* FUSE_DAX_FMAP flag in INIT request/reply
* fuse_conn->famfs_iomap (enable famfs-mapped files) to denote a
famfs-enabled connection
Signed-off-by: John Groves <john@xxxxxxxxxx>
---
fs/fuse/fuse_i.h | 3 +++
fs/fuse/inode.c | 5 +++++
include/uapi/linux/fuse.h | 2 ++
3 files changed, 10 insertions(+)
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index e04d160fa995..b2c563b1a1c8 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -870,6 +870,9 @@ struct fuse_conn {
/* Use io_uring for communication */
unsigned int io_uring;
+ /* dev_dax_iomap support for famfs */
+ unsigned int famfs_iomap:1;
+
/** Maximum stack depth for passthrough backing files */
int max_stack_depth;
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 29147657a99f..5c6947b12503 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -1392,6 +1392,9 @@ static void process_init_reply(struct fuse_mount *fm, struct fuse_args *args,
}
if (flags & FUSE_OVER_IO_URING && fuse_uring_enabled())
fc->io_uring = 1;
+ if (IS_ENABLED(CONFIG_FUSE_FAMFS_DAX) &&
+ flags & FUSE_DAX_FMAP)
+ fc->famfs_iomap = 1;
} else {
ra_pages = fc->max_read / PAGE_SIZE;
fc->no_lock = 1;
@@ -1450,6 +1453,8 @@ void fuse_send_init(struct fuse_mount *fm)
flags |= FUSE_SUBMOUNTS;
if (IS_ENABLED(CONFIG_FUSE_PASSTHROUGH))
flags |= FUSE_PASSTHROUGH;
+ if (IS_ENABLED(CONFIG_FUSE_FAMFS_DAX))
+ flags |= FUSE_DAX_FMAP;
/*
* This is just an information flag for fuse server. No need to check
diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h
index 5e0eb41d967e..f9e14180367a 100644
--- a/include/uapi/linux/fuse.h
+++ b/include/uapi/linux/fuse.h
@@ -435,6 +435,7 @@ struct fuse_file_lock {
* of the request ID indicates resend requests
* FUSE_ALLOW_IDMAP: allow creation of idmapped mounts
* FUSE_OVER_IO_URING: Indicate that client supports io-uring
+ * FUSE_DAX_FMAP: kernel supports dev_dax_iomap (aka famfs) fmaps
*/
#define FUSE_ASYNC_READ (1 << 0)
#define FUSE_POSIX_LOCKS (1 << 1)
@@ -482,6 +483,7 @@ struct fuse_file_lock {
#define FUSE_DIRECT_IO_RELAX FUSE_DIRECT_IO_ALLOW_MMAP
#define FUSE_ALLOW_IDMAP (1ULL << 40)
#define FUSE_OVER_IO_URING (1ULL << 41)
+#define FUSE_DAX_FMAP (1ULL << 42)
/**
* CUSE INIT request/reply flags
--
2.49.0
