linux-kernel - Re: [PATCH v5 02/10] eventfs: Implement tracefs_inode

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Date:   Wed, 26 Jul 2023 18:45:34 +0000
From:   Ajay Kaher <akaher@...are.com>
To:     Steven Rostedt <rostedt@...dmis.org>
CC:     "shuah@...nel.org" <shuah@...nel.org>,
        "mhiramat@...nel.org" <mhiramat@...nel.org>,
        Ching-lin Yu <chinglinyu@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "linux-trace-kernel@...r.kernel.org" 
        <linux-trace-kernel@...r.kernel.org>,
        "lkp@...el.com" <lkp@...el.com>, Nadav Amit <namit@...are.com>,
        "oe-lkp@...ts.linux.dev" <oe-lkp@...ts.linux.dev>,
        Alexey Makhalov <amakhalov@...are.com>,
        "er.ajay.kaher@...il.com" <er.ajay.kaher@...il.com>,
        "srivatsa@...il.mit.edu" <srivatsa@...il.mit.edu>,
        Tapas Kundu <tkundu@...are.com>,
        Vasavi Sirnapalli <vsirnapalli@...are.com>
Subject: Re: [PATCH v5 02/10] eventfs: Implement tracefs_inode_cache


>> diff --git a/fs/tracefs/inode.c b/fs/tracefs/inode.c
>> index 57ac8aa4a724..2508944cc4d8 100644
>> --- a/fs/tracefs/inode.c
>> +++ b/fs/tracefs/inode.c
>> @@ -21,13 +21,33 @@
>> #include <linux/parser.h>
>> #include <linux/magic.h>
>> #include <linux/slab.h>
>> +#include "internal.h"
>> 
>> #define TRACEFS_DEFAULT_MODE 0700
>> +static struct kmem_cache *tracefs_inode_cachep __ro_after_init;
>> 
>> static struct vfsmount *tracefs_mount;
>> static int tracefs_mount_count;
>> static bool tracefs_registered;
>> 
>> +static struct inode *tracefs_alloc_inode(struct super_block *sb)
>> +{
>> +     struct tracefs_inode *ti;
>> +
>> +     ti = kmem_cache_alloc(tracefs_inode_cachep, GFP_KERNEL);
>> +     if (!ti)
>> +             return NULL;
>> +
>> +     ti->flags = 0;
>> +
>> +     return &ti->vfs_inode;
>> +}
>> +
>> +static void tracefs_free_inode(struct inode *inode)
>> +{
>> +     kmem_cache_free(tracefs_inode_cachep, get_tracefs(inode));
>> +}
>> +
>> static ssize_t default_read_file(struct file *file, char __user *buf,
>>                               size_t count, loff_t *ppos)
>> {
>> @@ -346,6 +366,9 @@ static int tracefs_show_options(struct seq_file *m, struct dentry *root)
>> }
>> 
>> static const struct super_operations tracefs_super_operations = {
>> +     .alloc_inode    = tracefs_alloc_inode,
>> +     .free_inode     = tracefs_free_inode,
>> +     .drop_inode     = generic_delete_inode,
>>      .statfs         = simple_statfs,
>>      .remount_fs     = tracefs_remount,
>>      .show_options   = tracefs_show_options,
>> @@ -628,10 +651,26 @@ bool tracefs_initialized(void)
>>      return tracefs_registered;
>> }
>> 
>> +static void init_once(void *foo)
>> +{
>> +     struct tracefs_inode *ti = (struct tracefs_inode *) foo;
>> +
>> +     inode_init_once(&ti->vfs_inode);
>> +}
>> +
>> static int __init tracefs_init(void)
>> {
>>      int retval;
>> 
>> +     tracefs_inode_cachep = kmem_cache_create("tracefs_inode_cache",
>> +                                              sizeof(struct tracefs_inode),
>> +                                              0, (SLAB_RECLAIM_ACCOUNT|
>> +                                                  SLAB_MEM_SPREAD|
>> +                                                  SLAB_ACCOUNT),
>> +                                              init_once);
>> +     if (!tracefs_inode_cachep)
>> +             return -ENOMEM;
>> +
>>      retval = sysfs_create_mount_point(kernel_kobj, "tracing");
>>      if (retval)
>>              return -EINVAL;
>> diff --git a/fs/tracefs/internal.h b/fs/tracefs/internal.h
>> new file mode 100644
>> index 000000000000..49b5e8949e1c
>> --- /dev/null
>> +++ b/fs/tracefs/internal.h
>> @@ -0,0 +1,19 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +#ifndef _TRACEFS_INTERNAL_H
>> +#define _TRACEFS_INTERNAL_H
>> +
>> +enum {
>> +     TRACEFS_EVENT_INODE     = BIT(1),
>> +};
> 
> Let's not introduce the enum until it is used.


Ok, I will move this to v6 04/10.
Let me know once you will complete the review of v5.

-Ajay