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From: Al Viro <viro@zeniv.linux.org.uk>
To: Mike Kravetz <mike.kravetz@oracle.com>
Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
	overlayfs <linux-unionfs@vger.kernel.org>,
	linux-kernel@vger.kernel.org, Miklos Szeredi <miklos@szeredi.hu>,
	Matthew Wilcox <willy@infradead.org>,
	Colin Walters <walters@verbum.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	syzbot <syzbot+d6ec23007e951dadf3de@syzkaller.appspotmail.com>,
	syzkaller-bugs <syzkaller-bugs@googlegroups.com>
Subject: Re: [PATCH v4 1/2] hugetlb: use f_mode & FMODE_HUGETLBFS to identify hugetlbfs files
Date: Fri, 12 Jun 2020 02:58:42 +0100	[thread overview]
Message-ID: <20200612015842.GC23230@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20200612004644.255692-1-mike.kravetz@oracle.com>

On Thu, Jun 11, 2020 at 05:46:43PM -0700, Mike Kravetz wrote:
> The routine is_file_hugepages() checks f_op == hugetlbfs_file_operations
> to determine if the file resides in hugetlbfs.  This is problematic when
> the file is on a union or overlay.  Instead, define a new file mode
> FMODE_HUGETLBFS which is set when a hugetlbfs file is opened.  The mode
> can easily be copied to other 'files' derived from the original hugetlbfs
> file.
> 
> With this change hugetlbfs_file_operations can be static as it should be.
> 
> There is also a (duplicate) set of shm file operations used for the routine
> is_file_shm_hugepages().  Instead of setting/using special f_op's, just
> propagate the FMODE_HUGETLBFS mode.  This means is_file_shm_hugepages() and
> the duplicate f_ops can be removed.

s/HUGETLBFS/HUGEPAGES/, please.

> While cleaning things up, change the name of is_file_hugepages() to
> is_file_hugetlbfs().  The term hugepages is a bit ambiguous.

Don't, especially since the very next patch adds such on overlayfs...

Incidentally, can a hugetlbfs be a lower layer, while the upper one
is a normal filesystem?  What should happen on copyup?

  parent reply	other threads:[~2020-06-12  1:58 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-12  0:46 Mike Kravetz
2020-06-12  0:46 ` [PATCH v4 2/2] ovl: call underlying get_unmapped_area() routine. propogate FMODE_HUGETLBFS Mike Kravetz
2020-06-14 12:50   ` Amir Goldstein
2020-06-12  1:53 ` [PATCH v4 1/2] hugetlb: use f_mode & FMODE_HUGETLBFS to identify hugetlbfs files Matthew Wilcox
2020-06-12  1:58 ` Al Viro [this message]
2020-06-12 21:51   ` Mike Kravetz
2020-06-13  6:53     ` Amir Goldstein
2020-06-13 14:38       ` Matthew Wilcox
2020-06-13 19:12       ` Mike Kravetz
2020-06-15  7:53         ` Miklos Szeredi
2020-06-15 10:05           ` Amir Goldstein
2020-06-15 13:01             ` Miklos Szeredi
2020-06-15 23:45           ` Mike Kravetz
2020-06-16  9:01             ` Miklos Szeredi
2020-06-15  8:24       ` Miklos Szeredi
2020-06-15 17:48         ` Mike Kravetz
2020-06-12  6:28 ` [RFC PATCH] hugetlb: hugetlbfs_file_operations can be static kernel test robot

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