yaffs: Cache object xattrib state.

[yaffs2.git] / yaffs_guts.c

diff --git a/yaffs_guts.c b/yaffs_guts.c
index 75eeb84cf3d5d23459d9897fa2b1fbc9e5b9c88c..6ea5698b5052dd375e15bceba736a183209587cc 100644 (file)
--- a/yaffs_guts.c
+++ b/yaffs_guts.c
@@ -66,7 +66,7 @@ static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
                                        yaffs_ObjectType type);
 
 
-static int yaffs_ApplyXMod(yaffs_Device *dev, char *buffer, yaffs_XAttrMod *xmod);
+static int yaffs_ApplyXMod(yaffs_Object *obj, char *buffer, yaffs_XAttrMod *xmod);
 
 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
 static int yaffs_CheckStructures(void);
@@ -3112,7 +3112,7 @@ int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
 
                /* process any xattrib modifications */
                if(xmod)
-                       yaffs_ApplyXMod(dev, (char *)buffer, xmod);
+                       yaffs_ApplyXMod(in, (char *)buffer, xmod);
 
 
                /* Tags */
@@ -4939,10 +4939,11 @@ static int yaffs_DoXMod(yaffs_Object *obj, int set, const YCHAR *name, const voi
                return -ENOSPC;
 }
 
-static int yaffs_ApplyXMod(yaffs_Device *dev, char *buffer, yaffs_XAttrMod *xmod)
+static int yaffs_ApplyXMod(yaffs_Object *obj, char *buffer, yaffs_XAttrMod *xmod)
 {
        int retval = 0;
        int x_offs = sizeof(yaffs_ObjectHeader);
+       yaffs_Device *dev = obj->myDev;
        int x_size = dev->nDataBytesPerChunk - sizeof(yaffs_ObjectHeader);
 
        char * x_buffer = buffer + x_offs;
@@ -4952,6 +4953,9 @@ static int yaffs_ApplyXMod(yaffs_Device *dev, char *buffer, yaffs_XAttrMod *xmod
        else
                retval = nval_del(x_buffer, x_size, xmod->name);
 
+       obj->hasXattr = nval_hasvalues(x_buffer, x_size);
+       obj->xattrKnown = 1;
+
        xmod->result = retval;
 
        return retval;
@@ -4973,6 +4977,16 @@ static int yaffs_DoXFetch(yaffs_Object *obj, const YCHAR *name, void *value, int
        if(obj->hdrChunk < 1)
                return -ENODATA;
 
+       /* If we know that the object has no xattribs then don't do all the
+        * reading and parsing.
+        */
+       if(obj->xattrKnown && !obj->hasXattr){
+               if(name)
+                       return -ENODATA;
+               else
+                       return 0;
+       }
+
        buffer = yaffs_GetTempBuffer(dev, __LINE__);
        if(!buffer)
                return -ENOMEM;
@@ -4984,6 +4998,11 @@ static int yaffs_DoXFetch(yaffs_Object *obj, const YCHAR *name, void *value, int
        else{
                x_buffer =  buffer + x_offs;
 
+               if (!obj->xattrKnown){
+                       obj->hasXattr = nval_hasvalues(x_buffer, x_size);
+                       obj->xattrKnown = 1;
+               }
+
                if(name)
                        retval = nval_get(x_buffer, x_size, name, value, size);
                else