From e0e0be8a835520e2f7c89f214dfda570922a1b90 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Tue, 27 Sep 2016 11:03:57 +0200 Subject: [PATCH] libfs: support RENAME_NOREPLACE in simple_rename() This is trivial to do: - add flags argument to simple_rename() - check if flags doesn't have any other than RENAME_NOREPLACE - assign simple_rename() to .rename2 instead of .rename Filesystems converted: hugetlbfs, ramfs, bpf. Debugfs uses simple_rename() to implement debugfs_rename(), which is for debugfs instances to rename files internally, not for userspace filesystem access. For this case pass zero flags to simple_rename(). Signed-off-by: Miklos Szeredi Acked-by: Greg Kroah-Hartman Cc: Alexei Starovoitov --- fs/debugfs/inode.c | 2 +- fs/hugetlbfs/inode.c | 2 +- fs/libfs.c | 6 +++++- fs/ramfs/inode.c | 2 +- include/linux/fs.h | 3 ++- kernel/bpf/inode.c | 2 +- 6 files changed, 11 insertions(+), 6 deletions(-) diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c index 72361baf9da7..5ac27c9de669 100644 --- a/fs/debugfs/inode.c +++ b/fs/debugfs/inode.c @@ -748,7 +748,7 @@ struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry, old_name = fsnotify_oldname_init(old_dentry->d_name.name); error = simple_rename(d_inode(old_dir), old_dentry, d_inode(new_dir), - dentry); + dentry, 0); if (error) { fsnotify_oldname_free(old_name); goto exit; diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index 4ea71eba40a5..50cd7475a942 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -988,7 +988,7 @@ static const struct inode_operations hugetlbfs_dir_inode_operations = { .mkdir = hugetlbfs_mkdir, .rmdir = simple_rmdir, .mknod = hugetlbfs_mknod, - .rename = simple_rename, + .rename2 = simple_rename, .setattr = hugetlbfs_setattr, }; diff --git a/fs/libfs.c b/fs/libfs.c index 74dc8b9e7f53..4758353b2d41 100644 --- a/fs/libfs.c +++ b/fs/libfs.c @@ -349,11 +349,15 @@ int simple_rmdir(struct inode *dir, struct dentry *dentry) EXPORT_SYMBOL(simple_rmdir); int simple_rename(struct inode *old_dir, struct dentry *old_dentry, - struct inode *new_dir, struct dentry *new_dentry) + struct inode *new_dir, struct dentry *new_dentry, + unsigned int flags) { struct inode *inode = d_inode(old_dentry); int they_are_dirs = d_is_dir(old_dentry); + if (flags & ~RENAME_NOREPLACE) + return -EINVAL; + if (!simple_empty(new_dentry)) return -ENOTEMPTY; diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c index 1ab6e6c2e60e..c2aa068ff974 100644 --- a/fs/ramfs/inode.c +++ b/fs/ramfs/inode.c @@ -146,7 +146,7 @@ static const struct inode_operations ramfs_dir_inode_operations = { .mkdir = ramfs_mkdir, .rmdir = simple_rmdir, .mknod = ramfs_mknod, - .rename = simple_rename, + .rename2 = simple_rename, }; static const struct super_operations ramfs_ops = { diff --git a/include/linux/fs.h b/include/linux/fs.h index 901e25d495cc..2bd67545fdf8 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2950,7 +2950,8 @@ extern int simple_open(struct inode *inode, struct file *file); extern int simple_link(struct dentry *, struct inode *, struct dentry *); extern int simple_unlink(struct inode *, struct dentry *); extern int simple_rmdir(struct inode *, struct dentry *); -extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); +extern int simple_rename(struct inode *, struct dentry *, + struct inode *, struct dentry *, unsigned int); extern int noop_fsync(struct file *, loff_t, loff_t, int); extern int simple_empty(struct dentry *); extern int simple_readpage(struct file *file, struct page *page); diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c index 5967b870a895..c92fd8936d33 100644 --- a/kernel/bpf/inode.c +++ b/kernel/bpf/inode.c @@ -189,7 +189,7 @@ static const struct inode_operations bpf_dir_iops = { .mknod = bpf_mkobj, .mkdir = bpf_mkdir, .rmdir = simple_rmdir, - .rename = simple_rename, + .rename2 = simple_rename, .link = simple_link, .unlink = simple_unlink, };