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Commit 9b5f136f authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: change the ipu_policy option to enable combinations 



This patch changes the ipu_policy setting to use any combination of orthogonal policies.

Signed-off-by: default avatarChangman Lee <cm224.lee@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 210f41bc

Documentation/filesystems/f2fs.txt

+3 −3
Original line number Diff line number Diff line
@@ -192,9 +192,9 @@ Files in /sys/fs/f2fs/<devname> 


 ipu_policy                   This parameter controls the policy of in-place

                              updates in f2fs. There are five policies:

                               0: F2FS_IPU_FORCE, 1: F2FS_IPU_SSR,

                               2: F2FS_IPU_UTIL,  3: F2FS_IPU_SSR_UTIL,

                               4: F2FS_IPU_FSYNC, 5: F2FS_IPU_DISABLE.

                               0x01: F2FS_IPU_FORCE, 0x02: F2FS_IPU_SSR,

                               0x04: F2FS_IPU_UTIL,  0x08: F2FS_IPU_SSR_UTIL,

                               0x10: F2FS_IPU_FSYNC.



 min_ipu_util                 This parameter controls the threshold to trigger

                              in-place-updates. The number indicates percentage

fs/f2fs/segment.c

+1 −1
Original line number Diff line number Diff line
@@ -1928,7 +1928,7 @@ int build_segment_manager(struct f2fs_sb_info *sbi) 
	sm_info->ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr);

	sm_info->rec_prefree_segments = sm_info->main_segments *

					DEF_RECLAIM_PREFREE_SEGMENTS / 100;

	sm_info->ipu_policy = F2FS_IPU_FSYNC;

	sm_info->ipu_policy = 1 << F2FS_IPU_FSYNC;

	sm_info->min_ipu_util = DEF_MIN_IPU_UTIL;

	sm_info->min_fsync_blocks = DEF_MIN_FSYNC_BLOCKS;

fs/f2fs/segment.h

+16 −23
Original line number Diff line number Diff line
@@ -487,40 +487,33 @@ enum { 
	F2FS_IPU_UTIL,

	F2FS_IPU_SSR_UTIL,

	F2FS_IPU_FSYNC,

	F2FS_IPU_DISABLE,

};



static inline bool need_inplace_update(struct inode *inode)

{

	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);

	unsigned int policy = SM_I(sbi)->ipu_policy;



	/* IPU can be done only for the user data */

	if (S_ISDIR(inode->i_mode))

		return false;



	switch (SM_I(sbi)->ipu_policy) {

	case F2FS_IPU_FORCE:

	if (policy & (0x1 << F2FS_IPU_FORCE))

		return true;

	case F2FS_IPU_SSR:

		if (need_SSR(sbi))

	if (policy & (0x1 << F2FS_IPU_SSR) && need_SSR(sbi))

		return true;

		break;

	case F2FS_IPU_UTIL:

		if (utilization(sbi) > SM_I(sbi)->min_ipu_util)

	if (policy & (0x1 << F2FS_IPU_UTIL) &&

			utilization(sbi) > SM_I(sbi)->min_ipu_util)

		return true;

		break;

	case F2FS_IPU_SSR_UTIL:

		if (need_SSR(sbi) && utilization(sbi) > SM_I(sbi)->min_ipu_util)

	if (policy & (0x1 << F2FS_IPU_SSR_UTIL) && need_SSR(sbi) &&

			utilization(sbi) > SM_I(sbi)->min_ipu_util)

		return true;

		break;

	case F2FS_IPU_FSYNC:



	/* this is only set during fdatasync */

		if (is_inode_flag_set(F2FS_I(inode), FI_NEED_IPU))

	if (policy & (0x1 << F2FS_IPU_FSYNC) &&

			is_inode_flag_set(F2FS_I(inode), FI_NEED_IPU))

		return true;

		break;

	case F2FS_IPU_DISABLE:

		break;

	}



	return false;

}