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); 84*f3bbac32SLinus Torvalds static __le32 ext4_xattr_hash_entry_signed(char *name, size_t name_len, __le32 *value, 85*f3bbac32SLinus Torvalds size_t value_count); 86daf83281STahsin Erdogan static void ext4_xattr_rehash(struct ext4_xattr_header *); 87ac27a0ecSDave Kleikamp 88d6006186SEric Biggers static const struct xattr_handler * const ext4_xattr_handler_map[] = { 89617ba13bSMingming Cao [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, 9003010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 9164e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, 9264e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, 93ac27a0ecSDave Kleikamp #endif 94617ba13bSMingming Cao [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, 9503010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 96617ba13bSMingming Cao [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, 97ac27a0ecSDave Kleikamp #endif 9888ee9d57SJan (janneke) Nieuwenhuizen [EXT4_XATTR_INDEX_HURD] = &ext4_xattr_hurd_handler, 99ac27a0ecSDave Kleikamp }; 100ac27a0ecSDave Kleikamp 10111e27528SStephen Hemminger const struct xattr_handler *ext4_xattr_handlers[] = { 102617ba13bSMingming Cao &ext4_xattr_user_handler, 103617ba13bSMingming Cao &ext4_xattr_trusted_handler, 10403010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 10564e178a7SChristoph Hellwig &posix_acl_access_xattr_handler, 10664e178a7SChristoph Hellwig &posix_acl_default_xattr_handler, 107ac27a0ecSDave Kleikamp #endif 10803010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 109617ba13bSMingming Cao &ext4_xattr_security_handler, 110ac27a0ecSDave Kleikamp #endif 11188ee9d57SJan (janneke) Nieuwenhuizen &ext4_xattr_hurd_handler, 112ac27a0ecSDave Kleikamp NULL 113ac27a0ecSDave Kleikamp }; 114ac27a0ecSDave Kleikamp 11547387409STahsin Erdogan #define EA_BLOCK_CACHE(inode) (((struct ext4_sb_info *) \ 11647387409STahsin Erdogan inode->i_sb->s_fs_info)->s_ea_block_cache) 1179c191f70ST Makphaibulchoke 118dec214d0STahsin Erdogan #define EA_INODE_CACHE(inode) (((struct ext4_sb_info *) \ 119dec214d0STahsin Erdogan inode->i_sb->s_fs_info)->s_ea_inode_cache) 120dec214d0STahsin Erdogan 12130a7eb97STahsin Erdogan static int 12230a7eb97STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 12330a7eb97STahsin Erdogan struct inode *inode); 12430a7eb97STahsin Erdogan 12533d201e0STahsin Erdogan #ifdef CONFIG_LOCKDEP 12633d201e0STahsin Erdogan void ext4_xattr_inode_set_class(struct inode *ea_inode) 12733d201e0STahsin Erdogan { 12833d201e0STahsin Erdogan lockdep_set_subclass(&ea_inode->i_rwsem, 1); 12933d201e0STahsin Erdogan } 13033d201e0STahsin Erdogan #endif 13133d201e0STahsin Erdogan 132cc8e94fdSDarrick J. Wong static __le32 ext4_xattr_block_csum(struct inode *inode, 133cc8e94fdSDarrick J. Wong sector_t block_nr, 134cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 135cc8e94fdSDarrick J. Wong { 136cc8e94fdSDarrick J. Wong struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 137d6a77105STheodore Ts'o __u32 csum; 138d6a77105STheodore Ts'o __le64 dsk_block_nr = cpu_to_le64(block_nr); 139b47820edSDaeho Jeong __u32 dummy_csum = 0; 140b47820edSDaeho Jeong int offset = offsetof(struct ext4_xattr_header, h_checksum); 141cc8e94fdSDarrick J. Wong 142d6a77105STheodore Ts'o csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, 143d6a77105STheodore Ts'o sizeof(dsk_block_nr)); 144b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); 145b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); 146b47820edSDaeho Jeong offset += sizeof(dummy_csum); 147b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, 148b47820edSDaeho Jeong EXT4_BLOCK_SIZE(inode->i_sb) - offset); 14941eb70ddSTao Ma 150cc8e94fdSDarrick J. Wong return cpu_to_le32(csum); 151cc8e94fdSDarrick J. Wong } 152cc8e94fdSDarrick J. Wong 153cc8e94fdSDarrick J. Wong static int ext4_xattr_block_csum_verify(struct inode *inode, 154dac7a4b4STheodore Ts'o struct buffer_head *bh) 155cc8e94fdSDarrick J. Wong { 156dac7a4b4STheodore Ts'o struct ext4_xattr_header *hdr = BHDR(bh); 157dac7a4b4STheodore Ts'o int ret = 1; 158dac7a4b4STheodore Ts'o 159dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) { 160dac7a4b4STheodore Ts'o lock_buffer(bh); 161dac7a4b4STheodore Ts'o ret = (hdr->h_checksum == ext4_xattr_block_csum(inode, 162dac7a4b4STheodore Ts'o bh->b_blocknr, hdr)); 163dac7a4b4STheodore Ts'o unlock_buffer(bh); 164dac7a4b4STheodore Ts'o } 165dac7a4b4STheodore Ts'o return ret; 166cc8e94fdSDarrick J. Wong } 167cc8e94fdSDarrick J. Wong 168cc8e94fdSDarrick J. Wong static void ext4_xattr_block_csum_set(struct inode *inode, 169cc8e94fdSDarrick J. Wong struct buffer_head *bh) 170cc8e94fdSDarrick J. Wong { 171dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) 172dac7a4b4STheodore Ts'o BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode, 173dac7a4b4STheodore Ts'o bh->b_blocknr, BHDR(bh)); 174cc8e94fdSDarrick J. Wong } 175cc8e94fdSDarrick J. Wong 17611e27528SStephen Hemminger static inline const struct xattr_handler * 177617ba13bSMingming Cao ext4_xattr_handler(int name_index) 178ac27a0ecSDave Kleikamp { 17911e27528SStephen Hemminger const struct xattr_handler *handler = NULL; 180ac27a0ecSDave Kleikamp 181617ba13bSMingming Cao if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) 182617ba13bSMingming Cao handler = ext4_xattr_handler_map[name_index]; 183ac27a0ecSDave Kleikamp return handler; 184ac27a0ecSDave Kleikamp } 185ac27a0ecSDave Kleikamp 186ac27a0ecSDave Kleikamp static int 1872c4f9923SEric Biggers ext4_xattr_check_entries(struct ext4_xattr_entry *entry, void *end, 188a0626e75SDarrick J. Wong void *value_start) 189ac27a0ecSDave Kleikamp { 190a0626e75SDarrick J. Wong struct ext4_xattr_entry *e = entry; 191a0626e75SDarrick J. Wong 192d7614cc1SEric Biggers /* Find the end of the names list */ 193a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(e)) { 194a0626e75SDarrick J. Wong struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); 195ac27a0ecSDave Kleikamp if ((void *)next >= end) 1966a797d27SDarrick J. Wong return -EFSCORRUPTED; 1977d95178cSTheodore Ts'o if (strnlen(e->e_name, e->e_name_len) != e->e_name_len) 1987d95178cSTheodore Ts'o return -EFSCORRUPTED; 199a0626e75SDarrick J. Wong e = next; 200ac27a0ecSDave Kleikamp } 201a0626e75SDarrick J. Wong 202d7614cc1SEric Biggers /* Check the values */ 203a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(entry)) { 204d7614cc1SEric Biggers u32 size = le32_to_cpu(entry->e_value_size); 205ce3fd194SEric Biggers 20654dd0e0aSTheodore Ts'o if (size > EXT4_XATTR_SIZE_MAX) 207ce3fd194SEric Biggers return -EFSCORRUPTED; 208ce3fd194SEric Biggers 209ce3fd194SEric Biggers if (size != 0 && entry->e_value_inum == 0) { 210ce3fd194SEric Biggers u16 offs = le16_to_cpu(entry->e_value_offs); 211d7614cc1SEric Biggers void *value; 212d7614cc1SEric Biggers 213d7614cc1SEric Biggers /* 214d7614cc1SEric Biggers * The value cannot overlap the names, and the value 215d7614cc1SEric Biggers * with padding cannot extend beyond 'end'. Check both 216d7614cc1SEric Biggers * the padded and unpadded sizes, since the size may 217d7614cc1SEric Biggers * overflow to 0 when adding padding. 218d7614cc1SEric Biggers */ 219d7614cc1SEric Biggers if (offs > end - value_start) 2206a797d27SDarrick J. Wong return -EFSCORRUPTED; 221d7614cc1SEric Biggers value = value_start + offs; 222d7614cc1SEric Biggers if (value < (void *)e + sizeof(u32) || 223d7614cc1SEric Biggers size > end - value || 224d7614cc1SEric Biggers EXT4_XATTR_SIZE(size) > end - value) 225d7614cc1SEric Biggers return -EFSCORRUPTED; 226d7614cc1SEric Biggers } 227a0626e75SDarrick J. Wong entry = EXT4_XATTR_NEXT(entry); 228a0626e75SDarrick J. Wong } 229a0626e75SDarrick J. Wong 230ac27a0ecSDave Kleikamp return 0; 231ac27a0ecSDave Kleikamp } 232ac27a0ecSDave Kleikamp 233ac27a0ecSDave Kleikamp static inline int 234de05ca85STheodore Ts'o __ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh, 235de05ca85STheodore Ts'o const char *function, unsigned int line) 236ac27a0ecSDave Kleikamp { 237de05ca85STheodore Ts'o int error = -EFSCORRUPTED; 238cc8e94fdSDarrick J. Wong 239617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 240ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) 241de05ca85STheodore Ts'o goto errout; 242513f86d7STheodore Ts'o if (buffer_verified(bh)) 243513f86d7STheodore Ts'o return 0; 244513f86d7STheodore Ts'o 245de05ca85STheodore Ts'o error = -EFSBADCRC; 246dac7a4b4STheodore Ts'o if (!ext4_xattr_block_csum_verify(inode, bh)) 247de05ca85STheodore Ts'o goto errout; 2482c4f9923SEric Biggers error = ext4_xattr_check_entries(BFIRST(bh), bh->b_data + bh->b_size, 249a0626e75SDarrick J. Wong bh->b_data); 250de05ca85STheodore Ts'o errout: 251de05ca85STheodore Ts'o if (error) 25254d3adbcSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, -error, 253de05ca85STheodore Ts'o "corrupted xattr block %llu", 254de05ca85STheodore Ts'o (unsigned long long) bh->b_blocknr); 255de05ca85STheodore Ts'o else 256cc8e94fdSDarrick J. Wong set_buffer_verified(bh); 257cc8e94fdSDarrick J. Wong return error; 258ac27a0ecSDave Kleikamp } 259ac27a0ecSDave Kleikamp 260de05ca85STheodore Ts'o #define ext4_xattr_check_block(inode, bh) \ 261de05ca85STheodore Ts'o __ext4_xattr_check_block((inode), (bh), __func__, __LINE__) 262de05ca85STheodore Ts'o 263de05ca85STheodore Ts'o 2649e92f48cSTheodore Ts'o static int 2659e92f48cSTheodore Ts'o __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, 2669e92f48cSTheodore Ts'o void *end, const char *function, unsigned int line) 2679e92f48cSTheodore Ts'o { 2689e92f48cSTheodore Ts'o int error = -EFSCORRUPTED; 2699e92f48cSTheodore Ts'o 270290ab230SEric Biggers if (end - (void *)header < sizeof(*header) + sizeof(u32) || 27119962509SEric Biggers (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) 2729e92f48cSTheodore Ts'o goto errout; 2732c4f9923SEric Biggers error = ext4_xattr_check_entries(IFIRST(header), end, IFIRST(header)); 2749e92f48cSTheodore Ts'o errout: 2759e92f48cSTheodore Ts'o if (error) 27654d3adbcSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, -error, 2779e92f48cSTheodore Ts'o "corrupted in-inode xattr"); 2789e92f48cSTheodore Ts'o return error; 2799e92f48cSTheodore Ts'o } 2809e92f48cSTheodore Ts'o 2819e92f48cSTheodore Ts'o #define xattr_check_inode(inode, header, end) \ 2829e92f48cSTheodore Ts'o __xattr_check_inode((inode), (header), (end), __func__, __LINE__) 2839e92f48cSTheodore Ts'o 284ac27a0ecSDave Kleikamp static int 2859496005dSTheodore Ts'o xattr_find_entry(struct inode *inode, struct ext4_xattr_entry **pentry, 2869496005dSTheodore Ts'o void *end, int name_index, const char *name, int sorted) 287ac27a0ecSDave Kleikamp { 2889496005dSTheodore Ts'o struct ext4_xattr_entry *entry, *next; 289ac27a0ecSDave Kleikamp size_t name_len; 290ac27a0ecSDave Kleikamp int cmp = 1; 291ac27a0ecSDave Kleikamp 292ac27a0ecSDave Kleikamp if (name == NULL) 293ac27a0ecSDave Kleikamp return -EINVAL; 294ac27a0ecSDave Kleikamp name_len = strlen(name); 2959496005dSTheodore Ts'o for (entry = *pentry; !IS_LAST_ENTRY(entry); entry = next) { 2969496005dSTheodore Ts'o next = EXT4_XATTR_NEXT(entry); 2979496005dSTheodore Ts'o if ((void *) next >= end) { 2989496005dSTheodore Ts'o EXT4_ERROR_INODE(inode, "corrupted xattr entries"); 2999496005dSTheodore Ts'o return -EFSCORRUPTED; 3009496005dSTheodore Ts'o } 301ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 302ac27a0ecSDave Kleikamp if (!cmp) 303ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 304ac27a0ecSDave Kleikamp if (!cmp) 305ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 306ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 307ac27a0ecSDave Kleikamp break; 308ac27a0ecSDave Kleikamp } 309ac27a0ecSDave Kleikamp *pentry = entry; 310ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 311ac27a0ecSDave Kleikamp } 312ac27a0ecSDave Kleikamp 313dec214d0STahsin Erdogan static u32 314dec214d0STahsin Erdogan ext4_xattr_inode_hash(struct ext4_sb_info *sbi, const void *buffer, size_t size) 315dec214d0STahsin Erdogan { 316dec214d0STahsin Erdogan return ext4_chksum(sbi, sbi->s_csum_seed, buffer, size); 317dec214d0STahsin Erdogan } 318dec214d0STahsin Erdogan 319dec214d0STahsin Erdogan static u64 ext4_xattr_inode_get_ref(struct inode *ea_inode) 320dec214d0STahsin Erdogan { 321dec214d0STahsin Erdogan return ((u64)ea_inode->i_ctime.tv_sec << 32) | 322ee73f9a5SJeff Layton (u32) inode_peek_iversion_raw(ea_inode); 323dec214d0STahsin Erdogan } 324dec214d0STahsin Erdogan 325dec214d0STahsin Erdogan static void ext4_xattr_inode_set_ref(struct inode *ea_inode, u64 ref_count) 326dec214d0STahsin Erdogan { 327dec214d0STahsin Erdogan ea_inode->i_ctime.tv_sec = (u32)(ref_count >> 32); 328ee73f9a5SJeff Layton inode_set_iversion_raw(ea_inode, ref_count & 0xffffffff); 329dec214d0STahsin Erdogan } 330dec214d0STahsin Erdogan 331dec214d0STahsin Erdogan static u32 ext4_xattr_inode_get_hash(struct inode *ea_inode) 332dec214d0STahsin Erdogan { 333dec214d0STahsin Erdogan return (u32)ea_inode->i_atime.tv_sec; 334dec214d0STahsin Erdogan } 335dec214d0STahsin Erdogan 336dec214d0STahsin Erdogan static void ext4_xattr_inode_set_hash(struct inode *ea_inode, u32 hash) 337dec214d0STahsin Erdogan { 338dec214d0STahsin Erdogan ea_inode->i_atime.tv_sec = hash; 339dec214d0STahsin Erdogan } 340dec214d0STahsin Erdogan 341e50e5129SAndreas Dilger /* 342e50e5129SAndreas Dilger * Read the EA value from an inode. 343e50e5129SAndreas Dilger */ 34490966693STahsin Erdogan static int ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t size) 345e50e5129SAndreas Dilger { 3469699d4f9STahsin Erdogan int blocksize = 1 << ea_inode->i_blkbits; 3479699d4f9STahsin Erdogan int bh_count = (size + blocksize - 1) >> ea_inode->i_blkbits; 3489699d4f9STahsin Erdogan int tail_size = (size % blocksize) ?: blocksize; 3499699d4f9STahsin Erdogan struct buffer_head *bhs_inline[8]; 3509699d4f9STahsin Erdogan struct buffer_head **bhs = bhs_inline; 3519699d4f9STahsin Erdogan int i, ret; 352e50e5129SAndreas Dilger 3539699d4f9STahsin Erdogan if (bh_count > ARRAY_SIZE(bhs_inline)) { 3549699d4f9STahsin Erdogan bhs = kmalloc_array(bh_count, sizeof(*bhs), GFP_NOFS); 3559699d4f9STahsin Erdogan if (!bhs) 3569699d4f9STahsin Erdogan return -ENOMEM; 357e50e5129SAndreas Dilger } 3589699d4f9STahsin Erdogan 3599699d4f9STahsin Erdogan ret = ext4_bread_batch(ea_inode, 0 /* block */, bh_count, 3609699d4f9STahsin Erdogan true /* wait */, bhs); 3619699d4f9STahsin Erdogan if (ret) 3629699d4f9STahsin Erdogan goto free_bhs; 3639699d4f9STahsin Erdogan 3649699d4f9STahsin Erdogan for (i = 0; i < bh_count; i++) { 3659699d4f9STahsin Erdogan /* There shouldn't be any holes in ea_inode. */ 3669699d4f9STahsin Erdogan if (!bhs[i]) { 3679699d4f9STahsin Erdogan ret = -EFSCORRUPTED; 3689699d4f9STahsin Erdogan goto put_bhs; 3699699d4f9STahsin Erdogan } 3709699d4f9STahsin Erdogan memcpy((char *)buf + blocksize * i, bhs[i]->b_data, 3719699d4f9STahsin Erdogan i < bh_count - 1 ? blocksize : tail_size); 3729699d4f9STahsin Erdogan } 3739699d4f9STahsin Erdogan ret = 0; 3749699d4f9STahsin Erdogan put_bhs: 3759699d4f9STahsin Erdogan for (i = 0; i < bh_count; i++) 3769699d4f9STahsin Erdogan brelse(bhs[i]); 3779699d4f9STahsin Erdogan free_bhs: 3789699d4f9STahsin Erdogan if (bhs != bhs_inline) 3799699d4f9STahsin Erdogan kfree(bhs); 3809699d4f9STahsin Erdogan return ret; 381e50e5129SAndreas Dilger } 382e50e5129SAndreas Dilger 383a6d05676STahsin Erdogan #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec) 384a6d05676STahsin Erdogan 385bab79b04STahsin Erdogan static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, 386a6d05676STahsin Erdogan u32 ea_inode_hash, struct inode **ea_inode) 387e50e5129SAndreas Dilger { 388bab79b04STahsin Erdogan struct inode *inode; 389bab79b04STahsin Erdogan int err; 390e50e5129SAndreas Dilger 3918a363970STheodore Ts'o inode = ext4_iget(parent->i_sb, ea_ino, EXT4_IGET_NORMAL); 392bab79b04STahsin Erdogan if (IS_ERR(inode)) { 393bab79b04STahsin Erdogan err = PTR_ERR(inode); 394dec214d0STahsin Erdogan ext4_error(parent->i_sb, 395dec214d0STahsin Erdogan "error while reading EA inode %lu err=%d", ea_ino, 396dec214d0STahsin Erdogan err); 397bab79b04STahsin Erdogan return err; 398e50e5129SAndreas Dilger } 399e50e5129SAndreas Dilger 400bab79b04STahsin Erdogan if (is_bad_inode(inode)) { 401dec214d0STahsin Erdogan ext4_error(parent->i_sb, 402dec214d0STahsin Erdogan "error while reading EA inode %lu is_bad_inode", 403dec214d0STahsin Erdogan ea_ino); 404bab79b04STahsin Erdogan err = -EIO; 405e50e5129SAndreas Dilger goto error; 406e50e5129SAndreas Dilger } 407e50e5129SAndreas Dilger 408bab79b04STahsin Erdogan if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) { 409dec214d0STahsin Erdogan ext4_error(parent->i_sb, 410dec214d0STahsin Erdogan "EA inode %lu does not have EXT4_EA_INODE_FL flag", 411dec214d0STahsin Erdogan ea_ino); 412bab79b04STahsin Erdogan err = -EINVAL; 413e50e5129SAndreas Dilger goto error; 414e50e5129SAndreas Dilger } 415e50e5129SAndreas Dilger 416a6d05676STahsin Erdogan ext4_xattr_inode_set_class(inode); 417a6d05676STahsin Erdogan 418a6d05676STahsin Erdogan /* 419a6d05676STahsin Erdogan * Check whether this is an old Lustre-style xattr inode. Lustre 420a6d05676STahsin Erdogan * implementation does not have hash validation, rather it has a 421a6d05676STahsin Erdogan * backpointer from ea_inode to the parent inode. 422a6d05676STahsin Erdogan */ 423a6d05676STahsin Erdogan if (ea_inode_hash != ext4_xattr_inode_get_hash(inode) && 424a6d05676STahsin Erdogan EXT4_XATTR_INODE_GET_PARENT(inode) == parent->i_ino && 425a6d05676STahsin Erdogan inode->i_generation == parent->i_generation) { 426a6d05676STahsin Erdogan ext4_set_inode_state(inode, EXT4_STATE_LUSTRE_EA_INODE); 427a6d05676STahsin Erdogan ext4_xattr_inode_set_ref(inode, 1); 428a6d05676STahsin Erdogan } else { 429a6d05676STahsin Erdogan inode_lock(inode); 430a6d05676STahsin Erdogan inode->i_flags |= S_NOQUOTA; 431a6d05676STahsin Erdogan inode_unlock(inode); 432a6d05676STahsin Erdogan } 433a6d05676STahsin Erdogan 434bab79b04STahsin Erdogan *ea_inode = inode; 435bab79b04STahsin Erdogan return 0; 436e50e5129SAndreas Dilger error: 437bab79b04STahsin Erdogan iput(inode); 438bab79b04STahsin Erdogan return err; 439e50e5129SAndreas Dilger } 440e50e5129SAndreas Dilger 4416bc0d63dSJan Kara /* Remove entry from mbcache when EA inode is getting evicted */ 4426bc0d63dSJan Kara void ext4_evict_ea_inode(struct inode *inode) 4436bc0d63dSJan Kara { 44465f8b800SJan Kara struct mb_cache_entry *oe; 44565f8b800SJan Kara 44665f8b800SJan Kara if (!EA_INODE_CACHE(inode)) 44765f8b800SJan Kara return; 44865f8b800SJan Kara /* Wait for entry to get unused so that we can remove it */ 44965f8b800SJan Kara while ((oe = mb_cache_entry_delete_or_get(EA_INODE_CACHE(inode), 45065f8b800SJan Kara ext4_xattr_inode_get_hash(inode), inode->i_ino))) { 45165f8b800SJan Kara mb_cache_entry_wait_unused(oe); 45265f8b800SJan Kara mb_cache_entry_put(EA_INODE_CACHE(inode), oe); 45365f8b800SJan Kara } 4546bc0d63dSJan Kara } 4556bc0d63dSJan Kara 456dec214d0STahsin Erdogan static int 457b9fc761eSTahsin Erdogan ext4_xattr_inode_verify_hashes(struct inode *ea_inode, 458b9fc761eSTahsin Erdogan struct ext4_xattr_entry *entry, void *buffer, 459b9fc761eSTahsin Erdogan size_t size) 460dec214d0STahsin Erdogan { 461dec214d0STahsin Erdogan u32 hash; 462dec214d0STahsin Erdogan 463dec214d0STahsin Erdogan /* Verify stored hash matches calculated hash. */ 464dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); 465dec214d0STahsin Erdogan if (hash != ext4_xattr_inode_get_hash(ea_inode)) 466dec214d0STahsin Erdogan return -EFSCORRUPTED; 467b9fc761eSTahsin Erdogan 468b9fc761eSTahsin Erdogan if (entry) { 469b9fc761eSTahsin Erdogan __le32 e_hash, tmp_data; 470b9fc761eSTahsin Erdogan 471b9fc761eSTahsin Erdogan /* Verify entry hash. */ 472b9fc761eSTahsin Erdogan tmp_data = cpu_to_le32(hash); 473b9fc761eSTahsin Erdogan e_hash = ext4_xattr_hash_entry(entry->e_name, entry->e_name_len, 474b9fc761eSTahsin Erdogan &tmp_data, 1); 475*f3bbac32SLinus Torvalds /* All good? */ 476*f3bbac32SLinus Torvalds if (e_hash == entry->e_hash) 477*f3bbac32SLinus Torvalds return 0; 478*f3bbac32SLinus Torvalds 479*f3bbac32SLinus Torvalds /* 480*f3bbac32SLinus Torvalds * Not good. Maybe the entry hash was calculated 481*f3bbac32SLinus Torvalds * using the buggy signed char version? 482*f3bbac32SLinus Torvalds */ 483*f3bbac32SLinus Torvalds e_hash = ext4_xattr_hash_entry_signed(entry->e_name, entry->e_name_len, 484*f3bbac32SLinus Torvalds &tmp_data, 1); 485*f3bbac32SLinus Torvalds if (e_hash == entry->e_hash) 486*f3bbac32SLinus Torvalds return 0; 487*f3bbac32SLinus Torvalds 488*f3bbac32SLinus Torvalds /* Still no match - bad */ 489b9fc761eSTahsin Erdogan return -EFSCORRUPTED; 490b9fc761eSTahsin Erdogan } 491dec214d0STahsin Erdogan return 0; 492dec214d0STahsin Erdogan } 493dec214d0STahsin Erdogan 494e50e5129SAndreas Dilger /* 495b9fc761eSTahsin Erdogan * Read xattr value from the EA inode. 496e50e5129SAndreas Dilger */ 497e50e5129SAndreas Dilger static int 498b9fc761eSTahsin Erdogan ext4_xattr_inode_get(struct inode *inode, struct ext4_xattr_entry *entry, 499b9fc761eSTahsin Erdogan void *buffer, size_t size) 500e50e5129SAndreas Dilger { 501dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 502bab79b04STahsin Erdogan struct inode *ea_inode; 503dec214d0STahsin Erdogan int err; 504e50e5129SAndreas Dilger 505b9fc761eSTahsin Erdogan err = ext4_xattr_inode_iget(inode, le32_to_cpu(entry->e_value_inum), 506a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), &ea_inode); 507dec214d0STahsin Erdogan if (err) { 508dec214d0STahsin Erdogan ea_inode = NULL; 509dec214d0STahsin Erdogan goto out; 510dec214d0STahsin Erdogan } 511e50e5129SAndreas Dilger 512dec214d0STahsin Erdogan if (i_size_read(ea_inode) != size) { 513dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 514dec214d0STahsin Erdogan "ea_inode file size=%llu entry size=%zu", 515dec214d0STahsin Erdogan i_size_read(ea_inode), size); 516dec214d0STahsin Erdogan err = -EFSCORRUPTED; 517dec214d0STahsin Erdogan goto out; 518dec214d0STahsin Erdogan } 519dec214d0STahsin Erdogan 520dec214d0STahsin Erdogan err = ext4_xattr_inode_read(ea_inode, buffer, size); 521dec214d0STahsin Erdogan if (err) 522dec214d0STahsin Erdogan goto out; 523dec214d0STahsin Erdogan 524a6d05676STahsin Erdogan if (!ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) { 525a6d05676STahsin Erdogan err = ext4_xattr_inode_verify_hashes(ea_inode, entry, buffer, 526a6d05676STahsin Erdogan size); 527a6d05676STahsin Erdogan if (err) { 528dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 529dec214d0STahsin Erdogan "EA inode hash validation failed"); 530dec214d0STahsin Erdogan goto out; 531dec214d0STahsin Erdogan } 532dec214d0STahsin Erdogan 533dec214d0STahsin Erdogan if (ea_inode_cache) 534dec214d0STahsin Erdogan mb_cache_entry_create(ea_inode_cache, GFP_NOFS, 535dec214d0STahsin Erdogan ext4_xattr_inode_get_hash(ea_inode), 536dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 537a6d05676STahsin Erdogan } 538dec214d0STahsin Erdogan out: 539e50e5129SAndreas Dilger iput(ea_inode); 540dec214d0STahsin Erdogan return err; 541e50e5129SAndreas Dilger } 542e50e5129SAndreas Dilger 543ac27a0ecSDave Kleikamp static int 544617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 545ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 546ac27a0ecSDave Kleikamp { 547ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 548617ba13bSMingming Cao struct ext4_xattr_entry *entry; 549ac27a0ecSDave Kleikamp size_t size; 5509496005dSTheodore Ts'o void *end; 551ac27a0ecSDave Kleikamp int error; 55247387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 553ac27a0ecSDave Kleikamp 554ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 555ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 556ac27a0ecSDave Kleikamp 557617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 558fb265c9cSTheodore Ts'o return -ENODATA; 559ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 560ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 561fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 562fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 563fb265c9cSTheodore Ts'o return PTR_ERR(bh); 564ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 565ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 566de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 567de05ca85STheodore Ts'o if (error) 568ac27a0ecSDave Kleikamp goto cleanup; 56947387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bh); 570ac27a0ecSDave Kleikamp entry = BFIRST(bh); 5719496005dSTheodore Ts'o end = bh->b_data + bh->b_size; 5729496005dSTheodore Ts'o error = xattr_find_entry(inode, &entry, end, name_index, name, 1); 573ac27a0ecSDave Kleikamp if (error) 574ac27a0ecSDave Kleikamp goto cleanup; 575ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 576ac27a0ecSDave Kleikamp error = -ERANGE; 57754dd0e0aSTheodore Ts'o if (unlikely(size > EXT4_XATTR_SIZE_MAX)) 57854dd0e0aSTheodore Ts'o goto cleanup; 57954dd0e0aSTheodore Ts'o if (buffer) { 580ac27a0ecSDave Kleikamp if (size > buffer_size) 581ac27a0ecSDave Kleikamp goto cleanup; 582e50e5129SAndreas Dilger if (entry->e_value_inum) { 583b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 584b9fc761eSTahsin Erdogan size); 585e50e5129SAndreas Dilger if (error) 586e50e5129SAndreas Dilger goto cleanup; 587e50e5129SAndreas Dilger } else { 58854dd0e0aSTheodore Ts'o u16 offset = le16_to_cpu(entry->e_value_offs); 58954dd0e0aSTheodore Ts'o void *p = bh->b_data + offset; 59054dd0e0aSTheodore Ts'o 59154dd0e0aSTheodore Ts'o if (unlikely(p + size > end)) 59254dd0e0aSTheodore Ts'o goto cleanup; 59354dd0e0aSTheodore Ts'o memcpy(buffer, p, size); 594e50e5129SAndreas Dilger } 595ac27a0ecSDave Kleikamp } 596ac27a0ecSDave Kleikamp error = size; 597ac27a0ecSDave Kleikamp 598ac27a0ecSDave Kleikamp cleanup: 599ac27a0ecSDave Kleikamp brelse(bh); 600ac27a0ecSDave Kleikamp return error; 601ac27a0ecSDave Kleikamp } 602ac27a0ecSDave Kleikamp 603879b3825STao Ma int 604617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 605ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 606ac27a0ecSDave Kleikamp { 607617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 608617ba13bSMingming Cao struct ext4_xattr_entry *entry; 609617ba13bSMingming Cao struct ext4_inode *raw_inode; 610617ba13bSMingming Cao struct ext4_iloc iloc; 611ac27a0ecSDave Kleikamp size_t size; 612ac27a0ecSDave Kleikamp void *end; 613ac27a0ecSDave Kleikamp int error; 614ac27a0ecSDave Kleikamp 61519f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 616ac27a0ecSDave Kleikamp return -ENODATA; 617617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 618ac27a0ecSDave Kleikamp if (error) 619ac27a0ecSDave Kleikamp return error; 620617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 621ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 622617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 6239e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 624ac27a0ecSDave Kleikamp if (error) 625ac27a0ecSDave Kleikamp goto cleanup; 6266ba644b9SEric Biggers entry = IFIRST(header); 6279496005dSTheodore Ts'o error = xattr_find_entry(inode, &entry, end, name_index, name, 0); 628ac27a0ecSDave Kleikamp if (error) 629ac27a0ecSDave Kleikamp goto cleanup; 630ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 631ac27a0ecSDave Kleikamp error = -ERANGE; 63254dd0e0aSTheodore Ts'o if (unlikely(size > EXT4_XATTR_SIZE_MAX)) 63354dd0e0aSTheodore Ts'o goto cleanup; 63454dd0e0aSTheodore Ts'o if (buffer) { 635ac27a0ecSDave Kleikamp if (size > buffer_size) 636ac27a0ecSDave Kleikamp goto cleanup; 637e50e5129SAndreas Dilger if (entry->e_value_inum) { 638b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 639b9fc761eSTahsin Erdogan size); 640e50e5129SAndreas Dilger if (error) 641e50e5129SAndreas Dilger goto cleanup; 642e50e5129SAndreas Dilger } else { 64354dd0e0aSTheodore Ts'o u16 offset = le16_to_cpu(entry->e_value_offs); 64454dd0e0aSTheodore Ts'o void *p = (void *)IFIRST(header) + offset; 64554dd0e0aSTheodore Ts'o 64654dd0e0aSTheodore Ts'o if (unlikely(p + size > end)) 64754dd0e0aSTheodore Ts'o goto cleanup; 64854dd0e0aSTheodore Ts'o memcpy(buffer, p, size); 649ac27a0ecSDave Kleikamp } 650e50e5129SAndreas Dilger } 651ac27a0ecSDave Kleikamp error = size; 652ac27a0ecSDave Kleikamp 653ac27a0ecSDave Kleikamp cleanup: 654ac27a0ecSDave Kleikamp brelse(iloc.bh); 655ac27a0ecSDave Kleikamp return error; 656ac27a0ecSDave Kleikamp } 657ac27a0ecSDave Kleikamp 658ac27a0ecSDave Kleikamp /* 659617ba13bSMingming Cao * ext4_xattr_get() 660ac27a0ecSDave Kleikamp * 661ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 662ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 663ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 664ac27a0ecSDave Kleikamp * 665ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 666ac27a0ecSDave Kleikamp * used / required on success. 667ac27a0ecSDave Kleikamp */ 668ac27a0ecSDave Kleikamp int 669617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 670ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 671ac27a0ecSDave Kleikamp { 672ac27a0ecSDave Kleikamp int error; 673ac27a0ecSDave Kleikamp 6740db1ff22STheodore Ts'o if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 6750db1ff22STheodore Ts'o return -EIO; 6760db1ff22STheodore Ts'o 677230b8c1aSZhang Zhen if (strlen(name) > 255) 678230b8c1aSZhang Zhen return -ERANGE; 679230b8c1aSZhang Zhen 680617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 681617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 682ac27a0ecSDave Kleikamp buffer_size); 683ac27a0ecSDave Kleikamp if (error == -ENODATA) 684617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 685ac27a0ecSDave Kleikamp buffer_size); 686617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 687ac27a0ecSDave Kleikamp return error; 688ac27a0ecSDave Kleikamp } 689ac27a0ecSDave Kleikamp 690ac27a0ecSDave Kleikamp static int 691431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 692ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 693ac27a0ecSDave Kleikamp { 694ac27a0ecSDave Kleikamp size_t rest = buffer_size; 695ac27a0ecSDave Kleikamp 696617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 69711e27528SStephen Hemminger const struct xattr_handler *handler = 698617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 699ac27a0ecSDave Kleikamp 700764a5c6bSAndreas Gruenbacher if (handler && (!handler->list || handler->list(dentry))) { 701764a5c6bSAndreas Gruenbacher const char *prefix = handler->prefix ?: handler->name; 702764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 703764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 704764a5c6bSAndreas Gruenbacher 705ac27a0ecSDave Kleikamp if (buffer) { 706ac27a0ecSDave Kleikamp if (size > rest) 707ac27a0ecSDave Kleikamp return -ERANGE; 708764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 709764a5c6bSAndreas Gruenbacher buffer += prefix_len; 710764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 711764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 712764a5c6bSAndreas Gruenbacher *buffer++ = 0; 713ac27a0ecSDave Kleikamp } 714ac27a0ecSDave Kleikamp rest -= size; 715ac27a0ecSDave Kleikamp } 716ac27a0ecSDave Kleikamp } 717764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 718ac27a0ecSDave Kleikamp } 719ac27a0ecSDave Kleikamp 720ac27a0ecSDave Kleikamp static int 721431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 722ac27a0ecSDave Kleikamp { 7232b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 724ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 725ac27a0ecSDave Kleikamp int error; 726ac27a0ecSDave Kleikamp 727ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 728ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 729ac27a0ecSDave Kleikamp 730617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 731fb265c9cSTheodore Ts'o return 0; 732ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 733ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 734fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 735fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 736fb265c9cSTheodore Ts'o return PTR_ERR(bh); 737ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 738ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 739de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 740de05ca85STheodore Ts'o if (error) 741ac27a0ecSDave Kleikamp goto cleanup; 74247387409STahsin Erdogan ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); 743fb265c9cSTheodore Ts'o error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, 744fb265c9cSTheodore Ts'o buffer_size); 745ac27a0ecSDave Kleikamp cleanup: 746ac27a0ecSDave Kleikamp brelse(bh); 747ac27a0ecSDave Kleikamp return error; 748ac27a0ecSDave Kleikamp } 749ac27a0ecSDave Kleikamp 750ac27a0ecSDave Kleikamp static int 751431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 752ac27a0ecSDave Kleikamp { 7532b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 754617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 755617ba13bSMingming Cao struct ext4_inode *raw_inode; 756617ba13bSMingming Cao struct ext4_iloc iloc; 757ac27a0ecSDave Kleikamp void *end; 758ac27a0ecSDave Kleikamp int error; 759ac27a0ecSDave Kleikamp 76019f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 761ac27a0ecSDave Kleikamp return 0; 762617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 763ac27a0ecSDave Kleikamp if (error) 764ac27a0ecSDave Kleikamp return error; 765617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 766ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 767617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 7689e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 769ac27a0ecSDave Kleikamp if (error) 770ac27a0ecSDave Kleikamp goto cleanup; 771431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 772ac27a0ecSDave Kleikamp buffer, buffer_size); 773ac27a0ecSDave Kleikamp 774ac27a0ecSDave Kleikamp cleanup: 775ac27a0ecSDave Kleikamp brelse(iloc.bh); 776ac27a0ecSDave Kleikamp return error; 777ac27a0ecSDave Kleikamp } 778ac27a0ecSDave Kleikamp 779ac27a0ecSDave Kleikamp /* 780ba7ea1d8SEric Biggers * Inode operation listxattr() 781ba7ea1d8SEric Biggers * 782ba7ea1d8SEric Biggers * d_inode(dentry)->i_rwsem: don't care 783ac27a0ecSDave Kleikamp * 784ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 785ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 786ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 787ac27a0ecSDave Kleikamp * 788ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 789ac27a0ecSDave Kleikamp * used / required on success. 790ac27a0ecSDave Kleikamp */ 791ba7ea1d8SEric Biggers ssize_t 792ba7ea1d8SEric Biggers ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) 793ac27a0ecSDave Kleikamp { 794eaeef867STheodore Ts'o int ret, ret2; 795ac27a0ecSDave Kleikamp 7962b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 797eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 798eaeef867STheodore Ts'o if (ret < 0) 799eaeef867STheodore Ts'o goto errout; 800ac27a0ecSDave Kleikamp if (buffer) { 801eaeef867STheodore Ts'o buffer += ret; 802eaeef867STheodore Ts'o buffer_size -= ret; 803ac27a0ecSDave Kleikamp } 804eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 805eaeef867STheodore Ts'o if (ret < 0) 806eaeef867STheodore Ts'o goto errout; 807eaeef867STheodore Ts'o ret += ret2; 808eaeef867STheodore Ts'o errout: 8092b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 810eaeef867STheodore Ts'o return ret; 811ac27a0ecSDave Kleikamp } 812ac27a0ecSDave Kleikamp 813ac27a0ecSDave Kleikamp /* 814617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 815ac27a0ecSDave Kleikamp * not set, set it. 816ac27a0ecSDave Kleikamp */ 817617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 818ac27a0ecSDave Kleikamp struct super_block *sb) 819ac27a0ecSDave Kleikamp { 820e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 821ac27a0ecSDave Kleikamp return; 822ac27a0ecSDave Kleikamp 8235d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 824188c299eSJan Kara if (ext4_journal_get_write_access(handle, sb, EXT4_SB(sb)->s_sbh, 825188c299eSJan Kara EXT4_JTR_NONE) == 0) { 82605c2c00fSJan Kara lock_buffer(EXT4_SB(sb)->s_sbh); 827e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 82805c2c00fSJan Kara ext4_superblock_csum_set(sb); 82905c2c00fSJan Kara unlock_buffer(EXT4_SB(sb)->s_sbh); 830a3f5cf14SJan Kara ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); 831ac27a0ecSDave Kleikamp } 832ac27a0ecSDave Kleikamp } 833ac27a0ecSDave Kleikamp 8347a9ca53aSTahsin Erdogan int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) 8357a9ca53aSTahsin Erdogan { 8367a9ca53aSTahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 8377a9ca53aSTahsin Erdogan struct buffer_head *bh = NULL; 8387a9ca53aSTahsin Erdogan struct ext4_inode *raw_inode; 8397a9ca53aSTahsin Erdogan struct ext4_xattr_ibody_header *header; 8407a9ca53aSTahsin Erdogan struct ext4_xattr_entry *entry; 8417a9ca53aSTahsin Erdogan qsize_t ea_inode_refs = 0; 8427a9ca53aSTahsin Erdogan void *end; 8437a9ca53aSTahsin Erdogan int ret; 8447a9ca53aSTahsin Erdogan 8457a9ca53aSTahsin Erdogan lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); 8467a9ca53aSTahsin Erdogan 8477a9ca53aSTahsin Erdogan if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 8487a9ca53aSTahsin Erdogan ret = ext4_get_inode_loc(inode, &iloc); 8497a9ca53aSTahsin Erdogan if (ret) 8507a9ca53aSTahsin Erdogan goto out; 8517a9ca53aSTahsin Erdogan raw_inode = ext4_raw_inode(&iloc); 8527a9ca53aSTahsin Erdogan header = IHDR(inode, raw_inode); 8537a9ca53aSTahsin Erdogan end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 8547a9ca53aSTahsin Erdogan ret = xattr_check_inode(inode, header, end); 8557a9ca53aSTahsin Erdogan if (ret) 8567a9ca53aSTahsin Erdogan goto out; 8577a9ca53aSTahsin Erdogan 8587a9ca53aSTahsin Erdogan for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); 8597a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 8607a9ca53aSTahsin Erdogan if (entry->e_value_inum) 8617a9ca53aSTahsin Erdogan ea_inode_refs++; 8627a9ca53aSTahsin Erdogan } 8637a9ca53aSTahsin Erdogan 8647a9ca53aSTahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 865fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 866fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 867fb265c9cSTheodore Ts'o ret = PTR_ERR(bh); 8687159a986SDan Carpenter bh = NULL; 8697a9ca53aSTahsin Erdogan goto out; 8707a9ca53aSTahsin Erdogan } 8717a9ca53aSTahsin Erdogan 872de05ca85STheodore Ts'o ret = ext4_xattr_check_block(inode, bh); 873de05ca85STheodore Ts'o if (ret) 8747a9ca53aSTahsin Erdogan goto out; 8757a9ca53aSTahsin Erdogan 8767a9ca53aSTahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 8777a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 8787a9ca53aSTahsin Erdogan if (entry->e_value_inum) 8797a9ca53aSTahsin Erdogan ea_inode_refs++; 8807a9ca53aSTahsin Erdogan } 8817a9ca53aSTahsin Erdogan *usage = ea_inode_refs + 1; 8827a9ca53aSTahsin Erdogan ret = 0; 8837a9ca53aSTahsin Erdogan out: 8847a9ca53aSTahsin Erdogan brelse(iloc.bh); 8857a9ca53aSTahsin Erdogan brelse(bh); 8867a9ca53aSTahsin Erdogan return ret; 8877a9ca53aSTahsin Erdogan } 8887a9ca53aSTahsin Erdogan 889dec214d0STahsin Erdogan static inline size_t round_up_cluster(struct inode *inode, size_t length) 890dec214d0STahsin Erdogan { 891dec214d0STahsin Erdogan struct super_block *sb = inode->i_sb; 892dec214d0STahsin Erdogan size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + 893dec214d0STahsin Erdogan inode->i_blkbits); 894dec214d0STahsin Erdogan size_t mask = ~(cluster_size - 1); 895dec214d0STahsin Erdogan 896dec214d0STahsin Erdogan return (length + cluster_size - 1) & mask; 897dec214d0STahsin Erdogan } 898dec214d0STahsin Erdogan 899dec214d0STahsin Erdogan static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) 900dec214d0STahsin Erdogan { 901dec214d0STahsin Erdogan int err; 902dec214d0STahsin Erdogan 903dec214d0STahsin Erdogan err = dquot_alloc_inode(inode); 904dec214d0STahsin Erdogan if (err) 905dec214d0STahsin Erdogan return err; 906dec214d0STahsin Erdogan err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); 907dec214d0STahsin Erdogan if (err) 908dec214d0STahsin Erdogan dquot_free_inode(inode); 909dec214d0STahsin Erdogan return err; 910dec214d0STahsin Erdogan } 911dec214d0STahsin Erdogan 912a6d05676STahsin Erdogan static void ext4_xattr_inode_free_quota(struct inode *parent, 913a6d05676STahsin Erdogan struct inode *ea_inode, 914a6d05676STahsin Erdogan size_t len) 915dec214d0STahsin Erdogan { 916a6d05676STahsin Erdogan if (ea_inode && 917a6d05676STahsin Erdogan ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) 918a6d05676STahsin Erdogan return; 919a6d05676STahsin Erdogan dquot_free_space_nodirty(parent, round_up_cluster(parent, len)); 920a6d05676STahsin Erdogan dquot_free_inode(parent); 921dec214d0STahsin Erdogan } 922dec214d0STahsin Erdogan 923af65207cSTahsin Erdogan int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode, 924af65207cSTahsin Erdogan struct buffer_head *block_bh, size_t value_len, 925af65207cSTahsin Erdogan bool is_create) 926dec214d0STahsin Erdogan { 927dec214d0STahsin Erdogan int credits; 928dec214d0STahsin Erdogan int blocks; 929dec214d0STahsin Erdogan 930dec214d0STahsin Erdogan /* 931dec214d0STahsin Erdogan * 1) Owner inode update 932dec214d0STahsin Erdogan * 2) Ref count update on old xattr block 933dec214d0STahsin Erdogan * 3) new xattr block 934dec214d0STahsin Erdogan * 4) block bitmap update for new xattr block 935dec214d0STahsin Erdogan * 5) group descriptor for new xattr block 936dec214d0STahsin Erdogan * 6) block bitmap update for old xattr block 937dec214d0STahsin Erdogan * 7) group descriptor for old block 938dec214d0STahsin Erdogan * 939dec214d0STahsin Erdogan * 6 & 7 can happen if we have two racing threads T_a and T_b 940dec214d0STahsin Erdogan * which are each trying to set an xattr on inodes I_a and I_b 941dec214d0STahsin Erdogan * which were both initially sharing an xattr block. 942dec214d0STahsin Erdogan */ 943dec214d0STahsin Erdogan credits = 7; 944dec214d0STahsin Erdogan 945dec214d0STahsin Erdogan /* Quota updates. */ 946dec214d0STahsin Erdogan credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); 947dec214d0STahsin Erdogan 948dec214d0STahsin Erdogan /* 949dec214d0STahsin Erdogan * In case of inline data, we may push out the data to a block, 950dec214d0STahsin Erdogan * so we need to reserve credits for this eventuality 951dec214d0STahsin Erdogan */ 952af65207cSTahsin Erdogan if (inode && ext4_has_inline_data(inode)) 953dec214d0STahsin Erdogan credits += ext4_writepage_trans_blocks(inode) + 1; 954dec214d0STahsin Erdogan 955dec214d0STahsin Erdogan /* We are done if ea_inode feature is not enabled. */ 956dec214d0STahsin Erdogan if (!ext4_has_feature_ea_inode(sb)) 957dec214d0STahsin Erdogan return credits; 958dec214d0STahsin Erdogan 959dec214d0STahsin Erdogan /* New ea_inode, inode map, block bitmap, group descriptor. */ 960dec214d0STahsin Erdogan credits += 4; 961dec214d0STahsin Erdogan 962dec214d0STahsin Erdogan /* Data blocks. */ 963dec214d0STahsin Erdogan blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 964dec214d0STahsin Erdogan 965dec214d0STahsin Erdogan /* Indirection block or one level of extent tree. */ 966dec214d0STahsin Erdogan blocks += 1; 967dec214d0STahsin Erdogan 968dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 969dec214d0STahsin Erdogan credits += blocks * 2; 970dec214d0STahsin Erdogan 971dec214d0STahsin Erdogan /* Blocks themselves. */ 972dec214d0STahsin Erdogan credits += blocks; 973dec214d0STahsin Erdogan 974af65207cSTahsin Erdogan if (!is_create) { 975dec214d0STahsin Erdogan /* Dereference ea_inode holding old xattr value. 976dec214d0STahsin Erdogan * Old ea_inode, inode map, block bitmap, group descriptor. 977dec214d0STahsin Erdogan */ 978dec214d0STahsin Erdogan credits += 4; 979dec214d0STahsin Erdogan 980dec214d0STahsin Erdogan /* Data blocks for old ea_inode. */ 981dec214d0STahsin Erdogan blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; 982dec214d0STahsin Erdogan 983af65207cSTahsin Erdogan /* Indirection block or one level of extent tree for old 984af65207cSTahsin Erdogan * ea_inode. 985af65207cSTahsin Erdogan */ 986dec214d0STahsin Erdogan blocks += 1; 987dec214d0STahsin Erdogan 988dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 989dec214d0STahsin Erdogan credits += blocks * 2; 990af65207cSTahsin Erdogan } 991dec214d0STahsin Erdogan 992dec214d0STahsin Erdogan /* We may need to clone the existing xattr block in which case we need 993dec214d0STahsin Erdogan * to increment ref counts for existing ea_inodes referenced by it. 994dec214d0STahsin Erdogan */ 995dec214d0STahsin Erdogan if (block_bh) { 996dec214d0STahsin Erdogan struct ext4_xattr_entry *entry = BFIRST(block_bh); 997dec214d0STahsin Erdogan 998dec214d0STahsin Erdogan for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) 999dec214d0STahsin Erdogan if (entry->e_value_inum) 1000dec214d0STahsin Erdogan /* Ref count update on ea_inode. */ 1001dec214d0STahsin Erdogan credits += 1; 1002dec214d0STahsin Erdogan } 1003dec214d0STahsin Erdogan return credits; 1004dec214d0STahsin Erdogan } 1005dec214d0STahsin Erdogan 1006dec214d0STahsin Erdogan static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, 1007dec214d0STahsin Erdogan int ref_change) 1008dec214d0STahsin Erdogan { 1009dec214d0STahsin Erdogan struct ext4_iloc iloc; 1010dec214d0STahsin Erdogan s64 ref_count; 1011dec214d0STahsin Erdogan int ret; 1012dec214d0STahsin Erdogan 1013dec214d0STahsin Erdogan inode_lock(ea_inode); 1014dec214d0STahsin Erdogan 1015dec214d0STahsin Erdogan ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); 10161bfc204dSVasily Averin if (ret) 1017dec214d0STahsin Erdogan goto out; 1018dec214d0STahsin Erdogan 1019dec214d0STahsin Erdogan ref_count = ext4_xattr_inode_get_ref(ea_inode); 1020dec214d0STahsin Erdogan ref_count += ref_change; 1021dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, ref_count); 1022dec214d0STahsin Erdogan 1023dec214d0STahsin Erdogan if (ref_change > 0) { 1024dec214d0STahsin Erdogan WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", 1025dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1026dec214d0STahsin Erdogan 1027dec214d0STahsin Erdogan if (ref_count == 1) { 1028dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", 1029dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1030dec214d0STahsin Erdogan 1031dec214d0STahsin Erdogan set_nlink(ea_inode, 1); 1032dec214d0STahsin Erdogan ext4_orphan_del(handle, ea_inode); 1033cdb7ee4cSTahsin Erdogan } 1034dec214d0STahsin Erdogan } else { 1035dec214d0STahsin Erdogan WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", 1036dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1037dec214d0STahsin Erdogan 1038dec214d0STahsin Erdogan if (ref_count == 0) { 1039dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink != 1, 1040dec214d0STahsin Erdogan "EA inode %lu i_nlink=%u", 1041dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1042dec214d0STahsin Erdogan 1043dec214d0STahsin Erdogan clear_nlink(ea_inode); 1044dec214d0STahsin Erdogan ext4_orphan_add(handle, ea_inode); 1045dec214d0STahsin Erdogan } 1046cdb7ee4cSTahsin Erdogan } 1047dec214d0STahsin Erdogan 1048dec214d0STahsin Erdogan ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); 1049dec214d0STahsin Erdogan if (ret) 1050dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 1051dec214d0STahsin Erdogan "ext4_mark_iloc_dirty() failed ret=%d", ret); 1052dec214d0STahsin Erdogan out: 1053dec214d0STahsin Erdogan inode_unlock(ea_inode); 1054dec214d0STahsin Erdogan return ret; 1055dec214d0STahsin Erdogan } 1056dec214d0STahsin Erdogan 1057dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) 1058dec214d0STahsin Erdogan { 1059dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, 1); 1060dec214d0STahsin Erdogan } 1061dec214d0STahsin Erdogan 1062dec214d0STahsin Erdogan static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) 1063dec214d0STahsin Erdogan { 1064dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, -1); 1065dec214d0STahsin Erdogan } 1066dec214d0STahsin Erdogan 1067dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, 1068dec214d0STahsin Erdogan struct ext4_xattr_entry *first) 1069dec214d0STahsin Erdogan { 1070dec214d0STahsin Erdogan struct inode *ea_inode; 1071dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 1072dec214d0STahsin Erdogan struct ext4_xattr_entry *failed_entry; 1073dec214d0STahsin Erdogan unsigned int ea_ino; 1074dec214d0STahsin Erdogan int err, saved_err; 1075dec214d0STahsin Erdogan 1076dec214d0STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 1077dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1078dec214d0STahsin Erdogan if (!entry->e_value_inum) 1079dec214d0STahsin Erdogan continue; 1080dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1081a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1082a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1083a6d05676STahsin Erdogan &ea_inode); 1084dec214d0STahsin Erdogan if (err) 1085dec214d0STahsin Erdogan goto cleanup; 1086dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1087dec214d0STahsin Erdogan if (err) { 1088dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "inc ref error %d", err); 1089dec214d0STahsin Erdogan iput(ea_inode); 1090dec214d0STahsin Erdogan goto cleanup; 1091dec214d0STahsin Erdogan } 1092dec214d0STahsin Erdogan iput(ea_inode); 1093dec214d0STahsin Erdogan } 1094dec214d0STahsin Erdogan return 0; 1095dec214d0STahsin Erdogan 1096dec214d0STahsin Erdogan cleanup: 1097dec214d0STahsin Erdogan saved_err = err; 1098dec214d0STahsin Erdogan failed_entry = entry; 1099dec214d0STahsin Erdogan 1100dec214d0STahsin Erdogan for (entry = first; entry != failed_entry; 1101dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1102dec214d0STahsin Erdogan if (!entry->e_value_inum) 1103dec214d0STahsin Erdogan continue; 1104dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1105a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1106a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1107a6d05676STahsin Erdogan &ea_inode); 1108dec214d0STahsin Erdogan if (err) { 1109dec214d0STahsin Erdogan ext4_warning(parent->i_sb, 1110dec214d0STahsin Erdogan "cleanup ea_ino %u iget error %d", ea_ino, 1111dec214d0STahsin Erdogan err); 1112dec214d0STahsin Erdogan continue; 1113dec214d0STahsin Erdogan } 1114dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1115dec214d0STahsin Erdogan if (err) 1116dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "cleanup dec ref error %d", 1117dec214d0STahsin Erdogan err); 1118dec214d0STahsin Erdogan iput(ea_inode); 1119dec214d0STahsin Erdogan } 1120dec214d0STahsin Erdogan return saved_err; 1121dec214d0STahsin Erdogan } 1122dec214d0STahsin Erdogan 1123a4130367SJan Kara static int ext4_xattr_restart_fn(handle_t *handle, struct inode *inode, 1124a4130367SJan Kara struct buffer_head *bh, bool block_csum, bool dirty) 1125a4130367SJan Kara { 1126a4130367SJan Kara int error; 1127a4130367SJan Kara 1128a4130367SJan Kara if (bh && dirty) { 1129a4130367SJan Kara if (block_csum) 1130a4130367SJan Kara ext4_xattr_block_csum_set(inode, bh); 1131a4130367SJan Kara error = ext4_handle_dirty_metadata(handle, NULL, bh); 1132a4130367SJan Kara if (error) { 1133a4130367SJan Kara ext4_warning(inode->i_sb, "Handle metadata (error %d)", 1134a4130367SJan Kara error); 1135a4130367SJan Kara return error; 1136a4130367SJan Kara } 1137a4130367SJan Kara } 1138a4130367SJan Kara return 0; 1139a4130367SJan Kara } 1140a4130367SJan Kara 114130a7eb97STahsin Erdogan static void 1142dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, 114330a7eb97STahsin Erdogan struct buffer_head *bh, 114430a7eb97STahsin Erdogan struct ext4_xattr_entry *first, bool block_csum, 114530a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1146dec214d0STahsin Erdogan int extra_credits, bool skip_quota) 114730a7eb97STahsin Erdogan { 114830a7eb97STahsin Erdogan struct inode *ea_inode; 114930a7eb97STahsin Erdogan struct ext4_xattr_entry *entry; 115030a7eb97STahsin Erdogan bool dirty = false; 115130a7eb97STahsin Erdogan unsigned int ea_ino; 115230a7eb97STahsin Erdogan int err; 115330a7eb97STahsin Erdogan int credits; 115430a7eb97STahsin Erdogan 115530a7eb97STahsin Erdogan /* One credit for dec ref on ea_inode, one for orphan list addition, */ 115630a7eb97STahsin Erdogan credits = 2 + extra_credits; 115730a7eb97STahsin Erdogan 115830a7eb97STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 115930a7eb97STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 116030a7eb97STahsin Erdogan if (!entry->e_value_inum) 116130a7eb97STahsin Erdogan continue; 116230a7eb97STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1163a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1164a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1165a6d05676STahsin Erdogan &ea_inode); 116630a7eb97STahsin Erdogan if (err) 116730a7eb97STahsin Erdogan continue; 116830a7eb97STahsin Erdogan 116930a7eb97STahsin Erdogan err = ext4_expand_inode_array(ea_inode_array, ea_inode); 117030a7eb97STahsin Erdogan if (err) { 117130a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, 117230a7eb97STahsin Erdogan "Expand inode array err=%d", err); 117330a7eb97STahsin Erdogan iput(ea_inode); 117430a7eb97STahsin Erdogan continue; 117530a7eb97STahsin Erdogan } 117630a7eb97STahsin Erdogan 1177a4130367SJan Kara err = ext4_journal_ensure_credits_fn(handle, credits, credits, 117883448bdfSJan Kara ext4_free_metadata_revoke_credits(parent->i_sb, 1), 1179a4130367SJan Kara ext4_xattr_restart_fn(handle, parent, bh, block_csum, 1180a4130367SJan Kara dirty)); 1181a4130367SJan Kara if (err < 0) { 118230a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, "Ensure credits err=%d", 118330a7eb97STahsin Erdogan err); 118430a7eb97STahsin Erdogan continue; 118530a7eb97STahsin Erdogan } 1186a4130367SJan Kara if (err > 0) { 1187188c299eSJan Kara err = ext4_journal_get_write_access(handle, 1188188c299eSJan Kara parent->i_sb, bh, EXT4_JTR_NONE); 1189a4130367SJan Kara if (err) { 1190a4130367SJan Kara ext4_warning_inode(ea_inode, 1191a4130367SJan Kara "Re-get write access err=%d", 1192a4130367SJan Kara err); 1193a4130367SJan Kara continue; 1194a4130367SJan Kara } 1195a4130367SJan Kara } 119630a7eb97STahsin Erdogan 1197dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1198dec214d0STahsin Erdogan if (err) { 1199dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", 1200dec214d0STahsin Erdogan err); 1201dec214d0STahsin Erdogan continue; 1202dec214d0STahsin Erdogan } 1203dec214d0STahsin Erdogan 1204dec214d0STahsin Erdogan if (!skip_quota) 1205a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(parent, ea_inode, 1206dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 120730a7eb97STahsin Erdogan 120830a7eb97STahsin Erdogan /* 120930a7eb97STahsin Erdogan * Forget about ea_inode within the same transaction that 121030a7eb97STahsin Erdogan * decrements the ref count. This avoids duplicate decrements in 121130a7eb97STahsin Erdogan * case the rest of the work spills over to subsequent 121230a7eb97STahsin Erdogan * transactions. 121330a7eb97STahsin Erdogan */ 121430a7eb97STahsin Erdogan entry->e_value_inum = 0; 121530a7eb97STahsin Erdogan entry->e_value_size = 0; 121630a7eb97STahsin Erdogan 121730a7eb97STahsin Erdogan dirty = true; 121830a7eb97STahsin Erdogan } 121930a7eb97STahsin Erdogan 122030a7eb97STahsin Erdogan if (dirty) { 122130a7eb97STahsin Erdogan /* 122230a7eb97STahsin Erdogan * Note that we are deliberately skipping csum calculation for 122330a7eb97STahsin Erdogan * the final update because we do not expect any journal 122430a7eb97STahsin Erdogan * restarts until xattr block is freed. 122530a7eb97STahsin Erdogan */ 122630a7eb97STahsin Erdogan 122730a7eb97STahsin Erdogan err = ext4_handle_dirty_metadata(handle, NULL, bh); 122830a7eb97STahsin Erdogan if (err) 122930a7eb97STahsin Erdogan ext4_warning_inode(parent, 123030a7eb97STahsin Erdogan "handle dirty metadata err=%d", err); 123130a7eb97STahsin Erdogan } 123230a7eb97STahsin Erdogan } 123330a7eb97STahsin Erdogan 1234ac27a0ecSDave Kleikamp /* 1235ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 1236ec4cb1aaSJan Kara * otherwise free the block. 1237ac27a0ecSDave Kleikamp */ 1238ac27a0ecSDave Kleikamp static void 1239617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 1240dec214d0STahsin Erdogan struct buffer_head *bh, 1241dec214d0STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1242dec214d0STahsin Erdogan int extra_credits) 1243ac27a0ecSDave Kleikamp { 124447387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 12456048c64bSAndreas Gruenbacher u32 hash, ref; 12468a2bfdcbSMingming Cao int error = 0; 1247ac27a0ecSDave Kleikamp 12485d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 1249188c299eSJan Kara error = ext4_journal_get_write_access(handle, inode->i_sb, bh, 1250188c299eSJan Kara EXT4_JTR_NONE); 12518a2bfdcbSMingming Cao if (error) 12528a2bfdcbSMingming Cao goto out; 12538a2bfdcbSMingming Cao 125465f8b800SJan Kara retry_ref: 12558a2bfdcbSMingming Cao lock_buffer(bh); 12566048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 12576048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 12586048c64bSAndreas Gruenbacher if (ref == 1) { 1259ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 126082939d79SJan Kara /* 126182939d79SJan Kara * This must happen under buffer lock for 126282939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 126382939d79SJan Kara */ 126465f8b800SJan Kara if (ea_block_cache) { 126565f8b800SJan Kara struct mb_cache_entry *oe; 126665f8b800SJan Kara 126765f8b800SJan Kara oe = mb_cache_entry_delete_or_get(ea_block_cache, hash, 1268cdb7ee4cSTahsin Erdogan bh->b_blocknr); 126965f8b800SJan Kara if (oe) { 127065f8b800SJan Kara unlock_buffer(bh); 127165f8b800SJan Kara mb_cache_entry_wait_unused(oe); 127265f8b800SJan Kara mb_cache_entry_put(ea_block_cache, oe); 127365f8b800SJan Kara goto retry_ref; 127465f8b800SJan Kara } 127565f8b800SJan Kara } 1276ac27a0ecSDave Kleikamp get_bh(bh); 1277ec4cb1aaSJan Kara unlock_buffer(bh); 1278dec214d0STahsin Erdogan 1279dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) 1280dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, bh, 1281dec214d0STahsin Erdogan BFIRST(bh), 1282dec214d0STahsin Erdogan true /* block_csum */, 1283dec214d0STahsin Erdogan ea_inode_array, 1284dec214d0STahsin Erdogan extra_credits, 1285dec214d0STahsin Erdogan true /* skip_quota */); 1286e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 1287e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 1288e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 1289ac27a0ecSDave Kleikamp } else { 12906048c64bSAndreas Gruenbacher ref--; 12916048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 12926048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 12936048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 12946048c64bSAndreas Gruenbacher 1295cdb7ee4cSTahsin Erdogan if (ea_block_cache) { 129647387409STahsin Erdogan ce = mb_cache_entry_get(ea_block_cache, hash, 12976048c64bSAndreas Gruenbacher bh->b_blocknr); 12986048c64bSAndreas Gruenbacher if (ce) { 1299a44e84a9SJan Kara set_bit(MBE_REUSABLE_B, &ce->e_flags); 130047387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 13016048c64bSAndreas Gruenbacher } 13026048c64bSAndreas Gruenbacher } 1303cdb7ee4cSTahsin Erdogan } 13046048c64bSAndreas Gruenbacher 1305dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bh); 1306ec4cb1aaSJan Kara /* 1307ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 1308ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 1309ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 1310ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 1311ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 1312dac7a4b4STheodore Ts'o * call ext4_handle_dirty_metadata() with locked buffer as 1313ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 1314ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 1315ec4cb1aaSJan Kara */ 1316ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 1317dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1318c1bb05a6SEric Sandeen unlock_buffer(bh); 1319ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 1320dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1321ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 13220390131bSFrank Mayhar ext4_handle_sync(handle); 13231231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 1324ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 1325ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 1326ac27a0ecSDave Kleikamp } 13278a2bfdcbSMingming Cao out: 13288a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 13298a2bfdcbSMingming Cao return; 1330ac27a0ecSDave Kleikamp } 1331ac27a0ecSDave Kleikamp 13326dd4ee7cSKalpak Shah /* 13336dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 13346dd4ee7cSKalpak Shah * bytes used by EA entries. 13356dd4ee7cSKalpak Shah */ 13366dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 13376dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 13386dd4ee7cSKalpak Shah { 13396dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1340e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 13416dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 13426dd4ee7cSKalpak Shah if (offs < *min_offs) 13436dd4ee7cSKalpak Shah *min_offs = offs; 13446dd4ee7cSKalpak Shah } 13457b1b2c1bSTheodore Ts'o if (total) 13467b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 13476dd4ee7cSKalpak Shah } 13486dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 13496dd4ee7cSKalpak Shah } 13506dd4ee7cSKalpak Shah 1351e50e5129SAndreas Dilger /* 1352e50e5129SAndreas Dilger * Write the value of the EA in an inode. 1353e50e5129SAndreas Dilger */ 1354e50e5129SAndreas Dilger static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, 1355e50e5129SAndreas Dilger const void *buf, int bufsize) 1356e50e5129SAndreas Dilger { 1357e50e5129SAndreas Dilger struct buffer_head *bh = NULL; 1358e50e5129SAndreas Dilger unsigned long block = 0; 1359dec214d0STahsin Erdogan int blocksize = ea_inode->i_sb->s_blocksize; 1360dec214d0STahsin Erdogan int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; 1361e50e5129SAndreas Dilger int csize, wsize = 0; 13624209ae12SHarshad Shirwadkar int ret = 0, ret2 = 0; 1363e50e5129SAndreas Dilger int retries = 0; 1364e50e5129SAndreas Dilger 1365e50e5129SAndreas Dilger retry: 1366e50e5129SAndreas Dilger while (ret >= 0 && ret < max_blocks) { 1367e50e5129SAndreas Dilger struct ext4_map_blocks map; 1368e50e5129SAndreas Dilger map.m_lblk = block += ret; 1369e50e5129SAndreas Dilger map.m_len = max_blocks -= ret; 1370e50e5129SAndreas Dilger 1371e50e5129SAndreas Dilger ret = ext4_map_blocks(handle, ea_inode, &map, 1372e50e5129SAndreas Dilger EXT4_GET_BLOCKS_CREATE); 1373e50e5129SAndreas Dilger if (ret <= 0) { 1374e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1375e50e5129SAndreas Dilger if (ret == -ENOSPC && 1376e50e5129SAndreas Dilger ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { 1377e50e5129SAndreas Dilger ret = 0; 1378e50e5129SAndreas Dilger goto retry; 1379e50e5129SAndreas Dilger } 1380e50e5129SAndreas Dilger break; 1381e50e5129SAndreas Dilger } 1382e50e5129SAndreas Dilger } 1383e50e5129SAndreas Dilger 1384e50e5129SAndreas Dilger if (ret < 0) 1385e50e5129SAndreas Dilger return ret; 1386e50e5129SAndreas Dilger 1387e50e5129SAndreas Dilger block = 0; 1388e50e5129SAndreas Dilger while (wsize < bufsize) { 1389e50e5129SAndreas Dilger brelse(bh); 1390e50e5129SAndreas Dilger csize = (bufsize - wsize) > blocksize ? blocksize : 1391e50e5129SAndreas Dilger bufsize - wsize; 1392e50e5129SAndreas Dilger bh = ext4_getblk(handle, ea_inode, block, 0); 1393e50e5129SAndreas Dilger if (IS_ERR(bh)) 1394e50e5129SAndreas Dilger return PTR_ERR(bh); 1395eb6984faSVasily Averin if (!bh) { 1396eb6984faSVasily Averin WARN_ON_ONCE(1); 1397eb6984faSVasily Averin EXT4_ERROR_INODE(ea_inode, 1398eb6984faSVasily Averin "ext4_getblk() return bh = NULL"); 1399eb6984faSVasily Averin return -EFSCORRUPTED; 1400eb6984faSVasily Averin } 1401188c299eSJan Kara ret = ext4_journal_get_write_access(handle, ea_inode->i_sb, bh, 1402188c299eSJan Kara EXT4_JTR_NONE); 1403e50e5129SAndreas Dilger if (ret) 1404e50e5129SAndreas Dilger goto out; 1405e50e5129SAndreas Dilger 1406e50e5129SAndreas Dilger memcpy(bh->b_data, buf, csize); 1407e50e5129SAndreas Dilger set_buffer_uptodate(bh); 1408e50e5129SAndreas Dilger ext4_handle_dirty_metadata(handle, ea_inode, bh); 1409e50e5129SAndreas Dilger 1410e50e5129SAndreas Dilger buf += csize; 1411e50e5129SAndreas Dilger wsize += csize; 1412e50e5129SAndreas Dilger block += 1; 1413e50e5129SAndreas Dilger } 1414e50e5129SAndreas Dilger 1415e50e5129SAndreas Dilger inode_lock(ea_inode); 1416e50e5129SAndreas Dilger i_size_write(ea_inode, wsize); 1417e50e5129SAndreas Dilger ext4_update_i_disksize(ea_inode, wsize); 1418e50e5129SAndreas Dilger inode_unlock(ea_inode); 1419e50e5129SAndreas Dilger 14204209ae12SHarshad Shirwadkar ret2 = ext4_mark_inode_dirty(handle, ea_inode); 14214209ae12SHarshad Shirwadkar if (unlikely(ret2 && !ret)) 14224209ae12SHarshad Shirwadkar ret = ret2; 1423e50e5129SAndreas Dilger 1424e50e5129SAndreas Dilger out: 1425e50e5129SAndreas Dilger brelse(bh); 1426e50e5129SAndreas Dilger 1427e50e5129SAndreas Dilger return ret; 1428e50e5129SAndreas Dilger } 1429e50e5129SAndreas Dilger 1430e50e5129SAndreas Dilger /* 1431e50e5129SAndreas Dilger * Create an inode to store the value of a large EA. 1432e50e5129SAndreas Dilger */ 1433e50e5129SAndreas Dilger static struct inode *ext4_xattr_inode_create(handle_t *handle, 1434dec214d0STahsin Erdogan struct inode *inode, u32 hash) 1435e50e5129SAndreas Dilger { 1436e50e5129SAndreas Dilger struct inode *ea_inode = NULL; 14379e1ba001STahsin Erdogan uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; 1438bd3b963bSTahsin Erdogan int err; 1439e50e5129SAndreas Dilger 1440e50e5129SAndreas Dilger /* 1441e50e5129SAndreas Dilger * Let the next inode be the goal, so we try and allocate the EA inode 1442e50e5129SAndreas Dilger * in the same group, or nearby one. 1443e50e5129SAndreas Dilger */ 1444e50e5129SAndreas Dilger ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, 14459e1ba001STahsin Erdogan S_IFREG | 0600, NULL, inode->i_ino + 1, owner, 14461b917ed8STahsin Erdogan EXT4_EA_INODE_FL); 1447e50e5129SAndreas Dilger if (!IS_ERR(ea_inode)) { 1448e50e5129SAndreas Dilger ea_inode->i_op = &ext4_file_inode_operations; 1449e50e5129SAndreas Dilger ea_inode->i_fop = &ext4_file_operations; 1450e50e5129SAndreas Dilger ext4_set_aops(ea_inode); 145133d201e0STahsin Erdogan ext4_xattr_inode_set_class(ea_inode); 1452e50e5129SAndreas Dilger unlock_new_inode(ea_inode); 1453dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, 1); 1454dec214d0STahsin Erdogan ext4_xattr_inode_set_hash(ea_inode, hash); 1455dec214d0STahsin Erdogan err = ext4_mark_inode_dirty(handle, ea_inode); 1456dec214d0STahsin Erdogan if (!err) 1457bd3b963bSTahsin Erdogan err = ext4_inode_attach_jinode(ea_inode); 1458bd3b963bSTahsin Erdogan if (err) { 1459e4db04f7SYe Bin if (ext4_xattr_inode_dec_ref(handle, ea_inode)) 1460e4db04f7SYe Bin ext4_warning_inode(ea_inode, 1461e4db04f7SYe Bin "cleanup dec ref error %d", err); 1462bd3b963bSTahsin Erdogan iput(ea_inode); 1463bd3b963bSTahsin Erdogan return ERR_PTR(err); 1464bd3b963bSTahsin Erdogan } 1465dec214d0STahsin Erdogan 1466dec214d0STahsin Erdogan /* 1467dec214d0STahsin Erdogan * Xattr inodes are shared therefore quota charging is performed 1468dec214d0STahsin Erdogan * at a higher level. 1469dec214d0STahsin Erdogan */ 1470dec214d0STahsin Erdogan dquot_free_inode(ea_inode); 1471dec214d0STahsin Erdogan dquot_drop(ea_inode); 1472dec214d0STahsin Erdogan inode_lock(ea_inode); 1473dec214d0STahsin Erdogan ea_inode->i_flags |= S_NOQUOTA; 1474dec214d0STahsin Erdogan inode_unlock(ea_inode); 1475e50e5129SAndreas Dilger } 1476e50e5129SAndreas Dilger 1477e50e5129SAndreas Dilger return ea_inode; 1478e50e5129SAndreas Dilger } 1479e50e5129SAndreas Dilger 1480dec214d0STahsin Erdogan static struct inode * 1481dec214d0STahsin Erdogan ext4_xattr_inode_cache_find(struct inode *inode, const void *value, 1482dec214d0STahsin Erdogan size_t value_len, u32 hash) 1483e50e5129SAndreas Dilger { 1484dec214d0STahsin Erdogan struct inode *ea_inode; 1485dec214d0STahsin Erdogan struct mb_cache_entry *ce; 1486dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 1487dec214d0STahsin Erdogan void *ea_data; 1488e50e5129SAndreas Dilger 1489cdb7ee4cSTahsin Erdogan if (!ea_inode_cache) 1490cdb7ee4cSTahsin Erdogan return NULL; 1491cdb7ee4cSTahsin Erdogan 1492dec214d0STahsin Erdogan ce = mb_cache_entry_find_first(ea_inode_cache, hash); 1493dec214d0STahsin Erdogan if (!ce) 1494dec214d0STahsin Erdogan return NULL; 1495e50e5129SAndreas Dilger 1496163f0ec1SJan Kara WARN_ON_ONCE(ext4_handle_valid(journal_current_handle()) && 1497163f0ec1SJan Kara !(current->flags & PF_MEMALLOC_NOFS)); 1498163f0ec1SJan Kara 149971b565ceSTheodore Ts'o ea_data = kvmalloc(value_len, GFP_KERNEL); 1500dec214d0STahsin Erdogan if (!ea_data) { 1501dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1502dec214d0STahsin Erdogan return NULL; 1503dec214d0STahsin Erdogan } 1504dec214d0STahsin Erdogan 1505dec214d0STahsin Erdogan while (ce) { 15068a363970STheodore Ts'o ea_inode = ext4_iget(inode->i_sb, ce->e_value, 15078a363970STheodore Ts'o EXT4_IGET_NORMAL); 1508dec214d0STahsin Erdogan if (!IS_ERR(ea_inode) && 1509dec214d0STahsin Erdogan !is_bad_inode(ea_inode) && 1510dec214d0STahsin Erdogan (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && 1511dec214d0STahsin Erdogan i_size_read(ea_inode) == value_len && 1512dec214d0STahsin Erdogan !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && 1513b9fc761eSTahsin Erdogan !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, 1514dec214d0STahsin Erdogan value_len) && 1515dec214d0STahsin Erdogan !memcmp(value, ea_data, value_len)) { 1516dec214d0STahsin Erdogan mb_cache_entry_touch(ea_inode_cache, ce); 1517dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1518dec214d0STahsin Erdogan kvfree(ea_data); 1519dec214d0STahsin Erdogan return ea_inode; 1520dec214d0STahsin Erdogan } 1521dec214d0STahsin Erdogan 1522dec214d0STahsin Erdogan if (!IS_ERR(ea_inode)) 1523e50e5129SAndreas Dilger iput(ea_inode); 1524dec214d0STahsin Erdogan ce = mb_cache_entry_find_next(ea_inode_cache, ce); 1525dec214d0STahsin Erdogan } 1526dec214d0STahsin Erdogan kvfree(ea_data); 1527dec214d0STahsin Erdogan return NULL; 1528e50e5129SAndreas Dilger } 1529e50e5129SAndreas Dilger 1530e50e5129SAndreas Dilger /* 1531e50e5129SAndreas Dilger * Add value of the EA in an inode. 1532e50e5129SAndreas Dilger */ 1533dec214d0STahsin Erdogan static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, 1534dec214d0STahsin Erdogan const void *value, size_t value_len, 1535dec214d0STahsin Erdogan struct inode **ret_inode) 1536e50e5129SAndreas Dilger { 1537e50e5129SAndreas Dilger struct inode *ea_inode; 1538dec214d0STahsin Erdogan u32 hash; 1539e50e5129SAndreas Dilger int err; 1540e50e5129SAndreas Dilger 1541dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); 1542dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); 1543dec214d0STahsin Erdogan if (ea_inode) { 1544dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1545dec214d0STahsin Erdogan if (err) { 1546dec214d0STahsin Erdogan iput(ea_inode); 1547dec214d0STahsin Erdogan return err; 1548dec214d0STahsin Erdogan } 1549dec214d0STahsin Erdogan 1550dec214d0STahsin Erdogan *ret_inode = ea_inode; 1551dec214d0STahsin Erdogan return 0; 1552dec214d0STahsin Erdogan } 1553dec214d0STahsin Erdogan 1554e50e5129SAndreas Dilger /* Create an inode for the EA value */ 1555dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_create(handle, inode, hash); 1556e50e5129SAndreas Dilger if (IS_ERR(ea_inode)) 1557e50e5129SAndreas Dilger return PTR_ERR(ea_inode); 1558e50e5129SAndreas Dilger 1559e50e5129SAndreas Dilger err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); 1560dec214d0STahsin Erdogan if (err) { 156156d0d0b9SLi Zhong if (ext4_xattr_inode_dec_ref(handle, ea_inode)) 156256d0d0b9SLi Zhong ext4_warning_inode(ea_inode, "cleanup dec ref error %d", err); 1563e50e5129SAndreas Dilger iput(ea_inode); 1564e50e5129SAndreas Dilger return err; 1565e50e5129SAndreas Dilger } 1566e50e5129SAndreas Dilger 1567cdb7ee4cSTahsin Erdogan if (EA_INODE_CACHE(inode)) 1568dec214d0STahsin Erdogan mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, 1569dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 1570dec214d0STahsin Erdogan 1571dec214d0STahsin Erdogan *ret_inode = ea_inode; 1572dec214d0STahsin Erdogan return 0; 1573dec214d0STahsin Erdogan } 1574dec214d0STahsin Erdogan 15759c6e7853STahsin Erdogan /* 15769c6e7853STahsin Erdogan * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode 15779c6e7853STahsin Erdogan * feature is enabled. 15789c6e7853STahsin Erdogan */ 15799c6e7853STahsin Erdogan #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) 15809c6e7853STahsin Erdogan 1581e50e5129SAndreas Dilger static int ext4_xattr_set_entry(struct ext4_xattr_info *i, 1582e50e5129SAndreas Dilger struct ext4_xattr_search *s, 1583daf83281STahsin Erdogan handle_t *handle, struct inode *inode, 1584daf83281STahsin Erdogan bool is_block) 1585ac27a0ecSDave Kleikamp { 15865369a762STheodore Ts'o struct ext4_xattr_entry *last, *next; 1587dec214d0STahsin Erdogan struct ext4_xattr_entry *here = s->here; 1588dec214d0STahsin Erdogan size_t min_offs = s->end - s->base, name_len = strlen(i->name); 1589e50e5129SAndreas Dilger int in_inode = i->in_inode; 1590dec214d0STahsin Erdogan struct inode *old_ea_inode = NULL; 1591dec214d0STahsin Erdogan struct inode *new_ea_inode = NULL; 1592dec214d0STahsin Erdogan size_t old_size, new_size; 1593dec214d0STahsin Erdogan int ret; 1594dec214d0STahsin Erdogan 1595dec214d0STahsin Erdogan /* Space used by old and new values. */ 1596dec214d0STahsin Erdogan old_size = (!s->not_found && !here->e_value_inum) ? 1597dec214d0STahsin Erdogan EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; 1598dec214d0STahsin Erdogan new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; 1599dec214d0STahsin Erdogan 1600dec214d0STahsin Erdogan /* 1601dec214d0STahsin Erdogan * Optimization for the simple case when old and new values have the 1602dec214d0STahsin Erdogan * same padded sizes. Not applicable if external inodes are involved. 1603dec214d0STahsin Erdogan */ 1604dec214d0STahsin Erdogan if (new_size && new_size == old_size) { 1605dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1606dec214d0STahsin Erdogan void *val = s->base + offs; 1607dec214d0STahsin Erdogan 1608dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1609dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1610dec214d0STahsin Erdogan memset(val, 0, new_size); 1611dec214d0STahsin Erdogan } else { 1612dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1613dec214d0STahsin Erdogan /* Clear padding bytes. */ 1614dec214d0STahsin Erdogan memset(val + i->value_len, 0, new_size - i->value_len); 1615dec214d0STahsin Erdogan } 161632aaf194STahsin Erdogan goto update_hash; 1617dec214d0STahsin Erdogan } 1618e50e5129SAndreas Dilger 1619ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 1620ac27a0ecSDave Kleikamp last = s->first; 16215369a762STheodore Ts'o for (; !IS_LAST_ENTRY(last); last = next) { 16225369a762STheodore Ts'o next = EXT4_XATTR_NEXT(last); 16235369a762STheodore Ts'o if ((void *)next >= s->end) { 16245369a762STheodore Ts'o EXT4_ERROR_INODE(inode, "corrupted xattr entries"); 16255369a762STheodore Ts'o ret = -EFSCORRUPTED; 16265369a762STheodore Ts'o goto out; 16275369a762STheodore Ts'o } 1628e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 1629ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 1630ac27a0ecSDave Kleikamp if (offs < min_offs) 1631ac27a0ecSDave Kleikamp min_offs = offs; 1632ac27a0ecSDave Kleikamp } 1633ac27a0ecSDave Kleikamp } 1634dec214d0STahsin Erdogan 1635dec214d0STahsin Erdogan /* Check whether we have enough space. */ 1636ac27a0ecSDave Kleikamp if (i->value) { 1637dec214d0STahsin Erdogan size_t free; 1638e50e5129SAndreas Dilger 1639dec214d0STahsin Erdogan free = min_offs - ((void *)last - s->base) - sizeof(__u32); 1640dec214d0STahsin Erdogan if (!s->not_found) 1641dec214d0STahsin Erdogan free += EXT4_XATTR_LEN(name_len) + old_size; 1642e50e5129SAndreas Dilger 1643dec214d0STahsin Erdogan if (free < EXT4_XATTR_LEN(name_len) + new_size) { 1644dec214d0STahsin Erdogan ret = -ENOSPC; 1645dec214d0STahsin Erdogan goto out; 1646dec214d0STahsin Erdogan } 16479c6e7853STahsin Erdogan 16489c6e7853STahsin Erdogan /* 16499c6e7853STahsin Erdogan * If storing the value in an external inode is an option, 16509c6e7853STahsin Erdogan * reserve space for xattr entries/names in the external 16519c6e7853STahsin Erdogan * attribute block so that a long value does not occupy the 16523088e5a5SBhaskar Chowdhury * whole space and prevent further entries being added. 16539c6e7853STahsin Erdogan */ 1654daf83281STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 1655daf83281STahsin Erdogan new_size && is_block && 16569c6e7853STahsin Erdogan (min_offs + old_size - new_size) < 16579c6e7853STahsin Erdogan EXT4_XATTR_BLOCK_RESERVE(inode)) { 16589c6e7853STahsin Erdogan ret = -ENOSPC; 16599c6e7853STahsin Erdogan goto out; 16609c6e7853STahsin Erdogan } 1661ac27a0ecSDave Kleikamp } 1662ac27a0ecSDave Kleikamp 1663dec214d0STahsin Erdogan /* 1664dec214d0STahsin Erdogan * Getting access to old and new ea inodes is subject to failures. 1665dec214d0STahsin Erdogan * Finish that work before doing any modifications to the xattr data. 1666dec214d0STahsin Erdogan */ 1667dec214d0STahsin Erdogan if (!s->not_found && here->e_value_inum) { 1668dec214d0STahsin Erdogan ret = ext4_xattr_inode_iget(inode, 1669dec214d0STahsin Erdogan le32_to_cpu(here->e_value_inum), 1670a6d05676STahsin Erdogan le32_to_cpu(here->e_hash), 1671dec214d0STahsin Erdogan &old_ea_inode); 1672dec214d0STahsin Erdogan if (ret) { 1673dec214d0STahsin Erdogan old_ea_inode = NULL; 1674dec214d0STahsin Erdogan goto out; 1675bd9926e8STheodore Ts'o } 1676dec214d0STahsin Erdogan } 1677dec214d0STahsin Erdogan if (i->value && in_inode) { 1678dec214d0STahsin Erdogan WARN_ON_ONCE(!i->value_len); 1679dec214d0STahsin Erdogan 1680dec214d0STahsin Erdogan ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); 1681dec214d0STahsin Erdogan if (ret) 1682dec214d0STahsin Erdogan goto out; 1683dec214d0STahsin Erdogan 1684dec214d0STahsin Erdogan ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, 1685dec214d0STahsin Erdogan i->value_len, 1686dec214d0STahsin Erdogan &new_ea_inode); 1687dec214d0STahsin Erdogan if (ret) { 1688dec214d0STahsin Erdogan new_ea_inode = NULL; 1689a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, NULL, i->value_len); 1690dec214d0STahsin Erdogan goto out; 1691dec214d0STahsin Erdogan } 1692ac27a0ecSDave Kleikamp } 1693ac27a0ecSDave Kleikamp 1694dec214d0STahsin Erdogan if (old_ea_inode) { 1695dec214d0STahsin Erdogan /* We are ready to release ref count on the old_ea_inode. */ 1696dec214d0STahsin Erdogan ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); 1697dec214d0STahsin Erdogan if (ret) { 1698dec214d0STahsin Erdogan /* Release newly required ref count on new_ea_inode. */ 1699dec214d0STahsin Erdogan if (new_ea_inode) { 1700dec214d0STahsin Erdogan int err; 1701dec214d0STahsin Erdogan 1702dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, 1703dec214d0STahsin Erdogan new_ea_inode); 1704dec214d0STahsin Erdogan if (err) 1705dec214d0STahsin Erdogan ext4_warning_inode(new_ea_inode, 1706dec214d0STahsin Erdogan "dec ref new_ea_inode err=%d", 1707dec214d0STahsin Erdogan err); 1708a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, new_ea_inode, 1709dec214d0STahsin Erdogan i->value_len); 1710dec214d0STahsin Erdogan } 1711dec214d0STahsin Erdogan goto out; 1712dec214d0STahsin Erdogan } 1713dec214d0STahsin Erdogan 1714a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, old_ea_inode, 1715dec214d0STahsin Erdogan le32_to_cpu(here->e_value_size)); 1716dec214d0STahsin Erdogan } 1717dec214d0STahsin Erdogan 1718dec214d0STahsin Erdogan /* No failures allowed past this point. */ 1719dec214d0STahsin Erdogan 1720e5d01196STheodore Ts'o if (!s->not_found && here->e_value_size && !here->e_value_inum) { 1721ac27a0ecSDave Kleikamp /* Remove the old value. */ 1722dec214d0STahsin Erdogan void *first_val = s->base + min_offs; 1723dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1724dec214d0STahsin Erdogan void *val = s->base + offs; 1725dec214d0STahsin Erdogan 1726dec214d0STahsin Erdogan memmove(first_val + old_size, first_val, val - first_val); 1727dec214d0STahsin Erdogan memset(first_val, 0, old_size); 1728dec214d0STahsin Erdogan min_offs += old_size; 1729ac27a0ecSDave Kleikamp 1730ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 1731ac27a0ecSDave Kleikamp last = s->first; 1732ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 1733ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 1734dec214d0STahsin Erdogan 1735e50e5129SAndreas Dilger if (!last->e_value_inum && 1736e50e5129SAndreas Dilger last->e_value_size && o < offs) 1737dec214d0STahsin Erdogan last->e_value_offs = cpu_to_le16(o + old_size); 1738617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 1739ac27a0ecSDave Kleikamp } 1740ac27a0ecSDave Kleikamp } 1741dec214d0STahsin Erdogan 1742ac27a0ecSDave Kleikamp if (!i->value) { 1743dec214d0STahsin Erdogan /* Remove old name. */ 1744617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 1745dec214d0STahsin Erdogan 1746ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 1747dec214d0STahsin Erdogan memmove(here, (void *)here + size, 1748dec214d0STahsin Erdogan (void *)last - (void *)here + sizeof(__u32)); 1749ac27a0ecSDave Kleikamp memset(last, 0, size); 1750dec214d0STahsin Erdogan } else if (s->not_found) { 1751dec214d0STahsin Erdogan /* Insert new name. */ 1752dec214d0STahsin Erdogan size_t size = EXT4_XATTR_LEN(name_len); 1753dec214d0STahsin Erdogan size_t rest = (void *)last - (void *)here + sizeof(__u32); 1754dec214d0STahsin Erdogan 1755dec214d0STahsin Erdogan memmove((void *)here + size, here, rest); 1756dec214d0STahsin Erdogan memset(here, 0, size); 1757dec214d0STahsin Erdogan here->e_name_index = i->name_index; 1758dec214d0STahsin Erdogan here->e_name_len = name_len; 1759dec214d0STahsin Erdogan memcpy(here->e_name, i->name, name_len); 1760dec214d0STahsin Erdogan } else { 1761dec214d0STahsin Erdogan /* This is an update, reset value info. */ 1762dec214d0STahsin Erdogan here->e_value_inum = 0; 1763dec214d0STahsin Erdogan here->e_value_offs = 0; 1764dec214d0STahsin Erdogan here->e_value_size = 0; 1765ac27a0ecSDave Kleikamp } 1766ac27a0ecSDave Kleikamp 1767ac27a0ecSDave Kleikamp if (i->value) { 1768dec214d0STahsin Erdogan /* Insert new value. */ 1769e50e5129SAndreas Dilger if (in_inode) { 1770dec214d0STahsin Erdogan here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); 1771e50e5129SAndreas Dilger } else if (i->value_len) { 1772dec214d0STahsin Erdogan void *val = s->base + min_offs - new_size; 1773e50e5129SAndreas Dilger 1774dec214d0STahsin Erdogan here->e_value_offs = cpu_to_le16(min_offs - new_size); 1775dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1776dec214d0STahsin Erdogan memset(val, 0, new_size); 1777dec214d0STahsin Erdogan } else { 1778dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1779dec214d0STahsin Erdogan /* Clear padding bytes. */ 1780dec214d0STahsin Erdogan memset(val + i->value_len, 0, 1781dec214d0STahsin Erdogan new_size - i->value_len); 1782dec214d0STahsin Erdogan } 1783dec214d0STahsin Erdogan } 1784dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1785dec214d0STahsin Erdogan } 1786daf83281STahsin Erdogan 178732aaf194STahsin Erdogan update_hash: 1788b9fc761eSTahsin Erdogan if (i->value) { 1789b9fc761eSTahsin Erdogan __le32 hash = 0; 1790b9fc761eSTahsin Erdogan 1791b9fc761eSTahsin Erdogan /* Entry hash calculation. */ 1792b9fc761eSTahsin Erdogan if (in_inode) { 1793b9fc761eSTahsin Erdogan __le32 crc32c_hash; 1794b9fc761eSTahsin Erdogan 1795b9fc761eSTahsin Erdogan /* 1796b9fc761eSTahsin Erdogan * Feed crc32c hash instead of the raw value for entry 1797b9fc761eSTahsin Erdogan * hash calculation. This is to avoid walking 1798b9fc761eSTahsin Erdogan * potentially long value buffer again. 1799b9fc761eSTahsin Erdogan */ 1800b9fc761eSTahsin Erdogan crc32c_hash = cpu_to_le32( 1801b9fc761eSTahsin Erdogan ext4_xattr_inode_get_hash(new_ea_inode)); 1802b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1803b9fc761eSTahsin Erdogan here->e_name_len, 1804b9fc761eSTahsin Erdogan &crc32c_hash, 1); 1805b9fc761eSTahsin Erdogan } else if (is_block) { 180632aaf194STahsin Erdogan __le32 *value = s->base + le16_to_cpu( 180732aaf194STahsin Erdogan here->e_value_offs); 1808b9fc761eSTahsin Erdogan 1809b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1810b9fc761eSTahsin Erdogan here->e_name_len, value, 1811b9fc761eSTahsin Erdogan new_size >> 2); 1812daf83281STahsin Erdogan } 1813b9fc761eSTahsin Erdogan here->e_hash = hash; 1814b9fc761eSTahsin Erdogan } 1815b9fc761eSTahsin Erdogan 1816b9fc761eSTahsin Erdogan if (is_block) 1817b9fc761eSTahsin Erdogan ext4_xattr_rehash((struct ext4_xattr_header *)s->base); 1818daf83281STahsin Erdogan 1819dec214d0STahsin Erdogan ret = 0; 1820e50e5129SAndreas Dilger out: 1821dec214d0STahsin Erdogan iput(old_ea_inode); 1822dec214d0STahsin Erdogan iput(new_ea_inode); 1823dec214d0STahsin Erdogan return ret; 1824ac27a0ecSDave Kleikamp } 1825ac27a0ecSDave Kleikamp 1826617ba13bSMingming Cao struct ext4_xattr_block_find { 1827617ba13bSMingming Cao struct ext4_xattr_search s; 1828ac27a0ecSDave Kleikamp struct buffer_head *bh; 1829ac27a0ecSDave Kleikamp }; 1830ac27a0ecSDave Kleikamp 1831ac27a0ecSDave Kleikamp static int 1832617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 1833617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1834ac27a0ecSDave Kleikamp { 1835ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1836ac27a0ecSDave Kleikamp int error; 1837ac27a0ecSDave Kleikamp 1838ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 1839ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 1840ac27a0ecSDave Kleikamp 1841617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 1842ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 1843fb265c9cSTheodore Ts'o bs->bh = ext4_sb_bread(sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 18448418897fSJeffle Xu if (IS_ERR(bs->bh)) { 18458418897fSJeffle Xu error = PTR_ERR(bs->bh); 18468418897fSJeffle Xu bs->bh = NULL; 18478418897fSJeffle Xu return error; 18488418897fSJeffle Xu } 1849ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 1850ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 1851ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 1852de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bs->bh); 1853de05ca85STheodore Ts'o if (error) 1854fb265c9cSTheodore Ts'o return error; 1855ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1856ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 1857ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 1858ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 1859ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 18609496005dSTheodore Ts'o error = xattr_find_entry(inode, &bs->s.here, bs->s.end, 18619496005dSTheodore Ts'o i->name_index, i->name, 1); 1862ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1863fb265c9cSTheodore Ts'o return error; 1864ac27a0ecSDave Kleikamp bs->s.not_found = error; 1865ac27a0ecSDave Kleikamp } 1866fb265c9cSTheodore Ts'o return 0; 1867ac27a0ecSDave Kleikamp } 1868ac27a0ecSDave Kleikamp 1869ac27a0ecSDave Kleikamp static int 1870617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 1871617ba13bSMingming Cao struct ext4_xattr_info *i, 1872617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1873ac27a0ecSDave Kleikamp { 1874ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1875ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 1876b347e2bcSTahsin Erdogan struct ext4_xattr_search s_copy = bs->s; 1877b347e2bcSTahsin Erdogan struct ext4_xattr_search *s = &s_copy; 18787a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 18798a2bfdcbSMingming Cao int error = 0; 188047387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 1881a6d05676STahsin Erdogan struct inode *ea_inode = NULL, *tmp_inode; 1882a6d05676STahsin Erdogan size_t old_ea_inode_quota = 0; 1883a6d05676STahsin Erdogan unsigned int ea_ino; 1884a6d05676STahsin Erdogan 1885ac27a0ecSDave Kleikamp 1886617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 1887ac27a0ecSDave Kleikamp 1888ac27a0ecSDave Kleikamp if (s->base) { 1889fd48e9acSJan Kara int offset = (char *)s->here - bs->bh->b_data; 1890fd48e9acSJan Kara 18915d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 1892188c299eSJan Kara error = ext4_journal_get_write_access(handle, sb, bs->bh, 1893188c299eSJan Kara EXT4_JTR_NONE); 18948a2bfdcbSMingming Cao if (error) 18958a2bfdcbSMingming Cao goto cleanup; 18968a2bfdcbSMingming Cao lock_buffer(bs->bh); 18978a2bfdcbSMingming Cao 1898ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 189982939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 190082939d79SJan Kara 190182939d79SJan Kara /* 190282939d79SJan Kara * This must happen under buffer lock for 190382939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 190482939d79SJan Kara * block 190582939d79SJan Kara */ 190665f8b800SJan Kara if (ea_block_cache) { 190765f8b800SJan Kara struct mb_cache_entry *oe; 190865f8b800SJan Kara 190965f8b800SJan Kara oe = mb_cache_entry_delete_or_get(ea_block_cache, 191065f8b800SJan Kara hash, bs->bh->b_blocknr); 191165f8b800SJan Kara if (oe) { 191265f8b800SJan Kara /* 191365f8b800SJan Kara * Xattr block is getting reused. Leave 191465f8b800SJan Kara * it alone. 191565f8b800SJan Kara */ 191665f8b800SJan Kara mb_cache_entry_put(ea_block_cache, oe); 191765f8b800SJan Kara goto clone_block; 191865f8b800SJan Kara } 191965f8b800SJan Kara } 1920ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 1921daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 1922daf83281STahsin Erdogan true /* is_block */); 1923dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bs->bh); 1924ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 19256a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1926ac27a0ecSDave Kleikamp goto bad_block; 1927ac27a0ecSDave Kleikamp if (!error) 1928dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 19290390131bSFrank Mayhar inode, 1930ac27a0ecSDave Kleikamp bs->bh); 1931ac27a0ecSDave Kleikamp if (error) 1932ac27a0ecSDave Kleikamp goto cleanup; 1933ac27a0ecSDave Kleikamp goto inserted; 1934fd48e9acSJan Kara } 193565f8b800SJan Kara clone_block: 19368a2bfdcbSMingming Cao unlock_buffer(bs->bh); 1937ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 19384efd9f0dSShuqi Zhang s->base = kmemdup(BHDR(bs->bh), bs->bh->b_size, GFP_NOFS); 1939ac27a0ecSDave Kleikamp error = -ENOMEM; 1940ac27a0ecSDave Kleikamp if (s->base == NULL) 1941ac27a0ecSDave Kleikamp goto cleanup; 1942ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1943ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1944ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 1945ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 1946dec214d0STahsin Erdogan 1947dec214d0STahsin Erdogan /* 1948dec214d0STahsin Erdogan * If existing entry points to an xattr inode, we need 1949dec214d0STahsin Erdogan * to prevent ext4_xattr_set_entry() from decrementing 1950dec214d0STahsin Erdogan * ref count on it because the reference belongs to the 1951dec214d0STahsin Erdogan * original block. In this case, make the entry look 1952dec214d0STahsin Erdogan * like it has an empty value. 1953dec214d0STahsin Erdogan */ 1954dec214d0STahsin Erdogan if (!s->not_found && s->here->e_value_inum) { 1955a6d05676STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 1956a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, 1957a6d05676STahsin Erdogan le32_to_cpu(s->here->e_hash), 1958a6d05676STahsin Erdogan &tmp_inode); 1959a6d05676STahsin Erdogan if (error) 1960a6d05676STahsin Erdogan goto cleanup; 1961a6d05676STahsin Erdogan 1962a6d05676STahsin Erdogan if (!ext4_test_inode_state(tmp_inode, 1963a6d05676STahsin Erdogan EXT4_STATE_LUSTRE_EA_INODE)) { 1964dec214d0STahsin Erdogan /* 1965a6d05676STahsin Erdogan * Defer quota free call for previous 1966a6d05676STahsin Erdogan * inode until success is guaranteed. 1967dec214d0STahsin Erdogan */ 1968a6d05676STahsin Erdogan old_ea_inode_quota = le32_to_cpu( 1969dec214d0STahsin Erdogan s->here->e_value_size); 1970a6d05676STahsin Erdogan } 1971a6d05676STahsin Erdogan iput(tmp_inode); 1972a6d05676STahsin Erdogan 1973dec214d0STahsin Erdogan s->here->e_value_inum = 0; 1974dec214d0STahsin Erdogan s->here->e_value_size = 0; 1975dec214d0STahsin Erdogan } 1976ac27a0ecSDave Kleikamp } else { 1977ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 1978216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 1979ac27a0ecSDave Kleikamp error = -ENOMEM; 1980ac27a0ecSDave Kleikamp if (s->base == NULL) 1981ac27a0ecSDave Kleikamp goto cleanup; 1982617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 1983ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 1984ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1985ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1986ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 1987ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 1988ac27a0ecSDave Kleikamp } 1989ac27a0ecSDave Kleikamp 1990daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); 19916a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1992ac27a0ecSDave Kleikamp goto bad_block; 1993ac27a0ecSDave Kleikamp if (error) 1994ac27a0ecSDave Kleikamp goto cleanup; 1995dec214d0STahsin Erdogan 1996dec214d0STahsin Erdogan if (i->value && s->here->e_value_inum) { 1997dec214d0STahsin Erdogan /* 1998dec214d0STahsin Erdogan * A ref count on ea_inode has been taken as part of the call to 1999dec214d0STahsin Erdogan * ext4_xattr_set_entry() above. We would like to drop this 2000dec214d0STahsin Erdogan * extra ref but we have to wait until the xattr block is 2001dec214d0STahsin Erdogan * initialized and has its own ref count on the ea_inode. 2002dec214d0STahsin Erdogan */ 2003dec214d0STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 2004a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, 2005a6d05676STahsin Erdogan le32_to_cpu(s->here->e_hash), 2006a6d05676STahsin Erdogan &ea_inode); 2007dec214d0STahsin Erdogan if (error) { 2008dec214d0STahsin Erdogan ea_inode = NULL; 2009dec214d0STahsin Erdogan goto cleanup; 2010dec214d0STahsin Erdogan } 2011dec214d0STahsin Erdogan } 2012dec214d0STahsin Erdogan 2013ac27a0ecSDave Kleikamp inserted: 2014ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 201547387409STahsin Erdogan new_bh = ext4_xattr_block_cache_find(inode, header(s->base), 201647387409STahsin Erdogan &ce); 2017ac27a0ecSDave Kleikamp if (new_bh) { 2018ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 2019ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 2020ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 2021ac27a0ecSDave Kleikamp else { 20226048c64bSAndreas Gruenbacher u32 ref; 20236048c64bSAndreas Gruenbacher 2024b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 2025b8cb5a54STahsin Erdogan 2026ac27a0ecSDave Kleikamp /* The old block is released after updating 2027ac27a0ecSDave Kleikamp the inode. */ 20281231b3a1SLukas Czerner error = dquot_alloc_block(inode, 20291231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 20305dd4056dSChristoph Hellwig if (error) 2031ac27a0ecSDave Kleikamp goto cleanup; 20325d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 2033188c299eSJan Kara error = ext4_journal_get_write_access( 2034188c299eSJan Kara handle, sb, new_bh, 2035188c299eSJan Kara EXT4_JTR_NONE); 2036ac27a0ecSDave Kleikamp if (error) 2037ac27a0ecSDave Kleikamp goto cleanup_dquot; 2038ac27a0ecSDave Kleikamp lock_buffer(new_bh); 203982939d79SJan Kara /* 204082939d79SJan Kara * We have to be careful about races with 204165f8b800SJan Kara * adding references to xattr block. Once we 204265f8b800SJan Kara * hold buffer lock xattr block's state is 204365f8b800SJan Kara * stable so we can check the additional 204465f8b800SJan Kara * reference fits. 204582939d79SJan Kara */ 204665f8b800SJan Kara ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 204765f8b800SJan Kara if (ref > EXT4_XATTR_REFCOUNT_MAX) { 204882939d79SJan Kara /* 204982939d79SJan Kara * Undo everything and check mbcache 205082939d79SJan Kara * again. 205182939d79SJan Kara */ 205282939d79SJan Kara unlock_buffer(new_bh); 205382939d79SJan Kara dquot_free_block(inode, 205482939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 205582939d79SJan Kara 1)); 205682939d79SJan Kara brelse(new_bh); 205747387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 205882939d79SJan Kara ce = NULL; 205982939d79SJan Kara new_bh = NULL; 206082939d79SJan Kara goto inserted; 206182939d79SJan Kara } 20626048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 206365f8b800SJan Kara if (ref == EXT4_XATTR_REFCOUNT_MAX) 2064a44e84a9SJan Kara clear_bit(MBE_REUSABLE_B, &ce->e_flags); 2065ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 20666048c64bSAndreas Gruenbacher ref); 2067dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2068ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2069dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 20700390131bSFrank Mayhar inode, 2071ac27a0ecSDave Kleikamp new_bh); 2072ac27a0ecSDave Kleikamp if (error) 2073ac27a0ecSDave Kleikamp goto cleanup_dquot; 2074ac27a0ecSDave Kleikamp } 207547387409STahsin Erdogan mb_cache_entry_touch(ea_block_cache, ce); 207647387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2077ac27a0ecSDave Kleikamp ce = NULL; 2078ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 2079ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 2080ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 2081ec000220STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); 2082ac27a0ecSDave Kleikamp new_bh = bs->bh; 2083ac27a0ecSDave Kleikamp get_bh(new_bh); 2084ac27a0ecSDave Kleikamp } else { 2085ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 2086fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 2087fb0a387dSEric Sandeen 2088b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 2089b8cb5a54STahsin Erdogan 2090fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 2091d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 209255f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 209355f020dbSAllison Henderson NULL, &error); 2094ac27a0ecSDave Kleikamp if (error) 2095ac27a0ecSDave Kleikamp goto cleanup; 2096fb0a387dSEric Sandeen 2097ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 2098ace36ad4SJoe Perches (unsigned long long)block); 2099ac27a0ecSDave Kleikamp 2100ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 2101aebf0243SWang Shilong if (unlikely(!new_bh)) { 2102860d21e2STheodore Ts'o error = -ENOMEM; 2103ac27a0ecSDave Kleikamp getblk_failed: 21047dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 2105e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 2106ac27a0ecSDave Kleikamp goto cleanup; 2107ac27a0ecSDave Kleikamp } 2108dec214d0STahsin Erdogan error = ext4_xattr_inode_inc_ref_all(handle, inode, 2109dec214d0STahsin Erdogan ENTRY(header(s->base)+1)); 2110dec214d0STahsin Erdogan if (error) 2111dec214d0STahsin Erdogan goto getblk_failed; 2112dec214d0STahsin Erdogan if (ea_inode) { 2113dec214d0STahsin Erdogan /* Drop the extra ref on ea_inode. */ 2114dec214d0STahsin Erdogan error = ext4_xattr_inode_dec_ref(handle, 2115dec214d0STahsin Erdogan ea_inode); 2116dec214d0STahsin Erdogan if (error) 2117dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 2118dec214d0STahsin Erdogan "dec ref error=%d", 2119dec214d0STahsin Erdogan error); 2120dec214d0STahsin Erdogan iput(ea_inode); 2121dec214d0STahsin Erdogan ea_inode = NULL; 2122dec214d0STahsin Erdogan } 2123dec214d0STahsin Erdogan 2124ac27a0ecSDave Kleikamp lock_buffer(new_bh); 2125188c299eSJan Kara error = ext4_journal_get_create_access(handle, sb, 2126188c299eSJan Kara new_bh, EXT4_JTR_NONE); 2127ac27a0ecSDave Kleikamp if (error) { 2128ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2129860d21e2STheodore Ts'o error = -EIO; 2130ac27a0ecSDave Kleikamp goto getblk_failed; 2131ac27a0ecSDave Kleikamp } 2132ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 2133dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2134ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 2135ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 213647387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, new_bh); 2137dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, 2138dac7a4b4STheodore Ts'o new_bh); 2139ac27a0ecSDave Kleikamp if (error) 2140ac27a0ecSDave Kleikamp goto cleanup; 2141ac27a0ecSDave Kleikamp } 2142ac27a0ecSDave Kleikamp } 2143ac27a0ecSDave Kleikamp 2144a6d05676STahsin Erdogan if (old_ea_inode_quota) 2145a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, NULL, old_ea_inode_quota); 2146dec214d0STahsin Erdogan 2147ac27a0ecSDave Kleikamp /* Update the inode. */ 2148617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 2149ac27a0ecSDave Kleikamp 2150ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 2151dec214d0STahsin Erdogan if (bs->bh && bs->bh != new_bh) { 2152dec214d0STahsin Erdogan struct ext4_xattr_inode_array *ea_inode_array = NULL; 2153dec214d0STahsin Erdogan 2154dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bs->bh, 2155dec214d0STahsin Erdogan &ea_inode_array, 2156dec214d0STahsin Erdogan 0 /* extra_credits */); 2157dec214d0STahsin Erdogan ext4_xattr_inode_array_free(ea_inode_array); 2158dec214d0STahsin Erdogan } 2159ac27a0ecSDave Kleikamp error = 0; 2160ac27a0ecSDave Kleikamp 2161ac27a0ecSDave Kleikamp cleanup: 2162dec214d0STahsin Erdogan if (ea_inode) { 2163dec214d0STahsin Erdogan int error2; 2164dec214d0STahsin Erdogan 2165dec214d0STahsin Erdogan error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); 2166dec214d0STahsin Erdogan if (error2) 2167dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "dec ref error=%d", 2168dec214d0STahsin Erdogan error2); 2169dec214d0STahsin Erdogan 2170dec214d0STahsin Erdogan /* If there was an error, revert the quota charge. */ 2171dec214d0STahsin Erdogan if (error) 2172a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, ea_inode, 2173dec214d0STahsin Erdogan i_size_read(ea_inode)); 2174dec214d0STahsin Erdogan iput(ea_inode); 2175dec214d0STahsin Erdogan } 2176ac27a0ecSDave Kleikamp if (ce) 217747387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2178ac27a0ecSDave Kleikamp brelse(new_bh); 2179ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 2180ac27a0ecSDave Kleikamp kfree(s->base); 2181ac27a0ecSDave Kleikamp 2182ac27a0ecSDave Kleikamp return error; 2183ac27a0ecSDave Kleikamp 2184ac27a0ecSDave Kleikamp cleanup_dquot: 21851231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 2186ac27a0ecSDave Kleikamp goto cleanup; 2187ac27a0ecSDave Kleikamp 2188ac27a0ecSDave Kleikamp bad_block: 218924676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 219024676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2191ac27a0ecSDave Kleikamp goto cleanup; 2192ac27a0ecSDave Kleikamp 2193ac27a0ecSDave Kleikamp #undef header 2194ac27a0ecSDave Kleikamp } 2195ac27a0ecSDave Kleikamp 2196879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 2197617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2198ac27a0ecSDave Kleikamp { 2199617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2200617ba13bSMingming Cao struct ext4_inode *raw_inode; 2201ac27a0ecSDave Kleikamp int error; 2202ac27a0ecSDave Kleikamp 220367d7d8adSBaokun Li if (!EXT4_INODE_HAS_XATTR_SPACE(inode)) 2204ac27a0ecSDave Kleikamp return 0; 220567d7d8adSBaokun Li 2206617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 2207ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 2208ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 2209ac27a0ecSDave Kleikamp is->s.here = is->s.first; 2210617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 221119f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 22129e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 2213ac27a0ecSDave Kleikamp if (error) 2214ac27a0ecSDave Kleikamp return error; 2215ac27a0ecSDave Kleikamp /* Find the named attribute. */ 22169496005dSTheodore Ts'o error = xattr_find_entry(inode, &is->s.here, is->s.end, 22179496005dSTheodore Ts'o i->name_index, i->name, 0); 2218ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 2219ac27a0ecSDave Kleikamp return error; 2220ac27a0ecSDave Kleikamp is->s.not_found = error; 2221ac27a0ecSDave Kleikamp } 2222ac27a0ecSDave Kleikamp return 0; 2223ac27a0ecSDave Kleikamp } 2224ac27a0ecSDave Kleikamp 2225310c097cSRitesh Harjani int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 2226617ba13bSMingming Cao struct ext4_xattr_info *i, 2227617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2228ac27a0ecSDave Kleikamp { 2229617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2230617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 2231ac27a0ecSDave Kleikamp int error; 2232ac27a0ecSDave Kleikamp 223367d7d8adSBaokun Li if (!EXT4_INODE_HAS_XATTR_SPACE(inode)) 2234ac27a0ecSDave Kleikamp return -ENOSPC; 223567d7d8adSBaokun Li 2236daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 2237ac27a0ecSDave Kleikamp if (error) 2238ac27a0ecSDave Kleikamp return error; 2239617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 2240ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 2241617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 224219f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 2243ac27a0ecSDave Kleikamp } else { 2244ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 224519f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 2246ac27a0ecSDave Kleikamp } 2247ac27a0ecSDave Kleikamp return 0; 2248ac27a0ecSDave Kleikamp } 2249ac27a0ecSDave Kleikamp 22503fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 22513fd16462SJan Kara struct ext4_xattr_info *i) 22523fd16462SJan Kara { 22533fd16462SJan Kara void *value; 22543fd16462SJan Kara 22550bd454c0STahsin Erdogan /* When e_value_inum is set the value is stored externally. */ 22560bd454c0STahsin Erdogan if (s->here->e_value_inum) 22570bd454c0STahsin Erdogan return 0; 22583fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 22593fd16462SJan Kara return 0; 22603fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 22613fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 22623fd16462SJan Kara } 22633fd16462SJan Kara 2264dec214d0STahsin Erdogan static struct buffer_head *ext4_xattr_get_block(struct inode *inode) 2265dec214d0STahsin Erdogan { 2266dec214d0STahsin Erdogan struct buffer_head *bh; 2267dec214d0STahsin Erdogan int error; 2268dec214d0STahsin Erdogan 2269dec214d0STahsin Erdogan if (!EXT4_I(inode)->i_file_acl) 2270dec214d0STahsin Erdogan return NULL; 2271fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2272fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 2273fb265c9cSTheodore Ts'o return bh; 2274dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2275ecaaf408SVasily Averin if (error) { 2276ecaaf408SVasily Averin brelse(bh); 2277dec214d0STahsin Erdogan return ERR_PTR(error); 2278ecaaf408SVasily Averin } 2279dec214d0STahsin Erdogan return bh; 2280dec214d0STahsin Erdogan } 2281dec214d0STahsin Erdogan 2282ac27a0ecSDave Kleikamp /* 2283617ba13bSMingming Cao * ext4_xattr_set_handle() 2284ac27a0ecSDave Kleikamp * 22856e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 2286ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 2287ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 2288ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 2289ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 2290ac27a0ecSDave Kleikamp * previous to the call, respectively. 2291ac27a0ecSDave Kleikamp * 2292ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2293ac27a0ecSDave Kleikamp */ 2294ac27a0ecSDave Kleikamp int 2295617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 2296ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 2297ac27a0ecSDave Kleikamp int flags) 2298ac27a0ecSDave Kleikamp { 2299617ba13bSMingming Cao struct ext4_xattr_info i = { 2300ac27a0ecSDave Kleikamp .name_index = name_index, 2301ac27a0ecSDave Kleikamp .name = name, 2302ac27a0ecSDave Kleikamp .value = value, 2303ac27a0ecSDave Kleikamp .value_len = value_len, 2304e50e5129SAndreas Dilger .in_inode = 0, 2305ac27a0ecSDave Kleikamp }; 2306617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 2307ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2308ac27a0ecSDave Kleikamp }; 2309617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 2310ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2311ac27a0ecSDave Kleikamp }; 2312c755e251STheodore Ts'o int no_expand; 2313ac27a0ecSDave Kleikamp int error; 2314ac27a0ecSDave Kleikamp 2315ac27a0ecSDave Kleikamp if (!name) 2316ac27a0ecSDave Kleikamp return -EINVAL; 2317ac27a0ecSDave Kleikamp if (strlen(name) > 255) 2318ac27a0ecSDave Kleikamp return -ERANGE; 2319b8cb5a54STahsin Erdogan 2320c755e251STheodore Ts'o ext4_write_lock_xattr(inode, &no_expand); 23214d20c685SKalpak Shah 2322c1a5d5f6STahsin Erdogan /* Check journal credits under write lock. */ 2323c1a5d5f6STahsin Erdogan if (ext4_handle_valid(handle)) { 2324dec214d0STahsin Erdogan struct buffer_head *bh; 2325c1a5d5f6STahsin Erdogan int credits; 2326c1a5d5f6STahsin Erdogan 2327dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2328dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2329dec214d0STahsin Erdogan error = PTR_ERR(bh); 2330dec214d0STahsin Erdogan goto cleanup; 2331dec214d0STahsin Erdogan } 2332dec214d0STahsin Erdogan 2333af65207cSTahsin Erdogan credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2334af65207cSTahsin Erdogan value_len, 2335af65207cSTahsin Erdogan flags & XATTR_CREATE); 2336dec214d0STahsin Erdogan brelse(bh); 2337dec214d0STahsin Erdogan 2338a9a8344eSJan Kara if (jbd2_handle_buffer_credits(handle) < credits) { 2339c1a5d5f6STahsin Erdogan error = -ENOSPC; 2340c1a5d5f6STahsin Erdogan goto cleanup; 2341c1a5d5f6STahsin Erdogan } 2342163f0ec1SJan Kara WARN_ON_ONCE(!(current->flags & PF_MEMALLOC_NOFS)); 2343c1a5d5f6STahsin Erdogan } 2344c1a5d5f6STahsin Erdogan 234566543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 234686ebfd08SEric Sandeen if (error) 234786ebfd08SEric Sandeen goto cleanup; 234886ebfd08SEric Sandeen 234919f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 2350617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 2351617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 235219f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 2353ac27a0ecSDave Kleikamp } 2354ac27a0ecSDave Kleikamp 2355617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 2356ac27a0ecSDave Kleikamp if (error) 2357ac27a0ecSDave Kleikamp goto cleanup; 2358ac27a0ecSDave Kleikamp if (is.s.not_found) 2359617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 2360ac27a0ecSDave Kleikamp if (error) 2361ac27a0ecSDave Kleikamp goto cleanup; 2362ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 2363ac27a0ecSDave Kleikamp error = -ENODATA; 2364ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 2365ac27a0ecSDave Kleikamp goto cleanup; 2366ac27a0ecSDave Kleikamp error = 0; 2367ac27a0ecSDave Kleikamp if (!value) 2368ac27a0ecSDave Kleikamp goto cleanup; 2369ac27a0ecSDave Kleikamp } else { 2370ac27a0ecSDave Kleikamp error = -EEXIST; 2371ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 2372ac27a0ecSDave Kleikamp goto cleanup; 2373ac27a0ecSDave Kleikamp } 2374dec214d0STahsin Erdogan 2375ac27a0ecSDave Kleikamp if (!value) { 2376ac27a0ecSDave Kleikamp if (!is.s.not_found) 2377e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2378ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 2379617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2380ac27a0ecSDave Kleikamp } else { 23813fd16462SJan Kara error = 0; 23823fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 23833fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 23843fd16462SJan Kara goto cleanup; 23853fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 23863fd16462SJan Kara goto cleanup; 23873fd16462SJan Kara 2388b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2389b347e2bcSTahsin Erdogan (EXT4_XATTR_SIZE(i.value_len) > 2390b347e2bcSTahsin Erdogan EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) 2391b347e2bcSTahsin Erdogan i.in_inode = 1; 2392b347e2bcSTahsin Erdogan retry_inode: 2393e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2394ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 2395ac27a0ecSDave Kleikamp i.value = NULL; 2396617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2397ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 23987e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 239945ae932dSVasily Averin brelse(bs.bh); 240045ae932dSVasily Averin bs.bh = NULL; 24017e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 24027e01c8e5STiger Yang if (error) 24037e01c8e5STiger Yang goto cleanup; 24047e01c8e5STiger Yang } 2405617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2406b347e2bcSTahsin Erdogan if (!error && !is.s.not_found) { 2407ac27a0ecSDave Kleikamp i.value = NULL; 2408e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, 2409e50e5129SAndreas Dilger &is); 2410b347e2bcSTahsin Erdogan } else if (error == -ENOSPC) { 2411b347e2bcSTahsin Erdogan /* 2412b347e2bcSTahsin Erdogan * Xattr does not fit in the block, store at 2413b347e2bcSTahsin Erdogan * external inode if possible. 2414b347e2bcSTahsin Erdogan */ 2415b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 24166b224899Szhangyi (F) i.value_len && !i.in_inode) { 2417b347e2bcSTahsin Erdogan i.in_inode = 1; 2418b347e2bcSTahsin Erdogan goto retry_inode; 2419b347e2bcSTahsin Erdogan } 2420ac27a0ecSDave Kleikamp } 2421ac27a0ecSDave Kleikamp } 2422ac27a0ecSDave Kleikamp } 2423ac27a0ecSDave Kleikamp if (!error) { 2424617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 2425eeca7ea1SDeepa Dinamani inode->i_ctime = current_time(inode); 2426a642c2c0SJeff Layton inode_inc_iversion(inode); 24276dd4ee7cSKalpak Shah if (!value) 2428c755e251STheodore Ts'o no_expand = 0; 2429617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 2430ac27a0ecSDave Kleikamp /* 2431617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 2432ac27a0ecSDave Kleikamp * error != 0. 2433ac27a0ecSDave Kleikamp */ 2434ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 2435ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 24360390131bSFrank Mayhar ext4_handle_sync(handle); 2437ac27a0ecSDave Kleikamp } 2438e85c81baSXin Yin ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, handle); 2439ac27a0ecSDave Kleikamp 2440ac27a0ecSDave Kleikamp cleanup: 2441ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 2442ac27a0ecSDave Kleikamp brelse(bs.bh); 2443c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 2444ac27a0ecSDave Kleikamp return error; 2445ac27a0ecSDave Kleikamp } 2446ac27a0ecSDave Kleikamp 2447af65207cSTahsin Erdogan int ext4_xattr_set_credits(struct inode *inode, size_t value_len, 2448af65207cSTahsin Erdogan bool is_create, int *credits) 2449c1a5d5f6STahsin Erdogan { 2450dec214d0STahsin Erdogan struct buffer_head *bh; 2451dec214d0STahsin Erdogan int err; 2452c1a5d5f6STahsin Erdogan 2453dec214d0STahsin Erdogan *credits = 0; 2454dec214d0STahsin Erdogan 2455dec214d0STahsin Erdogan if (!EXT4_SB(inode->i_sb)->s_journal) 2456c1a5d5f6STahsin Erdogan return 0; 2457c1a5d5f6STahsin Erdogan 2458dec214d0STahsin Erdogan down_read(&EXT4_I(inode)->xattr_sem); 2459c1a5d5f6STahsin Erdogan 2460dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2461dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2462dec214d0STahsin Erdogan err = PTR_ERR(bh); 2463dec214d0STahsin Erdogan } else { 2464af65207cSTahsin Erdogan *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2465af65207cSTahsin Erdogan value_len, is_create); 2466dec214d0STahsin Erdogan brelse(bh); 2467dec214d0STahsin Erdogan err = 0; 2468c1a5d5f6STahsin Erdogan } 2469dec214d0STahsin Erdogan 2470dec214d0STahsin Erdogan up_read(&EXT4_I(inode)->xattr_sem); 2471dec214d0STahsin Erdogan return err; 2472c1a5d5f6STahsin Erdogan } 2473c1a5d5f6STahsin Erdogan 2474ac27a0ecSDave Kleikamp /* 2475617ba13bSMingming Cao * ext4_xattr_set() 2476ac27a0ecSDave Kleikamp * 2477617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 2478ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 2479ac27a0ecSDave Kleikamp * 2480ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2481ac27a0ecSDave Kleikamp */ 2482ac27a0ecSDave Kleikamp int 2483617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 2484ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 2485ac27a0ecSDave Kleikamp { 2486ac27a0ecSDave Kleikamp handle_t *handle; 2487e50e5129SAndreas Dilger struct super_block *sb = inode->i_sb; 2488ac27a0ecSDave Kleikamp int error, retries = 0; 2489c1a5d5f6STahsin Erdogan int credits; 2490ac27a0ecSDave Kleikamp 2491b8cb5a54STahsin Erdogan error = dquot_initialize(inode); 2492b8cb5a54STahsin Erdogan if (error) 2493b8cb5a54STahsin Erdogan return error; 2494e50e5129SAndreas Dilger 2495ac27a0ecSDave Kleikamp retry: 2496af65207cSTahsin Erdogan error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, 2497af65207cSTahsin Erdogan &credits); 2498dec214d0STahsin Erdogan if (error) 2499dec214d0STahsin Erdogan return error; 2500dec214d0STahsin Erdogan 25019924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 2502ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 2503ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 2504ac27a0ecSDave Kleikamp } else { 2505ac27a0ecSDave Kleikamp int error2; 2506ac27a0ecSDave Kleikamp 2507617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 2508ac27a0ecSDave Kleikamp value, value_len, flags); 2509617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 2510ac27a0ecSDave Kleikamp if (error == -ENOSPC && 2511e50e5129SAndreas Dilger ext4_should_retry_alloc(sb, &retries)) 2512ac27a0ecSDave Kleikamp goto retry; 2513ac27a0ecSDave Kleikamp if (error == 0) 2514ac27a0ecSDave Kleikamp error = error2; 2515ac27a0ecSDave Kleikamp } 2516e85c81baSXin Yin ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, NULL); 2517ac27a0ecSDave Kleikamp 2518ac27a0ecSDave Kleikamp return error; 2519ac27a0ecSDave Kleikamp } 2520ac27a0ecSDave Kleikamp 2521ac27a0ecSDave Kleikamp /* 25226dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 25236dd4ee7cSKalpak Shah * i_extra_isize. 25246dd4ee7cSKalpak Shah */ 25256dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 25266dd4ee7cSKalpak Shah int value_offs_shift, void *to, 252794405713SJan Kara void *from, size_t n) 25286dd4ee7cSKalpak Shah { 25296dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 25306dd4ee7cSKalpak Shah int new_offs; 25316dd4ee7cSKalpak Shah 253294405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 253394405713SJan Kara BUG_ON(value_offs_shift > 0); 253494405713SJan Kara 25356dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 25366dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 2537e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 25386dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 25396dd4ee7cSKalpak Shah value_offs_shift; 25406dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 25416dd4ee7cSKalpak Shah } 25426dd4ee7cSKalpak Shah } 25436dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 25446dd4ee7cSKalpak Shah memmove(to, from, n); 25456dd4ee7cSKalpak Shah } 25466dd4ee7cSKalpak Shah 25476dd4ee7cSKalpak Shah /* 25483f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 25493f2571c1SJan Kara */ 25503f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 25513f2571c1SJan Kara struct ext4_inode *raw_inode, 25523f2571c1SJan Kara struct ext4_xattr_entry *entry) 25533f2571c1SJan Kara { 25543f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 25553f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 25563f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 2557f6109100STahsin Erdogan size_t value_size = le32_to_cpu(entry->e_value_size); 25583f2571c1SJan Kara struct ext4_xattr_info i = { 25593f2571c1SJan Kara .value = NULL, 25603f2571c1SJan Kara .value_len = 0, 25613f2571c1SJan Kara .name_index = entry->e_name_index, 2562f6109100STahsin Erdogan .in_inode = !!entry->e_value_inum, 25633f2571c1SJan Kara }; 25643f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 25653f2571c1SJan Kara int error; 25663f2571c1SJan Kara 25673f2571c1SJan Kara is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 25683f2571c1SJan Kara bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 2569cc12a6f2SYe Bin buffer = kvmalloc(value_size, GFP_NOFS); 25703f2571c1SJan Kara b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 25713f2571c1SJan Kara if (!is || !bs || !buffer || !b_entry_name) { 25723f2571c1SJan Kara error = -ENOMEM; 25733f2571c1SJan Kara goto out; 25743f2571c1SJan Kara } 25753f2571c1SJan Kara 25763f2571c1SJan Kara is->s.not_found = -ENODATA; 25773f2571c1SJan Kara bs->s.not_found = -ENODATA; 25783f2571c1SJan Kara is->iloc.bh = NULL; 25793f2571c1SJan Kara bs->bh = NULL; 25803f2571c1SJan Kara 25813f2571c1SJan Kara /* Save the entry name and the entry value */ 2582f6109100STahsin Erdogan if (entry->e_value_inum) { 2583b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, value_size); 2584f6109100STahsin Erdogan if (error) 2585f6109100STahsin Erdogan goto out; 2586f6109100STahsin Erdogan } else { 2587f6109100STahsin Erdogan size_t value_offs = le16_to_cpu(entry->e_value_offs); 25883f2571c1SJan Kara memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); 2589f6109100STahsin Erdogan } 2590f6109100STahsin Erdogan 25913f2571c1SJan Kara memcpy(b_entry_name, entry->e_name, entry->e_name_len); 25923f2571c1SJan Kara b_entry_name[entry->e_name_len] = '\0'; 25933f2571c1SJan Kara i.name = b_entry_name; 25943f2571c1SJan Kara 25953f2571c1SJan Kara error = ext4_get_inode_loc(inode, &is->iloc); 25963f2571c1SJan Kara if (error) 25973f2571c1SJan Kara goto out; 25983f2571c1SJan Kara 25993f2571c1SJan Kara error = ext4_xattr_ibody_find(inode, &i, is); 26003f2571c1SJan Kara if (error) 26013f2571c1SJan Kara goto out; 26023f2571c1SJan Kara 26033f2571c1SJan Kara /* Remove the chosen entry from the inode */ 2604e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, is); 26053f2571c1SJan Kara if (error) 26063f2571c1SJan Kara goto out; 26073f2571c1SJan Kara 26083f2571c1SJan Kara i.value = buffer; 26093f2571c1SJan Kara i.value_len = value_size; 26103f2571c1SJan Kara error = ext4_xattr_block_find(inode, &i, bs); 26113f2571c1SJan Kara if (error) 26123f2571c1SJan Kara goto out; 26133f2571c1SJan Kara 26143f2571c1SJan Kara /* Add entry which was removed from the inode into the block */ 26153f2571c1SJan Kara error = ext4_xattr_block_set(handle, inode, &i, bs); 26163f2571c1SJan Kara if (error) 26173f2571c1SJan Kara goto out; 26183f2571c1SJan Kara error = 0; 26193f2571c1SJan Kara out: 26203f2571c1SJan Kara kfree(b_entry_name); 2621cc12a6f2SYe Bin kvfree(buffer); 26223f2571c1SJan Kara if (is) 26233f2571c1SJan Kara brelse(is->iloc.bh); 26246bdc9977SVasily Averin if (bs) 26256bdc9977SVasily Averin brelse(bs->bh); 26263f2571c1SJan Kara kfree(is); 26273f2571c1SJan Kara kfree(bs); 26283f2571c1SJan Kara 26293f2571c1SJan Kara return error; 26303f2571c1SJan Kara } 26313f2571c1SJan Kara 2632dfa2064bSJan Kara static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, 2633dfa2064bSJan Kara struct ext4_inode *raw_inode, 2634dfa2064bSJan Kara int isize_diff, size_t ifree, 2635dfa2064bSJan Kara size_t bfree, int *total_ino) 2636dfa2064bSJan Kara { 2637dfa2064bSJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 2638dfa2064bSJan Kara struct ext4_xattr_entry *small_entry; 2639dfa2064bSJan Kara struct ext4_xattr_entry *entry; 2640dfa2064bSJan Kara struct ext4_xattr_entry *last; 2641dfa2064bSJan Kara unsigned int entry_size; /* EA entry size */ 2642dfa2064bSJan Kara unsigned int total_size; /* EA entry size + value size */ 2643dfa2064bSJan Kara unsigned int min_total_size; 2644dfa2064bSJan Kara int error; 2645dfa2064bSJan Kara 2646dfa2064bSJan Kara while (isize_diff > ifree) { 2647dfa2064bSJan Kara entry = NULL; 2648dfa2064bSJan Kara small_entry = NULL; 2649dfa2064bSJan Kara min_total_size = ~0U; 2650dfa2064bSJan Kara last = IFIRST(header); 2651dfa2064bSJan Kara /* Find the entry best suited to be pushed into EA block */ 2652dfa2064bSJan Kara for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 26538cdb5240STheodore Ts'o /* never move system.data out of the inode */ 26548cdb5240STheodore Ts'o if ((last->e_name_len == 4) && 26558cdb5240STheodore Ts'o (last->e_name_index == EXT4_XATTR_INDEX_SYSTEM) && 26568cdb5240STheodore Ts'o !memcmp(last->e_name, "data", 4)) 26578cdb5240STheodore Ts'o continue; 26589bb21cedSTahsin Erdogan total_size = EXT4_XATTR_LEN(last->e_name_len); 26599bb21cedSTahsin Erdogan if (!last->e_value_inum) 26609bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 26619bb21cedSTahsin Erdogan le32_to_cpu(last->e_value_size)); 2662dfa2064bSJan Kara if (total_size <= bfree && 2663dfa2064bSJan Kara total_size < min_total_size) { 2664dfa2064bSJan Kara if (total_size + ifree < isize_diff) { 2665dfa2064bSJan Kara small_entry = last; 2666dfa2064bSJan Kara } else { 2667dfa2064bSJan Kara entry = last; 2668dfa2064bSJan Kara min_total_size = total_size; 2669dfa2064bSJan Kara } 2670dfa2064bSJan Kara } 2671dfa2064bSJan Kara } 2672dfa2064bSJan Kara 2673dfa2064bSJan Kara if (entry == NULL) { 2674dfa2064bSJan Kara if (small_entry == NULL) 2675dfa2064bSJan Kara return -ENOSPC; 2676dfa2064bSJan Kara entry = small_entry; 2677dfa2064bSJan Kara } 2678dfa2064bSJan Kara 2679dfa2064bSJan Kara entry_size = EXT4_XATTR_LEN(entry->e_name_len); 26809bb21cedSTahsin Erdogan total_size = entry_size; 26819bb21cedSTahsin Erdogan if (!entry->e_value_inum) 26829bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 26839bb21cedSTahsin Erdogan le32_to_cpu(entry->e_value_size)); 2684dfa2064bSJan Kara error = ext4_xattr_move_to_block(handle, inode, raw_inode, 2685dfa2064bSJan Kara entry); 2686dfa2064bSJan Kara if (error) 2687dfa2064bSJan Kara return error; 2688dfa2064bSJan Kara 2689dfa2064bSJan Kara *total_ino -= entry_size; 2690dfa2064bSJan Kara ifree += total_size; 2691dfa2064bSJan Kara bfree -= total_size; 2692dfa2064bSJan Kara } 2693dfa2064bSJan Kara 2694dfa2064bSJan Kara return 0; 2695dfa2064bSJan Kara } 2696dfa2064bSJan Kara 26973f2571c1SJan Kara /* 26986dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 26996dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 27006dd4ee7cSKalpak Shah */ 27016dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 27026dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 27036dd4ee7cSKalpak Shah { 27046dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 2705cf0a5e81SMiao Xie struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 2706cf0a5e81SMiao Xie static unsigned int mnt_count; 2707e3014d14SJan Kara size_t min_offs; 2708e3014d14SJan Kara size_t ifree, bfree; 27097b1b2c1bSTheodore Ts'o int total_ino; 27106e0cd088SJan Kara void *base, *end; 2711d0141191SJan Kara int error = 0, tried_min_extra_isize = 0; 2712cf0a5e81SMiao Xie int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); 2713d0141191SJan Kara int isize_diff; /* How much do we need to grow i_extra_isize */ 2714c755e251STheodore Ts'o 27156dd4ee7cSKalpak Shah retry: 2716d0141191SJan Kara isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; 27172e81a4eeSJan Kara if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) 2718b640b2c5SMiao Xie return 0; 27196dd4ee7cSKalpak Shah 27206dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 27216dd4ee7cSKalpak Shah 27226dd4ee7cSKalpak Shah /* 27236dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 27246dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 27256dd4ee7cSKalpak Shah */ 27266dd4ee7cSKalpak Shah 27276e0cd088SJan Kara base = IFIRST(header); 27286dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 27296dd4ee7cSKalpak Shah min_offs = end - base; 2730a805622aSTheodore Ts'o total_ino = sizeof(struct ext4_xattr_ibody_header) + sizeof(u32); 27316dd4ee7cSKalpak Shah 27329e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 27339e92f48cSTheodore Ts'o if (error) 27349e92f48cSTheodore Ts'o goto cleanup; 27359e92f48cSTheodore Ts'o 27366e0cd088SJan Kara ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); 2737e3014d14SJan Kara if (ifree >= isize_diff) 2738e3014d14SJan Kara goto shift; 27396dd4ee7cSKalpak Shah 27406dd4ee7cSKalpak Shah /* 27416dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 27426dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 27436dd4ee7cSKalpak Shah */ 27446dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 274553692ec0SVasily Averin struct buffer_head *bh; 274653692ec0SVasily Averin 2747fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2748fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 2749fb265c9cSTheodore Ts'o error = PTR_ERR(bh); 27506dd4ee7cSKalpak Shah goto cleanup; 2751fb265c9cSTheodore Ts'o } 2752de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 275353692ec0SVasily Averin if (error) { 275453692ec0SVasily Averin brelse(bh); 27556dd4ee7cSKalpak Shah goto cleanup; 275653692ec0SVasily Averin } 27576dd4ee7cSKalpak Shah base = BHDR(bh); 27586dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 27596dd4ee7cSKalpak Shah min_offs = end - base; 27606e0cd088SJan Kara bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, 27616e0cd088SJan Kara NULL); 2762b640b2c5SMiao Xie brelse(bh); 2763e3014d14SJan Kara if (bfree + ifree < isize_diff) { 27646dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 27656dd4ee7cSKalpak Shah tried_min_extra_isize++; 27666dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 27676dd4ee7cSKalpak Shah goto retry; 27686dd4ee7cSKalpak Shah } 2769dfa2064bSJan Kara error = -ENOSPC; 27706dd4ee7cSKalpak Shah goto cleanup; 27716dd4ee7cSKalpak Shah } 27726dd4ee7cSKalpak Shah } else { 2773e3014d14SJan Kara bfree = inode->i_sb->s_blocksize; 27746dd4ee7cSKalpak Shah } 27756dd4ee7cSKalpak Shah 2776dfa2064bSJan Kara error = ext4_xattr_make_inode_space(handle, inode, raw_inode, 2777dfa2064bSJan Kara isize_diff, ifree, bfree, 2778dfa2064bSJan Kara &total_ino); 2779dfa2064bSJan Kara if (error) { 2780dfa2064bSJan Kara if (error == -ENOSPC && !tried_min_extra_isize && 27816dd4ee7cSKalpak Shah s_min_extra_isize) { 27826dd4ee7cSKalpak Shah tried_min_extra_isize++; 27836dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 27846dd4ee7cSKalpak Shah goto retry; 27856dd4ee7cSKalpak Shah } 27866dd4ee7cSKalpak Shah goto cleanup; 27876dd4ee7cSKalpak Shah } 2788e3014d14SJan Kara shift: 2789e3014d14SJan Kara /* Adjust the offsets and shift the remaining entries ahead */ 27906e0cd088SJan Kara ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize 2791e3014d14SJan Kara - new_extra_isize, (void *)raw_inode + 2792e3014d14SJan Kara EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 279394405713SJan Kara (void *)header, total_ino); 2794e3014d14SJan Kara EXT4_I(inode)->i_extra_isize = new_extra_isize; 27956dd4ee7cSKalpak Shah 27966dd4ee7cSKalpak Shah cleanup: 2797b640b2c5SMiao Xie if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) { 2798cf0a5e81SMiao Xie ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", 2799cf0a5e81SMiao Xie inode->i_ino); 2800cf0a5e81SMiao Xie mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); 2801cf0a5e81SMiao Xie } 28026dd4ee7cSKalpak Shah return error; 28036dd4ee7cSKalpak Shah } 28046dd4ee7cSKalpak Shah 2805e50e5129SAndreas Dilger #define EIA_INCR 16 /* must be 2^n */ 2806e50e5129SAndreas Dilger #define EIA_MASK (EIA_INCR - 1) 2807dec214d0STahsin Erdogan 2808dec214d0STahsin Erdogan /* Add the large xattr @inode into @ea_inode_array for deferred iput(). 28090421a189STahsin Erdogan * If @ea_inode_array is new or full it will be grown and the old 2810e50e5129SAndreas Dilger * contents copied over. 2811e50e5129SAndreas Dilger */ 2812e50e5129SAndreas Dilger static int 28130421a189STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 28140421a189STahsin Erdogan struct inode *inode) 2815e50e5129SAndreas Dilger { 28160421a189STahsin Erdogan if (*ea_inode_array == NULL) { 2817e50e5129SAndreas Dilger /* 2818e50e5129SAndreas Dilger * Start with 15 inodes, so it fits into a power-of-two size. 28190421a189STahsin Erdogan * If *ea_inode_array is NULL, this is essentially offsetof() 2820e50e5129SAndreas Dilger */ 28210421a189STahsin Erdogan (*ea_inode_array) = 28220421a189STahsin Erdogan kmalloc(offsetof(struct ext4_xattr_inode_array, 28230421a189STahsin Erdogan inodes[EIA_MASK]), 2824e50e5129SAndreas Dilger GFP_NOFS); 28250421a189STahsin Erdogan if (*ea_inode_array == NULL) 2826e50e5129SAndreas Dilger return -ENOMEM; 28270421a189STahsin Erdogan (*ea_inode_array)->count = 0; 28280421a189STahsin Erdogan } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { 2829e50e5129SAndreas Dilger /* expand the array once all 15 + n * 16 slots are full */ 28300421a189STahsin Erdogan struct ext4_xattr_inode_array *new_array = NULL; 28310421a189STahsin Erdogan int count = (*ea_inode_array)->count; 2832e50e5129SAndreas Dilger 2833e50e5129SAndreas Dilger /* if new_array is NULL, this is essentially offsetof() */ 2834e50e5129SAndreas Dilger new_array = kmalloc( 28350421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, 28360421a189STahsin Erdogan inodes[count + EIA_INCR]), 2837e50e5129SAndreas Dilger GFP_NOFS); 2838e50e5129SAndreas Dilger if (new_array == NULL) 2839e50e5129SAndreas Dilger return -ENOMEM; 28400421a189STahsin Erdogan memcpy(new_array, *ea_inode_array, 28410421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, inodes[count])); 28420421a189STahsin Erdogan kfree(*ea_inode_array); 28430421a189STahsin Erdogan *ea_inode_array = new_array; 2844e50e5129SAndreas Dilger } 28450421a189STahsin Erdogan (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; 2846e50e5129SAndreas Dilger return 0; 2847e50e5129SAndreas Dilger } 2848e50e5129SAndreas Dilger 28496dd4ee7cSKalpak Shah /* 2850617ba13bSMingming Cao * ext4_xattr_delete_inode() 2851ac27a0ecSDave Kleikamp * 2852e50e5129SAndreas Dilger * Free extended attribute resources associated with this inode. Traverse 2853dec214d0STahsin Erdogan * all entries and decrement reference on any xattr inodes associated with this 2854dec214d0STahsin Erdogan * inode. This is called immediately before an inode is freed. We have exclusive 2855dec214d0STahsin Erdogan * access to the inode. If an orphan inode is deleted it will also release its 2856dec214d0STahsin Erdogan * references on xattr block and xattr inodes. 2857ac27a0ecSDave Kleikamp */ 2858dec214d0STahsin Erdogan int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, 285930a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 286030a7eb97STahsin Erdogan int extra_credits) 2861ac27a0ecSDave Kleikamp { 2862ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 2863e50e5129SAndreas Dilger struct ext4_xattr_ibody_header *header; 286430a7eb97STahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 2865dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 2866a6d05676STahsin Erdogan struct inode *ea_inode; 286730a7eb97STahsin Erdogan int error; 286830a7eb97STahsin Erdogan 286983448bdfSJan Kara error = ext4_journal_ensure_credits(handle, extra_credits, 287083448bdfSJan Kara ext4_free_metadata_revoke_credits(inode->i_sb, 1)); 2871a4130367SJan Kara if (error < 0) { 287230a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); 287330a7eb97STahsin Erdogan goto cleanup; 287430a7eb97STahsin Erdogan } 2875ac27a0ecSDave Kleikamp 2876dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2877dec214d0STahsin Erdogan ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 2878e50e5129SAndreas Dilger 2879e50e5129SAndreas Dilger error = ext4_get_inode_loc(inode, &iloc); 2880dec214d0STahsin Erdogan if (error) { 2881dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); 2882e50e5129SAndreas Dilger goto cleanup; 2883e50e5129SAndreas Dilger } 2884dec214d0STahsin Erdogan 2885188c299eSJan Kara error = ext4_journal_get_write_access(handle, inode->i_sb, 2886188c299eSJan Kara iloc.bh, EXT4_JTR_NONE); 2887dec214d0STahsin Erdogan if (error) { 2888dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "write access (error %d)", 2889dec214d0STahsin Erdogan error); 2890dec214d0STahsin Erdogan goto cleanup; 2891dec214d0STahsin Erdogan } 2892dec214d0STahsin Erdogan 2893dec214d0STahsin Erdogan header = IHDR(inode, ext4_raw_inode(&iloc)); 2894dec214d0STahsin Erdogan if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) 2895dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, 2896dec214d0STahsin Erdogan IFIRST(header), 2897dec214d0STahsin Erdogan false /* block_csum */, 2898dec214d0STahsin Erdogan ea_inode_array, 2899dec214d0STahsin Erdogan extra_credits, 2900dec214d0STahsin Erdogan false /* skip_quota */); 2901dec214d0STahsin Erdogan } 2902dec214d0STahsin Erdogan 2903dec214d0STahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 2904fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2905fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 2906fb265c9cSTheodore Ts'o error = PTR_ERR(bh); 2907878520acSTheodore Ts'o if (error == -EIO) { 290854d3adbcSTheodore Ts'o EXT4_ERROR_INODE_ERR(inode, EIO, 290954d3adbcSTheodore Ts'o "block %llu read error", 291024676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2911878520acSTheodore Ts'o } 29127159a986SDan Carpenter bh = NULL; 2913ac27a0ecSDave Kleikamp goto cleanup; 2914ac27a0ecSDave Kleikamp } 2915dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2916de05ca85STheodore Ts'o if (error) 2917ac27a0ecSDave Kleikamp goto cleanup; 2918e50e5129SAndreas Dilger 291930a7eb97STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) { 2920dec214d0STahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 2921a6d05676STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 2922a6d05676STahsin Erdogan if (!entry->e_value_inum) 2923a6d05676STahsin Erdogan continue; 2924a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, 2925a6d05676STahsin Erdogan le32_to_cpu(entry->e_value_inum), 2926a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 2927a6d05676STahsin Erdogan &ea_inode); 2928a6d05676STahsin Erdogan if (error) 2929a6d05676STahsin Erdogan continue; 2930a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, ea_inode, 2931dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 2932a6d05676STahsin Erdogan iput(ea_inode); 2933a6d05676STahsin Erdogan } 2934dec214d0STahsin Erdogan 2935e50e5129SAndreas Dilger } 2936e50e5129SAndreas Dilger 2937dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bh, ea_inode_array, 2938dec214d0STahsin Erdogan extra_credits); 2939dec214d0STahsin Erdogan /* 2940dec214d0STahsin Erdogan * Update i_file_acl value in the same transaction that releases 2941dec214d0STahsin Erdogan * block. 2942dec214d0STahsin Erdogan */ 2943617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 294430a7eb97STahsin Erdogan error = ext4_mark_inode_dirty(handle, inode); 294530a7eb97STahsin Erdogan if (error) { 294630a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", 294730a7eb97STahsin Erdogan error); 294830a7eb97STahsin Erdogan goto cleanup; 294930a7eb97STahsin Erdogan } 2950e85c81baSXin Yin ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, handle); 2951dec214d0STahsin Erdogan } 2952dec214d0STahsin Erdogan error = 0; 2953ac27a0ecSDave Kleikamp cleanup: 295430a7eb97STahsin Erdogan brelse(iloc.bh); 2955ac27a0ecSDave Kleikamp brelse(bh); 2956e50e5129SAndreas Dilger return error; 2957e50e5129SAndreas Dilger } 2958e50e5129SAndreas Dilger 29590421a189STahsin Erdogan void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) 2960e50e5129SAndreas Dilger { 2961dec214d0STahsin Erdogan int idx; 2962e50e5129SAndreas Dilger 29630421a189STahsin Erdogan if (ea_inode_array == NULL) 2964e50e5129SAndreas Dilger return; 2965e50e5129SAndreas Dilger 2966dec214d0STahsin Erdogan for (idx = 0; idx < ea_inode_array->count; ++idx) 2967dec214d0STahsin Erdogan iput(ea_inode_array->inodes[idx]); 29680421a189STahsin Erdogan kfree(ea_inode_array); 2969ac27a0ecSDave Kleikamp } 2970ac27a0ecSDave Kleikamp 2971ac27a0ecSDave Kleikamp /* 297247387409STahsin Erdogan * ext4_xattr_block_cache_insert() 2973ac27a0ecSDave Kleikamp * 297447387409STahsin Erdogan * Create a new entry in the extended attribute block cache, and insert 2975ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 2976ac27a0ecSDave Kleikamp * 2977ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2978ac27a0ecSDave Kleikamp */ 2979ac27a0ecSDave Kleikamp static void 298047387409STahsin Erdogan ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, 298147387409STahsin Erdogan struct buffer_head *bh) 2982ac27a0ecSDave Kleikamp { 29836048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 29846048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 29856048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 29866048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 2987ac27a0ecSDave Kleikamp int error; 2988ac27a0ecSDave Kleikamp 2989cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 2990cdb7ee4cSTahsin Erdogan return; 299147387409STahsin Erdogan error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, 29926048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 2993ac27a0ecSDave Kleikamp if (error) { 299482939d79SJan Kara if (error == -EBUSY) 2995ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 299682939d79SJan Kara } else 2997ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 2998ac27a0ecSDave Kleikamp } 2999ac27a0ecSDave Kleikamp 3000ac27a0ecSDave Kleikamp /* 3001617ba13bSMingming Cao * ext4_xattr_cmp() 3002ac27a0ecSDave Kleikamp * 3003ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 3004ac27a0ecSDave Kleikamp * 3005ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 3006ac27a0ecSDave Kleikamp * a negative error number on errors. 3007ac27a0ecSDave Kleikamp */ 3008ac27a0ecSDave Kleikamp static int 3009617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 3010617ba13bSMingming Cao struct ext4_xattr_header *header2) 3011ac27a0ecSDave Kleikamp { 3012617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 3013ac27a0ecSDave Kleikamp 3014ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 3015ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 3016ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 3017ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 3018ac27a0ecSDave Kleikamp return 1; 3019ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 3020ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 3021ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 3022ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 3023e50e5129SAndreas Dilger entry1->e_value_inum != entry2->e_value_inum || 3024ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 3025ac27a0ecSDave Kleikamp return 1; 30267cec1918STahsin Erdogan if (!entry1->e_value_inum && 30277cec1918STahsin Erdogan memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 3028ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 3029ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 3030ac27a0ecSDave Kleikamp return 1; 3031ac27a0ecSDave Kleikamp 3032617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 3033617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 3034ac27a0ecSDave Kleikamp } 3035ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 3036ac27a0ecSDave Kleikamp return 1; 3037ac27a0ecSDave Kleikamp return 0; 3038ac27a0ecSDave Kleikamp } 3039ac27a0ecSDave Kleikamp 3040ac27a0ecSDave Kleikamp /* 304147387409STahsin Erdogan * ext4_xattr_block_cache_find() 3042ac27a0ecSDave Kleikamp * 3043ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 3044ac27a0ecSDave Kleikamp * 3045ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 3046ac27a0ecSDave Kleikamp * not found or an error occurred. 3047ac27a0ecSDave Kleikamp */ 3048ac27a0ecSDave Kleikamp static struct buffer_head * 304947387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *inode, 305047387409STahsin Erdogan struct ext4_xattr_header *header, 30517a2508e1SJan Kara struct mb_cache_entry **pce) 3052ac27a0ecSDave Kleikamp { 3053ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 30547a2508e1SJan Kara struct mb_cache_entry *ce; 305547387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 3056ac27a0ecSDave Kleikamp 3057cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 3058cdb7ee4cSTahsin Erdogan return NULL; 3059ac27a0ecSDave Kleikamp if (!header->h_hash) 3060ac27a0ecSDave Kleikamp return NULL; /* never share */ 3061ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 306247387409STahsin Erdogan ce = mb_cache_entry_find_first(ea_block_cache, hash); 3063ac27a0ecSDave Kleikamp while (ce) { 3064ac27a0ecSDave Kleikamp struct buffer_head *bh; 3065ac27a0ecSDave Kleikamp 3066fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, ce->e_value, REQ_PRIO); 3067fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 3068fb265c9cSTheodore Ts'o if (PTR_ERR(bh) == -ENOMEM) 3069fb265c9cSTheodore Ts'o return NULL; 30707159a986SDan Carpenter bh = NULL; 307124676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 3072c07dfcb4STahsin Erdogan (unsigned long)ce->e_value); 3073617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 3074ac27a0ecSDave Kleikamp *pce = ce; 3075ac27a0ecSDave Kleikamp return bh; 3076ac27a0ecSDave Kleikamp } 3077ac27a0ecSDave Kleikamp brelse(bh); 307847387409STahsin Erdogan ce = mb_cache_entry_find_next(ea_block_cache, ce); 3079ac27a0ecSDave Kleikamp } 3080ac27a0ecSDave Kleikamp return NULL; 3081ac27a0ecSDave Kleikamp } 3082ac27a0ecSDave Kleikamp 3083ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 3084ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 3085ac27a0ecSDave Kleikamp 3086ac27a0ecSDave Kleikamp /* 3087617ba13bSMingming Cao * ext4_xattr_hash_entry() 3088ac27a0ecSDave Kleikamp * 3089ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 3090ac27a0ecSDave Kleikamp */ 3091b9fc761eSTahsin Erdogan static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, 3092b9fc761eSTahsin Erdogan size_t value_count) 3093ac27a0ecSDave Kleikamp { 3094ac27a0ecSDave Kleikamp __u32 hash = 0; 3095ac27a0ecSDave Kleikamp 3096b9fc761eSTahsin Erdogan while (name_len--) { 3097ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 3098ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 3099ac27a0ecSDave Kleikamp *name++; 3100ac27a0ecSDave Kleikamp } 3101b9fc761eSTahsin Erdogan while (value_count--) { 3102ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 3103ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 3104ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 3105ac27a0ecSDave Kleikamp } 3106b9fc761eSTahsin Erdogan return cpu_to_le32(hash); 3107ac27a0ecSDave Kleikamp } 3108ac27a0ecSDave Kleikamp 3109*f3bbac32SLinus Torvalds /* 3110*f3bbac32SLinus Torvalds * ext4_xattr_hash_entry_signed() 3111*f3bbac32SLinus Torvalds * 3112*f3bbac32SLinus Torvalds * Compute the hash of an extended attribute incorrectly. 3113*f3bbac32SLinus Torvalds */ 3114*f3bbac32SLinus Torvalds static __le32 ext4_xattr_hash_entry_signed(char *name, size_t name_len, __le32 *value, size_t value_count) 3115*f3bbac32SLinus Torvalds { 3116*f3bbac32SLinus Torvalds __u32 hash = 0; 3117*f3bbac32SLinus Torvalds 3118*f3bbac32SLinus Torvalds while (name_len--) { 3119*f3bbac32SLinus Torvalds hash = (hash << NAME_HASH_SHIFT) ^ 3120*f3bbac32SLinus Torvalds (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 3121*f3bbac32SLinus Torvalds (signed char)*name++; 3122*f3bbac32SLinus Torvalds } 3123*f3bbac32SLinus Torvalds while (value_count--) { 3124*f3bbac32SLinus Torvalds hash = (hash << VALUE_HASH_SHIFT) ^ 3125*f3bbac32SLinus Torvalds (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 3126*f3bbac32SLinus Torvalds le32_to_cpu(*value++); 3127*f3bbac32SLinus Torvalds } 3128*f3bbac32SLinus Torvalds return cpu_to_le32(hash); 3129*f3bbac32SLinus Torvalds } 3130*f3bbac32SLinus Torvalds 3131ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 3132ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 3133ac27a0ecSDave Kleikamp 3134ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 3135ac27a0ecSDave Kleikamp 3136ac27a0ecSDave Kleikamp /* 3137617ba13bSMingming Cao * ext4_xattr_rehash() 3138ac27a0ecSDave Kleikamp * 3139ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 3140ac27a0ecSDave Kleikamp */ 3141daf83281STahsin Erdogan static void ext4_xattr_rehash(struct ext4_xattr_header *header) 3142ac27a0ecSDave Kleikamp { 3143617ba13bSMingming Cao struct ext4_xattr_entry *here; 3144ac27a0ecSDave Kleikamp __u32 hash = 0; 3145ac27a0ecSDave Kleikamp 3146ac27a0ecSDave Kleikamp here = ENTRY(header+1); 3147ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 3148ac27a0ecSDave Kleikamp if (!here->e_hash) { 3149ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 3150ac27a0ecSDave Kleikamp hash = 0; 3151ac27a0ecSDave Kleikamp break; 3152ac27a0ecSDave Kleikamp } 3153ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 3154ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 3155ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 3156617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 3157ac27a0ecSDave Kleikamp } 3158ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 3159ac27a0ecSDave Kleikamp } 3160ac27a0ecSDave Kleikamp 3161ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 3162ac27a0ecSDave Kleikamp 31639c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 31649c191f70ST Makphaibulchoke 31657a2508e1SJan Kara struct mb_cache * 316682939d79SJan Kara ext4_xattr_create_cache(void) 3167ac27a0ecSDave Kleikamp { 31687a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 3169ac27a0ecSDave Kleikamp } 3170ac27a0ecSDave Kleikamp 31717a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 3172ac27a0ecSDave Kleikamp { 31739c191f70ST Makphaibulchoke if (cache) 31747a2508e1SJan Kara mb_cache_destroy(cache); 3175ac27a0ecSDave Kleikamp } 31769c191f70ST Makphaibulchoke 3177