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