Patch based on work from James Peach <jpeach@sgi.com> to convert over to

using pread/pwrite. Modified a little to ensure fsp->pos is correct.
Fix for #889.
Jeremy.
(This used to be commit 019aaaf0df091c3f67048f591e70d4353a02bb9b)

1 files changed, 43 insertions, 0 deletions

diff --git a/source3/smbd/vfs.c b/source3/smbd/vfs.c
index 753db4cece..2f981c743f 100644
--- a/source3/smbd/vfs.c
+++ b/source3/smbd/vfs.c
@@ -71,7 +71,9 @@ static struct vfs_ops default_vfs = {
 		vfswrap_open,
 		vfswrap_close,
 		vfswrap_read,
+		vfswrap_pread,
 		vfswrap_write,
+		vfswrap_pwrite,
 		vfswrap_lseek,
 		vfswrap_sendfile,
 		vfswrap_rename,
@@ -429,6 +431,28 @@ ssize_t vfs_read_data(files_struct *fsp, char *buf, size_t byte_count)
 	return (ssize_t)total;
 }
 
+ssize_t vfs_pread_data(files_struct *fsp, char *buf,
+                size_t byte_count, SMB_OFF_T offset)
+{
+	size_t total=0;
+
+	while (total < byte_count)
+	{
+		ssize_t ret = SMB_VFS_PREAD(fsp, fsp->fd, buf + total,
+					byte_count - total, offset + total);
+
+		if (ret == 0) return total;
+		if (ret == -1) {
+			if (errno == EINTR)
+				continue;
+			else
+				return -1;
+		}
+		total += ret;
+	}
+	return (ssize_t)total;
+}
+
 /****************************************************************************
  Write data to a fd on the vfs.
 ****************************************************************************/
@@ -451,6 +475,25 @@ ssize_t vfs_write_data(files_struct *fsp,const char *buffer,size_t N)
 	return (ssize_t)total;
 }
 
+ssize_t vfs_pwrite_data(files_struct *fsp,const char *buffer,
+                size_t N, SMB_OFF_T offset)
+{
+	size_t total=0;
+	ssize_t ret;
+
+	while (total < N) {
+		ret = SMB_VFS_PWRITE(fsp, fsp->fd, buffer + total,
+                                N - total, offset + total);
+
+		if (ret == -1)
+			return -1;
+		if (ret == 0)
+			return total;
+
+		total += ret;
+	}
+	return (ssize_t)total;
+}
 /****************************************************************************
  An allocate file space call using the vfs interface.
  Allocates space for a file from a filedescriptor.