1 files changed, 50 insertions, 14 deletions

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 81747acca4c4..dfd3e6c52a1e 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -971,6 +971,40 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
         return rc;
 }
 
+/*
+ * Set the timeout on write requests past EOF. For some servers (Windows)
+ * these calls can be very long.
+ *
+ * If we're writing >10M past the EOF we give a 180s timeout. Anything less
+ * than that gets a 45s timeout. Writes not past EOF get 15s timeouts.
+ * The 10M cutoff is totally arbitrary. A better scheme for this would be
+ * welcome if someone wants to suggest one.
+ *
+ * We may be able to do a better job with this if there were some way to
+ * declare that a file should be sparse.
+ */
+static int
+cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset)
+{
+        if (offset <= cifsi->server_eof)
+                return CIFS_STD_OP;
+        else if (offset > (cifsi->server_eof + (10 * 1024 * 1024)))
+                return CIFS_VLONG_OP;
+        else
+                return CIFS_LONG_OP;
+}
+
+/* update the file size (if needed) after a write */
+static void
+cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset,
+                      unsigned int bytes_written)
+{
+        loff_t end_of_write = offset + bytes_written;
+
+        if (end_of_write > cifsi->server_eof)
+                cifsi->server_eof = end_of_write;
+}
+
 ssize_t cifs_user_write(struct file *file, const char __user *write_data,
         size_t write_size, loff_t *poffset)
 {
@@ -981,6 +1015,7 @@ ssize_t cifs_user_write(struct file *file, const char __user *write_data,
         struct cifsTconInfo *pTcon;
         int xid, long_op;
         struct cifsFileInfo *open_file;
+        struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode);
 
         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 
@@ -1000,11 +1035,7 @@ ssize_t cifs_user_write(struct file *file, const char __user *write_data,
 
         xid = GetXid();
 
-        if (*poffset > file->f_path.dentry->d_inode->i_size)
-                long_op = CIFS_VLONG_OP; /* writes past EOF take long time */
-        else
-                long_op = CIFS_LONG_OP;
-
+        long_op = cifs_write_timeout(cifsi, *poffset);
         for (total_written = 0; write_size > total_written;
              total_written += bytes_written) {
                 rc = -EAGAIN;
@@ -1048,8 +1079,10 @@ ssize_t cifs_user_write(struct file *file, const char __user *write_data,
                                 FreeXid(xid);
                                 return rc;
                         }
-                } else
+                } else {
+                        cifs_update_eof(cifsi, *poffset, bytes_written);
                         *poffset += bytes_written;
+                }
                 long_op = CIFS_STD_OP; /* subsequent writes fast -
                                     15 seconds is plenty */
         }
@@ -1085,6 +1118,7 @@ static ssize_t cifs_write(struct file *file, const char *write_data,
         struct cifsTconInfo *pTcon;
         int xid, long_op;
         struct cifsFileInfo *open_file;
+        struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode);
 
         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 
@@ -1099,11 +1133,7 @@ static ssize_t cifs_write(struct file *file, const char *write_data,
 
         xid = GetXid();
 
-        if (*poffset > file->f_path.dentry->d_inode->i_size)
-                long_op = CIFS_VLONG_OP; /* writes past EOF can be slow */
-        else
-                long_op = CIFS_LONG_OP;
-
+        long_op = cifs_write_timeout(cifsi, *poffset);
         for (total_written = 0; write_size > total_written;
              total_written += bytes_written) {
                 rc = -EAGAIN;
@@ -1166,8 +1196,10 @@ static ssize_t cifs_write(struct file *file, const char *write_data,
                                 FreeXid(xid);
                                 return rc;
                         }
-                } else
+                } else {
+                        cifs_update_eof(cifsi, *poffset, bytes_written);
                         *poffset += bytes_written;
+                }
                 long_op = CIFS_STD_OP; /* subsequent writes fast -
                                     15 seconds is plenty */
         }
@@ -1380,11 +1412,12 @@ static int cifs_writepages(struct address_space *mapping,
         int nr_pages;
         __u64 offset = 0;
         struct cifsFileInfo *open_file;
+        struct cifsInodeInfo *cifsi = CIFS_I(mapping->host);
         struct page *page;
         struct pagevec pvec;
         int rc = 0;
         int scanned = 0;
-        int xid;
+        int xid, long_op;
 
         cifs_sb = CIFS_SB(mapping->host->i_sb);
 
@@ -1528,12 +1561,15 @@ retry:
                                 cERROR(1, ("No writable handles for inode"));
                                 rc = -EBADF;
                         } else {
+                                long_op = cifs_write_timeout(cifsi, offset);
                                 rc = CIFSSMBWrite2(xid, cifs_sb->tcon,
                                                    open_file->netfid,
                                                    bytes_to_write, offset,
                                                    &bytes_written, iov, n_iov,
-                                                   CIFS_LONG_OP);
+                                                   long_op);
                                 atomic_dec(&open_file->wrtPending);
+                                cifs_update_eof(cifsi, offset, bytes_written);
+
                                 if (rc || bytes_written < bytes_to_write) {
                                         cERROR(1, ("Write2 ret %d, wrote %d",
                                                   rc, bytes_written));