linux-kernel - [PATCH 4.9 37/94] fs/ufs: Set UFS default maximum bytes per file

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Message-Id: <20170605153104.684650519@linuxfoundation.org>
Date:   Mon,  5 Jun 2017 18:17:13 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Richard Narron <comet.berkeley@...il.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Will B <will.brokenbourgh2877@...il.com>,
        Theodore Tso <tytso@....edu>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 4.9 37/94] fs/ufs: Set UFS default maximum bytes per file

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Richard Narron <comet.berkeley@...il.com>

commit 239e250e4acbc0104d514307029c0839e834a51a upstream.

This fixes a problem with reading files larger than 2GB from a UFS-2
file system:

    https://bugzilla.kernel.org/show_bug.cgi?id=195721

The incorrect UFS s_maxsize limit became a problem as of commit
c2a9737f45e2 ("vfs,mm: fix a dead loop in truncate_inode_pages_range()")
which started using s_maxbytes to avoid a page index overflow in
do_generic_file_read().

That caused files to be truncated on UFS-2 file systems because the
default maximum file size is 2GB (MAX_NON_LFS) and UFS didn't update it.

Here I simply increase the default to a common value used by other file
systems.

Signed-off-by: Richard Narron <comet.berkeley@...il.com>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Will B <will.brokenbourgh2877@...il.com>
Cc: Theodore Ts'o <tytso@....edu>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/ufs/super.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/fs/ufs/super.c
+++ b/fs/ufs/super.c
@@ -812,9 +812,8 @@ static int ufs_fill_super(struct super_b
 	uspi->s_dirblksize = UFS_SECTOR_SIZE;
 	super_block_offset=UFS_SBLOCK;
 
-	/* Keep 2Gig file limit. Some UFS variants need to override 
-	   this but as I don't know which I'll let those in the know loosen
-	   the rules */
+	sb->s_maxbytes = MAX_LFS_FILESIZE;
+
 	switch (sbi->s_mount_opt & UFS_MOUNT_UFSTYPE) {
 	case UFS_MOUNT_UFSTYPE_44BSD:
 		UFSD("ufstype=44bsd\n");