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f52792f484
When a layout conflict triggers a recall, enforcing a timeout is necessary to prevent excessive nfsd threads from being blocked in __break_lease ensuring the server continues servicing incoming requests efficiently. This patch introduces a new function to lease_manager_operations: lm_breaker_timedout: Invoked when a lease recall times out and is about to be disposed of. This function enables the lease manager to inform the caller whether the file_lease should remain on the flc_list or be disposed of. For the NFSD lease manager, this function now handles layout recall timeouts. If the layout type supports fencing and the client has not been fenced, a fence operation is triggered to prevent the client from accessing the block device. While the fencing operation is in progress, the conflicting file_lease remains on the flc_list until fencing is complete. This guarantees that no other clients can access the file, and the client with exclusive access is properly blocked before disposal. Signed-off-by: Dai Ngo <dai.ngo@oracle.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _FS_NFSD_PNFS_H
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#define _FS_NFSD_PNFS_H 1
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#ifdef CONFIG_NFSD_V4
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#include <linux/exportfs.h>
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#include <linux/nfsd/export.h>
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#include "state.h"
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#include "xdr4.h"
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struct xdr_stream;
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/* Cap exponential backoff between fence retries at 3 minutes */
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#define MAX_FENCE_DELAY ((unsigned int)(3 * 60 * HZ))
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struct nfsd4_deviceid_map {
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struct list_head hash;
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u64 idx;
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int fsid_type;
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u32 fsid[];
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};
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struct nfsd4_layout_ops {
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u32 notify_types;
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bool disable_recalls;
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__be32 (*proc_getdeviceinfo)(struct super_block *sb,
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struct svc_rqst *rqstp,
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struct nfs4_client *clp,
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struct nfsd4_getdeviceinfo *gdevp);
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__be32 (*encode_getdeviceinfo)(struct xdr_stream *xdr,
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const struct nfsd4_getdeviceinfo *gdevp);
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__be32 (*proc_layoutget)(struct svc_rqst *rqstp, struct inode *inode,
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const struct svc_fh *fhp, struct nfsd4_layoutget *lgp);
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__be32 (*encode_layoutget)(struct xdr_stream *xdr,
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const struct nfsd4_layoutget *lgp);
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__be32 (*proc_layoutcommit)(struct inode *inode,
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struct svc_rqst *rqstp,
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struct nfsd4_layoutcommit *lcp);
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bool (*fence_client)(struct nfs4_layout_stateid *ls,
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struct nfsd_file *file);
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};
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extern const struct nfsd4_layout_ops *nfsd4_layout_ops[];
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#ifdef CONFIG_NFSD_BLOCKLAYOUT
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extern const struct nfsd4_layout_ops bl_layout_ops;
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#endif
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#ifdef CONFIG_NFSD_SCSILAYOUT
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extern const struct nfsd4_layout_ops scsi_layout_ops;
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#endif
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#ifdef CONFIG_NFSD_FLEXFILELAYOUT
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extern const struct nfsd4_layout_ops ff_layout_ops;
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#endif
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__be32 nfsd4_preprocess_layout_stateid(struct svc_rqst *rqstp,
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struct nfsd4_compound_state *cstate, stateid_t *stateid,
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bool create, u32 layout_type, struct nfs4_layout_stateid **lsp);
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__be32 nfsd4_insert_layout(struct nfsd4_layoutget *lgp,
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struct nfs4_layout_stateid *ls);
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__be32 nfsd4_return_file_layouts(struct svc_rqst *rqstp,
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struct nfsd4_compound_state *cstate,
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struct nfsd4_layoutreturn *lrp);
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__be32 nfsd4_return_client_layouts(struct svc_rqst *rqstp,
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struct nfsd4_compound_state *cstate,
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struct nfsd4_layoutreturn *lrp);
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int nfsd4_set_deviceid(struct nfsd4_deviceid *id, const struct svc_fh *fhp,
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u32 device_generation);
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struct nfsd4_deviceid_map *nfsd4_find_devid_map(int idx);
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#endif /* CONFIG_NFSD_V4 */
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#ifdef CONFIG_NFSD_PNFS
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void nfsd4_setup_layout_type(struct svc_export *exp);
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void nfsd4_return_all_client_layouts(struct nfs4_client *);
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void nfsd4_return_all_file_layouts(struct nfs4_client *clp,
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struct nfs4_file *fp);
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void nfsd4_close_layout(struct nfs4_layout_stateid *ls);
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int nfsd4_init_pnfs(void);
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void nfsd4_exit_pnfs(void);
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#else
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struct nfs4_client;
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struct nfs4_file;
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struct nfs4_layout_stateid;
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static inline void nfsd4_setup_layout_type(struct svc_export *exp)
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{
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}
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static inline void nfsd4_return_all_client_layouts(struct nfs4_client *clp)
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{
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}
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static inline void nfsd4_return_all_file_layouts(struct nfs4_client *clp,
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struct nfs4_file *fp)
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{
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}
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static inline void nfsd4_close_layout(struct nfs4_layout_stateid *ls)
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{
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}
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static inline void nfsd4_exit_pnfs(void)
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{
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}
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static inline int nfsd4_init_pnfs(void)
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{
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return 0;
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}
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#endif /* CONFIG_NFSD_PNFS */
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#endif /* _FS_NFSD_PNFS_H */
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