Changeset 375ab5e in mainline for uspace/srv/fs/fat/fat_fat.h

Timestamp:

2011-08-24T20:10:43Z (13 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

eb660787

Parents:

7fadb65 (diff), 842a2d2 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

Merge from lp:~romanenko-oleg/helenos/fat.

File:

• uspace/srv/fs/fat/fat_fat.h (modified) (6 diffs)

uspace/srv/fs/fat/fat_fat.h

@@ -1 +1 @@
 /*
  * Copyright (c) 2008 Jakub Jermar
+ * Copyright (c) 2011 Oleg Romanenko
  * All rights reserved.
  *
@@ -29 +30 @@
 /** @addtogroup fs
  * @{
- */ 
+ */
 
 #ifndef FAT_FAT_FAT_H_
@@ -40 +41 @@
 #define FAT1            0
 
-#define FAT_CLST_RES0   0x0000
-#define FAT_CLST_RES1   0x0001
-#define FAT_CLST_FIRST  0x0002
-#define FAT_CLST_BAD    0xfff7
-#define FAT_CLST_LAST1  0xfff8
-#define FAT_CLST_LAST8  0xffff
+#define FAT_CLST_RES0     0
+#define FAT_CLST_RES1     1
+#define FAT_CLST_FIRST    2
+
+#define FAT32_CLST_BAD    0x0ffffff7
+#define FAT32_CLST_LAST1  0x0ffffff8
+#define FAT32_CLST_LAST8  0x0fffffff
+
+#define FAT12_MASK        0x0fff
+#define FAT16_MASK        0xffff
+#define FAT32_MASK        0x0fffffff
+
+#define FAT12_CLST_MAX    4085
+#define FAT16_CLST_MAX    65525
+
+/* Size in bytes for cluster value of FAT */
+#define FAT12_CLST_SIZE   2
+#define FAT16_CLST_SIZE   2
+#define FAT32_CLST_SIZE   4
 
 /* internally used to mark root directory's parent */
@@ -52 +66 @@
 #define FAT_CLST_ROOT           FAT_CLST_RES1
 
+/*
+ * Convenience macros for computing some frequently used values from the
+ * primitive boot sector members.
+ */
+#define RDS(bs)   ((sizeof(fat_dentry_t) * RDE((bs))) / BPS((bs))) + \
+                   (((sizeof(fat_dentry_t) * RDE((bs))) % BPS((bs))) != 0)
+#define SSA(bs)   (RSCNT((bs)) + FATCNT((bs)) * SF((bs)) + RDS(bs))
+#define DS(bs)    (TS(bs) - SSA(bs))
+#define CC(bs)    (DS(bs) / SPC(bs))
+
+#define FAT_IS_FAT12(bs)        (CC(bs) < FAT12_CLST_MAX)
+#define FAT_IS_FAT16(bs) \
+    ((CC(bs) >= FAT12_CLST_MAX) && (CC(bs) < FAT16_CLST_MAX))
+#define FAT_IS_FAT32(bs)        (CC(bs) >= FAT16_CLST_MAX)
+
+#define FAT_CLST_SIZE(bs) \
+    (FAT_IS_FAT32(bs) ? FAT32_CLST_SIZE : FAT16_CLST_SIZE)
+
+#define FAT_MASK(bs) \
+    (FAT_IS_FAT12(bs) ? FAT12_MASK : \
+    (FAT_IS_FAT32(bs) ? FAT32_MASK : FAT16_MASK))
+
+#define FAT_CLST_LAST1(bs)      (FAT32_CLST_LAST1 & FAT_MASK((bs)))
+#define FAT_CLST_LAST8(bs)      (FAT32_CLST_LAST8 & FAT_MASK((bs)))
+#define FAT_CLST_BAD(bs)        (FAT32_CLST_BAD & FAT_MASK((bs)))
+
+#define FAT_ROOT_CLST(bs) \
+    (FAT_IS_FAT32(bs) ? uint32_t_le2host(bs->fat32.root_cluster) : \
+    FAT_CLST_ROOT)
+
 /* forward declarations */
 struct block;
@@ -57 +101 @@
 struct fat_bs;
 
-typedef uint16_t fat_cluster_t;
+typedef uint32_t fat_cluster_t;
 
-#define fat_clusters_get(numc, bs, dh, fc) \
-    fat_cluster_walk((bs), (dh), (fc), NULL, (numc), (uint16_t) -1)
+#define fat_clusters_get(numc, bs, sid, fc) \
+    fat_cluster_walk((bs), (sid), (fc), NULL, (numc), (uint32_t) -1)
 extern int fat_cluster_walk(struct fat_bs *, service_id_t, fat_cluster_t,
-    fat_cluster_t *, uint16_t *, uint16_t);
+    fat_cluster_t *, uint32_t *, uint32_t);
 
 extern int fat_block_get(block_t **, struct fat_bs *, struct fat_node *,
@@ -78 +122 @@
 extern int fat_alloc_shadow_clusters(struct fat_bs *, service_id_t,
     fat_cluster_t *, unsigned);
+extern int fat_get_cluster_fat12(struct fat_bs *, service_id_t, unsigned,
+    fat_cluster_t, fat_cluster_t *);
+extern int fat_get_cluster_fat16(struct fat_bs *, service_id_t, unsigned,
+    fat_cluster_t, fat_cluster_t *);
+extern int fat_get_cluster_fat32(struct fat_bs *, service_id_t, unsigned,
+    fat_cluster_t, fat_cluster_t *);
 extern int fat_get_cluster(struct fat_bs *, service_id_t, unsigned,
     fat_cluster_t, fat_cluster_t *);
+extern int fat_set_cluster_fat12(struct fat_bs *, service_id_t, unsigned,
+    fat_cluster_t, fat_cluster_t);
+extern int fat_set_cluster_fat16(struct fat_bs *, service_id_t, unsigned,
+    fat_cluster_t, fat_cluster_t);
+extern int fat_set_cluster_fat32(struct fat_bs *, service_id_t, unsigned,
+    fat_cluster_t, fat_cluster_t);
 extern int fat_set_cluster(struct fat_bs *, service_id_t, unsigned,
     fat_cluster_t, fat_cluster_t);