[PATCH 13/19] fuse2fs: set iomap-related inode flags

Darrick J. Wong
2025-08-21T01:19:06Z

Set FUSE_IFLAG_* when we do a getattr, so that all files will have iomap
enabled.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
---
misc/fuse2fs.c | 20 ++++++++++++++++++++
misc/fuse4fs.c | 46 +++++++++++++++++++++++++++++++++++-----------
2 files changed, 55 insertions(+), 11 deletions(-)

diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c
index fc83d2d21c600b..291416afb93d6c 100644
--- a/misc/fuse2fs.c
+++ b/misc/fuse2fs.c
@@ -1620,6 +1620,23 @@ static int op_getattr(const char *path, struct stat *statbuf
return ret;
}

+#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 99)
+static int op_getattr_iflags(const char *path, struct stat *statbuf,
+ unsigned int *iflags, struct fuse_file_info *fi)
+{
+ int ret = op_getattr(path, statbuf, fi);
+
+ if (ret)
+ return ret;
+
+ if (fuse_fs_can_enable_iomap(statbuf))
+ *iflags |= FUSE_IFLAG_IOMAP;
+
+ return 0;
+}
+#endif
+
+
static int op_readlink(const char *path, char *buf, size_t len)
{
struct fuse2fs *ff = fuse2fs_get();
@@ -6339,6 +6356,9 @@ static struct fuse_operations fs_ops = {
.fallocate = op_fallocate,
# endif
#endif
+#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 99)
+ .getattr_iflags = op_getattr_iflags,
+#endif
#ifdef HAVE_FUSE_IOMAP
.iomap_begin = op_iomap_begin,
.iomap_end = op_iomap_end,
diff --git a/misc/fuse4fs.c b/misc/fuse4fs.c
index 6de9f69d05de0b..37a7ab3a3718e4 100644
--- a/misc/fuse4fs.c
+++ b/misc/fuse4fs.c
@@ -1659,6 +1659,7 @@ static void op_init(void *userdata, struct fuse_conn_info *conn)

struct fuse4fs_stat {
struct fuse_entry_param entry;
+ unsigned int iflags;
};

static int fuse4fs_stat_inode(struct fuse4fs *ff, ext2_ino_t ino,
@@ -1724,9 +1725,29 @@ static int fuse4fs_stat_inode(struct fuse4fs *ff, ext2_ino_t ino,
entry->attr_timeout = FUSE4FS_ATTR_TIMEOUT;
entry->entry_timeout = FUSE4FS_ATTR_TIMEOUT;

+ fstat->iflags = 0;
+#ifdef HAVE_FUSE_IOMAP
+ if (fuse4fs_iomap_enabled(ff))
+ fstat->iflags |= FUSE_IFLAG_IOMAP;
+#endif
+
return 0;
}

+#if FUSE_VERSION < FUSE_MAKE_VERSION(3, 99)
+#define fuse_reply_entry_iflags(req, entry, iflags) \
+ fuse_reply_entry((req), (entry))
+
+#define fuse_reply_attr_iflags(req, entry, iflags, timeout) \
+ fuse_reply_attr((req), (entry), (timeout))
+
+#define fuse_add_direntry_plus_iflags(req, buf, sz, name, iflags, entry, dirpos) \
+ fuse_add_direntry_plus((req), (buf), (sz), (name), (entry), (dirpos))
+
+#define fuse_reply_create_iflags(req, entry, iflags, fp) \
+ fuse_reply_create((req), (entry), (fp))
+#endif
+
static void op_lookup(fuse_req_t req, fuse_ino_t fino, const char *name)
{
struct fuse4fs_stat fstat;
@@ -1757,7 +1778,7 @@ static void op_lookup(fuse_req_t req, fuse_ino_t fino, const char *name)
if (ret)
fuse_reply_err(req, -ret);
else
- fuse_reply_entry(req, &fstat.entry);
+ fuse_reply_entry_iflags(req, &fstat.entry, fstat.iflags);
}

static void op_getattr(fuse_req_t req, fuse_ino_t fino,
@@ -1777,8 +1798,8 @@ static void op_getattr(fuse_req_t req, fuse_ino_t fino,
if (ret)
fuse_reply_err(req, -ret);
else
- fuse_reply_attr(req, &fstat.entry.attr,
- fstat.entry.attr_timeout);
+ fuse_reply_attr_iflags(req, &fstat.entry.attr, fstat.iflags,
+ fstat.entry.attr_timeout);
}

static void op_readlink(fuse_req_t req, fuse_ino_t fino)
@@ -2056,7 +2077,7 @@ static void fuse4fs_reply_entry(fuse_req_t req, ext2_ino_t ino,
return;
}

- fuse_reply_entry(req, &fstat.entry);
+ fuse_reply_entry_iflags(req, &fstat.entry, fstat.iflags);
}

static void op_mknod(fuse_req_t req, fuse_ino_t fino, const char *name,
@@ -4317,10 +4338,13 @@ static int op_readdir_iter(ext2_ino_t dir EXT2FS_ATTR((unused)),
namebuf[dirent->name_len & 0xFF] = 0;

if (i->readdirplus) {
- entrysize = fuse_add_direntry_plus(i->req, i->buf + i->bufused,
- i->bufsz - i->bufused,
- namebuf, &fstat.entry,
- i->dirpos);
+ entrysize = fuse_add_direntry_plus_iflags(i->req,
+ i->buf + i->bufused,
+ i->bufsz - i->bufused,
+ namebuf,
+ fstat.iflags,
+ &fstat.entry,
+ i->dirpos);
} else {
entrysize = fuse_add_direntry(i->req, i->buf + i->bufused,
i->bufsz - i->bufused, namebuf,
@@ -4545,7 +4569,7 @@ static void op_create(fuse_req_t req, fuse_ino_t fino, const char *name,
if (ret)
fuse_reply_err(req, -ret);
else
- fuse_reply_create(req, &fstat.entry, fp);
+ fuse_reply_create_iflags(req, &fstat.entry, fstat.iflags, fp);
}

#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 17)
@@ -4744,8 +4768,8 @@ static void op_setattr(fuse_req_t req, fuse_ino_t fino, struct stat *attr,
if (ret)
fuse_reply_err(req, -ret);
else
- fuse_reply_attr(req, &fstat.entry.attr,
- fstat.entry.attr_timeout);
+ fuse_reply_attr_iflags(req, &fstat.entry.attr, fstat.iflags,
+ fstat.entry.attr_timeout);
}

#define FUSE4FS_MODIFIABLE_IFLAGS \