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ovl: copy up file size as well

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Copy i_size of the underlying inode to the overlay inode in ovl_copyattr().

This is in preparation for stacking I/O operations on overlay files.

This patch shouldn't have any observable effect.

Remove stale comment from ovl_setattr() [spotted by Vivek Goyal].

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2018-07-18 15:44:41 +02:00
parent 5812160eb5
commit 46e5d0a390
2 changed files with 2 additions and 9 deletions
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9
fs/overlayfs/inode.c
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@ -22,15 +22,6 @@ int ovl_setattr(struct dentry *dentry, struct iattr *attr)
struct dentry *upperdentry;
const struct cred *old_cred;
/*
* Check for permissions before trying to copy-up. This is redundant
* since it will be rechecked later by ->setattr() on upper dentry. But
* without this, copy-up can be triggered by just about anybody.
*
* We don't initialize inode->size, which just means that
* inode_newsize_ok() will always check against MAX_LFS_FILESIZE and not
* check for a swapfile (which this won't be anyway).
*/
err = setattr_prepare(dentry, attr);
if (err)
return err;

2
fs/overlayfs/overlayfs.h
View File

@ -9,6 +9,7 @@
#include <linux/kernel.h>
#include <linux/uuid.h>
#include <linux/fs.h>
#include "ovl_entry.h"
enum ovl_path_type {
@ -348,6 +349,7 @@ static inline void ovl_copyattr(struct inode *from, struct inode *to)
to->i_atime = from->i_atime;
to->i_mtime = from->i_mtime;
to->i_ctime = from->i_ctime;
i_size_write(to, i_size_read(from));
}
static inline void ovl_copyflags(struct inode *from, struct inode *to)