fs/ufs: Set UFS default maximum bytes per file

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@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Will B <will.brokenbourgh2877@gmail.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: <stable@vger.kernel.org> # v4.9 and backports of c2a9737f45e2
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 3 deletions

diff --git a/fs/ufs/super.c b/fs/ufs/super.c
index 131b2b77c818..29ecaf739449 100644
--- a/fs/ufs/super.c
+++ b/fs/ufs/super.c
@@ -812,9 +812,8 @@ static int ufs_fill_super(struct super_block *sb, void *data, int silent)
         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");