pnfs/flexfiles: Add the FlexFile Layout Driver (d67ae825) · Commits · e / devices / android_kernel_fairphone_FP3

fs/nfs/Kconfig

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		@@ -128,6 +128,11 @@ config PNFS_OBJLAYOUT
		depends on NFS_V4_1 && SCSI_OSD_ULD
		default NFS_V4

		config PNFS_FLEXFILE_LAYOUT
		tristate
		depends on NFS_V4_1 && NFS_V3
		default m

		config NFS_V4_1_IMPLEMENTATION_ID_DOMAIN
		string "NFSv4.1 Implementation ID Domain"
		depends on NFS_V4_1

fs/nfs/Makefile

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		@@ -33,3 +33,4 @@ nfsv4-$(CONFIG_NFS_V4_2) += nfs42proc.o
		obj-$(CONFIG_PNFS_FILE_LAYOUT) += filelayout/
		obj-$(CONFIG_PNFS_OBJLAYOUT) += objlayout/
		obj-$(CONFIG_PNFS_BLOCK) += blocklayout/
		obj-$(CONFIG_PNFS_FLEXFILE_LAYOUT) += flexfilelayout/

fs/nfs/flexfilelayout/Makefile

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		#
		# Makefile for the pNFS Flexfile Layout Driver kernel module
		#
		obj-$(CONFIG_PNFS_FLEXFILE_LAYOUT) += nfs_layout_flexfiles.o
		nfs_layout_flexfiles-y := flexfilelayout.o flexfilelayoutdev.o

fs/nfs/flexfilelayout/flexfilelayout.c

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File added.

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fs/nfs/flexfilelayout/flexfilelayout.h

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		/*
		* 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

		#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

		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_layout_mirror {
		u32 ds_count;
		u32 efficiency;
		struct nfs4_ff_layout_ds *mirror_ds;
		u32 fh_versions_cnt;
		struct nfs_fh *fh_versions;
		nfs4_stateid stateid;
		struct nfs4_string user_name;
		struct nfs4_string group_name;
		u32 uid;
		u32 gid;
		struct rpc_cred *cred;
		spinlock_t lock;
		};

		struct nfs4_ff_layout_segment {
		struct pnfs_layout_segment generic_hdr;
		u64 stripe_unit;
		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 error_list; /* nfs4_ff_layout_ds_err */
		};

		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_test_devid_unavailable(struct nfs4_deviceid_node *node)
		{
		return nfs4_test_deviceid_unavailable(node);
		}

		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 nfs4_flexfile_layout *flo,
		struct xdr_stream xdr, int count,
		const struct pnfs_layout_range *range);
		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_has_available_ds(struct pnfs_layout_segment *lseg);
		#endif /* FS_NFS_NFS4FLEXFILELAYOUT_H */