bdev resize

[Christophe Varoqui]

Hello,

it is now a common feature for modern storage controlers to allow online volume resizing.
The Linux kernel SCSI subsystem seems to handle this pretty well through /sys/block/*/device/rescan :

# cat /sys/block/sda/size
41943040

<reconfigure the volume>

# echo 1>/sys/block/sda/device/rescan
# cat /sys/block/sda/size
52428800
# dmseg|tail -2
SCSI device sda: 52428800 512-byte hdwr sectors (26844 MB)
SCSI device sda: drive cache: write through

Still there's something going wrong : in the previous sample, sda had a mounted filesystem on it and BLKGETSIZE still reports the previous size.

If I umount the fs, this ioctl gives the new size, but mount -o remount does not work the same.
Hence, fully online resize is not possible.

Does someone is aware of this, and is it being worked on ?

Best regards,
cvaroqui
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