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| author | Phillip Susi <psusi@cfl.rr.com> | 2006-11-16 01:19:23 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-11-16 11:43:38 -0800 |
| commit | 55aa601e14cbec987fa577a895e9297df1d0a71d (patch) | |
| tree | ed7012c8a560f39c28974518260039969548588a /Documentation/filesystems | |
| parent | d6ddf55440833fd9404138026af246c51ebeef22 (diff) | |
| download | lwn-55aa601e14cbec987fa577a895e9297df1d0a71d.tar.gz lwn-55aa601e14cbec987fa577a895e9297df1d0a71d.zip | |
[PATCH] Update udf documentation to reflect current state of read/write support
Change Documentation/filesystems/udf.txt from saying that read/write mounts
on cd media are not supported to instead state the current level of
support. Specifically that it works fine on dvd+rw media and can be made
to work on cd-rw media via the pktcdvd device.
Cc: Peter Osterlund <petero2@telia.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/udf.txt | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/Documentation/filesystems/udf.txt b/Documentation/filesystems/udf.txt index 511b4230c053..fde829a756e6 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. ------------------------------------------------------------------------------- The following mount options are supported: |