Messages in this thread Patch in this message | | | Date | Wed, 4 Aug 2010 22:52:46 +0200 | From | Jan Andres <> | Subject | [PATCH v2] isofs: Fix lseek() to position beyond 4 GB |
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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>
--- 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 2010-08-04 22:49:02.000000000 +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 = 0x80000000000LL; /* * The CDROM is read-only, has no nodes (devices) on it, and since
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