linux-kernel - Re: [PATCH v4 05/36] fs: Convert alloc_inode

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Date: Mon, 26 Feb 2024 09:48:46 -0800
From: Suren Baghdasaryan <surenb@...gle.com>
To: Vlastimil Babka <vbabka@...e.cz>
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Subject: Re: [PATCH v4 05/36] fs: Convert alloc_inode_sb() to a macro

On Mon, Feb 26, 2024 at 7:44 AM Vlastimil Babka <vbabka@...e.cz> wrote:
>
> On 2/21/24 20:40, Suren Baghdasaryan wrote:
> > From: Kent Overstreet <kent.overstreet@...ux.dev>
> >
> > We're introducing alloc tagging, which tracks memory allocations by
> > callsite. Converting alloc_inode_sb() to a macro means allocations will
> > be tracked by its caller, which is a bit more useful.
> >
> > Signed-off-by: Kent Overstreet <kent.overstreet@...ux.dev>
> > Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
> > Cc: Alexander Viro <viro@...iv.linux.org.uk>
> > Reviewed-by: Kees Cook <keescook@...omium.org>
> > ---
> >  include/linux/fs.h | 6 +-----
> >  1 file changed, 1 insertion(+), 5 deletions(-)
> >
> > diff --git a/include/linux/fs.h b/include/linux/fs.h
> > index 023f37c60709..08d8246399c3 100644
> > --- a/include/linux/fs.h
> > +++ b/include/linux/fs.h
> > @@ -3010,11 +3010,7 @@ int setattr_should_drop_sgid(struct mnt_idmap *idmap,
> >   * This must be used for allocating filesystems specific inodes to set
> >   * up the inode reclaim context correctly.
> >   */
> > -static inline void *
> > -alloc_inode_sb(struct super_block *sb, struct kmem_cache *cache, gfp_t gfp)
>
> A __always_inline wouldn't have the same effect? Just wondering.

I think inlining it would still keep __LINE__ and __FILE__ pointing to
this location in the header instead of the location where the call
happens. If we change alloc_inode_sb() to inline we will have to wrap
it with alloc_hook() and call kmem_cache_alloc_lru_noprof() inside it.
Doable but this change seems much simpler.

>
> > -{
> > -     return kmem_cache_alloc_lru(cache, &sb->s_inode_lru, gfp);
> > -}
> > +#define alloc_inode_sb(_sb, _cache, _gfp) kmem_cache_alloc_lru(_cache, &_sb->s_inode_lru, _gfp)
> >
> >  extern void __insert_inode_hash(struct inode *, unsigned long hashval);
> >  static inline void insert_inode_hash(struct inode *inode)
>
> --
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