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/btrfs/delalloc-space.h | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 fs/btrfs/delalloc-space.h (limited to 'fs/btrfs/delalloc-space.h') diff --git a/fs/btrfs/delalloc-space.h b/fs/btrfs/delalloc-space.h new file mode 100644 index 000000000..6119c0d3f --- /dev/null +++ b/fs/btrfs/delalloc-space.h @@ -0,0 +1,31 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef BTRFS_DELALLOC_SPACE_H +#define BTRFS_DELALLOC_SPACE_H + +#include + +struct extent_changeset; +struct btrfs_inode; +struct btrfs_fs_info; + +int btrfs_alloc_data_chunk_ondemand(const struct btrfs_inode *inode, u64 bytes); +int btrfs_check_data_free_space(struct btrfs_inode *inode, + struct extent_changeset **reserved, u64 start, u64 len, + bool noflush); +void btrfs_free_reserved_data_space(struct btrfs_inode *inode, + struct extent_changeset *reserved, u64 start, u64 len); +void btrfs_delalloc_release_space(struct btrfs_inode *inode, + struct extent_changeset *reserved, + u64 start, u64 len, bool qgroup_free); +void btrfs_free_reserved_data_space_noquota(struct btrfs_inode *inode, u64 len); +void btrfs_delalloc_release_metadata(struct btrfs_inode *inode, u64 num_bytes, + bool qgroup_free); +int btrfs_delalloc_reserve_space(struct btrfs_inode *inode, + struct extent_changeset **reserved, u64 start, u64 len); +int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes, + u64 disk_num_bytes, bool noflush); +void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes); +void btrfs_delalloc_shrink_extents(struct btrfs_inode *inode, u64 reserved_len, u64 new_len); + +#endif /* BTRFS_DELALLOC_SPACE_H */ -- cgit v1.3.1