forked from luck/tmp_suning_uos_patched
ef4736678f
Modify the writepage handler to find and convert pending delalloc extents to real allocations. Furthermore, when we're doing non-cow writes to a part of a file that already has a CoW reservation (the cowextsz hint that we set up in a subsequent patch facilitates this), promote the write to copy-on-write so that the entire extent can get written out as a single extent on disk, thereby reducing post-CoW fragmentation. Christoph moved the CoW support code in _map_blocks to a separate helper function, refactored other functions, and reduced the number of CoW fork lookups, so I merged those changes here to reduce churn. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
73 lines
2.6 KiB
C
73 lines
2.6 KiB
C
/*
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* Copyright (c) 2005-2006 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_AOPS_H__
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#define __XFS_AOPS_H__
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extern struct bio_set *xfs_ioend_bioset;
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/*
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* Types of I/O for bmap clustering and I/O completion tracking.
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*/
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enum {
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XFS_IO_INVALID, /* initial state */
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XFS_IO_DELALLOC, /* covers delalloc region */
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XFS_IO_UNWRITTEN, /* covers allocated but uninitialized data */
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XFS_IO_OVERWRITE, /* covers already allocated extent */
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XFS_IO_COW, /* covers copy-on-write extent */
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};
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#define XFS_IO_TYPES \
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{ XFS_IO_INVALID, "invalid" }, \
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{ XFS_IO_DELALLOC, "delalloc" }, \
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{ XFS_IO_UNWRITTEN, "unwritten" }, \
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{ XFS_IO_OVERWRITE, "overwrite" }, \
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{ XFS_IO_COW, "CoW" }
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/*
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* Structure for buffered I/O completions.
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*/
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struct xfs_ioend {
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struct list_head io_list; /* next ioend in chain */
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unsigned int io_type; /* delalloc / unwritten */
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struct inode *io_inode; /* file being written to */
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size_t io_size; /* size of the extent */
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xfs_off_t io_offset; /* offset in the file */
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struct work_struct io_work; /* xfsdatad work queue */
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struct xfs_trans *io_append_trans;/* xact. for size update */
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struct bio *io_bio; /* bio being built */
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struct bio io_inline_bio; /* MUST BE LAST! */
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};
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extern const struct address_space_operations xfs_address_space_operations;
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int xfs_get_blocks(struct inode *inode, sector_t offset,
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struct buffer_head *map_bh, int create);
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int xfs_get_blocks_direct(struct inode *inode, sector_t offset,
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struct buffer_head *map_bh, int create);
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int xfs_get_blocks_dax_fault(struct inode *inode, sector_t offset,
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struct buffer_head *map_bh, int create);
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int xfs_end_io_direct_write(struct kiocb *iocb, loff_t offset,
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ssize_t size, void *private);
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int xfs_setfilesize(struct xfs_inode *ip, xfs_off_t offset, size_t size);
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extern void xfs_count_page_state(struct page *, int *, int *);
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extern struct block_device *xfs_find_bdev_for_inode(struct inode *);
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#endif /* __XFS_AOPS_H__ */
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