#include <linux/uio.h>
#include "overlayfs.h"
-static struct file *ovl_open_realfile(const struct file *file)
+static char ovl_whatisit(struct inode *inode, struct inode *realinode)
+{
+ if (realinode != ovl_inode_upper(inode))
+ return 'l';
+ if (ovl_has_upperdata(inode))
+ return 'u';
+ else
+ return 'm';
+}
+
+static struct file *ovl_open_realfile(const struct file *file,
+ struct inode *realinode)
{
struct inode *inode = file_inode(file);
- struct inode *upperinode = ovl_inode_upper(inode);
- struct inode *realinode = upperinode ?: ovl_inode_lower(inode);
struct file *realfile;
const struct cred *old_cred;
revert_creds(old_cred);
pr_debug("open(%p[%pD2/%c], 0%o) -> (%p, 0%o)\n",
- file, file, upperinode ? 'u' : 'l', file->f_flags,
+ file, file, ovl_whatisit(inode, realinode), file->f_flags,
realfile, IS_ERR(realfile) ? 0 : realfile->f_flags);
return realfile;
return 0;
}
-static int ovl_real_fdget(const struct file *file, struct fd *real)
+static int ovl_real_fdget_meta(const struct file *file, struct fd *real,
+ bool allow_meta)
{
struct inode *inode = file_inode(file);
+ struct inode *realinode;
real->flags = 0;
real->file = file->private_data;
+ if (allow_meta)
+ realinode = ovl_inode_real(inode);
+ else
+ realinode = ovl_inode_realdata(inode);
+
/* Has it been copied up since we'd opened it? */
- if (unlikely(file_inode(real->file) != ovl_inode_real(inode))) {
+ if (unlikely(file_inode(real->file) != realinode)) {
real->flags = FDPUT_FPUT;
- real->file = ovl_open_realfile(file);
+ real->file = ovl_open_realfile(file, realinode);
return PTR_ERR_OR_ZERO(real->file);
}
return 0;
}
+static int ovl_real_fdget(const struct file *file, struct fd *real)
+{
+ return ovl_real_fdget_meta(file, real, false);
+}
+
static int ovl_open(struct inode *inode, struct file *file)
{
struct dentry *dentry = file_dentry(file);
/* No longer need these flags, so don't pass them on to underlying fs */
file->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
- realfile = ovl_open_realfile(file);
+ realfile = ovl_open_realfile(file, ovl_inode_realdata(inode));
if (IS_ERR(realfile))
return PTR_ERR(realfile);
const struct cred *old_cred;
int ret;
- ret = ovl_real_fdget(file, &real);
+ ret = ovl_real_fdget_meta(file, &real, !datasync);
if (ret)
return ret;