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Currently each metabtree inode has it's own space reservation to ensure it can be expanded to the maximum size, mirroring what is done for the AG-based btrees. But unlike the AG-based btrees the metabtree inodes aren't restricted to allocate from a single AG but can use free space form the entire file system. And unlike AG-based btrees where the required reservation shrinks with the available free space due to this, the metabtree reservations for the rtrmap and rtfreflink trees are not bound in any way by the data device free space as they track RT extent allocations. This is not very efficient as it requires a large number of blocks to be set aside that can't be used at all by other btrees. Switch to a model that uses a global pool instead in preparation for reducing the amount of reserved space, which now also removes the overloading of the i_nblocks field for metabtree inodes, which would create problems if metabtree inodes ever had a big enough xattr fork to require xattr blocks outside the inode. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
44 lines
1.6 KiB
C
44 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (c) 2018-2024 Oracle. All Rights Reserved.
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* Author: Darrick J. Wong <djwong@kernel.org>
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*/
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#ifndef __XFS_METAFILE_H__
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#define __XFS_METAFILE_H__
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const char *xfs_metafile_type_str(enum xfs_metafile_type metatype);
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/* All metadata files must have these flags set. */
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#define XFS_METAFILE_DIFLAGS (XFS_DIFLAG_IMMUTABLE | \
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XFS_DIFLAG_SYNC | \
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XFS_DIFLAG_NOATIME | \
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XFS_DIFLAG_NODUMP | \
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XFS_DIFLAG_NODEFRAG)
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/* All metadata directories must have these flags set. */
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#define XFS_METADIR_DIFLAGS (XFS_METAFILE_DIFLAGS | \
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XFS_DIFLAG_NOSYMLINKS)
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void xfs_metafile_set_iflag(struct xfs_trans *tp, struct xfs_inode *ip,
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enum xfs_metafile_type metafile_type);
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void xfs_metafile_clear_iflag(struct xfs_trans *tp, struct xfs_inode *ip);
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/* Space reservations for metadata inodes. */
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struct xfs_alloc_arg;
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bool xfs_metafile_resv_critical(struct xfs_mount *mp);
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void xfs_metafile_resv_alloc_space(struct xfs_inode *ip,
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struct xfs_alloc_arg *args);
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void xfs_metafile_resv_free_space(struct xfs_inode *ip, struct xfs_trans *tp,
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xfs_filblks_t len);
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void xfs_metafile_resv_free(struct xfs_mount *mp);
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int xfs_metafile_resv_init(struct xfs_mount *mp);
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/* Code specific to kernel/userspace; must be provided externally. */
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int xfs_trans_metafile_iget(struct xfs_trans *tp, xfs_ino_t ino,
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enum xfs_metafile_type metafile_type, struct xfs_inode **ipp);
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int xfs_metafile_iget(struct xfs_mount *mp, xfs_ino_t ino,
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enum xfs_metafile_type metafile_type, struct xfs_inode **ipp);
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#endif /* __XFS_METAFILE_H__ */
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