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/log.h | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 fs/gfs2/log.h (limited to 'fs/gfs2/log.h') diff --git a/fs/gfs2/log.h b/fs/gfs2/log.h new file mode 100644 index 000000000..10beda624 --- /dev/null +++ b/fs/gfs2/log.h @@ -0,0 +1,63 @@ +/* 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 __LOG_DOT_H__ +#define __LOG_DOT_H__ + +#include +#include +#include +#include "incore.h" +#include "inode.h" + +/* + * The minimum amount of log space required for a log flush is one block for + * revokes and one block for the log header. Log flushes other than + * GFS2_LOG_HEAD_FLUSH_NORMAL may write one or two more log headers. + */ +#define GFS2_LOG_FLUSH_MIN_BLOCKS 4 + +static inline void gfs2_ordered_add_inode(struct gfs2_inode *ip) +{ + struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); + + if (gfs2_is_jdata(ip) || !gfs2_is_ordered(sdp)) + return; + + if (list_empty(&ip->i_ordered)) { + spin_lock(&sdp->sd_ordered_lock); + if (list_empty(&ip->i_ordered)) + list_add(&ip->i_ordered, &sdp->sd_log_ordered); + spin_unlock(&sdp->sd_ordered_lock); + } +} + +void gfs2_ordered_del_inode(struct gfs2_inode *ip); +unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct); +bool gfs2_log_is_empty(struct gfs2_sbd *sdp); +void gfs2_log_release_revokes(struct gfs2_sbd *sdp, unsigned int revokes); +void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks); +bool gfs2_log_try_reserve(struct gfs2_sbd *sdp, struct gfs2_trans *tr, + unsigned int *extra_revokes); +void gfs2_log_reserve(struct gfs2_sbd *sdp, struct gfs2_trans *tr, + unsigned int *extra_revokes); +void gfs2_write_log_header(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd, + u64 seq, u32 tail, u32 lblock, u32 flags, + blk_opf_t op_flags); +void gfs2_remove_from_journal(struct buffer_head *bh, int meta); +void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, + u32 type); +void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *trans); +void gfs2_ail1_flush(struct gfs2_sbd *sdp, struct writeback_control *wbc); +void log_flush_wait(struct gfs2_sbd *sdp); + +int gfs2_logd(void *data); +void gfs2_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd); +void gfs2_glock_remove_revoke(struct gfs2_glock *gl); +void gfs2_flush_revokes(struct gfs2_sbd *sdp); +void gfs2_ail_drain(struct gfs2_sbd *sdp); + +#endif /* __LOG_DOT_H__ */ -- cgit v1.3.1