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s=k20201202; t=1635838570; bh=E0ffIejdumv1RC0pKbIxm0RZVYMo3MKph+prxcwMGlU=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=MBqM7NOGsv5CRd9fXjWUpiLJyBboJX6EhA5ls6iSoQFlruMVWgONtIO52dMnDunlD 5f70COA/MArLTyI1XBEScaKSYzHIjyv6gcyO3bB1lrVbfvI9LwqoaWw1Fvi+/DKw3E XAUh90H//Wl9REfS/aKRH2OQiwHn/IhSYyQTuZ8k7mlS366fiTq3Lidrbmu4qro9nS 2Q94oHzTXQpVuYCsdWQsdf3N/Lcit73nGOpbsG11GDXVy9SXGnPsHUERWNxd4Je8Nw U5D8ECrCc4testNtX0Z9rlbNLmJS00wRlBCe1uyzS2WtReNGTIQt8f0oIa6UM5NL0E OLYsf31jectiw== Message-ID: <037676b3-4f66-c749-5c8b-ac0c1ef7facf@kernel.org> Date: Tue, 2 Nov 2021 15:36:07 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.2.1 Content-Language: en-US To: Hyeong-Jun Kim , Jaegeuk Kim References: <20211102071002.71823-1-hj514.kim@samsung.com> From: Chao Yu In-Reply-To: <20211102071002.71823-1-hj514.kim@samsung.com> X-Headers-End: 1mhoLA-0003PY-3a Subject: Re: [f2fs-dev] [PATCH v4] F2FS: invalidate META_MAPPING before IPU/DIO write 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-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net On 2021/11/2 15:10, Hyeong-Jun Kim wrote: > Encrypted pages during GC are read and cached in META_MAPPING. > However, due to cached pages in META_MAPPING, there is an issue where > newly written pages are lost by IPU or DIO writes. > > Thread A - f2fs_gc() Thread B > /* phase 3 */ > down_write(i_gc_rwsem) > ra_data_block() ---- (a) > up_write(i_gc_rwsem) > f2fs_direct_IO() : > - down_read(i_gc_rwsem) > - __blockdev_direct_io() > - get_data_block_dio_write() > - f2fs_dio_submit_bio() ---- (b) > - up_read(i_gc_rwsem) > /* phase 4 */ > down_write(i_gc_rwsem) > move_data_block() ---- (c) > up_write(i_gc_rwsem) > > (a) In phase 3 of f2fs_gc(), up-to-date page is read from storage and > cached in META_MAPPING. > (b) In thread B, writing new data by IPU or DIO write on same blkaddr as > read in (a). cached page in META_MAPPING become out-dated. > (c) In phase 4 of f2fs_gc(), out-dated page in META_MAPPING is copied to > new blkaddr. In conclusion, the newly written data in (b) is lost. > > To address this issue, invalidating pages in META_MAPPING before IPU or > DIO write. > > Fixes: 6aa58d8ad20a ("f2fs: readahead encrypted block during GC") > Signed-off-by: Hyeong-Jun Kim Reviewed-by: Chao Yu Thanks, _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel