quota: send messages via netlink

Implement sending of quota messages via netlink interface.  The advantage
is that in userspace we can better decide what to do with the message - for
example display a dialogue in your X session or just write the message to
the console.  As a bonus, we can get rid of problems with console locking
deep inside filesystem code once we remove the old printing mechanism.

Signed-off-by: Jan Kara <jack@suse.cz>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/fs/Kconfig b/fs/Kconfig
index f0df9a2e19e1..dc06033f8502 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -534,6 +534,24 @@ config QUOTA
           with the quota tools. Probably the quota support is only useful for
           multi user systems. If unsure, say N.
 
+config QUOTA_NETLINK_INTERFACE
+        bool "Report quota messages through netlink interface"
+        depends on QUOTA && NET
+        help
+          If you say Y here, quota warnings (about exceeding softlimit, reaching
+          hardlimit, etc.) will be reported through netlink interface. If unsure,
+          say Y.
+
+config PRINT_QUOTA_WARNING
+        bool "Print quota warnings to console (OBSOLETE)"
+        depends on QUOTA
+        default y
+        help
+          If you say Y here, quota warnings (about exceeding softlimit, reaching
+          hardlimit, etc.) will be printed to the process' controlling terminal.
+          Note that this behavior is currently deprecated and may go away in
+          future. Please use notification via netlink socket instead.
+
 config QFMT_V1
         tristate "Old quota format support"
         depends on QUOTA