> On Thu, 8 Nov 2007 09:42:10 -0800 (PST) bugme-daemon@xxxxxxxxxxxxxxxxxxx wrote: > http://bugzilla.kernel.org/show_bug.cgi?id=9329 > > Summary: ext4: delalloc space accounting problem drops data > Product: File System > Version: 2.5 > KernelVersion: 2.6.24-rc1 > Platform: All > OS/Version: Linux > Tree: Mainline > Status: NEW > Severity: normal > Priority: P1 > Component: ext4 > AssignedTo: fs_ext4@xxxxxxxxxxxxxxxxxxxx > ReportedBy: sandeen@xxxxxxxxxx > > > 2.6.24-rc1 + ext4 git patch queue from last week or so. > > It appears that delalloc does not track used space properly, and fails to > return ENOSPC as appropriate: > > [root@bear-05 ~]# mkfs.ext3 -I 256 /dev/sdb7 32768 > [root@bear-05 ~]# mount -t ext4dev -o data=writeback,delalloc,extents,mballoc > /dev/sdb7 /mnt/test > [root@bear-05 ~]# df -h /mnt/test > Filesystem Size Used Avail Use% Mounted on > /dev/sdb7 30M 4.5M 24M 16% /mnt/test > [root@bear-05 ~]# du -h /tmp/1Mfile > 1.1M /tmp/1Mfile > [root@bear-05 ~]# for I in `seq 1 50`; do cp /tmp/1Mfile /mnt/test/1Mfile-$I; > done > [root@bear-05 ~]# df -h /mnt/test > Filesystem Size Used Avail Use% Mounted on > /dev/sdb7 30M 30M 0 100% /mnt/test > > all resulting files are 1M in length: > [root@bear-05 ~]# ls -l /mnt/test/1M* | grep -v 1048576 > [root@bear-05 ~]# ls -l /mnt/test/1M* | grep 1048576 | wc -l > 50 > but many of them have silently dropped data on the floor: > [root@bear-05 ~]# du -hc /mnt/test/1Mfile-* | grep -v "1.0M" > 596K /mnt/test/1Mfile-26 > 0 /mnt/test/1Mfile-27 > 0 /mnt/test/1Mfile-28 > 0 /mnt/test/1Mfile-29 > 0 /mnt/test/1Mfile-30 > <snip> > > When mounted with nodelalloc, I get proper behavior: > > [root@bear-05 ~]# for I in `seq 1 50`; do cp /tmp/1Mfile /mnt/test/1Mfile-$I; > done > cp: writing `/mnt/test/1Mfile-26': No space left on device > cp: writing `/mnt/test/1Mfile-27': No space left on device > cp: writing `/mnt/test/1Mfile-28': No space left on device > cp: writing `/mnt/test/1Mfile-29': No space left on device > <snip> > > > -- > Configure bugmail: http://bugzilla.kernel.org/userprefs.cgi?tab=email > ------- You are receiving this mail because: ------- > You are on the CC list for the bug, or are watching someone who is. - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
