b4d0d230ccfb5 (Thomas Gleixner 2019-05-20 19:08:01 +0200 1) /* SPDX-License-Identifier: GPL-2.0-or-later */
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 2) /* AFS fileserver XDR types
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 3) *
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 4) * Copyright (C) 2018 Red Hat, Inc. All Rights Reserved.
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 5) * Written by David Howells (dhowells@redhat.com)
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 6) */
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 7)
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 8) #ifndef XDR_FS_H
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 9) #define XDR_FS_H
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 10)
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 11) struct afs_xdr_AFSFetchStatus {
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 12) __be32 if_version;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 13) #define AFS_FSTATUS_VERSION 1
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 14) __be32 type;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 15) __be32 nlink;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 16) __be32 size_lo;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 17) __be32 data_version_lo;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 18) __be32 author;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 19) __be32 owner;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 20) __be32 caller_access;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 21) __be32 anon_access;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 22) __be32 mode;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 23) __be32 parent_vnode;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 24) __be32 parent_unique;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 25) __be32 seg_size;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 26) __be32 mtime_client;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 27) __be32 mtime_server;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 28) __be32 group;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 29) __be32 sync_counter;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 30) __be32 data_version_hi;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 31) __be32 lock_count;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 32) __be32 size_hi;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 33) __be32 abort_code;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 34) } __packed;
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 35)
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 36) #define AFS_DIR_HASHTBL_SIZE 128
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 37) #define AFS_DIR_DIRENT_SIZE 32
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 38) #define AFS_DIR_SLOTS_PER_BLOCK 64
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 39) #define AFS_DIR_BLOCK_SIZE 2048
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 40) #define AFS_DIR_BLOCKS_PER_PAGE (PAGE_SIZE / AFS_DIR_BLOCK_SIZE)
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 41) #define AFS_DIR_MAX_SLOTS 65536
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 42) #define AFS_DIR_BLOCKS_WITH_CTR 128
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 43) #define AFS_DIR_MAX_BLOCKS 1023
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 44) #define AFS_DIR_RESV_BLOCKS 1
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 45) #define AFS_DIR_RESV_BLOCKS0 13
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 46)
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 47) /*
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 48) * Directory entry structure.
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 49) */
0031763698d19 (David Howells 2018-04-06 14:17:25 +0100 50) union afs_xdr_dirent {
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 51) struct {
0031763698d19 (David Howells 2018-04-06 14:17:25 +0100 52) u8 valid;
0031763698d19 (David Howells 2018-04-06 14:17:25 +0100 53) u8 unused[1];
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 54) __be16 hash_next;
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 55) __be32 vnode;
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 56) __be32 unique;
26982a89cad77 (David Howells 2020-12-21 22:37:58 +0000 57) u8 name[];
26982a89cad77 (David Howells 2020-12-21 22:37:58 +0000 58) /* When determining the number of dirent slots needed to
26982a89cad77 (David Howells 2020-12-21 22:37:58 +0000 59) * represent a directory entry, name should be assumed to be 16
26982a89cad77 (David Howells 2020-12-21 22:37:58 +0000 60) * bytes, due to a now-standardised (mis)calculation, but it is
366911cd762db (David Howells 2020-12-23 10:39:57 +0000 61) * in fact 20 bytes in size. afs_dir_calc_slots() should be
366911cd762db (David Howells 2020-12-23 10:39:57 +0000 62) * used for this.
26982a89cad77 (David Howells 2020-12-21 22:37:58 +0000 63) *
26982a89cad77 (David Howells 2020-12-21 22:37:58 +0000 64) * For names longer than (16 or) 20 bytes, extra slots should
26982a89cad77 (David Howells 2020-12-21 22:37:58 +0000 65) * be annexed to this one using the extended_name format.
26982a89cad77 (David Howells 2020-12-21 22:37:58 +0000 66) */
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 67) } u;
0031763698d19 (David Howells 2018-04-06 14:17:25 +0100 68) u8 extended_name[32];
0031763698d19 (David Howells 2018-04-06 14:17:25 +0100 69) } __packed;
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 70)
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 71) /*
0031763698d19 (David Howells 2018-04-06 14:17:25 +0100 72) * Directory block header (one at the beginning of every 2048-byte block).
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 73) */
0031763698d19 (David Howells 2018-04-06 14:17:25 +0100 74) struct afs_xdr_dir_hdr {
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 75) __be16 npages;
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 76) __be16 magic;
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 77) #define AFS_DIR_MAGIC htons(1234)
0031763698d19 (David Howells 2018-04-06 14:17:25 +0100 78) u8 reserved;
0031763698d19 (David Howells 2018-04-06 14:17:25 +0100 79) u8 bitmap[8];
0031763698d19 (David Howells 2018-04-06 14:17:25 +0100 80) u8 pad[19];
0031763698d19 (David Howells 2018-04-06 14:17:25 +0100 81) } __packed;
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 82)
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 83) /*
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 84) * Directory block layout
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 85) */
0031763698d19 (David Howells 2018-04-06 14:17:25 +0100 86) union afs_xdr_dir_block {
0031763698d19 (David Howells 2018-04-06 14:17:25 +0100 87) struct afs_xdr_dir_hdr hdr;
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 88)
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 89) struct {
0031763698d19 (David Howells 2018-04-06 14:17:25 +0100 90) struct afs_xdr_dir_hdr hdr;
0031763698d19 (David Howells 2018-04-06 14:17:25 +0100 91) u8 alloc_ctrs[AFS_DIR_MAX_BLOCKS];
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 92) __be16 hashtable[AFS_DIR_HASHTBL_SIZE];
0031763698d19 (David Howells 2018-04-06 14:17:25 +0100 93) } meta;
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 94)
0031763698d19 (David Howells 2018-04-06 14:17:25 +0100 95) union afs_xdr_dirent dirents[AFS_DIR_SLOTS_PER_BLOCK];
0031763698d19 (David Howells 2018-04-06 14:17:25 +0100 96) } __packed;
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 97)
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 98) /*
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 99) * Directory layout on a linux VM page.
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 100) */
0031763698d19 (David Howells 2018-04-06 14:17:25 +0100 101) struct afs_xdr_dir_page {
0031763698d19 (David Howells 2018-04-06 14:17:25 +0100 102) union afs_xdr_dir_block blocks[AFS_DIR_BLOCKS_PER_PAGE];
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 103) };
4ea219a839bf8 (David Howells 2018-04-06 14:17:25 +0100 104)
366911cd762db (David Howells 2020-12-23 10:39:57 +0000 105) /*
366911cd762db (David Howells 2020-12-23 10:39:57 +0000 106) * Calculate the number of dirent slots required for any given name length.
366911cd762db (David Howells 2020-12-23 10:39:57 +0000 107) * The calculation is made assuming the part of the name in the first slot is
366911cd762db (David Howells 2020-12-23 10:39:57 +0000 108) * 16 bytes, rather than 20, but this miscalculation is now standardised.
366911cd762db (David Howells 2020-12-23 10:39:57 +0000 109) */
366911cd762db (David Howells 2020-12-23 10:39:57 +0000 110) static inline unsigned int afs_dir_calc_slots(size_t name_len)
366911cd762db (David Howells 2020-12-23 10:39:57 +0000 111) {
366911cd762db (David Howells 2020-12-23 10:39:57 +0000 112) name_len++; /* NUL-terminated */
366911cd762db (David Howells 2020-12-23 10:39:57 +0000 113) return 1 + ((name_len + 15) / AFS_DIR_DIRENT_SIZE);
366911cd762db (David Howells 2020-12-23 10:39:57 +0000 114) }
366911cd762db (David Howells 2020-12-23 10:39:57 +0000 115)
dd9fbcb8e1034 (David Howells 2018-04-06 14:17:24 +0100 116) #endif /* XDR_FS_H */
VisionFive2 Linux kernel
StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)
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