Commit 43e23b6c authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman
Browse files

debugfs: log errors when something goes wrong 



As it is not recommended that debugfs calls be checked, it was pointed
out that major errors should still be logged somewhere so that
developers and users have a chance to figure out what went wrong.  To
help with this, error logging has been added to the debugfs core so that
it is not needed to be present in every individual file that calls
debugfs.

Reported-by: default avatarMark Brown <broonie@kernel.org>
Reported-by: default avatarTakashi Iwai <tiwai@suse.de>
Reviewed-by: default avatarMark Brown <broonie@kernel.org>
Reviewed-by: default avatarTakashi Iwai <tiwai@suse.de>
Reviewed-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20190703071653.2799-2-gregkh@linuxfoundation.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent fb59b782

fs/debugfs/inode.c

+20 −5
Original line number Diff line number Diff line
@@ -2,8 +2,9 @@ 
/*

 *  inode.c - part of debugfs, a tiny little debug file system

 *

 *  Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>

 *  Copyright (C) 2004,2019 Greg Kroah-Hartman <greg@kroah.com>

 *  Copyright (C) 2004 IBM Inc.

 *  Copyright (C) 2019 Linux Foundation <gregkh@linuxfoundation.org>

 *

 *  debugfs is for people to use instead of /proc or /sys.

 *  See ./Documentation/core-api/kernel-api.rst for more details.
@@ -292,8 +293,10 @@ static struct dentry *start_creating(const char *name, struct dentry *parent) 


	error = simple_pin_fs(&debug_fs_type, &debugfs_mount,

			      &debugfs_mount_count);

	if (error)

	if (error) {

		pr_err("Unable to pin filesystem for file '%s'\n", name);

		return ERR_PTR(error);

	}



	/* If the parent is not specified, we create it in the root.

	 * We need the root dentry to do this, which is in the super
@@ -307,6 +310,7 @@ static struct dentry *start_creating(const char *name, struct dentry *parent) 
	dentry = lookup_one_len(name, parent, strlen(name));

	if (!IS_ERR(dentry) && d_really_is_positive(dentry)) {

		dput(dentry);

		pr_err("File '%s' already present!\n", name);

		dentry = ERR_PTR(-EEXIST);

	}
@@ -349,8 +353,11 @@ static struct dentry *__debugfs_create_file(const char *name, umode_t mode, 
		return dentry;



	inode = debugfs_get_inode(dentry->d_sb);

	if (unlikely(!inode))

	if (unlikely(!inode)) {

		pr_err("out of free dentries, can not create file '%s'\n",

		       name);

		return failed_creating(dentry);

	}



	inode->i_mode = mode;

	inode->i_private = data;
@@ -511,8 +518,11 @@ struct dentry *debugfs_create_dir(const char *name, struct dentry *parent) 
		return dentry;



	inode = debugfs_get_inode(dentry->d_sb);

	if (unlikely(!inode))

	if (unlikely(!inode)) {

		pr_err("out of free dentries, can not create directory '%s'\n",

		       name);

		return failed_creating(dentry);

	}



	inode->i_mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO;

	inode->i_op = &simple_dir_inode_operations;
@@ -550,8 +560,11 @@ struct dentry *debugfs_create_automount(const char *name, 
		return dentry;



	inode = debugfs_get_inode(dentry->d_sb);

	if (unlikely(!inode))

	if (unlikely(!inode)) {

		pr_err("out of free dentries, can not create automount '%s'\n",

		       name);

		return failed_creating(dentry);

	}



	make_empty_dir_inode(inode);

	inode->i_flags |= S_AUTOMOUNT;
@@ -606,6 +619,8 @@ struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent, 


	inode = debugfs_get_inode(dentry->d_sb);

	if (unlikely(!inode)) {

		pr_err("out of free dentries, can not create symlink '%s'\n",

		       name);

		kfree(link);

		return failed_creating(dentry);

	}

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