Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751354AbeACS7E (ORCPT + 1 other); Wed, 3 Jan 2018 13:59:04 -0500 Received: from mail.kernel.org ([198.145.29.99]:43490 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751121AbeACS6s (ORCPT ); Wed, 3 Jan 2018 13:58:48 -0500 DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C0BA62188B 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 From: Jaegeuk Kim To: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Cc: Jaegeuk Kim Subject: [PATCH 2/2] f2fs: add reserved blocks for root user Date: Wed, 3 Jan 2018 10:58:45 -0800 Message-Id: <20180103185845.29953-2-jaegeuk@kernel.org> X-Mailer: git-send-email 2.15.0.531.g2ccb3012c9-goog In-Reply-To: <20180103185845.29953-1-jaegeuk@kernel.org> References: <20180103185845.29953-1-jaegeuk@kernel.org> 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 --- fs/f2fs/f2fs.h | 26 ++++++++++++++++++++++---- fs/f2fs/super.c | 29 ++++++++++++++++++++++++++--- fs/f2fs/sysfs.c | 3 ++- 3 files changed, 50 insertions(+), 8 deletions(-) diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 369607b1e776..fb98b51f7376 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 */ @@ -1561,6 +1563,12 @@ static inline bool f2fs_has_xattr_block(unsigned int ofs) return ofs == XATTR_NODE_OFFSET; } +static inline block_t reserve_root_limit(struct f2fs_sb_info *sbi) +{ + /* limit is 0.2% */ + return (sbi->user_block_count << 1) / 1000; +} + static inline void f2fs_i_blocks_write(struct inode *, block_t, bool, bool); static inline int inc_valid_block_count(struct f2fs_sb_info *sbi, struct inode *inode, blkcnt_t *count) @@ -1590,11 +1598,17 @@ 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 +1797,13 @@ 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 4c1c99cf54ef..56b3caeec1ea 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"}, @@ -488,6 +490,18 @@ 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]); @@ -994,20 +1008,19 @@ static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf) struct super_block *sb = dentry->d_sb; struct f2fs_sb_info *sbi = F2FS_SB(sb); u64 id = huge_encode_dev(sb->s_bdev->bd_dev); - block_t total_count, user_block_count, start_count, ovp_count; + block_t total_count, user_block_count, start_count; u64 avail_node_count; total_count = le64_to_cpu(sbi->raw_super->block_count); user_block_count = sbi->user_block_count; start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr); - ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg; buf->f_type = F2FS_SUPER_MAGIC; buf->f_bsize = sbi->blocksize; 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; @@ -1136,6 +1149,9 @@ 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 @@ -2571,6 +2587,13 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent) sbi->reserved_blocks = 0; sbi->current_reserved_blocks = 0; + if (test_opt(sbi, RESERVE_ROOT) && + sbi->root_reserved_blocks > reserve_root_limit(sbi)) { + sbi->root_reserved_blocks = reserve_root_limit(sbi); + f2fs_msg(sb, KERN_INFO, + "Reduce reserved blocks for root = %u", + sbi->root_reserved_blocks); + } for (i = 0; i < NR_INODE_TYPE; i++) { INIT_LIST_HEAD(&sbi->inode_list[i]); spin_lock_init(&sbi->inode_lock[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