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 96ac27a0ecSDave Kleikamp }; 97ac27a0ecSDave Kleikamp 9811e27528SStephen Hemminger const struct xattr_handler *ext4_xattr_handlers[] = { 99617ba13bSMingming Cao &ext4_xattr_user_handler, 100617ba13bSMingming Cao &ext4_xattr_trusted_handler, 10103010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 10264e178a7SChristoph Hellwig &posix_acl_access_xattr_handler, 10364e178a7SChristoph Hellwig &posix_acl_default_xattr_handler, 104ac27a0ecSDave Kleikamp #endif 10503010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 106617ba13bSMingming Cao &ext4_xattr_security_handler, 107ac27a0ecSDave Kleikamp #endif 108ac27a0ecSDave Kleikamp NULL 109ac27a0ecSDave Kleikamp }; 110ac27a0ecSDave Kleikamp 11147387409STahsin Erdogan #define EA_BLOCK_CACHE(inode) (((struct ext4_sb_info *) \ 11247387409STahsin Erdogan inode->i_sb->s_fs_info)->s_ea_block_cache) 1139c191f70ST Makphaibulchoke 114dec214d0STahsin Erdogan #define EA_INODE_CACHE(inode) (((struct ext4_sb_info *) \ 115dec214d0STahsin Erdogan inode->i_sb->s_fs_info)->s_ea_inode_cache) 116dec214d0STahsin Erdogan 11730a7eb97STahsin Erdogan static int 11830a7eb97STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 11930a7eb97STahsin Erdogan struct inode *inode); 12030a7eb97STahsin Erdogan 12133d201e0STahsin Erdogan #ifdef CONFIG_LOCKDEP 12233d201e0STahsin Erdogan void ext4_xattr_inode_set_class(struct inode *ea_inode) 12333d201e0STahsin Erdogan { 12433d201e0STahsin Erdogan lockdep_set_subclass(&ea_inode->i_rwsem, 1); 12533d201e0STahsin Erdogan } 12633d201e0STahsin Erdogan #endif 12733d201e0STahsin Erdogan 128cc8e94fdSDarrick J. Wong static __le32 ext4_xattr_block_csum(struct inode *inode, 129cc8e94fdSDarrick J. Wong sector_t block_nr, 130cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 131cc8e94fdSDarrick J. Wong { 132cc8e94fdSDarrick J. Wong struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 133d6a77105STheodore Ts'o __u32 csum; 134d6a77105STheodore Ts'o __le64 dsk_block_nr = cpu_to_le64(block_nr); 135b47820edSDaeho Jeong __u32 dummy_csum = 0; 136b47820edSDaeho Jeong int offset = offsetof(struct ext4_xattr_header, h_checksum); 137cc8e94fdSDarrick J. Wong 138d6a77105STheodore Ts'o csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, 139d6a77105STheodore Ts'o sizeof(dsk_block_nr)); 140b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); 141b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); 142b47820edSDaeho Jeong offset += sizeof(dummy_csum); 143b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, 144b47820edSDaeho Jeong EXT4_BLOCK_SIZE(inode->i_sb) - offset); 14541eb70ddSTao Ma 146cc8e94fdSDarrick J. Wong return cpu_to_le32(csum); 147cc8e94fdSDarrick J. Wong } 148cc8e94fdSDarrick J. Wong 149cc8e94fdSDarrick J. Wong static int ext4_xattr_block_csum_verify(struct inode *inode, 150dac7a4b4STheodore Ts'o struct buffer_head *bh) 151cc8e94fdSDarrick J. Wong { 152dac7a4b4STheodore Ts'o struct ext4_xattr_header *hdr = BHDR(bh); 153dac7a4b4STheodore Ts'o int ret = 1; 154dac7a4b4STheodore Ts'o 155dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) { 156dac7a4b4STheodore Ts'o lock_buffer(bh); 157dac7a4b4STheodore Ts'o ret = (hdr->h_checksum == ext4_xattr_block_csum(inode, 158dac7a4b4STheodore Ts'o bh->b_blocknr, hdr)); 159dac7a4b4STheodore Ts'o unlock_buffer(bh); 160dac7a4b4STheodore Ts'o } 161dac7a4b4STheodore Ts'o return ret; 162cc8e94fdSDarrick J. Wong } 163cc8e94fdSDarrick J. Wong 164cc8e94fdSDarrick J. Wong static void ext4_xattr_block_csum_set(struct inode *inode, 165cc8e94fdSDarrick J. Wong struct buffer_head *bh) 166cc8e94fdSDarrick J. Wong { 167dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) 168dac7a4b4STheodore Ts'o BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode, 169dac7a4b4STheodore Ts'o bh->b_blocknr, BHDR(bh)); 170cc8e94fdSDarrick J. Wong } 171cc8e94fdSDarrick J. Wong 17211e27528SStephen Hemminger static inline const struct xattr_handler * 173617ba13bSMingming Cao ext4_xattr_handler(int name_index) 174ac27a0ecSDave Kleikamp { 17511e27528SStephen Hemminger const struct xattr_handler *handler = NULL; 176ac27a0ecSDave Kleikamp 177617ba13bSMingming Cao if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) 178617ba13bSMingming Cao handler = ext4_xattr_handler_map[name_index]; 179ac27a0ecSDave Kleikamp return handler; 180ac27a0ecSDave Kleikamp } 181ac27a0ecSDave Kleikamp 182ac27a0ecSDave Kleikamp static int 1832c4f9923SEric Biggers ext4_xattr_check_entries(struct ext4_xattr_entry *entry, void *end, 184a0626e75SDarrick J. Wong void *value_start) 185ac27a0ecSDave Kleikamp { 186a0626e75SDarrick J. Wong struct ext4_xattr_entry *e = entry; 187a0626e75SDarrick J. Wong 188d7614cc1SEric Biggers /* Find the end of the names list */ 189a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(e)) { 190a0626e75SDarrick J. Wong struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); 191ac27a0ecSDave Kleikamp if ((void *)next >= end) 1926a797d27SDarrick J. Wong return -EFSCORRUPTED; 1937d95178cSTheodore Ts'o if (strnlen(e->e_name, e->e_name_len) != e->e_name_len) 1947d95178cSTheodore Ts'o return -EFSCORRUPTED; 195a0626e75SDarrick J. Wong e = next; 196ac27a0ecSDave Kleikamp } 197a0626e75SDarrick J. Wong 198d7614cc1SEric Biggers /* Check the values */ 199a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(entry)) { 200d7614cc1SEric Biggers u32 size = le32_to_cpu(entry->e_value_size); 201ce3fd194SEric Biggers 20254dd0e0aSTheodore Ts'o if (size > EXT4_XATTR_SIZE_MAX) 203ce3fd194SEric Biggers return -EFSCORRUPTED; 204ce3fd194SEric Biggers 205ce3fd194SEric Biggers if (size != 0 && entry->e_value_inum == 0) { 206ce3fd194SEric Biggers u16 offs = le16_to_cpu(entry->e_value_offs); 207d7614cc1SEric Biggers void *value; 208d7614cc1SEric Biggers 209d7614cc1SEric Biggers /* 210d7614cc1SEric Biggers * The value cannot overlap the names, and the value 211d7614cc1SEric Biggers * with padding cannot extend beyond 'end'. Check both 212d7614cc1SEric Biggers * the padded and unpadded sizes, since the size may 213d7614cc1SEric Biggers * overflow to 0 when adding padding. 214d7614cc1SEric Biggers */ 215d7614cc1SEric Biggers if (offs > end - value_start) 2166a797d27SDarrick J. Wong return -EFSCORRUPTED; 217d7614cc1SEric Biggers value = value_start + offs; 218d7614cc1SEric Biggers if (value < (void *)e + sizeof(u32) || 219d7614cc1SEric Biggers size > end - value || 220d7614cc1SEric Biggers EXT4_XATTR_SIZE(size) > end - value) 221d7614cc1SEric Biggers return -EFSCORRUPTED; 222d7614cc1SEric Biggers } 223a0626e75SDarrick J. Wong entry = EXT4_XATTR_NEXT(entry); 224a0626e75SDarrick J. Wong } 225a0626e75SDarrick J. Wong 226ac27a0ecSDave Kleikamp return 0; 227ac27a0ecSDave Kleikamp } 228ac27a0ecSDave Kleikamp 229ac27a0ecSDave Kleikamp static inline int 230de05ca85STheodore Ts'o __ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh, 231de05ca85STheodore Ts'o const char *function, unsigned int line) 232ac27a0ecSDave Kleikamp { 233de05ca85STheodore Ts'o int error = -EFSCORRUPTED; 234cc8e94fdSDarrick J. Wong 235617ba13bSMingming Cao if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 236ac27a0ecSDave Kleikamp BHDR(bh)->h_blocks != cpu_to_le32(1)) 237de05ca85STheodore Ts'o goto errout; 238513f86d7STheodore Ts'o if (buffer_verified(bh)) 239513f86d7STheodore Ts'o return 0; 240513f86d7STheodore Ts'o 241de05ca85STheodore Ts'o error = -EFSBADCRC; 242dac7a4b4STheodore Ts'o if (!ext4_xattr_block_csum_verify(inode, bh)) 243de05ca85STheodore Ts'o goto errout; 2442c4f9923SEric Biggers error = ext4_xattr_check_entries(BFIRST(bh), bh->b_data + bh->b_size, 245a0626e75SDarrick J. Wong bh->b_data); 246de05ca85STheodore Ts'o errout: 247de05ca85STheodore Ts'o if (error) 248de05ca85STheodore Ts'o __ext4_error_inode(inode, function, line, 0, 249de05ca85STheodore Ts'o "corrupted xattr block %llu", 250de05ca85STheodore Ts'o (unsigned long long) bh->b_blocknr); 251de05ca85STheodore Ts'o else 252cc8e94fdSDarrick J. Wong set_buffer_verified(bh); 253cc8e94fdSDarrick J. Wong return error; 254ac27a0ecSDave Kleikamp } 255ac27a0ecSDave Kleikamp 256de05ca85STheodore Ts'o #define ext4_xattr_check_block(inode, bh) \ 257de05ca85STheodore Ts'o __ext4_xattr_check_block((inode), (bh), __func__, __LINE__) 258de05ca85STheodore Ts'o 259de05ca85STheodore Ts'o 2609e92f48cSTheodore Ts'o static int 2619e92f48cSTheodore Ts'o __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, 2629e92f48cSTheodore Ts'o void *end, const char *function, unsigned int line) 2639e92f48cSTheodore Ts'o { 2649e92f48cSTheodore Ts'o int error = -EFSCORRUPTED; 2659e92f48cSTheodore Ts'o 266290ab230SEric Biggers if (end - (void *)header < sizeof(*header) + sizeof(u32) || 26719962509SEric Biggers (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) 2689e92f48cSTheodore Ts'o goto errout; 2692c4f9923SEric Biggers error = ext4_xattr_check_entries(IFIRST(header), end, IFIRST(header)); 2709e92f48cSTheodore Ts'o errout: 2719e92f48cSTheodore Ts'o if (error) 2729e92f48cSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, 2739e92f48cSTheodore Ts'o "corrupted in-inode xattr"); 2749e92f48cSTheodore Ts'o return error; 2759e92f48cSTheodore Ts'o } 2769e92f48cSTheodore Ts'o 2779e92f48cSTheodore Ts'o #define xattr_check_inode(inode, header, end) \ 2789e92f48cSTheodore Ts'o __xattr_check_inode((inode), (header), (end), __func__, __LINE__) 2799e92f48cSTheodore Ts'o 280ac27a0ecSDave Kleikamp static int 2819496005dSTheodore Ts'o xattr_find_entry(struct inode *inode, struct ext4_xattr_entry **pentry, 2829496005dSTheodore Ts'o void *end, int name_index, const char *name, int sorted) 283ac27a0ecSDave Kleikamp { 2849496005dSTheodore Ts'o struct ext4_xattr_entry *entry, *next; 285ac27a0ecSDave Kleikamp size_t name_len; 286ac27a0ecSDave Kleikamp int cmp = 1; 287ac27a0ecSDave Kleikamp 288ac27a0ecSDave Kleikamp if (name == NULL) 289ac27a0ecSDave Kleikamp return -EINVAL; 290ac27a0ecSDave Kleikamp name_len = strlen(name); 2919496005dSTheodore Ts'o for (entry = *pentry; !IS_LAST_ENTRY(entry); entry = next) { 2929496005dSTheodore Ts'o next = EXT4_XATTR_NEXT(entry); 2939496005dSTheodore Ts'o if ((void *) next >= end) { 2949496005dSTheodore Ts'o EXT4_ERROR_INODE(inode, "corrupted xattr entries"); 2959496005dSTheodore Ts'o return -EFSCORRUPTED; 2969496005dSTheodore Ts'o } 297ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 298ac27a0ecSDave Kleikamp if (!cmp) 299ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 300ac27a0ecSDave Kleikamp if (!cmp) 301ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 302ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 303ac27a0ecSDave Kleikamp break; 304ac27a0ecSDave Kleikamp } 305ac27a0ecSDave Kleikamp *pentry = entry; 306ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 307ac27a0ecSDave Kleikamp } 308ac27a0ecSDave Kleikamp 309dec214d0STahsin Erdogan static u32 310dec214d0STahsin Erdogan ext4_xattr_inode_hash(struct ext4_sb_info *sbi, const void *buffer, size_t size) 311dec214d0STahsin Erdogan { 312dec214d0STahsin Erdogan return ext4_chksum(sbi, sbi->s_csum_seed, buffer, size); 313dec214d0STahsin Erdogan } 314dec214d0STahsin Erdogan 315dec214d0STahsin Erdogan static u64 ext4_xattr_inode_get_ref(struct inode *ea_inode) 316dec214d0STahsin Erdogan { 317dec214d0STahsin Erdogan return ((u64)ea_inode->i_ctime.tv_sec << 32) | 318ee73f9a5SJeff Layton (u32) inode_peek_iversion_raw(ea_inode); 319dec214d0STahsin Erdogan } 320dec214d0STahsin Erdogan 321dec214d0STahsin Erdogan static void ext4_xattr_inode_set_ref(struct inode *ea_inode, u64 ref_count) 322dec214d0STahsin Erdogan { 323dec214d0STahsin Erdogan ea_inode->i_ctime.tv_sec = (u32)(ref_count >> 32); 324ee73f9a5SJeff Layton inode_set_iversion_raw(ea_inode, ref_count & 0xffffffff); 325dec214d0STahsin Erdogan } 326dec214d0STahsin Erdogan 327dec214d0STahsin Erdogan static u32 ext4_xattr_inode_get_hash(struct inode *ea_inode) 328dec214d0STahsin Erdogan { 329dec214d0STahsin Erdogan return (u32)ea_inode->i_atime.tv_sec; 330dec214d0STahsin Erdogan } 331dec214d0STahsin Erdogan 332dec214d0STahsin Erdogan static void ext4_xattr_inode_set_hash(struct inode *ea_inode, u32 hash) 333dec214d0STahsin Erdogan { 334dec214d0STahsin Erdogan ea_inode->i_atime.tv_sec = hash; 335dec214d0STahsin Erdogan } 336dec214d0STahsin Erdogan 337e50e5129SAndreas Dilger /* 338e50e5129SAndreas Dilger * Read the EA value from an inode. 339e50e5129SAndreas Dilger */ 34090966693STahsin Erdogan static int ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t size) 341e50e5129SAndreas Dilger { 3429699d4f9STahsin Erdogan int blocksize = 1 << ea_inode->i_blkbits; 3439699d4f9STahsin Erdogan int bh_count = (size + blocksize - 1) >> ea_inode->i_blkbits; 3449699d4f9STahsin Erdogan int tail_size = (size % blocksize) ?: blocksize; 3459699d4f9STahsin Erdogan struct buffer_head *bhs_inline[8]; 3469699d4f9STahsin Erdogan struct buffer_head **bhs = bhs_inline; 3479699d4f9STahsin Erdogan int i, ret; 348e50e5129SAndreas Dilger 3499699d4f9STahsin Erdogan if (bh_count > ARRAY_SIZE(bhs_inline)) { 3509699d4f9STahsin Erdogan bhs = kmalloc_array(bh_count, sizeof(*bhs), GFP_NOFS); 3519699d4f9STahsin Erdogan if (!bhs) 3529699d4f9STahsin Erdogan return -ENOMEM; 353e50e5129SAndreas Dilger } 3549699d4f9STahsin Erdogan 3559699d4f9STahsin Erdogan ret = ext4_bread_batch(ea_inode, 0 /* block */, bh_count, 3569699d4f9STahsin Erdogan true /* wait */, bhs); 3579699d4f9STahsin Erdogan if (ret) 3589699d4f9STahsin Erdogan goto free_bhs; 3599699d4f9STahsin Erdogan 3609699d4f9STahsin Erdogan for (i = 0; i < bh_count; i++) { 3619699d4f9STahsin Erdogan /* There shouldn't be any holes in ea_inode. */ 3629699d4f9STahsin Erdogan if (!bhs[i]) { 3639699d4f9STahsin Erdogan ret = -EFSCORRUPTED; 3649699d4f9STahsin Erdogan goto put_bhs; 3659699d4f9STahsin Erdogan } 3669699d4f9STahsin Erdogan memcpy((char *)buf + blocksize * i, bhs[i]->b_data, 3679699d4f9STahsin Erdogan i < bh_count - 1 ? blocksize : tail_size); 3689699d4f9STahsin Erdogan } 3699699d4f9STahsin Erdogan ret = 0; 3709699d4f9STahsin Erdogan put_bhs: 3719699d4f9STahsin Erdogan for (i = 0; i < bh_count; i++) 3729699d4f9STahsin Erdogan brelse(bhs[i]); 3739699d4f9STahsin Erdogan free_bhs: 3749699d4f9STahsin Erdogan if (bhs != bhs_inline) 3759699d4f9STahsin Erdogan kfree(bhs); 3769699d4f9STahsin Erdogan return ret; 377e50e5129SAndreas Dilger } 378e50e5129SAndreas Dilger 379a6d05676STahsin Erdogan #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec) 380a6d05676STahsin Erdogan 381bab79b04STahsin Erdogan static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, 382a6d05676STahsin Erdogan u32 ea_inode_hash, struct inode **ea_inode) 383e50e5129SAndreas Dilger { 384bab79b04STahsin Erdogan struct inode *inode; 385bab79b04STahsin Erdogan int err; 386e50e5129SAndreas Dilger 3878a363970STheodore Ts'o inode = ext4_iget(parent->i_sb, ea_ino, EXT4_IGET_NORMAL); 388bab79b04STahsin Erdogan if (IS_ERR(inode)) { 389bab79b04STahsin Erdogan err = PTR_ERR(inode); 390dec214d0STahsin Erdogan ext4_error(parent->i_sb, 391dec214d0STahsin Erdogan "error while reading EA inode %lu err=%d", ea_ino, 392dec214d0STahsin Erdogan err); 393bab79b04STahsin Erdogan return err; 394e50e5129SAndreas Dilger } 395e50e5129SAndreas Dilger 396bab79b04STahsin Erdogan if (is_bad_inode(inode)) { 397dec214d0STahsin Erdogan ext4_error(parent->i_sb, 398dec214d0STahsin Erdogan "error while reading EA inode %lu is_bad_inode", 399dec214d0STahsin Erdogan ea_ino); 400bab79b04STahsin Erdogan err = -EIO; 401e50e5129SAndreas Dilger goto error; 402e50e5129SAndreas Dilger } 403e50e5129SAndreas Dilger 404bab79b04STahsin Erdogan if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) { 405dec214d0STahsin Erdogan ext4_error(parent->i_sb, 406dec214d0STahsin Erdogan "EA inode %lu does not have EXT4_EA_INODE_FL flag", 407dec214d0STahsin Erdogan ea_ino); 408bab79b04STahsin Erdogan err = -EINVAL; 409e50e5129SAndreas Dilger goto error; 410e50e5129SAndreas Dilger } 411e50e5129SAndreas Dilger 412a6d05676STahsin Erdogan ext4_xattr_inode_set_class(inode); 413a6d05676STahsin Erdogan 414a6d05676STahsin Erdogan /* 415a6d05676STahsin Erdogan * Check whether this is an old Lustre-style xattr inode. Lustre 416a6d05676STahsin Erdogan * implementation does not have hash validation, rather it has a 417a6d05676STahsin Erdogan * backpointer from ea_inode to the parent inode. 418a6d05676STahsin Erdogan */ 419a6d05676STahsin Erdogan if (ea_inode_hash != ext4_xattr_inode_get_hash(inode) && 420a6d05676STahsin Erdogan EXT4_XATTR_INODE_GET_PARENT(inode) == parent->i_ino && 421a6d05676STahsin Erdogan inode->i_generation == parent->i_generation) { 422a6d05676STahsin Erdogan ext4_set_inode_state(inode, EXT4_STATE_LUSTRE_EA_INODE); 423a6d05676STahsin Erdogan ext4_xattr_inode_set_ref(inode, 1); 424a6d05676STahsin Erdogan } else { 425a6d05676STahsin Erdogan inode_lock(inode); 426a6d05676STahsin Erdogan inode->i_flags |= S_NOQUOTA; 427a6d05676STahsin Erdogan inode_unlock(inode); 428a6d05676STahsin Erdogan } 429a6d05676STahsin Erdogan 430bab79b04STahsin Erdogan *ea_inode = inode; 431bab79b04STahsin Erdogan return 0; 432e50e5129SAndreas Dilger error: 433bab79b04STahsin Erdogan iput(inode); 434bab79b04STahsin Erdogan return err; 435e50e5129SAndreas Dilger } 436e50e5129SAndreas Dilger 437dec214d0STahsin Erdogan static int 438b9fc761eSTahsin Erdogan ext4_xattr_inode_verify_hashes(struct inode *ea_inode, 439b9fc761eSTahsin Erdogan struct ext4_xattr_entry *entry, void *buffer, 440b9fc761eSTahsin Erdogan size_t size) 441dec214d0STahsin Erdogan { 442dec214d0STahsin Erdogan u32 hash; 443dec214d0STahsin Erdogan 444dec214d0STahsin Erdogan /* Verify stored hash matches calculated hash. */ 445dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); 446dec214d0STahsin Erdogan if (hash != ext4_xattr_inode_get_hash(ea_inode)) 447dec214d0STahsin Erdogan return -EFSCORRUPTED; 448b9fc761eSTahsin Erdogan 449b9fc761eSTahsin Erdogan if (entry) { 450b9fc761eSTahsin Erdogan __le32 e_hash, tmp_data; 451b9fc761eSTahsin Erdogan 452b9fc761eSTahsin Erdogan /* Verify entry hash. */ 453b9fc761eSTahsin Erdogan tmp_data = cpu_to_le32(hash); 454b9fc761eSTahsin Erdogan e_hash = ext4_xattr_hash_entry(entry->e_name, entry->e_name_len, 455b9fc761eSTahsin Erdogan &tmp_data, 1); 456b9fc761eSTahsin Erdogan if (e_hash != entry->e_hash) 457b9fc761eSTahsin Erdogan return -EFSCORRUPTED; 458b9fc761eSTahsin Erdogan } 459dec214d0STahsin Erdogan return 0; 460dec214d0STahsin Erdogan } 461dec214d0STahsin Erdogan 462e50e5129SAndreas Dilger /* 463b9fc761eSTahsin Erdogan * Read xattr value from the EA inode. 464e50e5129SAndreas Dilger */ 465e50e5129SAndreas Dilger static int 466b9fc761eSTahsin Erdogan ext4_xattr_inode_get(struct inode *inode, struct ext4_xattr_entry *entry, 467b9fc761eSTahsin Erdogan void *buffer, size_t size) 468e50e5129SAndreas Dilger { 469dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 470bab79b04STahsin Erdogan struct inode *ea_inode; 471dec214d0STahsin Erdogan int err; 472e50e5129SAndreas Dilger 473b9fc761eSTahsin Erdogan err = ext4_xattr_inode_iget(inode, le32_to_cpu(entry->e_value_inum), 474a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), &ea_inode); 475dec214d0STahsin Erdogan if (err) { 476dec214d0STahsin Erdogan ea_inode = NULL; 477dec214d0STahsin Erdogan goto out; 478dec214d0STahsin Erdogan } 479e50e5129SAndreas Dilger 480dec214d0STahsin Erdogan if (i_size_read(ea_inode) != size) { 481dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 482dec214d0STahsin Erdogan "ea_inode file size=%llu entry size=%zu", 483dec214d0STahsin Erdogan i_size_read(ea_inode), size); 484dec214d0STahsin Erdogan err = -EFSCORRUPTED; 485dec214d0STahsin Erdogan goto out; 486dec214d0STahsin Erdogan } 487dec214d0STahsin Erdogan 488dec214d0STahsin Erdogan err = ext4_xattr_inode_read(ea_inode, buffer, size); 489dec214d0STahsin Erdogan if (err) 490dec214d0STahsin Erdogan goto out; 491dec214d0STahsin Erdogan 492a6d05676STahsin Erdogan if (!ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) { 493a6d05676STahsin Erdogan err = ext4_xattr_inode_verify_hashes(ea_inode, entry, buffer, 494a6d05676STahsin Erdogan size); 495a6d05676STahsin Erdogan if (err) { 496dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 497dec214d0STahsin Erdogan "EA inode hash validation failed"); 498dec214d0STahsin Erdogan goto out; 499dec214d0STahsin Erdogan } 500dec214d0STahsin Erdogan 501dec214d0STahsin Erdogan if (ea_inode_cache) 502dec214d0STahsin Erdogan mb_cache_entry_create(ea_inode_cache, GFP_NOFS, 503dec214d0STahsin Erdogan ext4_xattr_inode_get_hash(ea_inode), 504dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 505a6d05676STahsin Erdogan } 506dec214d0STahsin Erdogan out: 507e50e5129SAndreas Dilger iput(ea_inode); 508dec214d0STahsin Erdogan return err; 509e50e5129SAndreas Dilger } 510e50e5129SAndreas Dilger 511ac27a0ecSDave Kleikamp static int 512617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 513ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 514ac27a0ecSDave Kleikamp { 515ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 516617ba13bSMingming Cao struct ext4_xattr_entry *entry; 517ac27a0ecSDave Kleikamp size_t size; 5189496005dSTheodore Ts'o void *end; 519ac27a0ecSDave Kleikamp int error; 52047387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 521ac27a0ecSDave Kleikamp 522ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 523ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 524ac27a0ecSDave Kleikamp 525617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 526fb265c9cSTheodore Ts'o return -ENODATA; 527ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 528ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 529fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 530fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 531fb265c9cSTheodore Ts'o return PTR_ERR(bh); 532ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 533ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 534de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 535de05ca85STheodore Ts'o if (error) 536ac27a0ecSDave Kleikamp goto cleanup; 53747387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bh); 538ac27a0ecSDave Kleikamp entry = BFIRST(bh); 5399496005dSTheodore Ts'o end = bh->b_data + bh->b_size; 5409496005dSTheodore Ts'o error = xattr_find_entry(inode, &entry, end, name_index, name, 1); 541ac27a0ecSDave Kleikamp if (error) 542ac27a0ecSDave Kleikamp goto cleanup; 543ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 544ac27a0ecSDave Kleikamp error = -ERANGE; 54554dd0e0aSTheodore Ts'o if (unlikely(size > EXT4_XATTR_SIZE_MAX)) 54654dd0e0aSTheodore Ts'o goto cleanup; 54754dd0e0aSTheodore Ts'o if (buffer) { 548ac27a0ecSDave Kleikamp if (size > buffer_size) 549ac27a0ecSDave Kleikamp goto cleanup; 550e50e5129SAndreas Dilger if (entry->e_value_inum) { 551b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 552b9fc761eSTahsin Erdogan size); 553e50e5129SAndreas Dilger if (error) 554e50e5129SAndreas Dilger goto cleanup; 555e50e5129SAndreas Dilger } else { 55654dd0e0aSTheodore Ts'o u16 offset = le16_to_cpu(entry->e_value_offs); 55754dd0e0aSTheodore Ts'o void *p = bh->b_data + offset; 55854dd0e0aSTheodore Ts'o 55954dd0e0aSTheodore Ts'o if (unlikely(p + size > end)) 56054dd0e0aSTheodore Ts'o goto cleanup; 56154dd0e0aSTheodore Ts'o memcpy(buffer, p, size); 562e50e5129SAndreas Dilger } 563ac27a0ecSDave Kleikamp } 564ac27a0ecSDave Kleikamp error = size; 565ac27a0ecSDave Kleikamp 566ac27a0ecSDave Kleikamp cleanup: 567ac27a0ecSDave Kleikamp brelse(bh); 568ac27a0ecSDave Kleikamp return error; 569ac27a0ecSDave Kleikamp } 570ac27a0ecSDave Kleikamp 571879b3825STao Ma int 572617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 573ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 574ac27a0ecSDave Kleikamp { 575617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 576617ba13bSMingming Cao struct ext4_xattr_entry *entry; 577617ba13bSMingming Cao struct ext4_inode *raw_inode; 578617ba13bSMingming Cao struct ext4_iloc iloc; 579ac27a0ecSDave Kleikamp size_t size; 580ac27a0ecSDave Kleikamp void *end; 581ac27a0ecSDave Kleikamp int error; 582ac27a0ecSDave Kleikamp 58319f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 584ac27a0ecSDave Kleikamp return -ENODATA; 585617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 586ac27a0ecSDave Kleikamp if (error) 587ac27a0ecSDave Kleikamp return error; 588617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 589ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 590617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 5919e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 592ac27a0ecSDave Kleikamp if (error) 593ac27a0ecSDave Kleikamp goto cleanup; 5946ba644b9SEric Biggers entry = IFIRST(header); 5959496005dSTheodore Ts'o error = xattr_find_entry(inode, &entry, end, name_index, name, 0); 596ac27a0ecSDave Kleikamp if (error) 597ac27a0ecSDave Kleikamp goto cleanup; 598ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 599ac27a0ecSDave Kleikamp error = -ERANGE; 60054dd0e0aSTheodore Ts'o if (unlikely(size > EXT4_XATTR_SIZE_MAX)) 60154dd0e0aSTheodore Ts'o goto cleanup; 60254dd0e0aSTheodore Ts'o if (buffer) { 603ac27a0ecSDave Kleikamp if (size > buffer_size) 604ac27a0ecSDave Kleikamp goto cleanup; 605e50e5129SAndreas Dilger if (entry->e_value_inum) { 606b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 607b9fc761eSTahsin Erdogan size); 608e50e5129SAndreas Dilger if (error) 609e50e5129SAndreas Dilger goto cleanup; 610e50e5129SAndreas Dilger } else { 61154dd0e0aSTheodore Ts'o u16 offset = le16_to_cpu(entry->e_value_offs); 61254dd0e0aSTheodore Ts'o void *p = (void *)IFIRST(header) + offset; 61354dd0e0aSTheodore Ts'o 61454dd0e0aSTheodore Ts'o if (unlikely(p + size > end)) 61554dd0e0aSTheodore Ts'o goto cleanup; 61654dd0e0aSTheodore Ts'o memcpy(buffer, p, size); 617ac27a0ecSDave Kleikamp } 618e50e5129SAndreas Dilger } 619ac27a0ecSDave Kleikamp error = size; 620ac27a0ecSDave Kleikamp 621ac27a0ecSDave Kleikamp cleanup: 622ac27a0ecSDave Kleikamp brelse(iloc.bh); 623ac27a0ecSDave Kleikamp return error; 624ac27a0ecSDave Kleikamp } 625ac27a0ecSDave Kleikamp 626ac27a0ecSDave Kleikamp /* 627617ba13bSMingming Cao * ext4_xattr_get() 628ac27a0ecSDave Kleikamp * 629ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 630ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 631ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 632ac27a0ecSDave Kleikamp * 633ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 634ac27a0ecSDave Kleikamp * used / required on success. 635ac27a0ecSDave Kleikamp */ 636ac27a0ecSDave Kleikamp int 637617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 638ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 639ac27a0ecSDave Kleikamp { 640ac27a0ecSDave Kleikamp int error; 641ac27a0ecSDave Kleikamp 6420db1ff22STheodore Ts'o if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 6430db1ff22STheodore Ts'o return -EIO; 6440db1ff22STheodore Ts'o 645230b8c1aSZhang Zhen if (strlen(name) > 255) 646230b8c1aSZhang Zhen return -ERANGE; 647230b8c1aSZhang Zhen 648617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 649617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 650ac27a0ecSDave Kleikamp buffer_size); 651ac27a0ecSDave Kleikamp if (error == -ENODATA) 652617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 653ac27a0ecSDave Kleikamp buffer_size); 654617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 655ac27a0ecSDave Kleikamp return error; 656ac27a0ecSDave Kleikamp } 657ac27a0ecSDave Kleikamp 658ac27a0ecSDave Kleikamp static int 659431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 660ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 661ac27a0ecSDave Kleikamp { 662ac27a0ecSDave Kleikamp size_t rest = buffer_size; 663ac27a0ecSDave Kleikamp 664617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 66511e27528SStephen Hemminger const struct xattr_handler *handler = 666617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 667ac27a0ecSDave Kleikamp 668764a5c6bSAndreas Gruenbacher if (handler && (!handler->list || handler->list(dentry))) { 669764a5c6bSAndreas Gruenbacher const char *prefix = handler->prefix ?: handler->name; 670764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 671764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 672764a5c6bSAndreas Gruenbacher 673ac27a0ecSDave Kleikamp if (buffer) { 674ac27a0ecSDave Kleikamp if (size > rest) 675ac27a0ecSDave Kleikamp return -ERANGE; 676764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 677764a5c6bSAndreas Gruenbacher buffer += prefix_len; 678764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 679764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 680764a5c6bSAndreas Gruenbacher *buffer++ = 0; 681ac27a0ecSDave Kleikamp } 682ac27a0ecSDave Kleikamp rest -= size; 683ac27a0ecSDave Kleikamp } 684ac27a0ecSDave Kleikamp } 685764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 686ac27a0ecSDave Kleikamp } 687ac27a0ecSDave Kleikamp 688ac27a0ecSDave Kleikamp static int 689431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 690ac27a0ecSDave Kleikamp { 6912b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 692ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 693ac27a0ecSDave Kleikamp int error; 694ac27a0ecSDave Kleikamp 695ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 696ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 697ac27a0ecSDave Kleikamp 698617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 699fb265c9cSTheodore Ts'o return 0; 700ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 701ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 702fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 703fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 704fb265c9cSTheodore Ts'o return PTR_ERR(bh); 705ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 706ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 707de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 708de05ca85STheodore Ts'o if (error) 709ac27a0ecSDave Kleikamp goto cleanup; 71047387409STahsin Erdogan ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); 711fb265c9cSTheodore Ts'o error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, 712fb265c9cSTheodore Ts'o buffer_size); 713ac27a0ecSDave Kleikamp cleanup: 714ac27a0ecSDave Kleikamp brelse(bh); 715ac27a0ecSDave Kleikamp return error; 716ac27a0ecSDave Kleikamp } 717ac27a0ecSDave Kleikamp 718ac27a0ecSDave Kleikamp static int 719431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 720ac27a0ecSDave Kleikamp { 7212b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 722617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 723617ba13bSMingming Cao struct ext4_inode *raw_inode; 724617ba13bSMingming Cao struct ext4_iloc iloc; 725ac27a0ecSDave Kleikamp void *end; 726ac27a0ecSDave Kleikamp int error; 727ac27a0ecSDave Kleikamp 72819f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 729ac27a0ecSDave Kleikamp return 0; 730617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 731ac27a0ecSDave Kleikamp if (error) 732ac27a0ecSDave Kleikamp return error; 733617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 734ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 735617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 7369e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 737ac27a0ecSDave Kleikamp if (error) 738ac27a0ecSDave Kleikamp goto cleanup; 739431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 740ac27a0ecSDave Kleikamp buffer, buffer_size); 741ac27a0ecSDave Kleikamp 742ac27a0ecSDave Kleikamp cleanup: 743ac27a0ecSDave Kleikamp brelse(iloc.bh); 744ac27a0ecSDave Kleikamp return error; 745ac27a0ecSDave Kleikamp } 746ac27a0ecSDave Kleikamp 747ac27a0ecSDave Kleikamp /* 748ba7ea1d8SEric Biggers * Inode operation listxattr() 749ba7ea1d8SEric Biggers * 750ba7ea1d8SEric Biggers * d_inode(dentry)->i_rwsem: don't care 751ac27a0ecSDave Kleikamp * 752ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 753ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 754ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 755ac27a0ecSDave Kleikamp * 756ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 757ac27a0ecSDave Kleikamp * used / required on success. 758ac27a0ecSDave Kleikamp */ 759ba7ea1d8SEric Biggers ssize_t 760ba7ea1d8SEric Biggers ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) 761ac27a0ecSDave Kleikamp { 762eaeef867STheodore Ts'o int ret, ret2; 763ac27a0ecSDave Kleikamp 7642b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 765eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 766eaeef867STheodore Ts'o if (ret < 0) 767eaeef867STheodore Ts'o goto errout; 768ac27a0ecSDave Kleikamp if (buffer) { 769eaeef867STheodore Ts'o buffer += ret; 770eaeef867STheodore Ts'o buffer_size -= ret; 771ac27a0ecSDave Kleikamp } 772eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 773eaeef867STheodore Ts'o if (ret < 0) 774eaeef867STheodore Ts'o goto errout; 775eaeef867STheodore Ts'o ret += ret2; 776eaeef867STheodore Ts'o errout: 7772b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 778eaeef867STheodore Ts'o return ret; 779ac27a0ecSDave Kleikamp } 780ac27a0ecSDave Kleikamp 781ac27a0ecSDave Kleikamp /* 782617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 783ac27a0ecSDave Kleikamp * not set, set it. 784ac27a0ecSDave Kleikamp */ 785617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 786ac27a0ecSDave Kleikamp struct super_block *sb) 787ac27a0ecSDave Kleikamp { 788e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 789ac27a0ecSDave Kleikamp return; 790ac27a0ecSDave Kleikamp 7915d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 792617ba13bSMingming Cao if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { 793e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 794a0375156STheodore Ts'o ext4_handle_dirty_super(handle, sb); 795ac27a0ecSDave Kleikamp } 796ac27a0ecSDave Kleikamp } 797ac27a0ecSDave Kleikamp 7987a9ca53aSTahsin Erdogan int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) 7997a9ca53aSTahsin Erdogan { 8007a9ca53aSTahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 8017a9ca53aSTahsin Erdogan struct buffer_head *bh = NULL; 8027a9ca53aSTahsin Erdogan struct ext4_inode *raw_inode; 8037a9ca53aSTahsin Erdogan struct ext4_xattr_ibody_header *header; 8047a9ca53aSTahsin Erdogan struct ext4_xattr_entry *entry; 8057a9ca53aSTahsin Erdogan qsize_t ea_inode_refs = 0; 8067a9ca53aSTahsin Erdogan void *end; 8077a9ca53aSTahsin Erdogan int ret; 8087a9ca53aSTahsin Erdogan 8097a9ca53aSTahsin Erdogan lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); 8107a9ca53aSTahsin Erdogan 8117a9ca53aSTahsin Erdogan if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 8127a9ca53aSTahsin Erdogan ret = ext4_get_inode_loc(inode, &iloc); 8137a9ca53aSTahsin Erdogan if (ret) 8147a9ca53aSTahsin Erdogan goto out; 8157a9ca53aSTahsin Erdogan raw_inode = ext4_raw_inode(&iloc); 8167a9ca53aSTahsin Erdogan header = IHDR(inode, raw_inode); 8177a9ca53aSTahsin Erdogan end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 8187a9ca53aSTahsin Erdogan ret = xattr_check_inode(inode, header, end); 8197a9ca53aSTahsin Erdogan if (ret) 8207a9ca53aSTahsin Erdogan goto out; 8217a9ca53aSTahsin Erdogan 8227a9ca53aSTahsin Erdogan for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); 8237a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 8247a9ca53aSTahsin Erdogan if (entry->e_value_inum) 8257a9ca53aSTahsin Erdogan ea_inode_refs++; 8267a9ca53aSTahsin Erdogan } 8277a9ca53aSTahsin Erdogan 8287a9ca53aSTahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 829fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 830fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 831fb265c9cSTheodore Ts'o ret = PTR_ERR(bh); 8327159a986SDan Carpenter bh = NULL; 8337a9ca53aSTahsin Erdogan goto out; 8347a9ca53aSTahsin Erdogan } 8357a9ca53aSTahsin Erdogan 836de05ca85STheodore Ts'o ret = ext4_xattr_check_block(inode, bh); 837de05ca85STheodore Ts'o if (ret) 8387a9ca53aSTahsin Erdogan goto out; 8397a9ca53aSTahsin Erdogan 8407a9ca53aSTahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 8417a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 8427a9ca53aSTahsin Erdogan if (entry->e_value_inum) 8437a9ca53aSTahsin Erdogan ea_inode_refs++; 8447a9ca53aSTahsin Erdogan } 8457a9ca53aSTahsin Erdogan *usage = ea_inode_refs + 1; 8467a9ca53aSTahsin Erdogan ret = 0; 8477a9ca53aSTahsin Erdogan out: 8487a9ca53aSTahsin Erdogan brelse(iloc.bh); 8497a9ca53aSTahsin Erdogan brelse(bh); 8507a9ca53aSTahsin Erdogan return ret; 8517a9ca53aSTahsin Erdogan } 8527a9ca53aSTahsin Erdogan 853dec214d0STahsin Erdogan static inline size_t round_up_cluster(struct inode *inode, size_t length) 854dec214d0STahsin Erdogan { 855dec214d0STahsin Erdogan struct super_block *sb = inode->i_sb; 856dec214d0STahsin Erdogan size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + 857dec214d0STahsin Erdogan inode->i_blkbits); 858dec214d0STahsin Erdogan size_t mask = ~(cluster_size - 1); 859dec214d0STahsin Erdogan 860dec214d0STahsin Erdogan return (length + cluster_size - 1) & mask; 861dec214d0STahsin Erdogan } 862dec214d0STahsin Erdogan 863dec214d0STahsin Erdogan static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) 864dec214d0STahsin Erdogan { 865dec214d0STahsin Erdogan int err; 866dec214d0STahsin Erdogan 867dec214d0STahsin Erdogan err = dquot_alloc_inode(inode); 868dec214d0STahsin Erdogan if (err) 869dec214d0STahsin Erdogan return err; 870dec214d0STahsin Erdogan err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); 871dec214d0STahsin Erdogan if (err) 872dec214d0STahsin Erdogan dquot_free_inode(inode); 873dec214d0STahsin Erdogan return err; 874dec214d0STahsin Erdogan } 875dec214d0STahsin Erdogan 876a6d05676STahsin Erdogan static void ext4_xattr_inode_free_quota(struct inode *parent, 877a6d05676STahsin Erdogan struct inode *ea_inode, 878a6d05676STahsin Erdogan size_t len) 879dec214d0STahsin Erdogan { 880a6d05676STahsin Erdogan if (ea_inode && 881a6d05676STahsin Erdogan ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) 882a6d05676STahsin Erdogan return; 883a6d05676STahsin Erdogan dquot_free_space_nodirty(parent, round_up_cluster(parent, len)); 884a6d05676STahsin Erdogan dquot_free_inode(parent); 885dec214d0STahsin Erdogan } 886dec214d0STahsin Erdogan 887af65207cSTahsin Erdogan int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode, 888af65207cSTahsin Erdogan struct buffer_head *block_bh, size_t value_len, 889af65207cSTahsin Erdogan bool is_create) 890dec214d0STahsin Erdogan { 891dec214d0STahsin Erdogan int credits; 892dec214d0STahsin Erdogan int blocks; 893dec214d0STahsin Erdogan 894dec214d0STahsin Erdogan /* 895dec214d0STahsin Erdogan * 1) Owner inode update 896dec214d0STahsin Erdogan * 2) Ref count update on old xattr block 897dec214d0STahsin Erdogan * 3) new xattr block 898dec214d0STahsin Erdogan * 4) block bitmap update for new xattr block 899dec214d0STahsin Erdogan * 5) group descriptor for new xattr block 900dec214d0STahsin Erdogan * 6) block bitmap update for old xattr block 901dec214d0STahsin Erdogan * 7) group descriptor for old block 902dec214d0STahsin Erdogan * 903dec214d0STahsin Erdogan * 6 & 7 can happen if we have two racing threads T_a and T_b 904dec214d0STahsin Erdogan * which are each trying to set an xattr on inodes I_a and I_b 905dec214d0STahsin Erdogan * which were both initially sharing an xattr block. 906dec214d0STahsin Erdogan */ 907dec214d0STahsin Erdogan credits = 7; 908dec214d0STahsin Erdogan 909dec214d0STahsin Erdogan /* Quota updates. */ 910dec214d0STahsin Erdogan credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); 911dec214d0STahsin Erdogan 912dec214d0STahsin Erdogan /* 913dec214d0STahsin Erdogan * In case of inline data, we may push out the data to a block, 914dec214d0STahsin Erdogan * so we need to reserve credits for this eventuality 915dec214d0STahsin Erdogan */ 916af65207cSTahsin Erdogan if (inode && ext4_has_inline_data(inode)) 917dec214d0STahsin Erdogan credits += ext4_writepage_trans_blocks(inode) + 1; 918dec214d0STahsin Erdogan 919dec214d0STahsin Erdogan /* We are done if ea_inode feature is not enabled. */ 920dec214d0STahsin Erdogan if (!ext4_has_feature_ea_inode(sb)) 921dec214d0STahsin Erdogan return credits; 922dec214d0STahsin Erdogan 923dec214d0STahsin Erdogan /* New ea_inode, inode map, block bitmap, group descriptor. */ 924dec214d0STahsin Erdogan credits += 4; 925dec214d0STahsin Erdogan 926dec214d0STahsin Erdogan /* Data blocks. */ 927dec214d0STahsin Erdogan blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 928dec214d0STahsin Erdogan 929dec214d0STahsin Erdogan /* Indirection block or one level of extent tree. */ 930dec214d0STahsin Erdogan blocks += 1; 931dec214d0STahsin Erdogan 932dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 933dec214d0STahsin Erdogan credits += blocks * 2; 934dec214d0STahsin Erdogan 935dec214d0STahsin Erdogan /* Blocks themselves. */ 936dec214d0STahsin Erdogan credits += blocks; 937dec214d0STahsin Erdogan 938af65207cSTahsin Erdogan if (!is_create) { 939dec214d0STahsin Erdogan /* Dereference ea_inode holding old xattr value. 940dec214d0STahsin Erdogan * Old ea_inode, inode map, block bitmap, group descriptor. 941dec214d0STahsin Erdogan */ 942dec214d0STahsin Erdogan credits += 4; 943dec214d0STahsin Erdogan 944dec214d0STahsin Erdogan /* Data blocks for old ea_inode. */ 945dec214d0STahsin Erdogan blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; 946dec214d0STahsin Erdogan 947af65207cSTahsin Erdogan /* Indirection block or one level of extent tree for old 948af65207cSTahsin Erdogan * ea_inode. 949af65207cSTahsin Erdogan */ 950dec214d0STahsin Erdogan blocks += 1; 951dec214d0STahsin Erdogan 952dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 953dec214d0STahsin Erdogan credits += blocks * 2; 954af65207cSTahsin Erdogan } 955dec214d0STahsin Erdogan 956dec214d0STahsin Erdogan /* We may need to clone the existing xattr block in which case we need 957dec214d0STahsin Erdogan * to increment ref counts for existing ea_inodes referenced by it. 958dec214d0STahsin Erdogan */ 959dec214d0STahsin Erdogan if (block_bh) { 960dec214d0STahsin Erdogan struct ext4_xattr_entry *entry = BFIRST(block_bh); 961dec214d0STahsin Erdogan 962dec214d0STahsin Erdogan for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) 963dec214d0STahsin Erdogan if (entry->e_value_inum) 964dec214d0STahsin Erdogan /* Ref count update on ea_inode. */ 965dec214d0STahsin Erdogan credits += 1; 966dec214d0STahsin Erdogan } 967dec214d0STahsin Erdogan return credits; 968dec214d0STahsin Erdogan } 969dec214d0STahsin Erdogan 970dec214d0STahsin Erdogan static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, 971dec214d0STahsin Erdogan int ref_change) 972dec214d0STahsin Erdogan { 973dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(ea_inode); 974dec214d0STahsin Erdogan struct ext4_iloc iloc; 975dec214d0STahsin Erdogan s64 ref_count; 976dec214d0STahsin Erdogan u32 hash; 977dec214d0STahsin Erdogan int ret; 978dec214d0STahsin Erdogan 979dec214d0STahsin Erdogan inode_lock(ea_inode); 980dec214d0STahsin Erdogan 981dec214d0STahsin Erdogan ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); 9821bfc204dSVasily Averin if (ret) 983dec214d0STahsin Erdogan goto out; 984dec214d0STahsin Erdogan 985dec214d0STahsin Erdogan ref_count = ext4_xattr_inode_get_ref(ea_inode); 986dec214d0STahsin Erdogan ref_count += ref_change; 987dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, ref_count); 988dec214d0STahsin Erdogan 989dec214d0STahsin Erdogan if (ref_change > 0) { 990dec214d0STahsin Erdogan WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", 991dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 992dec214d0STahsin Erdogan 993dec214d0STahsin Erdogan if (ref_count == 1) { 994dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", 995dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 996dec214d0STahsin Erdogan 997dec214d0STahsin Erdogan set_nlink(ea_inode, 1); 998dec214d0STahsin Erdogan ext4_orphan_del(handle, ea_inode); 999dec214d0STahsin Erdogan 1000cdb7ee4cSTahsin Erdogan if (ea_inode_cache) { 1001dec214d0STahsin Erdogan hash = ext4_xattr_inode_get_hash(ea_inode); 1002cdb7ee4cSTahsin Erdogan mb_cache_entry_create(ea_inode_cache, 1003cdb7ee4cSTahsin Erdogan GFP_NOFS, hash, 1004dec214d0STahsin Erdogan ea_inode->i_ino, 1005dec214d0STahsin Erdogan true /* reusable */); 1006dec214d0STahsin Erdogan } 1007cdb7ee4cSTahsin Erdogan } 1008dec214d0STahsin Erdogan } else { 1009dec214d0STahsin Erdogan WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", 1010dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1011dec214d0STahsin Erdogan 1012dec214d0STahsin Erdogan if (ref_count == 0) { 1013dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink != 1, 1014dec214d0STahsin Erdogan "EA inode %lu i_nlink=%u", 1015dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1016dec214d0STahsin Erdogan 1017dec214d0STahsin Erdogan clear_nlink(ea_inode); 1018dec214d0STahsin Erdogan ext4_orphan_add(handle, ea_inode); 1019dec214d0STahsin Erdogan 1020cdb7ee4cSTahsin Erdogan if (ea_inode_cache) { 1021dec214d0STahsin Erdogan hash = ext4_xattr_inode_get_hash(ea_inode); 1022dec214d0STahsin Erdogan mb_cache_entry_delete(ea_inode_cache, hash, 1023dec214d0STahsin Erdogan ea_inode->i_ino); 1024dec214d0STahsin Erdogan } 1025dec214d0STahsin Erdogan } 1026cdb7ee4cSTahsin Erdogan } 1027dec214d0STahsin Erdogan 1028dec214d0STahsin Erdogan ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); 1029dec214d0STahsin Erdogan if (ret) 1030dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 1031dec214d0STahsin Erdogan "ext4_mark_iloc_dirty() failed ret=%d", ret); 1032dec214d0STahsin Erdogan out: 1033dec214d0STahsin Erdogan inode_unlock(ea_inode); 1034dec214d0STahsin Erdogan return ret; 1035dec214d0STahsin Erdogan } 1036dec214d0STahsin Erdogan 1037dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) 1038dec214d0STahsin Erdogan { 1039dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, 1); 1040dec214d0STahsin Erdogan } 1041dec214d0STahsin Erdogan 1042dec214d0STahsin Erdogan static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) 1043dec214d0STahsin Erdogan { 1044dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, -1); 1045dec214d0STahsin Erdogan } 1046dec214d0STahsin Erdogan 1047dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, 1048dec214d0STahsin Erdogan struct ext4_xattr_entry *first) 1049dec214d0STahsin Erdogan { 1050dec214d0STahsin Erdogan struct inode *ea_inode; 1051dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 1052dec214d0STahsin Erdogan struct ext4_xattr_entry *failed_entry; 1053dec214d0STahsin Erdogan unsigned int ea_ino; 1054dec214d0STahsin Erdogan int err, saved_err; 1055dec214d0STahsin Erdogan 1056dec214d0STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 1057dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1058dec214d0STahsin Erdogan if (!entry->e_value_inum) 1059dec214d0STahsin Erdogan continue; 1060dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1061a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1062a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1063a6d05676STahsin Erdogan &ea_inode); 1064dec214d0STahsin Erdogan if (err) 1065dec214d0STahsin Erdogan goto cleanup; 1066dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1067dec214d0STahsin Erdogan if (err) { 1068dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "inc ref error %d", err); 1069dec214d0STahsin Erdogan iput(ea_inode); 1070dec214d0STahsin Erdogan goto cleanup; 1071dec214d0STahsin Erdogan } 1072dec214d0STahsin Erdogan iput(ea_inode); 1073dec214d0STahsin Erdogan } 1074dec214d0STahsin Erdogan return 0; 1075dec214d0STahsin Erdogan 1076dec214d0STahsin Erdogan cleanup: 1077dec214d0STahsin Erdogan saved_err = err; 1078dec214d0STahsin Erdogan failed_entry = entry; 1079dec214d0STahsin Erdogan 1080dec214d0STahsin Erdogan for (entry = first; entry != failed_entry; 1081dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1082dec214d0STahsin Erdogan if (!entry->e_value_inum) 1083dec214d0STahsin Erdogan continue; 1084dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1085a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1086a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1087a6d05676STahsin Erdogan &ea_inode); 1088dec214d0STahsin Erdogan if (err) { 1089dec214d0STahsin Erdogan ext4_warning(parent->i_sb, 1090dec214d0STahsin Erdogan "cleanup ea_ino %u iget error %d", ea_ino, 1091dec214d0STahsin Erdogan err); 1092dec214d0STahsin Erdogan continue; 1093dec214d0STahsin Erdogan } 1094dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1095dec214d0STahsin Erdogan if (err) 1096dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "cleanup dec ref error %d", 1097dec214d0STahsin Erdogan err); 1098dec214d0STahsin Erdogan iput(ea_inode); 1099dec214d0STahsin Erdogan } 1100dec214d0STahsin Erdogan return saved_err; 1101dec214d0STahsin Erdogan } 1102dec214d0STahsin Erdogan 1103a4130367SJan Kara static int ext4_xattr_restart_fn(handle_t *handle, struct inode *inode, 1104a4130367SJan Kara struct buffer_head *bh, bool block_csum, bool dirty) 1105a4130367SJan Kara { 1106a4130367SJan Kara int error; 1107a4130367SJan Kara 1108a4130367SJan Kara if (bh && dirty) { 1109a4130367SJan Kara if (block_csum) 1110a4130367SJan Kara ext4_xattr_block_csum_set(inode, bh); 1111a4130367SJan Kara error = ext4_handle_dirty_metadata(handle, NULL, bh); 1112a4130367SJan Kara if (error) { 1113a4130367SJan Kara ext4_warning(inode->i_sb, "Handle metadata (error %d)", 1114a4130367SJan Kara error); 1115a4130367SJan Kara return error; 1116a4130367SJan Kara } 1117a4130367SJan Kara } 1118a4130367SJan Kara return 0; 1119a4130367SJan Kara } 1120a4130367SJan Kara 112130a7eb97STahsin Erdogan static void 1122dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, 112330a7eb97STahsin Erdogan struct buffer_head *bh, 112430a7eb97STahsin Erdogan struct ext4_xattr_entry *first, bool block_csum, 112530a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1126dec214d0STahsin Erdogan int extra_credits, bool skip_quota) 112730a7eb97STahsin Erdogan { 112830a7eb97STahsin Erdogan struct inode *ea_inode; 112930a7eb97STahsin Erdogan struct ext4_xattr_entry *entry; 113030a7eb97STahsin Erdogan bool dirty = false; 113130a7eb97STahsin Erdogan unsigned int ea_ino; 113230a7eb97STahsin Erdogan int err; 113330a7eb97STahsin Erdogan int credits; 113430a7eb97STahsin Erdogan 113530a7eb97STahsin Erdogan /* One credit for dec ref on ea_inode, one for orphan list addition, */ 113630a7eb97STahsin Erdogan credits = 2 + extra_credits; 113730a7eb97STahsin Erdogan 113830a7eb97STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 113930a7eb97STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 114030a7eb97STahsin Erdogan if (!entry->e_value_inum) 114130a7eb97STahsin Erdogan continue; 114230a7eb97STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1143a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1144a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1145a6d05676STahsin Erdogan &ea_inode); 114630a7eb97STahsin Erdogan if (err) 114730a7eb97STahsin Erdogan continue; 114830a7eb97STahsin Erdogan 114930a7eb97STahsin Erdogan err = ext4_expand_inode_array(ea_inode_array, ea_inode); 115030a7eb97STahsin Erdogan if (err) { 115130a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, 115230a7eb97STahsin Erdogan "Expand inode array err=%d", err); 115330a7eb97STahsin Erdogan iput(ea_inode); 115430a7eb97STahsin Erdogan continue; 115530a7eb97STahsin Erdogan } 115630a7eb97STahsin Erdogan 1157a4130367SJan Kara err = ext4_journal_ensure_credits_fn(handle, credits, credits, 1158a4130367SJan Kara ext4_xattr_restart_fn(handle, parent, bh, block_csum, 1159a4130367SJan Kara dirty)); 1160a4130367SJan Kara if (err < 0) { 116130a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, "Ensure credits err=%d", 116230a7eb97STahsin Erdogan err); 116330a7eb97STahsin Erdogan continue; 116430a7eb97STahsin Erdogan } 1165a4130367SJan Kara if (err > 0) { 1166a4130367SJan Kara err = ext4_journal_get_write_access(handle, bh); 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"); 12278a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 12288a2bfdcbSMingming Cao if (error) 12298a2bfdcbSMingming Cao goto out; 12308a2bfdcbSMingming Cao 12318a2bfdcbSMingming Cao lock_buffer(bh); 12326048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 12336048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 12346048c64bSAndreas Gruenbacher if (ref == 1) { 1235ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 123682939d79SJan Kara /* 123782939d79SJan Kara * This must happen under buffer lock for 123882939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 123982939d79SJan Kara */ 1240cdb7ee4cSTahsin Erdogan if (ea_block_cache) 1241cdb7ee4cSTahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, 1242cdb7ee4cSTahsin Erdogan bh->b_blocknr); 1243ac27a0ecSDave Kleikamp get_bh(bh); 1244ec4cb1aaSJan Kara unlock_buffer(bh); 1245dec214d0STahsin Erdogan 1246dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) 1247dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, bh, 1248dec214d0STahsin Erdogan BFIRST(bh), 1249dec214d0STahsin Erdogan true /* block_csum */, 1250dec214d0STahsin Erdogan ea_inode_array, 1251dec214d0STahsin Erdogan extra_credits, 1252dec214d0STahsin Erdogan true /* skip_quota */); 1253e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 1254e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 1255e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 1256ac27a0ecSDave Kleikamp } else { 12576048c64bSAndreas Gruenbacher ref--; 12586048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 12596048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 12606048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 12616048c64bSAndreas Gruenbacher 1262cdb7ee4cSTahsin Erdogan if (ea_block_cache) { 126347387409STahsin Erdogan ce = mb_cache_entry_get(ea_block_cache, hash, 12646048c64bSAndreas Gruenbacher bh->b_blocknr); 12656048c64bSAndreas Gruenbacher if (ce) { 12666048c64bSAndreas Gruenbacher ce->e_reusable = 1; 126747387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 12686048c64bSAndreas Gruenbacher } 12696048c64bSAndreas Gruenbacher } 1270cdb7ee4cSTahsin Erdogan } 12716048c64bSAndreas Gruenbacher 1272dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bh); 1273ec4cb1aaSJan Kara /* 1274ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 1275ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 1276ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 1277ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 1278ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 1279dac7a4b4STheodore Ts'o * call ext4_handle_dirty_metadata() with locked buffer as 1280ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 1281ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 1282ec4cb1aaSJan Kara */ 1283ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 1284dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1285c1bb05a6SEric Sandeen unlock_buffer(bh); 1286ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 1287dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1288ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 12890390131bSFrank Mayhar ext4_handle_sync(handle); 12901231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 1291ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 1292ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 1293ac27a0ecSDave Kleikamp } 12948a2bfdcbSMingming Cao out: 12958a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 12968a2bfdcbSMingming Cao return; 1297ac27a0ecSDave Kleikamp } 1298ac27a0ecSDave Kleikamp 12996dd4ee7cSKalpak Shah /* 13006dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 13016dd4ee7cSKalpak Shah * bytes used by EA entries. 13026dd4ee7cSKalpak Shah */ 13036dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 13046dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 13056dd4ee7cSKalpak Shah { 13066dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1307e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 13086dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 13096dd4ee7cSKalpak Shah if (offs < *min_offs) 13106dd4ee7cSKalpak Shah *min_offs = offs; 13116dd4ee7cSKalpak Shah } 13127b1b2c1bSTheodore Ts'o if (total) 13137b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 13146dd4ee7cSKalpak Shah } 13156dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 13166dd4ee7cSKalpak Shah } 13176dd4ee7cSKalpak Shah 1318e50e5129SAndreas Dilger /* 1319e50e5129SAndreas Dilger * Write the value of the EA in an inode. 1320e50e5129SAndreas Dilger */ 1321e50e5129SAndreas Dilger static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, 1322e50e5129SAndreas Dilger const void *buf, int bufsize) 1323e50e5129SAndreas Dilger { 1324e50e5129SAndreas Dilger struct buffer_head *bh = NULL; 1325e50e5129SAndreas Dilger unsigned long block = 0; 1326dec214d0STahsin Erdogan int blocksize = ea_inode->i_sb->s_blocksize; 1327dec214d0STahsin Erdogan int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; 1328e50e5129SAndreas Dilger int csize, wsize = 0; 1329e50e5129SAndreas Dilger int ret = 0; 1330e50e5129SAndreas Dilger int retries = 0; 1331e50e5129SAndreas Dilger 1332e50e5129SAndreas Dilger retry: 1333e50e5129SAndreas Dilger while (ret >= 0 && ret < max_blocks) { 1334e50e5129SAndreas Dilger struct ext4_map_blocks map; 1335e50e5129SAndreas Dilger map.m_lblk = block += ret; 1336e50e5129SAndreas Dilger map.m_len = max_blocks -= ret; 1337e50e5129SAndreas Dilger 1338e50e5129SAndreas Dilger ret = ext4_map_blocks(handle, ea_inode, &map, 1339e50e5129SAndreas Dilger EXT4_GET_BLOCKS_CREATE); 1340e50e5129SAndreas Dilger if (ret <= 0) { 1341e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1342e50e5129SAndreas Dilger if (ret == -ENOSPC && 1343e50e5129SAndreas Dilger ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { 1344e50e5129SAndreas Dilger ret = 0; 1345e50e5129SAndreas Dilger goto retry; 1346e50e5129SAndreas Dilger } 1347e50e5129SAndreas Dilger break; 1348e50e5129SAndreas Dilger } 1349e50e5129SAndreas Dilger } 1350e50e5129SAndreas Dilger 1351e50e5129SAndreas Dilger if (ret < 0) 1352e50e5129SAndreas Dilger return ret; 1353e50e5129SAndreas Dilger 1354e50e5129SAndreas Dilger block = 0; 1355e50e5129SAndreas Dilger while (wsize < bufsize) { 1356e50e5129SAndreas Dilger if (bh != NULL) 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 } 1369e50e5129SAndreas Dilger ret = ext4_journal_get_write_access(handle, bh); 1370e50e5129SAndreas Dilger if (ret) 1371e50e5129SAndreas Dilger goto out; 1372e50e5129SAndreas Dilger 1373e50e5129SAndreas Dilger memcpy(bh->b_data, buf, csize); 1374e50e5129SAndreas Dilger set_buffer_uptodate(bh); 1375e50e5129SAndreas Dilger ext4_handle_dirty_metadata(handle, ea_inode, bh); 1376e50e5129SAndreas Dilger 1377e50e5129SAndreas Dilger buf += csize; 1378e50e5129SAndreas Dilger wsize += csize; 1379e50e5129SAndreas Dilger block += 1; 1380e50e5129SAndreas Dilger } 1381e50e5129SAndreas Dilger 1382e50e5129SAndreas Dilger inode_lock(ea_inode); 1383e50e5129SAndreas Dilger i_size_write(ea_inode, wsize); 1384e50e5129SAndreas Dilger ext4_update_i_disksize(ea_inode, wsize); 1385e50e5129SAndreas Dilger inode_unlock(ea_inode); 1386e50e5129SAndreas Dilger 1387e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1388e50e5129SAndreas Dilger 1389e50e5129SAndreas Dilger out: 1390e50e5129SAndreas Dilger brelse(bh); 1391e50e5129SAndreas Dilger 1392e50e5129SAndreas Dilger return ret; 1393e50e5129SAndreas Dilger } 1394e50e5129SAndreas Dilger 1395e50e5129SAndreas Dilger /* 1396e50e5129SAndreas Dilger * Create an inode to store the value of a large EA. 1397e50e5129SAndreas Dilger */ 1398e50e5129SAndreas Dilger static struct inode *ext4_xattr_inode_create(handle_t *handle, 1399dec214d0STahsin Erdogan struct inode *inode, u32 hash) 1400e50e5129SAndreas Dilger { 1401e50e5129SAndreas Dilger struct inode *ea_inode = NULL; 14029e1ba001STahsin Erdogan uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; 1403bd3b963bSTahsin Erdogan int err; 1404e50e5129SAndreas Dilger 1405e50e5129SAndreas Dilger /* 1406e50e5129SAndreas Dilger * Let the next inode be the goal, so we try and allocate the EA inode 1407e50e5129SAndreas Dilger * in the same group, or nearby one. 1408e50e5129SAndreas Dilger */ 1409e50e5129SAndreas Dilger ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, 14109e1ba001STahsin Erdogan S_IFREG | 0600, NULL, inode->i_ino + 1, owner, 14111b917ed8STahsin Erdogan EXT4_EA_INODE_FL); 1412e50e5129SAndreas Dilger if (!IS_ERR(ea_inode)) { 1413e50e5129SAndreas Dilger ea_inode->i_op = &ext4_file_inode_operations; 1414e50e5129SAndreas Dilger ea_inode->i_fop = &ext4_file_operations; 1415e50e5129SAndreas Dilger ext4_set_aops(ea_inode); 141633d201e0STahsin Erdogan ext4_xattr_inode_set_class(ea_inode); 1417e50e5129SAndreas Dilger unlock_new_inode(ea_inode); 1418dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, 1); 1419dec214d0STahsin Erdogan ext4_xattr_inode_set_hash(ea_inode, hash); 1420dec214d0STahsin Erdogan err = ext4_mark_inode_dirty(handle, ea_inode); 1421dec214d0STahsin Erdogan if (!err) 1422bd3b963bSTahsin Erdogan err = ext4_inode_attach_jinode(ea_inode); 1423bd3b963bSTahsin Erdogan if (err) { 1424bd3b963bSTahsin Erdogan iput(ea_inode); 1425bd3b963bSTahsin Erdogan return ERR_PTR(err); 1426bd3b963bSTahsin Erdogan } 1427dec214d0STahsin Erdogan 1428dec214d0STahsin Erdogan /* 1429dec214d0STahsin Erdogan * Xattr inodes are shared therefore quota charging is performed 1430dec214d0STahsin Erdogan * at a higher level. 1431dec214d0STahsin Erdogan */ 1432dec214d0STahsin Erdogan dquot_free_inode(ea_inode); 1433dec214d0STahsin Erdogan dquot_drop(ea_inode); 1434dec214d0STahsin Erdogan inode_lock(ea_inode); 1435dec214d0STahsin Erdogan ea_inode->i_flags |= S_NOQUOTA; 1436dec214d0STahsin Erdogan inode_unlock(ea_inode); 1437e50e5129SAndreas Dilger } 1438e50e5129SAndreas Dilger 1439e50e5129SAndreas Dilger return ea_inode; 1440e50e5129SAndreas Dilger } 1441e50e5129SAndreas Dilger 1442dec214d0STahsin Erdogan static struct inode * 1443dec214d0STahsin Erdogan ext4_xattr_inode_cache_find(struct inode *inode, const void *value, 1444dec214d0STahsin Erdogan size_t value_len, u32 hash) 1445e50e5129SAndreas Dilger { 1446dec214d0STahsin Erdogan struct inode *ea_inode; 1447dec214d0STahsin Erdogan struct mb_cache_entry *ce; 1448dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 1449dec214d0STahsin Erdogan void *ea_data; 1450e50e5129SAndreas Dilger 1451cdb7ee4cSTahsin Erdogan if (!ea_inode_cache) 1452cdb7ee4cSTahsin Erdogan return NULL; 1453cdb7ee4cSTahsin Erdogan 1454dec214d0STahsin Erdogan ce = mb_cache_entry_find_first(ea_inode_cache, hash); 1455dec214d0STahsin Erdogan if (!ce) 1456dec214d0STahsin Erdogan return NULL; 1457e50e5129SAndreas Dilger 1458dec214d0STahsin Erdogan ea_data = ext4_kvmalloc(value_len, GFP_NOFS); 1459dec214d0STahsin Erdogan if (!ea_data) { 1460dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1461dec214d0STahsin Erdogan return NULL; 1462dec214d0STahsin Erdogan } 1463dec214d0STahsin Erdogan 1464dec214d0STahsin Erdogan while (ce) { 14658a363970STheodore Ts'o ea_inode = ext4_iget(inode->i_sb, ce->e_value, 14668a363970STheodore Ts'o EXT4_IGET_NORMAL); 1467dec214d0STahsin Erdogan if (!IS_ERR(ea_inode) && 1468dec214d0STahsin Erdogan !is_bad_inode(ea_inode) && 1469dec214d0STahsin Erdogan (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && 1470dec214d0STahsin Erdogan i_size_read(ea_inode) == value_len && 1471dec214d0STahsin Erdogan !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && 1472b9fc761eSTahsin Erdogan !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, 1473dec214d0STahsin Erdogan value_len) && 1474dec214d0STahsin Erdogan !memcmp(value, ea_data, value_len)) { 1475dec214d0STahsin Erdogan mb_cache_entry_touch(ea_inode_cache, ce); 1476dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1477dec214d0STahsin Erdogan kvfree(ea_data); 1478dec214d0STahsin Erdogan return ea_inode; 1479dec214d0STahsin Erdogan } 1480dec214d0STahsin Erdogan 1481dec214d0STahsin Erdogan if (!IS_ERR(ea_inode)) 1482e50e5129SAndreas Dilger iput(ea_inode); 1483dec214d0STahsin Erdogan ce = mb_cache_entry_find_next(ea_inode_cache, ce); 1484dec214d0STahsin Erdogan } 1485dec214d0STahsin Erdogan kvfree(ea_data); 1486dec214d0STahsin Erdogan return NULL; 1487e50e5129SAndreas Dilger } 1488e50e5129SAndreas Dilger 1489e50e5129SAndreas Dilger /* 1490e50e5129SAndreas Dilger * Add value of the EA in an inode. 1491e50e5129SAndreas Dilger */ 1492dec214d0STahsin Erdogan static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, 1493dec214d0STahsin Erdogan const void *value, size_t value_len, 1494dec214d0STahsin Erdogan struct inode **ret_inode) 1495e50e5129SAndreas Dilger { 1496e50e5129SAndreas Dilger struct inode *ea_inode; 1497dec214d0STahsin Erdogan u32 hash; 1498e50e5129SAndreas Dilger int err; 1499e50e5129SAndreas Dilger 1500dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); 1501dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); 1502dec214d0STahsin Erdogan if (ea_inode) { 1503dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1504dec214d0STahsin Erdogan if (err) { 1505dec214d0STahsin Erdogan iput(ea_inode); 1506dec214d0STahsin Erdogan return err; 1507dec214d0STahsin Erdogan } 1508dec214d0STahsin Erdogan 1509dec214d0STahsin Erdogan *ret_inode = ea_inode; 1510dec214d0STahsin Erdogan return 0; 1511dec214d0STahsin Erdogan } 1512dec214d0STahsin Erdogan 1513e50e5129SAndreas Dilger /* Create an inode for the EA value */ 1514dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_create(handle, inode, hash); 1515e50e5129SAndreas Dilger if (IS_ERR(ea_inode)) 1516e50e5129SAndreas Dilger return PTR_ERR(ea_inode); 1517e50e5129SAndreas Dilger 1518e50e5129SAndreas Dilger err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); 1519dec214d0STahsin Erdogan if (err) { 1520dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref(handle, ea_inode); 1521e50e5129SAndreas Dilger iput(ea_inode); 1522e50e5129SAndreas Dilger return err; 1523e50e5129SAndreas Dilger } 1524e50e5129SAndreas Dilger 1525cdb7ee4cSTahsin Erdogan if (EA_INODE_CACHE(inode)) 1526dec214d0STahsin Erdogan mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, 1527dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 1528dec214d0STahsin Erdogan 1529dec214d0STahsin Erdogan *ret_inode = ea_inode; 1530dec214d0STahsin Erdogan return 0; 1531dec214d0STahsin Erdogan } 1532dec214d0STahsin Erdogan 15339c6e7853STahsin Erdogan /* 15349c6e7853STahsin Erdogan * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode 15359c6e7853STahsin Erdogan * feature is enabled. 15369c6e7853STahsin Erdogan */ 15379c6e7853STahsin Erdogan #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) 15389c6e7853STahsin Erdogan 1539e50e5129SAndreas Dilger static int ext4_xattr_set_entry(struct ext4_xattr_info *i, 1540e50e5129SAndreas Dilger struct ext4_xattr_search *s, 1541daf83281STahsin Erdogan handle_t *handle, struct inode *inode, 1542daf83281STahsin Erdogan bool is_block) 1543ac27a0ecSDave Kleikamp { 15445369a762STheodore Ts'o struct ext4_xattr_entry *last, *next; 1545dec214d0STahsin Erdogan struct ext4_xattr_entry *here = s->here; 1546dec214d0STahsin Erdogan size_t min_offs = s->end - s->base, name_len = strlen(i->name); 1547e50e5129SAndreas Dilger int in_inode = i->in_inode; 1548dec214d0STahsin Erdogan struct inode *old_ea_inode = NULL; 1549dec214d0STahsin Erdogan struct inode *new_ea_inode = NULL; 1550dec214d0STahsin Erdogan size_t old_size, new_size; 1551dec214d0STahsin Erdogan int ret; 1552dec214d0STahsin Erdogan 1553dec214d0STahsin Erdogan /* Space used by old and new values. */ 1554dec214d0STahsin Erdogan old_size = (!s->not_found && !here->e_value_inum) ? 1555dec214d0STahsin Erdogan EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; 1556dec214d0STahsin Erdogan new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; 1557dec214d0STahsin Erdogan 1558dec214d0STahsin Erdogan /* 1559dec214d0STahsin Erdogan * Optimization for the simple case when old and new values have the 1560dec214d0STahsin Erdogan * same padded sizes. Not applicable if external inodes are involved. 1561dec214d0STahsin Erdogan */ 1562dec214d0STahsin Erdogan if (new_size && new_size == old_size) { 1563dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1564dec214d0STahsin Erdogan void *val = s->base + offs; 1565dec214d0STahsin Erdogan 1566dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1567dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1568dec214d0STahsin Erdogan memset(val, 0, new_size); 1569dec214d0STahsin Erdogan } else { 1570dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1571dec214d0STahsin Erdogan /* Clear padding bytes. */ 1572dec214d0STahsin Erdogan memset(val + i->value_len, 0, new_size - i->value_len); 1573dec214d0STahsin Erdogan } 157432aaf194STahsin Erdogan goto update_hash; 1575dec214d0STahsin Erdogan } 1576e50e5129SAndreas Dilger 1577ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 1578ac27a0ecSDave Kleikamp last = s->first; 15795369a762STheodore Ts'o for (; !IS_LAST_ENTRY(last); last = next) { 15805369a762STheodore Ts'o next = EXT4_XATTR_NEXT(last); 15815369a762STheodore Ts'o if ((void *)next >= s->end) { 15825369a762STheodore Ts'o EXT4_ERROR_INODE(inode, "corrupted xattr entries"); 15835369a762STheodore Ts'o ret = -EFSCORRUPTED; 15845369a762STheodore Ts'o goto out; 15855369a762STheodore Ts'o } 1586e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 1587ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 1588ac27a0ecSDave Kleikamp if (offs < min_offs) 1589ac27a0ecSDave Kleikamp min_offs = offs; 1590ac27a0ecSDave Kleikamp } 1591ac27a0ecSDave Kleikamp } 1592dec214d0STahsin Erdogan 1593dec214d0STahsin Erdogan /* Check whether we have enough space. */ 1594ac27a0ecSDave Kleikamp if (i->value) { 1595dec214d0STahsin Erdogan size_t free; 1596e50e5129SAndreas Dilger 1597dec214d0STahsin Erdogan free = min_offs - ((void *)last - s->base) - sizeof(__u32); 1598dec214d0STahsin Erdogan if (!s->not_found) 1599dec214d0STahsin Erdogan free += EXT4_XATTR_LEN(name_len) + old_size; 1600e50e5129SAndreas Dilger 1601dec214d0STahsin Erdogan if (free < EXT4_XATTR_LEN(name_len) + new_size) { 1602dec214d0STahsin Erdogan ret = -ENOSPC; 1603dec214d0STahsin Erdogan goto out; 1604dec214d0STahsin Erdogan } 16059c6e7853STahsin Erdogan 16069c6e7853STahsin Erdogan /* 16079c6e7853STahsin Erdogan * If storing the value in an external inode is an option, 16089c6e7853STahsin Erdogan * reserve space for xattr entries/names in the external 16099c6e7853STahsin Erdogan * attribute block so that a long value does not occupy the 16109c6e7853STahsin Erdogan * whole space and prevent futher entries being added. 16119c6e7853STahsin Erdogan */ 1612daf83281STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 1613daf83281STahsin Erdogan new_size && is_block && 16149c6e7853STahsin Erdogan (min_offs + old_size - new_size) < 16159c6e7853STahsin Erdogan EXT4_XATTR_BLOCK_RESERVE(inode)) { 16169c6e7853STahsin Erdogan ret = -ENOSPC; 16179c6e7853STahsin Erdogan goto out; 16189c6e7853STahsin Erdogan } 1619ac27a0ecSDave Kleikamp } 1620ac27a0ecSDave Kleikamp 1621dec214d0STahsin Erdogan /* 1622dec214d0STahsin Erdogan * Getting access to old and new ea inodes is subject to failures. 1623dec214d0STahsin Erdogan * Finish that work before doing any modifications to the xattr data. 1624dec214d0STahsin Erdogan */ 1625dec214d0STahsin Erdogan if (!s->not_found && here->e_value_inum) { 1626dec214d0STahsin Erdogan ret = ext4_xattr_inode_iget(inode, 1627dec214d0STahsin Erdogan le32_to_cpu(here->e_value_inum), 1628a6d05676STahsin Erdogan le32_to_cpu(here->e_hash), 1629dec214d0STahsin Erdogan &old_ea_inode); 1630dec214d0STahsin Erdogan if (ret) { 1631dec214d0STahsin Erdogan old_ea_inode = NULL; 1632dec214d0STahsin Erdogan goto out; 1633bd9926e8STheodore Ts'o } 1634dec214d0STahsin Erdogan } 1635dec214d0STahsin Erdogan if (i->value && in_inode) { 1636dec214d0STahsin Erdogan WARN_ON_ONCE(!i->value_len); 1637dec214d0STahsin Erdogan 1638dec214d0STahsin Erdogan ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); 1639dec214d0STahsin Erdogan if (ret) 1640dec214d0STahsin Erdogan goto out; 1641dec214d0STahsin Erdogan 1642dec214d0STahsin Erdogan ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, 1643dec214d0STahsin Erdogan i->value_len, 1644dec214d0STahsin Erdogan &new_ea_inode); 1645dec214d0STahsin Erdogan if (ret) { 1646dec214d0STahsin Erdogan new_ea_inode = NULL; 1647a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, NULL, i->value_len); 1648dec214d0STahsin Erdogan goto out; 1649dec214d0STahsin Erdogan } 1650ac27a0ecSDave Kleikamp } 1651ac27a0ecSDave Kleikamp 1652dec214d0STahsin Erdogan if (old_ea_inode) { 1653dec214d0STahsin Erdogan /* We are ready to release ref count on the old_ea_inode. */ 1654dec214d0STahsin Erdogan ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); 1655dec214d0STahsin Erdogan if (ret) { 1656dec214d0STahsin Erdogan /* Release newly required ref count on new_ea_inode. */ 1657dec214d0STahsin Erdogan if (new_ea_inode) { 1658dec214d0STahsin Erdogan int err; 1659dec214d0STahsin Erdogan 1660dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, 1661dec214d0STahsin Erdogan new_ea_inode); 1662dec214d0STahsin Erdogan if (err) 1663dec214d0STahsin Erdogan ext4_warning_inode(new_ea_inode, 1664dec214d0STahsin Erdogan "dec ref new_ea_inode err=%d", 1665dec214d0STahsin Erdogan err); 1666a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, new_ea_inode, 1667dec214d0STahsin Erdogan i->value_len); 1668dec214d0STahsin Erdogan } 1669dec214d0STahsin Erdogan goto out; 1670dec214d0STahsin Erdogan } 1671dec214d0STahsin Erdogan 1672a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, old_ea_inode, 1673dec214d0STahsin Erdogan le32_to_cpu(here->e_value_size)); 1674dec214d0STahsin Erdogan } 1675dec214d0STahsin Erdogan 1676dec214d0STahsin Erdogan /* No failures allowed past this point. */ 1677dec214d0STahsin Erdogan 1678e5d01196STheodore Ts'o if (!s->not_found && here->e_value_size && !here->e_value_inum) { 1679ac27a0ecSDave Kleikamp /* Remove the old value. */ 1680dec214d0STahsin Erdogan void *first_val = s->base + min_offs; 1681dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1682dec214d0STahsin Erdogan void *val = s->base + offs; 1683dec214d0STahsin Erdogan 1684dec214d0STahsin Erdogan memmove(first_val + old_size, first_val, val - first_val); 1685dec214d0STahsin Erdogan memset(first_val, 0, old_size); 1686dec214d0STahsin Erdogan min_offs += old_size; 1687ac27a0ecSDave Kleikamp 1688ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 1689ac27a0ecSDave Kleikamp last = s->first; 1690ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 1691ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 1692dec214d0STahsin Erdogan 1693e50e5129SAndreas Dilger if (!last->e_value_inum && 1694e50e5129SAndreas Dilger last->e_value_size && o < offs) 1695dec214d0STahsin Erdogan last->e_value_offs = cpu_to_le16(o + old_size); 1696617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 1697ac27a0ecSDave Kleikamp } 1698ac27a0ecSDave Kleikamp } 1699dec214d0STahsin Erdogan 1700ac27a0ecSDave Kleikamp if (!i->value) { 1701dec214d0STahsin Erdogan /* Remove old name. */ 1702617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 1703dec214d0STahsin Erdogan 1704ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 1705dec214d0STahsin Erdogan memmove(here, (void *)here + size, 1706dec214d0STahsin Erdogan (void *)last - (void *)here + sizeof(__u32)); 1707ac27a0ecSDave Kleikamp memset(last, 0, size); 1708dec214d0STahsin Erdogan } else if (s->not_found) { 1709dec214d0STahsin Erdogan /* Insert new name. */ 1710dec214d0STahsin Erdogan size_t size = EXT4_XATTR_LEN(name_len); 1711dec214d0STahsin Erdogan size_t rest = (void *)last - (void *)here + sizeof(__u32); 1712dec214d0STahsin Erdogan 1713dec214d0STahsin Erdogan memmove((void *)here + size, here, rest); 1714dec214d0STahsin Erdogan memset(here, 0, size); 1715dec214d0STahsin Erdogan here->e_name_index = i->name_index; 1716dec214d0STahsin Erdogan here->e_name_len = name_len; 1717dec214d0STahsin Erdogan memcpy(here->e_name, i->name, name_len); 1718dec214d0STahsin Erdogan } else { 1719dec214d0STahsin Erdogan /* This is an update, reset value info. */ 1720dec214d0STahsin Erdogan here->e_value_inum = 0; 1721dec214d0STahsin Erdogan here->e_value_offs = 0; 1722dec214d0STahsin Erdogan here->e_value_size = 0; 1723ac27a0ecSDave Kleikamp } 1724ac27a0ecSDave Kleikamp 1725ac27a0ecSDave Kleikamp if (i->value) { 1726dec214d0STahsin Erdogan /* Insert new value. */ 1727e50e5129SAndreas Dilger if (in_inode) { 1728dec214d0STahsin Erdogan here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); 1729e50e5129SAndreas Dilger } else if (i->value_len) { 1730dec214d0STahsin Erdogan void *val = s->base + min_offs - new_size; 1731e50e5129SAndreas Dilger 1732dec214d0STahsin Erdogan here->e_value_offs = cpu_to_le16(min_offs - new_size); 1733dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1734dec214d0STahsin Erdogan memset(val, 0, new_size); 1735dec214d0STahsin Erdogan } else { 1736dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1737dec214d0STahsin Erdogan /* Clear padding bytes. */ 1738dec214d0STahsin Erdogan memset(val + i->value_len, 0, 1739dec214d0STahsin Erdogan new_size - i->value_len); 1740dec214d0STahsin Erdogan } 1741dec214d0STahsin Erdogan } 1742dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1743dec214d0STahsin Erdogan } 1744daf83281STahsin Erdogan 174532aaf194STahsin Erdogan update_hash: 1746b9fc761eSTahsin Erdogan if (i->value) { 1747b9fc761eSTahsin Erdogan __le32 hash = 0; 1748b9fc761eSTahsin Erdogan 1749b9fc761eSTahsin Erdogan /* Entry hash calculation. */ 1750b9fc761eSTahsin Erdogan if (in_inode) { 1751b9fc761eSTahsin Erdogan __le32 crc32c_hash; 1752b9fc761eSTahsin Erdogan 1753b9fc761eSTahsin Erdogan /* 1754b9fc761eSTahsin Erdogan * Feed crc32c hash instead of the raw value for entry 1755b9fc761eSTahsin Erdogan * hash calculation. This is to avoid walking 1756b9fc761eSTahsin Erdogan * potentially long value buffer again. 1757b9fc761eSTahsin Erdogan */ 1758b9fc761eSTahsin Erdogan crc32c_hash = cpu_to_le32( 1759b9fc761eSTahsin Erdogan ext4_xattr_inode_get_hash(new_ea_inode)); 1760b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1761b9fc761eSTahsin Erdogan here->e_name_len, 1762b9fc761eSTahsin Erdogan &crc32c_hash, 1); 1763b9fc761eSTahsin Erdogan } else if (is_block) { 176432aaf194STahsin Erdogan __le32 *value = s->base + le16_to_cpu( 176532aaf194STahsin Erdogan here->e_value_offs); 1766b9fc761eSTahsin Erdogan 1767b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1768b9fc761eSTahsin Erdogan here->e_name_len, value, 1769b9fc761eSTahsin Erdogan new_size >> 2); 1770daf83281STahsin Erdogan } 1771b9fc761eSTahsin Erdogan here->e_hash = hash; 1772b9fc761eSTahsin Erdogan } 1773b9fc761eSTahsin Erdogan 1774b9fc761eSTahsin Erdogan if (is_block) 1775b9fc761eSTahsin Erdogan ext4_xattr_rehash((struct ext4_xattr_header *)s->base); 1776daf83281STahsin Erdogan 1777dec214d0STahsin Erdogan ret = 0; 1778e50e5129SAndreas Dilger out: 1779dec214d0STahsin Erdogan iput(old_ea_inode); 1780dec214d0STahsin Erdogan iput(new_ea_inode); 1781dec214d0STahsin Erdogan return ret; 1782ac27a0ecSDave Kleikamp } 1783ac27a0ecSDave Kleikamp 1784617ba13bSMingming Cao struct ext4_xattr_block_find { 1785617ba13bSMingming Cao struct ext4_xattr_search s; 1786ac27a0ecSDave Kleikamp struct buffer_head *bh; 1787ac27a0ecSDave Kleikamp }; 1788ac27a0ecSDave Kleikamp 1789ac27a0ecSDave Kleikamp static int 1790617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 1791617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1792ac27a0ecSDave Kleikamp { 1793ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1794ac27a0ecSDave Kleikamp int error; 1795ac27a0ecSDave Kleikamp 1796ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 1797ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 1798ac27a0ecSDave Kleikamp 1799617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 1800ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 1801fb265c9cSTheodore Ts'o bs->bh = ext4_sb_bread(sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 1802fb265c9cSTheodore Ts'o if (IS_ERR(bs->bh)) 1803fb265c9cSTheodore Ts'o return PTR_ERR(bs->bh); 1804ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 1805ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 1806ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 1807de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bs->bh); 1808de05ca85STheodore Ts'o if (error) 1809fb265c9cSTheodore Ts'o return error; 1810ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1811ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 1812ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 1813ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 1814ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 18159496005dSTheodore Ts'o error = xattr_find_entry(inode, &bs->s.here, bs->s.end, 18169496005dSTheodore Ts'o i->name_index, i->name, 1); 1817ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1818fb265c9cSTheodore Ts'o return error; 1819ac27a0ecSDave Kleikamp bs->s.not_found = error; 1820ac27a0ecSDave Kleikamp } 1821fb265c9cSTheodore Ts'o return 0; 1822ac27a0ecSDave Kleikamp } 1823ac27a0ecSDave Kleikamp 1824ac27a0ecSDave Kleikamp static int 1825617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 1826617ba13bSMingming Cao struct ext4_xattr_info *i, 1827617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1828ac27a0ecSDave Kleikamp { 1829ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1830ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 1831b347e2bcSTahsin Erdogan struct ext4_xattr_search s_copy = bs->s; 1832b347e2bcSTahsin Erdogan struct ext4_xattr_search *s = &s_copy; 18337a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 18348a2bfdcbSMingming Cao int error = 0; 183547387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 1836a6d05676STahsin Erdogan struct inode *ea_inode = NULL, *tmp_inode; 1837a6d05676STahsin Erdogan size_t old_ea_inode_quota = 0; 1838a6d05676STahsin Erdogan unsigned int ea_ino; 1839a6d05676STahsin Erdogan 1840ac27a0ecSDave Kleikamp 1841617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 1842ac27a0ecSDave Kleikamp 1843ac27a0ecSDave Kleikamp if (s->base) { 18445d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 18458a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 18468a2bfdcbSMingming Cao if (error) 18478a2bfdcbSMingming Cao goto cleanup; 18488a2bfdcbSMingming Cao lock_buffer(bs->bh); 18498a2bfdcbSMingming Cao 1850ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 185182939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 185282939d79SJan Kara 185382939d79SJan Kara /* 185482939d79SJan Kara * This must happen under buffer lock for 185582939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 185682939d79SJan Kara * block 185782939d79SJan Kara */ 1858cdb7ee4cSTahsin Erdogan if (ea_block_cache) 185947387409STahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, 186082939d79SJan Kara bs->bh->b_blocknr); 1861ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 1862daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 1863daf83281STahsin Erdogan true /* is_block */); 1864dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bs->bh); 1865ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 18666a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1867ac27a0ecSDave Kleikamp goto bad_block; 1868ac27a0ecSDave Kleikamp if (!error) 1869dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 18700390131bSFrank Mayhar inode, 1871ac27a0ecSDave Kleikamp bs->bh); 1872ac27a0ecSDave Kleikamp if (error) 1873ac27a0ecSDave Kleikamp goto cleanup; 1874ac27a0ecSDave Kleikamp goto inserted; 1875ac27a0ecSDave Kleikamp } else { 1876ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 1877ac27a0ecSDave Kleikamp 18788a2bfdcbSMingming Cao unlock_buffer(bs->bh); 1879ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 1880216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 1881ac27a0ecSDave Kleikamp error = -ENOMEM; 1882ac27a0ecSDave Kleikamp if (s->base == NULL) 1883ac27a0ecSDave Kleikamp goto cleanup; 1884ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 1885ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1886ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1887ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 1888ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 1889dec214d0STahsin Erdogan 1890dec214d0STahsin Erdogan /* 1891dec214d0STahsin Erdogan * If existing entry points to an xattr inode, we need 1892dec214d0STahsin Erdogan * to prevent ext4_xattr_set_entry() from decrementing 1893dec214d0STahsin Erdogan * ref count on it because the reference belongs to the 1894dec214d0STahsin Erdogan * original block. In this case, make the entry look 1895dec214d0STahsin Erdogan * like it has an empty value. 1896dec214d0STahsin Erdogan */ 1897dec214d0STahsin Erdogan if (!s->not_found && s->here->e_value_inum) { 1898a6d05676STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 1899a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, 1900a6d05676STahsin Erdogan le32_to_cpu(s->here->e_hash), 1901a6d05676STahsin Erdogan &tmp_inode); 1902a6d05676STahsin Erdogan if (error) 1903a6d05676STahsin Erdogan goto cleanup; 1904a6d05676STahsin Erdogan 1905a6d05676STahsin Erdogan if (!ext4_test_inode_state(tmp_inode, 1906a6d05676STahsin Erdogan EXT4_STATE_LUSTRE_EA_INODE)) { 1907dec214d0STahsin Erdogan /* 1908a6d05676STahsin Erdogan * Defer quota free call for previous 1909a6d05676STahsin Erdogan * inode until success is guaranteed. 1910dec214d0STahsin Erdogan */ 1911a6d05676STahsin Erdogan old_ea_inode_quota = le32_to_cpu( 1912dec214d0STahsin Erdogan s->here->e_value_size); 1913a6d05676STahsin Erdogan } 1914a6d05676STahsin Erdogan iput(tmp_inode); 1915a6d05676STahsin Erdogan 1916dec214d0STahsin Erdogan s->here->e_value_inum = 0; 1917dec214d0STahsin Erdogan s->here->e_value_size = 0; 1918dec214d0STahsin Erdogan } 1919ac27a0ecSDave Kleikamp } 1920ac27a0ecSDave Kleikamp } else { 1921ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 1922216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 1923ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 1924ac27a0ecSDave Kleikamp error = -ENOMEM; 1925ac27a0ecSDave Kleikamp if (s->base == NULL) 1926ac27a0ecSDave Kleikamp goto cleanup; 1927617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 1928ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 1929ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1930ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1931ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 1932ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 1933ac27a0ecSDave Kleikamp } 1934ac27a0ecSDave Kleikamp 1935daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); 19366a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1937ac27a0ecSDave Kleikamp goto bad_block; 1938ac27a0ecSDave Kleikamp if (error) 1939ac27a0ecSDave Kleikamp goto cleanup; 1940dec214d0STahsin Erdogan 1941dec214d0STahsin Erdogan if (i->value && s->here->e_value_inum) { 1942dec214d0STahsin Erdogan /* 1943dec214d0STahsin Erdogan * A ref count on ea_inode has been taken as part of the call to 1944dec214d0STahsin Erdogan * ext4_xattr_set_entry() above. We would like to drop this 1945dec214d0STahsin Erdogan * extra ref but we have to wait until the xattr block is 1946dec214d0STahsin Erdogan * initialized and has its own ref count on the ea_inode. 1947dec214d0STahsin Erdogan */ 1948dec214d0STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 1949a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, 1950a6d05676STahsin Erdogan le32_to_cpu(s->here->e_hash), 1951a6d05676STahsin Erdogan &ea_inode); 1952dec214d0STahsin Erdogan if (error) { 1953dec214d0STahsin Erdogan ea_inode = NULL; 1954dec214d0STahsin Erdogan goto cleanup; 1955dec214d0STahsin Erdogan } 1956dec214d0STahsin Erdogan } 1957dec214d0STahsin Erdogan 1958ac27a0ecSDave Kleikamp inserted: 1959ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 196047387409STahsin Erdogan new_bh = ext4_xattr_block_cache_find(inode, header(s->base), 196147387409STahsin Erdogan &ce); 1962ac27a0ecSDave Kleikamp if (new_bh) { 1963ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 1964ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 1965ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 1966ac27a0ecSDave Kleikamp else { 19676048c64bSAndreas Gruenbacher u32 ref; 19686048c64bSAndreas Gruenbacher 1969b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 1970b8cb5a54STahsin Erdogan 1971ac27a0ecSDave Kleikamp /* The old block is released after updating 1972ac27a0ecSDave Kleikamp the inode. */ 19731231b3a1SLukas Czerner error = dquot_alloc_block(inode, 19741231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 19755dd4056dSChristoph Hellwig if (error) 1976ac27a0ecSDave Kleikamp goto cleanup; 19775d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 1978617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 1979ac27a0ecSDave Kleikamp new_bh); 1980ac27a0ecSDave Kleikamp if (error) 1981ac27a0ecSDave Kleikamp goto cleanup_dquot; 1982ac27a0ecSDave Kleikamp lock_buffer(new_bh); 198382939d79SJan Kara /* 198482939d79SJan Kara * We have to be careful about races with 19856048c64bSAndreas Gruenbacher * freeing, rehashing or adding references to 19866048c64bSAndreas Gruenbacher * xattr block. Once we hold buffer lock xattr 19876048c64bSAndreas Gruenbacher * block's state is stable so we can check 19886048c64bSAndreas Gruenbacher * whether the block got freed / rehashed or 19896048c64bSAndreas Gruenbacher * not. Since we unhash mbcache entry under 19906048c64bSAndreas Gruenbacher * buffer lock when freeing / rehashing xattr 19916048c64bSAndreas Gruenbacher * block, checking whether entry is still 19926048c64bSAndreas Gruenbacher * hashed is reliable. Same rules hold for 19936048c64bSAndreas Gruenbacher * e_reusable handling. 199482939d79SJan Kara */ 19956048c64bSAndreas Gruenbacher if (hlist_bl_unhashed(&ce->e_hash_list) || 19966048c64bSAndreas Gruenbacher !ce->e_reusable) { 199782939d79SJan Kara /* 199882939d79SJan Kara * Undo everything and check mbcache 199982939d79SJan Kara * again. 200082939d79SJan Kara */ 200182939d79SJan Kara unlock_buffer(new_bh); 200282939d79SJan Kara dquot_free_block(inode, 200382939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 200482939d79SJan Kara 1)); 200582939d79SJan Kara brelse(new_bh); 200647387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 200782939d79SJan Kara ce = NULL; 200882939d79SJan Kara new_bh = NULL; 200982939d79SJan Kara goto inserted; 201082939d79SJan Kara } 20116048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 20126048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 20136048c64bSAndreas Gruenbacher if (ref >= EXT4_XATTR_REFCOUNT_MAX) 20146048c64bSAndreas Gruenbacher ce->e_reusable = 0; 2015ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 20166048c64bSAndreas Gruenbacher ref); 2017dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2018ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2019dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 20200390131bSFrank Mayhar inode, 2021ac27a0ecSDave Kleikamp new_bh); 2022ac27a0ecSDave Kleikamp if (error) 2023ac27a0ecSDave Kleikamp goto cleanup_dquot; 2024ac27a0ecSDave Kleikamp } 202547387409STahsin Erdogan mb_cache_entry_touch(ea_block_cache, ce); 202647387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2027ac27a0ecSDave Kleikamp ce = NULL; 2028ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 2029ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 2030ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 2031ec000220STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); 2032ac27a0ecSDave Kleikamp new_bh = bs->bh; 2033ac27a0ecSDave Kleikamp get_bh(new_bh); 2034ac27a0ecSDave Kleikamp } else { 2035ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 2036fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 2037fb0a387dSEric Sandeen 2038b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 2039b8cb5a54STahsin Erdogan 2040fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 2041d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 2042fb0a387dSEric Sandeen 2043fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 204412e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 2045fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 2046fb0a387dSEric Sandeen 204755f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 204855f020dbSAllison Henderson NULL, &error); 2049ac27a0ecSDave Kleikamp if (error) 2050ac27a0ecSDave Kleikamp goto cleanup; 2051fb0a387dSEric Sandeen 205212e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 2053fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 2054fb0a387dSEric Sandeen 2055ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 2056ace36ad4SJoe Perches (unsigned long long)block); 2057ac27a0ecSDave Kleikamp 2058ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 2059aebf0243SWang Shilong if (unlikely(!new_bh)) { 2060860d21e2STheodore Ts'o error = -ENOMEM; 2061ac27a0ecSDave Kleikamp getblk_failed: 20627dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 2063e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 2064ac27a0ecSDave Kleikamp goto cleanup; 2065ac27a0ecSDave Kleikamp } 2066dec214d0STahsin Erdogan error = ext4_xattr_inode_inc_ref_all(handle, inode, 2067dec214d0STahsin Erdogan ENTRY(header(s->base)+1)); 2068dec214d0STahsin Erdogan if (error) 2069dec214d0STahsin Erdogan goto getblk_failed; 2070dec214d0STahsin Erdogan if (ea_inode) { 2071dec214d0STahsin Erdogan /* Drop the extra ref on ea_inode. */ 2072dec214d0STahsin Erdogan error = ext4_xattr_inode_dec_ref(handle, 2073dec214d0STahsin Erdogan ea_inode); 2074dec214d0STahsin Erdogan if (error) 2075dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 2076dec214d0STahsin Erdogan "dec ref error=%d", 2077dec214d0STahsin Erdogan error); 2078dec214d0STahsin Erdogan iput(ea_inode); 2079dec214d0STahsin Erdogan ea_inode = NULL; 2080dec214d0STahsin Erdogan } 2081dec214d0STahsin Erdogan 2082ac27a0ecSDave Kleikamp lock_buffer(new_bh); 2083617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 2084ac27a0ecSDave Kleikamp if (error) { 2085ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2086860d21e2STheodore Ts'o error = -EIO; 2087ac27a0ecSDave Kleikamp goto getblk_failed; 2088ac27a0ecSDave Kleikamp } 2089ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 2090dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2091ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 2092ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 209347387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, new_bh); 2094dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, 2095dac7a4b4STheodore Ts'o new_bh); 2096ac27a0ecSDave Kleikamp if (error) 2097ac27a0ecSDave Kleikamp goto cleanup; 2098ac27a0ecSDave Kleikamp } 2099ac27a0ecSDave Kleikamp } 2100ac27a0ecSDave Kleikamp 2101a6d05676STahsin Erdogan if (old_ea_inode_quota) 2102a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, NULL, old_ea_inode_quota); 2103dec214d0STahsin Erdogan 2104ac27a0ecSDave Kleikamp /* Update the inode. */ 2105617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 2106ac27a0ecSDave Kleikamp 2107ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 2108dec214d0STahsin Erdogan if (bs->bh && bs->bh != new_bh) { 2109dec214d0STahsin Erdogan struct ext4_xattr_inode_array *ea_inode_array = NULL; 2110dec214d0STahsin Erdogan 2111dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bs->bh, 2112dec214d0STahsin Erdogan &ea_inode_array, 2113dec214d0STahsin Erdogan 0 /* extra_credits */); 2114dec214d0STahsin Erdogan ext4_xattr_inode_array_free(ea_inode_array); 2115dec214d0STahsin Erdogan } 2116ac27a0ecSDave Kleikamp error = 0; 2117ac27a0ecSDave Kleikamp 2118ac27a0ecSDave Kleikamp cleanup: 2119dec214d0STahsin Erdogan if (ea_inode) { 2120dec214d0STahsin Erdogan int error2; 2121dec214d0STahsin Erdogan 2122dec214d0STahsin Erdogan error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); 2123dec214d0STahsin Erdogan if (error2) 2124dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "dec ref error=%d", 2125dec214d0STahsin Erdogan error2); 2126dec214d0STahsin Erdogan 2127dec214d0STahsin Erdogan /* If there was an error, revert the quota charge. */ 2128dec214d0STahsin Erdogan if (error) 2129a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, ea_inode, 2130dec214d0STahsin Erdogan i_size_read(ea_inode)); 2131dec214d0STahsin Erdogan iput(ea_inode); 2132dec214d0STahsin Erdogan } 2133ac27a0ecSDave Kleikamp if (ce) 213447387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2135ac27a0ecSDave Kleikamp brelse(new_bh); 2136ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 2137ac27a0ecSDave Kleikamp kfree(s->base); 2138ac27a0ecSDave Kleikamp 2139ac27a0ecSDave Kleikamp return error; 2140ac27a0ecSDave Kleikamp 2141ac27a0ecSDave Kleikamp cleanup_dquot: 21421231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 2143ac27a0ecSDave Kleikamp goto cleanup; 2144ac27a0ecSDave Kleikamp 2145ac27a0ecSDave Kleikamp bad_block: 214624676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 214724676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2148ac27a0ecSDave Kleikamp goto cleanup; 2149ac27a0ecSDave Kleikamp 2150ac27a0ecSDave Kleikamp #undef header 2151ac27a0ecSDave Kleikamp } 2152ac27a0ecSDave Kleikamp 2153879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 2154617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2155ac27a0ecSDave Kleikamp { 2156617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2157617ba13bSMingming Cao struct ext4_inode *raw_inode; 2158ac27a0ecSDave Kleikamp int error; 2159ac27a0ecSDave Kleikamp 2160617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 2161ac27a0ecSDave Kleikamp return 0; 2162617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 2163ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 2164ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 2165ac27a0ecSDave Kleikamp is->s.here = is->s.first; 2166617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 216719f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 21689e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 2169ac27a0ecSDave Kleikamp if (error) 2170ac27a0ecSDave Kleikamp return error; 2171ac27a0ecSDave Kleikamp /* Find the named attribute. */ 21729496005dSTheodore Ts'o error = xattr_find_entry(inode, &is->s.here, is->s.end, 21739496005dSTheodore Ts'o i->name_index, i->name, 0); 2174ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 2175ac27a0ecSDave Kleikamp return error; 2176ac27a0ecSDave Kleikamp is->s.not_found = error; 2177ac27a0ecSDave Kleikamp } 2178ac27a0ecSDave Kleikamp return 0; 2179ac27a0ecSDave Kleikamp } 2180ac27a0ecSDave Kleikamp 21810d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 21820d812f77STao Ma struct ext4_xattr_info *i, 21830d812f77STao Ma struct ext4_xattr_ibody_find *is) 21840d812f77STao Ma { 21850d812f77STao Ma struct ext4_xattr_ibody_header *header; 21860d812f77STao Ma struct ext4_xattr_search *s = &is->s; 21870d812f77STao Ma int error; 21880d812f77STao Ma 21890d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 21900d812f77STao Ma return -ENOSPC; 2191daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 21920d812f77STao Ma if (error) 21930d812f77STao Ma return error; 21940d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 21950d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 21960d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 21970d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 21980d812f77STao Ma } else { 21990d812f77STao Ma header->h_magic = cpu_to_le32(0); 22000d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 22010d812f77STao Ma } 22020d812f77STao Ma return 0; 22030d812f77STao Ma } 22040d812f77STao Ma 2205e50e5129SAndreas Dilger static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 2206617ba13bSMingming Cao struct ext4_xattr_info *i, 2207617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2208ac27a0ecSDave Kleikamp { 2209617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2210617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 2211ac27a0ecSDave Kleikamp int error; 2212ac27a0ecSDave Kleikamp 2213617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 2214ac27a0ecSDave Kleikamp return -ENOSPC; 2215daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 2216ac27a0ecSDave Kleikamp if (error) 2217ac27a0ecSDave Kleikamp return error; 2218617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 2219ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 2220617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 222119f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 2222ac27a0ecSDave Kleikamp } else { 2223ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 222419f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 2225ac27a0ecSDave Kleikamp } 2226ac27a0ecSDave Kleikamp return 0; 2227ac27a0ecSDave Kleikamp } 2228ac27a0ecSDave Kleikamp 22293fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 22303fd16462SJan Kara struct ext4_xattr_info *i) 22313fd16462SJan Kara { 22323fd16462SJan Kara void *value; 22333fd16462SJan Kara 22340bd454c0STahsin Erdogan /* When e_value_inum is set the value is stored externally. */ 22350bd454c0STahsin Erdogan if (s->here->e_value_inum) 22360bd454c0STahsin Erdogan return 0; 22373fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 22383fd16462SJan Kara return 0; 22393fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 22403fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 22413fd16462SJan Kara } 22423fd16462SJan Kara 2243dec214d0STahsin Erdogan static struct buffer_head *ext4_xattr_get_block(struct inode *inode) 2244dec214d0STahsin Erdogan { 2245dec214d0STahsin Erdogan struct buffer_head *bh; 2246dec214d0STahsin Erdogan int error; 2247dec214d0STahsin Erdogan 2248dec214d0STahsin Erdogan if (!EXT4_I(inode)->i_file_acl) 2249dec214d0STahsin Erdogan return NULL; 2250fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2251fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 2252fb265c9cSTheodore Ts'o return bh; 2253dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2254ecaaf408SVasily Averin if (error) { 2255ecaaf408SVasily Averin brelse(bh); 2256dec214d0STahsin Erdogan return ERR_PTR(error); 2257ecaaf408SVasily Averin } 2258dec214d0STahsin Erdogan return bh; 2259dec214d0STahsin Erdogan } 2260dec214d0STahsin Erdogan 2261ac27a0ecSDave Kleikamp /* 2262617ba13bSMingming Cao * ext4_xattr_set_handle() 2263ac27a0ecSDave Kleikamp * 22646e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 2265ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 2266ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 2267ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 2268ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 2269ac27a0ecSDave Kleikamp * previous to the call, respectively. 2270ac27a0ecSDave Kleikamp * 2271ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2272ac27a0ecSDave Kleikamp */ 2273ac27a0ecSDave Kleikamp int 2274617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 2275ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 2276ac27a0ecSDave Kleikamp int flags) 2277ac27a0ecSDave Kleikamp { 2278617ba13bSMingming Cao struct ext4_xattr_info i = { 2279ac27a0ecSDave Kleikamp .name_index = name_index, 2280ac27a0ecSDave Kleikamp .name = name, 2281ac27a0ecSDave Kleikamp .value = value, 2282ac27a0ecSDave Kleikamp .value_len = value_len, 2283e50e5129SAndreas Dilger .in_inode = 0, 2284ac27a0ecSDave Kleikamp }; 2285617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 2286ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2287ac27a0ecSDave Kleikamp }; 2288617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 2289ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2290ac27a0ecSDave Kleikamp }; 2291c755e251STheodore Ts'o int no_expand; 2292ac27a0ecSDave Kleikamp int error; 2293ac27a0ecSDave Kleikamp 2294ac27a0ecSDave Kleikamp if (!name) 2295ac27a0ecSDave Kleikamp return -EINVAL; 2296ac27a0ecSDave Kleikamp if (strlen(name) > 255) 2297ac27a0ecSDave Kleikamp return -ERANGE; 2298b8cb5a54STahsin Erdogan 2299c755e251STheodore Ts'o ext4_write_lock_xattr(inode, &no_expand); 23004d20c685SKalpak Shah 2301c1a5d5f6STahsin Erdogan /* Check journal credits under write lock. */ 2302c1a5d5f6STahsin Erdogan if (ext4_handle_valid(handle)) { 2303dec214d0STahsin Erdogan struct buffer_head *bh; 2304c1a5d5f6STahsin Erdogan int credits; 2305c1a5d5f6STahsin Erdogan 2306dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2307dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2308dec214d0STahsin Erdogan error = PTR_ERR(bh); 2309dec214d0STahsin Erdogan goto cleanup; 2310dec214d0STahsin Erdogan } 2311dec214d0STahsin Erdogan 2312af65207cSTahsin Erdogan credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2313af65207cSTahsin Erdogan value_len, 2314af65207cSTahsin Erdogan flags & XATTR_CREATE); 2315dec214d0STahsin Erdogan brelse(bh); 2316dec214d0STahsin Erdogan 2317*a9a8344eSJan Kara if (jbd2_handle_buffer_credits(handle) < credits) { 2318c1a5d5f6STahsin Erdogan error = -ENOSPC; 2319c1a5d5f6STahsin Erdogan goto cleanup; 2320c1a5d5f6STahsin Erdogan } 2321c1a5d5f6STahsin Erdogan } 2322c1a5d5f6STahsin Erdogan 232366543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 232486ebfd08SEric Sandeen if (error) 232586ebfd08SEric Sandeen goto cleanup; 232686ebfd08SEric Sandeen 232719f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 2328617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 2329617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 233019f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 2331ac27a0ecSDave Kleikamp } 2332ac27a0ecSDave Kleikamp 2333617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 2334ac27a0ecSDave Kleikamp if (error) 2335ac27a0ecSDave Kleikamp goto cleanup; 2336ac27a0ecSDave Kleikamp if (is.s.not_found) 2337617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 2338ac27a0ecSDave Kleikamp if (error) 2339ac27a0ecSDave Kleikamp goto cleanup; 2340ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 2341ac27a0ecSDave Kleikamp error = -ENODATA; 2342ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 2343ac27a0ecSDave Kleikamp goto cleanup; 2344ac27a0ecSDave Kleikamp error = 0; 2345ac27a0ecSDave Kleikamp if (!value) 2346ac27a0ecSDave Kleikamp goto cleanup; 2347ac27a0ecSDave Kleikamp } else { 2348ac27a0ecSDave Kleikamp error = -EEXIST; 2349ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 2350ac27a0ecSDave Kleikamp goto cleanup; 2351ac27a0ecSDave Kleikamp } 2352dec214d0STahsin Erdogan 2353ac27a0ecSDave Kleikamp if (!value) { 2354ac27a0ecSDave Kleikamp if (!is.s.not_found) 2355e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2356ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 2357617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2358ac27a0ecSDave Kleikamp } else { 23593fd16462SJan Kara error = 0; 23603fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 23613fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 23623fd16462SJan Kara goto cleanup; 23633fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 23643fd16462SJan Kara goto cleanup; 23653fd16462SJan Kara 2366b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2367b347e2bcSTahsin Erdogan (EXT4_XATTR_SIZE(i.value_len) > 2368b347e2bcSTahsin Erdogan EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) 2369b347e2bcSTahsin Erdogan i.in_inode = 1; 2370b347e2bcSTahsin Erdogan retry_inode: 2371e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2372ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 2373ac27a0ecSDave Kleikamp i.value = NULL; 2374617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2375ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 23767e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 237745ae932dSVasily Averin brelse(bs.bh); 237845ae932dSVasily Averin bs.bh = NULL; 23797e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 23807e01c8e5STiger Yang if (error) 23817e01c8e5STiger Yang goto cleanup; 23827e01c8e5STiger Yang } 2383617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2384b347e2bcSTahsin Erdogan if (!error && !is.s.not_found) { 2385ac27a0ecSDave Kleikamp i.value = NULL; 2386e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, 2387e50e5129SAndreas Dilger &is); 2388b347e2bcSTahsin Erdogan } else if (error == -ENOSPC) { 2389b347e2bcSTahsin Erdogan /* 2390b347e2bcSTahsin Erdogan * Xattr does not fit in the block, store at 2391b347e2bcSTahsin Erdogan * external inode if possible. 2392b347e2bcSTahsin Erdogan */ 2393b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2394b347e2bcSTahsin Erdogan !i.in_inode) { 2395b347e2bcSTahsin Erdogan i.in_inode = 1; 2396b347e2bcSTahsin Erdogan goto retry_inode; 2397b347e2bcSTahsin Erdogan } 2398ac27a0ecSDave Kleikamp } 2399ac27a0ecSDave Kleikamp } 2400ac27a0ecSDave Kleikamp } 2401ac27a0ecSDave Kleikamp if (!error) { 2402617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 2403eeca7ea1SDeepa Dinamani inode->i_ctime = current_time(inode); 24046dd4ee7cSKalpak Shah if (!value) 2405c755e251STheodore Ts'o no_expand = 0; 2406617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 2407ac27a0ecSDave Kleikamp /* 2408617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 2409ac27a0ecSDave Kleikamp * error != 0. 2410ac27a0ecSDave Kleikamp */ 2411ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 2412ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 24130390131bSFrank Mayhar ext4_handle_sync(handle); 2414ac27a0ecSDave Kleikamp } 2415ac27a0ecSDave Kleikamp 2416ac27a0ecSDave Kleikamp cleanup: 2417ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 2418ac27a0ecSDave Kleikamp brelse(bs.bh); 2419c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 2420ac27a0ecSDave Kleikamp return error; 2421ac27a0ecSDave Kleikamp } 2422ac27a0ecSDave Kleikamp 2423af65207cSTahsin Erdogan int ext4_xattr_set_credits(struct inode *inode, size_t value_len, 2424af65207cSTahsin Erdogan bool is_create, int *credits) 2425c1a5d5f6STahsin Erdogan { 2426dec214d0STahsin Erdogan struct buffer_head *bh; 2427dec214d0STahsin Erdogan int err; 2428c1a5d5f6STahsin Erdogan 2429dec214d0STahsin Erdogan *credits = 0; 2430dec214d0STahsin Erdogan 2431dec214d0STahsin Erdogan if (!EXT4_SB(inode->i_sb)->s_journal) 2432c1a5d5f6STahsin Erdogan return 0; 2433c1a5d5f6STahsin Erdogan 2434dec214d0STahsin Erdogan down_read(&EXT4_I(inode)->xattr_sem); 2435c1a5d5f6STahsin Erdogan 2436dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2437dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2438dec214d0STahsin Erdogan err = PTR_ERR(bh); 2439dec214d0STahsin Erdogan } else { 2440af65207cSTahsin Erdogan *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2441af65207cSTahsin Erdogan value_len, is_create); 2442dec214d0STahsin Erdogan brelse(bh); 2443dec214d0STahsin Erdogan err = 0; 2444c1a5d5f6STahsin Erdogan } 2445dec214d0STahsin Erdogan 2446dec214d0STahsin Erdogan up_read(&EXT4_I(inode)->xattr_sem); 2447dec214d0STahsin Erdogan return err; 2448c1a5d5f6STahsin Erdogan } 2449c1a5d5f6STahsin Erdogan 2450ac27a0ecSDave Kleikamp /* 2451617ba13bSMingming Cao * ext4_xattr_set() 2452ac27a0ecSDave Kleikamp * 2453617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 2454ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 2455ac27a0ecSDave Kleikamp * 2456ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2457ac27a0ecSDave Kleikamp */ 2458ac27a0ecSDave Kleikamp int 2459617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 2460ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 2461ac27a0ecSDave Kleikamp { 2462ac27a0ecSDave Kleikamp handle_t *handle; 2463e50e5129SAndreas Dilger struct super_block *sb = inode->i_sb; 2464ac27a0ecSDave Kleikamp int error, retries = 0; 2465c1a5d5f6STahsin Erdogan int credits; 2466ac27a0ecSDave Kleikamp 2467b8cb5a54STahsin Erdogan error = dquot_initialize(inode); 2468b8cb5a54STahsin Erdogan if (error) 2469b8cb5a54STahsin Erdogan return error; 2470e50e5129SAndreas Dilger 2471ac27a0ecSDave Kleikamp retry: 2472af65207cSTahsin Erdogan error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, 2473af65207cSTahsin Erdogan &credits); 2474dec214d0STahsin Erdogan if (error) 2475dec214d0STahsin Erdogan return error; 2476dec214d0STahsin Erdogan 24779924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 2478ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 2479ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 2480ac27a0ecSDave Kleikamp } else { 2481ac27a0ecSDave Kleikamp int error2; 2482ac27a0ecSDave Kleikamp 2483617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 2484ac27a0ecSDave Kleikamp value, value_len, flags); 2485617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 2486ac27a0ecSDave Kleikamp if (error == -ENOSPC && 2487e50e5129SAndreas Dilger ext4_should_retry_alloc(sb, &retries)) 2488ac27a0ecSDave Kleikamp goto retry; 2489ac27a0ecSDave Kleikamp if (error == 0) 2490ac27a0ecSDave Kleikamp error = error2; 2491ac27a0ecSDave Kleikamp } 2492ac27a0ecSDave Kleikamp 2493ac27a0ecSDave Kleikamp return error; 2494ac27a0ecSDave Kleikamp } 2495ac27a0ecSDave Kleikamp 2496ac27a0ecSDave Kleikamp /* 24976dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 24986dd4ee7cSKalpak Shah * i_extra_isize. 24996dd4ee7cSKalpak Shah */ 25006dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 25016dd4ee7cSKalpak Shah int value_offs_shift, void *to, 250294405713SJan Kara void *from, size_t n) 25036dd4ee7cSKalpak Shah { 25046dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 25056dd4ee7cSKalpak Shah int new_offs; 25066dd4ee7cSKalpak Shah 250794405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 250894405713SJan Kara BUG_ON(value_offs_shift > 0); 250994405713SJan Kara 25106dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 25116dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 2512e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 25136dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 25146dd4ee7cSKalpak Shah value_offs_shift; 25156dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 25166dd4ee7cSKalpak Shah } 25176dd4ee7cSKalpak Shah } 25186dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 25196dd4ee7cSKalpak Shah memmove(to, from, n); 25206dd4ee7cSKalpak Shah } 25216dd4ee7cSKalpak Shah 25226dd4ee7cSKalpak Shah /* 25233f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 25243f2571c1SJan Kara */ 25253f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 25263f2571c1SJan Kara struct ext4_inode *raw_inode, 25273f2571c1SJan Kara struct ext4_xattr_entry *entry) 25283f2571c1SJan Kara { 25293f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 25303f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 25313f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 2532f6109100STahsin Erdogan size_t value_size = le32_to_cpu(entry->e_value_size); 25333f2571c1SJan Kara struct ext4_xattr_info i = { 25343f2571c1SJan Kara .value = NULL, 25353f2571c1SJan Kara .value_len = 0, 25363f2571c1SJan Kara .name_index = entry->e_name_index, 2537f6109100STahsin Erdogan .in_inode = !!entry->e_value_inum, 25383f2571c1SJan Kara }; 25393f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 25403f2571c1SJan Kara int error; 25413f2571c1SJan Kara 25423f2571c1SJan Kara is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 25433f2571c1SJan Kara bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 25443f2571c1SJan Kara buffer = kmalloc(value_size, GFP_NOFS); 25453f2571c1SJan Kara b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 25463f2571c1SJan Kara if (!is || !bs || !buffer || !b_entry_name) { 25473f2571c1SJan Kara error = -ENOMEM; 25483f2571c1SJan Kara goto out; 25493f2571c1SJan Kara } 25503f2571c1SJan Kara 25513f2571c1SJan Kara is->s.not_found = -ENODATA; 25523f2571c1SJan Kara bs->s.not_found = -ENODATA; 25533f2571c1SJan Kara is->iloc.bh = NULL; 25543f2571c1SJan Kara bs->bh = NULL; 25553f2571c1SJan Kara 25563f2571c1SJan Kara /* Save the entry name and the entry value */ 2557f6109100STahsin Erdogan if (entry->e_value_inum) { 2558b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, value_size); 2559f6109100STahsin Erdogan if (error) 2560f6109100STahsin Erdogan goto out; 2561f6109100STahsin Erdogan } else { 2562f6109100STahsin Erdogan size_t value_offs = le16_to_cpu(entry->e_value_offs); 25633f2571c1SJan Kara memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); 2564f6109100STahsin Erdogan } 2565f6109100STahsin Erdogan 25663f2571c1SJan Kara memcpy(b_entry_name, entry->e_name, entry->e_name_len); 25673f2571c1SJan Kara b_entry_name[entry->e_name_len] = '\0'; 25683f2571c1SJan Kara i.name = b_entry_name; 25693f2571c1SJan Kara 25703f2571c1SJan Kara error = ext4_get_inode_loc(inode, &is->iloc); 25713f2571c1SJan Kara if (error) 25723f2571c1SJan Kara goto out; 25733f2571c1SJan Kara 25743f2571c1SJan Kara error = ext4_xattr_ibody_find(inode, &i, is); 25753f2571c1SJan Kara if (error) 25763f2571c1SJan Kara goto out; 25773f2571c1SJan Kara 25783f2571c1SJan Kara /* Remove the chosen entry from the inode */ 2579e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, is); 25803f2571c1SJan Kara if (error) 25813f2571c1SJan Kara goto out; 25823f2571c1SJan Kara 25833f2571c1SJan Kara i.value = buffer; 25843f2571c1SJan Kara i.value_len = value_size; 25853f2571c1SJan Kara error = ext4_xattr_block_find(inode, &i, bs); 25863f2571c1SJan Kara if (error) 25873f2571c1SJan Kara goto out; 25883f2571c1SJan Kara 25893f2571c1SJan Kara /* Add entry which was removed from the inode into the block */ 25903f2571c1SJan Kara error = ext4_xattr_block_set(handle, inode, &i, bs); 25913f2571c1SJan Kara if (error) 25923f2571c1SJan Kara goto out; 25933f2571c1SJan Kara error = 0; 25943f2571c1SJan Kara out: 25953f2571c1SJan Kara kfree(b_entry_name); 25963f2571c1SJan Kara kfree(buffer); 25973f2571c1SJan Kara if (is) 25983f2571c1SJan Kara brelse(is->iloc.bh); 25996bdc9977SVasily Averin if (bs) 26006bdc9977SVasily Averin brelse(bs->bh); 26013f2571c1SJan Kara kfree(is); 26023f2571c1SJan Kara kfree(bs); 26033f2571c1SJan Kara 26043f2571c1SJan Kara return error; 26053f2571c1SJan Kara } 26063f2571c1SJan Kara 2607dfa2064bSJan Kara static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, 2608dfa2064bSJan Kara struct ext4_inode *raw_inode, 2609dfa2064bSJan Kara int isize_diff, size_t ifree, 2610dfa2064bSJan Kara size_t bfree, int *total_ino) 2611dfa2064bSJan Kara { 2612dfa2064bSJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 2613dfa2064bSJan Kara struct ext4_xattr_entry *small_entry; 2614dfa2064bSJan Kara struct ext4_xattr_entry *entry; 2615dfa2064bSJan Kara struct ext4_xattr_entry *last; 2616dfa2064bSJan Kara unsigned int entry_size; /* EA entry size */ 2617dfa2064bSJan Kara unsigned int total_size; /* EA entry size + value size */ 2618dfa2064bSJan Kara unsigned int min_total_size; 2619dfa2064bSJan Kara int error; 2620dfa2064bSJan Kara 2621dfa2064bSJan Kara while (isize_diff > ifree) { 2622dfa2064bSJan Kara entry = NULL; 2623dfa2064bSJan Kara small_entry = NULL; 2624dfa2064bSJan Kara min_total_size = ~0U; 2625dfa2064bSJan Kara last = IFIRST(header); 2626dfa2064bSJan Kara /* Find the entry best suited to be pushed into EA block */ 2627dfa2064bSJan Kara for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 26288cdb5240STheodore Ts'o /* never move system.data out of the inode */ 26298cdb5240STheodore Ts'o if ((last->e_name_len == 4) && 26308cdb5240STheodore Ts'o (last->e_name_index == EXT4_XATTR_INDEX_SYSTEM) && 26318cdb5240STheodore Ts'o !memcmp(last->e_name, "data", 4)) 26328cdb5240STheodore Ts'o continue; 26339bb21cedSTahsin Erdogan total_size = EXT4_XATTR_LEN(last->e_name_len); 26349bb21cedSTahsin Erdogan if (!last->e_value_inum) 26359bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 26369bb21cedSTahsin Erdogan le32_to_cpu(last->e_value_size)); 2637dfa2064bSJan Kara if (total_size <= bfree && 2638dfa2064bSJan Kara total_size < min_total_size) { 2639dfa2064bSJan Kara if (total_size + ifree < isize_diff) { 2640dfa2064bSJan Kara small_entry = last; 2641dfa2064bSJan Kara } else { 2642dfa2064bSJan Kara entry = last; 2643dfa2064bSJan Kara min_total_size = total_size; 2644dfa2064bSJan Kara } 2645dfa2064bSJan Kara } 2646dfa2064bSJan Kara } 2647dfa2064bSJan Kara 2648dfa2064bSJan Kara if (entry == NULL) { 2649dfa2064bSJan Kara if (small_entry == NULL) 2650dfa2064bSJan Kara return -ENOSPC; 2651dfa2064bSJan Kara entry = small_entry; 2652dfa2064bSJan Kara } 2653dfa2064bSJan Kara 2654dfa2064bSJan Kara entry_size = EXT4_XATTR_LEN(entry->e_name_len); 26559bb21cedSTahsin Erdogan total_size = entry_size; 26569bb21cedSTahsin Erdogan if (!entry->e_value_inum) 26579bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 26589bb21cedSTahsin Erdogan le32_to_cpu(entry->e_value_size)); 2659dfa2064bSJan Kara error = ext4_xattr_move_to_block(handle, inode, raw_inode, 2660dfa2064bSJan Kara entry); 2661dfa2064bSJan Kara if (error) 2662dfa2064bSJan Kara return error; 2663dfa2064bSJan Kara 2664dfa2064bSJan Kara *total_ino -= entry_size; 2665dfa2064bSJan Kara ifree += total_size; 2666dfa2064bSJan Kara bfree -= total_size; 2667dfa2064bSJan Kara } 2668dfa2064bSJan Kara 2669dfa2064bSJan Kara return 0; 2670dfa2064bSJan Kara } 2671dfa2064bSJan Kara 26723f2571c1SJan Kara /* 26736dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 26746dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 26756dd4ee7cSKalpak Shah */ 26766dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 26776dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 26786dd4ee7cSKalpak Shah { 26796dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 2680cf0a5e81SMiao Xie struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 2681cf0a5e81SMiao Xie static unsigned int mnt_count; 2682e3014d14SJan Kara size_t min_offs; 2683e3014d14SJan Kara size_t ifree, bfree; 26847b1b2c1bSTheodore Ts'o int total_ino; 26856e0cd088SJan Kara void *base, *end; 2686d0141191SJan Kara int error = 0, tried_min_extra_isize = 0; 2687cf0a5e81SMiao Xie int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); 2688d0141191SJan Kara int isize_diff; /* How much do we need to grow i_extra_isize */ 2689c755e251STheodore Ts'o 26906dd4ee7cSKalpak Shah retry: 2691d0141191SJan Kara isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; 26922e81a4eeSJan Kara if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) 2693b640b2c5SMiao Xie return 0; 26946dd4ee7cSKalpak Shah 26956dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 26966dd4ee7cSKalpak Shah 26976dd4ee7cSKalpak Shah /* 26986dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 26996dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 27006dd4ee7cSKalpak Shah */ 27016dd4ee7cSKalpak Shah 27026e0cd088SJan Kara base = IFIRST(header); 27036dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 27046dd4ee7cSKalpak Shah min_offs = end - base; 2705a805622aSTheodore Ts'o total_ino = sizeof(struct ext4_xattr_ibody_header) + sizeof(u32); 27066dd4ee7cSKalpak Shah 27079e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 27089e92f48cSTheodore Ts'o if (error) 27099e92f48cSTheodore Ts'o goto cleanup; 27109e92f48cSTheodore Ts'o 27116e0cd088SJan Kara ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); 2712e3014d14SJan Kara if (ifree >= isize_diff) 2713e3014d14SJan Kara goto shift; 27146dd4ee7cSKalpak Shah 27156dd4ee7cSKalpak Shah /* 27166dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 27176dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 27186dd4ee7cSKalpak Shah */ 27196dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 272053692ec0SVasily Averin struct buffer_head *bh; 272153692ec0SVasily Averin 2722fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2723fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 2724fb265c9cSTheodore Ts'o error = PTR_ERR(bh); 27256dd4ee7cSKalpak Shah goto cleanup; 2726fb265c9cSTheodore Ts'o } 2727de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 272853692ec0SVasily Averin if (error) { 272953692ec0SVasily Averin brelse(bh); 27306dd4ee7cSKalpak Shah goto cleanup; 273153692ec0SVasily Averin } 27326dd4ee7cSKalpak Shah base = BHDR(bh); 27336dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 27346dd4ee7cSKalpak Shah min_offs = end - base; 27356e0cd088SJan Kara bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, 27366e0cd088SJan Kara NULL); 2737b640b2c5SMiao Xie brelse(bh); 2738e3014d14SJan Kara if (bfree + ifree < isize_diff) { 27396dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 27406dd4ee7cSKalpak Shah tried_min_extra_isize++; 27416dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 27426dd4ee7cSKalpak Shah goto retry; 27436dd4ee7cSKalpak Shah } 2744dfa2064bSJan Kara error = -ENOSPC; 27456dd4ee7cSKalpak Shah goto cleanup; 27466dd4ee7cSKalpak Shah } 27476dd4ee7cSKalpak Shah } else { 2748e3014d14SJan Kara bfree = inode->i_sb->s_blocksize; 27496dd4ee7cSKalpak Shah } 27506dd4ee7cSKalpak Shah 2751dfa2064bSJan Kara error = ext4_xattr_make_inode_space(handle, inode, raw_inode, 2752dfa2064bSJan Kara isize_diff, ifree, bfree, 2753dfa2064bSJan Kara &total_ino); 2754dfa2064bSJan Kara if (error) { 2755dfa2064bSJan Kara if (error == -ENOSPC && !tried_min_extra_isize && 27566dd4ee7cSKalpak Shah s_min_extra_isize) { 27576dd4ee7cSKalpak Shah tried_min_extra_isize++; 27586dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 27596dd4ee7cSKalpak Shah goto retry; 27606dd4ee7cSKalpak Shah } 27616dd4ee7cSKalpak Shah goto cleanup; 27626dd4ee7cSKalpak Shah } 2763e3014d14SJan Kara shift: 2764e3014d14SJan Kara /* Adjust the offsets and shift the remaining entries ahead */ 27656e0cd088SJan Kara ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize 2766e3014d14SJan Kara - new_extra_isize, (void *)raw_inode + 2767e3014d14SJan Kara EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 276894405713SJan Kara (void *)header, total_ino); 2769e3014d14SJan Kara EXT4_I(inode)->i_extra_isize = new_extra_isize; 27706dd4ee7cSKalpak Shah 27716dd4ee7cSKalpak Shah cleanup: 2772b640b2c5SMiao Xie if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) { 2773cf0a5e81SMiao Xie ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", 2774cf0a5e81SMiao Xie inode->i_ino); 2775cf0a5e81SMiao Xie mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); 2776cf0a5e81SMiao Xie } 27776dd4ee7cSKalpak Shah return error; 27786dd4ee7cSKalpak Shah } 27796dd4ee7cSKalpak Shah 2780e50e5129SAndreas Dilger #define EIA_INCR 16 /* must be 2^n */ 2781e50e5129SAndreas Dilger #define EIA_MASK (EIA_INCR - 1) 2782dec214d0STahsin Erdogan 2783dec214d0STahsin Erdogan /* Add the large xattr @inode into @ea_inode_array for deferred iput(). 27840421a189STahsin Erdogan * If @ea_inode_array is new or full it will be grown and the old 2785e50e5129SAndreas Dilger * contents copied over. 2786e50e5129SAndreas Dilger */ 2787e50e5129SAndreas Dilger static int 27880421a189STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 27890421a189STahsin Erdogan struct inode *inode) 2790e50e5129SAndreas Dilger { 27910421a189STahsin Erdogan if (*ea_inode_array == NULL) { 2792e50e5129SAndreas Dilger /* 2793e50e5129SAndreas Dilger * Start with 15 inodes, so it fits into a power-of-two size. 27940421a189STahsin Erdogan * If *ea_inode_array is NULL, this is essentially offsetof() 2795e50e5129SAndreas Dilger */ 27960421a189STahsin Erdogan (*ea_inode_array) = 27970421a189STahsin Erdogan kmalloc(offsetof(struct ext4_xattr_inode_array, 27980421a189STahsin Erdogan inodes[EIA_MASK]), 2799e50e5129SAndreas Dilger GFP_NOFS); 28000421a189STahsin Erdogan if (*ea_inode_array == NULL) 2801e50e5129SAndreas Dilger return -ENOMEM; 28020421a189STahsin Erdogan (*ea_inode_array)->count = 0; 28030421a189STahsin Erdogan } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { 2804e50e5129SAndreas Dilger /* expand the array once all 15 + n * 16 slots are full */ 28050421a189STahsin Erdogan struct ext4_xattr_inode_array *new_array = NULL; 28060421a189STahsin Erdogan int count = (*ea_inode_array)->count; 2807e50e5129SAndreas Dilger 2808e50e5129SAndreas Dilger /* if new_array is NULL, this is essentially offsetof() */ 2809e50e5129SAndreas Dilger new_array = kmalloc( 28100421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, 28110421a189STahsin Erdogan inodes[count + EIA_INCR]), 2812e50e5129SAndreas Dilger GFP_NOFS); 2813e50e5129SAndreas Dilger if (new_array == NULL) 2814e50e5129SAndreas Dilger return -ENOMEM; 28150421a189STahsin Erdogan memcpy(new_array, *ea_inode_array, 28160421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, inodes[count])); 28170421a189STahsin Erdogan kfree(*ea_inode_array); 28180421a189STahsin Erdogan *ea_inode_array = new_array; 2819e50e5129SAndreas Dilger } 28200421a189STahsin Erdogan (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; 2821e50e5129SAndreas Dilger return 0; 2822e50e5129SAndreas Dilger } 2823e50e5129SAndreas Dilger 28246dd4ee7cSKalpak Shah /* 2825617ba13bSMingming Cao * ext4_xattr_delete_inode() 2826ac27a0ecSDave Kleikamp * 2827e50e5129SAndreas Dilger * Free extended attribute resources associated with this inode. Traverse 2828dec214d0STahsin Erdogan * all entries and decrement reference on any xattr inodes associated with this 2829dec214d0STahsin Erdogan * inode. This is called immediately before an inode is freed. We have exclusive 2830dec214d0STahsin Erdogan * access to the inode. If an orphan inode is deleted it will also release its 2831dec214d0STahsin Erdogan * references on xattr block and xattr inodes. 2832ac27a0ecSDave Kleikamp */ 2833dec214d0STahsin Erdogan int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, 283430a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 283530a7eb97STahsin Erdogan int extra_credits) 2836ac27a0ecSDave Kleikamp { 2837ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 2838e50e5129SAndreas Dilger struct ext4_xattr_ibody_header *header; 283930a7eb97STahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 2840dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 2841a6d05676STahsin Erdogan struct inode *ea_inode; 284230a7eb97STahsin Erdogan int error; 284330a7eb97STahsin Erdogan 2844a4130367SJan Kara error = ext4_journal_ensure_credits(handle, extra_credits); 2845a4130367SJan Kara if (error < 0) { 284630a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); 284730a7eb97STahsin Erdogan goto cleanup; 284830a7eb97STahsin Erdogan } 2849ac27a0ecSDave Kleikamp 2850dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2851dec214d0STahsin Erdogan ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 2852e50e5129SAndreas Dilger 2853e50e5129SAndreas Dilger error = ext4_get_inode_loc(inode, &iloc); 2854dec214d0STahsin Erdogan if (error) { 2855dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); 2856e50e5129SAndreas Dilger goto cleanup; 2857e50e5129SAndreas Dilger } 2858dec214d0STahsin Erdogan 2859dec214d0STahsin Erdogan error = ext4_journal_get_write_access(handle, iloc.bh); 2860dec214d0STahsin Erdogan if (error) { 2861dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "write access (error %d)", 2862dec214d0STahsin Erdogan error); 2863dec214d0STahsin Erdogan goto cleanup; 2864dec214d0STahsin Erdogan } 2865dec214d0STahsin Erdogan 2866dec214d0STahsin Erdogan header = IHDR(inode, ext4_raw_inode(&iloc)); 2867dec214d0STahsin Erdogan if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) 2868dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, 2869dec214d0STahsin Erdogan IFIRST(header), 2870dec214d0STahsin Erdogan false /* block_csum */, 2871dec214d0STahsin Erdogan ea_inode_array, 2872dec214d0STahsin Erdogan extra_credits, 2873dec214d0STahsin Erdogan false /* skip_quota */); 2874dec214d0STahsin Erdogan } 2875dec214d0STahsin Erdogan 2876dec214d0STahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 2877fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2878fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 2879fb265c9cSTheodore Ts'o error = PTR_ERR(bh); 2880fb265c9cSTheodore Ts'o if (error == -EIO) 288124676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 288224676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 28837159a986SDan Carpenter bh = NULL; 2884ac27a0ecSDave Kleikamp goto cleanup; 2885ac27a0ecSDave Kleikamp } 2886dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2887de05ca85STheodore Ts'o if (error) 2888ac27a0ecSDave Kleikamp goto cleanup; 2889e50e5129SAndreas Dilger 289030a7eb97STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) { 2891dec214d0STahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 2892a6d05676STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 2893a6d05676STahsin Erdogan if (!entry->e_value_inum) 2894a6d05676STahsin Erdogan continue; 2895a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, 2896a6d05676STahsin Erdogan le32_to_cpu(entry->e_value_inum), 2897a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 2898a6d05676STahsin Erdogan &ea_inode); 2899a6d05676STahsin Erdogan if (error) 2900a6d05676STahsin Erdogan continue; 2901a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, ea_inode, 2902dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 2903a6d05676STahsin Erdogan iput(ea_inode); 2904a6d05676STahsin Erdogan } 2905dec214d0STahsin Erdogan 2906e50e5129SAndreas Dilger } 2907e50e5129SAndreas Dilger 2908dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bh, ea_inode_array, 2909dec214d0STahsin Erdogan extra_credits); 2910dec214d0STahsin Erdogan /* 2911dec214d0STahsin Erdogan * Update i_file_acl value in the same transaction that releases 2912dec214d0STahsin Erdogan * block. 2913dec214d0STahsin Erdogan */ 2914617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 291530a7eb97STahsin Erdogan error = ext4_mark_inode_dirty(handle, inode); 291630a7eb97STahsin Erdogan if (error) { 291730a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", 291830a7eb97STahsin Erdogan error); 291930a7eb97STahsin Erdogan goto cleanup; 292030a7eb97STahsin Erdogan } 2921dec214d0STahsin Erdogan } 2922dec214d0STahsin Erdogan error = 0; 2923ac27a0ecSDave Kleikamp cleanup: 292430a7eb97STahsin Erdogan brelse(iloc.bh); 2925ac27a0ecSDave Kleikamp brelse(bh); 2926e50e5129SAndreas Dilger return error; 2927e50e5129SAndreas Dilger } 2928e50e5129SAndreas Dilger 29290421a189STahsin Erdogan void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) 2930e50e5129SAndreas Dilger { 2931dec214d0STahsin Erdogan int idx; 2932e50e5129SAndreas Dilger 29330421a189STahsin Erdogan if (ea_inode_array == NULL) 2934e50e5129SAndreas Dilger return; 2935e50e5129SAndreas Dilger 2936dec214d0STahsin Erdogan for (idx = 0; idx < ea_inode_array->count; ++idx) 2937dec214d0STahsin Erdogan iput(ea_inode_array->inodes[idx]); 29380421a189STahsin Erdogan kfree(ea_inode_array); 2939ac27a0ecSDave Kleikamp } 2940ac27a0ecSDave Kleikamp 2941ac27a0ecSDave Kleikamp /* 294247387409STahsin Erdogan * ext4_xattr_block_cache_insert() 2943ac27a0ecSDave Kleikamp * 294447387409STahsin Erdogan * Create a new entry in the extended attribute block cache, and insert 2945ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 2946ac27a0ecSDave Kleikamp * 2947ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2948ac27a0ecSDave Kleikamp */ 2949ac27a0ecSDave Kleikamp static void 295047387409STahsin Erdogan ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, 295147387409STahsin Erdogan struct buffer_head *bh) 2952ac27a0ecSDave Kleikamp { 29536048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 29546048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 29556048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 29566048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 2957ac27a0ecSDave Kleikamp int error; 2958ac27a0ecSDave Kleikamp 2959cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 2960cdb7ee4cSTahsin Erdogan return; 296147387409STahsin Erdogan error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, 29626048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 2963ac27a0ecSDave Kleikamp if (error) { 296482939d79SJan Kara if (error == -EBUSY) 2965ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 296682939d79SJan Kara } else 2967ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 2968ac27a0ecSDave Kleikamp } 2969ac27a0ecSDave Kleikamp 2970ac27a0ecSDave Kleikamp /* 2971617ba13bSMingming Cao * ext4_xattr_cmp() 2972ac27a0ecSDave Kleikamp * 2973ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 2974ac27a0ecSDave Kleikamp * 2975ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 2976ac27a0ecSDave Kleikamp * a negative error number on errors. 2977ac27a0ecSDave Kleikamp */ 2978ac27a0ecSDave Kleikamp static int 2979617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 2980617ba13bSMingming Cao struct ext4_xattr_header *header2) 2981ac27a0ecSDave Kleikamp { 2982617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 2983ac27a0ecSDave Kleikamp 2984ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 2985ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 2986ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 2987ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 2988ac27a0ecSDave Kleikamp return 1; 2989ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 2990ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 2991ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 2992ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 2993e50e5129SAndreas Dilger entry1->e_value_inum != entry2->e_value_inum || 2994ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 2995ac27a0ecSDave Kleikamp return 1; 29967cec1918STahsin Erdogan if (!entry1->e_value_inum && 29977cec1918STahsin Erdogan memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 2998ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 2999ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 3000ac27a0ecSDave Kleikamp return 1; 3001ac27a0ecSDave Kleikamp 3002617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 3003617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 3004ac27a0ecSDave Kleikamp } 3005ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 3006ac27a0ecSDave Kleikamp return 1; 3007ac27a0ecSDave Kleikamp return 0; 3008ac27a0ecSDave Kleikamp } 3009ac27a0ecSDave Kleikamp 3010ac27a0ecSDave Kleikamp /* 301147387409STahsin Erdogan * ext4_xattr_block_cache_find() 3012ac27a0ecSDave Kleikamp * 3013ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 3014ac27a0ecSDave Kleikamp * 3015ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 3016ac27a0ecSDave Kleikamp * not found or an error occurred. 3017ac27a0ecSDave Kleikamp */ 3018ac27a0ecSDave Kleikamp static struct buffer_head * 301947387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *inode, 302047387409STahsin Erdogan struct ext4_xattr_header *header, 30217a2508e1SJan Kara struct mb_cache_entry **pce) 3022ac27a0ecSDave Kleikamp { 3023ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 30247a2508e1SJan Kara struct mb_cache_entry *ce; 302547387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 3026ac27a0ecSDave Kleikamp 3027cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 3028cdb7ee4cSTahsin Erdogan return NULL; 3029ac27a0ecSDave Kleikamp if (!header->h_hash) 3030ac27a0ecSDave Kleikamp return NULL; /* never share */ 3031ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 303247387409STahsin Erdogan ce = mb_cache_entry_find_first(ea_block_cache, hash); 3033ac27a0ecSDave Kleikamp while (ce) { 3034ac27a0ecSDave Kleikamp struct buffer_head *bh; 3035ac27a0ecSDave Kleikamp 3036fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, ce->e_value, REQ_PRIO); 3037fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 3038fb265c9cSTheodore Ts'o if (PTR_ERR(bh) == -ENOMEM) 3039fb265c9cSTheodore Ts'o return NULL; 30407159a986SDan Carpenter bh = NULL; 304124676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 3042c07dfcb4STahsin Erdogan (unsigned long)ce->e_value); 3043617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 3044ac27a0ecSDave Kleikamp *pce = ce; 3045ac27a0ecSDave Kleikamp return bh; 3046ac27a0ecSDave Kleikamp } 3047ac27a0ecSDave Kleikamp brelse(bh); 304847387409STahsin Erdogan ce = mb_cache_entry_find_next(ea_block_cache, ce); 3049ac27a0ecSDave Kleikamp } 3050ac27a0ecSDave Kleikamp return NULL; 3051ac27a0ecSDave Kleikamp } 3052ac27a0ecSDave Kleikamp 3053ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 3054ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 3055ac27a0ecSDave Kleikamp 3056ac27a0ecSDave Kleikamp /* 3057617ba13bSMingming Cao * ext4_xattr_hash_entry() 3058ac27a0ecSDave Kleikamp * 3059ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 3060ac27a0ecSDave Kleikamp */ 3061b9fc761eSTahsin Erdogan static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, 3062b9fc761eSTahsin Erdogan size_t value_count) 3063ac27a0ecSDave Kleikamp { 3064ac27a0ecSDave Kleikamp __u32 hash = 0; 3065ac27a0ecSDave Kleikamp 3066b9fc761eSTahsin Erdogan while (name_len--) { 3067ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 3068ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 3069ac27a0ecSDave Kleikamp *name++; 3070ac27a0ecSDave Kleikamp } 3071b9fc761eSTahsin Erdogan while (value_count--) { 3072ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 3073ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 3074ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 3075ac27a0ecSDave Kleikamp } 3076b9fc761eSTahsin Erdogan return cpu_to_le32(hash); 3077ac27a0ecSDave Kleikamp } 3078ac27a0ecSDave Kleikamp 3079ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 3080ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 3081ac27a0ecSDave Kleikamp 3082ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 3083ac27a0ecSDave Kleikamp 3084ac27a0ecSDave Kleikamp /* 3085617ba13bSMingming Cao * ext4_xattr_rehash() 3086ac27a0ecSDave Kleikamp * 3087ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 3088ac27a0ecSDave Kleikamp */ 3089daf83281STahsin Erdogan static void ext4_xattr_rehash(struct ext4_xattr_header *header) 3090ac27a0ecSDave Kleikamp { 3091617ba13bSMingming Cao struct ext4_xattr_entry *here; 3092ac27a0ecSDave Kleikamp __u32 hash = 0; 3093ac27a0ecSDave Kleikamp 3094ac27a0ecSDave Kleikamp here = ENTRY(header+1); 3095ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 3096ac27a0ecSDave Kleikamp if (!here->e_hash) { 3097ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 3098ac27a0ecSDave Kleikamp hash = 0; 3099ac27a0ecSDave Kleikamp break; 3100ac27a0ecSDave Kleikamp } 3101ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 3102ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 3103ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 3104617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 3105ac27a0ecSDave Kleikamp } 3106ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 3107ac27a0ecSDave Kleikamp } 3108ac27a0ecSDave Kleikamp 3109ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 3110ac27a0ecSDave Kleikamp 31119c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 31129c191f70ST Makphaibulchoke 31137a2508e1SJan Kara struct mb_cache * 311482939d79SJan Kara ext4_xattr_create_cache(void) 3115ac27a0ecSDave Kleikamp { 31167a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 3117ac27a0ecSDave Kleikamp } 3118ac27a0ecSDave Kleikamp 31197a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 3120ac27a0ecSDave Kleikamp { 31219c191f70ST Makphaibulchoke if (cache) 31227a2508e1SJan Kara mb_cache_destroy(cache); 3123ac27a0ecSDave Kleikamp } 31249c191f70ST Makphaibulchoke 3125