cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

filelayout.h (3860B)

      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
     44enum stripetype4 {
     45	STRIPE_SPARSE = 1,
     46	STRIPE_DENSE = 2
     47};
     48
     49struct 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
     57struct 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
     70struct nfs4_filelayout {
     71	struct pnfs_layout_hdr generic_hdr;
     72	struct pnfs_ds_commit_info commit_info;
     73};
     74
     75static inline struct nfs4_filelayout *
     76FILELAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo)
     77{
     78	return container_of(lo, struct nfs4_filelayout, generic_hdr);
     79}
     80
     81static inline struct nfs4_filelayout_segment *
     82FILELAYOUT_LSEG(struct pnfs_layout_segment *lseg)
     83{
     84	return container_of(lseg,
     85			    struct nfs4_filelayout_segment,
     86			    generic_hdr);
     87}
     88
     89static inline struct nfs4_deviceid_node *
     90FILELAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg)
     91{
     92	return &FILELAYOUT_LSEG(lseg)->dsaddr->id_node;
     93}
     94
     95static inline bool
     96filelayout_test_devid_invalid(struct nfs4_deviceid_node *node)
     97{
     98	return test_bit(NFS_DEVICEID_INVALID, &node->flags);
     99}
    100
    101extern bool
    102filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node);
    103
    104extern struct nfs_fh *
    105nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j);
    106
    107u32 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset);
    108u32 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j);
    109struct nfs4_pnfs_ds *nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg,
    110					u32 ds_idx);
    111
    112extern struct nfs4_file_layout_dsaddr *
    113nfs4_fl_alloc_deviceid_node(struct nfs_server *server,
    114	struct pnfs_device *pdev, gfp_t gfp_flags);
    115extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
    116extern void nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
    117
    118#endif /* FS_NFS_NFS4FILELAYOUT_H */