ext4: update the s_last_mounted field in the superblock

This field can be very helpful when a system administrator is trying
to sort through large numbers of block devices or filesystem images.
What is stored in this field can be ambiguous if multiple filesystem
namespaces are in play; what we store in practice is the mountpoint
interpreted by the process's namespace which first opens a file in the
filesystem.

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

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 569f527..9e268c9 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -834,6 +834,12 @@ struct ext4_super_block {
 };
 
 #ifdef __KERNEL__
+
+/*
+ * Mount flags
+ */
+#define EXT4_MF_MNTDIR_SAMPLED	0x0001
+
 /*
  * fourth extended-fs super-block data in memory
  */
@@ -853,6 +859,7 @@ struct ext4_sb_info {
 	struct ext4_super_block *s_es;	/* Pointer to the super block in the buffer */
 	struct buffer_head **s_group_desc;
 	unsigned int s_mount_opt;
+	unsigned int s_mount_flags;
 	ext4_fsblk_t s_sb_block;
 	uid_t s_resuid;
 	gid_t s_resgid;