Hi, This is V3 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 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 [PATCH 1/2] block: add partition resize function to blkpg ioctl [PATCH 2/2] util-linux: resizepart: Utility to resize a partition -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
