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/*
* Copyright (c) 2003-2009 Erez Zadok
* Copyright (c) 2003-2006 Charles P. Wright
* Copyright (c) 2005-2007 Josef 'Jeff' Sipek
* Copyright (c) 2005-2006 Junjiro Okajima
* Copyright (c) 2005 Arun M. Krishnakumar
* Copyright (c) 2004-2006 David P. Quigley
* Copyright (c) 2003-2004 Mohammad Nayyer Zubair
* Copyright (c) 2003 Puja Gupta
* Copyright (c) 2003 Harikesavan Krishnan
* Copyright (c) 2003-2009 Stony Brook University
* Copyright (c) 2003-2009 The Research Foundation of SUNY
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include "union.h"
/*
* returns the right n_link value based on the inode type
*/
int unionfs_get_nlinks(const struct inode *inode)
{
/* don't bother to do all the work since we're unlinked */
if (inode->i_nlink == 0)
return 0;
if (!S_ISDIR(inode->i_mode))
return unionfs_lower_inode(inode)->i_nlink;
/*
* For directories, we return 1. The only place that could cares
* about links is readdir, and there's d_type there so even that
* doesn't matter.
*/
return 1;
}
/* copy a/m/ctime from the lower branch with the newest times */
void unionfs_copy_attr_times(struct inode *upper)
{
int bindex;
struct inode *lower;
if (!upper)
return;
if (ibstart(upper) < 0) {
#ifdef CONFIG_UNION_FS_DEBUG
WARN_ON(ibstart(upper) < 0);
#endif /* CONFIG_UNION_FS_DEBUG */
return;
}
for (bindex = ibstart(upper); bindex <= ibend(upper); bindex++) {
lower = unionfs_lower_inode_idx(upper, bindex);
if (!lower)
continue; /* not all lower dir objects may exist */
if (unlikely(timespec_compare(&upper->i_mtime,
&lower->i_mtime) < 0))
upper->i_mtime = lower->i_mtime;
if (unlikely(timespec_compare(&upper->i_ctime,
&lower->i_ctime) < 0))
upper->i_ctime = lower->i_ctime;
if (unlikely(timespec_compare(&upper->i_atime,
&lower->i_atime) < 0))
upper->i_atime = lower->i_atime;
}
}
/*
* A unionfs/fanout version of fsstack_copy_attr_all. Uses a
* unionfs_get_nlinks to properly calcluate the number of links to a file.
* Also, copies the max() of all a/m/ctimes for all lower inodes (which is
* important if the lower inode is a directory type)
*/
void unionfs_copy_attr_all(struct inode *dest,
const struct inode *src)
{
dest->i_mode = src->i_mode;
dest->i_uid = src->i_uid;
dest->i_gid = src->i_gid;
dest->i_rdev = src->i_rdev;
unionfs_copy_attr_times(dest);
dest->i_blkbits = src->i_blkbits;
dest->i_flags = src->i_flags;
/*
* Update the nlinks AFTER updating the above fields, because the
* get_links callback may depend on them.
*/
dest->i_nlink = unionfs_get_nlinks(dest);
}
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