Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751656AbeADGwA (ORCPT + 1 other); Thu, 4 Jan 2018 01:52:00 -0500 Received: from mail.kernel.org ([198.145.29.99]:56432 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750746AbeADGv7 (ORCPT ); Thu, 4 Jan 2018 01:51:59 -0500 DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 56DB821873 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=jaegeuk@kernel.org Date: Wed, 3 Jan 2018 22:51:58 -0800 From: Jaegeuk Kim To: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Subject: Re: [PATCH 2/2 v2] f2fs: add reserved blocks for root user Message-ID: <20180104065158.GB54234@jaegeuk-macbookpro.roam.corp.google.com> References: <20180103185845.29953-1-jaegeuk@kernel.org> <20180103185845.29953-2-jaegeuk@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180103185845.29953-2-jaegeuk@kernel.org> User-Agent: Mutt/1.8.2 (2017-04-18) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: This patch allows root to reserve some blocks via mount option. "-o reserve_root=N" means N x 4KB-sized blocks for root only. Signed-off-by: Jaegeuk Kim --- Change log from v1: - handle remount case to limit reserve_root=%u fs/f2fs/f2fs.h | 20 ++++++++++++++++---- fs/f2fs/super.c | 34 +++++++++++++++++++++++++++++++++- fs/f2fs/sysfs.c | 3 ++- 3 files changed, 51 insertions(+), 6 deletions(-) diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index a52de99a34b9..4d255aac49bb 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -95,6 +95,7 @@ extern char *fault_name[FAULT_MAX]; #define F2FS_MOUNT_PRJQUOTA 0x00200000 #define F2FS_MOUNT_QUOTA 0x00400000 #define F2FS_MOUNT_INLINE_XATTR_SIZE 0x00800000 +#define F2FS_MOUNT_RESERVE_ROOT 0x01000000 #define clear_opt(sbi, option) ((sbi)->mount_opt.opt &= ~F2FS_MOUNT_##option) #define set_opt(sbi, option) ((sbi)->mount_opt.opt |= F2FS_MOUNT_##option) @@ -1109,6 +1110,7 @@ struct f2fs_sb_info { block_t last_valid_block_count; /* for recovery */ block_t reserved_blocks; /* configurable reserved blocks */ block_t current_reserved_blocks; /* current reserved blocks */ + block_t root_reserved_blocks; /* root reserved blocks */ unsigned int nquota_files; /* # of quota sysfile */ @@ -1590,11 +1592,17 @@ static inline int inc_valid_block_count(struct f2fs_sb_info *sbi, sbi->total_valid_block_count += (block_t)(*count); avail_user_block_count = sbi->user_block_count - sbi->current_reserved_blocks; + + if (!(test_opt(sbi, RESERVE_ROOT) && capable(CAP_SYS_RESOURCE))) + avail_user_block_count -= sbi->root_reserved_blocks; + if (unlikely(sbi->total_valid_block_count > avail_user_block_count)) { diff = sbi->total_valid_block_count - avail_user_block_count; + if (diff > *count) + diff = *count; *count -= diff; release = diff; - sbi->total_valid_block_count = avail_user_block_count; + sbi->total_valid_block_count -= diff; if (!*count) { spin_unlock(&sbi->stat_lock); percpu_counter_sub(&sbi->alloc_valid_block_count, diff); @@ -1783,9 +1791,13 @@ 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->current_reserved_blocks > - sbi->user_block_count)) { + valid_block_count = sbi->total_valid_block_count + + sbi->current_reserved_blocks + 1; + + if (!(test_opt(sbi, RESERVE_ROOT) && capable(CAP_SYS_RESOURCE))) + valid_block_count += sbi->root_reserved_blocks; + + if (unlikely(valid_block_count > sbi->user_block_count)) { spin_unlock(&sbi->stat_lock); goto enospc; } diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index f1300cda6bfd..f828a3ea3c9a 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -107,6 +107,7 @@ enum { Opt_noextent_cache, Opt_noinline_data, Opt_data_flush, + Opt_reserve_root, Opt_mode, Opt_io_size_bits, Opt_fault_injection, @@ -157,6 +158,7 @@ static match_table_t f2fs_tokens = { {Opt_noextent_cache, "noextent_cache"}, {Opt_noinline_data, "noinline_data"}, {Opt_data_flush, "data_flush"}, + {Opt_reserve_root, "reserve_root=%u"}, {Opt_mode, "mode=%s"}, {Opt_io_size_bits, "io_bits=%u"}, {Opt_fault_injection, "fault_injection=%u"}, @@ -191,6 +193,19 @@ void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...) va_end(args); } +static inline void limit_reserve_root(struct f2fs_sb_info *sbi) +{ + block_t limit = (sbi->user_block_count << 1) / 1000; + + /* limit is 0.2% */ + if (test_opt(sbi, RESERVE_ROOT) && sbi->root_reserved_blocks > limit) { + sbi->root_reserved_blocks = limit; + f2fs_msg(sbi->sb, KERN_INFO, + "Reduce reserved blocks for root = %u", + sbi->root_reserved_blocks); + } +} + static void init_once(void *foo) { struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo; @@ -488,6 +503,18 @@ static int parse_options(struct super_block *sb, char *options) case Opt_data_flush: set_opt(sbi, DATA_FLUSH); break; + case Opt_reserve_root: + if (args->from && match_int(args, &arg)) + return -EINVAL; + if (test_opt(sbi, RESERVE_ROOT)) { + f2fs_msg(sb, KERN_INFO, + "Preserve previous reserve_root=%u", + sbi->root_reserved_blocks); + } else { + sbi->root_reserved_blocks = arg; + set_opt(sbi, RESERVE_ROOT); + } + break; case Opt_mode: name = match_strdup(&args[0]); @@ -1006,7 +1033,7 @@ 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) - sbi->current_reserved_blocks; - buf->f_bavail = buf->f_bfree; + buf->f_bavail = buf->f_bfree - sbi->root_reserved_blocks; avail_node_count = sbi->total_node_count - sbi->nquota_files - F2FS_RESERVED_NODE_NUM; @@ -1135,6 +1162,9 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root) else if (test_opt(sbi, LFS)) seq_puts(seq, "lfs"); seq_printf(seq, ",active_logs=%u", sbi->active_logs); + if (test_opt(sbi, RESERVE_ROOT)) + seq_printf(seq, ",reserve_root=%u", + sbi->root_reserved_blocks); if (F2FS_IO_SIZE_BITS(sbi)) seq_printf(seq, ",io_size=%uKB", F2FS_IO_SIZE_KB(sbi)); #ifdef CONFIG_F2FS_FAULT_INJECTION @@ -1333,6 +1363,7 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data) sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | (test_opt(sbi, POSIX_ACL) ? SB_POSIXACL : 0); + limit_reserve_root(sbi); return 0; restore_gc: if (need_restart_gc) { @@ -2569,6 +2600,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent) sbi->last_valid_block_count = sbi->total_valid_block_count; sbi->reserved_blocks = 0; sbi->current_reserved_blocks = 0; + limit_reserve_root(sbi); 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 7e15cbc5b8e1..41887e6ec1b3 100644 --- a/fs/f2fs/sysfs.c +++ b/fs/f2fs/sysfs.c @@ -162,7 +162,8 @@ static ssize_t f2fs_sbi_store(struct f2fs_attr *a, #endif if (a->struct_type == RESERVED_BLOCKS) { spin_lock(&sbi->stat_lock); - if (t > (unsigned long)sbi->user_block_count) { + if (t > (unsigned long)(sbi->user_block_count - + sbi->root_reserved_blocks)) { spin_unlock(&sbi->stat_lock); return -EINVAL; } -- 2.15.0.531.g2ccb3012c9-goog