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udf: Update mount option documentation 

Update documentation of uid and gid mount options.

Reviewed-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2018-02-22 10:52:34 +01:00
parent 116e5258e4
commit 6ccd5194a0
1 changed files with 7 additions and 11 deletions
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18
Documentation/filesystems/udf.txt
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@ -36,18 +36,14 @@ The following mount options are supported:
iocharset= Set the NLS character set
The uid= and gid= options need a bit more explaining. They will accept a
decimal numeric value which will be used as the default ID for that mount.
They will also accept the string "ignore" and "forget". For files on the disk
that are owned by nobody ( -1 ), they will instead look as if they are owned
by the default ID. The ignore option causes the default ID to override all
IDs on the disk, not just -1. The forget option causes all IDs to be written
to disk as -1, so when the media is later remounted, they will appear to be
owned by whatever default ID it is mounted with at that time.
decimal numeric value and all inodes on that mount will then appear as
belonging to that uid and gid. Mount options also accept the string "forget".
The forget option causes all IDs to be written to disk as -1 which is a way
of UDF standard to indicate that IDs are not supported for these files .
For typical desktop use of removable media, you should set the ID to that
of the interactively logged on user, and also specify both the forget and
ignore options. This way the interactive user will always see the files
on the disk as belonging to him.
For typical desktop use of removable media, you should set the ID to that of
the interactively logged on user, and also specify the forget option. This way
the interactive user will always see the files on the disk as belonging to him.
The remaining are for debugging and disaster recovery: