#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 <linux/refcount.h>
#include "../pnfs.h"
#define NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT 4096
#define NFS4_FLEXFILE_LAYOUT_MAX_STRIPE_CNT 4096
#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;
};
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;
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 nfs4_ff_layout_ds_stripe {
struct nfs4_ff_layout_mirror *mirror;
struct nfs4_deviceid devid;
u32 efficiency;
struct nfs4_ff_layout_ds *mirror_ds;
u32 fh_versions_cnt;
struct nfs_fh *fh_versions;
nfs4_stateid stateid;
const struct cred __rcu *ro_cred;
const struct cred __rcu *rw_cred;
struct nfs_file_localio nfl;
struct nfs4_ff_layoutstat read_stat;
struct nfs4_ff_layoutstat write_stat;
ktime_t start_time;
};
struct nfs4_ff_layout_mirror {
struct pnfs_layout_hdr *layout;
struct list_head mirrors;
u32 dss_count;
struct nfs4_ff_layout_ds_stripe *dss;
refcount_t ref;
spinlock_t lock;
unsigned long flags;
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[] __counted_by(mirror_array_cnt);
};
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;
ktime_t last_report_time;
};
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_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)
{
struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
if (idx < fls->mirror_array_cnt)
return fls->mirror_array[idx];
return NULL;
}
static inline struct nfs4_deviceid_node *
FF_LAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg, u32 idx, u32 dss_id)
{
struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, idx);
if (mirror != NULL) {
struct nfs4_ff_layout_ds *mirror_ds = mirror->dss[dss_id].mirror_ds;
if (!IS_ERR_OR_NULL(mirror_ds))
return &mirror_ds->id_node;
}
return NULL;
}
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 int
nfs4_ff_layout_ds_version(const struct nfs4_ff_layout_mirror *mirror, u32 dss_id)
{
return mirror->dss[dss_id].mirror_ds->ds_versions[0].version;
}
static inline u32
nfs4_ff_layout_calc_dss_id(const u64 stripe_unit, const u32 dss_count, const loff_t offset)
{
u64 tmp = offset;
if (dss_count == 1 || stripe_unit == 0)
return 0;
do_div(tmp, stripe_unit);
return do_div(tmp, dss_count);
}
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,
u32 dss_id, u64 offset, u64 length, int status,
enum nfs_opnum4 opnum, gfp_t gfp_flags);
void ff_layout_send_layouterror(struct pnfs_layout_segment *lseg);
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 nfs4_ff_layout_mirror *mirror, u32 dss_id);
void
nfs4_ff_layout_select_ds_stateid(const struct nfs4_ff_layout_mirror *mirror,
u32 dss_id,
nfs4_stateid *stateid);
struct nfs4_pnfs_ds *
nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg,
struct nfs4_ff_layout_mirror *mirror,
u32 dss_id,
bool fail_return);
struct rpc_clnt *
nfs4_ff_find_or_create_ds_client(struct nfs4_ff_layout_mirror *mirror,
struct nfs_client *ds_clp,
struct inode *inode,
u32 dss_id);
const struct cred *ff_layout_get_ds_cred(struct nfs4_ff_layout_mirror *mirror,
const struct pnfs_layout_range *range,
const struct cred *mdscred,
u32 dss_id);
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
