1 files changed, 29 insertions, 7 deletions

diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index 4d6d7657fb75..3fd28bbafc87 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -205,19 +205,38 @@ static ssize_t
 v9fs_file_write(struct file *filp, const char __user * data,
                 size_t count, loff_t * offset)
 {
-        int ret;
+        int n, rsize, total = 0;
         struct p9_fid *fid;
+        struct p9_client *clnt;
         struct inode *inode = filp->f_path.dentry->d_inode;
+        int origin = *offset;
 
         P9_DPRINTK(P9_DEBUG_VFS, "data %p count %d offset %x\n", data,
                 (int)count, (int)*offset);
 
         fid = filp->private_data;
-        ret = p9_client_write(fid, NULL, data, *offset, count);
-        if (ret > 0) {
-                invalidate_inode_pages2_range(inode->i_mapping, *offset,
-                                                                *offset+ret);
-                *offset += ret;
+        clnt = fid->clnt;
+
+        rsize = fid->iounit;
+        if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
+                rsize = clnt->msize - P9_IOHDRSZ;
+
+        do {
+                if (count < rsize)
+                        rsize = count;
+
+                n = p9_client_write(fid, NULL, data+total, *offset+total,
+                                                                        rsize);
+                if (n <= 0)
+                        break;
+                count -= n;
+                total += n;
+        } while (count > 0);
+
+        if (total > 0) {
+                invalidate_inode_pages2_range(inode->i_mapping, origin,
+                                                                origin+total);
+                *offset += total;
         }
 
         if (*offset > inode->i_size) {
@@ -225,7 +244,10 @@ v9fs_file_write(struct file *filp, const char __user * data,
                 inode->i_blocks = (inode->i_size + 512 - 1) >> 9;
         }
 
-        return ret;
+        if (n < 0)
+                return n;
+
+        return total;
 }
 
 static const struct file_operations v9fs_cached_file_operations = {