Changeset 635 for trunk/kernel/fs/fatfs.c

Timestamp:

Jun 26, 2019, 11:42:37 AM (5 years ago)

Author:

alain

Message:

This version is a major evolution: The physical memory allocators,
defined in the kmem.c, ppm.c, and kcm.c files have been modified
to support remote accesses. The RPCs that were previously user
to allocate physical memory in a remote cluster have been removed.
This has been done to cure a dead-lock in case of concurrent page-faults.

This version 2.2 has been tested on a (4 clusters / 2 cores per cluster)
TSAR architecture, for both the "sort" and the "fft" applications.

File:

• trunk/kernel/fs/fatfs.c (modified) (4 diffs)

trunk/kernel/fs/fatfs.c

@@ -1069 +1069 @@
 {
     kmem_req_t    req;
-        req.type    = KMEM_FATFS_CTX;
-        req.size    = sizeof(fatfs_ctx_t);
+        req.type    = KMEM_KCM;
+        req.order   = bits_log2( sizeof(fatfs_ctx_t) );
     req.flags   = AF_KERNEL | AF_ZERO;
 
-        return (fatfs_ctx_t *)kmem_alloc( &req );
+        return kmem_alloc( &req );
 }
 
@@ -1101 +1101 @@
     // - temporarily the BOOT sector
     // - permanently the FS_INFO sector
-        req.type    = KMEM_512_BYTES;
+        req.type    = KMEM_KCM;
+    req.order   = 9;                    // 512 bytes
     req.flags   = AF_KERNEL | AF_ZERO;
-        buffer      = (uint8_t *)kmem_alloc( &req );
-    buffer_xp   = XPTR( local_cxy , buffer );
+        buffer      = kmem_alloc( &req );
 
     if( buffer == NULL ) 
@@ -1112 +1112 @@
     }
      
+    buffer_xp   = XPTR( local_cxy , buffer );
+
     // load the BOOT record from device
     error = dev_ioc_sync_read( buffer_xp , 0 , 1 );
@@ -1242 +1244 @@
 {
     kmem_req_t    req;
-    req.type = KMEM_FATFS_CTX;
+    req.type = KMEM_KCM;
     req.ptr  = fatfs_ctx;
     kmem_free( &req );