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Message-ID: <347e6612-3f58-a5d1-4ed2-482ccb4cccc6@kernel.org>
Date: Fri, 27 Oct 2017 20:36:34 +0800
From: Chao Yu <chao@...nel.org>
To: Yunlong Song <yunlong.song@...wei.com>, jaegeuk@...nel.org,
yuchao0@...wei.com, yunlong.song@...oud.com
Cc: linux-fsdevel@...r.kernel.org, miaoxie@...wei.com,
linux-kernel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH v5] f2fs: support soft block reservation
On 2017/10/27 19:47, Yunlong Song wrote:
> It supports to extend reserved_blocks sysfs interface to be soft
> threshold, which allows user configure it exceeding current available
> user space. This patch also introduces a new sysfs interface called
> current_reserved_blocks, which shows the current blocks that have
> already been reserved.
>
> Signed-off-by: Yunlong Song <yunlong.song@...wei.com>
> Signed-off-by: Chao Yu <yuchao0@...wei.com>
> ---
> Documentation/ABI/testing/sysfs-fs-f2fs | 15 +++++++++++++--
> fs/f2fs/f2fs.h | 13 +++++++++++--
> fs/f2fs/super.c | 3 ++-
> fs/f2fs/sysfs.c | 15 ++++++++++++---
> 4 files changed, 38 insertions(+), 8 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@...wei.com>
> Description:
> Controls the injection type.
>
> -What: /sys/fs/f2fs/<disk>/reserved_blocks
> +What: /sys/fs/f2fs/<disk>/target_reserved_blocks
It needs to keep old sysfs interface description as you did in code.
Thanks,
> Date: June 2017
> Contact: "Chao Yu" <yuchao0@...wei.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@...wei.com>
> +Contact: "Chao Yu" <yuchao0@...wei.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..5ed40fb 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -1082,6 +1082,7 @@ struct f2fs_sb_info {
> block_t discard_blks; /* discard command candidats */
> block_t last_valid_block_count; /* for recovery */
> block_t 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->reserved_blocks &&
> + sbi->current_reserved_blocks < sbi->reserved_blocks)
> + sbi->current_reserved_blocks = min(sbi->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->reserved_blocks &&
> + sbi->current_reserved_blocks < sbi->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..dab1fed 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;
>
> @@ -2458,6 +2458,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
> le64_to_cpu(sbi->ckpt->valid_block_count);
> sbi->last_valid_block_count = sbi->total_valid_block_count;
> sbi->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..4166ac7 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->reserved_blocks,
> + sbi->user_block_count - valid_user_blocks(sbi));
> spin_unlock(&sbi->stat_lock);
> return count;
> }
> @@ -293,6 +300,7 @@ 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);
> @@ -338,6 +346,7 @@ static ssize_t f2fs_feature_show(struct f2fs_attr *a,
> ATTR_LIST(lifetime_write_kbytes),
> ATTR_LIST(features),
> ATTR_LIST(reserved_blocks),
> + ATTR_LIST(current_reserved_blocks),
> NULL,
> };
>
>
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