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-rw-r--r--Documentation/filesystems/f2fs.txt11
-rw-r--r--fs/f2fs/f2fs.h3
-rw-r--r--fs/f2fs/segment.c2
-rw-r--r--fs/f2fs/segment.h44
-rw-r--r--fs/f2fs/super.c4
5 files changed, 58 insertions, 6 deletions
diff --git a/Documentation/filesystems/f2fs.txt b/Documentation/filesystems/f2fs.txt
index a3fe811bbdbc..1a94ac7fee86 100644
--- a/Documentation/filesystems/f2fs.txt
+++ b/Documentation/filesystems/f2fs.txt
@@ -171,6 +171,17 @@ Files in /sys/fs/f2fs/<devname>
conduct checkpoint to reclaim the prefree segments
to free segments. By default, 100 segments, 200MB.
+ 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_DISABLE.
+
+ min_ipu_util This parameter controls the threshold to trigger
+ in-place-updates. The number indicates percentage
+ of the filesystem utilization, and used by
+ F2FS_IPU_UTIL and F2FS_IPU_SSR_UTIL policies.
+
================================================================================
USAGE
================================================================================
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 022ce324b166..1b05a628670a 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -325,6 +325,9 @@ struct f2fs_sm_info {
struct list_head discard_list; /* 4KB discard list */
int nr_discards; /* # of discards in the list */
int max_discards; /* max. discards to be issued */
+
+ unsigned int ipu_policy; /* in-place-update policy */
+ unsigned int min_ipu_util; /* in-place-update threshold */
};
/*
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 0b2e8ceec983..5b890ce74b15 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1799,6 +1799,8 @@ int build_segment_manager(struct f2fs_sb_info *sbi)
sm_info->main_segments = le32_to_cpu(raw_super->segment_count_main);
sm_info->ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr);
sm_info->rec_prefree_segments = DEF_RECLAIM_PREFREE_SEGMENTS;
+ sm_info->ipu_policy = F2FS_IPU_DISABLE;
+ sm_info->min_ipu_util = DEF_MIN_IPU_UTIL;
INIT_LIST_HEAD(&sm_info->discard_list);
sm_info->nr_discards = 0;
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index ea563760f4b7..e9a10bdd7fed 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -476,19 +476,51 @@ static inline int utilization(struct f2fs_sb_info *sbi)
/*
* Sometimes f2fs may be better to drop out-of-place update policy.
- * So, if fs utilization is over MIN_IPU_UTIL, then f2fs tries to write
- * data in the original place likewise other traditional file systems.
- * But, currently set 100 in percentage, which means it is disabled.
- * See below need_inplace_update().
+ * And, users can control the policy through sysfs entries.
+ * There are five policies with triggering conditions as follows.
+ * F2FS_IPU_FORCE - all the time,
+ * F2FS_IPU_SSR - if SSR mode is activated,
+ * F2FS_IPU_UTIL - if FS utilization is over threashold,
+ * F2FS_IPU_SSR_UTIL - if SSR mode is activated and FS utilization is over
+ * threashold,
+ * F2FS_IPUT_DISABLE - disable IPU. (=default option)
*/
-#define MIN_IPU_UTIL 100
+#define DEF_MIN_IPU_UTIL 70
+
+enum {
+ F2FS_IPU_FORCE,
+ F2FS_IPU_SSR,
+ F2FS_IPU_UTIL,
+ F2FS_IPU_SSR_UTIL,
+ F2FS_IPU_DISABLE,
+};
+
static inline bool need_inplace_update(struct inode *inode)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
+
+ /* IPU can be done only for the user data */
if (S_ISDIR(inode->i_mode))
return false;
- if (need_SSR(sbi) && utilization(sbi) > MIN_IPU_UTIL)
+
+ switch (SM_I(sbi)->ipu_policy) {
+ case F2FS_IPU_FORCE:
return true;
+ case F2FS_IPU_SSR:
+ if (need_SSR(sbi))
+ return true;
+ break;
+ case F2FS_IPU_UTIL:
+ if (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)
+ return true;
+ break;
+ case F2FS_IPU_DISABLE:
+ break;
+ }
return false;
}
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 5c574fa1143c..f16da92a7899 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -178,6 +178,8 @@ F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
+F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
+F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
static struct attribute *f2fs_attrs[] = {
@@ -187,6 +189,8 @@ static struct attribute *f2fs_attrs[] = {
ATTR_LIST(gc_idle),
ATTR_LIST(reclaim_segments),
ATTR_LIST(max_small_discards),
+ ATTR_LIST(ipu_policy),
+ ATTR_LIST(min_ipu_util),
NULL,
};