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ext4 crypto: teach ext4_htree_store_dirent() to store decrypted filenames

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For encrypted directories, we need to pass in a separate parameter for
the decrypted filename, since the directory entry contains the
encrypted filename.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o
2015-04-12 00:56:26 -04:00
parent d5d0e8c720
commit 2f61830ae3
4 changed files with 35 additions and 13 deletions
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15
fs/ext4/dir.c
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@@ -382,10 +382,15 @@ 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;
@@ -396,17 +401,17 @@ 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;