Date: Mon, 26 Aug 2013 21:15:50 +0000 (UTC) From: Joerg Wunsch <joerg@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r254937 - head/sys/dev/fdc Message-ID: <201308262115.r7QLFoUd033248@svn.freebsd.org>
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Author: joerg Date: Mon Aug 26 21:15:50 2013 New Revision: 254937 URL: http://svnweb.freebsd.org/changeset/base/254937 Log: Reimplement the FDOPT_NOERROR feature that was kicked out in r134081. It is needed for fdread(1) in order to be able to recover from CRC errors in the data field of a floppy sector (by returning the sector data that failed CRC, rather than inventing dummy data). When closing the device, clear all transient device options. MFC after: 1 week Modified: head/sys/dev/fdc/fdc.c Modified: head/sys/dev/fdc/fdc.c ============================================================================== --- head/sys/dev/fdc/fdc.c Mon Aug 26 20:39:02 2013 (r254936) +++ head/sys/dev/fdc/fdc.c Mon Aug 26 21:15:50 2013 (r254937) @@ -761,10 +761,13 @@ fdc_worker(struct fdc_data *fdc) int i, nsect; int st0, st3, cyl, mfm, steptrac, cylinder, descyl, sec; int head; + int override_error; static int need_recal; struct fdc_readid *idp; struct fd_formb *finfo; + override_error = 0; + /* Have we exhausted our retries ? */ bp = fdc->bp; fd = fdc->fd; @@ -1090,7 +1093,10 @@ fdc_worker(struct fdc_data *fdc) fdc->status[3], fdc->status[4], fdc->status[5]); } retry_line = __LINE__; - return (1); + if (fd->options & FDOPT_NOERROR) + override_error = 1; + else + return (1); } /* All OK */ switch(bp->bio_cmd) { @@ -1111,10 +1117,16 @@ fdc_worker(struct fdc_data *fdc) bp->bio_resid -= fd->fd_iosize; bp->bio_completed += fd->fd_iosize; fd->fd_ioptr += fd->fd_iosize; - /* Since we managed to get something done, reset the retry */ - fdc->retry = 0; - if (bp->bio_resid > 0) - return (0); + if (override_error) { + if ((debugflags & 4)) + printf("FDOPT_NOERROR: returning bad data\n"); + } else { + /* Since we managed to get something done, + * reset the retry */ + fdc->retry = 0; + if (bp->bio_resid > 0) + return (0); + } break; case BIO_FMT: break; @@ -1406,6 +1418,7 @@ fd_access(struct g_provider *pp, int r, ae = e + pp->ace; if (ar == 0 && aw == 0 && ae == 0) { + fd->options &= ~(FDOPT_NORETRY | FDOPT_NOERRLOG | FDOPT_NOERROR); device_unbusy(fd->dev); return (0); }
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