diff --git a/examples/c/ex_file_system.c b/examples/c/ex_file_system.c
index 6522a386b9a..3b632df252e 100644
--- a/examples/c/ex_file_system.c
+++ b/examples/c/ex_file_system.c
@@ -148,14 +148,14 @@ demo_file_system_create(WT_CONNECTION *conn, WT_CONFIG_ARG *config)
 	file_system = (WT_FILE_SYSTEM *)demo_fs;
 
 	/* Initialize the in-memory jump table. */
-	file_system->directory_list = demo_fs_directory_list;
-	file_system->directory_list_free = demo_fs_directory_list_free;
-	file_system->directory_sync = demo_fs_directory_sync;
-	file_system->exist = demo_fs_exist;
-	file_system->open_file = demo_fs_open;
-	file_system->remove = demo_fs_remove;
-	file_system->rename = demo_fs_rename;
-	file_system->size = demo_fs_size;
+	file_system->fs_directory_list = demo_fs_directory_list;
+	file_system->fs_directory_list_free = demo_fs_directory_list_free;
+	file_system->fs_directory_sync = demo_fs_directory_sync;
+	file_system->fs_exist = demo_fs_exist;
+	file_system->fs_open_file = demo_fs_open;
+	file_system->fs_remove = demo_fs_remove;
+	file_system->fs_rename = demo_fs_rename;
+	file_system->fs_size = demo_fs_size;
 	file_system->terminate = demo_fs_terminate;
 
 	if ((ret = conn->set_file_system(conn, file_system, NULL)) != 0) {
@@ -236,20 +236,20 @@ demo_fs_open(WT_FILE_SYSTEM *file_system, WT_SESSION *session,
 	 * the functionality.
 	 */
 	file_handle->close = demo_file_close;
-	file_handle->fadvise = NULL;
-	file_handle->fallocate = NULL;
-	file_handle->fallocate_nolock = NULL;
-	file_handle->lock = demo_file_lock;
-	file_handle->map = NULL;
-	file_handle->map_discard = NULL;
-	file_handle->map_preload = NULL;
-	file_handle->unmap = NULL;
-	file_handle->read = demo_file_read;
-	file_handle->size = demo_file_size;
-	file_handle->sync = demo_file_sync;
-	file_handle->sync_nowait = demo_file_sync_nowait;
-	file_handle->truncate = demo_file_truncate;
-	file_handle->write = demo_file_write;
+	file_handle->fh_advise = NULL;
+	file_handle->fh_allocate = NULL;
+	file_handle->fh_allocate_nolock = NULL;
+	file_handle->fh_lock = demo_file_lock;
+	file_handle->fh_map = NULL;
+	file_handle->fh_map_discard = NULL;
+	file_handle->fh_map_preload = NULL;
+	file_handle->fh_unmap = NULL;
+	file_handle->fh_read = demo_file_read;
+	file_handle->fh_size = demo_file_size;
+	file_handle->fh_sync = demo_file_sync;
+	file_handle->fh_sync_nowait = demo_file_sync_nowait;
+	file_handle->fh_truncate = demo_file_truncate;
+	file_handle->fh_write = demo_file_write;
 
 	TAILQ_INSERT_HEAD(&demo_fs->fileq, demo_fh, q);
 	++demo_fs->opened_unique_file_count;
diff --git a/src/block/block_map.c b/src/block/block_map.c
index ce6fe8602f5..d2c70fb4c49 100644
--- a/src/block/block_map.c
+++ b/src/block/block_map.c
@@ -46,7 +46,7 @@ __wt_block_map(WT_SESSION_IMPL *session, WT_BLOCK *block,
 	 * There may be no underlying functionality.
 	 */
 	handle = block->fh->handle;
-	if (handle->map == NULL)
+	if (handle->fh_map == NULL)
 		return (0);
 
 	/*
@@ -54,7 +54,7 @@ __wt_block_map(WT_SESSION_IMPL *session, WT_BLOCK *block,
 	 * Ignore not-supported errors, we'll read the file through the cache
 	 * if map fails.
 	 */
-	ret = handle->map(handle,
+	ret = handle->fh_map(handle,
 	    (WT_SESSION *)session, mapped_regionp, lengthp, mapped_cookiep);
 	if (ret == ENOTSUP) {
 		*(void **)mapped_regionp = NULL;
@@ -76,6 +76,6 @@ __wt_block_unmap(WT_SESSION_IMPL *session,
 
 	/* Unmap the file from memory. */
 	handle = block->fh->handle;
-	return (handle->unmap(handle,
+	return (handle->fh_unmap(handle,
 	    (WT_SESSION *)session, mapped_region, length, mapped_cookie));
 }
diff --git a/src/block/block_mgr.c b/src/block/block_mgr.c
index 465952d8ca5..971fe713f83 100644
--- a/src/block/block_mgr.c
+++ b/src/block/block_mgr.c
@@ -311,7 +311,7 @@ __bm_map_discard(WT_BM *bm, WT_SESSION_IMPL *session, void *map, size_t len)
 	WT_FILE_HANDLE *handle;
 
 	handle = bm->block->fh->handle;
-	return (handle->map_discard(
+	return (handle->fh_map_discard(
 	    handle, (WT_SESSION *)session, map, len, bm->mapped_cookie));
 }
 
diff --git a/src/block/block_read.c b/src/block/block_read.c
index 7304f6ff4bc..97157e4a0f1 100644
--- a/src/block/block_read.c
+++ b/src/block/block_read.c
@@ -35,11 +35,11 @@ __wt_bm_preload(
 
 	handle = block->fh->handle;
 	mapped = bm->map != NULL && offset + size <= (wt_off_t)bm->maplen;
-	if (mapped && handle->map_preload != NULL)
-		ret = handle->map_preload(handle, (WT_SESSION *)session,
+	if (mapped && handle->fh_map_preload != NULL)
+		ret = handle->fh_map_preload(handle, (WT_SESSION *)session,
 		    (uint8_t *)bm->map + offset, size, bm->mapped_cookie);
-	if (!mapped && handle->fadvise != NULL)
-		ret = handle->fadvise(handle, (WT_SESSION *)session,
+	if (!mapped && handle->fh_advise != NULL)
+		ret = handle->fh_advise(handle, (WT_SESSION *)session,
 		    (wt_off_t)offset, (wt_off_t)size, WT_FILE_HANDLE_WILLNEED);
 	if (ret != EBUSY && ret != ENOTSUP)
 		return (ret);
@@ -78,10 +78,10 @@ __wt_bm_read(WT_BM *bm, WT_SESSION_IMPL *session,
 	 */
 	handle = block->fh->handle;
 	mapped = bm->map != NULL && offset + size <= (wt_off_t)bm->maplen;
-	if (mapped && handle->map_preload != NULL) {
+	if (mapped && handle->fh_map_preload != NULL) {
 		buf->data = (uint8_t *)bm->map + offset;
 		buf->size = size;
-		ret = handle->map_preload(handle, (WT_SESSION *)session,
+		ret = handle->fh_map_preload(handle, (WT_SESSION *)session,
 		    buf->data, buf->size,bm->mapped_cookie);
 
 		WT_STAT_FAST_CONN_INCR(session, block_map_read);
diff --git a/src/block/block_write.c b/src/block/block_write.c
index 4f1224f3c13..1fefeee09da 100644
--- a/src/block/block_write.c
+++ b/src/block/block_write.c
@@ -52,7 +52,7 @@ __wt_block_discard(WT_SESSION_IMPL *session, WT_BLOCK *block, size_t added_size)
 
 	/* The file may not support this call. */
 	handle = block->fh->handle;
-	if (handle->fadvise == NULL)
+	if (handle->fh_advise == NULL)
 		return (0);
 
 	/* The call may not be configured. */
@@ -67,7 +67,7 @@ __wt_block_discard(WT_SESSION_IMPL *session, WT_BLOCK *block, size_t added_size)
 		return (0);
 
 	block->os_cache = 0;
-	ret = handle->fadvise(handle, (WT_SESSION *)session,
+	ret = handle->fh_advise(handle, (WT_SESSION *)session,
 	    (wt_off_t)0, (wt_off_t)0, WT_FILE_HANDLE_DONTNEED);
 	return (ret == EBUSY || ret == ENOTSUP ? 0 : ret);
 }
@@ -128,7 +128,8 @@ __wt_block_extend(WT_SESSION_IMPL *session, WT_BLOCK *block,
 	 * and remember that ftruncate requires locking.
 	 */
 	handle = fh->handle;
-	if (handle->fallocate != NULL || handle->fallocate_nolock != NULL) {
+	if (handle->fh_allocate != NULL ||
+	    handle->fh_allocate_nolock != NULL) {
 		/*
 		 * Release any locally acquired lock if not needed to extend the
 		 * file, extending the file may require updating on-disk file's
@@ -136,7 +137,7 @@ __wt_block_extend(WT_SESSION_IMPL *session, WT_BLOCK *block,
 		 * configure for file extension on systems that require locking
 		 * over the extend call.)
 		 */
-		if (handle->fallocate_nolock != NULL && *release_lockp) {
+		if (handle->fh_allocate_nolock != NULL && *release_lockp) {
 			*release_lockp = locked = false;
 			__wt_spin_unlock(session, &block->live_lock);
 		}
diff --git a/src/conn/conn_api.c b/src/conn/conn_api.c
index 18ad383ec74..6e7b07693d5 100644
--- a/src/conn/conn_api.c
+++ b/src/conn/conn_api.c
@@ -1919,16 +1919,16 @@ __conn_chk_file_system(WT_SESSION_IMPL *session, bool readonly)
 		WT_RET_MSG(session, EINVAL,				\
 		    "a WT_FILE_SYSTEM.%s method must be configured", #name)
 
-	WT_CONN_SET_FILE_SYSTEM_REQ(directory_list);
-	WT_CONN_SET_FILE_SYSTEM_REQ(directory_list_free);
+	WT_CONN_SET_FILE_SYSTEM_REQ(fs_directory_list);
+	WT_CONN_SET_FILE_SYSTEM_REQ(fs_directory_list_free);
 	/* not required: directory_sync */
-	WT_CONN_SET_FILE_SYSTEM_REQ(exist);
-	WT_CONN_SET_FILE_SYSTEM_REQ(open_file);
+	WT_CONN_SET_FILE_SYSTEM_REQ(fs_exist);
+	WT_CONN_SET_FILE_SYSTEM_REQ(fs_open_file);
 	if (!readonly) {
-		WT_CONN_SET_FILE_SYSTEM_REQ(remove);
-		WT_CONN_SET_FILE_SYSTEM_REQ(rename);
+		WT_CONN_SET_FILE_SYSTEM_REQ(fs_remove);
+		WT_CONN_SET_FILE_SYSTEM_REQ(fs_rename);
 	}
-	WT_CONN_SET_FILE_SYSTEM_REQ(size);
+	WT_CONN_SET_FILE_SYSTEM_REQ(fs_size);
 
 	return (0);
 }
diff --git a/src/include/extern.h b/src/include/extern.h
index 53e49e51a26..f534785ebea 100644
--- a/src/include/extern.h
+++ b/src/include/extern.h
@@ -730,7 +730,7 @@ extern int __wt_dlsym(WT_SESSION_IMPL *session, WT_DLH *dlh, const char *name, b
 extern int __wt_epoch(WT_SESSION_IMPL *session, struct timespec *tsp);
 extern int __wt_errno(void);
 extern int __wt_filename(WT_SESSION_IMPL *session, const char *name, char **path);
-extern int __wt_fopen(WT_SESSION_IMPL *session, const char *name, uint32_t open_flags, uint32_t flags, WT_FSTREAM **fsp);
+extern int __wt_fopen(WT_SESSION_IMPL *session, const char *name, uint32_t open_flags, uint32_t flags, WT_FSTREAM **fstrp);
 extern int __wt_get_vm_pagesize(void);
 extern int __wt_getenv(WT_SESSION_IMPL *session, const char *variable, const char **envp);
 extern int __wt_getlasterror(void);
diff --git a/src/include/os.h b/src/include/os.h
index bf60f32f764..1e08683bc83 100644
--- a/src/include/os.h
+++ b/src/include/os.h
@@ -141,7 +141,8 @@ struct __wt_fstream {
 	uint32_t flags;
 
 	int (*close)(WT_SESSION_IMPL *, WT_FSTREAM *);
-	int (*flush)(WT_SESSION_IMPL *, WT_FSTREAM *);
-	int (*getline)(WT_SESSION_IMPL *, WT_FSTREAM *, WT_ITEM *);
-	int (*printf)(WT_SESSION_IMPL *, WT_FSTREAM *, const char *, va_list);
+	int (*fstr_flush)(WT_SESSION_IMPL *, WT_FSTREAM *);
+	int (*fstr_getline)(WT_SESSION_IMPL *, WT_FSTREAM *, WT_ITEM *);
+	int (*fstr_printf)(
+	    WT_SESSION_IMPL *, WT_FSTREAM *, const char *, va_list);
 };
diff --git a/src/include/os_fhandle.i b/src/include/os_fhandle.i
index 8d2cda4b305..cf790d6bc4d 100644
--- a/src/include/os_fhandle.i
+++ b/src/include/os_fhandle.i
@@ -22,11 +22,11 @@ __wt_fsync(WT_SESSION_IMPL *session, WT_FH *fh, bool block)
 
 	handle = fh->handle;
 	if (block)
-		return (handle->sync == NULL ? 0 :
-		    handle->sync(handle, (WT_SESSION *)session));
+		return (handle->fh_sync == NULL ? 0 :
+		    handle->fh_sync(handle, (WT_SESSION *)session));
 	else
-		return (handle->sync_nowait == NULL ? 0 :
-		    handle->sync_nowait(handle, (WT_SESSION *)session));
+		return (handle->fh_sync_nowait == NULL ? 0 :
+		    handle->fh_sync_nowait(handle, (WT_SESSION *)session));
 }
 
 /*
@@ -55,14 +55,14 @@ __wt_fallocate(
 	 * flavor, that failed, and we have to fallback to the locking flavor.
 	 */
 	handle = fh->handle;
-	if (handle->fallocate_nolock != NULL) {
-		if ((ret = handle->fallocate_nolock(
+	if (handle->fh_allocate_nolock != NULL) {
+		if ((ret = handle->fh_allocate_nolock(
 		    handle, (WT_SESSION *)session, offset, len)) == 0)
 			return (0);
 		WT_RET_ERROR_OK(ret, ENOTSUP);
 	}
-	if (handle->fallocate != NULL)
-		return (handle->fallocate(
+	if (handle->fh_allocate != NULL)
+		return (handle->fh_allocate(
 		    handle, (WT_SESSION *)session, offset, len));
 	return (ENOTSUP);
 }
@@ -80,8 +80,8 @@ __wt_file_lock(WT_SESSION_IMPL * session, WT_FH *fh, bool lock)
 	    "%s: handle-lock: %s", fh->handle->name, lock ? "lock" : "unlock"));
 
 	handle = fh->handle;
-	return (handle->lock == NULL ? 0 :
-	    handle->lock(handle, (WT_SESSION*)session, lock));
+	return (handle->fh_lock == NULL ? 0 :
+	    handle->fh_lock(handle, (WT_SESSION*)session, lock));
 }
 
 /*
@@ -98,7 +98,7 @@ __wt_read(
 
 	WT_STAT_FAST_CONN_INCR(session, read_io);
 
-	return (fh->handle->read(
+	return (fh->handle->fh_read(
 	    fh->handle, (WT_SESSION *)session, offset, len, buf));
 }
 
@@ -112,7 +112,7 @@ __wt_filesize(WT_SESSION_IMPL *session, WT_FH *fh, wt_off_t *sizep)
 	WT_RET(__wt_verbose(
 	    session, WT_VERB_HANDLEOPS, "%s: handle-size", fh->handle->name));
 
-	return (fh->handle->size(fh->handle, (WT_SESSION *)session, sizep));
+	return (fh->handle->fh_size(fh->handle, (WT_SESSION *)session, sizep));
 }
 
 /*
@@ -128,7 +128,8 @@ __wt_ftruncate(WT_SESSION_IMPL *session, WT_FH *fh, wt_off_t len)
 	    "%s: handle-truncate: %" PRIuMAX,
 	    fh->handle->name, (uintmax_t)len));
 
-	return (fh->handle->truncate(fh->handle, (WT_SESSION *)session, len));
+	return (fh->handle->fh_truncate(
+	    fh->handle, (WT_SESSION *)session, len));
 }
 
 /*
@@ -149,6 +150,6 @@ __wt_write(WT_SESSION_IMPL *session,
 
 	WT_STAT_FAST_CONN_INCR(session, write_io);
 
-	return (fh->handle->write(
+	return (fh->handle->fh_write(
 	    fh->handle, (WT_SESSION *)session, offset, len, buf));
 }
diff --git a/src/include/os_fs.i b/src/include/os_fs.i
index 151898711d8..88ee71d953a 100644
--- a/src/include/os_fs.i
+++ b/src/include/os_fs.i
@@ -30,7 +30,7 @@ __wt_fs_directory_list(WT_SESSION_IMPL *session,
 
 	file_system = S2C(session)->file_system;
 	wt_session = (WT_SESSION *)session;
-	ret = file_system->directory_list(
+	ret = file_system->fs_directory_list(
 	    file_system, wt_session, path, prefix, dirlistp, countp);
 
 	__wt_free(session, path);
@@ -52,7 +52,7 @@ __wt_fs_directory_list_free(
 	if (*dirlistp != NULL) {
 		file_system = S2C(session)->file_system;
 		wt_session = (WT_SESSION *)session;
-		ret = file_system->directory_list_free(
+		ret = file_system->fs_directory_list_free(
 		    file_system, wt_session, *dirlistp, count);
 	}
 
@@ -88,7 +88,7 @@ __wt_fs_directory_sync(WT_SESSION_IMPL *session, const char *name)
 	 * needed.
 	 */
 	file_system = S2C(session)->file_system;
-	if (file_system->directory_sync == NULL)
+	if (file_system->fs_directory_sync == NULL)
 		return (0);
 
 	copy = NULL;
@@ -109,7 +109,7 @@ __wt_fs_directory_sync(WT_SESSION_IMPL *session, const char *name)
 	}
 
 	wt_session = (WT_SESSION *)session;
-	ret = file_system->directory_sync(file_system, wt_session, name);
+	ret = file_system->fs_directory_sync(file_system, wt_session, name);
 
 	__wt_free(session, copy);
 	return (ret);
@@ -133,7 +133,7 @@ __wt_fs_exist(WT_SESSION_IMPL *session, const char *name, bool *existp)
 
 	file_system = S2C(session)->file_system;
 	wt_session = (WT_SESSION *)session;
-	ret = file_system->exist(file_system, wt_session, path, existp);
+	ret = file_system->fs_exist(file_system, wt_session, path, existp);
 
 	__wt_free(session, path);
 	return (ret);
@@ -169,7 +169,7 @@ __wt_fs_remove(WT_SESSION_IMPL *session, const char *name)
 
 	file_system = S2C(session)->file_system;
 	wt_session = (WT_SESSION *)session;
-	ret = file_system->remove(file_system, wt_session, path);
+	ret = file_system->fs_remove(file_system, wt_session, path);
 
 	__wt_free(session, path);
 	return (ret);
@@ -211,7 +211,8 @@ __wt_fs_rename(WT_SESSION_IMPL *session, const char *from, const char *to)
 
 	file_system = S2C(session)->file_system;
 	wt_session = (WT_SESSION *)session;
-	ret = file_system->rename(file_system, wt_session, from_path, to_path);
+	ret = file_system->fs_rename(
+	    file_system, wt_session, from_path, to_path);
 
 err:	__wt_free(session, from_path);
 	__wt_free(session, to_path);
@@ -236,7 +237,7 @@ __wt_fs_size(WT_SESSION_IMPL *session, const char *name, wt_off_t *sizep)
 
 	file_system = S2C(session)->file_system;
 	wt_session = (WT_SESSION *)session;
-	ret = file_system->size(file_system, wt_session, path, sizep);
+	ret = file_system->fs_size(file_system, wt_session, path, sizep);
 
 	__wt_free(session, path);
 	return (ret);
diff --git a/src/include/os_fstream.i b/src/include/os_fstream.i
index 37a6039d1b7..8c0fdadbdb0 100644
--- a/src/include/os_fstream.i
+++ b/src/include/os_fstream.i
@@ -11,9 +11,9 @@
  *	Get a line from a stream.
  */
 static inline int
-__wt_getline(WT_SESSION_IMPL *session, WT_FSTREAM *fs, WT_ITEM *buf)
+__wt_getline(WT_SESSION_IMPL *session, WT_FSTREAM *fstr, WT_ITEM *buf)
 {
-	return (fs->getline(session, fs, buf));
+	return (fstr->fstr_getline(session, fstr, buf));
 }
 
 /*
@@ -21,14 +21,14 @@ __wt_getline(WT_SESSION_IMPL *session, WT_FSTREAM *fs, WT_ITEM *buf)
  *	Close a stream.
  */
 static inline int
-__wt_fclose(WT_SESSION_IMPL *session, WT_FSTREAM **fsp)
+__wt_fclose(WT_SESSION_IMPL *session, WT_FSTREAM **fstrp)
 {
-	WT_FSTREAM *fs;
+	WT_FSTREAM *fstr;
 
-	if ((fs = *fsp) == NULL)
+	if ((fstr = *fstrp) == NULL)
 		return (0);
-	*fsp = NULL;
-	return (fs->close(session, fs));
+	*fstrp = NULL;
+	return (fstr->close(session, fstr));
 }
 
 /*
@@ -36,9 +36,9 @@ __wt_fclose(WT_SESSION_IMPL *session, WT_FSTREAM **fsp)
  *	Flush a stream.
  */
 static inline int
-__wt_fflush(WT_SESSION_IMPL *session, WT_FSTREAM *fs)
+__wt_fflush(WT_SESSION_IMPL *session, WT_FSTREAM *fstr)
 {
-	return (fs->flush(session, fs));
+	return (fstr->fstr_flush(session, fstr));
 }
 
 /*
@@ -47,12 +47,12 @@ __wt_fflush(WT_SESSION_IMPL *session, WT_FSTREAM *fs)
  */
 static inline int
 __wt_vfprintf(
-    WT_SESSION_IMPL *session, WT_FSTREAM *fs, const char *fmt, va_list ap)
+    WT_SESSION_IMPL *session, WT_FSTREAM *fstr, const char *fmt, va_list ap)
 {
 	WT_RET(__wt_verbose(
-	    session, WT_VERB_HANDLEOPS, "%s: handle-printf", fs->name));
+	    session, WT_VERB_HANDLEOPS, "%s: handle-printf", fstr->name));
 
-	return (fs->printf(session, fs, fmt, ap));
+	return (fstr->fstr_printf(session, fstr, fmt, ap));
 }
 
 /*
@@ -60,14 +60,14 @@ __wt_vfprintf(
  *	ANSI C fprintf.
  */
 static inline int
-__wt_fprintf(WT_SESSION_IMPL *session, WT_FSTREAM *fs, const char *fmt, ...)
+__wt_fprintf(WT_SESSION_IMPL *session, WT_FSTREAM *fstr, const char *fmt, ...)
     WT_GCC_FUNC_ATTRIBUTE((format (printf, 3, 4)))
 {
 	WT_DECL_RET;
 	va_list ap;
 
 	va_start(ap, fmt);
-	ret = __wt_vfprintf(session, fs, fmt, ap);
+	ret = __wt_vfprintf(session, fstr, fmt, ap);
 	va_end(ap);
 
 	return (ret);
@@ -79,18 +79,18 @@ __wt_fprintf(WT_SESSION_IMPL *session, WT_FSTREAM *fs, const char *fmt, ...)
  */
 static inline int
 __wt_sync_and_rename(WT_SESSION_IMPL *session,
-    WT_FSTREAM **fsp, const char *from, const char *to)
+    WT_FSTREAM **fstrp, const char *from, const char *to)
 {
 	WT_DECL_RET;
-	WT_FSTREAM *fs;
+	WT_FSTREAM *fstr;
 
-	fs = *fsp;
-	*fsp = NULL;
+	fstr = *fstrp;
+	*fstrp = NULL;
 
 	/* Flush to disk and close the handle. */
-	WT_TRET(__wt_fflush(session, fs));
-	WT_TRET(__wt_fsync(session, fs->fh, true));
-	WT_TRET(__wt_fclose(session, &fs));
+	WT_TRET(__wt_fflush(session, fstr));
+	WT_TRET(__wt_fsync(session, fstr->fh, true));
+	WT_TRET(__wt_fclose(session, &fstr));
 	WT_RET(ret);
 
 	return (__wt_rename_and_sync_directory(session, from, to));
diff --git a/src/include/wiredtiger.in b/src/include/wiredtiger.in
index 4aef84f5f8c..243841c3227 100644
--- a/src/include/wiredtiger.in
+++ b/src/include/wiredtiger.in
@@ -3756,9 +3756,9 @@ struct __wt_file_system {
 	 *    directory.
 	 * @param[out] countp the method the number of entries returned
 	 */
-	int (*directory_list)(WT_FILE_SYSTEM *file_system, WT_SESSION *session,
-	    const char *directory, const char *prefix, char ***dirlist,
-	    uint32_t *countp);
+	int (*fs_directory_list)(WT_FILE_SYSTEM *file_system,
+	    WT_SESSION *session, const char *directory, const char *prefix,
+	    char ***dirlist, uint32_t *countp);
 
 	/*!
 	 * Free memory allocated by WT_FILE_SYSTEM::directory_list.
@@ -3770,7 +3770,7 @@ struct __wt_file_system {
 	 * @param dirlist array returned by WT_FILE_SYSTEM::directory_list
 	 * @param count count returned by WT_FILE_SYSTEM::directory_list
 	 */
-	int (*directory_list_free)(WT_FILE_SYSTEM *file_system,
+	int (*fs_directory_list_free)(WT_FILE_SYSTEM *file_system,
 	    WT_SESSION *session, char **dirlist, uint32_t count);
 
 	/*!
@@ -3787,7 +3787,7 @@ struct __wt_file_system {
 	 * @param session the current WiredTiger session
 	 * @param directory the name of the directory
 	 */
-	int (*directory_sync)(WT_FILE_SYSTEM *file_system,
+	int (*fs_directory_sync)(WT_FILE_SYSTEM *file_system,
 	    WT_SESSION *session, const char *directory);
 
 	/*!
@@ -3800,7 +3800,7 @@ struct __wt_file_system {
 	 * @param name the name of the file
 	 * @param[out] existp If the named file system object exists
 	 */
-	int (*exist)(WT_FILE_SYSTEM *file_system,
+	int (*fs_exist)(WT_FILE_SYSTEM *file_system,
 	    WT_SESSION *session, const char *name, bool *existp);
 
 	/*!
@@ -3824,7 +3824,7 @@ struct __wt_file_system {
 	 *    with the WT_FILE_HANDLE:: structure should declare and allocate
 	 *    their own structure as a superset of a WT_FILE_HANDLE:: structure.
 	 */
-	int (*open_file)(WT_FILE_SYSTEM *file_system, WT_SESSION *session,
+	int (*fs_open_file)(WT_FILE_SYSTEM *file_system, WT_SESSION *session,
 	    const char *name, WT_OPEN_FILE_TYPE file_type, uint32_t flags,
 	    WT_FILE_HANDLE **file_handlep);
 
@@ -3840,7 +3840,7 @@ struct __wt_file_system {
 	 * @param session the current WiredTiger session
 	 * @param name the name of the file system object
 	 */
-	int (*remove)(
+	int (*fs_remove)(
 	    WT_FILE_SYSTEM *file_system, WT_SESSION *session, const char *name);
 
 	/*!
@@ -3856,7 +3856,7 @@ struct __wt_file_system {
 	 * @param from the original name of the object
 	 * @param to the new name for the object
 	 */
-	int (*rename)(WT_FILE_SYSTEM *file_system,
+	int (*fs_rename)(WT_FILE_SYSTEM *file_system,
 	    WT_SESSION *session, const char *from, const char *to);
 
 	/*!
@@ -3869,7 +3869,7 @@ struct __wt_file_system {
 	 * @param name the name of the file system object
 	 * @param[out] sizep the size of the file system entry
 	 */
-	int (*size)(WT_FILE_SYSTEM *file_system,
+	int (*fs_size)(WT_FILE_SYSTEM *file_system,
 	    WT_SESSION *session, const char *name, wt_off_t *sizep);
 
 	/*!
@@ -3938,7 +3938,7 @@ struct __wt_file_handle {
 	 * @param advice one of ::WT_FILE_HANDLE_WILLNEED or
 	 *    ::WT_FILE_HANDLE_DONTNEED.
 	 */
-	int (*fadvise)(WT_FILE_HANDLE *file_handle,
+	int (*fh_advise)(WT_FILE_HANDLE *file_handle,
 	    WT_SESSION *session, wt_off_t offset, wt_off_t len, int advice);
 
 	/*!
@@ -3960,7 +3960,7 @@ struct __wt_file_handle {
 	 * @param offset the file offset
 	 * @param len the size of the advisory
 	 */
-	int (*fallocate)(WT_FILE_HANDLE *file_handle,
+	int (*fh_allocate)(WT_FILE_HANDLE *file_handle,
 	    WT_SESSION *session, wt_off_t, wt_off_t);
 
 	/*!
@@ -3982,7 +3982,7 @@ struct __wt_file_handle {
 	 * @param offset the file offset
 	 * @param len the size of the advisory
 	 */
-	int (*fallocate_nolock)(WT_FILE_HANDLE *file_handle,
+	int (*fh_allocate_nolock)(WT_FILE_HANDLE *file_handle,
 	    WT_SESSION *session, wt_off_t, wt_off_t);
 
 	/*!
@@ -3995,7 +3995,7 @@ struct __wt_file_handle {
 	 * @param session the current WiredTiger session
 	 * @param lock whether to lock or unlock
 	 */
-	int (*lock)(
+	int (*fh_lock)(
 	    WT_FILE_HANDLE *file_handle, WT_SESSION *session, bool lock);
 
 	/*!
@@ -4016,7 +4016,7 @@ struct __wt_file_handle {
 	 *    which can be optionally stored a pointer to an opaque cookie
 	 *    which is subsequently passed to WT_FILE_HANDLE::unmap.
 	 */
-	int (*map)(WT_FILE_HANDLE *file_handle, WT_SESSION *session,
+	int (*fh_map)(WT_FILE_HANDLE *file_handle, WT_SESSION *session,
 	    void *mapped_regionp, size_t *lengthp, void *mapped_cookiep);
 
 	/*!
@@ -4035,7 +4035,7 @@ struct __wt_file_handle {
 	 * @param length the length of the mapped region to discard
 	 * @param mapped_cookie any cookie set by the WT_FILE_HANDLE::map method
 	 */
-	int (*map_discard)(WT_FILE_HANDLE *file_handle,
+	int (*fh_map_discard)(WT_FILE_HANDLE *file_handle,
 	    WT_SESSION *session, void *map, size_t length, void *mapped_cookie);
 
 	/*!
@@ -4054,7 +4054,7 @@ struct __wt_file_handle {
 	 * @param length the size of the mapped region to preload
 	 * @param mapped_cookie any cookie set by the WT_FILE_HANDLE::map method
 	 */
-	int (*map_preload)(WT_FILE_HANDLE *file_handle, WT_SESSION *session,
+	int (*fh_map_preload)(WT_FILE_HANDLE *file_handle, WT_SESSION *session,
 	    const void *map, size_t length, void *mapped_cookie);
 
 	/*!
@@ -4072,7 +4072,7 @@ struct __wt_file_handle {
 	 * @param length the length of the mapped region
 	 * @param mapped_cookie any cookie set by the WT_FILE_HANDLE::map method
 	 */
-	int (*unmap)(WT_FILE_HANDLE *file_handle, WT_SESSION *session,
+	int (*fh_unmap)(WT_FILE_HANDLE *file_handle, WT_SESSION *session,
 	    void *mapped_region, size_t length, void *mapped_cookie);
 
 	/*!
@@ -4086,7 +4086,7 @@ struct __wt_file_handle {
 	 * @param len the amount to read
 	 * @param[out] buf buffer to hold the content read from file
 	 */
-	int (*read)(WT_FILE_HANDLE *file_handle,
+	int (*fh_read)(WT_FILE_HANDLE *file_handle,
 	    WT_SESSION *session, wt_off_t offset, size_t len, void *buf);
 
 	/*!
@@ -4098,7 +4098,7 @@ struct __wt_file_handle {
 	 * @param session the current WiredTiger session
 	 * @param sizep the size of the file
 	 */
-	int (*size)(
+	int (*fh_size)(
 	    WT_FILE_HANDLE *file_handle, WT_SESSION *session, wt_off_t *sizep);
 
 	/*!
@@ -4113,7 +4113,7 @@ struct __wt_file_handle {
 	 * @param file_handle the WT_FILE_HANDLE
 	 * @param session the current WiredTiger session
 	 */
-	int (*sync)(WT_FILE_HANDLE *file_handle, WT_SESSION *session);
+	int (*fh_sync)(WT_FILE_HANDLE *file_handle, WT_SESSION *session);
 
 	/*!
 	 * Schedule the outstanding file writes required for durability and
@@ -4127,7 +4127,7 @@ struct __wt_file_handle {
 	 * @param file_handle the WT_FILE_HANDLE
 	 * @param session the current WiredTiger session
 	 */
-	int (*sync_nowait)(WT_FILE_HANDLE *file_handle, WT_SESSION *session);
+	int (*fh_sync_nowait)(WT_FILE_HANDLE *file_handle, WT_SESSION *session);
 
 	/*!
 	 * Lengthen or shorten a file to the specified length, based on the
@@ -4142,7 +4142,7 @@ struct __wt_file_handle {
 	 * @param session the current WiredTiger session
 	 * @param length desired file size after truncate
 	 */
-	int (*truncate)(
+	int (*fh_truncate)(
 	    WT_FILE_HANDLE *file_handle, WT_SESSION *session, wt_off_t length);
 
 	/*!
@@ -4159,7 +4159,7 @@ struct __wt_file_handle {
 	 * @param length amount of data to write
 	 * @param buf content to be written to the file
 	 */
-	int (*write)(WT_FILE_HANDLE *file_handle, WT_SESSION *session,
+	int (*fh_write)(WT_FILE_HANDLE *file_handle, WT_SESSION *session,
 	    wt_off_t offset, size_t length, const void *buf);
 };
 #endif /* !defined(SWIG) */
diff --git a/src/os_common/os_fhandle.c b/src/os_common/os_fhandle.c
index 818829203e0..50404c8b354 100644
--- a/src/os_common/os_fhandle.c
+++ b/src/os_common/os_fhandle.c
@@ -32,13 +32,13 @@ __fhandle_method_finalize(
 	/* not required: map_discard */
 	/* not required: map_preload */
 	/* not required: map_unmap */
-	WT_HANDLE_METHOD_REQ(read);
-	WT_HANDLE_METHOD_REQ(size);
+	WT_HANDLE_METHOD_REQ(fh_read);
+	WT_HANDLE_METHOD_REQ(fh_size);
 	/* not required: sync */
 	/* not required: sync_nowait */
 	if (!readonly) {
-		WT_HANDLE_METHOD_REQ(truncate);
-		WT_HANDLE_METHOD_REQ(write);
+		WT_HANDLE_METHOD_REQ(fh_truncate);
+		WT_HANDLE_METHOD_REQ(fh_write);
 	}
 
 	return (0);
@@ -255,7 +255,7 @@ __wt_open(WT_SESSION_IMPL *session,
 		WT_ERR(__wt_filename(session, name, &path));
 
 	/* Call the underlying open function. */
-	WT_ERR(file_system->open_file(file_system, &session->iface,
+	WT_ERR(file_system->fs_open_file(file_system, &session->iface,
 	    path == NULL ? name : path, file_type, flags, &fh->handle));
 	open_called = true;
 
diff --git a/src/os_common/os_fs_inmemory.c b/src/os_common/os_fs_inmemory.c
index 53da3f10e5c..3e4fe628892 100644
--- a/src/os_common/os_fs_inmemory.c
+++ b/src/os_common/os_fs_inmemory.c
@@ -512,10 +512,10 @@ __im_file_open(WT_FILE_SYSTEM *file_system, WT_SESSION *wt_session,
 	WT_FILE_HANDLE_INSERT(im_fs, im_fh, bucket);
 
 	file_handle->close = __im_file_close;
-	file_handle->read = __im_file_read;
-	file_handle->size = __im_file_size;
-	file_handle->truncate = __im_file_truncate;
-	file_handle->write = __im_file_write;
+	file_handle->fh_read = __im_file_read;
+	file_handle->fh_size = __im_file_size;
+	file_handle->fh_truncate = __im_file_truncate;
+	file_handle->fh_write = __im_file_write;
 
 	*file_handlep = file_handle;
 
@@ -576,13 +576,13 @@ __wt_os_inmemory(WT_SESSION_IMPL *session)
 
 	/* Initialize the in-memory jump table. */
 	file_system = (WT_FILE_SYSTEM *)im_fs;
-	file_system->directory_list = __im_fs_directory_list;
-	file_system->directory_list_free = __im_fs_directory_list_free;
-	file_system->exist = __im_fs_exist;
-	file_system->open_file = __im_file_open;
-	file_system->remove = __im_fs_remove;
-	file_system->rename = __im_fs_rename;
-	file_system->size = __im_fs_size;
+	file_system->fs_directory_list = __im_fs_directory_list;
+	file_system->fs_directory_list_free = __im_fs_directory_list_free;
+	file_system->fs_exist = __im_fs_exist;
+	file_system->fs_open_file = __im_file_open;
+	file_system->fs_remove = __im_fs_remove;
+	file_system->fs_rename = __im_fs_rename;
+	file_system->fs_size = __im_fs_size;
 	file_system->terminate = __im_terminate;
 
 	/* Switch the file system into place. */
diff --git a/src/os_common/os_fstream.c b/src/os_common/os_fstream.c
index df2b07ea91e..0b199529e19 100644
--- a/src/os_common/os_fstream.c
+++ b/src/os_common/os_fstream.c
@@ -16,16 +16,16 @@
  *	Close a stream handle.
  */
 static int
-__fstream_close(WT_SESSION_IMPL *session, WT_FSTREAM *fs)
+__fstream_close(WT_SESSION_IMPL *session, WT_FSTREAM *fstr)
 {
 	WT_DECL_RET;
 
-	if (!F_ISSET(fs, WT_STREAM_READ))
-		WT_TRET(fs->flush(session, fs));
+	if (!F_ISSET(fstr, WT_STREAM_READ))
+		WT_TRET(fstr->fstr_flush(session, fstr));
 
-	WT_TRET(__wt_close(session, &fs->fh));
-	__wt_buf_free(session, &fs->buf);
-	__wt_free(session, fs);
+	WT_TRET(__wt_close(session, &fstr->fh));
+	__wt_buf_free(session, &fstr->buf);
+	__wt_free(session, fstr);
 	return (ret);
 }
 
@@ -34,13 +34,13 @@ __fstream_close(WT_SESSION_IMPL *session, WT_FSTREAM *fs)
  *	Flush the data from a stream.
  */
 static int
-__fstream_flush(WT_SESSION_IMPL *session, WT_FSTREAM *fs)
+__fstream_flush(WT_SESSION_IMPL *session, WT_FSTREAM *fstr)
 {
-	if (fs->buf.size > 0) {
-		WT_RET(__wt_write(
-		    session, fs->fh, fs->off, fs->buf.size, fs->buf.data));
-		fs->off += (wt_off_t)fs->buf.size;
-		fs->buf.size = 0;
+	if (fstr->buf.size > 0) {
+		WT_RET(__wt_write(session,
+		    fstr->fh, fstr->off, fstr->buf.size, fstr->buf.data));
+		fstr->off += (wt_off_t)fstr->buf.size;
+		fstr->buf.size = 0;
 	}
 
 	return (0);
@@ -51,9 +51,9 @@ __fstream_flush(WT_SESSION_IMPL *session, WT_FSTREAM *fs)
  *	Stream flush unsupported.
  */
 static int
-__fstream_flush_notsup(WT_SESSION_IMPL *session, WT_FSTREAM *fs)
+__fstream_flush_notsup(WT_SESSION_IMPL *session, WT_FSTREAM *fstr)
 {
-	WT_RET_MSG(session, ENOTSUP, "%s: flush", fs->name);
+	WT_RET_MSG(session, ENOTSUP, "%s: flush", fstr->name);
 }
 
 /*
@@ -68,7 +68,7 @@ __fstream_flush_notsup(WT_SESSION_IMPL *session, WT_FSTREAM *fs)
  * (so the caller's EOF marker is a returned line length of 0).
  */
 static int
-__fstream_getline(WT_SESSION_IMPL *session, WT_FSTREAM *fs, WT_ITEM *buf)
+__fstream_getline(WT_SESSION_IMPL *session, WT_FSTREAM *fstr, WT_ITEM *buf)
 {
 	const char *p;
 	size_t len;
@@ -82,19 +82,20 @@ __fstream_getline(WT_SESSION_IMPL *session, WT_FSTREAM *fs, WT_ITEM *buf)
 
 	for (;;) {
 		/* Check if we need to refill the buffer. */
-		if (WT_PTRDIFF(fs->buf.data, fs->buf.mem) >= fs->buf.size) {
+		if (WT_PTRDIFF(fstr->buf.data, fstr->buf.mem) >=
+		    fstr->buf.size) {
 			len = WT_MIN(WT_STREAM_BUFSIZE,
-			    (size_t)(fs->size - fs->off));
+			    (size_t)(fstr->size - fstr->off));
 			if (len == 0)
 				break; /* EOF */
-			WT_RET(__wt_buf_initsize(session, &fs->buf, len));
+			WT_RET(__wt_buf_initsize(session, &fstr->buf, len));
 			WT_RET(__wt_read(
-			    session, fs->fh, fs->off, len, fs->buf.mem));
-			fs->off += (wt_off_t)len;
+			    session, fstr->fh, fstr->off, len, fstr->buf.mem));
+			fstr->off += (wt_off_t)len;
 		}
 
-		c = *(p = fs->buf.data);
-		fs->buf.data = ++p;
+		c = *(p = fstr->buf.data);
+		fstr->buf.data = ++p;
 
 		/* Leave space for a trailing NUL. */
 		WT_RET(__wt_buf_extend(session, buf, buf->size + 2));
@@ -116,10 +117,11 @@ __fstream_getline(WT_SESSION_IMPL *session, WT_FSTREAM *fs, WT_ITEM *buf)
  *	Stream getline unsupported.
  */
 static int
-__fstream_getline_notsup(WT_SESSION_IMPL *session, WT_FSTREAM *fs, WT_ITEM *buf)
+__fstream_getline_notsup(
+    WT_SESSION_IMPL *session, WT_FSTREAM *fstr, WT_ITEM *buf)
 {
 	WT_UNUSED(buf);
-	WT_RET_MSG(session, ENOTSUP, "%s: getline", fs->name);
+	WT_RET_MSG(session, ENOTSUP, "%s: getline", fstr->name);
 }
 
 /*
@@ -128,14 +130,14 @@ __fstream_getline_notsup(WT_SESSION_IMPL *session, WT_FSTREAM *fs, WT_ITEM *buf)
  */
 static int
 __fstream_printf(
-    WT_SESSION_IMPL *session, WT_FSTREAM *fs, const char *fmt, va_list ap)
+    WT_SESSION_IMPL *session, WT_FSTREAM *fstr, const char *fmt, va_list ap)
 {
 	WT_ITEM *buf;
 	va_list ap_copy;
 	size_t len, space;
 	char *p;
 
-	buf = &fs->buf;
+	buf = &fstr->buf;
 
 	for (;;) {
 		va_copy(ap_copy, ap);
@@ -149,7 +151,7 @@ __fstream_printf(
 			buf->size += len;
 
 			return (buf->size >= WT_STREAM_BUFSIZE ?
-			    __wt_fflush(session, fs) : 0);
+			    __wt_fflush(session, fstr) : 0);
 		}
 		WT_RET(__wt_buf_extend(session, buf, buf->size + len + 1));
 	}
@@ -161,11 +163,11 @@ __fstream_printf(
  */
 static int
 __fstream_printf_notsup(
-    WT_SESSION_IMPL *session, WT_FSTREAM *fs, const char *fmt, va_list ap)
+    WT_SESSION_IMPL *session, WT_FSTREAM *fstr, const char *fmt, va_list ap)
 {
 	WT_UNUSED(fmt);
 	WT_UNUSED(ap);
-	WT_RET_MSG(session, ENOTSUP, "%s: printf", fs->name);
+	WT_RET_MSG(session, ENOTSUP, "%s: printf", fstr->name);
 }
 
 /*
@@ -174,42 +176,42 @@ __fstream_printf_notsup(
  */
 int
 __wt_fopen(WT_SESSION_IMPL *session,
-    const char *name, uint32_t open_flags, uint32_t flags, WT_FSTREAM **fsp)
+    const char *name, uint32_t open_flags, uint32_t flags, WT_FSTREAM **fstrp)
 {
 	WT_DECL_RET;
 	WT_FH *fh;
-	WT_FSTREAM *fs;
+	WT_FSTREAM *fstr;
 
-	*fsp = NULL;
+	*fstrp = NULL;
 
-	fs = NULL;
+	fstr = NULL;
 
 	WT_RET(__wt_open(
 	    session, name, WT_OPEN_FILE_TYPE_REGULAR, open_flags, &fh));
 
-	WT_ERR(__wt_calloc_one(session, &fs));
-	fs->fh = fh;
-	fs->name = fh->name;
-	fs->flags = flags;
+	WT_ERR(__wt_calloc_one(session, &fstr));
+	fstr->fh = fh;
+	fstr->name = fh->name;
+	fstr->flags = flags;
 
-	fs->close = __fstream_close;
-	WT_ERR(__wt_filesize(session, fh, &fs->size));
+	fstr->close = __fstream_close;
+	WT_ERR(__wt_filesize(session, fh, &fstr->size));
 	if (LF_ISSET(WT_STREAM_APPEND))
-		fs->off = fs->size;
+		fstr->off = fstr->size;
 	if (LF_ISSET(WT_STREAM_APPEND | WT_STREAM_WRITE)) {
-		fs->flush = __fstream_flush;
-		fs->getline = __fstream_getline_notsup;
-		fs->printf = __fstream_printf;
+		fstr->fstr_flush = __fstream_flush;
+		fstr->fstr_getline = __fstream_getline_notsup;
+		fstr->fstr_printf = __fstream_printf;
 	} else {
 		WT_ASSERT(session, LF_ISSET(WT_STREAM_READ));
-		fs->flush = __fstream_flush_notsup;
-		fs->getline = __fstream_getline;
-		fs->printf = __fstream_printf_notsup;
+		fstr->fstr_flush = __fstream_flush_notsup;
+		fstr->fstr_getline = __fstream_getline;
+		fstr->fstr_printf = __fstream_printf_notsup;
 	}
-	*fsp = fs;
+	*fstrp = fstr;
 	return (0);
 
 err:	WT_TRET(__wt_close(session, &fh));
-	__wt_free(session, fs);
+	__wt_free(session, fstr);
 	return (ret);
 }
diff --git a/src/os_common/os_fstream_stdio.c b/src/os_common/os_fstream_stdio.c
index 4b0c761024b..eea2c80ff0e 100644
--- a/src/os_common/os_fstream_stdio.c
+++ b/src/os_common/os_fstream_stdio.c
@@ -65,9 +65,9 @@ __stdio_init(WT_FSTREAM *fs, const char *name, FILE *fp)
 	fs->fp = fp;
 
 	fs->close = __stdio_close;
-	fs->flush = __stdio_flush;
-	fs->getline = __stdio_getline;
-	fs->printf = __stdio_printf;
+	fs->fstr_flush = __stdio_flush;
+	fs->fstr_getline = __stdio_getline;
+	fs->fstr_printf = __stdio_printf;
 }
 
 /*
diff --git a/src/os_posix/os_fallocate.c b/src/os_posix/os_fallocate.c
index a162dbe01a1..9e5d9519900 100644
--- a/src/os_posix/os_fallocate.c
+++ b/src/os_posix/os_fallocate.c
@@ -125,28 +125,28 @@ __wt_posix_file_fallocate(WT_FILE_HANDLE *file_handle,
 	 * avoid locking on Linux if at all possible.
 	 */
 	if (__posix_std_fallocate(file_handle, wt_session, offset, len) == 0) {
-		file_handle->fallocate_nolock = __posix_std_fallocate;
-		WT_PUBLISH(file_handle->fallocate, NULL);
+		file_handle->fh_allocate_nolock = __posix_std_fallocate;
+		WT_PUBLISH(file_handle->fh_allocate, NULL);
 		return (0);
 	}
 	if (__posix_sys_fallocate(file_handle, wt_session, offset, len) == 0) {
-		file_handle->fallocate_nolock = __posix_sys_fallocate;
-		WT_PUBLISH(file_handle->fallocate, NULL);
+		file_handle->fh_allocate_nolock = __posix_sys_fallocate;
+		WT_PUBLISH(file_handle->fh_allocate, NULL);
 		return (0);
 	}
 	if (__posix_posix_fallocate(
 	    file_handle, wt_session, offset, len) == 0) {
 #if defined(__linux__)
-		file_handle->fallocate = __posix_posix_fallocate;
+		file_handle->fh_allocate = __posix_posix_fallocate;
 		WT_WRITE_BARRIER();
 #else
-		file_handle->fallocate_nolock = __posix_posix_fallocate;
-		WT_PUBLISH(file_handle->fallocate, NULL);
+		file_handle->fh_allocate_nolock = __posix_posix_fallocate;
+		WT_PUBLISH(file_handle->fh_allocate, NULL);
 #endif
 		return (0);
 	}
 
-	file_handle->fallocate = NULL;
+	file_handle->fh_allocate = NULL;
 	WT_WRITE_BARRIER();
 	return (ENOTSUP);
 }
diff --git a/src/os_posix/os_fs.c b/src/os_posix/os_fs.c
index 5565076d586..c05f75f2bd5 100644
--- a/src/os_posix/os_fs.c
+++ b/src/os_posix/os_fs.c
@@ -228,7 +228,7 @@ __posix_file_advise(WT_FILE_HANDLE *file_handle, WT_SESSION *wt_session,
 	 * handle method to prevent future calls.
 	 */
 	if (ret == EINVAL) {
-		file_handle->fadvise = NULL;
+		file_handle->fh_advise = NULL;
 		return (ENOTSUP);
 	}
 
@@ -623,31 +623,31 @@ __posix_open_file(WT_FILE_SYSTEM *file_system, WT_SESSION *wt_session,
 	 * interesting.
 	 */
 	if (!pfh->direct_io)
-		file_handle->fadvise = __posix_file_advise;
+		file_handle->fh_advise = __posix_file_advise;
 #endif
-	file_handle->fallocate = __wt_posix_file_fallocate;
-	file_handle->lock = __posix_file_lock;
+	file_handle->fh_allocate = __wt_posix_file_fallocate;
+	file_handle->fh_lock = __posix_file_lock;
 #ifdef WORDS_BIGENDIAN
 	/*
 	 * The underlying objects are little-endian, mapping objects isn't
 	 * currently supported on big-endian systems.
 	 */
 #else
-	file_handle->map = __wt_posix_map;
+	file_handle->fh_map = __wt_posix_map;
 #ifdef HAVE_POSIX_MADVISE
-	file_handle->map_discard = __wt_posix_map_discard;
-	file_handle->map_preload = __wt_posix_map_preload;
+	file_handle->fh_map_discard = __wt_posix_map_discard;
+	file_handle->fh_map_preload = __wt_posix_map_preload;
 #endif
-	file_handle->unmap = __wt_posix_unmap;
+	file_handle->fh_unmap = __wt_posix_unmap;
 #endif
-	file_handle->read = __posix_file_read;
-	file_handle->size = __posix_file_size;
-	file_handle->sync = __posix_file_sync;
+	file_handle->fh_read = __posix_file_read;
+	file_handle->fh_size = __posix_file_size;
+	file_handle->fh_sync = __posix_file_sync;
 #ifdef HAVE_SYNC_FILE_RANGE
-	file_handle->sync_nowait = __posix_file_sync_nowait;
+	file_handle->fh_sync_nowait = __posix_file_sync_nowait;
 #endif
-	file_handle->truncate = __posix_file_truncate;
-	file_handle->write = __posix_file_write;
+	file_handle->fh_truncate = __posix_file_truncate;
+	file_handle->fh_write = __posix_file_write;
 
 	*file_handlep = file_handle;
 
@@ -689,16 +689,16 @@ __wt_os_posix(WT_SESSION_IMPL *session)
 	WT_RET(__wt_calloc_one(session, &file_system));
 
 	/* Initialize the POSIX jump table. */
-	file_system->directory_list = __wt_posix_directory_list;
-	file_system->directory_list_free = __wt_posix_directory_list_free;
+	file_system->fs_directory_list = __wt_posix_directory_list;
+	file_system->fs_directory_list_free = __wt_posix_directory_list_free;
 #ifdef __linux__
-	file_system->directory_sync = __posix_directory_sync;
+	file_system->fs_directory_sync = __posix_directory_sync;
 #endif
-	file_system->exist = __posix_fs_exist;
-	file_system->open_file = __posix_open_file;
-	file_system->remove = __posix_fs_remove;
-	file_system->rename = __posix_fs_rename;
-	file_system->size = __posix_fs_size;
+	file_system->fs_exist = __posix_fs_exist;
+	file_system->fs_open_file = __posix_open_file;
+	file_system->fs_remove = __posix_fs_remove;
+	file_system->fs_rename = __posix_fs_rename;
+	file_system->fs_size = __posix_fs_size;
 	file_system->terminate = __posix_terminate;
 
 	/* Switch it into place. */
diff --git a/src/os_posix/os_map.c b/src/os_posix/os_map.c
index 7fde4037250..9cdb58b95c8 100644
--- a/src/os_posix/os_map.c
+++ b/src/os_posix/os_map.c
@@ -40,7 +40,7 @@ __wt_posix_map(WT_FILE_HANDLE *fh, WT_SESSION *wt_session,
 	 * underneath us, our caller needs to ensure consistency of the mapped
 	 * region vs. any other file activity.
 	 */
-	WT_RET(fh->size(fh, wt_session, &file_size));
+	WT_RET(fh->fh_size(fh, wt_session, &file_size));
 	len = (size_t)file_size;
 
 	(void)__wt_verbose(session, WT_VERB_HANDLEOPS,
diff --git a/src/os_win/os_fs.c b/src/os_win/os_fs.c
index 33e281bf8ae..c4a1235b61b 100644
--- a/src/os_win/os_fs.c
+++ b/src/os_win/os_fs.c
@@ -498,21 +498,21 @@ __win_open_file(WT_FILE_SYSTEM *file_system, WT_SESSION *wt_session,
 	WT_ERR(__wt_strdup(session, name, &file_handle->name));
 
 	file_handle->close = __win_file_close;
-	file_handle->lock = __win_file_lock;
+	file_handle->fh_lock = __win_file_lock;
 #ifdef WORDS_BIGENDIAN
 	/*
 	 * The underlying objects are little-endian, mapping objects isn't
 	 * currently supported on big-endian systems.
 	 */
 #else
-	file_handle->map = __wt_win_map;
-	file_handle->unmap = __wt_win_unmap;
+	file_handle->fh_map = __wt_win_map;
+	file_handle->fh_unmap = __wt_win_unmap;
 #endif
-	file_handle->read = __win_file_read;
-	file_handle->size = __win_file_size;
-	file_handle->sync = __win_file_sync;
-	file_handle->truncate = __win_file_truncate;
-	file_handle->write = __win_file_write;
+	file_handle->fh_read = __win_file_read;
+	file_handle->fh_size = __win_file_size;
+	file_handle->fh_sync = __win_file_sync;
+	file_handle->fh_truncate = __win_file_truncate;
+	file_handle->fh_write = __win_file_write;
 
 	*file_handlep = file_handle;
 
@@ -552,13 +552,13 @@ __wt_os_win(WT_SESSION_IMPL *session)
 	WT_RET(__wt_calloc_one(session, &file_system));
 
 	/* Initialize the Windows jump table. */
-	file_system->directory_list = __wt_win_directory_list;
-	file_system->directory_list_free = __wt_win_directory_list_free;
-	file_system->exist = __win_fs_exist;
-	file_system->open_file = __win_open_file;
-	file_system->remove = __win_fs_remove;
-	file_system->rename = __win_fs_rename;
-	file_system->size = __wt_win_fs_size;
+	file_system->fs_directory_list = __wt_win_directory_list;
+	file_system->fs_directory_list_free = __wt_win_directory_list_free;
+	file_system->fs_exist = __win_fs_exist;
+	file_system->fs_open_file = __win_open_file;
+	file_system->fs_remove = __win_fs_remove;
+	file_system->fs_rename = __win_fs_rename;
+	file_system->fs_size = __wt_win_fs_size;
 	file_system->terminate = __win_terminate;
 
 	/* Switch it into place. */