commit b01e0b3c06157377523176c41ec1e57be22a7017
Author: Erez Zadok <[EMAIL PROTECTED]>
Date: Tue Apr 15 19:45:42 2008 -0400
Unionfs: implement splice_read/write methods directly
Must implement splice_read/write directly, using VFS helpers, because we can
no longer rely on generic_file_splice_read/write: they need
address_space_operations 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 ee8dd6f..6141efc 100644
--- a/fs/unionfs/file.c
+++ b/fs/unionfs/file.c
@@ -173,6 +173,66 @@ out:
return err;
}
+static ssize_t unionfs_splice_read(struct file *file, loff_t *ppos,
+ struct pipe_inode_info *pipe, size_t len,
+ unsigned int flags)
+{
+ ssize_t err;
+ struct file *lower_file;
+ struct dentry *dentry = file->f_path.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);
+ err = vfs_splice_to(lower_file, ppos, pipe, len, flags);
+ /* update our inode atime upon a successful lower splice-read */
+ if (err >= 0) {
+ fsstack_copy_attr_atime(dentry->d_inode,
+ lower_file->f_path.dentry->d_inode);
+ unionfs_check_file(file);
+ }
+
+out:
+ unionfs_unlock_dentry(dentry);
+ unionfs_read_unlock(dentry->d_sb);
+ return err;
+}
+
+static ssize_t unionfs_splice_write(struct pipe_inode_info *pipe,
+ struct file *file, loff_t *ppos,
+ size_t len, unsigned int flags)
+{
+ ssize_t err = 0;
+ struct file *lower_file;
+ struct dentry *dentry = file->f_path.dentry;
+
+ unionfs_read_lock(dentry->d_sb, UNIONFS_SMUTEX_PARENT);
+ unionfs_lock_dentry(dentry, UNIONFS_DMUTEX_CHILD);
+ err = unionfs_file_revalidate(file, true);
+ if (unlikely(err))
+ goto out;
+
+ lower_file = unionfs_lower_file(file);
+ err = vfs_splice_from(pipe, lower_file, ppos, len, flags);
+ /* update our inode times+sizes upon a successful lower write */
+ if (err >= 0) {
+ fsstack_copy_inode_size(dentry->d_inode,
+ lower_file->f_path.dentry->d_inode);
+ fsstack_copy_attr_times(dentry->d_inode,
+ lower_file->f_path.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,
@@ -188,4 +248,6 @@ struct file_operations unionfs_main_fops = {
.fsync = unionfs_fsync,
.fasync = unionfs_fasync,
.sendfile = generic_file_sendfile,
+ .splice_read = unionfs_splice_read,
+ .splice_write = unionfs_splice_write,
};
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