Date: Wed, 29 Jul 1998 18:49:38 -0700 (PDT) From: Andrew Heybey <ath@niksun.com> To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: kern/7441: src/sys/scsi/st.c:st_close() ignores errors from st_write_filemarks() Message-ID: <199807300149.SAA01417@gamma.it.kth.se>
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>Number: 7441
>Category: kern
>Synopsis: src/sys/scsi/st.c:st_close() ignores errors from st_write_filemarks()
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Jul 29 18:50:02 PDT 1998
>Last-Modified:
>Originator: Andrew Heybey
>Organization:
>Release: FreeBSD 2.2.6-RELEASE i386
>Environment:
Writing to a SCSI tape near EOM.
>Description:
In sys/scsi/st.c, st_close() does not check for errors from calling
st_write_filemarks(). This means that it is possible to write a file
on the tape for which all the writes and the close return without
errors, but the all bits did not make it onto the tape.
>How-To-Repeat:
Write to a SCSI tape near EOM and get unlucky such that no
error is returned until the file marks are written in st_close().
>Fix:
*** st.c 1998/07/29 15:35:05 1.1
--- st.c 1998/07/29 15:39:53
***************
*** 452,464 ****
{
u_int32_t unit, mode;
struct scsi_data *st;
unit = STUNIT(dev);
mode = MODE(dev);
st = sc_link->sd;
if ((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN)
! st_write_filemarks(unit, 1, 0);
/*
* Since the device has seen its last close, allow media removal.
--- 452,465 ----
{
u_int32_t unit, mode;
struct scsi_data *st;
+ errval errcode = 0;
unit = STUNIT(dev);
mode = MODE(dev);
st = sc_link->sd;
if ((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN)
! errcode = st_write_filemarks(unit, 1, 0);
/*
* Since the device has seen its last close, allow media removal.
***************
*** 484,490 ****
sc_link->flags &= ~SDEV_OPEN;
st->flags &= ~ST_OPEN;
! return (0);
}
/*
--- 485,491 ----
sc_link->flags &= ~SDEV_OPEN;
st->flags &= ~ST_OPEN;
! return (errcode);
}
/*
>Audit-Trail:
>Unformatted:
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