From: "Darrick J. Wong" <darrick.wong@oracle.com> To: david@fromorbit.com, darrick.wong@oracle.com Cc: linux-fsdevel@vger.kernel.org, vishal.l.verma@intel.com, bfoster@redhat.com, xfs@oss.sgi.com Subject: [PATCH v7 00/47] xfs: add reverse mapping support Date: Wed, 20 Jul 2016 21:55:55 -0700 [thread overview] Message-ID: <146907695530.25461.3225785294902719773.stgit@birch.djwong.org> (raw) Hi all, This is the seventh revision of a patchset that adds to XFS kernel support for tracking reverse-mappings of physical blocks to file and metadata (rmap). Per reviewers' request with v6, I am splitting the gigantic patchbombs into separate functional areas. Given the significant amount of design assumptions that change with block sharing, rmap and reflink are provided together. There shouldn't be any incompatible on-disk format changes, pending a thorough review of the patches within. The reverse mapping implementation features a simple per-AG b+tree containing tuples of (physical block, owner, offset, blockcount) with the key being the first three fields. The large record size will enable us to reconstruct corrupt block mapping btrees (bmbt); the large key size is necessary to identify uniquely each rmap record in the presence of shared physical blocks. In contrast to previous iterations of this patchset, it is no longer a requirement that there be a 1:1 correspondence between bmbt and rmapbt records; each rmapbt record can cover multiple bmbt records. Since the previous posting, I have made some major changes to the underlying XFS common code. First, I have extended the generic b+tree implementation to support overlapping intervals, which is necessary for the rmapbt on a reflink filesystem where there can be a number of rmapbt records representing a physical block. The new b+tree variant introduces the notion of a "high key" for each record; it is the highest key that can be used to identify a record. On disk, an overlapped-interval b+tree looks like a traditional b+tree except that nodes store both the lowest key and the highest key accessible through that subtree pointer. There's a new interval query function that uses both keys to iterate all records overlapping a given range of keys. This change allows us to remove the old requirement that each bmbt record correspond to a matching rmapbt record. The second big change is to the xfs_bmap_free functions. The existing code implements a mechanism to defer metadata (specifically, free space b+tree) updates across a transaction commit by logging redo items that can be replayed during recovery. It is an elegant way to avoid running afoul of AG locking order rules /and/ it can in theory be used to get around running out of transaction reservation. That said, I have refactored it into a generic "deferred operations" mechanism that can defer arbitrary types of work to a subsequent rolled transaction. The framework thus allows me to schedule rmapbt, refcountbt, and bmbt updates while maintaining correct redo in case of failure. At the very end of the patchset is an initial implementation of a GETFSMAP ioctl for userland to query the physical block mapping of a filesystem. The first few patches fix various vfs/xfs bugs, adds an enhancement to the xfs_buf tracepoints so that we can analyze buffer deadlocks, and merges difference between the kernel and userspace libxfs so that the rest of the patches apply consistently. If you're going to start using this mess, you probably ought to just pull from my github trees for kernel[1], xfsprogs[2], and xfstests[3]. There are also updates for xfs-docs[4] and man-pages[5]. The kernel patches should apply to dchinner's for-next; xfsprogs patches to for-next; and xfstest to master. The patches have been xfstested with x64, i386, ppc64, and armv7l. All three architectures pass all 'clone' group tests. This is an extraordinary way to eat your data. Enjoy! Comments and questions are, as always, welcome. --D [1] https://github.com/djwong/linux/tree/for-dave-for-4.8 [2] https://github.com/djwong/xfsprogs/tree/djwong-experimental [3] https://github.com/djwong/xfstests/tree/djwong-devel [4] https://github.com/djwong/xfs-documentation/tree/djwong-devel [5] https://github.com/djwong/man-pages/tree/djwong-devel
WARNING: multiple messages have this Message-ID (diff)
From: "Darrick J. Wong" <darrick.wong@oracle.com> To: david@fromorbit.com, darrick.wong@oracle.com Cc: linux-fsdevel@vger.kernel.org, vishal.l.verma@intel.com, bfoster@redhat.com, xfs@oss.sgi.com Subject: [PATCH v7 00/47] xfs: add reverse mapping support Date: Wed, 20 Jul 2016 21:55:55 -0700 [thread overview] Message-ID: <146907695530.25461.3225785294902719773.stgit@birch.djwong.org> (raw) Hi all, This is the seventh revision of a patchset that adds to XFS kernel support for tracking reverse-mappings of physical blocks to file and metadata (rmap). Per reviewers' request with v6, I am splitting the gigantic patchbombs into separate functional areas. Given the significant amount of design assumptions that change with block sharing, rmap and reflink are provided together. There shouldn't be any incompatible on-disk format changes, pending a thorough review of the patches within. The reverse mapping implementation features a simple per-AG b+tree containing tuples of (physical block, owner, offset, blockcount) with the key being the first three fields. The large record size will enable us to reconstruct corrupt block mapping btrees (bmbt); the large key size is necessary to identify uniquely each rmap record in the presence of shared physical blocks. In contrast to previous iterations of this patchset, it is no longer a requirement that there be a 1:1 correspondence between bmbt and rmapbt records; each rmapbt record can cover multiple bmbt records. Since the previous posting, I have made some major changes to the underlying XFS common code. First, I have extended the generic b+tree implementation to support overlapping intervals, which is necessary for the rmapbt on a reflink filesystem where there can be a number of rmapbt records representing a physical block. The new b+tree variant introduces the notion of a "high key" for each record; it is the highest key that can be used to identify a record. On disk, an overlapped-interval b+tree looks like a traditional b+tree except that nodes store both the lowest key and the highest key accessible through that subtree pointer. There's a new interval query function that uses both keys to iterate all records overlapping a given range of keys. This change allows us to remove the old requirement that each bmbt record correspond to a matching rmapbt record. The second big change is to the xfs_bmap_free functions. The existing code implements a mechanism to defer metadata (specifically, free space b+tree) updates across a transaction commit by logging redo items that can be replayed during recovery. It is an elegant way to avoid running afoul of AG locking order rules /and/ it can in theory be used to get around running out of transaction reservation. That said, I have refactored it into a generic "deferred operations" mechanism that can defer arbitrary types of work to a subsequent rolled transaction. The framework thus allows me to schedule rmapbt, refcountbt, and bmbt updates while maintaining correct redo in case of failure. At the very end of the patchset is an initial implementation of a GETFSMAP ioctl for userland to query the physical block mapping of a filesystem. The first few patches fix various vfs/xfs bugs, adds an enhancement to the xfs_buf tracepoints so that we can analyze buffer deadlocks, and merges difference between the kernel and userspace libxfs so that the rest of the patches apply consistently. If you're going to start using this mess, you probably ought to just pull from my github trees for kernel[1], xfsprogs[2], and xfstests[3]. There are also updates for xfs-docs[4] and man-pages[5]. The kernel patches should apply to dchinner's for-next; xfsprogs patches to for-next; and xfstest to master. The patches have been xfstested with x64, i386, ppc64, and armv7l. All three architectures pass all 'clone' group tests. This is an extraordinary way to eat your data. Enjoy! Comments and questions are, as always, welcome. --D [1] https://github.com/djwong/linux/tree/for-dave-for-4.8 [2] https://github.com/djwong/xfsprogs/tree/djwong-experimental [3] https://github.com/djwong/xfstests/tree/djwong-devel [4] https://github.com/djwong/xfs-documentation/tree/djwong-devel [5] https://github.com/djwong/man-pages/tree/djwong-devel _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs
next reply other threads:[~2016-07-21 4:56 UTC|newest] Thread overview: 241+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-07-21 4:55 Darrick J. Wong [this message] 2016-07-21 4:55 ` [PATCH v7 00/47] xfs: add reverse mapping support Darrick J. Wong 2016-07-21 4:56 ` [PATCH 01/47] vfs: fix return type of ioctl_file_dedupe_range Darrick J. Wong 2016-07-21 4:56 ` Darrick J. Wong 2016-08-01 6:33 ` Christoph Hellwig 2016-08-01 6:33 ` Christoph Hellwig 2016-07-21 4:56 ` [PATCH 02/47] vfs: support FS_XFLAG_REFLINK and FS_XFLAG_COWEXTSIZE Darrick J. Wong 2016-07-21 4:56 ` Darrick J. Wong 2016-08-01 6:33 ` Christoph Hellwig 2016-08-01 6:33 ` Christoph Hellwig 2016-07-21 4:56 ` [PATCH 03/47] xfs: fix attr shortform structure alignment on cris Darrick J. Wong 2016-07-21 4:56 ` Darrick J. Wong 2016-07-26 16:36 ` Brian Foster 2016-07-26 16:36 ` Brian Foster 2016-08-01 6:34 ` Christoph Hellwig 2016-08-01 6:34 ` Christoph Hellwig 2016-07-21 4:56 ` [PATCH 04/47] xfs: fix locking of the rt bitmap/summary inodes Darrick J. Wong 2016-07-21 4:56 ` Darrick J. Wong 2016-07-26 16:36 ` Brian Foster 2016-07-26 16:36 ` Brian Foster 2016-07-28 18:58 ` Darrick J. Wong 2016-07-28 18:58 ` Darrick J. Wong 2016-08-01 6:34 ` Christoph Hellwig 2016-08-01 6:34 ` Christoph Hellwig 2016-07-21 4:56 ` [PATCH 05/47] xfs: set *stat=1 after iroot realloc Darrick J. Wong 2016-07-21 4:56 ` Darrick J. Wong 2016-07-26 16:36 ` Brian Foster 2016-07-26 16:36 ` Brian Foster 2016-08-01 6:35 ` Christoph Hellwig 2016-08-01 6:35 ` Christoph Hellwig 2016-07-21 4:56 ` [PATCH 06/47] xfs: during btree split, save new block key & ptr for future insertion Darrick J. Wong 2016-07-21 4:56 ` Darrick J. Wong 2016-07-26 16:36 ` Brian Foster 2016-07-26 16:36 ` Brian Foster 2016-08-01 6:37 ` Christoph Hellwig 2016-08-01 6:37 ` Christoph Hellwig 2016-07-21 4:56 ` [PATCH 07/47] xfs: add function pointers for get/update keys to the btree Darrick J. Wong 2016-07-21 4:56 ` Darrick J. Wong 2016-07-26 19:09 ` Brian Foster 2016-07-26 19:09 ` Brian Foster 2016-07-28 19:13 ` Darrick J. Wong 2016-07-28 19:13 ` Darrick J. Wong 2016-07-28 19:46 ` [PATCH v2 " Darrick J. Wong 2016-07-28 19:46 ` Darrick J. Wong 2016-08-01 15:57 ` Brian Foster 2016-08-01 15:57 ` Brian Foster 2016-08-01 17:54 ` Darrick J. Wong 2016-08-01 17:54 ` Darrick J. Wong 2016-08-01 6:39 ` [PATCH " Christoph Hellwig 2016-08-01 6:39 ` Christoph Hellwig 2016-08-01 17:33 ` Darrick J. Wong 2016-08-01 17:33 ` Darrick J. Wong 2016-08-02 12:23 ` Christoph Hellwig 2016-08-02 12:23 ` Christoph Hellwig 2016-08-03 0:12 ` Darrick J. Wong 2016-08-03 0:12 ` Darrick J. Wong 2016-07-21 4:56 ` [PATCH 08/47] xfs: support btrees with overlapping intervals for keys Darrick J. Wong 2016-07-21 4:56 ` Darrick J. Wong 2016-08-01 6:48 ` Christoph Hellwig 2016-08-01 6:48 ` Christoph Hellwig 2016-08-01 19:11 ` Darrick J. Wong 2016-08-01 19:11 ` Darrick J. Wong 2016-08-02 12:03 ` Christoph Hellwig 2016-08-02 12:03 ` Christoph Hellwig 2016-08-03 3:29 ` Darrick J. Wong 2016-08-03 3:29 ` Darrick J. Wong 2016-08-02 14:04 ` Brian Foster 2016-08-02 14:04 ` Brian Foster 2016-08-03 1:06 ` Dave Chinner 2016-08-03 1:06 ` Dave Chinner 2016-08-01 17:47 ` Brian Foster 2016-08-01 17:47 ` Brian Foster 2016-08-01 19:18 ` Darrick J. Wong 2016-08-01 19:18 ` Darrick J. Wong 2016-07-21 4:56 ` [PATCH 09/47] xfs: introduce interval queries on btrees Darrick J. Wong 2016-07-21 4:56 ` Darrick J. Wong 2016-08-01 8:00 ` Christoph Hellwig 2016-08-01 8:00 ` Christoph Hellwig 2016-07-21 4:57 ` [PATCH 10/47] xfs: refactor btree owner change into a separate visit-blocks function Darrick J. Wong 2016-07-21 4:57 ` Darrick J. Wong 2016-08-01 6:50 ` Christoph Hellwig 2016-08-01 6:50 ` Christoph Hellwig 2016-07-21 4:57 ` [PATCH 11/47] xfs: move deferred operations into a separate file Darrick J. Wong 2016-07-21 4:57 ` Darrick J. Wong 2016-08-01 7:08 ` Christoph Hellwig 2016-08-01 7:08 ` Christoph Hellwig 2016-08-01 8:02 ` Christoph Hellwig 2016-08-01 8:02 ` Christoph Hellwig 2016-08-02 22:39 ` Dave Chinner 2016-08-02 22:39 ` Dave Chinner 2016-08-03 9:16 ` Christoph Hellwig 2016-08-03 9:16 ` Christoph Hellwig 2016-08-03 22:57 ` Dave Chinner 2016-08-03 22:57 ` Dave Chinner 2016-08-04 16:00 ` Christoph Hellwig 2016-08-04 16:00 ` Christoph Hellwig 2016-08-04 23:44 ` Dave Chinner 2016-08-04 23:44 ` Dave Chinner 2016-08-02 17:30 ` Brian Foster 2016-08-02 17:30 ` Brian Foster 2016-07-21 4:57 ` [PATCH 12/47] xfs: add tracepoints for the deferred ops mechanism Darrick J. Wong 2016-07-21 4:57 ` Darrick J. Wong 2016-07-21 4:57 ` [PATCH 13/47] xfs: clean up typedef usage in the EFI/EFD handling code Darrick J. Wong 2016-07-21 4:57 ` Darrick J. Wong 2016-08-01 7:09 ` Christoph Hellwig 2016-08-01 7:09 ` Christoph Hellwig 2016-07-21 4:57 ` [PATCH 14/47] xfs: enable the xfs_defer mechanism to process extents to free Darrick J. Wong 2016-07-21 4:57 ` Darrick J. Wong 2016-08-01 7:09 ` Christoph Hellwig 2016-08-02 17:30 ` Brian Foster 2016-08-02 17:30 ` Brian Foster 2016-07-21 4:57 ` [PATCH 15/47] xfs: rework xfs_bmap_free callers to use xfs_defer_ops Darrick J. Wong 2016-07-21 4:57 ` Darrick J. Wong 2016-08-02 17:30 ` Brian Foster 2016-08-02 17:30 ` Brian Foster 2016-07-21 4:57 ` [PATCH 16/47] xfs: change xfs_bmap_{finish, cancel, init, free} -> xfs_defer_* Darrick J. Wong 2016-07-21 4:57 ` Darrick J. Wong 2016-08-02 17:30 ` Brian Foster 2016-08-02 17:30 ` Brian Foster 2016-08-02 20:47 ` Darrick J. Wong 2016-08-02 20:47 ` Darrick J. Wong 2016-07-21 4:57 ` [PATCH 17/47] xfs: rename flist/free_list to dfops Darrick J. Wong 2016-07-21 4:57 ` Darrick J. Wong 2016-08-02 17:30 ` Brian Foster 2016-08-02 17:30 ` Brian Foster 2016-07-21 4:58 ` [PATCH 18/47] xfs: refactor redo intent item processing Darrick J. Wong 2016-07-21 4:58 ` Darrick J. Wong 2016-08-01 8:10 ` Christoph Hellwig 2016-08-01 8:10 ` Christoph Hellwig 2016-08-02 20:35 ` Darrick J. Wong 2016-08-02 20:35 ` Darrick J. Wong 2016-08-02 18:47 ` Brian Foster 2016-08-02 18:47 ` Brian Foster 2016-07-21 4:58 ` [PATCH 19/47] xfs: add tracepoints and error injection for deferred extent freeing Darrick J. Wong 2016-07-21 4:58 ` Darrick J. Wong 2016-08-02 18:48 ` Brian Foster 2016-08-02 18:48 ` Brian Foster 2016-08-02 20:24 ` Darrick J. Wong 2016-08-02 20:24 ` Darrick J. Wong 2016-08-02 21:38 ` Brian Foster 2016-08-02 21:38 ` Brian Foster 2016-08-02 22:43 ` Darrick J. Wong 2016-08-02 22:43 ` Darrick J. Wong 2016-07-21 4:58 ` [PATCH 20/47] xfs: increase XFS_BTREE_MAXLEVELS to fit the rmapbt Darrick J. Wong 2016-07-21 4:58 ` Darrick J. Wong 2016-08-02 18:48 ` Brian Foster 2016-08-02 18:48 ` Brian Foster 2016-08-02 20:06 ` Darrick J. Wong 2016-08-02 20:06 ` Darrick J. Wong 2016-08-02 21:38 ` Brian Foster 2016-08-02 21:38 ` Brian Foster 2016-07-21 4:58 ` [PATCH 21/47] xfs: introduce rmap btree definitions Darrick J. Wong 2016-07-21 4:58 ` Darrick J. Wong 2016-07-21 4:58 ` [PATCH 22/47] xfs: add rmap btree stats infrastructure Darrick J. Wong 2016-07-21 4:58 ` Darrick J. Wong 2016-07-21 4:58 ` [PATCH 23/47] xfs: rmap btree add more reserved blocks Darrick J. Wong 2016-07-21 4:58 ` Darrick J. Wong 2016-07-21 4:58 ` [PATCH 24/47] xfs: add owner field to extent allocation and freeing Darrick J. Wong 2016-07-21 4:58 ` Darrick J. Wong 2016-07-21 4:58 ` [PATCH 25/47] xfs: introduce rmap extent operation stubs Darrick J. Wong 2016-07-21 4:58 ` Darrick J. Wong 2016-07-21 4:58 ` [PATCH 26/47] xfs: define the on-disk rmap btree format Darrick J. Wong 2016-07-21 4:58 ` Darrick J. Wong 2016-07-21 4:59 ` [PATCH 27/47] xfs: add rmap btree growfs support Darrick J. Wong 2016-07-21 4:59 ` Darrick J. Wong 2016-07-21 4:59 ` [PATCH 28/47] xfs: rmap btree transaction reservations Darrick J. Wong 2016-07-21 4:59 ` Darrick J. Wong 2016-07-21 4:59 ` [PATCH 29/47] xfs: rmap btree requires more reserved free space Darrick J. Wong 2016-07-21 4:59 ` Darrick J. Wong 2016-07-21 4:59 ` [PATCH 30/47] xfs: add rmap btree operations Darrick J. Wong 2016-07-21 4:59 ` Darrick J. Wong 2016-07-21 4:59 ` [PATCH 31/47] xfs: support overlapping intervals in the rmap btree Darrick J. Wong 2016-07-21 4:59 ` Darrick J. Wong 2016-07-21 4:59 ` [PATCH 32/47] xfs: teach rmapbt to support interval queries Darrick J. Wong 2016-07-21 4:59 ` Darrick J. Wong 2016-07-21 4:59 ` [PATCH 33/47] xfs: add tracepoints for the rmap functions Darrick J. Wong 2016-07-21 4:59 ` Darrick J. Wong 2016-07-21 4:59 ` [PATCH 34/47] xfs: add an extent to the rmap btree Darrick J. Wong 2016-07-21 4:59 ` Darrick J. Wong 2016-07-21 4:59 ` [PATCH 35/47] xfs: remove an extent from " Darrick J. Wong 2016-07-21 4:59 ` Darrick J. Wong 2016-07-21 5:00 ` [PATCH 36/47] xfs: convert unwritten status of reverse mappings Darrick J. Wong 2016-07-21 5:00 ` Darrick J. Wong 2016-08-03 2:00 ` Dave Chinner 2016-08-03 2:00 ` Dave Chinner 2016-07-21 5:00 ` [PATCH 37/47] xfs: add rmap btree insert and delete helpers Darrick J. Wong 2016-07-21 5:00 ` Darrick J. Wong 2016-07-21 5:00 ` [PATCH 38/47] xfs: create rmap update intent log items Darrick J. Wong 2016-07-21 5:00 ` Darrick J. Wong 2016-08-01 7:12 ` Christoph Hellwig 2016-08-01 7:12 ` Christoph Hellwig 2016-08-01 18:08 ` Darrick J. Wong 2016-08-01 18:08 ` Darrick J. Wong 2016-07-21 5:00 ` [PATCH 39/47] xfs: log rmap intent items Darrick J. Wong 2016-07-21 5:00 ` Darrick J. Wong 2016-07-21 5:00 ` [PATCH 40/47] xfs: enable the xfs_defer mechanism to process rmaps to update Darrick J. Wong 2016-07-21 5:00 ` Darrick J. Wong 2016-07-21 5:00 ` [PATCH 41/47] xfs: propagate bmap updates to rmapbt Darrick J. Wong 2016-07-21 5:00 ` Darrick J. Wong 2016-07-21 5:00 ` [PATCH 42/47] xfs: add rmap btree geometry feature flag Darrick J. Wong 2016-07-21 5:00 ` Darrick J. Wong 2016-07-21 5:00 ` [PATCH 43/47] xfs: add rmap btree block detection to log recovery Darrick J. Wong 2016-07-21 5:00 ` Darrick J. Wong 2016-07-21 5:00 ` [PATCH 44/47] xfs: disable XFS_IOC_SWAPEXT when rmap btree is enabled Darrick J. Wong 2016-07-21 5:00 ` Darrick J. Wong 2016-07-21 5:01 ` [PATCH 45/47] xfs: don't update rmapbt when fixing agfl Darrick J. Wong 2016-07-21 5:01 ` Darrick J. Wong 2016-07-21 5:01 ` [PATCH 46/47] xfs: enable the rmap btree functionality Darrick J. Wong 2016-07-21 5:01 ` Darrick J. Wong 2016-07-21 5:01 ` [PATCH 47/47] xfs: introduce the XFS_IOC_GETFSMAP ioctl Darrick J. Wong 2016-07-21 5:01 ` Darrick J. Wong 2016-07-23 4:28 ` [PATCH v2 " Darrick J. Wong 2016-07-23 4:28 ` Darrick J. Wong 2016-08-03 19:45 ` [PATCH v7 00/47] xfs: add reverse mapping support Mark Fasheh 2016-08-03 19:45 ` Mark Fasheh 2016-08-03 20:55 ` Darrick J. Wong 2016-08-03 20:55 ` Darrick J. Wong 2016-08-04 0:58 ` Darrick J. Wong 2016-08-04 0:58 ` Darrick J. Wong 2016-08-04 2:18 ` Mark Fasheh 2016-08-04 2:18 ` Mark Fasheh 2016-08-04 15:48 ` Darrick J. Wong 2016-08-04 15:48 ` Darrick J. Wong 2016-08-04 23:50 ` Dave Chinner 2016-08-04 23:50 ` Dave Chinner 2016-08-05 0:49 ` Darrick J. Wong 2016-08-05 0:49 ` Darrick J. Wong 2016-08-05 7:01 ` Artem Bityutskiy 2016-08-05 7:01 ` Artem Bityutskiy 2016-08-05 7:22 ` Darrick J. Wong 2016-08-05 7:22 ` Darrick J. Wong 2016-08-05 10:49 ` Dave Chinner 2016-08-05 10:49 ` Dave Chinner 2016-08-05 11:57 ` Artem Bityutskiy 2016-08-05 11:57 ` Artem Bityutskiy 2016-08-05 22:26 ` Dave Chinner 2016-08-05 22:26 ` Dave Chinner 2016-08-05 18:36 ` Mark Fasheh 2016-08-05 18:36 ` Mark Fasheh 2016-08-05 22:39 ` Dave Chinner 2016-08-05 22:39 ` Dave Chinner
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