Allow the creation of delayed allocation extents in the CoW fork. In a subsequent patch we'll wire up write_begin and page_mkwrite to actually do this. Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx> --- fs/xfs/libxfs/xfs_bmap.c | 29 +++++++++++++++++----------- fs/xfs/libxfs/xfs_bmap.h | 2 +- fs/xfs/xfs_iomap.c | 48 +++++++++++++++++++++++++++++++++++++--------- fs/xfs/xfs_iomap.h | 2 ++ 4 files changed, 60 insertions(+), 21 deletions(-) diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index 53a8ebc..9737353 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -2878,6 +2878,7 @@ done: STATIC void xfs_bmap_add_extent_hole_delay( xfs_inode_t *ip, /* incore inode pointer */ + int whichfork, xfs_extnum_t *idx, /* extent number to update/insert */ xfs_bmbt_irec_t *new) /* new data to add to file extents */ { @@ -2889,8 +2890,10 @@ xfs_bmap_add_extent_hole_delay( int state; /* state bits, accessed thru macros */ xfs_filblks_t temp=0; /* temp for indirect calculations */ - ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK); + ifp = XFS_IFORK_PTR(ip, whichfork); state = 0; + if (whichfork == XFS_COW_FORK) + state |= BMAP_COWFORK; ASSERT(isnullstartblock(new->br_startblock)); /* @@ -2908,7 +2911,7 @@ xfs_bmap_add_extent_hole_delay( * Check and set flags if the current (right) segment exists. * If it doesn't exist, we're converting the hole at end-of-file. */ - if (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) { + if (*idx < ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) { state |= BMAP_RIGHT_VALID; xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx), &right); @@ -4260,6 +4263,7 @@ xfs_bmapi_read( STATIC int xfs_bmapi_reserve_delalloc( struct xfs_inode *ip, + int whichfork, xfs_fileoff_t aoff, xfs_filblks_t len, struct xfs_bmbt_irec *got, @@ -4268,7 +4272,7 @@ xfs_bmapi_reserve_delalloc( int eof) { struct xfs_mount *mp = ip->i_mount; - struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK); + struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork); xfs_extlen_t alen; xfs_extlen_t indlen; char rt = XFS_IS_REALTIME_INODE(ip); @@ -4327,7 +4331,7 @@ xfs_bmapi_reserve_delalloc( got->br_startblock = nullstartblock(indlen); got->br_blockcount = alen; got->br_state = XFS_EXT_NORM; - xfs_bmap_add_extent_hole_delay(ip, lastx, got); + xfs_bmap_add_extent_hole_delay(ip, whichfork, lastx, got); /* * Update our extent pointer, given that xfs_bmap_add_extent_hole_delay @@ -4359,6 +4363,7 @@ out_unreserve_quota: int xfs_bmapi_delay( struct xfs_inode *ip, /* incore inode */ + int whichfork, /* data or cow fork? */ xfs_fileoff_t bno, /* starting file offs. mapped */ xfs_filblks_t len, /* length to map in file */ struct xfs_bmbt_irec *mval, /* output: map values */ @@ -4366,7 +4371,7 @@ xfs_bmapi_delay( int flags) /* XFS_BMAPI_... */ { struct xfs_mount *mp = ip->i_mount; - struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK); + struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork); struct xfs_bmbt_irec got; /* current file extent record */ struct xfs_bmbt_irec prev; /* previous file extent record */ xfs_fileoff_t obno; /* old block number (offset) */ @@ -4376,14 +4381,15 @@ xfs_bmapi_delay( int n = 0; /* current extent index */ int error = 0; + ASSERT(whichfork == XFS_DATA_FORK || whichfork == XFS_COW_FORK); ASSERT(*nmap >= 1); ASSERT(*nmap <= XFS_BMAP_MAX_NMAP); ASSERT(!(flags & ~XFS_BMAPI_ENTIRE)); 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), + (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS && + XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE), mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) { XFS_ERROR_REPORT("xfs_bmapi_delay", XFS_ERRLEVEL_LOW, mp); return -EFSCORRUPTED; @@ -4394,19 +4400,20 @@ xfs_bmapi_delay( XFS_STATS_INC(mp, xs_blk_mapw); - if (!(ifp->if_flags & XFS_IFEXTENTS)) { - error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK); + if (whichfork == XFS_DATA_FORK && !(ifp->if_flags & XFS_IFEXTENTS)) { + error = xfs_iread_extents(NULL, ip, whichfork); if (error) return error; } - xfs_bmap_search_extents(ip, bno, XFS_DATA_FORK, &eof, &lastx, &got, &prev); + xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got, &prev); end = bno + len; obno = bno; while (bno < end && n < *nmap) { if (eof || got.br_startoff > bno) { - error = xfs_bmapi_reserve_delalloc(ip, bno, len, &got, + error = xfs_bmapi_reserve_delalloc(ip, whichfork, + bno, len, &got, &prev, &lastx, eof); if (error) { if (n == 0) { diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h index 2c18ed8a..fb68ac4 100644 --- a/fs/xfs/libxfs/xfs_bmap.h +++ b/fs/xfs/libxfs/xfs_bmap.h @@ -245,7 +245,7 @@ int xfs_bmap_read_extents(struct xfs_trans *tp, struct xfs_inode *ip, int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno, xfs_filblks_t len, struct xfs_bmbt_irec *mval, int *nmap, int flags); -int xfs_bmapi_delay(struct xfs_inode *ip, xfs_fileoff_t bno, +int xfs_bmapi_delay(struct xfs_inode *ip, int whichfork, xfs_fileoff_t bno, xfs_filblks_t len, struct xfs_bmbt_irec *mval, int *nmap, int flags); int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip, diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 96dcaeb..53e027c 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -565,12 +565,13 @@ check_writeio: return alloc_blocks; } -int -xfs_iomap_write_delay( +STATIC int +__xfs_iomap_write_delay( xfs_inode_t *ip, xfs_off_t offset, size_t count, - xfs_bmbt_irec_t *ret_imap) + xfs_bmbt_irec_t *ret_imap, + int whichfork) { xfs_mount_t *mp = ip->i_mount; xfs_fileoff_t offset_fsb; @@ -596,10 +597,14 @@ xfs_iomap_write_delay( extsz = xfs_get_extsz_hint(ip); offset_fsb = XFS_B_TO_FSBT(mp, offset); - error = xfs_iomap_eof_want_preallocate(mp, ip, offset, count, - imap, XFS_WRITE_IMAPS, &prealloc); - if (error) - return error; + if (whichfork == XFS_DATA_FORK) { + error = xfs_iomap_eof_want_preallocate(mp, ip, offset, count, + imap, XFS_WRITE_IMAPS, &prealloc); + if (error) + return error; + } else { + prealloc = 0; + } retry: if (prealloc) { @@ -631,8 +636,8 @@ retry: ASSERT(last_fsb > offset_fsb); nimaps = XFS_WRITE_IMAPS; - error = xfs_bmapi_delay(ip, offset_fsb, last_fsb - offset_fsb, - imap, &nimaps, XFS_BMAPI_ENTIRE); + error = xfs_bmapi_delay(ip, whichfork, offset_fsb, + last_fsb - offset_fsb, imap, &nimaps, XFS_BMAPI_ENTIRE); switch (error) { case 0: case -ENOSPC: @@ -670,6 +675,31 @@ retry: return 0; } +int +xfs_iomap_write_delay( + xfs_inode_t *ip, + xfs_off_t offset, + size_t count, + xfs_bmbt_irec_t *ret_imap) +{ + return __xfs_iomap_write_delay(ip, offset, count, ret_imap, + XFS_DATA_FORK); +} + +int +xfs_iomap_cow_delay( + xfs_inode_t *ip, + xfs_off_t offset, + size_t count, + xfs_bmbt_irec_t *ret_imap) +{ + ASSERT(XFS_IFORK_PTR(ip, XFS_COW_FORK) != NULL); + trace_xfs_iomap_cow_delay(ip, offset, count); + + return __xfs_iomap_write_delay(ip, offset, count, ret_imap, + XFS_COW_FORK); +} + /* * Pass in a delayed allocate extent, convert it to real extents; * return to the caller the extent we create which maps on top of diff --git a/fs/xfs/xfs_iomap.h b/fs/xfs/xfs_iomap.h index 8688e66..f6a9adf 100644 --- a/fs/xfs/xfs_iomap.h +++ b/fs/xfs/xfs_iomap.h @@ -28,5 +28,7 @@ int xfs_iomap_write_delay(struct xfs_inode *, xfs_off_t, size_t, int xfs_iomap_write_allocate(struct xfs_inode *, xfs_off_t, struct xfs_bmbt_irec *); int xfs_iomap_write_unwritten(struct xfs_inode *, xfs_off_t, xfs_off_t); +int xfs_iomap_cow_delay(struct xfs_inode *, xfs_off_t, size_t, + struct xfs_bmbt_irec *); #endif /* __XFS_IOMAP_H__*/ _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs