예제 #1
0
파일: hooks.c 프로젝트: AlexShiLucky/linux
int __fscrypt_prepare_rename(struct inode *old_dir, struct dentry *old_dentry,
			     struct inode *new_dir, struct dentry *new_dentry,
			     unsigned int flags)
{
	int err;

	err = fscrypt_require_key(old_dir);
	if (err)
		return err;

	err = fscrypt_require_key(new_dir);
	if (err)
		return err;

	if (old_dir != new_dir) {
		if (IS_ENCRYPTED(new_dir) &&
		    !fscrypt_has_permitted_context(new_dir,
						   d_inode(old_dentry)))
			return -EPERM;

		if ((flags & RENAME_EXCHANGE) &&
		    IS_ENCRYPTED(old_dir) &&
		    !fscrypt_has_permitted_context(old_dir,
						   d_inode(new_dentry)))
			return -EPERM;
	}
	return 0;
}
예제 #2
0
static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
		struct dentry *dentry)
{
	struct inode *inode = d_inode(old_dentry);
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	int err;

	if (f2fs_encrypted_inode(dir) &&
			!fscrypt_has_permitted_context(dir, inode))
		return -EPERM;

	f2fs_balance_fs(sbi, true);

	inode->i_ctime = CURRENT_TIME;
	ihold(inode);

	set_inode_flag(inode, FI_INC_LINK);
	f2fs_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	if (err)
		goto out;
	f2fs_unlock_op(sbi);

	d_instantiate(dentry, inode);

	if (IS_DIRSYNC(dir))
		f2fs_sync_fs(sbi->sb, 1);
	return 0;
out:
	clear_inode_flag(inode, FI_INC_LINK);
	iput(inode);
	f2fs_unlock_op(sbi);
	return err;
}
예제 #3
0
파일: hooks.c 프로젝트: AlexShiLucky/linux
int __fscrypt_prepare_link(struct inode *inode, struct inode *dir)
{
	int err;

	err = fscrypt_require_key(dir);
	if (err)
		return err;

	if (!fscrypt_has_permitted_context(dir, inode))
		return -EPERM;

	return 0;
}
예제 #4
0
파일: hooks.c 프로젝트: AlexShiLucky/linux
/**
 * fscrypt_file_open - prepare to open a possibly-encrypted regular file
 * @inode: the inode being opened
 * @filp: the struct file being set up
 *
 * Currently, an encrypted regular file can only be opened if its encryption key
 * is available; access to the raw encrypted contents is not supported.
 * Therefore, we first set up the inode's encryption key (if not already done)
 * and return an error if it's unavailable.
 *
 * We also verify that if the parent directory (from the path via which the file
 * is being opened) is encrypted, then the inode being opened uses the same
 * encryption policy.  This is needed as part of the enforcement that all files
 * in an encrypted directory tree use the same encryption policy, as a
 * protection against certain types of offline attacks.  Note that this check is
 * needed even when opening an *unencrypted* file, since it's forbidden to have
 * an unencrypted file in an encrypted directory.
 *
 * Return: 0 on success, -ENOKEY if the key is missing, or another -errno code
 */
int fscrypt_file_open(struct inode *inode, struct file *filp)
{
	int err;
	struct dentry *dir;

	err = fscrypt_require_key(inode);
	if (err)
		return err;

	dir = dget_parent(file_dentry(filp));
	if (IS_ENCRYPTED(d_inode(dir)) &&
	    !fscrypt_has_permitted_context(d_inode(dir), inode)) {
		fscrypt_warn(inode->i_sb,
			     "inconsistent encryption contexts: %lu/%lu",
			     d_inode(dir)->i_ino, inode->i_ino);
		err = -EPERM;
	}
	dput(dir);
	return err;
}
예제 #5
0
static int ubifs_link(struct dentry *old_dentry, struct inode *dir,
		      struct dentry *dentry)
{
	struct ubifs_info *c = dir->i_sb->s_fs_info;
	struct inode *inode = d_inode(old_dentry);
	struct ubifs_inode *ui = ubifs_inode(inode);
	struct ubifs_inode *dir_ui = ubifs_inode(dir);
	int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len);
	struct ubifs_budget_req req = { .new_dent = 1, .dirtied_ino = 2,
				.dirtied_ino_d = ALIGN(ui->data_len, 8) };
	struct fscrypt_name nm;

	/*
	 * Budget request settings: new direntry, changing the target inode,
	 * changing the parent inode.
	 */

	dbg_gen("dent '%pd' to ino %lu (nlink %d) in dir ino %lu",
		dentry, inode->i_ino,
		inode->i_nlink, dir->i_ino);
	ubifs_assert(inode_is_locked(dir));
	ubifs_assert(inode_is_locked(inode));

	if (ubifs_crypt_is_encrypted(dir) &&
	    !fscrypt_has_permitted_context(dir, inode))
		return -EPERM;

	err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
	if (err)
		return err;

	err = dbg_check_synced_i_size(c, inode);
	if (err)
		goto out_fname;

	err = ubifs_budget_space(c, &req);
	if (err)
		goto out_fname;

	lock_2_inodes(dir, inode);

	/* Handle O_TMPFILE corner case, it is allowed to link a O_TMPFILE. */
	if (inode->i_nlink == 0)
		ubifs_delete_orphan(c, inode->i_ino);

	inc_nlink(inode);
	ihold(inode);
	inode->i_ctime = current_time(inode);
	dir->i_size += sz_change;
	dir_ui->ui_size = dir->i_size;
	dir->i_mtime = dir->i_ctime = inode->i_ctime;
	err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
	if (err)
		goto out_cancel;
	unlock_2_inodes(dir, inode);

	ubifs_release_budget(c, &req);
	d_instantiate(dentry, inode);
	fscrypt_free_filename(&nm);
	return 0;

out_cancel:
	dir->i_size -= sz_change;
	dir_ui->ui_size = dir->i_size;
	drop_nlink(inode);
	if (inode->i_nlink == 0)
		ubifs_add_orphan(c, inode->i_ino);
	unlock_2_inodes(dir, inode);
	ubifs_release_budget(c, &req);
	iput(inode);
out_fname:
	fscrypt_free_filename(&nm);
	return err;
}

static int ubifs_unlink(struct inode *dir, struct dentry *dentry)
{
	struct ubifs_info *c = dir->i_sb->s_fs_info;
	struct inode *inode = d_inode(dentry);
	struct ubifs_inode *dir_ui = ubifs_inode(dir);
	int err, sz_change, budgeted = 1;
	struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
	unsigned int saved_nlink = inode->i_nlink;
	struct fscrypt_name nm;

	/*
	 * Budget request settings: deletion direntry, deletion inode (+1 for
	 * @dirtied_ino), changing the parent directory inode. If budgeting
	 * fails, go ahead anyway because we have extra space reserved for
	 * deletions.
	 */

	dbg_gen("dent '%pd' from ino %lu (nlink %d) in dir ino %lu",
		dentry, inode->i_ino,
		inode->i_nlink, dir->i_ino);

	if (ubifs_crypt_is_encrypted(dir)) {
		err = fscrypt_get_encryption_info(dir);
		if (err && err != -ENOKEY)
			return err;
	}

	err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm);
	if (err)
		return err;

	sz_change = CALC_DENT_SIZE(fname_len(&nm));

	ubifs_assert(inode_is_locked(dir));
	ubifs_assert(inode_is_locked(inode));
	err = dbg_check_synced_i_size(c, inode);
	if (err)
		goto out_fname;

	err = ubifs_budget_space(c, &req);
	if (err) {
		if (err != -ENOSPC)
			goto out_fname;
		budgeted = 0;
	}

	lock_2_inodes(dir, inode);
	inode->i_ctime = current_time(dir);
	drop_nlink(inode);
	dir->i_size -= sz_change;
	dir_ui->ui_size = dir->i_size;
	dir->i_mtime = dir->i_ctime = inode->i_ctime;
	err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0);
	if (err)
		goto out_cancel;
	unlock_2_inodes(dir, inode);

	if (budgeted)
		ubifs_release_budget(c, &req);
	else {
		/* We've deleted something - clean the "no space" flags */
		c->bi.nospace = c->bi.nospace_rp = 0;
		smp_wmb();
	}
	fscrypt_free_filename(&nm);
	return 0;

out_cancel:
	dir->i_size += sz_change;
	dir_ui->ui_size = dir->i_size;
	set_nlink(inode, saved_nlink);
	unlock_2_inodes(dir, inode);
	if (budgeted)
		ubifs_release_budget(c, &req);
out_fname:
	fscrypt_free_filename(&nm);
	return err;
}

/**
 * check_dir_empty - check if a directory is empty or not.
 * @dir: VFS inode object of the directory to check
 *
 * This function checks if directory @dir is empty. Returns zero if the
 * directory is empty, %-ENOTEMPTY if it is not, and other negative error codes
 * in case of of errors.
 */
int ubifs_check_dir_empty(struct inode *dir)
{
	struct ubifs_info *c = dir->i_sb->s_fs_info;
	struct fscrypt_name nm = { 0 };
	struct ubifs_dent_node *dent;
	union ubifs_key key;
	int err;

	lowest_dent_key(c, &key, dir->i_ino);
	dent = ubifs_tnc_next_ent(c, &key, &nm);
	if (IS_ERR(dent)) {
		err = PTR_ERR(dent);
		if (err == -ENOENT)
			err = 0;
	} else {
		kfree(dent);
		err = -ENOTEMPTY;
	}
	return err;
}

static int ubifs_rmdir(struct inode *dir, struct dentry *dentry)
{
	struct ubifs_info *c = dir->i_sb->s_fs_info;
	struct inode *inode = d_inode(dentry);
	int err, sz_change, budgeted = 1;
	struct ubifs_inode *dir_ui = ubifs_inode(dir);
	struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
	struct fscrypt_name nm;

	/*
	 * Budget request settings: deletion direntry, deletion inode and
	 * changing the parent inode. If budgeting fails, go ahead anyway
	 * because we have extra space reserved for deletions.
	 */

	dbg_gen("directory '%pd', ino %lu in dir ino %lu", dentry,
		inode->i_ino, dir->i_ino);
	ubifs_assert(inode_is_locked(dir));
	ubifs_assert(inode_is_locked(inode));
	err = ubifs_check_dir_empty(d_inode(dentry));
	if (err)
		return err;

	if (ubifs_crypt_is_encrypted(dir)) {
		err = fscrypt_get_encryption_info(dir);
		if (err && err != -ENOKEY)
			return err;
	}

	err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm);
	if (err)
		return err;

	sz_change = CALC_DENT_SIZE(fname_len(&nm));

	err = ubifs_budget_space(c, &req);
	if (err) {
		if (err != -ENOSPC)
			goto out_fname;
		budgeted = 0;
	}

	lock_2_inodes(dir, inode);
	inode->i_ctime = current_time(dir);
	clear_nlink(inode);
	drop_nlink(dir);
	dir->i_size -= sz_change;
	dir_ui->ui_size = dir->i_size;
	dir->i_mtime = dir->i_ctime = inode->i_ctime;
	err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0);
	if (err)
		goto out_cancel;
	unlock_2_inodes(dir, inode);

	if (budgeted)
		ubifs_release_budget(c, &req);
	else {
		/* We've deleted something - clean the "no space" flags */
		c->bi.nospace = c->bi.nospace_rp = 0;
		smp_wmb();
	}
	fscrypt_free_filename(&nm);
	return 0;

out_cancel:
	dir->i_size += sz_change;
	dir_ui->ui_size = dir->i_size;
	inc_nlink(dir);
	set_nlink(inode, 2);
	unlock_2_inodes(dir, inode);
	if (budgeted)
		ubifs_release_budget(c, &req);
out_fname:
	fscrypt_free_filename(&nm);
	return err;
}

static int ubifs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
	struct inode *inode;
	struct ubifs_inode *dir_ui = ubifs_inode(dir);
	struct ubifs_info *c = dir->i_sb->s_fs_info;
	int err, sz_change;
	struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1 };
	struct fscrypt_name nm;

	/*
	 * Budget request settings: new inode, new direntry and changing parent
	 * directory inode.
	 */

	dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
		dentry, mode, dir->i_ino);

	err = ubifs_budget_space(c, &req);
	if (err)
		return err;

	err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
	if (err)
		goto out_budg;

	sz_change = CALC_DENT_SIZE(fname_len(&nm));

	inode = ubifs_new_inode(c, dir, S_IFDIR | mode);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		goto out_fname;
	}

	err = ubifs_init_security(dir, inode, &dentry->d_name);
	if (err)
		goto out_inode;

	mutex_lock(&dir_ui->ui_mutex);
	insert_inode_hash(inode);
	inc_nlink(inode);
	inc_nlink(dir);
	dir->i_size += sz_change;
	dir_ui->ui_size = dir->i_size;
	dir->i_mtime = dir->i_ctime = inode->i_ctime;
	err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
	if (err) {
		ubifs_err(c, "cannot create directory, error %d", err);
		goto out_cancel;
	}
	mutex_unlock(&dir_ui->ui_mutex);

	ubifs_release_budget(c, &req);
	d_instantiate(dentry, inode);
	fscrypt_free_filename(&nm);
	return 0;

out_cancel:
	dir->i_size -= sz_change;
	dir_ui->ui_size = dir->i_size;
	drop_nlink(dir);
	mutex_unlock(&dir_ui->ui_mutex);
out_inode:
	make_bad_inode(inode);
	iput(inode);
out_fname:
	fscrypt_free_filename(&nm);
out_budg:
	ubifs_release_budget(c, &req);
	return err;
}

static int ubifs_mknod(struct inode *dir, struct dentry *dentry,
		       umode_t mode, dev_t rdev)
{
	struct inode *inode;
	struct ubifs_inode *ui;
	struct ubifs_inode *dir_ui = ubifs_inode(dir);
	struct ubifs_info *c = dir->i_sb->s_fs_info;
	union ubifs_dev_desc *dev = NULL;
	int sz_change;
	int err, devlen = 0;
	struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
					.dirtied_ino = 1 };
	struct fscrypt_name nm;

	/*
	 * Budget request settings: new inode, new direntry and changing parent
	 * directory inode.
	 */

	dbg_gen("dent '%pd' in dir ino %lu", dentry, dir->i_ino);

	if (S_ISBLK(mode) || S_ISCHR(mode)) {
		dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
		if (!dev)
			return -ENOMEM;
		devlen = ubifs_encode_dev(dev, rdev);
	}

	req.new_ino_d = ALIGN(devlen, 8);
	err = ubifs_budget_space(c, &req);
	if (err) {
		kfree(dev);
		return err;
	}

	err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
	if (err) {
		kfree(dev);
		goto out_budg;
	}

	sz_change = CALC_DENT_SIZE(fname_len(&nm));

	inode = ubifs_new_inode(c, dir, mode);
	if (IS_ERR(inode)) {
		kfree(dev);
		err = PTR_ERR(inode);
		goto out_fname;
	}

	init_special_inode(inode, inode->i_mode, rdev);
	inode->i_size = ubifs_inode(inode)->ui_size = devlen;
	ui = ubifs_inode(inode);
	ui->data = dev;
	ui->data_len = devlen;

	err = ubifs_init_security(dir, inode, &dentry->d_name);
	if (err)
		goto out_inode;

	mutex_lock(&dir_ui->ui_mutex);
	dir->i_size += sz_change;
	dir_ui->ui_size = dir->i_size;
	dir->i_mtime = dir->i_ctime = inode->i_ctime;
	err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
	if (err)
		goto out_cancel;
	mutex_unlock(&dir_ui->ui_mutex);

	ubifs_release_budget(c, &req);
	insert_inode_hash(inode);
	d_instantiate(dentry, inode);
	fscrypt_free_filename(&nm);
	return 0;

out_cancel:
	dir->i_size -= sz_change;
	dir_ui->ui_size = dir->i_size;
	mutex_unlock(&dir_ui->ui_mutex);
out_inode:
	make_bad_inode(inode);
	iput(inode);
out_fname:
	fscrypt_free_filename(&nm);
out_budg:
	ubifs_release_budget(c, &req);
	return err;
}

static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
			 const char *symname)
{
	struct inode *inode;
	struct ubifs_inode *ui;
	struct ubifs_inode *dir_ui = ubifs_inode(dir);
	struct ubifs_info *c = dir->i_sb->s_fs_info;
	int err, len = strlen(symname);
	int sz_change = CALC_DENT_SIZE(len);
	struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
	struct fscrypt_symlink_data *sd = NULL;
	struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
					.new_ino_d = ALIGN(len, 8),
					.dirtied_ino = 1 };
	struct fscrypt_name nm;

	if (ubifs_crypt_is_encrypted(dir)) {
		err = fscrypt_get_encryption_info(dir);
		if (err)
			goto out_budg;

		if (!fscrypt_has_encryption_key(dir)) {
			err = -EPERM;
			goto out_budg;
		}

		disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
				sizeof(struct fscrypt_symlink_data));
	}

	/*
	 * Budget request settings: new inode, new direntry and changing parent
	 * directory inode.
	 */

	dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry,
		symname, dir->i_ino);

	if (disk_link.len > UBIFS_MAX_INO_DATA)
		return -ENAMETOOLONG;

	err = ubifs_budget_space(c, &req);
	if (err)
		return err;

	err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
	if (err)
		goto out_budg;

	inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		goto out_fname;
	}

	ui = ubifs_inode(inode);
	ui->data = kmalloc(disk_link.len, GFP_NOFS);
	if (!ui->data) {
		err = -ENOMEM;
		goto out_inode;
	}

	if (ubifs_crypt_is_encrypted(dir)) {
		struct qstr istr = QSTR_INIT(symname, len);
		struct fscrypt_str ostr;

		sd = kzalloc(disk_link.len, GFP_NOFS);
		if (!sd) {
			err = -ENOMEM;
			goto out_inode;
		}

		ostr.name = sd->encrypted_path;
		ostr.len = disk_link.len;

		err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
		if (err) {
			kfree(sd);
			goto out_inode;
		}

		sd->len = cpu_to_le16(ostr.len);
		disk_link.name = (char *)sd;
	} else {
		inode->i_link = ui->data;
	}

	memcpy(ui->data, disk_link.name, disk_link.len);
	((char *)ui->data)[disk_link.len - 1] = '\0';

	/*
	 * The terminating zero byte is not written to the flash media and it
	 * is put just to make later in-memory string processing simpler. Thus,
	 * data length is @len, not @len + %1.
	 */
	ui->data_len = disk_link.len - 1;
	inode->i_size = ubifs_inode(inode)->ui_size = disk_link.len - 1;

	err = ubifs_init_security(dir, inode, &dentry->d_name);
	if (err)
		goto out_inode;

	mutex_lock(&dir_ui->ui_mutex);
	dir->i_size += sz_change;
	dir_ui->ui_size = dir->i_size;
	dir->i_mtime = dir->i_ctime = inode->i_ctime;
	err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
	if (err)
		goto out_cancel;
	mutex_unlock(&dir_ui->ui_mutex);

	ubifs_release_budget(c, &req);
	insert_inode_hash(inode);
	d_instantiate(dentry, inode);
	fscrypt_free_filename(&nm);
	return 0;

out_cancel:
	dir->i_size -= sz_change;
	dir_ui->ui_size = dir->i_size;
	mutex_unlock(&dir_ui->ui_mutex);
out_inode:
	make_bad_inode(inode);
	iput(inode);
out_fname:
	fscrypt_free_filename(&nm);
out_budg:
	ubifs_release_budget(c, &req);
	return err;
}

/**
 * lock_4_inodes - a wrapper for locking three UBIFS inodes.
 * @inode1: first inode
 * @inode2: second inode
 * @inode3: third inode
 * @inode4: fouth inode
 *
 * This function is used for 'ubifs_rename()' and @inode1 may be the same as
 * @inode2 whereas @inode3 and @inode4 may be %NULL.
 *
 * We do not implement any tricks to guarantee strict lock ordering, because
 * VFS has already done it for us on the @i_mutex. So this is just a simple
 * wrapper function.
 */
static void lock_4_inodes(struct inode *inode1, struct inode *inode2,
			  struct inode *inode3, struct inode *inode4)
{
	mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
	if (inode2 != inode1)
		mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
	if (inode3)
		mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3);
	if (inode4)
		mutex_lock_nested(&ubifs_inode(inode4)->ui_mutex, WB_MUTEX_4);
}

/**
 * unlock_4_inodes - a wrapper for unlocking three UBIFS inodes for rename.
 * @inode1: first inode
 * @inode2: second inode
 * @inode3: third inode
 * @inode4: fouth inode
 */
static void unlock_4_inodes(struct inode *inode1, struct inode *inode2,
			    struct inode *inode3, struct inode *inode4)
{
	if (inode4)
		mutex_unlock(&ubifs_inode(inode4)->ui_mutex);
	if (inode3)
		mutex_unlock(&ubifs_inode(inode3)->ui_mutex);
	if (inode1 != inode2)
		mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
	mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
}

static int do_rename(struct inode *old_dir, struct dentry *old_dentry,
		     struct inode *new_dir, struct dentry *new_dentry,
		     unsigned int flags)
{
	struct ubifs_info *c = old_dir->i_sb->s_fs_info;
	struct inode *old_inode = d_inode(old_dentry);
	struct inode *new_inode = d_inode(new_dentry);
	struct inode *whiteout = NULL;
	struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode);
	struct ubifs_inode *whiteout_ui = NULL;
	int err, release, sync = 0, move = (new_dir != old_dir);
	int is_dir = S_ISDIR(old_inode->i_mode);
	int unlink = !!new_inode, new_sz, old_sz;
	struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1,
					.dirtied_ino = 3 };
	struct ubifs_budget_req ino_req = { .dirtied_ino = 1,
			.dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) };
	struct timespec time;
	unsigned int uninitialized_var(saved_nlink);
	struct fscrypt_name old_nm, new_nm;

	/*
	 * Budget request settings: deletion direntry, new direntry, removing
	 * the old inode, and changing old and new parent directory inodes.
	 *
	 * However, this operation also marks the target inode as dirty and
	 * does not write it, so we allocate budget for the target inode
	 * separately.
	 */

	dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu flags 0x%x",
		old_dentry, old_inode->i_ino, old_dir->i_ino,
		new_dentry, new_dir->i_ino, flags);

	if (unlink)
		ubifs_assert(inode_is_locked(new_inode));

	if (old_dir != new_dir) {
		if (ubifs_crypt_is_encrypted(new_dir) &&
		    !fscrypt_has_permitted_context(new_dir, old_inode))
			return -EPERM;
	}

	if (unlink && is_dir) {
		err = ubifs_check_dir_empty(new_inode);
		if (err)
			return err;
	}

	err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &old_nm);
	if (err)
		return err;

	err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &new_nm);
	if (err) {
		fscrypt_free_filename(&old_nm);
		return err;
	}

	new_sz = CALC_DENT_SIZE(fname_len(&new_nm));
	old_sz = CALC_DENT_SIZE(fname_len(&old_nm));

	err = ubifs_budget_space(c, &req);
	if (err) {
		fscrypt_free_filename(&old_nm);
		fscrypt_free_filename(&new_nm);
		return err;
	}
	err = ubifs_budget_space(c, &ino_req);
	if (err) {
		fscrypt_free_filename(&old_nm);
		fscrypt_free_filename(&new_nm);
		ubifs_release_budget(c, &req);
		return err;
	}

	if (flags & RENAME_WHITEOUT) {
		union ubifs_dev_desc *dev = NULL;

		dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
		if (!dev) {
			err = -ENOMEM;
			goto out_release;
		}

		err = do_tmpfile(old_dir, old_dentry, S_IFCHR | WHITEOUT_MODE, &whiteout);
		if (err) {
			kfree(dev);
			goto out_release;
		}

		whiteout->i_state |= I_LINKABLE;
		whiteout_ui = ubifs_inode(whiteout);
		whiteout_ui->data = dev;
		whiteout_ui->data_len = ubifs_encode_dev(dev, MKDEV(0, 0));
		ubifs_assert(!whiteout_ui->dirty);
	}

	lock_4_inodes(old_dir, new_dir, new_inode, whiteout);

	/*
	 * Like most other Unix systems, set the @i_ctime for inodes on a
	 * rename.
	 */
	time = current_time(old_dir);
	old_inode->i_ctime = time;

	/* We must adjust parent link count when renaming directories */
	if (is_dir) {
		if (move) {
			/*
			 * @old_dir loses a link because we are moving
			 * @old_inode to a different directory.
			 */
			drop_nlink(old_dir);
			/*
			 * @new_dir only gains a link if we are not also
			 * overwriting an existing directory.
			 */
			if (!unlink)
				inc_nlink(new_dir);
		} else {
			/*
			 * @old_inode is not moving to a different directory,
			 * but @old_dir still loses a link if we are
			 * overwriting an existing directory.
			 */
			if (unlink)
				drop_nlink(old_dir);
		}
	}

	old_dir->i_size -= old_sz;
	ubifs_inode(old_dir)->ui_size = old_dir->i_size;
	old_dir->i_mtime = old_dir->i_ctime = time;
	new_dir->i_mtime = new_dir->i_ctime = time;

	/*
	 * And finally, if we unlinked a direntry which happened to have the
	 * same name as the moved direntry, we have to decrement @i_nlink of
	 * the unlinked inode and change its ctime.
	 */
	if (unlink) {
		/*
		 * Directories cannot have hard-links, so if this is a
		 * directory, just clear @i_nlink.
		 */
		saved_nlink = new_inode->i_nlink;
		if (is_dir)
			clear_nlink(new_inode);
		else
			drop_nlink(new_inode);
		new_inode->i_ctime = time;
	} else {
		new_dir->i_size += new_sz;
		ubifs_inode(new_dir)->ui_size = new_dir->i_size;
	}

	/*
	 * Do not ask 'ubifs_jnl_rename()' to flush write-buffer if @old_inode
	 * is dirty, because this will be done later on at the end of
	 * 'ubifs_rename()'.
	 */
	if (IS_SYNC(old_inode)) {
		sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir);
		if (unlink && IS_SYNC(new_inode))
			sync = 1;
	}

	if (whiteout) {
		struct ubifs_budget_req wht_req = { .dirtied_ino = 1,
				.dirtied_ino_d = \
				ALIGN(ubifs_inode(whiteout)->data_len, 8) };

		err = ubifs_budget_space(c, &wht_req);
		if (err) {
			kfree(whiteout_ui->data);
			whiteout_ui->data_len = 0;
			iput(whiteout);
			goto out_release;
		}

		inc_nlink(whiteout);
		mark_inode_dirty(whiteout);
		whiteout->i_state &= ~I_LINKABLE;
		iput(whiteout);
	}

	err = ubifs_jnl_rename(c, old_dir, old_inode, &old_nm, new_dir,
			       new_inode, &new_nm, whiteout, sync);
	if (err)
		goto out_cancel;

	unlock_4_inodes(old_dir, new_dir, new_inode, whiteout);
	ubifs_release_budget(c, &req);

	mutex_lock(&old_inode_ui->ui_mutex);
	release = old_inode_ui->dirty;
	mark_inode_dirty_sync(old_inode);
	mutex_unlock(&old_inode_ui->ui_mutex);

	if (release)
		ubifs_release_budget(c, &ino_req);
	if (IS_SYNC(old_inode))
		err = old_inode->i_sb->s_op->write_inode(old_inode, NULL);

	fscrypt_free_filename(&old_nm);
	fscrypt_free_filename(&new_nm);
	return err;

out_cancel:
	if (unlink) {
		set_nlink(new_inode, saved_nlink);
	} else {
		new_dir->i_size -= new_sz;
		ubifs_inode(new_dir)->ui_size = new_dir->i_size;
	}
	old_dir->i_size += old_sz;
	ubifs_inode(old_dir)->ui_size = old_dir->i_size;
	if (is_dir) {
		if (move) {
			inc_nlink(old_dir);
			if (!unlink)
				drop_nlink(new_dir);
		} else {
			if (unlink)
				inc_nlink(old_dir);
		}
	}
	if (whiteout) {
		drop_nlink(whiteout);
		iput(whiteout);
	}
	unlock_4_inodes(old_dir, new_dir, new_inode, whiteout);
out_release:
	ubifs_release_budget(c, &ino_req);
	ubifs_release_budget(c, &req);
	fscrypt_free_filename(&old_nm);
	fscrypt_free_filename(&new_nm);
	return err;
}

static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry,
			struct inode *new_dir, struct dentry *new_dentry)
{
	struct ubifs_info *c = old_dir->i_sb->s_fs_info;
	struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1,
				.dirtied_ino = 2 };
	int sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir);
	struct inode *fst_inode = d_inode(old_dentry);
	struct inode *snd_inode = d_inode(new_dentry);
	struct timespec time;
	int err;
	struct fscrypt_name fst_nm, snd_nm;

	ubifs_assert(fst_inode && snd_inode);

	if ((ubifs_crypt_is_encrypted(old_dir) ||
	    ubifs_crypt_is_encrypted(new_dir)) &&
	    (old_dir != new_dir) &&
	    (!fscrypt_has_permitted_context(new_dir, fst_inode) ||
	     !fscrypt_has_permitted_context(old_dir, snd_inode)))
		return -EPERM;

	err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &fst_nm);
	if (err)
		return err;

	err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &snd_nm);
	if (err) {
		fscrypt_free_filename(&fst_nm);
		return err;
	}

	lock_4_inodes(old_dir, new_dir, NULL, NULL);

	time = current_time(old_dir);
	fst_inode->i_ctime = time;
	snd_inode->i_ctime = time;
	old_dir->i_mtime = old_dir->i_ctime = time;
	new_dir->i_mtime = new_dir->i_ctime = time;

	if (old_dir != new_dir) {
		if (S_ISDIR(fst_inode->i_mode) && !S_ISDIR(snd_inode->i_mode)) {
			inc_nlink(new_dir);
			drop_nlink(old_dir);
		}
		else if (!S_ISDIR(fst_inode->i_mode) && S_ISDIR(snd_inode->i_mode)) {
			drop_nlink(new_dir);
			inc_nlink(old_dir);
		}
	}

	err = ubifs_jnl_xrename(c, old_dir, fst_inode, &fst_nm, new_dir,
				snd_inode, &snd_nm, sync);

	unlock_4_inodes(old_dir, new_dir, NULL, NULL);
	ubifs_release_budget(c, &req);

	fscrypt_free_filename(&fst_nm);
	fscrypt_free_filename(&snd_nm);
	return err;
}

static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry,
			struct inode *new_dir, struct dentry *new_dentry,
			unsigned int flags)
{
	if (flags & ~(RENAME_NOREPLACE | RENAME_WHITEOUT | RENAME_EXCHANGE))
		return -EINVAL;

	ubifs_assert(inode_is_locked(old_dir));
	ubifs_assert(inode_is_locked(new_dir));

	if (flags & RENAME_EXCHANGE)
		return ubifs_xrename(old_dir, old_dentry, new_dir, new_dentry);

	return do_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
}

int ubifs_getattr(const struct path *path, struct kstat *stat,
		  u32 request_mask, unsigned int flags)
{
	loff_t size;
	struct inode *inode = d_inode(path->dentry);
	struct ubifs_inode *ui = ubifs_inode(inode);

	mutex_lock(&ui->ui_mutex);

	if (ui->flags & UBIFS_APPEND_FL)
		stat->attributes |= STATX_ATTR_APPEND;
	if (ui->flags & UBIFS_COMPR_FL)
		stat->attributes |= STATX_ATTR_COMPRESSED;
	if (ui->flags & UBIFS_CRYPT_FL)
		stat->attributes |= STATX_ATTR_ENCRYPTED;
	if (ui->flags & UBIFS_IMMUTABLE_FL)
		stat->attributes |= STATX_ATTR_IMMUTABLE;

	stat->attributes_mask |= (STATX_ATTR_APPEND |
				STATX_ATTR_COMPRESSED |
				STATX_ATTR_ENCRYPTED |
				STATX_ATTR_IMMUTABLE);

	generic_fillattr(inode, stat);
	stat->blksize = UBIFS_BLOCK_SIZE;
	stat->size = ui->ui_size;

	/*
	 * Unfortunately, the 'stat()' system call was designed for block
	 * device based file systems, and it is not appropriate for UBIFS,
	 * because UBIFS does not have notion of "block". For example, it is
	 * difficult to tell how many block a directory takes - it actually
	 * takes less than 300 bytes, but we have to round it to block size,
	 * which introduces large mistake. This makes utilities like 'du' to
	 * report completely senseless numbers. This is the reason why UBIFS
	 * goes the same way as JFFS2 - it reports zero blocks for everything
	 * but regular files, which makes more sense than reporting completely
	 * wrong sizes.
	 */
	if (S_ISREG(inode->i_mode)) {
		size = ui->xattr_size;
		size += stat->size;
		size = ALIGN(size, UBIFS_BLOCK_SIZE);
		/*
		 * Note, user-space expects 512-byte blocks count irrespectively
		 * of what was reported in @stat->size.
		 */
		stat->blocks = size >> 9;
	} else
		stat->blocks = 0;
	mutex_unlock(&ui->ui_mutex);
	return 0;
}

static int ubifs_dir_open(struct inode *dir, struct file *file)
{
	if (ubifs_crypt_is_encrypted(dir))
		return fscrypt_get_encryption_info(dir) ? -EACCES : 0;

	return 0;
}

const struct inode_operations ubifs_dir_inode_operations = {
	.lookup      = ubifs_lookup,
	.create      = ubifs_create,
	.link        = ubifs_link,
	.symlink     = ubifs_symlink,
	.unlink      = ubifs_unlink,
	.mkdir       = ubifs_mkdir,
	.rmdir       = ubifs_rmdir,
	.mknod       = ubifs_mknod,
	.rename      = ubifs_rename,
	.setattr     = ubifs_setattr,
	.getattr     = ubifs_getattr,
	.listxattr   = ubifs_listxattr,
#ifdef CONFIG_UBIFS_ATIME_SUPPORT
	.update_time = ubifs_update_time,
#endif
	.tmpfile     = ubifs_tmpfile,
};

const struct file_operations ubifs_dir_operations = {
	.llseek         = generic_file_llseek,
	.release        = ubifs_dir_release,
	.read           = generic_read_dir,
	.iterate_shared = ubifs_readdir,
	.fsync          = ubifs_fsync,
	.unlocked_ioctl = ubifs_ioctl,
	.open		= ubifs_dir_open,
#ifdef CONFIG_COMPAT
	.compat_ioctl   = ubifs_compat_ioctl,
#endif
};
예제 #6
0
static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry,
				   unsigned int flags)
{
	int err;
	union ubifs_key key;
	struct inode *inode = NULL;
	struct ubifs_dent_node *dent;
	struct ubifs_info *c = dir->i_sb->s_fs_info;
	struct fscrypt_name nm;

	dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino);

	if (ubifs_crypt_is_encrypted(dir)) {
		err = fscrypt_get_encryption_info(dir);

		/*
		 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
		 * created while the directory was encrypted and we
		 * have access to the key.
		 */
		if (fscrypt_has_encryption_key(dir))
			fscrypt_set_encrypted_dentry(dentry);
		fscrypt_set_d_op(dentry);
		if (err && err != -ENOKEY)
			return ERR_PTR(err);
	}

	err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm);
	if (err)
		return ERR_PTR(err);

	if (fname_len(&nm) > UBIFS_MAX_NLEN) {
		err = -ENAMETOOLONG;
		goto out_fname;
	}

	dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
	if (!dent) {
		err = -ENOMEM;
		goto out_fname;
	}

	if (nm.hash) {
		ubifs_assert(fname_len(&nm) == 0);
		ubifs_assert(fname_name(&nm) == NULL);
		dent_key_init_hash(c, &key, dir->i_ino, nm.hash);
		err = ubifs_tnc_lookup_dh(c, &key, dent, nm.minor_hash);
	} else {
		dent_key_init(c, &key, dir->i_ino, &nm);
		err = ubifs_tnc_lookup_nm(c, &key, dent, &nm);
	}

	if (err) {
		if (err == -ENOENT) {
			dbg_gen("not found");
			goto done;
		}
		goto out_dent;
	}

	if (dbg_check_name(c, dent, &nm)) {
		err = -EINVAL;
		goto out_dent;
	}

	inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum));
	if (IS_ERR(inode)) {
		/*
		 * This should not happen. Probably the file-system needs
		 * checking.
		 */
		err = PTR_ERR(inode);
		ubifs_err(c, "dead directory entry '%pd', error %d",
			  dentry, err);
		ubifs_ro_mode(c, err);
		goto out_dent;
	}

	if (ubifs_crypt_is_encrypted(dir) &&
	    (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
	    !fscrypt_has_permitted_context(dir, inode)) {
		ubifs_warn(c, "Inconsistent encryption contexts: %lu/%lu",
			   dir->i_ino, inode->i_ino);
		err = -EPERM;
		goto out_inode;
	}

done:
	kfree(dent);
	fscrypt_free_filename(&nm);
	/*
	 * Note, d_splice_alias() would be required instead if we supported
	 * NFS.
	 */
	d_add(dentry, inode);
	return NULL;

out_inode:
	iput(inode);
out_dent:
	kfree(dent);
out_fname:
	fscrypt_free_filename(&nm);
	return ERR_PTR(err);
}
예제 #7
0
struct dentry *f2fs_get_parent(struct dentry *child)
{
	struct qstr dotdot = {.len = 2, .name = ".."};
	struct page *page;
	unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
	if (!ino) {
		if (IS_ERR(page))
			return ERR_CAST(page);
		return ERR_PTR(-ENOENT);
	}
	return d_obtain_alias(f2fs_iget(child->d_sb, ino));
}

static int __recover_dot_dentries(struct inode *dir, nid_t pino)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct qstr dot = QSTR_INIT(".", 1);
	struct qstr dotdot = QSTR_INIT("..", 2);
	struct f2fs_dir_entry *de;
	struct page *page;
	int err = 0;

	if (f2fs_readonly(sbi->sb)) {
		f2fs_msg(sbi->sb, KERN_INFO,
			"skip recovering inline_dots inode (ino:%lu, pino:%u) "
			"in readonly mountpoint", dir->i_ino, pino);
		return 0;
	}

	f2fs_balance_fs(sbi, true);

	f2fs_lock_op(sbi);

	de = f2fs_find_entry(dir, &dot, &page);
	if (de) {
		f2fs_dentry_kunmap(dir, page);
		f2fs_put_page(page, 0);
	} else if (IS_ERR(page)) {
		err = PTR_ERR(page);
		goto out;
	} else {
		err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
		if (err)
			goto out;
	}

	de = f2fs_find_entry(dir, &dotdot, &page);
	if (de) {
		f2fs_dentry_kunmap(dir, page);
		f2fs_put_page(page, 0);
	} else if (IS_ERR(page)) {
		err = PTR_ERR(page);
	} else {
		err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
	}
out:
	if (!err)
		clear_inode_flag(dir, FI_INLINE_DOTS);

	f2fs_unlock_op(sbi);
	return err;
}

static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
					struct nameidata *nd)
{
	struct inode *inode = NULL;
	struct f2fs_dir_entry *de;
	struct page *page;
	nid_t ino;
	int err = 0;
	unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));

	if (f2fs_encrypted_inode(dir)) {
		int res = fscrypt_get_encryption_info(dir);

		/*
		 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
		 * created while the directory was encrypted and we
		 * don't have access to the key.
		 */
		if (fscrypt_has_encryption_key(dir))
			fscrypt_set_encrypted_dentry(dentry);
		fscrypt_set_d_op(dentry);
		if (res && res != -ENOKEY)
			return ERR_PTR(res);
	}

	if (dentry->d_name.len > F2FS_NAME_LEN)
		return ERR_PTR(-ENAMETOOLONG);

	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	if (!de) {
		if (IS_ERR(page))
			return (struct dentry *)page;
		return d_splice_alias(inode, dentry);
	}

	ino = le32_to_cpu(de->ino);
	f2fs_dentry_kunmap(dir, page);
	f2fs_put_page(page, 0);

	inode = f2fs_iget(dir->i_sb, ino);
	if (IS_ERR(inode))
		return ERR_CAST(inode);

	if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
		err = __recover_dot_dentries(dir, root_ino);
		if (err)
			goto err_out;
	}

	if (f2fs_has_inline_dots(inode)) {
		err = __recover_dot_dentries(inode, dir->i_ino);
		if (err)
			goto err_out;
	}
	if (!IS_ERR(inode) && f2fs_encrypted_inode(dir) &&
			(S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
			!fscrypt_has_permitted_context(dir, inode)) {
		bool nokey = f2fs_encrypted_inode(inode) &&
			!fscrypt_has_encryption_key(inode);
		err = nokey ? -ENOKEY : -EPERM;
		goto err_out;
	}
	return d_splice_alias(inode, dentry);

err_out:
	iput(inode);
	return ERR_PTR(err);
}

static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct inode *inode = d_inode(dentry);
	struct f2fs_dir_entry *de;
	struct page *page;
	int err = -ENOENT;

	trace_f2fs_unlink_enter(dir, dentry);

	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	if (!de) {
		if (IS_ERR(page))
			err = PTR_ERR(page);
		goto fail;
	}

	f2fs_balance_fs(sbi, true);

	f2fs_lock_op(sbi);
	err = acquire_orphan_inode(sbi);
	if (err) {
		f2fs_unlock_op(sbi);
		f2fs_dentry_kunmap(dir, page);
		f2fs_put_page(page, 0);
		goto fail;
	}
	f2fs_delete_entry(de, page, dir, inode);
	f2fs_unlock_op(sbi);

	if (IS_DIRSYNC(dir))
		f2fs_sync_fs(sbi->sb, 1);
fail:
	trace_f2fs_unlink_exit(inode, err);
	return err;
}

static void *f2fs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
	struct page *page;
	char *link;

	page = page_follow_link_light(dentry, nd);
	if (IS_ERR(page))
		return page;

	link = nd_get_link(nd);
	if (IS_ERR(link))
		return link;

	/* this is broken symlink case */
	if (*link == 0) {
		kunmap(page);
		page_cache_release(page);
		return ERR_PTR(-ENOENT);
	}
	return page;
}

static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
					const char *symname)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct inode *inode;
	size_t len = strlen(symname);
	struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
	struct fscrypt_symlink_data *sd = NULL;
	int err;

	if (f2fs_encrypted_inode(dir)) {
		err = fscrypt_get_encryption_info(dir);
		if (err)
			return err;

		if (!fscrypt_has_encryption_key(dir))
			return -EPERM;

		disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
				sizeof(struct fscrypt_symlink_data));
	}

	if (disk_link.len > dir->i_sb->s_blocksize)
		return -ENAMETOOLONG;

	inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	if (f2fs_encrypted_inode(inode))
		inode->i_op = &f2fs_encrypted_symlink_inode_operations;
	else
		inode->i_op = &f2fs_symlink_inode_operations;
	inode_nohighmem(inode);
	inode->i_mapping->a_ops = &f2fs_dblock_aops;

	f2fs_balance_fs(sbi, true);

	f2fs_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	if (err)
		goto out;
	f2fs_unlock_op(sbi);
	alloc_nid_done(sbi, inode->i_ino);

	if (f2fs_encrypted_inode(inode)) {
		struct qstr istr = QSTR_INIT(symname, len);
		struct fscrypt_str ostr;

		sd = kzalloc(disk_link.len, GFP_NOFS);
		if (!sd) {
			err = -ENOMEM;
			goto err_out;
		}

		err = fscrypt_get_encryption_info(inode);
		if (err)
			goto err_out;

		if (!fscrypt_has_encryption_key(inode)) {
			err = -EPERM;
			goto err_out;
		}

		ostr.name = sd->encrypted_path;
		ostr.len = disk_link.len;
		err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
		if (err < 0)
			goto err_out;

		sd->len = cpu_to_le16(ostr.len);
		disk_link.name = (char *)sd;
	}

	err = page_symlink(inode, disk_link.name, disk_link.len);

err_out:
	d_instantiate(dentry, inode);
	unlock_new_inode(inode);

	/*
	 * Let's flush symlink data in order to avoid broken symlink as much as
	 * possible. Nevertheless, fsyncing is the best way, but there is no
	 * way to get a file descriptor in order to flush that.
	 *
	 * Note that, it needs to do dir->fsync to make this recoverable.
	 * If the symlink path is stored into inline_data, there is no
	 * performance regression.
	 */
	if (!err) {
		filemap_write_and_wait_range(inode->i_mapping, 0,
							disk_link.len - 1);

		if (IS_DIRSYNC(dir))
			f2fs_sync_fs(sbi->sb, 1);
	} else {
		f2fs_unlink(dir, dentry);
	}

	kfree(sd);
	return err;
out:
	handle_failed_inode(inode);
	return err;
}

static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct inode *inode;
	int err;

	inode = f2fs_new_inode(dir, S_IFDIR | mode);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	inode->i_op = &f2fs_dir_inode_operations;
	inode->i_fop = &f2fs_dir_operations;
	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);

	f2fs_balance_fs(sbi, true);

	set_inode_flag(inode, FI_INC_LINK);
	f2fs_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	if (err)
		goto out_fail;
	f2fs_unlock_op(sbi);

	alloc_nid_done(sbi, inode->i_ino);

	d_instantiate(dentry, inode);
	unlock_new_inode(inode);

	if (IS_DIRSYNC(dir))
		f2fs_sync_fs(sbi->sb, 1);
	return 0;

out_fail:
	clear_inode_flag(inode, FI_INC_LINK);
	handle_failed_inode(inode);
	return err;
}

static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
{
	struct inode *inode = d_inode(dentry);
	if (f2fs_empty_dir(inode))
		return f2fs_unlink(dir, dentry);
	return -ENOTEMPTY;
}

static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
				umode_t mode, dev_t rdev)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct inode *inode;
	int err = 0;

	if (!new_valid_dev(rdev))
		return -EINVAL;

	inode = f2fs_new_inode(dir, mode);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	init_special_inode(inode, inode->i_mode, rdev);
	inode->i_op = &f2fs_special_inode_operations;

	f2fs_balance_fs(sbi, true);

	f2fs_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	if (err)
		goto out;
	f2fs_unlock_op(sbi);

	alloc_nid_done(sbi, inode->i_ino);

	d_instantiate(dentry, inode);
	unlock_new_inode(inode);

	if (IS_DIRSYNC(dir))
		f2fs_sync_fs(sbi->sb, 1);
	return 0;
out:
	handle_failed_inode(inode);
	return err;
}

static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
			struct inode *new_dir, struct dentry *new_dentry)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
	struct inode *old_inode = d_inode(old_dentry);
	struct inode *new_inode = d_inode(new_dentry);
	struct page *old_dir_page;
	struct page *old_page, *new_page;
	struct f2fs_dir_entry *old_dir_entry = NULL;
	struct f2fs_dir_entry *old_entry;
	struct f2fs_dir_entry *new_entry;
	bool is_old_inline = f2fs_has_inline_dentry(old_dir);
	int err = -ENOENT;

	if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
			!fscrypt_has_permitted_context(new_dir, old_inode)) {
		err = -EPERM;
		goto out;
	}

	old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
	if (!old_entry) {
		if (IS_ERR(old_page))
			err = PTR_ERR(old_page);
		goto out;
	}

	if (S_ISDIR(old_inode->i_mode)) {
		old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
		if (!old_dir_entry) {
			if (IS_ERR(old_dir_page))
				err = PTR_ERR(old_dir_page);
			goto out_old;
		}
	}

	if (new_inode) {

		err = -ENOTEMPTY;
		if (old_dir_entry && !f2fs_empty_dir(new_inode))
			goto out_dir;

		err = -ENOENT;
		new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
						&new_page);
		if (!new_entry) {
			if (IS_ERR(new_page))
				err = PTR_ERR(new_page);
			goto out_dir;
		}

		f2fs_balance_fs(sbi, true);

		f2fs_lock_op(sbi);

		err = acquire_orphan_inode(sbi);
		if (err)
			goto put_out_dir;

		err = update_dent_inode(old_inode, new_inode,
						&new_dentry->d_name);
		if (err) {
			release_orphan_inode(sbi);
			goto put_out_dir;
		}

		f2fs_set_link(new_dir, new_entry, new_page, old_inode);

		new_inode->i_ctime = CURRENT_TIME;
		down_write(&F2FS_I(new_inode)->i_sem);
		if (old_dir_entry)
			f2fs_i_links_write(new_inode, false);
		f2fs_i_links_write(new_inode, false);
		up_write(&F2FS_I(new_inode)->i_sem);

		if (!new_inode->i_nlink)
			add_orphan_inode(new_inode);
		else
			release_orphan_inode(sbi);
	} else {
		f2fs_balance_fs(sbi, true);

		f2fs_lock_op(sbi);

		err = f2fs_add_link(new_dentry, old_inode);
		if (err) {
			f2fs_unlock_op(sbi);
			goto out_dir;
		}

		if (old_dir_entry)
			f2fs_i_links_write(new_dir, true);

		/*
		 * old entry and new entry can locate in the same inline
		 * dentry in inode, when attaching new entry in inline dentry,
		 * it could force inline dentry conversion, after that,
		 * old_entry and old_page will point to wrong address, in
		 * order to avoid this, let's do the check and update here.
		 */
		if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
			f2fs_put_page(old_page, 0);
			old_page = NULL;

			old_entry = f2fs_find_entry(old_dir,
						&old_dentry->d_name, &old_page);
			if (!old_entry) {
				err = -ENOENT;
				if (IS_ERR(old_page))
					err = PTR_ERR(old_page);
				f2fs_unlock_op(sbi);
				goto out_dir;
			}
		}
	}

	down_write(&F2FS_I(old_inode)->i_sem);
	file_lost_pino(old_inode);
	if (new_inode && file_enc_name(new_inode))
		file_set_enc_name(old_inode);
	up_write(&F2FS_I(old_inode)->i_sem);

	old_inode->i_ctime = CURRENT_TIME;
	f2fs_mark_inode_dirty_sync(old_inode);

	f2fs_delete_entry(old_entry, old_page, old_dir, NULL);

	if (old_dir_entry) {
		if (old_dir != new_dir) {
			f2fs_set_link(old_inode, old_dir_entry,
						old_dir_page, new_dir);
		} else {
			f2fs_dentry_kunmap(old_inode, old_dir_page);
			f2fs_put_page(old_dir_page, 0);
		}
		f2fs_i_links_write(old_dir, false);
	}

	f2fs_unlock_op(sbi);

	if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
		f2fs_sync_fs(sbi->sb, 1);
	return 0;

put_out_dir:
	f2fs_unlock_op(sbi);
	f2fs_dentry_kunmap(new_dir, new_page);
	f2fs_put_page(new_page, 0);
out_dir:
	if (old_dir_entry) {
		f2fs_dentry_kunmap(old_inode, old_dir_page);
		f2fs_put_page(old_dir_page, 0);
	}
out_old:
	f2fs_dentry_kunmap(old_dir, old_page);
	f2fs_put_page(old_page, 0);
out:
	return err;
}

static void *f2fs_encrypted_follow_link(struct dentry *dentry,
						struct nameidata *nd)
{
	struct page *cpage = NULL;
	char *caddr, *paddr = NULL;
	struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
	struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
	struct fscrypt_symlink_data *sd;
	struct inode *inode = d_inode(dentry);
	loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1);
	u32 max_size = inode->i_sb->s_blocksize;
	int res;

	res = fscrypt_get_encryption_info(inode);
	if (res)
		return ERR_PTR(res);

	cpage = read_mapping_page(inode->i_mapping, 0, NULL);
	if (IS_ERR(cpage))
		return cpage;
	caddr = kmap(cpage);
	caddr[size] = 0;

	/* Symlink is encrypted */
	sd = (struct fscrypt_symlink_data *)caddr;
	cstr.name = sd->encrypted_path;
	cstr.len = le16_to_cpu(sd->len);

	/* this is broken symlink case */
	if (unlikely(cstr.len == 0)) {
		res = -ENOENT;
		goto errout;
	}

	if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
		/* Symlink data on the disk is corrupted */
		res = -EIO;
		goto errout;
	}
	res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
	if (res)
		goto errout;

	res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
	if (res < 0)
		goto errout;

	/* this is broken symlink case */
	if (unlikely(pstr.name[0] == 0)) {
		res = -ENOENT;
		goto errout;
	}

	paddr = pstr.name;

	/* Null-terminate the name */
	paddr[res] = '\0';
	nd_set_link(nd, paddr);

	kunmap(cpage);
	page_cache_release(cpage);
	return NULL;
errout:
	fscrypt_fname_free_buffer(&pstr);
	kunmap(cpage);
	page_cache_release(cpage);
	return ERR_PTR(res);
}

void kfree_put_link(struct dentry *dentry, struct nameidata *nd,
		void *cookie)
{
	char *s = nd_get_link(nd);
	if (!IS_ERR(s))
		kfree(s);
}
예제 #8
0
파일: namei.c 프로젝트: mdamt/linux
static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
			     struct inode *new_dir, struct dentry *new_dentry)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
	struct inode *old_inode = d_inode(old_dentry);
	struct inode *new_inode = d_inode(new_dentry);
	struct page *old_dir_page, *new_dir_page;
	struct page *old_page, *new_page;
	struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
	struct f2fs_dir_entry *old_entry, *new_entry;
	int old_nlink = 0, new_nlink = 0;
	int err = -ENOENT;

	if ((f2fs_encrypted_inode(old_dir) &&
			!fscrypt_has_encryption_key(old_dir)) ||
			(f2fs_encrypted_inode(new_dir) &&
			!fscrypt_has_encryption_key(new_dir)))
		return -ENOKEY;

	if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
			(old_dir != new_dir) &&
			(!fscrypt_has_permitted_context(new_dir, old_inode) ||
			 !fscrypt_has_permitted_context(old_dir, new_inode)))
		return -EPERM;

	err = dquot_initialize(old_dir);
	if (err)
		goto out;

	err = dquot_initialize(new_dir);
	if (err)
		goto out;

	old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
	if (!old_entry) {
		if (IS_ERR(old_page))
			err = PTR_ERR(old_page);
		goto out;
	}

	new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
	if (!new_entry) {
		if (IS_ERR(new_page))
			err = PTR_ERR(new_page);
		goto out_old;
	}

	/* prepare for updating ".." directory entry info later */
	if (old_dir != new_dir) {
		if (S_ISDIR(old_inode->i_mode)) {
			old_dir_entry = f2fs_parent_dir(old_inode,
							&old_dir_page);
			if (!old_dir_entry) {
				if (IS_ERR(old_dir_page))
					err = PTR_ERR(old_dir_page);
				goto out_new;
			}
		}

		if (S_ISDIR(new_inode->i_mode)) {
			new_dir_entry = f2fs_parent_dir(new_inode,
							&new_dir_page);
			if (!new_dir_entry) {
				if (IS_ERR(new_dir_page))
					err = PTR_ERR(new_dir_page);
				goto out_old_dir;
			}
		}
	}

	/*
	 * If cross rename between file and directory those are not
	 * in the same directory, we will inc nlink of file's parent
	 * later, so we should check upper boundary of its nlink.
	 */
	if ((!old_dir_entry || !new_dir_entry) &&
				old_dir_entry != new_dir_entry) {
		old_nlink = old_dir_entry ? -1 : 1;
		new_nlink = -old_nlink;
		err = -EMLINK;
		if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
			(new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
			goto out_new_dir;
	}

	f2fs_balance_fs(sbi, true);

	f2fs_lock_op(sbi);

	/* update ".." directory entry info of old dentry */
	if (old_dir_entry)
		f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);

	/* update ".." directory entry info of new dentry */
	if (new_dir_entry)
		f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);

	/* update directory entry info of old dir inode */
	f2fs_set_link(old_dir, old_entry, old_page, new_inode);

	down_write(&F2FS_I(old_inode)->i_sem);
	file_lost_pino(old_inode);
	up_write(&F2FS_I(old_inode)->i_sem);

	old_dir->i_ctime = current_time(old_dir);
	if (old_nlink) {
		down_write(&F2FS_I(old_dir)->i_sem);
		f2fs_i_links_write(old_dir, old_nlink > 0);
		up_write(&F2FS_I(old_dir)->i_sem);
	}
	f2fs_mark_inode_dirty_sync(old_dir, false);

	/* update directory entry info of new dir inode */
	f2fs_set_link(new_dir, new_entry, new_page, old_inode);

	down_write(&F2FS_I(new_inode)->i_sem);
	file_lost_pino(new_inode);
	up_write(&F2FS_I(new_inode)->i_sem);

	new_dir->i_ctime = current_time(new_dir);
	if (new_nlink) {
		down_write(&F2FS_I(new_dir)->i_sem);
		f2fs_i_links_write(new_dir, new_nlink > 0);
		up_write(&F2FS_I(new_dir)->i_sem);
	}
	f2fs_mark_inode_dirty_sync(new_dir, false);

	f2fs_unlock_op(sbi);

	if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
		f2fs_sync_fs(sbi->sb, 1);
	return 0;
out_new_dir:
	if (new_dir_entry) {
		f2fs_dentry_kunmap(new_inode, new_dir_page);
		f2fs_put_page(new_dir_page, 0);
	}
out_old_dir:
	if (old_dir_entry) {
		f2fs_dentry_kunmap(old_inode, old_dir_page);
		f2fs_put_page(old_dir_page, 0);
	}
out_new:
	f2fs_dentry_kunmap(new_dir, new_page);
	f2fs_put_page(new_page, 0);
out_old:
	f2fs_dentry_kunmap(old_dir, old_page);
	f2fs_put_page(old_page, 0);
out:
	return err;
}
예제 #9
0
파일: namei.c 프로젝트: mdamt/linux
static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
			struct inode *new_dir, struct dentry *new_dentry,
			unsigned int flags)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
	struct inode *old_inode = d_inode(old_dentry);
	struct inode *new_inode = d_inode(new_dentry);
	struct inode *whiteout = NULL;
	struct page *old_dir_page;
	struct page *old_page, *new_page = NULL;
	struct f2fs_dir_entry *old_dir_entry = NULL;
	struct f2fs_dir_entry *old_entry;
	struct f2fs_dir_entry *new_entry;
	bool is_old_inline = f2fs_has_inline_dentry(old_dir);
	int err = -ENOENT;

	if ((f2fs_encrypted_inode(old_dir) &&
			!fscrypt_has_encryption_key(old_dir)) ||
			(f2fs_encrypted_inode(new_dir) &&
			!fscrypt_has_encryption_key(new_dir)))
		return -ENOKEY;

	if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
			!fscrypt_has_permitted_context(new_dir, old_inode)) {
		err = -EPERM;
		goto out;
	}

	err = dquot_initialize(old_dir);
	if (err)
		goto out;

	err = dquot_initialize(new_dir);
	if (err)
		goto out;

	old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
	if (!old_entry) {
		if (IS_ERR(old_page))
			err = PTR_ERR(old_page);
		goto out;
	}

	if (S_ISDIR(old_inode->i_mode)) {
		old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
		if (!old_dir_entry) {
			if (IS_ERR(old_dir_page))
				err = PTR_ERR(old_dir_page);
			goto out_old;
		}
	}

	if (flags & RENAME_WHITEOUT) {
		err = f2fs_create_whiteout(old_dir, &whiteout);
		if (err)
			goto out_dir;
	}

	if (new_inode) {

		err = -ENOTEMPTY;
		if (old_dir_entry && !f2fs_empty_dir(new_inode))
			goto out_whiteout;

		err = -ENOENT;
		new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
						&new_page);
		if (!new_entry) {
			if (IS_ERR(new_page))
				err = PTR_ERR(new_page);
			goto out_whiteout;
		}

		f2fs_balance_fs(sbi, true);

		f2fs_lock_op(sbi);

		err = acquire_orphan_inode(sbi);
		if (err)
			goto put_out_dir;

		f2fs_set_link(new_dir, new_entry, new_page, old_inode);

		new_inode->i_ctime = current_time(new_inode);
		down_write(&F2FS_I(new_inode)->i_sem);
		if (old_dir_entry)
			f2fs_i_links_write(new_inode, false);
		f2fs_i_links_write(new_inode, false);
		up_write(&F2FS_I(new_inode)->i_sem);

		if (!new_inode->i_nlink)
			add_orphan_inode(new_inode);
		else
			release_orphan_inode(sbi);
	} else {
		f2fs_balance_fs(sbi, true);

		f2fs_lock_op(sbi);

		err = f2fs_add_link(new_dentry, old_inode);
		if (err) {
			f2fs_unlock_op(sbi);
			goto out_whiteout;
		}

		if (old_dir_entry)
			f2fs_i_links_write(new_dir, true);

		/*
		 * old entry and new entry can locate in the same inline
		 * dentry in inode, when attaching new entry in inline dentry,
		 * it could force inline dentry conversion, after that,
		 * old_entry and old_page will point to wrong address, in
		 * order to avoid this, let's do the check and update here.
		 */
		if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
			f2fs_put_page(old_page, 0);
			old_page = NULL;

			old_entry = f2fs_find_entry(old_dir,
						&old_dentry->d_name, &old_page);
			if (!old_entry) {
				err = -ENOENT;
				if (IS_ERR(old_page))
					err = PTR_ERR(old_page);
				f2fs_unlock_op(sbi);
				goto out_whiteout;
			}
		}
	}

	down_write(&F2FS_I(old_inode)->i_sem);
	if (!old_dir_entry || whiteout)
		file_lost_pino(old_inode);
	else
		F2FS_I(old_inode)->i_pino = new_dir->i_ino;
	up_write(&F2FS_I(old_inode)->i_sem);

	old_inode->i_ctime = current_time(old_inode);
	f2fs_mark_inode_dirty_sync(old_inode, false);

	f2fs_delete_entry(old_entry, old_page, old_dir, NULL);

	if (whiteout) {
		whiteout->i_state |= I_LINKABLE;
		set_inode_flag(whiteout, FI_INC_LINK);
		err = f2fs_add_link(old_dentry, whiteout);
		if (err)
			goto put_out_dir;
		whiteout->i_state &= ~I_LINKABLE;
		iput(whiteout);
	}

	if (old_dir_entry) {
		if (old_dir != new_dir && !whiteout) {
			f2fs_set_link(old_inode, old_dir_entry,
						old_dir_page, new_dir);
		} else {
			f2fs_dentry_kunmap(old_inode, old_dir_page);
			f2fs_put_page(old_dir_page, 0);
		}
		f2fs_i_links_write(old_dir, false);
	}

	f2fs_unlock_op(sbi);

	if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
		f2fs_sync_fs(sbi->sb, 1);
	return 0;

put_out_dir:
	f2fs_unlock_op(sbi);
	if (new_page) {
		f2fs_dentry_kunmap(new_dir, new_page);
		f2fs_put_page(new_page, 0);
	}
out_whiteout:
	if (whiteout)
		iput(whiteout);
out_dir:
	if (old_dir_entry) {
		f2fs_dentry_kunmap(old_inode, old_dir_page);
		f2fs_put_page(old_dir_page, 0);
	}
out_old:
	f2fs_dentry_kunmap(old_dir, old_page);
	f2fs_put_page(old_page, 0);
out:
	return err;
}
예제 #10
0
파일: namei.c 프로젝트: mdamt/linux
static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
		unsigned int flags)
{
	struct inode *inode = NULL;
	struct f2fs_dir_entry *de;
	struct page *page;
	nid_t ino;
	int err = 0;
	unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));

	if (f2fs_encrypted_inode(dir)) {
		int res = fscrypt_get_encryption_info(dir);

		/*
		 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
		 * created while the directory was encrypted and we
		 * don't have access to the key.
		 */
		if (fscrypt_has_encryption_key(dir))
			fscrypt_set_encrypted_dentry(dentry);
		fscrypt_set_d_op(dentry);
		if (res && res != -ENOKEY)
			return ERR_PTR(res);
	}

	if (dentry->d_name.len > F2FS_NAME_LEN)
		return ERR_PTR(-ENAMETOOLONG);

	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	if (!de) {
		if (IS_ERR(page))
			return (struct dentry *)page;
		return d_splice_alias(inode, dentry);
	}

	ino = le32_to_cpu(de->ino);
	f2fs_dentry_kunmap(dir, page);
	f2fs_put_page(page, 0);

	inode = f2fs_iget(dir->i_sb, ino);
	if (IS_ERR(inode))
		return ERR_CAST(inode);

	if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
		err = __recover_dot_dentries(dir, root_ino);
		if (err)
			goto err_out;
	}

	if (f2fs_has_inline_dots(inode)) {
		err = __recover_dot_dentries(inode, dir->i_ino);
		if (err)
			goto err_out;
	}
	if (f2fs_encrypted_inode(dir) &&
	    (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
	    !fscrypt_has_permitted_context(dir, inode)) {
		f2fs_msg(inode->i_sb, KERN_WARNING,
			 "Inconsistent encryption contexts: %lu/%lu",
			 dir->i_ino, inode->i_ino);
		err = -EPERM;
		goto err_out;
	}
	return d_splice_alias(inode, dentry);

err_out:
	iput(inode);
	return ERR_PTR(err);
}
예제 #11
0
int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
{
	struct inode *inode = file->f_mapping->host;
	struct f2fs_inode_info *fi = F2FS_I(inode);
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
	nid_t ino = inode->i_ino;
	int ret = 0;
	bool need_cp = false;
	struct writeback_control wbc = {
		.sync_mode = WB_SYNC_ALL,
		.nr_to_write = LONG_MAX,
		.for_reclaim = 0,
	};

	if (unlikely(f2fs_readonly(inode->i_sb)))
		return 0;

	trace_f2fs_sync_file_enter(inode);

	/* if fdatasync is triggered, let's do in-place-update */
	if (datasync || get_dirty_pages(inode) <= SM_I(sbi)->min_fsync_blocks)
		set_inode_flag(fi, FI_NEED_IPU);
	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
	clear_inode_flag(fi, FI_NEED_IPU);

	if (ret) {
		trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
		return ret;
	}

	/* if the inode is dirty, let's recover all the time */
	if (!datasync) {
		f2fs_write_inode(inode, NULL);
		goto go_write;
	}

	/*
	 * if there is no written data, don't waste time to write recovery info.
	 */
	if (!is_inode_flag_set(fi, FI_APPEND_WRITE) &&
			!exist_written_data(sbi, ino, APPEND_INO)) {

		/* it may call write_inode just prior to fsync */
		if (need_inode_page_update(sbi, ino))
			goto go_write;

		if (is_inode_flag_set(fi, FI_UPDATE_WRITE) ||
				exist_written_data(sbi, ino, UPDATE_INO))
			goto flush_out;
		goto out;
	}
go_write:
	/*
	 * Both of fdatasync() and fsync() are able to be recovered from
	 * sudden-power-off.
	 */
	down_read(&fi->i_sem);
	need_cp = need_do_checkpoint(inode);
	up_read(&fi->i_sem);

	if (need_cp) {
		/* all the dirty node pages should be flushed for POR */
		ret = f2fs_sync_fs(inode->i_sb, 1);

		/*
		 * We've secured consistency through sync_fs. Following pino
		 * will be used only for fsynced inodes after checkpoint.
		 */
		try_to_fix_pino(inode);
		clear_inode_flag(fi, FI_APPEND_WRITE);
		clear_inode_flag(fi, FI_UPDATE_WRITE);
		goto out;
	}
sync_nodes:
	sync_node_pages(sbi, ino, &wbc);

	/* if cp_error was enabled, we should avoid infinite loop */
	if (unlikely(f2fs_cp_error(sbi))) {
		ret = -EIO;
		goto out;
	}

	if (need_inode_block_update(sbi, ino)) {
		mark_inode_dirty_sync(inode);
		f2fs_write_inode(inode, NULL);
		goto sync_nodes;
	}

	ret = wait_on_node_pages_writeback(sbi, ino);
	if (ret)
		goto out;

	/* once recovery info is written, don't need to tack this */
	remove_ino_entry(sbi, ino, APPEND_INO);
	clear_inode_flag(fi, FI_APPEND_WRITE);
flush_out:
	remove_ino_entry(sbi, ino, UPDATE_INO);
	clear_inode_flag(fi, FI_UPDATE_WRITE);
	ret = f2fs_issue_flush(sbi);
	f2fs_update_time(sbi, REQ_TIME);
out:
	trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
	f2fs_trace_ios(NULL, 1);
	return ret;
}

static pgoff_t __get_first_dirty_index(struct address_space *mapping,
						pgoff_t pgofs, int whence)
{
	struct pagevec pvec;
	int nr_pages;

	if (whence != SEEK_DATA)
		return 0;

	/* find first dirty page index */
	pagevec_init(&pvec, 0);
	nr_pages = pagevec_lookup_tag(&pvec, mapping, &pgofs,
					PAGECACHE_TAG_DIRTY, 1);
	pgofs = nr_pages ? pvec.pages[0]->index : ULONG_MAX;
	pagevec_release(&pvec);
	return pgofs;
}

static bool __found_offset(block_t blkaddr, pgoff_t dirty, pgoff_t pgofs,
							int whence)
{
	switch (whence) {
	case SEEK_DATA:
		if ((blkaddr == NEW_ADDR && dirty == pgofs) ||
			(blkaddr != NEW_ADDR && blkaddr != NULL_ADDR))
			return true;
		break;
	case SEEK_HOLE:
		if (blkaddr == NULL_ADDR)
			return true;
		break;
	}
	return false;
}

static loff_t f2fs_seek_block(struct file *file, loff_t offset, int whence)
{
	struct inode *inode = file->f_mapping->host;
	loff_t maxbytes = inode->i_sb->s_maxbytes;
	struct dnode_of_data dn;
	pgoff_t pgofs, end_offset, dirty;
	loff_t data_ofs = offset;
	loff_t isize;
	int err = 0;

	inode_lock(inode);

	isize = i_size_read(inode);
	if (offset >= isize)
		goto fail;

	/* handle inline data case */
	if (f2fs_has_inline_data(inode) || f2fs_has_inline_dentry(inode)) {
		if (whence == SEEK_HOLE)
			data_ofs = isize;
		goto found;
	}

	pgofs = (pgoff_t)(offset >> PAGE_CACHE_SHIFT);

	dirty = __get_first_dirty_index(inode->i_mapping, pgofs, whence);

	for (; data_ofs < isize; data_ofs = (loff_t)pgofs << PAGE_CACHE_SHIFT) {
		set_new_dnode(&dn, inode, NULL, NULL, 0);
		err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE_RA);
		if (err && err != -ENOENT) {
			goto fail;
		} else if (err == -ENOENT) {
			/* direct node does not exists */
			if (whence == SEEK_DATA) {
				pgofs = get_next_page_offset(&dn, pgofs);
				continue;
			} else {
				goto found;
			}
		}

		end_offset = ADDRS_PER_PAGE(dn.node_page, inode);

		/* find data/hole in dnode block */
		for (; dn.ofs_in_node < end_offset;
				dn.ofs_in_node++, pgofs++,
				data_ofs = (loff_t)pgofs << PAGE_CACHE_SHIFT) {
			block_t blkaddr;
			blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node);

			if (__found_offset(blkaddr, dirty, pgofs, whence)) {
				f2fs_put_dnode(&dn);
				goto found;
			}
		}
		f2fs_put_dnode(&dn);
	}

	if (whence == SEEK_DATA)
		goto fail;
found:
	if (whence == SEEK_HOLE && data_ofs > isize)
		data_ofs = isize;
	inode_unlock(inode);
	return vfs_setpos(file, data_ofs, maxbytes);
fail:
	inode_unlock(inode);
	return -ENXIO;
}

static loff_t f2fs_llseek(struct file *file, loff_t offset, int whence)
{
	struct inode *inode = file->f_mapping->host;
	loff_t maxbytes = inode->i_sb->s_maxbytes;

	switch (whence) {
	case SEEK_SET:
	case SEEK_CUR:
	case SEEK_END:
		return generic_file_llseek_size(file, offset, whence,
						maxbytes, i_size_read(inode));
	case SEEK_DATA:
	case SEEK_HOLE:
		if (offset < 0)
			return -ENXIO;
		return f2fs_seek_block(file, offset, whence);
	}

	return -EINVAL;
}

static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct inode *inode = file_inode(file);
	int err;

	if (f2fs_encrypted_inode(inode)) {
		err = fscrypt_get_encryption_info(inode);
		if (err)
			return 0;
		if (!f2fs_encrypted_inode(inode))
			return -ENOKEY;
	}

	/* we don't need to use inline_data strictly */
	err = f2fs_convert_inline_inode(inode);
	if (err)
		return err;

	file_accessed(file);
	vma->vm_ops = &f2fs_file_vm_ops;
	return 0;
}

static int f2fs_file_open(struct inode *inode, struct file *filp)
{
	int ret = generic_file_open(inode, filp);
	struct inode *dir = filp->f_path.dentry->d_parent->d_inode;

	if (!ret && f2fs_encrypted_inode(inode)) {
		ret = fscrypt_get_encryption_info(inode);
		if (ret)
			return -EACCES;
		if (!fscrypt_has_encryption_key(inode))
			return -ENOKEY;
	}
	if (f2fs_encrypted_inode(dir) &&
			!fscrypt_has_permitted_context(dir, inode))
		return -EPERM;
	return ret;
}