f2fs: detect idle time depending on user behavior

This patch adds last time that user requested filesystem operations.
This information is used to detect whether system is idle or not later.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Documentation/ABI/testing/sysfs-fs-f2fs

@@ -87,6 +87,12 @@ Contact:	"Jaegeuk Kim" <jaegeuk@kernel.org>
 Description:
 		 Controls the checkpoint timing.
 
+What:		/sys/fs/f2fs/<disk>/idle_interval
+Date:		January 2016
+Contact:	"Jaegeuk Kim" <jaegeuk@kernel.org>
+Description:
+		 Controls the idle timing.
+
 What:		/sys/fs/f2fs/<disk>/ra_nid_pages
 Date:		October 2015
 Contact:	"Chao Yu" <chao2.yu@samsung.com>

fs/f2fs/data.c

@@ -1596,6 +1596,7 @@ static int f2fs_write_end(struct file *file,
 	}
 
 	f2fs_put_page(page, 1);
+	f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
 	return copied;
 }
 

fs/f2fs/dir.c

@@ -636,6 +636,7 @@ fail:
 	f2fs_put_page(dentry_page, 1);
 out:
 	f2fs_fname_free_filename(&fname);
+	f2fs_update_time(F2FS_I_SB(dir), REQ_TIME);
 	return err;
 }
 
@@ -657,6 +658,7 @@ int f2fs_do_tmpfile(struct inode *inode, struct inode *dir)
 	clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
 fail:
 	up_write(&F2FS_I(inode)->i_sem);
+	f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
 	return err;
 }
 
@@ -701,6 +703,8 @@ void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
 	int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
 	int i;
 
+	f2fs_update_time(F2FS_I_SB(dir), REQ_TIME);
+
 	if (f2fs_has_inline_dentry(dir))
 		return f2fs_delete_inline_entry(dentry, page, dir, inode);
 

fs/f2fs/f2fs.h

@@ -21,6 +21,7 @@
 #include <linux/sched.h>
 #include <linux/vmalloc.h>
 #include <linux/bio.h>
+#include <linux/blkdev.h>
 
 #ifdef CONFIG_F2FS_CHECK_FS
 #define f2fs_bug_on(sbi, condition)	BUG_ON(condition)
@@ -126,6 +127,7 @@ enum {
 #define BATCHED_TRIM_BLOCKS(sbi)	\
 		(BATCHED_TRIM_SEGMENTS(sbi) << (sbi)->log_blocks_per_seg)
 #define DEF_CP_INTERVAL			60	/* 60 secs */
+#define DEF_IDLE_INTERVAL		120	/* 2 mins */
 
 struct cp_control {
 	int reason;
@@ -723,6 +725,7 @@ enum {
 
 enum {
 	CP_TIME,
+	REQ_TIME,
 	MAX_TIME,
 };
 
@@ -856,6 +859,18 @@ static inline bool f2fs_time_over(struct f2fs_sb_info *sbi, int type)
 	return time_after(jiffies, sbi->last_time[type] + interval);
 }
 
+static inline bool is_idle(struct f2fs_sb_info *sbi)
+{
+	struct block_device *bdev = sbi->sb->s_bdev;
+	struct request_queue *q = bdev_get_queue(bdev);
+	struct request_list *rl = &q->root_rl;
+
+	if (rl->count[BLK_RW_SYNC] || rl->count[BLK_RW_ASYNC])
+		return 0;
+
+	return f2fs_time_over(sbi, REQ_TIME);
+}
+
 /*
  * Inline functions
  */

fs/f2fs/file.c

@@ -96,6 +96,7 @@ mapped:
 	clear_cold_data(page);
 out:
 	sb_end_pagefault(inode->i_sb);
+	f2fs_update_time(sbi, REQ_TIME);
 	return block_page_mkwrite_return(err);
 }
 
@@ -280,6 +281,7 @@ flush_out:
 	remove_ino_entry(sbi, ino, UPDATE_INO);
 	clear_inode_flag(fi, FI_UPDATE_WRITE);
 	ret = f2fs_issue_flush(sbi);
+	f2fs_update_time(sbi, REQ_TIME);
 out:
 	trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
 	f2fs_trace_ios(NULL, 1);
@@ -485,6 +487,7 @@ int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
 	}
 	dn->ofs_in_node = ofs;
 
+	f2fs_update_time(sbi, REQ_TIME);
 	trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
 					 dn->ofs_in_node, nr_free);
 	return nr_free;
@@ -1236,6 +1239,7 @@ static long f2fs_fallocate(struct file *file, int mode,
 	if (!ret) {
 		inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 		mark_inode_dirty(inode);
+		f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
 	}
 
 out:
@@ -1351,6 +1355,8 @@ static int f2fs_ioc_start_atomic_write(struct file *filp)
 		return ret;
 
 	set_inode_flag(F2FS_I(inode), FI_ATOMIC_FILE);
+	f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
+
 	return 0;
 }
 
@@ -1398,6 +1404,7 @@ static int f2fs_ioc_start_volatile_write(struct file *filp)
 		return ret;
 
 	set_inode_flag(F2FS_I(inode), FI_VOLATILE_FILE);
+	f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
 	return 0;
 }
 
@@ -1439,6 +1446,7 @@ static int f2fs_ioc_abort_volatile_write(struct file *filp)
 	}
 
 	mnt_drop_write_file(filp);
+	f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
 	return ret;
 }
 
@@ -1478,6 +1486,7 @@ static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg)
 	default:
 		return -EINVAL;
 	}
+	f2fs_update_time(sbi, REQ_TIME);
 	return 0;
 }
 
@@ -1508,6 +1517,7 @@ static int f2fs_ioc_fitrim(struct file *filp, unsigned long arg)
 	if (copy_to_user((struct fstrim_range __user *)arg, &range,
 				sizeof(range)))
 		return -EFAULT;
+	f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
 	return 0;
 }
 
@@ -1531,6 +1541,7 @@ static int f2fs_ioc_set_encryption_policy(struct file *filp, unsigned long arg)
 				sizeof(policy)))
 		return -EFAULT;
 
+	f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
 	return f2fs_process_policy(&policy, inode);
 #else
 	return -EOPNOTSUPP;
@@ -1807,6 +1818,7 @@ static int f2fs_ioc_defragment(struct file *filp, unsigned long arg)
 	}
 
 	err = f2fs_defragment_range(sbi, filp, &range);
+	f2fs_update_time(sbi, REQ_TIME);
 	if (err < 0)
 		goto out;
 

fs/f2fs/gc.c

@@ -16,7 +16,6 @@
 #include <linux/kthread.h>
 #include <linux/delay.h>
 #include <linux/freezer.h>
-#include <linux/blkdev.h>
 
 #include "f2fs.h"
 #include "node.h"

fs/f2fs/gc.h

@@ -100,11 +100,3 @@ static inline bool has_enough_invalid_blocks(struct f2fs_sb_info *sbi)
 		return true;
 	return false;
 }
-
-static inline int is_idle(struct f2fs_sb_info *sbi)
-{
-	struct block_device *bdev = sbi->sb->s_bdev;
-	struct request_queue *q = bdev_get_queue(bdev);
-	struct request_list *rl = &q->root_rl;
-	return !(rl->count[BLK_RW_SYNC]) && !(rl->count[BLK_RW_ASYNC]);
-}

fs/f2fs/segment.c

@@ -293,7 +293,7 @@ void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)
 	if (!available_free_memory(sbi, NAT_ENTRIES) ||
 			excess_prefree_segs(sbi) ||
 			!available_free_memory(sbi, INO_ENTRIES) ||
-			f2fs_time_over(sbi, CP_TIME)) {
+			(is_idle(sbi) && f2fs_time_over(sbi, CP_TIME))) {
 		if (test_opt(sbi, DATA_FLUSH))
 			sync_dirty_inodes(sbi, FILE_INODE);
 		f2fs_sync_fs(sbi->sb, true);

fs/f2fs/super.c

@@ -219,6 +219,7 @@ F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages);
 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]);
+F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]);
 
 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
 static struct attribute *f2fs_attrs[] = {
@@ -237,6 +238,7 @@ static struct attribute *f2fs_attrs[] = {
 	ATTR_LIST(ram_thresh),
 	ATTR_LIST(ra_nid_pages),
 	ATTR_LIST(cp_interval),
+	ATTR_LIST(idle_interval),
 	NULL,
 };
 
@@ -1123,6 +1125,7 @@ static void init_sb_info(struct f2fs_sb_info *sbi)
 
 	sbi->dir_level = DEF_DIR_LEVEL;
 	sbi->interval_time[CP_TIME] = DEF_CP_INTERVAL;
+	sbi->interval_time[REQ_TIME] = DEF_IDLE_INTERVAL;
 	clear_sbi_flag(sbi, SBI_NEED_FSCK);
 
 	INIT_LIST_HEAD(&sbi->s_list);
@@ -1468,6 +1471,7 @@ try_onemore:
 	}
 
 	f2fs_update_time(sbi, CP_TIME);
+	f2fs_update_time(sbi, REQ_TIME);
 	return 0;
 
 free_kobj:

fs/f2fs/xattr.c

@@ -618,5 +618,6 @@ int f2fs_setxattr(struct inode *inode, int index, const char *name,
 	up_write(&F2FS_I(inode)->i_sem);
 	f2fs_unlock_op(sbi);
 
+	f2fs_update_time(sbi, REQ_TIME);
 	return err;
 }