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    Subject[PATCH v3 005/110] libfs: simple_follow_link()
    Date
    From: Al Viro <viro@zeniv.linux.org.uk>

    let "fast" symlinks store the pointer to the body into ->i_link and
    use simple_follow_link for ->follow_link()

    Reviewed-by: Jan Kara <jack@suse.cz>
    Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
    ---
    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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