beginning of transition to parallel lookups - marking in-lookup dentries

marked as such when (would be) parallel lookup is about to pass them
to actual ->lookup(); unmarked when
	* __d_add() is about to make it hashed, positive or not.
	* __d_move() (from d_splice_alias(), directly or via
__d_unalias()) puts a preexisting dentry in its place
	* in caller of ->lookup() if it has escaped all of the
above.  Bug (WARN_ON, actually) if it reaches the final dput()
or d_instantiate() while still marked such.

As the result, we are guaranteed that for as long as the flag is
set, dentry will
	* remain negative unhashed with positive refcount
	* never have its ->d_alias looked at
	* never have its ->d_lru looked at
	* never have its ->d_parent and ->d_name changed

Right now we have at most one such for any given parent directory.
With parallel lookups that restriction will weaken to
	* only exist when parent is locked shared
	* at most one with given (parent,name) pair (comparison of
names is according to ->d_compare())
	* only exist when there's no hashed dentry with the same
(parent,name)

Transition will take the next several commits; unfortunately, we'll
only be able to switch to rwsem at the end of this series.  The
reason for not making it a single patch is to simplify review.

New primitives: d_in_lookup() (a predicate checking if dentry is in
the in-lookup state) and d_lookup_done() (tells the system that
we are done with lookup and if it's still marked as in-lookup, it
should cease to be such).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/dcache.c b/fs/dcache.c
index 20394fb..0f1d938 100644 (file)
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -761,6 +761,8 @@ repeat:
        /* Slow case: now with the dentry lock held */
        rcu_read_unlock();
 
+       WARN_ON(d_in_lookup(dentry));
+
        /* Unreachable? Get rid of it */
        if (unlikely(d_unhashed(dentry)))
                goto kill_it;
@@ -1746,6 +1748,7 @@ type_determined:
 static void __d_instantiate(struct dentry *dentry, struct inode *inode)
 {
        unsigned add_flags = d_flags_for_inode(inode);
+       WARN_ON(d_in_lookup(dentry));
 
        spin_lock(&dentry->d_lock);
        hlist_add_head(&dentry->d_u.d_alias, &inode->i_dentry);
@@ -2361,12 +2364,20 @@ void d_rehash(struct dentry * entry)
 }
 EXPORT_SYMBOL(d_rehash);
 
+void __d_lookup_done(struct dentry *dentry)
+{
+       dentry->d_flags &= ~DCACHE_PAR_LOOKUP;
+       /* more stuff will land here */
+}
+EXPORT_SYMBOL(__d_lookup_done);
 
 /* inode->i_lock held if inode is non-NULL */
 
 static inline void __d_add(struct dentry *dentry, struct inode *inode)
 {
        spin_lock(&dentry->d_lock);
+       if (unlikely(d_in_lookup(dentry)))
+               __d_lookup_done(dentry);
        if (inode) {
                unsigned add_flags = d_flags_for_inode(inode);
                hlist_add_head(&dentry->d_u.d_alias, &inode->i_dentry);
@@ -2612,6 +2623,8 @@ static void __d_move(struct dentry *dentry, struct dentry *target,
        BUG_ON(d_ancestor(target, dentry));
 
        dentry_lock_for_move(dentry, target);
+       if (unlikely(d_in_lookup(target)))
+               __d_lookup_done(target);
 
        write_seqcount_begin(&dentry->d_seq);
        write_seqcount_begin_nested(&target->d_seq, DENTRY_D_LOCK_NESTED);

diff --git a/fs/namei.c b/fs/namei.c
index c275635..26e5f84 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1634,7 +1634,11 @@ static struct dentry *lookup_slow(const struct qstr *name,
                inode_unlock(inode);
                return ERR_PTR(-ENOMEM);
        }
+       spin_lock(&dentry->d_lock);
+       dentry->d_flags |= DCACHE_PAR_LOOKUP;
+       spin_unlock(&dentry->d_lock);
        old = inode->i_op->lookup(inode, dentry, flags);
+       d_lookup_done(dentry);
        if (unlikely(old)) {
                dput(dentry);
                dentry = old;

diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 4bb4de8..9a7aa89 100644 (file)
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -232,6 +232,8 @@ struct dentry_operations {
 #define DCACHE_ENCRYPTED_WITH_KEY      0x04000000 /* dir is encrypted with a valid key */
 #define DCACHE_OP_REAL                 0x08000000
 
+#define DCACHE_PAR_LOOKUP              0x10000000 /* being looked up (with parent locked shared) */
+
 extern seqlock_t rename_lock;
 
 /*
@@ -367,6 +369,22 @@ static inline void dont_mount(struct dentry *dentry)
        spin_unlock(&dentry->d_lock);
 }
 
+extern void __d_lookup_done(struct dentry *);
+
+static inline int d_in_lookup(struct dentry *dentry)
+{
+       return dentry->d_flags & DCACHE_PAR_LOOKUP;
+}
+
+static inline void d_lookup_done(struct dentry *dentry)
+{
+       if (unlikely(d_in_lookup(dentry))) {
+               spin_lock(&dentry->d_lock);
+               __d_lookup_done(dentry);
+               spin_unlock(&dentry->d_lock);
+       }
+}
+
 extern void dput(struct dentry *);
 
 static inline bool d_managed(const struct dentry *dentry)