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/gfs2/util.h | 199 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 199 insertions(+) create mode 100644 fs/gfs2/util.h (limited to 'fs/gfs2/util.h') diff --git a/fs/gfs2/util.h b/fs/gfs2/util.h new file mode 100644 index 000000000..ffcc47d6b --- /dev/null +++ b/fs/gfs2/util.h @@ -0,0 +1,199 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. + * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. + */ + +#ifndef __UTIL_DOT_H__ +#define __UTIL_DOT_H__ + +#ifdef pr_fmt +#undef pr_fmt +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#endif + +#include + +#include "incore.h" + +#define fs_emerg(fs, fmt, ...) \ + pr_emerg("fsid=%s: " fmt, (fs)->sd_fsname, ##__VA_ARGS__) +#define fs_warn(fs, fmt, ...) \ + pr_warn("fsid=%s: " fmt, (fs)->sd_fsname, ##__VA_ARGS__) +#define fs_err(fs, fmt, ...) \ + pr_err("fsid=%s: " fmt, (fs)->sd_fsname, ##__VA_ARGS__) +#define fs_info(fs, fmt, ...) \ + pr_info("fsid=%s: " fmt, (fs)->sd_fsname, ##__VA_ARGS__) + +void gfs2_assert_i(struct gfs2_sbd *sdp); + +#define gfs2_assert(sdp, assertion) \ +do { \ + if (unlikely(!(assertion))) { \ + gfs2_assert_i(sdp); \ + BUG(); \ + } \ +} while (0) + + +void gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion, + const char *function, char *file, unsigned int line); + +#define gfs2_assert_withdraw(sdp, assertion) \ + ({ \ + bool _bool = (assertion); \ + if (unlikely(!_bool)) \ + gfs2_assert_withdraw_i((sdp), #assertion, \ + __func__, __FILE__, __LINE__); \ + !_bool; \ + }) + +void gfs2_assert_warn_i(struct gfs2_sbd *sdp, char *assertion, + const char *function, char *file, unsigned int line); + +#define gfs2_assert_warn(sdp, assertion) \ + ({ \ + bool _bool = (assertion); \ + if (unlikely(!_bool)) \ + gfs2_assert_warn_i((sdp), #assertion, \ + __func__, __FILE__, __LINE__); \ + !_bool; \ + }) + +void gfs2_consist_i(struct gfs2_sbd *sdp, + const char *function, char *file, unsigned int line); + +#define gfs2_consist(sdp) \ +gfs2_consist_i((sdp), __func__, __FILE__, __LINE__) + + +void gfs2_consist_inode_i(struct gfs2_inode *ip, + const char *function, char *file, unsigned int line); + +#define gfs2_consist_inode(ip) \ +gfs2_consist_inode_i((ip), __func__, __FILE__, __LINE__) + + +void gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd, + const char *function, char *file, unsigned int line); + +#define gfs2_consist_rgrpd(rgd) \ +gfs2_consist_rgrpd_i((rgd), __func__, __FILE__, __LINE__) + + +void gfs2_meta_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh, + const char *function, + char *file, unsigned int line); + +static inline int gfs2_meta_check(struct gfs2_sbd *sdp, + struct buffer_head *bh) +{ + struct gfs2_meta_header *mh = (struct gfs2_meta_header *)bh->b_data; + u32 magic = be32_to_cpu(mh->mh_magic); + if (unlikely(magic != GFS2_MAGIC)) { + fs_err(sdp, "Magic number missing at %llu\n", + (unsigned long long)bh->b_blocknr); + return -EIO; + } + return 0; +} + +void gfs2_metatype_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh, + u16 type, u16 t, + const char *function, + char *file, unsigned int line); + +static inline int gfs2_metatype_check_i(struct gfs2_sbd *sdp, + struct buffer_head *bh, + u16 type, + const char *function, + char *file, unsigned int line) +{ + struct gfs2_meta_header *mh = (struct gfs2_meta_header *)bh->b_data; + u32 magic = be32_to_cpu(mh->mh_magic); + u16 t = be32_to_cpu(mh->mh_type); + if (unlikely(magic != GFS2_MAGIC)) { + gfs2_meta_check_ii(sdp, bh, function, + file, line); + return -EIO; + } + if (unlikely(t != type)) { + gfs2_metatype_check_ii(sdp, bh, type, t, function, + file, line); + return -EIO; + } + return 0; +} + +#define gfs2_metatype_check(sdp, bh, type) \ +gfs2_metatype_check_i((sdp), (bh), (type), __func__, __FILE__, __LINE__) + +static inline void gfs2_metatype_set(struct buffer_head *bh, u16 type, + u16 format) +{ + struct gfs2_meta_header *mh; + mh = (struct gfs2_meta_header *)bh->b_data; + mh->mh_type = cpu_to_be32(type); + mh->mh_format = cpu_to_be32(format); +} + + +void gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function, + char *file, unsigned int line); + +int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd, + bool verbose); +int gfs2_freeze_lock_shared(struct gfs2_sbd *sdp); +void gfs2_freeze_unlock(struct gfs2_sbd *sdp); + +#define gfs2_io_error(sdp) \ +gfs2_io_error_i((sdp), __func__, __FILE__, __LINE__) + + +void gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh, + const char *function, char *file, unsigned int line); + +#define gfs2_io_error_bh(sdp, bh) \ +gfs2_io_error_bh_i((sdp), (bh), __func__, __FILE__, __LINE__) + + +extern struct kmem_cache *gfs2_glock_cachep; +extern struct kmem_cache *gfs2_glock_aspace_cachep; +extern struct kmem_cache *gfs2_inode_cachep; +extern struct kmem_cache *gfs2_bufdata_cachep; +extern struct kmem_cache *gfs2_rgrpd_cachep; +extern struct kmem_cache *gfs2_quotad_cachep; +extern struct kmem_cache *gfs2_qadata_cachep; +extern struct kmem_cache *gfs2_trans_cachep; +extern mempool_t *gfs2_page_pool; +extern struct workqueue_struct *gfs2_control_wq; + +static inline unsigned int gfs2_tune_get_i(struct gfs2_tune *gt, + unsigned int *p) +{ + unsigned int x; + spin_lock(>->gt_spin); + x = *p; + spin_unlock(>->gt_spin); + return x; +} + +/** + * gfs2_withdrawn - test whether the file system is withdrawn + * @sdp: the superblock + */ +static inline bool gfs2_withdrawn(struct gfs2_sbd *sdp) +{ + return unlikely(test_bit(SDF_WITHDRAWN, &sdp->sd_flags)); +} + +#define gfs2_tune_get(sdp, field) \ +gfs2_tune_get_i(&(sdp)->sd_tune, &(sdp)->sd_tune.field) + +__printf(2, 3) +void gfs2_lm(struct gfs2_sbd *sdp, const char *fmt, ...); + +void gfs2_withdraw_func(struct work_struct *work); +void gfs2_withdraw(struct gfs2_sbd *sdp); + +#endif /* __UTIL_DOT_H__ */ -- cgit v1.3.1