424 lines
12 KiB
C
424 lines
12 KiB
C
/*
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* pNFS client data structures.
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*
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* Copyright (c) 2002
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* The Regents of the University of Michigan
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* All Rights Reserved
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*
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* Dean Hildebrand <dhildebz@umich.edu>
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*
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* Permission is granted to use, copy, create derivative works, and
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* redistribute this software and such derivative works for any purpose,
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* so long as the name of the University of Michigan is not used in
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* any advertising or publicity pertaining to the use or distribution
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* of this software without specific, written prior authorization. If
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* the above copyright notice or any other identification of the
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* University of Michigan is included in any copy of any portion of
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* this software, then the disclaimer below must also be included.
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*
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* This software is provided as is, without representation or warranty
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* of any kind either express or implied, including without limitation
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* the implied warranties of merchantability, fitness for a particular
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* purpose, or noninfringement. The Regents of the University of
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* Michigan shall not be liable for any damages, including special,
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* indirect, incidental, or consequential damages, with respect to any
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* claim arising out of or in connection with the use of the software,
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* even if it has been or is hereafter advised of the possibility of
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* such damages.
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*/
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#ifndef FS_NFS_PNFS_H
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#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 {
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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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};
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struct pnfs_layout_segment {
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struct list_head pls_list;
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struct pnfs_layout_range pls_range;
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atomic_t pls_refcount;
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unsigned long pls_flags;
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struct pnfs_layout_hdr *pls_layout;
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struct rpc_cred *pls_lc_cred; /* LAYOUTCOMMIT credential */
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loff_t pls_end_pos; /* LAYOUTCOMMIT write end */
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};
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enum pnfs_try_status {
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PNFS_ATTEMPTED = 0,
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PNFS_NOT_ATTEMPTED = 1,
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};
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#ifdef CONFIG_NFS_V4_1
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#define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
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enum {
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NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
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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 {
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/* Should the pNFS client commit and return the layout upon a setattr */
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PNFS_LAYOUTRET_ON_SETATTR = 1 << 0,
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};
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struct nfs4_deviceid_node;
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/* Per-layout driver specific registration structure */
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struct pnfs_layoutdriver_type {
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struct list_head pnfs_tblid;
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const u32 id;
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const char *name;
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struct module *owner;
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unsigned flags;
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struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
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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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bool (*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *, struct nfs_page *);
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/* Returns true if layoutdriver wants to divert this request to
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* driver's commit routine.
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*/
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bool (*mark_pnfs_commit)(struct pnfs_layout_segment *lseg);
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struct list_head * (*choose_commit_list) (struct nfs_page *req);
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int (*commit_pagelist)(struct inode *inode, struct list_head *mds_pages, int how);
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/*
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* Return PNFS_ATTEMPTED to indicate the layout code has attempted
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* I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
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*/
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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,
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struct xdr_stream *xdr,
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const struct nfs4_layoutreturn_args *args);
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void (*encode_layoutcommit) (struct pnfs_layout_hdr *layoutid,
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struct xdr_stream *xdr,
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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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struct inode *plh_inode;
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};
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struct pnfs_device {
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struct nfs4_deviceid dev_id;
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unsigned int layout_type;
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unsigned int mincount;
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struct page **pages;
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unsigned int pgbase;
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unsigned int pglen;
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};
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extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
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extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
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/* nfs4proc.c */
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extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
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struct pnfs_device *dev);
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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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struct pnfs_layout_segment *
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pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
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loff_t pos, u64 count, enum pnfs_iomode access_type,
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gfp_t gfp_flags);
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void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
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void unset_pnfs_layoutdriver(struct nfs_server *);
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enum pnfs_try_status pnfs_try_to_write_data(struct nfs_write_data *,
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const struct rpc_call_ops *, int);
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enum pnfs_try_status pnfs_try_to_read_data(struct nfs_read_data *,
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const struct rpc_call_ops *);
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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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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,
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const nfs4_stateid *new,
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bool update_barrier);
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int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
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struct pnfs_layout_hdr *lo,
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struct nfs4_state *open_state);
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int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
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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);
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void pnfs_roc_release(struct inode *ino);
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void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
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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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int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
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int _pnfs_return_layout(struct inode *);
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int pnfs_ld_write_done(struct nfs_write_data *);
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int pnfs_ld_read_done(struct nfs_read_data *);
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/* pnfs_dev.c */
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struct nfs4_deviceid_node {
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struct hlist_node node;
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const struct pnfs_layoutdriver_type *ld;
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const struct nfs_client *nfs_client;
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struct nfs4_deviceid deviceid;
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atomic_t ref;
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};
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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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struct nfs4_deviceid_node *nfs4_unhash_put_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 *,
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const struct nfs4_deviceid *);
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struct nfs4_deviceid_node *nfs4_insert_deviceid_node(struct nfs4_deviceid_node *);
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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)
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{
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return iomode == IOMODE_RW ?
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NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
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}
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static inline struct pnfs_layout_segment *
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get_lseg(struct pnfs_layout_segment *lseg)
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{
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if (lseg) {
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atomic_inc(&lseg->pls_refcount);
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smp_mb__after_atomic_inc();
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}
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return lseg;
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}
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/* Return true if a layout driver is being used for this mountpoint */
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static inline int pnfs_enabled_sb(struct nfs_server *nfss)
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{
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return nfss->pnfs_curr_ld != NULL;
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}
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static inline void
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pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
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{
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if (lseg) {
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struct pnfs_layoutdriver_type *ld;
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ld = NFS_SERVER(req->wb_page->mapping->host)->pnfs_curr_ld;
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if (ld->mark_pnfs_commit && ld->mark_pnfs_commit(lseg)) {
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set_bit(PG_PNFS_COMMIT, &req->wb_flags);
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req->wb_commit_lseg = get_lseg(lseg);
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}
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}
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}
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static inline int
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pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how)
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{
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if (!test_and_clear_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags))
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return PNFS_NOT_ATTEMPTED;
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return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how);
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}
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static inline struct list_head *
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pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds)
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{
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struct list_head *rv;
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if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags)) {
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struct inode *inode = req->wb_commit_lseg->pls_layout->plh_inode;
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set_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags);
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rv = NFS_SERVER(inode)->pnfs_curr_ld->choose_commit_list(req);
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/* matched by ref taken when PG_PNFS_COMMIT is set */
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put_lseg(req->wb_commit_lseg);
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} else
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rv = mds;
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return rv;
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}
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static inline void pnfs_clear_request_commit(struct nfs_page *req)
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{
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if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags))
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put_lseg(req->wb_commit_lseg);
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}
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/* Should the pNFS client commit and return the layout upon a setattr */
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static inline bool
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pnfs_ld_layoutret_on_setattr(struct inode *inode)
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{
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if (!pnfs_enabled_sb(NFS_SERVER(inode)))
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return false;
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return NFS_SERVER(inode)->pnfs_curr_ld->flags &
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PNFS_LAYOUTRET_ON_SETATTR;
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}
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static inline int pnfs_return_layout(struct inode *ino)
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{
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struct nfs_inode *nfsi = NFS_I(ino);
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struct nfs_server *nfss = NFS_SERVER(ino);
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if (pnfs_enabled_sb(nfss) && nfsi->layout)
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return _pnfs_return_layout(ino);
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return 0;
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}
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static inline void pnfs_pageio_init(struct nfs_pageio_descriptor *pgio,
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struct inode *inode)
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{
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struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
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if (ld)
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pgio->pg_test = ld->pg_test;
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}
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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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{
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}
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static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
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{
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}
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static inline struct pnfs_layout_segment *
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get_lseg(struct pnfs_layout_segment *lseg)
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{
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return NULL;
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}
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static inline void put_lseg(struct pnfs_layout_segment *lseg)
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{
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}
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static inline struct pnfs_layout_segment *
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pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
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loff_t pos, u64 count, enum pnfs_iomode access_type,
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gfp_t gfp_flags)
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{
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return NULL;
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}
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static inline enum pnfs_try_status
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pnfs_try_to_read_data(struct nfs_read_data *data,
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const struct rpc_call_ops *call_ops)
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{
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return PNFS_NOT_ATTEMPTED;
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}
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static inline enum pnfs_try_status
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pnfs_try_to_write_data(struct nfs_write_data *data,
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const struct rpc_call_ops *call_ops, int how)
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{
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return PNFS_NOT_ATTEMPTED;
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}
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static inline int pnfs_return_layout(struct inode *ino)
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{
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return 0;
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}
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static inline bool
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pnfs_ld_layoutret_on_setattr(struct inode *inode)
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{
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return false;
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}
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static inline bool
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pnfs_roc(struct inode *ino)
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{
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return false;
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}
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static inline void
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pnfs_roc_release(struct inode *ino)
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{
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}
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static inline void
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pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
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{
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}
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static inline bool
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pnfs_roc_drain(struct inode *ino, u32 *barrier)
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{
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return false;
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}
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static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
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{
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}
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static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
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{
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}
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static inline void pnfs_pageio_init(struct nfs_pageio_descriptor *pgio,
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struct inode *inode)
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{
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}
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static inline void
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pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
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{
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}
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static inline int
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pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how)
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{
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return PNFS_NOT_ATTEMPTED;
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}
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static inline struct list_head *
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pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds)
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{
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return mds;
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}
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static inline void pnfs_clear_request_commit(struct nfs_page *req)
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{
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}
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static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
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{
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return 0;
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}
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static inline void nfs4_deviceid_purge_client(struct nfs_client *ncl)
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{
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}
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#endif /* CONFIG_NFS_V4_1 */
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#endif /* FS_NFS_PNFS_H */
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