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afs: Split the directory content defs into a header

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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>
This commit is contained in:
David Howells 2018-04-06 14:17:25 +01:00
parent f3ddee8dc4
commit 4ea219a839
2 changed files with 67 additions and 52 deletions
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56
fs/afs/dir.c
View File

@ -18,6 +18,7 @@
#include <linux/sched.h>
#include <linux/task_io_accounting_ops.h>
#include "internal.h"
#include "xdr_fs.h"
static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags);
@ -86,55 +87,6 @@ const struct dentry_operations afs_fs_dentry_operations = {
.d_automount = afs_d_automount,
};
#define AFS_DIR_HASHTBL_SIZE 128
#define AFS_DIR_DIRENT_SIZE 32
#define AFS_DIRENT_PER_BLOCK 64
union afs_dirent {
struct {
uint8_t valid;
uint8_t unused[1];
__be16 hash_next;
__be32 vnode;
__be32 unique;
uint8_t name[16];
uint8_t overflow[4]; /* if any char of the name (inc
* NUL) reaches here, consume
* the next dirent too */
} u;
uint8_t extended_name[32];
};
/* AFS directory page header (one at the beginning of every 2048-byte chunk) */
struct afs_dir_pagehdr {
__be16 npages;
__be16 magic;
#define AFS_DIR_MAGIC htons(1234)
uint8_t nentries;
uint8_t bitmap[8];
uint8_t pad[19];
};
/* directory block layout */
union afs_dir_block {
struct afs_dir_pagehdr pagehdr;
struct {
struct afs_dir_pagehdr pagehdr;
uint8_t alloc_ctrs[128];
/* dir hash table */
uint16_t hashtable[AFS_DIR_HASHTBL_SIZE];
} hdr;
union afs_dirent dirents[AFS_DIRENT_PER_BLOCK];
};
/* layout on a linux VM page */
struct afs_dir_page {
union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)];
};
struct afs_lookup_one_cookie {
struct dir_context ctx;
struct qstr name;
@ -371,8 +323,8 @@ static int afs_dir_iterate_block(struct dir_context *ctx,
curr = (ctx->pos - blkoff) / sizeof(union afs_dirent);
/* walk through the block, an entry at a time */
for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries;
offset < AFS_DIRENT_PER_BLOCK;
for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS);
offset < AFS_DIR_SLOTS_PER_BLOCK;
offset = next
) {
next = offset + 1;
@ -401,7 +353,7 @@ static int afs_dir_iterate_block(struct dir_context *ctx,
/* work out where the next possible entry is */
for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) {
if (next >= AFS_DIRENT_PER_BLOCK) {
if (next >= AFS_DIR_SLOTS_PER_BLOCK) {
_debug("ENT[%zu.%u]:"
" %u travelled beyond end dir block"
" (len %u/%zu)",

63
fs/afs/xdr_fs.h
View File

@ -37,4 +37,67 @@ struct afs_xdr_AFSFetchStatus {
__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_dirent {
struct {
uint8_t valid;
uint8_t unused[1];
__be16 hash_next;
__be32 vnode;
__be32 unique;
uint8_t name[16];
uint8_t overflow[4]; /* if any char of the name (inc
* NUL) reaches here, consume
* the next dirent too */
} u;
uint8_t extended_name[32];
};
/*
* Directory page header (one at the beginning of every 2048-byte chunk).
*/
struct afs_dir_pagehdr {
__be16 npages;
__be16 magic;
#define AFS_DIR_MAGIC htons(1234)
uint8_t reserved;
uint8_t bitmap[8];
uint8_t pad[19];
};
/*
* Directory block layout
*/
union afs_dir_block {
struct afs_dir_pagehdr pagehdr;
struct {
struct afs_dir_pagehdr pagehdr;
uint8_t alloc_ctrs[AFS_DIR_MAX_BLOCKS];
__be16 hashtable[AFS_DIR_HASHTBL_SIZE];
} hdr;
union afs_dirent dirents[AFS_DIR_SLOTS_PER_BLOCK];
};
/*
* Directory layout on a linux VM page.
*/
struct afs_dir_page {
union afs_dir_block blocks[AFS_DIR_BLOCKS_PER_PAGE];
};
#endif /* XDR_FS_H */