![Darrick J. Wong](/assets/img/avatar_default.png)
Create a per-inode extent size allocator hint for copy-on-write. This hint is separate from the existing extent size hint so that CoW can take advantage of the fragmentation-reducing properties of extent size hints without disabling delalloc for regular writes. The extent size hint that's fed to the allocator during a copy on write operation is the greater of the cowextsize and regular extsize hint. During reflink, if we're sharing the entire source file to the entire destination file and the destination file doesn't already have a cowextsize hint, propagate the source file's cowextsize hint to the destination file. Furthermore, zero the bulkstat buffer prior to setting the fields so that we don't copy kernel memory contents into userspace. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
40 lines
1.3 KiB
C
40 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 *, int, 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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xfs_extlen_t xfs_eof_alignment(struct xfs_inode *ip, xfs_extlen_t extsize);
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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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