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vfs: document ->d_real()

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Add missing documentation for the d_op->d_real() method and d_real()
helper.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2016-06-30 08:53:27 +02:00
parent 2d902671ce
commit e698b8a436
3 changed files with 36 additions and 1 deletions
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14
include/linux/dcache.h
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@ -139,7 +139,8 @@ struct dentry_operations {
char *(*d_dname)(struct dentry *, char *, int);
struct vfsmount *(*d_automount)(struct path *);
int (*d_manage)(struct dentry *, bool);
struct dentry *(*d_real)(struct dentry *, const struct inode *, unsigned int);
struct dentry *(*d_real)(struct dentry *, const struct inode *,
unsigned int);
} ____cacheline_aligned;
/*
@ -554,6 +555,17 @@ static inline struct dentry *d_backing_dentry(struct dentry *upper)
return upper;
}
/**
* d_real - Return the real dentry
* @dentry: the dentry to query
* @inode: inode to select the dentry from multiple layers (can be NULL)
* @flags: open flags to control copy-up behavior
*
* If dentry is on an union/overlay, then return the underlying, real dentry.
* Otherwise return the dentry itself.
*
* See also: Documentation/filesystems/vfs.txt
*/
static inline struct dentry *d_real(struct dentry *dentry,
const struct inode *inode,
unsigned int flags)