Messages in this thread | | | From | Vivek Goyal <> | Subject | [PATCH 0/2] block: online resize of disk partitions | Date | Mon, 13 Feb 2012 14:30:36 -0500 |
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Hi,
Following patch 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.
I made some changes according to the feedback received last time. 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 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
[PATCH 1/2] block: add partition resize function to blkpg ioctl [PATCH 2/2] resizepart: Utility to resize a partition
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