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Commit 285b102d authored by Miklos Szeredi's avatar Miklos Szeredi Committed by Al Viro
Browse files

vfs: new d_init method 



Allow filesystem to initialize dentry at allocation time.

Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 17648b87

Documentation/filesystems/Locking

+2 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ prototypes: 
	int (*d_compare)(const struct dentry *, const struct dentry *,

			unsigned int, const char *, const struct qstr *);

	int (*d_delete)(struct dentry *);

	int (*d_init)(struct dentry *);

	void (*d_release)(struct dentry *);

	void (*d_iput)(struct dentry *, struct inode *);

	char *(*d_dname)((struct dentry *dentry, char *buffer, int buflen);
@@ -30,6 +31,7 @@ d_weak_revalidate:no no yes no 
d_hash		no		no		no		maybe

d_compare:	yes		no		no		maybe

d_delete:	no		yes		no		no

d_init:	no		no		yes		no

d_release:	no		no		yes		no

d_prune:        no              yes             no              no

d_iput:		no		no		yes		no

Documentation/filesystems/vfs.txt

+3 −0
Original line number Diff line number Diff line
@@ -923,6 +923,7 @@ struct dentry_operations { 
	int (*d_compare)(const struct dentry *, const struct dentry *,

			unsigned int, const char *, const struct qstr *);

	int (*d_delete)(const struct dentry *);

	int (*d_init)(struct dentry *);

	void (*d_release)(struct dentry *);

	void (*d_iput)(struct dentry *, struct inode *);

	char *(*d_dname)(struct dentry *, char *, int);
@@ -995,6 +996,8 @@ struct dentry_operations { 
	always cache a reachable dentry. d_delete must be constant and

	idempotent.



  d_init: called when a dentry is allocated



  d_release: called when a dentry is really deallocated



  d_iput: called when a dentry loses its inode (just prior to its

fs/dcache.c

+11 −0
Original line number Diff line number Diff line
@@ -1569,6 +1569,7 @@ struct dentry *__d_alloc(struct super_block *sb, const struct qstr *name) 
{

	struct dentry *dentry;

	char *dname;

	int err;



	dentry = kmem_cache_alloc(dentry_cache, GFP_KERNEL);

	if (!dentry)
@@ -1627,6 +1628,16 @@ struct dentry *__d_alloc(struct super_block *sb, const struct qstr *name) 
	INIT_LIST_HEAD(&dentry->d_child);

	d_set_d_op(dentry, dentry->d_sb->s_d_op);



	if (dentry->d_op && dentry->d_op->d_init) {

		err = dentry->d_op->d_init(dentry);

		if (err) {

			if (dname_external(dentry))

				kfree(external_name(dentry));

			kmem_cache_free(dentry_cache, dentry);

			return NULL;

		}

	}



	this_cpu_inc(nr_dentry);



	return dentry;

include/linux/dcache.h

+1 −0
Original line number Diff line number Diff line
@@ -133,6 +133,7 @@ struct dentry_operations { 
	int (*d_compare)(const struct dentry *, const struct dentry *,

			unsigned int, const char *, const struct qstr *);

	int (*d_delete)(const struct dentry *);

	int (*d_init)(struct dentry *);

	void (*d_release)(struct dentry *);

	void (*d_prune)(struct dentry *);

	void (*d_iput)(struct dentry *, struct inode *);