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); 84f3bbac32SLinus Torvalds static __le32 ext4_xattr_hash_entry_signed(char *name, size_t name_len, __le32 *value, 85f3bbac32SLinus 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 1873478c83cSTheodore Ts'o check_xattrs(struct inode *inode, struct buffer_head *bh, 1883478c83cSTheodore Ts'o struct ext4_xattr_entry *entry, void *end, void *value_start, 1893478c83cSTheodore Ts'o const char *function, unsigned int line) 190ac27a0ecSDave Kleikamp { 191a0626e75SDarrick J. Wong struct ext4_xattr_entry *e = entry; 1923478c83cSTheodore Ts'o int err = -EFSCORRUPTED; 1933478c83cSTheodore Ts'o char *err_str; 1943478c83cSTheodore Ts'o 1953478c83cSTheodore Ts'o if (bh) { 1963478c83cSTheodore Ts'o if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 1973478c83cSTheodore Ts'o BHDR(bh)->h_blocks != cpu_to_le32(1)) { 1983478c83cSTheodore Ts'o err_str = "invalid header"; 1993478c83cSTheodore Ts'o goto errout; 2003478c83cSTheodore Ts'o } 2013478c83cSTheodore Ts'o if (buffer_verified(bh)) 2023478c83cSTheodore Ts'o return 0; 2033478c83cSTheodore Ts'o if (!ext4_xattr_block_csum_verify(inode, bh)) { 2043478c83cSTheodore Ts'o err = -EFSBADCRC; 2053478c83cSTheodore Ts'o err_str = "invalid checksum"; 2063478c83cSTheodore Ts'o goto errout; 2073478c83cSTheodore Ts'o } 2083478c83cSTheodore Ts'o } else { 2093478c83cSTheodore Ts'o struct ext4_xattr_ibody_header *header = value_start; 2103478c83cSTheodore Ts'o 2113478c83cSTheodore Ts'o header -= 1; 2123478c83cSTheodore Ts'o if (end - (void *)header < sizeof(*header) + sizeof(u32)) { 2133478c83cSTheodore Ts'o err_str = "in-inode xattr block too small"; 2143478c83cSTheodore Ts'o goto errout; 2153478c83cSTheodore Ts'o } 2163478c83cSTheodore Ts'o if (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC)) { 2173478c83cSTheodore Ts'o err_str = "bad magic number in in-inode xattr"; 2183478c83cSTheodore Ts'o goto errout; 2193478c83cSTheodore Ts'o } 2203478c83cSTheodore Ts'o } 221a0626e75SDarrick J. Wong 222d7614cc1SEric Biggers /* Find the end of the names list */ 223a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(e)) { 224a0626e75SDarrick J. Wong struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); 2253478c83cSTheodore Ts'o if ((void *)next >= end) { 2263478c83cSTheodore Ts'o err_str = "e_name out of bounds"; 2273478c83cSTheodore Ts'o goto errout; 2283478c83cSTheodore Ts'o } 2293478c83cSTheodore Ts'o if (strnlen(e->e_name, e->e_name_len) != e->e_name_len) { 2303478c83cSTheodore Ts'o err_str = "bad e_name length"; 2313478c83cSTheodore Ts'o goto errout; 2323478c83cSTheodore Ts'o } 233a0626e75SDarrick J. Wong e = next; 234ac27a0ecSDave Kleikamp } 235a0626e75SDarrick J. Wong 236d7614cc1SEric Biggers /* Check the values */ 237a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(entry)) { 238d7614cc1SEric Biggers u32 size = le32_to_cpu(entry->e_value_size); 2393478c83cSTheodore Ts'o unsigned long ea_ino = le32_to_cpu(entry->e_value_inum); 240ce3fd194SEric Biggers 2413478c83cSTheodore Ts'o if (!ext4_has_feature_ea_inode(inode->i_sb) && ea_ino) { 2423478c83cSTheodore Ts'o err_str = "ea_inode specified without ea_inode feature enabled"; 2433478c83cSTheodore Ts'o goto errout; 2443478c83cSTheodore Ts'o } 2453478c83cSTheodore Ts'o if (ea_ino && ((ea_ino == EXT4_ROOT_INO) || 2463478c83cSTheodore Ts'o !ext4_valid_inum(inode->i_sb, ea_ino))) { 2473478c83cSTheodore Ts'o err_str = "invalid ea_ino"; 2483478c83cSTheodore Ts'o goto errout; 2493478c83cSTheodore Ts'o } 2503478c83cSTheodore Ts'o if (size > EXT4_XATTR_SIZE_MAX) { 2513478c83cSTheodore Ts'o err_str = "e_value size too large"; 2523478c83cSTheodore Ts'o goto errout; 2533478c83cSTheodore Ts'o } 254ce3fd194SEric Biggers 255ce3fd194SEric Biggers if (size != 0 && entry->e_value_inum == 0) { 256ce3fd194SEric Biggers u16 offs = le16_to_cpu(entry->e_value_offs); 257d7614cc1SEric Biggers void *value; 258d7614cc1SEric Biggers 259d7614cc1SEric Biggers /* 260d7614cc1SEric Biggers * The value cannot overlap the names, and the value 261d7614cc1SEric Biggers * with padding cannot extend beyond 'end'. Check both 262d7614cc1SEric Biggers * the padded and unpadded sizes, since the size may 263d7614cc1SEric Biggers * overflow to 0 when adding padding. 264d7614cc1SEric Biggers */ 2653478c83cSTheodore Ts'o if (offs > end - value_start) { 2663478c83cSTheodore Ts'o err_str = "e_value out of bounds"; 2673478c83cSTheodore Ts'o goto errout; 2683478c83cSTheodore Ts'o } 269d7614cc1SEric Biggers value = value_start + offs; 270d7614cc1SEric Biggers if (value < (void *)e + sizeof(u32) || 271d7614cc1SEric Biggers size > end - value || 2723478c83cSTheodore Ts'o EXT4_XATTR_SIZE(size) > end - value) { 2733478c83cSTheodore Ts'o err_str = "overlapping e_value "; 2743478c83cSTheodore Ts'o goto errout; 2753478c83cSTheodore Ts'o } 276d7614cc1SEric Biggers } 277a0626e75SDarrick J. Wong entry = EXT4_XATTR_NEXT(entry); 278a0626e75SDarrick J. Wong } 2793478c83cSTheodore Ts'o if (bh) 2803478c83cSTheodore Ts'o set_buffer_verified(bh); 281ac27a0ecSDave Kleikamp return 0; 2823478c83cSTheodore Ts'o 2833478c83cSTheodore Ts'o errout: 2843478c83cSTheodore Ts'o if (bh) 2853478c83cSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, -err, 2863478c83cSTheodore Ts'o "corrupted xattr block %llu: %s", 2873478c83cSTheodore Ts'o (unsigned long long) bh->b_blocknr, 2883478c83cSTheodore Ts'o err_str); 2893478c83cSTheodore Ts'o else 2903478c83cSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, -err, 2913478c83cSTheodore Ts'o "corrupted in-inode xattr: %s", err_str); 2923478c83cSTheodore Ts'o return err; 293ac27a0ecSDave Kleikamp } 294ac27a0ecSDave Kleikamp 295ac27a0ecSDave Kleikamp static inline int 296de05ca85STheodore Ts'o __ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh, 297de05ca85STheodore Ts'o const char *function, unsigned int line) 298ac27a0ecSDave Kleikamp { 2993478c83cSTheodore Ts'o return check_xattrs(inode, bh, BFIRST(bh), bh->b_data + bh->b_size, 3003478c83cSTheodore Ts'o bh->b_data, function, line); 301ac27a0ecSDave Kleikamp } 302ac27a0ecSDave Kleikamp 303de05ca85STheodore Ts'o #define ext4_xattr_check_block(inode, bh) \ 304de05ca85STheodore Ts'o __ext4_xattr_check_block((inode), (bh), __func__, __LINE__) 305de05ca85STheodore Ts'o 306de05ca85STheodore Ts'o 3073478c83cSTheodore Ts'o static inline int 3089e92f48cSTheodore Ts'o __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, 3099e92f48cSTheodore Ts'o void *end, const char *function, unsigned int line) 3109e92f48cSTheodore Ts'o { 3113478c83cSTheodore Ts'o return check_xattrs(inode, NULL, IFIRST(header), end, IFIRST(header), 3123478c83cSTheodore Ts'o function, line); 3139e92f48cSTheodore Ts'o } 3149e92f48cSTheodore Ts'o 3159e92f48cSTheodore Ts'o #define xattr_check_inode(inode, header, end) \ 3169e92f48cSTheodore Ts'o __xattr_check_inode((inode), (header), (end), __func__, __LINE__) 3179e92f48cSTheodore Ts'o 318ac27a0ecSDave Kleikamp static int 3199496005dSTheodore Ts'o xattr_find_entry(struct inode *inode, struct ext4_xattr_entry **pentry, 3209496005dSTheodore Ts'o void *end, int name_index, const char *name, int sorted) 321ac27a0ecSDave Kleikamp { 3229496005dSTheodore Ts'o struct ext4_xattr_entry *entry, *next; 323ac27a0ecSDave Kleikamp size_t name_len; 324ac27a0ecSDave Kleikamp int cmp = 1; 325ac27a0ecSDave Kleikamp 326ac27a0ecSDave Kleikamp if (name == NULL) 327ac27a0ecSDave Kleikamp return -EINVAL; 328ac27a0ecSDave Kleikamp name_len = strlen(name); 3299496005dSTheodore Ts'o for (entry = *pentry; !IS_LAST_ENTRY(entry); entry = next) { 3309496005dSTheodore Ts'o next = EXT4_XATTR_NEXT(entry); 3319496005dSTheodore Ts'o if ((void *) next >= end) { 3329496005dSTheodore Ts'o EXT4_ERROR_INODE(inode, "corrupted xattr entries"); 3339496005dSTheodore Ts'o return -EFSCORRUPTED; 3349496005dSTheodore Ts'o } 335ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 336ac27a0ecSDave Kleikamp if (!cmp) 337ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 338ac27a0ecSDave Kleikamp if (!cmp) 339ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 340ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 341ac27a0ecSDave Kleikamp break; 342ac27a0ecSDave Kleikamp } 343ac27a0ecSDave Kleikamp *pentry = entry; 344ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 345ac27a0ecSDave Kleikamp } 346ac27a0ecSDave Kleikamp 347dec214d0STahsin Erdogan static u32 348dec214d0STahsin Erdogan ext4_xattr_inode_hash(struct ext4_sb_info *sbi, const void *buffer, size_t size) 349dec214d0STahsin Erdogan { 350dec214d0STahsin Erdogan return ext4_chksum(sbi, sbi->s_csum_seed, buffer, size); 351dec214d0STahsin Erdogan } 352dec214d0STahsin Erdogan 353dec214d0STahsin Erdogan static u64 ext4_xattr_inode_get_ref(struct inode *ea_inode) 354dec214d0STahsin Erdogan { 355dec214d0STahsin Erdogan return ((u64)ea_inode->i_ctime.tv_sec << 32) | 356ee73f9a5SJeff Layton (u32) inode_peek_iversion_raw(ea_inode); 357dec214d0STahsin Erdogan } 358dec214d0STahsin Erdogan 359dec214d0STahsin Erdogan static void ext4_xattr_inode_set_ref(struct inode *ea_inode, u64 ref_count) 360dec214d0STahsin Erdogan { 361dec214d0STahsin Erdogan ea_inode->i_ctime.tv_sec = (u32)(ref_count >> 32); 362ee73f9a5SJeff Layton inode_set_iversion_raw(ea_inode, ref_count & 0xffffffff); 363dec214d0STahsin Erdogan } 364dec214d0STahsin Erdogan 365dec214d0STahsin Erdogan static u32 ext4_xattr_inode_get_hash(struct inode *ea_inode) 366dec214d0STahsin Erdogan { 367dec214d0STahsin Erdogan return (u32)ea_inode->i_atime.tv_sec; 368dec214d0STahsin Erdogan } 369dec214d0STahsin Erdogan 370dec214d0STahsin Erdogan static void ext4_xattr_inode_set_hash(struct inode *ea_inode, u32 hash) 371dec214d0STahsin Erdogan { 372dec214d0STahsin Erdogan ea_inode->i_atime.tv_sec = hash; 373dec214d0STahsin Erdogan } 374dec214d0STahsin Erdogan 375e50e5129SAndreas Dilger /* 376e50e5129SAndreas Dilger * Read the EA value from an inode. 377e50e5129SAndreas Dilger */ 37890966693STahsin Erdogan static int ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t size) 379e50e5129SAndreas Dilger { 3809699d4f9STahsin Erdogan int blocksize = 1 << ea_inode->i_blkbits; 3819699d4f9STahsin Erdogan int bh_count = (size + blocksize - 1) >> ea_inode->i_blkbits; 3829699d4f9STahsin Erdogan int tail_size = (size % blocksize) ?: blocksize; 3839699d4f9STahsin Erdogan struct buffer_head *bhs_inline[8]; 3849699d4f9STahsin Erdogan struct buffer_head **bhs = bhs_inline; 3859699d4f9STahsin Erdogan int i, ret; 386e50e5129SAndreas Dilger 3879699d4f9STahsin Erdogan if (bh_count > ARRAY_SIZE(bhs_inline)) { 3889699d4f9STahsin Erdogan bhs = kmalloc_array(bh_count, sizeof(*bhs), GFP_NOFS); 3899699d4f9STahsin Erdogan if (!bhs) 3909699d4f9STahsin Erdogan return -ENOMEM; 391e50e5129SAndreas Dilger } 3929699d4f9STahsin Erdogan 3939699d4f9STahsin Erdogan ret = ext4_bread_batch(ea_inode, 0 /* block */, bh_count, 3949699d4f9STahsin Erdogan true /* wait */, bhs); 3959699d4f9STahsin Erdogan if (ret) 3969699d4f9STahsin Erdogan goto free_bhs; 3979699d4f9STahsin Erdogan 3989699d4f9STahsin Erdogan for (i = 0; i < bh_count; i++) { 3999699d4f9STahsin Erdogan /* There shouldn't be any holes in ea_inode. */ 4009699d4f9STahsin Erdogan if (!bhs[i]) { 4019699d4f9STahsin Erdogan ret = -EFSCORRUPTED; 4029699d4f9STahsin Erdogan goto put_bhs; 4039699d4f9STahsin Erdogan } 4049699d4f9STahsin Erdogan memcpy((char *)buf + blocksize * i, bhs[i]->b_data, 4059699d4f9STahsin Erdogan i < bh_count - 1 ? blocksize : tail_size); 4069699d4f9STahsin Erdogan } 4079699d4f9STahsin Erdogan ret = 0; 4089699d4f9STahsin Erdogan put_bhs: 4099699d4f9STahsin Erdogan for (i = 0; i < bh_count; i++) 4109699d4f9STahsin Erdogan brelse(bhs[i]); 4119699d4f9STahsin Erdogan free_bhs: 4129699d4f9STahsin Erdogan if (bhs != bhs_inline) 4139699d4f9STahsin Erdogan kfree(bhs); 4149699d4f9STahsin Erdogan return ret; 415e50e5129SAndreas Dilger } 416e50e5129SAndreas Dilger 417a6d05676STahsin Erdogan #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec) 418a6d05676STahsin Erdogan 419bab79b04STahsin Erdogan static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, 420a6d05676STahsin Erdogan u32 ea_inode_hash, struct inode **ea_inode) 421e50e5129SAndreas Dilger { 422bab79b04STahsin Erdogan struct inode *inode; 423bab79b04STahsin Erdogan int err; 424e50e5129SAndreas Dilger 425*0f7bfd6fSBaokun Li /* 426*0f7bfd6fSBaokun Li * We have to check for this corruption early as otherwise 427*0f7bfd6fSBaokun Li * iget_locked() could wait indefinitely for the state of our 428*0f7bfd6fSBaokun Li * parent inode. 429*0f7bfd6fSBaokun Li */ 430*0f7bfd6fSBaokun Li if (parent->i_ino == ea_ino) { 431*0f7bfd6fSBaokun Li ext4_error(parent->i_sb, 432*0f7bfd6fSBaokun Li "Parent and EA inode have the same ino %lu", ea_ino); 433*0f7bfd6fSBaokun Li return -EFSCORRUPTED; 434*0f7bfd6fSBaokun Li } 435*0f7bfd6fSBaokun Li 4368a363970STheodore Ts'o inode = ext4_iget(parent->i_sb, ea_ino, EXT4_IGET_NORMAL); 437bab79b04STahsin Erdogan if (IS_ERR(inode)) { 438bab79b04STahsin Erdogan err = PTR_ERR(inode); 439dec214d0STahsin Erdogan ext4_error(parent->i_sb, 440dec214d0STahsin Erdogan "error while reading EA inode %lu err=%d", ea_ino, 441dec214d0STahsin Erdogan err); 442bab79b04STahsin Erdogan return err; 443e50e5129SAndreas Dilger } 444e50e5129SAndreas Dilger 445bab79b04STahsin Erdogan if (is_bad_inode(inode)) { 446dec214d0STahsin Erdogan ext4_error(parent->i_sb, 447dec214d0STahsin Erdogan "error while reading EA inode %lu is_bad_inode", 448dec214d0STahsin Erdogan ea_ino); 449bab79b04STahsin Erdogan err = -EIO; 450e50e5129SAndreas Dilger goto error; 451e50e5129SAndreas Dilger } 452e50e5129SAndreas Dilger 453bab79b04STahsin Erdogan if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) { 454dec214d0STahsin Erdogan ext4_error(parent->i_sb, 455dec214d0STahsin Erdogan "EA inode %lu does not have EXT4_EA_INODE_FL flag", 456dec214d0STahsin Erdogan ea_ino); 457bab79b04STahsin Erdogan err = -EINVAL; 458e50e5129SAndreas Dilger goto error; 459e50e5129SAndreas Dilger } 460e50e5129SAndreas Dilger 461a6d05676STahsin Erdogan ext4_xattr_inode_set_class(inode); 462a6d05676STahsin Erdogan 463a6d05676STahsin Erdogan /* 464a6d05676STahsin Erdogan * Check whether this is an old Lustre-style xattr inode. Lustre 465a6d05676STahsin Erdogan * implementation does not have hash validation, rather it has a 466a6d05676STahsin Erdogan * backpointer from ea_inode to the parent inode. 467a6d05676STahsin Erdogan */ 468a6d05676STahsin Erdogan if (ea_inode_hash != ext4_xattr_inode_get_hash(inode) && 469a6d05676STahsin Erdogan EXT4_XATTR_INODE_GET_PARENT(inode) == parent->i_ino && 470a6d05676STahsin Erdogan inode->i_generation == parent->i_generation) { 471a6d05676STahsin Erdogan ext4_set_inode_state(inode, EXT4_STATE_LUSTRE_EA_INODE); 472a6d05676STahsin Erdogan ext4_xattr_inode_set_ref(inode, 1); 473a6d05676STahsin Erdogan } else { 474a6d05676STahsin Erdogan inode_lock(inode); 475a6d05676STahsin Erdogan inode->i_flags |= S_NOQUOTA; 476a6d05676STahsin Erdogan inode_unlock(inode); 477a6d05676STahsin Erdogan } 478a6d05676STahsin Erdogan 479bab79b04STahsin Erdogan *ea_inode = inode; 480bab79b04STahsin Erdogan return 0; 481e50e5129SAndreas Dilger error: 482bab79b04STahsin Erdogan iput(inode); 483bab79b04STahsin Erdogan return err; 484e50e5129SAndreas Dilger } 485e50e5129SAndreas Dilger 4866bc0d63dSJan Kara /* Remove entry from mbcache when EA inode is getting evicted */ 4876bc0d63dSJan Kara void ext4_evict_ea_inode(struct inode *inode) 4886bc0d63dSJan Kara { 48965f8b800SJan Kara struct mb_cache_entry *oe; 49065f8b800SJan Kara 49165f8b800SJan Kara if (!EA_INODE_CACHE(inode)) 49265f8b800SJan Kara return; 49365f8b800SJan Kara /* Wait for entry to get unused so that we can remove it */ 49465f8b800SJan Kara while ((oe = mb_cache_entry_delete_or_get(EA_INODE_CACHE(inode), 49565f8b800SJan Kara ext4_xattr_inode_get_hash(inode), inode->i_ino))) { 49665f8b800SJan Kara mb_cache_entry_wait_unused(oe); 49765f8b800SJan Kara mb_cache_entry_put(EA_INODE_CACHE(inode), oe); 49865f8b800SJan Kara } 4996bc0d63dSJan Kara } 5006bc0d63dSJan Kara 501dec214d0STahsin Erdogan static int 502b9fc761eSTahsin Erdogan ext4_xattr_inode_verify_hashes(struct inode *ea_inode, 503b9fc761eSTahsin Erdogan struct ext4_xattr_entry *entry, void *buffer, 504b9fc761eSTahsin Erdogan size_t size) 505dec214d0STahsin Erdogan { 506dec214d0STahsin Erdogan u32 hash; 507dec214d0STahsin Erdogan 508dec214d0STahsin Erdogan /* Verify stored hash matches calculated hash. */ 509dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); 510dec214d0STahsin Erdogan if (hash != ext4_xattr_inode_get_hash(ea_inode)) 511dec214d0STahsin Erdogan return -EFSCORRUPTED; 512b9fc761eSTahsin Erdogan 513b9fc761eSTahsin Erdogan if (entry) { 514b9fc761eSTahsin Erdogan __le32 e_hash, tmp_data; 515b9fc761eSTahsin Erdogan 516b9fc761eSTahsin Erdogan /* Verify entry hash. */ 517b9fc761eSTahsin Erdogan tmp_data = cpu_to_le32(hash); 518b9fc761eSTahsin Erdogan e_hash = ext4_xattr_hash_entry(entry->e_name, entry->e_name_len, 519b9fc761eSTahsin Erdogan &tmp_data, 1); 520f3bbac32SLinus Torvalds /* All good? */ 521f3bbac32SLinus Torvalds if (e_hash == entry->e_hash) 522f3bbac32SLinus Torvalds return 0; 523f3bbac32SLinus Torvalds 524f3bbac32SLinus Torvalds /* 525f3bbac32SLinus Torvalds * Not good. Maybe the entry hash was calculated 526f3bbac32SLinus Torvalds * using the buggy signed char version? 527f3bbac32SLinus Torvalds */ 528f3bbac32SLinus Torvalds e_hash = ext4_xattr_hash_entry_signed(entry->e_name, entry->e_name_len, 529f3bbac32SLinus Torvalds &tmp_data, 1); 530f3bbac32SLinus Torvalds if (e_hash == entry->e_hash) 531f3bbac32SLinus Torvalds return 0; 532f3bbac32SLinus Torvalds 533f3bbac32SLinus Torvalds /* Still no match - bad */ 534b9fc761eSTahsin Erdogan return -EFSCORRUPTED; 535b9fc761eSTahsin Erdogan } 536dec214d0STahsin Erdogan return 0; 537dec214d0STahsin Erdogan } 538dec214d0STahsin Erdogan 539e50e5129SAndreas Dilger /* 540b9fc761eSTahsin Erdogan * Read xattr value from the EA inode. 541e50e5129SAndreas Dilger */ 542e50e5129SAndreas Dilger static int 543b9fc761eSTahsin Erdogan ext4_xattr_inode_get(struct inode *inode, struct ext4_xattr_entry *entry, 544b9fc761eSTahsin Erdogan void *buffer, size_t size) 545e50e5129SAndreas Dilger { 546dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 547bab79b04STahsin Erdogan struct inode *ea_inode; 548dec214d0STahsin Erdogan int err; 549e50e5129SAndreas Dilger 550b9fc761eSTahsin Erdogan err = ext4_xattr_inode_iget(inode, le32_to_cpu(entry->e_value_inum), 551a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), &ea_inode); 552dec214d0STahsin Erdogan if (err) { 553dec214d0STahsin Erdogan ea_inode = NULL; 554dec214d0STahsin Erdogan goto out; 555dec214d0STahsin Erdogan } 556e50e5129SAndreas Dilger 557dec214d0STahsin Erdogan if (i_size_read(ea_inode) != size) { 558dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 559dec214d0STahsin Erdogan "ea_inode file size=%llu entry size=%zu", 560dec214d0STahsin Erdogan i_size_read(ea_inode), size); 561dec214d0STahsin Erdogan err = -EFSCORRUPTED; 562dec214d0STahsin Erdogan goto out; 563dec214d0STahsin Erdogan } 564dec214d0STahsin Erdogan 565dec214d0STahsin Erdogan err = ext4_xattr_inode_read(ea_inode, buffer, size); 566dec214d0STahsin Erdogan if (err) 567dec214d0STahsin Erdogan goto out; 568dec214d0STahsin Erdogan 569a6d05676STahsin Erdogan if (!ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) { 570a6d05676STahsin Erdogan err = ext4_xattr_inode_verify_hashes(ea_inode, entry, buffer, 571a6d05676STahsin Erdogan size); 572a6d05676STahsin Erdogan if (err) { 573dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 574dec214d0STahsin Erdogan "EA inode hash validation failed"); 575dec214d0STahsin Erdogan goto out; 576dec214d0STahsin Erdogan } 577dec214d0STahsin Erdogan 578dec214d0STahsin Erdogan if (ea_inode_cache) 579dec214d0STahsin Erdogan mb_cache_entry_create(ea_inode_cache, GFP_NOFS, 580dec214d0STahsin Erdogan ext4_xattr_inode_get_hash(ea_inode), 581dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 582a6d05676STahsin Erdogan } 583dec214d0STahsin Erdogan out: 584e50e5129SAndreas Dilger iput(ea_inode); 585dec214d0STahsin Erdogan return err; 586e50e5129SAndreas Dilger } 587e50e5129SAndreas Dilger 588ac27a0ecSDave Kleikamp static int 589617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 590ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 591ac27a0ecSDave Kleikamp { 592ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 593617ba13bSMingming Cao struct ext4_xattr_entry *entry; 594ac27a0ecSDave Kleikamp size_t size; 5959496005dSTheodore Ts'o void *end; 596ac27a0ecSDave Kleikamp int error; 59747387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 598ac27a0ecSDave Kleikamp 599ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 600ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 601ac27a0ecSDave Kleikamp 602617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 603fb265c9cSTheodore Ts'o return -ENODATA; 604ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 605ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 606fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 607fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 608fb265c9cSTheodore Ts'o return PTR_ERR(bh); 609ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 610ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 611de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 612de05ca85STheodore Ts'o if (error) 613ac27a0ecSDave Kleikamp goto cleanup; 61447387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bh); 615ac27a0ecSDave Kleikamp entry = BFIRST(bh); 6169496005dSTheodore Ts'o end = bh->b_data + bh->b_size; 6179496005dSTheodore Ts'o error = xattr_find_entry(inode, &entry, end, name_index, name, 1); 618ac27a0ecSDave Kleikamp if (error) 619ac27a0ecSDave Kleikamp goto cleanup; 620ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 621ac27a0ecSDave Kleikamp error = -ERANGE; 62254dd0e0aSTheodore Ts'o if (unlikely(size > EXT4_XATTR_SIZE_MAX)) 62354dd0e0aSTheodore Ts'o goto cleanup; 62454dd0e0aSTheodore Ts'o if (buffer) { 625ac27a0ecSDave Kleikamp if (size > buffer_size) 626ac27a0ecSDave Kleikamp goto cleanup; 627e50e5129SAndreas Dilger if (entry->e_value_inum) { 628b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 629b9fc761eSTahsin Erdogan size); 630e50e5129SAndreas Dilger if (error) 631e50e5129SAndreas Dilger goto cleanup; 632e50e5129SAndreas Dilger } else { 63354dd0e0aSTheodore Ts'o u16 offset = le16_to_cpu(entry->e_value_offs); 63454dd0e0aSTheodore Ts'o void *p = bh->b_data + offset; 63554dd0e0aSTheodore Ts'o 63654dd0e0aSTheodore Ts'o if (unlikely(p + size > end)) 63754dd0e0aSTheodore Ts'o goto cleanup; 63854dd0e0aSTheodore Ts'o memcpy(buffer, p, size); 639e50e5129SAndreas Dilger } 640ac27a0ecSDave Kleikamp } 641ac27a0ecSDave Kleikamp error = size; 642ac27a0ecSDave Kleikamp 643ac27a0ecSDave Kleikamp cleanup: 644ac27a0ecSDave Kleikamp brelse(bh); 645ac27a0ecSDave Kleikamp return error; 646ac27a0ecSDave Kleikamp } 647ac27a0ecSDave Kleikamp 648879b3825STao Ma int 649617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 650ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 651ac27a0ecSDave Kleikamp { 652617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 653617ba13bSMingming Cao struct ext4_xattr_entry *entry; 654617ba13bSMingming Cao struct ext4_inode *raw_inode; 655617ba13bSMingming Cao struct ext4_iloc iloc; 656ac27a0ecSDave Kleikamp size_t size; 657ac27a0ecSDave Kleikamp void *end; 658ac27a0ecSDave Kleikamp int error; 659ac27a0ecSDave Kleikamp 66019f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 661ac27a0ecSDave Kleikamp return -ENODATA; 662617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 663ac27a0ecSDave Kleikamp if (error) 664ac27a0ecSDave Kleikamp return error; 665617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 666ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 667617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 6689e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 669ac27a0ecSDave Kleikamp if (error) 670ac27a0ecSDave Kleikamp goto cleanup; 6716ba644b9SEric Biggers entry = IFIRST(header); 6729496005dSTheodore Ts'o error = xattr_find_entry(inode, &entry, end, name_index, name, 0); 673ac27a0ecSDave Kleikamp if (error) 674ac27a0ecSDave Kleikamp goto cleanup; 675ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 676ac27a0ecSDave Kleikamp error = -ERANGE; 67754dd0e0aSTheodore Ts'o if (unlikely(size > EXT4_XATTR_SIZE_MAX)) 67854dd0e0aSTheodore Ts'o goto cleanup; 67954dd0e0aSTheodore Ts'o if (buffer) { 680ac27a0ecSDave Kleikamp if (size > buffer_size) 681ac27a0ecSDave Kleikamp goto cleanup; 682e50e5129SAndreas Dilger if (entry->e_value_inum) { 683b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 684b9fc761eSTahsin Erdogan size); 685e50e5129SAndreas Dilger if (error) 686e50e5129SAndreas Dilger goto cleanup; 687e50e5129SAndreas Dilger } else { 68854dd0e0aSTheodore Ts'o u16 offset = le16_to_cpu(entry->e_value_offs); 68954dd0e0aSTheodore Ts'o void *p = (void *)IFIRST(header) + offset; 69054dd0e0aSTheodore Ts'o 69154dd0e0aSTheodore Ts'o if (unlikely(p + size > end)) 69254dd0e0aSTheodore Ts'o goto cleanup; 69354dd0e0aSTheodore Ts'o memcpy(buffer, p, size); 694ac27a0ecSDave Kleikamp } 695e50e5129SAndreas Dilger } 696ac27a0ecSDave Kleikamp error = size; 697ac27a0ecSDave Kleikamp 698ac27a0ecSDave Kleikamp cleanup: 699ac27a0ecSDave Kleikamp brelse(iloc.bh); 700ac27a0ecSDave Kleikamp return error; 701ac27a0ecSDave Kleikamp } 702ac27a0ecSDave Kleikamp 703ac27a0ecSDave Kleikamp /* 704617ba13bSMingming Cao * ext4_xattr_get() 705ac27a0ecSDave Kleikamp * 706ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 707ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 708ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 709ac27a0ecSDave Kleikamp * 710ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 711ac27a0ecSDave Kleikamp * used / required on success. 712ac27a0ecSDave Kleikamp */ 713ac27a0ecSDave Kleikamp int 714617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 715ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 716ac27a0ecSDave Kleikamp { 717ac27a0ecSDave Kleikamp int error; 718ac27a0ecSDave Kleikamp 7190db1ff22STheodore Ts'o if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 7200db1ff22STheodore Ts'o return -EIO; 7210db1ff22STheodore Ts'o 722230b8c1aSZhang Zhen if (strlen(name) > 255) 723230b8c1aSZhang Zhen return -ERANGE; 724230b8c1aSZhang Zhen 725617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 726617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 727ac27a0ecSDave Kleikamp buffer_size); 728ac27a0ecSDave Kleikamp if (error == -ENODATA) 729617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 730ac27a0ecSDave Kleikamp buffer_size); 731617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 732ac27a0ecSDave Kleikamp return error; 733ac27a0ecSDave Kleikamp } 734ac27a0ecSDave Kleikamp 735ac27a0ecSDave Kleikamp static int 736431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 737ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 738ac27a0ecSDave Kleikamp { 739ac27a0ecSDave Kleikamp size_t rest = buffer_size; 740ac27a0ecSDave Kleikamp 741617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 74211e27528SStephen Hemminger const struct xattr_handler *handler = 743617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 744ac27a0ecSDave Kleikamp 745764a5c6bSAndreas Gruenbacher if (handler && (!handler->list || handler->list(dentry))) { 746764a5c6bSAndreas Gruenbacher const char *prefix = handler->prefix ?: handler->name; 747764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 748764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 749764a5c6bSAndreas Gruenbacher 750ac27a0ecSDave Kleikamp if (buffer) { 751ac27a0ecSDave Kleikamp if (size > rest) 752ac27a0ecSDave Kleikamp return -ERANGE; 753764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 754764a5c6bSAndreas Gruenbacher buffer += prefix_len; 755764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 756764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 757764a5c6bSAndreas Gruenbacher *buffer++ = 0; 758ac27a0ecSDave Kleikamp } 759ac27a0ecSDave Kleikamp rest -= size; 760ac27a0ecSDave Kleikamp } 761ac27a0ecSDave Kleikamp } 762764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 763ac27a0ecSDave Kleikamp } 764ac27a0ecSDave Kleikamp 765ac27a0ecSDave Kleikamp static int 766431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 767ac27a0ecSDave Kleikamp { 7682b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 769ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 770ac27a0ecSDave Kleikamp int error; 771ac27a0ecSDave Kleikamp 772ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 773ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 774ac27a0ecSDave Kleikamp 775617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 776fb265c9cSTheodore Ts'o return 0; 777ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 778ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 779fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 780fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 781fb265c9cSTheodore Ts'o return PTR_ERR(bh); 782ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 783ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 784de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 785de05ca85STheodore Ts'o if (error) 786ac27a0ecSDave Kleikamp goto cleanup; 78747387409STahsin Erdogan ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); 788fb265c9cSTheodore Ts'o error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, 789fb265c9cSTheodore Ts'o buffer_size); 790ac27a0ecSDave Kleikamp cleanup: 791ac27a0ecSDave Kleikamp brelse(bh); 792ac27a0ecSDave Kleikamp return error; 793ac27a0ecSDave Kleikamp } 794ac27a0ecSDave Kleikamp 795ac27a0ecSDave Kleikamp static int 796431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 797ac27a0ecSDave Kleikamp { 7982b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 799617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 800617ba13bSMingming Cao struct ext4_inode *raw_inode; 801617ba13bSMingming Cao struct ext4_iloc iloc; 802ac27a0ecSDave Kleikamp void *end; 803ac27a0ecSDave Kleikamp int error; 804ac27a0ecSDave Kleikamp 80519f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 806ac27a0ecSDave Kleikamp return 0; 807617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 808ac27a0ecSDave Kleikamp if (error) 809ac27a0ecSDave Kleikamp return error; 810617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 811ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 812617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 8139e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 814ac27a0ecSDave Kleikamp if (error) 815ac27a0ecSDave Kleikamp goto cleanup; 816431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 817ac27a0ecSDave Kleikamp buffer, buffer_size); 818ac27a0ecSDave Kleikamp 819ac27a0ecSDave Kleikamp cleanup: 820ac27a0ecSDave Kleikamp brelse(iloc.bh); 821ac27a0ecSDave Kleikamp return error; 822ac27a0ecSDave Kleikamp } 823ac27a0ecSDave Kleikamp 824ac27a0ecSDave Kleikamp /* 825ba7ea1d8SEric Biggers * Inode operation listxattr() 826ba7ea1d8SEric Biggers * 827ba7ea1d8SEric Biggers * d_inode(dentry)->i_rwsem: don't care 828ac27a0ecSDave Kleikamp * 829ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 830ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 831ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 832ac27a0ecSDave Kleikamp * 833ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 834ac27a0ecSDave Kleikamp * used / required on success. 835ac27a0ecSDave Kleikamp */ 836ba7ea1d8SEric Biggers ssize_t 837ba7ea1d8SEric Biggers ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) 838ac27a0ecSDave Kleikamp { 839eaeef867STheodore Ts'o int ret, ret2; 840ac27a0ecSDave Kleikamp 8412b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 842eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 843eaeef867STheodore Ts'o if (ret < 0) 844eaeef867STheodore Ts'o goto errout; 845ac27a0ecSDave Kleikamp if (buffer) { 846eaeef867STheodore Ts'o buffer += ret; 847eaeef867STheodore Ts'o buffer_size -= ret; 848ac27a0ecSDave Kleikamp } 849eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 850eaeef867STheodore Ts'o if (ret < 0) 851eaeef867STheodore Ts'o goto errout; 852eaeef867STheodore Ts'o ret += ret2; 853eaeef867STheodore Ts'o errout: 8542b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 855eaeef867STheodore Ts'o return ret; 856ac27a0ecSDave Kleikamp } 857ac27a0ecSDave Kleikamp 858ac27a0ecSDave Kleikamp /* 859617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 860ac27a0ecSDave Kleikamp * not set, set it. 861ac27a0ecSDave Kleikamp */ 862617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 863ac27a0ecSDave Kleikamp struct super_block *sb) 864ac27a0ecSDave Kleikamp { 865e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 866ac27a0ecSDave Kleikamp return; 867ac27a0ecSDave Kleikamp 8685d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 869188c299eSJan Kara if (ext4_journal_get_write_access(handle, sb, EXT4_SB(sb)->s_sbh, 870188c299eSJan Kara EXT4_JTR_NONE) == 0) { 87105c2c00fSJan Kara lock_buffer(EXT4_SB(sb)->s_sbh); 872e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 87305c2c00fSJan Kara ext4_superblock_csum_set(sb); 87405c2c00fSJan Kara unlock_buffer(EXT4_SB(sb)->s_sbh); 875a3f5cf14SJan Kara ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); 876ac27a0ecSDave Kleikamp } 877ac27a0ecSDave Kleikamp } 878ac27a0ecSDave Kleikamp 8797a9ca53aSTahsin Erdogan int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) 8807a9ca53aSTahsin Erdogan { 8817a9ca53aSTahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 8827a9ca53aSTahsin Erdogan struct buffer_head *bh = NULL; 8837a9ca53aSTahsin Erdogan struct ext4_inode *raw_inode; 8847a9ca53aSTahsin Erdogan struct ext4_xattr_ibody_header *header; 8857a9ca53aSTahsin Erdogan struct ext4_xattr_entry *entry; 8867a9ca53aSTahsin Erdogan qsize_t ea_inode_refs = 0; 8877a9ca53aSTahsin Erdogan void *end; 8887a9ca53aSTahsin Erdogan int ret; 8897a9ca53aSTahsin Erdogan 8907a9ca53aSTahsin Erdogan lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); 8917a9ca53aSTahsin Erdogan 8927a9ca53aSTahsin Erdogan if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 8937a9ca53aSTahsin Erdogan ret = ext4_get_inode_loc(inode, &iloc); 8947a9ca53aSTahsin Erdogan if (ret) 8957a9ca53aSTahsin Erdogan goto out; 8967a9ca53aSTahsin Erdogan raw_inode = ext4_raw_inode(&iloc); 8977a9ca53aSTahsin Erdogan header = IHDR(inode, raw_inode); 8987a9ca53aSTahsin Erdogan end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 8997a9ca53aSTahsin Erdogan ret = xattr_check_inode(inode, header, end); 9007a9ca53aSTahsin Erdogan if (ret) 9017a9ca53aSTahsin Erdogan goto out; 9027a9ca53aSTahsin Erdogan 9037a9ca53aSTahsin Erdogan for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); 9047a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 9057a9ca53aSTahsin Erdogan if (entry->e_value_inum) 9067a9ca53aSTahsin Erdogan ea_inode_refs++; 9077a9ca53aSTahsin Erdogan } 9087a9ca53aSTahsin Erdogan 9097a9ca53aSTahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 910fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 911fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 912fb265c9cSTheodore Ts'o ret = PTR_ERR(bh); 9137159a986SDan Carpenter bh = NULL; 9147a9ca53aSTahsin Erdogan goto out; 9157a9ca53aSTahsin Erdogan } 9167a9ca53aSTahsin Erdogan 917de05ca85STheodore Ts'o ret = ext4_xattr_check_block(inode, bh); 918de05ca85STheodore Ts'o if (ret) 9197a9ca53aSTahsin Erdogan goto out; 9207a9ca53aSTahsin Erdogan 9217a9ca53aSTahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 9227a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 9237a9ca53aSTahsin Erdogan if (entry->e_value_inum) 9247a9ca53aSTahsin Erdogan ea_inode_refs++; 9257a9ca53aSTahsin Erdogan } 9267a9ca53aSTahsin Erdogan *usage = ea_inode_refs + 1; 9277a9ca53aSTahsin Erdogan ret = 0; 9287a9ca53aSTahsin Erdogan out: 9297a9ca53aSTahsin Erdogan brelse(iloc.bh); 9307a9ca53aSTahsin Erdogan brelse(bh); 9317a9ca53aSTahsin Erdogan return ret; 9327a9ca53aSTahsin Erdogan } 9337a9ca53aSTahsin Erdogan 934dec214d0STahsin Erdogan static inline size_t round_up_cluster(struct inode *inode, size_t length) 935dec214d0STahsin Erdogan { 936dec214d0STahsin Erdogan struct super_block *sb = inode->i_sb; 937dec214d0STahsin Erdogan size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + 938dec214d0STahsin Erdogan inode->i_blkbits); 939dec214d0STahsin Erdogan size_t mask = ~(cluster_size - 1); 940dec214d0STahsin Erdogan 941dec214d0STahsin Erdogan return (length + cluster_size - 1) & mask; 942dec214d0STahsin Erdogan } 943dec214d0STahsin Erdogan 944dec214d0STahsin Erdogan static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) 945dec214d0STahsin Erdogan { 946dec214d0STahsin Erdogan int err; 947dec214d0STahsin Erdogan 948dec214d0STahsin Erdogan err = dquot_alloc_inode(inode); 949dec214d0STahsin Erdogan if (err) 950dec214d0STahsin Erdogan return err; 951dec214d0STahsin Erdogan err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); 952dec214d0STahsin Erdogan if (err) 953dec214d0STahsin Erdogan dquot_free_inode(inode); 954dec214d0STahsin Erdogan return err; 955dec214d0STahsin Erdogan } 956dec214d0STahsin Erdogan 957a6d05676STahsin Erdogan static void ext4_xattr_inode_free_quota(struct inode *parent, 958a6d05676STahsin Erdogan struct inode *ea_inode, 959a6d05676STahsin Erdogan size_t len) 960dec214d0STahsin Erdogan { 961a6d05676STahsin Erdogan if (ea_inode && 962a6d05676STahsin Erdogan ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) 963a6d05676STahsin Erdogan return; 964a6d05676STahsin Erdogan dquot_free_space_nodirty(parent, round_up_cluster(parent, len)); 965a6d05676STahsin Erdogan dquot_free_inode(parent); 966dec214d0STahsin Erdogan } 967dec214d0STahsin Erdogan 968af65207cSTahsin Erdogan int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode, 969af65207cSTahsin Erdogan struct buffer_head *block_bh, size_t value_len, 970af65207cSTahsin Erdogan bool is_create) 971dec214d0STahsin Erdogan { 972dec214d0STahsin Erdogan int credits; 973dec214d0STahsin Erdogan int blocks; 974dec214d0STahsin Erdogan 975dec214d0STahsin Erdogan /* 976dec214d0STahsin Erdogan * 1) Owner inode update 977dec214d0STahsin Erdogan * 2) Ref count update on old xattr block 978dec214d0STahsin Erdogan * 3) new xattr block 979dec214d0STahsin Erdogan * 4) block bitmap update for new xattr block 980dec214d0STahsin Erdogan * 5) group descriptor for new xattr block 981dec214d0STahsin Erdogan * 6) block bitmap update for old xattr block 982dec214d0STahsin Erdogan * 7) group descriptor for old block 983dec214d0STahsin Erdogan * 984dec214d0STahsin Erdogan * 6 & 7 can happen if we have two racing threads T_a and T_b 985dec214d0STahsin Erdogan * which are each trying to set an xattr on inodes I_a and I_b 986dec214d0STahsin Erdogan * which were both initially sharing an xattr block. 987dec214d0STahsin Erdogan */ 988dec214d0STahsin Erdogan credits = 7; 989dec214d0STahsin Erdogan 990dec214d0STahsin Erdogan /* Quota updates. */ 991dec214d0STahsin Erdogan credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); 992dec214d0STahsin Erdogan 993dec214d0STahsin Erdogan /* 994dec214d0STahsin Erdogan * In case of inline data, we may push out the data to a block, 995dec214d0STahsin Erdogan * so we need to reserve credits for this eventuality 996dec214d0STahsin Erdogan */ 997af65207cSTahsin Erdogan if (inode && ext4_has_inline_data(inode)) 998dec214d0STahsin Erdogan credits += ext4_writepage_trans_blocks(inode) + 1; 999dec214d0STahsin Erdogan 1000dec214d0STahsin Erdogan /* We are done if ea_inode feature is not enabled. */ 1001dec214d0STahsin Erdogan if (!ext4_has_feature_ea_inode(sb)) 1002dec214d0STahsin Erdogan return credits; 1003dec214d0STahsin Erdogan 1004dec214d0STahsin Erdogan /* New ea_inode, inode map, block bitmap, group descriptor. */ 1005dec214d0STahsin Erdogan credits += 4; 1006dec214d0STahsin Erdogan 1007dec214d0STahsin Erdogan /* Data blocks. */ 1008dec214d0STahsin Erdogan blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 1009dec214d0STahsin Erdogan 1010dec214d0STahsin Erdogan /* Indirection block or one level of extent tree. */ 1011dec214d0STahsin Erdogan blocks += 1; 1012dec214d0STahsin Erdogan 1013dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 1014dec214d0STahsin Erdogan credits += blocks * 2; 1015dec214d0STahsin Erdogan 1016dec214d0STahsin Erdogan /* Blocks themselves. */ 1017dec214d0STahsin Erdogan credits += blocks; 1018dec214d0STahsin Erdogan 1019af65207cSTahsin Erdogan if (!is_create) { 1020dec214d0STahsin Erdogan /* Dereference ea_inode holding old xattr value. 1021dec214d0STahsin Erdogan * Old ea_inode, inode map, block bitmap, group descriptor. 1022dec214d0STahsin Erdogan */ 1023dec214d0STahsin Erdogan credits += 4; 1024dec214d0STahsin Erdogan 1025dec214d0STahsin Erdogan /* Data blocks for old ea_inode. */ 1026dec214d0STahsin Erdogan blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; 1027dec214d0STahsin Erdogan 1028af65207cSTahsin Erdogan /* Indirection block or one level of extent tree for old 1029af65207cSTahsin Erdogan * ea_inode. 1030af65207cSTahsin Erdogan */ 1031dec214d0STahsin Erdogan blocks += 1; 1032dec214d0STahsin Erdogan 1033dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 1034dec214d0STahsin Erdogan credits += blocks * 2; 1035af65207cSTahsin Erdogan } 1036dec214d0STahsin Erdogan 1037dec214d0STahsin Erdogan /* We may need to clone the existing xattr block in which case we need 1038dec214d0STahsin Erdogan * to increment ref counts for existing ea_inodes referenced by it. 1039dec214d0STahsin Erdogan */ 1040dec214d0STahsin Erdogan if (block_bh) { 1041dec214d0STahsin Erdogan struct ext4_xattr_entry *entry = BFIRST(block_bh); 1042dec214d0STahsin Erdogan 1043dec214d0STahsin Erdogan for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) 1044dec214d0STahsin Erdogan if (entry->e_value_inum) 1045dec214d0STahsin Erdogan /* Ref count update on ea_inode. */ 1046dec214d0STahsin Erdogan credits += 1; 1047dec214d0STahsin Erdogan } 1048dec214d0STahsin Erdogan return credits; 1049dec214d0STahsin Erdogan } 1050dec214d0STahsin Erdogan 1051dec214d0STahsin Erdogan static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, 1052dec214d0STahsin Erdogan int ref_change) 1053dec214d0STahsin Erdogan { 1054dec214d0STahsin Erdogan struct ext4_iloc iloc; 1055dec214d0STahsin Erdogan s64 ref_count; 1056dec214d0STahsin Erdogan int ret; 1057dec214d0STahsin Erdogan 1058dec214d0STahsin Erdogan inode_lock(ea_inode); 1059dec214d0STahsin Erdogan 1060dec214d0STahsin Erdogan ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); 10611bfc204dSVasily Averin if (ret) 1062dec214d0STahsin Erdogan goto out; 1063dec214d0STahsin Erdogan 1064dec214d0STahsin Erdogan ref_count = ext4_xattr_inode_get_ref(ea_inode); 1065dec214d0STahsin Erdogan ref_count += ref_change; 1066dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, ref_count); 1067dec214d0STahsin Erdogan 1068dec214d0STahsin Erdogan if (ref_change > 0) { 1069dec214d0STahsin Erdogan WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", 1070dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1071dec214d0STahsin Erdogan 1072dec214d0STahsin Erdogan if (ref_count == 1) { 1073dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", 1074dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1075dec214d0STahsin Erdogan 1076dec214d0STahsin Erdogan set_nlink(ea_inode, 1); 1077dec214d0STahsin Erdogan ext4_orphan_del(handle, ea_inode); 1078cdb7ee4cSTahsin Erdogan } 1079dec214d0STahsin Erdogan } else { 1080dec214d0STahsin Erdogan WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", 1081dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1082dec214d0STahsin Erdogan 1083dec214d0STahsin Erdogan if (ref_count == 0) { 1084dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink != 1, 1085dec214d0STahsin Erdogan "EA inode %lu i_nlink=%u", 1086dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1087dec214d0STahsin Erdogan 1088dec214d0STahsin Erdogan clear_nlink(ea_inode); 1089dec214d0STahsin Erdogan ext4_orphan_add(handle, ea_inode); 1090dec214d0STahsin Erdogan } 1091cdb7ee4cSTahsin Erdogan } 1092dec214d0STahsin Erdogan 1093dec214d0STahsin Erdogan ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); 1094dec214d0STahsin Erdogan if (ret) 1095dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 1096dec214d0STahsin Erdogan "ext4_mark_iloc_dirty() failed ret=%d", ret); 1097dec214d0STahsin Erdogan out: 1098dec214d0STahsin Erdogan inode_unlock(ea_inode); 1099dec214d0STahsin Erdogan return ret; 1100dec214d0STahsin Erdogan } 1101dec214d0STahsin Erdogan 1102dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) 1103dec214d0STahsin Erdogan { 1104dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, 1); 1105dec214d0STahsin Erdogan } 1106dec214d0STahsin Erdogan 1107dec214d0STahsin Erdogan static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) 1108dec214d0STahsin Erdogan { 1109dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, -1); 1110dec214d0STahsin Erdogan } 1111dec214d0STahsin Erdogan 1112dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, 1113dec214d0STahsin Erdogan struct ext4_xattr_entry *first) 1114dec214d0STahsin Erdogan { 1115dec214d0STahsin Erdogan struct inode *ea_inode; 1116dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 1117dec214d0STahsin Erdogan struct ext4_xattr_entry *failed_entry; 1118dec214d0STahsin Erdogan unsigned int ea_ino; 1119dec214d0STahsin Erdogan int err, saved_err; 1120dec214d0STahsin Erdogan 1121dec214d0STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 1122dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1123dec214d0STahsin Erdogan if (!entry->e_value_inum) 1124dec214d0STahsin Erdogan continue; 1125dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1126a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1127a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1128a6d05676STahsin Erdogan &ea_inode); 1129dec214d0STahsin Erdogan if (err) 1130dec214d0STahsin Erdogan goto cleanup; 1131dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1132dec214d0STahsin Erdogan if (err) { 1133dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "inc ref error %d", err); 1134dec214d0STahsin Erdogan iput(ea_inode); 1135dec214d0STahsin Erdogan goto cleanup; 1136dec214d0STahsin Erdogan } 1137dec214d0STahsin Erdogan iput(ea_inode); 1138dec214d0STahsin Erdogan } 1139dec214d0STahsin Erdogan return 0; 1140dec214d0STahsin Erdogan 1141dec214d0STahsin Erdogan cleanup: 1142dec214d0STahsin Erdogan saved_err = err; 1143dec214d0STahsin Erdogan failed_entry = entry; 1144dec214d0STahsin Erdogan 1145dec214d0STahsin Erdogan for (entry = first; entry != failed_entry; 1146dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1147dec214d0STahsin Erdogan if (!entry->e_value_inum) 1148dec214d0STahsin Erdogan continue; 1149dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1150a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1151a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1152a6d05676STahsin Erdogan &ea_inode); 1153dec214d0STahsin Erdogan if (err) { 1154dec214d0STahsin Erdogan ext4_warning(parent->i_sb, 1155dec214d0STahsin Erdogan "cleanup ea_ino %u iget error %d", ea_ino, 1156dec214d0STahsin Erdogan err); 1157dec214d0STahsin Erdogan continue; 1158dec214d0STahsin Erdogan } 1159dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1160dec214d0STahsin Erdogan if (err) 1161dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "cleanup dec ref error %d", 1162dec214d0STahsin Erdogan err); 1163dec214d0STahsin Erdogan iput(ea_inode); 1164dec214d0STahsin Erdogan } 1165dec214d0STahsin Erdogan return saved_err; 1166dec214d0STahsin Erdogan } 1167dec214d0STahsin Erdogan 1168a4130367SJan Kara static int ext4_xattr_restart_fn(handle_t *handle, struct inode *inode, 1169a4130367SJan Kara struct buffer_head *bh, bool block_csum, bool dirty) 1170a4130367SJan Kara { 1171a4130367SJan Kara int error; 1172a4130367SJan Kara 1173a4130367SJan Kara if (bh && dirty) { 1174a4130367SJan Kara if (block_csum) 1175a4130367SJan Kara ext4_xattr_block_csum_set(inode, bh); 1176a4130367SJan Kara error = ext4_handle_dirty_metadata(handle, NULL, bh); 1177a4130367SJan Kara if (error) { 1178a4130367SJan Kara ext4_warning(inode->i_sb, "Handle metadata (error %d)", 1179a4130367SJan Kara error); 1180a4130367SJan Kara return error; 1181a4130367SJan Kara } 1182a4130367SJan Kara } 1183a4130367SJan Kara return 0; 1184a4130367SJan Kara } 1185a4130367SJan Kara 118630a7eb97STahsin Erdogan static void 1187dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, 118830a7eb97STahsin Erdogan struct buffer_head *bh, 118930a7eb97STahsin Erdogan struct ext4_xattr_entry *first, bool block_csum, 119030a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1191dec214d0STahsin Erdogan int extra_credits, bool skip_quota) 119230a7eb97STahsin Erdogan { 119330a7eb97STahsin Erdogan struct inode *ea_inode; 119430a7eb97STahsin Erdogan struct ext4_xattr_entry *entry; 119530a7eb97STahsin Erdogan bool dirty = false; 119630a7eb97STahsin Erdogan unsigned int ea_ino; 119730a7eb97STahsin Erdogan int err; 119830a7eb97STahsin Erdogan int credits; 119930a7eb97STahsin Erdogan 120030a7eb97STahsin Erdogan /* One credit for dec ref on ea_inode, one for orphan list addition, */ 120130a7eb97STahsin Erdogan credits = 2 + extra_credits; 120230a7eb97STahsin Erdogan 120330a7eb97STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 120430a7eb97STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 120530a7eb97STahsin Erdogan if (!entry->e_value_inum) 120630a7eb97STahsin Erdogan continue; 120730a7eb97STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1208a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1209a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1210a6d05676STahsin Erdogan &ea_inode); 121130a7eb97STahsin Erdogan if (err) 121230a7eb97STahsin Erdogan continue; 121330a7eb97STahsin Erdogan 121430a7eb97STahsin Erdogan err = ext4_expand_inode_array(ea_inode_array, ea_inode); 121530a7eb97STahsin Erdogan if (err) { 121630a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, 121730a7eb97STahsin Erdogan "Expand inode array err=%d", err); 121830a7eb97STahsin Erdogan iput(ea_inode); 121930a7eb97STahsin Erdogan continue; 122030a7eb97STahsin Erdogan } 122130a7eb97STahsin Erdogan 1222a4130367SJan Kara err = ext4_journal_ensure_credits_fn(handle, credits, credits, 122383448bdfSJan Kara ext4_free_metadata_revoke_credits(parent->i_sb, 1), 1224a4130367SJan Kara ext4_xattr_restart_fn(handle, parent, bh, block_csum, 1225a4130367SJan Kara dirty)); 1226a4130367SJan Kara if (err < 0) { 122730a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, "Ensure credits err=%d", 122830a7eb97STahsin Erdogan err); 122930a7eb97STahsin Erdogan continue; 123030a7eb97STahsin Erdogan } 1231a4130367SJan Kara if (err > 0) { 1232188c299eSJan Kara err = ext4_journal_get_write_access(handle, 1233188c299eSJan Kara parent->i_sb, bh, EXT4_JTR_NONE); 1234a4130367SJan Kara if (err) { 1235a4130367SJan Kara ext4_warning_inode(ea_inode, 1236a4130367SJan Kara "Re-get write access err=%d", 1237a4130367SJan Kara err); 1238a4130367SJan Kara continue; 1239a4130367SJan Kara } 1240a4130367SJan Kara } 124130a7eb97STahsin Erdogan 1242dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1243dec214d0STahsin Erdogan if (err) { 1244dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", 1245dec214d0STahsin Erdogan err); 1246dec214d0STahsin Erdogan continue; 1247dec214d0STahsin Erdogan } 1248dec214d0STahsin Erdogan 1249dec214d0STahsin Erdogan if (!skip_quota) 1250a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(parent, ea_inode, 1251dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 125230a7eb97STahsin Erdogan 125330a7eb97STahsin Erdogan /* 125430a7eb97STahsin Erdogan * Forget about ea_inode within the same transaction that 125530a7eb97STahsin Erdogan * decrements the ref count. This avoids duplicate decrements in 125630a7eb97STahsin Erdogan * case the rest of the work spills over to subsequent 125730a7eb97STahsin Erdogan * transactions. 125830a7eb97STahsin Erdogan */ 125930a7eb97STahsin Erdogan entry->e_value_inum = 0; 126030a7eb97STahsin Erdogan entry->e_value_size = 0; 126130a7eb97STahsin Erdogan 126230a7eb97STahsin Erdogan dirty = true; 126330a7eb97STahsin Erdogan } 126430a7eb97STahsin Erdogan 126530a7eb97STahsin Erdogan if (dirty) { 126630a7eb97STahsin Erdogan /* 126730a7eb97STahsin Erdogan * Note that we are deliberately skipping csum calculation for 126830a7eb97STahsin Erdogan * the final update because we do not expect any journal 126930a7eb97STahsin Erdogan * restarts until xattr block is freed. 127030a7eb97STahsin Erdogan */ 127130a7eb97STahsin Erdogan 127230a7eb97STahsin Erdogan err = ext4_handle_dirty_metadata(handle, NULL, bh); 127330a7eb97STahsin Erdogan if (err) 127430a7eb97STahsin Erdogan ext4_warning_inode(parent, 127530a7eb97STahsin Erdogan "handle dirty metadata err=%d", err); 127630a7eb97STahsin Erdogan } 127730a7eb97STahsin Erdogan } 127830a7eb97STahsin Erdogan 1279ac27a0ecSDave Kleikamp /* 1280ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 1281ec4cb1aaSJan Kara * otherwise free the block. 1282ac27a0ecSDave Kleikamp */ 1283ac27a0ecSDave Kleikamp static void 1284617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 1285dec214d0STahsin Erdogan struct buffer_head *bh, 1286dec214d0STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1287dec214d0STahsin Erdogan int extra_credits) 1288ac27a0ecSDave Kleikamp { 128947387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 12906048c64bSAndreas Gruenbacher u32 hash, ref; 12918a2bfdcbSMingming Cao int error = 0; 1292ac27a0ecSDave Kleikamp 12935d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 1294188c299eSJan Kara error = ext4_journal_get_write_access(handle, inode->i_sb, bh, 1295188c299eSJan Kara EXT4_JTR_NONE); 12968a2bfdcbSMingming Cao if (error) 12978a2bfdcbSMingming Cao goto out; 12988a2bfdcbSMingming Cao 129965f8b800SJan Kara retry_ref: 13008a2bfdcbSMingming Cao lock_buffer(bh); 13016048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 13026048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 13036048c64bSAndreas Gruenbacher if (ref == 1) { 1304ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 130582939d79SJan Kara /* 130682939d79SJan Kara * This must happen under buffer lock for 130782939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 130882939d79SJan Kara */ 130965f8b800SJan Kara if (ea_block_cache) { 131065f8b800SJan Kara struct mb_cache_entry *oe; 131165f8b800SJan Kara 131265f8b800SJan Kara oe = mb_cache_entry_delete_or_get(ea_block_cache, hash, 1313cdb7ee4cSTahsin Erdogan bh->b_blocknr); 131465f8b800SJan Kara if (oe) { 131565f8b800SJan Kara unlock_buffer(bh); 131665f8b800SJan Kara mb_cache_entry_wait_unused(oe); 131765f8b800SJan Kara mb_cache_entry_put(ea_block_cache, oe); 131865f8b800SJan Kara goto retry_ref; 131965f8b800SJan Kara } 132065f8b800SJan Kara } 1321ac27a0ecSDave Kleikamp get_bh(bh); 1322ec4cb1aaSJan Kara unlock_buffer(bh); 1323dec214d0STahsin Erdogan 1324dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) 1325dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, bh, 1326dec214d0STahsin Erdogan BFIRST(bh), 1327dec214d0STahsin Erdogan true /* block_csum */, 1328dec214d0STahsin Erdogan ea_inode_array, 1329dec214d0STahsin Erdogan extra_credits, 1330dec214d0STahsin Erdogan true /* skip_quota */); 1331e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 1332e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 1333e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 1334ac27a0ecSDave Kleikamp } else { 13356048c64bSAndreas Gruenbacher ref--; 13366048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 13376048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 13386048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 13396048c64bSAndreas Gruenbacher 1340cdb7ee4cSTahsin Erdogan if (ea_block_cache) { 134147387409STahsin Erdogan ce = mb_cache_entry_get(ea_block_cache, hash, 13426048c64bSAndreas Gruenbacher bh->b_blocknr); 13436048c64bSAndreas Gruenbacher if (ce) { 1344a44e84a9SJan Kara set_bit(MBE_REUSABLE_B, &ce->e_flags); 134547387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 13466048c64bSAndreas Gruenbacher } 13476048c64bSAndreas Gruenbacher } 1348cdb7ee4cSTahsin Erdogan } 13496048c64bSAndreas Gruenbacher 1350dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bh); 1351ec4cb1aaSJan Kara /* 1352ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 1353ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 1354ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 1355ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 1356ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 1357dac7a4b4STheodore Ts'o * call ext4_handle_dirty_metadata() with locked buffer as 1358ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 1359ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 1360ec4cb1aaSJan Kara */ 1361ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 1362dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1363c1bb05a6SEric Sandeen unlock_buffer(bh); 1364ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 1365dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1366ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 13670390131bSFrank Mayhar ext4_handle_sync(handle); 13681231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 1369ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 1370ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 1371ac27a0ecSDave Kleikamp } 13728a2bfdcbSMingming Cao out: 13738a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 13748a2bfdcbSMingming Cao return; 1375ac27a0ecSDave Kleikamp } 1376ac27a0ecSDave Kleikamp 13776dd4ee7cSKalpak Shah /* 13786dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 13796dd4ee7cSKalpak Shah * bytes used by EA entries. 13806dd4ee7cSKalpak Shah */ 13816dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 13826dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 13836dd4ee7cSKalpak Shah { 13846dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1385e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 13866dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 13876dd4ee7cSKalpak Shah if (offs < *min_offs) 13886dd4ee7cSKalpak Shah *min_offs = offs; 13896dd4ee7cSKalpak Shah } 13907b1b2c1bSTheodore Ts'o if (total) 13917b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 13926dd4ee7cSKalpak Shah } 13936dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 13946dd4ee7cSKalpak Shah } 13956dd4ee7cSKalpak Shah 1396e50e5129SAndreas Dilger /* 1397e50e5129SAndreas Dilger * Write the value of the EA in an inode. 1398e50e5129SAndreas Dilger */ 1399e50e5129SAndreas Dilger static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, 1400e50e5129SAndreas Dilger const void *buf, int bufsize) 1401e50e5129SAndreas Dilger { 1402e50e5129SAndreas Dilger struct buffer_head *bh = NULL; 1403e50e5129SAndreas Dilger unsigned long block = 0; 1404dec214d0STahsin Erdogan int blocksize = ea_inode->i_sb->s_blocksize; 1405dec214d0STahsin Erdogan int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; 1406e50e5129SAndreas Dilger int csize, wsize = 0; 14074209ae12SHarshad Shirwadkar int ret = 0, ret2 = 0; 1408e50e5129SAndreas Dilger int retries = 0; 1409e50e5129SAndreas Dilger 1410e50e5129SAndreas Dilger retry: 1411e50e5129SAndreas Dilger while (ret >= 0 && ret < max_blocks) { 1412e50e5129SAndreas Dilger struct ext4_map_blocks map; 1413e50e5129SAndreas Dilger map.m_lblk = block += ret; 1414e50e5129SAndreas Dilger map.m_len = max_blocks -= ret; 1415e50e5129SAndreas Dilger 1416e50e5129SAndreas Dilger ret = ext4_map_blocks(handle, ea_inode, &map, 1417e50e5129SAndreas Dilger EXT4_GET_BLOCKS_CREATE); 1418e50e5129SAndreas Dilger if (ret <= 0) { 1419e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1420e50e5129SAndreas Dilger if (ret == -ENOSPC && 1421e50e5129SAndreas Dilger ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { 1422e50e5129SAndreas Dilger ret = 0; 1423e50e5129SAndreas Dilger goto retry; 1424e50e5129SAndreas Dilger } 1425e50e5129SAndreas Dilger break; 1426e50e5129SAndreas Dilger } 1427e50e5129SAndreas Dilger } 1428e50e5129SAndreas Dilger 1429e50e5129SAndreas Dilger if (ret < 0) 1430e50e5129SAndreas Dilger return ret; 1431e50e5129SAndreas Dilger 1432e50e5129SAndreas Dilger block = 0; 1433e50e5129SAndreas Dilger while (wsize < bufsize) { 1434e50e5129SAndreas Dilger brelse(bh); 1435e50e5129SAndreas Dilger csize = (bufsize - wsize) > blocksize ? blocksize : 1436e50e5129SAndreas Dilger bufsize - wsize; 1437e50e5129SAndreas Dilger bh = ext4_getblk(handle, ea_inode, block, 0); 1438e50e5129SAndreas Dilger if (IS_ERR(bh)) 1439e50e5129SAndreas Dilger return PTR_ERR(bh); 1440eb6984faSVasily Averin if (!bh) { 1441eb6984faSVasily Averin WARN_ON_ONCE(1); 1442eb6984faSVasily Averin EXT4_ERROR_INODE(ea_inode, 1443eb6984faSVasily Averin "ext4_getblk() return bh = NULL"); 1444eb6984faSVasily Averin return -EFSCORRUPTED; 1445eb6984faSVasily Averin } 1446188c299eSJan Kara ret = ext4_journal_get_write_access(handle, ea_inode->i_sb, bh, 1447188c299eSJan Kara EXT4_JTR_NONE); 1448e50e5129SAndreas Dilger if (ret) 1449e50e5129SAndreas Dilger goto out; 1450e50e5129SAndreas Dilger 1451e50e5129SAndreas Dilger memcpy(bh->b_data, buf, csize); 1452e50e5129SAndreas Dilger set_buffer_uptodate(bh); 1453e50e5129SAndreas Dilger ext4_handle_dirty_metadata(handle, ea_inode, bh); 1454e50e5129SAndreas Dilger 1455e50e5129SAndreas Dilger buf += csize; 1456e50e5129SAndreas Dilger wsize += csize; 1457e50e5129SAndreas Dilger block += 1; 1458e50e5129SAndreas Dilger } 1459e50e5129SAndreas Dilger 1460e50e5129SAndreas Dilger inode_lock(ea_inode); 1461e50e5129SAndreas Dilger i_size_write(ea_inode, wsize); 1462e50e5129SAndreas Dilger ext4_update_i_disksize(ea_inode, wsize); 1463e50e5129SAndreas Dilger inode_unlock(ea_inode); 1464e50e5129SAndreas Dilger 14654209ae12SHarshad Shirwadkar ret2 = ext4_mark_inode_dirty(handle, ea_inode); 14664209ae12SHarshad Shirwadkar if (unlikely(ret2 && !ret)) 14674209ae12SHarshad Shirwadkar ret = ret2; 1468e50e5129SAndreas Dilger 1469e50e5129SAndreas Dilger out: 1470e50e5129SAndreas Dilger brelse(bh); 1471e50e5129SAndreas Dilger 1472e50e5129SAndreas Dilger return ret; 1473e50e5129SAndreas Dilger } 1474e50e5129SAndreas Dilger 1475e50e5129SAndreas Dilger /* 1476e50e5129SAndreas Dilger * Create an inode to store the value of a large EA. 1477e50e5129SAndreas Dilger */ 1478e50e5129SAndreas Dilger static struct inode *ext4_xattr_inode_create(handle_t *handle, 1479dec214d0STahsin Erdogan struct inode *inode, u32 hash) 1480e50e5129SAndreas Dilger { 1481e50e5129SAndreas Dilger struct inode *ea_inode = NULL; 14829e1ba001STahsin Erdogan uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; 1483bd3b963bSTahsin Erdogan int err; 1484e50e5129SAndreas Dilger 1485f31173c1SJun Nie if (inode->i_sb->s_root == NULL) { 1486f31173c1SJun Nie ext4_warning(inode->i_sb, 1487f31173c1SJun Nie "refuse to create EA inode when umounting"); 1488f31173c1SJun Nie WARN_ON(1); 1489f31173c1SJun Nie return ERR_PTR(-EINVAL); 1490f31173c1SJun Nie } 1491f31173c1SJun Nie 1492e50e5129SAndreas Dilger /* 1493e50e5129SAndreas Dilger * Let the next inode be the goal, so we try and allocate the EA inode 1494e50e5129SAndreas Dilger * in the same group, or nearby one. 1495e50e5129SAndreas Dilger */ 1496e50e5129SAndreas Dilger ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, 14979e1ba001STahsin Erdogan S_IFREG | 0600, NULL, inode->i_ino + 1, owner, 14981b917ed8STahsin Erdogan EXT4_EA_INODE_FL); 1499e50e5129SAndreas Dilger if (!IS_ERR(ea_inode)) { 1500e50e5129SAndreas Dilger ea_inode->i_op = &ext4_file_inode_operations; 1501e50e5129SAndreas Dilger ea_inode->i_fop = &ext4_file_operations; 1502e50e5129SAndreas Dilger ext4_set_aops(ea_inode); 150333d201e0STahsin Erdogan ext4_xattr_inode_set_class(ea_inode); 1504e50e5129SAndreas Dilger unlock_new_inode(ea_inode); 1505dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, 1); 1506dec214d0STahsin Erdogan ext4_xattr_inode_set_hash(ea_inode, hash); 1507dec214d0STahsin Erdogan err = ext4_mark_inode_dirty(handle, ea_inode); 1508dec214d0STahsin Erdogan if (!err) 1509bd3b963bSTahsin Erdogan err = ext4_inode_attach_jinode(ea_inode); 1510bd3b963bSTahsin Erdogan if (err) { 1511e4db04f7SYe Bin if (ext4_xattr_inode_dec_ref(handle, ea_inode)) 1512e4db04f7SYe Bin ext4_warning_inode(ea_inode, 1513e4db04f7SYe Bin "cleanup dec ref error %d", err); 1514bd3b963bSTahsin Erdogan iput(ea_inode); 1515bd3b963bSTahsin Erdogan return ERR_PTR(err); 1516bd3b963bSTahsin Erdogan } 1517dec214d0STahsin Erdogan 1518dec214d0STahsin Erdogan /* 1519dec214d0STahsin Erdogan * Xattr inodes are shared therefore quota charging is performed 1520dec214d0STahsin Erdogan * at a higher level. 1521dec214d0STahsin Erdogan */ 1522dec214d0STahsin Erdogan dquot_free_inode(ea_inode); 1523dec214d0STahsin Erdogan dquot_drop(ea_inode); 1524dec214d0STahsin Erdogan inode_lock(ea_inode); 1525dec214d0STahsin Erdogan ea_inode->i_flags |= S_NOQUOTA; 1526dec214d0STahsin Erdogan inode_unlock(ea_inode); 1527e50e5129SAndreas Dilger } 1528e50e5129SAndreas Dilger 1529e50e5129SAndreas Dilger return ea_inode; 1530e50e5129SAndreas Dilger } 1531e50e5129SAndreas Dilger 1532dec214d0STahsin Erdogan static struct inode * 1533dec214d0STahsin Erdogan ext4_xattr_inode_cache_find(struct inode *inode, const void *value, 1534dec214d0STahsin Erdogan size_t value_len, u32 hash) 1535e50e5129SAndreas Dilger { 1536dec214d0STahsin Erdogan struct inode *ea_inode; 1537dec214d0STahsin Erdogan struct mb_cache_entry *ce; 1538dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 1539dec214d0STahsin Erdogan void *ea_data; 1540e50e5129SAndreas Dilger 1541cdb7ee4cSTahsin Erdogan if (!ea_inode_cache) 1542cdb7ee4cSTahsin Erdogan return NULL; 1543cdb7ee4cSTahsin Erdogan 1544dec214d0STahsin Erdogan ce = mb_cache_entry_find_first(ea_inode_cache, hash); 1545dec214d0STahsin Erdogan if (!ce) 1546dec214d0STahsin Erdogan return NULL; 1547e50e5129SAndreas Dilger 1548163f0ec1SJan Kara WARN_ON_ONCE(ext4_handle_valid(journal_current_handle()) && 1549163f0ec1SJan Kara !(current->flags & PF_MEMALLOC_NOFS)); 1550163f0ec1SJan Kara 155171b565ceSTheodore Ts'o ea_data = kvmalloc(value_len, GFP_KERNEL); 1552dec214d0STahsin Erdogan if (!ea_data) { 1553dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1554dec214d0STahsin Erdogan return NULL; 1555dec214d0STahsin Erdogan } 1556dec214d0STahsin Erdogan 1557dec214d0STahsin Erdogan while (ce) { 15588a363970STheodore Ts'o ea_inode = ext4_iget(inode->i_sb, ce->e_value, 15598a363970STheodore Ts'o EXT4_IGET_NORMAL); 1560dec214d0STahsin Erdogan if (!IS_ERR(ea_inode) && 1561dec214d0STahsin Erdogan !is_bad_inode(ea_inode) && 1562dec214d0STahsin Erdogan (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && 1563dec214d0STahsin Erdogan i_size_read(ea_inode) == value_len && 1564dec214d0STahsin Erdogan !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && 1565b9fc761eSTahsin Erdogan !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, 1566dec214d0STahsin Erdogan value_len) && 1567dec214d0STahsin Erdogan !memcmp(value, ea_data, value_len)) { 1568dec214d0STahsin Erdogan mb_cache_entry_touch(ea_inode_cache, ce); 1569dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1570dec214d0STahsin Erdogan kvfree(ea_data); 1571dec214d0STahsin Erdogan return ea_inode; 1572dec214d0STahsin Erdogan } 1573dec214d0STahsin Erdogan 1574dec214d0STahsin Erdogan if (!IS_ERR(ea_inode)) 1575e50e5129SAndreas Dilger iput(ea_inode); 1576dec214d0STahsin Erdogan ce = mb_cache_entry_find_next(ea_inode_cache, ce); 1577dec214d0STahsin Erdogan } 1578dec214d0STahsin Erdogan kvfree(ea_data); 1579dec214d0STahsin Erdogan return NULL; 1580e50e5129SAndreas Dilger } 1581e50e5129SAndreas Dilger 1582e50e5129SAndreas Dilger /* 1583e50e5129SAndreas Dilger * Add value of the EA in an inode. 1584e50e5129SAndreas Dilger */ 1585dec214d0STahsin Erdogan static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, 1586dec214d0STahsin Erdogan const void *value, size_t value_len, 1587dec214d0STahsin Erdogan struct inode **ret_inode) 1588e50e5129SAndreas Dilger { 1589e50e5129SAndreas Dilger struct inode *ea_inode; 1590dec214d0STahsin Erdogan u32 hash; 1591e50e5129SAndreas Dilger int err; 1592e50e5129SAndreas Dilger 1593dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); 1594dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); 1595dec214d0STahsin Erdogan if (ea_inode) { 1596dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1597dec214d0STahsin Erdogan if (err) { 1598dec214d0STahsin Erdogan iput(ea_inode); 1599dec214d0STahsin Erdogan return err; 1600dec214d0STahsin Erdogan } 1601dec214d0STahsin Erdogan 1602dec214d0STahsin Erdogan *ret_inode = ea_inode; 1603dec214d0STahsin Erdogan return 0; 1604dec214d0STahsin Erdogan } 1605dec214d0STahsin Erdogan 1606e50e5129SAndreas Dilger /* Create an inode for the EA value */ 1607dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_create(handle, inode, hash); 1608e50e5129SAndreas Dilger if (IS_ERR(ea_inode)) 1609e50e5129SAndreas Dilger return PTR_ERR(ea_inode); 1610e50e5129SAndreas Dilger 1611e50e5129SAndreas Dilger err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); 1612dec214d0STahsin Erdogan if (err) { 161356d0d0b9SLi Zhong if (ext4_xattr_inode_dec_ref(handle, ea_inode)) 161456d0d0b9SLi Zhong ext4_warning_inode(ea_inode, "cleanup dec ref error %d", err); 1615e50e5129SAndreas Dilger iput(ea_inode); 1616e50e5129SAndreas Dilger return err; 1617e50e5129SAndreas Dilger } 1618e50e5129SAndreas Dilger 1619cdb7ee4cSTahsin Erdogan if (EA_INODE_CACHE(inode)) 1620dec214d0STahsin Erdogan mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, 1621dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 1622dec214d0STahsin Erdogan 1623dec214d0STahsin Erdogan *ret_inode = ea_inode; 1624dec214d0STahsin Erdogan return 0; 1625dec214d0STahsin Erdogan } 1626dec214d0STahsin Erdogan 16279c6e7853STahsin Erdogan /* 16289c6e7853STahsin Erdogan * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode 16299c6e7853STahsin Erdogan * feature is enabled. 16309c6e7853STahsin Erdogan */ 16319c6e7853STahsin Erdogan #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) 16329c6e7853STahsin Erdogan 1633e50e5129SAndreas Dilger static int ext4_xattr_set_entry(struct ext4_xattr_info *i, 1634e50e5129SAndreas Dilger struct ext4_xattr_search *s, 1635daf83281STahsin Erdogan handle_t *handle, struct inode *inode, 1636daf83281STahsin Erdogan bool is_block) 1637ac27a0ecSDave Kleikamp { 16385369a762STheodore Ts'o struct ext4_xattr_entry *last, *next; 1639dec214d0STahsin Erdogan struct ext4_xattr_entry *here = s->here; 1640dec214d0STahsin Erdogan size_t min_offs = s->end - s->base, name_len = strlen(i->name); 1641e50e5129SAndreas Dilger int in_inode = i->in_inode; 1642dec214d0STahsin Erdogan struct inode *old_ea_inode = NULL; 1643dec214d0STahsin Erdogan struct inode *new_ea_inode = NULL; 1644dec214d0STahsin Erdogan size_t old_size, new_size; 1645dec214d0STahsin Erdogan int ret; 1646dec214d0STahsin Erdogan 1647dec214d0STahsin Erdogan /* Space used by old and new values. */ 1648dec214d0STahsin Erdogan old_size = (!s->not_found && !here->e_value_inum) ? 1649dec214d0STahsin Erdogan EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; 1650dec214d0STahsin Erdogan new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; 1651dec214d0STahsin Erdogan 1652dec214d0STahsin Erdogan /* 1653dec214d0STahsin Erdogan * Optimization for the simple case when old and new values have the 1654dec214d0STahsin Erdogan * same padded sizes. Not applicable if external inodes are involved. 1655dec214d0STahsin Erdogan */ 1656dec214d0STahsin Erdogan if (new_size && new_size == old_size) { 1657dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1658dec214d0STahsin Erdogan void *val = s->base + offs; 1659dec214d0STahsin Erdogan 1660dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1661dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1662dec214d0STahsin Erdogan memset(val, 0, new_size); 1663dec214d0STahsin Erdogan } else { 1664dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1665dec214d0STahsin Erdogan /* Clear padding bytes. */ 1666dec214d0STahsin Erdogan memset(val + i->value_len, 0, new_size - i->value_len); 1667dec214d0STahsin Erdogan } 166832aaf194STahsin Erdogan goto update_hash; 1669dec214d0STahsin Erdogan } 1670e50e5129SAndreas Dilger 1671ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 1672ac27a0ecSDave Kleikamp last = s->first; 16735369a762STheodore Ts'o for (; !IS_LAST_ENTRY(last); last = next) { 16745369a762STheodore Ts'o next = EXT4_XATTR_NEXT(last); 16755369a762STheodore Ts'o if ((void *)next >= s->end) { 16765369a762STheodore Ts'o EXT4_ERROR_INODE(inode, "corrupted xattr entries"); 16775369a762STheodore Ts'o ret = -EFSCORRUPTED; 16785369a762STheodore Ts'o goto out; 16795369a762STheodore Ts'o } 1680e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 1681ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 1682ac27a0ecSDave Kleikamp if (offs < min_offs) 1683ac27a0ecSDave Kleikamp min_offs = offs; 1684ac27a0ecSDave Kleikamp } 1685ac27a0ecSDave Kleikamp } 1686dec214d0STahsin Erdogan 1687dec214d0STahsin Erdogan /* Check whether we have enough space. */ 1688ac27a0ecSDave Kleikamp if (i->value) { 1689dec214d0STahsin Erdogan size_t free; 1690e50e5129SAndreas Dilger 1691dec214d0STahsin Erdogan free = min_offs - ((void *)last - s->base) - sizeof(__u32); 1692dec214d0STahsin Erdogan if (!s->not_found) 1693dec214d0STahsin Erdogan free += EXT4_XATTR_LEN(name_len) + old_size; 1694e50e5129SAndreas Dilger 1695dec214d0STahsin Erdogan if (free < EXT4_XATTR_LEN(name_len) + new_size) { 1696dec214d0STahsin Erdogan ret = -ENOSPC; 1697dec214d0STahsin Erdogan goto out; 1698dec214d0STahsin Erdogan } 16999c6e7853STahsin Erdogan 17009c6e7853STahsin Erdogan /* 17019c6e7853STahsin Erdogan * If storing the value in an external inode is an option, 17029c6e7853STahsin Erdogan * reserve space for xattr entries/names in the external 17039c6e7853STahsin Erdogan * attribute block so that a long value does not occupy the 17043088e5a5SBhaskar Chowdhury * whole space and prevent further entries being added. 17059c6e7853STahsin Erdogan */ 1706daf83281STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 1707daf83281STahsin Erdogan new_size && is_block && 17089c6e7853STahsin Erdogan (min_offs + old_size - new_size) < 17099c6e7853STahsin Erdogan EXT4_XATTR_BLOCK_RESERVE(inode)) { 17109c6e7853STahsin Erdogan ret = -ENOSPC; 17119c6e7853STahsin Erdogan goto out; 17129c6e7853STahsin Erdogan } 1713ac27a0ecSDave Kleikamp } 1714ac27a0ecSDave Kleikamp 1715dec214d0STahsin Erdogan /* 1716dec214d0STahsin Erdogan * Getting access to old and new ea inodes is subject to failures. 1717dec214d0STahsin Erdogan * Finish that work before doing any modifications to the xattr data. 1718dec214d0STahsin Erdogan */ 1719dec214d0STahsin Erdogan if (!s->not_found && here->e_value_inum) { 1720dec214d0STahsin Erdogan ret = ext4_xattr_inode_iget(inode, 1721dec214d0STahsin Erdogan le32_to_cpu(here->e_value_inum), 1722a6d05676STahsin Erdogan le32_to_cpu(here->e_hash), 1723dec214d0STahsin Erdogan &old_ea_inode); 1724dec214d0STahsin Erdogan if (ret) { 1725dec214d0STahsin Erdogan old_ea_inode = NULL; 1726dec214d0STahsin Erdogan goto out; 1727bd9926e8STheodore Ts'o } 1728dec214d0STahsin Erdogan } 1729dec214d0STahsin Erdogan if (i->value && in_inode) { 1730dec214d0STahsin Erdogan WARN_ON_ONCE(!i->value_len); 1731dec214d0STahsin Erdogan 1732dec214d0STahsin Erdogan ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); 1733dec214d0STahsin Erdogan if (ret) 1734dec214d0STahsin Erdogan goto out; 1735dec214d0STahsin Erdogan 1736dec214d0STahsin Erdogan ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, 1737dec214d0STahsin Erdogan i->value_len, 1738dec214d0STahsin Erdogan &new_ea_inode); 1739dec214d0STahsin Erdogan if (ret) { 1740dec214d0STahsin Erdogan new_ea_inode = NULL; 1741a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, NULL, i->value_len); 1742dec214d0STahsin Erdogan goto out; 1743dec214d0STahsin Erdogan } 1744ac27a0ecSDave Kleikamp } 1745ac27a0ecSDave Kleikamp 1746dec214d0STahsin Erdogan if (old_ea_inode) { 1747dec214d0STahsin Erdogan /* We are ready to release ref count on the old_ea_inode. */ 1748dec214d0STahsin Erdogan ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); 1749dec214d0STahsin Erdogan if (ret) { 1750dec214d0STahsin Erdogan /* Release newly required ref count on new_ea_inode. */ 1751dec214d0STahsin Erdogan if (new_ea_inode) { 1752dec214d0STahsin Erdogan int err; 1753dec214d0STahsin Erdogan 1754dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, 1755dec214d0STahsin Erdogan new_ea_inode); 1756dec214d0STahsin Erdogan if (err) 1757dec214d0STahsin Erdogan ext4_warning_inode(new_ea_inode, 1758dec214d0STahsin Erdogan "dec ref new_ea_inode err=%d", 1759dec214d0STahsin Erdogan err); 1760a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, new_ea_inode, 1761dec214d0STahsin Erdogan i->value_len); 1762dec214d0STahsin Erdogan } 1763dec214d0STahsin Erdogan goto out; 1764dec214d0STahsin Erdogan } 1765dec214d0STahsin Erdogan 1766a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, old_ea_inode, 1767dec214d0STahsin Erdogan le32_to_cpu(here->e_value_size)); 1768dec214d0STahsin Erdogan } 1769dec214d0STahsin Erdogan 1770dec214d0STahsin Erdogan /* No failures allowed past this point. */ 1771dec214d0STahsin Erdogan 1772e5d01196STheodore Ts'o if (!s->not_found && here->e_value_size && !here->e_value_inum) { 1773ac27a0ecSDave Kleikamp /* Remove the old value. */ 1774dec214d0STahsin Erdogan void *first_val = s->base + min_offs; 1775dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1776dec214d0STahsin Erdogan void *val = s->base + offs; 1777dec214d0STahsin Erdogan 1778dec214d0STahsin Erdogan memmove(first_val + old_size, first_val, val - first_val); 1779dec214d0STahsin Erdogan memset(first_val, 0, old_size); 1780dec214d0STahsin Erdogan min_offs += old_size; 1781ac27a0ecSDave Kleikamp 1782ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 1783ac27a0ecSDave Kleikamp last = s->first; 1784ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 1785ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 1786dec214d0STahsin Erdogan 1787e50e5129SAndreas Dilger if (!last->e_value_inum && 1788e50e5129SAndreas Dilger last->e_value_size && o < offs) 1789dec214d0STahsin Erdogan last->e_value_offs = cpu_to_le16(o + old_size); 1790617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 1791ac27a0ecSDave Kleikamp } 1792ac27a0ecSDave Kleikamp } 1793dec214d0STahsin Erdogan 1794ac27a0ecSDave Kleikamp if (!i->value) { 1795dec214d0STahsin Erdogan /* Remove old name. */ 1796617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 1797dec214d0STahsin Erdogan 1798ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 1799dec214d0STahsin Erdogan memmove(here, (void *)here + size, 1800dec214d0STahsin Erdogan (void *)last - (void *)here + sizeof(__u32)); 1801ac27a0ecSDave Kleikamp memset(last, 0, size); 1802dec214d0STahsin Erdogan } else if (s->not_found) { 1803dec214d0STahsin Erdogan /* Insert new name. */ 1804dec214d0STahsin Erdogan size_t size = EXT4_XATTR_LEN(name_len); 1805dec214d0STahsin Erdogan size_t rest = (void *)last - (void *)here + sizeof(__u32); 1806dec214d0STahsin Erdogan 1807dec214d0STahsin Erdogan memmove((void *)here + size, here, rest); 1808dec214d0STahsin Erdogan memset(here, 0, size); 1809dec214d0STahsin Erdogan here->e_name_index = i->name_index; 1810dec214d0STahsin Erdogan here->e_name_len = name_len; 1811dec214d0STahsin Erdogan memcpy(here->e_name, i->name, name_len); 1812dec214d0STahsin Erdogan } else { 1813dec214d0STahsin Erdogan /* This is an update, reset value info. */ 1814dec214d0STahsin Erdogan here->e_value_inum = 0; 1815dec214d0STahsin Erdogan here->e_value_offs = 0; 1816dec214d0STahsin Erdogan here->e_value_size = 0; 1817ac27a0ecSDave Kleikamp } 1818ac27a0ecSDave Kleikamp 1819ac27a0ecSDave Kleikamp if (i->value) { 1820dec214d0STahsin Erdogan /* Insert new value. */ 1821e50e5129SAndreas Dilger if (in_inode) { 1822dec214d0STahsin Erdogan here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); 1823e50e5129SAndreas Dilger } else if (i->value_len) { 1824dec214d0STahsin Erdogan void *val = s->base + min_offs - new_size; 1825e50e5129SAndreas Dilger 1826dec214d0STahsin Erdogan here->e_value_offs = cpu_to_le16(min_offs - new_size); 1827dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1828dec214d0STahsin Erdogan memset(val, 0, new_size); 1829dec214d0STahsin Erdogan } else { 1830dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1831dec214d0STahsin Erdogan /* Clear padding bytes. */ 1832dec214d0STahsin Erdogan memset(val + i->value_len, 0, 1833dec214d0STahsin Erdogan new_size - i->value_len); 1834dec214d0STahsin Erdogan } 1835dec214d0STahsin Erdogan } 1836dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1837dec214d0STahsin Erdogan } 1838daf83281STahsin Erdogan 183932aaf194STahsin Erdogan update_hash: 1840b9fc761eSTahsin Erdogan if (i->value) { 1841b9fc761eSTahsin Erdogan __le32 hash = 0; 1842b9fc761eSTahsin Erdogan 1843b9fc761eSTahsin Erdogan /* Entry hash calculation. */ 1844b9fc761eSTahsin Erdogan if (in_inode) { 1845b9fc761eSTahsin Erdogan __le32 crc32c_hash; 1846b9fc761eSTahsin Erdogan 1847b9fc761eSTahsin Erdogan /* 1848b9fc761eSTahsin Erdogan * Feed crc32c hash instead of the raw value for entry 1849b9fc761eSTahsin Erdogan * hash calculation. This is to avoid walking 1850b9fc761eSTahsin Erdogan * potentially long value buffer again. 1851b9fc761eSTahsin Erdogan */ 1852b9fc761eSTahsin Erdogan crc32c_hash = cpu_to_le32( 1853b9fc761eSTahsin Erdogan ext4_xattr_inode_get_hash(new_ea_inode)); 1854b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1855b9fc761eSTahsin Erdogan here->e_name_len, 1856b9fc761eSTahsin Erdogan &crc32c_hash, 1); 1857b9fc761eSTahsin Erdogan } else if (is_block) { 185832aaf194STahsin Erdogan __le32 *value = s->base + le16_to_cpu( 185932aaf194STahsin Erdogan here->e_value_offs); 1860b9fc761eSTahsin Erdogan 1861b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1862b9fc761eSTahsin Erdogan here->e_name_len, value, 1863b9fc761eSTahsin Erdogan new_size >> 2); 1864daf83281STahsin Erdogan } 1865b9fc761eSTahsin Erdogan here->e_hash = hash; 1866b9fc761eSTahsin Erdogan } 1867b9fc761eSTahsin Erdogan 1868b9fc761eSTahsin Erdogan if (is_block) 1869b9fc761eSTahsin Erdogan ext4_xattr_rehash((struct ext4_xattr_header *)s->base); 1870daf83281STahsin Erdogan 1871dec214d0STahsin Erdogan ret = 0; 1872e50e5129SAndreas Dilger out: 1873dec214d0STahsin Erdogan iput(old_ea_inode); 1874dec214d0STahsin Erdogan iput(new_ea_inode); 1875dec214d0STahsin Erdogan return ret; 1876ac27a0ecSDave Kleikamp } 1877ac27a0ecSDave Kleikamp 1878617ba13bSMingming Cao struct ext4_xattr_block_find { 1879617ba13bSMingming Cao struct ext4_xattr_search s; 1880ac27a0ecSDave Kleikamp struct buffer_head *bh; 1881ac27a0ecSDave Kleikamp }; 1882ac27a0ecSDave Kleikamp 1883ac27a0ecSDave Kleikamp static int 1884617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 1885617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1886ac27a0ecSDave Kleikamp { 1887ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1888ac27a0ecSDave Kleikamp int error; 1889ac27a0ecSDave Kleikamp 1890ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 1891ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 1892ac27a0ecSDave Kleikamp 1893617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 1894ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 1895fb265c9cSTheodore Ts'o bs->bh = ext4_sb_bread(sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 18968418897fSJeffle Xu if (IS_ERR(bs->bh)) { 18978418897fSJeffle Xu error = PTR_ERR(bs->bh); 18988418897fSJeffle Xu bs->bh = NULL; 18998418897fSJeffle Xu return error; 19008418897fSJeffle Xu } 1901ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 1902ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 1903ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 1904de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bs->bh); 1905de05ca85STheodore Ts'o if (error) 1906fb265c9cSTheodore Ts'o return error; 1907ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1908ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 1909ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 1910ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 1911ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 19129496005dSTheodore Ts'o error = xattr_find_entry(inode, &bs->s.here, bs->s.end, 19139496005dSTheodore Ts'o i->name_index, i->name, 1); 1914ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1915fb265c9cSTheodore Ts'o return error; 1916ac27a0ecSDave Kleikamp bs->s.not_found = error; 1917ac27a0ecSDave Kleikamp } 1918fb265c9cSTheodore Ts'o return 0; 1919ac27a0ecSDave Kleikamp } 1920ac27a0ecSDave Kleikamp 1921ac27a0ecSDave Kleikamp static int 1922617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 1923617ba13bSMingming Cao struct ext4_xattr_info *i, 1924617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1925ac27a0ecSDave Kleikamp { 1926ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1927ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 1928b347e2bcSTahsin Erdogan struct ext4_xattr_search s_copy = bs->s; 1929b347e2bcSTahsin Erdogan struct ext4_xattr_search *s = &s_copy; 19307a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 19318a2bfdcbSMingming Cao int error = 0; 193247387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 1933a6d05676STahsin Erdogan struct inode *ea_inode = NULL, *tmp_inode; 1934a6d05676STahsin Erdogan size_t old_ea_inode_quota = 0; 1935a6d05676STahsin Erdogan unsigned int ea_ino; 1936a6d05676STahsin Erdogan 1937ac27a0ecSDave Kleikamp 1938617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 1939ac27a0ecSDave Kleikamp 1940ac27a0ecSDave Kleikamp if (s->base) { 1941fd48e9acSJan Kara int offset = (char *)s->here - bs->bh->b_data; 1942fd48e9acSJan Kara 19435d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 1944188c299eSJan Kara error = ext4_journal_get_write_access(handle, sb, bs->bh, 1945188c299eSJan Kara EXT4_JTR_NONE); 19468a2bfdcbSMingming Cao if (error) 19478a2bfdcbSMingming Cao goto cleanup; 19488a2bfdcbSMingming Cao lock_buffer(bs->bh); 19498a2bfdcbSMingming Cao 1950ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 195182939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 195282939d79SJan Kara 195382939d79SJan Kara /* 195482939d79SJan Kara * This must happen under buffer lock for 195582939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 195682939d79SJan Kara * block 195782939d79SJan Kara */ 195865f8b800SJan Kara if (ea_block_cache) { 195965f8b800SJan Kara struct mb_cache_entry *oe; 196065f8b800SJan Kara 196165f8b800SJan Kara oe = mb_cache_entry_delete_or_get(ea_block_cache, 196265f8b800SJan Kara hash, bs->bh->b_blocknr); 196365f8b800SJan Kara if (oe) { 196465f8b800SJan Kara /* 196565f8b800SJan Kara * Xattr block is getting reused. Leave 196665f8b800SJan Kara * it alone. 196765f8b800SJan Kara */ 196865f8b800SJan Kara mb_cache_entry_put(ea_block_cache, oe); 196965f8b800SJan Kara goto clone_block; 197065f8b800SJan Kara } 197165f8b800SJan Kara } 1972ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 1973daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 1974daf83281STahsin Erdogan true /* is_block */); 1975dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bs->bh); 1976ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 19776a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1978ac27a0ecSDave Kleikamp goto bad_block; 1979ac27a0ecSDave Kleikamp if (!error) 1980dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 19810390131bSFrank Mayhar inode, 1982ac27a0ecSDave Kleikamp bs->bh); 1983ac27a0ecSDave Kleikamp if (error) 1984ac27a0ecSDave Kleikamp goto cleanup; 1985ac27a0ecSDave Kleikamp goto inserted; 1986fd48e9acSJan Kara } 198765f8b800SJan Kara clone_block: 19888a2bfdcbSMingming Cao unlock_buffer(bs->bh); 1989ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 19904efd9f0dSShuqi Zhang s->base = kmemdup(BHDR(bs->bh), bs->bh->b_size, GFP_NOFS); 1991ac27a0ecSDave Kleikamp error = -ENOMEM; 1992ac27a0ecSDave Kleikamp if (s->base == NULL) 1993ac27a0ecSDave Kleikamp goto cleanup; 1994ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1995ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1996ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 1997ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 1998dec214d0STahsin Erdogan 1999dec214d0STahsin Erdogan /* 2000dec214d0STahsin Erdogan * If existing entry points to an xattr inode, we need 2001dec214d0STahsin Erdogan * to prevent ext4_xattr_set_entry() from decrementing 2002dec214d0STahsin Erdogan * ref count on it because the reference belongs to the 2003dec214d0STahsin Erdogan * original block. In this case, make the entry look 2004dec214d0STahsin Erdogan * like it has an empty value. 2005dec214d0STahsin Erdogan */ 2006dec214d0STahsin Erdogan if (!s->not_found && s->here->e_value_inum) { 2007a6d05676STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 2008a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, 2009a6d05676STahsin Erdogan le32_to_cpu(s->here->e_hash), 2010a6d05676STahsin Erdogan &tmp_inode); 2011a6d05676STahsin Erdogan if (error) 2012a6d05676STahsin Erdogan goto cleanup; 2013a6d05676STahsin Erdogan 2014a6d05676STahsin Erdogan if (!ext4_test_inode_state(tmp_inode, 2015a6d05676STahsin Erdogan EXT4_STATE_LUSTRE_EA_INODE)) { 2016dec214d0STahsin Erdogan /* 2017a6d05676STahsin Erdogan * Defer quota free call for previous 2018a6d05676STahsin Erdogan * inode until success is guaranteed. 2019dec214d0STahsin Erdogan */ 2020a6d05676STahsin Erdogan old_ea_inode_quota = le32_to_cpu( 2021dec214d0STahsin Erdogan s->here->e_value_size); 2022a6d05676STahsin Erdogan } 2023a6d05676STahsin Erdogan iput(tmp_inode); 2024a6d05676STahsin Erdogan 2025dec214d0STahsin Erdogan s->here->e_value_inum = 0; 2026dec214d0STahsin Erdogan s->here->e_value_size = 0; 2027dec214d0STahsin Erdogan } 2028ac27a0ecSDave Kleikamp } else { 2029ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 2030216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 2031ac27a0ecSDave Kleikamp error = -ENOMEM; 2032ac27a0ecSDave Kleikamp if (s->base == NULL) 2033ac27a0ecSDave Kleikamp goto cleanup; 2034617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 2035ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 2036ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 2037ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 2038ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 2039ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 2040ac27a0ecSDave Kleikamp } 2041ac27a0ecSDave Kleikamp 2042daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); 20436a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 2044ac27a0ecSDave Kleikamp goto bad_block; 2045ac27a0ecSDave Kleikamp if (error) 2046ac27a0ecSDave Kleikamp goto cleanup; 2047dec214d0STahsin Erdogan 2048dec214d0STahsin Erdogan if (i->value && s->here->e_value_inum) { 2049dec214d0STahsin Erdogan /* 2050dec214d0STahsin Erdogan * A ref count on ea_inode has been taken as part of the call to 2051dec214d0STahsin Erdogan * ext4_xattr_set_entry() above. We would like to drop this 2052dec214d0STahsin Erdogan * extra ref but we have to wait until the xattr block is 2053dec214d0STahsin Erdogan * initialized and has its own ref count on the ea_inode. 2054dec214d0STahsin Erdogan */ 2055dec214d0STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 2056a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, 2057a6d05676STahsin Erdogan le32_to_cpu(s->here->e_hash), 2058a6d05676STahsin Erdogan &ea_inode); 2059dec214d0STahsin Erdogan if (error) { 2060dec214d0STahsin Erdogan ea_inode = NULL; 2061dec214d0STahsin Erdogan goto cleanup; 2062dec214d0STahsin Erdogan } 2063dec214d0STahsin Erdogan } 2064dec214d0STahsin Erdogan 2065ac27a0ecSDave Kleikamp inserted: 2066ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 206747387409STahsin Erdogan new_bh = ext4_xattr_block_cache_find(inode, header(s->base), 206847387409STahsin Erdogan &ce); 2069ac27a0ecSDave Kleikamp if (new_bh) { 2070ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 2071ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 2072ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 2073ac27a0ecSDave Kleikamp else { 20746048c64bSAndreas Gruenbacher u32 ref; 20756048c64bSAndreas Gruenbacher 2076b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 2077b8cb5a54STahsin Erdogan 2078ac27a0ecSDave Kleikamp /* The old block is released after updating 2079ac27a0ecSDave Kleikamp the inode. */ 20801231b3a1SLukas Czerner error = dquot_alloc_block(inode, 20811231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 20825dd4056dSChristoph Hellwig if (error) 2083ac27a0ecSDave Kleikamp goto cleanup; 20845d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 2085188c299eSJan Kara error = ext4_journal_get_write_access( 2086188c299eSJan Kara handle, sb, new_bh, 2087188c299eSJan Kara EXT4_JTR_NONE); 2088ac27a0ecSDave Kleikamp if (error) 2089ac27a0ecSDave Kleikamp goto cleanup_dquot; 2090ac27a0ecSDave Kleikamp lock_buffer(new_bh); 209182939d79SJan Kara /* 209282939d79SJan Kara * We have to be careful about races with 209365f8b800SJan Kara * adding references to xattr block. Once we 209465f8b800SJan Kara * hold buffer lock xattr block's state is 209565f8b800SJan Kara * stable so we can check the additional 209665f8b800SJan Kara * reference fits. 209782939d79SJan Kara */ 209865f8b800SJan Kara ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 209965f8b800SJan Kara if (ref > EXT4_XATTR_REFCOUNT_MAX) { 210082939d79SJan Kara /* 210182939d79SJan Kara * Undo everything and check mbcache 210282939d79SJan Kara * again. 210382939d79SJan Kara */ 210482939d79SJan Kara unlock_buffer(new_bh); 210582939d79SJan Kara dquot_free_block(inode, 210682939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 210782939d79SJan Kara 1)); 210882939d79SJan Kara brelse(new_bh); 210947387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 211082939d79SJan Kara ce = NULL; 211182939d79SJan Kara new_bh = NULL; 211282939d79SJan Kara goto inserted; 211382939d79SJan Kara } 21146048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 211565f8b800SJan Kara if (ref == EXT4_XATTR_REFCOUNT_MAX) 2116a44e84a9SJan Kara clear_bit(MBE_REUSABLE_B, &ce->e_flags); 2117ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 21186048c64bSAndreas Gruenbacher ref); 2119dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2120ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2121dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 21220390131bSFrank Mayhar inode, 2123ac27a0ecSDave Kleikamp new_bh); 2124ac27a0ecSDave Kleikamp if (error) 2125ac27a0ecSDave Kleikamp goto cleanup_dquot; 2126ac27a0ecSDave Kleikamp } 212747387409STahsin Erdogan mb_cache_entry_touch(ea_block_cache, ce); 212847387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2129ac27a0ecSDave Kleikamp ce = NULL; 2130ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 2131ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 2132ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 2133ec000220STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); 2134ac27a0ecSDave Kleikamp new_bh = bs->bh; 2135ac27a0ecSDave Kleikamp get_bh(new_bh); 2136ac27a0ecSDave Kleikamp } else { 2137ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 2138fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 2139fb0a387dSEric Sandeen 2140b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 2141b8cb5a54STahsin Erdogan 2142fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 2143d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 214455f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 214555f020dbSAllison Henderson NULL, &error); 2146ac27a0ecSDave Kleikamp if (error) 2147ac27a0ecSDave Kleikamp goto cleanup; 2148fb0a387dSEric Sandeen 2149ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 2150ace36ad4SJoe Perches (unsigned long long)block); 2151ac27a0ecSDave Kleikamp 2152ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 2153aebf0243SWang Shilong if (unlikely(!new_bh)) { 2154860d21e2STheodore Ts'o error = -ENOMEM; 2155ac27a0ecSDave Kleikamp getblk_failed: 21567dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 2157e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 2158ac27a0ecSDave Kleikamp goto cleanup; 2159ac27a0ecSDave Kleikamp } 2160dec214d0STahsin Erdogan error = ext4_xattr_inode_inc_ref_all(handle, inode, 2161dec214d0STahsin Erdogan ENTRY(header(s->base)+1)); 2162dec214d0STahsin Erdogan if (error) 2163dec214d0STahsin Erdogan goto getblk_failed; 2164dec214d0STahsin Erdogan if (ea_inode) { 2165dec214d0STahsin Erdogan /* Drop the extra ref on ea_inode. */ 2166dec214d0STahsin Erdogan error = ext4_xattr_inode_dec_ref(handle, 2167dec214d0STahsin Erdogan ea_inode); 2168dec214d0STahsin Erdogan if (error) 2169dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 2170dec214d0STahsin Erdogan "dec ref error=%d", 2171dec214d0STahsin Erdogan error); 2172dec214d0STahsin Erdogan iput(ea_inode); 2173dec214d0STahsin Erdogan ea_inode = NULL; 2174dec214d0STahsin Erdogan } 2175dec214d0STahsin Erdogan 2176ac27a0ecSDave Kleikamp lock_buffer(new_bh); 2177188c299eSJan Kara error = ext4_journal_get_create_access(handle, sb, 2178188c299eSJan Kara new_bh, EXT4_JTR_NONE); 2179ac27a0ecSDave Kleikamp if (error) { 2180ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2181860d21e2STheodore Ts'o error = -EIO; 2182ac27a0ecSDave Kleikamp goto getblk_failed; 2183ac27a0ecSDave Kleikamp } 2184ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 2185dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2186ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 2187ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 218847387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, new_bh); 2189dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, 2190dac7a4b4STheodore Ts'o new_bh); 2191ac27a0ecSDave Kleikamp if (error) 2192ac27a0ecSDave Kleikamp goto cleanup; 2193ac27a0ecSDave Kleikamp } 2194ac27a0ecSDave Kleikamp } 2195ac27a0ecSDave Kleikamp 2196a6d05676STahsin Erdogan if (old_ea_inode_quota) 2197a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, NULL, old_ea_inode_quota); 2198dec214d0STahsin Erdogan 2199ac27a0ecSDave Kleikamp /* Update the inode. */ 2200617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 2201ac27a0ecSDave Kleikamp 2202ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 2203dec214d0STahsin Erdogan if (bs->bh && bs->bh != new_bh) { 2204dec214d0STahsin Erdogan struct ext4_xattr_inode_array *ea_inode_array = NULL; 2205dec214d0STahsin Erdogan 2206dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bs->bh, 2207dec214d0STahsin Erdogan &ea_inode_array, 2208dec214d0STahsin Erdogan 0 /* extra_credits */); 2209dec214d0STahsin Erdogan ext4_xattr_inode_array_free(ea_inode_array); 2210dec214d0STahsin Erdogan } 2211ac27a0ecSDave Kleikamp error = 0; 2212ac27a0ecSDave Kleikamp 2213ac27a0ecSDave Kleikamp cleanup: 2214dec214d0STahsin Erdogan if (ea_inode) { 2215dec214d0STahsin Erdogan int error2; 2216dec214d0STahsin Erdogan 2217dec214d0STahsin Erdogan error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); 2218dec214d0STahsin Erdogan if (error2) 2219dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "dec ref error=%d", 2220dec214d0STahsin Erdogan error2); 2221dec214d0STahsin Erdogan 2222dec214d0STahsin Erdogan /* If there was an error, revert the quota charge. */ 2223dec214d0STahsin Erdogan if (error) 2224a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, ea_inode, 2225dec214d0STahsin Erdogan i_size_read(ea_inode)); 2226dec214d0STahsin Erdogan iput(ea_inode); 2227dec214d0STahsin Erdogan } 2228ac27a0ecSDave Kleikamp if (ce) 222947387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2230ac27a0ecSDave Kleikamp brelse(new_bh); 2231ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 2232ac27a0ecSDave Kleikamp kfree(s->base); 2233ac27a0ecSDave Kleikamp 2234ac27a0ecSDave Kleikamp return error; 2235ac27a0ecSDave Kleikamp 2236ac27a0ecSDave Kleikamp cleanup_dquot: 22371231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 2238ac27a0ecSDave Kleikamp goto cleanup; 2239ac27a0ecSDave Kleikamp 2240ac27a0ecSDave Kleikamp bad_block: 224124676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 224224676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2243ac27a0ecSDave Kleikamp goto cleanup; 2244ac27a0ecSDave Kleikamp 2245ac27a0ecSDave Kleikamp #undef header 2246ac27a0ecSDave Kleikamp } 2247ac27a0ecSDave Kleikamp 2248879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 2249617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2250ac27a0ecSDave Kleikamp { 2251617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2252617ba13bSMingming Cao struct ext4_inode *raw_inode; 2253ac27a0ecSDave Kleikamp int error; 2254ac27a0ecSDave Kleikamp 225567d7d8adSBaokun Li if (!EXT4_INODE_HAS_XATTR_SPACE(inode)) 2256ac27a0ecSDave Kleikamp return 0; 225767d7d8adSBaokun Li 2258617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 2259ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 2260ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 2261ac27a0ecSDave Kleikamp is->s.here = is->s.first; 2262617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 226319f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 22649e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 2265ac27a0ecSDave Kleikamp if (error) 2266ac27a0ecSDave Kleikamp return error; 2267ac27a0ecSDave Kleikamp /* Find the named attribute. */ 22689496005dSTheodore Ts'o error = xattr_find_entry(inode, &is->s.here, is->s.end, 22699496005dSTheodore Ts'o i->name_index, i->name, 0); 2270ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 2271ac27a0ecSDave Kleikamp return error; 2272ac27a0ecSDave Kleikamp is->s.not_found = error; 2273ac27a0ecSDave Kleikamp } 2274ac27a0ecSDave Kleikamp return 0; 2275ac27a0ecSDave Kleikamp } 2276ac27a0ecSDave Kleikamp 2277310c097cSRitesh Harjani int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 2278617ba13bSMingming Cao struct ext4_xattr_info *i, 2279617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2280ac27a0ecSDave Kleikamp { 2281617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2282617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 2283ac27a0ecSDave Kleikamp int error; 2284ac27a0ecSDave Kleikamp 228567d7d8adSBaokun Li if (!EXT4_INODE_HAS_XATTR_SPACE(inode)) 2286ac27a0ecSDave Kleikamp return -ENOSPC; 228767d7d8adSBaokun Li 2288daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 2289ac27a0ecSDave Kleikamp if (error) 2290ac27a0ecSDave Kleikamp return error; 2291617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 2292ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 2293617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 229419f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 2295ac27a0ecSDave Kleikamp } else { 2296ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 229719f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 2298ac27a0ecSDave Kleikamp } 2299ac27a0ecSDave Kleikamp return 0; 2300ac27a0ecSDave Kleikamp } 2301ac27a0ecSDave Kleikamp 23023fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 23033fd16462SJan Kara struct ext4_xattr_info *i) 23043fd16462SJan Kara { 23053fd16462SJan Kara void *value; 23063fd16462SJan Kara 23070bd454c0STahsin Erdogan /* When e_value_inum is set the value is stored externally. */ 23080bd454c0STahsin Erdogan if (s->here->e_value_inum) 23090bd454c0STahsin Erdogan return 0; 23103fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 23113fd16462SJan Kara return 0; 23123fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 23133fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 23143fd16462SJan Kara } 23153fd16462SJan Kara 2316dec214d0STahsin Erdogan static struct buffer_head *ext4_xattr_get_block(struct inode *inode) 2317dec214d0STahsin Erdogan { 2318dec214d0STahsin Erdogan struct buffer_head *bh; 2319dec214d0STahsin Erdogan int error; 2320dec214d0STahsin Erdogan 2321dec214d0STahsin Erdogan if (!EXT4_I(inode)->i_file_acl) 2322dec214d0STahsin Erdogan return NULL; 2323fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2324fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 2325fb265c9cSTheodore Ts'o return bh; 2326dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2327ecaaf408SVasily Averin if (error) { 2328ecaaf408SVasily Averin brelse(bh); 2329dec214d0STahsin Erdogan return ERR_PTR(error); 2330ecaaf408SVasily Averin } 2331dec214d0STahsin Erdogan return bh; 2332dec214d0STahsin Erdogan } 2333dec214d0STahsin Erdogan 2334ac27a0ecSDave Kleikamp /* 2335617ba13bSMingming Cao * ext4_xattr_set_handle() 2336ac27a0ecSDave Kleikamp * 23376e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 2338ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 2339ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 2340ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 2341ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 2342ac27a0ecSDave Kleikamp * previous to the call, respectively. 2343ac27a0ecSDave Kleikamp * 2344ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2345ac27a0ecSDave Kleikamp */ 2346ac27a0ecSDave Kleikamp int 2347617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 2348ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 2349ac27a0ecSDave Kleikamp int flags) 2350ac27a0ecSDave Kleikamp { 2351617ba13bSMingming Cao struct ext4_xattr_info i = { 2352ac27a0ecSDave Kleikamp .name_index = name_index, 2353ac27a0ecSDave Kleikamp .name = name, 2354ac27a0ecSDave Kleikamp .value = value, 2355ac27a0ecSDave Kleikamp .value_len = value_len, 2356e50e5129SAndreas Dilger .in_inode = 0, 2357ac27a0ecSDave Kleikamp }; 2358617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 2359ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2360ac27a0ecSDave Kleikamp }; 2361617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 2362ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2363ac27a0ecSDave Kleikamp }; 2364c755e251STheodore Ts'o int no_expand; 2365ac27a0ecSDave Kleikamp int error; 2366ac27a0ecSDave Kleikamp 2367ac27a0ecSDave Kleikamp if (!name) 2368ac27a0ecSDave Kleikamp return -EINVAL; 2369ac27a0ecSDave Kleikamp if (strlen(name) > 255) 2370ac27a0ecSDave Kleikamp return -ERANGE; 2371b8cb5a54STahsin Erdogan 2372c755e251STheodore Ts'o ext4_write_lock_xattr(inode, &no_expand); 23734d20c685SKalpak Shah 2374c1a5d5f6STahsin Erdogan /* Check journal credits under write lock. */ 2375c1a5d5f6STahsin Erdogan if (ext4_handle_valid(handle)) { 2376dec214d0STahsin Erdogan struct buffer_head *bh; 2377c1a5d5f6STahsin Erdogan int credits; 2378c1a5d5f6STahsin Erdogan 2379dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2380dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2381dec214d0STahsin Erdogan error = PTR_ERR(bh); 2382dec214d0STahsin Erdogan goto cleanup; 2383dec214d0STahsin Erdogan } 2384dec214d0STahsin Erdogan 2385af65207cSTahsin Erdogan credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2386af65207cSTahsin Erdogan value_len, 2387af65207cSTahsin Erdogan flags & XATTR_CREATE); 2388dec214d0STahsin Erdogan brelse(bh); 2389dec214d0STahsin Erdogan 2390a9a8344eSJan Kara if (jbd2_handle_buffer_credits(handle) < credits) { 2391c1a5d5f6STahsin Erdogan error = -ENOSPC; 2392c1a5d5f6STahsin Erdogan goto cleanup; 2393c1a5d5f6STahsin Erdogan } 2394163f0ec1SJan Kara WARN_ON_ONCE(!(current->flags & PF_MEMALLOC_NOFS)); 2395c1a5d5f6STahsin Erdogan } 2396c1a5d5f6STahsin Erdogan 239766543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 239886ebfd08SEric Sandeen if (error) 239986ebfd08SEric Sandeen goto cleanup; 240086ebfd08SEric Sandeen 240119f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 2402617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 2403617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 240419f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 2405ac27a0ecSDave Kleikamp } 2406ac27a0ecSDave Kleikamp 2407617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 2408ac27a0ecSDave Kleikamp if (error) 2409ac27a0ecSDave Kleikamp goto cleanup; 2410ac27a0ecSDave Kleikamp if (is.s.not_found) 2411617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 2412ac27a0ecSDave Kleikamp if (error) 2413ac27a0ecSDave Kleikamp goto cleanup; 2414ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 2415ac27a0ecSDave Kleikamp error = -ENODATA; 2416ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 2417ac27a0ecSDave Kleikamp goto cleanup; 2418ac27a0ecSDave Kleikamp error = 0; 2419ac27a0ecSDave Kleikamp if (!value) 2420ac27a0ecSDave Kleikamp goto cleanup; 2421ac27a0ecSDave Kleikamp } else { 2422ac27a0ecSDave Kleikamp error = -EEXIST; 2423ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 2424ac27a0ecSDave Kleikamp goto cleanup; 2425ac27a0ecSDave Kleikamp } 2426dec214d0STahsin Erdogan 2427ac27a0ecSDave Kleikamp if (!value) { 2428ac27a0ecSDave Kleikamp if (!is.s.not_found) 2429e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2430ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 2431617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2432ac27a0ecSDave Kleikamp } else { 24333fd16462SJan Kara error = 0; 24343fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 24353fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 24363fd16462SJan Kara goto cleanup; 24373fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 24383fd16462SJan Kara goto cleanup; 24393fd16462SJan Kara 2440b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2441b347e2bcSTahsin Erdogan (EXT4_XATTR_SIZE(i.value_len) > 2442b347e2bcSTahsin Erdogan EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) 2443b347e2bcSTahsin Erdogan i.in_inode = 1; 2444b347e2bcSTahsin Erdogan retry_inode: 2445e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2446ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 2447ac27a0ecSDave Kleikamp i.value = NULL; 2448617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2449ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 24507e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 245145ae932dSVasily Averin brelse(bs.bh); 245245ae932dSVasily Averin bs.bh = NULL; 24537e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 24547e01c8e5STiger Yang if (error) 24557e01c8e5STiger Yang goto cleanup; 24567e01c8e5STiger Yang } 2457617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2458b347e2bcSTahsin Erdogan if (!error && !is.s.not_found) { 2459ac27a0ecSDave Kleikamp i.value = NULL; 2460e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, 2461e50e5129SAndreas Dilger &is); 2462b347e2bcSTahsin Erdogan } else if (error == -ENOSPC) { 2463b347e2bcSTahsin Erdogan /* 2464b347e2bcSTahsin Erdogan * Xattr does not fit in the block, store at 2465b347e2bcSTahsin Erdogan * external inode if possible. 2466b347e2bcSTahsin Erdogan */ 2467b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 24686b224899Szhangyi (F) i.value_len && !i.in_inode) { 2469b347e2bcSTahsin Erdogan i.in_inode = 1; 2470b347e2bcSTahsin Erdogan goto retry_inode; 2471b347e2bcSTahsin Erdogan } 2472ac27a0ecSDave Kleikamp } 2473ac27a0ecSDave Kleikamp } 2474ac27a0ecSDave Kleikamp } 2475ac27a0ecSDave Kleikamp if (!error) { 2476617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 2477eeca7ea1SDeepa Dinamani inode->i_ctime = current_time(inode); 2478a642c2c0SJeff Layton inode_inc_iversion(inode); 24796dd4ee7cSKalpak Shah if (!value) 2480c755e251STheodore Ts'o no_expand = 0; 2481617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 2482ac27a0ecSDave Kleikamp /* 2483617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 2484ac27a0ecSDave Kleikamp * error != 0. 2485ac27a0ecSDave Kleikamp */ 2486ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 2487ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 24880390131bSFrank Mayhar ext4_handle_sync(handle); 2489ac27a0ecSDave Kleikamp } 2490e85c81baSXin Yin ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, handle); 2491ac27a0ecSDave Kleikamp 2492ac27a0ecSDave Kleikamp cleanup: 2493ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 2494ac27a0ecSDave Kleikamp brelse(bs.bh); 2495c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 2496ac27a0ecSDave Kleikamp return error; 2497ac27a0ecSDave Kleikamp } 2498ac27a0ecSDave Kleikamp 2499af65207cSTahsin Erdogan int ext4_xattr_set_credits(struct inode *inode, size_t value_len, 2500af65207cSTahsin Erdogan bool is_create, int *credits) 2501c1a5d5f6STahsin Erdogan { 2502dec214d0STahsin Erdogan struct buffer_head *bh; 2503dec214d0STahsin Erdogan int err; 2504c1a5d5f6STahsin Erdogan 2505dec214d0STahsin Erdogan *credits = 0; 2506dec214d0STahsin Erdogan 2507dec214d0STahsin Erdogan if (!EXT4_SB(inode->i_sb)->s_journal) 2508c1a5d5f6STahsin Erdogan return 0; 2509c1a5d5f6STahsin Erdogan 2510dec214d0STahsin Erdogan down_read(&EXT4_I(inode)->xattr_sem); 2511c1a5d5f6STahsin Erdogan 2512dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2513dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2514dec214d0STahsin Erdogan err = PTR_ERR(bh); 2515dec214d0STahsin Erdogan } else { 2516af65207cSTahsin Erdogan *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2517af65207cSTahsin Erdogan value_len, is_create); 2518dec214d0STahsin Erdogan brelse(bh); 2519dec214d0STahsin Erdogan err = 0; 2520c1a5d5f6STahsin Erdogan } 2521dec214d0STahsin Erdogan 2522dec214d0STahsin Erdogan up_read(&EXT4_I(inode)->xattr_sem); 2523dec214d0STahsin Erdogan return err; 2524c1a5d5f6STahsin Erdogan } 2525c1a5d5f6STahsin Erdogan 2526ac27a0ecSDave Kleikamp /* 2527617ba13bSMingming Cao * ext4_xattr_set() 2528ac27a0ecSDave Kleikamp * 2529617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 2530ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 2531ac27a0ecSDave Kleikamp * 2532ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2533ac27a0ecSDave Kleikamp */ 2534ac27a0ecSDave Kleikamp int 2535617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 2536ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 2537ac27a0ecSDave Kleikamp { 2538ac27a0ecSDave Kleikamp handle_t *handle; 2539e50e5129SAndreas Dilger struct super_block *sb = inode->i_sb; 2540ac27a0ecSDave Kleikamp int error, retries = 0; 2541c1a5d5f6STahsin Erdogan int credits; 2542ac27a0ecSDave Kleikamp 2543b8cb5a54STahsin Erdogan error = dquot_initialize(inode); 2544b8cb5a54STahsin Erdogan if (error) 2545b8cb5a54STahsin Erdogan return error; 2546e50e5129SAndreas Dilger 2547ac27a0ecSDave Kleikamp retry: 2548af65207cSTahsin Erdogan error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, 2549af65207cSTahsin Erdogan &credits); 2550dec214d0STahsin Erdogan if (error) 2551dec214d0STahsin Erdogan return error; 2552dec214d0STahsin Erdogan 25539924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 2554ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 2555ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 2556ac27a0ecSDave Kleikamp } else { 2557ac27a0ecSDave Kleikamp int error2; 2558ac27a0ecSDave Kleikamp 2559617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 2560ac27a0ecSDave Kleikamp value, value_len, flags); 2561617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 2562ac27a0ecSDave Kleikamp if (error == -ENOSPC && 2563e50e5129SAndreas Dilger ext4_should_retry_alloc(sb, &retries)) 2564ac27a0ecSDave Kleikamp goto retry; 2565ac27a0ecSDave Kleikamp if (error == 0) 2566ac27a0ecSDave Kleikamp error = error2; 2567ac27a0ecSDave Kleikamp } 2568e85c81baSXin Yin ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, NULL); 2569ac27a0ecSDave Kleikamp 2570ac27a0ecSDave Kleikamp return error; 2571ac27a0ecSDave Kleikamp } 2572ac27a0ecSDave Kleikamp 2573ac27a0ecSDave Kleikamp /* 25746dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 25756dd4ee7cSKalpak Shah * i_extra_isize. 25766dd4ee7cSKalpak Shah */ 25776dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 25786dd4ee7cSKalpak Shah int value_offs_shift, void *to, 257994405713SJan Kara void *from, size_t n) 25806dd4ee7cSKalpak Shah { 25816dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 25826dd4ee7cSKalpak Shah int new_offs; 25836dd4ee7cSKalpak Shah 258494405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 258594405713SJan Kara BUG_ON(value_offs_shift > 0); 258694405713SJan Kara 25876dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 25886dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 2589e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 25906dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 25916dd4ee7cSKalpak Shah value_offs_shift; 25926dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 25936dd4ee7cSKalpak Shah } 25946dd4ee7cSKalpak Shah } 25956dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 25966dd4ee7cSKalpak Shah memmove(to, from, n); 25976dd4ee7cSKalpak Shah } 25986dd4ee7cSKalpak Shah 25996dd4ee7cSKalpak Shah /* 26003f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 26013f2571c1SJan Kara */ 26023f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 26033f2571c1SJan Kara struct ext4_inode *raw_inode, 26043f2571c1SJan Kara struct ext4_xattr_entry *entry) 26053f2571c1SJan Kara { 26063f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 26073f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 26083f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 2609f6109100STahsin Erdogan size_t value_size = le32_to_cpu(entry->e_value_size); 26103f2571c1SJan Kara struct ext4_xattr_info i = { 26113f2571c1SJan Kara .value = NULL, 26123f2571c1SJan Kara .value_len = 0, 26133f2571c1SJan Kara .name_index = entry->e_name_index, 2614f6109100STahsin Erdogan .in_inode = !!entry->e_value_inum, 26153f2571c1SJan Kara }; 26163f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 26173f2571c1SJan Kara int error; 26183f2571c1SJan Kara 26193f2571c1SJan Kara is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 26203f2571c1SJan Kara bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 26213f2571c1SJan Kara b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 26221e9d62d2SJun Nie if (!is || !bs || !b_entry_name) { 26233f2571c1SJan Kara error = -ENOMEM; 26243f2571c1SJan Kara goto out; 26253f2571c1SJan Kara } 26263f2571c1SJan Kara 26273f2571c1SJan Kara is->s.not_found = -ENODATA; 26283f2571c1SJan Kara bs->s.not_found = -ENODATA; 26293f2571c1SJan Kara is->iloc.bh = NULL; 26303f2571c1SJan Kara bs->bh = NULL; 26313f2571c1SJan Kara 26323f2571c1SJan Kara /* Save the entry name and the entry value */ 2633f6109100STahsin Erdogan if (entry->e_value_inum) { 26341e9d62d2SJun Nie buffer = kvmalloc(value_size, GFP_NOFS); 26351e9d62d2SJun Nie if (!buffer) { 26361e9d62d2SJun Nie error = -ENOMEM; 26371e9d62d2SJun Nie goto out; 26381e9d62d2SJun Nie } 26391e9d62d2SJun Nie 2640b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, value_size); 2641f6109100STahsin Erdogan if (error) 2642f6109100STahsin Erdogan goto out; 2643f6109100STahsin Erdogan } else { 2644f6109100STahsin Erdogan size_t value_offs = le16_to_cpu(entry->e_value_offs); 26451e9d62d2SJun Nie buffer = (void *)IFIRST(header) + value_offs; 2646f6109100STahsin Erdogan } 2647f6109100STahsin Erdogan 26483f2571c1SJan Kara memcpy(b_entry_name, entry->e_name, entry->e_name_len); 26493f2571c1SJan Kara b_entry_name[entry->e_name_len] = '\0'; 26503f2571c1SJan Kara i.name = b_entry_name; 26513f2571c1SJan Kara 26523f2571c1SJan Kara error = ext4_get_inode_loc(inode, &is->iloc); 26533f2571c1SJan Kara if (error) 26543f2571c1SJan Kara goto out; 26553f2571c1SJan Kara 26563f2571c1SJan Kara error = ext4_xattr_ibody_find(inode, &i, is); 26573f2571c1SJan Kara if (error) 26583f2571c1SJan Kara goto out; 26593f2571c1SJan Kara 26603f2571c1SJan Kara i.value = buffer; 26613f2571c1SJan Kara i.value_len = value_size; 26623f2571c1SJan Kara error = ext4_xattr_block_find(inode, &i, bs); 26633f2571c1SJan Kara if (error) 26643f2571c1SJan Kara goto out; 26653f2571c1SJan Kara 26661e9d62d2SJun Nie /* Move ea entry from the inode into the block */ 26673f2571c1SJan Kara error = ext4_xattr_block_set(handle, inode, &i, bs); 26683f2571c1SJan Kara if (error) 26693f2571c1SJan Kara goto out; 26701e9d62d2SJun Nie 26711e9d62d2SJun Nie /* Remove the chosen entry from the inode */ 26721e9d62d2SJun Nie i.value = NULL; 26731e9d62d2SJun Nie i.value_len = 0; 26741e9d62d2SJun Nie error = ext4_xattr_ibody_set(handle, inode, &i, is); 26751e9d62d2SJun Nie 26763f2571c1SJan Kara out: 26773f2571c1SJan Kara kfree(b_entry_name); 26781e9d62d2SJun Nie if (entry->e_value_inum && buffer) 2679cc12a6f2SYe Bin kvfree(buffer); 26803f2571c1SJan Kara if (is) 26813f2571c1SJan Kara brelse(is->iloc.bh); 26826bdc9977SVasily Averin if (bs) 26836bdc9977SVasily Averin brelse(bs->bh); 26843f2571c1SJan Kara kfree(is); 26853f2571c1SJan Kara kfree(bs); 26863f2571c1SJan Kara 26873f2571c1SJan Kara return error; 26883f2571c1SJan Kara } 26893f2571c1SJan Kara 2690dfa2064bSJan Kara static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, 2691dfa2064bSJan Kara struct ext4_inode *raw_inode, 2692dfa2064bSJan Kara int isize_diff, size_t ifree, 2693dfa2064bSJan Kara size_t bfree, int *total_ino) 2694dfa2064bSJan Kara { 2695dfa2064bSJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 2696dfa2064bSJan Kara struct ext4_xattr_entry *small_entry; 2697dfa2064bSJan Kara struct ext4_xattr_entry *entry; 2698dfa2064bSJan Kara struct ext4_xattr_entry *last; 2699dfa2064bSJan Kara unsigned int entry_size; /* EA entry size */ 2700dfa2064bSJan Kara unsigned int total_size; /* EA entry size + value size */ 2701dfa2064bSJan Kara unsigned int min_total_size; 2702dfa2064bSJan Kara int error; 2703dfa2064bSJan Kara 2704dfa2064bSJan Kara while (isize_diff > ifree) { 2705dfa2064bSJan Kara entry = NULL; 2706dfa2064bSJan Kara small_entry = NULL; 2707dfa2064bSJan Kara min_total_size = ~0U; 2708dfa2064bSJan Kara last = IFIRST(header); 2709dfa2064bSJan Kara /* Find the entry best suited to be pushed into EA block */ 2710dfa2064bSJan Kara for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 27118cdb5240STheodore Ts'o /* never move system.data out of the inode */ 27128cdb5240STheodore Ts'o if ((last->e_name_len == 4) && 27138cdb5240STheodore Ts'o (last->e_name_index == EXT4_XATTR_INDEX_SYSTEM) && 27148cdb5240STheodore Ts'o !memcmp(last->e_name, "data", 4)) 27158cdb5240STheodore Ts'o continue; 27169bb21cedSTahsin Erdogan total_size = EXT4_XATTR_LEN(last->e_name_len); 27179bb21cedSTahsin Erdogan if (!last->e_value_inum) 27189bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 27199bb21cedSTahsin Erdogan le32_to_cpu(last->e_value_size)); 2720dfa2064bSJan Kara if (total_size <= bfree && 2721dfa2064bSJan Kara total_size < min_total_size) { 2722dfa2064bSJan Kara if (total_size + ifree < isize_diff) { 2723dfa2064bSJan Kara small_entry = last; 2724dfa2064bSJan Kara } else { 2725dfa2064bSJan Kara entry = last; 2726dfa2064bSJan Kara min_total_size = total_size; 2727dfa2064bSJan Kara } 2728dfa2064bSJan Kara } 2729dfa2064bSJan Kara } 2730dfa2064bSJan Kara 2731dfa2064bSJan Kara if (entry == NULL) { 2732dfa2064bSJan Kara if (small_entry == NULL) 2733dfa2064bSJan Kara return -ENOSPC; 2734dfa2064bSJan Kara entry = small_entry; 2735dfa2064bSJan Kara } 2736dfa2064bSJan Kara 2737dfa2064bSJan Kara entry_size = EXT4_XATTR_LEN(entry->e_name_len); 27389bb21cedSTahsin Erdogan total_size = entry_size; 27399bb21cedSTahsin Erdogan if (!entry->e_value_inum) 27409bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 27419bb21cedSTahsin Erdogan le32_to_cpu(entry->e_value_size)); 2742dfa2064bSJan Kara error = ext4_xattr_move_to_block(handle, inode, raw_inode, 2743dfa2064bSJan Kara entry); 2744dfa2064bSJan Kara if (error) 2745dfa2064bSJan Kara return error; 2746dfa2064bSJan Kara 2747dfa2064bSJan Kara *total_ino -= entry_size; 2748dfa2064bSJan Kara ifree += total_size; 2749dfa2064bSJan Kara bfree -= total_size; 2750dfa2064bSJan Kara } 2751dfa2064bSJan Kara 2752dfa2064bSJan Kara return 0; 2753dfa2064bSJan Kara } 2754dfa2064bSJan Kara 27553f2571c1SJan Kara /* 27566dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 27576dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 27586dd4ee7cSKalpak Shah */ 27596dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 27606dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 27616dd4ee7cSKalpak Shah { 27626dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 2763cf0a5e81SMiao Xie struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 2764cf0a5e81SMiao Xie static unsigned int mnt_count; 2765e3014d14SJan Kara size_t min_offs; 2766e3014d14SJan Kara size_t ifree, bfree; 27677b1b2c1bSTheodore Ts'o int total_ino; 27686e0cd088SJan Kara void *base, *end; 2769d0141191SJan Kara int error = 0, tried_min_extra_isize = 0; 2770cf0a5e81SMiao Xie int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); 2771d0141191SJan Kara int isize_diff; /* How much do we need to grow i_extra_isize */ 2772c755e251STheodore Ts'o 27736dd4ee7cSKalpak Shah retry: 2774d0141191SJan Kara isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; 27752e81a4eeSJan Kara if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) 2776b640b2c5SMiao Xie return 0; 27776dd4ee7cSKalpak Shah 27786dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 27796dd4ee7cSKalpak Shah 27806dd4ee7cSKalpak Shah /* 27816dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 27826dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 27836dd4ee7cSKalpak Shah */ 27846dd4ee7cSKalpak Shah 27856e0cd088SJan Kara base = IFIRST(header); 27866dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 27876dd4ee7cSKalpak Shah min_offs = end - base; 2788a805622aSTheodore Ts'o total_ino = sizeof(struct ext4_xattr_ibody_header) + sizeof(u32); 27896dd4ee7cSKalpak Shah 27909e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 27919e92f48cSTheodore Ts'o if (error) 27929e92f48cSTheodore Ts'o goto cleanup; 27939e92f48cSTheodore Ts'o 27946e0cd088SJan Kara ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); 2795e3014d14SJan Kara if (ifree >= isize_diff) 2796e3014d14SJan Kara goto shift; 27976dd4ee7cSKalpak Shah 27986dd4ee7cSKalpak Shah /* 27996dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 28006dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 28016dd4ee7cSKalpak Shah */ 28026dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 280353692ec0SVasily Averin struct buffer_head *bh; 280453692ec0SVasily Averin 2805fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2806fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 2807fb265c9cSTheodore Ts'o error = PTR_ERR(bh); 28086dd4ee7cSKalpak Shah goto cleanup; 2809fb265c9cSTheodore Ts'o } 2810de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 281153692ec0SVasily Averin if (error) { 281253692ec0SVasily Averin brelse(bh); 28136dd4ee7cSKalpak Shah goto cleanup; 281453692ec0SVasily Averin } 28156dd4ee7cSKalpak Shah base = BHDR(bh); 28166dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 28176dd4ee7cSKalpak Shah min_offs = end - base; 28186e0cd088SJan Kara bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, 28196e0cd088SJan Kara NULL); 2820b640b2c5SMiao Xie brelse(bh); 2821e3014d14SJan Kara if (bfree + ifree < isize_diff) { 28226dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 28236dd4ee7cSKalpak Shah tried_min_extra_isize++; 28246dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 28256dd4ee7cSKalpak Shah goto retry; 28266dd4ee7cSKalpak Shah } 2827dfa2064bSJan Kara error = -ENOSPC; 28286dd4ee7cSKalpak Shah goto cleanup; 28296dd4ee7cSKalpak Shah } 28306dd4ee7cSKalpak Shah } else { 2831e3014d14SJan Kara bfree = inode->i_sb->s_blocksize; 28326dd4ee7cSKalpak Shah } 28336dd4ee7cSKalpak Shah 2834dfa2064bSJan Kara error = ext4_xattr_make_inode_space(handle, inode, raw_inode, 2835dfa2064bSJan Kara isize_diff, ifree, bfree, 2836dfa2064bSJan Kara &total_ino); 2837dfa2064bSJan Kara if (error) { 2838dfa2064bSJan Kara if (error == -ENOSPC && !tried_min_extra_isize && 28396dd4ee7cSKalpak Shah s_min_extra_isize) { 28406dd4ee7cSKalpak Shah tried_min_extra_isize++; 28416dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 28426dd4ee7cSKalpak Shah goto retry; 28436dd4ee7cSKalpak Shah } 28446dd4ee7cSKalpak Shah goto cleanup; 28456dd4ee7cSKalpak Shah } 2846e3014d14SJan Kara shift: 2847e3014d14SJan Kara /* Adjust the offsets and shift the remaining entries ahead */ 28486e0cd088SJan Kara ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize 2849e3014d14SJan Kara - new_extra_isize, (void *)raw_inode + 2850e3014d14SJan Kara EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 285194405713SJan Kara (void *)header, total_ino); 2852e3014d14SJan Kara EXT4_I(inode)->i_extra_isize = new_extra_isize; 28536dd4ee7cSKalpak Shah 28546dd4ee7cSKalpak Shah cleanup: 2855b640b2c5SMiao Xie if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) { 2856cf0a5e81SMiao Xie ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", 2857cf0a5e81SMiao Xie inode->i_ino); 2858cf0a5e81SMiao Xie mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); 2859cf0a5e81SMiao Xie } 28606dd4ee7cSKalpak Shah return error; 28616dd4ee7cSKalpak Shah } 28626dd4ee7cSKalpak Shah 2863e50e5129SAndreas Dilger #define EIA_INCR 16 /* must be 2^n */ 2864e50e5129SAndreas Dilger #define EIA_MASK (EIA_INCR - 1) 2865dec214d0STahsin Erdogan 2866dec214d0STahsin Erdogan /* Add the large xattr @inode into @ea_inode_array for deferred iput(). 28670421a189STahsin Erdogan * If @ea_inode_array is new or full it will be grown and the old 2868e50e5129SAndreas Dilger * contents copied over. 2869e50e5129SAndreas Dilger */ 2870e50e5129SAndreas Dilger static int 28710421a189STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 28720421a189STahsin Erdogan struct inode *inode) 2873e50e5129SAndreas Dilger { 28740421a189STahsin Erdogan if (*ea_inode_array == NULL) { 2875e50e5129SAndreas Dilger /* 2876e50e5129SAndreas Dilger * Start with 15 inodes, so it fits into a power-of-two size. 28770421a189STahsin Erdogan * If *ea_inode_array is NULL, this is essentially offsetof() 2878e50e5129SAndreas Dilger */ 28790421a189STahsin Erdogan (*ea_inode_array) = 28800421a189STahsin Erdogan kmalloc(offsetof(struct ext4_xattr_inode_array, 28810421a189STahsin Erdogan inodes[EIA_MASK]), 2882e50e5129SAndreas Dilger GFP_NOFS); 28830421a189STahsin Erdogan if (*ea_inode_array == NULL) 2884e50e5129SAndreas Dilger return -ENOMEM; 28850421a189STahsin Erdogan (*ea_inode_array)->count = 0; 28860421a189STahsin Erdogan } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { 2887e50e5129SAndreas Dilger /* expand the array once all 15 + n * 16 slots are full */ 28880421a189STahsin Erdogan struct ext4_xattr_inode_array *new_array = NULL; 28890421a189STahsin Erdogan int count = (*ea_inode_array)->count; 2890e50e5129SAndreas Dilger 2891e50e5129SAndreas Dilger /* if new_array is NULL, this is essentially offsetof() */ 2892e50e5129SAndreas Dilger new_array = kmalloc( 28930421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, 28940421a189STahsin Erdogan inodes[count + EIA_INCR]), 2895e50e5129SAndreas Dilger GFP_NOFS); 2896e50e5129SAndreas Dilger if (new_array == NULL) 2897e50e5129SAndreas Dilger return -ENOMEM; 28980421a189STahsin Erdogan memcpy(new_array, *ea_inode_array, 28990421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, inodes[count])); 29000421a189STahsin Erdogan kfree(*ea_inode_array); 29010421a189STahsin Erdogan *ea_inode_array = new_array; 2902e50e5129SAndreas Dilger } 29030421a189STahsin Erdogan (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; 2904e50e5129SAndreas Dilger return 0; 2905e50e5129SAndreas Dilger } 2906e50e5129SAndreas Dilger 29076dd4ee7cSKalpak Shah /* 2908617ba13bSMingming Cao * ext4_xattr_delete_inode() 2909ac27a0ecSDave Kleikamp * 2910e50e5129SAndreas Dilger * Free extended attribute resources associated with this inode. Traverse 2911dec214d0STahsin Erdogan * all entries and decrement reference on any xattr inodes associated with this 2912dec214d0STahsin Erdogan * inode. This is called immediately before an inode is freed. We have exclusive 2913dec214d0STahsin Erdogan * access to the inode. If an orphan inode is deleted it will also release its 2914dec214d0STahsin Erdogan * references on xattr block and xattr inodes. 2915ac27a0ecSDave Kleikamp */ 2916dec214d0STahsin Erdogan int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, 291730a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 291830a7eb97STahsin Erdogan int extra_credits) 2919ac27a0ecSDave Kleikamp { 2920ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 2921e50e5129SAndreas Dilger struct ext4_xattr_ibody_header *header; 292230a7eb97STahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 2923dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 2924a6d05676STahsin Erdogan struct inode *ea_inode; 292530a7eb97STahsin Erdogan int error; 292630a7eb97STahsin Erdogan 292783448bdfSJan Kara error = ext4_journal_ensure_credits(handle, extra_credits, 292883448bdfSJan Kara ext4_free_metadata_revoke_credits(inode->i_sb, 1)); 2929a4130367SJan Kara if (error < 0) { 293030a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); 293130a7eb97STahsin Erdogan goto cleanup; 293230a7eb97STahsin Erdogan } 2933ac27a0ecSDave Kleikamp 2934dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2935dec214d0STahsin Erdogan ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 2936e50e5129SAndreas Dilger 2937e50e5129SAndreas Dilger error = ext4_get_inode_loc(inode, &iloc); 2938dec214d0STahsin Erdogan if (error) { 2939dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); 2940e50e5129SAndreas Dilger goto cleanup; 2941e50e5129SAndreas Dilger } 2942dec214d0STahsin Erdogan 2943188c299eSJan Kara error = ext4_journal_get_write_access(handle, inode->i_sb, 2944188c299eSJan Kara iloc.bh, EXT4_JTR_NONE); 2945dec214d0STahsin Erdogan if (error) { 2946dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "write access (error %d)", 2947dec214d0STahsin Erdogan error); 2948dec214d0STahsin Erdogan goto cleanup; 2949dec214d0STahsin Erdogan } 2950dec214d0STahsin Erdogan 2951dec214d0STahsin Erdogan header = IHDR(inode, ext4_raw_inode(&iloc)); 2952dec214d0STahsin Erdogan if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) 2953dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, 2954dec214d0STahsin Erdogan IFIRST(header), 2955dec214d0STahsin Erdogan false /* block_csum */, 2956dec214d0STahsin Erdogan ea_inode_array, 2957dec214d0STahsin Erdogan extra_credits, 2958dec214d0STahsin Erdogan false /* skip_quota */); 2959dec214d0STahsin Erdogan } 2960dec214d0STahsin Erdogan 2961dec214d0STahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 2962fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2963fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 2964fb265c9cSTheodore Ts'o error = PTR_ERR(bh); 2965878520acSTheodore Ts'o if (error == -EIO) { 296654d3adbcSTheodore Ts'o EXT4_ERROR_INODE_ERR(inode, EIO, 296754d3adbcSTheodore Ts'o "block %llu read error", 296824676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2969878520acSTheodore Ts'o } 29707159a986SDan Carpenter bh = NULL; 2971ac27a0ecSDave Kleikamp goto cleanup; 2972ac27a0ecSDave Kleikamp } 2973dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2974de05ca85STheodore Ts'o if (error) 2975ac27a0ecSDave Kleikamp goto cleanup; 2976e50e5129SAndreas Dilger 297730a7eb97STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) { 2978dec214d0STahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 2979a6d05676STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 2980a6d05676STahsin Erdogan if (!entry->e_value_inum) 2981a6d05676STahsin Erdogan continue; 2982a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, 2983a6d05676STahsin Erdogan le32_to_cpu(entry->e_value_inum), 2984a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 2985a6d05676STahsin Erdogan &ea_inode); 2986a6d05676STahsin Erdogan if (error) 2987a6d05676STahsin Erdogan continue; 2988a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, ea_inode, 2989dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 2990a6d05676STahsin Erdogan iput(ea_inode); 2991a6d05676STahsin Erdogan } 2992dec214d0STahsin Erdogan 2993e50e5129SAndreas Dilger } 2994e50e5129SAndreas Dilger 2995dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bh, ea_inode_array, 2996dec214d0STahsin Erdogan extra_credits); 2997dec214d0STahsin Erdogan /* 2998dec214d0STahsin Erdogan * Update i_file_acl value in the same transaction that releases 2999dec214d0STahsin Erdogan * block. 3000dec214d0STahsin Erdogan */ 3001617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 300230a7eb97STahsin Erdogan error = ext4_mark_inode_dirty(handle, inode); 300330a7eb97STahsin Erdogan if (error) { 300430a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", 300530a7eb97STahsin Erdogan error); 300630a7eb97STahsin Erdogan goto cleanup; 300730a7eb97STahsin Erdogan } 3008e85c81baSXin Yin ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, handle); 3009dec214d0STahsin Erdogan } 3010dec214d0STahsin Erdogan error = 0; 3011ac27a0ecSDave Kleikamp cleanup: 301230a7eb97STahsin Erdogan brelse(iloc.bh); 3013ac27a0ecSDave Kleikamp brelse(bh); 3014e50e5129SAndreas Dilger return error; 3015e50e5129SAndreas Dilger } 3016e50e5129SAndreas Dilger 30170421a189STahsin Erdogan void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) 3018e50e5129SAndreas Dilger { 3019dec214d0STahsin Erdogan int idx; 3020e50e5129SAndreas Dilger 30210421a189STahsin Erdogan if (ea_inode_array == NULL) 3022e50e5129SAndreas Dilger return; 3023e50e5129SAndreas Dilger 3024dec214d0STahsin Erdogan for (idx = 0; idx < ea_inode_array->count; ++idx) 3025dec214d0STahsin Erdogan iput(ea_inode_array->inodes[idx]); 30260421a189STahsin Erdogan kfree(ea_inode_array); 3027ac27a0ecSDave Kleikamp } 3028ac27a0ecSDave Kleikamp 3029ac27a0ecSDave Kleikamp /* 303047387409STahsin Erdogan * ext4_xattr_block_cache_insert() 3031ac27a0ecSDave Kleikamp * 303247387409STahsin Erdogan * Create a new entry in the extended attribute block cache, and insert 3033ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 3034ac27a0ecSDave Kleikamp * 3035ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 3036ac27a0ecSDave Kleikamp */ 3037ac27a0ecSDave Kleikamp static void 303847387409STahsin Erdogan ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, 303947387409STahsin Erdogan struct buffer_head *bh) 3040ac27a0ecSDave Kleikamp { 30416048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 30426048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 30436048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 30446048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 3045ac27a0ecSDave Kleikamp int error; 3046ac27a0ecSDave Kleikamp 3047cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 3048cdb7ee4cSTahsin Erdogan return; 304947387409STahsin Erdogan error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, 30506048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 3051ac27a0ecSDave Kleikamp if (error) { 305282939d79SJan Kara if (error == -EBUSY) 3053ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 305482939d79SJan Kara } else 3055ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 3056ac27a0ecSDave Kleikamp } 3057ac27a0ecSDave Kleikamp 3058ac27a0ecSDave Kleikamp /* 3059617ba13bSMingming Cao * ext4_xattr_cmp() 3060ac27a0ecSDave Kleikamp * 3061ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 3062ac27a0ecSDave Kleikamp * 3063ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 3064ac27a0ecSDave Kleikamp * a negative error number on errors. 3065ac27a0ecSDave Kleikamp */ 3066ac27a0ecSDave Kleikamp static int 3067617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 3068617ba13bSMingming Cao struct ext4_xattr_header *header2) 3069ac27a0ecSDave Kleikamp { 3070617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 3071ac27a0ecSDave Kleikamp 3072ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 3073ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 3074ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 3075ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 3076ac27a0ecSDave Kleikamp return 1; 3077ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 3078ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 3079ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 3080ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 3081e50e5129SAndreas Dilger entry1->e_value_inum != entry2->e_value_inum || 3082ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 3083ac27a0ecSDave Kleikamp return 1; 30847cec1918STahsin Erdogan if (!entry1->e_value_inum && 30857cec1918STahsin Erdogan memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 3086ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 3087ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 3088ac27a0ecSDave Kleikamp return 1; 3089ac27a0ecSDave Kleikamp 3090617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 3091617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 3092ac27a0ecSDave Kleikamp } 3093ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 3094ac27a0ecSDave Kleikamp return 1; 3095ac27a0ecSDave Kleikamp return 0; 3096ac27a0ecSDave Kleikamp } 3097ac27a0ecSDave Kleikamp 3098ac27a0ecSDave Kleikamp /* 309947387409STahsin Erdogan * ext4_xattr_block_cache_find() 3100ac27a0ecSDave Kleikamp * 3101ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 3102ac27a0ecSDave Kleikamp * 3103ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 3104ac27a0ecSDave Kleikamp * not found or an error occurred. 3105ac27a0ecSDave Kleikamp */ 3106ac27a0ecSDave Kleikamp static struct buffer_head * 310747387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *inode, 310847387409STahsin Erdogan struct ext4_xattr_header *header, 31097a2508e1SJan Kara struct mb_cache_entry **pce) 3110ac27a0ecSDave Kleikamp { 3111ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 31127a2508e1SJan Kara struct mb_cache_entry *ce; 311347387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 3114ac27a0ecSDave Kleikamp 3115cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 3116cdb7ee4cSTahsin Erdogan return NULL; 3117ac27a0ecSDave Kleikamp if (!header->h_hash) 3118ac27a0ecSDave Kleikamp return NULL; /* never share */ 3119ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 312047387409STahsin Erdogan ce = mb_cache_entry_find_first(ea_block_cache, hash); 3121ac27a0ecSDave Kleikamp while (ce) { 3122ac27a0ecSDave Kleikamp struct buffer_head *bh; 3123ac27a0ecSDave Kleikamp 3124fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, ce->e_value, REQ_PRIO); 3125fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 3126fb265c9cSTheodore Ts'o if (PTR_ERR(bh) == -ENOMEM) 3127fb265c9cSTheodore Ts'o return NULL; 31287159a986SDan Carpenter bh = NULL; 312924676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 3130c07dfcb4STahsin Erdogan (unsigned long)ce->e_value); 3131617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 3132ac27a0ecSDave Kleikamp *pce = ce; 3133ac27a0ecSDave Kleikamp return bh; 3134ac27a0ecSDave Kleikamp } 3135ac27a0ecSDave Kleikamp brelse(bh); 313647387409STahsin Erdogan ce = mb_cache_entry_find_next(ea_block_cache, ce); 3137ac27a0ecSDave Kleikamp } 3138ac27a0ecSDave Kleikamp return NULL; 3139ac27a0ecSDave Kleikamp } 3140ac27a0ecSDave Kleikamp 3141ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 3142ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 3143ac27a0ecSDave Kleikamp 3144ac27a0ecSDave Kleikamp /* 3145617ba13bSMingming Cao * ext4_xattr_hash_entry() 3146ac27a0ecSDave Kleikamp * 3147ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 3148ac27a0ecSDave Kleikamp */ 3149b9fc761eSTahsin Erdogan static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, 3150b9fc761eSTahsin Erdogan size_t value_count) 3151ac27a0ecSDave Kleikamp { 3152ac27a0ecSDave Kleikamp __u32 hash = 0; 3153ac27a0ecSDave Kleikamp 3154b9fc761eSTahsin Erdogan while (name_len--) { 3155ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 3156ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 3157ac27a0ecSDave Kleikamp *name++; 3158ac27a0ecSDave Kleikamp } 3159b9fc761eSTahsin Erdogan while (value_count--) { 3160ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 3161ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 3162ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 3163ac27a0ecSDave Kleikamp } 3164b9fc761eSTahsin Erdogan return cpu_to_le32(hash); 3165ac27a0ecSDave Kleikamp } 3166ac27a0ecSDave Kleikamp 3167f3bbac32SLinus Torvalds /* 3168f3bbac32SLinus Torvalds * ext4_xattr_hash_entry_signed() 3169f3bbac32SLinus Torvalds * 3170f3bbac32SLinus Torvalds * Compute the hash of an extended attribute incorrectly. 3171f3bbac32SLinus Torvalds */ 3172f3bbac32SLinus Torvalds static __le32 ext4_xattr_hash_entry_signed(char *name, size_t name_len, __le32 *value, size_t value_count) 3173f3bbac32SLinus Torvalds { 3174f3bbac32SLinus Torvalds __u32 hash = 0; 3175f3bbac32SLinus Torvalds 3176f3bbac32SLinus Torvalds while (name_len--) { 3177f3bbac32SLinus Torvalds hash = (hash << NAME_HASH_SHIFT) ^ 3178f3bbac32SLinus Torvalds (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 3179f3bbac32SLinus Torvalds (signed char)*name++; 3180f3bbac32SLinus Torvalds } 3181f3bbac32SLinus Torvalds while (value_count--) { 3182f3bbac32SLinus Torvalds hash = (hash << VALUE_HASH_SHIFT) ^ 3183f3bbac32SLinus Torvalds (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 3184f3bbac32SLinus Torvalds le32_to_cpu(*value++); 3185f3bbac32SLinus Torvalds } 3186f3bbac32SLinus Torvalds return cpu_to_le32(hash); 3187f3bbac32SLinus Torvalds } 3188f3bbac32SLinus Torvalds 3189ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 3190ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 3191ac27a0ecSDave Kleikamp 3192ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 3193ac27a0ecSDave Kleikamp 3194ac27a0ecSDave Kleikamp /* 3195617ba13bSMingming Cao * ext4_xattr_rehash() 3196ac27a0ecSDave Kleikamp * 3197ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 3198ac27a0ecSDave Kleikamp */ 3199daf83281STahsin Erdogan static void ext4_xattr_rehash(struct ext4_xattr_header *header) 3200ac27a0ecSDave Kleikamp { 3201617ba13bSMingming Cao struct ext4_xattr_entry *here; 3202ac27a0ecSDave Kleikamp __u32 hash = 0; 3203ac27a0ecSDave Kleikamp 3204ac27a0ecSDave Kleikamp here = ENTRY(header+1); 3205ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 3206ac27a0ecSDave Kleikamp if (!here->e_hash) { 3207ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 3208ac27a0ecSDave Kleikamp hash = 0; 3209ac27a0ecSDave Kleikamp break; 3210ac27a0ecSDave Kleikamp } 3211ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 3212ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 3213ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 3214617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 3215ac27a0ecSDave Kleikamp } 3216ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 3217ac27a0ecSDave Kleikamp } 3218ac27a0ecSDave Kleikamp 3219ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 3220ac27a0ecSDave Kleikamp 32219c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 32229c191f70ST Makphaibulchoke 32237a2508e1SJan Kara struct mb_cache * 322482939d79SJan Kara ext4_xattr_create_cache(void) 3225ac27a0ecSDave Kleikamp { 32267a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 3227ac27a0ecSDave Kleikamp } 3228ac27a0ecSDave Kleikamp 32297a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 3230ac27a0ecSDave Kleikamp { 32319c191f70ST Makphaibulchoke if (cache) 32327a2508e1SJan Kara mb_cache_destroy(cache); 3233ac27a0ecSDave Kleikamp } 32349c191f70ST Makphaibulchoke 3235