commit 43c70d84f283a98c683a05d397afbea3ce9d04fa
Author: Erez Zadok <[EMAIL PROTECTED]>
Date: Tue Apr 15 20:04:08 2008 -0400
Unionfs: implement sendfile directly
Must implement sendfile, because we can no longer rely on
generic_file_sendfile: it needs the ->readpage address_space_operation
implemented, which we no longer have.
Signed-off-by: Erez Zadok <[EMAIL PROTECTED]>
diff --git a/fs/unionfs/file.c b/fs/unionfs/file.c
index df3756e..f476c04 100644
--- a/fs/unionfs/file.c
+++ b/fs/unionfs/file.c
@@ -173,6 +173,41 @@ out:
return err;
}
+static ssize_t unionfs_sendfile(struct file *file, loff_t *ppos, size_t count,
+ read_actor_t actor, void *target)
+{
+ ssize_t err;
+ struct file *lower_file;
+ struct dentry *dentry = file->f_dentry;
+
+ unionfs_read_lock(dentry->d_sb, UNIONFS_SMUTEX_PARENT);
+ unionfs_lock_dentry(dentry, UNIONFS_DMUTEX_CHILD);
+ err = unionfs_file_revalidate(file, false);
+ if (unlikely(err))
+ goto out;
+
+ lower_file = unionfs_lower_file(file);
+
+ if (!lower_file->f_op || !lower_file->f_op->sendfile) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ err = lower_file->f_op->sendfile(lower_file, ppos, count,
+ actor, target);
+ /* update our inode atime upon a successful lower sendfile */
+ if (err >= 0) {
+ fsstack_copy_attr_atime(dentry->d_inode,
+ lower_file->f_dentry->d_inode);
+ unionfs_check_file(file);
+ }
+
+out:
+ unionfs_unlock_dentry(dentry);
+ unionfs_read_unlock(dentry->d_sb);
+ return err;
+}
+
struct file_operations unionfs_main_fops = {
.llseek = generic_file_llseek,
.read = do_sync_read,
@@ -187,5 +222,5 @@ struct file_operations unionfs_main_fops = {
.release = unionfs_file_release,
.fsync = unionfs_fsync,
.fasync = unionfs_fasync,
- .sendfile = generic_file_sendfile,
+ .sendfile = unionfs_sendfile,
};
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