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SubjectRe: [RFC PATCH 24/35] Revert "ovl: fix relatime for directories"
On Thu, Apr 12, 2018 at 6:08 PM, Miklos Szeredi <mszeredi@redhat.com> wrote:
> This reverts commit cd91304e7190b4c4802f8e413ab2214b233e0260.
>
> Overlayfs no longer relies on the vfs correct atime handling.
>
> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
> ---
> fs/inode.c | 21 ++++-----------------
> fs/overlayfs/super.c | 3 ---
> include/linux/dcache.h | 3 ---
> 3 files changed, 4 insertions(+), 23 deletions(-)
>
> diff --git a/fs/inode.c b/fs/inode.c
> index ef362364d396..163715de8cb2 100644
> --- a/fs/inode.c
> +++ b/fs/inode.c
> @@ -1570,24 +1570,11 @@ EXPORT_SYMBOL(bmap);
> static void update_ovl_inode_times(struct dentry *dentry, struct inode *inode,
> bool rcu)
> {
> - struct dentry *upperdentry;
> + if (!rcu) {
> + struct inode *realinode = d_real_inode(dentry);
>
> - /*
> - * Nothing to do if in rcu or if non-overlayfs
> - */
> - if (rcu || likely(!(dentry->d_flags & DCACHE_OP_REAL)))
> - return;
> -
> - upperdentry = d_real(dentry, NULL, 0, D_REAL_UPPER);
> -
> - /*
> - * If file is on lower then we can't update atime, so no worries about
> - * stale mtime/ctime.
> - */
> - if (upperdentry) {
> - struct inode *realinode = d_inode(upperdentry);
> -
> - if ((!timespec_equal(&inode->i_mtime, &realinode->i_mtime) ||
> + if (unlikely(inode != realinode) &&
> + (!timespec_equal(&inode->i_mtime, &realinode->i_mtime) ||
> !timespec_equal(&inode->i_ctime, &realinode->i_ctime))) {
> inode->i_mtime = realinode->i_mtime;
> inode->i_ctime = realinode->i_ctime;
> diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
> index c3d8c7ea180f..006dc70d7425 100644
> --- a/fs/overlayfs/super.c
> +++ b/fs/overlayfs/super.c
> @@ -107,9 +107,6 @@ static struct dentry *ovl_d_real(struct dentry *dentry,
> if (inode && d_inode(dentry) == inode)
> return dentry;
>
> - if (flags & D_REAL_UPPER)
> - return ovl_dentry_upper(dentry);
> -
> if (!d_is_reg(dentry)) {
> if (!inode || inode == d_inode(dentry))
> return dentry;
> diff --git a/include/linux/dcache.h b/include/linux/dcache.h
> index 82a99d366aec..4c7ab11c627a 100644
> --- a/include/linux/dcache.h
> +++ b/include/linux/dcache.h
> @@ -565,9 +565,6 @@ static inline struct dentry *d_backing_dentry(struct dentry *upper)
> return upper;
> }
>
> -/* d_real() flags */
> -#define D_REAL_UPPER 0x2 /* return upper dentry or NULL if non-upper */
> -

Premature removal of constant. Still in use by may_write_real() at this point.

Thanks,
Amir.

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