exofs: Prints on mount and unmout

It is important to print in the logs when a filesystem was
mounted and eventually unmounted.

Print the osd-device's osd_name and pid the FS was
mounted/unmounted on.

TODO: How to also print the namespace path the filesystem was
      mounted on?

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index 9f500dec3b59..920f0165edf3 100644
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -257,6 +257,15 @@ static void exofs_write_super(struct super_block *sb)
                 sb->s_dirt = 0;
 }
 
+static void _exofs_print_device(const char *msg, const char *dev_path,
+                                struct osd_dev *od, u64 pid)
+{
+        const struct osd_dev_info *odi = osduld_device_info(od);
+
+        printk(KERN_NOTICE "exofs: %s %s osd_name-%s pid-0x%llx\n",
+                msg, dev_path ?: "", odi->osdname, _LLU(pid));
+}
+
 /*
  * This function is called when the vfs is freeing the superblock.  We just
  * need to free our own part.
@@ -279,6 +288,7 @@ static void exofs_put_super(struct super_block *sb)
                                   msecs_to_jiffies(100));
         }
 
+        _exofs_print_device("Unmounting", NULL, sbi->s_dev, sbi->s_pid);
         osduld_put_device(sbi->s_dev);
         kfree(sb->s_fs_info);
         sb->s_fs_info = NULL;
@@ -395,6 +405,7 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent)
                 goto free_sbi;
         }
 
+        _exofs_print_device("Mounting", opts->dev_name, sbi->s_dev, sbi->s_pid);
         ret = 0;
 out:
         if (or)