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authorEric Biggers <ebiggers@google.com>2018-01-12 07:27:00 +0300
committerTheodore Ts'o <tytso@mit.edu>2018-01-12 07:27:00 +0300
commit0e4dda290779aa5ceaa5ee8c79961146124d78e7 (patch)
tree324ea82f14edc64c99465f49887f052ef3aa4640 /fs/ubifs/dir.c
parent6b46d444146eb8d0b99562795cea8086639d7282 (diff)
downloadlinux-0e4dda290779aa5ceaa5ee8c79961146124d78e7.tar.xz
ubifs: switch to fscrypt ->symlink() helper functions
Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ubifs/dir.c')
-rw-r--r--fs/ubifs/dir.c55
1 files changed, 12 insertions, 43 deletions
diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index ef820f803176..518c10255881 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -1149,38 +1149,24 @@ static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
struct ubifs_info *c = dir->i_sb->s_fs_info;
int err, len = strlen(symname);
int sz_change = CALC_DENT_SIZE(len);
- struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
- struct fscrypt_symlink_data *sd = NULL;
+ struct fscrypt_str disk_link;
struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
.new_ino_d = ALIGN(len, 8),
.dirtied_ino = 1 };
struct fscrypt_name nm;
- if (ubifs_crypt_is_encrypted(dir)) {
- err = fscrypt_get_encryption_info(dir);
- if (err)
- goto out_budg;
-
- if (!fscrypt_has_encryption_key(dir)) {
- err = -EPERM;
- goto out_budg;
- }
+ dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry,
+ symname, dir->i_ino);
- disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
- sizeof(struct fscrypt_symlink_data));
- }
+ err = fscrypt_prepare_symlink(dir, symname, len, UBIFS_MAX_INO_DATA,
+ &disk_link);
+ if (err)
+ return err;
/*
* Budget request settings: new inode, new direntry and changing parent
* directory inode.
*/
-
- dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry,
- symname, dir->i_ino);
-
- if (disk_link.len > UBIFS_MAX_INO_DATA)
- return -ENAMETOOLONG;
-
err = ubifs_budget_space(c, &req);
if (err)
return err;
@@ -1202,36 +1188,20 @@ static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
goto out_inode;
}
- if (ubifs_crypt_is_encrypted(dir)) {
- struct qstr istr = QSTR_INIT(symname, len);
- struct fscrypt_str ostr;
-
- sd = kzalloc(disk_link.len, GFP_NOFS);
- if (!sd) {
- err = -ENOMEM;
- goto out_inode;
- }
-
- ostr.name = sd->encrypted_path;
- ostr.len = disk_link.len;
-
- err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
+ if (IS_ENCRYPTED(inode)) {
+ disk_link.name = ui->data; /* encrypt directly into ui->data */
+ err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
if (err)
goto out_inode;
-
- sd->len = cpu_to_le16(ostr.len);
- disk_link.name = (char *)sd;
} else {
+ memcpy(ui->data, disk_link.name, disk_link.len);
inode->i_link = ui->data;
}
- memcpy(ui->data, disk_link.name, disk_link.len);
- ((char *)ui->data)[disk_link.len - 1] = '\0';
-
/*
* The terminating zero byte is not written to the flash media and it
* is put just to make later in-memory string processing simpler. Thus,
- * data length is @len, not @len + %1.
+ * data length is @disk_link.len - 1, not @disk_link.len.
*/
ui->data_len = disk_link.len - 1;
inode->i_size = ubifs_inode(inode)->ui_size = disk_link.len - 1;
@@ -1265,7 +1235,6 @@ out_fname:
fscrypt_free_filename(&nm);
out_budg:
ubifs_release_budget(c, &req);
- kfree(sd);
return err;
}