Changeset 92bee46 in mainline for uspace/srv/fs/fat/fat_ops.c

Timestamp:

2010-01-15T20:31:48Z (14 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

48e1467, d45660a

Parents:

61c0402

Message:

Refuse to mount FAT file systems with root directory entries that do not take up
whole blocks.

File:

• uspace/srv/fs/fat/fat_ops.c (modified) (1 diff)

uspace/srv/fs/fat/fat_ops.c

@@ -324 +324 @@
         /* Check number of sectors per FAT. */
         if (bs->sec_per_fat == 0)
+                return ENOTSUP;
+
+        /*
+         * Check that the root directory entries take up whole blocks.
+         * This check is rather strict, but it allows us to treat the root
+         * directory and non-root directories uniformly in some places.
+         * It can be removed provided that functions such as fat_read() are
+         * sanitized to support file systems with this property.
+         */
+        if ((uint16_t_le2host(bs->root_ent_max) * sizeof(fat_dentry_t)) %
+            uint16_t_le2host(bs->bps) != 0)
                 return ENOTSUP;