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    Subject[PATCH 06/12] fs: factor out d_mark_tmpfile()
    Date
    New helper for bcachefs - bcachefs doesn't want the
    inode_dec_link_count() call that d_tmpfile does, it handles i_nlink on
    its own atomically with other btree updates

    Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
    ---
    fs/dcache.c | 10 ++++++++--
    include/linux/dcache.h | 1 +
    2 files changed, 9 insertions(+), 2 deletions(-)

    diff --git a/fs/dcache.c b/fs/dcache.c
    index aac41adf47..18edb4e5bc 100644
    --- a/fs/dcache.c
    +++ b/fs/dcache.c
    @@ -3042,9 +3042,8 @@ void d_genocide(struct dentry *parent)

    EXPORT_SYMBOL(d_genocide);

    -void d_tmpfile(struct dentry *dentry, struct inode *inode)
    +void d_mark_tmpfile(struct dentry *dentry, struct inode *inode)
    {
    - inode_dec_link_count(inode);
    BUG_ON(dentry->d_name.name != dentry->d_iname ||
    !hlist_unhashed(&dentry->d_u.d_alias) ||
    !d_unlinked(dentry));
    @@ -3054,6 +3053,13 @@ void d_tmpfile(struct dentry *dentry, struct inode *inode)
    (unsigned long long)inode->i_ino);
    spin_unlock(&dentry->d_lock);
    spin_unlock(&dentry->d_parent->d_lock);
    +}
    +EXPORT_SYMBOL(d_mark_tmpfile);
    +
    +void d_tmpfile(struct dentry *dentry, struct inode *inode)
    +{
    + inode_dec_link_count(inode);
    + d_mark_tmpfile(dentry, inode);
    d_instantiate(dentry, inode);
    }
    EXPORT_SYMBOL(d_tmpfile);
    diff --git a/include/linux/dcache.h b/include/linux/dcache.h
    index 60996e64c5..e0fe330162 100644
    --- a/include/linux/dcache.h
    +++ b/include/linux/dcache.h
    @@ -255,6 +255,7 @@ extern struct dentry * d_make_root(struct inode *);
    /* <clickety>-<click> the ramfs-type tree */
    extern void d_genocide(struct dentry *);

    +extern void d_mark_tmpfile(struct dentry *, struct inode *);
    extern void d_tmpfile(struct dentry *, struct inode *);

    extern struct dentry *d_find_alias(struct inode *);
    --
    2.20.1
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