linux-ext4 - [PATCH 4/6] fuse2fs: enable caching IO manager

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Message-ID: <176169818834.1431012.15366269956408461432.stgit@frogsfrogsfrogs>
Date: Tue, 28 Oct 2025 18:18:05 -0700
From: "Darrick J. Wong" <djwong@...nel.org>
To: tytso@....edu
Cc: linux-fsdevel@...r.kernel.org, joannelkoong@...il.com, bernd@...ernd.com,
 neal@...pa.dev, miklos@...redi.hu, linux-ext4@...r.kernel.org
Subject: [PATCH 4/6] fuse2fs: enable caching IO manager

From: Darrick J. Wong <djwong@...nel.org>

Enable the new dynamic iocache I/O manager in the fuse server, and turn
off all the other cache control.

Signed-off-by: "Darrick J. Wong" <djwong@...nel.org>
---
 fuse4fs/Makefile.in |    3 ++-
 fuse4fs/fuse4fs.c   |    4 +++-
 misc/Makefile.in    |    4 +++-
 misc/fuse2fs.c      |    6 +++++-
 4 files changed, 13 insertions(+), 4 deletions(-)


diff --git a/fuse4fs/Makefile.in b/fuse4fs/Makefile.in
index 9f3547c271638f..0a558da23ced81 100644
--- a/fuse4fs/Makefile.in
+++ b/fuse4fs/Makefile.in
@@ -147,7 +147,8 @@ fuse4fs.o: $(srcdir)/fuse4fs.c $(top_builddir)/lib/config.h \
  $(top_srcdir)/lib/ext2fs/bitops.h $(top_srcdir)/lib/ext2fs/ext2fsP.h \
  $(top_srcdir)/lib/ext2fs/ext2fs.h $(top_srcdir)/version.h \
  $(top_srcdir)/lib/e2p/e2p.h $(top_srcdir)/lib/support/cache.h \
- $(top_srcdir)/lib/support/list.h $(top_srcdir)/lib/support/xbitops.h
+ $(top_srcdir)/lib/support/list.h $(top_srcdir)/lib/support/xbitops.h \
+ $(top_srcdir)/lib/support/iocache.h
 journal.o: $(srcdir)/../debugfs/journal.c $(top_builddir)/lib/config.h \
  $(top_builddir)/lib/dirpaths.h $(srcdir)/../debugfs/journal.h \
  $(top_srcdir)/e2fsck/jfs_user.h $(top_srcdir)/e2fsck/e2fsck.h \
diff --git a/fuse4fs/fuse4fs.c b/fuse4fs/fuse4fs.c
index ef73013aa8fcb1..e000fc4195ab59 100644
--- a/fuse4fs/fuse4fs.c
+++ b/fuse4fs/fuse4fs.c
@@ -56,6 +56,7 @@
 #include "support/bthread.h"
 #include "support/list.h"
 #include "support/cache.h"
+#include "support/iocache.h"
 
 #include "../version.h"
 #include "uuid/uuid.h"
@@ -1575,6 +1576,7 @@ static errcode_t fuse4fs_open(struct fuse4fs *ff)
 		flags |= EXT2_FLAG_DIRECT_IO;
 
 	dbg_printf(ff, "opening with flags=0x%x\n", flags);
+	iocache_set_backing_manager(unix_io_manager);
 
 	err = fuse4fs_try_losetup(ff, flags);
 	if (err)
@@ -1612,7 +1614,7 @@ static errcode_t fuse4fs_open(struct fuse4fs *ff)
 	deadline = init_deadline(FUSE4FS_OPEN_TIMEOUT);
 	do {
 		err = ext2fs_open2(fuse4fs_device(ff), options, flags, 0, 0,
-				   unix_io_manager, &ff->fs);
+				   iocache_io_manager, &ff->fs);
 		if ((err == EPERM || err == EACCES) &&
 		    (!ff->ro || (flags & EXT2_FLAG_RW))) {
 			/*
diff --git a/misc/Makefile.in b/misc/Makefile.in
index ec964688acd623..8a3adc70fb736e 100644
--- a/misc/Makefile.in
+++ b/misc/Makefile.in
@@ -880,7 +880,9 @@ fuse2fs.o: $(srcdir)/fuse2fs.c $(top_builddir)/lib/config.h \
  $(top_srcdir)/lib/ext2fs/ext2_ext_attr.h $(top_srcdir)/lib/ext2fs/hashmap.h \
  $(top_srcdir)/lib/ext2fs/bitops.h $(top_srcdir)/lib/ext2fs/ext2fsP.h \
  $(top_srcdir)/lib/ext2fs/ext2fs.h $(top_srcdir)/version.h \
- $(top_srcdir)/lib/e2p/e2p.h
+ $(top_srcdir)/lib/e2p/e2p.h $(top_srcdir)/lib/support/cache.h \
+ $(top_srcdir)/lib/support/list.h $(top_srcdir)/lib/support/xbitops.h \
+ $(top_srcdir)/lib/support/iocache.h
 e2fuzz.o: $(srcdir)/e2fuzz.c $(top_builddir)/lib/config.h \
  $(top_builddir)/lib/dirpaths.h $(top_srcdir)/lib/ext2fs/ext2_fs.h \
  $(top_builddir)/lib/ext2fs/ext2_types.h $(top_srcdir)/lib/ext2fs/ext2fs.h \
diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c
index b359e91f7b9e9b..fb31183d4cd895 100644
--- a/misc/fuse2fs.c
+++ b/misc/fuse2fs.c
@@ -53,6 +53,9 @@
 #include "ext2fs/ext2_fs.h"
 #include "ext2fs/ext2fsP.h"
 #include "support/bthread.h"
+#include "support/list.h"
+#include "support/cache.h"
+#include "support/iocache.h"
 
 #include "../version.h"
 #include "uuid/uuid.h"
@@ -1405,6 +1408,7 @@ static errcode_t fuse2fs_open(struct fuse2fs *ff)
 		flags |= EXT2_FLAG_DIRECT_IO;
 
 	dbg_printf(ff, "opening with flags=0x%x\n", flags);
+	iocache_set_backing_manager(unix_io_manager);
 
 	err = fuse2fs_try_losetup(ff, flags);
 	if (err)
@@ -1442,7 +1446,7 @@ static errcode_t fuse2fs_open(struct fuse2fs *ff)
 	deadline = init_deadline(FUSE2FS_OPEN_TIMEOUT);
 	do {
 		err = ext2fs_open2(fuse2fs_device(ff), options, flags, 0, 0,
-				   unix_io_manager, &ff->fs);
+				   iocache_io_manager, &ff->fs);
 		if ((err == EPERM || err == EACCES) &&
 		    (!ff->ro || (flags & EXT2_FLAG_RW))) {
 			/*