This series adds (on-line) resize feature to the nilfs2 filesystem. Both expansion and shrinking of the filesystem become possible with this series. Shrinking of the filesystem is realized with help from a user-land resize tool "nilfs-resize". It first sets a limit on the range of segments that the nilfs kernel code allocates, then moves in-use segments into the range by utilizing garbage collection API. A new ioctl command is added to limit the allocation range of segments. And, the existent resize ioctl is finally implemented. The nilfs-resize program is inteded to be a part of nilfs-utils (may be incorporated into the next util release). At present, it's only available from "resize" branch of the following git tree: http://git.nilfs.org/nilfs2-utils-devel.git -- see http://www.nilfs.org/git/ to know how to get it. The usage of this program is as follows: $ nilfs-resize [option] device [size] If the size is larger than the current filesystem size, nilfs-resize extends the filesystem to the given size. If the size is smaller than the current filesystem size, nilfs-resize tries to shrink the filesystem to the given size. The shrinking will fail if the filesystem does not have enough free space. Like other filesystems, the partition size must be extended before extending the filesystem size. This can be done by partition tools such as fdisk or lvmextend. Conversely, shrinking of the filesystem should be performed before truncating the partition. Off-line resizing is not yet available, and I'm feeling it needs some more consideration. The nilfs-resize tool is currently experimental, but the kernel patches work fine so far. So, I'm planning to queue them for the next merge window unless a critical problem arises. Thanks, Ryusuke Konishi -- Ryusuke Konishi (4): nilfs2: add ioctl which limits range of segment to be allocated nilfs2: add routine to move secondary super block nilfs2: add truncation routine of segment usage file nilfs2: implement resize ioctl -- To unsubscribe from this list: send the line "unsubscribe linux-nilfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
