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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>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Jan Andres 2010-08-04 22:52:46 +02:00 committed by Al Viro
parent 532490f0a5
commit 66a362a2aa
1 changed files with 6 additions and 1 deletions
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7
fs/isofs/inode.c
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@ -722,7 +722,12 @@ static int isofs_fill_super(struct super_block *s, void *data, int silent)
}
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