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Date: Thu, 27 Nov 2008 08:30:28 +0800 From: Li Zefan <lizf@...fujitsu.com> To: Akira Fujita <a-fujita@...jp.nec.com> CC: linux-ext4@...r.kernel.org Subject: Re: bugs of Online Defragmentation Akira Fujita wrote: > Hi Li, > > Thank you for testing and sorry for delay reply. > I am looking into this problem now, > It seems to take a little time to fix. > > (In my look, s_dirty_blocks goes wrong so that free blocks > on memory decreases. Maybe delalloc handling isn't good) > Take your time. I'll test it once new version of online defrag is released. :) > Thanks, > Akira Fujita > > Li Zefan wrote: >> I tested Online Defrag, and seems this feature is still >> very unstable. >> >> 1) >> >> # mkfs.ext4 -m 0 -b 1024 -O ^flex_bg /dev/sdb7 >> # mount -t ext4 -o nodelalloc /dev/sdb7 mnt_point >> # (age /dev/sdb7 using ffsb) >> ... >> # df >> Filesystem 1K-blocks Used Available Use% Mounted on >> ... >> /dev/sdb7 5159829 5118866 40963 100% ... >> >> sdb7 has 40M free space left. And I ran e4defrag on a directory full >> of small files (most < 1M), but all failed, and dmesg didn't tell >> me the reasion. >> >> # e4defrag mnt_point/data0/ >> ... >> [62/1562]/../mnt_point/data0/fillfile1420: 0% [ NG ] >> [63/1562]/../mnt_point/data0/fillfile188: 0% [ NG ] >> ... >> Success: [ 0/1562 ] >> Failure: [ 1562/1562 ] >> >> # df >> Filesystem 1K-blocks Used Available Use% Mounted on >> ... >> /dev/sdb7 5159829 5159807 22 100% ... >> >> Though all failed, but now the 40M free space was occupied, why? >> >> If delalloc is turned on, things are somewhat different, most files can >> be defraged, and dmesg told me not enough free blocks for the failure >> cases. >> >> 2) >> >> I sometimes got panic after defrag a directory: >> >> Dirty block accounting went wrong -8977 >> Dirty block accounting went wrong -9279 >> Dirty block accounting went wrong -9718 >> Dirty block accounting went wrong -10258 >> ... >> ... >> Dirty block accounting went wrong -157352 >> Dirty block accounting went wrong -157700 >> EXT4-fs error(device sdb7): ext_mb_free_metadata: Double free of >> blocks 985 (984 2) >> > > -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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