From: Thomas Huth <304636@bugs.launchpad.net>
To: qemu-devel@nongnu.org
Subject: [Bug 304636] Re: -hda FAT:. limited to 504MBytes
Date: Tue, 09 Feb 2021 14:10:50 -0000 [thread overview]
Message-ID: <161287985051.32649.84804766016914672.malone@gac.canonical.com> (raw)
In-Reply-To: 20081203025459.23099.79789.malonedeb@gangotri.canonical.com
Pedro,
please also note that vvfat driver is general in a bad state and more or less completely unmaintaind. I can only strongly recommend to *not* use it in production. If you have to share files between guest and host, please use something more modern like virtio-fs (or maybe virtio-9p) instead.
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https://bugs.launchpad.net/bugs/304636
Title:
-hda FAT:. limited to 504MBytes
Status in QEMU:
Confirmed
Status in qemu package in Ubuntu:
Won't Fix
Bug description:
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
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next prev parent reply other threads:[~2021-02-09 14:26 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20081203025459.23099.79789.malonedeb@gangotri.canonical.com>
2021-02-07 0:33 ` [Bug 304636] Re: -hda FAT:. limited to 504MBytes Pedro Pablo Lopez Rodriguez
2021-02-08 22:20 ` Bryce Harrington
2021-02-09 14:10 ` Thomas Huth [this message]
2021-02-09 14:29 ` Daniel Berrange
2021-04-20 16:00 ` Thomas Huth
2021-05-01 8:25 ` Thomas Huth
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