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[PATCH 23/30] r/o bind mounts: write counts for truncate()

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From: Dave Hansen <haveblue@...>
To: <linux-kernel@...>
Cc: <hch@...>, <miklos@...>, <akpm@...>, Dave Hansen <haveblue@...>
Subject: [PATCH 23/30] r/o bind mounts: write counts for truncate()
Date: Friday, February 15, 2008 - 6:37 pm

Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
---

 linux-2.6.git-dave/fs/open.c |   14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff -puN fs/open.c~r-o-bind-mounts-elevate-writer-count-for-do_sys_truncate fs/open.c
--- linux-2.6.git/fs/open.c~r-o-bind-mounts-elevate-writer-count-for-do_sys_truncate	2008-02-15 13:25:55.000000000 -0800
+++ linux-2.6.git-dave/fs/open.c	2008-02-15 13:25:55.000000000 -0800
@@ -244,21 +244,21 @@ static long do_sys_truncate(const char _
 	if (!S_ISREG(inode->i_mode))
 		goto dput_and_out;
 
-	error = vfs_permission(&nd, MAY_WRITE);
+	error = mnt_want_write(nd.path.mnt);
 	if (error)
 		goto dput_and_out;
 
-	error = -EROFS;
-	if (IS_RDONLY(inode))
-		goto dput_and_out;
+	error = vfs_permission(&nd, MAY_WRITE);
+	if (error)
+		goto mnt_drop_write_and_out;
 
 	error = -EPERM;
 	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
-		goto dput_and_out;
+		goto mnt_drop_write_and_out;
 
 	error = get_write_access(inode);
 	if (error)
-		goto dput_and_out;
+		goto mnt_drop_write_and_out;
 
 	/*
 	 * Make sure that there are no leases.  get_write_access() protects
@@ -276,6 +276,8 @@ static long do_sys_truncate(const char _
 
 put_write_and_out:
 	put_write_access(inode);
+mnt_drop_write_and_out:
+	mnt_drop_write(nd.path.mnt);
 dput_and_out:
 	path_put(&nd.path);
 out:
_
--
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Messages in current thread:
[PATCH 00/30] Read-only bind mounts (-mm resend), Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH] r/o bind mounts: stub functions, Dave Hansen, (Fri Feb 15, 9:32 pm)
[PATCH 30/30] r/o bind mounts: debugging for missed calls, Dave Hansen, (Fri Feb 15, 6:38 pm)
[PATCH 29/30] r/o bind mounts: honor mount writer counts at ..., Dave Hansen, (Fri Feb 15, 6:38 pm)
[PATCH 28/30] r/o bind mounts: track numbers of writers to m..., Dave Hansen, (Fri Feb 15, 6:37 pm)
Re: [PATCH 28/30] r/o bind mounts: track numbers of writers ..., Miklos Szeredi, (Mon Feb 18, 12:10 pm)
Re: [PATCH 28/30] r/o bind mounts: track numbers of writers ..., Dave Hansen, (Wed Feb 20, 5:12 pm)
[PATCH 27/30] r/o bind mounts: get callers of vfs_mknod/crea..., Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 26/30] r/o bind mounts: check mnt instead of superblo..., Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 22/30] r/o bind mounts: elevate write count for chmod..., Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 25/30] r/o bind mounts: make access() use new r/o hel..., Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 24/30] r/o bind mounts: elevate count for xfs timesta..., Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 23/30] r/o bind mounts: write counts for truncate(), Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 21/30] r/o bind mounts: get write access for vfs_rena..., Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 20/30] r/o bind mounts: elevate write count for open()s, Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 19/30] r/o bind mounts: elevate write count for ioctl..., Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 18/30] r/o bind mounts: write counts for link/symlink, Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 17/30] r/o bind mounts: write count for file_update_t..., Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 06/30] merge open_namei() and do_filp_open(), Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 16/30] r/o bind mounts: elevate write count for do_ut..., Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 15/30] r/o bind mounts: write counts for time functions, Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 14/30] r/o bind mounts: elevate write count for ncp_i..., Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 13/30] r/o bind mounts: elevate write count for xattr..., Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 12/30] r/o bind mounts: elevate mnt_writers for unlin..., Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 11/30] r/o bind mounts: elevate write count for calle..., Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 10/30] r/o bind mounts: elevate write count for vfs_r..., Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 08/30] r/o bind mounts: create helper to drop file wr..., Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 05/30] do namei_flags calculation inside open_namei(), Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 03/30] check for null vfsmount in dentry_open(), Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 07/30] r/o bind mounts: stub functions, Dave Hansen, (Fri Feb 15, 6:37 pm)
Re: [PATCH 07/30] r/o bind mounts: stub functions, Theodore Tso, (Fri Feb 15, 8:32 pm)
Re: [PATCH 07/30] r/o bind mounts: stub functions, Dave Hansen, (Fri Feb 15, 8:49 pm)
Re: [PATCH 07/30] r/o bind mounts: stub functions, Theodore Tso, (Fri Feb 15, 9:00 pm)
Re: [PATCH 07/30] r/o bind mounts: stub functions, Andrew Morton, (Fri Feb 15, 9:11 pm)
Re: [PATCH 07/30] r/o bind mounts: stub functions, Christoph Hellwig, (Sat Feb 16, 2:31 am)
Re: [PATCH 07/30] r/o bind mounts: stub functions, Dave Hansen, (Wed Feb 20, 6:25 pm)
Re: [PATCH 07/30] r/o bind mounts: stub functions, Christoph Hellwig, (Wed Feb 20, 6:58 pm)
Re: [PATCH 07/30] r/o bind mounts: stub functions, Andrew Morton, (Sat Feb 16, 2:46 am)
Re: [PATCH 07/30] r/o bind mounts: stub functions, Dave Hansen, (Mon Feb 18, 3:06 am)
[PATCH 09/30] r/o bind mounts: drop write during emergency r..., Dave Hansen, (Fri Feb 15, 6:37 pm)
Re: [PATCH 09/30] r/o bind mounts: drop write during emergen..., Miklos Szeredi, (Mon Feb 18, 12:29 pm)
Re: [PATCH 09/30] r/o bind mounts: drop write during emergen..., Al Viro, (Sat Feb 23, 9:38 am)
[PATCH 01/30] reiserfs: eliminate private use of struct file..., Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 04/30] fix up new filp allocators, Dave Hansen, (Fri Feb 15, 6:37 pm)
[PATCH 02/30] hppfs pass vfsmount to dentry_open(), Dave Hansen, (Fri Feb 15, 6:37 pm)