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Commit c6b1de1b authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'debugfs_automount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 

Pull debugfs patches from Al Viro:
 "debugfs patches, mostly to make it possible for something like tracefs
  to be transparently automounted on given directory in debugfs.

  New primitive in there is debugfs_create_automount(name, parent, func,
  arg), which creates a directory and makes its ->d_automount() return
  func(arg).  Another missing primitive was debugfs_create_file_size() -
  open-coded in quite a few places.  Dave's patch adds it and converts
  the open-code instances to calling it"

* 'debugfs_automount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  debugfs: Provide a file creation function that also takes an initial size
  new primitive: debugfs_create_automount()
  debugfs: split end_creating() into success and failure cases
  debugfs: take mode-dependent parts of debugfs_get_inode() into callers
  fold debugfs_mknod() into callers
  fold debugfs_create() into caller
  fold debugfs_mkdir() into caller
  debugfs_mknod(): get rid useless arguments
  fold debugfs_link() into caller
  debugfs: kill __create_file()
  debugfs: split the beginning and the end of __create_file() off
  debugfs_{mkdir,create,link}(): get rid of redundant argument
parents 50652963 e59b4e91

drivers/infiniband/hw/cxgb4/device.c

+11 −24
Original line number Diff line number Diff line
@@ -700,37 +700,24 @@ static const struct file_operations ep_debugfs_fops = { 


static int setup_debugfs(struct c4iw_dev *devp)

{

	struct dentry *de;



	if (!devp->debugfs_root)

		return -1;



	de = debugfs_create_file("qps", S_IWUSR, devp->debugfs_root,

				 (void *)devp, &qp_debugfs_fops);

	if (de && de->d_inode)

		de->d_inode->i_size = 4096;

	debugfs_create_file_size("qps", S_IWUSR, devp->debugfs_root,

				 (void *)devp, &qp_debugfs_fops, 4096);



	de = debugfs_create_file("stags", S_IWUSR, devp->debugfs_root,

				 (void *)devp, &stag_debugfs_fops);

	if (de && de->d_inode)

		de->d_inode->i_size = 4096;

	debugfs_create_file_size("stags", S_IWUSR, devp->debugfs_root,

				 (void *)devp, &stag_debugfs_fops, 4096);



	de = debugfs_create_file("stats", S_IWUSR, devp->debugfs_root,

			(void *)devp, &stats_debugfs_fops);

	if (de && de->d_inode)

		de->d_inode->i_size = 4096;

	debugfs_create_file_size("stats", S_IWUSR, devp->debugfs_root,

				 (void *)devp, &stats_debugfs_fops, 4096);



	de = debugfs_create_file("eps", S_IWUSR, devp->debugfs_root,

			(void *)devp, &ep_debugfs_fops);

	if (de && de->d_inode)

		de->d_inode->i_size = 4096;

	debugfs_create_file_size("eps", S_IWUSR, devp->debugfs_root,

				 (void *)devp, &ep_debugfs_fops, 4096);



	if (c4iw_wr_log) {

		de = debugfs_create_file("wr_log", S_IWUSR, devp->debugfs_root,

					 (void *)devp, &wr_log_debugfs_fops);

		if (de && de->d_inode)

			de->d_inode->i_size = 4096;

	}

	if (c4iw_wr_log)

		debugfs_create_file_size("wr_log", S_IWUSR, devp->debugfs_root,

					 (void *)devp, &wr_log_debugfs_fops, 4096);

	return 0;

}

drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c

+3 −6
Original line number Diff line number Diff line
@@ -1950,12 +1950,9 @@ static void set_debugfs_file_size(struct dentry *de, loff_t size) 
static void add_debugfs_mem(struct adapter *adap, const char *name,

			    unsigned int idx, unsigned int size_mb)

{

	struct dentry *de;



	de = debugfs_create_file(name, S_IRUSR, adap->debugfs_root,

				 (void *)adap + idx, &mem_debugfs_fops);

	if (de && de->d_inode)

		de->d_inode->i_size = size_mb << 20;

	debugfs_create_file_size(name, S_IRUSR, adap->debugfs_root,

				 (void *)adap + idx, &mem_debugfs_fops,

				 size_mb << 20);

}



/* Add an array of Debug FS files.

drivers/scsi/csiostor/csio_init.c

+3 −6
Original line number Diff line number Diff line
@@ -113,12 +113,9 @@ static const struct file_operations csio_mem_debugfs_fops = { 
void csio_add_debugfs_mem(struct csio_hw *hw, const char *name,

				 unsigned int idx, unsigned int size_mb)

{

	struct dentry *de;



	de = debugfs_create_file(name, S_IRUSR, hw->debugfs_root,

				 (void *)hw + idx, &csio_mem_debugfs_fops);

	if (de && de->d_inode)

		de->d_inode->i_size = size_mb << 20;

	debugfs_create_file_size(name, S_IRUSR, hw->debugfs_root,

				 (void *)hw + idx, &csio_mem_debugfs_fops,

				 size_mb << 20);

}



static int csio_setup_debugfs(struct csio_hw *hw)

drivers/usb/gadget/udc/atmel_usba_udc.c

+9 −6
Original line number Diff line number Diff line
@@ -265,14 +265,17 @@ static void usba_init_debugfs(struct usba_udc *udc) 
		goto err_root;

	udc->debugfs_root = root;



	regs = debugfs_create_file("regs", 0400, root, udc, &regs_dbg_fops);

	if (!regs)

		goto err_regs;



	regs_resource = platform_get_resource(udc->pdev, IORESOURCE_MEM,

				CTRL_IOMEM_ID);

	regs->d_inode->i_size = resource_size(regs_resource);



	if (regs_resource) {

		regs = debugfs_create_file_size("regs", 0400, root, udc,

						&regs_dbg_fops,

						resource_size(regs_resource));

		if (!regs)

			goto err_regs;

		udc->debugfs_regs = regs;

	}



	usba_ep_init_debugfs(udc, to_usba_ep(udc->gadget.ep0));

fs/debugfs/inode.c

+168 −123
Original line number Diff line number Diff line
@@ -34,93 +34,16 @@ static struct vfsmount *debugfs_mount; 
static int debugfs_mount_count;

static bool debugfs_registered;



static struct inode *debugfs_get_inode(struct super_block *sb, umode_t mode, dev_t dev,

				       void *data, const struct file_operations *fops)



static struct inode *debugfs_get_inode(struct super_block *sb)

{

	struct inode *inode = new_inode(sb);



	if (inode) {

		inode->i_ino = get_next_ino();

		inode->i_mode = mode;

		inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;

		switch (mode & S_IFMT) {

		default:

			init_special_inode(inode, mode, dev);

			break;

		case S_IFREG:

			inode->i_fop = fops ? fops : &debugfs_file_operations;

			inode->i_private = data;

			break;

		case S_IFLNK:

			inode->i_op = &debugfs_link_operations;

			inode->i_private = data;

			break;

		case S_IFDIR:

			inode->i_op = &simple_dir_inode_operations;

			inode->i_fop = &simple_dir_operations;



			/* directory inodes start off with i_nlink == 2

			 * (for "." entry) */

			inc_nlink(inode);

			break;

		}

	}

	return inode;

}



/* SMP-safe */

static int debugfs_mknod(struct inode *dir, struct dentry *dentry,

			 umode_t mode, dev_t dev, void *data,

			 const struct file_operations *fops)

{

	struct inode *inode;

	int error = -EPERM;



	if (dentry->d_inode)

		return -EEXIST;



	inode = debugfs_get_inode(dir->i_sb, mode, dev, data, fops);

	if (inode) {

		d_instantiate(dentry, inode);

		dget(dentry);

		error = 0;

	}

	return error;

}



static int debugfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)

{

	int res;



	mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR;

	res = debugfs_mknod(dir, dentry, mode, 0, NULL, NULL);

	if (!res) {

		inc_nlink(dir);

		fsnotify_mkdir(dir, dentry);

	}

	return res;

}



static int debugfs_link(struct inode *dir, struct dentry *dentry, umode_t mode,

			void *data)

{

	mode = (mode & S_IALLUGO) | S_IFLNK;

	return debugfs_mknod(dir, dentry, mode, 0, data, NULL);

}



static int debugfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,

			  void *data, const struct file_operations *fops)

{

	int res;



	mode = (mode & S_IALLUGO) | S_IFREG;

	res = debugfs_mknod(dir, dentry, mode, 0, data, fops);

	if (!res)

		fsnotify_create(dir, dentry);

	return res;

}



static inline int debugfs_positive(struct dentry *dentry)

{

	return dentry->d_inode && !d_unhashed(dentry);
@@ -252,6 +175,18 @@ static const struct super_operations debugfs_super_operations = { 
	.show_options	= debugfs_show_options,

};



static struct vfsmount *debugfs_automount(struct path *path)

{

	struct vfsmount *(*f)(void *);

	f = (struct vfsmount *(*)(void *))path->dentry->d_fsdata;

	return f(path->dentry->d_inode->i_private);

}



static const struct dentry_operations debugfs_dops = {

	.d_delete = always_delete_dentry,

	.d_automount = debugfs_automount,

};



static int debug_fill_super(struct super_block *sb, void *data, int silent)

{

	static struct tree_descr debug_files[] = {{""}};
@@ -276,6 +211,7 @@ static int debug_fill_super(struct super_block *sb, void *data, int silent) 
		goto fail;



	sb->s_op = &debugfs_super_operations;

	sb->s_d_op = &debugfs_dops;



	debugfs_apply_options(sb);
@@ -302,11 +238,9 @@ static struct file_system_type debug_fs_type = { 
};

MODULE_ALIAS_FS("debugfs");



static struct dentry *__create_file(const char *name, umode_t mode,

				    struct dentry *parent, void *data,

				    const struct file_operations *fops)

static struct dentry *start_creating(const char *name, struct dentry *parent)

{

	struct dentry *dentry = NULL;

	struct dentry *dentry;

	int error;



	pr_debug("debugfs: creating file '%s'\n",name);
@@ -314,7 +248,7 @@ static struct dentry *__create_file(const char *name, umode_t mode, 
	error = simple_pin_fs(&debug_fs_type, &debugfs_mount,

			      &debugfs_mount_count);

	if (error)

		goto exit;

		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
@@ -326,31 +260,26 @@ static struct dentry *__create_file(const char *name, umode_t mode, 


	mutex_lock(&parent->d_inode->i_mutex);

	dentry = lookup_one_len(name, parent, strlen(name));

	if (!IS_ERR(dentry)) {

		switch (mode & S_IFMT) {

		case S_IFDIR:

			error = debugfs_mkdir(parent->d_inode, dentry, mode);



			break;

		case S_IFLNK:

			error = debugfs_link(parent->d_inode, dentry, mode,

					     data);

			break;

		default:

			error = debugfs_create(parent->d_inode, dentry, mode,

					       data, fops);

			break;

		}

	if (!IS_ERR(dentry) && dentry->d_inode) {

		dput(dentry);

	} else

		error = PTR_ERR(dentry);

		dentry = ERR_PTR(-EEXIST);

	}

	if (IS_ERR(dentry))

		mutex_unlock(&parent->d_inode->i_mutex);

	return dentry;

}



	if (error) {

		dentry = NULL;

static struct dentry *failed_creating(struct dentry *dentry)

{

	mutex_unlock(&dentry->d_parent->d_inode->i_mutex);

	dput(dentry);

	simple_release_fs(&debugfs_mount, &debugfs_mount_count);

	return NULL;

}

exit:



static struct dentry *end_creating(struct dentry *dentry)

{

	mutex_unlock(&dentry->d_parent->d_inode->i_mutex);

	return dentry;

}
@@ -384,18 +313,70 @@ struct dentry *debugfs_create_file(const char *name, umode_t mode, 
				   struct dentry *parent, void *data,

				   const struct file_operations *fops)

{

	switch (mode & S_IFMT) {

	case S_IFREG:

	case 0:

		break;

	default:

		BUG();

	}

	struct dentry *dentry;

	struct inode *inode;



	if (!(mode & S_IFMT))

		mode |= S_IFREG;

	BUG_ON(!S_ISREG(mode));

	dentry = start_creating(name, parent);



	return __create_file(name, mode, parent, data, fops);

	if (IS_ERR(dentry))

		return NULL;



	inode = debugfs_get_inode(dentry->d_sb);

	if (unlikely(!inode))

		return failed_creating(dentry);



	inode->i_mode = mode;

	inode->i_fop = fops ? fops : &debugfs_file_operations;

	inode->i_private = data;

	d_instantiate(dentry, inode);

	fsnotify_create(dentry->d_parent->d_inode, dentry);

	return end_creating(dentry);

}

EXPORT_SYMBOL_GPL(debugfs_create_file);



/**

 * debugfs_create_file_size - create a file in the debugfs filesystem

 * @name: a pointer to a string containing the name of the file to create.

 * @mode: the permission that the file should have.

 * @parent: a pointer to the parent dentry for this file.  This should be a

 *          directory dentry if set.  If this parameter is NULL, then the

 *          file will be created in the root of the debugfs filesystem.

 * @data: a pointer to something that the caller will want to get to later

 *        on.  The inode.i_private pointer will point to this value on

 *        the open() call.

 * @fops: a pointer to a struct file_operations that should be used for

 *        this file.

 * @file_size: initial file size

 *

 * This is the basic "create a file" function for debugfs.  It allows for a

 * wide range of flexibility in creating a file, or a directory (if you want

 * to create a directory, the debugfs_create_dir() function is

 * recommended to be used instead.)

 *

 * This function will return a pointer to a dentry if it succeeds.  This

 * pointer must be passed to the debugfs_remove() function when the file is

 * to be removed (no automatic cleanup happens if your module is unloaded,

 * you are responsible here.)  If an error occurs, %NULL will be returned.

 *

 * If debugfs is not enabled in the kernel, the value -%ENODEV will be

 * returned.

 */

struct dentry *debugfs_create_file_size(const char *name, umode_t mode,

					struct dentry *parent, void *data,

					const struct file_operations *fops,

					loff_t file_size)

{

	struct dentry *de = debugfs_create_file(name, mode, parent, data, fops);



	if (de)

		de->d_inode->i_size = file_size;

	return de;

}

EXPORT_SYMBOL_GPL(debugfs_create_file_size);



/**

 * debugfs_create_dir - create a directory in the debugfs filesystem

 * @name: a pointer to a string containing the name of the directory to
@@ -416,11 +397,64 @@ EXPORT_SYMBOL_GPL(debugfs_create_file); 
 */

struct dentry *debugfs_create_dir(const char *name, struct dentry *parent)

{

	return __create_file(name, S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO,

				   parent, NULL, NULL);

	struct dentry *dentry = start_creating(name, parent);

	struct inode *inode;



	if (IS_ERR(dentry))

		return NULL;



	inode = debugfs_get_inode(dentry->d_sb);

	if (unlikely(!inode))

		return failed_creating(dentry);



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

	inode->i_op = &simple_dir_inode_operations;

	inode->i_fop = &simple_dir_operations;



	/* directory inodes start off with i_nlink == 2 (for "." entry) */

	inc_nlink(inode);

	d_instantiate(dentry, inode);

	inc_nlink(dentry->d_parent->d_inode);

	fsnotify_mkdir(dentry->d_parent->d_inode, dentry);

	return end_creating(dentry);

}

EXPORT_SYMBOL_GPL(debugfs_create_dir);



/**

 * debugfs_create_automount - create automount point in the debugfs filesystem

 * @name: a pointer to a string containing the name of the file to create.

 * @parent: a pointer to the parent dentry for this file.  This should be a

 *          directory dentry if set.  If this parameter is NULL, then the

 *          file will be created in the root of the debugfs filesystem.

 * @f: function to be called when pathname resolution steps on that one.

 * @data: opaque argument to pass to f().

 *

 * @f should return what ->d_automount() would.

 */

struct dentry *debugfs_create_automount(const char *name,

					struct dentry *parent,

					struct vfsmount *(*f)(void *),

					void *data)

{

	struct dentry *dentry = start_creating(name, parent);

	struct inode *inode;



	if (IS_ERR(dentry))

		return NULL;



	inode = debugfs_get_inode(dentry->d_sb);

	if (unlikely(!inode))

		return failed_creating(dentry);



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

	inode->i_flags |= S_AUTOMOUNT;

	inode->i_private = data;

	dentry->d_fsdata = (void *)f;

	d_instantiate(dentry, inode);

	return end_creating(dentry);

}

EXPORT_SYMBOL(debugfs_create_automount);



/**

 * debugfs_create_symlink- create a symbolic link in the debugfs filesystem

 * @name: a pointer to a string containing the name of the symbolic link to
@@ -447,17 +481,28 @@ EXPORT_SYMBOL_GPL(debugfs_create_dir); 
struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,

				      const char *target)

{

	struct dentry *result;

	char *link;



	link = kstrdup(target, GFP_KERNEL);

	struct dentry *dentry;

	struct inode *inode;

	char *link = kstrdup(target, GFP_KERNEL);

	if (!link)

		return NULL;



	result = __create_file(name, S_IFLNK | S_IRWXUGO, parent, link, NULL);

	if (!result)

	dentry = start_creating(name, parent);

	if (IS_ERR(dentry)) {

		kfree(link);

	return result;

		return NULL;

	}



	inode = debugfs_get_inode(dentry->d_sb);

	if (unlikely(!inode)) {

		kfree(link);

		return failed_creating(dentry);

	}

	inode->i_mode = S_IFLNK | S_IRWXUGO;

	inode->i_op = &debugfs_link_operations;

	inode->i_private = link;

	d_instantiate(dentry, inode);

	return end_creating(dentry);

}

EXPORT_SYMBOL_GPL(debugfs_create_symlink);