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Use lseek(2) on devices if not tape drives.

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This makes listing on raw disk device much faster.
Reviewed and discussed in tech-kern and tech-userlevel lists.
This commit is contained in:
itohy 2000-02-17 03:08:40 +00:00
parent ba0ae447ef
commit fae63d9627
1 changed files with 11 additions and 8 deletions
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19
bin/pax/ar_io.c
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@ -1,4 +1,4 @@
/* $NetBSD: ar_io.c,v 1.15 2000/02/17 03:06:12 itohy Exp $ */
/* $NetBSD: ar_io.c,v 1.16 2000/02/17 03:08:40 itohy Exp $ */
/*-
* Copyright (c) 1992 Keith Muller.
@ -42,7 +42,7 @@
#if 0
static char sccsid[] = "@(#)ar_io.c 8.2 (Berkeley) 4/18/94";
#else
__RCSID("$NetBSD: ar_io.c,v 1.15 2000/02/17 03:06:12 itohy Exp $");
__RCSID("$NetBSD: ar_io.c,v 1.16 2000/02/17 03:08:40 itohy Exp $");
#endif
#endif /* not lint */
@ -991,7 +991,7 @@ ar_fow(sksz, skipped)
* number of physical blocks to skip (we do not know physical block
* size at this point), so we must only read foward on tapes!
*/
if (artyp != ISREG)
if (artyp == ISTAPE || artyp == ISPIPE)
return(0);
/*
@ -1004,13 +1004,16 @@ ar_fow(sksz, skipped)
* deal with the end of file (it will go to next volume by
* itself)
*/
if ((mpos = cpos + sksz) > arsb.st_size) {
*skipped = arsb.st_size - cpos;
mpos = cpos + sksz;
if (artyp == ISREG && mpos > arsb.st_size)
mpos = arsb.st_size;
} else
*skipped = sksz;
if (lseek(arfd, mpos, SEEK_SET) >= 0)
if ((mpos = lseek(arfd, mpos, SEEK_SET)) >= 0) {
*skipped = mpos - cpos;
return(0);
}
} else {
if (artyp != ISREG)
return(0); /* non-seekable device */
}
syswarn(1, errno, "Foward positioning operation on archive failed");
lstrval = -1;