1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 2ac27a0ecSDave Kleikamp /* 3617ba13bSMingming Cao * linux/fs/ext4/xattr.c 4ac27a0ecSDave Kleikamp * 5ac27a0ecSDave Kleikamp * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> 6ac27a0ecSDave Kleikamp * 7ac27a0ecSDave Kleikamp * Fix by Harrison Xing <harrison@mountainviewdata.com>. 8617ba13bSMingming Cao * Ext4 code with a lot of help from Eric Jarman <ejarman@acm.org>. 9ac27a0ecSDave Kleikamp * Extended attributes for symlinks and special files added per 10ac27a0ecSDave Kleikamp * suggestion of Luka Renko <luka.renko@hermes.si>. 11ac27a0ecSDave Kleikamp * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>, 12ac27a0ecSDave Kleikamp * Red Hat Inc. 13ac27a0ecSDave Kleikamp * ea-in-inode support by Alex Tomas <alex@clusterfs.com> aka bzzz 14ac27a0ecSDave Kleikamp * and Andreas Gruenbacher <agruen@suse.de>. 15ac27a0ecSDave Kleikamp */ 16ac27a0ecSDave Kleikamp 17ac27a0ecSDave Kleikamp /* 18ac27a0ecSDave Kleikamp * Extended attributes are stored directly in inodes (on file systems with 19ac27a0ecSDave Kleikamp * inodes bigger than 128 bytes) and on additional disk blocks. The i_file_acl 20ac27a0ecSDave Kleikamp * field contains the block number if an inode uses an additional block. All 21ac27a0ecSDave Kleikamp * attributes must fit in the inode and one additional block. Blocks that 22ac27a0ecSDave Kleikamp * contain the identical set of attributes may be shared among several inodes. 23ac27a0ecSDave Kleikamp * Identical blocks are detected by keeping a cache of blocks that have 24ac27a0ecSDave Kleikamp * recently been accessed. 25ac27a0ecSDave Kleikamp * 26ac27a0ecSDave Kleikamp * The attributes in inodes and on blocks have a different header; the entries 27ac27a0ecSDave Kleikamp * are stored in the same format: 28ac27a0ecSDave Kleikamp * 29ac27a0ecSDave Kleikamp * +------------------+ 30ac27a0ecSDave Kleikamp * | header | 31ac27a0ecSDave Kleikamp * | entry 1 | | 32ac27a0ecSDave Kleikamp * | entry 2 | | growing downwards 33ac27a0ecSDave Kleikamp * | entry 3 | v 34ac27a0ecSDave Kleikamp * | four null bytes | 35ac27a0ecSDave Kleikamp * | . . . | 36ac27a0ecSDave Kleikamp * | value 1 | ^ 37ac27a0ecSDave Kleikamp * | value 3 | | growing upwards 38ac27a0ecSDave Kleikamp * | value 2 | | 39ac27a0ecSDave Kleikamp * +------------------+ 40ac27a0ecSDave Kleikamp * 41ac27a0ecSDave Kleikamp * The header is followed by multiple entry descriptors. In disk blocks, the 42ac27a0ecSDave Kleikamp * entry descriptors are kept sorted. In inodes, they are unsorted. The 43ac27a0ecSDave Kleikamp * attribute values are aligned to the end of the block in no specific order. 44ac27a0ecSDave Kleikamp * 45ac27a0ecSDave Kleikamp * Locking strategy 46ac27a0ecSDave Kleikamp * ---------------- 47617ba13bSMingming Cao * EXT4_I(inode)->i_file_acl is protected by EXT4_I(inode)->xattr_sem. 48ac27a0ecSDave Kleikamp * EA blocks are only changed if they are exclusive to an inode, so 49ac27a0ecSDave Kleikamp * holding xattr_sem also means that nothing but the EA block's reference 50ac27a0ecSDave Kleikamp * count can change. Multiple writers to the same block are synchronized 51ac27a0ecSDave Kleikamp * by the buffer lock. 52ac27a0ecSDave Kleikamp */ 53ac27a0ecSDave Kleikamp 54ac27a0ecSDave Kleikamp #include <linux/init.h> 55ac27a0ecSDave Kleikamp #include <linux/fs.h> 56ac27a0ecSDave Kleikamp #include <linux/slab.h> 577a2508e1SJan Kara #include <linux/mbcache.h> 58ac27a0ecSDave Kleikamp #include <linux/quotaops.h> 59ee73f9a5SJeff Layton #include <linux/iversion.h> 603dcf5451SChristoph Hellwig #include "ext4_jbd2.h" 613dcf5451SChristoph Hellwig #include "ext4.h" 62ac27a0ecSDave Kleikamp #include "xattr.h" 63ac27a0ecSDave Kleikamp #include "acl.h" 64ac27a0ecSDave Kleikamp 65617ba13bSMingming Cao #ifdef EXT4_XATTR_DEBUG 66d74f3d25SJoe Perches # define ea_idebug(inode, fmt, ...) \ 67d74f3d25SJoe Perches printk(KERN_DEBUG "inode %s:%lu: " fmt "\n", \ 68d74f3d25SJoe Perches inode->i_sb->s_id, inode->i_ino, ##__VA_ARGS__) 69d74f3d25SJoe Perches # define ea_bdebug(bh, fmt, ...) \ 70d74f3d25SJoe Perches printk(KERN_DEBUG "block %pg:%lu: " fmt "\n", \ 71d74f3d25SJoe Perches bh->b_bdev, (unsigned long)bh->b_blocknr, ##__VA_ARGS__) 72ac27a0ecSDave Kleikamp #else 73ace36ad4SJoe Perches # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 74ace36ad4SJoe Perches # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 75ac27a0ecSDave Kleikamp #endif 76ac27a0ecSDave Kleikamp 7747387409STahsin Erdogan static void ext4_xattr_block_cache_insert(struct mb_cache *, 7847387409STahsin Erdogan struct buffer_head *); 7947387409STahsin Erdogan static struct buffer_head * 8047387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *, struct ext4_xattr_header *, 817a2508e1SJan Kara struct mb_cache_entry **); 82b9fc761eSTahsin Erdogan static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, 83b9fc761eSTahsin Erdogan size_t value_count); 84daf83281STahsin Erdogan static void ext4_xattr_rehash(struct ext4_xattr_header *); 85ac27a0ecSDave Kleikamp 86d6006186SEric Biggers static const struct xattr_handler * const ext4_xattr_handler_map[] = { 87617ba13bSMingming Cao [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, 8803010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 8964e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, 9064e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, 91ac27a0ecSDave Kleikamp #endif 92617ba13bSMingming Cao [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, 9303010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 94617ba13bSMingming Cao [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, 95ac27a0ecSDave Kleikamp #endif 9688ee9d57SJan (janneke) Nieuwenhuizen [EXT4_XATTR_INDEX_HURD] = &ext4_xattr_hurd_handler, 97ac27a0ecSDave Kleikamp }; 98ac27a0ecSDave Kleikamp 9911e27528SStephen Hemminger const struct xattr_handler *ext4_xattr_handlers[] = { 100617ba13bSMingming Cao &ext4_xattr_user_handler, 101617ba13bSMingming Cao &ext4_xattr_trusted_handler, 10203010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 10364e178a7SChristoph Hellwig &posix_acl_access_xattr_handler, 10464e178a7SChristoph Hellwig &posix_acl_default_xattr_handler, 105ac27a0ecSDave Kleikamp #endif 10603010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 107617ba13bSMingming Cao &ext4_xattr_security_handler, 108ac27a0ecSDave Kleikamp #endif 10988ee9d57SJan (janneke) Nieuwenhuizen &ext4_xattr_hurd_handler, 110ac27a0ecSDave Kleikamp NULL 111ac27a0ecSDave Kleikamp }; 112ac27a0ecSDave Kleikamp 11347387409STahsin Erdogan #define EA_BLOCK_CACHE(inode) (((struct ext4_sb_info *) \ 11447387409STahsin Erdogan inode->i_sb->s_fs_info)->s_ea_block_cache) 1159c191f70ST Makphaibulchoke 116dec214d0STahsin Erdogan #define EA_INODE_CACHE(inode) (((struct ext4_sb_info *) \ 117dec214d0STahsin Erdogan inode->i_sb->s_fs_info)->s_ea_inode_cache) 118dec214d0STahsin Erdogan 11930a7eb97STahsin Erdogan static int 12030a7eb97STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 12130a7eb97STahsin Erdogan struct inode *inode); 12230a7eb97STahsin Erdogan 12333d201e0STahsin Erdogan #ifdef CONFIG_LOCKDEP 12433d201e0STahsin Erdogan void ext4_xattr_inode_set_class(struct inode *ea_inode) 12533d201e0STahsin Erdogan { 12633d201e0STahsin Erdogan lockdep_set_subclass(&ea_inode->i_rwsem, 1); 12733d201e0STahsin Erdogan } 12833d201e0STahsin Erdogan #endif 12933d201e0STahsin Erdogan 130cc8e94fdSDarrick J. Wong static __le32 ext4_xattr_block_csum(struct inode *inode, 131cc8e94fdSDarrick J. Wong sector_t block_nr, 132cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 133cc8e94fdSDarrick J. Wong { 134cc8e94fdSDarrick J. Wong struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 135d6a77105STheodore Ts'o __u32 csum; 136d6a77105STheodore Ts'o __le64 dsk_block_nr = cpu_to_le64(block_nr); 137b47820edSDaeho Jeong __u32 dummy_csum = 0; 138b47820edSDaeho Jeong int offset = offsetof(struct ext4_xattr_header, h_checksum); 139cc8e94fdSDarrick J. Wong 140d6a77105STheodore Ts'o csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, 141d6a77105STheodore Ts'o sizeof(dsk_block_nr)); 142b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); 143b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); 144b47820edSDaeho Jeong offset += sizeof(dummy_csum); 145b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, 146b47820edSDaeho Jeong EXT4_BLOCK_SIZE(inode->i_sb) - offset); 14741eb70ddSTao Ma 148cc8e94fdSDarrick J. Wong return cpu_to_le32(csum); 149cc8e94fdSDarrick J. Wong } 150cc8e94fdSDarrick J. Wong 151cc8e94fdSDarrick J. Wong static int ext4_xattr_block_csum_verify(struct inode *inode, 152dac7a4b4STheodore Ts'o struct buffer_head *bh) 153cc8e94fdSDarrick J. Wong { 154dac7a4b4STheodore Ts'o struct ext4_xattr_header *hdr = BHDR(bh); 155dac7a4b4STheodore Ts'o int ret = 1; 156dac7a4b4STheodore Ts'o 157dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) { 158dac7a4b4STheodore Ts'o lock_buffer(bh); 159dac7a4b4STheodore Ts'o ret = (hdr->h_checksum == ext4_xattr_block_csum(inode, 160dac7a4b4STheodore Ts'o bh->b_blocknr, hdr)); 161dac7a4b4STheodore Ts'o unlock_buffer(bh); 162dac7a4b4STheodore Ts'o } 163dac7a4b4STheodore Ts'o return ret; 164cc8e94fdSDarrick J. Wong } 165cc8e94fdSDarrick J. Wong 166cc8e94fdSDarrick J. Wong static void ext4_xattr_block_csum_set(struct inode *inode, 167cc8e94fdSDarrick J. Wong struct buffer_head *bh) 168cc8e94fdSDarrick J. Wong { 169dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) 170dac7a4b4STheodore Ts'o BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode, 171dac7a4b4STheodore Ts'o bh->b_blocknr, BHDR(bh)); 172cc8e94fdSDarrick J. Wong } 173cc8e94fdSDarrick J. Wong 17411e27528SStephen Hemminger static inline const struct xattr_handler * 175617ba13bSMingming Cao ext4_xattr_handler(int name_index) 176ac27a0ecSDave Kleikamp { 17711e27528SStephen Hemminger const struct xattr_handler *handler = NULL; 178ac27a0ecSDave Kleikamp 179617ba13bSMingming Cao if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) 180617ba13bSMingming Cao handler = ext4_xattr_handler_map[name_index]; 181ac27a0ecSDave Kleikamp return handler; 182ac27a0ecSDave Kleikamp } 183ac27a0ecSDave Kleikamp 184ac27a0ecSDave Kleikamp static int 1852c4f9923SEric Biggers ext4_xattr_check_entries(struct ext4_xattr_entry *entry, void *end, 186a0626e75SDarrick J. Wong void *value_start) 187ac27a0ecSDave Kleikamp { 188a0626e75SDarrick J. Wong struct ext4_xattr_entry *e = entry; 189a0626e75SDarrick J. Wong 190d7614cc1SEric Biggers /* Find the end of the names list */ 191a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(e)) { 192a0626e75SDarrick J. Wong struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); 193ac27a0ecSDave Kleikamp if ((void *)next >= end) 1946a797d27SDarrick J. Wong return -EFSCORRUPTED; 1957d95178cSTheodore Ts'o if (strnlen(e->e_name, e->e_name_len) != e->e_name_len) 1967d95178cSTheodore Ts'o return -EFSCORRUPTED; 197a0626e75SDarrick J. Wong e = next; 198ac27a0ecSDave Kleikamp } 199a0626e75SDarrick J. Wong 200d7614cc1SEric Biggers /* Check the values */ 201a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(entry)) { 202d7614cc1SEric Biggers u32 size = le32_to_cpu(entry->e_value_size); 203ce3fd194SEric Biggers 20454dd0e0aSTheodore Ts'o if (size > EXT4_XATTR_SIZE_MAX) 205ce3fd194SEric Biggers return -EFSCORRUPTED; 206ce3fd194SEric Biggers 207ce3fd194SEric Biggers if (size != 0 && entry->e_value_inum == 0) { 208ce3fd194SEric Biggers u16 offs = le16_to_cpu(entry->e_value_offs); 209d7614cc1SEric Biggers void *value; 210d7614cc1SEric Biggers 211d7614cc1SEric Biggers /* 212d7614cc1SEric Biggers * The value cannot overlap the names, and the value 213d7614cc1SEric Biggers * with padding cannot extend beyond 'end'. Check both 214d7614cc1SEric Biggers * the padded and unpadded sizes, since the size may 215d7614cc1SEric Biggers * overflow to 0 when adding padding. 216d7614cc1SEric Biggers */ 217d7614cc1SEric Biggers if (offs > end - value_start) 2186a797d27SDarrick J. Wong return -EFSCORRUPTED; 219d7614cc1SEric Biggers value = value_start + offs; 220d7614cc1SEric Biggers if (value < (void *)e + sizeof(u32) || 221d7614cc1SEric Biggers size > end - value || 222d7614cc1SEric Biggers EXT4_XATTR_SIZE(size) > end - value) 223d7614cc1SEric Biggers return -EFSCORRUPTED; 224d7614cc1SEric Biggers } 225a0626e75SDarrick J. Wong entry = EXT4_XATTR_NEXT(entry); 226a0626e75SDarrick J. Wong } 227a0626e75SDarrick J. Wong 228ac27a0ecSDave Kleikamp return 0; 229ac27a0ecSDave Kleikamp } 230ac27a0ecSDave Kleikamp 231ac27a0ecSDave Kleikamp static inline int 232de05ca85STheodore Ts'o __ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh, 233de05ca85STheodore Ts'o const char *function, unsigned int line) 234ac27a0ecSDave Kleikamp { 235de05ca85STheodore Ts'o int error = -EFSCORRUPTED; 236cc8e94fdSDarrick J. Wong 237617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 238ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) 239de05ca85STheodore Ts'o goto errout; 240513f86d7STheodore Ts'o if (buffer_verified(bh)) 241513f86d7STheodore Ts'o return 0; 242513f86d7STheodore Ts'o 243de05ca85STheodore Ts'o error = -EFSBADCRC; 244dac7a4b4STheodore Ts'o if (!ext4_xattr_block_csum_verify(inode, bh)) 245de05ca85STheodore Ts'o goto errout; 2462c4f9923SEric Biggers error = ext4_xattr_check_entries(BFIRST(bh), bh->b_data + bh->b_size, 247a0626e75SDarrick J. Wong bh->b_data); 248de05ca85STheodore Ts'o errout: 249de05ca85STheodore Ts'o if (error) 25054d3adbcSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, -error, 251de05ca85STheodore Ts'o "corrupted xattr block %llu", 252de05ca85STheodore Ts'o (unsigned long long) bh->b_blocknr); 253de05ca85STheodore Ts'o else 254cc8e94fdSDarrick J. Wong set_buffer_verified(bh); 255cc8e94fdSDarrick J. Wong return error; 256ac27a0ecSDave Kleikamp } 257ac27a0ecSDave Kleikamp 258de05ca85STheodore Ts'o #define ext4_xattr_check_block(inode, bh) \ 259de05ca85STheodore Ts'o __ext4_xattr_check_block((inode), (bh), __func__, __LINE__) 260de05ca85STheodore Ts'o 261de05ca85STheodore Ts'o 2629e92f48cSTheodore Ts'o static int 2639e92f48cSTheodore Ts'o __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, 2649e92f48cSTheodore Ts'o void *end, const char *function, unsigned int line) 2659e92f48cSTheodore Ts'o { 2669e92f48cSTheodore Ts'o int error = -EFSCORRUPTED; 2679e92f48cSTheodore Ts'o 268290ab230SEric Biggers if (end - (void *)header < sizeof(*header) + sizeof(u32) || 26919962509SEric Biggers (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) 2709e92f48cSTheodore Ts'o goto errout; 2712c4f9923SEric Biggers error = ext4_xattr_check_entries(IFIRST(header), end, IFIRST(header)); 2729e92f48cSTheodore Ts'o errout: 2739e92f48cSTheodore Ts'o if (error) 27454d3adbcSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, -error, 2759e92f48cSTheodore Ts'o "corrupted in-inode xattr"); 2769e92f48cSTheodore Ts'o return error; 2779e92f48cSTheodore Ts'o } 2789e92f48cSTheodore Ts'o 2799e92f48cSTheodore Ts'o #define xattr_check_inode(inode, header, end) \ 2809e92f48cSTheodore Ts'o __xattr_check_inode((inode), (header), (end), __func__, __LINE__) 2819e92f48cSTheodore Ts'o 282ac27a0ecSDave Kleikamp static int 2839496005dSTheodore Ts'o xattr_find_entry(struct inode *inode, struct ext4_xattr_entry **pentry, 2849496005dSTheodore Ts'o void *end, int name_index, const char *name, int sorted) 285ac27a0ecSDave Kleikamp { 2869496005dSTheodore Ts'o struct ext4_xattr_entry *entry, *next; 287ac27a0ecSDave Kleikamp size_t name_len; 288ac27a0ecSDave Kleikamp int cmp = 1; 289ac27a0ecSDave Kleikamp 290ac27a0ecSDave Kleikamp if (name == NULL) 291ac27a0ecSDave Kleikamp return -EINVAL; 292ac27a0ecSDave Kleikamp name_len = strlen(name); 2939496005dSTheodore Ts'o for (entry = *pentry; !IS_LAST_ENTRY(entry); entry = next) { 2949496005dSTheodore Ts'o next = EXT4_XATTR_NEXT(entry); 2959496005dSTheodore Ts'o if ((void *) next >= end) { 2969496005dSTheodore Ts'o EXT4_ERROR_INODE(inode, "corrupted xattr entries"); 2979496005dSTheodore Ts'o return -EFSCORRUPTED; 2989496005dSTheodore Ts'o } 299ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 300ac27a0ecSDave Kleikamp if (!cmp) 301ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 302ac27a0ecSDave Kleikamp if (!cmp) 303ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 304ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 305ac27a0ecSDave Kleikamp break; 306ac27a0ecSDave Kleikamp } 307ac27a0ecSDave Kleikamp *pentry = entry; 308ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 309ac27a0ecSDave Kleikamp } 310ac27a0ecSDave Kleikamp 311dec214d0STahsin Erdogan static u32 312dec214d0STahsin Erdogan ext4_xattr_inode_hash(struct ext4_sb_info *sbi, const void *buffer, size_t size) 313dec214d0STahsin Erdogan { 314dec214d0STahsin Erdogan return ext4_chksum(sbi, sbi->s_csum_seed, buffer, size); 315dec214d0STahsin Erdogan } 316dec214d0STahsin Erdogan 317dec214d0STahsin Erdogan static u64 ext4_xattr_inode_get_ref(struct inode *ea_inode) 318dec214d0STahsin Erdogan { 319dec214d0STahsin Erdogan return ((u64)ea_inode->i_ctime.tv_sec << 32) | 320ee73f9a5SJeff Layton (u32) inode_peek_iversion_raw(ea_inode); 321dec214d0STahsin Erdogan } 322dec214d0STahsin Erdogan 323dec214d0STahsin Erdogan static void ext4_xattr_inode_set_ref(struct inode *ea_inode, u64 ref_count) 324dec214d0STahsin Erdogan { 325dec214d0STahsin Erdogan ea_inode->i_ctime.tv_sec = (u32)(ref_count >> 32); 326ee73f9a5SJeff Layton inode_set_iversion_raw(ea_inode, ref_count & 0xffffffff); 327dec214d0STahsin Erdogan } 328dec214d0STahsin Erdogan 329dec214d0STahsin Erdogan static u32 ext4_xattr_inode_get_hash(struct inode *ea_inode) 330dec214d0STahsin Erdogan { 331dec214d0STahsin Erdogan return (u32)ea_inode->i_atime.tv_sec; 332dec214d0STahsin Erdogan } 333dec214d0STahsin Erdogan 334dec214d0STahsin Erdogan static void ext4_xattr_inode_set_hash(struct inode *ea_inode, u32 hash) 335dec214d0STahsin Erdogan { 336dec214d0STahsin Erdogan ea_inode->i_atime.tv_sec = hash; 337dec214d0STahsin Erdogan } 338dec214d0STahsin Erdogan 339e50e5129SAndreas Dilger /* 340e50e5129SAndreas Dilger * Read the EA value from an inode. 341e50e5129SAndreas Dilger */ 34290966693STahsin Erdogan static int ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t size) 343e50e5129SAndreas Dilger { 3449699d4f9STahsin Erdogan int blocksize = 1 << ea_inode->i_blkbits; 3459699d4f9STahsin Erdogan int bh_count = (size + blocksize - 1) >> ea_inode->i_blkbits; 3469699d4f9STahsin Erdogan int tail_size = (size % blocksize) ?: blocksize; 3479699d4f9STahsin Erdogan struct buffer_head *bhs_inline[8]; 3489699d4f9STahsin Erdogan struct buffer_head **bhs = bhs_inline; 3499699d4f9STahsin Erdogan int i, ret; 350e50e5129SAndreas Dilger 3519699d4f9STahsin Erdogan if (bh_count > ARRAY_SIZE(bhs_inline)) { 3529699d4f9STahsin Erdogan bhs = kmalloc_array(bh_count, sizeof(*bhs), GFP_NOFS); 3539699d4f9STahsin Erdogan if (!bhs) 3549699d4f9STahsin Erdogan return -ENOMEM; 355e50e5129SAndreas Dilger } 3569699d4f9STahsin Erdogan 3579699d4f9STahsin Erdogan ret = ext4_bread_batch(ea_inode, 0 /* block */, bh_count, 3589699d4f9STahsin Erdogan true /* wait */, bhs); 3599699d4f9STahsin Erdogan if (ret) 3609699d4f9STahsin Erdogan goto free_bhs; 3619699d4f9STahsin Erdogan 3629699d4f9STahsin Erdogan for (i = 0; i < bh_count; i++) { 3639699d4f9STahsin Erdogan /* There shouldn't be any holes in ea_inode. */ 3649699d4f9STahsin Erdogan if (!bhs[i]) { 3659699d4f9STahsin Erdogan ret = -EFSCORRUPTED; 3669699d4f9STahsin Erdogan goto put_bhs; 3679699d4f9STahsin Erdogan } 3689699d4f9STahsin Erdogan memcpy((char *)buf + blocksize * i, bhs[i]->b_data, 3699699d4f9STahsin Erdogan i < bh_count - 1 ? blocksize : tail_size); 3709699d4f9STahsin Erdogan } 3719699d4f9STahsin Erdogan ret = 0; 3729699d4f9STahsin Erdogan put_bhs: 3739699d4f9STahsin Erdogan for (i = 0; i < bh_count; i++) 3749699d4f9STahsin Erdogan brelse(bhs[i]); 3759699d4f9STahsin Erdogan free_bhs: 3769699d4f9STahsin Erdogan if (bhs != bhs_inline) 3779699d4f9STahsin Erdogan kfree(bhs); 3789699d4f9STahsin Erdogan return ret; 379e50e5129SAndreas Dilger } 380e50e5129SAndreas Dilger 381a6d05676STahsin Erdogan #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec) 382a6d05676STahsin Erdogan 383bab79b04STahsin Erdogan static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, 384a6d05676STahsin Erdogan u32 ea_inode_hash, struct inode **ea_inode) 385e50e5129SAndreas Dilger { 386bab79b04STahsin Erdogan struct inode *inode; 387bab79b04STahsin Erdogan int err; 388e50e5129SAndreas Dilger 3898a363970STheodore Ts'o inode = ext4_iget(parent->i_sb, ea_ino, EXT4_IGET_NORMAL); 390bab79b04STahsin Erdogan if (IS_ERR(inode)) { 391bab79b04STahsin Erdogan err = PTR_ERR(inode); 392dec214d0STahsin Erdogan ext4_error(parent->i_sb, 393dec214d0STahsin Erdogan "error while reading EA inode %lu err=%d", ea_ino, 394dec214d0STahsin Erdogan err); 395bab79b04STahsin Erdogan return err; 396e50e5129SAndreas Dilger } 397e50e5129SAndreas Dilger 398bab79b04STahsin Erdogan if (is_bad_inode(inode)) { 399dec214d0STahsin Erdogan ext4_error(parent->i_sb, 400dec214d0STahsin Erdogan "error while reading EA inode %lu is_bad_inode", 401dec214d0STahsin Erdogan ea_ino); 402bab79b04STahsin Erdogan err = -EIO; 403e50e5129SAndreas Dilger goto error; 404e50e5129SAndreas Dilger } 405e50e5129SAndreas Dilger 406bab79b04STahsin Erdogan if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) { 407dec214d0STahsin Erdogan ext4_error(parent->i_sb, 408dec214d0STahsin Erdogan "EA inode %lu does not have EXT4_EA_INODE_FL flag", 409dec214d0STahsin Erdogan ea_ino); 410bab79b04STahsin Erdogan err = -EINVAL; 411e50e5129SAndreas Dilger goto error; 412e50e5129SAndreas Dilger } 413e50e5129SAndreas Dilger 414a6d05676STahsin Erdogan ext4_xattr_inode_set_class(inode); 415a6d05676STahsin Erdogan 416a6d05676STahsin Erdogan /* 417a6d05676STahsin Erdogan * Check whether this is an old Lustre-style xattr inode. Lustre 418a6d05676STahsin Erdogan * implementation does not have hash validation, rather it has a 419a6d05676STahsin Erdogan * backpointer from ea_inode to the parent inode. 420a6d05676STahsin Erdogan */ 421a6d05676STahsin Erdogan if (ea_inode_hash != ext4_xattr_inode_get_hash(inode) && 422a6d05676STahsin Erdogan EXT4_XATTR_INODE_GET_PARENT(inode) == parent->i_ino && 423a6d05676STahsin Erdogan inode->i_generation == parent->i_generation) { 424a6d05676STahsin Erdogan ext4_set_inode_state(inode, EXT4_STATE_LUSTRE_EA_INODE); 425a6d05676STahsin Erdogan ext4_xattr_inode_set_ref(inode, 1); 426a6d05676STahsin Erdogan } else { 427a6d05676STahsin Erdogan inode_lock(inode); 428a6d05676STahsin Erdogan inode->i_flags |= S_NOQUOTA; 429a6d05676STahsin Erdogan inode_unlock(inode); 430a6d05676STahsin Erdogan } 431a6d05676STahsin Erdogan 432bab79b04STahsin Erdogan *ea_inode = inode; 433bab79b04STahsin Erdogan return 0; 434e50e5129SAndreas Dilger error: 435bab79b04STahsin Erdogan iput(inode); 436bab79b04STahsin Erdogan return err; 437e50e5129SAndreas Dilger } 438e50e5129SAndreas Dilger 4396bc0d63dSJan Kara /* Remove entry from mbcache when EA inode is getting evicted */ 4406bc0d63dSJan Kara void ext4_evict_ea_inode(struct inode *inode) 4416bc0d63dSJan Kara { 4426bc0d63dSJan Kara if (EA_INODE_CACHE(inode)) 4436bc0d63dSJan Kara mb_cache_entry_delete(EA_INODE_CACHE(inode), 4446bc0d63dSJan Kara ext4_xattr_inode_get_hash(inode), inode->i_ino); 4456bc0d63dSJan Kara } 4466bc0d63dSJan Kara 447dec214d0STahsin Erdogan static int 448b9fc761eSTahsin Erdogan ext4_xattr_inode_verify_hashes(struct inode *ea_inode, 449b9fc761eSTahsin Erdogan struct ext4_xattr_entry *entry, void *buffer, 450b9fc761eSTahsin Erdogan size_t size) 451dec214d0STahsin Erdogan { 452dec214d0STahsin Erdogan u32 hash; 453dec214d0STahsin Erdogan 454dec214d0STahsin Erdogan /* Verify stored hash matches calculated hash. */ 455dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); 456dec214d0STahsin Erdogan if (hash != ext4_xattr_inode_get_hash(ea_inode)) 457dec214d0STahsin Erdogan return -EFSCORRUPTED; 458b9fc761eSTahsin Erdogan 459b9fc761eSTahsin Erdogan if (entry) { 460b9fc761eSTahsin Erdogan __le32 e_hash, tmp_data; 461b9fc761eSTahsin Erdogan 462b9fc761eSTahsin Erdogan /* Verify entry hash. */ 463b9fc761eSTahsin Erdogan tmp_data = cpu_to_le32(hash); 464b9fc761eSTahsin Erdogan e_hash = ext4_xattr_hash_entry(entry->e_name, entry->e_name_len, 465b9fc761eSTahsin Erdogan &tmp_data, 1); 466b9fc761eSTahsin Erdogan if (e_hash != entry->e_hash) 467b9fc761eSTahsin Erdogan return -EFSCORRUPTED; 468b9fc761eSTahsin Erdogan } 469dec214d0STahsin Erdogan return 0; 470dec214d0STahsin Erdogan } 471dec214d0STahsin Erdogan 472e50e5129SAndreas Dilger /* 473b9fc761eSTahsin Erdogan * Read xattr value from the EA inode. 474e50e5129SAndreas Dilger */ 475e50e5129SAndreas Dilger static int 476b9fc761eSTahsin Erdogan ext4_xattr_inode_get(struct inode *inode, struct ext4_xattr_entry *entry, 477b9fc761eSTahsin Erdogan void *buffer, size_t size) 478e50e5129SAndreas Dilger { 479dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 480bab79b04STahsin Erdogan struct inode *ea_inode; 481dec214d0STahsin Erdogan int err; 482e50e5129SAndreas Dilger 483b9fc761eSTahsin Erdogan err = ext4_xattr_inode_iget(inode, le32_to_cpu(entry->e_value_inum), 484a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), &ea_inode); 485dec214d0STahsin Erdogan if (err) { 486dec214d0STahsin Erdogan ea_inode = NULL; 487dec214d0STahsin Erdogan goto out; 488dec214d0STahsin Erdogan } 489e50e5129SAndreas Dilger 490dec214d0STahsin Erdogan if (i_size_read(ea_inode) != size) { 491dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 492dec214d0STahsin Erdogan "ea_inode file size=%llu entry size=%zu", 493dec214d0STahsin Erdogan i_size_read(ea_inode), size); 494dec214d0STahsin Erdogan err = -EFSCORRUPTED; 495dec214d0STahsin Erdogan goto out; 496dec214d0STahsin Erdogan } 497dec214d0STahsin Erdogan 498dec214d0STahsin Erdogan err = ext4_xattr_inode_read(ea_inode, buffer, size); 499dec214d0STahsin Erdogan if (err) 500dec214d0STahsin Erdogan goto out; 501dec214d0STahsin Erdogan 502a6d05676STahsin Erdogan if (!ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) { 503a6d05676STahsin Erdogan err = ext4_xattr_inode_verify_hashes(ea_inode, entry, buffer, 504a6d05676STahsin Erdogan size); 505a6d05676STahsin Erdogan if (err) { 506dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 507dec214d0STahsin Erdogan "EA inode hash validation failed"); 508dec214d0STahsin Erdogan goto out; 509dec214d0STahsin Erdogan } 510dec214d0STahsin Erdogan 511dec214d0STahsin Erdogan if (ea_inode_cache) 512dec214d0STahsin Erdogan mb_cache_entry_create(ea_inode_cache, GFP_NOFS, 513dec214d0STahsin Erdogan ext4_xattr_inode_get_hash(ea_inode), 514dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 515a6d05676STahsin Erdogan } 516dec214d0STahsin Erdogan out: 517e50e5129SAndreas Dilger iput(ea_inode); 518dec214d0STahsin Erdogan return err; 519e50e5129SAndreas Dilger } 520e50e5129SAndreas Dilger 521ac27a0ecSDave Kleikamp static int 522617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 523ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 524ac27a0ecSDave Kleikamp { 525ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 526617ba13bSMingming Cao struct ext4_xattr_entry *entry; 527ac27a0ecSDave Kleikamp size_t size; 5289496005dSTheodore Ts'o void *end; 529ac27a0ecSDave Kleikamp int error; 53047387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 531ac27a0ecSDave Kleikamp 532ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 533ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 534ac27a0ecSDave Kleikamp 535617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 536fb265c9cSTheodore Ts'o return -ENODATA; 537ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 538ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 539fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 540fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 541fb265c9cSTheodore Ts'o return PTR_ERR(bh); 542ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 543ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 544de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 545de05ca85STheodore Ts'o if (error) 546ac27a0ecSDave Kleikamp goto cleanup; 54747387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bh); 548ac27a0ecSDave Kleikamp entry = BFIRST(bh); 5499496005dSTheodore Ts'o end = bh->b_data + bh->b_size; 5509496005dSTheodore Ts'o error = xattr_find_entry(inode, &entry, end, name_index, name, 1); 551ac27a0ecSDave Kleikamp if (error) 552ac27a0ecSDave Kleikamp goto cleanup; 553ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 554ac27a0ecSDave Kleikamp error = -ERANGE; 55554dd0e0aSTheodore Ts'o if (unlikely(size > EXT4_XATTR_SIZE_MAX)) 55654dd0e0aSTheodore Ts'o goto cleanup; 55754dd0e0aSTheodore Ts'o if (buffer) { 558ac27a0ecSDave Kleikamp if (size > buffer_size) 559ac27a0ecSDave Kleikamp goto cleanup; 560e50e5129SAndreas Dilger if (entry->e_value_inum) { 561b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 562b9fc761eSTahsin Erdogan size); 563e50e5129SAndreas Dilger if (error) 564e50e5129SAndreas Dilger goto cleanup; 565e50e5129SAndreas Dilger } else { 56654dd0e0aSTheodore Ts'o u16 offset = le16_to_cpu(entry->e_value_offs); 56754dd0e0aSTheodore Ts'o void *p = bh->b_data + offset; 56854dd0e0aSTheodore Ts'o 56954dd0e0aSTheodore Ts'o if (unlikely(p + size > end)) 57054dd0e0aSTheodore Ts'o goto cleanup; 57154dd0e0aSTheodore Ts'o memcpy(buffer, p, size); 572e50e5129SAndreas Dilger } 573ac27a0ecSDave Kleikamp } 574ac27a0ecSDave Kleikamp error = size; 575ac27a0ecSDave Kleikamp 576ac27a0ecSDave Kleikamp cleanup: 577ac27a0ecSDave Kleikamp brelse(bh); 578ac27a0ecSDave Kleikamp return error; 579ac27a0ecSDave Kleikamp } 580ac27a0ecSDave Kleikamp 581879b3825STao Ma int 582617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 583ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 584ac27a0ecSDave Kleikamp { 585617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 586617ba13bSMingming Cao struct ext4_xattr_entry *entry; 587617ba13bSMingming Cao struct ext4_inode *raw_inode; 588617ba13bSMingming Cao struct ext4_iloc iloc; 589ac27a0ecSDave Kleikamp size_t size; 590ac27a0ecSDave Kleikamp void *end; 591ac27a0ecSDave Kleikamp int error; 592ac27a0ecSDave Kleikamp 59319f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 594ac27a0ecSDave Kleikamp return -ENODATA; 595617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 596ac27a0ecSDave Kleikamp if (error) 597ac27a0ecSDave Kleikamp return error; 598617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 599ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 600617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 6019e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 602ac27a0ecSDave Kleikamp if (error) 603ac27a0ecSDave Kleikamp goto cleanup; 6046ba644b9SEric Biggers entry = IFIRST(header); 6059496005dSTheodore Ts'o error = xattr_find_entry(inode, &entry, end, name_index, name, 0); 606ac27a0ecSDave Kleikamp if (error) 607ac27a0ecSDave Kleikamp goto cleanup; 608ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 609ac27a0ecSDave Kleikamp error = -ERANGE; 61054dd0e0aSTheodore Ts'o if (unlikely(size > EXT4_XATTR_SIZE_MAX)) 61154dd0e0aSTheodore Ts'o goto cleanup; 61254dd0e0aSTheodore Ts'o if (buffer) { 613ac27a0ecSDave Kleikamp if (size > buffer_size) 614ac27a0ecSDave Kleikamp goto cleanup; 615e50e5129SAndreas Dilger if (entry->e_value_inum) { 616b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 617b9fc761eSTahsin Erdogan size); 618e50e5129SAndreas Dilger if (error) 619e50e5129SAndreas Dilger goto cleanup; 620e50e5129SAndreas Dilger } else { 62154dd0e0aSTheodore Ts'o u16 offset = le16_to_cpu(entry->e_value_offs); 62254dd0e0aSTheodore Ts'o void *p = (void *)IFIRST(header) + offset; 62354dd0e0aSTheodore Ts'o 62454dd0e0aSTheodore Ts'o if (unlikely(p + size > end)) 62554dd0e0aSTheodore Ts'o goto cleanup; 62654dd0e0aSTheodore Ts'o memcpy(buffer, p, size); 627ac27a0ecSDave Kleikamp } 628e50e5129SAndreas Dilger } 629ac27a0ecSDave Kleikamp error = size; 630ac27a0ecSDave Kleikamp 631ac27a0ecSDave Kleikamp cleanup: 632ac27a0ecSDave Kleikamp brelse(iloc.bh); 633ac27a0ecSDave Kleikamp return error; 634ac27a0ecSDave Kleikamp } 635ac27a0ecSDave Kleikamp 636ac27a0ecSDave Kleikamp /* 637617ba13bSMingming Cao * ext4_xattr_get() 638ac27a0ecSDave Kleikamp * 639ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 640ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 641ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 642ac27a0ecSDave Kleikamp * 643ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 644ac27a0ecSDave Kleikamp * used / required on success. 645ac27a0ecSDave Kleikamp */ 646ac27a0ecSDave Kleikamp int 647617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 648ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 649ac27a0ecSDave Kleikamp { 650ac27a0ecSDave Kleikamp int error; 651ac27a0ecSDave Kleikamp 6520db1ff22STheodore Ts'o if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 6530db1ff22STheodore Ts'o return -EIO; 6540db1ff22STheodore Ts'o 655230b8c1aSZhang Zhen if (strlen(name) > 255) 656230b8c1aSZhang Zhen return -ERANGE; 657230b8c1aSZhang Zhen 658617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 659617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 660ac27a0ecSDave Kleikamp buffer_size); 661ac27a0ecSDave Kleikamp if (error == -ENODATA) 662617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 663ac27a0ecSDave Kleikamp buffer_size); 664617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 665ac27a0ecSDave Kleikamp return error; 666ac27a0ecSDave Kleikamp } 667ac27a0ecSDave Kleikamp 668ac27a0ecSDave Kleikamp static int 669431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 670ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 671ac27a0ecSDave Kleikamp { 672ac27a0ecSDave Kleikamp size_t rest = buffer_size; 673ac27a0ecSDave Kleikamp 674617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 67511e27528SStephen Hemminger const struct xattr_handler *handler = 676617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 677ac27a0ecSDave Kleikamp 678764a5c6bSAndreas Gruenbacher if (handler && (!handler->list || handler->list(dentry))) { 679764a5c6bSAndreas Gruenbacher const char *prefix = handler->prefix ?: handler->name; 680764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 681764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 682764a5c6bSAndreas Gruenbacher 683ac27a0ecSDave Kleikamp if (buffer) { 684ac27a0ecSDave Kleikamp if (size > rest) 685ac27a0ecSDave Kleikamp return -ERANGE; 686764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 687764a5c6bSAndreas Gruenbacher buffer += prefix_len; 688764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 689764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 690764a5c6bSAndreas Gruenbacher *buffer++ = 0; 691ac27a0ecSDave Kleikamp } 692ac27a0ecSDave Kleikamp rest -= size; 693ac27a0ecSDave Kleikamp } 694ac27a0ecSDave Kleikamp } 695764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 696ac27a0ecSDave Kleikamp } 697ac27a0ecSDave Kleikamp 698ac27a0ecSDave Kleikamp static int 699431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 700ac27a0ecSDave Kleikamp { 7012b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 702ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 703ac27a0ecSDave Kleikamp int error; 704ac27a0ecSDave Kleikamp 705ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 706ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 707ac27a0ecSDave Kleikamp 708617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 709fb265c9cSTheodore Ts'o return 0; 710ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 711ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 712fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 713fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 714fb265c9cSTheodore Ts'o return PTR_ERR(bh); 715ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 716ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 717de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 718de05ca85STheodore Ts'o if (error) 719ac27a0ecSDave Kleikamp goto cleanup; 72047387409STahsin Erdogan ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); 721fb265c9cSTheodore Ts'o error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, 722fb265c9cSTheodore Ts'o buffer_size); 723ac27a0ecSDave Kleikamp cleanup: 724ac27a0ecSDave Kleikamp brelse(bh); 725ac27a0ecSDave Kleikamp return error; 726ac27a0ecSDave Kleikamp } 727ac27a0ecSDave Kleikamp 728ac27a0ecSDave Kleikamp static int 729431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 730ac27a0ecSDave Kleikamp { 7312b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 732617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 733617ba13bSMingming Cao struct ext4_inode *raw_inode; 734617ba13bSMingming Cao struct ext4_iloc iloc; 735ac27a0ecSDave Kleikamp void *end; 736ac27a0ecSDave Kleikamp int error; 737ac27a0ecSDave Kleikamp 73819f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 739ac27a0ecSDave Kleikamp return 0; 740617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 741ac27a0ecSDave Kleikamp if (error) 742ac27a0ecSDave Kleikamp return error; 743617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 744ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 745617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 7469e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 747ac27a0ecSDave Kleikamp if (error) 748ac27a0ecSDave Kleikamp goto cleanup; 749431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 750ac27a0ecSDave Kleikamp buffer, buffer_size); 751ac27a0ecSDave Kleikamp 752ac27a0ecSDave Kleikamp cleanup: 753ac27a0ecSDave Kleikamp brelse(iloc.bh); 754ac27a0ecSDave Kleikamp return error; 755ac27a0ecSDave Kleikamp } 756ac27a0ecSDave Kleikamp 757ac27a0ecSDave Kleikamp /* 758ba7ea1d8SEric Biggers * Inode operation listxattr() 759ba7ea1d8SEric Biggers * 760ba7ea1d8SEric Biggers * d_inode(dentry)->i_rwsem: don't care 761ac27a0ecSDave Kleikamp * 762ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 763ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 764ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 765ac27a0ecSDave Kleikamp * 766ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 767ac27a0ecSDave Kleikamp * used / required on success. 768ac27a0ecSDave Kleikamp */ 769ba7ea1d8SEric Biggers ssize_t 770ba7ea1d8SEric Biggers ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) 771ac27a0ecSDave Kleikamp { 772eaeef867STheodore Ts'o int ret, ret2; 773ac27a0ecSDave Kleikamp 7742b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 775eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 776eaeef867STheodore Ts'o if (ret < 0) 777eaeef867STheodore Ts'o goto errout; 778ac27a0ecSDave Kleikamp if (buffer) { 779eaeef867STheodore Ts'o buffer += ret; 780eaeef867STheodore Ts'o buffer_size -= ret; 781ac27a0ecSDave Kleikamp } 782eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 783eaeef867STheodore Ts'o if (ret < 0) 784eaeef867STheodore Ts'o goto errout; 785eaeef867STheodore Ts'o ret += ret2; 786eaeef867STheodore Ts'o errout: 7872b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 788eaeef867STheodore Ts'o return ret; 789ac27a0ecSDave Kleikamp } 790ac27a0ecSDave Kleikamp 791ac27a0ecSDave Kleikamp /* 792617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 793ac27a0ecSDave Kleikamp * not set, set it. 794ac27a0ecSDave Kleikamp */ 795617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 796ac27a0ecSDave Kleikamp struct super_block *sb) 797ac27a0ecSDave Kleikamp { 798e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 799ac27a0ecSDave Kleikamp return; 800ac27a0ecSDave Kleikamp 8015d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 802188c299eSJan Kara if (ext4_journal_get_write_access(handle, sb, EXT4_SB(sb)->s_sbh, 803188c299eSJan Kara EXT4_JTR_NONE) == 0) { 80405c2c00fSJan Kara lock_buffer(EXT4_SB(sb)->s_sbh); 805e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 80605c2c00fSJan Kara ext4_superblock_csum_set(sb); 80705c2c00fSJan Kara unlock_buffer(EXT4_SB(sb)->s_sbh); 808a3f5cf14SJan Kara ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); 809ac27a0ecSDave Kleikamp } 810ac27a0ecSDave Kleikamp } 811ac27a0ecSDave Kleikamp 8127a9ca53aSTahsin Erdogan int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) 8137a9ca53aSTahsin Erdogan { 8147a9ca53aSTahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 8157a9ca53aSTahsin Erdogan struct buffer_head *bh = NULL; 8167a9ca53aSTahsin Erdogan struct ext4_inode *raw_inode; 8177a9ca53aSTahsin Erdogan struct ext4_xattr_ibody_header *header; 8187a9ca53aSTahsin Erdogan struct ext4_xattr_entry *entry; 8197a9ca53aSTahsin Erdogan qsize_t ea_inode_refs = 0; 8207a9ca53aSTahsin Erdogan void *end; 8217a9ca53aSTahsin Erdogan int ret; 8227a9ca53aSTahsin Erdogan 8237a9ca53aSTahsin Erdogan lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); 8247a9ca53aSTahsin Erdogan 8257a9ca53aSTahsin Erdogan if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 8267a9ca53aSTahsin Erdogan ret = ext4_get_inode_loc(inode, &iloc); 8277a9ca53aSTahsin Erdogan if (ret) 8287a9ca53aSTahsin Erdogan goto out; 8297a9ca53aSTahsin Erdogan raw_inode = ext4_raw_inode(&iloc); 8307a9ca53aSTahsin Erdogan header = IHDR(inode, raw_inode); 8317a9ca53aSTahsin Erdogan end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 8327a9ca53aSTahsin Erdogan ret = xattr_check_inode(inode, header, end); 8337a9ca53aSTahsin Erdogan if (ret) 8347a9ca53aSTahsin Erdogan goto out; 8357a9ca53aSTahsin Erdogan 8367a9ca53aSTahsin Erdogan for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); 8377a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 8387a9ca53aSTahsin Erdogan if (entry->e_value_inum) 8397a9ca53aSTahsin Erdogan ea_inode_refs++; 8407a9ca53aSTahsin Erdogan } 8417a9ca53aSTahsin Erdogan 8427a9ca53aSTahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 843fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 844fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 845fb265c9cSTheodore Ts'o ret = PTR_ERR(bh); 8467159a986SDan Carpenter bh = NULL; 8477a9ca53aSTahsin Erdogan goto out; 8487a9ca53aSTahsin Erdogan } 8497a9ca53aSTahsin Erdogan 850de05ca85STheodore Ts'o ret = ext4_xattr_check_block(inode, bh); 851de05ca85STheodore Ts'o if (ret) 8527a9ca53aSTahsin Erdogan goto out; 8537a9ca53aSTahsin Erdogan 8547a9ca53aSTahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 8557a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 8567a9ca53aSTahsin Erdogan if (entry->e_value_inum) 8577a9ca53aSTahsin Erdogan ea_inode_refs++; 8587a9ca53aSTahsin Erdogan } 8597a9ca53aSTahsin Erdogan *usage = ea_inode_refs + 1; 8607a9ca53aSTahsin Erdogan ret = 0; 8617a9ca53aSTahsin Erdogan out: 8627a9ca53aSTahsin Erdogan brelse(iloc.bh); 8637a9ca53aSTahsin Erdogan brelse(bh); 8647a9ca53aSTahsin Erdogan return ret; 8657a9ca53aSTahsin Erdogan } 8667a9ca53aSTahsin Erdogan 867dec214d0STahsin Erdogan static inline size_t round_up_cluster(struct inode *inode, size_t length) 868dec214d0STahsin Erdogan { 869dec214d0STahsin Erdogan struct super_block *sb = inode->i_sb; 870dec214d0STahsin Erdogan size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + 871dec214d0STahsin Erdogan inode->i_blkbits); 872dec214d0STahsin Erdogan size_t mask = ~(cluster_size - 1); 873dec214d0STahsin Erdogan 874dec214d0STahsin Erdogan return (length + cluster_size - 1) & mask; 875dec214d0STahsin Erdogan } 876dec214d0STahsin Erdogan 877dec214d0STahsin Erdogan static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) 878dec214d0STahsin Erdogan { 879dec214d0STahsin Erdogan int err; 880dec214d0STahsin Erdogan 881dec214d0STahsin Erdogan err = dquot_alloc_inode(inode); 882dec214d0STahsin Erdogan if (err) 883dec214d0STahsin Erdogan return err; 884dec214d0STahsin Erdogan err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); 885dec214d0STahsin Erdogan if (err) 886dec214d0STahsin Erdogan dquot_free_inode(inode); 887dec214d0STahsin Erdogan return err; 888dec214d0STahsin Erdogan } 889dec214d0STahsin Erdogan 890a6d05676STahsin Erdogan static void ext4_xattr_inode_free_quota(struct inode *parent, 891a6d05676STahsin Erdogan struct inode *ea_inode, 892a6d05676STahsin Erdogan size_t len) 893dec214d0STahsin Erdogan { 894a6d05676STahsin Erdogan if (ea_inode && 895a6d05676STahsin Erdogan ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) 896a6d05676STahsin Erdogan return; 897a6d05676STahsin Erdogan dquot_free_space_nodirty(parent, round_up_cluster(parent, len)); 898a6d05676STahsin Erdogan dquot_free_inode(parent); 899dec214d0STahsin Erdogan } 900dec214d0STahsin Erdogan 901af65207cSTahsin Erdogan int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode, 902af65207cSTahsin Erdogan struct buffer_head *block_bh, size_t value_len, 903af65207cSTahsin Erdogan bool is_create) 904dec214d0STahsin Erdogan { 905dec214d0STahsin Erdogan int credits; 906dec214d0STahsin Erdogan int blocks; 907dec214d0STahsin Erdogan 908dec214d0STahsin Erdogan /* 909dec214d0STahsin Erdogan * 1) Owner inode update 910dec214d0STahsin Erdogan * 2) Ref count update on old xattr block 911dec214d0STahsin Erdogan * 3) new xattr block 912dec214d0STahsin Erdogan * 4) block bitmap update for new xattr block 913dec214d0STahsin Erdogan * 5) group descriptor for new xattr block 914dec214d0STahsin Erdogan * 6) block bitmap update for old xattr block 915dec214d0STahsin Erdogan * 7) group descriptor for old block 916dec214d0STahsin Erdogan * 917dec214d0STahsin Erdogan * 6 & 7 can happen if we have two racing threads T_a and T_b 918dec214d0STahsin Erdogan * which are each trying to set an xattr on inodes I_a and I_b 919dec214d0STahsin Erdogan * which were both initially sharing an xattr block. 920dec214d0STahsin Erdogan */ 921dec214d0STahsin Erdogan credits = 7; 922dec214d0STahsin Erdogan 923dec214d0STahsin Erdogan /* Quota updates. */ 924dec214d0STahsin Erdogan credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); 925dec214d0STahsin Erdogan 926dec214d0STahsin Erdogan /* 927dec214d0STahsin Erdogan * In case of inline data, we may push out the data to a block, 928dec214d0STahsin Erdogan * so we need to reserve credits for this eventuality 929dec214d0STahsin Erdogan */ 930af65207cSTahsin Erdogan if (inode && ext4_has_inline_data(inode)) 931dec214d0STahsin Erdogan credits += ext4_writepage_trans_blocks(inode) + 1; 932dec214d0STahsin Erdogan 933dec214d0STahsin Erdogan /* We are done if ea_inode feature is not enabled. */ 934dec214d0STahsin Erdogan if (!ext4_has_feature_ea_inode(sb)) 935dec214d0STahsin Erdogan return credits; 936dec214d0STahsin Erdogan 937dec214d0STahsin Erdogan /* New ea_inode, inode map, block bitmap, group descriptor. */ 938dec214d0STahsin Erdogan credits += 4; 939dec214d0STahsin Erdogan 940dec214d0STahsin Erdogan /* Data blocks. */ 941dec214d0STahsin Erdogan blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 942dec214d0STahsin Erdogan 943dec214d0STahsin Erdogan /* Indirection block or one level of extent tree. */ 944dec214d0STahsin Erdogan blocks += 1; 945dec214d0STahsin Erdogan 946dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 947dec214d0STahsin Erdogan credits += blocks * 2; 948dec214d0STahsin Erdogan 949dec214d0STahsin Erdogan /* Blocks themselves. */ 950dec214d0STahsin Erdogan credits += blocks; 951dec214d0STahsin Erdogan 952af65207cSTahsin Erdogan if (!is_create) { 953dec214d0STahsin Erdogan /* Dereference ea_inode holding old xattr value. 954dec214d0STahsin Erdogan * Old ea_inode, inode map, block bitmap, group descriptor. 955dec214d0STahsin Erdogan */ 956dec214d0STahsin Erdogan credits += 4; 957dec214d0STahsin Erdogan 958dec214d0STahsin Erdogan /* Data blocks for old ea_inode. */ 959dec214d0STahsin Erdogan blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; 960dec214d0STahsin Erdogan 961af65207cSTahsin Erdogan /* Indirection block or one level of extent tree for old 962af65207cSTahsin Erdogan * ea_inode. 963af65207cSTahsin Erdogan */ 964dec214d0STahsin Erdogan blocks += 1; 965dec214d0STahsin Erdogan 966dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 967dec214d0STahsin Erdogan credits += blocks * 2; 968af65207cSTahsin Erdogan } 969dec214d0STahsin Erdogan 970dec214d0STahsin Erdogan /* We may need to clone the existing xattr block in which case we need 971dec214d0STahsin Erdogan * to increment ref counts for existing ea_inodes referenced by it. 972dec214d0STahsin Erdogan */ 973dec214d0STahsin Erdogan if (block_bh) { 974dec214d0STahsin Erdogan struct ext4_xattr_entry *entry = BFIRST(block_bh); 975dec214d0STahsin Erdogan 976dec214d0STahsin Erdogan for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) 977dec214d0STahsin Erdogan if (entry->e_value_inum) 978dec214d0STahsin Erdogan /* Ref count update on ea_inode. */ 979dec214d0STahsin Erdogan credits += 1; 980dec214d0STahsin Erdogan } 981dec214d0STahsin Erdogan return credits; 982dec214d0STahsin Erdogan } 983dec214d0STahsin Erdogan 984dec214d0STahsin Erdogan static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, 985dec214d0STahsin Erdogan int ref_change) 986dec214d0STahsin Erdogan { 987dec214d0STahsin Erdogan struct ext4_iloc iloc; 988dec214d0STahsin Erdogan s64 ref_count; 989dec214d0STahsin Erdogan int ret; 990dec214d0STahsin Erdogan 991dec214d0STahsin Erdogan inode_lock(ea_inode); 992dec214d0STahsin Erdogan 993dec214d0STahsin Erdogan ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); 9941bfc204dSVasily Averin if (ret) 995dec214d0STahsin Erdogan goto out; 996dec214d0STahsin Erdogan 997dec214d0STahsin Erdogan ref_count = ext4_xattr_inode_get_ref(ea_inode); 998dec214d0STahsin Erdogan ref_count += ref_change; 999dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, ref_count); 1000dec214d0STahsin Erdogan 1001dec214d0STahsin Erdogan if (ref_change > 0) { 1002dec214d0STahsin Erdogan WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", 1003dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1004dec214d0STahsin Erdogan 1005dec214d0STahsin Erdogan if (ref_count == 1) { 1006dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", 1007dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1008dec214d0STahsin Erdogan 1009dec214d0STahsin Erdogan set_nlink(ea_inode, 1); 1010dec214d0STahsin Erdogan ext4_orphan_del(handle, ea_inode); 1011cdb7ee4cSTahsin Erdogan } 1012dec214d0STahsin Erdogan } else { 1013dec214d0STahsin Erdogan WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", 1014dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1015dec214d0STahsin Erdogan 1016dec214d0STahsin Erdogan if (ref_count == 0) { 1017dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink != 1, 1018dec214d0STahsin Erdogan "EA inode %lu i_nlink=%u", 1019dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1020dec214d0STahsin Erdogan 1021dec214d0STahsin Erdogan clear_nlink(ea_inode); 1022dec214d0STahsin Erdogan ext4_orphan_add(handle, ea_inode); 1023dec214d0STahsin Erdogan } 1024cdb7ee4cSTahsin Erdogan } 1025dec214d0STahsin Erdogan 1026dec214d0STahsin Erdogan ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); 1027dec214d0STahsin Erdogan if (ret) 1028dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 1029dec214d0STahsin Erdogan "ext4_mark_iloc_dirty() failed ret=%d", ret); 1030dec214d0STahsin Erdogan out: 1031dec214d0STahsin Erdogan inode_unlock(ea_inode); 1032dec214d0STahsin Erdogan return ret; 1033dec214d0STahsin Erdogan } 1034dec214d0STahsin Erdogan 1035dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) 1036dec214d0STahsin Erdogan { 1037dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, 1); 1038dec214d0STahsin Erdogan } 1039dec214d0STahsin Erdogan 1040dec214d0STahsin Erdogan static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) 1041dec214d0STahsin Erdogan { 1042dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, -1); 1043dec214d0STahsin Erdogan } 1044dec214d0STahsin Erdogan 1045dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, 1046dec214d0STahsin Erdogan struct ext4_xattr_entry *first) 1047dec214d0STahsin Erdogan { 1048dec214d0STahsin Erdogan struct inode *ea_inode; 1049dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 1050dec214d0STahsin Erdogan struct ext4_xattr_entry *failed_entry; 1051dec214d0STahsin Erdogan unsigned int ea_ino; 1052dec214d0STahsin Erdogan int err, saved_err; 1053dec214d0STahsin Erdogan 1054dec214d0STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 1055dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1056dec214d0STahsin Erdogan if (!entry->e_value_inum) 1057dec214d0STahsin Erdogan continue; 1058dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1059a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1060a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1061a6d05676STahsin Erdogan &ea_inode); 1062dec214d0STahsin Erdogan if (err) 1063dec214d0STahsin Erdogan goto cleanup; 1064dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1065dec214d0STahsin Erdogan if (err) { 1066dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "inc ref error %d", err); 1067dec214d0STahsin Erdogan iput(ea_inode); 1068dec214d0STahsin Erdogan goto cleanup; 1069dec214d0STahsin Erdogan } 1070dec214d0STahsin Erdogan iput(ea_inode); 1071dec214d0STahsin Erdogan } 1072dec214d0STahsin Erdogan return 0; 1073dec214d0STahsin Erdogan 1074dec214d0STahsin Erdogan cleanup: 1075dec214d0STahsin Erdogan saved_err = err; 1076dec214d0STahsin Erdogan failed_entry = entry; 1077dec214d0STahsin Erdogan 1078dec214d0STahsin Erdogan for (entry = first; entry != failed_entry; 1079dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1080dec214d0STahsin Erdogan if (!entry->e_value_inum) 1081dec214d0STahsin Erdogan continue; 1082dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1083a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1084a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1085a6d05676STahsin Erdogan &ea_inode); 1086dec214d0STahsin Erdogan if (err) { 1087dec214d0STahsin Erdogan ext4_warning(parent->i_sb, 1088dec214d0STahsin Erdogan "cleanup ea_ino %u iget error %d", ea_ino, 1089dec214d0STahsin Erdogan err); 1090dec214d0STahsin Erdogan continue; 1091dec214d0STahsin Erdogan } 1092dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1093dec214d0STahsin Erdogan if (err) 1094dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "cleanup dec ref error %d", 1095dec214d0STahsin Erdogan err); 1096dec214d0STahsin Erdogan iput(ea_inode); 1097dec214d0STahsin Erdogan } 1098dec214d0STahsin Erdogan return saved_err; 1099dec214d0STahsin Erdogan } 1100dec214d0STahsin Erdogan 1101a4130367SJan Kara static int ext4_xattr_restart_fn(handle_t *handle, struct inode *inode, 1102a4130367SJan Kara struct buffer_head *bh, bool block_csum, bool dirty) 1103a4130367SJan Kara { 1104a4130367SJan Kara int error; 1105a4130367SJan Kara 1106a4130367SJan Kara if (bh && dirty) { 1107a4130367SJan Kara if (block_csum) 1108a4130367SJan Kara ext4_xattr_block_csum_set(inode, bh); 1109a4130367SJan Kara error = ext4_handle_dirty_metadata(handle, NULL, bh); 1110a4130367SJan Kara if (error) { 1111a4130367SJan Kara ext4_warning(inode->i_sb, "Handle metadata (error %d)", 1112a4130367SJan Kara error); 1113a4130367SJan Kara return error; 1114a4130367SJan Kara } 1115a4130367SJan Kara } 1116a4130367SJan Kara return 0; 1117a4130367SJan Kara } 1118a4130367SJan Kara 111930a7eb97STahsin Erdogan static void 1120dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, 112130a7eb97STahsin Erdogan struct buffer_head *bh, 112230a7eb97STahsin Erdogan struct ext4_xattr_entry *first, bool block_csum, 112330a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1124dec214d0STahsin Erdogan int extra_credits, bool skip_quota) 112530a7eb97STahsin Erdogan { 112630a7eb97STahsin Erdogan struct inode *ea_inode; 112730a7eb97STahsin Erdogan struct ext4_xattr_entry *entry; 112830a7eb97STahsin Erdogan bool dirty = false; 112930a7eb97STahsin Erdogan unsigned int ea_ino; 113030a7eb97STahsin Erdogan int err; 113130a7eb97STahsin Erdogan int credits; 113230a7eb97STahsin Erdogan 113330a7eb97STahsin Erdogan /* One credit for dec ref on ea_inode, one for orphan list addition, */ 113430a7eb97STahsin Erdogan credits = 2 + extra_credits; 113530a7eb97STahsin Erdogan 113630a7eb97STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 113730a7eb97STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 113830a7eb97STahsin Erdogan if (!entry->e_value_inum) 113930a7eb97STahsin Erdogan continue; 114030a7eb97STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1141a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1142a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1143a6d05676STahsin Erdogan &ea_inode); 114430a7eb97STahsin Erdogan if (err) 114530a7eb97STahsin Erdogan continue; 114630a7eb97STahsin Erdogan 114730a7eb97STahsin Erdogan err = ext4_expand_inode_array(ea_inode_array, ea_inode); 114830a7eb97STahsin Erdogan if (err) { 114930a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, 115030a7eb97STahsin Erdogan "Expand inode array err=%d", err); 115130a7eb97STahsin Erdogan iput(ea_inode); 115230a7eb97STahsin Erdogan continue; 115330a7eb97STahsin Erdogan } 115430a7eb97STahsin Erdogan 1155a4130367SJan Kara err = ext4_journal_ensure_credits_fn(handle, credits, credits, 115683448bdfSJan Kara ext4_free_metadata_revoke_credits(parent->i_sb, 1), 1157a4130367SJan Kara ext4_xattr_restart_fn(handle, parent, bh, block_csum, 1158a4130367SJan Kara dirty)); 1159a4130367SJan Kara if (err < 0) { 116030a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, "Ensure credits err=%d", 116130a7eb97STahsin Erdogan err); 116230a7eb97STahsin Erdogan continue; 116330a7eb97STahsin Erdogan } 1164a4130367SJan Kara if (err > 0) { 1165188c299eSJan Kara err = ext4_journal_get_write_access(handle, 1166188c299eSJan Kara parent->i_sb, bh, EXT4_JTR_NONE); 1167a4130367SJan Kara if (err) { 1168a4130367SJan Kara ext4_warning_inode(ea_inode, 1169a4130367SJan Kara "Re-get write access err=%d", 1170a4130367SJan Kara err); 1171a4130367SJan Kara continue; 1172a4130367SJan Kara } 1173a4130367SJan Kara } 117430a7eb97STahsin Erdogan 1175dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1176dec214d0STahsin Erdogan if (err) { 1177dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", 1178dec214d0STahsin Erdogan err); 1179dec214d0STahsin Erdogan continue; 1180dec214d0STahsin Erdogan } 1181dec214d0STahsin Erdogan 1182dec214d0STahsin Erdogan if (!skip_quota) 1183a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(parent, ea_inode, 1184dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 118530a7eb97STahsin Erdogan 118630a7eb97STahsin Erdogan /* 118730a7eb97STahsin Erdogan * Forget about ea_inode within the same transaction that 118830a7eb97STahsin Erdogan * decrements the ref count. This avoids duplicate decrements in 118930a7eb97STahsin Erdogan * case the rest of the work spills over to subsequent 119030a7eb97STahsin Erdogan * transactions. 119130a7eb97STahsin Erdogan */ 119230a7eb97STahsin Erdogan entry->e_value_inum = 0; 119330a7eb97STahsin Erdogan entry->e_value_size = 0; 119430a7eb97STahsin Erdogan 119530a7eb97STahsin Erdogan dirty = true; 119630a7eb97STahsin Erdogan } 119730a7eb97STahsin Erdogan 119830a7eb97STahsin Erdogan if (dirty) { 119930a7eb97STahsin Erdogan /* 120030a7eb97STahsin Erdogan * Note that we are deliberately skipping csum calculation for 120130a7eb97STahsin Erdogan * the final update because we do not expect any journal 120230a7eb97STahsin Erdogan * restarts until xattr block is freed. 120330a7eb97STahsin Erdogan */ 120430a7eb97STahsin Erdogan 120530a7eb97STahsin Erdogan err = ext4_handle_dirty_metadata(handle, NULL, bh); 120630a7eb97STahsin Erdogan if (err) 120730a7eb97STahsin Erdogan ext4_warning_inode(parent, 120830a7eb97STahsin Erdogan "handle dirty metadata err=%d", err); 120930a7eb97STahsin Erdogan } 121030a7eb97STahsin Erdogan } 121130a7eb97STahsin Erdogan 1212ac27a0ecSDave Kleikamp /* 1213ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 1214ec4cb1aaSJan Kara * otherwise free the block. 1215ac27a0ecSDave Kleikamp */ 1216ac27a0ecSDave Kleikamp static void 1217617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 1218dec214d0STahsin Erdogan struct buffer_head *bh, 1219dec214d0STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1220dec214d0STahsin Erdogan int extra_credits) 1221ac27a0ecSDave Kleikamp { 122247387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 12236048c64bSAndreas Gruenbacher u32 hash, ref; 12248a2bfdcbSMingming Cao int error = 0; 1225ac27a0ecSDave Kleikamp 12265d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 1227188c299eSJan Kara error = ext4_journal_get_write_access(handle, inode->i_sb, bh, 1228188c299eSJan Kara EXT4_JTR_NONE); 12298a2bfdcbSMingming Cao if (error) 12308a2bfdcbSMingming Cao goto out; 12318a2bfdcbSMingming Cao 12328a2bfdcbSMingming Cao lock_buffer(bh); 12336048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 12346048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 12356048c64bSAndreas Gruenbacher if (ref == 1) { 1236ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 123782939d79SJan Kara /* 123882939d79SJan Kara * This must happen under buffer lock for 123982939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 124082939d79SJan Kara */ 1241cdb7ee4cSTahsin Erdogan if (ea_block_cache) 1242cdb7ee4cSTahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, 1243cdb7ee4cSTahsin Erdogan bh->b_blocknr); 1244ac27a0ecSDave Kleikamp get_bh(bh); 1245ec4cb1aaSJan Kara unlock_buffer(bh); 1246dec214d0STahsin Erdogan 1247dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) 1248dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, bh, 1249dec214d0STahsin Erdogan BFIRST(bh), 1250dec214d0STahsin Erdogan true /* block_csum */, 1251dec214d0STahsin Erdogan ea_inode_array, 1252dec214d0STahsin Erdogan extra_credits, 1253dec214d0STahsin Erdogan true /* skip_quota */); 1254e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 1255e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 1256e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 1257ac27a0ecSDave Kleikamp } else { 12586048c64bSAndreas Gruenbacher ref--; 12596048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 12606048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 12616048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 12626048c64bSAndreas Gruenbacher 1263cdb7ee4cSTahsin Erdogan if (ea_block_cache) { 126447387409STahsin Erdogan ce = mb_cache_entry_get(ea_block_cache, hash, 12656048c64bSAndreas Gruenbacher bh->b_blocknr); 12666048c64bSAndreas Gruenbacher if (ce) { 12676048c64bSAndreas Gruenbacher ce->e_reusable = 1; 126847387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 12696048c64bSAndreas Gruenbacher } 12706048c64bSAndreas Gruenbacher } 1271cdb7ee4cSTahsin Erdogan } 12726048c64bSAndreas Gruenbacher 1273dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bh); 1274ec4cb1aaSJan Kara /* 1275ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 1276ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 1277ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 1278ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 1279ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 1280dac7a4b4STheodore Ts'o * call ext4_handle_dirty_metadata() with locked buffer as 1281ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 1282ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 1283ec4cb1aaSJan Kara */ 1284ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 1285dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1286c1bb05a6SEric Sandeen unlock_buffer(bh); 1287ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 1288dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1289ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 12900390131bSFrank Mayhar ext4_handle_sync(handle); 12911231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 1292ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 1293ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 1294ac27a0ecSDave Kleikamp } 12958a2bfdcbSMingming Cao out: 12968a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 12978a2bfdcbSMingming Cao return; 1298ac27a0ecSDave Kleikamp } 1299ac27a0ecSDave Kleikamp 13006dd4ee7cSKalpak Shah /* 13016dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 13026dd4ee7cSKalpak Shah * bytes used by EA entries. 13036dd4ee7cSKalpak Shah */ 13046dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 13056dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 13066dd4ee7cSKalpak Shah { 13076dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1308e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 13096dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 13106dd4ee7cSKalpak Shah if (offs < *min_offs) 13116dd4ee7cSKalpak Shah *min_offs = offs; 13126dd4ee7cSKalpak Shah } 13137b1b2c1bSTheodore Ts'o if (total) 13147b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 13156dd4ee7cSKalpak Shah } 13166dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 13176dd4ee7cSKalpak Shah } 13186dd4ee7cSKalpak Shah 1319e50e5129SAndreas Dilger /* 1320e50e5129SAndreas Dilger * Write the value of the EA in an inode. 1321e50e5129SAndreas Dilger */ 1322e50e5129SAndreas Dilger static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, 1323e50e5129SAndreas Dilger const void *buf, int bufsize) 1324e50e5129SAndreas Dilger { 1325e50e5129SAndreas Dilger struct buffer_head *bh = NULL; 1326e50e5129SAndreas Dilger unsigned long block = 0; 1327dec214d0STahsin Erdogan int blocksize = ea_inode->i_sb->s_blocksize; 1328dec214d0STahsin Erdogan int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; 1329e50e5129SAndreas Dilger int csize, wsize = 0; 13304209ae12SHarshad Shirwadkar int ret = 0, ret2 = 0; 1331e50e5129SAndreas Dilger int retries = 0; 1332e50e5129SAndreas Dilger 1333e50e5129SAndreas Dilger retry: 1334e50e5129SAndreas Dilger while (ret >= 0 && ret < max_blocks) { 1335e50e5129SAndreas Dilger struct ext4_map_blocks map; 1336e50e5129SAndreas Dilger map.m_lblk = block += ret; 1337e50e5129SAndreas Dilger map.m_len = max_blocks -= ret; 1338e50e5129SAndreas Dilger 1339e50e5129SAndreas Dilger ret = ext4_map_blocks(handle, ea_inode, &map, 1340e50e5129SAndreas Dilger EXT4_GET_BLOCKS_CREATE); 1341e50e5129SAndreas Dilger if (ret <= 0) { 1342e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1343e50e5129SAndreas Dilger if (ret == -ENOSPC && 1344e50e5129SAndreas Dilger ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { 1345e50e5129SAndreas Dilger ret = 0; 1346e50e5129SAndreas Dilger goto retry; 1347e50e5129SAndreas Dilger } 1348e50e5129SAndreas Dilger break; 1349e50e5129SAndreas Dilger } 1350e50e5129SAndreas Dilger } 1351e50e5129SAndreas Dilger 1352e50e5129SAndreas Dilger if (ret < 0) 1353e50e5129SAndreas Dilger return ret; 1354e50e5129SAndreas Dilger 1355e50e5129SAndreas Dilger block = 0; 1356e50e5129SAndreas Dilger while (wsize < bufsize) { 1357e50e5129SAndreas Dilger brelse(bh); 1358e50e5129SAndreas Dilger csize = (bufsize - wsize) > blocksize ? blocksize : 1359e50e5129SAndreas Dilger bufsize - wsize; 1360e50e5129SAndreas Dilger bh = ext4_getblk(handle, ea_inode, block, 0); 1361e50e5129SAndreas Dilger if (IS_ERR(bh)) 1362e50e5129SAndreas Dilger return PTR_ERR(bh); 1363eb6984faSVasily Averin if (!bh) { 1364eb6984faSVasily Averin WARN_ON_ONCE(1); 1365eb6984faSVasily Averin EXT4_ERROR_INODE(ea_inode, 1366eb6984faSVasily Averin "ext4_getblk() return bh = NULL"); 1367eb6984faSVasily Averin return -EFSCORRUPTED; 1368eb6984faSVasily Averin } 1369188c299eSJan Kara ret = ext4_journal_get_write_access(handle, ea_inode->i_sb, bh, 1370188c299eSJan Kara EXT4_JTR_NONE); 1371e50e5129SAndreas Dilger if (ret) 1372e50e5129SAndreas Dilger goto out; 1373e50e5129SAndreas Dilger 1374e50e5129SAndreas Dilger memcpy(bh->b_data, buf, csize); 1375e50e5129SAndreas Dilger set_buffer_uptodate(bh); 1376e50e5129SAndreas Dilger ext4_handle_dirty_metadata(handle, ea_inode, bh); 1377e50e5129SAndreas Dilger 1378e50e5129SAndreas Dilger buf += csize; 1379e50e5129SAndreas Dilger wsize += csize; 1380e50e5129SAndreas Dilger block += 1; 1381e50e5129SAndreas Dilger } 1382e50e5129SAndreas Dilger 1383e50e5129SAndreas Dilger inode_lock(ea_inode); 1384e50e5129SAndreas Dilger i_size_write(ea_inode, wsize); 1385e50e5129SAndreas Dilger ext4_update_i_disksize(ea_inode, wsize); 1386e50e5129SAndreas Dilger inode_unlock(ea_inode); 1387e50e5129SAndreas Dilger 13884209ae12SHarshad Shirwadkar ret2 = ext4_mark_inode_dirty(handle, ea_inode); 13894209ae12SHarshad Shirwadkar if (unlikely(ret2 && !ret)) 13904209ae12SHarshad Shirwadkar ret = ret2; 1391e50e5129SAndreas Dilger 1392e50e5129SAndreas Dilger out: 1393e50e5129SAndreas Dilger brelse(bh); 1394e50e5129SAndreas Dilger 1395e50e5129SAndreas Dilger return ret; 1396e50e5129SAndreas Dilger } 1397e50e5129SAndreas Dilger 1398e50e5129SAndreas Dilger /* 1399e50e5129SAndreas Dilger * Create an inode to store the value of a large EA. 1400e50e5129SAndreas Dilger */ 1401e50e5129SAndreas Dilger static struct inode *ext4_xattr_inode_create(handle_t *handle, 1402dec214d0STahsin Erdogan struct inode *inode, u32 hash) 1403e50e5129SAndreas Dilger { 1404e50e5129SAndreas Dilger struct inode *ea_inode = NULL; 14059e1ba001STahsin Erdogan uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; 1406bd3b963bSTahsin Erdogan int err; 1407e50e5129SAndreas Dilger 1408e50e5129SAndreas Dilger /* 1409e50e5129SAndreas Dilger * Let the next inode be the goal, so we try and allocate the EA inode 1410e50e5129SAndreas Dilger * in the same group, or nearby one. 1411e50e5129SAndreas Dilger */ 1412e50e5129SAndreas Dilger ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, 14139e1ba001STahsin Erdogan S_IFREG | 0600, NULL, inode->i_ino + 1, owner, 14141b917ed8STahsin Erdogan EXT4_EA_INODE_FL); 1415e50e5129SAndreas Dilger if (!IS_ERR(ea_inode)) { 1416e50e5129SAndreas Dilger ea_inode->i_op = &ext4_file_inode_operations; 1417e50e5129SAndreas Dilger ea_inode->i_fop = &ext4_file_operations; 1418e50e5129SAndreas Dilger ext4_set_aops(ea_inode); 141933d201e0STahsin Erdogan ext4_xattr_inode_set_class(ea_inode); 1420e50e5129SAndreas Dilger unlock_new_inode(ea_inode); 1421dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, 1); 1422dec214d0STahsin Erdogan ext4_xattr_inode_set_hash(ea_inode, hash); 1423dec214d0STahsin Erdogan err = ext4_mark_inode_dirty(handle, ea_inode); 1424dec214d0STahsin Erdogan if (!err) 1425bd3b963bSTahsin Erdogan err = ext4_inode_attach_jinode(ea_inode); 1426bd3b963bSTahsin Erdogan if (err) { 1427bd3b963bSTahsin Erdogan iput(ea_inode); 1428bd3b963bSTahsin Erdogan return ERR_PTR(err); 1429bd3b963bSTahsin Erdogan } 1430dec214d0STahsin Erdogan 1431dec214d0STahsin Erdogan /* 1432dec214d0STahsin Erdogan * Xattr inodes are shared therefore quota charging is performed 1433dec214d0STahsin Erdogan * at a higher level. 1434dec214d0STahsin Erdogan */ 1435dec214d0STahsin Erdogan dquot_free_inode(ea_inode); 1436dec214d0STahsin Erdogan dquot_drop(ea_inode); 1437dec214d0STahsin Erdogan inode_lock(ea_inode); 1438dec214d0STahsin Erdogan ea_inode->i_flags |= S_NOQUOTA; 1439dec214d0STahsin Erdogan inode_unlock(ea_inode); 1440e50e5129SAndreas Dilger } 1441e50e5129SAndreas Dilger 1442e50e5129SAndreas Dilger return ea_inode; 1443e50e5129SAndreas Dilger } 1444e50e5129SAndreas Dilger 1445dec214d0STahsin Erdogan static struct inode * 1446dec214d0STahsin Erdogan ext4_xattr_inode_cache_find(struct inode *inode, const void *value, 1447dec214d0STahsin Erdogan size_t value_len, u32 hash) 1448e50e5129SAndreas Dilger { 1449dec214d0STahsin Erdogan struct inode *ea_inode; 1450dec214d0STahsin Erdogan struct mb_cache_entry *ce; 1451dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 1452dec214d0STahsin Erdogan void *ea_data; 1453e50e5129SAndreas Dilger 1454cdb7ee4cSTahsin Erdogan if (!ea_inode_cache) 1455cdb7ee4cSTahsin Erdogan return NULL; 1456cdb7ee4cSTahsin Erdogan 1457dec214d0STahsin Erdogan ce = mb_cache_entry_find_first(ea_inode_cache, hash); 1458dec214d0STahsin Erdogan if (!ce) 1459dec214d0STahsin Erdogan return NULL; 1460e50e5129SAndreas Dilger 1461163f0ec1SJan Kara WARN_ON_ONCE(ext4_handle_valid(journal_current_handle()) && 1462163f0ec1SJan Kara !(current->flags & PF_MEMALLOC_NOFS)); 1463163f0ec1SJan Kara 146471b565ceSTheodore Ts'o ea_data = kvmalloc(value_len, GFP_KERNEL); 1465dec214d0STahsin Erdogan if (!ea_data) { 1466dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1467dec214d0STahsin Erdogan return NULL; 1468dec214d0STahsin Erdogan } 1469dec214d0STahsin Erdogan 1470dec214d0STahsin Erdogan while (ce) { 14718a363970STheodore Ts'o ea_inode = ext4_iget(inode->i_sb, ce->e_value, 14728a363970STheodore Ts'o EXT4_IGET_NORMAL); 1473dec214d0STahsin Erdogan if (!IS_ERR(ea_inode) && 1474dec214d0STahsin Erdogan !is_bad_inode(ea_inode) && 1475dec214d0STahsin Erdogan (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && 1476dec214d0STahsin Erdogan i_size_read(ea_inode) == value_len && 1477dec214d0STahsin Erdogan !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && 1478b9fc761eSTahsin Erdogan !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, 1479dec214d0STahsin Erdogan value_len) && 1480dec214d0STahsin Erdogan !memcmp(value, ea_data, value_len)) { 1481dec214d0STahsin Erdogan mb_cache_entry_touch(ea_inode_cache, ce); 1482dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1483dec214d0STahsin Erdogan kvfree(ea_data); 1484dec214d0STahsin Erdogan return ea_inode; 1485dec214d0STahsin Erdogan } 1486dec214d0STahsin Erdogan 1487dec214d0STahsin Erdogan if (!IS_ERR(ea_inode)) 1488e50e5129SAndreas Dilger iput(ea_inode); 1489dec214d0STahsin Erdogan ce = mb_cache_entry_find_next(ea_inode_cache, ce); 1490dec214d0STahsin Erdogan } 1491dec214d0STahsin Erdogan kvfree(ea_data); 1492dec214d0STahsin Erdogan return NULL; 1493e50e5129SAndreas Dilger } 1494e50e5129SAndreas Dilger 1495e50e5129SAndreas Dilger /* 1496e50e5129SAndreas Dilger * Add value of the EA in an inode. 1497e50e5129SAndreas Dilger */ 1498dec214d0STahsin Erdogan static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, 1499dec214d0STahsin Erdogan const void *value, size_t value_len, 1500dec214d0STahsin Erdogan struct inode **ret_inode) 1501e50e5129SAndreas Dilger { 1502e50e5129SAndreas Dilger struct inode *ea_inode; 1503dec214d0STahsin Erdogan u32 hash; 1504e50e5129SAndreas Dilger int err; 1505e50e5129SAndreas Dilger 1506dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); 1507dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); 1508dec214d0STahsin Erdogan if (ea_inode) { 1509dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1510dec214d0STahsin Erdogan if (err) { 1511dec214d0STahsin Erdogan iput(ea_inode); 1512dec214d0STahsin Erdogan return err; 1513dec214d0STahsin Erdogan } 1514dec214d0STahsin Erdogan 1515dec214d0STahsin Erdogan *ret_inode = ea_inode; 1516dec214d0STahsin Erdogan return 0; 1517dec214d0STahsin Erdogan } 1518dec214d0STahsin Erdogan 1519e50e5129SAndreas Dilger /* Create an inode for the EA value */ 1520dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_create(handle, inode, hash); 1521e50e5129SAndreas Dilger if (IS_ERR(ea_inode)) 1522e50e5129SAndreas Dilger return PTR_ERR(ea_inode); 1523e50e5129SAndreas Dilger 1524e50e5129SAndreas Dilger err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); 1525dec214d0STahsin Erdogan if (err) { 1526dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref(handle, ea_inode); 1527e50e5129SAndreas Dilger iput(ea_inode); 1528e50e5129SAndreas Dilger return err; 1529e50e5129SAndreas Dilger } 1530e50e5129SAndreas Dilger 1531cdb7ee4cSTahsin Erdogan if (EA_INODE_CACHE(inode)) 1532dec214d0STahsin Erdogan mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, 1533dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 1534dec214d0STahsin Erdogan 1535dec214d0STahsin Erdogan *ret_inode = ea_inode; 1536dec214d0STahsin Erdogan return 0; 1537dec214d0STahsin Erdogan } 1538dec214d0STahsin Erdogan 15399c6e7853STahsin Erdogan /* 15409c6e7853STahsin Erdogan * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode 15419c6e7853STahsin Erdogan * feature is enabled. 15429c6e7853STahsin Erdogan */ 15439c6e7853STahsin Erdogan #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) 15449c6e7853STahsin Erdogan 1545e50e5129SAndreas Dilger static int ext4_xattr_set_entry(struct ext4_xattr_info *i, 1546e50e5129SAndreas Dilger struct ext4_xattr_search *s, 1547daf83281STahsin Erdogan handle_t *handle, struct inode *inode, 1548daf83281STahsin Erdogan bool is_block) 1549ac27a0ecSDave Kleikamp { 15505369a762STheodore Ts'o struct ext4_xattr_entry *last, *next; 1551dec214d0STahsin Erdogan struct ext4_xattr_entry *here = s->here; 1552dec214d0STahsin Erdogan size_t min_offs = s->end - s->base, name_len = strlen(i->name); 1553e50e5129SAndreas Dilger int in_inode = i->in_inode; 1554dec214d0STahsin Erdogan struct inode *old_ea_inode = NULL; 1555dec214d0STahsin Erdogan struct inode *new_ea_inode = NULL; 1556dec214d0STahsin Erdogan size_t old_size, new_size; 1557dec214d0STahsin Erdogan int ret; 1558dec214d0STahsin Erdogan 1559dec214d0STahsin Erdogan /* Space used by old and new values. */ 1560dec214d0STahsin Erdogan old_size = (!s->not_found && !here->e_value_inum) ? 1561dec214d0STahsin Erdogan EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; 1562dec214d0STahsin Erdogan new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; 1563dec214d0STahsin Erdogan 1564dec214d0STahsin Erdogan /* 1565dec214d0STahsin Erdogan * Optimization for the simple case when old and new values have the 1566dec214d0STahsin Erdogan * same padded sizes. Not applicable if external inodes are involved. 1567dec214d0STahsin Erdogan */ 1568dec214d0STahsin Erdogan if (new_size && new_size == old_size) { 1569dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1570dec214d0STahsin Erdogan void *val = s->base + offs; 1571dec214d0STahsin Erdogan 1572dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1573dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1574dec214d0STahsin Erdogan memset(val, 0, new_size); 1575dec214d0STahsin Erdogan } else { 1576dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1577dec214d0STahsin Erdogan /* Clear padding bytes. */ 1578dec214d0STahsin Erdogan memset(val + i->value_len, 0, new_size - i->value_len); 1579dec214d0STahsin Erdogan } 158032aaf194STahsin Erdogan goto update_hash; 1581dec214d0STahsin Erdogan } 1582e50e5129SAndreas Dilger 1583ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 1584ac27a0ecSDave Kleikamp last = s->first; 15855369a762STheodore Ts'o for (; !IS_LAST_ENTRY(last); last = next) { 15865369a762STheodore Ts'o next = EXT4_XATTR_NEXT(last); 15875369a762STheodore Ts'o if ((void *)next >= s->end) { 15885369a762STheodore Ts'o EXT4_ERROR_INODE(inode, "corrupted xattr entries"); 15895369a762STheodore Ts'o ret = -EFSCORRUPTED; 15905369a762STheodore Ts'o goto out; 15915369a762STheodore Ts'o } 1592e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 1593ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 1594ac27a0ecSDave Kleikamp if (offs < min_offs) 1595ac27a0ecSDave Kleikamp min_offs = offs; 1596ac27a0ecSDave Kleikamp } 1597ac27a0ecSDave Kleikamp } 1598dec214d0STahsin Erdogan 1599dec214d0STahsin Erdogan /* Check whether we have enough space. */ 1600ac27a0ecSDave Kleikamp if (i->value) { 1601dec214d0STahsin Erdogan size_t free; 1602e50e5129SAndreas Dilger 1603dec214d0STahsin Erdogan free = min_offs - ((void *)last - s->base) - sizeof(__u32); 1604dec214d0STahsin Erdogan if (!s->not_found) 1605dec214d0STahsin Erdogan free += EXT4_XATTR_LEN(name_len) + old_size; 1606e50e5129SAndreas Dilger 1607dec214d0STahsin Erdogan if (free < EXT4_XATTR_LEN(name_len) + new_size) { 1608dec214d0STahsin Erdogan ret = -ENOSPC; 1609dec214d0STahsin Erdogan goto out; 1610dec214d0STahsin Erdogan } 16119c6e7853STahsin Erdogan 16129c6e7853STahsin Erdogan /* 16139c6e7853STahsin Erdogan * If storing the value in an external inode is an option, 16149c6e7853STahsin Erdogan * reserve space for xattr entries/names in the external 16159c6e7853STahsin Erdogan * attribute block so that a long value does not occupy the 16163088e5a5SBhaskar Chowdhury * whole space and prevent further entries being added. 16179c6e7853STahsin Erdogan */ 1618daf83281STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 1619daf83281STahsin Erdogan new_size && is_block && 16209c6e7853STahsin Erdogan (min_offs + old_size - new_size) < 16219c6e7853STahsin Erdogan EXT4_XATTR_BLOCK_RESERVE(inode)) { 16229c6e7853STahsin Erdogan ret = -ENOSPC; 16239c6e7853STahsin Erdogan goto out; 16249c6e7853STahsin Erdogan } 1625ac27a0ecSDave Kleikamp } 1626ac27a0ecSDave Kleikamp 1627dec214d0STahsin Erdogan /* 1628dec214d0STahsin Erdogan * Getting access to old and new ea inodes is subject to failures. 1629dec214d0STahsin Erdogan * Finish that work before doing any modifications to the xattr data. 1630dec214d0STahsin Erdogan */ 1631dec214d0STahsin Erdogan if (!s->not_found && here->e_value_inum) { 1632dec214d0STahsin Erdogan ret = ext4_xattr_inode_iget(inode, 1633dec214d0STahsin Erdogan le32_to_cpu(here->e_value_inum), 1634a6d05676STahsin Erdogan le32_to_cpu(here->e_hash), 1635dec214d0STahsin Erdogan &old_ea_inode); 1636dec214d0STahsin Erdogan if (ret) { 1637dec214d0STahsin Erdogan old_ea_inode = NULL; 1638dec214d0STahsin Erdogan goto out; 1639bd9926e8STheodore Ts'o } 1640dec214d0STahsin Erdogan } 1641dec214d0STahsin Erdogan if (i->value && in_inode) { 1642dec214d0STahsin Erdogan WARN_ON_ONCE(!i->value_len); 1643dec214d0STahsin Erdogan 1644dec214d0STahsin Erdogan ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); 1645dec214d0STahsin Erdogan if (ret) 1646dec214d0STahsin Erdogan goto out; 1647dec214d0STahsin Erdogan 1648dec214d0STahsin Erdogan ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, 1649dec214d0STahsin Erdogan i->value_len, 1650dec214d0STahsin Erdogan &new_ea_inode); 1651dec214d0STahsin Erdogan if (ret) { 1652dec214d0STahsin Erdogan new_ea_inode = NULL; 1653a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, NULL, i->value_len); 1654dec214d0STahsin Erdogan goto out; 1655dec214d0STahsin Erdogan } 1656ac27a0ecSDave Kleikamp } 1657ac27a0ecSDave Kleikamp 1658dec214d0STahsin Erdogan if (old_ea_inode) { 1659dec214d0STahsin Erdogan /* We are ready to release ref count on the old_ea_inode. */ 1660dec214d0STahsin Erdogan ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); 1661dec214d0STahsin Erdogan if (ret) { 1662dec214d0STahsin Erdogan /* Release newly required ref count on new_ea_inode. */ 1663dec214d0STahsin Erdogan if (new_ea_inode) { 1664dec214d0STahsin Erdogan int err; 1665dec214d0STahsin Erdogan 1666dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, 1667dec214d0STahsin Erdogan new_ea_inode); 1668dec214d0STahsin Erdogan if (err) 1669dec214d0STahsin Erdogan ext4_warning_inode(new_ea_inode, 1670dec214d0STahsin Erdogan "dec ref new_ea_inode err=%d", 1671dec214d0STahsin Erdogan err); 1672a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, new_ea_inode, 1673dec214d0STahsin Erdogan i->value_len); 1674dec214d0STahsin Erdogan } 1675dec214d0STahsin Erdogan goto out; 1676dec214d0STahsin Erdogan } 1677dec214d0STahsin Erdogan 1678a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, old_ea_inode, 1679dec214d0STahsin Erdogan le32_to_cpu(here->e_value_size)); 1680dec214d0STahsin Erdogan } 1681dec214d0STahsin Erdogan 1682dec214d0STahsin Erdogan /* No failures allowed past this point. */ 1683dec214d0STahsin Erdogan 1684e5d01196STheodore Ts'o if (!s->not_found && here->e_value_size && !here->e_value_inum) { 1685ac27a0ecSDave Kleikamp /* Remove the old value. */ 1686dec214d0STahsin Erdogan void *first_val = s->base + min_offs; 1687dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1688dec214d0STahsin Erdogan void *val = s->base + offs; 1689dec214d0STahsin Erdogan 1690dec214d0STahsin Erdogan memmove(first_val + old_size, first_val, val - first_val); 1691dec214d0STahsin Erdogan memset(first_val, 0, old_size); 1692dec214d0STahsin Erdogan min_offs += old_size; 1693ac27a0ecSDave Kleikamp 1694ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 1695ac27a0ecSDave Kleikamp last = s->first; 1696ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 1697ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 1698dec214d0STahsin Erdogan 1699e50e5129SAndreas Dilger if (!last->e_value_inum && 1700e50e5129SAndreas Dilger last->e_value_size && o < offs) 1701dec214d0STahsin Erdogan last->e_value_offs = cpu_to_le16(o + old_size); 1702617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 1703ac27a0ecSDave Kleikamp } 1704ac27a0ecSDave Kleikamp } 1705dec214d0STahsin Erdogan 1706ac27a0ecSDave Kleikamp if (!i->value) { 1707dec214d0STahsin Erdogan /* Remove old name. */ 1708617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 1709dec214d0STahsin Erdogan 1710ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 1711dec214d0STahsin Erdogan memmove(here, (void *)here + size, 1712dec214d0STahsin Erdogan (void *)last - (void *)here + sizeof(__u32)); 1713ac27a0ecSDave Kleikamp memset(last, 0, size); 1714dec214d0STahsin Erdogan } else if (s->not_found) { 1715dec214d0STahsin Erdogan /* Insert new name. */ 1716dec214d0STahsin Erdogan size_t size = EXT4_XATTR_LEN(name_len); 1717dec214d0STahsin Erdogan size_t rest = (void *)last - (void *)here + sizeof(__u32); 1718dec214d0STahsin Erdogan 1719dec214d0STahsin Erdogan memmove((void *)here + size, here, rest); 1720dec214d0STahsin Erdogan memset(here, 0, size); 1721dec214d0STahsin Erdogan here->e_name_index = i->name_index; 1722dec214d0STahsin Erdogan here->e_name_len = name_len; 1723dec214d0STahsin Erdogan memcpy(here->e_name, i->name, name_len); 1724dec214d0STahsin Erdogan } else { 1725dec214d0STahsin Erdogan /* This is an update, reset value info. */ 1726dec214d0STahsin Erdogan here->e_value_inum = 0; 1727dec214d0STahsin Erdogan here->e_value_offs = 0; 1728dec214d0STahsin Erdogan here->e_value_size = 0; 1729ac27a0ecSDave Kleikamp } 1730ac27a0ecSDave Kleikamp 1731ac27a0ecSDave Kleikamp if (i->value) { 1732dec214d0STahsin Erdogan /* Insert new value. */ 1733e50e5129SAndreas Dilger if (in_inode) { 1734dec214d0STahsin Erdogan here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); 1735e50e5129SAndreas Dilger } else if (i->value_len) { 1736dec214d0STahsin Erdogan void *val = s->base + min_offs - new_size; 1737e50e5129SAndreas Dilger 1738dec214d0STahsin Erdogan here->e_value_offs = cpu_to_le16(min_offs - new_size); 1739dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1740dec214d0STahsin Erdogan memset(val, 0, new_size); 1741dec214d0STahsin Erdogan } else { 1742dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1743dec214d0STahsin Erdogan /* Clear padding bytes. */ 1744dec214d0STahsin Erdogan memset(val + i->value_len, 0, 1745dec214d0STahsin Erdogan new_size - i->value_len); 1746dec214d0STahsin Erdogan } 1747dec214d0STahsin Erdogan } 1748dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1749dec214d0STahsin Erdogan } 1750daf83281STahsin Erdogan 175132aaf194STahsin Erdogan update_hash: 1752b9fc761eSTahsin Erdogan if (i->value) { 1753b9fc761eSTahsin Erdogan __le32 hash = 0; 1754b9fc761eSTahsin Erdogan 1755b9fc761eSTahsin Erdogan /* Entry hash calculation. */ 1756b9fc761eSTahsin Erdogan if (in_inode) { 1757b9fc761eSTahsin Erdogan __le32 crc32c_hash; 1758b9fc761eSTahsin Erdogan 1759b9fc761eSTahsin Erdogan /* 1760b9fc761eSTahsin Erdogan * Feed crc32c hash instead of the raw value for entry 1761b9fc761eSTahsin Erdogan * hash calculation. This is to avoid walking 1762b9fc761eSTahsin Erdogan * potentially long value buffer again. 1763b9fc761eSTahsin Erdogan */ 1764b9fc761eSTahsin Erdogan crc32c_hash = cpu_to_le32( 1765b9fc761eSTahsin Erdogan ext4_xattr_inode_get_hash(new_ea_inode)); 1766b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1767b9fc761eSTahsin Erdogan here->e_name_len, 1768b9fc761eSTahsin Erdogan &crc32c_hash, 1); 1769b9fc761eSTahsin Erdogan } else if (is_block) { 177032aaf194STahsin Erdogan __le32 *value = s->base + le16_to_cpu( 177132aaf194STahsin Erdogan here->e_value_offs); 1772b9fc761eSTahsin Erdogan 1773b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1774b9fc761eSTahsin Erdogan here->e_name_len, value, 1775b9fc761eSTahsin Erdogan new_size >> 2); 1776daf83281STahsin Erdogan } 1777b9fc761eSTahsin Erdogan here->e_hash = hash; 1778b9fc761eSTahsin Erdogan } 1779b9fc761eSTahsin Erdogan 1780b9fc761eSTahsin Erdogan if (is_block) 1781b9fc761eSTahsin Erdogan ext4_xattr_rehash((struct ext4_xattr_header *)s->base); 1782daf83281STahsin Erdogan 1783dec214d0STahsin Erdogan ret = 0; 1784e50e5129SAndreas Dilger out: 1785dec214d0STahsin Erdogan iput(old_ea_inode); 1786dec214d0STahsin Erdogan iput(new_ea_inode); 1787dec214d0STahsin Erdogan return ret; 1788ac27a0ecSDave Kleikamp } 1789ac27a0ecSDave Kleikamp 1790617ba13bSMingming Cao struct ext4_xattr_block_find { 1791617ba13bSMingming Cao struct ext4_xattr_search s; 1792ac27a0ecSDave Kleikamp struct buffer_head *bh; 1793ac27a0ecSDave Kleikamp }; 1794ac27a0ecSDave Kleikamp 1795ac27a0ecSDave Kleikamp static int 1796617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 1797617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1798ac27a0ecSDave Kleikamp { 1799ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1800ac27a0ecSDave Kleikamp int error; 1801ac27a0ecSDave Kleikamp 1802ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 1803ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 1804ac27a0ecSDave Kleikamp 1805617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 1806ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 1807fb265c9cSTheodore Ts'o bs->bh = ext4_sb_bread(sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 18088418897fSJeffle Xu if (IS_ERR(bs->bh)) { 18098418897fSJeffle Xu error = PTR_ERR(bs->bh); 18108418897fSJeffle Xu bs->bh = NULL; 18118418897fSJeffle Xu return error; 18128418897fSJeffle Xu } 1813ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 1814ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 1815ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 1816de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bs->bh); 1817de05ca85STheodore Ts'o if (error) 1818fb265c9cSTheodore Ts'o return error; 1819ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1820ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 1821ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 1822ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 1823ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 18249496005dSTheodore Ts'o error = xattr_find_entry(inode, &bs->s.here, bs->s.end, 18259496005dSTheodore Ts'o i->name_index, i->name, 1); 1826ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1827fb265c9cSTheodore Ts'o return error; 1828ac27a0ecSDave Kleikamp bs->s.not_found = error; 1829ac27a0ecSDave Kleikamp } 1830fb265c9cSTheodore Ts'o return 0; 1831ac27a0ecSDave Kleikamp } 1832ac27a0ecSDave Kleikamp 1833ac27a0ecSDave Kleikamp static int 1834617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 1835617ba13bSMingming Cao struct ext4_xattr_info *i, 1836617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1837ac27a0ecSDave Kleikamp { 1838ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1839ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 1840b347e2bcSTahsin Erdogan struct ext4_xattr_search s_copy = bs->s; 1841b347e2bcSTahsin Erdogan struct ext4_xattr_search *s = &s_copy; 18427a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 18438a2bfdcbSMingming Cao int error = 0; 184447387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 1845a6d05676STahsin Erdogan struct inode *ea_inode = NULL, *tmp_inode; 1846a6d05676STahsin Erdogan size_t old_ea_inode_quota = 0; 1847a6d05676STahsin Erdogan unsigned int ea_ino; 1848a6d05676STahsin Erdogan 1849ac27a0ecSDave Kleikamp 1850617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 1851ac27a0ecSDave Kleikamp 1852ac27a0ecSDave Kleikamp if (s->base) { 1853*fd48e9acSJan Kara int offset = (char *)s->here - bs->bh->b_data; 1854*fd48e9acSJan Kara 18555d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 1856188c299eSJan Kara error = ext4_journal_get_write_access(handle, sb, bs->bh, 1857188c299eSJan Kara EXT4_JTR_NONE); 18588a2bfdcbSMingming Cao if (error) 18598a2bfdcbSMingming Cao goto cleanup; 18608a2bfdcbSMingming Cao lock_buffer(bs->bh); 18618a2bfdcbSMingming Cao 1862ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 186382939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 186482939d79SJan Kara 186582939d79SJan Kara /* 186682939d79SJan Kara * This must happen under buffer lock for 186782939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 186882939d79SJan Kara * block 186982939d79SJan Kara */ 1870cdb7ee4cSTahsin Erdogan if (ea_block_cache) 187147387409STahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, 187282939d79SJan Kara bs->bh->b_blocknr); 1873ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 1874daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 1875daf83281STahsin Erdogan true /* is_block */); 1876dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bs->bh); 1877ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 18786a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1879ac27a0ecSDave Kleikamp goto bad_block; 1880ac27a0ecSDave Kleikamp if (!error) 1881dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 18820390131bSFrank Mayhar inode, 1883ac27a0ecSDave Kleikamp bs->bh); 1884ac27a0ecSDave Kleikamp if (error) 1885ac27a0ecSDave Kleikamp goto cleanup; 1886ac27a0ecSDave Kleikamp goto inserted; 1887*fd48e9acSJan Kara } 18888a2bfdcbSMingming Cao unlock_buffer(bs->bh); 1889ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 18904efd9f0dSShuqi Zhang s->base = kmemdup(BHDR(bs->bh), bs->bh->b_size, GFP_NOFS); 1891ac27a0ecSDave Kleikamp error = -ENOMEM; 1892ac27a0ecSDave Kleikamp if (s->base == NULL) 1893ac27a0ecSDave Kleikamp goto cleanup; 1894ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1895ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1896ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 1897ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 1898dec214d0STahsin Erdogan 1899dec214d0STahsin Erdogan /* 1900dec214d0STahsin Erdogan * If existing entry points to an xattr inode, we need 1901dec214d0STahsin Erdogan * to prevent ext4_xattr_set_entry() from decrementing 1902dec214d0STahsin Erdogan * ref count on it because the reference belongs to the 1903dec214d0STahsin Erdogan * original block. In this case, make the entry look 1904dec214d0STahsin Erdogan * like it has an empty value. 1905dec214d0STahsin Erdogan */ 1906dec214d0STahsin Erdogan if (!s->not_found && s->here->e_value_inum) { 1907a6d05676STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 1908a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, 1909a6d05676STahsin Erdogan le32_to_cpu(s->here->e_hash), 1910a6d05676STahsin Erdogan &tmp_inode); 1911a6d05676STahsin Erdogan if (error) 1912a6d05676STahsin Erdogan goto cleanup; 1913a6d05676STahsin Erdogan 1914a6d05676STahsin Erdogan if (!ext4_test_inode_state(tmp_inode, 1915a6d05676STahsin Erdogan EXT4_STATE_LUSTRE_EA_INODE)) { 1916dec214d0STahsin Erdogan /* 1917a6d05676STahsin Erdogan * Defer quota free call for previous 1918a6d05676STahsin Erdogan * inode until success is guaranteed. 1919dec214d0STahsin Erdogan */ 1920a6d05676STahsin Erdogan old_ea_inode_quota = le32_to_cpu( 1921dec214d0STahsin Erdogan s->here->e_value_size); 1922a6d05676STahsin Erdogan } 1923a6d05676STahsin Erdogan iput(tmp_inode); 1924a6d05676STahsin Erdogan 1925dec214d0STahsin Erdogan s->here->e_value_inum = 0; 1926dec214d0STahsin Erdogan s->here->e_value_size = 0; 1927dec214d0STahsin Erdogan } 1928ac27a0ecSDave Kleikamp } else { 1929ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 1930216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 1931ac27a0ecSDave Kleikamp error = -ENOMEM; 1932ac27a0ecSDave Kleikamp if (s->base == NULL) 1933ac27a0ecSDave Kleikamp goto cleanup; 1934617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 1935ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 1936ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1937ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1938ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 1939ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 1940ac27a0ecSDave Kleikamp } 1941ac27a0ecSDave Kleikamp 1942daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); 19436a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1944ac27a0ecSDave Kleikamp goto bad_block; 1945ac27a0ecSDave Kleikamp if (error) 1946ac27a0ecSDave Kleikamp goto cleanup; 1947dec214d0STahsin Erdogan 1948dec214d0STahsin Erdogan if (i->value && s->here->e_value_inum) { 1949dec214d0STahsin Erdogan /* 1950dec214d0STahsin Erdogan * A ref count on ea_inode has been taken as part of the call to 1951dec214d0STahsin Erdogan * ext4_xattr_set_entry() above. We would like to drop this 1952dec214d0STahsin Erdogan * extra ref but we have to wait until the xattr block is 1953dec214d0STahsin Erdogan * initialized and has its own ref count on the ea_inode. 1954dec214d0STahsin Erdogan */ 1955dec214d0STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 1956a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, 1957a6d05676STahsin Erdogan le32_to_cpu(s->here->e_hash), 1958a6d05676STahsin Erdogan &ea_inode); 1959dec214d0STahsin Erdogan if (error) { 1960dec214d0STahsin Erdogan ea_inode = NULL; 1961dec214d0STahsin Erdogan goto cleanup; 1962dec214d0STahsin Erdogan } 1963dec214d0STahsin Erdogan } 1964dec214d0STahsin Erdogan 1965ac27a0ecSDave Kleikamp inserted: 1966ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 196747387409STahsin Erdogan new_bh = ext4_xattr_block_cache_find(inode, header(s->base), 196847387409STahsin Erdogan &ce); 1969ac27a0ecSDave Kleikamp if (new_bh) { 1970ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 1971ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 1972ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 1973ac27a0ecSDave Kleikamp else { 19746048c64bSAndreas Gruenbacher u32 ref; 19756048c64bSAndreas Gruenbacher 1976b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 1977b8cb5a54STahsin Erdogan 1978ac27a0ecSDave Kleikamp /* The old block is released after updating 1979ac27a0ecSDave Kleikamp the inode. */ 19801231b3a1SLukas Czerner error = dquot_alloc_block(inode, 19811231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 19825dd4056dSChristoph Hellwig if (error) 1983ac27a0ecSDave Kleikamp goto cleanup; 19845d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 1985188c299eSJan Kara error = ext4_journal_get_write_access( 1986188c299eSJan Kara handle, sb, new_bh, 1987188c299eSJan Kara EXT4_JTR_NONE); 1988ac27a0ecSDave Kleikamp if (error) 1989ac27a0ecSDave Kleikamp goto cleanup_dquot; 1990ac27a0ecSDave Kleikamp lock_buffer(new_bh); 199182939d79SJan Kara /* 199282939d79SJan Kara * We have to be careful about races with 19936048c64bSAndreas Gruenbacher * freeing, rehashing or adding references to 19946048c64bSAndreas Gruenbacher * xattr block. Once we hold buffer lock xattr 19956048c64bSAndreas Gruenbacher * block's state is stable so we can check 19966048c64bSAndreas Gruenbacher * whether the block got freed / rehashed or 19976048c64bSAndreas Gruenbacher * not. Since we unhash mbcache entry under 19986048c64bSAndreas Gruenbacher * buffer lock when freeing / rehashing xattr 19996048c64bSAndreas Gruenbacher * block, checking whether entry is still 20006048c64bSAndreas Gruenbacher * hashed is reliable. Same rules hold for 20016048c64bSAndreas Gruenbacher * e_reusable handling. 200282939d79SJan Kara */ 20036048c64bSAndreas Gruenbacher if (hlist_bl_unhashed(&ce->e_hash_list) || 20046048c64bSAndreas Gruenbacher !ce->e_reusable) { 200582939d79SJan Kara /* 200682939d79SJan Kara * Undo everything and check mbcache 200782939d79SJan Kara * again. 200882939d79SJan Kara */ 200982939d79SJan Kara unlock_buffer(new_bh); 201082939d79SJan Kara dquot_free_block(inode, 201182939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 201282939d79SJan Kara 1)); 201382939d79SJan Kara brelse(new_bh); 201447387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 201582939d79SJan Kara ce = NULL; 201682939d79SJan Kara new_bh = NULL; 201782939d79SJan Kara goto inserted; 201882939d79SJan Kara } 20196048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 20206048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 20216048c64bSAndreas Gruenbacher if (ref >= EXT4_XATTR_REFCOUNT_MAX) 20226048c64bSAndreas Gruenbacher ce->e_reusable = 0; 2023ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 20246048c64bSAndreas Gruenbacher ref); 2025dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2026ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2027dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 20280390131bSFrank Mayhar inode, 2029ac27a0ecSDave Kleikamp new_bh); 2030ac27a0ecSDave Kleikamp if (error) 2031ac27a0ecSDave Kleikamp goto cleanup_dquot; 2032ac27a0ecSDave Kleikamp } 203347387409STahsin Erdogan mb_cache_entry_touch(ea_block_cache, ce); 203447387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2035ac27a0ecSDave Kleikamp ce = NULL; 2036ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 2037ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 2038ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 2039ec000220STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); 2040ac27a0ecSDave Kleikamp new_bh = bs->bh; 2041ac27a0ecSDave Kleikamp get_bh(new_bh); 2042ac27a0ecSDave Kleikamp } else { 2043ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 2044fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 2045fb0a387dSEric Sandeen 2046b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 2047b8cb5a54STahsin Erdogan 2048fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 2049d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 2050fb0a387dSEric Sandeen 2051fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 205212e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 2053fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 2054fb0a387dSEric Sandeen 205555f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 205655f020dbSAllison Henderson NULL, &error); 2057ac27a0ecSDave Kleikamp if (error) 2058ac27a0ecSDave Kleikamp goto cleanup; 2059fb0a387dSEric Sandeen 206012e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 2061fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 2062fb0a387dSEric Sandeen 2063ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 2064ace36ad4SJoe Perches (unsigned long long)block); 2065ac27a0ecSDave Kleikamp 2066ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 2067aebf0243SWang Shilong if (unlikely(!new_bh)) { 2068860d21e2STheodore Ts'o error = -ENOMEM; 2069ac27a0ecSDave Kleikamp getblk_failed: 20707dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 2071e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 2072ac27a0ecSDave Kleikamp goto cleanup; 2073ac27a0ecSDave Kleikamp } 2074dec214d0STahsin Erdogan error = ext4_xattr_inode_inc_ref_all(handle, inode, 2075dec214d0STahsin Erdogan ENTRY(header(s->base)+1)); 2076dec214d0STahsin Erdogan if (error) 2077dec214d0STahsin Erdogan goto getblk_failed; 2078dec214d0STahsin Erdogan if (ea_inode) { 2079dec214d0STahsin Erdogan /* Drop the extra ref on ea_inode. */ 2080dec214d0STahsin Erdogan error = ext4_xattr_inode_dec_ref(handle, 2081dec214d0STahsin Erdogan ea_inode); 2082dec214d0STahsin Erdogan if (error) 2083dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 2084dec214d0STahsin Erdogan "dec ref error=%d", 2085dec214d0STahsin Erdogan error); 2086dec214d0STahsin Erdogan iput(ea_inode); 2087dec214d0STahsin Erdogan ea_inode = NULL; 2088dec214d0STahsin Erdogan } 2089dec214d0STahsin Erdogan 2090ac27a0ecSDave Kleikamp lock_buffer(new_bh); 2091188c299eSJan Kara error = ext4_journal_get_create_access(handle, sb, 2092188c299eSJan Kara new_bh, EXT4_JTR_NONE); 2093ac27a0ecSDave Kleikamp if (error) { 2094ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2095860d21e2STheodore Ts'o error = -EIO; 2096ac27a0ecSDave Kleikamp goto getblk_failed; 2097ac27a0ecSDave Kleikamp } 2098ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 2099dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2100ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 2101ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 210247387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, new_bh); 2103dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, 2104dac7a4b4STheodore Ts'o new_bh); 2105ac27a0ecSDave Kleikamp if (error) 2106ac27a0ecSDave Kleikamp goto cleanup; 2107ac27a0ecSDave Kleikamp } 2108ac27a0ecSDave Kleikamp } 2109ac27a0ecSDave Kleikamp 2110a6d05676STahsin Erdogan if (old_ea_inode_quota) 2111a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, NULL, old_ea_inode_quota); 2112dec214d0STahsin Erdogan 2113ac27a0ecSDave Kleikamp /* Update the inode. */ 2114617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 2115ac27a0ecSDave Kleikamp 2116ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 2117dec214d0STahsin Erdogan if (bs->bh && bs->bh != new_bh) { 2118dec214d0STahsin Erdogan struct ext4_xattr_inode_array *ea_inode_array = NULL; 2119dec214d0STahsin Erdogan 2120dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bs->bh, 2121dec214d0STahsin Erdogan &ea_inode_array, 2122dec214d0STahsin Erdogan 0 /* extra_credits */); 2123dec214d0STahsin Erdogan ext4_xattr_inode_array_free(ea_inode_array); 2124dec214d0STahsin Erdogan } 2125ac27a0ecSDave Kleikamp error = 0; 2126ac27a0ecSDave Kleikamp 2127ac27a0ecSDave Kleikamp cleanup: 2128dec214d0STahsin Erdogan if (ea_inode) { 2129dec214d0STahsin Erdogan int error2; 2130dec214d0STahsin Erdogan 2131dec214d0STahsin Erdogan error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); 2132dec214d0STahsin Erdogan if (error2) 2133dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "dec ref error=%d", 2134dec214d0STahsin Erdogan error2); 2135dec214d0STahsin Erdogan 2136dec214d0STahsin Erdogan /* If there was an error, revert the quota charge. */ 2137dec214d0STahsin Erdogan if (error) 2138a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, ea_inode, 2139dec214d0STahsin Erdogan i_size_read(ea_inode)); 2140dec214d0STahsin Erdogan iput(ea_inode); 2141dec214d0STahsin Erdogan } 2142ac27a0ecSDave Kleikamp if (ce) 214347387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2144ac27a0ecSDave Kleikamp brelse(new_bh); 2145ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 2146ac27a0ecSDave Kleikamp kfree(s->base); 2147ac27a0ecSDave Kleikamp 2148ac27a0ecSDave Kleikamp return error; 2149ac27a0ecSDave Kleikamp 2150ac27a0ecSDave Kleikamp cleanup_dquot: 21511231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 2152ac27a0ecSDave Kleikamp goto cleanup; 2153ac27a0ecSDave Kleikamp 2154ac27a0ecSDave Kleikamp bad_block: 215524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 215624676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2157ac27a0ecSDave Kleikamp goto cleanup; 2158ac27a0ecSDave Kleikamp 2159ac27a0ecSDave Kleikamp #undef header 2160ac27a0ecSDave Kleikamp } 2161ac27a0ecSDave Kleikamp 2162879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 2163617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2164ac27a0ecSDave Kleikamp { 2165617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2166617ba13bSMingming Cao struct ext4_inode *raw_inode; 2167ac27a0ecSDave Kleikamp int error; 2168ac27a0ecSDave Kleikamp 216967d7d8adSBaokun Li if (!EXT4_INODE_HAS_XATTR_SPACE(inode)) 2170ac27a0ecSDave Kleikamp return 0; 217167d7d8adSBaokun Li 2172617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 2173ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 2174ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 2175ac27a0ecSDave Kleikamp is->s.here = is->s.first; 2176617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 217719f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 21789e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 2179ac27a0ecSDave Kleikamp if (error) 2180ac27a0ecSDave Kleikamp return error; 2181ac27a0ecSDave Kleikamp /* Find the named attribute. */ 21829496005dSTheodore Ts'o error = xattr_find_entry(inode, &is->s.here, is->s.end, 21839496005dSTheodore Ts'o i->name_index, i->name, 0); 2184ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 2185ac27a0ecSDave Kleikamp return error; 2186ac27a0ecSDave Kleikamp is->s.not_found = error; 2187ac27a0ecSDave Kleikamp } 2188ac27a0ecSDave Kleikamp return 0; 2189ac27a0ecSDave Kleikamp } 2190ac27a0ecSDave Kleikamp 2191310c097cSRitesh Harjani int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 2192617ba13bSMingming Cao struct ext4_xattr_info *i, 2193617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2194ac27a0ecSDave Kleikamp { 2195617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2196617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 2197ac27a0ecSDave Kleikamp int error; 2198ac27a0ecSDave Kleikamp 219967d7d8adSBaokun Li if (!EXT4_INODE_HAS_XATTR_SPACE(inode)) 2200ac27a0ecSDave Kleikamp return -ENOSPC; 220167d7d8adSBaokun Li 2202daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 2203ac27a0ecSDave Kleikamp if (error) 2204ac27a0ecSDave Kleikamp return error; 2205617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 2206ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 2207617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 220819f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 2209ac27a0ecSDave Kleikamp } else { 2210ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 221119f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 2212ac27a0ecSDave Kleikamp } 2213ac27a0ecSDave Kleikamp return 0; 2214ac27a0ecSDave Kleikamp } 2215ac27a0ecSDave Kleikamp 22163fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 22173fd16462SJan Kara struct ext4_xattr_info *i) 22183fd16462SJan Kara { 22193fd16462SJan Kara void *value; 22203fd16462SJan Kara 22210bd454c0STahsin Erdogan /* When e_value_inum is set the value is stored externally. */ 22220bd454c0STahsin Erdogan if (s->here->e_value_inum) 22230bd454c0STahsin Erdogan return 0; 22243fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 22253fd16462SJan Kara return 0; 22263fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 22273fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 22283fd16462SJan Kara } 22293fd16462SJan Kara 2230dec214d0STahsin Erdogan static struct buffer_head *ext4_xattr_get_block(struct inode *inode) 2231dec214d0STahsin Erdogan { 2232dec214d0STahsin Erdogan struct buffer_head *bh; 2233dec214d0STahsin Erdogan int error; 2234dec214d0STahsin Erdogan 2235dec214d0STahsin Erdogan if (!EXT4_I(inode)->i_file_acl) 2236dec214d0STahsin Erdogan return NULL; 2237fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2238fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 2239fb265c9cSTheodore Ts'o return bh; 2240dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2241ecaaf408SVasily Averin if (error) { 2242ecaaf408SVasily Averin brelse(bh); 2243dec214d0STahsin Erdogan return ERR_PTR(error); 2244ecaaf408SVasily Averin } 2245dec214d0STahsin Erdogan return bh; 2246dec214d0STahsin Erdogan } 2247dec214d0STahsin Erdogan 2248ac27a0ecSDave Kleikamp /* 2249617ba13bSMingming Cao * ext4_xattr_set_handle() 2250ac27a0ecSDave Kleikamp * 22516e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 2252ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 2253ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 2254ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 2255ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 2256ac27a0ecSDave Kleikamp * previous to the call, respectively. 2257ac27a0ecSDave Kleikamp * 2258ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2259ac27a0ecSDave Kleikamp */ 2260ac27a0ecSDave Kleikamp int 2261617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 2262ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 2263ac27a0ecSDave Kleikamp int flags) 2264ac27a0ecSDave Kleikamp { 2265617ba13bSMingming Cao struct ext4_xattr_info i = { 2266ac27a0ecSDave Kleikamp .name_index = name_index, 2267ac27a0ecSDave Kleikamp .name = name, 2268ac27a0ecSDave Kleikamp .value = value, 2269ac27a0ecSDave Kleikamp .value_len = value_len, 2270e50e5129SAndreas Dilger .in_inode = 0, 2271ac27a0ecSDave Kleikamp }; 2272617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 2273ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2274ac27a0ecSDave Kleikamp }; 2275617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 2276ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2277ac27a0ecSDave Kleikamp }; 2278c755e251STheodore Ts'o int no_expand; 2279ac27a0ecSDave Kleikamp int error; 2280ac27a0ecSDave Kleikamp 2281ac27a0ecSDave Kleikamp if (!name) 2282ac27a0ecSDave Kleikamp return -EINVAL; 2283ac27a0ecSDave Kleikamp if (strlen(name) > 255) 2284ac27a0ecSDave Kleikamp return -ERANGE; 2285b8cb5a54STahsin Erdogan 2286c755e251STheodore Ts'o ext4_write_lock_xattr(inode, &no_expand); 22874d20c685SKalpak Shah 2288c1a5d5f6STahsin Erdogan /* Check journal credits under write lock. */ 2289c1a5d5f6STahsin Erdogan if (ext4_handle_valid(handle)) { 2290dec214d0STahsin Erdogan struct buffer_head *bh; 2291c1a5d5f6STahsin Erdogan int credits; 2292c1a5d5f6STahsin Erdogan 2293dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2294dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2295dec214d0STahsin Erdogan error = PTR_ERR(bh); 2296dec214d0STahsin Erdogan goto cleanup; 2297dec214d0STahsin Erdogan } 2298dec214d0STahsin Erdogan 2299af65207cSTahsin Erdogan credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2300af65207cSTahsin Erdogan value_len, 2301af65207cSTahsin Erdogan flags & XATTR_CREATE); 2302dec214d0STahsin Erdogan brelse(bh); 2303dec214d0STahsin Erdogan 2304a9a8344eSJan Kara if (jbd2_handle_buffer_credits(handle) < credits) { 2305c1a5d5f6STahsin Erdogan error = -ENOSPC; 2306c1a5d5f6STahsin Erdogan goto cleanup; 2307c1a5d5f6STahsin Erdogan } 2308163f0ec1SJan Kara WARN_ON_ONCE(!(current->flags & PF_MEMALLOC_NOFS)); 2309c1a5d5f6STahsin Erdogan } 2310c1a5d5f6STahsin Erdogan 231166543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 231286ebfd08SEric Sandeen if (error) 231386ebfd08SEric Sandeen goto cleanup; 231486ebfd08SEric Sandeen 231519f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 2316617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 2317617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 231819f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 2319ac27a0ecSDave Kleikamp } 2320ac27a0ecSDave Kleikamp 2321617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 2322ac27a0ecSDave Kleikamp if (error) 2323ac27a0ecSDave Kleikamp goto cleanup; 2324ac27a0ecSDave Kleikamp if (is.s.not_found) 2325617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 2326ac27a0ecSDave Kleikamp if (error) 2327ac27a0ecSDave Kleikamp goto cleanup; 2328ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 2329ac27a0ecSDave Kleikamp error = -ENODATA; 2330ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 2331ac27a0ecSDave Kleikamp goto cleanup; 2332ac27a0ecSDave Kleikamp error = 0; 2333ac27a0ecSDave Kleikamp if (!value) 2334ac27a0ecSDave Kleikamp goto cleanup; 2335ac27a0ecSDave Kleikamp } else { 2336ac27a0ecSDave Kleikamp error = -EEXIST; 2337ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 2338ac27a0ecSDave Kleikamp goto cleanup; 2339ac27a0ecSDave Kleikamp } 2340dec214d0STahsin Erdogan 2341ac27a0ecSDave Kleikamp if (!value) { 2342ac27a0ecSDave Kleikamp if (!is.s.not_found) 2343e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2344ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 2345617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2346ac27a0ecSDave Kleikamp } else { 23473fd16462SJan Kara error = 0; 23483fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 23493fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 23503fd16462SJan Kara goto cleanup; 23513fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 23523fd16462SJan Kara goto cleanup; 23533fd16462SJan Kara 2354b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2355b347e2bcSTahsin Erdogan (EXT4_XATTR_SIZE(i.value_len) > 2356b347e2bcSTahsin Erdogan EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) 2357b347e2bcSTahsin Erdogan i.in_inode = 1; 2358b347e2bcSTahsin Erdogan retry_inode: 2359e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2360ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 2361ac27a0ecSDave Kleikamp i.value = NULL; 2362617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2363ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 23647e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 236545ae932dSVasily Averin brelse(bs.bh); 236645ae932dSVasily Averin bs.bh = NULL; 23677e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 23687e01c8e5STiger Yang if (error) 23697e01c8e5STiger Yang goto cleanup; 23707e01c8e5STiger Yang } 2371617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2372b347e2bcSTahsin Erdogan if (!error && !is.s.not_found) { 2373ac27a0ecSDave Kleikamp i.value = NULL; 2374e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, 2375e50e5129SAndreas Dilger &is); 2376b347e2bcSTahsin Erdogan } else if (error == -ENOSPC) { 2377b347e2bcSTahsin Erdogan /* 2378b347e2bcSTahsin Erdogan * Xattr does not fit in the block, store at 2379b347e2bcSTahsin Erdogan * external inode if possible. 2380b347e2bcSTahsin Erdogan */ 2381b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 23826b224899Szhangyi (F) i.value_len && !i.in_inode) { 2383b347e2bcSTahsin Erdogan i.in_inode = 1; 2384b347e2bcSTahsin Erdogan goto retry_inode; 2385b347e2bcSTahsin Erdogan } 2386ac27a0ecSDave Kleikamp } 2387ac27a0ecSDave Kleikamp } 2388ac27a0ecSDave Kleikamp } 2389ac27a0ecSDave Kleikamp if (!error) { 2390617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 2391eeca7ea1SDeepa Dinamani inode->i_ctime = current_time(inode); 23926dd4ee7cSKalpak Shah if (!value) 2393c755e251STheodore Ts'o no_expand = 0; 2394617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 2395ac27a0ecSDave Kleikamp /* 2396617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 2397ac27a0ecSDave Kleikamp * error != 0. 2398ac27a0ecSDave Kleikamp */ 2399ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 2400ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 24010390131bSFrank Mayhar ext4_handle_sync(handle); 2402ac27a0ecSDave Kleikamp } 2403e85c81baSXin Yin ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, handle); 2404ac27a0ecSDave Kleikamp 2405ac27a0ecSDave Kleikamp cleanup: 2406ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 2407ac27a0ecSDave Kleikamp brelse(bs.bh); 2408c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 2409ac27a0ecSDave Kleikamp return error; 2410ac27a0ecSDave Kleikamp } 2411ac27a0ecSDave Kleikamp 2412af65207cSTahsin Erdogan int ext4_xattr_set_credits(struct inode *inode, size_t value_len, 2413af65207cSTahsin Erdogan bool is_create, int *credits) 2414c1a5d5f6STahsin Erdogan { 2415dec214d0STahsin Erdogan struct buffer_head *bh; 2416dec214d0STahsin Erdogan int err; 2417c1a5d5f6STahsin Erdogan 2418dec214d0STahsin Erdogan *credits = 0; 2419dec214d0STahsin Erdogan 2420dec214d0STahsin Erdogan if (!EXT4_SB(inode->i_sb)->s_journal) 2421c1a5d5f6STahsin Erdogan return 0; 2422c1a5d5f6STahsin Erdogan 2423dec214d0STahsin Erdogan down_read(&EXT4_I(inode)->xattr_sem); 2424c1a5d5f6STahsin Erdogan 2425dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2426dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2427dec214d0STahsin Erdogan err = PTR_ERR(bh); 2428dec214d0STahsin Erdogan } else { 2429af65207cSTahsin Erdogan *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2430af65207cSTahsin Erdogan value_len, is_create); 2431dec214d0STahsin Erdogan brelse(bh); 2432dec214d0STahsin Erdogan err = 0; 2433c1a5d5f6STahsin Erdogan } 2434dec214d0STahsin Erdogan 2435dec214d0STahsin Erdogan up_read(&EXT4_I(inode)->xattr_sem); 2436dec214d0STahsin Erdogan return err; 2437c1a5d5f6STahsin Erdogan } 2438c1a5d5f6STahsin Erdogan 2439ac27a0ecSDave Kleikamp /* 2440617ba13bSMingming Cao * ext4_xattr_set() 2441ac27a0ecSDave Kleikamp * 2442617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 2443ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 2444ac27a0ecSDave Kleikamp * 2445ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2446ac27a0ecSDave Kleikamp */ 2447ac27a0ecSDave Kleikamp int 2448617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 2449ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 2450ac27a0ecSDave Kleikamp { 2451ac27a0ecSDave Kleikamp handle_t *handle; 2452e50e5129SAndreas Dilger struct super_block *sb = inode->i_sb; 2453ac27a0ecSDave Kleikamp int error, retries = 0; 2454c1a5d5f6STahsin Erdogan int credits; 2455ac27a0ecSDave Kleikamp 2456b8cb5a54STahsin Erdogan error = dquot_initialize(inode); 2457b8cb5a54STahsin Erdogan if (error) 2458b8cb5a54STahsin Erdogan return error; 2459e50e5129SAndreas Dilger 2460ac27a0ecSDave Kleikamp retry: 2461af65207cSTahsin Erdogan error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, 2462af65207cSTahsin Erdogan &credits); 2463dec214d0STahsin Erdogan if (error) 2464dec214d0STahsin Erdogan return error; 2465dec214d0STahsin Erdogan 24669924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 2467ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 2468ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 2469ac27a0ecSDave Kleikamp } else { 2470ac27a0ecSDave Kleikamp int error2; 2471ac27a0ecSDave Kleikamp 2472617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 2473ac27a0ecSDave Kleikamp value, value_len, flags); 2474617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 2475ac27a0ecSDave Kleikamp if (error == -ENOSPC && 2476e50e5129SAndreas Dilger ext4_should_retry_alloc(sb, &retries)) 2477ac27a0ecSDave Kleikamp goto retry; 2478ac27a0ecSDave Kleikamp if (error == 0) 2479ac27a0ecSDave Kleikamp error = error2; 2480ac27a0ecSDave Kleikamp } 2481e85c81baSXin Yin ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, NULL); 2482ac27a0ecSDave Kleikamp 2483ac27a0ecSDave Kleikamp return error; 2484ac27a0ecSDave Kleikamp } 2485ac27a0ecSDave Kleikamp 2486ac27a0ecSDave Kleikamp /* 24876dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 24886dd4ee7cSKalpak Shah * i_extra_isize. 24896dd4ee7cSKalpak Shah */ 24906dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 24916dd4ee7cSKalpak Shah int value_offs_shift, void *to, 249294405713SJan Kara void *from, size_t n) 24936dd4ee7cSKalpak Shah { 24946dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 24956dd4ee7cSKalpak Shah int new_offs; 24966dd4ee7cSKalpak Shah 249794405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 249894405713SJan Kara BUG_ON(value_offs_shift > 0); 249994405713SJan Kara 25006dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 25016dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 2502e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 25036dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 25046dd4ee7cSKalpak Shah value_offs_shift; 25056dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 25066dd4ee7cSKalpak Shah } 25076dd4ee7cSKalpak Shah } 25086dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 25096dd4ee7cSKalpak Shah memmove(to, from, n); 25106dd4ee7cSKalpak Shah } 25116dd4ee7cSKalpak Shah 25126dd4ee7cSKalpak Shah /* 25133f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 25143f2571c1SJan Kara */ 25153f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 25163f2571c1SJan Kara struct ext4_inode *raw_inode, 25173f2571c1SJan Kara struct ext4_xattr_entry *entry) 25183f2571c1SJan Kara { 25193f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 25203f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 25213f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 2522f6109100STahsin Erdogan size_t value_size = le32_to_cpu(entry->e_value_size); 25233f2571c1SJan Kara struct ext4_xattr_info i = { 25243f2571c1SJan Kara .value = NULL, 25253f2571c1SJan Kara .value_len = 0, 25263f2571c1SJan Kara .name_index = entry->e_name_index, 2527f6109100STahsin Erdogan .in_inode = !!entry->e_value_inum, 25283f2571c1SJan Kara }; 25293f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 25303f2571c1SJan Kara int error; 25313f2571c1SJan Kara 25323f2571c1SJan Kara is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 25333f2571c1SJan Kara bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 25343f2571c1SJan Kara buffer = kmalloc(value_size, GFP_NOFS); 25353f2571c1SJan Kara b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 25363f2571c1SJan Kara if (!is || !bs || !buffer || !b_entry_name) { 25373f2571c1SJan Kara error = -ENOMEM; 25383f2571c1SJan Kara goto out; 25393f2571c1SJan Kara } 25403f2571c1SJan Kara 25413f2571c1SJan Kara is->s.not_found = -ENODATA; 25423f2571c1SJan Kara bs->s.not_found = -ENODATA; 25433f2571c1SJan Kara is->iloc.bh = NULL; 25443f2571c1SJan Kara bs->bh = NULL; 25453f2571c1SJan Kara 25463f2571c1SJan Kara /* Save the entry name and the entry value */ 2547f6109100STahsin Erdogan if (entry->e_value_inum) { 2548b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, value_size); 2549f6109100STahsin Erdogan if (error) 2550f6109100STahsin Erdogan goto out; 2551f6109100STahsin Erdogan } else { 2552f6109100STahsin Erdogan size_t value_offs = le16_to_cpu(entry->e_value_offs); 25533f2571c1SJan Kara memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); 2554f6109100STahsin Erdogan } 2555f6109100STahsin Erdogan 25563f2571c1SJan Kara memcpy(b_entry_name, entry->e_name, entry->e_name_len); 25573f2571c1SJan Kara b_entry_name[entry->e_name_len] = '\0'; 25583f2571c1SJan Kara i.name = b_entry_name; 25593f2571c1SJan Kara 25603f2571c1SJan Kara error = ext4_get_inode_loc(inode, &is->iloc); 25613f2571c1SJan Kara if (error) 25623f2571c1SJan Kara goto out; 25633f2571c1SJan Kara 25643f2571c1SJan Kara error = ext4_xattr_ibody_find(inode, &i, is); 25653f2571c1SJan Kara if (error) 25663f2571c1SJan Kara goto out; 25673f2571c1SJan Kara 25683f2571c1SJan Kara /* Remove the chosen entry from the inode */ 2569e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, is); 25703f2571c1SJan Kara if (error) 25713f2571c1SJan Kara goto out; 25723f2571c1SJan Kara 25733f2571c1SJan Kara i.value = buffer; 25743f2571c1SJan Kara i.value_len = value_size; 25753f2571c1SJan Kara error = ext4_xattr_block_find(inode, &i, bs); 25763f2571c1SJan Kara if (error) 25773f2571c1SJan Kara goto out; 25783f2571c1SJan Kara 25793f2571c1SJan Kara /* Add entry which was removed from the inode into the block */ 25803f2571c1SJan Kara error = ext4_xattr_block_set(handle, inode, &i, bs); 25813f2571c1SJan Kara if (error) 25823f2571c1SJan Kara goto out; 25833f2571c1SJan Kara error = 0; 25843f2571c1SJan Kara out: 25853f2571c1SJan Kara kfree(b_entry_name); 25863f2571c1SJan Kara kfree(buffer); 25873f2571c1SJan Kara if (is) 25883f2571c1SJan Kara brelse(is->iloc.bh); 25896bdc9977SVasily Averin if (bs) 25906bdc9977SVasily Averin brelse(bs->bh); 25913f2571c1SJan Kara kfree(is); 25923f2571c1SJan Kara kfree(bs); 25933f2571c1SJan Kara 25943f2571c1SJan Kara return error; 25953f2571c1SJan Kara } 25963f2571c1SJan Kara 2597dfa2064bSJan Kara static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, 2598dfa2064bSJan Kara struct ext4_inode *raw_inode, 2599dfa2064bSJan Kara int isize_diff, size_t ifree, 2600dfa2064bSJan Kara size_t bfree, int *total_ino) 2601dfa2064bSJan Kara { 2602dfa2064bSJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 2603dfa2064bSJan Kara struct ext4_xattr_entry *small_entry; 2604dfa2064bSJan Kara struct ext4_xattr_entry *entry; 2605dfa2064bSJan Kara struct ext4_xattr_entry *last; 2606dfa2064bSJan Kara unsigned int entry_size; /* EA entry size */ 2607dfa2064bSJan Kara unsigned int total_size; /* EA entry size + value size */ 2608dfa2064bSJan Kara unsigned int min_total_size; 2609dfa2064bSJan Kara int error; 2610dfa2064bSJan Kara 2611dfa2064bSJan Kara while (isize_diff > ifree) { 2612dfa2064bSJan Kara entry = NULL; 2613dfa2064bSJan Kara small_entry = NULL; 2614dfa2064bSJan Kara min_total_size = ~0U; 2615dfa2064bSJan Kara last = IFIRST(header); 2616dfa2064bSJan Kara /* Find the entry best suited to be pushed into EA block */ 2617dfa2064bSJan Kara for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 26188cdb5240STheodore Ts'o /* never move system.data out of the inode */ 26198cdb5240STheodore Ts'o if ((last->e_name_len == 4) && 26208cdb5240STheodore Ts'o (last->e_name_index == EXT4_XATTR_INDEX_SYSTEM) && 26218cdb5240STheodore Ts'o !memcmp(last->e_name, "data", 4)) 26228cdb5240STheodore Ts'o continue; 26239bb21cedSTahsin Erdogan total_size = EXT4_XATTR_LEN(last->e_name_len); 26249bb21cedSTahsin Erdogan if (!last->e_value_inum) 26259bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 26269bb21cedSTahsin Erdogan le32_to_cpu(last->e_value_size)); 2627dfa2064bSJan Kara if (total_size <= bfree && 2628dfa2064bSJan Kara total_size < min_total_size) { 2629dfa2064bSJan Kara if (total_size + ifree < isize_diff) { 2630dfa2064bSJan Kara small_entry = last; 2631dfa2064bSJan Kara } else { 2632dfa2064bSJan Kara entry = last; 2633dfa2064bSJan Kara min_total_size = total_size; 2634dfa2064bSJan Kara } 2635dfa2064bSJan Kara } 2636dfa2064bSJan Kara } 2637dfa2064bSJan Kara 2638dfa2064bSJan Kara if (entry == NULL) { 2639dfa2064bSJan Kara if (small_entry == NULL) 2640dfa2064bSJan Kara return -ENOSPC; 2641dfa2064bSJan Kara entry = small_entry; 2642dfa2064bSJan Kara } 2643dfa2064bSJan Kara 2644dfa2064bSJan Kara entry_size = EXT4_XATTR_LEN(entry->e_name_len); 26459bb21cedSTahsin Erdogan total_size = entry_size; 26469bb21cedSTahsin Erdogan if (!entry->e_value_inum) 26479bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 26489bb21cedSTahsin Erdogan le32_to_cpu(entry->e_value_size)); 2649dfa2064bSJan Kara error = ext4_xattr_move_to_block(handle, inode, raw_inode, 2650dfa2064bSJan Kara entry); 2651dfa2064bSJan Kara if (error) 2652dfa2064bSJan Kara return error; 2653dfa2064bSJan Kara 2654dfa2064bSJan Kara *total_ino -= entry_size; 2655dfa2064bSJan Kara ifree += total_size; 2656dfa2064bSJan Kara bfree -= total_size; 2657dfa2064bSJan Kara } 2658dfa2064bSJan Kara 2659dfa2064bSJan Kara return 0; 2660dfa2064bSJan Kara } 2661dfa2064bSJan Kara 26623f2571c1SJan Kara /* 26636dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 26646dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 26656dd4ee7cSKalpak Shah */ 26666dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 26676dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 26686dd4ee7cSKalpak Shah { 26696dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 2670cf0a5e81SMiao Xie struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 2671cf0a5e81SMiao Xie static unsigned int mnt_count; 2672e3014d14SJan Kara size_t min_offs; 2673e3014d14SJan Kara size_t ifree, bfree; 26747b1b2c1bSTheodore Ts'o int total_ino; 26756e0cd088SJan Kara void *base, *end; 2676d0141191SJan Kara int error = 0, tried_min_extra_isize = 0; 2677cf0a5e81SMiao Xie int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); 2678d0141191SJan Kara int isize_diff; /* How much do we need to grow i_extra_isize */ 2679c755e251STheodore Ts'o 26806dd4ee7cSKalpak Shah retry: 2681d0141191SJan Kara isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; 26822e81a4eeSJan Kara if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) 2683b640b2c5SMiao Xie return 0; 26846dd4ee7cSKalpak Shah 26856dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 26866dd4ee7cSKalpak Shah 26876dd4ee7cSKalpak Shah /* 26886dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 26896dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 26906dd4ee7cSKalpak Shah */ 26916dd4ee7cSKalpak Shah 26926e0cd088SJan Kara base = IFIRST(header); 26936dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 26946dd4ee7cSKalpak Shah min_offs = end - base; 2695a805622aSTheodore Ts'o total_ino = sizeof(struct ext4_xattr_ibody_header) + sizeof(u32); 26966dd4ee7cSKalpak Shah 26979e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 26989e92f48cSTheodore Ts'o if (error) 26999e92f48cSTheodore Ts'o goto cleanup; 27009e92f48cSTheodore Ts'o 27016e0cd088SJan Kara ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); 2702e3014d14SJan Kara if (ifree >= isize_diff) 2703e3014d14SJan Kara goto shift; 27046dd4ee7cSKalpak Shah 27056dd4ee7cSKalpak Shah /* 27066dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 27076dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 27086dd4ee7cSKalpak Shah */ 27096dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 271053692ec0SVasily Averin struct buffer_head *bh; 271153692ec0SVasily Averin 2712fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2713fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 2714fb265c9cSTheodore Ts'o error = PTR_ERR(bh); 27156dd4ee7cSKalpak Shah goto cleanup; 2716fb265c9cSTheodore Ts'o } 2717de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 271853692ec0SVasily Averin if (error) { 271953692ec0SVasily Averin brelse(bh); 27206dd4ee7cSKalpak Shah goto cleanup; 272153692ec0SVasily Averin } 27226dd4ee7cSKalpak Shah base = BHDR(bh); 27236dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 27246dd4ee7cSKalpak Shah min_offs = end - base; 27256e0cd088SJan Kara bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, 27266e0cd088SJan Kara NULL); 2727b640b2c5SMiao Xie brelse(bh); 2728e3014d14SJan Kara if (bfree + ifree < isize_diff) { 27296dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 27306dd4ee7cSKalpak Shah tried_min_extra_isize++; 27316dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 27326dd4ee7cSKalpak Shah goto retry; 27336dd4ee7cSKalpak Shah } 2734dfa2064bSJan Kara error = -ENOSPC; 27356dd4ee7cSKalpak Shah goto cleanup; 27366dd4ee7cSKalpak Shah } 27376dd4ee7cSKalpak Shah } else { 2738e3014d14SJan Kara bfree = inode->i_sb->s_blocksize; 27396dd4ee7cSKalpak Shah } 27406dd4ee7cSKalpak Shah 2741dfa2064bSJan Kara error = ext4_xattr_make_inode_space(handle, inode, raw_inode, 2742dfa2064bSJan Kara isize_diff, ifree, bfree, 2743dfa2064bSJan Kara &total_ino); 2744dfa2064bSJan Kara if (error) { 2745dfa2064bSJan Kara if (error == -ENOSPC && !tried_min_extra_isize && 27466dd4ee7cSKalpak Shah s_min_extra_isize) { 27476dd4ee7cSKalpak Shah tried_min_extra_isize++; 27486dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 27496dd4ee7cSKalpak Shah goto retry; 27506dd4ee7cSKalpak Shah } 27516dd4ee7cSKalpak Shah goto cleanup; 27526dd4ee7cSKalpak Shah } 2753e3014d14SJan Kara shift: 2754e3014d14SJan Kara /* Adjust the offsets and shift the remaining entries ahead */ 27556e0cd088SJan Kara ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize 2756e3014d14SJan Kara - new_extra_isize, (void *)raw_inode + 2757e3014d14SJan Kara EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 275894405713SJan Kara (void *)header, total_ino); 2759e3014d14SJan Kara EXT4_I(inode)->i_extra_isize = new_extra_isize; 27606dd4ee7cSKalpak Shah 27616dd4ee7cSKalpak Shah cleanup: 2762b640b2c5SMiao Xie if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) { 2763cf0a5e81SMiao Xie ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", 2764cf0a5e81SMiao Xie inode->i_ino); 2765cf0a5e81SMiao Xie mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); 2766cf0a5e81SMiao Xie } 27676dd4ee7cSKalpak Shah return error; 27686dd4ee7cSKalpak Shah } 27696dd4ee7cSKalpak Shah 2770e50e5129SAndreas Dilger #define EIA_INCR 16 /* must be 2^n */ 2771e50e5129SAndreas Dilger #define EIA_MASK (EIA_INCR - 1) 2772dec214d0STahsin Erdogan 2773dec214d0STahsin Erdogan /* Add the large xattr @inode into @ea_inode_array for deferred iput(). 27740421a189STahsin Erdogan * If @ea_inode_array is new or full it will be grown and the old 2775e50e5129SAndreas Dilger * contents copied over. 2776e50e5129SAndreas Dilger */ 2777e50e5129SAndreas Dilger static int 27780421a189STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 27790421a189STahsin Erdogan struct inode *inode) 2780e50e5129SAndreas Dilger { 27810421a189STahsin Erdogan if (*ea_inode_array == NULL) { 2782e50e5129SAndreas Dilger /* 2783e50e5129SAndreas Dilger * Start with 15 inodes, so it fits into a power-of-two size. 27840421a189STahsin Erdogan * If *ea_inode_array is NULL, this is essentially offsetof() 2785e50e5129SAndreas Dilger */ 27860421a189STahsin Erdogan (*ea_inode_array) = 27870421a189STahsin Erdogan kmalloc(offsetof(struct ext4_xattr_inode_array, 27880421a189STahsin Erdogan inodes[EIA_MASK]), 2789e50e5129SAndreas Dilger GFP_NOFS); 27900421a189STahsin Erdogan if (*ea_inode_array == NULL) 2791e50e5129SAndreas Dilger return -ENOMEM; 27920421a189STahsin Erdogan (*ea_inode_array)->count = 0; 27930421a189STahsin Erdogan } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { 2794e50e5129SAndreas Dilger /* expand the array once all 15 + n * 16 slots are full */ 27950421a189STahsin Erdogan struct ext4_xattr_inode_array *new_array = NULL; 27960421a189STahsin Erdogan int count = (*ea_inode_array)->count; 2797e50e5129SAndreas Dilger 2798e50e5129SAndreas Dilger /* if new_array is NULL, this is essentially offsetof() */ 2799e50e5129SAndreas Dilger new_array = kmalloc( 28000421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, 28010421a189STahsin Erdogan inodes[count + EIA_INCR]), 2802e50e5129SAndreas Dilger GFP_NOFS); 2803e50e5129SAndreas Dilger if (new_array == NULL) 2804e50e5129SAndreas Dilger return -ENOMEM; 28050421a189STahsin Erdogan memcpy(new_array, *ea_inode_array, 28060421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, inodes[count])); 28070421a189STahsin Erdogan kfree(*ea_inode_array); 28080421a189STahsin Erdogan *ea_inode_array = new_array; 2809e50e5129SAndreas Dilger } 28100421a189STahsin Erdogan (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; 2811e50e5129SAndreas Dilger return 0; 2812e50e5129SAndreas Dilger } 2813e50e5129SAndreas Dilger 28146dd4ee7cSKalpak Shah /* 2815617ba13bSMingming Cao * ext4_xattr_delete_inode() 2816ac27a0ecSDave Kleikamp * 2817e50e5129SAndreas Dilger * Free extended attribute resources associated with this inode. Traverse 2818dec214d0STahsin Erdogan * all entries and decrement reference on any xattr inodes associated with this 2819dec214d0STahsin Erdogan * inode. This is called immediately before an inode is freed. We have exclusive 2820dec214d0STahsin Erdogan * access to the inode. If an orphan inode is deleted it will also release its 2821dec214d0STahsin Erdogan * references on xattr block and xattr inodes. 2822ac27a0ecSDave Kleikamp */ 2823dec214d0STahsin Erdogan int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, 282430a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 282530a7eb97STahsin Erdogan int extra_credits) 2826ac27a0ecSDave Kleikamp { 2827ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 2828e50e5129SAndreas Dilger struct ext4_xattr_ibody_header *header; 282930a7eb97STahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 2830dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 2831a6d05676STahsin Erdogan struct inode *ea_inode; 283230a7eb97STahsin Erdogan int error; 283330a7eb97STahsin Erdogan 283483448bdfSJan Kara error = ext4_journal_ensure_credits(handle, extra_credits, 283583448bdfSJan Kara ext4_free_metadata_revoke_credits(inode->i_sb, 1)); 2836a4130367SJan Kara if (error < 0) { 283730a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); 283830a7eb97STahsin Erdogan goto cleanup; 283930a7eb97STahsin Erdogan } 2840ac27a0ecSDave Kleikamp 2841dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2842dec214d0STahsin Erdogan ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 2843e50e5129SAndreas Dilger 2844e50e5129SAndreas Dilger error = ext4_get_inode_loc(inode, &iloc); 2845dec214d0STahsin Erdogan if (error) { 2846dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); 2847e50e5129SAndreas Dilger goto cleanup; 2848e50e5129SAndreas Dilger } 2849dec214d0STahsin Erdogan 2850188c299eSJan Kara error = ext4_journal_get_write_access(handle, inode->i_sb, 2851188c299eSJan Kara iloc.bh, EXT4_JTR_NONE); 2852dec214d0STahsin Erdogan if (error) { 2853dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "write access (error %d)", 2854dec214d0STahsin Erdogan error); 2855dec214d0STahsin Erdogan goto cleanup; 2856dec214d0STahsin Erdogan } 2857dec214d0STahsin Erdogan 2858dec214d0STahsin Erdogan header = IHDR(inode, ext4_raw_inode(&iloc)); 2859dec214d0STahsin Erdogan if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) 2860dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, 2861dec214d0STahsin Erdogan IFIRST(header), 2862dec214d0STahsin Erdogan false /* block_csum */, 2863dec214d0STahsin Erdogan ea_inode_array, 2864dec214d0STahsin Erdogan extra_credits, 2865dec214d0STahsin Erdogan false /* skip_quota */); 2866dec214d0STahsin Erdogan } 2867dec214d0STahsin Erdogan 2868dec214d0STahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 2869fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2870fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 2871fb265c9cSTheodore Ts'o error = PTR_ERR(bh); 2872878520acSTheodore Ts'o if (error == -EIO) { 287354d3adbcSTheodore Ts'o EXT4_ERROR_INODE_ERR(inode, EIO, 287454d3adbcSTheodore Ts'o "block %llu read error", 287524676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2876878520acSTheodore Ts'o } 28777159a986SDan Carpenter bh = NULL; 2878ac27a0ecSDave Kleikamp goto cleanup; 2879ac27a0ecSDave Kleikamp } 2880dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2881de05ca85STheodore Ts'o if (error) 2882ac27a0ecSDave Kleikamp goto cleanup; 2883e50e5129SAndreas Dilger 288430a7eb97STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) { 2885dec214d0STahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 2886a6d05676STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 2887a6d05676STahsin Erdogan if (!entry->e_value_inum) 2888a6d05676STahsin Erdogan continue; 2889a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, 2890a6d05676STahsin Erdogan le32_to_cpu(entry->e_value_inum), 2891a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 2892a6d05676STahsin Erdogan &ea_inode); 2893a6d05676STahsin Erdogan if (error) 2894a6d05676STahsin Erdogan continue; 2895a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, ea_inode, 2896dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 2897a6d05676STahsin Erdogan iput(ea_inode); 2898a6d05676STahsin Erdogan } 2899dec214d0STahsin Erdogan 2900e50e5129SAndreas Dilger } 2901e50e5129SAndreas Dilger 2902dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bh, ea_inode_array, 2903dec214d0STahsin Erdogan extra_credits); 2904dec214d0STahsin Erdogan /* 2905dec214d0STahsin Erdogan * Update i_file_acl value in the same transaction that releases 2906dec214d0STahsin Erdogan * block. 2907dec214d0STahsin Erdogan */ 2908617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 290930a7eb97STahsin Erdogan error = ext4_mark_inode_dirty(handle, inode); 291030a7eb97STahsin Erdogan if (error) { 291130a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", 291230a7eb97STahsin Erdogan error); 291330a7eb97STahsin Erdogan goto cleanup; 291430a7eb97STahsin Erdogan } 2915e85c81baSXin Yin ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, handle); 2916dec214d0STahsin Erdogan } 2917dec214d0STahsin Erdogan error = 0; 2918ac27a0ecSDave Kleikamp cleanup: 291930a7eb97STahsin Erdogan brelse(iloc.bh); 2920ac27a0ecSDave Kleikamp brelse(bh); 2921e50e5129SAndreas Dilger return error; 2922e50e5129SAndreas Dilger } 2923e50e5129SAndreas Dilger 29240421a189STahsin Erdogan void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) 2925e50e5129SAndreas Dilger { 2926dec214d0STahsin Erdogan int idx; 2927e50e5129SAndreas Dilger 29280421a189STahsin Erdogan if (ea_inode_array == NULL) 2929e50e5129SAndreas Dilger return; 2930e50e5129SAndreas Dilger 2931dec214d0STahsin Erdogan for (idx = 0; idx < ea_inode_array->count; ++idx) 2932dec214d0STahsin Erdogan iput(ea_inode_array->inodes[idx]); 29330421a189STahsin Erdogan kfree(ea_inode_array); 2934ac27a0ecSDave Kleikamp } 2935ac27a0ecSDave Kleikamp 2936ac27a0ecSDave Kleikamp /* 293747387409STahsin Erdogan * ext4_xattr_block_cache_insert() 2938ac27a0ecSDave Kleikamp * 293947387409STahsin Erdogan * Create a new entry in the extended attribute block cache, and insert 2940ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 2941ac27a0ecSDave Kleikamp * 2942ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2943ac27a0ecSDave Kleikamp */ 2944ac27a0ecSDave Kleikamp static void 294547387409STahsin Erdogan ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, 294647387409STahsin Erdogan struct buffer_head *bh) 2947ac27a0ecSDave Kleikamp { 29486048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 29496048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 29506048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 29516048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 2952ac27a0ecSDave Kleikamp int error; 2953ac27a0ecSDave Kleikamp 2954cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 2955cdb7ee4cSTahsin Erdogan return; 295647387409STahsin Erdogan error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, 29576048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 2958ac27a0ecSDave Kleikamp if (error) { 295982939d79SJan Kara if (error == -EBUSY) 2960ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 296182939d79SJan Kara } else 2962ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 2963ac27a0ecSDave Kleikamp } 2964ac27a0ecSDave Kleikamp 2965ac27a0ecSDave Kleikamp /* 2966617ba13bSMingming Cao * ext4_xattr_cmp() 2967ac27a0ecSDave Kleikamp * 2968ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 2969ac27a0ecSDave Kleikamp * 2970ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 2971ac27a0ecSDave Kleikamp * a negative error number on errors. 2972ac27a0ecSDave Kleikamp */ 2973ac27a0ecSDave Kleikamp static int 2974617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 2975617ba13bSMingming Cao struct ext4_xattr_header *header2) 2976ac27a0ecSDave Kleikamp { 2977617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 2978ac27a0ecSDave Kleikamp 2979ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 2980ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 2981ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 2982ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 2983ac27a0ecSDave Kleikamp return 1; 2984ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 2985ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 2986ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 2987ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 2988e50e5129SAndreas Dilger entry1->e_value_inum != entry2->e_value_inum || 2989ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 2990ac27a0ecSDave Kleikamp return 1; 29917cec1918STahsin Erdogan if (!entry1->e_value_inum && 29927cec1918STahsin Erdogan memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 2993ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 2994ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 2995ac27a0ecSDave Kleikamp return 1; 2996ac27a0ecSDave Kleikamp 2997617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 2998617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 2999ac27a0ecSDave Kleikamp } 3000ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 3001ac27a0ecSDave Kleikamp return 1; 3002ac27a0ecSDave Kleikamp return 0; 3003ac27a0ecSDave Kleikamp } 3004ac27a0ecSDave Kleikamp 3005ac27a0ecSDave Kleikamp /* 300647387409STahsin Erdogan * ext4_xattr_block_cache_find() 3007ac27a0ecSDave Kleikamp * 3008ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 3009ac27a0ecSDave Kleikamp * 3010ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 3011ac27a0ecSDave Kleikamp * not found or an error occurred. 3012ac27a0ecSDave Kleikamp */ 3013ac27a0ecSDave Kleikamp static struct buffer_head * 301447387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *inode, 301547387409STahsin Erdogan struct ext4_xattr_header *header, 30167a2508e1SJan Kara struct mb_cache_entry **pce) 3017ac27a0ecSDave Kleikamp { 3018ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 30197a2508e1SJan Kara struct mb_cache_entry *ce; 302047387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 3021ac27a0ecSDave Kleikamp 3022cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 3023cdb7ee4cSTahsin Erdogan return NULL; 3024ac27a0ecSDave Kleikamp if (!header->h_hash) 3025ac27a0ecSDave Kleikamp return NULL; /* never share */ 3026ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 302747387409STahsin Erdogan ce = mb_cache_entry_find_first(ea_block_cache, hash); 3028ac27a0ecSDave Kleikamp while (ce) { 3029ac27a0ecSDave Kleikamp struct buffer_head *bh; 3030ac27a0ecSDave Kleikamp 3031fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, ce->e_value, REQ_PRIO); 3032fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 3033fb265c9cSTheodore Ts'o if (PTR_ERR(bh) == -ENOMEM) 3034fb265c9cSTheodore Ts'o return NULL; 30357159a986SDan Carpenter bh = NULL; 303624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 3037c07dfcb4STahsin Erdogan (unsigned long)ce->e_value); 3038617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 3039ac27a0ecSDave Kleikamp *pce = ce; 3040ac27a0ecSDave Kleikamp return bh; 3041ac27a0ecSDave Kleikamp } 3042ac27a0ecSDave Kleikamp brelse(bh); 304347387409STahsin Erdogan ce = mb_cache_entry_find_next(ea_block_cache, ce); 3044ac27a0ecSDave Kleikamp } 3045ac27a0ecSDave Kleikamp return NULL; 3046ac27a0ecSDave Kleikamp } 3047ac27a0ecSDave Kleikamp 3048ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 3049ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 3050ac27a0ecSDave Kleikamp 3051ac27a0ecSDave Kleikamp /* 3052617ba13bSMingming Cao * ext4_xattr_hash_entry() 3053ac27a0ecSDave Kleikamp * 3054ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 3055ac27a0ecSDave Kleikamp */ 3056b9fc761eSTahsin Erdogan static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, 3057b9fc761eSTahsin Erdogan size_t value_count) 3058ac27a0ecSDave Kleikamp { 3059ac27a0ecSDave Kleikamp __u32 hash = 0; 3060ac27a0ecSDave Kleikamp 3061b9fc761eSTahsin Erdogan while (name_len--) { 3062ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 3063ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 3064ac27a0ecSDave Kleikamp *name++; 3065ac27a0ecSDave Kleikamp } 3066b9fc761eSTahsin Erdogan while (value_count--) { 3067ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 3068ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 3069ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 3070ac27a0ecSDave Kleikamp } 3071b9fc761eSTahsin Erdogan return cpu_to_le32(hash); 3072ac27a0ecSDave Kleikamp } 3073ac27a0ecSDave Kleikamp 3074ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 3075ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 3076ac27a0ecSDave Kleikamp 3077ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 3078ac27a0ecSDave Kleikamp 3079ac27a0ecSDave Kleikamp /* 3080617ba13bSMingming Cao * ext4_xattr_rehash() 3081ac27a0ecSDave Kleikamp * 3082ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 3083ac27a0ecSDave Kleikamp */ 3084daf83281STahsin Erdogan static void ext4_xattr_rehash(struct ext4_xattr_header *header) 3085ac27a0ecSDave Kleikamp { 3086617ba13bSMingming Cao struct ext4_xattr_entry *here; 3087ac27a0ecSDave Kleikamp __u32 hash = 0; 3088ac27a0ecSDave Kleikamp 3089ac27a0ecSDave Kleikamp here = ENTRY(header+1); 3090ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 3091ac27a0ecSDave Kleikamp if (!here->e_hash) { 3092ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 3093ac27a0ecSDave Kleikamp hash = 0; 3094ac27a0ecSDave Kleikamp break; 3095ac27a0ecSDave Kleikamp } 3096ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 3097ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 3098ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 3099617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 3100ac27a0ecSDave Kleikamp } 3101ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 3102ac27a0ecSDave Kleikamp } 3103ac27a0ecSDave Kleikamp 3104ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 3105ac27a0ecSDave Kleikamp 31069c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 31079c191f70ST Makphaibulchoke 31087a2508e1SJan Kara struct mb_cache * 310982939d79SJan Kara ext4_xattr_create_cache(void) 3110ac27a0ecSDave Kleikamp { 31117a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 3112ac27a0ecSDave Kleikamp } 3113ac27a0ecSDave Kleikamp 31147a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 3115ac27a0ecSDave Kleikamp { 31169c191f70ST Makphaibulchoke if (cache) 31177a2508e1SJan Kara mb_cache_destroy(cache); 3118ac27a0ecSDave Kleikamp } 31199c191f70ST Makphaibulchoke 3120