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Subject[PATCH 15/20] afs: Split the directory content defs into a header
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Date
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>
---

fs/afs/dir.c | 56 +++----------------------------------------------
fs/afs/xdr_fs.h | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 67 insertions(+), 52 deletions(-)

diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index e989a8fe9a9b..31703f93a90b 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -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)",
diff --git a/fs/afs/xdr_fs.h b/fs/afs/xdr_fs.h
index 24e23e40c979..63e87ccbb55b 100644
--- a/fs/afs/xdr_fs.h
+++ b/fs/afs/xdr_fs.h
@@ -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 */
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