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vfs: new helper - d_make_root() 

d_alloc_root() with iput() in case of allocation failure...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-01-08 16:49:21 -05:00
parent b48f03b319
commit adc0e91ab1
2 changed files with 18 additions and 0 deletions
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17
fs/dcache.c
View File

@ -1440,6 +1440,23 @@ struct dentry * d_alloc_root(struct inode * root_inode)
} }
EXPORT_SYMBOL(d_alloc_root); EXPORT_SYMBOL(d_alloc_root);
struct dentry *d_make_root(struct inode *root_inode)
{
struct dentry *res = NULL;
if (root_inode) {
static const struct qstr name = { .name = "/", .len = 1 };
res = __d_alloc(root_inode->i_sb, &name);
if (res)
d_instantiate(res, root_inode);
else
iput(root_inode);
}
return res;
}
EXPORT_SYMBOL(d_make_root);
static struct dentry * __d_find_any_alias(struct inode *inode) static struct dentry * __d_find_any_alias(struct inode *inode)
{ {
struct dentry *alias; struct dentry *alias;

1
include/linux/dcache.h
View File

@ -249,6 +249,7 @@ extern int d_invalidate(struct dentry *);
/* only used at mount-time */ /* only used at mount-time */
extern struct dentry * d_alloc_root(struct inode *); extern struct dentry * d_alloc_root(struct inode *);
extern struct dentry * d_make_root(struct inode *);
/* <clickety>-<click> the ramfs-type tree */ /* <clickety>-<click> the ramfs-type tree */
extern void d_genocide(struct dentry *); extern void d_genocide(struct dentry *);