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| author |   Eric Paris <eparis@redhat.com> | 2010-10-28 17:21:56 -0400 |
|---|---|---|
| committer | Eric Paris <eparis@redhat.com> | 2010-10-28 17:22:13 -0400 |
| commit | 4231a23530a30e86eb32fbe869bbef1b3e54d5aa (patch) | |
| tree | bb268ea2e6cb50e8ea46e1f5a536ae0f0afb4e06 /include/linux/fanotify.h | |
| parent | fsnotify: implement ordering between notifiers (diff) | |
| download | linux-dev-4231a23530a30e86eb32fbe869bbef1b3e54d5aa.tar.xz linux-dev-4231a23530a30e86eb32fbe869bbef1b3e54d5aa.zip | |
fanotify: implement fanotify listener ordering
The fanotify listeners needs to be able to specify what types of operations
they are going to perform so they can be ordered appropriately between other
listeners doing other types of operations. They need this to be able to make
sure that things like hierarchichal storage managers will get access to inodes
before processes which need the data. This patch defines 3 possible uses
which groups must indicate in the fanotify_init() flags.
FAN_CLASS_PRE_CONTENT
FAN_CLASS_CONTENT
FAN_CLASS_NOTIF
Groups will receive notification in that order. The order between 2 groups in
the same class is undeterministic.
FAN_CLASS_PRE_CONTENT is intended to be used by listeners which need access to
the inode before they are certain that the inode contains it's final data. A
hierarchical storage manager should choose to use this class.
FAN_CLASS_CONTENT is intended to be used by listeners which need access to the
inode after it contains its intended contents. This would be the appropriate
level for an AV solution or document control system.
FAN_CLASS_NOTIF is intended for normal async notification about access, much the
same as inotify and dnotify. Syncronous permissions events are not permitted
at this class.
Signed-off-by: Eric Paris <eparis@redhat.com>
Diffstat (limited to 'include/linux/fanotify.h')
| -rw-r--r-- | include/linux/fanotify.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/include/linux/fanotify.h b/include/linux/fanotify.h index 63531a6b4d2a..2c89ce7b644e 100644 --- a/include/linux/fanotify.h +++ b/include/linux/fanotify.h @@ -25,7 +25,16 @@ #define FAN_CLOEXEC 0x00000001 #define FAN_NONBLOCK 0x00000002 -#define FAN_ALL_INIT_FLAGS (FAN_CLOEXEC | FAN_NONBLOCK) +/* These are NOT bitwise flags. Both bits are used togther. */ +#define FAN_CLASS_NOTIF 0x00000000 +#define FAN_CLASS_CONTENT 0x00000004 +#define FAN_CLASS_PRE_CONTENT 0x00000008 + +#define FAN_ALL_CLASS_BITS (FAN_CLASS_NOTIF | FAN_CLASS_CONTENT | \ + FAN_CLASS_PRE_CONTENT) + +#define FAN_ALL_INIT_FLAGS (FAN_CLOEXEC | FAN_NONBLOCK | \ + FAN_ALL_CLASS_BITS) /* flags used for fanotify_modify_mark() */ #define FAN_MARK_ADD 0x00000001 |