Re: [GIT PULL] Transition vfs to 64-bit timestamps

[Deepa Dinamani <deepa.kernel@gmail.com>]

There will be more conflicts if the lustre deletion patch gets into linux-next.

Regenerating the pull request close to when someone is ready to take
it would be the best scenario.
Are there any other suggestions as to how to merge a flag day patch like this?

Thanks,
-Deepa

On Wed, May 30, 2018 at 8:16 AM, Arnd Bergmann <arnd@arndb.de> wrote:
> On Sat, May 26, 2018 at 1:35 AM, Deepa Dinamani <deepa.kernel@gmail.com> wrote:
>
>> The flag patch applies cleanly. I've not seen the timestamps
>> update logic change often. The series applies cleanly on 4.17-rc6
>> and linux-next tip (top commit: next-20180517).
>
> It just stopped applying cleanly against the latest linux-next tree, due to
> a conflict against two patches from the overlayfs-next tree:
>
> b2a285e1dc5d ("Revert "vfs: update ovl inode before relatime check"")
> 681b186a012d ("Revert "ovl: fix relatime for directories"")
>
> After the conflict resolution below, it works fine again. Not sure what the
> best merge strategy would be, at least the bit in ovl_file_accessed()
> isn't obvious enough.
>
>        Arnd
>
> diff --cc fs/inode.c
> index 6404639e2491,9fe1f941be02..195b974e7a77
> --- a/fs/inode.c
> +++ b/fs/inode.c
> @@@ -1635,10 -1681,11 +1635,10 @@@ static int update_time(struct inode *in
>    *    This function automatically handles read only file systems and media,
>    *    as well as the "noatime" flag and inode specific "noatime" markers.
>    */
>  -bool __atime_needs_update(const struct path *path, struct inode *inode,
>  -                        bool rcu)
>  +bool atime_needs_update(const struct path *path, struct inode *inode)
>   {
>         struct vfsmount *mnt = path->mnt;
> -       struct timespec now;
> +       struct timespec64 now;
>
>         if (inode->i_flags & S_NOATIME)
>                 return false;
> @@@ -1661,10 -1708,10 +1661,14 @@@
>
>         now = current_time(inode);
>
>  -      if (!relatime_need_update(mnt, inode, now))
> -       if (!relatime_need_update(path, inode,
> timespec64_to_timespec(now), rcu))
> ++      if (!relatime_need_update(mnt, inode, timespec64_to_timespec(now)))
>                 return false;
>
> -       if (timespec_equal(&inode->i_atime, &now))
> +       if (timespec64_equal(&inode->i_atime, &now))
>                 return false;
>
>         return true;
> @@@ -1674,9 -1721,9 +1678,9 @@@ void touch_atime(const struct path *pat
>   {
>         struct vfsmount *mnt = path->mnt;
>         struct inode *inode = d_inode(path->dentry);
> -       struct timespec now;
> +       struct timespec64 now;
>
>  -      if (!__atime_needs_update(path, inode, false))
>  +      if (!atime_needs_update(path, inode))
>                 return;
>
>         if (!sb_start_write_trylock(inode->i_sb))
> diff --cc fs/overlayfs/inode.c
> index e31d64206a01,d7cca60f28e6..e0bb217c01e2
> --- a/fs/overlayfs/inode.c
> +++ b/fs/overlayfs/inode.c
> @@ -169,8 +169,8 @@ static void ovl_file_accessed(struct file *file)
>         if (!upperinode)
>                 return;
>
>  -       if ((!timespec_equal(&inode->i_mtime, &upperinode->i_mtime) ||
>  -            !timespec_equal(&inode->i_ctime, &upperinode->i_ctime))) {
>  +       if ((!timespec64_equal(&inode->i_mtime, &upperinode->i_mtime) ||
>  +            !timespec64_equal(&inode->i_ctime, &upperinode->i_ctime))) {
>                 inode->i_mtime = upperinode->i_mtime;
>                 inode->i_ctime = upperinode->i_ctime;
>         }
> @@@ -439,7 -384,39 +439,7 @@@ struct posix_acl *ovl_get_acl(struct in
>         return acl;
>   }
>
> - int ovl_update_time(struct inode *inode, struct timespec *ts, int flags)
>  -static bool ovl_open_need_copy_up(struct dentry *dentry, int flags)
>  -{
>  -      /* Copy up of disconnected dentry does not set upper alias */
>  -      if (ovl_dentry_upper(dentry) &&
>  -          (ovl_dentry_has_upper_alias(dentry) ||
>  -           (dentry->d_flags & DCACHE_DISCONNECTED)))
>  -              return false;
>  -
>  -      if (special_file(d_inode(dentry)->i_mode))
>  -              return false;
>  -
>  -      if (!(OPEN_FMODE(flags) & FMODE_WRITE) && !(flags & O_TRUNC))
>  -              return false;
>  -
>  -      return true;
>  -}
>  -
>  -int ovl_open_maybe_copy_up(struct dentry *dentry, unsigned int file_flags)
>  -{
>  -      int err = 0;
>  -
>  -      if (ovl_open_need_copy_up(dentry, file_flags)) {
>  -              err = ovl_want_write(dentry);
>  -              if (!err) {
>  -                      err = ovl_copy_up_flags(dentry, file_flags);
>  -                      ovl_drop_write(dentry);
>  -              }
>  -      }
>  -
>  -      return err;
>  -}
>  -
> + int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags)
>   {
>         if (flags & S_ATIME) {
>                 struct ovl_fs *ofs = inode->i_sb->s_fs_info;
> diff --cc fs/overlayfs/overlayfs.h
> index 93c84929d422,9fe10247f9d4..8477d9e4b4fe
> --- a/fs/overlayfs/overlayfs.h
> +++ b/fs/overlayfs/overlayfs.h
> @@@ -356,18 -330,10 +356,18 @@@ int ovl_xattr_get(struct dentry *dentry
>                   void *value, size_t size);
>   ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size);
>   struct posix_acl *ovl_get_acl(struct inode *inode, int type);
> - int ovl_update_time(struct inode *inode, struct timespec *ts, int flags);
>  -int ovl_open_maybe_copy_up(struct dentry *dentry, unsigned int file_flags);
> + int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags);
>   bool ovl_is_private_xattr(const char *name);