From 6a7cc46cb279b9dbf12977177330aeebb912aa34 Mon Sep 17 00:00:00 2001
From: "J.W. Schultz" <jw@samba.org>
Date: Tue, 16 Sep 2003 02:49:59 +0000
Subject: [PATCH] Detect and report when open or opendir succeed but read and
 readdir fail caused by network filesystems issues and truncated files. 
 		Thanks to David Norwood and Michael Brown

---
 NEWS     |  4 ++++
 fileio.c | 14 ++++++++++++--
 flist.c  | 11 ++++++++---
 rsync.c  | 18 ++++++++++++------
 rsync.h  | 14 +++++++++++---
 sender.c | 12 +++++++++++-
 6 files changed, 58 insertions(+), 15 deletions(-)

diff --git a/NEWS b/NEWS
index 317157ad..6d78a518 100644
--- a/NEWS
+++ b/NEWS
@@ -92,6 +92,10 @@ Changes since version 2.5.6:
       same path.  A directory still cannot be replaced by a
       regular file unless --delete specified.  (J.W. Schultz)
 
+    * Detect and report when open or opendir succeed but read and
+      readdir fail caused by network filesystems issues and truncated
+      files.  (David Norwood, Michael Brown, J.W. Schultz)
+
   INTERNAL:
 
     * Eliminated vestigial support for old versions that we stopped
diff --git a/fileio.c b/fileio.c
index e8eaa100..088ed639 100644
--- a/fileio.c
+++ b/fileio.c
@@ -115,6 +115,7 @@ struct map_struct *map_file(int fd,OFF_T len)
 	map->p_offset = 0;
 	map->p_fd_offset = 0;
 	map->p_len = 0;
+	map->status = 0;
 
 	return map;
 }
@@ -191,7 +192,11 @@ char *map_ptr(struct map_struct *map,OFF_T offset,int len)
 		}
 
 		if ((nread=read(map->fd,map->p + read_offset,read_size)) != read_size) {
-			if (nread < 0) nread = 0;
+			if (nread < 0) {
+				nread = 0;
+				if (!map->status)
+					map->status = errno;
+			}
 			/* the best we can do is zero the buffer - the file
 			   has changed mid transfer! */
 			memset(map->p+read_offset+nread, 0, read_size - nread);
@@ -206,13 +211,18 @@ char *map_ptr(struct map_struct *map,OFF_T offset,int len)
 }
 
 
-void unmap_file(struct map_struct *map)
+int unmap_file(struct map_struct *map)
 {
+	int	ret;
+
 	if (map->p) {
 		free(map->p);
 		map->p = NULL;
 	}
+	ret = map->status;
 	memset(map, 0, sizeof(*map));
 	free(map);
+
+	return ret;
 }
 
diff --git a/flist.c b/flist.c
index b5ccbf56..8bc3ab37 100644
--- a/flist.c
+++ b/flist.c
@@ -877,14 +877,19 @@ static void send_directory(int f, struct file_list *flist, char *dir)
 		}
 	}
 
-	for (di = readdir(d); di; di = readdir(d)) {
+	for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
 		char *dname = d_name(di);
-		if (dname[0] == '.' && (dname[1] == '\0' ||
-		    (dname[1] == '.' && dname[2] == '\0')))
+		if (dname[0] == '.' && (dname[1] == '\0'
+		    || (dname[1] == '.' && dname[2] == '\0')))
 			continue;
 		strlcpy(p, dname, MAXPATHLEN - l);
 		send_file_name(f, flist, fname, recurse, 0);
 	}
+	if (errno) {
+		io_error = 1;
+		rprintf(FERROR, "readdir(%s): (%d) %s\n",
+		    dir, errno, strerror(errno));
+	}
 
 	if (local_exclude_list)
 		free_exclude_list(&local_exclude_list); /* Zeros pointer too */
diff --git a/rsync.c b/rsync.c
index 11414025..0fdc4794 100644
--- a/rsync.c
+++ b/rsync.c
@@ -88,10 +88,10 @@ int delete_file(char *fname)
 		return -1;
 	}
 
-	for (di=readdir(d); di; di=readdir(d)) {
+	for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
 		char *dname = d_name(di);
-		if (strcmp(dname,".")==0 ||
-		    strcmp(dname,"..")==0)
+		if (strcmp(dname,".") == 0
+		    || strcmp(dname,"..") == 0)
 			continue;
 		snprintf(buf, sizeof(buf), "%s/%s", fname, dname);
 		if (verbose > 0)
@@ -101,6 +101,12 @@ int delete_file(char *fname)
 			return -1;
 		}
 	}	
+	if (errno) {
+		rprintf(FERROR, "delete_file: readdir(%s): (%d) %s\n",
+		    fname, errno, strerror(errno));
+		closedir(d);
+		return -1;
+	}
 
 	closedir(d);
 	
@@ -148,7 +154,7 @@ static int is_in_group(gid_t gid)
 }
 
 int set_perms(char *fname,struct file_struct *file,STRUCT_STAT *st,
-	      int report)
+		int report)
 {
 	int updated = 0;
 	STRUCT_STAT st2;
@@ -218,7 +224,7 @@ int set_perms(char *fname,struct file_struct *file,STRUCT_STAT *st,
 		}
 	}
 #endif
-    
+
 	if (verbose > 1 && report) {
 		if (updated)
 			rprintf(FINFO,"%s\n",fname);
@@ -245,7 +251,7 @@ void finish_transfer(char *fname, char *fnametmp, struct file_struct *file)
 	/* move tmp file over real file */
 	if (robust_rename(fnametmp,fname) != 0) {
 		if (errno == EXDEV) {
-			/* rename failed on cross-filesystem link.  
+			/* rename failed on cross-filesystem link.
 			   Copy the file instead. */
 			if (copy_file(fnametmp,fname, file->mode & INITACCESSPERMS)) {
 				rprintf(FERROR, "copy %s -> \"%s\": %s\n",
diff --git a/rsync.h b/rsync.h
index 3d10af6d..21a19884 100644
--- a/rsync.h
+++ b/rsync.h
@@ -416,9 +416,17 @@ struct sum_struct {
 };
 
 struct map_struct {
-	char *p;
-	int fd,p_size,p_len;
-	OFF_T file_size, p_offset, p_fd_offset;
+	char *p;		/* Window pointer			*/
+	int fd;			/* File Descriptor			*/
+	int p_size;		/* Window size at allocation		*/
+	int p_len;		/* Window size after fill		*/
+				/*    p_size and p_len could be
+				 *    consolodated by using a local
+				 *    variable in map_ptr()		*/
+	int status;		/* first errno from read errors		*/
+	OFF_T file_size;	/* File size (from stat)		*/
+	OFF_T p_offset;		/* Window start				*/
+	OFF_T p_fd_offset;	/* offset of cursor in fd ala lseek	*/
 };
 
 #define MATCHFLG_WILD		0x0001 /* pattern has '*', '[', and/or '?' */
diff --git a/sender.c b/sender.c
index f9a18d26..3d390526 100644
--- a/sender.c
+++ b/sender.c
@@ -277,7 +277,17 @@ void send_files(struct file_list *flist, int f_out, int f_in)
 		}
 
 		if (!read_batch) { /* dw */
-			if (buf) unmap_file(buf);
+			if (buf) {
+				j = unmap_file(buf);
+				if (j) {
+					io_error = 1;
+					rprintf(FERROR,
+					    "read errors mapping %s: (%d) %s\n",
+					    full_fname(fname),
+					    j,
+					    strerror(j));
+				}
+			}
 			close(fd);
 		}
 
-- 
2.34.1