Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2 | * linux/fs/ext4/dir.c |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 1992, 1993, 1994, 1995 |
| 5 | * Remy Card (card@masi.ibp.fr) |
| 6 | * Laboratoire MASI - Institut Blaise Pascal |
| 7 | * Universite Pierre et Marie Curie (Paris VI) |
| 8 | * |
| 9 | * from |
| 10 | * |
| 11 | * linux/fs/minix/dir.c |
| 12 | * |
| 13 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 14 | * |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 15 | * ext4 directory handling functions |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 16 | * |
| 17 | * Big-endian to little-endian byte-swapping/bitmaps by |
| 18 | * David S. Miller (davem@caip.rutgers.edu), 1995 |
| 19 | * |
| 20 | * Hash Tree Directory indexing (c) 2001 Daniel Phillips |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include <linux/fs.h> |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 25 | #include <linux/buffer_head.h> |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 26 | #include <linux/slab.h> |
Christoph Hellwig | 3dcf545 | 2008-04-29 18:13:32 -0400 | [diff] [blame] | 27 | #include "ext4.h" |
Tao Ma | 65d165d | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 28 | #include "xattr.h" |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 29 | |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 30 | static int ext4_dx_readdir(struct file *, struct dir_context *); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 31 | |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 32 | /** |
| 33 | * Check if the given dir-inode refers to an htree-indexed directory |
Anatol Pomozov | 70261f5 | 2013-08-28 14:40:12 -0400 | [diff] [blame] | 34 | * (or a directory which could potentially get converted to use htree |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 35 | * indexing). |
| 36 | * |
| 37 | * Return 1 if it is a dx dir, 0 if not |
| 38 | */ |
| 39 | static int is_dx_dir(struct inode *inode) |
| 40 | { |
| 41 | struct super_block *sb = inode->i_sb; |
| 42 | |
Darrick J. Wong | e2b911c | 2015-10-17 16:18:43 -0400 | [diff] [blame] | 43 | if (ext4_has_feature_dir_index(inode->i_sb) && |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 44 | ((ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) || |
Tao Ma | 8af0f08 | 2013-04-19 17:53:09 -0400 | [diff] [blame] | 45 | ((inode->i_size >> sb->s_blocksize_bits) == 1) || |
| 46 | ext4_has_inline_data(inode))) |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 47 | return 1; |
| 48 | |
| 49 | return 0; |
| 50 | } |
| 51 | |
Theodore Ts'o | cad3f00 | 2010-12-19 22:07:02 -0500 | [diff] [blame] | 52 | /* |
| 53 | * Return 0 if the directory entry is OK, and 1 if there is a problem |
| 54 | * |
| 55 | * Note: this is the opposite of what ext2 and ext3 historically returned... |
Tao Ma | 65d165d | 2012-12-10 14:05:59 -0500 | [diff] [blame] | 56 | * |
| 57 | * bh passed here can be an inode block or a dir data block, depending |
| 58 | * on the inode inline data flag. |
Theodore Ts'o | cad3f00 | 2010-12-19 22:07:02 -0500 | [diff] [blame] | 59 | */ |
Theodore Ts'o | 60fd4da | 2010-07-27 11:54:40 -0400 | [diff] [blame] | 60 | int __ext4_check_dir_entry(const char *function, unsigned int line, |
Theodore Ts'o | f7c2117 | 2011-01-10 12:10:55 -0500 | [diff] [blame] | 61 | struct inode *dir, struct file *filp, |
Theodore Ts'o | 60fd4da | 2010-07-27 11:54:40 -0400 | [diff] [blame] | 62 | struct ext4_dir_entry_2 *de, |
Tao Ma | 226ba97 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 63 | struct buffer_head *bh, char *buf, int size, |
Theodore Ts'o | 60fd4da | 2010-07-27 11:54:40 -0400 | [diff] [blame] | 64 | unsigned int offset) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 65 | { |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 66 | const char *error_msg = NULL; |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 67 | const int rlen = ext4_rec_len_from_disk(de->rec_len, |
| 68 | dir->i_sb->s_blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 69 | |
Theodore Ts'o | cad3f00 | 2010-12-19 22:07:02 -0500 | [diff] [blame] | 70 | if (unlikely(rlen < EXT4_DIR_REC_LEN(1))) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 71 | error_msg = "rec_len is smaller than minimal"; |
Theodore Ts'o | cad3f00 | 2010-12-19 22:07:02 -0500 | [diff] [blame] | 72 | else if (unlikely(rlen % 4 != 0)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 73 | error_msg = "rec_len % 4 != 0"; |
Theodore Ts'o | cad3f00 | 2010-12-19 22:07:02 -0500 | [diff] [blame] | 74 | else if (unlikely(rlen < EXT4_DIR_REC_LEN(de->name_len))) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 75 | error_msg = "rec_len is too small for name_len"; |
Tao Ma | 226ba97 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 76 | else if (unlikely(((char *) de - buf) + rlen > size)) |
| 77 | error_msg = "directory entry across range"; |
Theodore Ts'o | cad3f00 | 2010-12-19 22:07:02 -0500 | [diff] [blame] | 78 | else if (unlikely(le32_to_cpu(de->inode) > |
| 79 | le32_to_cpu(EXT4_SB(dir->i_sb)->s_es->s_inodes_count))) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 80 | error_msg = "inode out of bounds"; |
Theodore Ts'o | cad3f00 | 2010-12-19 22:07:02 -0500 | [diff] [blame] | 81 | else |
| 82 | return 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 83 | |
Theodore Ts'o | f7c2117 | 2011-01-10 12:10:55 -0500 | [diff] [blame] | 84 | if (filp) |
Dan Carpenter | 4fda400 | 2012-02-20 17:53:05 -0500 | [diff] [blame] | 85 | ext4_error_file(filp, function, line, bh->b_blocknr, |
Theodore Ts'o | f7c2117 | 2011-01-10 12:10:55 -0500 | [diff] [blame] | 86 | "bad entry in directory: %s - offset=%u(%u), " |
| 87 | "inode=%u, rec_len=%d, name_len=%d", |
Tao Ma | 226ba97 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 88 | error_msg, (unsigned) (offset % size), |
Theodore Ts'o | f7c2117 | 2011-01-10 12:10:55 -0500 | [diff] [blame] | 89 | offset, le32_to_cpu(de->inode), |
| 90 | rlen, de->name_len); |
| 91 | else |
Dan Carpenter | 4fda400 | 2012-02-20 17:53:05 -0500 | [diff] [blame] | 92 | ext4_error_inode(dir, function, line, bh->b_blocknr, |
Theodore Ts'o | f7c2117 | 2011-01-10 12:10:55 -0500 | [diff] [blame] | 93 | "bad entry in directory: %s - offset=%u(%u), " |
| 94 | "inode=%u, rec_len=%d, name_len=%d", |
Tao Ma | 226ba97 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 95 | error_msg, (unsigned) (offset % size), |
Theodore Ts'o | f7c2117 | 2011-01-10 12:10:55 -0500 | [diff] [blame] | 96 | offset, le32_to_cpu(de->inode), |
| 97 | rlen, de->name_len); |
| 98 | |
Theodore Ts'o | cad3f00 | 2010-12-19 22:07:02 -0500 | [diff] [blame] | 99 | return 1; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 100 | } |
| 101 | |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 102 | static int ext4_readdir(struct file *file, struct dir_context *ctx) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 103 | { |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 104 | unsigned int offset; |
Giedrius Rekasius | aa13d5f | 2014-05-27 12:48:55 -0400 | [diff] [blame] | 105 | int i; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 106 | struct ext4_dir_entry_2 *de; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 107 | int err; |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 108 | struct inode *inode = file_inode(file); |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 109 | struct super_block *sb = inode->i_sb; |
Michael Halcrow | 4461471 | 2015-04-12 01:09:05 -0400 | [diff] [blame] | 110 | struct buffer_head *bh = NULL; |
Eric Sandeen | 9d9f177 | 2008-10-09 11:15:52 -0400 | [diff] [blame] | 111 | int dir_has_error = 0; |
Jaegeuk Kim | a7550b3 | 2016-07-10 14:01:03 -0400 | [diff] [blame] | 112 | struct fscrypt_str fstr = FSTR_INIT(NULL, 0); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 113 | |
Theodore Ts'o | 28b4c26 | 2016-02-07 19:35:05 -0500 | [diff] [blame] | 114 | if (ext4_encrypted_inode(inode)) { |
Jaegeuk Kim | a7550b3 | 2016-07-10 14:01:03 -0400 | [diff] [blame] | 115 | err = fscrypt_get_encryption_info(inode); |
Theodore Ts'o | 28b4c26 | 2016-02-07 19:35:05 -0500 | [diff] [blame] | 116 | if (err && err != -ENOKEY) |
| 117 | return err; |
| 118 | } |
| 119 | |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 120 | if (is_dx_dir(inode)) { |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 121 | err = ext4_dx_readdir(file, ctx); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 122 | if (err != ERR_BAD_DX_DIR) { |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 123 | return err; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 124 | } |
| 125 | /* |
| 126 | * We don't set the inode dirty flag since it's not |
| 127 | * critical that it get flushed back to the disk. |
| 128 | */ |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 129 | ext4_clear_inode_flag(file_inode(file), |
Theodore Ts'o | 07a0382 | 2010-06-14 09:54:48 -0400 | [diff] [blame] | 130 | EXT4_INODE_INDEX); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 131 | } |
Tao Ma | 8af0f08 | 2013-04-19 17:53:09 -0400 | [diff] [blame] | 132 | |
| 133 | if (ext4_has_inline_data(inode)) { |
| 134 | int has_inline_data = 1; |
Michael Halcrow | 4461471 | 2015-04-12 01:09:05 -0400 | [diff] [blame] | 135 | err = ext4_read_inline_dir(file, ctx, |
Tao Ma | 8af0f08 | 2013-04-19 17:53:09 -0400 | [diff] [blame] | 136 | &has_inline_data); |
| 137 | if (has_inline_data) |
Michael Halcrow | 4461471 | 2015-04-12 01:09:05 -0400 | [diff] [blame] | 138 | return err; |
| 139 | } |
| 140 | |
Theodore Ts'o | b7236e2 | 2015-05-18 13:17:47 -0400 | [diff] [blame] | 141 | if (ext4_encrypted_inode(inode)) { |
Jaegeuk Kim | a7550b3 | 2016-07-10 14:01:03 -0400 | [diff] [blame] | 142 | err = fscrypt_fname_alloc_buffer(inode, EXT4_NAME_LEN, &fstr); |
Theodore Ts'o | b7236e2 | 2015-05-18 13:17:47 -0400 | [diff] [blame] | 143 | if (err < 0) |
Michael Halcrow | 4461471 | 2015-04-12 01:09:05 -0400 | [diff] [blame] | 144 | return err; |
Tao Ma | 8af0f08 | 2013-04-19 17:53:09 -0400 | [diff] [blame] | 145 | } |
| 146 | |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 147 | offset = ctx->pos & (sb->s_blocksize - 1); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 148 | |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 149 | while (ctx->pos < inode->i_size) { |
Theodore Ts'o | 2ed8868 | 2010-05-16 20:00:00 -0400 | [diff] [blame] | 150 | struct ext4_map_blocks map; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 151 | |
Theodore Ts'o | 1f60fbe | 2016-04-23 22:50:07 -0400 | [diff] [blame] | 152 | if (fatal_signal_pending(current)) { |
| 153 | err = -ERESTARTSYS; |
| 154 | goto errout; |
| 155 | } |
| 156 | cond_resched(); |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 157 | map.m_lblk = ctx->pos >> EXT4_BLOCK_SIZE_BITS(sb); |
Theodore Ts'o | 2ed8868 | 2010-05-16 20:00:00 -0400 | [diff] [blame] | 158 | map.m_len = 1; |
| 159 | err = ext4_map_blocks(NULL, inode, &map, 0); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 160 | if (err > 0) { |
Theodore Ts'o | 2ed8868 | 2010-05-16 20:00:00 -0400 | [diff] [blame] | 161 | pgoff_t index = map.m_pblk >> |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 162 | (PAGE_SHIFT - inode->i_blkbits); |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 163 | if (!ra_has_index(&file->f_ra, index)) |
Rusty Russell | cf914a7 | 2007-07-19 01:48:08 -0700 | [diff] [blame] | 164 | page_cache_sync_readahead( |
Fengguang Wu | dc7868f | 2007-07-19 01:48:04 -0700 | [diff] [blame] | 165 | sb->s_bdev->bd_inode->i_mapping, |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 166 | &file->f_ra, file, |
Rusty Russell | cf914a7 | 2007-07-19 01:48:08 -0700 | [diff] [blame] | 167 | index, 1); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 168 | file->f_ra.prev_pos = (loff_t)index << PAGE_SHIFT; |
Theodore Ts'o | 1c21502 | 2014-08-29 20:52:15 -0400 | [diff] [blame] | 169 | bh = ext4_bread(NULL, inode, map.m_lblk, 0); |
Kirill Tkhai | c906f38 | 2016-02-16 00:20:19 -0500 | [diff] [blame] | 170 | if (IS_ERR(bh)) { |
| 171 | err = PTR_ERR(bh); |
| 172 | bh = NULL; |
| 173 | goto errout; |
| 174 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 175 | } |
| 176 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 177 | if (!bh) { |
Eric Sandeen | 9d9f177 | 2008-10-09 11:15:52 -0400 | [diff] [blame] | 178 | if (!dir_has_error) { |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 179 | EXT4_ERROR_FILE(file, 0, |
Theodore Ts'o | f7c2117 | 2011-01-10 12:10:55 -0500 | [diff] [blame] | 180 | "directory contains a " |
| 181 | "hole at offset %llu", |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 182 | (unsigned long long) ctx->pos); |
Eric Sandeen | 9d9f177 | 2008-10-09 11:15:52 -0400 | [diff] [blame] | 183 | dir_has_error = 1; |
| 184 | } |
Eric Sandeen | e6c4021 | 2006-12-06 20:36:28 -0800 | [diff] [blame] | 185 | /* corrupt size? Maybe no more blocks to read */ |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 186 | if (ctx->pos > inode->i_blocks << 9) |
Eric Sandeen | e6c4021 | 2006-12-06 20:36:28 -0800 | [diff] [blame] | 187 | break; |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 188 | ctx->pos += sb->s_blocksize - offset; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 189 | continue; |
| 190 | } |
| 191 | |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 192 | /* Check the checksum */ |
| 193 | if (!buffer_verified(bh) && |
| 194 | !ext4_dirent_csum_verify(inode, |
| 195 | (struct ext4_dir_entry *)bh->b_data)) { |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 196 | EXT4_ERROR_FILE(file, 0, "directory fails checksum " |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 197 | "at offset %llu", |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 198 | (unsigned long long)ctx->pos); |
| 199 | ctx->pos += sb->s_blocksize - offset; |
Guo Chao | d5ac777 | 2013-01-28 21:23:24 -0500 | [diff] [blame] | 200 | brelse(bh); |
Michael Halcrow | 4461471 | 2015-04-12 01:09:05 -0400 | [diff] [blame] | 201 | bh = NULL; |
Darrick J. Wong | b0336e8 | 2012-04-29 18:41:10 -0400 | [diff] [blame] | 202 | continue; |
| 203 | } |
| 204 | set_buffer_verified(bh); |
| 205 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 206 | /* If the dir block has changed since the last call to |
| 207 | * readdir(2), then we might be pointing to an invalid |
| 208 | * dirent right now. Scan from the start of the block |
| 209 | * to make sure. */ |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 210 | if (file->f_version != inode->i_version) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 211 | for (i = 0; i < sb->s_blocksize && i < offset; ) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 212 | de = (struct ext4_dir_entry_2 *) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 213 | (bh->b_data + i); |
| 214 | /* It's too expensive to do a full |
| 215 | * dirent test each time round this |
| 216 | * loop, but we do have to test at |
| 217 | * least that it is non-zero. A |
| 218 | * failure will be detected in the |
| 219 | * dirent test below. */ |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 220 | if (ext4_rec_len_from_disk(de->rec_len, |
| 221 | sb->s_blocksize) < EXT4_DIR_REC_LEN(1)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 222 | break; |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 223 | i += ext4_rec_len_from_disk(de->rec_len, |
| 224 | sb->s_blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 225 | } |
| 226 | offset = i; |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 227 | ctx->pos = (ctx->pos & ~(sb->s_blocksize - 1)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 228 | | offset; |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 229 | file->f_version = inode->i_version; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 230 | } |
| 231 | |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 232 | while (ctx->pos < inode->i_size |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 233 | && offset < sb->s_blocksize) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 234 | de = (struct ext4_dir_entry_2 *) (bh->b_data + offset); |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 235 | if (ext4_check_dir_entry(inode, file, de, bh, |
Tao Ma | 226ba97 | 2012-12-10 14:05:58 -0500 | [diff] [blame] | 236 | bh->b_data, bh->b_size, |
| 237 | offset)) { |
Andrew Morton | 63f5793 | 2006-10-11 01:21:24 -0700 | [diff] [blame] | 238 | /* |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 239 | * On error, skip to the next block |
Andrew Morton | 63f5793 | 2006-10-11 01:21:24 -0700 | [diff] [blame] | 240 | */ |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 241 | ctx->pos = (ctx->pos | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 242 | (sb->s_blocksize - 1)) + 1; |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 243 | break; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 244 | } |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 245 | offset += ext4_rec_len_from_disk(de->rec_len, |
| 246 | sb->s_blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 247 | if (le32_to_cpu(de->inode)) { |
Theodore Ts'o | b7236e2 | 2015-05-18 13:17:47 -0400 | [diff] [blame] | 248 | if (!ext4_encrypted_inode(inode)) { |
Michael Halcrow | 4461471 | 2015-04-12 01:09:05 -0400 | [diff] [blame] | 249 | if (!dir_emit(ctx, de->name, |
| 250 | de->name_len, |
| 251 | le32_to_cpu(de->inode), |
| 252 | get_dtype(sb, de->file_type))) |
| 253 | goto done; |
| 254 | } else { |
Jaegeuk Kim | a7550b3 | 2016-07-10 14:01:03 -0400 | [diff] [blame] | 255 | int save_len = fstr.len; |
| 256 | struct fscrypt_str de_name = |
| 257 | FSTR_INIT(de->name, |
| 258 | de->name_len); |
Theodore Ts'o | d229959 | 2015-05-18 13:15:47 -0400 | [diff] [blame] | 259 | |
Michael Halcrow | 4461471 | 2015-04-12 01:09:05 -0400 | [diff] [blame] | 260 | /* Directory is encrypted */ |
Jaegeuk Kim | a7550b3 | 2016-07-10 14:01:03 -0400 | [diff] [blame] | 261 | err = fscrypt_fname_disk_to_usr(inode, |
| 262 | 0, 0, &de_name, &fstr); |
| 263 | fstr.len = save_len; |
Michael Halcrow | 4461471 | 2015-04-12 01:09:05 -0400 | [diff] [blame] | 264 | if (err < 0) |
| 265 | goto errout; |
| 266 | if (!dir_emit(ctx, |
Jaegeuk Kim | a7550b3 | 2016-07-10 14:01:03 -0400 | [diff] [blame] | 267 | fstr.name, err, |
Michael Halcrow | 4461471 | 2015-04-12 01:09:05 -0400 | [diff] [blame] | 268 | le32_to_cpu(de->inode), |
| 269 | get_dtype(sb, de->file_type))) |
| 270 | goto done; |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 271 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 272 | } |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 273 | ctx->pos += ext4_rec_len_from_disk(de->rec_len, |
Wei Yongjun | 3d0518f | 2009-02-14 23:01:36 -0500 | [diff] [blame] | 274 | sb->s_blocksize); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 275 | } |
Al Viro | ae05327 | 2016-05-12 20:36:01 -0400 | [diff] [blame] | 276 | if ((ctx->pos < inode->i_size) && !dir_relax_shared(inode)) |
Michael Halcrow | 4461471 | 2015-04-12 01:09:05 -0400 | [diff] [blame] | 277 | goto done; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 278 | brelse(bh); |
Michael Halcrow | 4461471 | 2015-04-12 01:09:05 -0400 | [diff] [blame] | 279 | bh = NULL; |
| 280 | offset = 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 281 | } |
Michael Halcrow | 4461471 | 2015-04-12 01:09:05 -0400 | [diff] [blame] | 282 | done: |
| 283 | err = 0; |
| 284 | errout: |
| 285 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
Jaegeuk Kim | a7550b3 | 2016-07-10 14:01:03 -0400 | [diff] [blame] | 286 | fscrypt_fname_free_buffer(&fstr); |
Michael Halcrow | 4461471 | 2015-04-12 01:09:05 -0400 | [diff] [blame] | 287 | #endif |
| 288 | brelse(bh); |
| 289 | return err; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 290 | } |
| 291 | |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 292 | static inline int is_32bit_api(void) |
| 293 | { |
| 294 | #ifdef CONFIG_COMPAT |
Andy Lutomirski | 121cef8 | 2016-03-22 14:25:04 -0700 | [diff] [blame] | 295 | return in_compat_syscall(); |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 296 | #else |
| 297 | return (BITS_PER_LONG == 32); |
| 298 | #endif |
| 299 | } |
| 300 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 301 | /* |
| 302 | * These functions convert from the major/minor hash to an f_pos |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 303 | * value for dx directories |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 304 | * |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 305 | * Upper layer (for example NFS) should specify FMODE_32BITHASH or |
| 306 | * FMODE_64BITHASH explicitly. On the other hand, we allow ext4 to be mounted |
| 307 | * directly on both 32-bit and 64-bit nodes, under such case, neither |
| 308 | * FMODE_32BITHASH nor FMODE_64BITHASH is specified. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 309 | */ |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 310 | static inline loff_t hash2pos(struct file *filp, __u32 major, __u32 minor) |
| 311 | { |
| 312 | if ((filp->f_mode & FMODE_32BITHASH) || |
| 313 | (!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api())) |
| 314 | return major >> 1; |
| 315 | else |
| 316 | return ((__u64)(major >> 1) << 32) | (__u64)minor; |
| 317 | } |
| 318 | |
| 319 | static inline __u32 pos2maj_hash(struct file *filp, loff_t pos) |
| 320 | { |
| 321 | if ((filp->f_mode & FMODE_32BITHASH) || |
| 322 | (!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api())) |
| 323 | return (pos << 1) & 0xffffffff; |
| 324 | else |
| 325 | return ((pos >> 32) << 1) & 0xffffffff; |
| 326 | } |
| 327 | |
| 328 | static inline __u32 pos2min_hash(struct file *filp, loff_t pos) |
| 329 | { |
| 330 | if ((filp->f_mode & FMODE_32BITHASH) || |
| 331 | (!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api())) |
| 332 | return 0; |
| 333 | else |
| 334 | return pos & 0xffffffff; |
| 335 | } |
| 336 | |
| 337 | /* |
| 338 | * Return 32- or 64-bit end-of-file for dx directories |
| 339 | */ |
| 340 | static inline loff_t ext4_get_htree_eof(struct file *filp) |
| 341 | { |
| 342 | if ((filp->f_mode & FMODE_32BITHASH) || |
| 343 | (!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api())) |
| 344 | return EXT4_HTREE_EOF_32BIT; |
| 345 | else |
| 346 | return EXT4_HTREE_EOF_64BIT; |
| 347 | } |
| 348 | |
| 349 | |
| 350 | /* |
Eric Sandeen | ec7268c | 2012-04-30 13:14:03 -0500 | [diff] [blame] | 351 | * ext4_dir_llseek() calls generic_file_llseek_size to handle htree |
| 352 | * directories, where the "offset" is in terms of the filename hash |
| 353 | * value instead of the byte offset. |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 354 | * |
Eric Sandeen | ec7268c | 2012-04-30 13:14:03 -0500 | [diff] [blame] | 355 | * Because we may return a 64-bit hash that is well beyond offset limits, |
| 356 | * we need to pass the max hash as the maximum allowable offset in |
| 357 | * the htree directory case. |
| 358 | * |
| 359 | * For non-htree, ext4_llseek already chooses the proper max offset. |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 360 | */ |
Zheng Liu | d4e4395 | 2013-03-02 17:24:05 -0500 | [diff] [blame] | 361 | static loff_t ext4_dir_llseek(struct file *file, loff_t offset, int whence) |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 362 | { |
| 363 | struct inode *inode = file->f_mapping->host; |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 364 | int dx_dir = is_dx_dir(inode); |
Eric Sandeen | ec7268c | 2012-04-30 13:14:03 -0500 | [diff] [blame] | 365 | loff_t htree_max = ext4_get_htree_eof(file); |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 366 | |
Eric Sandeen | ec7268c | 2012-04-30 13:14:03 -0500 | [diff] [blame] | 367 | if (likely(dx_dir)) |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 368 | return generic_file_llseek_size(file, offset, whence, |
Eric Sandeen | ec7268c | 2012-04-30 13:14:03 -0500 | [diff] [blame] | 369 | htree_max, htree_max); |
| 370 | else |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 371 | return ext4_llseek(file, offset, whence); |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 372 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 373 | |
| 374 | /* |
| 375 | * This structure holds the nodes of the red-black tree used to store |
| 376 | * the directory entry in hash order. |
| 377 | */ |
| 378 | struct fname { |
| 379 | __u32 hash; |
| 380 | __u32 minor_hash; |
| 381 | struct rb_node rb_hash; |
| 382 | struct fname *next; |
| 383 | __u32 inode; |
| 384 | __u8 name_len; |
| 385 | __u8 file_type; |
| 386 | char name[0]; |
| 387 | }; |
| 388 | |
| 389 | /* |
| 390 | * This functoin implements a non-recursive way of freeing all of the |
| 391 | * nodes in the red-black tree. |
| 392 | */ |
| 393 | static void free_rb_tree_fname(struct rb_root *root) |
| 394 | { |
Cody P Schafer | d1866bd | 2014-01-23 15:56:10 -0800 | [diff] [blame] | 395 | struct fname *fname, *next; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 396 | |
Cody P Schafer | d1866bd | 2014-01-23 15:56:10 -0800 | [diff] [blame] | 397 | rbtree_postorder_for_each_entry_safe(fname, next, root, rb_hash) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 398 | while (fname) { |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 399 | struct fname *old = fname; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 400 | fname = fname->next; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 401 | kfree(old); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 402 | } |
Cody P Schafer | d1866bd | 2014-01-23 15:56:10 -0800 | [diff] [blame] | 403 | |
| 404 | *root = RB_ROOT; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 405 | } |
| 406 | |
| 407 | |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 408 | static struct dir_private_info *ext4_htree_create_dir_info(struct file *filp, |
| 409 | loff_t pos) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 410 | { |
| 411 | struct dir_private_info *p; |
| 412 | |
Shen Feng | 69baee0 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 413 | p = kzalloc(sizeof(struct dir_private_info), GFP_KERNEL); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 414 | if (!p) |
| 415 | return NULL; |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 416 | p->curr_hash = pos2maj_hash(filp, pos); |
| 417 | p->curr_minor_hash = pos2min_hash(filp, pos); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 418 | return p; |
| 419 | } |
| 420 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 421 | void ext4_htree_free_dir_info(struct dir_private_info *p) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 422 | { |
| 423 | free_rb_tree_fname(&p->root); |
| 424 | kfree(p); |
| 425 | } |
| 426 | |
| 427 | /* |
| 428 | * Given a directory entry, enter it into the fname rb tree. |
Theodore Ts'o | 2f61830 | 2015-04-12 00:56:26 -0400 | [diff] [blame] | 429 | * |
| 430 | * When filename encryption is enabled, the dirent will hold the |
| 431 | * encrypted filename, while the htree will hold decrypted filename. |
| 432 | * The decrypted filename is passed in via ent_name. parameter. |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 433 | */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 434 | int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 435 | __u32 minor_hash, |
Theodore Ts'o | 2f61830 | 2015-04-12 00:56:26 -0400 | [diff] [blame] | 436 | struct ext4_dir_entry_2 *dirent, |
Jaegeuk Kim | a7550b3 | 2016-07-10 14:01:03 -0400 | [diff] [blame] | 437 | struct fscrypt_str *ent_name) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 438 | { |
| 439 | struct rb_node **p, *parent = NULL; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 440 | struct fname *fname, *new_fn; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 441 | struct dir_private_info *info; |
| 442 | int len; |
| 443 | |
Joe Perches | a271fe8 | 2010-07-27 11:56:04 -0400 | [diff] [blame] | 444 | info = dir_file->private_data; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 445 | p = &info->root.rb_node; |
| 446 | |
| 447 | /* Create and allocate the fname structure */ |
Theodore Ts'o | 2f61830 | 2015-04-12 00:56:26 -0400 | [diff] [blame] | 448 | len = sizeof(struct fname) + ent_name->len + 1; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 449 | new_fn = kzalloc(len, GFP_KERNEL); |
| 450 | if (!new_fn) |
| 451 | return -ENOMEM; |
| 452 | new_fn->hash = hash; |
| 453 | new_fn->minor_hash = minor_hash; |
| 454 | new_fn->inode = le32_to_cpu(dirent->inode); |
Theodore Ts'o | 2f61830 | 2015-04-12 00:56:26 -0400 | [diff] [blame] | 455 | new_fn->name_len = ent_name->len; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 456 | new_fn->file_type = dirent->file_type; |
Theodore Ts'o | 2f61830 | 2015-04-12 00:56:26 -0400 | [diff] [blame] | 457 | memcpy(new_fn->name, ent_name->name, ent_name->len); |
| 458 | new_fn->name[ent_name->len] = 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 459 | |
| 460 | while (*p) { |
| 461 | parent = *p; |
| 462 | fname = rb_entry(parent, struct fname, rb_hash); |
| 463 | |
| 464 | /* |
| 465 | * If the hash and minor hash match up, then we put |
| 466 | * them on a linked list. This rarely happens... |
| 467 | */ |
| 468 | if ((new_fn->hash == fname->hash) && |
| 469 | (new_fn->minor_hash == fname->minor_hash)) { |
| 470 | new_fn->next = fname->next; |
| 471 | fname->next = new_fn; |
| 472 | return 0; |
| 473 | } |
| 474 | |
| 475 | if (new_fn->hash < fname->hash) |
| 476 | p = &(*p)->rb_left; |
| 477 | else if (new_fn->hash > fname->hash) |
| 478 | p = &(*p)->rb_right; |
| 479 | else if (new_fn->minor_hash < fname->minor_hash) |
| 480 | p = &(*p)->rb_left; |
| 481 | else /* if (new_fn->minor_hash > fname->minor_hash) */ |
| 482 | p = &(*p)->rb_right; |
| 483 | } |
| 484 | |
| 485 | rb_link_node(&new_fn->rb_hash, parent, p); |
| 486 | rb_insert_color(&new_fn->rb_hash, &info->root); |
| 487 | return 0; |
| 488 | } |
| 489 | |
| 490 | |
| 491 | |
| 492 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 493 | * This is a helper function for ext4_dx_readdir. It calls filldir |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 494 | * for all entres on the fname linked list. (Normally there is only |
| 495 | * one entry on the linked list, unless there are 62 bit hash collisions.) |
| 496 | */ |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 497 | static int call_filldir(struct file *file, struct dir_context *ctx, |
| 498 | struct fname *fname) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 499 | { |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 500 | struct dir_private_info *info = file->private_data; |
| 501 | struct inode *inode = file_inode(file); |
| 502 | struct super_block *sb = inode->i_sb; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 503 | |
| 504 | if (!fname) { |
Theodore Ts'o | 92b9781 | 2012-03-19 23:41:49 -0400 | [diff] [blame] | 505 | ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: comm %s: " |
| 506 | "called with null fname?!?", __func__, __LINE__, |
| 507 | inode->i_ino, current->comm); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 508 | return 0; |
| 509 | } |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 510 | ctx->pos = hash2pos(file, fname->hash, fname->minor_hash); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 511 | while (fname) { |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 512 | if (!dir_emit(ctx, fname->name, |
| 513 | fname->name_len, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 514 | fname->inode, |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 515 | get_dtype(sb, fname->file_type))) { |
Theodore Ts'o | d015641 | 2008-08-19 21:57:43 -0400 | [diff] [blame] | 516 | info->extra_fname = fname; |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 517 | return 1; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 518 | } |
| 519 | fname = fname->next; |
| 520 | } |
| 521 | return 0; |
| 522 | } |
| 523 | |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 524 | static int ext4_dx_readdir(struct file *file, struct dir_context *ctx) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 525 | { |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 526 | struct dir_private_info *info = file->private_data; |
| 527 | struct inode *inode = file_inode(file); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 528 | struct fname *fname; |
| 529 | int ret; |
| 530 | |
| 531 | if (!info) { |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 532 | info = ext4_htree_create_dir_info(file, ctx->pos); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 533 | if (!info) |
| 534 | return -ENOMEM; |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 535 | file->private_data = info; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 536 | } |
| 537 | |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 538 | if (ctx->pos == ext4_get_htree_eof(file)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 539 | return 0; /* EOF */ |
| 540 | |
| 541 | /* Some one has messed with f_pos; reset the world */ |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 542 | if (info->last_pos != ctx->pos) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 543 | free_rb_tree_fname(&info->root); |
| 544 | info->curr_node = NULL; |
| 545 | info->extra_fname = NULL; |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 546 | info->curr_hash = pos2maj_hash(file, ctx->pos); |
| 547 | info->curr_minor_hash = pos2min_hash(file, ctx->pos); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 548 | } |
| 549 | |
| 550 | /* |
| 551 | * If there are any leftover names on the hash collision |
| 552 | * chain, return them first. |
| 553 | */ |
Theodore Ts'o | d015641 | 2008-08-19 21:57:43 -0400 | [diff] [blame] | 554 | if (info->extra_fname) { |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 555 | if (call_filldir(file, ctx, info->extra_fname)) |
Theodore Ts'o | d015641 | 2008-08-19 21:57:43 -0400 | [diff] [blame] | 556 | goto finished; |
Theodore Ts'o | d015641 | 2008-08-19 21:57:43 -0400 | [diff] [blame] | 557 | info->extra_fname = NULL; |
Theodore Ts'o | 3c37fc8 | 2008-10-25 11:39:08 -0400 | [diff] [blame] | 558 | goto next_node; |
Theodore Ts'o | d015641 | 2008-08-19 21:57:43 -0400 | [diff] [blame] | 559 | } else if (!info->curr_node) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 560 | info->curr_node = rb_first(&info->root); |
| 561 | |
| 562 | while (1) { |
| 563 | /* |
| 564 | * Fill the rbtree if we have no more entries, |
| 565 | * or the inode has changed since we last read in the |
| 566 | * cached entries. |
| 567 | */ |
| 568 | if ((!info->curr_node) || |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 569 | (file->f_version != inode->i_version)) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 570 | info->curr_node = NULL; |
| 571 | free_rb_tree_fname(&info->root); |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 572 | file->f_version = inode->i_version; |
| 573 | ret = ext4_htree_fill_tree(file, info->curr_hash, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 574 | info->curr_minor_hash, |
| 575 | &info->next_hash); |
| 576 | if (ret < 0) |
| 577 | return ret; |
| 578 | if (ret == 0) { |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 579 | ctx->pos = ext4_get_htree_eof(file); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 580 | break; |
| 581 | } |
| 582 | info->curr_node = rb_first(&info->root); |
| 583 | } |
| 584 | |
| 585 | fname = rb_entry(info->curr_node, struct fname, rb_hash); |
| 586 | info->curr_hash = fname->hash; |
| 587 | info->curr_minor_hash = fname->minor_hash; |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 588 | if (call_filldir(file, ctx, fname)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 589 | break; |
Theodore Ts'o | 3c37fc8 | 2008-10-25 11:39:08 -0400 | [diff] [blame] | 590 | next_node: |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 591 | info->curr_node = rb_next(info->curr_node); |
Theodore Ts'o | 3c37fc8 | 2008-10-25 11:39:08 -0400 | [diff] [blame] | 592 | if (info->curr_node) { |
| 593 | fname = rb_entry(info->curr_node, struct fname, |
| 594 | rb_hash); |
| 595 | info->curr_hash = fname->hash; |
| 596 | info->curr_minor_hash = fname->minor_hash; |
| 597 | } else { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 598 | if (info->next_hash == ~0) { |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 599 | ctx->pos = ext4_get_htree_eof(file); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 600 | break; |
| 601 | } |
| 602 | info->curr_hash = info->next_hash; |
| 603 | info->curr_minor_hash = 0; |
| 604 | } |
| 605 | } |
| 606 | finished: |
Al Viro | 725bebb | 2013-05-17 16:08:53 -0400 | [diff] [blame] | 607 | info->last_pos = ctx->pos; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 608 | return 0; |
| 609 | } |
| 610 | |
Theodore Ts'o | 6bc445e | 2015-05-31 13:34:57 -0400 | [diff] [blame] | 611 | static int ext4_dir_open(struct inode * inode, struct file * filp) |
| 612 | { |
| 613 | if (ext4_encrypted_inode(inode)) |
Jaegeuk Kim | a7550b3 | 2016-07-10 14:01:03 -0400 | [diff] [blame] | 614 | return fscrypt_get_encryption_info(inode) ? -EACCES : 0; |
Theodore Ts'o | 6bc445e | 2015-05-31 13:34:57 -0400 | [diff] [blame] | 615 | return 0; |
| 616 | } |
| 617 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 618 | static int ext4_release_dir(struct inode *inode, struct file *filp) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 619 | { |
Andrew Morton | 63f5793 | 2006-10-11 01:21:24 -0700 | [diff] [blame] | 620 | if (filp->private_data) |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 621 | ext4_htree_free_dir_info(filp->private_data); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 622 | |
| 623 | return 0; |
| 624 | } |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 625 | |
Darrick J. Wong | 40b163f | 2014-07-28 13:06:26 -0400 | [diff] [blame] | 626 | int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, void *buf, |
| 627 | int buf_size) |
| 628 | { |
| 629 | struct ext4_dir_entry_2 *de; |
| 630 | int nlen, rlen; |
| 631 | unsigned int offset = 0; |
| 632 | char *top; |
| 633 | |
| 634 | de = (struct ext4_dir_entry_2 *)buf; |
| 635 | top = buf + buf_size; |
| 636 | while ((char *) de < top) { |
| 637 | if (ext4_check_dir_entry(dir, NULL, de, bh, |
| 638 | buf, buf_size, offset)) |
Darrick J. Wong | 6a797d2 | 2015-10-17 16:16:04 -0400 | [diff] [blame] | 639 | return -EFSCORRUPTED; |
Darrick J. Wong | 40b163f | 2014-07-28 13:06:26 -0400 | [diff] [blame] | 640 | nlen = EXT4_DIR_REC_LEN(de->name_len); |
| 641 | rlen = ext4_rec_len_from_disk(de->rec_len, buf_size); |
| 642 | de = (struct ext4_dir_entry_2 *)((char *)de + rlen); |
| 643 | offset += rlen; |
| 644 | } |
| 645 | if ((char *) de > top) |
Darrick J. Wong | 6a797d2 | 2015-10-17 16:16:04 -0400 | [diff] [blame] | 646 | return -EFSCORRUPTED; |
Darrick J. Wong | 40b163f | 2014-07-28 13:06:26 -0400 | [diff] [blame] | 647 | |
| 648 | return 0; |
| 649 | } |
| 650 | |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 651 | const struct file_operations ext4_dir_operations = { |
| 652 | .llseek = ext4_dir_llseek, |
| 653 | .read = generic_read_dir, |
Al Viro | ae05327 | 2016-05-12 20:36:01 -0400 | [diff] [blame] | 654 | .iterate_shared = ext4_readdir, |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 655 | .unlocked_ioctl = ext4_ioctl, |
| 656 | #ifdef CONFIG_COMPAT |
| 657 | .compat_ioctl = ext4_compat_ioctl, |
| 658 | #endif |
| 659 | .fsync = ext4_sync_file, |
Theodore Ts'o | 6bc445e | 2015-05-31 13:34:57 -0400 | [diff] [blame] | 660 | .open = ext4_dir_open, |
Fan Yong | d1f5273 | 2012-03-18 22:44:40 -0400 | [diff] [blame] | 661 | .release = ext4_release_dir, |
| 662 | }; |