/* SPDX-License-Identifier: GPL-2.0-or-later */ /* AFS fileserver XDR types * * Copyright (C) 2018 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) */ #ifndef XDR_FS_H #define XDR_FS_H struct afs_xdr_AFSFetchStatus { __be32 if_version; #define AFS_FSTATUS_VERSION 1 __be32 type; __be32 nlink; __be32 size_lo; __be32 data_version_lo; __be32 author; __be32 owner; __be32 caller_access; __be32 anon_access; __be32 mode; __be32 parent_vnode; __be32 parent_unique; __be32 seg_size; __be32 mtime_client; __be32 mtime_server; __be32 group; __be32 sync_counter; __be32 data_version_hi; __be32 lock_count; __be32 size_hi; __be32 abort_code; } __packed; #define AFS_DIR_HASHTBL_SIZE 128 #define AFS_DIR_DIRENT_SIZE 32 #define AFS_DIR_SLOTS_PER_BLOCK 64 #define AFS_DIR_BLOCK_SIZE 2048 #define AFS_DIR_BLOCKS_PER_PAGE (PAGE_SIZE / AFS_DIR_BLOCK_SIZE) #define AFS_DIR_MAX_SLOTS 65536 #define AFS_DIR_BLOCKS_WITH_CTR 128 #define AFS_DIR_MAX_BLOCKS 1023 #define AFS_DIR_RESV_BLOCKS 1 #define AFS_DIR_RESV_BLOCKS0 13 /* * Directory entry structure. */ union afs_xdr_dirent { struct { u8 valid; u8 unused[1]; __be16 hash_next; __be32 vnode; __be32 unique; u8 name[]; /* When determining the number of dirent slots needed to * represent a directory entry, name should be assumed to be 16 * bytes, due to a now-standardised (mis)calculation, but it is * in fact 20 bytes in size. afs_dir_calc_slots() should be * used for this. * * For names longer than (16 or) 20 bytes, extra slots should * be annexed to this one using the extended_name format. */ } u; u8 extended_name[32]; } __packed; /* * Directory block header (one at the beginning of every 2048-byte block). */ struct afs_xdr_dir_hdr { __be16 npages; __be16 magic; #define AFS_DIR_MAGIC htons(1234) u8 reserved; u8 bitmap[8]; u8 pad[19]; } __packed; /* * Directory block layout */ union afs_xdr_dir_block { struct afs_xdr_dir_hdr hdr; struct { struct afs_xdr_dir_hdr hdr; u8 alloc_ctrs[AFS_DIR_BLOCKS_WITH_CTR]; __be16 hashtable[AFS_DIR_HASHTBL_SIZE]; } meta; union afs_xdr_dirent dirents[AFS_DIR_SLOTS_PER_BLOCK]; } __packed; /* * Directory layout on a linux VM page. */ struct afs_xdr_dir_page { union afs_xdr_dir_block blocks[AFS_DIR_BLOCKS_PER_PAGE]; }; /* * Calculate the number of dirent slots required for any given name length. * The calculation is made assuming the part of the name in the first slot is * 16 bytes, rather than 20, but this miscalculation is now standardised. */ static inline unsigned int afs_dir_calc_slots(size_t name_len) { name_len++; /* NUL-terminated */ return 1 + ((name_len + 15) / AFS_DIR_DIRENT_SIZE); } #endif /* XDR_FS_H */