Introduce pread_fast(), a function that can return a pointer to the data in cache

instead of using memcpy to fill the buffer with a copy of the data

1 files changed, 9 insertions, 0 deletions

diff --git a/src/io_redir.c b/src/io_redir.c
index a8f85ca..449a3e8 100644
--- a/src/io_redir.c
+++ b/src/io_redir.c
@@ -55,6 +55,7 @@ struct info_io_redir
   list_redir_t *list_redir;
 };
 
+static void *io_redir_pread_fast(disk_t *disk_car, void *buffer, const unsigned int count, const uint64_t offset);
 static int io_redir_pread(disk_t *disk_car, void *buffer, const unsigned int count, const uint64_t offset);
 static int io_redir_clean(disk_t *clean);
 
@@ -78,6 +79,7 @@ int io_redir_add_redir(disk_t *disk_car, const uint64_t org_offset, const unsign
     disk_car->data=data;
     disk_car->description=old_disk_car->description;
     disk_car->pwrite=old_disk_car->pwrite;
+    disk_car->pread_fast=io_redir_pread_fast;
     disk_car->pread=io_redir_pread;
     disk_car->clean=io_redir_clean;
   }
@@ -217,6 +219,13 @@ static int io_redir_pread(disk_t *disk_car, void *buffer, const unsigned int cou
   return count;
 }
 
+static void *io_redir_pread_fast(disk_t *disk, void *buffer, const unsigned int count, const uint64_t offset)
+{
+  if(io_redir_pread(disk, buffer, count, offset)==count)
+    return buffer;
+  return NULL;
+}
+
 static int io_redir_clean(disk_t *disk_car)
 {
   if(disk_car->data)