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); 199ce3fd194SEric Biggers 200*54dd0e0aSTheodore Ts'o if (size > EXT4_XATTR_SIZE_MAX) 201ce3fd194SEric Biggers return -EFSCORRUPTED; 202ce3fd194SEric Biggers 203ce3fd194SEric Biggers if (size != 0 && entry->e_value_inum == 0) { 204ce3fd194SEric 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 228de05ca85STheodore Ts'o __ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh, 229de05ca85STheodore Ts'o const char *function, unsigned int line) 230ac27a0ecSDave Kleikamp { 231de05ca85STheodore Ts'o int error = -EFSCORRUPTED; 232cc8e94fdSDarrick J. Wong 233cc8e94fdSDarrick J. Wong if (buffer_verified(bh)) 234cc8e94fdSDarrick J. Wong return 0; 235cc8e94fdSDarrick J. Wong 236617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 237ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) 238de05ca85STheodore Ts'o goto errout; 239de05ca85STheodore Ts'o error = -EFSBADCRC; 240dac7a4b4STheodore Ts'o if (!ext4_xattr_block_csum_verify(inode, bh)) 241de05ca85STheodore Ts'o goto errout; 2422c4f9923SEric Biggers error = ext4_xattr_check_entries(BFIRST(bh), bh->b_data + bh->b_size, 243a0626e75SDarrick J. Wong bh->b_data); 244de05ca85STheodore Ts'o errout: 245de05ca85STheodore Ts'o if (error) 246de05ca85STheodore Ts'o __ext4_error_inode(inode, function, line, 0, 247de05ca85STheodore Ts'o "corrupted xattr block %llu", 248de05ca85STheodore Ts'o (unsigned long long) bh->b_blocknr); 249de05ca85STheodore Ts'o else 250cc8e94fdSDarrick J. Wong set_buffer_verified(bh); 251cc8e94fdSDarrick J. Wong return error; 252ac27a0ecSDave Kleikamp } 253ac27a0ecSDave Kleikamp 254de05ca85STheodore Ts'o #define ext4_xattr_check_block(inode, bh) \ 255de05ca85STheodore Ts'o __ext4_xattr_check_block((inode), (bh), __func__, __LINE__) 256de05ca85STheodore Ts'o 257de05ca85STheodore Ts'o 2589e92f48cSTheodore Ts'o static int 2599e92f48cSTheodore Ts'o __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, 2609e92f48cSTheodore Ts'o void *end, const char *function, unsigned int line) 2619e92f48cSTheodore Ts'o { 2629e92f48cSTheodore Ts'o int error = -EFSCORRUPTED; 2639e92f48cSTheodore Ts'o 264290ab230SEric Biggers if (end - (void *)header < sizeof(*header) + sizeof(u32) || 26519962509SEric Biggers (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) 2669e92f48cSTheodore Ts'o goto errout; 2672c4f9923SEric Biggers error = ext4_xattr_check_entries(IFIRST(header), end, IFIRST(header)); 2689e92f48cSTheodore Ts'o errout: 2699e92f48cSTheodore Ts'o if (error) 2709e92f48cSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, 2719e92f48cSTheodore Ts'o "corrupted in-inode xattr"); 2729e92f48cSTheodore Ts'o return error; 2739e92f48cSTheodore Ts'o } 2749e92f48cSTheodore Ts'o 2759e92f48cSTheodore Ts'o #define xattr_check_inode(inode, header, end) \ 2769e92f48cSTheodore Ts'o __xattr_check_inode((inode), (header), (end), __func__, __LINE__) 2779e92f48cSTheodore Ts'o 278ac27a0ecSDave Kleikamp static int 2799496005dSTheodore Ts'o xattr_find_entry(struct inode *inode, struct ext4_xattr_entry **pentry, 2809496005dSTheodore Ts'o void *end, int name_index, const char *name, int sorted) 281ac27a0ecSDave Kleikamp { 2829496005dSTheodore Ts'o struct ext4_xattr_entry *entry, *next; 283ac27a0ecSDave Kleikamp size_t name_len; 284ac27a0ecSDave Kleikamp int cmp = 1; 285ac27a0ecSDave Kleikamp 286ac27a0ecSDave Kleikamp if (name == NULL) 287ac27a0ecSDave Kleikamp return -EINVAL; 288ac27a0ecSDave Kleikamp name_len = strlen(name); 2899496005dSTheodore Ts'o for (entry = *pentry; !IS_LAST_ENTRY(entry); entry = next) { 2909496005dSTheodore Ts'o next = EXT4_XATTR_NEXT(entry); 2919496005dSTheodore Ts'o if ((void *) next >= end) { 2929496005dSTheodore Ts'o EXT4_ERROR_INODE(inode, "corrupted xattr entries"); 2939496005dSTheodore Ts'o return -EFSCORRUPTED; 2949496005dSTheodore Ts'o } 295ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 296ac27a0ecSDave Kleikamp if (!cmp) 297ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 298ac27a0ecSDave Kleikamp if (!cmp) 299ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 300ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 301ac27a0ecSDave Kleikamp break; 302ac27a0ecSDave Kleikamp } 303ac27a0ecSDave Kleikamp *pentry = entry; 304ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 305ac27a0ecSDave Kleikamp } 306ac27a0ecSDave Kleikamp 307dec214d0STahsin Erdogan static u32 308dec214d0STahsin Erdogan ext4_xattr_inode_hash(struct ext4_sb_info *sbi, const void *buffer, size_t size) 309dec214d0STahsin Erdogan { 310dec214d0STahsin Erdogan return ext4_chksum(sbi, sbi->s_csum_seed, buffer, size); 311dec214d0STahsin Erdogan } 312dec214d0STahsin Erdogan 313dec214d0STahsin Erdogan static u64 ext4_xattr_inode_get_ref(struct inode *ea_inode) 314dec214d0STahsin Erdogan { 315dec214d0STahsin Erdogan return ((u64)ea_inode->i_ctime.tv_sec << 32) | 316ee73f9a5SJeff Layton (u32) inode_peek_iversion_raw(ea_inode); 317dec214d0STahsin Erdogan } 318dec214d0STahsin Erdogan 319dec214d0STahsin Erdogan static void ext4_xattr_inode_set_ref(struct inode *ea_inode, u64 ref_count) 320dec214d0STahsin Erdogan { 321dec214d0STahsin Erdogan ea_inode->i_ctime.tv_sec = (u32)(ref_count >> 32); 322ee73f9a5SJeff Layton inode_set_iversion_raw(ea_inode, ref_count & 0xffffffff); 323dec214d0STahsin Erdogan } 324dec214d0STahsin Erdogan 325dec214d0STahsin Erdogan static u32 ext4_xattr_inode_get_hash(struct inode *ea_inode) 326dec214d0STahsin Erdogan { 327dec214d0STahsin Erdogan return (u32)ea_inode->i_atime.tv_sec; 328dec214d0STahsin Erdogan } 329dec214d0STahsin Erdogan 330dec214d0STahsin Erdogan static void ext4_xattr_inode_set_hash(struct inode *ea_inode, u32 hash) 331dec214d0STahsin Erdogan { 332dec214d0STahsin Erdogan ea_inode->i_atime.tv_sec = hash; 333dec214d0STahsin Erdogan } 334dec214d0STahsin Erdogan 335e50e5129SAndreas Dilger /* 336e50e5129SAndreas Dilger * Read the EA value from an inode. 337e50e5129SAndreas Dilger */ 33890966693STahsin Erdogan static int ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t size) 339e50e5129SAndreas Dilger { 3409699d4f9STahsin Erdogan int blocksize = 1 << ea_inode->i_blkbits; 3419699d4f9STahsin Erdogan int bh_count = (size + blocksize - 1) >> ea_inode->i_blkbits; 3429699d4f9STahsin Erdogan int tail_size = (size % blocksize) ?: blocksize; 3439699d4f9STahsin Erdogan struct buffer_head *bhs_inline[8]; 3449699d4f9STahsin Erdogan struct buffer_head **bhs = bhs_inline; 3459699d4f9STahsin Erdogan int i, ret; 346e50e5129SAndreas Dilger 3479699d4f9STahsin Erdogan if (bh_count > ARRAY_SIZE(bhs_inline)) { 3489699d4f9STahsin Erdogan bhs = kmalloc_array(bh_count, sizeof(*bhs), GFP_NOFS); 3499699d4f9STahsin Erdogan if (!bhs) 3509699d4f9STahsin Erdogan return -ENOMEM; 351e50e5129SAndreas Dilger } 3529699d4f9STahsin Erdogan 3539699d4f9STahsin Erdogan ret = ext4_bread_batch(ea_inode, 0 /* block */, bh_count, 3549699d4f9STahsin Erdogan true /* wait */, bhs); 3559699d4f9STahsin Erdogan if (ret) 3569699d4f9STahsin Erdogan goto free_bhs; 3579699d4f9STahsin Erdogan 3589699d4f9STahsin Erdogan for (i = 0; i < bh_count; i++) { 3599699d4f9STahsin Erdogan /* There shouldn't be any holes in ea_inode. */ 3609699d4f9STahsin Erdogan if (!bhs[i]) { 3619699d4f9STahsin Erdogan ret = -EFSCORRUPTED; 3629699d4f9STahsin Erdogan goto put_bhs; 3639699d4f9STahsin Erdogan } 3649699d4f9STahsin Erdogan memcpy((char *)buf + blocksize * i, bhs[i]->b_data, 3659699d4f9STahsin Erdogan i < bh_count - 1 ? blocksize : tail_size); 3669699d4f9STahsin Erdogan } 3679699d4f9STahsin Erdogan ret = 0; 3689699d4f9STahsin Erdogan put_bhs: 3699699d4f9STahsin Erdogan for (i = 0; i < bh_count; i++) 3709699d4f9STahsin Erdogan brelse(bhs[i]); 3719699d4f9STahsin Erdogan free_bhs: 3729699d4f9STahsin Erdogan if (bhs != bhs_inline) 3739699d4f9STahsin Erdogan kfree(bhs); 3749699d4f9STahsin Erdogan return ret; 375e50e5129SAndreas Dilger } 376e50e5129SAndreas Dilger 377a6d05676STahsin Erdogan #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec) 378a6d05676STahsin Erdogan 379bab79b04STahsin Erdogan static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, 380a6d05676STahsin Erdogan u32 ea_inode_hash, struct inode **ea_inode) 381e50e5129SAndreas Dilger { 382bab79b04STahsin Erdogan struct inode *inode; 383bab79b04STahsin Erdogan int err; 384e50e5129SAndreas Dilger 385bab79b04STahsin Erdogan inode = ext4_iget(parent->i_sb, ea_ino); 386bab79b04STahsin Erdogan if (IS_ERR(inode)) { 387bab79b04STahsin Erdogan err = PTR_ERR(inode); 388dec214d0STahsin Erdogan ext4_error(parent->i_sb, 389dec214d0STahsin Erdogan "error while reading EA inode %lu err=%d", ea_ino, 390dec214d0STahsin Erdogan err); 391bab79b04STahsin Erdogan return err; 392e50e5129SAndreas Dilger } 393e50e5129SAndreas Dilger 394bab79b04STahsin Erdogan if (is_bad_inode(inode)) { 395dec214d0STahsin Erdogan ext4_error(parent->i_sb, 396dec214d0STahsin Erdogan "error while reading EA inode %lu is_bad_inode", 397dec214d0STahsin Erdogan ea_ino); 398bab79b04STahsin Erdogan err = -EIO; 399e50e5129SAndreas Dilger goto error; 400e50e5129SAndreas Dilger } 401e50e5129SAndreas Dilger 402bab79b04STahsin Erdogan if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) { 403dec214d0STahsin Erdogan ext4_error(parent->i_sb, 404dec214d0STahsin Erdogan "EA inode %lu does not have EXT4_EA_INODE_FL flag", 405dec214d0STahsin Erdogan ea_ino); 406bab79b04STahsin Erdogan err = -EINVAL; 407e50e5129SAndreas Dilger goto error; 408e50e5129SAndreas Dilger } 409e50e5129SAndreas Dilger 410a6d05676STahsin Erdogan ext4_xattr_inode_set_class(inode); 411a6d05676STahsin Erdogan 412a6d05676STahsin Erdogan /* 413a6d05676STahsin Erdogan * Check whether this is an old Lustre-style xattr inode. Lustre 414a6d05676STahsin Erdogan * implementation does not have hash validation, rather it has a 415a6d05676STahsin Erdogan * backpointer from ea_inode to the parent inode. 416a6d05676STahsin Erdogan */ 417a6d05676STahsin Erdogan if (ea_inode_hash != ext4_xattr_inode_get_hash(inode) && 418a6d05676STahsin Erdogan EXT4_XATTR_INODE_GET_PARENT(inode) == parent->i_ino && 419a6d05676STahsin Erdogan inode->i_generation == parent->i_generation) { 420a6d05676STahsin Erdogan ext4_set_inode_state(inode, EXT4_STATE_LUSTRE_EA_INODE); 421a6d05676STahsin Erdogan ext4_xattr_inode_set_ref(inode, 1); 422a6d05676STahsin Erdogan } else { 423a6d05676STahsin Erdogan inode_lock(inode); 424a6d05676STahsin Erdogan inode->i_flags |= S_NOQUOTA; 425a6d05676STahsin Erdogan inode_unlock(inode); 426a6d05676STahsin Erdogan } 427a6d05676STahsin Erdogan 428bab79b04STahsin Erdogan *ea_inode = inode; 429bab79b04STahsin Erdogan return 0; 430e50e5129SAndreas Dilger error: 431bab79b04STahsin Erdogan iput(inode); 432bab79b04STahsin Erdogan return err; 433e50e5129SAndreas Dilger } 434e50e5129SAndreas Dilger 435dec214d0STahsin Erdogan static int 436b9fc761eSTahsin Erdogan ext4_xattr_inode_verify_hashes(struct inode *ea_inode, 437b9fc761eSTahsin Erdogan struct ext4_xattr_entry *entry, void *buffer, 438b9fc761eSTahsin Erdogan size_t size) 439dec214d0STahsin Erdogan { 440dec214d0STahsin Erdogan u32 hash; 441dec214d0STahsin Erdogan 442dec214d0STahsin Erdogan /* Verify stored hash matches calculated hash. */ 443dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); 444dec214d0STahsin Erdogan if (hash != ext4_xattr_inode_get_hash(ea_inode)) 445dec214d0STahsin Erdogan return -EFSCORRUPTED; 446b9fc761eSTahsin Erdogan 447b9fc761eSTahsin Erdogan if (entry) { 448b9fc761eSTahsin Erdogan __le32 e_hash, tmp_data; 449b9fc761eSTahsin Erdogan 450b9fc761eSTahsin Erdogan /* Verify entry hash. */ 451b9fc761eSTahsin Erdogan tmp_data = cpu_to_le32(hash); 452b9fc761eSTahsin Erdogan e_hash = ext4_xattr_hash_entry(entry->e_name, entry->e_name_len, 453b9fc761eSTahsin Erdogan &tmp_data, 1); 454b9fc761eSTahsin Erdogan if (e_hash != entry->e_hash) 455b9fc761eSTahsin Erdogan return -EFSCORRUPTED; 456b9fc761eSTahsin Erdogan } 457dec214d0STahsin Erdogan return 0; 458dec214d0STahsin Erdogan } 459dec214d0STahsin Erdogan 460e50e5129SAndreas Dilger /* 461b9fc761eSTahsin Erdogan * Read xattr value from the EA inode. 462e50e5129SAndreas Dilger */ 463e50e5129SAndreas Dilger static int 464b9fc761eSTahsin Erdogan ext4_xattr_inode_get(struct inode *inode, struct ext4_xattr_entry *entry, 465b9fc761eSTahsin Erdogan void *buffer, size_t size) 466e50e5129SAndreas Dilger { 467dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 468bab79b04STahsin Erdogan struct inode *ea_inode; 469dec214d0STahsin Erdogan int err; 470e50e5129SAndreas Dilger 471b9fc761eSTahsin Erdogan err = ext4_xattr_inode_iget(inode, le32_to_cpu(entry->e_value_inum), 472a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), &ea_inode); 473dec214d0STahsin Erdogan if (err) { 474dec214d0STahsin Erdogan ea_inode = NULL; 475dec214d0STahsin Erdogan goto out; 476dec214d0STahsin Erdogan } 477e50e5129SAndreas Dilger 478dec214d0STahsin Erdogan if (i_size_read(ea_inode) != size) { 479dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 480dec214d0STahsin Erdogan "ea_inode file size=%llu entry size=%zu", 481dec214d0STahsin Erdogan i_size_read(ea_inode), size); 482dec214d0STahsin Erdogan err = -EFSCORRUPTED; 483dec214d0STahsin Erdogan goto out; 484dec214d0STahsin Erdogan } 485dec214d0STahsin Erdogan 486dec214d0STahsin Erdogan err = ext4_xattr_inode_read(ea_inode, buffer, size); 487dec214d0STahsin Erdogan if (err) 488dec214d0STahsin Erdogan goto out; 489dec214d0STahsin Erdogan 490a6d05676STahsin Erdogan if (!ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) { 491a6d05676STahsin Erdogan err = ext4_xattr_inode_verify_hashes(ea_inode, entry, buffer, 492a6d05676STahsin Erdogan size); 493a6d05676STahsin Erdogan if (err) { 494dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 495dec214d0STahsin Erdogan "EA inode hash validation failed"); 496dec214d0STahsin Erdogan goto out; 497dec214d0STahsin Erdogan } 498dec214d0STahsin Erdogan 499dec214d0STahsin Erdogan if (ea_inode_cache) 500dec214d0STahsin Erdogan mb_cache_entry_create(ea_inode_cache, GFP_NOFS, 501dec214d0STahsin Erdogan ext4_xattr_inode_get_hash(ea_inode), 502dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 503a6d05676STahsin Erdogan } 504dec214d0STahsin Erdogan out: 505e50e5129SAndreas Dilger iput(ea_inode); 506dec214d0STahsin Erdogan return err; 507e50e5129SAndreas Dilger } 508e50e5129SAndreas Dilger 509ac27a0ecSDave Kleikamp static int 510617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 511ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 512ac27a0ecSDave Kleikamp { 513ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 514617ba13bSMingming Cao struct ext4_xattr_entry *entry; 515ac27a0ecSDave Kleikamp size_t size; 5169496005dSTheodore Ts'o void *end; 517ac27a0ecSDave Kleikamp int error; 51847387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 519ac27a0ecSDave Kleikamp 520ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 521ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 522ac27a0ecSDave Kleikamp 523ac27a0ecSDave Kleikamp error = -ENODATA; 524617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 525ac27a0ecSDave Kleikamp goto cleanup; 526ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 527ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 528617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 529ac27a0ecSDave Kleikamp if (!bh) 530ac27a0ecSDave Kleikamp goto cleanup; 531ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 532ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 533de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 534de05ca85STheodore Ts'o if (error) 535ac27a0ecSDave Kleikamp goto cleanup; 53647387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bh); 537ac27a0ecSDave Kleikamp entry = BFIRST(bh); 5389496005dSTheodore Ts'o end = bh->b_data + bh->b_size; 5399496005dSTheodore Ts'o error = xattr_find_entry(inode, &entry, end, name_index, name, 1); 540ac27a0ecSDave Kleikamp if (error) 541ac27a0ecSDave Kleikamp goto cleanup; 542ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 543ac27a0ecSDave Kleikamp error = -ERANGE; 544*54dd0e0aSTheodore Ts'o if (unlikely(size > EXT4_XATTR_SIZE_MAX)) 545*54dd0e0aSTheodore Ts'o goto cleanup; 546*54dd0e0aSTheodore Ts'o if (buffer) { 547ac27a0ecSDave Kleikamp if (size > buffer_size) 548ac27a0ecSDave Kleikamp goto cleanup; 549e50e5129SAndreas Dilger if (entry->e_value_inum) { 550b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 551b9fc761eSTahsin Erdogan size); 552e50e5129SAndreas Dilger if (error) 553e50e5129SAndreas Dilger goto cleanup; 554e50e5129SAndreas Dilger } else { 555*54dd0e0aSTheodore Ts'o u16 offset = le16_to_cpu(entry->e_value_offs); 556*54dd0e0aSTheodore Ts'o void *p = bh->b_data + offset; 557*54dd0e0aSTheodore Ts'o 558*54dd0e0aSTheodore Ts'o if (unlikely(p + size > end)) 559*54dd0e0aSTheodore Ts'o goto cleanup; 560*54dd0e0aSTheodore Ts'o memcpy(buffer, p, size); 561e50e5129SAndreas Dilger } 562ac27a0ecSDave Kleikamp } 563ac27a0ecSDave Kleikamp error = size; 564ac27a0ecSDave Kleikamp 565ac27a0ecSDave Kleikamp cleanup: 566ac27a0ecSDave Kleikamp brelse(bh); 567ac27a0ecSDave Kleikamp return error; 568ac27a0ecSDave Kleikamp } 569ac27a0ecSDave Kleikamp 570879b3825STao Ma int 571617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 572ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 573ac27a0ecSDave Kleikamp { 574617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 575617ba13bSMingming Cao struct ext4_xattr_entry *entry; 576617ba13bSMingming Cao struct ext4_inode *raw_inode; 577617ba13bSMingming Cao struct ext4_iloc iloc; 578ac27a0ecSDave Kleikamp size_t size; 579ac27a0ecSDave Kleikamp void *end; 580ac27a0ecSDave Kleikamp int error; 581ac27a0ecSDave Kleikamp 58219f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 583ac27a0ecSDave Kleikamp return -ENODATA; 584617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 585ac27a0ecSDave Kleikamp if (error) 586ac27a0ecSDave Kleikamp return error; 587617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 588ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 589617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 5909e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 591ac27a0ecSDave Kleikamp if (error) 592ac27a0ecSDave Kleikamp goto cleanup; 5936ba644b9SEric Biggers entry = IFIRST(header); 5949496005dSTheodore Ts'o error = xattr_find_entry(inode, &entry, end, name_index, name, 0); 595ac27a0ecSDave Kleikamp if (error) 596ac27a0ecSDave Kleikamp goto cleanup; 597ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 598ac27a0ecSDave Kleikamp error = -ERANGE; 599*54dd0e0aSTheodore Ts'o if (unlikely(size > EXT4_XATTR_SIZE_MAX)) 600*54dd0e0aSTheodore Ts'o goto cleanup; 601*54dd0e0aSTheodore Ts'o if (buffer) { 602ac27a0ecSDave Kleikamp if (size > buffer_size) 603ac27a0ecSDave Kleikamp goto cleanup; 604e50e5129SAndreas Dilger if (entry->e_value_inum) { 605b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 606b9fc761eSTahsin Erdogan size); 607e50e5129SAndreas Dilger if (error) 608e50e5129SAndreas Dilger goto cleanup; 609e50e5129SAndreas Dilger } else { 610*54dd0e0aSTheodore Ts'o u16 offset = le16_to_cpu(entry->e_value_offs); 611*54dd0e0aSTheodore Ts'o void *p = (void *)IFIRST(header) + offset; 612*54dd0e0aSTheodore Ts'o 613*54dd0e0aSTheodore Ts'o if (unlikely(p + size > end)) 614*54dd0e0aSTheodore Ts'o goto cleanup; 615*54dd0e0aSTheodore Ts'o memcpy(buffer, p, size); 616ac27a0ecSDave Kleikamp } 617e50e5129SAndreas Dilger } 618ac27a0ecSDave Kleikamp error = size; 619ac27a0ecSDave Kleikamp 620ac27a0ecSDave Kleikamp cleanup: 621ac27a0ecSDave Kleikamp brelse(iloc.bh); 622ac27a0ecSDave Kleikamp return error; 623ac27a0ecSDave Kleikamp } 624ac27a0ecSDave Kleikamp 625ac27a0ecSDave Kleikamp /* 626617ba13bSMingming Cao * ext4_xattr_get() 627ac27a0ecSDave Kleikamp * 628ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 629ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 630ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 631ac27a0ecSDave Kleikamp * 632ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 633ac27a0ecSDave Kleikamp * used / required on success. 634ac27a0ecSDave Kleikamp */ 635ac27a0ecSDave Kleikamp int 636617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 637ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 638ac27a0ecSDave Kleikamp { 639ac27a0ecSDave Kleikamp int error; 640ac27a0ecSDave Kleikamp 6410db1ff22STheodore Ts'o if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 6420db1ff22STheodore Ts'o return -EIO; 6430db1ff22STheodore Ts'o 644230b8c1aSZhang Zhen if (strlen(name) > 255) 645230b8c1aSZhang Zhen return -ERANGE; 646230b8c1aSZhang Zhen 647617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 648617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 649ac27a0ecSDave Kleikamp buffer_size); 650ac27a0ecSDave Kleikamp if (error == -ENODATA) 651617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 652ac27a0ecSDave Kleikamp buffer_size); 653617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 654ac27a0ecSDave Kleikamp return error; 655ac27a0ecSDave Kleikamp } 656ac27a0ecSDave Kleikamp 657ac27a0ecSDave Kleikamp static int 658431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 659ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 660ac27a0ecSDave Kleikamp { 661ac27a0ecSDave Kleikamp size_t rest = buffer_size; 662ac27a0ecSDave Kleikamp 663617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 66411e27528SStephen Hemminger const struct xattr_handler *handler = 665617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 666ac27a0ecSDave Kleikamp 667764a5c6bSAndreas Gruenbacher if (handler && (!handler->list || handler->list(dentry))) { 668764a5c6bSAndreas Gruenbacher const char *prefix = handler->prefix ?: handler->name; 669764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 670764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 671764a5c6bSAndreas Gruenbacher 672ac27a0ecSDave Kleikamp if (buffer) { 673ac27a0ecSDave Kleikamp if (size > rest) 674ac27a0ecSDave Kleikamp return -ERANGE; 675764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 676764a5c6bSAndreas Gruenbacher buffer += prefix_len; 677764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 678764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 679764a5c6bSAndreas Gruenbacher *buffer++ = 0; 680ac27a0ecSDave Kleikamp } 681ac27a0ecSDave Kleikamp rest -= size; 682ac27a0ecSDave Kleikamp } 683ac27a0ecSDave Kleikamp } 684764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 685ac27a0ecSDave Kleikamp } 686ac27a0ecSDave Kleikamp 687ac27a0ecSDave Kleikamp static int 688431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 689ac27a0ecSDave Kleikamp { 6902b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 691ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 692ac27a0ecSDave Kleikamp int error; 693ac27a0ecSDave Kleikamp 694ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 695ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 696ac27a0ecSDave Kleikamp 697ac27a0ecSDave Kleikamp error = 0; 698617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 699ac27a0ecSDave Kleikamp goto cleanup; 700ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 701ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 702617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 703ac27a0ecSDave Kleikamp error = -EIO; 704ac27a0ecSDave Kleikamp if (!bh) 705ac27a0ecSDave Kleikamp goto cleanup; 706ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 707ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 708de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 709de05ca85STheodore Ts'o if (error) 710ac27a0ecSDave Kleikamp goto cleanup; 71147387409STahsin Erdogan ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); 712431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size); 713ac27a0ecSDave Kleikamp 714ac27a0ecSDave Kleikamp cleanup: 715ac27a0ecSDave Kleikamp brelse(bh); 716ac27a0ecSDave Kleikamp 717ac27a0ecSDave Kleikamp return error; 718ac27a0ecSDave Kleikamp } 719ac27a0ecSDave Kleikamp 720ac27a0ecSDave Kleikamp static int 721431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 722ac27a0ecSDave Kleikamp { 7232b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 724617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 725617ba13bSMingming Cao struct ext4_inode *raw_inode; 726617ba13bSMingming Cao struct ext4_iloc iloc; 727ac27a0ecSDave Kleikamp void *end; 728ac27a0ecSDave Kleikamp int error; 729ac27a0ecSDave Kleikamp 73019f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 731ac27a0ecSDave Kleikamp return 0; 732617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 733ac27a0ecSDave Kleikamp if (error) 734ac27a0ecSDave Kleikamp return error; 735617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 736ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 737617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 7389e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 739ac27a0ecSDave Kleikamp if (error) 740ac27a0ecSDave Kleikamp goto cleanup; 741431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 742ac27a0ecSDave Kleikamp buffer, buffer_size); 743ac27a0ecSDave Kleikamp 744ac27a0ecSDave Kleikamp cleanup: 745ac27a0ecSDave Kleikamp brelse(iloc.bh); 746ac27a0ecSDave Kleikamp return error; 747ac27a0ecSDave Kleikamp } 748ac27a0ecSDave Kleikamp 749ac27a0ecSDave Kleikamp /* 750ba7ea1d8SEric Biggers * Inode operation listxattr() 751ba7ea1d8SEric Biggers * 752ba7ea1d8SEric Biggers * d_inode(dentry)->i_rwsem: don't care 753ac27a0ecSDave Kleikamp * 754ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 755ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 756ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 757ac27a0ecSDave Kleikamp * 758ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 759ac27a0ecSDave Kleikamp * used / required on success. 760ac27a0ecSDave Kleikamp */ 761ba7ea1d8SEric Biggers ssize_t 762ba7ea1d8SEric Biggers ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) 763ac27a0ecSDave Kleikamp { 764eaeef867STheodore Ts'o int ret, ret2; 765ac27a0ecSDave Kleikamp 7662b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 767eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 768eaeef867STheodore Ts'o if (ret < 0) 769eaeef867STheodore Ts'o goto errout; 770ac27a0ecSDave Kleikamp if (buffer) { 771eaeef867STheodore Ts'o buffer += ret; 772eaeef867STheodore Ts'o buffer_size -= ret; 773ac27a0ecSDave Kleikamp } 774eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 775eaeef867STheodore Ts'o if (ret < 0) 776eaeef867STheodore Ts'o goto errout; 777eaeef867STheodore Ts'o ret += ret2; 778eaeef867STheodore Ts'o errout: 7792b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 780eaeef867STheodore Ts'o return ret; 781ac27a0ecSDave Kleikamp } 782ac27a0ecSDave Kleikamp 783ac27a0ecSDave Kleikamp /* 784617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 785ac27a0ecSDave Kleikamp * not set, set it. 786ac27a0ecSDave Kleikamp */ 787617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 788ac27a0ecSDave Kleikamp struct super_block *sb) 789ac27a0ecSDave Kleikamp { 790e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 791ac27a0ecSDave Kleikamp return; 792ac27a0ecSDave Kleikamp 7935d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 794617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 795e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 796a0375156STheodore Ts'o ext4_handle_dirty_super(handle, sb); 797ac27a0ecSDave Kleikamp } 798ac27a0ecSDave Kleikamp } 799ac27a0ecSDave Kleikamp 8007a9ca53aSTahsin Erdogan int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) 8017a9ca53aSTahsin Erdogan { 8027a9ca53aSTahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 8037a9ca53aSTahsin Erdogan struct buffer_head *bh = NULL; 8047a9ca53aSTahsin Erdogan struct ext4_inode *raw_inode; 8057a9ca53aSTahsin Erdogan struct ext4_xattr_ibody_header *header; 8067a9ca53aSTahsin Erdogan struct ext4_xattr_entry *entry; 8077a9ca53aSTahsin Erdogan qsize_t ea_inode_refs = 0; 8087a9ca53aSTahsin Erdogan void *end; 8097a9ca53aSTahsin Erdogan int ret; 8107a9ca53aSTahsin Erdogan 8117a9ca53aSTahsin Erdogan lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); 8127a9ca53aSTahsin Erdogan 8137a9ca53aSTahsin Erdogan if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 8147a9ca53aSTahsin Erdogan ret = ext4_get_inode_loc(inode, &iloc); 8157a9ca53aSTahsin Erdogan if (ret) 8167a9ca53aSTahsin Erdogan goto out; 8177a9ca53aSTahsin Erdogan raw_inode = ext4_raw_inode(&iloc); 8187a9ca53aSTahsin Erdogan header = IHDR(inode, raw_inode); 8197a9ca53aSTahsin Erdogan end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 8207a9ca53aSTahsin Erdogan ret = xattr_check_inode(inode, header, end); 8217a9ca53aSTahsin Erdogan if (ret) 8227a9ca53aSTahsin Erdogan goto out; 8237a9ca53aSTahsin Erdogan 8247a9ca53aSTahsin Erdogan for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); 8257a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 8267a9ca53aSTahsin Erdogan if (entry->e_value_inum) 8277a9ca53aSTahsin Erdogan ea_inode_refs++; 8287a9ca53aSTahsin Erdogan } 8297a9ca53aSTahsin Erdogan 8307a9ca53aSTahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 8317a9ca53aSTahsin Erdogan bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 8327a9ca53aSTahsin Erdogan if (!bh) { 8337a9ca53aSTahsin Erdogan ret = -EIO; 8347a9ca53aSTahsin Erdogan goto out; 8357a9ca53aSTahsin Erdogan } 8367a9ca53aSTahsin Erdogan 837de05ca85STheodore Ts'o ret = ext4_xattr_check_block(inode, bh); 838de05ca85STheodore Ts'o if (ret) 8397a9ca53aSTahsin Erdogan goto out; 8407a9ca53aSTahsin Erdogan 8417a9ca53aSTahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 8427a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 8437a9ca53aSTahsin Erdogan if (entry->e_value_inum) 8447a9ca53aSTahsin Erdogan ea_inode_refs++; 8457a9ca53aSTahsin Erdogan } 8467a9ca53aSTahsin Erdogan *usage = ea_inode_refs + 1; 8477a9ca53aSTahsin Erdogan ret = 0; 8487a9ca53aSTahsin Erdogan out: 8497a9ca53aSTahsin Erdogan brelse(iloc.bh); 8507a9ca53aSTahsin Erdogan brelse(bh); 8517a9ca53aSTahsin Erdogan return ret; 8527a9ca53aSTahsin Erdogan } 8537a9ca53aSTahsin Erdogan 854dec214d0STahsin Erdogan static inline size_t round_up_cluster(struct inode *inode, size_t length) 855dec214d0STahsin Erdogan { 856dec214d0STahsin Erdogan struct super_block *sb = inode->i_sb; 857dec214d0STahsin Erdogan size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + 858dec214d0STahsin Erdogan inode->i_blkbits); 859dec214d0STahsin Erdogan size_t mask = ~(cluster_size - 1); 860dec214d0STahsin Erdogan 861dec214d0STahsin Erdogan return (length + cluster_size - 1) & mask; 862dec214d0STahsin Erdogan } 863dec214d0STahsin Erdogan 864dec214d0STahsin Erdogan static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) 865dec214d0STahsin Erdogan { 866dec214d0STahsin Erdogan int err; 867dec214d0STahsin Erdogan 868dec214d0STahsin Erdogan err = dquot_alloc_inode(inode); 869dec214d0STahsin Erdogan if (err) 870dec214d0STahsin Erdogan return err; 871dec214d0STahsin Erdogan err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); 872dec214d0STahsin Erdogan if (err) 873dec214d0STahsin Erdogan dquot_free_inode(inode); 874dec214d0STahsin Erdogan return err; 875dec214d0STahsin Erdogan } 876dec214d0STahsin Erdogan 877a6d05676STahsin Erdogan static void ext4_xattr_inode_free_quota(struct inode *parent, 878a6d05676STahsin Erdogan struct inode *ea_inode, 879a6d05676STahsin Erdogan size_t len) 880dec214d0STahsin Erdogan { 881a6d05676STahsin Erdogan if (ea_inode && 882a6d05676STahsin Erdogan ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) 883a6d05676STahsin Erdogan return; 884a6d05676STahsin Erdogan dquot_free_space_nodirty(parent, round_up_cluster(parent, len)); 885a6d05676STahsin Erdogan dquot_free_inode(parent); 886dec214d0STahsin Erdogan } 887dec214d0STahsin Erdogan 888af65207cSTahsin Erdogan int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode, 889af65207cSTahsin Erdogan struct buffer_head *block_bh, size_t value_len, 890af65207cSTahsin Erdogan bool is_create) 891dec214d0STahsin Erdogan { 892dec214d0STahsin Erdogan int credits; 893dec214d0STahsin Erdogan int blocks; 894dec214d0STahsin Erdogan 895dec214d0STahsin Erdogan /* 896dec214d0STahsin Erdogan * 1) Owner inode update 897dec214d0STahsin Erdogan * 2) Ref count update on old xattr block 898dec214d0STahsin Erdogan * 3) new xattr block 899dec214d0STahsin Erdogan * 4) block bitmap update for new xattr block 900dec214d0STahsin Erdogan * 5) group descriptor for new xattr block 901dec214d0STahsin Erdogan * 6) block bitmap update for old xattr block 902dec214d0STahsin Erdogan * 7) group descriptor for old block 903dec214d0STahsin Erdogan * 904dec214d0STahsin Erdogan * 6 & 7 can happen if we have two racing threads T_a and T_b 905dec214d0STahsin Erdogan * which are each trying to set an xattr on inodes I_a and I_b 906dec214d0STahsin Erdogan * which were both initially sharing an xattr block. 907dec214d0STahsin Erdogan */ 908dec214d0STahsin Erdogan credits = 7; 909dec214d0STahsin Erdogan 910dec214d0STahsin Erdogan /* Quota updates. */ 911dec214d0STahsin Erdogan credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); 912dec214d0STahsin Erdogan 913dec214d0STahsin Erdogan /* 914dec214d0STahsin Erdogan * In case of inline data, we may push out the data to a block, 915dec214d0STahsin Erdogan * so we need to reserve credits for this eventuality 916dec214d0STahsin Erdogan */ 917af65207cSTahsin Erdogan if (inode && ext4_has_inline_data(inode)) 918dec214d0STahsin Erdogan credits += ext4_writepage_trans_blocks(inode) + 1; 919dec214d0STahsin Erdogan 920dec214d0STahsin Erdogan /* We are done if ea_inode feature is not enabled. */ 921dec214d0STahsin Erdogan if (!ext4_has_feature_ea_inode(sb)) 922dec214d0STahsin Erdogan return credits; 923dec214d0STahsin Erdogan 924dec214d0STahsin Erdogan /* New ea_inode, inode map, block bitmap, group descriptor. */ 925dec214d0STahsin Erdogan credits += 4; 926dec214d0STahsin Erdogan 927dec214d0STahsin Erdogan /* Data blocks. */ 928dec214d0STahsin Erdogan blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 929dec214d0STahsin Erdogan 930dec214d0STahsin Erdogan /* Indirection block or one level of extent tree. */ 931dec214d0STahsin Erdogan blocks += 1; 932dec214d0STahsin Erdogan 933dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 934dec214d0STahsin Erdogan credits += blocks * 2; 935dec214d0STahsin Erdogan 936dec214d0STahsin Erdogan /* Blocks themselves. */ 937dec214d0STahsin Erdogan credits += blocks; 938dec214d0STahsin Erdogan 939af65207cSTahsin Erdogan if (!is_create) { 940dec214d0STahsin Erdogan /* Dereference ea_inode holding old xattr value. 941dec214d0STahsin Erdogan * Old ea_inode, inode map, block bitmap, group descriptor. 942dec214d0STahsin Erdogan */ 943dec214d0STahsin Erdogan credits += 4; 944dec214d0STahsin Erdogan 945dec214d0STahsin Erdogan /* Data blocks for old ea_inode. */ 946dec214d0STahsin Erdogan blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; 947dec214d0STahsin Erdogan 948af65207cSTahsin Erdogan /* Indirection block or one level of extent tree for old 949af65207cSTahsin Erdogan * ea_inode. 950af65207cSTahsin Erdogan */ 951dec214d0STahsin Erdogan blocks += 1; 952dec214d0STahsin Erdogan 953dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 954dec214d0STahsin Erdogan credits += blocks * 2; 955af65207cSTahsin Erdogan } 956dec214d0STahsin Erdogan 957dec214d0STahsin Erdogan /* We may need to clone the existing xattr block in which case we need 958dec214d0STahsin Erdogan * to increment ref counts for existing ea_inodes referenced by it. 959dec214d0STahsin Erdogan */ 960dec214d0STahsin Erdogan if (block_bh) { 961dec214d0STahsin Erdogan struct ext4_xattr_entry *entry = BFIRST(block_bh); 962dec214d0STahsin Erdogan 963dec214d0STahsin Erdogan for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) 964dec214d0STahsin Erdogan if (entry->e_value_inum) 965dec214d0STahsin Erdogan /* Ref count update on ea_inode. */ 966dec214d0STahsin Erdogan credits += 1; 967dec214d0STahsin Erdogan } 968dec214d0STahsin Erdogan return credits; 969dec214d0STahsin Erdogan } 970dec214d0STahsin Erdogan 97130a7eb97STahsin Erdogan static int ext4_xattr_ensure_credits(handle_t *handle, struct inode *inode, 97230a7eb97STahsin Erdogan int credits, struct buffer_head *bh, 97330a7eb97STahsin Erdogan bool dirty, bool block_csum) 97430a7eb97STahsin Erdogan { 97530a7eb97STahsin Erdogan int error; 97630a7eb97STahsin Erdogan 97730a7eb97STahsin Erdogan if (!ext4_handle_valid(handle)) 97830a7eb97STahsin Erdogan return 0; 97930a7eb97STahsin Erdogan 98030a7eb97STahsin Erdogan if (handle->h_buffer_credits >= credits) 98130a7eb97STahsin Erdogan return 0; 98230a7eb97STahsin Erdogan 98330a7eb97STahsin Erdogan error = ext4_journal_extend(handle, credits - handle->h_buffer_credits); 98430a7eb97STahsin Erdogan if (!error) 98530a7eb97STahsin Erdogan return 0; 98630a7eb97STahsin Erdogan if (error < 0) { 98730a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Extend journal (error %d)", error); 98830a7eb97STahsin Erdogan return error; 98930a7eb97STahsin Erdogan } 99030a7eb97STahsin Erdogan 99130a7eb97STahsin Erdogan if (bh && dirty) { 99230a7eb97STahsin Erdogan if (block_csum) 99330a7eb97STahsin Erdogan ext4_xattr_block_csum_set(inode, bh); 99430a7eb97STahsin Erdogan error = ext4_handle_dirty_metadata(handle, NULL, bh); 99530a7eb97STahsin Erdogan if (error) { 99630a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Handle metadata (error %d)", 99730a7eb97STahsin Erdogan error); 99830a7eb97STahsin Erdogan return error; 99930a7eb97STahsin Erdogan } 100030a7eb97STahsin Erdogan } 100130a7eb97STahsin Erdogan 100230a7eb97STahsin Erdogan error = ext4_journal_restart(handle, credits); 100330a7eb97STahsin Erdogan if (error) { 100430a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Restart journal (error %d)", error); 100530a7eb97STahsin Erdogan return error; 100630a7eb97STahsin Erdogan } 100730a7eb97STahsin Erdogan 100830a7eb97STahsin Erdogan if (bh) { 100930a7eb97STahsin Erdogan error = ext4_journal_get_write_access(handle, bh); 101030a7eb97STahsin Erdogan if (error) { 101130a7eb97STahsin Erdogan ext4_warning(inode->i_sb, 101230a7eb97STahsin Erdogan "Get write access failed (error %d)", 101330a7eb97STahsin Erdogan error); 101430a7eb97STahsin Erdogan return error; 101530a7eb97STahsin Erdogan } 101630a7eb97STahsin Erdogan } 101730a7eb97STahsin Erdogan return 0; 101830a7eb97STahsin Erdogan } 101930a7eb97STahsin Erdogan 1020dec214d0STahsin Erdogan static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, 1021dec214d0STahsin Erdogan int ref_change) 1022dec214d0STahsin Erdogan { 1023dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(ea_inode); 1024dec214d0STahsin Erdogan struct ext4_iloc iloc; 1025dec214d0STahsin Erdogan s64 ref_count; 1026dec214d0STahsin Erdogan u32 hash; 1027dec214d0STahsin Erdogan int ret; 1028dec214d0STahsin Erdogan 1029dec214d0STahsin Erdogan inode_lock(ea_inode); 1030dec214d0STahsin Erdogan 1031dec214d0STahsin Erdogan ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); 1032dec214d0STahsin Erdogan if (ret) { 1033dec214d0STahsin Erdogan iloc.bh = NULL; 1034dec214d0STahsin Erdogan goto out; 1035dec214d0STahsin Erdogan } 1036dec214d0STahsin Erdogan 1037dec214d0STahsin Erdogan ref_count = ext4_xattr_inode_get_ref(ea_inode); 1038dec214d0STahsin Erdogan ref_count += ref_change; 1039dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, ref_count); 1040dec214d0STahsin Erdogan 1041dec214d0STahsin Erdogan if (ref_change > 0) { 1042dec214d0STahsin Erdogan WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", 1043dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1044dec214d0STahsin Erdogan 1045dec214d0STahsin Erdogan if (ref_count == 1) { 1046dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", 1047dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1048dec214d0STahsin Erdogan 1049dec214d0STahsin Erdogan set_nlink(ea_inode, 1); 1050dec214d0STahsin Erdogan ext4_orphan_del(handle, ea_inode); 1051dec214d0STahsin Erdogan 1052cdb7ee4cSTahsin Erdogan if (ea_inode_cache) { 1053dec214d0STahsin Erdogan hash = ext4_xattr_inode_get_hash(ea_inode); 1054cdb7ee4cSTahsin Erdogan mb_cache_entry_create(ea_inode_cache, 1055cdb7ee4cSTahsin Erdogan GFP_NOFS, hash, 1056dec214d0STahsin Erdogan ea_inode->i_ino, 1057dec214d0STahsin Erdogan true /* reusable */); 1058dec214d0STahsin Erdogan } 1059cdb7ee4cSTahsin Erdogan } 1060dec214d0STahsin Erdogan } else { 1061dec214d0STahsin Erdogan WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", 1062dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1063dec214d0STahsin Erdogan 1064dec214d0STahsin Erdogan if (ref_count == 0) { 1065dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink != 1, 1066dec214d0STahsin Erdogan "EA inode %lu i_nlink=%u", 1067dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1068dec214d0STahsin Erdogan 1069dec214d0STahsin Erdogan clear_nlink(ea_inode); 1070dec214d0STahsin Erdogan ext4_orphan_add(handle, ea_inode); 1071dec214d0STahsin Erdogan 1072cdb7ee4cSTahsin Erdogan if (ea_inode_cache) { 1073dec214d0STahsin Erdogan hash = ext4_xattr_inode_get_hash(ea_inode); 1074dec214d0STahsin Erdogan mb_cache_entry_delete(ea_inode_cache, hash, 1075dec214d0STahsin Erdogan ea_inode->i_ino); 1076dec214d0STahsin Erdogan } 1077dec214d0STahsin Erdogan } 1078cdb7ee4cSTahsin Erdogan } 1079dec214d0STahsin Erdogan 1080dec214d0STahsin Erdogan ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); 1081dec214d0STahsin Erdogan iloc.bh = NULL; 1082dec214d0STahsin Erdogan if (ret) 1083dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 1084dec214d0STahsin Erdogan "ext4_mark_iloc_dirty() failed ret=%d", ret); 1085dec214d0STahsin Erdogan out: 1086dec214d0STahsin Erdogan brelse(iloc.bh); 1087dec214d0STahsin Erdogan inode_unlock(ea_inode); 1088dec214d0STahsin Erdogan return ret; 1089dec214d0STahsin Erdogan } 1090dec214d0STahsin Erdogan 1091dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) 1092dec214d0STahsin Erdogan { 1093dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, 1); 1094dec214d0STahsin Erdogan } 1095dec214d0STahsin Erdogan 1096dec214d0STahsin Erdogan static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) 1097dec214d0STahsin Erdogan { 1098dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, -1); 1099dec214d0STahsin Erdogan } 1100dec214d0STahsin Erdogan 1101dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, 1102dec214d0STahsin Erdogan struct ext4_xattr_entry *first) 1103dec214d0STahsin Erdogan { 1104dec214d0STahsin Erdogan struct inode *ea_inode; 1105dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 1106dec214d0STahsin Erdogan struct ext4_xattr_entry *failed_entry; 1107dec214d0STahsin Erdogan unsigned int ea_ino; 1108dec214d0STahsin Erdogan int err, saved_err; 1109dec214d0STahsin Erdogan 1110dec214d0STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 1111dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1112dec214d0STahsin Erdogan if (!entry->e_value_inum) 1113dec214d0STahsin Erdogan continue; 1114dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1115a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1116a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1117a6d05676STahsin Erdogan &ea_inode); 1118dec214d0STahsin Erdogan if (err) 1119dec214d0STahsin Erdogan goto cleanup; 1120dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1121dec214d0STahsin Erdogan if (err) { 1122dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "inc ref error %d", err); 1123dec214d0STahsin Erdogan iput(ea_inode); 1124dec214d0STahsin Erdogan goto cleanup; 1125dec214d0STahsin Erdogan } 1126dec214d0STahsin Erdogan iput(ea_inode); 1127dec214d0STahsin Erdogan } 1128dec214d0STahsin Erdogan return 0; 1129dec214d0STahsin Erdogan 1130dec214d0STahsin Erdogan cleanup: 1131dec214d0STahsin Erdogan saved_err = err; 1132dec214d0STahsin Erdogan failed_entry = entry; 1133dec214d0STahsin Erdogan 1134dec214d0STahsin Erdogan for (entry = first; entry != failed_entry; 1135dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1136dec214d0STahsin Erdogan if (!entry->e_value_inum) 1137dec214d0STahsin Erdogan continue; 1138dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1139a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1140a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1141a6d05676STahsin Erdogan &ea_inode); 1142dec214d0STahsin Erdogan if (err) { 1143dec214d0STahsin Erdogan ext4_warning(parent->i_sb, 1144dec214d0STahsin Erdogan "cleanup ea_ino %u iget error %d", ea_ino, 1145dec214d0STahsin Erdogan err); 1146dec214d0STahsin Erdogan continue; 1147dec214d0STahsin Erdogan } 1148dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1149dec214d0STahsin Erdogan if (err) 1150dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "cleanup dec ref error %d", 1151dec214d0STahsin Erdogan err); 1152dec214d0STahsin Erdogan iput(ea_inode); 1153dec214d0STahsin Erdogan } 1154dec214d0STahsin Erdogan return saved_err; 1155dec214d0STahsin Erdogan } 1156dec214d0STahsin Erdogan 115730a7eb97STahsin Erdogan static void 1158dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, 115930a7eb97STahsin Erdogan struct buffer_head *bh, 116030a7eb97STahsin Erdogan struct ext4_xattr_entry *first, bool block_csum, 116130a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1162dec214d0STahsin Erdogan int extra_credits, bool skip_quota) 116330a7eb97STahsin Erdogan { 116430a7eb97STahsin Erdogan struct inode *ea_inode; 116530a7eb97STahsin Erdogan struct ext4_xattr_entry *entry; 116630a7eb97STahsin Erdogan bool dirty = false; 116730a7eb97STahsin Erdogan unsigned int ea_ino; 116830a7eb97STahsin Erdogan int err; 116930a7eb97STahsin Erdogan int credits; 117030a7eb97STahsin Erdogan 117130a7eb97STahsin Erdogan /* One credit for dec ref on ea_inode, one for orphan list addition, */ 117230a7eb97STahsin Erdogan credits = 2 + extra_credits; 117330a7eb97STahsin Erdogan 117430a7eb97STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 117530a7eb97STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 117630a7eb97STahsin Erdogan if (!entry->e_value_inum) 117730a7eb97STahsin Erdogan continue; 117830a7eb97STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1179a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1180a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1181a6d05676STahsin Erdogan &ea_inode); 118230a7eb97STahsin Erdogan if (err) 118330a7eb97STahsin Erdogan continue; 118430a7eb97STahsin Erdogan 118530a7eb97STahsin Erdogan err = ext4_expand_inode_array(ea_inode_array, ea_inode); 118630a7eb97STahsin Erdogan if (err) { 118730a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, 118830a7eb97STahsin Erdogan "Expand inode array err=%d", err); 118930a7eb97STahsin Erdogan iput(ea_inode); 119030a7eb97STahsin Erdogan continue; 119130a7eb97STahsin Erdogan } 119230a7eb97STahsin Erdogan 119330a7eb97STahsin Erdogan err = ext4_xattr_ensure_credits(handle, parent, credits, bh, 119430a7eb97STahsin Erdogan dirty, block_csum); 119530a7eb97STahsin Erdogan if (err) { 119630a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, "Ensure credits err=%d", 119730a7eb97STahsin Erdogan err); 119830a7eb97STahsin Erdogan continue; 119930a7eb97STahsin Erdogan } 120030a7eb97STahsin Erdogan 1201dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1202dec214d0STahsin Erdogan if (err) { 1203dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", 1204dec214d0STahsin Erdogan err); 1205dec214d0STahsin Erdogan continue; 1206dec214d0STahsin Erdogan } 1207dec214d0STahsin Erdogan 1208dec214d0STahsin Erdogan if (!skip_quota) 1209a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(parent, ea_inode, 1210dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 121130a7eb97STahsin Erdogan 121230a7eb97STahsin Erdogan /* 121330a7eb97STahsin Erdogan * Forget about ea_inode within the same transaction that 121430a7eb97STahsin Erdogan * decrements the ref count. This avoids duplicate decrements in 121530a7eb97STahsin Erdogan * case the rest of the work spills over to subsequent 121630a7eb97STahsin Erdogan * transactions. 121730a7eb97STahsin Erdogan */ 121830a7eb97STahsin Erdogan entry->e_value_inum = 0; 121930a7eb97STahsin Erdogan entry->e_value_size = 0; 122030a7eb97STahsin Erdogan 122130a7eb97STahsin Erdogan dirty = true; 122230a7eb97STahsin Erdogan } 122330a7eb97STahsin Erdogan 122430a7eb97STahsin Erdogan if (dirty) { 122530a7eb97STahsin Erdogan /* 122630a7eb97STahsin Erdogan * Note that we are deliberately skipping csum calculation for 122730a7eb97STahsin Erdogan * the final update because we do not expect any journal 122830a7eb97STahsin Erdogan * restarts until xattr block is freed. 122930a7eb97STahsin Erdogan */ 123030a7eb97STahsin Erdogan 123130a7eb97STahsin Erdogan err = ext4_handle_dirty_metadata(handle, NULL, bh); 123230a7eb97STahsin Erdogan if (err) 123330a7eb97STahsin Erdogan ext4_warning_inode(parent, 123430a7eb97STahsin Erdogan "handle dirty metadata err=%d", err); 123530a7eb97STahsin Erdogan } 123630a7eb97STahsin Erdogan } 123730a7eb97STahsin Erdogan 1238ac27a0ecSDave Kleikamp /* 1239ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 1240ec4cb1aaSJan Kara * otherwise free the block. 1241ac27a0ecSDave Kleikamp */ 1242ac27a0ecSDave Kleikamp static void 1243617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 1244dec214d0STahsin Erdogan struct buffer_head *bh, 1245dec214d0STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1246dec214d0STahsin Erdogan int extra_credits) 1247ac27a0ecSDave Kleikamp { 124847387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 12496048c64bSAndreas Gruenbacher u32 hash, ref; 12508a2bfdcbSMingming Cao int error = 0; 1251ac27a0ecSDave Kleikamp 12525d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 12538a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 12548a2bfdcbSMingming Cao if (error) 12558a2bfdcbSMingming Cao goto out; 12568a2bfdcbSMingming Cao 12578a2bfdcbSMingming Cao lock_buffer(bh); 12586048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 12596048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 12606048c64bSAndreas Gruenbacher if (ref == 1) { 1261ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 126282939d79SJan Kara /* 126382939d79SJan Kara * This must happen under buffer lock for 126482939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 126582939d79SJan Kara */ 1266cdb7ee4cSTahsin Erdogan if (ea_block_cache) 1267cdb7ee4cSTahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, 1268cdb7ee4cSTahsin Erdogan bh->b_blocknr); 1269ac27a0ecSDave Kleikamp get_bh(bh); 1270ec4cb1aaSJan Kara unlock_buffer(bh); 1271dec214d0STahsin Erdogan 1272dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) 1273dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, bh, 1274dec214d0STahsin Erdogan BFIRST(bh), 1275dec214d0STahsin Erdogan true /* block_csum */, 1276dec214d0STahsin Erdogan ea_inode_array, 1277dec214d0STahsin Erdogan extra_credits, 1278dec214d0STahsin Erdogan true /* skip_quota */); 1279e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 1280e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 1281e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 1282ac27a0ecSDave Kleikamp } else { 12836048c64bSAndreas Gruenbacher ref--; 12846048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 12856048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 12866048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 12876048c64bSAndreas Gruenbacher 1288cdb7ee4cSTahsin Erdogan if (ea_block_cache) { 128947387409STahsin Erdogan ce = mb_cache_entry_get(ea_block_cache, hash, 12906048c64bSAndreas Gruenbacher bh->b_blocknr); 12916048c64bSAndreas Gruenbacher if (ce) { 12926048c64bSAndreas Gruenbacher ce->e_reusable = 1; 129347387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 12946048c64bSAndreas Gruenbacher } 12956048c64bSAndreas Gruenbacher } 1296cdb7ee4cSTahsin Erdogan } 12976048c64bSAndreas Gruenbacher 1298dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bh); 1299ec4cb1aaSJan Kara /* 1300ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 1301ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 1302ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 1303ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 1304ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 1305dac7a4b4STheodore Ts'o * call ext4_handle_dirty_metadata() with locked buffer as 1306ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 1307ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 1308ec4cb1aaSJan Kara */ 1309ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 1310dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1311c1bb05a6SEric Sandeen unlock_buffer(bh); 1312ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 1313dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1314ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 13150390131bSFrank Mayhar ext4_handle_sync(handle); 13161231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 1317ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 1318ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 1319ac27a0ecSDave Kleikamp } 13208a2bfdcbSMingming Cao out: 13218a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 13228a2bfdcbSMingming Cao return; 1323ac27a0ecSDave Kleikamp } 1324ac27a0ecSDave Kleikamp 13256dd4ee7cSKalpak Shah /* 13266dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 13276dd4ee7cSKalpak Shah * bytes used by EA entries. 13286dd4ee7cSKalpak Shah */ 13296dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 13306dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 13316dd4ee7cSKalpak Shah { 13326dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1333e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 13346dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 13356dd4ee7cSKalpak Shah if (offs < *min_offs) 13366dd4ee7cSKalpak Shah *min_offs = offs; 13376dd4ee7cSKalpak Shah } 13387b1b2c1bSTheodore Ts'o if (total) 13397b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 13406dd4ee7cSKalpak Shah } 13416dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 13426dd4ee7cSKalpak Shah } 13436dd4ee7cSKalpak Shah 1344e50e5129SAndreas Dilger /* 1345e50e5129SAndreas Dilger * Write the value of the EA in an inode. 1346e50e5129SAndreas Dilger */ 1347e50e5129SAndreas Dilger static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, 1348e50e5129SAndreas Dilger const void *buf, int bufsize) 1349e50e5129SAndreas Dilger { 1350e50e5129SAndreas Dilger struct buffer_head *bh = NULL; 1351e50e5129SAndreas Dilger unsigned long block = 0; 1352dec214d0STahsin Erdogan int blocksize = ea_inode->i_sb->s_blocksize; 1353dec214d0STahsin Erdogan int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; 1354e50e5129SAndreas Dilger int csize, wsize = 0; 1355e50e5129SAndreas Dilger int ret = 0; 1356e50e5129SAndreas Dilger int retries = 0; 1357e50e5129SAndreas Dilger 1358e50e5129SAndreas Dilger retry: 1359e50e5129SAndreas Dilger while (ret >= 0 && ret < max_blocks) { 1360e50e5129SAndreas Dilger struct ext4_map_blocks map; 1361e50e5129SAndreas Dilger map.m_lblk = block += ret; 1362e50e5129SAndreas Dilger map.m_len = max_blocks -= ret; 1363e50e5129SAndreas Dilger 1364e50e5129SAndreas Dilger ret = ext4_map_blocks(handle, ea_inode, &map, 1365e50e5129SAndreas Dilger EXT4_GET_BLOCKS_CREATE); 1366e50e5129SAndreas Dilger if (ret <= 0) { 1367e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1368e50e5129SAndreas Dilger if (ret == -ENOSPC && 1369e50e5129SAndreas Dilger ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { 1370e50e5129SAndreas Dilger ret = 0; 1371e50e5129SAndreas Dilger goto retry; 1372e50e5129SAndreas Dilger } 1373e50e5129SAndreas Dilger break; 1374e50e5129SAndreas Dilger } 1375e50e5129SAndreas Dilger } 1376e50e5129SAndreas Dilger 1377e50e5129SAndreas Dilger if (ret < 0) 1378e50e5129SAndreas Dilger return ret; 1379e50e5129SAndreas Dilger 1380e50e5129SAndreas Dilger block = 0; 1381e50e5129SAndreas Dilger while (wsize < bufsize) { 1382e50e5129SAndreas Dilger if (bh != NULL) 1383e50e5129SAndreas Dilger brelse(bh); 1384e50e5129SAndreas Dilger csize = (bufsize - wsize) > blocksize ? blocksize : 1385e50e5129SAndreas Dilger bufsize - wsize; 1386e50e5129SAndreas Dilger bh = ext4_getblk(handle, ea_inode, block, 0); 1387e50e5129SAndreas Dilger if (IS_ERR(bh)) 1388e50e5129SAndreas Dilger return PTR_ERR(bh); 1389e50e5129SAndreas Dilger ret = ext4_journal_get_write_access(handle, bh); 1390e50e5129SAndreas Dilger if (ret) 1391e50e5129SAndreas Dilger goto out; 1392e50e5129SAndreas Dilger 1393e50e5129SAndreas Dilger memcpy(bh->b_data, buf, csize); 1394e50e5129SAndreas Dilger set_buffer_uptodate(bh); 1395e50e5129SAndreas Dilger ext4_handle_dirty_metadata(handle, ea_inode, bh); 1396e50e5129SAndreas Dilger 1397e50e5129SAndreas Dilger buf += csize; 1398e50e5129SAndreas Dilger wsize += csize; 1399e50e5129SAndreas Dilger block += 1; 1400e50e5129SAndreas Dilger } 1401e50e5129SAndreas Dilger 1402e50e5129SAndreas Dilger inode_lock(ea_inode); 1403e50e5129SAndreas Dilger i_size_write(ea_inode, wsize); 1404e50e5129SAndreas Dilger ext4_update_i_disksize(ea_inode, wsize); 1405e50e5129SAndreas Dilger inode_unlock(ea_inode); 1406e50e5129SAndreas Dilger 1407e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1408e50e5129SAndreas Dilger 1409e50e5129SAndreas Dilger out: 1410e50e5129SAndreas Dilger brelse(bh); 1411e50e5129SAndreas Dilger 1412e50e5129SAndreas Dilger return ret; 1413e50e5129SAndreas Dilger } 1414e50e5129SAndreas Dilger 1415e50e5129SAndreas Dilger /* 1416e50e5129SAndreas Dilger * Create an inode to store the value of a large EA. 1417e50e5129SAndreas Dilger */ 1418e50e5129SAndreas Dilger static struct inode *ext4_xattr_inode_create(handle_t *handle, 1419dec214d0STahsin Erdogan struct inode *inode, u32 hash) 1420e50e5129SAndreas Dilger { 1421e50e5129SAndreas Dilger struct inode *ea_inode = NULL; 14229e1ba001STahsin Erdogan uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; 1423bd3b963bSTahsin Erdogan int err; 1424e50e5129SAndreas Dilger 1425e50e5129SAndreas Dilger /* 1426e50e5129SAndreas Dilger * Let the next inode be the goal, so we try and allocate the EA inode 1427e50e5129SAndreas Dilger * in the same group, or nearby one. 1428e50e5129SAndreas Dilger */ 1429e50e5129SAndreas Dilger ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, 14309e1ba001STahsin Erdogan S_IFREG | 0600, NULL, inode->i_ino + 1, owner, 14311b917ed8STahsin Erdogan EXT4_EA_INODE_FL); 1432e50e5129SAndreas Dilger if (!IS_ERR(ea_inode)) { 1433e50e5129SAndreas Dilger ea_inode->i_op = &ext4_file_inode_operations; 1434e50e5129SAndreas Dilger ea_inode->i_fop = &ext4_file_operations; 1435e50e5129SAndreas Dilger ext4_set_aops(ea_inode); 143633d201e0STahsin Erdogan ext4_xattr_inode_set_class(ea_inode); 1437e50e5129SAndreas Dilger unlock_new_inode(ea_inode); 1438dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, 1); 1439dec214d0STahsin Erdogan ext4_xattr_inode_set_hash(ea_inode, hash); 1440dec214d0STahsin Erdogan err = ext4_mark_inode_dirty(handle, ea_inode); 1441dec214d0STahsin Erdogan if (!err) 1442bd3b963bSTahsin Erdogan err = ext4_inode_attach_jinode(ea_inode); 1443bd3b963bSTahsin Erdogan if (err) { 1444bd3b963bSTahsin Erdogan iput(ea_inode); 1445bd3b963bSTahsin Erdogan return ERR_PTR(err); 1446bd3b963bSTahsin Erdogan } 1447dec214d0STahsin Erdogan 1448dec214d0STahsin Erdogan /* 1449dec214d0STahsin Erdogan * Xattr inodes are shared therefore quota charging is performed 1450dec214d0STahsin Erdogan * at a higher level. 1451dec214d0STahsin Erdogan */ 1452dec214d0STahsin Erdogan dquot_free_inode(ea_inode); 1453dec214d0STahsin Erdogan dquot_drop(ea_inode); 1454dec214d0STahsin Erdogan inode_lock(ea_inode); 1455dec214d0STahsin Erdogan ea_inode->i_flags |= S_NOQUOTA; 1456dec214d0STahsin Erdogan inode_unlock(ea_inode); 1457e50e5129SAndreas Dilger } 1458e50e5129SAndreas Dilger 1459e50e5129SAndreas Dilger return ea_inode; 1460e50e5129SAndreas Dilger } 1461e50e5129SAndreas Dilger 1462dec214d0STahsin Erdogan static struct inode * 1463dec214d0STahsin Erdogan ext4_xattr_inode_cache_find(struct inode *inode, const void *value, 1464dec214d0STahsin Erdogan size_t value_len, u32 hash) 1465e50e5129SAndreas Dilger { 1466dec214d0STahsin Erdogan struct inode *ea_inode; 1467dec214d0STahsin Erdogan struct mb_cache_entry *ce; 1468dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 1469dec214d0STahsin Erdogan void *ea_data; 1470e50e5129SAndreas Dilger 1471cdb7ee4cSTahsin Erdogan if (!ea_inode_cache) 1472cdb7ee4cSTahsin Erdogan return NULL; 1473cdb7ee4cSTahsin Erdogan 1474dec214d0STahsin Erdogan ce = mb_cache_entry_find_first(ea_inode_cache, hash); 1475dec214d0STahsin Erdogan if (!ce) 1476dec214d0STahsin Erdogan return NULL; 1477e50e5129SAndreas Dilger 1478dec214d0STahsin Erdogan ea_data = ext4_kvmalloc(value_len, GFP_NOFS); 1479dec214d0STahsin Erdogan if (!ea_data) { 1480dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1481dec214d0STahsin Erdogan return NULL; 1482dec214d0STahsin Erdogan } 1483dec214d0STahsin Erdogan 1484dec214d0STahsin Erdogan while (ce) { 1485dec214d0STahsin Erdogan ea_inode = ext4_iget(inode->i_sb, ce->e_value); 1486dec214d0STahsin Erdogan if (!IS_ERR(ea_inode) && 1487dec214d0STahsin Erdogan !is_bad_inode(ea_inode) && 1488dec214d0STahsin Erdogan (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && 1489dec214d0STahsin Erdogan i_size_read(ea_inode) == value_len && 1490dec214d0STahsin Erdogan !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && 1491b9fc761eSTahsin Erdogan !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, 1492dec214d0STahsin Erdogan value_len) && 1493dec214d0STahsin Erdogan !memcmp(value, ea_data, value_len)) { 1494dec214d0STahsin Erdogan mb_cache_entry_touch(ea_inode_cache, ce); 1495dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1496dec214d0STahsin Erdogan kvfree(ea_data); 1497dec214d0STahsin Erdogan return ea_inode; 1498dec214d0STahsin Erdogan } 1499dec214d0STahsin Erdogan 1500dec214d0STahsin Erdogan if (!IS_ERR(ea_inode)) 1501e50e5129SAndreas Dilger iput(ea_inode); 1502dec214d0STahsin Erdogan ce = mb_cache_entry_find_next(ea_inode_cache, ce); 1503dec214d0STahsin Erdogan } 1504dec214d0STahsin Erdogan kvfree(ea_data); 1505dec214d0STahsin Erdogan return NULL; 1506e50e5129SAndreas Dilger } 1507e50e5129SAndreas Dilger 1508e50e5129SAndreas Dilger /* 1509e50e5129SAndreas Dilger * Add value of the EA in an inode. 1510e50e5129SAndreas Dilger */ 1511dec214d0STahsin Erdogan static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, 1512dec214d0STahsin Erdogan const void *value, size_t value_len, 1513dec214d0STahsin Erdogan struct inode **ret_inode) 1514e50e5129SAndreas Dilger { 1515e50e5129SAndreas Dilger struct inode *ea_inode; 1516dec214d0STahsin Erdogan u32 hash; 1517e50e5129SAndreas Dilger int err; 1518e50e5129SAndreas Dilger 1519dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); 1520dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); 1521dec214d0STahsin Erdogan if (ea_inode) { 1522dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1523dec214d0STahsin Erdogan if (err) { 1524dec214d0STahsin Erdogan iput(ea_inode); 1525dec214d0STahsin Erdogan return err; 1526dec214d0STahsin Erdogan } 1527dec214d0STahsin Erdogan 1528dec214d0STahsin Erdogan *ret_inode = ea_inode; 1529dec214d0STahsin Erdogan return 0; 1530dec214d0STahsin Erdogan } 1531dec214d0STahsin Erdogan 1532e50e5129SAndreas Dilger /* Create an inode for the EA value */ 1533dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_create(handle, inode, hash); 1534e50e5129SAndreas Dilger if (IS_ERR(ea_inode)) 1535e50e5129SAndreas Dilger return PTR_ERR(ea_inode); 1536e50e5129SAndreas Dilger 1537e50e5129SAndreas Dilger err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); 1538dec214d0STahsin Erdogan if (err) { 1539dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref(handle, ea_inode); 1540e50e5129SAndreas Dilger iput(ea_inode); 1541e50e5129SAndreas Dilger return err; 1542e50e5129SAndreas Dilger } 1543e50e5129SAndreas Dilger 1544cdb7ee4cSTahsin Erdogan if (EA_INODE_CACHE(inode)) 1545dec214d0STahsin Erdogan mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, 1546dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 1547dec214d0STahsin Erdogan 1548dec214d0STahsin Erdogan *ret_inode = ea_inode; 1549dec214d0STahsin Erdogan return 0; 1550dec214d0STahsin Erdogan } 1551dec214d0STahsin Erdogan 15529c6e7853STahsin Erdogan /* 15539c6e7853STahsin Erdogan * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode 15549c6e7853STahsin Erdogan * feature is enabled. 15559c6e7853STahsin Erdogan */ 15569c6e7853STahsin Erdogan #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) 15579c6e7853STahsin Erdogan 1558e50e5129SAndreas Dilger static int ext4_xattr_set_entry(struct ext4_xattr_info *i, 1559e50e5129SAndreas Dilger struct ext4_xattr_search *s, 1560daf83281STahsin Erdogan handle_t *handle, struct inode *inode, 1561daf83281STahsin Erdogan bool is_block) 1562ac27a0ecSDave Kleikamp { 1563617ba13bSMingming Cao struct ext4_xattr_entry *last; 1564dec214d0STahsin Erdogan struct ext4_xattr_entry *here = s->here; 1565dec214d0STahsin Erdogan size_t min_offs = s->end - s->base, name_len = strlen(i->name); 1566e50e5129SAndreas Dilger int in_inode = i->in_inode; 1567dec214d0STahsin Erdogan struct inode *old_ea_inode = NULL; 1568dec214d0STahsin Erdogan struct inode *new_ea_inode = NULL; 1569dec214d0STahsin Erdogan size_t old_size, new_size; 1570dec214d0STahsin Erdogan int ret; 1571dec214d0STahsin Erdogan 1572dec214d0STahsin Erdogan /* Space used by old and new values. */ 1573dec214d0STahsin Erdogan old_size = (!s->not_found && !here->e_value_inum) ? 1574dec214d0STahsin Erdogan EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; 1575dec214d0STahsin Erdogan new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; 1576dec214d0STahsin Erdogan 1577dec214d0STahsin Erdogan /* 1578dec214d0STahsin Erdogan * Optimization for the simple case when old and new values have the 1579dec214d0STahsin Erdogan * same padded sizes. Not applicable if external inodes are involved. 1580dec214d0STahsin Erdogan */ 1581dec214d0STahsin Erdogan if (new_size && new_size == old_size) { 1582dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1583dec214d0STahsin Erdogan void *val = s->base + offs; 1584dec214d0STahsin Erdogan 1585dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1586dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1587dec214d0STahsin Erdogan memset(val, 0, new_size); 1588dec214d0STahsin Erdogan } else { 1589dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1590dec214d0STahsin Erdogan /* Clear padding bytes. */ 1591dec214d0STahsin Erdogan memset(val + i->value_len, 0, new_size - i->value_len); 1592dec214d0STahsin Erdogan } 159332aaf194STahsin Erdogan goto update_hash; 1594dec214d0STahsin Erdogan } 1595e50e5129SAndreas Dilger 1596ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 1597ac27a0ecSDave Kleikamp last = s->first; 1598617ba13bSMingming Cao for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1599e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 1600ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 1601ac27a0ecSDave Kleikamp if (offs < min_offs) 1602ac27a0ecSDave Kleikamp min_offs = offs; 1603ac27a0ecSDave Kleikamp } 1604ac27a0ecSDave Kleikamp } 1605dec214d0STahsin Erdogan 1606dec214d0STahsin Erdogan /* Check whether we have enough space. */ 1607ac27a0ecSDave Kleikamp if (i->value) { 1608dec214d0STahsin Erdogan size_t free; 1609e50e5129SAndreas Dilger 1610dec214d0STahsin Erdogan free = min_offs - ((void *)last - s->base) - sizeof(__u32); 1611dec214d0STahsin Erdogan if (!s->not_found) 1612dec214d0STahsin Erdogan free += EXT4_XATTR_LEN(name_len) + old_size; 1613e50e5129SAndreas Dilger 1614dec214d0STahsin Erdogan if (free < EXT4_XATTR_LEN(name_len) + new_size) { 1615dec214d0STahsin Erdogan ret = -ENOSPC; 1616dec214d0STahsin Erdogan goto out; 1617dec214d0STahsin Erdogan } 16189c6e7853STahsin Erdogan 16199c6e7853STahsin Erdogan /* 16209c6e7853STahsin Erdogan * If storing the value in an external inode is an option, 16219c6e7853STahsin Erdogan * reserve space for xattr entries/names in the external 16229c6e7853STahsin Erdogan * attribute block so that a long value does not occupy the 16239c6e7853STahsin Erdogan * whole space and prevent futher entries being added. 16249c6e7853STahsin Erdogan */ 1625daf83281STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 1626daf83281STahsin Erdogan new_size && is_block && 16279c6e7853STahsin Erdogan (min_offs + old_size - new_size) < 16289c6e7853STahsin Erdogan EXT4_XATTR_BLOCK_RESERVE(inode)) { 16299c6e7853STahsin Erdogan ret = -ENOSPC; 16309c6e7853STahsin Erdogan goto out; 16319c6e7853STahsin Erdogan } 1632ac27a0ecSDave Kleikamp } 1633ac27a0ecSDave Kleikamp 1634dec214d0STahsin Erdogan /* 1635dec214d0STahsin Erdogan * Getting access to old and new ea inodes is subject to failures. 1636dec214d0STahsin Erdogan * Finish that work before doing any modifications to the xattr data. 1637dec214d0STahsin Erdogan */ 1638dec214d0STahsin Erdogan if (!s->not_found && here->e_value_inum) { 1639dec214d0STahsin Erdogan ret = ext4_xattr_inode_iget(inode, 1640dec214d0STahsin Erdogan le32_to_cpu(here->e_value_inum), 1641a6d05676STahsin Erdogan le32_to_cpu(here->e_hash), 1642dec214d0STahsin Erdogan &old_ea_inode); 1643dec214d0STahsin Erdogan if (ret) { 1644dec214d0STahsin Erdogan old_ea_inode = NULL; 1645dec214d0STahsin Erdogan goto out; 1646bd9926e8STheodore Ts'o } 1647dec214d0STahsin Erdogan } 1648dec214d0STahsin Erdogan if (i->value && in_inode) { 1649dec214d0STahsin Erdogan WARN_ON_ONCE(!i->value_len); 1650dec214d0STahsin Erdogan 1651dec214d0STahsin Erdogan ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); 1652dec214d0STahsin Erdogan if (ret) 1653dec214d0STahsin Erdogan goto out; 1654dec214d0STahsin Erdogan 1655dec214d0STahsin Erdogan ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, 1656dec214d0STahsin Erdogan i->value_len, 1657dec214d0STahsin Erdogan &new_ea_inode); 1658dec214d0STahsin Erdogan if (ret) { 1659dec214d0STahsin Erdogan new_ea_inode = NULL; 1660a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, NULL, i->value_len); 1661dec214d0STahsin Erdogan goto out; 1662dec214d0STahsin Erdogan } 1663ac27a0ecSDave Kleikamp } 1664ac27a0ecSDave Kleikamp 1665dec214d0STahsin Erdogan if (old_ea_inode) { 1666dec214d0STahsin Erdogan /* We are ready to release ref count on the old_ea_inode. */ 1667dec214d0STahsin Erdogan ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); 1668dec214d0STahsin Erdogan if (ret) { 1669dec214d0STahsin Erdogan /* Release newly required ref count on new_ea_inode. */ 1670dec214d0STahsin Erdogan if (new_ea_inode) { 1671dec214d0STahsin Erdogan int err; 1672dec214d0STahsin Erdogan 1673dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, 1674dec214d0STahsin Erdogan new_ea_inode); 1675dec214d0STahsin Erdogan if (err) 1676dec214d0STahsin Erdogan ext4_warning_inode(new_ea_inode, 1677dec214d0STahsin Erdogan "dec ref new_ea_inode err=%d", 1678dec214d0STahsin Erdogan err); 1679a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, new_ea_inode, 1680dec214d0STahsin Erdogan i->value_len); 1681dec214d0STahsin Erdogan } 1682dec214d0STahsin Erdogan goto out; 1683dec214d0STahsin Erdogan } 1684dec214d0STahsin Erdogan 1685a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, old_ea_inode, 1686dec214d0STahsin Erdogan le32_to_cpu(here->e_value_size)); 1687dec214d0STahsin Erdogan } 1688dec214d0STahsin Erdogan 1689dec214d0STahsin Erdogan /* No failures allowed past this point. */ 1690dec214d0STahsin Erdogan 1691dec214d0STahsin Erdogan if (!s->not_found && here->e_value_offs) { 1692ac27a0ecSDave Kleikamp /* Remove the old value. */ 1693dec214d0STahsin Erdogan void *first_val = s->base + min_offs; 1694dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1695dec214d0STahsin Erdogan void *val = s->base + offs; 1696dec214d0STahsin Erdogan 1697dec214d0STahsin Erdogan memmove(first_val + old_size, first_val, val - first_val); 1698dec214d0STahsin Erdogan memset(first_val, 0, old_size); 1699dec214d0STahsin Erdogan min_offs += old_size; 1700ac27a0ecSDave Kleikamp 1701ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 1702ac27a0ecSDave Kleikamp last = s->first; 1703ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 1704ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 1705dec214d0STahsin Erdogan 1706e50e5129SAndreas Dilger if (!last->e_value_inum && 1707e50e5129SAndreas Dilger last->e_value_size && o < offs) 1708dec214d0STahsin Erdogan last->e_value_offs = cpu_to_le16(o + old_size); 1709617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 1710ac27a0ecSDave Kleikamp } 1711ac27a0ecSDave Kleikamp } 1712dec214d0STahsin Erdogan 1713ac27a0ecSDave Kleikamp if (!i->value) { 1714dec214d0STahsin Erdogan /* Remove old name. */ 1715617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 1716dec214d0STahsin Erdogan 1717ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 1718dec214d0STahsin Erdogan memmove(here, (void *)here + size, 1719dec214d0STahsin Erdogan (void *)last - (void *)here + sizeof(__u32)); 1720ac27a0ecSDave Kleikamp memset(last, 0, size); 1721dec214d0STahsin Erdogan } else if (s->not_found) { 1722dec214d0STahsin Erdogan /* Insert new name. */ 1723dec214d0STahsin Erdogan size_t size = EXT4_XATTR_LEN(name_len); 1724dec214d0STahsin Erdogan size_t rest = (void *)last - (void *)here + sizeof(__u32); 1725dec214d0STahsin Erdogan 1726dec214d0STahsin Erdogan memmove((void *)here + size, here, rest); 1727dec214d0STahsin Erdogan memset(here, 0, size); 1728dec214d0STahsin Erdogan here->e_name_index = i->name_index; 1729dec214d0STahsin Erdogan here->e_name_len = name_len; 1730dec214d0STahsin Erdogan memcpy(here->e_name, i->name, name_len); 1731dec214d0STahsin Erdogan } else { 1732dec214d0STahsin Erdogan /* This is an update, reset value info. */ 1733dec214d0STahsin Erdogan here->e_value_inum = 0; 1734dec214d0STahsin Erdogan here->e_value_offs = 0; 1735dec214d0STahsin Erdogan here->e_value_size = 0; 1736ac27a0ecSDave Kleikamp } 1737ac27a0ecSDave Kleikamp 1738ac27a0ecSDave Kleikamp if (i->value) { 1739dec214d0STahsin Erdogan /* Insert new value. */ 1740e50e5129SAndreas Dilger if (in_inode) { 1741dec214d0STahsin Erdogan here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); 1742e50e5129SAndreas Dilger } else if (i->value_len) { 1743dec214d0STahsin Erdogan void *val = s->base + min_offs - new_size; 1744e50e5129SAndreas Dilger 1745dec214d0STahsin Erdogan here->e_value_offs = cpu_to_le16(min_offs - new_size); 1746dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1747dec214d0STahsin Erdogan memset(val, 0, new_size); 1748dec214d0STahsin Erdogan } else { 1749dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1750dec214d0STahsin Erdogan /* Clear padding bytes. */ 1751dec214d0STahsin Erdogan memset(val + i->value_len, 0, 1752dec214d0STahsin Erdogan new_size - i->value_len); 1753dec214d0STahsin Erdogan } 1754dec214d0STahsin Erdogan } 1755dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1756dec214d0STahsin Erdogan } 1757daf83281STahsin Erdogan 175832aaf194STahsin Erdogan update_hash: 1759b9fc761eSTahsin Erdogan if (i->value) { 1760b9fc761eSTahsin Erdogan __le32 hash = 0; 1761b9fc761eSTahsin Erdogan 1762b9fc761eSTahsin Erdogan /* Entry hash calculation. */ 1763b9fc761eSTahsin Erdogan if (in_inode) { 1764b9fc761eSTahsin Erdogan __le32 crc32c_hash; 1765b9fc761eSTahsin Erdogan 1766b9fc761eSTahsin Erdogan /* 1767b9fc761eSTahsin Erdogan * Feed crc32c hash instead of the raw value for entry 1768b9fc761eSTahsin Erdogan * hash calculation. This is to avoid walking 1769b9fc761eSTahsin Erdogan * potentially long value buffer again. 1770b9fc761eSTahsin Erdogan */ 1771b9fc761eSTahsin Erdogan crc32c_hash = cpu_to_le32( 1772b9fc761eSTahsin Erdogan ext4_xattr_inode_get_hash(new_ea_inode)); 1773b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1774b9fc761eSTahsin Erdogan here->e_name_len, 1775b9fc761eSTahsin Erdogan &crc32c_hash, 1); 1776b9fc761eSTahsin Erdogan } else if (is_block) { 177732aaf194STahsin Erdogan __le32 *value = s->base + le16_to_cpu( 177832aaf194STahsin Erdogan here->e_value_offs); 1779b9fc761eSTahsin Erdogan 1780b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1781b9fc761eSTahsin Erdogan here->e_name_len, value, 1782b9fc761eSTahsin Erdogan new_size >> 2); 1783daf83281STahsin Erdogan } 1784b9fc761eSTahsin Erdogan here->e_hash = hash; 1785b9fc761eSTahsin Erdogan } 1786b9fc761eSTahsin Erdogan 1787b9fc761eSTahsin Erdogan if (is_block) 1788b9fc761eSTahsin Erdogan ext4_xattr_rehash((struct ext4_xattr_header *)s->base); 1789daf83281STahsin Erdogan 1790dec214d0STahsin Erdogan ret = 0; 1791e50e5129SAndreas Dilger out: 1792dec214d0STahsin Erdogan iput(old_ea_inode); 1793dec214d0STahsin Erdogan iput(new_ea_inode); 1794dec214d0STahsin Erdogan return ret; 1795ac27a0ecSDave Kleikamp } 1796ac27a0ecSDave Kleikamp 1797617ba13bSMingming Cao struct ext4_xattr_block_find { 1798617ba13bSMingming Cao struct ext4_xattr_search s; 1799ac27a0ecSDave Kleikamp struct buffer_head *bh; 1800ac27a0ecSDave Kleikamp }; 1801ac27a0ecSDave Kleikamp 1802ac27a0ecSDave Kleikamp static int 1803617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 1804617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1805ac27a0ecSDave Kleikamp { 1806ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1807ac27a0ecSDave Kleikamp int error; 1808ac27a0ecSDave Kleikamp 1809ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 1810ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 1811ac27a0ecSDave Kleikamp 1812617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 1813ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 1814617ba13bSMingming Cao bs->bh = sb_bread(sb, EXT4_I(inode)->i_file_acl); 1815ac27a0ecSDave Kleikamp error = -EIO; 1816ac27a0ecSDave Kleikamp if (!bs->bh) 1817ac27a0ecSDave Kleikamp goto cleanup; 1818ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 1819ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 1820ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 1821de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bs->bh); 1822de05ca85STheodore Ts'o if (error) 1823ac27a0ecSDave Kleikamp goto cleanup; 1824ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1825ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 1826ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 1827ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 1828ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 18299496005dSTheodore Ts'o error = xattr_find_entry(inode, &bs->s.here, bs->s.end, 18309496005dSTheodore Ts'o i->name_index, i->name, 1); 1831ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1832ac27a0ecSDave Kleikamp goto cleanup; 1833ac27a0ecSDave Kleikamp bs->s.not_found = error; 1834ac27a0ecSDave Kleikamp } 1835ac27a0ecSDave Kleikamp error = 0; 1836ac27a0ecSDave Kleikamp 1837ac27a0ecSDave Kleikamp cleanup: 1838ac27a0ecSDave Kleikamp return error; 1839ac27a0ecSDave Kleikamp } 1840ac27a0ecSDave Kleikamp 1841ac27a0ecSDave Kleikamp static int 1842617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 1843617ba13bSMingming Cao struct ext4_xattr_info *i, 1844617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1845ac27a0ecSDave Kleikamp { 1846ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1847ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 1848b347e2bcSTahsin Erdogan struct ext4_xattr_search s_copy = bs->s; 1849b347e2bcSTahsin Erdogan struct ext4_xattr_search *s = &s_copy; 18507a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 18518a2bfdcbSMingming Cao int error = 0; 185247387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 1853a6d05676STahsin Erdogan struct inode *ea_inode = NULL, *tmp_inode; 1854a6d05676STahsin Erdogan size_t old_ea_inode_quota = 0; 1855a6d05676STahsin Erdogan unsigned int ea_ino; 1856a6d05676STahsin Erdogan 1857ac27a0ecSDave Kleikamp 1858617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 1859ac27a0ecSDave Kleikamp 1860ac27a0ecSDave Kleikamp if (s->base) { 18615d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 18628a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 18638a2bfdcbSMingming Cao if (error) 18648a2bfdcbSMingming Cao goto cleanup; 18658a2bfdcbSMingming Cao lock_buffer(bs->bh); 18668a2bfdcbSMingming Cao 1867ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 186882939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 186982939d79SJan Kara 187082939d79SJan Kara /* 187182939d79SJan Kara * This must happen under buffer lock for 187282939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 187382939d79SJan Kara * block 187482939d79SJan Kara */ 1875cdb7ee4cSTahsin Erdogan if (ea_block_cache) 187647387409STahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, 187782939d79SJan Kara bs->bh->b_blocknr); 1878ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 1879daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 1880daf83281STahsin Erdogan true /* is_block */); 1881dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bs->bh); 1882ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 18836a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1884ac27a0ecSDave Kleikamp goto bad_block; 1885ac27a0ecSDave Kleikamp if (!error) 1886dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 18870390131bSFrank Mayhar inode, 1888ac27a0ecSDave Kleikamp bs->bh); 1889ac27a0ecSDave Kleikamp if (error) 1890ac27a0ecSDave Kleikamp goto cleanup; 1891ac27a0ecSDave Kleikamp goto inserted; 1892ac27a0ecSDave Kleikamp } else { 1893ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 1894ac27a0ecSDave Kleikamp 18958a2bfdcbSMingming Cao unlock_buffer(bs->bh); 1896ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 1897216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 1898ac27a0ecSDave Kleikamp error = -ENOMEM; 1899ac27a0ecSDave Kleikamp if (s->base == NULL) 1900ac27a0ecSDave Kleikamp goto cleanup; 1901ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 1902ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1903ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1904ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 1905ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 1906dec214d0STahsin Erdogan 1907dec214d0STahsin Erdogan /* 1908dec214d0STahsin Erdogan * If existing entry points to an xattr inode, we need 1909dec214d0STahsin Erdogan * to prevent ext4_xattr_set_entry() from decrementing 1910dec214d0STahsin Erdogan * ref count on it because the reference belongs to the 1911dec214d0STahsin Erdogan * original block. In this case, make the entry look 1912dec214d0STahsin Erdogan * like it has an empty value. 1913dec214d0STahsin Erdogan */ 1914dec214d0STahsin Erdogan if (!s->not_found && s->here->e_value_inum) { 1915a6d05676STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 1916a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, 1917a6d05676STahsin Erdogan le32_to_cpu(s->here->e_hash), 1918a6d05676STahsin Erdogan &tmp_inode); 1919a6d05676STahsin Erdogan if (error) 1920a6d05676STahsin Erdogan goto cleanup; 1921a6d05676STahsin Erdogan 1922a6d05676STahsin Erdogan if (!ext4_test_inode_state(tmp_inode, 1923a6d05676STahsin Erdogan EXT4_STATE_LUSTRE_EA_INODE)) { 1924dec214d0STahsin Erdogan /* 1925a6d05676STahsin Erdogan * Defer quota free call for previous 1926a6d05676STahsin Erdogan * inode until success is guaranteed. 1927dec214d0STahsin Erdogan */ 1928a6d05676STahsin Erdogan old_ea_inode_quota = le32_to_cpu( 1929dec214d0STahsin Erdogan s->here->e_value_size); 1930a6d05676STahsin Erdogan } 1931a6d05676STahsin Erdogan iput(tmp_inode); 1932a6d05676STahsin Erdogan 1933dec214d0STahsin Erdogan s->here->e_value_inum = 0; 1934dec214d0STahsin Erdogan s->here->e_value_size = 0; 1935dec214d0STahsin Erdogan } 1936ac27a0ecSDave Kleikamp } 1937ac27a0ecSDave Kleikamp } else { 1938ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 1939216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 1940ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 1941ac27a0ecSDave Kleikamp error = -ENOMEM; 1942ac27a0ecSDave Kleikamp if (s->base == NULL) 1943ac27a0ecSDave Kleikamp goto cleanup; 1944617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 1945ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 1946ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1947ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1948ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 1949ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 1950ac27a0ecSDave Kleikamp } 1951ac27a0ecSDave Kleikamp 1952daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); 19536a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1954ac27a0ecSDave Kleikamp goto bad_block; 1955ac27a0ecSDave Kleikamp if (error) 1956ac27a0ecSDave Kleikamp goto cleanup; 1957dec214d0STahsin Erdogan 1958dec214d0STahsin Erdogan if (i->value && s->here->e_value_inum) { 1959dec214d0STahsin Erdogan /* 1960dec214d0STahsin Erdogan * A ref count on ea_inode has been taken as part of the call to 1961dec214d0STahsin Erdogan * ext4_xattr_set_entry() above. We would like to drop this 1962dec214d0STahsin Erdogan * extra ref but we have to wait until the xattr block is 1963dec214d0STahsin Erdogan * initialized and has its own ref count on the ea_inode. 1964dec214d0STahsin Erdogan */ 1965dec214d0STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 1966a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, 1967a6d05676STahsin Erdogan le32_to_cpu(s->here->e_hash), 1968a6d05676STahsin Erdogan &ea_inode); 1969dec214d0STahsin Erdogan if (error) { 1970dec214d0STahsin Erdogan ea_inode = NULL; 1971dec214d0STahsin Erdogan goto cleanup; 1972dec214d0STahsin Erdogan } 1973dec214d0STahsin Erdogan } 1974dec214d0STahsin Erdogan 1975ac27a0ecSDave Kleikamp inserted: 1976ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 197747387409STahsin Erdogan new_bh = ext4_xattr_block_cache_find(inode, header(s->base), 197847387409STahsin Erdogan &ce); 1979ac27a0ecSDave Kleikamp if (new_bh) { 1980ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 1981ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 1982ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 1983ac27a0ecSDave Kleikamp else { 19846048c64bSAndreas Gruenbacher u32 ref; 19856048c64bSAndreas Gruenbacher 1986b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 1987b8cb5a54STahsin Erdogan 1988ac27a0ecSDave Kleikamp /* The old block is released after updating 1989ac27a0ecSDave Kleikamp the inode. */ 19901231b3a1SLukas Czerner error = dquot_alloc_block(inode, 19911231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 19925dd4056dSChristoph Hellwig if (error) 1993ac27a0ecSDave Kleikamp goto cleanup; 19945d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 1995617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 1996ac27a0ecSDave Kleikamp new_bh); 1997ac27a0ecSDave Kleikamp if (error) 1998ac27a0ecSDave Kleikamp goto cleanup_dquot; 1999ac27a0ecSDave Kleikamp lock_buffer(new_bh); 200082939d79SJan Kara /* 200182939d79SJan Kara * We have to be careful about races with 20026048c64bSAndreas Gruenbacher * freeing, rehashing or adding references to 20036048c64bSAndreas Gruenbacher * xattr block. Once we hold buffer lock xattr 20046048c64bSAndreas Gruenbacher * block's state is stable so we can check 20056048c64bSAndreas Gruenbacher * whether the block got freed / rehashed or 20066048c64bSAndreas Gruenbacher * not. Since we unhash mbcache entry under 20076048c64bSAndreas Gruenbacher * buffer lock when freeing / rehashing xattr 20086048c64bSAndreas Gruenbacher * block, checking whether entry is still 20096048c64bSAndreas Gruenbacher * hashed is reliable. Same rules hold for 20106048c64bSAndreas Gruenbacher * e_reusable handling. 201182939d79SJan Kara */ 20126048c64bSAndreas Gruenbacher if (hlist_bl_unhashed(&ce->e_hash_list) || 20136048c64bSAndreas Gruenbacher !ce->e_reusable) { 201482939d79SJan Kara /* 201582939d79SJan Kara * Undo everything and check mbcache 201682939d79SJan Kara * again. 201782939d79SJan Kara */ 201882939d79SJan Kara unlock_buffer(new_bh); 201982939d79SJan Kara dquot_free_block(inode, 202082939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 202182939d79SJan Kara 1)); 202282939d79SJan Kara brelse(new_bh); 202347387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 202482939d79SJan Kara ce = NULL; 202582939d79SJan Kara new_bh = NULL; 202682939d79SJan Kara goto inserted; 202782939d79SJan Kara } 20286048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 20296048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 20306048c64bSAndreas Gruenbacher if (ref >= EXT4_XATTR_REFCOUNT_MAX) 20316048c64bSAndreas Gruenbacher ce->e_reusable = 0; 2032ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 20336048c64bSAndreas Gruenbacher ref); 2034dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2035ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2036dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 20370390131bSFrank Mayhar inode, 2038ac27a0ecSDave Kleikamp new_bh); 2039ac27a0ecSDave Kleikamp if (error) 2040ac27a0ecSDave Kleikamp goto cleanup_dquot; 2041ac27a0ecSDave Kleikamp } 204247387409STahsin Erdogan mb_cache_entry_touch(ea_block_cache, ce); 204347387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2044ac27a0ecSDave Kleikamp ce = NULL; 2045ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 2046ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 2047ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 2048ec000220STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); 2049ac27a0ecSDave Kleikamp new_bh = bs->bh; 2050ac27a0ecSDave Kleikamp get_bh(new_bh); 2051ac27a0ecSDave Kleikamp } else { 2052ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 2053fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 2054fb0a387dSEric Sandeen 2055b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 2056b8cb5a54STahsin Erdogan 2057fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 2058d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 2059fb0a387dSEric Sandeen 2060fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 206112e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 2062fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 2063fb0a387dSEric Sandeen 206455f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 206555f020dbSAllison Henderson NULL, &error); 2066ac27a0ecSDave Kleikamp if (error) 2067ac27a0ecSDave Kleikamp goto cleanup; 2068fb0a387dSEric Sandeen 206912e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 2070fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 2071fb0a387dSEric Sandeen 2072ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 2073ace36ad4SJoe Perches (unsigned long long)block); 2074ac27a0ecSDave Kleikamp 2075ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 2076aebf0243SWang Shilong if (unlikely(!new_bh)) { 2077860d21e2STheodore Ts'o error = -ENOMEM; 2078ac27a0ecSDave Kleikamp getblk_failed: 20797dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 2080e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 2081ac27a0ecSDave Kleikamp goto cleanup; 2082ac27a0ecSDave Kleikamp } 2083dec214d0STahsin Erdogan error = ext4_xattr_inode_inc_ref_all(handle, inode, 2084dec214d0STahsin Erdogan ENTRY(header(s->base)+1)); 2085dec214d0STahsin Erdogan if (error) 2086dec214d0STahsin Erdogan goto getblk_failed; 2087dec214d0STahsin Erdogan if (ea_inode) { 2088dec214d0STahsin Erdogan /* Drop the extra ref on ea_inode. */ 2089dec214d0STahsin Erdogan error = ext4_xattr_inode_dec_ref(handle, 2090dec214d0STahsin Erdogan ea_inode); 2091dec214d0STahsin Erdogan if (error) 2092dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 2093dec214d0STahsin Erdogan "dec ref error=%d", 2094dec214d0STahsin Erdogan error); 2095dec214d0STahsin Erdogan iput(ea_inode); 2096dec214d0STahsin Erdogan ea_inode = NULL; 2097dec214d0STahsin Erdogan } 2098dec214d0STahsin Erdogan 2099ac27a0ecSDave Kleikamp lock_buffer(new_bh); 2100617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 2101ac27a0ecSDave Kleikamp if (error) { 2102ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2103860d21e2STheodore Ts'o error = -EIO; 2104ac27a0ecSDave Kleikamp goto getblk_failed; 2105ac27a0ecSDave Kleikamp } 2106ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 2107dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2108ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 2109ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 211047387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, new_bh); 2111dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, 2112dac7a4b4STheodore Ts'o new_bh); 2113ac27a0ecSDave Kleikamp if (error) 2114ac27a0ecSDave Kleikamp goto cleanup; 2115ac27a0ecSDave Kleikamp } 2116ac27a0ecSDave Kleikamp } 2117ac27a0ecSDave Kleikamp 2118a6d05676STahsin Erdogan if (old_ea_inode_quota) 2119a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, NULL, old_ea_inode_quota); 2120dec214d0STahsin Erdogan 2121ac27a0ecSDave Kleikamp /* Update the inode. */ 2122617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 2123ac27a0ecSDave Kleikamp 2124ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 2125dec214d0STahsin Erdogan if (bs->bh && bs->bh != new_bh) { 2126dec214d0STahsin Erdogan struct ext4_xattr_inode_array *ea_inode_array = NULL; 2127dec214d0STahsin Erdogan 2128dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bs->bh, 2129dec214d0STahsin Erdogan &ea_inode_array, 2130dec214d0STahsin Erdogan 0 /* extra_credits */); 2131dec214d0STahsin Erdogan ext4_xattr_inode_array_free(ea_inode_array); 2132dec214d0STahsin Erdogan } 2133ac27a0ecSDave Kleikamp error = 0; 2134ac27a0ecSDave Kleikamp 2135ac27a0ecSDave Kleikamp cleanup: 2136dec214d0STahsin Erdogan if (ea_inode) { 2137dec214d0STahsin Erdogan int error2; 2138dec214d0STahsin Erdogan 2139dec214d0STahsin Erdogan error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); 2140dec214d0STahsin Erdogan if (error2) 2141dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "dec ref error=%d", 2142dec214d0STahsin Erdogan error2); 2143dec214d0STahsin Erdogan 2144dec214d0STahsin Erdogan /* If there was an error, revert the quota charge. */ 2145dec214d0STahsin Erdogan if (error) 2146a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, ea_inode, 2147dec214d0STahsin Erdogan i_size_read(ea_inode)); 2148dec214d0STahsin Erdogan iput(ea_inode); 2149dec214d0STahsin Erdogan } 2150ac27a0ecSDave Kleikamp if (ce) 215147387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2152ac27a0ecSDave Kleikamp brelse(new_bh); 2153ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 2154ac27a0ecSDave Kleikamp kfree(s->base); 2155ac27a0ecSDave Kleikamp 2156ac27a0ecSDave Kleikamp return error; 2157ac27a0ecSDave Kleikamp 2158ac27a0ecSDave Kleikamp cleanup_dquot: 21591231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 2160ac27a0ecSDave Kleikamp goto cleanup; 2161ac27a0ecSDave Kleikamp 2162ac27a0ecSDave Kleikamp bad_block: 216324676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 216424676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2165ac27a0ecSDave Kleikamp goto cleanup; 2166ac27a0ecSDave Kleikamp 2167ac27a0ecSDave Kleikamp #undef header 2168ac27a0ecSDave Kleikamp } 2169ac27a0ecSDave Kleikamp 2170879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 2171617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2172ac27a0ecSDave Kleikamp { 2173617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2174617ba13bSMingming Cao struct ext4_inode *raw_inode; 2175ac27a0ecSDave Kleikamp int error; 2176ac27a0ecSDave Kleikamp 2177617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 2178ac27a0ecSDave Kleikamp return 0; 2179617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 2180ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 2181ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 2182ac27a0ecSDave Kleikamp is->s.here = is->s.first; 2183617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 218419f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 21859e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 2186ac27a0ecSDave Kleikamp if (error) 2187ac27a0ecSDave Kleikamp return error; 2188ac27a0ecSDave Kleikamp /* Find the named attribute. */ 21899496005dSTheodore Ts'o error = xattr_find_entry(inode, &is->s.here, is->s.end, 21909496005dSTheodore Ts'o i->name_index, i->name, 0); 2191ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 2192ac27a0ecSDave Kleikamp return error; 2193ac27a0ecSDave Kleikamp is->s.not_found = error; 2194ac27a0ecSDave Kleikamp } 2195ac27a0ecSDave Kleikamp return 0; 2196ac27a0ecSDave Kleikamp } 2197ac27a0ecSDave Kleikamp 21980d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 21990d812f77STao Ma struct ext4_xattr_info *i, 22000d812f77STao Ma struct ext4_xattr_ibody_find *is) 22010d812f77STao Ma { 22020d812f77STao Ma struct ext4_xattr_ibody_header *header; 22030d812f77STao Ma struct ext4_xattr_search *s = &is->s; 22040d812f77STao Ma int error; 22050d812f77STao Ma 22060d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 22070d812f77STao Ma return -ENOSPC; 2208daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 22090d812f77STao Ma if (error) { 22100d812f77STao Ma if (error == -ENOSPC && 22110d812f77STao Ma ext4_has_inline_data(inode)) { 22120d812f77STao Ma error = ext4_try_to_evict_inline_data(handle, inode, 22130d812f77STao Ma EXT4_XATTR_LEN(strlen(i->name) + 22140d812f77STao Ma EXT4_XATTR_SIZE(i->value_len))); 22150d812f77STao Ma if (error) 22160d812f77STao Ma return error; 22170d812f77STao Ma error = ext4_xattr_ibody_find(inode, i, is); 22180d812f77STao Ma if (error) 22190d812f77STao Ma return error; 2220daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 2221daf83281STahsin Erdogan false /* is_block */); 22220d812f77STao Ma } 22230d812f77STao Ma if (error) 22240d812f77STao Ma return error; 22250d812f77STao Ma } 22260d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 22270d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 22280d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 22290d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 22300d812f77STao Ma } else { 22310d812f77STao Ma header->h_magic = cpu_to_le32(0); 22320d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 22330d812f77STao Ma } 22340d812f77STao Ma return 0; 22350d812f77STao Ma } 22360d812f77STao Ma 2237e50e5129SAndreas Dilger static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 2238617ba13bSMingming Cao struct ext4_xattr_info *i, 2239617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2240ac27a0ecSDave Kleikamp { 2241617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2242617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 2243ac27a0ecSDave Kleikamp int error; 2244ac27a0ecSDave Kleikamp 2245617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 2246ac27a0ecSDave Kleikamp return -ENOSPC; 2247daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 2248ac27a0ecSDave Kleikamp if (error) 2249ac27a0ecSDave Kleikamp return error; 2250617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 2251ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 2252617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 225319f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 2254ac27a0ecSDave Kleikamp } else { 2255ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 225619f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 2257ac27a0ecSDave Kleikamp } 2258ac27a0ecSDave Kleikamp return 0; 2259ac27a0ecSDave Kleikamp } 2260ac27a0ecSDave Kleikamp 22613fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 22623fd16462SJan Kara struct ext4_xattr_info *i) 22633fd16462SJan Kara { 22643fd16462SJan Kara void *value; 22653fd16462SJan Kara 22660bd454c0STahsin Erdogan /* When e_value_inum is set the value is stored externally. */ 22670bd454c0STahsin Erdogan if (s->here->e_value_inum) 22680bd454c0STahsin Erdogan return 0; 22693fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 22703fd16462SJan Kara return 0; 22713fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 22723fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 22733fd16462SJan Kara } 22743fd16462SJan Kara 2275dec214d0STahsin Erdogan static struct buffer_head *ext4_xattr_get_block(struct inode *inode) 2276dec214d0STahsin Erdogan { 2277dec214d0STahsin Erdogan struct buffer_head *bh; 2278dec214d0STahsin Erdogan int error; 2279dec214d0STahsin Erdogan 2280dec214d0STahsin Erdogan if (!EXT4_I(inode)->i_file_acl) 2281dec214d0STahsin Erdogan return NULL; 2282dec214d0STahsin Erdogan bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 2283dec214d0STahsin Erdogan if (!bh) 2284dec214d0STahsin Erdogan return ERR_PTR(-EIO); 2285dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2286dec214d0STahsin Erdogan if (error) 2287dec214d0STahsin Erdogan return ERR_PTR(error); 2288dec214d0STahsin Erdogan return bh; 2289dec214d0STahsin Erdogan } 2290dec214d0STahsin Erdogan 2291ac27a0ecSDave Kleikamp /* 2292617ba13bSMingming Cao * ext4_xattr_set_handle() 2293ac27a0ecSDave Kleikamp * 22946e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 2295ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 2296ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 2297ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 2298ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 2299ac27a0ecSDave Kleikamp * previous to the call, respectively. 2300ac27a0ecSDave Kleikamp * 2301ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2302ac27a0ecSDave Kleikamp */ 2303ac27a0ecSDave Kleikamp int 2304617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 2305ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 2306ac27a0ecSDave Kleikamp int flags) 2307ac27a0ecSDave Kleikamp { 2308617ba13bSMingming Cao struct ext4_xattr_info i = { 2309ac27a0ecSDave Kleikamp .name_index = name_index, 2310ac27a0ecSDave Kleikamp .name = name, 2311ac27a0ecSDave Kleikamp .value = value, 2312ac27a0ecSDave Kleikamp .value_len = value_len, 2313e50e5129SAndreas Dilger .in_inode = 0, 2314ac27a0ecSDave Kleikamp }; 2315617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 2316ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2317ac27a0ecSDave Kleikamp }; 2318617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 2319ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2320ac27a0ecSDave Kleikamp }; 2321c755e251STheodore Ts'o int no_expand; 2322ac27a0ecSDave Kleikamp int error; 2323ac27a0ecSDave Kleikamp 2324ac27a0ecSDave Kleikamp if (!name) 2325ac27a0ecSDave Kleikamp return -EINVAL; 2326ac27a0ecSDave Kleikamp if (strlen(name) > 255) 2327ac27a0ecSDave Kleikamp return -ERANGE; 2328b8cb5a54STahsin Erdogan 2329c755e251STheodore Ts'o ext4_write_lock_xattr(inode, &no_expand); 23304d20c685SKalpak Shah 2331c1a5d5f6STahsin Erdogan /* Check journal credits under write lock. */ 2332c1a5d5f6STahsin Erdogan if (ext4_handle_valid(handle)) { 2333dec214d0STahsin Erdogan struct buffer_head *bh; 2334c1a5d5f6STahsin Erdogan int credits; 2335c1a5d5f6STahsin Erdogan 2336dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2337dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2338dec214d0STahsin Erdogan error = PTR_ERR(bh); 2339dec214d0STahsin Erdogan goto cleanup; 2340dec214d0STahsin Erdogan } 2341dec214d0STahsin Erdogan 2342af65207cSTahsin Erdogan credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2343af65207cSTahsin Erdogan value_len, 2344af65207cSTahsin Erdogan flags & XATTR_CREATE); 2345dec214d0STahsin Erdogan brelse(bh); 2346dec214d0STahsin Erdogan 2347c1a5d5f6STahsin Erdogan if (!ext4_handle_has_enough_credits(handle, credits)) { 2348c1a5d5f6STahsin Erdogan error = -ENOSPC; 2349c1a5d5f6STahsin Erdogan goto cleanup; 2350c1a5d5f6STahsin Erdogan } 2351c1a5d5f6STahsin Erdogan } 2352c1a5d5f6STahsin Erdogan 235366543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 235486ebfd08SEric Sandeen if (error) 235586ebfd08SEric Sandeen goto cleanup; 235686ebfd08SEric Sandeen 235719f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 2358617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 2359617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 236019f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 2361ac27a0ecSDave Kleikamp } 2362ac27a0ecSDave Kleikamp 2363617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 2364ac27a0ecSDave Kleikamp if (error) 2365ac27a0ecSDave Kleikamp goto cleanup; 2366ac27a0ecSDave Kleikamp if (is.s.not_found) 2367617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 2368ac27a0ecSDave Kleikamp if (error) 2369ac27a0ecSDave Kleikamp goto cleanup; 2370ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 2371ac27a0ecSDave Kleikamp error = -ENODATA; 2372ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 2373ac27a0ecSDave Kleikamp goto cleanup; 2374ac27a0ecSDave Kleikamp error = 0; 2375ac27a0ecSDave Kleikamp if (!value) 2376ac27a0ecSDave Kleikamp goto cleanup; 2377ac27a0ecSDave Kleikamp } else { 2378ac27a0ecSDave Kleikamp error = -EEXIST; 2379ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 2380ac27a0ecSDave Kleikamp goto cleanup; 2381ac27a0ecSDave Kleikamp } 2382dec214d0STahsin Erdogan 2383ac27a0ecSDave Kleikamp if (!value) { 2384ac27a0ecSDave Kleikamp if (!is.s.not_found) 2385e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2386ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 2387617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2388ac27a0ecSDave Kleikamp } else { 23893fd16462SJan Kara error = 0; 23903fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 23913fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 23923fd16462SJan Kara goto cleanup; 23933fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 23943fd16462SJan Kara goto cleanup; 23953fd16462SJan Kara 2396b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2397b347e2bcSTahsin Erdogan (EXT4_XATTR_SIZE(i.value_len) > 2398b347e2bcSTahsin Erdogan EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) 2399b347e2bcSTahsin Erdogan i.in_inode = 1; 2400b347e2bcSTahsin Erdogan retry_inode: 2401e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2402ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 2403ac27a0ecSDave Kleikamp i.value = NULL; 2404617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2405ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 24067e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 24077e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 24087e01c8e5STiger Yang if (error) 24097e01c8e5STiger Yang goto cleanup; 24107e01c8e5STiger Yang } 2411617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2412b347e2bcSTahsin Erdogan if (!error && !is.s.not_found) { 2413ac27a0ecSDave Kleikamp i.value = NULL; 2414e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, 2415e50e5129SAndreas Dilger &is); 2416b347e2bcSTahsin Erdogan } else if (error == -ENOSPC) { 2417b347e2bcSTahsin Erdogan /* 2418b347e2bcSTahsin Erdogan * Xattr does not fit in the block, store at 2419b347e2bcSTahsin Erdogan * external inode if possible. 2420b347e2bcSTahsin Erdogan */ 2421b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2422b347e2bcSTahsin Erdogan !i.in_inode) { 2423b347e2bcSTahsin Erdogan i.in_inode = 1; 2424b347e2bcSTahsin Erdogan goto retry_inode; 2425b347e2bcSTahsin Erdogan } 2426ac27a0ecSDave Kleikamp } 2427ac27a0ecSDave Kleikamp } 2428ac27a0ecSDave Kleikamp } 2429ac27a0ecSDave Kleikamp if (!error) { 2430617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 2431eeca7ea1SDeepa Dinamani inode->i_ctime = current_time(inode); 24326dd4ee7cSKalpak Shah if (!value) 2433c755e251STheodore Ts'o no_expand = 0; 2434617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 2435ac27a0ecSDave Kleikamp /* 2436617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 2437ac27a0ecSDave Kleikamp * error != 0. 2438ac27a0ecSDave Kleikamp */ 2439ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 2440ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 24410390131bSFrank Mayhar ext4_handle_sync(handle); 2442ac27a0ecSDave Kleikamp } 2443ac27a0ecSDave Kleikamp 2444ac27a0ecSDave Kleikamp cleanup: 2445ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 2446ac27a0ecSDave Kleikamp brelse(bs.bh); 2447c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 2448ac27a0ecSDave Kleikamp return error; 2449ac27a0ecSDave Kleikamp } 2450ac27a0ecSDave Kleikamp 2451af65207cSTahsin Erdogan int ext4_xattr_set_credits(struct inode *inode, size_t value_len, 2452af65207cSTahsin Erdogan bool is_create, int *credits) 2453c1a5d5f6STahsin Erdogan { 2454dec214d0STahsin Erdogan struct buffer_head *bh; 2455dec214d0STahsin Erdogan int err; 2456c1a5d5f6STahsin Erdogan 2457dec214d0STahsin Erdogan *credits = 0; 2458dec214d0STahsin Erdogan 2459dec214d0STahsin Erdogan if (!EXT4_SB(inode->i_sb)->s_journal) 2460c1a5d5f6STahsin Erdogan return 0; 2461c1a5d5f6STahsin Erdogan 2462dec214d0STahsin Erdogan down_read(&EXT4_I(inode)->xattr_sem); 2463c1a5d5f6STahsin Erdogan 2464dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2465dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2466dec214d0STahsin Erdogan err = PTR_ERR(bh); 2467dec214d0STahsin Erdogan } else { 2468af65207cSTahsin Erdogan *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2469af65207cSTahsin Erdogan value_len, is_create); 2470dec214d0STahsin Erdogan brelse(bh); 2471dec214d0STahsin Erdogan err = 0; 2472c1a5d5f6STahsin Erdogan } 2473dec214d0STahsin Erdogan 2474dec214d0STahsin Erdogan up_read(&EXT4_I(inode)->xattr_sem); 2475dec214d0STahsin Erdogan return err; 2476c1a5d5f6STahsin Erdogan } 2477c1a5d5f6STahsin Erdogan 2478ac27a0ecSDave Kleikamp /* 2479617ba13bSMingming Cao * ext4_xattr_set() 2480ac27a0ecSDave Kleikamp * 2481617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 2482ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 2483ac27a0ecSDave Kleikamp * 2484ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2485ac27a0ecSDave Kleikamp */ 2486ac27a0ecSDave Kleikamp int 2487617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 2488ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 2489ac27a0ecSDave Kleikamp { 2490ac27a0ecSDave Kleikamp handle_t *handle; 2491e50e5129SAndreas Dilger struct super_block *sb = inode->i_sb; 2492ac27a0ecSDave Kleikamp int error, retries = 0; 2493c1a5d5f6STahsin Erdogan int credits; 2494ac27a0ecSDave Kleikamp 2495b8cb5a54STahsin Erdogan error = dquot_initialize(inode); 2496b8cb5a54STahsin Erdogan if (error) 2497b8cb5a54STahsin Erdogan return error; 2498e50e5129SAndreas Dilger 2499ac27a0ecSDave Kleikamp retry: 2500af65207cSTahsin Erdogan error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, 2501af65207cSTahsin Erdogan &credits); 2502dec214d0STahsin Erdogan if (error) 2503dec214d0STahsin Erdogan return error; 2504dec214d0STahsin Erdogan 25059924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 2506ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 2507ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 2508ac27a0ecSDave Kleikamp } else { 2509ac27a0ecSDave Kleikamp int error2; 2510ac27a0ecSDave Kleikamp 2511617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 2512ac27a0ecSDave Kleikamp value, value_len, flags); 2513617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 2514ac27a0ecSDave Kleikamp if (error == -ENOSPC && 2515e50e5129SAndreas Dilger ext4_should_retry_alloc(sb, &retries)) 2516ac27a0ecSDave Kleikamp goto retry; 2517ac27a0ecSDave Kleikamp if (error == 0) 2518ac27a0ecSDave Kleikamp error = error2; 2519ac27a0ecSDave Kleikamp } 2520ac27a0ecSDave Kleikamp 2521ac27a0ecSDave Kleikamp return error; 2522ac27a0ecSDave Kleikamp } 2523ac27a0ecSDave Kleikamp 2524ac27a0ecSDave Kleikamp /* 25256dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 25266dd4ee7cSKalpak Shah * i_extra_isize. 25276dd4ee7cSKalpak Shah */ 25286dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 25296dd4ee7cSKalpak Shah int value_offs_shift, void *to, 253094405713SJan Kara void *from, size_t n) 25316dd4ee7cSKalpak Shah { 25326dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 25336dd4ee7cSKalpak Shah int new_offs; 25346dd4ee7cSKalpak Shah 253594405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 253694405713SJan Kara BUG_ON(value_offs_shift > 0); 253794405713SJan Kara 25386dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 25396dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 2540e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 25416dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 25426dd4ee7cSKalpak Shah value_offs_shift; 25436dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 25446dd4ee7cSKalpak Shah } 25456dd4ee7cSKalpak Shah } 25466dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 25476dd4ee7cSKalpak Shah memmove(to, from, n); 25486dd4ee7cSKalpak Shah } 25496dd4ee7cSKalpak Shah 25506dd4ee7cSKalpak Shah /* 25513f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 25523f2571c1SJan Kara */ 25533f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 25543f2571c1SJan Kara struct ext4_inode *raw_inode, 25553f2571c1SJan Kara struct ext4_xattr_entry *entry) 25563f2571c1SJan Kara { 25573f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 25583f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 25593f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 2560f6109100STahsin Erdogan size_t value_size = le32_to_cpu(entry->e_value_size); 25613f2571c1SJan Kara struct ext4_xattr_info i = { 25623f2571c1SJan Kara .value = NULL, 25633f2571c1SJan Kara .value_len = 0, 25643f2571c1SJan Kara .name_index = entry->e_name_index, 2565f6109100STahsin Erdogan .in_inode = !!entry->e_value_inum, 25663f2571c1SJan Kara }; 25673f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 25683f2571c1SJan Kara int error; 25693f2571c1SJan Kara 25703f2571c1SJan Kara is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 25713f2571c1SJan Kara bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 25723f2571c1SJan Kara buffer = kmalloc(value_size, GFP_NOFS); 25733f2571c1SJan Kara b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 25743f2571c1SJan Kara if (!is || !bs || !buffer || !b_entry_name) { 25753f2571c1SJan Kara error = -ENOMEM; 25763f2571c1SJan Kara goto out; 25773f2571c1SJan Kara } 25783f2571c1SJan Kara 25793f2571c1SJan Kara is->s.not_found = -ENODATA; 25803f2571c1SJan Kara bs->s.not_found = -ENODATA; 25813f2571c1SJan Kara is->iloc.bh = NULL; 25823f2571c1SJan Kara bs->bh = NULL; 25833f2571c1SJan Kara 25843f2571c1SJan Kara /* Save the entry name and the entry value */ 2585f6109100STahsin Erdogan if (entry->e_value_inum) { 2586b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, value_size); 2587f6109100STahsin Erdogan if (error) 2588f6109100STahsin Erdogan goto out; 2589f6109100STahsin Erdogan } else { 2590f6109100STahsin Erdogan size_t value_offs = le16_to_cpu(entry->e_value_offs); 25913f2571c1SJan Kara memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); 2592f6109100STahsin Erdogan } 2593f6109100STahsin Erdogan 25943f2571c1SJan Kara memcpy(b_entry_name, entry->e_name, entry->e_name_len); 25953f2571c1SJan Kara b_entry_name[entry->e_name_len] = '\0'; 25963f2571c1SJan Kara i.name = b_entry_name; 25973f2571c1SJan Kara 25983f2571c1SJan Kara error = ext4_get_inode_loc(inode, &is->iloc); 25993f2571c1SJan Kara if (error) 26003f2571c1SJan Kara goto out; 26013f2571c1SJan Kara 26023f2571c1SJan Kara error = ext4_xattr_ibody_find(inode, &i, is); 26033f2571c1SJan Kara if (error) 26043f2571c1SJan Kara goto out; 26053f2571c1SJan Kara 26063f2571c1SJan Kara /* Remove the chosen entry from the inode */ 2607e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, is); 26083f2571c1SJan Kara if (error) 26093f2571c1SJan Kara goto out; 26103f2571c1SJan Kara 26113f2571c1SJan Kara i.value = buffer; 26123f2571c1SJan Kara i.value_len = value_size; 26133f2571c1SJan Kara error = ext4_xattr_block_find(inode, &i, bs); 26143f2571c1SJan Kara if (error) 26153f2571c1SJan Kara goto out; 26163f2571c1SJan Kara 26173f2571c1SJan Kara /* Add entry which was removed from the inode into the block */ 26183f2571c1SJan Kara error = ext4_xattr_block_set(handle, inode, &i, bs); 26193f2571c1SJan Kara if (error) 26203f2571c1SJan Kara goto out; 26213f2571c1SJan Kara error = 0; 26223f2571c1SJan Kara out: 26233f2571c1SJan Kara kfree(b_entry_name); 26243f2571c1SJan Kara kfree(buffer); 26253f2571c1SJan Kara if (is) 26263f2571c1SJan Kara brelse(is->iloc.bh); 26273f2571c1SJan Kara kfree(is); 26283f2571c1SJan Kara kfree(bs); 26293f2571c1SJan Kara 26303f2571c1SJan Kara return error; 26313f2571c1SJan Kara } 26323f2571c1SJan Kara 2633dfa2064bSJan Kara static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, 2634dfa2064bSJan Kara struct ext4_inode *raw_inode, 2635dfa2064bSJan Kara int isize_diff, size_t ifree, 2636dfa2064bSJan Kara size_t bfree, int *total_ino) 2637dfa2064bSJan Kara { 2638dfa2064bSJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 2639dfa2064bSJan Kara struct ext4_xattr_entry *small_entry; 2640dfa2064bSJan Kara struct ext4_xattr_entry *entry; 2641dfa2064bSJan Kara struct ext4_xattr_entry *last; 2642dfa2064bSJan Kara unsigned int entry_size; /* EA entry size */ 2643dfa2064bSJan Kara unsigned int total_size; /* EA entry size + value size */ 2644dfa2064bSJan Kara unsigned int min_total_size; 2645dfa2064bSJan Kara int error; 2646dfa2064bSJan Kara 2647dfa2064bSJan Kara while (isize_diff > ifree) { 2648dfa2064bSJan Kara entry = NULL; 2649dfa2064bSJan Kara small_entry = NULL; 2650dfa2064bSJan Kara min_total_size = ~0U; 2651dfa2064bSJan Kara last = IFIRST(header); 2652dfa2064bSJan Kara /* Find the entry best suited to be pushed into EA block */ 2653dfa2064bSJan Kara for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 26549bb21cedSTahsin Erdogan total_size = EXT4_XATTR_LEN(last->e_name_len); 26559bb21cedSTahsin Erdogan if (!last->e_value_inum) 26569bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 26579bb21cedSTahsin Erdogan le32_to_cpu(last->e_value_size)); 2658dfa2064bSJan Kara if (total_size <= bfree && 2659dfa2064bSJan Kara total_size < min_total_size) { 2660dfa2064bSJan Kara if (total_size + ifree < isize_diff) { 2661dfa2064bSJan Kara small_entry = last; 2662dfa2064bSJan Kara } else { 2663dfa2064bSJan Kara entry = last; 2664dfa2064bSJan Kara min_total_size = total_size; 2665dfa2064bSJan Kara } 2666dfa2064bSJan Kara } 2667dfa2064bSJan Kara } 2668dfa2064bSJan Kara 2669dfa2064bSJan Kara if (entry == NULL) { 2670dfa2064bSJan Kara if (small_entry == NULL) 2671dfa2064bSJan Kara return -ENOSPC; 2672dfa2064bSJan Kara entry = small_entry; 2673dfa2064bSJan Kara } 2674dfa2064bSJan Kara 2675dfa2064bSJan Kara entry_size = EXT4_XATTR_LEN(entry->e_name_len); 26769bb21cedSTahsin Erdogan total_size = entry_size; 26779bb21cedSTahsin Erdogan if (!entry->e_value_inum) 26789bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 26799bb21cedSTahsin Erdogan le32_to_cpu(entry->e_value_size)); 2680dfa2064bSJan Kara error = ext4_xattr_move_to_block(handle, inode, raw_inode, 2681dfa2064bSJan Kara entry); 2682dfa2064bSJan Kara if (error) 2683dfa2064bSJan Kara return error; 2684dfa2064bSJan Kara 2685dfa2064bSJan Kara *total_ino -= entry_size; 2686dfa2064bSJan Kara ifree += total_size; 2687dfa2064bSJan Kara bfree -= total_size; 2688dfa2064bSJan Kara } 2689dfa2064bSJan Kara 2690dfa2064bSJan Kara return 0; 2691dfa2064bSJan Kara } 2692dfa2064bSJan Kara 26933f2571c1SJan Kara /* 26946dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 26956dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 26966dd4ee7cSKalpak Shah */ 26976dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 26986dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 26996dd4ee7cSKalpak Shah { 27006dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 2701b640b2c5SMiao Xie struct buffer_head *bh; 2702cf0a5e81SMiao Xie struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 2703cf0a5e81SMiao Xie static unsigned int mnt_count; 2704e3014d14SJan Kara size_t min_offs; 2705e3014d14SJan Kara size_t ifree, bfree; 27067b1b2c1bSTheodore Ts'o int total_ino; 27076e0cd088SJan Kara void *base, *end; 2708d0141191SJan Kara int error = 0, tried_min_extra_isize = 0; 2709cf0a5e81SMiao Xie int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); 2710d0141191SJan Kara int isize_diff; /* How much do we need to grow i_extra_isize */ 2711c755e251STheodore Ts'o 27126dd4ee7cSKalpak Shah retry: 2713d0141191SJan Kara isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; 27142e81a4eeSJan Kara if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) 2715b640b2c5SMiao Xie return 0; 27166dd4ee7cSKalpak Shah 27176dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 27186dd4ee7cSKalpak Shah 27196dd4ee7cSKalpak Shah /* 27206dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 27216dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 27226dd4ee7cSKalpak Shah */ 27236dd4ee7cSKalpak Shah 27246e0cd088SJan Kara base = IFIRST(header); 27256dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 27266dd4ee7cSKalpak Shah min_offs = end - base; 27276dd4ee7cSKalpak Shah total_ino = sizeof(struct ext4_xattr_ibody_header); 27286dd4ee7cSKalpak Shah 27299e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 27309e92f48cSTheodore Ts'o if (error) 27319e92f48cSTheodore Ts'o goto cleanup; 27329e92f48cSTheodore Ts'o 27336e0cd088SJan Kara ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); 2734e3014d14SJan Kara if (ifree >= isize_diff) 2735e3014d14SJan Kara goto shift; 27366dd4ee7cSKalpak Shah 27376dd4ee7cSKalpak Shah /* 27386dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 27396dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 27406dd4ee7cSKalpak Shah */ 27416dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 27426dd4ee7cSKalpak Shah bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 27436dd4ee7cSKalpak Shah error = -EIO; 27446dd4ee7cSKalpak Shah if (!bh) 27456dd4ee7cSKalpak Shah goto cleanup; 2746de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 2747de05ca85STheodore Ts'o if (error) 27486dd4ee7cSKalpak Shah goto cleanup; 27496dd4ee7cSKalpak Shah base = BHDR(bh); 27506dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 27516dd4ee7cSKalpak Shah min_offs = end - base; 27526e0cd088SJan Kara bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, 27536e0cd088SJan Kara NULL); 2754b640b2c5SMiao Xie brelse(bh); 2755e3014d14SJan Kara if (bfree + ifree < isize_diff) { 27566dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 27576dd4ee7cSKalpak Shah tried_min_extra_isize++; 27586dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 27596dd4ee7cSKalpak Shah goto retry; 27606dd4ee7cSKalpak Shah } 2761dfa2064bSJan Kara error = -ENOSPC; 27626dd4ee7cSKalpak Shah goto cleanup; 27636dd4ee7cSKalpak Shah } 27646dd4ee7cSKalpak Shah } else { 2765e3014d14SJan Kara bfree = inode->i_sb->s_blocksize; 27666dd4ee7cSKalpak Shah } 27676dd4ee7cSKalpak Shah 2768dfa2064bSJan Kara error = ext4_xattr_make_inode_space(handle, inode, raw_inode, 2769dfa2064bSJan Kara isize_diff, ifree, bfree, 2770dfa2064bSJan Kara &total_ino); 2771dfa2064bSJan Kara if (error) { 2772dfa2064bSJan Kara if (error == -ENOSPC && !tried_min_extra_isize && 27736dd4ee7cSKalpak Shah s_min_extra_isize) { 27746dd4ee7cSKalpak Shah tried_min_extra_isize++; 27756dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 27766dd4ee7cSKalpak Shah goto retry; 27776dd4ee7cSKalpak Shah } 27786dd4ee7cSKalpak Shah goto cleanup; 27796dd4ee7cSKalpak Shah } 2780e3014d14SJan Kara shift: 2781e3014d14SJan Kara /* Adjust the offsets and shift the remaining entries ahead */ 27826e0cd088SJan Kara ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize 2783e3014d14SJan Kara - new_extra_isize, (void *)raw_inode + 2784e3014d14SJan Kara EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 278594405713SJan Kara (void *)header, total_ino); 2786e3014d14SJan Kara EXT4_I(inode)->i_extra_isize = new_extra_isize; 27876dd4ee7cSKalpak Shah 27886dd4ee7cSKalpak Shah cleanup: 2789b640b2c5SMiao Xie if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) { 2790cf0a5e81SMiao Xie ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", 2791cf0a5e81SMiao Xie inode->i_ino); 2792cf0a5e81SMiao Xie mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); 2793cf0a5e81SMiao Xie } 27946dd4ee7cSKalpak Shah return error; 27956dd4ee7cSKalpak Shah } 27966dd4ee7cSKalpak Shah 2797e50e5129SAndreas Dilger #define EIA_INCR 16 /* must be 2^n */ 2798e50e5129SAndreas Dilger #define EIA_MASK (EIA_INCR - 1) 2799dec214d0STahsin Erdogan 2800dec214d0STahsin Erdogan /* Add the large xattr @inode into @ea_inode_array for deferred iput(). 28010421a189STahsin Erdogan * If @ea_inode_array is new or full it will be grown and the old 2802e50e5129SAndreas Dilger * contents copied over. 2803e50e5129SAndreas Dilger */ 2804e50e5129SAndreas Dilger static int 28050421a189STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 28060421a189STahsin Erdogan struct inode *inode) 2807e50e5129SAndreas Dilger { 28080421a189STahsin Erdogan if (*ea_inode_array == NULL) { 2809e50e5129SAndreas Dilger /* 2810e50e5129SAndreas Dilger * Start with 15 inodes, so it fits into a power-of-two size. 28110421a189STahsin Erdogan * If *ea_inode_array is NULL, this is essentially offsetof() 2812e50e5129SAndreas Dilger */ 28130421a189STahsin Erdogan (*ea_inode_array) = 28140421a189STahsin Erdogan kmalloc(offsetof(struct ext4_xattr_inode_array, 28150421a189STahsin Erdogan inodes[EIA_MASK]), 2816e50e5129SAndreas Dilger GFP_NOFS); 28170421a189STahsin Erdogan if (*ea_inode_array == NULL) 2818e50e5129SAndreas Dilger return -ENOMEM; 28190421a189STahsin Erdogan (*ea_inode_array)->count = 0; 28200421a189STahsin Erdogan } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { 2821e50e5129SAndreas Dilger /* expand the array once all 15 + n * 16 slots are full */ 28220421a189STahsin Erdogan struct ext4_xattr_inode_array *new_array = NULL; 28230421a189STahsin Erdogan int count = (*ea_inode_array)->count; 2824e50e5129SAndreas Dilger 2825e50e5129SAndreas Dilger /* if new_array is NULL, this is essentially offsetof() */ 2826e50e5129SAndreas Dilger new_array = kmalloc( 28270421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, 28280421a189STahsin Erdogan inodes[count + EIA_INCR]), 2829e50e5129SAndreas Dilger GFP_NOFS); 2830e50e5129SAndreas Dilger if (new_array == NULL) 2831e50e5129SAndreas Dilger return -ENOMEM; 28320421a189STahsin Erdogan memcpy(new_array, *ea_inode_array, 28330421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, inodes[count])); 28340421a189STahsin Erdogan kfree(*ea_inode_array); 28350421a189STahsin Erdogan *ea_inode_array = new_array; 2836e50e5129SAndreas Dilger } 28370421a189STahsin Erdogan (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; 2838e50e5129SAndreas Dilger return 0; 2839e50e5129SAndreas Dilger } 2840e50e5129SAndreas Dilger 28416dd4ee7cSKalpak Shah /* 2842617ba13bSMingming Cao * ext4_xattr_delete_inode() 2843ac27a0ecSDave Kleikamp * 2844e50e5129SAndreas Dilger * Free extended attribute resources associated with this inode. Traverse 2845dec214d0STahsin Erdogan * all entries and decrement reference on any xattr inodes associated with this 2846dec214d0STahsin Erdogan * inode. This is called immediately before an inode is freed. We have exclusive 2847dec214d0STahsin Erdogan * access to the inode. If an orphan inode is deleted it will also release its 2848dec214d0STahsin Erdogan * references on xattr block and xattr inodes. 2849ac27a0ecSDave Kleikamp */ 2850dec214d0STahsin Erdogan int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, 285130a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 285230a7eb97STahsin Erdogan int extra_credits) 2853ac27a0ecSDave Kleikamp { 2854ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 2855e50e5129SAndreas Dilger struct ext4_xattr_ibody_header *header; 285630a7eb97STahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 2857dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 2858a6d05676STahsin Erdogan struct inode *ea_inode; 285930a7eb97STahsin Erdogan int error; 286030a7eb97STahsin Erdogan 286130a7eb97STahsin Erdogan error = ext4_xattr_ensure_credits(handle, inode, extra_credits, 286230a7eb97STahsin Erdogan NULL /* bh */, 286330a7eb97STahsin Erdogan false /* dirty */, 286430a7eb97STahsin Erdogan false /* block_csum */); 286530a7eb97STahsin Erdogan if (error) { 286630a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); 286730a7eb97STahsin Erdogan goto cleanup; 286830a7eb97STahsin Erdogan } 2869ac27a0ecSDave Kleikamp 2870dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2871dec214d0STahsin Erdogan ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 2872e50e5129SAndreas Dilger 2873e50e5129SAndreas Dilger error = ext4_get_inode_loc(inode, &iloc); 2874dec214d0STahsin Erdogan if (error) { 2875dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); 2876e50e5129SAndreas Dilger goto cleanup; 2877e50e5129SAndreas Dilger } 2878dec214d0STahsin Erdogan 2879dec214d0STahsin Erdogan error = ext4_journal_get_write_access(handle, iloc.bh); 2880dec214d0STahsin Erdogan if (error) { 2881dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "write access (error %d)", 2882dec214d0STahsin Erdogan error); 2883dec214d0STahsin Erdogan goto cleanup; 2884dec214d0STahsin Erdogan } 2885dec214d0STahsin Erdogan 2886dec214d0STahsin Erdogan header = IHDR(inode, ext4_raw_inode(&iloc)); 2887dec214d0STahsin Erdogan if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) 2888dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, 2889dec214d0STahsin Erdogan IFIRST(header), 2890dec214d0STahsin Erdogan false /* block_csum */, 2891dec214d0STahsin Erdogan ea_inode_array, 2892dec214d0STahsin Erdogan extra_credits, 2893dec214d0STahsin Erdogan false /* skip_quota */); 2894dec214d0STahsin Erdogan } 2895dec214d0STahsin Erdogan 2896dec214d0STahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 2897617ba13bSMingming Cao bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl); 2898ac27a0ecSDave Kleikamp if (!bh) { 289924676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 290024676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 290165d30005STahsin Erdogan error = -EIO; 2902ac27a0ecSDave Kleikamp goto cleanup; 2903ac27a0ecSDave Kleikamp } 2904dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2905de05ca85STheodore Ts'o if (error) 2906ac27a0ecSDave Kleikamp goto cleanup; 2907e50e5129SAndreas Dilger 290830a7eb97STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) { 2909dec214d0STahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 2910a6d05676STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 2911a6d05676STahsin Erdogan if (!entry->e_value_inum) 2912a6d05676STahsin Erdogan continue; 2913a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, 2914a6d05676STahsin Erdogan le32_to_cpu(entry->e_value_inum), 2915a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 2916a6d05676STahsin Erdogan &ea_inode); 2917a6d05676STahsin Erdogan if (error) 2918a6d05676STahsin Erdogan continue; 2919a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, ea_inode, 2920dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 2921a6d05676STahsin Erdogan iput(ea_inode); 2922a6d05676STahsin Erdogan } 2923dec214d0STahsin Erdogan 2924e50e5129SAndreas Dilger } 2925e50e5129SAndreas Dilger 2926dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bh, ea_inode_array, 2927dec214d0STahsin Erdogan extra_credits); 2928dec214d0STahsin Erdogan /* 2929dec214d0STahsin Erdogan * Update i_file_acl value in the same transaction that releases 2930dec214d0STahsin Erdogan * block. 2931dec214d0STahsin Erdogan */ 2932617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 293330a7eb97STahsin Erdogan error = ext4_mark_inode_dirty(handle, inode); 293430a7eb97STahsin Erdogan if (error) { 293530a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", 293630a7eb97STahsin Erdogan error); 293730a7eb97STahsin Erdogan goto cleanup; 293830a7eb97STahsin Erdogan } 2939dec214d0STahsin Erdogan } 2940dec214d0STahsin Erdogan error = 0; 2941ac27a0ecSDave Kleikamp cleanup: 294230a7eb97STahsin Erdogan brelse(iloc.bh); 2943ac27a0ecSDave Kleikamp brelse(bh); 2944e50e5129SAndreas Dilger return error; 2945e50e5129SAndreas Dilger } 2946e50e5129SAndreas Dilger 29470421a189STahsin Erdogan void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) 2948e50e5129SAndreas Dilger { 2949dec214d0STahsin Erdogan int idx; 2950e50e5129SAndreas Dilger 29510421a189STahsin Erdogan if (ea_inode_array == NULL) 2952e50e5129SAndreas Dilger return; 2953e50e5129SAndreas Dilger 2954dec214d0STahsin Erdogan for (idx = 0; idx < ea_inode_array->count; ++idx) 2955dec214d0STahsin Erdogan iput(ea_inode_array->inodes[idx]); 29560421a189STahsin Erdogan kfree(ea_inode_array); 2957ac27a0ecSDave Kleikamp } 2958ac27a0ecSDave Kleikamp 2959ac27a0ecSDave Kleikamp /* 296047387409STahsin Erdogan * ext4_xattr_block_cache_insert() 2961ac27a0ecSDave Kleikamp * 296247387409STahsin Erdogan * Create a new entry in the extended attribute block cache, and insert 2963ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 2964ac27a0ecSDave Kleikamp * 2965ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2966ac27a0ecSDave Kleikamp */ 2967ac27a0ecSDave Kleikamp static void 296847387409STahsin Erdogan ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, 296947387409STahsin Erdogan struct buffer_head *bh) 2970ac27a0ecSDave Kleikamp { 29716048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 29726048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 29736048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 29746048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 2975ac27a0ecSDave Kleikamp int error; 2976ac27a0ecSDave Kleikamp 2977cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 2978cdb7ee4cSTahsin Erdogan return; 297947387409STahsin Erdogan error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, 29806048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 2981ac27a0ecSDave Kleikamp if (error) { 298282939d79SJan Kara if (error == -EBUSY) 2983ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 298482939d79SJan Kara } else 2985ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 2986ac27a0ecSDave Kleikamp } 2987ac27a0ecSDave Kleikamp 2988ac27a0ecSDave Kleikamp /* 2989617ba13bSMingming Cao * ext4_xattr_cmp() 2990ac27a0ecSDave Kleikamp * 2991ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 2992ac27a0ecSDave Kleikamp * 2993ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 2994ac27a0ecSDave Kleikamp * a negative error number on errors. 2995ac27a0ecSDave Kleikamp */ 2996ac27a0ecSDave Kleikamp static int 2997617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 2998617ba13bSMingming Cao struct ext4_xattr_header *header2) 2999ac27a0ecSDave Kleikamp { 3000617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 3001ac27a0ecSDave Kleikamp 3002ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 3003ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 3004ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 3005ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 3006ac27a0ecSDave Kleikamp return 1; 3007ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 3008ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 3009ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 3010ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 3011e50e5129SAndreas Dilger entry1->e_value_inum != entry2->e_value_inum || 3012ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 3013ac27a0ecSDave Kleikamp return 1; 30147cec1918STahsin Erdogan if (!entry1->e_value_inum && 30157cec1918STahsin Erdogan memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 3016ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 3017ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 3018ac27a0ecSDave Kleikamp return 1; 3019ac27a0ecSDave Kleikamp 3020617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 3021617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 3022ac27a0ecSDave Kleikamp } 3023ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 3024ac27a0ecSDave Kleikamp return 1; 3025ac27a0ecSDave Kleikamp return 0; 3026ac27a0ecSDave Kleikamp } 3027ac27a0ecSDave Kleikamp 3028ac27a0ecSDave Kleikamp /* 302947387409STahsin Erdogan * ext4_xattr_block_cache_find() 3030ac27a0ecSDave Kleikamp * 3031ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 3032ac27a0ecSDave Kleikamp * 3033ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 3034ac27a0ecSDave Kleikamp * not found or an error occurred. 3035ac27a0ecSDave Kleikamp */ 3036ac27a0ecSDave Kleikamp static struct buffer_head * 303747387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *inode, 303847387409STahsin Erdogan struct ext4_xattr_header *header, 30397a2508e1SJan Kara struct mb_cache_entry **pce) 3040ac27a0ecSDave Kleikamp { 3041ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 30427a2508e1SJan Kara struct mb_cache_entry *ce; 304347387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 3044ac27a0ecSDave Kleikamp 3045cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 3046cdb7ee4cSTahsin Erdogan return NULL; 3047ac27a0ecSDave Kleikamp if (!header->h_hash) 3048ac27a0ecSDave Kleikamp return NULL; /* never share */ 3049ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 305047387409STahsin Erdogan ce = mb_cache_entry_find_first(ea_block_cache, hash); 3051ac27a0ecSDave Kleikamp while (ce) { 3052ac27a0ecSDave Kleikamp struct buffer_head *bh; 3053ac27a0ecSDave Kleikamp 3054c07dfcb4STahsin Erdogan bh = sb_bread(inode->i_sb, ce->e_value); 3055ac27a0ecSDave Kleikamp if (!bh) { 305624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 3057c07dfcb4STahsin Erdogan (unsigned long)ce->e_value); 3058617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 3059ac27a0ecSDave Kleikamp *pce = ce; 3060ac27a0ecSDave Kleikamp return bh; 3061ac27a0ecSDave Kleikamp } 3062ac27a0ecSDave Kleikamp brelse(bh); 306347387409STahsin Erdogan ce = mb_cache_entry_find_next(ea_block_cache, ce); 3064ac27a0ecSDave Kleikamp } 3065ac27a0ecSDave Kleikamp return NULL; 3066ac27a0ecSDave Kleikamp } 3067ac27a0ecSDave Kleikamp 3068ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 3069ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 3070ac27a0ecSDave Kleikamp 3071ac27a0ecSDave Kleikamp /* 3072617ba13bSMingming Cao * ext4_xattr_hash_entry() 3073ac27a0ecSDave Kleikamp * 3074ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 3075ac27a0ecSDave Kleikamp */ 3076b9fc761eSTahsin Erdogan static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, 3077b9fc761eSTahsin Erdogan size_t value_count) 3078ac27a0ecSDave Kleikamp { 3079ac27a0ecSDave Kleikamp __u32 hash = 0; 3080ac27a0ecSDave Kleikamp 3081b9fc761eSTahsin Erdogan while (name_len--) { 3082ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 3083ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 3084ac27a0ecSDave Kleikamp *name++; 3085ac27a0ecSDave Kleikamp } 3086b9fc761eSTahsin Erdogan while (value_count--) { 3087ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 3088ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 3089ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 3090ac27a0ecSDave Kleikamp } 3091b9fc761eSTahsin Erdogan return cpu_to_le32(hash); 3092ac27a0ecSDave Kleikamp } 3093ac27a0ecSDave Kleikamp 3094ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 3095ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 3096ac27a0ecSDave Kleikamp 3097ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 3098ac27a0ecSDave Kleikamp 3099ac27a0ecSDave Kleikamp /* 3100617ba13bSMingming Cao * ext4_xattr_rehash() 3101ac27a0ecSDave Kleikamp * 3102ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 3103ac27a0ecSDave Kleikamp */ 3104daf83281STahsin Erdogan static void ext4_xattr_rehash(struct ext4_xattr_header *header) 3105ac27a0ecSDave Kleikamp { 3106617ba13bSMingming Cao struct ext4_xattr_entry *here; 3107ac27a0ecSDave Kleikamp __u32 hash = 0; 3108ac27a0ecSDave Kleikamp 3109ac27a0ecSDave Kleikamp here = ENTRY(header+1); 3110ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 3111ac27a0ecSDave Kleikamp if (!here->e_hash) { 3112ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 3113ac27a0ecSDave Kleikamp hash = 0; 3114ac27a0ecSDave Kleikamp break; 3115ac27a0ecSDave Kleikamp } 3116ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 3117ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 3118ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 3119617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 3120ac27a0ecSDave Kleikamp } 3121ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 3122ac27a0ecSDave Kleikamp } 3123ac27a0ecSDave Kleikamp 3124ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 3125ac27a0ecSDave Kleikamp 31269c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 31279c191f70ST Makphaibulchoke 31287a2508e1SJan Kara struct mb_cache * 312982939d79SJan Kara ext4_xattr_create_cache(void) 3130ac27a0ecSDave Kleikamp { 31317a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 3132ac27a0ecSDave Kleikamp } 3133ac27a0ecSDave Kleikamp 31347a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 3135ac27a0ecSDave Kleikamp { 31369c191f70ST Makphaibulchoke if (cache) 31377a2508e1SJan Kara mb_cache_destroy(cache); 3138ac27a0ecSDave Kleikamp } 31399c191f70ST Makphaibulchoke 3140