Commit 30a59ddd authored by Paulo Alcantara's avatar Paulo Alcantara Committed by Steve French
Browse files

vfs: introduce d_mark_tmpfile_name() 



CIFS requires O_TMPFILE dentries to have names of newly created
delete-on-close files in the server so it can build full pathnames
from the root of the share when performing operations on them.

Suggested-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: default avatarPaulo Alcantara (Red Hat) <pc@manguebit.org>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Jan Kara <jack@suse.cz>
Cc: David Howells <dhowells@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-cifs@vger.kernel.org
Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
parent 158f4ff1

fs/dcache.c

+19 −0
Original line number Diff line number Diff line
@@ -3196,6 +3196,25 @@ void d_mark_tmpfile(struct file *file, struct inode *inode) 
}

EXPORT_SYMBOL(d_mark_tmpfile);



void d_mark_tmpfile_name(struct file *file, const struct qstr *name)

{

	struct dentry *dentry = file->f_path.dentry;

	char *dname = dentry->d_shortname.string;



	BUG_ON(dname_external(dentry));

	BUG_ON(d_really_is_positive(dentry));

	BUG_ON(!d_unlinked(dentry));

	BUG_ON(name->len > DNAME_INLINE_LEN - 1);

	spin_lock(&dentry->d_parent->d_lock);

	spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);

	dentry->__d_name.len = name->len;

	memcpy(dname, name->name, name->len);

	dname[name->len] = '\0';

	spin_unlock(&dentry->d_lock);

	spin_unlock(&dentry->d_parent->d_lock);

}

EXPORT_SYMBOL(d_mark_tmpfile_name);



void d_tmpfile(struct file *file, struct inode *inode)

{

	struct dentry *dentry = file->f_path.dentry;

include/linux/dcache.h

+1 −0
Original line number Diff line number Diff line
@@ -264,6 +264,7 @@ extern void d_invalidate(struct dentry *); 
extern struct dentry * d_make_root(struct inode *);



extern void d_mark_tmpfile(struct file *, struct inode *);

void d_mark_tmpfile_name(struct file *file, const struct qstr *name);

extern void d_tmpfile(struct file *, struct inode *);



extern struct dentry *d_find_alias(struct inode *);