linux-kernel - Re: [PATCH] Documentation: filesystems: updated struct inode

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Message-ID: <20150617085407.69df0468@lwn.net>
Date:	Wed, 17 Jun 2015 08:54:07 -0600
From:	Jonathan Corbet <corbet@....net>
To:	Thomas de Beauchene <thomas.chauvot-de-beauchene@...tech.eu>
Cc:	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Thomas de Beauchene <chauvo_t@...tech.eu>,
	Al Viro <viro@...IV.linux.org.uk>
Subject: Re: [PATCH] Documentation: filesystems: updated struct
 inode_operations documentation in vfs.txt

On Wed, 17 Jun 2015 16:46:35 +0200
Thomas de Beauchene <thomas.chauvot-de-beauchene@...tech.eu> wrote:

> Updated struct inode_operations documentation in vfs.txt to match
> current implementation

Looks good at a first glance, will probably queue it later.  But please be
sure to CC Al Viro (added) on patches like this; he's the expert in this
area.

Thanks,

jon

> Signed-off-by: Thomas de Beauchene <chauvo_t@...tech.eu>
> ---
>  Documentation/filesystems/vfs.txt | 30 +++++++++++++++++++-----------
>  1 file changed, 19 insertions(+), 11 deletions(-)
> 
> diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
> index 3cb2ccf..ff53e34 100644
> --- a/Documentation/filesystems/vfs.txt
> +++ b/Documentation/filesystems/vfs.txt
> @@ -341,11 +341,18 @@ struct inode_operations
>  -----------------------
>  
>  This describes how the VFS can manipulate an inode in your
> -filesystem. As of kernel 2.6.22, the following members are defined:
> +filesystem. As of kernel 4.1, the following members are defined:
>  
>  struct inode_operations {
> -	int (*create) (struct inode *,struct dentry *, umode_t, bool);
>  	struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int);
> +	void * (*follow_link) (struct dentry *, struct nameidata *);
> +	int (*permission) (struct inode *, int);
> +	struct posix_acl * (*get_acl)(struct inode *, int);
> +
> +	int (*readlink) (struct dentry *, char __user *,int);
> +	void (*put_link) (struct dentry *, struct nameidata *, void *);
> +
> +	int (*create) (struct inode *,struct dentry *, umode_t, bool);
>  	int (*link) (struct dentry *,struct inode *,struct dentry *);
>  	int (*unlink) (struct inode *,struct dentry *);
>  	int (*symlink) (struct inode *,struct dentry *,const char *);
> @@ -356,23 +363,24 @@ struct inode_operations {
>  			struct inode *, struct dentry *);
>  	int (*rename2) (struct inode *, struct dentry *,
>  			struct inode *, struct dentry *, unsigned int);
> -	int (*readlink) (struct dentry *, char __user *,int);
> -        void * (*follow_link) (struct dentry *, struct nameidata *);
> -        void (*put_link) (struct dentry *, struct nameidata *, void *);
> -	int (*permission) (struct inode *, int);
> -	int (*get_acl)(struct inode *, int);
>  	int (*setattr) (struct dentry *, struct iattr *);
>  	int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
>  	int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
>  	ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
>  	ssize_t (*listxattr) (struct dentry *, char *, size_t);
>  	int (*removexattr) (struct dentry *, const char *);
> -	void (*update_time)(struct inode *, struct timespec *, int);
> -	int (*atomic_open)(struct inode *, struct dentry *, struct file *,
> -			unsigned open_flag, umode_t create_mode, int *opened);
> +	int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
> +		      u64 len);
> +	int (*update_time)(struct inode *, struct timespec *, int);
> +	int (*atomic_open)(struct inode *, struct dentry *,
> +			   struct file *, unsigned open_flag,
> +			   umode_t create_mode, int *opened);
>  	int (*tmpfile) (struct inode *, struct dentry *, umode_t);
> +	int (*set_acl)(struct inode *, struct posix_acl *, int);
> +
> +	/* WARNING: probably going away soon, do not use! */
>  	int (*dentry_open)(struct dentry *, struct file *, const struct cred *);
> -};
> +} ____cacheline_aligned;
>  
>  Again, all methods are called without any locks being held, unless
>  otherwise noted.
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