Messages in this thread | | | Date | Mon, 09 Jul 2012 17:34:18 -0400 | From | vgoyal@redhat ... | Subject | [patch 0/2] [V4] block: Support online resize of disk partitions |
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Hi,
Few people have pinged me in rencent past about status of this patch, hence, this is V4 of patch which adds support for online resizing of a partition. This patch is based on previously posted patches by Phillip Susi.
There are two patches. Out of which one is kernel patch and other one is util-linux patch to add support of a user space utility "resizepart" to allow resizing the partition.
This ioctl only resizes the partition size in kenrel and does not change the size on disk. A user needs to make sure that corresponding changes are made to disk data structures also using fdisk(or partx), if changes are to be retained across reboot.
Changes since V3 ---------------- - Do bdput() in error path as per the Maxim's review comments.
Changes since V2 ---------------- - Do not ignore the "start" parameter in RESIZE ioctl. - Change resizepart utility to parse sysfs to get to partition start.
Changes since V1 ---------------- Following are changes since the version Phillip posted. - RESIZE ioctl ignores the partition "start" and does not expect user to specify one. Caller needs to just specify "device", "partition number" and "size" of new partition.
- Got rid of part_nr_sects_write_begin/part_nr_sects_write_end functions and replaced these with single part_nr_sects_write().
- Some sequence counter related changes are simply lifted from i_size_write().
- Initialized part->nr_sects_seq using seqcount_init().
Phillip, do let me know if I should put your signed-off-by also in the patch.
Any review feedback is welcome.
I did following test.
- Create a partition of 10MB on a disk using fdisk. - Add this partition to a volume group - Use fdisk to increase the partition size to 20MB. (First delete the partition and then create a new one of 20MB size). - Use resizepart to extend partition size in kernel. resizepart /dev/sdc 1 40960 - Do pvresize on partition so that physical volume can be incrased in size online. pvresize /dev/sda1
pvresize does recognize the new size. Also lsblk and /proc/partitions report the new size of partition.
Thanks Vivek
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