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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>
60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2009, Christoph Hellwig
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* All Rights Reserved.
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_bit.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_group.h"
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#include "xfs_defer.h"
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#include "xfs_da_format.h"
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#include "xfs_inode.h"
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#include "xfs_btree.h"
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#include "xfs_da_btree.h"
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#include "xfs_alloc.h"
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#include "xfs_bmap.h"
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#include "xfs_attr.h"
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#include "xfs_trans.h"
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#include "xfs_log.h"
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#include "xfs_log_priv.h"
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#include "xfs_trans_priv.h"
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#include "xfs_buf_item.h"
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#include "xfs_quota.h"
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#include "xfs_dquot_item.h"
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#include "xfs_dquot.h"
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#include "xfs_log_recover.h"
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#include "xfs_filestream.h"
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#include "xfs_fsmap.h"
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#include "xfs_btree_staging.h"
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#include "xfs_icache.h"
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#include "xfs_iunlink_item.h"
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#include "xfs_ag.h"
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#include "xfs_ag_resv.h"
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#include "xfs_error.h"
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#include <linux/iomap.h>
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#include "xfs_iomap.h"
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#include "xfs_buf_mem.h"
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#include "xfs_btree_mem.h"
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#include "xfs_exchmaps.h"
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#include "xfs_exchrange.h"
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#include "xfs_parent.h"
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#include "xfs_rmap.h"
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#include "xfs_refcount.h"
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#include "xfs_metafile.h"
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#include "xfs_metadir.h"
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#include "xfs_rtgroup.h"
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#include "xfs_zone_alloc.h"
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#include "xfs_zone_priv.h"
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/*
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* We include this last to have the helpers above available for the trace
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* event implementations.
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*/
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#define CREATE_TRACE_POINTS
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#include "xfs_trace.h"
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