xattr.c | Explore in Territory

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 */

#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/xattr.h>
#include <linux/gfs2_ondisk.h>
#include <linux/posix_acl_xattr.h>
#include <linux/uaccess.h>

#include "gfs2.h"
#include "incore.h"
#include "acl.h"
#include "xattr.h"
#include "glock.h"
#include "inode.h"
#include "meta_io.h"
#include "quota.h"
#include "rgrp.h"
#include "super.h"
#include "trans.h"
#include "util.h"

/*
 * ea_calc_size - returns the actual number of bytes the request will take up
 *                (not counting any unstuffed data blocks)
 *
 * Returns: 1 if the EA should be stuffed
 */

static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
			unsigned int *size)
{ … }

static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
{ … }

static bool gfs2_eatype_valid(struct gfs2_sbd *sdp, u8 type)
{ … }

ea_call_t;

static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
			ea_call_t ea_call, void *data)
{ … }

static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
{ … }

struct ea_find { … };

static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
		     struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
		     void *private)
{ … }

static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
			struct gfs2_ea_location *el)
{ … }

/*
 * ea_dealloc_unstuffed
 *
 * Take advantage of the fact that all unstuffed blocks are
 * allocated from the same RG.  But watch, this may not always
 * be true.
 *
 * Returns: errno
 */

static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
				struct gfs2_ea_header *ea,
				struct gfs2_ea_header *prev, void *private)
{ … }

static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
			       struct gfs2_ea_header *ea,
			       struct gfs2_ea_header *prev, int leave)
{ … }

struct ea_list { … };

static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
		     struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
		     void *private)
{ … }

/**
 * gfs2_listxattr - List gfs2 extended attributes
 * @dentry: The dentry whose inode we are interested in
 * @buffer: The buffer to write the results
 * @size: The size of the buffer
 *
 * Returns: actual size of data on success, -errno on error
 */

ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
{ … }

/**
 * gfs2_iter_unstuffed - copies the unstuffed xattr data to/from the
 *                       request buffer
 * @ip: The GFS2 inode
 * @ea: The extended attribute header structure
 * @din: The data to be copied in
 * @dout: The data to be copied out (one of din,dout will be NULL)
 *
 * Returns: errno
 */

static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
			       const char *din, char *dout)
{ … }

static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
			    char *data, size_t size)
{ … }

int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
{ … }

/**
 * __gfs2_xattr_get - Get a GFS2 extended attribute
 * @inode: The inode
 * @name: The name of the extended attribute
 * @buffer: The buffer to write the result into
 * @size: The size of the buffer
 * @type: The type of extended attribute
 *
 * Returns: actual size of data on success, -errno on error
 */
static int __gfs2_xattr_get(struct inode *inode, const char *name,
			    void *buffer, size_t size, int type)
{ … }

static int gfs2_xattr_get(const struct xattr_handler *handler,
			  struct dentry *unused, struct inode *inode,
			  const char *name, void *buffer, size_t size)
{ … }

/**
 * ea_alloc_blk - allocates a new block for extended attributes.
 * @ip: A pointer to the inode that's getting extended attributes
 * @bhp: Pointer to pointer to a struct buffer_head
 *
 * Returns: errno
 */

static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
{ … }

/**
 * ea_write - writes the request info to an ea, creating new blocks if
 *            necessary
 * @ip: inode that is being modified
 * @ea: the location of the new ea in a block
 * @er: the write request
 *
 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 *
 * returns : errno
 */

static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
		    struct gfs2_ea_request *er)
{ … }

ea_skeleton_call_t;

static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
			     unsigned int blks,
			     ea_skeleton_call_t skeleton_call, void *private)
{ … }

static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
		     void *private)
{ … }

/*
 * ea_init - initializes a new eattr block
 *
 * Returns: errno
 */
static int ea_init(struct gfs2_inode *ip, int type, const char *name,
		   const void *data, size_t size)
{ … }

static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
{ … }

static void ea_set_remove_stuffed(struct gfs2_inode *ip,
				  struct gfs2_ea_location *el)
{ … }

struct ea_set { … };

static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
				 struct gfs2_ea_header *ea, struct ea_set *es)
{ … }

static int ea_set_simple_alloc(struct gfs2_inode *ip,
			       struct gfs2_ea_request *er, void *private)
{ … }

static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
			 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
			 void *private)
{ … }

static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
			void *private)
{ … }

static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
		    const void *value, size_t size, struct gfs2_ea_location *el)
{ … }

static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
				   struct gfs2_ea_location *el)
{ … }

static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
{ … }

/**
 * gfs2_xattr_remove - Remove a GFS2 extended attribute
 * @ip: The inode
 * @type: The type of the extended attribute
 * @name: The name of the extended attribute
 *
 * This is not called directly by the VFS since we use the (common)
 * scheme of making a "set with NULL data" mean a remove request. Note
 * that this is different from a set with zero length data.
 *
 * Returns: 0, or errno on failure
 */

static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
{ … }

/**
 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
 * @inode: The inode
 * @name: The name of the extended attribute
 * @value: The value of the extended attribute (NULL for remove)
 * @size: The size of the @value argument
 * @flags: Create or Replace
 * @type: The type of the extended attribute
 *
 * See gfs2_xattr_remove() for details of the removal of xattrs.
 *
 * Returns: 0 or errno on failure
 */

int __gfs2_xattr_set(struct inode *inode, const char *name,
		   const void *value, size_t size, int flags, int type)
{ … }

static int gfs2_xattr_set(const struct xattr_handler *handler,
			  struct mnt_idmap *idmap,
			  struct dentry *unused, struct inode *inode,
			  const char *name, const void *value,
			  size_t size, int flags)
{ … }

static int ea_dealloc_indirect(struct gfs2_inode *ip)
{ … }

static int ea_dealloc_block(struct gfs2_inode *ip)
{ … }

/**
 * gfs2_ea_dealloc - deallocate the extended attribute fork
 * @ip: the inode
 *
 * Returns: errno
 */

int gfs2_ea_dealloc(struct gfs2_inode *ip)
{ … }

static const struct xattr_handler gfs2_xattr_user_handler = …;

static const struct xattr_handler gfs2_xattr_security_handler = …;

static bool
gfs2_xattr_trusted_list(struct dentry *dentry)
{ … }

static const struct xattr_handler gfs2_xattr_trusted_handler = …;

const struct xattr_handler * const gfs2_xattr_handlers_max[] = …;

const struct xattr_handler * const *gfs2_xattr_handlers_min = …;
linux/fs/gfs2/xattr.c
