts'o ext4_write_lock_xattr(inode, &no_expand); 23114d20c685SKalpak Shah 2312c1a5d5f6STahsin Erdogan /* Check journal credits under write lock. */ 2313c1a5d5f6STahsin Erdogan if (ext4_handle_valid(handle)) { 2314dec214d0STahsin Erdogan struct buffer_head *bh; 2315c1a5d5f6STahsin Erdogan int credits; 2316c1a5d5f6STahsin Erdogan 2317dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2318dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2319dec214d0STahsin Erdogan error = PTR_ERR(bh); 2320dec214d0STahsin Erdogan goto cleanup; 2321dec214d0STahsin Erdogan } 2322dec214d0STahsin Erdogan 2323af65207cSTahsin Erdogan credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2324af65207cSTahsin Erdogan value_len, 2325af65207cSTahsin Erdogan flags & XATTR_CREATE); 2326dec214d0STahsin Erdogan brelse(bh); 2327dec214d0STahsin Erdogan 2328c1a5d5f6STahsin Erdogan if (!ext4_handle_has_enough_credits(handle, credits)) { 2329c1a5d5f6STahsin Erdogan error = -ENOSPC; 2330c1a5d5f6STahsin Erdogan goto cleanup; 2331c1a5d5f6STahsin Erdogan } 2332c1a5d5f6STahsin Erdogan } 2333c1a5d5f6STahsin Erdogan 233466543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 233586ebfd08SEric Sandeen if (error) 233686ebfd08SEric Sandeen goto cleanup; 233786ebfd08SEric Sandeen 233819f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 2339617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 2340617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 234119f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 2342ac27a0ecSDave Kleikamp } 2343ac27a0ecSDave Kleikamp 2344617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 2345ac27a0ecSDave Kleikamp if (error) 2346ac27a0ecSDave Kleikamp goto cleanup; 2347ac27a0ecSDave Kleikamp if (is.s.not_found) 2348617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 2349ac27a0ecSDave Kleikamp if (error) 2350ac27a0ecSDave Kleikamp goto cleanup; 2351ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 2352ac27a0ecSDave Kleikamp error = -ENODATA; 2353ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 2354ac27a0ecSDave Kleikamp goto cleanup; 2355ac27a0ecSDave Kleikamp error = 0; 2356ac27a0ecSDave Kleikamp if (!value) 2357ac27a0ecSDave Kleikamp goto cleanup; 2358ac27a0ecSDave Kleikamp } else { 2359ac27a0ecSDave Kleikamp error = -EEXIST; 2360ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 2361ac27a0ecSDave Kleikamp goto cleanup; 2362ac27a0ecSDave Kleikamp } 2363dec214d0STahsin Erdogan 2364ac27a0ecSDave Kleikamp if (!value) { 2365ac27a0ecSDave Kleikamp if (!is.s.not_found) 2366e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2367ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 2368617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2369ac27a0ecSDave Kleikamp } else { 23703fd16462SJan Kara error = 0; 23713fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 23723fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 23733fd16462SJan Kara goto cleanup; 23743fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 23753fd16462SJan Kara goto cleanup; 23763fd16462SJan Kara 2377b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2378b347e2bcSTahsin Erdogan (EXT4_XATTR_SIZE(i.value_len) > 2379b347e2bcSTahsin Erdogan EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) 2380b347e2bcSTahsin Erdogan i.in_inode = 1; 2381b347e2bcSTahsin Erdogan retry_inode: 2382e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2383ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 2384ac27a0ecSDave Kleikamp i.value = NULL; 2385617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2386ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 23877e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 23887e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 23897e01c8e5STiger Yang if (error) 23907e01c8e5STiger Yang goto cleanup; 23917e01c8e5STiger Yang } 2392617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2393b347e2bcSTahsin Erdogan if (!error && !is.s.not_found) { 2394ac27a0ecSDave Kleikamp i.value = NULL; 2395e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, 2396e50e5129SAndreas Dilger &is); 2397b347e2bcSTahsin Erdogan } else if (error == -ENOSPC) { 2398b347e2bcSTahsin Erdogan /* 2399b347e2bcSTahsin Erdogan * Xattr does not fit in the block, store at 2400b347e2bcSTahsin Erdogan * external inode if possible. 2401b347e2bcSTahsin Erdogan */ 2402b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2403b347e2bcSTahsin Erdogan !i.in_inode) { 2404b347e2bcSTahsin Erdogan i.in_inode = 1; 2405b347e2bcSTahsin Erdogan goto retry_inode; 2406b347e2bcSTahsin Erdogan } 2407ac27a0ecSDave Kleikamp } 2408ac27a0ecSDave Kleikamp } 2409ac27a0ecSDave Kleikamp } 2410ac27a0ecSDave Kleikamp if (!error) { 2411617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 2412eeca7ea1SDeepa Dinamani inode->i_ctime = current_time(inode); 24136dd4ee7cSKalpak Shah if (!value) 2414c755e251STheodore Ts'o no_expand = 0; 2415617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 2416ac27a0ecSDave Kleikamp /* 2417617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 2418ac27a0ecSDave Kleikamp * error != 0. 2419ac27a0ecSDave Kleikamp */ 2420ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 2421ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 24220390131bSFrank Mayhar ext4_handle_sync(handle); 2423ac27a0ecSDave Kleikamp } 2424ac27a0ecSDave Kleikamp 2425ac27a0ecSDave Kleikamp cleanup: 2426ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 2427ac27a0ecSDave Kleikamp brelse(bs.bh); 2428c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 2429ac27a0ecSDave Kleikamp return error; 2430ac27a0ecSDave Kleikamp } 2431ac27a0ecSDave Kleikamp 2432af65207cSTahsin Erdogan int ext4_xattr_set_credits(struct inode *inode, size_t value_len, 2433af65207cSTahsin Erdogan bool is_create, int *credits) 2434c1a5d5f6STahsin Erdogan { 2435dec214d0STahsin Erdogan struct buffer_head *bh; 2436dec214d0STahsin Erdogan int err; 2437c1a5d5f6STahsin Erdogan 2438dec214d0STahsin Erdogan *credits = 0; 2439dec214d0STahsin Erdogan 2440dec214d0STahsin Erdogan if (!EXT4_SB(inode->i_sb)->s_journal) 2441c1a5d5f6STahsin Erdogan return 0; 2442c1a5d5f6STahsin Erdogan 2443dec214d0STahsin Erdogan down_read(&EXT4_I(inode)->xattr_sem); 2444c1a5d5f6STahsin Erdogan 2445dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2446dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2447dec214d0STahsin Erdogan err = PTR_ERR(bh); 2448dec214d0STahsin Erdogan } else { 2449af65207cSTahsin Erdogan *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2450af65207cSTahsin Erdogan value_len, is_create); 2451dec214d0STahsin Erdogan brelse(bh); 2452dec214d0STahsin Erdogan err = 0; 2453c1a5d5f6STahsin Erdogan } 2454dec214d0STahsin Erdogan 2455dec214d0STahsin Erdogan up_read(&EXT4_I(inode)->xattr_sem); 2456dec214d0STahsin Erdogan return err; 2457c1a5d5f6STahsin Erdogan } 2458c1a5d5f6STahsin Erdogan 2459ac27a0ecSDave Kleikamp /* 2460617ba13bSMingming Cao * ext4_xattr_set() 2461ac27a0ecSDave Kleikamp * 2462617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 2463ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 2464ac27a0ecSDave Kleikamp * 2465ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2466ac27a0ecSDave Kleikamp */ 2467ac27a0ecSDave Kleikamp int 2468617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 2469ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 2470ac27a0ecSDave Kleikamp { 2471ac27a0ecSDave Kleikamp handle_t *handle; 2472e50e5129SAndreas Dilger struct super_block *sb = inode->i_sb; 2473ac27a0ecSDave Kleikamp int error, retries = 0; 2474c1a5d5f6STahsin Erdogan int credits; 2475ac27a0ecSDave Kleikamp 2476b8cb5a54STahsin Erdogan error = dquot_initialize(inode); 2477b8cb5a54STahsin Erdogan if (error) 2478b8cb5a54STahsin Erdogan return error; 2479e50e5129SAndreas Dilger 2480ac27a0ecSDave Kleikamp retry: 2481af65207cSTahsin Erdogan error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, 2482af65207cSTahsin Erdogan &credits); 2483dec214d0STahsin Erdogan if (error) 2484dec214d0STahsin Erdogan return error; 2485dec214d0STahsin Erdogan 24869924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 2487ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 2488ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 2489ac27a0ecSDave Kleikamp } else { 2490ac27a0ecSDave Kleikamp int error2; 2491ac27a0ecSDave Kleikamp 2492617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 2493ac27a0ecSDave Kleikamp value, value_len, flags); 2494617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 2495ac27a0ecSDave Kleikamp if (error == -ENOSPC && 2496e50e5129SAndreas Dilger ext4_should_retry_alloc(sb, &retries)) 2497ac27a0ecSDave Kleikamp goto retry; 2498ac27a0ecSDave Kleikamp if (error == 0) 2499ac27a0ecSDave Kleikamp error = error2; 2500ac27a0ecSDave Kleikamp } 2501ac27a0ecSDave Kleikamp 2502ac27a0ecSDave Kleikamp return error; 2503ac27a0ecSDave Kleikamp } 2504ac27a0ecSDave Kleikamp 2505ac27a0ecSDave Kleikamp /* 25066dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 25076dd4ee7cSKalpak Shah * i_extra_isize. 25086dd4ee7cSKalpak Shah */ 25096dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 25106dd4ee7cSKalpak Shah int value_offs_shift, void *to, 251194405713SJan Kara void *from, size_t n) 25126dd4ee7cSKalpak Shah { 25136dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 25146dd4ee7cSKalpak Shah int new_offs; 25156dd4ee7cSKalpak Shah 251694405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 251794405713SJan Kara BUG_ON(value_offs_shift > 0); 251894405713SJan Kara 25196dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 25206dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 2521e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 25226dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 25236dd4ee7cSKalpak Shah value_offs_shift; 25246dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 25256dd4ee7cSKalpak Shah } 25266dd4ee7cSKalpak Shah } 25276dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 25286dd4ee7cSKalpak Shah memmove(to, from, n); 25296dd4ee7cSKalpak Shah } 25306dd4ee7cSKalpak Shah 25316dd4ee7cSKalpak Shah /* 25323f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 25333f2571c1SJan Kara */ 25343f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 25353f2571c1SJan Kara struct ext4_inode *raw_inode, 25363f2571c1SJan Kara struct ext4_xattr_entry *entry) 25373f2571c1SJan Kara { 25383f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 25393f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 25403f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 2541f6109100STahsin Erdogan size_t value_size = le32_to_cpu(entry->e_value_size); 25423f2571c1SJan Kara struct ext4_xattr_info i = { 25433f2571c1SJan Kara .value = NULL, 25443f2571c1SJan Kara .value_len = 0, 25453f2571c1SJan Kara .name_index = entry->e_name_index, 2546f6109100STahsin Erdogan .in_inode = !!entry->e_value_inum, 25473f2571c1SJan Kara }; 25483f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 25493f2571c1SJan Kara int error; 25503f2571c1SJan Kara 25513f2571c1SJan Kara is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 25523f2571c1SJan Kara bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 25533f2571c1SJan Kara buffer = kmalloc(value_size, GFP_NOFS); 25543f2571c1SJan Kara b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 25553f2571c1SJan Kara if (!is || !bs || !buffer || !b_entry_name) { 25563f2571c1SJan Kara error = -ENOMEM; 25573f2571c1SJan Kara goto out; 25583f2571c1SJan Kara } 25593f2571c1SJan Kara 25603f2571c1SJan Kara is->s.not_found = -ENODATA; 25613f2571c1SJan Kara bs->s.not_found = -ENODATA; 25623f2571c1SJan Kara is->iloc.bh = NULL; 25633f2571c1SJan Kara bs->bh = NULL; 25643f2571c1SJan Kara 25653f2571c1SJan Kara /* Save the entry name and the entry value */ 2566f6109100STahsin Erdogan if (entry->e_value_inum) { 2567b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, value_size); 2568f6109100STahsin Erdogan if (error) 2569f6109100STahsin Erdogan goto out; 2570f6109100STahsin Erdogan } else { 2571f6109100STahsin Erdogan size_t value_offs = le16_to_cpu(entry->e_value_offs); 25723f2571c1SJan Kara memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); 2573f6109100STahsin Erdogan } 2574f6109100STahsin Erdogan 25753f2571c1SJan Kara memcpy(b_entry_name, entry->e_name, entry->e_name_len); 25763f2571c1SJan Kara b_entry_name[entry->e_name_len] = '\0'; 25773f2571c1SJan Kara i.name = b_entry_name; 25783f2571c1SJan Kara 25793f2571c1SJan Kara error = ext4_get_inode_loc(inode, &is->iloc); 25803f2571c1SJan Kara if (error) 25813f2571c1SJan Kara goto out; 25823f2571c1SJan Kara 25833f2571c1SJan Kara error = ext4_xattr_ibody_find(inode, &i, is); 25843f2571c1SJan Kara if (error) 25853f2571c1SJan Kara goto out; 25863f2571c1SJan Kara 25873f2571c1SJan Kara /* Remove the chosen entry from the inode */ 2588e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, is); 25893f2571c1SJan Kara if (error) 25903f2571c1SJan Kara goto out; 25913f2571c1SJan Kara 25923f2571c1SJan Kara i.value = buffer; 25933f2571c1SJan Kara i.value_len = value_size; 25943f2571c1SJan Kara error = ext4_xattr_block_find(inode, &i, bs); 25953f2571c1SJan Kara if (error) 25963f2571c1SJan Kara goto out; 25973f2571c1SJan Kara 25983f2571c1SJan Kara /* Add entry which was removed from the inode into the block */ 25993f2571c1SJan Kara error = ext4_xattr_block_set(handle, inode, &i, bs); 26003f2571c1SJan Kara if (error) 26013f2571c1SJan Kara goto out; 26023f2571c1SJan Kara error = 0; 26033f2571c1SJan Kara out: 26043f2571c1SJan Kara kfree(b_entry_name); 26053f2571c1SJan Kara kfree(buffer); 26063f2571c1SJan Kara if (is) 26073f2571c1SJan Kara brelse(is->iloc.bh); 26083f2571c1SJan Kara kfree(is); 26093f2571c1SJan Kara kfree(bs); 26103f2571c1SJan Kara 26113f2571c1SJan Kara return error; 26123f2571c1SJan Kara } 26133f2571c1SJan Kara 2614dfa2064bSJan Kara static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, 2615dfa2064bSJan Kara struct ext4_inode *raw_inode, 2616dfa2064bSJan Kara int isize_diff, size_t ifree, 2617dfa2064bSJan Kara size_t bfree, int *total_ino) 2618dfa2064bSJan Kara { 2619dfa2064bSJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 2620dfa2064bSJan Kara struct ext4_xattr_entry *small_entry; 2621dfa2064bSJan Kara struct ext4_xattr_entry *entry; 2622dfa2064bSJan Kara struct ext4_xattr_entry *last; 2623dfa2064bSJan Kara unsigned int entry_size; /* EA entry size */ 2624dfa2064bSJan Kara unsigned int total_size; /* EA entry size + value size */ 2625dfa2064bSJan Kara unsigned int min_total_size; 2626dfa2064bSJan Kara int error; 2627dfa2064bSJan Kara 2628dfa2064bSJan Kara while (isize_diff > ifree) { 2629dfa2064bSJan Kara entry = NULL; 2630dfa2064bSJan Kara small_entry = NULL; 2631dfa2064bSJan Kara min_total_size = ~0U; 2632dfa2064bSJan Kara last = IFIRST(header); 2633dfa2064bSJan Kara /* Find the entry best suited to be pushed into EA block */ 2634dfa2064bSJan Kara for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 26359bb21cedSTahsin Erdogan total_size = EXT4_XATTR_LEN(last->e_name_len); 26369bb21cedSTahsin Erdogan if (!last->e_value_inum) 26379bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 26389bb21cedSTahsin Erdogan le32_to_cpu(last->e_value_size)); 2639dfa2064bSJan Kara if (total_size <= bfree && 2640dfa2064bSJan Kara total_size < min_total_size) { 2641dfa2064bSJan Kara if (total_size + ifree < isize_diff) { 2642dfa2064bSJan Kara small_entry = last; 2643dfa2064bSJan Kara } else { 2644dfa2064bSJan Kara entry = last; 2645dfa2064bSJan Kara min_total_size = total_size; 2646dfa2064bSJan Kara } 2647dfa2064bSJan Kara } 2648dfa2064bSJan Kara } 2649dfa2064bSJan Kara 2650dfa2064bSJan Kara if (entry == NULL) { 2651dfa2064bSJan Kara if (small_entry == NULL) 2652dfa2064bSJan Kara return -ENOSPC; 2653dfa2064bSJan Kara entry = small_entry; 2654dfa2064bSJan Kara } 2655dfa2064bSJan Kara 2656dfa2064bSJan Kara entry_size = EXT4_XATTR_LEN(entry->e_name_len); 26579bb21cedSTahsin Erdogan total_size = entry_size; 26589bb21cedSTahsin Erdogan if (!entry->e_value_inum) 26599bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 26609bb21cedSTahsin Erdogan le32_to_cpu(entry->e_value_size)); 2661dfa2064bSJan Kara error = ext4_xattr_move_to_block(handle, inode, raw_inode, 2662dfa2064bSJan Kara entry); 2663dfa2064bSJan Kara if (error) 2664dfa2064bSJan Kara return error; 2665dfa2064bSJan Kara 2666dfa2064bSJan Kara *total_ino -= entry_size; 2667dfa2064bSJan Kara ifree += total_size; 2668dfa2064bSJan Kara bfree -= total_size; 2669dfa2064bSJan Kara } 2670dfa2064bSJan Kara 2671dfa2064bSJan Kara return 0; 2672dfa2064bSJan Kara } 2673dfa2064bSJan Kara 26743f2571c1SJan Kara /* 26756dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 26766dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 26776dd4ee7cSKalpak Shah */ 26786dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 26796dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 26806dd4ee7cSKalpak Shah { 26816dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 2682b640b2c5SMiao Xie struct buffer_head *bh; 2683cf0a5e81SMiao Xie struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 2684cf0a5e81SMiao Xie static unsigned int mnt_count; 2685e3014d14SJan Kara size_t min_offs; 2686e3014d14SJan Kara size_t ifree, bfree; 26877b1b2c1bSTheodore Ts'o int total_ino; 26886e0cd088SJan Kara void *base, *end; 2689d0141191SJan Kara int error = 0, tried_min_extra_isize = 0; 2690cf0a5e81SMiao Xie int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); 2691d0141191SJan Kara int isize_diff; /* How much do we need to grow i_extra_isize */ 2692c755e251STheodore Ts'o 26936dd4ee7cSKalpak Shah retry: 2694d0141191SJan Kara isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; 26952e81a4eeSJan Kara if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) 2696b640b2c5SMiao Xie return 0; 26976dd4ee7cSKalpak Shah 26986dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 26996dd4ee7cSKalpak Shah 27006dd4ee7cSKalpak Shah /* 27016dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 27026dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 27036dd4ee7cSKalpak Shah */ 27046dd4ee7cSKalpak Shah 27056e0cd088SJan Kara base = IFIRST(header); 27066dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 27076dd4ee7cSKalpak Shah min_offs = end - base; 27086dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 27096dd4ee7cSKalpak Shah 27109e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 27119e92f48cSTheodore Ts'o if (error) 27129e92f48cSTheodore Ts'o goto cleanup; 27139e92f48cSTheodore Ts'o 27146e0cd088SJan Kara ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); 2715e3014d14SJan Kara if (ifree >= isize_diff) 2716e3014d14SJan Kara goto shift; 27176dd4ee7cSKalpak Shah 27186dd4ee7cSKalpak Shah /* 27196dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 27206dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 27216dd4ee7cSKalpak Shah */ 27226dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 27236dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 27246dd4ee7cSKalpak Shah error = -EIO; 27256dd4ee7cSKalpak Shah if (!bh) 27266dd4ee7cSKalpak Shah goto cleanup; 2727cc8e94fdSDarrick J. Wong if (ext4_xattr_check_block(inode, bh)) { 272824676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 272924676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 27306a797d27SDarrick J. Wong error = -EFSCORRUPTED; 2731b640b2c5SMiao Xie brelse(bh); 27326dd4ee7cSKalpak Shah goto cleanup; 27336dd4ee7cSKalpak Shah } 27346dd4ee7cSKalpak Shah base = BHDR(bh); 27356dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 27366dd4ee7cSKalpak Shah min_offs = end - base; 27376e0cd088SJan Kara bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, 27386e0cd088SJan Kara NULL); 2739b640b2c5SMiao Xie brelse(bh); 2740e3014d14SJan Kara if (bfree + ifree < isize_diff) { 27416dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 27426dd4ee7cSKalpak Shah tried_min_extra_isize++; 27436dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 27446dd4ee7cSKalpak Shah goto retry; 27456dd4ee7cSKalpak Shah } 2746dfa2064bSJan Kara error = -ENOSPC; 27476dd4ee7cSKalpak Shah goto cleanup; 27486dd4ee7cSKalpak Shah } 27496dd4ee7cSKalpak Shah } else { 2750e3014d14SJan Kara bfree = inode->i_sb->s_blocksize; 27516dd4ee7cSKalpak Shah } 27526dd4ee7cSKalpak Shah 2753dfa2064bSJan Kara error = ext4_xattr_make_inode_space(handle, inode, raw_inode, 2754dfa2064bSJan Kara isize_diff, ifree, bfree, 2755dfa2064bSJan Kara &total_ino); 2756dfa2064bSJan Kara if (error) { 2757dfa2064bSJan Kara if (error == -ENOSPC && !tried_min_extra_isize && 27586dd4ee7cSKalpak Shah s_min_extra_isize) { 27596dd4ee7cSKalpak Shah tried_min_extra_isize++; 27606dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 27616dd4ee7cSKalpak Shah goto retry; 27626dd4ee7cSKalpak Shah } 27636dd4ee7cSKalpak Shah goto cleanup; 27646dd4ee7cSKalpak Shah } 2765e3014d14SJan Kara shift: 2766e3014d14SJan Kara /* Adjust the offsets and shift the remaining entries ahead */ 27676e0cd088SJan Kara ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize 2768e3014d14SJan Kara - new_extra_isize, (void *)raw_inode + 2769e3014d14SJan Kara EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 277094405713SJan Kara (void *)header, total_ino); 2771e3014d14SJan Kara EXT4_I(inode)->i_extra_isize = new_extra_isize; 27726dd4ee7cSKalpak Shah 27736dd4ee7cSKalpak Shah cleanup: 2774b640b2c5SMiao Xie if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) { 2775cf0a5e81SMiao Xie ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", 2776cf0a5e81SMiao Xie inode->i_ino); 2777cf0a5e81SMiao Xie mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); 2778cf0a5e81SMiao Xie } 27796dd4ee7cSKalpak Shah return error; 27806dd4ee7cSKalpak Shah } 27816dd4ee7cSKalpak Shah 2782e50e5129SAndreas Dilger #define EIA_INCR 16 /* must be 2^n */ 2783e50e5129SAndreas Dilger #define EIA_MASK (EIA_INCR - 1) 2784dec214d0STahsin Erdogan 2785dec214d0STahsin Erdogan /* Add the large xattr @inode into @ea_inode_array for deferred iput(). 27860421a189STahsin Erdogan * If @ea_inode_array is new or full it will be grown and the old 2787e50e5129SAndreas Dilger * contents copied over. 2788e50e5129SAndreas Dilger */ 2789e50e5129SAndreas Dilger static int 27900421a189STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 27910421a189STahsin Erdogan struct inode *inode) 2792e50e5129SAndreas Dilger { 27930421a189STahsin Erdogan if (*ea_inode_array == NULL) { 2794e50e5129SAndreas Dilger /* 2795e50e5129SAndreas Dilger * Start with 15 inodes, so it fits into a power-of-two size. 27960421a189STahsin Erdogan * If *ea_inode_array is NULL, this is essentially offsetof() 2797e50e5129SAndreas Dilger */ 27980421a189STahsin Erdogan (*ea_inode_array) = 27990421a189STahsin Erdogan kmalloc(offsetof(struct ext4_xattr_inode_array, 28000421a189STahsin Erdogan inodes[EIA_MASK]), 2801e50e5129SAndreas Dilger GFP_NOFS); 28020421a189STahsin Erdogan if (*ea_inode_array == NULL) 2803e50e5129SAndreas Dilger return -ENOMEM; 28040421a189STahsin Erdogan (*ea_inode_array)->count = 0; 28050421a189STahsin Erdogan } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { 2806e50e5129SAndreas Dilger /* expand the array once all 15 + n * 16 slots are full */ 28070421a189STahsin Erdogan struct ext4_xattr_inode_array *new_array = NULL; 28080421a189STahsin Erdogan int count = (*ea_inode_array)->count; 2809e50e5129SAndreas Dilger 2810e50e5129SAndreas Dilger /* if new_array is NULL, this is essentially offsetof() */ 2811e50e5129SAndreas Dilger new_array = kmalloc( 28120421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, 28130421a189STahsin Erdogan inodes[count + EIA_INCR]), 2814e50e5129SAndreas Dilger GFP_NOFS); 2815e50e5129SAndreas Dilger if (new_array == NULL) 2816e50e5129SAndreas Dilger return -ENOMEM; 28170421a189STahsin Erdogan memcpy(new_array, *ea_inode_array, 28180421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, inodes[count])); 28190421a189STahsin Erdogan kfree(*ea_inode_array); 28200421a189STahsin Erdogan *ea_inode_array = new_array; 2821e50e5129SAndreas Dilger } 28220421a189STahsin Erdogan (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; 2823e50e5129SAndreas Dilger return 0; 2824e50e5129SAndreas Dilger } 2825e50e5129SAndreas Dilger 28266dd4ee7cSKalpak Shah /* 2827617ba13bSMingming Cao * ext4_xattr_delete_inode() 2828ac27a0ecSDave Kleikamp * 2829e50e5129SAndreas Dilger * Free extended attribute resources associated with this inode. Traverse 2830dec214d0STahsin Erdogan * all entries and decrement reference on any xattr inodes associated with this 2831dec214d0STahsin Erdogan * inode. This is called immediately before an inode is freed. We have exclusive 2832dec214d0STahsin Erdogan * access to the inode. If an orphan inode is deleted it will also release its 2833dec214d0STahsin Erdogan * references on xattr block and xattr inodes. 2834ac27a0ecSDave Kleikamp */ 2835dec214d0STahsin Erdogan int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, 283630a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 283730a7eb97STahsin Erdogan int extra_credits) 2838ac27a0ecSDave Kleikamp { 2839ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 2840e50e5129SAndreas Dilger struct ext4_xattr_ibody_header *header; 284130a7eb97STahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 2842dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 2843a6d05676STahsin Erdogan struct inode *ea_inode; 284430a7eb97STahsin Erdogan int error; 284530a7eb97STahsin Erdogan 284630a7eb97STahsin Erdogan error = ext4_xattr_ensure_credits(handle, inode, extra_credits, 284730a7eb97STahsin Erdogan NULL /* bh */, 284830a7eb97STahsin Erdogan false /* dirty */, 284930a7eb97STahsin Erdogan false /* block_csum */); 285030a7eb97STahsin Erdogan if (error) { 285130a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); 285230a7eb97STahsin Erdogan goto cleanup; 285330a7eb97STahsin Erdogan } 2854ac27a0ecSDave Kleikamp 2855dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2856dec214d0STahsin Erdogan ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 2857e50e5129SAndreas Dilger 2858e50e5129SAndreas Dilger error = ext4_get_inode_loc(inode, &iloc); 2859dec214d0STahsin Erdogan if (error) { 2860dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); 2861e50e5129SAndreas Dilger goto cleanup; 2862e50e5129SAndreas Dilger } 2863dec214d0STahsin Erdogan 2864dec214d0STahsin Erdogan error = ext4_journal_get_write_access(handle, iloc.bh); 2865dec214d0STahsin Erdogan if (error) { 2866dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "write access (error %d)", 2867dec214d0STahsin Erdogan error); 2868dec214d0STahsin Erdogan goto cleanup; 2869dec214d0STahsin Erdogan } 2870dec214d0STahsin Erdogan 2871dec214d0STahsin Erdogan header = IHDR(inode, ext4_raw_inode(&iloc)); 2872dec214d0STahsin Erdogan if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) 2873dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, 2874dec214d0STahsin Erdogan IFIRST(header), 2875dec214d0STahsin Erdogan false /* block_csum */, 2876dec214d0STahsin Erdogan ea_inode_array, 2877dec214d0STahsin Erdogan extra_credits, 2878dec214d0STahsin Erdogan false /* skip_quota */); 2879dec214d0STahsin Erdogan } 2880dec214d0STahsin Erdogan 2881dec214d0STahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 2882617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 2883ac27a0ecSDave Kleikamp if (!bh) { 288424676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 288524676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 288665d30005STahsin Erdogan error = -EIO; 2887ac27a0ecSDave Kleikamp goto cleanup; 2888ac27a0ecSDave Kleikamp } 2889dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2890dec214d0STahsin Erdogan if (error) { 2891dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "bad block %llu (error %d)", 2892dec214d0STahsin Erdogan EXT4_I(inode)->i_file_acl, error); 2893ac27a0ecSDave Kleikamp goto cleanup; 2894ac27a0ecSDave Kleikamp } 2895e50e5129SAndreas Dilger 289630a7eb97STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) { 2897dec214d0STahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 2898a6d05676STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 2899a6d05676STahsin Erdogan if (!entry->e_value_inum) 2900a6d05676STahsin Erdogan continue; 2901a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, 2902a6d05676STahsin Erdogan le32_to_cpu(entry->e_value_inum), 2903a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 2904a6d05676STahsin Erdogan &ea_inode); 2905a6d05676STahsin Erdogan if (error) 2906a6d05676STahsin Erdogan continue; 2907a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, ea_inode, 2908dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 2909a6d05676STahsin Erdogan iput(ea_inode); 2910a6d05676STahsin Erdogan } 2911dec214d0STahsin Erdogan 2912e50e5129SAndreas Dilger } 2913e50e5129SAndreas Dilger 2914dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bh, ea_inode_array, 2915dec214d0STahsin Erdogan extra_credits); 2916dec214d0STahsin Erdogan /* 2917dec214d0STahsin Erdogan * Update i_file_acl value in the same transaction that releases 2918dec214d0STahsin Erdogan * block. 2919dec214d0STahsin Erdogan */ 2920617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 292130a7eb97STahsin Erdogan error = ext4_mark_inode_dirty(handle, inode); 292230a7eb97STahsin Erdogan if (error) { 292330a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", 292430a7eb97STahsin Erdogan error); 292530a7eb97STahsin Erdogan goto cleanup; 292630a7eb97STahsin Erdogan } 2927dec214d0STahsin Erdogan } 2928dec214d0STahsin Erdogan error = 0; 2929ac27a0ecSDave Kleikamp cleanup: 293030a7eb97STahsin Erdogan brelse(iloc.bh); 2931ac27a0ecSDave Kleikamp brelse(bh); 2932e50e5129SAndreas Dilger return error; 2933e50e5129SAndreas Dilger } 2934e50e5129SAndreas Dilger 29350421a189STahsin Erdogan void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) 2936e50e5129SAndreas Dilger { 2937dec214d0STahsin Erdogan int idx; 2938e50e5129SAndreas Dilger 29390421a189STahsin Erdogan if (ea_inode_array == NULL) 2940e50e5129SAndreas Dilger return; 2941e50e5129SAndreas Dilger 2942dec214d0STahsin Erdogan for (idx = 0; idx < ea_inode_array->count; ++idx) 2943dec214d0STahsin Erdogan iput(ea_inode_array->inodes[idx]); 29440421a189STahsin Erdogan kfree(ea_inode_array); 2945ac27a0ecSDave Kleikamp } 2946ac27a0ecSDave Kleikamp 2947ac27a0ecSDave Kleikamp /* 294847387409STahsin Erdogan * ext4_xattr_block_cache_insert() 2949ac27a0ecSDave Kleikamp * 295047387409STahsin Erdogan * Create a new entry in the extended attribute block cache, and insert 2951ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 2952ac27a0ecSDave Kleikamp * 2953ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2954ac27a0ecSDave Kleikamp */ 2955ac27a0ecSDave Kleikamp static void 295647387409STahsin Erdogan ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, 295747387409STahsin Erdogan struct buffer_head *bh) 2958ac27a0ecSDave Kleikamp { 29596048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 29606048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 29616048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 29626048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 2963ac27a0ecSDave Kleikamp int error; 2964ac27a0ecSDave Kleikamp 2965cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 2966cdb7ee4cSTahsin Erdogan return; 296747387409STahsin Erdogan error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, 29686048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 2969ac27a0ecSDave Kleikamp if (error) { 297082939d79SJan Kara if (error == -EBUSY) 2971ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 297282939d79SJan Kara } else 2973ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 2974ac27a0ecSDave Kleikamp } 2975ac27a0ecSDave Kleikamp 2976ac27a0ecSDave Kleikamp /* 2977617ba13bSMingming Cao * ext4_xattr_cmp() 2978ac27a0ecSDave Kleikamp * 2979ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 2980ac27a0ecSDave Kleikamp * 2981ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 2982ac27a0ecSDave Kleikamp * a negative error number on errors. 2983ac27a0ecSDave Kleikamp */ 2984ac27a0ecSDave Kleikamp static int 2985617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 2986617ba13bSMingming Cao struct ext4_xattr_header *header2) 2987ac27a0ecSDave Kleikamp { 2988617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 2989ac27a0ecSDave Kleikamp 2990ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 2991ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 2992ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 2993ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 2994ac27a0ecSDave Kleikamp return 1; 2995ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 2996ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 2997ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 2998ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 2999e50e5129SAndreas Dilger entry1->e_value_inum != entry2->e_value_inum || 3000ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 3001ac27a0ecSDave Kleikamp return 1; 30027cec1918STahsin Erdogan if (!entry1->e_value_inum && 30037cec1918STahsin Erdogan memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 3004ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 3005ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 3006ac27a0ecSDave Kleikamp return 1; 3007ac27a0ecSDave Kleikamp 3008617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 3009617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 3010ac27a0ecSDave Kleikamp } 3011ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 3012ac27a0ecSDave Kleikamp return 1; 3013ac27a0ecSDave Kleikamp return 0; 3014ac27a0ecSDave Kleikamp } 3015ac27a0ecSDave Kleikamp 3016ac27a0ecSDave Kleikamp /* 301747387409STahsin Erdogan * ext4_xattr_block_cache_find() 3018ac27a0ecSDave Kleikamp * 3019ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 3020ac27a0ecSDave Kleikamp * 3021ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 3022ac27a0ecSDave Kleikamp * not found or an error occurred. 3023ac27a0ecSDave Kleikamp */ 3024ac27a0ecSDave Kleikamp static struct buffer_head * 302547387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *inode, 302647387409STahsin Erdogan struct ext4_xattr_header *header, 30277a2508e1SJan Kara struct mb_cache_entry **pce) 3028ac27a0ecSDave Kleikamp { 3029ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 30307a2508e1SJan Kara struct mb_cache_entry *ce; 303147387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 3032ac27a0ecSDave Kleikamp 3033cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 3034cdb7ee4cSTahsin Erdogan return NULL; 3035ac27a0ecSDave Kleikamp if (!header->h_hash) 3036ac27a0ecSDave Kleikamp return NULL; /* never share */ 3037ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 303847387409STahsin Erdogan ce = mb_cache_entry_find_first(ea_block_cache, hash); 3039ac27a0ecSDave Kleikamp while (ce) { 3040ac27a0ecSDave Kleikamp struct buffer_head *bh; 3041ac27a0ecSDave Kleikamp 3042c07dfcb4STahsin Erdogan bh = sb_bread(inode->i_sb, ce->e_value); 3043ac27a0ecSDave Kleikamp if (!bh) { 304424676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 3045c07dfcb4STahsin Erdogan (unsigned long)ce->e_value); 3046617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 3047ac27a0ecSDave Kleikamp *pce = ce; 3048ac27a0ecSDave Kleikamp return bh; 3049ac27a0ecSDave Kleikamp } 3050ac27a0ecSDave Kleikamp brelse(bh); 305147387409STahsin Erdogan ce = mb_cache_entry_find_next(ea_block_cache, ce); 3052ac27a0ecSDave Kleikamp } 3053ac27a0ecSDave Kleikamp return NULL; 3054ac27a0ecSDave Kleikamp } 3055ac27a0ecSDave Kleikamp 3056ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 3057ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 3058ac27a0ecSDave Kleikamp 3059ac27a0ecSDave Kleikamp /* 3060617ba13bSMingming Cao * ext4_xattr_hash_entry() 3061ac27a0ecSDave Kleikamp * 3062ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 3063ac27a0ecSDave Kleikamp */ 3064b9fc761eSTahsin Erdogan static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, 3065b9fc761eSTahsin Erdogan size_t value_count) 3066ac27a0ecSDave Kleikamp { 3067ac27a0ecSDave Kleikamp __u32 hash = 0; 3068ac27a0ecSDave Kleikamp 3069b9fc761eSTahsin Erdogan while (name_len--) { 3070ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 3071ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 3072ac27a0ecSDave Kleikamp *name++; 3073ac27a0ecSDave Kleikamp } 3074b9fc761eSTahsin Erdogan while (value_count--) { 3075ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 3076ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 3077ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 3078ac27a0ecSDave Kleikamp } 3079b9fc761eSTahsin Erdogan return cpu_to_le32(hash); 3080ac27a0ecSDave Kleikamp } 3081ac27a0ecSDave Kleikamp 3082ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 3083ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 3084ac27a0ecSDave Kleikamp 3085ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 3086ac27a0ecSDave Kleikamp 3087ac27a0ecSDave Kleikamp /* 3088617ba13bSMingming Cao * ext4_xattr_rehash() 3089ac27a0ecSDave Kleikamp * 3090ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 3091ac27a0ecSDave Kleikamp */ 3092daf83281STahsin Erdogan static void ext4_xattr_rehash(struct ext4_xattr_header *header) 3093ac27a0ecSDave Kleikamp { 3094617ba13bSMingming Cao struct ext4_xattr_entry *here; 3095ac27a0ecSDave Kleikamp __u32 hash = 0; 3096ac27a0ecSDave Kleikamp 3097ac27a0ecSDave Kleikamp here = ENTRY(header+1); 3098ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 3099ac27a0ecSDave Kleikamp if (!here->e_hash) { 3100ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 3101ac27a0ecSDave Kleikamp hash = 0; 3102ac27a0ecSDave Kleikamp break; 3103ac27a0ecSDave Kleikamp } 3104ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 3105ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 3106ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 3107617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 3108ac27a0ecSDave Kleikamp } 3109ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 3110ac27a0ecSDave Kleikamp } 3111ac27a0ecSDave Kleikamp 3112ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 3113ac27a0ecSDave Kleikamp 31149c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 31159c191f70ST Makphaibulchoke 31167a2508e1SJan Kara struct mb_cache * 311782939d79SJan Kara ext4_xattr_create_cache(void) 3118ac27a0ecSDave Kleikamp { 31197a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 3120ac27a0ecSDave Kleikamp } 3121ac27a0ecSDave Kleikamp 31227a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 3123ac27a0ecSDave Kleikamp { 31249c191f70ST Makphaibulchoke if (cache) 31257a2508e1SJan Kara mb_cache_destroy(cache); 3126ac27a0ecSDave Kleikamp } 31279c191f70ST Makphaibulchoke 3128