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

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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>
This commit is contained in:
Al Viro 2016-04-14 19:52:13 -04:00
parent 0568d705b0
commit 85c7f81041
3 changed files with 35 additions and 0 deletions
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13
fs/dcache.c
View File

@ -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);

4
fs/namei.c
View File

@ -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;

18
include/linux/dcache.h
View File

@ -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)