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Message-Id: <20250509-fusectl-backing-files-v3-3-393761f9b683@uniontech.com>
Date: Fri, 09 May 2025 14:33:55 +0800
From: Chen Linxuan via B4 Relay <devnull+chenlinxuan.uniontech.com@...nel.org>
To: Miklos Szeredi <miklos@...redi.hu>
Cc: Amir Goldstein <amir73il@...il.com>, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org, Chen Linxuan <chenlinxuan@...ontech.com>
Subject: [PATCH v3 3/3] fs: fuse: add more information to fdinfo
From: Chen Linxuan <chenlinxuan@...ontech.com>
This commit add fuse connection device id, open_flags and backing
files, to fdinfo of opened fuse files.
Related discussions can be found at links below.
Link: https://lore.kernel.org/all/CAOQ4uxgS3OUy9tpphAJKCQFRAn2zTERXXa0QN_KvP6ZOe2KVBw@mail.gmail.com/
Link: https://lore.kernel.org/all/CAOQ4uxgkg0uOuAWO2wOPNkMmD9wqd5wMX+gTfCT-zVHBC8CkZg@mail.gmail.com/
Cc: Amir Goldstein <amir73il@...il.com>
Signed-off-by: Chen Linxuan <chenlinxuan@...ontech.com>
---
fs/fuse/file.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 754378dd9f7159f20fde6376962d45c4c706b868..1e54965780e9d625918c22a3dea48ba5a9a5ed1b 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -8,6 +8,8 @@
#include "fuse_i.h"
+#include "linux/idr.h"
+#include "linux/rcupdate.h"
#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/kernel.h>
@@ -3392,6 +3394,21 @@ static ssize_t fuse_copy_file_range(struct file *src_file, loff_t src_off,
return ret;
}
+static void fuse_file_show_fdinfo(struct seq_file *seq, struct file *f)
+{
+ struct fuse_file *ff = f->private_data;
+ struct fuse_conn *fc = ff->fm->fc;
+ struct file *backing_file = fuse_file_passthrough(ff);
+
+ seq_printf(seq, "fuse conn:%u open_flags:%u\n", fc->dev, ff->open_flags);
+
+ if (backing_file) {
+ seq_puts(seq, "fuse backing_file: ");
+ seq_file_path(seq, backing_file, " \t\n\\");
+ seq_puts(seq, "\n");
+ }
+}
+
static const struct file_operations fuse_file_operations = {
.llseek = fuse_file_llseek,
.read_iter = fuse_file_read_iter,
@@ -3411,6 +3428,9 @@ static const struct file_operations fuse_file_operations = {
.poll = fuse_file_poll,
.fallocate = fuse_file_fallocate,
.copy_file_range = fuse_copy_file_range,
+#ifdef CONFIG_PROC_FS
+ .show_fdinfo = fuse_file_show_fdinfo,
+#endif
};
static const struct address_space_operations fuse_file_aops = {
--
2.43.0
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