From: Richard Weinberger <richard@nod.at> To: chengzhihao1 <chengzhihao1@huawei.com> Cc: Miquel Raynal <miquel.raynal@bootlin.com>, Vignesh Raghavendra <vigneshr@ti.com>, mcoquelin stm32 <mcoquelin.stm32@gmail.com>, kirill shutemov <kirill.shutemov@linux.intel.com>, Sascha Hauer <s.hauer@pengutronix.de>, linux-mtd <linux-mtd@lists.infradead.org>, linux-kernel <linux-kernel@vger.kernel.org> Subject: Re: [PATCH v6 12/15] ubi: fastmap: Add all fastmap pebs into 'ai->fastmap' when fm->used_blocks>=2 Date: Tue, 11 Jan 2022 14:56:22 +0100 (CET) [thread overview] Message-ID: <1492514284.249466.1641909382867.JavaMail.zimbra@nod.at> (raw) In-Reply-To: <0a7a5cce-1ee1-70b6-d368-615dfa0a617a@huawei.com> ----- Ursprüngliche Mail ----- > Von: "chengzhihao1" <chengzhihao1@huawei.com> > An: "richard" <richard@nod.at> > CC: "Miquel Raynal" <miquel.raynal@bootlin.com>, "Vignesh Raghavendra" <vigneshr@ti.com>, "mcoquelin stm32" > <mcoquelin.stm32@gmail.com>, "kirill shutemov" <kirill.shutemov@linux.intel.com>, "Sascha Hauer" > <s.hauer@pengutronix.de>, "linux-mtd" <linux-mtd@lists.infradead.org>, "linux-kernel" <linux-kernel@vger.kernel.org> > Gesendet: Dienstag, 11. Januar 2022 14:23:52 > Betreff: Re: [PATCH v6 12/15] ubi: fastmap: Add all fastmap pebs into 'ai->fastmap' when fm->used_blocks>=2 > 在 2022/1/11 19:57, Richard Weinberger 写道: >> ubi_wl_init() is called in both cases, with and without fastmap. > I agree. > >> And ai->fastmap contains all anchor PEBs that scan_fast() found. >> This can be the most recent but also outdated anchor PEBs. > Is it exists a case that outdated fastmap PEBs are neither counted into > 'fmhdr->erase_peb_count' nor scanned into 'ai->fastmap' after attaching > by fastmap. > [...] > I think UBI attaches failed by fastmap if kernel goes here. > 1870 err = erase_aeb(ubi, aeb, sync); Hmm, I think the paranoia check in fastmap.c is too strict these days. if (WARN_ON(count_fastmap_pebs(ai) != ubi->peb_count - ai->bad_peb_count - fm->used_blocks)) goto fail_bad; It does not account ai->fastmap. So if ai->fastmap contains old anchor PEBs this check will trigger and force falling back to scanning mode. With this check fixed, ubi_wl_init() will erase all old PEBs from ai->fastmap. So I agree that this code path is wonky and can be cleaned up. But please be extremely careful and give all your changes excessive testing with real workload and power-cuts. Thanks, //richard
WARNING: multiple messages have this Message-ID (diff)
From: Richard Weinberger <richard@nod.at> To: chengzhihao1 <chengzhihao1@huawei.com> Cc: Miquel Raynal <miquel.raynal@bootlin.com>, Vignesh Raghavendra <vigneshr@ti.com>, mcoquelin stm32 <mcoquelin.stm32@gmail.com>, kirill shutemov <kirill.shutemov@linux.intel.com>, Sascha Hauer <s.hauer@pengutronix.de>, linux-mtd <linux-mtd@lists.infradead.org>, linux-kernel <linux-kernel@vger.kernel.org> Subject: Re: [PATCH v6 12/15] ubi: fastmap: Add all fastmap pebs into 'ai->fastmap' when fm->used_blocks>=2 Date: Tue, 11 Jan 2022 14:56:22 +0100 (CET) [thread overview] Message-ID: <1492514284.249466.1641909382867.JavaMail.zimbra@nod.at> (raw) In-Reply-To: <0a7a5cce-1ee1-70b6-d368-615dfa0a617a@huawei.com> ----- Ursprüngliche Mail ----- > Von: "chengzhihao1" <chengzhihao1@huawei.com> > An: "richard" <richard@nod.at> > CC: "Miquel Raynal" <miquel.raynal@bootlin.com>, "Vignesh Raghavendra" <vigneshr@ti.com>, "mcoquelin stm32" > <mcoquelin.stm32@gmail.com>, "kirill shutemov" <kirill.shutemov@linux.intel.com>, "Sascha Hauer" > <s.hauer@pengutronix.de>, "linux-mtd" <linux-mtd@lists.infradead.org>, "linux-kernel" <linux-kernel@vger.kernel.org> > Gesendet: Dienstag, 11. Januar 2022 14:23:52 > Betreff: Re: [PATCH v6 12/15] ubi: fastmap: Add all fastmap pebs into 'ai->fastmap' when fm->used_blocks>=2 > 在 2022/1/11 19:57, Richard Weinberger 写道: >> ubi_wl_init() is called in both cases, with and without fastmap. > I agree. > >> And ai->fastmap contains all anchor PEBs that scan_fast() found. >> This can be the most recent but also outdated anchor PEBs. > Is it exists a case that outdated fastmap PEBs are neither counted into > 'fmhdr->erase_peb_count' nor scanned into 'ai->fastmap' after attaching > by fastmap. > [...] > I think UBI attaches failed by fastmap if kernel goes here. > 1870 err = erase_aeb(ubi, aeb, sync); Hmm, I think the paranoia check in fastmap.c is too strict these days. if (WARN_ON(count_fastmap_pebs(ai) != ubi->peb_count - ai->bad_peb_count - fm->used_blocks)) goto fail_bad; It does not account ai->fastmap. So if ai->fastmap contains old anchor PEBs this check will trigger and force falling back to scanning mode. With this check fixed, ubi_wl_init() will erase all old PEBs from ai->fastmap. So I agree that this code path is wonky and can be cleaned up. But please be extremely careful and give all your changes excessive testing with real workload and power-cuts. Thanks, //richard ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/
next prev parent reply other threads:[~2022-01-11 13:56 UTC|newest] Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-12-27 3:22 [PATCH v6 00/15] Some bugfixs for ubi/ubifs Zhihao Cheng 2021-12-27 3:22 ` Zhihao Cheng 2021-12-27 3:22 ` [PATCH v6 01/15] ubifs: rename_whiteout: Fix double free for whiteout_ui->data Zhihao Cheng 2021-12-27 3:22 ` Zhihao Cheng 2021-12-27 3:22 ` [PATCH v6 02/15] ubifs: Fix deadlock in concurrent rename whiteout and inode writeback Zhihao Cheng 2021-12-27 3:22 ` Zhihao Cheng 2021-12-27 3:22 ` [PATCH v6 03/15] ubifs: Fix wrong number of inodes locked by ui_mutex in ubifs_inode comment Zhihao Cheng 2021-12-27 3:22 ` Zhihao Cheng 2021-12-27 3:22 ` [PATCH v6 04/15] ubifs: Add missing iput if do_tmpfile() failed in rename whiteout Zhihao Cheng 2021-12-27 3:22 ` Zhihao Cheng 2021-12-27 3:22 ` [PATCH v6 05/15] ubifs: Rename whiteout atomically Zhihao Cheng 2021-12-27 3:22 ` Zhihao Cheng 2022-01-09 21:14 ` Richard Weinberger 2022-01-09 21:14 ` Richard Weinberger 2022-01-10 9:35 ` Zhihao Cheng 2022-01-10 9:35 ` Zhihao Cheng 2022-01-10 10:14 ` Richard Weinberger 2022-01-10 10:14 ` Richard Weinberger 2022-01-10 20:58 ` Richard Weinberger 2022-01-10 20:58 ` Richard Weinberger 2021-12-27 3:22 ` [PATCH v6 06/15] ubifs: Fix 'ui->dirty' race between do_tmpfile() and writeback work Zhihao Cheng 2021-12-27 3:22 ` Zhihao Cheng 2021-12-27 3:22 ` [PATCH v6 07/15] ubifs: Rectify space amount budget for mkdir/tmpfile operations Zhihao Cheng 2021-12-27 3:22 ` Zhihao Cheng 2021-12-27 3:22 ` [PATCH v6 08/15] ubifs: setflags: Make dirtied_ino_d 8 bytes aligned Zhihao Cheng 2021-12-27 3:22 ` Zhihao Cheng 2021-12-27 3:22 ` [PATCH v6 09/15] ubifs: Fix read out-of-bounds in ubifs_wbuf_write_nolock() Zhihao Cheng 2021-12-27 3:22 ` Zhihao Cheng 2021-12-27 3:22 ` [PATCH v6 10/15] ubifs: Fix to add refcount once page is set private Zhihao Cheng 2021-12-27 3:22 ` Zhihao Cheng 2021-12-27 3:22 ` [PATCH v6 11/15] ubi: fastmap: Return error code if memory allocation fails in add_aeb() Zhihao Cheng 2021-12-27 3:22 ` Zhihao Cheng 2021-12-27 3:22 ` [PATCH v6 12/15] ubi: fastmap: Add all fastmap pebs into 'ai->fastmap' when fm->used_blocks>=2 Zhihao Cheng 2021-12-27 3:22 ` Zhihao Cheng 2022-01-10 23:23 ` Richard Weinberger 2022-01-10 23:23 ` Richard Weinberger 2022-01-11 2:48 ` Zhihao Cheng 2022-01-11 2:48 ` Zhihao Cheng 2022-01-11 7:27 ` Richard Weinberger 2022-01-11 7:27 ` Richard Weinberger 2022-01-11 11:44 ` Zhihao Cheng 2022-01-11 11:44 ` Zhihao Cheng 2022-01-11 11:57 ` Richard Weinberger 2022-01-11 11:57 ` Richard Weinberger 2022-01-11 13:23 ` Zhihao Cheng 2022-01-11 13:23 ` Zhihao Cheng 2022-01-11 13:56 ` Richard Weinberger [this message] 2022-01-11 13:56 ` Richard Weinberger 2022-01-12 3:46 ` Zhihao Cheng 2022-01-12 3:46 ` Zhihao Cheng 2022-01-14 18:45 ` Richard Weinberger 2022-01-14 18:45 ` Richard Weinberger 2022-01-15 8:22 ` Zhihao Cheng 2022-01-15 8:22 ` Zhihao Cheng 2022-01-15 8:46 ` Zhihao Cheng 2022-01-15 8:46 ` Zhihao Cheng 2022-01-15 10:01 ` Richard Weinberger 2022-01-15 10:01 ` Richard Weinberger 2022-01-17 1:31 ` Zhihao Cheng 2022-01-17 1:31 ` Zhihao Cheng 2022-01-17 2:52 ` Zhihao Cheng 2022-01-17 2:52 ` Zhihao Cheng 2021-12-27 3:22 ` [PATCH v6 13/15] ubifs: ubifs_writepage: Mark page dirty after writing inode failed Zhihao Cheng 2021-12-27 3:22 ` Zhihao Cheng 2021-12-27 3:22 ` [PATCH v6 14/15] ubifs: ubifs_releasepage: Remove ubifs_assert(0) to valid this process Zhihao Cheng 2021-12-27 3:22 ` Zhihao Cheng 2021-12-27 3:22 ` [PATCH v6 15/15] ubi: fastmap: Fix high cpu usage of ubi_bgt by making sure wl_pool not empty Zhihao Cheng 2021-12-27 3:22 ` Zhihao Cheng 2022-01-17 1:40 ` Zhihao Cheng 2022-01-17 1:40 ` Zhihao Cheng 2021-12-27 10:13 ` [PATCH v6 00/15] Some bugfixs for ubi/ubifs Richard Weinberger 2021-12-27 10:13 ` Richard Weinberger 2021-12-27 12:19 ` Zhihao Cheng 2021-12-27 12:19 ` Zhihao Cheng 2021-12-27 13:00 ` Richard Weinberger 2021-12-27 13:00 ` Richard Weinberger
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