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[Cluster-devel] [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: Bob Peterson (rpeterso redhat com)

fs/gfs2/glock.c |   29 +++++++++++++++++++++--------
1 files changed, 21 insertions(+), 8 deletions(-)

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;
}



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