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