[PATCH] isofs: Fix lseek() to position beyond 4 GB
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From: Jan Andres on 3 Aug 2010 17:20 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(a)gmx.net> --- linux-2.6.35-j7/fs/isofs/inode.c.orig 2010-08-02 00:11:14.000000000 +0200 +++ linux-2.6.35-j7/fs/isofs/inode.c 2010-08-03 22:54:38.000000000 +0200 @@ -722,7 +722,12 @@ root_found: } 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 = 0x80000000000; /* * The CDROM is read-only, has no nodes (devices) on it, and since -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |