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Diffstat (limited to 'fs/ext4/namei.c')
-rw-r--r--fs/ext4/namei.c40
1 files changed, 6 insertions, 34 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index a43e6617b351..314c0d3b3fa9 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -179,30 +179,6 @@ static struct buffer_head * ext4_dx_find_entry(struct inode *dir,
179static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry, 179static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
180 struct inode *inode); 180 struct inode *inode);
181 181
182unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
183{
184 unsigned len = le16_to_cpu(dlen);
185
186 if (len == EXT4_MAX_REC_LEN || len == 0)
187 return blocksize;
188 return (len & 65532) | ((len & 3) << 16);
189}
190
191__le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
192{
193 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
194 BUG();
195 if (len < 65536)
196 return cpu_to_le16(len);
197 if (len == blocksize) {
198 if (blocksize == 65536)
199 return cpu_to_le16(EXT4_MAX_REC_LEN);
200 else
201 return cpu_to_le16(0);
202 }
203 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
204}
205
206/* 182/*
207 * p is at least 6 bytes before the end of page 183 * p is at least 6 bytes before the end of page
208 */ 184 */
@@ -605,7 +581,7 @@ static int htree_dirblock_to_tree(struct file *dir_file,
605 dir->i_sb->s_blocksize - 581 dir->i_sb->s_blocksize -
606 EXT4_DIR_REC_LEN(0)); 582 EXT4_DIR_REC_LEN(0));
607 for (; de < top; de = ext4_next_entry(de, dir->i_sb->s_blocksize)) { 583 for (; de < top; de = ext4_next_entry(de, dir->i_sb->s_blocksize)) {
608 if (!ext4_check_dir_entry("htree_dirblock_to_tree", dir, de, bh, 584 if (!ext4_check_dir_entry(dir, de, bh,
609 (block<<EXT4_BLOCK_SIZE_BITS(dir->i_sb)) 585 (block<<EXT4_BLOCK_SIZE_BITS(dir->i_sb))
610 +((char *)de - bh->b_data))) { 586 +((char *)de - bh->b_data))) {
611 /* On error, skip the f_pos to the next block. */ 587 /* On error, skip the f_pos to the next block. */
@@ -844,8 +820,7 @@ static inline int search_dirblock(struct buffer_head *bh,
844 if ((char *) de + namelen <= dlimit && 820 if ((char *) de + namelen <= dlimit &&
845 ext4_match (namelen, name, de)) { 821 ext4_match (namelen, name, de)) {
846 /* found a match - just to be sure, do a full check */ 822 /* found a match - just to be sure, do a full check */
847 if (!ext4_check_dir_entry("ext4_find_entry", 823 if (!ext4_check_dir_entry(dir, de, bh, offset))
848 dir, de, bh, offset))
849 return -1; 824 return -1;
850 *res_dir = de; 825 *res_dir = de;
851 return 1; 826 return 1;
@@ -1019,7 +994,7 @@ static struct buffer_head * ext4_dx_find_entry(struct inode *dir, const struct q
1019 int off = (block << EXT4_BLOCK_SIZE_BITS(sb)) 994 int off = (block << EXT4_BLOCK_SIZE_BITS(sb))
1020 + ((char *) de - bh->b_data); 995 + ((char *) de - bh->b_data);
1021 996
1022 if (!ext4_check_dir_entry(__func__, dir, de, bh, off)) { 997 if (!ext4_check_dir_entry(dir, de, bh, off)) {
1023 brelse(bh); 998 brelse(bh);
1024 *err = ERR_BAD_DX_DIR; 999 *err = ERR_BAD_DX_DIR;
1025 goto errout; 1000 goto errout;
@@ -1088,7 +1063,6 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, stru
1088struct dentry *ext4_get_parent(struct dentry *child) 1063struct dentry *ext4_get_parent(struct dentry *child)
1089{ 1064{
1090 __u32 ino; 1065 __u32 ino;
1091 struct inode *inode;
1092 static const struct qstr dotdot = { 1066 static const struct qstr dotdot = {
1093 .name = "..", 1067 .name = "..",
1094 .len = 2, 1068 .len = 2,
@@ -1097,7 +1071,6 @@ struct dentry *ext4_get_parent(struct dentry *child)
1097 struct buffer_head *bh; 1071 struct buffer_head *bh;
1098 1072
1099 bh = ext4_find_entry(child->d_inode, &dotdot, &de); 1073 bh = ext4_find_entry(child->d_inode, &dotdot, &de);
1100 inode = NULL;
1101 if (!bh) 1074 if (!bh)
1102 return ERR_PTR(-ENOENT); 1075 return ERR_PTR(-ENOENT);
1103 ino = le32_to_cpu(de->inode); 1076 ino = le32_to_cpu(de->inode);
@@ -1305,8 +1278,7 @@ static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry,
1305 de = (struct ext4_dir_entry_2 *)bh->b_data; 1278 de = (struct ext4_dir_entry_2 *)bh->b_data;
1306 top = bh->b_data + blocksize - reclen; 1279 top = bh->b_data + blocksize - reclen;
1307 while ((char *) de <= top) { 1280 while ((char *) de <= top) {
1308 if (!ext4_check_dir_entry("ext4_add_entry", dir, de, 1281 if (!ext4_check_dir_entry(dir, de, bh, offset))
1309 bh, offset))
1310 return -EIO; 1282 return -EIO;
1311 if (ext4_match(namelen, name, de)) 1283 if (ext4_match(namelen, name, de))
1312 return -EEXIST; 1284 return -EEXIST;
@@ -1673,7 +1645,7 @@ static int ext4_delete_entry(handle_t *handle,
1673 pde = NULL; 1645 pde = NULL;
1674 de = (struct ext4_dir_entry_2 *) bh->b_data; 1646 de = (struct ext4_dir_entry_2 *) bh->b_data;
1675 while (i < bh->b_size) { 1647 while (i < bh->b_size) {
1676 if (!ext4_check_dir_entry("ext4_delete_entry", dir, de, bh, i)) 1648 if (!ext4_check_dir_entry(dir, de, bh, i))
1677 return -EIO; 1649 return -EIO;
1678 if (de == de_del) { 1650 if (de == de_del) {
1679 BUFFER_TRACE(bh, "get_write_access"); 1651 BUFFER_TRACE(bh, "get_write_access");
@@ -1956,7 +1928,7 @@ static int empty_dir(struct inode *inode)
1956 } 1928 }
1957 de = (struct ext4_dir_entry_2 *) bh->b_data; 1929 de = (struct ext4_dir_entry_2 *) bh->b_data;
1958 } 1930 }
1959 if (!ext4_check_dir_entry("empty_dir", inode, de, bh, offset)) { 1931 if (!ext4_check_dir_entry(inode, de, bh, offset)) {
1960 de = (struct ext4_dir_entry_2 *)(bh->b_data + 1932 de = (struct ext4_dir_entry_2 *)(bh->b_data +
1961 sb->s_blocksize); 1933 sb->s_blocksize);
1962 offset = (offset | (sb->s_blocksize - 1)) + 1; 1934 offset = (offset | (sb->s_blocksize - 1)) + 1;