114 lines
3.4 KiB
Diff
114 lines
3.4 KiB
Diff
From bba08ed9c64e8e8dad239b19e6ca8128adcaac64 Mon Sep 17 00:00:00 2001
|
|
From: Martin Wilck <mwilck@arcor.de>
|
|
Date: Fri, 20 Nov 2015 00:17:13 +0100
|
|
Subject: [PATCH 2/5] gpart: avoid superfluous seek calls
|
|
|
|
The l64opush() logic would cause 2 lseek() syscalls per guess loop.
|
|
By simply seeking back after every probing call, we do with a single
|
|
seek() call.
|
|
---
|
|
src/gpart.c | 42 ++++++++++++++++++++++--------------------
|
|
1 file changed, 22 insertions(+), 20 deletions(-)
|
|
|
|
diff --git src/gpart.c src/gpart.c
|
|
index 8555f66..bd3806a 100644
|
|
--- a/src/gpart.c
|
|
+++ b/src/gpart.c
|
|
@@ -13,7 +13,7 @@
|
|
* Modified: 11.06.1999 <mb@ichabod.han.de>
|
|
* Handle disk read errors.
|
|
* Minor fixes.
|
|
- *
|
|
+ *
|
|
* 29.06.1999 <mb@ichabod.han.de>
|
|
* Made every disk read/write buffer aligned to pagesize.
|
|
*
|
|
@@ -21,7 +21,7 @@
|
|
* Default scan increment now 's'.
|
|
* Extended ptbl boundary condition now depends on scan
|
|
* increment.
|
|
- *
|
|
+ *
|
|
* 26.02.2000 <mb@ichabod.han.de>
|
|
* Default scan increment 'h' again.
|
|
* Fixed faulty head boundary condition.
|
|
@@ -871,7 +871,7 @@ static void add_guessed_p(disk_desc *d,dos_part_entry *p,int cnt)
|
|
gpt = d->d_gl = (dos_guessed_pt *)alloc(sizeof(dos_guessed_pt));
|
|
else
|
|
{
|
|
- for (gpt = d->d_gl; gpt->g_next; gpt = gpt->g_next)
|
|
+ for (gpt = d->d_gl; gpt->g_next; gpt = gpt->g_next)
|
|
;
|
|
gpt->g_next = (dos_guessed_pt *)alloc(sizeof(dos_guessed_pt));
|
|
gpt = gpt->g_next;
|
|
@@ -999,15 +999,18 @@ static void do_guess_loop(disk_desc *d)
|
|
pr(MSG,DM_STARTSCAN);
|
|
|
|
scanloop:
|
|
- while ((rd = bread(d->d_fd,d->d_sbuf,d->d_ssize,nsecs)) == bsize)
|
|
- {
|
|
- int mod, have_ext = 0;
|
|
- g_module *bg;
|
|
- s64_t sz, ofs;
|
|
-
|
|
- d->d_nsb += incr; noffset = 0;
|
|
- ofs = d->d_nsb; s2mb(d,ofs);
|
|
- if (maxsec && (d->d_nsb > maxsec)) break;
|
|
+ while ((rd = bread(d->d_fd, d->d_sbuf, d->d_ssize, nsecs)) == bsize) {
|
|
+ int mod, have_ext = 0;
|
|
+ g_module *bg;
|
|
+ s64_t sz, ofs, fpos;
|
|
+
|
|
+ d->d_nsb += incr;
|
|
+ noffset = 0;
|
|
+ ofs = d->d_nsb;
|
|
+ s2mb(d, ofs);
|
|
+ fpos = d->d_nsb * d->d_ssize + bsize;
|
|
+ if (maxsec && (d->d_nsb > maxsec))
|
|
+ break;
|
|
|
|
/*
|
|
* reset modules
|
|
@@ -1026,15 +1029,14 @@ guessit:
|
|
/*
|
|
* because a gmodule is allowed to seek on
|
|
* d->d_fd the current file position must be
|
|
- * saved.
|
|
+ * restored after calling it.
|
|
*/
|
|
|
|
- memset(&m->m_part,0,sizeof(dos_part_entry));
|
|
- m->m_guess = GM_NO; l64opush(d->d_fd);
|
|
- if ((*m->m_gfun)(d,m) && (m->m_guess * m->m_weight >= GM_PERHAPS))
|
|
+ memset(&m->m_part, 0, sizeof(dos_part_entry));
|
|
+ m->m_guess = GM_NO;
|
|
+ if ((*m->m_gfun)(d, m) && (m->m_guess * m->m_weight >= GM_PERHAPS))
|
|
guesses[mod++] = m;
|
|
- if ((sz = l64opop(d->d_fd)) != l64tell(d->d_fd))
|
|
- l64seek(d->d_fd,sz,SEEK_SET);
|
|
+ l64seek(d->d_fd, fpos, SEEK_SET);
|
|
}
|
|
|
|
/*
|
|
@@ -1288,7 +1290,7 @@ static void write_primary_ptbl(disk_desc *d,char *dev)
|
|
{
|
|
if ((n = number_or_quit(DM_ACTWHICHPART,1,NDOSPARTS)) < 0)
|
|
break;
|
|
- if ((n >= 1) && (n <= NDOSPARTS) &&
|
|
+ if ((n >= 1) && (n <= NDOSPARTS) &&
|
|
get_part_type(d->d_gpt.t_parts[n].p_typ))
|
|
{
|
|
d->d_gpt.t_parts[n - 1].p_flag = DOSPARTACTIVE;
|
|
@@ -1571,7 +1573,7 @@ static int check_partition_list(disk_desc *d)
|
|
if (gp->g_orph) pr(MSG,PM_G_ORPHANED);
|
|
if (gp->g_prim) pr(MSG,PM_G_PRIMARY);
|
|
if (gp->g_log) pr(MSG,PM_G_LOGICAL);
|
|
- pr(MSG,"\n");
|
|
+ pr(MSG,"\n");
|
|
if (f_verbose > 1)
|
|
print_partition(d,p,gp->g_log ? 1 : 0,0);
|
|
}
|
|
--
|
|
2.24.0
|
|
|