[PATCH 2/2] fuse: Implement O_TMPFILE support

[Chirantan Ekbote <chirantan@xxxxxxxxxxxx>]

Implement support for O_TMPFILE by re-using the existing infrastructure
for mkdir, symlink, mknod, etc. The server should reply to the tmpfile
request by sending a fuse_entry_out describing the newly created
tmpfile.

Signed-off-by: Chirantan Ekbote <chirantan@xxxxxxxxxxxx>
---
 fs/fuse/dir.c  | 21 +++++++++++++++++++++
 fs/fuse/file.c |  3 ++-
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index ff7dbeb16f88d..1ab52e7ec1625 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -751,6 +751,26 @@ static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode)
 	return create_new_entry(fm, &args, dir, entry, S_IFDIR);
 }
 
+static int fuse_tmpfile(struct inode *dir, struct dentry *entry, umode_t mode)
+{
+	struct fuse_tmpfile_in inarg;
+	struct fuse_mount *fm = get_fuse_mount(dir);
+	FUSE_ARGS(args);
+
+	if (!fm->fc->dont_mask)
+		mode &= ~current_umask();
+
+	memset(&inarg, 0, sizeof(inarg));
+	inarg.mode = mode;
+	inarg.umask = current_umask();
+	args.opcode = FUSE_TMPFILE;
+	args.in_numargs = 1;
+	args.in_args[0].size = sizeof(inarg);
+	args.in_args[0].value = &inarg;
+
+	return create_new_entry(fm, &args, dir, entry, S_IFREG);
+}
+
 static int fuse_symlink(struct inode *dir, struct dentry *entry,
 			const char *link)
 {
@@ -1818,6 +1838,7 @@ static const struct inode_operations fuse_dir_inode_operations = {
 	.listxattr	= fuse_listxattr,
 	.get_acl	= fuse_get_acl,
 	.set_acl	= fuse_set_acl,
+	.tmpfile	= fuse_tmpfile,
 };
 
 static const struct file_operations fuse_dir_operations = {
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index c03034e8c1529..8ecf85699a014 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -39,7 +39,8 @@ static int fuse_send_open(struct fuse_mount *fm, u64 nodeid, struct file *file,
 	FUSE_ARGS(args);
 
 	memset(&inarg, 0, sizeof(inarg));
-	inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY);
+	inarg.flags =
+		file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY | O_TMPFILE);
 	if (!fm->fc->atomic_o_trunc)
 		inarg.flags &= ~O_TRUNC;
 	args.opcode = opcode;
-- 
2.29.2.222.g5d2a92d10f8-goog