From: Vivek Goyal <vgoyal@redhat.com>
To: Miklos Szeredi <mszeredi@redhat.com>
Cc: linux-unionfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 04/35] ovl: copy up times
Date: Fri, 13 Apr 2018 10:23:13 -0400 [thread overview]
Message-ID: <20180413142313.GA2706@redhat.com> (raw)
In-Reply-To: <20180412150826.20988-5-mszeredi@redhat.com>
On Thu, Apr 12, 2018 at 05:07:55PM +0200, Miklos Szeredi wrote:
> Copy up mtime and ctime to overlay inode after times in real object are
> modified. Be careful not to dirty cachelines when not necessary.
>
> This is in preparation for moving overlay functionality out of the VFS.
>
> This patch shouldn't have any observable effect.
So there are bunch of operations which will change inode ctime. I had
missed this in my metadata only copy up patch series and that would broken
atime updates in some cases.
Vivek
>
> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
> ---
> fs/overlayfs/dir.c | 5 +++++
> fs/overlayfs/inode.c | 1 +
> fs/overlayfs/overlayfs.h | 7 +++++++
> fs/overlayfs/util.c | 19 +++++++++++++++++++
> 4 files changed, 32 insertions(+)
>
> diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
> index 839709c7803a..cd0fa2363723 100644
> --- a/fs/overlayfs/dir.c
> +++ b/fs/overlayfs/dir.c
> @@ -507,6 +507,7 @@ static int ovl_create_or_link(struct dentry *dentry, struct inode *inode,
> else
> err = ovl_create_over_whiteout(dentry, inode, attr,
> hardlink);
> + ovl_copytimes_with_parent(dentry);
> }
> out_revert_creds:
> revert_creds(old_cred);
> @@ -768,6 +769,7 @@ static int ovl_do_remove(struct dentry *dentry, bool is_dir)
> drop_nlink(dentry->d_inode);
> }
> ovl_nlink_end(dentry, locked);
> + ovl_copytimes_with_parent(dentry);
> out_drop_write:
> ovl_drop_write(dentry);
> out:
> @@ -1079,6 +1081,9 @@ static int ovl_rename(struct inode *olddir, struct dentry *old,
> ovl_dentry_version_inc(new->d_parent, ovl_type_origin(old) ||
> (d_inode(new) && ovl_type_origin(new)));
>
> + ovl_copytimes_with_parent(old);
> + ovl_copytimes_with_parent(new);
> +
> out_dput:
> dput(newdentry);
> out_dput_old:
> diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
> index 6e3815fb006b..33635106c5f7 100644
> --- a/fs/overlayfs/inode.c
> +++ b/fs/overlayfs/inode.c
> @@ -303,6 +303,7 @@ int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name,
> err = vfs_removexattr(realdentry, name);
> }
> revert_creds(old_cred);
> + ovl_copytimes(d_inode(dentry));
>
> out_drop_write:
> ovl_drop_write(dentry);
> diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
> index e0b7de799f6b..eef720ef0f07 100644
> --- a/fs/overlayfs/overlayfs.h
> +++ b/fs/overlayfs/overlayfs.h
> @@ -258,6 +258,13 @@ bool ovl_need_index(struct dentry *dentry);
> int ovl_nlink_start(struct dentry *dentry, bool *locked);
> void ovl_nlink_end(struct dentry *dentry, bool locked);
> int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir);
> +void ovl_copytimes(struct inode *inode);
> +
> +static inline void ovl_copytimes_with_parent(struct dentry *dentry)
> +{
> + ovl_copytimes(d_inode(dentry));
> + ovl_copytimes(d_inode(dentry->d_parent));
> +}
>
> static inline bool ovl_is_impuredir(struct dentry *dentry)
> {
> diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
> index 6f1078028c66..11e62e70733a 100644
> --- a/fs/overlayfs/util.c
> +++ b/fs/overlayfs/util.c
> @@ -675,3 +675,22 @@ int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir)
> pr_err("overlayfs: failed to lock workdir+upperdir\n");
> return -EIO;
> }
> +
> +void ovl_copytimes(struct inode *inode)
> +{
> + struct inode *upperinode;
> +
> + if (!inode)
> + return;
> +
> + upperinode = ovl_inode_upper(inode);
> +
> + if (!upperinode)
> + return;
> +
> + if ((!timespec_equal(&inode->i_mtime, &upperinode->i_mtime) ||
> + !timespec_equal(&inode->i_ctime, &upperinode->i_ctime))) {
> + inode->i_mtime = upperinode->i_mtime;
> + inode->i_ctime = upperinode->i_ctime;
> + }
> +}
> --
> 2.14.3
>
> --
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next prev parent reply other threads:[~2018-04-13 14:23 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-12 15:07 [RFC PATCH 00/35] overlayfs: stack file operations Miklos Szeredi
2018-04-12 15:07 ` [RFC PATCH 01/35] vfs: clean up dedup Miklos Szeredi
2018-04-12 16:25 ` Matthew Wilcox
2018-04-12 17:24 ` Miklos Szeredi
2018-04-12 15:07 ` [RFC PATCH 02/35] vfs: add path_open() Miklos Szeredi
2018-04-12 16:38 ` Matthew Wilcox
2018-04-12 15:07 ` [RFC PATCH 03/35] vfs: optionally don't account file in nr_files Miklos Szeredi
2018-04-12 15:07 ` [RFC PATCH 04/35] ovl: copy up times Miklos Szeredi
2018-04-13 8:25 ` Amir Goldstein
2018-04-13 14:23 ` Vivek Goyal [this message]
2018-04-12 15:07 ` [RFC PATCH 05/35] ovl: copy up inode flags Miklos Szeredi
2018-04-12 15:07 ` [RFC PATCH 06/35] Revert "Revert "ovl: get_write_access() in truncate"" Miklos Szeredi
2018-04-12 15:07 ` [RFC PATCH 07/35] ovl: copy up file size as well Miklos Szeredi
2018-04-24 18:10 ` Vivek Goyal
2018-04-12 15:07 ` [RFC PATCH 08/35] ovl: deal with overlay files in ovl_d_real() Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 09/35] ovl: stack file ops Miklos Szeredi
2018-04-26 14:13 ` Vivek Goyal
2018-04-26 14:43 ` Miklos Szeredi
2018-04-26 14:56 ` Vivek Goyal
2018-04-26 15:01 ` Miklos Szeredi
2018-04-26 15:13 ` Vivek Goyal
2018-04-26 15:21 ` Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 10/35] ovl: add helper to return real file Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 11/35] ovl: readd read_iter Miklos Szeredi
2018-04-13 13:35 ` Amir Goldstein
2018-04-12 15:08 ` [RFC PATCH 12/35] ovl: readd write_iter Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 13/35] ovl: readd fsync Miklos Szeredi
2018-04-23 13:36 ` Vivek Goyal
2018-04-23 13:39 ` Miklos Szeredi
2018-04-23 13:53 ` Vivek Goyal
2018-04-23 14:09 ` Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 14/35] ovl: readd mmap Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 15/35] ovl: readd fallocate Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 16/35] ovl: readd lsattr/chattr support Miklos Szeredi
2018-04-13 14:48 ` Amir Goldstein
2018-04-17 19:51 ` Amir Goldstein
2018-04-22 8:35 ` Amir Goldstein
2018-04-22 15:18 ` Amir Goldstein
2018-04-23 10:21 ` Miklos Szeredi
2018-04-23 10:28 ` Miklos Szeredi
2018-04-23 6:11 ` Ritesh Harjani
2018-04-12 15:08 ` [RFC PATCH 17/35] ovl: readd fiemap Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 18/35] ovl: readd O_DIRECT support Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 19/35] ovl: readd reflink/copyfile/dedup support Miklos Szeredi
2018-04-17 20:31 ` Amir Goldstein
2018-04-18 8:39 ` Amir Goldstein
2018-05-03 16:04 ` Miklos Szeredi
2018-05-03 19:48 ` Amir Goldstein
2018-04-12 15:08 ` [RFC PATCH 20/35] vfs: don't open real Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 21/35] vfs: add f_op->pre_mmap() Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 22/35] ovl: copy-up on MAP_SHARED Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 23/35] vfs: simplify dentry_open() Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 24/35] Revert "ovl: fix relatime for directories" Miklos Szeredi
2018-04-13 14:02 ` Amir Goldstein
2018-04-13 15:55 ` Vivek Goyal
2018-04-12 15:08 ` [RFC PATCH 25/35] Revert "vfs: update ovl inode before relatime check" Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 26/35] Revert "ovl: fix may_write_real() for overlayfs directories" Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 27/35] Revert "ovl: don't allow writing ioctl on lower layer" Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 28/35] Revert "vfs: add flags to d_real()" Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 29/35] Revert "vfs: do get_write_access() on upper layer of overlayfs" Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 30/35] Revert "vfs: make argument of d_real_inode() const" Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 31/35] Revert "vfs: add d_real_inode() helper" Miklos Szeredi
2018-04-18 8:19 ` Amir Goldstein
2018-04-18 11:42 ` Miklos Szeredi
2018-04-18 13:38 ` Steven Rostedt
2018-04-18 13:49 ` Miklos Szeredi
2018-04-18 13:56 ` Steven Rostedt
2018-04-19 19:54 ` Vivek Goyal
2018-04-20 9:14 ` Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 32/35] Partially revert "locks: fix file locking on overlayfs" Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 33/35] Revert "fsnotify: support overlayfs" Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 34/35] vfs: simplify d_op->d_real() Miklos Szeredi
2018-04-12 15:08 ` [RFC PATCH 35/35] ovl: fix documentation of non-standard behavior Miklos Szeredi
2018-04-13 11:23 ` Amir Goldstein
2018-04-25 14:49 ` [RFC PATCH 00/35] overlayfs: stack file operations J. R. Okajima
2018-04-25 19:44 ` Miklos Szeredi
2018-05-04 15:23 ` Miklos Szeredi
2018-05-05 16:37 ` Amir Goldstein
2018-05-08 14:25 ` Miklos Szeredi
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