From: "Darrick J. Wong" <darrick.wong@oracle.com> To: david@fromorbit.com, darrick.wong@oracle.com Cc: linux-fsdevel@vger.kernel.org, xfs@oss.sgi.com Subject: [PATCH 43/58] xfs: map an inode's offset to an exact physical block Date: Tue, 06 Oct 2015 21:59:52 -0700 [thread overview] Message-ID: <20151007045952.30457.35484.stgit@birch.djwong.org> (raw) In-Reply-To: <20151007045443.30457.47038.stgit@birch.djwong.org> Teach the bmap routine to know how to map a range of file blocks to a specific range of physical blocks, instead of simply allocating fresh blocks. This enables reflink to map a file to blocks that are already in use. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> --- fs/xfs/libxfs/xfs_bmap.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++ fs/xfs/libxfs/xfs_bmap.h | 9 ++++++ 2 files changed, 72 insertions(+), 1 deletion(-) diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index f6812ba..5f457b4 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -4003,6 +4003,56 @@ xfs_bmap_btalloc( } /* + * For a remap operation, just "allocate" an extent at the address that the + * caller passed in, and ensure that the AGFL is the right size. The caller + * will then map the "allocated" extent into the file somewhere. + */ +static int +xfs_bmap_remap( + struct xfs_bmalloca *ap) +{ + struct xfs_trans *tp = ap->tp; + struct xfs_mount *mp = tp->t_mountp; + xfs_agblock_t bno; + struct xfs_alloc_arg args; + int error; + + /* + * validate that the block number is legal - the enables us to detect + * and handle a silent filesystem corruption rather than crashing. + */ + memset(&args, 0, sizeof(struct xfs_alloc_arg)); + args.tp = ap->tp; + args.mp = ap->tp->t_mountp; + bno = *ap->firstblock; + args.agno = XFS_FSB_TO_AGNO(mp, bno); + if (args.agno >= mp->m_sb.sb_agcount) + return -EFSCORRUPTED; + + args.agbno = XFS_FSB_TO_AGBNO(mp, bno); + if (args.agbno >= mp->m_sb.sb_agblocks) + return -EFSCORRUPTED; + + /* "Allocate" the extent from the range we passed in. */ + trace_xfs_reflink_relink_blocks(ap->ip, *ap->firstblock, + ap->length); + ap->blkno = bno; + ap->ip->i_d.di_nblocks += ap->length; + xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE); + + /* Fix the freelist, like a real allocator does. */ + + args.pag = xfs_perag_get(args.mp, args.agno); + ASSERT(args.pag); + + error = xfs_alloc_fix_freelist(&args, XFS_ALLOC_FLAG_FREEING); + if (error) + goto error0; +error0: + xfs_perag_put(args.pag); + return error; +} +/* * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file. * It figures out where to ask the underlying allocator to put the new extent. */ @@ -4010,6 +4060,8 @@ STATIC int xfs_bmap_alloc( struct xfs_bmalloca *ap) /* bmap alloc argument struct */ { + if (ap->flags & XFS_BMAPI_REMAP) + return xfs_bmap_remap(ap); if (XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata) return xfs_bmap_rtalloc(ap); return xfs_bmap_btalloc(ap); @@ -4694,6 +4746,12 @@ xfs_bmapi_write( ASSERT(len > 0); ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL); ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); + if (whichfork == XFS_ATTR_FORK) + ASSERT(!(flags & XFS_BMAPI_REMAP)); + if (flags & XFS_BMAPI_REMAP) { + ASSERT(!(flags & XFS_BMAPI_PREALLOC)); + ASSERT(!(flags & XFS_BMAPI_CONVERT)); + } if (unlikely(XFS_TEST_ERROR( (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS && @@ -4743,6 +4801,12 @@ xfs_bmapi_write( wasdelay = !inhole && isnullstartblock(bma.got.br_startblock); /* + * Make sure we only reflink into a hole. + */ + if (flags & XFS_BMAPI_REMAP) + ASSERT(inhole); + + /* * First, deal with the hole before the allocated space * that we found, if any. */ diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h index 59f26cf..78a56b69 100644 --- a/fs/xfs/libxfs/xfs_bmap.h +++ b/fs/xfs/libxfs/xfs_bmap.h @@ -110,6 +110,12 @@ typedef struct xfs_bmap_free * from written to unwritten, otherwise convert from unwritten to written. */ #define XFS_BMAPI_CONVERT 0x040 +/* + * Map the inode offset to the block given in ap->firstblock. Primarily + * used for reflink. The range must be in a hole, and this flag cannot be + * turned on with PREALLOC or CONVERT, and cannot be used on the attr fork. + */ +#define XFS_BMAPI_REMAP 0x100 #define XFS_BMAPI_FLAGS \ { XFS_BMAPI_ENTIRE, "ENTIRE" }, \ @@ -118,7 +124,8 @@ typedef struct xfs_bmap_free { XFS_BMAPI_PREALLOC, "PREALLOC" }, \ { XFS_BMAPI_IGSTATE, "IGSTATE" }, \ { XFS_BMAPI_CONTIG, "CONTIG" }, \ - { XFS_BMAPI_CONVERT, "CONVERT" } + { XFS_BMAPI_CONVERT, "CONVERT" }, \ + { XFS_BMAPI_REMAP, "REMAP" } static inline int xfs_bmapi_aflag(int w)
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, xfs@oss.sgi.com Subject: [PATCH 43/58] xfs: map an inode's offset to an exact physical block Date: Tue, 06 Oct 2015 21:59:52 -0700 [thread overview] Message-ID: <20151007045952.30457.35484.stgit@birch.djwong.org> (raw) In-Reply-To: <20151007045443.30457.47038.stgit@birch.djwong.org> Teach the bmap routine to know how to map a range of file blocks to a specific range of physical blocks, instead of simply allocating fresh blocks. This enables reflink to map a file to blocks that are already in use. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> --- fs/xfs/libxfs/xfs_bmap.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++ fs/xfs/libxfs/xfs_bmap.h | 9 ++++++ 2 files changed, 72 insertions(+), 1 deletion(-) diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index f6812ba..5f457b4 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -4003,6 +4003,56 @@ xfs_bmap_btalloc( } /* + * For a remap operation, just "allocate" an extent at the address that the + * caller passed in, and ensure that the AGFL is the right size. The caller + * will then map the "allocated" extent into the file somewhere. + */ +static int +xfs_bmap_remap( + struct xfs_bmalloca *ap) +{ + struct xfs_trans *tp = ap->tp; + struct xfs_mount *mp = tp->t_mountp; + xfs_agblock_t bno; + struct xfs_alloc_arg args; + int error; + + /* + * validate that the block number is legal - the enables us to detect + * and handle a silent filesystem corruption rather than crashing. + */ + memset(&args, 0, sizeof(struct xfs_alloc_arg)); + args.tp = ap->tp; + args.mp = ap->tp->t_mountp; + bno = *ap->firstblock; + args.agno = XFS_FSB_TO_AGNO(mp, bno); + if (args.agno >= mp->m_sb.sb_agcount) + return -EFSCORRUPTED; + + args.agbno = XFS_FSB_TO_AGBNO(mp, bno); + if (args.agbno >= mp->m_sb.sb_agblocks) + return -EFSCORRUPTED; + + /* "Allocate" the extent from the range we passed in. */ + trace_xfs_reflink_relink_blocks(ap->ip, *ap->firstblock, + ap->length); + ap->blkno = bno; + ap->ip->i_d.di_nblocks += ap->length; + xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE); + + /* Fix the freelist, like a real allocator does. */ + + args.pag = xfs_perag_get(args.mp, args.agno); + ASSERT(args.pag); + + error = xfs_alloc_fix_freelist(&args, XFS_ALLOC_FLAG_FREEING); + if (error) + goto error0; +error0: + xfs_perag_put(args.pag); + return error; +} +/* * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file. * It figures out where to ask the underlying allocator to put the new extent. */ @@ -4010,6 +4060,8 @@ STATIC int xfs_bmap_alloc( struct xfs_bmalloca *ap) /* bmap alloc argument struct */ { + if (ap->flags & XFS_BMAPI_REMAP) + return xfs_bmap_remap(ap); if (XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata) return xfs_bmap_rtalloc(ap); return xfs_bmap_btalloc(ap); @@ -4694,6 +4746,12 @@ xfs_bmapi_write( ASSERT(len > 0); ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL); ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); + if (whichfork == XFS_ATTR_FORK) + ASSERT(!(flags & XFS_BMAPI_REMAP)); + if (flags & XFS_BMAPI_REMAP) { + ASSERT(!(flags & XFS_BMAPI_PREALLOC)); + ASSERT(!(flags & XFS_BMAPI_CONVERT)); + } if (unlikely(XFS_TEST_ERROR( (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS && @@ -4743,6 +4801,12 @@ xfs_bmapi_write( wasdelay = !inhole && isnullstartblock(bma.got.br_startblock); /* + * Make sure we only reflink into a hole. + */ + if (flags & XFS_BMAPI_REMAP) + ASSERT(inhole); + + /* * First, deal with the hole before the allocated space * that we found, if any. */ diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h index 59f26cf..78a56b69 100644 --- a/fs/xfs/libxfs/xfs_bmap.h +++ b/fs/xfs/libxfs/xfs_bmap.h @@ -110,6 +110,12 @@ typedef struct xfs_bmap_free * from written to unwritten, otherwise convert from unwritten to written. */ #define XFS_BMAPI_CONVERT 0x040 +/* + * Map the inode offset to the block given in ap->firstblock. Primarily + * used for reflink. The range must be in a hole, and this flag cannot be + * turned on with PREALLOC or CONVERT, and cannot be used on the attr fork. + */ +#define XFS_BMAPI_REMAP 0x100 #define XFS_BMAPI_FLAGS \ { XFS_BMAPI_ENTIRE, "ENTIRE" }, \ @@ -118,7 +124,8 @@ typedef struct xfs_bmap_free { XFS_BMAPI_PREALLOC, "PREALLOC" }, \ { XFS_BMAPI_IGSTATE, "IGSTATE" }, \ { XFS_BMAPI_CONTIG, "CONTIG" }, \ - { XFS_BMAPI_CONVERT, "CONVERT" } + { XFS_BMAPI_CONVERT, "CONVERT" }, \ + { XFS_BMAPI_REMAP, "REMAP" } static inline int xfs_bmapi_aflag(int w) _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs
next prev parent reply other threads:[~2015-10-07 4:59 UTC|newest] Thread overview: 131+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-10-07 4:54 [RFCv3 00/58] xfs: add reverse-mapping, reflink, and dedupe support Darrick J. Wong 2015-10-07 4:54 ` Darrick J. Wong 2015-10-07 4:54 ` [PATCH 01/58] libxfs: make xfs_alloc_fix_freelist non-static Darrick J. Wong 2015-10-07 4:54 ` Darrick J. Wong 2015-10-07 4:54 ` [PATCH 02/58] xfs: fix log ticket type printing Darrick J. Wong 2015-10-07 4:54 ` Darrick J. Wong 2015-10-07 4:55 ` [PATCH 03/58] xfs: introduce rmap btree definitions Darrick J. Wong 2015-10-07 4:55 ` Darrick J. Wong 2015-10-07 4:55 ` [PATCH 04/58] xfs: add rmap btree stats infrastructure Darrick J. Wong 2015-10-07 4:55 ` [PATCH 05/58] xfs: rmap btree add more reserved blocks Darrick J. Wong 2015-10-07 4:55 ` Darrick J. Wong 2015-10-07 4:55 ` [PATCH 06/58] xfs: add owner field to extent allocation and freeing Darrick J. Wong 2015-10-07 4:55 ` Darrick J. Wong 2015-10-07 4:55 ` [PATCH 07/58] xfs: add extended " Darrick J. Wong 2015-10-07 4:55 ` Darrick J. Wong 2015-10-07 4:55 ` [PATCH 08/58] xfs: introduce rmap extent operation stubs Darrick J. Wong 2015-10-07 4:55 ` Darrick J. Wong 2015-10-07 4:55 ` [PATCH 09/58] xfs: extend rmap extent operation stubs to take full owner info Darrick J. Wong 2015-10-07 4:55 ` Darrick J. Wong 2015-10-07 4:55 ` [PATCH 10/58] xfs: define the on-disk rmap btree format Darrick J. Wong 2015-10-07 4:55 ` Darrick J. Wong 2015-10-07 4:55 ` [PATCH 11/58] xfs: enhance " Darrick J. Wong 2015-10-07 4:55 ` Darrick J. Wong 2015-10-07 4:56 ` [PATCH 12/58] xfs: add rmap btree growfs support Darrick J. Wong 2015-10-07 4:56 ` Darrick J. Wong 2015-10-07 4:56 ` [PATCH 13/58] xfs: enhance " Darrick J. Wong 2015-10-07 4:56 ` Darrick J. Wong 2015-10-07 4:56 ` [PATCH 14/58] xfs: rmap btree transaction reservations Darrick J. Wong 2015-10-07 4:56 ` Darrick J. Wong 2015-10-07 4:56 ` [PATCH 15/58] xfs: rmap btree requires more reserved free space Darrick J. Wong 2015-10-07 4:56 ` Darrick J. Wong 2015-10-07 4:56 ` [PATCH 16/58] libxfs: fix min freelist length calculation Darrick J. Wong 2015-10-07 4:56 ` Darrick J. Wong 2015-10-07 4:56 ` [PATCH 17/58] xfs: add rmap btree operations Darrick J. Wong 2015-10-07 4:57 ` [PATCH 18/58] xfs: enhance " Darrick J. Wong 2015-10-07 4:57 ` [PATCH 19/58] xfs: add an extent to the rmap btree Darrick J. Wong 2015-10-07 4:57 ` Darrick J. Wong 2015-10-07 4:57 ` [PATCH 20/58] xfs: add tracepoints for the rmap-mirrors-bmbt functions Darrick J. Wong 2015-10-07 4:57 ` Darrick J. Wong 2015-10-07 4:57 ` [PATCH 21/58] xfs: teach rmap_alloc how to deal with our larger rmap btree Darrick J. Wong 2015-10-07 4:57 ` Darrick J. Wong 2015-10-07 4:57 ` [PATCH 22/58] xfs: remove an extent from the " Darrick J. Wong 2015-10-07 4:57 ` Darrick J. Wong 2015-10-07 4:57 ` [PATCH 23/58] xfs: enhanced " Darrick J. Wong 2015-10-07 4:57 ` Darrick J. Wong 2015-10-07 4:57 ` [PATCH 24/58] xfs: add rmap btree insert and delete helpers Darrick J. Wong 2015-10-07 4:57 ` Darrick J. Wong 2015-10-07 4:57 ` [PATCH 25/58] xfs: bmap btree changes should update rmap btree Darrick J. Wong 2015-10-07 4:57 ` Darrick J. Wong 2015-10-21 21:39 ` Darrick J. Wong 2015-10-21 21:39 ` Darrick J. Wong 2015-10-07 4:57 ` [PATCH 26/58] xfs: add rmap btree geometry feature flag Darrick J. Wong 2015-10-07 4:57 ` Darrick J. Wong 2015-10-07 4:58 ` [PATCH 27/58] xfs: add rmap btree block detection to log recovery Darrick J. Wong 2015-10-07 4:58 ` Darrick J. Wong 2015-10-07 4:58 ` [PATCH 28/58] xfs: enable the rmap btree functionality Darrick J. Wong 2015-10-07 4:58 ` Darrick J. Wong 2015-10-07 4:58 ` [PATCH 29/58] xfs: disable XFS_IOC_SWAPEXT when rmap btree is enabled Darrick J. Wong 2015-10-07 4:58 ` Darrick J. Wong 2015-10-07 4:58 ` [PATCH 30/58] xfs: implement " Darrick J. Wong 2015-10-07 4:58 ` Darrick J. Wong 2015-10-07 4:58 ` [PATCH 31/58] libxfs: refactor short btree block verification Darrick J. Wong 2015-10-07 4:58 ` Darrick J. Wong 2015-10-07 4:58 ` [PATCH 32/58] xfs: don't update rmapbt when fixing agfl Darrick J. Wong 2015-10-07 4:58 ` Darrick J. Wong 2015-10-07 4:58 ` [PATCH 33/58] xfs: introduce refcount btree definitions Darrick J. Wong 2015-10-07 4:58 ` Darrick J. Wong 2015-10-07 4:58 ` [PATCH 34/58] xfs: add refcount btree stats infrastructure Darrick J. Wong 2015-10-07 4:58 ` Darrick J. Wong 2015-10-07 4:58 ` [PATCH 35/58] xfs: refcount btree add more reserved blocks Darrick J. Wong 2015-10-07 4:58 ` Darrick J. Wong 2015-10-07 4:59 ` [PATCH 36/58] xfs: define the on-disk refcount btree format Darrick J. Wong 2015-10-07 4:59 ` Darrick J. Wong 2015-10-07 4:59 ` [PATCH 37/58] xfs: define tracepoints for refcount/reflink activities Darrick J. Wong 2015-10-07 4:59 ` Darrick J. Wong 2015-10-07 4:59 ` [PATCH 38/58] xfs: add refcount btree support to growfs Darrick J. Wong 2015-10-07 4:59 ` Darrick J. Wong 2015-10-07 4:59 ` [PATCH 39/58] xfs: add refcount btree operations Darrick J. Wong 2015-10-07 4:59 ` Darrick J. Wong 2015-10-07 4:59 ` [PATCH 40/58] libxfs: adjust refcount of an extent of blocks in refcount btree Darrick J. Wong 2015-10-07 4:59 ` Darrick J. Wong 2015-10-27 19:05 ` Darrick J. Wong 2015-10-27 19:05 ` Darrick J. Wong 2015-10-30 20:56 ` Darrick J. Wong 2015-10-30 20:56 ` Darrick J. Wong 2015-10-07 4:59 ` [PATCH 41/58] libxfs: adjust refcount when unmapping file blocks Darrick J. Wong 2015-10-07 4:59 ` Darrick J. Wong 2015-10-07 4:59 ` [PATCH 42/58] xfs: add refcount btree block detection to log recovery Darrick J. Wong 2015-10-07 4:59 ` Darrick J. Wong 2015-10-07 4:59 ` Darrick J. Wong [this message] 2015-10-07 4:59 ` [PATCH 43/58] xfs: map an inode's offset to an exact physical block Darrick J. Wong 2015-10-07 4:59 ` [PATCH 44/58] xfs: add reflink feature flag to geometry Darrick J. Wong 2015-10-07 4:59 ` Darrick J. Wong 2015-10-07 5:00 ` [PATCH 45/58] xfs: create a separate workqueue for copy-on-write activities Darrick J. Wong 2015-10-07 5:00 ` Darrick J. Wong 2015-10-07 5:00 ` [PATCH 46/58] xfs: implement copy-on-write for reflinked blocks Darrick J. Wong 2015-10-07 5:00 ` Darrick J. Wong 2015-10-07 5:00 ` [PATCH 47/58] xfs: handle directio " Darrick J. Wong 2015-10-07 5:00 ` Darrick J. Wong 2015-10-07 5:00 ` [PATCH 48/58] xfs: copy-on-write reflinked blocks when zeroing ranges of blocks Darrick J. Wong 2015-10-07 5:00 ` Darrick J. Wong 2015-10-21 21:17 ` Darrick J. Wong 2015-10-21 21:17 ` Darrick J. Wong 2015-10-07 5:00 ` [PATCH 49/58] xfs: clear inode reflink flag when freeing blocks Darrick J. Wong 2015-10-07 5:00 ` Darrick J. Wong 2015-10-07 5:00 ` [PATCH 50/58] xfs: reflink extents from one file to another Darrick J. Wong 2015-10-07 5:00 ` Darrick J. Wong 2015-10-07 5:12 ` kbuild test robot 2015-10-07 5:12 ` kbuild test robot 2015-10-07 5:00 ` [PATCH 51/58] xfs: add clone file and clone range ioctls Darrick J. Wong 2015-10-07 5:00 ` Darrick J. Wong 2015-10-07 5:13 ` kbuild test robot 2015-10-07 5:13 ` kbuild test robot 2015-10-07 6:46 ` kbuild test robot 2015-10-07 6:46 ` kbuild test robot 2015-10-07 7:35 ` kbuild test robot 2015-10-07 7:35 ` kbuild test robot 2015-10-07 5:00 ` [PATCH 52/58] xfs: emulate the btrfs dedupe extent same ioctl Darrick J. Wong 2015-10-07 5:00 ` Darrick J. Wong 2015-10-07 5:00 ` [PATCH 53/58] xfs: teach fiemap about reflink'd extents Darrick J. Wong 2015-10-07 5:00 ` Darrick J. Wong 2015-10-07 5:01 ` [PATCH 54/58] xfs: swap inode reflink flags when swapping inode extents Darrick J. Wong 2015-10-07 5:01 ` Darrick J. Wong 2015-10-07 5:01 ` [PATCH 55/58] vfs: add a FALLOC_FL_UNSHARE mode to fallocate to unshare a range of blocks Darrick J. Wong 2015-10-07 5:01 ` Darrick J. Wong 2015-10-07 5:01 ` [PATCH 56/58] xfs: unshare a range of blocks via fallocate Darrick J. Wong 2015-10-07 5:01 ` Darrick J. Wong 2015-10-07 5:01 ` [PATCH 57/58] xfs: support XFS_XFLAG_REFLINK (and FS_NOCOW_FL) on reflink filesystems Darrick J. Wong 2015-10-07 5:01 ` Darrick J. Wong 2015-10-07 5:01 ` [PATCH 58/58] xfs: recognize the reflink feature bit Darrick J. Wong 2015-10-07 5:01 ` Darrick J. Wong
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