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vfs: new d_init method 

Allow filesystem to initialize dentry at allocation time.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Miklos Szeredi 2016-06-28 11:47:32 +02:00 committed by Al Viro
parent 17648b871d
commit 285b102d3b
4 changed files with 17 additions and 0 deletions
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2
Documentation/filesystems/Locking
View File

@ -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

3
Documentation/filesystems/vfs.txt
View File

@ -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

11
fs/dcache.c
View File

@ -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;

1
include/linux/dcache.h
View File

@ -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 *);