Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753329AbdHKLoJ (ORCPT ); Fri, 11 Aug 2017 07:44:09 -0400 Received: from szxga05-in.huawei.com ([45.249.212.191]:3069 "EHLO szxga05-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752903AbdHKLoH (ORCPT ); Fri, 11 Aug 2017 07:44:07 -0400 From: Yunlong Song To: , , , , CC: , , , , Subject: [PATCH v2] f2fs: introduce cur_reserved_blocks in sysfs Date: Fri, 11 Aug 2017 19:43:46 +0800 Message-ID: <1502451826-45453-1-git-send-email-yunlong.song@huawei.com> X-Mailer: git-send-email 1.8.5.2 In-Reply-To: <1502199825-15218-1-git-send-email-yunlong.song@huawei.com> References: <1502199825-15218-1-git-send-email-yunlong.song@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.107.193.250] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020202.598D9885.0006,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2014-11-16 11:51:01, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 4995fd1e1b56198163d3858c2f0624c7 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6019 Lines: 154 In this patch, we add a new sysfs interface, we can use it to gradually achieve the reserved_blocks finally, even when reserved_blocks is initially set over user_block_count - total_valid_block_count. This is very useful, especially when we upgrade kernel with new reserved_blocks value, but old disk image unluckily has user_block_count - total_valid_block_count smaller than the desired reserved_blocks. With this patch, f2fs can try its best to reserve space and get close to the reserved_blocks, and the current value of achieved reserved_blocks can be shown in real time. To ensure there is enough space for supporting system's activation, we safely increase cur_reserved_blocks in dev_valid_block(,node)_count to only take up the blocks which are just obsoleted. Signed-off-by: Yunlong Song --- Documentation/ABI/testing/sysfs-fs-f2fs | 6 ++++++ fs/f2fs/f2fs.h | 9 +++++++-- fs/f2fs/super.c | 3 ++- fs/f2fs/sysfs.c | 15 ++++++++++----- 4 files changed, 25 insertions(+), 8 deletions(-) diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs index 11b7f4e..bdbb9f3 100644 --- a/Documentation/ABI/testing/sysfs-fs-f2fs +++ b/Documentation/ABI/testing/sysfs-fs-f2fs @@ -151,3 +151,9 @@ Date: August 2017 Contact: "Jaegeuk Kim" Description: Controls sleep time of GC urgent mode + +What: /sys/fs/f2fs//cur_reserved_blocks +Date: August 2017 +Contact: "Yunlong Song" +Description: + Shows current reserved blocks in system. diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 2f20b6b..62d7343 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -1041,6 +1041,7 @@ 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 cur_reserved_blocks; /* current reserved blocks */ u32 s_next_generation; /* for NFS support */ @@ -1515,7 +1516,7 @@ 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->cur_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; @@ -1549,6 +1550,8 @@ 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; + sbi->cur_reserved_blocks = min(sbi->reserved_blocks, + sbi->cur_reserved_blocks + count); spin_unlock(&sbi->stat_lock); f2fs_i_blocks_write(inode, count, false, true); } @@ -1695,7 +1698,7 @@ 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->cur_reserved_blocks > sbi->user_block_count)) { spin_unlock(&sbi->stat_lock); goto enospc; @@ -1738,6 +1741,8 @@ static inline void dec_valid_node_count(struct f2fs_sb_info *sbi, sbi->total_valid_node_count--; sbi->total_valid_block_count--; + sbi->cur_reserved_blocks = min(sbi->reserved_blocks, + sbi->cur_reserved_blocks + 1); spin_unlock(&sbi->stat_lock); diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 4c1bdcb..16a805f 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -957,7 +957,7 @@ 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->cur_reserved_blocks; avail_node_count = sbi->total_node_count - F2FS_RESERVED_NODE_NUM; @@ -2411,6 +2411,7 @@ 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->cur_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 a1be5ac..03f9d3d 100644 --- a/fs/f2fs/sysfs.c +++ b/fs/f2fs/sysfs.c @@ -76,6 +76,12 @@ static ssize_t lifetime_write_kbytes_show(struct f2fs_attr *a, BD_PART_WRITTEN(sbi))); } +static ssize_t cur_reserved_blocks_show(struct f2fs_attr *a, + struct f2fs_sb_info *sbi, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%u\n", sbi->cur_reserved_blocks); +} + static ssize_t features_show(struct f2fs_attr *a, struct f2fs_sb_info *sbi, char *buf) { @@ -143,12 +149,9 @@ 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) { - spin_unlock(&sbi->stat_lock); - return -EINVAL; - } *ui = t; + if (t < sbi->cur_reserved_blocks) + sbi->cur_reserved_blocks = t; spin_unlock(&sbi->stat_lock); return count; } @@ -274,6 +277,7 @@ static ssize_t f2fs_feature_show(struct f2fs_attr *a, #endif F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes); F2FS_GENERAL_RO_ATTR(features); +F2FS_GENERAL_RO_ATTR(cur_reserved_blocks); #ifdef CONFIG_F2FS_FS_ENCRYPTION F2FS_FEATURE_RO_ATTR(encryption, FEAT_CRYPTO); @@ -317,6 +321,7 @@ static ssize_t f2fs_feature_show(struct f2fs_attr *a, ATTR_LIST(lifetime_write_kbytes), ATTR_LIST(features), ATTR_LIST(reserved_blocks), + ATTR_LIST(cur_reserved_blocks), NULL, }; -- 1.8.5.2