On Tue 05-05-15 06:21:39, Al Viro wrote:
> From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
>
> let "fast" symlinks store the pointer to the body into ->i_link and
> use simple_follow_link for ->follow_link()
>
> Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Looks good. You can add:
Reviewed-by: Jan Kara <jack@xxxxxxx>
Honza
> ---
> fs/inode.c | 1 +
> fs/libfs.c | 13 +++++++++++++
> include/linux/fs.h | 3 +++
> 3 files changed, 17 insertions(+)
>
> diff --git a/fs/inode.c b/fs/inode.c
> index ea37cd1..952fb48 100644
> --- a/fs/inode.c
> +++ b/fs/inode.c
> @@ -152,6 +152,7 @@ int inode_init_always(struct super_block *sb, struct inode *inode)
> inode->i_pipe = NULL;
> inode->i_bdev = NULL;
> inode->i_cdev = NULL;
> + inode->i_link = NULL;
> inode->i_rdev = 0;
> inode->dirtied_when = 0;
>
> diff --git a/fs/libfs.c b/fs/libfs.c
> index cb1fb4b..72e4e01 100644
> --- a/fs/libfs.c
> +++ b/fs/libfs.c
> @@ -1093,3 +1093,16 @@ simple_nosetlease(struct file *filp, long arg, struct file_lock **flp,
> return -EINVAL;
> }
> EXPORT_SYMBOL(simple_nosetlease);
> +
> +void *simple_follow_link(struct dentry *dentry, struct nameidata *nd)
> +{
> + nd_set_link(nd, d_inode(dentry)->i_link);
> + return NULL;
> +}
> +EXPORT_SYMBOL(simple_follow_link);
> +
> +const struct inode_operations simple_symlink_inode_operations = {
> + .follow_link = simple_follow_link,
> + .readlink = generic_readlink
> +};
> +EXPORT_SYMBOL(simple_symlink_inode_operations);
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 35ec87e..0ac758f 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -656,6 +656,7 @@ struct inode {
> struct pipe_inode_info *i_pipe;
> struct block_device *i_bdev;
> struct cdev *i_cdev;
> + char *i_link;
> };
>
> __u32 i_generation;
> @@ -2721,6 +2722,8 @@ void __inode_sub_bytes(struct inode *inode, loff_t bytes);
> void inode_sub_bytes(struct inode *inode, loff_t bytes);
> loff_t inode_get_bytes(struct inode *inode);
> void inode_set_bytes(struct inode *inode, loff_t bytes);
> +void *simple_follow_link(struct dentry *, struct nameidata *);
> +extern const struct inode_operations simple_symlink_inode_operations;
>
> extern int iterate_dir(struct file *, struct dir_context *);
>
> --
> 2.1.4
>
> --
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--
Jan Kara <jack@xxxxxxx>
SUSE Labs, CR
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