1 /* 2 * NFSv4 file layout driver data structures. 3 * 4 * Copyright (c) 2002 5 * The Regents of the University of Michigan 6 * All Rights Reserved 7 * 8 * Dean Hildebrand <dhildebz@umich.edu> 9 * 10 * Permission is granted to use, copy, create derivative works, and 11 * redistribute this software and such derivative works for any purpose, 12 * so long as the name of the University of Michigan is not used in 13 * any advertising or publicity pertaining to the use or distribution 14 * of this software without specific, written prior authorization. If 15 * the above copyright notice or any other identification of the 16 * University of Michigan is included in any copy of any portion of 17 * this software, then the disclaimer below must also be included. 18 * 19 * This software is provided as is, without representation or warranty 20 * of any kind either express or implied, including without limitation 21 * the implied warranties of merchantability, fitness for a particular 22 * purpose, or noninfringement. The Regents of the University of 23 * Michigan shall not be liable for any damages, including special, 24 * indirect, incidental, or consequential damages, with respect to any 25 * claim arising out of or in connection with the use of the software, 26 * even if it has been or is hereafter advised of the possibility of 27 * such damages. 28 */ 29 30 #ifndef FS_NFS_NFS4FILELAYOUT_H 31 #define FS_NFS_NFS4FILELAYOUT_H 32 33 #include "../pnfs.h" 34 35 /* 36 * Field testing shows we need to support up to 4096 stripe indices. 37 * We store each index as a u8 (u32 on the wire) to keep the memory footprint 38 * reasonable. This in turn means we support a maximum of 256 39 * RFC 5661 multipath_list4 structures. 40 */ 41 #define NFS4_PNFS_MAX_STRIPE_CNT 4096 42 #define NFS4_PNFS_MAX_MULTI_CNT 256 /* 256 fit into a u8 stripe_index */ 43 44 enum stripetype4 { 45 STRIPE_SPARSE = 1, 46 STRIPE_DENSE = 2 47 }; 48 49 struct nfs4_file_layout_dsaddr { 50 struct nfs4_deviceid_node id_node; 51 u32 stripe_count; 52 u8 *stripe_indices; 53 u32 ds_num; 54 struct nfs4_pnfs_ds *ds_list[]; 55 }; 56 57 struct nfs4_filelayout_segment { 58 struct pnfs_layout_segment generic_hdr; 59 u32 stripe_type; 60 u32 commit_through_mds; 61 u32 stripe_unit; 62 u32 first_stripe_index; 63 u64 pattern_offset; 64 struct nfs4_deviceid deviceid; 65 struct nfs4_file_layout_dsaddr *dsaddr; /* Point to GETDEVINFO data */ 66 unsigned int num_fh; 67 struct nfs_fh **fh_array; 68 }; 69 70 struct nfs4_filelayout { 71 struct pnfs_layout_hdr generic_hdr; 72 struct pnfs_ds_commit_info commit_info; 73 }; 74 75 static inline struct nfs4_filelayout * 76 FILELAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo) 77 { 78 return container_of(lo, struct nfs4_filelayout, generic_hdr); 79 } 80 81 static inline struct nfs4_filelayout_segment * 82 FILELAYOUT_LSEG(struct pnfs_layout_segment *lseg) 83 { 84 return container_of(lseg, 85 struct nfs4_filelayout_segment, 86 generic_hdr); 87 } 88 89 static inline struct nfs4_deviceid_node * 90 FILELAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg) 91 { 92 return &FILELAYOUT_LSEG(lseg)->dsaddr->id_node; 93 } 94 95 static inline bool 96 filelayout_test_devid_invalid(struct nfs4_deviceid_node *node) 97 { 98 return test_bit(NFS_DEVICEID_INVALID, &node->flags); 99 } 100 101 extern bool 102 filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node); 103 104 extern struct nfs_fh * 105 nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j); 106 107 u32 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset); 108 u32 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j); 109 struct nfs4_pnfs_ds *nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, 110 u32 ds_idx); 111 112 extern struct nfs4_file_layout_dsaddr * 113 nfs4_fl_alloc_deviceid_node(struct nfs_server *server, 114 struct pnfs_device *pdev, gfp_t gfp_flags); 115 extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr); 116 extern void nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr); 117 118 #endif /* FS_NFS_NFS4FILELAYOUT_H */ 119