linux-kernel - [PATCH] fuse: add FOPEN_INVAL

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Date:   Wed,  8 Jun 2022 18:42:02 +0800
From:   Jiachen Zhang <zhangjiachen.jaycee@...edance.com>
To:     miklos@...redi.hu
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiachen Zhang <zhangjiachen.jaycee@...edance.com>
Subject: [PATCH] fuse: add FOPEN_INVAL_ATTR

So that the fuse daemon can ask kernel to invalidate the attr cache on file
open.

Signed-off-by: Jiachen Zhang <zhangjiachen.jaycee@...edance.com>
---
 fs/fuse/file.c            | 4 ++++
 include/uapi/linux/fuse.h | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index fdcec3aa7830..9609d13ec351 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -213,6 +213,10 @@ void fuse_finish_open(struct inode *inode, struct file *file)
 		file_update_time(file);
 		fuse_invalidate_attr_mask(inode, FUSE_STATX_MODSIZE);
 	}
+
+	if (ff->open_flags & FOPEN_INVAL_ATTR)
+		fuse_invalidate_attr(inode);
+
 	if ((file->f_mode & FMODE_WRITE) && fc->writeback_cache)
 		fuse_link_write_file(file);
 }
diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h
index d6ccee961891..0b0b7d308ddb 100644
--- a/include/uapi/linux/fuse.h
+++ b/include/uapi/linux/fuse.h
@@ -301,6 +301,7 @@ struct fuse_file_lock {
  * FOPEN_CACHE_DIR: allow caching this directory
  * FOPEN_STREAM: the file is stream-like (no file position at all)
  * FOPEN_NOFLUSH: don't flush data cache on close (unless FUSE_WRITEBACK_CACHE)
+ * FOPEN_INVAL_ATTR: invalidate the attr cache on open
  */
 #define FOPEN_DIRECT_IO		(1 << 0)
 #define FOPEN_KEEP_CACHE	(1 << 1)
@@ -308,6 +309,7 @@ struct fuse_file_lock {
 #define FOPEN_CACHE_DIR		(1 << 3)
 #define FOPEN_STREAM		(1 << 4)
 #define FOPEN_NOFLUSH		(1 << 5)
+#define FOPEN_INVAL_ATTR	(1 << 6)
 
 /**
  * INIT request/reply flags
-- 
2.20.1