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authorMiklos Szeredi <mszeredi@suse.cz>2013-10-01 18:44:54 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2013-10-25 07:41:37 +0400
commitb70a80e7a133a0c86f2fa078e7c144597c516415 (patch)
tree378dbeeafc1510fb326eda10e1f48085be098f6c /include/linux/dcache.h
parent94e92a6e772e009e27083a7f42d49a179e5f668c (diff)
downloadlinux-b70a80e7a133a0c86f2fa078e7c144597c516415.tar.xz
vfs: introduce d_instantiate_no_diralias()
...which just returns -EBUSY if a directory alias would be created. This is to be used by fuse mkdir to make sure that a buggy or malicious userspace filesystem doesn't do anything nasty. Previously fuse used a private mutex for this purpose, which can now go away. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'include/linux/dcache.h')
-rw-r--r--include/linux/dcache.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 59066e0b4ff1..716c3760ee39 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -224,6 +224,7 @@ static inline int dname_external(const struct dentry *dentry)
extern void d_instantiate(struct dentry *, struct inode *);
extern struct dentry * d_instantiate_unique(struct dentry *, struct inode *);
extern struct dentry * d_materialise_unique(struct dentry *, struct inode *);
+extern int d_instantiate_no_diralias(struct dentry *, struct inode *);
extern void __d_drop(struct dentry *dentry);
extern void d_drop(struct dentry *dentry);
extern void d_delete(struct dentry *);