Commit e400be67 authored by Sung-hun Kim's avatar Sung-hun Kim Committed by Steven Rostedt (Google)
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tracing: Make splice_read available again 

Since the commit 36e2c742 ("fs: don't allow splice read/write
without explicit ops") is applied to the kernel, splice() and
sendfile() calls on the trace file (/sys/kernel/debug/tracing
/trace) return EINVAL.

This patch restores these system calls by initializing splice_read
in file_operations of the trace file. This patch only enables such
functionalities for the read case.

Link: https://lore.kernel.org/linux-trace-kernel/20230314013707.28814-1-sfoon.kim@samsung.com



Cc: stable@vger.kernel.org
Fixes: 36e2c742 ("fs: don't allow splice read/write without explicit ops")
Signed-off-by: default avatarSung-hun Kim <sfoon.kim@samsung.com>
Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
parent 87325655

kernel/trace/trace.c

+2 −0
Original line number Diff line number Diff line
@@ -5164,6 +5164,8 @@ loff_t tracing_lseek(struct file *file, loff_t offset, int whence) 
static const struct file_operations tracing_fops = {

	.open		= tracing_open,

	.read		= seq_read,

	.read_iter	= seq_read_iter,

	.splice_read	= generic_file_splice_read,

	.write		= tracing_write_stub,

	.llseek		= tracing_lseek,

	.release	= tracing_release,