diff --git a/fs/dcache.c b/fs/dcache.c index 21dffeec755bc1a742e49c650c6cf13e385c93ce..940d188e5d14a90730fe170b59eaa426012ef546 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -1100,6 +1100,32 @@ struct dentry * __d_lookup(struct dentry * parent, struct qstr * name) return found; } +/** + * d_hash_and_lookup - hash the qstr then search for a dentry + * @dir: Directory to search in + * @name: qstr of name we wish to find + * + * On hash failure or on lookup failure NULL is returned. + */ +struct dentry *d_hash_and_lookup(struct dentry *dir, struct qstr *name) +{ + struct dentry *dentry = NULL; + + /* + * Check for a fs-specific hash function. Note that we must + * calculate the standard hash first, as the d_op->d_hash() + * routine may choose to leave the hash value unchanged. + */ + name->hash = full_name_hash(name->name, name->len); + if (dir->d_op && dir->d_op->d_hash) { + if (dir->d_op->d_hash(dir, name) < 0) + goto out; + } + dentry = d_lookup(dir, name); +out: + return dentry; +} + /** * d_validate - verify dentry provided from insecure source * @dentry: The dentry alleged to be valid child of @dparent @@ -1616,26 +1642,12 @@ ino_t find_inode_number(struct dentry *dir, struct qstr *name) struct dentry * dentry; ino_t ino = 0; - /* - * Check for a fs-specific hash function. Note that we must - * calculate the standard hash first, as the d_op->d_hash() - * routine may choose to leave the hash value unchanged. - */ - name->hash = full_name_hash(name->name, name->len); - if (dir->d_op && dir->d_op->d_hash) - { - if (dir->d_op->d_hash(dir, name) != 0) - goto out; - } - - dentry = d_lookup(dir, name); - if (dentry) - { + dentry = d_hash_and_lookup(dir, name); + if (dentry) { if (dentry->d_inode) ino = dentry->d_inode->i_ino; dput(dentry); } -out: return ino; } diff --git a/include/linux/dcache.h b/include/linux/dcache.h index d10bd30c337e2ca56da7a33cac3be9e83deab955..836325ee0931eef5398a304766217cc4388589f8 100644 --- a/include/linux/dcache.h +++ b/include/linux/dcache.h @@ -275,6 +275,7 @@ extern void d_move(struct dentry *, struct dentry *); /* appendix may either be NULL or be used for transname suffixes */ extern struct dentry * d_lookup(struct dentry *, struct qstr *); extern struct dentry * __d_lookup(struct dentry *, struct qstr *); +extern struct dentry * d_hash_and_lookup(struct dentry *, struct qstr *); /* validate "insecure" dentry pointer */ extern int d_validate(struct dentry *, struct dentry *);