[systemd-devel] [PATCH V3] Allow systemd-tmpfiles to set file/directory attributes

[Goffredo Baroncelli]

Hi all,
This set of patches add two new line types to the tmpfiles files format.
These new types of line are 'h' and 'H' (the recursively version), and 
allow to change the file/directory attributes, like chattr(1) does.

One of the motivation of these patches is to get rid of the commit
11689d2a which force the NOCOW flag for the journal files. This was 
needed because systemd-journald has very poor performance when the
filesytem is BTRFS due to its the COW behavior. My concern is that 
the NOCOW flag also prevent BTRFS to rebuild a corrupted file from a 
good copy if it is available. 

With this patch, now the NOCOW flag can be set by systemd-tmpfiles.
See [1] for further information.

BR
G.Baroncelli

Changelog:
v1: first issue
v2: accepted several suggestion on the style; added function 
    change_attr_fd(); used the _cleanup_close_; returned
    negative errno;
v3: swapped arguments of change_attr_fd() in path_set_attrib()


[1] Re: [systemd-devel] [RFC][PATCH] Add option to enable COW for journal file
https://www.mail-archive.com/systemd-devel@lists.freedesktop.org/msg28724.html

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