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f4e44b3933
Currently the source's export is mounted and unmounted on every inter-server copy operation. This patch is an enhancement to delay the unmount of the source export for a certain period of time to eliminate the mount and unmount overhead on subsequent copy operations. After a copy operation completes, a work entry is added to the delayed unmount list with an expiration time. This list is serviced by the laundromat thread to unmount the export of the expired entries. Each time the export is being used again, its expiration time is extended and the entry is re-inserted to the tail of the list. The unmount task and the mount operation of the copy request are synced to make sure the export is not unmounted while it's being used. Signed-off-by: Dai Ngo <dai.ngo@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
81 lines
2 KiB
C
81 lines
2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* include/linux/nfs_ssc.h
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*
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* Author: Dai Ngo <dai.ngo@oracle.com>
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*
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* Copyright (c) 2020, Oracle and/or its affiliates.
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*/
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#include <linux/nfs_fs.h>
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#include <linux/sunrpc/svc.h>
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extern struct nfs_ssc_client_ops_tbl nfs_ssc_client_tbl;
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/*
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* NFS_V4
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*/
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struct nfs4_ssc_client_ops {
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struct file *(*sco_open)(struct vfsmount *ss_mnt,
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struct nfs_fh *src_fh, nfs4_stateid *stateid);
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void (*sco_close)(struct file *filep);
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};
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/*
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* NFS_FS
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*/
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struct nfs_ssc_client_ops {
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void (*sco_sb_deactive)(struct super_block *sb);
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};
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struct nfs_ssc_client_ops_tbl {
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const struct nfs4_ssc_client_ops *ssc_nfs4_ops;
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const struct nfs_ssc_client_ops *ssc_nfs_ops;
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};
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extern void nfs42_ssc_register_ops(void);
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extern void nfs42_ssc_unregister_ops(void);
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extern void nfs42_ssc_register(const struct nfs4_ssc_client_ops *ops);
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extern void nfs42_ssc_unregister(const struct nfs4_ssc_client_ops *ops);
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#ifdef CONFIG_NFSD_V4_2_INTER_SSC
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static inline struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
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struct nfs_fh *src_fh, nfs4_stateid *stateid)
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{
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if (nfs_ssc_client_tbl.ssc_nfs4_ops)
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return (*nfs_ssc_client_tbl.ssc_nfs4_ops->sco_open)(ss_mnt, src_fh, stateid);
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return ERR_PTR(-EIO);
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}
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static inline void nfs42_ssc_close(struct file *filep)
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{
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if (nfs_ssc_client_tbl.ssc_nfs4_ops)
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(*nfs_ssc_client_tbl.ssc_nfs4_ops->sco_close)(filep);
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}
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struct nfsd4_ssc_umount_item {
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struct list_head nsui_list;
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bool nsui_busy;
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/*
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* nsui_refcnt inited to 2, 1 on list and 1 for consumer. Entry
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* is removed when refcnt drops to 1 and nsui_expire expires.
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*/
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refcount_t nsui_refcnt;
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unsigned long nsui_expire;
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struct vfsmount *nsui_vfsmount;
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char nsui_ipaddr[RPC_MAX_ADDRBUFLEN];
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};
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#endif
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/*
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* NFS_FS
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*/
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extern void nfs_ssc_register(const struct nfs_ssc_client_ops *ops);
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extern void nfs_ssc_unregister(const struct nfs_ssc_client_ops *ops);
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static inline void nfs_do_sb_deactive(struct super_block *sb)
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{
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if (nfs_ssc_client_tbl.ssc_nfs_ops)
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(*nfs_ssc_client_tbl.ssc_nfs_ops->sco_sb_deactive)(sb);
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}
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