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osst: use noop_llseek() instead of default_llseek()

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__os_scsi_tape_open() suggests that llseek() doesn't work: "We really want
to do nonseekable_open(inode, filp); here, but some versions of tar
incorrectly call lseek on tapes and bail out if that fails.  So we
disallow pread() and pwrite(), but permit lseeks."

Instead of using the fallback default_llseek() the driver should use
noop_llseek() which leaves the file->f_pos untouched but succeeds.

Signed-off-by: Jan Blunck <jblunck@suse.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Willem Riede <osst@riede.org>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jan Blunck 2010-05-26 14:44:50 -07:00 committed by Linus Torvalds
parent ae6afc3f5c
commit 889e5fbbc2
1 changed files with 1 additions and 0 deletions
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drivers/scsi/osst.c
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@ -5626,6 +5626,7 @@ static const struct file_operations osst_fops = {
.open = os_scsi_tape_open,
.flush = os_scsi_tape_flush,
.release = os_scsi_tape_close,
.llseek = noop_llseek,
};
static int osst_supports(struct scsi_device * SDp)