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Code Issues Releases Wiki Activity

tracefs/eventfs: Use list_for_each_srcu() in dcache_dir_open_wrapper() 

The eventfs files list is protected by SRCU. In earlier iterations it was
protected with just RCU, but because it needed to also call sleepable
code, it had to be switch to SRCU. The dcache_dir_open_wrapper()
list_for_each_rcu() was missed and did not get converted over to
list_for_each_srcu(). That needs to be fixed.

Link: https://lore.kernel.org/linux-trace-kernel/20230911120053.ca82f545e7f46ea753deda18@kernel.org/
Link: https://lore.kernel.org/linux-trace-kernel/20230911200654.71ce927c@gandalf.local.home

Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ajay Kaher <akaher@vmware.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Reported-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Fixes: 6394044955 ("eventfs: Implement eventfs lookup, read, open functions")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Google) 2023-09-11 20:06:54 -04:00
parent 62663b8496
commit 9243e54309
1 changed files with 2 additions and 1 deletions
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3
fs/tracefs/event_inode.c
View File

@ -452,7 +452,8 @@ static int dcache_dir_open_wrapper(struct inode *inode, struct file *file)
ei = ti->private;
idx = srcu_read_lock(&eventfs_srcu);
list_for_each_entry_rcu(ef, &ei->e_top_files, list) {
list_for_each_entry_srcu(ef, &ei->e_top_files, list,
srcu_read_lock_held(&eventfs_srcu)) {
create_dentry(ef, dentry, false);
}
srcu_read_unlock(&eventfs_srcu, idx);