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 91d549b741SChristian Brauner [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &nop_posix_acl_access, 92d549b741SChristian Brauner [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &nop_posix_acl_default, 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_SECURITY 105617ba13bSMingming Cao &ext4_xattr_security_handler, 106ac27a0ecSDave Kleikamp #endif 10788ee9d57SJan (janneke) Nieuwenhuizen &ext4_xattr_hurd_handler, 108ac27a0ecSDave Kleikamp NULL 109ac27a0ecSDave Kleikamp }; 110ac27a0ecSDave Kleikamp 11147387409STahsin Erdogan #define EA_BLOCK_CACHE(inode) (((struct ext4_sb_info *) \ 11247387409STahsin Erdogan inode->i_sb->s_fs_info)->s_ea_block_cache) 1139c191f70ST Makphaibulchoke 114dec214d0STahsin Erdogan #define EA_INODE_CACHE(inode) (((struct ext4_sb_info *) \ 115dec214d0STahsin Erdogan inode->i_sb->s_fs_info)->s_ea_inode_cache) 116dec214d0STahsin Erdogan 11730a7eb97STahsin Erdogan static int 11830a7eb97STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 11930a7eb97STahsin Erdogan struct inode *inode); 12030a7eb97STahsin Erdogan 12133d201e0STahsin Erdogan #ifdef CONFIG_LOCKDEP 12233d201e0STahsin Erdogan void ext4_xattr_inode_set_class(struct inode *ea_inode) 12333d201e0STahsin Erdogan { 124aff3bea9STheodore Ts'o struct ext4_inode_info *ei = EXT4_I(ea_inode); 125aff3bea9STheodore Ts'o 12633d201e0STahsin Erdogan lockdep_set_subclass(&ea_inode->i_rwsem, 1); 127aff3bea9STheodore Ts'o (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */ 128aff3bea9STheodore Ts'o lockdep_set_subclass(&ei->i_data_sem, I_DATA_SEM_EA); 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 176a5488f29SChristian Brauner static inline const char *ext4_xattr_prefix(int name_index, 177a5488f29SChristian Brauner struct dentry *dentry) 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]; 183a5488f29SChristian Brauner 184a5488f29SChristian Brauner if (!xattr_handler_can_list(handler, dentry)) 185a5488f29SChristian Brauner return NULL; 186a5488f29SChristian Brauner 187a5488f29SChristian Brauner return xattr_prefix(handler); 188ac27a0ecSDave Kleikamp } 189ac27a0ecSDave Kleikamp 190ac27a0ecSDave Kleikamp static int 1913478c83cSTheodore Ts'o check_xattrs(struct inode *inode, struct buffer_head *bh, 1923478c83cSTheodore Ts'o struct ext4_xattr_entry *entry, void *end, void *value_start, 1933478c83cSTheodore Ts'o const char *function, unsigned int line) 194ac27a0ecSDave Kleikamp { 195a0626e75SDarrick J. Wong struct ext4_xattr_entry *e = entry; 1963478c83cSTheodore Ts'o int err = -EFSCORRUPTED; 1973478c83cSTheodore Ts'o char *err_str; 1983478c83cSTheodore Ts'o 1993478c83cSTheodore Ts'o if (bh) { 2003478c83cSTheodore Ts'o if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 2013478c83cSTheodore Ts'o BHDR(bh)->h_blocks != cpu_to_le32(1)) { 2023478c83cSTheodore Ts'o err_str = "invalid header"; 2033478c83cSTheodore Ts'o goto errout; 2043478c83cSTheodore Ts'o } 2053478c83cSTheodore Ts'o if (buffer_verified(bh)) 2063478c83cSTheodore Ts'o return 0; 2073478c83cSTheodore Ts'o if (!ext4_xattr_block_csum_verify(inode, bh)) { 2083478c83cSTheodore Ts'o err = -EFSBADCRC; 2093478c83cSTheodore Ts'o err_str = "invalid checksum"; 2103478c83cSTheodore Ts'o goto errout; 2113478c83cSTheodore Ts'o } 2123478c83cSTheodore Ts'o } else { 2133478c83cSTheodore Ts'o struct ext4_xattr_ibody_header *header = value_start; 2143478c83cSTheodore Ts'o 2153478c83cSTheodore Ts'o header -= 1; 2163478c83cSTheodore Ts'o if (end - (void *)header < sizeof(*header) + sizeof(u32)) { 2173478c83cSTheodore Ts'o err_str = "in-inode xattr block too small"; 2183478c83cSTheodore Ts'o goto errout; 2193478c83cSTheodore Ts'o } 2203478c83cSTheodore Ts'o if (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC)) { 2213478c83cSTheodore Ts'o err_str = "bad magic number in in-inode xattr"; 2223478c83cSTheodore Ts'o goto errout; 2233478c83cSTheodore Ts'o } 2243478c83cSTheodore Ts'o } 225a0626e75SDarrick J. Wong 226d7614cc1SEric Biggers /* Find the end of the names list */ 227a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(e)) { 228a0626e75SDarrick J. Wong struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); 2293478c83cSTheodore Ts'o if ((void *)next >= end) { 2303478c83cSTheodore Ts'o err_str = "e_name out of bounds"; 2313478c83cSTheodore Ts'o goto errout; 2323478c83cSTheodore Ts'o } 2333478c83cSTheodore Ts'o if (strnlen(e->e_name, e->e_name_len) != e->e_name_len) { 2343478c83cSTheodore Ts'o err_str = "bad e_name length"; 2353478c83cSTheodore Ts'o goto errout; 2363478c83cSTheodore Ts'o } 237a0626e75SDarrick J. Wong e = next; 238ac27a0ecSDave Kleikamp } 239a0626e75SDarrick J. Wong 240d7614cc1SEric Biggers /* Check the values */ 241a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(entry)) { 242d7614cc1SEric Biggers u32 size = le32_to_cpu(entry->e_value_size); 2433478c83cSTheodore Ts'o unsigned long ea_ino = le32_to_cpu(entry->e_value_inum); 244ce3fd194SEric Biggers 2453478c83cSTheodore Ts'o if (!ext4_has_feature_ea_inode(inode->i_sb) && ea_ino) { 2463478c83cSTheodore Ts'o err_str = "ea_inode specified without ea_inode feature enabled"; 2473478c83cSTheodore Ts'o goto errout; 2483478c83cSTheodore Ts'o } 2493478c83cSTheodore Ts'o if (ea_ino && ((ea_ino == EXT4_ROOT_INO) || 2503478c83cSTheodore Ts'o !ext4_valid_inum(inode->i_sb, ea_ino))) { 2513478c83cSTheodore Ts'o err_str = "invalid ea_ino"; 2523478c83cSTheodore Ts'o goto errout; 2533478c83cSTheodore Ts'o } 2543478c83cSTheodore Ts'o if (size > EXT4_XATTR_SIZE_MAX) { 2553478c83cSTheodore Ts'o err_str = "e_value size too large"; 2563478c83cSTheodore Ts'o goto errout; 2573478c83cSTheodore Ts'o } 258ce3fd194SEric Biggers 259ce3fd194SEric Biggers if (size != 0 && entry->e_value_inum == 0) { 260ce3fd194SEric Biggers u16 offs = le16_to_cpu(entry->e_value_offs); 261d7614cc1SEric Biggers void *value; 262d7614cc1SEric Biggers 263d7614cc1SEric Biggers /* 264d7614cc1SEric Biggers * The value cannot overlap the names, and the value 265d7614cc1SEric Biggers * with padding cannot extend beyond 'end'. Check both 266d7614cc1SEric Biggers * the padded and unpadded sizes, since the size may 267d7614cc1SEric Biggers * overflow to 0 when adding padding. 268d7614cc1SEric Biggers */ 2693478c83cSTheodore Ts'o if (offs > end - value_start) { 2703478c83cSTheodore Ts'o err_str = "e_value out of bounds"; 2713478c83cSTheodore Ts'o goto errout; 2723478c83cSTheodore Ts'o } 273d7614cc1SEric Biggers value = value_start + offs; 274d7614cc1SEric Biggers if (value < (void *)e + sizeof(u32) || 275d7614cc1SEric Biggers size > end - value || 2763478c83cSTheodore Ts'o EXT4_XATTR_SIZE(size) > end - value) { 2773478c83cSTheodore Ts'o err_str = "overlapping e_value "; 2783478c83cSTheodore Ts'o goto errout; 2793478c83cSTheodore Ts'o } 280d7614cc1SEric Biggers } 281a0626e75SDarrick J. Wong entry = EXT4_XATTR_NEXT(entry); 282a0626e75SDarrick J. Wong } 2833478c83cSTheodore Ts'o if (bh) 2843478c83cSTheodore Ts'o set_buffer_verified(bh); 285ac27a0ecSDave Kleikamp return 0; 2863478c83cSTheodore Ts'o 2873478c83cSTheodore Ts'o errout: 2883478c83cSTheodore Ts'o if (bh) 2893478c83cSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, -err, 2903478c83cSTheodore Ts'o "corrupted xattr block %llu: %s", 2913478c83cSTheodore Ts'o (unsigned long long) bh->b_blocknr, 2923478c83cSTheodore Ts'o err_str); 2933478c83cSTheodore Ts'o else 2943478c83cSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, -err, 2953478c83cSTheodore Ts'o "corrupted in-inode xattr: %s", err_str); 2963478c83cSTheodore Ts'o return err; 297ac27a0ecSDave Kleikamp } 298ac27a0ecSDave Kleikamp 299ac27a0ecSDave Kleikamp static inline int 300de05ca85STheodore Ts'o __ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh, 301de05ca85STheodore Ts'o const char *function, unsigned int line) 302ac27a0ecSDave Kleikamp { 3033478c83cSTheodore Ts'o return check_xattrs(inode, bh, BFIRST(bh), bh->b_data + bh->b_size, 3043478c83cSTheodore Ts'o bh->b_data, function, line); 305ac27a0ecSDave Kleikamp } 306ac27a0ecSDave Kleikamp 307de05ca85STheodore Ts'o #define ext4_xattr_check_block(inode, bh) \ 308de05ca85STheodore Ts'o __ext4_xattr_check_block((inode), (bh), __func__, __LINE__) 309de05ca85STheodore Ts'o 310de05ca85STheodore Ts'o 3113478c83cSTheodore Ts'o static inline int 3129e92f48cSTheodore Ts'o __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, 3139e92f48cSTheodore Ts'o void *end, const char *function, unsigned int line) 3149e92f48cSTheodore Ts'o { 3153478c83cSTheodore Ts'o return check_xattrs(inode, NULL, IFIRST(header), end, IFIRST(header), 3163478c83cSTheodore Ts'o function, line); 3179e92f48cSTheodore Ts'o } 3189e92f48cSTheodore Ts'o 3199e92f48cSTheodore Ts'o #define xattr_check_inode(inode, header, end) \ 3209e92f48cSTheodore Ts'o __xattr_check_inode((inode), (header), (end), __func__, __LINE__) 3219e92f48cSTheodore Ts'o 322ac27a0ecSDave Kleikamp static int 3239496005dSTheodore Ts'o xattr_find_entry(struct inode *inode, struct ext4_xattr_entry **pentry, 3249496005dSTheodore Ts'o void *end, int name_index, const char *name, int sorted) 325ac27a0ecSDave Kleikamp { 3269496005dSTheodore Ts'o struct ext4_xattr_entry *entry, *next; 327ac27a0ecSDave Kleikamp size_t name_len; 328ac27a0ecSDave Kleikamp int cmp = 1; 329ac27a0ecSDave Kleikamp 330ac27a0ecSDave Kleikamp if (name == NULL) 331ac27a0ecSDave Kleikamp return -EINVAL; 332ac27a0ecSDave Kleikamp name_len = strlen(name); 3339496005dSTheodore Ts'o for (entry = *pentry; !IS_LAST_ENTRY(entry); entry = next) { 3349496005dSTheodore Ts'o next = EXT4_XATTR_NEXT(entry); 3359496005dSTheodore Ts'o if ((void *) next >= end) { 3369496005dSTheodore Ts'o EXT4_ERROR_INODE(inode, "corrupted xattr entries"); 3379496005dSTheodore Ts'o return -EFSCORRUPTED; 3389496005dSTheodore Ts'o } 339ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 340ac27a0ecSDave Kleikamp if (!cmp) 341ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 342ac27a0ecSDave Kleikamp if (!cmp) 343ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 344ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 345ac27a0ecSDave Kleikamp break; 346ac27a0ecSDave Kleikamp } 347ac27a0ecSDave Kleikamp *pentry = entry; 348ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 349ac27a0ecSDave Kleikamp } 350ac27a0ecSDave Kleikamp 351dec214d0STahsin Erdogan static u32 352dec214d0STahsin Erdogan ext4_xattr_inode_hash(struct ext4_sb_info *sbi, const void *buffer, size_t size) 353dec214d0STahsin Erdogan { 354dec214d0STahsin Erdogan return ext4_chksum(sbi, sbi->s_csum_seed, buffer, size); 355dec214d0STahsin Erdogan } 356dec214d0STahsin Erdogan 357dec214d0STahsin Erdogan static u64 ext4_xattr_inode_get_ref(struct inode *ea_inode) 358dec214d0STahsin Erdogan { 3591bc33893SJeff Layton return ((u64) inode_get_ctime(ea_inode).tv_sec << 32) | 360ee73f9a5SJeff Layton (u32) inode_peek_iversion_raw(ea_inode); 361dec214d0STahsin Erdogan } 362dec214d0STahsin Erdogan 363dec214d0STahsin Erdogan static void ext4_xattr_inode_set_ref(struct inode *ea_inode, u64 ref_count) 364dec214d0STahsin Erdogan { 3651bc33893SJeff Layton inode_set_ctime(ea_inode, (u32)(ref_count >> 32), 0); 366ee73f9a5SJeff Layton inode_set_iversion_raw(ea_inode, ref_count & 0xffffffff); 367dec214d0STahsin Erdogan } 368dec214d0STahsin Erdogan 369dec214d0STahsin Erdogan static u32 ext4_xattr_inode_get_hash(struct inode *ea_inode) 370dec214d0STahsin Erdogan { 371dec214d0STahsin Erdogan return (u32)ea_inode->i_atime.tv_sec; 372dec214d0STahsin Erdogan } 373dec214d0STahsin Erdogan 374dec214d0STahsin Erdogan static void ext4_xattr_inode_set_hash(struct inode *ea_inode, u32 hash) 375dec214d0STahsin Erdogan { 376dec214d0STahsin Erdogan ea_inode->i_atime.tv_sec = hash; 377dec214d0STahsin Erdogan } 378dec214d0STahsin Erdogan 379e50e5129SAndreas Dilger /* 380e50e5129SAndreas Dilger * Read the EA value from an inode. 381e50e5129SAndreas Dilger */ 38290966693STahsin Erdogan static int ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t size) 383e50e5129SAndreas Dilger { 3849699d4f9STahsin Erdogan int blocksize = 1 << ea_inode->i_blkbits; 3859699d4f9STahsin Erdogan int bh_count = (size + blocksize - 1) >> ea_inode->i_blkbits; 3869699d4f9STahsin Erdogan int tail_size = (size % blocksize) ?: blocksize; 3879699d4f9STahsin Erdogan struct buffer_head *bhs_inline[8]; 3889699d4f9STahsin Erdogan struct buffer_head **bhs = bhs_inline; 3899699d4f9STahsin Erdogan int i, ret; 390e50e5129SAndreas Dilger 3919699d4f9STahsin Erdogan if (bh_count > ARRAY_SIZE(bhs_inline)) { 3929699d4f9STahsin Erdogan bhs = kmalloc_array(bh_count, sizeof(*bhs), GFP_NOFS); 3939699d4f9STahsin Erdogan if (!bhs) 3949699d4f9STahsin Erdogan return -ENOMEM; 395e50e5129SAndreas Dilger } 3969699d4f9STahsin Erdogan 3979699d4f9STahsin Erdogan ret = ext4_bread_batch(ea_inode, 0 /* block */, bh_count, 3989699d4f9STahsin Erdogan true /* wait */, bhs); 3999699d4f9STahsin Erdogan if (ret) 4009699d4f9STahsin Erdogan goto free_bhs; 4019699d4f9STahsin Erdogan 4029699d4f9STahsin Erdogan for (i = 0; i < bh_count; i++) { 4039699d4f9STahsin Erdogan /* There shouldn't be any holes in ea_inode. */ 4049699d4f9STahsin Erdogan if (!bhs[i]) { 4059699d4f9STahsin Erdogan ret = -EFSCORRUPTED; 4069699d4f9STahsin Erdogan goto put_bhs; 4079699d4f9STahsin Erdogan } 4089699d4f9STahsin Erdogan memcpy((char *)buf + blocksize * i, bhs[i]->b_data, 4099699d4f9STahsin Erdogan i < bh_count - 1 ? blocksize : tail_size); 4109699d4f9STahsin Erdogan } 4119699d4f9STahsin Erdogan ret = 0; 4129699d4f9STahsin Erdogan put_bhs: 4139699d4f9STahsin Erdogan for (i = 0; i < bh_count; i++) 4149699d4f9STahsin Erdogan brelse(bhs[i]); 4159699d4f9STahsin Erdogan free_bhs: 4169699d4f9STahsin Erdogan if (bhs != bhs_inline) 4179699d4f9STahsin Erdogan kfree(bhs); 4189699d4f9STahsin Erdogan return ret; 419e50e5129SAndreas Dilger } 420e50e5129SAndreas Dilger 421a6d05676STahsin Erdogan #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec) 422a6d05676STahsin Erdogan 423bab79b04STahsin Erdogan static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, 424a6d05676STahsin Erdogan u32 ea_inode_hash, struct inode **ea_inode) 425e50e5129SAndreas Dilger { 426bab79b04STahsin Erdogan struct inode *inode; 427bab79b04STahsin Erdogan int err; 428e50e5129SAndreas Dilger 4290f7bfd6fSBaokun Li /* 4300f7bfd6fSBaokun Li * We have to check for this corruption early as otherwise 4310f7bfd6fSBaokun Li * iget_locked() could wait indefinitely for the state of our 4320f7bfd6fSBaokun Li * parent inode. 4330f7bfd6fSBaokun Li */ 4340f7bfd6fSBaokun Li if (parent->i_ino == ea_ino) { 4350f7bfd6fSBaokun Li ext4_error(parent->i_sb, 4360f7bfd6fSBaokun Li "Parent and EA inode have the same ino %lu", ea_ino); 4370f7bfd6fSBaokun Li return -EFSCORRUPTED; 4380f7bfd6fSBaokun Li } 4390f7bfd6fSBaokun Li 440b3e6bcb9STheodore Ts'o inode = ext4_iget(parent->i_sb, ea_ino, EXT4_IGET_EA_INODE); 441bab79b04STahsin Erdogan if (IS_ERR(inode)) { 442bab79b04STahsin Erdogan err = PTR_ERR(inode); 443dec214d0STahsin Erdogan ext4_error(parent->i_sb, 444dec214d0STahsin Erdogan "error while reading EA inode %lu err=%d", ea_ino, 445dec214d0STahsin Erdogan err); 446bab79b04STahsin Erdogan return err; 447e50e5129SAndreas Dilger } 448a6d05676STahsin Erdogan ext4_xattr_inode_set_class(inode); 449a6d05676STahsin Erdogan 450a6d05676STahsin Erdogan /* 451a6d05676STahsin Erdogan * Check whether this is an old Lustre-style xattr inode. Lustre 452a6d05676STahsin Erdogan * implementation does not have hash validation, rather it has a 453a6d05676STahsin Erdogan * backpointer from ea_inode to the parent inode. 454a6d05676STahsin Erdogan */ 455a6d05676STahsin Erdogan if (ea_inode_hash != ext4_xattr_inode_get_hash(inode) && 456a6d05676STahsin Erdogan EXT4_XATTR_INODE_GET_PARENT(inode) == parent->i_ino && 457a6d05676STahsin Erdogan inode->i_generation == parent->i_generation) { 458a6d05676STahsin Erdogan ext4_set_inode_state(inode, EXT4_STATE_LUSTRE_EA_INODE); 459a6d05676STahsin Erdogan ext4_xattr_inode_set_ref(inode, 1); 460a6d05676STahsin Erdogan } else { 461a6d05676STahsin Erdogan inode_lock(inode); 462a6d05676STahsin Erdogan inode->i_flags |= S_NOQUOTA; 463a6d05676STahsin Erdogan inode_unlock(inode); 464a6d05676STahsin Erdogan } 465a6d05676STahsin Erdogan 466bab79b04STahsin Erdogan *ea_inode = inode; 467bab79b04STahsin Erdogan return 0; 468e50e5129SAndreas Dilger } 469e50e5129SAndreas Dilger 4706bc0d63dSJan Kara /* Remove entry from mbcache when EA inode is getting evicted */ 4716bc0d63dSJan Kara void ext4_evict_ea_inode(struct inode *inode) 4726bc0d63dSJan Kara { 47365f8b800SJan Kara struct mb_cache_entry *oe; 47465f8b800SJan Kara 47565f8b800SJan Kara if (!EA_INODE_CACHE(inode)) 47665f8b800SJan Kara return; 47765f8b800SJan Kara /* Wait for entry to get unused so that we can remove it */ 47865f8b800SJan Kara while ((oe = mb_cache_entry_delete_or_get(EA_INODE_CACHE(inode), 47965f8b800SJan Kara ext4_xattr_inode_get_hash(inode), inode->i_ino))) { 48065f8b800SJan Kara mb_cache_entry_wait_unused(oe); 48165f8b800SJan Kara mb_cache_entry_put(EA_INODE_CACHE(inode), oe); 48265f8b800SJan Kara } 4836bc0d63dSJan Kara } 4846bc0d63dSJan Kara 485dec214d0STahsin Erdogan static int 486b9fc761eSTahsin Erdogan ext4_xattr_inode_verify_hashes(struct inode *ea_inode, 487b9fc761eSTahsin Erdogan struct ext4_xattr_entry *entry, void *buffer, 488b9fc761eSTahsin Erdogan size_t size) 489dec214d0STahsin Erdogan { 490dec214d0STahsin Erdogan u32 hash; 491dec214d0STahsin Erdogan 492dec214d0STahsin Erdogan /* Verify stored hash matches calculated hash. */ 493dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); 494dec214d0STahsin Erdogan if (hash != ext4_xattr_inode_get_hash(ea_inode)) 495dec214d0STahsin Erdogan return -EFSCORRUPTED; 496b9fc761eSTahsin Erdogan 497b9fc761eSTahsin Erdogan if (entry) { 498b9fc761eSTahsin Erdogan __le32 e_hash, tmp_data; 499b9fc761eSTahsin Erdogan 500b9fc761eSTahsin Erdogan /* Verify entry hash. */ 501b9fc761eSTahsin Erdogan tmp_data = cpu_to_le32(hash); 502b9fc761eSTahsin Erdogan e_hash = ext4_xattr_hash_entry(entry->e_name, entry->e_name_len, 503b9fc761eSTahsin Erdogan &tmp_data, 1); 504f3bbac32SLinus Torvalds /* All good? */ 505f3bbac32SLinus Torvalds if (e_hash == entry->e_hash) 506f3bbac32SLinus Torvalds return 0; 507f3bbac32SLinus Torvalds 508f3bbac32SLinus Torvalds /* 509f3bbac32SLinus Torvalds * Not good. Maybe the entry hash was calculated 510f3bbac32SLinus Torvalds * using the buggy signed char version? 511f3bbac32SLinus Torvalds */ 512f3bbac32SLinus Torvalds e_hash = ext4_xattr_hash_entry_signed(entry->e_name, entry->e_name_len, 513f3bbac32SLinus Torvalds &tmp_data, 1); 514f3bbac32SLinus Torvalds /* Still no match - bad */ 515854f0912SLinus Torvalds if (e_hash != entry->e_hash) 516b9fc761eSTahsin Erdogan return -EFSCORRUPTED; 517854f0912SLinus Torvalds 518854f0912SLinus Torvalds /* Let people know about old hash */ 519854f0912SLinus Torvalds pr_warn_once("ext4: filesystem with signed xattr name hash"); 520b9fc761eSTahsin Erdogan } 521dec214d0STahsin Erdogan return 0; 522dec214d0STahsin Erdogan } 523dec214d0STahsin Erdogan 524e50e5129SAndreas Dilger /* 525b9fc761eSTahsin Erdogan * Read xattr value from the EA inode. 526e50e5129SAndreas Dilger */ 527e50e5129SAndreas Dilger static int 528b9fc761eSTahsin Erdogan ext4_xattr_inode_get(struct inode *inode, struct ext4_xattr_entry *entry, 529b9fc761eSTahsin Erdogan void *buffer, size_t size) 530e50e5129SAndreas Dilger { 531dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 532bab79b04STahsin Erdogan struct inode *ea_inode; 533dec214d0STahsin Erdogan int err; 534e50e5129SAndreas Dilger 535b9fc761eSTahsin Erdogan err = ext4_xattr_inode_iget(inode, le32_to_cpu(entry->e_value_inum), 536a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), &ea_inode); 537dec214d0STahsin Erdogan if (err) { 538dec214d0STahsin Erdogan ea_inode = NULL; 539dec214d0STahsin Erdogan goto out; 540dec214d0STahsin Erdogan } 541e50e5129SAndreas Dilger 542dec214d0STahsin Erdogan if (i_size_read(ea_inode) != size) { 543dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 544dec214d0STahsin Erdogan "ea_inode file size=%llu entry size=%zu", 545dec214d0STahsin Erdogan i_size_read(ea_inode), size); 546dec214d0STahsin Erdogan err = -EFSCORRUPTED; 547dec214d0STahsin Erdogan goto out; 548dec214d0STahsin Erdogan } 549dec214d0STahsin Erdogan 550dec214d0STahsin Erdogan err = ext4_xattr_inode_read(ea_inode, buffer, size); 551dec214d0STahsin Erdogan if (err) 552dec214d0STahsin Erdogan goto out; 553dec214d0STahsin Erdogan 554a6d05676STahsin Erdogan if (!ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) { 555a6d05676STahsin Erdogan err = ext4_xattr_inode_verify_hashes(ea_inode, entry, buffer, 556a6d05676STahsin Erdogan size); 557a6d05676STahsin Erdogan if (err) { 558dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 559dec214d0STahsin Erdogan "EA inode hash validation failed"); 560dec214d0STahsin Erdogan goto out; 561dec214d0STahsin Erdogan } 562dec214d0STahsin Erdogan 563dec214d0STahsin Erdogan if (ea_inode_cache) 564dec214d0STahsin Erdogan mb_cache_entry_create(ea_inode_cache, GFP_NOFS, 565dec214d0STahsin Erdogan ext4_xattr_inode_get_hash(ea_inode), 566dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 567a6d05676STahsin Erdogan } 568dec214d0STahsin Erdogan out: 569e50e5129SAndreas Dilger iput(ea_inode); 570dec214d0STahsin Erdogan return err; 571e50e5129SAndreas Dilger } 572e50e5129SAndreas Dilger 573ac27a0ecSDave Kleikamp static int 574617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 575ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 576ac27a0ecSDave Kleikamp { 577ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 578617ba13bSMingming Cao struct ext4_xattr_entry *entry; 579ac27a0ecSDave Kleikamp size_t size; 5809496005dSTheodore Ts'o void *end; 581ac27a0ecSDave Kleikamp int error; 58247387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 583ac27a0ecSDave Kleikamp 584ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 585ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 586ac27a0ecSDave Kleikamp 587617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 588fb265c9cSTheodore Ts'o return -ENODATA; 589ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 590ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 591fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 592fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 593fb265c9cSTheodore Ts'o return PTR_ERR(bh); 594ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 595ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 596de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 597de05ca85STheodore Ts'o if (error) 598ac27a0ecSDave Kleikamp goto cleanup; 59947387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bh); 600ac27a0ecSDave Kleikamp entry = BFIRST(bh); 6019496005dSTheodore Ts'o end = bh->b_data + bh->b_size; 6029496005dSTheodore Ts'o error = xattr_find_entry(inode, &entry, end, name_index, name, 1); 603ac27a0ecSDave Kleikamp if (error) 604ac27a0ecSDave Kleikamp goto cleanup; 605ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 606ac27a0ecSDave Kleikamp error = -ERANGE; 60754dd0e0aSTheodore Ts'o if (unlikely(size > EXT4_XATTR_SIZE_MAX)) 60854dd0e0aSTheodore Ts'o goto cleanup; 60954dd0e0aSTheodore Ts'o if (buffer) { 610ac27a0ecSDave Kleikamp if (size > buffer_size) 611ac27a0ecSDave Kleikamp goto cleanup; 612e50e5129SAndreas Dilger if (entry->e_value_inum) { 613b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 614b9fc761eSTahsin Erdogan size); 615e50e5129SAndreas Dilger if (error) 616e50e5129SAndreas Dilger goto cleanup; 617e50e5129SAndreas Dilger } else { 61854dd0e0aSTheodore Ts'o u16 offset = le16_to_cpu(entry->e_value_offs); 61954dd0e0aSTheodore Ts'o void *p = bh->b_data + offset; 62054dd0e0aSTheodore Ts'o 62154dd0e0aSTheodore Ts'o if (unlikely(p + size > end)) 62254dd0e0aSTheodore Ts'o goto cleanup; 62354dd0e0aSTheodore Ts'o memcpy(buffer, p, size); 624e50e5129SAndreas Dilger } 625ac27a0ecSDave Kleikamp } 626ac27a0ecSDave Kleikamp error = size; 627ac27a0ecSDave Kleikamp 628ac27a0ecSDave Kleikamp cleanup: 629ac27a0ecSDave Kleikamp brelse(bh); 630ac27a0ecSDave Kleikamp return error; 631ac27a0ecSDave Kleikamp } 632ac27a0ecSDave Kleikamp 633879b3825STao Ma int 634617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 635ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 636ac27a0ecSDave Kleikamp { 637617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 638617ba13bSMingming Cao struct ext4_xattr_entry *entry; 639617ba13bSMingming Cao struct ext4_inode *raw_inode; 640617ba13bSMingming Cao struct ext4_iloc iloc; 641ac27a0ecSDave Kleikamp size_t size; 642ac27a0ecSDave Kleikamp void *end; 643ac27a0ecSDave Kleikamp int error; 644ac27a0ecSDave Kleikamp 64519f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 646ac27a0ecSDave Kleikamp return -ENODATA; 647617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 648ac27a0ecSDave Kleikamp if (error) 649ac27a0ecSDave Kleikamp return error; 650617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 651ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 652617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 6539e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 654ac27a0ecSDave Kleikamp if (error) 655ac27a0ecSDave Kleikamp goto cleanup; 6566ba644b9SEric Biggers entry = IFIRST(header); 6579496005dSTheodore Ts'o error = xattr_find_entry(inode, &entry, end, name_index, name, 0); 658ac27a0ecSDave Kleikamp if (error) 659ac27a0ecSDave Kleikamp goto cleanup; 660ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 661ac27a0ecSDave Kleikamp error = -ERANGE; 66254dd0e0aSTheodore Ts'o if (unlikely(size > EXT4_XATTR_SIZE_MAX)) 66354dd0e0aSTheodore Ts'o goto cleanup; 66454dd0e0aSTheodore Ts'o if (buffer) { 665ac27a0ecSDave Kleikamp if (size > buffer_size) 666ac27a0ecSDave Kleikamp goto cleanup; 667e50e5129SAndreas Dilger if (entry->e_value_inum) { 668b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 669b9fc761eSTahsin Erdogan size); 670e50e5129SAndreas Dilger if (error) 671e50e5129SAndreas Dilger goto cleanup; 672e50e5129SAndreas Dilger } else { 67354dd0e0aSTheodore Ts'o u16 offset = le16_to_cpu(entry->e_value_offs); 67454dd0e0aSTheodore Ts'o void *p = (void *)IFIRST(header) + offset; 67554dd0e0aSTheodore Ts'o 67654dd0e0aSTheodore Ts'o if (unlikely(p + size > end)) 67754dd0e0aSTheodore Ts'o goto cleanup; 67854dd0e0aSTheodore Ts'o memcpy(buffer, p, size); 679ac27a0ecSDave Kleikamp } 680e50e5129SAndreas Dilger } 681ac27a0ecSDave Kleikamp error = size; 682ac27a0ecSDave Kleikamp 683ac27a0ecSDave Kleikamp cleanup: 684ac27a0ecSDave Kleikamp brelse(iloc.bh); 685ac27a0ecSDave Kleikamp return error; 686ac27a0ecSDave Kleikamp } 687ac27a0ecSDave Kleikamp 688ac27a0ecSDave Kleikamp /* 689617ba13bSMingming Cao * ext4_xattr_get() 690ac27a0ecSDave Kleikamp * 691ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 692ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 693ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 694ac27a0ecSDave Kleikamp * 695ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 696ac27a0ecSDave Kleikamp * used / required on success. 697ac27a0ecSDave Kleikamp */ 698ac27a0ecSDave Kleikamp int 699617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 700ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 701ac27a0ecSDave Kleikamp { 702ac27a0ecSDave Kleikamp int error; 703ac27a0ecSDave Kleikamp 704eb8ab444SJan Kara if (unlikely(ext4_forced_shutdown(inode->i_sb))) 7050db1ff22STheodore Ts'o return -EIO; 7060db1ff22STheodore Ts'o 707230b8c1aSZhang Zhen if (strlen(name) > 255) 708230b8c1aSZhang Zhen return -ERANGE; 709230b8c1aSZhang Zhen 710617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 711617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 712ac27a0ecSDave Kleikamp buffer_size); 713ac27a0ecSDave Kleikamp if (error == -ENODATA) 714617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 715ac27a0ecSDave Kleikamp buffer_size); 716617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 717ac27a0ecSDave Kleikamp return error; 718ac27a0ecSDave Kleikamp } 719ac27a0ecSDave Kleikamp 720ac27a0ecSDave Kleikamp static int 721431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 722ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 723ac27a0ecSDave Kleikamp { 724ac27a0ecSDave Kleikamp size_t rest = buffer_size; 725ac27a0ecSDave Kleikamp 726617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 727a5488f29SChristian Brauner const char *prefix; 728ac27a0ecSDave Kleikamp 729a5488f29SChristian Brauner prefix = ext4_xattr_prefix(entry->e_name_index, dentry); 730a5488f29SChristian Brauner if (prefix) { 731764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 732764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 733764a5c6bSAndreas Gruenbacher 734ac27a0ecSDave Kleikamp if (buffer) { 735ac27a0ecSDave Kleikamp if (size > rest) 736ac27a0ecSDave Kleikamp return -ERANGE; 737764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 738764a5c6bSAndreas Gruenbacher buffer += prefix_len; 739764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 740764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 741764a5c6bSAndreas Gruenbacher *buffer++ = 0; 742ac27a0ecSDave Kleikamp } 743ac27a0ecSDave Kleikamp rest -= size; 744ac27a0ecSDave Kleikamp } 745ac27a0ecSDave Kleikamp } 746764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 747ac27a0ecSDave Kleikamp } 748ac27a0ecSDave Kleikamp 749ac27a0ecSDave Kleikamp static int 750431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 751ac27a0ecSDave Kleikamp { 7522b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 753ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 754ac27a0ecSDave Kleikamp int error; 755ac27a0ecSDave Kleikamp 756ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 757ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 758ac27a0ecSDave Kleikamp 759617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 760fb265c9cSTheodore Ts'o return 0; 761ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 762ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 763fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 764fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 765fb265c9cSTheodore Ts'o return PTR_ERR(bh); 766ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 767ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 768de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 769de05ca85STheodore Ts'o if (error) 770ac27a0ecSDave Kleikamp goto cleanup; 77147387409STahsin Erdogan ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); 772fb265c9cSTheodore Ts'o error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, 773fb265c9cSTheodore Ts'o buffer_size); 774ac27a0ecSDave Kleikamp cleanup: 775ac27a0ecSDave Kleikamp brelse(bh); 776ac27a0ecSDave Kleikamp return error; 777ac27a0ecSDave Kleikamp } 778ac27a0ecSDave Kleikamp 779ac27a0ecSDave Kleikamp static int 780431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 781ac27a0ecSDave Kleikamp { 7822b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 783617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 784617ba13bSMingming Cao struct ext4_inode *raw_inode; 785617ba13bSMingming Cao struct ext4_iloc iloc; 786ac27a0ecSDave Kleikamp void *end; 787ac27a0ecSDave Kleikamp int error; 788ac27a0ecSDave Kleikamp 78919f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 790ac27a0ecSDave Kleikamp return 0; 791617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 792ac27a0ecSDave Kleikamp if (error) 793ac27a0ecSDave Kleikamp return error; 794617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 795ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 796617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 7979e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 798ac27a0ecSDave Kleikamp if (error) 799ac27a0ecSDave Kleikamp goto cleanup; 800431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 801ac27a0ecSDave Kleikamp buffer, buffer_size); 802ac27a0ecSDave Kleikamp 803ac27a0ecSDave Kleikamp cleanup: 804ac27a0ecSDave Kleikamp brelse(iloc.bh); 805ac27a0ecSDave Kleikamp return error; 806ac27a0ecSDave Kleikamp } 807ac27a0ecSDave Kleikamp 808ac27a0ecSDave Kleikamp /* 809ba7ea1d8SEric Biggers * Inode operation listxattr() 810ba7ea1d8SEric Biggers * 811ba7ea1d8SEric Biggers * d_inode(dentry)->i_rwsem: don't care 812ac27a0ecSDave Kleikamp * 813ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 814ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 815ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 816ac27a0ecSDave Kleikamp * 817ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 818ac27a0ecSDave Kleikamp * used / required on success. 819ac27a0ecSDave Kleikamp */ 820ba7ea1d8SEric Biggers ssize_t 821ba7ea1d8SEric Biggers ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) 822ac27a0ecSDave Kleikamp { 823eaeef867STheodore Ts'o int ret, ret2; 824ac27a0ecSDave Kleikamp 8252b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 826eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 827eaeef867STheodore Ts'o if (ret < 0) 828eaeef867STheodore Ts'o goto errout; 829ac27a0ecSDave Kleikamp if (buffer) { 830eaeef867STheodore Ts'o buffer += ret; 831eaeef867STheodore Ts'o buffer_size -= ret; 832ac27a0ecSDave Kleikamp } 833eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 834eaeef867STheodore Ts'o if (ret < 0) 835eaeef867STheodore Ts'o goto errout; 836eaeef867STheodore Ts'o ret += ret2; 837eaeef867STheodore Ts'o errout: 8382b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 839eaeef867STheodore Ts'o return ret; 840ac27a0ecSDave Kleikamp } 841ac27a0ecSDave Kleikamp 842ac27a0ecSDave Kleikamp /* 843617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 844ac27a0ecSDave Kleikamp * not set, set it. 845ac27a0ecSDave Kleikamp */ 846617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 847ac27a0ecSDave Kleikamp struct super_block *sb) 848ac27a0ecSDave Kleikamp { 849e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 850ac27a0ecSDave Kleikamp return; 851ac27a0ecSDave Kleikamp 8525d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 853188c299eSJan Kara if (ext4_journal_get_write_access(handle, sb, EXT4_SB(sb)->s_sbh, 854188c299eSJan Kara EXT4_JTR_NONE) == 0) { 85505c2c00fSJan Kara lock_buffer(EXT4_SB(sb)->s_sbh); 856e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 85705c2c00fSJan Kara ext4_superblock_csum_set(sb); 85805c2c00fSJan Kara unlock_buffer(EXT4_SB(sb)->s_sbh); 859a3f5cf14SJan Kara ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); 860ac27a0ecSDave Kleikamp } 861ac27a0ecSDave Kleikamp } 862ac27a0ecSDave Kleikamp 8637a9ca53aSTahsin Erdogan int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) 8647a9ca53aSTahsin Erdogan { 8657a9ca53aSTahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 8667a9ca53aSTahsin Erdogan struct buffer_head *bh = NULL; 8677a9ca53aSTahsin Erdogan struct ext4_inode *raw_inode; 8687a9ca53aSTahsin Erdogan struct ext4_xattr_ibody_header *header; 8697a9ca53aSTahsin Erdogan struct ext4_xattr_entry *entry; 8707a9ca53aSTahsin Erdogan qsize_t ea_inode_refs = 0; 8717a9ca53aSTahsin Erdogan void *end; 8727a9ca53aSTahsin Erdogan int ret; 8737a9ca53aSTahsin Erdogan 8747a9ca53aSTahsin Erdogan lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); 8757a9ca53aSTahsin Erdogan 8767a9ca53aSTahsin Erdogan if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 8777a9ca53aSTahsin Erdogan ret = ext4_get_inode_loc(inode, &iloc); 8787a9ca53aSTahsin Erdogan if (ret) 8797a9ca53aSTahsin Erdogan goto out; 8807a9ca53aSTahsin Erdogan raw_inode = ext4_raw_inode(&iloc); 8817a9ca53aSTahsin Erdogan header = IHDR(inode, raw_inode); 8827a9ca53aSTahsin Erdogan end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 8837a9ca53aSTahsin Erdogan ret = xattr_check_inode(inode, header, end); 8847a9ca53aSTahsin Erdogan if (ret) 8857a9ca53aSTahsin Erdogan goto out; 8867a9ca53aSTahsin Erdogan 8877a9ca53aSTahsin Erdogan for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); 8887a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 8897a9ca53aSTahsin Erdogan if (entry->e_value_inum) 8907a9ca53aSTahsin Erdogan ea_inode_refs++; 8917a9ca53aSTahsin Erdogan } 8927a9ca53aSTahsin Erdogan 8937a9ca53aSTahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 894fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 895fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 896fb265c9cSTheodore Ts'o ret = PTR_ERR(bh); 8977159a986SDan Carpenter bh = NULL; 8987a9ca53aSTahsin Erdogan goto out; 8997a9ca53aSTahsin Erdogan } 9007a9ca53aSTahsin Erdogan 901de05ca85STheodore Ts'o ret = ext4_xattr_check_block(inode, bh); 902de05ca85STheodore Ts'o if (ret) 9037a9ca53aSTahsin Erdogan goto out; 9047a9ca53aSTahsin Erdogan 9057a9ca53aSTahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 9067a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 9077a9ca53aSTahsin Erdogan if (entry->e_value_inum) 9087a9ca53aSTahsin Erdogan ea_inode_refs++; 9097a9ca53aSTahsin Erdogan } 9107a9ca53aSTahsin Erdogan *usage = ea_inode_refs + 1; 9117a9ca53aSTahsin Erdogan ret = 0; 9127a9ca53aSTahsin Erdogan out: 9137a9ca53aSTahsin Erdogan brelse(iloc.bh); 9147a9ca53aSTahsin Erdogan brelse(bh); 9157a9ca53aSTahsin Erdogan return ret; 9167a9ca53aSTahsin Erdogan } 9177a9ca53aSTahsin Erdogan 918dec214d0STahsin Erdogan static inline size_t round_up_cluster(struct inode *inode, size_t length) 919dec214d0STahsin Erdogan { 920dec214d0STahsin Erdogan struct super_block *sb = inode->i_sb; 921dec214d0STahsin Erdogan size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + 922dec214d0STahsin Erdogan inode->i_blkbits); 923dec214d0STahsin Erdogan size_t mask = ~(cluster_size - 1); 924dec214d0STahsin Erdogan 925dec214d0STahsin Erdogan return (length + cluster_size - 1) & mask; 926dec214d0STahsin Erdogan } 927dec214d0STahsin Erdogan 928dec214d0STahsin Erdogan static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) 929dec214d0STahsin Erdogan { 930dec214d0STahsin Erdogan int err; 931dec214d0STahsin Erdogan 932dec214d0STahsin Erdogan err = dquot_alloc_inode(inode); 933dec214d0STahsin Erdogan if (err) 934dec214d0STahsin Erdogan return err; 935dec214d0STahsin Erdogan err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); 936dec214d0STahsin Erdogan if (err) 937dec214d0STahsin Erdogan dquot_free_inode(inode); 938dec214d0STahsin Erdogan return err; 939dec214d0STahsin Erdogan } 940dec214d0STahsin Erdogan 941a6d05676STahsin Erdogan static void ext4_xattr_inode_free_quota(struct inode *parent, 942a6d05676STahsin Erdogan struct inode *ea_inode, 943a6d05676STahsin Erdogan size_t len) 944dec214d0STahsin Erdogan { 945a6d05676STahsin Erdogan if (ea_inode && 946a6d05676STahsin Erdogan ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) 947a6d05676STahsin Erdogan return; 948a6d05676STahsin Erdogan dquot_free_space_nodirty(parent, round_up_cluster(parent, len)); 949a6d05676STahsin Erdogan dquot_free_inode(parent); 950dec214d0STahsin Erdogan } 951dec214d0STahsin Erdogan 952af65207cSTahsin Erdogan int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode, 953af65207cSTahsin Erdogan struct buffer_head *block_bh, size_t value_len, 954af65207cSTahsin Erdogan bool is_create) 955dec214d0STahsin Erdogan { 956dec214d0STahsin Erdogan int credits; 957dec214d0STahsin Erdogan int blocks; 958dec214d0STahsin Erdogan 959dec214d0STahsin Erdogan /* 960dec214d0STahsin Erdogan * 1) Owner inode update 961dec214d0STahsin Erdogan * 2) Ref count update on old xattr block 962dec214d0STahsin Erdogan * 3) new xattr block 963dec214d0STahsin Erdogan * 4) block bitmap update for new xattr block 964dec214d0STahsin Erdogan * 5) group descriptor for new xattr block 965dec214d0STahsin Erdogan * 6) block bitmap update for old xattr block 966dec214d0STahsin Erdogan * 7) group descriptor for old block 967dec214d0STahsin Erdogan * 968dec214d0STahsin Erdogan * 6 & 7 can happen if we have two racing threads T_a and T_b 969dec214d0STahsin Erdogan * which are each trying to set an xattr on inodes I_a and I_b 970dec214d0STahsin Erdogan * which were both initially sharing an xattr block. 971dec214d0STahsin Erdogan */ 972dec214d0STahsin Erdogan credits = 7; 973dec214d0STahsin Erdogan 974dec214d0STahsin Erdogan /* Quota updates. */ 975dec214d0STahsin Erdogan credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); 976dec214d0STahsin Erdogan 977dec214d0STahsin Erdogan /* 978dec214d0STahsin Erdogan * In case of inline data, we may push out the data to a block, 979dec214d0STahsin Erdogan * so we need to reserve credits for this eventuality 980dec214d0STahsin Erdogan */ 981af65207cSTahsin Erdogan if (inode && ext4_has_inline_data(inode)) 982dec214d0STahsin Erdogan credits += ext4_writepage_trans_blocks(inode) + 1; 983dec214d0STahsin Erdogan 984dec214d0STahsin Erdogan /* We are done if ea_inode feature is not enabled. */ 985dec214d0STahsin Erdogan if (!ext4_has_feature_ea_inode(sb)) 986dec214d0STahsin Erdogan return credits; 987dec214d0STahsin Erdogan 988dec214d0STahsin Erdogan /* New ea_inode, inode map, block bitmap, group descriptor. */ 989dec214d0STahsin Erdogan credits += 4; 990dec214d0STahsin Erdogan 991dec214d0STahsin Erdogan /* Data blocks. */ 992dec214d0STahsin Erdogan blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 993dec214d0STahsin Erdogan 994dec214d0STahsin Erdogan /* Indirection block or one level of extent tree. */ 995dec214d0STahsin Erdogan blocks += 1; 996dec214d0STahsin Erdogan 997dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 998dec214d0STahsin Erdogan credits += blocks * 2; 999dec214d0STahsin Erdogan 1000dec214d0STahsin Erdogan /* Blocks themselves. */ 1001dec214d0STahsin Erdogan credits += blocks; 1002dec214d0STahsin Erdogan 1003af65207cSTahsin Erdogan if (!is_create) { 1004dec214d0STahsin Erdogan /* Dereference ea_inode holding old xattr value. 1005dec214d0STahsin Erdogan * Old ea_inode, inode map, block bitmap, group descriptor. 1006dec214d0STahsin Erdogan */ 1007dec214d0STahsin Erdogan credits += 4; 1008dec214d0STahsin Erdogan 1009dec214d0STahsin Erdogan /* Data blocks for old ea_inode. */ 1010dec214d0STahsin Erdogan blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; 1011dec214d0STahsin Erdogan 1012af65207cSTahsin Erdogan /* Indirection block or one level of extent tree for old 1013af65207cSTahsin Erdogan * ea_inode. 1014af65207cSTahsin Erdogan */ 1015dec214d0STahsin Erdogan blocks += 1; 1016dec214d0STahsin Erdogan 1017dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 1018dec214d0STahsin Erdogan credits += blocks * 2; 1019af65207cSTahsin Erdogan } 1020dec214d0STahsin Erdogan 1021dec214d0STahsin Erdogan /* We may need to clone the existing xattr block in which case we need 1022dec214d0STahsin Erdogan * to increment ref counts for existing ea_inodes referenced by it. 1023dec214d0STahsin Erdogan */ 1024dec214d0STahsin Erdogan if (block_bh) { 1025dec214d0STahsin Erdogan struct ext4_xattr_entry *entry = BFIRST(block_bh); 1026dec214d0STahsin Erdogan 1027dec214d0STahsin Erdogan for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) 1028dec214d0STahsin Erdogan if (entry->e_value_inum) 1029dec214d0STahsin Erdogan /* Ref count update on ea_inode. */ 1030dec214d0STahsin Erdogan credits += 1; 1031dec214d0STahsin Erdogan } 1032dec214d0STahsin Erdogan return credits; 1033dec214d0STahsin Erdogan } 1034dec214d0STahsin Erdogan 1035dec214d0STahsin Erdogan static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, 1036dec214d0STahsin Erdogan int ref_change) 1037dec214d0STahsin Erdogan { 1038dec214d0STahsin Erdogan struct ext4_iloc iloc; 1039dec214d0STahsin Erdogan s64 ref_count; 1040dec214d0STahsin Erdogan int ret; 1041dec214d0STahsin Erdogan 1042dec214d0STahsin Erdogan inode_lock(ea_inode); 1043dec214d0STahsin Erdogan 1044dec214d0STahsin Erdogan ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); 10451bfc204dSVasily Averin if (ret) 1046dec214d0STahsin Erdogan goto out; 1047dec214d0STahsin Erdogan 1048dec214d0STahsin Erdogan ref_count = ext4_xattr_inode_get_ref(ea_inode); 1049dec214d0STahsin Erdogan ref_count += ref_change; 1050dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, ref_count); 1051dec214d0STahsin Erdogan 1052dec214d0STahsin Erdogan if (ref_change > 0) { 1053dec214d0STahsin Erdogan WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", 1054dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1055dec214d0STahsin Erdogan 1056dec214d0STahsin Erdogan if (ref_count == 1) { 1057dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", 1058dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1059dec214d0STahsin Erdogan 1060dec214d0STahsin Erdogan set_nlink(ea_inode, 1); 1061dec214d0STahsin Erdogan ext4_orphan_del(handle, ea_inode); 1062cdb7ee4cSTahsin Erdogan } 1063dec214d0STahsin Erdogan } else { 1064dec214d0STahsin Erdogan WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", 1065dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1066dec214d0STahsin Erdogan 1067dec214d0STahsin Erdogan if (ref_count == 0) { 1068dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink != 1, 1069dec214d0STahsin Erdogan "EA inode %lu i_nlink=%u", 1070dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1071dec214d0STahsin Erdogan 1072dec214d0STahsin Erdogan clear_nlink(ea_inode); 1073dec214d0STahsin Erdogan ext4_orphan_add(handle, ea_inode); 1074dec214d0STahsin Erdogan } 1075cdb7ee4cSTahsin Erdogan } 1076dec214d0STahsin Erdogan 1077dec214d0STahsin Erdogan ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); 1078dec214d0STahsin Erdogan if (ret) 1079dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 1080dec214d0STahsin Erdogan "ext4_mark_iloc_dirty() failed ret=%d", ret); 1081dec214d0STahsin Erdogan out: 1082dec214d0STahsin Erdogan inode_unlock(ea_inode); 1083dec214d0STahsin Erdogan return ret; 1084dec214d0STahsin Erdogan } 1085dec214d0STahsin Erdogan 1086dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) 1087dec214d0STahsin Erdogan { 1088dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, 1); 1089dec214d0STahsin Erdogan } 1090dec214d0STahsin Erdogan 1091dec214d0STahsin Erdogan static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) 1092dec214d0STahsin Erdogan { 1093dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, -1); 1094dec214d0STahsin Erdogan } 1095dec214d0STahsin Erdogan 1096dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, 1097dec214d0STahsin Erdogan struct ext4_xattr_entry *first) 1098dec214d0STahsin Erdogan { 1099dec214d0STahsin Erdogan struct inode *ea_inode; 1100dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 1101dec214d0STahsin Erdogan struct ext4_xattr_entry *failed_entry; 1102dec214d0STahsin Erdogan unsigned int ea_ino; 1103dec214d0STahsin Erdogan int err, saved_err; 1104dec214d0STahsin Erdogan 1105dec214d0STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 1106dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1107dec214d0STahsin Erdogan if (!entry->e_value_inum) 1108dec214d0STahsin Erdogan continue; 1109dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1110a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1111a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1112a6d05676STahsin Erdogan &ea_inode); 1113dec214d0STahsin Erdogan if (err) 1114dec214d0STahsin Erdogan goto cleanup; 1115dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1116dec214d0STahsin Erdogan if (err) { 1117dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "inc ref error %d", err); 1118dec214d0STahsin Erdogan iput(ea_inode); 1119dec214d0STahsin Erdogan goto cleanup; 1120dec214d0STahsin Erdogan } 1121dec214d0STahsin Erdogan iput(ea_inode); 1122dec214d0STahsin Erdogan } 1123dec214d0STahsin Erdogan return 0; 1124dec214d0STahsin Erdogan 1125dec214d0STahsin Erdogan cleanup: 1126dec214d0STahsin Erdogan saved_err = err; 1127dec214d0STahsin Erdogan failed_entry = entry; 1128dec214d0STahsin Erdogan 1129dec214d0STahsin Erdogan for (entry = first; entry != failed_entry; 1130dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1131dec214d0STahsin Erdogan if (!entry->e_value_inum) 1132dec214d0STahsin Erdogan continue; 1133dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1134a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1135a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1136a6d05676STahsin Erdogan &ea_inode); 1137dec214d0STahsin Erdogan if (err) { 1138dec214d0STahsin Erdogan ext4_warning(parent->i_sb, 1139dec214d0STahsin Erdogan "cleanup ea_ino %u iget error %d", ea_ino, 1140dec214d0STahsin Erdogan err); 1141dec214d0STahsin Erdogan continue; 1142dec214d0STahsin Erdogan } 1143dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1144dec214d0STahsin Erdogan if (err) 1145dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "cleanup dec ref error %d", 1146dec214d0STahsin Erdogan err); 1147dec214d0STahsin Erdogan iput(ea_inode); 1148dec214d0STahsin Erdogan } 1149dec214d0STahsin Erdogan return saved_err; 1150dec214d0STahsin Erdogan } 1151dec214d0STahsin Erdogan 1152a4130367SJan Kara static int ext4_xattr_restart_fn(handle_t *handle, struct inode *inode, 1153a4130367SJan Kara struct buffer_head *bh, bool block_csum, bool dirty) 1154a4130367SJan Kara { 1155a4130367SJan Kara int error; 1156a4130367SJan Kara 1157a4130367SJan Kara if (bh && dirty) { 1158a4130367SJan Kara if (block_csum) 1159a4130367SJan Kara ext4_xattr_block_csum_set(inode, bh); 1160a4130367SJan Kara error = ext4_handle_dirty_metadata(handle, NULL, bh); 1161a4130367SJan Kara if (error) { 1162a4130367SJan Kara ext4_warning(inode->i_sb, "Handle metadata (error %d)", 1163a4130367SJan Kara error); 1164a4130367SJan Kara return error; 1165a4130367SJan Kara } 1166a4130367SJan Kara } 1167a4130367SJan Kara return 0; 1168a4130367SJan Kara } 1169a4130367SJan Kara 117030a7eb97STahsin Erdogan static void 1171dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, 117230a7eb97STahsin Erdogan struct buffer_head *bh, 117330a7eb97STahsin Erdogan struct ext4_xattr_entry *first, bool block_csum, 117430a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1175dec214d0STahsin Erdogan int extra_credits, bool skip_quota) 117630a7eb97STahsin Erdogan { 117730a7eb97STahsin Erdogan struct inode *ea_inode; 117830a7eb97STahsin Erdogan struct ext4_xattr_entry *entry; 117930a7eb97STahsin Erdogan bool dirty = false; 118030a7eb97STahsin Erdogan unsigned int ea_ino; 118130a7eb97STahsin Erdogan int err; 118230a7eb97STahsin Erdogan int credits; 118330a7eb97STahsin Erdogan 118430a7eb97STahsin Erdogan /* One credit for dec ref on ea_inode, one for orphan list addition, */ 118530a7eb97STahsin Erdogan credits = 2 + extra_credits; 118630a7eb97STahsin Erdogan 118730a7eb97STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 118830a7eb97STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 118930a7eb97STahsin Erdogan if (!entry->e_value_inum) 119030a7eb97STahsin Erdogan continue; 119130a7eb97STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1192a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1193a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1194a6d05676STahsin Erdogan &ea_inode); 119530a7eb97STahsin Erdogan if (err) 119630a7eb97STahsin Erdogan continue; 119730a7eb97STahsin Erdogan 119830a7eb97STahsin Erdogan err = ext4_expand_inode_array(ea_inode_array, ea_inode); 119930a7eb97STahsin Erdogan if (err) { 120030a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, 120130a7eb97STahsin Erdogan "Expand inode array err=%d", err); 120230a7eb97STahsin Erdogan iput(ea_inode); 120330a7eb97STahsin Erdogan continue; 120430a7eb97STahsin Erdogan } 120530a7eb97STahsin Erdogan 1206a4130367SJan Kara err = ext4_journal_ensure_credits_fn(handle, credits, credits, 120783448bdfSJan Kara ext4_free_metadata_revoke_credits(parent->i_sb, 1), 1208a4130367SJan Kara ext4_xattr_restart_fn(handle, parent, bh, block_csum, 1209a4130367SJan Kara dirty)); 1210a4130367SJan Kara if (err < 0) { 121130a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, "Ensure credits err=%d", 121230a7eb97STahsin Erdogan err); 121330a7eb97STahsin Erdogan continue; 121430a7eb97STahsin Erdogan } 1215a4130367SJan Kara if (err > 0) { 1216188c299eSJan Kara err = ext4_journal_get_write_access(handle, 1217188c299eSJan Kara parent->i_sb, bh, EXT4_JTR_NONE); 1218a4130367SJan Kara if (err) { 1219a4130367SJan Kara ext4_warning_inode(ea_inode, 1220a4130367SJan Kara "Re-get write access err=%d", 1221a4130367SJan Kara err); 1222a4130367SJan Kara continue; 1223a4130367SJan Kara } 1224a4130367SJan Kara } 122530a7eb97STahsin Erdogan 1226dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1227dec214d0STahsin Erdogan if (err) { 1228dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", 1229dec214d0STahsin Erdogan err); 1230dec214d0STahsin Erdogan continue; 1231dec214d0STahsin Erdogan } 1232dec214d0STahsin Erdogan 1233dec214d0STahsin Erdogan if (!skip_quota) 1234a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(parent, ea_inode, 1235dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 123630a7eb97STahsin Erdogan 123730a7eb97STahsin Erdogan /* 123830a7eb97STahsin Erdogan * Forget about ea_inode within the same transaction that 123930a7eb97STahsin Erdogan * decrements the ref count. This avoids duplicate decrements in 124030a7eb97STahsin Erdogan * case the rest of the work spills over to subsequent 124130a7eb97STahsin Erdogan * transactions. 124230a7eb97STahsin Erdogan */ 124330a7eb97STahsin Erdogan entry->e_value_inum = 0; 124430a7eb97STahsin Erdogan entry->e_value_size = 0; 124530a7eb97STahsin Erdogan 124630a7eb97STahsin Erdogan dirty = true; 124730a7eb97STahsin Erdogan } 124830a7eb97STahsin Erdogan 124930a7eb97STahsin Erdogan if (dirty) { 125030a7eb97STahsin Erdogan /* 125130a7eb97STahsin Erdogan * Note that we are deliberately skipping csum calculation for 125230a7eb97STahsin Erdogan * the final update because we do not expect any journal 125330a7eb97STahsin Erdogan * restarts until xattr block is freed. 125430a7eb97STahsin Erdogan */ 125530a7eb97STahsin Erdogan 125630a7eb97STahsin Erdogan err = ext4_handle_dirty_metadata(handle, NULL, bh); 125730a7eb97STahsin Erdogan if (err) 125830a7eb97STahsin Erdogan ext4_warning_inode(parent, 125930a7eb97STahsin Erdogan "handle dirty metadata err=%d", err); 126030a7eb97STahsin Erdogan } 126130a7eb97STahsin Erdogan } 126230a7eb97STahsin Erdogan 1263ac27a0ecSDave Kleikamp /* 1264ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 1265ec4cb1aaSJan Kara * otherwise free the block. 1266ac27a0ecSDave Kleikamp */ 1267ac27a0ecSDave Kleikamp static void 1268617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 1269dec214d0STahsin Erdogan struct buffer_head *bh, 1270dec214d0STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1271dec214d0STahsin Erdogan int extra_credits) 1272ac27a0ecSDave Kleikamp { 127347387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 12746048c64bSAndreas Gruenbacher u32 hash, ref; 12758a2bfdcbSMingming Cao int error = 0; 1276ac27a0ecSDave Kleikamp 12775d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 1278188c299eSJan Kara error = ext4_journal_get_write_access(handle, inode->i_sb, bh, 1279188c299eSJan Kara EXT4_JTR_NONE); 12808a2bfdcbSMingming Cao if (error) 12818a2bfdcbSMingming Cao goto out; 12828a2bfdcbSMingming Cao 128365f8b800SJan Kara retry_ref: 12848a2bfdcbSMingming Cao lock_buffer(bh); 12856048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 12866048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 12876048c64bSAndreas Gruenbacher if (ref == 1) { 1288ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 128982939d79SJan Kara /* 129082939d79SJan Kara * This must happen under buffer lock for 129182939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 129282939d79SJan Kara */ 129365f8b800SJan Kara if (ea_block_cache) { 129465f8b800SJan Kara struct mb_cache_entry *oe; 129565f8b800SJan Kara 129665f8b800SJan Kara oe = mb_cache_entry_delete_or_get(ea_block_cache, hash, 1297cdb7ee4cSTahsin Erdogan bh->b_blocknr); 129865f8b800SJan Kara if (oe) { 129965f8b800SJan Kara unlock_buffer(bh); 130065f8b800SJan Kara mb_cache_entry_wait_unused(oe); 130165f8b800SJan Kara mb_cache_entry_put(ea_block_cache, oe); 130265f8b800SJan Kara goto retry_ref; 130365f8b800SJan Kara } 130465f8b800SJan Kara } 1305ac27a0ecSDave Kleikamp get_bh(bh); 1306ec4cb1aaSJan Kara unlock_buffer(bh); 1307dec214d0STahsin Erdogan 1308dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) 1309dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, bh, 1310dec214d0STahsin Erdogan BFIRST(bh), 1311dec214d0STahsin Erdogan true /* block_csum */, 1312dec214d0STahsin Erdogan ea_inode_array, 1313dec214d0STahsin Erdogan extra_credits, 1314dec214d0STahsin Erdogan true /* skip_quota */); 1315e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 1316e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 1317e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 1318ac27a0ecSDave Kleikamp } else { 13196048c64bSAndreas Gruenbacher ref--; 13206048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 13216048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 13226048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 13236048c64bSAndreas Gruenbacher 1324cdb7ee4cSTahsin Erdogan if (ea_block_cache) { 132547387409STahsin Erdogan ce = mb_cache_entry_get(ea_block_cache, hash, 13266048c64bSAndreas Gruenbacher bh->b_blocknr); 13276048c64bSAndreas Gruenbacher if (ce) { 1328a44e84a9SJan Kara set_bit(MBE_REUSABLE_B, &ce->e_flags); 132947387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 13306048c64bSAndreas Gruenbacher } 13316048c64bSAndreas Gruenbacher } 1332cdb7ee4cSTahsin Erdogan } 13336048c64bSAndreas Gruenbacher 1334dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bh); 1335ec4cb1aaSJan Kara /* 1336ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 1337ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 1338ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 1339ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 1340ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 1341dac7a4b4STheodore Ts'o * call ext4_handle_dirty_metadata() with locked buffer as 1342ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 1343ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 1344ec4cb1aaSJan Kara */ 1345ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 1346dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1347c1bb05a6SEric Sandeen unlock_buffer(bh); 1348ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 1349dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1350ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 13510390131bSFrank Mayhar ext4_handle_sync(handle); 13521231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 1353ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 1354ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 1355ac27a0ecSDave Kleikamp } 13568a2bfdcbSMingming Cao out: 13578a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 13588a2bfdcbSMingming Cao return; 1359ac27a0ecSDave Kleikamp } 1360ac27a0ecSDave Kleikamp 13616dd4ee7cSKalpak Shah /* 13626dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 13636dd4ee7cSKalpak Shah * bytes used by EA entries. 13646dd4ee7cSKalpak Shah */ 13656dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 13666dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 13676dd4ee7cSKalpak Shah { 13686dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1369e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 13706dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 13716dd4ee7cSKalpak Shah if (offs < *min_offs) 13726dd4ee7cSKalpak Shah *min_offs = offs; 13736dd4ee7cSKalpak Shah } 13747b1b2c1bSTheodore Ts'o if (total) 13757b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 13766dd4ee7cSKalpak Shah } 13776dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 13786dd4ee7cSKalpak Shah } 13796dd4ee7cSKalpak Shah 1380e50e5129SAndreas Dilger /* 1381e50e5129SAndreas Dilger * Write the value of the EA in an inode. 1382e50e5129SAndreas Dilger */ 1383e50e5129SAndreas Dilger static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, 1384e50e5129SAndreas Dilger const void *buf, int bufsize) 1385e50e5129SAndreas Dilger { 1386e50e5129SAndreas Dilger struct buffer_head *bh = NULL; 1387e50e5129SAndreas Dilger unsigned long block = 0; 1388dec214d0STahsin Erdogan int blocksize = ea_inode->i_sb->s_blocksize; 1389dec214d0STahsin Erdogan int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; 1390e50e5129SAndreas Dilger int csize, wsize = 0; 13914209ae12SHarshad Shirwadkar int ret = 0, ret2 = 0; 1392e50e5129SAndreas Dilger int retries = 0; 1393e50e5129SAndreas Dilger 1394e50e5129SAndreas Dilger retry: 1395e50e5129SAndreas Dilger while (ret >= 0 && ret < max_blocks) { 1396e50e5129SAndreas Dilger struct ext4_map_blocks map; 1397e50e5129SAndreas Dilger map.m_lblk = block += ret; 1398e50e5129SAndreas Dilger map.m_len = max_blocks -= ret; 1399e50e5129SAndreas Dilger 1400e50e5129SAndreas Dilger ret = ext4_map_blocks(handle, ea_inode, &map, 1401e50e5129SAndreas Dilger EXT4_GET_BLOCKS_CREATE); 1402e50e5129SAndreas Dilger if (ret <= 0) { 1403e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1404e50e5129SAndreas Dilger if (ret == -ENOSPC && 1405e50e5129SAndreas Dilger ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { 1406e50e5129SAndreas Dilger ret = 0; 1407e50e5129SAndreas Dilger goto retry; 1408e50e5129SAndreas Dilger } 1409e50e5129SAndreas Dilger break; 1410e50e5129SAndreas Dilger } 1411e50e5129SAndreas Dilger } 1412e50e5129SAndreas Dilger 1413e50e5129SAndreas Dilger if (ret < 0) 1414e50e5129SAndreas Dilger return ret; 1415e50e5129SAndreas Dilger 1416e50e5129SAndreas Dilger block = 0; 1417e50e5129SAndreas Dilger while (wsize < bufsize) { 1418e50e5129SAndreas Dilger brelse(bh); 1419e50e5129SAndreas Dilger csize = (bufsize - wsize) > blocksize ? blocksize : 1420e50e5129SAndreas Dilger bufsize - wsize; 1421e50e5129SAndreas Dilger bh = ext4_getblk(handle, ea_inode, block, 0); 1422e50e5129SAndreas Dilger if (IS_ERR(bh)) 1423e50e5129SAndreas Dilger return PTR_ERR(bh); 1424eb6984faSVasily Averin if (!bh) { 1425eb6984faSVasily Averin WARN_ON_ONCE(1); 1426eb6984faSVasily Averin EXT4_ERROR_INODE(ea_inode, 1427eb6984faSVasily Averin "ext4_getblk() return bh = NULL"); 1428eb6984faSVasily Averin return -EFSCORRUPTED; 1429eb6984faSVasily Averin } 1430188c299eSJan Kara ret = ext4_journal_get_write_access(handle, ea_inode->i_sb, bh, 1431188c299eSJan Kara EXT4_JTR_NONE); 1432e50e5129SAndreas Dilger if (ret) 1433e50e5129SAndreas Dilger goto out; 1434e50e5129SAndreas Dilger 1435e50e5129SAndreas Dilger memcpy(bh->b_data, buf, csize); 1436e50e5129SAndreas Dilger set_buffer_uptodate(bh); 1437e50e5129SAndreas Dilger ext4_handle_dirty_metadata(handle, ea_inode, bh); 1438e50e5129SAndreas Dilger 1439e50e5129SAndreas Dilger buf += csize; 1440e50e5129SAndreas Dilger wsize += csize; 1441e50e5129SAndreas Dilger block += 1; 1442e50e5129SAndreas Dilger } 1443e50e5129SAndreas Dilger 1444e50e5129SAndreas Dilger inode_lock(ea_inode); 1445e50e5129SAndreas Dilger i_size_write(ea_inode, wsize); 1446e50e5129SAndreas Dilger ext4_update_i_disksize(ea_inode, wsize); 1447e50e5129SAndreas Dilger inode_unlock(ea_inode); 1448e50e5129SAndreas Dilger 14494209ae12SHarshad Shirwadkar ret2 = ext4_mark_inode_dirty(handle, ea_inode); 14504209ae12SHarshad Shirwadkar if (unlikely(ret2 && !ret)) 14514209ae12SHarshad Shirwadkar ret = ret2; 1452e50e5129SAndreas Dilger 1453e50e5129SAndreas Dilger out: 1454e50e5129SAndreas Dilger brelse(bh); 1455e50e5129SAndreas Dilger 1456e50e5129SAndreas Dilger return ret; 1457e50e5129SAndreas Dilger } 1458e50e5129SAndreas Dilger 1459e50e5129SAndreas Dilger /* 1460e50e5129SAndreas Dilger * Create an inode to store the value of a large EA. 1461e50e5129SAndreas Dilger */ 1462e50e5129SAndreas Dilger static struct inode *ext4_xattr_inode_create(handle_t *handle, 1463dec214d0STahsin Erdogan struct inode *inode, u32 hash) 1464e50e5129SAndreas Dilger { 1465e50e5129SAndreas Dilger struct inode *ea_inode = NULL; 14669e1ba001STahsin Erdogan uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; 1467bd3b963bSTahsin Erdogan int err; 1468e50e5129SAndreas Dilger 1469f31173c1SJun Nie if (inode->i_sb->s_root == NULL) { 1470f31173c1SJun Nie ext4_warning(inode->i_sb, 1471f31173c1SJun Nie "refuse to create EA inode when umounting"); 1472f31173c1SJun Nie WARN_ON(1); 1473f31173c1SJun Nie return ERR_PTR(-EINVAL); 1474f31173c1SJun Nie } 1475f31173c1SJun Nie 1476e50e5129SAndreas Dilger /* 1477e50e5129SAndreas Dilger * Let the next inode be the goal, so we try and allocate the EA inode 1478e50e5129SAndreas Dilger * in the same group, or nearby one. 1479e50e5129SAndreas Dilger */ 1480e50e5129SAndreas Dilger ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, 14819e1ba001STahsin Erdogan S_IFREG | 0600, NULL, inode->i_ino + 1, owner, 14821b917ed8STahsin Erdogan EXT4_EA_INODE_FL); 1483e50e5129SAndreas Dilger if (!IS_ERR(ea_inode)) { 1484e50e5129SAndreas Dilger ea_inode->i_op = &ext4_file_inode_operations; 1485e50e5129SAndreas Dilger ea_inode->i_fop = &ext4_file_operations; 1486e50e5129SAndreas Dilger ext4_set_aops(ea_inode); 148733d201e0STahsin Erdogan ext4_xattr_inode_set_class(ea_inode); 1488e50e5129SAndreas Dilger unlock_new_inode(ea_inode); 1489dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, 1); 1490dec214d0STahsin Erdogan ext4_xattr_inode_set_hash(ea_inode, hash); 1491dec214d0STahsin Erdogan err = ext4_mark_inode_dirty(handle, ea_inode); 1492dec214d0STahsin Erdogan if (!err) 1493bd3b963bSTahsin Erdogan err = ext4_inode_attach_jinode(ea_inode); 1494bd3b963bSTahsin Erdogan if (err) { 1495e4db04f7SYe Bin if (ext4_xattr_inode_dec_ref(handle, ea_inode)) 1496e4db04f7SYe Bin ext4_warning_inode(ea_inode, 1497e4db04f7SYe Bin "cleanup dec ref error %d", err); 1498bd3b963bSTahsin Erdogan iput(ea_inode); 1499bd3b963bSTahsin Erdogan return ERR_PTR(err); 1500bd3b963bSTahsin Erdogan } 1501dec214d0STahsin Erdogan 1502dec214d0STahsin Erdogan /* 1503dec214d0STahsin Erdogan * Xattr inodes are shared therefore quota charging is performed 1504dec214d0STahsin Erdogan * at a higher level. 1505dec214d0STahsin Erdogan */ 1506dec214d0STahsin Erdogan dquot_free_inode(ea_inode); 1507dec214d0STahsin Erdogan dquot_drop(ea_inode); 1508dec214d0STahsin Erdogan inode_lock(ea_inode); 1509dec214d0STahsin Erdogan ea_inode->i_flags |= S_NOQUOTA; 1510dec214d0STahsin Erdogan inode_unlock(ea_inode); 1511e50e5129SAndreas Dilger } 1512e50e5129SAndreas Dilger 1513e50e5129SAndreas Dilger return ea_inode; 1514e50e5129SAndreas Dilger } 1515e50e5129SAndreas Dilger 1516dec214d0STahsin Erdogan static struct inode * 1517dec214d0STahsin Erdogan ext4_xattr_inode_cache_find(struct inode *inode, const void *value, 1518dec214d0STahsin Erdogan size_t value_len, u32 hash) 1519e50e5129SAndreas Dilger { 1520dec214d0STahsin Erdogan struct inode *ea_inode; 1521dec214d0STahsin Erdogan struct mb_cache_entry *ce; 1522dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 1523dec214d0STahsin Erdogan void *ea_data; 1524e50e5129SAndreas Dilger 1525cdb7ee4cSTahsin Erdogan if (!ea_inode_cache) 1526cdb7ee4cSTahsin Erdogan return NULL; 1527cdb7ee4cSTahsin Erdogan 1528dec214d0STahsin Erdogan ce = mb_cache_entry_find_first(ea_inode_cache, hash); 1529dec214d0STahsin Erdogan if (!ce) 1530dec214d0STahsin Erdogan return NULL; 1531e50e5129SAndreas Dilger 1532163f0ec1SJan Kara WARN_ON_ONCE(ext4_handle_valid(journal_current_handle()) && 1533163f0ec1SJan Kara !(current->flags & PF_MEMALLOC_NOFS)); 1534163f0ec1SJan Kara 153571b565ceSTheodore Ts'o ea_data = kvmalloc(value_len, GFP_KERNEL); 1536dec214d0STahsin Erdogan if (!ea_data) { 1537dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1538dec214d0STahsin Erdogan return NULL; 1539dec214d0STahsin Erdogan } 1540dec214d0STahsin Erdogan 1541dec214d0STahsin Erdogan while (ce) { 15428a363970STheodore Ts'o ea_inode = ext4_iget(inode->i_sb, ce->e_value, 1543b3e6bcb9STheodore Ts'o EXT4_IGET_EA_INODE); 1544b3e6bcb9STheodore Ts'o if (IS_ERR(ea_inode)) 1545b3e6bcb9STheodore Ts'o goto next_entry; 1546b928dfdcSTheodore Ts'o ext4_xattr_inode_set_class(ea_inode); 1547b3e6bcb9STheodore Ts'o if (i_size_read(ea_inode) == value_len && 1548dec214d0STahsin Erdogan !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && 1549b9fc761eSTahsin Erdogan !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, 1550dec214d0STahsin Erdogan value_len) && 1551dec214d0STahsin Erdogan !memcmp(value, ea_data, value_len)) { 1552dec214d0STahsin Erdogan mb_cache_entry_touch(ea_inode_cache, ce); 1553dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1554dec214d0STahsin Erdogan kvfree(ea_data); 1555dec214d0STahsin Erdogan return ea_inode; 1556dec214d0STahsin Erdogan } 1557e50e5129SAndreas Dilger iput(ea_inode); 1558b3e6bcb9STheodore Ts'o next_entry: 1559dec214d0STahsin Erdogan ce = mb_cache_entry_find_next(ea_inode_cache, ce); 1560dec214d0STahsin Erdogan } 1561dec214d0STahsin Erdogan kvfree(ea_data); 1562dec214d0STahsin Erdogan return NULL; 1563e50e5129SAndreas Dilger } 1564e50e5129SAndreas Dilger 1565e50e5129SAndreas Dilger /* 1566e50e5129SAndreas Dilger * Add value of the EA in an inode. 1567e50e5129SAndreas Dilger */ 1568dec214d0STahsin Erdogan static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, 1569dec214d0STahsin Erdogan const void *value, size_t value_len, 1570dec214d0STahsin Erdogan struct inode **ret_inode) 1571e50e5129SAndreas Dilger { 1572e50e5129SAndreas Dilger struct inode *ea_inode; 1573dec214d0STahsin Erdogan u32 hash; 1574e50e5129SAndreas Dilger int err; 1575e50e5129SAndreas Dilger 1576dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); 1577dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); 1578dec214d0STahsin Erdogan if (ea_inode) { 1579dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1580dec214d0STahsin Erdogan if (err) { 1581dec214d0STahsin Erdogan iput(ea_inode); 1582dec214d0STahsin Erdogan return err; 1583dec214d0STahsin Erdogan } 1584dec214d0STahsin Erdogan 1585dec214d0STahsin Erdogan *ret_inode = ea_inode; 1586dec214d0STahsin Erdogan return 0; 1587dec214d0STahsin Erdogan } 1588dec214d0STahsin Erdogan 1589e50e5129SAndreas Dilger /* Create an inode for the EA value */ 1590dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_create(handle, inode, hash); 1591e50e5129SAndreas Dilger if (IS_ERR(ea_inode)) 1592e50e5129SAndreas Dilger return PTR_ERR(ea_inode); 1593e50e5129SAndreas Dilger 1594e50e5129SAndreas Dilger err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); 1595dec214d0STahsin Erdogan if (err) { 159656d0d0b9SLi Zhong if (ext4_xattr_inode_dec_ref(handle, ea_inode)) 159756d0d0b9SLi Zhong ext4_warning_inode(ea_inode, "cleanup dec ref error %d", err); 1598e50e5129SAndreas Dilger iput(ea_inode); 1599e50e5129SAndreas Dilger return err; 1600e50e5129SAndreas Dilger } 1601e50e5129SAndreas Dilger 1602cdb7ee4cSTahsin Erdogan if (EA_INODE_CACHE(inode)) 1603dec214d0STahsin Erdogan mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, 1604dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 1605dec214d0STahsin Erdogan 1606dec214d0STahsin Erdogan *ret_inode = ea_inode; 1607dec214d0STahsin Erdogan return 0; 1608dec214d0STahsin Erdogan } 1609dec214d0STahsin Erdogan 16109c6e7853STahsin Erdogan /* 16119c6e7853STahsin Erdogan * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode 16129c6e7853STahsin Erdogan * feature is enabled. 16139c6e7853STahsin Erdogan */ 16149c6e7853STahsin Erdogan #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) 16159c6e7853STahsin Erdogan 1616e50e5129SAndreas Dilger static int ext4_xattr_set_entry(struct ext4_xattr_info *i, 1617e50e5129SAndreas Dilger struct ext4_xattr_search *s, 1618daf83281STahsin Erdogan handle_t *handle, struct inode *inode, 1619daf83281STahsin Erdogan bool is_block) 1620ac27a0ecSDave Kleikamp { 16215369a762STheodore Ts'o struct ext4_xattr_entry *last, *next; 1622dec214d0STahsin Erdogan struct ext4_xattr_entry *here = s->here; 1623dec214d0STahsin Erdogan size_t min_offs = s->end - s->base, name_len = strlen(i->name); 1624e50e5129SAndreas Dilger int in_inode = i->in_inode; 1625dec214d0STahsin Erdogan struct inode *old_ea_inode = NULL; 1626dec214d0STahsin Erdogan struct inode *new_ea_inode = NULL; 1627dec214d0STahsin Erdogan size_t old_size, new_size; 1628dec214d0STahsin Erdogan int ret; 1629dec214d0STahsin Erdogan 1630dec214d0STahsin Erdogan /* Space used by old and new values. */ 1631dec214d0STahsin Erdogan old_size = (!s->not_found && !here->e_value_inum) ? 1632dec214d0STahsin Erdogan EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; 1633dec214d0STahsin Erdogan new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; 1634dec214d0STahsin Erdogan 1635dec214d0STahsin Erdogan /* 1636dec214d0STahsin Erdogan * Optimization for the simple case when old and new values have the 1637dec214d0STahsin Erdogan * same padded sizes. Not applicable if external inodes are involved. 1638dec214d0STahsin Erdogan */ 1639dec214d0STahsin Erdogan if (new_size && new_size == old_size) { 1640dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1641dec214d0STahsin Erdogan void *val = s->base + offs; 1642dec214d0STahsin Erdogan 1643dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1644dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1645dec214d0STahsin Erdogan memset(val, 0, new_size); 1646dec214d0STahsin Erdogan } else { 1647dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1648dec214d0STahsin Erdogan /* Clear padding bytes. */ 1649dec214d0STahsin Erdogan memset(val + i->value_len, 0, new_size - i->value_len); 1650dec214d0STahsin Erdogan } 165132aaf194STahsin Erdogan goto update_hash; 1652dec214d0STahsin Erdogan } 1653e50e5129SAndreas Dilger 1654ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 1655ac27a0ecSDave Kleikamp last = s->first; 16565369a762STheodore Ts'o for (; !IS_LAST_ENTRY(last); last = next) { 16575369a762STheodore Ts'o next = EXT4_XATTR_NEXT(last); 16585369a762STheodore Ts'o if ((void *)next >= s->end) { 16595369a762STheodore Ts'o EXT4_ERROR_INODE(inode, "corrupted xattr entries"); 16605369a762STheodore Ts'o ret = -EFSCORRUPTED; 16615369a762STheodore Ts'o goto out; 16625369a762STheodore Ts'o } 1663e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 1664ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 1665ac27a0ecSDave Kleikamp if (offs < min_offs) 1666ac27a0ecSDave Kleikamp min_offs = offs; 1667ac27a0ecSDave Kleikamp } 1668ac27a0ecSDave Kleikamp } 1669dec214d0STahsin Erdogan 1670dec214d0STahsin Erdogan /* Check whether we have enough space. */ 1671ac27a0ecSDave Kleikamp if (i->value) { 1672dec214d0STahsin Erdogan size_t free; 1673e50e5129SAndreas Dilger 1674dec214d0STahsin Erdogan free = min_offs - ((void *)last - s->base) - sizeof(__u32); 1675dec214d0STahsin Erdogan if (!s->not_found) 1676dec214d0STahsin Erdogan free += EXT4_XATTR_LEN(name_len) + old_size; 1677e50e5129SAndreas Dilger 1678dec214d0STahsin Erdogan if (free < EXT4_XATTR_LEN(name_len) + new_size) { 1679dec214d0STahsin Erdogan ret = -ENOSPC; 1680dec214d0STahsin Erdogan goto out; 1681dec214d0STahsin Erdogan } 16829c6e7853STahsin Erdogan 16839c6e7853STahsin Erdogan /* 16849c6e7853STahsin Erdogan * If storing the value in an external inode is an option, 16859c6e7853STahsin Erdogan * reserve space for xattr entries/names in the external 16869c6e7853STahsin Erdogan * attribute block so that a long value does not occupy the 16873088e5a5SBhaskar Chowdhury * whole space and prevent further entries being added. 16889c6e7853STahsin Erdogan */ 1689daf83281STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 1690daf83281STahsin Erdogan new_size && is_block && 16919c6e7853STahsin Erdogan (min_offs + old_size - new_size) < 16929c6e7853STahsin Erdogan EXT4_XATTR_BLOCK_RESERVE(inode)) { 16939c6e7853STahsin Erdogan ret = -ENOSPC; 16949c6e7853STahsin Erdogan goto out; 16959c6e7853STahsin Erdogan } 1696ac27a0ecSDave Kleikamp } 1697ac27a0ecSDave Kleikamp 1698dec214d0STahsin Erdogan /* 1699dec214d0STahsin Erdogan * Getting access to old and new ea inodes is subject to failures. 1700dec214d0STahsin Erdogan * Finish that work before doing any modifications to the xattr data. 1701dec214d0STahsin Erdogan */ 1702dec214d0STahsin Erdogan if (!s->not_found && here->e_value_inum) { 1703dec214d0STahsin Erdogan ret = ext4_xattr_inode_iget(inode, 1704dec214d0STahsin Erdogan le32_to_cpu(here->e_value_inum), 1705a6d05676STahsin Erdogan le32_to_cpu(here->e_hash), 1706dec214d0STahsin Erdogan &old_ea_inode); 1707dec214d0STahsin Erdogan if (ret) { 1708dec214d0STahsin Erdogan old_ea_inode = NULL; 1709dec214d0STahsin Erdogan goto out; 1710bd9926e8STheodore Ts'o } 1711dec214d0STahsin Erdogan } 1712dec214d0STahsin Erdogan if (i->value && in_inode) { 1713dec214d0STahsin Erdogan WARN_ON_ONCE(!i->value_len); 1714dec214d0STahsin Erdogan 1715dec214d0STahsin Erdogan ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); 1716dec214d0STahsin Erdogan if (ret) 1717dec214d0STahsin Erdogan goto out; 1718dec214d0STahsin Erdogan 1719dec214d0STahsin Erdogan ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, 1720dec214d0STahsin Erdogan i->value_len, 1721dec214d0STahsin Erdogan &new_ea_inode); 1722dec214d0STahsin Erdogan if (ret) { 1723dec214d0STahsin Erdogan new_ea_inode = NULL; 1724a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, NULL, i->value_len); 1725dec214d0STahsin Erdogan goto out; 1726dec214d0STahsin Erdogan } 1727ac27a0ecSDave Kleikamp } 1728ac27a0ecSDave Kleikamp 1729dec214d0STahsin Erdogan if (old_ea_inode) { 1730dec214d0STahsin Erdogan /* We are ready to release ref count on the old_ea_inode. */ 1731dec214d0STahsin Erdogan ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); 1732dec214d0STahsin Erdogan if (ret) { 1733dec214d0STahsin Erdogan /* Release newly required ref count on new_ea_inode. */ 1734dec214d0STahsin Erdogan if (new_ea_inode) { 1735dec214d0STahsin Erdogan int err; 1736dec214d0STahsin Erdogan 1737dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, 1738dec214d0STahsin Erdogan new_ea_inode); 1739dec214d0STahsin Erdogan if (err) 1740dec214d0STahsin Erdogan ext4_warning_inode(new_ea_inode, 1741dec214d0STahsin Erdogan "dec ref new_ea_inode err=%d", 1742dec214d0STahsin Erdogan err); 1743a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, new_ea_inode, 1744dec214d0STahsin Erdogan i->value_len); 1745dec214d0STahsin Erdogan } 1746dec214d0STahsin Erdogan goto out; 1747dec214d0STahsin Erdogan } 1748dec214d0STahsin Erdogan 1749a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, old_ea_inode, 1750dec214d0STahsin Erdogan le32_to_cpu(here->e_value_size)); 1751dec214d0STahsin Erdogan } 1752dec214d0STahsin Erdogan 1753dec214d0STahsin Erdogan /* No failures allowed past this point. */ 1754dec214d0STahsin Erdogan 1755e5d01196STheodore Ts'o if (!s->not_found && here->e_value_size && !here->e_value_inum) { 1756ac27a0ecSDave Kleikamp /* Remove the old value. */ 1757dec214d0STahsin Erdogan void *first_val = s->base + min_offs; 1758dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1759dec214d0STahsin Erdogan void *val = s->base + offs; 1760dec214d0STahsin Erdogan 1761dec214d0STahsin Erdogan memmove(first_val + old_size, first_val, val - first_val); 1762dec214d0STahsin Erdogan memset(first_val, 0, old_size); 1763dec214d0STahsin Erdogan min_offs += old_size; 1764ac27a0ecSDave Kleikamp 1765ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 1766ac27a0ecSDave Kleikamp last = s->first; 1767ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 1768ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 1769dec214d0STahsin Erdogan 1770e50e5129SAndreas Dilger if (!last->e_value_inum && 1771e50e5129SAndreas Dilger last->e_value_size && o < offs) 1772dec214d0STahsin Erdogan last->e_value_offs = cpu_to_le16(o + old_size); 1773617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 1774ac27a0ecSDave Kleikamp } 1775ac27a0ecSDave Kleikamp } 1776dec214d0STahsin Erdogan 1777ac27a0ecSDave Kleikamp if (!i->value) { 1778dec214d0STahsin Erdogan /* Remove old name. */ 1779617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 1780dec214d0STahsin Erdogan 1781ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 1782dec214d0STahsin Erdogan memmove(here, (void *)here + size, 1783dec214d0STahsin Erdogan (void *)last - (void *)here + sizeof(__u32)); 1784ac27a0ecSDave Kleikamp memset(last, 0, size); 17856909cf5cSEric Whitney 17866909cf5cSEric Whitney /* 17876909cf5cSEric Whitney * Update i_inline_off - moved ibody region might contain 17886909cf5cSEric Whitney * system.data attribute. Handling a failure here won't 17896909cf5cSEric Whitney * cause other complications for setting an xattr. 17906909cf5cSEric Whitney */ 17916909cf5cSEric Whitney if (!is_block && ext4_has_inline_data(inode)) { 17926909cf5cSEric Whitney ret = ext4_find_inline_data_nolock(inode); 17936909cf5cSEric Whitney if (ret) { 17946909cf5cSEric Whitney ext4_warning_inode(inode, 17956909cf5cSEric Whitney "unable to update i_inline_off"); 17966909cf5cSEric Whitney goto out; 17976909cf5cSEric Whitney } 17986909cf5cSEric Whitney } 1799dec214d0STahsin Erdogan } else if (s->not_found) { 1800dec214d0STahsin Erdogan /* Insert new name. */ 1801dec214d0STahsin Erdogan size_t size = EXT4_XATTR_LEN(name_len); 1802dec214d0STahsin Erdogan size_t rest = (void *)last - (void *)here + sizeof(__u32); 1803dec214d0STahsin Erdogan 1804dec214d0STahsin Erdogan memmove((void *)here + size, here, rest); 1805dec214d0STahsin Erdogan memset(here, 0, size); 1806dec214d0STahsin Erdogan here->e_name_index = i->name_index; 1807dec214d0STahsin Erdogan here->e_name_len = name_len; 1808dec214d0STahsin Erdogan memcpy(here->e_name, i->name, name_len); 1809dec214d0STahsin Erdogan } else { 1810dec214d0STahsin Erdogan /* This is an update, reset value info. */ 1811dec214d0STahsin Erdogan here->e_value_inum = 0; 1812dec214d0STahsin Erdogan here->e_value_offs = 0; 1813dec214d0STahsin Erdogan here->e_value_size = 0; 1814ac27a0ecSDave Kleikamp } 1815ac27a0ecSDave Kleikamp 1816ac27a0ecSDave Kleikamp if (i->value) { 1817dec214d0STahsin Erdogan /* Insert new value. */ 1818e50e5129SAndreas Dilger if (in_inode) { 1819dec214d0STahsin Erdogan here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); 1820e50e5129SAndreas Dilger } else if (i->value_len) { 1821dec214d0STahsin Erdogan void *val = s->base + min_offs - new_size; 1822e50e5129SAndreas Dilger 1823dec214d0STahsin Erdogan here->e_value_offs = cpu_to_le16(min_offs - new_size); 1824dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1825dec214d0STahsin Erdogan memset(val, 0, new_size); 1826dec214d0STahsin Erdogan } else { 1827dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1828dec214d0STahsin Erdogan /* Clear padding bytes. */ 1829dec214d0STahsin Erdogan memset(val + i->value_len, 0, 1830dec214d0STahsin Erdogan new_size - i->value_len); 1831dec214d0STahsin Erdogan } 1832dec214d0STahsin Erdogan } 1833dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1834dec214d0STahsin Erdogan } 1835daf83281STahsin Erdogan 183632aaf194STahsin Erdogan update_hash: 1837b9fc761eSTahsin Erdogan if (i->value) { 1838b9fc761eSTahsin Erdogan __le32 hash = 0; 1839b9fc761eSTahsin Erdogan 1840b9fc761eSTahsin Erdogan /* Entry hash calculation. */ 1841b9fc761eSTahsin Erdogan if (in_inode) { 1842b9fc761eSTahsin Erdogan __le32 crc32c_hash; 1843b9fc761eSTahsin Erdogan 1844b9fc761eSTahsin Erdogan /* 1845b9fc761eSTahsin Erdogan * Feed crc32c hash instead of the raw value for entry 1846b9fc761eSTahsin Erdogan * hash calculation. This is to avoid walking 1847b9fc761eSTahsin Erdogan * potentially long value buffer again. 1848b9fc761eSTahsin Erdogan */ 1849b9fc761eSTahsin Erdogan crc32c_hash = cpu_to_le32( 1850b9fc761eSTahsin Erdogan ext4_xattr_inode_get_hash(new_ea_inode)); 1851b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1852b9fc761eSTahsin Erdogan here->e_name_len, 1853b9fc761eSTahsin Erdogan &crc32c_hash, 1); 1854b9fc761eSTahsin Erdogan } else if (is_block) { 185532aaf194STahsin Erdogan __le32 *value = s->base + le16_to_cpu( 185632aaf194STahsin Erdogan here->e_value_offs); 1857b9fc761eSTahsin Erdogan 1858b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1859b9fc761eSTahsin Erdogan here->e_name_len, value, 1860b9fc761eSTahsin Erdogan new_size >> 2); 1861daf83281STahsin Erdogan } 1862b9fc761eSTahsin Erdogan here->e_hash = hash; 1863b9fc761eSTahsin Erdogan } 1864b9fc761eSTahsin Erdogan 1865b9fc761eSTahsin Erdogan if (is_block) 1866b9fc761eSTahsin Erdogan ext4_xattr_rehash((struct ext4_xattr_header *)s->base); 1867daf83281STahsin Erdogan 1868dec214d0STahsin Erdogan ret = 0; 1869e50e5129SAndreas Dilger out: 1870dec214d0STahsin Erdogan iput(old_ea_inode); 1871dec214d0STahsin Erdogan iput(new_ea_inode); 1872dec214d0STahsin Erdogan return ret; 1873ac27a0ecSDave Kleikamp } 1874ac27a0ecSDave Kleikamp 1875617ba13bSMingming Cao struct ext4_xattr_block_find { 1876617ba13bSMingming Cao struct ext4_xattr_search s; 1877ac27a0ecSDave Kleikamp struct buffer_head *bh; 1878ac27a0ecSDave Kleikamp }; 1879ac27a0ecSDave Kleikamp 1880ac27a0ecSDave Kleikamp static int 1881617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 1882617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1883ac27a0ecSDave Kleikamp { 1884ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1885ac27a0ecSDave Kleikamp int error; 1886ac27a0ecSDave Kleikamp 1887ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 1888ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 1889ac27a0ecSDave Kleikamp 1890617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 1891ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 1892fb265c9cSTheodore Ts'o bs->bh = ext4_sb_bread(sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 18938418897fSJeffle Xu if (IS_ERR(bs->bh)) { 18948418897fSJeffle Xu error = PTR_ERR(bs->bh); 18958418897fSJeffle Xu bs->bh = NULL; 18968418897fSJeffle Xu return error; 18978418897fSJeffle Xu } 1898ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 1899ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 1900ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 1901de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bs->bh); 1902de05ca85STheodore Ts'o if (error) 1903fb265c9cSTheodore Ts'o return error; 1904ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1905ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 1906ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 1907ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 1908ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 19099496005dSTheodore Ts'o error = xattr_find_entry(inode, &bs->s.here, bs->s.end, 19109496005dSTheodore Ts'o i->name_index, i->name, 1); 1911ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1912fb265c9cSTheodore Ts'o return error; 1913ac27a0ecSDave Kleikamp bs->s.not_found = error; 1914ac27a0ecSDave Kleikamp } 1915fb265c9cSTheodore Ts'o return 0; 1916ac27a0ecSDave Kleikamp } 1917ac27a0ecSDave Kleikamp 1918ac27a0ecSDave Kleikamp static int 1919617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 1920617ba13bSMingming Cao struct ext4_xattr_info *i, 1921617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1922ac27a0ecSDave Kleikamp { 1923ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1924ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 1925b347e2bcSTahsin Erdogan struct ext4_xattr_search s_copy = bs->s; 1926b347e2bcSTahsin Erdogan struct ext4_xattr_search *s = &s_copy; 19277a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 19288a2bfdcbSMingming Cao int error = 0; 192947387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 1930a6d05676STahsin Erdogan struct inode *ea_inode = NULL, *tmp_inode; 1931a6d05676STahsin Erdogan size_t old_ea_inode_quota = 0; 1932a6d05676STahsin Erdogan unsigned int ea_ino; 1933a6d05676STahsin Erdogan 1934ac27a0ecSDave Kleikamp 1935617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 1936ac27a0ecSDave Kleikamp 1937ac27a0ecSDave Kleikamp if (s->base) { 1938fd48e9acSJan Kara int offset = (char *)s->here - bs->bh->b_data; 1939fd48e9acSJan Kara 19405d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 1941188c299eSJan Kara error = ext4_journal_get_write_access(handle, sb, bs->bh, 1942188c299eSJan Kara EXT4_JTR_NONE); 19438a2bfdcbSMingming Cao if (error) 19448a2bfdcbSMingming Cao goto cleanup; 19458a2bfdcbSMingming Cao lock_buffer(bs->bh); 19468a2bfdcbSMingming Cao 1947ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 194882939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 194982939d79SJan Kara 195082939d79SJan Kara /* 195182939d79SJan Kara * This must happen under buffer lock for 195282939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 195382939d79SJan Kara * block 195482939d79SJan Kara */ 195565f8b800SJan Kara if (ea_block_cache) { 195665f8b800SJan Kara struct mb_cache_entry *oe; 195765f8b800SJan Kara 195865f8b800SJan Kara oe = mb_cache_entry_delete_or_get(ea_block_cache, 195965f8b800SJan Kara hash, bs->bh->b_blocknr); 196065f8b800SJan Kara if (oe) { 196165f8b800SJan Kara /* 196265f8b800SJan Kara * Xattr block is getting reused. Leave 196365f8b800SJan Kara * it alone. 196465f8b800SJan Kara */ 196565f8b800SJan Kara mb_cache_entry_put(ea_block_cache, oe); 196665f8b800SJan Kara goto clone_block; 196765f8b800SJan Kara } 196865f8b800SJan Kara } 1969ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 1970daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 1971daf83281STahsin Erdogan true /* is_block */); 1972dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bs->bh); 1973ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 19746a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1975ac27a0ecSDave Kleikamp goto bad_block; 1976ac27a0ecSDave Kleikamp if (!error) 1977dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 19780390131bSFrank Mayhar inode, 1979ac27a0ecSDave Kleikamp bs->bh); 1980ac27a0ecSDave Kleikamp if (error) 1981ac27a0ecSDave Kleikamp goto cleanup; 1982ac27a0ecSDave Kleikamp goto inserted; 1983fd48e9acSJan Kara } 198465f8b800SJan Kara clone_block: 19858a2bfdcbSMingming Cao unlock_buffer(bs->bh); 1986ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 19874efd9f0dSShuqi Zhang s->base = kmemdup(BHDR(bs->bh), bs->bh->b_size, GFP_NOFS); 1988ac27a0ecSDave Kleikamp error = -ENOMEM; 1989ac27a0ecSDave Kleikamp if (s->base == NULL) 1990ac27a0ecSDave Kleikamp goto cleanup; 1991ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1992ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1993ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 1994ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 1995dec214d0STahsin Erdogan 1996dec214d0STahsin Erdogan /* 1997dec214d0STahsin Erdogan * If existing entry points to an xattr inode, we need 1998dec214d0STahsin Erdogan * to prevent ext4_xattr_set_entry() from decrementing 1999dec214d0STahsin Erdogan * ref count on it because the reference belongs to the 2000dec214d0STahsin Erdogan * original block. In this case, make the entry look 2001dec214d0STahsin Erdogan * like it has an empty value. 2002dec214d0STahsin Erdogan */ 2003dec214d0STahsin Erdogan if (!s->not_found && s->here->e_value_inum) { 2004a6d05676STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 2005a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, 2006a6d05676STahsin Erdogan le32_to_cpu(s->here->e_hash), 2007a6d05676STahsin Erdogan &tmp_inode); 2008a6d05676STahsin Erdogan if (error) 2009a6d05676STahsin Erdogan goto cleanup; 2010a6d05676STahsin Erdogan 2011a6d05676STahsin Erdogan if (!ext4_test_inode_state(tmp_inode, 2012a6d05676STahsin Erdogan EXT4_STATE_LUSTRE_EA_INODE)) { 2013dec214d0STahsin Erdogan /* 2014a6d05676STahsin Erdogan * Defer quota free call for previous 2015a6d05676STahsin Erdogan * inode until success is guaranteed. 2016dec214d0STahsin Erdogan */ 2017a6d05676STahsin Erdogan old_ea_inode_quota = le32_to_cpu( 2018dec214d0STahsin Erdogan s->here->e_value_size); 2019a6d05676STahsin Erdogan } 2020a6d05676STahsin Erdogan iput(tmp_inode); 2021a6d05676STahsin Erdogan 2022dec214d0STahsin Erdogan s->here->e_value_inum = 0; 2023dec214d0STahsin Erdogan s->here->e_value_size = 0; 2024dec214d0STahsin Erdogan } 2025ac27a0ecSDave Kleikamp } else { 2026ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 2027216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 2028ac27a0ecSDave Kleikamp error = -ENOMEM; 2029ac27a0ecSDave Kleikamp if (s->base == NULL) 2030ac27a0ecSDave Kleikamp goto cleanup; 2031617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 2032ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 2033ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 2034ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 2035ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 2036ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 2037ac27a0ecSDave Kleikamp } 2038ac27a0ecSDave Kleikamp 2039daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); 20406a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 2041ac27a0ecSDave Kleikamp goto bad_block; 2042ac27a0ecSDave Kleikamp if (error) 2043ac27a0ecSDave Kleikamp goto cleanup; 2044dec214d0STahsin Erdogan 2045dec214d0STahsin Erdogan if (i->value && s->here->e_value_inum) { 2046dec214d0STahsin Erdogan /* 2047dec214d0STahsin Erdogan * A ref count on ea_inode has been taken as part of the call to 2048dec214d0STahsin Erdogan * ext4_xattr_set_entry() above. We would like to drop this 2049dec214d0STahsin Erdogan * extra ref but we have to wait until the xattr block is 2050dec214d0STahsin Erdogan * initialized and has its own ref count on the ea_inode. 2051dec214d0STahsin Erdogan */ 2052dec214d0STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 2053a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, 2054a6d05676STahsin Erdogan le32_to_cpu(s->here->e_hash), 2055a6d05676STahsin Erdogan &ea_inode); 2056dec214d0STahsin Erdogan if (error) { 2057dec214d0STahsin Erdogan ea_inode = NULL; 2058dec214d0STahsin Erdogan goto cleanup; 2059dec214d0STahsin Erdogan } 2060dec214d0STahsin Erdogan } 2061dec214d0STahsin Erdogan 2062ac27a0ecSDave Kleikamp inserted: 2063ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 206447387409STahsin Erdogan new_bh = ext4_xattr_block_cache_find(inode, header(s->base), 206547387409STahsin Erdogan &ce); 2066ac27a0ecSDave Kleikamp if (new_bh) { 2067ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 2068ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 2069ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 2070ac27a0ecSDave Kleikamp else { 20716048c64bSAndreas Gruenbacher u32 ref; 20726048c64bSAndreas Gruenbacher 2073dea9d8f7STheodore Ts'o #ifdef EXT4_XATTR_DEBUG 2074b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 2075dea9d8f7STheodore Ts'o #endif 2076ac27a0ecSDave Kleikamp /* The old block is released after updating 2077ac27a0ecSDave Kleikamp the inode. */ 20781231b3a1SLukas Czerner error = dquot_alloc_block(inode, 20791231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 20805dd4056dSChristoph Hellwig if (error) 2081ac27a0ecSDave Kleikamp goto cleanup; 20825d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 2083188c299eSJan Kara error = ext4_journal_get_write_access( 2084188c299eSJan Kara handle, sb, new_bh, 2085188c299eSJan Kara EXT4_JTR_NONE); 2086ac27a0ecSDave Kleikamp if (error) 2087ac27a0ecSDave Kleikamp goto cleanup_dquot; 2088ac27a0ecSDave Kleikamp lock_buffer(new_bh); 208982939d79SJan Kara /* 209082939d79SJan Kara * We have to be careful about races with 209165f8b800SJan Kara * adding references to xattr block. Once we 209265f8b800SJan Kara * hold buffer lock xattr block's state is 209365f8b800SJan Kara * stable so we can check the additional 209465f8b800SJan Kara * reference fits. 209582939d79SJan Kara */ 209665f8b800SJan Kara ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 209765f8b800SJan Kara if (ref > EXT4_XATTR_REFCOUNT_MAX) { 209882939d79SJan Kara /* 209982939d79SJan Kara * Undo everything and check mbcache 210082939d79SJan Kara * again. 210182939d79SJan Kara */ 210282939d79SJan Kara unlock_buffer(new_bh); 210382939d79SJan Kara dquot_free_block(inode, 210482939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 210582939d79SJan Kara 1)); 210682939d79SJan Kara brelse(new_bh); 210747387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 210882939d79SJan Kara ce = NULL; 210982939d79SJan Kara new_bh = NULL; 211082939d79SJan Kara goto inserted; 211182939d79SJan Kara } 21126048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 211365f8b800SJan Kara if (ref == EXT4_XATTR_REFCOUNT_MAX) 2114a44e84a9SJan Kara clear_bit(MBE_REUSABLE_B, &ce->e_flags); 2115ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 21166048c64bSAndreas Gruenbacher ref); 2117dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2118ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2119dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 21200390131bSFrank Mayhar inode, 2121ac27a0ecSDave Kleikamp new_bh); 2122ac27a0ecSDave Kleikamp if (error) 2123ac27a0ecSDave Kleikamp goto cleanup_dquot; 2124ac27a0ecSDave Kleikamp } 212547387409STahsin Erdogan mb_cache_entry_touch(ea_block_cache, ce); 212647387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2127ac27a0ecSDave Kleikamp ce = NULL; 2128ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 2129ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 2130ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 2131ec000220STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); 2132ac27a0ecSDave Kleikamp new_bh = bs->bh; 2133ac27a0ecSDave Kleikamp get_bh(new_bh); 2134ac27a0ecSDave Kleikamp } else { 2135ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 2136fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 2137fb0a387dSEric Sandeen 2138dea9d8f7STheodore Ts'o #ifdef EXT4_XATTR_DEBUG 2139b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 2140dea9d8f7STheodore Ts'o #endif 2141fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 2142d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 214355f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 214455f020dbSAllison Henderson NULL, &error); 2145ac27a0ecSDave Kleikamp if (error) 2146ac27a0ecSDave Kleikamp goto cleanup; 2147fb0a387dSEric Sandeen 2148ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 2149ace36ad4SJoe Perches (unsigned long long)block); 2150ac27a0ecSDave Kleikamp 2151ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 2152aebf0243SWang Shilong if (unlikely(!new_bh)) { 2153860d21e2STheodore Ts'o error = -ENOMEM; 2154ac27a0ecSDave Kleikamp getblk_failed: 21557dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 2156e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 2157ac27a0ecSDave Kleikamp goto cleanup; 2158ac27a0ecSDave Kleikamp } 2159dec214d0STahsin Erdogan error = ext4_xattr_inode_inc_ref_all(handle, inode, 2160dec214d0STahsin Erdogan ENTRY(header(s->base)+1)); 2161dec214d0STahsin Erdogan if (error) 2162dec214d0STahsin Erdogan goto getblk_failed; 2163dec214d0STahsin Erdogan if (ea_inode) { 2164dec214d0STahsin Erdogan /* Drop the extra ref on ea_inode. */ 2165dec214d0STahsin Erdogan error = ext4_xattr_inode_dec_ref(handle, 2166dec214d0STahsin Erdogan ea_inode); 2167dec214d0STahsin Erdogan if (error) 2168dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 2169dec214d0STahsin Erdogan "dec ref error=%d", 2170dec214d0STahsin Erdogan error); 2171dec214d0STahsin Erdogan iput(ea_inode); 2172dec214d0STahsin Erdogan ea_inode = NULL; 2173dec214d0STahsin Erdogan } 2174dec214d0STahsin Erdogan 2175ac27a0ecSDave Kleikamp lock_buffer(new_bh); 2176188c299eSJan Kara error = ext4_journal_get_create_access(handle, sb, 2177188c299eSJan Kara new_bh, EXT4_JTR_NONE); 2178ac27a0ecSDave Kleikamp if (error) { 2179ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2180860d21e2STheodore Ts'o error = -EIO; 2181ac27a0ecSDave Kleikamp goto getblk_failed; 2182ac27a0ecSDave Kleikamp } 2183ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 2184dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2185ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 2186ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 218747387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, new_bh); 2188dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, 2189dac7a4b4STheodore Ts'o new_bh); 2190ac27a0ecSDave Kleikamp if (error) 2191ac27a0ecSDave Kleikamp goto cleanup; 2192ac27a0ecSDave Kleikamp } 2193ac27a0ecSDave Kleikamp } 2194ac27a0ecSDave Kleikamp 2195a6d05676STahsin Erdogan if (old_ea_inode_quota) 2196a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, NULL, old_ea_inode_quota); 2197dec214d0STahsin Erdogan 2198ac27a0ecSDave Kleikamp /* Update the inode. */ 2199617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 2200ac27a0ecSDave Kleikamp 2201ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 2202dec214d0STahsin Erdogan if (bs->bh && bs->bh != new_bh) { 2203dec214d0STahsin Erdogan struct ext4_xattr_inode_array *ea_inode_array = NULL; 2204dec214d0STahsin Erdogan 2205dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bs->bh, 2206dec214d0STahsin Erdogan &ea_inode_array, 2207dec214d0STahsin Erdogan 0 /* extra_credits */); 2208dec214d0STahsin Erdogan ext4_xattr_inode_array_free(ea_inode_array); 2209dec214d0STahsin Erdogan } 2210ac27a0ecSDave Kleikamp error = 0; 2211ac27a0ecSDave Kleikamp 2212ac27a0ecSDave Kleikamp cleanup: 2213dec214d0STahsin Erdogan if (ea_inode) { 2214dec214d0STahsin Erdogan int error2; 2215dec214d0STahsin Erdogan 2216dec214d0STahsin Erdogan error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); 2217dec214d0STahsin Erdogan if (error2) 2218dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "dec ref error=%d", 2219dec214d0STahsin Erdogan error2); 2220dec214d0STahsin Erdogan 2221dec214d0STahsin Erdogan /* If there was an error, revert the quota charge. */ 2222dec214d0STahsin Erdogan if (error) 2223a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, ea_inode, 2224dec214d0STahsin Erdogan i_size_read(ea_inode)); 2225dec214d0STahsin Erdogan iput(ea_inode); 2226dec214d0STahsin Erdogan } 2227ac27a0ecSDave Kleikamp if (ce) 222847387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2229ac27a0ecSDave Kleikamp brelse(new_bh); 2230ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 2231ac27a0ecSDave Kleikamp kfree(s->base); 2232ac27a0ecSDave Kleikamp 2233ac27a0ecSDave Kleikamp return error; 2234ac27a0ecSDave Kleikamp 2235ac27a0ecSDave Kleikamp cleanup_dquot: 22361231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 2237ac27a0ecSDave Kleikamp goto cleanup; 2238ac27a0ecSDave Kleikamp 2239ac27a0ecSDave Kleikamp bad_block: 224024676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 224124676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2242ac27a0ecSDave Kleikamp goto cleanup; 2243ac27a0ecSDave Kleikamp 2244ac27a0ecSDave Kleikamp #undef header 2245ac27a0ecSDave Kleikamp } 2246ac27a0ecSDave Kleikamp 2247879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 2248617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2249ac27a0ecSDave Kleikamp { 2250617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2251617ba13bSMingming Cao struct ext4_inode *raw_inode; 2252ac27a0ecSDave Kleikamp int error; 2253ac27a0ecSDave Kleikamp 225467d7d8adSBaokun Li if (!EXT4_INODE_HAS_XATTR_SPACE(inode)) 2255ac27a0ecSDave Kleikamp return 0; 225667d7d8adSBaokun Li 2257617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 2258ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 2259ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 2260ac27a0ecSDave Kleikamp is->s.here = is->s.first; 2261617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 226219f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 22639e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 2264ac27a0ecSDave Kleikamp if (error) 2265ac27a0ecSDave Kleikamp return error; 2266ac27a0ecSDave Kleikamp /* Find the named attribute. */ 22679496005dSTheodore Ts'o error = xattr_find_entry(inode, &is->s.here, is->s.end, 22689496005dSTheodore Ts'o i->name_index, i->name, 0); 2269ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 2270ac27a0ecSDave Kleikamp return error; 2271ac27a0ecSDave Kleikamp is->s.not_found = error; 2272ac27a0ecSDave Kleikamp } 2273ac27a0ecSDave Kleikamp return 0; 2274ac27a0ecSDave Kleikamp } 2275ac27a0ecSDave Kleikamp 2276310c097cSRitesh Harjani int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 2277617ba13bSMingming Cao struct ext4_xattr_info *i, 2278617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2279ac27a0ecSDave Kleikamp { 2280617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2281617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 2282ac27a0ecSDave Kleikamp int error; 2283ac27a0ecSDave Kleikamp 228467d7d8adSBaokun Li if (!EXT4_INODE_HAS_XATTR_SPACE(inode)) 2285ac27a0ecSDave Kleikamp return -ENOSPC; 228667d7d8adSBaokun Li 2287daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 2288ac27a0ecSDave Kleikamp if (error) 2289ac27a0ecSDave Kleikamp return error; 2290617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 2291ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 2292617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 229319f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 2294ac27a0ecSDave Kleikamp } else { 2295ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 229619f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 2297ac27a0ecSDave Kleikamp } 2298ac27a0ecSDave Kleikamp return 0; 2299ac27a0ecSDave Kleikamp } 2300ac27a0ecSDave Kleikamp 23013fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 23023fd16462SJan Kara struct ext4_xattr_info *i) 23033fd16462SJan Kara { 23043fd16462SJan Kara void *value; 23053fd16462SJan Kara 23060bd454c0STahsin Erdogan /* When e_value_inum is set the value is stored externally. */ 23070bd454c0STahsin Erdogan if (s->here->e_value_inum) 23080bd454c0STahsin Erdogan return 0; 23093fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 23103fd16462SJan Kara return 0; 23113fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 23123fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 23133fd16462SJan Kara } 23143fd16462SJan Kara 2315dec214d0STahsin Erdogan static struct buffer_head *ext4_xattr_get_block(struct inode *inode) 2316dec214d0STahsin Erdogan { 2317dec214d0STahsin Erdogan struct buffer_head *bh; 2318dec214d0STahsin Erdogan int error; 2319dec214d0STahsin Erdogan 2320dec214d0STahsin Erdogan if (!EXT4_I(inode)->i_file_acl) 2321dec214d0STahsin Erdogan return NULL; 2322fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2323fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 2324fb265c9cSTheodore Ts'o return bh; 2325dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2326ecaaf408SVasily Averin if (error) { 2327ecaaf408SVasily Averin brelse(bh); 2328dec214d0STahsin Erdogan return ERR_PTR(error); 2329ecaaf408SVasily Averin } 2330dec214d0STahsin Erdogan return bh; 2331dec214d0STahsin Erdogan } 2332dec214d0STahsin Erdogan 2333ac27a0ecSDave Kleikamp /* 2334617ba13bSMingming Cao * ext4_xattr_set_handle() 2335ac27a0ecSDave Kleikamp * 23366e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 2337ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 2338ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 2339ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 2340ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 2341ac27a0ecSDave Kleikamp * previous to the call, respectively. 2342ac27a0ecSDave Kleikamp * 2343ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2344ac27a0ecSDave Kleikamp */ 2345ac27a0ecSDave Kleikamp int 2346617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 2347ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 2348ac27a0ecSDave Kleikamp int flags) 2349ac27a0ecSDave Kleikamp { 2350617ba13bSMingming Cao struct ext4_xattr_info i = { 2351ac27a0ecSDave Kleikamp .name_index = name_index, 2352ac27a0ecSDave Kleikamp .name = name, 2353ac27a0ecSDave Kleikamp .value = value, 2354ac27a0ecSDave Kleikamp .value_len = value_len, 2355e50e5129SAndreas Dilger .in_inode = 0, 2356ac27a0ecSDave Kleikamp }; 2357617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 2358ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2359ac27a0ecSDave Kleikamp }; 2360617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 2361ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2362ac27a0ecSDave Kleikamp }; 2363c755e251STheodore Ts'o int no_expand; 2364ac27a0ecSDave Kleikamp int error; 2365ac27a0ecSDave Kleikamp 2366ac27a0ecSDave Kleikamp if (!name) 2367ac27a0ecSDave Kleikamp return -EINVAL; 2368ac27a0ecSDave Kleikamp if (strlen(name) > 255) 2369ac27a0ecSDave Kleikamp return -ERANGE; 2370b8cb5a54STahsin Erdogan 2371c755e251STheodore Ts'o ext4_write_lock_xattr(inode, &no_expand); 23724d20c685SKalpak Shah 2373c1a5d5f6STahsin Erdogan /* Check journal credits under write lock. */ 2374c1a5d5f6STahsin Erdogan if (ext4_handle_valid(handle)) { 2375dec214d0STahsin Erdogan struct buffer_head *bh; 2376c1a5d5f6STahsin Erdogan int credits; 2377c1a5d5f6STahsin Erdogan 2378dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2379dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2380dec214d0STahsin Erdogan error = PTR_ERR(bh); 2381dec214d0STahsin Erdogan goto cleanup; 2382dec214d0STahsin Erdogan } 2383dec214d0STahsin Erdogan 2384af65207cSTahsin Erdogan credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2385af65207cSTahsin Erdogan value_len, 2386af65207cSTahsin Erdogan flags & XATTR_CREATE); 2387dec214d0STahsin Erdogan brelse(bh); 2388dec214d0STahsin Erdogan 2389a9a8344eSJan Kara if (jbd2_handle_buffer_credits(handle) < credits) { 2390c1a5d5f6STahsin Erdogan error = -ENOSPC; 2391c1a5d5f6STahsin Erdogan goto cleanup; 2392c1a5d5f6STahsin Erdogan } 2393163f0ec1SJan Kara WARN_ON_ONCE(!(current->flags & PF_MEMALLOC_NOFS)); 2394c1a5d5f6STahsin Erdogan } 2395c1a5d5f6STahsin Erdogan 239666543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 239786ebfd08SEric Sandeen if (error) 239886ebfd08SEric Sandeen goto cleanup; 239986ebfd08SEric Sandeen 240019f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 2401617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 2402617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 240319f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 2404ac27a0ecSDave Kleikamp } 2405ac27a0ecSDave Kleikamp 2406617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 2407ac27a0ecSDave Kleikamp if (error) 2408ac27a0ecSDave Kleikamp goto cleanup; 2409ac27a0ecSDave Kleikamp if (is.s.not_found) 2410617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 2411ac27a0ecSDave Kleikamp if (error) 2412ac27a0ecSDave Kleikamp goto cleanup; 2413ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 2414ac27a0ecSDave Kleikamp error = -ENODATA; 2415ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 2416ac27a0ecSDave Kleikamp goto cleanup; 2417ac27a0ecSDave Kleikamp error = 0; 2418ac27a0ecSDave Kleikamp if (!value) 2419ac27a0ecSDave Kleikamp goto cleanup; 2420ac27a0ecSDave Kleikamp } else { 2421ac27a0ecSDave Kleikamp error = -EEXIST; 2422ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 2423ac27a0ecSDave Kleikamp goto cleanup; 2424ac27a0ecSDave Kleikamp } 2425dec214d0STahsin Erdogan 2426ac27a0ecSDave Kleikamp if (!value) { 2427ac27a0ecSDave Kleikamp if (!is.s.not_found) 2428e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2429ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 2430617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2431ac27a0ecSDave Kleikamp } else { 24323fd16462SJan Kara error = 0; 24333fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 24343fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 24353fd16462SJan Kara goto cleanup; 24363fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 24373fd16462SJan Kara goto cleanup; 24383fd16462SJan Kara 2439b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2440b347e2bcSTahsin Erdogan (EXT4_XATTR_SIZE(i.value_len) > 2441b347e2bcSTahsin Erdogan EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) 2442b347e2bcSTahsin Erdogan i.in_inode = 1; 2443b347e2bcSTahsin Erdogan retry_inode: 2444e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2445ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 2446ac27a0ecSDave Kleikamp i.value = NULL; 2447617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2448ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 24497e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 245045ae932dSVasily Averin brelse(bs.bh); 245145ae932dSVasily Averin bs.bh = NULL; 24527e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 24537e01c8e5STiger Yang if (error) 24547e01c8e5STiger Yang goto cleanup; 24557e01c8e5STiger Yang } 2456617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2457b347e2bcSTahsin Erdogan if (!error && !is.s.not_found) { 2458ac27a0ecSDave Kleikamp i.value = NULL; 2459e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, 2460e50e5129SAndreas Dilger &is); 2461b347e2bcSTahsin Erdogan } else if (error == -ENOSPC) { 2462b347e2bcSTahsin Erdogan /* 2463b347e2bcSTahsin Erdogan * Xattr does not fit in the block, store at 2464b347e2bcSTahsin Erdogan * external inode if possible. 2465b347e2bcSTahsin Erdogan */ 2466b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 24676b224899Szhangyi (F) i.value_len && !i.in_inode) { 2468b347e2bcSTahsin Erdogan i.in_inode = 1; 2469b347e2bcSTahsin Erdogan goto retry_inode; 2470b347e2bcSTahsin Erdogan } 2471ac27a0ecSDave Kleikamp } 2472ac27a0ecSDave Kleikamp } 2473ac27a0ecSDave Kleikamp } 2474ac27a0ecSDave Kleikamp if (!error) { 2475617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 24761bc33893SJeff Layton inode_set_ctime_current(inode); 2477a642c2c0SJeff Layton inode_inc_iversion(inode); 24786dd4ee7cSKalpak Shah if (!value) 2479c755e251STheodore Ts'o no_expand = 0; 2480617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 2481ac27a0ecSDave Kleikamp /* 2482617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 2483ac27a0ecSDave Kleikamp * error != 0. 2484ac27a0ecSDave Kleikamp */ 2485ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 2486ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 24870390131bSFrank Mayhar ext4_handle_sync(handle); 2488ac27a0ecSDave Kleikamp } 2489e85c81baSXin Yin ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, handle); 2490ac27a0ecSDave Kleikamp 2491ac27a0ecSDave Kleikamp cleanup: 2492ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 2493ac27a0ecSDave Kleikamp brelse(bs.bh); 2494c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 2495ac27a0ecSDave Kleikamp return error; 2496ac27a0ecSDave Kleikamp } 2497ac27a0ecSDave Kleikamp 2498af65207cSTahsin Erdogan int ext4_xattr_set_credits(struct inode *inode, size_t value_len, 2499af65207cSTahsin Erdogan bool is_create, int *credits) 2500c1a5d5f6STahsin Erdogan { 2501dec214d0STahsin Erdogan struct buffer_head *bh; 2502dec214d0STahsin Erdogan int err; 2503c1a5d5f6STahsin Erdogan 2504dec214d0STahsin Erdogan *credits = 0; 2505dec214d0STahsin Erdogan 2506dec214d0STahsin Erdogan if (!EXT4_SB(inode->i_sb)->s_journal) 2507c1a5d5f6STahsin Erdogan return 0; 2508c1a5d5f6STahsin Erdogan 2509dec214d0STahsin Erdogan down_read(&EXT4_I(inode)->xattr_sem); 2510c1a5d5f6STahsin Erdogan 2511dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2512dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2513dec214d0STahsin Erdogan err = PTR_ERR(bh); 2514dec214d0STahsin Erdogan } else { 2515af65207cSTahsin Erdogan *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2516af65207cSTahsin Erdogan value_len, is_create); 2517dec214d0STahsin Erdogan brelse(bh); 2518dec214d0STahsin Erdogan err = 0; 2519c1a5d5f6STahsin Erdogan } 2520dec214d0STahsin Erdogan 2521dec214d0STahsin Erdogan up_read(&EXT4_I(inode)->xattr_sem); 2522dec214d0STahsin Erdogan return err; 2523c1a5d5f6STahsin Erdogan } 2524c1a5d5f6STahsin Erdogan 2525ac27a0ecSDave Kleikamp /* 2526617ba13bSMingming Cao * ext4_xattr_set() 2527ac27a0ecSDave Kleikamp * 2528617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 2529ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 2530ac27a0ecSDave Kleikamp * 2531ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2532ac27a0ecSDave Kleikamp */ 2533ac27a0ecSDave Kleikamp int 2534617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 2535ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 2536ac27a0ecSDave Kleikamp { 2537ac27a0ecSDave Kleikamp handle_t *handle; 2538e50e5129SAndreas Dilger struct super_block *sb = inode->i_sb; 2539ac27a0ecSDave Kleikamp int error, retries = 0; 2540c1a5d5f6STahsin Erdogan int credits; 2541ac27a0ecSDave Kleikamp 2542b8cb5a54STahsin Erdogan error = dquot_initialize(inode); 2543b8cb5a54STahsin Erdogan if (error) 2544b8cb5a54STahsin Erdogan return error; 2545e50e5129SAndreas Dilger 2546ac27a0ecSDave Kleikamp retry: 2547af65207cSTahsin Erdogan error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, 2548af65207cSTahsin Erdogan &credits); 2549dec214d0STahsin Erdogan if (error) 2550dec214d0STahsin Erdogan return error; 2551dec214d0STahsin Erdogan 25529924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 2553ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 2554ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 2555ac27a0ecSDave Kleikamp } else { 2556ac27a0ecSDave Kleikamp int error2; 2557ac27a0ecSDave Kleikamp 2558617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 2559ac27a0ecSDave Kleikamp value, value_len, flags); 2560617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 2561ac27a0ecSDave Kleikamp if (error == -ENOSPC && 2562e50e5129SAndreas Dilger ext4_should_retry_alloc(sb, &retries)) 2563ac27a0ecSDave Kleikamp goto retry; 2564ac27a0ecSDave Kleikamp if (error == 0) 2565ac27a0ecSDave Kleikamp error = error2; 2566ac27a0ecSDave Kleikamp } 2567e85c81baSXin Yin ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, NULL); 2568ac27a0ecSDave Kleikamp 2569ac27a0ecSDave Kleikamp return error; 2570ac27a0ecSDave Kleikamp } 2571ac27a0ecSDave Kleikamp 2572ac27a0ecSDave Kleikamp /* 25736dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 25746dd4ee7cSKalpak Shah * i_extra_isize. 25756dd4ee7cSKalpak Shah */ 25766dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 25776dd4ee7cSKalpak Shah int value_offs_shift, void *to, 257894405713SJan Kara void *from, size_t n) 25796dd4ee7cSKalpak Shah { 25806dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 25816dd4ee7cSKalpak Shah int new_offs; 25826dd4ee7cSKalpak Shah 258394405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 258494405713SJan Kara BUG_ON(value_offs_shift > 0); 258594405713SJan Kara 25866dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 25876dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 2588e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 25896dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 25906dd4ee7cSKalpak Shah value_offs_shift; 25916dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 25926dd4ee7cSKalpak Shah } 25936dd4ee7cSKalpak Shah } 25946dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 25956dd4ee7cSKalpak Shah memmove(to, from, n); 25966dd4ee7cSKalpak Shah } 25976dd4ee7cSKalpak Shah 25986dd4ee7cSKalpak Shah /* 25993f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 26003f2571c1SJan Kara */ 26013f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 26023f2571c1SJan Kara struct ext4_inode *raw_inode, 26033f2571c1SJan Kara struct ext4_xattr_entry *entry) 26043f2571c1SJan Kara { 26053f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 26063f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 26073f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 2608f6109100STahsin Erdogan size_t value_size = le32_to_cpu(entry->e_value_size); 26093f2571c1SJan Kara struct ext4_xattr_info i = { 26103f2571c1SJan Kara .value = NULL, 26113f2571c1SJan Kara .value_len = 0, 26123f2571c1SJan Kara .name_index = entry->e_name_index, 2613f6109100STahsin Erdogan .in_inode = !!entry->e_value_inum, 26143f2571c1SJan Kara }; 26153f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 2616b87c7cdfSTheodore Ts'o int needs_kvfree = 0; 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 } 2639b87c7cdfSTheodore Ts'o needs_kvfree = 1; 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); 2678b87c7cdfSTheodore Ts'o if (needs_kvfree && 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 28542b96b4a5SYe Bin if (ext4_has_inline_data(inode)) 28552b96b4a5SYe Bin error = ext4_find_inline_data_nolock(inode); 28562b96b4a5SYe Bin 28576dd4ee7cSKalpak Shah cleanup: 2858b640b2c5SMiao Xie if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) { 2859cf0a5e81SMiao Xie ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", 2860cf0a5e81SMiao Xie inode->i_ino); 2861cf0a5e81SMiao Xie mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); 2862cf0a5e81SMiao Xie } 28636dd4ee7cSKalpak Shah return error; 28646dd4ee7cSKalpak Shah } 28656dd4ee7cSKalpak Shah 2866e50e5129SAndreas Dilger #define EIA_INCR 16 /* must be 2^n */ 2867e50e5129SAndreas Dilger #define EIA_MASK (EIA_INCR - 1) 2868dec214d0STahsin Erdogan 2869dec214d0STahsin Erdogan /* Add the large xattr @inode into @ea_inode_array for deferred iput(). 28700421a189STahsin Erdogan * If @ea_inode_array is new or full it will be grown and the old 2871e50e5129SAndreas Dilger * contents copied over. 2872e50e5129SAndreas Dilger */ 2873e50e5129SAndreas Dilger static int 28740421a189STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 28750421a189STahsin Erdogan struct inode *inode) 2876e50e5129SAndreas Dilger { 28770421a189STahsin Erdogan if (*ea_inode_array == NULL) { 2878e50e5129SAndreas Dilger /* 2879e50e5129SAndreas Dilger * Start with 15 inodes, so it fits into a power-of-two size. 28800421a189STahsin Erdogan * If *ea_inode_array is NULL, this is essentially offsetof() 2881e50e5129SAndreas Dilger */ 28820421a189STahsin Erdogan (*ea_inode_array) = 28830421a189STahsin Erdogan kmalloc(offsetof(struct ext4_xattr_inode_array, 28840421a189STahsin Erdogan inodes[EIA_MASK]), 2885e50e5129SAndreas Dilger GFP_NOFS); 28860421a189STahsin Erdogan if (*ea_inode_array == NULL) 2887e50e5129SAndreas Dilger return -ENOMEM; 28880421a189STahsin Erdogan (*ea_inode_array)->count = 0; 28890421a189STahsin Erdogan } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { 2890e50e5129SAndreas Dilger /* expand the array once all 15 + n * 16 slots are full */ 28910421a189STahsin Erdogan struct ext4_xattr_inode_array *new_array = NULL; 28920421a189STahsin Erdogan int count = (*ea_inode_array)->count; 2893e50e5129SAndreas Dilger 2894e50e5129SAndreas Dilger /* if new_array is NULL, this is essentially offsetof() */ 2895e50e5129SAndreas Dilger new_array = kmalloc( 28960421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, 28970421a189STahsin Erdogan inodes[count + EIA_INCR]), 2898e50e5129SAndreas Dilger GFP_NOFS); 2899e50e5129SAndreas Dilger if (new_array == NULL) 2900e50e5129SAndreas Dilger return -ENOMEM; 29010421a189STahsin Erdogan memcpy(new_array, *ea_inode_array, 29020421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, inodes[count])); 29030421a189STahsin Erdogan kfree(*ea_inode_array); 29040421a189STahsin Erdogan *ea_inode_array = new_array; 2905e50e5129SAndreas Dilger } 29060421a189STahsin Erdogan (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; 2907e50e5129SAndreas Dilger return 0; 2908e50e5129SAndreas Dilger } 2909e50e5129SAndreas Dilger 29106dd4ee7cSKalpak Shah /* 2911617ba13bSMingming Cao * ext4_xattr_delete_inode() 2912ac27a0ecSDave Kleikamp * 2913e50e5129SAndreas Dilger * Free extended attribute resources associated with this inode. Traverse 2914dec214d0STahsin Erdogan * all entries and decrement reference on any xattr inodes associated with this 2915dec214d0STahsin Erdogan * inode. This is called immediately before an inode is freed. We have exclusive 2916dec214d0STahsin Erdogan * access to the inode. If an orphan inode is deleted it will also release its 2917dec214d0STahsin Erdogan * references on xattr block and xattr inodes. 2918ac27a0ecSDave Kleikamp */ 2919dec214d0STahsin Erdogan int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, 292030a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 292130a7eb97STahsin Erdogan int extra_credits) 2922ac27a0ecSDave Kleikamp { 2923ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 2924e50e5129SAndreas Dilger struct ext4_xattr_ibody_header *header; 292530a7eb97STahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 2926dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 2927a6d05676STahsin Erdogan struct inode *ea_inode; 292830a7eb97STahsin Erdogan int error; 292930a7eb97STahsin Erdogan 293083448bdfSJan Kara error = ext4_journal_ensure_credits(handle, extra_credits, 293183448bdfSJan Kara ext4_free_metadata_revoke_credits(inode->i_sb, 1)); 2932a4130367SJan Kara if (error < 0) { 293330a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); 293430a7eb97STahsin Erdogan goto cleanup; 293530a7eb97STahsin Erdogan } 2936ac27a0ecSDave Kleikamp 2937dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2938dec214d0STahsin Erdogan ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 2939e50e5129SAndreas Dilger 2940e50e5129SAndreas Dilger error = ext4_get_inode_loc(inode, &iloc); 2941dec214d0STahsin Erdogan if (error) { 2942dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); 2943e50e5129SAndreas Dilger goto cleanup; 2944e50e5129SAndreas Dilger } 2945dec214d0STahsin Erdogan 2946188c299eSJan Kara error = ext4_journal_get_write_access(handle, inode->i_sb, 2947188c299eSJan Kara iloc.bh, EXT4_JTR_NONE); 2948dec214d0STahsin Erdogan if (error) { 2949dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "write access (error %d)", 2950dec214d0STahsin Erdogan error); 2951dec214d0STahsin Erdogan goto cleanup; 2952dec214d0STahsin Erdogan } 2953dec214d0STahsin Erdogan 2954dec214d0STahsin Erdogan header = IHDR(inode, ext4_raw_inode(&iloc)); 2955dec214d0STahsin Erdogan if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) 2956dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, 2957dec214d0STahsin Erdogan IFIRST(header), 2958dec214d0STahsin Erdogan false /* block_csum */, 2959dec214d0STahsin Erdogan ea_inode_array, 2960dec214d0STahsin Erdogan extra_credits, 2961dec214d0STahsin Erdogan false /* skip_quota */); 2962dec214d0STahsin Erdogan } 2963dec214d0STahsin Erdogan 2964dec214d0STahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 2965fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2966fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 2967fb265c9cSTheodore Ts'o error = PTR_ERR(bh); 2968878520acSTheodore Ts'o if (error == -EIO) { 296954d3adbcSTheodore Ts'o EXT4_ERROR_INODE_ERR(inode, EIO, 297054d3adbcSTheodore Ts'o "block %llu read error", 297124676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2972878520acSTheodore Ts'o } 29737159a986SDan Carpenter bh = NULL; 2974ac27a0ecSDave Kleikamp goto cleanup; 2975ac27a0ecSDave Kleikamp } 2976dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2977de05ca85STheodore Ts'o if (error) 2978ac27a0ecSDave Kleikamp goto cleanup; 2979e50e5129SAndreas Dilger 298030a7eb97STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) { 2981dec214d0STahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 2982a6d05676STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 2983a6d05676STahsin Erdogan if (!entry->e_value_inum) 2984a6d05676STahsin Erdogan continue; 2985a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, 2986a6d05676STahsin Erdogan le32_to_cpu(entry->e_value_inum), 2987a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 2988a6d05676STahsin Erdogan &ea_inode); 2989a6d05676STahsin Erdogan if (error) 2990a6d05676STahsin Erdogan continue; 2991a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, ea_inode, 2992dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 2993a6d05676STahsin Erdogan iput(ea_inode); 2994a6d05676STahsin Erdogan } 2995dec214d0STahsin Erdogan 2996e50e5129SAndreas Dilger } 2997e50e5129SAndreas Dilger 2998dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bh, ea_inode_array, 2999dec214d0STahsin Erdogan extra_credits); 3000dec214d0STahsin Erdogan /* 3001dec214d0STahsin Erdogan * Update i_file_acl value in the same transaction that releases 3002dec214d0STahsin Erdogan * block. 3003dec214d0STahsin Erdogan */ 3004617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 300530a7eb97STahsin Erdogan error = ext4_mark_inode_dirty(handle, inode); 300630a7eb97STahsin Erdogan if (error) { 300730a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", 300830a7eb97STahsin Erdogan error); 300930a7eb97STahsin Erdogan goto cleanup; 301030a7eb97STahsin Erdogan } 3011e85c81baSXin Yin ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, handle); 3012dec214d0STahsin Erdogan } 3013dec214d0STahsin Erdogan error = 0; 3014ac27a0ecSDave Kleikamp cleanup: 301530a7eb97STahsin Erdogan brelse(iloc.bh); 3016ac27a0ecSDave Kleikamp brelse(bh); 3017e50e5129SAndreas Dilger return error; 3018e50e5129SAndreas Dilger } 3019e50e5129SAndreas Dilger 30200421a189STahsin Erdogan void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) 3021e50e5129SAndreas Dilger { 3022dec214d0STahsin Erdogan int idx; 3023e50e5129SAndreas Dilger 30240421a189STahsin Erdogan if (ea_inode_array == NULL) 3025e50e5129SAndreas Dilger return; 3026e50e5129SAndreas Dilger 3027dec214d0STahsin Erdogan for (idx = 0; idx < ea_inode_array->count; ++idx) 3028dec214d0STahsin Erdogan iput(ea_inode_array->inodes[idx]); 30290421a189STahsin Erdogan kfree(ea_inode_array); 3030ac27a0ecSDave Kleikamp } 3031ac27a0ecSDave Kleikamp 3032ac27a0ecSDave Kleikamp /* 303347387409STahsin Erdogan * ext4_xattr_block_cache_insert() 3034ac27a0ecSDave Kleikamp * 303547387409STahsin Erdogan * Create a new entry in the extended attribute block cache, and insert 3036ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 3037ac27a0ecSDave Kleikamp * 3038ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 3039ac27a0ecSDave Kleikamp */ 3040ac27a0ecSDave Kleikamp static void 304147387409STahsin Erdogan ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, 304247387409STahsin Erdogan struct buffer_head *bh) 3043ac27a0ecSDave Kleikamp { 30446048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 30456048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 30466048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 30476048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 3048ac27a0ecSDave Kleikamp int error; 3049ac27a0ecSDave Kleikamp 3050cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 3051cdb7ee4cSTahsin Erdogan return; 305247387409STahsin Erdogan error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, 30536048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 3054ac27a0ecSDave Kleikamp if (error) { 305582939d79SJan Kara if (error == -EBUSY) 3056ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 305782939d79SJan Kara } else 3058ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 3059ac27a0ecSDave Kleikamp } 3060ac27a0ecSDave Kleikamp 3061ac27a0ecSDave Kleikamp /* 3062617ba13bSMingming Cao * ext4_xattr_cmp() 3063ac27a0ecSDave Kleikamp * 3064ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 3065ac27a0ecSDave Kleikamp * 3066ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 3067ac27a0ecSDave Kleikamp * a negative error number on errors. 3068ac27a0ecSDave Kleikamp */ 3069ac27a0ecSDave Kleikamp static int 3070617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 3071617ba13bSMingming Cao struct ext4_xattr_header *header2) 3072ac27a0ecSDave Kleikamp { 3073617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 3074ac27a0ecSDave Kleikamp 3075ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 3076ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 3077ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 3078ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 3079ac27a0ecSDave Kleikamp return 1; 3080ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 3081ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 3082ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 3083ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 3084e50e5129SAndreas Dilger entry1->e_value_inum != entry2->e_value_inum || 3085ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 3086ac27a0ecSDave Kleikamp return 1; 30877cec1918STahsin Erdogan if (!entry1->e_value_inum && 30887cec1918STahsin Erdogan memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 3089ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 3090ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 3091ac27a0ecSDave Kleikamp return 1; 3092ac27a0ecSDave Kleikamp 3093617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 3094617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 3095ac27a0ecSDave Kleikamp } 3096ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 3097ac27a0ecSDave Kleikamp return 1; 3098ac27a0ecSDave Kleikamp return 0; 3099ac27a0ecSDave Kleikamp } 3100ac27a0ecSDave Kleikamp 3101ac27a0ecSDave Kleikamp /* 310247387409STahsin Erdogan * ext4_xattr_block_cache_find() 3103ac27a0ecSDave Kleikamp * 3104ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 3105ac27a0ecSDave Kleikamp * 3106ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 3107ac27a0ecSDave Kleikamp * not found or an error occurred. 3108ac27a0ecSDave Kleikamp */ 3109ac27a0ecSDave Kleikamp static struct buffer_head * 311047387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *inode, 311147387409STahsin Erdogan struct ext4_xattr_header *header, 31127a2508e1SJan Kara struct mb_cache_entry **pce) 3113ac27a0ecSDave Kleikamp { 3114ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 31157a2508e1SJan Kara struct mb_cache_entry *ce; 311647387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 3117ac27a0ecSDave Kleikamp 3118cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 3119cdb7ee4cSTahsin Erdogan return NULL; 3120ac27a0ecSDave Kleikamp if (!header->h_hash) 3121ac27a0ecSDave Kleikamp return NULL; /* never share */ 3122ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 312347387409STahsin Erdogan ce = mb_cache_entry_find_first(ea_block_cache, hash); 3124ac27a0ecSDave Kleikamp while (ce) { 3125ac27a0ecSDave Kleikamp struct buffer_head *bh; 3126ac27a0ecSDave Kleikamp 3127fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, ce->e_value, REQ_PRIO); 3128fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 3129*a95df6f0SBaokun Li if (PTR_ERR(bh) == -ENOMEM) { 3130*a95df6f0SBaokun Li mb_cache_entry_put(ea_block_cache, ce); 3131fb265c9cSTheodore Ts'o return NULL; 3132*a95df6f0SBaokun Li } 31337159a986SDan Carpenter bh = NULL; 313424676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 3135c07dfcb4STahsin Erdogan (unsigned long)ce->e_value); 3136617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 3137ac27a0ecSDave Kleikamp *pce = ce; 3138ac27a0ecSDave Kleikamp return bh; 3139ac27a0ecSDave Kleikamp } 3140ac27a0ecSDave Kleikamp brelse(bh); 314147387409STahsin Erdogan ce = mb_cache_entry_find_next(ea_block_cache, ce); 3142ac27a0ecSDave Kleikamp } 3143ac27a0ecSDave Kleikamp return NULL; 3144ac27a0ecSDave Kleikamp } 3145ac27a0ecSDave Kleikamp 3146ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 3147ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 3148ac27a0ecSDave Kleikamp 3149ac27a0ecSDave Kleikamp /* 3150617ba13bSMingming Cao * ext4_xattr_hash_entry() 3151ac27a0ecSDave Kleikamp * 3152ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 3153ac27a0ecSDave Kleikamp */ 3154b9fc761eSTahsin Erdogan static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, 3155b9fc761eSTahsin Erdogan size_t value_count) 3156ac27a0ecSDave Kleikamp { 3157ac27a0ecSDave Kleikamp __u32 hash = 0; 3158ac27a0ecSDave Kleikamp 3159b9fc761eSTahsin Erdogan while (name_len--) { 3160ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 3161ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 3162854f0912SLinus Torvalds (unsigned char)*name++; 3163ac27a0ecSDave Kleikamp } 3164b9fc761eSTahsin Erdogan while (value_count--) { 3165ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 3166ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 3167ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 3168ac27a0ecSDave Kleikamp } 3169b9fc761eSTahsin Erdogan return cpu_to_le32(hash); 3170ac27a0ecSDave Kleikamp } 3171ac27a0ecSDave Kleikamp 3172f3bbac32SLinus Torvalds /* 3173f3bbac32SLinus Torvalds * ext4_xattr_hash_entry_signed() 3174f3bbac32SLinus Torvalds * 3175f3bbac32SLinus Torvalds * Compute the hash of an extended attribute incorrectly. 3176f3bbac32SLinus Torvalds */ 3177f3bbac32SLinus Torvalds static __le32 ext4_xattr_hash_entry_signed(char *name, size_t name_len, __le32 *value, size_t value_count) 3178f3bbac32SLinus Torvalds { 3179f3bbac32SLinus Torvalds __u32 hash = 0; 3180f3bbac32SLinus Torvalds 3181f3bbac32SLinus Torvalds while (name_len--) { 3182f3bbac32SLinus Torvalds hash = (hash << NAME_HASH_SHIFT) ^ 3183f3bbac32SLinus Torvalds (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 3184f3bbac32SLinus Torvalds (signed char)*name++; 3185f3bbac32SLinus Torvalds } 3186f3bbac32SLinus Torvalds while (value_count--) { 3187f3bbac32SLinus Torvalds hash = (hash << VALUE_HASH_SHIFT) ^ 3188f3bbac32SLinus Torvalds (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 3189f3bbac32SLinus Torvalds le32_to_cpu(*value++); 3190f3bbac32SLinus Torvalds } 3191f3bbac32SLinus Torvalds return cpu_to_le32(hash); 3192f3bbac32SLinus Torvalds } 3193f3bbac32SLinus Torvalds 3194ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 3195ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 3196ac27a0ecSDave Kleikamp 3197ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 3198ac27a0ecSDave Kleikamp 3199ac27a0ecSDave Kleikamp /* 3200617ba13bSMingming Cao * ext4_xattr_rehash() 3201ac27a0ecSDave Kleikamp * 3202ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 3203ac27a0ecSDave Kleikamp */ 3204daf83281STahsin Erdogan static void ext4_xattr_rehash(struct ext4_xattr_header *header) 3205ac27a0ecSDave Kleikamp { 3206617ba13bSMingming Cao struct ext4_xattr_entry *here; 3207ac27a0ecSDave Kleikamp __u32 hash = 0; 3208ac27a0ecSDave Kleikamp 3209ac27a0ecSDave Kleikamp here = ENTRY(header+1); 3210ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 3211ac27a0ecSDave Kleikamp if (!here->e_hash) { 3212ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 3213ac27a0ecSDave Kleikamp hash = 0; 3214ac27a0ecSDave Kleikamp break; 3215ac27a0ecSDave Kleikamp } 3216ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 3217ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 3218ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 3219617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 3220ac27a0ecSDave Kleikamp } 3221ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 3222ac27a0ecSDave Kleikamp } 3223ac27a0ecSDave Kleikamp 3224ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 3225ac27a0ecSDave Kleikamp 32269c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 32279c191f70ST Makphaibulchoke 32287a2508e1SJan Kara struct mb_cache * 322982939d79SJan Kara ext4_xattr_create_cache(void) 3230ac27a0ecSDave Kleikamp { 32317a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 3232ac27a0ecSDave Kleikamp } 3233ac27a0ecSDave Kleikamp 32347a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 3235ac27a0ecSDave Kleikamp { 32369c191f70ST Makphaibulchoke if (cache) 32377a2508e1SJan Kara mb_cache_destroy(cache); 3238ac27a0ecSDave Kleikamp } 32399c191f70ST Makphaibulchoke 3240