Beispiel #1
0
int fuse_update_attributes(struct inode *inode, struct kstat *stat,
			   struct file *file, bool *refreshed)
{
	struct fuse_inode *fi = get_fuse_inode(inode);
	int err;
	bool r;

	if (time_before64(fi->i_time, get_jiffies_64())) {
		r = true;
		forget_all_cached_acls(inode);
		err = fuse_do_getattr(inode, stat, file);
	} else {
		r = false;
		err = 0;
		if (stat) {
			generic_fillattr(inode, stat);
			stat->mode = fi->orig_i_mode;
			stat->ino = fi->orig_ino;
		}
	}

	if (refreshed != NULL)
		*refreshed = r;

	return err;
}
Beispiel #2
0
static int fuse_update_get_attr(struct inode *inode, struct file *file,
				struct kstat *stat, u32 request_mask,
				unsigned int flags)
{
	struct fuse_inode *fi = get_fuse_inode(inode);
	int err = 0;
	bool sync;

	if (flags & AT_STATX_FORCE_SYNC)
		sync = true;
	else if (flags & AT_STATX_DONT_SYNC)
		sync = false;
	else if (request_mask & READ_ONCE(fi->inval_mask))
		sync = true;
	else
		sync = time_before64(fi->i_time, get_jiffies_64());

	if (sync) {
		forget_all_cached_acls(inode);
		err = fuse_do_getattr(inode, stat, file);
	} else if (stat) {
		generic_fillattr(inode, stat);
		stat->mode = fi->orig_i_mode;
		stat->ino = fi->orig_ino;
	}

	return err;
}
Beispiel #3
0
static void inode_go_inval(struct gfs2_glock *gl, int flags)
{
	struct gfs2_inode *ip = gfs2_glock2inode(gl);

	gfs2_assert_withdraw(gl->gl_name.ln_sbd, !atomic_read(&gl->gl_ail_count));

	if (flags & DIO_METADATA) {
		struct address_space *mapping = gfs2_glock2aspace(gl);
		truncate_inode_pages(mapping, 0);
		if (ip) {
			set_bit(GIF_INVALID, &ip->i_flags);
			forget_all_cached_acls(&ip->i_inode);
			security_inode_invalidate_secctx(&ip->i_inode);
			gfs2_dir_hash_inval(ip);
		}
	}

	if (ip == GFS2_I(gl->gl_name.ln_sbd->sd_rindex)) {
		gfs2_log_flush(gl->gl_name.ln_sbd, NULL,
			       GFS2_LOG_HEAD_FLUSH_NORMAL |
			       GFS2_LFC_INODE_GO_INVAL);
		gl->gl_name.ln_sbd->sd_rindex_uptodate = 0;
	}
	if (ip && S_ISREG(ip->i_inode.i_mode))
		truncate_inode_pages(ip->i_inode.i_mapping, 0);

	gfs2_clear_glop_pending(ip);
}
Beispiel #4
0
static int fuse_perm_getattr(struct inode *inode, int mask)
{
	if (mask & MAY_NOT_BLOCK)
		return -ECHILD;

	forget_all_cached_acls(inode);
	return fuse_do_getattr(inode, NULL, NULL);
}
Beispiel #5
0
static int fuse_setattr(struct dentry *entry, struct iattr *attr)
{
	struct inode *inode = d_inode(entry);
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct file *file = (attr->ia_valid & ATTR_FILE) ? attr->ia_file : NULL;
	int ret;

	if (!fuse_allow_current_process(get_fuse_conn(inode)))
		return -EACCES;

	if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) {
		attr->ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID |
				    ATTR_MODE);

		/*
		 * The only sane way to reliably kill suid/sgid is to do it in
		 * the userspace filesystem
		 *
		 * This should be done on write(), truncate() and chown().
		 */
		if (!fc->handle_killpriv) {
			/*
			 * ia_mode calculation may have used stale i_mode.
			 * Refresh and recalculate.
			 */
			ret = fuse_do_getattr(inode, NULL, file);
			if (ret)
				return ret;

			attr->ia_mode = inode->i_mode;
			if (inode->i_mode & S_ISUID) {
				attr->ia_valid |= ATTR_MODE;
				attr->ia_mode &= ~S_ISUID;
			}
			if ((inode->i_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
				attr->ia_valid |= ATTR_MODE;
				attr->ia_mode &= ~S_ISGID;
			}
		}
	}
	if (!attr->ia_valid)
		return 0;

	ret = fuse_do_setattr(entry, attr, file);
	if (!ret) {
		/*
		 * If filesystem supports acls it may have updated acl xattrs in
		 * the filesystem, so forget cached acls for the inode.
		 */
		if (fc->posix_acl)
			forget_all_cached_acls(inode);

		/* Directory mode changed, may need to revalidate access */
		if (d_is_dir(entry) && (attr->ia_valid & ATTR_MODE))
			fuse_invalidate_entry_cache(entry);
	}
	return ret;
}
Beispiel #6
0
int fuse_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
	struct fuse_conn *fc = get_fuse_conn(inode);
	const char *name;
	int ret;

	if (!fc->posix_acl || fc->no_setxattr)
		return -EOPNOTSUPP;

	if (type == ACL_TYPE_ACCESS)
		name = XATTR_NAME_POSIX_ACL_ACCESS;
	else if (type == ACL_TYPE_DEFAULT)
		name = XATTR_NAME_POSIX_ACL_DEFAULT;
	else
		return -EINVAL;

	if (acl) {
		/*
		 * Fuse userspace is responsible for updating access
		 * permissions in the inode, if needed. fuse_setxattr
		 * invalidates the inode attributes, which will force
		 * them to be refreshed the next time they are used,
		 * and it also updates i_ctime.
		 */
		size_t size = posix_acl_xattr_size(acl->a_count);
		void *value;

		if (size > PAGE_SIZE)
			return -E2BIG;

		value = kmalloc(size, GFP_KERNEL);
		if (!value)
			return -ENOMEM;

		ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
		if (ret < 0) {
			kfree(value);
			return ret;
		}

		ret = fuse_setxattr(inode, name, value, size, 0);
		kfree(value);
	} else {
		ret = fuse_removexattr(inode, name);
	}
	forget_all_cached_acls(inode);
	fuse_invalidate_attr(inode);

	return ret;
}
Beispiel #7
0
static int fuse_update_get_attr(struct inode *inode, struct file *file,
				struct kstat *stat)
{
	struct fuse_inode *fi = get_fuse_inode(inode);
	int err = 0;

	if (time_before64(fi->i_time, get_jiffies_64())) {
		forget_all_cached_acls(inode);
		err = fuse_do_getattr(inode, stat, file);
	} else if (stat) {
		generic_fillattr(inode, stat);
		stat->mode = fi->orig_i_mode;
		stat->ino = fi->orig_ino;
	}

	return err;
}
Beispiel #8
0
static void inode_go_inval(struct gfs2_glock *gl, int flags)
{
	struct gfs2_inode *ip = gl->gl_object;

	gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));

	if (flags & DIO_METADATA) {
		struct address_space *mapping = gfs2_glock2aspace(gl);
		truncate_inode_pages(mapping, 0);
		if (ip) {
			set_bit(GIF_INVALID, &ip->i_flags);
			forget_all_cached_acls(&ip->i_inode);
		}
	}

	if (ip == GFS2_I(gl->gl_sbd->sd_rindex))
		gl->gl_sbd->sd_rindex_uptodate = 0;
	if (ip && S_ISREG(ip->i_inode.i_mode))
		truncate_inode_pages(ip->i_inode.i_mapping, 0);
}
Beispiel #9
0
int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
			     loff_t offset, loff_t len)
{
	struct inode *inode;
	pgoff_t pg_start;
	pgoff_t pg_end;

	inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid);
	if (!inode)
		return -ENOENT;

	fuse_invalidate_attr(inode);
	forget_all_cached_acls(inode);
	if (offset >= 0) {
		pg_start = offset >> PAGE_SHIFT;
		if (len <= 0)
			pg_end = -1;
		else
			pg_end = (offset + len - 1) >> PAGE_SHIFT;
		invalidate_inode_pages2_range(inode->i_mapping,
					      pg_start, pg_end);
	}
Beispiel #10
0
/*
 * Check whether the dentry is still valid
 *
 * If the entry validity timeout has expired and the dentry is
 * positive, try to redo the lookup.  If the lookup results in a
 * different inode, then let the VFS invalidate the dentry and redo
 * the lookup once more.  If the lookup results in the same inode,
 * then refresh the attributes, timeouts and mark the dentry valid.
 */
static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
{
	struct inode *inode;
	struct dentry *parent;
	struct fuse_conn *fc;
	struct fuse_inode *fi;
	int ret;

	inode = d_inode_rcu(entry);
	if (inode && is_bad_inode(inode))
		goto invalid;
	else if (time_before64(fuse_dentry_time(entry), get_jiffies_64()) ||
		 (flags & LOOKUP_REVAL)) {
		struct fuse_entry_out outarg;
		FUSE_ARGS(args);
		struct fuse_forget_link *forget;
		u64 attr_version;

		/* For negative dentries, always do a fresh lookup */
		if (!inode)
			goto invalid;

		ret = -ECHILD;
		if (flags & LOOKUP_RCU)
			goto out;

		fc = get_fuse_conn(inode);

		forget = fuse_alloc_forget();
		ret = -ENOMEM;
		if (!forget)
			goto out;

		attr_version = fuse_get_attr_version(fc);

		parent = dget_parent(entry);
		fuse_lookup_init(fc, &args, get_node_id(d_inode(parent)),
				 &entry->d_name, &outarg);
		ret = fuse_simple_request(fc, &args);
		dput(parent);
		/* Zero nodeid is same as -ENOENT */
		if (!ret && !outarg.nodeid)
			ret = -ENOENT;
		if (!ret) {
			fi = get_fuse_inode(inode);
			if (outarg.nodeid != get_node_id(inode)) {
				fuse_queue_forget(fc, forget, outarg.nodeid, 1);
				goto invalid;
			}
			spin_lock(&fc->lock);
			fi->nlookup++;
			spin_unlock(&fc->lock);
		}
		kfree(forget);
		if (ret == -ENOMEM)
			goto out;
		if (ret || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
			goto invalid;

		forget_all_cached_acls(inode);
		fuse_change_attributes(inode, &outarg.attr,
				       entry_attr_timeout(&outarg),
				       attr_version);
		fuse_change_entry_timeout(entry, &outarg);
	} else if (inode) {
		fi = get_fuse_inode(inode);
		if (flags & LOOKUP_RCU) {
			if (test_bit(FUSE_I_INIT_RDPLUS, &fi->state))
				return -ECHILD;
		} else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS, &fi->state)) {
			parent = dget_parent(entry);
			fuse_advise_use_readdirplus(d_inode(parent));
			dput(parent);
		}
	}
	ret = 1;
out:
	return ret;

invalid:
	ret = 0;
	goto out;
}
Beispiel #11
0
static int fuse_direntplus_link(struct file *file,
				struct fuse_direntplus *direntplus,
				u64 attr_version)
{
	struct fuse_entry_out *o = &direntplus->entry_out;
	struct fuse_dirent *dirent = &direntplus->dirent;
	struct dentry *parent = file->f_path.dentry;
	struct qstr name = QSTR_INIT(dirent->name, dirent->namelen);
	struct dentry *dentry;
	struct dentry *alias;
	struct inode *dir = d_inode(parent);
	struct fuse_conn *fc;
	struct inode *inode;
	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);

	if (!o->nodeid) {
		/*
		 * Unlike in the case of fuse_lookup, zero nodeid does not mean
		 * ENOENT. Instead, it only means the userspace filesystem did
		 * not want to return attributes/handle for this entry.
		 *
		 * So do nothing.
		 */
		return 0;
	}

	if (name.name[0] == '.') {
		/*
		 * We could potentially refresh the attributes of the directory
		 * and its parent?
		 */
		if (name.len == 1)
			return 0;
		if (name.name[1] == '.' && name.len == 2)
			return 0;
	}

	if (invalid_nodeid(o->nodeid))
		return -EIO;
	if (!fuse_valid_type(o->attr.mode))
		return -EIO;

	fc = get_fuse_conn(dir);

	name.hash = full_name_hash(parent, name.name, name.len);
	dentry = d_lookup(parent, &name);
	if (!dentry) {
retry:
		dentry = d_alloc_parallel(parent, &name, &wq);
		if (IS_ERR(dentry))
			return PTR_ERR(dentry);
	}
	if (!d_in_lookup(dentry)) {
		struct fuse_inode *fi;
		inode = d_inode(dentry);
		if (!inode ||
		    get_node_id(inode) != o->nodeid ||
		    ((o->attr.mode ^ inode->i_mode) & S_IFMT)) {
			d_invalidate(dentry);
			dput(dentry);
			goto retry;
		}
		if (is_bad_inode(inode)) {
			dput(dentry);
			return -EIO;
		}

		fi = get_fuse_inode(inode);
		spin_lock(&fc->lock);
		fi->nlookup++;
		spin_unlock(&fc->lock);

		forget_all_cached_acls(inode);
		fuse_change_attributes(inode, &o->attr,
				       entry_attr_timeout(o),
				       attr_version);
		/*
		 * The other branch comes via fuse_iget()
		 * which bumps nlookup inside
		 */
	} else {
		inode = fuse_iget(dir->i_sb, o->nodeid, o->generation,
				  &o->attr, entry_attr_timeout(o),
				  attr_version);
		if (!inode)
			inode = ERR_PTR(-ENOMEM);

		alias = d_splice_alias(inode, dentry);
		d_lookup_done(dentry);
		if (alias) {
			dput(dentry);
			dentry = alias;
		}
		if (IS_ERR(dentry))
			return PTR_ERR(dentry);
	}
	if (fc->readdirplus_auto)
		set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state);
	fuse_change_entry_timeout(dentry, o);

	dput(dentry);
	return 0;
}