From 2d93495df2dd0c7c61fa73e07bb8fcae3d1ea5fd Mon Sep 17 00:00:00 2001
From: Miika Pekkarinen <miipekk@ihme.org>
Date: Tue, 28 Mar 2006 11:51:12 +0000
Subject: Boost open() performance on platforms with dircache. Tagcache initial
 scanning now over 50% faster than before.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9306 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/common/dircache.c  | 20 +++++++++++++++++---
 firmware/common/file.c      | 37 +++++++++++++++++++++++++++++++++----
 firmware/include/dircache.h |  4 ++--
 3 files changed, 52 insertions(+), 9 deletions(-)

(limited to 'firmware')

diff --git a/firmware/common/dircache.c b/firmware/common/dircache.c
index f9fd63b8e4..873e0f9cf4 100644
--- a/firmware/common/dircache.c
+++ b/firmware/common/dircache.c
@@ -798,12 +798,20 @@ void dircache_bind(int fd, const char *path)
     fd_bindings[fd] = entry;
 }
 
-void dircache_update_filesize(int fd, long newsize)
+void dircache_update_filesize(int fd, long newsize, long startcluster)
 {
     if (!dircache_initialized || fd < 0)
         return ;
 
+    if (fd_bindings[fd] == NULL)
+    {
+        logf("dircache fd access error");
+        dircache_initialized = false;
+        return ;
+    }
+    
     fd_bindings[fd]->size = newsize;
+    fd_bindings[fd]->startcluster = startcluster;
 }
 
 void dircache_mkdir(const char *path)
@@ -915,13 +923,19 @@ void dircache_rename(const char *oldpath, const char *newpath)
     newentry->wrtdate = oldentry.wrtdate;
 }
 
-void dircache_add_file(const char *path)
+void dircache_add_file(const char *path, long startcluster)
 {
+    struct dircache_entry *entry;
+    
     if (!dircache_initialized)
         return ;
         
     logf("add file: %s", path);
-    dircache_new_entry(path, 0);
+    entry = dircache_new_entry(path, 0);
+    if (entry == NULL)
+        return ;
+    
+    entry->startcluster = startcluster;
 }
 
 DIRCACHED* opendir_cached(const char* name)
diff --git a/firmware/common/file.c b/firmware/common/file.c
index 761caeee4b..a0b4296495 100644
--- a/firmware/common/file.c
+++ b/firmware/common/file.c
@@ -99,9 +99,35 @@ int open(const char* pathname, int flags)
     }
     file->busy = true;
 
+#ifdef HAVE_DIRCACHE
+    if (dircache_is_enabled() && !file->write)
+    {
+        const struct dircache_entry *ce;
+        
+        ce = dircache_get_entry_ptr(pathname);
+        if (!ce)
+        {
+            errno = ENOENT;
+            file->busy = false;
+            return -7;
+        }
+        
+        fat_open(IF_MV2(unsupported at the moment,)
+                 ce->startcluster,
+                 &(file->fatfile),
+                 NULL);
+        file->size = ce->size;
+        file->attr = ce->attribute;
+        file->cacheoffset = -1;
+        file->fileoffset = 0;
+        
+        return fd;
+    }
+#endif
+    
     strncpy(pathnamecopy,pathname,sizeof(pathnamecopy));
     pathnamecopy[sizeof(pathnamecopy)-1] = 0;
-
+    
     /* locate filename */
     name=strrchr(pathnamecopy+1,'/');
     if ( name ) {
@@ -120,7 +146,7 @@ int open(const char* pathname, int flags)
         file->busy = false;
         return -4;
     }
-
+    
     if(name[0] == 0) {
         DEBUGF("Empty file name\n");
         errno = EINVAL;
@@ -156,7 +182,7 @@ int open(const char* pathname, int flags)
                 return rc * 10 - 6;
             }
 #ifdef HAVE_DIRCACHE
-            dircache_add_file(pathname);
+            dircache_add_file(pathname, file->fatfile.firstcluster);
 #endif
             file->size = 0;
             file->attr = 0;
@@ -394,6 +420,9 @@ int ftruncate(int fd, off_t size)
     }
 
     file->size = size;
+#ifdef HAVE_DIRCACHE
+    dircache_update_filesize(fd, size, file->fatfile.firstcluster);
+#endif
 
     return 0;
 }
@@ -569,7 +598,7 @@ static int readwrite(int fd, void* buf, long count, bool write)
     {
         file->size = file->fileoffset;
 #ifdef HAVE_DIRCACHE
-        dircache_update_filesize(fd, file->size);
+        dircache_update_filesize(fd, file->size, file->fatfile.firstcluster);
 #endif
     }
 
diff --git a/firmware/include/dircache.h b/firmware/include/dircache.h
index 93bc413dc9..48f29806e3 100644
--- a/firmware/include/dircache.h
+++ b/firmware/include/dircache.h
@@ -82,12 +82,12 @@ const struct dircache_entry *dircache_get_entry_ptr(const char *filename);
 void dircache_copy_path(const struct dircache_entry *entry, char *buf, int size);
 
 void dircache_bind(int fd, const char *path);
-void dircache_update_filesize(int fd, long newsize);
+void dircache_update_filesize(int fd, long newsize, long startcluster);
 void dircache_mkdir(const char *path);
 void dircache_rmdir(const char *path);
 void dircache_remove(const char *name);
 void dircache_rename(const char *oldpath, const char *newpath);
-void dircache_add_file(const char *path);
+void dircache_add_file(const char *path, long startcluster);
 
 DIRCACHED* opendir_cached(const char* name);
 struct dircache_entry* readdir_cached(DIRCACHED* dir);
-- 
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