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 97030a7eb97STahsin Erdogan static int ext4_xattr_ensure_credits(handle_t *handle, struct inode *inode, 97130a7eb97STahsin Erdogan int credits, struct buffer_head *bh, 97230a7eb97STahsin Erdogan bool dirty, bool block_csum) 97330a7eb97STahsin Erdogan { 97430a7eb97STahsin Erdogan int error; 97530a7eb97STahsin Erdogan 97630a7eb97STahsin Erdogan if (!ext4_handle_valid(handle)) 97730a7eb97STahsin Erdogan return 0; 97830a7eb97STahsin Erdogan 97930a7eb97STahsin Erdogan if (handle->h_buffer_credits >= credits) 98030a7eb97STahsin Erdogan return 0; 98130a7eb97STahsin Erdogan 98230a7eb97STahsin Erdogan error = ext4_journal_extend(handle, credits - handle->h_buffer_credits); 98330a7eb97STahsin Erdogan if (!error) 98430a7eb97STahsin Erdogan return 0; 98530a7eb97STahsin Erdogan if (error < 0) { 98630a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Extend journal (error %d)", error); 98730a7eb97STahsin Erdogan return error; 98830a7eb97STahsin Erdogan } 98930a7eb97STahsin Erdogan 99030a7eb97STahsin Erdogan if (bh && dirty) { 99130a7eb97STahsin Erdogan if (block_csum) 99230a7eb97STahsin Erdogan ext4_xattr_block_csum_set(inode, bh); 99330a7eb97STahsin Erdogan error = ext4_handle_dirty_metadata(handle, NULL, bh); 99430a7eb97STahsin Erdogan if (error) { 99530a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Handle metadata (error %d)", 99630a7eb97STahsin Erdogan error); 99730a7eb97STahsin Erdogan return error; 99830a7eb97STahsin Erdogan } 99930a7eb97STahsin Erdogan } 100030a7eb97STahsin Erdogan 100130a7eb97STahsin Erdogan error = ext4_journal_restart(handle, credits); 100230a7eb97STahsin Erdogan if (error) { 100330a7eb97STahsin Erdogan ext4_warning(inode->i_sb, "Restart journal (error %d)", error); 100430a7eb97STahsin Erdogan return error; 100530a7eb97STahsin Erdogan } 100630a7eb97STahsin Erdogan 100730a7eb97STahsin Erdogan if (bh) { 100830a7eb97STahsin Erdogan error = ext4_journal_get_write_access(handle, bh); 100930a7eb97STahsin Erdogan if (error) { 101030a7eb97STahsin Erdogan ext4_warning(inode->i_sb, 101130a7eb97STahsin Erdogan "Get write access failed (error %d)", 101230a7eb97STahsin Erdogan error); 101330a7eb97STahsin Erdogan return error; 101430a7eb97STahsin Erdogan } 101530a7eb97STahsin Erdogan } 101630a7eb97STahsin Erdogan return 0; 101730a7eb97STahsin Erdogan } 101830a7eb97STahsin Erdogan 1019dec214d0STahsin Erdogan static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, 1020dec214d0STahsin Erdogan int ref_change) 1021dec214d0STahsin Erdogan { 1022dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(ea_inode); 1023dec214d0STahsin Erdogan struct ext4_iloc iloc; 1024dec214d0STahsin Erdogan s64 ref_count; 1025dec214d0STahsin Erdogan u32 hash; 1026dec214d0STahsin Erdogan int ret; 1027dec214d0STahsin Erdogan 1028dec214d0STahsin Erdogan inode_lock(ea_inode); 1029dec214d0STahsin Erdogan 1030dec214d0STahsin Erdogan ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); 10311bfc204dSVasily Averin if (ret) 1032dec214d0STahsin Erdogan goto out; 1033dec214d0STahsin Erdogan 1034dec214d0STahsin Erdogan ref_count = ext4_xattr_inode_get_ref(ea_inode); 1035dec214d0STahsin Erdogan ref_count += ref_change; 1036dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, ref_count); 1037dec214d0STahsin Erdogan 1038dec214d0STahsin Erdogan if (ref_change > 0) { 1039dec214d0STahsin Erdogan WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", 1040dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1041dec214d0STahsin Erdogan 1042dec214d0STahsin Erdogan if (ref_count == 1) { 1043dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", 1044dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1045dec214d0STahsin Erdogan 1046dec214d0STahsin Erdogan set_nlink(ea_inode, 1); 1047dec214d0STahsin Erdogan ext4_orphan_del(handle, ea_inode); 1048dec214d0STahsin Erdogan 1049cdb7ee4cSTahsin Erdogan if (ea_inode_cache) { 1050dec214d0STahsin Erdogan hash = ext4_xattr_inode_get_hash(ea_inode); 1051cdb7ee4cSTahsin Erdogan mb_cache_entry_create(ea_inode_cache, 1052cdb7ee4cSTahsin Erdogan GFP_NOFS, hash, 1053dec214d0STahsin Erdogan ea_inode->i_ino, 1054dec214d0STahsin Erdogan true /* reusable */); 1055dec214d0STahsin Erdogan } 1056cdb7ee4cSTahsin Erdogan } 1057dec214d0STahsin Erdogan } else { 1058dec214d0STahsin Erdogan WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", 1059dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1060dec214d0STahsin Erdogan 1061dec214d0STahsin Erdogan if (ref_count == 0) { 1062dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink != 1, 1063dec214d0STahsin Erdogan "EA inode %lu i_nlink=%u", 1064dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1065dec214d0STahsin Erdogan 1066dec214d0STahsin Erdogan clear_nlink(ea_inode); 1067dec214d0STahsin Erdogan ext4_orphan_add(handle, ea_inode); 1068dec214d0STahsin Erdogan 1069cdb7ee4cSTahsin Erdogan if (ea_inode_cache) { 1070dec214d0STahsin Erdogan hash = ext4_xattr_inode_get_hash(ea_inode); 1071dec214d0STahsin Erdogan mb_cache_entry_delete(ea_inode_cache, hash, 1072dec214d0STahsin Erdogan ea_inode->i_ino); 1073dec214d0STahsin Erdogan } 1074dec214d0STahsin Erdogan } 1075cdb7ee4cSTahsin Erdogan } 1076dec214d0STahsin Erdogan 1077dec214d0STahsin Erdogan ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); 1078dec214d0STahsin Erdogan if (ret) 1079dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 1080dec214d0STahsin Erdogan "ext4_mark_iloc_dirty() failed ret=%d", ret); 1081dec214d0STahsin Erdogan out: 1082dec214d0STahsin Erdogan inode_unlock(ea_inode); 1083dec214d0STahsin Erdogan return ret; 1084dec214d0STahsin Erdogan } 1085dec214d0STahsin Erdogan 1086dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) 1087dec214d0STahsin Erdogan { 1088dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, 1); 1089dec214d0STahsin Erdogan } 1090dec214d0STahsin Erdogan 1091dec214d0STahsin Erdogan static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) 1092dec214d0STahsin Erdogan { 1093dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, -1); 1094dec214d0STahsin Erdogan } 1095dec214d0STahsin Erdogan 1096dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, 1097dec214d0STahsin Erdogan struct ext4_xattr_entry *first) 1098dec214d0STahsin Erdogan { 1099dec214d0STahsin Erdogan struct inode *ea_inode; 1100dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 1101dec214d0STahsin Erdogan struct ext4_xattr_entry *failed_entry; 1102dec214d0STahsin Erdogan unsigned int ea_ino; 1103dec214d0STahsin Erdogan int err, saved_err; 1104dec214d0STahsin Erdogan 1105dec214d0STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 1106dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1107dec214d0STahsin Erdogan if (!entry->e_value_inum) 1108dec214d0STahsin Erdogan continue; 1109dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1110a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1111a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1112a6d05676STahsin Erdogan &ea_inode); 1113dec214d0STahsin Erdogan if (err) 1114dec214d0STahsin Erdogan goto cleanup; 1115dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1116dec214d0STahsin Erdogan if (err) { 1117dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "inc ref error %d", err); 1118dec214d0STahsin Erdogan iput(ea_inode); 1119dec214d0STahsin Erdogan goto cleanup; 1120dec214d0STahsin Erdogan } 1121dec214d0STahsin Erdogan iput(ea_inode); 1122dec214d0STahsin Erdogan } 1123dec214d0STahsin Erdogan return 0; 1124dec214d0STahsin Erdogan 1125dec214d0STahsin Erdogan cleanup: 1126dec214d0STahsin Erdogan saved_err = err; 1127dec214d0STahsin Erdogan failed_entry = entry; 1128dec214d0STahsin Erdogan 1129dec214d0STahsin Erdogan for (entry = first; entry != failed_entry; 1130dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1131dec214d0STahsin Erdogan if (!entry->e_value_inum) 1132dec214d0STahsin Erdogan continue; 1133dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1134a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1135a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1136a6d05676STahsin Erdogan &ea_inode); 1137dec214d0STahsin Erdogan if (err) { 1138dec214d0STahsin Erdogan ext4_warning(parent->i_sb, 1139dec214d0STahsin Erdogan "cleanup ea_ino %u iget error %d", ea_ino, 1140dec214d0STahsin Erdogan err); 1141dec214d0STahsin Erdogan continue; 1142dec214d0STahsin Erdogan } 1143dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1144dec214d0STahsin Erdogan if (err) 1145dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "cleanup dec ref error %d", 1146dec214d0STahsin Erdogan err); 1147dec214d0STahsin Erdogan iput(ea_inode); 1148dec214d0STahsin Erdogan } 1149dec214d0STahsin Erdogan return saved_err; 1150dec214d0STahsin Erdogan } 1151dec214d0STahsin Erdogan 115230a7eb97STahsin Erdogan static void 1153dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, 115430a7eb97STahsin Erdogan struct buffer_head *bh, 115530a7eb97STahsin Erdogan struct ext4_xattr_entry *first, bool block_csum, 115630a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1157dec214d0STahsin Erdogan int extra_credits, bool skip_quota) 115830a7eb97STahsin Erdogan { 115930a7eb97STahsin Erdogan struct inode *ea_inode; 116030a7eb97STahsin Erdogan struct ext4_xattr_entry *entry; 116130a7eb97STahsin Erdogan bool dirty = false; 116230a7eb97STahsin Erdogan unsigned int ea_ino; 116330a7eb97STahsin Erdogan int err; 116430a7eb97STahsin Erdogan int credits; 116530a7eb97STahsin Erdogan 116630a7eb97STahsin Erdogan /* One credit for dec ref on ea_inode, one for orphan list addition, */ 116730a7eb97STahsin Erdogan credits = 2 + extra_credits; 116830a7eb97STahsin Erdogan 116930a7eb97STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 117030a7eb97STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 117130a7eb97STahsin Erdogan if (!entry->e_value_inum) 117230a7eb97STahsin Erdogan continue; 117330a7eb97STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1174a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1175a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1176a6d05676STahsin Erdogan &ea_inode); 117730a7eb97STahsin Erdogan if (err) 117830a7eb97STahsin Erdogan continue; 117930a7eb97STahsin Erdogan 118030a7eb97STahsin Erdogan err = ext4_expand_inode_array(ea_inode_array, ea_inode); 118130a7eb97STahsin Erdogan if (err) { 118230a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, 118330a7eb97STahsin Erdogan "Expand inode array err=%d", err); 118430a7eb97STahsin Erdogan iput(ea_inode); 118530a7eb97STahsin Erdogan continue; 118630a7eb97STahsin Erdogan } 118730a7eb97STahsin Erdogan 118830a7eb97STahsin Erdogan err = ext4_xattr_ensure_credits(handle, parent, credits, bh, 118930a7eb97STahsin Erdogan dirty, block_csum); 119030a7eb97STahsin Erdogan if (err) { 119130a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, "Ensure credits err=%d", 119230a7eb97STahsin Erdogan err); 119330a7eb97STahsin Erdogan continue; 119430a7eb97STahsin Erdogan } 119530a7eb97STahsin Erdogan 1196dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1197dec214d0STahsin Erdogan if (err) { 1198dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", 1199dec214d0STahsin Erdogan err); 1200dec214d0STahsin Erdogan continue; 1201dec214d0STahsin Erdogan } 1202dec214d0STahsin Erdogan 1203dec214d0STahsin Erdogan if (!skip_quota) 1204a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(parent, ea_inode, 1205dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 120630a7eb97STahsin Erdogan 120730a7eb97STahsin Erdogan /* 120830a7eb97STahsin Erdogan * Forget about ea_inode within the same transaction that 120930a7eb97STahsin Erdogan * decrements the ref count. This avoids duplicate decrements in 121030a7eb97STahsin Erdogan * case the rest of the work spills over to subsequent 121130a7eb97STahsin Erdogan * transactions. 121230a7eb97STahsin Erdogan */ 121330a7eb97STahsin Erdogan entry->e_value_inum = 0; 121430a7eb97STahsin Erdogan entry->e_value_size = 0; 121530a7eb97STahsin Erdogan 121630a7eb97STahsin Erdogan dirty = true; 121730a7eb97STahsin Erdogan } 121830a7eb97STahsin Erdogan 121930a7eb97STahsin Erdogan if (dirty) { 122030a7eb97STahsin Erdogan /* 122130a7eb97STahsin Erdogan * Note that we are deliberately skipping csum calculation for 122230a7eb97STahsin Erdogan * the final update because we do not expect any journal 122330a7eb97STahsin Erdogan * restarts until xattr block is freed. 122430a7eb97STahsin Erdogan */ 122530a7eb97STahsin Erdogan 122630a7eb97STahsin Erdogan err = ext4_handle_dirty_metadata(handle, NULL, bh); 122730a7eb97STahsin Erdogan if (err) 122830a7eb97STahsin Erdogan ext4_warning_inode(parent, 122930a7eb97STahsin Erdogan "handle dirty metadata err=%d", err); 123030a7eb97STahsin Erdogan } 123130a7eb97STahsin Erdogan } 123230a7eb97STahsin Erdogan 1233ac27a0ecSDave Kleikamp /* 1234ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 1235ec4cb1aaSJan Kara * otherwise free the block. 1236ac27a0ecSDave Kleikamp */ 1237ac27a0ecSDave Kleikamp static void 1238617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 1239dec214d0STahsin Erdogan struct buffer_head *bh, 1240dec214d0STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1241dec214d0STahsin Erdogan int extra_credits) 1242ac27a0ecSDave Kleikamp { 124347387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 12446048c64bSAndreas Gruenbacher u32 hash, ref; 12458a2bfdcbSMingming Cao int error = 0; 1246ac27a0ecSDave Kleikamp 12475d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 12488a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bh); 12498a2bfdcbSMingming Cao if (error) 12508a2bfdcbSMingming Cao goto out; 12518a2bfdcbSMingming Cao 12528a2bfdcbSMingming Cao lock_buffer(bh); 12536048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 12546048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 12556048c64bSAndreas Gruenbacher if (ref == 1) { 1256ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 125782939d79SJan Kara /* 125882939d79SJan Kara * This must happen under buffer lock for 125982939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 126082939d79SJan Kara */ 1261cdb7ee4cSTahsin Erdogan if (ea_block_cache) 1262cdb7ee4cSTahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, 1263cdb7ee4cSTahsin Erdogan bh->b_blocknr); 1264ac27a0ecSDave Kleikamp get_bh(bh); 1265ec4cb1aaSJan Kara unlock_buffer(bh); 1266dec214d0STahsin Erdogan 1267dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) 1268dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, bh, 1269dec214d0STahsin Erdogan BFIRST(bh), 1270dec214d0STahsin Erdogan true /* block_csum */, 1271dec214d0STahsin Erdogan ea_inode_array, 1272dec214d0STahsin Erdogan extra_credits, 1273dec214d0STahsin Erdogan true /* skip_quota */); 1274e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 1275e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 1276e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 1277ac27a0ecSDave Kleikamp } else { 12786048c64bSAndreas Gruenbacher ref--; 12796048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 12806048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 12816048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 12826048c64bSAndreas Gruenbacher 1283cdb7ee4cSTahsin Erdogan if (ea_block_cache) { 128447387409STahsin Erdogan ce = mb_cache_entry_get(ea_block_cache, hash, 12856048c64bSAndreas Gruenbacher bh->b_blocknr); 12866048c64bSAndreas Gruenbacher if (ce) { 12876048c64bSAndreas Gruenbacher ce->e_reusable = 1; 128847387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 12896048c64bSAndreas Gruenbacher } 12906048c64bSAndreas Gruenbacher } 1291cdb7ee4cSTahsin Erdogan } 12926048c64bSAndreas Gruenbacher 1293dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bh); 1294ec4cb1aaSJan Kara /* 1295ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 1296ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 1297ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 1298ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 1299ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 1300dac7a4b4STheodore Ts'o * call ext4_handle_dirty_metadata() with locked buffer as 1301ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 1302ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 1303ec4cb1aaSJan Kara */ 1304ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 1305dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1306c1bb05a6SEric Sandeen unlock_buffer(bh); 1307ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 1308dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1309ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 13100390131bSFrank Mayhar ext4_handle_sync(handle); 13111231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 1312ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 1313ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 1314ac27a0ecSDave Kleikamp } 13158a2bfdcbSMingming Cao out: 13168a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 13178a2bfdcbSMingming Cao return; 1318ac27a0ecSDave Kleikamp } 1319ac27a0ecSDave Kleikamp 13206dd4ee7cSKalpak Shah /* 13216dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 13226dd4ee7cSKalpak Shah * bytes used by EA entries. 13236dd4ee7cSKalpak Shah */ 13246dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 13256dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 13266dd4ee7cSKalpak Shah { 13276dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1328e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 13296dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 13306dd4ee7cSKalpak Shah if (offs < *min_offs) 13316dd4ee7cSKalpak Shah *min_offs = offs; 13326dd4ee7cSKalpak Shah } 13337b1b2c1bSTheodore Ts'o if (total) 13347b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 13356dd4ee7cSKalpak Shah } 13366dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 13376dd4ee7cSKalpak Shah } 13386dd4ee7cSKalpak Shah 1339e50e5129SAndreas Dilger /* 1340e50e5129SAndreas Dilger * Write the value of the EA in an inode. 1341e50e5129SAndreas Dilger */ 1342e50e5129SAndreas Dilger static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, 1343e50e5129SAndreas Dilger const void *buf, int bufsize) 1344e50e5129SAndreas Dilger { 1345e50e5129SAndreas Dilger struct buffer_head *bh = NULL; 1346e50e5129SAndreas Dilger unsigned long block = 0; 1347dec214d0STahsin Erdogan int blocksize = ea_inode->i_sb->s_blocksize; 1348dec214d0STahsin Erdogan int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; 1349e50e5129SAndreas Dilger int csize, wsize = 0; 1350e50e5129SAndreas Dilger int ret = 0; 1351e50e5129SAndreas Dilger int retries = 0; 1352e50e5129SAndreas Dilger 1353e50e5129SAndreas Dilger retry: 1354e50e5129SAndreas Dilger while (ret >= 0 && ret < max_blocks) { 1355e50e5129SAndreas Dilger struct ext4_map_blocks map; 1356e50e5129SAndreas Dilger map.m_lblk = block += ret; 1357e50e5129SAndreas Dilger map.m_len = max_blocks -= ret; 1358e50e5129SAndreas Dilger 1359e50e5129SAndreas Dilger ret = ext4_map_blocks(handle, ea_inode, &map, 1360e50e5129SAndreas Dilger EXT4_GET_BLOCKS_CREATE); 1361e50e5129SAndreas Dilger if (ret <= 0) { 1362e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1363e50e5129SAndreas Dilger if (ret == -ENOSPC && 1364e50e5129SAndreas Dilger ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { 1365e50e5129SAndreas Dilger ret = 0; 1366e50e5129SAndreas Dilger goto retry; 1367e50e5129SAndreas Dilger } 1368e50e5129SAndreas Dilger break; 1369e50e5129SAndreas Dilger } 1370e50e5129SAndreas Dilger } 1371e50e5129SAndreas Dilger 1372e50e5129SAndreas Dilger if (ret < 0) 1373e50e5129SAndreas Dilger return ret; 1374e50e5129SAndreas Dilger 1375e50e5129SAndreas Dilger block = 0; 1376e50e5129SAndreas Dilger while (wsize < bufsize) { 1377e50e5129SAndreas Dilger if (bh != NULL) 1378e50e5129SAndreas Dilger brelse(bh); 1379e50e5129SAndreas Dilger csize = (bufsize - wsize) > blocksize ? blocksize : 1380e50e5129SAndreas Dilger bufsize - wsize; 1381e50e5129SAndreas Dilger bh = ext4_getblk(handle, ea_inode, block, 0); 1382e50e5129SAndreas Dilger if (IS_ERR(bh)) 1383e50e5129SAndreas Dilger return PTR_ERR(bh); 1384eb6984faSVasily Averin if (!bh) { 1385eb6984faSVasily Averin WARN_ON_ONCE(1); 1386eb6984faSVasily Averin EXT4_ERROR_INODE(ea_inode, 1387eb6984faSVasily Averin "ext4_getblk() return bh = NULL"); 1388eb6984faSVasily Averin return -EFSCORRUPTED; 1389eb6984faSVasily Averin } 1390e50e5129SAndreas Dilger ret = ext4_journal_get_write_access(handle, bh); 1391e50e5129SAndreas Dilger if (ret) 1392e50e5129SAndreas Dilger goto out; 1393e50e5129SAndreas Dilger 1394e50e5129SAndreas Dilger memcpy(bh->b_data, buf, csize); 1395e50e5129SAndreas Dilger set_buffer_uptodate(bh); 1396e50e5129SAndreas Dilger ext4_handle_dirty_metadata(handle, ea_inode, bh); 1397e50e5129SAndreas Dilger 1398e50e5129SAndreas Dilger buf += csize; 1399e50e5129SAndreas Dilger wsize += csize; 1400e50e5129SAndreas Dilger block += 1; 1401e50e5129SAndreas Dilger } 1402e50e5129SAndreas Dilger 1403e50e5129SAndreas Dilger inode_lock(ea_inode); 1404e50e5129SAndreas Dilger i_size_write(ea_inode, wsize); 1405e50e5129SAndreas Dilger ext4_update_i_disksize(ea_inode, wsize); 1406e50e5129SAndreas Dilger inode_unlock(ea_inode); 1407e50e5129SAndreas Dilger 1408e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1409e50e5129SAndreas Dilger 1410e50e5129SAndreas Dilger out: 1411e50e5129SAndreas Dilger brelse(bh); 1412e50e5129SAndreas Dilger 1413e50e5129SAndreas Dilger return ret; 1414e50e5129SAndreas Dilger } 1415e50e5129SAndreas Dilger 1416e50e5129SAndreas Dilger /* 1417e50e5129SAndreas Dilger * Create an inode to store the value of a large EA. 1418e50e5129SAndreas Dilger */ 1419e50e5129SAndreas Dilger static struct inode *ext4_xattr_inode_create(handle_t *handle, 1420dec214d0STahsin Erdogan struct inode *inode, u32 hash) 1421e50e5129SAndreas Dilger { 1422e50e5129SAndreas Dilger struct inode *ea_inode = NULL; 14239e1ba001STahsin Erdogan uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; 1424bd3b963bSTahsin Erdogan int err; 1425e50e5129SAndreas Dilger 1426e50e5129SAndreas Dilger /* 1427e50e5129SAndreas Dilger * Let the next inode be the goal, so we try and allocate the EA inode 1428e50e5129SAndreas Dilger * in the same group, or nearby one. 1429e50e5129SAndreas Dilger */ 1430e50e5129SAndreas Dilger ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, 14319e1ba001STahsin Erdogan S_IFREG | 0600, NULL, inode->i_ino + 1, owner, 14321b917ed8STahsin Erdogan EXT4_EA_INODE_FL); 1433e50e5129SAndreas Dilger if (!IS_ERR(ea_inode)) { 1434e50e5129SAndreas Dilger ea_inode->i_op = &ext4_file_inode_operations; 1435e50e5129SAndreas Dilger ea_inode->i_fop = &ext4_file_operations; 1436e50e5129SAndreas Dilger ext4_set_aops(ea_inode); 143733d201e0STahsin Erdogan ext4_xattr_inode_set_class(ea_inode); 1438e50e5129SAndreas Dilger unlock_new_inode(ea_inode); 1439dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, 1); 1440dec214d0STahsin Erdogan ext4_xattr_inode_set_hash(ea_inode, hash); 1441dec214d0STahsin Erdogan err = ext4_mark_inode_dirty(handle, ea_inode); 1442dec214d0STahsin Erdogan if (!err) 1443bd3b963bSTahsin Erdogan err = ext4_inode_attach_jinode(ea_inode); 1444bd3b963bSTahsin Erdogan if (err) { 1445bd3b963bSTahsin Erdogan iput(ea_inode); 1446bd3b963bSTahsin Erdogan return ERR_PTR(err); 1447bd3b963bSTahsin Erdogan } 1448dec214d0STahsin Erdogan 1449dec214d0STahsin Erdogan /* 1450dec214d0STahsin Erdogan * Xattr inodes are shared therefore quota charging is performed 1451dec214d0STahsin Erdogan * at a higher level. 1452dec214d0STahsin Erdogan */ 1453dec214d0STahsin Erdogan dquot_free_inode(ea_inode); 1454dec214d0STahsin Erdogan dquot_drop(ea_inode); 1455dec214d0STahsin Erdogan inode_lock(ea_inode); 1456dec214d0STahsin Erdogan ea_inode->i_flags |= S_NOQUOTA; 1457dec214d0STahsin Erdogan inode_unlock(ea_inode); 1458e50e5129SAndreas Dilger } 1459e50e5129SAndreas Dilger 1460e50e5129SAndreas Dilger return ea_inode; 1461e50e5129SAndreas Dilger } 1462e50e5129SAndreas Dilger 1463dec214d0STahsin Erdogan static struct inode * 1464dec214d0STahsin Erdogan ext4_xattr_inode_cache_find(struct inode *inode, const void *value, 1465dec214d0STahsin Erdogan size_t value_len, u32 hash) 1466e50e5129SAndreas Dilger { 1467dec214d0STahsin Erdogan struct inode *ea_inode; 1468dec214d0STahsin Erdogan struct mb_cache_entry *ce; 1469dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 1470dec214d0STahsin Erdogan void *ea_data; 1471e50e5129SAndreas Dilger 1472cdb7ee4cSTahsin Erdogan if (!ea_inode_cache) 1473cdb7ee4cSTahsin Erdogan return NULL; 1474cdb7ee4cSTahsin Erdogan 1475dec214d0STahsin Erdogan ce = mb_cache_entry_find_first(ea_inode_cache, hash); 1476dec214d0STahsin Erdogan if (!ce) 1477dec214d0STahsin Erdogan return NULL; 1478e50e5129SAndreas Dilger 1479dec214d0STahsin Erdogan ea_data = ext4_kvmalloc(value_len, GFP_NOFS); 1480dec214d0STahsin Erdogan if (!ea_data) { 1481dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1482dec214d0STahsin Erdogan return NULL; 1483dec214d0STahsin Erdogan } 1484dec214d0STahsin Erdogan 1485dec214d0STahsin Erdogan while (ce) { 14868a363970STheodore Ts'o ea_inode = ext4_iget(inode->i_sb, ce->e_value, 14878a363970STheodore Ts'o EXT4_IGET_NORMAL); 1488dec214d0STahsin Erdogan if (!IS_ERR(ea_inode) && 1489dec214d0STahsin Erdogan !is_bad_inode(ea_inode) && 1490dec214d0STahsin Erdogan (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && 1491dec214d0STahsin Erdogan i_size_read(ea_inode) == value_len && 1492dec214d0STahsin Erdogan !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && 1493b9fc761eSTahsin Erdogan !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, 1494dec214d0STahsin Erdogan value_len) && 1495dec214d0STahsin Erdogan !memcmp(value, ea_data, value_len)) { 1496dec214d0STahsin Erdogan mb_cache_entry_touch(ea_inode_cache, ce); 1497dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1498dec214d0STahsin Erdogan kvfree(ea_data); 1499dec214d0STahsin Erdogan return ea_inode; 1500dec214d0STahsin Erdogan } 1501dec214d0STahsin Erdogan 1502dec214d0STahsin Erdogan if (!IS_ERR(ea_inode)) 1503e50e5129SAndreas Dilger iput(ea_inode); 1504dec214d0STahsin Erdogan ce = mb_cache_entry_find_next(ea_inode_cache, ce); 1505dec214d0STahsin Erdogan } 1506dec214d0STahsin Erdogan kvfree(ea_data); 1507dec214d0STahsin Erdogan return NULL; 1508e50e5129SAndreas Dilger } 1509e50e5129SAndreas Dilger 1510e50e5129SAndreas Dilger /* 1511e50e5129SAndreas Dilger * Add value of the EA in an inode. 1512e50e5129SAndreas Dilger */ 1513dec214d0STahsin Erdogan static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, 1514dec214d0STahsin Erdogan const void *value, size_t value_len, 1515dec214d0STahsin Erdogan struct inode **ret_inode) 1516e50e5129SAndreas Dilger { 1517e50e5129SAndreas Dilger struct inode *ea_inode; 1518dec214d0STahsin Erdogan u32 hash; 1519e50e5129SAndreas Dilger int err; 1520e50e5129SAndreas Dilger 1521dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); 1522dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); 1523dec214d0STahsin Erdogan if (ea_inode) { 1524dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1525dec214d0STahsin Erdogan if (err) { 1526dec214d0STahsin Erdogan iput(ea_inode); 1527dec214d0STahsin Erdogan return err; 1528dec214d0STahsin Erdogan } 1529dec214d0STahsin Erdogan 1530dec214d0STahsin Erdogan *ret_inode = ea_inode; 1531dec214d0STahsin Erdogan return 0; 1532dec214d0STahsin Erdogan } 1533dec214d0STahsin Erdogan 1534e50e5129SAndreas Dilger /* Create an inode for the EA value */ 1535dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_create(handle, inode, hash); 1536e50e5129SAndreas Dilger if (IS_ERR(ea_inode)) 1537e50e5129SAndreas Dilger return PTR_ERR(ea_inode); 1538e50e5129SAndreas Dilger 1539e50e5129SAndreas Dilger err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); 1540dec214d0STahsin Erdogan if (err) { 1541dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref(handle, ea_inode); 1542e50e5129SAndreas Dilger iput(ea_inode); 1543e50e5129SAndreas Dilger return err; 1544e50e5129SAndreas Dilger } 1545e50e5129SAndreas Dilger 1546cdb7ee4cSTahsin Erdogan if (EA_INODE_CACHE(inode)) 1547dec214d0STahsin Erdogan mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, 1548dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 1549dec214d0STahsin Erdogan 1550dec214d0STahsin Erdogan *ret_inode = ea_inode; 1551dec214d0STahsin Erdogan return 0; 1552dec214d0STahsin Erdogan } 1553dec214d0STahsin Erdogan 15549c6e7853STahsin Erdogan /* 15559c6e7853STahsin Erdogan * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode 15569c6e7853STahsin Erdogan * feature is enabled. 15579c6e7853STahsin Erdogan */ 15589c6e7853STahsin Erdogan #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) 15599c6e7853STahsin Erdogan 1560e50e5129SAndreas Dilger static int ext4_xattr_set_entry(struct ext4_xattr_info *i, 1561e50e5129SAndreas Dilger struct ext4_xattr_search *s, 1562daf83281STahsin Erdogan handle_t *handle, struct inode *inode, 1563daf83281STahsin Erdogan bool is_block) 1564ac27a0ecSDave Kleikamp { 15655369a762STheodore Ts'o struct ext4_xattr_entry *last, *next; 1566dec214d0STahsin Erdogan struct ext4_xattr_entry *here = s->here; 1567dec214d0STahsin Erdogan size_t min_offs = s->end - s->base, name_len = strlen(i->name); 1568e50e5129SAndreas Dilger int in_inode = i->in_inode; 1569dec214d0STahsin Erdogan struct inode *old_ea_inode = NULL; 1570dec214d0STahsin Erdogan struct inode *new_ea_inode = NULL; 1571dec214d0STahsin Erdogan size_t old_size, new_size; 1572dec214d0STahsin Erdogan int ret; 1573dec214d0STahsin Erdogan 1574dec214d0STahsin Erdogan /* Space used by old and new values. */ 1575dec214d0STahsin Erdogan old_size = (!s->not_found && !here->e_value_inum) ? 1576dec214d0STahsin Erdogan EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; 1577dec214d0STahsin Erdogan new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; 1578dec214d0STahsin Erdogan 1579dec214d0STahsin Erdogan /* 1580dec214d0STahsin Erdogan * Optimization for the simple case when old and new values have the 1581dec214d0STahsin Erdogan * same padded sizes. Not applicable if external inodes are involved. 1582dec214d0STahsin Erdogan */ 1583dec214d0STahsin Erdogan if (new_size && new_size == old_size) { 1584dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1585dec214d0STahsin Erdogan void *val = s->base + offs; 1586dec214d0STahsin Erdogan 1587dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1588dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1589dec214d0STahsin Erdogan memset(val, 0, new_size); 1590dec214d0STahsin Erdogan } else { 1591dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1592dec214d0STahsin Erdogan /* Clear padding bytes. */ 1593dec214d0STahsin Erdogan memset(val + i->value_len, 0, new_size - i->value_len); 1594dec214d0STahsin Erdogan } 159532aaf194STahsin Erdogan goto update_hash; 1596dec214d0STahsin Erdogan } 1597e50e5129SAndreas Dilger 1598ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 1599ac27a0ecSDave Kleikamp last = s->first; 16005369a762STheodore Ts'o for (; !IS_LAST_ENTRY(last); last = next) { 16015369a762STheodore Ts'o next = EXT4_XATTR_NEXT(last); 16025369a762STheodore Ts'o if ((void *)next >= s->end) { 16035369a762STheodore Ts'o EXT4_ERROR_INODE(inode, "corrupted xattr entries"); 16045369a762STheodore Ts'o ret = -EFSCORRUPTED; 16055369a762STheodore Ts'o goto out; 16065369a762STheodore Ts'o } 1607e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 1608ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 1609ac27a0ecSDave Kleikamp if (offs < min_offs) 1610ac27a0ecSDave Kleikamp min_offs = offs; 1611ac27a0ecSDave Kleikamp } 1612ac27a0ecSDave Kleikamp } 1613dec214d0STahsin Erdogan 1614dec214d0STahsin Erdogan /* Check whether we have enough space. */ 1615ac27a0ecSDave Kleikamp if (i->value) { 1616dec214d0STahsin Erdogan size_t free; 1617e50e5129SAndreas Dilger 1618dec214d0STahsin Erdogan free = min_offs - ((void *)last - s->base) - sizeof(__u32); 1619dec214d0STahsin Erdogan if (!s->not_found) 1620dec214d0STahsin Erdogan free += EXT4_XATTR_LEN(name_len) + old_size; 1621e50e5129SAndreas Dilger 1622dec214d0STahsin Erdogan if (free < EXT4_XATTR_LEN(name_len) + new_size) { 1623dec214d0STahsin Erdogan ret = -ENOSPC; 1624dec214d0STahsin Erdogan goto out; 1625dec214d0STahsin Erdogan } 16269c6e7853STahsin Erdogan 16279c6e7853STahsin Erdogan /* 16289c6e7853STahsin Erdogan * If storing the value in an external inode is an option, 16299c6e7853STahsin Erdogan * reserve space for xattr entries/names in the external 16309c6e7853STahsin Erdogan * attribute block so that a long value does not occupy the 16319c6e7853STahsin Erdogan * whole space and prevent futher entries being added. 16329c6e7853STahsin Erdogan */ 1633daf83281STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 1634daf83281STahsin Erdogan new_size && is_block && 16359c6e7853STahsin Erdogan (min_offs + old_size - new_size) < 16369c6e7853STahsin Erdogan EXT4_XATTR_BLOCK_RESERVE(inode)) { 16379c6e7853STahsin Erdogan ret = -ENOSPC; 16389c6e7853STahsin Erdogan goto out; 16399c6e7853STahsin Erdogan } 1640ac27a0ecSDave Kleikamp } 1641ac27a0ecSDave Kleikamp 1642dec214d0STahsin Erdogan /* 1643dec214d0STahsin Erdogan * Getting access to old and new ea inodes is subject to failures. 1644dec214d0STahsin Erdogan * Finish that work before doing any modifications to the xattr data. 1645dec214d0STahsin Erdogan */ 1646dec214d0STahsin Erdogan if (!s->not_found && here->e_value_inum) { 1647dec214d0STahsin Erdogan ret = ext4_xattr_inode_iget(inode, 1648dec214d0STahsin Erdogan le32_to_cpu(here->e_value_inum), 1649a6d05676STahsin Erdogan le32_to_cpu(here->e_hash), 1650dec214d0STahsin Erdogan &old_ea_inode); 1651dec214d0STahsin Erdogan if (ret) { 1652dec214d0STahsin Erdogan old_ea_inode = NULL; 1653dec214d0STahsin Erdogan goto out; 1654bd9926e8STheodore Ts'o } 1655dec214d0STahsin Erdogan } 1656dec214d0STahsin Erdogan if (i->value && in_inode) { 1657dec214d0STahsin Erdogan WARN_ON_ONCE(!i->value_len); 1658dec214d0STahsin Erdogan 1659dec214d0STahsin Erdogan ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); 1660dec214d0STahsin Erdogan if (ret) 1661dec214d0STahsin Erdogan goto out; 1662dec214d0STahsin Erdogan 1663dec214d0STahsin Erdogan ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, 1664dec214d0STahsin Erdogan i->value_len, 1665dec214d0STahsin Erdogan &new_ea_inode); 1666dec214d0STahsin Erdogan if (ret) { 1667dec214d0STahsin Erdogan new_ea_inode = NULL; 1668a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, NULL, i->value_len); 1669dec214d0STahsin Erdogan goto out; 1670dec214d0STahsin Erdogan } 1671ac27a0ecSDave Kleikamp } 1672ac27a0ecSDave Kleikamp 1673dec214d0STahsin Erdogan if (old_ea_inode) { 1674dec214d0STahsin Erdogan /* We are ready to release ref count on the old_ea_inode. */ 1675dec214d0STahsin Erdogan ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); 1676dec214d0STahsin Erdogan if (ret) { 1677dec214d0STahsin Erdogan /* Release newly required ref count on new_ea_inode. */ 1678dec214d0STahsin Erdogan if (new_ea_inode) { 1679dec214d0STahsin Erdogan int err; 1680dec214d0STahsin Erdogan 1681dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, 1682dec214d0STahsin Erdogan new_ea_inode); 1683dec214d0STahsin Erdogan if (err) 1684dec214d0STahsin Erdogan ext4_warning_inode(new_ea_inode, 1685dec214d0STahsin Erdogan "dec ref new_ea_inode err=%d", 1686dec214d0STahsin Erdogan err); 1687a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, new_ea_inode, 1688dec214d0STahsin Erdogan i->value_len); 1689dec214d0STahsin Erdogan } 1690dec214d0STahsin Erdogan goto out; 1691dec214d0STahsin Erdogan } 1692dec214d0STahsin Erdogan 1693a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, old_ea_inode, 1694dec214d0STahsin Erdogan le32_to_cpu(here->e_value_size)); 1695dec214d0STahsin Erdogan } 1696dec214d0STahsin Erdogan 1697dec214d0STahsin Erdogan /* No failures allowed past this point. */ 1698dec214d0STahsin Erdogan 1699*e5d01196STheodore Ts'o if (!s->not_found && here->e_value_size && !here->e_value_inum) { 1700ac27a0ecSDave Kleikamp /* Remove the old value. */ 1701dec214d0STahsin Erdogan void *first_val = s->base + min_offs; 1702dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1703dec214d0STahsin Erdogan void *val = s->base + offs; 1704dec214d0STahsin Erdogan 1705dec214d0STahsin Erdogan memmove(first_val + old_size, first_val, val - first_val); 1706dec214d0STahsin Erdogan memset(first_val, 0, old_size); 1707dec214d0STahsin Erdogan min_offs += old_size; 1708ac27a0ecSDave Kleikamp 1709ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 1710ac27a0ecSDave Kleikamp last = s->first; 1711ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 1712ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 1713dec214d0STahsin Erdogan 1714e50e5129SAndreas Dilger if (!last->e_value_inum && 1715e50e5129SAndreas Dilger last->e_value_size && o < offs) 1716dec214d0STahsin Erdogan last->e_value_offs = cpu_to_le16(o + old_size); 1717617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 1718ac27a0ecSDave Kleikamp } 1719ac27a0ecSDave Kleikamp } 1720dec214d0STahsin Erdogan 1721ac27a0ecSDave Kleikamp if (!i->value) { 1722dec214d0STahsin Erdogan /* Remove old name. */ 1723617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 1724dec214d0STahsin Erdogan 1725ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 1726dec214d0STahsin Erdogan memmove(here, (void *)here + size, 1727dec214d0STahsin Erdogan (void *)last - (void *)here + sizeof(__u32)); 1728ac27a0ecSDave Kleikamp memset(last, 0, size); 1729dec214d0STahsin Erdogan } else if (s->not_found) { 1730dec214d0STahsin Erdogan /* Insert new name. */ 1731dec214d0STahsin Erdogan size_t size = EXT4_XATTR_LEN(name_len); 1732dec214d0STahsin Erdogan size_t rest = (void *)last - (void *)here + sizeof(__u32); 1733dec214d0STahsin Erdogan 1734dec214d0STahsin Erdogan memmove((void *)here + size, here, rest); 1735dec214d0STahsin Erdogan memset(here, 0, size); 1736dec214d0STahsin Erdogan here->e_name_index = i->name_index; 1737dec214d0STahsin Erdogan here->e_name_len = name_len; 1738dec214d0STahsin Erdogan memcpy(here->e_name, i->name, name_len); 1739dec214d0STahsin Erdogan } else { 1740dec214d0STahsin Erdogan /* This is an update, reset value info. */ 1741dec214d0STahsin Erdogan here->e_value_inum = 0; 1742dec214d0STahsin Erdogan here->e_value_offs = 0; 1743dec214d0STahsin Erdogan here->e_value_size = 0; 1744ac27a0ecSDave Kleikamp } 1745ac27a0ecSDave Kleikamp 1746ac27a0ecSDave Kleikamp if (i->value) { 1747dec214d0STahsin Erdogan /* Insert new value. */ 1748e50e5129SAndreas Dilger if (in_inode) { 1749dec214d0STahsin Erdogan here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); 1750e50e5129SAndreas Dilger } else if (i->value_len) { 1751dec214d0STahsin Erdogan void *val = s->base + min_offs - new_size; 1752e50e5129SAndreas Dilger 1753dec214d0STahsin Erdogan here->e_value_offs = cpu_to_le16(min_offs - new_size); 1754dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1755dec214d0STahsin Erdogan memset(val, 0, new_size); 1756dec214d0STahsin Erdogan } else { 1757dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1758dec214d0STahsin Erdogan /* Clear padding bytes. */ 1759dec214d0STahsin Erdogan memset(val + i->value_len, 0, 1760dec214d0STahsin Erdogan new_size - i->value_len); 1761dec214d0STahsin Erdogan } 1762dec214d0STahsin Erdogan } 1763dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1764dec214d0STahsin Erdogan } 1765daf83281STahsin Erdogan 176632aaf194STahsin Erdogan update_hash: 1767b9fc761eSTahsin Erdogan if (i->value) { 1768b9fc761eSTahsin Erdogan __le32 hash = 0; 1769b9fc761eSTahsin Erdogan 1770b9fc761eSTahsin Erdogan /* Entry hash calculation. */ 1771b9fc761eSTahsin Erdogan if (in_inode) { 1772b9fc761eSTahsin Erdogan __le32 crc32c_hash; 1773b9fc761eSTahsin Erdogan 1774b9fc761eSTahsin Erdogan /* 1775b9fc761eSTahsin Erdogan * Feed crc32c hash instead of the raw value for entry 1776b9fc761eSTahsin Erdogan * hash calculation. This is to avoid walking 1777b9fc761eSTahsin Erdogan * potentially long value buffer again. 1778b9fc761eSTahsin Erdogan */ 1779b9fc761eSTahsin Erdogan crc32c_hash = cpu_to_le32( 1780b9fc761eSTahsin Erdogan ext4_xattr_inode_get_hash(new_ea_inode)); 1781b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1782b9fc761eSTahsin Erdogan here->e_name_len, 1783b9fc761eSTahsin Erdogan &crc32c_hash, 1); 1784b9fc761eSTahsin Erdogan } else if (is_block) { 178532aaf194STahsin Erdogan __le32 *value = s->base + le16_to_cpu( 178632aaf194STahsin Erdogan here->e_value_offs); 1787b9fc761eSTahsin Erdogan 1788b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1789b9fc761eSTahsin Erdogan here->e_name_len, value, 1790b9fc761eSTahsin Erdogan new_size >> 2); 1791daf83281STahsin Erdogan } 1792b9fc761eSTahsin Erdogan here->e_hash = hash; 1793b9fc761eSTahsin Erdogan } 1794b9fc761eSTahsin Erdogan 1795b9fc761eSTahsin Erdogan if (is_block) 1796b9fc761eSTahsin Erdogan ext4_xattr_rehash((struct ext4_xattr_header *)s->base); 1797daf83281STahsin Erdogan 1798dec214d0STahsin Erdogan ret = 0; 1799e50e5129SAndreas Dilger out: 1800dec214d0STahsin Erdogan iput(old_ea_inode); 1801dec214d0STahsin Erdogan iput(new_ea_inode); 1802dec214d0STahsin Erdogan return ret; 1803ac27a0ecSDave Kleikamp } 1804ac27a0ecSDave Kleikamp 1805617ba13bSMingming Cao struct ext4_xattr_block_find { 1806617ba13bSMingming Cao struct ext4_xattr_search s; 1807ac27a0ecSDave Kleikamp struct buffer_head *bh; 1808ac27a0ecSDave Kleikamp }; 1809ac27a0ecSDave Kleikamp 1810ac27a0ecSDave Kleikamp static int 1811617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 1812617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1813ac27a0ecSDave Kleikamp { 1814ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1815ac27a0ecSDave Kleikamp int error; 1816ac27a0ecSDave Kleikamp 1817ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 1818ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 1819ac27a0ecSDave Kleikamp 1820617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 1821ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 1822fb265c9cSTheodore Ts'o bs->bh = ext4_sb_bread(sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 1823fb265c9cSTheodore Ts'o if (IS_ERR(bs->bh)) 1824fb265c9cSTheodore Ts'o return PTR_ERR(bs->bh); 1825ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 1826ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 1827ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 1828de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bs->bh); 1829de05ca85STheodore Ts'o if (error) 1830fb265c9cSTheodore Ts'o return error; 1831ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1832ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 1833ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 1834ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 1835ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 18369496005dSTheodore Ts'o error = xattr_find_entry(inode, &bs->s.here, bs->s.end, 18379496005dSTheodore Ts'o i->name_index, i->name, 1); 1838ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1839fb265c9cSTheodore Ts'o return error; 1840ac27a0ecSDave Kleikamp bs->s.not_found = error; 1841ac27a0ecSDave Kleikamp } 1842fb265c9cSTheodore Ts'o return 0; 1843ac27a0ecSDave Kleikamp } 1844ac27a0ecSDave Kleikamp 1845ac27a0ecSDave Kleikamp static int 1846617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 1847617ba13bSMingming Cao struct ext4_xattr_info *i, 1848617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1849ac27a0ecSDave Kleikamp { 1850ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1851ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 1852b347e2bcSTahsin Erdogan struct ext4_xattr_search s_copy = bs->s; 1853b347e2bcSTahsin Erdogan struct ext4_xattr_search *s = &s_copy; 18547a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 18558a2bfdcbSMingming Cao int error = 0; 185647387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 1857a6d05676STahsin Erdogan struct inode *ea_inode = NULL, *tmp_inode; 1858a6d05676STahsin Erdogan size_t old_ea_inode_quota = 0; 1859a6d05676STahsin Erdogan unsigned int ea_ino; 1860a6d05676STahsin Erdogan 1861ac27a0ecSDave Kleikamp 1862617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 1863ac27a0ecSDave Kleikamp 1864ac27a0ecSDave Kleikamp if (s->base) { 18655d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 18668a2bfdcbSMingming Cao error = ext4_journal_get_write_access(handle, bs->bh); 18678a2bfdcbSMingming Cao if (error) 18688a2bfdcbSMingming Cao goto cleanup; 18698a2bfdcbSMingming Cao lock_buffer(bs->bh); 18708a2bfdcbSMingming Cao 1871ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 187282939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 187382939d79SJan Kara 187482939d79SJan Kara /* 187582939d79SJan Kara * This must happen under buffer lock for 187682939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 187782939d79SJan Kara * block 187882939d79SJan Kara */ 1879cdb7ee4cSTahsin Erdogan if (ea_block_cache) 188047387409STahsin Erdogan mb_cache_entry_delete(ea_block_cache, hash, 188182939d79SJan Kara bs->bh->b_blocknr); 1882ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 1883daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 1884daf83281STahsin Erdogan true /* is_block */); 1885dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bs->bh); 1886ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 18876a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1888ac27a0ecSDave Kleikamp goto bad_block; 1889ac27a0ecSDave Kleikamp if (!error) 1890dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 18910390131bSFrank Mayhar inode, 1892ac27a0ecSDave Kleikamp bs->bh); 1893ac27a0ecSDave Kleikamp if (error) 1894ac27a0ecSDave Kleikamp goto cleanup; 1895ac27a0ecSDave Kleikamp goto inserted; 1896ac27a0ecSDave Kleikamp } else { 1897ac27a0ecSDave Kleikamp int offset = (char *)s->here - bs->bh->b_data; 1898ac27a0ecSDave Kleikamp 18998a2bfdcbSMingming Cao unlock_buffer(bs->bh); 1900ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 1901216553c4SJosef Bacik s->base = kmalloc(bs->bh->b_size, GFP_NOFS); 1902ac27a0ecSDave Kleikamp error = -ENOMEM; 1903ac27a0ecSDave Kleikamp if (s->base == NULL) 1904ac27a0ecSDave Kleikamp goto cleanup; 1905ac27a0ecSDave Kleikamp memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); 1906ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1907ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1908ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 1909ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 1910dec214d0STahsin Erdogan 1911dec214d0STahsin Erdogan /* 1912dec214d0STahsin Erdogan * If existing entry points to an xattr inode, we need 1913dec214d0STahsin Erdogan * to prevent ext4_xattr_set_entry() from decrementing 1914dec214d0STahsin Erdogan * ref count on it because the reference belongs to the 1915dec214d0STahsin Erdogan * original block. In this case, make the entry look 1916dec214d0STahsin Erdogan * like it has an empty value. 1917dec214d0STahsin Erdogan */ 1918dec214d0STahsin Erdogan if (!s->not_found && s->here->e_value_inum) { 1919a6d05676STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 1920a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, 1921a6d05676STahsin Erdogan le32_to_cpu(s->here->e_hash), 1922a6d05676STahsin Erdogan &tmp_inode); 1923a6d05676STahsin Erdogan if (error) 1924a6d05676STahsin Erdogan goto cleanup; 1925a6d05676STahsin Erdogan 1926a6d05676STahsin Erdogan if (!ext4_test_inode_state(tmp_inode, 1927a6d05676STahsin Erdogan EXT4_STATE_LUSTRE_EA_INODE)) { 1928dec214d0STahsin Erdogan /* 1929a6d05676STahsin Erdogan * Defer quota free call for previous 1930a6d05676STahsin Erdogan * inode until success is guaranteed. 1931dec214d0STahsin Erdogan */ 1932a6d05676STahsin Erdogan old_ea_inode_quota = le32_to_cpu( 1933dec214d0STahsin Erdogan s->here->e_value_size); 1934a6d05676STahsin Erdogan } 1935a6d05676STahsin Erdogan iput(tmp_inode); 1936a6d05676STahsin Erdogan 1937dec214d0STahsin Erdogan s->here->e_value_inum = 0; 1938dec214d0STahsin Erdogan s->here->e_value_size = 0; 1939dec214d0STahsin Erdogan } 1940ac27a0ecSDave Kleikamp } 1941ac27a0ecSDave Kleikamp } else { 1942ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 1943216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 1944ac27a0ecSDave Kleikamp /* assert(header == s->base) */ 1945ac27a0ecSDave Kleikamp error = -ENOMEM; 1946ac27a0ecSDave Kleikamp if (s->base == NULL) 1947ac27a0ecSDave Kleikamp goto cleanup; 1948617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 1949ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 1950ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1951ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1952ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 1953ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 1954ac27a0ecSDave Kleikamp } 1955ac27a0ecSDave Kleikamp 1956daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); 19576a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1958ac27a0ecSDave Kleikamp goto bad_block; 1959ac27a0ecSDave Kleikamp if (error) 1960ac27a0ecSDave Kleikamp goto cleanup; 1961dec214d0STahsin Erdogan 1962dec214d0STahsin Erdogan if (i->value && s->here->e_value_inum) { 1963dec214d0STahsin Erdogan /* 1964dec214d0STahsin Erdogan * A ref count on ea_inode has been taken as part of the call to 1965dec214d0STahsin Erdogan * ext4_xattr_set_entry() above. We would like to drop this 1966dec214d0STahsin Erdogan * extra ref but we have to wait until the xattr block is 1967dec214d0STahsin Erdogan * initialized and has its own ref count on the ea_inode. 1968dec214d0STahsin Erdogan */ 1969dec214d0STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 1970a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, 1971a6d05676STahsin Erdogan le32_to_cpu(s->here->e_hash), 1972a6d05676STahsin Erdogan &ea_inode); 1973dec214d0STahsin Erdogan if (error) { 1974dec214d0STahsin Erdogan ea_inode = NULL; 1975dec214d0STahsin Erdogan goto cleanup; 1976dec214d0STahsin Erdogan } 1977dec214d0STahsin Erdogan } 1978dec214d0STahsin Erdogan 1979ac27a0ecSDave Kleikamp inserted: 1980ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 198147387409STahsin Erdogan new_bh = ext4_xattr_block_cache_find(inode, header(s->base), 198247387409STahsin Erdogan &ce); 1983ac27a0ecSDave Kleikamp if (new_bh) { 1984ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 1985ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 1986ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 1987ac27a0ecSDave Kleikamp else { 19886048c64bSAndreas Gruenbacher u32 ref; 19896048c64bSAndreas Gruenbacher 1990b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 1991b8cb5a54STahsin Erdogan 1992ac27a0ecSDave Kleikamp /* The old block is released after updating 1993ac27a0ecSDave Kleikamp the inode. */ 19941231b3a1SLukas Czerner error = dquot_alloc_block(inode, 19951231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 19965dd4056dSChristoph Hellwig if (error) 1997ac27a0ecSDave Kleikamp goto cleanup; 19985d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 1999617ba13bSMingming Cao error = ext4_journal_get_write_access(handle, 2000ac27a0ecSDave Kleikamp new_bh); 2001ac27a0ecSDave Kleikamp if (error) 2002ac27a0ecSDave Kleikamp goto cleanup_dquot; 2003ac27a0ecSDave Kleikamp lock_buffer(new_bh); 200482939d79SJan Kara /* 200582939d79SJan Kara * We have to be careful about races with 20066048c64bSAndreas Gruenbacher * freeing, rehashing or adding references to 20076048c64bSAndreas Gruenbacher * xattr block. Once we hold buffer lock xattr 20086048c64bSAndreas Gruenbacher * block's state is stable so we can check 20096048c64bSAndreas Gruenbacher * whether the block got freed / rehashed or 20106048c64bSAndreas Gruenbacher * not. Since we unhash mbcache entry under 20116048c64bSAndreas Gruenbacher * buffer lock when freeing / rehashing xattr 20126048c64bSAndreas Gruenbacher * block, checking whether entry is still 20136048c64bSAndreas Gruenbacher * hashed is reliable. Same rules hold for 20146048c64bSAndreas Gruenbacher * e_reusable handling. 201582939d79SJan Kara */ 20166048c64bSAndreas Gruenbacher if (hlist_bl_unhashed(&ce->e_hash_list) || 20176048c64bSAndreas Gruenbacher !ce->e_reusable) { 201882939d79SJan Kara /* 201982939d79SJan Kara * Undo everything and check mbcache 202082939d79SJan Kara * again. 202182939d79SJan Kara */ 202282939d79SJan Kara unlock_buffer(new_bh); 202382939d79SJan Kara dquot_free_block(inode, 202482939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 202582939d79SJan Kara 1)); 202682939d79SJan Kara brelse(new_bh); 202747387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 202882939d79SJan Kara ce = NULL; 202982939d79SJan Kara new_bh = NULL; 203082939d79SJan Kara goto inserted; 203182939d79SJan Kara } 20326048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 20336048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 20346048c64bSAndreas Gruenbacher if (ref >= EXT4_XATTR_REFCOUNT_MAX) 20356048c64bSAndreas Gruenbacher ce->e_reusable = 0; 2036ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 20376048c64bSAndreas Gruenbacher ref); 2038dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2039ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2040dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 20410390131bSFrank Mayhar inode, 2042ac27a0ecSDave Kleikamp new_bh); 2043ac27a0ecSDave Kleikamp if (error) 2044ac27a0ecSDave Kleikamp goto cleanup_dquot; 2045ac27a0ecSDave Kleikamp } 204647387409STahsin Erdogan mb_cache_entry_touch(ea_block_cache, ce); 204747387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2048ac27a0ecSDave Kleikamp ce = NULL; 2049ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 2050ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 2051ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 2052ec000220STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); 2053ac27a0ecSDave Kleikamp new_bh = bs->bh; 2054ac27a0ecSDave Kleikamp get_bh(new_bh); 2055ac27a0ecSDave Kleikamp } else { 2056ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 2057fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 2058fb0a387dSEric Sandeen 2059b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 2060b8cb5a54STahsin Erdogan 2061fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 2062d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 2063fb0a387dSEric Sandeen 2064fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 206512e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 2066fb0a387dSEric Sandeen goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; 2067fb0a387dSEric Sandeen 206855f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 206955f020dbSAllison Henderson NULL, &error); 2070ac27a0ecSDave Kleikamp if (error) 2071ac27a0ecSDave Kleikamp goto cleanup; 2072fb0a387dSEric Sandeen 207312e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) 2074fb0a387dSEric Sandeen BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); 2075fb0a387dSEric Sandeen 2076ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 2077ace36ad4SJoe Perches (unsigned long long)block); 2078ac27a0ecSDave Kleikamp 2079ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 2080aebf0243SWang Shilong if (unlikely(!new_bh)) { 2081860d21e2STheodore Ts'o error = -ENOMEM; 2082ac27a0ecSDave Kleikamp getblk_failed: 20837dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 2084e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 2085ac27a0ecSDave Kleikamp goto cleanup; 2086ac27a0ecSDave Kleikamp } 2087dec214d0STahsin Erdogan error = ext4_xattr_inode_inc_ref_all(handle, inode, 2088dec214d0STahsin Erdogan ENTRY(header(s->base)+1)); 2089dec214d0STahsin Erdogan if (error) 2090dec214d0STahsin Erdogan goto getblk_failed; 2091dec214d0STahsin Erdogan if (ea_inode) { 2092dec214d0STahsin Erdogan /* Drop the extra ref on ea_inode. */ 2093dec214d0STahsin Erdogan error = ext4_xattr_inode_dec_ref(handle, 2094dec214d0STahsin Erdogan ea_inode); 2095dec214d0STahsin Erdogan if (error) 2096dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 2097dec214d0STahsin Erdogan "dec ref error=%d", 2098dec214d0STahsin Erdogan error); 2099dec214d0STahsin Erdogan iput(ea_inode); 2100dec214d0STahsin Erdogan ea_inode = NULL; 2101dec214d0STahsin Erdogan } 2102dec214d0STahsin Erdogan 2103ac27a0ecSDave Kleikamp lock_buffer(new_bh); 2104617ba13bSMingming Cao error = ext4_journal_get_create_access(handle, new_bh); 2105ac27a0ecSDave Kleikamp if (error) { 2106ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2107860d21e2STheodore Ts'o error = -EIO; 2108ac27a0ecSDave Kleikamp goto getblk_failed; 2109ac27a0ecSDave Kleikamp } 2110ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 2111dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2112ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 2113ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 211447387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, new_bh); 2115dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, 2116dac7a4b4STheodore Ts'o new_bh); 2117ac27a0ecSDave Kleikamp if (error) 2118ac27a0ecSDave Kleikamp goto cleanup; 2119ac27a0ecSDave Kleikamp } 2120ac27a0ecSDave Kleikamp } 2121ac27a0ecSDave Kleikamp 2122a6d05676STahsin Erdogan if (old_ea_inode_quota) 2123a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, NULL, old_ea_inode_quota); 2124dec214d0STahsin Erdogan 2125ac27a0ecSDave Kleikamp /* Update the inode. */ 2126617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 2127ac27a0ecSDave Kleikamp 2128ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 2129dec214d0STahsin Erdogan if (bs->bh && bs->bh != new_bh) { 2130dec214d0STahsin Erdogan struct ext4_xattr_inode_array *ea_inode_array = NULL; 2131dec214d0STahsin Erdogan 2132dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bs->bh, 2133dec214d0STahsin Erdogan &ea_inode_array, 2134dec214d0STahsin Erdogan 0 /* extra_credits */); 2135dec214d0STahsin Erdogan ext4_xattr_inode_array_free(ea_inode_array); 2136dec214d0STahsin Erdogan } 2137ac27a0ecSDave Kleikamp error = 0; 2138ac27a0ecSDave Kleikamp 2139ac27a0ecSDave Kleikamp cleanup: 2140dec214d0STahsin Erdogan if (ea_inode) { 2141dec214d0STahsin Erdogan int error2; 2142dec214d0STahsin Erdogan 2143dec214d0STahsin Erdogan error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); 2144dec214d0STahsin Erdogan if (error2) 2145dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "dec ref error=%d", 2146dec214d0STahsin Erdogan error2); 2147dec214d0STahsin Erdogan 2148dec214d0STahsin Erdogan /* If there was an error, revert the quota charge. */ 2149dec214d0STahsin Erdogan if (error) 2150a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, ea_inode, 2151dec214d0STahsin Erdogan i_size_read(ea_inode)); 2152dec214d0STahsin Erdogan iput(ea_inode); 2153dec214d0STahsin Erdogan } 2154ac27a0ecSDave Kleikamp if (ce) 215547387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2156ac27a0ecSDave Kleikamp brelse(new_bh); 2157ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 2158ac27a0ecSDave Kleikamp kfree(s->base); 2159ac27a0ecSDave Kleikamp 2160ac27a0ecSDave Kleikamp return error; 2161ac27a0ecSDave Kleikamp 2162ac27a0ecSDave Kleikamp cleanup_dquot: 21631231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 2164ac27a0ecSDave Kleikamp goto cleanup; 2165ac27a0ecSDave Kleikamp 2166ac27a0ecSDave Kleikamp bad_block: 216724676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 216824676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2169ac27a0ecSDave Kleikamp goto cleanup; 2170ac27a0ecSDave Kleikamp 2171ac27a0ecSDave Kleikamp #undef header 2172ac27a0ecSDave Kleikamp } 2173ac27a0ecSDave Kleikamp 2174879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 2175617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2176ac27a0ecSDave Kleikamp { 2177617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2178617ba13bSMingming Cao struct ext4_inode *raw_inode; 2179ac27a0ecSDave Kleikamp int error; 2180ac27a0ecSDave Kleikamp 2181617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 2182ac27a0ecSDave Kleikamp return 0; 2183617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 2184ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 2185ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 2186ac27a0ecSDave Kleikamp is->s.here = is->s.first; 2187617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 218819f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 21899e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 2190ac27a0ecSDave Kleikamp if (error) 2191ac27a0ecSDave Kleikamp return error; 2192ac27a0ecSDave Kleikamp /* Find the named attribute. */ 21939496005dSTheodore Ts'o error = xattr_find_entry(inode, &is->s.here, is->s.end, 21949496005dSTheodore Ts'o i->name_index, i->name, 0); 2195ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 2196ac27a0ecSDave Kleikamp return error; 2197ac27a0ecSDave Kleikamp is->s.not_found = error; 2198ac27a0ecSDave Kleikamp } 2199ac27a0ecSDave Kleikamp return 0; 2200ac27a0ecSDave Kleikamp } 2201ac27a0ecSDave Kleikamp 22020d812f77STao Ma int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, 22030d812f77STao Ma struct ext4_xattr_info *i, 22040d812f77STao Ma struct ext4_xattr_ibody_find *is) 22050d812f77STao Ma { 22060d812f77STao Ma struct ext4_xattr_ibody_header *header; 22070d812f77STao Ma struct ext4_xattr_search *s = &is->s; 22080d812f77STao Ma int error; 22090d812f77STao Ma 22100d812f77STao Ma if (EXT4_I(inode)->i_extra_isize == 0) 22110d812f77STao Ma return -ENOSPC; 2212daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 22130d812f77STao Ma if (error) 22140d812f77STao Ma return error; 22150d812f77STao Ma header = IHDR(inode, ext4_raw_inode(&is->iloc)); 22160d812f77STao Ma if (!IS_LAST_ENTRY(s->first)) { 22170d812f77STao Ma header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 22180d812f77STao Ma ext4_set_inode_state(inode, EXT4_STATE_XATTR); 22190d812f77STao Ma } else { 22200d812f77STao Ma header->h_magic = cpu_to_le32(0); 22210d812f77STao Ma ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 22220d812f77STao Ma } 22230d812f77STao Ma return 0; 22240d812f77STao Ma } 22250d812f77STao Ma 2226e50e5129SAndreas Dilger static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 2227617ba13bSMingming Cao struct ext4_xattr_info *i, 2228617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2229ac27a0ecSDave Kleikamp { 2230617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2231617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 2232ac27a0ecSDave Kleikamp int error; 2233ac27a0ecSDave Kleikamp 2234617ba13bSMingming Cao if (EXT4_I(inode)->i_extra_isize == 0) 2235ac27a0ecSDave Kleikamp return -ENOSPC; 2236daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 2237ac27a0ecSDave Kleikamp if (error) 2238ac27a0ecSDave Kleikamp return error; 2239617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 2240ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 2241617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 224219f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 2243ac27a0ecSDave Kleikamp } else { 2244ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 224519f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 2246ac27a0ecSDave Kleikamp } 2247ac27a0ecSDave Kleikamp return 0; 2248ac27a0ecSDave Kleikamp } 2249ac27a0ecSDave Kleikamp 22503fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 22513fd16462SJan Kara struct ext4_xattr_info *i) 22523fd16462SJan Kara { 22533fd16462SJan Kara void *value; 22543fd16462SJan Kara 22550bd454c0STahsin Erdogan /* When e_value_inum is set the value is stored externally. */ 22560bd454c0STahsin Erdogan if (s->here->e_value_inum) 22570bd454c0STahsin Erdogan return 0; 22583fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 22593fd16462SJan Kara return 0; 22603fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 22613fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 22623fd16462SJan Kara } 22633fd16462SJan Kara 2264dec214d0STahsin Erdogan static struct buffer_head *ext4_xattr_get_block(struct inode *inode) 2265dec214d0STahsin Erdogan { 2266dec214d0STahsin Erdogan struct buffer_head *bh; 2267dec214d0STahsin Erdogan int error; 2268dec214d0STahsin Erdogan 2269dec214d0STahsin Erdogan if (!EXT4_I(inode)->i_file_acl) 2270dec214d0STahsin Erdogan return NULL; 2271fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2272fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 2273fb265c9cSTheodore Ts'o return bh; 2274dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2275ecaaf408SVasily Averin if (error) { 2276ecaaf408SVasily Averin brelse(bh); 2277dec214d0STahsin Erdogan return ERR_PTR(error); 2278ecaaf408SVasily Averin } 2279dec214d0STahsin Erdogan return bh; 2280dec214d0STahsin Erdogan } 2281dec214d0STahsin Erdogan 2282ac27a0ecSDave Kleikamp /* 2283617ba13bSMingming Cao * ext4_xattr_set_handle() 2284ac27a0ecSDave Kleikamp * 22856e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 2286ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 2287ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 2288ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 2289ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 2290ac27a0ecSDave Kleikamp * previous to the call, respectively. 2291ac27a0ecSDave Kleikamp * 2292ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2293ac27a0ecSDave Kleikamp */ 2294ac27a0ecSDave Kleikamp int 2295617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 2296ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 2297ac27a0ecSDave Kleikamp int flags) 2298ac27a0ecSDave Kleikamp { 2299617ba13bSMingming Cao struct ext4_xattr_info i = { 2300ac27a0ecSDave Kleikamp .name_index = name_index, 2301ac27a0ecSDave Kleikamp .name = name, 2302ac27a0ecSDave Kleikamp .value = value, 2303ac27a0ecSDave Kleikamp .value_len = value_len, 2304e50e5129SAndreas Dilger .in_inode = 0, 2305ac27a0ecSDave Kleikamp }; 2306617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 2307ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2308ac27a0ecSDave Kleikamp }; 2309617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 2310ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2311ac27a0ecSDave Kleikamp }; 2312c755e251STheodore Ts'o int no_expand; 2313ac27a0ecSDave Kleikamp int error; 2314ac27a0ecSDave Kleikamp 2315ac27a0ecSDave Kleikamp if (!name) 2316ac27a0ecSDave Kleikamp return -EINVAL; 2317ac27a0ecSDave Kleikamp if (strlen(name) > 255) 2318ac27a0ecSDave Kleikamp return -ERANGE; 2319b8cb5a54STahsin Erdogan 2320c755e251STheodore Ts'o ext4_write_lock_xattr(inode, &no_expand); 23214d20c685SKalpak Shah 2322c1a5d5f6STahsin Erdogan /* Check journal credits under write lock. */ 2323c1a5d5f6STahsin Erdogan if (ext4_handle_valid(handle)) { 2324dec214d0STahsin Erdogan struct buffer_head *bh; 2325c1a5d5f6STahsin Erdogan int credits; 2326c1a5d5f6STahsin Erdogan 2327dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2328dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2329dec214d0STahsin Erdogan error = PTR_ERR(bh); 2330dec214d0STahsin Erdogan goto cleanup; 2331dec214d0STahsin Erdogan } 2332dec214d0STahsin Erdogan 2333af65207cSTahsin Erdogan credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2334af65207cSTahsin Erdogan value_len, 2335af65207cSTahsin Erdogan flags & XATTR_CREATE); 2336dec214d0STahsin Erdogan brelse(bh); 2337dec214d0STahsin Erdogan 2338c1a5d5f6STahsin Erdogan if (!ext4_handle_has_enough_credits(handle, credits)) { 2339c1a5d5f6STahsin Erdogan error = -ENOSPC; 2340c1a5d5f6STahsin Erdogan goto cleanup; 2341c1a5d5f6STahsin Erdogan } 2342c1a5d5f6STahsin Erdogan } 2343c1a5d5f6STahsin Erdogan 234466543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 234586ebfd08SEric Sandeen if (error) 234686ebfd08SEric Sandeen goto cleanup; 234786ebfd08SEric Sandeen 234819f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 2349617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 2350617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 235119f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 2352ac27a0ecSDave Kleikamp } 2353ac27a0ecSDave Kleikamp 2354617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 2355ac27a0ecSDave Kleikamp if (error) 2356ac27a0ecSDave Kleikamp goto cleanup; 2357ac27a0ecSDave Kleikamp if (is.s.not_found) 2358617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 2359ac27a0ecSDave Kleikamp if (error) 2360ac27a0ecSDave Kleikamp goto cleanup; 2361ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 2362ac27a0ecSDave Kleikamp error = -ENODATA; 2363ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 2364ac27a0ecSDave Kleikamp goto cleanup; 2365ac27a0ecSDave Kleikamp error = 0; 2366ac27a0ecSDave Kleikamp if (!value) 2367ac27a0ecSDave Kleikamp goto cleanup; 2368ac27a0ecSDave Kleikamp } else { 2369ac27a0ecSDave Kleikamp error = -EEXIST; 2370ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 2371ac27a0ecSDave Kleikamp goto cleanup; 2372ac27a0ecSDave Kleikamp } 2373dec214d0STahsin Erdogan 2374ac27a0ecSDave Kleikamp if (!value) { 2375ac27a0ecSDave Kleikamp if (!is.s.not_found) 2376e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2377ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 2378617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2379ac27a0ecSDave Kleikamp } else { 23803fd16462SJan Kara error = 0; 23813fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 23823fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 23833fd16462SJan Kara goto cleanup; 23843fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 23853fd16462SJan Kara goto cleanup; 23863fd16462SJan Kara 2387b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2388b347e2bcSTahsin Erdogan (EXT4_XATTR_SIZE(i.value_len) > 2389b347e2bcSTahsin Erdogan EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) 2390b347e2bcSTahsin Erdogan i.in_inode = 1; 2391b347e2bcSTahsin Erdogan retry_inode: 2392e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2393ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 2394ac27a0ecSDave Kleikamp i.value = NULL; 2395617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2396ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 23977e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 239845ae932dSVasily Averin brelse(bs.bh); 239945ae932dSVasily Averin bs.bh = NULL; 24007e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 24017e01c8e5STiger Yang if (error) 24027e01c8e5STiger Yang goto cleanup; 24037e01c8e5STiger Yang } 2404617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2405b347e2bcSTahsin Erdogan if (!error && !is.s.not_found) { 2406ac27a0ecSDave Kleikamp i.value = NULL; 2407e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, 2408e50e5129SAndreas Dilger &is); 2409b347e2bcSTahsin Erdogan } else if (error == -ENOSPC) { 2410b347e2bcSTahsin Erdogan /* 2411b347e2bcSTahsin Erdogan * Xattr does not fit in the block, store at 2412b347e2bcSTahsin Erdogan * external inode if possible. 2413b347e2bcSTahsin Erdogan */ 2414b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2415b347e2bcSTahsin Erdogan !i.in_inode) { 2416b347e2bcSTahsin Erdogan i.in_inode = 1; 2417b347e2bcSTahsin Erdogan goto retry_inode; 2418b347e2bcSTahsin Erdogan } 2419ac27a0ecSDave Kleikamp } 2420ac27a0ecSDave Kleikamp } 2421ac27a0ecSDave Kleikamp } 2422ac27a0ecSDave Kleikamp if (!error) { 2423617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 2424eeca7ea1SDeepa Dinamani inode->i_ctime = current_time(inode); 24256dd4ee7cSKalpak Shah if (!value) 2426c755e251STheodore Ts'o no_expand = 0; 2427617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 2428ac27a0ecSDave Kleikamp /* 2429617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 2430ac27a0ecSDave Kleikamp * error != 0. 2431ac27a0ecSDave Kleikamp */ 2432ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 2433ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 24340390131bSFrank Mayhar ext4_handle_sync(handle); 2435ac27a0ecSDave Kleikamp } 2436ac27a0ecSDave Kleikamp 2437ac27a0ecSDave Kleikamp cleanup: 2438ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 2439ac27a0ecSDave Kleikamp brelse(bs.bh); 2440c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 2441ac27a0ecSDave Kleikamp return error; 2442ac27a0ecSDave Kleikamp } 2443ac27a0ecSDave Kleikamp 2444af65207cSTahsin Erdogan int ext4_xattr_set_credits(struct inode *inode, size_t value_len, 2445af65207cSTahsin Erdogan bool is_create, int *credits) 2446c1a5d5f6STahsin Erdogan { 2447dec214d0STahsin Erdogan struct buffer_head *bh; 2448dec214d0STahsin Erdogan int err; 2449c1a5d5f6STahsin Erdogan 2450dec214d0STahsin Erdogan *credits = 0; 2451dec214d0STahsin Erdogan 2452dec214d0STahsin Erdogan if (!EXT4_SB(inode->i_sb)->s_journal) 2453c1a5d5f6STahsin Erdogan return 0; 2454c1a5d5f6STahsin Erdogan 2455dec214d0STahsin Erdogan down_read(&EXT4_I(inode)->xattr_sem); 2456c1a5d5f6STahsin Erdogan 2457dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2458dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2459dec214d0STahsin Erdogan err = PTR_ERR(bh); 2460dec214d0STahsin Erdogan } else { 2461af65207cSTahsin Erdogan *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2462af65207cSTahsin Erdogan value_len, is_create); 2463dec214d0STahsin Erdogan brelse(bh); 2464dec214d0STahsin Erdogan err = 0; 2465c1a5d5f6STahsin Erdogan } 2466dec214d0STahsin Erdogan 2467dec214d0STahsin Erdogan up_read(&EXT4_I(inode)->xattr_sem); 2468dec214d0STahsin Erdogan return err; 2469c1a5d5f6STahsin Erdogan } 2470c1a5d5f6STahsin Erdogan 2471ac27a0ecSDave Kleikamp /* 2472617ba13bSMingming Cao * ext4_xattr_set() 2473ac27a0ecSDave Kleikamp * 2474617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 2475ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 2476ac27a0ecSDave Kleikamp * 2477ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2478ac27a0ecSDave Kleikamp */ 2479ac27a0ecSDave Kleikamp int 2480617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 2481ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 2482ac27a0ecSDave Kleikamp { 2483ac27a0ecSDave Kleikamp handle_t *handle; 2484e50e5129SAndreas Dilger struct super_block *sb = inode->i_sb; 2485ac27a0ecSDave Kleikamp int error, retries = 0; 2486c1a5d5f6STahsin Erdogan int credits; 2487ac27a0ecSDave Kleikamp 2488b8cb5a54STahsin Erdogan error = dquot_initialize(inode); 2489b8cb5a54STahsin Erdogan if (error) 2490b8cb5a54STahsin Erdogan return error; 2491e50e5129SAndreas Dilger 2492ac27a0ecSDave Kleikamp retry: 2493af65207cSTahsin Erdogan error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, 2494af65207cSTahsin Erdogan &credits); 2495dec214d0STahsin Erdogan if (error) 2496dec214d0STahsin Erdogan return error; 2497dec214d0STahsin Erdogan 24989924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 2499ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 2500ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 2501ac27a0ecSDave Kleikamp } else { 2502ac27a0ecSDave Kleikamp int error2; 2503ac27a0ecSDave Kleikamp 2504617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 2505ac27a0ecSDave Kleikamp value, value_len, flags); 2506617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 2507ac27a0ecSDave Kleikamp if (error == -ENOSPC && 2508e50e5129SAndreas Dilger ext4_should_retry_alloc(sb, &retries)) 2509ac27a0ecSDave Kleikamp goto retry; 2510ac27a0ecSDave Kleikamp if (error == 0) 2511ac27a0ecSDave Kleikamp error = error2; 2512ac27a0ecSDave Kleikamp } 2513ac27a0ecSDave Kleikamp 2514ac27a0ecSDave Kleikamp return error; 2515ac27a0ecSDave Kleikamp } 2516ac27a0ecSDave Kleikamp 2517ac27a0ecSDave Kleikamp /* 25186dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 25196dd4ee7cSKalpak Shah * i_extra_isize. 25206dd4ee7cSKalpak Shah */ 25216dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 25226dd4ee7cSKalpak Shah int value_offs_shift, void *to, 252394405713SJan Kara void *from, size_t n) 25246dd4ee7cSKalpak Shah { 25256dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 25266dd4ee7cSKalpak Shah int new_offs; 25276dd4ee7cSKalpak Shah 252894405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 252994405713SJan Kara BUG_ON(value_offs_shift > 0); 253094405713SJan Kara 25316dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 25326dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 2533e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 25346dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 25356dd4ee7cSKalpak Shah value_offs_shift; 25366dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 25376dd4ee7cSKalpak Shah } 25386dd4ee7cSKalpak Shah } 25396dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 25406dd4ee7cSKalpak Shah memmove(to, from, n); 25416dd4ee7cSKalpak Shah } 25426dd4ee7cSKalpak Shah 25436dd4ee7cSKalpak Shah /* 25443f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 25453f2571c1SJan Kara */ 25463f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 25473f2571c1SJan Kara struct ext4_inode *raw_inode, 25483f2571c1SJan Kara struct ext4_xattr_entry *entry) 25493f2571c1SJan Kara { 25503f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 25513f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 25523f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 2553f6109100STahsin Erdogan size_t value_size = le32_to_cpu(entry->e_value_size); 25543f2571c1SJan Kara struct ext4_xattr_info i = { 25553f2571c1SJan Kara .value = NULL, 25563f2571c1SJan Kara .value_len = 0, 25573f2571c1SJan Kara .name_index = entry->e_name_index, 2558f6109100STahsin Erdogan .in_inode = !!entry->e_value_inum, 25593f2571c1SJan Kara }; 25603f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 25613f2571c1SJan Kara int error; 25623f2571c1SJan Kara 25633f2571c1SJan Kara is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 25643f2571c1SJan Kara bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 25653f2571c1SJan Kara buffer = kmalloc(value_size, GFP_NOFS); 25663f2571c1SJan Kara b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 25673f2571c1SJan Kara if (!is || !bs || !buffer || !b_entry_name) { 25683f2571c1SJan Kara error = -ENOMEM; 25693f2571c1SJan Kara goto out; 25703f2571c1SJan Kara } 25713f2571c1SJan Kara 25723f2571c1SJan Kara is->s.not_found = -ENODATA; 25733f2571c1SJan Kara bs->s.not_found = -ENODATA; 25743f2571c1SJan Kara is->iloc.bh = NULL; 25753f2571c1SJan Kara bs->bh = NULL; 25763f2571c1SJan Kara 25773f2571c1SJan Kara /* Save the entry name and the entry value */ 2578f6109100STahsin Erdogan if (entry->e_value_inum) { 2579b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, value_size); 2580f6109100STahsin Erdogan if (error) 2581f6109100STahsin Erdogan goto out; 2582f6109100STahsin Erdogan } else { 2583f6109100STahsin Erdogan size_t value_offs = le16_to_cpu(entry->e_value_offs); 25843f2571c1SJan Kara memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); 2585f6109100STahsin Erdogan } 2586f6109100STahsin Erdogan 25873f2571c1SJan Kara memcpy(b_entry_name, entry->e_name, entry->e_name_len); 25883f2571c1SJan Kara b_entry_name[entry->e_name_len] = '\0'; 25893f2571c1SJan Kara i.name = b_entry_name; 25903f2571c1SJan Kara 25913f2571c1SJan Kara error = ext4_get_inode_loc(inode, &is->iloc); 25923f2571c1SJan Kara if (error) 25933f2571c1SJan Kara goto out; 25943f2571c1SJan Kara 25953f2571c1SJan Kara error = ext4_xattr_ibody_find(inode, &i, is); 25963f2571c1SJan Kara if (error) 25973f2571c1SJan Kara goto out; 25983f2571c1SJan Kara 25993f2571c1SJan Kara /* Remove the chosen entry from the inode */ 2600e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, is); 26013f2571c1SJan Kara if (error) 26023f2571c1SJan Kara goto out; 26033f2571c1SJan Kara 26043f2571c1SJan Kara i.value = buffer; 26053f2571c1SJan Kara i.value_len = value_size; 26063f2571c1SJan Kara error = ext4_xattr_block_find(inode, &i, bs); 26073f2571c1SJan Kara if (error) 26083f2571c1SJan Kara goto out; 26093f2571c1SJan Kara 26103f2571c1SJan Kara /* Add entry which was removed from the inode into the block */ 26113f2571c1SJan Kara error = ext4_xattr_block_set(handle, inode, &i, bs); 26123f2571c1SJan Kara if (error) 26133f2571c1SJan Kara goto out; 26143f2571c1SJan Kara error = 0; 26153f2571c1SJan Kara out: 26163f2571c1SJan Kara kfree(b_entry_name); 26173f2571c1SJan Kara kfree(buffer); 26183f2571c1SJan Kara if (is) 26193f2571c1SJan Kara brelse(is->iloc.bh); 26206bdc9977SVasily Averin if (bs) 26216bdc9977SVasily Averin brelse(bs->bh); 26223f2571c1SJan Kara kfree(is); 26233f2571c1SJan Kara kfree(bs); 26243f2571c1SJan Kara 26253f2571c1SJan Kara return error; 26263f2571c1SJan Kara } 26273f2571c1SJan Kara 2628dfa2064bSJan Kara static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, 2629dfa2064bSJan Kara struct ext4_inode *raw_inode, 2630dfa2064bSJan Kara int isize_diff, size_t ifree, 2631dfa2064bSJan Kara size_t bfree, int *total_ino) 2632dfa2064bSJan Kara { 2633dfa2064bSJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 2634dfa2064bSJan Kara struct ext4_xattr_entry *small_entry; 2635dfa2064bSJan Kara struct ext4_xattr_entry *entry; 2636dfa2064bSJan Kara struct ext4_xattr_entry *last; 2637dfa2064bSJan Kara unsigned int entry_size; /* EA entry size */ 2638dfa2064bSJan Kara unsigned int total_size; /* EA entry size + value size */ 2639dfa2064bSJan Kara unsigned int min_total_size; 2640dfa2064bSJan Kara int error; 2641dfa2064bSJan Kara 2642dfa2064bSJan Kara while (isize_diff > ifree) { 2643dfa2064bSJan Kara entry = NULL; 2644dfa2064bSJan Kara small_entry = NULL; 2645dfa2064bSJan Kara min_total_size = ~0U; 2646dfa2064bSJan Kara last = IFIRST(header); 2647dfa2064bSJan Kara /* Find the entry best suited to be pushed into EA block */ 2648dfa2064bSJan Kara for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 26498cdb5240STheodore Ts'o /* never move system.data out of the inode */ 26508cdb5240STheodore Ts'o if ((last->e_name_len == 4) && 26518cdb5240STheodore Ts'o (last->e_name_index == EXT4_XATTR_INDEX_SYSTEM) && 26528cdb5240STheodore Ts'o !memcmp(last->e_name, "data", 4)) 26538cdb5240STheodore Ts'o continue; 26549bb21cedSTahsin Erdogan total_size = EXT4_XATTR_LEN(last->e_name_len); 26559bb21cedSTahsin Erdogan if (!last->e_value_inum) 26569bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 26579bb21cedSTahsin Erdogan le32_to_cpu(last->e_value_size)); 2658dfa2064bSJan Kara if (total_size <= bfree && 2659dfa2064bSJan Kara total_size < min_total_size) { 2660dfa2064bSJan Kara if (total_size + ifree < isize_diff) { 2661dfa2064bSJan Kara small_entry = last; 2662dfa2064bSJan Kara } else { 2663dfa2064bSJan Kara entry = last; 2664dfa2064bSJan Kara min_total_size = total_size; 2665dfa2064bSJan Kara } 2666dfa2064bSJan Kara } 2667dfa2064bSJan Kara } 2668dfa2064bSJan Kara 2669dfa2064bSJan Kara if (entry == NULL) { 2670dfa2064bSJan Kara if (small_entry == NULL) 2671dfa2064bSJan Kara return -ENOSPC; 2672dfa2064bSJan Kara entry = small_entry; 2673dfa2064bSJan Kara } 2674dfa2064bSJan Kara 2675dfa2064bSJan Kara entry_size = EXT4_XATTR_LEN(entry->e_name_len); 26769bb21cedSTahsin Erdogan total_size = entry_size; 26779bb21cedSTahsin Erdogan if (!entry->e_value_inum) 26789bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 26799bb21cedSTahsin Erdogan le32_to_cpu(entry->e_value_size)); 2680dfa2064bSJan Kara error = ext4_xattr_move_to_block(handle, inode, raw_inode, 2681dfa2064bSJan Kara entry); 2682dfa2064bSJan Kara if (error) 2683dfa2064bSJan Kara return error; 2684dfa2064bSJan Kara 2685dfa2064bSJan Kara *total_ino -= entry_size; 2686dfa2064bSJan Kara ifree += total_size; 2687dfa2064bSJan Kara bfree -= total_size; 2688dfa2064bSJan Kara } 2689dfa2064bSJan Kara 2690dfa2064bSJan Kara return 0; 2691dfa2064bSJan Kara } 2692dfa2064bSJan Kara 26933f2571c1SJan Kara /* 26946dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 26956dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 26966dd4ee7cSKalpak Shah */ 26976dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 26986dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 26996dd4ee7cSKalpak Shah { 27006dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 2701cf0a5e81SMiao Xie struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 2702cf0a5e81SMiao Xie static unsigned int mnt_count; 2703e3014d14SJan Kara size_t min_offs; 2704e3014d14SJan Kara size_t ifree, bfree; 27057b1b2c1bSTheodore Ts'o int total_ino; 27066e0cd088SJan Kara void *base, *end; 2707d0141191SJan Kara int error = 0, tried_min_extra_isize = 0; 2708cf0a5e81SMiao Xie int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); 2709d0141191SJan Kara int isize_diff; /* How much do we need to grow i_extra_isize */ 2710c755e251STheodore Ts'o 27116dd4ee7cSKalpak Shah retry: 2712d0141191SJan Kara isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; 27132e81a4eeSJan Kara if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) 2714b640b2c5SMiao Xie return 0; 27156dd4ee7cSKalpak Shah 27166dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 27176dd4ee7cSKalpak Shah 27186dd4ee7cSKalpak Shah /* 27196dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 27206dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 27216dd4ee7cSKalpak Shah */ 27226dd4ee7cSKalpak Shah 27236e0cd088SJan Kara base = IFIRST(header); 27246dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 27256dd4ee7cSKalpak Shah min_offs = end - base; 2726a805622aSTheodore Ts'o total_ino = sizeof(struct ext4_xattr_ibody_header) + sizeof(u32); 27276dd4ee7cSKalpak Shah 27289e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 27299e92f48cSTheodore Ts'o if (error) 27309e92f48cSTheodore Ts'o goto cleanup; 27319e92f48cSTheodore Ts'o 27326e0cd088SJan Kara ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); 2733e3014d14SJan Kara if (ifree >= isize_diff) 2734e3014d14SJan Kara goto shift; 27356dd4ee7cSKalpak Shah 27366dd4ee7cSKalpak Shah /* 27376dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 27386dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 27396dd4ee7cSKalpak Shah */ 27406dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 274153692ec0SVasily Averin struct buffer_head *bh; 274253692ec0SVasily Averin 2743fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2744fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 2745fb265c9cSTheodore Ts'o error = PTR_ERR(bh); 27466dd4ee7cSKalpak Shah goto cleanup; 2747fb265c9cSTheodore Ts'o } 2748de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 274953692ec0SVasily Averin if (error) { 275053692ec0SVasily Averin brelse(bh); 27516dd4ee7cSKalpak Shah goto cleanup; 275253692ec0SVasily Averin } 27536dd4ee7cSKalpak Shah base = BHDR(bh); 27546dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 27556dd4ee7cSKalpak Shah min_offs = end - base; 27566e0cd088SJan Kara bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, 27576e0cd088SJan Kara NULL); 2758b640b2c5SMiao Xie brelse(bh); 2759e3014d14SJan Kara if (bfree + ifree < isize_diff) { 27606dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 27616dd4ee7cSKalpak Shah tried_min_extra_isize++; 27626dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 27636dd4ee7cSKalpak Shah goto retry; 27646dd4ee7cSKalpak Shah } 2765dfa2064bSJan Kara error = -ENOSPC; 27666dd4ee7cSKalpak Shah goto cleanup; 27676dd4ee7cSKalpak Shah } 27686dd4ee7cSKalpak Shah } else { 2769e3014d14SJan Kara bfree = inode->i_sb->s_blocksize; 27706dd4ee7cSKalpak Shah } 27716dd4ee7cSKalpak Shah 2772dfa2064bSJan Kara error = ext4_xattr_make_inode_space(handle, inode, raw_inode, 2773dfa2064bSJan Kara isize_diff, ifree, bfree, 2774dfa2064bSJan Kara &total_ino); 2775dfa2064bSJan Kara if (error) { 2776dfa2064bSJan Kara if (error == -ENOSPC && !tried_min_extra_isize && 27776dd4ee7cSKalpak Shah s_min_extra_isize) { 27786dd4ee7cSKalpak Shah tried_min_extra_isize++; 27796dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 27806dd4ee7cSKalpak Shah goto retry; 27816dd4ee7cSKalpak Shah } 27826dd4ee7cSKalpak Shah goto cleanup; 27836dd4ee7cSKalpak Shah } 2784e3014d14SJan Kara shift: 2785e3014d14SJan Kara /* Adjust the offsets and shift the remaining entries ahead */ 27866e0cd088SJan Kara ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize 2787e3014d14SJan Kara - new_extra_isize, (void *)raw_inode + 2788e3014d14SJan Kara EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 278994405713SJan Kara (void *)header, total_ino); 2790e3014d14SJan Kara EXT4_I(inode)->i_extra_isize = new_extra_isize; 27916dd4ee7cSKalpak Shah 27926dd4ee7cSKalpak Shah cleanup: 2793b640b2c5SMiao Xie if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) { 2794cf0a5e81SMiao Xie ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", 2795cf0a5e81SMiao Xie inode->i_ino); 2796cf0a5e81SMiao Xie mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); 2797cf0a5e81SMiao Xie } 27986dd4ee7cSKalpak Shah return error; 27996dd4ee7cSKalpak Shah } 28006dd4ee7cSKalpak Shah 2801e50e5129SAndreas Dilger #define EIA_INCR 16 /* must be 2^n */ 2802e50e5129SAndreas Dilger #define EIA_MASK (EIA_INCR - 1) 2803dec214d0STahsin Erdogan 2804dec214d0STahsin Erdogan /* Add the large xattr @inode into @ea_inode_array for deferred iput(). 28050421a189STahsin Erdogan * If @ea_inode_array is new or full it will be grown and the old 2806e50e5129SAndreas Dilger * contents copied over. 2807e50e5129SAndreas Dilger */ 2808e50e5129SAndreas Dilger static int 28090421a189STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 28100421a189STahsin Erdogan struct inode *inode) 2811e50e5129SAndreas Dilger { 28120421a189STahsin Erdogan if (*ea_inode_array == NULL) { 2813e50e5129SAndreas Dilger /* 2814e50e5129SAndreas Dilger * Start with 15 inodes, so it fits into a power-of-two size. 28150421a189STahsin Erdogan * If *ea_inode_array is NULL, this is essentially offsetof() 2816e50e5129SAndreas Dilger */ 28170421a189STahsin Erdogan (*ea_inode_array) = 28180421a189STahsin Erdogan kmalloc(offsetof(struct ext4_xattr_inode_array, 28190421a189STahsin Erdogan inodes[EIA_MASK]), 2820e50e5129SAndreas Dilger GFP_NOFS); 28210421a189STahsin Erdogan if (*ea_inode_array == NULL) 2822e50e5129SAndreas Dilger return -ENOMEM; 28230421a189STahsin Erdogan (*ea_inode_array)->count = 0; 28240421a189STahsin Erdogan } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { 2825e50e5129SAndreas Dilger /* expand the array once all 15 + n * 16 slots are full */ 28260421a189STahsin Erdogan struct ext4_xattr_inode_array *new_array = NULL; 28270421a189STahsin Erdogan int count = (*ea_inode_array)->count; 2828e50e5129SAndreas Dilger 2829e50e5129SAndreas Dilger /* if new_array is NULL, this is essentially offsetof() */ 2830e50e5129SAndreas Dilger new_array = kmalloc( 28310421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, 28320421a189STahsin Erdogan inodes[count + EIA_INCR]), 2833e50e5129SAndreas Dilger GFP_NOFS); 2834e50e5129SAndreas Dilger if (new_array == NULL) 2835e50e5129SAndreas Dilger return -ENOMEM; 28360421a189STahsin Erdogan memcpy(new_array, *ea_inode_array, 28370421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, inodes[count])); 28380421a189STahsin Erdogan kfree(*ea_inode_array); 28390421a189STahsin Erdogan *ea_inode_array = new_array; 2840e50e5129SAndreas Dilger } 28410421a189STahsin Erdogan (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; 2842e50e5129SAndreas Dilger return 0; 2843e50e5129SAndreas Dilger } 2844e50e5129SAndreas Dilger 28456dd4ee7cSKalpak Shah /* 2846617ba13bSMingming Cao * ext4_xattr_delete_inode() 2847ac27a0ecSDave Kleikamp * 2848e50e5129SAndreas Dilger * Free extended attribute resources associated with this inode. Traverse 2849dec214d0STahsin Erdogan * all entries and decrement reference on any xattr inodes associated with this 2850dec214d0STahsin Erdogan * inode. This is called immediately before an inode is freed. We have exclusive 2851dec214d0STahsin Erdogan * access to the inode. If an orphan inode is deleted it will also release its 2852dec214d0STahsin Erdogan * references on xattr block and xattr inodes. 2853ac27a0ecSDave Kleikamp */ 2854dec214d0STahsin Erdogan int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, 285530a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 285630a7eb97STahsin Erdogan int extra_credits) 2857ac27a0ecSDave Kleikamp { 2858ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 2859e50e5129SAndreas Dilger struct ext4_xattr_ibody_header *header; 286030a7eb97STahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 2861dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 2862a6d05676STahsin Erdogan struct inode *ea_inode; 286330a7eb97STahsin Erdogan int error; 286430a7eb97STahsin Erdogan 286530a7eb97STahsin Erdogan error = ext4_xattr_ensure_credits(handle, inode, extra_credits, 286630a7eb97STahsin Erdogan NULL /* bh */, 286730a7eb97STahsin Erdogan false /* dirty */, 286830a7eb97STahsin Erdogan false /* block_csum */); 286930a7eb97STahsin Erdogan if (error) { 287030a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); 287130a7eb97STahsin Erdogan goto cleanup; 287230a7eb97STahsin Erdogan } 2873ac27a0ecSDave Kleikamp 2874dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2875dec214d0STahsin Erdogan ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 2876e50e5129SAndreas Dilger 2877e50e5129SAndreas Dilger error = ext4_get_inode_loc(inode, &iloc); 2878dec214d0STahsin Erdogan if (error) { 2879dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); 2880e50e5129SAndreas Dilger goto cleanup; 2881e50e5129SAndreas Dilger } 2882dec214d0STahsin Erdogan 2883dec214d0STahsin Erdogan error = ext4_journal_get_write_access(handle, iloc.bh); 2884dec214d0STahsin Erdogan if (error) { 2885dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "write access (error %d)", 2886dec214d0STahsin Erdogan error); 2887dec214d0STahsin Erdogan goto cleanup; 2888dec214d0STahsin Erdogan } 2889dec214d0STahsin Erdogan 2890dec214d0STahsin Erdogan header = IHDR(inode, ext4_raw_inode(&iloc)); 2891dec214d0STahsin Erdogan if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) 2892dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, 2893dec214d0STahsin Erdogan IFIRST(header), 2894dec214d0STahsin Erdogan false /* block_csum */, 2895dec214d0STahsin Erdogan ea_inode_array, 2896dec214d0STahsin Erdogan extra_credits, 2897dec214d0STahsin Erdogan false /* skip_quota */); 2898dec214d0STahsin Erdogan } 2899dec214d0STahsin Erdogan 2900dec214d0STahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 2901fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2902fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 2903fb265c9cSTheodore Ts'o error = PTR_ERR(bh); 2904fb265c9cSTheodore Ts'o if (error == -EIO) 290524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %llu read error", 290624676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 29077159a986SDan Carpenter bh = NULL; 2908ac27a0ecSDave Kleikamp goto cleanup; 2909ac27a0ecSDave Kleikamp } 2910dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2911de05ca85STheodore Ts'o if (error) 2912ac27a0ecSDave Kleikamp goto cleanup; 2913e50e5129SAndreas Dilger 291430a7eb97STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) { 2915dec214d0STahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 2916a6d05676STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 2917a6d05676STahsin Erdogan if (!entry->e_value_inum) 2918a6d05676STahsin Erdogan continue; 2919a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, 2920a6d05676STahsin Erdogan le32_to_cpu(entry->e_value_inum), 2921a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 2922a6d05676STahsin Erdogan &ea_inode); 2923a6d05676STahsin Erdogan if (error) 2924a6d05676STahsin Erdogan continue; 2925a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, ea_inode, 2926dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 2927a6d05676STahsin Erdogan iput(ea_inode); 2928a6d05676STahsin Erdogan } 2929dec214d0STahsin Erdogan 2930e50e5129SAndreas Dilger } 2931e50e5129SAndreas Dilger 2932dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bh, ea_inode_array, 2933dec214d0STahsin Erdogan extra_credits); 2934dec214d0STahsin Erdogan /* 2935dec214d0STahsin Erdogan * Update i_file_acl value in the same transaction that releases 2936dec214d0STahsin Erdogan * block. 2937dec214d0STahsin Erdogan */ 2938617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 293930a7eb97STahsin Erdogan error = ext4_mark_inode_dirty(handle, inode); 294030a7eb97STahsin Erdogan if (error) { 294130a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", 294230a7eb97STahsin Erdogan error); 294330a7eb97STahsin Erdogan goto cleanup; 294430a7eb97STahsin Erdogan } 2945dec214d0STahsin Erdogan } 2946dec214d0STahsin Erdogan error = 0; 2947ac27a0ecSDave Kleikamp cleanup: 294830a7eb97STahsin Erdogan brelse(iloc.bh); 2949ac27a0ecSDave Kleikamp brelse(bh); 2950e50e5129SAndreas Dilger return error; 2951e50e5129SAndreas Dilger } 2952e50e5129SAndreas Dilger 29530421a189STahsin Erdogan void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) 2954e50e5129SAndreas Dilger { 2955dec214d0STahsin Erdogan int idx; 2956e50e5129SAndreas Dilger 29570421a189STahsin Erdogan if (ea_inode_array == NULL) 2958e50e5129SAndreas Dilger return; 2959e50e5129SAndreas Dilger 2960dec214d0STahsin Erdogan for (idx = 0; idx < ea_inode_array->count; ++idx) 2961dec214d0STahsin Erdogan iput(ea_inode_array->inodes[idx]); 29620421a189STahsin Erdogan kfree(ea_inode_array); 2963ac27a0ecSDave Kleikamp } 2964ac27a0ecSDave Kleikamp 2965ac27a0ecSDave Kleikamp /* 296647387409STahsin Erdogan * ext4_xattr_block_cache_insert() 2967ac27a0ecSDave Kleikamp * 296847387409STahsin Erdogan * Create a new entry in the extended attribute block cache, and insert 2969ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 2970ac27a0ecSDave Kleikamp * 2971ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2972ac27a0ecSDave Kleikamp */ 2973ac27a0ecSDave Kleikamp static void 297447387409STahsin Erdogan ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, 297547387409STahsin Erdogan struct buffer_head *bh) 2976ac27a0ecSDave Kleikamp { 29776048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 29786048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 29796048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 29806048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 2981ac27a0ecSDave Kleikamp int error; 2982ac27a0ecSDave Kleikamp 2983cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 2984cdb7ee4cSTahsin Erdogan return; 298547387409STahsin Erdogan error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, 29866048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 2987ac27a0ecSDave Kleikamp if (error) { 298882939d79SJan Kara if (error == -EBUSY) 2989ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 299082939d79SJan Kara } else 2991ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 2992ac27a0ecSDave Kleikamp } 2993ac27a0ecSDave Kleikamp 2994ac27a0ecSDave Kleikamp /* 2995617ba13bSMingming Cao * ext4_xattr_cmp() 2996ac27a0ecSDave Kleikamp * 2997ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 2998ac27a0ecSDave Kleikamp * 2999ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 3000ac27a0ecSDave Kleikamp * a negative error number on errors. 3001ac27a0ecSDave Kleikamp */ 3002ac27a0ecSDave Kleikamp static int 3003617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 3004617ba13bSMingming Cao struct ext4_xattr_header *header2) 3005ac27a0ecSDave Kleikamp { 3006617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 3007ac27a0ecSDave Kleikamp 3008ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 3009ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 3010ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 3011ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 3012ac27a0ecSDave Kleikamp return 1; 3013ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 3014ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 3015ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 3016ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 3017e50e5129SAndreas Dilger entry1->e_value_inum != entry2->e_value_inum || 3018ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 3019ac27a0ecSDave Kleikamp return 1; 30207cec1918STahsin Erdogan if (!entry1->e_value_inum && 30217cec1918STahsin Erdogan memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 3022ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 3023ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 3024ac27a0ecSDave Kleikamp return 1; 3025ac27a0ecSDave Kleikamp 3026617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 3027617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 3028ac27a0ecSDave Kleikamp } 3029ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 3030ac27a0ecSDave Kleikamp return 1; 3031ac27a0ecSDave Kleikamp return 0; 3032ac27a0ecSDave Kleikamp } 3033ac27a0ecSDave Kleikamp 3034ac27a0ecSDave Kleikamp /* 303547387409STahsin Erdogan * ext4_xattr_block_cache_find() 3036ac27a0ecSDave Kleikamp * 3037ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 3038ac27a0ecSDave Kleikamp * 3039ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 3040ac27a0ecSDave Kleikamp * not found or an error occurred. 3041ac27a0ecSDave Kleikamp */ 3042ac27a0ecSDave Kleikamp static struct buffer_head * 304347387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *inode, 304447387409STahsin Erdogan struct ext4_xattr_header *header, 30457a2508e1SJan Kara struct mb_cache_entry **pce) 3046ac27a0ecSDave Kleikamp { 3047ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 30487a2508e1SJan Kara struct mb_cache_entry *ce; 304947387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 3050ac27a0ecSDave Kleikamp 3051cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 3052cdb7ee4cSTahsin Erdogan return NULL; 3053ac27a0ecSDave Kleikamp if (!header->h_hash) 3054ac27a0ecSDave Kleikamp return NULL; /* never share */ 3055ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 305647387409STahsin Erdogan ce = mb_cache_entry_find_first(ea_block_cache, hash); 3057ac27a0ecSDave Kleikamp while (ce) { 3058ac27a0ecSDave Kleikamp struct buffer_head *bh; 3059ac27a0ecSDave Kleikamp 3060fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, ce->e_value, REQ_PRIO); 3061fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 3062fb265c9cSTheodore Ts'o if (PTR_ERR(bh) == -ENOMEM) 3063fb265c9cSTheodore Ts'o return NULL; 30647159a986SDan Carpenter bh = NULL; 306524676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 3066c07dfcb4STahsin Erdogan (unsigned long)ce->e_value); 3067617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 3068ac27a0ecSDave Kleikamp *pce = ce; 3069ac27a0ecSDave Kleikamp return bh; 3070ac27a0ecSDave Kleikamp } 3071ac27a0ecSDave Kleikamp brelse(bh); 307247387409STahsin Erdogan ce = mb_cache_entry_find_next(ea_block_cache, ce); 3073ac27a0ecSDave Kleikamp } 3074ac27a0ecSDave Kleikamp return NULL; 3075ac27a0ecSDave Kleikamp } 3076ac27a0ecSDave Kleikamp 3077ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 3078ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 3079ac27a0ecSDave Kleikamp 3080ac27a0ecSDave Kleikamp /* 3081617ba13bSMingming Cao * ext4_xattr_hash_entry() 3082ac27a0ecSDave Kleikamp * 3083ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 3084ac27a0ecSDave Kleikamp */ 3085b9fc761eSTahsin Erdogan static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, 3086b9fc761eSTahsin Erdogan size_t value_count) 3087ac27a0ecSDave Kleikamp { 3088ac27a0ecSDave Kleikamp __u32 hash = 0; 3089ac27a0ecSDave Kleikamp 3090b9fc761eSTahsin Erdogan while (name_len--) { 3091ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 3092ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 3093ac27a0ecSDave Kleikamp *name++; 3094ac27a0ecSDave Kleikamp } 3095b9fc761eSTahsin Erdogan while (value_count--) { 3096ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 3097ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 3098ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 3099ac27a0ecSDave Kleikamp } 3100b9fc761eSTahsin Erdogan return cpu_to_le32(hash); 3101ac27a0ecSDave Kleikamp } 3102ac27a0ecSDave Kleikamp 3103ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 3104ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 3105ac27a0ecSDave Kleikamp 3106ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 3107ac27a0ecSDave Kleikamp 3108ac27a0ecSDave Kleikamp /* 3109617ba13bSMingming Cao * ext4_xattr_rehash() 3110ac27a0ecSDave Kleikamp * 3111ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 3112ac27a0ecSDave Kleikamp */ 3113daf83281STahsin Erdogan static void ext4_xattr_rehash(struct ext4_xattr_header *header) 3114ac27a0ecSDave Kleikamp { 3115617ba13bSMingming Cao struct ext4_xattr_entry *here; 3116ac27a0ecSDave Kleikamp __u32 hash = 0; 3117ac27a0ecSDave Kleikamp 3118ac27a0ecSDave Kleikamp here = ENTRY(header+1); 3119ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 3120ac27a0ecSDave Kleikamp if (!here->e_hash) { 3121ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 3122ac27a0ecSDave Kleikamp hash = 0; 3123ac27a0ecSDave Kleikamp break; 3124ac27a0ecSDave Kleikamp } 3125ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 3126ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 3127ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 3128617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 3129ac27a0ecSDave Kleikamp } 3130ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 3131ac27a0ecSDave Kleikamp } 3132ac27a0ecSDave Kleikamp 3133ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 3134ac27a0ecSDave Kleikamp 31359c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 31369c191f70ST Makphaibulchoke 31377a2508e1SJan Kara struct mb_cache * 313882939d79SJan Kara ext4_xattr_create_cache(void) 3139ac27a0ecSDave Kleikamp { 31407a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 3141ac27a0ecSDave Kleikamp } 3142ac27a0ecSDave Kleikamp 31437a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 3144ac27a0ecSDave Kleikamp { 31459c191f70ST Makphaibulchoke if (cache) 31467a2508e1SJan Kara mb_cache_destroy(cache); 3147ac27a0ecSDave Kleikamp } 31489c191f70ST Makphaibulchoke 3149