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Subject[PATCH v4] f2fs: support soft block reservation
Date
It renames reserved_blocks sysfs interface to target_reserved_blocks,
and supports to extend it to be soft threshold, which allows user
configure it exceeding current available user space. So this patch
also introduces a new sysfs interface called current_reserved_blocks to
show the current blocks which have already been reserved.

Signed-off-by: Yunlong Song <yunlong.song@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
Documentation/ABI/testing/sysfs-fs-f2fs | 15 +++++++++++++--
fs/f2fs/f2fs.h | 15 ++++++++++++---
fs/f2fs/super.c | 5 +++--
fs/f2fs/sysfs.c | 20 +++++++++++++++-----
4 files changed, 43 insertions(+), 12 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index 11b7f4e..482d78b 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -134,11 +134,22 @@ Contact: "Sheng Yong" <shengyong1@huawei.com>
Description:
Controls the injection type.

-What: /sys/fs/f2fs/<disk>/reserved_blocks
+What: /sys/fs/f2fs/<disk>/target_reserved_blocks
Date: June 2017
Contact: "Chao Yu" <yuchao0@huawei.com>
Description:
- Controls current reserved blocks in system.
+ Controls target reserved blocks in system, the threshold
+ is soft, it could exceed current available user space.
+
+What: /sys/fs/f2fs/<disk>/current_reserved_blocks
+Date: October 2017
+Contact: "Yunlong Song" <yunlong.song@huawei.com>
+Contact: "Chao Yu" <yuchao0@huawei.com>
+Description:
+ Shows current reserved blocks in system, it may be temporarily
+ smaller than target_reserved_blocks, but will gradually
+ increase to target_reserved_blocks when more free blocks are
+ freed by user later.

What: /sys/fs/f2fs/<disk>/gc_urgent
Date: August 2017
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 13a96b8..c26fccb 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1081,7 +1081,8 @@ struct f2fs_sb_info {
block_t total_valid_block_count; /* # of valid blocks */
block_t discard_blks; /* discard command candidats */
block_t last_valid_block_count; /* for recovery */
- block_t reserved_blocks; /* configurable reserved blocks */
+ block_t target_reserved_blocks; /* configurable reserved blocks */
+ block_t current_reserved_blocks; /* current reserved blocks */

u32 s_next_generation; /* for NFS support */

@@ -1557,7 +1558,8 @@ static inline int inc_valid_block_count(struct f2fs_sb_info *sbi,

spin_lock(&sbi->stat_lock);
sbi->total_valid_block_count += (block_t)(*count);
- avail_user_block_count = sbi->user_block_count - sbi->reserved_blocks;
+ avail_user_block_count = sbi->user_block_count -
+ sbi->current_reserved_blocks;
if (unlikely(sbi->total_valid_block_count > avail_user_block_count)) {
diff = sbi->total_valid_block_count - avail_user_block_count;
*count -= diff;
@@ -1591,6 +1593,10 @@ static inline void dec_valid_block_count(struct f2fs_sb_info *sbi,
f2fs_bug_on(sbi, sbi->total_valid_block_count < (block_t) count);
f2fs_bug_on(sbi, inode->i_blocks < sectors);
sbi->total_valid_block_count -= (block_t)count;
+ if (sbi->target_reserved_blocks &&
+ sbi->current_reserved_blocks < sbi->target_reserved_blocks)
+ sbi->current_reserved_blocks = min(sbi->target_reserved_blocks,
+ sbi->current_reserved_blocks + count);
spin_unlock(&sbi->stat_lock);
f2fs_i_blocks_write(inode, count, false, true);
}
@@ -1737,7 +1743,7 @@ static inline int inc_valid_node_count(struct f2fs_sb_info *sbi,
spin_lock(&sbi->stat_lock);

valid_block_count = sbi->total_valid_block_count + 1;
- if (unlikely(valid_block_count + sbi->reserved_blocks >
+ if (unlikely(valid_block_count + sbi->current_reserved_blocks >
sbi->user_block_count)) {
spin_unlock(&sbi->stat_lock);
goto enospc;
@@ -1780,6 +1786,9 @@ static inline void dec_valid_node_count(struct f2fs_sb_info *sbi,

sbi->total_valid_node_count--;
sbi->total_valid_block_count--;
+ if (sbi->target_reserved_blocks &&
+ sbi->current_reserved_blocks < sbi->target_reserved_blocks)
+ sbi->current_reserved_blocks++;

spin_unlock(&sbi->stat_lock);

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 213d2c1..c682978 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -987,7 +987,7 @@ static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
buf->f_blocks = total_count - start_count;
buf->f_bfree = user_block_count - valid_user_blocks(sbi) + ovp_count;
buf->f_bavail = user_block_count - valid_user_blocks(sbi) -
- sbi->reserved_blocks;
+ sbi->current_reserved_blocks;

avail_node_count = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;

@@ -2457,7 +2457,8 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
sbi->total_valid_block_count =
le64_to_cpu(sbi->ckpt->valid_block_count);
sbi->last_valid_block_count = sbi->total_valid_block_count;
- sbi->reserved_blocks = 0;
+ sbi->target_reserved_blocks = 0;
+ sbi->current_reserved_blocks = 0;

for (i = 0; i < NR_INODE_TYPE; i++) {
INIT_LIST_HEAD(&sbi->inode_list[i]);
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index e09e59c..568e32f 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -30,7 +30,7 @@ enum {
FAULT_INFO_RATE, /* struct f2fs_fault_info */
FAULT_INFO_TYPE, /* struct f2fs_fault_info */
#endif
- RESERVED_BLOCKS,
+ RESERVED_BLOCKS, /* struct f2fs_sb_info */
};

struct f2fs_attr {
@@ -114,6 +114,12 @@ static ssize_t features_show(struct f2fs_attr *a,
return len;
}

+static ssize_t current_reserved_blocks_show(struct f2fs_attr *a,
+ struct f2fs_sb_info *sbi, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%u\n", sbi->current_reserved_blocks);
+}
+
static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
struct f2fs_sb_info *sbi, char *buf)
{
@@ -153,12 +159,13 @@ static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
#endif
if (a->struct_type == RESERVED_BLOCKS) {
spin_lock(&sbi->stat_lock);
- if ((unsigned long)sbi->total_valid_block_count + t >
- (unsigned long)sbi->user_block_count) {
+ if (t > (unsigned long)sbi->user_block_count) {
spin_unlock(&sbi->stat_lock);
return -EINVAL;
}
*ui = t;
+ sbi->current_reserved_blocks = min(sbi->target_reserved_blocks,
+ sbi->user_block_count - valid_user_blocks(sbi));
spin_unlock(&sbi->stat_lock);
return count;
}
@@ -272,7 +279,8 @@ static ssize_t f2fs_feature_show(struct f2fs_attr *a,
F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, max_small_discards, max_discards);
F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, discard_granularity, discard_granularity);
-F2FS_RW_ATTR(RESERVED_BLOCKS, f2fs_sb_info, reserved_blocks, reserved_blocks);
+F2FS_RW_ATTR(RESERVED_BLOCKS, f2fs_sb_info, target_reserved_blocks,
+ target_reserved_blocks);
F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
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);
@@ -293,6 +301,7 @@ static ssize_t f2fs_feature_show(struct f2fs_attr *a,
F2FS_GENERAL_RO_ATTR(dirty_segments);
F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);
F2FS_GENERAL_RO_ATTR(features);
+F2FS_GENERAL_RO_ATTR(current_reserved_blocks);

#ifdef CONFIG_F2FS_FS_ENCRYPTION
F2FS_FEATURE_RO_ATTR(encryption, FEAT_CRYPTO);
@@ -337,7 +346,8 @@ static ssize_t f2fs_feature_show(struct f2fs_attr *a,
ATTR_LIST(dirty_segments),
ATTR_LIST(lifetime_write_kbytes),
ATTR_LIST(features),
- ATTR_LIST(reserved_blocks),
+ ATTR_LIST(target_reserved_blocks),
+ ATTR_LIST(current_reserved_blocks),
NULL,
};

--
1.8.5.2
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