C++ posix_acl_release函数代码示例

int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
		       struct ceph_acls_info *info)
{
	struct posix_acl *acl, *default_acl;
	size_t val_size1 = 0, val_size2 = 0;
	struct ceph_pagelist *pagelist = NULL;
	void *tmp_buf = NULL;
	int err;

	err = posix_acl_create(dir, mode, &default_acl, &acl);
	if (err)
		return err;

	if (acl) {
		int ret = posix_acl_equiv_mode(acl, mode);
		if (ret < 0)
			goto out_err;
		if (ret == 0) {
			posix_acl_release(acl);
			acl = NULL;
		}
	}

	if (!default_acl && !acl)
		return 0;

	if (acl)
		val_size1 = posix_acl_xattr_size(acl->a_count);
	if (default_acl)
		val_size2 = posix_acl_xattr_size(default_acl->a_count);

	err = -ENOMEM;
	tmp_buf = kmalloc(max(val_size1, val_size2), GFP_NOFS);
	if (!tmp_buf)
		goto out_err;
	pagelist = kmalloc(sizeof(struct ceph_pagelist), GFP_NOFS);
	if (!pagelist)
		goto out_err;
	ceph_pagelist_init(pagelist);

	err = ceph_pagelist_reserve(pagelist, PAGE_SIZE);
	if (err)
		goto out_err;

	ceph_pagelist_encode_32(pagelist, acl && default_acl ? 2 : 1);

	if (acl) {
		size_t len = strlen(POSIX_ACL_XATTR_ACCESS);
		err = ceph_pagelist_reserve(pagelist, len + val_size1 + 8);
		if (err)
			goto out_err;
		ceph_pagelist_encode_string(pagelist, POSIX_ACL_XATTR_ACCESS,
					    len);
		err = posix_acl_to_xattr(&init_user_ns, acl,
					 tmp_buf, val_size1);
		if (err < 0)
			goto out_err;
		ceph_pagelist_encode_32(pagelist, val_size1);
		ceph_pagelist_append(pagelist, tmp_buf, val_size1);
	}
	if (default_acl) {
		size_t len = strlen(POSIX_ACL_XATTR_DEFAULT);
		err = ceph_pagelist_reserve(pagelist, len + val_size2 + 8);
		if (err)
			goto out_err;
		err = ceph_pagelist_encode_string(pagelist,
						  POSIX_ACL_XATTR_DEFAULT, len);
		err = posix_acl_to_xattr(&init_user_ns, default_acl,
					 tmp_buf, val_size2);
		if (err < 0)
			goto out_err;
		ceph_pagelist_encode_32(pagelist, val_size2);
		ceph_pagelist_append(pagelist, tmp_buf, val_size2);
	}

	kfree(tmp_buf);

	info->acl = acl;
	info->default_acl = default_acl;
	info->pagelist = pagelist;
	return 0;

out_err:
	posix_acl_release(acl);
	posix_acl_release(default_acl);
	kfree(tmp_buf);
	if (pagelist)
		ceph_pagelist_release(pagelist);
	return err;
}

//.........这里部分代码省略.........
		goto fail_free_inode;

	ip->i_gl->gl_object = ip;
	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
	if (error)
		goto fail_free_inode;

	error = gfs2_trans_begin(sdp, blocks, 0);
	if (error)
		goto fail_gunlock2;

	if (blocks > 1) {
		ip->i_eattr = ip->i_no_addr + 1;
		gfs2_init_xattr(ip);
	}
	init_dinode(dip, ip, symname);
	gfs2_trans_end(sdp);

	error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
	if (error)
		goto fail_gunlock2;

	error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
	if (error)
		goto fail_gunlock2;

	ip->i_iopen_gh.gh_gl->gl_object = ip;
	gfs2_glock_put(io_gl);
	gfs2_set_iop(inode);
	insert_inode_hash(inode);

	if (default_acl) {
		error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
		posix_acl_release(default_acl);
	}
	if (acl) {
		if (!error)
			error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
		posix_acl_release(acl);
	}

	if (error)
		goto fail_gunlock3;

	error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
					     &gfs2_initxattrs, NULL);
	if (error)
		goto fail_gunlock3;

	error = link_dinode(dip, name, ip, &da);
	if (error)
		goto fail_gunlock3;

	mark_inode_dirty(inode);
	d_instantiate(dentry, inode);
	if (file) {
		*opened |= FILE_CREATED;
		error = finish_open(file, dentry, gfs2_open_common, opened);
	}
	gfs2_glock_dq_uninit(ghs);
	gfs2_glock_dq_uninit(ghs + 1);
	return error;

fail_gunlock3:
	gfs2_glock_dq_uninit(ghs + 1);
	if (ip->i_gl)

/*
 * Convert from filesystem to in-memory representation.
 */
static struct posix_acl *
ext2_acl_from_disk(const void *value, size_t size)
{
	const char *end = (char *)value + size;
	int n, count;
	struct posix_acl *acl;

	if (!value)
		return NULL;
	if (size < sizeof(ext2_acl_header))
		 return ERR_PTR(-EINVAL);
	if (((ext2_acl_header *)value)->a_version !=
	    cpu_to_le32(EXT2_ACL_VERSION))
		return ERR_PTR(-EINVAL);
	value = (char *)value + sizeof(ext2_acl_header);
	count = ext2_acl_count(size);
	if (count < 0)
		return ERR_PTR(-EINVAL);
	if (count == 0)
		return NULL;
	acl = posix_acl_alloc(count, GFP_KERNEL);
	if (!acl)
		return ERR_PTR(-ENOMEM);
	for (n=0; n < count; n++) {
		ext2_acl_entry *entry =
			(ext2_acl_entry *)value;
		if ((char *)value + sizeof(ext2_acl_entry_short) > end)
			goto fail;
		acl->a_entries[n].e_tag  = le16_to_cpu(entry->e_tag);
		acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
		switch(acl->a_entries[n].e_tag) {
			case ACL_USER_OBJ:
			case ACL_GROUP_OBJ:
			case ACL_MASK:
			case ACL_OTHER:
				value = (char *)value +
					sizeof(ext2_acl_entry_short);
				acl->a_entries[n].e_id = ACL_UNDEFINED_ID;
				break;

			case ACL_USER:
			case ACL_GROUP:
				value = (char *)value + sizeof(ext2_acl_entry);
				if ((char *)value > end)
					goto fail;
				acl->a_entries[n].e_id =
					le32_to_cpu(entry->e_id);
				break;

			default:
				goto fail;
		}
	}
	if (value != end)
		goto fail;
	return acl;

fail:
	posix_acl_release(acl);
	return ERR_PTR(-EINVAL);
}

/*
 * Create a regular file.
 */
static int
nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
		 int flags)
{
	struct posix_acl *default_acl, *acl;
	struct nfs3_createdata *data;
	int status = -ENOMEM;

	dprintk("NFS call  create %pd\n", dentry);

	data = nfs3_alloc_createdata();
	if (data == NULL)
		goto out;

	data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_CREATE];
	data->arg.create.fh = NFS_FH(dir);
	data->arg.create.name = dentry->d_name.name;
	data->arg.create.len = dentry->d_name.len;
	data->arg.create.sattr = sattr;

	data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
	if (flags & O_EXCL) {
		data->arg.create.createmode  = NFS3_CREATE_EXCLUSIVE;
		data->arg.create.verifier[0] = cpu_to_be32(jiffies);
		data->arg.create.verifier[1] = cpu_to_be32(current->pid);
	}

	status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
	if (status)
		goto out;

	for (;;) {
		status = nfs3_do_create(dir, dentry, data);

		if (status != -ENOTSUPP)
			break;
		/* If the server doesn't support the exclusive creation
		 * semantics, try again with simple 'guarded' mode. */
		switch (data->arg.create.createmode) {
			case NFS3_CREATE_EXCLUSIVE:
				data->arg.create.createmode = NFS3_CREATE_GUARDED;
				break;

			case NFS3_CREATE_GUARDED:
				data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
				break;

			case NFS3_CREATE_UNCHECKED:
				goto out;
		}
		nfs_fattr_init(data->res.dir_attr);
		nfs_fattr_init(data->res.fattr);
	}

	if (status != 0)
		goto out_release_acls;

	/* When we created the file with exclusive semantics, make
	 * sure we set the attributes afterwards. */
	if (data->arg.create.createmode == NFS3_CREATE_EXCLUSIVE) {
		dprintk("NFS call  setattr (post-create)\n");

		if (!(sattr->ia_valid & ATTR_ATIME_SET))
			sattr->ia_valid |= ATTR_ATIME;
		if (!(sattr->ia_valid & ATTR_MTIME_SET))
			sattr->ia_valid |= ATTR_MTIME;

		/* Note: we could use a guarded setattr here, but I'm
		 * not sure this buys us anything (and I'd have
		 * to revamp the NFSv3 XDR code) */
		status = nfs3_proc_setattr(dentry, data->res.fattr, sattr);
		nfs_post_op_update_inode(dentry->d_inode, data->res.fattr);
		dprintk("NFS reply setattr (post-create): %d\n", status);
		if (status != 0)
			goto out_release_acls;
	}

	status = nfs3_proc_setacls(dentry->d_inode, acl, default_acl);

out_release_acls:
	posix_acl_release(acl);
	posix_acl_release(default_acl);
out:
	nfs3_free_createdata(data);
	dprintk("NFS reply create: %d\n", status);
	return status;
}

//.........这里部分代码省略.........
	error = gfs2_trans_begin(sdp, blocks, 0);
	if (error)
		goto fail_gunlock2;

	if (blocks > 1) {
		ip->i_eattr = ip->i_no_addr + 1;
		gfs2_init_xattr(ip);
	}
	init_dinode(dip, ip, symname);
	gfs2_trans_end(sdp);

	error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
	if (error)
		goto fail_gunlock2;

	BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags));

	error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
	if (error)
		goto fail_gunlock2;

	glock_set_object(ip->i_iopen_gh.gh_gl, ip);
	gfs2_glock_put(io_gl);
	gfs2_set_iop(inode);
	insert_inode_hash(inode);

	free_vfs_inode = 0; /* After this point, the inode is no longer
			       considered free. Any failures need to undo
			       the gfs2 structures. */
	if (default_acl) {
		error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
		if (error)
			goto fail_gunlock3;
		posix_acl_release(default_acl);
		default_acl = NULL;
	}
	if (acl) {
		error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
		if (error)
			goto fail_gunlock3;
		posix_acl_release(acl);
		acl = NULL;
	}

	error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
					     &gfs2_initxattrs, NULL);
	if (error)
		goto fail_gunlock3;

	error = link_dinode(dip, name, ip, &da);
	if (error)
		goto fail_gunlock3;

	mark_inode_dirty(inode);
	d_instantiate(dentry, inode);
	if (file) {
		file->f_mode |= FMODE_CREATED;
		error = finish_open(file, dentry, gfs2_open_common);
	}
	gfs2_glock_dq_uninit(ghs);
	gfs2_glock_dq_uninit(ghs + 1);
	clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
	return error;

fail_gunlock3:
	glock_clear_object(io_gl, ip);

STATIC int
xfs_vn_mknod(
	struct inode	*dir,
	struct dentry	*dentry,
	int		mode,
	dev_t		rdev)
{
	struct inode	*inode;
	struct xfs_inode *ip = NULL;
	struct posix_acl *default_acl = NULL;
	struct xfs_name	name;
	int		error;

	/*
	 * Irix uses Missed'em'V split, but doesn't want to see
	 * the upper 5 bits of (14bit) major.
	 */
	if (S_ISCHR(mode) || S_ISBLK(mode)) {
		if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
			return -EINVAL;
		rdev = sysv_encode_dev(rdev);
	} else {
		rdev = 0;
	}

	if (IS_POSIXACL(dir)) {
		default_acl = xfs_get_acl(dir, ACL_TYPE_DEFAULT);
		if (IS_ERR(default_acl))
			return PTR_ERR(default_acl);

		if (!default_acl)
			mode &= ~current_umask();
	}

	xfs_dentry_to_name(&name, dentry);
	error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip);
	if (unlikely(error))
		goto out_free_acl;

	inode = VFS_I(ip);

	error = xfs_init_security(inode, dir, &dentry->d_name);
	if (unlikely(error))
		goto out_cleanup_inode;

	if (default_acl) {
		error = -xfs_inherit_acl(inode, default_acl);
		default_acl = NULL;
		if (unlikely(error))
			goto out_cleanup_inode;
	}


	d_instantiate(dentry, inode);
	return -error;

 out_cleanup_inode:
	xfs_cleanup_inode(dir, inode, dentry);
 out_free_acl:
	posix_acl_release(default_acl);
	return -error;
}

/*
 * Initialize the ACLs of a new inode. If parent directory has default ACL,
 * then clone to new inode. Called from ocfs2_mknod.
 */
int ocfs2_init_acl(handle_t *handle,
		   struct inode *inode,
		   struct inode *dir,
		   struct buffer_head *di_bh,
		   struct buffer_head *dir_bh,
		   struct ocfs2_alloc_context *meta_ac,
		   struct ocfs2_alloc_context *data_ac)
{
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct posix_acl *acl = NULL;
	int ret = 0, ret2;
	mode_t mode;

	if (!S_ISLNK(inode->i_mode)) {
		if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
			acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT,
						   dir_bh);
			if (IS_ERR(acl))
				return PTR_ERR(acl);
		}
		if (!acl) {
			mode = inode->i_mode & ~current_umask();
			ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
			if (ret) {
				mlog_errno(ret);
				goto cleanup;
			}
		}
	}
	if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) {
		struct posix_acl *clone;

		if (S_ISDIR(inode->i_mode)) {
			ret = ocfs2_set_acl(handle, inode, di_bh,
					    ACL_TYPE_DEFAULT, acl,
					    meta_ac, data_ac);
			if (ret)
				goto cleanup;
		}
		clone = posix_acl_clone(acl, GFP_NOFS);
		ret = -ENOMEM;
		if (!clone)
			goto cleanup;

		mode = inode->i_mode;
		ret = posix_acl_create_masq(clone, &mode);
		if (ret >= 0) {
			ret2 = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
			if (ret2) {
				mlog_errno(ret2);
				ret = ret2;
				goto cleanup;
			}
			if (ret > 0) {
				ret = ocfs2_set_acl(handle, inode,
						    di_bh, ACL_TYPE_ACCESS,
						    clone, meta_ac, data_ac);
			}
		}
		posix_acl_release(clone);
	}
cleanup:
	posix_acl_release(acl);
	return ret;
}

void v9fs_put_acl(struct posix_acl *dacl,
		  struct posix_acl *acl)
{
	posix_acl_release(dacl);
	posix_acl_release(acl);
}

struct posix_acl *get_acl(struct inode *inode, int type)
{
	void *sentinel;
	struct posix_acl **p;
	struct posix_acl *acl;

	/*
	 * The sentinel is used to detect when another operation like
	 * set_cached_acl() or forget_cached_acl() races with get_acl().
	 * It is guaranteed that is_uncached_acl(sentinel) is true.
	 */

	acl = get_cached_acl(inode, type);
	if (!is_uncached_acl(acl))
		return acl;

	if (!IS_POSIXACL(inode))
		return NULL;

	sentinel = uncached_acl_sentinel(current);
	p = acl_by_type(inode, type);

	/*
	 * If the ACL isn't being read yet, set our sentinel.  Otherwise, the
	 * current value of the ACL will not be ACL_NOT_CACHED and so our own
	 * sentinel will not be set; another task will update the cache.  We
	 * could wait for that other task to complete its job, but it's easier
	 * to just call ->get_acl to fetch the ACL ourself.  (This is going to
	 * be an unlikely race.)
	 */
	if (cmpxchg(p, ACL_NOT_CACHED, sentinel) != ACL_NOT_CACHED)
		/* fall through */ ;

	/*
	 * Normally, the ACL returned by ->get_acl will be cached.
	 * A filesystem can prevent that by calling
	 * forget_cached_acl(inode, type) in ->get_acl.
	 *
	 * If the filesystem doesn't have a get_acl() function at all, we'll
	 * just create the negative cache entry.
	 */
	if (!inode->i_op->get_acl) {
		set_cached_acl(inode, type, NULL);
		return NULL;
	}
	acl = inode->i_op->get_acl(inode, type);

	if (IS_ERR(acl)) {
		/*
		 * Remove our sentinel so that we don't block future attempts
		 * to cache the ACL.
		 */
		cmpxchg(p, sentinel, ACL_NOT_CACHED);
		return acl;
	}

	/*
	 * Cache the result, but only if our sentinel is still in place.
	 */
	posix_acl_dup(acl);
	if (unlikely(cmpxchg(p, sentinel, acl) != sentinel))
		posix_acl_release(acl);
	return acl;
}

/*
 * inode->i_sem: down, or inode is just being initialized
 * BKL: held
 */
static int
ext3_do_set_acl(handle_t *handle, struct inode *inode, int type,
		struct posix_acl *acl)
{
	struct ext3_inode_info *ei = EXT3_I(inode);
	int name_index;
	void *value = NULL;
	size_t size;
	int error;

	if (S_ISLNK(inode->i_mode))
		return -ENODATA;

	switch(type) {
		case ACL_TYPE_ACCESS:
			name_index = EXT3_XATTR_INDEX_POSIX_ACL_ACCESS;
			if (acl) {
				mode_t mode = inode->i_mode;
				error = posix_acl_equiv_mode(acl, &mode);
				if (error < 0)
					return error;
				else {
					inode->i_mode = mode;
					ext3_mark_inode_dirty(handle, inode);
					if (error == 0)
						acl = NULL;
				}
			}
			break;

		case ACL_TYPE_DEFAULT:
			name_index = EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT;
			if (!S_ISDIR(inode->i_mode))
				return acl ? -EACCES : 0;
			break;

		default:
			return -EINVAL;
	}
 	if (acl) {
		if (acl->a_count > EXT3_ACL_MAX_ENTRIES)
			return -EINVAL;
		value = ext3_acl_to_disk(acl, &size);
		if (IS_ERR(value))
			return (int)PTR_ERR(value);
	}

	error = ext3_xattr_set_handle(handle, inode, name_index, "",
				      value, size, 0);

	if (value)
		kfree(value);
	if (!error) {
		switch(type) {
			case ACL_TYPE_ACCESS:
				if (ei->i_acl != EXT3_ACL_NOT_CACHED)
					posix_acl_release(ei->i_acl);
				ei->i_acl = posix_acl_dup(acl);
				break;

			case ACL_TYPE_DEFAULT:
				if (ei->i_default_acl != EXT3_ACL_NOT_CACHED)
					posix_acl_release(ei->i_default_acl);
				ei->i_default_acl = posix_acl_dup(acl);
				break;
		}
	}
	return error;
}

/* dir->i_mutex: locked,
 * inode is new and not released into the wild yet */
int
reiserfs_inherit_default_acl(struct inode *dir, struct dentry *dentry,
                 struct inode *inode)
{
    struct posix_acl *acl;
    int err = 0;

    /* ACLs only get applied to files and directories */
    if (S_ISLNK(inode->i_mode))
        return 0;

    /* ACLs can only be used on "new" objects, so if it's an old object
     * there is nothing to inherit from */
    if (get_inode_sd_version(dir) == STAT_DATA_V1)
        goto apply_umask;

    /* Don't apply ACLs to objects in the .reiserfs_priv tree.. This
     * would be useless since permissions are ignored, and a pain because
     * it introduces locking cycles */
    if (is_reiserfs_priv_object(dir)) {
        reiserfs_mark_inode_private(inode);
        goto apply_umask;
    }

    acl = reiserfs_get_acl(dir, ACL_TYPE_DEFAULT);
    if (IS_ERR(acl)) {
        if (PTR_ERR(acl) == -ENODATA)
            goto apply_umask;
        return PTR_ERR(acl);
    }

    if (acl) {
        struct posix_acl *acl_copy;
        mode_t mode = inode->i_mode;
        int need_acl;

        /* Copy the default ACL to the default ACL of a new directory */
        if (S_ISDIR(inode->i_mode)) {
            err = reiserfs_set_acl(inode, ACL_TYPE_DEFAULT, acl);
            if (err)
                goto cleanup;
        }

        /* Now we reconcile the new ACL and the mode,
           potentially modifying both */
        acl_copy = posix_acl_clone(acl, GFP_NOFS);
        if (!acl_copy) {
            err = -ENOMEM;
            goto cleanup;
        }

        need_acl = posix_acl_create_masq(acl_copy, &mode);
        if (need_acl >= 0) {
            if (mode != inode->i_mode) {
                inode->i_mode = mode;
            }

            /* If we need an ACL.. */
            if (need_acl > 0) {
                err =
                    reiserfs_set_acl(inode, ACL_TYPE_ACCESS,
                             acl_copy);
                if (err)
                    goto cleanup_copy;
            }
        }
          cleanup_copy:
        posix_acl_release(acl_copy);
          cleanup:
        posix_acl_release(acl);
    } else {
          apply_umask:
        /* no ACL, apply umask */
        inode->i_mode &= ~current->fs->umask;
    }

    return err;
}

/*
 * Inode operation set_posix_acl().
 *
 * inode->i_mutex: down
 * BKL held [before 2.5.x]
 */
static int
reiserfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
{
    char *name;
    void *value = NULL;
    struct posix_acl **p_acl;
    size_t size;
    int error;
    struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);

    if (S_ISLNK(inode->i_mode))
        return -EOPNOTSUPP;

    switch (type) {
    case ACL_TYPE_ACCESS:
        name = POSIX_ACL_XATTR_ACCESS;
        p_acl = &reiserfs_i->i_acl_access;
        if (acl) {
            mode_t mode = inode->i_mode;
            error = posix_acl_equiv_mode(acl, &mode);
            if (error < 0)
                return error;
            else {
                inode->i_mode = mode;
                if (error == 0)
                    acl = NULL;
            }
        }
        break;
    case ACL_TYPE_DEFAULT:
        name = POSIX_ACL_XATTR_DEFAULT;
        p_acl = &reiserfs_i->i_acl_default;
        if (!S_ISDIR(inode->i_mode))
            return acl ? -EACCES : 0;
        break;
    default:
        return -EINVAL;
    }

    if (acl) {
        value = posix_acl_to_disk(acl, &size);
        if (IS_ERR(value))
            return (int)PTR_ERR(value);
        error = reiserfs_xattr_set(inode, name, value, size, 0);
    } else {
        error = reiserfs_xattr_del(inode, name);
        if (error == -ENODATA) {
            /* This may seem odd here, but it means that the ACL was set
             * with a value representable with mode bits. If there was
             * an ACL before, reiserfs_xattr_del already dirtied the inode.
             */
            mark_inode_dirty(inode);
            error = 0;
        }
    }

    kfree(value);

    if (!error) {
        /* Release the old one */
        if (!IS_ERR(*p_acl) && *p_acl)
            posix_acl_release(*p_acl);

        if (acl == NULL)
            *p_acl = ERR_PTR(-ENODATA);
        else
            *p_acl = posix_acl_dup(acl);
    }

    return error;
}

static int
nfs3_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
{
	struct nfs3_linkargs	arg = {
		.fromfh		= NFS_FH(inode),
		.tofh		= NFS_FH(dir),
		.toname		= name->name,
		.tolen		= name->len
	};
	struct nfs3_linkres	res;
	struct rpc_message msg = {
		.rpc_proc	= &nfs3_procedures[NFS3PROC_LINK],
		.rpc_argp	= &arg,
		.rpc_resp	= &res,
	};
	int status = -ENOMEM;

	dprintk("NFS call  link %s\n", name->name);
	res.fattr = nfs_alloc_fattr();
	res.dir_attr = nfs_alloc_fattr();
	if (res.fattr == NULL || res.dir_attr == NULL)
		goto out;

	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
	nfs_post_op_update_inode(dir, res.dir_attr);
	nfs_post_op_update_inode(inode, res.fattr);
out:
	nfs_free_fattr(res.dir_attr);
	nfs_free_fattr(res.fattr);
	dprintk("NFS reply link: %d\n", status);
	return status;
}

static int
nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
		  unsigned int len, struct iattr *sattr)
{
	struct nfs3_createdata *data;
	int status = -ENOMEM;

	if (len > NFS3_MAXPATHLEN)
		return -ENAMETOOLONG;

	dprintk("NFS call  symlink %pd\n", dentry);

	data = nfs3_alloc_createdata();
	if (data == NULL)
		goto out;
	data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK];
	data->arg.symlink.fromfh = NFS_FH(dir);
	data->arg.symlink.fromname = dentry->d_name.name;
	data->arg.symlink.fromlen = dentry->d_name.len;
	data->arg.symlink.pages = &page;
	data->arg.symlink.pathlen = len;
	data->arg.symlink.sattr = sattr;

	status = nfs3_do_create(dir, dentry, data);

	nfs3_free_createdata(data);
out:
	dprintk("NFS reply symlink: %d\n", status);
	return status;
}

static int
nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
{
	struct posix_acl *default_acl, *acl;
	struct nfs3_createdata *data;
	int status = -ENOMEM;

	dprintk("NFS call  mkdir %pd\n", dentry);

	data = nfs3_alloc_createdata();
	if (data == NULL)
		goto out;

	status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
	if (status)
		goto out;

	data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR];
	data->arg.mkdir.fh = NFS_FH(dir);
	data->arg.mkdir.name = dentry->d_name.name;
	data->arg.mkdir.len = dentry->d_name.len;
	data->arg.mkdir.sattr = sattr;

	status = nfs3_do_create(dir, dentry, data);
	if (status != 0)
		goto out_release_acls;

	status = nfs3_proc_setacls(dentry->d_inode, acl, default_acl);

out_release_acls:
	posix_acl_release(acl);
	posix_acl_release(default_acl);
out:
	nfs3_free_createdata(data);
	dprintk("NFS reply mkdir: %d\n", status);
	return status;
//.........这里部分代码省略.........

static struct posix_acl *f2fs_acl_from_disk(const char *value, size_t size)
{
	int i, count;
	struct posix_acl *acl;
	struct f2fs_acl_header *hdr = (struct f2fs_acl_header *)value;
	struct f2fs_acl_entry *entry = (struct f2fs_acl_entry *)(hdr + 1);
	const char *end = value + size;

	if (hdr->a_version != cpu_to_le32(F2FS_ACL_VERSION))
		return ERR_PTR(-EINVAL);

	count = f2fs_acl_count(size);
	if (count < 0)
		return ERR_PTR(-EINVAL);
	if (count == 0)
		return NULL;

	acl = posix_acl_alloc(count, GFP_NOFS);
	if (!acl)
		return ERR_PTR(-ENOMEM);

	for (i = 0; i < count; i++) {

		if ((char *)entry > end)
			goto fail;

		acl->a_entries[i].e_tag  = le16_to_cpu(entry->e_tag);
		acl->a_entries[i].e_perm = le16_to_cpu(entry->e_perm);

		switch (acl->a_entries[i].e_tag) {
		case ACL_USER_OBJ:
		case ACL_GROUP_OBJ:
		case ACL_MASK:
		case ACL_OTHER:
			entry = (struct f2fs_acl_entry *)((char *)entry +
					sizeof(struct f2fs_acl_entry_short));
			break;

		case ACL_USER:
			acl->a_entries[i].e_uid =
				make_kuid(&init_user_ns,
						le32_to_cpu(entry->e_id));
			entry = (struct f2fs_acl_entry *)((char *)entry +
					sizeof(struct f2fs_acl_entry));
			break;
		case ACL_GROUP:
			acl->a_entries[i].e_gid =
				make_kgid(&init_user_ns,
						le32_to_cpu(entry->e_id));
			entry = (struct f2fs_acl_entry *)((char *)entry +
					sizeof(struct f2fs_acl_entry));
			break;
		default:
			goto fail;
		}
	}
	if ((char *)entry != end)
		goto fail;
	return acl;
fail:
	posix_acl_release(acl);
	return ERR_PTR(-EINVAL);
}

struct posix_acl *nfs3_get_acl(struct inode *inode, int type)
{
	struct nfs_server *server = NFS_SERVER(inode);
	struct page *pages[NFSACL_MAXPAGES] = { };
	struct nfs3_getaclargs args = {
		.fh = NFS_FH(inode),
		/* The xdr layer may allocate pages here. */
		.pages = pages,
	};
	struct nfs3_getaclres res = {
		NULL,
	};
	struct rpc_message msg = {
		.rpc_argp	= &args,
		.rpc_resp	= &res,
	};
	int status, count;

	if (!nfs_server_capable(inode, NFS_CAP_ACLS))
		return ERR_PTR(-EOPNOTSUPP);

	status = nfs_revalidate_inode(server, inode);
	if (status < 0)
		return ERR_PTR(status);

	/*
	 * Only get the access acl when explicitly requested: We don't
	 * need it for access decisions, and only some applications use
	 * it. Applications which request the access acl first are not
	 * penalized from this optimization.
	 */
	if (type == ACL_TYPE_ACCESS)
		args.mask |= NFS_ACLCNT|NFS_ACL;
	if (S_ISDIR(inode->i_mode))
		args.mask |= NFS_DFACLCNT|NFS_DFACL;
	if (args.mask == 0)
		return NULL;

	dprintk("NFS call getacl\n");
	msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL];
	res.fattr = nfs_alloc_fattr();
	if (res.fattr == NULL)
		return ERR_PTR(-ENOMEM);

	if (args.mask & NFS_ACL)
		nfs3_prepare_get_acl(&inode->i_acl);
	if (args.mask & NFS_DFACL)
		nfs3_prepare_get_acl(&inode->i_default_acl);

	status = rpc_call_sync(server->client_acl, &msg, 0);
	dprintk("NFS reply getacl: %d\n", status);

	/* pages may have been allocated at the xdr layer. */
	for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
		__free_page(args.pages[count]);

	switch (status) {
		case 0:
			status = nfs_refresh_inode(inode, res.fattr);
			break;
		case -EPFNOSUPPORT:
		case -EPROTONOSUPPORT:
			dprintk("NFS_V3_ACL extension not supported; disabling\n");
			server->caps &= ~NFS_CAP_ACLS;
		case -ENOTSUPP:
			status = -EOPNOTSUPP;
		default:
			goto getout;
	}
	if ((args.mask & res.mask) != args.mask) {
		status = -EIO;
		goto getout;
	}

	if (res.acl_access != NULL) {
		if ((posix_acl_equiv_mode(res.acl_access, NULL) == 0) ||
		    res.acl_access->a_count == 0) {
			posix_acl_release(res.acl_access);
			res.acl_access = NULL;
		}
	}

	if (res.mask & NFS_ACL)
		nfs3_complete_get_acl(&inode->i_acl, res.acl_access);
	else
		forget_cached_acl(inode, ACL_TYPE_ACCESS);

	if (res.mask & NFS_DFACL)
		nfs3_complete_get_acl(&inode->i_default_acl, res.acl_default);
	else
		forget_cached_acl(inode, ACL_TYPE_DEFAULT);

	nfs_free_fattr(res.fattr);
	if (type == ACL_TYPE_ACCESS) {
		posix_acl_release(res.acl_default);
		return res.acl_access;
	} else {
		posix_acl_release(res.acl_access);
		return res.acl_default;
	}
//.........这里部分代码省略.........