From 3345746ef38bb794ae9d4d0762adf151e452663e Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 11 Jul 2018 22:26:02 -0700 Subject: [PATCH] xfs: simplify xfs_map_blocks by using xfs_iext_lookup_extent directly xfs_bmapi_read adds zero value in xfs_map_blocks. Replace it with a direct call to the low-level extent lookup function. Note that we now always pass a 0 length to the trace points as we ask for an unspecified len. Signed-off-by: Christoph Hellwig Reviewed-by: Brian Foster Reviewed-by: Darrick J. Wong Signed-off-by: Darrick J. Wong --- fs/xfs/xfs_aops.c | 19 +++++-------------- 1 file changed, 5 insertions(+), 14 deletions(-) diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index 5c5d8c8..0bfcc2d 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -375,7 +375,6 @@ xfs_map_blocks( int whichfork = XFS_DATA_FORK; struct xfs_iext_cursor icur; int error = 0; - int nimaps = 1; if (XFS_FORCED_SHUTDOWN(mp)) return -EIO; @@ -431,24 +430,16 @@ xfs_map_blocks( * offset. This will convert delayed allocations (including COW ones) * into real extents. */ - error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, - &imap, &nimaps, XFS_BMAPI_ENTIRE); + if (!xfs_iext_lookup_extent(ip, &ip->i_df, offset_fsb, &icur, &imap)) + imap.br_startoff = end_fsb; /* fake a hole past EOF */ xfs_iunlock(ip, XFS_ILOCK_SHARED); - if (error) - return error; - if (!nimaps) { - /* - * Lookup returns no match? Beyond eof? regardless, - * return it as a hole so we don't write it - */ + if (imap.br_startoff > offset_fsb) { + /* landed in a hole or beyond EOF */ + imap.br_blockcount = imap.br_startoff - offset_fsb; imap.br_startoff = offset_fsb; - imap.br_blockcount = end_fsb - offset_fsb; imap.br_startblock = HOLESTARTBLOCK; wpc->io_type = XFS_IO_HOLE; - } else if (imap.br_startblock == HOLESTARTBLOCK) { - /* landed in a hole */ - wpc->io_type = XFS_IO_HOLE; } else { if (isnullstartblock(imap.br_startblock)) { /* got a delalloc extent */ -- 2.7.4