fatfs: port to libdiskfs' node cache

* fatfs/inode.c: Drop all cache-related code.
(diskfs_user_make_node): New function.
(diskfs_cached_lookup_in_dirbuf): Reimplement using the `lookup_context'.
(read_node): Rename to diskfs_user_read_node and adopt accordingly.
(diskfs_try_dropping_softrefs): Rename to `diskfs_user_try_dropping_softrefs'.
(diskfs_node_reload): Pass context to `diskfs_user_read_node'.
(diskfs_alloc_node): Pass `dir' via context to `diskfs_user_read_node'.
* fatfs/fatfs.h (struct disknode): Drop fields `hnext', `hprevp'.
(struct lookup_context): New definition.
(ifind): Drop declaration.
* fatfs/dir.c (diskfs_lookup_hard): Adjust accordingly.
* fatfs/main.c (fetch_root): Likewise.

1 files changed, 12 insertions, 5 deletions

diff --git a/fatfs/fatfs.h b/fatfs/fatfs.h
index 9d385463..3c3d8366 100644
--- a/fatfs/fatfs.h
+++ b/fatfs/fatfs.h
@@ -36,9 +36,6 @@ struct disknode
 {
   cluster_t start_cluster;
 
-  /* Links on hash list.  */
-  struct node *hnext, **hprevp;
-
   /* The inode as returned by virtual inode management routines.  */
   inode_t inode;
 
@@ -71,6 +68,18 @@ struct disknode
   int dir_idx;
 };
 
+struct lookup_context
+{
+  /* The inode as returned by virtual inode management routines.  */
+  inode_t inode;
+
+  /* Use BUF as the directory file map.  */
+  vm_address_t buf;
+
+  /* Directory this node was allocated in (used by diskfs_alloc_node).  */
+  struct node *dir;
+};
+
 struct user_pager_info
 {
   struct node *node;
@@ -117,8 +126,6 @@ void flush_node_pager (struct node *node);
 
 void write_all_disknodes ();
 
-struct node *ifind (ino_t inum);
-
 error_t fat_get_next_cluster (cluster_t cluster, cluster_t *next_cluster);
 void fat_to_unix_filename (const char *, char *);