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fs/nfs/pnfs.h
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/* * pNFS client data structures. * * Copyright (c) 2002 * The Regents of the University of Michigan * All Rights Reserved * * Dean Hildebrand <dhildebz@umich.edu> * * Permission is granted to use, copy, create derivative works, and * redistribute this software and such derivative works for any purpose, * so long as the name of the University of Michigan is not used in * any advertising or publicity pertaining to the use or distribution * of this software without specific, written prior authorization. If * the above copyright notice or any other identification of the * University of Michigan is included in any copy of any portion of * this software, then the disclaimer below must also be included. * * This software is provided as is, without representation or warranty * of any kind either express or implied, including without limitation * the implied warranties of merchantability, fitness for a particular * purpose, or noninfringement. The Regents of the University of * Michigan shall not be liable for any damages, including special, * indirect, incidental, or consequential damages, with respect to any * claim arising out of or in connection with the use of the software, * even if it has been or is hereafter advised of the possibility of * such damages. */ #ifndef FS_NFS_PNFS_H #define FS_NFS_PNFS_H |
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#include <linux/nfs_fs.h> |
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#include <linux/nfs_page.h> |
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enum { NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */ |
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NFS_LSEG_ROC, /* roc bit received from server */ |
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NFS_LSEG_LAYOUTCOMMIT, /* layoutcommit bit set for layoutcommit */ |
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}; |
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struct pnfs_layout_segment { |
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struct list_head pls_list; |
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struct list_head pls_lc_list; |
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struct pnfs_layout_range pls_range; |
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atomic_t pls_refcount; unsigned long pls_flags; |
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struct pnfs_layout_hdr *pls_layout; |
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}; |
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enum pnfs_try_status { PNFS_ATTEMPTED = 0, PNFS_NOT_ATTEMPTED = 1, }; |
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#ifdef CONFIG_NFS_V4_1 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4" |
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enum { NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */ NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */ |
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NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */ |
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NFS_LAYOUT_ROC, /* some lseg had roc bit set */ |
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NFS_LAYOUT_DESTROYED, /* no new use of layout allowed */ |
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}; |
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enum layoutdriver_policy_flags { /* Should the pNFS client commit and return the layout upon a setattr */ PNFS_LAYOUTRET_ON_SETATTR = 1 << 0, |
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PNFS_LAYOUTRET_ON_ERROR = 1 << 1, |
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}; |
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struct nfs4_deviceid_node; |
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/* Per-layout driver specific registration structure */ struct pnfs_layoutdriver_type { |
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struct list_head pnfs_tblid; const u32 id; const char *name; struct module *owner; |
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unsigned flags; |
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int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *); int (*clear_layoutdriver) (struct nfs_server *); |
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struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags); void (*free_layout_hdr) (struct pnfs_layout_hdr *); |
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struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags); |
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void (*free_lseg) (struct pnfs_layout_segment *lseg); |
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/* test for nfs page cache coalescing */ |
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const struct nfs_pageio_ops *pg_read_ops; const struct nfs_pageio_ops *pg_write_ops; |
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/* Returns true if layoutdriver wants to divert this request to * driver's commit routine. */ bool (*mark_pnfs_commit)(struct pnfs_layout_segment *lseg); struct list_head * (*choose_commit_list) (struct nfs_page *req); int (*commit_pagelist)(struct inode *inode, struct list_head *mds_pages, int how); |
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/* * Return PNFS_ATTEMPTED to indicate the layout code has attempted * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS */ enum pnfs_try_status (*read_pagelist) (struct nfs_read_data *nfs_data); |
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enum pnfs_try_status (*write_pagelist) (struct nfs_write_data *nfs_data, int how); |
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void (*free_deviceid_node) (struct nfs4_deviceid_node *); |
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void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid, struct xdr_stream *xdr, const struct nfs4_layoutreturn_args *args); |
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void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data); |
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void (*encode_layoutcommit) (struct pnfs_layout_hdr *layoutid, struct xdr_stream *xdr, const struct nfs4_layoutcommit_args *args); |
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}; |
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struct pnfs_layout_hdr { |
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atomic_t plh_refcount; |
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struct list_head plh_layouts; /* other client layouts */ |
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struct list_head plh_bulk_recall; /* clnt list of bulk recalls */ |
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struct list_head plh_segs; /* layout segments list */ |
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nfs4_stateid plh_stateid; |
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atomic_t plh_outstanding; /* number of RPCs out */ |
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unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */ |
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u32 plh_barrier; /* ignore lower seqids */ |
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unsigned long plh_flags; |
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loff_t plh_lwb; /* last write byte for layoutcommit */ |
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struct rpc_cred *plh_lc_cred; /* layoutcommit cred */ |
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struct inode *plh_inode; |
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}; |
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struct pnfs_device { struct nfs4_deviceid dev_id; unsigned int layout_type; unsigned int mincount; struct page **pages; |
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unsigned int pgbase; unsigned int pglen; }; |
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#define NFS4_PNFS_GETDEVLIST_MAXNUM 16 struct pnfs_devicelist { unsigned int eof; unsigned int num_devs; struct nfs4_deviceid dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM]; }; |
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extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *); extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *); |
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/* nfs4proc.c */ |
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extern int nfs4_proc_getdevicelist(struct nfs_server *server, const struct nfs_fh *fh, struct pnfs_devicelist *devlist); |
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extern int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *dev); extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp); |
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extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp); |
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/* pnfs.c */ |
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void get_layout_hdr(struct pnfs_layout_hdr *lo); |
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void put_lseg(struct pnfs_layout_segment *lseg); |
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bool pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *); bool pnfs_pageio_init_write(struct nfs_pageio_descriptor *, struct inode *, int); |
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void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32); |
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void unset_pnfs_layoutdriver(struct nfs_server *); |
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void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *); |
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int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc); |
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void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *, struct nfs_page *); |
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int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc); |
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bool pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, struct nfs_page *req); |
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void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg); |
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int pnfs_layout_process(struct nfs4_layoutget *lgp); |
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void pnfs_free_lseg_list(struct list_head *tmp_list); |
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void pnfs_destroy_layout(struct nfs_inode *); |
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void pnfs_destroy_all_layouts(struct nfs_client *); |
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void put_layout_hdr(struct pnfs_layout_hdr *lo); |
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void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new, bool update_barrier); |
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int pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo, struct nfs4_state *open_state); |
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int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, struct list_head *tmp_list, |
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struct pnfs_layout_range *recall_range); |
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bool pnfs_roc(struct inode *ino); void pnfs_roc_release(struct inode *ino); void pnfs_roc_set_barrier(struct inode *ino, u32 barrier); bool pnfs_roc_drain(struct inode *ino, u32 *barrier); |
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void pnfs_set_layoutcommit(struct nfs_write_data *wdata); |
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void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data); |
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int pnfs_layoutcommit_inode(struct inode *inode, bool sync); |
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int _pnfs_return_layout(struct inode *); |
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void pnfs_ld_write_done(struct nfs_write_data *); |
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void pnfs_ld_read_done(struct nfs_read_data *); |
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struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx, loff_t pos, u64 count, enum pnfs_iomode iomode, gfp_t gfp_flags); |
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void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp); /* nfs4_deviceid_flags */ enum { NFS_DEVICEID_INVALID = 0, /* set when MDS clientid recalled */ }; |
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/* pnfs_dev.c */ struct nfs4_deviceid_node { struct hlist_node node; |
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struct hlist_node tmpnode; |
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const struct pnfs_layoutdriver_type *ld; |
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const struct nfs_client *nfs_client; |
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unsigned long flags; |
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struct nfs4_deviceid deviceid; atomic_t ref; }; void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id); |
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struct nfs4_deviceid_node *nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *); |
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void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *); |
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void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, |
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const struct pnfs_layoutdriver_type *, |
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const struct nfs_client *, const struct nfs4_deviceid *); struct nfs4_deviceid_node *nfs4_insert_deviceid_node(struct nfs4_deviceid_node *); bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *); |
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void nfs4_deviceid_purge_client(const struct nfs_client *); |
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static inline int lo_fail_bit(u32 iomode) { return iomode == IOMODE_RW ? NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED; } |
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static inline struct pnfs_layout_segment * get_lseg(struct pnfs_layout_segment *lseg) { if (lseg) { atomic_inc(&lseg->pls_refcount); smp_mb__after_atomic_inc(); } return lseg; } |
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/* Return true if a layout driver is being used for this mountpoint */ static inline int pnfs_enabled_sb(struct nfs_server *nfss) { return nfss->pnfs_curr_ld != NULL; } |
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static inline void pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg) { if (lseg) { struct pnfs_layoutdriver_type *ld; ld = NFS_SERVER(req->wb_page->mapping->host)->pnfs_curr_ld; if (ld->mark_pnfs_commit && ld->mark_pnfs_commit(lseg)) { set_bit(PG_PNFS_COMMIT, &req->wb_flags); req->wb_commit_lseg = get_lseg(lseg); } } } static inline int pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how) { if (!test_and_clear_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags)) return PNFS_NOT_ATTEMPTED; return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how); } static inline struct list_head * pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds) { struct list_head *rv; if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags)) { struct inode *inode = req->wb_commit_lseg->pls_layout->plh_inode; set_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags); rv = NFS_SERVER(inode)->pnfs_curr_ld->choose_commit_list(req); /* matched by ref taken when PG_PNFS_COMMIT is set */ put_lseg(req->wb_commit_lseg); } else rv = mds; return rv; } static inline void pnfs_clear_request_commit(struct nfs_page *req) { if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags)) put_lseg(req->wb_commit_lseg); } |
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/* Should the pNFS client commit and return the layout upon a setattr */ static inline bool pnfs_ld_layoutret_on_setattr(struct inode *inode) { if (!pnfs_enabled_sb(NFS_SERVER(inode))) return false; return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_LAYOUTRET_ON_SETATTR; } |
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static inline int pnfs_return_layout(struct inode *ino) { struct nfs_inode *nfsi = NFS_I(ino); struct nfs_server *nfss = NFS_SERVER(ino); if (pnfs_enabled_sb(nfss) && nfsi->layout) return _pnfs_return_layout(ino); return 0; } |
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#else /* CONFIG_NFS_V4_1 */ |
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static inline void pnfs_destroy_all_layouts(struct nfs_client *clp) { } |
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static inline void pnfs_destroy_layout(struct nfs_inode *nfsi) { } static inline struct pnfs_layout_segment * |
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get_lseg(struct pnfs_layout_segment *lseg) { return NULL; } static inline void put_lseg(struct pnfs_layout_segment *lseg) { } |
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static inline int pnfs_return_layout(struct inode *ino) { return 0; } |
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static inline bool |
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pnfs_ld_layoutret_on_setattr(struct inode *inode) { return false; } static inline bool |
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pnfs_roc(struct inode *ino) { return false; } static inline void pnfs_roc_release(struct inode *ino) { } static inline void pnfs_roc_set_barrier(struct inode *ino, u32 barrier) { } static inline bool pnfs_roc_drain(struct inode *ino, u32 *barrier) { return false; } |
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static inline void set_pnfs_layoutdriver(struct nfs_server *s, |
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const struct nfs_fh *mntfh, u32 id) |
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{ } static inline void unset_pnfs_layoutdriver(struct nfs_server *s) { } |
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static inline bool pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode) |
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{ |
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return false; } static inline bool pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags) { return false; |
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} |
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static inline void pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg) { } static inline int pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how) { return PNFS_NOT_ATTEMPTED; } static inline struct list_head * pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds) { return mds; } static inline void pnfs_clear_request_commit(struct nfs_page *req) { } |
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static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync) |
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{ return 0; } |
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static inline void nfs4_deviceid_purge_client(struct nfs_client *ncl) { } |
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#endif /* CONFIG_NFS_V4_1 */ #endif /* FS_NFS_PNFS_H */ |