331 lines
9.4 KiB
C
331 lines
9.4 KiB
C
/*
|
|
* 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
|
|
|
|
#include <linux/nfs_page.h>
|
|
|
|
enum {
|
|
NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */
|
|
NFS_LSEG_ROC, /* roc bit received from server */
|
|
};
|
|
|
|
struct pnfs_layout_segment {
|
|
struct list_head pls_list;
|
|
struct pnfs_layout_range pls_range;
|
|
atomic_t pls_refcount;
|
|
unsigned long pls_flags;
|
|
struct pnfs_layout_hdr *pls_layout;
|
|
};
|
|
|
|
enum pnfs_try_status {
|
|
PNFS_ATTEMPTED = 0,
|
|
PNFS_NOT_ATTEMPTED = 1,
|
|
};
|
|
|
|
#ifdef CONFIG_NFS_V4_1
|
|
|
|
#define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
|
|
|
|
enum {
|
|
NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
|
|
NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
|
|
NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */
|
|
NFS_LAYOUT_ROC, /* some lseg had roc bit set */
|
|
NFS_LAYOUT_DESTROYED, /* no new use of layout allowed */
|
|
};
|
|
|
|
/* Per-layout driver specific registration structure */
|
|
struct pnfs_layoutdriver_type {
|
|
struct list_head pnfs_tblid;
|
|
const u32 id;
|
|
const char *name;
|
|
struct module *owner;
|
|
struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr);
|
|
void (*free_lseg) (struct pnfs_layout_segment *lseg);
|
|
|
|
/* test for nfs page cache coalescing */
|
|
int (*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *, struct nfs_page *);
|
|
|
|
/* 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);
|
|
|
|
/*
|
|
* 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);
|
|
enum pnfs_try_status (*write_pagelist) (struct nfs_write_data *nfs_data, int how);
|
|
};
|
|
|
|
struct pnfs_layout_hdr {
|
|
atomic_t plh_refcount;
|
|
struct list_head plh_layouts; /* other client layouts */
|
|
struct list_head plh_bulk_recall; /* clnt list of bulk recalls */
|
|
struct list_head plh_segs; /* layout segments list */
|
|
nfs4_stateid plh_stateid;
|
|
atomic_t plh_outstanding; /* number of RPCs out */
|
|
unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
|
|
u32 plh_barrier; /* ignore lower seqids */
|
|
unsigned long plh_flags;
|
|
struct inode *plh_inode;
|
|
};
|
|
|
|
struct pnfs_device {
|
|
struct nfs4_deviceid dev_id;
|
|
unsigned int layout_type;
|
|
unsigned int mincount;
|
|
struct page **pages;
|
|
void *area;
|
|
unsigned int pgbase;
|
|
unsigned int pglen;
|
|
};
|
|
|
|
extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
|
|
extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
|
|
|
|
/* nfs4proc.c */
|
|
extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
|
|
struct pnfs_device *dev);
|
|
extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp);
|
|
|
|
/* pnfs.c */
|
|
void get_layout_hdr(struct pnfs_layout_hdr *lo);
|
|
void put_lseg(struct pnfs_layout_segment *lseg);
|
|
struct pnfs_layout_segment *
|
|
pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
|
|
enum pnfs_iomode access_type);
|
|
void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
|
|
void unset_pnfs_layoutdriver(struct nfs_server *);
|
|
enum pnfs_try_status pnfs_try_to_write_data(struct nfs_write_data *,
|
|
const struct rpc_call_ops *, int);
|
|
enum pnfs_try_status pnfs_try_to_read_data(struct nfs_read_data *,
|
|
const struct rpc_call_ops *);
|
|
void pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *);
|
|
void pnfs_pageio_init_write(struct nfs_pageio_descriptor *, struct inode *);
|
|
int pnfs_layout_process(struct nfs4_layoutget *lgp);
|
|
void pnfs_free_lseg_list(struct list_head *tmp_list);
|
|
void pnfs_destroy_layout(struct nfs_inode *);
|
|
void pnfs_destroy_all_layouts(struct nfs_client *);
|
|
void put_layout_hdr(struct pnfs_layout_hdr *lo);
|
|
void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
|
|
const nfs4_stateid *new,
|
|
bool update_barrier);
|
|
int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
|
|
struct pnfs_layout_hdr *lo,
|
|
struct nfs4_state *open_state);
|
|
int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
|
|
struct list_head *tmp_list,
|
|
u32 iomode);
|
|
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);
|
|
|
|
|
|
static inline int lo_fail_bit(u32 iomode)
|
|
{
|
|
return iomode == IOMODE_RW ?
|
|
NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
#else /* CONFIG_NFS_V4_1 */
|
|
|
|
static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
|
|
{
|
|
}
|
|
|
|
static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
|
|
{
|
|
}
|
|
|
|
static inline struct pnfs_layout_segment *
|
|
get_lseg(struct pnfs_layout_segment *lseg)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline void put_lseg(struct pnfs_layout_segment *lseg)
|
|
{
|
|
}
|
|
|
|
static inline struct pnfs_layout_segment *
|
|
pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
|
|
enum pnfs_iomode access_type)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline enum pnfs_try_status
|
|
pnfs_try_to_read_data(struct nfs_read_data *data,
|
|
const struct rpc_call_ops *call_ops)
|
|
{
|
|
return PNFS_NOT_ATTEMPTED;
|
|
}
|
|
|
|
static inline enum pnfs_try_status
|
|
pnfs_try_to_write_data(struct nfs_write_data *data,
|
|
const struct rpc_call_ops *call_ops, int how)
|
|
{
|
|
return PNFS_NOT_ATTEMPTED;
|
|
}
|
|
|
|
static inline bool
|
|
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;
|
|
}
|
|
|
|
static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
|
|
{
|
|
}
|
|
|
|
static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
|
|
{
|
|
}
|
|
|
|
static inline void
|
|
pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *ino)
|
|
{
|
|
pgio->pg_test = NULL;
|
|
}
|
|
|
|
static inline void
|
|
pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *ino)
|
|
{
|
|
pgio->pg_test = NULL;
|
|
}
|
|
|
|
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)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_NFS_V4_1 */
|
|
|
|
#endif /* FS_NFS_PNFS_H */
|