[GFS2] Update debugging code
Update the debugging code in trans.c and at the same time improve
the debugging code for gfs2_holders. The new code should be pretty
fast during the normal case and provide just as much information
in case of errors (or more).
One small function from glock.c has moved to glock.h as a static inline so
that its return address won't get in the way of the debugging.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 81b0681..6a1b42c 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -16,6 +16,7 @@
#include <linux/sort.h>
#include <linux/jhash.h>
#include <linux/kref.h>
+#include <linux/kallsyms.h>
#include <linux/gfs2_ondisk.h>
#include <asm/semaphore.h>
#include <asm/uaccess.h>
@@ -357,6 +358,7 @@
{
INIT_LIST_HEAD(&gh->gh_list);
gh->gh_gl = gl;
+ gh->gh_ip = (unsigned long)__builtin_return_address(0);
gh->gh_owner = (flags & GL_NEVER_RECURSE) ? NULL : current;
gh->gh_state = state;
gh->gh_flags = flags;
@@ -388,6 +390,7 @@
gh->gh_flags |= GL_LOCAL_EXCL;
gh->gh_iflags &= 1 << HIF_ALLOCED;
+ gh->gh_ip = (unsigned long)__builtin_return_address(0);
}
/**
@@ -400,6 +403,7 @@
{
gfs2_glock_put(gh->gh_gl);
gh->gh_gl = NULL;
+ gh->gh_ip = 0;
}
/**
@@ -427,7 +431,7 @@
gfs2_holder_init(gl, state, flags, gh);
set_bit(HIF_ALLOCED, &gh->gh_iflags);
-
+ gh->gh_ip = (unsigned long)__builtin_return_address(0);
return gh;
}
@@ -1238,6 +1242,9 @@
return 0;
fail:
+ print_symbol(KERN_WARNING "GFS2: Existing holder from %s\n",
+ existing->gh_ip);
+ print_symbol(KERN_WARNING "GFS2: New holder from %s\n", new->gh_ip);
set_bit(HIF_ABORTED, &new->gh_iflags);
return -EINVAL;
}
@@ -1544,30 +1551,6 @@
}
/**
- * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock
- * @gl: the glock
- * @state: the state we're requesting
- * @flags: the modifier flags
- * @gh: the holder structure
- *
- * Returns: 0, GLR_*, or errno
- */
-
-int gfs2_glock_nq_init(struct gfs2_glock *gl, unsigned int state, int flags,
- struct gfs2_holder *gh)
-{
- int error;
-
- gfs2_holder_init(gl, state, flags, gh);
-
- error = gfs2_glock_nq(gh);
- if (error)
- gfs2_holder_uninit(gh);
-
- return error;
-}
-
-/**
* gfs2_glock_dq_uninit - dequeue a holder from a glock and initialize it
* @gh: the holder structure
*
@@ -2334,6 +2317,7 @@
if (test_bit(x, &gh->gh_iflags))
printk(" %u", x);
printk(" \n");
+ print_symbol(KERN_INFO " initialized at: %s\n", gh->gh_ip);
error = 0;
diff --git a/fs/gfs2/glock.h b/fs/gfs2/glock.h
index 06847eb..560029d 100644
--- a/fs/gfs2/glock.h
+++ b/fs/gfs2/glock.h
@@ -106,8 +106,6 @@
int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time);
-int gfs2_glock_nq_init(struct gfs2_glock *gl, unsigned int state, int flags,
- struct gfs2_holder *gh);
void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
int gfs2_glock_nq_num(struct gfs2_sbd *sdp,
uint64_t number, struct gfs2_glock_operations *glops,
@@ -121,6 +119,31 @@
struct gfs2_glock_operations *glops,
unsigned int state, int flags);
+/**
+ * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock
+ * @gl: the glock
+ * @state: the state we're requesting
+ * @flags: the modifier flags
+ * @gh: the holder structure
+ *
+ * Returns: 0, GLR_*, or errno
+ */
+
+static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,
+ unsigned int state, int flags,
+ struct gfs2_holder *gh)
+{
+ int error;
+
+ gfs2_holder_init(gl, state, flags, gh);
+
+ error = gfs2_glock_nq(gh);
+ if (error)
+ gfs2_holder_uninit(gh);
+
+ return error;
+}
+
/* Lock Value Block functions */
int gfs2_lvb_hold(struct gfs2_glock *gl);
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 35163b5..b5a994d 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -161,6 +161,7 @@
int gh_error;
unsigned long gh_iflags;
struct completion gh_wait;
+ unsigned long gh_ip;
};
enum {
@@ -353,8 +354,7 @@
};
struct gfs2_trans {
- char *tr_file;
- unsigned int tr_line;
+ unsigned long tr_ip;
unsigned int tr_blocks;
unsigned int tr_revokes;
diff --git a/fs/gfs2/trans.c b/fs/gfs2/trans.c
index aa1a619..3fae3d4 100644
--- a/fs/gfs2/trans.c
+++ b/fs/gfs2/trans.c
@@ -13,6 +13,7 @@
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/gfs2_ondisk.h>
+#include <linux/kallsyms.h>
#include <asm/semaphore.h>
#include "gfs2.h"
@@ -25,24 +26,20 @@
#include "trans.h"
#include "util.h"
-int gfs2_trans_begin_i(struct gfs2_sbd *sdp, unsigned int blocks,
- unsigned int revokes, char *file, unsigned int line)
+int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
+ unsigned int revokes)
{
struct gfs2_trans *tr;
int error;
- if (gfs2_assert_warn(sdp, !current->journal_info) ||
- gfs2_assert_warn(sdp, blocks || revokes)) {
- fs_warn(sdp, "(%s, %u)\n", file, line);
- return -EINVAL;
- }
+ BUG_ON(current->journal_info);
+ BUG_ON(blocks == 0 && revokes == 0);
tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
if (!tr)
return -ENOMEM;
- tr->tr_file = file;
- tr->tr_line = line;
+ tr->tr_ip = (unsigned long)__builtin_return_address(0);
tr->tr_blocks = blocks;
tr->tr_revokes = revokes;
tr->tr_reserved = 1;
@@ -104,16 +101,15 @@
return;
}
- if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks))
- fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u "
- "tr_file = %s, tr_line = %u\n",
- tr->tr_num_buf, tr->tr_blocks,
- tr->tr_file, tr->tr_line);
+ if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) {
+ fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u ",
+ tr->tr_num_buf, tr->tr_blocks);
+ print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
+ }
if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes))
- fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u "
- "tr_file = %s, tr_line = %u\n",
- tr->tr_num_revoke, tr->tr_revokes,
- tr->tr_file, tr->tr_line);
+ fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u ",
+ tr->tr_num_revoke, tr->tr_revokes);
+ print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
gfs2_log_commit(sdp, tr);
diff --git a/fs/gfs2/trans.h b/fs/gfs2/trans.h
index f7f3e2a..6b5e9e8 100644
--- a/fs/gfs2/trans.h
+++ b/fs/gfs2/trans.h
@@ -21,12 +21,8 @@
#define RES_STATFS 1
#define RES_QUOTA 2
-#define gfs2_trans_begin(sdp, blocks, revokes) \
-gfs2_trans_begin_i((sdp), (blocks), (revokes), __FILE__, __LINE__)
-
-int gfs2_trans_begin_i(struct gfs2_sbd *sdp,
- unsigned int blocks, unsigned int revokes,
- char *file, unsigned int line);
+int gfs2_trans_begin(struct gfs2_sbd *sdp,
+ unsigned int blocks, unsigned int revokes);
void gfs2_trans_end(struct gfs2_sbd *sdp);