/*
* NFSv4 flexfile layout driver data structures.
*
* Copyright (c) 2014, Primary Data, Inc. All rights reserved.
*
* Tao Peng <bergwolf@primarydata.com>
*/
#ifndef FS_NFS_NFS4FLEXFILELAYOUT_H
#define FS_NFS_NFS4FLEXFILELAYOUT_H
#define FF_FLAGS_NO_LAYOUTCOMMIT 1
#define FF_FLAGS_NO_IO_THRU_MDS 2
#define FF_FLAGS_NO_READ_IO 4
#include "../pnfs.h"
/* XXX: Let's filter out insanely large mirror count for now to avoid oom
* due to network error etc. */
#define NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT 4096
/* LAYOUTSTATS report interval in ms */
#define FF_LAYOUTSTATS_REPORT_INTERVAL (60000L)
#define FF_LAYOUTSTATS_MAXDEV 4
struct nfs4_ff_ds_version {
u32 version;
u32 minor_version;
u32 rsize;
u32 wsize;
bool tightly_coupled;
};
/* chained in global deviceid hlist */
struct nfs4_ff_layout_ds {
struct nfs4_deviceid_node id_node;
u32 ds_versions_cnt;
struct nfs4_ff_ds_version *ds_versions;
struct nfs4_pnfs_ds *ds;
};
struct nfs4_ff_layout_ds_err {
struct list_head list; /* linked in mirror error_list */
u64 offset;
u64 length;
int status;
enum nfs_opnum4 opnum;
nfs4_stateid stateid;
struct nfs4_deviceid deviceid;
};
struct nfs4_ff_io_stat {
__u64 ops_requested;
__u64 bytes_requested;
__u64 ops_completed;
__u64 bytes_completed;
__u64 bytes_not_delivered;
ktime_t total_busy_time;
ktime_t aggregate_completion_time;
};
struct nfs4_ff_busy_timer {
ktime_t start_time;
atomic_t n_ops;
};
struct nfs4_ff_layoutstat {
struct nfs4_ff_io_stat io_stat;
struct nfs4_ff_busy_timer busy_timer;
};
struct nfs4_ff_layout_mirror {
struct pnfs_layout_hdr *layout;
struct list_head mirrors;
u32 ds_count;
u32 efficiency;
struct nfs4_deviceid devid;
struct nfs4_ff_layout_ds *mirror_ds;
u32 fh_versions_cnt;
struct nfs_fh *fh_versions;
nfs4_stateid stateid;
struct rpc_cred __rcu *ro_cred;
struct rpc_cred __rcu *rw_cred;
atomic_t ref;
spinlock_t lock;
unsigned long flags;
struct nfs4_ff_layoutstat read_stat;
struct nfs4_ff_layoutstat write_stat;
ktime_t start_time;
u32 report_interval;
};
#define NFS4_FF_MIRROR_STAT_AVAIL (0)
struct nfs4_ff_layout_segment {
struct pnfs_layout_segment generic_hdr;
u64 stripe_unit;
u32 flags;
u32 mirror_array_cnt;
struct nfs4_ff_layout_mirror **mirror_array;
};
struct nfs4_flexfile_layout {
struct pnfs_layout_hdr generic_hdr;
struct pnfs_ds_commit_info commit_info;
struct list_head mirrors;
struct list_head error_list; /* nfs4_ff_layout_ds_err */
ktime_t last_report_time; /* Layoutstat report times */
};
struct nfs4_flexfile_layoutreturn_args {
struct list_head errors;
struct nfs42_layoutstat_devinfo devinfo[FF_LAYOUTSTATS_MAXDEV];
unsigned int num_errors;
unsigned int num_dev;
struct page *pages[1];
};
static inline struct nfs4_flexfile_layout *
FF_LAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo)
{
return container_of(lo, struct nfs4_flexfile_layout, generic_hdr);
}
static inline struct nfs4_ff_layout_segment *
FF_LAYOUT_LSEG(struct pnfs_layout_segment *lseg)
{
return container_of(lseg,
struct nfs4_ff_layout_segment,
generic_hdr);
}
static inline struct nfs4_deviceid_node *
FF_LAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg, u32 idx)
{
if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt ||
FF_LAYOUT_LSEG(lseg)->mirror_array[idx] == NULL ||
FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds == NULL)
return NULL;
return &FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds->id_node;
}
static inline struct nfs4_ff_layout_ds *
FF_LAYOUT_MIRROR_DS(struct nfs4_deviceid_node *node)
{
return container_of(node, struct nfs4_ff_layout_ds, id_node);
}
static inline struct nfs4_ff_layout_mirror *
FF_LAYOUT_COMP(struct pnfs_layout_segment *lseg, u32 idx)
{
if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt)
return NULL;
return FF_LAYOUT_LSEG(lseg)->mirror_array[idx];
}
static inline u32
FF_LAYOUT_MIRROR_COUNT(struct pnfs_layout_segment *lseg)
{
return FF_LAYOUT_LSEG(lseg)->mirror_array_cnt;
}
static inline bool
ff_layout_no_fallback_to_mds(struct pnfs_layout_segment *lseg)
{
return FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_IO_THRU_MDS;
}
static inline bool
ff_layout_no_read_on_rw(struct pnfs_layout_segment *lseg)
{
return FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_READ_IO;
}
static inline bool
ff_layout_test_devid_unavailable(struct nfs4_deviceid_node *node)
{
/*
* Flexfiles should never mark a DS unavailable, but if it does
* print a (ratelimited) warning as this can affect performance.
*/
if (nfs4_test_deviceid_unavailable(node)) {
u32 *p = (u32 *)node->deviceid.data;
pr_warn_ratelimited("NFS: flexfiles layout referencing an "
"unavailable device [%x%x%x%x]\n",
p[0], p[1], p[2], p[3]);
return true;
}
return false;
}
static inline int
nfs4_ff_layout_ds_version(struct pnfs_layout_segment *lseg, u32 ds_idx)
{
return FF_LAYOUT_COMP(lseg, ds_idx)->mirror_ds->ds_versions[0].version;
}
struct nfs4_ff_layout_ds *
nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
gfp_t gfp_flags);
void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds);
void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds);
int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
struct nfs4_ff_layout_mirror *mirror, u64 offset,
u64 length, int status, enum nfs_opnum4 opnum,
gfp_t gfp_flags);
int ff_layout_encode_ds_ioerr(struct xdr_stream *xdr, const struct list_head *head);
void ff_layout_free_ds_ioerr(struct list_head *head);
unsigned int ff_layout_fetch_ds_ioerr(struct pnfs_layout_hdr *lo,
const struct pnfs_layout_range *range,
struct list_head *head,
unsigned int maxnum);
struct nfs_fh *
nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx);
struct nfs4_pnfs_ds *
nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx,
bool fail_return);
struct rpc_clnt *
nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg,
u32 ds_idx,
struct nfs_client *ds_clp,
struct inode *inode);
struct rpc_cred *ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg,
u32 ds_idx, struct rpc_cred *mdscred);
bool ff_layout_avoid_mds_available_ds(struct pnfs_layout_segment *lseg);
bool ff_layout_avoid_read_on_rw(struct pnfs_layout_segment *lseg);
#endif /* FS_NFS_NFS4FLEXFILELAYOUT_H */