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Subject[PATCH 74/80] staging: lustre: obd: implement md_read_page
Date
From: wang di <di.wang@intel.com>

This patch adds md_read_page which is a new more
flexiable api that will replace md_readpage.

Signed-off-by: wang di <di.wang@intel.com>
Reviewed-on: http://review.whamcloud.com/10761
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4906
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
---
drivers/staging/lustre/lustre/include/obd.h | 13 ++++++++++++-
drivers/staging/lustre/lustre/include/obd_class.h | 15 +++++++++++++++
2 files changed, 27 insertions(+), 1 deletions(-)

diff --git a/drivers/staging/lustre/lustre/include/obd.h b/drivers/staging/lustre/lustre/include/obd.h
index e91f65a..92eebff 100644
--- a/drivers/staging/lustre/lustre/include/obd.h
+++ b/drivers/staging/lustre/lustre/include/obd.h
@@ -830,6 +830,15 @@ struct md_op_data {
struct lustre_handle op_lease_handle;
};

+#define op_stripe_offset op_ioepoch
+#define op_max_pages op_valid
+
+struct md_callback {
+ int (*md_blocking_ast)(struct ldlm_lock *lock,
+ struct ldlm_lock_desc *desc,
+ void *data, int flag);
+};
+
enum op_cli_flags {
CLI_SET_MEA = 1 << 0,
CLI_RM_ENTRY = 1 << 1,
@@ -1039,7 +1048,9 @@ struct md_ops {
struct ptlrpc_request **);
int (*readpage)(struct obd_export *, struct md_op_data *,
struct page **, struct ptlrpc_request **);
-
+ int (*read_page)(struct obd_export *, struct md_op_data *,
+ struct md_callback *cb_op, __u64 hash_offset,
+ struct page **ppage);
int (*unlink)(struct obd_export *, struct md_op_data *,
struct ptlrpc_request **);

diff --git a/drivers/staging/lustre/lustre/include/obd_class.h b/drivers/staging/lustre/lustre/include/obd_class.h
index 69b628b..daca5a0 100644
--- a/drivers/staging/lustre/lustre/include/obd_class.h
+++ b/drivers/staging/lustre/lustre/include/obd_class.h
@@ -1535,6 +1535,21 @@ static inline int md_readpage(struct obd_export *exp, struct md_op_data *opdata,
return rc;
}

+static inline int md_read_page(struct obd_export *exp,
+ struct md_op_data *op_data,
+ struct md_callback *cb_op,
+ __u64 hash_offset,
+ struct page **ppage)
+{
+ int rc;
+
+ EXP_CHECK_MD_OP(exp, read_page);
+ EXP_MD_COUNTER_INCREMENT(exp, read_page);
+ rc = MDP(exp->exp_obd, read_page)(exp, op_data, cb_op, hash_offset,
+ ppage);
+ return rc;
+}
+
static inline int md_unlink(struct obd_export *exp, struct md_op_data *op_data,
struct ptlrpc_request **request)
{
--
1.7.1
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