configfs: implement binary attributes (03607ace) · Commits · 戴 / test

Documentation/filesystems/configfs/configfs.txt

+48 −9

Original line number	Diff line number	Diff line
		@@ -51,15 +51,27 @@ configfs tree is always there, whether mounted on /config or not.
		An item is created via mkdir(2). The item's attributes will also
		appear at this time. readdir(3) can determine what the attributes are,
		read(2) can query their default values, and write(2) can store new
		values. Like sysfs, attributes should be ASCII text files, preferably
		with only one value per file. The same efficiency caveats from sysfs
		apply. Don't mix more than one attribute in one attribute file.

		Like sysfs, configfs expects write(2) to store the entire buffer at
		once. When writing to configfs attributes, userspace processes should
		first read the entire file, modify the portions they wish to change, and
		then write the entire buffer back. Attribute files have a maximum size
		of one page (PAGE_SIZE, 4096 on i386).
		values. Don't mix more than one attribute in one attribute file.

		There are two types of configfs attributes:

		* Normal attributes, which similar to sysfs attributes, are small ASCII text
		files, with a maximum size of one page (PAGE_SIZE, 4096 on i386). Preferably
		only one value per file should be used, and the same caveats from sysfs apply.
		Configfs expects write(2) to store the entire buffer at once. When writing to
		normal configfs attributes, userspace processes should first read the entire
		file, modify the portions they wish to change, and then write the entire
		buffer back.

		* Binary attributes, which are somewhat similar to sysfs binary attributes,
		but with a few slight changes to semantics. The PAGE_SIZE limitation does not
		apply, but the whole binary item must fit in single kernel vmalloc'ed buffer.
		The write(2) calls from user space are buffered, and the attributes'
		write_bin_attribute method will be invoked on the final close, therefore it is
		imperative for user-space to check the return code of close(2) in order to
		verify that the operation finished successfully.
		To avoid a malicious user OOMing the kernel, there's a per-binary attribute
		maximum buffer value.

		When an item needs to be destroyed, remove it with rmdir(2). An
		item cannot be destroyed if any other item has a link to it (via
		@@ -171,6 +183,7 @@ among other things. For that, it needs a type.
		struct configfs_item_operations *ct_item_ops;
		struct configfs_group_operations *ct_group_ops;
		struct configfs_attribute **ct_attrs;
		struct configfs_bin_attribute **ct_bin_attrs;
		};

		The most basic function of a config_item_type is to define what
		@@ -201,6 +214,32 @@ be called whenever userspace asks for a read(2) on the attribute. If an
		attribute is writable and provides a ->store method, that method will be
		be called whenever userspace asks for a write(2) on the attribute.

		[struct configfs_bin_attribute]

		struct configfs_attribute {
		struct configfs_attribute cb_attr;
		void *cb_private;
		size_t cb_max_size;
		};

		The binary attribute is used when the one needs to use binary blob to
		appear as the contents of a file in the item's configfs directory.
		To do so add the binary attribute to the NULL-terminated array
		config_item_type->ct_bin_attrs, and the item appears in configfs, the
		attribute file will appear with the configfs_bin_attribute->cb_attr.ca_name
		filename. configfs_bin_attribute->cb_attr.ca_mode specifies the file
		permissions.
		The cb_private member is provided for use by the driver, while the
		cb_max_size member specifies the maximum amount of vmalloc buffer
		to be used.

		If binary attribute is readable and the config_item provides a
		ct_item_ops->read_bin_attribute() method, that method will be called
		whenever userspace asks for a read(2) on the attribute. The converse
		will happen for write(2). The reads/writes are bufferred so only a
		single read/write will occur; the attributes' need not concern itself
		with it.

		[struct config_group]

		A config_item cannot live in a vacuum. The only way one can be created

fs/configfs/configfs_internal.h

+12 −2

Original line number	Diff line number	Diff line
		@@ -53,13 +53,14 @@ struct configfs_dirent {
		#define CONFIGFS_ROOT 0x0001
		#define CONFIGFS_DIR 0x0002
		#define CONFIGFS_ITEM_ATTR 0x0004
		#define CONFIGFS_ITEM_BIN_ATTR 0x0008
		#define CONFIGFS_ITEM_LINK 0x0020
		#define CONFIGFS_USET_DIR 0x0040
		#define CONFIGFS_USET_DEFAULT 0x0080
		#define CONFIGFS_USET_DROPPING 0x0100
		#define CONFIGFS_USET_IN_MKDIR 0x0200
		#define CONFIGFS_USET_CREATING 0x0400
		#define CONFIGFS_NOT_PINNED (CONFIGFS_ITEM_ATTR)
		#define CONFIGFS_NOT_PINNED (CONFIGFS_ITEM_ATTR \| CONFIGFS_ITEM_BIN_ATTR)

		extern struct mutex configfs_symlink_mutex;
		extern spinlock_t configfs_dirent_lock;
		@@ -72,6 +73,8 @@ extern struct inode * configfs_new_inode(umode_t mode, struct configfs_dirent *,
		extern int configfs_create(struct dentry , umode_t mode, void (init)(struct inode *));

		extern int configfs_create_file(struct config_item , const struct configfs_attribute );
		extern int configfs_create_bin_file(struct config_item *,
		const struct configfs_bin_attribute *);
		extern int configfs_make_dirent(struct configfs_dirent *,
		struct dentry , void , umode_t, int);
		extern int configfs_dirent_is_ready(struct configfs_dirent *);
		@@ -88,7 +91,7 @@ extern void configfs_release_fs(void);
		extern struct rw_semaphore configfs_rename_sem;
		extern const struct file_operations configfs_dir_operations;
		extern const struct file_operations configfs_file_operations;
		extern const struct file_operations bin_fops;
		extern const struct file_operations configfs_bin_file_operations;
		extern const struct inode_operations configfs_dir_inode_operations;
		extern const struct inode_operations configfs_root_inode_operations;
		extern const struct inode_operations configfs_symlink_inode_operations;
		@@ -119,6 +122,13 @@ static inline struct configfs_attribute * to_attr(struct dentry * dentry)
		return ((struct configfs_attribute *) sd->s_element);
		}

		static inline struct configfs_bin_attribute to_bin_attr(struct dentry dentry)
		{
		struct configfs_attribute *attr = to_attr(dentry);

		return container_of(attr, struct configfs_bin_attribute, cb_attr);
		}

		static inline struct config_item configfs_get_config_item(struct dentry dentry)
		{
		struct config_item * item = NULL;

fs/configfs/dir.c

+17 −1

Original line number	Diff line number	Diff line
		@@ -255,6 +255,12 @@ static void configfs_init_file(struct inode * inode)
		inode->i_fop = &configfs_file_operations;
		}

		static void configfs_init_bin_file(struct inode *inode)
		{
		inode->i_size = 0;
		inode->i_fop = &configfs_bin_file_operations;
		}

		static void init_symlink(struct inode * inode)
		{
		inode->i_op = &configfs_symlink_inode_operations;
		@@ -423,6 +429,8 @@ static int configfs_attach_attr(struct configfs_dirent * sd, struct dentry * den
		spin_unlock(&configfs_dirent_lock);

		error = configfs_create(dentry, (attr->ca_mode & S_IALLUGO) \| S_IFREG,
		(sd->s_type & CONFIGFS_ITEM_BIN_ATTR) ?
		configfs_init_bin_file :
		configfs_init_file);
		if (error) {
		configfs_put(sd);
		@@ -583,6 +591,7 @@ static int populate_attrs(struct config_item *item)
		{
		struct config_item_type *t = item->ci_type;
		struct configfs_attribute *attr;
		struct configfs_bin_attribute *bin_attr;
		int error = 0;
		int i;

		@@ -594,6 +603,13 @@ static int populate_attrs(struct config_item *item)
		break;
		}
		}
		if (t->ct_bin_attrs) {
		for (i = 0; (bin_attr = t->ct_bin_attrs[i]) != NULL; i++) {
		error = configfs_create_bin_file(item, bin_attr);
		if (error)
		break;
		}
		}

		if (error)
		detach_attrs(item);

fs/configfs/file.c

+246 −9

Original line number	Diff line number	Diff line
		@@ -28,6 +28,7 @@
		#include <linux/module.h>
		#include <linux/slab.h>
		#include <linux/mutex.h>
		#include <linux/vmalloc.h>
		#include <asm/uaccess.h>

		#include <linux/configfs.h>
		@@ -48,6 +49,10 @@ struct configfs_buffer {
		struct configfs_item_operations * ops;
		struct mutex mutex;
		int needs_read_fill;
		bool read_in_progress;
		bool write_in_progress;
		char *bin_buffer;
		int bin_buffer_size;
		};


		@@ -123,6 +128,87 @@ out:
		return retval;
		}

		/**
		* configfs_read_bin_file - read a binary attribute.
		* @file: file pointer.
		* @buf: buffer to fill.
		* @count: number of bytes to read.
		* @ppos: starting offset in file.
		*
		* Userspace wants to read a binary attribute file. The attribute
		* descriptor is in the file's ->d_fsdata. The target item is in the
		* directory's ->d_fsdata.
		*
		* We check whether we need to refill the buffer. If so we will
		* call the attributes' attr->read() twice. The first time we
		* will pass a NULL as a buffer pointer, which the attributes' method
		* will use to return the size of the buffer required. If no error
		* occurs we will allocate the buffer using vmalloc and call
		* attr->read() again passing that buffer as an argument.
		* Then we just copy to user-space using simple_read_from_buffer.
		*/

		static ssize_t
		configfs_read_bin_file(struct file file, char __user buf,
		size_t count, loff_t *ppos)
		{
		struct configfs_buffer *buffer = file->private_data;
		struct dentry *dentry = file->f_path.dentry;
		struct config_item *item = to_item(dentry->d_parent);
		struct configfs_bin_attribute *bin_attr = to_bin_attr(dentry);
		ssize_t retval = 0;
		ssize_t len = min_t(size_t, count, PAGE_SIZE);

		mutex_lock(&buffer->mutex);

		/* we don't support switching read/write modes */
		if (buffer->write_in_progress) {
		retval = -ETXTBSY;
		goto out;
		}
		buffer->read_in_progress = 1;

		if (buffer->needs_read_fill) {
		/* perform first read with buf == NULL to get extent */
		len = bin_attr->read(item, NULL, 0);
		if (len <= 0) {
		retval = len;
		goto out;
		}

		/* do not exceed the maximum value */
		if (bin_attr->cb_max_size && len > bin_attr->cb_max_size) {
		retval = -EFBIG;
		goto out;
		}

		buffer->bin_buffer = vmalloc(len);
		if (buffer->bin_buffer == NULL) {
		retval = -ENOMEM;
		goto out;
		}
		buffer->bin_buffer_size = len;

		/* perform second read to fill buffer */
		len = bin_attr->read(item, buffer->bin_buffer, len);
		if (len < 0) {
		retval = len;
		vfree(buffer->bin_buffer);
		buffer->bin_buffer_size = 0;
		buffer->bin_buffer = NULL;
		goto out;
		}

		buffer->needs_read_fill = 0;
		}

		retval = simple_read_from_buffer(buf, count, ppos, buffer->bin_buffer,
		buffer->bin_buffer_size);
		out:
		mutex_unlock(&buffer->mutex);
		return retval;
		}


		/**
		* fill_write_buffer - copy buffer from userspace.
		@@ -209,10 +295,80 @@ configfs_write_file(struct file file, const char __user buf, size_t count, lof
		return len;
		}

		static int check_perm(struct inode * inode, struct file * file)
		/**
		* configfs_write_bin_file - write a binary attribute.
		* @file: file pointer
		* @buf: data to write
		* @count: number of bytes
		* @ppos: starting offset
		*
		* Writing to a binary attribute file is similar to a normal read.
		* We buffer the consecutive writes (binary attribute files do not
		* support lseek) in a continuously growing buffer, but we don't
		* commit until the close of the file.
		*/

		static ssize_t
		configfs_write_bin_file(struct file file, const char __user buf,
		size_t count, loff_t *ppos)
		{
		struct configfs_buffer *buffer = file->private_data;
		struct dentry *dentry = file->f_path.dentry;
		struct configfs_bin_attribute *bin_attr = to_bin_attr(dentry);
		void *tbuf = NULL;
		ssize_t len;

		mutex_lock(&buffer->mutex);

		/* we don't support switching read/write modes */
		if (buffer->read_in_progress) {
		len = -ETXTBSY;
		goto out;
		}
		buffer->write_in_progress = 1;

		/* buffer grows? */
		if (*ppos + count > buffer->bin_buffer_size) {

		if (bin_attr->cb_max_size &&
		*ppos + count > bin_attr->cb_max_size) {
		len = -EFBIG;
		}

		tbuf = vmalloc(*ppos + count);
		if (tbuf == NULL) {
		len = -ENOMEM;
		goto out;
		}

		/* copy old contents */
		if (buffer->bin_buffer) {
		memcpy(tbuf, buffer->bin_buffer,
		buffer->bin_buffer_size);
		vfree(buffer->bin_buffer);
		}

		/* clear the new area */
		memset(tbuf + buffer->bin_buffer_size, 0,
		*ppos + count - buffer->bin_buffer_size);
		buffer->bin_buffer = tbuf;
		buffer->bin_buffer_size = *ppos + count;
		}

		len = simple_write_to_buffer(buffer->bin_buffer,
		buffer->bin_buffer_size, ppos, buf, count);
		if (len > 0)
		*ppos += len;
		out:
		mutex_unlock(&buffer->mutex);
		return len;
		}

		static int check_perm(struct inode * inode, struct file * file, int type)
		{
		struct config_item *item = configfs_get_config_item(file->f_path.dentry->d_parent);
		struct configfs_attribute * attr = to_attr(file->f_path.dentry);
		struct configfs_bin_attribute *bin_attr = NULL;
		struct configfs_buffer * buffer;
		struct configfs_item_operations * ops = NULL;
		int error = 0;
		@@ -220,6 +376,9 @@ static int check_perm(struct inode * inode, struct file * file)
		if (!item \|\| !attr)
		goto Einval;

		if (type & CONFIGFS_ITEM_BIN_ATTR)
		bin_attr = to_bin_attr(file->f_path.dentry);

		/* Grab the module reference for this attribute if we have one */
		if (!try_module_get(attr->ca_owner)) {
		error = -ENODEV;
		@@ -236,9 +395,14 @@ static int check_perm(struct inode * inode, struct file * file)
		* and we must have a store method.
		*/
		if (file->f_mode & FMODE_WRITE) {
		if (!(inode->i_mode & S_IWUGO) \|\| !attr->store)
		if (!(inode->i_mode & S_IWUGO))
		goto Eaccess;

		if ((type & CONFIGFS_ITEM_ATTR) && !attr->store)
		goto Eaccess;

		if ((type & CONFIGFS_ITEM_BIN_ATTR) && !bin_attr->write)
		goto Eaccess;
		}

		/* File needs read support.
		@@ -246,7 +410,13 @@ static int check_perm(struct inode * inode, struct file * file)
		* must be a show method for it.
		*/
		if (file->f_mode & FMODE_READ) {
		if (!(inode->i_mode & S_IRUGO) \|\| !attr->show)
		if (!(inode->i_mode & S_IRUGO))
		goto Eaccess;

		if ((type & CONFIGFS_ITEM_ATTR) && !attr->show)
		goto Eaccess;

		if ((type & CONFIGFS_ITEM_BIN_ATTR) && !bin_attr->read)
		goto Eaccess;
		}

		@@ -260,6 +430,8 @@ static int check_perm(struct inode * inode, struct file * file)
		}
		mutex_init(&buffer->mutex);
		buffer->needs_read_fill = 1;
		buffer->read_in_progress = 0;
		buffer->write_in_progress = 0;
		buffer->ops = ops;
		file->private_data = buffer;
		goto Done;
		@@ -277,11 +449,6 @@ static int check_perm(struct inode * inode, struct file * file)
		return error;
		}

		static int configfs_open_file(struct inode * inode, struct file * filp)
		{
		return check_perm(inode,filp);
		}

		static int configfs_release(struct inode inode, struct file filp)
		{
		struct config_item * item = to_item(filp->f_path.dentry->d_parent);
		@@ -303,6 +470,47 @@ static int configfs_release(struct inode * inode, struct file * filp)
		return 0;
		}

		static int configfs_open_file(struct inode inode, struct file filp)
		{
		return check_perm(inode, filp, CONFIGFS_ITEM_ATTR);
		}

		static int configfs_open_bin_file(struct inode inode, struct file filp)
		{
		return check_perm(inode, filp, CONFIGFS_ITEM_BIN_ATTR);
		}

		static int configfs_release_bin_file(struct inode inode, struct file filp)
		{
		struct configfs_buffer *buffer = filp->private_data;
		struct dentry *dentry = filp->f_path.dentry;
		struct config_item *item = to_item(dentry->d_parent);
		struct configfs_bin_attribute *bin_attr = to_bin_attr(dentry);
		ssize_t len = 0;
		int ret;

		buffer->read_in_progress = 0;

		if (buffer->write_in_progress) {
		buffer->write_in_progress = 0;

		len = bin_attr->write(item, buffer->bin_buffer,
		buffer->bin_buffer_size);

		/* vfree on NULL is safe */
		vfree(buffer->bin_buffer);
		buffer->bin_buffer = NULL;
		buffer->bin_buffer_size = 0;
		buffer->needs_read_fill = 1;
		}

		ret = configfs_release(inode, filp);
		if (len < 0)
		return len;
		return ret;
		}


		const struct file_operations configfs_file_operations = {
		.read = configfs_read_file,
		.write = configfs_write_file,
		@@ -311,6 +519,14 @@ const struct file_operations configfs_file_operations = {
		.release = configfs_release,
		};

		const struct file_operations configfs_bin_file_operations = {
		.read = configfs_read_bin_file,
		.write = configfs_write_bin_file,
		.llseek = NULL, /* bin file is not seekable */
		.open = configfs_open_bin_file,
		.release = configfs_release_bin_file,
		};

		/**
		* configfs_create_file - create an attribute file for an item.
		* @item: item we're creating for.
		@@ -332,3 +548,24 @@ int configfs_create_file(struct config_item * item, const struct configfs_attrib
		return error;
		}

		/**
		* configfs_create_bin_file - create a binary attribute file for an item.
		* @item: item we're creating for.
		* @attr: atrribute descriptor.
		*/

		int configfs_create_bin_file(struct config_item *item,
		const struct configfs_bin_attribute *bin_attr)
		{
		struct dentry *dir = item->ci_dentry;
		struct configfs_dirent *parent_sd = dir->d_fsdata;
		umode_t mode = (bin_attr->cb_attr.ca_mode & S_IALLUGO) \| S_IFREG;
		int error = 0;

		mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_NORMAL);
		error = configfs_make_dirent(parent_sd, NULL, (void *) bin_attr, mode,
		CONFIGFS_ITEM_BIN_ATTR);
		mutex_unlock(&dir->d_inode->i_mutex);

		return error;
		}

fs/configfs/inode.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -218,7 +218,7 @@ const unsigned char * configfs_get_name(struct configfs_dirent *sd)
		if (sd->s_type & (CONFIGFS_DIR \| CONFIGFS_ITEM_LINK))
		return sd->s_dentry->d_name.name;

		if (sd->s_type & CONFIGFS_ITEM_ATTR) {
		if (sd->s_type & (CONFIGFS_ITEM_ATTR \| CONFIGFS_ITEM_BIN_ATTR)) {
		attr = sd->s_element;
		return attr->ca_name;
		}

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