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Now that CoW-based atomic writes are supported, update the max size of an atomic write for the data device. The limit of a CoW-based atomic write will be the limit of the number of logitems which can fit into a single transaction. In addition, the max atomic write size needs to be aligned to the agsize. Limit the size of atomic writes to the greatest power-of-two factor of the agsize so that allocations for an atomic write will always be aligned compatibly with the alignment requirements of the storage. Function xfs_atomic_write_logitems() is added to find the limit the number of log items which can fit in a single transaction. Amend the max atomic write computation to create a new transaction reservation type, and compute the maximum size of an atomic write completion (in fsblocks) based on this new transaction reservation. Initially, tr_atomic_write is a clone of tr_itruncate, which provides a reasonable level of parallelism. In the next patch, we'll add a mount option so that sysadmins can configure their own limits. [djwong: use a new reservation type for atomic write ioends, refactor group limit calculations] Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Darrick J. Wong <djwong@kernel.org> [jpg: rounddown power-of-2 always] Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: John Garry <john.g.garry@oracle.com>
73 lines
2.9 KiB
C
73 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2016 Oracle. All Rights Reserved.
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*/
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#ifndef __XFS_REFLINK_H
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#define __XFS_REFLINK_H 1
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/*
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* Check whether it is safe to free COW fork blocks from an inode. It is unsafe
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* to do so when an inode has dirty cache or I/O in-flight, even if no shared
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* extents exist in the data fork, because outstanding I/O may target blocks
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* that were speculatively allocated to the COW fork.
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*/
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static inline bool
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xfs_can_free_cowblocks(struct xfs_inode *ip)
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{
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struct inode *inode = VFS_I(ip);
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if ((inode->i_state & I_DIRTY_PAGES) ||
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mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
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mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK) ||
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atomic_read(&inode->i_dio_count))
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return false;
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return true;
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}
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int xfs_reflink_trim_around_shared(struct xfs_inode *ip,
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struct xfs_bmbt_irec *irec, bool *shared);
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int xfs_bmap_trim_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,
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bool *shared);
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int xfs_reflink_allocate_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,
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struct xfs_bmbt_irec *cmap, bool *shared, uint *lockmode,
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bool convert_now);
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extern int xfs_reflink_convert_cow(struct xfs_inode *ip, xfs_off_t offset,
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xfs_off_t count);
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int xfs_reflink_convert_cow_locked(struct xfs_inode *ip,
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xfs_fileoff_t offset_fsb, xfs_filblks_t count_fsb);
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extern int xfs_reflink_cancel_cow_blocks(struct xfs_inode *ip,
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struct xfs_trans **tpp, xfs_fileoff_t offset_fsb,
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xfs_fileoff_t end_fsb, bool cancel_real);
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extern int xfs_reflink_cancel_cow_range(struct xfs_inode *ip, xfs_off_t offset,
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xfs_off_t count, bool cancel_real);
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extern int xfs_reflink_end_cow(struct xfs_inode *ip, xfs_off_t offset,
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xfs_off_t count);
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int xfs_reflink_end_atomic_cow(struct xfs_inode *ip, xfs_off_t offset,
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xfs_off_t count);
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extern int xfs_reflink_recover_cow(struct xfs_mount *mp);
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extern loff_t xfs_reflink_remap_range(struct file *file_in, loff_t pos_in,
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struct file *file_out, loff_t pos_out, loff_t len,
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unsigned int remap_flags);
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extern int xfs_reflink_inode_has_shared_extents(struct xfs_trans *tp,
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struct xfs_inode *ip, bool *has_shared);
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extern int xfs_reflink_clear_inode_flag(struct xfs_inode *ip,
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struct xfs_trans **tpp);
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extern int xfs_reflink_unshare(struct xfs_inode *ip, xfs_off_t offset,
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xfs_off_t len);
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extern int xfs_reflink_remap_prep(struct file *file_in, loff_t pos_in,
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struct file *file_out, loff_t pos_out, loff_t *len,
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unsigned int remap_flags);
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extern int xfs_reflink_remap_blocks(struct xfs_inode *src, loff_t pos_in,
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struct xfs_inode *dest, loff_t pos_out, loff_t remap_len,
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loff_t *remapped);
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extern int xfs_reflink_update_dest(struct xfs_inode *dest, xfs_off_t newlen,
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xfs_extlen_t cowextsize, unsigned int remap_flags);
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bool xfs_reflink_supports_rextsize(struct xfs_mount *mp, unsigned int rextsize);
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xfs_extlen_t xfs_reflink_max_atomic_cow(struct xfs_mount *mp);
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#endif /* __XFS_REFLINK_H */
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