NFS: clean up the unstable write code
Trond Myklebust [Fri, 20 Apr 2007 20:12:34 +0000 (16:12 -0400)]
Get rid of the inlined #ifdefs.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/nfs/write.c
include/linux/nfs_page.h

index ad2e91b..3ed4feb 100644 (file)
@@ -460,6 +460,43 @@ nfs_mark_request_commit(struct nfs_page *req)
        inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
        __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
 }
+
+static inline
+int nfs_write_need_commit(struct nfs_write_data *data)
+{
+       return data->verf.committed != NFS_FILE_SYNC;
+}
+
+static inline
+int nfs_reschedule_unstable_write(struct nfs_page *req)
+{
+       if (test_and_clear_bit(PG_NEED_COMMIT, &req->wb_flags)) {
+               nfs_mark_request_commit(req);
+               return 1;
+       }
+       if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) {
+               nfs_redirty_request(req);
+               return 1;
+       }
+       return 0;
+}
+#else
+static inline void
+nfs_mark_request_commit(struct nfs_page *req)
+{
+}
+
+static inline
+int nfs_write_need_commit(struct nfs_write_data *data)
+{
+       return 0;
+}
+
+static inline
+int nfs_reschedule_unstable_write(struct nfs_page *req)
+{
+       return 0;
+}
 #endif
 
 /*
@@ -746,26 +783,12 @@ int nfs_updatepage(struct file *file, struct page *page,
 
 static void nfs_writepage_release(struct nfs_page *req)
 {
-       nfs_end_page_writeback(req->wb_page);
 
-#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
-       if (!PageError(req->wb_page)) {
-               if (NFS_NEED_RESCHED(req)) {
-                       nfs_redirty_request(req);
-                       goto out;
-               } else if (NFS_NEED_COMMIT(req)) {
-                       nfs_mark_request_commit(req);
-                       goto out;
-               }
-       }
-       nfs_inode_remove_request(req);
-
-out:
-       nfs_clear_commit(req);
-       nfs_clear_reschedule(req);
-#else
-       nfs_inode_remove_request(req);
-#endif
+       if (PageError(req->wb_page) || !nfs_reschedule_unstable_write(req)) {
+               nfs_end_page_writeback(req->wb_page);
+               nfs_inode_remove_request(req);
+       } else
+               nfs_end_page_writeback(req->wb_page);
        nfs_clear_page_writeback(req);
 }
 
@@ -1008,22 +1031,28 @@ static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata)
                nfs_set_pageerror(page);
                req->wb_context->error = task->tk_status;
                dprintk(", error = %d\n", task->tk_status);
-       } else {
-#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
-               if (data->verf.committed < NFS_FILE_SYNC) {
-                       if (!NFS_NEED_COMMIT(req)) {
-                               nfs_defer_commit(req);
-                               memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf));
-                               dprintk(" defer commit\n");
-                       } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) {
-                               nfs_defer_reschedule(req);
-                               dprintk(" server reboot detected\n");
-                       }
-               } else
-#endif
-                       dprintk(" OK\n");
+               goto out;
        }
 
+       if (nfs_write_need_commit(data)) {
+               spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock;
+
+               spin_lock(req_lock);
+               if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) {
+                       /* Do nothing we need to resend the writes */
+               } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) {
+                       memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf));
+                       dprintk(" defer commit\n");
+               } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) {
+                       set_bit(PG_NEED_RESCHED, &req->wb_flags);
+                       clear_bit(PG_NEED_COMMIT, &req->wb_flags);
+                       dprintk(" server reboot detected\n");
+               }
+               spin_unlock(req_lock);
+       } else
+               dprintk(" OK\n");
+
+out:
        if (atomic_dec_and_test(&req->wb_complete))
                nfs_writepage_release(req);
 }
@@ -1064,25 +1093,21 @@ static void nfs_writeback_done_full(struct rpc_task *task, void *calldata)
                if (task->tk_status < 0) {
                        nfs_set_pageerror(page);
                        req->wb_context->error = task->tk_status;
-                       nfs_end_page_writeback(page);
-                       nfs_inode_remove_request(req);
                        dprintk(", error = %d\n", task->tk_status);
-                       goto next;
+                       goto remove_request;
                }
-               nfs_end_page_writeback(page);
 
-#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
-               if (data->args.stable != NFS_UNSTABLE || data->verf.committed == NFS_FILE_SYNC) {
-                       nfs_inode_remove_request(req);
-                       dprintk(" OK\n");
+               if (nfs_write_need_commit(data)) {
+                       memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf));
+                       nfs_mark_request_commit(req);
+                       nfs_end_page_writeback(page);
+                       dprintk(" marked for commit\n");
                        goto next;
                }
-               memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf));
-               nfs_mark_request_commit(req);
-               dprintk(" marked for commit\n");
-#else
+               dprintk(" OK\n");
+remove_request:
+               nfs_end_page_writeback(page);
                nfs_inode_remove_request(req);
-#endif
        next:
                nfs_clear_page_writeback(req);
        }
index d111be6..16b0266 100644 (file)
@@ -49,8 +49,6 @@ struct nfs_page {
 };
 
 #define NFS_WBACK_BUSY(req)    (test_bit(PG_BUSY,&(req)->wb_flags))
-#define NFS_NEED_COMMIT(req)   (test_bit(PG_NEED_COMMIT,&(req)->wb_flags))
-#define NFS_NEED_RESCHED(req)  (test_bit(PG_NEED_RESCHED,&(req)->wb_flags))
 
 extern struct nfs_page *nfs_create_request(struct nfs_open_context *ctx,
                                            struct inode *inode,
@@ -121,34 +119,6 @@ nfs_list_remove_request(struct nfs_page *req)
        req->wb_list_head = NULL;
 }
 
-static inline int
-nfs_defer_commit(struct nfs_page *req)
-{
-       return !test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags);
-}
-
-static inline void
-nfs_clear_commit(struct nfs_page *req)
-{
-       smp_mb__before_clear_bit();
-       clear_bit(PG_NEED_COMMIT, &req->wb_flags);
-       smp_mb__after_clear_bit();
-}
-
-static inline int
-nfs_defer_reschedule(struct nfs_page *req)
-{
-       return !test_and_set_bit(PG_NEED_RESCHED, &req->wb_flags);
-}
-
-static inline void
-nfs_clear_reschedule(struct nfs_page *req)
-{
-       smp_mb__before_clear_bit();
-       clear_bit(PG_NEED_RESCHED, &req->wb_flags);
-       smp_mb__after_clear_bit();
-}
-
 static inline struct nfs_page *
 nfs_list_entry(struct list_head *head)
 {