fuse: fix connection abort on mmap when fuse server returns ENOSYS

hbirth · hbirth · commit f6fbf7c7bfb9 · 2025-07-21T18:15:55.000+02:00
Check whether dlm is still enabled when interpreting the returned
error from fuse server.

Signed-off-by: Horst Birthelmer &lt;hbirthelmer@ddn.com&gt;
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
@@ -2247,7 +2247,7 @@ static int fuse_get_page_mkwrite_lock(struct file *file, loff_t offset, size_t l
 		err = 0;
 	}
 
-	if (!err && outarg.locksize < length) {
+	if (!err && fc->dlm && outarg.locksize < length) {
 		/* fuse server is seriously broken */
 		pr_warn("fuse: dlm lock request for %lu bytes returned %u bytes\n",
 			length, outarg.locksize);

Original file line number	Diff line number	Diff line change
`@@ -2247,7 +2247,7 @@ static int fuse_get_page_mkwrite_lock(struct file *file, loff_t offset, size_t l`
`2247`	`2247`	`err = 0;`
`2248`	`2248`	`}`
`2249`	`2249`
`2250`		`- if (!err && outarg.locksize < length) {`
	`2250`	`+ if (!err && fc->dlm && outarg.locksize < length) {`
`2251`	`2251`	`/* fuse server is seriously broken */`
`2252`	`2252`	`pr_warn("fuse: dlm lock request for %lu bytes returned %u bytes\n",`
`2253`	`2253`	`length, outarg.locksize);`