isofs: Fix lseek() to position beyond 4 GB
isofs supports files larger than 4 GB by using multi-extent files.
However an lseek() to a position beyond 4 GB in such a file will
fail with EINVAL, because s_maxbytes in the isofs superblock is
initialized to 2^32-1, and generic_file_llseek() checks against
that value.
I therefore suggest increasing the value of s_maxbytes to have
full support for large files in isofs. With multi-extent files, file
size is only limited by the maximum size of the file system (8 TB),
so this seems a reasonable value for s_maxbytes.
Signed-off-by: Jan Andres <jandres@gmx.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index 6b4dcd4..5a44811 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -722,7 +722,12 @@
}
s->s_magic = ISOFS_SUPER_MAGIC;
- s->s_maxbytes = 0xffffffff; /* We can handle files up to 4 GB */
+
+ /*
+ * With multi-extent files, file size is only limited by the maximum
+ * size of a file system, which is 8 TB.
+ */
+ s->s_maxbytes = 0x80000000000LL;
/*
* The CDROM is read-only, has no nodes (devices) on it, and since
