From: Al Viro <viro@zeniv.linux.org.uk>
To: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>,
kbuild test robot <lkp@intel.com>,
kbuild-all@lists.01.org, Colin Walters <walters@verbum.org>,
syzbot <syzbot+d6ec23007e951dadf3de@syzkaller.appspotmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linux Memory Management List <linux-mm@kvack.org>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
overlayfs <linux-unionfs@vger.kernel.org>
Subject: Re: [PATCH v2] ovl: provide real_file() and overlayfs get_unmapped_area()
Date: Thu, 11 Jun 2020 01:37:26 +0100 [thread overview]
Message-ID: <20200611003726.GY23230@ZenIV.linux.org.uk> (raw)
In-Reply-To: <ffc00a9e-5c2f-0c3e-aa1e-9836b98f7b54@oracle.com>
On Wed, Jun 10, 2020 at 05:13:52PM -0700, Mike Kravetz wrote:
> To address this issue,
> - Add a new file operation f_real while will return the underlying file.
> Only overlayfs provides a function for this operation.
> - Add a new routine real_file() which can be used by core code get an
> underlying file.
> - Update is_file_hugepages to get the real file.
Egads... So to find out whether it's a hugetlb you would
* check if a method is NULL
* if not, call it
* ... and check if the method table of the result is hugetlbfs one?
Here's a radical suggestion: FMODE_HUGEPAGES. Just have it set by
->open() and let is_file_hugepages() check it. In ->f_mode. And
make the bloody hugetlbfs_file_operations static, while we are at it.
WARNING: multiple messages have this Message-ID (diff)
From: Al Viro <viro@zeniv.linux.org.uk>
To: kbuild-all@lists.01.org
Subject: Re: [PATCH v2] ovl: provide real_file() and overlayfs get_unmapped_area()
Date: Thu, 11 Jun 2020 01:37:26 +0100 [thread overview]
Message-ID: <20200611003726.GY23230@ZenIV.linux.org.uk> (raw)
In-Reply-To: <ffc00a9e-5c2f-0c3e-aa1e-9836b98f7b54@oracle.com>
[-- Attachment #1: Type: text/plain, Size: 761 bytes --]
On Wed, Jun 10, 2020 at 05:13:52PM -0700, Mike Kravetz wrote:
> To address this issue,
> - Add a new file operation f_real while will return the underlying file.
> Only overlayfs provides a function for this operation.
> - Add a new routine real_file() which can be used by core code get an
> underlying file.
> - Update is_file_hugepages to get the real file.
Egads... So to find out whether it's a hugetlb you would
* check if a method is NULL
* if not, call it
* ... and check if the method table of the result is hugetlbfs one?
Here's a radical suggestion: FMODE_HUGEPAGES. Just have it set by
->open() and let is_file_hugepages() check it. In ->f_mode. And
make the bloody hugetlbfs_file_operations static, while we are at it.
next prev parent reply other threads:[~2020-06-11 0:37 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-06 3:06 kernel BUG at mm/hugetlb.c:LINE! syzbot
2020-04-06 22:05 ` Mike Kravetz
2020-05-12 15:04 ` Miklos Szeredi
2020-05-12 18:11 ` Mike Kravetz
2020-05-15 22:15 ` Mike Kravetz
2020-05-18 11:12 ` Miklos Szeredi
2020-05-18 23:22 ` Mike Kravetz
2020-05-18 23:41 ` Colin Walters
2020-05-19 0:35 ` Mike Kravetz
2020-05-20 11:20 ` Miklos Szeredi
2020-05-20 17:27 ` Mike Kravetz
2020-05-22 10:05 ` Miklos Szeredi
2020-05-28 0:01 ` Mike Kravetz
2020-05-28 8:37 ` [PATCH v2] ovl: provide real_file() and overlayfs get_unmapped_area() kbuild test robot
2020-05-28 8:37 ` kbuild test robot
2020-05-28 21:01 ` Mike Kravetz
2020-05-28 21:01 ` Mike Kravetz
2020-06-04 9:16 ` Miklos Szeredi
2020-06-04 9:16 ` Miklos Szeredi
2020-06-11 0:13 ` Mike Kravetz
2020-06-11 0:13 ` Mike Kravetz
2020-06-11 0:37 ` Al Viro [this message]
2020-06-11 0:37 ` Al Viro
2020-06-11 1:36 ` Matthew Wilcox
2020-06-11 1:36 ` Matthew Wilcox
2020-06-11 2:17 ` Al Viro
2020-06-11 2:17 ` Al Viro
2020-06-11 2:31 ` Mike Kravetz
2020-06-11 2:31 ` Mike Kravetz
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