From 0b44aa85b50548e6ef1b2dd1424aadc6b69bff24 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Thu, 11 May 2017 14:01:08 -0500 Subject: [PATCH] xfs: introduce xfs_bmapi_remap Source kernel commit: 6ebd5a4413e2afd1b1129135e1cf4a84092550e2 Add a new helper to be used for reflink extent list additions instead of funneling them through xfs_bmapi_write and overloading the firstblock member in struct xfs_bmalloca and struct xfs_alloc_args. With some small changes to xfs_bmap_remap_alloc this also means we do not need a xfs_bmalloca structure for this case at all. Signed-off-by: Christoph Hellwig Reviewed-by: Darrick J. Wong Signed-off-by: Darrick J. Wong Signed-off-by: Eric Sandeen --- libxfs/xfs_bmap.c | 157 +++++++++++++++++++++++++++++++++------------- 1 file changed, 112 insertions(+), 45 deletions(-) diff --git a/libxfs/xfs_bmap.c b/libxfs/xfs_bmap.c index 6ff897e72..c86bfc4eb 100644 --- a/libxfs/xfs_bmap.c +++ b/libxfs/xfs_bmap.c @@ -3853,11 +3853,12 @@ xfs_bmap_btalloc( */ STATIC int xfs_bmap_remap_alloc( - struct xfs_bmalloca *ap) + struct xfs_trans *tp, + struct xfs_inode *ip, + xfs_fsblock_t startblock, + xfs_extlen_t length) { - struct xfs_trans *tp = ap->tp; struct xfs_mount *mp = tp->t_mountp; - xfs_fsblock_t bno; struct xfs_alloc_arg args; int error; @@ -3866,24 +3867,24 @@ xfs_bmap_remap_alloc( * 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); - args.agbno = XFS_FSB_TO_AGBNO(mp, bno); + args.tp = tp; + args.mp = mp; + args.agno = XFS_FSB_TO_AGNO(mp, startblock); + args.agbno = XFS_FSB_TO_AGBNO(mp, startblock); + if (args.agno >= mp->m_sb.sb_agcount || args.agbno >= mp->m_sb.sb_agblocks) return -EFSCORRUPTED; /* "Allocate" the extent from the range we passed in. */ - trace_xfs_bmap_remap_alloc(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); + trace_xfs_bmap_remap_alloc(ip, startblock, length); + + ip->i_d.di_nblocks += length; + xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); /* Fix the freelist, like a real allocator does. */ - args.datatype = ap->datatype; - args.pag = xfs_perag_get(args.mp, args.agno); + args.datatype = XFS_ALLOC_USERDATA | XFS_ALLOC_NOBUSY; + args.pag = xfs_perag_get(mp, args.agno); ASSERT(args.pag); /* @@ -3896,7 +3897,7 @@ xfs_bmap_remap_alloc( error = xfs_alloc_fix_freelist(&args, XFS_ALLOC_FLAG_FREEING); xfs_perag_put(args.pag); if (error) - trace_xfs_bmap_remap_alloc_error(ap->ip, error, _RET_IP_); + trace_xfs_bmap_remap_alloc_error(ip, error, _RET_IP_); return error; } @@ -3908,8 +3909,6 @@ STATIC int xfs_bmap_alloc( struct xfs_bmalloca *ap) /* bmap alloc argument struct */ { - if (ap->flags & XFS_BMAPI_REMAP) - return xfs_bmap_remap_alloc(ap); if (XFS_IS_REALTIME_INODE(ap->ip) && xfs_alloc_is_userdata(ap->datatype)) return xfs_bmap_rtalloc(ap); @@ -4545,9 +4544,7 @@ xfs_bmapi_write( ASSERT(len > 0); ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL); ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); - ASSERT(!(flags & XFS_BMAPI_REMAP) || whichfork == XFS_DATA_FORK); - ASSERT(!(flags & XFS_BMAPI_PREALLOC) || !(flags & XFS_BMAPI_REMAP)); - ASSERT(!(flags & XFS_BMAPI_CONVERT) || !(flags & XFS_BMAPI_REMAP)); + ASSERT(!(flags & XFS_BMAPI_REMAP)); /* zeroing is for currently only for data extents, not metadata */ ASSERT((flags & (XFS_BMAPI_METADATA | XFS_BMAPI_ZERO)) != @@ -4631,13 +4628,8 @@ xfs_bmapi_write( } else { need_alloc = true; } - } else { - /* - * Make sure we only reflink into a hole. - */ - ASSERT(!(flags & XFS_BMAPI_REMAP)); - if (isnullstartblock(bma.got.br_startblock)) - wasdelay = true; + } else if (isnullstartblock(bma.got.br_startblock)) { + wasdelay = true; } /* @@ -4766,6 +4758,94 @@ error0: return error; } +static int +xfs_bmapi_remap( + struct xfs_trans *tp, + struct xfs_inode *ip, + xfs_fileoff_t bno, + xfs_filblks_t len, + xfs_fsblock_t startblock, + struct xfs_defer_ops *dfops) +{ + struct xfs_mount *mp = ip->i_mount; + struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK); + struct xfs_btree_cur *cur = NULL; + xfs_fsblock_t firstblock = NULLFSBLOCK; + struct xfs_bmbt_irec got; + xfs_extnum_t idx; + int logflags = 0, error; + + ASSERT(len > 0); + ASSERT(len <= (xfs_filblks_t)MAXEXTLEN); + ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); + + if (unlikely(XFS_TEST_ERROR( + (XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_EXTENTS && + XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_BTREE), + mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) { + XFS_ERROR_REPORT("xfs_bmapi_remap", XFS_ERRLEVEL_LOW, mp); + return -EFSCORRUPTED; + } + + if (XFS_FORCED_SHUTDOWN(mp)) + return -EIO; + + if (!(ifp->if_flags & XFS_IFEXTENTS)) { + error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK); + if (error) + return error; + } + + if (xfs_iext_lookup_extent(ip, ifp, bno, &idx, &got)) { + /* make sure we only reflink into a hole. */ + ASSERT(got.br_startoff > bno); + ASSERT(got.br_startoff - bno >= len); + } + + error = xfs_bmap_remap_alloc(tp, ip, startblock, len); + if (error) + goto error0; + + if (ifp->if_flags & XFS_IFBROOT) { + cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK); + cur->bc_private.b.firstblock = firstblock; + cur->bc_private.b.dfops = dfops; + cur->bc_private.b.flags = 0; + } + + got.br_startoff = bno; + got.br_startblock = startblock; + got.br_blockcount = len; + got.br_state = XFS_EXT_NORM; + + error = xfs_bmap_add_extent_hole_real(tp, ip, XFS_DATA_FORK, &idx, &cur, + &got, &firstblock, dfops, &logflags); + if (error) + goto error0; + + if (xfs_bmap_wants_extents(ip, XFS_DATA_FORK)) { + int tmp_logflags = 0; + + error = xfs_bmap_btree_to_extents(tp, ip, cur, + &tmp_logflags, XFS_DATA_FORK); + logflags |= tmp_logflags; + } + +error0: + if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) + logflags &= ~XFS_ILOG_DEXT; + else if (ip->i_d.di_format != XFS_DINODE_FMT_BTREE) + logflags &= ~XFS_ILOG_DBROOT; + + if (logflags) + xfs_trans_log_inode(tp, ip, logflags); + if (cur) { + xfs_btree_del_cursor(cur, + error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR); + } + return error; +} + /* * When a delalloc extent is split (e.g., due to a hole punch), the original * indlen reservation must be shared across the two new extents that are left @@ -6484,16 +6564,7 @@ xfs_bmap_finish_one( xfs_filblks_t blockcount, xfs_exntst_t state) { - struct xfs_bmbt_irec bmap; - int nimaps = 1; - xfs_fsblock_t firstfsb; - int done; - int error = 0; - - bmap.br_startblock = startblock; - bmap.br_startoff = startoff; - bmap.br_blockcount = blockcount; - bmap.br_state = state; + int error = 0, done; trace_xfs_bmap_deferred(tp->t_mountp, XFS_FSB_TO_AGNO(tp->t_mountp, startblock), type, @@ -6510,16 +6581,12 @@ xfs_bmap_finish_one( switch (type) { case XFS_BMAP_MAP: - firstfsb = bmap.br_startblock; - error = xfs_bmapi_write(tp, ip, bmap.br_startoff, - bmap.br_blockcount, XFS_BMAPI_REMAP, &firstfsb, - bmap.br_blockcount, &bmap, &nimaps, - dfops); + error = xfs_bmapi_remap(tp, ip, startoff, blockcount, + startblock, dfops); break; case XFS_BMAP_UNMAP: - error = xfs_bunmapi(tp, ip, bmap.br_startoff, - bmap.br_blockcount, XFS_BMAPI_REMAP, 1, &firstfsb, - dfops, &done); + error = xfs_bunmapi(tp, ip, startoff, blockcount, + XFS_BMAPI_REMAP, 1, &startblock, dfops, &done); ASSERT(done); break; default: -- 2.39.5