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Commit d5053a34 authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: introduce -o fastboot for reducing booting time only 



If a system wants to reduce the booting time as a top priority, now we can
use a mount option, -o fastboot.
With this option, f2fs conducts a little bit slow write_checkpoint, but
it can avoid the node page reads during the next mount time.

Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent be138b7b

Documentation/filesystems/f2fs.txt

+3 −0
Original line number Diff line number Diff line
@@ -135,6 +135,9 @@ nobarrier This option can be used if underlying storage guarantees 
		       If this option is set, no cache_flush commands are issued

		       but f2fs still guarantees the write ordering of all the

		       data writes.

fastboot               This option is used when a system wants to reduce mount

                       time as much as possible, even though normal performance

		       can be sacrificed.



================================================================================

DEBUGFS ENTRIES

fs/f2fs/f2fs.h

+1 −0
Original line number Diff line number Diff line
@@ -49,6 +49,7 @@ 
#define F2FS_MOUNT_INLINE_DENTRY	0x00000200

#define F2FS_MOUNT_FLUSH_MERGE		0x00000400

#define F2FS_MOUNT_NOBARRIER		0x00000800

#define F2FS_MOUNT_FASTBOOT		0x00001000



#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/file.c

+2 −0
Original line number Diff line number Diff line
@@ -130,6 +130,8 @@ static inline bool need_do_checkpoint(struct inode *inode) 
		need_cp = true;

	else if (F2FS_I(inode)->xattr_ver == cur_cp_version(F2FS_CKPT(sbi)))

		need_cp = true;

	else if (test_opt(sbi, FASTBOOT))

		need_cp = true;



	return need_cp;

}

fs/f2fs/gc.c

+3 −3
Original line number Diff line number Diff line
@@ -695,9 +695,9 @@ int f2fs_gc(struct f2fs_sb_info *sbi) 
	int gc_type = BG_GC;

	int nfree = 0;

	int ret = -1;

	struct cp_control cpc = {

		.reason = CP_SYNC,

	};

	struct cp_control cpc;



	cpc.reason = test_opt(sbi, FASTBOOT) ? CP_UMOUNT : CP_SYNC;



	INIT_LIST_HEAD(&ilist);

gc_more:

fs/f2fs/super.c

+10 −3
Original line number Diff line number Diff line
@@ -54,6 +54,7 @@ enum { 
	Opt_inline_dentry,

	Opt_flush_merge,

	Opt_nobarrier,

	Opt_fastboot,

	Opt_err,

};
@@ -73,6 +74,7 @@ static match_table_t f2fs_tokens = { 
	{Opt_inline_dentry, "inline_dentry"},

	{Opt_flush_merge, "flush_merge"},

	{Opt_nobarrier, "nobarrier"},

	{Opt_fastboot, "fastboot"},

	{Opt_err, NULL},

};
@@ -351,6 +353,9 @@ static int parse_options(struct super_block *sb, char *options) 
		case Opt_nobarrier:

			set_opt(sbi, NOBARRIER);

			break;

		case Opt_fastboot:

			set_opt(sbi, FASTBOOT);

			break;

		default:

			f2fs_msg(sb, KERN_ERR,

				"Unrecognized mount option \"%s\" or missing value",
@@ -479,9 +484,9 @@ int f2fs_sync_fs(struct super_block *sb, int sync) 
	trace_f2fs_sync_fs(sb, sync);



	if (sync) {

		struct cp_control cpc = {

			.reason = CP_SYNC,

		};

		struct cp_control cpc;



		cpc.reason = test_opt(sbi, FASTBOOT) ? CP_UMOUNT : CP_SYNC;

		mutex_lock(&sbi->gc_mutex);

		write_checkpoint(sbi, &cpc);

		mutex_unlock(&sbi->gc_mutex);
@@ -574,6 +579,8 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root) 
		seq_puts(seq, ",flush_merge");

	if (test_opt(sbi, NOBARRIER))

		seq_puts(seq, ",nobarrier");

	if (test_opt(sbi, FASTBOOT))

		seq_puts(seq, ",fastboot");

	seq_printf(seq, ",active_logs=%u", sbi->active_logs);



	return 0;