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Message-Id: <1428012659-12709-16-git-send-email-tytso@mit.edu>
Date: Thu, 2 Apr 2015 18:10:52 -0400
From: Theodore Ts'o <tytso@....edu>
To: Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc: jaegeuk@...nel.org, mhalcrow@...gle.com,
Theodore Ts'o <tytso@....edu>
Subject: [PATCH 15/22] ext4: teach ext4_htree_store_dirent() to store decrypted filenames
For encrypted directories, we need to pass in a separate parameter for
the decrypted filename, since the directory entry contains the
encrypted filename.
Change-Id: I2d1a78e65cb81152cae108ce7faadc28b52e0abe
Signed-off-by: Theodore Ts'o <tytso@....edu>
---
fs/ext4/dir.c | 15 ++++++++++-----
fs/ext4/ext4.h | 5 +++--
fs/ext4/inline.c | 7 +++++--
fs/ext4/namei.c | 21 +++++++++++++++++----
4 files changed, 35 insertions(+), 13 deletions(-)
diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index c24143e..f67f955 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -384,10 +384,15 @@ void ext4_htree_free_dir_info(struct dir_private_info *p)
/*
* Given a directory entry, enter it into the fname rb tree.
+ *
+ * When filename encryption is enabled, the dirent will hold the
+ * encrypted filename, while the htree will hold decrypted filename.
+ * The decrypted filename is passed in via ent_name. parameter.
*/
int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
__u32 minor_hash,
- struct ext4_dir_entry_2 *dirent)
+ struct ext4_dir_entry_2 *dirent,
+ struct ext4_str *ent_name)
{
struct rb_node **p, *parent = NULL;
struct fname *fname, *new_fn;
@@ -398,17 +403,17 @@ int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
p = &info->root.rb_node;
/* Create and allocate the fname structure */
- len = sizeof(struct fname) + dirent->name_len + 1;
+ len = sizeof(struct fname) + ent_name->len + 1;
new_fn = kzalloc(len, GFP_KERNEL);
if (!new_fn)
return -ENOMEM;
new_fn->hash = hash;
new_fn->minor_hash = minor_hash;
new_fn->inode = le32_to_cpu(dirent->inode);
- new_fn->name_len = dirent->name_len;
+ new_fn->name_len = ent_name->len;
new_fn->file_type = dirent->file_type;
- memcpy(new_fn->name, dirent->name, dirent->name_len);
- new_fn->name[dirent->name_len] = 0;
+ memcpy(new_fn->name, ent_name->name, ent_name->len);
+ new_fn->name[ent_name->len] = 0;
while (*p) {
parent = *p;
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index fe1a807..576321c 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2113,8 +2113,9 @@ extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
(de), (bh), (buf), (size), (offset)))
extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
- __u32 minor_hash,
- struct ext4_dir_entry_2 *dirent);
+ __u32 minor_hash,
+ struct ext4_dir_entry_2 *dirent,
+ struct ext4_str *ent_name);
extern void ext4_htree_free_dir_info(struct dir_private_info *p);
extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
struct buffer_head *bh,
diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index 4b143fe..056ef06 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -1327,6 +1327,7 @@ int htree_inlinedir_to_tree(struct file *dir_file,
struct ext4_iloc iloc;
void *dir_buf = NULL;
struct ext4_dir_entry_2 fake;
+ struct ext4_str tmp_str;
ret = ext4_get_inode_loc(inode, &iloc);
if (ret)
@@ -1398,8 +1399,10 @@ int htree_inlinedir_to_tree(struct file *dir_file,
continue;
if (de->inode == 0)
continue;
- err = ext4_htree_store_dirent(dir_file,
- hinfo->hash, hinfo->minor_hash, de);
+ tmp_str.name = de->name;
+ tmp_str.len = de->name_len;
+ err = ext4_htree_store_dirent(dir_file, hinfo->hash,
+ hinfo->minor_hash, de, &tmp_str);
if (err) {
count = err;
goto out;
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 262aa1c..57cae22 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -880,6 +880,7 @@ static int htree_dirblock_to_tree(struct file *dir_file,
struct buffer_head *bh;
struct ext4_dir_entry_2 *de, *top;
int err = 0, count = 0;
+ struct ext4_str tmp_str;
dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n",
(unsigned long)block));
@@ -906,8 +907,11 @@ static int htree_dirblock_to_tree(struct file *dir_file,
continue;
if (de->inode == 0)
continue;
- if ((err = ext4_htree_store_dirent(dir_file,
- hinfo->hash, hinfo->minor_hash, de)) != 0) {
+ tmp_str.name = de->name;
+ tmp_str.len = de->name_len;
+ err = ext4_htree_store_dirent(dir_file,
+ hinfo->hash, hinfo->minor_hash, de, &tmp_str);
+ if (err != 0) {
brelse(bh);
return err;
}
@@ -937,6 +941,7 @@ int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
int count = 0;
int ret, err;
__u32 hashval;
+ struct ext4_str tmp_str;
dxtrace(printk(KERN_DEBUG "In htree_fill_tree, start hash: %x:%x\n",
start_hash, start_minor_hash));
@@ -972,14 +977,22 @@ int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
/* Add '.' and '..' from the htree header */
if (!start_hash && !start_minor_hash) {
de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data;
- if ((err = ext4_htree_store_dirent(dir_file, 0, 0, de)) != 0)
+ tmp_str.name = de->name;
+ tmp_str.len = de->name_len;
+ err = ext4_htree_store_dirent(dir_file, 0, 0,
+ de, &tmp_str);
+ if (err != 0)
goto errout;
count++;
}
if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) {
de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data;
de = ext4_next_entry(de, dir->i_sb->s_blocksize);
- if ((err = ext4_htree_store_dirent(dir_file, 2, 0, de)) != 0)
+ tmp_str.name = de->name;
+ tmp_str.len = de->name_len;
+ err = ext4_htree_store_dirent(dir_file, 2, 0,
+ de, &tmp_str);
+ if (err != 0)
goto errout;
count++;
}
--
2.3.0
--
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