linux-ext4 - Re: [patch 1/2] add init_ext4_proc() stub for when CONFIG_PROC

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Date:	Tue, 9 Oct 2007 20:22:05 -0400
From:	Theodore Tso <tytso@....edu>
To:	Mingming Cao <cmm@...ibm.com>
Cc:	Badari Pulavarty <pbadari@...il.com>, markn@....ibm.com,
	ext4 <linux-ext4@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Amit K. Arora" <aarora@...ux.vnet.ibm.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [patch 1/2] add init_ext4_proc() stub for when CONFIG_PROC_FS is not set

On Tue, Oct 09, 2007 at 01:40:12PM -0400, Theodore Tso wrote:
> On Tue, Oct 09, 2007 at 10:03:06AM -0700, Mingming Cao wrote:
> > I guess our testing did not catch this up because we have CONFIG_PROC_FS
> > enabled all the time. mballoc needs procfs for exporting some stats info
> > and tunable paramenters to optimize/customize multiple allocation.
> > 
> > We could select CONFIG_PROC_FS at kconfig when ext4dev is enabled.
> 
> We definitely should be able to compile without CONFIG_PROC_FS; it's a
> major flaw in the mballoc-core.patch that it doesn't work without it.  

I will fold the following into mballoc-core.patch.  It's sufficient to
allow us to compile w/o CONFIG_PROC_FS defined.

							- Ted

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 4409c0c..2305af4 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2854,9 +2854,11 @@ int __init init_ext4_proc(void)
 	if (ext4_pspace_cachep == NULL)
 		return -ENOMEM;
 
+#ifdef CONFIG_PROC_FS
 	proc_root_ext4 = proc_mkdir(EXT4_ROOT, proc_root_fs);
 	if (proc_root_ext4 == NULL)
 		printk(KERN_ERR "EXT4-fs: Unable to create %s\n", EXT4_ROOT);
+#endif
 
 	return 0;
 }
@@ -2865,7 +2867,9 @@ void exit_ext4_proc(void)
 {
 	/* XXX: synchronize_rcu(); */
 	kmem_cache_destroy(ext4_pspace_cachep);
+#ifdef CONFIG_PROC_FS
 	remove_proc_entry(EXT4_ROOT, proc_root_fs);
+#endif
 }
 
 
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