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 9688ee9d57SJan (janneke) Nieuwenhuizen [EXT4_XATTR_INDEX_HURD] = &ext4_xattr_hurd_handler, 97ac27a0ecSDave Kleikamp }; 98ac27a0ecSDave Kleikamp 9911e27528SStephen Hemminger const struct xattr_handler *ext4_xattr_handlers[] = { 100617ba13bSMingming Cao &ext4_xattr_user_handler, 101617ba13bSMingming Cao &ext4_xattr_trusted_handler, 10203010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 10364e178a7SChristoph Hellwig &posix_acl_access_xattr_handler, 10464e178a7SChristoph Hellwig &posix_acl_default_xattr_handler, 105ac27a0ecSDave Kleikamp #endif 10603010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 107617ba13bSMingming Cao &ext4_xattr_security_handler, 108ac27a0ecSDave Kleikamp #endif 10988ee9d57SJan (janneke) Nieuwenhuizen &ext4_xattr_hurd_handler, 110ac27a0ecSDave Kleikamp NULL 111ac27a0ecSDave Kleikamp }; 112ac27a0ecSDave Kleikamp 11347387409STahsin Erdogan #define EA_BLOCK_CACHE(inode) (((struct ext4_sb_info *) \ 11447387409STahsin Erdogan inode->i_sb->s_fs_info)->s_ea_block_cache) 1159c191f70ST Makphaibulchoke 116dec214d0STahsin Erdogan #define EA_INODE_CACHE(inode) (((struct ext4_sb_info *) \ 117dec214d0STahsin Erdogan inode->i_sb->s_fs_info)->s_ea_inode_cache) 118dec214d0STahsin Erdogan 11930a7eb97STahsin Erdogan static int 12030a7eb97STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 12130a7eb97STahsin Erdogan struct inode *inode); 12230a7eb97STahsin Erdogan 12333d201e0STahsin Erdogan #ifdef CONFIG_LOCKDEP 12433d201e0STahsin Erdogan void ext4_xattr_inode_set_class(struct inode *ea_inode) 12533d201e0STahsin Erdogan { 12633d201e0STahsin Erdogan lockdep_set_subclass(&ea_inode->i_rwsem, 1); 12733d201e0STahsin Erdogan } 12833d201e0STahsin Erdogan #endif 12933d201e0STahsin Erdogan 130cc8e94fdSDarrick J. Wong static __le32 ext4_xattr_block_csum(struct inode *inode, 131cc8e94fdSDarrick J. Wong sector_t block_nr, 132cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 133cc8e94fdSDarrick J. Wong { 134cc8e94fdSDarrick J. Wong struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 135d6a77105STheodore Ts'o __u32 csum; 136d6a77105STheodore Ts'o __le64 dsk_block_nr = cpu_to_le64(block_nr); 137b47820edSDaeho Jeong __u32 dummy_csum = 0; 138b47820edSDaeho Jeong int offset = offsetof(struct ext4_xattr_header, h_checksum); 139cc8e94fdSDarrick J. Wong 140d6a77105STheodore Ts'o csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, 141d6a77105STheodore Ts'o sizeof(dsk_block_nr)); 142b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); 143b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); 144b47820edSDaeho Jeong offset += sizeof(dummy_csum); 145b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, 146b47820edSDaeho Jeong EXT4_BLOCK_SIZE(inode->i_sb) - offset); 14741eb70ddSTao Ma 148cc8e94fdSDarrick J. Wong return cpu_to_le32(csum); 149cc8e94fdSDarrick J. Wong } 150cc8e94fdSDarrick J. Wong 151cc8e94fdSDarrick J. Wong static int ext4_xattr_block_csum_verify(struct inode *inode, 152dac7a4b4STheodore Ts'o struct buffer_head *bh) 153cc8e94fdSDarrick J. Wong { 154dac7a4b4STheodore Ts'o struct ext4_xattr_header *hdr = BHDR(bh); 155dac7a4b4STheodore Ts'o int ret = 1; 156dac7a4b4STheodore Ts'o 157dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) { 158dac7a4b4STheodore Ts'o lock_buffer(bh); 159dac7a4b4STheodore Ts'o ret = (hdr->h_checksum == ext4_xattr_block_csum(inode, 160dac7a4b4STheodore Ts'o bh->b_blocknr, hdr)); 161dac7a4b4STheodore Ts'o unlock_buffer(bh); 162dac7a4b4STheodore Ts'o } 163dac7a4b4STheodore Ts'o return ret; 164cc8e94fdSDarrick J. Wong } 165cc8e94fdSDarrick J. Wong 166cc8e94fdSDarrick J. Wong static void ext4_xattr_block_csum_set(struct inode *inode, 167cc8e94fdSDarrick J. Wong struct buffer_head *bh) 168cc8e94fdSDarrick J. Wong { 169dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) 170dac7a4b4STheodore Ts'o BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode, 171dac7a4b4STheodore Ts'o bh->b_blocknr, BHDR(bh)); 172cc8e94fdSDarrick J. Wong } 173cc8e94fdSDarrick J. Wong 17411e27528SStephen Hemminger static inline const struct xattr_handler * 175617ba13bSMingming Cao ext4_xattr_handler(int name_index) 176ac27a0ecSDave Kleikamp { 17711e27528SStephen Hemminger const struct xattr_handler *handler = NULL; 178ac27a0ecSDave Kleikamp 179617ba13bSMingming Cao if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) 180617ba13bSMingming Cao handler = ext4_xattr_handler_map[name_index]; 181ac27a0ecSDave Kleikamp return handler; 182ac27a0ecSDave Kleikamp } 183ac27a0ecSDave Kleikamp 184ac27a0ecSDave Kleikamp static int 1852c4f9923SEric Biggers ext4_xattr_check_entries(struct ext4_xattr_entry *entry, void *end, 186a0626e75SDarrick J. Wong void *value_start) 187ac27a0ecSDave Kleikamp { 188a0626e75SDarrick J. Wong struct ext4_xattr_entry *e = entry; 189a0626e75SDarrick J. Wong 190d7614cc1SEric Biggers /* Find the end of the names list */ 191a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(e)) { 192a0626e75SDarrick J. Wong struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); 193ac27a0ecSDave Kleikamp if ((void *)next >= end) 1946a797d27SDarrick J. Wong return -EFSCORRUPTED; 1957d95178cSTheodore Ts'o if (strnlen(e->e_name, e->e_name_len) != e->e_name_len) 1967d95178cSTheodore Ts'o return -EFSCORRUPTED; 197a0626e75SDarrick J. Wong e = next; 198ac27a0ecSDave Kleikamp } 199a0626e75SDarrick J. Wong 200d7614cc1SEric Biggers /* Check the values */ 201a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(entry)) { 202d7614cc1SEric Biggers u32 size = le32_to_cpu(entry->e_value_size); 203ce3fd194SEric Biggers 20454dd0e0aSTheodore Ts'o if (size > EXT4_XATTR_SIZE_MAX) 205ce3fd194SEric Biggers return -EFSCORRUPTED; 206ce3fd194SEric Biggers 207ce3fd194SEric Biggers if (size != 0 && entry->e_value_inum == 0) { 208ce3fd194SEric Biggers u16 offs = le16_to_cpu(entry->e_value_offs); 209d7614cc1SEric Biggers void *value; 210d7614cc1SEric Biggers 211d7614cc1SEric Biggers /* 212d7614cc1SEric Biggers * The value cannot overlap the names, and the value 213d7614cc1SEric Biggers * with padding cannot extend beyond 'end'. Check both 214d7614cc1SEric Biggers * the padded and unpadded sizes, since the size may 215d7614cc1SEric Biggers * overflow to 0 when adding padding. 216d7614cc1SEric Biggers */ 217d7614cc1SEric Biggers if (offs > end - value_start) 2186a797d27SDarrick J. Wong return -EFSCORRUPTED; 219d7614cc1SEric Biggers value = value_start + offs; 220d7614cc1SEric Biggers if (value < (void *)e + sizeof(u32) || 221d7614cc1SEric Biggers size > end - value || 222d7614cc1SEric Biggers EXT4_XATTR_SIZE(size) > end - value) 223d7614cc1SEric Biggers return -EFSCORRUPTED; 224d7614cc1SEric Biggers } 225a0626e75SDarrick J. Wong entry = EXT4_XATTR_NEXT(entry); 226a0626e75SDarrick J. Wong } 227a0626e75SDarrick J. Wong 228ac27a0ecSDave Kleikamp return 0; 229ac27a0ecSDave Kleikamp } 230ac27a0ecSDave Kleikamp 231ac27a0ecSDave Kleikamp static inline int 232de05ca85STheodore Ts'o __ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh, 233de05ca85STheodore Ts'o const char *function, unsigned int line) 234ac27a0ecSDave Kleikamp { 235de05ca85STheodore Ts'o int error = -EFSCORRUPTED; 236cc8e94fdSDarrick J. Wong 237617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 238ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) 239de05ca85STheodore Ts'o goto errout; 240513f86d7STheodore Ts'o if (buffer_verified(bh)) 241513f86d7STheodore Ts'o return 0; 242513f86d7STheodore Ts'o 243de05ca85STheodore Ts'o error = -EFSBADCRC; 244dac7a4b4STheodore Ts'o if (!ext4_xattr_block_csum_verify(inode, bh)) 245de05ca85STheodore Ts'o goto errout; 2462c4f9923SEric Biggers error = ext4_xattr_check_entries(BFIRST(bh), bh->b_data + bh->b_size, 247a0626e75SDarrick J. Wong bh->b_data); 248de05ca85STheodore Ts'o errout: 249de05ca85STheodore Ts'o if (error) 25054d3adbcSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, -error, 251de05ca85STheodore Ts'o "corrupted xattr block %llu", 252de05ca85STheodore Ts'o (unsigned long long) bh->b_blocknr); 253de05ca85STheodore Ts'o else 254cc8e94fdSDarrick J. Wong set_buffer_verified(bh); 255cc8e94fdSDarrick J. Wong return error; 256ac27a0ecSDave Kleikamp } 257ac27a0ecSDave Kleikamp 258de05ca85STheodore Ts'o #define ext4_xattr_check_block(inode, bh) \ 259de05ca85STheodore Ts'o __ext4_xattr_check_block((inode), (bh), __func__, __LINE__) 260de05ca85STheodore Ts'o 261de05ca85STheodore Ts'o 2629e92f48cSTheodore Ts'o static int 2639e92f48cSTheodore Ts'o __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, 2649e92f48cSTheodore Ts'o void *end, const char *function, unsigned int line) 2659e92f48cSTheodore Ts'o { 2669e92f48cSTheodore Ts'o int error = -EFSCORRUPTED; 2679e92f48cSTheodore Ts'o 268290ab230SEric Biggers if (end - (void *)header < sizeof(*header) + sizeof(u32) || 26919962509SEric Biggers (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) 2709e92f48cSTheodore Ts'o goto errout; 2712c4f9923SEric Biggers error = ext4_xattr_check_entries(IFIRST(header), end, IFIRST(header)); 2729e92f48cSTheodore Ts'o errout: 2739e92f48cSTheodore Ts'o if (error) 27454d3adbcSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, -error, 2759e92f48cSTheodore Ts'o "corrupted in-inode xattr"); 2769e92f48cSTheodore Ts'o return error; 2779e92f48cSTheodore Ts'o } 2789e92f48cSTheodore Ts'o 2799e92f48cSTheodore Ts'o #define xattr_check_inode(inode, header, end) \ 2809e92f48cSTheodore Ts'o __xattr_check_inode((inode), (header), (end), __func__, __LINE__) 2819e92f48cSTheodore Ts'o 282ac27a0ecSDave Kleikamp static int 2839496005dSTheodore Ts'o xattr_find_entry(struct inode *inode, struct ext4_xattr_entry **pentry, 2849496005dSTheodore Ts'o void *end, int name_index, const char *name, int sorted) 285ac27a0ecSDave Kleikamp { 2869496005dSTheodore Ts'o struct ext4_xattr_entry *entry, *next; 287ac27a0ecSDave Kleikamp size_t name_len; 288ac27a0ecSDave Kleikamp int cmp = 1; 289ac27a0ecSDave Kleikamp 290ac27a0ecSDave Kleikamp if (name == NULL) 291ac27a0ecSDave Kleikamp return -EINVAL; 292ac27a0ecSDave Kleikamp name_len = strlen(name); 2939496005dSTheodore Ts'o for (entry = *pentry; !IS_LAST_ENTRY(entry); entry = next) { 2949496005dSTheodore Ts'o next = EXT4_XATTR_NEXT(entry); 2959496005dSTheodore Ts'o if ((void *) next >= end) { 2969496005dSTheodore Ts'o EXT4_ERROR_INODE(inode, "corrupted xattr entries"); 2979496005dSTheodore Ts'o return -EFSCORRUPTED; 2989496005dSTheodore Ts'o } 299ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 300ac27a0ecSDave Kleikamp if (!cmp) 301ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 302ac27a0ecSDave Kleikamp if (!cmp) 303ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 304ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 305ac27a0ecSDave Kleikamp break; 306ac27a0ecSDave Kleikamp } 307ac27a0ecSDave Kleikamp *pentry = entry; 308ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 309ac27a0ecSDave Kleikamp } 310ac27a0ecSDave Kleikamp 311dec214d0STahsin Erdogan static u32 312dec214d0STahsin Erdogan ext4_xattr_inode_hash(struct ext4_sb_info *sbi, const void *buffer, size_t size) 313dec214d0STahsin Erdogan { 314dec214d0STahsin Erdogan return ext4_chksum(sbi, sbi->s_csum_seed, buffer, size); 315dec214d0STahsin Erdogan } 316dec214d0STahsin Erdogan 317dec214d0STahsin Erdogan static u64 ext4_xattr_inode_get_ref(struct inode *ea_inode) 318dec214d0STahsin Erdogan { 319dec214d0STahsin Erdogan return ((u64)ea_inode->i_ctime.tv_sec << 32) | 320ee73f9a5SJeff Layton (u32) inode_peek_iversion_raw(ea_inode); 321dec214d0STahsin Erdogan } 322dec214d0STahsin Erdogan 323dec214d0STahsin Erdogan static void ext4_xattr_inode_set_ref(struct inode *ea_inode, u64 ref_count) 324dec214d0STahsin Erdogan { 325dec214d0STahsin Erdogan ea_inode->i_ctime.tv_sec = (u32)(ref_count >> 32); 326ee73f9a5SJeff Layton inode_set_iversion_raw(ea_inode, ref_count & 0xffffffff); 327dec214d0STahsin Erdogan } 328dec214d0STahsin Erdogan 329dec214d0STahsin Erdogan static u32 ext4_xattr_inode_get_hash(struct inode *ea_inode) 330dec214d0STahsin Erdogan { 331dec214d0STahsin Erdogan return (u32)ea_inode->i_atime.tv_sec; 332dec214d0STahsin Erdogan } 333dec214d0STahsin Erdogan 334dec214d0STahsin Erdogan static void ext4_xattr_inode_set_hash(struct inode *ea_inode, u32 hash) 335dec214d0STahsin Erdogan { 336dec214d0STahsin Erdogan ea_inode->i_atime.tv_sec = hash; 337dec214d0STahsin Erdogan } 338dec214d0STahsin Erdogan 339e50e5129SAndreas Dilger /* 340e50e5129SAndreas Dilger * Read the EA value from an inode. 341e50e5129SAndreas Dilger */ 34290966693STahsin Erdogan static int ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t size) 343e50e5129SAndreas Dilger { 3449699d4f9STahsin Erdogan int blocksize = 1 << ea_inode->i_blkbits; 3459699d4f9STahsin Erdogan int bh_count = (size + blocksize - 1) >> ea_inode->i_blkbits; 3469699d4f9STahsin Erdogan int tail_size = (size % blocksize) ?: blocksize; 3479699d4f9STahsin Erdogan struct buffer_head *bhs_inline[8]; 3489699d4f9STahsin Erdogan struct buffer_head **bhs = bhs_inline; 3499699d4f9STahsin Erdogan int i, ret; 350e50e5129SAndreas Dilger 3519699d4f9STahsin Erdogan if (bh_count > ARRAY_SIZE(bhs_inline)) { 3529699d4f9STahsin Erdogan bhs = kmalloc_array(bh_count, sizeof(*bhs), GFP_NOFS); 3539699d4f9STahsin Erdogan if (!bhs) 3549699d4f9STahsin Erdogan return -ENOMEM; 355e50e5129SAndreas Dilger } 3569699d4f9STahsin Erdogan 3579699d4f9STahsin Erdogan ret = ext4_bread_batch(ea_inode, 0 /* block */, bh_count, 3589699d4f9STahsin Erdogan true /* wait */, bhs); 3599699d4f9STahsin Erdogan if (ret) 3609699d4f9STahsin Erdogan goto free_bhs; 3619699d4f9STahsin Erdogan 3629699d4f9STahsin Erdogan for (i = 0; i < bh_count; i++) { 3639699d4f9STahsin Erdogan /* There shouldn't be any holes in ea_inode. */ 3649699d4f9STahsin Erdogan if (!bhs[i]) { 3659699d4f9STahsin Erdogan ret = -EFSCORRUPTED; 3669699d4f9STahsin Erdogan goto put_bhs; 3679699d4f9STahsin Erdogan } 3689699d4f9STahsin Erdogan memcpy((char *)buf + blocksize * i, bhs[i]->b_data, 3699699d4f9STahsin Erdogan i < bh_count - 1 ? blocksize : tail_size); 3709699d4f9STahsin Erdogan } 3719699d4f9STahsin Erdogan ret = 0; 3729699d4f9STahsin Erdogan put_bhs: 3739699d4f9STahsin Erdogan for (i = 0; i < bh_count; i++) 3749699d4f9STahsin Erdogan brelse(bhs[i]); 3759699d4f9STahsin Erdogan free_bhs: 3769699d4f9STahsin Erdogan if (bhs != bhs_inline) 3779699d4f9STahsin Erdogan kfree(bhs); 3789699d4f9STahsin Erdogan return ret; 379e50e5129SAndreas Dilger } 380e50e5129SAndreas Dilger 381a6d05676STahsin Erdogan #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec) 382a6d05676STahsin Erdogan 383bab79b04STahsin Erdogan static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, 384a6d05676STahsin Erdogan u32 ea_inode_hash, struct inode **ea_inode) 385e50e5129SAndreas Dilger { 386bab79b04STahsin Erdogan struct inode *inode; 387bab79b04STahsin Erdogan int err; 388e50e5129SAndreas Dilger 3898a363970STheodore Ts'o inode = ext4_iget(parent->i_sb, ea_ino, EXT4_IGET_NORMAL); 390bab79b04STahsin Erdogan if (IS_ERR(inode)) { 391bab79b04STahsin Erdogan err = PTR_ERR(inode); 392dec214d0STahsin Erdogan ext4_error(parent->i_sb, 393dec214d0STahsin Erdogan "error while reading EA inode %lu err=%d", ea_ino, 394dec214d0STahsin Erdogan err); 395bab79b04STahsin Erdogan return err; 396e50e5129SAndreas Dilger } 397e50e5129SAndreas Dilger 398bab79b04STahsin Erdogan if (is_bad_inode(inode)) { 399dec214d0STahsin Erdogan ext4_error(parent->i_sb, 400dec214d0STahsin Erdogan "error while reading EA inode %lu is_bad_inode", 401dec214d0STahsin Erdogan ea_ino); 402bab79b04STahsin Erdogan err = -EIO; 403e50e5129SAndreas Dilger goto error; 404e50e5129SAndreas Dilger } 405e50e5129SAndreas Dilger 406bab79b04STahsin Erdogan if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) { 407dec214d0STahsin Erdogan ext4_error(parent->i_sb, 408dec214d0STahsin Erdogan "EA inode %lu does not have EXT4_EA_INODE_FL flag", 409dec214d0STahsin Erdogan ea_ino); 410bab79b04STahsin Erdogan err = -EINVAL; 411e50e5129SAndreas Dilger goto error; 412e50e5129SAndreas Dilger } 413e50e5129SAndreas Dilger 414a6d05676STahsin Erdogan ext4_xattr_inode_set_class(inode); 415a6d05676STahsin Erdogan 416a6d05676STahsin Erdogan /* 417a6d05676STahsin Erdogan * Check whether this is an old Lustre-style xattr inode. Lustre 418a6d05676STahsin Erdogan * implementation does not have hash validation, rather it has a 419a6d05676STahsin Erdogan * backpointer from ea_inode to the parent inode. 420a6d05676STahsin Erdogan */ 421a6d05676STahsin Erdogan if (ea_inode_hash != ext4_xattr_inode_get_hash(inode) && 422a6d05676STahsin Erdogan EXT4_XATTR_INODE_GET_PARENT(inode) == parent->i_ino && 423a6d05676STahsin Erdogan inode->i_generation == parent->i_generation) { 424a6d05676STahsin Erdogan ext4_set_inode_state(inode, EXT4_STATE_LUSTRE_EA_INODE); 425a6d05676STahsin Erdogan ext4_xattr_inode_set_ref(inode, 1); 426a6d05676STahsin Erdogan } else { 427a6d05676STahsin Erdogan inode_lock(inode); 428a6d05676STahsin Erdogan inode->i_flags |= S_NOQUOTA; 429a6d05676STahsin Erdogan inode_unlock(inode); 430a6d05676STahsin Erdogan } 431a6d05676STahsin Erdogan 432bab79b04STahsin Erdogan *ea_inode = inode; 433bab79b04STahsin Erdogan return 0; 434e50e5129SAndreas Dilger error: 435bab79b04STahsin Erdogan iput(inode); 436bab79b04STahsin Erdogan return err; 437e50e5129SAndreas Dilger } 438e50e5129SAndreas Dilger 4396bc0d63dSJan Kara /* Remove entry from mbcache when EA inode is getting evicted */ 4406bc0d63dSJan Kara void ext4_evict_ea_inode(struct inode *inode) 4416bc0d63dSJan Kara { 44265f8b800SJan Kara struct mb_cache_entry *oe; 44365f8b800SJan Kara 44465f8b800SJan Kara if (!EA_INODE_CACHE(inode)) 44565f8b800SJan Kara return; 44665f8b800SJan Kara /* Wait for entry to get unused so that we can remove it */ 44765f8b800SJan Kara while ((oe = mb_cache_entry_delete_or_get(EA_INODE_CACHE(inode), 44865f8b800SJan Kara ext4_xattr_inode_get_hash(inode), inode->i_ino))) { 44965f8b800SJan Kara mb_cache_entry_wait_unused(oe); 45065f8b800SJan Kara mb_cache_entry_put(EA_INODE_CACHE(inode), oe); 45165f8b800SJan Kara } 4526bc0d63dSJan Kara } 4536bc0d63dSJan Kara 454dec214d0STahsin Erdogan static int 455b9fc761eSTahsin Erdogan ext4_xattr_inode_verify_hashes(struct inode *ea_inode, 456b9fc761eSTahsin Erdogan struct ext4_xattr_entry *entry, void *buffer, 457b9fc761eSTahsin Erdogan size_t size) 458dec214d0STahsin Erdogan { 459dec214d0STahsin Erdogan u32 hash; 460dec214d0STahsin Erdogan 461dec214d0STahsin Erdogan /* Verify stored hash matches calculated hash. */ 462dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); 463dec214d0STahsin Erdogan if (hash != ext4_xattr_inode_get_hash(ea_inode)) 464dec214d0STahsin Erdogan return -EFSCORRUPTED; 465b9fc761eSTahsin Erdogan 466b9fc761eSTahsin Erdogan if (entry) { 467b9fc761eSTahsin Erdogan __le32 e_hash, tmp_data; 468b9fc761eSTahsin Erdogan 469b9fc761eSTahsin Erdogan /* Verify entry hash. */ 470b9fc761eSTahsin Erdogan tmp_data = cpu_to_le32(hash); 471b9fc761eSTahsin Erdogan e_hash = ext4_xattr_hash_entry(entry->e_name, entry->e_name_len, 472b9fc761eSTahsin Erdogan &tmp_data, 1); 473b9fc761eSTahsin Erdogan if (e_hash != entry->e_hash) 474b9fc761eSTahsin Erdogan return -EFSCORRUPTED; 475b9fc761eSTahsin Erdogan } 476dec214d0STahsin Erdogan return 0; 477dec214d0STahsin Erdogan } 478dec214d0STahsin Erdogan 479e50e5129SAndreas Dilger /* 480b9fc761eSTahsin Erdogan * Read xattr value from the EA inode. 481e50e5129SAndreas Dilger */ 482e50e5129SAndreas Dilger static int 483b9fc761eSTahsin Erdogan ext4_xattr_inode_get(struct inode *inode, struct ext4_xattr_entry *entry, 484b9fc761eSTahsin Erdogan void *buffer, size_t size) 485e50e5129SAndreas Dilger { 486dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 487bab79b04STahsin Erdogan struct inode *ea_inode; 488dec214d0STahsin Erdogan int err; 489e50e5129SAndreas Dilger 490b9fc761eSTahsin Erdogan err = ext4_xattr_inode_iget(inode, le32_to_cpu(entry->e_value_inum), 491a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), &ea_inode); 492dec214d0STahsin Erdogan if (err) { 493dec214d0STahsin Erdogan ea_inode = NULL; 494dec214d0STahsin Erdogan goto out; 495dec214d0STahsin Erdogan } 496e50e5129SAndreas Dilger 497dec214d0STahsin Erdogan if (i_size_read(ea_inode) != size) { 498dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 499dec214d0STahsin Erdogan "ea_inode file size=%llu entry size=%zu", 500dec214d0STahsin Erdogan i_size_read(ea_inode), size); 501dec214d0STahsin Erdogan err = -EFSCORRUPTED; 502dec214d0STahsin Erdogan goto out; 503dec214d0STahsin Erdogan } 504dec214d0STahsin Erdogan 505dec214d0STahsin Erdogan err = ext4_xattr_inode_read(ea_inode, buffer, size); 506dec214d0STahsin Erdogan if (err) 507dec214d0STahsin Erdogan goto out; 508dec214d0STahsin Erdogan 509a6d05676STahsin Erdogan if (!ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) { 510a6d05676STahsin Erdogan err = ext4_xattr_inode_verify_hashes(ea_inode, entry, buffer, 511a6d05676STahsin Erdogan size); 512a6d05676STahsin Erdogan if (err) { 513dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 514dec214d0STahsin Erdogan "EA inode hash validation failed"); 515dec214d0STahsin Erdogan goto out; 516dec214d0STahsin Erdogan } 517dec214d0STahsin Erdogan 518dec214d0STahsin Erdogan if (ea_inode_cache) 519dec214d0STahsin Erdogan mb_cache_entry_create(ea_inode_cache, GFP_NOFS, 520dec214d0STahsin Erdogan ext4_xattr_inode_get_hash(ea_inode), 521dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 522a6d05676STahsin Erdogan } 523dec214d0STahsin Erdogan out: 524e50e5129SAndreas Dilger iput(ea_inode); 525dec214d0STahsin Erdogan return err; 526e50e5129SAndreas Dilger } 527e50e5129SAndreas Dilger 528ac27a0ecSDave Kleikamp static int 529617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 530ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 531ac27a0ecSDave Kleikamp { 532ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 533617ba13bSMingming Cao struct ext4_xattr_entry *entry; 534ac27a0ecSDave Kleikamp size_t size; 5359496005dSTheodore Ts'o void *end; 536ac27a0ecSDave Kleikamp int error; 53747387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 538ac27a0ecSDave Kleikamp 539ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 540ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 541ac27a0ecSDave Kleikamp 542617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 543fb265c9cSTheodore Ts'o return -ENODATA; 544ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 545ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 546fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 547fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 548fb265c9cSTheodore Ts'o return PTR_ERR(bh); 549ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 550ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 551de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 552de05ca85STheodore Ts'o if (error) 553ac27a0ecSDave Kleikamp goto cleanup; 55447387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bh); 555ac27a0ecSDave Kleikamp entry = BFIRST(bh); 5569496005dSTheodore Ts'o end = bh->b_data + bh->b_size; 5579496005dSTheodore Ts'o error = xattr_find_entry(inode, &entry, end, name_index, name, 1); 558ac27a0ecSDave Kleikamp if (error) 559ac27a0ecSDave Kleikamp goto cleanup; 560ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 561ac27a0ecSDave Kleikamp error = -ERANGE; 56254dd0e0aSTheodore Ts'o if (unlikely(size > EXT4_XATTR_SIZE_MAX)) 56354dd0e0aSTheodore Ts'o goto cleanup; 56454dd0e0aSTheodore Ts'o if (buffer) { 565ac27a0ecSDave Kleikamp if (size > buffer_size) 566ac27a0ecSDave Kleikamp goto cleanup; 567e50e5129SAndreas Dilger if (entry->e_value_inum) { 568b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 569b9fc761eSTahsin Erdogan size); 570e50e5129SAndreas Dilger if (error) 571e50e5129SAndreas Dilger goto cleanup; 572e50e5129SAndreas Dilger } else { 57354dd0e0aSTheodore Ts'o u16 offset = le16_to_cpu(entry->e_value_offs); 57454dd0e0aSTheodore Ts'o void *p = bh->b_data + offset; 57554dd0e0aSTheodore Ts'o 57654dd0e0aSTheodore Ts'o if (unlikely(p + size > end)) 57754dd0e0aSTheodore Ts'o goto cleanup; 57854dd0e0aSTheodore Ts'o memcpy(buffer, p, size); 579e50e5129SAndreas Dilger } 580ac27a0ecSDave Kleikamp } 581ac27a0ecSDave Kleikamp error = size; 582ac27a0ecSDave Kleikamp 583ac27a0ecSDave Kleikamp cleanup: 584ac27a0ecSDave Kleikamp brelse(bh); 585ac27a0ecSDave Kleikamp return error; 586ac27a0ecSDave Kleikamp } 587ac27a0ecSDave Kleikamp 588879b3825STao Ma int 589617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 590ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 591ac27a0ecSDave Kleikamp { 592617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 593617ba13bSMingming Cao struct ext4_xattr_entry *entry; 594617ba13bSMingming Cao struct ext4_inode *raw_inode; 595617ba13bSMingming Cao struct ext4_iloc iloc; 596ac27a0ecSDave Kleikamp size_t size; 597ac27a0ecSDave Kleikamp void *end; 598ac27a0ecSDave Kleikamp int error; 599ac27a0ecSDave Kleikamp 60019f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 601ac27a0ecSDave Kleikamp return -ENODATA; 602617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 603ac27a0ecSDave Kleikamp if (error) 604ac27a0ecSDave Kleikamp return error; 605617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 606ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 607617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 6089e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 609ac27a0ecSDave Kleikamp if (error) 610ac27a0ecSDave Kleikamp goto cleanup; 6116ba644b9SEric Biggers entry = IFIRST(header); 6129496005dSTheodore Ts'o error = xattr_find_entry(inode, &entry, end, name_index, name, 0); 613ac27a0ecSDave Kleikamp if (error) 614ac27a0ecSDave Kleikamp goto cleanup; 615ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 616ac27a0ecSDave Kleikamp error = -ERANGE; 61754dd0e0aSTheodore Ts'o if (unlikely(size > EXT4_XATTR_SIZE_MAX)) 61854dd0e0aSTheodore Ts'o goto cleanup; 61954dd0e0aSTheodore Ts'o if (buffer) { 620ac27a0ecSDave Kleikamp if (size > buffer_size) 621ac27a0ecSDave Kleikamp goto cleanup; 622e50e5129SAndreas Dilger if (entry->e_value_inum) { 623b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 624b9fc761eSTahsin Erdogan size); 625e50e5129SAndreas Dilger if (error) 626e50e5129SAndreas Dilger goto cleanup; 627e50e5129SAndreas Dilger } else { 62854dd0e0aSTheodore Ts'o u16 offset = le16_to_cpu(entry->e_value_offs); 62954dd0e0aSTheodore Ts'o void *p = (void *)IFIRST(header) + offset; 63054dd0e0aSTheodore Ts'o 63154dd0e0aSTheodore Ts'o if (unlikely(p + size > end)) 63254dd0e0aSTheodore Ts'o goto cleanup; 63354dd0e0aSTheodore Ts'o memcpy(buffer, p, size); 634ac27a0ecSDave Kleikamp } 635e50e5129SAndreas Dilger } 636ac27a0ecSDave Kleikamp error = size; 637ac27a0ecSDave Kleikamp 638ac27a0ecSDave Kleikamp cleanup: 639ac27a0ecSDave Kleikamp brelse(iloc.bh); 640ac27a0ecSDave Kleikamp return error; 641ac27a0ecSDave Kleikamp } 642ac27a0ecSDave Kleikamp 643ac27a0ecSDave Kleikamp /* 644617ba13bSMingming Cao * ext4_xattr_get() 645ac27a0ecSDave Kleikamp * 646ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 647ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 648ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 649ac27a0ecSDave Kleikamp * 650ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 651ac27a0ecSDave Kleikamp * used / required on success. 652ac27a0ecSDave Kleikamp */ 653ac27a0ecSDave Kleikamp int 654617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 655ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 656ac27a0ecSDave Kleikamp { 657ac27a0ecSDave Kleikamp int error; 658ac27a0ecSDave Kleikamp 6590db1ff22STheodore Ts'o if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 6600db1ff22STheodore Ts'o return -EIO; 6610db1ff22STheodore Ts'o 662230b8c1aSZhang Zhen if (strlen(name) > 255) 663230b8c1aSZhang Zhen return -ERANGE; 664230b8c1aSZhang Zhen 665617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 666617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 667ac27a0ecSDave Kleikamp buffer_size); 668ac27a0ecSDave Kleikamp if (error == -ENODATA) 669617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 670ac27a0ecSDave Kleikamp buffer_size); 671617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 672ac27a0ecSDave Kleikamp return error; 673ac27a0ecSDave Kleikamp } 674ac27a0ecSDave Kleikamp 675ac27a0ecSDave Kleikamp static int 676431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 677ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 678ac27a0ecSDave Kleikamp { 679ac27a0ecSDave Kleikamp size_t rest = buffer_size; 680ac27a0ecSDave Kleikamp 681617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 68211e27528SStephen Hemminger const struct xattr_handler *handler = 683617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 684ac27a0ecSDave Kleikamp 685764a5c6bSAndreas Gruenbacher if (handler && (!handler->list || handler->list(dentry))) { 686764a5c6bSAndreas Gruenbacher const char *prefix = handler->prefix ?: handler->name; 687764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 688764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 689764a5c6bSAndreas Gruenbacher 690ac27a0ecSDave Kleikamp if (buffer) { 691ac27a0ecSDave Kleikamp if (size > rest) 692ac27a0ecSDave Kleikamp return -ERANGE; 693764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 694764a5c6bSAndreas Gruenbacher buffer += prefix_len; 695764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 696764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 697764a5c6bSAndreas Gruenbacher *buffer++ = 0; 698ac27a0ecSDave Kleikamp } 699ac27a0ecSDave Kleikamp rest -= size; 700ac27a0ecSDave Kleikamp } 701ac27a0ecSDave Kleikamp } 702764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 703ac27a0ecSDave Kleikamp } 704ac27a0ecSDave Kleikamp 705ac27a0ecSDave Kleikamp static int 706431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 707ac27a0ecSDave Kleikamp { 7082b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 709ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 710ac27a0ecSDave Kleikamp int error; 711ac27a0ecSDave Kleikamp 712ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 713ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 714ac27a0ecSDave Kleikamp 715617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 716fb265c9cSTheodore Ts'o return 0; 717ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 718ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 719fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 720fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 721fb265c9cSTheodore Ts'o return PTR_ERR(bh); 722ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 723ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 724de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 725de05ca85STheodore Ts'o if (error) 726ac27a0ecSDave Kleikamp goto cleanup; 72747387409STahsin Erdogan ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); 728fb265c9cSTheodore Ts'o error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, 729fb265c9cSTheodore Ts'o buffer_size); 730ac27a0ecSDave Kleikamp cleanup: 731ac27a0ecSDave Kleikamp brelse(bh); 732ac27a0ecSDave Kleikamp return error; 733ac27a0ecSDave Kleikamp } 734ac27a0ecSDave Kleikamp 735ac27a0ecSDave Kleikamp static int 736431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 737ac27a0ecSDave Kleikamp { 7382b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 739617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 740617ba13bSMingming Cao struct ext4_inode *raw_inode; 741617ba13bSMingming Cao struct ext4_iloc iloc; 742ac27a0ecSDave Kleikamp void *end; 743ac27a0ecSDave Kleikamp int error; 744ac27a0ecSDave Kleikamp 74519f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 746ac27a0ecSDave Kleikamp return 0; 747617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 748ac27a0ecSDave Kleikamp if (error) 749ac27a0ecSDave Kleikamp return error; 750617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 751ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 752617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 7539e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 754ac27a0ecSDave Kleikamp if (error) 755ac27a0ecSDave Kleikamp goto cleanup; 756431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 757ac27a0ecSDave Kleikamp buffer, buffer_size); 758ac27a0ecSDave Kleikamp 759ac27a0ecSDave Kleikamp cleanup: 760ac27a0ecSDave Kleikamp brelse(iloc.bh); 761ac27a0ecSDave Kleikamp return error; 762ac27a0ecSDave Kleikamp } 763ac27a0ecSDave Kleikamp 764ac27a0ecSDave Kleikamp /* 765ba7ea1d8SEric Biggers * Inode operation listxattr() 766ba7ea1d8SEric Biggers * 767ba7ea1d8SEric Biggers * d_inode(dentry)->i_rwsem: don't care 768ac27a0ecSDave Kleikamp * 769ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 770ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 771ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 772ac27a0ecSDave Kleikamp * 773ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 774ac27a0ecSDave Kleikamp * used / required on success. 775ac27a0ecSDave Kleikamp */ 776ba7ea1d8SEric Biggers ssize_t 777ba7ea1d8SEric Biggers ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) 778ac27a0ecSDave Kleikamp { 779eaeef867STheodore Ts'o int ret, ret2; 780ac27a0ecSDave Kleikamp 7812b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 782eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 783eaeef867STheodore Ts'o if (ret < 0) 784eaeef867STheodore Ts'o goto errout; 785ac27a0ecSDave Kleikamp if (buffer) { 786eaeef867STheodore Ts'o buffer += ret; 787eaeef867STheodore Ts'o buffer_size -= ret; 788ac27a0ecSDave Kleikamp } 789eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 790eaeef867STheodore Ts'o if (ret < 0) 791eaeef867STheodore Ts'o goto errout; 792eaeef867STheodore Ts'o ret += ret2; 793eaeef867STheodore Ts'o errout: 7942b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 795eaeef867STheodore Ts'o return ret; 796ac27a0ecSDave Kleikamp } 797ac27a0ecSDave Kleikamp 798ac27a0ecSDave Kleikamp /* 799617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 800ac27a0ecSDave Kleikamp * not set, set it. 801ac27a0ecSDave Kleikamp */ 802617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 803ac27a0ecSDave Kleikamp struct super_block *sb) 804ac27a0ecSDave Kleikamp { 805e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 806ac27a0ecSDave Kleikamp return; 807ac27a0ecSDave Kleikamp 8085d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 809188c299eSJan Kara if (ext4_journal_get_write_access(handle, sb, EXT4_SB(sb)->s_sbh, 810188c299eSJan Kara EXT4_JTR_NONE) == 0) { 81105c2c00fSJan Kara lock_buffer(EXT4_SB(sb)->s_sbh); 812e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 81305c2c00fSJan Kara ext4_superblock_csum_set(sb); 81405c2c00fSJan Kara unlock_buffer(EXT4_SB(sb)->s_sbh); 815a3f5cf14SJan Kara ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); 816ac27a0ecSDave Kleikamp } 817ac27a0ecSDave Kleikamp } 818ac27a0ecSDave Kleikamp 8197a9ca53aSTahsin Erdogan int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) 8207a9ca53aSTahsin Erdogan { 8217a9ca53aSTahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 8227a9ca53aSTahsin Erdogan struct buffer_head *bh = NULL; 8237a9ca53aSTahsin Erdogan struct ext4_inode *raw_inode; 8247a9ca53aSTahsin Erdogan struct ext4_xattr_ibody_header *header; 8257a9ca53aSTahsin Erdogan struct ext4_xattr_entry *entry; 8267a9ca53aSTahsin Erdogan qsize_t ea_inode_refs = 0; 8277a9ca53aSTahsin Erdogan void *end; 8287a9ca53aSTahsin Erdogan int ret; 8297a9ca53aSTahsin Erdogan 8307a9ca53aSTahsin Erdogan lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); 8317a9ca53aSTahsin Erdogan 8327a9ca53aSTahsin Erdogan if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 8337a9ca53aSTahsin Erdogan ret = ext4_get_inode_loc(inode, &iloc); 8347a9ca53aSTahsin Erdogan if (ret) 8357a9ca53aSTahsin Erdogan goto out; 8367a9ca53aSTahsin Erdogan raw_inode = ext4_raw_inode(&iloc); 8377a9ca53aSTahsin Erdogan header = IHDR(inode, raw_inode); 8387a9ca53aSTahsin Erdogan end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 8397a9ca53aSTahsin Erdogan ret = xattr_check_inode(inode, header, end); 8407a9ca53aSTahsin Erdogan if (ret) 8417a9ca53aSTahsin Erdogan goto out; 8427a9ca53aSTahsin Erdogan 8437a9ca53aSTahsin Erdogan for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); 8447a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 8457a9ca53aSTahsin Erdogan if (entry->e_value_inum) 8467a9ca53aSTahsin Erdogan ea_inode_refs++; 8477a9ca53aSTahsin Erdogan } 8487a9ca53aSTahsin Erdogan 8497a9ca53aSTahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 850fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 851fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 852fb265c9cSTheodore Ts'o ret = PTR_ERR(bh); 8537159a986SDan Carpenter bh = NULL; 8547a9ca53aSTahsin Erdogan goto out; 8557a9ca53aSTahsin Erdogan } 8567a9ca53aSTahsin Erdogan 857de05ca85STheodore Ts'o ret = ext4_xattr_check_block(inode, bh); 858de05ca85STheodore Ts'o if (ret) 8597a9ca53aSTahsin Erdogan goto out; 8607a9ca53aSTahsin Erdogan 8617a9ca53aSTahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 8627a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 8637a9ca53aSTahsin Erdogan if (entry->e_value_inum) 8647a9ca53aSTahsin Erdogan ea_inode_refs++; 8657a9ca53aSTahsin Erdogan } 8667a9ca53aSTahsin Erdogan *usage = ea_inode_refs + 1; 8677a9ca53aSTahsin Erdogan ret = 0; 8687a9ca53aSTahsin Erdogan out: 8697a9ca53aSTahsin Erdogan brelse(iloc.bh); 8707a9ca53aSTahsin Erdogan brelse(bh); 8717a9ca53aSTahsin Erdogan return ret; 8727a9ca53aSTahsin Erdogan } 8737a9ca53aSTahsin Erdogan 874dec214d0STahsin Erdogan static inline size_t round_up_cluster(struct inode *inode, size_t length) 875dec214d0STahsin Erdogan { 876dec214d0STahsin Erdogan struct super_block *sb = inode->i_sb; 877dec214d0STahsin Erdogan size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + 878dec214d0STahsin Erdogan inode->i_blkbits); 879dec214d0STahsin Erdogan size_t mask = ~(cluster_size - 1); 880dec214d0STahsin Erdogan 881dec214d0STahsin Erdogan return (length + cluster_size - 1) & mask; 882dec214d0STahsin Erdogan } 883dec214d0STahsin Erdogan 884dec214d0STahsin Erdogan static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) 885dec214d0STahsin Erdogan { 886dec214d0STahsin Erdogan int err; 887dec214d0STahsin Erdogan 888dec214d0STahsin Erdogan err = dquot_alloc_inode(inode); 889dec214d0STahsin Erdogan if (err) 890dec214d0STahsin Erdogan return err; 891dec214d0STahsin Erdogan err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); 892dec214d0STahsin Erdogan if (err) 893dec214d0STahsin Erdogan dquot_free_inode(inode); 894dec214d0STahsin Erdogan return err; 895dec214d0STahsin Erdogan } 896dec214d0STahsin Erdogan 897a6d05676STahsin Erdogan static void ext4_xattr_inode_free_quota(struct inode *parent, 898a6d05676STahsin Erdogan struct inode *ea_inode, 899a6d05676STahsin Erdogan size_t len) 900dec214d0STahsin Erdogan { 901a6d05676STahsin Erdogan if (ea_inode && 902a6d05676STahsin Erdogan ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) 903a6d05676STahsin Erdogan return; 904a6d05676STahsin Erdogan dquot_free_space_nodirty(parent, round_up_cluster(parent, len)); 905a6d05676STahsin Erdogan dquot_free_inode(parent); 906dec214d0STahsin Erdogan } 907dec214d0STahsin Erdogan 908af65207cSTahsin Erdogan int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode, 909af65207cSTahsin Erdogan struct buffer_head *block_bh, size_t value_len, 910af65207cSTahsin Erdogan bool is_create) 911dec214d0STahsin Erdogan { 912dec214d0STahsin Erdogan int credits; 913dec214d0STahsin Erdogan int blocks; 914dec214d0STahsin Erdogan 915dec214d0STahsin Erdogan /* 916dec214d0STahsin Erdogan * 1) Owner inode update 917dec214d0STahsin Erdogan * 2) Ref count update on old xattr block 918dec214d0STahsin Erdogan * 3) new xattr block 919dec214d0STahsin Erdogan * 4) block bitmap update for new xattr block 920dec214d0STahsin Erdogan * 5) group descriptor for new xattr block 921dec214d0STahsin Erdogan * 6) block bitmap update for old xattr block 922dec214d0STahsin Erdogan * 7) group descriptor for old block 923dec214d0STahsin Erdogan * 924dec214d0STahsin Erdogan * 6 & 7 can happen if we have two racing threads T_a and T_b 925dec214d0STahsin Erdogan * which are each trying to set an xattr on inodes I_a and I_b 926dec214d0STahsin Erdogan * which were both initially sharing an xattr block. 927dec214d0STahsin Erdogan */ 928dec214d0STahsin Erdogan credits = 7; 929dec214d0STahsin Erdogan 930dec214d0STahsin Erdogan /* Quota updates. */ 931dec214d0STahsin Erdogan credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); 932dec214d0STahsin Erdogan 933dec214d0STahsin Erdogan /* 934dec214d0STahsin Erdogan * In case of inline data, we may push out the data to a block, 935dec214d0STahsin Erdogan * so we need to reserve credits for this eventuality 936dec214d0STahsin Erdogan */ 937af65207cSTahsin Erdogan if (inode && ext4_has_inline_data(inode)) 938dec214d0STahsin Erdogan credits += ext4_writepage_trans_blocks(inode) + 1; 939dec214d0STahsin Erdogan 940dec214d0STahsin Erdogan /* We are done if ea_inode feature is not enabled. */ 941dec214d0STahsin Erdogan if (!ext4_has_feature_ea_inode(sb)) 942dec214d0STahsin Erdogan return credits; 943dec214d0STahsin Erdogan 944dec214d0STahsin Erdogan /* New ea_inode, inode map, block bitmap, group descriptor. */ 945dec214d0STahsin Erdogan credits += 4; 946dec214d0STahsin Erdogan 947dec214d0STahsin Erdogan /* Data blocks. */ 948dec214d0STahsin Erdogan blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 949dec214d0STahsin Erdogan 950dec214d0STahsin Erdogan /* Indirection block or one level of extent tree. */ 951dec214d0STahsin Erdogan blocks += 1; 952dec214d0STahsin Erdogan 953dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 954dec214d0STahsin Erdogan credits += blocks * 2; 955dec214d0STahsin Erdogan 956dec214d0STahsin Erdogan /* Blocks themselves. */ 957dec214d0STahsin Erdogan credits += blocks; 958dec214d0STahsin Erdogan 959af65207cSTahsin Erdogan if (!is_create) { 960dec214d0STahsin Erdogan /* Dereference ea_inode holding old xattr value. 961dec214d0STahsin Erdogan * Old ea_inode, inode map, block bitmap, group descriptor. 962dec214d0STahsin Erdogan */ 963dec214d0STahsin Erdogan credits += 4; 964dec214d0STahsin Erdogan 965dec214d0STahsin Erdogan /* Data blocks for old ea_inode. */ 966dec214d0STahsin Erdogan blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; 967dec214d0STahsin Erdogan 968af65207cSTahsin Erdogan /* Indirection block or one level of extent tree for old 969af65207cSTahsin Erdogan * ea_inode. 970af65207cSTahsin Erdogan */ 971dec214d0STahsin Erdogan blocks += 1; 972dec214d0STahsin Erdogan 973dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 974dec214d0STahsin Erdogan credits += blocks * 2; 975af65207cSTahsin Erdogan } 976dec214d0STahsin Erdogan 977dec214d0STahsin Erdogan /* We may need to clone the existing xattr block in which case we need 978dec214d0STahsin Erdogan * to increment ref counts for existing ea_inodes referenced by it. 979dec214d0STahsin Erdogan */ 980dec214d0STahsin Erdogan if (block_bh) { 981dec214d0STahsin Erdogan struct ext4_xattr_entry *entry = BFIRST(block_bh); 982dec214d0STahsin Erdogan 983dec214d0STahsin Erdogan for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) 984dec214d0STahsin Erdogan if (entry->e_value_inum) 985dec214d0STahsin Erdogan /* Ref count update on ea_inode. */ 986dec214d0STahsin Erdogan credits += 1; 987dec214d0STahsin Erdogan } 988dec214d0STahsin Erdogan return credits; 989dec214d0STahsin Erdogan } 990dec214d0STahsin Erdogan 991dec214d0STahsin Erdogan static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, 992dec214d0STahsin Erdogan int ref_change) 993dec214d0STahsin Erdogan { 994dec214d0STahsin Erdogan struct ext4_iloc iloc; 995dec214d0STahsin Erdogan s64 ref_count; 996dec214d0STahsin Erdogan int ret; 997dec214d0STahsin Erdogan 998dec214d0STahsin Erdogan inode_lock(ea_inode); 999dec214d0STahsin Erdogan 1000dec214d0STahsin Erdogan ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); 10011bfc204dSVasily Averin if (ret) 1002dec214d0STahsin Erdogan goto out; 1003dec214d0STahsin Erdogan 1004dec214d0STahsin Erdogan ref_count = ext4_xattr_inode_get_ref(ea_inode); 1005dec214d0STahsin Erdogan ref_count += ref_change; 1006dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, ref_count); 1007dec214d0STahsin Erdogan 1008dec214d0STahsin Erdogan if (ref_change > 0) { 1009dec214d0STahsin Erdogan WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", 1010dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1011dec214d0STahsin Erdogan 1012dec214d0STahsin Erdogan if (ref_count == 1) { 1013dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", 1014dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1015dec214d0STahsin Erdogan 1016dec214d0STahsin Erdogan set_nlink(ea_inode, 1); 1017dec214d0STahsin Erdogan ext4_orphan_del(handle, ea_inode); 1018cdb7ee4cSTahsin Erdogan } 1019dec214d0STahsin Erdogan } else { 1020dec214d0STahsin Erdogan WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", 1021dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1022dec214d0STahsin Erdogan 1023dec214d0STahsin Erdogan if (ref_count == 0) { 1024dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink != 1, 1025dec214d0STahsin Erdogan "EA inode %lu i_nlink=%u", 1026dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1027dec214d0STahsin Erdogan 1028dec214d0STahsin Erdogan clear_nlink(ea_inode); 1029dec214d0STahsin Erdogan ext4_orphan_add(handle, ea_inode); 1030dec214d0STahsin Erdogan } 1031cdb7ee4cSTahsin Erdogan } 1032dec214d0STahsin Erdogan 1033dec214d0STahsin Erdogan ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); 1034dec214d0STahsin Erdogan if (ret) 1035dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 1036dec214d0STahsin Erdogan "ext4_mark_iloc_dirty() failed ret=%d", ret); 1037dec214d0STahsin Erdogan out: 1038dec214d0STahsin Erdogan inode_unlock(ea_inode); 1039dec214d0STahsin Erdogan return ret; 1040dec214d0STahsin Erdogan } 1041dec214d0STahsin Erdogan 1042dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) 1043dec214d0STahsin Erdogan { 1044dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, 1); 1045dec214d0STahsin Erdogan } 1046dec214d0STahsin Erdogan 1047dec214d0STahsin Erdogan static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) 1048dec214d0STahsin Erdogan { 1049dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, -1); 1050dec214d0STahsin Erdogan } 1051dec214d0STahsin Erdogan 1052dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, 1053dec214d0STahsin Erdogan struct ext4_xattr_entry *first) 1054dec214d0STahsin Erdogan { 1055dec214d0STahsin Erdogan struct inode *ea_inode; 1056dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 1057dec214d0STahsin Erdogan struct ext4_xattr_entry *failed_entry; 1058dec214d0STahsin Erdogan unsigned int ea_ino; 1059dec214d0STahsin Erdogan int err, saved_err; 1060dec214d0STahsin Erdogan 1061dec214d0STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 1062dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1063dec214d0STahsin Erdogan if (!entry->e_value_inum) 1064dec214d0STahsin Erdogan continue; 1065dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1066a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1067a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1068a6d05676STahsin Erdogan &ea_inode); 1069dec214d0STahsin Erdogan if (err) 1070dec214d0STahsin Erdogan goto cleanup; 1071dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1072dec214d0STahsin Erdogan if (err) { 1073dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "inc ref error %d", err); 1074dec214d0STahsin Erdogan iput(ea_inode); 1075dec214d0STahsin Erdogan goto cleanup; 1076dec214d0STahsin Erdogan } 1077dec214d0STahsin Erdogan iput(ea_inode); 1078dec214d0STahsin Erdogan } 1079dec214d0STahsin Erdogan return 0; 1080dec214d0STahsin Erdogan 1081dec214d0STahsin Erdogan cleanup: 1082dec214d0STahsin Erdogan saved_err = err; 1083dec214d0STahsin Erdogan failed_entry = entry; 1084dec214d0STahsin Erdogan 1085dec214d0STahsin Erdogan for (entry = first; entry != failed_entry; 1086dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1087dec214d0STahsin Erdogan if (!entry->e_value_inum) 1088dec214d0STahsin Erdogan continue; 1089dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1090a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1091a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1092a6d05676STahsin Erdogan &ea_inode); 1093dec214d0STahsin Erdogan if (err) { 1094dec214d0STahsin Erdogan ext4_warning(parent->i_sb, 1095dec214d0STahsin Erdogan "cleanup ea_ino %u iget error %d", ea_ino, 1096dec214d0STahsin Erdogan err); 1097dec214d0STahsin Erdogan continue; 1098dec214d0STahsin Erdogan } 1099dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1100dec214d0STahsin Erdogan if (err) 1101dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "cleanup dec ref error %d", 1102dec214d0STahsin Erdogan err); 1103dec214d0STahsin Erdogan iput(ea_inode); 1104dec214d0STahsin Erdogan } 1105dec214d0STahsin Erdogan return saved_err; 1106dec214d0STahsin Erdogan } 1107dec214d0STahsin Erdogan 1108a4130367SJan Kara static int ext4_xattr_restart_fn(handle_t *handle, struct inode *inode, 1109a4130367SJan Kara struct buffer_head *bh, bool block_csum, bool dirty) 1110a4130367SJan Kara { 1111a4130367SJan Kara int error; 1112a4130367SJan Kara 1113a4130367SJan Kara if (bh && dirty) { 1114a4130367SJan Kara if (block_csum) 1115a4130367SJan Kara ext4_xattr_block_csum_set(inode, bh); 1116a4130367SJan Kara error = ext4_handle_dirty_metadata(handle, NULL, bh); 1117a4130367SJan Kara if (error) { 1118a4130367SJan Kara ext4_warning(inode->i_sb, "Handle metadata (error %d)", 1119a4130367SJan Kara error); 1120a4130367SJan Kara return error; 1121a4130367SJan Kara } 1122a4130367SJan Kara } 1123a4130367SJan Kara return 0; 1124a4130367SJan Kara } 1125a4130367SJan Kara 112630a7eb97STahsin Erdogan static void 1127dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, 112830a7eb97STahsin Erdogan struct buffer_head *bh, 112930a7eb97STahsin Erdogan struct ext4_xattr_entry *first, bool block_csum, 113030a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1131dec214d0STahsin Erdogan int extra_credits, bool skip_quota) 113230a7eb97STahsin Erdogan { 113330a7eb97STahsin Erdogan struct inode *ea_inode; 113430a7eb97STahsin Erdogan struct ext4_xattr_entry *entry; 113530a7eb97STahsin Erdogan bool dirty = false; 113630a7eb97STahsin Erdogan unsigned int ea_ino; 113730a7eb97STahsin Erdogan int err; 113830a7eb97STahsin Erdogan int credits; 113930a7eb97STahsin Erdogan 114030a7eb97STahsin Erdogan /* One credit for dec ref on ea_inode, one for orphan list addition, */ 114130a7eb97STahsin Erdogan credits = 2 + extra_credits; 114230a7eb97STahsin Erdogan 114330a7eb97STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 114430a7eb97STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 114530a7eb97STahsin Erdogan if (!entry->e_value_inum) 114630a7eb97STahsin Erdogan continue; 114730a7eb97STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1148a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1149a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1150a6d05676STahsin Erdogan &ea_inode); 115130a7eb97STahsin Erdogan if (err) 115230a7eb97STahsin Erdogan continue; 115330a7eb97STahsin Erdogan 115430a7eb97STahsin Erdogan err = ext4_expand_inode_array(ea_inode_array, ea_inode); 115530a7eb97STahsin Erdogan if (err) { 115630a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, 115730a7eb97STahsin Erdogan "Expand inode array err=%d", err); 115830a7eb97STahsin Erdogan iput(ea_inode); 115930a7eb97STahsin Erdogan continue; 116030a7eb97STahsin Erdogan } 116130a7eb97STahsin Erdogan 1162a4130367SJan Kara err = ext4_journal_ensure_credits_fn(handle, credits, credits, 116383448bdfSJan Kara ext4_free_metadata_revoke_credits(parent->i_sb, 1), 1164a4130367SJan Kara ext4_xattr_restart_fn(handle, parent, bh, block_csum, 1165a4130367SJan Kara dirty)); 1166a4130367SJan Kara if (err < 0) { 116730a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, "Ensure credits err=%d", 116830a7eb97STahsin Erdogan err); 116930a7eb97STahsin Erdogan continue; 117030a7eb97STahsin Erdogan } 1171a4130367SJan Kara if (err > 0) { 1172188c299eSJan Kara err = ext4_journal_get_write_access(handle, 1173188c299eSJan Kara parent->i_sb, bh, EXT4_JTR_NONE); 1174a4130367SJan Kara if (err) { 1175a4130367SJan Kara ext4_warning_inode(ea_inode, 1176a4130367SJan Kara "Re-get write access err=%d", 1177a4130367SJan Kara err); 1178a4130367SJan Kara continue; 1179a4130367SJan Kara } 1180a4130367SJan Kara } 118130a7eb97STahsin Erdogan 1182dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1183dec214d0STahsin Erdogan if (err) { 1184dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", 1185dec214d0STahsin Erdogan err); 1186dec214d0STahsin Erdogan continue; 1187dec214d0STahsin Erdogan } 1188dec214d0STahsin Erdogan 1189dec214d0STahsin Erdogan if (!skip_quota) 1190a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(parent, ea_inode, 1191dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 119230a7eb97STahsin Erdogan 119330a7eb97STahsin Erdogan /* 119430a7eb97STahsin Erdogan * Forget about ea_inode within the same transaction that 119530a7eb97STahsin Erdogan * decrements the ref count. This avoids duplicate decrements in 119630a7eb97STahsin Erdogan * case the rest of the work spills over to subsequent 119730a7eb97STahsin Erdogan * transactions. 119830a7eb97STahsin Erdogan */ 119930a7eb97STahsin Erdogan entry->e_value_inum = 0; 120030a7eb97STahsin Erdogan entry->e_value_size = 0; 120130a7eb97STahsin Erdogan 120230a7eb97STahsin Erdogan dirty = true; 120330a7eb97STahsin Erdogan } 120430a7eb97STahsin Erdogan 120530a7eb97STahsin Erdogan if (dirty) { 120630a7eb97STahsin Erdogan /* 120730a7eb97STahsin Erdogan * Note that we are deliberately skipping csum calculation for 120830a7eb97STahsin Erdogan * the final update because we do not expect any journal 120930a7eb97STahsin Erdogan * restarts until xattr block is freed. 121030a7eb97STahsin Erdogan */ 121130a7eb97STahsin Erdogan 121230a7eb97STahsin Erdogan err = ext4_handle_dirty_metadata(handle, NULL, bh); 121330a7eb97STahsin Erdogan if (err) 121430a7eb97STahsin Erdogan ext4_warning_inode(parent, 121530a7eb97STahsin Erdogan "handle dirty metadata err=%d", err); 121630a7eb97STahsin Erdogan } 121730a7eb97STahsin Erdogan } 121830a7eb97STahsin Erdogan 1219ac27a0ecSDave Kleikamp /* 1220ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 1221ec4cb1aaSJan Kara * otherwise free the block. 1222ac27a0ecSDave Kleikamp */ 1223ac27a0ecSDave Kleikamp static void 1224617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 1225dec214d0STahsin Erdogan struct buffer_head *bh, 1226dec214d0STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1227dec214d0STahsin Erdogan int extra_credits) 1228ac27a0ecSDave Kleikamp { 122947387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 12306048c64bSAndreas Gruenbacher u32 hash, ref; 12318a2bfdcbSMingming Cao int error = 0; 1232ac27a0ecSDave Kleikamp 12335d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 1234188c299eSJan Kara error = ext4_journal_get_write_access(handle, inode->i_sb, bh, 1235188c299eSJan Kara EXT4_JTR_NONE); 12368a2bfdcbSMingming Cao if (error) 12378a2bfdcbSMingming Cao goto out; 12388a2bfdcbSMingming Cao 123965f8b800SJan Kara retry_ref: 12408a2bfdcbSMingming Cao lock_buffer(bh); 12416048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 12426048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 12436048c64bSAndreas Gruenbacher if (ref == 1) { 1244ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 124582939d79SJan Kara /* 124682939d79SJan Kara * This must happen under buffer lock for 124782939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 124882939d79SJan Kara */ 124965f8b800SJan Kara if (ea_block_cache) { 125065f8b800SJan Kara struct mb_cache_entry *oe; 125165f8b800SJan Kara 125265f8b800SJan Kara oe = mb_cache_entry_delete_or_get(ea_block_cache, hash, 1253cdb7ee4cSTahsin Erdogan bh->b_blocknr); 125465f8b800SJan Kara if (oe) { 125565f8b800SJan Kara unlock_buffer(bh); 125665f8b800SJan Kara mb_cache_entry_wait_unused(oe); 125765f8b800SJan Kara mb_cache_entry_put(ea_block_cache, oe); 125865f8b800SJan Kara goto retry_ref; 125965f8b800SJan Kara } 126065f8b800SJan Kara } 1261ac27a0ecSDave Kleikamp get_bh(bh); 1262ec4cb1aaSJan Kara unlock_buffer(bh); 1263dec214d0STahsin Erdogan 1264dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) 1265dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, bh, 1266dec214d0STahsin Erdogan BFIRST(bh), 1267dec214d0STahsin Erdogan true /* block_csum */, 1268dec214d0STahsin Erdogan ea_inode_array, 1269dec214d0STahsin Erdogan extra_credits, 1270dec214d0STahsin Erdogan true /* skip_quota */); 1271e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 1272e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 1273e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 1274ac27a0ecSDave Kleikamp } else { 12756048c64bSAndreas Gruenbacher ref--; 12766048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 12776048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 12786048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 12796048c64bSAndreas Gruenbacher 1280cdb7ee4cSTahsin Erdogan if (ea_block_cache) { 128147387409STahsin Erdogan ce = mb_cache_entry_get(ea_block_cache, hash, 12826048c64bSAndreas Gruenbacher bh->b_blocknr); 12836048c64bSAndreas Gruenbacher if (ce) { 12846048c64bSAndreas Gruenbacher ce->e_reusable = 1; 128547387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 12866048c64bSAndreas Gruenbacher } 12876048c64bSAndreas Gruenbacher } 1288cdb7ee4cSTahsin Erdogan } 12896048c64bSAndreas Gruenbacher 1290dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bh); 1291ec4cb1aaSJan Kara /* 1292ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 1293ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 1294ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 1295ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 1296ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 1297dac7a4b4STheodore Ts'o * call ext4_handle_dirty_metadata() with locked buffer as 1298ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 1299ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 1300ec4cb1aaSJan Kara */ 1301ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 1302dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1303c1bb05a6SEric Sandeen unlock_buffer(bh); 1304ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 1305dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1306ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 13070390131bSFrank Mayhar ext4_handle_sync(handle); 13081231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 1309ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 1310ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 1311ac27a0ecSDave Kleikamp } 13128a2bfdcbSMingming Cao out: 13138a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 13148a2bfdcbSMingming Cao return; 1315ac27a0ecSDave Kleikamp } 1316ac27a0ecSDave Kleikamp 13176dd4ee7cSKalpak Shah /* 13186dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 13196dd4ee7cSKalpak Shah * bytes used by EA entries. 13206dd4ee7cSKalpak Shah */ 13216dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 13226dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 13236dd4ee7cSKalpak Shah { 13246dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1325e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 13266dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 13276dd4ee7cSKalpak Shah if (offs < *min_offs) 13286dd4ee7cSKalpak Shah *min_offs = offs; 13296dd4ee7cSKalpak Shah } 13307b1b2c1bSTheodore Ts'o if (total) 13317b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 13326dd4ee7cSKalpak Shah } 13336dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 13346dd4ee7cSKalpak Shah } 13356dd4ee7cSKalpak Shah 1336e50e5129SAndreas Dilger /* 1337e50e5129SAndreas Dilger * Write the value of the EA in an inode. 1338e50e5129SAndreas Dilger */ 1339e50e5129SAndreas Dilger static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, 1340e50e5129SAndreas Dilger const void *buf, int bufsize) 1341e50e5129SAndreas Dilger { 1342e50e5129SAndreas Dilger struct buffer_head *bh = NULL; 1343e50e5129SAndreas Dilger unsigned long block = 0; 1344dec214d0STahsin Erdogan int blocksize = ea_inode->i_sb->s_blocksize; 1345dec214d0STahsin Erdogan int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; 1346e50e5129SAndreas Dilger int csize, wsize = 0; 13474209ae12SHarshad Shirwadkar int ret = 0, ret2 = 0; 1348e50e5129SAndreas Dilger int retries = 0; 1349e50e5129SAndreas Dilger 1350e50e5129SAndreas Dilger retry: 1351e50e5129SAndreas Dilger while (ret >= 0 && ret < max_blocks) { 1352e50e5129SAndreas Dilger struct ext4_map_blocks map; 1353e50e5129SAndreas Dilger map.m_lblk = block += ret; 1354e50e5129SAndreas Dilger map.m_len = max_blocks -= ret; 1355e50e5129SAndreas Dilger 1356e50e5129SAndreas Dilger ret = ext4_map_blocks(handle, ea_inode, &map, 1357e50e5129SAndreas Dilger EXT4_GET_BLOCKS_CREATE); 1358e50e5129SAndreas Dilger if (ret <= 0) { 1359e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1360e50e5129SAndreas Dilger if (ret == -ENOSPC && 1361e50e5129SAndreas Dilger ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { 1362e50e5129SAndreas Dilger ret = 0; 1363e50e5129SAndreas Dilger goto retry; 1364e50e5129SAndreas Dilger } 1365e50e5129SAndreas Dilger break; 1366e50e5129SAndreas Dilger } 1367e50e5129SAndreas Dilger } 1368e50e5129SAndreas Dilger 1369e50e5129SAndreas Dilger if (ret < 0) 1370e50e5129SAndreas Dilger return ret; 1371e50e5129SAndreas Dilger 1372e50e5129SAndreas Dilger block = 0; 1373e50e5129SAndreas Dilger while (wsize < bufsize) { 1374e50e5129SAndreas Dilger brelse(bh); 1375e50e5129SAndreas Dilger csize = (bufsize - wsize) > blocksize ? blocksize : 1376e50e5129SAndreas Dilger bufsize - wsize; 1377e50e5129SAndreas Dilger bh = ext4_getblk(handle, ea_inode, block, 0); 1378e50e5129SAndreas Dilger if (IS_ERR(bh)) 1379e50e5129SAndreas Dilger return PTR_ERR(bh); 1380eb6984faSVasily Averin if (!bh) { 1381eb6984faSVasily Averin WARN_ON_ONCE(1); 1382eb6984faSVasily Averin EXT4_ERROR_INODE(ea_inode, 1383eb6984faSVasily Averin "ext4_getblk() return bh = NULL"); 1384eb6984faSVasily Averin return -EFSCORRUPTED; 1385eb6984faSVasily Averin } 1386188c299eSJan Kara ret = ext4_journal_get_write_access(handle, ea_inode->i_sb, bh, 1387188c299eSJan Kara EXT4_JTR_NONE); 1388e50e5129SAndreas Dilger if (ret) 1389e50e5129SAndreas Dilger goto out; 1390e50e5129SAndreas Dilger 1391e50e5129SAndreas Dilger memcpy(bh->b_data, buf, csize); 1392e50e5129SAndreas Dilger set_buffer_uptodate(bh); 1393e50e5129SAndreas Dilger ext4_handle_dirty_metadata(handle, ea_inode, bh); 1394e50e5129SAndreas Dilger 1395e50e5129SAndreas Dilger buf += csize; 1396e50e5129SAndreas Dilger wsize += csize; 1397e50e5129SAndreas Dilger block += 1; 1398e50e5129SAndreas Dilger } 1399e50e5129SAndreas Dilger 1400e50e5129SAndreas Dilger inode_lock(ea_inode); 1401e50e5129SAndreas Dilger i_size_write(ea_inode, wsize); 1402e50e5129SAndreas Dilger ext4_update_i_disksize(ea_inode, wsize); 1403e50e5129SAndreas Dilger inode_unlock(ea_inode); 1404e50e5129SAndreas Dilger 14054209ae12SHarshad Shirwadkar ret2 = ext4_mark_inode_dirty(handle, ea_inode); 14064209ae12SHarshad Shirwadkar if (unlikely(ret2 && !ret)) 14074209ae12SHarshad Shirwadkar ret = ret2; 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 1478163f0ec1SJan Kara WARN_ON_ONCE(ext4_handle_valid(journal_current_handle()) && 1479163f0ec1SJan Kara !(current->flags & PF_MEMALLOC_NOFS)); 1480163f0ec1SJan Kara 148171b565ceSTheodore Ts'o ea_data = kvmalloc(value_len, GFP_KERNEL); 1482dec214d0STahsin Erdogan if (!ea_data) { 1483dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1484dec214d0STahsin Erdogan return NULL; 1485dec214d0STahsin Erdogan } 1486dec214d0STahsin Erdogan 1487dec214d0STahsin Erdogan while (ce) { 14888a363970STheodore Ts'o ea_inode = ext4_iget(inode->i_sb, ce->e_value, 14898a363970STheodore Ts'o EXT4_IGET_NORMAL); 1490dec214d0STahsin Erdogan if (!IS_ERR(ea_inode) && 1491dec214d0STahsin Erdogan !is_bad_inode(ea_inode) && 1492dec214d0STahsin Erdogan (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && 1493dec214d0STahsin Erdogan i_size_read(ea_inode) == value_len && 1494dec214d0STahsin Erdogan !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && 1495b9fc761eSTahsin Erdogan !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, 1496dec214d0STahsin Erdogan value_len) && 1497dec214d0STahsin Erdogan !memcmp(value, ea_data, value_len)) { 1498dec214d0STahsin Erdogan mb_cache_entry_touch(ea_inode_cache, ce); 1499dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1500dec214d0STahsin Erdogan kvfree(ea_data); 1501dec214d0STahsin Erdogan return ea_inode; 1502dec214d0STahsin Erdogan } 1503dec214d0STahsin Erdogan 1504dec214d0STahsin Erdogan if (!IS_ERR(ea_inode)) 1505e50e5129SAndreas Dilger iput(ea_inode); 1506dec214d0STahsin Erdogan ce = mb_cache_entry_find_next(ea_inode_cache, ce); 1507dec214d0STahsin Erdogan } 1508dec214d0STahsin Erdogan kvfree(ea_data); 1509dec214d0STahsin Erdogan return NULL; 1510e50e5129SAndreas Dilger } 1511e50e5129SAndreas Dilger 1512e50e5129SAndreas Dilger /* 1513e50e5129SAndreas Dilger * Add value of the EA in an inode. 1514e50e5129SAndreas Dilger */ 1515dec214d0STahsin Erdogan static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, 1516dec214d0STahsin Erdogan const void *value, size_t value_len, 1517dec214d0STahsin Erdogan struct inode **ret_inode) 1518e50e5129SAndreas Dilger { 1519e50e5129SAndreas Dilger struct inode *ea_inode; 1520dec214d0STahsin Erdogan u32 hash; 1521e50e5129SAndreas Dilger int err; 1522e50e5129SAndreas Dilger 1523dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); 1524dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); 1525dec214d0STahsin Erdogan if (ea_inode) { 1526dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1527dec214d0STahsin Erdogan if (err) { 1528dec214d0STahsin Erdogan iput(ea_inode); 1529dec214d0STahsin Erdogan return err; 1530dec214d0STahsin Erdogan } 1531dec214d0STahsin Erdogan 1532dec214d0STahsin Erdogan *ret_inode = ea_inode; 1533dec214d0STahsin Erdogan return 0; 1534dec214d0STahsin Erdogan } 1535dec214d0STahsin Erdogan 1536e50e5129SAndreas Dilger /* Create an inode for the EA value */ 1537dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_create(handle, inode, hash); 1538e50e5129SAndreas Dilger if (IS_ERR(ea_inode)) 1539e50e5129SAndreas Dilger return PTR_ERR(ea_inode); 1540e50e5129SAndreas Dilger 1541e50e5129SAndreas Dilger err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); 1542dec214d0STahsin Erdogan if (err) { 1543*56d0d0b9SLi Zhong if (ext4_xattr_inode_dec_ref(handle, ea_inode)) 1544*56d0d0b9SLi Zhong ext4_warning_inode(ea_inode, "cleanup dec ref error %d", err); 1545e50e5129SAndreas Dilger iput(ea_inode); 1546e50e5129SAndreas Dilger return err; 1547e50e5129SAndreas Dilger } 1548e50e5129SAndreas Dilger 1549cdb7ee4cSTahsin Erdogan if (EA_INODE_CACHE(inode)) 1550dec214d0STahsin Erdogan mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, 1551dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 1552dec214d0STahsin Erdogan 1553dec214d0STahsin Erdogan *ret_inode = ea_inode; 1554dec214d0STahsin Erdogan return 0; 1555dec214d0STahsin Erdogan } 1556dec214d0STahsin Erdogan 15579c6e7853STahsin Erdogan /* 15589c6e7853STahsin Erdogan * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode 15599c6e7853STahsin Erdogan * feature is enabled. 15609c6e7853STahsin Erdogan */ 15619c6e7853STahsin Erdogan #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) 15629c6e7853STahsin Erdogan 1563e50e5129SAndreas Dilger static int ext4_xattr_set_entry(struct ext4_xattr_info *i, 1564e50e5129SAndreas Dilger struct ext4_xattr_search *s, 1565daf83281STahsin Erdogan handle_t *handle, struct inode *inode, 1566daf83281STahsin Erdogan bool is_block) 1567ac27a0ecSDave Kleikamp { 15685369a762STheodore Ts'o struct ext4_xattr_entry *last, *next; 1569dec214d0STahsin Erdogan struct ext4_xattr_entry *here = s->here; 1570dec214d0STahsin Erdogan size_t min_offs = s->end - s->base, name_len = strlen(i->name); 1571e50e5129SAndreas Dilger int in_inode = i->in_inode; 1572dec214d0STahsin Erdogan struct inode *old_ea_inode = NULL; 1573dec214d0STahsin Erdogan struct inode *new_ea_inode = NULL; 1574dec214d0STahsin Erdogan size_t old_size, new_size; 1575dec214d0STahsin Erdogan int ret; 1576dec214d0STahsin Erdogan 1577dec214d0STahsin Erdogan /* Space used by old and new values. */ 1578dec214d0STahsin Erdogan old_size = (!s->not_found && !here->e_value_inum) ? 1579dec214d0STahsin Erdogan EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; 1580dec214d0STahsin Erdogan new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; 1581dec214d0STahsin Erdogan 1582dec214d0STahsin Erdogan /* 1583dec214d0STahsin Erdogan * Optimization for the simple case when old and new values have the 1584dec214d0STahsin Erdogan * same padded sizes. Not applicable if external inodes are involved. 1585dec214d0STahsin Erdogan */ 1586dec214d0STahsin Erdogan if (new_size && new_size == old_size) { 1587dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1588dec214d0STahsin Erdogan void *val = s->base + offs; 1589dec214d0STahsin Erdogan 1590dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1591dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1592dec214d0STahsin Erdogan memset(val, 0, new_size); 1593dec214d0STahsin Erdogan } else { 1594dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1595dec214d0STahsin Erdogan /* Clear padding bytes. */ 1596dec214d0STahsin Erdogan memset(val + i->value_len, 0, new_size - i->value_len); 1597dec214d0STahsin Erdogan } 159832aaf194STahsin Erdogan goto update_hash; 1599dec214d0STahsin Erdogan } 1600e50e5129SAndreas Dilger 1601ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 1602ac27a0ecSDave Kleikamp last = s->first; 16035369a762STheodore Ts'o for (; !IS_LAST_ENTRY(last); last = next) { 16045369a762STheodore Ts'o next = EXT4_XATTR_NEXT(last); 16055369a762STheodore Ts'o if ((void *)next >= s->end) { 16065369a762STheodore Ts'o EXT4_ERROR_INODE(inode, "corrupted xattr entries"); 16075369a762STheodore Ts'o ret = -EFSCORRUPTED; 16085369a762STheodore Ts'o goto out; 16095369a762STheodore Ts'o } 1610e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 1611ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 1612ac27a0ecSDave Kleikamp if (offs < min_offs) 1613ac27a0ecSDave Kleikamp min_offs = offs; 1614ac27a0ecSDave Kleikamp } 1615ac27a0ecSDave Kleikamp } 1616dec214d0STahsin Erdogan 1617dec214d0STahsin Erdogan /* Check whether we have enough space. */ 1618ac27a0ecSDave Kleikamp if (i->value) { 1619dec214d0STahsin Erdogan size_t free; 1620e50e5129SAndreas Dilger 1621dec214d0STahsin Erdogan free = min_offs - ((void *)last - s->base) - sizeof(__u32); 1622dec214d0STahsin Erdogan if (!s->not_found) 1623dec214d0STahsin Erdogan free += EXT4_XATTR_LEN(name_len) + old_size; 1624e50e5129SAndreas Dilger 1625dec214d0STahsin Erdogan if (free < EXT4_XATTR_LEN(name_len) + new_size) { 1626dec214d0STahsin Erdogan ret = -ENOSPC; 1627dec214d0STahsin Erdogan goto out; 1628dec214d0STahsin Erdogan } 16299c6e7853STahsin Erdogan 16309c6e7853STahsin Erdogan /* 16319c6e7853STahsin Erdogan * If storing the value in an external inode is an option, 16329c6e7853STahsin Erdogan * reserve space for xattr entries/names in the external 16339c6e7853STahsin Erdogan * attribute block so that a long value does not occupy the 16343088e5a5SBhaskar Chowdhury * whole space and prevent further entries being added. 16359c6e7853STahsin Erdogan */ 1636daf83281STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 1637daf83281STahsin Erdogan new_size && is_block && 16389c6e7853STahsin Erdogan (min_offs + old_size - new_size) < 16399c6e7853STahsin Erdogan EXT4_XATTR_BLOCK_RESERVE(inode)) { 16409c6e7853STahsin Erdogan ret = -ENOSPC; 16419c6e7853STahsin Erdogan goto out; 16429c6e7853STahsin Erdogan } 1643ac27a0ecSDave Kleikamp } 1644ac27a0ecSDave Kleikamp 1645dec214d0STahsin Erdogan /* 1646dec214d0STahsin Erdogan * Getting access to old and new ea inodes is subject to failures. 1647dec214d0STahsin Erdogan * Finish that work before doing any modifications to the xattr data. 1648dec214d0STahsin Erdogan */ 1649dec214d0STahsin Erdogan if (!s->not_found && here->e_value_inum) { 1650dec214d0STahsin Erdogan ret = ext4_xattr_inode_iget(inode, 1651dec214d0STahsin Erdogan le32_to_cpu(here->e_value_inum), 1652a6d05676STahsin Erdogan le32_to_cpu(here->e_hash), 1653dec214d0STahsin Erdogan &old_ea_inode); 1654dec214d0STahsin Erdogan if (ret) { 1655dec214d0STahsin Erdogan old_ea_inode = NULL; 1656dec214d0STahsin Erdogan goto out; 1657bd9926e8STheodore Ts'o } 1658dec214d0STahsin Erdogan } 1659dec214d0STahsin Erdogan if (i->value && in_inode) { 1660dec214d0STahsin Erdogan WARN_ON_ONCE(!i->value_len); 1661dec214d0STahsin Erdogan 1662dec214d0STahsin Erdogan ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); 1663dec214d0STahsin Erdogan if (ret) 1664dec214d0STahsin Erdogan goto out; 1665dec214d0STahsin Erdogan 1666dec214d0STahsin Erdogan ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, 1667dec214d0STahsin Erdogan i->value_len, 1668dec214d0STahsin Erdogan &new_ea_inode); 1669dec214d0STahsin Erdogan if (ret) { 1670dec214d0STahsin Erdogan new_ea_inode = NULL; 1671a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, NULL, i->value_len); 1672dec214d0STahsin Erdogan goto out; 1673dec214d0STahsin Erdogan } 1674ac27a0ecSDave Kleikamp } 1675ac27a0ecSDave Kleikamp 1676dec214d0STahsin Erdogan if (old_ea_inode) { 1677dec214d0STahsin Erdogan /* We are ready to release ref count on the old_ea_inode. */ 1678dec214d0STahsin Erdogan ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); 1679dec214d0STahsin Erdogan if (ret) { 1680dec214d0STahsin Erdogan /* Release newly required ref count on new_ea_inode. */ 1681dec214d0STahsin Erdogan if (new_ea_inode) { 1682dec214d0STahsin Erdogan int err; 1683dec214d0STahsin Erdogan 1684dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, 1685dec214d0STahsin Erdogan new_ea_inode); 1686dec214d0STahsin Erdogan if (err) 1687dec214d0STahsin Erdogan ext4_warning_inode(new_ea_inode, 1688dec214d0STahsin Erdogan "dec ref new_ea_inode err=%d", 1689dec214d0STahsin Erdogan err); 1690a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, new_ea_inode, 1691dec214d0STahsin Erdogan i->value_len); 1692dec214d0STahsin Erdogan } 1693dec214d0STahsin Erdogan goto out; 1694dec214d0STahsin Erdogan } 1695dec214d0STahsin Erdogan 1696a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, old_ea_inode, 1697dec214d0STahsin Erdogan le32_to_cpu(here->e_value_size)); 1698dec214d0STahsin Erdogan } 1699dec214d0STahsin Erdogan 1700dec214d0STahsin Erdogan /* No failures allowed past this point. */ 1701dec214d0STahsin Erdogan 1702e5d01196STheodore Ts'o if (!s->not_found && here->e_value_size && !here->e_value_inum) { 1703ac27a0ecSDave Kleikamp /* Remove the old value. */ 1704dec214d0STahsin Erdogan void *first_val = s->base + min_offs; 1705dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1706dec214d0STahsin Erdogan void *val = s->base + offs; 1707dec214d0STahsin Erdogan 1708dec214d0STahsin Erdogan memmove(first_val + old_size, first_val, val - first_val); 1709dec214d0STahsin Erdogan memset(first_val, 0, old_size); 1710dec214d0STahsin Erdogan min_offs += old_size; 1711ac27a0ecSDave Kleikamp 1712ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 1713ac27a0ecSDave Kleikamp last = s->first; 1714ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 1715ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 1716dec214d0STahsin Erdogan 1717e50e5129SAndreas Dilger if (!last->e_value_inum && 1718e50e5129SAndreas Dilger last->e_value_size && o < offs) 1719dec214d0STahsin Erdogan last->e_value_offs = cpu_to_le16(o + old_size); 1720617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 1721ac27a0ecSDave Kleikamp } 1722ac27a0ecSDave Kleikamp } 1723dec214d0STahsin Erdogan 1724ac27a0ecSDave Kleikamp if (!i->value) { 1725dec214d0STahsin Erdogan /* Remove old name. */ 1726617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 1727dec214d0STahsin Erdogan 1728ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 1729dec214d0STahsin Erdogan memmove(here, (void *)here + size, 1730dec214d0STahsin Erdogan (void *)last - (void *)here + sizeof(__u32)); 1731ac27a0ecSDave Kleikamp memset(last, 0, size); 1732dec214d0STahsin Erdogan } else if (s->not_found) { 1733dec214d0STahsin Erdogan /* Insert new name. */ 1734dec214d0STahsin Erdogan size_t size = EXT4_XATTR_LEN(name_len); 1735dec214d0STahsin Erdogan size_t rest = (void *)last - (void *)here + sizeof(__u32); 1736dec214d0STahsin Erdogan 1737dec214d0STahsin Erdogan memmove((void *)here + size, here, rest); 1738dec214d0STahsin Erdogan memset(here, 0, size); 1739dec214d0STahsin Erdogan here->e_name_index = i->name_index; 1740dec214d0STahsin Erdogan here->e_name_len = name_len; 1741dec214d0STahsin Erdogan memcpy(here->e_name, i->name, name_len); 1742dec214d0STahsin Erdogan } else { 1743dec214d0STahsin Erdogan /* This is an update, reset value info. */ 1744dec214d0STahsin Erdogan here->e_value_inum = 0; 1745dec214d0STahsin Erdogan here->e_value_offs = 0; 1746dec214d0STahsin Erdogan here->e_value_size = 0; 1747ac27a0ecSDave Kleikamp } 1748ac27a0ecSDave Kleikamp 1749ac27a0ecSDave Kleikamp if (i->value) { 1750dec214d0STahsin Erdogan /* Insert new value. */ 1751e50e5129SAndreas Dilger if (in_inode) { 1752dec214d0STahsin Erdogan here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); 1753e50e5129SAndreas Dilger } else if (i->value_len) { 1754dec214d0STahsin Erdogan void *val = s->base + min_offs - new_size; 1755e50e5129SAndreas Dilger 1756dec214d0STahsin Erdogan here->e_value_offs = cpu_to_le16(min_offs - new_size); 1757dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1758dec214d0STahsin Erdogan memset(val, 0, new_size); 1759dec214d0STahsin Erdogan } else { 1760dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1761dec214d0STahsin Erdogan /* Clear padding bytes. */ 1762dec214d0STahsin Erdogan memset(val + i->value_len, 0, 1763dec214d0STahsin Erdogan new_size - i->value_len); 1764dec214d0STahsin Erdogan } 1765dec214d0STahsin Erdogan } 1766dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1767dec214d0STahsin Erdogan } 1768daf83281STahsin Erdogan 176932aaf194STahsin Erdogan update_hash: 1770b9fc761eSTahsin Erdogan if (i->value) { 1771b9fc761eSTahsin Erdogan __le32 hash = 0; 1772b9fc761eSTahsin Erdogan 1773b9fc761eSTahsin Erdogan /* Entry hash calculation. */ 1774b9fc761eSTahsin Erdogan if (in_inode) { 1775b9fc761eSTahsin Erdogan __le32 crc32c_hash; 1776b9fc761eSTahsin Erdogan 1777b9fc761eSTahsin Erdogan /* 1778b9fc761eSTahsin Erdogan * Feed crc32c hash instead of the raw value for entry 1779b9fc761eSTahsin Erdogan * hash calculation. This is to avoid walking 1780b9fc761eSTahsin Erdogan * potentially long value buffer again. 1781b9fc761eSTahsin Erdogan */ 1782b9fc761eSTahsin Erdogan crc32c_hash = cpu_to_le32( 1783b9fc761eSTahsin Erdogan ext4_xattr_inode_get_hash(new_ea_inode)); 1784b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1785b9fc761eSTahsin Erdogan here->e_name_len, 1786b9fc761eSTahsin Erdogan &crc32c_hash, 1); 1787b9fc761eSTahsin Erdogan } else if (is_block) { 178832aaf194STahsin Erdogan __le32 *value = s->base + le16_to_cpu( 178932aaf194STahsin Erdogan here->e_value_offs); 1790b9fc761eSTahsin Erdogan 1791b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1792b9fc761eSTahsin Erdogan here->e_name_len, value, 1793b9fc761eSTahsin Erdogan new_size >> 2); 1794daf83281STahsin Erdogan } 1795b9fc761eSTahsin Erdogan here->e_hash = hash; 1796b9fc761eSTahsin Erdogan } 1797b9fc761eSTahsin Erdogan 1798b9fc761eSTahsin Erdogan if (is_block) 1799b9fc761eSTahsin Erdogan ext4_xattr_rehash((struct ext4_xattr_header *)s->base); 1800daf83281STahsin Erdogan 1801dec214d0STahsin Erdogan ret = 0; 1802e50e5129SAndreas Dilger out: 1803dec214d0STahsin Erdogan iput(old_ea_inode); 1804dec214d0STahsin Erdogan iput(new_ea_inode); 1805dec214d0STahsin Erdogan return ret; 1806ac27a0ecSDave Kleikamp } 1807ac27a0ecSDave Kleikamp 1808617ba13bSMingming Cao struct ext4_xattr_block_find { 1809617ba13bSMingming Cao struct ext4_xattr_search s; 1810ac27a0ecSDave Kleikamp struct buffer_head *bh; 1811ac27a0ecSDave Kleikamp }; 1812ac27a0ecSDave Kleikamp 1813ac27a0ecSDave Kleikamp static int 1814617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 1815617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1816ac27a0ecSDave Kleikamp { 1817ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1818ac27a0ecSDave Kleikamp int error; 1819ac27a0ecSDave Kleikamp 1820ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 1821ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 1822ac27a0ecSDave Kleikamp 1823617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 1824ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 1825fb265c9cSTheodore Ts'o bs->bh = ext4_sb_bread(sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 18268418897fSJeffle Xu if (IS_ERR(bs->bh)) { 18278418897fSJeffle Xu error = PTR_ERR(bs->bh); 18288418897fSJeffle Xu bs->bh = NULL; 18298418897fSJeffle Xu return error; 18308418897fSJeffle Xu } 1831ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 1832ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 1833ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 1834de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bs->bh); 1835de05ca85STheodore Ts'o if (error) 1836fb265c9cSTheodore Ts'o return error; 1837ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1838ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 1839ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 1840ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 1841ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 18429496005dSTheodore Ts'o error = xattr_find_entry(inode, &bs->s.here, bs->s.end, 18439496005dSTheodore Ts'o i->name_index, i->name, 1); 1844ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1845fb265c9cSTheodore Ts'o return error; 1846ac27a0ecSDave Kleikamp bs->s.not_found = error; 1847ac27a0ecSDave Kleikamp } 1848fb265c9cSTheodore Ts'o return 0; 1849ac27a0ecSDave Kleikamp } 1850ac27a0ecSDave Kleikamp 1851ac27a0ecSDave Kleikamp static int 1852617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 1853617ba13bSMingming Cao struct ext4_xattr_info *i, 1854617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1855ac27a0ecSDave Kleikamp { 1856ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1857ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 1858b347e2bcSTahsin Erdogan struct ext4_xattr_search s_copy = bs->s; 1859b347e2bcSTahsin Erdogan struct ext4_xattr_search *s = &s_copy; 18607a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 18618a2bfdcbSMingming Cao int error = 0; 186247387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 1863a6d05676STahsin Erdogan struct inode *ea_inode = NULL, *tmp_inode; 1864a6d05676STahsin Erdogan size_t old_ea_inode_quota = 0; 1865a6d05676STahsin Erdogan unsigned int ea_ino; 1866a6d05676STahsin Erdogan 1867ac27a0ecSDave Kleikamp 1868617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 1869ac27a0ecSDave Kleikamp 1870ac27a0ecSDave Kleikamp if (s->base) { 1871fd48e9acSJan Kara int offset = (char *)s->here - bs->bh->b_data; 1872fd48e9acSJan Kara 18735d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 1874188c299eSJan Kara error = ext4_journal_get_write_access(handle, sb, bs->bh, 1875188c299eSJan Kara EXT4_JTR_NONE); 18768a2bfdcbSMingming Cao if (error) 18778a2bfdcbSMingming Cao goto cleanup; 18788a2bfdcbSMingming Cao lock_buffer(bs->bh); 18798a2bfdcbSMingming Cao 1880ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 188182939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 188282939d79SJan Kara 188382939d79SJan Kara /* 188482939d79SJan Kara * This must happen under buffer lock for 188582939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 188682939d79SJan Kara * block 188782939d79SJan Kara */ 188865f8b800SJan Kara if (ea_block_cache) { 188965f8b800SJan Kara struct mb_cache_entry *oe; 189065f8b800SJan Kara 189165f8b800SJan Kara oe = mb_cache_entry_delete_or_get(ea_block_cache, 189265f8b800SJan Kara hash, bs->bh->b_blocknr); 189365f8b800SJan Kara if (oe) { 189465f8b800SJan Kara /* 189565f8b800SJan Kara * Xattr block is getting reused. Leave 189665f8b800SJan Kara * it alone. 189765f8b800SJan Kara */ 189865f8b800SJan Kara mb_cache_entry_put(ea_block_cache, oe); 189965f8b800SJan Kara goto clone_block; 190065f8b800SJan Kara } 190165f8b800SJan Kara } 1902ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 1903daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 1904daf83281STahsin Erdogan true /* is_block */); 1905dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bs->bh); 1906ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 19076a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1908ac27a0ecSDave Kleikamp goto bad_block; 1909ac27a0ecSDave Kleikamp if (!error) 1910dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 19110390131bSFrank Mayhar inode, 1912ac27a0ecSDave Kleikamp bs->bh); 1913ac27a0ecSDave Kleikamp if (error) 1914ac27a0ecSDave Kleikamp goto cleanup; 1915ac27a0ecSDave Kleikamp goto inserted; 1916fd48e9acSJan Kara } 191765f8b800SJan Kara clone_block: 19188a2bfdcbSMingming Cao unlock_buffer(bs->bh); 1919ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 19204efd9f0dSShuqi Zhang s->base = kmemdup(BHDR(bs->bh), bs->bh->b_size, GFP_NOFS); 1921ac27a0ecSDave Kleikamp error = -ENOMEM; 1922ac27a0ecSDave Kleikamp if (s->base == NULL) 1923ac27a0ecSDave Kleikamp goto cleanup; 1924ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1925ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1926ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 1927ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 1928dec214d0STahsin Erdogan 1929dec214d0STahsin Erdogan /* 1930dec214d0STahsin Erdogan * If existing entry points to an xattr inode, we need 1931dec214d0STahsin Erdogan * to prevent ext4_xattr_set_entry() from decrementing 1932dec214d0STahsin Erdogan * ref count on it because the reference belongs to the 1933dec214d0STahsin Erdogan * original block. In this case, make the entry look 1934dec214d0STahsin Erdogan * like it has an empty value. 1935dec214d0STahsin Erdogan */ 1936dec214d0STahsin Erdogan if (!s->not_found && s->here->e_value_inum) { 1937a6d05676STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 1938a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, 1939a6d05676STahsin Erdogan le32_to_cpu(s->here->e_hash), 1940a6d05676STahsin Erdogan &tmp_inode); 1941a6d05676STahsin Erdogan if (error) 1942a6d05676STahsin Erdogan goto cleanup; 1943a6d05676STahsin Erdogan 1944a6d05676STahsin Erdogan if (!ext4_test_inode_state(tmp_inode, 1945a6d05676STahsin Erdogan EXT4_STATE_LUSTRE_EA_INODE)) { 1946dec214d0STahsin Erdogan /* 1947a6d05676STahsin Erdogan * Defer quota free call for previous 1948a6d05676STahsin Erdogan * inode until success is guaranteed. 1949dec214d0STahsin Erdogan */ 1950a6d05676STahsin Erdogan old_ea_inode_quota = le32_to_cpu( 1951dec214d0STahsin Erdogan s->here->e_value_size); 1952a6d05676STahsin Erdogan } 1953a6d05676STahsin Erdogan iput(tmp_inode); 1954a6d05676STahsin Erdogan 1955dec214d0STahsin Erdogan s->here->e_value_inum = 0; 1956dec214d0STahsin Erdogan s->here->e_value_size = 0; 1957dec214d0STahsin Erdogan } 1958ac27a0ecSDave Kleikamp } else { 1959ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 1960216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 1961ac27a0ecSDave Kleikamp error = -ENOMEM; 1962ac27a0ecSDave Kleikamp if (s->base == NULL) 1963ac27a0ecSDave Kleikamp goto cleanup; 1964617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 1965ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 1966ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1967ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1968ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 1969ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 1970ac27a0ecSDave Kleikamp } 1971ac27a0ecSDave Kleikamp 1972daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); 19736a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1974ac27a0ecSDave Kleikamp goto bad_block; 1975ac27a0ecSDave Kleikamp if (error) 1976ac27a0ecSDave Kleikamp goto cleanup; 1977dec214d0STahsin Erdogan 1978dec214d0STahsin Erdogan if (i->value && s->here->e_value_inum) { 1979dec214d0STahsin Erdogan /* 1980dec214d0STahsin Erdogan * A ref count on ea_inode has been taken as part of the call to 1981dec214d0STahsin Erdogan * ext4_xattr_set_entry() above. We would like to drop this 1982dec214d0STahsin Erdogan * extra ref but we have to wait until the xattr block is 1983dec214d0STahsin Erdogan * initialized and has its own ref count on the ea_inode. 1984dec214d0STahsin Erdogan */ 1985dec214d0STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 1986a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, 1987a6d05676STahsin Erdogan le32_to_cpu(s->here->e_hash), 1988a6d05676STahsin Erdogan &ea_inode); 1989dec214d0STahsin Erdogan if (error) { 1990dec214d0STahsin Erdogan ea_inode = NULL; 1991dec214d0STahsin Erdogan goto cleanup; 1992dec214d0STahsin Erdogan } 1993dec214d0STahsin Erdogan } 1994dec214d0STahsin Erdogan 1995ac27a0ecSDave Kleikamp inserted: 1996ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 199747387409STahsin Erdogan new_bh = ext4_xattr_block_cache_find(inode, header(s->base), 199847387409STahsin Erdogan &ce); 1999ac27a0ecSDave Kleikamp if (new_bh) { 2000ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 2001ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 2002ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 2003ac27a0ecSDave Kleikamp else { 20046048c64bSAndreas Gruenbacher u32 ref; 20056048c64bSAndreas Gruenbacher 2006b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 2007b8cb5a54STahsin Erdogan 2008ac27a0ecSDave Kleikamp /* The old block is released after updating 2009ac27a0ecSDave Kleikamp the inode. */ 20101231b3a1SLukas Czerner error = dquot_alloc_block(inode, 20111231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 20125dd4056dSChristoph Hellwig if (error) 2013ac27a0ecSDave Kleikamp goto cleanup; 20145d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 2015188c299eSJan Kara error = ext4_journal_get_write_access( 2016188c299eSJan Kara handle, sb, new_bh, 2017188c299eSJan Kara EXT4_JTR_NONE); 2018ac27a0ecSDave Kleikamp if (error) 2019ac27a0ecSDave Kleikamp goto cleanup_dquot; 2020ac27a0ecSDave Kleikamp lock_buffer(new_bh); 202182939d79SJan Kara /* 202282939d79SJan Kara * We have to be careful about races with 202365f8b800SJan Kara * adding references to xattr block. Once we 202465f8b800SJan Kara * hold buffer lock xattr block's state is 202565f8b800SJan Kara * stable so we can check the additional 202665f8b800SJan Kara * reference fits. 202782939d79SJan Kara */ 202865f8b800SJan Kara ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 202965f8b800SJan Kara if (ref > EXT4_XATTR_REFCOUNT_MAX) { 203082939d79SJan Kara /* 203182939d79SJan Kara * Undo everything and check mbcache 203282939d79SJan Kara * again. 203382939d79SJan Kara */ 203482939d79SJan Kara unlock_buffer(new_bh); 203582939d79SJan Kara dquot_free_block(inode, 203682939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 203782939d79SJan Kara 1)); 203882939d79SJan Kara brelse(new_bh); 203947387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 204082939d79SJan Kara ce = NULL; 204182939d79SJan Kara new_bh = NULL; 204282939d79SJan Kara goto inserted; 204382939d79SJan Kara } 20446048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 204565f8b800SJan Kara if (ref == EXT4_XATTR_REFCOUNT_MAX) 20466048c64bSAndreas Gruenbacher ce->e_reusable = 0; 2047ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 20486048c64bSAndreas Gruenbacher ref); 2049dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2050ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2051dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 20520390131bSFrank Mayhar inode, 2053ac27a0ecSDave Kleikamp new_bh); 2054ac27a0ecSDave Kleikamp if (error) 2055ac27a0ecSDave Kleikamp goto cleanup_dquot; 2056ac27a0ecSDave Kleikamp } 205747387409STahsin Erdogan mb_cache_entry_touch(ea_block_cache, ce); 205847387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2059ac27a0ecSDave Kleikamp ce = NULL; 2060ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 2061ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 2062ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 2063ec000220STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); 2064ac27a0ecSDave Kleikamp new_bh = bs->bh; 2065ac27a0ecSDave Kleikamp get_bh(new_bh); 2066ac27a0ecSDave Kleikamp } else { 2067ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 2068fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 2069fb0a387dSEric Sandeen 2070b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 2071b8cb5a54STahsin Erdogan 2072fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 2073d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 2074fb0a387dSEric Sandeen 2075fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 207612e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 2077fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 2078fb0a387dSEric Sandeen 207955f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 208055f020dbSAllison Henderson NULL, &error); 2081ac27a0ecSDave Kleikamp if (error) 2082ac27a0ecSDave Kleikamp goto cleanup; 2083fb0a387dSEric Sandeen 208412e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 2085fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 2086fb0a387dSEric Sandeen 2087ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 2088ace36ad4SJoe Perches (unsigned long long)block); 2089ac27a0ecSDave Kleikamp 2090ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 2091aebf0243SWang Shilong if (unlikely(!new_bh)) { 2092860d21e2STheodore Ts'o error = -ENOMEM; 2093ac27a0ecSDave Kleikamp getblk_failed: 20947dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 2095e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 2096ac27a0ecSDave Kleikamp goto cleanup; 2097ac27a0ecSDave Kleikamp } 2098dec214d0STahsin Erdogan error = ext4_xattr_inode_inc_ref_all(handle, inode, 2099dec214d0STahsin Erdogan ENTRY(header(s->base)+1)); 2100dec214d0STahsin Erdogan if (error) 2101dec214d0STahsin Erdogan goto getblk_failed; 2102dec214d0STahsin Erdogan if (ea_inode) { 2103dec214d0STahsin Erdogan /* Drop the extra ref on ea_inode. */ 2104dec214d0STahsin Erdogan error = ext4_xattr_inode_dec_ref(handle, 2105dec214d0STahsin Erdogan ea_inode); 2106dec214d0STahsin Erdogan if (error) 2107dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 2108dec214d0STahsin Erdogan "dec ref error=%d", 2109dec214d0STahsin Erdogan error); 2110dec214d0STahsin Erdogan iput(ea_inode); 2111dec214d0STahsin Erdogan ea_inode = NULL; 2112dec214d0STahsin Erdogan } 2113dec214d0STahsin Erdogan 2114ac27a0ecSDave Kleikamp lock_buffer(new_bh); 2115188c299eSJan Kara error = ext4_journal_get_create_access(handle, sb, 2116188c299eSJan Kara new_bh, EXT4_JTR_NONE); 2117ac27a0ecSDave Kleikamp if (error) { 2118ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2119860d21e2STheodore Ts'o error = -EIO; 2120ac27a0ecSDave Kleikamp goto getblk_failed; 2121ac27a0ecSDave Kleikamp } 2122ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 2123dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2124ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 2125ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 212647387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, new_bh); 2127dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, 2128dac7a4b4STheodore Ts'o new_bh); 2129ac27a0ecSDave Kleikamp if (error) 2130ac27a0ecSDave Kleikamp goto cleanup; 2131ac27a0ecSDave Kleikamp } 2132ac27a0ecSDave Kleikamp } 2133ac27a0ecSDave Kleikamp 2134a6d05676STahsin Erdogan if (old_ea_inode_quota) 2135a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, NULL, old_ea_inode_quota); 2136dec214d0STahsin Erdogan 2137ac27a0ecSDave Kleikamp /* Update the inode. */ 2138617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 2139ac27a0ecSDave Kleikamp 2140ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 2141dec214d0STahsin Erdogan if (bs->bh && bs->bh != new_bh) { 2142dec214d0STahsin Erdogan struct ext4_xattr_inode_array *ea_inode_array = NULL; 2143dec214d0STahsin Erdogan 2144dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bs->bh, 2145dec214d0STahsin Erdogan &ea_inode_array, 2146dec214d0STahsin Erdogan 0 /* extra_credits */); 2147dec214d0STahsin Erdogan ext4_xattr_inode_array_free(ea_inode_array); 2148dec214d0STahsin Erdogan } 2149ac27a0ecSDave Kleikamp error = 0; 2150ac27a0ecSDave Kleikamp 2151ac27a0ecSDave Kleikamp cleanup: 2152dec214d0STahsin Erdogan if (ea_inode) { 2153dec214d0STahsin Erdogan int error2; 2154dec214d0STahsin Erdogan 2155dec214d0STahsin Erdogan error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); 2156dec214d0STahsin Erdogan if (error2) 2157dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "dec ref error=%d", 2158dec214d0STahsin Erdogan error2); 2159dec214d0STahsin Erdogan 2160dec214d0STahsin Erdogan /* If there was an error, revert the quota charge. */ 2161dec214d0STahsin Erdogan if (error) 2162a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, ea_inode, 2163dec214d0STahsin Erdogan i_size_read(ea_inode)); 2164dec214d0STahsin Erdogan iput(ea_inode); 2165dec214d0STahsin Erdogan } 2166ac27a0ecSDave Kleikamp if (ce) 216747387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2168ac27a0ecSDave Kleikamp brelse(new_bh); 2169ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 2170ac27a0ecSDave Kleikamp kfree(s->base); 2171ac27a0ecSDave Kleikamp 2172ac27a0ecSDave Kleikamp return error; 2173ac27a0ecSDave Kleikamp 2174ac27a0ecSDave Kleikamp cleanup_dquot: 21751231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 2176ac27a0ecSDave Kleikamp goto cleanup; 2177ac27a0ecSDave Kleikamp 2178ac27a0ecSDave Kleikamp bad_block: 217924676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 218024676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2181ac27a0ecSDave Kleikamp goto cleanup; 2182ac27a0ecSDave Kleikamp 2183ac27a0ecSDave Kleikamp #undef header 2184ac27a0ecSDave Kleikamp } 2185ac27a0ecSDave Kleikamp 2186879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 2187617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2188ac27a0ecSDave Kleikamp { 2189617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2190617ba13bSMingming Cao struct ext4_inode *raw_inode; 2191ac27a0ecSDave Kleikamp int error; 2192ac27a0ecSDave Kleikamp 219367d7d8adSBaokun Li if (!EXT4_INODE_HAS_XATTR_SPACE(inode)) 2194ac27a0ecSDave Kleikamp return 0; 219567d7d8adSBaokun Li 2196617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 2197ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 2198ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 2199ac27a0ecSDave Kleikamp is->s.here = is->s.first; 2200617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 220119f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 22029e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 2203ac27a0ecSDave Kleikamp if (error) 2204ac27a0ecSDave Kleikamp return error; 2205ac27a0ecSDave Kleikamp /* Find the named attribute. */ 22069496005dSTheodore Ts'o error = xattr_find_entry(inode, &is->s.here, is->s.end, 22079496005dSTheodore Ts'o i->name_index, i->name, 0); 2208ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 2209ac27a0ecSDave Kleikamp return error; 2210ac27a0ecSDave Kleikamp is->s.not_found = error; 2211ac27a0ecSDave Kleikamp } 2212ac27a0ecSDave Kleikamp return 0; 2213ac27a0ecSDave Kleikamp } 2214ac27a0ecSDave Kleikamp 2215310c097cSRitesh Harjani int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 2216617ba13bSMingming Cao struct ext4_xattr_info *i, 2217617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2218ac27a0ecSDave Kleikamp { 2219617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2220617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 2221ac27a0ecSDave Kleikamp int error; 2222ac27a0ecSDave Kleikamp 222367d7d8adSBaokun Li if (!EXT4_INODE_HAS_XATTR_SPACE(inode)) 2224ac27a0ecSDave Kleikamp return -ENOSPC; 222567d7d8adSBaokun Li 2226daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 2227ac27a0ecSDave Kleikamp if (error) 2228ac27a0ecSDave Kleikamp return error; 2229617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 2230ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 2231617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 223219f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 2233ac27a0ecSDave Kleikamp } else { 2234ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 223519f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 2236ac27a0ecSDave Kleikamp } 2237ac27a0ecSDave Kleikamp return 0; 2238ac27a0ecSDave Kleikamp } 2239ac27a0ecSDave Kleikamp 22403fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 22413fd16462SJan Kara struct ext4_xattr_info *i) 22423fd16462SJan Kara { 22433fd16462SJan Kara void *value; 22443fd16462SJan Kara 22450bd454c0STahsin Erdogan /* When e_value_inum is set the value is stored externally. */ 22460bd454c0STahsin Erdogan if (s->here->e_value_inum) 22470bd454c0STahsin Erdogan return 0; 22483fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 22493fd16462SJan Kara return 0; 22503fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 22513fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 22523fd16462SJan Kara } 22533fd16462SJan Kara 2254dec214d0STahsin Erdogan static struct buffer_head *ext4_xattr_get_block(struct inode *inode) 2255dec214d0STahsin Erdogan { 2256dec214d0STahsin Erdogan struct buffer_head *bh; 2257dec214d0STahsin Erdogan int error; 2258dec214d0STahsin Erdogan 2259dec214d0STahsin Erdogan if (!EXT4_I(inode)->i_file_acl) 2260dec214d0STahsin Erdogan return NULL; 2261fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2262fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 2263fb265c9cSTheodore Ts'o return bh; 2264dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2265ecaaf408SVasily Averin if (error) { 2266ecaaf408SVasily Averin brelse(bh); 2267dec214d0STahsin Erdogan return ERR_PTR(error); 2268ecaaf408SVasily Averin } 2269dec214d0STahsin Erdogan return bh; 2270dec214d0STahsin Erdogan } 2271dec214d0STahsin Erdogan 2272ac27a0ecSDave Kleikamp /* 2273617ba13bSMingming Cao * ext4_xattr_set_handle() 2274ac27a0ecSDave Kleikamp * 22756e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 2276ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 2277ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 2278ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 2279ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 2280ac27a0ecSDave Kleikamp * previous to the call, respectively. 2281ac27a0ecSDave Kleikamp * 2282ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2283ac27a0ecSDave Kleikamp */ 2284ac27a0ecSDave Kleikamp int 2285617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 2286ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 2287ac27a0ecSDave Kleikamp int flags) 2288ac27a0ecSDave Kleikamp { 2289617ba13bSMingming Cao struct ext4_xattr_info i = { 2290ac27a0ecSDave Kleikamp .name_index = name_index, 2291ac27a0ecSDave Kleikamp .name = name, 2292ac27a0ecSDave Kleikamp .value = value, 2293ac27a0ecSDave Kleikamp .value_len = value_len, 2294e50e5129SAndreas Dilger .in_inode = 0, 2295ac27a0ecSDave Kleikamp }; 2296617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 2297ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2298ac27a0ecSDave Kleikamp }; 2299617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 2300ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2301ac27a0ecSDave Kleikamp }; 2302c755e251STheodore Ts'o int no_expand; 2303ac27a0ecSDave Kleikamp int error; 2304ac27a0ecSDave Kleikamp 2305ac27a0ecSDave Kleikamp if (!name) 2306ac27a0ecSDave Kleikamp return -EINVAL; 2307ac27a0ecSDave Kleikamp if (strlen(name) > 255) 2308ac27a0ecSDave Kleikamp return -ERANGE; 2309b8cb5a54STahsin Erdogan 2310c755e251STheodore Ts'o ext4_write_lock_xattr(inode, &no_expand); 23114d20c685SKalpak Shah 2312c1a5d5f6STahsin Erdogan /* Check journal credits under write lock. */ 2313c1a5d5f6STahsin Erdogan if (ext4_handle_valid(handle)) { 2314dec214d0STahsin Erdogan struct buffer_head *bh; 2315c1a5d5f6STahsin Erdogan int credits; 2316c1a5d5f6STahsin Erdogan 2317dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2318dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2319dec214d0STahsin Erdogan error = PTR_ERR(bh); 2320dec214d0STahsin Erdogan goto cleanup; 2321dec214d0STahsin Erdogan } 2322dec214d0STahsin Erdogan 2323af65207cSTahsin Erdogan credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2324af65207cSTahsin Erdogan value_len, 2325af65207cSTahsin Erdogan flags & XATTR_CREATE); 2326dec214d0STahsin Erdogan brelse(bh); 2327dec214d0STahsin Erdogan 2328a9a8344eSJan Kara if (jbd2_handle_buffer_credits(handle) < credits) { 2329c1a5d5f6STahsin Erdogan error = -ENOSPC; 2330c1a5d5f6STahsin Erdogan goto cleanup; 2331c1a5d5f6STahsin Erdogan } 2332163f0ec1SJan Kara WARN_ON_ONCE(!(current->flags & PF_MEMALLOC_NOFS)); 2333c1a5d5f6STahsin Erdogan } 2334c1a5d5f6STahsin Erdogan 233566543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 233686ebfd08SEric Sandeen if (error) 233786ebfd08SEric Sandeen goto cleanup; 233886ebfd08SEric Sandeen 233919f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 2340617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 2341617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 234219f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 2343ac27a0ecSDave Kleikamp } 2344ac27a0ecSDave Kleikamp 2345617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 2346ac27a0ecSDave Kleikamp if (error) 2347ac27a0ecSDave Kleikamp goto cleanup; 2348ac27a0ecSDave Kleikamp if (is.s.not_found) 2349617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 2350ac27a0ecSDave Kleikamp if (error) 2351ac27a0ecSDave Kleikamp goto cleanup; 2352ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 2353ac27a0ecSDave Kleikamp error = -ENODATA; 2354ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 2355ac27a0ecSDave Kleikamp goto cleanup; 2356ac27a0ecSDave Kleikamp error = 0; 2357ac27a0ecSDave Kleikamp if (!value) 2358ac27a0ecSDave Kleikamp goto cleanup; 2359ac27a0ecSDave Kleikamp } else { 2360ac27a0ecSDave Kleikamp error = -EEXIST; 2361ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 2362ac27a0ecSDave Kleikamp goto cleanup; 2363ac27a0ecSDave Kleikamp } 2364dec214d0STahsin Erdogan 2365ac27a0ecSDave Kleikamp if (!value) { 2366ac27a0ecSDave Kleikamp if (!is.s.not_found) 2367e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2368ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 2369617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2370ac27a0ecSDave Kleikamp } else { 23713fd16462SJan Kara error = 0; 23723fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 23733fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 23743fd16462SJan Kara goto cleanup; 23753fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 23763fd16462SJan Kara goto cleanup; 23773fd16462SJan Kara 2378b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2379b347e2bcSTahsin Erdogan (EXT4_XATTR_SIZE(i.value_len) > 2380b347e2bcSTahsin Erdogan EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) 2381b347e2bcSTahsin Erdogan i.in_inode = 1; 2382b347e2bcSTahsin Erdogan retry_inode: 2383e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2384ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 2385ac27a0ecSDave Kleikamp i.value = NULL; 2386617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2387ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 23887e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 238945ae932dSVasily Averin brelse(bs.bh); 239045ae932dSVasily Averin bs.bh = NULL; 23917e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 23927e01c8e5STiger Yang if (error) 23937e01c8e5STiger Yang goto cleanup; 23947e01c8e5STiger Yang } 2395617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2396b347e2bcSTahsin Erdogan if (!error && !is.s.not_found) { 2397ac27a0ecSDave Kleikamp i.value = NULL; 2398e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, 2399e50e5129SAndreas Dilger &is); 2400b347e2bcSTahsin Erdogan } else if (error == -ENOSPC) { 2401b347e2bcSTahsin Erdogan /* 2402b347e2bcSTahsin Erdogan * Xattr does not fit in the block, store at 2403b347e2bcSTahsin Erdogan * external inode if possible. 2404b347e2bcSTahsin Erdogan */ 2405b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 24066b224899Szhangyi (F) i.value_len && !i.in_inode) { 2407b347e2bcSTahsin Erdogan i.in_inode = 1; 2408b347e2bcSTahsin Erdogan goto retry_inode; 2409b347e2bcSTahsin Erdogan } 2410ac27a0ecSDave Kleikamp } 2411ac27a0ecSDave Kleikamp } 2412ac27a0ecSDave Kleikamp } 2413ac27a0ecSDave Kleikamp if (!error) { 2414617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 2415eeca7ea1SDeepa Dinamani inode->i_ctime = current_time(inode); 2416a642c2c0SJeff Layton inode_inc_iversion(inode); 24176dd4ee7cSKalpak Shah if (!value) 2418c755e251STheodore Ts'o no_expand = 0; 2419617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 2420ac27a0ecSDave Kleikamp /* 2421617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 2422ac27a0ecSDave Kleikamp * error != 0. 2423ac27a0ecSDave Kleikamp */ 2424ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 2425ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 24260390131bSFrank Mayhar ext4_handle_sync(handle); 2427ac27a0ecSDave Kleikamp } 2428e85c81baSXin Yin ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, handle); 2429ac27a0ecSDave Kleikamp 2430ac27a0ecSDave Kleikamp cleanup: 2431ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 2432ac27a0ecSDave Kleikamp brelse(bs.bh); 2433c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 2434ac27a0ecSDave Kleikamp return error; 2435ac27a0ecSDave Kleikamp } 2436ac27a0ecSDave Kleikamp 2437af65207cSTahsin Erdogan int ext4_xattr_set_credits(struct inode *inode, size_t value_len, 2438af65207cSTahsin Erdogan bool is_create, int *credits) 2439c1a5d5f6STahsin Erdogan { 2440dec214d0STahsin Erdogan struct buffer_head *bh; 2441dec214d0STahsin Erdogan int err; 2442c1a5d5f6STahsin Erdogan 2443dec214d0STahsin Erdogan *credits = 0; 2444dec214d0STahsin Erdogan 2445dec214d0STahsin Erdogan if (!EXT4_SB(inode->i_sb)->s_journal) 2446c1a5d5f6STahsin Erdogan return 0; 2447c1a5d5f6STahsin Erdogan 2448dec214d0STahsin Erdogan down_read(&EXT4_I(inode)->xattr_sem); 2449c1a5d5f6STahsin Erdogan 2450dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2451dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2452dec214d0STahsin Erdogan err = PTR_ERR(bh); 2453dec214d0STahsin Erdogan } else { 2454af65207cSTahsin Erdogan *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2455af65207cSTahsin Erdogan value_len, is_create); 2456dec214d0STahsin Erdogan brelse(bh); 2457dec214d0STahsin Erdogan err = 0; 2458c1a5d5f6STahsin Erdogan } 2459dec214d0STahsin Erdogan 2460dec214d0STahsin Erdogan up_read(&EXT4_I(inode)->xattr_sem); 2461dec214d0STahsin Erdogan return err; 2462c1a5d5f6STahsin Erdogan } 2463c1a5d5f6STahsin Erdogan 2464ac27a0ecSDave Kleikamp /* 2465617ba13bSMingming Cao * ext4_xattr_set() 2466ac27a0ecSDave Kleikamp * 2467617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 2468ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 2469ac27a0ecSDave Kleikamp * 2470ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2471ac27a0ecSDave Kleikamp */ 2472ac27a0ecSDave Kleikamp int 2473617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 2474ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 2475ac27a0ecSDave Kleikamp { 2476ac27a0ecSDave Kleikamp handle_t *handle; 2477e50e5129SAndreas Dilger struct super_block *sb = inode->i_sb; 2478ac27a0ecSDave Kleikamp int error, retries = 0; 2479c1a5d5f6STahsin Erdogan int credits; 2480ac27a0ecSDave Kleikamp 2481b8cb5a54STahsin Erdogan error = dquot_initialize(inode); 2482b8cb5a54STahsin Erdogan if (error) 2483b8cb5a54STahsin Erdogan return error; 2484e50e5129SAndreas Dilger 2485ac27a0ecSDave Kleikamp retry: 2486af65207cSTahsin Erdogan error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, 2487af65207cSTahsin Erdogan &credits); 2488dec214d0STahsin Erdogan if (error) 2489dec214d0STahsin Erdogan return error; 2490dec214d0STahsin Erdogan 24919924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 2492ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 2493ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 2494ac27a0ecSDave Kleikamp } else { 2495ac27a0ecSDave Kleikamp int error2; 2496ac27a0ecSDave Kleikamp 2497617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 2498ac27a0ecSDave Kleikamp value, value_len, flags); 2499617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 2500ac27a0ecSDave Kleikamp if (error == -ENOSPC && 2501e50e5129SAndreas Dilger ext4_should_retry_alloc(sb, &retries)) 2502ac27a0ecSDave Kleikamp goto retry; 2503ac27a0ecSDave Kleikamp if (error == 0) 2504ac27a0ecSDave Kleikamp error = error2; 2505ac27a0ecSDave Kleikamp } 2506e85c81baSXin Yin ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, NULL); 2507ac27a0ecSDave Kleikamp 2508ac27a0ecSDave Kleikamp return error; 2509ac27a0ecSDave Kleikamp } 2510ac27a0ecSDave Kleikamp 2511ac27a0ecSDave Kleikamp /* 25126dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 25136dd4ee7cSKalpak Shah * i_extra_isize. 25146dd4ee7cSKalpak Shah */ 25156dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 25166dd4ee7cSKalpak Shah int value_offs_shift, void *to, 251794405713SJan Kara void *from, size_t n) 25186dd4ee7cSKalpak Shah { 25196dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 25206dd4ee7cSKalpak Shah int new_offs; 25216dd4ee7cSKalpak Shah 252294405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 252394405713SJan Kara BUG_ON(value_offs_shift > 0); 252494405713SJan Kara 25256dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 25266dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 2527e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 25286dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 25296dd4ee7cSKalpak Shah value_offs_shift; 25306dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 25316dd4ee7cSKalpak Shah } 25326dd4ee7cSKalpak Shah } 25336dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 25346dd4ee7cSKalpak Shah memmove(to, from, n); 25356dd4ee7cSKalpak Shah } 25366dd4ee7cSKalpak Shah 25376dd4ee7cSKalpak Shah /* 25383f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 25393f2571c1SJan Kara */ 25403f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 25413f2571c1SJan Kara struct ext4_inode *raw_inode, 25423f2571c1SJan Kara struct ext4_xattr_entry *entry) 25433f2571c1SJan Kara { 25443f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 25453f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 25463f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 2547f6109100STahsin Erdogan size_t value_size = le32_to_cpu(entry->e_value_size); 25483f2571c1SJan Kara struct ext4_xattr_info i = { 25493f2571c1SJan Kara .value = NULL, 25503f2571c1SJan Kara .value_len = 0, 25513f2571c1SJan Kara .name_index = entry->e_name_index, 2552f6109100STahsin Erdogan .in_inode = !!entry->e_value_inum, 25533f2571c1SJan Kara }; 25543f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 25553f2571c1SJan Kara int error; 25563f2571c1SJan Kara 25573f2571c1SJan Kara is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 25583f2571c1SJan Kara bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 25593f2571c1SJan Kara buffer = kmalloc(value_size, GFP_NOFS); 25603f2571c1SJan Kara b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 25613f2571c1SJan Kara if (!is || !bs || !buffer || !b_entry_name) { 25623f2571c1SJan Kara error = -ENOMEM; 25633f2571c1SJan Kara goto out; 25643f2571c1SJan Kara } 25653f2571c1SJan Kara 25663f2571c1SJan Kara is->s.not_found = -ENODATA; 25673f2571c1SJan Kara bs->s.not_found = -ENODATA; 25683f2571c1SJan Kara is->iloc.bh = NULL; 25693f2571c1SJan Kara bs->bh = NULL; 25703f2571c1SJan Kara 25713f2571c1SJan Kara /* Save the entry name and the entry value */ 2572f6109100STahsin Erdogan if (entry->e_value_inum) { 2573b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, value_size); 2574f6109100STahsin Erdogan if (error) 2575f6109100STahsin Erdogan goto out; 2576f6109100STahsin Erdogan } else { 2577f6109100STahsin Erdogan size_t value_offs = le16_to_cpu(entry->e_value_offs); 25783f2571c1SJan Kara memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); 2579f6109100STahsin Erdogan } 2580f6109100STahsin Erdogan 25813f2571c1SJan Kara memcpy(b_entry_name, entry->e_name, entry->e_name_len); 25823f2571c1SJan Kara b_entry_name[entry->e_name_len] = '\0'; 25833f2571c1SJan Kara i.name = b_entry_name; 25843f2571c1SJan Kara 25853f2571c1SJan Kara error = ext4_get_inode_loc(inode, &is->iloc); 25863f2571c1SJan Kara if (error) 25873f2571c1SJan Kara goto out; 25883f2571c1SJan Kara 25893f2571c1SJan Kara error = ext4_xattr_ibody_find(inode, &i, is); 25903f2571c1SJan Kara if (error) 25913f2571c1SJan Kara goto out; 25923f2571c1SJan Kara 25933f2571c1SJan Kara /* Remove the chosen entry from the inode */ 2594e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, is); 25953f2571c1SJan Kara if (error) 25963f2571c1SJan Kara goto out; 25973f2571c1SJan Kara 25983f2571c1SJan Kara i.value = buffer; 25993f2571c1SJan Kara i.value_len = value_size; 26003f2571c1SJan Kara error = ext4_xattr_block_find(inode, &i, bs); 26013f2571c1SJan Kara if (error) 26023f2571c1SJan Kara goto out; 26033f2571c1SJan Kara 26043f2571c1SJan Kara /* Add entry which was removed from the inode into the block */ 26053f2571c1SJan Kara error = ext4_xattr_block_set(handle, inode, &i, bs); 26063f2571c1SJan Kara if (error) 26073f2571c1SJan Kara goto out; 26083f2571c1SJan Kara error = 0; 26093f2571c1SJan Kara out: 26103f2571c1SJan Kara kfree(b_entry_name); 26113f2571c1SJan Kara kfree(buffer); 26123f2571c1SJan Kara if (is) 26133f2571c1SJan Kara brelse(is->iloc.bh); 26146bdc9977SVasily Averin if (bs) 26156bdc9977SVasily Averin brelse(bs->bh); 26163f2571c1SJan Kara kfree(is); 26173f2571c1SJan Kara kfree(bs); 26183f2571c1SJan Kara 26193f2571c1SJan Kara return error; 26203f2571c1SJan Kara } 26213f2571c1SJan Kara 2622dfa2064bSJan Kara static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, 2623dfa2064bSJan Kara struct ext4_inode *raw_inode, 2624dfa2064bSJan Kara int isize_diff, size_t ifree, 2625dfa2064bSJan Kara size_t bfree, int *total_ino) 2626dfa2064bSJan Kara { 2627dfa2064bSJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 2628dfa2064bSJan Kara struct ext4_xattr_entry *small_entry; 2629dfa2064bSJan Kara struct ext4_xattr_entry *entry; 2630dfa2064bSJan Kara struct ext4_xattr_entry *last; 2631dfa2064bSJan Kara unsigned int entry_size; /* EA entry size */ 2632dfa2064bSJan Kara unsigned int total_size; /* EA entry size + value size */ 2633dfa2064bSJan Kara unsigned int min_total_size; 2634dfa2064bSJan Kara int error; 2635dfa2064bSJan Kara 2636dfa2064bSJan Kara while (isize_diff > ifree) { 2637dfa2064bSJan Kara entry = NULL; 2638dfa2064bSJan Kara small_entry = NULL; 2639dfa2064bSJan Kara min_total_size = ~0U; 2640dfa2064bSJan Kara last = IFIRST(header); 2641dfa2064bSJan Kara /* Find the entry best suited to be pushed into EA block */ 2642dfa2064bSJan Kara for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 26438cdb5240STheodore Ts'o /* never move system.data out of the inode */ 26448cdb5240STheodore Ts'o if ((last->e_name_len == 4) && 26458cdb5240STheodore Ts'o (last->e_name_index == EXT4_XATTR_INDEX_SYSTEM) && 26468cdb5240STheodore Ts'o !memcmp(last->e_name, "data", 4)) 26478cdb5240STheodore Ts'o continue; 26489bb21cedSTahsin Erdogan total_size = EXT4_XATTR_LEN(last->e_name_len); 26499bb21cedSTahsin Erdogan if (!last->e_value_inum) 26509bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 26519bb21cedSTahsin Erdogan le32_to_cpu(last->e_value_size)); 2652dfa2064bSJan Kara if (total_size <= bfree && 2653dfa2064bSJan Kara total_size < min_total_size) { 2654dfa2064bSJan Kara if (total_size + ifree < isize_diff) { 2655dfa2064bSJan Kara small_entry = last; 2656dfa2064bSJan Kara } else { 2657dfa2064bSJan Kara entry = last; 2658dfa2064bSJan Kara min_total_size = total_size; 2659dfa2064bSJan Kara } 2660dfa2064bSJan Kara } 2661dfa2064bSJan Kara } 2662dfa2064bSJan Kara 2663dfa2064bSJan Kara if (entry == NULL) { 2664dfa2064bSJan Kara if (small_entry == NULL) 2665dfa2064bSJan Kara return -ENOSPC; 2666dfa2064bSJan Kara entry = small_entry; 2667dfa2064bSJan Kara } 2668dfa2064bSJan Kara 2669dfa2064bSJan Kara entry_size = EXT4_XATTR_LEN(entry->e_name_len); 26709bb21cedSTahsin Erdogan total_size = entry_size; 26719bb21cedSTahsin Erdogan if (!entry->e_value_inum) 26729bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 26739bb21cedSTahsin Erdogan le32_to_cpu(entry->e_value_size)); 2674dfa2064bSJan Kara error = ext4_xattr_move_to_block(handle, inode, raw_inode, 2675dfa2064bSJan Kara entry); 2676dfa2064bSJan Kara if (error) 2677dfa2064bSJan Kara return error; 2678dfa2064bSJan Kara 2679dfa2064bSJan Kara *total_ino -= entry_size; 2680dfa2064bSJan Kara ifree += total_size; 2681dfa2064bSJan Kara bfree -= total_size; 2682dfa2064bSJan Kara } 2683dfa2064bSJan Kara 2684dfa2064bSJan Kara return 0; 2685dfa2064bSJan Kara } 2686dfa2064bSJan Kara 26873f2571c1SJan Kara /* 26886dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 26896dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 26906dd4ee7cSKalpak Shah */ 26916dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 26926dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 26936dd4ee7cSKalpak Shah { 26946dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 2695cf0a5e81SMiao Xie struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 2696cf0a5e81SMiao Xie static unsigned int mnt_count; 2697e3014d14SJan Kara size_t min_offs; 2698e3014d14SJan Kara size_t ifree, bfree; 26997b1b2c1bSTheodore Ts'o int total_ino; 27006e0cd088SJan Kara void *base, *end; 2701d0141191SJan Kara int error = 0, tried_min_extra_isize = 0; 2702cf0a5e81SMiao Xie int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); 2703d0141191SJan Kara int isize_diff; /* How much do we need to grow i_extra_isize */ 2704c755e251STheodore Ts'o 27056dd4ee7cSKalpak Shah retry: 2706d0141191SJan Kara isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; 27072e81a4eeSJan Kara if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) 2708b640b2c5SMiao Xie return 0; 27096dd4ee7cSKalpak Shah 27106dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 27116dd4ee7cSKalpak Shah 27126dd4ee7cSKalpak Shah /* 27136dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 27146dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 27156dd4ee7cSKalpak Shah */ 27166dd4ee7cSKalpak Shah 27176e0cd088SJan Kara base = IFIRST(header); 27186dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 27196dd4ee7cSKalpak Shah min_offs = end - base; 2720a805622aSTheodore Ts'o total_ino = sizeof(struct ext4_xattr_ibody_header) + sizeof(u32); 27216dd4ee7cSKalpak Shah 27229e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 27239e92f48cSTheodore Ts'o if (error) 27249e92f48cSTheodore Ts'o goto cleanup; 27259e92f48cSTheodore Ts'o 27266e0cd088SJan Kara ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); 2727e3014d14SJan Kara if (ifree >= isize_diff) 2728e3014d14SJan Kara goto shift; 27296dd4ee7cSKalpak Shah 27306dd4ee7cSKalpak Shah /* 27316dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 27326dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 27336dd4ee7cSKalpak Shah */ 27346dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 273553692ec0SVasily Averin struct buffer_head *bh; 273653692ec0SVasily Averin 2737fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2738fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 2739fb265c9cSTheodore Ts'o error = PTR_ERR(bh); 27406dd4ee7cSKalpak Shah goto cleanup; 2741fb265c9cSTheodore Ts'o } 2742de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 274353692ec0SVasily Averin if (error) { 274453692ec0SVasily Averin brelse(bh); 27456dd4ee7cSKalpak Shah goto cleanup; 274653692ec0SVasily Averin } 27476dd4ee7cSKalpak Shah base = BHDR(bh); 27486dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 27496dd4ee7cSKalpak Shah min_offs = end - base; 27506e0cd088SJan Kara bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, 27516e0cd088SJan Kara NULL); 2752b640b2c5SMiao Xie brelse(bh); 2753e3014d14SJan Kara if (bfree + ifree < isize_diff) { 27546dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 27556dd4ee7cSKalpak Shah tried_min_extra_isize++; 27566dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 27576dd4ee7cSKalpak Shah goto retry; 27586dd4ee7cSKalpak Shah } 2759dfa2064bSJan Kara error = -ENOSPC; 27606dd4ee7cSKalpak Shah goto cleanup; 27616dd4ee7cSKalpak Shah } 27626dd4ee7cSKalpak Shah } else { 2763e3014d14SJan Kara bfree = inode->i_sb->s_blocksize; 27646dd4ee7cSKalpak Shah } 27656dd4ee7cSKalpak Shah 2766dfa2064bSJan Kara error = ext4_xattr_make_inode_space(handle, inode, raw_inode, 2767dfa2064bSJan Kara isize_diff, ifree, bfree, 2768dfa2064bSJan Kara &total_ino); 2769dfa2064bSJan Kara if (error) { 2770dfa2064bSJan Kara if (error == -ENOSPC && !tried_min_extra_isize && 27716dd4ee7cSKalpak Shah s_min_extra_isize) { 27726dd4ee7cSKalpak Shah tried_min_extra_isize++; 27736dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 27746dd4ee7cSKalpak Shah goto retry; 27756dd4ee7cSKalpak Shah } 27766dd4ee7cSKalpak Shah goto cleanup; 27776dd4ee7cSKalpak Shah } 2778e3014d14SJan Kara shift: 2779e3014d14SJan Kara /* Adjust the offsets and shift the remaining entries ahead */ 27806e0cd088SJan Kara ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize 2781e3014d14SJan Kara - new_extra_isize, (void *)raw_inode + 2782e3014d14SJan Kara EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 278394405713SJan Kara (void *)header, total_ino); 2784e3014d14SJan Kara EXT4_I(inode)->i_extra_isize = new_extra_isize; 27856dd4ee7cSKalpak Shah 27866dd4ee7cSKalpak Shah cleanup: 2787b640b2c5SMiao Xie if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) { 2788cf0a5e81SMiao Xie ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", 2789cf0a5e81SMiao Xie inode->i_ino); 2790cf0a5e81SMiao Xie mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); 2791cf0a5e81SMiao Xie } 27926dd4ee7cSKalpak Shah return error; 27936dd4ee7cSKalpak Shah } 27946dd4ee7cSKalpak Shah 2795e50e5129SAndreas Dilger #define EIA_INCR 16 /* must be 2^n */ 2796e50e5129SAndreas Dilger #define EIA_MASK (EIA_INCR - 1) 2797dec214d0STahsin Erdogan 2798dec214d0STahsin Erdogan /* Add the large xattr @inode into @ea_inode_array for deferred iput(). 27990421a189STahsin Erdogan * If @ea_inode_array is new or full it will be grown and the old 2800e50e5129SAndreas Dilger * contents copied over. 2801e50e5129SAndreas Dilger */ 2802e50e5129SAndreas Dilger static int 28030421a189STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 28040421a189STahsin Erdogan struct inode *inode) 2805e50e5129SAndreas Dilger { 28060421a189STahsin Erdogan if (*ea_inode_array == NULL) { 2807e50e5129SAndreas Dilger /* 2808e50e5129SAndreas Dilger * Start with 15 inodes, so it fits into a power-of-two size. 28090421a189STahsin Erdogan * If *ea_inode_array is NULL, this is essentially offsetof() 2810e50e5129SAndreas Dilger */ 28110421a189STahsin Erdogan (*ea_inode_array) = 28120421a189STahsin Erdogan kmalloc(offsetof(struct ext4_xattr_inode_array, 28130421a189STahsin Erdogan inodes[EIA_MASK]), 2814e50e5129SAndreas Dilger GFP_NOFS); 28150421a189STahsin Erdogan if (*ea_inode_array == NULL) 2816e50e5129SAndreas Dilger return -ENOMEM; 28170421a189STahsin Erdogan (*ea_inode_array)->count = 0; 28180421a189STahsin Erdogan } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { 2819e50e5129SAndreas Dilger /* expand the array once all 15 + n * 16 slots are full */ 28200421a189STahsin Erdogan struct ext4_xattr_inode_array *new_array = NULL; 28210421a189STahsin Erdogan int count = (*ea_inode_array)->count; 2822e50e5129SAndreas Dilger 2823e50e5129SAndreas Dilger /* if new_array is NULL, this is essentially offsetof() */ 2824e50e5129SAndreas Dilger new_array = kmalloc( 28250421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, 28260421a189STahsin Erdogan inodes[count + EIA_INCR]), 2827e50e5129SAndreas Dilger GFP_NOFS); 2828e50e5129SAndreas Dilger if (new_array == NULL) 2829e50e5129SAndreas Dilger return -ENOMEM; 28300421a189STahsin Erdogan memcpy(new_array, *ea_inode_array, 28310421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, inodes[count])); 28320421a189STahsin Erdogan kfree(*ea_inode_array); 28330421a189STahsin Erdogan *ea_inode_array = new_array; 2834e50e5129SAndreas Dilger } 28350421a189STahsin Erdogan (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; 2836e50e5129SAndreas Dilger return 0; 2837e50e5129SAndreas Dilger } 2838e50e5129SAndreas Dilger 28396dd4ee7cSKalpak Shah /* 2840617ba13bSMingming Cao * ext4_xattr_delete_inode() 2841ac27a0ecSDave Kleikamp * 2842e50e5129SAndreas Dilger * Free extended attribute resources associated with this inode. Traverse 2843dec214d0STahsin Erdogan * all entries and decrement reference on any xattr inodes associated with this 2844dec214d0STahsin Erdogan * inode. This is called immediately before an inode is freed. We have exclusive 2845dec214d0STahsin Erdogan * access to the inode. If an orphan inode is deleted it will also release its 2846dec214d0STahsin Erdogan * references on xattr block and xattr inodes. 2847ac27a0ecSDave Kleikamp */ 2848dec214d0STahsin Erdogan int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, 284930a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 285030a7eb97STahsin Erdogan int extra_credits) 2851ac27a0ecSDave Kleikamp { 2852ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 2853e50e5129SAndreas Dilger struct ext4_xattr_ibody_header *header; 285430a7eb97STahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 2855dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 2856a6d05676STahsin Erdogan struct inode *ea_inode; 285730a7eb97STahsin Erdogan int error; 285830a7eb97STahsin Erdogan 285983448bdfSJan Kara error = ext4_journal_ensure_credits(handle, extra_credits, 286083448bdfSJan Kara ext4_free_metadata_revoke_credits(inode->i_sb, 1)); 2861a4130367SJan Kara if (error < 0) { 286230a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); 286330a7eb97STahsin Erdogan goto cleanup; 286430a7eb97STahsin Erdogan } 2865ac27a0ecSDave Kleikamp 2866dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2867dec214d0STahsin Erdogan ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 2868e50e5129SAndreas Dilger 2869e50e5129SAndreas Dilger error = ext4_get_inode_loc(inode, &iloc); 2870dec214d0STahsin Erdogan if (error) { 2871dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); 2872e50e5129SAndreas Dilger goto cleanup; 2873e50e5129SAndreas Dilger } 2874dec214d0STahsin Erdogan 2875188c299eSJan Kara error = ext4_journal_get_write_access(handle, inode->i_sb, 2876188c299eSJan Kara iloc.bh, EXT4_JTR_NONE); 2877dec214d0STahsin Erdogan if (error) { 2878dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "write access (error %d)", 2879dec214d0STahsin Erdogan error); 2880dec214d0STahsin Erdogan goto cleanup; 2881dec214d0STahsin Erdogan } 2882dec214d0STahsin Erdogan 2883dec214d0STahsin Erdogan header = IHDR(inode, ext4_raw_inode(&iloc)); 2884dec214d0STahsin Erdogan if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) 2885dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, 2886dec214d0STahsin Erdogan IFIRST(header), 2887dec214d0STahsin Erdogan false /* block_csum */, 2888dec214d0STahsin Erdogan ea_inode_array, 2889dec214d0STahsin Erdogan extra_credits, 2890dec214d0STahsin Erdogan false /* skip_quota */); 2891dec214d0STahsin Erdogan } 2892dec214d0STahsin Erdogan 2893dec214d0STahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 2894fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2895fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 2896fb265c9cSTheodore Ts'o error = PTR_ERR(bh); 2897878520acSTheodore Ts'o if (error == -EIO) { 289854d3adbcSTheodore Ts'o EXT4_ERROR_INODE_ERR(inode, EIO, 289954d3adbcSTheodore Ts'o "block %llu read error", 290024676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2901878520acSTheodore Ts'o } 29027159a986SDan Carpenter bh = NULL; 2903ac27a0ecSDave Kleikamp goto cleanup; 2904ac27a0ecSDave Kleikamp } 2905dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2906de05ca85STheodore Ts'o if (error) 2907ac27a0ecSDave Kleikamp goto cleanup; 2908e50e5129SAndreas Dilger 290930a7eb97STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) { 2910dec214d0STahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 2911a6d05676STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 2912a6d05676STahsin Erdogan if (!entry->e_value_inum) 2913a6d05676STahsin Erdogan continue; 2914a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, 2915a6d05676STahsin Erdogan le32_to_cpu(entry->e_value_inum), 2916a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 2917a6d05676STahsin Erdogan &ea_inode); 2918a6d05676STahsin Erdogan if (error) 2919a6d05676STahsin Erdogan continue; 2920a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, ea_inode, 2921dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 2922a6d05676STahsin Erdogan iput(ea_inode); 2923a6d05676STahsin Erdogan } 2924dec214d0STahsin Erdogan 2925e50e5129SAndreas Dilger } 2926e50e5129SAndreas Dilger 2927dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bh, ea_inode_array, 2928dec214d0STahsin Erdogan extra_credits); 2929dec214d0STahsin Erdogan /* 2930dec214d0STahsin Erdogan * Update i_file_acl value in the same transaction that releases 2931dec214d0STahsin Erdogan * block. 2932dec214d0STahsin Erdogan */ 2933617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 293430a7eb97STahsin Erdogan error = ext4_mark_inode_dirty(handle, inode); 293530a7eb97STahsin Erdogan if (error) { 293630a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", 293730a7eb97STahsin Erdogan error); 293830a7eb97STahsin Erdogan goto cleanup; 293930a7eb97STahsin Erdogan } 2940e85c81baSXin Yin ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, handle); 2941dec214d0STahsin Erdogan } 2942dec214d0STahsin Erdogan error = 0; 2943ac27a0ecSDave Kleikamp cleanup: 294430a7eb97STahsin Erdogan brelse(iloc.bh); 2945ac27a0ecSDave Kleikamp brelse(bh); 2946e50e5129SAndreas Dilger return error; 2947e50e5129SAndreas Dilger } 2948e50e5129SAndreas Dilger 29490421a189STahsin Erdogan void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) 2950e50e5129SAndreas Dilger { 2951dec214d0STahsin Erdogan int idx; 2952e50e5129SAndreas Dilger 29530421a189STahsin Erdogan if (ea_inode_array == NULL) 2954e50e5129SAndreas Dilger return; 2955e50e5129SAndreas Dilger 2956dec214d0STahsin Erdogan for (idx = 0; idx < ea_inode_array->count; ++idx) 2957dec214d0STahsin Erdogan iput(ea_inode_array->inodes[idx]); 29580421a189STahsin Erdogan kfree(ea_inode_array); 2959ac27a0ecSDave Kleikamp } 2960ac27a0ecSDave Kleikamp 2961ac27a0ecSDave Kleikamp /* 296247387409STahsin Erdogan * ext4_xattr_block_cache_insert() 2963ac27a0ecSDave Kleikamp * 296447387409STahsin Erdogan * Create a new entry in the extended attribute block cache, and insert 2965ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 2966ac27a0ecSDave Kleikamp * 2967ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2968ac27a0ecSDave Kleikamp */ 2969ac27a0ecSDave Kleikamp static void 297047387409STahsin Erdogan ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, 297147387409STahsin Erdogan struct buffer_head *bh) 2972ac27a0ecSDave Kleikamp { 29736048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 29746048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 29756048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 29766048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 2977ac27a0ecSDave Kleikamp int error; 2978ac27a0ecSDave Kleikamp 2979cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 2980cdb7ee4cSTahsin Erdogan return; 298147387409STahsin Erdogan error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, 29826048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 2983ac27a0ecSDave Kleikamp if (error) { 298482939d79SJan Kara if (error == -EBUSY) 2985ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 298682939d79SJan Kara } else 2987ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 2988ac27a0ecSDave Kleikamp } 2989ac27a0ecSDave Kleikamp 2990ac27a0ecSDave Kleikamp /* 2991617ba13bSMingming Cao * ext4_xattr_cmp() 2992ac27a0ecSDave Kleikamp * 2993ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 2994ac27a0ecSDave Kleikamp * 2995ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 2996ac27a0ecSDave Kleikamp * a negative error number on errors. 2997ac27a0ecSDave Kleikamp */ 2998ac27a0ecSDave Kleikamp static int 2999617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 3000617ba13bSMingming Cao struct ext4_xattr_header *header2) 3001ac27a0ecSDave Kleikamp { 3002617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 3003ac27a0ecSDave Kleikamp 3004ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 3005ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 3006ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 3007ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 3008ac27a0ecSDave Kleikamp return 1; 3009ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 3010ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 3011ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 3012ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 3013e50e5129SAndreas Dilger entry1->e_value_inum != entry2->e_value_inum || 3014ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 3015ac27a0ecSDave Kleikamp return 1; 30167cec1918STahsin Erdogan if (!entry1->e_value_inum && 30177cec1918STahsin Erdogan memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 3018ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 3019ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 3020ac27a0ecSDave Kleikamp return 1; 3021ac27a0ecSDave Kleikamp 3022617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 3023617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 3024ac27a0ecSDave Kleikamp } 3025ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 3026ac27a0ecSDave Kleikamp return 1; 3027ac27a0ecSDave Kleikamp return 0; 3028ac27a0ecSDave Kleikamp } 3029ac27a0ecSDave Kleikamp 3030ac27a0ecSDave Kleikamp /* 303147387409STahsin Erdogan * ext4_xattr_block_cache_find() 3032ac27a0ecSDave Kleikamp * 3033ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 3034ac27a0ecSDave Kleikamp * 3035ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 3036ac27a0ecSDave Kleikamp * not found or an error occurred. 3037ac27a0ecSDave Kleikamp */ 3038ac27a0ecSDave Kleikamp static struct buffer_head * 303947387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *inode, 304047387409STahsin Erdogan struct ext4_xattr_header *header, 30417a2508e1SJan Kara struct mb_cache_entry **pce) 3042ac27a0ecSDave Kleikamp { 3043ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 30447a2508e1SJan Kara struct mb_cache_entry *ce; 304547387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 3046ac27a0ecSDave Kleikamp 3047cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 3048cdb7ee4cSTahsin Erdogan return NULL; 3049ac27a0ecSDave Kleikamp if (!header->h_hash) 3050ac27a0ecSDave Kleikamp return NULL; /* never share */ 3051ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 305247387409STahsin Erdogan ce = mb_cache_entry_find_first(ea_block_cache, hash); 3053ac27a0ecSDave Kleikamp while (ce) { 3054ac27a0ecSDave Kleikamp struct buffer_head *bh; 3055ac27a0ecSDave Kleikamp 3056fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, ce->e_value, REQ_PRIO); 3057fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 3058fb265c9cSTheodore Ts'o if (PTR_ERR(bh) == -ENOMEM) 3059fb265c9cSTheodore Ts'o return NULL; 30607159a986SDan Carpenter bh = NULL; 306124676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 3062c07dfcb4STahsin Erdogan (unsigned long)ce->e_value); 3063617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 3064ac27a0ecSDave Kleikamp *pce = ce; 3065ac27a0ecSDave Kleikamp return bh; 3066ac27a0ecSDave Kleikamp } 3067ac27a0ecSDave Kleikamp brelse(bh); 306847387409STahsin Erdogan ce = mb_cache_entry_find_next(ea_block_cache, ce); 3069ac27a0ecSDave Kleikamp } 3070ac27a0ecSDave Kleikamp return NULL; 3071ac27a0ecSDave Kleikamp } 3072ac27a0ecSDave Kleikamp 3073ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 3074ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 3075ac27a0ecSDave Kleikamp 3076ac27a0ecSDave Kleikamp /* 3077617ba13bSMingming Cao * ext4_xattr_hash_entry() 3078ac27a0ecSDave Kleikamp * 3079ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 3080ac27a0ecSDave Kleikamp */ 3081b9fc761eSTahsin Erdogan static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, 3082b9fc761eSTahsin Erdogan size_t value_count) 3083ac27a0ecSDave Kleikamp { 3084ac27a0ecSDave Kleikamp __u32 hash = 0; 3085ac27a0ecSDave Kleikamp 3086b9fc761eSTahsin Erdogan while (name_len--) { 3087ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 3088ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 3089ac27a0ecSDave Kleikamp *name++; 3090ac27a0ecSDave Kleikamp } 3091b9fc761eSTahsin Erdogan while (value_count--) { 3092ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 3093ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 3094ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 3095ac27a0ecSDave Kleikamp } 3096b9fc761eSTahsin Erdogan return cpu_to_le32(hash); 3097ac27a0ecSDave Kleikamp } 3098ac27a0ecSDave Kleikamp 3099ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 3100ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 3101ac27a0ecSDave Kleikamp 3102ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 3103ac27a0ecSDave Kleikamp 3104ac27a0ecSDave Kleikamp /* 3105617ba13bSMingming Cao * ext4_xattr_rehash() 3106ac27a0ecSDave Kleikamp * 3107ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 3108ac27a0ecSDave Kleikamp */ 3109daf83281STahsin Erdogan static void ext4_xattr_rehash(struct ext4_xattr_header *header) 3110ac27a0ecSDave Kleikamp { 3111617ba13bSMingming Cao struct ext4_xattr_entry *here; 3112ac27a0ecSDave Kleikamp __u32 hash = 0; 3113ac27a0ecSDave Kleikamp 3114ac27a0ecSDave Kleikamp here = ENTRY(header+1); 3115ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 3116ac27a0ecSDave Kleikamp if (!here->e_hash) { 3117ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 3118ac27a0ecSDave Kleikamp hash = 0; 3119ac27a0ecSDave Kleikamp break; 3120ac27a0ecSDave Kleikamp } 3121ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 3122ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 3123ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 3124617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 3125ac27a0ecSDave Kleikamp } 3126ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 3127ac27a0ecSDave Kleikamp } 3128ac27a0ecSDave Kleikamp 3129ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 3130ac27a0ecSDave Kleikamp 31319c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 31329c191f70ST Makphaibulchoke 31337a2508e1SJan Kara struct mb_cache * 313482939d79SJan Kara ext4_xattr_create_cache(void) 3135ac27a0ecSDave Kleikamp { 31367a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 3137ac27a0ecSDave Kleikamp } 3138ac27a0ecSDave Kleikamp 31397a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 3140ac27a0ecSDave Kleikamp { 31419c191f70ST Makphaibulchoke if (cache) 31427a2508e1SJan Kara mb_cache_destroy(cache); 3143ac27a0ecSDave Kleikamp } 31449c191f70ST Makphaibulchoke 3145