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| author |   Sung-hun Kim <sfoon.kim@samsung.com> | 2023-03-14 10:37:07 +0900 |
|---|---|---|
| committer |   Steven Rostedt (Google) <rostedt@goodmis.org> | 2023-03-19 13:16:21 -0400 |
| commit | e400be674a1a40e9dcb2e95f84d6c1fd2d88f31d (patch) | |
| tree | 72c1c5db82a8bbc9fc2cedaf7c387dbfcd214cfe | |
| parent | ftrace: Set direct_ops storage-class-specifier to static (diff) | |
| download | linux-stable-e400be674a1a40e9dcb2e95f84d6c1fd2d88f31d.tar.xz linux-stable-e400be674a1a40e9dcb2e95f84d6c1fd2d88f31d.zip | |
tracing: Make splice_read available again
Since the commit 36e2c7421f02 ("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: 36e2c7421f02 ("fs: don't allow splice read/write without explicit ops")
Signed-off-by: Sung-hun Kim <sfoon.kim@samsung.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
| -rw-r--r-- | kernel/trace/trace.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index fbb602a8b64b..4e9a7a952025 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -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, |