- Add information about the buf lock to db_show_buffer.

 - Add a 'show lockedbufs' command that is similar to show lockedvnods.

Sponsored by:	Isilon Systems, Inc.

1 files changed, 18 insertions, 0 deletions

diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c
index 6e0d913..a530d93 100644
--- a/sys/kern/vfs_bio.c
+++ b/sys/kern/vfs_bio.c
@@ -3790,12 +3790,16 @@ DB_SHOW_COMMAND(buffer, db_show_buffer)
 		return;
 	}
 
+	db_printf("buf at %p\n", bp);
 	db_printf("b_flags = 0x%b\n", (u_int)bp->b_flags, PRINT_BUF_FLAGS);
 	db_printf(
 	    "b_error = %d, b_bufsize = %ld, b_bcount = %ld, b_resid = %ld\n"
 	    "b_bufobj = (%p), b_data = %p, b_blkno = %jd\n",
 	    bp->b_error, bp->b_bufsize, bp->b_bcount, bp->b_resid,
 	    bp->b_bufobj, bp->b_data, (intmax_t)bp->b_blkno);
+	db_printf("lockstatus = %d, excl count = %d, excl owner %p\n",
+	    lockstatus(&bp->b_lock, NULL), bp->b_lock.lk_exclusivecount,
+	    bp->b_lock.lk_lockholder);
 	if (bp->b_npages) {
 		int i;
 		db_printf("b_npages = %d, pages(OBJ, IDX, PA): ", bp->b_npages);
@@ -3810,4 +3814,18 @@ DB_SHOW_COMMAND(buffer, db_show_buffer)
 		db_printf("\n");
 	}
 }
+
+DB_SHOW_COMMAND(lockedbufs, lockedbufs)
+{
+	struct buf *bp;
+	int i;
+
+	for (i = 0; i < nbuf; i++) {
+		bp = &buf[i];
+		if (lockcount(&bp->b_lock)) {
+			db_show_buffer((uintptr_t)bp, 1, 0, NULL);
+			db_printf("\n");
+		}
+	}
+}
 #endif /* DDB */