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ecryptfs: make show_options reflect actual mount options

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Change ecryptfs_show_options to reflect the actual mount options in use.
Note that this does away with the "dir=" output, which is not a valid mount
option and appears to be unused.

Mount options such as "ecryptfs_verbose" and "ecryptfs_xattr_metadata" are
somewhat indeterminate for a given fs, but in any case the reported mount
options can be used in a new mount command to get the same behavior.

[akpm@linux-foundation.org: fix printk warning]
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Acked-by: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric Sandeen 2008-02-06 01:38:34 -08:00 committed by Linus Torvalds
parent 8e3a6f16ba
commit 99db6e4a97
1 changed files with 30 additions and 20 deletions
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50
fs/ecryptfs/super.c
View file

@ -156,32 +156,42 @@ static void ecryptfs_clear_inode(struct inode *inode)
/**
* ecryptfs_show_options
*
* Prints the directory we are currently mounted over.
* Returns zero on success; non-zero otherwise
* Prints the mount options for a given superblock.
* Returns zero; does not fail.
*/
static int ecryptfs_show_options(struct seq_file *m, struct vfsmount *mnt)
{
struct super_block *sb = mnt->mnt_sb;
struct dentry *lower_root_dentry = ecryptfs_dentry_to_lower(sb->s_root);
struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(sb->s_root);
char *tmp_page;
char *path;
int rc = 0;
struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
&ecryptfs_superblock_to_private(sb)->mount_crypt_stat;
struct ecryptfs_global_auth_tok *walker;
tmp_page = (char *)__get_free_page(GFP_KERNEL);
if (!tmp_page) {
rc = -ENOMEM;
goto out;
mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex);
list_for_each_entry(walker,
&mount_crypt_stat->global_auth_tok_list,
mount_crypt_stat_list) {
seq_printf(m, ",ecryptfs_sig=%s", walker->sig);
}
path = d_path(lower_root_dentry, lower_mnt, tmp_page, PAGE_SIZE);
if (IS_ERR(path)) {
rc = PTR_ERR(path);
goto out;
}
seq_printf(m, ",dir=%s", path);
free_page((unsigned long)tmp_page);
out:
return rc;
mutex_unlock(&mount_crypt_stat->global_auth_tok_list_mutex);
/* Note this is global and probably shouldn't be a mount option */
if (ecryptfs_verbosity)
seq_printf(m, ",ecryptfs_debug=%d\n", ecryptfs_verbosity);
seq_printf(m, ",ecryptfs_cipher=%s",
mount_crypt_stat->global_default_cipher_name);
if (mount_crypt_stat->global_default_cipher_key_size)
seq_printf(m, ",ecryptfs_key_bytes=%zd",
mount_crypt_stat->global_default_cipher_key_size);
if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)
seq_printf(m, ",ecryptfs_passthrough");
if (mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED)
seq_printf(m, ",ecryptfs_xattr_metadata");
if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
seq_printf(m, ",ecryptfs_encrypted_view");
return 0;
}
const struct super_operations ecryptfs_sops = {