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For zoned RT devices space is always allocated at the write pointer, that is right after the last written block and only recorded on I/O completion. Because the actual allocation algorithm is very simple and just involves picking a good zone - preferably the one used for the last write to the inode. As the number of zones that can written at the same time is usually limited by the hardware, selecting a zone is done as late as possible from the iomap dio and buffered writeback bio submissions helpers just before submitting the bio. Given that the writers already took a reservation before acquiring the iolock, space will always be readily available if an open zone slot is available. A new structure is used to track these open zones, and pointed to by the xfs_rtgroup. Because zoned file systems don't have a rsum cache the space for that pointer can be reused. Allocations are only recorded at I/O completion time. The scheme used for that is very similar to the reflink COW end I/O path. Co-developed-by: Hans Holmberg <hans.holmberg@wdc.com> Signed-off-by: Hans Holmberg <hans.holmberg@wdc.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
35 lines
1.0 KiB
C
35 lines
1.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _XFS_ZONE_ALLOC_H
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#define _XFS_ZONE_ALLOC_H
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struct iomap_ioend;
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struct xfs_open_zone;
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void xfs_zone_alloc_and_submit(struct iomap_ioend *ioend,
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struct xfs_open_zone **oz);
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int xfs_zone_free_blocks(struct xfs_trans *tp, struct xfs_rtgroup *rtg,
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xfs_fsblock_t fsbno, xfs_filblks_t len);
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int xfs_zoned_end_io(struct xfs_inode *ip, xfs_off_t offset, xfs_off_t count,
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xfs_daddr_t daddr, struct xfs_open_zone *oz,
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xfs_fsblock_t old_startblock);
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void xfs_open_zone_put(struct xfs_open_zone *oz);
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void xfs_zoned_wake_all(struct xfs_mount *mp);
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bool xfs_zone_rgbno_is_valid(struct xfs_rtgroup *rtg, xfs_rgnumber_t rgbno);
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void xfs_mark_rtg_boundary(struct iomap_ioend *ioend);
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#ifdef CONFIG_XFS_RT
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int xfs_mount_zones(struct xfs_mount *mp);
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void xfs_unmount_zones(struct xfs_mount *mp);
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#else
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static inline int xfs_mount_zones(struct xfs_mount *mp)
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{
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return -EIO;
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}
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static inline void xfs_unmount_zones(struct xfs_mount *mp)
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{
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}
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#endif /* CONFIG_XFS_RT */
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#endif /* _XFS_ZONE_ALLOC_H */
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