On Thu, 27 Jul 2000, Alexander Viro wrote:
> On Thu, 27 Jul 2000, Tigran Aivazian wrote:
>
> > Greetings Alexander,
> >
> > I am not sure if you have seen the recent discussion on linux-kernel about
> > Ooopses in kmem_cache_alloc() which may suggest that there are users of
> > getname() before names_cachep is created (due to module_init nature of
> > namecache_init()).
> >
> > Have you given this some thought? I may be missing something obvious
> > (e.g. you may have proved a theorem that _no_ getname() user is possible
> > in principle before do_initcalls() is invoked?).
>
> Not my patch. Yes, such scenarios are possible. I'll try to look through
> that stuff, but it certainly looks like namecache_init() must be moved to
> the group of explicit cache initializations (in kernel/main.c). Linus,
> your opinion?
> Cheers,
> Al
To make this discussion more specific, here is the patch (I haven't heard
back from people who reported these oopses and I only did a _very_ brief
analysis of the problem but the patch seems valid anyway).
diff -urN -X dontdiff linux/init/main.c work/init/main.c
--- linux/init/main.c Thu Jul 27 07:31:21 2000
+++ work/init/main.c Thu Jul 27 21:04:35 2000
@@ -565,6 +565,7 @@
fork_init(mempages);
filescache_init();
dcache_init(mempages);
+ namecache_init();
vma_init();
buffer_init(mempages);
page_cache_init(mempages);
diff -urN -X dontdiff linux/include/linux/fs.h work/include/linux/fs.h
--- linux/include/linux/fs.h Thu Jul 27 07:31:21 2000
+++ work/include/linux/fs.h Thu Jul 27 21:04:06 2000
@@ -195,6 +195,7 @@
extern void inode_init(unsigned long);
extern void file_table_init(void);
extern void dcache_init(unsigned long);
+extern void namecache_init(void);
/* bh state bits */
#define BH_Uptodate 0 /* 1 if the buffer contains valid data */
diff -urN -X dontdiff linux/fs/namei.c work/fs/namei.c
--- linux/fs/namei.c Thu Jul 27 07:31:19 2000
+++ work/fs/namei.c Thu Jul 27 21:04:29 2000
@@ -1958,7 +1958,7 @@
/* SLAB cache for name blocks */
kmem_cache_t *names_cachep;
-static int __init namecache_init(void)
+int __init namecache_init(void)
{
names_cachep = kmem_cache_create("names_cache",
PAGE_SIZE,
@@ -1969,5 +1969,3 @@
panic("Cannot create names cache");
return 0;
}
-
-module_init(namecache_init)
-
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