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Sat, 20 Jun 2020 00:52:25 +0000 Received: from DGGEMS410-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id CAA08E38597AAB6356D1; Sat, 20 Jun 2020 08:52:15 +0800 (CST) Received: from [10.134.22.195] (10.134.22.195) by smtp.huawei.com (10.3.19.210) with Microsoft SMTP Server (TLS) id 14.3.487.0; Sat, 20 Jun 2020 08:52:10 +0800 To: Jaegeuk Kim References: <20200618063625.110273-1-yuchao0@huawei.com> <20200618235932.GA227771@google.com> <20200619054922.GC227771@google.com> <3634ef79-5903-449d-0d52-3d5566481863@huawei.com> <20200619224755.GA60059@google.com> From: Chao Yu Message-ID: <3f49539a-7be1-be90-d13a-2f66a8483458@huawei.com> Date: Sat, 20 Jun 2020 08:52:09 +0800 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20200619224755.GA60059@google.com> Content-Language: en-US X-Originating-IP: [10.134.22.195] X-CFilter-Loop: Reflected X-Headers-End: 1jmRk6-00CYPH-It Subject: Re: [f2fs-dev] [PATCH 1/5] f2fs: fix to wait page writeback before update X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net On 2020/6/20 6:47, Jaegeuk Kim wrote: > On 06/19, Chao Yu wrote: >> On 2020/6/19 13:49, Jaegeuk Kim wrote: >>> On 06/19, Chao Yu wrote: >>>> Hi Jaegeuk, >>>> >>>> On 2020/6/19 7:59, Jaegeuk Kim wrote: >>>>> Hi Chao, >>>>> >>>>> On 06/18, Chao Yu wrote: >>>>>> to make page content stable for special device like raid. >>>>> >>>>> Could you elaborate the problem a bit? >>>> >>>> Some devices like raid5 wants page content to be stable, because >>>> it will calculate parity info based page content, if page is not >>>> stable, parity info could be corrupted, result in data inconsistency >>>> in stripe. >>> >>> I don't get the point, since those pages are brand new pages which were not >>> modified before. If it's on writeback, we should not modify them regardless >>> of whatever raid configuration. For example, f2fs_new_node_page() waits for >>> writeback. Am I missing something? >> >> I think we should use f2fs_bug_on(, PageWriteback()) rather than >> f2fs_wait_on_page_writeback() for brand new page which is allocated just now. >> For other paths, we can keep rule that waiting for writeback before updating. >> >> How do you think? >> >> Thanks, >> >>> >>>> >>>> Thanks, >>>> >>>>> >>>>>> >>>>>> Signed-off-by: Chao Yu >>>>>> --- >>>>>> fs/f2fs/dir.c | 2 ++ >>>>>> fs/f2fs/extent_cache.c | 18 +++++++++--------- >>>>>> fs/f2fs/f2fs.h | 2 +- >>>>>> fs/f2fs/file.c | 1 + >>>>>> fs/f2fs/inline.c | 2 ++ >>>>>> fs/f2fs/inode.c | 3 +-- >>>>>> 6 files changed, 16 insertions(+), 12 deletions(-) >>>>>> >>>>>> diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c >>>>>> index d35976785e8c..91e86747a604 100644 >>>>>> --- a/fs/f2fs/dir.c >>>>>> +++ b/fs/f2fs/dir.c >>>>>> @@ -495,6 +495,8 @@ static int make_empty_dir(struct inode *inode, >>>>>> if (IS_ERR(dentry_page)) >>>>>> return PTR_ERR(dentry_page); >>>>>> >>>>>> + f2fs_bug_on(F2FS_I_SB(inode), PageWriteback(dentry_page)); >>>>>> + >>>>>> dentry_blk = page_address(dentry_page); >>>>>> >>>>>> make_dentry_ptr_block(NULL, &d, dentry_blk); >>>>>> diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c >>>>>> index e60078460ad1..686c68b98610 100644 >>>>>> --- a/fs/f2fs/extent_cache.c >>>>>> +++ b/fs/f2fs/extent_cache.c >>>>>> @@ -325,9 +325,10 @@ static void __drop_largest_extent(struct extent_tree *et, >>>>>> } >>>>>> >>>>>> /* return true, if inode page is changed */ >>>>>> -static bool __f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent *i_ext) >>>>>> +static void __f2fs_init_extent_tree(struct inode *inode, struct page *ipage) >>>>>> { >>>>>> struct f2fs_sb_info *sbi = F2FS_I_SB(inode); >>>>>> + struct f2fs_extent *i_ext = ipage ? &F2FS_INODE(ipage)->i_ext : NULL; >>>>>> struct extent_tree *et; >>>>>> struct extent_node *en; >>>>>> struct extent_info ei; >>>>>> @@ -335,16 +336,18 @@ static bool __f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent *i_e >>>>>> if (!f2fs_may_extent_tree(inode)) { >>>>>> /* drop largest extent */ >>>>>> if (i_ext && i_ext->len) { >>>>>> + f2fs_wait_on_page_writeback(ipage, NODE, true, true); >>>>>> i_ext->len = 0; >>>>>> - return true; >>>>>> + set_page_dirty(ipage); >>>>>> + return; >>>>>> } >>>>>> - return false; >>>>>> + return; >>>>>> } >>>>>> >>>>>> et = __grab_extent_tree(inode); >>>>>> >>>>>> if (!i_ext || !i_ext->len) >>>>>> - return false; >>>>>> + return; >>>>>> >>>>>> get_extent_info(&ei, i_ext); >>>>>> >>>>>> @@ -360,17 +363,14 @@ static bool __f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent *i_e >>>>>> } >>>>>> out: >>>>>> write_unlock(&et->lock); >>>>>> - return false; >>>>>> } >>>>>> >>>>>> -bool f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent *i_ext) >>>>>> +void f2fs_init_extent_tree(struct inode *inode, struct page *ipage) >>>>>> { >>>>>> - bool ret = __f2fs_init_extent_tree(inode, i_ext); >>>>>> + __f2fs_init_extent_tree(inode, ipage); >>>>>> >>>>>> if (!F2FS_I(inode)->extent_tree) >>>>>> set_inode_flag(inode, FI_NO_EXTENT); >>>>>> - >>>>>> - return ret; >>>>>> } >>>>>> >>>>>> static bool f2fs_lookup_extent_tree(struct inode *inode, pgoff_t pgofs, >>>>>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h >>>>>> index b35a50f4953c..326c12fa0da5 100644 >>>>>> --- a/fs/f2fs/f2fs.h >>>>>> +++ b/fs/f2fs/f2fs.h >>>>>> @@ -3795,7 +3795,7 @@ struct rb_entry *f2fs_lookup_rb_tree_ret(struct rb_root_cached *root, >>>>>> bool f2fs_check_rb_tree_consistence(struct f2fs_sb_info *sbi, >>>>>> struct rb_root_cached *root); >>>>>> unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink); >>>>>> -bool f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent *i_ext); >>>>>> +void f2fs_init_extent_tree(struct inode *inode, struct page *ipage); >>>>>> void f2fs_drop_extent_tree(struct inode *inode); >>>>>> unsigned int f2fs_destroy_extent_node(struct inode *inode); >>>>>> void f2fs_destroy_extent_tree(struct inode *inode); >>>>>> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c >>>>>> index 3268f8dd59bb..1862073b96d2 100644 >>>>>> --- a/fs/f2fs/file.c >>>>>> +++ b/fs/f2fs/file.c >>>>>> @@ -1250,6 +1250,7 @@ static int __clone_blkaddrs(struct inode *src_inode, struct inode *dst_inode, >>>>>> f2fs_put_page(psrc, 1); >>>>>> return PTR_ERR(pdst); >>>>>> } >>>>>> + f2fs_wait_on_page_writeback(pdst, DATA, true, true); > > Do you mean pdst can be under writeback? Use f2fs_bug_on(, dirty || writeback) here? > >>>>>> f2fs_copy_page(psrc, pdst); >>>>>> set_page_dirty(pdst); >>>>>> f2fs_put_page(pdst, 1); >>>>>> diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c >>>>>> index dbade310dc79..4bcbc486c9e2 100644 >>>>>> --- a/fs/f2fs/inline.c >>>>>> +++ b/fs/f2fs/inline.c >>>>>> @@ -340,6 +340,8 @@ int f2fs_make_empty_inline_dir(struct inode *inode, struct inode *parent, >>>>>> struct f2fs_dentry_ptr d; >>>>>> void *inline_dentry; >>>>>> >>>>>> + f2fs_wait_on_page_writeback(ipage, NODE, true, true); f2fs_bug_on(, writeback)? Thanks, >>>>>> + >>>>>> inline_dentry = inline_data_addr(inode, ipage); >>>>>> >>>>>> make_dentry_ptr_inline(inode, &d, inline_dentry); >>>>>> diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c >>>>>> index 44582a4db513..7c156eb26dd7 100644 >>>>>> --- a/fs/f2fs/inode.c >>>>>> +++ b/fs/f2fs/inode.c >>>>>> @@ -367,8 +367,7 @@ static int do_read_inode(struct inode *inode) >>>>>> fi->i_pino = le32_to_cpu(ri->i_pino); >>>>>> fi->i_dir_level = ri->i_dir_level; >>>>>> >>>>>> - if (f2fs_init_extent_tree(inode, &ri->i_ext)) >>>>>> - set_page_dirty(node_page); >>>>>> + f2fs_init_extent_tree(inode, node_page); >>>>>> >>>>>> get_inline_info(inode, ri); >>>>>> >>>>>> -- >>>>>> 2.18.0.rc1 >>>>> . >>>>> >>> . >>> > . > _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel