linux-kernel - [PATCH 1/4] vfs: make get_sb_pseudo set s_maxbytes to value that can be cast to signed

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Message-Id: <1249671461-9071-2-git-send-email-jlayton@redhat.com>
Date:	Fri,  7 Aug 2009 14:57:38 -0400
From:	Jeff Layton <jlayton@...hat.com>
To:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, hch@...radead.org, rlove@...gle.com,
	msb@...gle.com, viro@...iv.linux.org.uk, hannes@...xchg.org
Subject: [PATCH 1/4] vfs: make get_sb_pseudo set s_maxbytes to value that can be cast to signed

This patch is a counterpart to the CIFS patch posted yesterday. I
believe either patch will fix the problem seen in do_sendfile since the
smaller s_maxbytes value for the two superblocks is used there.

get_sb_pseudo sets s_maxbytes to ~0ULL, which becomes negative when cast
to a signed value. Fix it to use MAX_LFS_FILESIZE which casts properly
to a positive signed value.

Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
 fs/libfs.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/libfs.c b/fs/libfs.c
index ddfa899..dcec3d3 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -217,7 +217,7 @@ int get_sb_pseudo(struct file_system_type *fs_type, char *name,
 		return PTR_ERR(s);
 
 	s->s_flags = MS_NOUSER;
-	s->s_maxbytes = ~0ULL;
+	s->s_maxbytes = MAX_LFS_FILESIZE;
 	s->s_blocksize = PAGE_SIZE;
 	s->s_blocksize_bits = PAGE_SHIFT;
 	s->s_magic = magic;
-- 
1.6.0.6

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