Commit 6aefd93b authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: introduce background_gc=sync mount option 



This patch introduce background_gc=sync enabling synchronous cleaning in
background.

Reviewed-by: default avatarChao Yu <chao2.yu@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 456b88e4

Documentation/filesystems/f2fs.txt

+2 −1
Original line number Diff line number Diff line
@@ -102,7 +102,8 @@ background_gc=%s Turn on/off cleaning operations, namely garbage 
                       collection, triggered in background when I/O subsystem is

                       idle. If background_gc=on, it will turn on the garbage

                       collection and if background_gc=off, garbage collection

                       will be truned off.

                       will be truned off. If background_gc=sync, it will turn

                       on synchronous garbage collection running in background.

                       Default value for this option is on. So garbage

                       collection is on by default.

disable_roll_forward   Disable the roll-forward recovery routine

fs/f2fs/f2fs.h

+1 −0
Original line number Diff line number Diff line
@@ -53,6 +53,7 @@ 
#define F2FS_MOUNT_NOBARRIER		0x00000800

#define F2FS_MOUNT_FASTBOOT		0x00001000

#define F2FS_MOUNT_EXTENT_CACHE		0x00002000

#define F2FS_MOUNT_FORCE_FG_GC		0x00004000



#define clear_opt(sbi, option)	(sbi->mount_opt.opt &= ~F2FS_MOUNT_##option)

#define set_opt(sbi, option)	(sbi->mount_opt.opt |= F2FS_MOUNT_##option)

fs/f2fs/gc.c

+1 −1
Original line number Diff line number Diff line
@@ -78,7 +78,7 @@ static int gc_thread_func(void *data) 
		stat_inc_bggc_count(sbi);



		/* if return value is not zero, no victim was selected */

		if (f2fs_gc(sbi, false))

		if (f2fs_gc(sbi, test_opt(sbi, FORCE_FG_GC)))

			wait_ms = gc_th->no_gc_sleep_time;



		/* balancing f2fs's metadata periodically */

fs/f2fs/segment.h

+3 −1
Original line number Diff line number Diff line
@@ -137,10 +137,12 @@ enum { 
/*

 * BG_GC means the background cleaning job.

 * FG_GC means the on-demand cleaning job.

 * FORCE_FG_GC means on-demand cleaning job in background.

 */

enum {

	BG_GC = 0,

	FG_GC

	FG_GC,

	FORCE_FG_GC,

};



/* for a function parameter to select a victim segment */

fs/f2fs/super.c

+15 −6
Original line number Diff line number Diff line
@@ -292,11 +292,16 @@ static int parse_options(struct super_block *sb, char *options) 


			if (!name)

				return -ENOMEM;

			if (strlen(name) == 2 && !strncmp(name, "on", 2))

			if (strlen(name) == 2 && !strncmp(name, "on", 2)) {

				set_opt(sbi, BG_GC);

			else if (strlen(name) == 3 && !strncmp(name, "off", 3))

				clear_opt(sbi, FORCE_FG_GC);

			} else if (strlen(name) == 3 && !strncmp(name, "off", 3)) {

				clear_opt(sbi, BG_GC);

			else {

				clear_opt(sbi, FORCE_FG_GC);

			} else if (strlen(name) == 4 && !strncmp(name, "sync", 4)) {

				set_opt(sbi, BG_GC);

				set_opt(sbi, FORCE_FG_GC);

			} else {

				kfree(name);

				return -EINVAL;

			}
@@ -631,10 +636,14 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root) 
{

	struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);



	if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC))

		seq_printf(seq, ",background_gc=%s", "on");

	if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC)) {

		if (test_opt(sbi, FORCE_FG_GC))

			seq_printf(seq, ",background_gc=%s", "sync");

		else

			seq_printf(seq, ",background_gc=%s", "on");

	} else {

		seq_printf(seq, ",background_gc=%s", "off");

	}

	if (test_opt(sbi, DISABLE_ROLL_FORWARD))

		seq_puts(seq, ",disable_roll_forward");

	if (test_opt(sbi, DISCARD))

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