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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
Download patch file Download diff file Expand all files Collapse all files

6
fs/ecryptfs/inode.c
View file

@ -308,7 +308,8 @@ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry,
d_add(dentry, NULL);
goto out;
}
rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 1);
rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb,
ECRYPTFS_INTERPOSE_FLAG_D_ADD);
if (rc) {
ecryptfs_printk(KERN_ERR, "Error interposing\n");
goto out_dput;
@ -537,7 +538,8 @@ ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
if (rc || !lower_dentry->d_inode)
goto out;
rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb,
ECRYPTFS_INTERPOSE_FLAG_DELAY_PERSISTENT_FILE);
if (rc)
goto out;
fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);