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[209.132.180.67]) by mx.google.com with ESMTP id b6si3370504otj.275.2020.04.08.19.27.49; Wed, 08 Apr 2020 19:28:03 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=zq56M1ZT; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726552AbgDICZk (ORCPT + 99 others); Wed, 8 Apr 2020 22:25:40 -0400 Received: from mail.kernel.org ([198.145.29.99]:53200 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726521AbgDICZj (ORCPT ); Wed, 8 Apr 2020 22:25:39 -0400 Received: from localhost (unknown [104.132.1.66]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 98F9B20787; Thu, 9 Apr 2020 02:25:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586399138; bh=X52g9upDYdMaocYPdx7TVpNu9xO9I+UrvTFRy9XDodw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=zq56M1ZT8ShSAcEMFrjGeNOWYAUViHyohxfrBeHSNiCfou2VMqt8txngzfdjQ8/dm f35mxf1R6PB7Yo5xuVxUUcVu+3jW3kP8k2UmBzYFIlHjJNDPSE9eXy21Owkwi6EzMM b6OO0tCr9ZHUtPbMo8J0tQlvAfxR7uFnELVIrCSA= Date: Wed, 8 Apr 2020 19:25:38 -0700 From: Jaegeuk Kim To: Chao Yu Cc: Sahitya Tummala , linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Subject: Re: [f2fs-dev] [PATCH] f2fs: prevent meta updates while checkpoint is in progress Message-ID: <20200409022538.GB110440@google.com> References: <1585219019-24831-1-git-send-email-stummala@codeaurora.org> <20200331035419.GB79749@google.com> <20200331090608.GZ20234@codeaurora.org> <20200331184307.GA198665@google.com> <20200401050801.GA20234@codeaurora.org> <20200403171727.GB68460@google.com> <20200403172750.GD68460@google.com> <8ab6c209-8fbf-eadb-17cb-d96cc10f868d@huawei.com> <20200407025818.GA137081@google.com> <64926da7-05ba-c731-b425-1984cd394015@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <64926da7-05ba-c731-b425-1984cd394015@huawei.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/07, Chao Yu wrote: > On 2020/4/7 10:58, Jaegeuk Kim wrote: > > On 04/07, Chao Yu wrote: > >> On 2020/4/4 1:27, Jaegeuk Kim wrote: > >>> On 04/03, Jaegeuk Kim wrote: > >>>> On 04/01, Sahitya Tummala wrote: > >>>>> Hi Jaegeuk, > >>>>> > >>>>> Got it. > >>>>> The diff below looks good to me. > >>>>> Would you like me to test it and put a patch for this? > >>>> > >>>> Sahitya, Chao, > >>>> > >>>> Could you please take a look at this patch and test intensively? > >>>> > >>>> Thanks, > >>> > >>> v2: > >>> > >>> >From 6bf7d5b227d466b0fe90d4957af29bd184fb646e Mon Sep 17 00:00:00 2001 > >>> From: Jaegeuk Kim > >>> Date: Tue, 31 Mar 2020 11:43:07 -0700 > >>> Subject: [PATCH] f2fs: refactor resize_fs to avoid meta updates in progress > >>> > >>> Sahitya raised an issue: > >>> - prevent meta updates while checkpoint is in progress > >>> > >>> allocate_segment_for_resize() can cause metapage updates if > >>> it requires to change the current node/data segments for resizing. > >>> Stop these meta updates when there is a checkpoint already > >>> in progress to prevent inconsistent CP data. > >>> > >>> Signed-off-by: Sahitya Tummala > >>> Signed-off-by: Jaegeuk Kim > >>> --- > >>> fs/f2fs/checkpoint.c | 6 +- > >>> fs/f2fs/f2fs.h | 2 +- > >>> fs/f2fs/file.c | 5 +- > >>> fs/f2fs/gc.c | 107 +++++++++++++++++++----------------- > >>> fs/f2fs/super.c | 1 - > >>> include/trace/events/f2fs.h | 4 +- > >>> 6 files changed, 67 insertions(+), 58 deletions(-) > >>> > >>> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c > >>> index 852890b72d6ac..531995192b714 100644 > >>> --- a/fs/f2fs/checkpoint.c > >>> +++ b/fs/f2fs/checkpoint.c > >>> @@ -1553,7 +1553,8 @@ int f2fs_write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc) > >>> return 0; > >>> f2fs_warn(sbi, "Start checkpoint disabled!"); > >>> } > >>> - mutex_lock(&sbi->cp_mutex); > >>> + if (cpc->reason != CP_RESIZE) > >>> + mutex_lock(&sbi->cp_mutex); > >>> > >>> if (!is_sbi_flag_set(sbi, SBI_IS_DIRTY) && > >>> ((cpc->reason & CP_FASTBOOT) || (cpc->reason & CP_SYNC) || > >>> @@ -1622,7 +1623,8 @@ int f2fs_write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc) > >>> f2fs_update_time(sbi, CP_TIME); > >>> trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint"); > >>> out: > >>> - mutex_unlock(&sbi->cp_mutex); > >>> + if (cpc->reason != CP_RESIZE) > >>> + mutex_unlock(&sbi->cp_mutex); > >>> return err; > >>> } > >>> > >>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > >>> index be02a5cadd944..f9b2caa2135bd 100644 > >>> --- a/fs/f2fs/f2fs.h > >>> +++ b/fs/f2fs/f2fs.h > >>> @@ -193,6 +193,7 @@ enum { > >>> #define CP_DISCARD 0x00000010 > >>> #define CP_TRIMMED 0x00000020 > >>> #define CP_PAUSE 0x00000040 > >>> +#define CP_RESIZE 0x00000080 > >>> > >>> #define MAX_DISCARD_BLOCKS(sbi) BLKS_PER_SEC(sbi) > >>> #define DEF_MAX_DISCARD_REQUEST 8 /* issue 8 discards per round */ > >>> @@ -1421,7 +1422,6 @@ struct f2fs_sb_info { > >>> unsigned int segs_per_sec; /* segments per section */ > >>> unsigned int secs_per_zone; /* sections per zone */ > >>> unsigned int total_sections; /* total section count */ > >>> - struct mutex resize_mutex; /* for resize exclusion */ > >>> unsigned int total_node_count; /* total node block count */ > >>> unsigned int total_valid_node_count; /* valid node block count */ > >>> loff_t max_file_blocks; /* max block index of file */ > >>> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c > >>> index 257e61d0afffb..b4c12370bb3d6 100644 > >>> --- a/fs/f2fs/file.c > >>> +++ b/fs/f2fs/file.c > >>> @@ -3305,7 +3305,6 @@ static int f2fs_ioc_resize_fs(struct file *filp, unsigned long arg) > >>> { > >>> struct f2fs_sb_info *sbi = F2FS_I_SB(file_inode(filp)); > >>> __u64 block_count; > >>> - int ret; > >>> > >>> if (!capable(CAP_SYS_ADMIN)) > >>> return -EPERM; > >>> @@ -3317,9 +3316,7 @@ static int f2fs_ioc_resize_fs(struct file *filp, unsigned long arg) > >>> sizeof(block_count))) > >>> return -EFAULT; > >>> > >>> - ret = f2fs_resize_fs(sbi, block_count); > >>> - > >>> - return ret; > >>> + return f2fs_resize_fs(sbi, block_count); > >>> } > >>> > >>> static int f2fs_ioc_enable_verity(struct file *filp, unsigned long arg) > >>> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c > >>> index 26248c8936db0..46c75ecb64a2e 100644 > >>> --- a/fs/f2fs/gc.c > >>> +++ b/fs/f2fs/gc.c > >>> @@ -1399,12 +1399,29 @@ void f2fs_build_gc_manager(struct f2fs_sb_info *sbi) > >>> GET_SEGNO(sbi, FDEV(0).end_blk) + 1; > >>> } > >>> > >>> -static int free_segment_range(struct f2fs_sb_info *sbi, unsigned int start, > >>> - unsigned int end) > >>> +static int free_segment_range(struct f2fs_sb_info *sbi, > >>> + unsigned int secs, bool gc_only) > >>> { > >>> - int type; > >>> - unsigned int segno, next_inuse; > >>> + unsigned int segno, next_inuse, start, end; > >>> + struct cp_control cpc = { CP_RESIZE, 0, 0, 0 }; > >>> + int gc_mode, gc_type; > >>> int err = 0; > >>> + int type; > >>> + > >>> + /* Force block allocation for GC */ > >>> + MAIN_SECS(sbi) -= secs; > >>> + start = MAIN_SECS(sbi) * sbi->segs_per_sec; > >>> + end = MAIN_SEGS(sbi) - 1; > >>> + > >>> + mutex_lock(&DIRTY_I(sbi)->seglist_lock); > >>> + for (gc_mode = 0; gc_mode < MAX_GC_POLICY; gc_mode++) > >>> + if (SIT_I(sbi)->last_victim[gc_mode] >= start) > >>> + SIT_I(sbi)->last_victim[gc_mode] = 0; > >>> + > >>> + for (gc_type = BG_GC; gc_type <= FG_GC; gc_type++) > >>> + if (sbi->next_victim_seg[gc_type] >= start) > >>> + sbi->next_victim_seg[gc_type] = NULL_SEGNO; > >>> + mutex_unlock(&DIRTY_I(sbi)->seglist_lock); > >>> > >>> /* Move out cursegs from the target range */ > >>> for (type = CURSEG_HOT_DATA; type < NR_CURSEG_TYPE; type++) > >>> @@ -1417,18 +1434,20 @@ static int free_segment_range(struct f2fs_sb_info *sbi, unsigned int start, > >>> .iroot = RADIX_TREE_INIT(gc_list.iroot, GFP_NOFS), > >>> }; > >>> > >>> - down_write(&sbi->gc_lock); > >>> do_garbage_collect(sbi, segno, &gc_list, FG_GC); > >>> - up_write(&sbi->gc_lock); > >>> put_gc_inode(&gc_list); > >>> > >>> - if (get_valid_blocks(sbi, segno, true)) > >>> - return -EAGAIN; > >>> + if (!gc_only && get_valid_blocks(sbi, segno, true)) { > >>> + err = -EAGAIN; > >>> + goto out; > >>> + } > >>> } > >>> + if (gc_only) > >>> + goto out; > >>> > >>> - err = f2fs_sync_fs(sbi->sb, 1); > >>> + err = f2fs_write_checkpoint(sbi, &cpc); > >>> if (err) > >>> - return err; > >>> + goto out; > >>> > >>> next_inuse = find_next_inuse(FREE_I(sbi), end + 1, start); > >>> if (next_inuse <= end) { > >>> @@ -1436,6 +1455,8 @@ static int free_segment_range(struct f2fs_sb_info *sbi, unsigned int start, > >>> next_inuse); > >>> f2fs_bug_on(sbi, 1); > >>> } > >>> +out: > >>> + MAIN_SECS(sbi) -= secs; > >>> return err; > >>> } > >>> > >>> @@ -1481,6 +1502,7 @@ static void update_fs_metadata(struct f2fs_sb_info *sbi, int secs) > >>> > >>> SM_I(sbi)->segment_count = (int)SM_I(sbi)->segment_count + segs; > >>> MAIN_SEGS(sbi) = (int)MAIN_SEGS(sbi) + segs; > >>> + MAIN_SECS(sbi) += secs; > >>> FREE_I(sbi)->free_sections = (int)FREE_I(sbi)->free_sections + secs; > >>> FREE_I(sbi)->free_segments = (int)FREE_I(sbi)->free_segments + segs; > >>> F2FS_CKPT(sbi)->user_block_count = cpu_to_le64(user_block_count + blks); > >>> @@ -1502,8 +1524,8 @@ static void update_fs_metadata(struct f2fs_sb_info *sbi, int secs) > >>> int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count) > >>> { > >>> __u64 old_block_count, shrunk_blocks; > >>> + struct cp_control cpc = { CP_RESIZE, 0, 0, 0 }; > >>> unsigned int secs; > >>> - int gc_mode, gc_type; > >>> int err = 0; > >>> __u32 rem; > >>> > >>> @@ -1538,10 +1560,22 @@ int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count) > >>> return -EINVAL; > >>> } > >>> > >>> - freeze_bdev(sbi->sb->s_bdev); > >>> - > >>> shrunk_blocks = old_block_count - block_count; > >>> secs = div_u64(shrunk_blocks, BLKS_PER_SEC(sbi)); > >>> + > >>> + /* protect MAIN_SEC in free_segment_range */ > >>> + f2fs_lock_op(sbi); > >>> + err = free_segment_range(sbi, secs, true); > >> > >> For this path, we break the rule that we need hold gc_lock during > >> do_garbage_collect(). > > > > I don't get the point. > > In free_segment_range(), gc_lock is held before/after do_garbage_collect(). > > @@ -1417,18 +1434,20 @@ static int free_segment_range(struct f2fs_sb_info *sbi, unsigned int start, > .iroot = RADIX_TREE_INIT(gc_list.iroot, GFP_NOFS), > }; > > - down_write(&sbi->gc_lock); > do_garbage_collect(sbi, segno, &gc_list, FG_GC); > - up_write(&sbi->gc_lock); > put_gc_inode(&gc_list); > > They were removed, right? Ah, I messed up the patches. Yes, it seems I removed it. > > > > >> > >> One other concern is that still the granularity of lock_op is too large, > >> to avoid potential hang if it triggers heavy gc migration, how about using > >> a timeout mechanism in free_segment_range() like we did in > >> f2fs_disable_checkpoint()? > > > > We can do first round GC without f2fs_lock_op(). > > Yup, that makes sense to me. > > > > >> > >>> + f2fs_unlock_op(sbi); > >>> + if (err) > >>> + return err; > >>> + > >>> + set_sbi_flag(sbi, SBI_IS_RESIZEFS); > >>> + > >>> + freeze_super(sbi->sb); > >>> + down_write(&sbi->gc_lock); > >>> + mutex_lock(&sbi->cp_mutex); > >>> + > >>> spin_lock(&sbi->stat_lock); > >>> if (shrunk_blocks + valid_user_blocks(sbi) + > >>> sbi->current_reserved_blocks + sbi->unusable_block_count + > >>> @@ -1550,69 +1584,44 @@ int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count) > >>> else > >>> sbi->user_block_count -= shrunk_blocks; > >>> spin_unlock(&sbi->stat_lock); > >>> - if (err) { > >>> - thaw_bdev(sbi->sb->s_bdev, sbi->sb); > >>> - return err; > >>> - } > >>> - > >>> - mutex_lock(&sbi->resize_mutex); > >>> - set_sbi_flag(sbi, SBI_IS_RESIZEFS); > >>> - > >>> - mutex_lock(&DIRTY_I(sbi)->seglist_lock); > >>> - > >>> - MAIN_SECS(sbi) -= secs; > >>> - > >>> - for (gc_mode = 0; gc_mode < MAX_GC_POLICY; gc_mode++) > >>> - if (SIT_I(sbi)->last_victim[gc_mode] >= > >>> - MAIN_SECS(sbi) * sbi->segs_per_sec) > >>> - SIT_I(sbi)->last_victim[gc_mode] = 0; > >>> - > >>> - for (gc_type = BG_GC; gc_type <= FG_GC; gc_type++) > >>> - if (sbi->next_victim_seg[gc_type] >= > >>> - MAIN_SECS(sbi) * sbi->segs_per_sec) > >>> - sbi->next_victim_seg[gc_type] = NULL_SEGNO; > >>> - > >>> - mutex_unlock(&DIRTY_I(sbi)->seglist_lock); > >>> + if (err) > >>> + goto out_err; > >>> > >>> - err = free_segment_range(sbi, MAIN_SECS(sbi) * sbi->segs_per_sec, > >>> - MAIN_SEGS(sbi) - 1); > >>> + err = free_segment_range(sbi, secs, false); > >> > >> Lock coverage is still large here, what about just checking the resize condition > >> with find_next_inuse(, end + 1, start), if the migration finished, then let's call > >> write_checkpoint(), otherwise, returning -EAGAIN. > > > > We did GC above, so how much time do you expect to complete here? Basically > > Just to consider handling corner case here, which is in between round 1 and round 2 > GC, there may occur a fair mount of data writes locating in the tail of device. > > > I hesitate to return EAGAIN, since there's no context with respect to how > > many times user need to retry to get succeess. Disabling checkpoint has > > I think user can accept EAGAIN if we describe clearly about that the interface > may fail due to concurrent IO on device, if the administrator want to resize > successfully, concurrent operation on device should be avoided. > > > some ways to get a sense tho. Nevertheless, if we want to return EAGAIN, > > it'd be better to give # of bytes that it requires to migrate further? > > Hmm.. I don't think there is such number, as resize should be atomic. I thought we can return roughly # of dirty segments? > > Thanks, > > > > >> > >>> if (err) > >>> - goto out; > >>> + goto recover_out; > >>> > >>> update_sb_metadata(sbi, -secs); > >>> > >>> err = f2fs_commit_super(sbi, false); > >>> if (err) { > >>> update_sb_metadata(sbi, secs); > >>> - goto out; > >>> + goto recover_out; > >>> } > >>> > >>> - mutex_lock(&sbi->cp_mutex); > >>> update_fs_metadata(sbi, -secs); > >>> clear_sbi_flag(sbi, SBI_IS_RESIZEFS); > >>> set_sbi_flag(sbi, SBI_IS_DIRTY); > >>> - mutex_unlock(&sbi->cp_mutex); > >>> > >>> - err = f2fs_sync_fs(sbi->sb, 1); > >>> + err = f2fs_write_checkpoint(sbi, &cpc); > >>> if (err) { > >>> - mutex_lock(&sbi->cp_mutex); > >>> update_fs_metadata(sbi, secs); > >>> - mutex_unlock(&sbi->cp_mutex); > >>> update_sb_metadata(sbi, secs); > >>> f2fs_commit_super(sbi, false); > >>> } > >>> -out: > >>> +recover_out: > >>> if (err) { > >>> set_sbi_flag(sbi, SBI_NEED_FSCK); > >>> f2fs_err(sbi, "resize_fs failed, should run fsck to repair!"); > >>> > >>> - MAIN_SECS(sbi) += secs; > >>> spin_lock(&sbi->stat_lock); > >>> sbi->user_block_count += shrunk_blocks; > >>> spin_unlock(&sbi->stat_lock); > >>> } > >>> +out_err: > >>> + mutex_unlock(&sbi->cp_mutex); > >>> + up_write(&sbi->gc_lock); > >>> + thaw_super(sbi->sb); > >>> clear_sbi_flag(sbi, SBI_IS_RESIZEFS); > >>> - mutex_unlock(&sbi->resize_mutex); > >>> - thaw_bdev(sbi->sb->s_bdev, sbi->sb); > >>> return err; > >>> } > >>> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c > >>> index b83b17b54a0a6..1e7b1d21d0177 100644 > >>> --- a/fs/f2fs/super.c > >>> +++ b/fs/f2fs/super.c > >>> @@ -3412,7 +3412,6 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent) > >>> init_rwsem(&sbi->gc_lock); > >>> mutex_init(&sbi->writepages); > >>> mutex_init(&sbi->cp_mutex); > >>> - mutex_init(&sbi->resize_mutex); > >>> init_rwsem(&sbi->node_write); > >>> init_rwsem(&sbi->node_change); > >>> > >>> diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h > >>> index 4d7d4c391879d..5d1a72001fdb4 100644 > >>> --- a/include/trace/events/f2fs.h > >>> +++ b/include/trace/events/f2fs.h > >>> @@ -50,6 +50,7 @@ TRACE_DEFINE_ENUM(CP_RECOVERY); > >>> TRACE_DEFINE_ENUM(CP_DISCARD); > >>> TRACE_DEFINE_ENUM(CP_TRIMMED); > >>> TRACE_DEFINE_ENUM(CP_PAUSE); > >>> +TRACE_DEFINE_ENUM(CP_RESIZE); > >>> > >>> #define show_block_type(type) \ > >>> __print_symbolic(type, \ > >>> @@ -126,7 +127,8 @@ TRACE_DEFINE_ENUM(CP_PAUSE); > >>> { CP_RECOVERY, "Recovery" }, \ > >>> { CP_DISCARD, "Discard" }, \ > >>> { CP_PAUSE, "Pause" }, \ > >>> - { CP_TRIMMED, "Trimmed" }) > >>> + { CP_TRIMMED, "Trimmed" }, \ > >>> + { CP_RESIZE, "Resize" }) > >>> > >>> #define show_fsync_cpreason(type) \ > >>> __print_symbolic(type, \ > >>> > > . > >