Changeset 76292 in vbox for trunk/include/iprt

Timestamp:

Dec 19, 2018 1:49:08 PM (6 years ago)

Author:

vboxsync

Message:

Runtime/fs/extvfs: Working on parsing block group and inode descriptors

File:

• trunk/include/iprt/formats/ext.h (modified) (7 diffs)

trunk/include/iprt/formats/ext.h

@@ -41 +41 @@
  * https://www.kernel.org/doc/html/latest/filesystems/ext4/index.html
  */
+
+/** Offset where to find the first superblock on the disk, this is constant. */
+#define EXT_SB_OFFSET               1024
 
 /** @name EXT_INODE_NR_XXX - Special inode numbers.
@@ -136 +139 @@
     uint8_t     cBlocksPrealloc;
     /** 0xcd: Number of blocks to try to preallocate for directories. */
-    uint8_t     cBlocksPreallocDirextory;
+    uint8_t     cBlocksPreallocDirectory;
     /** 0xce: Number of reserved group descriptor entries for future filesystem expansion. */
     uint16_t    cGdtEntriesRsvd;
@@ -505 +508 @@
 /** Pointer to an ext block group descriptor. */
 typedef EXTBLOCKGROUPDESC32 *PEXTBLOCKGROUPDESC32;
+/** Pointer to a const 32 byte block group descriptor. */
+typedef const EXTBLOCKGROUPDESC32 *PCEXTBLOCKGROUPDESC32;
+
 
 /**
@@ -539 +545 @@
 /** Pointer to an ext block group descriptor. */
 typedef EXTBLOCKGROUPDESC64 *PEXTBLOCKGROUPDESC64;
+/** Pointer to a const 64 byte block group descriptor. */
+typedef const EXTBLOCKGROUPDESC64 *PCEXTBLOCKGROUPDESC64;
 
 /** @name EXT_GROUP_DESC_F_XXX - Group descriptor flags
@@ -549 +557 @@
 #define EXT_GROUP_DESC_F_INODE_ZEROED                RT_BIT_16(2)
 /** @} */
+
+
+/**
+ * Combiend view of the different block gorup descriptor versions.
+ */
+typedef union EXTBLOCKGROUPDESC
+{
+    /** 32 byte version. */
+    EXTBLOCKGROUPDESC32    v32;
+    /** 64 byte version. */
+    EXTBLOCKGROUPDESC64    v64;
+    /** Byte view. */
+    uint8_t               au8[64];
+} EXTBLOCKGROUPDESC;
+/** Poiner to a unified block gorup descriptor view. */
+typedef EXTBLOCKGROUPDESC *PEXTBLOCKGROUPDESC;
+/** Poiner to a const unified block gorup descriptor view. */
+typedef const EXTBLOCKGROUPDESC *PCEXTBLOCKGROUPDESC;
 
 
@@ -621 +647 @@
 typedef const EXTINODE *PCEXTINODE;
 
+
 /**
  * Extra inode data (coming right behind the fixed inode data).
@@ -649 +676 @@
 /** Pointer to a const extra inode data. */
 typedef const EXTINODEEXTRA *PCEXTINODEEXTRA;
+
+
+/**
+ * Combined inode data.
+ */
+typedef struct EXTINODECOMB
+{
+    /** Core inode structure. */
+    EXTINODE      Core;
+    /** Any extra inode data which might be present. */
+    EXTINODEEXTRA Extra;
+} EXTINODECOMB;
+/** Pointer to combined inode data. */
+typedef EXTINODECOMB *PEXTINODECOMB;
+/** Pointer to a const combined inode data. */
+typedef const EXTINODECOMB *PCEXTINODECOMB;
+
+
 
 /** @name EXT_INODE_MODE_XXX - File mode