On Wed, Feb 19, 2014 at 01:37:16AM +0900, Namjae Jeon wrote: > From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx> > > This patch series is in response of the following post: > http://lwn.net/Articles/556136/ > "ext4: introduce two new ioctls" > > Dave chinner suggested that truncate_block_range > (which was one of the ioctls name) should be an fallocate operation > and not any fs specific ioctl, hence we add this functionality to fallocate. > > This patch series introduces new flag FALLOC_FL_COLLAPSE_RANGE for fallocate > and implements it for XFS and Ext4. > > The semantics of this flag are following: > 1) It collapses the range lying between offset and length by removing any data > blocks which are present in this range and than updates all the logical > offsets of extents beyond "offset + len" to nullify the hole created by > removing blocks. In short, it does not leave a hole. > 2) It should be used exclusively. No other fallocate flag in combination. > 3) Offset and length supplied to fallocate should be fs block size aligned > in case of xfs and ext4. > 4) Collaspe range does not work beyond i_size. > > This new functionality of collapsing range could be used by media editing tools > which does non linear editing to quickly purge and edit parts of a media file. > This will immensely improve the performance of these operations. > The limitation of fs block size aligned offsets can be easily handled > by media codecs which are encapsulated in a conatiner as they have to > just change the offset to next keyframe value to match the proper alignment. > > Namjae Jeon (10): > fs: Add new flag(FALLOC_FL_COLLAPSE_RANGE) for fallocate > xfs: Add support FALLOC_FL_COLLAPSE_RANGE for fallocate I've pushed these to the following branch: git://oss.sgi.com/xfs/xfs.git xfs-collapse-range And so they'll be in tomorrow's linux-next tree. > ext4: Add support FALLOC_FL_COLLAPSE_RANGE for fallocate I've left this one alone for the ext4 guys to sort out. > xfsprog: xfsio: Add support FALLOC_FL_COLLAPSE_RANGE for fallocate That's already in a current xfstests tree. > xfstest: shared/001: Standard collapse range tests > xfstest: shared/002: Delayed allocation collapse range > xfstest: shared/003: Multi collapse range tests > xfstest: shared/004: Delayed allocation multi collapse > xfstest: shared/005: Test multiple fallocate collapse These are now in the xfstests git tree. > manpage: update FALLOC_FL_COLLAPSE_RANGE flag in fallocate And Michael will need to review and commit that to the kernel manpages tree. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
