On Thu, May 02, 2013 at 07:27:53PM +0800, Jeff Liu wrote: > From: Jie Liu <jeff.liu@xxxxxxxxxx> > > As per the mount man page, sunit and swidth can be changed via > mount options. For XFS, on the face of it, those options seems > works if the specified alignments is properly, e.g. > # mount -o sunit=4096,swidth=8192 /dev/sdb1 /mnt > # mount | grep sdb1 > /dev/sdb1 on /mnt type xfs (rw,sunit=4096,swidth=8192) > > However, neither sunit nor swidth is shown from the xfs_info output. > # xfs_info /mnt > meta-data=/dev/sdb1 isize=256 agcount=4, agsize=262144 blks > = sectsz=512 attr=2 > data = bsize=4096 blocks=1048576, imaxpct=25 > = sunit=0 swidth=0 blks > ^^^^^^^^^^^^^^^^^^^^^^^^^^ > naming =version 2 bsize=4096 ascii-ci=0 > log =internal bsize=4096 blocks=2560, version=2 > = sectsz=512 sunit=0 blks, lazy-count=1 > realtime =none extsz=4096 blocks=0, rtextents=0 > > The reason is that the alignment can only be changed if the relevant > super block is already configured with alignments, otherwise, the > given value is silently ignored. > > With this fix, the attempt to mount a storage without strip alignment > setup on a super block will get an error with a warning in syslog to > indicate the true cause, e.g. > # mount -o sunit=4096,swidth=8192 /dev/sdb1 /mnt > mount: wrong fs type, bad option, bad superblock on /dev/sdb1, > missing codepage or helper program, or other error > In some cases useful info is found in syslog - try > dmesg | tail or so > ....... > XFS (sdb1): cannot change alignment: superblock does not support data > alignment > > Signed-off-by: Jie Liu <jeff.liu@xxxxxxxxxx> > Cc: Mark Tinguely <tinguely@xxxxxxx> > Cc: Dave Chinner <dchinner@xxxxxxxxxx> Applied. _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
