get rid of nobh_write_begin_newtrunc

Move the call to vmtruncate to get rid of accessive blocks to the only
remaining caller and rename the non-truncating version to nobh_write_begin.

Get rid of the superflous file argument to it while we're at it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

3 files changed, 16 insertions, 41 deletions

diff --git a/fs/buffer.c b/fs/buffer.c
index d54812b198e9..559daf76bca4 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2510,11 +2510,11 @@ static void attach_nobh_buffers(struct page *page, struct buffer_head *head)
 }
 
 /*
- * Filesystems implementing the new truncate sequence should use the
- * _newtrunc postfix variant which won't incorrectly call vmtruncate.
+ * On entry, the page is fully not uptodate.
+ * On exit the page is fully uptodate in the areas outside (from,to)
  * The filesystem needs to handle block truncation upon failure.
  */
-int nobh_write_begin_newtrunc(struct file *file, struct address_space *mapping,
+int nobh_write_begin(struct address_space *mapping,
                         loff_t pos, unsigned len, unsigned flags,
                         struct page **pagep, void **fsdata,
                         get_block_t *get_block)
@@ -2547,7 +2547,7 @@ int nobh_write_begin_newtrunc(struct file *file, struct address_space *mapping,
                 unlock_page(page);
                 page_cache_release(page);
                 *pagep = NULL;
-                return block_write_begin_newtrunc(file, mapping, pos, len,
+                return block_write_begin_newtrunc(NULL, mapping, pos, len,
                                         flags, pagep, fsdata, get_block);
         }
 
@@ -2654,35 +2654,6 @@ out_release:
 
         return ret;
 }
-EXPORT_SYMBOL(nobh_write_begin_newtrunc);
-
-/*
- * On entry, the page is fully not uptodate.
- * On exit the page is fully uptodate in the areas outside (from,to)
- */
-int nobh_write_begin(struct file *file, struct address_space *mapping,
-                        loff_t pos, unsigned len, unsigned flags,
-                        struct page **pagep, void **fsdata,
-                        get_block_t *get_block)
-{
-        int ret;
-
-        ret = nobh_write_begin_newtrunc(file, mapping, pos, len, flags,
-                                        pagep, fsdata, get_block);
-
-        /*
-         * prepare_write() may have instantiated a few blocks
-         * outside i_size.  Trim these off again. Don't need
-         * i_size_read because we hold i_mutex.
-         */
-        if (unlikely(ret)) {
-                loff_t isize = mapping->host->i_size;
-                if (pos + len > isize)
-                        vmtruncate(mapping->host, isize);
-        }
-
-        return ret;
-}
 EXPORT_SYMBOL(nobh_write_begin);
 
 int nobh_write_end(struct file *file, struct address_space *mapping,
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index f36e967e4fde..348805cd4109 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -806,13 +806,8 @@ ext2_nobh_write_begin(struct file *file, struct address_space *mapping,
 {
         int ret;
 
-        /*
-         * Dir-in-pagecache still uses ext2_write_begin. Would have to rework
-         * directory handling code to pass around offsets rather than struct
-         * pages in order to make this work easily.
-         */
-        ret = nobh_write_begin_newtrunc(file, mapping, pos, len, flags, pagep,
-                                                fsdata, ext2_get_block);
+        ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata,
+                               ext2_get_block);
         if (ret < 0)
                 ext2_write_failed(mapping, pos + len);
         return ret;
diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c
index 79e6cda28181..c38dc1806281 100644
--- a/fs/jfs/inode.c
+++ b/fs/jfs/inode.c
@@ -303,8 +303,17 @@ static int jfs_write_begin(struct file *file, struct address_space *mapping,
                                 loff_t pos, unsigned len, unsigned flags,
                                 struct page **pagep, void **fsdata)
 {
-        return nobh_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
+        int ret;
+
+        ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata,
                                 jfs_get_block);
+        if (unlikely(ret)) {
+                loff_t isize = mapping->host->i_size;
+                if (pos + len > isize)
+                        vmtruncate(mapping->host, isize);
+        }
+
+        return ret;
 }
 
 static sector_t jfs_bmap(struct address_space *mapping, sector_t block)