ocfs2: core atime update functions

This patch adds the core routines for updating atime in ocfs2.
Signed-off-by: Tiger Yang <tiger.yang@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

fs/ocfs2/dlmglue.c

@@ -49,6 +49,7 @@
 #include "dcache.h"
 #include "dlmglue.h"
 #include "extent_map.h"
+#include "file.h"
 #include "heartbeat.h"
 #include "inode.h"
 #include "journal.h"
@@ -1723,6 +1724,44 @@ int ocfs2_meta_lock_with_page(struct inode *inode,
 	return ret;
 }
 
+int ocfs2_meta_lock_atime(struct inode *inode,
+			  struct vfsmount *vfsmnt,
+			  int *level)
+{
+	int ret;
+
+	mlog_entry_void();
+	ret = ocfs2_meta_lock(inode, NULL, 0);
+	if (ret < 0) {
+		mlog_errno(ret);
+		return ret;
+	}
+
+	/*
+	 * If we should update atime, we will get EX lock,
+	 * otherwise we just get PR lock.
+	 */
+	if (ocfs2_should_update_atime(inode, vfsmnt)) {
+		struct buffer_head *bh = NULL;
+
+		ocfs2_meta_unlock(inode, 0);
+		ret = ocfs2_meta_lock(inode, &bh, 1);
+		if (ret < 0) {
+			mlog_errno(ret);
+			return ret;
+		}
+		*level = 1;
+		if (ocfs2_should_update_atime(inode, vfsmnt))
+			ocfs2_update_inode_atime(inode, bh);
+		if (bh)
+			brelse(bh);
+	} else
+		*level = 0;
+
+	mlog_exit(ret);
+	return ret;
+}
+
 void ocfs2_meta_unlock(struct inode *inode,
 		       int ex)
 {

fs/ocfs2/dlmglue.h

@@ -80,6 +80,9 @@ void ocfs2_data_unlock(struct inode *inode,
 		       int write);
 int ocfs2_rw_lock(struct inode *inode, int write);
 void ocfs2_rw_unlock(struct inode *inode, int write);
+int ocfs2_meta_lock_atime(struct inode *inode,
+			  struct vfsmount *vfsmnt,
+			  int *level);
 int ocfs2_meta_lock_full(struct inode *inode,
 			 struct buffer_head **ret_bh,
 			 int ex,

fs/ocfs2/file.c

@@ -32,6 +32,7 @@
 #include <linux/uio.h>
 #include <linux/sched.h>
 #include <linux/pipe_fs_i.h>
+#include <linux/mount.h>
 
 #define MLOG_MASK_PREFIX ML_INODE
 #include <cluster/masklog.h>
@@ -135,6 +136,57 @@ static int ocfs2_sync_file(struct file *file,
 	return (err < 0) ? -EIO : 0;
 }
 
+int ocfs2_should_update_atime(struct inode *inode,
+			      struct vfsmount *vfsmnt)
+{
+	struct timespec now;
+	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+	if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
+		return 0;
+
+	if ((inode->i_flags & S_NOATIME) ||
+	    ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)))
+		return 0;
+
+	if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
+	    ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
+		return 0;
+
+	now = CURRENT_TIME;
+	if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum))
+		return 0;
+	else
+		return 1;
+}
+
+int ocfs2_update_inode_atime(struct inode *inode,
+			     struct buffer_head *bh)
+{
+	int ret;
+	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+	handle_t *handle;
+
+	mlog_entry_void();
+
+	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
+	if (handle == NULL) {
+		ret = -ENOMEM;
+		mlog_errno(ret);
+		goto out;
+	}
+
+	inode->i_atime = CURRENT_TIME;
+	ret = ocfs2_mark_inode_dirty(handle, inode, bh);
+	if (ret < 0)
+		mlog_errno(ret);
+
+	ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
+out:
+	mlog_exit(ret);
+	return ret;
+}
+
 int ocfs2_set_inode_size(handle_t *handle,
 			 struct inode *inode,
 			 struct buffer_head *fe_bh,

fs/ocfs2/file.h

@@ -54,4 +54,9 @@ int ocfs2_set_inode_size(handle_t *handle,
 			 struct buffer_head *fe_bh,
 			 u64 new_i_size);
 
+int ocfs2_should_update_atime(struct inode *inode,
+			      struct vfsmount *vfsmnt);
+int ocfs2_update_inode_atime(struct inode *inode,
+			     struct buffer_head *bh);
+
 #endif /* OCFS2_FILE_H */

fs/ocfs2/inode.c

@@ -360,7 +360,6 @@ int ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
 				  inode);
 
 	ocfs2_set_inode_flags(inode);
-	inode->i_flags |= S_NOATIME;
 
 	status = 0;
 bail:

fs/ocfs2/ocfs2.h

@@ -180,6 +180,7 @@ enum ocfs2_mount_options
 #define OCFS2_OSB_SOFT_RO	0x0001
 #define OCFS2_OSB_HARD_RO	0x0002
 #define OCFS2_OSB_ERROR_FS	0x0004
+#define OCFS2_DEFAULT_ATIME_QUANTUM	60
 
 struct ocfs2_journal;
 struct ocfs2_super
@@ -218,6 +219,7 @@ struct ocfs2_super
 	unsigned long osb_flags;
 
 	unsigned long s_mount_opt;
+	unsigned int s_atime_quantum;
 
 	u16 max_slots;
 	s16 node_num;

fs/ocfs2/super.c

@@ -139,6 +139,7 @@ enum {
 	Opt_hb_local,
 	Opt_data_ordered,
 	Opt_data_writeback,
+	Opt_atime_quantum,
 	Opt_err,
 };
 
@@ -152,6 +153,7 @@ static match_table_t tokens = {
 	{Opt_hb_local, OCFS2_HB_LOCAL},
 	{Opt_data_ordered, "data=ordered"},
 	{Opt_data_writeback, "data=writeback"},
+	{Opt_atime_quantum, "atime_quantum=%u"},
 	{Opt_err, NULL}
 };
 
@@ -705,6 +707,7 @@ static int ocfs2_parse_options(struct super_block *sb,
 	while ((p = strsep(&options, ",")) != NULL) {
 		int token, option;
 		substring_t args[MAX_OPT_ARGS];
+		struct ocfs2_super * osb = OCFS2_SB(sb);
 
 		if (!*p)
 			continue;
@@ -745,6 +748,16 @@ static int ocfs2_parse_options(struct super_block *sb,
 		case Opt_data_writeback:
 			*mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
 			break;
+		case Opt_atime_quantum:
+			if (match_int(&args[0], &option)) {
+				status = 0;
+				goto bail;
+			}
+			if (option >= 0)
+				osb->s_atime_quantum = option;
+			else
+				osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
+			break;
 		default:
 			mlog(ML_ERROR,
 			     "Unrecognized mount option \"%s\" "
@@ -1265,6 +1278,8 @@ static int ocfs2_initialize_super(struct super_block *sb,
 	init_waitqueue_head(&osb->checkpoint_event);
 	atomic_set(&osb->needs_checkpoint, 0);
 
+	osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
+
 	osb->node_num = O2NM_INVALID_NODE_NUM;
 	osb->slot_num = OCFS2_INVALID_SLOT;