Mailinglist Archive: opensuse (2459 mails)

[Anders Johansson <ajh@xxxxxxxxxx>]

On Tue, 2008-03-25 at 20:26 -0600, Boyd Lynn Gerber wrote:
> > The directories *are* changing. Specifically, the .. dentry is changed
> > to point to the inode of the new parent directory. In your ls output I'm
> > willing to bet that you moved the directory to another partition, which
> > means your directory got a new inode number, which in turn means all ..
> > dentries in all subdirectories had to be updated
> >
> > So to my mind it is correct that the mtime gets updated. I see it more
> > as a problem with ext that it doesn't get updated there
>
> They did not change partitions.  They were all in /home/zenez/  This
> directory was getting to many directories to follow.  I did the
> following
>
> mkdir etc-new
> mv etc etc.* etc-new/
> mv etc-new etc
>
> The above was the result.

Ah, ok, I thought you were showing the contents of the moved directory.

Well then my theory above still holds. All directories had to have an
updated .. dentry, which means they were modified

if (new_parent && src_is_directory) {
                /*
                 * Rewrite the ".." entry to point to the new
                 * directory.
                 */
                error = xfs_dir_replace(tp, src_ip, "..", 2,
target_dp->i_ino,
                                        &first_block, &free_list,
spaceres);
                ASSERT(error != EEXIST);
                if (error)
                        goto abort_return;
                xfs_ichgtime(src_ip, XFS_ICHGTIME_MOD |
XFS_ICHGTIME_CHG);

is the code in xfs that does it. So if it gets a new .., update MOD
(mtime) and CHG (ctime). The corresponding code in ext3 is

 old_inode->i_ctime = CURRENT_TIME_SEC;

so it only changes the ctime.

In other words, it is a conscious choice by the xfs programmers, and
while it's unfortunate that the file systems behave differently, I still
think xfs got it right here, because the directory is modified

Anders

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