void-packages/srcpkgs/gpart/patches/0002-gpart-avoid-superfluous-seek-calls.patch
Nathan Owens 7dc6bce189 gpart: various improvements
Add patch to fix crash non-disk device
Add patch to avoid superfluous seek calls
Add patches to increase reading speed
Add patch for LVM2 and btrfs to list of supported modules

Signed-off-by: Nathan Owens <ndowens04@gmail.com>
2019-11-24 10:39:36 +01:00

113 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
--- src/gpart.c
+++ 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