Changeset 1776895 in mainline for uspace/srv/fs/exfat/exfat_fat.c

Timestamp:

2011-12-11T15:03:59Z (12 years ago)

Author:

Maurizio Lombardi <m.lombardi85@…>

Branches:

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

Children:

80ec9b8

Parents:

92d9406

Message:

exfat: Add filesystem sanity check.

File:

• uspace/srv/fs/exfat/exfat_fat.c (modified) (2 diffs)

uspace/srv/fs/exfat/exfat_fat.c

@@ -50 +50 @@
 #include <malloc.h>
 #include <mem.h>
+#include <str.h>
 
 
@@ -541 +542 @@
 int exfat_sanity_check(exfat_bs_t *bs, service_id_t service_id)
 {
-        /* TODO */
+        if (str_cmp((char const *)bs->oem_name, "EXFAT   "))
+                return ENOTSUP;
+        else if (uint16_t_le2host(bs->signature) != 0xAA55)
+                return ENOTSUP;
+        else if (uint32_t_le2host(bs->fat_sector_count) == 0)
+                return ENOTSUP;
+        else if (uint32_t_le2host(bs->data_clusters) == 0)
+                return ENOTSUP;
+        else if (bs->fat_count != 1)
+                return ENOTSUP;
+        else if ((bs->bytes_per_sector + bs->sec_per_cluster) > 25) {
+                /* exFAT does not support cluster size > 32 Mb */
+                return ENOTSUP;
+        }
         return EOK;
 }