Commit 431547b3 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Al Viro
Browse files

sanitize xattr handler prototypes 



Add a flags argument to struct xattr_handler and pass it to all xattr
handler methods.  This allows using the same methods for multiple
handlers, e.g. for the ACL methods which perform exactly the same action
for the access and default ACLs, just using a different underlying
attribute.  With a little more groundwork it'll also allow sharing the
methods for the regular user/trusted/secure handlers in extN, ocfs2 and
jffs2 like it's already done for xfs in this patch.

Also change the inode argument to the handlers to a dentry to allow
using the handlers mechnism for filesystems that require it later,
e.g. cifs.

[with GFS2 bits updated by Steven Whitehouse <swhiteho@redhat.com>]

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarJames Morris <jmorris@namei.org>
Acked-by: default avatarJoel Becker <joel.becker@oracle.com>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent ef26ca97

fs/btrfs/acl.c

+12 −35
Original line number Diff line number Diff line
@@ -73,13 +73,13 @@ static struct posix_acl *btrfs_get_acl(struct inode *inode, int type) 
	return acl;

}



static int btrfs_xattr_get_acl(struct inode *inode, int type,

			       void *value, size_t size)

static int btrfs_xattr_acl_get(struct dentry *dentry, const char *name,

		void *value, size_t size, int type)

{

	struct posix_acl *acl;

	int ret = 0;



	acl = btrfs_get_acl(inode, type);

	acl = btrfs_get_acl(dentry->d_inode, type);



	if (IS_ERR(acl))

		return PTR_ERR(acl);
@@ -151,8 +151,8 @@ out: 
	return ret;

}



static int btrfs_xattr_set_acl(struct inode *inode, int type,

			       const void *value, size_t size)

static int btrfs_xattr_acl_set(struct dentry *dentry, const char *name,

		const void *value, size_t size, int flags, int type)

{

	int ret = 0;

	struct posix_acl *acl = NULL;
@@ -167,38 +167,13 @@ static int btrfs_xattr_set_acl(struct inode *inode, int type, 
		}

	}



	ret = btrfs_set_acl(inode, acl, type);

	ret = btrfs_set_acl(dentry->d_inode, acl, type);



	posix_acl_release(acl);



	return ret;

}





static int btrfs_xattr_acl_access_get(struct inode *inode, const char *name,

				      void *value, size_t size)

{

	return btrfs_xattr_get_acl(inode, ACL_TYPE_ACCESS, value, size);

}



static int btrfs_xattr_acl_access_set(struct inode *inode, const char *name,

				      const void *value, size_t size, int flags)

{

	return btrfs_xattr_set_acl(inode, ACL_TYPE_ACCESS, value, size);

}



static int btrfs_xattr_acl_default_get(struct inode *inode, const char *name,

				       void *value, size_t size)

{

	return btrfs_xattr_get_acl(inode, ACL_TYPE_DEFAULT, value, size);

}



static int btrfs_xattr_acl_default_set(struct inode *inode, const char *name,

			       const void *value, size_t size, int flags)

{

	return btrfs_xattr_set_acl(inode, ACL_TYPE_DEFAULT, value, size);

}



int btrfs_check_acl(struct inode *inode, int mask)

{

	struct posix_acl *acl;
@@ -303,14 +278,16 @@ int btrfs_acl_chmod(struct inode *inode) 


struct xattr_handler btrfs_xattr_acl_default_handler = {

	.prefix = POSIX_ACL_XATTR_DEFAULT,

	.get	= btrfs_xattr_acl_default_get,

	.set	= btrfs_xattr_acl_default_set,

	.flags	= ACL_TYPE_DEFAULT,

	.get	= btrfs_xattr_acl_get,

	.set	= btrfs_xattr_acl_set,

};



struct xattr_handler btrfs_xattr_acl_access_handler = {

	.prefix = POSIX_ACL_XATTR_ACCESS,

	.get	= btrfs_xattr_acl_access_get,

	.set	= btrfs_xattr_acl_access_set,

	.flags	= ACL_TYPE_ACCESS,

	.get	= btrfs_xattr_acl_get,

	.set	= btrfs_xattr_acl_set,

};



#else /* CONFIG_BTRFS_FS_POSIX_ACL */

fs/ext2/acl.c

+25 −54
Original line number Diff line number Diff line
@@ -339,12 +339,12 @@ ext2_acl_chmod(struct inode *inode) 
 * Extended attribut handlers

 */

static size_t

ext2_xattr_list_acl_access(struct inode *inode, char *list, size_t list_size,

			   const char *name, size_t name_len)

ext2_xattr_list_acl_access(struct dentry *dentry, char *list, size_t list_size,

			   const char *name, size_t name_len, int type)

{

	const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);



	if (!test_opt(inode->i_sb, POSIX_ACL))

	if (!test_opt(dentry->d_sb, POSIX_ACL))

		return 0;

	if (list && size <= list_size)

		memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
@@ -352,12 +352,12 @@ ext2_xattr_list_acl_access(struct inode *inode, char *list, size_t list_size, 
}



static size_t

ext2_xattr_list_acl_default(struct inode *inode, char *list, size_t list_size,

			    const char *name, size_t name_len)

ext2_xattr_list_acl_default(struct dentry *dentry, char *list, size_t list_size,

			    const char *name, size_t name_len, int type)

{

	const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);



	if (!test_opt(inode->i_sb, POSIX_ACL))

	if (!test_opt(dentry->d_sb, POSIX_ACL))

		return 0;

	if (list && size <= list_size)

		memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
@@ -365,15 +365,18 @@ ext2_xattr_list_acl_default(struct inode *inode, char *list, size_t list_size, 
}



static int

ext2_xattr_get_acl(struct inode *inode, int type, void *buffer, size_t size)

ext2_xattr_get_acl(struct dentry *dentry, const char *name, void *buffer,

		   size_t size, int type)

{

	struct posix_acl *acl;

	int error;



	if (!test_opt(inode->i_sb, POSIX_ACL))

	if (strcmp(name, "") != 0)

		return -EINVAL;

	if (!test_opt(dentry->d_sb, POSIX_ACL))

		return -EOPNOTSUPP;



	acl = ext2_get_acl(inode, type);

	acl = ext2_get_acl(dentry->d_inode, type);

	if (IS_ERR(acl))

		return PTR_ERR(acl);

	if (acl == NULL)
@@ -385,33 +388,17 @@ ext2_xattr_get_acl(struct inode *inode, int type, void *buffer, size_t size) 
}



static int

ext2_xattr_get_acl_access(struct inode *inode, const char *name,

			  void *buffer, size_t size)

{

	if (strcmp(name, "") != 0)

		return -EINVAL;

	return ext2_xattr_get_acl(inode, ACL_TYPE_ACCESS, buffer, size);

}



static int

ext2_xattr_get_acl_default(struct inode *inode, const char *name,

			   void *buffer, size_t size)

{

	if (strcmp(name, "") != 0)

		return -EINVAL;

	return ext2_xattr_get_acl(inode, ACL_TYPE_DEFAULT, buffer, size);

}



static int

ext2_xattr_set_acl(struct inode *inode, int type, const void *value,

		   size_t size)

ext2_xattr_set_acl(struct dentry *dentry, const char *name, const void *value,

		   size_t size, int flags, int type)

{

	struct posix_acl *acl;

	int error;



	if (!test_opt(inode->i_sb, POSIX_ACL))

	if (strcmp(name, "") != 0)

		return -EINVAL;

	if (!test_opt(dentry->d_sb, POSIX_ACL))

		return -EOPNOTSUPP;

	if (!is_owner_or_cap(inode))

	if (!is_owner_or_cap(dentry->d_inode))

		return -EPERM;



	if (value) {
@@ -426,41 +413,25 @@ ext2_xattr_set_acl(struct inode *inode, int type, const void *value, 
	} else

		acl = NULL;



	error = ext2_set_acl(inode, type, acl);

	error = ext2_set_acl(dentry->d_inode, type, acl);



release_and_out:

	posix_acl_release(acl);

	return error;

}



static int

ext2_xattr_set_acl_access(struct inode *inode, const char *name,

			  const void *value, size_t size, int flags)

{

	if (strcmp(name, "") != 0)

		return -EINVAL;

	return ext2_xattr_set_acl(inode, ACL_TYPE_ACCESS, value, size);

}



static int

ext2_xattr_set_acl_default(struct inode *inode, const char *name,

			   const void *value, size_t size, int flags)

{

	if (strcmp(name, "") != 0)

		return -EINVAL;

	return ext2_xattr_set_acl(inode, ACL_TYPE_DEFAULT, value, size);

}



struct xattr_handler ext2_xattr_acl_access_handler = {

	.prefix	= POSIX_ACL_XATTR_ACCESS,

	.flags	= ACL_TYPE_ACCESS,

	.list	= ext2_xattr_list_acl_access,

	.get	= ext2_xattr_get_acl_access,

	.set	= ext2_xattr_set_acl_access,

	.get	= ext2_xattr_get_acl,

	.set	= ext2_xattr_set_acl,

};



struct xattr_handler ext2_xattr_acl_default_handler = {

	.prefix	= POSIX_ACL_XATTR_DEFAULT,

	.flags	= ACL_TYPE_DEFAULT,

	.list	= ext2_xattr_list_acl_default,

	.get	= ext2_xattr_get_acl_default,

	.set	= ext2_xattr_set_acl_default,

	.get	= ext2_xattr_get_acl,

	.set	= ext2_xattr_set_acl,

};

fs/ext2/xattr.c

+7 −4
Original line number Diff line number Diff line
@@ -60,6 +60,7 @@ 
#include <linux/mbcache.h>

#include <linux/quotaops.h>

#include <linux/rwsem.h>

#include <linux/security.h>

#include "ext2.h"

#include "xattr.h"

#include "acl.h"
@@ -249,8 +250,9 @@ cleanup: 
 * used / required on success.

 */

static int

ext2_xattr_list(struct inode *inode, char *buffer, size_t buffer_size)

ext2_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size)

{

	struct inode *inode = dentry->d_inode;

	struct buffer_head *bh = NULL;

	struct ext2_xattr_entry *entry;

	char *end;
@@ -300,9 +302,10 @@ bad_block: ext2_error(inode->i_sb, "ext2_xattr_list", 
			ext2_xattr_handler(entry->e_name_index);



		if (handler) {

			size_t size = handler->list(inode, buffer, rest,

			size_t size = handler->list(dentry, buffer, rest,

						    entry->e_name,

						    entry->e_name_len);

						    entry->e_name_len,

						    handler->flags);

			if (buffer) {

				if (size > rest) {

					error = -ERANGE;
@@ -330,7 +333,7 @@ cleanup: 
ssize_t

ext2_listxattr(struct dentry *dentry, char *buffer, size_t size)

{

	return ext2_xattr_list(dentry->d_inode, buffer, size);

	return ext2_xattr_list(dentry, buffer, size);

}



/*

fs/ext2/xattr_security.c

+8 −8
Original line number Diff line number Diff line
@@ -11,8 +11,8 @@ 
#include "xattr.h"



static size_t

ext2_xattr_security_list(struct inode *inode, char *list, size_t list_size,

			 const char *name, size_t name_len)

ext2_xattr_security_list(struct dentry *dentry, char *list, size_t list_size,

			 const char *name, size_t name_len, int type)

{

	const int prefix_len = XATTR_SECURITY_PREFIX_LEN;

	const size_t total_len = prefix_len + name_len + 1;
@@ -26,22 +26,22 @@ ext2_xattr_security_list(struct inode *inode, char *list, size_t list_size, 
}



static int

ext2_xattr_security_get(struct inode *inode, const char *name,

		       void *buffer, size_t size)

ext2_xattr_security_get(struct dentry *dentry, const char *name,

		       void *buffer, size_t size, int type)

{

	if (strcmp(name, "") == 0)

		return -EINVAL;

	return ext2_xattr_get(inode, EXT2_XATTR_INDEX_SECURITY, name,

	return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_SECURITY, name,

			      buffer, size);

}



static int

ext2_xattr_security_set(struct inode *inode, const char *name,

		       const void *value, size_t size, int flags)

ext2_xattr_security_set(struct dentry *dentry, const char *name,

		const void *value, size_t size, int flags, int type)

{

	if (strcmp(name, "") == 0)

		return -EINVAL;

	return ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY, name,

	return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_SECURITY, name,

			      value, size, flags);

}

fs/ext2/xattr_trusted.c

+8 −8
Original line number Diff line number Diff line
@@ -13,8 +13,8 @@ 
#include "xattr.h"



static size_t

ext2_xattr_trusted_list(struct inode *inode, char *list, size_t list_size,

			const char *name, size_t name_len)

ext2_xattr_trusted_list(struct dentry *dentry, char *list, size_t list_size,

		const char *name, size_t name_len, int type)

{

	const int prefix_len = XATTR_TRUSTED_PREFIX_LEN;

	const size_t total_len = prefix_len + name_len + 1;
@@ -31,22 +31,22 @@ ext2_xattr_trusted_list(struct inode *inode, char *list, size_t list_size, 
}



static int

ext2_xattr_trusted_get(struct inode *inode, const char *name,

		       void *buffer, size_t size)

ext2_xattr_trusted_get(struct dentry *dentry, const char *name,

		void *buffer, size_t size, int type)

{

	if (strcmp(name, "") == 0)

		return -EINVAL;

	return ext2_xattr_get(inode, EXT2_XATTR_INDEX_TRUSTED, name,

	return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name,

			      buffer, size);

}



static int

ext2_xattr_trusted_set(struct inode *inode, const char *name,

		       const void *value, size_t size, int flags)

ext2_xattr_trusted_set(struct dentry *dentry, const char *name,

		const void *value, size_t size, int flags, int type)

{

	if (strcmp(name, "") == 0)

		return -EINVAL;

	return ext2_xattr_set(inode, EXT2_XATTR_INDEX_TRUSTED, name,

	return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name,

			      value, size, flags);

}

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