[RFC][PATCH 13/20] elevate writer count for do_sys_truncate()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




Signed-off-by: Dave Hansen <[email protected]>
---

 lxc-dave/fs/open.c |   16 +++++++++++-----
 1 files changed, 11 insertions(+), 5 deletions(-)

diff -puN fs/open.c~C-elevate-writers-opens-part2-do_sys_truncate fs/open.c
--- lxc/fs/open.c~C-elevate-writers-opens-part2-do_sys_truncate	2006-06-16 15:58:07.000000000 -0700
+++ lxc-dave/fs/open.c	2006-06-16 15:58:07.000000000 -0700
@@ -244,28 +244,32 @@ 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.mnt);
 	if (error)
 		goto dput_and_out;
 
+	error = vfs_permission(&nd, MAY_WRITE);
+	if (error)
+		goto mnt_drop_write_and_out;
+
 	error = -EROFS;
 	if (IS_RDONLY(inode))
-		goto dput_and_out;
+		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;
 
 	/*
 	 * Make sure that there are no leases.
 	 */
 	error = break_lease(inode, FMODE_WRITE);
 	if (error)
-		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;
 
 	error = locks_verify_truncate(inode, NULL, length);
 	if (!error) {
@@ -274,6 +278,8 @@ static long do_sys_truncate(const char _
 	}
 	put_write_access(inode);
 
+mnt_drop_write_and_out:
+	mnt_drop_write(nd.mnt);
 dput_and_out:
 	path_release(&nd);
 out:
_
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux