2014-02-24 9:57 GMT+09:00, Dave Chinner <david@xxxxxxxxxxxxx>: > 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. Okay. > >> ext4: Add support FALLOC_FL_COLLAPSE_RANGE for fallocate > > I've left this one alone for the ext4 guys to sort out. I will try to follow up continously. > >> xfsprog: xfsio: Add support FALLOC_FL_COLLAPSE_RANGE for fallocate > > That's already in a current xfstests tree. Okay. > >> 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. Okay. > >> manpage: update FALLOC_FL_COLLAPSE_RANGE flag in fallocate > > And Michael will need to review and commit that to the kernel > manpages tree. Okay, Hi Micheal. Could you please review manpage patch ? Thanks :) > > Cheers, > > Dave. > -- > Dave Chinner > david@xxxxxxxxxxxxx > _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
