[Bug 304636] [NEW] -hda FAT:. limited to 504MBytes

[mungewell]

Public bug reported:

Binary package hint: qemu

The size of the virtual FAT file system (for sharing a particular directory with Guest OS) is hard-coded to be limited to 504MBytes, in block-vvfat.c
--
/* 504MB disk*/
bs->cyls=1024; bs->heads=16; bs->secs=63;
--

If the directory contents exceeds this is stops with an assert
--
qemu: block-vvfat.c:97: array_get: Assertion `index < array->next' failed.
Aborted
--

Also the FAT16 mode (default) only uses 8KByte cluster sizes which prevents the above being increased. 16KByte and 32KByte sectors can be selected with the following patch
--
--- block-vvfat.c_orig  2008-12-02 12:37:28.000000000 -0700
+++ block-vvfat.c       2008-12-02 19:50:35.000000000 -0700
@@ -1042,6 +1042,12 @@
        s->fat_type = 32;
     } else if (strstr(dirname, ":16:")) {
        s->fat_type = 16;
+    } else if (strstr(dirname, ":16-16K:")) {
+       s->fat_type = 16;
+       s->sectors_per_cluster=0x20;
+    } else if (strstr(dirname, ":16-32K:")) {
+       s->fat_type = 16;
+       s->sectors_per_cluster=0x40;
     } else if (strstr(dirname, ":12:")) {
        s->fat_type = 12;
        s->sector_count=2880;
--

Cheers,
Mungewell

** Affects: qemu (Ubuntu)
     Importance: Undecided
         Status: New

-- 
-hda FAT:. limited to 504MBytes
https://bugs.launchpad.net/bugs/304636
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