From v@renyi.hu Tue May 19 11:28:42 2009 Received: from mirror.math-inst.hu ([193.224.79.10]) by stoneboat.aleph1.co.uk with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.69) (envelope-from ) id 1M6MYn-0004K5-1b for yaffs@lists.aleph1.co.uk; Tue, 19 May 2009 11:28:42 +0100 Received: from hexagon.math-inst.hu ([193.224.79.1]) by mirror.math-inst.hu with esmtps(TLSv1:AES256-SHA:256) (Exim) from id 1M6MYj-0001zp-1h for ; Tue, 19 May 2009 12:28:33 +0200 Received: from v (helo=localhost) by hexagon.math-inst.hu with local-esmtp (Exim) id 1M6MYi-0004gM-W0 from for ; Tue, 19 May 2009 12:28:33 +0200 Date: Tue, 19 May 2009 12:28:32 +0200 (CEST) From: Babrian Viktor X-X-Sender: v@hexagon.math-inst.hu To: yaffs@lists.aleph1.co.uk Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-SPF: X-SA-Exim-Connect-IP: 193.224.79.10 X-SA-Exim-Mail-From: v@renyi.hu X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on stoneboat.aleph1.co.uk X-Spam-Level: X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00 autolearn=no version=3.2.5 X-SA-Exim-Version: 4.2.1 (built Wed, 25 Jun 2008 17:14:11 +0000) X-SA-Exim-Scanned: Yes (on stoneboat.aleph1.co.uk) Subject: [Yaffs] power cycle during rm X-BeenThere: yaffs@lists.aleph1.co.uk X-Mailman-Version: 2.1.11 Precedence: list List-Id: Discussion of YAFFS NAND flash filesystem List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 May 2009 10:28:43 -0000 Hi all, I experience a strange phenomenon if I do a power cycle during performing a file removal. It is easily reproduceable (at least using my setup). I am using a fairly new (on week old or so) version of yaffs2, kernel version 2.6.26, yaffs_guts.c version: 1.82. (however I also got the very same results with a somewhat older version) (note: all other functionality seems to be OK) Here is what I do briefly: - flash_eraseall /dev/mtd13 - mount as yaffs2 - creating 2 files (dd if=/dev/zero of=/mnt/file bs=1M count=100) - removing the second one (interrupted by power cycle) - reboot, mount - df, ls show things correctly - now I re-create the second file - ls is correct - df shows much less free space than expected (the usable space is limited; free space is 'lost') here is what I do exactly: (flash_erase, mount not included, started from creating the second file) / $ ls -l /mnt -rw-r--r-- 1 root root 104857600 Jan 1 00:04 file drw-rw-rw- 1 root root 2048 Jan 1 00:00 lost+found / $ df Filesystem 1k-blocks Used Available Use% Mounted on /dev/mtdblock5 32768 18184 14584 55% / tmpfs 63956 0 63956 0% /var/tmp /dev/mtdblock13 2097152 106372 1990780 5% /mnt / $ dd if=/dev/zero of=/mnt/file1 bs=1M count=100 100+0 records in 100+0 records out / $ ls -l /mnt -rw-r--r-- 1 root root 104857600 Jan 1 00:04 file -rw-r--r-- 1 root root 104857600 Jan 1 00:05 file1 drw-rw-rw- 1 root root 2048 Jan 1 00:00 lost+found / $ df Filesystem 1k-blocks Used Available Use% Mounted on /dev/mtdblock5 32768 18184 14584 55% / tmpfs 63956 0 63956 0% /var/tmp /dev/mtdblock13 2097152 208900 1888252 10% /mnt / $ / $ rm /mnt/file1 !!!!!!!! interrupted by power cycle //after reboot, mount: (still normal) / $ ls -l /mnt/ -rw-r--r-- 1 root root 104857600 Jan 1 00:04 file drw-rw-rw- 1 root root 2048 Jan 1 00:00 lost+found / $ df Filesystem 1k-blocks Used Available Use% Mounted on /dev/mtdblock5 32768 18120 14648 55% / tmpfs 63956 0 63956 0% /var/tmp /dev/mtdblock13 2097152 106372 1990780 5% /mnt / $ // and the strange part: / $ dd if=/dev/zero of=/mnt/file1 bs=1M count=100 ls -l /mnt df 100+0 records in 100+0 records out / $ ls -l /mnt -rw-r--r-- 1 root root 104857600 Jan 1 00:05 file -rw-r--r-- 1 root root 104857600 Jan 1 00:01 file1 drw-rw-rw- 1 root root 2048 Jan 1 00:00 lost+found / $ df Filesystem 1k-blocks Used Available Use% Mounted on /dev/mtdblock5 32768 18124 14644 55% / tmpfs 63956 0 63956 0% /var/tmp /dev/mtdblock13 2097152 742624 1354528 35% /mnt / $ It can be seen that the number of used blocks is very high (without reason). / $ cat /proc/yaffs YAFFS built:May 19 2009 05:24:47 $Id: yaffs_fs.c,v 1.79 2009/03/17 01:12:00 wookey Exp $ $Id: yaffs_guts.c,v 1.82 2009/03/09 04:24:17 charles Exp $ Device 0 "MAP" startBlock......... 0 endBlock........... 16383 totalBytesPerChunk. 2048 nDataBytesPerChunk. 2048 chunkGroupBits..... 0 chunkGroupSize..... 1 nErasedBlocks...... 14764 nReservedBlocks.... 5 blocksInCheckpoint. 0 nTnodesCreated..... 7400 nFreeTnodes........ 77 nObjectsCreated.... 200 nFreeObjects....... 93 nFreeChunks........ 678095 nPageWrites........ 0 nPageReads......... 0 nBlockErasures..... 695 nGCCopies.......... 2 garbageCollections. 4865 passiveGCs......... 4865 nRetriedWrites..... 0 nShortOpCaches..... 10 nRetireBlocks...... 0 eccFixed........... 0 eccUnfixed......... 0 tagsEccFixed....... 0 tagsEccUnfixed..... 0 cacheHits.......... 0 nDeletedFiles...... 1 nUnlinkedFiles..... 1 nBackgroudDeletions 0 useNANDECC......... 1 isYaffs2........... 1 inbandTags......... 0 / $ Note: the same happens with any number of files (including 1) I have searched the net for similar cases but the ones I found are 4 years old and seemingly solved. Is the problem familiar to anyone here? What logs/traces should I make to find the lost blocks? Any help is appreciated, Viktor Babrian