ext4: ratelimit the file system mounted message

The xfstests ext4/305 will mount and unmount the same file system over
4,000 times, and each one of these will cause a system log message.
Ratelimit this message since if we are getting more than a few dozen
of these messages, they probably aren't going to be helpful.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 70c52ea0a27cacb149a37b46073b641801fb0b0c..45658c1bc324565fe35ec749414d24b4d5e401d2 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -60,6 +60,7 @@ static struct ext4_lazy_init *ext4_li_info;
 static struct mutex ext4_li_mtx;
 static struct ext4_features *ext4_feat;
 static int ext4_mballoc_ready;
+static struct ratelimit_state ext4_mount_msg_ratelimit;
 
 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
                             unsigned long journal_devnum);
@@ -4277,9 +4278,10 @@ no_journal:
                                 "the device does not support discard");
        }
 
-       ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
-                "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
-                *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
+       if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
+               ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
+                        "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
+                        *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
 
        if (es->s_error_count)
                mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
@@ -5617,6 +5619,7 @@ static int __init ext4_init_fs(void)
 {
        int i, err;
 
+       ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
        ext4_li_info = NULL;
        mutex_init(&ext4_li_mtx);