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afs: Split the directory content defs into a header
Split the directory content definitions into a header file so that they can be used by multiple .c files. Signed-off-by: David Howells <dhowells@redhat.com>
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parent
f3ddee8dc4
commit
4ea219a839
56
fs/afs/dir.c
56
fs/afs/dir.c
@ -18,6 +18,7 @@
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#include <linux/sched.h>
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#include <linux/task_io_accounting_ops.h>
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#include "internal.h"
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#include "xdr_fs.h"
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static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
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unsigned int flags);
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@ -86,55 +87,6 @@ const struct dentry_operations afs_fs_dentry_operations = {
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.d_automount = afs_d_automount,
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};
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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_DIRENT_PER_BLOCK 64
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union afs_dirent {
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struct {
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uint8_t valid;
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uint8_t 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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uint8_t name[16];
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uint8_t overflow[4]; /* if any char of the name (inc
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* NUL) reaches here, consume
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* the next dirent too */
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} u;
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uint8_t extended_name[32];
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};
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/* AFS directory page header (one at the beginning of every 2048-byte chunk) */
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struct afs_dir_pagehdr {
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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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uint8_t nentries;
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uint8_t bitmap[8];
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uint8_t pad[19];
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};
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/* directory block layout */
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union afs_dir_block {
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struct afs_dir_pagehdr pagehdr;
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struct {
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struct afs_dir_pagehdr pagehdr;
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uint8_t alloc_ctrs[128];
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/* dir hash table */
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uint16_t hashtable[AFS_DIR_HASHTBL_SIZE];
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} hdr;
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union afs_dirent dirents[AFS_DIRENT_PER_BLOCK];
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};
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/* layout on a linux VM page */
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struct afs_dir_page {
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union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)];
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};
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struct afs_lookup_one_cookie {
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struct dir_context ctx;
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struct qstr name;
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@ -371,8 +323,8 @@ static int afs_dir_iterate_block(struct dir_context *ctx,
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curr = (ctx->pos - blkoff) / sizeof(union afs_dirent);
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/* walk through the block, an entry at a time */
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for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries;
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offset < AFS_DIRENT_PER_BLOCK;
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for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS);
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offset < AFS_DIR_SLOTS_PER_BLOCK;
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offset = next
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) {
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next = offset + 1;
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@ -401,7 +353,7 @@ static int afs_dir_iterate_block(struct dir_context *ctx,
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/* work out where the next possible entry is */
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for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) {
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if (next >= AFS_DIRENT_PER_BLOCK) {
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if (next >= AFS_DIR_SLOTS_PER_BLOCK) {
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_debug("ENT[%zu.%u]:"
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" %u travelled beyond end dir block"
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" (len %u/%zu)",
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@ -37,4 +37,67 @@ struct afs_xdr_AFSFetchStatus {
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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_dirent {
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struct {
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uint8_t valid;
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uint8_t 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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uint8_t name[16];
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uint8_t overflow[4]; /* if any char of the name (inc
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* NUL) reaches here, consume
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* the next dirent too */
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} u;
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uint8_t extended_name[32];
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};
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/*
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* Directory page header (one at the beginning of every 2048-byte chunk).
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*/
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struct afs_dir_pagehdr {
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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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uint8_t reserved;
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uint8_t bitmap[8];
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uint8_t pad[19];
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};
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/*
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* Directory block layout
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*/
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union afs_dir_block {
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struct afs_dir_pagehdr pagehdr;
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struct {
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struct afs_dir_pagehdr pagehdr;
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uint8_t alloc_ctrs[AFS_DIR_MAX_BLOCKS];
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__be16 hashtable[AFS_DIR_HASHTBL_SIZE];
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} hdr;
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union afs_dirent dirents[AFS_DIR_SLOTS_PER_BLOCK];
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};
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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_dir_page {
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union afs_dir_block blocks[AFS_DIR_BLOCKS_PER_PAGE];
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};
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#endif /* XDR_FS_H */
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