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eCryptfs: do not try to open device files on mknod

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When creating device nodes, eCryptfs needs to delay actually opening the lower
persistent file until an application tries to open.  Device handles may not be
backed by anything when they first come into existence.

[Valdis.Kletnieks@vt.edu: build fix]
Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Cc: <Valdis.Kletnieks@vt.edu}
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michael Halcrow
2008-07-23 21:30:07 -07:00
committed by Linus Torvalds
parent 0a688ad713
commit 72b55fffd6
4 changed files with 42 additions and 13 deletions
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14
fs/ecryptfs/file.c
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@@ -199,6 +199,20 @@ static int ecryptfs_open(struct inode *inode, struct file *file)
"file must hence be opened RO\n", __func__);
goto out;
}
if (!ecryptfs_inode_to_private(inode)->lower_file) {
BUG_ON(!(crypt_stat->flags & ECRYPTFS_DELAY_PERSISTENT));
mutex_lock(&crypt_stat->cs_mutex);
crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
mutex_unlock(&crypt_stat->cs_mutex);
rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
if (rc) {
printk(KERN_ERR "%s: Error attempting to initialize "
"the persistent file for the dentry with name "
"[%s]; rc = [%d]\n", __func__,
ecryptfs_dentry->d_name.name, rc);
goto out;
}
}
ecryptfs_set_file_lower(
file, ecryptfs_inode_to_private(inode)->lower_file);
if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {