1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 2ac27a0ecSDave Kleikamp /* 3617ba13bSMingming Cao * linux/fs/ext4/dir.c 4ac27a0ecSDave Kleikamp * 5ac27a0ecSDave Kleikamp * Copyright (C) 1992, 1993, 1994, 1995 6ac27a0ecSDave Kleikamp * Remy Card (card@masi.ibp.fr) 7ac27a0ecSDave Kleikamp * Laboratoire MASI - Institut Blaise Pascal 8ac27a0ecSDave Kleikamp * Universite Pierre et Marie Curie (Paris VI) 9ac27a0ecSDave Kleikamp * 10ac27a0ecSDave Kleikamp * from 11ac27a0ecSDave Kleikamp * 12ac27a0ecSDave Kleikamp * linux/fs/minix/dir.c 13ac27a0ecSDave Kleikamp * 14ac27a0ecSDave Kleikamp * Copyright (C) 1991, 1992 Linus Torvalds 15ac27a0ecSDave Kleikamp * 16617ba13bSMingming Cao * ext4 directory handling functions 17ac27a0ecSDave Kleikamp * 18ac27a0ecSDave Kleikamp * Big-endian to little-endian byte-swapping/bitmaps by 19ac27a0ecSDave Kleikamp * David S. Miller (davem@caip.rutgers.edu), 1995 20ac27a0ecSDave Kleikamp * 21ac27a0ecSDave Kleikamp * Hash Tree Directory indexing (c) 2001 Daniel Phillips 22ac27a0ecSDave Kleikamp * 23ac27a0ecSDave Kleikamp */ 24ac27a0ecSDave Kleikamp 25ac27a0ecSDave Kleikamp #include <linux/fs.h> 26ac27a0ecSDave Kleikamp #include <linux/buffer_head.h> 27ac27a0ecSDave Kleikamp #include <linux/slab.h> 28ee73f9a5SJeff Layton #include <linux/iversion.h> 29b886ee3eSGabriel Krisman Bertazi #include <linux/unicode.h> 303dcf5451SChristoph Hellwig #include "ext4.h" 3165d165d9STao Ma #include "xattr.h" 32ac27a0ecSDave Kleikamp 33725bebb2SAl Viro static int ext4_dx_readdir(struct file *, struct dir_context *); 34ac27a0ecSDave Kleikamp 35d1f5273eSFan Yong /** 36c60990b3STheodore Ts'o * is_dx_dir() - check if a directory is using htree indexing 37c60990b3STheodore Ts'o * @inode: directory inode 38c60990b3STheodore Ts'o * 39d1f5273eSFan Yong * Check if the given dir-inode refers to an htree-indexed directory 4070261f56SAnatol Pomozov * (or a directory which could potentially get converted to use htree 41d1f5273eSFan Yong * indexing). 42d1f5273eSFan Yong * 43d1f5273eSFan Yong * Return 1 if it is a dx dir, 0 if not 44d1f5273eSFan Yong */ 45d1f5273eSFan Yong static int is_dx_dir(struct inode *inode) 46d1f5273eSFan Yong { 47d1f5273eSFan Yong struct super_block *sb = inode->i_sb; 48d1f5273eSFan Yong 49e2b911c5SDarrick J. Wong if (ext4_has_feature_dir_index(inode->i_sb) && 50d1f5273eSFan Yong ((ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) || 518af0f082STao Ma ((inode->i_size >> sb->s_blocksize_bits) == 1) || 528af0f082STao Ma ext4_has_inline_data(inode))) 53d1f5273eSFan Yong return 1; 54d1f5273eSFan Yong 55d1f5273eSFan Yong return 0; 56d1f5273eSFan Yong } 57d1f5273eSFan Yong 58cad3f007STheodore Ts'o /* 59cad3f007STheodore Ts'o * Return 0 if the directory entry is OK, and 1 if there is a problem 60cad3f007STheodore Ts'o * 61cad3f007STheodore Ts'o * Note: this is the opposite of what ext2 and ext3 historically returned... 6265d165d9STao Ma * 6365d165d9STao Ma * bh passed here can be an inode block or a dir data block, depending 6465d165d9STao Ma * on the inode inline data flag. 65cad3f007STheodore Ts'o */ 6660fd4da3STheodore Ts'o int __ext4_check_dir_entry(const char *function, unsigned int line, 67f7c21177STheodore Ts'o struct inode *dir, struct file *filp, 68617ba13bSMingming Cao struct ext4_dir_entry_2 *de, 69226ba972STao Ma struct buffer_head *bh, char *buf, int size, 70498e5f24STheodore Ts'o unsigned int offset) 71ac27a0ecSDave Kleikamp { 72ac27a0ecSDave Kleikamp const char *error_msg = NULL; 733d0518f4SWei Yongjun const int rlen = ext4_rec_len_from_disk(de->rec_len, 743d0518f4SWei Yongjun dir->i_sb->s_blocksize); 75707d1a2fSTheodore Ts'o const int next_offset = ((char *) de - buf) + rlen; 76ac27a0ecSDave Kleikamp 77cad3f007STheodore Ts'o if (unlikely(rlen < EXT4_DIR_REC_LEN(1))) 78ac27a0ecSDave Kleikamp error_msg = "rec_len is smaller than minimal"; 79cad3f007STheodore Ts'o else if (unlikely(rlen % 4 != 0)) 80ac27a0ecSDave Kleikamp error_msg = "rec_len % 4 != 0"; 81cad3f007STheodore Ts'o else if (unlikely(rlen < EXT4_DIR_REC_LEN(de->name_len))) 82ac27a0ecSDave Kleikamp error_msg = "rec_len is too small for name_len"; 83707d1a2fSTheodore Ts'o else if (unlikely(next_offset > size)) 844d982e25STheodore Ts'o error_msg = "directory entry overrun"; 85707d1a2fSTheodore Ts'o else if (unlikely(next_offset > size - EXT4_DIR_REC_LEN(1) && 86707d1a2fSTheodore Ts'o next_offset != size)) 87109ba779SJan Kara error_msg = "directory entry too close to block end"; 88cad3f007STheodore Ts'o else if (unlikely(le32_to_cpu(de->inode) > 89cad3f007STheodore Ts'o le32_to_cpu(EXT4_SB(dir->i_sb)->s_es->s_inodes_count))) 90ac27a0ecSDave Kleikamp error_msg = "inode out of bounds"; 91cad3f007STheodore Ts'o else 92cad3f007STheodore Ts'o return 0; 93ac27a0ecSDave Kleikamp 94f7c21177STheodore Ts'o if (filp) 954fda4003SDan Carpenter ext4_error_file(filp, function, line, bh->b_blocknr, 964d982e25STheodore Ts'o "bad entry in directory: %s - offset=%u, " 974d982e25STheodore Ts'o "inode=%u, rec_len=%d, name_len=%d, size=%d", 984d982e25STheodore Ts'o error_msg, offset, le32_to_cpu(de->inode), 994d982e25STheodore Ts'o rlen, de->name_len, size); 100f7c21177STheodore Ts'o else 1014fda4003SDan Carpenter ext4_error_inode(dir, function, line, bh->b_blocknr, 1024d982e25STheodore Ts'o "bad entry in directory: %s - offset=%u, " 1034d982e25STheodore Ts'o "inode=%u, rec_len=%d, name_len=%d, size=%d", 1044d982e25STheodore Ts'o error_msg, offset, le32_to_cpu(de->inode), 1054d982e25STheodore Ts'o rlen, de->name_len, size); 106f7c21177STheodore Ts'o 107cad3f007STheodore Ts'o return 1; 108ac27a0ecSDave Kleikamp } 109ac27a0ecSDave Kleikamp 110725bebb2SAl Viro static int ext4_readdir(struct file *file, struct dir_context *ctx) 111ac27a0ecSDave Kleikamp { 112498e5f24STheodore Ts'o unsigned int offset; 113aa13d5f6SGiedrius Rekasius int i; 114617ba13bSMingming Cao struct ext4_dir_entry_2 *de; 115ac27a0ecSDave Kleikamp int err; 116725bebb2SAl Viro struct inode *inode = file_inode(file); 117d1f5273eSFan Yong struct super_block *sb = inode->i_sb; 11844614711SMichael Halcrow struct buffer_head *bh = NULL; 119a7550b30SJaegeuk Kim struct fscrypt_str fstr = FSTR_INIT(NULL, 0); 120ac27a0ecSDave Kleikamp 121592ddec7SChandan Rajendra if (IS_ENCRYPTED(inode)) { 122a7550b30SJaegeuk Kim err = fscrypt_get_encryption_info(inode); 1233b1ada55SEric Biggers if (err) 12428b4c263STheodore Ts'o return err; 12528b4c263STheodore Ts'o } 12628b4c263STheodore Ts'o 127d1f5273eSFan Yong if (is_dx_dir(inode)) { 128725bebb2SAl Viro err = ext4_dx_readdir(file, ctx); 129ac27a0ecSDave Kleikamp if (err != ERR_BAD_DX_DIR) { 130725bebb2SAl Viro return err; 131ac27a0ecSDave Kleikamp } 13248a34311SJan Kara /* Can we just clear INDEX flag to ignore htree information? */ 13348a34311SJan Kara if (!ext4_has_metadata_csum(sb)) { 134ac27a0ecSDave Kleikamp /* 135ac27a0ecSDave Kleikamp * We don't set the inode dirty flag since it's not 13648a34311SJan Kara * critical that it gets flushed back to the disk. 137ac27a0ecSDave Kleikamp */ 13848a34311SJan Kara ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 13948a34311SJan Kara } 140ac27a0ecSDave Kleikamp } 1418af0f082STao Ma 1428af0f082STao Ma if (ext4_has_inline_data(inode)) { 1438af0f082STao Ma int has_inline_data = 1; 14444614711SMichael Halcrow err = ext4_read_inline_dir(file, ctx, 1458af0f082STao Ma &has_inline_data); 1468af0f082STao Ma if (has_inline_data) 14744614711SMichael Halcrow return err; 14844614711SMichael Halcrow } 14944614711SMichael Halcrow 150592ddec7SChandan Rajendra if (IS_ENCRYPTED(inode)) { 1518b10fe68SJeff Layton err = fscrypt_fname_alloc_buffer(EXT4_NAME_LEN, &fstr); 152b7236e21STheodore Ts'o if (err < 0) 153b7236e21STheodore Ts'o return err; 1548af0f082STao Ma } 1558af0f082STao Ma 156725bebb2SAl Viro while (ctx->pos < inode->i_size) { 1572ed88685STheodore Ts'o struct ext4_map_blocks map; 158ac27a0ecSDave Kleikamp 1591f60fbe7STheodore Ts'o if (fatal_signal_pending(current)) { 1601f60fbe7STheodore Ts'o err = -ERESTARTSYS; 1611f60fbe7STheodore Ts'o goto errout; 1621f60fbe7STheodore Ts'o } 1631f60fbe7STheodore Ts'o cond_resched(); 1644e19d6b6STheodore Ts'o offset = ctx->pos & (sb->s_blocksize - 1); 165725bebb2SAl Viro map.m_lblk = ctx->pos >> EXT4_BLOCK_SIZE_BITS(sb); 1662ed88685STheodore Ts'o map.m_len = 1; 1672ed88685STheodore Ts'o err = ext4_map_blocks(NULL, inode, &map, 0); 1684e19d6b6STheodore Ts'o if (err == 0) { 1694e19d6b6STheodore Ts'o /* m_len should never be zero but let's avoid 1704e19d6b6STheodore Ts'o * an infinite loop if it somehow is */ 1714e19d6b6STheodore Ts'o if (map.m_len == 0) 1724e19d6b6STheodore Ts'o map.m_len = 1; 1734e19d6b6STheodore Ts'o ctx->pos += map.m_len * sb->s_blocksize; 1744e19d6b6STheodore Ts'o continue; 1754e19d6b6STheodore Ts'o } 176ac27a0ecSDave Kleikamp if (err > 0) { 1772ed88685STheodore Ts'o pgoff_t index = map.m_pblk >> 17809cbfeafSKirill A. Shutemov (PAGE_SHIFT - inode->i_blkbits); 179725bebb2SAl Viro if (!ra_has_index(&file->f_ra, index)) 180cf914a7dSRusty Russell page_cache_sync_readahead( 181dc7868fcSFengguang Wu sb->s_bdev->bd_inode->i_mapping, 182725bebb2SAl Viro &file->f_ra, file, 183cf914a7dSRusty Russell index, 1); 18409cbfeafSKirill A. Shutemov file->f_ra.prev_pos = (loff_t)index << PAGE_SHIFT; 1851c215028STheodore Ts'o bh = ext4_bread(NULL, inode, map.m_lblk, 0); 186c906f38eSKirill Tkhai if (IS_ERR(bh)) { 187c906f38eSKirill Tkhai err = PTR_ERR(bh); 188c906f38eSKirill Tkhai bh = NULL; 189c906f38eSKirill Tkhai goto errout; 190c906f38eSKirill Tkhai } 191ac27a0ecSDave Kleikamp } 192ac27a0ecSDave Kleikamp 193ac27a0ecSDave Kleikamp if (!bh) { 194e6c40211SEric Sandeen /* corrupt size? Maybe no more blocks to read */ 195725bebb2SAl Viro if (ctx->pos > inode->i_blocks << 9) 196e6c40211SEric Sandeen break; 197725bebb2SAl Viro ctx->pos += sb->s_blocksize - offset; 198ac27a0ecSDave Kleikamp continue; 199ac27a0ecSDave Kleikamp } 200ac27a0ecSDave Kleikamp 201b0336e8dSDarrick J. Wong /* Check the checksum */ 202b0336e8dSDarrick J. Wong if (!buffer_verified(bh) && 203f036adb3STheodore Ts'o !ext4_dirblock_csum_verify(inode, bh)) { 204725bebb2SAl Viro EXT4_ERROR_FILE(file, 0, "directory fails checksum " 205b0336e8dSDarrick J. Wong "at offset %llu", 206725bebb2SAl Viro (unsigned long long)ctx->pos); 207725bebb2SAl Viro ctx->pos += sb->s_blocksize - offset; 208d5ac7773SGuo Chao brelse(bh); 20944614711SMichael Halcrow bh = NULL; 210b0336e8dSDarrick J. Wong continue; 211b0336e8dSDarrick J. Wong } 212b0336e8dSDarrick J. Wong set_buffer_verified(bh); 213b0336e8dSDarrick J. Wong 214ac27a0ecSDave Kleikamp /* If the dir block has changed since the last call to 215ac27a0ecSDave Kleikamp * readdir(2), then we might be pointing to an invalid 216ac27a0ecSDave Kleikamp * dirent right now. Scan from the start of the block 217ac27a0ecSDave Kleikamp * to make sure. */ 218c472c07bSGoffredo Baroncelli if (!inode_eq_iversion(inode, file->f_version)) { 219ac27a0ecSDave Kleikamp for (i = 0; i < sb->s_blocksize && i < offset; ) { 220617ba13bSMingming Cao de = (struct ext4_dir_entry_2 *) 221ac27a0ecSDave Kleikamp (bh->b_data + i); 222ac27a0ecSDave Kleikamp /* It's too expensive to do a full 223ac27a0ecSDave Kleikamp * dirent test each time round this 224ac27a0ecSDave Kleikamp * loop, but we do have to test at 225ac27a0ecSDave Kleikamp * least that it is non-zero. A 226ac27a0ecSDave Kleikamp * failure will be detected in the 227ac27a0ecSDave Kleikamp * dirent test below. */ 2283d0518f4SWei Yongjun if (ext4_rec_len_from_disk(de->rec_len, 2293d0518f4SWei Yongjun sb->s_blocksize) < EXT4_DIR_REC_LEN(1)) 230ac27a0ecSDave Kleikamp break; 2313d0518f4SWei Yongjun i += ext4_rec_len_from_disk(de->rec_len, 2323d0518f4SWei Yongjun sb->s_blocksize); 233ac27a0ecSDave Kleikamp } 234ac27a0ecSDave Kleikamp offset = i; 235725bebb2SAl Viro ctx->pos = (ctx->pos & ~(sb->s_blocksize - 1)) 236ac27a0ecSDave Kleikamp | offset; 237ee73f9a5SJeff Layton file->f_version = inode_query_iversion(inode); 238ac27a0ecSDave Kleikamp } 239ac27a0ecSDave Kleikamp 240725bebb2SAl Viro while (ctx->pos < inode->i_size 241ac27a0ecSDave Kleikamp && offset < sb->s_blocksize) { 242617ba13bSMingming Cao de = (struct ext4_dir_entry_2 *) (bh->b_data + offset); 243725bebb2SAl Viro if (ext4_check_dir_entry(inode, file, de, bh, 244226ba972STao Ma bh->b_data, bh->b_size, 245226ba972STao Ma offset)) { 24663f57933SAndrew Morton /* 247725bebb2SAl Viro * On error, skip to the next block 24863f57933SAndrew Morton */ 249725bebb2SAl Viro ctx->pos = (ctx->pos | 250ac27a0ecSDave Kleikamp (sb->s_blocksize - 1)) + 1; 251725bebb2SAl Viro break; 252ac27a0ecSDave Kleikamp } 2533d0518f4SWei Yongjun offset += ext4_rec_len_from_disk(de->rec_len, 2543d0518f4SWei Yongjun sb->s_blocksize); 255ac27a0ecSDave Kleikamp if (le32_to_cpu(de->inode)) { 256592ddec7SChandan Rajendra if (!IS_ENCRYPTED(inode)) { 257725bebb2SAl Viro if (!dir_emit(ctx, de->name, 258ac27a0ecSDave Kleikamp de->name_len, 259ac27a0ecSDave Kleikamp le32_to_cpu(de->inode), 26044614711SMichael Halcrow get_dtype(sb, de->file_type))) 26144614711SMichael Halcrow goto done; 26244614711SMichael Halcrow } else { 263a7550b30SJaegeuk Kim int save_len = fstr.len; 264a7550b30SJaegeuk Kim struct fscrypt_str de_name = 265a7550b30SJaegeuk Kim FSTR_INIT(de->name, 266a7550b30SJaegeuk Kim de->name_len); 267d2299590STheodore Ts'o 26844614711SMichael Halcrow /* Directory is encrypted */ 269a7550b30SJaegeuk Kim err = fscrypt_fname_disk_to_usr(inode, 270a7550b30SJaegeuk Kim 0, 0, &de_name, &fstr); 271ef1eb3aaSEric Biggers de_name = fstr; 272a7550b30SJaegeuk Kim fstr.len = save_len; 273ef1eb3aaSEric Biggers if (err) 27444614711SMichael Halcrow goto errout; 27544614711SMichael Halcrow if (!dir_emit(ctx, 276ef1eb3aaSEric Biggers de_name.name, de_name.len, 27744614711SMichael Halcrow le32_to_cpu(de->inode), 27844614711SMichael Halcrow get_dtype(sb, de->file_type))) 27944614711SMichael Halcrow goto done; 280ac27a0ecSDave Kleikamp } 281725bebb2SAl Viro } 282725bebb2SAl Viro ctx->pos += ext4_rec_len_from_disk(de->rec_len, 2833d0518f4SWei Yongjun sb->s_blocksize); 284ac27a0ecSDave Kleikamp } 285ae05327aSAl Viro if ((ctx->pos < inode->i_size) && !dir_relax_shared(inode)) 28644614711SMichael Halcrow goto done; 287ac27a0ecSDave Kleikamp brelse(bh); 28844614711SMichael Halcrow bh = NULL; 28944614711SMichael Halcrow offset = 0; 290ac27a0ecSDave Kleikamp } 29144614711SMichael Halcrow done: 29244614711SMichael Halcrow err = 0; 29344614711SMichael Halcrow errout: 294a7550b30SJaegeuk Kim fscrypt_fname_free_buffer(&fstr); 29544614711SMichael Halcrow brelse(bh); 29644614711SMichael Halcrow return err; 297ac27a0ecSDave Kleikamp } 298ac27a0ecSDave Kleikamp 299d1f5273eSFan Yong static inline int is_32bit_api(void) 300d1f5273eSFan Yong { 301d1f5273eSFan Yong #ifdef CONFIG_COMPAT 302121cef8fSAndy Lutomirski return in_compat_syscall(); 303d1f5273eSFan Yong #else 304d1f5273eSFan Yong return (BITS_PER_LONG == 32); 305d1f5273eSFan Yong #endif 306d1f5273eSFan Yong } 307d1f5273eSFan Yong 308ac27a0ecSDave Kleikamp /* 309ac27a0ecSDave Kleikamp * These functions convert from the major/minor hash to an f_pos 310d1f5273eSFan Yong * value for dx directories 311ac27a0ecSDave Kleikamp * 312d1f5273eSFan Yong * Upper layer (for example NFS) should specify FMODE_32BITHASH or 313d1f5273eSFan Yong * FMODE_64BITHASH explicitly. On the other hand, we allow ext4 to be mounted 314d1f5273eSFan Yong * directly on both 32-bit and 64-bit nodes, under such case, neither 315d1f5273eSFan Yong * FMODE_32BITHASH nor FMODE_64BITHASH is specified. 316ac27a0ecSDave Kleikamp */ 317d1f5273eSFan Yong static inline loff_t hash2pos(struct file *filp, __u32 major, __u32 minor) 318d1f5273eSFan Yong { 319d1f5273eSFan Yong if ((filp->f_mode & FMODE_32BITHASH) || 320d1f5273eSFan Yong (!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api())) 321d1f5273eSFan Yong return major >> 1; 322d1f5273eSFan Yong else 323d1f5273eSFan Yong return ((__u64)(major >> 1) << 32) | (__u64)minor; 324d1f5273eSFan Yong } 325d1f5273eSFan Yong 326d1f5273eSFan Yong static inline __u32 pos2maj_hash(struct file *filp, loff_t pos) 327d1f5273eSFan Yong { 328d1f5273eSFan Yong if ((filp->f_mode & FMODE_32BITHASH) || 329d1f5273eSFan Yong (!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api())) 330d1f5273eSFan Yong return (pos << 1) & 0xffffffff; 331d1f5273eSFan Yong else 332d1f5273eSFan Yong return ((pos >> 32) << 1) & 0xffffffff; 333d1f5273eSFan Yong } 334d1f5273eSFan Yong 335d1f5273eSFan Yong static inline __u32 pos2min_hash(struct file *filp, loff_t pos) 336d1f5273eSFan Yong { 337d1f5273eSFan Yong if ((filp->f_mode & FMODE_32BITHASH) || 338d1f5273eSFan Yong (!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api())) 339d1f5273eSFan Yong return 0; 340d1f5273eSFan Yong else 341d1f5273eSFan Yong return pos & 0xffffffff; 342d1f5273eSFan Yong } 343d1f5273eSFan Yong 344d1f5273eSFan Yong /* 345d1f5273eSFan Yong * Return 32- or 64-bit end-of-file for dx directories 346d1f5273eSFan Yong */ 347d1f5273eSFan Yong static inline loff_t ext4_get_htree_eof(struct file *filp) 348d1f5273eSFan Yong { 349d1f5273eSFan Yong if ((filp->f_mode & FMODE_32BITHASH) || 350d1f5273eSFan Yong (!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api())) 351d1f5273eSFan Yong return EXT4_HTREE_EOF_32BIT; 352d1f5273eSFan Yong else 353d1f5273eSFan Yong return EXT4_HTREE_EOF_64BIT; 354d1f5273eSFan Yong } 355d1f5273eSFan Yong 356d1f5273eSFan Yong 357d1f5273eSFan Yong /* 358ec7268ceSEric Sandeen * ext4_dir_llseek() calls generic_file_llseek_size to handle htree 359ec7268ceSEric Sandeen * directories, where the "offset" is in terms of the filename hash 360ec7268ceSEric Sandeen * value instead of the byte offset. 361d1f5273eSFan Yong * 362ec7268ceSEric Sandeen * Because we may return a 64-bit hash that is well beyond offset limits, 363ec7268ceSEric Sandeen * we need to pass the max hash as the maximum allowable offset in 364ec7268ceSEric Sandeen * the htree directory case. 365ec7268ceSEric Sandeen * 366ec7268ceSEric Sandeen * For non-htree, ext4_llseek already chooses the proper max offset. 367d1f5273eSFan Yong */ 368d4e43954SZheng Liu static loff_t ext4_dir_llseek(struct file *file, loff_t offset, int whence) 369d1f5273eSFan Yong { 370d1f5273eSFan Yong struct inode *inode = file->f_mapping->host; 371d1f5273eSFan Yong int dx_dir = is_dx_dir(inode); 372e40ff213STheodore Ts'o loff_t ret, htree_max = ext4_get_htree_eof(file); 373d1f5273eSFan Yong 374ec7268ceSEric Sandeen if (likely(dx_dir)) 375e40ff213STheodore Ts'o ret = generic_file_llseek_size(file, offset, whence, 376ec7268ceSEric Sandeen htree_max, htree_max); 377d1f5273eSFan Yong else 378e40ff213STheodore Ts'o ret = ext4_llseek(file, offset, whence); 379e40ff213STheodore Ts'o file->f_version = inode_peek_iversion(inode) - 1; 380e40ff213STheodore Ts'o return ret; 381d1f5273eSFan Yong } 382ac27a0ecSDave Kleikamp 383ac27a0ecSDave Kleikamp /* 384ac27a0ecSDave Kleikamp * This structure holds the nodes of the red-black tree used to store 385ac27a0ecSDave Kleikamp * the directory entry in hash order. 386ac27a0ecSDave Kleikamp */ 387ac27a0ecSDave Kleikamp struct fname { 388ac27a0ecSDave Kleikamp __u32 hash; 389ac27a0ecSDave Kleikamp __u32 minor_hash; 390ac27a0ecSDave Kleikamp struct rb_node rb_hash; 391ac27a0ecSDave Kleikamp struct fname *next; 392ac27a0ecSDave Kleikamp __u32 inode; 393ac27a0ecSDave Kleikamp __u8 name_len; 394ac27a0ecSDave Kleikamp __u8 file_type; 395e32ac245SGustavo A. R. Silva char name[]; 396ac27a0ecSDave Kleikamp }; 397ac27a0ecSDave Kleikamp 398ac27a0ecSDave Kleikamp /* 399ac27a0ecSDave Kleikamp * This functoin implements a non-recursive way of freeing all of the 400ac27a0ecSDave Kleikamp * nodes in the red-black tree. 401ac27a0ecSDave Kleikamp */ 402ac27a0ecSDave Kleikamp static void free_rb_tree_fname(struct rb_root *root) 403ac27a0ecSDave Kleikamp { 404d1866bd0SCody P Schafer struct fname *fname, *next; 405ac27a0ecSDave Kleikamp 406d1866bd0SCody P Schafer rbtree_postorder_for_each_entry_safe(fname, next, root, rb_hash) 407ac27a0ecSDave Kleikamp while (fname) { 408ac27a0ecSDave Kleikamp struct fname *old = fname; 409ac27a0ecSDave Kleikamp fname = fname->next; 410ac27a0ecSDave Kleikamp kfree(old); 411ac27a0ecSDave Kleikamp } 412d1866bd0SCody P Schafer 41364e290ecSVenkatesh Pallipadi *root = RB_ROOT; 414ac27a0ecSDave Kleikamp } 415ac27a0ecSDave Kleikamp 416ac27a0ecSDave Kleikamp 417d1f5273eSFan Yong static struct dir_private_info *ext4_htree_create_dir_info(struct file *filp, 418d1f5273eSFan Yong loff_t pos) 419ac27a0ecSDave Kleikamp { 420ac27a0ecSDave Kleikamp struct dir_private_info *p; 421ac27a0ecSDave Kleikamp 422d695a1beSMarkus Elfring p = kzalloc(sizeof(*p), GFP_KERNEL); 423ac27a0ecSDave Kleikamp if (!p) 424ac27a0ecSDave Kleikamp return NULL; 425d1f5273eSFan Yong p->curr_hash = pos2maj_hash(filp, pos); 426d1f5273eSFan Yong p->curr_minor_hash = pos2min_hash(filp, pos); 427ac27a0ecSDave Kleikamp return p; 428ac27a0ecSDave Kleikamp } 429ac27a0ecSDave Kleikamp 430617ba13bSMingming Cao void ext4_htree_free_dir_info(struct dir_private_info *p) 431ac27a0ecSDave Kleikamp { 432ac27a0ecSDave Kleikamp free_rb_tree_fname(&p->root); 433ac27a0ecSDave Kleikamp kfree(p); 434ac27a0ecSDave Kleikamp } 435ac27a0ecSDave Kleikamp 436ac27a0ecSDave Kleikamp /* 437ac27a0ecSDave Kleikamp * Given a directory entry, enter it into the fname rb tree. 4382f61830aSTheodore Ts'o * 4392f61830aSTheodore Ts'o * When filename encryption is enabled, the dirent will hold the 4402f61830aSTheodore Ts'o * encrypted filename, while the htree will hold decrypted filename. 4412f61830aSTheodore Ts'o * The decrypted filename is passed in via ent_name. parameter. 442ac27a0ecSDave Kleikamp */ 443617ba13bSMingming Cao int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 444ac27a0ecSDave Kleikamp __u32 minor_hash, 4452f61830aSTheodore Ts'o struct ext4_dir_entry_2 *dirent, 446a7550b30SJaegeuk Kim struct fscrypt_str *ent_name) 447ac27a0ecSDave Kleikamp { 448ac27a0ecSDave Kleikamp struct rb_node **p, *parent = NULL; 449ac27a0ecSDave Kleikamp struct fname *fname, *new_fn; 450ac27a0ecSDave Kleikamp struct dir_private_info *info; 451ac27a0ecSDave Kleikamp int len; 452ac27a0ecSDave Kleikamp 453a271fe85SJoe Perches info = dir_file->private_data; 454ac27a0ecSDave Kleikamp p = &info->root.rb_node; 455ac27a0ecSDave Kleikamp 456ac27a0ecSDave Kleikamp /* Create and allocate the fname structure */ 4572f61830aSTheodore Ts'o len = sizeof(struct fname) + ent_name->len + 1; 458ac27a0ecSDave Kleikamp new_fn = kzalloc(len, GFP_KERNEL); 459ac27a0ecSDave Kleikamp if (!new_fn) 460ac27a0ecSDave Kleikamp return -ENOMEM; 461ac27a0ecSDave Kleikamp new_fn->hash = hash; 462ac27a0ecSDave Kleikamp new_fn->minor_hash = minor_hash; 463ac27a0ecSDave Kleikamp new_fn->inode = le32_to_cpu(dirent->inode); 4642f61830aSTheodore Ts'o new_fn->name_len = ent_name->len; 465ac27a0ecSDave Kleikamp new_fn->file_type = dirent->file_type; 4662f61830aSTheodore Ts'o memcpy(new_fn->name, ent_name->name, ent_name->len); 467ac27a0ecSDave Kleikamp 468ac27a0ecSDave Kleikamp while (*p) { 469ac27a0ecSDave Kleikamp parent = *p; 470ac27a0ecSDave Kleikamp fname = rb_entry(parent, struct fname, rb_hash); 471ac27a0ecSDave Kleikamp 472ac27a0ecSDave Kleikamp /* 473ac27a0ecSDave Kleikamp * If the hash and minor hash match up, then we put 474ac27a0ecSDave Kleikamp * them on a linked list. This rarely happens... 475ac27a0ecSDave Kleikamp */ 476ac27a0ecSDave Kleikamp if ((new_fn->hash == fname->hash) && 477ac27a0ecSDave Kleikamp (new_fn->minor_hash == fname->minor_hash)) { 478ac27a0ecSDave Kleikamp new_fn->next = fname->next; 479ac27a0ecSDave Kleikamp fname->next = new_fn; 480ac27a0ecSDave Kleikamp return 0; 481ac27a0ecSDave Kleikamp } 482ac27a0ecSDave Kleikamp 483ac27a0ecSDave Kleikamp if (new_fn->hash < fname->hash) 484ac27a0ecSDave Kleikamp p = &(*p)->rb_left; 485ac27a0ecSDave Kleikamp else if (new_fn->hash > fname->hash) 486ac27a0ecSDave Kleikamp p = &(*p)->rb_right; 487ac27a0ecSDave Kleikamp else if (new_fn->minor_hash < fname->minor_hash) 488ac27a0ecSDave Kleikamp p = &(*p)->rb_left; 489ac27a0ecSDave Kleikamp else /* if (new_fn->minor_hash > fname->minor_hash) */ 490ac27a0ecSDave Kleikamp p = &(*p)->rb_right; 491ac27a0ecSDave Kleikamp } 492ac27a0ecSDave Kleikamp 493ac27a0ecSDave Kleikamp rb_link_node(&new_fn->rb_hash, parent, p); 494ac27a0ecSDave Kleikamp rb_insert_color(&new_fn->rb_hash, &info->root); 495ac27a0ecSDave Kleikamp return 0; 496ac27a0ecSDave Kleikamp } 497ac27a0ecSDave Kleikamp 498ac27a0ecSDave Kleikamp 499ac27a0ecSDave Kleikamp 500ac27a0ecSDave Kleikamp /* 501617ba13bSMingming Cao * This is a helper function for ext4_dx_readdir. It calls filldir 502ac27a0ecSDave Kleikamp * for all entres on the fname linked list. (Normally there is only 503ac27a0ecSDave Kleikamp * one entry on the linked list, unless there are 62 bit hash collisions.) 504ac27a0ecSDave Kleikamp */ 505725bebb2SAl Viro static int call_filldir(struct file *file, struct dir_context *ctx, 506725bebb2SAl Viro struct fname *fname) 507ac27a0ecSDave Kleikamp { 508725bebb2SAl Viro struct dir_private_info *info = file->private_data; 509725bebb2SAl Viro struct inode *inode = file_inode(file); 510725bebb2SAl Viro struct super_block *sb = inode->i_sb; 511ac27a0ecSDave Kleikamp 512ac27a0ecSDave Kleikamp if (!fname) { 51392b97816STheodore Ts'o ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: comm %s: " 51492b97816STheodore Ts'o "called with null fname?!?", __func__, __LINE__, 51592b97816STheodore Ts'o inode->i_ino, current->comm); 516ac27a0ecSDave Kleikamp return 0; 517ac27a0ecSDave Kleikamp } 518725bebb2SAl Viro ctx->pos = hash2pos(file, fname->hash, fname->minor_hash); 519ac27a0ecSDave Kleikamp while (fname) { 520725bebb2SAl Viro if (!dir_emit(ctx, fname->name, 521725bebb2SAl Viro fname->name_len, 522ac27a0ecSDave Kleikamp fname->inode, 523725bebb2SAl Viro get_dtype(sb, fname->file_type))) { 524d0156417STheodore Ts'o info->extra_fname = fname; 525725bebb2SAl Viro return 1; 526ac27a0ecSDave Kleikamp } 527ac27a0ecSDave Kleikamp fname = fname->next; 528ac27a0ecSDave Kleikamp } 529ac27a0ecSDave Kleikamp return 0; 530ac27a0ecSDave Kleikamp } 531ac27a0ecSDave Kleikamp 532725bebb2SAl Viro static int ext4_dx_readdir(struct file *file, struct dir_context *ctx) 533ac27a0ecSDave Kleikamp { 534725bebb2SAl Viro struct dir_private_info *info = file->private_data; 535725bebb2SAl Viro struct inode *inode = file_inode(file); 536ac27a0ecSDave Kleikamp struct fname *fname; 537ac27a0ecSDave Kleikamp int ret; 538ac27a0ecSDave Kleikamp 539ac27a0ecSDave Kleikamp if (!info) { 540725bebb2SAl Viro info = ext4_htree_create_dir_info(file, ctx->pos); 541ac27a0ecSDave Kleikamp if (!info) 542ac27a0ecSDave Kleikamp return -ENOMEM; 543725bebb2SAl Viro file->private_data = info; 544ac27a0ecSDave Kleikamp } 545ac27a0ecSDave Kleikamp 546725bebb2SAl Viro if (ctx->pos == ext4_get_htree_eof(file)) 547ac27a0ecSDave Kleikamp return 0; /* EOF */ 548ac27a0ecSDave Kleikamp 549ac27a0ecSDave Kleikamp /* Some one has messed with f_pos; reset the world */ 550725bebb2SAl Viro if (info->last_pos != ctx->pos) { 551ac27a0ecSDave Kleikamp free_rb_tree_fname(&info->root); 552ac27a0ecSDave Kleikamp info->curr_node = NULL; 553ac27a0ecSDave Kleikamp info->extra_fname = NULL; 554725bebb2SAl Viro info->curr_hash = pos2maj_hash(file, ctx->pos); 555725bebb2SAl Viro info->curr_minor_hash = pos2min_hash(file, ctx->pos); 556ac27a0ecSDave Kleikamp } 557ac27a0ecSDave Kleikamp 558ac27a0ecSDave Kleikamp /* 559ac27a0ecSDave Kleikamp * If there are any leftover names on the hash collision 560ac27a0ecSDave Kleikamp * chain, return them first. 561ac27a0ecSDave Kleikamp */ 562d0156417STheodore Ts'o if (info->extra_fname) { 563725bebb2SAl Viro if (call_filldir(file, ctx, info->extra_fname)) 564ac27a0ecSDave Kleikamp goto finished; 565d0156417STheodore Ts'o info->extra_fname = NULL; 5663c37fc86STheodore Ts'o goto next_node; 567d0156417STheodore Ts'o } else if (!info->curr_node) 568ac27a0ecSDave Kleikamp info->curr_node = rb_first(&info->root); 569ac27a0ecSDave Kleikamp 570ac27a0ecSDave Kleikamp while (1) { 571ac27a0ecSDave Kleikamp /* 572ac27a0ecSDave Kleikamp * Fill the rbtree if we have no more entries, 573ac27a0ecSDave Kleikamp * or the inode has changed since we last read in the 574ac27a0ecSDave Kleikamp * cached entries. 575ac27a0ecSDave Kleikamp */ 576ac27a0ecSDave Kleikamp if ((!info->curr_node) || 577c472c07bSGoffredo Baroncelli !inode_eq_iversion(inode, file->f_version)) { 578ac27a0ecSDave Kleikamp info->curr_node = NULL; 579ac27a0ecSDave Kleikamp free_rb_tree_fname(&info->root); 580ee73f9a5SJeff Layton file->f_version = inode_query_iversion(inode); 581725bebb2SAl Viro ret = ext4_htree_fill_tree(file, info->curr_hash, 582ac27a0ecSDave Kleikamp info->curr_minor_hash, 583ac27a0ecSDave Kleikamp &info->next_hash); 584ac27a0ecSDave Kleikamp if (ret < 0) 585ac27a0ecSDave Kleikamp return ret; 586ac27a0ecSDave Kleikamp if (ret == 0) { 587725bebb2SAl Viro ctx->pos = ext4_get_htree_eof(file); 588ac27a0ecSDave Kleikamp break; 589ac27a0ecSDave Kleikamp } 590ac27a0ecSDave Kleikamp info->curr_node = rb_first(&info->root); 591ac27a0ecSDave Kleikamp } 592ac27a0ecSDave Kleikamp 593ac27a0ecSDave Kleikamp fname = rb_entry(info->curr_node, struct fname, rb_hash); 594ac27a0ecSDave Kleikamp info->curr_hash = fname->hash; 595ac27a0ecSDave Kleikamp info->curr_minor_hash = fname->minor_hash; 596725bebb2SAl Viro if (call_filldir(file, ctx, fname)) 597ac27a0ecSDave Kleikamp break; 5983c37fc86STheodore Ts'o next_node: 599ac27a0ecSDave Kleikamp info->curr_node = rb_next(info->curr_node); 6003c37fc86STheodore Ts'o if (info->curr_node) { 6013c37fc86STheodore Ts'o fname = rb_entry(info->curr_node, struct fname, 6023c37fc86STheodore Ts'o rb_hash); 6033c37fc86STheodore Ts'o info->curr_hash = fname->hash; 6043c37fc86STheodore Ts'o info->curr_minor_hash = fname->minor_hash; 6053c37fc86STheodore Ts'o } else { 606ac27a0ecSDave Kleikamp if (info->next_hash == ~0) { 607725bebb2SAl Viro ctx->pos = ext4_get_htree_eof(file); 608ac27a0ecSDave Kleikamp break; 609ac27a0ecSDave Kleikamp } 610ac27a0ecSDave Kleikamp info->curr_hash = info->next_hash; 611ac27a0ecSDave Kleikamp info->curr_minor_hash = 0; 612ac27a0ecSDave Kleikamp } 613ac27a0ecSDave Kleikamp } 614ac27a0ecSDave Kleikamp finished: 615725bebb2SAl Viro info->last_pos = ctx->pos; 616ac27a0ecSDave Kleikamp return 0; 617ac27a0ecSDave Kleikamp } 618ac27a0ecSDave Kleikamp 6196bc445e0STheodore Ts'o static int ext4_dir_open(struct inode * inode, struct file * filp) 6206bc445e0STheodore Ts'o { 621592ddec7SChandan Rajendra if (IS_ENCRYPTED(inode)) 622a7550b30SJaegeuk Kim return fscrypt_get_encryption_info(inode) ? -EACCES : 0; 6236bc445e0STheodore Ts'o return 0; 6246bc445e0STheodore Ts'o } 6256bc445e0STheodore Ts'o 626617ba13bSMingming Cao static int ext4_release_dir(struct inode *inode, struct file *filp) 627ac27a0ecSDave Kleikamp { 628ac27a0ecSDave Kleikamp if (filp->private_data) 629617ba13bSMingming Cao ext4_htree_free_dir_info(filp->private_data); 630ac27a0ecSDave Kleikamp 631ac27a0ecSDave Kleikamp return 0; 632ac27a0ecSDave Kleikamp } 633d1f5273eSFan Yong 63440b163f1SDarrick J. Wong int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, void *buf, 63540b163f1SDarrick J. Wong int buf_size) 63640b163f1SDarrick J. Wong { 63740b163f1SDarrick J. Wong struct ext4_dir_entry_2 *de; 63818017479SEric Engestrom int rlen; 63940b163f1SDarrick J. Wong unsigned int offset = 0; 64040b163f1SDarrick J. Wong char *top; 64140b163f1SDarrick J. Wong 64240b163f1SDarrick J. Wong de = (struct ext4_dir_entry_2 *)buf; 64340b163f1SDarrick J. Wong top = buf + buf_size; 64440b163f1SDarrick J. Wong while ((char *) de < top) { 64540b163f1SDarrick J. Wong if (ext4_check_dir_entry(dir, NULL, de, bh, 64640b163f1SDarrick J. Wong buf, buf_size, offset)) 6476a797d27SDarrick J. Wong return -EFSCORRUPTED; 64840b163f1SDarrick J. Wong rlen = ext4_rec_len_from_disk(de->rec_len, buf_size); 64940b163f1SDarrick J. Wong de = (struct ext4_dir_entry_2 *)((char *)de + rlen); 65040b163f1SDarrick J. Wong offset += rlen; 65140b163f1SDarrick J. Wong } 65240b163f1SDarrick J. Wong if ((char *) de > top) 6536a797d27SDarrick J. Wong return -EFSCORRUPTED; 65440b163f1SDarrick J. Wong 65540b163f1SDarrick J. Wong return 0; 65640b163f1SDarrick J. Wong } 65740b163f1SDarrick J. Wong 658d1f5273eSFan Yong const struct file_operations ext4_dir_operations = { 659d1f5273eSFan Yong .llseek = ext4_dir_llseek, 660d1f5273eSFan Yong .read = generic_read_dir, 661ae05327aSAl Viro .iterate_shared = ext4_readdir, 662d1f5273eSFan Yong .unlocked_ioctl = ext4_ioctl, 663d1f5273eSFan Yong #ifdef CONFIG_COMPAT 664d1f5273eSFan Yong .compat_ioctl = ext4_compat_ioctl, 665d1f5273eSFan Yong #endif 666d1f5273eSFan Yong .fsync = ext4_sync_file, 6676bc445e0STheodore Ts'o .open = ext4_dir_open, 668d1f5273eSFan Yong .release = ext4_release_dir, 669d1f5273eSFan Yong }; 670b886ee3eSGabriel Krisman Bertazi 671b886ee3eSGabriel Krisman Bertazi #ifdef CONFIG_UNICODE 672b886ee3eSGabriel Krisman Bertazi static int ext4_d_compare(const struct dentry *dentry, unsigned int len, 673b886ee3eSGabriel Krisman Bertazi const char *str, const struct qstr *name) 674b886ee3eSGabriel Krisman Bertazi { 675b886ee3eSGabriel Krisman Bertazi struct qstr qstr = {.name = str, .len = len }; 676ec772f01SEric Biggers const struct dentry *parent = READ_ONCE(dentry->d_parent); 677ec772f01SEric Biggers const struct inode *inode = READ_ONCE(parent->d_inode); 6782ce3ee93SEric Biggers char strbuf[DNAME_INLINE_LEN]; 679b886ee3eSGabriel Krisman Bertazi 680ec772f01SEric Biggers if (!inode || !IS_CASEFOLDED(inode) || 681ec772f01SEric Biggers !EXT4_SB(inode->i_sb)->s_encoding) { 682b886ee3eSGabriel Krisman Bertazi if (len != name->len) 683b886ee3eSGabriel Krisman Bertazi return -1; 68466883da1SGabriel Krisman Bertazi return memcmp(str, name->name, len); 685b886ee3eSGabriel Krisman Bertazi } 686b886ee3eSGabriel Krisman Bertazi 6872ce3ee93SEric Biggers /* 6882ce3ee93SEric Biggers * If the dentry name is stored in-line, then it may be concurrently 6892ce3ee93SEric Biggers * modified by a rename. If this happens, the VFS will eventually retry 6902ce3ee93SEric Biggers * the lookup, so it doesn't matter what ->d_compare() returns. 6912ce3ee93SEric Biggers * However, it's unsafe to call utf8_strncasecmp() with an unstable 6922ce3ee93SEric Biggers * string. Therefore, we have to copy the name into a temporary buffer. 6932ce3ee93SEric Biggers */ 6942ce3ee93SEric Biggers if (len <= DNAME_INLINE_LEN - 1) { 6952ce3ee93SEric Biggers memcpy(strbuf, str, len); 6962ce3ee93SEric Biggers strbuf[len] = 0; 6972ce3ee93SEric Biggers qstr.name = strbuf; 6982ce3ee93SEric Biggers /* prevent compiler from optimizing out the temporary buffer */ 6992ce3ee93SEric Biggers barrier(); 7002ce3ee93SEric Biggers } 7012ce3ee93SEric Biggers 7026456ca65STheodore Ts'o return ext4_ci_compare(inode, name, &qstr, false); 703b886ee3eSGabriel Krisman Bertazi } 704b886ee3eSGabriel Krisman Bertazi 705b886ee3eSGabriel Krisman Bertazi static int ext4_d_hash(const struct dentry *dentry, struct qstr *str) 706b886ee3eSGabriel Krisman Bertazi { 707b886ee3eSGabriel Krisman Bertazi const struct ext4_sb_info *sbi = EXT4_SB(dentry->d_sb); 708b886ee3eSGabriel Krisman Bertazi const struct unicode_map *um = sbi->s_encoding; 709ec772f01SEric Biggers const struct inode *inode = READ_ONCE(dentry->d_inode); 710b886ee3eSGabriel Krisman Bertazi unsigned char *norm; 711b886ee3eSGabriel Krisman Bertazi int len, ret = 0; 712b886ee3eSGabriel Krisman Bertazi 713ec772f01SEric Biggers if (!inode || !IS_CASEFOLDED(inode) || !um) 714b886ee3eSGabriel Krisman Bertazi return 0; 715b886ee3eSGabriel Krisman Bertazi 716b886ee3eSGabriel Krisman Bertazi norm = kmalloc(PATH_MAX, GFP_ATOMIC); 717b886ee3eSGabriel Krisman Bertazi if (!norm) 718b886ee3eSGabriel Krisman Bertazi return -ENOMEM; 719b886ee3eSGabriel Krisman Bertazi 720b886ee3eSGabriel Krisman Bertazi len = utf8_casefold(um, str, norm, PATH_MAX); 721b886ee3eSGabriel Krisman Bertazi if (len < 0) { 722b886ee3eSGabriel Krisman Bertazi if (ext4_has_strict_mode(sbi)) 723b886ee3eSGabriel Krisman Bertazi ret = -EINVAL; 724b886ee3eSGabriel Krisman Bertazi goto out; 725b886ee3eSGabriel Krisman Bertazi } 726b886ee3eSGabriel Krisman Bertazi str->hash = full_name_hash(dentry, norm, len); 727b886ee3eSGabriel Krisman Bertazi out: 728b886ee3eSGabriel Krisman Bertazi kfree(norm); 729b886ee3eSGabriel Krisman Bertazi return ret; 730b886ee3eSGabriel Krisman Bertazi } 731b886ee3eSGabriel Krisman Bertazi 732b886ee3eSGabriel Krisman Bertazi const struct dentry_operations ext4_dentry_ops = { 733b886ee3eSGabriel Krisman Bertazi .d_hash = ext4_d_hash, 734b886ee3eSGabriel Krisman Bertazi .d_compare = ext4_d_compare, 735b886ee3eSGabriel Krisman Bertazi }; 736b886ee3eSGabriel Krisman Bertazi #endif 737