fuse: degrade logging of write failure to fuse device

Problem:

FUSE uses failures of communicating with /dev/fuse with various
errnos to indicate in-kernel conditions to userspace. Some of these
shouldn't be handled as an application error. Also the standard
POSIX errno description should not be shown as they are misleading
in this context.

Solution:

When writing to the fuse device, the caller of the respective
convenience routine can mask those errnos which don't qualify to
be an error for the application in that context, so then those
shall be reported at DEBUG level.

The possible non-standard errnos are reported with their
POSIX name instead of their description to avoid confusion.
(Eg. for ENOENT we don't log "no such file or directory",
we log indeed literal "ENOENT".)

Change-Id: I510158843e4b1d482bdc496c2e97b1860dc1ba93
>updates: bz#1193929
updates: #1000
Signed-off-by: Csaba Henk <csaba@redhat.com>
(cherry picked from commit 1166df1920dd9b2bd5fce53ab49d27117db40238)

0 files changed, 0 insertions, 0 deletions