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dcache.c: new helper: __d_add()

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d_add() with inode->i_lock already held; common to d_add() and
d_splice_alias().  All ->lookup() instances that end up hashing
the dentry they are given will hash it here.

This almost completes the preparations to parallel lookups
proper - the only remaining bit is taking security_d_instantiate()
past d_rehash() and doing rehashing without dropping ->d_lock.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-03-09 19:52:39 -05:00
parent de689f5e36
commit ed782b5a70
1 changed files with 17 additions and 7 deletions
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24
fs/dcache.c
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@ -2360,6 +2360,19 @@ void d_rehash(struct dentry * entry)
}
EXPORT_SYMBOL(d_rehash);
/* inode->i_lock held if inode is non-NULL */
static inline void __d_add(struct dentry *dentry, struct inode *inode)
{
if (inode) {
__d_instantiate(dentry, inode);
spin_unlock(&inode->i_lock);
}
security_d_instantiate(dentry, inode);
d_rehash(dentry);
}
/**
* d_add - add dentry to hash queues
* @entry: dentry to add
@ -2371,8 +2384,9 @@ EXPORT_SYMBOL(d_rehash);
void d_add(struct dentry *entry, struct inode *inode)
{
d_instantiate(entry, inode);
d_rehash(entry);
if (inode)
spin_lock(&inode->i_lock);
__d_add(entry, inode);
}
EXPORT_SYMBOL(d_add);
@ -2798,12 +2812,8 @@ struct dentry *d_splice_alias(struct inode *inode, struct dentry *dentry)
return new;
}
}
/* already taking inode->i_lock, so d_add() by hand */
__d_instantiate(dentry, inode);
spin_unlock(&inode->i_lock);
out:
security_d_instantiate(dentry, inode);
d_rehash(dentry);
__d_add(dentry, inode);
return NULL;
}
EXPORT_SYMBOL(d_splice_alias);