NFS: Clean up nfs_flush_list()

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 29 insertions, 33 deletions

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index d9e5ee59457..2beb1268bb1 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -963,7 +963,7 @@ static void nfs_execute_write(struct nfs_write_data *data)
  * Generate multiple small requests to write out a single
  * contiguous dirty area on one page.
  */
-static int nfs_flush_multi(struct list_head *head, struct inode *inode, int how)
+static int nfs_flush_multi(struct inode *inode, struct list_head *head, int how)
 {
         struct nfs_page *req = nfs_list_entry(head->next);
         struct page *page = req->wb_page;
@@ -1032,16 +1032,13 @@ out_bad:
  * This is the case if nfs_updatepage detects a conflicting request
  * that has been written but not committed.
  */
-static int nfs_flush_one(struct list_head *head, struct inode *inode, int how)
+static int nfs_flush_one(struct inode *inode, struct list_head *head, int how)
 {
         struct nfs_page         *req;
         struct page             **pages;
         struct nfs_write_data   *data;
         unsigned int            count;
 
-        if (NFS_SERVER(inode)->wsize < PAGE_CACHE_SIZE)
-                return nfs_flush_multi(head, inode, how);
-
         data = nfs_writedata_alloc(NFS_SERVER(inode)->wpages);
         if (!data)
                 goto out_bad;
@@ -1074,24 +1071,32 @@ static int nfs_flush_one(struct list_head *head, struct inode *inode, int how)
         return -ENOMEM;
 }
 
-static int
-nfs_flush_list(struct list_head *head, int wpages, int how)
+static int nfs_flush_list(struct inode *inode, struct list_head *head, int npages, int how)
 {
         LIST_HEAD(one_request);
-        struct nfs_page         *req;
-        int                     error = 0;
-        unsigned int            pages = 0;
+        int (*flush_one)(struct inode *, struct list_head *, int);
+        struct nfs_page *req;
+        int wpages = NFS_SERVER(inode)->wpages;
+        int wsize = NFS_SERVER(inode)->wsize;
+        int error;
 
-        while (!list_empty(head)) {
-                pages += nfs_coalesce_requests(head, &one_request, wpages);
+        flush_one = nfs_flush_one;
+        if (wsize < PAGE_CACHE_SIZE)
+                flush_one = nfs_flush_multi;
+        /* For single writes, FLUSH_STABLE is more efficient */
+        if (npages <= wpages && npages == NFS_I(inode)->npages
+                        && nfs_list_entry(head->next)->wb_bytes <= wsize)
+                how |= FLUSH_STABLE;
+
+        do {
+                nfs_coalesce_requests(head, &one_request, wpages);
                 req = nfs_list_entry(one_request.next);
-                error = nfs_flush_one(&one_request, req->wb_context->dentry->d_inode, how);
+                error = flush_one(inode, &one_request, how);
                 if (error < 0)
-                        break;
-        }
-        if (error >= 0)
-                return pages;
-
+                        goto out_err;
+        } while (!list_empty(head));
+        return 0;
+out_err:
         while (!list_empty(head)) {
                 req = nfs_list_entry(head->next);
                 nfs_list_remove_request(req);
@@ -1423,24 +1428,16 @@ static int nfs_flush_inode(struct inode *inode, unsigned long idx_start,
 {
         struct nfs_inode *nfsi = NFS_I(inode);
         LIST_HEAD(head);
-        int                     res,
-                                error = 0;
+        int res;
 
         spin_lock(&nfsi->req_lock);
         res = nfs_scan_dirty(inode, &head, idx_start, npages);
         spin_unlock(&nfsi->req_lock);
         if (res) {
-                struct nfs_server *server = NFS_SERVER(inode);
-
-                /* For single writes, FLUSH_STABLE is more efficient */
-                if (res == nfsi->npages && nfsi->npages <= server->wpages) {
-                        if (res > 1 || nfs_list_entry(head.next)->wb_bytes <= server->wsize)
-                                how |= FLUSH_STABLE;
-                }
-                error = nfs_flush_list(&head, server->wpages, how);
+                int error = nfs_flush_list(inode, &head, res, how);
+                if (error < 0)
+                        return error;
         }
-        if (error < 0)
-                return error;
         return res;
 }
 
@@ -1449,14 +1446,13 @@ int nfs_commit_inode(struct inode *inode, int how)
 {
         struct nfs_inode *nfsi = NFS_I(inode);
         LIST_HEAD(head);
-        int                     res,
-                                error = 0;
+        int res;
 
         spin_lock(&nfsi->req_lock);
         res = nfs_scan_commit(inode, &head, 0, 0);
         spin_unlock(&nfsi->req_lock);
         if (res) {
-                error = nfs_commit_list(inode, &head, how);
+                int error = nfs_commit_list(inode, &head, how);
                 if (error < 0)
                         return error;
         }