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Subject[PATCH 18/25] afs: Calc callback expiry in op reply delivery [ver #2]
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Calculate the callback expiration time at the point of operation reply
delivery, using the reply time queried from AF_RXRPC on that call as a
base.

Signed-off-by: David Howells <dhowells@redhat.com>
---

fs/afs/afs.h | 2 +-
fs/afs/fsclient.c | 22 +++++++++++++++++-----
fs/afs/inode.c | 4 ++--
fs/afs/internal.h | 2 ++
fs/afs/rxrpc.c | 6 ++++++
5 files changed, 28 insertions(+), 8 deletions(-)

diff --git a/fs/afs/afs.h b/fs/afs/afs.h
index fb9bcb8758ea..417cd23529c5 100644
--- a/fs/afs/afs.h
+++ b/fs/afs/afs.h
@@ -68,8 +68,8 @@ typedef enum {
} afs_callback_type_t;

struct afs_callback {
+ time64_t expires_at; /* Time at which expires */
unsigned version; /* Callback version */
- unsigned expiry; /* Time at which expires */
afs_callback_type_t type; /* Type of callback */
};

diff --git a/fs/afs/fsclient.c b/fs/afs/fsclient.c
index f758750e81d8..6105cdb17163 100644
--- a/fs/afs/fsclient.c
+++ b/fs/afs/fsclient.c
@@ -287,13 +287,19 @@ static void xdr_decode_AFSCallBack(struct afs_call *call,
*_bp = bp;
}

-static void xdr_decode_AFSCallBack_raw(const __be32 **_bp,
+static ktime_t xdr_decode_expiry(struct afs_call *call, u32 expiry)
+{
+ return ktime_add_ns(call->reply_time, expiry * NSEC_PER_SEC);
+}
+
+static void xdr_decode_AFSCallBack_raw(struct afs_call *call,
+ const __be32 **_bp,
struct afs_callback *cb)
{
const __be32 *bp = *_bp;

cb->version = ntohl(*bp++);
- cb->expiry = ntohl(*bp++);
+ cb->expires_at = xdr_decode_expiry(call, ntohl(*bp++));
cb->type = ntohl(*bp++);
*_bp = bp;
}
@@ -440,6 +446,7 @@ int afs_fs_fetch_file_status(struct afs_fs_cursor *fc, struct afs_volsync *volsy
call->reply[0] = vnode;
call->reply[1] = volsync;
call->expected_version = new_inode ? 1 : vnode->status.data_version;
+ call->want_reply_time = true;

/* marshall the parameters */
bp = call->request;
@@ -627,6 +634,7 @@ static int afs_fs_fetch_data64(struct afs_fs_cursor *fc, struct afs_read *req)
call->reply[1] = NULL; /* volsync */
call->reply[2] = req;
call->expected_version = vnode->status.data_version;
+ call->want_reply_time = true;

/* marshall the parameters */
bp = call->request;
@@ -672,6 +680,7 @@ int afs_fs_fetch_data(struct afs_fs_cursor *fc, struct afs_read *req)
call->reply[1] = NULL; /* volsync */
call->reply[2] = req;
call->expected_version = vnode->status.data_version;
+ call->want_reply_time = true;

/* marshall the parameters */
bp = call->request;
@@ -714,7 +723,7 @@ static int afs_deliver_fs_create_vnode(struct afs_call *call)
&call->expected_version, NULL);
if (ret < 0)
return ret;
- xdr_decode_AFSCallBack_raw(&bp, call->reply[3]);
+ xdr_decode_AFSCallBack_raw(call, &bp, call->reply[3]);
/* xdr_decode_AFSVolSync(&bp, call->reply[X]); */

_leave(" = 0 [done]");
@@ -773,6 +782,7 @@ int afs_fs_create(struct afs_fs_cursor *fc,
call->reply[2] = newstatus;
call->reply[3] = newcb;
call->expected_version = current_data_version + 1;
+ call->want_reply_time = true;

/* marshall the parameters */
bp = call->request;
@@ -2042,7 +2052,7 @@ static int afs_deliver_fs_fetch_status(struct afs_call *call)
&call->expected_version, NULL);
if (ret < 0)
return ret;
- xdr_decode_AFSCallBack_raw(&bp, callback);
+ xdr_decode_AFSCallBack_raw(call, &bp, callback);
if (volsync)
xdr_decode_AFSVolSync(&bp, volsync);

@@ -2088,6 +2098,7 @@ int afs_fs_fetch_status(struct afs_fs_cursor *fc,
call->reply[2] = callback;
call->reply[3] = volsync;
call->expected_version = 1; /* vnode->status.data_version */
+ call->want_reply_time = true;

/* marshall the parameters */
bp = call->request;
@@ -2188,7 +2199,7 @@ static int afs_deliver_fs_inline_bulk_status(struct afs_call *call)
bp = call->buffer;
callbacks = call->reply[2];
callbacks[call->count].version = ntohl(bp[0]);
- callbacks[call->count].expiry = ntohl(bp[1]);
+ callbacks[call->count].expires_at = xdr_decode_expiry(call, ntohl(bp[1]));
callbacks[call->count].type = ntohl(bp[2]);
statuses = call->reply[1];
if (call->count == 0 && vnode && statuses[0].abort_code == 0)
@@ -2261,6 +2272,7 @@ int afs_fs_inline_bulk_status(struct afs_fs_cursor *fc,
call->reply[2] = callbacks;
call->reply[3] = volsync;
call->count2 = nr_fids;
+ call->want_reply_time = true;

/* marshall the parameters */
bp = call->request;
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index 4ba47efe9668..4c6d8e1112c2 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -317,11 +317,11 @@ struct inode *afs_iget(struct super_block *sb, struct key *key,
* didn't give us a callback) */
vnode->cb_version = 0;
vnode->cb_type = 0;
- vnode->cb_expires_at = 0;
+ vnode->cb_expires_at = ktime_get();
} else {
vnode->cb_version = cb->version;
vnode->cb_type = cb->type;
- vnode->cb_expires_at = cb->expiry;
+ vnode->cb_expires_at = cb->expires_at;
vnode->cb_interest = afs_get_cb_interest(cbi);
set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
}
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 28d08aac515d..78065af05153 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -131,6 +131,7 @@ struct afs_call {
bool async; /* T if asynchronous */
bool ret_reply0; /* T if should return reply[0] on success */
bool upgrade; /* T to request service upgrade */
+ bool want_reply_time; /* T if want reply_time */
u16 service_id; /* Actual service ID (after upgrade) */
unsigned int debug_id; /* Trace ID */
u32 operation_ID; /* operation ID for an incoming call */
@@ -144,6 +145,7 @@ struct afs_call {
};
afs_dataversion_t expected_version; /* Updated version expected from store */
afs_dataversion_t expected_version_2; /* 2nd updated version expected from store */
+ ktime_t reply_time; /* Time of first reply packet */
};

struct afs_call_type {
diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c
index ce98e133caa6..444ba0d511ef 100644
--- a/fs/afs/rxrpc.c
+++ b/fs/afs/rxrpc.c
@@ -499,6 +499,12 @@ static void afs_deliver_to_call(struct afs_call *call)
return;
}

+ if (call->want_reply_time &&
+ rxrpc_kernel_get_reply_time(call->net->socket,
+ call->rxcall,
+ &call->reply_time))
+ call->want_reply_time = false;
+
ret = call->type->deliver(call);
state = READ_ONCE(call->state);
switch (ret) {
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