[GFS2] bz 236008: Kernel gpf doing cat /debugfs/gfs2/xxx (lock dump) [24/34]

Steven Whitehouse
2007-05-01T10:22:38Z

>From 7a0079d9e3fe8826475a08785f3d348c4b509774 Mon Sep 17 00:00:00 2001
From: Robert Peterson <rpeterso@redhat.com>
Date: Tue, 17 Apr 2007 11:37:11 -0500
Subject: [PATCH] [GFS2] bz 236008: Kernel gpf doing cat /debugfs/gfs2/xxx (lock dump)

This is for Bugzilla Bug 236008: Kernel gpf doing cat /debugfs/gfs2/xxx
(lock dump) seen at the "gfs2 summit". This also fixes the bug that caused
garbage to be printed by the "initialized at" field. I apologize for the
kludge, but that code will all be ripped out anyway when the official
sprint_symbol function becomes available in the Linux kernel. I also
changed some formatting so that spaces are replaced by proper tabs.

Signed-off-by: Robert Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index d2e3094..b075f93 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -1765,15 +1765,20 @@ static void gfs2_print_symbol(struct glock_iter *gi, const char *fmt,
{
/* when sprint_symbol becomes available in the new kernel, replace this */
/* function with:
- char buffer[KSYM_SYMBOL_LEN];
+ char buffer[KSYM_SYMBOL_LEN];

- sprint_symbol(buffer, address);
- print_dbg(gi, fmt, buffer);
+ sprint_symbol(buffer, address);
+ print_dbg(gi, fmt, buffer);
*/
- if (gi)
- print_dbg(gi, fmt, address);
- else
- print_symbol(fmt, address);
+ char buffer[256];
+
+ if (gi) {
+ memset(buffer, 0, sizeof(buffer));
+ sprintf(buffer, "%p", address);
+ print_dbg(gi, fmt, buffer);
+ }
+ else
+ print_symbol(fmt, address);
}

/**
@@ -1993,14 +1998,19 @@ int __init gfs2_glock_init(void)

static int gfs2_glock_iter_next(struct glock_iter *gi)
{
+ read_lock(gl_lock_addr(gi->hash));
while (1) {
if (!gi->hb_list) { /* If we don't have a hash bucket yet */
gi->hb_list = &gl_hash_table[gi->hash].hb_list;
if (hlist_empty(gi->hb_list)) {
+ read_unlock(gl_lock_addr(gi->hash));
gi->hash++;
+ read_lock(gl_lock_addr(gi->hash));
gi->hb_list = NULL;
- if (gi->hash >= GFS2_GL_HASH_SIZE)
+ if (gi->hash >= GFS2_GL_HASH_SIZE) {
+ read_unlock(gl_lock_addr(gi->hash));
return 1;
+ }
else
continue;
}
@@ -2011,7 +2021,9 @@ static int gfs2_glock_iter_next(struct glock_iter *gi)
}
} else {
if (gi->gl->gl_list.next == NULL) {
+ read_unlock(gl_lock_addr(gi->hash));
gi->hash++;
+ read_lock(gl_lock_addr(gi->hash));
gi->hb_list = NULL;
continue;
}
@@ -2021,6 +2033,7 @@ static int gfs2_glock_iter_next(struct glock_iter *gi)
if (gi->gl)
break;
}
+ read_unlock(gl_lock_addr(gi->hash));
return 0;
}

--
1.5.1.2