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Currently xfs_iomap_write_delay does up to lookups in the inode extent tree, which is rather costly especially with the new iomap based write path and small write sizes. But it turns out that the low-level xfs_bmap_search_extents gives us all the information we need in the regular delalloc buffered write path: - it will return us an extent covering the block we are looking up if it exists. In that case we can simply return that extent to the caller and are done - it will tell us if we are beyoned the last current allocated block with an eof return parameter. In that case we can create a delalloc reservation and use the also returned information about the last extent in the file as the hint to size our delalloc reservation. - it can tell us that we are writing into a hole, but that there is an extent beyoned this hole. In this case we can create a delalloc reservation that covers the requested size (possible capped to the next existing allocation). All that can be done in one single routine instead of bouncing up and down a few layers. This reduced the CPU overhead of the block mapping routines and also simplified the code a lot. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
38 lines
1.3 KiB
C
38 lines
1.3 KiB
C
/*
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* Copyright (c) 2003-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_IOMAP_H__
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#define __XFS_IOMAP_H__
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#include <linux/iomap.h>
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struct xfs_inode;
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struct xfs_bmbt_irec;
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int xfs_iomap_write_direct(struct xfs_inode *, xfs_off_t, size_t,
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struct xfs_bmbt_irec *, int);
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int xfs_iomap_write_allocate(struct xfs_inode *, xfs_off_t,
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struct xfs_bmbt_irec *);
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int xfs_iomap_write_unwritten(struct xfs_inode *, xfs_off_t, xfs_off_t);
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void xfs_bmbt_to_iomap(struct xfs_inode *, struct iomap *,
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struct xfs_bmbt_irec *);
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extern struct iomap_ops xfs_iomap_ops;
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extern struct iomap_ops xfs_xattr_iomap_ops;
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#endif /* __XFS_IOMAP_H__*/
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