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ubifs: switch to fscrypt ->symlink() helper functions

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Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Eric Biggers 2018-01-11 23:27:00 -05:00 committed by Theodore Ts'o
parent 6b46d44414
commit 0e4dda2907
1 changed files with 12 additions and 43 deletions
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55
fs/ubifs/dir.c
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@ -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);
dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry,
symname, dir->i_ino);
err = fscrypt_prepare_symlink(dir, symname, len, UBIFS_MAX_INO_DATA,
&disk_link);
if (err)
goto out_budg;
if (!fscrypt_has_encryption_key(dir)) {
err = -EPERM;
goto out_budg;
}
disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
sizeof(struct fscrypt_symlink_data));
}
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;
}