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118 lines
3.8 KiB
118 lines
3.8 KiB
/* |
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* NFSv4 file layout driver data structures. |
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* |
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* Copyright (c) 2002 |
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* The Regents of the University of Michigan |
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* All Rights Reserved |
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* |
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* Dean Hildebrand <[email protected]> |
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* |
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* Permission is granted to use, copy, create derivative works, and |
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* redistribute this software and such derivative works for any purpose, |
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* so long as the name of the University of Michigan is not used in |
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* any advertising or publicity pertaining to the use or distribution |
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* of this software without specific, written prior authorization. If |
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* the above copyright notice or any other identification of the |
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* University of Michigan is included in any copy of any portion of |
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* this software, then the disclaimer below must also be included. |
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* |
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* This software is provided as is, without representation or warranty |
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* of any kind either express or implied, including without limitation |
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* the implied warranties of merchantability, fitness for a particular |
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* purpose, or noninfringement. The Regents of the University of |
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* Michigan shall not be liable for any damages, including special, |
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* indirect, incidental, or consequential damages, with respect to any |
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* claim arising out of or in connection with the use of the software, |
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* even if it has been or is hereafter advised of the possibility of |
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* such damages. |
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*/ |
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#ifndef FS_NFS_NFS4FILELAYOUT_H |
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#define FS_NFS_NFS4FILELAYOUT_H |
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#include "../pnfs.h" |
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/* |
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* Field testing shows we need to support up to 4096 stripe indices. |
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* We store each index as a u8 (u32 on the wire) to keep the memory footprint |
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* reasonable. This in turn means we support a maximum of 256 |
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* RFC 5661 multipath_list4 structures. |
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*/ |
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#define NFS4_PNFS_MAX_STRIPE_CNT 4096 |
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#define NFS4_PNFS_MAX_MULTI_CNT 256 /* 256 fit into a u8 stripe_index */ |
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enum stripetype4 { |
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STRIPE_SPARSE = 1, |
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STRIPE_DENSE = 2 |
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}; |
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struct nfs4_file_layout_dsaddr { |
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struct nfs4_deviceid_node id_node; |
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u32 stripe_count; |
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u8 *stripe_indices; |
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u32 ds_num; |
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struct nfs4_pnfs_ds *ds_list[1]; |
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}; |
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struct nfs4_filelayout_segment { |
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struct pnfs_layout_segment generic_hdr; |
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u32 stripe_type; |
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u32 commit_through_mds; |
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u32 stripe_unit; |
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u32 first_stripe_index; |
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u64 pattern_offset; |
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struct nfs4_deviceid deviceid; |
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struct nfs4_file_layout_dsaddr *dsaddr; /* Point to GETDEVINFO data */ |
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unsigned int num_fh; |
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struct nfs_fh **fh_array; |
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}; |
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struct nfs4_filelayout { |
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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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}; |
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static inline struct nfs4_filelayout * |
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FILELAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo) |
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{ |
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return container_of(lo, struct nfs4_filelayout, generic_hdr); |
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} |
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static inline struct nfs4_filelayout_segment * |
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FILELAYOUT_LSEG(struct pnfs_layout_segment *lseg) |
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{ |
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return container_of(lseg, |
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struct nfs4_filelayout_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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FILELAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg) |
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{ |
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return &FILELAYOUT_LSEG(lseg)->dsaddr->id_node; |
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} |
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static inline bool |
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filelayout_test_devid_invalid(struct nfs4_deviceid_node *node) |
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{ |
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return test_bit(NFS_DEVICEID_INVALID, &node->flags); |
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} |
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extern bool |
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filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node); |
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extern struct nfs_fh * |
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nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j); |
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u32 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset); |
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u32 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j); |
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struct nfs4_pnfs_ds *nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, |
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u32 ds_idx); |
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extern struct nfs4_file_layout_dsaddr * |
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nfs4_fl_alloc_deviceid_node(struct nfs_server *server, |
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struct pnfs_device *pdev, gfp_t gfp_flags); |
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extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr); |
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extern void nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr); |
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#endif /* FS_NFS_NFS4FILELAYOUT_H */
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