From a7c5437b0bbec5165df6eb1efc5e37dc40b9e05d Mon Sep 17 00:00:00 2001 From: Omar Sandoval Date: Tue, 31 Jan 2017 14:53:17 -0800 Subject: debugfs: add debugfs_lookup() We don't always have easy access to the dentry of a file or directory we created in debugfs. Add a helper which allows us to get a dentry we previously created. The motivation for this change is a problem with blktrace and the blk-mq debugfs entries introduced in 07e4fead45e6 ("blk-mq: create debugfs directory tree"). Namely, in some cases, the directory that blktrace needs to create may already exist, but in other cases, it may not. We _could_ rely on a bunch of implied knowledge to decide whether to create the directory or not, but it's much cleaner on our end to just look it up. Signed-off-by: Omar Sandoval Acked-by: Greg Kroah-Hartman Signed-off-by: Jens Axboe --- fs/debugfs/inode.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) (limited to 'fs/debugfs') diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c index f17fcf89e18e..7fb1732a3630 100644 --- a/fs/debugfs/inode.c +++ b/fs/debugfs/inode.c @@ -248,6 +248,42 @@ static struct file_system_type debug_fs_type = { }; MODULE_ALIAS_FS("debugfs"); +/** + * debugfs_lookup() - look up an existing debugfs file + * @name: a pointer to a string containing the name of the file to look up. + * @parent: a pointer to the parent dentry of the file. + * + * This function will return a pointer to a dentry if it succeeds. If the file + * doesn't exist or an error occurs, %NULL will be returned. The returned + * dentry must be passed to dput() when it is no longer needed. + * + * If debugfs is not enabled in the kernel, the value -%ENODEV will be + * returned. + */ +struct dentry *debugfs_lookup(const char *name, struct dentry *parent) +{ + struct dentry *dentry; + + if (IS_ERR(parent)) + return NULL; + + if (!parent) + parent = debugfs_mount->mnt_root; + + inode_lock(d_inode(parent)); + dentry = lookup_one_len(name, parent, strlen(name)); + inode_unlock(d_inode(parent)); + + if (IS_ERR(dentry)) + return NULL; + if (!d_really_is_positive(dentry)) { + dput(dentry); + return NULL; + } + return dentry; +} +EXPORT_SYMBOL_GPL(debugfs_lookup); + static struct dentry *start_creating(const char *name, struct dentry *parent) { struct dentry *dentry; -- cgit v1.2.3