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authorDave Jones <davej@redhat.com>2006-12-12 17:41:41 -0500
committerDave Jones <davej@redhat.com>2006-12-12 17:41:41 -0500
commitc4366889dda8110247be59ca41fddb82951a8c26 (patch)
tree705c1a996bed8fd48ce94ff33ec9fd00f9b94875 /Documentation/filesystems/udf.txt
parentdb2fb9db5735cc532fd4fc55e94b9a3c3750378e (diff)
parente1036502e5263851259d147771226161e5ccc85a (diff)
Merge ../linus
Conflicts: drivers/cpufreq/cpufreq.c
Diffstat (limited to 'Documentation/filesystems/udf.txt')
-rw-r--r--Documentation/filesystems/udf.txt13
1 files changed, 11 insertions, 2 deletions
diff --git a/Documentation/filesystems/udf.txt b/Documentation/filesystems/udf.txt
index 511b4230c05..fde829a756e 100644
--- a/Documentation/filesystems/udf.txt
+++ b/Documentation/filesystems/udf.txt
@@ -7,8 +7,17 @@ If you encounter problems with reading UDF discs using this driver,
please report them to linux_udf@hpesjro.fc.hp.com, which is the
developer's list.
-Write support requires a block driver which supports writing. The current
-scsi and ide cdrom drivers do not support writing.
+Write support requires a block driver which supports writing. Currently
+dvd+rw drives and media support true random sector writes, and so a udf
+filesystem on such devices can be directly mounted read/write. CD-RW
+media however, does not support this. Instead the media can be formatted
+for packet mode using the utility cdrwtool, then the pktcdvd driver can
+be bound to the underlying cd device to provide the required buffering
+and read-modify-write cycles to allow the filesystem random sector writes
+while providing the hardware with only full packet writes. While not
+required for dvd+rw media, use of the pktcdvd driver often enhances
+performance due to very poor read-modify-write support supplied internally
+by drive firmware.
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The following mount options are supported: