linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Jan Blunck <jblunck@suse.de>
To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Bharata B Rao <bharata@linux.vnet.ibm.com>
Subject: [RFC 09/26] linux/stat.h: Add the filetype white-out
Date: Mon, 30 Jul 2007 18:13:32 +0200	[thread overview]
Message-ID: <20070730161323.987896048@weierstrass.suse.de> (raw)
In-Reply-To: 20070730161323.100048969@weierstrass.suse.de

[-- Attachment #1: um/stat-add-S_IFWHT.diff --]
[-- Type: text/plain, Size: 945 bytes --]

A white-out stops the VFS from further lookups of the white-out's name and
returns -ENOENT. This is the same behaviour as if the filename isn't
found. This can be used in combination with union mounts to virtually
delete (white-out) files by creating a file of this file type.

Signed-off-by: Jan Blunck <jblunck@suse.de>
---
 include/linux/stat.h |    2 ++
 1 file changed, 2 insertions(+)

--- a/include/linux/stat.h
+++ b/include/linux/stat.h
@@ -10,6 +10,7 @@
 #if defined(__KERNEL__) || !defined(__GLIBC__) || (__GLIBC__ < 2)
 
 #define S_IFMT  00170000
+#define S_IFWHT  0160000	/* whiteout */
 #define S_IFSOCK 0140000
 #define S_IFLNK	 0120000
 #define S_IFREG  0100000
@@ -28,6 +29,7 @@
 #define S_ISBLK(m)	(((m) & S_IFMT) == S_IFBLK)
 #define S_ISFIFO(m)	(((m) & S_IFMT) == S_IFIFO)
 #define S_ISSOCK(m)	(((m) & S_IFMT) == S_IFSOCK)
+#define S_ISWHT(m)	(((m) & S_IFMT) == S_IFWHT)
 
 #define S_IRWXU 00700
 #define S_IRUSR 00400

-- 


  parent reply	other threads:[~2007-07-30 16:16 UTC|newest]

Thread overview: 65+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-07-30 16:13 [RFC 00/26] VFS based Union Mount (V2) Jan Blunck
2007-07-30 16:13 ` [RFC 01/26] [PATCH 14/18] shmem: convert to using splice instead of sendfile() Jan Blunck
2007-07-30 16:13 ` [RFC 02/26] VFS: Export dput_path() and path_to_nameidata() Jan Blunck
2007-07-30 16:13 ` [RFC 03/26] VFS: Make lookup_hash() return a struct path Jan Blunck
2007-07-30 16:13 ` [RFC 04/26] VFS: Make lookup_create() " Jan Blunck
2007-07-30 16:13 ` [RFC 05/26] VFS: cache_lookup() cleanup Jan Blunck
2007-07-30 16:13 ` [RFC 06/26] VFS: Make real_lookup() return a struct path Jan Blunck
2007-07-30 16:13 ` [RFC 07/26] VFS: Introduce dput() variante that maintains a kill-list Jan Blunck
2007-07-30 16:13 ` [RFC 08/26] VFS: Export lives_below_in_same_fs() Jan Blunck
2007-07-30 16:13 ` Jan Blunck [this message]
2007-07-30 16:13 ` [RFC 10/26] VFS white-out handling Jan Blunck
2007-07-30 16:13 ` [RFC 11/26] tmpfs white-out support Jan Blunck
2007-08-01 15:13   ` Hugh Dickins
2007-08-02  2:48     ` Matt Mackall
2007-07-30 16:13 ` [RFC 12/26] ext2 " Jan Blunck
2007-07-31  3:45   ` Theodore Tso
2007-07-31  7:44     ` Jan Blunck
2007-07-31  8:32       ` Andreas Dilger
2007-07-31  9:08         ` Jan Blunck
2007-07-31 10:53       ` Theodore Tso
2007-08-02 19:31         ` Pavel Machek
2007-07-31 16:36   ` Josef Sipek
2007-07-31 17:00     ` Jan Blunck
2007-07-31 17:11       ` Josef Sipek
2007-08-01 15:23         ` Dave Kleikamp
2007-08-01 18:44           ` Josef Sipek
2007-08-01 19:10             ` Dave Kleikamp
2007-08-01 19:33               ` Josef Sipek
2007-08-01 19:52                 ` Dave Kleikamp
2007-08-01 22:06                   ` Erez Zadok
2007-08-02 12:05                     ` Jan Blunck
2007-08-02 11:55                 ` Jan Blunck
2007-08-02 17:50                 ` Jörn Engel
2007-08-02 18:15                   ` Jeremy Maitin-Shepard
2007-08-02  5:24             ` Ph. Marek
2007-08-02 12:12               ` Jan Blunck
2007-08-02 10:26         ` Jan Blunck
2007-08-01 10:00       ` Hans-Peter Jansen
2007-08-01 11:43         ` Josef Sipek
2007-08-01 18:01         ` Jan Engelhardt
2007-07-31 17:03     ` Mark Williamson
2007-07-31 17:16       ` Josef Sipek
2007-08-01 17:58     ` Jan Engelhardt
2007-08-01 18:03       ` Josef Sipek
2007-07-30 16:13 ` [RFC 13/26] ext3 whiteout support Jan Blunck
2007-07-30 16:13 ` [RFC 14/26] union-mount: Documentation Jan Blunck
2007-07-30 16:13 ` [RFC 15/26] union-mount: Add union-mount mount flag Jan Blunck
2007-07-30 16:13 ` [RFC 16/26] union-mount: Introduce union_mount structure Jan Blunck
2007-08-06  5:57   ` Bharata B Rao
2007-07-30 16:13 ` [RFC 17/26] union-mount: Drive the union cache via dcache Jan Blunck
2007-07-30 16:13 ` [RFC 18/26] union-mount: Changes to the namespace handling Jan Blunck
2007-08-08 10:10   ` Bharata B Rao
2007-07-30 16:13 ` [RFC 19/26] union-mount: Make lookup work for union-mounted file systems Jan Blunck
2007-08-09  5:42   ` Bharata B Rao
2007-07-30 16:13 ` [RFC 20/26] union-mount: Simple union-mount readdir implementation Jan Blunck
2007-08-06 11:08   ` Bharata B Rao
2007-07-30 16:13 ` [RFC 21/26] union-mount: in-kernel file copy between union mounted filesystems Jan Blunck
2007-07-30 16:13 ` [RFC 22/26] union-mount: white-out changes for copy-on-open Jan Blunck
2007-07-30 16:13 ` [RFC 23/26] union-mount: copyup on rename Jan Blunck
2007-07-30 16:13 ` [RFC 24/26] union-mount: dont report EROFS for union mounts Jan Blunck
2007-07-30 16:13 ` [RFC 25/26] union-mount: Debug Infrastructure Jan Blunck
2007-07-30 16:13 ` [RFC 26/26] union-mount: Debug code Jan Blunck
2007-07-30 18:23 ` [RFC 00/26] VFS based Union Mount (V2) Al Boldi
2007-08-02  6:49 ` Bharata B Rao
2007-08-02 10:17   ` Jan Blunck

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20070730161323.987896048@weierstrass.suse.de \
    --to=jblunck@suse.de \
    --cc=bharata@linux.vnet.ibm.com \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).