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authorJeff Darcy <jdarcy@redhat.com>2014-02-11 00:19:57 +0000
committerJeff Darcy <jdarcy@redhat.com>2014-03-11 17:50:53 +0000
commit6eaa28f976dce3d5dc9d7fbe08a14579bb021ef4 (patch)
tree5e60702b4dd90ae9f021adc95bd6c1323df444b6 /libglusterfs/src/xlator.h
parent93882c439af4badfc2f1b5a9edc99eeb4a7aa93c (diff)
Add GF_FOP_IPC for inter-translator communication.
Several features - e.g. encryption, erasure codes, or NSR - involve multiple cooperating translators which sometimes need a "private" means of communication amongst themselves. Historically we've used virtual or synthetic xattrs, but that's not very elegant and clutters up the getxattr/setxattr path which must also handle real xattr requests. This new fop should address that. The only argument is an int32_t "op" which should be recognized by the target translator. It is recommended that translators using these feature follow some convention regarding the ops that they define, to avoid conflicts. Using a hash of the target translator's type string as a base for a series of ops would probably be a good start. Any other information can be passed in both directions using xdata. The default behavior for this fop, as with any other, is to pass through to FIRST_CHILD. That makes use of this fop "transparent" to other translators that were written before it existed, but it also means that it only really works with pass-through translators. If a routing translator (such as DHT) or a fan-out translator (such as AFR) is involved, the IPC might not reach its intended destination unless those translators are modified to forward IPC fops along all paths. If an IPC gets all the way to storage/posix it is considered an error, much like an uncaught exception. We don't actually *do* anything in that case, but we do flag it as an error in the log. Change-Id: I7f37c9247ee35536f8136c7aea758e6fe04616c4 Signed-off-by: Jeff Darcy <jdarcy@redhat.com>
Diffstat (limited to 'libglusterfs/src/xlator.h')
-rw-r--r--libglusterfs/src/xlator.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/libglusterfs/src/xlator.h b/libglusterfs/src/xlator.h
index 1daa06ec2..ec5c0c5c1 100644
--- a/libglusterfs/src/xlator.h
+++ b/libglusterfs/src/xlator.h
@@ -442,6 +442,10 @@ typedef int32_t (*fop_zerofill_cbk_t) (call_frame_t *frame,
struct iatt *preop_stbuf,
struct iatt *postop_stbuf, dict_t *xdata);
+typedef int32_t (*fop_ipc_cbk_t) (call_frame_t *frame, void *cookie,
+ xlator_t *this, int32_t op_ret,
+ int32_t op_errno, dict_t *xdata);
+
typedef int32_t (*fop_lookup_t) (call_frame_t *frame,
xlator_t *this,
loc_t *loc,
@@ -673,6 +677,7 @@ typedef int32_t (*fop_discard_t) (call_frame_t *frame,
off_t offset,
size_t len,
dict_t *xdata);
+
typedef int32_t (*fop_zerofill_t) (call_frame_t *frame,
xlator_t *this,
fd_t *fd,
@@ -680,6 +685,9 @@ typedef int32_t (*fop_zerofill_t) (call_frame_t *frame,
off_t len,
dict_t *xdata);
+typedef int32_t (*fop_ipc_t) (call_frame_t *frame, xlator_t *this, int32_t op,
+ dict_t *xdata);
+
struct xlator_fops {
fop_lookup_t lookup;
fop_stat_t stat;
@@ -726,6 +734,7 @@ struct xlator_fops {
fop_fallocate_t fallocate;
fop_discard_t discard;
fop_zerofill_t zerofill;
+ fop_ipc_t ipc;
/* these entries are used for a typechecking hack in STACK_WIND _only_ */
fop_lookup_cbk_t lookup_cbk;
@@ -773,6 +782,7 @@ struct xlator_fops {
fop_fallocate_cbk_t fallocate_cbk;
fop_discard_cbk_t discard_cbk;
fop_zerofill_cbk_t zerofill_cbk;
+ fop_ipc_cbk_t ipc_cbk;
};
typedef int32_t (*cbk_forget_t) (xlator_t *this,