[LU-2441] Temporary file support

Wed, 15 Feb 2017 06:56:02 +0000

Having a generic mechanism to create temporary files (~ open/unlinked files) would be useful not only for HSM (restore is done in a separate file), but also for some applications which may want to create such a file w/o modifying the time attributes of the parent directory.

A temporary file has the following properties:

it inherits the striping configuration of the parent directory
it does not change the time attributes of the parent directory
no direntry is inserted in the parent directory
the file is directly linked to PENDING and is thus considered as a open-unlinked file
if the file needs to be opened multiple times (in addition to the creator), this should be done via open_by_fid.

A temporary file could be created via a regular open/creat call with a special - maybe binary - name to prevent conflict with legacy files. For DNE support, there is a requirement to be able to specify in the filename the MDT index where to create the file.

Assigning the bug to Jodi since i can't assign it to Jacques-Charles.

Whamcloud Community JIRA

[LU-2441] Temporary file support