From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- fs/ntfs/ntfs_codec.h | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 fs/ntfs/ntfs_codec.h (limited to 'fs/ntfs/ntfs_codec.h') diff --git a/fs/ntfs/ntfs_codec.h b/fs/ntfs/ntfs_codec.h new file mode 100644 index 000000000..6030055fb --- /dev/null +++ b/fs/ntfs/ntfs_codec.h @@ -0,0 +1,54 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Transparent compression codec interface. + * + * Copyright (c) 2026 LG Electronics Co., Ltd. + */ + +#ifndef _NTFS_CODEC_H +#define _NTFS_CODEC_H + +#include +#include +#include + +struct compress_context; + +enum ntfs_codec_id { + NTFS_CODEC_LZNT1, +#ifdef CONFIG_NTFS_FS_WOF_COMPRESSION + NTFS_CODEC_XPRESS4K, + NTFS_CODEC_XPRESS8K, + NTFS_CODEC_XPRESS16K, + NTFS_CODEC_LZX32K, +#endif +}; + +struct ntfs_codec_ops { + enum ntfs_codec_id id; + const char *name; + size_t (*scratch_size)(u32 chunk_size); + int (*decompress_chunk)(void *scratch, + const void *src, size_t src_len, + void *dst, size_t dst_len, + u32 chunk_size); + int (*decompress_pages)(struct page *dest_pages[], + int completed_pages[], + int *dest_index, int *dest_ofs, + int dest_max_index, int dest_max_ofs, + int xpage, char *xpage_done, + u8 *cb_start, u32 cb_size, + loff_t i_size, s64 initialized_size); + int (*compress_subblock)(struct compress_context *pctx, + const char *inbuf, int bufsize, char *outbuf); +}; + +extern const struct ntfs_codec_ops ntfs_lznt1_codec_ops; +#ifdef CONFIG_NTFS_FS_WOF_COMPRESSION +extern const struct ntfs_codec_ops ntfs_xpress4k_codec_ops; +extern const struct ntfs_codec_ops ntfs_xpress8k_codec_ops; +extern const struct ntfs_codec_ops ntfs_xpress16k_codec_ops; +extern const struct ntfs_codec_ops ntfs_lzx32k_codec_ops; +#endif + +#endif /* _NTFS_CODEC_H */ -- cgit v1.3.1